Control Method, Device, Refrigeration System and Air Conditioning Equipment of a Refrigeration System

Abstract

The present invention discloses a control method, device, refrigeration system and air-conditioning equipment for a refrigeration system, which relates to the field of air-conditioning technology and solves the technical problems in the prior art that when a variable frequency condensing unit operates in a thermal fluorine defrosting mode, the drive plate of the compressor has a safety hazard of generating condensation, and the unit may be shut down for protection in the late stage of defrosting. The control method of the refrigeration system of the present invention comprises the following steps: obtaining the operating mode of the refrigeration system; based on the operating mode of the refrigeration system, controlling the connectivity status of each interface in the first four-way reversing valve and the second four-way reversing valve, and making the drive plate of the compressor in a non-condensing state and the refrigeration system in a non-protective shutdown state during the defrosting period. The control method of the refrigeration system of the present invention can make the drive plate of the compressor dissipate heat normally when the refrigeration system operates in a defrosting mode, avoiding the drive plate from being in a non-condensing state; and can also avoid the unit being shut down for protection due to excessive refrigerant in the evaporator.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method and device for a refrigeration system, a refrigeration system and air conditioning equipment. Background Art

[0002] At present, variable frequency condensing units usually use liquid cooling plate pipelines to dissipate heat from the compressor drive plate to ensure the reliable operation of the variable frequency compressor. Figure 1 The schematic diagram of the existing variable frequency condensing unit is shown in FIG. Figure 1 As shown, the variable frequency condensing unit includes a compressor 1, a condenser 2, a liquid reservoir 3, a drying filter 4, a liquid cooling plate pipeline 5, an electronic expansion valve 6, an evaporator 7, a gas-liquid separator 8 and a first four-way valve 9. The air outlet of the compressor 1, the D1C1 interface of the first four-way valve 9, the condenser 2, the liquid reservoir 3, the drying filter 4, the liquid cooling plate pipeline 5, the electronic expansion valve 6, the evaporator 7, the E1S1 interface of the first four-way valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant circulation loop. Specifically, the liquid cooling plate pipeline 5 is a copper tube, and the liquid cooling plate pipeline 5 is in contact with the drive plate of the compressor 1. The temperature of the liquid refrigerant on the high-pressure side flowing through the liquid cooling plate pipeline 5 is 10-60°C, while the temperature of the drive plate of the compressor 1 can reach 100°C. The refrigerant flowing through the liquid cooling plate pipeline 5 is used for heat exchange with the drive plate of the compressor 1. The heat of the drive plate is taken away by the refrigerant, which can reduce the temperature of the drive plate of the compressor 1, thereby ensuring the reliable operation of the compressor 1.

[0003] See again Figure 1 When the variable frequency condensing unit operates in cooling mode, the liquid cooling plate pipeline 5 is located in front of the electronic expansion valve 6, and the temperature of the refrigerant flowing through the liquid cooling plate pipeline 5 is 10-60°C. The liquid cooling plate pipeline 5 can normally dissipate heat for the driver board of the compressor 1; however, when the variable frequency condensing unit operates in hot fluorine defrosting mode, the D1 and E1 interfaces of the first four-way valve 9 are connected, and the C1 and S1 interfaces are connected. The refrigerant flowing out of the air outlet of the compressor 1 is reversed, and the refrigerant circulates in reverse. At this time, the liquid cooling plate pipeline 5 is located behind the electronic expansion valve 6. The temperature of the refrigerant after throttling by the electronic expansion valve 6 drops to about -30°C. If such a low-temperature refrigerant is used to dissipate heat for the driver board of the compressor 1, there is a safety hazard of condensation on the driver board, thereby affecting the safety of the electrical appliance.

[0004] On the other hand, when the variable frequency condensing unit operates in the refrigeration mode, the condenser 2 is connected to the liquid reservoir 3. When the refrigerant circulation volume of the variable frequency condensing unit is small, the refrigerant that does not participate in the refrigeration cycle can be stored in the liquid reservoir 3 to avoid the unit from being shut down for protection; however, when the variable frequency condensing unit operates in the hot fluorine defrosting mode, the refrigerant is reversely circulated, and the refrigerant flowing out of the compressor 1 first flows through the evaporator 7. At this time, the liquid reservoir 3 is located behind the electronic expansion valve 6, and the liquid reservoir 3 is not connected to the evaporator 7. In the later stage of defrosting, when the refrigerant circulation volume required by the unit is small, a large amount of refrigerant that does not participate in the circulation will remain in the evaporator 7, and the unit may be shut down for protection, thereby affecting the defrosting effect of the unit.

[0005] Therefore, in order to improve the reliability of the unit's operation in defrost mode, improving the structure and control method of the existing variable frequency condensing unit has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0006] One of the objectives of the present invention is to provide a refrigeration system control method that addresses the safety hazard of condensation on the compressor drive plate when operating a variable-frequency condensing unit in a thermal fluorine defrost mode, as well as the potential for the unit to shut down for protection during late defrost cycles. The various technical benefits of the preferred technical solution of the present invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] The control method of the refrigeration system of the present invention comprises the following steps:

[0009] Obtaining an operating mode of the refrigeration system;

[0010] Based on the operating mode of the refrigeration system, the connectivity status of each interface in the first four-way reversing valve and the second four-way reversing valve is controlled, and during the defrosting period of the refrigeration system, the drive plate of the compressor is in a non-condensing state and the refrigeration system is in a non-protective shutdown state.

[0011] According to a preferred embodiment, when the refrigeration system operates in refrigeration mode, the C1 interface and the D1 interface of the first four-way reversing valve are controlled to be connected, and the E1 interface and the S1 interface are controlled to be connected, and the C2 interface and the D2 interface of the second four-way reversing valve are controlled to be connected, and the E2 interface and the S2 interface are controlled to be connected.

[0012] According to a preferred embodiment, when the refrigeration system operates in defrost mode, the C1 interface and the S1 interface of the first four-way reversing valve are controlled to be connected, and the D1 interface and the E1 interface are controlled to be connected, and the control method also includes the following steps: based on the storage temperature during the refrigeration mode operation of the refrigeration system before defrosting and the current defrosting time, the connectivity status of each interface of the second four-way reversing valve and the opening of the electronic expansion valve are controlled.

[0013] According to a preferred embodiment, when the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet the following conditions: T≤T k , t≤t2 or T>T k When t≤t1, the C2 interface and D2 interface of the second four-way reversing valve are controlled to be connected, and the E2 interface and S2 interface are controlled to be connected, and the electronic expansion valve is controlled to operate according to the maximum number of steps; when the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet: T≤T k , t>t2 or T>T k When t>t1, the C2 interface and S2 interface of the second four-way reversing valve are controlled to be connected, and the D2 interface and E2 interface are controlled to be connected, and the electronic expansion valve is controlled to operate according to the preset number of steps; wherein T is the storage temperature during the refrigeration mode of the refrigeration system before defrosting, T k is the preset temperature; t is the current defrosting time, t1 is the first preset time, t2 is the second preset time, and t1<t2.

[0014] The control method of the refrigeration system provided by the present invention has at least the following beneficial technical effects:

[0015] The control method of the refrigeration system of the present invention obtains the operating mode of the refrigeration system; based on the operating mode of the refrigeration system, controls the connectivity of each interface in the first four-way reversing valve and the second four-way reversing valve, and makes the refrigeration system in the defrosting period, the compressor drive plate is in a non-condensing state and the refrigeration system is in a non-protective shutdown state. On the one hand, it can ensure that the refrigeration system operates normally in the refrigeration mode to provide cold air indoors; on the other hand, when the refrigeration system operates in the defrosting mode, by controlling the connectivity of each interface in the first four-way reversing valve and the second four-way reversing valve, the compressor drive plate can be properly dissipated to avoid the drive plate being in a non-condensing state, thereby ensuring the reliability of the refrigeration system in the defrosting mode; at the same time, it can also avoid the unit shutdown protection caused by excessive refrigerant in the evaporator, thereby further ensuring the reliability of the refrigeration system in the defrosting mode. That is, the control method of the refrigeration system of the present invention solves the technical problems in the prior art of the variable frequency condensing unit operating in the hot fluorine defrosting mode, such as the safety hazard of condensation on the compressor drive plate, and the possible shutdown protection of the unit in the late defrosting period.

[0016] A second object of the present invention is to provide a control device for a refrigeration system.

[0017] The control device of the refrigeration system of the present invention includes an acquisition module and a control module, wherein the acquisition module is used to obtain the operating mode of the refrigeration system; the control module is used to control the connectivity status of each interface in the first four-way reversing valve and the second four-way reversing valve based on the operating mode of the refrigeration system, and to ensure that the drive plate of the compressor of the refrigeration system is in a non-condensing state and the refrigeration system is in a non-protective shutdown state during the defrosting period.

[0018] The control device for a refrigeration system provided by the present invention has at least the following beneficial technical effects:

[0019] The control device of the refrigeration system of the present invention includes an acquisition module and a control module. Through the functions of the acquisition module and the control module, on the one hand, the refrigeration system can be guaranteed to operate normally in the refrigeration mode to provide cold air indoors; on the other hand, when the refrigeration system operates in the defrost mode, the drive plate of the compressor can be normally dissipated to avoid the drive plate being in a non-condensing state, thereby ensuring the reliability of the refrigeration system operating in the defrost mode; at the same time, it can also avoid excessive refrigerant in the evaporator causing the unit to shut down for protection, thereby further ensuring the reliability of the refrigeration system operating in the defrost mode.

[0020] The third object of the present invention is to provide a refrigeration system.

[0021] The refrigeration system of the present invention includes a refrigerant circuit formed by connecting a compressor outlet, a condenser, a liquid reservoir, a drying filter, a liquid cold plate pipeline, an electronic expansion valve, an evaporator, a gas-liquid separator and a compressor return port in sequence. The refrigeration system also includes a first four-way reversing valve, a second four-way reversing valve and a controller, wherein the first four-way reversing valve is arranged at the air outlet of the compressor, and the second four-way reversing valve is arranged at the inlet of the liquid reservoir. The controller is connected to the first four-way reversing valve, the second four-way reversing valve and the electronic expansion valve, and the controller is used to execute an executable program to implement the steps of the control method described in any technical solution of the present invention.

[0022] According to a preferred embodiment, when the C1 interface and the D1 interface of the first four-way reversing valve are connected, the E1 interface and the S1 interface are connected, the C2 interface and the D2 interface of the second four-way reversing valve are connected, the S2 interface and the E2 interface are connected, and the electronic expansion valve is in a preset step state, the air outlet of the compressor, the D1C1 passage of the first four-way reversing valve, the condenser, the S2E2 passage of the second four-way reversing valve, the liquid reservoir, the drying filter, the liquid cold plate pipeline, the electronic expansion valve, the C2D2 passage of the second four-way reversing valve, the evaporator, the E1S1 passage of the first four-way reversing valve, the gas-liquid separator and the return air port of the compressor are connected in sequence to form a refrigerant circulation flow path.

[0023] According to a preferred embodiment, when the C1 interface and the S1 interface of the first four-way reversing valve are connected, the D1 interface and the E1 interface are connected, the D2 interface and the C2 interface of the second four-way reversing valve are connected, the E2 interface and the S2 interface are connected, and the electronic expansion valve is in the maximum step state, the air outlet of the compressor, the D1E1 passage of the first four-way reversing valve, the evaporator, the D2C2 passage of the second four-way reversing valve, the electronic expansion valve, the liquid cooling plate pipeline, the drying filter, the liquid reservoir, the E2S2 passage of the second four-way reversing valve, the condenser, the C1S1 passage of the first four-way reversing valve, the gas-liquid separator and the return air port of the compressor are connected in sequence to form a refrigerant circulation flow path.

[0024] According to a preferred embodiment, when the C1 interface and the S1 interface of the first four-way reversing valve are connected, the D1 interface and the E1 interface are connected, the C2 interface and the S2 interface of the second four-way reversing valve are connected, the E2 interface and the D2 interface are connected, and the electronic expansion valve is in a preset step state, the air outlet of the compressor, the D1E1 passage of the first four-way reversing valve, the evaporator, the D2E2 passage of the second four-way reversing valve, the liquid reservoir, the drying filter, the liquid cooling plate pipeline, the electronic expansion valve, the C2S2 passage of the second four-way reversing valve, the condenser, the C1S1 passage of the first four-way reversing valve, the gas-liquid separator and the return air port of the compressor are connected in sequence to form a refrigerant circulation flow path.

[0025] The refrigeration system provided by the present invention has at least the following beneficial technical effects:

[0026] In the refrigeration system of the present invention, the controller is connected to the first four-way reversing valve, the second four-way reversing valve and the electronic expansion valve, and the controller is used to execute an executable program to implement the steps of the control method of any technical solution in the present invention, which not only enables the refrigeration system to operate normally in the refrigeration mode to provide cold air indoors; on the other hand, when the refrigeration system operates in the defrost mode, the compressor drive plate can also dissipate heat normally to avoid the drive plate being in a non-condensing state, thereby ensuring the reliability of the refrigeration system operating in the defrost mode; at the same time, it can also avoid excessive refrigerant in the evaporator causing the unit to shut down for protection, thereby further ensuring the reliability of the refrigeration system operating in the defrost mode.

[0027] A fourth object of the present invention is to provide an air conditioning device.

[0028] The air-conditioning equipment of the present invention includes the refrigeration system described in any one of the technical solutions of the present invention.

[0029] The air conditioning equipment provided by the present invention has at least the following beneficial technical effects:

[0030] The air-conditioning device of the present invention includes the refrigeration system of any one of the technical solutions of the present invention. Since the reliability of the refrigeration system in the defrost mode is improved, the reliability of the operation of the air-conditioning device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of a refrigeration system in the prior art;

[0033] Figure 2 is a flow chart of a preferred embodiment of a control method for a refrigeration system of the present invention;

[0034] Figure 3 is a schematic diagram of a preferred embodiment of the refrigeration system of the present invention;

[0035] Figure 4 Schematic diagram of the refrigerant flow direction when the refrigeration system of the present invention operates in refrigeration mode;

[0036] Figure 5 Schematic diagram of the first flow direction of the refrigerant when the refrigeration system of the present invention operates in the defrost mode;

[0037] Figure 6 Schematic diagram of the second flow direction of the refrigerant when the refrigeration system of the present invention operates in the defrost mode;

[0038] Figure 7 It is a module diagram of a preferred embodiment of the control device of the refrigeration system of the present invention.

[0039] In the figure: 1. Compressor; 2. Condenser; 3. Liquid reservoir; 4. Dry filter; 5. Liquid cooling plate pipeline; 6. Electronic expansion valve; 7. Evaporator; 8. Gas-liquid separator; 9. First four-way reversing valve; 10. Second four-way reversing valve; 100. Acquisition module; 200. Control module. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0041] The following is attached with the instruction manual Figures 2 to 7 And embodiments 1 to 4 describe in detail the control method, device, refrigeration system and air-conditioning equipment of the present invention.

[0042] Example 1

[0043] This embodiment describes in detail the control method of the refrigeration system of the present invention.

[0044] Figure 2 FIG. 1 is a flow chart showing a control method for a refrigeration system according to this embodiment. Figure 2 As shown, the control method of the refrigeration system of this embodiment includes the following steps:

[0045] Step 1: Obtain the operating mode of the refrigeration system. Preferably, the operating mode of the refrigeration system includes a refrigeration mode and a defrost mode. Preferably, the operating mode of the refrigeration system can be manually input by the user, or the refrigeration system can automatically switch based on the frosting condition of the evaporator 7.

[0046] Step 2: Based on the operating mode of the refrigeration system, control the connectivity status of each interface in the first four-way reversing valve 9 and the second four-way reversing valve 10, and make the drive plate of the compressor 1 in a non-condensing state and the refrigeration system in a non-protective shutdown state during the defrosting period.

[0047] The control method of the refrigeration system of this embodiment obtains the operating mode of the refrigeration system; based on the operating mode of the refrigeration system, controls the connection status of each interface in the first four-way reversing valve 9 and the second four-way reversing valve 10, and makes the drive plate of the compressor 1 in a non-condensing state and the refrigeration system in a non-protective shutdown state during the defrosting period. On the one hand, it can ensure that the refrigeration system operates normally in the refrigeration mode to provide cold air indoors; on the other hand, when the refrigeration system operates in the defrosting mode, by controlling the connection status of each interface in the first four-way reversing valve 9 and the second four-way reversing valve 10, the drive plate of the compressor 1 can be properly dissipated to avoid the drive plate being in a non-condensing state, thereby ensuring the reliability of the refrigeration system in the defrosting mode; at the same time, it can also avoid the unit shutdown protection caused by excessive refrigerant in the evaporator 7, thereby further ensuring the reliability of the refrigeration system in the defrosting mode. That is, the control method of the refrigeration system of this embodiment solves the technical problems of the prior art that when the variable frequency condensing unit operates in the hot fluorine defrosting mode, the compressor drive plate may produce condensation, and the unit may be shut down for protection in the late stage of defrosting.

[0048] According to a preferred embodiment, when the refrigeration system operates in refrigeration mode, the C1 interface and the D1 interface of the first four-way reversing valve 9 are controlled to be connected, and the E1 interface and the S1 interface are connected; the C2 interface and the D2 interface of the second four-way reversing valve 10 are controlled to be connected, and the E2 interface and the S2 interface are connected. The control method of the refrigeration system of the preferred technical solution of this embodiment is that when the refrigeration system operates in the refrigeration mode, the C1 interface and the D1 interface of the first four-way reversing valve 9 are controlled to be connected, the E1 interface and the S1 interface are connected, and the C2 interface and the D2 interface of the second four-way reversing valve 10 are controlled to be connected, and the E2 interface and the S2 interface are connected, so that the air outlet of the compressor 1, the D1C1 passage of the first four-way reversing valve 9, the condenser 2, the S2E2 passage of the second four-way reversing valve 10, the liquid reservoir 3, the drying filter 4, the liquid cooling plate pipeline 5, the electronic expansion valve 6, the C2D2 passage of the second four-way reversing valve 10, the evaporator 7, the E1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 can be connected in sequence to form a refrigerant circulation flow path. At this time, the liquid cooling plate pipeline 5 is located before the electronic expansion valve 6, and the refrigerant temperature flowing through the liquid cooling plate pipeline 5 is relatively high. The drive plate of the compressor 1 can dissipate heat normally, no condensation occurs, and the refrigeration system operates reliably. Figure 4 The diagram shows the refrigerant flow direction when the refrigeration system is running in the cooling mode. Figure 4 Indicated by the arrow.

[0049] According to a preferred embodiment, when the refrigeration system operates in the defrost mode, the C1 interface and the S1 interface of the first four-way reversing valve 9 are controlled to be connected, and the D1 interface and the E1 interface are connected, and the control method also includes the following steps: based on the storage temperature during the refrigeration mode operation of the refrigeration system before defrosting and the current defrosting time, the connectivity status of each interface of the second four-way reversing valve 10 and the opening of the electronic expansion valve 6 are controlled. The preferred technical solution of the present embodiment is a control method for the refrigeration system. When the refrigeration system operates in the defrost mode, the C1 interface and the S1 interface of the first four-way reversing valve 9 are controlled to be connected, and the D1 interface and the E1 interface are controlled to be connected, so that the refrigerant flowing out of the air outlet of the compressor 1 is reversed and the refrigerant is reversed, so that the high-temperature refrigerant flowing out of the air outlet of the compressor 1 can be used to defrost the evaporator 7; at the same time, the control method of the preferred technical solution of the present embodiment also controls the connectivity status of each interface of the second four-way reversing valve 10 and the opening degree of the electronic expansion valve 6 based on the storage temperature during the refrigeration mode operation of the refrigeration system before defrosting and the current defrosting time, so that the connectivity status of each interface of the second four-way reversing valve 10 and the opening degree of the electronic expansion valve 6 can be controlled by judging the refrigerant running amount, so as to ensure that the drive plate of the compressor 1 is in a non-condensing state during the defrost period and the refrigeration system is in a non-protective shutdown state, thereby ensuring the reliability of the refrigeration system operating in the defrost mode.

[0050] Preferably, when the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet the following conditions: T≤T k, t≤t2 or T>T k When t≤t1, the C2 interface and D2 interface of the second four-way reversing valve 10 are connected, and the E2 interface and S2 interface are connected, and the electronic expansion valve 6 is controlled to operate according to the maximum number of steps; when the storage temperature and defrost time during the refrigeration mode of the refrigeration system before defrosting meet: T≤T k , t>t2 or T>T k When t>t1, the C2 interface and S2 interface of the second four-way reversing valve 10 are connected, and the D2 interface and E2 interface are connected, and the electronic expansion valve 6 is controlled to operate according to the preset number of steps; wherein T is the storage temperature during the refrigeration mode of the refrigeration system before defrosting, T k is the preset temperature; t is the current defrosting time, t1 is the first preset time, t2 is the second preset time, and t1 < t2. Specifically, T k For example, if the temperature is 18°C, t1 is 30-40 minutes, and t2 is 90-100 minutes. If the temperature is high before defrosting, the amount of frost on the refrigeration system is small, and the overall defrosting time is short. If the temperature is low before defrosting, the amount of frost on the refrigeration system is large, and the overall defrosting time is long.

[0051] The preferred technical solution of the refrigeration system control method of this embodiment is that when the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet the following conditions: T≤T k , t≤t2 or T>T k When t≤t1, the C2 interface and D2 interface of the second four-way reversing valve 10 are controlled to be connected, and the E2 interface and S2 interface are controlled to be connected, and the electronic expansion valve 6 is controlled to operate according to the maximum number of steps, so that the air outlet of the compressor 1, the D1E1 path of the first four-way reversing valve 9, the evaporator 7, the D2C2 path of the second four-way reversing valve 10, the electronic expansion valve 6, the liquid cooling plate pipeline 5, the drying filter 4, the liquid storage 3, the E2S2 path of the second four-way reversing valve 10, the condenser 2, the C1S1 path of the first four-way reversing valve 9 The gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant circulation flow path. Although the liquid cooling plate pipeline 5 is located after the electronic expansion valve 6 at this time, since the electronic expansion valve 6 operates at the maximum number of steps, the refrigerant flowing through the electronic expansion valve 6 is basically not throttled. At this time, the refrigerant temperature flowing through the liquid cooling plate pipeline 5 is relatively high, the driving board of the compressor 1 can dissipate heat normally, no condensation occurs, and the refrigeration system operates reliably. On the other hand, when the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet the following conditions: T≤T k , t≤t2 or T>T k When t≤t1, the defrost mode is in the early and middle stages, there is a large amount of frost on the evaporator 7 and a large amount of refrigerant in operation. At this time, the refrigeration system operates normally and there is no protection shutdown phenomenon. Figure 5The diagram shows the refrigerant flow direction when the refrigeration system is in defrost mode (before or after defrost). Figure 5 Indicated by the arrow.

[0052] The preferred technical solution of the refrigeration system control method of this embodiment is that when the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet the following conditions: T≤T k , t>t2 or T>T k When t>t1, the C2 interface and the S2 interface of the second four-way reversing valve 10 are controlled to be connected, and the D2 interface and the E2 interface are controlled to be connected, and the electronic expansion valve 6 is controlled to operate according to a preset number of steps (the preset number of steps is, for example, the number of steps required for the electronic expansion valve 6 to throttle the refrigerant), so that the air outlet of the compressor 1, the D1E1 passage of the first four-way reversing valve 9, the evaporator 7, the D2E2 passage of the second four-way reversing valve 10, the liquid reservoir 3, the drying filter 4, the liquid cooling plate pipeline 5, the electronic expansion valve 6, the second The C2S2 passage of the four-way reversing valve 10, the condenser 2, the C1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant circulation flow path. At this time, the liquid cooling plate pipeline 5 is located before the electronic expansion valve 6. The refrigerant temperature flowing through the liquid cooling plate pipeline 5 is relatively high, and the driving plate of the compressor 1 can dissipate heat normally without condensation, and the refrigeration system operates reliably. On the other hand, the storage temperature and defrost time during the refrigeration mode of the refrigeration system before defrosting meet the following requirements: T≤T k , t>t2 or T>T k When t>t1, the defrost mode is in the later stage, the frost layer on the evaporator 7 is small, and the amount of running refrigerant is small. At this time, the liquid reservoir 3 is connected to the evaporator 7 and is located before the electronic expansion valve 6. More refrigerant can be stored in the liquid reservoir 3, avoiding high-pressure shutdown caused by excessive storage of refrigerant in the evaporator 7, thereby ensuring reliable defrosting operation of the refrigeration system. Figure 6 The diagram shows the refrigerant flow direction when the refrigeration system is in defrost mode (late defrost stage). Figure 6 Indicated by the arrow.

[0053] Example 2

[0054] This embodiment describes in detail the control device of the refrigeration system of the present invention.

[0055] The control device of the refrigeration system in this embodiment includes an acquisition module 100 and a control module 200. Figure 7 Preferably, the acquisition module 100 is used to acquire the operating mode of the refrigeration system; the control module 200 is used to control the connectivity of the interfaces in the first four-way reversing valve 9 and the second four-way reversing valve 10 based on the operating mode of the refrigeration system, and to ensure that the drive plate of the compressor 1 is in a non-condensing state and the refrigeration system is in a non-protection shutdown state during the defrosting period.

[0056] Preferably, the method for obtaining the refrigeration system operating mode by the acquisition module 100 can refer to the method in Example 1, which will not be repeated here.

[0057] Preferably, the method for the control module 200 to control the connection status of each interface in the first four-way reversing valve 9 and the second four-way reversing valve 10 can refer to the method in Example 1, which will not be repeated here.

[0058] The control device of the refrigeration system of this embodiment includes an acquisition module 100 and a control module 200. Through the functions of the acquisition module 100 and the control module 200, on the one hand, the refrigeration system can be guaranteed to operate normally in the refrigeration mode to provide cold air indoors; on the other hand, when the refrigeration system operates in the defrost mode, the drive plate of the compressor can be normally dissipated to avoid the drive plate being in a non-condensing state, thereby ensuring the reliability of the refrigeration system operating in the defrost mode; at the same time, it can also avoid excessive refrigerant in the evaporator causing the unit to shut down for protection, thereby further ensuring the reliability of the refrigeration system operating in the defrost mode.

[0059] Example 3

[0060] This embodiment describes the refrigeration system of the present invention in detail.

[0061] The refrigeration system of this embodiment includes a refrigerant circuit formed by sequentially connecting the air outlet of the compressor 1, the condenser 2, the liquid reservoir 3, the drying filter 4, the liquid cold plate pipeline 5, the electronic expansion valve 6, the evaporator 7, the gas-liquid separator 8 and the return air port of the compressor 1. The refrigeration system also includes a first four-way reversing valve 9, a second four-way reversing valve 10 and a controller, wherein the first four-way reversing valve 9 is arranged at the air outlet of the compressor 1, and the second four-way reversing valve 10 is arranged at the inlet of the liquid reservoir 3. The controller is connected to the first four-way reversing valve 9, the second four-way reversing valve 10 and the electronic expansion valve 6, and the controller is used to execute an executable program to implement the steps of the control method of any one of the technical methods in Example 1, such as Figure 3 shown.

[0062] In the refrigeration system of this embodiment, the controller is connected to the first four-way reversing valve 9, the second four-way reversing valve 10 and the electronic expansion valve 6, and the controller is used to execute an executable program to implement the steps of the control method of any technical solution in this embodiment, which not only enables the refrigeration system to operate normally in the refrigeration mode to provide cold air indoors; on the other hand, when the refrigeration system operates in the defrost mode, it can also enable the drive plate of the compressor 1 to dissipate heat normally to avoid the drive plate being in a non-condensing state, thereby ensuring the reliability of the refrigeration system operating in the defrost mode; at the same time, it can also avoid excessive refrigerant in the evaporator 7 causing the unit to shut down for protection, thereby further ensuring the reliability of the refrigeration system operating in the defrost mode.

[0063] According to a preferred embodiment, when the C1 interface and the D1 interface of the first four-way reversing valve 9 are connected, the E1 interface and the S1 interface are connected, the C2 interface and the D2 interface of the second four-way reversing valve 10 are connected, the S2 interface and the E2 interface are connected, and the electronic expansion valve 6 is in a preset step state, the air outlet of the compressor 1, the D1C1 passage of the first four-way reversing valve 9, the condenser 2, the S2E2 passage of the second four-way reversing valve 10, the liquid reservoir 3, the drying filter 4, the liquid cooling plate pipeline 5, the electronic expansion valve 6, the C2D2 passage of the second four-way reversing valve 10, the evaporator 7, the E1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant circulation flow path, as shown in FIG. Figure 4 As shown in the preferred technical solution of this embodiment, when the refrigeration system operates in cooling mode, the air outlet of the compressor 1, the D1C1 passage of the first four-way reversing valve 9, the condenser 2, the S2E2 passage of the second four-way reversing valve 10, the liquid reservoir 3, the drying filter 4, the liquid cooling plate pipeline 5, the electronic expansion valve 6, the C2D2 passage of the second four-way reversing valve 10, the evaporator 7, the E1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8, and the return air port of the compressor 1 are sequentially connected to form a refrigerant circulation flow path. At this time, the liquid cooling plate pipeline 5 is located before the electronic expansion valve 6. The refrigerant flowing through the liquid cooling plate pipeline 5 is at a high temperature, the drive board of the compressor 1 can dissipate heat normally, condensation does not occur, and the refrigeration system operates reliably.

[0064] According to a preferred embodiment, when the C1 interface and the S1 interface of the first four-way reversing valve 9 are connected, the D1 interface and the E1 interface are connected, the D2 interface and the C2 interface of the second four-way reversing valve 10 are connected, the E2 interface and the S2 interface are connected, and the electronic expansion valve 6 is in the maximum step state, the air outlet of the compressor 1, the D1E1 passage of the first four-way reversing valve 9, the evaporator 7, the D2C2 passage of the second four-way reversing valve 10, the electronic expansion valve 6, the liquid cold plate pipeline 5, the drying filter 4, the liquid reservoir 3, the E2S2 passage of the second four-way reversing valve 10, the condenser 2, the C1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant circulation flow path, such as Figure 5As shown. The refrigeration system of the preferred technical solution of this embodiment, when the refrigeration system is in the early and middle stages of the defrost mode, the air outlet of the compressor 1, the D1E1 passage of the first four-way reversing valve 9, the evaporator 7, the D2C2 passage of the second four-way reversing valve 10, the electronic expansion valve 6, the liquid cold plate pipeline 5, the drying filter 4, the liquid reservoir 3, the E2S2 passage of the second four-way reversing valve 10, the condenser 2, the C1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant. Circulating flow path, although the liquid cooling plate pipeline 5 is located after the electronic expansion valve 6 at this time, since the electronic expansion valve 6 operates according to the maximum number of steps, the refrigerant flowing through the electronic expansion valve 6 is basically not throttling. At this time, the refrigerant temperature flowing through the liquid cooling plate pipeline 5 is relatively high, and the drive board of the compressor 1 can dissipate heat normally, no condensation will occur, and the refrigeration system can operate reliably; on the other hand, the defrost mode is in the early and middle stages, there is a large frost layer on the evaporator 7, and a large amount of refrigerant is running. At this time, the refrigeration system operates normally and there will be no protection shutdown phenomenon.

[0065] According to a preferred embodiment, when the C1 interface and the S1 interface of the first four-way reversing valve 9 are connected, the D1 interface and the E1 interface are connected, the C2 interface and the S2 interface of the second four-way reversing valve 10 are connected, the E2 interface and the D2 interface are connected, and the electronic expansion valve 6 is in a preset step state, the air outlet of the compressor 1, the D1E1 passage of the first four-way reversing valve 9, the evaporator 7, the D2E2 passage of the second four-way reversing valve 10, the liquid reservoir 3, the drying filter 4, the liquid cooling plate pipeline 5, the electronic expansion valve 6, the C2S2 passage of the second four-way reversing valve 10, the condenser 2, the C1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant circulation flow path, such as Figure 6 As shown. In the refrigeration system of the preferred technical solution of this embodiment, when the refrigeration system is in the late stage of the defrost mode, the air outlet of the compressor 1, the D1E1 passage of the first four-way reversing valve 9, the evaporator 7, the D2E2 passage of the second four-way reversing valve 10, the liquid reservoir 3, the drying filter 4, the liquid cold plate pipeline 5, the electronic expansion valve 6, the C2S2 passage of the second four-way reversing valve 10, the condenser 2, the C1S1 passage of the first four-way reversing valve 9, the gas-liquid separator 8 and the return air port of the compressor 1 are connected in sequence to form a refrigerant circulation flow path. At this time, the liquid The cold plate pipeline 5 is located before the electronic expansion valve 6. The temperature of the refrigerant flowing through the liquid cold plate pipeline 5 is relatively high. The drive plate of the compressor 1 can dissipate heat normally, condensation will not occur, and the refrigeration system can operate reliably. On the other hand, the defrost mode is in the later stage, and there is less frost on the evaporator 7 and the amount of refrigerant in operation is less. At this time, the liquid reservoir 3 is connected to the evaporator 7 and is located before the electronic expansion valve 6. More refrigerant can be stored in the liquid reservoir 3, avoiding high-pressure shutdown caused by excessive storage of refrigerant in the evaporator 7, thereby ensuring reliable defrosting operation of the refrigeration system.

[0066] Example 4

[0067] This embodiment describes the air conditioning device of the present invention in detail.

[0068] The air conditioning device of this embodiment includes the refrigeration system of any one of the technical solutions in Example 3. The remaining structure of the air conditioning device can be the same as that of the prior art and will not be described in detail here. The air conditioning device of this embodiment can be a cooling-only air conditioning device or a cooling and heating air conditioning device.

[0069] The air-conditioning device of this embodiment includes the refrigeration system of any one of the technical solutions in Example 3. Since the reliability of the refrigeration system in the defrost mode is improved, the reliability of the operation of the air-conditioning device can be improved.

[0070] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0071] It should be noted that, in the description of the present invention, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" or "multiple" is at least two.

[0072] It should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. In addition, the "connection" used here may include wireless connection; the wording "and / or" used includes any unit and all combinations of one or more associated listed items.

[0073] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0074] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0075] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0076] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing module, or each unit may exist physically separately, or two or more units may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

[0077] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0078] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0079] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A control method for a refrigeration system, characterized in that: The steps include: Obtaining an operating mode of the refrigeration system; Based on the operating mode of the refrigeration system, the connection state of each interface in the first four-way reversing valve (9) and the second four-way reversing valve (10) is controlled, and during the defrosting period of the refrigeration system, the drive plate of the compressor (1) is in a non-condensing state and the refrigeration system is in a non-protection shutdown state; The refrigeration system comprises a refrigerant circuit formed by sequentially connecting the air outlet of the compressor (1), a condenser (2), a liquid storage device (3), a drying filter (4), a liquid cooling plate pipeline (5), an electronic expansion valve (6), an evaporator (7), a gas-liquid separator (8) and the air return port of the compressor (1). The refrigeration system further comprises a first four-way reversing valve (9), a second four-way reversing valve (10) and a controller, wherein the first four-way reversing valve (9) is arranged at the air outlet of the compressor (1), and the second four-way reversing valve (10) is arranged at the inlet of the liquid accumulator (3). The controller is connected to the first four-way reversing valve (9), the second four-way reversing valve (10) and the electronic expansion valve (6), and the controller is used to execute an executable program to implement the steps of the control method; The C1 interface, D1 interface, E1 interface and S1 interface of the first four-way reversing valve (9) are respectively connected to the condenser (2), the air outlet of the compressor (1), the evaporator (7) and the gas-liquid separator (8); the C2 interface, D2 interface, E2 interface and S2 interface of the second four-way reversing valve (10) are respectively connected to the electronic expansion valve (6), the evaporator (7), the liquid reservoir (3) and the condenser (2).

2. The control method of the refrigeration system according to claim 1, characterized in that: When the refrigeration system operates in refrigeration mode, the C1 interface of the first four-way reversing valve (9) is controlled to be connected to the D1 interface, and the E1 interface is controlled to be connected to the S1 interface, and the C2 interface of the second four-way reversing valve (10) is controlled to be connected to the D2 interface, and the E2 interface is controlled to be connected to the S2 interface.

3. The control method of the refrigeration system according to claim 1, characterized in that: When the refrigeration system operates in defrost mode, the C1 interface and the S1 interface of the first four-way reversing valve (9) are controlled to be connected, and the D1 interface and the E1 interface are controlled to be connected, and the control method further comprises the following steps: The connection state of each interface of the second four-way reversing valve (10) and the opening degree of the electronic expansion valve (6) are controlled based on the storage temperature during the refrigeration mode operation of the refrigeration system before defrosting and the current defrosting time.

4. The control method of the refrigeration system according to claim 3, characterized in that: When the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet the following conditions: T≤T k , t≤t2 or T>T k When t≤t1, the C2 interface and the D2 interface of the second four-way reversing valve (10) are controlled to be connected, and the E2 interface and the S2 interface are controlled to be connected, and the electronic expansion valve (6) is controlled to operate according to the maximum number of steps; When the storage temperature and defrost time of the refrigeration system during the refrigeration mode before defrosting meet the following conditions: T≤T k , t>t2 or T>T k When t>t1, the C2 interface and the S2 interface of the second four-way reversing valve (10) are controlled to be connected, and the D2 interface and the E2 interface are controlled to be connected, and the electronic expansion valve (6) is controlled to operate according to a preset number of steps; Wherein, T is the room temperature during the refrigeration mode of the refrigeration system before defrosting, T k is the preset temperature; t is the current defrosting time, t1 is the first preset time, t2 is the second preset time, and t1<t2.

5. A control device for a refrigeration system, used to execute the control method for a refrigeration system according to any one of claims 1 to 4, characterized in that: It includes an acquisition module (100) and a control module (200), wherein: The acquisition module (100) is used to acquire the operating mode of the refrigeration system; The control module (200) is used to control the connectivity status of each interface in the first four-way reversing valve (9) and the second four-way reversing valve (10) based on the operating mode of the refrigeration system, and to ensure that the drive plate of the compressor (1) is in a non-condensing state and the refrigeration system is in a non-protective shutdown state during the defrosting period of the refrigeration system.

6. A refrigeration system, characterized in that: The invention comprises a refrigerant circuit formed by sequentially connecting the air outlet of a compressor (1), a condenser (2), a liquid storage device (3), a drying filter (4), a liquid cooling plate pipeline (5), an electronic expansion valve (6), an evaporator (7), a gas-liquid separator (8) and an air return port of the compressor (1). The refrigeration system further comprises a first four-way reversing valve (9), a second four-way reversing valve (10) and a controller, wherein the first four-way reversing valve (9) is arranged at the air outlet of the compressor (1), and the second four-way reversing valve (10) is arranged at the inlet of the liquid accumulator (3). The controller is connected to the first four-way reversing valve (9), the second four-way reversing valve (10) and the electronic expansion valve (6), and the controller is used to execute an executable program to implement the steps of the control method according to any one of claims 1 to 4; The C1 interface, D1 interface, E1 interface and S1 interface of the first four-way reversing valve (9) are respectively connected to the condenser (2), the air outlet of the compressor (1), the evaporator (7) and the gas-liquid separator (8); the C2 interface, D2 interface, E2 interface and S2 interface of the second four-way reversing valve (10) are respectively connected to the electronic expansion valve (6), the evaporator (7), the liquid reservoir (3) and the condenser (2).

7. The refrigeration system according to claim 6, characterized in that When the C1 interface and the D1 interface of the first four-way reversing valve (9) are connected, the E1 interface and the S1 interface are connected, the C2 interface and the D2 interface of the second four-way reversing valve (10) are connected, the S2 interface and the E2 interface are connected, and the electronic expansion valve (6) is in the preset step state, The air outlet of the compressor (1), the D1C1 passage of the first four-way reversing valve (9), the condenser (2), the S2E2 passage of the second four-way reversing valve (10), the liquid storage device (3), the drying filter (4), the liquid cooling plate pipeline (5), the electronic expansion valve (6), the C2D2 passage of the second four-way reversing valve (10), the evaporator (7), the E1S1 passage of the first four-way reversing valve (9), the gas-liquid separator (8) and the return air port of the compressor (1) are connected in sequence to form a refrigerant circulation flow path.

8. The refrigeration system according to claim 6, wherein: When the C1 interface and the S1 interface of the first four-way reversing valve (9) are connected, the D1 interface and the E1 interface are connected, the D2 interface and the C2 interface of the second four-way reversing valve (10) are connected, the E2 interface and the S2 interface are connected, and the electronic expansion valve (6) is in the maximum step state, The air outlet of the compressor (1), the D1E1 passage of the first four-way reversing valve (9), the evaporator (7), the D2C2 passage of the second four-way reversing valve (10), the electronic expansion valve (6), the liquid cooling plate pipeline (5), the drying filter (4), the liquid storage tank (3), the E2S2 passage of the second four-way reversing valve (10), the condenser (2), the C1S1 passage of the first four-way reversing valve (9), the gas-liquid separator (8) and the return air port of the compressor (1) are connected in sequence to form a refrigerant circulation flow path.

9. The refrigeration system according to claim 6, characterized in that When the C1 interface and the S1 interface of the first four-way reversing valve (9) are connected, the D1 interface and the E1 interface are connected, the C2 interface and the S2 interface of the second four-way reversing valve (10) are connected, the E2 interface and the D2 interface are connected, and the electronic expansion valve (6) is in the preset step state, The air outlet of the compressor (1), the D1E1 passage of the first four-way reversing valve (9), the evaporator (7), the D2E2 passage of the second four-way reversing valve (10), the liquid storage device (3), the drying filter (4), the liquid cooling plate pipeline (5), the electronic expansion valve (6), the C2S2 passage of the second four-way reversing valve (10), the condenser (2), the C1S1 passage of the first four-way reversing valve (9), the gas-liquid separator (8) and the return air port of the compressor (1) are connected in sequence to form a refrigerant circulation flow path.

10. An air conditioning device, characterized in that: A refrigeration system comprising the refrigeration system according to any one of claims 6 to 9.

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