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

Abstract

The present disclosure relates to an air-conditioning system, a control method for the air-conditioning system, and a computer-readable storage medium. The air-conditioning system comprises: a refrigerant circulation loop, the refrigerant circulation loop comprising a compressor (1), a water-cooled heat exchanger (2), and an indoor unit (3) connected in sequence; a water immersion sensor group (8), arranged on the refrigerant circulation loop and located between an air intake of the compressor (1) and the water-cooled heat exchanger (2), and configured to send a water immersion signal when the refrigerant is immersed in water; a first emergency valve (51), arranged at the air intake of the compressor (1), and configured to restrict water-containing refrigerant from entering the compressor (1) when disconnected; and a processor (4), signal-connected to both the water immersion sensor group (8) and the first emergency valve (51), and configured to disconnect the first emergency valve (51) when the water immersion sensor group (8) sends a water immersion signal.

Description

Technical Field

[0001] The present disclosure relates to the field of air conditioning, and in particular to an air conditioning system, a control method for the air conditioning system, and a computer-readable storage medium. Background Art

[0002] The water source multi-split system combines water source heat pump technology with the air source multi-split system. The cold and hot source sides are the same as the water source heat pump system, using water as the energy transport medium. The indoor side is the same as the multi-split system, using refrigerant as the energy transport medium. It has the advantages of high energy efficiency and sustainable heating. Summary of the Invention

[0003] After research, the inventors found that the water-cooled heat exchanger of the water-source multi-split system in the related technology is often damaged as factors such as pressure and temperature change, causing water to enter the air-conditioning system and mix with the refrigerant. When it is sucked into the compressor, it causes liquid hammer and other phenomena, damaging the compressor or the entire air-conditioning system. The maintenance cost is huge, time-consuming and complicated.

[0004] In view of this, embodiments of the present disclosure provide an air-conditioning system, a control method for the air-conditioning system, and a computer-readable storage medium, which can minimize the risk of water entering the air-conditioning system and causing damage to the air-conditioning system.

[0005] In one aspect of the present disclosure, there is provided an air conditioning system, comprising:

[0006] A refrigerant circulation circuit, which includes a compressor, a water-cooled heat exchanger, and an indoor unit connected in sequence;

[0007] A water immersion sensor group is provided on the refrigerant circulation loop and is located between the air suction port of the compressor and the water-cooled heat exchanger, and is configured to send a water immersion signal when it is immersed in water;

[0008] a first emergency valve, disposed at the suction port of the compressor, configured to restrict the entry of water-containing refrigerant into the compressor when disconnected; and

[0009] The processor is signal-connected to the water sensor group and the first emergency valve, and is configured to disconnect the first emergency valve when the water sensor group sends a water immersion signal.

[0010] In some embodiments, the refrigerant circulation loop further comprises:

[0011] A four-way valve is connected to the compressor and the water-cooled heat exchanger respectively, and the four-way valve has a first state and a second state;

[0012] Among them, in the first state of the four-way valve, the refrigerant circulation loop is switched to the refrigeration circulation loop, and the refrigerant flows from the exhaust port of the compressor through the water-cooled heat exchanger, then enters the indoor unit, and finally returns to the suction port of the compressor;

[0013] In the second state of the four-way valve, the refrigerant circulation loop is switched to the heating circulation loop, and the refrigerant flows from the exhaust port of the compressor through the indoor unit, then enters the water-cooled heat exchanger, and finally returns to the suction port of the compressor.

[0014] In some embodiments, the refrigerant circulation loop further comprises:

[0015] A gas-liquid separator is connected to the air suction port of the compressor and the four-way valve;

[0016] Wherein, the first emergency valve is connected between the air outlet of the gas-liquid separator and the air intake of the compressor.

[0017] In some embodiments, the water sensor group includes:

[0018] A first water immersion sensor is provided between the indoor unit and the water-cooled heat exchanger; and

[0019] a second water immersion sensor, disposed between the four-way valve and the air inlet of the gas-liquid separator;

[0020] The processor is configured as follows:

[0021] When both the first water immersion sensor and the second water immersion sensor send out water immersion signals, the compressor is shut down and the first emergency valve is disconnected.

[0022] In some embodiments, it further includes:

[0023] The second emergency valve is provided between the water-cooled heat exchanger and the four-way valve and is connected to the processor signal;

[0024] The processor is configured as follows:

[0025] The compressor is shut down and the first emergency valve is disconnected, and then the second emergency valve is disconnected after a first preset time delay.

[0026] In some embodiments, it further includes:

[0027] a first pressure sensor, disposed between the exhaust port of the compressor and the four-way valve, and configured to detect a first pressure of the refrigerant in the exhaust pipe of the compressor;

[0028] The processor is connected to the first pressure sensor signal and is configured to:

[0029] When the first water sensor or the second water sensor sends a water immersion signal, determining a maximum value and a minimum value of a first pressure of the refrigerant in the exhaust pipe of the compressor within a second preset time period;

[0030] determining a maximum value of a first saturation temperature corresponding to a maximum value of a first pressure of the refrigerant and a minimum value of the first saturation temperature corresponding to a minimum value of the first pressure of the refrigerant;

[0031] determining a difference between a maximum value of the first saturation temperature and a minimum value of the first saturation temperature;

[0032] The first emergency valve and the second emergency valve are switched on and off according to a magnitude relationship between a first saturation temperature difference between a maximum value and a minimum value of a first saturation temperature of the refrigerant within a second preset time period and a first preset temperature threshold.

[0033] In some embodiments, it further includes:

[0034] a temperature sensor, disposed at the exhaust port of the gas-liquid separator, configured to detect the temperature of the refrigerant at the steam separation pipe at the exhaust port of the gas-liquid separator;

[0035] a second pressure sensor disposed at an inlet of the gas-liquid separator and configured to detect a second pressure of the refrigerant at the inlet of the gas-liquid separator;

[0036] The processor is signal-connected to the temperature sensor and the second pressure sensor, and is configured as follows:

[0037] When the first saturation temperature difference is greater than a first preset temperature threshold, determining a second saturation temperature corresponding to a second pressure;

[0038] The first emergency valve and the second emergency valve are switched on and off according to the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold.

[0039] In some embodiments, the processor is further configured to:

[0040] When the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is greater than the second preset temperature threshold, the compressor is turned off and the first emergency valve is disconnected, and then the second emergency valve is disconnected after a first preset time delay.

[0041] In some embodiments, the processor is further configured to:

[0042] When the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to the second preset temperature threshold, the first emergency valve and the second emergency valve are maintained in the open state.

[0043] In some embodiments, the processor is further configured to:

[0044] When the first saturation temperature difference is less than or equal to the first preset temperature threshold, the first emergency valve and the second emergency valve are maintained in an open state.

[0045] In some embodiments, it further includes:

[0046] The water cooling circulation loop is connected to the water cooling heat exchanger through a quick connector.

[0047] In some embodiments, the refrigerant circulation loop further comprises:

[0048] The liquid storage tank is arranged between the water-cooled heat exchanger and the indoor unit and is configured to store water overflowing from the pipeline.

[0049] In some embodiments, the indoor unit includes:

[0050] The throttling unit and the evaporator are connected in series.

[0051] In some embodiments, the water-cooled heat exchanger is a plate heat exchanger.

[0052] In some embodiments, the air conditioning system is a water source multi-split system.

[0053] In some embodiments, the first preset duration is 5 seconds.

[0054] In some embodiments, the first preset temperature threshold is 2°C to 5°C.

[0055] In some embodiments, the second preset temperature threshold is 0°C to 1°C.

[0056] In another aspect of the present disclosure, a control method for an air-conditioning system as described above is provided, comprising:

[0057] Acquire water immersion information of the first water immersion sensor and water immersion information of the second water immersion sensor;

[0058] When both the first water immersion sensor and the second water immersion sensor send out water immersion signals, the compressor is turned off and the first emergency valve is disconnected, and then the second emergency valve is disconnected after a first preset time delay.

[0059] In some embodiments, the air conditioning system includes:

[0060] a first pressure sensor, disposed between the exhaust port of the compressor and the four-way valve, and configured to detect a first pressure of the refrigerant in the exhaust pipe of the compressor;

[0061] The control method of the air-conditioning system further includes:

[0062] When the first water immersion sensor or the second water immersion sensor sends a water immersion signal, obtaining a maximum value and a minimum value of a first pressure of the refrigerant in the exhaust pipe of the compressor within a second preset time period;

[0063] determining a maximum value of a first saturation temperature corresponding to a maximum value of a first pressure of the refrigerant and a minimum value of the first saturation temperature corresponding to a minimum value of the first pressure of the refrigerant;

[0064] determining a difference between a maximum value of the first saturation temperature and a minimum value of the first saturation temperature;

[0065] The first emergency valve and the second emergency valve are switched on and off according to a magnitude relationship between a first saturation temperature difference between a maximum value and a minimum value of a first saturation temperature of the refrigerant within a second preset time period and a first preset temperature threshold.

[0066] In some embodiments, the air conditioning system further comprises:

[0067] a temperature sensor, disposed at the exhaust port of the gas-liquid separator, configured to detect the temperature of the refrigerant at the steam separation pipe at the exhaust port of the gas-liquid separator;

[0068] a second pressure sensor disposed at an inlet of the gas-liquid separator and configured to detect a second pressure of the refrigerant at the inlet of the gas-liquid separator;

[0069] The operation of switching the opening and closing of the first emergency valve and the second emergency valve according to the relationship between the first saturation temperature difference between the maximum value and the minimum value of the first saturation temperature of the refrigerant within the second preset time period and the first preset temperature threshold specifically includes:

[0070] If the first saturation temperature difference is greater than a first preset temperature threshold, determining a second saturation temperature corresponding to the second pressure;

[0071] The first emergency valve and the second emergency valve are switched on and off according to the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold.

[0072] In some embodiments, the operation of switching the first emergency valve and the second emergency valve open and closed, based on the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold, specifically includes:

[0073] If the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is greater than a second preset temperature threshold, the compressor is shut down and the first emergency valve is disconnected, and then the second emergency valve is disconnected after a first preset time delay.

[0074] In some embodiments, the operation of switching the first emergency valve and the second emergency valve on and off further includes:

[0075] If the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to the second preset temperature threshold, the first emergency valve and the second emergency valve are maintained in the open state.

[0076] In some embodiments, the operation of switching the first emergency valve and the second emergency valve open and closed further includes:

[0077] If the first saturation temperature difference of the refrigerant is less than or equal to the first preset temperature threshold, the first emergency valve and the second emergency valve are maintained in the open state.

[0078] In another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the method for controlling the air-conditioning system as described above is implemented.

[0079] Therefore, according to the embodiment of the present disclosure, a water immersion sensor group is set on the refrigerant circulation loop to monitor the water outlet situation on the refrigerant circulation loop, and a first emergency valve is set to control the on and off of the refrigerant circulation loop, so that when the refrigerant is flooded due to reasons such as water leakage in the water-cooled heat exchanger, the first emergency valve can be cut off in time to prevent water from further spreading to the entire air-conditioning system and causing a series of faults such as liquid hammer caused by the mixing of water and refrigerant and being sucked into the compressor, thereby effectively ensuring the safety and reliability of the air-conditioning system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0081] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0082] Figure 1 is a schematic structural diagram of some embodiments of the air-conditioning system according to the present disclosure;

[0083] Figure 2 is a connection diagram of some embodiments of the air conditioning system according to the present disclosure;

[0084] Figure 3 is a schematic structural diagram of a refrigeration cycle according to some embodiments of the air-conditioning system of the present disclosure;

[0085] Figure 4 is a schematic structural diagram of a heating cycle according to some embodiments of the air-conditioning system of the present disclosure;

[0086] Figure 5 is a flow chart of some embodiments of the control method of the air-conditioning system according to the present disclosure.

[0087] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0088] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0089] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0090] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0091] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0092] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0093] The water-source multi-split unit in the related art uses a water-cooled heat exchanger to exchange heat between the refrigerant and water. During operation, due to the influence of pressure and temperature, especially in a low-temperature heating environment, the water-cooled heat exchanger is often damaged, such as freezing and cracking, causing water to enter the air-conditioning system and mix with the refrigerant. When it is sucked into the compressor, it causes liquid hammer and other phenomena, damaging the compressor or the entire air-conditioning system. The maintenance cost is huge, time-consuming and complicated.

[0094] In view of this, one aspect of the present disclosure provides an air conditioning system. Figure 1 is a schematic structural diagram of some embodiments of the air-conditioning system according to the present disclosure, Figure 2 is a connection diagram of some embodiments of the air conditioning system according to the present disclosure, with reference to Figure 1 and Figure 2 The air conditioning system includes: a refrigerant circulation loop, a water immersion sensor group 8, a first emergency valve 51 and a processor 4.

[0095] The refrigerant circulation loop includes a compressor 1, a water-cooled heat exchanger 2, and an indoor unit 3, all connected in sequence. A water sensor assembly 8 is provided within the refrigerant circulation loop, located between the air intake of compressor 1 and the water-cooled heat exchanger 2. It is configured to issue a water immersion signal when flooded. A first emergency valve 51 is provided at the air intake of compressor 1 and, when disconnected, is configured to restrict the entry of water-containing refrigerant into compressor 1. The processor 4 is signal-connected to both the water sensor assembly 8 and the first emergency valve 15 and is configured to disconnect the first emergency valve assembly 51 when the water sensor assembly 8 issues a water immersion signal.

[0096] The water-cooled heat exchanger 2 includes, but is not limited to, a plate-type heat exchanger. It can be connected to the refrigerant circulation loop via a quick connector 2, allowing for timely disassembly and maintenance. The water immersion sensor assembly 8 utilizes the principle of liquid conductivity for detection. Normally, the two-pole probes are insulated between the air and the refrigerant. When the water immersion sensor assembly 8 is immersed in water in the refrigerant, the two-pole probes conduct, sending a water immersion signal to the processor 4.

[0097] In this embodiment, a water immersion sensor group 8 is set on the refrigerant circulation loop to monitor the water outlet situation on the refrigerant circulation loop, and a first emergency valve 51 is set to control the on-off of the refrigerant circulation loop, so that when the refrigerant is flooded due to reasons such as water leakage in the water-cooled heat exchanger 2, the first emergency valve 51 can be cut off in time to prevent water from further spreading to the entire air-conditioning system and causing a series of faults such as liquid hammer caused by the mixing of water and refrigerant and being sucked into the compressor, thereby effectively ensuring the safety and reliability of the air-conditioning system operation.

[0098] Figure 3 is a schematic structural diagram of a refrigeration cycle according to some embodiments of the air-conditioning system of the present disclosure, Figure 4 is a schematic structural diagram of a heating cycle according to some embodiments of the air-conditioning system disclosed herein. Figure 3 and Figure 4 The arrow in the figure indicates the flow direction of the refrigerant. Figure 3 and Figure 4 In some embodiments, the refrigerant circulation circuit further includes: a four-way valve 6, which is connected to the compressor 1 and the water-cooled heat exchanger 2 respectively, and the four-way valve 6 has a first state and a second state.

[0099] In the first state of the four-way valve 6, the refrigerant circulation circuit switches to the cooling circulation circuit, and the refrigerant flows from the exhaust port of the compressor 1 through the water-cooled heat exchanger 2, then enters the indoor unit 3, and finally returns to the air intake of the compressor 1. In the second state of the four-way valve 6, the refrigerant circulation circuit switches to the heating circulation circuit, and the refrigerant flows from the exhaust port of the compressor 1 through the indoor unit 3, then enters the water-cooled heat exchanger 2, and finally returns to the air intake of the compressor 1.

[0100] In this embodiment, the air-conditioning system can be switched between cooling and heating modes by setting a four-way valve 6. The water immersion in the refrigerant circulation loop can be monitored in different heating modes, and the first emergency valve 51 can be disconnected in time when water immersion occurs to prevent further spread of water.

[0101] refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, the refrigerant circulation circuit further includes: a gas-liquid separator 7 connected to the air intake of the compressor 1 and the four-way valve 6. A first emergency valve 51 is connected between the air outlet of the gas-liquid separator 7 and the air intake of the compressor 1.

[0102] In this embodiment, by connecting the first emergency valve 51 between the exhaust port of the gas-liquid separator 7 and the air intake port of the compressor 1, water can be prevented from entering the compressor 1 in both the cooling mode and the heating mode of the air-conditioning system, thereby avoiding a series of faults such as liquid hammer caused by the mixture of water and refrigerant being sucked into the compressor, which is beneficial to improving the safety of the compressor and the maintenance efficiency of the air-conditioning system.

[0103] refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, the water sensor group 8 includes a first water sensor 81 and a second water sensor 82. The first water sensor 81 is disposed between the indoor unit 3 and the water-cooled heat exchanger 2, and the second water sensor 82 is disposed between the four-way valve 6 and the air inlet of the gas-liquid separator 7. The processor 4 is configured to shut down the compressor 1 and open the first emergency valve 51 when both the first water sensor 81 and the second water sensor 82 emit water signals.

[0104] In this embodiment, the first water sensor 81 can be disposed between the indoor unit 3 and the water-cooled heat exchanger 2, and the second water sensor 82 can be disposed between the four-way valve 6 and the air inlet of the gas-liquid separator 7. This allows comprehensive and reliable monitoring of water immersion conditions at various locations in the refrigerant circulation loop. When both the first water sensor 81 and the second water sensor 82 emit water immersion signals, the compressor 1 is shut down and the connection to the first emergency valve 51 is severed. This allows timely detection of damage to the water-cooled heat exchanger 2, effectively preventing water from entering the compressor 1 and the entire air-conditioning system, minimizing the risk of damage to the air-conditioning system. Furthermore, the accuracy of identifying water immersion can be improved to avoid misjudgments.

[0105] refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, the air conditioning system further includes a second emergency valve 52, which is disposed between the water-cooled heat exchanger 2 and the four-way valve 6. This valve can prevent high-pressure protection and refrigerant backflow when the second emergency valve 52 is disconnected. The second emergency valve 52 is signal-connected to the processor 4. The processor 4 is configured to shut down the compressor 1 and disconnect the first emergency valve 51 when both the first water sensor 81 and the second water sensor 82 emit water immersion signals. The processor 4 is then configured to disconnect the second emergency valve 52 after a first preset time delay. Alternatively, the compressor 1 is shut down and the first and second emergency valves 51, 52 are disconnected simultaneously. The first preset time can be set to 5 seconds.

[0106] In this embodiment, a second emergency valve 52 can also be provided. When the first water immersion sensor 81 and the second water immersion sensor 82 both send water immersion signals, the first emergency valve 51 and the second emergency valve 52 are closed successively, thereby forming an effective buffer to avoid the sudden shutdown of the air-conditioning unit, resulting in refrigerant high-pressure shock and high-pressure protection.

[0107] refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, the air-conditioning system further includes: a first pressure sensor 91 , which is arranged between the exhaust port of the compressor 1 and the four-way valve 6 , and is configured to detect a first pressure of the refrigerant in the exhaust pipe of the compressor 1 .

[0108] The processor 4 is connected to the signal of the first pressure sensor 91 and is configured to: when the first water immersion sensor 81 or the second water immersion sensor 82 sends a water immersion signal, determine the maximum and minimum values ​​of the first pressure of the refrigerant in the exhaust pipe of the compressor 1 within a second preset time period, and then determine the maximum value of the first saturation temperature corresponding to the maximum value of the first pressure of the refrigerant and the minimum value of the first saturation temperature corresponding to the minimum value of the first pressure of the refrigerant.

[0109] Then, the difference between the maximum value of the first saturation temperature and the minimum value of the first saturation temperature is determined, and the opening and closing of the first emergency valve 51 and the second emergency valve 52 are switched according to the relationship between the first saturation temperature difference between the maximum value and the minimum value of the first saturation temperature of the refrigerant within the second preset time period and the first preset temperature threshold.

[0110] The first pressure is the high pressure of the refrigerant in the air conditioning system. The first preset temperature threshold may be 2-5°C, and the second preset time may be 40 seconds.

[0111] In this embodiment, when only one water immersion sensor sends a water immersion signal, in order to prevent false alarms, the air-conditioning system parameters such as the high-pressure pressure fluctuation value of the refrigerant within the second preset time period can be combined to comprehensively judge the water immersion condition of the air-conditioning system, thereby improving the accuracy of water immersion monitoring.

[0112] refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, the air conditioning system further includes a temperature sensor 92 and a second pressure sensor 93. The temperature sensor 92 is disposed at the exhaust port of the gas-liquid separator 7 and is configured to detect the temperature of the refrigerant at the steam outlet pipe of the exhaust port of the gas-liquid separator 7. The second pressure sensor 93 is disposed at the inlet of the gas-liquid separator 7 and is configured to detect a second pressure of the refrigerant at the inlet of the gas-liquid separator 7.

[0113] Processor 4 is signal-connected to both temperature sensor 92 and second pressure sensor 93 and is configured to determine a second saturation temperature corresponding to the second pressure when the first saturation temperature difference exceeds a first preset temperature threshold. Processor 4 then switches the first emergency valve 51 and second emergency valve 52 open and closed based on the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold. The second preset temperature threshold can be 0°C to 1°C, and the second saturation temperature is the low-pressure temperature of the refrigerant.

[0114] In this embodiment, when the first saturation temperature difference of the refrigerant within the second preset time period is greater than the first preset temperature threshold, the difference between the vapor outlet pipe temperature of the refrigerant and the second saturation temperature is used to determine whether the unit has severe liquid backflow. When the unit has severe liquid backflow, the refrigerant circulation loop of the air-conditioning system has entered water. At this time, the first emergency valve group 51 and the second emergency valve 51 are promptly cut off and the compressor 1 is shut down to prevent further diffusion of water in the refrigerant circulation loop.

[0115] In some embodiments, the processor 4 is further configured to shut down the compressor 1, open the first emergency valve 51, and then open the second emergency valve 52 after a first preset time delay when the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is greater than a second preset temperature threshold. Alternatively, the processor 4 is configured to simultaneously open the first and second emergency valves 51, 52 when shutting down the compressor 1.

[0116] In this embodiment, if the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is greater than the second preset temperature threshold, it indicates that the unit has experienced serious liquid backflow. Therefore, the first emergency valve 51 and the second emergency valve 52 can be cut off and the compressor 1 can be shut down to prevent water from further spreading in the refrigerant circulation loop.

[0117] In some embodiments, processor 4 is further configured to maintain first emergency valve 51 and second emergency valve 52 in an open state when the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to a second preset temperature threshold. In this embodiment, if the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to the second preset temperature threshold, the air conditioning system can maintain normal operation.

[0118] In some embodiments, the processor 4 is further configured to maintain the first emergency valve 51 and the second emergency valve 52 in an open state when the first saturation temperature difference is less than or equal to a first preset temperature threshold. In this embodiment, if the first saturation temperature difference of the refrigerant is less than or equal to the first preset temperature threshold, the air conditioning system can maintain normal operation.

[0119] refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, the air conditioning system further includes a water-cooling circulation loop 10 connected to the water-cooled heat exchanger 2 via a quick connector 12. The water source circulation loop includes a water source, a water pump, a flow control valve, a water inlet sensor, and a water outlet sensor. The water inlet temperature sensor and the water outlet temperature sensor are respectively provided at both ends of the water-cooled heat exchanger 2.

[0120] In this embodiment, the quick connector 12 is used to facilitate rapid disassembly and replacement. When the emergency valve group 5 is cut off from the refrigerant pipeline, and when the refrigerant is between the first emergency valve 51 and the second emergency valve 51 and has not entered the compressor 1, no refrigerant will flow out during the replacement of the water-cooled heat exchanger 2, and there is no need to replace the refrigerant, which can improve the convenience and economy of maintenance.

[0121] refer to Figure 1 、 Figure 3 and Figure 4 In some embodiments, the refrigerant circulation circuit further includes a liquid storage tank 11, which is disposed between the water-cooled heat exchanger 2 and the indoor unit 3 and is configured to store water overflowing from the pipeline. In this embodiment, the liquid storage tank 11 not only regulates the amount of circulating refrigerant but also acts as a buffer to prevent water from entering the compressor 1 too quickly.

[0122] refer to Figure 1 、 Figure 3 and Figure 4In some embodiments, the indoor unit 3 includes: a throttling unit and an evaporator connected in series. The air conditioning system also includes: a first refrigerant temperature sensor and a second refrigerant temperature sensor, disposed in the refrigerant circulation loop, respectively located at both ends of the water-cooled heat exchanger 2; a heating electronic expansion valve, disposed between the first water immersion sensor 81 and the liquid storage tank 11; an oil-liquid separator, disposed between the compressor 1 and the four-way valve 6; a high-pressure switch, disposed between the compressor 1 and the oil-liquid separator; a compressor exhaust temperature sensor, disposed at the exhaust port of the compressor 1; an oil return solenoid valve, disposed in parallel with the compressor 1; and a vapor separator inlet pipe temperature sensor, disposed at the inlet of the gas-liquid separator 7, to detect the temperature of the refrigerant at the inlet of the gas-liquid separator 7.

[0123] In some embodiments, the water-cooled heat exchanger 2 is a plate heat exchanger, and the air-conditioning system is a water source multi-split system.

[0124] In some embodiments, the first preset time length is 5 seconds. In this embodiment, the first preset time length can be adjusted in actual use according to the parameters of the air conditioning system.

[0125] In some embodiments, the first preset temperature threshold is 2° C. to 5° C. In this embodiment, the first preset temperature threshold can be adjusted in actual use according to parameters of the air-conditioning system.

[0126] In some embodiments, the second preset temperature threshold is 0° C. to 1° C. In this embodiment, the second preset temperature threshold can be adjusted in actual use according to parameters of the air-conditioning system.

[0127] Figure 5 is a flow chart of some embodiments of the control method of the air conditioning system according to the present disclosure, with reference to Figure 5 In another aspect of the embodiments of the present disclosure, a control method for an air-conditioning system as described above is provided, comprising: steps S1 to S2.

[0128] In step S1, water immersion information of the first water immersion sensor 81 and water immersion information of the second water immersion sensor 82 are obtained;

[0129] In step S2, when both the first water sensor 81 and the second water sensor 82 send water flooding signals, the compressor 1 is shut down, the first emergency valve 51 is opened, and then the second emergency valve 52 is opened after a first preset delay. Alternatively, the first emergency valve 51 and the second emergency valve 52 are opened simultaneously when the compressor 1 is shut down.

[0130] In this embodiment, when the first water immersion sensor 81 and the second water immersion sensor 82 both send water immersion signals, the connection of the first emergency valve 51 is cut off, which can not only timely detect the damage of the water-cooled heat exchanger 2 and effectively prevent water from entering the entire air-conditioning system, but also improve the accuracy of identifying the occurrence of water immersion and avoid misjudgment.

[0131] In some embodiments, the refrigerant circulation circuit further includes: a first pressure sensor 91 , which is disposed between the exhaust port of the compressor 1 and the four-way valve 6 and is configured to detect a first pressure of the refrigerant in the exhaust pipe of the compressor 1 .

[0132] The control method of the air conditioning system further includes:

[0133] When the first water immersion sensor 81 or the second water immersion sensor 82 sends a water immersion signal, the maximum and minimum values ​​of the first pressure of the refrigerant in the exhaust pipe of the compressor 1 within the second preset time period are obtained; the maximum value of the first saturation temperature corresponding to the maximum value of the first pressure of the refrigerant and the minimum value of the first saturation temperature corresponding to the minimum value of the first pressure of the refrigerant are determined; the difference between the maximum value of the first saturation temperature and the minimum value of the first saturation temperature is determined; and the opening and closing of the first emergency valve 51 and the second emergency valve 52 are switched according to the relationship between the first saturation temperature difference between the maximum value and the minimum value of the first saturation temperature of the refrigerant within the second preset time period and the first preset temperature threshold.

[0134] In this embodiment, when only one water immersion sensor sends a water immersion signal, in order to prevent false alarms, the air-conditioning system's water immersion condition can be comprehensively judged in combination with air-conditioning system parameters such as the high-pressure fluctuation difference of the refrigerant, thereby improving the accuracy of water immersion monitoring.

[0135] In some embodiments, the air-conditioning system further includes: a temperature sensor 92, which is arranged at the exhaust port of the gas-liquid separator 7 and is configured to detect the vapor outlet pipe temperature of the refrigerant on the outlet pipe of the gas-liquid separator 7; a second pressure sensor 93, which is arranged at the air inlet of the gas-liquid separator 7 and is configured to detect the second pressure of the refrigerant on the air inlet pipe of the gas-liquid separator 7.

[0136] According to the relationship between the first saturation temperature difference between the maximum and minimum values ​​of the first saturation temperature of the refrigerant within the second preset time period and the first preset temperature threshold, the operation of switching the opening and closing of the first emergency valve 51 and the second emergency valve 52 specifically includes: if the first saturation temperature difference is greater than the first preset temperature threshold, determining the second saturation temperature corresponding to the second pressure; according to the relationship between the difference between the vapor outlet pipe temperature of the refrigerant and the second saturation temperature and the second preset temperature threshold, switching the opening and closing of the first emergency valve 51 and the second emergency valve 52.

[0137] In this embodiment, when the first saturation temperature difference of the refrigerant within the second preset time period is greater than the first preset temperature threshold, the difference between the vapor outlet pipe temperature of the refrigerant and the second saturation temperature value is used to determine whether the unit has severe liquid backflow. When the unit has severe liquid backflow, the refrigerant circulation loop of the air-conditioning system has entered water. At this time, the first emergency valve 51 and the second emergency valve 52 are cut off to prevent further diffusion of water in the refrigerant circulation loop.

[0138] In some embodiments, the operation of switching the opening and closing of the first emergency valve 51 and the second emergency valve 52 based on the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and a second preset temperature threshold specifically includes: if the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is greater than the second preset temperature threshold, shutting down the compressor 1 and opening the first emergency valve 51, and then opening the second emergency valve 52 after a first preset delay. Alternatively, the first emergency valve 51 and the second emergency valve 52 are simultaneously opened when shutting down the compressor 1.

[0139] In this embodiment, if the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature value is greater than the second preset temperature threshold, it means that the unit has experienced serious liquid backflow. Therefore, the first emergency valve 51 and the second emergency valve 52 can be cut off to prevent water from further spreading in the refrigerant circulation loop.

[0140] In some embodiments, switching the opening and closing of the first emergency valve 51 and the second emergency valve 52 based on the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and a second preset temperature threshold further includes maintaining the first emergency valve 51 and the second emergency valve 52 in an open state if the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to the second preset temperature threshold. In this embodiment, if the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to the second preset temperature threshold, the air conditioning system can maintain normal operation.

[0141] In some embodiments, based on the relationship between the first saturation temperature difference between the maximum and minimum values ​​of the first saturation temperature of the refrigerant within the second preset time period and the first preset temperature threshold, the operation of switching the opening and closing of the first emergency valve 51 and the second emergency valve 52 also includes: if the first saturation temperature difference of the refrigerant is less than or equal to the first preset temperature threshold, the first emergency valve 51 and the second emergency valve 52 are maintained in an open state.

[0142] In some embodiments, the control method of the air-conditioning system also includes: before the water immersion monitoring is operated, the heating and cooling modes of the air-conditioning system are identified and distinguished, so as to set different parameters according to different modes, such as the first preset temperature threshold, the second preset temperature threshold and the second preset time, etc.

[0143] In another aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by the processor 4, the control method of the air-conditioning system as described above is implemented.

[0144] In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, including any media that facilitates the transfer of a computer program from one location to another. A storage medium may be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is also properly referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwaves, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwaves are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks typically reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0145] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0146] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An air conditioning system, characterized in that: include: A refrigerant circulation circuit, the refrigerant circulation circuit comprising a compressor (1), a four-way valve (6), a water-cooled heat exchanger (2), and an indoor unit (3) connected in sequence; A water immersion sensor group (8) is arranged on the refrigerant circulation loop and located between the air intake of the compressor (1) and the water-cooled heat exchanger (2), and is configured to send a water immersion signal when it is immersed in water; a first emergency valve (51), provided at the air intake of the compressor (1), and configured to restrict the entry of water-containing refrigerant into the compressor (1) when disconnected; a second emergency valve (52) disposed between the water-cooled heat exchanger (2) and the four-way valve (6); a first pressure sensor (91), disposed between the exhaust port of the compressor (1) and the four-way valve (6), and configured to detect a first pressure of the refrigerant in the exhaust pipe of the compressor (1); and a processor (4) connected to the water immersion sensor group (8), the first emergency valve (51), the second emergency valve (52), and the first pressure sensor (91), and configured to disconnect the first emergency valve (51) when the water immersion sensor group (8) sends a water immersion signal; The processor is further configured to: When the water immersion sensor group (8) sends a water immersion signal, determining a maximum value and a minimum value of a first pressure of the refrigerant in the exhaust pipe of the compressor (1) within a second preset time period; determining a maximum value of a first saturation temperature corresponding to a maximum value of a first pressure of the refrigerant and a minimum value of the first saturation temperature corresponding to a minimum value of the first pressure of the refrigerant; determining a difference between a maximum value of the first saturation temperature and a minimum value of the first saturation temperature; The first emergency valve (51) and the second emergency valve (52) are switched on and off according to a magnitude relationship between a first saturation temperature difference between a maximum value and a minimum value of a first saturation temperature of the refrigerant within a second preset time period and a first preset temperature threshold.

2. The air conditioning system according to claim 1, wherein: The four-way valve (6) has a first state and a second state; Wherein, in the first state of the four-way valve (6), the refrigerant circulation circuit is switched to a refrigeration circulation circuit, and the refrigerant flows from the exhaust port of the compressor (1) through the water-cooled heat exchanger (2), then enters the indoor unit (3), and finally returns to the intake port of the compressor (1); In the second state of the four-way valve (6), the refrigerant circulation circuit is switched to a heating circulation circuit, and the refrigerant flows from the exhaust port of the compressor (1) through the indoor unit (3), then enters the water-cooled heat exchanger (2), and finally returns to the intake port of the compressor (1).

3. The air conditioning system according to claim 2, wherein: The refrigerant circulation circuit also includes: A gas-liquid separator (7) is connected to the air intake of the compressor (1) and the four-way valve (6); The first emergency valve (51) is connected between the gas outlet of the gas-liquid separator (7) and the gas intake of the compressor (1).

4. The air conditioning system according to claim 3, wherein: The water immersion sensor group (8) comprises: a first water immersion sensor (81) disposed between the indoor unit (3) and the water-cooled heat exchanger (2); and a second water immersion sensor (82) disposed between the four-way valve (6) and the air inlet of the gas-liquid separator (7); Wherein, the processor (4) is configured to: When both the first water immersion sensor (81) and the second water immersion sensor (82) send water immersion signals, the compressor (1) is shut down and the first emergency valve (51) is disconnected.

5. The air conditioning system according to claim 4, wherein: The processor (4) is configured to: The compressor (1) is shut down and the first emergency valve (51) is disconnected, and then the second emergency valve (52) is disconnected after a first preset time delay.

6. The air conditioning system according to claim 4, wherein: Also includes: a temperature sensor (92), disposed at the exhaust port of the gas-liquid separator (7), and configured to detect the temperature of the refrigerant at the steam separation outlet pipe of the exhaust port of the gas-liquid separator (7); a second pressure sensor (93), disposed at the inlet of the gas-liquid separator (7), and configured to detect a second pressure of the refrigerant at the inlet of the gas-liquid separator (7); The processor (4) is signal-connected to both the temperature sensor (92) and the second pressure sensor (93), and is configured to: When the first saturation temperature difference is greater than a first preset temperature threshold, determining a second saturation temperature corresponding to the second pressure; The first emergency valve (51) and the second emergency valve (52) are switched on and off according to the magnitude relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold.

7. The air conditioning system according to claim 6, wherein: The processor (4) is further configured to: When the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is greater than a second preset temperature threshold, the compressor (1) is shut down and the first emergency valve (51) is disconnected, and then the second emergency valve (52) is disconnected after a first preset time delay.

8. The air conditioning system according to claim 6, wherein: The processor (4) is further configured to: When the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to a second preset temperature threshold, the first emergency valve (51) and the second emergency valve (52) are maintained in an open state.

9. The air conditioning system according to claim 5, wherein: The processor (4) is further configured to: When the first saturation temperature difference is less than or equal to a first preset temperature threshold, the first emergency valve (51) and the second emergency valve (52) are maintained in an open state.

10. The air conditioning system according to claim 5 or 7, characterized in that: The first preset time length is 5 seconds.

11. The air conditioning system according to claim 1, 6 or 9, characterized in that: The first preset temperature threshold is 2°C~5°C.

12. The air conditioning system according to claim 6, 7 or 8, characterized in that: The second preset temperature threshold is 0°C~1°C.

13. The air conditioning system according to claim 1, wherein: Also includes: The water-cooling circulation loop (10) is connected to the water-cooling heat exchanger (2) via a quick connector (12).

14. The air conditioning system according to claim 1, wherein: The refrigerant circulation loop further includes: A liquid storage tank (11) is provided between the water-cooled heat exchanger (2) and the indoor unit (3) and is configured to store water overflowing from the pipeline.

15. The air conditioning system according to claim 1, wherein: The indoor unit (3) comprises: The throttling unit and the evaporator are connected in series.

16. The air conditioning system according to claim 1, wherein: The water-cooled heat exchanger (2) is a plate-type heat exchanger.

17. The air conditioning system according to claim 1, wherein: The air conditioning system is a water source multi-connected system.

18. A method for controlling an air conditioning system according to any one of claims 4 to 10, characterized in that: include: Acquiring water immersion information from the first water immersion sensor (81) and water immersion information from the second water immersion sensor (82); When both the first water immersion sensor (81) and the second water immersion sensor (82) send water immersion signals, the compressor (1) is shut down and the first emergency valve (51) is disconnected, and then the second emergency valve (52) is disconnected after a first preset time delay.

19. The control method of the air conditioning system according to claim 18, wherein: The air conditioning system comprises: a first pressure sensor (91), disposed between the exhaust port of the compressor (1) and the four-way valve (6), and configured to detect a first pressure of the refrigerant in the exhaust pipe of the compressor (1); The control method of the air-conditioning system further includes: When the first water immersion sensor (81) or the second water immersion sensor (82) sends a water immersion signal, obtaining a maximum value and a minimum value of a first pressure of the refrigerant on the exhaust pipe of the compressor (1) within a second preset time period; determining a maximum value of a first saturation temperature corresponding to a maximum value of a first pressure of the refrigerant and a minimum value of the first saturation temperature corresponding to a minimum value of the first pressure of the refrigerant; determining a difference between a maximum value of the first saturation temperature and a minimum value of the first saturation temperature; The first emergency valve (51) and the second emergency valve (52) are switched on and off according to a magnitude relationship between a first saturation temperature difference between a maximum value and a minimum value of a first saturation temperature of the refrigerant within a second preset time period and a first preset temperature threshold.

20. The control method of the air conditioning system according to claim 19, wherein: The air conditioning system further comprises: a temperature sensor (92), disposed at the exhaust port of the gas-liquid separator (7), and configured to detect the temperature of the refrigerant at the steam separation outlet pipe of the exhaust port of the gas-liquid separator (7); a second pressure sensor (93), disposed at the inlet of the gas-liquid separator (7), and configured to detect a second pressure of the refrigerant at the inlet of the gas-liquid separator (7); The operation of switching the first emergency valve (51) and the second emergency valve (52) on and off according to the magnitude relationship between the first saturation temperature difference between the maximum value and the minimum value of the first saturation temperature of the refrigerant within the second preset time period and the first preset temperature threshold specifically includes: If the first saturation temperature difference is greater than a first preset temperature threshold, determining a second saturation temperature corresponding to the second pressure; The first emergency valve (51) and the second emergency valve (52) are switched on and off according to the magnitude relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold.

21. The control method of the air conditioning system according to claim 20, wherein: According to the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold, the operation of switching the first emergency valve (51) and the second emergency valve (52) open and closed specifically includes: If the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is greater than a second preset temperature threshold, the compressor (1) is shut down and the first emergency valve (51) is disconnected, and then the second emergency valve (52) is disconnected after a first preset time delay.

22. The control method of the air conditioning system according to claim 20, wherein: According to the relationship between the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature and the second preset temperature threshold, the operation of switching the first emergency valve (51) and the second emergency valve (52) on and off further includes: If the difference between the refrigerant vapor outlet pipe temperature and the second saturation temperature is less than or equal to a second preset temperature threshold, the first emergency valve (51) and the second emergency valve (52) are maintained in an open state.

23. The control method of the air conditioning system according to claim 19, wherein: According to the magnitude relationship between the first saturation temperature difference between the maximum value and the minimum value of the first saturation temperature of the refrigerant within the second preset time period and the first preset temperature threshold, the operation of switching the first emergency valve (51) and the second emergency valve (52) on and off further includes: If the first saturation temperature difference of the refrigerant is less than or equal to a first preset temperature threshold, the first emergency valve (51) and the second emergency valve (52) are maintained in an open state.

24. A computer-readable storage medium, characterized in that A computer program is stored thereon, wherein when the program is executed by the processor (4), the control method of the air-conditioning system as claimed in any one of claims 18 to 23 is implemented.

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