JPH0445013Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a refrigerator that has a freezer compartment and a dedicated compartment, and the dedicated compartment can be switched to various temperatures.

(b) Conventional technology Conventionally, this type of refrigerator is divided into a freezing compartment that is cooled to a freezing temperature and a refrigerating compartment that is maintained at a refrigerating temperature higher than the freezing point, but raw meat and other perishable foods are stored in the freezing compartment. Although it is possible to preserve the food for a long time by freezing it, there is the inconvenience that the flavor is lost when the food is thawed during cooking.Furthermore, although there is no such inconvenience in the refrigerator, the food spoils in a short period of time. It ends up.

In order to overcome these drawbacks, ice temperature storage technology has recently been proposed. This freezing temperature storage is a temperature range below freezing, but just before the food freezes (0°C).
It is a method of storing food refrigerated at a temperature of ~-3°C), which prevents the food from freezing (therefore the flavor is not impaired), inhibits bacterial growth, and keeps the food for a relatively long period of time (one week). degree) can be preserved.

(c) Problems to be solved by the invention If a chamber that is cooled to freezing storage temperature (hereinafter referred to as a dedicated chamber) as described above is formed in a refrigerator, there is no need to store fresh food, for example; When it is necessary to store more frozen food, there is a problem that the dedicated room becomes a completely dead space.

For this reason, for example, in Japanese Utility Model Application Publication No. 59-175974, it is considered to configure the ice room so that it can be switched to the freezing room by setting the temperature control damper thermometer, but a single damper thermometer is used to control the temperature of the ice room. In order to control the cooling to freezing temperature, it is necessary to ensure a considerable amount of cold air is introduced when the damper thermo is open. However, as mentioned above, the ice temperature storage temperature is within a relatively narrow temperature range (0°C to -
3° C.), it is very difficult to maintain the temperature within a narrow range with such an introduced amount, and the range of temperature fluctuation becomes large.

(d) Means for Solving the Problems The refrigerator of the present invention includes a freezer compartment that is cooled to a freezing temperature, a compressor that supplies refrigerant to the cooler based on the temperature of the freezer compartment, and a refrigerator that is cooled to a freezing temperature. The system includes a selection chamber that is cooled to the freezing temperature storage temperature, a blower that supplies cold air cooled by a cooler based on the temperature of the freezing chamber to the freezing chamber and the selection chamber, and a blower that cools the temperature of the selection chamber to the freezing temperature or ice temperature. It is equipped with a switch that sets the warm storage temperature, and a temperature control device that controls the operation of the compressor and blower based on the freezing temperature set by the switch and the temperature of the selection chamber.

(E) Effect According to the present invention, the switch acts to switch the cooling temperature of the selection chamber to the freezing temperature or the freezing temperature storage temperature, and when the freezing temperature is set with this switch, the cooling temperature of the selection chamber is set to the freezing temperature, regardless of the temperature of the freezing chamber. First, since the temperature control device controls the operation of the blower and compressor based on the temperature of the selection chamber, the refrigeration capacity can be expanded.

(F) Example An example will be explained on the ground. FIG. 3 shows a sectional view of the refrigerator 1, and FIG. 4 shows its main parts. The refrigerator 1 has an inner box 3 made of synthetic resin built into an outer box 2 made of a steel plate with a gap therebetween, and a urethane heat insulating material 4 foamed and filled between the two boxes 2 and 3 to form a heat insulating box body. . The inside of the refrigerator 1 is divided into upper and lower parts by a partition wall 5 filled with a heat insulating material.
There is a freezer compartment F cooled to freezing temperature (e.g. -20°C) above, and a refrigeration room below freezing temperature (e.g. +
3°C).
A partition front member 8 is installed across the left and right sides of the opening edge of the refrigerator compartment R, which is a part of the interior of the refrigerator 1.
A heat-insulating partition plate 9 is attached to be supported by this partition front member 8 and a groove 3a formed in the inner box 3 at approximately the same height as this, and the refrigerator compartment R is divided vertically by this partition plate 9. compartmentalized. In the space above the partition plate 9, a box-shaped case 11 which is open to the front is incorporated, forming a cold air passage 10 with a space between the lower surface of the partition wall 5, the upper surface of the partition plate 9, and both sides and rear surface of the inner box 3. It can be done.
The opening edge of the case 11 is brought into contact with the inner box 3, the partition wall 5, and the partition plate 9, thereby creating a dedicated chamber (hereinafter referred to in the embodiment) as a selection chamber that communicates only with the outside of the refrigerator. A private chamber P (simply referred to as a dedicated chamber P) is formed, and the front end of the cold air passage 10 is closed.

A bottom plate 13 of the freezer compartment F having a heat insulating material on the lower surface is provided above the partition wall 5 with a space therebetween, and a cooling chamber 14 is formed between the bottom plate 13 and the partition wall 5.
A cooler 15 included in the cooling unit is housed in the cooling chamber 14, and a blower 16, which is also part of the cooling unit, is provided behind the cooler 15. The motor 16M that drives the blower 16 is housed in a storage box 17 located at the rear of the cooling chamber 14, attached to the inside of the back of the outer box 2, and embedded in the heat insulating material 4. It penetrates through the material 4 and the inner box 3 to face the inside of the cooling chamber 14, and a blowing fan 16F is attached to the tip thereof. The blower 16 rotates to suck in cold air from the direction of the rotation axis and blows it out in the radial direction. The rear side 13a of the bottom plate 13 of the freezer compartment F rises upward with a gap from the rear surface of the inner box 3, and forms a duct 18 that communicates the rear part of the cooling compartment 14 with the freezer compartment F, and is accelerated by the blower 16. The cooled air is discharged into the freezer compartment F from the discharge port 18a at the tip of the duct 18. 19
is a duct member forming a duct 20 that communicates the rear part of the cooling chamber 14 and the cold air passage 10, and the cold air accelerated by the blower 16 is transferred to the inner box 3 at the rear of the cold air passage 10.
The cold air passage 1 is opened from the discharge port 20a formed in the upper part of the rear surface.
It is discharged within 0. Reference numeral 21 denotes a duct that communicates the rear part of the cooling chamber 14 and the refrigerator compartment R, and cold air is discharged into the refrigerator compartment R from a discharge port 21a. The cold air circulating through the freezer compartment F and the cold air passage 10 cools the freezer compartment F by direct cooling, and the dedicated compartment P by indirect cooling from the case 11, and then cools the cold air inlet 22, which communicates with the front part of the cooling compartment 14. 23 and return to the cooling chamber 14, respectively. A return duct 24 is formed in the heat insulating material 4 on the side wall of the refrigerator 1 to communicate the refrigerator compartment R and the front part of the cooling compartment 14, and the cold air in the refrigerator compartment R passes through this and enters the cooling compartment 14 from the intake port 25. Return. 26 is a compressor included in the cooling unit, 27, 28, 29
are doors that freely open and close the front openings of chambers F, P, and R, respectively.

The amount of cold air discharged from the discharge ports 20a and 21a is controlled to open and close by electromagnetic dampers 35 and 36. Here, the electromagnetic dampers 35 and 36 are respectively connected to the intake port 2.
It may be provided at 3 and 25. The electromagnetic damper 35 is attached to a plunger (not shown), an electromagnetic coil 35A, arms 37 and the tip of the discharge port 20a.
It is composed of a double plate 38 that opens and closes.
(The electromagnetic damper 36 has a similar configuration.) FIGS. 1 and 2 show the electric circuit of the present invention. 40 is a negative characteristic thermistor that detects the temperature inside the freezer compartment F, and inputs the terminal potential divided by the resistor 41 to the (-) input terminal of the comparator 42 . The neutral point potential of the variable resistor 44, which is a set potential composed of a series circuit of a resistor 43, a variable resistor 44, and a resistor 45, is input to the (+) input terminal of the comparator 42.
The comparator 42 has hysteresis due to the positive feedback resistor 46. For example, when the temperature of the freezer compartment F reaches -22°C, the output becomes a high potential (hereinafter referred to as "H"), and -
When the temperature reaches 18° C., the potential becomes low (hereinafter referred to as "L"), and its output is input to the OR gate 47, and the output of the OR gate 47 is connected to the base of the transistor 48. A compressor motor 26M and a blower motor 16M are connected to the collector of the transistor 48.
Relay switch 4 connected in series to the parallel circuit of
9 coils 49A are connected. This coil 49
A is energized and the switch 49 is closed, that is, when the temperature of the freezer compartment F is -22°C, the motors 26M and 16
M is operated and stopped at -18°C, so that the temperature inside the freezer compartment F is -20°C on average. This average temperature can be adjusted by changing the setting of the variable resistor 44.
Can be changed up or down. 50 is a negative characteristic thermistor that detects the temperature in the refrigerator compartment R, and the terminal potential with the resistor 51 is inputted to the (-) input terminal of the comparator 52, and the variable resistance of the series circuit of the resistor 53, variable resistor 54, and resistor 55 is inputted to the (-) input terminal of the comparator 52. The neutral point potential of the resistor 54 is input to the (+) input terminal of the comparator 52. The comparator 52 has hysteresis due to a positive feedback resistor 56, its output is connected to the base of a transistor 57, and the collector of the transistor 57 has a relay switch 58 connected in series with the coil 36A of the electromagnetic damper 36.
coil 58A is connected. Electromagnetic damper 36
When the coil 36A is energized, the discharge port 21a is opened, cool air is introduced, and the outlet 21a is closed when the coil 36A is not energized. Further, the comparator 52 is set to a variable resistor 54, for example, in the refrigerator compartment R.
When the temperature inside the refrigerator compartment R is +5°C, the output is set to "H", and when the temperature inside the refrigerator compartment R is +1°C, the output is set to "L", that is, the temperature inside the refrigerator compartment R is set to +3°C on average. This set temperature can be changed by operating the variable resistor 54.

Reference numeral 60 denotes a negative characteristic thermistor for detecting the temperature inside the private room P, and a terminal potential which is a divided potential with respect to the resistor 61 is inputted to the (-) input terminal of the comparator 62. A resistor 63, a variable resistor 64, and a resistor 65 are connected in series to the power supply Vc.c., and the neutral point potential of the variable resistor 64 is input to the (+) input terminal of the comparator 62. Comparator 62 has hysteresis due to positive feedback resistor 63, its output is connected to the base of transistor 64, and the collector of transistor 64 is connected to coil 65A of relay switch 65. The output of comparator 62 is also input to OR gate 47 via analog switch 66. The relay switch 65 opens when the coil 65A is energized and closes when the coil 65A is de-energized, and is connected in series to the coil 35A of the electromagnetic damper 35.
A is energized to open the discharge port 20a, cold air is introduced, and the outlet 20a is closed when energized. That is, comparator 62
When the output becomes "H", cool air is introduced from the discharge port 20a, and when the output becomes "L", the introduction is stopped. or,
When the comparator 62 operates the variable resistor 64 to increase the resistance value between its neutral point and the resistor 65, the set temperature becomes lower, and the output becomes "H" when the temperature inside the dedicated room P is 0 degrees Celsius.
Then, the output becomes "L" at -3℃,
The dedicated room P is controlled to an ice storage temperature of -1.5°C on average. Also, if the resistance value between the neutral point of the variable resistor 64 and the resistor 65 is decreased, the set value becomes higher, and the dedicated chamber P
The output is set to "H" when the temperature is +5°C, and "L" when the temperature is +1°C, so that the refrigeration temperature is controlled to an average of +3°C.
In this way, the dedicated room P can be used as an ice-temperature storage room or a refrigerator room by operating the variable resistor 64, but at this time, since the control temperature is relatively high, the control of the electromagnetic damper 35 is for cooling. It has nothing to do with unit control.

The resistor 63 is further connected in parallel with a series circuit of a resistor 68 and a contact 69A of a double switch (hereinafter simply referred to as the double switch 69) 69 which serves as a switch for setting the cooling temperature of the dedicated room P to freezing temperature or freezing temperature storage temperature. The other contact 69B of the dual switch 69 is connected in series with a resistor 70 between the power supply Vc.c. and ground, and the terminal potential of the resistor 70 is input to the gate of the analog switch 66. The dual switch 69 is provided, for example, on the front surface of the door 28, and is closed when it is desired to use the dedicated chamber P at freezing temperature. That is,
When the contact 69A is closed, the resistor 68 is connected in parallel to the resistor 63, and the potential of the (+) input terminal of the comparator 62 rises all at once, and the output of the comparator 62 is, for example, the temperature of the dedicated room P. It becomes "H" at -18°C, and becomes "L" (depending on the setting of the variable resistor 64) at -22°C. On the other hand, when the contact 69B closes, the terminal potential of the resistor 70 becomes "H".
The analog switch 66 becomes conductive, and the comparator 6
The output of 2 is now input to the OR gate 47. Therefore, until the detected temperature of the dedicated chamber P reaches the predetermined freezing temperature, that is, during the period when the electromagnetic damper 35 is open, regardless of the detected temperature of the freezing chamber F,
It becomes possible to drive the motors 26M and 16M. As a result, even if, for example, the size of the discharge port 20a is set so that it is easy to control the dedicated chamber P to an ice temperature storage temperature, when the dedicated chamber P is used as a freezing chamber, the motor can be reliably operated while the electromagnetic damper 35 is open. 26
Since the M and 16M are operated and cold air is introduced, there is no shortage of cooling, and the temperature can be controlled reliably. In addition, the electrical parts 60 to 70 mentioned above, the OR gate 47, and the transistor 4
8 and the coil 49A constitute a temperature control device.

Here, when using the dedicated compartment P at freezing temperature, the motors 26M and 16M are operated even when the temperature of the freezing compartment F has fallen to a predetermined temperature, so the freezing compartment F is slightly overheated. It may feel a bit cold, but food will not be affected much.

(G) Effect of the invention According to the invention, when the freezing temperature is set with the switch, the temperature control device controls the operation of the blower and compressor based on the temperature of the selected room, so the temperature of the freezing room does not change. Cold air can be introduced into the selection room regardless of the temperature, and the selection room can be used as a freezing room.
It becomes possible to expand the frozen capacity.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention; FIGS. 1 and 2 are electrical circuit diagrams, FIG. 3 is a side sectional view of the refrigerator, and FIG. 4 is an enlarged side sectional view of the same main part. 16...Blower, 26...Compressor, 60...Thermistor, 62...Comparator, P...Special room.

Claims (1)

[Scope of utility model registration request] A freezing compartment that is cooled to a freezing temperature, a compressor that supplies refrigerant to the cooler based on the temperature of the freezing compartment, a selection compartment that is cooled to a freezing temperature or ice temperature storage temperature, and a temperature of the freezing compartment. a blower that supplies cold air cooled by the cooler to the freezer compartment and the selection compartment based on the temperature, a switch that sets the temperature of the selection compartment to the freezing temperature or freezing temperature storage temperature, and the freezing temperature set by this switch. and a temperature control device that controls the operation of the compressor and the blower based on the temperature of the selected room.