Water source air conditioning system and control method

Abstract

The present application discloses a water source air conditioning system and a control method, which relate to the field of air conditioning technology and are used to reduce the risk of compressor damage. The water source air conditioning system has a cooling mode and a heating mode. The water source air conditioning system includes a compressor, a first heat exchanger, a second heat exchanger, a variable flow valve, a subcooler, and a controller. The compressor includes an air intake port and an exhaust port. The first heat exchanger includes a refrigerant channel and a hot medium channel, one end of the refrigerant channel is connected to the air intake port, and the other end is connected to the exhaust port. One end of the hot medium channel is connected to a water supply pipe, and the other end is connected to a water outlet pipe. The second heat exchanger is connected in series between the compressor and the first heat exchanger. The variable flow valve is provided on the water supply pipe. The subcooler is connected in series between the compressor and the refrigerant channel. The controller is electrically connected to the variable flow valve. The present application is used to adjust the temperature.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a water source air conditioning system and a control method thereof. Background Art

[0002] With the development of the economy and society, air conditioners can provide people with a better experience, so they are increasingly used in various places such as entertainment, home and work. Especially when the outdoor temperature is too high or too low (for example, in hot summer weather or cold winter weather), air conditioners have become an indispensable electrical appliance.

[0003] In related technologies, a water-source air conditioning system includes a compressor, a first heat exchanger, and a second heat exchanger. The first heat exchanger includes a refrigerant channel and a heat medium channel. The refrigerant channel includes a first refrigerant port and a second refrigerant port. The heat medium channel includes a water inlet and a water outlet. The water inlet is connected to a water supply pipe, and the water outlet is connected to a water outlet pipe. Compared to air-source air conditioning systems, water-source air conditioning systems offer higher energy efficiency, require less floor space, have lower operating noise and vibration, and offer more stable and superior performance.

[0004] However, when the heat exchange capacity of the second heat exchanger is small, the constant water inlet volume will cause the refrigerant in the first heat exchanger to release or absorb more heat, resulting in a low exhaust pressure value in the compressor (the working mode of the water source air-conditioning system is cooling mode) or a high suction pressure value (the working mode of the water source air-conditioning system is heating mode), thereby causing unit protection or even compressor damage. Summary of the Invention

[0005] Embodiments of the present disclosure provide a water source air conditioning system and a control method for reducing the risk of compressor damage.

[0006] To achieve the above objectives, the embodiments of the present disclosure adopt the following technical solutions:

[0007] In a first aspect, an embodiment of the present disclosure provides a water source air conditioning system, which includes a compressor, a first heat exchanger, a second heat exchanger, a variable flow valve, a subcooler, and a controller. The compressor includes an air intake port and an air exhaust port. The first heat exchanger includes a refrigerant channel and a hot medium channel, one end of the refrigerant channel is connected to the air intake port, and the other end is connected to the air exhaust port. One end of the hot medium channel is connected to a water supply pipe, and the other end is connected to a water outlet pipe. The second heat exchanger is connected in series between the compressor and the first heat exchanger. The variable flow valve is provided on the water supply pipe. The subcooler is connected in series between the compressor and the refrigerant channel. The controller is electrically connected to the variable flow valve, and the controller is configured to:

[0008] Obtain the working mode of the water source air conditioning system, the water temperature value of the water supply pipe, the pressure value of the exhaust port or the pressure value of the air intake port;

[0009] Determining an initial opening of the variable flow valve according to an operating mode of the water source air conditioning system and a water temperature value of the water supply pipe so that the heat exchange in the first heat exchanger matches the heat exchange in the second heat exchanger;

[0010] In cooling mode, the operating opening of the variable flow valve is adjusted according to the pressure value of the exhaust port so that the heat exchange in the first heat exchanger matches the heat exchange in the second heat exchanger;

[0011] In the heating mode, the operating opening of the variable flow valve is adjusted according to the pressure value of the air intake, the refrigerant temperature value at the outlet of the subcooler and the water temperature value of the water supply pipe, so that the heat absorption in the first heat exchanger matches the heat release in the second heat exchanger.

[0012] The water-source air conditioning system provided by the embodiments of the present disclosure provides at least the following beneficial effects: the initial opening of the variable flow valve is determined based on the operating mode of the water-source air conditioning system and the water temperature of the water supply pipe. Thus, when the water-source air conditioning system begins operation, the heat exchange rate of the refrigerant in the first heat exchanger matches the heat exchange rate of the refrigerant in the second heat exchanger, ensuring that the ratio of the compressor's discharge pressure to the intake pressure is within a normal range, thereby reducing the risk of compressor shutdown or damage. When the water-source air conditioning system is operating in cooling mode, the controller adjusts the operating opening of the variable flow valve based on the discharge pressure. Thus, throughout operation, the heat release of the refrigerant in the first heat exchanger matches the heat absorption of the refrigerant in the second heat exchanger, ensuring that the ratio of the compressor's discharge pressure to the intake pressure is within a normal range, thereby reducing the risk of compressor shutdown or damage. When the water-source air conditioning system is operating in heating mode, the controller adjusts the operating opening of the variable flow valve based on the intake pressure, the refrigerant temperature at the outlet of the subcooler, and the water temperature of the water supply pipe. In this way, throughout the entire operating process, the heat absorbed by the refrigerant in the first heat exchanger matches the heat released by the refrigerant in the second heat exchanger, so that the ratio of the compressor's exhaust pressure value to the intake pressure value is within a normal ratio range, thereby reducing the risk of compressor shutdown or damage. Thus, the control method for a water-source air conditioning system provided in an embodiment of the present application can ensure that the ratio of the compressor's exhaust pressure value to the intake pressure value is within a normal ratio range, thereby reducing the risk of compressor shutdown or damage.

[0013] In some embodiments, the operating opening of the variable flow valve is determined based on the operating mode of the water source air conditioning system and the water temperature of the water supply pipe. Specifically, the following steps are performed: Determine the operating mode of the water source air conditioning system. In cooling mode, the initial opening is determined based on the water temperature of the water supply pipe and a first mapping relationship, where the first mapping relationship includes multiple temperature intervals and an initial opening corresponding to each temperature interval. In heating mode, the initial opening is determined based on the water temperature of the water supply pipe and a second mapping relationship, where the second mapping relationship includes multiple temperature intervals and an initial opening corresponding to each temperature interval.

[0014] In some embodiments, the variable flow valve's operating opening is adjusted based on the exhaust port's pressure value. Specifically, the following steps are performed: obtaining a first pressure value at the exhaust port at a first moment and a second pressure value at a second moment, the second moment being after the first moment. Determining whether the second pressure value is less than or equal to a first pressure threshold, where the first pressure threshold is the minimum safe pressure value for the exhaust port. If so, reducing the variable flow valve's operating opening. If not, determining whether the second pressure value is less than or equal to the first pressure value, and whether a first difference between the second pressure value and the first pressure threshold is less than or equal to the second pressure threshold. If so, reducing the variable flow valve's operating opening. If not, determining whether a second difference between the second pressure value and the first pressure value is greater than or equal to the second pressure threshold, and whether a third difference between the third pressure threshold and the second pressure value is less than or equal to a fourth pressure threshold, where the third pressure threshold is the maximum safe pressure value for the exhaust port. If the second difference is greater than or equal to the second pressure threshold, and the third difference is less than or equal to the fourth pressure threshold, increasing the variable flow valve's operating opening. If the second difference is less than the second pressure threshold, and / or the third difference is greater than the fourth pressure threshold, a determination is made as to whether the second pressure value is greater than or equal to the third pressure threshold. If the second pressure value is greater than or equal to the third pressure threshold, the variable flow valve opening is increased. If the second pressure value is less than the third pressure threshold, the current variable flow valve opening is maintained.

[0015] In some embodiments, the variable flow valve opening is adjusted based on the intake pressure, the refrigerant temperature at the subcooler outlet, and the water temperature in the water supply pipe. Specifically, the following steps are performed: obtaining a third intake pressure, a first subcooler outlet temperature, and a second water supply pipe temperature. Determining whether the third pressure is greater than or equal to a fifth pressure threshold, where the fifth pressure threshold is the maximum safe pressure value for the intake port. If so, reducing the variable flow valve opening. If the third pressure is less than the fifth pressure threshold, determining whether a third difference between the fifth pressure threshold and the third pressure is less than or equal to a second pressure threshold, and whether the first temperature is greater than or equal to a second temperature value. If the third difference is less than or equal to the second pressure threshold, and the first temperature is greater than or equal to the second temperature value, reducing the variable flow valve opening. If not, determining whether a fourth difference between the third pressure and a sixth pressure threshold is less than or equal to the third pressure threshold, and whether the first temperature is less than or equal to a fifth difference between the second temperature and the first temperature threshold. Where the sixth pressure threshold is the minimum safe pressure value for the intake port. If the fourth difference is less than or equal to the third pressure threshold, and the first temperature value is less than or equal to the fifth difference, the variable flow valve opening is increased. If the fourth difference is greater than the third pressure threshold, and / or the first temperature value is greater than the ground error value, a determination is made as to whether the third pressure value is less than or equal to a sixth pressure threshold. If the third pressure value is less than or equal to the sixth pressure threshold, the variable flow valve opening is increased. If the third pressure value is greater than the sixth pressure threshold, the current variable flow valve opening is maintained.

[0016] In some embodiments, the water-source air conditioning system further includes a four-way reversing valve and an expansion valve. The four-way reversing valve has a first inlet, a first outlet, a first reversing port, and a second reversing port. The first inlet is connected to the exhaust port, the first outlet is connected to the intake port, the first reversing port is connected to the refrigerant channel, and the second reversing port is connected to the second heat exchanger. One end of the expansion valve is connected to the subcooler, and the other end is connected to the second heat exchanger.

[0017] In some embodiments, the water source air conditioning system also includes a variable frequency water pump, which is arranged on the water supply pipe and connected to the controller. The controller is also configured to adjust the speed of the variable frequency water pump according to the opening of the variable flow valve.

[0018] In some embodiments, the water source air conditioning system further includes an alarm device, which is connected to the controller. The controller is further configured to control the alarm device to alarm when the flow in the variable flow valve is less than a preset flow.

[0019] In some embodiments, when the water source air conditioning system includes a four-way reversing valve, the water source air conditioning system further includes an oil separator, and the oil separator is connected in series between the compressor and the four-way reversing valve.

[0020] In some embodiments, the water source air conditioning system further includes a lubricating oil recovery loop, one end of which is connected to the oil separator and the other end of which is connected to the compressor.

[0021] In a second aspect, an embodiment of the present application provides a method for controlling a water source air conditioning system, the method comprising: obtaining an operating mode of the water source air conditioning system, a water temperature value of a water supply pipe, a pressure value of an exhaust port, or a pressure value of an air intake port. Determine the initial opening of the variable flow valve based on the operating mode of the water source air conditioning system and the water temperature value of the water supply pipe. In cooling mode, adjust the operating opening of the variable flow valve based on the pressure value of the exhaust port. In heating mode, adjust the operating opening of the variable flow valve based on the pressure value of the air intake port, the refrigerant temperature value of the outlet of the subcooler, and the water temperature value of the water supply pipe.

[0022] In a third aspect, an embodiment of the present application provides a controller comprising: one or more processors; one or more memories; wherein the one or more memories are used to store computer program codes, the computer program codes comprising computer instructions, and when the one or more processors execute the computer instructions, the controller executes any one of the water source air conditioning system control methods provided in the second aspect.

[0023] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which includes computer instructions. When the computer instructions are executed on a computer, the computer executes any one of the water source air conditioning system control methods provided in the second aspect.

[0024] In the fifth aspect, an embodiment of the present invention provides a computer program product, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement any water source air-conditioning system control method provided in the second aspect.

[0025] It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer-readable storage medium may be packaged together with the processor of the controller or separately from the processor of the controller, and this application does not limit this.

[0026] The beneficial effects described in the second to fifth aspects of this application can be analyzed by referring to the beneficial effects of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below should be considered schematic diagrams and are not intended to limit the actual dimensions of the products involved in the embodiments of the present disclosure.

[0028] Figure 1 A structural diagram of a water source air conditioning system provided for some embodiments of the present disclosure;

[0029] Figure 2 Another structural diagram of a water source air conditioning system provided for some embodiments of the present disclosure;

[0030] Figure 3 A corresponding relationship diagram between the opening degree and gear position of a variable flow valve provided in some embodiments of the present disclosure;

[0031] Figure 4 A hardware configuration block diagram of a water source air conditioning system provided for some embodiments of the present disclosure;

[0032] Figure 5 A flow chart of a control method for a water source air conditioning system provided in some embodiments of the present disclosure;

[0033] Figure 6 Another flow chart of a method for controlling a water source air conditioning system provided by some embodiments of the present disclosure;

[0034] Figure 7 A corresponding relationship diagram between temperature ranges and variable flow valves provided in some embodiments of the present disclosure;

[0035] Figure 8 Another corresponding relationship diagram between temperature ranges and variable flow valves provided for some embodiments of the present disclosure;

[0036] Figure 9 Another flow chart of a method for controlling a water source air conditioning system according to some embodiments of the present disclosure;

[0037] Figure 10 Another flow chart of a method for controlling a water source air conditioning system according to some embodiments of the present disclosure;

[0038] Figure 11 Another flow chart of a method for controlling a water source air conditioning system provided in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0040] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as having an open, inclusive meaning, that is, "including, but not limited to." In the description of the specification, the terms "one embodiment," "some embodiments," "exemplary," or "such as" are intended to indicate that specific features, structures, materials, or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0041] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this disclosure, unless otherwise specified, "plurality" means two or more.

[0042] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, or electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0043] The use of "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0044] Some embodiments of the present disclosure provide a water source air conditioning system 100, such as Figure 1 As shown, the water source air conditioning system 100 includes a compressor 10 , a four-way reversing valve 20 , a first heat exchanger 30 , a subcooler 40 , an expansion valve 50 and a second heat exchanger 60 .

[0045] like Figure 1As shown, the compressor 10 includes an air intake 11 and an air discharge 12. A low-temperature, low-pressure gaseous refrigerant enters the compressor 10 through the air intake 11 and is compressed in the compressor 10 to form a high-temperature, high-pressure gaseous refrigerant, which is then discharged from the air discharge 12.

[0046] The four-way reversing valve 20 includes a first inlet 21, a first outlet 22, a first reversing port 23, and a second reversing port 24. The first inlet 21 is connected to the exhaust port 12, and the first outlet 22 is connected to the intake port 11.

[0047] The first heat exchanger 30 includes a refrigerant channel 31 and a heat medium channel 32. The refrigerant channel 31 includes a first refrigerant port 311 and a second refrigerant port 312, while the heat medium channel 32 includes a water inlet 321 and a water outlet 322. The first refrigerant port 311 communicates with the first reversing port 23, while the second refrigerant port 312 communicates with the second reversing port 24. One end of the heat medium channel 32 communicates with the water supply pipe, and the other end communicates with the water outlet pipe. Specifically, the water inlet 321 communicates with the water supply pipe, while the water outlet 322 communicates with the water outlet pipe.

[0048] For example, the first heat exchanger 30 includes various other types of heat exchangers, such as a double-tube heat exchanger, a shell-and-tube heat exchanger, and a plate heat exchanger, which are not listed one by one in the embodiments of the present disclosure. For example, the first heat exchanger 30 can be a plate heat exchanger.

[0049] The subcooler 40 is connected in series between the compressor 10 and the refrigerant passage 31 .

[0050] One end of the expansion valve 50 is in communication with the subcooler 40, and the other end is in communication with the second reversing port 24. For example, the expansion valve 50 may be an electronic expansion valve, a thermal expansion valve, or a capillary tube, etc., which are not listed in detail in the embodiments of the present disclosure. For example, the expansion valve 50 may be an electronic expansion valve.

[0051] One end of the second heat exchanger 60 is communicated with the compressor, and the other end thereof is communicated with the subcooler 40 .

[0052] In some embodiments, the water source air conditioning system 100 includes a first heat exchanger 30, a plurality of second heat exchangers 60 and a plurality of expansion valves 50, and the number of the second heat exchangers 60 is equal to the number of the expansion valves 50, and one second heat exchanger 60 is matched with one expansion valve 50. For example, the water source air conditioning system 100 includes one first heat exchanger 30 and one second heat exchanger 60, three second heat exchangers 60 or five second heat exchangers 60, and the embodiments of the present disclosure are not listed one by one. For example, Figure 1 As shown, the water source air conditioning system 100 includes one first heat exchanger 30 and three second heat exchangers 60 .

[0053] The water source air conditioning system 100 has a cooling mode and a heating mode. In the cooling mode, Figure 1 As shown, the first reversing port 23 is connected to the first inlet 21, and the second reversing port 24 is connected to the first outlet 22, that is, the first refrigerant port 311 is connected to the air intake port 11, and the second refrigerant port 312 is connected to the exhaust port 12 of the compressor. The high-temperature and high-pressure gaseous refrigerant flows from the exhaust port 12 through the first inlet 21 and the first reversing port 23 to the first refrigerant port 311, and then enters the first heat exchanger 30. The high-temperature and high-pressure gaseous refrigerant completes heat exchange with water, and the high-temperature and high-pressure gaseous refrigerant releases heat to become a low-temperature and high-pressure gas-liquid two-phase state. The low-temperature and high-pressure gas-liquid two-phase refrigerant flows out of the first heat exchanger 30 from the second refrigerant port 312. The gas-liquid two-phase refrigerant passes through the subcooler 40 and flows to the expansion valve 50. The low-temperature and high-pressure gas-liquid two-phase refrigerant passes through the expansion valve 50. After the expansion valve 50, the refrigerant is converted into a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant flows into the second reversing device 60. The low-temperature, low-pressure liquid refrigerant absorbs heat in the second reversing device 60 and becomes a low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant flows to the intake port 11 through the second reversing port 24 and the first outlet 22, and then flows into the compressor 10. The low-temperature, low-pressure gaseous refrigerant entering the compressor 10 is compressed into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant flows out of the compressor 10 through the exhaust port 12. If bubbles are generated in the low-temperature, high-pressure gas-liquid two-phase refrigerant before the expansion valve 50, the flow rate through the expansion valve 50 will be reduced, resulting in a reduction in the cooling capacity of the water-source air conditioning system 100. The subcooler 40 is used to reduce the risk of bubbles being generated in the low-temperature, high-pressure gas-liquid two-phase refrigerant before the expansion valve 50, thereby improving the cooling capacity of the water-source air conditioning system 100.

[0054] In heating mode, if Figure 2As shown, the first reversing port 23 is connected to the first outlet 22, and the second reversing port 24 is connected to the first inlet 21, that is, the first refrigerant port 311 is connected to the exhaust port 12, and the second refrigerant port 312 is connected to the suction port 11 of the compressor. The high-temperature and high-pressure gaseous refrigerant flows from the exhaust port 12 through the first inlet 21 and the second reversing port 24 to the second heat exchanger 60. The high-temperature and high-pressure gaseous refrigerant releases heat in the second reversing port 60 and becomes a low-temperature and high-pressure gas-liquid two-phase refrigerant. The low-temperature and high-pressure gas-liquid two-phase refrigerant flows to the expansion valve 50. After passing through the expansion valve 50, the low-temperature and high-pressure gas-liquid two-phase refrigerant becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant flows through the cooler and flows into the first refrigerant through the second refrigerant port 312. In the heat exchanger 30, the low-temperature, low-pressure liquid refrigerant completes heat exchange with water, and the low-temperature, low-pressure liquid refrigerant becomes a low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant flows out of the first heat exchanger 30 from the first refrigerant port 311, and the low-temperature, low-pressure gaseous refrigerant flows to the intake port 11 through the first reversing port 23 and the first outlet 22, and then flows into the compressor 10. The low-temperature, low-pressure gaseous refrigerant entering the compressor 10 is compressed into a high-temperature, high-pressure gaseous refrigerant, and the high-temperature, high-pressure gaseous refrigerant flows out of the compressor 10 through the exhaust port 12.

[0055] In the related art, when the indoor load demand is small, that is, the refrigerant absorbs or releases less heat in the second heat exchanger, the constant water inlet volume causes the refrigerant in the first heat exchanger to release or absorb more heat, resulting in a lower pressure value at the exhaust port of the compressor (the working mode of the water source air-conditioning system is the cooling mode), or a higher pressure value at the intake port of the compressor (the working mode of the water source air-conditioning system is the heating mode), which causes the ratio of the exhaust port pressure value of the compressor to the intake port pressure value to exceed the normal ratio range, thereby causing the compressor to shut down or be damaged.

[0056] In order to solve the above problems, the water source air conditioning system 100 provided in the embodiment of the present disclosure also includes a variable flow valve 70 and a controller 80. The variable flow valve 70 is arranged on the water supply pipe. The variable flow valve 70 is used to adjust the flow of water entering the first heat exchanger 30 so that the heat exchange rate of the refrigerant in the first heat exchanger 30 matches the heat exchange rate of the refrigerant in the second heat exchanger 60, so that the ratio of the pressure value of the exhaust port 12 to the pressure value of the intake port 11 is within the normal ratio range.

[0057] The controller 80 is electrically connected to the variable flow valve 70 . The controller 80 is used to adjust the opening of the variable flow valve 70 to adjust the flow of water entering the first heat exchanger 30 .

[0058] In some embodiments, the opening of the variable flow valve 70 is divided into ten gears, each gear corresponds to an opening, and the correspondence between the gear position and the opening of the variable flow valve 70 can be: the higher the gear position, the larger the opening of the variable flow valve 70, and the lower the gear position, the smaller the opening of the variable flow valve 70. Alternatively, the lower the gear position, the larger the opening of the variable flow valve 70, and the higher the gear position, the smaller the opening of the variable flow valve 70. The embodiments of the present disclosure are no longer listed one by one. For example, the correspondence between the gear position and the opening of the variable flow valve 70 is as follows: Figure 3 When the flow rate of water entering the first heat exchanger 30 needs to be increased, the controller 80 increases the gear position of the variable flow valve 70. When the flow rate of water entering the first heat exchanger 30 needs to be reduced, the controller 80 decreases the gear position of the variable flow valve 70. The embodiments of the present disclosure do not limit the number of gear positions of the variable flow valve 70.

[0059] The controller 80 is a device that can generate an operation control signal based on an instruction operation code and a timing signal to instruct the water source air conditioning system 100 to execute the control instruction. For example, the controller 80 can be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller 80 can also be other devices with processing functions, such as circuits, devices, or software modules, and the embodiments of the present application do not impose any restrictions on this.

[0060] In some embodiments, as Figure 4 As shown, the water source air conditioning system 100 includes a first pressure sensor 110 , a second pressure sensor 120 , a first temperature sensor 130 and a second temperature sensor 140 .

[0061] The first pressure sensor 110 is connected to the controller 80 and is disposed at the exhaust port 12 . The first pressure sensor 110 is used to detect a pressure value of the exhaust port 12 and send the detected pressure value of the exhaust port 12 to the controller 80 .

[0062] The second pressure sensor 120 is connected to the controller 80 . The second pressure sensor 120 is disposed at the air inlet 11 . The second pressure sensor 120 is used to detect the pressure value of the air inlet 11 and send the detected pressure value of the air inlet 11 to the controller 80 .

[0063] The first temperature sensor 130 is connected to the controller 80. The first temperature sensor 130 is arranged at the outlet of the supercooler 40. The first temperature sensor 130 is used to detect the refrigerant temperature value at the outlet of the supercooler 40 (the working mode of the water source air-conditioning system 100 is in heating mode) and send the detected refrigerant temperature value at the outlet of the cooler 40 to the controller 80.

[0064] The second temperature sensor 140 is connected to the controller 80 . The second temperature sensor 140 is provided on the water supply pipe. The second temperature sensor 140 is used to detect the water temperature value of the water supply pipe and send the detected water temperature value of the water supply pipe to the controller 80 .

[0065] In some embodiments, the controller 80 obtains the operating mode of the water source air conditioning system 100, the water temperature of the water supply pipe, the pressure value of the exhaust port 12 or the pressure value of the air intake port 11, and determines the initial opening of the variable flow valve 70 according to the operating mode of the water source air conditioning system 100 and the water temperature of the water supply pipe:

[0066] When the working mode of the water source air conditioning system 100 is the cooling mode, the controller 80 determines the initial opening of the variable flow valve 70 based on the water temperature value of the water supply pipe and the first mapping relationship; the first mapping relationship includes multiple temperature intervals and the initial opening corresponding to each temperature interval.

[0067] When the working mode of the water source air conditioning system 100 is the heating mode, the controller 80 determines the initial opening of the variable flow valve 70 based on the water temperature value of the water supply pipeline and the second mapping relationship; the second mapping relationship includes multiple temperature intervals and the initial opening corresponding to each temperature interval.

[0068] The initial opening of the variable flow valve 70 is determined according to the working mode of the water source air-conditioning system 100 and the water temperature value of the water supply pipe, so that the heat exchange rate of the refrigerant in the first heat exchanger 30 can be matched with the heat exchange rate of the refrigerant in the second heat exchanger 60, and the ratio of the pressure value of the exhaust port 12 to the pressure value of the intake port 11 is within the normal ratio range, so as to reduce the risk of shutdown or damage of the compressor 10.

[0069] In some embodiments, when the water-source air conditioning system 100 is in cooling mode, the controller 80 adjusts the operating opening of the variable flow valve 70 based on the pressure value of the air intake port 11, the refrigerant temperature value at the outlet of the subcooler 40, and the water temperature value of the water supply pipe. Thus, throughout the entire operation process, the heat exchange rate of the refrigerant in the first heat exchanger 30 matches the heat exchange rate of the refrigerant in the second heat exchanger 60, ensuring that the ratio of the pressure value of the exhaust port 12 to the pressure value of the air intake port 11 is within a normal ratio range, thereby reducing the risk of compressor 10 shutdown or damage.

[0070] When the water-source air conditioning system 100 is operating in heating mode, the opening of the variable flow valve 70 is adjusted based on the pressure at the intake port 11, the refrigerant temperature at the outlet of the subcooler 40, and the water temperature in the water supply pipe. This ensures that the heat exchange rate of the refrigerant in the first heat exchanger 30 matches that of the refrigerant in the second heat exchanger 60 throughout the entire operation process, keeping the ratio of the pressure at the exhaust port 12 to the pressure at the intake port 11 within a normal range, thereby reducing the risk of compressor 10 shutdown or damage.

[0071] In general, when the water source air conditioning system 100 starts working and during operation, the heat exchange rate of the refrigerant in the first heat exchanger 30 matches the heat exchange rate of the refrigerant in the second heat exchanger 60, so that the ratio of the pressure value of the exhaust port 12 to the pressure value of the intake port 11 is within the normal ratio range, so as to reduce the risk of shutdown or damage of the compressor 10.

[0072] In some embodiments, the water-source air conditioning system 100 further includes an alarm device, which is connected to the controller 80 and is located on the variable flow valve 70. When the water flow in the variable flow valve 70 falls below a preset flow rate, i.e., the opening of the variable flow valve 70 is less than an alarm opening, the controller 80 controls the alarm device to sound an alarm. The alarm opening can be factory-set, user-set based on ambient temperature, or automatically set by the water-source air conditioning system 100 based on ambient temperature.

[0073] When the working mode of the water source air conditioning system 100 is the cooling mode, when the water flow in the variable flow valve 70 is lower than the preset flow, the alarm device does not alarm, which can increase the adjustment range of the variable flow valve 70.

[0074] When the working mode of the water source air conditioning system 100 is the heating mode, the alarm device sounds an alarm, which can reduce the risk of the water source air conditioning system 100 being frozen, thereby improving the reliability of the water source air conditioning system 100.

[0075] In some implementations, the water source air conditioning system 100 further includes a variable frequency water pump, which is disposed on the water supply pipe. One variable frequency water pump corresponds to at least one variable flow valve 70, one variable frequency water pump corresponds to one variable flow valve 70, five variable flow valves 70, or ten variable flow valves 70.

[0076] The variable frequency water pump is connected to a controller 80. The controller calculates the sum of the openings of the variable flow valve 70 corresponding to each variable frequency water pump. If the sum of the openings of the variable flow valve 70 decreases, i.e., the total water flow of the variable flow valve 70 decreases, the speed of the variable frequency water pump is reduced. If the sum of the openings of the variable flow valve 70 remains unchanged, i.e., the total water flow of the variable flow valve 70 remains unchanged, the current speed of the variable frequency water pump is maintained. If the sum of the openings of the variable flow valve 70 increases, i.e., the total water flow of the variable flow valve 70 increases, the speed of the variable frequency water pump is increased. According to the relationship n1 / n2=Q1 / Q2=(H1 / H2)^(1 / 3)=(N1 / N2)^(1 / 2) in the variable frequency water pump, when the flow rate of the variable frequency water pump decreases, the speed of the variable frequency water pump decreases, and the power of the variable frequency water pump decreases. Here, n refers to the speed of the variable frequency water pump, Q refers to the flow rate of the variable frequency water pump, H refers to the head of the variable frequency water pump, and N refers to the power of the variable frequency water pump.

[0077] For example, when a variable frequency water pump corresponds to one variable flow valve 70, the sum of the openings of the variable flow valve 70 corresponding to the one variable frequency water pump refers to the opening of the one variable flow valve 70. When a variable frequency water pump corresponds to three variable flow valves 70, the sum of the openings of the variable flow valve 70 corresponding to the one variable frequency water pump refers to the sum of the openings of the three variable flow valves 70. The embodiments of the present disclosure are not listed one by one.

[0078] In some embodiments, the water source air conditioning system 100 further includes an oil separator 90, which is disposed between the compressor 10 and the four-way reversing valve 20. The oil separator 90 has a second inlet 91, a second outlet 92, and a third outlet 93. The second inlet 91 is connected to the exhaust port 12, the second outlet 92 is connected to the first inlet 21, and the third outlet 93 is connected to the intake port 11 of the compressor 10. A mixture of high-temperature, high-pressure gaseous refrigerant and lubricating oil in the compressor 10 enters the oil separator 90 through the second inlet 91. The oil separator 90 can separate the high-temperature, high-pressure gaseous refrigerant from the lubricating oil. The high-temperature, high-pressure gaseous refrigerant can flow out of the oil separator 90 through the second outlet 92 and then flow into the four-way reversing valve 20 through the first inlet 21. The lubricating oil flows into the compressor 10 through the third outlet 93 and the intake port 11, thereby reducing the risk of damage to the compressor 10. The water-source air conditioning system 100 also includes a lubricating oil recovery circuit 1, which is located between the third outlet 93 and the air intake 11. The lubricating oil recovery circuit 1 includes a first solenoid valve 1001 and a first capillary tube 1002. The first capillary tube 1002 is used to convert high-temperature, high-pressure lubricating oil into low-temperature, low-pressure lubricating oil. When lubricating oil needs to be replenished in the compressor 10, the first solenoid valve 1001 is opened. Otherwise, the first solenoid valve 1001 is closed.

[0079] In some embodiments, the water source air conditioning system 100 also includes a gas-liquid separator 101, which is arranged between the four-way reversing valve 20 and the compressor 10. The gas-liquid separator 101 is provided with a fourth inlet 1011 and a fourth outlet 1012. The fourth inlet 1011 is connected to the first outlet 22, and the fourth outlet 1012 is connected to the air intake 11. The gas-liquid separator 101 is used to separate the liquid refrigerant from the gaseous refrigerant at low temperature and low pressure. The gaseous refrigerant can flow into the compressor 10 through the fourth outlet 1012, and the liquid refrigerant remains in the gas-liquid separator 101. In this way, the risk of liquid refrigerant entering the compressor 10 and causing damage to the compressor 10 can be reduced.

[0080] The water source air conditioning system further includes a high-pressure liquid reservoir 102 , one end of which is connected to the first heat exchanger 30 , and the other end of which is connected to the cooler 40 .

[0081] The water source air conditioning system 100 further includes a refrigerant radiator 103 , one end of which is connected to the high-pressure liquid reservoir 102 , and the other end of which is connected to the cooler 40 .

[0082] The water source air conditioning system 100 also includes a first regulating refrigerant circuit 2, which is arranged between the exhaust port 12 and the fourth inlet 1011. The first regulating refrigerant circuit 2 includes a first regulating solenoid valve 201. When the pressure of the low-temperature, low-pressure gaseous refrigerant before entering the fourth inlet 1011 is low, the first regulating solenoid valve 201 is opened, and the high-temperature, high-pressure gaseous refrigerant exiting the exhaust port 12 mixes with the low-temperature, low-pressure gaseous refrigerant to increase the pressure of the low-temperature, low-pressure gaseous refrigerant. When the pressure of the low-temperature, low-pressure gaseous refrigerant before entering the fourth inlet 1011 is normal, the first regulating solenoid valve 201 is closed.

[0083] The source air conditioning system 100 further includes a second regulating refrigerant circuit 3 , which is provided between the second outlet 92 and the refrigerant radiator 103 . The second regulating refrigerant circuit 3 includes a second regulating solenoid valve 301 and a first one-way valve 302 .

[0084] The embodiment of the present application provides a control method of a water source air conditioning system 100, which is applied to the controller 80 in the water source air conditioning system 100. Figure 5 As shown, the control method may include the following steps:

[0085] S100. Obtain the working mode of the water source air conditioning system, the water temperature value of the water supply pipe, the pressure value of the exhaust port or the pressure value of the air intake port, and determine the initial opening of the variable flow valve 70 based on the working mode of the water source air conditioning system 100 and the water temperature value of the water supply pipe.

[0086] As can be seen from the above, a second temperature sensor 140 is provided on the water supply pipe, and the second temperature sensor 140 can obtain the water temperature value of the water supply pipe in real time.

[0087] In some implementations, it should be understood that in summer, when the water-source air conditioning system 100 is in cooling mode, the first heat exchanger 30 functions as a condenser, and the high-temperature, high-pressure gaseous refrigerant releases heat in the first heat exchanger 30 to become a low-temperature, high-pressure gas-liquid two-phase refrigerant. The water temperature in the water supply pipe is relatively high. The lower the water temperature in the water supply pipe, the more heat the water absorbs. Given the same heat exchange rate between the refrigerant and water in the first heat exchanger 30, the higher the water supply pipe temperature, the larger the initial opening of the variable flow valve 70, while the lower the water supply pipe temperature, the smaller the initial opening of the variable flow valve 70.

[0088] In winter, the water-source air conditioning system 100 is in heating mode. The first heat exchanger 30 functions as an evaporator. Low-temperature, low-pressure liquid refrigerant absorbs heat in the first heat exchanger 30 and becomes low-temperature, low-pressure gaseous refrigerant. The water temperature in the water supply pipe is low. The lower the water temperature in the water supply pipe, the less heat the water releases. Assuming the same heat exchange rate between the refrigerant and water in the first heat exchanger 30, the lower the water temperature in the water supply pipe, the larger the initial opening of the variable flow valve 70. The higher the water temperature in the water supply pipe, the lower the initial opening of the variable flow valve 70.

[0089] Determining the initial opening of the variable flow valve 70 according to the working mode of the water source air conditioning system 100 and the water temperature value of the water supply pipe can reduce the risk of damage to the compressor 10 due to low exhaust pressure value or high suction pressure value.

[0090] S200. In cooling mode, the operating opening of the variable flow valve 70 is adjusted according to the pressure value of the exhaust port 12; in heating mode, the operating opening of the variable flow valve 70 is adjusted according to the pressure value of the intake port 11, the refrigerant temperature value at the outlet of the subcooler 40 and the water temperature value of the water supply pipe.

[0091] In summer, the water-source air conditioning system 100 is in cooling mode, adjusting the opening of the variable flow valve 70 based on the pressure at the exhaust port 12, thereby adjusting the flow of water in the first heat exchanger 30. Thus, during operation, the water-source air conditioning system 100 matches the water-source air conditioning system load 100 (the amount of heat released in the second heat exchanger 60), reducing the risk of compressor 100 shutting down or being damaged due to low pressure at the exhaust port 12.

[0092] In winter, the water-source air conditioning system 100 is in heating mode. The variable flow valve 70 is adjusted according to the pressure at the air intake 11, the refrigerant temperature at the outlet of the subcooler 40, and the water temperature in the water supply pipe, thereby adjusting the flow of water in the first heat exchanger 30. In this way, during operation, the water flow in the first heat exchanger 30 matches the load of the water-source air conditioning system 100 (the amount of heat released in the second heat exchanger 60), reducing the risk of compressor 10 shutdown or damage caused by low pressure at the air intake 11.

[0093] In some embodiments, as Figure 6 As shown, according to the working mode of the water source air conditioning system 100 and the water temperature value of the water supply pipe, determining the initial opening of the variable flow valve 70 may also include the following steps:

[0094] S101: Determine the working mode of the water source air conditioning system 100.

[0095] As a possible implementation method, the water source air conditioning system 100 also includes a third pressure sensor, which is arranged in the first heat exchanger 30 or the second heat exchanger 60. The third pressure sensor is used to detect the pressure value of the refrigerant in the heat exchanger (the first heat exchanger 30 or the second heat exchanger 60) and transmit the detected pressure value of the refrigerant in the heat exchanger to the controller 80. The controller 80 can determine the working mode of the water source air conditioning system 100 based on the refrigerant pressure value detected by the third pressure sensor.

[0096] The third pressure sensor is arranged in the first heat exchanger. When the working mode of the water source air-conditioning system 100 is in the cooling mode, the first heat exchanger 30 is a condenser, and the refrigerant in the first heat exchanger 30 changes from a high-temperature and high-pressure gaseous refrigerant to a low-temperature and high-pressure gas-liquid two-phase refrigerant. At this time, the pressure value of the refrigerant in the first heat exchanger 30 is relatively high. When the controller 80 receives the higher pressure detected by the third pressure sensor, it can be determined that the working mode of the water source air-conditioning system 100 is in the cooling mode.

[0097] When the working mode of the water source air-conditioning system 100 is in the heating mode, the first heat exchanger 30 is an evaporator, and the refrigerant in the first heat exchanger 30 changes from a low-temperature and low-pressure liquid refrigerant to a low-temperature and low-pressure gaseous refrigerant. At this time, the pressure value of the refrigerant in the first heat exchanger 30 is low. When the controller 80 receives the low pressure detected by the third pressure sensor, it can be determined that the working mode of the water source air-conditioning system 100 is in the heating mode.

[0098] S102. In cooling mode, determine the initial opening of the variable flow valve 70 according to the water temperature value of the water supply pipe and a first mapping relationship; the first mapping relationship includes multiple temperature intervals and an initial opening corresponding to each temperature interval.

[0099] As a possible implementation, Figure 7 As shown, Figure 7 The hollow points shown in do not include endpoint values, and the solid points shown include endpoint values. The first mapping relationship includes: when the water temperature value of the water supply pipe is between 5°C and 10°C (including 10°C), the gear position of the variable flow valve 70 is 4, that is, the initial opening of the variable flow valve 70 is 40%. When the water temperature value of the water supply pipe is between 10°C and 15°C (including 15°C), the gear position of the variable flow valve 70 is 5, that is, the initial opening of the variable flow valve 70 is 50%. When the water temperature value of the water supply pipe is between 15°C and 25°C (including 25°C), the gear position of the variable flow valve 70 is 6, that is, the initial opening of the variable flow valve 70 is 60%. When the water temperature value of the water supply pipe is between 25°C and 35°C (including 35°C), the gear position of the variable flow valve 70 is 7, that is, the initial opening of the variable flow valve 70 is 70%. The embodiments of the present disclosure are not listed one by one.

[0100] It is understandable that the temperature variation range corresponding to one gear position of the variable flow valve 70 in the embodiment of the present disclosure may be 5° C., 10° C. or 15° C., and the embodiment of the present disclosure is not limited to this.

[0101] like Figure 7 As shown, the higher the water temperature of the water supply pipe is, the larger the initial opening of the variable flow valve 70 is.

[0102] S103. In heating mode, determine the initial opening of the variable flow valve 70 according to the water temperature of the water supply pipe and a second mapping relationship; the second mapping relationship includes multiple temperature intervals and an initial opening corresponding to each temperature interval.

[0103] As a possible implementation, Figure 8 As shown, Figure 8 The hollow points shown in do not include endpoint values, and the solid points shown include endpoint values. The second mapping relationship includes: when the water temperature value of the water supply pipe is between 5°C and 10°C (including 10°C), the gear position of the variable flow valve 70 is 9, that is, the initial opening of the variable flow valve 70 is 90%. When the water temperature value of the water supply pipe is between 10°C and 15°C (including 15°C), the gear position of the variable flow valve 70 is 8, that is, the initial opening of the variable flow valve 70 is 80%. When the water temperature value of the water supply pipe is between 15°C and 25°C (including 25°C), the gear position of the variable flow valve 70 is 7, that is, the initial opening of the variable flow valve 70 is 70%. When the water temperature value of the water supply pipe is between 25°C and 30°C (including 30°C), the gear position of the variable flow valve 70 is 6, that is, the initial opening of the variable flow valve 70 is 60%. The embodiments of the present disclosure are not listed one by one.

[0104] like Figure 8As shown, the higher the water temperature of the water supply pipe is, the smaller the corresponding initial opening of the variable flow valve 70 is.

[0105] It is understandable that the temperature variation range corresponding to one gear position of the variable flow valve 70 in the embodiment of the present disclosure may be 5° C., 10° C. or 15° C., and the embodiment of the present disclosure is not limited to this.

[0106] In some embodiments, as Figure 9 As shown, adjusting the operating opening of the variable flow valve 70 according to the pressure value of the exhaust port 12 may also include the following steps:

[0107] S201, obtaining a first pressure value of the exhaust port 12 at a first moment and a second pressure value at a second moment, wherein the second moment is after the first moment;

[0108] As can be seen from the above, the exhaust port 12 is provided with a first pressure sensor 110, which can obtain the pressure value of the exhaust port 12 in real time, that is, the first pressure of the exhaust port 12 at a first moment and the second pressure value at a second moment. The second moment is any moment after the first moment. For example, the second moment is 5 minutes, 10 minutes, or 20 minutes away from the first moment. The embodiments of the present disclosure will not be listed one by one. For example, the second moment is 5 minutes away from the first moment.

[0109] S202 , determining whether the second pressure value is less than or equal to a first pressure threshold; wherein the first pressure threshold is a minimum safety pressure value of the exhaust port 12 , and illustratively, the first pressure threshold is 1.9 MPa.

[0110] If the second pressure value is less than or equal to the first pressure threshold, that is, the pressure value at the exhaust port 12 exceeds the minimum safety pressure value of the exhaust port 12, the ratio of the pressure value at the exhaust port 12 to the pressure value at the intake port 11 is outside the normal range, which may cause the compressor 10 to shut down or be damaged. To reduce the risk of damage or shutdown of the compressor 10, it is necessary to increase the pressure value at the exhaust port 12, that is, to reduce the operating opening of the variable flow valve 70. Reducing the operating opening of the variable flow valve 70 can reduce the water flow in the first heat exchanger 30 and reduce the amount of heat absorbed by the water in the first heat exchanger 30 from the refrigerant. This increases the pressure of the refrigerant flowing out of the first heat exchanger 30 and the pressure of the refrigerant flowing into the intake port 11, thereby increasing the pressure at the exhaust port 12 and bringing the ratio of the pressure value at the exhaust port 12 to the pressure value at the intake port 11 within the normal range, thereby reducing the risk of shutdown or damage to the compressor 10.

[0111] If the second pressure value is greater than the first pressure threshold, and the pressure value of the exhaust port 12 does not exceed the minimum safety pressure value of the exhaust port, the following steps are performed:

[0112] S203: Determine whether the second pressure value is less than or equal to the first pressure value, and whether a first difference between the second pressure value and the first pressure threshold is less than or equal to the second pressure threshold;

[0113] If the second pressure value is less than or equal to the first pressure value, that is, the pressure value of the exhaust port 12 gradually decreases with time, if the water flow in the first heat exchanger 30 does not change, after a period of time, the pressure of the exhaust port 12 will be less than the first pressure threshold, resulting in the ratio of the pressure value of the exhaust port 12 to the intake port 11 being outside the normal range, causing the compressor 10 to shut down or be damaged.

[0114] If the second pressure is greater than the first pressure value, that is, the pressure value at the exhaust port 12 is not gradually decreasing, after a period of time, the pressure value at the exhaust port 12 will not be less than the minimum safety pressure value of the exhaust port 12. Therefore, there is no need to reduce the water flow in the first heat exchanger 30, that is, there is no need to reduce the operating opening of the variable flow valve 70.

[0115] If the first difference between the second pressure value and the first pressure threshold is less than or equal to the second pressure threshold, the pressure value at the exhaust port 12 is greater than the minimum safe pressure value at the exhaust port 12 and less than the maximum safe pressure value at the exhaust port 12. The second pressure threshold is related to the pressure range of the exhaust port 12 of the compressor 10. For example, if the pressure range of the exhaust port 12 is large, the second pressure threshold is larger; if the pressure range of the exhaust port 12 is small, the second pressure threshold is smaller. For example, the second pressure threshold is 0.2 MPa.

[0116] If the first difference between the second pressure value and the first pressure threshold is greater than the second pressure threshold, that is, the pressure value of the exhaust port 12 is greater than the minimum safety pressure value of the exhaust port 12, and after a period of time, the pressure value of the exhaust port 12 is greater than the minimum safety pressure value of the exhaust port 12 and less than the maximum safety pressure value of the exhaust port 12, therefore, there is no need to reduce the flow rate of water in the first heat exchanger 30, that is, there is no need to reduce the opening of the variable flow valve 70.

[0117] If the second pressure value is less than or equal to the first pressure value, and the first difference between the second pressure value and the first pressure threshold is less than or equal to the second pressure threshold, that is, the pressure value at the exhaust port 12 is greater than the minimum safety pressure value of the exhaust port 12 and less than the maximum safety pressure value of the compressor's exhaust port, but the pressure at the exhaust port 12 is gradually decreasing, and after a period of time, the pressure at the exhaust port 12 may be less than the minimum safety pressure value of the exhaust port 12, thereby causing the compressor 10 to shut down or be damaged. In this case, the operating opening of the variable flow valve 70 needs to be reduced.

[0118] If the second pressure value is greater than the first pressure value, and / or the first difference between the second pressure value and the first pressure threshold is greater than the second pressure threshold, the following step S204 is executed.

[0119] Illustratively, if the second pressure value is greater than the first pressure value, step S204 is executed. Alternatively, if the first difference between the second pressure value and the first pressure threshold is greater than the second pressure threshold, step S204 is executed. Alternatively, if the second pressure value is greater than the first pressure value and the first difference between the second pressure value and the first pressure threshold is greater than the second pressure threshold, step S204 is executed.

[0120] S204. Determine whether a second difference between the second pressure value and the first pressure value is greater than or equal to a second pressure threshold, and whether a third difference between the third pressure threshold and the second pressure value is less than or equal to a fourth pressure threshold; wherein the third pressure threshold is the maximum safe pressure value of the exhaust port 12. For example, the third pressure threshold is 2.4 MPa.

[0121] If the second difference between the second pressure value and the first pressure value is greater than or equal to the second pressure threshold, that is, as time goes by, the pressure value of the exhaust port 12 gradually increases, and the increasing rate is relatively fast. If the flow rate of water in the first heat exchanger 30 does not change, after a period of time, the pressure of the exhaust port 12 will be higher than the third pressure threshold, thereby causing the ratio of the pressure value of the exhaust port 12 to the intake port 11 to be outside the normal range, causing the compressor 10 to shut down or be damaged.

[0122] If the second difference between the second pressure value and the first pressure value is less than the second pressure threshold, that is, the pressure value at the exhaust port 12 is not gradually increasing, after a period of time, the pressure value at the exhaust port 12 is greater than the minimum safety pressure value of the exhaust port 12 and less than the maximum safety pressure value of the exhaust port 12. Therefore, there is no need to increase the water flow rate in the first heat exchanger 30, that is, there is no need to increase the operating opening of the variable flow valve 70.

[0123] If the third difference between the third pressure threshold and the second pressure value is less than or equal to the fourth pressure threshold, the pressure value at the exhaust port 12 is greater than the minimum safety pressure value at the exhaust port 12 and less than the maximum safety pressure value at the exhaust port 12 of the compressor 10; or, the pressure value at the exhaust port 12 is greater than the maximum safety pressure value at the exhaust port 12. The fourth pressure threshold is related to the pressure range of the exhaust port 12. For example, if the pressure range of the exhaust port 12 is large, the fourth pressure threshold is larger; if the pressure range of the exhaust port 12 is small, the fourth pressure threshold is smaller. For example, the fourth pressure threshold is 0.1 MPa.

[0124] If the third difference between the third pressure threshold and the second pressure value is greater than the fourth pressure threshold, that is, the pressure value at the exhaust port 12 is greater than the minimum safety pressure value of the exhaust port 12 and less than the maximum safety pressure value of the exhaust port 12, after a period of time, the pressure value at the exhaust port 12 is greater than the minimum safety pressure value of the exhaust port 12 and less than the maximum safety pressure value of the exhaust port 12. Therefore, there is no need to increase the flow rate of water in the first heat exchanger 30, that is, there is no need to increase the opening of the variable flow valve 70 (the current operating opening of the variable flow valve 70 is maintained).

[0125] If the second difference between the second pressure value and the first pressure value is greater than or equal to the second pressure threshold, and the third difference between the third pressure threshold and the second pressure value is less than or equal to the fourth pressure threshold. That is, the pressure value of the exhaust port 12 is greater than the minimum safety pressure value of the exhaust port 12, and less than the maximum safety pressure value of the exhaust port 12, but the pressure of the exhaust port 12 is gradually increasing. After a period of time, the pressure of the exhaust port 12 may be higher than the maximum safety pressure value of the exhaust port 12, thereby causing the compressor 10 to shut down or be damaged. At this time, it is necessary to increase the opening of the variable flow valve 70. Alternatively, the pressure value of the exhaust port 12 is greater than the maximum safety pressure value of the exhaust port 12, and the pressure of the exhaust port 12 is gradually increasing. After a period of time, the pressure value of the exhaust port 12 is even higher, thereby causing the compressor 10 to shut down or be damaged. At this time, it is very necessary to increase the opening of the variable flow valve 70.

[0126] If not, that is, if the second difference between the second pressure value and the first pressure value is less than the second pressure threshold, and / or the third difference between the third pressure threshold and the second pressure value is greater than the fourth pressure threshold, the following step S205 is executed.

[0127] Illustratively, if the second difference between the second pressure value and the first pressure value is less than the second pressure threshold, step S205 is executed. Alternatively, if the third difference between the third pressure threshold and the second pressure value is greater than the fourth pressure threshold, step S205 is executed. Alternatively, if the second difference between the second pressure value and the first pressure value is less than the second pressure threshold, and the third difference between the third pressure threshold and the second pressure value is greater than the fourth pressure threshold, step S205 is executed.

[0128] S205: Determine whether the second pressure value is greater than or equal to a third pressure threshold.

[0129] If the second pressure value is greater than or equal to the third pressure threshold, that is, the pressure value at the exhaust port 12 exceeds the maximum safe pressure value of the exhaust port 12, the ratio of the pressure value at the exhaust port 12 to the pressure value at the intake port 11 is outside the normal range, which may cause the compressor 10 to shut down or be damaged. To reduce the risk of damage or shutdown of the compressor 10, the pressure value at the exhaust port 12 needs to be reduced, that is, the operating opening of the variable flow valve 70 needs to be increased. Increasing the operating opening of the variable flow valve 70 can increase the water flow rate within the first heat exchanger 30 and increase the amount of heat absorbed by the water in the first heat exchanger 30 from the refrigerant. This increases the pressure of the refrigerant flowing out of the first heat exchanger 30 and reduces the pressure of the refrigerant flowing into the intake port 11 of the compressor 10. This reduces the pressure at the exhaust port 12 and further reduces the ratio of the pressure value at the exhaust port 12 to the pressure value at the intake port 11 within the normal range, thereby reducing the risk of shutdown or damage to the compressor 10.

[0130] If the second pressure value is lower than the third pressure threshold, that is, the pressure value at the exhaust port 12 is higher than the minimum safety pressure value of the exhaust port 12 and lower than the maximum safety pressure value of the exhaust port 12, after a period of time, the pressure value at the exhaust port 12 is still higher than the minimum safety pressure value of the exhaust port 12 and lower than the maximum safety pressure value of the exhaust port 12. At this time, there is no need to change the water flow rate in the first heat exchanger 30, that is, the current operating opening of the variable flow valve is maintained.

[0131] In some embodiments, Figure 10 As shown, the opening of the variable flow valve 70 is adjusted according to the pressure value of the air intake port 11, the refrigerant temperature value at the outlet of the subcooler 40 and the water temperature value of the water supply pipe. Specifically, the following steps are performed:

[0132] S206 , obtaining a third pressure value of the air intake port 11 , a first temperature value of the outlet of the subcooler 40 , and a second temperature value of the water supply pipe.

[0133] As can be seen from the above, a second pressure sensor 120 is provided at the air intake port 11 to detect the pressure value of the air intake port 11 in real time. A first temperature sensor 130 is provided at the outlet of the subcooler 40 to detect the temperature of the refrigerant at the outlet of the subcooler 40 in real time. A first temperature sensor is provided on the water supply pipe to detect the water temperature in the water supply pipe in real time.

[0134] S207 , determining whether the third pressure value is greater than or equal to a fifth pressure threshold; wherein the fifth pressure threshold is a maximum safety pressure value of the air inlet 11 , illustratively, the fifth pressure threshold is 0.85 MPa.

[0135] If the third pressure value is greater than or equal to the fifth pressure threshold, that is, the pressure value at the intake port 11 exceeds the maximum safe pressure value of the intake port 11, the ratio of the pressure value at the exhaust port 12 to the intake port 11 is outside the normal range, which may cause the compressor 10 to shut down or be damaged. To reduce the risk of damage or shutdown of the compressor 10, it is necessary to reduce the pressure value at the intake port 11, that is, to reduce the operating opening of the variable flow valve 70. Reducing the operating opening of the variable flow valve 70 can reduce the water flow in the first heat exchanger 30 and the amount of heat absorbed by the refrigerant in the first heat exchanger 30 from the water. This reduces the pressure of the refrigerant flowing out of the first heat exchanger 30 and the pressure of the refrigerant flowing into the intake port 11 of the compressor 10. This, in turn, keeps the ratio of the pressure value at the exhaust port 12 to the intake port 11 within the normal range, thereby reducing the risk of shutdown or damage to the compressor 10.

[0136] If the third pressure value is greater than or equal to the fifth pressure threshold, that is, the pressure value of the air inlet 11 does not exceed the maximum safety pressure value of the air inlet 11, perform the following steps:

[0137] S208: Determine whether a third difference between the fifth pressure threshold and the third pressure value is less than or equal to the second pressure threshold, and whether the first temperature value is greater than or equal to the second temperature value;

[0138] If the third difference between the fifth pressure threshold and the third pressure value is less than or equal to the second pressure threshold, the pressure value of the air inlet 11 is greater than the maximum safety pressure value of the air inlet 11 and greater than the minimum safety pressure value of the air inlet 11.

[0139] If the third difference between the fifth pressure threshold and the third pressure value is greater than the second pressure threshold, that is, the pressure value of the intake port 11 is less than the maximum safety pressure value of the exhaust port 12, and after a period of time, the pressure value of the intake port 11 will not be greater than the maximum safety pressure value of the intake port 11, therefore, there is no need to reduce the flow rate of water in the first heat exchanger 30, that is, there is no need to reduce the opening of the variable flow valve 70.

[0140] If the first temperature value is greater than or equal to the second temperature value (the temperature value of the refrigerant at the outlet of the subcooler 40 is greater than the water temperature value on the water supply pipe), it means that the heat absorbed by the refrigerant in the first heat exchanger 30 is greater than the heat released by the refrigerant in the second heat exchanger 60, thereby causing the pressure value of the intake port 11 to gradually increase. If the water flow in the first heat exchanger 30 does not change, after a period of time, the pressure of the intake port 11 is greater than the maximum safety pressure value of the intake port 11, thereby causing the ratio of the pressure value of the exhaust port 12 of the compressor 10 to the intake port 11 to be outside the normal range, causing the compressor 10 to shut down or be damaged.

[0141] If the first temperature value is greater than or less than the second temperature value (the temperature of the refrigerant at the outlet of the subcooler 40 is less than the water temperature at the water supply pipe), it means that the heat absorbed by the refrigerant in the first heat exchanger 30 is not greater than the heat released by the refrigerant in the second heat exchanger 60. After a period of time, the pressure value of the air intake port 11 will not exceed the maximum safe pressure value of the air intake port 11. Therefore, there is no need to reduce the water flow in the first heat exchanger 30, that is, there is no need to reduce the operating opening of the variable flow valve 70.

[0142] If the third difference between the fifth pressure threshold and the third pressure value is less than or equal to the second pressure threshold, and the first temperature value is greater than or equal to the second temperature value, that is, the pressure value at the intake port 11 is less than the maximum safety pressure value of the intake port 11 and greater than the minimum safety pressure value of the intake port 11 of the compressor 10, but the pressure value at the intake port 11 gradually increases, and after a period of time, the pressure at the intake port 11 may exceed the maximum safety pressure value of the intake port 11 of the compressor 10, thereby causing the compressor 10 to shut down or be damaged, then the operating opening of the variable flow valve 70 needs to be reduced.

[0143] If the third difference between the fifth pressure threshold and the third pressure value is greater than the second pressure threshold, and / or the first temperature value is less than the second temperature value, the following step S209 is executed.

[0144] Illustratively, if the third difference between the fifth pressure threshold and the third pressure value is greater than the second pressure threshold, step S209 is executed. Alternatively, if the first temperature value is less than the second temperature value, step S209 is executed. Alternatively, if the third difference between the fifth pressure threshold and the third pressure value is greater than the second pressure threshold, and the first temperature value is less than the second temperature value, step S209 is executed.

[0145] S209: Determine whether a fourth difference between the third pressure value and a sixth pressure threshold is less than or equal to the third pressure threshold, and whether the first temperature value is less than or equal to a fifth difference between the second temperature value and the first temperature threshold. The sixth pressure threshold is a minimum safe pressure value for the air intake port, and illustratively, the sixth pressure threshold is 0.55 MPa.

[0146] If the fourth difference between the third pressure value and the sixth pressure threshold is less than or equal to the third pressure threshold, that is, the pressure value of the intake port 11 is greater than the minimum safety pressure value of the intake port 11 and less than the maximum safety pressure value of the intake port 11 of the compression 10; or, the pressure value of the intake port 11 is less than the minimum safety pressure value of the intake port 11.

[0147] If the fourth difference between the third pressure value and the sixth pressure threshold is greater than the third pressure threshold, that is, the pressure value of the air intake port 11 is greater than the minimum safety pressure value of the air intake port 11 and less than the maximum safety pressure value of the air intake port 11, after a period of time, the pressure value of the air intake port 11 may be greater than the minimum safety pressure value of the air intake port 11 and less than the maximum safety pressure value of the air intake port 11. Therefore, there is no need to increase the flow rate of water in the first heat exchanger 30, that is, maintain the current operating opening of the variable flow valve.

[0148] If the first temperature value is less than or equal to the fifth difference between the second temperature value and the first temperature threshold, it means that the heat absorbed by the refrigerant in the first heat exchanger 30 is less than the heat released by the refrigerant in the second heat exchanger 60, which causes the pressure of the air intake port 11 to gradually decrease. If the flow rate of water in the first heat exchanger 30 does not change, after a period of time, the pressure of the air intake port 11 will be less than the minimum safety pressure value of the air intake port 11, thereby causing the ratio of the pressure value of the exhaust port 12 to the air intake port 11 to be outside the normal range, causing the compressor 10 to shut down or be damaged. The first temperature threshold is related to the temperature change of the refrigerant in the subcooler 40. For example, if the temperature change range of the refrigerant in the subcooler 40 is large, the first temperature threshold is large; if the temperature change of the refrigerant in the subcooler 40 is small, the first temperature threshold is small. For example, the first temperature threshold is 1°C.

[0149] If the first temperature value is greater than the fifth difference between the second temperature value and the first temperature threshold, it means that the heat absorbed by the refrigerant in the first heat exchanger 30 is not less than the heat released by the refrigerant in the second heat exchanger 60, thereby causing the pressure value of the intake port 11 to gradually increase or remain unchanged. If the water flow in the first heat exchanger 30 does not change, after a period of time, the pressure value of the intake port 11 is greater than the minimum safety pressure value of the intake port 11 and less than the maximum safety pressure value of the intake port 11, thereby making the ratio of the pressure value of the exhaust port 12 to the intake port 11 within the normal range, reducing the risk of causing the compressor 10 to shut down or be damaged.

[0150] If it is determined whether the fourth difference between the third pressure value and the sixth pressure threshold is less than or equal to the third pressure threshold, and whether the first temperature value is less than or equal to the fifth difference between the second temperature value and the first temperature threshold. That is, the pressure value of the intake port 11 is less than the maximum safety pressure value of the intake port 11, and greater than the minimum safety pressure value of the intake port 11, but the pressure of the intake port 11 is gradually decreasing. After a period of time, the pressure of the intake port 11 may be less than the maximum minimum safety pressure value of the intake port 11, thereby causing the compressor 10 to shut down or be damaged. At this time, it is necessary to increase the opening of the variable flow valve 70. Alternatively, the pressure value of the intake port 11 is less than the minimum safety pressure value of the intake port 11, and the pressure of the intake port 11 is gradually decreasing. After a period of time, the pressure value of the intake port 11 is even lower, thereby causing the compressor 10 to shut down or be damaged. At this time, it is very necessary to increase the opening of the variable flow valve 70.

[0151] If not, that is, if the fourth difference between the third pressure value and the sixth pressure threshold is greater than the third pressure threshold, and / or the first temperature value is greater than the fifth difference between the second temperature value and the first temperature threshold, the following step S210 is executed.

[0152] For example, if the fourth difference between the third pressure value and the sixth pressure threshold is greater than the third pressure threshold, step S209 is performed. Alternatively, if the first temperature value is greater than the fifth difference between the second temperature value and the first temperature threshold, step S209 is performed. Alternatively, if the fourth difference between the third pressure value and the sixth pressure threshold is greater than the third pressure threshold, and the first temperature value is greater than the fifth difference between the second temperature value and the first temperature threshold, step S210 is performed.

[0153] S210: Determine whether the third pressure value is less than or equal to a sixth pressure threshold.

[0154] If the third pressure value is less than or equal to the sixth pressure threshold, that is, the pressure value at the intake port 11 is less than the minimum safety pressure value of the intake port 11, the ratio of the pressure value at the exhaust port 12 to the intake port 11 is outside the normal range, which may cause the compressor 10 to shut down or be damaged. To reduce the risk of damage or shutdown of the compressor 10, it is necessary to increase the pressure value at the intake port 11, that is, to increase the operating opening of the variable flow valve 70. Increasing the operating opening of the variable flow valve 70 can increase the water flow rate within the first heat exchanger 30 and the amount of heat absorbed by the refrigerant water in the first heat exchanger 30 from the water. This increases the pressure of the refrigerant flowing out of the first heat exchanger 30, and the pressure of the refrigerant flowing into the intake port 11 of the compressor 10 is also higher, resulting in a higher pressure at the intake port 11. This, in turn, brings the ratio of the pressure value at the exhaust port 12 to the intake port 11 within the normal range, thereby reducing the risk of shutdown or damage to the compressor 10.

[0155] If the third pressure value is greater than the sixth pressure threshold, that is, the pressure value at the air intake port 11 is greater than the minimum safety pressure value of the air intake port 11 and less than the maximum safety pressure value of the air intake port 11, after a period of time, the pressure value at the air intake port 11 is still greater than the minimum safety pressure value of the air intake port 11 and less than the maximum safety pressure value of the air intake port 11. At this time, there is no need to change the water flow rate in the first heat exchanger 30, that is, the current operating opening of the variable flow valve 70 is maintained.

[0156] In some embodiments, the control voltage controls the opening of the variable flow valve 70 by outputting a voltage of 0 to 10V, such as Figure 3 As shown, the voltage range corresponds to the opening degree. The opening degree of the variable flow valve 70 corresponds to the voltage N output by the controller. For example, when the opening degree of the variable flow valve 70 is 10%, the output voltage of the controller is 2.8V. When the opening degree of the variable flow valve 70 is 50%, the output voltage of the controller is 6V. The present disclosure does not impose any restrictions on the output voltage corresponding to the opening degree of the variable flow valve 70.

[0157] like Figure 11 As shown, the target opening of the variable flow valve 70 is the first opening D1 (the target opening refers to the opening to which the variable flow valve 70 is intended to be adjusted), and the current opening of the variable flow valve 70 is the second opening D2. It is determined whether the absolute value of the difference voltage ΔN is less than the first voltage threshold. ΔN = (D1-D2) × K, where K is a constant and has a value range of 5 to 15. K is related to the specifications of the variable flow valve 70. The larger the specifications of the variable flow valve 70, the smaller the value of K. The smaller the specifications of the variable flow valve 70, the larger the value of K. For example, K is 10. The first voltage threshold is related to the voltage range. For example, the first voltage threshold is 1V.

[0158] Determine whether the absolute value of the difference voltage ΔN is less than the first voltage threshold

[0159] If so, that is, if the absolute value of the differential voltage ΔN is less than the first voltage threshold, the opening of the variable flow valve 70 is the second opening, that is, the opening of the variable flow valve 70 is maintained at the current state.

[0160] If not, that is, if the absolute value of the difference voltage ΔN is greater than or equal to the first voltage threshold, the opening degree of the variable flow valve 70 is the first opening degree.

[0161] An embodiment of the present invention further provides a computer-readable storage medium, which includes computer-executable instructions. When the computer-executable instructions are executed on a computer, the computer executes the method provided in the above embodiment.

[0162] An embodiment of the present invention further provides a computer program product, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement the method provided in the above embodiment.

[0163] Those skilled in the art will appreciate that in one or more of the above examples, the functions described herein can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0164] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0165] In the several 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 modules or units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another device, 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 through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed in multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0166] In addition, each functional unit in each embodiment of the present invention can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or in other words, the part that contributes to the prior art or all or 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 device (which can be a single-chip microcomputer, chip, etc.) or a processor to perform all or part of the steps of the method of each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk.

[0167] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims. In the description of this specification, specific features, structures, materials or characteristics may be combined in any appropriate manner in any one or more embodiments or examples.

Claims

1. A water source air conditioning system having a cooling mode and a heating mode; characterized in that: include: A compressor, including an air intake and an air discharge port; The first heat exchanger includes a refrigerant channel and a heat medium channel, wherein one end of the refrigerant channel is connected to the air intake port and the other end is connected to the air exhaust port; one end of the heat medium channel is connected to the water supply pipe and the other end is connected to the water outlet pipe; a second heat exchanger connected in series between the compressor and the first heat exchanger; a variable flow valve, provided on the water supply pipe; a subcooler connected in series between the second heat exchanger and the refrigerant channel; A controller, electrically connected to the variable flow valve, is configured to: Obtaining the working mode of the water source air conditioning system, the water temperature value of the water supply pipe, the pressure value of the exhaust port or the pressure value of the intake port; determining an initial opening of the variable flow valve according to an operating mode of the water source air conditioning system and a water temperature value of the water supply pipe so that a heat exchange amount in the first heat exchanger matches a heat exchange amount in the second heat exchanger; In the cooling mode, the operating opening of the variable flow valve is adjusted according to the pressure value of the exhaust port so that the heat release in the first heat exchanger matches the heat absorption in the second heat exchanger; In the heating mode, the opening of the variable flow valve is adjusted according to the pressure value of the air intake port, the refrigerant temperature value at the outlet of the subcooler, and the water temperature value of the water supply pipe, so that the heat absorption in the first heat exchanger matches the heat release in the second heat exchanger. The operation opening of the variable flow valve is determined according to the working mode of the water source air conditioning system and the water temperature value of the water supply pipe, and specifically the following steps are performed: Determining the operating mode of the water source air conditioning system; In the cooling mode, determining the initial opening degree according to the water temperature value of the water supply pipe and the first mapping relationship; The first mapping relationship includes a plurality of temperature intervals and an initial opening corresponding to each temperature interval; In the heating mode, determining the initial opening degree according to the water temperature value of the water supply pipe and a second mapping relationship; The second mapping relationship includes multiple temperature intervals and an initial opening corresponding to each temperature interval. The operation opening of the variable flow valve is adjusted according to the pressure value of the exhaust port, and the following steps are specifically performed: Acquire a first pressure value of the exhaust port at a first moment and a second pressure value at a second moment, wherein the second moment is after the first moment; Determine whether the second pressure value is less than or equal to a first pressure threshold; wherein the first pressure threshold is a minimum safety pressure value of the exhaust port; If so, reducing the operating opening of the variable flow valve; If not, determining whether the second pressure value is less than or equal to the first pressure value, and whether a first difference between the second pressure value and the first pressure threshold is less than or equal to the second pressure threshold; If so, reducing the operating opening of the variable flow valve; If not, determining whether a second difference between the second pressure value and the first pressure value is greater than or equal to a second pressure threshold, and whether a third difference between the third pressure threshold and the second pressure value is less than or equal to a fourth pressure threshold; wherein the third pressure threshold is the maximum safe pressure value of the exhaust port; If the second difference is greater than or equal to a second pressure threshold, and the third difference is less than or equal to a fourth pressure threshold, increasing the operating opening of the variable flow valve; If the second difference is less than the second pressure threshold, and / or the third difference is greater than the fourth pressure threshold, determining whether the second pressure value is greater than or equal to the third pressure threshold; If the second pressure value is greater than or equal to the third pressure threshold, increasing the operating opening of the variable flow valve; If the second pressure value is less than the third pressure threshold, the current operating opening of the variable flow valve is maintained.

2. The water source air conditioning system according to claim 1, characterized in that: The water source air conditioning system also includes: a four-way reversing valve having a first inlet, a first outlet, a first reversing port, and a second reversing port; the first inlet is connected to the exhaust port, the first outlet is connected to the intake port, the first reversing port is connected to the refrigerant channel, and the second reversing port is connected to the second heat exchanger; An expansion valve has one end connected to the subcooler and the other end connected to the second heat exchanger.

3. The water source air conditioning system according to claim 1 or 2, characterized in that: The water source air conditioning system also includes a variable frequency water pump, which is arranged on the water supply pipe and connected to the controller. The controller is also configured to adjust the speed of the variable frequency water pump according to the opening of the variable flow valve.

4. The water source air conditioning system according to claim 3, characterized in that: The water source air conditioning system also includes an alarm device, which is connected to the controller. In the cooling mode, the controller is further configured to control the alarm device to alarm when the flow in the variable flow valve is less than a preset flow.

5. The water source air conditioning system according to claim 4, characterized in that: In the case where the water source air conditioning system includes a four-way reversing valve, the water source air conditioning system further includes an oil separator, and the oil separator is connected in series between the compressor and the four-way reversing valve.

6. The water source air conditioning system according to claim 5, characterized in that: The water source air conditioning system also includes a lubricating oil recovery loop, one end of which is connected to the oil separator and the other end is connected to the compressor.

7. A control method for a water source air conditioning system according to any one of claims 1 to 6, characterized in that: The method comprises: Obtaining the working mode of the water source air conditioning system, the water temperature value of the water supply pipe, the pressure value of the exhaust port or the pressure value of the intake port; determining an initial opening of the variable flow valve according to an operating mode of the water source air conditioning system and a water temperature value of the water supply pipe; In the cooling mode, adjusting the operating opening of the variable flow valve according to the pressure value of the exhaust port; In the heating mode, the operating opening of the variable flow valve is adjusted according to the pressure value of the air intake port, the refrigerant temperature value at the outlet of the subcooler, and the water temperature value of the water supply pipe. The operation opening of the variable flow valve is adjusted according to the pressure value of the exhaust port, and the following steps are specifically performed: Acquire a first pressure value of the exhaust port at a first moment and a second pressure value at a second moment, wherein the second moment is after the first moment; Determine whether the second pressure value is less than or equal to a first pressure threshold; wherein the first pressure threshold is a minimum safety pressure value of the exhaust port; If so, reducing the operating opening of the variable flow valve; If not, determining whether the second pressure value is less than or equal to the first pressure value, and whether a first difference between the second pressure value and the first pressure threshold is less than or equal to the second pressure threshold; If so, reducing the operating opening of the variable flow valve; If not, determining whether a second difference between the second pressure value and the first pressure value is greater than or equal to a second pressure threshold, and whether a third difference between the third pressure threshold and the second pressure value is less than or equal to a fourth pressure threshold; wherein the third pressure threshold is the maximum safe pressure value of the exhaust port; If the second difference is greater than or equal to a second pressure threshold, and the third difference is less than or equal to a fourth pressure threshold, increasing the operating opening of the variable flow valve; If the second difference is less than the second pressure threshold, and / or the third difference is greater than the fourth pressure threshold, determining whether the second pressure value is greater than or equal to the third pressure threshold; If the second pressure value is greater than or equal to the third pressure threshold, increasing the operating opening of the variable flow valve; If the second pressure value is less than the third pressure threshold, the current operating opening of the variable flow valve is maintained.

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