An air conditioning system, an air conditioning system control method, a device, and a storage medium

Abstract

The embodiment of the application discloses an air conditioning system, an air conditioning system control method, equipment and a storage medium, the air conditioning system comprises a fin heat exchanger, a heat exchange unit, a liquid storage tank, a first electromagnetic valve and a second electromagnetic valve; the output port of the fin heat exchanger is connected with the first input port of the heat exchange unit; the output port of the heat exchange unit is connected with the input port of the first electromagnetic valve and the input port of the fin heat exchanger; the output port of the first electromagnetic valve is connected with the top of the liquid storage tank, and the bottom of the liquid storage tank is connected with the input port of the second electromagnetic valve; the output port of the second electromagnetic valve is connected with the second input port of the heat exchange unit; the first electromagnetic valve is used for being opened when entering the defrosting mode and being closed when the liquid level in the liquid storage tank reaches a first liquid level; the second electromagnetic valve is used for being opened when exiting the defrosting mode and being closed when the liquid level in the liquid storage tank is lower than a second liquid level, so that the problem of high failure rate of the air conditioning system is solved, the accumulation of refrigerant on the high-pressure side is reduced, the gas pressure on the high-pressure side is reduced, and the stability and reliability of the air conditioning system are improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning system technology, and in particular to an air conditioning system, an air conditioning system control method, equipment and storage medium. Background Technology

[0002] Traditional heat pump air conditioning systems enter defrost mode when the coil temperature is lower than the preset low temperature value, and exit defrost mode when the coil temperature reaches the preset high temperature value.

[0003] When used in low-temperature regions, such as northern areas, cold weather often occurs. The coil temperature of the heat pump air conditioning system may not reach the preset high temperature value required to exit defrost mode due to the cold weather. In this case, defrosting will typically continue until the threshold time for forcibly exiting defrost mode is reached. During continuous defrosting, if the unit's electronic expansion valve is undersized, it cannot continuously pass through excessive refrigerant. The refrigerant will gradually accumulate on the high-pressure side. This is usually during high-frequency operation, where the refrigerant flow rate accelerates, making the accumulation more pronounced. As more and more refrigerant accumulates on the high-pressure side, the pressure increases until it reaches the limit value of the pressure switch, resulting in a high-pressure fault.

[0004] Existing heat pump air conditioning systems have a high failure rate when used in areas with low temperatures. Summary of the Invention

[0005] This application provides an air conditioning system, an air conditioning system control method, an equipment, and a storage medium, which can solve the problem of high failure rate of air conditioning systems, reduce the accumulation of refrigerant on the high-pressure side of the air conditioning system in defrost mode, reduce the gas pressure on the high-pressure side, avoid high-pressure failures, and improve the stability and reliability of the air conditioning system.

[0006] In a first aspect, embodiments of this application provide an air conditioning system, including a finned heat exchanger, a heat exchange unit, a liquid storage tank, a first solenoid valve, and a second solenoid valve;

[0007] The output port of the finned heat exchanger is connected to the first input port of the heat exchange unit;

[0008] The output port of the heat exchange unit is connected to the input port of the first solenoid valve and the input port of the finned heat exchanger.

[0009] The output port of the first solenoid valve is connected to the top of the liquid storage tank, and the bottom of the liquid storage tank is connected to the input port of the second solenoid valve.

[0010] The output port of the second solenoid valve is connected to the second input port of the heat exchange unit;

[0011] The first solenoid valve is used to open when the air conditioning system enters the defrost mode and to close when the liquid level in the liquid tank reaches a preset first liquid level.

[0012] The second solenoid valve is used to open when the air conditioning system exits the defrost mode and to close when the liquid level in the liquid tank is lower than a preset second liquid level.

[0013] Furthermore, the heat exchange unit includes a four-way valve, a shell-and-tube heat exchanger, a gas-liquid separator, a compressor, a first combination valve, a filter, a plate heat exchanger, a first electronic expansion valve, and a second electronic expansion valve.

[0014] The output port of the finned heat exchanger is connected to the input port of the shell-and-tube heat exchanger, the input port of the gas-liquid separator, and the first output port of the compressor via the four-way valve.

[0015] The output port of the gas-liquid separator is connected to the first input port of the compressor;

[0016] The output port of the shell-and-tube heat exchanger is connected to the first input port of the first combined valve.

[0017] The first output port of the first combined valve is connected to the input port of the filter;

[0018] The filter's output port is connected to the first input port of the plate heat exchanger;

[0019] The first output port of the plate heat exchanger is connected to the second input port of the compressor, and the second output port of the plate heat exchanger is connected to its second input port through the first electronic expansion valve;

[0020] The second output port of the plate heat exchanger is also connected to the input port of the second electronic expansion valve, and the input port of the second electronic expansion valve is also connected to the output port of the second solenoid valve. The second electronic expansion valve is used to receive the refrigerant transferred from the liquid storage tank by the second solenoid valve.

[0021] The output port of the second electronic expansion valve is connected to the second input port of the first combined valve;

[0022] The second output port of the first combined valve is connected to the input port of the first solenoid valve and the input port of the finned heat exchanger.

[0023] Furthermore, the heat exchange unit also includes a first three-way valve, a second three-way valve, and a third three-way valve;

[0024] The inlet of the first three-way valve is connected to the second outlet of the plate heat exchanger;

[0025] The first output port of the first three-way valve is connected to the input port of the first electronic expansion valve, and the output port of the first electronic expansion valve is connected to the second input port of the plate heat exchanger.

[0026] The second output port of the first three-way valve is connected to the first input port of the second three-way valve;

[0027] The second input port of the second three-way valve is connected to the output port of the second solenoid valve, and the output port of the second three-way valve is connected to the input port of the second electronic expansion valve;

[0028] The inlet of the third three-way valve is connected to the second outlet of the first combined valve;

[0029] The first output port of the third three-way valve is connected to the input port of the first solenoid valve, and the second output port of the third three-way valve is connected to the input port of the finned heat exchanger.

[0030] Furthermore, the first electronic expansion valve is an enthalpy-increasing electronic expansion valve.

[0031] Furthermore, the first combination valve includes a fourth three-way valve, a fifth three-way valve, a sixth three-way valve, a seventh three-way valve, a first check valve, a second check valve, a third check valve, and a fourth check valve;

[0032] The first inlet of the fourth three-way valve is connected to the outlet of the shell-and-tube heat exchanger, the second inlet of the fourth three-way valve is connected to the outlet of the first one-way valve, and the outlet of the fourth three-way valve is connected to the inlet of the second one-way valve.

[0033] The output port of the second one-way valve is connected to the first input port of the fifth three-way valve;

[0034] The second inlet of the fifth three-way valve is connected to the outlet of the third one-way valve, and the outlet of the fifth three-way valve is connected to the inlet of the filter.

[0035] The input port of the sixth three-way valve is connected to the output port of the second electronic expansion valve, the first output port of the sixth three-way valve is connected to the input port of the first one-way valve, and the second output port of the sixth three-way valve is connected to the input port of the fourth one-way valve.

[0036] The output port of the fourth one-way valve is connected to the first input port of the seventh three-way valve, the first output port of the seventh three-way valve is connected to the input port of the third one-way valve, and the second output port of the seventh three-way valve is connected to the input port of the third three-way valve.

[0037] Furthermore, the storage tank includes a first level gauge and a second level gauge;

[0038] Both the first level gauge and the second level gauge are installed inside the storage tank;

[0039] The first liquid level gauge is set at a preset first liquid level height position inside the liquid storage tank, and the second liquid level gauge is set at a preset second liquid level height position inside the liquid storage tank, wherein the first liquid level is higher than the second liquid level.

[0040] In a second aspect, embodiments of this application provide an air conditioning system control method for controlling the air conditioning system described in the first aspect, comprising:

[0041] Detect the fan speed of the air conditioning system and determine the current operating mode of the air conditioning system based on the fan speed;

[0042] When the working mode is to enter defrost mode, the first solenoid valve is opened to allow part of the refrigerant in the refrigerant circulation loop to enter the liquid storage tank.

[0043] The liquid level in the storage tank is continuously monitored, and when the liquid level reaches a preset first liquid level, the first solenoid valve is closed.

[0044] When the working mode is to exit defrost mode, the second solenoid valve is opened to allow the refrigerant in the liquid storage tank to be returned to the refrigerant circulation loop;

[0045] The liquid level in the storage tank is continuously monitored, and when the liquid level is lower than a preset second liquid level, the second solenoid valve is closed.

[0046] Furthermore, the step of detecting the fan speed of the air conditioning system and determining the current operating mode of the air conditioning system based on the fan speed includes:

[0047] Detect the fan speed of the air conditioning system;

[0048] When the fan speed is zero, the current operating mode of the air conditioning system is determined to be defrosting mode;

[0049] When the fan speed is greater than zero, the current operating mode of the air conditioning system is determined to be to exit the defrost module.

[0050] In a third aspect, embodiments of this application provide an air conditioning system control device, comprising:

[0051] Memory and one or more processors;

[0052] The memory is used to store one or more programs;

[0053] When the one or more programs are executed by the one or more processors, the one or more processors implement the air conditioning system control method as described in the second aspect.

[0054] In a fourth aspect, embodiments of this application provide a storage medium for storing computer-executable instructions, which, when executed by a computer processor, are used to perform the air conditioning system control method as described in the second aspect.

[0055] This embodiment of the application adds a liquid receiver tank, a first solenoid valve, and a second solenoid valve to the air conditioning system. The input port of the first solenoid valve is connected to the output port of the heat exchanger unit and the input port of the finned heat exchanger. The output port of the first solenoid valve is connected to the top of the liquid receiver tank, and the bottom of the liquid receiver tank is connected to the input port of the second solenoid valve. The output port of the second solenoid valve is connected to the second input port of the heat exchanger unit. Using this technology, the first solenoid valve can be opened when the air conditioning system enters defrost mode, allowing some of the refrigerant transferred from the heat exchanger unit to the finned heat exchanger to enter the liquid receiver tank. This solves the problem of high failure rate in air conditioning systems, reduces refrigerant accumulation on the high-pressure side during defrost mode, lowers the high-pressure side pressure, avoids high-pressure failures, and improves the stability and reliability of the air conditioning system. Furthermore, when the air conditioning system exits defrost mode, the second solenoid valve is opened, allowing the refrigerant in the liquid receiver tank to be input into the heat exchanger unit for reuse, improving refrigerant recycling rate and avoiding resource waste. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the normal heating cycle of an air conditioning system provided in an embodiment of this application;

[0057] Figure 2 This is a schematic diagram of the defrosting mode cycle of an air conditioning system provided in an embodiment of this application;

[0058] Figure 3 This is a flowchart of an air conditioning system control method provided in an embodiment of this application;

[0059] Figure 4 This is a schematic diagram of the structure of an air conditioning system control device provided in an embodiment of this application. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. It should also be noted that, for ease of description, only the parts relevant to this application are shown in the drawings, not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. A process can be terminated when its operation is completed, but it may also have additional steps not included in the drawings. A process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0061] When existing air conditioning systems are used in low-temperature areas, the coil temperature may not reach the preset high temperature value required to exit defrost mode due to the cold weather. In this case, defrosting will usually continue until the threshold time for forcibly exiting defrost mode is reached. During continuous defrosting, if the unit's electronic expansion valve is undersized, it cannot continuously pass through excessive refrigerant. The refrigerant will gradually accumulate on the high-pressure side. This is usually done at high frequency, where the refrigerant flow rate will accelerate, making the accumulation phenomenon more obvious. As more and more refrigerant accumulates on the high-pressure side, the pressure on the high-pressure side will increase until it reaches the limit value of the pressure switch, resulting in a high-pressure fault. Based on this, the air conditioning system, air conditioning system control method, device, and storage medium provided in this application embodiment are designed to address the issue of high failure rates in air conditioning systems. When defrosting in low-temperature areas, the first solenoid valve is opened when the air conditioning system enters defrost mode, allowing a portion of the refrigerant transferred from the heat exchanger unit to the finned heat exchanger to enter the liquid receiver tank. Compared to existing air conditioning systems where refrigerant accumulates on the high-pressure side during defrost mode, this embodiment, by storing a portion of the refrigerant in the liquid receiver tank, reduces refrigerant accumulation on the high-pressure side during defrost mode, lowers the high-pressure side pressure, avoids high-pressure failures, and improves the stability and reliability of the air conditioning system. Furthermore, when the air conditioning system exits defrost mode, the second solenoid valve is opened, allowing the refrigerant in the liquid receiver tank to be input into the heat exchanger unit for reuse, improving refrigerant recycling rates and avoiding resource waste.

[0062] Figure 1 This is a schematic diagram of the normal heating cycle of an air conditioning system provided in an embodiment of this application, with reference to... Figure 1The air conditioning system includes a finned heat exchanger 10, a heat exchange unit 20, a liquid receiver 30, a first solenoid valve 40, and a second solenoid valve 50. The output port of the finned heat exchanger 10 is connected to the first input port of the heat exchange unit 20; the output port of the heat exchange unit 20 is connected to both the input port of the first solenoid valve 40 and the input port of the finned heat exchanger 10; the output port of the first solenoid valve 40 is connected to the top of the liquid receiver 30, and the bottom of the liquid receiver 30 is connected to the input port of the second solenoid valve 50; the output port of the second solenoid valve 50 is connected to the second input port of the heat exchange unit 20. The first solenoid valve 40 is opened when the air conditioning system enters defrost mode and closed when the liquid level in the liquid receiver 30 reaches a preset first liquid level. The second solenoid valve 50 is opened when the air conditioning system exits defrost mode and closed when the liquid level in the liquid receiver 30 falls below a preset second liquid level. The air conditioning system provided in this application embodiment opens the first solenoid valve 40 when entering the defrost mode, allowing part of the refrigerant transferred from the heat exchange unit 20 to the finned heat exchanger 10 to enter the liquid receiver 30. This solves the problem of high failure rate of the air conditioning system, reduces the accumulation of refrigerant on the high-pressure side of the air conditioning system in the defrost mode, lowers the gas pressure on the high-pressure side, avoids high-pressure failure, and improves the stability and reliability of the air conditioning system. In addition, when the air conditioning system exits the defrost mode, the second solenoid valve 50 is opened, allowing the refrigerant in the liquid receiver 30 to be input into the heat exchange unit 20 for reuse, improving the refrigerant recycling rate and avoiding resource waste.

[0063] In one embodiment, the liquid storage tank 30 includes a first level gauge 301 and a second level gauge 302. Both the first level gauge 301 and the second level gauge 302 are disposed within the liquid storage tank 30. The first level gauge 301 is positioned at a preset first liquid level height within the liquid storage tank 30, and the second level gauge 302 is positioned at a preset second liquid level height within the liquid storage tank 30. The first liquid level is higher than the second liquid level. By installing the first level gauge 301 and the second level gauge 302 in the liquid storage tank 30, the liquid level information within the liquid storage tank 30 can be obtained in real time. This allows for the start / stop control of the first solenoid valve 40 and the second solenoid valve 50 based on the liquid level information, preventing refrigerant overflow from the liquid storage tank 30, which could lead to expansion and malfunction. Furthermore, it prevents the liquid storage tank 30 from being emptied of refrigerant, which could cause pressure deformation, thereby improving the service life of the liquid storage tank 30.

[0064] The heat exchange unit 20 includes a four-way valve 201, a shell-and-tube heat exchanger 202, a gas-liquid separator 203, a compressor 204, a first combination valve 205, a filter 206, a plate heat exchanger 207, a first electronic expansion valve 208, and a second electronic expansion valve 209. The output port of the finned heat exchanger 10 is connected to the input port of the shell-and-tube heat exchanger 202, the input port of the gas-liquid separator 203, and the first output port of the compressor 204 via the four-way valve 201. Specifically, the first input port of the four-way valve 201 is connected to the output port of the finned heat exchanger 10, the second input port of the four-way valve 201 is connected to the first output port of the compressor 204, the first output port of the four-way valve 201 is connected to the input port of the shell-and-tube heat exchanger 202, and the second output port of the four-way valve 201 is connected to the input port of the gas-liquid separator 203. Compressor 204 compresses high-temperature, high-pressure exhaust gas through its first outlet, which is then transmitted via four-way valve 201 to shell-and-tube heat exchanger 202 and gas-liquid separator 203. Shell-and-tube heat exchanger 202 acts as a condenser, condensing the high-temperature, high-pressure exhaust gas from compressor 204 into high-pressure liquid refrigerant, which flows to first combination valve 205. The outlet of gas-liquid separator 203 is connected to the first inlet of compressor 204. The outlet of shell-and-tube heat exchanger 202 is connected to the first inlet of first combination valve 205; the first outlet of first combination valve 205 is connected to the inlet of filter 206; the outlet of filter 206 is connected to the first inlet of plate heat exchanger 207. The high-pressure liquid refrigerant is transmitted via first combination valve 205 to plate heat exchanger 207 for secondary heat exchange and subcooling. The first output port of plate heat exchanger 207 is connected to the second input port of compressor 204. Plate heat exchanger 207 is used to inject gas and increase enthalpy to compressor 204 through the first output port. The second output port of plate heat exchanger 207 is connected to its second input port through a first electronic expansion valve 208. The second output port of plate heat exchanger 207 is also connected to the input port of second electronic expansion valve 209, which is also connected to the output port of second solenoid valve 50. Second electronic expansion valve 209 is used to receive refrigerant transferred from liquid storage tank 30 by second solenoid valve 50. The output port of second electronic expansion valve 209 is connected to the second input port of first combination valve 205; the second output port of first combination valve 205 is connected to the input port of first solenoid valve 40 and the input port of finned heat exchanger 10. The first combination valve 205 is used to transfer refrigerant to the inlet of the finned heat exchanger 10 through its second outlet, and to transfer refrigerant to the liquid storage tank 30 when the first solenoid valve 40 is opened.

[0065] In one embodiment, the first electronic expansion valve 208 is an enthalpy-increasing electronic expansion valve, and the second electronic expansion valve 209 is a heating electronic expansion valve.

[0066] As described above, a heat exchange unit 20, consisting of a shell-and-tube heat exchanger 202, a gas-liquid separator 203, a compressor 204, and a plate heat exchanger 207, is used for refrigerant heat exchange. The heat exchange unit 20, in conjunction with the finned heat exchanger 10, forms a refrigerant circulation loop, realizing the heat exchange function of the air conditioning system. By adding a first solenoid valve 40, a liquid receiver 30, and a second solenoid valve 50 to the refrigerant circulation loop of the air conditioning system, the first solenoid valve 40 is opened when the air conditioning system enters defrost mode. This allows a portion of the refrigerant transferred from the heat exchange unit 20 to the finned heat exchanger 10 to enter the liquid receiver 30. Compared to existing air conditioning systems without the first solenoid valve 40, liquid receiver 30, and second solenoid valve 50, the air conditioning system of this embodiment can reduce refrigerant accumulation on the high-pressure side during defrost mode, lower the high-pressure side pressure, avoid high-pressure failures, and improve the stability and reliability of the air conditioning system.

[0067] The heat exchange unit also includes a first three-way valve 210, a second three-way valve 211, and a third three-way valve 212. The inlet of the first three-way valve 210 is connected to the second outlet of the plate heat exchanger 207; the first outlet of the first three-way valve 210 is connected to the inlet of the first electronic expansion valve 208, and the outlet of the first electronic expansion valve 208 is connected to the second inlet of the plate heat exchanger 207. The second outlet of the first three-way valve 210 is connected to the first inlet of the second three-way valve 211; the second inlet of the second three-way valve 211 is connected to the outlet of the second solenoid valve 50, and the outlet of the second three-way valve 211 is connected to the inlet of the second electronic expansion valve 209. The inlet of the third three-way valve 212 is connected to the second outlet of the first combination valve 205; the first outlet of the third three-way valve 212 is connected to the inlet of the first solenoid valve 40, and the second outlet of the third three-way valve 212 is connected to the inlet of the finned heat exchanger 10. By setting the first three-way valve 210, the second three-way valve 211, and the third three-way valve 212, the flow direction and velocity of the refrigerant can be effectively controlled, thereby improving the stability of refrigerant transmission in the air conditioning system.

[0068] The first combination valve 205 includes a fourth three-way valve 2051, a fifth three-way valve 2052, a sixth three-way valve 2053, a seventh three-way valve 2054, a first one-way valve 2055, a second one-way valve 2056, a third one-way valve 2057, and a fourth one-way valve 2058. The first inlet of the fourth three-way valve 2051 is connected to the outlet of the shell-and-tube heat exchanger 202; the second inlet of the fourth three-way valve 2051 is connected to the outlet of the first one-way valve 2055; and the outlet of the fourth three-way valve 2051 is connected to the inlet of the second one-way valve 2056. The outlet of the second one-way valve 2056 is connected to the first inlet of the fifth three-way valve 2052; the second inlet of the fifth three-way valve 2052 is connected to the outlet of the third one-way valve 2057; and the outlet of the fifth three-way valve 2052 is connected to the inlet of the filter 206. The inlet of the sixth three-way valve 2053 is connected to the outlet of the second electronic expansion valve 209. The first outlet of the sixth three-way valve 2053 is connected to the inlet of the first one-way valve 2055, and the second outlet of the sixth three-way valve 2053 is connected to the inlet of the fourth one-way valve 2058. The outlet of the fourth one-way valve 2058 is connected to the first inlet of the seventh three-way valve 2054, the first outlet of the seventh three-way valve 2054 is connected to the inlet of the third one-way valve 2057, and the second outlet of the seventh three-way valve 2054 is connected to the inlet of the third three-way valve 212. Through the configuration of the first combination valve 205, the refrigerant can be transmitted according to a preset flow direction, achieving orderly refrigerant distribution, improving the stability of refrigerant transmission in the air conditioning system, thereby improving the overall stability of the air conditioning system and extending its service life.

[0069] It should be noted that the aforementioned input and output ports refer to the normal heating cycle of the air conditioning system. When the air conditioning system is in defrost mode, some input ports become output ports, and some output ports become corresponding input ports.

[0070] It should be noted that, referring to Figure 1 During the normal heating cycle of the air conditioning system, the first solenoid valve 40 is closed, and the second solenoid valve 50 is opened until the liquid level in the liquid tank 30 is lower than the preset second liquid level and then closes.

[0071] Figure 2 This is a schematic diagram of the defrosting mode cycle of an air conditioning system provided in an embodiment of this application, referring to... Figure 2The connections between the various devices in the air conditioning system remain unchanged, but the input and output ports of some devices are interchanged. Specifically, the input port of finned heat exchanger 10 becomes the output port, and the output port becomes the input port. The input port of shell-and-tube heat exchanger 202 becomes the output port, and the output port becomes the input port. The first input port of the fourth three-way valve 2051 becomes the output port, and the second output port of the seventh three-way valve 2054 becomes the input port. The first input port of the four-way valve 201 becomes the output port, and the first output port becomes the input port. The input and output ports of other devices remain unchanged.

[0072] It should be noted that, referring to Figure 2 When the air conditioning system is in defrost mode, the second solenoid valve 50 is closed. When the defrost mode is started, the first solenoid valve 40 opens until the liquid level in the liquid tank 30 reaches the preset first liquid level, at which point it closes.

[0073] Figure 3 This is a flowchart illustrating an air conditioning system control method provided in an embodiment of this application. The air conditioning system control method provided in this embodiment can be executed by an air conditioning system control device, which can be implemented through software and / or hardware. The air conditioning system control device can consist of two or more physical entities, or it can consist of a single physical entity. Generally, the air conditioning system control device can be the control device for an air conditioning system.

[0074] The following description uses the control equipment of an air conditioning system as the main body for implementing the air conditioning system control method. (Refer to...) Figure 3 The air conditioning system control method, used to control the aforementioned air conditioning system, specifically includes:

[0075] S101. Detect the fan speed of the air conditioning system and determine the current operating mode of the air conditioning system based on the fan speed.

[0076] The control strategies for the normal circulation mode and defrost mode of an air conditioning system are different. Therefore, it is necessary to first determine the current operating mode of the air conditioning system before executing the corresponding control strategy. This can be achieved by detecting the fan speed of the air conditioning system. For example, the fan speed can be detected at preset intervals (e.g., 1 minute) to determine the current operating state of the air conditioning system. When the fan speed is zero, the current operating mode is confirmed to be defrost mode, and the control strategy for defrost mode is executed. When the fan speed is not zero, the current operating mode is confirmed to be out of defrost mode, i.e., heating or cooling mode, and the corresponding control strategy for exiting defrost mode is executed. By detecting the fan speed to determine the current operating mode of the air conditioning system and then implementing the corresponding control strategy, the air conditioning system can operate in an orderly manner according to the current operating mode, improving work efficiency.

[0077] S102. When the working mode is to enter defrost mode, the first solenoid valve is opened so that part of the refrigerant in the refrigerant circulation loop enters the liquid storage tank.

[0078] The current operating mode of the air conditioning system is determined by the fan speed. When the system is in defrost mode, the refrigerant flow direction is as follows: Figure 2 As shown, at this time, the first solenoid valve is opened, so that part of the refrigerant flowing out of the finned heat exchanger flows into the liquid receiver through the third three-way valve and the first solenoid valve. This allows part of the refrigerant in the refrigerant circulation loop to enter the liquid receiver, reducing the accumulation of refrigerant on the high-pressure side of the air conditioning system in defrost mode, lowering the gas pressure on the high-pressure side, avoiding high-pressure failures, and improving the stability and reliability of the air conditioning system.

[0079] S103. Continuously acquire the liquid level in the storage tank, and close the first solenoid valve when the liquid level reaches the preset first liquid level.

[0080] Because the storage tank has a limited capacity, expansion and deformation will occur when the refrigerant flowing in exceeds its maximum capacity. Therefore, after the first solenoid valve is opened, the liquid level in the storage tank needs to be continuously monitored. When the liquid level in the storage tank reaches the preset first liquid level, the first solenoid valve is closed to prevent deformation caused by overload of the storage tank, thus protecting the storage tank, improving its service life, and preventing damage from deformation of the storage tank from affecting the operation of the air conditioning system, thereby improving the stability and reliability of the air conditioning system.

[0081] It should be noted that the first liquid level is set to a preset position on the upper half of the storage tank, as shown in the reference. Figure 1 and Figure 2The first level gauge can be set at a certain position from the top of the storage tank, which is the first level, so as to determine whether the liquid level in the storage tank has reached the first level.

[0082] S104. When the working mode is to exit defrost mode, open the second solenoid valve to allow the refrigerant in the liquid tank to be returned to the refrigerant circulation loop.

[0083] The current operating mode of the air conditioning system is determined by the fan speed. When the defrost mode is exited, the refrigerant flow direction after exiting defrost mode is as follows: Figure 1 As shown, at this time, the second solenoid valve is opened, so that the refrigerant in the liquid storage tank is returned to the heat exchange unit through the second solenoid valve, so that the refrigerant in the liquid storage tank is returned to the refrigerant circulation loop, so as to realize the recycling of refrigerant, improve the refrigerant utilization rate, and avoid resource waste.

[0084] S105. Continuously monitor the liquid level in the storage tank. When the liquid level is lower than the preset second liquid level, close the second solenoid valve.

[0085] After the liquid storage tank is emptied, the second solenoid valve is connected to the low-pressure side. If the second solenoid valve remains open, it will continue to expel gas from the tank, causing a pressure difference between the inside and outside of the tank and resulting in deformation. To prevent malfunctions due to tank deformation, the liquid level in the tank is continuously monitored after the second solenoid valve is opened. When the liquid level falls below a preset second level, the second solenoid valve is closed to prevent deformation caused by emptying the tank, thereby extending the tank's lifespan and preventing damage from tank deformation that could affect the operation of the air conditioning system, thus improving the stability and reliability of the air conditioning system.

[0086] It should be noted that the second liquid level is set to a preset position in the lower half of the storage tank, as shown in the reference. Figure 1 and Figure 2 The second level gauge can be set at a certain position from the bottom of the storage tank, which is the second level, so as to determine whether the liquid level in the storage tank is lower than the second level.

[0087] As described above, by detecting the fan speed of the air conditioning system, the current operating mode of the air conditioning system is determined based on the fan speed. When the operating mode is in defrost mode, the first solenoid valve is opened to transfer a portion of the refrigerant in the refrigerant circulation loop to the liquid receiver tank. The first solenoid valve closes when the liquid level in the liquid receiver tank reaches a preset first level to prevent deformation caused by overload, thus protecting the liquid receiver tank, extending its service life, and preventing deformation damage that could affect the operation of the air conditioning system, thereby improving the stability and reliability of the air conditioning system. When the operating mode is in defrost mode exit, the second solenoid valve is opened to return the refrigerant in the liquid receiver tank to the refrigerant circulation loop. The second solenoid valve closes when the liquid level in the liquid receiver tank falls below a preset second level to prevent deformation caused by emptying the liquid receiver tank, thus extending the service life of the liquid receiver tank and preventing deformation damage that could affect the operation of the air conditioning system, thereby improving the stability and reliability of the air conditioning system.

[0088] This application provides an air conditioning system control device, referring to... Figure 4 The air conditioning system control device includes: a processor 31, a memory 32, a communication module 33, an input device 34, and an output device 35. The air conditioning system control device may have one or more processors, and the air conditioning system control device may have one or more memories. The processor, memory, communication module, input device, and output device of the air conditioning system control device can be connected via a bus or other means.

[0089] The memory 32, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as program instructions / modules corresponding to the air conditioning system control method described in any embodiment of this application (e.g., control devices in an air conditioning system). The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the device. Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to the device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0090] The communication module 33 is used for data transmission.

[0091] The processor 31 executes various functional applications and data processing of the device by running software programs, instructions and modules stored in the memory, thereby realizing the above-mentioned air conditioning system control method.

[0092] Input device 34 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the device. Output device 35 may include display devices such as a display screen.

[0093] The air conditioning system control equipment provided above can be used to execute the air conditioning system control method provided in the above embodiments, and has corresponding functions and beneficial effects.

[0094] This application embodiment also provides a storage medium for storing computer-executable instructions. When executed by a computer processor, the computer-executable instructions are used to perform an air conditioning system control method. The air conditioning system control method includes: detecting the fan speed of the air conditioning system; determining the current operating mode of the air conditioning system based on the fan speed; when the operating mode is entering defrost mode, opening a first solenoid valve to allow a portion of the refrigerant in the refrigerant circulation loop to enter a liquid storage tank; continuously acquiring the liquid level in the liquid storage tank; and closing the first solenoid valve when the liquid level reaches a preset first liquid level; when the operating mode is exiting defrost mode, opening a second solenoid valve to allow the refrigerant in the liquid storage tank to be returned to the refrigerant circulation loop; and continuously acquiring the liquid level in the liquid storage tank; and closing the second solenoid valve when the liquid level is lower than a preset second liquid level.

[0095] Storage medium – any type of memory device or storage device. The term “storage medium” is intended to include: mounting media, such as CD-ROM, floppy disk, or magnetic tape devices; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. Storage medium may also include other types of memory or combinations thereof. Furthermore, storage medium may reside in a first computer system in which the program is executed, or it may reside in a different second computer system connected to the first computer system via a network (such as the Internet). The second computer system can provide program instructions to the first computer for execution. The term “storage medium” can include two or more storage media residing in different locations (e.g., in different computer systems connected via a network). Storage medium may store program instructions (e.g., specifically implemented as a computer program) executable by one or more processors.

[0096] Of course, the storage medium for storing computer-executable instructions provided in the embodiments of this application is not limited to the air conditioning system control method described above, but can also perform related operations in the air conditioning system control method provided in any embodiment of this application.

[0097] The air conditioning system, storage medium, and air conditioning system control device provided in the above embodiments can execute the air conditioning system control method provided in any embodiment of this application. For technical details not described in detail in the above embodiments, please refer to the air conditioning system control method provided in any embodiment of this application.

[0098] The above description is merely a preferred embodiment and the technical principles employed in this application. This application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that can be made by those skilled in the art will not depart from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the claims.

Claims

1. An air conditioning system, characterized in that, It includes a finned heat exchanger, a heat exchange unit, a liquid storage tank, a first solenoid valve, and a second solenoid valve. The output port of the finned heat exchanger is connected to the first input port of the heat exchange unit; The output port of the heat exchange unit is connected to the input port of the first solenoid valve and the input port of the finned heat exchanger. The output port of the first solenoid valve is connected to the top of the liquid storage tank, and the bottom of the liquid storage tank is connected to the input port of the second solenoid valve. The output port of the second solenoid valve is connected to the second input port of the heat exchange unit; The first solenoid valve is used to open when the air conditioning system enters the defrost mode and to close when the liquid level in the liquid tank reaches a preset first liquid level. The second solenoid valve is used to open when the air conditioning system exits defrost mode and to close when the liquid level in the liquid tank is lower than a preset second liquid level; The heat exchange unit includes a four-way valve, a shell-and-tube heat exchanger, a gas-liquid separator, a compressor, a first combination valve, a filter, a plate heat exchanger, a first electronic expansion valve, and a second electronic expansion valve. The output port of the finned heat exchanger is connected to the input port of the shell-and-tube heat exchanger, the input port of the gas-liquid separator, and the first output port of the compressor via the four-way valve. The output port of the gas-liquid separator is connected to the first input port of the compressor; The output port of the shell-and-tube heat exchanger is connected to the first input port of the first combined valve. The first output port of the first combined valve is connected to the input port of the filter; The filter's output port is connected to the first input port of the plate heat exchanger; The first output port of the plate heat exchanger is connected to the second input port of the compressor, and the second output port of the plate heat exchanger is connected to its second input port through the first electronic expansion valve; The second output port of the plate heat exchanger is also connected to the input port of the second electronic expansion valve, and the input port of the second electronic expansion valve is also connected to the output port of the second solenoid valve. The second electronic expansion valve is used to receive the refrigerant transferred from the liquid storage tank by the second solenoid valve. The output port of the second electronic expansion valve is connected to the second input port of the first combined valve; The second output port of the first combined valve is connected to the input port of the first solenoid valve and the input port of the finned heat exchanger.

2. The air conditioning system according to claim 1, characterized in that, The heat exchange unit also includes a first three-way valve, a second three-way valve, and a third three-way valve; The inlet of the first three-way valve is connected to the second outlet of the plate heat exchanger; The first output port of the first three-way valve is connected to the input port of the first electronic expansion valve, and the output port of the first electronic expansion valve is connected to the second input port of the plate heat exchanger. The second output port of the first three-way valve is connected to the first input port of the second three-way valve; The second input port of the second three-way valve is connected to the output port of the second solenoid valve, and the output port of the second three-way valve is connected to the input port of the second electronic expansion valve; The inlet of the third three-way valve is connected to the second outlet of the first combined valve; The first output port of the third three-way valve is connected to the input port of the first solenoid valve, and the second output port of the third three-way valve is connected to the input port of the finned heat exchanger.

3. The air conditioning system according to claim 2, characterized in that, The first electronic expansion valve is an enthalpy-increasing electronic expansion valve.

4. The air conditioning system according to claim 2, characterized in that, The first combination valve includes a fourth three-way valve, a fifth three-way valve, a sixth three-way valve, a seventh three-way valve, a first check valve, a second check valve, a third check valve, and a fourth check valve; The first inlet of the fourth three-way valve is connected to the outlet of the shell-and-tube heat exchanger, the second inlet of the fourth three-way valve is connected to the outlet of the first one-way valve, and the outlet of the fourth three-way valve is connected to the inlet of the second one-way valve. The output port of the second one-way valve is connected to the first input port of the fifth three-way valve; The second inlet of the fifth three-way valve is connected to the outlet of the third one-way valve, and the outlet of the fifth three-way valve is connected to the inlet of the filter. The input port of the sixth three-way valve is connected to the output port of the second electronic expansion valve, the first output port of the sixth three-way valve is connected to the input port of the first one-way valve, and the second output port of the sixth three-way valve is connected to the input port of the fourth one-way valve. The output port of the fourth one-way valve is connected to the first input port of the seventh three-way valve, the first output port of the seventh three-way valve is connected to the input port of the third one-way valve, and the second output port of the seventh three-way valve is connected to the input port of the third three-way valve.

5. The air conditioning system according to claim 1, characterized in that, The liquid storage tank includes a first liquid level gauge and a second liquid level gauge; Both the first level gauge and the second level gauge are installed inside the storage tank; The first liquid level gauge is set at a preset first liquid level height position inside the liquid storage tank, and the second liquid level gauge is set at a preset second liquid level height position inside the liquid storage tank, wherein the first liquid level is higher than the second liquid level.

6. A method for controlling an air conditioning system, characterized in that, For controlling the air conditioning system according to any one of claims 1-5, comprising: Detect the fan speed of the air conditioning system and determine the current operating mode of the air conditioning system based on the fan speed; When the working mode is to enter defrost mode, the first solenoid valve is opened to allow part of the refrigerant in the refrigerant circulation loop to enter the liquid storage tank. The liquid level in the storage tank is continuously monitored, and when the liquid level reaches a preset first liquid level, the first solenoid valve is closed. When the working mode is to exit defrost mode, the second solenoid valve is opened to allow the refrigerant in the liquid storage tank to be returned to the refrigerant circulation loop; The liquid level in the storage tank is continuously monitored, and when the liquid level is lower than a preset second liquid level, the second solenoid valve is closed.

7. The method according to claim 6, characterized in that, The step of detecting the fan speed of the air conditioning system and determining the current operating mode of the air conditioning system based on the fan speed includes: Detect the fan speed of the air conditioning system; When the fan speed is zero, the current operating mode of the air conditioning system is determined to be defrosting mode; When the fan speed is greater than zero, the current operating mode of the air conditioning system is determined to be to exit the defrost module.

8. An air conditioning system control device, characterized in that, include: Memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 6-7.

9. A storage medium for storing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a processor, are used to perform the method as described in any one of claims 6-7.

Images