Air conditioning system and control method and device of air conditioning system

Abstract

The invention relates to an air conditioning system and a control method and device of the air conditioning system, and the air conditioning system comprises a refrigerant circulation loop and a refrigerant flow path; the input end of the refrigerant flow path communicates with a liquid pipe of a shell and tube heat exchanger in the refrigerant circulation loop, the output end of the refrigerant flow path communicates with a liquid inlet hole of a gas-liquid separator in the refrigerant circulation loop, and a first electromagnetic valve is arranged on the refrigerant flow path; and when the first electromagnetic valve is opened, the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path. According to the embodiment, the temperature of the refrigerant in the vapor-liquid separator can be increased, vaporization of the refrigerant is promoted, disturbance is generated in the vapor-liquid separator, the viscosity of oil is reduced, fusion of the oil and the refrigerant is improved, oil return of the compressor is easier, the oil return reliability of an air conditioner system is guaranteed, the refrigerant is subjected to heat exchange and supercooling in the vapor-liquid separator, the supercooling degree is increased, and the service life of the compressor is prolonged. It can be guaranteed that the refrigerant is still a liquid refrigerant after passing through the IPM heat dissipation module, the throttling effect is guaranteed, and the heat exchange amount can also be increased.

Description

Technical Field

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

[0003] Currently, most ordinary air-cooled air-source heat pumps are limited to a minimum ambient temperature of -15°C during heating operation. By adjusting the compressor frequency through variable frequency technology, the operating temperature range of the compressor can be significantly broadened. For example, the operating temperature range of the equipment can be extended to -20°C to -25°C, and some heating models can even be as low as -35°C. As the minimum operating ambient temperature decreases, when the equipment operates under low-temperature conditions, the temperatures of the lubricating oil and refrigerant also drop significantly, which will cause a significant increase in the viscosity of the lubricating oil, a significant deterioration in fluidity, and a decrease in the solubility between the lubricating oil and the refrigerant.

[0004] In the operating mechanism of an integrated air conditioner unit, the flow of the refrigerant drives the circulation of the lubricating oil in the system. However, when the viscosity of the lubricating oil increases significantly due to factors such as low temperature, the lubricating oil discharged from the compressor is difficult to flow smoothly back into the compressor. More seriously, due to the decrease in the solubility between the lubricating oil and the refrigerant, the two will stratify in the gas-liquid separator (gas-liquid separator), which will cause the oil return process of the unit to be blocked, resulting in insufficient lubrication and cooling of the compressor. Long-term operation is likely to cause wear of the compressor, affecting the normal operation and service life of the unit. Summary of the Invention

[0005] In order to solve the technical problem that the oil return process of the above-mentioned unit is blocked, resulting in insufficient lubrication and cooling of the compressor, and long-term operation is likely to cause wear of the compressor, affecting the normal operation and service life of the unit, or at least partially solve the above technical problem, the present application provides an air conditioning system, a control method and device for the air conditioning system.

[0006] In a first aspect, the present application provides an air conditioning system, including: a refrigerant circulation circuit and a refrigerant flow path;

[0007] The input end of the refrigerant flow path is connected to the liquid pipe of the shell-and-tube heat exchanger in the refrigerant circulation circuit, the output end of the refrigerant flow path is connected to the liquid inlet hole of the gas-liquid separator in the refrigerant circulation circuit, and a first solenoid valve is provided on the refrigerant flow path;

[0008] When the first solenoid valve is opened, high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0009] In a second aspect, the present application provides a control method for an air conditioning system, including:

[0010] Obtaining the current operating mode of the air conditioning system as described in the first aspect;

[0011] Obtain the ambient temperature of the environment where the air conditioning system is located;

[0012] When the current operating mode is the heating operating mode, determine whether the ambient temperature is less than or equal to a first temperature threshold;

[0013] If the ambient temperature is less than or equal to the first temperature threshold, control the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0014] Optionally, the method further includes:

[0015] When the current operating mode is the cooling operating mode, determine whether the ambient temperature is greater than a second temperature threshold;

[0016] If the ambient temperature is less than or equal to the second temperature threshold, control the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0017] Optionally, the method further includes:

[0018] When the current operating mode is the heating operating mode, if the ambient temperature is greater than the first temperature threshold, or when the current operating mode is the cooling operating mode, if the ambient temperature is greater than the second temperature threshold, control the first solenoid valve to close.

[0019] In a third aspect, the present application provides an air conditioning system, including: a refrigerant circulation loop, a refrigerant flow path, and a refrigerant circuit;

[0020] The input end of the refrigerant flow path is communicated with the liquid pipe of the shell-and-tube heat exchanger in the refrigerant circulation loop, the output end of the refrigerant flow path is communicated with the liquid inlet hole of the gas-liquid separator in the refrigerant circulation loop, and a first solenoid valve is arranged on the refrigerant flow path;

[0021] The input end of the refrigerant circuit is communicated with the liquid outlet of the gas-liquid separator in the refrigerant circulation loop, the output end of the refrigerant circuit is communicated with the liquid pipe of the shell-and-tube heat exchanger in the refrigerant circulation loop, and a second solenoid valve is arranged on the refrigerant circuit;

[0022] When the first solenoid valve is opened, the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; when the second solenoid valve is opened, the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0023] In a fourth aspect, the present application provides a control method for an air conditioning system, which includes:

[0024] Obtain the current operating mode of the air-conditioning system as described in the third aspect;

[0025] Obtain the ambient temperature of the environment where the air-conditioning system is located;

[0026] When the current operating mode is the heating operating mode, determine whether the ambient temperature is less than or equal to the first temperature threshold;

[0027] If the ambient temperature is less than or equal to the first temperature threshold, control the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, control the second solenoid valve to open so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0028] Optionally, the method further includes:

[0029] When the current operating mode is the cooling operating mode, determine whether the ambient temperature is greater than the second temperature threshold;

[0030] If the ambient temperature is less than or equal to the second temperature threshold, control the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, control the second solenoid valve to open so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0031] Optionally, the method further includes:

[0032] When the current operating mode is the heating operating mode, if the ambient temperature is greater than the first temperature threshold, or when the current operating mode is the cooling operating mode, if the ambient temperature is greater than the second temperature threshold, control the first solenoid valve and the second solenoid valve to close.

[0033] In a fifth aspect, the present application provides a control device for an air-conditioning system, including:

[0034] A first acquisition module for acquiring the current operating mode of the air-conditioning system as described in the first aspect;

[0035] A second acquisition module for acquiring the ambient temperature of the environment where the air-conditioning system is located;

[0036] A first determination module for determining whether the ambient temperature is less than or equal to the first temperature threshold when the current operating mode is the heating operating mode;

[0037] A first control module for controlling the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path if the ambient temperature is less than or equal to the first temperature threshold.

[0038] Optionally, the device further includes:

[0039] A third determination module, configured to determine whether the ambient temperature is greater than a second temperature threshold when the current operating mode is a refrigeration operating mode;

[0040] A third control module, configured to control the first solenoid valve to open if the ambient temperature is less than or equal to the second temperature threshold, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0041] Optionally, the device further includes:

[0042] A fourth control module, configured to control the first solenoid valve to close when the current operating mode is a heating operating mode if the ambient temperature is greater than a first temperature threshold, or when the current operating mode is a refrigeration operating mode if the ambient temperature is greater than the second temperature threshold.

[0043] In a sixth aspect, the present application provides a control device for an air-conditioning system, including:

[0044] A third acquisition module, configured to acquire the current operating mode of the air-conditioning system described in the third aspect;

[0045] A fourth acquisition module, configured to acquire the ambient temperature of the environment where the air-conditioning system is located;

[0046] A second determination module, configured to determine whether the ambient temperature is less than or equal to the first temperature threshold when the current operating mode is a heating operating mode;

[0047] A second control module, configured to control the first solenoid valve to open if the ambient temperature is less than or equal to the first temperature threshold, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; and while controlling the first solenoid valve to open, control the second solenoid valve to open, so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0048] Optionally, the device further includes:

[0049] A fourth determination module, configured to determine whether the ambient temperature is greater than the second temperature threshold when the current operating mode is a refrigeration operating mode;

[0050] The fifth control module is configured to control the opening of the first solenoid valve if the ambient temperature is less than or equal to the second temperature threshold, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the opening of the first solenoid valve, control the opening of the second solenoid valve, so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0051] Optionally, the device further includes:

[0052] The sixth control module is configured to control the closing of the first solenoid valve and the second solenoid valve if the ambient temperature is greater than the first temperature threshold when the current operating mode is the heating operating mode, or if the ambient temperature is greater than the second temperature threshold when the current operating mode is the cooling operating mode.

[0053] In a seventh aspect, the present application provides an air-conditioning system, including a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete communication with each other through the communication bus;

[0054] The memory is used to store a computer program;

[0055] The processor is configured to, when executing the program stored on the memory, implement the control method of the air-conditioning system according to any one of the second aspects, or the control method of the air-conditioning system according to any one of the fourth aspects.

[0056] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0057] In the embodiments of the present application, the high-temperature refrigerant from the shell-and-tube heat exchanger is used to exchange heat inside the gas-liquid separator, so as to increase the refrigerant temperature in the gas-liquid separator, promote the vaporization of the refrigerant, generate disturbances in the gas-liquid separator, reduce the viscosity of the oil, increase the fusion of the oil and the refrigerant, so that the compressor oil return is easier, ensuring the oil return reliability of the air-conditioning system. Moreover, this part of the refrigerant is subcooled through the internal heat exchange of the gas-liquid separator, increasing the subcooling degree, which can ensure that the refrigerant is still in a liquid state after passing through the IPM heat dissipation module, ensuring the throttling effect and increasing the heat exchange capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0060] Figure 1 A structural diagram of an air - conditioning system provided by an embodiment of the present application;

[0061] Figure 2 Another structural diagram of an air - conditioning system provided by an embodiment of the present application;

[0062] Figure 3 Another structural diagram of an air - conditioning system provided by an embodiment of the present application;

[0063] Figure 4 A flowchart of a control method for an air - conditioning system provided by an embodiment of the present application;

[0064] Figure 5 A structural diagram of a control device for an air - conditioning system provided by an embodiment of the present application;

[0065] Figure 6 Another structural diagram of an air - conditioning system provided by an embodiment of the present application.

[0066] Among them, 1. Compressor, 2. Four - way valve, 3. Finned heat exchanger, 4. Heating electronic expansion valve, 5. First filter, 6. Shell - and - tube heat exchanger, 7. Gas - liquid separator, 8. First solenoid valve, 9. Second solenoid valve, 10. IPM heat dissipation module, 11. Refrigeration electronic expansion valve, 12. Second filter. Detailed implementation manners

[0067] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0068] In the operation mechanism of an integrated air - conditioning unit, the flow of refrigerant drives the circulation of lubricating oil in the system. When the viscosity of the lubricating oil significantly increases due to low temperature and other factors, the lubricating oil discharged from the compressor is difficult to smoothly flow back into the compressor. More seriously, due to the reduced solubility of the lubricating oil and the refrigerant, the two will show a layering phenomenon in the gas - liquid separator (gas - liquid separator). This situation will lead to the blockage of the oil return process of the unit, resulting in insufficient lubrication and cooling of the compressor. Long - term operation is likely to cause wear of the compressor, affecting the normal operation and service life of the unit. For this reason, the embodiments of the present application provide an air - conditioning system, a control method, and a device for the air - conditioning system.

[0069] An embodiment of the present application provides an air-conditioning system. Exemplarily, the air-conditioning system may be an air-source heat pump air-conditioning system, such as Figure 1 As shown, the air-conditioning system includes: a refrigerant circulation circuit and a refrigerant flow path; wherein, the refrigerant circulation circuit includes: a compressor 1, a four-way valve 2, a fin heat exchanger 3, a heating electronic expansion valve 4, a first filter 5, a shell-and-tube heat exchanger 6, a gas-liquid separator 7, an IPM heat dissipation module 10, a refrigeration electronic expansion valve 11, a second filter 12, etc.;

[0070] In the refrigeration cycle and the heating cycle, the flow direction of the refrigerant in the refrigerant circulation circuit is different, specifically as follows:

[0071] Refrigeration cycle: The high-pressure discharge end of the compressor discharges high-temperature and high-pressure gas, which enters the finned air-side heat exchanger after being reversed by the four-way valve. At this time, the finned air-side heat exchanger serves as a condenser to condense the high-temperature and high-pressure gas into a liquid. After being filtered by the filter, it enters the expansion valve, and after expanding and reducing the pressure, it enters the shell-and-tube water-side heat exchanger. The low-temperature and low-pressure saturated refrigerant absorbs the heat of the chilled water to reduce the temperature of the chilled water. The refrigerant outlet state of the shell-and-tube water-side heat exchanger is low-temperature and low-pressure gaseous, and then it enters the gas-liquid separator for gas-liquid separation, and the gas returns to the low-pressure suction end of the compressor for compression. Its flow direction is: high-pressure discharge end of the compressor → four-way valve → finned air-side heat exchanger → check valve → accumulator → filter → expansion valve → shell-and-tube water-side heat exchanger → four-way valve → gas-liquid separator → low-pressure suction end of the compressor.

[0072] Heating cycle: The high-temperature and high-pressure gas discharged from the high-pressure discharge end of the compressor enters the shell-and-tube water-side heat exchanger after being reversed by the four-way valve. At this time, the shell-and-tube water-side heat exchanger serves as a condenser to condense the high-temperature and high-pressure gas into a liquid. After being filtered by the filter, it enters the expansion valve, and after the refrigerant expands and reduces the pressure, it enters the finned air-side heat exchanger. At this time, the finned air-side heat exchanger serves as an evaporator to absorb heat from the air. The refrigerant outlet state of the air-side heat exchanger is low-temperature and low-pressure gaseous, and then it enters the gas-liquid separator for gas-liquid separation and returns to the low-pressure suction end of the compressor for compression. Its flow direction is: high-pressure discharge end of the compressor → four-way valve → shell-and-tube water-side heat exchanger → check valve → accumulator → filter → expansion valve → finned air-side heat exchanger → four-way valve → gas-liquid separator → low-pressure suction end of the compressor.

[0073] The input end of the refrigerant flow path is communicated with the liquid pipe of the shell-and-tube heat exchanger in the refrigerant circulation circuit, the output end of the refrigerant flow path is communicated with the liquid inlet hole of the gas-liquid separator in the refrigerant circulation circuit, and a first solenoid valve 8 is arranged on the refrigerant flow path;

[0074] When the first solenoid valve 8 is opened, the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path, and by taking liquid from the high-pressure liquid pipe and inputting it into the gas-liquid separator, the refrigerant in the gas-liquid separator is heated.

[0075] In an embodiment of the present application, a flow path is branched from the liquid pipe of the system water-side heat exchanger and passes through the bottom of the gas-liquid separator, and a first solenoid valve is added to this refrigerant flow path to control the on / off of this flow path, as shown in the attached Figure 1 figure.

[0076] In an embodiment of the present application, the high-temperature refrigerant from the shell-and-tube heat exchanger is used to exchange heat inside the gas-liquid separator, increasing the refrigerant temperature in the gas-liquid separator, promoting refrigerant vaporization, generating perturbations in the gas-liquid separator, reducing the viscosity of the oil, increasing the fusion of the oil and the refrigerant, thus making it easier for the compressor to return oil, ensuring the oil return reliability of the air-conditioning system. Moreover, this part of the refrigerant is subcooled after heat exchange inside the gas-liquid separator, increasing the subcooling degree, which can ensure that the refrigerant remains in a liquid state after passing through the IPM heat dissipation module, ensuring the throttling effect and also increasing the heat exchange capacity.

[0077] In addition, in an embodiment of the present application, only the refrigerant flow path is added, and a part of the high-temperature refrigerant is simply sprayed into the gas-liquid separator through the refrigerant flow path to heat the refrigerant and the oil temperature in the gas-liquid separator, reducing the pipelines coming out of the gas-liquid separator and the circulating pipelines in the gas-liquid separator, reducing costs, and the pipelines are simple.

[0078] In another embodiment of the present application, as Figure 2 shown, an embodiment of the present application also provides an air-conditioning system, including: a refrigerant circulation circuit, a refrigerant flow path, and a refrigerant circuit;

[0079] The input end of the refrigerant flow path is communicated with the liquid pipe of the shell-and-tube heat exchanger in the refrigerant circulation circuit, the output end of the refrigerant flow path is communicated with the liquid inlet hole of the gas-liquid separator in the refrigerant circulation circuit, and a first solenoid valve is arranged on the refrigerant flow path;

[0080] The input end of the refrigerant circuit is communicated with the liquid outlet of the gas-liquid separator in the refrigerant circulation circuit, the output end of the refrigerant circuit is communicated with the liquid pipe of the shell-and-tube heat exchanger in the refrigerant circulation circuit, and a second solenoid valve is arranged on the refrigerant circuit;

[0081] When the first solenoid valve is opened, the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; when the second solenoid valve is opened, the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0082] In an embodiment of the present application, a flow path is branched from the liquid pipe of the system water-side heat exchanger, passes through the bottom of the gas-liquid separator, and then returns to the liquid pipe of the shell-and-tube heat exchanger, and a first solenoid valve is added to this refrigerant flow path, and a second solenoid valve is added to the refrigerant circuit to control the on / off cycle of this flow path, as shown in the attached Figure 2 figure.

[0083] As Figure 3As shown, the input end of the refrigerant flow path and the output end of the refrigerant circuit can also be connected to the pipeline between the IPM heat dissipation module and the refrigeration electronic expansion valve according to actual needs.

[0084] In the embodiment of the present application, a circulation loop is formed through the refrigerant flow path and the refrigerant circuit, so that the refrigerant exchanges heat inside the gas-liquid separator through the circulation loop, exchanges heat with the refrigerant in the gas-liquid separator, increases the temperature of the refrigerant in the gas-liquid separator, promotes the vaporization of the refrigerant, causes perturbations in the gas-liquid separator, reduces the viscosity of the oil, increases the fusion of the oil and the refrigerant, thereby making it easier for the compressor to return oil, ensuring the oil return reliability of the air conditioning system. Moreover, the refrigerant in this part is subcooled through heat exchange inside the gas-liquid separator, increasing the subcooling degree, which can ensure that the refrigerant is still in a liquid state after passing through the IPM heat dissipation module, ensuring the throttling effect and also increasing the heat exchange amount.

[0085] In another embodiment of the present application, a control method for the air conditioning system only including the refrigerant flow path described above is also provided, as Figure 4 shown, including:

[0086] Step S101, obtaining the current operating mode of the air conditioning system;

[0087] In the embodiment of the present application, the current operating mode of the air conditioning system can be a heating operating mode or a cooling operating mode.

[0088] Step S102, obtaining the ambient temperature of the environment where the air conditioning system is located;

[0089] In the embodiment of the present application, the ambient temperature can refer to the outdoor ambient temperature.

[0090] Step S103, when the current operating mode is the heating operating mode, determining whether the ambient temperature is less than or equal to the first temperature threshold;

[0091] In the embodiment of the present application, the first temperature threshold can be set in advance according to actual needs. Exemplarily, the first temperature threshold can be 0°C.

[0092] Step S104, if the ambient temperature is less than or equal to the first temperature threshold, controlling the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0093] In the embodiment of the present application, when the ambient temperature is lower than 0°C, during the heating operation, the gas-liquid separator is on the low-pressure side, and the temperature of the refrigerant and oil inside is low. After being cooled by the shell-and-tube heat exchanger, the refrigerant is still a high-temperature liquid refrigerant. The first solenoid valve leading to the flow path of the gas-liquid separator is opened so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path. The high-temperature refrigerant from the shell-and-tube heat exchanger exchanges heat inside the gas-liquid separator, which can increase the temperature of the refrigerant in the gas-liquid separator, vaporize the refrigerant, cause disturbances in the gas-liquid separator, reduce the viscosity of the oil, increase the fusion of the oil and the refrigerant, and thus improve the oil return. This part of the refrigerant is subcooled by internal heat exchange in the gas-liquid separator, increasing the subcooling degree (because the refrigerant in the gas-liquid separator is cold, and the external circulating refrigerant will be cooled again by the refrigerant in the gas-liquid separator after passing through the gas-liquid separator, increasing the subcooling degree). It can ensure that the refrigerant is still in a liquid state after passing through the IPM heat dissipation module, ensure the throttling effect, and also increase the heat exchange capacity.

[0094] In the embodiment of the present application, the high-temperature refrigerant from the shell-and-tube heat exchanger is used to exchange heat inside the vapor-liquid separator, increasing the temperature of the refrigerant in the vapor-liquid separator, promoting the vaporization of the refrigerant, causing disturbances in the vapor-liquid separator, reducing the viscosity of the oil, increasing the fusion of the oil and the refrigerant, making it easier for the compressor to return oil, ensuring the reliability of oil return in the air-conditioning system. Moreover, this part of the refrigerant is subcooled by internal heat exchange in the vapor-liquid separator, increasing the subcooling degree, which can ensure that the refrigerant is still in a liquid state after passing through the IPM heat dissipation module, ensure the throttling effect, and also increase the heat exchange capacity.

[0095] In another embodiment of the present application, the method further includes:

[0096] Step S201, when the current operating mode is the refrigeration operating mode, determine whether the ambient temperature is greater than the second temperature threshold;

[0097] In the embodiment of the present application, the second temperature threshold can be preset according to actual needs. Exemplarily, the second temperature threshold can be 10°C.

[0098] Step S202, if the ambient temperature is less than or equal to the second temperature threshold, control the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0099] In the embodiment of the present application, when operating in low ambient temperature refrigeration, such as when the ambient temperature is lower than 10°C, through the bypass flow path, the oil circuit temperature of the gas-liquid separator can be increased, and the refrigerant temperature at the compressor suction port can be raised, which can not only avoid liquid carry-over but also reduce the compressor load.

[0100] In the embodiment of the present application, the high-temperature refrigerant from the IPM heat dissipation module is used to exchange heat inside the gas-liquid separator, increasing the refrigerant temperature in the gas-liquid separator, promoting refrigerant vaporization, generating disturbances in the gas-liquid separator, reducing the viscosity of the oil, increasing the fusion of the oil and the refrigerant, thereby making it easier for the compressor to return oil, ensuring the oil return reliability of the air-conditioning system. Moreover, this part of the refrigerant is subcooled through heat exchange inside the gas-liquid separator, increasing the subcooling degree, which can ensure that the refrigerant remains in a liquid state after passing through the IPM heat dissipation module, ensuring the throttling effect and also increasing the heat exchange amount.

[0101] In another embodiment of the present application, the method further includes:

[0102] When the current operating mode is the heating operating mode, if the ambient temperature is greater than the first temperature threshold, or when the current operating mode is the cooling operating mode, if the ambient temperature is greater than the second temperature threshold, in step S301, control the first solenoid valve to close.

[0103] In the embodiment of the present application, when heating, after the ambient temperature is higher than 0°C and the system evaporation temperature is high, the refrigerant circulation volume is large, and the liquid level and oil level in the gas-liquid separator are low, meeting the system operation requirements. At this time, the first solenoid valve is not opened; when cooling, due to the high ambient temperature and water temperature, such as when the ambient temperature is lower than 10°C, the refrigerant circulation flow rate in the system is large, the liquid level in the gas-liquid separator is low, and the fusion of the oil and the refrigerant is good, and it operates normally without opening the first solenoid valve.

[0104] In another embodiment of the present application, a control method for an air-conditioning system including the aforementioned refrigerant flow path and refrigerant circuit is further provided. The method further includes:

[0105] Step S401, obtain the current operating mode of the air-conditioning system;

[0106] Step S402, obtain the ambient temperature of the environment where the air-conditioning system is located;

[0107] Step S403, when the current operating mode is the heating operating mode, determine whether the ambient temperature is less than or equal to the first temperature threshold;

[0108] Step S404, if the ambient temperature is less than or equal to the first temperature threshold, control the first solenoid valve to open, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, control the second solenoid valve to open, so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0109] In the embodiment of the present application, when the ambient temperature is lower than 0°C, during the heating operation, the gas-liquid separator is on the low-pressure side, and the temperature of the refrigerant and oil inside is low. After being cooled by the shell-and-tube heat exchanger, the refrigerant is still a high-temperature liquid refrigerant. The first solenoid valve of the refrigerant flow path and the second solenoid valve of the refrigerant circuit are opened so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path and then returns to the liquid pipe of the heat exchanger. The high-temperature refrigerant from the shell-and-tube heat exchanger exchanges heat inside the gas-liquid separator, which can increase the temperature of the refrigerant in the gas-liquid separator, vaporize the refrigerant, cause disturbances in the gas-liquid separator, reduce the viscosity of the oil, increase the fusion of the oil and the refrigerant, and thus improve the oil return. The refrigerant in this part is subcooled through internal heat exchange in the gas-liquid separator, increasing the subcooling degree (because the refrigerant in the gas-liquid separator is cold, and the external circulating refrigerant will be cooled again by the refrigerant in the gas-liquid separator after passing through the gas-liquid separator, increasing the subcooling degree). It can ensure that the refrigerant is still in a liquid state after passing through the IPM heat dissipation module, ensure the throttling effect, and also increase the heat exchange capacity.

[0110] In the embodiment of the present application, the refrigerant is passed through a circulation loop formed by the refrigerant flow path and the refrigerant circuit to exchange heat inside the vapor-liquid separator, exchange heat with the refrigerant in the gas-liquid separator, increase the temperature of the refrigerant in the gas-liquid separator, promote the vaporization of the refrigerant, cause disturbances in the gas-liquid separator, reduce the viscosity of the oil, increase the fusion of the oil and the refrigerant, so that the compressor oil return is easier, ensuring the oil return reliability of the air-conditioning system. Moreover, the refrigerant in this part is subcooled through internal heat exchange in the gas-liquid separator, increasing the subcooling degree, which can ensure that the refrigerant is still in a liquid state after passing through the IPM heat dissipation module, ensure the throttling effect, and also increase the heat exchange capacity.

[0111] In another embodiment of the present application, the method further includes:

[0112] Step S501, when the current operating mode is the refrigeration operating mode, determine whether the ambient temperature is greater than the second temperature threshold;

[0113] Step S502, if the ambient temperature is less than or equal to the second temperature threshold, control the first solenoid valve to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, control the second solenoid valve to open so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0114] In the embodiment of the present application, when operating in low ambient temperature refrigeration, such as when the ambient temperature is lower than 10°C, by controlling the opening of the refrigerant flow path and the refrigerant circuit through bypass, the oil path temperature of the gas-liquid separator can be increased, and the refrigerant temperature at the compressor suction port can be increased, which can both avoid liquid carry and reduce the compressor load.

[0115] In another embodiment of the present application, for an air-conditioning system that simultaneously includes a refrigerant flow path and a refrigerant circuit, the method further includes:

[0116] When the current operating mode is the heating operating mode, if the ambient temperature is greater than the first temperature threshold, or when the current operating mode is the cooling operating mode, if the ambient temperature is greater than the second temperature threshold, in step S601, control the first solenoid valve and the second solenoid valve to close.

[0117] In the embodiment of the present application, when heating, after the ambient temperature is higher than 0°C and the evaporation temperature of the system is high, the refrigerant circulation volume is large, and the liquid level and oil level in the gas-liquid separator are low to meet the system operation. At this time, the first solenoid valve and the second solenoid valve are not opened; when cooling, due to the high ambient temperature and water temperature, such as when the ambient temperature is lower than 10°C, the refrigerant circulation flow rate of the system is large, the liquid level in the gas-liquid separator is low, and the fusion of oil and refrigerant is good, and it operates normally without opening the first solenoid valve and the second solenoid valve.

[0118] In another embodiment of the present application, a control device for an air-conditioning system is further provided, as Figure 5 shown, including:

[0119] A first acquisition module 11, configured to acquire the current operating mode of the air-conditioning system;

[0120] A second acquisition module 12, configured to acquire the ambient temperature of the environment where the air-conditioning system is located;

[0121] A first determination module 13, configured to determine whether the ambient temperature is less than or equal to the first temperature threshold when the current operating mode is the heating operating mode;

[0122] A first control module 14, configured to control the first solenoid valve to open if the ambient temperature is less than or equal to the first temperature threshold, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0123] Optionally, the device further includes:

[0124] A third determination module, configured to determine whether the ambient temperature is greater than the second temperature threshold when the current operating mode is the cooling operating mode;

[0125] A third control module, configured to control the first solenoid valve to open if the ambient temperature is less than or equal to the second temperature threshold, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

[0126] Optionally, the device further includes:

[0127] A fourth control module, configured to control the first solenoid valve to close when the current operating mode is the heating operating mode and the ambient temperature is greater than the first temperature threshold, or when the current operating mode is the cooling operating mode and the ambient temperature is greater than the second temperature threshold.

[0128] In another embodiment of the present application, a control device for an air-conditioning system is further provided, including:

[0129] A third acquisition module 21, configured to acquire the current operating mode of the air-conditioning system;

[0130] A fourth acquisition module 22, configured to acquire the ambient temperature of the environment where the air-conditioning system is located;

[0131] A second determination module 23, configured to determine whether the ambient temperature is less than or equal to a first temperature threshold when the current operating mode is a heating operating mode;

[0132] A second control module 24, configured to, if the ambient temperature is less than or equal to the first temperature threshold, control the first solenoid valve to open, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, control the second solenoid valve to open, so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0133] Optionally, the device further includes:

[0134] A fourth determination module, configured to determine whether the ambient temperature is greater than a second temperature threshold when the current operating mode is a cooling operating mode;

[0135] A fifth control module, configured to, if the ambient temperature is less than or equal to the second temperature threshold, control the first solenoid valve to open, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, control the second solenoid valve to open, so that the refrigerant cooled by the gas-liquid separator flows into the shell-and-tube heat exchanger through the refrigerant circuit.

[0136] Optionally, the device further includes:

[0137] A sixth control module, configured to control the first solenoid valve and the second solenoid valve to close when the ambient temperature is greater than the first temperature threshold in the heating operating mode, or when the ambient temperature is greater than the second temperature threshold in the cooling operating mode.

[0138] In another embodiment of the present application, an air-conditioning system is further provided, including a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus;

[0139] The memory is used to store a computer program;

[0140] A processor, when executing a program stored in a memory, implements the control method of the air-conditioning system described in any of the foregoing method embodiments.

[0141] In the air-conditioning system provided by the embodiments of the present invention, the processor exchanges heat inside the gas-liquid separator through high-temperature refrigerant from the shell-and-tube heat exchanger by executing a program stored in the memory, increases the refrigerant temperature in the gas-liquid separator, promotes refrigerant vaporization, generates disturbances in the gas-liquid separator, reduces the viscosity of the oil, increases the fusion of the oil and the refrigerant, thereby making it easier for the compressor to return oil, ensuring the oil return reliability of the air-conditioning system. Moreover, this part of the refrigerant is subcooled through heat exchange inside the gas-liquid separator, increasing the subcooling degree, which can ensure that it remains in a liquid state after passing through the IPM heat dissipation module, ensuring the throttling effect and also increasing the heat exchange capacity.

[0142] The communication bus 1140 mentioned in the above air-conditioning system may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus 1140 can be divided into an address bus, a data bus, a control bus, etc. For the sake of simplicity of representation, Figure 6 only a thick line is used to represent it in the figure, but it does not mean that there is only one bus or one type of bus.

[0143] The communication interface 1120 is used for communication between the above air-conditioning system and other devices.

[0144] The memory 1130 may include a Random Access Memory (RAM), or may also include a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located far from the aforementioned processor.

[0145] The above-mentioned processor 1110 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0146] It should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0147] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An air conditioning system, characterized in that: include: Refrigerant circulation circuit and refrigerant flow path; The input end of the refrigerant flow path is connected to the liquid pipe of the shell and tube heat exchanger in the refrigerant circulation circuit, the output end of the refrigerant flow path is connected to the liquid inlet hole of the gas-liquid separator in the refrigerant circulation circuit, and a first solenoid valve is provided on the refrigerant flow path; When the first solenoid valve is opened, high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

2. A control method for an air conditioning system, characterized in that: include: Obtaining a current operating mode of the air conditioning system according to claim 1; Get the ambient temperature of the environment where the air conditioning system is located; When the current operation mode is a heating operation mode, determining whether the ambient temperature is less than or equal to a first temperature threshold; If the ambient temperature is less than or equal to a first temperature threshold, the first solenoid valve is controlled to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

3. The control method of the air conditioning system according to claim 2, characterized in that: The method further comprises: When the current operation mode is a cooling operation mode, determining whether the ambient temperature is greater than a second temperature threshold; If the ambient temperature is less than or equal to a second temperature threshold, the first solenoid valve is controlled to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

4. The control method of the air conditioning system according to claim 2, characterized in that: The method further comprises: When the current operation mode is a heating operation mode, if the ambient temperature is greater than a first temperature threshold, or when the current operation mode is a cooling operation mode, if the ambient temperature is greater than a second temperature threshold, the first solenoid valve is controlled to be closed.

5. An air conditioning system, characterized in that: include: Refrigerant circulation circuit, refrigerant flow path and refrigerant circuit; The input end of the refrigerant flow path is connected to the liquid pipe of the shell and tube heat exchanger in the refrigerant circulation circuit, the output end of the refrigerant flow path is connected to the liquid inlet hole of the gas-liquid separator in the refrigerant circulation circuit, and a first solenoid valve is provided on the refrigerant flow path; The input end of the refrigerant circuit is connected to the liquid outlet of the gas-liquid separator in the refrigerant circulation circuit, the output end of the refrigerant circuit is connected to the liquid pipe of the shell and tube heat exchanger in the refrigerant circulation circuit, and a second solenoid valve is provided on the refrigerant circuit; When the first solenoid valve is opened, high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; when the second solenoid valve is opened, the refrigerant cooled by the gas-liquid separator flows into the shell and tube heat exchanger through the refrigerant circuit.

6. A control method for an air conditioning system, characterized in that: include: Obtaining a current operating mode of the air conditioning system according to claim 5; Get the ambient temperature of the environment where the air conditioning system is located; When the current operation mode is a heating operation mode, determining whether the ambient temperature is less than or equal to a first temperature threshold; If the ambient temperature is less than or equal to the first temperature threshold, the first solenoid valve is controlled to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, the second solenoid valve is controlled to open so that the refrigerant cooled by the gas-liquid separator flows into the shell and tube heat exchanger through the refrigerant circuit.

7. The control method of the air conditioning system according to claim 6, characterized in that: The method further comprises: When the current operation mode is a cooling operation mode, determining whether the ambient temperature is greater than a second temperature threshold; If the ambient temperature is less than or equal to the second temperature threshold, the first solenoid valve is controlled to open so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, the second solenoid valve is controlled to open so that the refrigerant cooled by the gas-liquid separator flows into the shell and tube heat exchanger through the refrigerant circuit.

8. The control method of the air conditioning system according to claim 6, characterized in that: The method further comprises: When the current operation mode is a heating operation mode, if the ambient temperature is greater than a first temperature threshold, or when the current operation mode is a cooling operation mode, if the ambient temperature is greater than a second temperature threshold, the first solenoid valve and the second solenoid valve are controlled to be closed.

9. A control device for an air conditioning system, characterized in that: include: A first acquisition module, configured to acquire a current operation mode of the air conditioning system according to claim 1; The second acquisition module is used to obtain the ambient temperature of the environment where the air conditioning system is located; A first determination module, configured to determine whether the ambient temperature is less than or equal to a first temperature threshold when the current operation mode is a heating operation mode; The first control module is used to control the first solenoid valve to open if the ambient temperature is less than or equal to a first temperature threshold, so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path.

10. A control device for an air conditioning system, characterized in that: include: A third acquisition module, configured to acquire a current operation mode of the air conditioning system according to claim 5; A fourth acquisition module is used to obtain the ambient temperature of the environment where the air conditioning system is located; A second determination module, configured to determine whether the ambient temperature is less than or equal to a first temperature threshold when the current operation mode is a heating operation mode; The second control module is used to control the first solenoid valve to open if the ambient temperature is less than or equal to the first temperature threshold so that the high-temperature refrigerant flows into the gas-liquid separator through the refrigerant flow path; while controlling the first solenoid valve to open, the second solenoid valve is controlled to open at the same time so that the refrigerant cooled by the gas-liquid separator flows into the shell and tube heat exchanger through the refrigerant circuit.

11. An air conditioning system, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; The processor is used to implement the control method of the air-conditioning system described in any one of claims 2 to 4, or the control method of the air-conditioning system described in any one of claims 5 to 8 when executing the program stored in the memory.

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