Air conditioning system and control method thereof

Abstract

The invention relates to the field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims to solve the problem that an existing air conditioning system cannot effectively dissipate heat of a heat dissipation part under the condition that stable operation of a unit is guaranteed. In order to achieve the purpose, the air conditioning system comprises a compressor, a first heat exchanger, a first throttling valve, a refrigerant radiator, a second throttling valve and a second heat exchanger which form a loop and are sequentially communicated. The first on-off valve is connected with the first throttle valve in parallel; the refrigerant radiator is used for dissipating heat for the heat dissipation component. According to the arrangement mode, the heat dissipation component can be effectively cooled under the condition that stable operation of the unit is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of air conditioners, and particularly provides an air conditioning system and a control method thereof. Background Art

[0002] Existing variable-frequency units mostly use a refrigerant radiator to dissipate heat for heat-dissipating components such as drive board chips. The refrigerant in the refrigerant radiator is the high-pressure medium-high temperature liquid refrigerant condensed by the high-pressure side heat exchanger. When the air-conditioning unit has too high a condensation pressure and a large demand for unit capacity, the temperature difference between the refrigerant temperature and the drive board chip is usually insufficient, resulting in poor heat dissipation of the drive board, and the unit frequency is restricted and cannot continue to increase, limiting the performance of the air-conditioning unit.

[0003] For example, when using high-temperature refrigerants such as R290 to produce high-temperature hot water, the refrigerant temperature after condensation still remains above 70°C, resulting in too small a temperature difference between the refrigerant radiator and the chip's limit operating temperature and poor heat dissipation effect. To alleviate the above problems, air-cooled heat dissipation can be used. However, in the case of using the air conditioner unit's fan for air-cooled heat dissipation, due to the low fan speed and small air volume during high-temperature hot water production, the heat exchange capacity is insufficient, so the chip heat dissipation requirements cannot be met.

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

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that the existing air conditioning system cannot effectively dissipate heat for heat-dissipating components while ensuring the 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 includes: a compressor, a first heat exchanger, a first throttle valve, a refrigerant radiator, a second throttle valve, and a second heat exchanger that are connected in series to form a loop; a first on-off valve, the first on-off valve being connected in parallel with the first throttle valve; and the refrigerant radiator is used for dissipating heat for heat-dissipating components.

[0007] In the case of adopting the above technical solution, after the compressor starts, the refrigerant flow direction is the compressor, the first heat exchanger, the parallel structure of the first throttle valve and the first on-off valve, the refrigerant radiator, the second throttle valve and the second heat exchanger, and then returns to the compressor. Among them, by controlling the opening and closing of the first on-off valve and adjusting the opening degrees of the first throttle valve and the second throttle valve, the temperature of the heat dissipation component can be ensured to be within a reasonable range. For example, when it is necessary to dissipate heat from the heat dissipation component, control the first on-off valve to close so that all the refrigerant can enter the first throttle valve for throttling before entering the refrigerant radiator, thereby reducing the refrigerant temperature to increase the temperature difference with the heat dissipation component and effectively dissipating heat from the heat dissipation component. In this case, in order to avoid excessive throttling and a rapid decrease in low pressure, the opening degree of the second throttle valve can be increased, and then the temperature of the heat dissipation component can be maintained within a reasonable range by adjusting the opening degree of the first throttle valve. When it is not necessary to dissipate heat from the heat dissipation component, the first on-off valve can be controlled to open, the first throttle valve can be controlled to be fully open to remove the throttling effect, and then the opening degree of the second throttle valve can be correspondingly controlled to decrease to exert the original throttling effect, thereby ensuring the stable operation of the unit. Therefore, the above setting method can effectively dissipate heat from the heat dissipation component while ensuring the stable operation of the unit.

[0008] In addition, when using a high-temperature refrigerant (such as R290) in the air-conditioning system, the driving board chip can also be effectively cooled, and the temperature of the refrigerant after condensation reaches at least below 70°C. In addition, there is no need to air-cool the refrigerant radiator. Since there is no need to use air cooling, there is no problem of leakage, fire, and explosion due to the fact that the electric control box cannot be completely sealed.

[0009] In an alternative technical solution of the above 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. 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. The second interface of the four-way reversing valve is connected to the gas port of the second heat exchanger.

[0010] In the case of adopting the above technical solution, it can be realized that whether the air-conditioning system is in the cooling mode or the heating mode, the situation of the driving board chip having too high a temperature can be avoided, and the problems of compressor frequency limitation and insufficient capacity due to insufficient heat dissipation of the driving board chip can be solved. While ensuring the heat dissipation of the refrigerant radiator, it can also ensure the stable operation of the air-conditioning system and maintain the best system state.

[0011] In the alternative technical solution of the above air-conditioning system, the compressor includes a gas supplement port; the air-conditioning system further 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 two ends of the first passage structure are respectively connected to the refrigerant radiator and the second throttle valve. One end of the second passage structure is connected to the gas supplement port, and the other end of the second passage is communicated with one end of the first passage structure through a branch pipe. The throttling element is arranged on the branch pipe.

[0012] In the case of adopting the above technical solution, for example, in the cooling mode, the refrigerant will exchange heat with the drive board chip after passing through the refrigerant radiator, and the temperature will increase. When the refrigerant reaches the economizer, it will exchange heat with the low-temperature refrigerant in the second passage structure in the first passage structure, so that the refrigerant temperature is maintained within a reasonable range, ensuring the refrigeration efficiency of the system.

[0013] In the alternative technical solution of the above air-conditioning system, the air-conditioning system further includes a first temperature sensor, and the first temperature sensor is used to detect the component temperature of the heat dissipation component.

[0014] In the case of adopting the above technical solution, the automatic detection of the temperature of the heat dissipation component can be realized, which is convenient for realizing automatic control.

[0015] In the alternative technical solution of the above 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 of 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 of the first passage structure; the ambient temperature sensor is used to detect the ambient temperature.

[0016] In the case of adopting the above technical solution, it is convenient to automatically detect the temperature of the refrigerant at the inlet of the refrigerant radiator in the cooling mode and the heating mode. Combining with the ambient temperature, it can accurately judge whether condensation will occur on the surface of the refrigerant radiator, so as to avoid the generation of condensation on the refrigerant radiator.

[0017] On the other hand, 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 that are connected in sequence to form a loop; a first on-off valve that is connected in parallel with the first throttle valve; the refrigerant radiator is used to dissipate heat for a heat dissipation component; a first temperature sensor that is used to detect the component temperature of the heat dissipation component; the control method comprising: obtaining the component temperature; based on the component temperature, controlling the opening and closing of the first on-off valve, and adjusting the opening degrees of the first throttle valve and the second throttle valve.

[0018] In the case of adopting the above technical solution, the opening and closing of the first on-off valve can be controlled, and the opening degrees of the first throttle valve and the second throttle valve can be adjusted to ensure that the temperature of the heat dissipation component is within a reasonable range and maintain the stability of the system.

[0019] In an alternative technical solution of the above control method for the air-conditioning system, the step of "based on the component temperature, controlling the opening and closing of the first on-off valve, and adjusting the opening degrees of the first throttle valve and the second throttle valve" further comprises: 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 by a first preset opening degree; based on the component temperature, adjusting the opening degree of the first throttle valve so that the component temperature is within a preset temperature range.

[0020] In the case of adopting the above technical solution, when the component temperature is greater than the first preset temperature, it means that heat needs to be dissipated for the heat dissipation component, so the first on-off valve is controlled to close, so that all the refrigerant can enter the first throttle valve for throttling before entering the refrigerant radiator, thereby reducing the refrigerant temperature to increase the temperature difference with the heat dissipation component and effectively dissipating heat for the heat dissipation component. In this case, in order to avoid excessive throttling and a rapid decrease in low pressure, the opening degree of the second throttle valve is increased, and then the opening degree of the first throttle valve is adjusted based on the component temperature to keep the temperature of the heat dissipation component within a reasonable range. Therefore, the above control method can effectively dissipate heat for the heat dissipation component while ensuring the stable operation of the unit.

[0021] In an alternative technical solution of the control method of the above air-conditioning system, the step of "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" further includes: when the component temperature is greater than a second preset temperature, controlling the opening degree 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 degree of the first throttle valve to remain unchanged; when the component temperature is less than the third preset temperature, controlling the opening degree 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] In the case of adopting the above technical solution, the component temperature can be within a preset temperature range, and the component temperature can be maintained within a reasonable temperature range.

[0023] In an alternative technical solution of the control method of the above 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 of the first throttle valve, and the ambient temperature sensor is used to detect the ambient temperature; the control method further includes: obtaining the first temperature and the ambient temperature; when the ambient temperature is less than a preset ambient temperature threshold, if the first temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then controlling the opening degree of the first throttle valve to decrease at a preset first rate; and / or when the ambient temperature is greater than a preset ambient temperature threshold, if the first temperature is greater than the ambient temperature, then controlling the opening degree of the first throttle valve to decrease at a preset first rate.

[0024] In the case of adopting the above technical solution, since the occurrence of condensation is caused by the temperature of the refrigerant on the radiator surface being lower than the ambient temperature, condensation is likely to form when the ambient temperature is low. Adding a positive adjustment value to the ambient temperature is to set a safety margin to ensure that condensation does not occur on the surface of the refrigerant radiator. In a high ambient temperature, the risk of condensation on the surface of the refrigerant radiator is lower than that in a low ambient temperature environment. Therefore, no adjustment value is added in this case.

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

[0026] When the component temperature is less than the fourth preset temperature, the temperature of the refrigerant radiator is already very low, and it is not necessary for all the refrigerant to enter the first throttle valve for throttling. Therefore, the first heat dissipation program is exited.

[0027] In an alternative technical solution of the control method of the above 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 be fully opened, and controlling the opening degree of the second throttle valve to be reduced by the first preset opening degree.

[0028] After exiting the first heat dissipation program, control the first on-off valve to open, control the opening degree of the first throttle valve to be fully opened to remove the throttling effect in front of the refrigerant radiator, and no longer perform special heat dissipation control, and control the opening degree of the second throttle valve to be reduced by the first preset opening degree so that the second throttle valve can quickly reach the optimal opening degree.

[0029] In an alternative technical solution of the control method of the above air-conditioning system, after the step of "controlling the opening degree of the second throttle valve to increase by the first preset opening degree", and / or after the step of "controlling the opening degree of the second throttle valve to be reduced by the first preset opening degree", the control method further includes: obtaining the real-time working parameter value; based on the real-time working parameter value and the preset target working parameter value, adjusting the opening degree of the second throttle valve; the magnitude of the real-time working parameter value can change with the change of the opening degree of the throttle valve.

[0030] In the case of adopting the above technical solution, while ensuring the heat dissipation of the refrigerant radiator, the stable operation of the unit can be ensured and the best system state can be maintained.

[0031] In an alternative technical solution of the control method of the above air-conditioning system, the air-conditioning system further includes: a second on-off valve, the second on-off valve is connected in parallel with the second throttle valve; a four-way reversing 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 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: only when the inlet is communicated with the first interface and the second interface is communicated with the outlet, the first heat dissipation program is executed.

[0032] In the case of adopting the above technical solution, when the air-conditioning system executes the refrigeration mode, while ensuring the stable operation of the unit, the heat dissipation components can be effectively dissipated.

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

[0034] In the case of adopting the above technical solution, precise control of the system operating parameters can be achieved, ensuring the operation stability of the air-conditioning system.

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

[0036] In the case of adopting the above technical solution, the air-conditioning system executes the heating mode, and the refrigerant flow direction is the compressor, the second heat exchanger, the second throttle valve, the economizer, the refrigerant radiator, the first throttle valve, and the first heat exchanger, and then returns to the compressor. When the component temperature is greater than the first preset temperature, it means that heat dissipation is required for the heat dissipation component. Then control the second on-off valve to close, so that all the refrigerant can enter the second throttle valve for throttling before entering the refrigerant radiator, thereby reducing the refrigerant temperature to increase the temperature difference with the heat dissipation component and effectively dissipate heat from the heat dissipation component. In this case, in order to avoid excessive throttling and a rapid decrease in low pressure, increase the opening degree of the first throttle valve, and then adjust the opening degree of the second throttle valve based on the component temperature to keep the temperature of the heat dissipation component within a reasonable range. Therefore, the above control method can effectively dissipate heat from the heat dissipation component while ensuring the stable operation of the unit.

[0037] In an alternative technical solution of the above control method for the air-conditioning system, the step of "based on the component temperature, adjust the opening degree of the second throttle valve so that the component temperature is within a preset temperature range" further includes: when the component temperature is greater than the second preset temperature, control the opening degree 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 the third preset temperature, control the opening degree of the second throttle valve to remain unchanged; when the component temperature is less than the third preset temperature, control the opening degree of the second throttle valve to increase at the first rate; where the first preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the third preset temperature.

[0038] In the case of adopting the above technical solution, the component temperature can be within a preset temperature range, keeping the component temperature within a reasonable temperature range.

[0039] In an alternative technical solution of the control method of the above air conditioning system, the compressor includes a gas supplement port; the air conditioning system further 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 two ends of the first passage structure are respectively connected to the refrigerant radiator and the second throttle valve. One end of the second passage structure is connected to the gas supplement port, 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 arranged on the branch pipe; the air conditioning system further 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 of the first passage structure, and the ambient temperature sensor is used to detect the ambient temperature; the control method further includes: obtaining the second temperature and the ambient temperature; when the ambient temperature is less than a preset ambient temperature threshold, if the second temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then control the opening degree of the second throttle valve to decrease at a preset first rate; and / or when the ambient temperature is greater than a preset ambient temperature threshold, if the second temperature is greater than the ambient temperature, then control the opening degree of the second throttle valve to decrease at a preset first rate.

[0040] In the case of adopting the above technical solution, since the occurrence of condensation is caused by the temperature of the refrigerant on the surface of the radiator being lower than the ambient temperature, condensation is likely to form when the ambient temperature is low. Adding the positive adjustment value to the ambient temperature is to set a safety margin to ensure that condensation does not occur on the surface of the refrigerant radiator. In a high ambient temperature, the risk of condensation on the surface of the refrigerant radiator is lower than that in a low-temperature environment. Therefore, no adjustment value is added in this case.

[0041] In an alternative technical solution of the control method of the above air conditioning system, the control method further includes: exiting the second cooling program when the component temperature is less than a fourth preset temperature; wherein, the third preset temperature is greater than the fourth preset temperature.

[0042] When the component temperature is less than the fourth preset temperature, the temperature of the refrigerant radiator is already very low, and it is not necessary for all the refrigerant to enter the second throttle valve for throttling. Therefore, the second cooling program is exited.

[0043] In an alternative technical solution of the control method of the above air conditioning system, after exiting the second cooling program, control the second on-off valve to open, control the opening degree of the second throttle valve to be fully opened, and control the opening degree of the first throttle valve to decrease by the first preset opening degree.

[0044] After exiting the second heat dissipation program, control the second on-off valve to open and fully open the opening degree of the second throttle valve to remove the throttling effect in front of the refrigerant radiator, no longer perform special heat dissipation control, and control the opening degree of the first throttle valve to decrease by a first preset opening degree so that the first throttle valve quickly reaches the optimal opening degree.

[0045] In an alternative technical solution of the control method of the above air-conditioning system, after the step of "controlling the opening degree of the first throttle valve to increase by a first preset opening degree", and / or after the step of "controlling the opening degree of the first throttle valve to decrease by the first preset opening degree", the control method further includes: obtaining a real-time working parameter value; adjusting the opening degree of the first throttle valve based on the real-time working parameter value and a preset target working parameter value; the magnitude of the real-time working parameter value can change with the change of the opening degree of the throttle valve.

[0046] In the case of adopting the above technical solution, while ensuring the heat dissipation of the refrigerant radiator, the stable operation of the unit can be ensured and the best system state can be maintained.

[0047] In an alternative technical solution of the control method of the above air-conditioning system, the working parameter value is the suction superheat degree, the pipe temperature of the first heat exchanger, the pipe temperature of the second heat exchanger or the high-pressure pressure value. Description of the Drawings

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

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

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

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

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

[0053] Description of the reference numerals:

[0054] 10 - Compressor; 101 - Suction port; 102 - Discharge port; 103 - Make-up air port; 11 - First heat exchanger; 111 - Air port of the first heat exchanger; 12 - First throttle valve; 13 - Refrigerant radiator; 14 - Second throttle valve; 15 - Second heat exchanger; 151 - Air port of the 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 manners

[0055] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0056] It should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "connected" and "connection" should be understood in a broad sense. It can be directly connected or indirectly connected through an intermediate medium such as a refrigerant pipe, etc. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] The present invention provides an air-conditioning system, as Figure 1 shown. 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 sequentially connected and form a loop. It further includes a first on-off valve 20, and the first on-off valve 20 is connected in parallel with the first throttle valve 12. The refrigerant radiator 13 is used to dissipate heat for the heat dissipation component.

[0058] The above-mentioned first on-off valve 20 can be an electromagnetic valve, a pneumatic valve, etc. As long as it can be turned on and off, its specific structural form can be adjusted. The first throttle valve 12 and the second throttle valve 14 can be electronic expansion valves, thermal expansion valves, etc. As long as they can throttle and the opening degree is adjustable, their specific forms can be adjusted. The heat dissipation component can be a driving board chip, a processor, a power module, etc. of the air-conditioning system that need to dissipate heat. For the convenience of description, the heat dissipation component of the present invention will be introduced by taking the driving board chip as an example in the following text. The above-mentioned second heat exchanger 15 can be a shell-and-tube heat exchanger to enable the refrigerant in the pipeline to exchange heat with the fluid in the shell, and 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 restrictive. The specific forms of the first heat exchanger 11 and the second heat exchanger 15 can be adjusted. For example, both can be adjusted to plate heat exchangers, condensation tube bundle heat exchangers, or spiral tube heat exchangers, etc. Among them, the second heat exchanger 15 can be arranged on the outdoor side, and the first heat exchanger 11 can be arranged on the indoor side.

[0059] As a possible implementation manner, 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 an electromagnetic valve, a pneumatic valve, etc. As long as it can be turned on and off, its specific structural form can be adjusted. Among them, 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 interface 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 interface 303 of the four-way reversing valve 30 is connected to the air port 151 of the second heat exchanger.

[0060] Among them, the connection between the exhaust 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 air 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 air port 151 of the second heat exchanger can all be connected by refrigerant pipes. Similarly, the connection 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 connected by refrigerant pipes.

[0061] As a possible implementation, the compressor 10 of the present invention further includes a gas replenishing port 103. 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, 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 heat exchange with each other. 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 respectively connected to the first opening and the second opening or respectively pass through the first opening and the second opening; the two ends of the second passage structure can be respectively connected to the third opening and the fourth opening or respectively pass through the third opening and the fourth opening. The first passage structure is communicated with the refrigerant radiator 13 and the second throttling valve 14 respectively through its two ends, for example, the first passage structure is arranged on the refrigerant pipe between the refrigerant radiator 13 and the second throttling valve 14; one end of the second passage structure is connected to the gas replenishing port 103, for example, one end of the second passage structure is connected to the gas replenishing port 103 through a refrigerant pipe; the other end of the second passage is communicated with one end of the first passage structure through 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 throttling 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 arranged on the branch pipe 50.

[0062] When the air-conditioning system executes the refrigeration mode, the inlet 301 of the four-way reversing valve 30 is communicated with the first interface 302 of the four-way reversing valve 30 and the second interface 303 of the four-way reversing valve 30 is communicated with the outlet 304 of the four-way reversing valve 30. The refrigerant discharged by the compressor 10 flows sequentially to the first heat exchanger 11, the first throttling valve 12 and the parallel structure of the first on-off valve 20, the refrigerant radiator 13, and the first passage structure of the economizer 40. Then it is divided into two paths. One path flows sequentially to the parallel structure of the second throttling 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, is throttled by the throttling element 51 and then flows to the second passage structure of the economizer 40, and then returns to the gas replenishing port 103 of the compressor 10.

[0063] When the air-conditioning system operates in the heating mode, the inlet 301 of the four-way reversing valve 30 communicates with the second interface 303 of the four-way reversing valve 30, and the first interface 302 of the four-way reversing valve 30 communicates with 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 gas supplement port 103 of the compressor 10.

[0064] As a possible implementation manner, 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 drive board chip. For the convenience of description, the temperature of the drive board chip is hereinafter referred to as the component temperature. The first temperature sensor can be arranged on the drive board, or fixedly arranged around the drive board, such as at a distance of 2 CM from the drive board chip. As long as the first temperature sensor can detect the temperature of the drive board chip, its specific setting manner can be adjusted. The second temperature sensor 60 is arranged on the refrigerant pipe between the first throttle valve 12 and the refrigerant radiator 13, or on the refrigerant port of the refrigerant radiator 13 close to the first throttle valve 12, so as to be able to detect the first temperature Trc of the refrigerant flowing out of the first throttle valve 12; the third temperature sensor 61 is arranged on the refrigerant pipe between the refrigerant radiator 13 and the first passage structure, or on the refrigerant port of the refrigerant radiator 13 close to the first passage structure, so as to be able to detect the second temperature Trh of the refrigerant flowing out of the first passage structure. The ambient temperature sensor is used to detect the ambient temperature, and the present invention places no restrictions on its installation position, as long as it can detect the ambient temperature; for example, when the refrigerant radiator 13 is arranged on the indoor side, the ambient temperature sensor can also be arranged at a certain position on the indoor side, such as at the air inlet of the indoor unit including the first heat exchanger 11; another example is when the refrigerant radiator 13 is arranged on the outdoor side, the ambient temperature sensor can also be arranged at a certain position on the outdoor side.

[0065] The present invention does not limit the specific form of the refrigerant radiator 13. For example, the refrigerant radiator 13 includes a bent refrigerant pipe, and the driving board is directly disposed on the refrigerant pipe. Or the refrigerant radiator 13 includes a refrigerant pipe having a bend, and these pipes are disposed in a housing, and the driving board can be directly mounted on the surface of the housing to dissipate heat by using the refrigerant in the refrigerant pipe. Or the refrigerant radiator 13 is designed as a parallel multi-layer plate-like cavity structure, and each layer has refrigerant passing through, and the driving board chip can be installed between these layers, or placed on the top or bottom of the multi-layer structure to achieve heat exchange with the refrigerant in the plate-like cavity structure. As long as the refrigerant radiator 13 is arranged to dissipate heat from the driving board chip, its specific structural form can be adjusted, and these adjustments do not deviate from the principle of the present invention and are within the protection scope of the present invention.

[0066] Possibly, a gas-liquid separator is provided 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 only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention. Those skilled in the art can make adjustments according to needs 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 reversing valve 30. When omitting the four-way reversing valve 30, the setting of the second on-off valve 21 and the third temperature sensor 61 can also be omitted.

[0069] It should be noted that although the above description is that the connection between components is made by a refrigerant pipe, it can also be connected by a direct connection method.

[0070] As an alternative embodiment, the structural form of the economizer 40 of the present invention is not fixed. For example, the setting of the housing can be omitted and it can be designed as a spiral heat exchanger structure, etc. As long as heat exchange can be achieved between the first passage structure and the second passage structure, these adjustments do not deviate from the principle of the present invention and are within the protection scope of the present invention.

[0071] The air conditioning system of the present invention further includes a memory, which is adapted to store multiple program codes. The program codes are adapted to be loaded and run by a processor to execute the control method of the air conditioning system of the present invention 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. The processor includes, but is not limited to, CPLD / FPGA, DSP, ARM processor, MIPS processor, etc. To avoid unnecessarily obscuring the embodiments of the present disclosure, these well-known structures are not shown in the drawings.

[0072] The control method of the air conditioning system of the present invention will be introduced below. As Figure 2 shown, the control method of the air conditioning system of the present invention includes the following steps.

[0073] Step S100: Obtain the component temperature.

[0074] That is, obtain the component temperature 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 degrees of the first throttle valve and the second throttle valve.

[0076] It can be understood that the control method of the air conditioning system of the present invention is executed during the operation of the air conditioning system, and the compressor is in the starting state. Possibly, when the component temperature is greater than the first preset temperature and lasts for the first preset time, that is, the component temperature has reached the temperature at which heat dissipation of the drive board chip is required. If heat dissipation is not carried out in time, it may cause the unit frequency to be limited. In such a case, the opening and closing of the first on-off valve are controlled, and the opening degrees of the first throttle valve and the second throttle valve are adjusted. Among them, the purpose of the component temperature being greater than the first preset temperature and lasting for the first preset time is to avoid reacting to short-term temperature fluctuations, thereby reducing false alarms and frequent control actions. Of course, in the present invention, the opening and closing of the first on-off valve can also be controlled and the opening degrees of the first throttle valve and the second throttle valve can be adjusted when the component temperature is greater than the first preset temperature. Among them, the first preset temperature can be the critical temperature that causes the unit frequency to be limited, and the first preset temperature can be 84 - 88°C, specifically 85°C. The first preset time can be set based on experiments or experience. For example, it can be 1 - 5 minutes, specifically 2 minutes. Of course, the above values are not restrictive, and their specific values can be adjusted according to actual applications.

[0077] Among them, "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" can be a step in the first heat dissipation program or a step in the second heat dissipation program.

[0078] Possibly, the first heat dissipation program is only executed when the air conditioning system is in the cooling mode. When the air conditioning system is in the cooling mode, the inlet of the four-way reversing valve is communicated with the first interface of the four-way reversing valve, and the second interface of the four-way reversing valve is communicated with the outlet of the four-way reversing valve, so that the refrigerant discharged by the compressor releases heat in the first heat exchanger and absorbs heat in the second heat exchanger.

[0079] Possibly, the first heat dissipation program further includes the following steps:

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

[0081] When controlling the first on-off valve to close, the second on-off valve can also be controlled to close. Or when the second on-off valve is already in the closed state, there is no need to control the second on-off valve to close, and it can be maintained in the closed state.

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

[0083] Since the diameter of the first throttle 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 throttle valve for throttling, so that the temperature of the refrigerant entering the refrigerant radiator is reduced, thereby increasing the temperature difference with the drive board chip and realizing effective heat dissipation of the refrigerant radiator. In this case, in order to avoid excessive total throttling and a rapid decrease in low pressure, the opening degree of the second throttle valve is increased by a first preset opening degree. Among them, the specific value of the first preset opening degree can be adjusted and optimized according to actual requirements and system parameters, and can be determined through experimental tests and simulation analyses. Generally, the value range of the first preset opening degree is 90P - 110P, preferably 100P. Of course, the above values are not restrictive, and their specific values can be adjusted according to actual applications.

[0084] Step S203: Based on the component temperature, adjust the opening degree of the first throttle valve so that the component temperature is within a preset temperature range.

[0085] After the above adjustment, the component temperature will change. In this case, based on the component temperature, adjust the opening degree of the first throttle valve so that the component temperature is within a preset temperature range, thereby ensuring that the component temperature is within a reasonable temperature range.

[0086] Possibly, step S203 further includes:

[0087] When the component temperature is greater than the second preset temperature, control the opening degree 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 the third preset temperature, control the opening degree of the first throttle valve to remain unchanged. When the component temperature is less than the third preset temperature, control the opening degree of the first throttle valve to increase at the first rate. Among them, 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 adjustment, the component temperature can be made to be in 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 can ensure the normal operation of the air conditioning system. For example, the value range of the second preset temperature is 78°C - 81°C, preferably 80°C, the value range of the third preset temperature is 72°C to 76°C, preferably 75°C, and the value of the first rate can be determined according to the system response speed, the change rate of the component temperature, etc. For example, the value of the first rate is 1P / min - 10P / min, or adjust 1% - 3% of the original opening degree per minute, etc. Of course, the above values are not restrictive, and their specific values can be adjusted according to actual applications.

[0088] In a possible specific implementation manner, when the component temperature > 80°C, the temperature of the drive board chip may be too high. Control the opening degree of the first throttle valve to decrease at a rate of 5P / min to reduce the opening degree of the first throttle valve, lower the temperature of the refrigerant entering the refrigerant radiator, increase the temperature difference between the refrigerant radiator and the drive board chip, and lower the temperature of the drive board chip; when 75°C ≤ component temperature ≤ 80°C, maintain the opening degree of the first throttle valve unchanged to keep the temperature of the drive board chip within a reasonable temperature range; when the component temperature < 75°C, the temperature of the drive board chip is relatively low. Control the opening degree of the first throttle valve to increase at a rate of 5P / min to increase the opening degree of the first throttle valve, increase the temperature of the refrigerant entering the refrigerant radiator, reduce the temperature difference between the refrigerant radiator and the drive board chip, and increase the temperature of the drive board chip. The above control method can adjust the component temperature to the preset temperature range.

[0089] The above control method, through the coordinated adjustment of the throttle valve and the on-off valve, while ensuring the effective heat dissipation of the refrigerant radiator to the drive board chip, can also ensure the stable operation of the unit and maintain the best system state.

[0090] As a possible implementation manner, the control method of the present invention further includes: obtaining the first temperature of the refrigerant flowing out after throttling by the first throttle valve through a second temperature sensor, and obtaining the ambient temperature through an ambient temperature sensor. When the ambient temperature is less than a preset ambient temperature threshold, if the first temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, the opening degree of the first throttle valve is controlled to decrease at a preset first rate. When the ambient temperature is greater than a preset ambient temperature threshold, if the first temperature is greater than the ambient temperature, the opening degree of the first throttle valve is controlled to decrease at a preset first rate. Among them, the ambient temperature threshold and the adjustment value can be determined through experiments or experience, etc. The value range of the ambient temperature threshold can be 28°C to 32°C, preferably 30°C. The value range of the adjustment value can be 3°C - 7°C, preferably 5°C. Of course, the above values are not restrictive, and their specific values can be adjusted according to actual applications.

[0091] As a possible specific implementation manner, when the ambient temperature < 30°C, if the first temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the refrigeration mode) > the ambient temperature + 5°C, the opening degree of the first throttle valve is controlled to decrease at a preset first rate. That is to say, when the ambient temperature < 30°C, if the first temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the refrigeration mode) ≤ the ambient temperature + 5°C, the opening degree of the first throttle valve is not allowed to be reduced. The occurrence of condensation is caused by the temperature of the refrigerant on the surface of the radiator being lower than the ambient temperature. Since condensation is likely to form when the ambient temperature is low, adding 5°C to the ambient temperature is to set a safety margin to ensure that condensation does not occur on the surface of the refrigerant radiator.

[0092] When the ambient temperature ≥ 30°C, if the first temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the refrigeration mode) > the ambient temperature, the opening degree of the first throttle valve is controlled to decrease at a preset first rate. That is to say, when the ambient temperature ≥ 30°C, if the first temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the refrigeration mode) ≤ the ambient temperature, the opening degree of the first throttle valve is not allowed to be reduced. In a high ambient temperature environment, the risk of condensation on the surface of the refrigerant radiator is lower than that in a low temperature environment. Therefore, in this case, no adjustment value is added. When the first temperature > the ambient temperature, the opening degree of the first throttle valve can be controlled to decrease at a preset first rate.

[0093] Step S300: Obtain the real-time working parameter value; based on the real-time working parameter value and the preset target working parameter value, adjust the opening degree of the second throttle valve.

[0094] Among them, step S203 and step S300 can be executed in parallel or in reverse. Among them, the magnitude of the real-time working parameter value can change with the change of the opening degree of the first throttle valve and / or the second throttle valve. The working parameter value can be the suction superheat degree, the tube temperature of the first heat exchanger, the tube temperature of the second heat exchanger, or the high-pressure pressure value, etc. Among them, the high-pressure pressure value is the pressure of the refrigerant at the exhaust port of the compressor, and can be monitored and obtained in real time by installing a pressure sensor on the refrigerant pipe connected to the exhaust 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 method for obtaining the suction superheat degree can be realized by using the existing technology. In one embodiment, the suction superheat degree is determined by the difference between the suction temperature of the air-conditioning system and the saturation temperature of the suction-side pressure. The suction temperature is detected by a temperature sensor arranged on the suction side of the compressor, and the saturation temperature of the suction-side pressure is obtained by calculation after detecting the suction-side pressure.

[0095] Step S300 refers to adjusting the opening degree of the second throttle valve so that the real-time working parameter value reaches the preset target working parameter value. Taking the working parameter value as the suction superheat degree as an example for illustration, when the suction superheat degree is less than the target superheat degree, the opening degree of the second throttle valve is reduced to increase the suction superheat degree; when the suction superheat degree is greater than the target superheat degree, the opening degree of the second throttle valve is increased to reduce the suction superheat degree; when the suction superheat degree is equal to the target superheat degree, the opening degree of the second throttle valve is maintained unchanged. Thus, the air-conditioning system unit operates smoothly and maintains the best system state. The value of the above-mentioned target working parameter value can be adjusted according to the specific air-conditioning system design and application environment. For example, the value range of the target suction superheat degree can be between 0°C and 5°C, for example, it is 2°C.

[0096] As a possible implementation manner, when the component temperature is less than the fourth preset temperature, the first heat dissipation program is exited. Among them, the third preset temperature is greater than the fourth preset temperature. The fourth preset temperature means that the temperature of the refrigerant radiator is already very low, and it is not necessary for all the refrigerant to enter the first throttle valve for throttling, so the first heat dissipation program is exited. The value range of this fourth preset temperature can be from 62°C to 68°C, preferably 65°C. Of course, this is not restrictive, and its specific value can be adjusted according to the actual application. Further, when the component temperature is less than the fourth preset temperature and lasts for the second preset time, the first heat dissipation program is exited. Thus, it is possible to avoid reacting to short-term temperature fluctuations, reduce false alarms and frequent control actions. The second preset time can be set based on experiments or experience. For example, it can be 1 - 5 minutes, specifically 3 minutes. Of course, the above values are not restrictive, and its specific value can be adjusted according to the actual application.

[0097] As a possible implementation, after exiting the first heat dissipation program, control the first on-off valve to open, and control the opening degree of the first throttle valve to be fully opened. For example, the opening degree of the first throttle valve is increased to 480P to remove the throttling effect in front of the refrigerant radiator, without performing special heat dissipation control, and control the opening degree of the second throttle valve to decrease by a first preset opening degree so that the second throttle valve quickly reaches the optimal opening degree.

[0098] Further, after the step of controlling the opening degree of the second throttle valve to decrease by a first preset opening degree, the control method of the present invention further includes: obtaining real-time working parameter values, and adjusting the opening degree of the second throttle valve based on the real-time working parameter values and preset target working parameter values. The specific adjustment method refers to step S300 and will not be elaborated here.

[0099] Among them, in the refrigeration mode, the refrigerant will exchange heat with the drive board chip after passing through the refrigerant radiator, and the temperature will increase. When the refrigerant reaches the economizer, it will exchange heat with the low-temperature refrigerant in the second passage structure in the first passage structure, so that the refrigerant temperature is maintained within a reasonable range to ensure the refrigeration efficiency of the system.

[0100] Possibly, the second heat dissipation program is executed only when the air conditioning system executes the heating mode. Among them, when the air conditioning system executes the heating mode, the inlet of the four-way reversing valve is communicated with the second interface of the four-way reversing valve, and the first interface of the four-way reversing valve is communicated with 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] Possibly, the second heat dissipation program further includes the following steps:

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

[0103] While controlling the second on-off valve to close, the first on-off valve can also be controlled to close. Or if the first on-off valve is already in the closed state, there is no need to control the first on-off valve to close, and it can be maintained in the closed state.

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

[0105] Since the orifice diameter of the second throttle 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 throttle valve for throttling, so that the temperature of the refrigerant entering the refrigerant radiator is reduced, increasing the temperature difference with the driving board chip to achieve effective heat dissipation of the refrigerant radiator. In this case, to avoid excessive total throttling and a rapid decrease in low pressure, the opening of the first throttle valve is increased by a first preset opening. The specific value of the first preset opening can be adjusted and optimized according to actual requirements and system parameters, and can be determined through experimental tests and simulation analyses. Generally, the value range of the first preset opening is 90P - 110P, preferably 100P. Of course, the above values are not restrictive, and their 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 so that the component temperature is within a preset temperature range.

[0107] After the above adjustment, the component temperature will change. In this case, based on the component temperature, adjust the opening of the second throttle valve so that the component temperature is within a preset temperature range, thus ensuring that the component temperature is within a reasonable temperature range.

[0108] Possibly, step S206 further includes:

[0109] When the component temperature is greater than the second preset temperature, control 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 the third preset temperature, control the opening of the second throttle valve to remain unchanged. When the component temperature is less than the third preset temperature, control 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. Through the above adjustment, the component temperature can be made to be 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 can ensure the normal operation of the air conditioning system. For example, the value range of the second preset temperature is 78°C - 81°C, preferably 80°C, the value range of the third preset temperature is 72°C to 76°C, preferably 75°C, and the value of the first rate can be determined according to the system response speed, the change rate of the component temperature, etc. For example, the value of the first rate is 1P / min - 10P / min, or adjust 1% - 3% of the original opening per minute, etc. Of course, the above values are not restrictive, and their specific values can be adjusted according to actual applications.

[0110] In a possible specific implementation, when the component temperature > 80°C, the temperature of the drive board chip may be too high. The opening degree of the second throttle valve is controlled to decrease at a rate of 5P per minute to reduce the opening degree of the second throttle valve, lower the temperature of the refrigerant entering the refrigerant radiator, increase the temperature difference between the refrigerant radiator and the drive board chip, and lower the temperature of the drive board chip. When 75°C ≤ component temperature ≤ 80°C, the opening degree of the second throttle valve is maintained unchanged to keep the temperature of the drive board chip within a reasonable temperature range. When the component temperature < 75°C, the temperature of the drive board chip is relatively low, and the opening degree of the second throttle valve is controlled to increase at a rate of 5P per minute to increase the opening degree of the second throttle valve, increase the temperature of the refrigerant entering the refrigerant radiator, reduce the temperature difference between the refrigerant radiator and the drive board chip, and increase the temperature of the drive board chip. The above control method can adjust the component temperature to the preset temperature range.

[0111] The above control method, through the coordinated adjustment of the throttle valve and the on-off valve, while ensuring effective heat dissipation of the drive board chip by the refrigerant radiator, can also ensure the stable operation of the unit and maintain the best system state.

[0112] As a possible implementation, the control method of the present invention further includes: detecting the second temperature of the refrigerant flowing out through the first passage structure by a third temperature sensor, and obtaining the ambient temperature by an ambient temperature sensor. When the ambient temperature is less than the preset ambient temperature threshold, if the second temperature is greater than the sum of the ambient temperature and the preset positive adjustment value, the opening degree of the second throttle valve is controlled to decrease at the preset first rate. When the ambient temperature is greater than the preset ambient temperature threshold, if the second temperature is greater than the ambient temperature, the opening degree of the second throttle valve is controlled to decrease at the preset first rate. Among them, the ambient temperature threshold and the adjustment value can be determined through experiments or experience, etc. The value range of the ambient temperature threshold can be 28°C to 32°C, preferably 30°C. The value range of the adjustment value can be 3°C - 7°C, preferably 5°C. Of course, the above values are not restrictive, and their specific values can be adjusted according to actual applications.

[0113] As a possible specific implementation, when the ambient temperature < 30°C, if the second temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the heating mode) > ambient temperature + 5°C, the opening degree of the second throttle valve is controlled to decrease at the preset first rate. That is to say, when the ambient temperature < 30°C, if the second temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the heating mode) ≤ ambient temperature + 5°C, it is not allowed to reduce the opening degree of the second throttle valve. The occurrence of condensation is caused by the temperature of the refrigerant on the radiator surface being lower than the ambient temperature. Since condensation is likely to form when the ambient temperature is low, adding 5°C to the ambient temperature is to set a safety margin to ensure that the surface of the refrigerant radiator will not condense.

[0114] When the ambient temperature ≥ 30°C, if the second temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the heating mode) > the ambient temperature, the opening degree of the second throttle valve is controlled to decrease at a preset first rate. That is to say, when the ambient temperature ≥ 30°C, if the second temperature (representing the temperature at the refrigerant inlet of the refrigerant radiator in the heating mode) ≤ the ambient temperature, it is not allowed to close the opening degree of the second throttle valve. At high ambient temperatures, the risk of condensation on the surface of the refrigerant radiator is lower than that in low-temperature environments. Therefore, in this case, no adjustment value is added. When the second temperature > the ambient temperature, the opening degree of the second throttle valve can be controlled to decrease at a preset first rate.

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

[0116] Among them, step S206 and step S400 can be executed in parallel or in reverse. Among them, the magnitude of the real-time working parameter values can change with the change of the opening degree of the second throttle valve and / or the first throttle valve. The working parameter values can be the suction superheat degree, the pipe temperature of the second heat exchanger, the pipe temperature of the first heat exchanger, or the high-pressure pressure value, etc. Among them, the high-pressure pressure value is the pressure of the refrigerant at the exhaust port of the compressor, and can be monitored and obtained in real time by installing a pressure sensor on the refrigerant pipe connected to the exhaust port. The pipe 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 pipe 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 acquisition method of the suction superheat degree can be realized by using the existing technology. In one embodiment, the suction superheat degree is determined by the difference between the suction temperature and the saturation temperature of the suction-side pressure of the air-conditioning system. The suction temperature is detected by a temperature sensor arranged on the suction side of the compressor, and the saturation temperature of the suction-side pressure is obtained by calculating after detecting the suction-side pressure.

[0117] Step S400 refers to adjusting the opening degree of the first throttle valve so that the real-time working parameter values reach the preset target working parameter values. Taking the working parameter value as the suction superheat degree as an example for explanation, when the suction superheat degree is less than the target superheat degree, the opening degree of the first throttle valve is decreased to increase the suction superheat degree; when the suction superheat degree is greater than the target superheat degree, the opening degree of the first throttle valve is increased to decrease the suction superheat degree; when the suction superheat degree is equal to the target superheat degree, the opening degree of the first throttle valve is maintained unchanged. Thus, the air-conditioning system unit operates smoothly and maintains the best system state. The value of the above-mentioned target working parameter values can be adjusted according to the specific air-conditioning system design and application environment. For example, the value range of the target suction superheat degree can be between 0°C and 5°C, for example, it is 2°C.

[0118] As a possible implementation, when the component temperature is lower than the fourth preset temperature, the second heat dissipation program is exited. Among them, the third preset temperature is higher than the fourth preset temperature. The fourth preset temperature means that the temperature of the refrigerant radiator is already very low, and it is not necessary for all the refrigerant to enter the second throttle valve for throttling, so the second heat dissipation program is exited. The value range of the fourth preset temperature can be 62°C to 68°C, preferably 65°C. Of course, this is not restrictive, and its specific value can be adjusted according to actual applications. Further, when the component temperature is lower than the fourth preset temperature and lasts for the second preset time, the second heat dissipation program is exited. This can avoid 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, it can be 1 - 5 minutes, specifically 3 minutes. Of course, the above values are not restrictive, and its specific value can be adjusted according to actual applications.

[0119] As a possible implementation, after exiting the second heat dissipation program, control the second on-off valve to open, and control the opening degree of the second throttle valve to be fully opened. For example, the opening degree of the second throttle valve is increased to 480P to remove the throttling effect in front of the refrigerant radiator, no longer perform special heat dissipation control, and control the opening degree of the first throttle valve to decrease by the first preset opening degree so that the first throttle valve can quickly reach the optimal opening degree.

[0120] Further, after the step of controlling the opening degree of the first throttle valve to decrease by the first preset opening degree, the control method of the present invention further includes: obtaining the real-time working parameter value, and adjusting the opening degree of the first throttle valve based on the real-time working parameter value and the preset target working parameter value. The specific adjustment method refers to step S400 and will not be elaborated here.

[0121] Among them, in the heating mode, the refrigerant in the first passage structure of the economizer exchanges heat with the low-temperature refrigerant in the second passage structure, so as to further reduce the refrigerant temperature and ensure the effective operation of the refrigerant radiator.

[0122] In summary, the control method of the present invention can avoid the situation of overheating of the driver board chip whether the air-conditioning system is in the cooling mode or the heating mode, and solve the problems of compressor frequency limitation and insufficient capacity caused by insufficient heat dissipation of the driver board chip. While ensuring the heat dissipation of the refrigerant radiator, it can also ensure the stable operation of the air-conditioning system and maintain the best system state. In addition, when the air-conditioning system uses high-temperature refrigerant (such as R290), it can also effectively dissipate heat from the driver board chip, and the temperature of the refrigerant after condensation is at least below 70°C. In addition, the air-conditioning system and its control method of the present invention do not require air-cooled heat dissipation for the refrigerant radiator. Since air-cooling is not required, there is no problem of leakage, fire, and explosion due to the inability to completely seal the electric control box.

[0123] The following introduces a possible control method when the present invention executes the refrigeration mode. As Figure 3 shown, it includes the following steps:

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

[0125] Step S502: Determine whether Tf > 85°C and lasts for 2 minutes? If so, execute Step S503; if not, execute Step S501.

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

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

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

[0129] Step S506: Determine whether Tf > 80°C? If so, execute Step S507; if not, execute Step S512.

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

[0131] Step S508: Determine whether Tao > 30°C? If so, execute Step S509; if not, execute Step S510.

[0132] Step S509: Determine whether Trc > Tao? If so, execute Step S511; if not, execute Step S507.

[0133] Step S510: Determine whether Trc > Tao + 5? If so, execute Step S511; if not, execute Step S507.

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

[0135] Step S512: Determine whether Tf < 75°C? If so, execute Step S514; if not, execute Step S513.

[0136] Step S513: Control the opening of the first throttle valve to remain unchanged.

[0137] Step S514: Determine whether Tf < 65°C and lasts for 3 minutes? If so, execute Step S516; if not, execute Step S515.

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

[0139] Step S516: Control the first on-off valve to open, control the opening degree of the first throttle valve to be fully open, and control the opening degree of the second throttle valve to be reduced by 100P.

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

[0141] A possible control method when the present invention executes the heating mode will be introduced below. As Figure 4 shown, it includes the following steps:

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

[0143] Step S602: Determine whether Tf > 85°C and lasts for 2 minutes? If so, execute Step S603; if not, execute Step S601.

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

[0145] Step S604: Control the opening degree of the first throttle valve to increase by 100P.

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

[0147] Step S606: Determine whether Tf > 80°C? If so, execute Step S607; if not, execute Step S612.

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

[0149] Step S608: Determine whether Tao > 30°C? If so, execute Step S609; if not, execute Step S610.

[0150] Step S609: Determine whether Trh > Tao? If so, execute Step S611; if not, execute Step S607.

[0151] Step S610: Determine whether Trh > Tao + 5? If so, execute Step S611; if not, execute Step S607.

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

[0153] Step S612: Determine whether Tf < 75°C? If so, execute Step S614; if not, execute Step S613.

[0154] Step S613: Control the opening degree of the second throttle valve to remain unchanged.

[0155] Step S614: Determine whether Tf < 65°C and lasts for 3 minutes? If so, execute Step S616; if not, execute Step S615.

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

[0157] Step S616: Control the second on-off valve to open, control the opening degree of the second throttle valve to be fully open, and control the opening degree of the first throttle valve to decrease by 100P.

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

[0159] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that, The air conditioning system includes: A compressor, a first heat exchanger, a first throttle valve, a refrigerant radiator, a second throttle valve, and a second heat exchanger that are connected in sequence to form a loop; 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 component.

2. The air conditioning system according to claim 1, wherein 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, 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.

3. The air conditioning system according to claim 1 or 2, wherein The compressor includes a gas supplement port; The air conditioning system further 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 throttle valve through its two ends respectively. One end of the second passage structure is connected to the gas supplement port, 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 arranged on the branch pipe.

4. The air conditioning system according to claim 3, wherein The air conditioning system further 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, wherein 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 of 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 of 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: A compressor, a first heat exchanger, a first throttle valve, a refrigerant radiator, a second throttle valve, and a second heat exchanger that are connected in sequence to form a loop; 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 component; A first temperature sensor, which is used to detect the component temperature of the heat dissipation component; The control method includes: Obtaining the component temperature; Based on the component temperature, controlling the opening and closing of the first on-off valve, and adjusting the opening degrees of the first throttle valve and the second throttle valve.

7. The control method of the air conditioning system according to claim 6, wherein The step of "based on the component temperature, controlling the opening and closing of the first on-off valve, and adjusting the opening degrees of the first throttle valve and the second throttle valve" further includes: When the temperature of the component is greater than the first preset temperature, execute the first heat dissipation program; The first heat dissipation program is as follows: Control the first on-off valve to close; Control the opening degree of the second throttle valve to increase by a first preset opening degree; Based on the temperature of the component, adjust the opening degree of the first throttle valve so that the temperature of the component is within a preset temperature range.

8. The control method of the air conditioning system according to claim 7, wherein The step of "Based on the temperature of the component, adjust the opening degree of the first throttle valve so that the temperature of the component is within a preset temperature range" further includes: When the temperature of the component is greater than the second preset temperature, control the opening degree of the first throttle valve 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, control the opening degree of the first throttle valve to remain unchanged; When the temperature of the component is less than the third preset temperature, control the opening degree 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.

9. The control method of the air conditioning system according to claim 8, wherein 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 of the first throttle 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; When the ambient temperature is less than a preset ambient temperature threshold, if the first temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then control the opening degree of the first throttle valve to decrease at a preset first rate; and / or When the ambient temperature is greater than a preset ambient temperature threshold, if the first temperature is greater than the ambient temperature, then control the opening degree of the first throttle valve to decrease at a preset first rate.

10. The control method of the air conditioning system according to claim 8, wherein The control method further includes: When the temperature of the component is less than the fourth preset temperature, exit the first heat dissipation program; Wherein, the third preset temperature is greater than the fourth preset temperature.

11. The control method of the air conditioning system according to claim 10, wherein The control method further includes: After exiting the first heat dissipation program, control the first on-off valve to open, control the opening degree of the first throttle valve to be fully open, and control the opening degree of the second throttle valve to decrease by the first preset opening degree.

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

13. The control method of the air-conditioning system according to claim 7, wherein: The air-conditioning system further comprises: A second on-off valve, which is connected in parallel with the second throttle valve; A four-way reversing valve, through which the compressor is connected to the first heat exchanger and the second heat exchanger. 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 comprises: Only when the inlet is connected to the first port and the second port is connected to the outlet, the first heat dissipation program is executed.

14. The control method of the air-conditioning system according to claim 13, wherein: Before the step of "controlling the opening degree of the second throttle valve to increase by a first preset opening degree", the control method further comprises: Controlling the second on-off valve to close.

15. The control method of the air-conditioning system according to claim 13 or 14, wherein: The control method further comprises: When the inlet is connected to the second port and the first port is connected to the outlet, if the component temperature is greater than the first preset temperature, execute the second heat dissipation program; The second heat dissipation program is: Controlling the first on-off valve and the second on-off valve to close; Controlling the opening degree of the first throttle valve to increase by a first preset opening degree; Based on the component temperature, adjusting the opening degree of the second throttle valve so that the component temperature is within a preset temperature range.

16. The control method of the air-conditioning system according to claim 15, wherein: The step of "based on the component temperature, adjusting the opening degree of the second throttle valve so that the component temperature is within a preset temperature range" further comprises: When the component temperature is greater than the second preset temperature, controlling the opening degree 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 the third preset temperature, controlling the opening degree of the second throttle valve to remain unchanged; When the component temperature is less than the third preset temperature, controlling the opening degree 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.

17. The control method of the air-conditioning system according to claim 16, wherein: The compressor includes a gas supplement port; The air-conditioning system further comprises an economizer and a throttling element. The economizer includes a first passage structure and a second passage structure capable of heat exchange with each other. The first passage structure is connected to the refrigerant radiator and the second throttle valve through its two ends respectively. One end of the second passage structure is connected to the gas supplement port. 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 arranged on the branch pipe; The air conditioning system further 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: Obtaining the second temperature and the ambient temperature; When the ambient temperature is less than a preset ambient temperature threshold, if the second temperature is greater than the sum of the ambient temperature and a preset positive adjustment value, then control the opening degree of the second throttle valve to decrease at a preset first rate; and / or When the ambient temperature is greater than a preset ambient temperature threshold, if the second temperature is greater than the ambient temperature, then control the opening degree of the second throttle valve to decrease at a preset first rate.

18. The control method of the air conditioning system according to claim 16, wherein The control method further includes: When the component temperature is less than a fourth preset temperature, exit the second heat dissipation program; Wherein, the third preset temperature is greater than the fourth preset temperature.

19. The control method of the air conditioning system according to claim 18, wherein After exiting the second heat dissipation program, control the second on-off valve to open, control the opening degree of the second throttle valve to be fully open, and control the opening degree of the first throttle valve to decrease by the first preset opening degree.

20. The control method of the air conditioning system according to claim 19, wherein After the step of "controlling the opening degree of the first throttle valve to increase by the first preset opening degree", and / or after the step of "controlling the opening degree of the first throttle valve to decrease by the first preset opening degree", the control method further includes: Obtaining the real-time working parameter value; Based on the real-time working parameter value and a preset target working parameter value, adjusting the opening degree of the first throttle valve; The magnitude of the real-time working parameter value can change with the change of the throttle valve opening degree.

21. The control method of the air conditioning system according to claim 12 or 20, wherein The working parameter value is the suction superheat degree, the pipe temperature of the first heat exchanger, the pipe temperature of the second heat exchanger or the high-pressure pressure value.

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