CN116608556A

CN116608556A - Multi-split heat pump system, control method thereof and computer readable storage medium

Info

Publication number: CN116608556A
Application number: CN202310574215.3A
Authority: CN
Inventors: 王正兴; 陈炽明; 陶骙; 黎顺全
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2023-05-19
Filing date: 2023-05-19
Publication date: 2023-08-18

Abstract

The embodiment of the application provides a multi-split heat pump system, a control method thereof and a computer readable storage medium, comprising the following steps: acquiring the exhaust temperature of a compressor and the water inlet temperature and the water outlet temperature of a hydraulic module; the rotation speed of the water pump is controlled according to the exhaust temperature, the inlet water temperature and the outlet water temperature, and the frequency of the compressor is controlled according to the inlet water temperature, the outlet water temperature and a preset temperature difference interval. Firstly, the embodiment of the application can control the water inlet and outlet temperature difference by adjusting the rotation speed of the water pump and the frequency of the compressor, and can prevent the conditions of overlarge water inlet and outlet temperature difference and higher water outlet temperature caused by overhigh frequency and small water flow; secondly, the embodiment of the application also combines the exhaust temperature of the compressor to control the rotating 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 application also presets a temperature difference interval, and can reasonably control the interval based on the water inlet and outlet temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

Description

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

Technical Field

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

Background

In the related art, in order to improve the temperature adjustment capability of the heat pump system to the indoor environment, a hydraulic module and an auxiliary heating device may be optionally added to the heat pump system. For the heat pump system, when the temperature difference between the water inlet and the water outlet of the hydraulic module is too large, the water is generally detected to be lack by means of a water flow switch for protection, and the problems that the water inlet and outlet temperature difference is too large and the water outlet temperature is too high are difficult to be solved more reliably.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a multi-split heat pump system, a control method thereof and a computer readable storage medium, and aims to improve the reliability of the multi-split heat pump system.

In a first aspect, an embodiment of the present application provides a control method of a multi-split heat pump system, where 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 loop, and a second heat exchange loop that exchanges heat with the first heat exchange loop, the first heat exchange loop and the outdoor unit are mutually communicated, and the water pump and the second heat exchange loop are mutually communicated; the control method comprises the following steps:

Acquiring the exhaust temperature of the compressor and the water inlet temperature and the 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;

and controlling the frequency of the compressor according to the water inlet temperature, the water outlet temperature and a preset temperature difference interval.

According to some embodiments of the application, the hydraulic module further comprises a waterway heater, the water outlet end of the second heat exchange loop is communicated to the water inlet end of the waterway heater, and the water outlet end of the waterway heater is used for being communicated to the auxiliary heating device; the water outlet temperature comprises a first water outlet temperature of a water outlet end of the waterway heater; the controlling the rotation speed of the water pump according to the exhaust temperature, the inlet water temperature and the outlet water temperature comprises the following steps:

calculating a first inlet-outlet water temperature difference between the first outlet water temperature and the inlet water temperature;

and controlling the rotating speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference.

According to some embodiments of the application, the controlling the rotational 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 smaller than a first preset exhaust temperature, the rotating speed of the water pump is controlled according to the first water inlet and outlet temperature difference and a preset temperature difference, wherein the preset temperature difference is determined by the water inlet temperature.

According to some embodiments of the application, the preset temperature difference comprises a first preset temperature difference and a second preset temperature difference, the first preset temperature difference being less than the second preset temperature difference; the rotating speed of the water pump is controlled according to the first water inlet and outlet temperature difference and the preset temperature difference, and the rotating speed comprises one of the following steps:

when the first water inlet and outlet temperature difference is smaller than the first preset temperature difference, increasing the rotating speed of the water pump;

when the first water inlet and outlet temperature difference is larger than or equal to the first preset temperature difference and smaller than or equal to the second preset temperature difference, the rotating speed of the water pump is kept;

and when the temperature difference of the first water inlet and outlet is larger than the second preset temperature difference, reducing the rotating speed of the water pump.

According to some embodiments of the application, the preset temperature difference further comprises a third preset temperature difference, the third preset temperature difference being greater than the second preset temperature difference; the rotating speed of the water pump is controlled according to the first water inlet and outlet temperature difference and the preset temperature difference, and the method further comprises the following steps:

and when the temperature difference of the first water inlet and outlet is larger than the third preset temperature difference, controlling the water pump to operate at the maximum rotating speed.

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

When the exhaust temperature is higher than a second preset exhaust temperature, controlling the water pump to operate at a maximum rotation speed;

and executing the control of the rotation speed of the water pump according to the exhaust temperature, the water inlet temperature and the water outlet temperature until the exhaust temperature is reduced and is smaller than a third preset exhaust temperature, wherein the third preset exhaust temperature is smaller than the second preset exhaust temperature.

According to some embodiments of the application, the outlet water temperature further comprises a second outlet water temperature of an outlet water end of the second heat exchange circuit; the controlling the frequency of the compressor according to the water inlet temperature, the water outlet temperature and a preset temperature difference interval comprises the following steps:

calculating a second inlet-outlet water temperature difference between the second outlet water temperature and the inlet water temperature;

and controlling the frequency of the compressor according to the second water inlet and outlet temperature difference and a preset temperature difference interval.

According to some embodiments of the application, the controlling the frequency of the compressor according to the second inlet-outlet water temperature difference and a preset temperature difference interval includes one of the following:

when the second water inlet and outlet temperature difference is positioned in the first temperature difference zone, the frequency of the compressor is not limited;

when the second water inlet and outlet temperature difference is located in a second temperature difference interval, the frequency of the compressor is increased, wherein the second temperature difference interval is larger than the first temperature difference interval;

When the second inlet and outlet water temperature difference is located in a third temperature difference interval, the frequency of the compressor is kept, wherein the third temperature difference interval is larger than the second temperature difference interval;

and when the second water inlet and outlet temperature difference is positioned in a frequency-reducing temperature difference interval, reducing the frequency of the compressor, wherein the frequency-reducing temperature difference interval is larger than the third temperature difference interval.

According to some embodiments of the application, in the case that the second inlet and outlet water temperature difference is located in a down-conversion temperature difference region, the reducing the frequency of the compressor includes one of:

when the second water inlet and outlet temperature difference is located in a fourth temperature difference interval, reducing the frequency of the compressor according to the first frequency reduction amplitude, wherein the fourth temperature difference interval is larger than the third temperature difference interval;

and when the second water inlet and outlet temperature difference is positioned in a fifth temperature difference interval, reducing the frequency of the compressor according to a second frequency reduction amplitude, wherein the fifth temperature difference interval is larger than the fourth temperature difference interval, and the second frequency reduction amplitude is larger than the first frequency reduction amplitude.

According to some embodiments of the application, in the case that the second inlet and outlet water temperature difference is located in a down-conversion temperature difference interval, the reducing the frequency of the compressor includes:

Acquiring a first frequency lower limit value corresponding to the second water outlet temperature and a second frequency lower limit value corresponding to the outdoor environment temperature;

selecting the maximum value of the first frequency lower limit value and the second frequency lower limit value as a 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.

According to some embodiments of the application, the controlling the frequency of the compressor according to the second inlet-outlet water temperature difference and a preset temperature difference interval includes:

acquiring the minimum frequency and the maximum frequency of the allowable operation of the compressor and the total number of gears of the compressor;

controlling the operation gear of the compressor according to the second water inlet and outlet temperature difference and a preset temperature difference interval;

and determining the frequency of the compressor according to the running gear, the total number of gears, the lowest frequency and the highest frequency.

In a second aspect, an embodiment of the present application provides a multiple on-line heat pump system, including: the control method of the multi-split heat pump system comprises a memory, a processor and a computer program, wherein the computer program is stored in the memory and can be run on the processor, and the control method of the multi-split heat pump system of the first aspect is executed when the processor runs the computer program.

In a third aspect, an embodiment of the present application provides a computer readable storage medium storing computer executable instructions for performing the control method of the multi-online heat pump system according to the first aspect.

According to the technical scheme provided by the embodiment of the application, the method has at least the following beneficial effects: for the multi-split heat pump system provided with the hydraulic module, the embodiment of the application can acquire the exhaust temperature of the compressor and the water inlet temperature and the water outlet temperature of the hydraulic module; the embodiment of the application can control the rotating speed of the water pump according to the exhaust temperature, the water inlet temperature and the water outlet temperature, and control the frequency of the compressor according to the water inlet temperature, the water outlet temperature and a preset temperature difference interval. Firstly, the embodiment of the application can control the water inlet and outlet temperature difference by adjusting the rotation speed of the water pump and the frequency of the compressor, and can prevent the conditions of overlarge water inlet and outlet temperature difference and higher water outlet temperature caused by overhigh frequency and small water flow; secondly, the embodiment of the application also combines the exhaust temperature of the compressor to control the rotating 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 application also presets a temperature difference interval, and can reasonably control the interval based on the water inlet and outlet temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.

FIG. 1 is a schematic diagram of a system architecture platform for implementing a control method of a multi-split heat pump system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of an overall structure of a multi-split heat pump system according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a hydraulic module in a multi-split heat pump system according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an auxiliary heating device in a multi-split heat pump system according to an embodiment of the present application;

FIG. 5 is a flow chart of steps of a control method of a multi-split heat pump system according to an embodiment of the present application;

FIG. 6 is a flow chart of steps of a control method of a multi-split heat pump system according to another embodiment of the present application;

FIG. 7 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 8 is a flow chart of steps of a control method of a multi-split heat pump system according to another embodiment of the present application;

FIG. 9 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 10 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 11 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 12 is a flow chart of steps of a control method of a multi-split heat pump system according to another embodiment of the present application;

FIG. 13 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 14 is a flow chart of steps of a control method of a multi-split heat pump system according to another embodiment of the present application;

FIG. 15 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 16 is a flow chart of steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 17 is a flow chart of steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 18 is a flow chart of steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 19 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 20 is a flowchart illustrating steps of a method for controlling a multi-split heat pump system according to another embodiment of the present application;

FIG. 21 is a flowchart illustrating steps of a method for controlling a multiple on-line heat pump system according to another embodiment of the present application;

FIG. 22 is a schematic diagram of a plurality of temperature differential zones provided by one embodiment of the present application.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the description of the present application, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In some cases, in order to improve the temperature adjustment capability of the heat pump system to the indoor environment, a hydraulic module and an auxiliary heating device may be optionally added to the heat pump system. For the heat pump system, when the temperature difference between the water inlet and the water outlet of the hydraulic module is too large, the water is generally detected to be lack by means of a water flow switch for protection, and the problems that the water inlet and outlet temperature difference is too large and the water outlet temperature is too high are difficult to be solved more reliably.

Based on the above situation, the embodiment of the application provides a multi-split heat pump system, a control method thereof and a computer readable storage medium, aiming at improving the reliability of the multi-split heat pump system.

Embodiments of the present application will be further described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic diagram of a system architecture platform for executing a control method of a multi-split heat pump system according to an embodiment of the present application.

The system architecture platform 100 of the present embodiment includes one or more processors 110 and a memory 120, and in fig. 1, one processor 110 and one memory 120 are taken as an example.

The processor 110 and the memory 120 may be connected by a bus or otherwise, which is illustrated in FIG. 1 as a bus connection.

Memory 120, as a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. In addition, memory 120 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some implementations, the memory 120 optionally includes memory 120 remotely located relative to the processor 110, which may be connected to the system architecture platform 100 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Those skilled in the art will appreciate that the device structure shown in fig. 1 is not limiting of the system architecture platform 100 and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.

In the system architecture platform 100 shown in fig. 1, the processor 110 may be configured to invoke a control program of the multi-split heat pump system stored in the memory 120, thereby implementing a control method of the multi-split heat pump system.

Based on the hardware structure of the system architecture platform 100, various embodiments of the multi-online heat pump system of the present application are presented.

As shown in fig. 2 to 4, fig. 2 is a schematic diagram of an overall structure of a multi-split heat pump system according to an embodiment of the present application; FIG. 3 is a schematic diagram of a hydraulic module in a multi-split heat pump system according to an embodiment of the present application; fig. 4 is a schematic structural diagram of an auxiliary heating device in a multi-split heat pump system according to an embodiment of the present application.

In an 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 exchanges heat with the second heat exchange circuit 330, the first heat exchange circuit 320 and the outdoor unit 200 are in communication, and the water pump 310 and the second heat exchange circuit 330 are in communication.

In an embodiment, the multi-split heat pump system of the present application further includes, but is not limited to, an indoor unit 400, the indoor unit 400 including one or more air conditioning indoor units 410; in addition, the outdoor unit 200 in the multi-split heat pump system according to the embodiment of the present application further 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 conditioner indoor unit 410 are mutually communicated.

In an embodiment, the multi-split heat pump system of the present application further includes, but is not limited to, an auxiliary heat device 500, wherein the auxiliary heat device 500 includes a water supply pipeline 510, a water return pipeline 520 and a heat exchange coil assembly 530, the heat exchange coil assembly 530 is used for assisting in heating the indoor environment, the heat exchange coil assembly 530 is communicated with the water supply pipeline 510 and the water return pipeline 520, and the water supply pipeline 510 and the water return pipeline 520 are both communicated with the second heat exchange circuit 330.

Wherein, in order to better prevent the layering phenomenon of the indoor environment temperature, for example: the upper layer (the area close to the ceiling) has a higher temperature, but the lower layer (the living area) has a lower temperature; the auxiliary heating apparatus 500 may be disposed at a lower floor (living area), such as a wall surface and/or a floor surface of an indoor environment, so long as the heat exchange between the auxiliary heating apparatus 500 and the lower space of the indoor environment is facilitated. It should be noted that the first heat exchanging coil 531 of the heat exchanging coil assembly 530 may be a coil-shaped heat exchanger. It will be appreciated that it is generally a helical tubing, such as a disc-shaped aluminium plastic tube; such as floor heating coil panels mounted in a zigzag fashion, etc. The heat exchanger can be a device for realizing heat transfer between two or more fluids with different temperatures, and can transfer heat from a fluid with a higher temperature to a fluid with a lower temperature (or from a fluid with a lower temperature to a fluid with a higher temperature), so that the temperature of the fluid reaches the index specified by the flow, thereby meeting the requirements of process conditions and improving the energy utilization rate. A heat exchange coil is thus understood to mean a device in the form of a spiral for effecting heat transfer between materials between two or more fluids of different temperatures.

It should be noted that, heat exchange media (refrigerant, water or other heat conducting media, hereinafter, the technical scheme of the present application is described by using the heat exchange media as water) may be disposed in the second heat exchange loop 330, the water supply pipeline 510, the water return pipeline 520 and the heat exchange coil assembly 530, so that after the heat exchange between the second heat exchange loop 330 and the first heat exchange loop 320, the heat exchange media flow in the second heat exchange loop 330, the water supply pipeline 510, the water return pipeline 520 and the heat exchange coil assembly 530, thereby realizing heat exchange.

In addition, the heat exchange between the first heat exchange circuit 320 and the second heat exchange circuit 330 in the hydraulic module 300 may be performed by any means selected from heat conduction, heat convection and heat radiation, so long as the heat exchange between the first heat exchange circuit 320 and the second heat exchange circuit 330 can be performed in a short time. In an embodiment, the first heat exchange circuit 320 and the second heat exchange circuit 330 may adopt a heat conduction manner, specifically, the heat of the first heat exchange circuit 320 may be transferred to the second heat exchange circuit 330 by directly contacting the first heat exchange circuit 320 with the second heat exchange circuit 330 or through an intermediate heat conducting medium. The heat conduction mode is adopted, so that the heat transfer can be more convenient, and the production cost is convenient to reduce.

In one embodiment, the return line 520 is provided with an automatic water replenishment valve 540. When the heat exchange medium in the pipeline is subjected to heat exchange, the heat exchange medium can be reduced due to evaporation or other reasons, the automatic water supplementing valve 540 can ensure that the heat exchange medium is sufficient, the first heat exchange coil 531 is ensured to have enough heat exchange medium for indoor environment, and the heat exchange efficiency is ensured.

In the heating mode, the refrigerant enters the air conditioner indoor unit 410 from the output end of the compressor 210, exchanges heat with the indoor environment in the air conditioner indoor unit 410, enters the outer heat exchanger 220, and then flows into the input end of the compressor 210 from the outer heat exchanger 220. Then, the refrigerant flows out of the output end of the compressor 210 and flows into the first heat exchange circuit 320 of the hydraulic module 300, and the temperature of the first heat exchange circuit 320 increases. The 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 end of the compressor 210. At this time, the second heat exchange circuit 330 obtains the heat of the first heat exchange circuit 320. The heated second heat exchange loop 330 heats the water supply pipeline 510 connected thereto, and the water supply pipeline 510 heats the heat exchange coil assembly 530 of the auxiliary heat device 500, so that the heat exchange coil assembly 530 can be used for auxiliary heating of the indoor environment, and the heat exchange medium flows back to the second heat exchange loop 330 through the water return pipeline 520 for the next heating cycle. Because the indoor air conditioner 410 and the auxiliary heating device 500 are simultaneously adopted to heat the indoor environment during the heating mode, the temperature of the indoor environment is uniformly increased. Therefore, the embodiment of the application can improve the temperature rising capability of the multi-split system to the indoor environment and prevent the temperature layering phenomenon of the indoor environment.

In one embodiment, the heat exchange coil assembly 530 includes a plurality of first heat exchange coils 531, each of the plurality of first heat exchange coils 531 being in communication with the water feed line 510 and the water return line 520. Providing a plurality of first heat exchanging coils 531 may increase the contact area of the heat exchanging coil assembly 530 with the indoor environment, thereby improving heat exchanging efficiency to the indoor environment. It can be appreciated that the plurality of first heat exchange coils 531 may be connected in series, or in parallel, in this embodiment, the plurality of first heat exchange coils 531 are connected in parallel, so that the first heat exchange coils 531 may be heated independently in parallel, which is more convenient for the user to control, and the parallel arrangement may enable the plurality of first heat exchange coils 531 to heat up simultaneously (unlike the series connection, which needs to be heated sequentially), which improves the heat exchange efficiency. And an electric actuator 532 for controlling water inflow can be further arranged at the inlet end of the first heat exchange coil 531, so that a user can control the rate of heat exchange medium entering the first heat exchange coil 531 through the electric actuator 532, and further control the temperature rise temperature and the temperature rise efficiency of the indoor environment, and the electric water heater is convenient to use.

In some embodiments of the present application, heat exchange coil assembly 530 further comprises a water separator 533 and a water collector 534, wherein water separator 533 is in communication with water feed line 510, water collector 534 is in communication with water return line 520, the water inlet end of first heat exchange coil 531 is in communication with water separator 533, and the water outlet end of first heat exchange coil 531 is in communication with water collector 534. The water separator 533 is arranged to enable the water inlet end of the heat exchange coil assembly 530 to always have a certain water pressure, so that when the electric actuator 532 controls water inlet, the water can be supplemented for the first heat exchange coil 531 at the first time, and the heat exchange efficiency of the first heat exchange coil 531 is ensured. And, through setting up the water collector 534 that communicates with the play water end of first heat transfer coil 531, when electric actuator 532 control intakes, the water in the first heat transfer coil 531 can directly get into water collector 534 to be convenient for first time for first heat transfer coil 531 supplements heat transfer medium, guarantees heat transfer coil's heat exchange efficiency.

In one embodiment, the multi-split system further includes a communication pipe that communicates the water separator 533 and the water collector 534, and a bypass valve 535 is provided on the communication pipe. The water collector 534 is communicated with the water separator 533, so that the water supply pipeline 510 and the water return pipeline 520 can circulate without passing through the first heat exchange coil 531, the circulation loop of the heat exchange medium in the water supply pipeline 510, the water separator 533, the water collector 534, the water return pipeline 520 and the second heat exchange loop 330 is smooth, the heat exchange medium in the multi-split system can keep higher temperature all the time, the first heat exchange coil 531 is convenient to heat up in time, and the heat exchange efficiency for indoor environment is improved. It will be appreciated that both the water separator 533 and the water collector 534 are provided with a receiving chamber for receiving a heat transfer medium, thereby facilitating the receiving of the heat transfer medium.

In one embodiment, the multi-split system further includes a water tank 550, wherein the water tank 550 is disposed on the water supply line 510. In a use state, the water tank 550 is communicated with the water supply pipeline 510, that is, water flowing out of the second heat exchange circuit 330 enters the water tank 550 for storage, and then flows out of the water tank 550 for heat exchange of the indoor environment, so that hot water after heat exchange of the second heat exchange circuit 330 is stored, when insufficient hot water supply is ensured, hot water supply can be complemented, heating efficiency of the first heat exchange coil 531 is further ensured, and heat exchange efficiency of the multi-split air conditioner system to the indoor environment is ensured.

In one embodiment, the multi-split system further includes a second heat exchange coil 551 for heating the liquid in the water tank 550, the water inlet end of the second heat exchange coil 551 is in communication with the water supply line 510, and the outflow section of the second heat exchange coil 551 is in communication with the water return line 520. In another use state, the water tank 550 is not communicated with the water supply pipeline 510 (i.e., the heat exchange medium inside the water supply pipeline 510 cannot flow into the water tank 550 for storage), but the water tank 550 is heated by arranging the second heat exchange coil 551 communicated with the water supply pipeline 510, so that water with higher cleanliness (or other liquid to be heated) can be stored in the water tank 550, and the functionality of the water tank 550 is improved.

In one embodiment, the second heat exchange coil 551 is disposed through the water tank 550 and at least partially disposed within the water tank 550; it will be appreciated that the wall of the tank 550 is provided with mounting holes for the second heat exchange coil 551 to extend into and out of, and the mounting holes are further provided with waterproof joints to ensure that the tank 550 remains well sealed when the second heat exchange coil 551 is mounted to the tank 550. The second heat exchange coil 551 stretches into the water tank 550, so that the liquid to be heated contained in the water tank 550 can be directly heated, the heating mode of direct heat exchange can enable the heating rate of the liquid to be heated to be faster, heat consumption is reduced, and the heat exchange rate is improved. In an embodiment, the water tank 550 may also be connected to a water replenishing device, so that when the water tank 550 needs to be replenished with water, the water tank 550 is replenished with water, and the water in the water tank 550 is ensured to be sufficient.

In one embodiment, the second heat exchanging coil 551 is sleeved on the outer wall surface of the water tank 550. The arrangement can also heat the water tank 550 better, and the stability of the structure of the water tank 550 is ensured and the production cost is reduced because the structure of the water tank 550 is not required to be changed.

In one embodiment, the multi-split system further comprises a water spraying device 552 communicated with the water tank 550, and a water return pump 553 is arranged on a pipeline of the water spraying device 552 which is in backflow with the water tank 550; the water spraying device 552 may be provided to allow a user to spray water from the water tank 550. In one embodiment, the water spraying device 552 may include a shower head so that the user may take a shower using the water from the water tank 550. And, through setting up the water return pump 553 at the pipeline that water jet equipment 552 backward flow was in water tank 550, make when using water jet equipment 552, can take the water in the water tank 550 through water return pump 553, when not needing to use, can take out the water in the water jet equipment 552 through water return pump 553 (can close the water inlet of water jet equipment 552 at this moment), prevent the water accumulation in the water jet equipment 552, improve the life of water jet equipment 552.

In an embodiment, the multi-split system further includes a three-way valve 554, a water inlet of the three-way valve 554 is connected to the water supply pipeline 510, a first water outlet of the three-way valve 554 is connected to a water inlet of the second heat exchange coil 551, and a second water outlet of the three-way valve 554 is connected to a water inlet of the first heat exchange coil 531. The three-way valve 554 is arranged on the water supply pipeline 510, so that the water supply pipeline 510 can supply heat for the first heat exchange coil 531 alone or supply heat for the second heat exchange coil 551 alone, thereby facilitating the centralized use of heat of the heat exchange medium by a user, avoiding the heat exchange medium from flowing into a place which does not need to be heated by the user, and improving the heat exchange efficiency of the multi-split air conditioner system.

In some embodiments of the present application, a water temperature sensor 555 is provided within the water tank 550; the water temperature sensor 555 can be a water temperature sensor, and a thermistor is arranged in the water temperature sensor, so that the temperature of water in the water tank 550 can be sensed well, and the temperature and the use in the water tank 550 can be controlled conveniently by a user.

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 communicating the inlet section and the outlet section, the heat exchange section being configured to exchange heat with the second heat exchange circuit 330.

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 is communicated with the water inlet pipeline and the water outlet pipeline, the water inlet pipeline is communicated with the water return pipeline 520, and the water outlet pipeline is communicated with the water supply pipeline 510.

In one embodiment, the water outlet line is provided with an expansion tank 380, a pressure relief valve 340, an exhaust valve 370, a water flow switch 350, and a waterway heater 360 in the water outlet direction. So set up, the heat transfer medium of second heat transfer circuit 330 of being convenient for flows out more smoothly to guarantee the stability of water outlet pipe way, improve many on-line systems's heat exchange efficiency.

Based on the 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 are provided.

As shown in fig. 5, fig. 5 is a flowchart of a control method of a multi-split heat pump system according to an embodiment of the present application. The 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.

Step S510, obtaining the exhaust temperature of the compressor and the water inlet temperature and the water outlet temperature of the hydraulic module;

step S520, controlling the rotation speed of the water pump according to the exhaust temperature, the inlet water temperature and the outlet water temperature;

and step S530, controlling the frequency of the compressor according to the inlet water temperature, the outlet water temperature and a preset temperature difference interval.

In an embodiment, the temperature sensor can be used for respectively acquiring the exhaust temperature of the compressor and the water inlet temperature and the water outlet temperature of the hydraulic module, then the embodiment of the application can increase, decrease or keep the rotating speed of the water pump according to the exhaust temperature, the water inlet temperature and the water outlet temperature, and can increase, decrease or keep the frequency of the compressor according to the water inlet temperature, the water outlet temperature and a preset temperature difference interval.

Notably, the embodiment of the application can control the water inlet and outlet temperature difference by adjusting the rotation speed of the water pump and the frequency of the compressor, and can prevent the conditions of overlarge water inlet and outlet temperature difference and higher water outlet temperature caused by overhigh frequency and small water flow; secondly, the embodiment of the application also combines the exhaust temperature of the compressor to control the rotating 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 application also presets a temperature difference interval, and can reasonably control the interval based on the water inlet and outlet temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

In addition, as shown in fig. 6, fig. 6 is a flowchart of a control method of the multi-split heat pump system according to another embodiment of the present application. The water outlet temperature comprises a first water outlet temperature of a water outlet end of the waterway heater; regarding the control of the rotation speed of the water pump according to the exhaust temperature, the inlet water temperature, and the outlet water temperature in the above step S520, there may be included, but not limited to, the steps S610 and S620.

Step S610, calculating a first inlet-outlet water temperature difference between a first outlet water temperature and an inlet water temperature;

and step S620, controlling the rotating speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference.

In an embodiment, the embodiment of the application can calculate the first water inlet-outlet temperature difference between the first water outlet temperature and the water inlet temperature, and then increase, decrease or maintain the rotation speed of the water pump based on the exhaust temperature and the first water inlet-outlet temperature difference.

In addition, as shown in fig. 7, fig. 7 is a flowchart of a control method of the multi-split heat pump system according to another embodiment of the present application. Regarding the control of the rotation speed of the water pump according to the exhaust temperature and the first inlet and outlet water temperature difference in the above-described step S620, there may be included, but not limited to, the steps S710 and S720.

Step S710, when the exhaust temperature is less than the first preset exhaust temperature;

And step S720, controlling the rotating speed of the water pump according to the first water inlet and outlet temperature difference and a preset temperature difference, wherein the preset temperature difference is determined by the water inlet temperature.

In an embodiment, when the exhaust temperature is smaller than a first preset exhaust temperature, the embodiment of the application compares the first inlet-outlet water temperature difference with a preset temperature difference, and then controls the rotation speed of the water pump according to the comparison result.

It should be noted that, regarding the above-mentioned preset temperature difference, it can be determined from the inlet water temperature; in addition, the present application is not particularly limited to the specific values of the above-mentioned preset temperature difference.

In addition, it should be noted that, regarding the above-mentioned first preset exhaust temperature, the value of the first preset exhaust temperature is not particularly limited, and may be 85 ℃, 100 ℃, or other temperature values.

It should be noted that, in the case where the preset temperature difference includes the first preset temperature difference and the second preset temperature difference, and the first preset temperature difference is smaller than the second preset temperature difference, the controlling the rotation speed of the water pump according to the first inlet-outlet water temperature difference and the preset temperature difference in the step S720 may include, but is not limited to, three implementation cases in fig. 8 to 10, specifically as follows:

As shown in fig. 8, fig. 8 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S720, there may be included, but not limited to, step S810 and step S820.

Step 810, when the first water inlet-outlet temperature difference is smaller than a first preset temperature difference;

step S820, increasing the rotation speed of the water pump.

As shown in fig. 9, fig. 9 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S720, there may be included, but not limited to, step S910 and step S920.

Step S910, when the first water inlet-outlet temperature difference is greater than or equal to a first preset temperature difference and less than or equal to a second preset temperature difference;

step S920, maintaining the rotation speed of the water pump.

As shown in fig. 10, fig. 10 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S720, there may be included, but not limited to, step S1010 and step S1020.

Step S1010, when the temperature difference of the first water inlet and outlet is larger than the second preset temperature difference;

step S1020, reducing the rotation speed of the water pump.

In an embodiment, if the first water inlet-outlet temperature difference is smaller than the first preset temperature difference, the embodiment of the application can respond to increase the rotating speed of the water pump; if the first water inlet and outlet temperature difference is between the first preset temperature difference and the second preset temperature difference, the embodiment of the application can respond to the maintenance of the rotating speed of the water pump; if the first water inlet-outlet temperature difference is larger than the second preset temperature difference, the embodiment of the application can respond to the reduction of the rotating speed of the water pump.

In addition, it should be noted that, regarding the values of the first preset temperature difference and the second preset temperature difference, the embodiment of the present application is not limited thereto.

In addition, as shown in fig. 11, fig. 11 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. In the case 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, the controlling the rotation speed of the water pump according to the first inlet-outlet water temperature difference and the preset temperature difference in the above step S720 may further include, but is not limited to, step S1110 and step S1120.

Step S1110, when the first water inlet-outlet temperature difference is larger than the third preset temperature difference;

and S1120, controlling the water pump to operate at the maximum rotation speed.

In an embodiment, a third preset temperature difference can be set in the embodiment of the application, and if the first water inlet and outlet temperature difference is greater than the third preset temperature difference, the embodiment of the application can control the water pump to operate at the maximum rotation speed without limitation.

It should be noted that, regarding the value of the third preset temperature difference, the embodiment of the present application is not limited thereto.

In addition, as shown in fig. 12, fig. 12 is a flowchart of a control method of the multi-split heat pump system according to another embodiment of the present application. The control method according to the embodiment of the present application may further include, but is not limited to, step S1210 and step S1220 before performing the above step S520.

Step S1210, when the exhaust temperature is greater than the second preset exhaust temperature, controlling the water pump to operate at the maximum rotation speed;

step S1220, until the exhaust temperature decreases and is less than a third preset exhaust temperature, performing control of the rotational speed of the water pump according to the exhaust temperature, the inlet water temperature and the outlet water temperature, wherein the third preset exhaust temperature is less than the second preset exhaust temperature.

In one embodiment, the water pump immediately outputs at a maximum rotational speed when the exhaust temperature is greater than a second preset exhaust temperature. Once the control is entered, the release is performed after the exhaust temperature is less than the third preset exhaust temperature, and the normal control is shifted to.

It should be noted that, regarding the value of the second preset exhaust temperature, the embodiment of the present application is not limited thereto.

In addition, as shown in fig. 13, fig. 13 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. The water outlet temperature also comprises a second water outlet temperature of the water outlet end of the second heat exchange loop; regarding the control of the frequency of the compressor according to the inlet water temperature, the outlet water temperature and the preset temperature difference interval in the above step S530, there may be included, but not limited to, steps S1310 and S1320.

Step S1310, calculating a second inlet-outlet water temperature difference between a second outlet water temperature and an inlet water temperature;

step S1320, controlling the frequency of the compressor according to the second inlet-outlet water temperature difference and a preset temperature difference interval.

In an embodiment, the embodiment of the application can calculate the second water inlet-outlet temperature difference between the second water outlet temperature and the water inlet temperature, then compare the second water inlet-outlet temperature difference with a preset temperature difference interval, and increase, decrease or maintain the frequency of the compressor according to the comparison result.

It should be noted that, regarding the preset temperature difference interval, there may be one or a plurality of preset temperature difference intervals, and the number of preset temperature difference intervals is not particularly limited in the embodiment of the present application.

It should be noted that, regarding the controlling the frequency of the compressor according to the second inlet-outlet water temperature difference and the preset temperature difference interval in the above step S1320, the four implementation cases in fig. 14 to 17 may include, but are not limited to, the following specific embodiments respectively:

as shown in fig. 14, fig. 14 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S1320, there may be included, but not limited to, step S1410 and step S1420.

Step S1410, when the second inlet and outlet water temperature difference is located in the first temperature difference region;

Step S1420, does not limit the frequency of the compressor.

As shown in fig. 15, fig. 15 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S1320, there may be included, but not limited to, step S1510 and step S1520.

Step S1510, when the second inlet and outlet water temperature difference is located in a second temperature difference interval, wherein the second temperature difference interval is larger than the first temperature difference interval;

step S1520, raising the frequency of the compressor.

As shown in fig. 16, fig. 16 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S1320, there may be included, but not limited to, step S1610 and step S1620.

Step S1610, when the second inlet and outlet water temperature difference is located in a third temperature difference interval, wherein the third temperature difference interval is larger than the second temperature difference interval;

step S1620, maintaining the frequency of the compressor.

As shown in fig. 17, fig. 17 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S1320, there may be included, but not limited to, step S1710 and step S1720.

Step S1710, when the second water inlet and outlet temperature difference is located in the frequency-reducing temperature difference interval, wherein the frequency-reducing temperature difference interval is greater than the third temperature difference interval;

Step S1720, reducing the frequency of the compressor.

Note that, in the case where the second inlet/outlet water temperature difference is located in the frequency-reducing temperature difference region, the frequency of the compressor may be reduced in the above step S1720, which includes, but is not limited to, two implementation cases in fig. 18 to 19, specifically, the following steps respectively:

as shown in fig. 18, fig. 18 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S1720, there may be included, but not limited to, step S1810 and step S1820.

Step S1810, when the second inlet and outlet water temperature difference is located in a fourth temperature difference interval, wherein the fourth temperature difference interval is larger than the third temperature difference interval;

step S1820, reducing the frequency of the compressor according to the first downshifting amplitude.

As shown in fig. 19, fig. 19 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the above step S1720, there may be included, but not limited to, step S1910 and step S1920.

Step S1910, when the second water inlet and outlet temperature difference is located in a fifth temperature difference interval, wherein the fifth temperature difference interval is larger than the fourth temperature difference interval;

step S1920, reducing the frequency of the compressor according to a second down-conversion amplitude, wherein the second down-conversion amplitude is greater than the first down-conversion amplitude.

In one embodiment, based on the above-mentioned step flow in fig. 14 to 19, it is specifically as follows:

for a first temperature difference interval: the normal operation interval is not limited by the frequency of the compressor; for the second temperature difference interval: in order to slowly raise the frequency of the compressor, the frequency of the compressor is gradually raised; for the third temperature difference interval: to maintain interval, the compressor frequency is maintained; for the fourth temperature difference interval: the frequency of the compressor is slowly reduced in the slow frequency reducing interval; for the fifth temperature difference interval: for the fast down interval, the frequency of the compressor is fast read down.

As shown in fig. 20, fig. 20 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. In the case where the second inlet and outlet water temperature difference is located in the down-conversion temperature difference section, regarding the frequency of the reduced compressor in step S1720 described above, there may be included, but not limited to, steps S2010, S2020, and S2030.

Step S2010, a first frequency lower limit value corresponding to the second water outlet temperature and a second frequency lower limit value corresponding to the outdoor environment temperature are obtained;

step S2020, selecting a maximum value of the first frequency lower limit value and the second frequency lower limit value as the target frequency lower limit value;

Step S2030, decreasing the frequency of the compressor until the frequency of the compressor is equal to the target frequency lower limit value.

In an embodiment, for the slow down interval and the fast down interval, a target frequency lower limit value is set, where the target frequency lower limit value is a maximum value of a first frequency lower limit value corresponding to the second water outlet temperature and a second frequency lower limit value corresponding to the outdoor environment temperature, and when the frequency of the compressor falls to the target frequency lower limit value, the frequency of the compressor remains unchanged.

As shown in fig. 21, fig. 21 is a flowchart of a control method of a multi-split heat pump system according to another embodiment of the present application. Regarding the control of the frequency of the compressor according to the second inlet and outlet water temperature difference and the preset temperature difference section in the above-described step S1320, there may be included, but not limited to, step S2110, step S2120 and step S2130.

Step S2110, obtaining the lowest frequency and the highest frequency of the allowable operation of the compressor and the total number of gears of the compressor;

step S2120, controlling the operation gear of the compressor according to the second water inlet and outlet temperature difference and a preset temperature difference interval;

step S2130, determining the frequency of the compressor based on the operating gear, the total number of gears, the lowest frequency and the highest frequency.

In an embodiment, the embodiment of the application can convert the gear and the frequency of the compressor, so that the frequency of the compressor can be obtained according to the gear, and the gear of the compressor can be obtained according to the frequency.

Based on the control method of the multi-split heat pump system in each embodiment, the following provides an overall embodiment of the control method of the multi-split heat pump system.

In an embodiment, the embodiment of the application comprises direct current water pump control and compressor control, and the specific steps are as follows:

for the direct current water pump control: the direct current water pump is turned on from off, and is operated at the highest rotation speed for a minutes (recommended value is 5 minutes and the range is 1-20 minutes). After the operation is carried out for a minute, the temperature difference between the total outlet water temperature of the hydraulic module of the heat exchanger and the inlet water temperature of the hydraulic module is detected and adjusted once every t1 time (recommended value 40S, range 20-150S). The adjusting action is as follows:

(1) When the exhaust temperature TP < T1 (recommended value 100 ℃, range 85-110 ℃), refer to Table 1 below:

TABLE 1

(2) The value of A shows that when TW_in is more than or equal to 48 ℃, A=7.5, and when TW_in is less than 48 ℃, A=4.5.

(3) When the exhaust temperature TP is more than or equal to 95 ℃, the water pump outputs at the maximum rotation speed immediately. Once this control is entered, it is released after TP < 90 ℃, and normal control is entered.

For compressor control: as shown in fig. 22, five sections are provided, and sections where the difference value of tw_out-tw_in is calculated, where the control of each section is as follows:

(1) Interval one: and the normal operation interval is not limited in frequency.

(2) Interval two: in the slow frequency raising section, TW_out is modified to raise every 4 minutes to the highest frequency in the case of a hydraulic module.

(3) Interval three: and a holding section for holding the compressor frequency.

(4) Interval four: in the slow down frequency interval, the current running frequency is immediately reduced by 1 gear, then 1 gear is reduced every 30 seconds, and the minimum frequency (the two take large values) corresponding to the water outlet temperature and the outdoor environment temperature T4 is reduced, so that the current running frequency is not reduced any more.

(5) Interval five: in the fast frequency-reducing interval, the current running frequency is immediately reduced by 2 steps, then 2 steps are reduced every 30 seconds, and the frequency is reduced to the minimum frequency (the two take large values) corresponding to the water outlet temperature and the outdoor environment temperature T4, so that the frequency is not reduced any more.

Wherein, regarding the association of gear and frequency of the compressor, the following is specific: the gear of the compressor is corresponding to frequency fn=fmin+ (N-1) ×fmax-fmin)/M, wherein fmin is the lowest frequency value of the compressor allowed to operate, and fmax is the highest frequency value of the compressor allowed to operate; m is a frequency gear, an integer, a recommended value of 21 and a range of 18-25 gears; n gear, integer, N is more than or equal to 1 and less than or equal to M; the frequency value of fn and fn+1 corresponding to the common gear N and the gear N+1 is different by 2-8 Hz.

Based on the control method of the multi-split heat pump system in the above embodiments, the following provides each embodiment of the controller, the multi-split heat pump system and the computer readable storage medium of the present application.

In addition, one embodiment of the present application provides a controller including: a processor, a memory, and a computer program stored on the memory and executable on the processor.

The processor and the memory may be connected by a bus or other means.

It should be noted that, the controller in this embodiment may include a processor and a memory in the embodiment shown in fig. 1, which belong to the same inventive concept, so that the processor and the memory have the same implementation principle and beneficial effects, which are not described in detail herein.

The non-transitory 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.

According to the technical scheme of the controller, firstly, the embodiment of the application can control the water inlet and outlet temperature difference by adjusting the rotation speed of the water pump and the frequency of the compressor, and can prevent the conditions of overlarge water inlet and outlet temperature difference and higher water outlet temperature caused by overhigh frequency and overlarge water flow; secondly, the embodiment of the application also combines the exhaust temperature of the compressor to control the rotating 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 application also presets a temperature difference interval, and can reasonably control the interval based on the water inlet and outlet temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

It should be noted that, because the controller of the embodiment of the present application is capable of executing the control method of the multi-split heat pump system of any one of the embodiments, the specific implementation and the technical effect of the controller of the embodiment of the present application may refer to the specific implementation and the technical effect of the control method of the multi-split heat pump system of any one of the embodiments.

In addition, an embodiment of the application also provides a multi-split heat pump system, which comprises the controller of any embodiment.

According to the technical scheme of the multi-split heat pump system, firstly, the embodiment of the application can control the water inlet and outlet temperature difference by adjusting the rotation speed of the water pump and the frequency of the compressor, and can prevent the conditions of overlarge water inlet and outlet temperature difference and higher water outlet temperature caused by overhigh frequency and small water flow; secondly, the embodiment of the application also combines the exhaust temperature of the compressor to control the rotating 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 application also presets a temperature difference interval, and can reasonably control the interval based on the water inlet and outlet temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

It should be noted that, because the multi-split heat pump system of the embodiment of the present application includes the controller of any one of the embodiments, and the controller of any one of the embodiments can execute the control method of the multi-split heat pump system of any one of the embodiments, the specific implementation and the technical effect of the multi-split heat pump system of the embodiment of the present application can refer to the specific implementation and the technical effect of the control method of the multi-split heat pump system of any one of the embodiments.

In addition, an embodiment of the present application further provides a computer readable storage medium, where computer executable instructions are stored, where the computer executable instructions are configured to execute the control method of the multi-online heat pump system. Illustratively, the method steps in fig. 5-21 described above are performed.

According to the technical scheme of the computer readable storage medium, firstly, the embodiment of the application can control the water inlet and outlet temperature difference by adjusting the rotation speed of the water pump and the frequency of the compressor, and can prevent the conditions of overlarge water inlet and outlet temperature difference and higher water outlet temperature caused by overhigh frequency and small water flow; secondly, the embodiment of the application also combines the exhaust temperature of the compressor to control the rotating 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 application also presets a temperature difference interval, and can reasonably control the interval based on the water inlet and outlet temperature difference, thereby improving the reliability and energy efficiency of the multi-split heat pump system.

It should be noted 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 one of the embodiments, the specific implementation and the technical effect of the computer readable storage medium of the embodiment of the present application can refer to the specific implementation and the technical effect of the control method of the multi-split heat pump system of any one of the embodiments.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. 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 tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically include 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.

In the description of embodiments of the present application, unless explicitly stated and limited otherwise, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," "assembled" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, and may also be in communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Although the embodiments of the present application are described above, the present application is not limited to the embodiments which are used for understanding the present application. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is defined by the appended claims.

While the preferred embodiment of the present application has been described in detail, the present application is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit and scope of the present application, and these equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.

Claims

1. The control method of the multi-split heat pump system is characterized in that the multi-split heat pump system comprises an outdoor unit and a hydraulic module, the outdoor unit comprises a compressor, the hydraulic module comprises a water pump, a first heat exchange loop and a second heat exchange loop which exchanges heat with the first heat exchange loop, the first heat exchange loop is communicated with the outdoor unit, and the water pump is communicated with the second heat exchange loop; the control method comprises the following steps:

2. The control method according to claim 1, wherein the hydraulic module further comprises a waterway heater, the water outlet end of the second heat exchange circuit is communicated to the water inlet end of the waterway heater, and the water outlet end of the waterway heater is used for being communicated to an auxiliary heating device; the water outlet temperature comprises a first water outlet temperature of a water outlet end of the waterway heater; the controlling the rotation speed of the water pump according to the exhaust temperature, the inlet water temperature and the outlet water temperature comprises the following steps:

3. The control method according to claim 2, characterized in that the controlling the rotation speed of the water pump according to the exhaust temperature and the first inlet-outlet water temperature difference includes:

4. A control method according to claim 3, wherein the preset temperature difference comprises a first preset temperature difference and a second preset temperature difference, the first preset temperature difference being smaller than the second preset temperature difference; the rotating speed of the water pump is controlled according to the first water inlet and outlet temperature difference and the preset temperature difference, and the rotating speed comprises one of the following steps:

5. The control method of claim 4, wherein the preset temperature difference further comprises a third preset temperature difference, the third preset temperature difference being greater than the second preset temperature difference; the rotating speed of the water pump is controlled according to the first water inlet and outlet temperature difference and the preset temperature difference, and the method further comprises the following steps:

6. The control method according to any one of claims 1 to 5, characterized in that before the control of the rotation speed of the water pump according to the exhaust gas temperature, the intake water temperature, and the outlet water temperature, the control method further comprises:

7. The control method of claim 2, wherein the outlet water temperature further comprises a second outlet water temperature of an outlet water end of the second heat exchange circuit; the controlling the frequency of the compressor according to the water inlet temperature, the water outlet temperature and a preset temperature difference interval comprises the following steps:

8. The control method according to claim 7, wherein the controlling the frequency of the compressor according to the second inlet-outlet water temperature difference and a preset temperature difference interval includes one of:

9. The control method of claim 8, wherein, in the case where the second inlet and outlet water temperature difference is located in a down-conversion temperature difference interval, the reducing the frequency of the compressor includes one of:

10. The control method according to claim 8, wherein, in the case where the second inlet and outlet water temperature difference is located in a down-conversion temperature difference section, the reducing the frequency of the compressor includes:

11. The control method according to any one of claims 7 to 10, characterized in that the controlling the frequency of the compressor according to the second inlet-outlet water temperature difference and a preset temperature difference interval includes:

12. A multi-split heat pump system, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the control method of the multi-split heat pump system according to any one of claims 1 to 11 when the computer program is executed.

13. A computer-readable storage medium, characterized by: computer executable instructions for performing the control method of the multi-split heat pump system according to any one of claims 1 to 11 are stored.