JP2010071480A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator appropriately determining balance between operation load and cooling capacity of the refrigerator and reducing waste electric power consumption by appropriately controlling rotational frequency of a compressor. <P>SOLUTION: The refrigerator 100 includes: a refrigerating cycle having a cooler 3 and the compressor 4 with variable rotational frequency; a freezing compartment temperature sensor 13 for detecting the temperature of a freezing compartment 103; and a control device 2 for operating the compressor 4 when the detection temperature by the freezing compartment temperature sensor 13 exceeds starting temperature and stopping the operation of the compressor 4 when the detection temperature is below stop temperature. After first predetermined time passes after start of the compressor 4, when the detection temperature by the freezing compartment temperature sensor 13 is not lowered to the stop temperature, the control device 2 determines the operation load of the refrigerator 100. In accordance with the determination result of the operation load, the control device 2 determines rotational frequency of the compressor 4 and controls the compressor 4 so as to achieve the determined rotational frequency. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigerator equipped with an inverter function.

  In recent years, the compressor rotation speed has been made variable in order to reduce the power consumption of the refrigerator, and when the operating load of the refrigerator is low (that is, when the temperature difference between the room temperature and the target temperature is small), the rotation speed is low. A refrigerator equipped with an inverter function for operating a compressor is generally used. Normally, how many revolutions the compressor is operated from the relationship between the operating load of the refrigerator estimated from the outside air temperature, the capacity of the room (storage room), etc., and the cooling capacity determined from the revolutions of the compressor It is determined. Then, when the compressor is operated at this rotational speed, it can be assumed how long the room temperature will reach the target temperature and the operation of the compressor can be terminated. However, if a large amount of food is put in a room at high temperature while the refrigerator is operating, or if the door is frequently opened and closed, the operating load of the refrigerator increases, and the room is cooled to the target temperature within the expected time. Can not do it. In this way, when it becomes necessary to operate the compressor longer than the time when it is assumed that the operation of the compressor is finished, the balance relationship between the operation load and the cooling capacity is broken, so that the cooling capacity is increased. Control for increasing the rotational speed of the compressor has been generally employed (hereinafter referred to as Conventional Technology 1).

On the other hand, an operating temperature within a predetermined temperature range is set with respect to the target temperature (for example, −21 ° C.) of the freezer compartment, and the temperature detected by the temperature sensor provided in the freezer compartment reaches the upper limit temperature (starting temperature) of the temperature range. In such a case, the compressor is started, and when the lower limit temperature (stop temperature) of the temperature range is reached, there is a refrigerator in which the compressor is stopped (for example, refer to Patent Document 1) (hereinafter referred to as Prior Art 2). . In this refrigerator, when the detected temperature exceeds the high load temperature set higher than the starting temperature, the compressor speed is increased, and when the state exceeding the high load temperature continues for a predetermined time, Furthermore, the number of revolutions of the compressor is increased so that the room is rapidly cooled. On the other hand, when the detected temperature falls below the high load temperature, the rotational speed of the compressor is immediately lowered.
JP 2005-98549 A (page 10, FIG. 5)

  In the prior art 1, the compressor is operated to some extent with the rotation speed increased, and the operation is continued with the rotation speed increased even when the operation load of the refrigerator is reduced. For this reason, it was supposed to operate in a state where the cooling capacity is excessive as compared with the operating load. Therefore, even after the temporary overload caused by high-temperature food input and frequent door opening / closing is resolved, the compressor is operated with the rotation speed increased, and power is wasted. .

  Further, when the balance between the operation load and the cooling capacity of the refrigerator is slightly lost and the operation load is slightly higher, the rotation speed of the compressor is increased regardless of the degree of increase. That is, for example, if the compressor is operated at the current rotation speed and then operated for a few more minutes, even if the room temperature can actually be lowered to the stop temperature, the operation of the compressor can be performed. When it was determined that it was necessary to operate the compressor for a longer time than expected, the rotation speed of the compressor was increased. In other words, the compressor speed is increased even though it can be cooled at the current speed without increasing the speed of the compressor, and unnecessary power consumption is consumed accordingly. It was.

  In the prior art 2, when the state where the temperature detected by the temperature sensor exceeds the high load temperature continues for a predetermined time, it is determined that the operation load of the refrigerator is high and the rotation speed of the compressor is increased. However, even when the temperature does not exceed the high load temperature, the cooling capacity is actually insufficient compared to the operating load, and it may be better to increase the number of revolutions of the compressor to lower the room temperature. . However, since the conventional technique 2 operates at the same rotation speed without increasing the rotation speed even in such a case, the room temperature does not drop to the stop temperature at all, and the compressor operation is continued unnecessarily. was there.

  In addition, if the temperature detected by the temperature sensor falls below the high load temperature even for a moment, the compressor's rotational speed will be lowered even if the room is not sufficiently cooled. In some cases, it was necessary to increase the rotation speed.

  The present invention has been made in view of the above points, and by appropriately determining the balance relationship between the operating load of the refrigerator and the cooling capacity, and appropriately controlling the rotational speed of the compressor, reduction of wasteful power consumption is achieved. It aims at providing the refrigerator which aimed at.

  The refrigerator according to the present invention includes a refrigeration cycle having a cooler and a compressor having a variable number of rotations, temperature detection means for detecting the temperature of the freezer, and compression when the detected temperature of the temperature detection means is equal to or higher than the starting temperature. And a control means for stopping the operation of the compressor when the temperature is lower than the stop temperature, and the control means is a temperature detection means when a first predetermined time has elapsed since the start of the compressor. If the detected temperature does not drop to the stop temperature, the operating load of the refrigerator is determined, the number of rotations of the compressor is determined according to the determination result of the operating load, and the compressor is controlled to be the determined number of rotations To do.

  According to the present invention, after the compressor starts operation and continuously operates for the first predetermined time, the operation load of the refrigerator is determined, and the rotation speed of the compressor is determined according to the determination result of the operation load. Since the compressor is controlled so that the number of rotations becomes the same, it is possible to control the compressor appropriately in accordance with the state in the warehouse, and it is possible to reduce wasteful power consumption and avoid insufficient cooling capacity.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of a refrigerator 100 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the refrigerator 100 according to the embodiment of the present invention. FIG. 3 is a block diagram showing an electrical configuration of the refrigerator 100 according to the embodiment of the present invention.

  The refrigerator 100 includes a refrigeration room 101 at the top, and the refrigeration room 101 has a door 111. The refrigerator compartment door 111 is provided with an operation panel 1 for adjusting the set temperature of each room of the refrigerator 100 and instructing rapid cooling or the like. Below the refrigerating room 101, a switching room 102, a freezing room 103, a vegetable room 104, and an ice making room 105 are configured, and doors 112 to 115 are provided in front of each room 102 to 105. Each of the rooms 101 to 105 is provided with a door switch (not shown) that detects opening and closing of the doors 111 to 115. When the door 111 of the refrigerator compartment 101 is opened, the interior lamp in the refrigerator compartment 101 is opened. (Not shown) lights up. Further, the rooms 101 to 105 are partitioned by a heat insulating material (not shown).

  The cool air generated by the operation of the refrigeration cycle including the cooler 3 and the compressor 4 is sent to the air path 6 connected to the rooms 101 to 105 by the internal fan 5. Openable and closable dampers 121 to 125 (see FIG. 3) are provided in the air passage 6, and the dampers 121 to 125 are installed based on the detected temperatures of the temperature sensors 11 to 15 provided in the rooms 101 to 105. Open and close and adjust the temperature of each of the rooms 101-105. The cold air that has cooled the rooms 101 to 105 is returned to the cooler 3 and cooled again, and is supplied to the rooms 101 to 105 by the internal fan 5.

  A control device 2 is provided on the back of the refrigerator 100. As shown in FIG. 3, the control device 2 includes temperature sensors 11 to 15, a door sensor 16, a compressor 4, an internal fan 5, and dampers 121 to 125. Is connected. And the start / stop of the compressor 4 and the fan 5 in a warehouse, and the rotation speed are controlled by the input of the detected temperature of each temperature sensor 11-15, and the opening / closing of each damper 121-125 is controlled.

  Starting and stopping of the compressor 4 is determined by the temperature detected by the freezer temperature sensor 13 provided in the freezer room 103. Compressed when it has a predetermined temperature range (for example, ± 3 ° C) around the set temperature (for example, -18 ° C) of the freezer compartment 103 and exceeds the upper limit temperature of the temperature range (for example, exceeds -15 ° C) The machine 4 is started, and the compressor 4 is stopped when the temperature falls below the lower limit temperature of the temperature range (for example, below -21 ° C). Hereinafter, the upper limit temperature is referred to as a start temperature, and the lower limit temperature is referred to as a stop temperature.

  The compressor 4 is variable in rotation speed by an inverter function. The higher the number of revolutions, the higher the cooling capacity, but the higher the power consumption. The number of rotations at the start of startup is determined from the outside air temperature, the room capacity to be cooled, and the like. Table 1 below shows an example of a correspondence table between the outside air temperature and the number of rotations when the number of rotations is determined by the outside air temperature.

  The present invention is characterized by appropriate rotational speed control of the compressor 4 taking into account the balance relationship between the operating load and the cooling capacity. Hereinafter, an outline of the operation of the compressor 4 of the present embodiment will be described.

  FIG. 4 is a diagram for explaining an outline of the operation of the compressor 4 in the refrigerator 100 according to the embodiment of the present invention. In particular, FIG. 4A is a diagram illustrating an operation example of the compressor 4 when the balance relationship between the operation load and the cooling capacity is such that the operation load <the cooling capacity. FIG. 4B is a diagram illustrating an operation example of the compressor 4 when the balance relationship between the operation load and the cooling capacity is such that the operation load> the cooling capacity. The temperature diagram of the dotted line in FIG. 4b shows the temperature diagram of FIG. 4a for comparison. FIG. 4 shows an example in which the outside air temperature is 20 ° C. and the rotation speed at the start of the compressor start is 49 rps based on Table 1.

(When operating load <cooling capacity)
When the temperature detected by the freezer temperature sensor 13 reaches the starting temperature, the compressor 4 is started. Here, since the cooling capacity is larger than the operation load, the freezer compartment 103 is cooled by the operation of the compressor 4, and the temperature gradually decreases. Then, when the temperature detected by the freezer temperature sensor 13 reaches the stop temperature, the compressor 4 is stopped. When the compressor 4 is stopped, the operation load of the refrigerator 100 is gradually increased, and when the start temperature is reached, the compressor 4 is started again.

(When operating load> cooling capacity)
When the temperature detected by the freezer temperature sensor 13 reaches the starting temperature, the compressor 4 is started. Here, since the cooling capacity is smaller than the operating load, the cooling rate is slower than the above. Then, after the first predetermined time operation, the temperature detected by the freezer temperature sensor 13 decreases until just before the stop temperature, but does not decrease any more due to insufficient cooling capacity, and is stagnant at that temperature. In this case, it is determined that the balance between the operating load and the cooling capacity is lost, and the rotational speed of the compressor 4 is increased by one step (for example, 8 rpm). Then, the relationship between the operating load and the cooling capacity changes to the relationship of operating load <cooling capacity. After a while, the temperature detected by the freezer temperature sensor 13 reaches the stop temperature, and the compressor 4 is stopped.

  The above is an outline of the operation of the compressor 4 in the refrigerator 100 of the present embodiment, and a more detailed operation of the compressor 4 will be described with reference to FIG.

FIG. 5 is a control flowchart of the refrigerator 100 configured as described above.
First, the control device 2 determines the rotational speed of the compressor 4 based on the outside air temperature of 20 ° C. and Table 1, and starts the compressor 4 at the rotational speed (S1). Then, the operation time of the compressor 4 is once cleared (S2), and then counting of the operation time is started (S3). Next, it is determined whether the temperature detected by the freezer temperature sensor 13 is equal to or lower than the stop temperature (for example, −21 ° C.) (S4). If the detected temperature is equal to or lower than the stop temperature, the compressor 4 is stopped (S13). On the other hand, when the detected temperature of the freezer temperature sensor 13 exceeds the stop temperature, it is determined whether or not a first predetermined time (for example, 70 minutes) set in advance for the compressor 4 has elapsed ( S5). If the first predetermined time has not elapsed, the process returns to S2, and if the first predetermined time has elapsed, the process proceeds to a load determination process (S6). That is, even if the compressor 4 is continuously operated for the first predetermined time, if the temperature of the freezer compartment 103 does not reach the stop temperature, a load determination process is performed.

FIG. 6 is a flowchart showing the flow of the load determination process. Hereinafter, the load determination process will be described with reference to FIG.
When the temperature detected by the freezer temperature sensor 13 is lower than a first predetermined temperature (for example, −17 ° C.) that is equal to or higher than the stop temperature (S51), the temperature sensors 11, 12, 14, and 15 in other rooms are also detected. The second predetermined temperature to the fifth predetermined temperature that are equal to or higher than the damper closing temperature of each room (for example, the refrigerator compartment 101 is 3 ° C., the switching room 102 is −6 ° C., the ice making room 105 is −17 ° C., the vegetable room) If 104 is less than 4 ° C. or the like (S52 to S55), the load is determined to be “small” (S56). On the other hand, if any one of the temperature sensors 11 to 15 exceeds the corresponding first predetermined temperature to fifth predetermined temperature, it is determined that the load is “large” (S57). . In addition, in FIG. 6, although the detection temperature of the temperature sensors 11-15 of all the rooms 101-105 is made into the determination material of load, it is not restricted to this, For example, the freezer compartment temperature sensor 13 and the refrigerator compartment temperature sensor 11 Only the detected temperature may be used as the determination material. The above is the load determination process.

  When it is determined that the load is high in the load determination process, that is, when the operation load state remains high even if the compressor 4 is continuously operated for the first predetermined time, the control device 2 is really insufficient in cooling capacity. Judgment is made and the rotational speed of the compressor 4 is increased by one step (S7, S8). On the other hand, if it is determined that the load is small, the process proceeds to S9, and starts counting the duration of the light load (load small time) (S9).

  When the small load time becomes equal to or longer than the second predetermined time (for example, 20 minutes) (S10), that is, when the low load state continues for the second predetermined time, the cooling capacity is changed to the driving capacity at the present time. In comparison, it is determined that it is large (cooling capacity> operating capacity), and the rotation speed of the compressor 4 is decreased by one step (S11). Then, the small load time is cleared (S12), and the process returns to step S2.

  On the other hand, if the small load time is less than the second predetermined time (S10), the state of the compressor 4 is kept as it is without reducing the rotational speed of the compressor 4, and the process returns to S4. That is, instead of immediately reducing the rotation speed when it is determined that the load is low, the rotation speed is reduced when the low load state continues for the second predetermined time. As a result, when the temperature detected by the temperature sensor having a small heat capacity decreases for a moment and the actual cooling of the entire room is not sufficient, it is possible to eliminate the inconvenience of lowering the rotational speed of the compressor 4 and causing insufficient cooling capacity.

  When the small load time is less than the second predetermined time, the process returns to step S4, and the freezer temperature is determined until it is determined that the low load state has continued for the second predetermined time. When the temperature detected by the sensor 13 is equal to or lower than the stop temperature, the compressor 4 is stopped (S4, S13). Similarly, when it is determined that the operation has continued for the second predetermined time, for example, when the operating load turns to a heavy load due to, for example, the door 113 of the freezer 103 being opened for a long time (that is, YES in step S7). If it is, the rotational speed of the compressor 4 is increased by one step (S8), and the process returns to step S2. Then, the same operation is repeated.

  Hereinafter, a specific operation example of the refrigerator 100 according to the control flowchart of FIG. 5 will be described with reference to FIGS. 7 to 10 show examples of operation of the compressor 4 in the case where the temperature detected by the freezer temperature sensor 13 takes a change in the temperature diagram in the drawing, which will be described in order from FIG. Although the load determination results are shown from the beginning to the end of the operation of the compressor 4 in FIGS. 7 to 10, it is sufficient that the load determination process itself is performed at an appropriate timing (after the first predetermined time has passed). Yes, it is illustrated here for convenience of explanation. Moreover, the dashed-dotted line of FIGS. 7-10 has shown the line of the target temperature (here -18 degreeC) of the freezer compartment 103. FIG.

FIG. 7 is an operation chart when it is determined that the load is small in the load determination after the first predetermined time (for example, 70 minutes) has elapsed.
The temperature detected by the freezer temperature sensor 13 reaches the starting temperature (for example, −15 ° C.), and the compressor 4 starts to start. The load determination is performed when a first predetermined time (for example, 70 minutes) elapses after activation. Here, the detected temperature T1 of the freezer temperature sensor 13 is lower than −17 ° C. (first predetermined temperature), and although not shown here, the other temperature sensors 11, 12, 14, 15 Since the detected temperatures are also lower than the corresponding second predetermined temperature to fifth predetermined temperature, it is determined that the load is small. Therefore, since the operation load is smaller than the cooling capacity, the compressor 4 continues the operation with the current rotation speed without increasing the rotation speed. Thereafter, since the low load state continues for a second predetermined time (for example, 20 minutes), the rotation speed of the compressor 4 is decreased by one step. In other words, as a result of operating the compressor 4, the operating load has changed from a large load to a small load, and since the low load state has continued for the second predetermined time, it is determined that the operation can be performed with a cooling capacity lower than the present time, The rotation speed of the compressor 4 is lowered. That is, appropriate compressor control corresponding to the indoor operating load situation is performed, and wasteful power consumption is reduced.

  And as a result of continuing driving | running in the state which reduced the rotation speed of the compressor 4 1 step | paragraph, since the detection temperature of the freezer compartment temperature sensor 13 reached stop temperature, the compressor 4 stops.

8 to 10 are operation charts when it is determined that the load is large in the load determination after the elapse of the first predetermined time (for example, 70 minutes). Hereinafter, description will be made in order from FIG.
(Operation chart of FIG. 8)
The temperature detected by the freezer temperature sensor 13 reaches the starting temperature (for example, −15 ° C.), and the compressor 4 starts to start. The load determination is performed when a first predetermined time (for example, 70 minutes) elapses after activation. Here, since the detected temperature T2 of the freezer temperature sensor 13 is higher than −17 ° C. (first predetermined temperature), it is determined that the load is large. Although the example of the freezer temperature sensor 13 is shown here, the detection temperature of any of the other temperature sensors 11, 12, 14, and 15 is higher than the corresponding first predetermined temperature to the fifth predetermined temperature, respectively. In some cases, the load is similarly determined to be large. Thus, since it is determined that the load is large and the operation load> the cooling capacity, the compressor 4 increases the rotational speed by one step (here, 8 rpm).

  As a result of continuing the operation with the rotational speed of the compressor 4 increased by one step, the detected temperature of the freezer temperature sensor 13 has reached the stop temperature, so the compressor 4 stops.

(Operation chart of FIG. 9)
The operation of FIG. 9 is the same as that of FIG. 8 until the load determination result at the time when the first predetermined time has passed is large and the rotation speed of the compressor 4 is increased by one stage. In the example of FIG. 9, the temperature of the freezer compartment 103 is not lowered to the stop temperature until the second first predetermined time has elapsed. For this reason, the load determination is performed again when the first predetermined time of the second time has elapsed. In the example of FIG. 9, since it is determined that the load is low in the second load determination, counting of the second predetermined time (for example, 20 minutes) is started while the rotation speed of the compressor 4 is maintained at the current rotation speed. To do. Then, until the second predetermined time elapses, in this example, since the low load state continues, the compressor 4 decreases the rotational speed by one step. Then, as a result of continuing the operation in the state of being lowered by one stage, the compressor 4 stops because the temperature detected by the freezer temperature sensor 13 reaches the stop temperature before the first predetermined time elapses.

(Operation chart of FIG. 10)
The operation of FIG. 10 is the same as that of FIG. 9 until the rotation speed is decreased by one step after the second predetermined time has elapsed. In the example of FIG. 10, the temperature of the freezer compartment 103 rises during the third first predetermined time after the second predetermined time elapses, and the operating load changes from a small load to a large load. . This is the case, for example, when the door 113 of the freezer 103 is opened for a long time. In the load determination after the first first predetermined time has elapsed, in this case, it is determined that the load is large, and the compressor 4 increases the rotation speed by one step (here, 8 rpm).

  As a result of continuing the operation with the rotational speed of the compressor 4 increased by one step, the detected temperature of the freezer temperature sensor 13 has reached the stop temperature, so the compressor 4 stops.

  As described above, in the present embodiment, if the temperature of the freezer compartment 103 cannot be lowered to the stop temperature even after starting the operation of the compressor 4 and continuously operating for the first predetermined time, the refrigerator at that time 100 operating loads are determined, and the rotational speed of the compressor 4 is determined according to the load determination result. That is, at the time after the continuous operation for the first predetermined time, the state of the operating load of the refrigerator 100 is checked, and appropriate compressor control corresponding to the state in the refrigerator is performed. For this reason, it is possible to reduce wasteful power consumption and avoid a lack of cooling capacity.

  Specifically, when it is determined that the load is low in the load determination after the elapse of the first predetermined time, since the rotation speed of the compressor 4 is maintained without increasing, it is possible to suppress wasteful power consumption. be able to. That is, when the operation load after the predetermined time operation is small, the temperature can be lowered to the stop temperature by simply continuing the operation of the compressor 4 without increasing the rotation speed of the compressor 4. Therefore, since the operation is continued at the same rotation speed without increasing the rotation speed of the compressor 4 and the excessive operation is not performed, it is possible to reduce useless power consumption.

  Further, when it is determined that the load is small in the load determination after the elapse of the first predetermined time and the state continues for the second predetermined time, the rotation speed of the compressor 4 is decreased, so that the cooling capacity is excessive. The compressor 4 is not operated in a state, and wasteful power consumption can be suppressed. In other words, since the rotation speed is not reduced unless the low load state continues for the second predetermined time, the temperature detected by the temperature sensor having a small heat capacity is reduced for a moment, and the actual cooling of the entire room is not sufficient. Therefore, there is no case where the load of the compressor 4 is erroneously determined and the rotational speed of the compressor 4 is lowered. Therefore, the situation where the cooling capacity is insufficient can be prevented.

  On the other hand, in order to increase the rotational speed when the load is determined to be large in the load determination after the first predetermined time operation, that is, when the cooling capacity is really insufficient, the rotational speed is increased. Appropriate compressor control is possible.

  Further, during the counting of the first predetermined time, for example, even if the detected temperature of the temperature sensors 11 to 15 rises for a moment, the rotation speed of the compressor 4 is not changed until the first predetermined time elapses. Wasteful power consumption can be reduced.

  As described above, according to the present embodiment, the rotation speed of the compressor 4 is not changed based on the instantaneous detected temperature, but based on the fact that the detected temperature continues to be high or low. Therefore, it is possible to suppress erroneously determining that the load has increased due to temporary temperature fluctuations caused by opening and closing of the door or the like and increasing the rotational speed, or erroneously determining that the load has been decreased and reducing the rotational speed prematurely.

  In the present embodiment, the rotational speed of the compressor 4 is increased / decreased by one stage. However, the present invention is not limited to this, and two or more stages may be increased / decreased. In the present embodiment, the first predetermined temperature that is the reference for determining the operating load is set within the operating temperature range (the stop temperature or more and the start temperature or less), but the temperature is higher than the start temperature. It may be set.

  Further, in the present embodiment, the time from the start of activation to the load determination is set as the first predetermined time, and the time until the next load determination when the load determination result is low is the same as the first time. 1 is a predetermined time, but it is not necessarily the same time. For example, the first time may be 70 minutes, and the next time may be 30 minutes.

It is a front view of the refrigerator 100 which concerns on one embodiment of this invention. It is a cross-sectional view of the refrigerator 100 according to an embodiment of the present invention. It is a block diagram which shows the electric constitution of the refrigerator 100 which concerns on one embodiment of this invention. It is a figure for demonstrating the operation | movement outline | summary of the compressor 4 in the refrigerator 100 of one embodiment of this invention. It is a control flowchart of the refrigerator 100 of FIG. It is a flowchart which shows the flow of the load determination process of FIG. It is an operation | movement time chart of the refrigerator 100 which concerns on one embodiment of this invention (when it is determined that load is small by load determination after driving time passes 1st predetermined time). It is an operation | movement time chart of the refrigerator 100 which concerns on one embodiment of this invention (when it is determined that the load is large by load determination after 1st predetermined time passes). It is an operation | movement time chart of the refrigerator 100 which concerns on one embodiment of this invention (when the load becomes small after increasing the rotation speed by one step). It is an operation | movement time chart of the refrigerator 100 which concerns on one embodiment of this invention (when load becomes large after raising rotation speed one step).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Operation panel, 2 Control apparatus, 3 Cooler, 4 Compressor, 5 Internal fan, 6 Air path, 11-15 Temperature sensor, 16 Door sensor, 100 Refrigerator, 102 Switching room, 103 Freezer, 104 Vegetable room, 105 Ice making Chamber, 111-115 door, 121-125 damper.

Claims (6)

A refrigeration cycle having a cooler and a variable speed compressor;
Temperature detecting means for detecting the temperature of the freezer;
Control means for operating the compressor when the detected temperature of the temperature detecting means is equal to or higher than the starting temperature, and for stopping the operation of the compressor when the temperature is lower than the stop temperature,
The control means determines the operation load of the refrigerator when the temperature detected by the temperature detection means does not decrease to the stop temperature even after continuous operation for a first predetermined time after starting the compressor, A refrigerator characterized in that the number of rotations of the compressor is determined in accordance with the determination result of the operating load, and the compressor is controlled to be the determined number of rotations.   2. The refrigerator according to claim 1, wherein the controller holds the compressor without increasing the number of rotations when the determined operation load satisfies a condition of low load.   When the control means continues the state where the operation load of the refrigerator satisfies the condition of low load for a second predetermined time or more after starting to hold without increasing the rotation speed of the compressor, The refrigerator according to claim 2, wherein the rotation speed of the compressor is lowered.   While the control means holds the compressor without increasing the rotational speed, or while further reducing the rotational speed from the held rotational speed, the operating load of the refrigerator satisfies a predetermined large load condition. The refrigerator according to claim 2 or 3, wherein when the state is changed, the number of rotations of the compressor is increased.   A plurality of rooms, each of which includes a temperature sensor for detecting the temperature, and the control means has a predetermined temperature corresponding to each of the temperature sensors. 4. The refrigerator according to claim 2, wherein when the temperature is lower than the temperature, it is determined that the load is small.   Each of the temperature sensors includes a plurality of rooms, each of which includes a temperature sensor that detects temperature in one or all of the rooms, and the control means includes any one of the detected temperatures of each of the temperature sensors. The refrigerator according to claim 4, wherein the load is determined to be large when the temperature is higher than the corresponding predetermined temperature.

Images