Air conditioning system, control method of air conditioning system and air conditioner

Abstract

The invention relates to an air conditioning system, a control method of the air conditioning system and an air conditioner. The system comprises a vapor-liquid separator, a dehumidification device, a vapor branch humidity control flow path and a main path humidity control flow path, the vapor branch humidity control flow path comprises a vapor branch humidity control electromagnetic valve, and the main path humidity control flow path comprises a main path humidity control electromagnetic valve; when the dehumidification function is started, the steam branch humidity control flow path is used for introducing a liquid refrigerant in the steam-liquid separator into the dehumidification device when the steam branch humidity control electromagnetic valve is opened; and when the dehumidification function is started, the main path humidity control flow path is used for introducing a liquid refrigerant flowing through the main path humidity control flow path into the dehumidification device when the main path humidity control electromagnetic valve is opened. The liquid refrigerant is extracted to be supplied to the dehumidification device after the steam branch humidity control flow path or the main path humidity control flow path is opened, the refrigerant in the system can be more effectively utilized to achieve the dehumidification function, additional dehumidification equipment is not needed, and therefore it is guaranteed that the dehumidification device has enough refrigerant supply, and the dehumidification efficiency of the dehumidification device is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning technology, and in particular to an air-conditioning system, a control method for an air-conditioning system, and an air conditioner. Background Art

[0002] Air conditioning systems include air-cooled, evaporative cooling, and natural cooling units. Air-cooled screw heating units are specialized equipment used for both heating and cooling in air conditioning systems and are a type of heat pump unit. Air-cooled screw heating units operating in low-temperature environments often require high dehumidification for heating in specialized areas such as electrical component factories and hospitals. Existing solutions typically utilize independent dehumidifiers for dehumidification, but the resulting heat and cold offsets waste energy and prevent the use of the refrigerant in the air conditioning system for dehumidification.

[0003] It can be seen that how to use the unit itself to dehumidify while heating or cooling becomes particularly important. Summary of the Invention

[0004] The present application provides an air-conditioning system, a control method for the air-conditioning system, and an air conditioner to solve the technical problem that the above-mentioned prior art cannot use the unit to perform dehumidification control while cooling or heating.

[0005] According to one aspect of an embodiment of the present application, the present application provides an air-conditioning system, comprising: a vapor-liquid separator, a dehumidification device, a vapor-separation moisture control flow path and a main moisture control flow path, the vapor-separation moisture control flow path comprising a vapor-separation moisture control solenoid valve, and the main moisture control flow path comprising a main moisture control solenoid valve; when the dehumidification function is turned on, the vapor-separation moisture control flow path is used to introduce the liquid refrigerant in the vapor-liquid separator into the dehumidification device when the vapor-separation moisture control solenoid valve is opened; when the dehumidification function is turned on, the main moisture control flow path is used to introduce the liquid refrigerant flowing through the main moisture control flow path into the dehumidification device when the main moisture control solenoid valve is opened.

[0006] Optionally, the air-conditioning system also includes a first one-way valve, a refrigerant pump, an air supply solenoid valve and a compressor; the vapor-liquid separator, the vapor moisture control solenoid valve, the first one-way valve, the refrigerant pump, the dehumidification device, the air supply solenoid valve and the compressor are connected in sequence to form the vapor moisture control flow path; the main moisture control solenoid valve, the refrigerant pump, the dehumidification device, the air supply solenoid valve and the compressor are connected in sequence to form the main moisture control flow path.

[0007] Optionally, it also includes a hot water heat exchanger, an electronic expansion valve and an evaporator. The compressor, hot water heat exchanger, electronic expansion valve, evaporator and vapor-liquid separator are connected in sequence to form the heating circulation flow path, which is used to control the opening of the heating circulation flow path through the system control unit during the heating process to realize the heating cycle.

[0008] Optionally, a second one-way valve is also included, and the vapor-liquid separator, vapor separation humidity control solenoid valve, first one-way valve, refrigerant pump, dehumidification device, second one-way valve and electronic expansion valve are connected in sequence to form a vapor separation liquid extraction flow path, and the vapor separation liquid extraction flow path is used to pump the liquid refrigerant in the vapor-liquid separator into the rear end flow path of the hot water heat exchanger to be merged into the heating circulation flow path.

[0009] Optionally, a liquid level detection device is provided in the vapor-liquid separator, and the liquid level detection device is used to detect the liquid level of the liquid in the vapor-liquid separator.

[0010] According to another aspect of an embodiment of the present invention, a control method for an air-conditioning system is also provided, which is applied to the air-conditioning system, and the method includes the following steps: when the dehumidification function is turned on, detecting whether the liquid level of the liquid in the vapor-liquid separator is higher than a preset liquid level threshold; if the liquid level of the liquid in the vapor-liquid separator is higher than the preset liquid level threshold, controlling the vapor separation moisture control flow path to open, and extracting the liquid refrigerant in the vapor-liquid separator to drain to the dehumidification device; if the liquid level in the vapor-liquid separator is lower than or equal to the preset liquid level threshold, controlling the main road moisture control flow path to open, and extracting the liquid refrigerant in the heating circulation flow path to drain to the dehumidification device.

[0011] Optionally, after the liquid refrigerant in the vapor-liquid separator is extracted and drained to the dehumidification device and / or the liquid refrigerant in the heating circulation flow is extracted and drained to the dehumidification device, the method further includes: obtaining key state parameters associated with the dehumidification device after the liquid refrigerant is drained to the dehumidification device, determining the return air superheat of the dehumidification device based on the key state parameters; and controlling the fan frequency of the dehumidification device based on the return air superheat.

[0012] Optionally, the key state parameters include the saturation temperature of the dehumidification device and the refrigerant temperature in the rear end flow path of the dehumidification device. The key state parameters associated with the dehumidification device after the liquid refrigerant is drained to the dehumidification device are obtained, and the return air superheat of the dehumidification device is determined according to the key state parameters, including: after the liquid refrigerant is drained to the dehumidification device, detecting the pressure in the dehumidification device; determining the saturation temperature of the dehumidification device according to the pressure in the dehumidification device; detecting the refrigerant temperature in the rear end flow path of the dehumidification device; and determining the return air superheat of the dehumidification device by subtracting the refrigerant temperature from the saturation temperature.

[0013] Optionally, the control of the fan frequency of the dehumidification device based on the return air superheat includes: comparing the return air superheat with a preset maximum return air superheat limit value and a preset minimum return air superheat limit value; if the return air superheat is greater than or equal to the preset maximum return air superheat limit value, controlling the fan frequency of the dehumidification device to decrease; if the return air superheat is less than the preset maximum return air superheat limit value and greater than the preset minimum return air superheat limit value, controlling the fan frequency of the dehumidification device to maintain the current state; if the return air superheat is less than or equal to the preset minimum return air superheat limit value, controlling the fan frequency of the dehumidification device to increase.

[0014] Optionally, the method also includes: when it is detected during operation that the dehumidification function is turned off and the liquid level of the liquid in the vapor-liquid separator is higher than the preset liquid level threshold, the vapor separation moisture control solenoid valve, the first one-way valve, the refrigerant pump and the second refrigerant pump are controlled to open, and the liquid refrigerant in the vapor-liquid separator is pumped into the rear end flow path of the hot water heat exchanger and merged into the heating circulation flow path; when it is detected during operation that the dehumidification function is turned off and the liquid level of the liquid in the vapor-liquid separator is lower than or equal to the preset liquid level threshold, the vapor separation moisture control solenoid valve, the main line moisture control solenoid valve, the first one-way valve, the refrigerant pump, the dehumidification device and the air supply solenoid valve are controlled to close.

[0015] Optionally, the method also includes: when the dehumidification function and the vapor separation moisture control flow path are turned on, or when the dehumidification function and the main moisture control flow path are turned on, continuously detecting whether the liquid level of the liquid in the vapor-liquid separator is higher than the preset liquid level threshold; if the dehumidification function and the vapor separation moisture control flow path are turned on, the liquid level in the vapor-liquid separator is lower than the preset liquid level threshold, then controlling the vapor separation moisture control flow path to close and opening the main moisture control flow path; if the dehumidification function and the main moisture control flow path are turned on, the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold, then controlling the main moisture control flow path to close and opening the vapor separation moisture control flow path.

[0016] According to another aspect of an embodiment of the present application, the present application provides an air conditioner, comprising a memory, a processor, a communication interface and a communication bus, wherein the memory stores a computer program that can be run on the processor, the memory and the processor communicate through the communication bus and the communication interface, and when the processor executes the computer program, the steps of the control method of the air-conditioning system are implemented.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the related art:

[0018] When the air-conditioning system provided by the present application turns on the dehumidification function, when the vapor-liquid control solenoid valve in the vapor-liquid control flow path is opened, it indicates that the liquid refrigerant in the vapor-liquid separator needs to be discharged. Based on the vapor-liquid control flow path connecting the vapor-liquid separator and the dehumidification device, the liquid refrigerant in the vapor-liquid separator can be introduced into the dehumidification device, or when the main moisture control solenoid valve is opened, the liquid refrigerant flowing through the main moisture control flow path will be introduced into the dehumidification device through the main moisture control flow path. The introduction of the liquid refrigerant in the vapor-liquid separator based on the vapor-liquid control flow path can more effectively utilize the refrigerant in the system to achieve the dehumidification function. It can avoid poor dehumidification efficiency of the dehumidification device due to insufficient or unstable refrigerant, thereby ensuring that the dehumidification device has sufficient refrigerant supply. Secondly, it can control the timely emptying of the liquid refrigerant in the vapor-liquid separator to avoid liquid in the air. The dehumidification device is supplied with liquid refrigerant flowing through the main moisture control flow path for dehumidification. Even if the liquid refrigerant in the vapor-liquid separator is not enough to supply the dehumidification device for dehumidification, the system can still obtain liquid refrigerant based on the main moisture control flow path to ensure that the dehumidification device has sufficient refrigerant supply to realize the dehumidification function based on the system's own refrigerant to meet the user's dehumidification needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic structural diagram of an optional air-conditioning system provided according to an embodiment of the present application;

[0022] Figure 2 A schematic flow chart of an optional control method for an air-conditioning system according to an embodiment of the present application;

[0023] Figure 3 A schematic flow chart of another optional control method for an air-conditioning system according to an embodiment of the present application;

[0024] Figure 4 A schematic flow chart of another optional control method for an air-conditioning system according to an embodiment of the present application;

[0025] Figure 5 A schematic flow chart of another optional control method for an air-conditioning system according to an embodiment of the present application;

[0026] Figure 6 A schematic structural diagram of an optional air conditioner provided in an embodiment of the present application.

[0027] Among them, 1. vapor-liquid separator, 2. dehumidification device, 3. steam separation humidity control solenoid valve, 4. main line humidity control solenoid valve, 5. first one-way valve, 6. refrigerant pump, 7. air supply solenoid valve, 8. compressor, 9. hot water heat exchanger, 10. electronic expansion valve, 11. evaporator, 12. second one-way valve. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In order to solve the technical problem mentioned in the background technology that the existing technology cannot use the unit to perform dehumidification control while cooling or heating, according to one aspect of the embodiments of the present application, an embodiment of an air-conditioning system is provided.

[0030] An air conditioning system, comprising: a vapor-liquid separator 1, a dehumidifying device 2, a vapor-liquid control flow path and a main humidity control flow path, wherein the vapor-liquid control flow path comprises a vapor-liquid control solenoid valve 3, and the main humidity control flow path comprises a main humidity control solenoid valve 4;

[0031] When the dehumidification function is turned on, the vapor separation humidity control flow path is used to introduce the liquid refrigerant in the vapor-liquid separator 1 into the dehumidification device 2 when the vapor separation humidity control solenoid valve 3 is opened;

[0032] When the dehumidification function is turned on, the main humidity control flow path is used to introduce liquid refrigerant flowing through the main humidity control flow path into the dehumidification device 2 when the main humidity control solenoid valve 4 is opened.

[0033] In this embodiment, the air conditioning system may specifically include three types of air conditioning systems: air-cooled, evaporative cooling, and natural cooling. For example, an air-cooled screw heating unit is a specialized device for heating and cooling in an air conditioning system and is a type of heat pump unit. In this embodiment, the on / off control of valves and other devices may be implemented by a control unit in the system. The control unit may be a control module of the air conditioning system. The valves, pumps, and other devices in the air conditioning system may be electrically connected to the control module, and the control module may be used to control the on / off status of the valves, pumps, and other devices in the air conditioning system.

[0034] Among them, the vapor-liquid separator 1 is used to separate the liquid refrigerant that may be carried in the inflowing refrigerant (coolant), thereby ensuring that only gaseous refrigerant enters the compressor 8 to avoid damage to the compressor 8. The separated liquid refrigerant can be temporarily stored at the bottom of the vapor-liquid separator 1.

[0035] The above-mentioned steam separation humidity control solenoid valve 3 serves as a control switch. In this embodiment, when the steam separation humidity control solenoid valve 3 is opened, it indicates that the liquid level of the liquid refrigerant in the vapor-liquid separator 1 exceeds the preset liquid level threshold and needs to be drained. At this time, the liquid refrigerant in the vapor-liquid separator 1 is introduced into the dehumidification device 2 based on the steam separation humidity control flow path; otherwise, there is no need to drain the vapor-liquid separator 1, and switch to the main humidity control flow path to provide the required liquid refrigerant.

[0036] The above-mentioned main humidity control solenoid valve 4 serves as a control switch. In this embodiment, when the main humidity control solenoid valve 4 is opened, it means that the liquid refrigerant required by the dehumidification device 2 may not be provided through the vapor-liquid separator 1, but is extracted from the heating circulation flow path connected to the main humidity control flow path by controlling the main humidity control flow path to be opened; if the main humidity control solenoid valve 4 is closed, it means that the liquid refrigerant required for dehumidification is provided through the vapor-liquid separator 1 at this time or the dehumidification function is in the closed state at this time.

[0037] The dehumidification device 2 is used to perform dehumidification control based on the liquid refrigerant extracted from the vapor-liquid separator 1 or the heating circulation flow path, thereby realizing the user's demand for the dehumidification function.

[0038] It should be noted that the steam-separator moisture control flow path and the main moisture control flow path can be opened either at the same time or simultaneously. When both are opened, liquid refrigerant is introduced through the steam-separator moisture control flow path for dehumidification. Alternatively, if both are opened but liquid refrigerant is not being discharged from vapor-liquid separator 1, liquid refrigerant is introduced through the main moisture control flow path for dehumidification. To close the steam-separator moisture control flow path, this is done by closing steam-separator moisture control solenoid valve 3; to close the main moisture control flow path, this is done by closing main moisture control solenoid valve 4.

[0039] In an embodiment of the present invention, when the dehumidification function of the provided air-conditioning system is turned on, when the vapor-liquid control solenoid valve 3 in the vapor-liquid control flow path is opened, it indicates that the liquid refrigerant in the vapor-liquid separator 1 needs to be discharged. Based on the vapor-liquid control flow path connecting the vapor-liquid separator 1 and the dehumidification device 2, the liquid refrigerant in the vapor-liquid separator 1 can be introduced into the dehumidification device 2, or when the main moisture control solenoid valve 4 is opened, the liquid refrigerant flowing through the main moisture control flow path will be introduced into the dehumidification device 2 through the main moisture control flow path. The introduction of the liquid refrigerant in the vapor-liquid separator 1 based on the vapor-liquid control flow path can more effectively utilize the refrigerant in the system. The dehumidification function is realized to avoid poor dehumidification efficiency of the dehumidification device 2 due to insufficient or unstable refrigerant, thereby ensuring that the dehumidification device 2 has sufficient refrigerant supply. Secondly, the liquid refrigerant in the vapor-liquid separator 1 is controlled and emptied in time to avoid liquid in the inhaled air; the dehumidification device 2 is supplied with the liquid refrigerant flowing through the main moisture control flow path for dehumidification. Even if the liquid refrigerant in the vapor-liquid separator 1 is not enough to supply the dehumidification device 2 for dehumidification, the system can still obtain liquid refrigerant based on the main moisture control flow path, ensuring that the dehumidification device 2 has sufficient refrigerant supply to realize the dehumidification function based on the system's own refrigerant to meet the user's dehumidification needs.

[0040] In some optional embodiments, combined with Figure 1 As shown, the air conditioning system further includes a first one-way valve 5, a refrigerant pump 6, an air supply solenoid valve 7 and a compressor 8;

[0041] The vapor-liquid separator 1, the vapor separation humidity control solenoid valve 3, the first one-way valve 5, the refrigerant pump 6, the dehumidification device 2, the air supply solenoid valve 7 and the compressor 8 are connected in sequence to form the vapor separation humidity control flow path;

[0042] The main humidity control solenoid valve 4, the refrigerant pump 6, the dehumidification device 2, the air supply solenoid valve 7 and the compressor 8 are connected in sequence to form the main humidity control flow path.

[0043] In this embodiment, the first one-way valve 5 is used to control the unidirectional flow of the liquid refrigerant. The refrigerant pump 6 can be used to drive the liquid refrigerant to flow in the flow path through mechanical energy to overcome pipe resistance, valve resistance, etc., to ensure that the liquid refrigerant extracted from the vapor-liquid separator 1 or the heating circulation flow path flows into the dehumidification device 2 according to the vapor separation humidity control flow path or the main humidity control flow path for dehumidification by the dehumidification device 2.

[0044] The air supply solenoid valve 7 can be used to control the opening of the air supply solenoid valve 7 when the pressure of the compressor 8 is insufficient, so that the dehumidified evaporative refrigerant generated by the operation of the fan of the dehumidification device 2 is used to supply air to the compressor 8 to increase the heat enthalpy and maintain the normal operation of the compressor 8. It is possible that the air supply solenoid valve 7 can be connected to the control system of the air conditioning system, such as a single-chip microcomputer, and automatically open or close according to preset parameters or real-time feedback signals to achieve intelligent control. The compressor 8 is used to compress the low-temperature, low-pressure gaseous refrigerant separated from the vapor-liquid separator 1, thereby increasing its temperature and pressure and converting it into a high-temperature, high-pressure gas.

[0045] In some examples, the system's control unit can open the vapor-liquid separator 1, the vapor-liquid control solenoid valve 3, the first one-way valve 5, the refrigerant pump 6, the dehumidification device 2, the air supply solenoid valve 7, and the compressor 8 to form a vapor-liquid control flow path. The vapor-liquid control flow path is: vapor-liquid separator 1 → vapor-liquid control solenoid valve 3 → the first one-way valve 5 → the refrigerant pump 6 → the dehumidification device 2 → the air supply solenoid valve 7 → the compressor 8. When the dehumidification function is turned on and the liquid level in the vapor-liquid separator 1 exceeds a preset liquid level threshold, the vapor-liquid control flow path is controlled to open, so that the liquid refrigerant in the vapor-liquid separator 1 can be extracted and drained to the dehumidification device 2. This can more effectively utilize the liquid refrigerant generated in the vapor-liquid separator 1 of the system for dehumidification, avoid poor dehumidification efficiency of the dehumidification device 2 due to insufficient or unstable refrigerant, and ensure that the dehumidification device 2 has a sufficient refrigerant supply without the need for additional dehumidification equipment.

[0046] In other examples, after the main humidity control solenoid valve 4, the refrigerant pump 6, the dehumidification device 2, the air supply solenoid valve 7 and the compressor 8 are opened and connected in sequence by the control unit of the system, a main humidity control flow path can be formed. The main humidity control flow path is: main humidity control solenoid valve 4 → refrigerant pump 6 → dehumidification device 2 → air supply solenoid valve 7 → compressor 8. When the dehumidification function is turned on and the liquid level in the vapor-liquid separator 1 does not exceed the preset liquid level threshold, the vapor-liquid control solenoid valve 3 is in a closed state, that is, the vapor-liquid control flow path is not connected. At this time, by opening the main humidity control flow path, the liquid refrigerant in the heating circulation flow path connected to the main humidity control flow path is extracted and drained to the dehumidification device 2 for dehumidification operation. Even if the liquid refrigerant in the vapor-liquid separator 1 is not enough to supply the dehumidification device 2 for dehumidification, the system can still obtain liquid refrigerant from the heating circulation flow path, which can ensure the normal operation of the dehumidification function.

[0047] In an embodiment of the present invention, when the dehumidification function is turned on, when the vapor-liquid control solenoid valve 3 in the vapor-liquid control flow path is opened, it indicates that the liquid refrigerant in the vapor-liquid separator 1 needs to be discharged. Since the vapor-liquid control flow path connects the vapor-liquid separator 1 and the dehumidification device 2, the liquid refrigerant in the vapor-liquid separator 1 can be introduced into the dehumidification device 2. The introduction of the liquid refrigerant in the vapor-liquid separator 1 can more effectively utilize the refrigerant in the system to achieve the dehumidification function, thereby avoiding poor dehumidification efficiency of the dehumidification device 2 due to insufficient or unstable refrigerant, thereby ensuring that the dehumidification device 2 has sufficient refrigerant supply. Secondly, controlling the timely emptying of the liquid refrigerant in the vapor-liquid separator 1 can avoid liquid in the air. Even if the liquid refrigerant in the vapor-liquid separator 1 is insufficient to supply the dehumidification device 2 for dehumidification, the system can still obtain liquid refrigerant from the heating circulation flow path, thereby ensuring the normal operation of the dehumidification function.

[0048] In some optional embodiments, combined with Figure 1 As shown, it also includes a hot water heat exchanger 9, an electronic expansion valve 10 and an evaporator 11. The compressor 8, hot water heat exchanger 9, electronic expansion valve 10, evaporator 11 and vapor-liquid separator 1 are connected in sequence to form the heating circulation flow path, which is used to control the heating circulation flow path to open through the system control unit during the heating process to realize the heating cycle.

[0049] In this embodiment, the hot water heat exchanger 9 is used to transfer the high-temperature, high-pressure gaseous refrigerant output by the compressor 8 through the pipe wall for heat exchange with the heating water, releasing heat to heat the water for heating purposes while simultaneously condensing it into a high-temperature, high-pressure liquid. The electronic expansion valve 10 can be used to adjust the opening of the high-temperature, high-pressure liquid refrigerant 10 after it flows out of the hot water heat exchanger 9, reducing the pressure of the liquid refrigerant and converting it into a low-temperature, low-pressure mixture of liquid and gaseous refrigerants.

[0050] The above-mentioned evaporator 11 can be an air-cooled fin evaporator, which is used for that after the low-temperature and low-pressure liquid and gaseous refrigerant mixture enters the evaporator 11 from the electronic expansion valve 10, in the evaporator, the refrigerant absorbs heat from the air, evaporates into a low-temperature and low-pressure gas and outputs it to the vapor-liquid separator 1. After the liquid refrigerant that may be carried is separated by the vapor-liquid separator 1, only the gaseous refrigerant is transported back to the compressor 8, completing a complete thermodynamic cycle. The system maintains the heating function by continuously repeating this process.

[0051] Furthermore, the system's control unit controls the compressor 8, hot water heat exchanger 9, electronic expansion valve 10, evaporator 11, and vapor-liquid separator 1 to operate and connect them, forming a heating circulation path. The heating circulation path follows the following sequence: compressor 8 → hot water heat exchanger 9 → electronic expansion valve 10 → evaporator 11 → vapor-liquid separator 1 → compressor 8. During the heating process, the heating circulation path is controlled to open, extracting gaseous refrigerant from vapor-liquid separator 1 for heating. When the system is operating, the heating circulation path can remain open, continuously heating, and meeting user heating needs. The main humidity control path is connected to the heating circulation path by connecting one end of the main humidity control solenoid valve 4 to one end of the electronic expansion valve 10. When the main humidity control path is open, liquid refrigerant is extracted from the pipeline behind the electronic expansion valve 10 in the heating circulation path, passing through the main humidity control solenoid valve 4 and the refrigerant pump 6, and then flowing into the dehumidifier 2.

[0052] In this embodiment, a heating circulation flow path is formed by connecting the compressor 8, hot water heat exchanger 9, electronic expansion valve 10, evaporator 11 and vapor-liquid separator 1 in sequence. The heating circulation flow path can be used to realize a heating cycle and provide heating function for users.

[0053] In some optional embodiments, combined with Figure 1 As shown, it also includes a second one-way valve 12. The vapor-liquid separator 1, the vapor moisture control solenoid valve 3, the first one-way valve 5, the refrigerant pump 6, the dehumidification device 2, the second one-way valve 12 and the electronic expansion valve 10 are connected in sequence to form a vapor extraction flow path. The vapor extraction flow path is used to draw the liquid refrigerant in the vapor-liquid separator 1 into the rear end flow path of the hot water heat exchanger 9 to be incorporated into the heating circulation flow path.

[0054] In this embodiment, the second one-way valve 12 is used to control the flow direction of the refrigerant. The system's control unit opens the valves and pumps in the vapor-liquid separator 1, the vapor separation humidity control solenoid valve 3, the first one-way valve 5, the refrigerant pump 6, the dehumidification device 2, the second one-way valve 12, and the electronic expansion valve 10 to establish a connection. After the connection, a vapor separation liquid extraction flow path is formed, wherein the vapor separation liquid extraction flow path is: vapor-liquid separator 1 → vapor separation humidity control solenoid valve 3 → first one-way valve 5 → refrigerant pump 6 → dehumidification device 2 → second one-way valve 12 → electronic expansion valve 10.

[0055] Furthermore, when the dehumidification function is turned off, the liquid refrigerant will not be able to completely evaporate into a gaseous state. At this time, the air supply solenoid valve 7 is in the off state, and the vapor separation moisture control flow path and the main control moisture control flow path are blocked. If the dehumidification function is turned off and the liquid level in the vapor-liquid separator 1 exceeds the preset liquid level threshold, by controlling the valves and pumps in the vapor separation liquid extraction flow path to open, based on the control of the second one-way valve 12, the liquid refrigerant in the vapor-liquid separator 1 can be directed to the electronic expansion valve 10, and then drawn into the rear end flow path of the hot water heat exchanger 9, and then merged into the heating circulation flow path.

[0056] In this embodiment, based on the vapor separation liquid extraction flow path, combined with the control of the second one-way valve 12, when the dehumidification function is turned off and the dehumidification device 2 is not working, the liquid refrigerant in the vapor-liquid separator 1 that exceeds the preset liquid level threshold can be extracted into the front-end pipeline of the electronic expansion valve 10 in the heating circulation flow path, which can not only avoid the compressor 8 from inhaling liquid, but also increase the subcooling degree before throttling.

[0057] In some embodiments, a liquid level detection device is provided in the vapor-liquid separator 1 , and the liquid level detection device is used to detect the liquid level of the liquid in the vapor-liquid separator 1 .

[0058] In this embodiment, a liquid level detection device is provided inside the vapor-liquid separator 1. The liquid level detection device includes, but is not limited to, an instrument capable of detecting the liquid level, such as a liquid level sensor. The actual liquid level of the liquid refrigerant inside the vapor-liquid separator 1 can be obtained through the liquid level detection device. Then, based on the obtained liquid level inside the vapor-liquid separator 1, it can be determined whether the liquid refrigerant in the vapor-liquid separator 1 exceeds a preset liquid level threshold, thereby determining whether it is necessary to open the vapor separation moisture control flow path to discharge the liquid refrigerant from the vapor-liquid separator 1 for dehumidification by the dehumidification device 2.

[0059] In this embodiment, a liquid level detection device is set in the vapor-liquid separator 1 to detect the liquid level height in the vapor-liquid separator 1, so as to timely obtain the actual liquid level of the liquid refrigerant in the vapor-liquid separator 1 for judgment, thereby deciding whether it is necessary to open the vapor separation moisture control flow path to discharge the liquid refrigerant from the vapor-liquid separator 1 for dehumidification by the dehumidification device 2.

[0060] According to another aspect of the embodiment of the present application, Figure 2 As shown, the present application also provides a control method for an air-conditioning system, which is applied to the air-conditioning system described in the above embodiment, and the method includes the steps of:

[0061] Step S202 : When the dehumidification function is turned on, it is detected whether the liquid level in the gas-liquid separator is higher than a preset liquid level threshold.

[0062] The preset liquid level threshold can be the maximum level of liquid refrigerant allowed in the vapor-liquid separator. When the air conditioning system is turned on and the unit is operating normally, if a user requests to activate the air conditioning system's dehumidification function, the system will receive the user's instruction and control the activation of the dehumidification function. If the liquid level in the vapor-liquid separator exceeds the preset liquid level limit, it can easily cause liquid to enter the compressor's suction air, increase the suction pressure drop, and reduce the overall energy efficiency of the unit. To address this issue, after the dehumidification function is activated, the liquid level detection device in the vapor-liquid separator can be used to monitor the liquid refrigerant level in real time or at regular intervals to read the liquid level in the vapor-liquid separator. The read liquid refrigerant level can be used to determine whether it is above the preset liquid level threshold. For example, if the liquid refrigerant level is H1 and the preset liquid level threshold is H2, and H1>H2, then the liquid refrigerant level exceeds the preset liquid level threshold; if H1≤H2, then the liquid refrigerant level does not exceed the preset liquid level threshold. By detecting the liquid level of the liquid refrigerant in the vapor-liquid separator, the liquid refrigerant in the vapor-liquid separator can be discharged accurately and timely to avoid the compressor from sucking in liquid. At the same time, the liquid refrigerant discharged from the vapor-liquid separator can be supplied to the dehumidification device for dehumidification.

[0063] Step S204: If the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold, the vapor separation and moisture control flow path is controlled to open, and the liquid refrigerant in the vapor-liquid separator is extracted and drained to the dehumidification device.

[0064] In some embodiments, if the liquid level in the vapor-liquid separator is higher than a preset liquid level threshold, the vapor separation and moisture control flow path is controlled to open. At this time, the vapor separation moisture control solenoid valve, the first one-way valve, the refrigerant pump, the dehumidification device, and the air supply solenoid valve are in the open state. The liquid refrigerant in the vapor-liquid separator that exceeds the preset liquid level threshold will be extracted and flow along the vapor separation moisture control flow path to the dehumidification device for dehumidification. This not only prevents the compressor from inhaling liquid, but also avoids poor dehumidification efficiency of the dehumidification device due to insufficient or unstable refrigerant, thereby ensuring that the dehumidification device has sufficient refrigerant supply. At the same time, the gaseous refrigerant formed in the dehumidification device will flow through the air supply solenoid valve and be provided to the compressor for air supply and enthalpy increase.

[0065] Step S206: If the liquid level in the vapor-liquid separator is lower than or equal to the preset liquid level threshold, the main humidity control flow path is controlled to open, and the liquid refrigerant in the heating circulation flow path is extracted and drained to the dehumidification device.

[0066] In some embodiments, if the liquid level in the vapor-liquid separator is lower than or equal to a preset liquid level threshold, the main humidity control flow path is controlled to open. At this time, the main humidity control solenoid valve, the refrigerant pump, the dehumidification device, and the air supply solenoid valve are in the open state. When the main humidity control solenoid valve is opened, the rear end flow path of the electronic expansion valve in the heating circulation flow path and the flow path between the main humidity control solenoid valve are connected. Therefore, after the electronic expansion valve is controlled, a portion of the liquid refrigerant flowing out to its rear end will flow through the main humidity control solenoid valve. Based on the main humidity control flow path, part of the liquid refrigerant extracted from the heating circulation flow path will flow into the dehumidification device and be used by the dehumidification device to meet the dehumidification needs in the space. At the same time, the operation of the fan of the dehumidification device will generate gaseous medium, which will flow to the compressor after the air supply solenoid valve is opened and be used to supply air to the compressor to increase enthalpy. This can prevent the compressor from inhaling liquid, increase the compressor output capacity, and improve the overall operating efficiency of the machine.

[0067] In an embodiment of the present invention, when the dehumidification function is turned on, when the liquid level exceeds a preset liquid level threshold, the liquid refrigerant in the vapor-liquid separator is extracted based on the vapor separation moisture control flow path and input into the dehumidification device. By processing the liquid refrigerant in the vapor-liquid separator whose liquid level exceeds the preset liquid level threshold, the liquid refrigerant of the system itself can be more effectively utilized for dehumidification, avoiding poor dehumidification efficiency of the dehumidification device due to insufficient or unstable refrigerant, thereby ensuring that the dehumidification device has sufficient refrigerant supply. Furthermore, when the liquid level does not exceed the preset liquid level threshold, by controlling the main moisture control flow path to be opened, liquid refrigerant is extracted from the heating circulation flow path based on the main moisture control flow path to supply the dehumidification device. Even if the liquid refrigerant in the vapor-liquid separator is insufficient to supply the dehumidification device for dehumidification, the system can still obtain liquid refrigerant from the heating circulation flow path, thereby ensuring the normal operation of the dehumidification function. In addition, when the liquid level exceeds the preset liquid level threshold, the liquid refrigerant is discharged in time, and the liquid refrigerant transported by the main moisture control flow path or the steam separation moisture control flow path is used to control the operation of the dehumidification device fan, thereby ensuring that the dehumidified evaporating refrigerant is used to replenish air and increase enthalpy in the compressor, which can avoid liquid in the compressor intake air, improve the compressor output capacity, and improve the operating efficiency of the entire machine.

[0068] In some optional embodiments, combined with Figure 3 As shown, after the above step S206, the method further includes:

[0069] Step S208, obtaining key state parameters associated with the dehumidification device after the liquid refrigerant is drained into the dehumidification device, and determining the return air superheat of the dehumidification device according to the key state parameters;

[0070] Step S210: controlling the fan frequency of the dehumidification device based on the return air superheat.

[0071] In this embodiment, after liquid refrigerant is introduced into the dehumidifier via the steam-separated humidity control flow path or the main humidity control flow path, the dehumidifier status can be monitored in real time to obtain key status parameters associated with the dehumidifier after the liquid refrigerant is introduced into the dehumidifier. The key status parameters associated with the dehumidifier may refer to parameters used for more precise dehumidification control, and may include the temperature of the liquid refrigerant in the front-end pipeline of the dehumidifier after the liquid refrigerant is introduced, the temperature inside the dehumidifier, and the temperature of the liquid refrigerant output at the back end of the dehumidifier.

[0072] Furthermore, the return air superheat of the dehumidifier can be further determined based on the key state parameters associated with the dehumidifier, and then the fan frequency of the dehumidifier can be controlled based on the return air superheat, including increasing the fan frequency, reducing the fan frequency, and maintaining the current fan frequency. Among them, the return air superheat directly reflects the dryness of the gaseous refrigerant at the outlet of the dehumidifier. By monitoring the relevant temperatures of the dehumidifier in real time and adjusting the fan frequency of the dehumidifier according to the return air superheat, the temperature of the gaseous refrigerant at the outlet of the dehumidifier can be maintained within a reasonable range, avoiding the decrease in dehumidification capacity due to superheat fluctuations, thereby improving the dehumidification efficiency. Moreover, precise control of the fan frequency can accurately control the air flow speed, and then accurately match the dehumidification demand with the energy efficiency, so that the dehumidifier is always in the best working state, thereby achieving precise control of the dehumidification process and improving the dehumidification accuracy.

[0073] In some optional embodiments, step S208 includes:

[0074] Step S2081, after the liquid refrigerant is drained into the dehumidification device, detecting the pressure in the dehumidification device;

[0075] Step S2082, determining the saturation temperature of the dehumidification device according to the pressure in the dehumidification device;

[0076] Step S2083, detecting the refrigerant temperature in the rear end flow path of the dehumidification device;

[0077] Step S2084: Subtract the refrigerant temperature from the saturation temperature to determine the return air superheat of the dehumidification device.

[0078] In this embodiment, multiple key status parameters associated with the dehumidifier include the dehumidifier's saturation temperature and the refrigerant temperature in the dehumidifier's rear-end flow path. The rear-end flow path of the dehumidifier may refer to the pipeline at the dehumidifier's output end. When the steam separation humidity control flow path or the main humidity control flow path is opened, liquid refrigerant flows into the dehumidifier, and the pressure generated in the dehumidifier can be detected, for example, using a built-in pressure sensor in the dehumidifier.

[0079] In some examples, the corresponding saturation temperature can be directly calculated based on the obtained pressure and the following formula (1) by combining the power operation of the pressure with the linear correction term.

[0080] T S =178.7×P s 0.25 -0.6×P s (1)

[0081] Among them, P s Indicates pressure value, P s The unit is MPa; T S The saturation temperature is expressed in ° C. The saturation temperature is directly calculated by raising the pressure to a power and combining it with a linear correction term.

[0082] In other examples, the corresponding saturation temperature can be calculated based on the following formula (2) according to the acquired pressure.

[0083] T S =P s 0.25 ×100(2)

[0084] Among them, P s The unit is Bar.

[0085] In other examples, the corresponding saturation temperature can also be calculated based on the obtained pressure and logarithmic operation, as shown in the following formula (3), which is suitable for high-precision calculation requirements.

[0086] T SAT =179.895+99.86L+24.38L 2 +5.6L 3 +0.935L 4 (3)

[0087] Among them, T SAT Indicates saturation temperature, L = log10 P , P is the obtained pressure value, the unit is Pa.

[0088] In other embodiments, the saturation temperature corresponding to a specific pressure can be directly queried using a refrigerant thermodynamic property table. For example, for R22 refrigerant, the saturation temperature at a pressure of 101.325 kPa is 27°C. This list is not provided here.

[0089] In this embodiment, a temperature sensor can also be used to detect the refrigerant temperature in the flow path at the rear end of the dehumidifier. The return air superheat of the dehumidifier is then calculated in combination with the calculated saturation temperature. Finally, the fan frequency of the dehumidifier is controlled based on the calculated return air superheat. Here, return air superheat = refrigerant temperature - saturation temperature.

[0090] In this embodiment, after any humidity control flow path is opened, the pressure in the dehumidification device is obtained to calculate the corresponding saturation temperature, and the refrigerant temperature in the rear end flow path of the dehumidification device is detected at the same time. The two are combined to determine the return air superheat, so that the refrigerant status at the outlet of the dehumidification device can be perceived in real time. The variable frequency control based on the return air superheat can achieve accurate matching of the fan power with the actual demand, improve the control accuracy, and avoid unnecessary energy waste.

[0091] In some optional embodiments, the above step S210 specifically includes:

[0092] S2101, comparing the return air superheat with a preset maximum return air superheat limit value and a preset minimum return air superheat limit value;

[0093] S2102, if the return air superheat is greater than or equal to the preset maximum return air superheat limit value, controlling the fan frequency of the dehumidification device to decrease;

[0094] S2103, if the return air superheat is less than the preset maximum return air superheat limit value and greater than the preset minimum return air superheat limit value, controlling the fan frequency of the dehumidification device to maintain the current state;

[0095] If the return air superheat is less than or equal to the preset minimum return air superheat limit value, the fan frequency of the dehumidification device is controlled to increase.

[0096] In some embodiments, the preset maximum return gas superheat limit and the preset minimum return gas superheat limit can be pre-set based on the evaporation temperature of the liquid in the hot water heat exchanger and / or the refrigerant type. For example, when setting based on the refrigerant type, the return gas superheat of R410A refrigerant is generally 2-3°C higher than that of R22 refrigerant. In this embodiment, the preset maximum return gas superheat limit = return gas superheat limit T + return gas superheat tolerance m; the preset minimum return gas superheat limit = return gas superheat limit T - return gas superheat tolerance m. The return gas superheat limit is generally set to 3-5°C to control compressor air supply; m is the return gas superheat tolerance, generally set to 0.1≤m≤1 to prevent frequent fan adjustment.

[0097] Further, combined with Figure 4As shown, the return air superheat T1 is compared with T+m and Tm, where T+m represents the preset maximum return air superheat limit and Tm represents the preset minimum return air superheat limit. When T1 ≥ T+m, the return air superheat is high, indicating that the refrigerant temperature at the dehumidifier outlet is far above its saturation temperature, possibly indicating a low load. For example, if the indoor temperature is close to the set value, the return air superheat may decrease dehumidification efficiency and prevent moisture from condensing completely. This can be addressed by controlling the fan frequency. This frequency reduction reduces the air flow rate and the air flow rate per unit time, extending the evaporation time of the refrigerant, improving dehumidification efficiency, and reducing energy losses. When T+m > T1 > Tm, the dehumidifier is in a stable control state and matches the load demand. No adjustment of the return air superheat is required, and the dehumidifier fan maintains its current frequency. When T1≤Tm, it proves that the evaporation is insufficient and the dehumidification efficiency in the space is low. At the same time, the compressor's air supply efficiency is poor and cannot meet the load's demand for dehumidification. To this end, the fan frequency can be controlled to speed up the air flow rate and increase the air flow per unit time, thereby quickly meeting the dehumidification needs in the space.

[0098] In this embodiment, by comparing the calculated return air superheat with the preset maximum return air superheat limit value and the preset minimum return air superheat limit value, the extension frequency in the dehumidification device is adjusted promptly and accurately according to the comparison result, which is more conducive to achieving a high degree of matching with the dehumidification demand and meeting the load demand.

[0099] In some optional embodiments, the method further includes:

[0100] When it is detected during operation that the dehumidification function is turned off and the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold, the vapor separation moisture control solenoid valve, the first one-way valve, the refrigerant pump and the second refrigerant pump are controlled to open, and the liquid refrigerant in the vapor-liquid separator is pumped into the rear end flow path of the hot water heat exchanger and merged into the heating circulation flow path;

[0101] When it is detected during operation that the dehumidification function is turned off and the liquid level in the vapor-liquid separator is lower than or equal to the preset liquid level threshold, the vapor separation humidity control solenoid valve, the main line humidity control solenoid valve, the first one-way valve, the refrigerant pump, the dehumidification device and the air supply solenoid valve are controlled to be closed.

[0102] In some embodiments, during the operation of the system, the on or off status of the dehumidification function can be monitored. When it is detected that the dehumidification function is turned off during operation, the dehumidification device, refrigerant pump, and other valves in the steam separation moisture control flow path and the main moisture control flow path in the system are all in the closed state. At this time, the air-conditioning system provides heating based on the heating circulation flow path. If the liquid level in the gas-liquid separator is still higher than the preset liquid level threshold in this case, it is necessary to open the steam separation moisture control solenoid valve, the first one-way valve, the refrigerant pump and the second refrigerant pump. By utilizing the power of the refrigerant pump, the liquid refrigerant in the gas-liquid separator is pumped into the rear end flow path of the hot water heat exchanger, so that the extracted liquid refrigerant is incorporated into the heating circulation flow path to increase the pre-throttling subcooling degree.

[0103] In other embodiments, if the steam-separator humidity control circuit or the main humidity control circuit is enabled, but during operation, it is detected that the dehumidification function is disabled and the liquid level in the vapor-liquid separator is below or equal to a preset liquid level threshold, it indicates that neither dehumidification nor liquid refrigerant discharge from the vapor-liquid separator is currently required. In response, the steam-separator humidity control solenoid valve, the main humidity control solenoid valve, the first one-way valve, the refrigerant pump, the dehumidification device, and the air supply solenoid valve are controlled to be closed, that is, all components in the humidity control circuit are kept closed, and only the heating circulation circuit needs to be maintained for heating.

[0104] In this embodiment, by monitoring the on / off status of the dehumidification function and the liquid level in the gas-liquid separator during operation in real time, when it is detected that the dehumidification function is turned off, the devices in the humidity control flow path can be controlled in time in combination with the liquid level in the gas-liquid separator, and the liquid refrigerant in the gas-liquid separator is pumped into the rear end flow path of the hot water heat exchanger and incorporated into the heating circulation flow path, which can avoid the compressor from sucking liquid into the air and can increase the subcooling degree before throttling.

[0105] In some optional embodiments, the method further includes:

[0106] When the dehumidification function and the steam separation humidity control flow path are turned on, or when the dehumidification function and the main humidity control flow path are turned on, continuously detecting whether the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold;

[0107] If the liquid level in the vapor-liquid separator is lower than the preset liquid level threshold when the dehumidification function and the vapor separation moisture control flow path are turned on, the vapor separation moisture control flow path is controlled to be closed and the main moisture control flow path is turned on;

[0108] If the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold when the dehumidification function and the main moisture control flow path are turned on, the main moisture control flow path is controlled to be closed and the vapor separation moisture control flow path is turned on.

[0109] In this embodiment, combined with Figure 5 As shown, during system operation, when the dehumidification function is turned on and any humidity control flow path is open, the liquid level in the vapor-liquid separator can be continuously monitored. If the dehumidification function and the vapor control flow path are turned on, and the liquid level in the vapor-liquid separator is detected to be lower than the preset liquid level threshold, it means that the vapor-liquid separator does not need to discharge the liquid refrigerant at this time, and the suction will not carry liquid. If the vapor control flow path continues to be opened, it will cause the liquid refrigerant in the gas-liquid separator to be too low. In this case, the vapor control solenoid valve is closed and the main control solenoid valve is opened, thereby controlling the vapor control flow path to be closed and switching to the main control flow path to be opened. Then, by extracting part of the liquid refrigerant in the heating circulation flow path connected to the main control flow path, it is supplied to the dehumidification device for dehumidification.

[0110] Furthermore, if the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold when the dehumidification function and the main humidity control flow path are turned on, it means that not only the dehumidification demand must be met, but also the liquid refrigerant needs to be discharged from the vapor-liquid separator to avoid liquid inhalation by the compressor. In response to this, the vapor-liquid control solenoid valve is opened and the main humidity control solenoid valve is turned off, thereby controlling the main humidity control flow path to be closed and switching to the vapor-liquid control flow path to be opened, extracting the liquid refrigerant from the vapor-liquid separator to meet the dehumidification demand in the space. At the same time, the vapor-liquid separator is controlled to discharge the liquid refrigerant and the dehumidification device fan is controlled to operate to ensure that the dehumidified evaporating refrigerant is used to replenish air and increase enthalpy in the compressor. This can avoid liquid inhalation by the compressor, increase the compressor output capacity, and improve the overall operating efficiency of the machine.

[0111] According to another aspect of the embodiment of the present application, the present application provides an air conditioner, such as Figure 6 As shown, it includes a memory 601, a processor 603, a communication interface 605 and a communication bus 607. The memory 601 stores a computer program that can be run on the processor 603. The memory 601 and the processor 603 communicate through the communication interface 605 and the communication bus 607. When the processor 603 executes the computer program, the steps of the control method of the above-mentioned air-conditioning system are implemented.

[0112] The memory 601 and processor 603 in the air conditioner communicate via a communication bus 607 and a communication interface 605. The communication bus 607 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 607 may be divided into an address bus, a data bus, a control bus, and the like.

[0113] The memory 601 may include a random access memory (RAM) or a non-volatile memory, such as at least one disk storage. Alternatively, the memory may be at least one storage device located away from the processor.

[0114] The above-mentioned processor 603 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can 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, and discrete hardware components.

[0115] According to another aspect of the embodiments of the present application, a computer program product or computer program is provided. The computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the steps of the air conditioning system control method described in any of the above embodiments.

[0116] Optionally, in an embodiment of the present application, the computer-readable medium is configured to store program codes for the processor to execute the following steps:

[0117] Step S202: When the dehumidification function is turned on, detecting whether the liquid level in the gas-liquid separator is higher than a preset liquid level threshold;

[0118] Step S204: If the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold, the vapor separation and humidity control flow path is controlled to open, and the liquid refrigerant in the vapor-liquid separator is extracted and drained to the dehumidification device;

[0119] Step S206: If the liquid level in the vapor-liquid separator is lower than or equal to the preset liquid level threshold, the main humidity control flow path is controlled to open, and the liquid refrigerant in the heating circulation flow path is extracted and drained to the dehumidification device.

[0120] Optionally, the specific examples in this embodiment can refer to the examples described in the above embodiments, and this embodiment will not be repeated here. In addition, when the embodiment of this application is specifically implemented, the above embodiments can be referred to, and corresponding technical effects can be achieved.

[0121] It is understood that the embodiments described herein may be implemented using hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit may be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or a combination thereof.

[0122] For software implementation, the technology described herein can be implemented by a unit that performs the functions described herein. The software code can be stored in a memory and executed by a processor. The memory 601 can be implemented in the processor 603 or outside the processor 603.

[0123] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0124] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0125] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0126] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0127] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0128] It should be noted that, in this document, relational terms such as first, second, etc. are used only 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 terms include, comprise, or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the phrase "including a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0129] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An air conditioning system, characterized in that: The air conditioning system includes: a vapor-liquid separator, a dehumidification device, a vapor-liquid control flow path and a main flow control flow path, wherein the vapor-liquid control flow path includes a vapor-liquid control solenoid valve, and the main flow control flow path includes a main flow control solenoid valve; When the dehumidification function is turned on, the vapor separation humidity control flow path is used to introduce the liquid refrigerant in the vapor-liquid separator into the dehumidification device when the vapor separation humidity control solenoid valve is opened; When the dehumidification function is turned on, the main humidity control flow path is used to introduce liquid refrigerant flowing through the main humidity control flow path into the dehumidification device when the main humidity control solenoid valve is opened.

2. The system according to claim 1, wherein: The air conditioning system further includes a first one-way valve, a refrigerant pump, an air supply solenoid valve and a compressor; The vapor-liquid separator, the vapor-humidity control solenoid valve, the first one-way valve, the refrigerant pump, the dehumidification device, the air supply solenoid valve and the compressor are connected in sequence to form the vapor-humidity control flow path; The main humidity control solenoid valve, refrigerant pump, dehumidification device, air supply solenoid valve and compressor are connected in sequence to form the main humidity control flow path.

3. The system according to claim 2, characterized in that It also includes a hot water heat exchanger, an electronic expansion valve and an evaporator. The compressor, hot water heat exchanger, electronic expansion valve, evaporator and vapor-liquid separator are connected in sequence to form a heating circulation flow path, which is used to control the opening of the heating circulation flow path through the system control unit during the heating process to realize the heating cycle.

4. The system according to claim 3, characterized in that It also includes a second one-way valve. The vapor-liquid separator, vapor moisture control solenoid valve, first one-way valve, refrigerant pump, dehumidification device, second one-way valve and electronic expansion valve are connected in sequence to form a vapor extraction flow path. The vapor extraction flow path is used to draw the liquid refrigerant in the vapor-liquid separator into the rear end flow path of the hot water heat exchanger to be merged into the heating circulation flow path.

5. The system according to any one of claims 1 to 4, characterized in that The vapor-liquid separator is provided with a liquid level detection device, and the liquid level detection device is used to detect the liquid level of the liquid in the vapor-liquid separator.

6. A method for controlling an air conditioning system, characterized in that: Applied to the air conditioning system according to any one of claims 1 to 5, the method comprises the steps of: When the dehumidification function is turned on, the liquid level in the gas-liquid separator is detected to see if it is higher than the preset liquid level threshold; If the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold, the vapor separation and moisture control flow path is controlled to open, and the liquid refrigerant in the vapor-liquid separator is extracted and drained to the dehumidification device; If the liquid level in the vapor-liquid separator is lower than or equal to the preset liquid level threshold, the main humidity control flow path is controlled to open, and the liquid refrigerant in the heating circulation flow path is extracted and drained to the dehumidification device.

7. The control method of the air conditioning system according to claim 6, characterized in that: After extracting the liquid refrigerant from the vapor-liquid separator and draining it to the dehumidification device and / or extracting the liquid refrigerant from the heating circulation path and draining it to the dehumidification device, the method further includes: obtaining key state parameters associated with the dehumidification device after the liquid refrigerant is drained into the dehumidification device, and determining the return air superheat of the dehumidification device according to the key state parameters; The fan frequency of the dehumidification device is controlled based on the return air superheat.

8. The control method of the air conditioning system according to claim 7, characterized in that: The key state parameters include the saturation temperature of the dehumidification device and the refrigerant temperature in the rear end flow path of the dehumidification device. The step of obtaining the key state parameters associated with the dehumidification device after the liquid refrigerant is drained into the dehumidification device and determining the return air superheat of the dehumidification device based on the key state parameters includes: After the liquid refrigerant flows into the dehumidification device, detecting the pressure in the dehumidification device; determining the saturation temperature of the dehumidification device based on the pressure in the dehumidification device; detecting the refrigerant temperature in the rear end flow path of the dehumidification device; The return air superheat degree of the dehumidification device is determined by subtracting the refrigerant temperature from the saturation temperature.

9. The control method of the air conditioning system according to claim 7, characterized in that: The controlling of the fan frequency of the dehumidification device based on the return air superheat comprises: Comparing the return air superheat with a preset maximum return air superheat limit value and a preset minimum return air superheat limit value; If the return air superheat is greater than or equal to the preset maximum return air superheat limit value, controlling the fan frequency of the dehumidification device to decrease; If the return air superheat is less than the preset maximum return air superheat limit value and greater than the preset minimum return air superheat limit value, controlling the fan frequency of the dehumidification device to maintain the current state; If the return air superheat is less than or equal to the preset minimum return air superheat limit value, the fan frequency of the dehumidification device is controlled to increase.

10. The control method of the air conditioning system according to claim 6, characterized in that: The method further comprises: During operation, if it is detected that the dehumidification function is turned off and the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold, the vapor separation moisture control solenoid valve, the first one-way valve, the refrigerant pump and the second refrigerant pump are controlled to open, and the liquid refrigerant in the vapor-liquid separator is pumped into the rear end flow path of the hot water heat exchanger and merged into the heating circulation flow path; When it is detected during operation that the dehumidification function is turned off and the liquid level in the vapor-liquid separator is lower than or equal to the preset liquid level threshold, the vapor separation humidity control solenoid valve, the main line humidity control solenoid valve, the first one-way valve, the refrigerant pump, the dehumidification device and the air supply solenoid valve are controlled to be closed.

11. The control method of the air conditioning system according to claim 6, characterized in that: The method further comprises: When the dehumidification function and the steam separation humidity control flow path are turned on, or when the dehumidification function and the main humidity control flow path are turned on, continuously detecting whether the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold; If the liquid level in the vapor-liquid separator is lower than the preset liquid level threshold when the dehumidification function and the vapor separation moisture control flow path are turned on, the vapor separation moisture control flow path is controlled to be closed and the main moisture control flow path is turned on; If the liquid level in the vapor-liquid separator is higher than the preset liquid level threshold when the dehumidification function and the main moisture control flow path are turned on, the main moisture control flow path is controlled to be closed and the vapor separation moisture control flow path is turned on.

12. An air conditioner comprising a memory, a processor, a communication interface, and a communication bus, wherein the memory stores a computer program that can be run on the processor, and the memory and the processor communicate via the communication bus and the communication interface, wherein: When the processor executes the computer program, the control method of the air-conditioning system according to any one of claims 6 to 10 is implemented.

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