CN106871298B

CN106871298B - Operation control method of air conditioner and refrigerator integrated machine

Info

Publication number: CN106871298B
Application number: CN201710214043.3A
Authority: CN
Inventors: 许文明
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd
Priority date: 2017-04-01
Filing date: 2017-04-01
Publication date: 2019-12-31
Anticipated expiration: 2037-04-01
Also published as: CN106871298A

Abstract

The invention discloses an operation control method of an air conditioner and refrigerator all-in-one machine, which comprises the following steps: starting the air conditioner and refrigerator integrated machine and operating a refrigeration mode; controlling 1/4 the first bypass valve and the second bypass valve to open to communicate the bypass line; controlling the first control valve, the fourth control valve and the sixth control valve to be opened, and controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be closed; controlling the compressor to run at high frequency to shut down the indoor heat exchanger; detecting the temperature of the freezing area and the refrigerating area; and controlling the air-conditioning and refrigerator integrated machine according to the time for the freezing area and the refrigerating area to reach the set temperature. According to the invention, electric heating is not needed for unfreezing, so that the unfreezing cost can be saved, the unfreezing efficiency can be improved, the unfreezing energy consumption is reduced, and the safety problem caused by electric leakage is avoided.

Description

Operation control method of air conditioner and refrigerator integrated machine

Technical Field

The invention relates to the technical field of air conditioning, in particular to an operation control method of an air conditioner and refrigerator all-in-one machine.

Background

The existing air conditioner and the refrigerator are two independent refrigerating devices, the annual service time of the air conditioner is averagely less than 30%, the utilization rate of the refrigerator is relatively long, but the refrigerator is basically in a shutdown state in winter in the north. The annual utilization rate of the two refrigeration household appliances is not high, and if the two refrigeration household appliances can be combined into one, a large amount of energy and material cost can be saved.

The existing refrigerator is generally unfrozen by electric heating, so that the unfreezing cost is high, the energy consumption is high, and dangers such as electric leakage and the like are easy to occur.

Disclosure of Invention

The invention aims to provide an operation control method of an air conditioner and refrigerator all-in-one machine, which has the advantages of low unfreezing cost, high unfreezing efficiency, lower energy consumption and higher safety.

According to one aspect of the invention, the operation control method of the air conditioner and refrigerator all-in-one machine comprises the following steps: starting the air conditioner and refrigerator integrated machine and operating a refrigeration mode; controlling 1/4 the first bypass valve and the second bypass valve to open to communicate the bypass line; controlling the first control valve, the fourth control valve and the sixth control valve to be opened, and controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be closed; controlling the compressor to run at high frequency to shut down the indoor heat exchanger; detecting the temperature of the freezing area and the refrigerating area; and controlling the air-conditioning and refrigerator integrated machine according to the time for the freezing area and the refrigerating area to reach the set temperature.

Preferably, the step of controlling the air conditioner and refrigerator integrated machine according to the time for the freezing area and the refrigerating area to reach the set temperature includes: when the temperatures of the freezing area and the refrigerating area reach the set temperature and last for t2 time, the first control valve and the sixth control valve are controlled to be opened fully, the fourth control valve is opened 1/4, the first bypass valve and the second bypass valve are controlled to be opened fully, the second control valve, the third control valve, the fifth control valve and the seventh control valve are closed, and the compressor operates at high frequency.

Preferably, the operation control method further includes: when the temperature of the unfreezing area reaches the set temperature T1 and lasts for T1 time, the first control valve, the fourth control valve and the sixth control valve are controlled to be opened, the second control valve, the third control valve, the fifth control valve and the seventh control valve are controlled to be closed, the first bypass valve and the second bypass valve are controlled to be closed, the compressor is controlled to run at high frequency, the indoor heat exchanger is kept to be shut down, and the air-conditioning and refrigerator all-in-one machine is enabled to enter a normal refrigeration state.

Preferably, T1 is 20 ℃ and T1 is 10 min.

Preferably, the step of controlling the air conditioner and refrigerator integrated machine according to the time for the freezing area and the refrigerating area to reach the set temperature further comprises: when the temperatures of the freezing area and the refrigerating area are detected not to reach the set values or reach the set temperatures but the duration time does not reach t2, controlling the first bypass valve and the second bypass valve to be opened 1/4 to enable the bypass pipelines to be communicated;

controlling the first control valve, the fourth control valve and the sixth control valve to be opened, and controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be closed; controlling the high-frequency operation of the compressor to enable the freezing area and the refrigerating area to operate and refrigerate, and enabling the unfreezing area to operate and unfreeze.

According to the technical scheme, in the operation process, the high-temperature and high-pressure gaseous refrigerant in the compressor can flow into the unfreezing zone from the exhaust port of the compressor through the bypass pipeline, so that the temperature in the unfreezing zone is increased, the purpose of unfreezing is achieved, and the low-temperature and high-pressure gaseous refrigerant cooled after unfreezing returns to the compressor through the outlet of the unfreezing zone and the bypass pipeline, so that electric heating is not needed for unfreezing, the unfreezing cost can be saved, the unfreezing efficiency can be improved, the unfreezing energy consumption can be reduced, and the safety problem caused by electric leakage can be avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic structural diagram of an air conditioner and refrigerator all-in-one machine according to an embodiment of the invention; and

fig. 2 is a flowchart of an operation control method of an air conditioner and refrigerator all-in-one machine according to an embodiment of the present invention.

Description of reference numerals: 10. a compressor; 20. an outdoor heat exchanger; 30. an indoor heat exchanger; 40. a refrigerator; 41. a refrigeration zone; 411. a cold storage area; 412. a freezing zone; 42. a thawing zone; 84. a four-way reversing valve; 60. a throttling device; 01. a first bypass valve; 02. a second bypass valve; 1. a first control valve; 2. a second control valve; 3. a third control valve; 4. a fourth control valve; 5. a fifth control valve; 6. a sixth control valve; 7. a seventh control valve.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.

Referring to fig. 1 in combination, an embodiment of the present invention provides an air conditioner and refrigerator all-in-one machine, including a compressor 10, an outdoor heat exchanger 20, an indoor heat exchanger 30 and a refrigerator 40, where the refrigerator 40 includes a refrigeration area 41 and a thawing area 42, the refrigeration area 41 includes a freezing area 412 and a storage area 411, the thawing area 42 is disposed corresponding to the freezing area 412, a bypass pipeline is connected between the compressor 10 and the thawing area 42, an exhaust port of the compressor 10 is connected to an inlet of the thawing area 42 through the bypass pipeline, and a return port of the compressor 10 is connected to an outlet of the thawing area 42 through the bypass pipeline.

In the invention, the high-temperature and high-pressure gas in the compressor 10 can flow into the unfreezing zone 42 through the bypass pipeline, so that the temperature in the unfreezing zone 42 is raised, the purpose of unfreezing is achieved, and the cooled gas after unfreezing can return to the compressor 10 through the outlet of the unfreezing zone 42 and the bypass pipeline for recompression, so that the unfreezing is carried out without electric heating, the unfreezing cost can be saved, the unfreezing efficiency can be improved, the unfreezing energy consumption is reduced, and the safety problem caused by electric leakage is avoided.

Optionally, as shown in fig. 1, in the above embodiment, a first bypass valve 01 is disposed on the bypass line at the air outlet of the compressor 10, and the opening degree of the first bypass valve 01 is adjustable.

In the above embodiment, the air conditioner and refrigerator all-in-one machine can control whether the high-temperature high-pressure gaseous refrigerant in the compressor 10 flows to the thawing zone 42 through the bypass pipeline or not by controlling the opening and closing of the first bypass valve 01, and when the first bypass valve 01 is opened, the flow of the high-temperature high-pressure gaseous refrigerant flowing into the thawing zone 42 can be controlled by controlling the opening degree of the first bypass valve 01, so that the food thawing requirements of different stages can be met, and the energy-saving effect can be achieved according to the change of the heating demand.

Optionally, as shown in fig. 1, a second bypass valve 02 is disposed on a bypass line at the air return port of the compressor 10, and an opening degree of the second bypass valve 02 is adjustable.

In the above embodiment, the flow of the gas in the thawing zone 42 into the compressor 10 can be controlled by controlling the opening and closing of the second bypass valve 02, and the flow of the gas returning from the thawing zone 42 to the compressor 10 can be controlled by controlling the opening degree of the second bypass valve 02, so that not only different food thawing requirements can be satisfied, but also the energy saving effect can be achieved.

Optionally, as shown in fig. 1, a four-way reversing valve 84 is connected between the compressor 10 and the indoor heat exchanger 30 and the outdoor heat exchanger 20, the refrigeration region 41 is connected to a first interface of the four-way reversing valve 84 through a first pipeline, a first end of the indoor heat exchanger 30 is connected to the first interface of the four-way reversing valve 84 through a second pipeline, a sixth pipeline is connected between the outdoor heat exchanger 20 and the indoor heat exchanger 30, a first end of the sixth pipeline is connected to the outdoor heat exchanger 20, a second end of the sixth pipeline is connected to a second end of the indoor heat exchanger 30 through a third pipeline, a second end of the sixth pipeline is connected to the refrigeration region 41 through a fourth pipeline, a first end of the indoor heat exchanger 30 is connected to a second interface of the four-way reversing valve through a fifth pipeline, the first pipeline is provided with a first control valve 1, the second pipeline is provided with a second control valve 2, the third pipeline is provided with a, and a fourth control valve 4 is arranged on the fourth pipeline, a fifth control valve 5 is arranged on the fifth pipeline, and a sixth control valve 6 and a throttling device 60 are arranged on the sixth pipeline.

In the above embodiment, the air conditioner and refrigerator all-in-one machine can control the opening and closing of the indoor heat exchanger 30 by controlling the opening and closing of the second control valve 2, the third control valve 3 and the sixth control valve 6, and can control the switching of the cooling and heating of the indoor heat exchanger 30 by controlling the reversing of the four-way reversing valve 84 during the operation of the indoor heat exchanger 30. By controlling the opening and closing of the first control valve 1, the sixth control valve 6, and the fourth control valve 4, the opening and closing of the refrigerator 40 and the cooling can be controlled. The throttling device 60 may be an electronic expansion valve, a capillary tube, or the like, and is not limited herein as long as the purpose of throttling can be achieved.

Optionally, as shown in fig. 1, a seventh pipeline is further connected to the second end of the indoor heat exchanger 30 of the air conditioner, the other end of the seventh pipeline is connected to the sixth pipeline between the sixth control valve 6 and the throttling device 60, and a seventh control valve 7 is disposed on the seventh pipeline.

In the above embodiment, by opening the first control valve 1, the fourth control valve 4, the fifth control valve 5 and the seventh control valve 7, the indoor heat exchanger and the refrigerator can be opened at the same time, and heating of the indoor heat exchanger and cooling of the refrigerator are realized.

Referring to fig. 1 and 2 in combination, according to an embodiment of the present invention, an operation control method of an air conditioner and refrigerator all-in-one machine is characterized by comprising: starting the air conditioner and refrigerator integrated machine and operating a refrigeration mode; controlling 1/4 the first bypass valve 01 and the second bypass valve 02 to open, so that the bypass pipelines are communicated; controlling the first control valve 1, the fourth control valve 4 and the sixth control valve 6 to be opened, and controlling the second control valve 2, the third control valve 3, the fifth control valve 5 and the seventh control valve 7 to be closed; controlling the compressor 10 to operate at a high frequency to shut down the indoor heat exchanger 30; detecting the temperature of the freezing area 412 and the refrigerating area 411; and controlling the air conditioner and refrigerator integrated machine according to the time when the freezing area 412 and the refrigerating area 411 reach the set temperature.

In the operation process of the air conditioner and refrigerator integrated machine, the high-temperature and high-pressure gaseous refrigerant in the compressor 10 can flow into the unfreezing zone from the exhaust port of the compressor 10 through the bypass pipeline, so that the temperature in the unfreezing zone 42 is raised, the unfreezing purpose is achieved, and the low-temperature and high-pressure gaseous refrigerant cooled after unfreezing returns to the compressor 10 through the unfreezing zone outlet and the bypass pipeline, so that electric heating is not needed for unfreezing, the unfreezing cost can be saved, the unfreezing efficiency can be improved, the unfreezing energy consumption can be reduced, and the safety problem caused by electric leakage.

When the air conditioner and refrigerator integrated machine is started to operate, the indoor heat exchanger 30 is shut down, the first bypass valve 01 and the second bypass valve 02 are opened 1/4, and the compressor 10 operates at high frequency, so that condensation heat release of an air conditioner is divided into two parts, a part of refrigerant is condensed and released in the defrosting area 42 through a bypass pipeline, a part of refrigerant is condensed and released at the outdoor heat exchanger 20, accordingly, the amount of refrigerant entering the outdoor heat exchanger 20 can be reduced, and in order to reduce adverse effects on refrigeration of operation defrosting of the defrosting area 42 on the refrigerator, the control of the first bypass valve 01 and the second bypass valve 02 is a simple and effective method. The opening degrees of the first bypass valve 01 and the second bypass valve 02 are controlled to be 1/4, the flow rate of the refrigerant flowing back from the bypass pipeline can be reduced, the refrigerant still releases heat through the outdoor heat exchanger 20 in a large amount, the freezing area 412 and the refrigerating area 411 of the refrigerator are refrigerated, and the opening degrees of the first bypass valve 01 and the second bypass valve 02 are small, so that the food and the like in the unfreezing area 42 can be unfrozen slowly on the basis of preferentially refrigerating the refrigerator, the influence on the refrigeration of the refrigerator is reduced, and the operation efficiency of the air-conditioning and refrigerator all-in-one machine can be improved.

The step of controlling the air conditioner and refrigerator integrated machine according to the time of reaching the set temperature of the freezing area and the refrigerating area comprises the following steps: when the temperatures of the freezing area 412 and the refrigerating area 411 reach the set temperatures and last for t2 time, the first control valve 1 and the sixth control valve 6 are controlled to be fully opened, the fourth control valve 4 is opened 1/4, the first bypass valve 01 and the second bypass valve 02 are controlled to be fully opened, the second control valve 2, the third control valve 3, the fifth control valve 5 and the seventh control valve 7 are closed, and the compressor 10 operates at high frequency.

When the temperatures of the freezing area 412 and the refrigerating area 411 reach the set temperature and last for t2 time, it is indicated that the temperature of the refrigerating area has stably reached the set temperature, and therefore the temperature requirement of food storage in the refrigerating area 41 of the refrigerator can be ensured, at this time, the first control valve 1 and the sixth control valve 6 are controlled to be fully opened, the fourth control valve 5 is controlled to be opened 1/4, the opening degree of the fourth control valve can be reduced, the heat exchange quantity requirement of the outdoor heat exchanger 20 is reduced, and the refrigerating area 41 is enabled to maintain the refrigerating temperature. When the temperatures of the freezing area 412 and the refrigerating area 411 reach the set temperature and last for t2 time, the food is completely refrigerated or frozen, so that the first bypass valve 01 and the second bypass valve 02 can be controlled to be fully opened, the thawing area 42 is preferentially thawed fully, and meanwhile, the refrigerator is slowly operated to refrigerate, so that the thawing requirements of users are met.

The operation control method further includes: when the temperature of the thawing zone reaches the set temperature T1 and lasts for T1 time, the first control valve 1, the fourth control valve 4 and the sixth control valve 6 are controlled to be opened, the second control valve 2, the third control valve 3, the fifth control valve 4 and the seventh control valve 7 are controlled to be closed, the compressor 10 is controlled to run at high frequency, the first bypass valve 01 and the second bypass valve 02 are controlled to be closed, the indoor heat exchanger is kept to be shut down, and the air-conditioning and refrigerator all-in-one machine is enabled to enter a normal refrigeration state of the refrigerator. When the temperature of the unfreezing zone reaches the set temperature T1 and lasts for T1 time, it is indicated that food in the unfreezing zone is unfrozen, unfreezing of the unfreezing zone 42 can be stopped, and the operation energy efficiency of the air conditioner and refrigerator all-in-one machine is reduced, so that the first bypass valve 01 and the second bypass valve 02 can be closed at the moment, the indoor heat exchanger is kept turned off, the air conditioner and refrigerator all-in-one machine enters a normal refrigerator refrigeration state, and the air conditioner and refrigerator all-in-one machine operates in.

T1 was 20 ℃ and T1 was 10 min.

The step of controlling the air conditioner and refrigerator integrated machine according to the time of the freezing area and the time of the refrigerating area reaching the set temperature further comprises the following steps: when the temperatures of the freezing area 412 and the refrigerating area 411 are detected not to reach the set values or reach the set temperatures but the duration time does not reach the time t2, controlling the first bypass valve 01 and the second bypass valve 02 to open 1/4 so as to enable the bypass pipelines to be communicated; controlling the first control valve 1, the fourth control valve 4 and the sixth control valve 6 to be opened, and controlling the second control valve 2, the third control valve 3, the fifth control valve 5 and the seventh control valve 7 to be closed; the high frequency operation of the compressor 10 is controlled to make the freezing area 412 and the refrigerating area 411 operate for refrigeration, and the unfreezing area 42 operates for slow unfreezing. Where t2 is, for example, 10 ℃.

If the temperatures of the freezing area 412 and the refrigerating area 411 are not adjusted in place or the temperatures reach but the duration time is insufficient, it is indicated that the refrigerating environment of the refrigerating area 41 of the refrigerator is still unstable, at this time, the maximum heat exchange operation of the outdoor heat exchanger 20 should still be kept, so that the temperatures of the freezing area 412 and the refrigerating area 411 can be quickly adjusted in place, the use requirements of users are met, when the temperatures of the freezing area 412 and the refrigerating area 411 are adjusted in place and last for a sufficient time, subsequent adjustment can be continued according to the adjusting mode, and the integrated air-conditioning and refrigerator can be ensured to operate in a state with high energy efficiency.

Of course, the above operation parameter values are all exemplified and do not limit the scheme of the present invention, and these parameters can be adjusted according to the operation conditions of the air-conditioning and refrigerator all-in-one machine, so that the air-conditioning and refrigerator all-in-one machine can operate at higher energy efficiency.

It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. The operation control method of the air conditioner and refrigerator all-in-one machine is characterized in that the air conditioner and refrigerator all-in-one machine comprises a compressor, an outdoor heat exchanger, a four-way reversing valve, an indoor heat exchanger and a refrigerator, wherein the refrigerator comprises a refrigerating area and a unfreezing area, and the refrigerating area comprises a freezing area and a refrigerating area; a bypass pipeline is connected between the compressor and the thawing zone, an exhaust port of the compressor is connected to an inlet of the thawing zone through the bypass pipeline, and a gas return port of the compressor is connected to an outlet of the thawing zone through the bypass pipeline; the four-way reversing valve is connected between the compressor and the indoor heat exchanger as well as between the compressor and the outdoor heat exchanger, the refrigeration area is connected to a first interface of the four-way reversing valve through a first pipeline, a first end of the indoor heat exchanger is connected to the first interface of the four-way reversing valve through a second pipeline, a sixth pipeline is connected between the outdoor heat exchanger and the indoor heat exchanger, a first end of the sixth pipeline is connected to the outdoor heat exchanger, a second end of the sixth pipeline is connected to a second end of the indoor heat exchanger through a third pipeline, a second end of the sixth pipeline is connected to the refrigeration area through a fourth pipeline, a first end of the indoor heat exchanger is connected to a second interface of the four-way reversing valve through a fifth pipeline, a first control valve is arranged on the first pipeline, a second control valve is arranged on the second pipeline, and a third control valve is arranged on the third pipeline, a fourth control valve is arranged on the fourth pipeline, a fifth control valve is arranged on the fifth pipeline, and a sixth control valve and a throttling device are arranged on the sixth pipeline; the second end of the indoor heat exchanger is also connected with a seventh pipeline, the other end of the seventh pipeline is connected with a sixth pipeline between a sixth control valve and the throttling device, and the seventh pipeline is provided with a seventh control valve; wherein the indoor heat exchanger and the refrigerator are turned on when the first control valve, the fourth control valve, the fifth control valve, and the seventh control valve are opened; a first bypass valve is arranged on a bypass pipeline at an air outlet of the compressor, and the opening degree of the first bypass valve is adjustable; a bypass pipeline at an air return port of the compressor is provided with a second bypass valve, and the opening degree of the second bypass valve is adjustable;

the operation control method comprises the following steps:

starting the air conditioner and refrigerator all-in-one machine and operating a refrigeration mode;

controlling 1/4 the first and second bypass valves open to communicate the bypass line;

controlling the first control valve, the fourth control valve and the sixth control valve to be opened, and controlling the second control valve, the third control valve, the fifth control valve and the seventh control valve to be closed;

controlling the compressor to run at a high frequency to shut down the indoor heat exchanger;

detecting the temperature of the freezing area and the refrigerating area;

and controlling the air-conditioning and refrigerator all-in-one machine according to the time for the freezing area and the refrigerating area to reach the set refrigerating temperature of the refrigerator.

2. The operation control method according to claim 1, wherein the step of controlling the all-in-one air conditioner-refrigerator according to the time for the freezing area and the refrigerating area to reach the refrigerating set temperature of the refrigerator comprises the steps of:

when the temperatures of the freezing area and the refrigerating area reach the set refrigeration temperature of the refrigerator and last for t2 time, the first control valve and the sixth control valve are controlled to be fully opened, the fourth control valve is opened 1/4, the first bypass valve and the second bypass valve are controlled to be fully opened, the second control valve, the third control valve, the fifth control valve and the seventh control valve are closed, and the compressor operates at high frequency.

3. The operation control method according to claim 2, characterized by further comprising:

when the temperature of the unfreezing area reaches the unfreezing set temperature T1 of the refrigerator and lasts for T1 time, the first control valve, the fourth control valve and the sixth control valve are controlled to be opened, the second control valve, the third control valve, the fifth control valve and the seventh control valve are controlled to be closed, the first bypass valve and the second bypass valve are controlled to be closed, the compressor is controlled to run at high frequency, the indoor heat exchanger is kept to be shut down, and the air-conditioning and refrigerator all-in-one machine is enabled to enter a normal refrigeration state of the refrigerator.

4. The operation control method according to claim 3, wherein T1 is 20 ℃ and T1 is 10 min.

5. The operation control method according to claim 1, wherein the step of controlling the all-in-one air conditioner-refrigerator according to the time for the freezing area and the refrigerating area to reach the refrigerating set temperature of the refrigerator further comprises:

when the temperature of the freezing area and the temperature of the refrigerating area do not reach the set refrigerating temperature of the refrigerator or reach the set refrigerating temperature of the refrigerator but the duration time does not reach t2 time, controlling the first bypass valve and the second bypass valve to be opened 1/4 so as to enable a bypass pipeline to be communicated;

and controlling the high-frequency operation of the compressor to enable the freezing area and the refrigerating area to operate and refrigerate, and enable the unfreezing area to operate and unfreeze.