JPH1047826A - Freezing refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a food preserving condition of a freezing refrigerator having a freezing chamber and a refrigerating chamber by elevating a humidity of the refrigerating chamber while elevating a cold-air blow-off temperature of the refrigerator. SOLUTION: A freezing refrigerator comprises a refrigerating cycle for refrigerating, a refrigerating cycle for freezing, and switching means which switches these two cycles, wherein the refrigerating cycle for refrigerating is formed by connecting a compressor 27, a condenser 28, a first throttling device 29, an evaporator 25 for refrigerating, a second throttling device 30, and an evaporator 22 for freezing in series, while the refrigerating cycle for freezing is formed by connecting the compressor 27, the condenser 28, a third throttling device 31, and the evaporator 22 in series. Due to such a construction, during a freezing chamber refrigerating operation, the refrigerating is carried out using the refrigerating cycle for freezing so as to refrigerate at a low evaporating temperature, while during the refrigerating chamber refrigerating operation, the refrigerating is carried out using the refrigerating cycle for refrigerating so as to operate at a high evaporating temperature so that a blow-off cold-air temperature is elevated and a humidity in the refrigerating chamber is held high even if an amount of food accommodated in the refrigerating chamber is small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator which cools a refrigerator and a refrigerator with a single compressor, and more particularly to a refrigerator having a function of maintaining a high humidity in the refrigerator.

[0002]

2. Description of the Related Art A conventional refrigerator of this type is disclosed in Japanese Patent Application Laid-Open No. Hei 6-265260.

Hereinafter, description will be made with reference to the drawings. FIG.
As shown in FIG. 1, reference numeral 1 denotes a refrigerator main body, and a freezing room 3 and a refrigerating room 4 are partitioned by a partition wall 2 having a suction air passage 2a formed therein. A cooling chamber 5 is provided at the back of the freezing chamber 3, and an evaporator 6 and a cooling fan 7 are arranged in the cooling chamber 5. 8 is a cold air discharge port to the refrigerator compartment 4;
It communicates with the discharge air passage 9 of the refrigerator compartment 4. Reference numeral 10 denotes a low-temperature storage room, which is closed by a lid 11 that covers the upper opening. Numeral 12 denotes a humidity control plate attached so as to constitute a part of the lid 11 of the low-temperature storage room 10, which adjusts the humidity in the low-temperature storage room 10 to high humidity. 13 is a gap for taking in a little cooler air from the discharge air passage 9. Numeral 14 denotes a vegetable room, which has a vegetable room lid 15 covering the upper opening, a vegetable room humidity control plate 16 and a vegetable room cold air introduction gap 17 like the low temperature storage room 10.

[0004] Reference numeral 18 denotes a compressor.
The expansion device 20 and the evaporator 6 are sequentially connected to form a refrigeration cycle as shown in FIG.

In the refrigerator having the above-described structure, the cool air generated by the evaporator 6 is cooled by the cooling fan 7.
As a result, the refrigerant is circulated as indicated by the arrow in FIG. 7, and the freezing room 3, the refrigerating room 4, the low-temperature storage room 10, and the vegetable room 14 are cooled to a predetermined temperature. At this time, the cold storage room 10 and the vegetable room 14
When the food is stored in each of the low-temperature storage rooms 10 and the vegetable room 14, the humidity in each of the low-temperature storage rooms 10 and the vegetable room 14 is reduced by steam generated from the food. The humidity inside the low-temperature storage room 10 and the vegetable room 14 is maintained at a high humidity of about 80% RH by the humidity control plate 12 and the vegetable room humidity control plate 16.

[0006]

However, in the above-described conventional configuration, the freezing room 3 and the refrigerating room 4 are provided in the same evaporator 6.
Is cooled by the low-temperature cold air generated in step (1), the humidity in the refrigerator compartment 4 is greatly reduced, and the food is cooled by low-temperature cold air having a large temperature difference from the food.
There is a fear that the drying of the food in the container is promoted.

Further, the low-temperature storage room 10 and the vegetable room 14 increase the degree of sealing and increase the humidity by the moisture evaporating from the food. There was a possibility that it would become.

The present invention has been made to solve such a conventional problem, and increases the temperature of cold air discharged from a refrigerator.
It is an object of the present invention to provide a refrigerator-freezer that can maintain a high humidity in a refrigerator room, a low-temperature storage room, and a vegetable room even when the amount of stored food is small.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a freezing room provided with a refrigerating evaporator and a freezing room cooling fan, and a refrigerating room provided with a refrigerating evaporator and a freezing room cooling fan. A refrigeration cycle for refrigeration, comprising a refrigerator, a compressor, a condenser, a first expansion device, an evaporator for refrigeration, a second expansion device, and an evaporator for refrigeration sequentially connected to the first expansion device, The refrigeration cycle includes a refrigerating refrigeration cycle in which a refrigeration evaporator and a third expansion device that bypasses the second expansion device are connected to the refrigeration evaporator, and switching means for switching between the refrigeration refrigeration cycle and the refrigeration cycle. . With the above configuration, it is possible to operate at a low evaporating temperature by operating in a freezing cycle during a freezing room cooling operation and cool at a high evaporating temperature by operating at a low temperature in a refrigerating cycle during a cooling room cooling operation, The temperature of the evaporator that cools the refrigerator compartment is increased to increase the temperature of the cold air discharged from the refrigerator compartment.
The humidity in the cold storage room and the vegetable room can be kept high.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention is directed to a refrigerating room provided with a refrigerating evaporator and a refrigerating room cooling fan, a refrigerating evaporator and a refrigerating room cooling fan. A refrigerating body having a refrigerator room in which a refrigerating chamber provided with a refrigerator is independently provided, and a refrigerating cycle for refrigerating the compressor, a condenser, a first expansion device, an evaporator for refrigerating, a second expansion device, and an evaporator for freezing are sequentially connected. A refrigerating refrigeration cycle in which a third restrictor that bypasses the first restrictor, the refrigerating evaporator, and the second restrictor is connected to a refrigerating evaporator; and switching means for switching between the refrigerating refrigerating cycle and the refrigerating cycle. In the freezing room cooling operation, the cooling operation is performed at a low evaporating temperature by operating in a freezing refrigeration cycle. Is intended to cool at a high evaporation temperature is operated at Le.

By operating the refrigerating refrigeration cycle in this manner, the evaporation temperature of the evaporator for cooling the refrigerator compartment can be increased, the temperature of the cold air discharged from the refrigerator compartment can be increased, and the refrigerator compartment can be stored even when the amount of food stored is small. , The humidity of the cold storage room and the vegetable room can be kept high.

[0012] Further, the invention according to claim 2 is characterized in that the means for varying the capacity of the compressor, the means for varying the air volume of the refrigerating compartment cooling fan for circulating the cool air from the refrigerating evaporator, the means for varying the air volume of the condenser cooling fan, and Evaporator temperature detection means, refrigeration evaporator temperature detection means, and condenser temperature detection means, the temperature of the refrigeration evaporator during the refrigerator compartment cooling operation is lower than the freezer compartment set temperature, and the refrigeration evaporator during the refrigerator compartment cooling operation Is controlled to a predetermined temperature higher than the freezing room temperature.

According to this configuration, it is possible to prevent a shortage of gas due to refrigerant stagnation in the refrigeration evaporator during the refrigeration cooling operation, and to set the evaporation temperature of the refrigeration evaporator to a high predetermined evaporation even when a load fluctuation or a room temperature fluctuation occurs. Temperature can be controlled.

Further, the invention according to claim 3 is to operate the refrigerating compartment cooling fan for a predetermined time when the refrigerating cycle for refrigerating operation and when the compressor is stopped.

According to this configuration, the humidity in the refrigerator compartment can be further increased by sublimation and melting of the frost adhering to the refrigerator evaporator.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same components as those in the conventional example shown in FIGS. 7 and 8 are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) In FIG. 1, reference numeral 21 denotes a freezing cooling room provided in the freezing room 3, in which a freezing evaporator 22 and a freezing room cooling fan 23 are arranged. Numeral 24 denotes a refrigerator cooling chamber provided in the refrigerator compartment, in which a refrigerator evaporator 25 and a refrigerator cooling fan 26 are arranged.

On the other hand, as shown in FIG. 2, the refrigerating cycle includes a compressor 27, a condenser 28, a first expansion device 29, a refrigeration evaporator 25, and a second expansion device 3.
0 and the refrigeration evaporator 22 are sequentially connected to form a refrigeration refrigeration cycle, and the third expansion device 31 is connected to the first expansion device 29, the refrigeration evaporator 25,
Then, the second expansion device 30 is bypassed, and the compressor 27, the condenser 28, the third expansion device 31, and the refrigeration evaporator 22 are sequentially connected to form a refrigeration cycle for refrigeration. Reference numeral 32 denotes switching means for switching between the refrigeration cycle and the refrigeration cycle.

As shown in FIG. 3, in the Mollier diagram of the above refrigeration cycle, a dotted line 33 is a refrigeration Mollier diagram during the refrigeration cycle operation, and a solid line 34 is a refrigeration cycle during the refrigeration cycle operation. FIG. 3 is a Mollier diagram for use.

In the above configuration, when cooling the freezing compartment 3, the switching means 32 is switched to the refrigerating refrigerating cycle, and the low evaporating temperature (-30 in this embodiment) optimal for cooling the freezing compartment 3 is used. (° C.), the cooling room cooling fan 26 is stopped, and the freezing room cooling fan 23 is operated to cool the freezing room 3 to a predetermined temperature.

When cooling the refrigerating compartment 4, the switching means 32 is switched to the refrigerating refrigerating cycle, and the evaporation temperature of the refrigerating evaporator 25 is increased (in this embodiment,-).
3 ° C.), and the evaporation temperature of the freezing evaporator 22 is
A refrigeration Mollier diagram 33 is formed in which the evaporation temperature is lower and higher than the evaporation temperature during the operation of the refrigeration cycle (−23 ° C. in this embodiment). By operating the cooling fan 26, the refrigerator compartment 4 is cooled to a predetermined temperature.

By repeating this operation, the freezing room 3
And the refrigerating compartment 4 are cooled to predetermined temperatures, respectively, and the temperature of the refrigerating evaporator during the operation of the refrigerating refrigerating cycle is higher than the conventional temperature (-30 ° C.).
Therefore, the temperature of the cool air discharged to the refrigerator compartment 4 can be increased, and the humidity can be maintained high. Further, the low-temperature storage room 10 and the vegetable room 14 provided in the refrigeration room 4 and having a high degree of airtightness reduce the humidity in each low-temperature storage room 10 and the vegetable room 14 by 80% RH even when the amount of food stored is small. It is possible to maintain a high degree of humidity, and to suppress the drying of the food stored in each of the refrigerator compartment 4, the low-temperature storage compartment 10, and the vegetable compartment 14.

Further, since the Mollier chart for refrigeration 33 is operated at a lower compression ratio than the Mollier chart for refrigeration 34, the power consumption can be reduced with higher efficiency than the conventional one.

(Embodiment 2) In FIG. 4, reference numeral 35 denotes a capacity varying means of the compressor 27, which changes the number of revolutions of the compressor 27 in accordance with the heat load in the refrigerator and controls it to a predetermined compressor capacity. 36 is a freezing room cooling fan
An air volume variable means 37 for changing the number of revolutions to control a predetermined air volume, and a temperature detecting means 37 mounted on the surface of the refrigeration evaporator 22.

Numeral 38 denotes an air volume variable means for changing the number of revolutions of the refrigerating compartment cooling fan 26 to control the air volume to a predetermined air volume. Numeral 39 denotes a temperature detecting means mounted on the surface of the refrigerating evaporator 25. Numeral 40 is a temperature detecting means attached to the surface of the condenser 28, 41 is a condenser cooling fan, and 42 is an air volume variable means for changing the number of revolutions of the condenser cooling fan 41 and controlling it to a predetermined air volume.

Reference numeral 43 denotes a refrigerator compartment temperature sensor, 44 denotes a freezer compartment temperature sensor, and 45 denotes an outside air temperature sensor. Numeral 46 denotes a control unit, which is a refrigerator room temperature sensor 43, a freezer room temperature sensor 44, an outside air temperature sensor 45, a temperature detecting unit 39 of the refrigerating evaporator 25, a temperature detecting unit 37 of the refrigerating evaporator 22, and a temperature detecting unit of the condenser 28. The compressor 27, the refrigerator cooling fan 26, and the freezing room cooling fan 2 are controlled by the capacity varying means 35 and the air volume varying means 36, 38, 42 of the compressor 21 based on the output signal from the compressor 40.
3, to control the operation and stop of the condenser cooling fan 41 and to control the capacity by changing the rotation speed.

The above configuration is basically the same as that of the first embodiment. When cooling the freezing compartment 3, the switching means 32 is connected to the compressor 27, the condenser 28, the third expansion device 31, and the refrigeration unit. Is switched to a refrigeration cycle for refrigeration comprising the evaporator 22 for refrigeration.
Temperature detecting means 37 and the temperature detecting means 4 of the capacitor 28
0 and the output signal of the outside air temperature sensor 45, the controller 46 controls the air flow amount varying means 36 to control the freezing room cooling fan 23.
The air flow of the condenser cooling fan 4
Means 1 and the capacity variable means 3 of the compressor 27
5, the capacity of the compressor 27 is varied, and the Mollier charts 47, 4 for refrigeration are set so that the evaporating temperature and the condensing temperature at which the power consumption is the lowest at the operating outside air temperature are obtained.
8, the freezing room 3 is cooled to a predetermined temperature.

Next, when cooling the refrigerator compartment 4, the switching means 32 is switched to the compressor 27, the condenser 28, the first
The refrigeration cycle is switched to the refrigeration cycle including the squeezing device 29, the refrigeration evaporator 25, the second squeezing device 30, and the refrigeration evaporator 22, as shown in the refrigeration Mollier diagrams 49, 50, and 51 in FIG. Evaporator 2
5 is higher than the temperature of the freezing room 3, and the freezing evaporator 22
The air volume of the refrigerating compartment cooling fan 26 is adjusted by the air volume varying means 38, the air volume of the freezing compartment cooling fan 23 is adjusted by the air volume varying means 36, and the air volume of the condenser cooling fan 41 is adjusted to operate at a lower temperature than the freezing compartment 3. 42, and the capacity of the compressor 27 is controlled by the compressor capacity varying means 35, respectively.

Therefore, the evaporation temperature of the refrigerating evaporator 25 can be controlled by the air volume control of the refrigerating room cooling fan 26 and the capacity control of the compressor 27 even if the outside air temperature changes or the cooling load in the refrigerating room 4 changes. At a high evaporation temperature (-3
° C), the difference between the temperature of the cold air discharged from the refrigerator 4 and the temperature of the cooled food can be reduced, and the humidity in the refrigerator 4 can be kept high, so that the drying of the food can be suppressed.

On the other hand, the evaporation temperature of the refrigerating evaporator 22 is controlled by controlling the air volume of the freezing room cooling fan 23 and the compressor 27.
, The evaporation temperature can be maintained at about 3 to 4 ° C. lower than the temperature (−18 ° C.) in the freezing compartment 3 even if a change in the outside air temperature or a change in the cooling load in the freezing compartment 3 occurs. In addition to preventing the problem that the refrigerant condenses and stays in the evaporator 22, the condensing temperature of the condenser 28 can be prevented from increasing by controlling the air volume of the condenser cooling fan 41 even if the load increases, so that the refrigeration cycle for refrigeration can be prevented. Mollier diagrams 49, 50, 51 for refrigeration during operation
Mollier chart for refrigeration during operation of refrigeration cycle for refrigeration 47,
Since it can be operated with an efficient refrigeration cycle having a smaller compression ratio than 48, it is possible to reduce power consumption.

(Embodiment 3) This embodiment has basically the same configuration as the above-described Embodiments 1 and 2 shown in FIGS. 1 to 5, and further includes a refrigeration cycle for refrigeration operation and a stop of the compressor. At the same time, a control function for operating the refrigerating compartment cooling fan for a predetermined time is provided.

As shown in FIG. 6, the compressor 27 receives a detection signal from each of the refrigerator compartment temperature sensors 43 and the freezer compartment temperature sensor 44, and when either the temperature of the refrigerator compartment 4 or the temperature of the freezer compartment 3 becomes lower than a predetermined temperature. It is controlled so that it stops when it is low and runs when it is high.

The switching means 32 is controlled so as to be energized during the refrigerating compartment cooling operation and switched to the refrigerating refrigeration cycle, and to be switched off during the freezing compartment cooling operation to switch to the refrigerating refrigerating cycle. Further, the freezing room cooling fan 23 is controlled to stop during the refrigerator room cooling operation and to operate during the freezing room cooling operation. The refrigerating compartment cooling fan 26 is operated for a predetermined time t1 during switching between the refrigerating compartment cooling operation and the freezing compartment cooling operation.
In addition, control is performed such that the operation is performed for a predetermined time t2 after the compressor 27 is stopped.

FIG. 6 shows the change in humidity in the refrigerator compartment 4 due to the above operation control. The dotted line shows the conventional humidity change,
Usually, the operation is performed at a low evaporation temperature of about −30 ° C., so that the humidity in the refrigerator 4 decreases to the absolute humidity corresponding to the dew point temperature of −30 ° C., and the relative humidity when the temperature in the refrigerator 4 is set to 3 ° C. Results in a very low relative humidity of the order of 5% RH. On the other hand, a solid line indicates a humidity change in the refrigerator compartment 4 of this embodiment.
During the refrigeration operation, the refrigeration compartment 4 is cooled by the refrigeration evaporator 25, but the evaporation temperature of the refrigeration
(−18 ° C.), and in this embodiment, is controlled to about −3 ° C., so that the humidity in the refrigerator 4 decreases only to the absolute humidity corresponding to the dew point temperature of −3 ° C. When the inside of 4 is 3 ° C., the relative humidity is about 65% RH,
When the low-temperature storage room 10 in the refrigerator 4 is at -1 ° C., the relative humidity can be maintained at about 80% RH.

Then, the refrigerating room cooling fan is operated for a predetermined time t1 after switching to the freezing room cooling operation and for a predetermined time t2 after stopping the compressor 27. At this time, since the refrigerant does not flow in the refrigeration evaporator 25, the frost formed on the refrigeration evaporator 25 is sublimated and melted by the heat exchange with the air in the refrigeration room 4 by the operation of the refrigeration room cooling fan 26. , The absolute humidity in the refrigerator compartment 4 increases,
The humidity can be increased to about 80% RH.

As described above, in the case of the present embodiment, the refrigerating compartment cooling fan 26 is operated for a predetermined time when the refrigerating cycle for refrigerating operation and when the compressor is stopped, so that frost formed on the refrigerating evaporator 25 is formed. Sublimation and melting can increase the humidity in the refrigerator compartment 4,
Drying of food can be significantly suppressed.

[0037]

As is apparent from the above description, claim 1
According to the described invention, the refrigerator includes a freezing room provided with a freezing evaporator and a freezing room cooling fan, and a refrigerator body in which a freezing room provided with a refrigeration evaporator and a freezing room cooling fan is independently provided. A refrigerating refrigeration cycle in which a first expansion device, a refrigerating evaporator, a second expansion device, and a refrigerating evaporator are sequentially connected; and the first expansion device, the refrigerating evaporator, and the second evaporator.
A refrigerating refrigeration cycle in which a third constriction device that bypasses the constriction device is connected to a refrigerating evaporator, and switching means for switching between the refrigerating refrigeration cycle and the refrigerating refrigeration cycle. The cooling operation is performed at a low evaporation temperature by operating in a refrigeration cycle, and the operation is performed by a refrigeration cycle for refrigeration to cool at a high evaporation temperature during the refrigerator cooling operation.

Therefore, the evaporation temperature of the evaporator for cooling the refrigerator compartment can be increased, the temperature of the cold air discharged from the refrigerator compartment can be increased, and even when the amount of food stored is small, the refrigerator compartment,
The humidity of the cold storage room and the vegetable room can be kept high.

According to a second aspect of the present invention, there is provided a compressor capacity variable means based on the configuration of the first aspect,
Refrigeration chamber cooling fan air volume variable means for circulating cool air from the refrigeration evaporator, condenser cooling fan air volume variable means, refrigeration evaporator temperature detection means, refrigeration evaporator temperature detection means, and condenser temperature detection means The temperature of the refrigerating evaporator during the refrigerating room cooling operation is controlled to be lower than the freezing room set temperature, and the temperature of the refrigerating evaporator during the refrigerating room cooling operation is controlled to a predetermined temperature higher than the freezing room temperature.

Accordingly, it is possible to prevent a shortage of gas due to refrigerant stagnation in the refrigeration evaporator during the refrigeration operation,
The evaporation temperature of the refrigeration evaporator can be controlled to a predetermined high evaporation temperature even when load fluctuations or room temperature fluctuations occur.
The temperature of the cold storage room and the vegetable room can be kept high.

Further, a third aspect of the present invention is based on the configuration of the first or second aspect, wherein the refrigerating compartment cooling fan is operated for a predetermined time when the refrigeration cycle for refrigeration is operated and when the compressor is stopped.

Accordingly, the sublimation and melting of the frost adhering to the refrigerating evaporator can increase the humidity of the refrigerating room.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a refrigerator-freezer showing a first embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram

FIG. 3 is a Mollier diagram

FIG. 4 is a diagram showing a refrigeration cycle and a control device according to a second embodiment of the present invention.

FIG. 5 is a Mollier chart during the refrigeration cycle operation.

FIG. 6 is an operation explanatory view showing a third embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a conventional refrigerator-freezer.

FIG. 8 is a refrigeration cycle diagram during the refrigeration cycle operation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 3 freezer compartment 4 refrigerating compartment 22 freezing evaporator 23 freezing compartment cooling fan 25 refrigerating evaporator 26 refrigerating compartment cooling fan 27 compressor 28 condenser 29 first expansion device 30 second expansion device 31 third expansion device 32 switching means 35 Capacity changing means 36, 38, 42 Air volume changing means 37, 39, 40 Temperature detecting means 41 Condenser cooling fan

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshito Kimura 4-5-2, Takaidahondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Yoshinori Kawata 4-chome, Takaidahondori, Higashiosaka-shi, Osaka No.2-5 Matsushita Refrigeration Co., Ltd.

Claims (3)

[Claims] 1. A refrigerator having a freezing room provided with a freezing evaporator and a freezing room cooling fan, and a refrigerator body having a freezing room provided with a freezing evaporator and a freezing room cooling fan. A refrigerating refrigeration cycle in which the first expansion device, the refrigerating evaporator, the second expansion device, and the refrigerating evaporator are sequentially connected; and the third expansion device bypasses the first expansion device, the refrigerating evaporator, and the second expansion device. A refrigerating refrigeration cycle in which the expansion device is connected to a refrigerating evaporator; and switching means for switching between the refrigeration refrigeration cycle and the refrigeration cycle. A refrigerator for cooling at a high evaporating temperature by operating a refrigerating cycle during a refrigerating room cooling operation. 2. A means for varying the capacity of a compressor, a means for varying the flow rate of a cooling chamber cooling fan for circulating cool air from a refrigerating evaporator, a means for varying a flow rate of a condenser cooling fan, a means for detecting a refrigerating evaporator temperature, and a means for refrigerating. Evaporator temperature detecting means and condenser temperature detecting means, wherein the temperature of the refrigeration evaporator during the refrigerator compartment cooling operation is lower than the freezer compartment set temperature, and the temperature of the refrigeration evaporator during the refrigerator compartment cooling operation is higher than the freezer compartment temperature. 2. The refrigerator according to claim 1, wherein the temperature is controlled to a predetermined temperature. 3. The refrigerator according to claim 1, wherein the refrigerating compartment cooling fan is operated for a predetermined time when the refrigerating cycle for refrigerating operation and when the compressor is stopped.