Air conditioning system and control method therefor

Abstract

The present invention relates to the field of air conditioners, and particularly provides an air conditioning system and a control method therefor, aiming at solving the problem of an existing air conditioning system being unable to perform effective heat dissipation on heat dissipation components while guaranteeing the stable operation of units. For this purpose, the air conditioning system in the present invention comprises: a compressor, a first heat exchanger, a first throttle valve, a refrigerant-based heat dissipator, a second throttle valve, and a second heat exchanger which form a loop and are communicated in sequence; and a first on-off valve, the first on-off valve being connected in parallel to the first throttle valve. The refrigerant-based heat dissipator is configured to perform heat dissipation on a heat dissipation component. By means of the configurations, effective heat dissipation can be performed on heat dissipation components while guaranteeing the stable operation of units.

Description

Air conditioning systems and their control methods This application claims priority to Chinese patent application No. CN202410674478.6, filed on May 28, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0001] This invention relates to the field of air conditioning, and specifically provides an air conditioning system and its control method. Background Technology

[0002] Most existing variable frequency units use refrigerant radiators to dissipate heat from components such as drive board chips. The refrigerant in the refrigerant radiator is a high-pressure, medium-high temperature liquid refrigerant condensed from the high-pressure side heat exchanger. When the air conditioning unit has excessively high condensing pressure and high capacity requirements, the temperature difference between the refrigerant and the drive board chip is usually insufficient. This results in poor heat dissipation of the drive board, and the unit frequency is limited and cannot continue to increase, thus restricting the capacity of the air conditioning unit.

[0003] For example, when using high-temperature refrigerants such as R290 to produce high-temperature water, the refrigerant temperature remains above 70°C after condensation, resulting in a small temperature difference between the refrigerant heat sink and the chip's extreme operating temperature, leading to poor heat dissipation. To alleviate this problem, air cooling can be used. However, when using an air conditioning unit fan for air cooling, the fan speed and airflow are low during high-temperature hot water production, resulting in insufficient heat exchange and failing to meet the chip's heat dissipation requirements.

[0004] Accordingly, there is a need in the field for a new air conditioning system and its control method to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, namely, the problem that existing air conditioning systems cannot effectively dissipate heat from heat dissipation components while ensuring stable operation of the unit.

[0006] In a first aspect, the present invention provides an air conditioning system, characterized in that the air conditioning system comprises: a compressor, a first heat exchanger, a first throttle valve, a refrigerant radiator, a second throttle valve, and a second heat exchanger connected in sequence in a circuit; a first on / off valve, wherein the first on / off valve is connected in parallel with the first throttle valve; and the refrigerant radiator is used to dissipate heat for heat dissipation components.

[0007] With the above technical solution, after the compressor starts, the refrigerant flows through the compressor, the first heat exchanger, the parallel structure of the first throttling valve and the first on-off valve, the refrigerant radiator, the second throttling valve and the second heat exchanger, and then back to the compressor. The temperature of the heat dissipation components can be kept within a reasonable range by controlling the opening and closing of the first on-off valve and adjusting the openings of the first and second throttling valves. For example, when heat dissipation is needed for the heat dissipation components, the first on-off valve is closed, allowing all the refrigerant to enter the first throttling valve before entering the refrigerant radiator, thus lowering the refrigerant temperature and increasing the temperature difference with the heat dissipation components for effective heat dissipation. In this case, to avoid excessive throttling and a rapid drop in low pressure, the opening of the second throttling valve can be increased, and then the opening of the first throttling valve can be adjusted to maintain the temperature of the heat dissipation components within a reasonable range. When heat dissipation is not needed for the heat dissipation components, the first on-off valve can be opened, and the first throttling valve can be fully opened to eliminate the throttling effect. Then, the opening of the second throttling valve is correspondingly reduced to maintain its original throttling function, thereby ensuring stable operation of the unit. Therefore, the above configuration can effectively dissipate heat from the heat dissipation components while ensuring stable operation of the unit.

[0008] Furthermore, even when using high-temperature refrigerants (such as R290) in the air conditioning system, it can effectively dissipate heat from the driver board chip, with the temperature of the refrigerant after condensation reaching at least below 70°C. Moreover, there is no need for air cooling of the refrigerant radiator; since air cooling is not required, there is no risk of leakage, fire, or explosion due to the inability to completely seal the electrical control box.

[0009] In the optional technical solution of the above-mentioned air conditioning system, the air conditioning system further includes: a second on-off valve, which is connected in parallel with the second throttle valve; and / or a four-way reversing valve, wherein the compressor is connected to the first heat exchanger and the second heat exchanger through the four-way reversing valve, the exhaust port of the compressor is connected to the inlet of the four-way reversing valve, the first port of the four-way reversing valve is connected to the gas port of the first heat exchanger, the suction port of the compressor is connected to the outlet of the four-way reversing valve, and the second port of the four-way reversing valve is connected to the gas port of the second heat exchanger.

[0010] By adopting the above technical solution, it is possible to avoid overheating of the driver board chip regardless of whether the air conditioning system is in cooling or heating mode, thus solving the problem of limited compressor frequency and insufficient capacity due to insufficient heat dissipation of the driver board chip. While ensuring heat dissipation of the refrigerant radiator, it also ensures stable operation of the air conditioning system and maintains optimal system conditions.

[0011] In the optional technical solutions of the above-mentioned air conditioning system, the compressor includes a gas inlet; the air conditioning system also includes an economizer and a throttling element. The economizer includes a first passage structure and a second passage structure that can exchange heat with each other. The first passage structure is connected to the refrigerant radiator and the second throttling valve at its two ends respectively. One end of the second passage structure is connected to the gas inlet, and the other end of the second passage is connected to one end of the first passage structure through a branch pipe. The throttling element is disposed on the branch pipe.

[0012] When the above technical solution is adopted, in the cooling mode, the refrigerant will exchange heat with the driver board chip after passing through the refrigerant heat sink, and the temperature will be increased. After the refrigerant reaches the economizer, it will exchange heat with the low-temperature refrigerant in the second channel structure in the first channel structure, so that the refrigerant temperature is maintained within a reasonable range and the cooling efficiency of the system is guaranteed.

[0013] In the optional technical solutions of the above-mentioned air conditioning system, the air conditioning system further includes a first temperature sensor, which is used to detect the component temperature of the heat dissipation component.

[0014] By adopting the above technical solution, the temperature of the heat dissipation component can be automatically detected, which facilitates automated control.

[0015] In the optional technical solutions of the above-mentioned air conditioning system, the air conditioning system further includes a second temperature sensor, a third temperature sensor, and an ambient temperature sensor; the second temperature sensor is located between the first throttle valve and the refrigerant radiator, and is used to detect the first temperature of the refrigerant flowing out through the first throttle valve; the third temperature sensor is located between the refrigerant radiator and the first passage structure, and is used to detect the second temperature of the refrigerant flowing out through the first passage structure; the ambient temperature sensor is used to detect the ambient temperature.

[0016] With the above technical solution, it is easy to automatically detect the refrigerant temperature at the inlet of the refrigerant radiator in both cooling and heating modes. Combined with the ambient temperature, it is possible to accurately determine whether condensation will occur on the surface of the refrigerant radiator, thereby preventing the formation of condensation on the refrigerant radiator.

[0017] In another aspect, the present invention also provides a control method for an air conditioning system, the air conditioning system comprising: a compressor, a first heat exchanger, a first throttle valve, a refrigerant radiator, a second throttle valve, and a second heat exchanger, which are sequentially connected and form a circuit; a first on / off valve, which is connected in parallel with the first throttle valve; the refrigerant radiator is used to dissipate heat for heat dissipation components; a first temperature sensor, which is used to detect the component temperature of the heat dissipation components; the control method comprising: acquiring the component temperature; controlling the opening and closing of the first on / off valve based on the component temperature, and adjusting the opening degree of the first throttle valve and the second throttle valve.

[0018] By adopting the above technical solution, the temperature of the heat dissipation component can be kept within a reasonable range and the stability of the system can be maintained by controlling the opening and closing of the first on / off valve and adjusting the opening degree of the first throttle valve and the second throttle valve.

[0019] In the optional technical solution of the control method of the above-mentioned air conditioning system, the step of "controlling the opening and closing of the first on-off valve based on the component temperature, and adjusting the opening degree of the first throttle valve and the second throttle valve" further includes: when the component temperature is greater than a first preset temperature, executing a first heat dissipation program; the first heat dissipation program is: controlling the first on-off valve to close; controlling the opening degree of the second throttle valve to increase the first preset opening degree; and adjusting the opening degree of the first throttle valve based on the component temperature so that the component temperature is within a preset temperature range.

[0020] When the above technical solution is adopted, if the component temperature is higher than the first preset temperature, it indicates that heat dissipation is needed for the heat dissipation component. In this case, the first on / off valve is closed, allowing all the refrigerant to enter the first throttling valve before entering the refrigerant radiator. This reduces the refrigerant temperature, increasing the temperature difference with the heat dissipation component and effectively cooling it. To prevent excessive throttling and a rapid drop in low pressure, the opening of the second throttling valve is increased. Then, the opening of the first throttling valve is adjusted based on the component temperature to maintain the heat dissipation component temperature within a reasonable range. Therefore, the above control method can effectively dissipate heat from the heat dissipation component while ensuring stable unit operation.

[0021] In the optional technical solution of the control method of the above-mentioned air conditioning system, the step of "adjusting the opening of the first throttle valve based on the component temperature to make the component temperature within a preset temperature range" further includes: when the component temperature is greater than a second preset temperature, controlling the opening of the first throttle valve to decrease at a preset first rate; when the component temperature is less than or equal to the second preset temperature and greater than or equal to a third preset temperature, controlling the opening of the first throttle valve to remain unchanged; when the component temperature is less than the third preset temperature, controlling the opening of the first throttle valve to increase at the first rate; wherein, the first preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the third preset temperature.

[0022] By adopting the above technical solution, the component temperature can be kept within a preset temperature range, thus maintaining the component temperature within a reasonable temperature range.

[0023] In an optional technical solution of the control method for the above-mentioned air conditioning system, the air conditioning system further includes a second temperature sensor and an ambient temperature sensor. The second temperature sensor is used to detect the first temperature of the refrigerant flowing out through the first throttle valve, and the ambient temperature sensor is used to detect the ambient temperature. The control method further includes: acquiring the first temperature and the ambient temperature; if the first temperature is greater than the sum of the ambient temperature and a preset positive adjustment value when the ambient temperature is less than a preset ambient temperature threshold, then controlling the opening of the first throttle valve to decrease at a preset first rate; and / or if the first temperature is greater than the ambient temperature when the ambient temperature is greater than a preset ambient temperature threshold, then controlling the opening of the first throttle valve to decrease at a preset first rate.

[0024] When using the above technical solution, condensation occurs because the temperature of the refrigerant on the radiator surface is lower than the ambient temperature. Condensation is more likely to form at low ambient temperatures. Adding a positive adjustment value to the ambient temperature is to set a safety margin to ensure that condensation does not occur on the refrigerant radiator surface. At high ambient temperatures, the risk of condensation on the refrigerant radiator surface is lower than at low temperatures; therefore, no adjustment value is added in this case.

[0025] In an optional technical solution of the control method for the above-mentioned air conditioning system, the control method further includes: exiting the first heat dissipation program when the component temperature is lower than the fourth preset temperature; wherein the third preset temperature is higher than the fourth preset temperature.

[0026] When the component temperature is lower than the fourth preset temperature, the temperature of the refrigerant radiator is already very low, and there is no need for all the refrigerant to enter the first throttling valve for throttling, so the first heat dissipation program is exited.

[0027] In the optional technical solution of the control method of the above-mentioned air conditioning system, the control method further includes: after exiting the first heat dissipation program, controlling the first on-off valve to open, controlling the opening degree of the first throttle valve to fully open, and controlling the opening degree of the second throttle valve to reduce the first preset opening degree.

[0028] After exiting the first heat dissipation program, the first on / off valve is opened, and the opening of the first throttle valve is fully opened to remove the throttling effect before the refrigerant radiator. No further special heat dissipation control is performed. The opening of the second throttle valve is reduced to the first preset opening so that the second throttle valve can quickly reach the optimal opening.

[0029] In the optional technical solution of the control method for the above-mentioned air conditioning system, after the step of "controlling the opening of the second throttle valve to increase the first preset opening" and / or after the step of "controlling the opening of the second throttle valve to decrease the first preset opening", the control method further includes: acquiring real-time operating parameter values; adjusting the opening of the second throttle valve based on the real-time operating parameter values ​​and preset target operating parameter values; the magnitude of the real-time operating parameter values ​​can change with the change of the throttle valve opening.

[0030] By adopting the above technical solutions, it is possible to ensure the heat dissipation of the refrigerant radiator while ensuring the stable operation of the unit and maintaining the optimal system state.

[0031] In the optional technical solution of the control method for the above-mentioned air conditioning system, the air conditioning system further includes: a second on-off valve, which is connected in parallel with the second throttle valve; a four-way reversing valve, wherein the compressor is connected to the first heat exchanger and the second heat exchanger through the four-way reversing valve, the exhaust port of the compressor is connected to the inlet of the four-way reversing valve, the first interface of the four-way reversing valve is connected to the gas port of the first heat exchanger, the suction port of the compressor is connected to the outlet of the four-way reversing valve, and the second interface of the four-way reversing valve is connected to the gas port of the second heat exchanger; the control method further includes: executing the first heat dissipation procedure only when the inlet is connected to the first interface and the second interface is connected to the outlet.

[0032] By adopting the above technical solution, the air conditioning system can effectively dissipate heat from the heat dissipation components while ensuring stable operation of the unit when executing the cooling mode.

[0033] In the optional technical solution of the control method of the above-mentioned air conditioning system, before the step of "controlling the opening of the second throttle valve to increase the first preset opening", the control method further includes: controlling the second on-off valve to close.

[0034] By adopting the above technical solutions, precise control of system operating parameters can be achieved, ensuring the operational stability of the air conditioning system.

[0035] In an optional technical solution of the control method for the above-mentioned air conditioning system, the control method further includes: when the inlet is connected to the second interface and the first interface is connected to the outlet, if the component temperature is greater than the first preset temperature, a second heat dissipation procedure is executed; the second heat dissipation procedure is: controlling the first on-off valve and the second on-off valve to close; controlling the opening of the first throttle valve to increase the opening by a first preset degree; and adjusting the opening of the second throttle valve based on the component temperature so that the component temperature is within a preset temperature range.

[0036] When the above technical solution is adopted, the air conditioning system operates in heating mode. The refrigerant flow direction is: compressor, second heat exchanger, second throttle valve, economizer, refrigerant radiator, first throttle valve and first heat exchanger, and then returns to the compressor. When the component temperature is higher than the first preset temperature, it indicates that heat dissipation is needed for the heat dissipation components. The second on / off valve is then closed, allowing all the refrigerant to enter the second throttle valve for throttling before entering the refrigerant radiator. This lowers the refrigerant temperature, increasing the temperature difference with the heat dissipation components and effectively cooling them. In this case, to prevent excessive throttling and a rapid drop in low pressure, the opening of the first throttle valve is increased. Then, the opening of the second throttle valve is adjusted based on the component temperature to maintain the temperature of the heat dissipation components within a reasonable range. Therefore, the above control method can effectively dissipate heat from the heat dissipation components while ensuring stable unit operation.

[0037] In the optional technical solution of the control method of the above-mentioned air conditioning system, the step of "adjusting the opening of the second throttle valve based on the component temperature to make the component temperature within a preset temperature range" further includes: when the component temperature is greater than a second preset temperature, controlling the opening of the second throttle valve to decrease at a preset first rate; when the component temperature is less than or equal to the second preset temperature and greater than or equal to a third preset temperature, controlling the opening of the second throttle valve to remain unchanged; when the component temperature is less than the third preset temperature, controlling the opening of the second throttle valve to increase at the first rate; wherein, the first preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the third preset temperature.

[0038] By adopting the above technical solution, the component temperature can be kept within a preset temperature range, thus maintaining the component temperature within a reasonable temperature range.

[0039] In the optional technical solution of the control method of the above-mentioned air conditioning system, the compressor includes a gas inlet; the air conditioning system also includes an economizer and a throttling element, the economizer includes a first passage structure and a second passage structure capable of exchanging heat with each other, the first passage structure is connected to the refrigerant radiator and the second throttling valve at its two ends respectively, one end of the second passage structure is connected to the gas inlet, and the other end of the second passage is connected to one end of the first passage structure through a branch pipe, the throttling element is disposed on the branch pipe; the air conditioning system also includes a third temperature sensor and an ambient temperature sensor, the third temperature sensor is used to detect the second temperature of the refrigerant flowing out through the first passage structure, and the ambient temperature sensor is used to detect the ambient temperature; the control method further includes: acquiring the second temperature and the ambient temperature; if the second temperature is greater than the sum of the ambient temperature and a preset positive adjustment value when the ambient temperature is less than a preset ambient temperature threshold, then controlling the opening of the second throttling valve to decrease at a preset first rate; and / or if the second temperature is greater than the ambient temperature when the ambient temperature is greater than a preset ambient temperature threshold, then controlling the opening of the second throttling valve to decrease at a preset first rate.

[0040] When using the above technical solution, condensation occurs because the temperature of the refrigerant on the radiator surface is lower than the ambient temperature. Condensation is more likely to form at low ambient temperatures. Adding a positive adjustment value to the ambient temperature is to set a safety margin to ensure that condensation does not occur on the refrigerant radiator surface. At high ambient temperatures, the risk of condensation on the refrigerant radiator surface is lower than at low temperatures; therefore, no adjustment value is added in this case.

[0041] In an optional technical solution of the control method for the above-mentioned air conditioning system, the control method further includes: exiting the second heat dissipation program when the component temperature is lower than the fourth preset temperature; wherein the third preset temperature is higher than the fourth preset temperature.

[0042] When the component temperature is lower than the fourth preset temperature, the temperature of the refrigerant radiator is already very low, and there is no need for all the refrigerant to enter the second throttling valve for throttling, so the second heat dissipation program is exited.

[0043] In the optional technical solution of the control method of the above-mentioned air conditioning system, after exiting the second heat dissipation program, the second on-off valve is controlled to open, the opening degree of the second throttle valve is controlled to fully open, and the opening degree of the first throttle valve is controlled to reduce the first preset opening degree.

[0044] After exiting the second heat dissipation program, the second on / off valve is opened, and the opening of the second throttle valve is fully opened to remove the throttling effect before the refrigerant radiator. No more special heat dissipation control is performed, and the opening of the first throttle valve is reduced to the first preset opening so that the first throttle valve can quickly reach the optimal opening.

[0045] In the optional technical solutions of the control method for the above-mentioned air conditioning system, after the step of "increasing the opening of the first throttle valve by a first preset opening" and / or after the step of "decreasing the opening of the first throttle valve by the first preset opening", the control method further includes: acquiring real-time operating parameter values; adjusting the opening of the first throttle valve based on the real-time operating parameter values ​​and preset target operating parameter values; the magnitude of the real-time operating parameter values ​​can change with the change of the throttle valve opening.

[0046] By adopting the above technical solutions, it is possible to ensure the heat dissipation of the refrigerant radiator while ensuring the stable operation of the unit and maintaining the optimal system state.

[0047] In the optional technical solutions of the control method of the above-mentioned air conditioning system, the operating parameter values ​​are suction superheat, tube temperature of the first heat exchanger, tube temperature of the second heat exchanger, or high pressure value. Attached Figure Description

[0048] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0049] Figure 1 is a schematic diagram of the air conditioning system of the present invention;

[0050] Figure 2 is a main flowchart of the control method of the air conditioning system of the present invention;

[0051] Figure 3 is a possible logic diagram of the air conditioning system control method of the present invention when executing the cooling mode;

[0052] Figure 4 is a possible logic diagram of the control method of the air conditioning system of the present invention when executing the heating mode.

[0053] Explanation of reference numerals in the attached figures:

[0054] 10-Compressor; 101-Inlet; 102-Outlet; 103-Make-up Inlet; 11-First Heat Exchanger; 111-Inlet of First Heat Exchanger; 12-First Throttling Valve; 13-Refrigerant Radiator; 14-Second Throttling Valve; 15-Second Heat Exchanger; 151-Inlet of Second Heat Exchanger; 20-First On / Off Valve; 21-Second On / Off Valve; 30-Four-Way Reversing Valve; 301-Inlet; 302-First Interface; 303-Second Interface; 304-Outlet; 40-Economizer; 50-Branch Pipe; 51-Throttle Element; 60-Second Temperature Sensor; 61-Third Temperature Sensor. Detailed Implementation

[0055] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications.

[0056] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly, referring to direct connection or indirect connection through an intermediate medium such as a refrigerant pipe. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The present invention provides an air conditioning system, as shown in FIG1. ​​The air conditioning system includes a compressor 10, a first heat exchanger 11, a first throttle valve 12, a refrigerant radiator 13, a second throttle valve 14, and a second heat exchanger 15 that are connected in sequence and form a circuit. It also includes a first on-off valve 20, which is connected in parallel with the first throttle valve 12. The refrigerant radiator 13 is used to dissipate heat for the heat dissipation components.

[0058] The first on / off valve 20 mentioned above can be a solenoid valve or a pneumatic valve, etc., as long as it can switch on and off, its specific structure can be adjusted. The first throttle valve 12 and the second throttle valve 14 can be electronic expansion valves or thermostatic expansion valves, etc., as long as they can throttle and have adjustable opening, their specific form can be adjusted. The heat dissipation component can be a driver board chip, processor, or power module of the air conditioning system, etc., which require heat dissipation. For ease of explanation, the heat dissipation component of this invention will be described below using a driver board chip as an example. The second heat exchanger 15 mentioned above can be a shell-and-tube heat exchanger to exchange heat between the refrigerant in the pipe and the fluid in the shell. The first heat exchanger 11 can be a finned heat exchanger to achieve heat exchange between the refrigerant and the air. Of course, this is not a limitation. The specific forms of the first heat exchanger 11 and the second heat exchanger 15 can be adjusted. For example, they can both be adjusted to plate heat exchangers, condenser tube bundle heat exchangers, or spiral tube heat exchangers, etc. The second heat exchanger 15 can be located on the outdoor side, and the first heat exchanger 11 can be located on the indoor side.

[0059] In one possible implementation, the air conditioning system of the present invention further includes a four-way reversing valve 30 and a second on-off valve 21. The second on-off valve 21 can be a solenoid valve or a pneumatic valve, etc., and its specific structural form can be adjusted as long as it can be switched on and off. The second on-off valve 21 is connected in parallel with the second throttle valve 14. The compressor 10 is connected to the first heat exchanger 11 and the second heat exchanger 15 through the four-way reversing valve 30. The exhaust port 102 of the compressor 10 is connected to the inlet 301 of the four-way reversing valve 30. The first port 302 of the four-way reversing valve 30 is connected to the air port 111 of the first heat exchanger. The suction port 101 of the compressor 10 is connected to the outlet 304 of the four-way reversing valve 30. The second port 303 of the four-way reversing valve 30 is connected to the air port 151 of the second heat exchanger.

[0060] The connections between the discharge port 102 of the compressor 10 and the inlet 301 of the four-way reversing valve 30, the connection between the first interface 302 and the gas port 111 of the first heat exchanger, the connection between the suction port 101 of the compressor 10 and the outlet 304 of the four-way reversing valve 30, and the connection between the second interface 303 of the four-way reversing valve 30 and the gas port 151 of the second heat exchanger can all be made using refrigerant pipes. Similarly, the connections between the liquid port of the first heat exchanger 11 and the first throttle valve 12, the connection between the first throttle valve 12 and the refrigerant radiator 13, the connection between the refrigerant radiator 13 and the second throttle valve 14, and the connection between the second throttle valve 14 and the liquid port of the second heat exchanger 15 can all be made using refrigerant pipes.

[0061] In one possible implementation, the compressor 10 of the present invention further includes an air inlet 103, and the air conditioning system further includes an economizer 40 and a throttling element 51. The throttling element 51 can be an electronic expansion valve, a capillary tube, a thermostatic expansion valve, or a throttling short tube, etc. The economizer 40 includes a first passage structure and a second passage structure that can exchange heat with each other. The first passage structure and the second passage structure can be configured as pipes or tube bundles. The first passage structure and the second passage structure can be arranged in the same housing to achieve mutual heat exchange. The housing is provided with a first opening, a second opening, a third opening, and a fourth opening. The two ends of the first passage structure can be connected to the first opening and the second opening respectively or pass through the first opening and the second opening respectively. The two ends of the second passage structure can be connected to the third opening and the fourth opening respectively or pass through the third opening and the fourth opening respectively. The first passage structure is connected to the refrigerant radiator 13 and the second throttle valve 14 at both ends, such as the first passage structure being located on the refrigerant pipe between the refrigerant radiator 13 and the second throttle valve 14; one end of the second passage structure is connected to the air inlet 103, such as the second passage structure being connected to the air inlet 103 via a refrigerant pipe; the other end of the second passage is connected to one end of the first passage structure via a branch pipe 50, for example, the other end of the second passage structure is connected to the first end of the branch pipe 50, and the second end of the branch pipe 50 is connected to the refrigerant pipe between the first passage structure and the second throttle valve 14, or the second end of the branch pipe 50 is connected to the refrigerant pipe between the first passage structure and the refrigerant radiator 13, etc.; wherein, the throttling element 51 is located on the branch pipe 50.

[0062] When the air conditioning system is in cooling mode, the inlet 301 of the four-way reversing valve 30 is connected to the first port 302 of the four-way reversing valve 30, and the second port 303 of the four-way reversing valve 30 is connected to the outlet 304 of the four-way reversing valve 30. The refrigerant discharged from the compressor 10 flows sequentially to the parallel structure of the first heat exchanger 11, the first throttle valve 12 and the first on / off valve 20, the refrigerant radiator 13, and the first passage structure of the economizer 40. Then it splits into two paths: one path flows sequentially to the parallel structure of the second throttle valve 14 and the second on / off valve 21, the second heat exchanger 15, and then returns to the suction port 101 of the compressor 10; the other path flows through the branch pipe 50 to the throttling element 51, and after being throttled by the throttling element 51, it flows to the second passage structure of the economizer 40, and then returns to the gas supply port 103 of the compressor 10.

[0063] When the air conditioning system is in heating mode, the inlet 301 of the four-way reversing valve 30 is connected to the second port 303 of the four-way reversing valve 30, and the first port 302 of the four-way reversing valve 30 is connected to the outlet 304 of the four-way reversing valve 30. The refrigerant discharged from the compressor 10 flows sequentially to the parallel structure of the second heat exchanger 15, the second throttle valve 14, and the second on-off valve 21. Then it is divided into two paths. One path flows sequentially to the first passage structure of the economizer 40, the refrigerant radiator 13, the parallel structure of the first throttle valve 12 and the first on-off valve 20, and the first heat exchanger 11, and then returns to the suction port 101 of the compressor 10. The other path flows through the branch pipe 50 to the throttling element 51, and after being throttled by the throttling element 51, it flows to the second passage structure of the economizer 40, and then returns to the air supply port 103 of the compressor 10.

[0064] In one possible implementation, the air conditioning system of the present invention further includes a first temperature sensor, a second temperature sensor 60, a third temperature sensor 61, and an ambient temperature sensor. The first temperature sensor is used to detect the temperature of the driver board chip. For ease of explanation, the temperature of the driver board chip will be referred to as the component temperature below. The first temperature sensor can be disposed on the driver board or fixedly disposed around the driver board, such as at a distance of 2 cm from the driver board chip. As long as the first temperature sensor can detect the temperature of the driver board chip, its specific setting can be adjusted. The second temperature sensor 60 is disposed on the refrigerant pipe between the first throttle valve 12 and the refrigerant radiator 13, or disposed on the refrigerant port of the refrigerant radiator 13 near the first throttle valve 12, so as to detect the first temperature Trc of the refrigerant flowing out through the first throttle valve 12. The third temperature sensor 61 is disposed on the refrigerant pipe between the refrigerant radiator 13 and the first passage structure, or disposed on the refrigerant port of the refrigerant radiator 13 near the first passage structure, so as to detect the second temperature Trh of the refrigerant flowing out through the first passage structure. The ambient temperature sensor is used to detect the ambient temperature. The present invention does not limit its placement location, as long as it can detect the ambient temperature. For example, when the refrigerant radiator 13 is located on the indoor side, the ambient temperature sensor can also be placed at a certain location on the indoor side, such as at the air inlet of the indoor unit including the first heat exchanger 11. Similarly, when the refrigerant radiator 13 is located on the outdoor side, the ambient temperature sensor can also be placed at a certain location on the outdoor side.

[0065] This invention does not limit the specific form of the refrigerant radiator 13. For example, the refrigerant radiator 13 includes bent refrigerant pipes, with the drive plate directly mounted on the refrigerant pipes. Alternatively, the refrigerant radiator 13 includes bent refrigerant pipes housed within a housing, with the drive plate directly mounted on the housing surface to utilize the refrigerant in the pipes for heat dissipation. Or, the refrigerant radiator 13 can be designed as a parallel multi-layered plate-like cavity structure, with refrigerant flowing through each layer. The drive plate chip can be mounted between these layers, or placed at the top or bottom of the multi-layered structure, to achieve heat exchange with the refrigerant in the plate-like cavity structure. As long as the refrigerant radiator 13 is configured to dissipate heat with the drive plate chip, its specific structural form can be adjusted, and these adjustments do not deviate from the principles of this invention and are all within the scope of protection of this invention.

[0066] It is possible that gas-liquid separators are installed on the refrigerant pipe between the second heat exchanger 15 and the second throttle valve 14, and on the refrigerant pipe between the outlet 304 of the four-way reversing valve 30 and the suction port 101 of the compressor 10.

[0067] Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0068] For example, the present invention can omit at least one of the economizer 40, the gas-liquid separator, and the four-way directional valve 30. When the four-way directional valve 30 is omitted, the second shut-off valve 21 and the third temperature sensor 61 can also be omitted.

[0069] It should be noted that although the above describes the connection between components using refrigerant pipes, direct connection can also be used.

[0070] As an alternative implementation, the structure of the economizer 40 of the present invention is not fixed. For example, the shell can be omitted, or it can be designed as a spiral heat exchanger structure. As long as heat exchange can be performed between the first passage structure and the second passage structure, these adjustments do not deviate from the principle of the present invention and are all within the protection scope of the present invention.

[0071] The air conditioning system of the present invention also includes a memory adapted to store multiple lines of program code, which are adapted to be loaded and executed by a processor to perform the control method of the air conditioning system described below. The memory includes, but is not limited to, random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory, or registers, etc., and the processor includes, but is not limited to, CPLD / FPGA, DSP, ARM processor, MIPS processor, etc. These well-known structures are not shown in the accompanying drawings to avoid unnecessarily obscuring the embodiments of this disclosure.

[0072] The control method of the air conditioning system of the present invention is described below. As shown in Figure 2, the control method of the air conditioning system of the present invention includes the following steps.

[0073] Step S100: Obtain component temperature.

[0074] That is, the component temperature is obtained through the first temperature sensor.

[0075] Step S200: Based on the component temperature, control the opening and closing of the first on / off valve, and adjust the opening degree of the first throttle valve and the second throttle valve.

[0076] It is understood that the control method of the air conditioning system of the present invention is executed during the operation of the air conditioning system, with the compressor in the start-up state. Possibly, when the component temperature exceeds a first preset temperature for a first preset time—that is, when the component temperature has reached the temperature requiring heat dissipation of the drive board chip—failure to dissipate heat in time may lead to unit frequency limitation. In this case, the opening and closing of the first on-off valve is controlled, and the opening degrees of the first throttle valve and the second throttle valve are adjusted. The purpose of ensuring the component temperature exceeds the first preset temperature for a first preset time is to avoid reacting to short-term temperature fluctuations, thereby reducing false alarms and frequent control actions. Of course, the present invention can also control the opening and closing of the first on-off valve and adjust the opening degrees of the first throttle valve and the second throttle valve as soon as the component temperature exceeds the first preset temperature. The first preset temperature can be the critical temperature that causes unit frequency limitation, which can be 84-88℃, specifically 85℃. The first preset time can be set based on experiments or experience, for example, 1-5 minutes, specifically 2 minutes. Of course, the above values ​​are not limiting; the specific values ​​can be adjusted according to actual applications.

[0077] The step of “controlling the opening and closing of the first on / off valve and adjusting the opening of the first throttle valve and the second throttle valve” can be a step in the first heat dissipation procedure or a step in the second heat dissipation procedure.

[0078] Possibly, the first heat dissipation procedure is only executed when the air conditioning system is in cooling mode. In this mode, the inlet of the four-way reversing valve is connected to the first port of the four-way reversing valve, and the second port of the four-way reversing valve is connected to the outlet of the four-way reversing valve, so that the refrigerant discharged from the compressor releases heat in the first heat exchanger and absorbs heat in the second heat exchanger.

[0079] The first heat dissipation procedure may further include the following steps:

[0080] Step S201: Control the first on / off valve to close.

[0081] The second on-off valve can be closed simultaneously with the first on-off valve. Alternatively, if the second on-off valve is already closed, it can remain closed without requiring it to be closed.

[0082] Step S202: Control the opening of the second throttle valve to increase the first preset opening.

[0083] Because the diameter of the first throttling valve is much smaller than that of the first on / off valve, after the first on / off valve is closed, all the refrigerant flowing out of the first heat exchanger enters the first throttling valve for throttling, thereby lowering the temperature of the refrigerant entering the refrigerant radiator. This increases the temperature difference with the driver board chip, achieving effective heat dissipation for the refrigerant radiator. In this case, to avoid excessive total throttling and a rapid drop in low pressure, the opening of the second throttling valve is increased by a first preset opening. The specific value of the first preset opening can be adjusted and optimized according to actual needs and system parameters, and can be determined through experimental testing and simulation analysis. Typically, the value of the first preset opening ranges from 90P to 110P, preferably 100P. Of course, the above values ​​are not restrictive, and the specific values ​​can be adjusted according to actual applications.

[0084] Step S203: Based on the component temperature, adjust the opening of the first throttle valve to keep the component temperature within the preset temperature range.

[0085] After the above adjustments, the component temperature will change. In this case, based on the component temperature, the opening of the first throttle valve is adjusted to keep the component temperature within the preset temperature range, thereby ensuring that the component temperature is within a reasonable temperature range.

[0086] Possibly, step S203 may further include:

[0087] When the component temperature is higher than the second preset temperature, the opening of the first throttle valve is reduced at a preset first rate. When the component temperature is less than or equal to the second preset temperature and greater than or equal to the third preset temperature, the opening of the first throttle valve remains unchanged. When the component temperature is lower than the third preset temperature, the opening of the first throttle valve is increased at a first rate. The first preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the third preset temperature. Through the above adjustments, the component temperature can be kept within a preset temperature range that is less than or equal to the second preset temperature and greater than or equal to the third preset temperature. This preset temperature range ensures the normal operation of the air conditioning system. For example, the second preset temperature range is 78℃-81℃, preferably 80℃, and the third preset temperature range is 72℃ to 76℃, preferably 75℃. The value of the first rate can be determined based on the system response speed, the rate of change of component temperature, etc. For example, the first rate can be 1P / min-10P / min, or adjusting the original opening by 1%-3% per minute, etc. Of course, the above values ​​are not restrictive, and the specific values ​​can be adjusted according to actual applications.

[0088] In one possible implementation, when the component temperature is >80°C, the driver board chip temperature may be too high. The opening of the first throttle valve is reduced at a rate of 5P / min to decrease the opening of the first throttle valve, thereby reducing the temperature of the refrigerant entering the refrigerant heat sink, increasing the temperature difference between the refrigerant heat sink and the driver board chip, and further reducing the driver board chip temperature. When the component temperature is 75°C ≤ Component temperature ≤ 80°C, the opening of the first throttle valve is kept constant to maintain the driver board chip temperature within a reasonable temperature range. When the component temperature is <75°C, the driver board chip temperature is low. The opening of the first throttle valve is increased at a rate of 5P / min to increase the opening of the first throttle valve, increasing the temperature of the refrigerant entering the refrigerant heat sink, reducing the temperature difference between the refrigerant heat sink and the driver board chip, and further increasing the driver board chip temperature. This control method can adjust the component temperature to a preset temperature range.

[0089] The above control method, through the coordinated adjustment of the throttle valve and the on / off valve, ensures that the refrigerant radiator effectively dissipates heat from the driver board chip, while also ensuring stable unit operation and maintaining optimal system status.

[0090] As one possible implementation, the control method of the present invention further includes: acquiring the first temperature of the refrigerant flowing out after throttling through the first throttling valve via a second temperature sensor, and acquiring the ambient temperature via an ambient temperature sensor. If the ambient temperature is less than a preset ambient temperature threshold, and the first temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then the opening of the first throttling valve is controlled to decrease at a preset first rate. If the ambient temperature is greater than a preset ambient temperature threshold, and the first temperature is greater than the ambient temperature, then the opening of the first throttling valve is controlled to decrease at a preset first rate. The ambient temperature threshold and adjustment value can be determined experimentally or empirically. The range of the ambient temperature threshold can be 28°C to 32°C, preferably 30°C. The range of the adjustment value can be 3°C to 7°C, preferably 5°C. Of course, the above values ​​are not limiting; the specific values ​​can be adjusted according to actual applications.

[0091] As one possible implementation, when the ambient temperature is <30°C, if the first temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in cooling mode) is > ambient temperature + 5°C, the opening of the first throttle valve is controlled to decrease at a preset first rate. In other words, when the ambient temperature is <30°C, if the first temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in cooling mode) ≤ ambient temperature + 5°C, the opening of the first throttle valve is not allowed to close further. Condensation occurs because the temperature of the refrigerant on the radiator surface is lower than the ambient temperature. Since condensation easily forms at low ambient temperatures, adding 5°C to the ambient temperature is to set a safety margin to ensure that condensation does not occur on the refrigerant radiator surface.

[0092] When the ambient temperature is ≥30℃, the opening of the first throttle valve is controlled to decrease at a preset first rate only if the first temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in cooling mode) is greater than the ambient temperature. In other words, when the ambient temperature is ≥30℃, if the first temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in cooling mode) is less than or equal to the ambient temperature, the opening of the first throttle valve is not allowed to close further. At high ambient temperatures, the risk of condensation on the surface of the refrigerant radiator is lower than at low temperatures; therefore, no adjustment is made in this case, and the opening of the first throttle valve can be controlled to decrease at a preset first rate if the first temperature is greater than the ambient temperature.

[0093] Step S300: Obtain real-time operating parameter values; adjust the opening of the second throttle valve based on the real-time operating parameter values ​​and the preset target operating parameter values.

[0094] Steps S203 and S300 can be executed in parallel or in reverse order. The real-time operating parameter values ​​can vary with the opening degree of the first and / or second throttle valves. The operating parameter values ​​can be suction superheat, the tube temperature of the first heat exchanger, the tube temperature of the second heat exchanger, or the high-pressure value, etc. The high-pressure value is the pressure of the refrigerant at the compressor's discharge port, which can be monitored and obtained in real time by installing a pressure sensor on the refrigerant pipe connected to the discharge port. The tube temperature of the second heat exchanger can be monitored or obtained in real time by installing a temperature sensor on the second heat exchanger. The tube temperature of the first heat exchanger can be monitored or obtained in real time by installing a temperature sensor on the first heat exchanger. The suction superheat can be obtained using existing technology. In one embodiment, the suction superheat is determined by the difference between the suction temperature of the air conditioning system and the suction-side pressure saturation temperature. The suction temperature is detected by a temperature sensor installed on the compressor's suction side, and the suction-side pressure saturation temperature is calculated by detecting the suction-side pressure.

[0095] Step S300 refers to adjusting the opening of the second throttle valve to ensure that the real-time operating parameter value reaches the preset target operating parameter value. Taking the suction superheat as an example, when the suction superheat is less than the target superheat, the opening of the second throttle valve is decreased to increase the suction superheat; when the suction superheat is greater than the target superheat, the opening of the second throttle valve is increased to decrease the suction superheat; and when the suction superheat equals the target superheat, the opening of the second throttle valve is kept constant. This ensures stable operation of the air conditioning system unit and maintains optimal system condition. The target operating parameter value can be adjusted according to the specific air conditioning system design and application environment. For example, the target suction superheat value can range from 0℃ to 5℃, such as 2℃.

[0096] As one possible implementation, the first heat dissipation program exits when the component temperature is lower than a fourth preset temperature. The third preset temperature is higher than the fourth preset temperature. The fourth preset temperature refers to a temperature where the refrigerant radiator is already low enough that not all refrigerant needs to enter the first throttling valve for throttling, thus exiting the first heat dissipation program. This fourth preset temperature can range from 62°C to 68°C, preferably 65°C. However, this is not a limitation, and the specific value can be adjusted according to the actual application. Furthermore, the first heat dissipation program exits only when the component temperature remains below the fourth preset temperature for a second preset time. This avoids reacting to short-term temperature fluctuations, reducing false alarms and frequent control actions. The second preset time can be set based on experiments or experience, for example, 1-5 minutes, specifically 3 minutes. Again, the above values ​​are not limiting, and the specific values ​​can be adjusted according to the actual application.

[0097] As one possible implementation, after exiting the first heat dissipation program, the first on / off valve is opened, and the opening of the first throttle valve is fully opened, for example, the opening of the first throttle valve is increased to 480P, so as to remove the throttling effect before the refrigerant radiator and no longer perform special heat dissipation control. The opening of the second throttle valve is reduced to the first preset opening so that the second throttle valve can quickly reach the optimal opening.

[0098] Furthermore, after the step of controlling the opening of the second throttle valve to decrease the first preset opening, the control method of the present invention further includes: acquiring real-time operating parameter values, and adjusting the opening of the second throttle valve based on the real-time operating parameter values ​​and the preset target operating parameter values. The specific adjustment method is described in step S300 and will not be repeated here.

[0099] In cooling mode, the refrigerant exchanges heat with the driver board chip after passing through the refrigerant radiator, which raises its temperature. After the refrigerant reaches the economizer, it exchanges heat with the low-temperature refrigerant in the second channel structure in the first channel structure, so that the refrigerant temperature is maintained within a reasonable range and the cooling efficiency of the system is guaranteed.

[0100] Possibly, the second heat dissipation procedure is only executed when the air conditioning system is in heating mode. In this mode, the inlet of the four-way reversing valve is connected to the second port of the four-way reversing valve, and the first port of the four-way reversing valve is connected to the outlet of the four-way reversing valve, so that the refrigerant discharged from the compressor releases heat in the second heat exchanger and absorbs heat in the first heat exchanger.

[0101] The second heat dissipation process may further include the following steps:

[0102] Step S204: Control the second on / off valve to close.

[0103] The first on-off valve can be closed while the second on-off valve is being closed. Alternatively, if the first on-off valve is already closed, it can remain closed without needing to be closed.

[0104] Step S205: Control the opening of the first throttle valve to increase the first preset opening.

[0105] Because the diameter of the second throttling valve is much smaller than that of the second on-off valve, after the second on-off valve is closed, all the refrigerant flowing out of the second heat exchanger enters the second throttling valve for throttling. This lowers the temperature of the refrigerant entering the refrigerant radiator, increasing the temperature difference with the driver board chip and achieving effective heat dissipation from the refrigerant radiator. In this case, to avoid excessive total throttling and a rapid drop in low pressure, the opening of the first throttling valve is increased by a first preset opening. The specific value of the first preset opening can be adjusted and optimized according to actual needs and system parameters, and can be determined through experimental testing and simulation analysis. Typically, the value of the first preset opening ranges from 90P to 110P, preferably 100P. Of course, the above values ​​are not restrictive, and the specific values ​​can be adjusted according to actual applications.

[0106] Step S206: Based on the component temperature, adjust the opening of the second throttle valve to keep the component temperature within the preset temperature range.

[0107] After the above adjustments, the component temperature will change. In this case, based on the component temperature, the opening of the second throttle valve is adjusted to keep the component temperature within the preset temperature range, thereby ensuring that the component temperature is within a reasonable temperature range.

[0108] Possibly, step S206 may further include:

[0109] When the component temperature is higher than the second preset temperature, the opening of the second throttle valve is reduced at a preset first rate. When the component temperature is less than or equal to the second preset temperature and greater than or equal to the third preset temperature, the opening of the second throttle valve remains unchanged. When the component temperature is lower than the third preset temperature, the opening of the second throttle valve is increased at a first rate. The first preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the third preset temperature. Through the above adjustments, the component temperature can be kept within a preset temperature range that is less than or equal to the second preset temperature and greater than or equal to the third preset temperature. This preset temperature range ensures the normal operation of the air conditioning system. For example, the second preset temperature range is 78℃-81℃, preferably 80℃, and the third preset temperature range is 72℃ to 76℃, preferably 75℃. The value of the first rate can be determined based on the system response speed, the rate of change of component temperature, etc. For example, the first rate can be 1P / min-10P / min, or adjusting the original opening by 1%-3% per minute, etc. Of course, the above values ​​are not restrictive, and the specific values ​​can be adjusted according to actual applications.

[0110] In one possible implementation, when the component temperature is >80°C, the driver board chip temperature may be too high. The opening of the second throttle valve is reduced at a rate of 5P / min to decrease the opening of the second throttle valve, thereby reducing the temperature of the refrigerant entering the refrigerant heat sink, increasing the temperature difference between the refrigerant heat sink and the driver board chip, and further reducing the driver board chip temperature. When the component temperature is 75°C ≤ component temperature ≤ 80°C, the opening of the second throttle valve is kept constant to maintain the driver board chip temperature within a reasonable temperature range. When the component temperature is <75°C, the driver board chip temperature is low. The opening of the second throttle valve is increased at a rate of 5P / min to increase the opening of the second throttle valve, increasing the temperature of the refrigerant entering the refrigerant heat sink, reducing the temperature difference between the refrigerant heat sink and the driver board chip, and further increasing the driver board chip temperature. This control method can adjust the component temperature to a preset temperature range.

[0111] The above control method, through the coordinated adjustment of the throttle valve and the on / off valve, ensures that the refrigerant radiator effectively dissipates heat from the driver board chip, while also ensuring stable unit operation and maintaining optimal system status.

[0112] As one possible implementation, the control method of the present invention further includes: detecting a second temperature of the refrigerant flowing out of the first passage structure using a third temperature sensor, and acquiring the ambient temperature using an ambient temperature sensor. If the ambient temperature is less than a preset ambient temperature threshold, and the second temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then the opening of the second throttle valve is controlled to decrease at a preset first rate. If the ambient temperature is greater than a preset ambient temperature threshold, and the second temperature is greater than the ambient temperature, then the opening of the second throttle valve is controlled to decrease at a preset first rate. The ambient temperature threshold and adjustment value can be determined experimentally or empirically. The range of the ambient temperature threshold can be from 28°C to 32°C, preferably 30°C. The range of the adjustment value can be from 3°C to 7°C, preferably 5°C. Of course, the above values ​​are not limiting; the specific values ​​can be adjusted according to the actual application.

[0113] As one possible implementation, when the ambient temperature is <30°C, if the second temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in heating mode) is > ambient temperature + 5°C, the opening of the second throttle valve is controlled to decrease at a preset first rate. In other words, when the ambient temperature is <30°C, if the second temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in heating mode) ≤ ambient temperature + 5°C, the opening of the second throttle valve is not allowed to close further. Condensation occurs because the temperature of the refrigerant on the radiator surface is lower than the ambient temperature. Since condensation easily forms at low ambient temperatures, adding 5°C to the ambient temperature is to set a safety margin to ensure that condensation does not occur on the refrigerant radiator surface.

[0114] When the ambient temperature is ≥30℃, the opening of the second throttle valve is controlled to decrease at a preset first rate only if the second temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in heating mode) is greater than the ambient temperature. In other words, when the ambient temperature is ≥30℃, if the second temperature (characterizing the temperature at the refrigerant inlet of the refrigerant radiator in heating mode) is less than or equal to the ambient temperature, the opening of the second throttle valve is not allowed to close further. At high ambient temperatures, the risk of condensation on the surface of the refrigerant radiator is lower than at low temperatures; therefore, no adjustment is made in this case, and the opening of the second throttle valve can be controlled to decrease at a preset first rate if the second temperature is greater than the ambient temperature.

[0115] Step S400: Obtain real-time operating parameter values; adjust the opening of the first throttle valve based on the real-time operating parameter values ​​and the preset target operating parameter values.

[0116] Steps S206 and S400 can be executed in parallel or in reverse order. The real-time operating parameter values ​​can vary with the opening degree of the second throttle valve and / or the first throttle valve. The operating parameter values ​​can be suction superheat, the tube temperature of the second heat exchanger, the tube temperature of the first heat exchanger, or the high-pressure value, etc. The high-pressure value is the pressure of the refrigerant at the compressor's discharge port, which can be monitored and obtained in real time by installing a pressure sensor on the refrigerant pipe connected to the discharge port. The tube temperature of the first heat exchanger can be monitored or obtained in real time by installing a temperature sensor on the first heat exchanger. The tube temperature of the second heat exchanger can be monitored or obtained in real time by installing a temperature sensor on the second heat exchanger. The suction superheat can be obtained using existing technology. In one embodiment, the suction superheat is determined by the difference between the suction temperature of the air conditioning system and the suction-side pressure saturation temperature. The suction temperature is detected by a temperature sensor installed on the compressor's suction side, and the suction-side pressure saturation temperature is calculated by detecting the suction-side pressure.

[0117] Step S400 refers to adjusting the opening of the first throttle valve to ensure that the real-time operating parameter value reaches the preset target operating parameter value. Taking the suction superheat as an example, when the suction superheat is less than the target superheat, the opening of the first throttle valve is reduced to increase the suction superheat; when the suction superheat is greater than the target superheat, the opening of the first throttle valve is increased to decrease the suction superheat; and when the suction superheat equals the target superheat, the opening of the first throttle valve is kept constant. This ensures stable operation of the air conditioning system unit and maintains optimal system conditions. The target operating parameter value can be adjusted according to the specific air conditioning system design and application environment. For example, the target suction superheat value can range from 0°C to 5°C, such as 2°C.

[0118] As one possible implementation, the second heat dissipation program exits when the component temperature is lower than a fourth preset temperature. The third preset temperature is higher than the fourth preset temperature. The fourth preset temperature refers to a temperature where the refrigerant radiator is already low enough that not all refrigerant needs to enter the second throttling valve for throttling, thus exiting the second heat dissipation program. This fourth preset temperature can range from 62°C to 68°C, preferably 65°C. However, this is not a limitation, and the specific value can be adjusted according to the actual application. Furthermore, the second heat dissipation program exits only when the component temperature remains below the fourth preset temperature for a second preset time. This avoids reacting to short-term temperature fluctuations, reducing false alarms and frequent control actions. The second preset time can be set based on experiments or experience, for example, 1-5 minutes, specifically 3 minutes. Again, the above values ​​are not limiting, and the specific values ​​can be adjusted according to the actual application.

[0119] As one possible implementation, after exiting the second heat dissipation procedure, the second on / off valve is opened, and the opening of the second throttle valve is fully opened, for example, the opening of the second throttle valve is increased to 480P, so as to remove the throttling effect before the refrigerant radiator, and no special heat dissipation control is performed. The opening of the first throttle valve is reduced to the first preset opening so that the first throttle valve can quickly reach the optimal opening.

[0120] Furthermore, after the step of controlling the opening of the first throttle valve to decrease to a first preset opening, the control method of the present invention further includes: acquiring real-time operating parameter values, and adjusting the opening of the first throttle valve based on the real-time operating parameter values ​​and a preset target operating parameter value. The specific adjustment method is described in step S400 and will not be repeated here.

[0121] In heating mode, the refrigerant in the first channel structure of the economizer exchanges heat with the low-temperature refrigerant in the second channel structure, thereby further reducing the refrigerant temperature and ensuring the effective operation of the refrigerant radiator.

[0122] In summary, the control method of this invention can prevent the driver board chip from overheating, regardless of whether the air conditioning system is in cooling or heating mode, thus solving the problem of limited compressor frequency and insufficient capacity due to insufficient heat dissipation of the driver board chip. While ensuring heat dissipation of the refrigerant radiator, it also ensures stable operation of the air conditioning system and maintains optimal system conditions. Furthermore, when the air conditioning system uses high-temperature refrigerant (such as R290), it can still effectively dissipate heat from the driver board chip, ensuring that the temperature of the refrigerant after condensation is at least below 70°C. Moreover, the air conditioning system and its control method of this invention do not require air cooling of the refrigerant radiator. Since air cooling is not required, there is no risk of leakage, fire, or explosion due to the inability to completely seal the electrical control box.

[0123] The following describes a possible control method for executing the cooling mode of the present invention. As shown in Figure 3, it includes the following steps:

[0124] Step S501: Obtain the component temperature Tf.

[0125] Step S502: Determine if Tf > 85℃ and lasts for 2 minutes? If yes, proceed to step S503; otherwise, proceed to step S501.

[0126] Step S503: Control the first on / off valve and the second on / off valve to close.

[0127] Step S504: Increase the opening of the second throttle valve by 100P.

[0128] Step S505: Adjust the opening of the second throttle valve based on the real-time intake superheat and the target intake superheat.

[0129] Step S506: Determine if Tf > 80℃? If yes, proceed to step S507; otherwise, proceed to step S512.

[0130] Step S507: Obtain the ambient temperature Tao and the refrigerant inlet temperature Trc of the refrigerant radiator.

[0131] Step S508: Determine if Tao > 30℃? If yes, proceed to step S509; otherwise, proceed to step S510.

[0132] Step S509: Determine if Trc > Tao? If yes, proceed to step S511; otherwise, proceed to step S507.

[0133] Step S510: Determine if Trc > Tao + 5? If yes, proceed to step S511; otherwise, proceed to step S507.

[0134] Step S511: Control the opening of the first throttle valve to decrease at a first rate.

[0135] Step S512: Determine if Tf < 75℃? If yes, proceed to step S514; otherwise, proceed to step S513.

[0136] Step S513: Keep the opening of the first throttle valve unchanged.

[0137] Step S514: Determine if Tf < 65℃ and lasts for 3 minutes? If yes, proceed to step S516; otherwise, proceed to step S515.

[0138] Step S515: Control the opening of the first throttle valve to increase at a first rate.

[0139] Step S516: Control the first on / off valve to open, control the first throttle valve to fully open, and control the second throttle valve to reduce its opening by 100P.

[0140] Step S517: Adjust the opening of the second throttle valve based on the real-time intake superheat and the target intake superheat.

[0141] The following describes a possible control method for executing the heating mode of the present invention. As shown in Figure 4, it includes the following steps:

[0142] Step S601: Obtain the component temperature Tf.

[0143] Step S602: Determine if Tf > 85℃ and lasts for 2 minutes? If yes, proceed to step S603; otherwise, proceed to step S601.

[0144] Step S603: Control the first on / off valve and the second on / off valve to close.

[0145] Step S604: Increase the opening of the first throttle valve by 100P.

[0146] Step S605: Adjust the opening of the first throttle valve based on the real-time intake superheat and the target intake superheat.

[0147] Step S606: Determine if Tf > 80℃? If yes, proceed to step S607; otherwise, proceed to step S612.

[0148] Step S607: Obtain the ambient temperature Tao and the refrigerant inlet temperature Thr of the refrigerant radiator.

[0149] Step S608: Determine if Tao > 30℃? If yes, proceed to step S609; otherwise, proceed to step S610.

[0150] Step S609: Determine if Trh > Tao? If yes, proceed to step S611; otherwise, proceed to step S607.

[0151] Step S610: Determine if Trh > Tao + 5? If yes, proceed to step S611; otherwise, proceed to step S607.

[0152] Step S611: Control the opening of the second throttle valve to decrease at a first rate.

[0153] Step S612: Determine if Tf < 75℃? If yes, proceed to step S614; otherwise, proceed to step S613.

[0154] Step S613: Keep the opening of the second throttle valve unchanged.

[0155] Step S614: Determine if Tf < 65℃ and lasts for 3 minutes? If yes, proceed to step S616; otherwise, proceed to step S615.

[0156] Step S615: Control the opening of the second throttle valve to increase at a first rate.

[0157] Step S616: Control the second on / off valve to open, control the second throttle valve to fully open, and control the first throttle valve to reduce its opening by 100P.

[0158] Step S617: Adjust the opening of the first throttle valve based on the real-time intake superheat and the target intake superheat.

[0159] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An air conditioning system, characterized in that, The air conditioning system includes: The compressor, the first heat exchanger, the first throttle valve, the refrigerant radiator, the second throttle valve, and the second heat exchanger are connected in sequence to form a circuit. A first on / off valve, which is connected in parallel with the first throttle valve; The refrigerant radiator is used to dissipate heat from the heat dissipation components.

2. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes: A second on / off valve, which is connected in parallel with the second throttle valve; and / or The compressor is connected to the first heat exchanger and the second heat exchanger via the four-way reversing valve. The exhaust port of the compressor is connected to the inlet of the four-way reversing valve. The first port of the four-way reversing valve is connected to the gas port of the first heat exchanger. The suction port of the compressor is connected to the outlet of the four-way reversing valve. The second port of the four-way reversing valve is connected to the gas port of the second heat exchanger.

3. The air conditioning system according to claim 1 or 2, characterized in that, The compressor includes an air inlet; The air conditioning system also includes an economizer and a throttling element. The economizer includes a first passage structure and a second passage structure that can exchange heat with each other. The first passage structure is connected to the refrigerant radiator and the second throttling valve at its two ends respectively. One end of the second passage structure is connected to the gas inlet. The other end of the second passage is connected to one end of the first passage structure through a branch pipe. The throttling element is disposed on the branch pipe.

4. The air conditioning system according to claim 3, characterized in that, The air conditioning system also includes a first temperature sensor, which is used to detect the component temperature of the heat dissipation component.

5. The air conditioning system according to claim 4, characterized in that, The air conditioning system further includes a second temperature sensor, a third temperature sensor, and an ambient temperature sensor; the second temperature sensor is located between the first throttle valve and the refrigerant radiator, and is used to detect the first temperature of the refrigerant flowing out through the first throttle valve; the third temperature sensor is located between the refrigerant radiator and the first passage structure, and is used to detect the second temperature of the refrigerant flowing out through the first passage structure. The ambient temperature sensor is used to detect the ambient temperature.

6. A control method for an air conditioning system, characterized in that, The air conditioning system includes: The compressor, the first heat exchanger, the first throttle valve, the refrigerant radiator, the second throttle valve, and the second heat exchanger are connected in sequence to form a circuit. A first on / off valve, which is connected in parallel with the first throttle valve; The refrigerant radiator is used to dissipate heat for the heat dissipation components; A first temperature sensor is used to detect the component temperature of the heat dissipation component; The control method includes: Obtain the temperature of the component; Based on the temperature of the component, the opening and closing of the first on / off valve is controlled, and the opening degree of the first throttle valve and the second throttle valve is adjusted.

7. The control method for an air conditioning system according to claim 6, characterized in that, The step of "controlling the opening and closing of the first on / off valve based on the temperature of the component, and adjusting the opening degree of the first throttle valve and the second throttle valve" further includes: When the temperature of the component exceeds the first preset temperature, a first heat dissipation procedure is executed; The first heat dissipation procedure is as follows: Control the first on / off valve to close; The opening degree of the second throttle valve is increased by a first preset opening degree; Based on the component temperature, the opening of the first throttle valve is adjusted so that the component temperature is within a preset temperature range.

8. The control method for an air conditioning system according to claim 7, characterized in that, The step of "adjusting the opening of the first throttle valve based on the component temperature to bring the component temperature within a preset temperature range" further includes: When the temperature of the component is greater than the second preset temperature, the opening of the first throttle valve is controlled to decrease at a preset first rate. When the temperature of the component is less than or equal to the second preset temperature and greater than or equal to the third preset temperature, the opening degree of the first throttle valve is kept unchanged. When the temperature of the component is lower than the third preset temperature, the opening of the first throttle valve is controlled to increase at the first rate; Wherein, the first preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the third preset temperature.

9. The control method for an air conditioning system according to claim 8, characterized in that, The air conditioning system further includes a second temperature sensor and an ambient temperature sensor. The second temperature sensor is used to detect the first temperature of the refrigerant flowing out through the first throttling valve, and the ambient temperature sensor is used to detect the ambient temperature. The control method further includes: Obtain the first temperature and the ambient temperature; If the ambient temperature is less than a preset ambient temperature threshold, and the first temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then the opening of the first throttle valve is controlled to decrease at a preset first rate; and / or If the ambient temperature is greater than a preset ambient temperature threshold, the opening of the first throttle valve is controlled to decrease at a preset first rate only if the first temperature is greater than the ambient temperature.

10. The control method for an air conditioning system according to claim 8, characterized in that, The control method further includes: When the temperature of the component is lower than the fourth preset temperature, the first heat dissipation program is terminated; The third preset temperature is greater than the fourth preset temperature.

11. The control method for an air conditioning system according to claim 10, characterized in that, The control method further includes: After exiting the first heat dissipation program, the first on / off valve is opened, the opening of the first throttle valve is fully opened, and the opening of the second throttle valve is reduced to the first preset opening.

12. The control method for an air conditioning system according to claim 11, characterized in that, After the step of "controlling the opening of the second throttle valve to increase by a first preset opening", and / or after the step of "controlling the opening of the second throttle valve to decrease by the first preset opening", the control method further includes: Obtain real-time operating parameter values; Based on the real-time operating parameter values ​​and the preset target operating parameter values, adjust the opening of the second throttle valve; The value of the real-time operating parameter can change with the opening degree of the throttle valve.

13. The control method for an air conditioning system according to claim 7, characterized in that, The air conditioning system also includes: The second on / off valve is connected in parallel with the second throttle valve; The compressor is connected to the first heat exchanger and the second heat exchanger through the four-way reversing valve. The exhaust port of the compressor is connected to the inlet of the four-way reversing valve. The first port of the four-way reversing valve is connected to the gas port of the first heat exchanger. The suction port of the compressor is connected to the outlet of the four-way reversing valve. The second port of the four-way reversing valve is connected to the gas port of the second heat exchanger. The control method further includes: The first heat dissipation procedure is executed only when the inlet is connected to the first interface and the second interface is connected to the outlet.

14. The control method for an air conditioning system according to claim 13, characterized in that, Before the step of "increasing the opening of the second throttle valve by a first preset opening", the control method further includes: Control the second on / off valve to close.

15. The control method for an air conditioning system according to claim 13 or 14, characterized in that, The control method further includes: If the component temperature is greater than the first preset temperature when the inlet is connected to the second interface and the first interface is connected to the outlet, a second heat dissipation procedure is executed. The second heat dissipation procedure is as follows: Control the first on / off valve and the second on / off valve to close; The opening degree of the first throttle valve is increased by a first preset opening degree; Based on the component temperature, the opening of the second throttle valve is adjusted so that the component temperature is within a preset temperature range.

16. The control method for an air conditioning system according to claim 15, characterized in that, The step of "adjusting the opening of the second throttle valve based on the component temperature to bring the component temperature within a preset temperature range" further includes: When the temperature of the component is greater than the second preset temperature, the opening of the second throttle valve is controlled to decrease at a preset first rate; When the temperature of the component is less than or equal to the second preset temperature and greater than or equal to the third preset temperature, the opening degree of the second throttle valve is kept unchanged. When the temperature of the component is lower than the third preset temperature, the opening of the second throttle valve is controlled to increase at the first rate; Wherein, the first preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the third preset temperature.

17. The control method for an air conditioning system according to claim 16, characterized in that, The compressor includes an air inlet; The air conditioning system also includes an economizer and a throttling element. The economizer includes a first passage structure and a second passage structure that can exchange heat with each other. The first passage structure is connected to the refrigerant radiator and the second throttling valve at its two ends respectively. One end of the second passage structure is connected to the gas inlet. The other end of the second passage is connected to one end of the first passage structure through a branch pipe. The throttling element is disposed on the branch pipe. The air conditioning system also includes a third temperature sensor and an ambient temperature sensor. The third temperature sensor is used to detect the second temperature of the refrigerant flowing out through the first passage structure, and the ambient temperature sensor is used to detect the ambient temperature. The control method further includes: Obtain the second temperature and the ambient temperature; If the ambient temperature is less than a preset ambient temperature threshold, and the second temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then the opening of the second throttle valve is controlled to decrease at a preset first rate; and / or If the ambient temperature is greater than a preset ambient temperature threshold, and the second temperature is greater than the ambient temperature, then the opening of the second throttle valve is controlled to decrease at a preset first rate.

18. The control method for an air conditioning system according to claim 16, characterized in that, The control method further includes: When the temperature of the component is lower than the fourth preset temperature, the second heat dissipation program is terminated; The third preset temperature is greater than the fourth preset temperature.

19. The control method for an air conditioning system according to claim 18, characterized in that, After exiting the second heat dissipation program, the second on / off valve is opened, the second throttle valve is fully opened, and the opening of the first throttle valve is reduced to the first preset opening.

20. The control method for an air conditioning system according to claim 19, characterized in that, After the step of "controlling the opening of the first throttle valve to increase by a first preset opening", and / or after the step of "controlling the opening of the first throttle valve to decrease by the first preset opening", the control method further includes: Obtain real-time operating parameter values; Based on the real-time operating parameter values ​​and the preset target operating parameter values, adjust the opening of the first throttle valve; The value of the real-time operating parameter can change with the opening degree of the throttle valve.

21. The control method for an air conditioning system according to claim 12 or 20, characterized in that, The operating parameter values ​​are: intake superheat, tube temperature of the first heat exchanger, tube temperature of the second heat exchanger, or high pressure value.

Images