Multi-connected heat pump system, control method thereof and computer readable storage medium

Abstract

Embodiments of the present application provide a multi-split heat pump system, a control method thereof and a computer readable storage medium, comprising: obtaining the discharge temperature of the compressor and the inlet water temperature and outlet water temperature of the hydraulic module; controlling the rotating speed of the water pump according to the discharge temperature, the inlet water temperature and the outlet water temperature, and controlling the frequency of the compressor according to the inlet water temperature, the outlet water temperature and a preset temperature difference interval. Firstly, the embodiments of the present application can control the inlet and outlet water temperature difference by adjusting the rotating speed of the water pump and the frequency of the compressor, so as to prevent the situation that the inlet and outlet water temperature difference is too large and the outlet water temperature is too high due to too high frequency and too small water flow; secondly, the embodiments of the present application also control the rotating speed of the water pump in combination with the discharge temperature of the compressor, so that the control of the water pump is associated with the state of the compressor; in addition, the embodiments of the present application also preset the temperature difference interval, so as to reasonably control in different intervals based on the inlet and outlet water temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a multi-split heat pump system, a control method thereof, and a computer-readable storage medium. Background Art

[0002] In the prior art, to improve the indoor temperature regulation capability of heat pump systems, hydraulic modules and auxiliary heating devices can be added to the heat pump system. However, when the temperature difference between the inlet and outlet water of the hydraulic module is too large, these heat pump systems typically rely on a water flow switch to detect water shortages and provide protection. This provides limited reliable solutions to the problems of large inlet and outlet water temperature differences and high outlet water temperatures. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a multi-split heat pump system and a control method and a computer-readable storage medium thereof, aiming to improve the reliability of the multi-split heat pump system.

[0004] In a first aspect, an embodiment of the present application provides a control method for a multi-split heat pump system, wherein the multi-split heat pump system includes an outdoor unit and a hydraulic module, the outdoor unit includes a compressor, the hydraulic module includes a water pump, a first heat exchange circuit, and a second heat exchange circuit that exchanges heat with the first heat exchange circuit, the first heat exchange circuit and the outdoor unit are interconnected, and the water pump and the second heat exchange circuit are interconnected; the control method includes:

[0005] Obtaining the exhaust temperature of the compressor and the water inlet temperature and water outlet temperature of the hydraulic module;

[0006] controlling the rotation speed of the water pump according to the exhaust temperature, the water inlet temperature, and the water outlet temperature;

[0007] The frequency of the compressor is controlled according to the water inlet temperature, the water outlet temperature and a preset temperature difference range.

[0008] According to some embodiments of the present application, the hydraulic module further includes a water circuit heater, the water outlet of the second heat exchange circuit is connected to the water inlet of the water circuit heater, and the water outlet of the water circuit heater is used to be connected to the auxiliary heat device; the outlet water temperature includes a first outlet water temperature of the outlet of the water circuit heater; and controlling the speed of the water pump according to the exhaust temperature, the inlet water temperature, and the outlet water temperature includes:

[0009] Calculating a first inlet and outlet water temperature difference between the first outlet water temperature and the inlet water temperature;

[0010] The rotation speed of the water pump is controlled according to the exhaust temperature and the first inlet and outlet water temperature difference.

[0011] According to some embodiments of the present application, controlling the rotational speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference includes:

[0012] When the exhaust temperature is lower than a first preset exhaust temperature, the rotation speed of the water pump is controlled according to the first inlet and outlet water temperature difference and a preset temperature difference, wherein the preset temperature difference is determined by the inlet water temperature.

[0013] According to some embodiments of the present application, the preset temperature difference includes a first preset temperature difference and a second preset temperature difference, and the first preset temperature difference is less than the second preset temperature difference; and controlling the speed of the water pump according to the first inlet and outlet water temperature difference and the preset temperature difference includes one of the following:

[0014] When the first inlet and outlet water temperature difference is less than the first preset temperature difference, reducing the rotation speed of the water pump;

[0015] When the first inlet and outlet water temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference, maintaining the rotation speed of the water pump;

[0016] When the first inlet and outlet water temperature difference is greater than the second preset temperature difference, the rotation speed of the water pump is increased.

[0017] According to some embodiments of the present application, the preset temperature difference further includes a third preset temperature difference, and the third preset temperature difference is greater than the second preset temperature difference; and the controlling the speed of the water pump according to the first inlet and outlet water temperature difference and the preset temperature difference further includes:

[0018] When the first inlet and outlet water temperature difference is greater than the third preset temperature difference, the water pump is controlled to operate at a maximum speed.

[0019] According to some embodiments of the present application, before controlling the rotational speed of the water pump according to the exhaust temperature, the water inlet temperature, and the water outlet temperature, the control method further includes:

[0020] When the exhaust temperature is greater than a second preset exhaust temperature, controlling the water pump to operate at a maximum speed;

[0021] Until the exhaust temperature drops and is lower than a third preset exhaust temperature, the speed of the water pump is controlled according to the exhaust temperature, the water inlet temperature and the water outlet temperature, wherein the third preset exhaust temperature is lower than the second preset exhaust temperature.

[0022] According to some embodiments of the present application, the outlet water temperature further includes a second outlet water temperature at the outlet end of the second heat exchange circuit; and controlling the frequency of the compressor according to the inlet water temperature, the outlet water temperature, and a preset temperature difference range includes:

[0023] Calculating a second inlet and outlet water temperature difference between the second outlet water temperature and the inlet water temperature;

[0024] The frequency of the compressor is controlled according to the second inlet and outlet water temperature difference and a preset temperature difference range.

[0025] According to some embodiments of the present application, controlling the frequency of the compressor according to the second inlet and outlet water temperature difference and a preset temperature difference range includes one of the following:

[0026] When the second inlet and outlet water temperature difference is within the first temperature difference range, the frequency of the compressor is not limited;

[0027] When the second inlet and outlet water temperature difference is within a second temperature difference range, increasing the frequency of the compressor, wherein the second temperature difference range is greater than the first temperature difference range;

[0028] When the second inlet and outlet water temperature difference is within a third temperature difference range, maintaining the frequency of the compressor, wherein the third temperature difference range is greater than the second temperature difference range;

[0029] When the second inlet and outlet water temperature difference is within the frequency reduction temperature difference interval, the frequency of the compressor is reduced, wherein the frequency reduction temperature difference interval is greater than the third temperature difference interval.

[0030] According to some embodiments of the present application, when the second inlet and outlet water temperature difference is within a frequency reduction temperature difference range, reducing the frequency of the compressor includes one of the following:

[0031] When the second inlet and outlet water temperature difference is within a fourth temperature difference range, reducing the frequency of the compressor according to the first frequency reduction range, wherein the fourth temperature difference range is greater than the third temperature difference range;

[0032] When the second inlet and outlet water temperature difference is within the fifth temperature difference range, the frequency of the compressor is reduced according to a second frequency reduction range, wherein the fifth temperature difference range is greater than the fourth temperature difference range, and the second frequency reduction range is greater than the first frequency reduction range.

[0033] According to some embodiments of the present application, when the second inlet and outlet water temperature difference is within a frequency reduction temperature difference range, reducing the frequency of the compressor includes:

[0034] Obtaining a first frequency lower limit value corresponding to the second outlet water temperature and a second frequency lower limit value corresponding to the outdoor ambient temperature;

[0035] Selecting the maximum value of the first frequency lower limit value and the second frequency lower limit value as the target frequency lower limit value;

[0036] The frequency of the compressor is reduced until the frequency of the compressor is equal to the target frequency lower limit value.

[0037] According to some embodiments of the present application, controlling the frequency of the compressor according to the second inlet and outlet water temperature difference and a preset temperature difference range includes:

[0038] Obtaining the minimum and maximum frequencies allowed for the compressor to operate, as well as the total number of gears of the compressor;

[0039] controlling the operating gear of the compressor according to the second inlet and outlet water temperature difference and a preset temperature difference range;

[0040] The frequency of the compressor is determined according to the operating gear, the total number of gears, the minimum frequency, and the maximum frequency.

[0041] In a second aspect, an embodiment of the present application provides a multi-split heat pump system, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the processor runs the computer program, the control method of the multi-split heat pump system as described in the first aspect above is executed.

[0042] In a third aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method of the multi-split heat pump system as described in the first aspect above.

[0043] According to the technical solution of the embodiment of the present application, there are at least the following beneficial effects: for a multi-split heat pump system provided with a hydraulic module, the embodiment of the present application can obtain the exhaust temperature of the compressor and the inlet and outlet water temperatures of the hydraulic module; then the embodiment of the present application can control the speed of the water pump according to the exhaust temperature, inlet and outlet water temperature, and control the frequency of the compressor according to the inlet and outlet water temperature and the preset temperature difference interval. First, the embodiment of the present application can control the inlet and outlet water temperature difference by adjusting the water pump speed and the compressor frequency, and can prevent the inlet and outlet water temperature difference from being too large and the outlet water temperature from being too high due to the frequency being too high and the water flow being too small; secondly, the embodiment of the present application also combines the exhaust temperature of the compressor to control the speed of the water pump, so that the control of the water pump is associated with the state of the compressor; in addition, the embodiment of the present application also presets the temperature difference interval, which can reasonably perform interval control based on the inlet and outlet water temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

[0044] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0046] Figure 1 Schematic diagram of a system architecture platform for executing a control method for a multi-split heat pump system provided by one embodiment of the present application;

[0047] Figure 2 This is a schematic diagram of the overall structure of a multi-split heat pump system provided by an embodiment of the present application;

[0048] Figure 3 This is a structural diagram of a hydraulic module in a multi-split heat pump system provided by one embodiment of the present application;

[0049] Figure 4 This is a schematic structural diagram of an auxiliary heating device in a multi-split heat pump system provided by one embodiment of the present application;

[0050] Figure 5 This is a flowchart of the steps of a control method for a multi-split heat pump system provided by one embodiment of the present application;

[0051] Figure 6 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0052] Figure 7 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0053] Figure 8 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0054] Figure 9 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0055] Figure 10 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0056] Figure 11 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0057] Figure 12 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0058] Figure 13 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0059] Figure 14 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0060] Figure 15 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0061] Figure 16 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0062] Figure 17 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0063] Figure 18 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0064] Figure 19 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0065] Figure 20 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0066] Figure 21 is a flowchart of the steps of a control method for a multi-split heat pump system provided by another embodiment of the present application;

[0067] Figure 22 This is a schematic diagram of multiple temperature difference intervals provided in an embodiment of the present application. DETAILED DESCRIPTION

[0068] The following describes embodiments of the present application in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0069] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0070] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0071] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0072] In some cases, to improve a heat pump system's ability to regulate indoor temperature, a hydraulic module and auxiliary heating device can be added to the system. However, when a significant temperature difference exists between the inlet and outlet water of the hydraulic module, these heat pump systems typically rely on a water flow switch to detect water shortages and provide protection. This provides limited reliable solutions to the problem of excessive temperature differences and high outlet water temperatures.

[0073] Based on the above situation, the embodiments of the present application propose a multi-split heat pump system, a control method thereof, and a computer-readable storage medium, aiming to improve the reliability of the multi-split heat pump system.

[0074] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0075] like Figure 1 As shown, Figure 1 This is a schematic diagram of a system architecture platform for executing a control method for a multi-split heat pump system provided in one embodiment of the present application.

[0076] The system architecture platform 100 of the embodiment of the present application includes one or more processors 110 and a memory 120. Figure 1 In the figure, a processor 110 and a memory 120 are taken as an example.

[0077] The processor 110 and the memory 120 may be connected via a bus or other means. Figure 1 The bus connection is taken as an example.

[0078] The memory 120 is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 120 may include a high-speed random access memory and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 120 may optionally include a memory 120 remotely located relative to the processor 110, and these remote memories may be connected to the system architecture platform 100 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0079] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation on the system architecture platform 100, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0080] exist Figure 1 In the system architecture platform 100 shown, the processor 110 can be used to call the control program of the multi-split heat pump system stored in the memory 120, thereby implementing the control method of the multi-split heat pump system.

[0081] Based on the hardware structure of the above-mentioned system architecture platform 100, various embodiments of the multi-split heat pump system of the present application are proposed.

[0082] like Figures 2 to 4 As shown, Figure 2 This is a schematic diagram of the overall structure of a multi-split heat pump system provided by an embodiment of the present application; Figure 3 This is a structural diagram of a hydraulic module in a multi-split heat pump system provided by one embodiment of the present application; Figure 4 It is a structural schematic diagram of an auxiliary heating device in a multi-split heat pump system provided in one embodiment of the present application.

[0083] In one embodiment, the multi-split heat pump system of the embodiment of the present application includes but is not limited to an outdoor unit 200 and a hydraulic module 300, wherein the outdoor unit 200 includes a compressor 210, the hydraulic module 300 includes a water pump 310, a first heat exchange circuit 320 and a second heat exchange circuit 330, the first heat exchange circuit 320 and the second heat exchange circuit 330 perform heat exchange, the first heat exchange circuit 320 and the outdoor unit 200 are interconnected, and the water pump 310 and the second heat exchange circuit 330 are interconnected.

[0084] In one embodiment, the multi-split heat pump system of the embodiment of the present application also includes but is not limited to an indoor unit 400, and the indoor unit 400 includes one or more air-conditioning indoor units 410; in addition, the outdoor unit 200 in the multi-split heat pump system of the embodiment of the present application also includes but is not limited to an outdoor heat exchanger 220, and the compressor 210, the outdoor heat exchanger 220, the first heat exchange circuit 320 and the air-conditioning indoor unit 410 are interconnected.

[0085] In one embodiment, the multi-split heat pump system of the embodiment of the present application also includes but is not limited to an auxiliary heating device 500, which includes a water supply pipeline 510, a return water pipeline 520 and a heat exchange coil assembly 530. The heat exchange coil assembly 530 is used to assist in heating the indoor environment. The heat exchange coil assembly 530 connects the water supply pipeline 510 and the return water pipeline 520, and the water supply pipeline 510 and the return water pipeline 520 are both connected to the second heat exchange circuit 330.

[0086] Among them, in order to better prevent the temperature stratification of the indoor environment, such as: the temperature of the upper layer (the area near the ceiling) is higher, but the temperature of the lower layer (living area) is lower; at this time, the auxiliary heating device 500 can be placed in the lower layer (living area), such as the wall and / or floor of the indoor environment, as long as it is convenient for the auxiliary heating device 500 to exchange heat with the lower space of the indoor environment. It should be noted that the first heat exchange coil 531 of the heat exchange coil assembly 530 can be a coil-shaped heat exchanger. It can be understood that it is a roughly spiral piping system, such as a disc-shaped aluminum-plastic pipe; such as a floor heating coil installed in a U-shaped shape, etc. A heat exchanger can be a device that realizes heat transfer between materials between two or more fluids at different temperatures. The heat exchanger can also transfer heat from a higher temperature fluid to a lower temperature fluid (or from a lower temperature fluid to a higher temperature fluid) so that the fluid temperature reaches the indicators specified by the process to meet the needs of the process conditions. It is also a device for improving energy utilization. Therefore, the heat exchange coil can be understood as a spiral device used to transfer heat between two or more fluids at different temperatures.

[0087] It should be noted that a heat exchange medium (refrigerant, water or other heat-conducting medium, the technical solution of this application is introduced below with water as the heat exchange medium) can be provided in the second heat exchange circuit 330, the water supply pipeline 510, the return water pipeline 520 and the heat exchange coil assembly 530, so that after the second heat exchange circuit 330 and the first heat exchange circuit 320 perform heat exchange, the heat exchange medium flows in the second heat exchange circuit 330, the water supply pipeline 510, the return water pipeline 520 and the heat exchange coil assembly 530, thereby realizing heat exchange.

[0088] Furthermore, the heat exchange between the first heat exchange circuit 320 and the second heat exchange circuit 330 in the hydraulic module 300 can be performed using any of the following methods: heat conduction, heat convection, or heat radiation, as long as the heat exchange between the first heat exchange circuit 320 and the second heat exchange circuit 330 can be achieved in a relatively short period of time. In one embodiment, the first heat exchange circuit 320 and the second heat exchange circuit 330 can be operated using heat conduction. Specifically, heat can be transferred from the first heat exchange circuit 320 to the second heat exchange circuit 330 by directly contacting the first heat exchange circuit 320 and the second heat exchange circuit 330, or through an intermediate heat transfer medium. Using heat conduction allows for more convenient heat transfer and reduces production costs.

[0089] In one embodiment, the return water pipe 520 is provided with an automatic water replenishment valve 540. During the heat exchange process, the heat exchange medium in the pipe may decrease due to evaporation or other reasons. The provision of the automatic water replenishment valve 540 can ensure that the heat exchange medium is sufficient, ensuring that the first heat exchange coil 531 has sufficient heat exchange medium to exchange heat with the indoor environment, thereby ensuring heat exchange efficiency.

[0090] In heating mode, refrigerant enters the air conditioner 410 from the output of compressor 210. After exchanging heat with the indoor environment in the air conditioner 410, the refrigerant enters the outdoor heat exchanger 220, and then flows from the outdoor heat exchanger 220 into the input of compressor 210. Furthermore, after flowing out of the output of compressor 210, the refrigerant flows into the first heat exchange circuit 320 of the hydraulic module 300, thereby increasing the temperature of the first heat exchange circuit 320. This first heat exchange circuit 320 exchanges heat with the second heat exchange circuit 330, and the refrigerant, after heat exchange, flows back from the first heat exchange circuit 320 to the input of compressor 210. At this time, the second heat exchange circuit 330 receives heat from the first heat exchange circuit 320. The heated second heat exchange circuit 330 heats the connected water supply line 510, which in turn heats the heat exchange coil assembly 530 of the auxiliary heating device 500. This allows the heat exchange coil assembly 530 to assist in heating the indoor environment. The heat exchange medium then flows back to the second heat exchange circuit 330 through the return water line 520 for the next heating cycle. Since both the air conditioner indoor unit 410 and the auxiliary heating device 500 heat the indoor environment in heating mode, the indoor temperature rises evenly. In this way, the embodiments of the present application can improve the indoor temperature-raising capability of the multi-split system and prevent temperature stratification in the indoor environment.

[0091] In one embodiment, the heat exchange coil assembly 530 includes a plurality of first heat exchange coils 531, each of which is connected to the water supply pipe 510 and the return pipe 520. The provision of a plurality of first heat exchange coils 531 can increase the contact area between the heat exchange coil assembly 530 and the indoor environment, thereby improving the heat exchange efficiency with the indoor environment. It is understood that the plurality of first heat exchange coils 531 can be connected in series or in parallel. In this embodiment, the plurality of first heat exchange coils 531 are connected in parallel because the parallel connection allows the first heat exchange coils 531 to be heated individually, making it easier for the user to control the heat exchange coils. Furthermore, the parallel connection allows the plurality of first heat exchange coils 531 to be heated simultaneously (unlike the series connection, which requires heating in sequence), thereby improving the heat exchange efficiency. In addition, an electric actuator 532 for controlling water inlet can be set at the inlet end of the first heat exchange coil 531, so that the user can control the rate of heat exchange medium entering the first heat exchange coil 531 through the electric actuator 532, thereby controlling the heating temperature and heating efficiency of the indoor environment, which is convenient for use.

[0092] In some embodiments of the present application, the heat exchange coil assembly 530 further includes a water distributor 533 and a water collector 534. The water distributor 533 is in communication with the water supply line 510, and the water collector 534 is in communication with the water return line 520. The water inlet of the first heat exchange coil 531 is in communication with the water distributor 533, and the water outlet of the first heat exchange coil 531 is in communication with the water collector 534. The provision of the water distributor 533 ensures that the water inlet of the heat exchange coil assembly 530 always has a certain water pressure. Therefore, when the electric actuator 532 controls the water inlet, the first heat exchange coil 531 can be replenished immediately, thereby ensuring the heat exchange efficiency of the first heat exchange coil 531. In addition, by setting up a water collector 534 connected to the water outlet end of the first heat exchange coil 531, when the electric actuator 532 controls the water inlet, the water in the first heat exchange coil 531 can directly enter the water collector 534, thereby facilitating the replenishment of heat exchange medium for the first heat exchange coil 531 in the first time, thereby ensuring the heat exchange efficiency of the heat exchange coil.

[0093] In one embodiment, the multi-split system further includes a connecting pipe connecting the water distributor 533 and the water collector 534, with a bypass valve 535 disposed on the connecting pipe. Connecting the water collector 534 and the water distributor 533 allows the water supply line 510 and the return line 520 to circulate without passing through the first heat exchange coil 531, thereby ensuring smooth circulation of the heat exchange medium through the water supply line 510, the water distributor 533, the water collector 534, the return line 520, and the second heat exchange circuit 330. This allows the heat exchange medium in the multi-split system to maintain a high temperature, facilitating timely heating of the first heat exchange coil 531 and improving heat exchange efficiency for the indoor environment. It will be appreciated that both the water distributor 533 and the water collector 534 are provided with a chamber for holding the heat transfer medium, thereby facilitating the storage of the heat transfer medium.

[0094] In one embodiment, the VRF system further includes a water tank 550, which is disposed within the water supply line 510. In one state of use, the water tank 550 is in communication with the water supply line 510. That is, water flowing out of the second heat exchange loop 330 enters the water tank 550 for storage and then flows out of the water tank 550 for heat exchange in the indoor environment. This allows the hot water after heat exchange in the second heat exchange loop 330 to be stored, ensuring that the hot water supply can be replenished when the hot water supply is insufficient, thereby ensuring the heating efficiency of the first heat exchange coil 531 and the heat exchange efficiency of the VRF system for the indoor environment.

[0095] In one embodiment, the VRF system further includes a second heat exchange coil 551 for heating the liquid in the water tank 550. The water inlet of the second heat exchange coil 551 is connected to the water supply line 510, and the outlet of the second heat exchange coil 551 is connected to the return line 520. In another operating state, the water tank 550 is not connected to the water supply line 510 (i.e., the heat exchange medium in the water supply line 510 cannot flow into the water tank 550 for storage). Instead, the second heat exchange coil 551 connected to the water supply line 510 is provided to heat the water tank 550, thereby allowing the water tank 550 to store cleaner water (or other liquid to be heated), thereby improving the functionality of the water tank 550.

[0096] In one embodiment, the second heat exchange coil 551 is disposed through the water tank 550 and is at least partially located within the water tank 550. It is understood that the wall of the water tank 550 is provided with a mounting hole for the second heat exchange coil 551 to extend into and out of. The mounting hole is also provided with a waterproof joint to ensure that the water tank 550 maintains a good seal when the second heat exchange coil 551 is installed in the water tank 550. By extending the second heat exchange coil 551 into the water tank 550, the liquid to be heated contained in the water tank 550 can be directly heated. This direct heat exchange heating method can accelerate the temperature rise of the liquid to be heated, reduce heat consumption, and improve the heat exchange rate. In one embodiment, the water tank 550 can also be connected to a water replenishment device, so that when the water tank 550 needs to be replenished, the water tank 550 can be replenished with water to ensure sufficient water in the water tank 550.

[0097] In one embodiment, the second heat exchange coil 551 is sleeved on the outer wall of the water tank 550. This arrangement can also effectively heat the water tank 550, and since no structural changes are required to the water tank 550, the stability of the water tank 550 structure is ensured, and the production cost is reduced.

[0098] In one embodiment, the multi-split system further includes a water spraying device 552 connected to a water tank 550. A return pump 553 is provided in the pipe connecting the water spraying device 552 and the water tank 550. The water spraying device 552 allows a user to spray the water in the water tank 550. In one embodiment, the water spraying device 552 may include a shower head, so that the user can shower with the water in the water tank 550. Furthermore, by providing the return pump 553 in the pipe connecting the water spraying device 552 and the water tank 550, the return pump 553 can be used to pump water from the water tank 550 when the water spraying device 552 is in use. When the water spraying device 552 is not in use, the return pump 553 can be used to pump water out of the water spraying device 552 (the water inlet port of the water spraying device 552 can be closed in this case), thereby preventing water accumulation in the water spraying device 552 and improving the service life of the water spraying device 552.

[0099] In one embodiment, the multi-split system further includes a three-way valve 554. The water inlet of the three-way valve 554 is connected to the water supply line 510, the first water outlet of the three-way valve 554 is connected to the water inlet of the second heat exchange coil 551, and the second water outlet of the three-way valve 554 is connected to the water inlet of the first heat exchange coil 531. The provision of the three-way valve 554 on the water supply line 510 allows the water supply line 510 to supply heat solely to the first heat exchange coil 531 or solely to the second heat exchange coil 551. This facilitates the user to centrally utilize the heat of the heat exchange medium, prevents the heat exchange medium from flowing into areas where the user does not need to heat, and improves the heat exchange efficiency of the multi-split system.

[0100] In some embodiments of the present application, a water temperature sensor 555 is provided in the water tank 550; the water temperature sensor 555 can be a water temperature sensor, and a thermistor is provided in the water temperature sensor, so that the temperature of the water in the water tank 550 can be better sensed, which is convenient for the user to control the temperature and use of the water tank 550.

[0101] In one embodiment, the first heat exchange circuit 320 includes an inlet section, a heat exchange section, and an outlet section. The heat exchange section is connected to the inlet section and the outlet section. The heat exchange section is used for heat exchange with the second heat exchange circuit 330 .

[0102] In one embodiment, the second heat exchange circuit 330 includes a water inlet pipeline, a heat exchange pipeline and a water outlet pipeline. The heat exchange pipeline connects the water inlet pipeline and the water outlet pipeline. The water inlet pipeline connects to the return water pipeline 520 , and the water outlet pipeline connects to the water supply pipeline 510 .

[0103] In one embodiment, the outlet pipe is provided with an expansion tank 380, a pressure relief valve 340, an exhaust valve 370, a water flow switch 350, and a water heater 360 along the outlet direction. This arrangement facilitates smoother outflow of the heat exchange medium from the second heat exchange loop 330, ensures the stability of the outlet pipe, and improves the heat exchange efficiency of the multi-split system.

[0104] Based on the above-mentioned system architecture platform and the hardware structure of the multi-split heat pump system, various embodiments of the control method of the multi-split heat pump system of the present application are proposed.

[0105] like Figure 5 As shown, Figure 5 This is a flow chart of a control method for a multi-split heat pump system provided by one embodiment of the present application. This control method can be applied to the multi-split heat pump system of any of the above embodiments, and may include but is not limited to step S510, step S520, and step S530.

[0106] Step S510: Acquire the exhaust temperature of the compressor and the water inlet and outlet temperatures of the hydraulic module;

[0107] Step S520: controlling the speed of the water pump according to the exhaust temperature, the water inlet temperature, and the water outlet temperature;

[0108] Step S530: Control the frequency of the compressor according to the inlet water temperature, the outlet water temperature and the preset temperature difference range.

[0109] In one embodiment, the embodiment of the present application can obtain the exhaust temperature of the compressor and the inlet and outlet water temperatures of the hydraulic module through temperature sensors. Then, the embodiment of the present application can increase, decrease or maintain the speed of the water pump according to the exhaust temperature, inlet and outlet water temperatures, and can increase, decrease or maintain the frequency of the compressor according to the inlet and outlet water temperatures and a preset temperature difference range.

[0110] It is worth noting that the embodiment of the present application can control the inlet and outlet water temperature difference by adjusting the water pump speed and the compressor frequency, which can prevent the inlet and outlet water temperature difference from being too large and the outlet water temperature from being too high due to the frequency being too high and the water flow being too small; secondly, the embodiment of the present application also combines the exhaust temperature of the compressor to control the water pump speed, so that the control of the water pump is related to the state of the compressor; in addition, the embodiment of the present application also presets the temperature difference range, which can reasonably perform interval control based on the inlet and outlet water temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

[0111] In addition, if Figure 6 As shown, Figure 6 This is a flow chart of a control method for a multi-split heat pump system provided in another embodiment of the present application. The aforementioned outlet water temperature includes the first outlet water temperature at the outlet end of the water heater. Regarding the aforementioned step S520 of controlling the water pump speed based on the exhaust temperature, inlet water temperature, and outlet water temperature, this may include, but is not limited to, steps S610 and S620.

[0112] Step S610, calculating a first inlet and outlet water temperature difference between a first outlet water temperature and an inlet water temperature;

[0113] Step S620: Control the rotation speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference.

[0114] In one embodiment, the embodiment of the present application can calculate the first inlet and outlet water temperature difference between the first outlet water temperature and the inlet water temperature, and then increase, decrease or maintain the speed of the water pump based on the exhaust temperature and the first inlet and outlet water temperature difference.

[0115] In addition, if Figure 7 As shown, Figure 7 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. Regarding the above step S620 of controlling the speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference, it may include but is not limited to steps S710 and S720.

[0116] Step S710: When the exhaust temperature is lower than the first preset exhaust temperature;

[0117] Step S720: Control the rotation speed of the water pump according to the first inlet and outlet water temperature difference and the preset temperature difference, wherein the preset temperature difference is determined by the inlet water temperature.

[0118] In one embodiment, only when the exhaust temperature is lower than the first preset exhaust temperature will the embodiment of the present application compare the first inlet and outlet water temperature difference with the preset temperature difference, and then control the speed of the water pump according to the comparison result.

[0119] It should be noted that the above-mentioned preset temperature difference can be determined by the inlet water temperature; in addition, the specific numerical value of the above-mentioned preset temperature difference is not specifically limited in this application.

[0120] In addition, it should be noted that the above-mentioned first preset exhaust temperature can be 85°C, 100°C, or other temperature values. The embodiment of the present application does not specifically limit the numerical value of the first preset exhaust temperature.

[0121] It should be noted that, when the preset temperature difference includes a first preset temperature difference and a second preset temperature difference, and the first preset temperature difference is less than the second preset temperature difference, the control of the speed of the water pump according to the first inlet and outlet water temperature difference and the preset temperature difference in step S720 may include but is not limited to Figures 8 to 10 There are three implementation scenarios, as follows:

[0122] like Figure 8 As shown, Figure 8 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. Regarding the above step S720, it may include but is not limited to step S810 and step S820.

[0123] Step S810: When the first inlet and outlet water temperature difference is less than the first preset temperature difference;

[0124] Step S820: Reduce the rotation speed of the water pump.

[0125] like Figure 9 As shown, Figure 9 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. The above step S720 may include but is not limited to step S910 and step S920.

[0126] Step S910: When the first inlet and outlet water temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference;

[0127] Step S920: Maintain the rotation speed of the water pump.

[0128] like Figure 10 As shown, Figure 10 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. The above step S720 may include but is not limited to step S1010 and step S1020.

[0129] Step S1010: When the first inlet and outlet water temperature difference is greater than the second preset temperature difference;

[0130] Step S1020: Increase the rotation speed of the water pump.

[0131] In one embodiment, if the first inlet and outlet water temperature difference is less than the first preset temperature difference, then the embodiment of the present application can respond by reducing the speed of the water pump; if the first inlet and outlet water temperature difference is between the first preset temperature difference and the second preset temperature difference, then the embodiment of the present application can respond by maintaining the speed of the water pump; if the first inlet and outlet water temperature difference is greater than the second preset temperature difference, then the embodiment of the present application can respond by increasing the speed of the water pump.

[0132] In addition, it should be noted that the numerical values ​​of the first preset temperature difference and the second preset temperature difference are not specifically limited in the embodiment of the present application.

[0133] In addition, if Figure 11 As shown, Figure 11 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. When the preset temperature difference further includes a third preset temperature difference, and the third preset temperature difference is greater than the second preset temperature difference, controlling the water pump speed based on the first inlet and outlet water temperature difference and the preset temperature difference in step S720 may further include, but is not limited to, steps S1110 and S1120.

[0134] Step S1110: When the first inlet and outlet water temperature difference is greater than the third preset temperature difference;

[0135] Step S1120: Control the water pump to run at the maximum speed.

[0136] In one embodiment, the embodiment of the present application can set a third preset temperature difference. If the first inlet and outlet water temperature difference is greater than the third preset temperature difference, the embodiment of the present application will control the water pump to run at the maximum speed immediately without restriction.

[0137] It should be noted that the embodiment of the present application does not specifically limit the value of the third preset temperature difference mentioned above.

[0138] In addition, if Figure 12 As shown, Figure 12 Flowchart of a control method for a multi-split heat pump system according to another embodiment of the present application. Before executing the above step S520, the control method according to the embodiment of the present application may further include but is not limited to step S1210 and step S1220.

[0139] Step S1210: When the exhaust temperature is greater than the second preset exhaust temperature, the water pump is controlled to operate at the maximum speed;

[0140] Step S1220: until the exhaust temperature drops and is lower than a third preset exhaust temperature, the speed of the water pump is controlled according to the exhaust temperature, the water inlet temperature, and the water outlet temperature, wherein the third preset exhaust temperature is lower than the second preset exhaust temperature.

[0141] In one embodiment, when the exhaust temperature is greater than the second preset exhaust temperature, the water pump immediately outputs at the maximum speed. Once this control is entered, it is released after the exhaust temperature is lower than the third preset exhaust temperature and returns to normal control.

[0142] It should be noted that the embodiment of the present application does not specifically limit the numerical value of the second preset exhaust temperature.

[0143] In addition, if Figure 13 As shown, Figure 13 This is a flow chart of a control method for a multi-split heat pump system provided in another embodiment of the present application. The aforementioned outlet water temperature also includes the second outlet water temperature at the outlet end of the second heat exchange circuit. Regarding step S530, controlling the compressor frequency based on the inlet water temperature, outlet water temperature, and a preset temperature difference range may include, but is not limited to, steps S1310 and S1320.

[0144] Step S1310, calculating a second inlet and outlet water temperature difference between a second outlet water temperature and an inlet water temperature;

[0145] Step S1320: Control the frequency of the compressor according to the second inlet and outlet water temperature difference and the preset temperature difference range.

[0146] In one embodiment, the embodiment of the present application can calculate the second inlet and outlet water temperature difference between the second outlet water temperature and the inlet water temperature, and then compare the second inlet and outlet water temperature difference with the preset temperature difference range, and increase, decrease or maintain the frequency of the compressor according to the comparison result.

[0147] It should be noted that the above-mentioned preset temperature difference interval can be one or more, and the embodiment of the present application does not specifically limit the number of preset temperature difference intervals.

[0148] It should be noted that the frequency of the compressor controlled according to the second inlet and outlet water temperature difference and the preset temperature difference range in step S1320 may include but is not limited to: Figures 14 to 17 The four implementation scenarios are as follows:

[0149] like Figure 14 As shown, Figure 14 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. The above step S1320 may include but is not limited to step S1410 and step S1420.

[0150] Step S1410: when the second inlet and outlet water temperature difference is within the first temperature difference range;

[0151] Step S1420: The frequency of the compressor is not limited.

[0152] like Figure 15 As shown, Figure 15 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. The above step S1320 may include but is not limited to step S1510 and step S1520.

[0153] Step S1510: when the second inlet and outlet water temperature difference is within the second temperature difference range, wherein the second temperature difference range is greater than the first temperature difference range;

[0154] Step S1520: Increase the frequency of the compressor.

[0155] like Figure 16 As shown, Figure 16 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. The above step S1320 may include but is not limited to step S1610 and step S1620.

[0156] Step S1610: when the second inlet and outlet water temperature difference is within the third temperature difference range, wherein the third temperature difference range is greater than the second temperature difference range;

[0157] Step S1620: Maintain the frequency of the compressor.

[0158] like Figure 17As shown, Figure 17 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. Regarding the above step S1320, it may include but is not limited to step S1710 and step S1720.

[0159] Step S1710: When the second inlet and outlet water temperature difference is within the frequency reduction temperature difference interval, wherein the frequency reduction temperature difference interval is greater than the third temperature difference interval;

[0160] Step S1720: Reduce the frequency of the compressor.

[0161] It should be noted that, when the second inlet and outlet water temperature difference is within the frequency reduction temperature difference range, the frequency reduction of the compressor in step S1720 may include but is not limited to: Figures 18 and 19 There are two implementation scenarios, as follows:

[0162] like Figure 18 As shown, Figure 18 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. The above step S1720 may include but is not limited to step S1810 and step S1820.

[0163] Step S1810: when the second inlet and outlet water temperature difference is within the fourth temperature difference range, wherein the fourth temperature difference range is greater than the third temperature difference range;

[0164] Step S1820: Reduce the frequency of the compressor according to a first frequency reduction amplitude.

[0165] like Figure 19 As shown, Figure 19 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. The above step S1720 may include but is not limited to step S1910 and step S1920.

[0166] Step S1910: when the second inlet and outlet water temperature difference is within the fifth temperature difference interval, wherein the fifth temperature difference interval is greater than the fourth temperature difference interval;

[0167] Step S1920: reducing the frequency of the compressor according to a second frequency reduction amplitude, wherein the second frequency reduction amplitude is greater than the first frequency reduction amplitude.

[0168] In one embodiment, based on the above Figures 14 to 19 The steps in the process are as follows:

[0169] For the first temperature difference range: it is the normal operating range, and the frequency of the compressor is not limited; for the second temperature difference range: it is the slow frequency increase range, and the frequency of the compressor will gradually increase; for the third temperature difference range: it is the maintenance range, and the frequency of the compressor is maintained; for the fourth temperature difference range: it is the slow frequency reduction range, and the frequency of the compressor will slowly decrease; for the fifth temperature difference range: it is the fast frequency reduction range, and the frequency of the compressor will quickly decrease.

[0170] like Figure 20 As shown, Figure 20 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. When the second inlet and outlet water temperature difference is within the frequency reduction temperature difference range, reducing the compressor frequency in step S1720 may include, but is not limited to, steps S2010, S2020, and S2030.

[0171] Step S2010: Obtain a first frequency lower limit value corresponding to the second outlet water temperature and a second frequency lower limit value corresponding to the outdoor ambient temperature;

[0172] Step S2020: Select the maximum value of the first frequency lower limit value and the second frequency lower limit value as the target frequency lower limit value;

[0173] Step S2030: Reduce the frequency of the compressor until the frequency of the compressor is equal to the target frequency lower limit.

[0174] In one embodiment, for the slow frequency reduction interval and the fast frequency reduction interval, the embodiment of the present application will set a target frequency lower limit value, which is the maximum value of the first frequency lower limit value corresponding to the second water outlet temperature and the second frequency lower limit value corresponding to the outdoor ambient temperature. When the frequency of the compressor drops to the target frequency lower limit value, the frequency of the compressor will remain unchanged.

[0175] like Figure 21 As shown, Figure 21 This is a flow chart of a control method for a multi-split heat pump system provided by another embodiment of the present application. Regarding the above-mentioned step S1320 of controlling the frequency of the compressor based on the second inlet and outlet water temperature difference and the preset temperature difference range, it may include but is not limited to steps S2110, S2120, and S2130.

[0176] Step S2110: Obtain the minimum and maximum frequencies allowed for the compressor to operate, as well as the total number of gears of the compressor;

[0177] Step S2120: controlling the operating gear of the compressor according to the second inlet and outlet water temperature difference and the preset temperature difference range;

[0178] Step S2130: Determine the frequency of the compressor according to the operating gear, the total number of gears, the minimum frequency, and the maximum frequency.

[0179] In one embodiment, the embodiment of the present application can convert the gear position and frequency of the compressor, so that the frequency of the compressor can be obtained according to the gear position, and the gear position of the compressor can also be obtained according to the frequency.

[0180] Based on the control methods of the multi-split heat pump system of each of the above embodiments, overall embodiments of the control methods of the multi-split heat pump system of the present application are respectively proposed below.

[0181] In one embodiment, the present application embodiment includes DC water pump control and compressor control, which are specifically as follows:

[0182] For DC water pump control: When the DC water pump is turned off and on, it will first run at the highest speed for a minute (recommended value: 5 minutes, range: 1 to 20 minutes). After running for a minute, the exhaust temperature and the temperature difference between the total outlet water temperature of the heat exchanger hydraulic module and the inlet water temperature of the hydraulic module are detected every t1 time (recommended value: 40 seconds, range: 20 to 150 seconds) and adjusted. The adjustment action is as follows:

[0183] (1) When the exhaust temperature TP is less than T1 (recommended value 100°C, range 85-110°C), refer to the following Table 1:

[0184]

[0185] Table 1

[0186] (2) Explanation of the value of A: When TW_in≥48℃, A=7.5, when TW_in<48℃, A=4.5.

[0187] (3) When the exhaust temperature TP ≥ 95℃, the water pump will immediately output at the maximum speed. Once this control is entered, it will not be released until TP < 90℃ and return to normal control.

[0188] For compressor control: Figure 22 As shown, five intervals are set, and the interval where the difference between TW_out and TW_in is calculated is located. The control of each interval is as follows:

[0189] (1) Interval 1: Normal operating interval, no frequency limit.

[0190] (2) Interval 2: Slow frequency increase interval. When there is a hydraulic module, the TW_out correction increases by one level every 4 minutes to the highest frequency.

[0191] (3) Interval 3: Holding interval, the compressor frequency is maintained.

[0192] (4) Interval 4: Slow frequency reduction interval, the current operating frequency is immediately reduced by 1 level, and then reduced by 1 level every 30 seconds, and the frequency will not decrease further until it reaches the minimum frequency corresponding to the outlet water temperature and the outdoor ambient temperature T4 (the larger value of the two).

[0193] (5) Interval 5: Rapid frequency reduction interval, the current operating frequency is immediately reduced by 2 levels, and then reduced by 2 levels every 30 seconds, and the frequency will not decrease further until it reaches the minimum frequency corresponding to the outlet water temperature and the outdoor ambient temperature T4 (the larger value of the two).

[0194] Among them, the relationship between the gear position and frequency of the compressor is as follows: the compressor gear position is N, corresponding to the frequency fn = fmin + (N-1) * (fmax-fmin) / M, where fmin is the lowest frequency value allowed for the compressor to operate, and fmax is the highest frequency value allowed for the compressor to operate; M is the frequency gear, an integer, the recommended value is 21, and the range is 18 to 25 gears; N gear, an integer, 1≤N≤M; generally, the fn and fn+1 frequency values ​​corresponding to gears N and N+1 differ by 2 to 8 Hz.

[0195] Based on the control methods of the multi-split heat pump system in the above-mentioned embodiments, various embodiments of the controller, the multi-split heat pump system and the computer-readable storage medium of the present application are respectively proposed below.

[0196] In addition, an embodiment of the present application provides a controller, which includes: a processor, a memory, and a computer program stored in the memory and executable on the processor.

[0197] The processor and the memory may be connected via a bus or other means.

[0198] It should be noted that the controller in this embodiment may include: Figure 1 The processor and memory in the illustrated embodiment both belong to the same inventive concept, and therefore both have the same implementation principles and beneficial effects, which will not be described in detail here.

[0199] The non-transient software program and instructions required to implement the control method of the multi-split heat pump system of the above embodiment are stored in the memory, and when executed by the processor, the control method of the multi-split heat pump system of the above embodiment is executed.

[0200] According to the technical solution of the controller of the embodiment of the present application, first, the embodiment of the present application can control the inlet and outlet water temperature difference by adjusting the water pump speed and the compressor frequency, which can prevent the inlet and outlet water temperature difference from being too large and the outlet water temperature from being too high due to the frequency being too high and the water flow being too small; secondly, the embodiment of the present application also combines the exhaust temperature of the compressor to control the speed of the water pump, so that the control of the water pump is related to the state of the compressor; in addition, the embodiment of the present application also presets the temperature difference range, which can reasonably perform interval control based on the inlet and outlet water temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

[0201] It is worth noting that since the controller of the embodiment of the present application can execute the control method of the multi-split heat pump system of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the controller of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the multi-split heat pump system of any of the above-mentioned embodiments.

[0202] In addition, an embodiment of the present application further provides a multi-split heat pump system, which includes the controller of any of the above embodiments.

[0203] According to the technical solution of the multi-split heat pump system of the embodiment of the present application, first, the embodiment of the present application can control the inlet and outlet water temperature difference by adjusting the water pump speed and the compressor frequency, which can prevent the inlet and outlet water temperature difference from being too large and the outlet water temperature from being too high due to the frequency being too high and the water flow being too small; secondly, the embodiment of the present application also combines the exhaust temperature of the compressor to control the water pump speed, so that the control of the water pump is related to the state of the compressor; in addition, the embodiment of the present application also presets the temperature difference range, which can reasonably perform interval control based on the inlet and outlet water temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

[0204] It is worth noting that since the multi-split heat pump system of the embodiment of the present application includes the controller of any of the above-mentioned embodiments, and the controller of any of the above-mentioned embodiments can execute the control method of the multi-split heat pump system of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the multi-split heat pump system of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the multi-split heat pump system of any of the above-mentioned embodiments.

[0205] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions for executing the control method of the multi-split heat pump system described above. Figures 5 to 21 The method steps in .

[0206] According to the technical solution of the computer-readable storage medium of the embodiment of the present application, first, the embodiment of the present application can control the inlet and outlet water temperature difference by adjusting the water pump speed and the compressor frequency, which can prevent the inlet and outlet water temperature difference from being too large and the outlet water temperature from being too high due to the frequency being too high and the water flow being too small; secondly, the embodiment of the present application also combines the exhaust temperature of the compressor to control the speed of the water pump, so that the control of the water pump is related to the state of the compressor; in addition, the embodiment of the present application also presets the temperature difference range, which can reasonably perform interval control based on the inlet and outlet water temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

[0207] It is worth noting that since the computer-readable storage medium of the embodiment of the present application can execute the control method of the multi-split heat pump system of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the multi-split heat pump system of any of the above-mentioned embodiments.

[0208] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0209] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", and "assembly" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection. The terms "installation", "connection", and "fixed connection" can refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0210] Although the embodiments disclosed in this application are as described above, the contents are only embodiments adopted to facilitate understanding of this application and are not intended to limit this application. Any person skilled in the art to which this application belongs may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this application. However, the scope of patent protection of this application shall still be defined by the attached claims.

[0211] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the art can also make various equivalent modifications or substitutions under the shared conditions that do not violate the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control method for a multi-split heat pump system, characterized in that: The multi-split heat pump system includes an outdoor unit and a hydraulic module, the outdoor unit includes a compressor, the hydraulic module includes a water pump, a first heat exchange circuit, and a second heat exchange circuit that exchanges heat with the first heat exchange circuit, the first heat exchange circuit and the outdoor unit are interconnected, and the water pump and the second heat exchange circuit are interconnected; the control method includes: Obtaining the exhaust temperature of the compressor and the water inlet temperature and water outlet temperature of the hydraulic module; controlling the rotation speed of the water pump according to the exhaust temperature, the water inlet temperature, and the water outlet temperature; Controlling the frequency of the compressor according to the water inlet temperature, the water outlet temperature and a preset temperature difference range; The hydraulic module further comprises a water circuit heater, the water outlet of the second heat exchange circuit is connected to the water inlet of the water circuit heater, and the water outlet of the water circuit heater is used to be connected to the auxiliary heat device; the outlet water temperature comprises a first outlet water temperature of the outlet of the water circuit heater; and controlling the speed of the water pump according to the exhaust temperature, the inlet water temperature, and the outlet water temperature comprises: calculating a first inlet and outlet water temperature difference between the first outlet water temperature and the inlet water temperature; and controlling the speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference; In addition, controlling the speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference includes: when the exhaust temperature is less than a first preset exhaust temperature, controlling the speed of the water pump according to the first inlet and outlet water temperature difference and a preset temperature difference, wherein the preset temperature difference is determined by the inlet water temperature; In addition, the outlet water temperature also includes the second outlet water temperature of the outlet end of the second heat exchange circuit; and controlling the frequency of the compressor according to the inlet water temperature, the outlet water temperature, and a preset temperature difference range includes: Calculating a second inlet and outlet water temperature difference between the second outlet water temperature and the inlet water temperature; The frequency of the compressor is controlled according to the second inlet and outlet water temperature difference and a preset temperature difference range.

2. The control method according to claim 1, characterized in that: The preset temperature difference includes a first preset temperature difference and a second preset temperature difference, and the first preset temperature difference is smaller than the second preset temperature difference; and controlling the rotation speed of the water pump according to the first inlet and outlet water temperature difference and the preset temperature difference includes one of the following: When the first inlet and outlet water temperature difference is less than the first preset temperature difference, reducing the rotation speed of the water pump; When the first inlet and outlet water temperature difference is greater than or equal to the first preset temperature difference and less than or equal to the second preset temperature difference, maintaining the rotation speed of the water pump; When the first inlet and outlet water temperature difference is greater than the second preset temperature difference, the rotation speed of the water pump is increased.

3. The control method according to claim 2, characterized in that: The preset temperature difference further includes a third preset temperature difference, and the third preset temperature difference is greater than the second preset temperature difference; and the method of controlling the speed of the water pump according to the first inlet and outlet water temperature difference and the preset temperature difference further includes: When the first inlet and outlet water temperature difference is greater than the third preset temperature difference, the water pump is controlled to operate at a maximum speed.

4. The control method according to any one of claims 1 to 3, characterized in that: Before controlling the rotation speed of the water pump according to the exhaust temperature, the water inlet temperature, and the water outlet temperature, the control method further includes: When the exhaust temperature is greater than a second preset exhaust temperature, controlling the water pump to operate at a maximum speed; Until the exhaust temperature drops and is lower than a third preset exhaust temperature, the speed of the water pump is controlled according to the exhaust temperature, the water inlet temperature and the water outlet temperature, wherein the third preset exhaust temperature is lower than the second preset exhaust temperature.

5. The control method according to claim 1, characterized in that: The controlling the frequency of the compressor according to the second inlet and outlet water temperature difference and a preset temperature difference range includes one of the following: When the second inlet and outlet water temperature difference is within the first temperature difference range, the frequency of the compressor is not limited; When the second inlet and outlet water temperature difference is within a second temperature difference range, increasing the frequency of the compressor, wherein the second temperature difference range is greater than the first temperature difference range; When the second inlet and outlet water temperature difference is within a third temperature difference range, maintaining the frequency of the compressor, wherein the third temperature difference range is greater than the second temperature difference range; When the second inlet and outlet water temperature difference is within the frequency reduction temperature difference interval, the frequency of the compressor is reduced, wherein the frequency reduction temperature difference interval is greater than the third temperature difference interval.

6. The control method according to claim 5, characterized in that: When the second inlet and outlet water temperature difference is within the frequency reduction temperature difference range, reducing the frequency of the compressor includes one of the following: When the second inlet and outlet water temperature difference is within a fourth temperature difference range, reducing the frequency of the compressor according to the first frequency reduction range, wherein the fourth temperature difference range is greater than the third temperature difference range; When the second inlet and outlet water temperature difference is within the fifth temperature difference range, the frequency of the compressor is reduced according to a second frequency reduction range, wherein the fifth temperature difference range is greater than the fourth temperature difference range, and the second frequency reduction range is greater than the first frequency reduction range.

7. The control method according to claim 5, characterized in that: When the second inlet and outlet water temperature difference is within the frequency reduction temperature difference range, reducing the frequency of the compressor includes: Obtaining a first frequency lower limit value corresponding to the second outlet water temperature and a second frequency lower limit value corresponding to the outdoor ambient temperature; Selecting the maximum value of the first frequency lower limit value and the second frequency lower limit value as the target frequency lower limit value; The frequency of the compressor is reduced until the frequency of the compressor is equal to the target frequency lower limit value.

8. The control method according to claim 1, characterized in that: The controlling the frequency of the compressor according to the second inlet and outlet water temperature difference and a preset temperature difference range includes: Obtaining the minimum and maximum frequencies allowed for the compressor to operate, as well as the total number of gears of the compressor; controlling the operating gear of the compressor according to the second inlet and outlet water temperature difference and a preset temperature difference range; The frequency of the compressor is determined according to the operating gear, the total number of gears, the minimum frequency, and the maximum frequency.

9. A multi-split heat pump system, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method for a multi-split heat pump system according to any one of claims 1 to 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that: Computer-executable instructions are stored, and the computer-executable instructions are used to execute the control method of the multi-split heat pump system according to any one of claims 1 to 8.

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