JP4300712B2 - refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator and a refrigeration air conditioner including a plurality of evaporators and a compressor having a compression element.
[0002]
[Prior art]
Since the ratio of the refrigerator to the household electricity bill is large, reducing the power consumption of the refrigerator is an important issue in order to reduce the household electricity bill. As a technique for solving this problem, there is a refrigerator having two evaporators and two compression elements having different evaporation temperatures and having outlets of the two evaporators connected to the suction passages of the two compression elements, respectively. It is considered. An example of such a prior art is disclosed in Japanese Patent Laid-Open No. 5-223368.
[0003]
The refrigerator disclosed in the above prior art is connected to a freezer compartment evaporator that cools the freezer compartment and a refrigerator compartment evaporator that cools the refrigerator compartment in parallel with different evaporation temperatures. It has elements. The suction passage of the low-stage compression element is connected to the freezer compartment evaporator outlet, and the discharge passage of the low-stage compression element is joined to the refrigerator compartment evaporator outlet and is connected to the suction passage of the high-stage compression element, so that the high-stage compression is performed. The discharge passage of the element is connected to the condenser inlet.
[0004]
The low-stage compression element compresses the gas refrigerant flowing out of the freezer evaporator from a low pressure at the evaporation pressure level of the freezer evaporator to an intermediate pressure at the evaporation pressure level of the freezer evaporator, The gas refrigerant compressed to the intermediate pressure by the low-stage compression element and the gas refrigerant flowing out of the refrigerator compartment evaporator are both compressed from the intermediate pressure to a high pressure at the condensation pressure level of the condenser.
[0005]
In such a conventional technique, the gas refrigerant flowing out of the refrigerating room evaporator having a higher evaporation temperature as compared with the freezing room evaporator is compressed from an intermediate pressure instead of being decompressed and compressed from a low pressure. It is trying to reduce the power consumption of the refrigerator by reducing the compression power of the low-stage compression.
[0006]
In addition, as described above, a refrigerator having an evaporator in each of the freezer compartment and the refrigerator compartment has a single evaporator, and a refrigerator compartment as compared with a refrigerator that cools both the refrigerator compartment and the refrigerator compartment by forced circulation of cold air. Since the evaporation temperature of the evaporator can be increased, the discharge cold air temperature to the refrigerator compartment can be increased and the humidity can be kept high.
[0007]
[Problems to be solved by the invention]
In general, the freezer temperature of a refrigerator is −18 ° C. or lower, while the refrigerator temperature is required to be 5 ° C. or lower higher than 0 ° C. In the prior art disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 5-223368, the freezing room and the refrigerating room are simultaneously cooled using two compression elements and two evaporators having different evaporation temperatures. The structure which aims at reduction of this is shown.
[0008]
However, in the operation of cooling the freezing room and the refrigerating room in parallel according to the above-described prior art, the freezing room is cooled when the freezing room temperature is equal to or higher than the predetermined temperature even when the freezing room temperature is lower than the predetermined temperature. However, no consideration was given to the point of being adversely affected by the storage in the refrigerator compartment. In order to solve such a problem, if an electric heater for warming the refrigerator compartment is provided so that the food in the refrigerator compartment is not frozen, there is a problem that the power consumption is increased.
[0009]
In order to solve these problems, it is necessary to cool each chamber independently. However, the structure of the compressor and the refrigeration cycle for achieving such a function is considered in this prior art. It wasn't. In particular, the configuration of a refrigerator that is operated efficiently when switching between an operation that cools each chamber independently and an operation that operates simultaneously with each chamber has not been considered in the prior art.
[0010]
An object of the present invention is to provide a refrigerator or a refrigeration air conditioner that includes a cooler that individually cools a plurality of storage rooms and efficiently cools the interior of the storage.
[0011]
[Means for Solving the Problems]
  The above purpose is
  A first cooler for cooling the first storage chamber, a second cooler for cooling the second storage chamber, a compressor having first and second compression elements, and a condenser are connected. In a refrigerator equipped with a freezing cycle,
  A refrigerant pipe connected to a discharge passage from the first compression element and an inlet of the condenser;
  A refrigerant pipe connected to the outlet of the condenser and the first cooler and the second cooler;
  A first suction passage connected to the first cooler and the first compression element;
  A second suction passage connected to the second cooler and the second compression element;
  First valve means provided in a passage connected to the first and second suction passages to stop the flow of refrigerant from the first suction passage to the second suction passage;
  Provided in a passage connected to a discharge passage from the first compression element and a discharge passage from the second compression element, and from a discharge passage of the first compression element to a discharge passage of the second compression element Second valve means for stopping the flow of the refrigerant;
  A connection passage between the discharge passage from the second compression element and the first suction passage;
  Adjusting means for adjusting the flow of refrigerant through the first cooler and the first suction passage and the flow of refrigerant flowing from the second compression element to the first compression element;
  The adjusting means is
  A branch portion provided on a refrigerant pipe connecting the condenser and the first and second coolers and branching the refrigerant pipe to the first and second coolers;
  First adjusting means provided on a refrigerant pipe between the branch portion and the first cooler for adjusting the flow of the refrigerant in the pipe;
  A second adjusting means provided on a connecting passage between the discharge passage from the second compression element and the first suction passage, for adjusting the flow of the refrigerant in the passage;
  Control means for adjusting the first and second adjusting means;
With
  A heat exchanger provided on a connection passage between the second adjustment means and the first suction passage.
Is achieved.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[Example 1]
FIG. 1 is a cycle configuration diagram showing an outline of a refrigeration cycle of a refrigerator according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view schematically showing a refrigerator using the refrigeration cycle of the embodiment shown in FIG. FIG. 3 is a longitudinal sectional view showing the internal structure of the compressor provided in the refrigeration cycle of the embodiment shown in FIG. FIG. 4 is a perspective view showing the structure of the second cylinder, the partition plate, the first cylinder, the auxiliary bearing, and the first discharge chamber cover, which are the compressor parts shown in FIG. FIG. 5 is a perspective view showing a valve that is a compressor component shown in FIG. 3. FIG. 6 is a perspective view showing the structure of the main bearing, the second discharge chamber sub-cover, and the second discharge chamber main cover, which are the compressor parts shown in FIG. FIG. 7 is a view showing a second cylinder portion of the compressor shown in FIG. FIG. 8 is a graph showing the difference between the pressure in the compression chamber during one rotation and the pressure in the sealed container when the compressor of the embodiment shown in FIG. 3 performs two-stage compression. FIG. 9 is a graph showing the difference between the compression chamber pressure during one rotation and the pressure in the sealed container when the compressor of the embodiment shown in FIG. 3 performs single-stage compression. FIG. 10 is a flowchart showing an operation control flow of the refrigerator of the embodiment shown in FIG.
[0023]
  In FIG. 1, reference numeral 10 denotes a compressor, and reference numeral 40 denotes an airtight container. The airtight container 40 has two compression elements (a low-stage compression element 11 and a high-stage compression element 12). In the present embodiment, as will be described later, when these two compression elements are connected in series, the refrigerant flowing through the refrigeration cycle passes through these compression elements in turn and is spread twice by each compression element. Compressed. In addition, when two compression elements are connected in parallel, the refrigerant flowing through the cycle is condensed.vesselAfter passing through the evaporator, it is divided into individual compression elements and flows in parallel (simultaneously in parallel). After being compressed once by each compression element, it is discharged and merged and flows along the refrigerant passage. That is, it flows into the low-stage compression element 11 and also flows into the high-stage compression element 12 separately.
[0024]
Further, in this embodiment, the displacement amounts of the low-stage compression element 11 and the high-stage compression element 12 are set to be equal or almost equal.
[0025]
11a and 11b are a suction passage and a discharge passage of the low-stage compression element 11, respectively, and 12a and 12b are a suction passage and a discharge passage of the high-stage compression element 12, respectively. Reference numeral 12 c denotes a sealed container pressure forming passage that communicates the suction passage 12 a of the high-stage compression element 12 with the sealed container 40.
[0026]
13 a is a suction side check valve, which is disposed in the sealed container 40 and between the suction passage 11 a of the low-stage compression element 11 and the suction passage 12 a of the high-stage compression element 12. When the gas refrigerant pressure in the suction passage 12a of the high-stage compression element 12 is higher than the gas refrigerant pressure in the suction passage 11a of the low-stage compression element 11, the valve is closed and the suction passage 12a of the high-stage compression element 12 is closed. Is lower than the gas refrigerant pressure in the suction passage 11 a of the low-stage compression element 11, the valve is opened, and the gas refrigerant on the suction passage 11 a side of the low-stage compression element 11 is in the high-stage compression element 12. It flows into the suction passage 12a side.
[0027]
Reference numeral 13b denotes a discharge-side check valve, which is disposed in the sealed container 40 and between the discharge passage 11b of the low-stage compression element 11 and the discharge passage 12b of the high-stage compression element 12. When the gas refrigerant pressure in the discharge passage 12b of the high-stage compression element 12 is higher than the gas refrigerant pressure in the discharge passage 11b of the low-stage compression element 11, the valve is closed, and the discharge passage 12b of the high-stage compression element 12 Is lower than the gas refrigerant pressure in the discharge passage 11 b of the low-stage compression element 11, the valve is opened, and the gas refrigerant on the discharge passage 11 b side of the low-stage compression element 11 is in the high-stage compression element 12. It flows into the discharge passage 12b side.
[0028]
The refrigerant discharge passage 12 b of the high-stage compression element 12 is connected to the inlet of the condenser 20. Further, the refrigerant pipe connected to the outlet of the condenser 20 is branched into two, one of which is a first capillary 21 as a decompression device, a freezer compartment evaporator 22, and a suction passage 11a of the low-stage compression element 11. Connected sequentially. The other branched refrigerant pipe is sequentially connected to the first electromagnetic valve 23, the second capillary 24 as a pressure reducing device, the refrigerator 25 evaporator, and the suction passage 12a of the high-stage compression element 12.
[0029]
The electromagnetic valve 23 is a valve that opens and closes when a voltage is applied to adjust the flow of refrigerant in the refrigerant pipe. When the voltage is not energized, the refrigerant flows to the refrigerator compartment evaporator 25 in an open state, and when energized, the refrigerant flows to the refrigerator compartment evaporator 25 in a closed state.
[0030]
The first capillary 21 is disposed in contact with the outlet of the freezer compartment evaporator 22 and the suction passage 11a of the low-stage compression element 11 so as to allow heat exchange. The second capillary 24 is disposed so as to be capable of heat exchange between the outlet of the refrigerating chamber evaporator 25 and the suction passage 12a of the high-stage compression element 12. Thereby, since the refrigerant | coolant of the capillaries 21 and 24 is cooled, pressure-reducing, the inlet enthalpy of each evaporator 22 and 25 falls, and the freezing effect of an evaporator can be increased. On the other hand, since the refrigerant between the outlets of the evaporators 22 and 25 and the suction passages 11a and 12a is heated, it is possible to prevent dew from the piping.
[0031]
26 is a second solenoid valve, 27 is an intermediate cooler, and the discharge passage 11b of the low-stage compression element 11 and the suction passage 12a of the high-stage compression element 12 are connected via the solenoid valve 26 and the intermediate cooler 27. .
[0032]
The second solenoid valve 26 opens and closes the valve by applying a voltage in the same manner as the first solenoid valve 23, and is opened when not energized, and is opened from the discharge passage 11 b of the low-stage compression element 11. Gas refrigerant flow from the discharge passage 11b of the low-stage compression element 11 to the suction passage 12a of the high-stage compression element 12 while allowing the flow of gas refrigerant to the suction passage 12a of the compression element 12 to pass and closed when energized To prevent.
[0033]
The intercooler 27 exchanges heat between the gas refrigerant in the discharge passage 11b of the low-stage compression element 11 and the air to cool the gas refrigerant.
[0034]
30 is a condenser fan, 31 is a freezer compartment evaporator fan, and 32 is a refrigerator compartment evaporator fan.
[0035]
In FIG. 2, the cross-sectional schematic of the refrigerator using the refrigerating cycle of FIG. 1 is shown. The same parts as those in FIG. 1 is a refrigerator main body, 2 is a freezer compartment, 3 is a refrigerator compartment, 4 is an air path formation plate of the evaporator 22 for freezer compartments, 5 is an air path formation plate of the evaporator 25 for refrigerator compartments. 6 is an electric heater for defrosting of the evaporator 22 for freezer compartment, 7 is an electric heater for defrosting of the evaporator 25 for refrigerator compartment, and energization and de-energization are performed at predetermined intervals, respectively. Do frost. 8 is a temperature sensor that detects the temperature in the freezer compartment 2, and 9 is a temperature sensor that detects the temperature in the refrigerator compartment 3. The arrows in the freezer compartment 2 and the refrigerator compartment 3 indicate the direction of airflow.
[0036]
The compressor 10, the condenser 20, the electromagnetic valves 23 and 26, the intercooler 27, and the condenser fan 30 are disposed at the bottom of the refrigerator body 1, and the capillaries 21 and 24 are disposed in the rear heat insulating material of the refrigerator body 1 ( Not shown).
[0037]
The temperature is detected by the temperature sensors 8 and 9, and these outputs are input to the control device 101 of the refrigerator. In the control apparatus 101, the necessity of the cooling operation of the storage chambers 2 and 3 is determined and determined based on the outputs of the temperature sensors 8 and 9. The rotation speeds of the compressor 10 and the fan 30 of the machine room and the fans 31 and 32 of the respective storage rooms are set, and a command is given to the inverters 102, 103, 104, and 105 to adjust these rotation speeds. At the same time, an opening / closing operation command is given to the electromagnetic valves 23 and 26.
[0038]
In addition, when the control device 101 detects a user command from a switch or button 106 provided in the refrigerator 1, the inverters 102 to 105, the electromagnetic valve 23, The operation of the refrigerator may be forcibly set by giving a command to 26. Such operation is appropriate when the user wants to perform cooling and freezing in a short time. When the user commands freezing in a short time, in order to increase the cooling capacity of the freezer compartment, the supply of the refrigerant to the evaporator 25 for the refrigerator compartment is stopped, and the refrigerant is supplied only to the evaporator 22 for the freezer compartment. The solenoid valves 23 and 26 are set so that the refrigerant flows in parallel to the two compression elements 11 and 12. In this embodiment, the electromagnetic valves 23 and 26 are closed.
[0039]
On the other hand, when such a short-time cooling operation is not required, for example, when the difference between the temperature in the freezer compartment and the set temperature is small, the freezer compartment is cooled alone in order to operate more efficiently. Even in this case, the electromagnetic valves 23 and 26 may be set so as to achieve two-stage compression in which the refrigerant sequentially flows through the compression elements 11 and 12. In this embodiment, the electromagnetic valve 23 is closed and the electromagnetic valve 26 is opened. However, when this operation is performed, in the present embodiment, the displacement amounts of the compression elements 11 and 12 are substantially the same, and therefore, the compression element 11 on the lower stage side hardly performs compression work, so the compressor by two-stage compression is used. The improvement in efficiency cannot be expected. Therefore, in order to improve the efficiency when the cooling operation is performed in each chamber alone, the displacement amount of the compression elements 11 and 12 may be varied to reduce the volume of the compression element 12.
[0040]
FIG. 3 is a longitudinal sectional view of the compressor 10 of FIG. The compressor 10 is a two-cylinder rotary compressor, and an electric motor part and a compression mechanism part are housed in a sealed container 40.
[0041]
The electric motor part is composed of a stator 41 fixed to the sealed container 40 by shrink fitting or the like and a rotor 43 fixed to the crankshaft 42.
[0042]
The compression mechanism section has two compression elements corresponding to the low-stage compression element 11 and the high-stage compression element 12 of FIG. The high-stage compression element is composed of a roller 52 (a roller 52 (which includes a main bearing 44 supporting the crankshaft 42, a second cylinder 45, a partition plate 46, a roller portion 52a and a vane portion 52b inserted into the eccentric portion 42a of the crankshaft 42). 7), and sliding members 54a and 54b (see FIG. 7 below) that sandwich the vane portion 52b that enables reciprocating motion and swinging motion of the vane portion 52b. The low-stage compression element includes the partition plate 46, the first cylinder 47, the auxiliary bearing 48 that supports the crankshaft 42, and a roller portion and a vane portion (not shown) inserted into the eccentric portion 42b of the crankshaft 42. And a sliding member (not shown) that sandwiches the vane portion that enables reciprocating motion and swinging motion of the vane portion of the roller 53. The main bearing 44 is fixed to the sealed container 40 by welding or the like.
[0043]
The two eccentric portions 42a and 42b of the crankshaft 42 are formed with a phase difference of 180 ° in the rotation direction, and the rollers 52 and 53 are respectively rotated by the cylinders 45 and 47 as the crankshaft 42 rotates. It is designed to move eccentrically inside. The vanes of the rollers 52 and 53 serve to divide the cylinders 45 and 47 into suction chambers and compression chambers. As the crankshaft 42 rotates, the gas refrigerant is alternately compressed at intervals of 180 ° in the two compression elements.
[0044]
11a ′ is a low-stage compression element suction pipe that partially forms the suction passage 11a of the low-stage compression element 11 of FIG. 1, and 11b ′ is a low-stage compression that partially forms the discharge passage 11b of the low-stage compression element 11 of FIG. The element discharge pipe, 12a ′ is a high-stage compression element suction pipe that partially constitutes the suction passage 12a of the high-stage compression element 12 in FIG. This is a high-stage compression element discharge pipe.
[0045]
Reference numeral 49 denotes a first discharge chamber cover that forms a first discharge chamber together with the sub-bearing 48, and 50 and 51 denote second discharge chamber sub-covers that form a first discharge chamber together with the main bearing 44, respectively. It is a room owner cover.
[0046]
4 (a), (b), (c), (d), and (e) respectively show a second cylinder 45, a partition plate 46, and a first plate that are parts of the compressor 10 shown in FIG. It is the perspective view which looked at the cylinder 47, the sub bearing 48, and the 1st discharge chamber cover 49 from the opposite side to an electric motor part.
[0047]
In the second cylinder 45 shown in FIG. 4 (a), sliding members 54a and 54b sandwiching the vane portion of the roller 51 are incorporated in one space of the gourd-shaped space 45m, and the other space includes the vane portion and the cylinder. This is a space for preventing interference (see FIG. 7 described later). 45e is a hole that partially forms a passage connecting the suction passage 11a of the low-stage compression element 11 of FIG. 1 and the suction-side check valve 13a, and 45f is a discharge side reverse of the discharge passage 11b of the low-stage compression element 11 of FIG. A hole 45g partially forming a passage connecting the stop valve 13b is a recess and a notch partially forming the suction passage 12a of the high-stage compression element 12 of FIG.
[0048]
45u is two holes for fixing the cylinder 45 to the main bearing 44 with bolts, 45v is a partition plate 46, and two female screws for fixing the first cylinder 47 to the second cylinder 45 with bolts The holes 45w are four holes for fastening to the main bearing 44 together with the partition plate 46, the first cylinder 47, the auxiliary bearing 48, and the first discharge chamber cover 49 with bolts.
[0049]
In the partition plate 46 shown in FIG. 4B, 46e is a hole that partially forms a passage connecting the suction passage 11a of the low-stage compression element 11 and the suction-side check valve 13a of FIG. A hole forming part of a passage connecting the discharge passage 11b of the stage compression element 11 and the discharge side check valve 13b, 46g is a hole forming part of the suction passage 12a of the high stage compression element 12 of FIG.
[0050]
46 v is two holes for fixing to the second cylinder 45 together with the first cylinder 47, 46 w is the second cylinder 45, the first cylinder 47, the auxiliary bearing 48, the first discharge chamber. Four holes for fastening the main bearing 44 together with the cover 49 with bolts.
[0051]
In the first cylinder 47 shown in FIG. 4 (c), 47m is equivalent to 45m in FIG. 4 (a). 47e is a notch that partially forms the suction passage 11a of the low-stage compression element 11 of FIG. 1, and 47f is a portion of the passage that connects the discharge passage 11b and the discharge-side check valve 13b of the low-stage compression element 11 of FIG. The hole 47g is a hole that partially forms the suction passage 12a of the high-stage compression element 12 of FIG.
[0052]
47v is two holes for fixing to the second cylinder 45 together with the partition plate 46, 47w is the second cylinder 45, the partition plate 46, the first cylinder 47, the auxiliary bearing 48, the first discharge chamber. Four holes for fastening the main bearing 44 together with the cover 49 with bolts.
[0053]
In the auxiliary bearing 48 shown in FIG. 4D, 48e is a hole that partially forms the suction passage 11a of the low-stage compression element 11 of FIG. 1, and 48t is a valve seat for the low-stage compression element discharge valve. 48d is a discharge hole, 48d 'is a female screw hole for fixing the reed valve 61 shown in FIG. 5A and the valve retainer 62 shown in FIG. Here, the reed valve 61 functions as a discharge valve. 48f is a concave part that partially constitutes the discharge passage 11b of the low-stage compression element 11 of FIG. 1 together with the first discharge chamber cover 49, and forms a discharge chamber, which functions as a silencer by changing the flow passage cross-sectional area. 48f 'is a hole that partially forms a passage connecting the discharge passage 11b of the low-stage compression element 11 of FIG. 1 and the discharge-side check valve 13b, and 48g is a part of the suction passage 12a of the high-stage compression element 12 of FIG. It is a hole to be formed.
[0054]
48w is a hole for fastening four bolts. Reference numeral 48k denotes an oil supply hole for supplying lubricating oil to the crankshaft 42 by an oil supply pump that uses the reciprocating motion of the vane portion of the roller 53 or the like.
[0055]
In the first discharge chamber cover 49 shown in FIG. 4 (e), 49e is a hole that partially forms the suction passage 11a of the low-stage compression element 11 of FIG. 1, and the low-stage compression element suction pipe 11a ′ of FIG. 49f is a hole that partially forms the discharge passage 11b of the low-stage compression element 11 of FIG. 1, and is connected to the low-stage compression element discharge pipe 11b 'of FIG. 3, and 49g is the high-stage compression element 12 of FIG. 3 is partially connected to the high-stage compression element suction pipe 12a ′ of FIG. 49w is a hole for fastening four bolts. Reference numeral 60 denotes an oil supply passage.
[0056]
6 (a), 6 (b), and 6 (c) respectively show a main bearing 44, a second discharge chamber sub cover 50, and a second discharge chamber main cover 51 that are parts of the compressor 10 shown in FIG. It is the perspective view which looked at from the electric motor part side.
[0057]
In the main bearing 44 shown in FIG. 6 (a), 44t is a recess for forming a valve seat or the like of the high-stage compression element discharge valve, 44d is a discharge hole, and 44d 'is shown in FIG. 5 (a). The reed valve 61 is a female screw hole for fixing the valve retainer 62 shown in FIG. 5B to the main bearing 44 with a bolt. Here, the reed valve 61 functions as a discharge valve.
[0058]
44t ′ is a recess for forming the valve seat of the suction side check valve 13a shown in FIG. 1, 44e is a hole of the check valve, 44e ′ is a reed valve 61 shown in FIG. This is a female screw hole for fixing the valve retainer 62 shown in FIG. 5B to the main bearing 44 with a bolt. The reed valve 61 here functions as a check valve. That is, when the gas refrigerant pressure in the space of the recess 44t ′ is higher than the gas refrigerant pressure in the hole 44e, the reed valve is in close contact with the valve seat, the valve is closed, and the gas refrigerant pressure in the space of the recess 44t ′ is When the pressure is lower than the gas refrigerant pressure in the hole 44e, the reed valve floats from the valve seat and the valve is opened.
[0059]
44g is a hole that partially forms a passage connecting the suction passage 12a of the high-stage compression element 12 of FIG. 1 and the suction-side check valve 13a. Reference numeral 44g 'denotes a recess, which together with the second discharge chamber cover 50, forms a flow path that communicates the hole 44g and the recess 44t' constituting the check valve.
[0060]
44t ″ is a recess for forming the valve seat of the discharge side check valve 13b shown in FIG. 1, 44f is a hole of the check valve, 44f ′ is a reed valve 61 shown in FIG. 5 (a). 5B is a female screw hole for fixing the valve retainer 62 shown in FIG. 5B to the main bearing 44 with a bolt. The reed valve 61 here functions as a check valve. That is, when the gas refrigerant pressure in the space of the recess 44t ″ is higher than the gas refrigerant pressure in the hole 44f, the reed valve is in close contact with the valve seat, the valve is closed, and the gas refrigerant in the space of the recess 44t ″. When the pressure is lower than the gas refrigerant pressure in the hole 44f, the reed valve is lifted from the valve seat and the valve is opened.
[0061]
44h partially forms the discharge passage 11b of the high-stage compression element 12 shown in FIG. 1, and the hole on the back side in the figure is connected to the high-stage compression element discharge pipe 12b 'of FIG.
[0062]
Reference numeral 44u denotes two female screw holes for fixing the second cylinder 45 shown in FIG. 4 to the rear side of the figure with bolts. 44w is four female screw holes, and the second cylinder 45, partition plate 46, first cylinder 47, auxiliary bearing 48, and first discharge chamber cover 49 shown in FIG. Two of them are also used to fix the second discharge chamber sub cover 50 and the second discharge chamber main cover 51 on the front side of the figure.
[0063]
In the second discharge chamber sub-cover 50 shown in FIG. 6 (b), 50c is a hole that partially forms the sealed container internal pressure forming passage 12c of FIG. 1, and the recesses 44t ′ and 44g ′ of the main bearing 44 and 44g ′ Communicate. 50h is a convex part that partially forms the discharge passage 12b of the high-stage compression element 12 of FIG. 1 together with the main bearing 44 to form a discharge chamber. This is a hole communicating with another discharge chamber space constituted by the second discharge chamber main cover 51. 50h '' forms a passage connecting the discharge passage 12b of the high-stage compression element 12 of FIG. 1 and the discharge-side check valve 13b, and 50h '' 'denotes the second discharge chamber sub-cover 50 and a second later-described second cover 50. This is a hole that communicates the space constituted by the discharge chamber main cover 51 and the hole 44 h of the main bearing 44 described above.
[0064]
Reference numeral 50w denotes two holes for fixing to the main bearing 44 together with the second discharge chamber main cover 51 with bolts.
[0065]
In the second discharge chamber main cover 51 shown in FIG. 6 (c), 51c is a convex portion, together with the second discharge chamber cover 50, forming a closed container pressure forming passage 12c in FIG. It communicates with the inside of the sealed container 40 of FIG. 51 h is a convex portion that forms a space together with the second discharge chamber sub-cover 50, and the cross-sectional area of the flow path connecting the hole 50 h ′ and the hole 50 h ′ ″ of the second discharge chamber sub-cover 50 changes. To act as a silencer.
[0066]
Reference numeral 51w denotes two holes for fixing to the main bearing 44 together with the second discharge chamber sub cover 50 with bolts.
[0067]
The configuration of the gas refrigerant passage of the compressor 10 shown in FIG. 3 is summarized as follows. The suction passage 11a of the low-stage compression element 11 in FIG. 1 is composed of a low-stage compression element suction pipe 11a ′, a hole 49e, a hole 48e, and a notch 47e. The suction passage 11a and the suction-side check valve 13a in FIG. The connecting passage is composed of a hole 46e, a hole 45e, and a hole 44e. The discharge passage 11b in FIG. 1 includes a recess 48t, a recess 48f (a space formed together with the first discharge chamber cover 49), a hole 49f, and a lower stage. The passage that includes the compression element discharge pipe 11b ′ and connects the discharge passage 11b and the discharge-side check valve 13b in FIG. 1 includes a hole 48f ′, a hole 47f, a hole 46f, a hole 45f, and a hole 44f.
[0068]
Further, the suction passage 12a of the high-stage compression element 12 in FIG. 1 includes a high-stage compression element suction pipe 12a ′, a hole 49g, a hole 48g, a hole 47g, a hole 46g, a recess, and a notch 45g. The passage connecting the side check valve 13a and the suction passage 12a is formed with a recess 44t ′ (a space formed with the second discharge chamber sub-cover 50) and a recess 44g ′ (with the second discharge chamber sub-cover 50). 1), the discharge passage 12b in FIG. 1 includes a recess 44t (a space formed with the second discharge chamber sub-cover 50), a protrusion 50h (a space formed with the main bearing 44), a hole 50h ′, a convex portion 51h (a space formed together with the second discharge chamber sub cover 50), a hole 50h ′ ″, a hole 44h, and a high-stage compression element discharge pipe 12b ′. Valve 13b and discharge passage Passage connecting the 12b, the recess 44t '', the hole 50h 'comprised'. 1 is composed of a hole 50c, a convex portion 51c (a space formed together with the second discharge chamber sub cover 50), and a hole 51c ′, and is sealed with the suction passage of the high-stage compression element. The containers communicate with each other and serve to keep the pressure in the sealed container 40 at the suction gas pressure of the high-stage compression element.
[0069]
FIG. 7 shows a second cylinder portion of the compressor 10 shown in FIG. In the figure, 44z is an end surface portion of the main bearing 44 that constitutes an end surface of the high-stage compression element, and 63 is an oil pocket (concave portion) provided in the end surface portion 44. The inside of the roller 52 and the working chamber are alternately arranged. go and come. Inside the roller 52, the lubricating oil supplied to the crankshaft 42 by the oil supply pump using the reciprocating motion of the vane portion of the roller 53 described above is stored, and the oil pocket 63 operates the high-stage compression element. Oil is supplied to the chamber intermittently. The low-stage compression element is also provided with a similar oil pocket (not shown) at the end face portion of the auxiliary bearing 48, and oil is intermittently supplied to the working chamber of the low-stage compression element.
[0070]
In the refrigerator configured as described above, an operation in which the refrigerator compartment 3 and the freezer compartment 2 are cooled in parallel (simultaneously) and an operation in which the freezer compartment is independently cooled are performed. The operation of simultaneous (parallel) cooling of the freezer compartment and the refrigerator compartment and the operation of the cooling operation of the freezer compartment alone will be described below.
[0071]
At the time of the simultaneous cooling operation of the freezer compartment and the refrigerator compartment, both the first solenoid valve 23 and the second solenoid valve 26 are opened. The low-stage compression element 11, the intermediate cooler 27, the high-stage compression element 12, the condenser 20, the first capillary 21, and the freezer compartment evaporator 22 of the compressor 10 form a freezer compartment cooling and refrigeration cycle and are compressed. The high-stage compression element 12, the condenser 20, the second capillary 24, and the refrigerating room evaporator 25 of the machine 10 form a refrigerating room cooling and refrigeration cycle. The compressor 10 performs two-stage compression in which a low-stage compression element 11 and a high-stage compression element 12 are connected in series. Further, the condenser fan 30, the freezer compartment evaporator 31 and the refrigerating compartment evaporator fan 32 are operated. At this time, in the suction side check valve 13a, the gas refrigerant pressure in the suction passage 12a of the high-stage compression element 12 is higher than the gas refrigerant pressure in the suction passage 11a of the low-stage compression element 11, so that the valve Closed. In the discharge-side check valve 13b, the gas refrigerant pressure in the discharge passage 12b of the high-stage compression element 12 is higher than the gas refrigerant pressure in the discharge passage 11b of the low-stage compression element 11, so that the valve Closed.
[0072]
At this time, for example, the evaporating temperature of the freezer compartment evaporator 22 is −26 ° C., the refrigerating room evaporator 25 is evaporating temperature of −8 ° C., and the refrigerant evaporates at different temperatures. Cooling of the refrigerator compartment 3 is performed. At the branch of the outlet of the condenser 20, when the refrigerant is divided by approximately half into the freezer compartment evaporator 22 and the refrigerator compartment evaporator 25, the freezer compartment 2 and the refrigerator compartment 3 are cooled with substantially the same refrigerating capacity.
[0073]
The low-stage compression element 11 of the compressor 10 converts the gas refrigerant from the freezer compartment evaporator 22 from the low pressure (minimum pressure of the freezing cycle) of the freezer compartment evaporator 22 to the freezer compartment evaporator 25. The high-stage compression element 12 is compressed to an intermediate pressure of the evaporation pressure level, and the high-stage compression element 12 is compressed to the intermediate pressure by the low-stage compression element 11 and cooled by the intermediate cooler 27. Along with the refrigerant, the pressure is compressed from the intermediate pressure to a high pressure at the condensation pressure level of the condenser 13 (maximum pressure in the refrigeration cycle).
[0074]
The displacement amount of the low-stage compression element 11 and the high-stage compression element 12 is set to be equal or almost equal for the following reason. For example, when R134a or R600a is used as the refrigerant, the evaporation pressure of the evaporator 25 for the refrigerator compartment is higher than the evaporation pressure of the evaporator 22 for the freezer compartment, and the suction gas specific volume of the high-stage compression element 12 is low. However, when the freezer compartment and the refrigerator compartment require substantially the same refrigeration capacity, the refrigerant mass flow rate of the high-stage compression element 12 is equal to the refrigerant mass flow rate of the low-stage compression capacity 11. This is because the refrigerant volume flow rate of the suction gas of each of the compression elements 11 and 12 becomes substantially the same. The actual displacement is set based on the required refrigeration capacity of the freezer compartment and the refrigerator compartment, the predetermined intake gas pressure of the compression elements 11 and 12, the temperature condition, and the like. If the displacement amounts of the two compression elements 11 and 12 are the same, some parts can be shared, the number of parts can be reduced, and the cost can be reduced.
[0075]
The pressure in the sealed container 40 of the compressor 10 is a high-stage compression element suction gas pressure, that is, an intermediate pressure (evaporation pressure level of the refrigerator 25 for the refrigerator compartment). FIG. 8 shows the pressure difference between the compression chamber pressure during one rotation of the low-stage compression element and the high-stage compression element when the compressor 10 performs two-stage compression, and the pressure in the closed container. It shows about the case of an intermediate pressure sealed container and (c) a low pressure sealed container. A rotation angle of 0 ° is defined as a crank rotation angle at the start of compression in each of the low-stage compression element and the high-stage compression element. The solid line indicates the compression chamber pressure, the broken line indicates the pressure inside the sealed container, and the oblique line indicates the pressure difference. The conditions here are the refrigerant R134a, the evaporation temperature of the freezer evaporator -26 ° C., the evaporation temperature of the refrigerator refrigerator −8 ° C., and the condenser condensation temperature 33 ° C. From the figure, (b) The intermediate pressure sealed container has a small pressure difference per rotation, and is effective in reducing the amount of leaked gas due to the pressure difference in the compression process, improving the efficiency of the compressor during two-stage compression. Can be made.
[0076]
The oil supply into the working chamber for sealing the working chamber (suction chamber, compression chamber) of the low-stage compression element is provided in the oil that leaks into the working chamber due to the pressure difference between the hermetic container and the working chamber, and the above-described auxiliary bearing 48. Oil pockets, and oil contained in the inhalation gas. Further, the oil supply into the working chamber for sealing the working chamber of the high-stage compression element is performed by the oil pocket 63 provided in the main bearing 44 and oil contained in the suction gas.
[0077]
The intercooler 27 serves to cool the discharge gas of the low-stage compression element and reduce the intake gas temperature of the high-stage compression element. This reduces the theoretical adiabatic compression work per unit mass of the high-stage compression element. , Compression power can be reduced.
[0078]
During the freezer compartment single cooling operation, both the first solenoid valve 23 and the second solenoid valve 26 are closed. Since the solenoid valve 23 is closed, the refrigerant flow to the refrigerator compartment evaporator 25 is blocked, and the refrigerant flows only to the freezer compartment evaporator 22.
[0079]
At this time, the low-stage compression element 11 of the compressor 10 sucks the gas refrigerant at the outlet of the freezer compartment evaporator 22 and performs a compression action. Of the passages connected to the discharge passage 11b of the low-stage compression element 11, the one solenoid valve 26 side is closed, so the discharge passage of the high-stage compression element 12 on the opposite side of the other discharge-side check valve 13b. The gas refrigerant in the low-stage compression element 12 is compressed to a pressure higher than the gas refrigerant pressure in 12b and passes through the check valve 13b. On the other hand, since the solenoid valves 23 and 26 are closed and the refrigerant is not supplied to the refrigerator 25 for the refrigerator compartment and the intermediate cooler 27 communicating with the suction passage 12a, the high-stage compression element is caused by the suction action of the high-stage compression element 12. The gas refrigerant pressure in the 12 suction passages 12a gradually decreases and becomes lower than the gas refrigerant pressure in the suction passage 11a of the low-stage compression element 11. As a result, the suction-side check valve 13 a is opened, and the gas refrigerant on the suction passage 11 a side of the low-stage compression element 11 flows into the suction passage 12 a side of the high-stage compression element 12.
[0080]
Note that the gas refrigerant pressure in the refrigerator compartment evaporator 25 and the intercooler 27 is the same as the gas refrigerant pressure in the suction passage 12a, and is the evaporation pressure level of the freezer compartment evaporator 22, but the refrigerator compartment evaporator. The temperature of 25 is substantially equal to the air temperature in the refrigerator compartment 3, and the temperature of the intercooler 27 is substantially equal to the air temperature at the bottom of the refrigerator body 1 and is higher than the evaporation temperature of the freezer compartment evaporator 22. . For this reason, the problem that the gas refrigerant in the suction passage 12a condenses and stays in the refrigerating room evaporator 25 and the intercooler 27 can be prevented. Further, the valve 23 is arranged between the branch portion of the refrigerant pipe provided between the evaporator and the condenser and the evaporator. The valve 26 is disposed between the intermediate cooler 27 and the discharge passage 11 b of the compression element 11. By doing in this way, when performing the cooling operation of the storage chamber alone, the amount of the refrigerant remaining in the evaporator 25 and the cooler 27 can be reduced, and the operation efficiency can be kept high.
[0081]
At this time, the two compression elements 11 and 12 perform the compression action in parallel from the evaporation pressure level of the freezer compartment evaporator 22 to the condensation pressure level of the condenser 20, respectively. Accordingly, a freezer compartment single cooling refrigeration cycle including the two compression elements 11 and 12 of the compressor 10, the condenser 20, the first capillary 21, and the freezer compartment evaporator 22 is formed. Further, the condenser fan 30 and the freezer compartment evaporator fan 31 are operated, and the refrigerator compartment evaporator fan 32 is stopped. Thereby, only the freezer compartment 2 is cooled.
[0082]
At this time, the pressure in the sealed container 40 of the compressor 10 is a high-stage compression element suction gas pressure, that is, a low pressure (evaporation pressure level of the freezer compartment evaporator 22). FIG. 9 shows the pressure difference between the compression chamber pressure during one rotation of the compression element and the pressure in the sealed container when the compressor 10 performs single-stage compression, in the case of (a) a high-pressure sealed container and (b) a low-pressure sealed container. Show. The solid line indicates the compression chamber pressure, the broken line indicates the pressure inside the sealed container, and the oblique line indicates the pressure difference. The conditions here are the refrigerant R134a, the evaporation temperature of the freezer evaporator -26 ° C, and the condensation temperature of the condenser 32 ° C. From the figure, (b) In the case of a low-pressure sealed container, the pressure difference per rotation is small, and it is effective in reducing the amount of leaked gas due to the pressure difference in the compression process, and improves the efficiency during single-stage compression of the compressor. be able to.
[0083]
The oil supply into the working chamber for sealing the working chambers (suction chamber, compression chamber) of the two compression elements is the oil contained in the auxiliary pocket 48 and the main bearing 44, and the oil contained in the suction gas, respectively. Is done.
[0084]
Japanese Examined Patent Publication No. 4-54152 is provided with a two-cylinder rotary compressor having two compression chambers in a sealed container, and a valve is provided on a refrigerant passage communicating with the compression chamber (compression element) of the compressor. Thus, a refrigerant flow to each compression chamber is switched between parallel and series.
[0085]
That is, in this prior art, the suction pipe of one compression chamber (low pressure compression element) and the suction pipe of the other compression chamber (high pressure compression element) are connected via a check valve, and the high pressure compression element The discharge pipe of the low-pressure compression element branched in two directions is communicated with the inside of the sealed container via a check valve, and the other is high-pressure via a switching solenoid valve. Connected to the suction pipe of the compression element. Then, the above-described switching solenoid valve is operated according to the required capacity and efficiency that change depending on the operating conditions, and the single-stage compression operation in which the refrigerant flows in parallel through the two compression elements and is compressed once. By switching between two-stage compression operation in which refrigerant flows through one compression element in series and is compressed twice by each compression element, it is intended to exert more appropriate capability over a wide range of operation conditions.
[0086]
The compressor of this prior art is the one in which the inside of the container becomes equal to the pressure of the refrigerant discharged from the high pressure compression element, and it is not changed from the low pressure to the intermediate pressure as in this embodiment. In this embodiment, when each storage room is cooled by a plurality of coolers, the above-described configuration is used to select a more appropriate operation to improve the efficiency of cooling and operation of the refrigerator. Further, the present invention solves the problem of the refrigerant flow that occurs when the refrigerant flow to be passed through the compression element of the compressor is switched, thereby improving the efficiency.
[0087]
Furthermore, with such a configuration, when a hydrocarbon-based refrigerant, which is a flammable refrigerant, is used as the refrigerant, the amount of refrigerant that dissolves into the lubricating oil is reduced, and the overall refrigerant amount used in the refrigerator refrigeration cycle is reduced. Therefore, the possibility of accidents such as ignition due to leakage of the flammable refrigerant is reduced.
[0088]
FIG. 10 shows a control flowchart of the simultaneous cooling operation of the freezer and refrigerator compartment of the refrigerator and the independent cooling operation of the freezer. The control device 101 performs the following processing.
[0089]
If the operation switch of the refrigerator is ON (300Y), the refrigerating room temperature sensor 9 is caused to detect the refrigerating room temperature Tr (301), and it is determined whether the refrigerating room temperature Tr is equal to or higher than the refrigerating room cooling start temperature Trs (302). If the refrigerating room temperature Tr is equal to or higher than the refrigerating room cooling start temperature Trs (302Y), the operation of the condenser fan 30, the freezing room fan 31, the refrigerating room fan 32, and the compressor 10 is started (303), and the freezing room refrigerating room is simultaneously cooled. Do the driving.
[0090]
The timer is started (304), and after a predetermined time has passed (305Y), the refrigerator temperature sensor 9 detects the refrigerator temperature Tr (306), and determines whether the refrigerator temperature Tr is equal to or lower than the refrigerator cooling end temperature Tre (306). 307). If the temperature is not lower than the refrigeration room cooling end temperature Tre (307N), the process returns to step 304, and the freezing room refrigeration room simultaneous cooling operation is continued until the refrigeration room temperature Tr becomes lower than the refrigeration room cooling end temperature Tre.
[0091]
If the refrigerating room temperature Tr is equal to or lower than the refrigerating room cooling end temperature Tre (307Y), the freezer temperature sensor 8 detects the freezing room temperature Tf (308), and if the refrigerating room temperature Tf is equal to or lower than the freezing room cooling end temperature Tfe ( 309Y), the operation of the compressor 10, the condenser fan 30, the freezer compartment fan 31, and the refrigerator compartment fan 32 is stopped, and the freezer compartment refrigerator compartment simultaneous cooling operation is ended (310).
[0092]
The timer is started (311), and after a predetermined time has passed (312), the process returns to step 300. In step 302, if the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs (302N), then the freezer compartment temperature sensor 8 is made to detect the freezer compartment temperature Tf (320), and the freezer compartment temperature Tf is frozen in the refrigerator compartment. It is determined whether the temperature is equal to or higher than the start temperature Tfs (321). If it is lower than the freezer compartment cooling start temperature Tfs (321N), the process proceeds to step 311 and returns to step 300.
[0093]
If the freezer compartment temperature Tf is equal to or higher than the freezer compartment cooling start temperature Tfs (321Y), the solenoid valves 23 and 26 are closed by energization, and the operation of the condenser fan 30, the freezer compartment fan 31, and the compressor 10 is started (322). The room is cooled alone.
[0094]
The timer is started (323), and after a predetermined time has passed (324Y), the refrigerator temperature sensor 9 detects the refrigerator temperature Tr (325), and determines whether the refrigerator temperature Tr is equal to or higher than the refrigerator start temperature Trs ( 326). If it is equal to or higher than the cooling room cooling start temperature Trs (326Y), the operation of the cold room fan 32 is started, the energization of the electromagnetic valves 23 and 26 is stopped, the valve is opened (340), and the freezing room refrigeration is started from the freezing room single cooling operation. The operation proceeds to the room simultaneous cooling operation and proceeds to step 304.
[0095]
If the refrigerating room temperature Tr is lower than the refrigerating room cooling start temperature Trs (326N), the freezing room temperature sensor 8 is caused to detect the freezing room temperature Tf (327), and it is determined whether the freezing room temperature Tf is equal to or lower than the freezing room cooling end temperature Tfe. (328). If the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (328N), the process returns to step 323 to continue the freezer compartment single cooling operation. If it is below freezing room cooling end temperature Tfe (328Y), operation of compressor 10, condenser fan 30 and freezing room fan 31 is stopped, energization to solenoid valves 23 and 26 is stopped, and the valves are opened to individually cool the freezing room. The operation ends, the process proceeds to step 311 and returns to step 300.
[0096]
In step 309, if the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (309N), the solenoid valves 23 and 26 are energized, the valves are closed, and the operation of the refrigerator compartment fan 32 is stopped. The simultaneous cooling operation shifts to the freezer compartment single cooling operation, and the process proceeds to step 323.
[0097]
By controlling the configuration and operation of the above-described embodiment, heater heating for preventing freezing of the refrigerator compartment food is not required, the freezer compartment temperature is, for example, −18 ° C. or less, and the refrigerator compartment temperature is, for example, higher than 0 ° C. 5 It can be set to below ℃, and the temperature of the freezer compartment and the refrigerator compartment can be kept appropriate.
[0098]
Further, during the parallel cooling operation of the freezer compartment and the refrigerator compartment, the gas refrigerant from the evaporator 25 for the refrigerator compartment is further reduced to the low pressure of the evaporation pressure level of the evaporator 22 for the freezer compartment, and not compressed from the low pressure. Since the compression is performed from the intermediate pressure of the evaporation pressure level of the evaporator for the refrigerator compartment, the compression power can be reduced, and the power consumption of the refrigerator can be greatly reduced.
[0099]
Furthermore, since the compressor has two compression elements and is configured to perform two-stage compression control during the parallel cooling operation of the freezing room and the refrigeration room, the pressure difference between the compression chamber and the suction chamber of each compression element is small. Thus, there is an effect in reducing the amount of leaked gas in the compression process, the efficiency of the compressor is improved, and the efficiency of the refrigerator can be improved.
[0100]
Furthermore, during the cooling operation of the freezer alone, the two compression elements of the compressor are compressed in parallel, so the displacement for cooling the freezer is double that of the freezer cold storage simultaneous cooling operation. The freezing room refrigeration capacity can be increased.
[0101]
In addition, a refrigerator having an evaporator in each of the freezer compartment and the refrigerator compartment has a single evaporator, and the evaporation of the evaporator for the refrigerator compartment is compared with a refrigerator that cools both the refrigerator compartment and the refrigerator compartment by forced circulation of cold air. Since the temperature can be increased, the temperature of the cold air discharged to the refrigerator compartment can be increased and the humidity can be maintained high, so that the food stored in the refrigerator compartment can be kept in good condition.
[0102]
Moreover, since the amount of frost formation on the evaporator for the refrigerator compartment is also reduced, the cycle of defrosting by the electric heater is extended, which is effective for reducing power consumption.
[0103]
In addition, since the cold air in the freezer compartment and the refrigerator compartment is completely separated, odor transfer between the freezer compartment and the refrigerator compartment can be prevented.
[0104]
In addition, since an opening is provided for communicating the suction passage of the compression element and the inside of the sealed container of the compressor, the pressure in the sealed container becomes low during single-stage compression of the compressor, and the inside of the sealed container during two-stage compression. The pressure becomes an intermediate pressure. For this reason, the pressure difference between the compression chamber per rotation and the pressure in the sealed container is small, which is effective in reducing the amount of leaked gas due to the pressure difference in the compression process, and the efficiency of the compressor can be improved.
[0105]
Further, since the pressure in the hermetic container of the compressor is set to a low pressure or an intermediate pressure, the amount of refrigerant dissolved in the lubricating oil can be reduced, and it becomes easy to cope with a hydrocarbon-based refrigerant that is a flammable refrigerant.
[0106]
Moreover, since the check valve is disposed in the sealed container, the piping around the compressor can be made compact.
[0107]
In addition, since the two solenoid valves 23 and 26 perform the same opening / closing operation, energization and de-energization of the two solenoid valves in the control device 101 can be made into one circuit, thereby reducing costs. it can.
[0108]
Example 2
A second embodiment of the present invention will be described with reference to FIGS.
[0109]
FIG. 11 is a configuration diagram of the refrigeration cycle of the refrigerator according to the second embodiment, and FIG. 12 is a table showing the opening / closing operation of the solenoid valve of the refrigeration cycle of FIG. At the same time, the operation of the refrigerator according to Example 1 is also shown. In FIG. 11, the same parts as those in FIG.
[0110]
In FIG. 11, the compressor 10 ′ has two compression elements (a low-stage compression element 11 and a high-stage compression element 12) similarly to the compressor 10 of FIG. 1. 70a and 70b are electromagnetic valves provided on the inlet side and the outlet side of the freezer evaporator 22, and 71a and 71b are the suction passages 11a and 12a side and the discharge passages 11b and 12b side of the compression elements 11 and 12, respectively. It is a solenoid valve provided in. By the combination of opening and closing of the six solenoid valves 23, 26, 70a, 70b, 71a, 71b, simultaneous cooling of the freezer compartment and the refrigerator compartment, independent cooling of the refrigerator compartment, and independent cooling of the refrigerator compartment are performed.
[0111]
In the refrigeration cycle of the refrigerator configured as described above, operations of the freezing room refrigerating room simultaneous cooling operation, the freezing room single cooling operation, and the refrigerating room single cooling operation will be described.
[0112]
At the time of the freezing room refrigerating room simultaneous cooling operation, as shown in FIG. 12, the electromagnetic valves 23, 26, 70a and 70b are opened, and the electromagnetic valves 71a and 70b are closed. At this time, the low-stage compression element 11, the intermediate cooler 27, the high-stage compression element 12, the condenser 20, the first capillary 21, and the freezer compartment evaporator 22 of the compressor 10 ′ form a freezer compartment cooling and refrigeration cycle. At the same time, the high-stage compression element 12, the condenser 20, the second capillary 24, and the refrigerating room evaporator 25 of the compressor 10 ′ form a refrigerating room cooling and refrigeration cycle. The compressor 10 ′ performs two-stage compression in which a low-stage compression element 11 and a high-stage compression element 12 are connected in series. Further, the condenser fan 30, the freezer compartment evaporator 31 and the refrigerating compartment evaporator fan 32 are operated.
[0113]
The low-stage compression element 11 of the compressor 10 ′ converts the gas refrigerant from the freezer compartment evaporator 22 from the low pressure (minimum pressure of the freezing cycle) of the freezer compartment evaporator 22 to the refrigerator compartment evaporator 25. The high-stage compression element 12 is compressed to the intermediate pressure by the low-stage compression element 11, and the gas refrigerant cooled by the intermediate cooler 27 is supplied from the refrigerator 25 for the refrigerator compartment. Along with the gas refrigerant, compression is performed from an intermediate pressure to a high pressure at the condensation pressure level of the condenser 13 (maximum pressure in the refrigeration cycle).
[0114]
With the above operation, the simultaneous cooling operation of the freezer compartment and the refrigerator compartment is performed.
[0115]
During the freezer compartment single cooling operation, as shown in FIG. 12, the electromagnetic valves 70a, 70b, 71a, 71b are opened, and the electromagnetic valves 23, 26 are closed. At this time, the two compression elements 11 and 12 are connected in parallel. Since the solenoid valve 70a is opened and the solenoid valve 23 is closed, the refrigerant is supplied to the freezer compartment evaporator 22, and the refrigerant is not supplied to the refrigerator compartment evaporator 25. Since the solenoid valves 23 and 26 are closed and the refrigerant is not supplied to the refrigerator 25 and the intercooler 27 that communicate with the suction passage 12a of the high-stage compression element 12, the high-stage compression element 12 is open. Gas refrigerant from the freezer evaporator 22 is sucked and compressed through the electromagnetic valve 71a. Further, since the electromagnetic valve 26 is closed, the discharge gas of the low-stage compression element 11 passes through the open electromagnetic valve 71b, merges with the discharge gas of the high-stage compression element 12, and enters the condenser 20. Therefore, a freezer compartment single cooling refrigeration cycle including the two compression elements 11 and 12, the condenser 20, the first capillary 21, and the freezer compartment evaporator 22 is formed. Further, the condenser fan 30 and the freezer compartment evaporator fan 31 are operated, and the refrigerator compartment evaporator fan 32 is stopped. Thereby, the independent cooling operation of the freezer compartment is performed.
[0116]
Further, at the time of the refrigerator compartment single cooling operation, as shown in FIG. 12, the electromagnetic valves 23, 71a, 71b are opened, and the electromagnetic valves 26, 70a, 70b are closed. At this time, the two compression elements 11 and 12 are connected in parallel. Since the electromagnetic valve 23 is opened and the electromagnetic valve 70a is closed, the refrigerant is supplied to the refrigerator 25 evaporator, and no refrigerant is supplied to the freezer evaporator 22. Since the electromagnetic valve 70b is closed, the low-stage compression element 11 sucks and compresses the gas refrigerant from the refrigerator for evaporator 25 through the open electromagnetic valve 71a. Further, since the electromagnetic valve 26 is closed, the discharge gas of the low-stage compression element 11 passes through the open electromagnetic valve 71b, merges with the discharge gas of the high-stage compression element 12, and enters the condenser 20. Therefore, a refrigerating room single cooling refrigeration cycle including the two compression elements 11 and 12, the condenser 20, the second capillary 24, and the refrigerating room evaporator 25 is formed. Further, the condenser fan 30 and the refrigerator fan 32 are operated, and the freezer evaporator fan 31 is stopped. Thereby, the independent cooling operation of the refrigerator compartment is performed.
[0117]
Note that the gas refrigerant pressure in the intermediate cooler 27 is the same as the gas refrigerant pressure in the suction passage 12a and is the evaporation pressure level of the refrigerator 25 for the refrigerator compartment, but the temperature of the intermediate cooler 27 is Since it becomes substantially equal to the air temperature at the bottom, it is higher than the evaporation temperature of the refrigerator 25 evaporator, and therefore, the problem that the gas refrigerant condenses and stays in the intermediate cooler 27 can be prevented. Further, since the solenoid valves 70a and 70b are closed, it is possible to prevent the problem that the gas refrigerant circulating in the refrigeration cycle is cooled by the freezer compartment evaporator 22, and is condensed and retained.
[0118]
In the present embodiment, since the simultaneous (parallel) cooling operation of the freezer compartment and the refrigerator compartment, the cooling operation of the freezer compartment alone, and the cooling operation of the refrigerator compartment alone can be switched, the food in the refrigerator compartment is the same as in the first embodiment. Heater heating to prevent freezing is unnecessary, for example, the freezer temperature can be -18 ° C or lower, and the refrigerator temperature can be 5 ° C or lower higher than 0 ° C. Can keep.
[0119]
In addition, since the refrigerator compartment can be operated alone as compared with the first embodiment, when only the refrigerator compartment is required for cooling, the freezer compartment is not simultaneously cooled as in the first embodiment. Since only the refrigerator compartment can be cooled, excessive cooling of the freezer compartment can be prevented.
[0120]
Also, during simultaneous cooling operation in the freezer compartment, the gas refrigerant from the evaporator for the refrigerator compartment is further reduced to the low pressure of the evaporation pressure level of the evaporator for the freezer compartment, and not compressed from that low pressure, but for the refrigerator compartment. Since it compresses from the intermediate pressure of the evaporation pressure level of an evaporator, compression power can be reduced and the power consumption of a refrigerator can be reduced significantly.
[0121]
Furthermore, since the compressor has two compression elements and is configured to perform two-stage compression control during the simultaneous cooling operation of the freezer compartment and the refrigerator compartment, the pressure difference between the compression chamber and the suction chamber of each compression element becomes small, and the compression process This is effective in reducing the amount of leaked gas, improving the efficiency of the compressor and improving the efficiency of the refrigerator.
[0122]
In addition, during the freezing room (or refrigeration room) single cooling operation, the two compression elements of the compressor are compressed in parallel, so the amount of displacement for cooling the freezing room (or refrigeration room) is refrigerated in the freezer room. It becomes twice (or four times) that in the simultaneous cooling operation of the room, and the freezing capacity of the freezing room (or refrigeration room) can be increased.
[0123]
In addition, a refrigerator having an evaporator in each of the freezer compartment and the refrigerator compartment has a single evaporator, and the evaporation of the evaporator for the refrigerator compartment is compared with a refrigerator that cools both the refrigerator compartment and the refrigerator compartment by forced circulation of cold air. Since the temperature can be increased, the temperature of the cold air discharged to the refrigerator compartment can be increased and the humidity can be maintained high, so that the food stored in the refrigerator compartment can be kept in good condition.
[0124]
Moreover, since the amount of frost formation on the evaporator for the refrigerator compartment is also reduced, the cycle of defrosting by the electric heater is extended, which is effective for reducing power consumption.
[0125]
In addition, since the cold air in the freezer compartment and the refrigerator compartment is completely separated, odor transfer between the freezer compartment and the refrigerator compartment can be prevented.
[0126]
[Example 3]
A third embodiment of the present invention will be described with reference to FIGS.
[0127]
FIG. 13: is a perspective view of the refrigerator which shows the outline of the refrigerating cycle of the refrigerator based on the 3rd Example of this invention, and is a perspective view which shows the structure inside. FIG. 14 is a longitudinal sectional view showing an outline of the structure of the refrigerator shown in FIG. FIG. 15 is a schematic view of a panel for operating the refrigerator provided in the refrigerator shown in FIG. FIG. 16 is a table showing the opening / closing operation of the solenoid valve of the refrigeration cycle of the refrigerator shown in FIG. 17 to 20 are flowcharts showing a control flow of the operation of the refrigerator shown in FIG.
[0128]
13 and 14, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted. The refrigeration cycle configuration of the present embodiment is the same as the refrigeration cycle configuration shown in FIG. 1 of the first embodiment, and when referring to FIG.
[0129]
The difference between the refrigerator shown in the present embodiment and the refrigerator shown in FIG. 1 is that the refrigerator of this embodiment is placed behind the vegetable compartment 3B arranged below the refrigerator compartment 3A and the refrigerator 25 for refrigerator compartment and the refrigerator. The room fan 32 is disposed, and a wall of the refrigerator compartment 3A on the rear side of the refrigerator has a cold air passage through which air cooled by the cooler 25 supplied to the refrigerator compartment 3A by driving the fan 32 flows. And an opening through which the cold air flows into a space partitioned by a shelf provided in the refrigerator compartment 3A from the inside of the passage. An operation panel that can be operated by the user is provided on the door disposed on the front side of the refrigerator in the refrigerator compartment 3A. By operating the operation panel, the user adjusts the operation of the refrigerator to perform a desired operation. Can be performed.
[0130]
Moreover, the heat insulation partition wall provided with the heat insulating material which partitions the inside of a refrigerator up and down is arrange | positioned under the vegetable compartment 3B, and the freezer compartment 2 is provided under this heat insulation partition wall. This freezer compartment is divided into a plurality of chambers in the top and bottom, and containers 2A and 2B formed by opening the top in the respective chambers are arranged. A plurality of doors for opening and closing the chamber are provided. And the said container moves to the refrigerator front-back direction with the movement by the opening / closing operation | movement of these doors.
[0131]
A freezer compartment evaporator 22 and a freezer compartment fan 31 are arranged behind the freezer compartment 2 partitioned into a plurality of compartments, and the air cooled by the evaporator 22 by the drive of the freezer compartment fan is frozen. It is supplied into the chamber 2. In the present embodiment, the supplied cold air is supplied so as to flow into the container from the opened upper side of the containers 2A and 2B, and flows from the inside of the container to the outside of the container or directly flows from the outside of the container to the inside of the container and the container. Is cooled, flows from the return port of the cool air provided behind the container 2 </ b> B toward the evaporator 22, and is cooled again by the evaporator 22.
[0132]
In FIG. 13, the compressor 10 ″ includes two compression elements, a low-stage compression element (first compression element) and a high-stage compression element (second compression element), as in the compressor 10 shown in FIG. ) And two check valves are disposed in the sealed container 40 ″. Unlike the compressor 10 shown in FIG. 3, the discharge pipe 12 b ″ of the high-stage compression element is provided so as to extend from the side surface of the sealed container 40 ″ to the outside of the container. As a result, the high-temperature discharge gas is discharged out of the sealed container 40 ″ as soon as possible, and the influence of heating on the gas having a lower temperature than the discharge gas is reduced, and the tube 11a ′, 11b ′, 12a ′ is separated. As a result, a space necessary for the welding work of these pipes is secured, and the work becomes easy.
[0133]
  In this figure, 20A is a condenser, for example, having a structure in which fins are provided on a refrigerant pipe by insertion or winding, etc., provided at the bottom on the back side of the refrigerator body 1 ', and a compressor 10' 'or intermediate This condensation along with the cooler 27vesselIt is arrange | positioned in the machine room which is the space which accommodates 20A. 20B is the condensationvesselA pipe connected to the refrigerant pipe is provided so as to come into contact with and in close contact with a steel plate which is an outer plate forming the side surface and the back surface of the refrigerator main body 1 ′. Thereby, the refrigerant flowing in the pipe 20B can exchange heat with the external space via the outer plate (steel plate) to radiate heat.
[0134]
As described above, the intermediate cooler 27 is disposed in the machine room, and in this embodiment, the condenser 20A and the intermediate cooler 27 are configured as an integral heat exchanger as the same finned pipe as the condenser 20A. Are arranged together. Thereby, the cost of the refrigerator can be reduced, and the size of the machine room can be reduced to secure a large storage room in the refrigerator.
[0135]
As described above, in FIG. 14, the refrigerator 1 'has two freezing rooms (2A, 2B), a refrigeration room 3A, and a vegetable room 3B. Reference numerals 80 and 81 denote temperature sensors for detecting the surface temperatures of the freezer compartment evaporator 22 and the refrigerator compartment evaporator 25, respectively. 101 'is a control device of the refrigerator of this embodiment. Reference numeral 106 'denotes an operation panel provided on the door of the refrigerator compartment 3A.
[0136]
In the refrigerator of this embodiment, as in the refrigerator shown in FIG. 3, the control device 101 ′ is provided with a temperature sensor 8 for the freezer compartment, a temperature sensor 9 for the refrigerator compartment (the temperature sensor for the vegetable compartment is not shown). Alternatively, signals from the temperature sensor 80 of the freezer compartment evaporator 22, the temperature sensor 81 of the refrigerator compartment evaporator, etc. are inputted, and based on these signals, the compressor 10 ″, the fan 30, 31 and 31, the heaters 6 and 7 for the evaporator, and the operation of the electromagnetic valves 23 and 26 are adjusted.
[0137]
In FIG. 15, the operation panel 106 ′ is set with a quick cooling button 90, a quick freezing button 91, a refrigerator temperature setting button 92, a freezer temperature setting button 93, and LEDs 90 a and 91 a indicating operating states of quick cooling and quick freezing. LEDs 92a and 93a indicating the detected temperature, the detected temperature, or the difference between them are provided. By operating these buttons, the user can instruct the refrigerator to perform a desired operation.
[0138]
In this embodiment, by operating the above-described button on the operation panel 106 or the LED directly, the refrigerator compartment temperature and the freezer compartment temperature can be selected by setting according to the strong, medium, and weak cooling, respectively. When the cooling setting is selected, the temperature at which the cooling is started and the temperature at which the cooling is ended are set for each of the refrigerator compartment 3A or the freezer compartments 2A and 2B corresponding to the selected strong, medium, or weak. . In the present embodiment, the temperature at which the cooling is finished is set to increase in the order of strong, medium, and weak. Based on the set temperature and the signal detected and output by the sensors 8 and 9, the control device 101 'determines and adjusts the operation and operation of the refrigerator.
[0139]
As shown in FIG. 16, the refrigerator having the above configuration is configured to adjust the opening and closing of the electromagnetic valves 23 and 26 to perform the parallel cooling operation A for the freezer compartment and the refrigerator compartment, the parallel cooling operation B for the freezer compartment and the refrigerator compartment, and the freezer compartment. It is operated in three operation modes of single cooling operation. In this embodiment, when R134a or R600a is used as the refrigerant, the evaporation temperature of the freezer compartment evaporator 22 is −26 ° C., and the evaporation temperature of the refrigerator compartment evaporator 25 is −8 ° C., the specific volume of the refrigerant gas is From the relationship, in the operation of the refrigerator and the refrigeration cycle with both the solenoid valves 23 and 26 being the first operation mode open, the ratio between the refrigeration capacity of the freezer compartments 2A and 2B and the refrigeration capacity of the refrigerator compartment 3A is about 1. Pair one.
[0140]
Further, in the operation state of the refrigerator and the refrigeration cycle with the electromagnetic valve 23 in the second operation mode opened and the electromagnetic valve 26 closed, the ratio of the freezing capacity of the freezer compartments 2A and 2B to the freezing capacity of the refrigerator compartment 3A. Is about 1: 2. In these first and second operation modes, the refrigerator compartment 3A and the freezer compartments 2A, 2B are cooled in parallel (simultaneously). These first and second operation modes are operations in which the refrigerator compartment and the freezer compartment are cooled simultaneously (in parallel) with different ratios of the cooling capacity required for the refrigerator compartment 3A and the freezer compartments 2A and 2B. is there.
[0141]
Furthermore, in the cooling operation of the freezer compartment alone performed with both the solenoid valves 23 and 26 being the third operation mode closed, only the freezer compartment is cooled, and the refrigerator compartment is not cooled.
[0142]
The parallel cooling operation A of the freezing room and the refrigerating room is the same as the simultaneous (parallel) cooling operation of the freezing room and the refrigerating room described in the first embodiment. The cooling operation of the freezer compartment alone is the same as the single cooling operation of the freezer compartment described in the first embodiment. Therefore, in the third embodiment, an operation mode in which the refrigeration room refrigeration capacity is approximately twice the freezer refrigeration capacity compared to the first embodiment is added, so that the freezer load and the refrigeration room of the refrigerator are added. The operation corresponding to the load becomes possible, and it becomes possible to respond more precisely to the user's request, and it is possible to suppress unnecessary cooling, improve the efficiency of cooling, and reduce power consumption.
[0143]
Since the simultaneous cooling operation A and the freezing room single cooling operation of the freezing room and the freezing room are described in detail in Example 1, they are omitted here, and the freezing room freezing room simultaneous cooling operation B is again illustrated in FIGS. This will be described below with reference to FIGS.
[0144]
In the parallel cooling operation B of the freezer compartment and the refrigerator compartment, since the electromagnetic valve 23 is in the open state, the refrigerant is supplied to and flows through both the evaporator 22 for the refrigerator compartment and the evaporator 25 for the refrigerator compartment. The first compression element (low-stage compression element) 11 of the compressor 10 ″ sucks the gas refrigerant at the outlet of the freezer compartment evaporator 22 and performs compression. However, since the solenoid valve 26 is closed, the refrigerant does not flow into the intermediate cooler 27 and is in the discharge passage 12b of the second compression element (high-stage compression element) 12 on the opposite side of the discharge-side check valve 13b. The gas refrigerant of the first compression element 11 is compressed up to a pressure higher than the gas refrigerant pressure of and passes through the check valve 13b. On the other hand, the high-stage compression element 12 sucks the gas refrigerant at the outlet of the refrigerator for the refrigerator compartment 25 and performs compression. At this time, since the evaporation pressure of the evaporator 25 for the refrigerator compartment is higher than the evaporation pressure of the evaporator 22 for the freezer compartment, the check valve 13a is closed.
[0145]
In other words, the low-stage compression element 11 of the compressor 10 ″ changes the gas refrigerant from the freezer compartment evaporator 22 from the low pressure of the freezer compartment evaporator 22 to the high pressure of the condenser 13 condensing pressure level. The refrigeration cycle that cools the freezer compartment together with the condenser 20, the first capillary 21, and the freezer compartment evaporator 22 is formed. On the other hand, the high-stage compression element 12 compresses the gas refrigerant from the evaporator 25 for the refrigerator compartment from the intermediate pressure at the evaporator level of the evaporator 22 for the refrigerator compartment to the high pressure at the condensation pressure level of the condenser 13. Together with the second capillary 24 and the refrigerator 22 for the refrigerator compartment, a refrigeration cycle for cooling the refrigerator compartment is formed. At this time, the pressure in the sealed container 40 of the compressor 10 ″ is an intermediate pressure that is the pressure of the suction gas of the high-stage compression element 12.
[0146]
At this time, the condenser fan 30, the freezer compartment fan 31, and the refrigerator compartment fan 32 are operated. In this operation, the gas refrigerant from the refrigerator compartment evaporator 25 is further reduced to a low pressure of the evaporation pressure level of the freezer compartment evaporator 22, and is not compressed from the low pressure, but the evaporation pressure of the refrigerator compartment evaporator. Since the compression is performed from the intermediate pressure level, the compression power can be reduced, and the power consumption of the refrigerator during the actual operation can be greatly reduced.
[0147]
The temperature of the intermediate cooler 27 is substantially equal to the air temperature at the bottom of the refrigerator main body, and is higher than the evaporation temperature of the refrigerator 25 for the refrigerator compartment, so that the problem that the gas refrigerant condenses and stays in the intermediate cooler 27 is Absent.
[0148]
  At this time, for example, if R134a or R600a is used as the refrigerant, and the freezer compartment evaporation temperature is −26 ° C. and the refrigerator compartment evaporation temperature is −8 ° C., the displacement amount of the low-stage compression element 11 and the high-stage compression element 12 is equal or nearly equal. Thus, since the specific volume of the suction gas of the high-stage compression element 12 is almost half of the specific volume of the suction gas of the low-stage compression element 11, the refrigerant mass flow rate of the high-stage compression element 12 is the refrigerant mass of the low-stage compression element 11. About twice the flow rate and coolFreezing roomThe ratio between the freezing capacity and the freezing room freezing capacity is about 1: 2.
[0149]
Next, a control flowchart according to the present embodiment will be described with reference to FIGS. The following processing is performed by the control device 101 '. A case where a user command is received from the operation panel 106 'will be described later.
[0150]
In this control, the combination of the refrigerator compartment temperature and the freezer compartment temperature is divided into four combinations according to the operation state at that time, and the parallel (simultaneous) cooling operation A, the freezer compartment and the refrigerator compartment for the freezer compartment and the refrigerator compartment for each. The parallel (simultaneous) cooling operation B of the chambers, the independent cooling operation of the freezing chamber, and the stop are performed. This process will be described with reference to a flowchart.
[0151]
In FIG. 17, if the operation switch of the refrigerator is ON (400Y), the refrigerator compartment temperature sensor 9 and the freezer compartment temperature sensor 8 are caused to detect the refrigerator compartment temperature Tr and the refrigerator compartment temperature Tf, respectively, in the operation stop state (401). It is determined whether or not the refrigerating room temperature Tr is equal to or higher than the refrigerating room cooling start temperature Trs, and whether or not the freezing room temperature Tf is equal to or higher than the freezing room cooling start temperature Tfs (402).
[0152]
If the refrigerator compartment temperature Tr is not less than the refrigerator compartment cooling start temperature Trs and the refrigerator compartment temperature Tf is not less than the refrigerator compartment cooling start temperature Tfs (402a), the condenser fan 30, the refrigerator compartment fan 31, the refrigerator compartment fan 32, and the compressor 10 The operation is started (403), and the freezing room and the refrigerating room in which the freezing room refrigerating capacity and the refrigerating room refrigerating capacity are substantially equal are subjected to the parallel cooling operation A, and the process proceeds to the reference numeral.
[0153]
If the refrigerator compartment temperature Tr is equal to or higher than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is less than the refrigerator compartment cooling start temperature Tfs (402b), the solenoid valve 26 is energized to close the valve, and the condenser fan 30, The operation of the room fan 31, the refrigerating room fan 32, and the compressor 10 is started (420), and the freezing room and refrigerating room parallel cooling operation B in which the refrigerating room refrigerating capacity is approximately twice the refrigerating room refrigerating capacity is performed. Move to (D).
[0154]
If the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is equal to or higher than the refrigerator compartment cooling start temperature Tfs (402b), the solenoid valves 23 and 26 are energized, the valves are closed, and the condenser fan 30 Then, the operation of the freezer compartment fan 31 and the compressor 10 is started (430), the cooling operation of the freezer compartment alone is performed, and the flow shifts to the symbol (E).
[0155]
Moreover, if the refrigerator compartment temperature Tr is less than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is less than the refrigerator compartment cooling start temperature Tfs (402b), the operation stop state is continued, and the process proceeds to the reference (C).
[0156]
When the freezing room and refrigerating room parallel cooling operation A is performed, the timer is started (404) through the reference (B) in FIG. 18, and after a predetermined time has passed (405Y), the temperature sensors 8 and 9 are set to the freezer temperature. Tf and the refrigerator compartment temperature Tr are detected (406), and it is determined whether the refrigerator compartment temperature Tr is equal to or lower than the refrigerator compartment cooling end temperature Tre and whether the refrigerator compartment temperature Tf is equal to or lower than the refrigerator compartment cooling end temperature Tfe (407).
[0157]
If the refrigerating room temperature Tr is equal to or lower than the refrigerating room cooling end temperature Tre and the freezing room temperature Tf is equal to or lower than the freezing room cooling end temperature Tfe (407a), the compressor 10, the condenser fan 30, the freezing room fan 31, and the refrigerating room fan 32 The operation is stopped (408), the parallel cooling operation A for the freezing room and the refrigerating room is finished, and the process proceeds to the code (C).
[0158]
Further, if the refrigerator compartment temperature Tr is equal to or lower than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is higher than the refrigerator compartment cooling end temperature Tfe (407b), the solenoid valves 23 and 26 are closed, and the operation of the refrigerator compartment fan 32 is stopped. (440) The parallel cooling operation A for the freezer compartment and the refrigerating compartment is shifted to the freezer compartment single cooling operation, and the process proceeds to the symbol (E).
[0159]
Further, when the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is equal to or lower than the refrigerator compartment cooling end temperature Tfe (407c), the electromagnetic valve 26 is closed (441), and the refrigerator compartment refrigerator compartment simultaneous cooling operation is performed. It moves from A to parallel cooling operation B of the freezing room and the refrigerating room, and moves to the code (D).
[0160]
If the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (407d), the freezer compartment refrigerator compartment simultaneous cooling operation A is continued, and the code (B Return to).
[0161]
In the case of the operation stop state, the timer is started through the code (C) (409), and after a predetermined time has passed (410Y), the process returns to the code (A).
[0162]
When the parallel cooling operation B of the freezing room and the refrigerating room is performed, the timer is started (421) through the sign (D) in FIG. 19, and after a predetermined time (422Y), the temperature sensors 8 and 9 are connected to the freezing room. The temperature Tf and the refrigerating room temperature Tr are detected (423), and it is determined whether the refrigerating room temperature Tr is equal to or lower than the refrigerating room cooling end temperature Tre and whether the freezer temperature Tf is equal to or lower than the freezing room cooling end temperature Tfe (424). .
[0163]
If the refrigerating room temperature Tr is equal to or lower than the refrigerating room cooling end temperature Tre and the freezing room temperature Tf is equal to or lower than the refrigerating room cooling end temperature Tfe (424a), the compressor 10, the condenser fan 30, the freezing room fan 31, and the refrigerating room fan 32 The operation is stopped (408), the parallel cooling operation B of the freezing room and the refrigerating room is finished, and the process proceeds to the code (C).
[0164]
If the refrigerator compartment temperature Tr is equal to or lower than the refrigerator compartment cooling end temperature Tre and the refrigerator compartment temperature Tf is higher than the refrigerator compartment cooling end temperature Tfe (424b), the solenoid valve 23 is closed and the operation of the refrigerator compartment fan 32 is stopped (426). ), The parallel cooling operation B of the freezing room and the refrigerating room is shifted to the freezing room single cooling operation, and the process proceeds to the symbol (E).
[0165]
If the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is equal to or lower than the refrigerator compartment cooling end temperature Tfe (424c), the parallel cooling operation B of the freezer compartment and the refrigerator compartment is continued, and the sign ( Return to D).
[0166]
Also, if the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is higher than the refrigerator compartment cooling end temperature Tfe (424d), the electromagnetic valve 26 is opened (427), and the freezer compartment and refrigerator compartment The parallel cooling operation B is shifted to the freezer / refrigeration chamber cooling operation A, and the process proceeds to the symbol (B).
[0167]
When the cooling operation of the freezer compartment is performed, the timer is started (431) through the symbol (E) in FIG. 20, and after a predetermined time has passed (432Y), the temperature sensors 8 and 9 store the freezer compartment temperature Tf and the refrigerator. The room temperature Tr is detected (433), and it is determined whether the refrigerating room temperature Tr is equal to or higher than the refrigerating room cooling start temperature Trs and whether the freezer temperature Tf is equal to or lower than the freezing room cooling end temperature Tfe (434).
[0168]
If the refrigerator compartment temperature Tr is not less than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is not more than the refrigerator compartment cooling end temperature Tfe (434a), the operation of the refrigerator compartment fan 32 is started and the electromagnetic valve 23 is opened (435). It shifts from the freezer compartment single cooling operation to the freezer compartment refrigerator simultaneous cooling operation B, and moves to the code (D).
[0169]
Further, if the refrigerator compartment temperature Tr is equal to or higher than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (434b), the refrigerator compartment fan 32 starts operating, and the solenoid valves 23 and 26 are opened. (436) The freezer compartment single cooling operation is shifted to the freezer compartment refrigerator simultaneous cooling operation A, and the process proceeds to the symbol (B).
[0170]
Further, if the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (434c), the freezer compartment single cooling operation is continued, and the flow returns to the symbol (E).
[0171]
Further, if the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is equal to or lower than the refrigerator compartment cooling end temperature Tfe (434d), the operation of the compressor 10, the condenser fan 30, and the freezer compartment fan 31 is stopped. Then, the solenoid valves 23 and 26 are opened (437), the freezer compartment single operation is terminated, and the process proceeds to the reference (C).
[0172]
The compressor rotation speed is set to, for example, a larger temperature difference between a temperature difference between the refrigerator temperature Tr and the refrigerator cooling end temperature Tre and a temperature difference between the freezer temperature Tf and the freezer cooling end temperature Tfe. Control in proportion.
[0173]
With regard to the defrosting operation control, for example, the operation time of the freezer compartment fan 31 is integrated, and when the predetermined time is reached, the defrosting electric heaters 6 and 7 are energized to defrost the evaporators 22 and 26 and evaporate. The surface temperature of the vessel is detected by temperature sensors 80 and 81. When each evaporator reaches a predetermined temperature or higher, energization to the electric heaters 6 and 7 is stopped, and the defrosting operation is stopped.
[0174]
When the user operates the quick cooling button 90 of the operation panel 106 ', the cooling operation of the refrigerator compartment is preferentially performed. At this time, the cooling operation of the refrigerator compartment is forcibly set to be strong, and the temperatures of the refrigerator compartment and the freezer compartment are set accordingly. The parallel cooling operation B of the freezing room and the refrigerating room is performed for a certain period of time. Further, the rotation speed of the compressor is set substantially in proportion to the temperature difference between the refrigerating room temperature Tr and the refrigerating room cooling end temperature Tre, and this proportionality constant is set to a value larger than usual. As a result, the cooling capacity of the refrigeration cycle is greater than in normal operation, and the refrigerator compartment is cooled in a shorter time and at a lower temperature.
[0175]
When the user presses the quick freezing button 90 on the operation panel 106 ', the freezing operation of the freezer compartment is preferentially performed. At this time, the cooling operation of the freezer compartment is forcibly set to be strong, and the temperature of the freezer compartment is set accordingly. Then, the cooling operation of the freezer compartment alone is performed for a predetermined time. In the present embodiment, the rotation speed of the compressor during this operation is set to the maximum rotation speed of the compressor.
[0176]
As described above, in this embodiment, the power consumption of the refrigerator can be further reduced by properly using the three operation modes in accordance with the load during normal operation.
[0177]
In addition, efficient operation can be performed by selecting an operation mode that matches the user's command.
[0178]
About the effect of the refrigerator which concerns on the Example demonstrated above, the data are shown below. FIG. 21 is a graph showing the power consumption of the refrigerator according to the embodiment of the present invention and the refrigerator according to the prior art. As shown in FIG. 21, the power consumption when only the freezing room needs to be cooled is lower than that of the present invention in the conventional example in which only the freezing room refrigerating room simultaneous cooling operation is performed (compressor power consumption). Input), fan input, etc.) and heater power consumption (equivalent to cooling room cooling capacity) to prevent freezing of food in the refrigerator compartment is required. Therefore, at this time, in the embodiment of the present invention as compared with the conventional example, for example, the power consumption is about one third, and the power consumption can be significantly reduced.
[0179]
The direct object of the present invention is a refrigerator, but it can also be applied to a refrigeration air conditioner other than a refrigerator having a plurality of evaporators having different evaporation temperatures and cooling a plurality of rooms.
[0180]
In the refrigerator of the first embodiment, as shown in FIG. 2, the refrigerator main body (box) has a structure in which the freezer compartment and the refrigerator compartment are integrated. However, in the present invention, the refrigerator compartment and the refrigerator compartment are separately provided. The present invention can also be applied to a refrigerator that is a box and includes a plurality of boxes.
[0181]
In the first embodiment, as the compressor, a two-cylinder rotary compressor in which a roller portion and a vane portion are integrally formed (the piston roller portion moving in the cylinder has a vane portion) is used. However, the present invention uses other compressors having two or more compression elements, for example, a rotary compressor, a reciprocating compressor, and a scroll compressor in which a roller portion and a vane portion are separated. May be. Further, a plurality of compressors having one compression element may be combined.
[0182]
【The invention's effect】
  As explained above, according to the present invention,While the inside of a warehouse can be cooled efficiently, compression power can be reduced. Further, it is possible to prevent the problem that the refrigerant is condensed and stays in the heat exchanger to which the refrigerant is not supplied.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration of a refrigeration cycle of a refrigerator according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing an outline of a refrigerator using the refrigeration cycle of the embodiment shown in FIG.
FIG. 3 is a longitudinal sectional view showing a structure of a compressor constituting the refrigeration cycle shown in FIG.
4 is a perspective view showing a structure of a second cylinder, a partition plate, a first cylinder, a secondary bearing, and a first discharge chamber cover, which are parts of the compressor shown in FIG. 3;
5 is a perspective view showing a structure of a valve that is a part of the compressor shown in FIG. 3; FIG.
6 is a perspective view showing structures of a main bearing, a second discharge chamber sub-cover, and a second discharge chamber main cover that are parts of the compressor shown in FIG. 3;
7 is a cross-sectional view showing the structure on the second cylinder portion side of the XX cross section of the compressor shown in FIG. 3;
8 is a graph showing the pressure difference between the compression chamber pressure during one rotation and the pressure in the sealed container when the compressor shown in FIG. 3 performs two-stage compression.
9 is a graph showing the pressure difference between the compression chamber pressure during one rotation and the pressure in the sealed container when the compressor shown in FIG. 3 performs single-stage compression.
10 is a flowchart of operation control of the refrigerator of FIG.
FIG. 11 is a schematic diagram showing a configuration of a refrigeration cycle of a refrigerator according to a second embodiment of the present invention.
12 is a table showing opening / closing operations of solenoid valves in the refrigeration cycle of FIG.
FIG. 13 is a perspective view of the refrigerator showing an outline of the refrigeration cycle of the refrigerator according to the third embodiment of the present invention.
14 is a longitudinal sectional view schematically showing the refrigerator of FIG.
15 is an operation panel of the refrigerator of FIG.
16 is a table showing opening / closing operations of solenoid valves in the refrigeration cycle of FIG. 13;
FIG. 17 is a part of a flowchart showing an operation control flow of the refrigerator of FIG.
18 is a part of a flowchart showing an operation control flow of the refrigerator of FIG.
FIG. 19 is a part of a flowchart showing an operation control flow of the refrigerator of FIG.
20 is a part of a flowchart showing an operation control flow of the refrigerator of FIG.
FIG. 21 is a graph showing power consumption of a refrigerator according to an example of the present invention and a refrigerator according to the related art.
[Explanation of symbols]
1,1 '... refrigerator main body
2, 2A, 2B ... Freezer room
3, 3A ... Refrigerated room
3B ... Vegetable room
6, 7 ... Electric heater for defrosting
8,9 ... Temperature sensor
10, 10 ', 10 "... compressor
11 ... Low stage compression element
11a '... Low-stage compression element suction pipe
11b '... Low stage compression element discharge pipe
12 ... High compression element
12a '... high-stage compression element suction pipe
12b ', 12b "... high-stage compression element discharge pipe
12c: Pressure forming passage in the sealed container
13a, 13b ... Check valve
20, 20A, 20B ... Condenser
21, 24 ... Capillary
22 ... Freezer evaporator
23, 26, 70a, 70b, 71a, 71b ... Solenoid valve
25 ... Refrigerator evaporator
27 ... Intercooler
40 ... Airtight container
42 ... Crankshaft
44 ... Main bearing
45, 47 ... Cylinder
46 ... Partition plate
48 ... Sub bearing
49, 50, 51 ... discharge chamber cover
52, 53 ... Roller
63 ... Oil pocket
101, 101 '... control device
102, 103, 104, 105 ... inverter
106, 106 '... operation switches

Claims (5)

A first cooler for cooling the first storage chamber, a second cooler for cooling the second storage chamber, a compressor having first and second compression elements, and a condenser are connected. In a refrigerator equipped with a freezing cycle,
A refrigerant pipe connected to a discharge passage from the first compression element and an inlet of the condenser;
A refrigerant pipe connected to the outlet of the condenser and the first cooler and the second cooler;
A first suction passage connected to the first cooler and the first compression element;
A second suction passage connected to the second cooler and the second compression element;
First valve means provided in a passage connected to the first and second suction passages to stop the flow of refrigerant from the first suction passage to the second suction passage;
Provided in a passage connected to a discharge passage from the first compression element and a discharge passage from the second compression element, and from a discharge passage of the first compression element to a discharge passage of the second compression element Second valve means for stopping the flow of the refrigerant;
A connection passage between the discharge passage from the second compression element and the first suction passage;
Adjusting means for adjusting the flow of refrigerant through the first cooler and the first suction passage and the flow of refrigerant flowing from the second compression element to the first compression element ;
The adjusting means is
A branch portion provided on a refrigerant pipe connecting the condenser and the first and second coolers and branching the refrigerant pipe to the first and second coolers;
First adjusting means provided on a refrigerant pipe between the branch portion and the first cooler for adjusting the flow of the refrigerant in the pipe;
A second adjusting means provided on a connecting passage between the discharge passage from the second compression element and the first suction passage, for adjusting the flow of the refrigerant in the passage;
Control means for adjusting the first and second adjusting means;
With
A refrigerator comprising: a heat exchanger provided on a connection passage between the second adjustment means and the first suction passage . The refrigerator according to claim 1 , wherein the first or second adjusting means is an electromagnetic valve, and the control means adjusts the electromagnetic valve. The adjusting means includes an operation in which the refrigerant supplied to the second cooler sequentially passes through the first and second compression elements, and the refrigerant supplied to the second cooler is the first compression. The refrigerator according to claim 1 or 2 , wherein the operation is switched between the element and the second compression element. The adjusting means includes an operation in which the refrigerant supplied to the second cooler sequentially passes through the first and second compression elements, and the refrigerant supplied to the second cooler is the first compression. a driver passing elements and shunts to the second compression element, the refrigerant supplied to the second cooler according to claim 1 or 2 switching between operation passes only the second compression element refrigerator. The refrigerator according to claim 3 or 4,
A connection passage between a discharge passage from the second compression element and the first suction passage, a sealed container in which the first compression element and the second compression element are disposed, and the first suction A refrigerator including a pressure forming passage in a sealed container that communicates with the passage and a space in the sealed container .

Images