Cooling method, device and system for air conditioner inverter, and air conditioner equipment

Abstract

This application discloses a cooling method, device, and system for an air conditioning inverter, as well as air conditioning equipment. The system connects a bypass valve and a refrigerant pump to a condenser, and an electronic expansion valve to each of the bypass valve and the refrigerant pump. The bypass valve, refrigerant pump, and electronic expansion valve are then controlled in combination based on the inter-tube pressure differential Ps between the shell and tube of the condenser and the shell and tube of the evaporator, thereby extracting refrigerant from the condenser to cool the inverter module and rectifier module. The combination of the refrigerant pump, bypass pipe, and electronic expansion valve achieves a more efficient integrated cooling solution, eliminating the need for a separate chiller. This addresses the high cost of separately cooling the inverter in related technologies.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and more specifically, to a cooling method, device and system for an air conditioning inverter, and air conditioning equipment. Background Art

[0002] For air conditioning units using inverters, external cooling units are typically used. A photovoltaic direct-drive variable-frequency centrifugal generator system can operate in five power generation modes. The cooling efficiency of the photovoltaic inverter module plays a crucial role in the proper operation of a pure photovoltaic air conditioner in these multiple modes. When the module temperature within the inverter reaches or exceeds national standards, it directly impacts the lifespan and reliability of the inverter. The normal operation of the inverter is a prerequisite for the proper operation of the photovoltaic air conditioner. If the inverter module temperature becomes excessively high during operation, the inverter's internal protection system will fail, causing a sudden drop in load and an emergency shutdown of the photovoltaic air conditioner unit, significantly impacting the long-term operation and reliability of the unit.

[0003] When the photovoltaic air conditioning unit is operating normally, refrigerant can be introduced from the unit side to cool the inverter module. However, in pure photovoltaic power generation mode, the air conditioning unit is not operating and cannot supply refrigerant to cool the inverter rectifier end. A separate cooling machine is often required outside the inverter to cool the inverter rectifier end, and a fin-tube radiator is required to cool the temperature inside the cabinet. The cooling methods are numerous and complex, and the separate cooling machine has the following disadvantages:

[0004] 1) When a cooling machine fails, the entire machine stops working due to a protection mechanism and cannot continue to generate electricity, resulting in waste of the electricity that should be generated;

[0005] 2) Separate cooling machine configuration is costly, complex to install, and difficult to maintain;

[0006] 3) Most coolers are air-cooled and need to be placed outdoors for heat exchange, which often requires long connecting pipes. If the connecting pipes are too long, it will easily lead to the cooling capacity being reduced and the response being delayed;

[0007] 4) The cooling unit is independently controlled, which may lead to a lack of synchronization with the photovoltaic host control.

[0008] 5) The cooling capacity of the cooling unit will be affected by the external ambient temperature. The cooling capacity will decrease as the ambient temperature rises. When the ambient temperature is high, the module temperature cannot be cooled to the normal range, which will lead to over-temperature protection.

[0009] With respect to the technical problem in the above-mentioned related art that it is costly to configure a separate cooler for cooling the frequency converter, no effective solution has been proposed so far. Summary of the Invention

[0010] The embodiments of the present application provide a cooling method, device, system, and air-conditioning equipment for an air-conditioning inverter to solve the technical problem in the related art of high cost of separately configuring a cooling machine for cooling the inverter.

[0011] In order to solve the above technical problems, according to one aspect of an embodiment of the present application, a cooling system of an air-conditioning inverter is provided, including: a condenser, a bypass valve connected to the condenser, a refrigerant pump connected to the condenser, an electronic expansion valve connected to the bypass valve and the refrigerant pump respectively, an inverter module connected to the electronic expansion valve, and a rectifier module connected to the electronic expansion valve; the bypass valve, the refrigerant pump and the electronic expansion valve are used to extract refrigerant from the condenser through combined control to cool the inverter module and the rectifier module.

[0012] Optionally, the electronic expansion valve includes: a first electronic expansion valve connected to the bypass valve and the refrigerant pump respectively, and the first electronic expansion valve is used to control the refrigerant flowing to the inverter module; a second electronic expansion valve connected to the bypass valve and the refrigerant pump respectively, and the second electronic expansion valve is used to control the refrigerant flowing to the rectifier module.

[0013] Optionally, the cooling system further includes: a first cooling pipe, one end of which is connected to the condenser; a second cooling pipe and a third cooling pipe, one end of the second cooling pipe and one end of the third cooling pipe are both connected to the other end of the first cooling pipe, the other end of the second cooling pipe is connected to the bypass valve, and the other end of the third cooling pipe is connected to the refrigerant pump; a fourth cooling pipe and a fifth cooling pipe, one end of the fourth cooling pipe is connected to the bypass valve, and one end of the fifth cooling pipe is connected to the refrigerant pump; a sixth cooling pipe, one end of the sixth cooling pipe is respectively connected to the other end of the fourth cooling pipe and the other end of the fifth cooling pipe; a seventh cooling pipe and an eighth cooling pipe, one end of the seventh cooling pipe and one end of the eighth cooling pipe are both connected to the other end of the sixth cooling pipe, the other end of the seventh cooling pipe is connected to the first electronic expansion valve, and the other end of the eighth cooling pipe is connected to the second electronic expansion valve; a ninth cooling pipe and a tenth cooling pipe, one end of the ninth cooling pipe is connected to the first electronic expansion valve, the other end of the ninth cooling pipe is connected to the inverter module, one end of the tenth cooling pipe is connected to the second electronic expansion valve, and the other end of the tenth cooling pipe is connected to the rectifier module.

[0014] Optionally, when the inter-tube pressure difference Ps between the shell tube of the condenser and the shell tube of the evaporator is not less than the first pressure difference judgment value Py, the refrigerant pump is in a closed state and the bypass valve is in an open state, the refrigerant in the condenser flows through the bypass line where the bypass valve is located, passes through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flows back to the evaporator.

[0015] Optionally, when the inter-tube pressure difference Ps between the shell tube of the condenser and the shell tube of the evaporator is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, the refrigerant pump and the bypass valve are in an open state, and the refrigerant in the condenser flows through the bypass pipeline where the bypass valve is located and the refrigerant pump at the same time, cools the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flows back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py.

[0016] Optionally, when the inter-tube pressure difference Ps between the shell tube of the condenser and the shell tube of the evaporator is less than the second pressure difference judgment value Px, the refrigerant pump is in the open state and the bypass valve is in the closed state, the refrigerant in the condenser flows through the refrigerant pump, passes through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flows back to the evaporator.

[0017] According to another aspect of an embodiment of the present application, a cooling method for an air-conditioning inverter is also provided, including: obtaining an inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator; and performing combined control of a bypass valve, a refrigerant pump, and an electronic expansion valve according to the inter-tube pressure difference Ps to extract refrigerant from the condenser to cool an inverter module and a rectifier module, wherein the bypass valve and the refrigerant pump are both connected to the condenser, and the electronic expansion valve is respectively connected to the bypass valve and the refrigerant pump.

[0018] Optionally, the electronic expansion valve includes a first electronic expansion valve for controlling the refrigerant flowing to the inverter module and a second electronic expansion valve for controlling the refrigerant flowing to the rectifier module, wherein the bypass valve, the refrigerant pump and the electronic expansion valve are combinedly controlled according to the inter-tube pressure difference Ps to extract refrigerant from the condenser to cool the inverter module and the rectifier module, including: when the inter-tube pressure difference Ps is not less than the first pressure difference judgment value Py, closing the refrigerant pump and opening the bypass valve to control the refrigerant in the condenser to flow through the bypass pipeline where the bypass valve is located, cooling the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flowing back to the evaporator; when the inter-tube pressure difference Ps is within the first pressure difference judgment value When the pressure difference between the judgment value Py and the second pressure difference judgment value Px is between the two values, the refrigerant pump and the bypass valve are turned on to control the refrigerant in the condenser to flow through the bypass line where the bypass valve is located and the refrigerant pump at the same time, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py; when the inter-tube pressure difference Ps is less than the second pressure difference judgment value Px, the refrigerant pump is turned on and the bypass valve is closed to control the refrigerant in the condenser to flow through the refrigerant pump, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator.

[0019] Optionally, when the compressor is turned on, the bypass valve, the refrigerant pump, and the electronic expansion valve are controlled in combination according to the inter-pipe pressure differential Ps, including: when the module temperature Tn is greater than the second temperature judgment value T2, the opening of the corresponding electronic expansion valve is reduced by a1% per interval of a specified time length Δs, wherein the module temperature Tn is the temperature of the inverter module or the rectifier module; when the module temperature Tn is between the first temperature judgment value T1 and the second temperature judgment value T2, the opening of the corresponding electronic expansion valve is reduced by a2% per interval of a specified time length Δs, wherein the first temperature judgment value T1 is less than the second temperature judgment value T2, and a2 is greater than 0 and less than a1; when the module temperature Tn is between the first temperature judgment value T1 and the module target temperature Ts, the opening of the corresponding electronic expansion valve is reduced by a3% per interval of a specified time length Δs, wherein the module target temperature Ts is less than the first temperature judgment value T1, and a3 is greater than 0 and less than a2; when the module temperature Tn is not greater than the module target temperature Ts, the opening of the corresponding electronic expansion valve is maintained unchanged.

[0020] Optionally, when the compressor is turned off, the bypass valve, the refrigerant pump and the electronic expansion valve are combined and controlled according to the inter-pipe pressure difference Ps, including: opening the third electronic expansion valve to the maximum, opening the refrigerant pump and closing the bypass valve, opening the first electronic expansion valve and closing the second electronic expansion valve to control the refrigerant in the condenser to be extracted by the refrigerant pump and flow through the first electronic expansion valve to cool the inverter module, and then the refrigerant returns to the evaporator, wherein the third electronic expansion valve is an electronic expansion valve for the refrigerant to flow back to the evaporator midway.

[0021] According to another aspect of an embodiment of the present application, a cooling device of an air-conditioning inverter is also provided, including: an acquisition unit for acquiring an inter-tube pressure difference Ps between the shell tubes of a condenser and the shell tubes of an evaporator; a control unit for performing combined control of a bypass valve, a refrigerant pump, and an electronic expansion valve according to the inter-tube pressure difference Ps, so as to extract refrigerant from the condenser to cool an inverter module and a rectifier module, wherein the bypass valve and the refrigerant pump are connected to the condenser, and the electronic expansion valve is respectively connected to the bypass valve and the refrigerant pump.

[0022] Optionally, the electronic expansion valve includes a first electronic expansion valve for controlling the refrigerant flowing to the inverter module and a second electronic expansion valve for controlling the refrigerant flowing to the rectifier module, wherein the control unit is further used to: when the inter-tube pressure difference Ps is not less than the first pressure difference judgment value Py, turn off the refrigerant pump and open the bypass valve to control the refrigerant in the condenser to flow through the bypass pipeline where the bypass valve is located, cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator; when the inter-tube pressure difference Ps is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, open the refrigerant pump. The pump and the bypass valve are used to control the refrigerant in the condenser to flow through the bypass pipe where the bypass valve is located and the refrigerant pump at the same time, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py; when the inter-tube pressure difference Ps is less than the second pressure difference judgment value Px, the refrigerant pump is turned on and the bypass valve is closed to control the refrigerant in the condenser to flow through the refrigerant pump, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator.

[0023] Optionally, the control unit is further configured to: when the module temperature Tn is greater than the second temperature judgment value T2, reduce the opening of the corresponding electronic expansion valve by a1% per specified time interval Δs, wherein the module temperature Tn is the temperature of the inverter module or the rectifier module; when the module temperature Tn is between the first temperature judgment value T1 and the second temperature judgment value T2, reduce the opening of the corresponding electronic expansion valve by a2% per specified time interval Δs, wherein the first temperature judgment value T1 is less than the second temperature judgment value T2, and a2 is greater than 0 and less than a1; when the module temperature Tn is between the first temperature judgment value T1 and the module target temperature Ts, reduce the opening of the corresponding electronic expansion valve by a3% per specified time interval Δs, wherein the module target temperature Ts is less than the first temperature judgment value T1, and a3 is greater than 0 and less than a2; and when the module temperature Tn is not greater than the module target temperature Ts, maintain the opening of the corresponding electronic expansion valve unchanged.

[0024] Optionally, the control unit is also used to: when the compressor is turned off, open the opening of the third electronic expansion valve to the maximum, open the refrigerant pump and close the bypass valve, open the first electronic expansion valve and close the second electronic expansion valve, so as to control the refrigerant in the condenser to be drawn by the refrigerant pump and flow through the first electronic expansion valve to cool the inverter module, and then the refrigerant returns to the evaporator, wherein the third electronic expansion valve is an electronic expansion valve for the refrigerant to flow back to the evaporator midway.

[0025] According to another aspect of an embodiment of the present application, an air-conditioning device is further provided, comprising the cooling system of the above-mentioned air-conditioning inverter.

[0026] According to another aspect of an embodiment of the present application, a computer-readable storage medium is further provided, which includes a stored program, and the program implements the above method when executed by a processor.

[0027] According to another aspect of an embodiment of the present application, an electronic device is also provided, including: one or more processors; a storage device for storing one or more programs, which, when executed by the one or more processors, enables the one or more processors to implement the above-mentioned method.

[0028] According to one aspect of the present application, a computer program product or computer program is provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the steps of any of the above-described method embodiments.

[0029] By applying the technical solution of the present application, the bypass valve and the refrigerant pump are connected to the condenser, and the electronic expansion valve is connected to the bypass valve and the refrigerant pump respectively. Then, the bypass valve, the refrigerant pump and the electronic expansion valve can be combined and controlled according to the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator, so as to extract refrigerant from the condenser to cool the inverter module and the rectifier module. By adopting the method of the refrigerant pump, the bypass pipe and the electronic expansion valve, a more efficient integrated cooling solution is achieved without the need for a separate cooler. This can solve the technical problem of high cost of separately configuring a cooler for cooling the inverter in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of an optional cooling system of an air-conditioning inverter according to an embodiment of the present application;

[0031] Figure 2 is a flow chart of an optional cooling method for an air-conditioning inverter according to an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of an optional cooling solution for an air-conditioning inverter according to an embodiment of the present application;

[0033] Figure 4 is a schematic diagram of an optional cooling system of an air-conditioning inverter according to an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of an optional cooling system of an air-conditioning inverter according to an embodiment of the present application;

[0035] Figure 6 is a schematic diagram of an optional cooling system of an air-conditioning inverter according to an embodiment of the present application;

[0036] Figure 7 is a schematic diagram of an optional cooling device of an air-conditioning inverter according to an embodiment of the present application;

[0037] Figure 8 This is a structural block diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of this application more clear, this application will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0039] The terms used in the examples of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in the examples of this application and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0040] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0041] It should be understood that although the terms first, second, third, etc. may be used to describe certain technical features in the embodiments of the present application, these technical features should not be limited to these terms. These terms are only used to distinguish these technical features.

[0042] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0043] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0044] Example 1

[0045] According to one aspect of the embodiment of the present application, an embodiment of a cooling system for an air-conditioning inverter is provided, wherein a bypass valve and a refrigerant pump are connected to a condenser, and an electronic expansion valve is connected to the bypass valve and the refrigerant pump, respectively. The bypass valve, the refrigerant pump and the electronic expansion valve can then be controlled in combination according to the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator, so as to extract refrigerant from the condenser to cool the inverter module and the rectifier module. By using a refrigerant pump, a bypass pipe and an electronic expansion valve, a more efficient integrated cooling solution is achieved without the need for a separate cooling machine, which can solve the technical problem of high cost in the related art of separately configuring a cooling machine for cooling the inverter. Figure 1 As shown, the system includes:

[0046] A condenser 2 (such as a shell and tube condenser), a bypass valve 8 connected to the condenser, a refrigerant pump 9 connected to the condenser, an electronic expansion valve (such as a first electronic expansion valve 10 and a second electronic expansion valve 11) connected to the bypass valve and the refrigerant pump respectively, an inverter module 13 connected to the electronic expansion valve, and a rectifier module 14 connected to the electronic expansion valve. The bypass valve, the refrigerant pump, and the electronic expansion valve are used to extract refrigerant from the condenser through combined control to cool the inverter module and the rectifier module.

[0047] Optionally, the system may further include: a compressor 1 , a condensing pressure sensor 3 , an electronic expansion valve 4 , an evaporation pressure sensor 5 , a shell and tube evaporator 6 , a cooling pipeline 7 , and a frequency converter 12 .

[0048] The above-mentioned electronic expansion valve includes: a first electronic expansion valve connected to the bypass valve and the refrigerant pump respectively, and the first electronic expansion valve is used to control the refrigerant flowing to the inverter module; a second electronic expansion valve connected to the bypass valve and the refrigerant pump respectively, and the second electronic expansion valve is used to control the refrigerant flowing to the rectifier module.

[0049] Optionally, the above system may include multiple connected cooling pipes: a first cooling pipe, one end of the first cooling pipe is connected to the condenser; a second cooling pipe and a third cooling pipe, one end of the second cooling pipe and one end of the third cooling pipe are both connected to the other end of the first cooling pipe, the other end of the second cooling pipe is connected to the bypass valve, and the other end of the third cooling pipe is connected to the refrigerant pump; a fourth cooling pipe and a fifth cooling pipe, one end of the fourth cooling pipe is connected to the bypass valve, and one end of the fifth cooling pipe is connected to the refrigerant pump; a sixth cooling pipe, one end of the sixth cooling pipe is respectively connected to the other end of the fourth cooling pipe and the other end of the fifth cooling pipe; a seventh cooling pipe and an eighth cooling pipe, one end of the seventh cooling pipe and one end of the eighth cooling pipe are both connected to the other end of the sixth cooling pipe, the other end of the seventh cooling pipe is connected to the first electronic expansion valve, and the other end of the eighth cooling pipe is connected to the second electronic expansion valve; a ninth cooling pipe and a tenth cooling pipe, one end of the ninth cooling pipe is connected to the first electronic expansion valve, the other end of the ninth cooling pipe is connected to the inverter module, one end of the tenth cooling pipe is connected to the second electronic expansion valve, and the other end of the tenth cooling pipe is connected to the rectifier module.

[0050] Optionally, when the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator is not less than the first pressure difference judgment value Py, the refrigerant pump is in the closed state and the bypass valve is in the open state, the refrigerant in the condenser flows through the bypass line where the bypass valve is located, passes through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flows back to the evaporator.

[0051] Optionally, when the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, the refrigerant pump and the bypass valve are in the open state, and the refrigerant in the condenser flows through the bypass line where the bypass valve is located and the refrigerant pump at the same time, cools the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flows back to the evaporator. The second pressure difference judgment value Px is less than the first pressure difference judgment value Py.

[0052] Optionally, when the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator is less than the second pressure difference judgment value Px, the refrigerant pump is in the open state and the bypass valve is in the closed state, the refrigerant in the condenser flows through the refrigerant pump, passes through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flows back to the evaporator.

[0053] In the technical solution of the present application: 1) by using the refrigerant pump and the bypass pipe pressure difference control, a pressure difference cooling inverter can be established to meet the cooling demand inside the inverter when the photovoltaic centrifuge is running in various modes; 2) the refrigerant pump and the bypass pipe pressure difference are used to realize three cooling mode controls: the refrigerant pump provides power cooling, the bypass pipe pressure difference controls cooling, and the refrigerant pump and the bypass pipe pressure difference controls mixed cooling; 3) the refrigerant pump and the bypass pipe are used in combination with the electronic expansion valve and the solenoid valve to realize dynamic intelligent control and realize the integrated cooling demand more efficiently; 4) the condenser liquid extraction design is adopted to utilize Using the characteristics of the condenser pressure and temperature, combined with the opening of the electronic expansion valve, can effectively avoid condensation in the inverter and achieve a precise cooling effect; 5) Dynamically adjust and switch three cooling modes based on the system status: In photovoltaic centrifuge operation mode, when the system pressure difference is sufficient, the system pressure difference is used through the bypass pipe to achieve inverter cooling; in photovoltaic centrifuge operation or pure photovoltaic power generation mode, when the system pressure difference is insufficient or the centrifuge is not turned on, the refrigerant pump is used to drive the inverter cooling; in photovoltaic centrifuge operation mode, when the system pressure difference is slightly low, the refrigerant pump and bypass pipe pressure difference control cooling are achieved simultaneously.

[0054] The technical solution of the present application has the following beneficial effects: 1) The cooling system of the present application based on the refrigerant pump and the pressure difference control inverter can still control the cooling of the inverter module in various operating modes of the photovoltaic centrifuge without the need for an independent cooling machine; 2) The present system solves the problem that the photovoltaic air-conditioning inverter needs to be separately configured with a cooling machine and a fin-tube radiator for cooling. One system can complete the control of the module temperature and the temperature inside the cabinet of the photovoltaic water-cooled unit; 3) The cooling system of the present application adopts a refrigerant pump and a bypass pipe in parallel control mode to take liquid from the centrifuge system for cooling, thereby avoiding the cooling pipe being too long and affecting the cooling effect of the inverter module; 4) The cooling system of the present application adopts a design of taking liquid from the condenser and returning it to the evaporator, which can use the pressure difference generated by the system to cool the inverter when the photovoltaic unit is running, saving the power consumption of the refrigerant pump and its independent cooling system; 5) The cooling system of the present application adopts a refrigerant pump with an electronic expansion valve control instead of a cooling machine control to better meet the refrigerant quantity demand, with a simple and reliable structure, lower cost, and not easily affected by environmental factors.

[0055] Example 2

[0056] According to one aspect of the embodiments of the present application, an embodiment of a cooling method for an air conditioner inverter is provided, such as Figure 2 As shown, the method includes the following steps:

[0057] Step S1: obtaining the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator.

[0058] In step S2, the bypass valve, the refrigerant pump, and the electronic expansion valve are controlled in combination according to the inter-tube pressure difference Ps to extract refrigerant from the condenser to cool the inverter module and the rectifier module, wherein the bypass valve and the refrigerant pump are both connected to the condenser, and the electronic expansion valve is respectively connected to the bypass valve and the refrigerant pump.

[0059] Optionally, the electronic expansion valve includes a first electronic expansion valve for controlling the refrigerant flowing to the inverter module and a second electronic expansion valve for controlling the refrigerant flowing to the rectifier module, wherein the bypass valve, the refrigerant pump and the electronic expansion valve are controlled in combination according to the inter-tube pressure difference Ps to extract refrigerant from the condenser to cool the inverter module and the rectifier module, including: when the inter-tube pressure difference Ps is not less than the first pressure difference judgment value Py, the refrigerant pump is turned off and the bypass valve is opened to control the refrigerant in the condenser to flow through the bypass line where the bypass valve is located, cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator; ... When it is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, the refrigerant pump and the bypass valve are turned on to control the refrigerant in the condenser to flow through the bypass pipe where the bypass valve is located and the refrigerant pump at the same time, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py; when the inter-tube pressure difference Ps is less than the second pressure difference judgment value Px, the refrigerant pump is turned on and the bypass valve is closed to control the refrigerant in the condenser to flow through the refrigerant pump, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator.

[0060] Optionally, when the compressor is turned on, the bypass valve, the refrigerant pump and the electronic expansion valve are combinedly controlled according to the inter-pipe pressure difference Ps, including: when the module temperature Tn is greater than the second temperature judgment value T2, the opening of the corresponding electronic expansion valve is reduced by a1% per specified time interval Δs, wherein the module temperature Tn is the temperature of the inverter module or the rectifier module; when the module temperature Tn is between the first temperature judgment value T1 and the second temperature judgment value T2, the opening of the corresponding electronic expansion valve is reduced by a2% per specified time interval Δs, wherein the first temperature judgment value T1 is less than the second temperature judgment value T2, and a2 is greater than 0 and less than a1; when the module temperature Tn is between the first temperature judgment value T1 and the module target temperature Ts, the opening of the corresponding electronic expansion valve is reduced by a3% per specified time interval Δs, wherein the module target temperature Ts is less than the first temperature judgment value T1, and a3 is greater than 0 and less than a2; when the module temperature Tn is not greater than the module target temperature Ts, the opening of the corresponding electronic expansion valve is maintained unchanged.

[0061] Optionally, when the compressor is turned off, the bypass valve, refrigerant pump and electronic expansion valve are combined and controlled according to the inter-pipe pressure difference Ps, including: opening the third electronic expansion valve to the maximum, turning on the refrigerant pump and closing the bypass valve, turning on the first electronic expansion valve and closing the second electronic expansion valve to control the refrigerant in the condenser to be drawn by the refrigerant pump and flow through the first electronic expansion valve to cool the inverter module, and then the refrigerant returns to the evaporator, wherein the third electronic expansion valve is an electronic expansion valve for the refrigerant to flow back to the evaporator midway.

[0062] Through the above steps, the bypass valve and the refrigerant pump are connected to the condenser, and the electronic expansion valve is connected to the bypass valve and the refrigerant pump respectively. Then, the bypass valve, the refrigerant pump and the electronic expansion valve can be controlled in combination according to the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator to extract refrigerant from the condenser to cool the inverter module and the rectifier module. The refrigerant pump, the bypass pipe and the electronic expansion valve are used to achieve a more efficient integrated cooling solution without the need for a separate cooler. This can solve the technical problem of high cost in the related art of separately configuring a cooler for cooling the inverter.

[0063] Example 3

[0064] The technical solution of this application can solve the problem that the photovoltaic air conditioning unit cannot use its own refrigerant to cool the module inside the inverter in various operating modes of the photovoltaic air conditioning; solve the problem that the cooling machine and the photovoltaic air conditioning are independent and require two sets of control systems for operation and control; solve the problem of insufficient cooling caused by insufficient refrigerant due to the excessive length of the refrigerant pipe; solve the problem that the rectifier module cannot be cooled and the temperature rises due to the failure of the cooling machine in pure photovoltaic mode; solve the problem that the independent cooling machine cannot operate normally due to environmental, spatial and other factors. As an optional embodiment, the technical solution of this application is further described in detail below in combination with specific implementation methods:

[0065] This application provides a new photovoltaic air conditioning inverter cooling system, such as Figure 1 As shown, the photovoltaic air-conditioning inverter needs to be equipped with a separate cooling machine and a fin-tube radiator. Through the combined control of the refrigerant pump, cooling pipeline, electronic expansion valve, and shut-off valve, the unit's own pressure difference and the refrigerant pump are used to provide dynamic circulation kinetic energy, and liquid refrigerant is extracted from the bottom of the condenser. The throttling cooling of the electronic expansion valve is used to cool the rectifier and inverter modules, and finally the refrigerant returns to the evaporator. This cooling system uses a refrigerant pump with an electronic expansion valve control instead of a chiller control to better meet the refrigerant volume demand, and has a simple and reliable structure, lower cost, and is not easily affected by environmental factors.

[0066] like Figure 3As shown in the figure, when the inverter module temperature Tn>Ts is detected, the photovoltaic cooling system controls the refrigerant cooling of the inverter rectifier and inverter modules by controlling the start and stop of the refrigerant pump, the on and off of the bypass valve, and the opening of the electronic expansion valve. According to actual application requirements, the control system can have three control modes:

[0067] Mode 1: If Figure 4 As shown in the figure, when the PV compressor is started and Ps ≥ Py, the system controls the refrigerant pump 9 to shut down and the bypass valve 8 to open. The refrigerant in the condenser flows directly through the bypass line, throttled by the electronic expansion valves 10 and 11, and then cools the inverter module 13 and rectifier module 14 before returning to the evaporator. The electronic expansion valves 10 and 11 have a default initial opening and adjust their opening based on the inverter and rectifier module temperatures. When the module temperature Tn > T2, the electronic expansion valve opening decreases by a1% per Δs. When the module temperature T1 < Tn < T2, the electronic expansion valve opening decreases by a2% per Δs. When the module temperature Ts < Tn < T1, the electronic expansion valve opening decreases by a3% per Δs. When the inverter and rectifier module temperatures Tn ≤ Ts, the electronic expansion valve maintains its current opening.

[0068] Mode 2: If Figure 5 As shown, when the photovoltaic compressor is started, when Ps is in the range of Px<Ps<Py, the pressure difference between the evaporator and the condenser is not enough to provide the circulation power for the refrigerant to flow to the inverter. The system controls the bypass valve 8 to open and the refrigerant pump 9 to open at the same time. The refrigerant pump provides power to extract the refrigerant from the bottom of the condenser. The refrigerant in the condenser flows through the bypass pipe and the refrigerant pump at the same time, and cools the inverter after passing through the electronic expansion valves 10 and 11. The control mode of the electronic expansion valves 10 and 11 is consistent with mode 1, so that the temperature of the inverter module 13 and the rectifier module 14 drops to Ts, and finally the refrigerant returns to the evaporator.

[0069] Mode 3: If Figure 6 As shown, with the PV compressor started, when Ps ≤ Px, the pressure differential between the evaporator and condenser is too low. The system then closes bypass valve 8 and turns on refrigerant pump 9, which draws refrigerant from the bottom of the condenser. The refrigerant in the condenser flows through the refrigerant pump, through the inverter, and then through electronic expansion valves 10 and 11, cooling the inverter before returning to the evaporator. The control mode of electronic expansion valves 10 and 11 is consistent with Mode 1, reducing the temperature of inverter module 13 and rectifier module 14 to Ts.

[0070] When the photovoltaic compressor is off, it is pure photovoltaic power generation. The system controls the electronic expansion valve 4 to open to the maximum to balance the refrigerant liquid level between the evaporator and the condenser. At this time, the rectifier module 14 is not working, and the electronic expansion valve 11 is controlled to close. The system controls the refrigerant pump 9 to open and the bypass valve 8 to close. The refrigerant in the condenser is extracted by the refrigerant pump and flows through the electronic expansion valve 10 to cool the inverter module in the inverter. The control mode of the electronic expansion valve 10 is consistent with mode 1, so that the temperature of the inverter module 13 drops to Ts, and finally the refrigerant returns to the evaporator.

[0071] When it is detected that the inverter 12 is not working, the system controls the refrigerant pump 9 and the bypass valve 8 to close, and adjusts the electronic expansion valves 10 and 11 to the default opening.

[0072] The meanings of the parameters involved in the above embodiment are shown in Table 1:

[0073] Table 1

[0074] code name meaning Indicative value Tn Measured temperature of the inverter module Ts Module target temperature 45℃ T1 Temperature judgment value 1 50℃ T2 Temperature judgment value 2 70℃ a1％ Electronic expansion valve to adjust fabric width 1 10％ a2％ Electronic expansion valve to adjust the cloth width 2 5％ a4％ Electronic expansion valve adjusts the cloth width 3 2％ Ps Pressure difference between condenser shell and tube and evaporator shell and tube Px Pressure difference judgment value 1 300kPa Py Pressure difference judgment value 2 600kPa

[0075] In the technical solution of the present application, a fan can also be arranged inside the inverter chassis. The airflow blown out by the internal fan reaches each area through the airflow guide channel, passes through the heat exchanger, and then enters the interior of the chassis to form a gas circulation loop, absorbs the heat emitted by each component, and realizes heat dissipation. The disadvantage of this solution is that the cooling effect is poor. When the cooling fan stops working, dust is easily entered, and the heat dissipation is relatively poor when the components generate a lot of heat.

[0076] Alternatively, a cooling water pump can be used to circulate cooling water through a circulation pipe. The cooling water pump then drives the cooling water through the inverter cooling branch. The cooling water flows through the inverter, thereby cooling the inverter. The inverter is provided with a temperature sensor, and a self-operated temperature control valve is provided in the inverter cooling branch. The temperature sensor transmits the inverter temperature to the self-operated temperature control valve via a signal transmission mechanism. The self-operated temperature control valve adjusts the valve opening by comparing the difference between the inverter temperature signal and the set temperature, thereby controlling the cooling water flow through the inverter cooling branch to maintain a constant inverter temperature.

[0077] Use cooling water to cool the inverter and dissipate heat, so that the temperature of the inverter radiator is relatively constant, preventing the device from being damaged by overheating and the adverse effects of condensation on the radiator on the inverter, thereby improving the stability of the inverter operation.

[0078] This application designs a highly efficient and reliable photovoltaic cooling system. By controlling the refrigerant pump, cooling piping, electronic expansion valve, and bypass valve, this system can establish a pressure differential to cool the inverter and meet the inverter's internal cooling requirements while operating in various photovoltaic cooling modes. This cooling system boasts efficient control and a reliable structural design. By utilizing the refrigerant's circulating cooling effect, the system ensures the cooling efficiency and operational reliability of the photovoltaic air conditioner.

[0079] It should be noted that for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0080] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus the necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0081] Example 4

[0082] According to another aspect of the embodiments of the present application, there is also provided an embodiment of a cooling device for an air conditioner inverter for implementing the cooling method of the air conditioner inverter. Figure 7 As shown, the device may include:

[0083] An acquisition unit 71 is used to obtain the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator; a control unit 73 is used to perform combined control of the bypass valve, the refrigerant pump and the electronic expansion valve according to the inter-tube pressure difference Ps, so as to extract refrigerant from the condenser to cool the inverter module and the rectifier module, wherein the bypass valve and the refrigerant pump are connected to the condenser, and the electronic expansion valve is respectively connected to the bypass valve and the refrigerant pump.

[0084] Optionally, the electronic expansion valve includes a first electronic expansion valve for controlling the refrigerant flowing to the inverter module and a second electronic expansion valve for controlling the refrigerant flowing to the rectifier module, wherein the control unit is further used to: when the inter-tube pressure difference Ps is not less than the first pressure difference judgment value Py, turn off the refrigerant pump and open the bypass valve to control the refrigerant in the condenser to flow through the bypass pipeline where the bypass valve is located, cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator; when the inter-tube pressure difference Ps is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, open the refrigerant pump. The pump and the bypass valve are used to control the refrigerant in the condenser to flow through the bypass pipe where the bypass valve is located and the refrigerant pump at the same time, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py; when the inter-tube pressure difference Ps is less than the second pressure difference judgment value Px, the refrigerant pump is turned on and the bypass valve is closed to control the refrigerant in the condenser to flow through the refrigerant pump, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator.

[0085] Optionally, the control unit is further configured to: when the module temperature Tn is greater than the second temperature judgment value T2, reduce the opening of the corresponding electronic expansion valve by a1% per specified time interval Δs, wherein the module temperature Tn is the temperature of the inverter module or the rectifier module; when the module temperature Tn is between the first temperature judgment value T1 and the second temperature judgment value T2, reduce the opening of the corresponding electronic expansion valve by a2% per specified time interval Δs, wherein the first temperature judgment value T1 is less than the second temperature judgment value T2, and a2 is greater than 0 and less than a1; when the module temperature Tn is between the first temperature judgment value T1 and the module target temperature Ts, reduce the opening of the corresponding electronic expansion valve by a3% per specified time interval Δs, wherein the module target temperature Ts is less than the first temperature judgment value T1, and a3 is greater than 0 and less than a2; and when the module temperature Tn is not greater than the module target temperature Ts, maintain the opening of the corresponding electronic expansion valve unchanged.

[0086] Optionally, the control unit is also used to: when the compressor is turned off, open the opening of the third electronic expansion valve to the maximum, open the refrigerant pump and close the bypass valve, open the first electronic expansion valve and close the second electronic expansion valve, so as to control the refrigerant in the condenser to be drawn by the refrigerant pump and flow through the first electronic expansion valve to cool the inverter module, and then the refrigerant returns to the evaporator, wherein the third electronic expansion valve is an electronic expansion valve for the refrigerant to flow back to the evaporator midway.

[0087] Through the above-mentioned module, the bypass valve and the refrigerant pump are connected to the condenser, and the electronic expansion valve is connected to the bypass valve and the refrigerant pump respectively. Then, the bypass valve, the refrigerant pump and the electronic expansion valve can be controlled in combination according to the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator, so as to extract refrigerant from the condenser to cool the inverter module and the rectifier module. The refrigerant pump, the bypass pipe and the electronic expansion valve are used to achieve a more efficient integrated cooling solution without the need for a separate cooler. This can solve the technical problem of high cost in the related art of separately configuring a cooler for cooling the inverter.

[0088] It should be noted that the examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments. It should be noted that the above modules, as part of the device, can run in a corresponding hardware environment and can be implemented by software or hardware, wherein the hardware environment includes a network environment.

[0089] Example 5

[0090] This embodiment provides an air-conditioning device, including the cooling system of the above-mentioned air-conditioning inverter. The specific operation mode thereof refers to the above-mentioned embodiment.

[0091] Example 6

[0092] This embodiment provides an electronic device (such as a refrigerator, an air purifier, or other household appliances), the electronic device comprising: a processor 201, a memory 202, and a transmission device 203, such as Figure 8 As shown, the terminal may further include input and output devices 204; wherein:

[0093] The memory 202 can be used to store software programs and modules, such as program instructions / modules corresponding to the methods and devices in the embodiments of the present application. The processor 201 executes various functional applications and data processing by running the software programs and modules stored in the memory 202, that is, implementing the above-mentioned method. The memory 202 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 202 may further include a memory remotely located relative to the processor 201, and these remote memories may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0094] The transmission device 203 is used to receive or send data via a network, and can also be used for data transmission between a processor and a memory. Specific examples of the network may include wired networks and wireless networks. In one embodiment, the transmission device 203 includes a network interface controller (NIC), which can be connected to other network devices and a router via a network cable to communicate with the Internet or a local area network. In one embodiment, the transmission device 203 is a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0095] Specifically, the memory 202 is used to store application programs.

[0096] The processor 201 may call the application program stored in the memory 202 through the transmission device 203 to execute the steps in the above embodiment.

[0097] Example 7

[0098] The embodiments of the present application provide a software for executing the technical solutions described in the above embodiments and preferred implementation modes.

[0099] An embodiment of the present application provides a non-volatile computer storage medium, which stores computer-executable instructions. The computer-executable instructions can execute the method for editing content in a document in any of the above method embodiments.

[0100] The above-mentioned software is stored in the above-mentioned storage medium, which includes but is not limited to: a CD, a floppy disk, a hard disk, a rewritable memory, etc.

[0101] The above-mentioned product can execute the method provided in the embodiment of this application, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the method provided in the embodiment of this application.

[0102] The electronic devices of the embodiments of the present application exist in various forms, including but not limited to:

[0103] (1) Mobile communication devices: These devices are characterized by their mobile communication capabilities and are primarily designed to provide voice and data communications. These terminals include smartphones (e.g., iPhones), multimedia phones, feature phones, and low-end phones.

[0104] (2) Ultra-mobile personal computer devices: These devices fall under the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access. These terminals include PDAs, MIDs, and UMPCs, such as the iPad.

[0105] (3) Portable entertainment devices: These devices can display and play multimedia content. These devices include audio and video players (such as iPods), handheld game consoles, e-books, smart toys, and portable car navigation devices.

[0106] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to a general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0107] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0108] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0109] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cooling system for an air conditioner inverter, characterized in that: The cooling system comprises: A condenser, a bypass valve connected to the condenser, a refrigerant pump connected to the condenser, an electronic expansion valve connected to the bypass valve and the refrigerant pump respectively, an inverter module connected to the electronic expansion valve, and a rectifier module connected to the electronic expansion valve; The bypass valve, the refrigerant pump, and the electronic expansion valve are used to extract refrigerant from the condenser to cool the inverter module and the rectifier module through combined control; When the inter-tube pressure difference Ps between the shell tube of the condenser and the shell tube of the evaporator is not less than the first pressure difference judgment value Py, the refrigerant pump is in the off state and the bypass valve is in the open state, and the refrigerant in the condenser flows through the bypass line where the bypass valve is located, passes through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flows back to the evaporator; When the inter-tube pressure difference Ps between the shell tube of the condenser and the shell tube of the evaporator is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, the refrigerant pump and the bypass valve are in an open state, and the refrigerant in the condenser flows through the bypass line where the bypass valve is located and the refrigerant pump at the same time, passes through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flows back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py; When the inter-tube pressure difference Ps between the shell tube of the condenser and the shell tube of the evaporator is less than or equal to the second pressure difference judgment value Px, the refrigerant pump is in the open state and the bypass valve is in the closed state, and the refrigerant in the condenser flows through the refrigerant pump, passes through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flows back to the evaporator.

2. The cooling system according to claim 1, characterized in that The electronic expansion valve comprises: a first electronic expansion valve connected to the bypass valve and the refrigerant pump, respectively, the first electronic expansion valve being used to control the refrigerant flowing to the inverter module; A second electronic expansion valve is connected to the bypass valve and the refrigerant pump respectively, and the second electronic expansion valve is used to control the refrigerant flowing to the rectifier module.

3. The cooling system according to claim 2, characterized in that The cooling system further comprises: a first cooling pipe, one end of which is in communication with the condenser; a second cooling pipe and a third cooling pipe, wherein one end of the second cooling pipe and one end of the third cooling pipe are both connected to the other end of the first cooling pipe, the other end of the second cooling pipe is connected to the bypass valve, and the other end of the third cooling pipe is connected to the refrigerant pump; a fourth cooling pipe and a fifth cooling pipe, wherein one end of the fourth cooling pipe is connected to the bypass valve, and one end of the fifth cooling pipe is connected to the refrigerant pump; a sixth cooling pipe, one end of the sixth cooling pipe being connected to the other end of the fourth cooling pipe and the other end of the fifth cooling pipe respectively; a seventh cooling pipe and an eighth cooling pipe, one end of each of the seventh cooling pipe and one end of the eighth cooling pipe being connected to the other end of the sixth cooling pipe, the other end of the seventh cooling pipe being connected to the first electronic expansion valve, and the other end of the eighth cooling pipe being connected to the second electronic expansion valve; A ninth cooling tube and a tenth cooling tube, one end of the ninth cooling tube is connected to the first electronic expansion valve, and the other end of the ninth cooling tube is connected to the inverter module, one end of the tenth cooling tube is connected to the second electronic expansion valve, and the other end of the tenth cooling tube is connected to the rectifier module.

4. An air conditioning device, characterized in that: A cooling system comprising the air-conditioning inverter according to any one of claims 1 to 3.

5. A cooling method for an air conditioner inverter, characterized in that: The cooling method comprises: Obtain the inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator; The bypass valve, the refrigerant pump, and the electronic expansion valve are controlled in combination according to the inter-tube pressure difference Ps to extract refrigerant from the condenser to cool the inverter module and the rectifier module, wherein the bypass valve and the refrigerant pump are both connected to the condenser, and the electronic expansion valve is respectively connected to the bypass valve and the refrigerant pump; The electronic expansion valve includes a first electronic expansion valve for controlling the flow of refrigerant to the inverter module and a second electronic expansion valve for controlling the flow of refrigerant to the rectifier module, wherein the bypass valve, the refrigerant pump, and the electronic expansion valve are controlled in combination according to the inter-tube pressure difference Ps to extract refrigerant from the condenser to cool the inverter module and the rectifier module, including: When the inter-tube pressure difference Ps is not less than the first pressure difference judgment value Py, the refrigerant pump is turned off and the bypass valve is opened to control the refrigerant in the condenser to flow through the bypass pipeline where the bypass valve is located, pass through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flow back to the evaporator; When the inter-tube pressure difference Ps is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, the refrigerant pump and the bypass valve are turned on to control the refrigerant in the condenser to simultaneously flow through the bypass line where the bypass valve is located and the refrigerant pump, pass through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flow back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py; When the inter-tube pressure difference Ps is less than the second pressure difference judgment value Px, the refrigerant pump is turned on and the bypass valve is closed to control the refrigerant in the condenser to flow through the refrigerant pump, pass through the first electronic expansion valve and the second electronic expansion valve to cool the inverter module and the rectifier module, and then flow back to the evaporator.

6. The cooling method according to claim 5, characterized in that: When the compressor is turned on, the bypass valve, the refrigerant pump and the electronic expansion valve are controlled in combination according to the inter-pipe pressure difference Ps, including: When the module temperature Tn is greater than the second temperature judgment value T2, the opening of the corresponding electronic expansion valve is reduced by a1% every specified time interval Δs, wherein the module temperature Tn is the temperature of the inverter module or the rectifier module, and a1 is greater than 0; When the module temperature Tn is between the first temperature judgment value T1 and the second temperature judgment value T2, the opening of the corresponding electronic expansion valve is reduced by a2% every specified time interval Δs, wherein the first temperature judgment value T1 is less than the second temperature judgment value T2, and a2 is greater than 0 and less than a1; When the module temperature Tn is between the first temperature judgment value T1 and the module target temperature Ts, the opening degree of the corresponding electronic expansion valve is reduced by a3% every specified time interval Δs, wherein the module target temperature Ts is lower than the first temperature judgment value T1, and a3 is greater than 0 and less than a2; When the module temperature Tn is not greater than the module target temperature Ts, the opening of the corresponding electronic expansion valve is maintained unchanged.

7. The cooling method according to claim 5, characterized in that: When the compressor is turned off, the bypass valve, the refrigerant pump and the electronic expansion valve are controlled in combination according to the inter-pipe pressure difference Ps, including: Open the third electronic expansion valve to the maximum, turn on the refrigerant pump and close the bypass valve, turn on the first electronic expansion valve and close the second electronic expansion valve to control the refrigerant in the condenser to be drawn by the refrigerant pump and flow through the first electronic expansion valve to cool the inverter module, and then the refrigerant returns to the evaporator, wherein the third electronic expansion valve is an electronic expansion valve for the refrigerant to flow back to the evaporator midway.

8. A cooling device for an air conditioner inverter, characterized in that: The cooling device comprises: An acquisition unit, used to acquire an inter-tube pressure difference Ps between the shell and tube of the condenser and the shell and tube of the evaporator; a control unit, configured to control a bypass valve, a refrigerant pump, and an electronic expansion valve in combination according to the inter-tube pressure difference Ps, so as to extract refrigerant from the condenser to cool the inverter module and the rectifier module, wherein the bypass valve and the refrigerant pump are connected to the condenser, and the electronic expansion valve is connected to the bypass valve and the refrigerant pump, respectively; The electronic expansion valve includes a first electronic expansion valve for controlling the refrigerant flowing to the inverter module and a second electronic expansion valve for controlling the refrigerant flowing to the rectifier module, wherein the control unit is further used to: when the inter-tube pressure difference Ps is not less than the first pressure difference judgment value Py, close the refrigerant pump and open the bypass valve to control the refrigerant in the condenser to flow through the bypass pipeline where the bypass valve is located, cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator; when the inter-tube pressure difference Ps is between the first pressure difference judgment value Py and the second pressure difference judgment value Px, open the refrigerant pump and The bypass valve is used to control the refrigerant in the condenser to flow through the bypass pipe where the bypass valve is located and the refrigerant pump at the same time, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator, wherein the second pressure difference judgment value Px is less than the first pressure difference judgment value Py; when the inter-tube pressure difference Ps is less than the second pressure difference judgment value Px, the refrigerant pump is turned on and the bypass valve is closed to control the refrigerant in the condenser to flow through the refrigerant pump, and cool the inverter module and the rectifier module after passing through the first electronic expansion valve and the second electronic expansion valve, and then flow back to the evaporator.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 5 to 7 is implemented.

10. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, causes the one or more processors to implement the method according to any one of claims 5 to 7.

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