Heat pump unit control method and device, heat pump unit and storage medium

Abstract

The application discloses a heat pump unit control method and device, a heat pump unit and a storage medium. The heat pump unit comprises a water-side heat exchanger and at least two subsystems. Each subsystem comprises a compressor, a four-way valve, a gas-liquid separator and an air-side heat exchanger. Each subsystem is connected with the water-side heat exchanger. The heat pump unit control method comprises the following steps: after the high-pressure protection is triggered when the subsystem is started, it is determined whether the starting opening degree of the expansion valve of the subsystem is less than a preset opening degree; after it is determined that the starting opening degree is less than the preset opening degree, the starting opening degree is increased by a preset increment, and the subsystem is restarted; if the high-pressure protection is still triggered when the subsystem is started after the starting opening degree is increased by the preset increment, the above steps are repeatedly executed until the subsystem is normally operated after being started or until the starting opening degree reaches the preset opening degree. The starting opening degree of the expansion valve is adjusted in a preset range to avoid the high-pressure protection being triggered when the subsystem is started as much as possible, and the use experience of a user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning equipment, in particular to a heat pump unit control method and device, a heat pump unit and a storage medium. BACKGROUND

[0002] The heat pump air conditioning system mainly utilizes the solar energy resources stored in the ground soil, air and water body as cold and heat sources for heat exchange, realizes the purpose of heating and cooling, and is a clean and environmentally friendly renewable resource technology without combustion, smoke exhaust, waste and pollution.

[0003] The existing water source heat pump unit in the fixed frequency heat pump air conditioning unit is usually in the case that the ambient temperature and the water source temperature are relatively high, and part of the subsystems are prone to high pressure protection when starting, which leads to the failure of the unit to be used normally, and affects the user experience. SUMMARY

[0004] The main purpose of the embodiment of the present application is to provide a heat pump unit control method, device, heat pump unit and storage medium, which aims to improve the technical problem that part of the subsystems of the fixed frequency heat pump air conditioning unit in the prior art are prone to high pressure protection, leading to the failure of the subsystems to be used normally.

[0005] The embodiment of the present application provides a heat pump unit control method, the heat pump unit comprising a water-side heat exchanger and at least two subsystems, each subsystem comprising a compressor, a four-way valve, an expansion valve, a gas-liquid separator and an air-side heat exchanger, each subsystem being connected with the water-side heat exchanger, the heat pump unit control method comprising:

[0006] After the subsystem triggers high pressure protection when starting, it is determined whether the starting opening degree of the expansion valve of the subsystem is less than a preset opening degree;

[0007] After it is determined that the starting opening degree is less than the preset opening degree, the starting opening degree is increased by a preset increment, and the subsystem is restarted;

[0008] If the subsystem continues to trigger high pressure protection after the starting opening degree is increased by the preset increment, the above steps are repeatedly executed until the subsystem runs normally after starting or until the starting opening degree reaches the preset opening degree.

[0009] In some embodiments of the present application, the heat pump unit control method further comprises:

[0010] After the opening degree of the expansion valve of the subsystem reaches the preset opening degree, if the subsystem continues to trigger high pressure protection when starting, it is determined whether the fans of all the air-side heat exchangers of the heat pump unit are all in the lowest wind block when starting;

[0011] After determining that all of the fans of the air-side heat exchangers of the heat pump unit are in the lowest wind block, the fans of the air-side heat exchangers of the heat pump unit are closed one by one, and after each fan of the air-side heat exchanger is closed, the subsystem triggering high pressure protection is restarted, until the subsystem triggering high pressure protection can normally operate after being restarted or until only one fan of the air-side heat exchanger of the heat pump unit is in an open state.

[0012] In some embodiments of the present application, the heat pump unit control method further comprises:

[0013] If after closing the fans of the air-side heat exchangers of part of the subsystems, the subsystem triggering high pressure protection can normally operate after being started, then after the subsystem triggering high pressure protection normally operates for a preset time, the closed fan of the air-side heat exchanger is opened.

[0014] In some embodiments of the present application, the heat pump unit control method further comprises:

[0015] After determining that the number of the subsystems triggering high pressure protection in the heat pump unit is less than the total number of the subsystems in the heat pump unit, the fans of the air-side heat exchangers of the subsystems triggering high pressure protection are closed one by one, and after each fan of the air-side heat exchanger is closed, the subsystem triggering high pressure protection is restarted, until the subsystem triggering high pressure protection can normally operate after being restarted or until the fans of the air-side heat exchangers of all of the subsystems triggering high pressure protection in the heat pump unit are closed;

[0016] After the fans of the air-side heat exchangers of all of the subsystems triggering high pressure protection in the heat pump unit are closed, if there is still a subsystem triggering high pressure protection in the heat pump unit that is started, it is determined whether the number of the subsystems not triggering high pressure protection that are started in the heat pump unit is greater than 2;

[0017] After determining that the number of the subsystems not triggering high pressure protection that are started in the heat pump unit is greater than 2, the fans of the air-side heat exchangers of the subsystems not triggering high pressure protection that are started in the heat pump unit are closed one by one, and after each fan of the air-side heat exchanger is closed, the subsystem triggering high pressure protection is restarted, until the subsystem triggering high pressure protection can normally operate after being restarted or until only one fan of the air-side heat exchanger of the heat pump unit is in an open state.

[0018] In some embodiments of the present application, the heat pump unit control method further comprises:

[0019] After determining that the fans of all the air-side heat exchangers of the heat pump unit have not all been set to the lowest wind speed, the fans of the air-side heat exchangers of the heat pump unit that have not been set to the lowest wind speed are adjusted to the lowest wind speed one by one, and after adjusting the fan speed of each air-side heat exchanger, the subsystem that triggers high pressure protection is restarted until the subsystem that triggers high pressure protection can operate normally after being restarted or until the fans of all the air-side heat exchangers of the heat pump unit are set to the lowest wind speed when starting up.

[0020] In some embodiments of the present application, the step of adjusting the fans of the air-side heat exchangers of the heat pump unit that have not been set to the lowest wind speed to the lowest wind speed one by one, and after adjusting the fan speed of each air-side heat exchanger, restarting the subsystem that triggers high pressure protection until the subsystem that triggers high pressure protection can operate normally after being restarted or until the fans of all the air-side heat exchangers of the heat pump unit are set to the lowest wind speed when starting up, comprises:

[0021] After determining that the fans of all the air-side heat exchangers of the heat pump unit have not all been set to the lowest wind speed, the fans of the air-side heat exchangers of the heat pump unit that have not been set to the lowest wind speed are adjusted to the lowest wind speed one by one, and after adjusting the fan speed of each air-side heat exchanger, the subsystem that triggers high pressure protection is restarted until the subsystem that triggers high pressure protection can operate normally after being restarted or until the fans of all the air-side heat exchangers of the heat pump unit are set to the lowest wind speed when starting up.

[0022] After determining that the fans of all the air-side heat exchangers of the heat pump unit have not all been set to the lowest wind speed, the fans of the air-side heat exchangers of the heat pump unit that have not been set to the lowest wind speed are adjusted to the lowest wind speed one by one, and after adjusting the fan speed of each air-side heat exchanger, the subsystem that triggers high pressure protection is restarted until the subsystem that triggers high pressure protection can operate normally after being restarted or until the fans of all the air-side heat exchangers of the heat pump unit are set to the lowest wind speed when starting up.

[0023] In some embodiments of the present application, the heat pump unit control method further comprises:

[0024] After determining that only one fan of the air-side heat exchanger of the heat pump unit is in an open state and the heat pump unit still has the subsystem that triggers high pressure protection when starting up, the mode of the four-way valve of the subsystem that triggers high pressure protection is determined.

[0025] If the four-way valve is in the heating mode, the four-way valve is switched from the heating mode to the cooling mode, and the subsystem is restarted;

[0026] If the four-way valve is in the cooling mode, the four-way valve is switched from the cooling mode to the heating mode, and the subsystem is restarted.

[0027] In some embodiments of the present application, a heat pump unit control device is also provided, comprising:

[0028] An acquisition module is configured to acquire a startup opening degree of an expansion valve of a subsystem of a heat pump unit;

[0029] A judgment module is configured to determine whether the startup opening degree of the subsystem is less than a preset opening degree after the subsystem triggers high-pressure protection during startup;

[0030] A control module is configured to increase the startup opening degree by a preset increment and restart the subsystem after determining that the startup opening degree is less than the preset opening degree; the control module is further configured to repeatedly execute the above steps until the subsystem operates normally after startup or until the startup opening degree reaches the preset opening degree if the subsystem triggers high-pressure protection during startup after the startup opening degree is increased by the preset increment.

[0031] In some embodiments of the present application, a heat pump unit is also provided, comprising a water-side heat exchanger, at least two subsystems, a memory, and a processor, each subsystem comprising a compressor, a four-way valve, an expansion valve, a gas-liquid separator, and an air-side heat exchanger, each subsystem being connected to the water-side heat exchanger, the memory storing a computer program, and the processor being configured to run the computer program in the memory to execute the steps of the heat pump unit control method according to any one of claims 1-7.

[0032] In some embodiments of the present application, a storage medium is also provided, the storage medium storing a computer program, the computer program being loaded and executed by a processor to execute the steps of the heat pump unit control method described above.

[0033] Embodiments of the present application provide a heat pump unit control method, device, heat pump unit, and storage medium. When a subsystem triggers high-pressure protection during startup, the heat pump unit control method detects a startup opening degree of an expansion valve of the subsystem, increases the startup opening degree of the expansion valve step by step when the startup opening degree of the expansion valve does not reach a preset opening degree, adjusts the startup opening degree of the expansion valve within a preset range to avoid the subsystem triggering high-pressure protection during startup as much as possible, and improves user experience. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0035] Figure 1 Flowchart of a heat pump unit control method according to an embodiment of the present application;

[0036] Figure 2 Structure diagram of a heat pump unit control device according to an embodiment of the present application;

[0037] Figure 3 Structure diagram of a heat pump unit according to an embodiment of the present application;

[0038] Figure 4 Structure diagram of a subsystem and a water-side heat exchanger according to an embodiment of the present application.

[0039] The accompanying drawings are as follows: 10, heat pump unit control device; 100, acquisition module; 200, judgment module; 300, control module; 400, water-side heat exchanger; 510, compressor; 520, four-way valve; 530, gas-liquid separator; 540, expansion valve; 550, air-side heat exchanger; 551, fan; 601, processor; 602, storage; 603, power supply; 604, input unit. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0041] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directionality indications also change accordingly.

[0042] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In addition, if the present application involves "first", "second" and the like in the description, the "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0044] As shown in Figures 1-4 The present application provides a heat pump unit control method for controlling a heat pump unit, the heat pump unit comprising a water-side heat exchanger 400 and at least two subsystems, each subsystem comprising a compressor 510, a four-way valve 520, an expansion valve 540, a gas-liquid separator 530 and an air-side heat exchanger 550, each subsystem being connected to the water-side heat exchanger 400, the heat pump unit control method comprising:

[0045] S100, determining whether the opening degree of the expansion valve 540 of the subsystem is less than a preset opening degree after the subsystem triggers high pressure protection during startup.

[0046] Wherein, when the subsystem triggers high pressure protection during startup, the subsystem will be forced to shut down, resulting in the heat exchanger cannot work normally to cool / heat; the opening degree of the expansion valve 540 during startup is the size of the opening degree of the expansion valve 540 when the subsystem starts; the preset opening degree is the size of the opening degree pre-existing in the heat pump unit controller, generally 480 steps.

[0047] S110, increasing the opening degree by a preset increment and restarting the subsystem after determining that the opening degree is less than the preset opening degree.

[0048] The preset increment is an opening increment pre-stored in the controller, for example, the preset increment is 20 steps. After the first time the subsystem triggers the high-pressure protection, if the opening degree of the expansion valve 540 is 110, the opening degree is increased to 130 according to the preset increment, and then the subsystem is restarted.

[0049] S120, if the opening degree is increased according to the preset increment and the subsystem still triggers the high-pressure protection after the subsystem is started, the above steps are repeatedly executed until the subsystem runs normally after being started or until the opening degree reaches the preset opening degree.

[0050] The preset increment is an opening increment pre-stored in the controller, for example, the preset increment is 20 steps. After the first time the subsystem triggers the high-pressure protection, if the opening degree of the expansion valve 540 is 110, the opening degree is increased to 130 according to the preset increment, and then the subsystem is restarted.

[0051] It can be understood that, when the subsystem triggers the high-pressure protection, the heat pump unit control method detects the opening degree of the expansion valve 540 of the subsystem, and gradually increases the opening degree of the expansion valve 540 when the opening degree of the expansion valve 540 does not reach the preset opening degree, so as to avoid the subsystem triggering the high-pressure protection as much as possible when starting, and improve the user experience.

[0052] In some embodiments, after the subsystem triggers the high-pressure protection, the preset opening degree of the expansion valve 540 is determined according to the environmental temperature.

[0053] Specifically, the preset opening degree at a certain environmental temperature can be determined according to the environmental temperature and preset opening degree correspondence table in the controller.

[0054] The environmental temperature and preset opening degree correspondence table can be obtained by simulation software simulation, or can be obtained by the controller collecting working data of the heat pump unit through cloud computing simulation.

[0055] In some embodiments, the heat pump unit control method further comprises:

[0056] S200, after the opening degree of the expansion valve 540 of the subsystem reaches the preset opening degree, if the subsystem still triggers the high-pressure protection after being started, it is determined whether the fans 551 of all the air-side heat exchangers 550 of the heat pump unit are in the lowest air baffle when being started.

[0057] Each subsystem generally has one air-side heat exchanger 550, and each air-side heat exchanger 550 generally has one fan 551 and one fin heat exchanger.

[0058] S300, after determining that the fans 551 of all air-side heat exchangers 550 of the heat pump unit are all in the lowest wind block when starting, the fans 551 of the air-side heat exchangers 550 of the heat pump unit are closed one by one, and after each fan 551 of an air-side heat exchanger 550 is closed, the subsystem triggering high-pressure protection is restarted until the subsystem triggering high-pressure protection can normally operate after being restarted or until only one fan 551 of an air-side heat exchanger 550 of the heat pump unit is in an open state.

[0059] In this embodiment, closing the fan 551 of the air-side heat exchanger 550 means that the fan 551 of the air-side heat exchanger 550 is not started when starting.

[0060] In this embodiment, closing the fan 551 of the air-side heat exchanger 550 can reduce the evaporation pressure of the heat pump unit, thereby helping the subsystems in the heat pump unit to avoid triggering high-pressure protection when starting.

[0061] In this embodiment, when only one fan 551 of an air-side heat exchanger 550 of the heat pump unit is in an open state when starting, if there is still a subsystem in the heat pump unit that will trigger high-pressure protection when starting, the fan 551 of the air-side heat exchanger 550 does not need to be closed.

[0062] In some embodiments, the heat pump unit control method further comprises:

[0063] S500, if the subsystems triggering high-pressure protection can all normally operate after starting after closing the fans 551 of the air-side heat exchangers 550 of part of the subsystems, the closed fans 551 of the air-side heat exchangers 550 are opened after the subsystems triggering high-pressure protection normally operate for a preset time.

[0064] Specifically, when all the subsystems of the heat pump unit can normally operate after starting after closing the fans 551 of part of the air-side heat exchangers 550, the closed fans 551 of the air-side heat exchangers 550 are opened after the subsystems triggering high-pressure protection normally operate for a preset time, so that the subsystems normally operate.

[0065] In this embodiment, the preset time is a length of time pre-stored in the controller, which is generally obtained through simulation tests and stored in the controller.

[0066] In some embodiments, S300, the fans 551 of the air-side heat exchangers 550 of the heat pump unit are closed one by one, and after each fan 551 of the air-side heat exchanger 550 is closed, the high-pressure protection triggering subsystem is restarted, until the high-pressure protection triggering subsystems can all operate normally after being restarted or until only one fan 551 of the air-side heat exchanger 550 of the heat pump unit is in an open state, including:

[0067] S310, after determining that the number of high-pressure protection triggering subsystems in the heat pump unit is less than the total number of subsystems of the heat pump unit, the fans 551 of the air-side heat exchangers 550 of the high-pressure protection triggering subsystems are closed one by one, and after each fan 551 of the air-side heat exchanger 550 is closed, the high-pressure protection triggering subsystem is restarted, until the high-pressure protection triggering subsystems can all operate normally after being restarted or until all the fans 551 of the air-side heat exchangers 550 of the high-pressure protection triggering subsystems of the heat pump unit are closed.

[0068] Wherein, determining that the number of high-pressure protection triggering subsystems in the heat pump unit is less than the total number of subsystems of the heat pump unit, determining that the expansion valve 540 has been adjusted to the preset opening degree at this time, and the number of high-pressure protection triggering subsystems that are started is less than the total number of subsystems of the heat pump unit, that is, at this time, part of the subsystems are normally operating, and part of the subsystems are started to trigger high pressure protection.

[0069] Wherein, when the number of high-pressure protection triggering subsystems in the heat pump unit is less than the total number of subsystems of the heat pump unit at this time, the fans 551 of the high-pressure protection triggering subsystems are preferentially closed, thereby avoiding affecting the subsystems that are already normally operating.

[0070] S320, after all the fans 551 of the air-side heat exchangers 550 of the high-pressure protection triggering subsystems of the heat pump unit are closed, if there are still high-pressure protection triggering subsystems that are started in the heat pump unit, it is determined whether the number of high-pressure protection triggering subsystems that are started in the heat pump unit is greater than 2.

[0071] Wherein, determining whether the number of high-pressure protection triggering subsystems that are started in the heat pump unit is greater than 2, the main purpose is to determine whether the fans 551 of the air-side heat exchangers 550 of the heat pump unit can continue to be closed.

[0072] S330, after determining that the number of high-pressure protection triggering subsystems that are started in the heat pump unit is greater than 2, the fans 551 of the air-side heat exchangers 550 of the high-pressure protection triggering subsystems that are started in the heat pump unit are closed one by one, and after each fan 551 of the air-side heat exchanger 550 is closed, the high-pressure protection triggering subsystem is restarted, until the high-pressure protection triggering subsystems can all operate normally after being restarted or until only one fan 551 of the air-side heat exchanger 550 of the heat pump unit is in an open state.

[0073] That is, by closing the fan 551 of the subsystem triggering high pressure protection first, and then closing the fan 551 of the subsystem not triggering high pressure protection, the normal operation of the subsystem not triggering high pressure protection is avoided as much as possible.

[0074] In some embodiments, the heat pump unit control method further comprises:

[0075] S400, when it is determined that all the fans 551 of the air-side heat exchangers 550 of the heat pump unit have not all been at the lowest wind stop, gradually adjust the fan 551 of the air-side heat exchanger 550 of the heat pump unit not at the lowest wind stop to the lowest wind stop one by one, and after adjusting the fan 551 of each air-side heat exchanger 550, restart the subsystem triggering high pressure protection, until the subsystem triggering high pressure protection can operate normally after restarting or until all the fans 551 of the air-side heat exchangers 550 of the heat pump unit are at the lowest wind stop when starting.

[0076] That is, when it is determined that all the fans 551 of the heat pump unit have not all been at the lowest wind stop, gradually adjust the fan 551 to the lowest wind stop one by one to reduce the evaporation pressure of the heat pump unit, and then enable the subsystem triggering high pressure protection to operate normally.

[0077] In some embodiments, S400, gradually adjust the fan 551 of the air-side heat exchanger 550 of the heat pump unit not at the lowest wind stop to the lowest wind stop one by one, and after adjusting the fan 551 of each air-side heat exchanger 550, restart the subsystem triggering high pressure protection, until the subsystem triggering high pressure protection can operate normally after restarting or until all the fans 551 of the air-side heat exchangers 550 of the heat pump unit are at the lowest wind stop when starting, comprising:

[0078] S410, after it is determined that all the fans 551 of the air-side heat exchangers 550 of the subsystem triggering high pressure protection have not all been at the lowest wind stop, gradually adjust the fan 551 of the air-side heat exchanger of the subsystem triggering high pressure protection to the lowest wind stop one by one, and after adjusting the fan 551 of each air-side heat exchanger 550, restart the subsystem triggering high pressure protection, until the subsystem triggering high pressure protection can operate normally after restarting or until all the fans 551 of the air-side heat exchangers 550 of the subsystem triggering high pressure protection are at the lowest wind stop.

[0079] Among them, the subsystem triggering high pressure protection in "after it is determined that all the fans 551 of the air-side heat exchangers 550 of the subsystem triggering high pressure protection have not all been at the lowest wind stop" refers to the subsystem triggering high pressure protection that has been started while the expansion valve 540 has been at the maximum opening.

[0080] S420, after determining that the fans 551 of the air-side heat exchangers 550 of all the subsystems triggering high-pressure protection are all at the lowest wind barrier, the fans 551 of the air-side heat exchangers 550 of the subsystems not triggering high-pressure protection are adjusted to the lowest wind barrier one by one, and after adjusting the gear of the fan 551 of each air-side heat exchanger 550, the subsystem triggering high-pressure protection is restarted until the subsystem triggering high-pressure protection can operate normally after being restarted or until the fans 551 of the air-side heat exchangers 550 of all the subsystems of the heat pump unit are started and are all at the lowest wind barrier

[0081] It can be understood that, in the case that the fans 551 of the air-side heat exchangers 550 of the subsystems triggering high-pressure protection are not all adjusted to the lowest wind barrier, the fans 551 of the air-side heat exchangers 550 of the subsystems triggering high-pressure protection are preferentially adjusted to the lowest wind barrier to avoid affecting the normal operation of the subsystems not triggering high-pressure protection, and if the fans 551 of the air-side heat exchangers 550 of the subsystems triggering high-pressure protection have all been adjusted to the lowest wind barrier, the fans 551 of the air-side heat exchangers 550 of the subsystems not triggering high-pressure protection are then adjusted to the lowest wind barrier one by one to minimize the impact on the subsystems operating normally.

[0082] In some embodiments, the heat pump unit control method further comprises:

[0083] S600, in the case that the heat pump unit only retains one fan 551 of the air-side heat exchanger 550 in the open state and the heat pump unit still has a subsystem triggering high-pressure protection when starting, the mode of the four-way valve 520 of the subsystem triggering high-pressure protection is determined.

[0084] The four-way valve 520 has two general communication modes, i.e., a refrigeration mode and a heating mode. In the heating mode, the four-way valve 520 makes the gas outlet of the compressor 510 communicate with the water-side heat exchanger 400 and the gas return port of the compressor 510 communicate with the air-side heat exchanger 550. In the heating mode, the four-way valve 520 makes the gas outlet of the compressor 510 communicate with the air-side heat exchanger 550 and the gas return port of the compressor 510 communicate with the water-side heat exchanger 400.

[0085] S610, if the four-way valve 520 is in the heating mode, the four-way valve 520 is switched from the heating mode to the refrigeration mode, and the subsystem is restarted.

[0086] S620, if the four-way valve 520 is in the refrigeration mode, the four-way valve 520 is switched from the refrigeration mode to the heating mode, and the subsystem is restarted.

[0087] That is, when the expansion valve 540 and the closed fan 551 cannot make the high-pressure protection triggered ear subsystem work normally, the four-way valve 520 is switched between the heating mode and the cooling mode, so that the high-pressure protection triggered subsystem is started to avoid the heat pump unit part subsystem being in a state of being unable to use.

[0088] After the high-pressure protection triggered subsystem runs normally for a certain period of time, the four-way valve 520 mode of the subsystem is switched to the initial mode.

[0089] In some embodiments, the present application also provides a heat pump unit control device 10, comprising an acquisition module 100, a judgment module 200 and a control module 300. The acquisition module 100 is used to acquire the startup opening degree of the expansion valve 540 of the subsystem of the heat pump unit. The judgment module 200 is used to determine whether the startup opening degree of the subsystem is less than the preset opening degree after the subsystem is started and triggers high-pressure protection. The control module 300 is used to increase the startup opening degree by a preset increment and restart the subsystem after it is determined that the startup opening degree is less than the preset opening degree. The control module 300 is also used to repeat the above steps until the subsystem runs normally after startup or until the startup opening degree reaches the preset opening degree if the subsystem triggers high-pressure protection after the startup opening degree is increased by the preset increment.

[0090] In some embodiments, the present application also provides a heat pump unit, which can include a processor 601 with one or more processing cores, a memory with one or more computer readable storage media, a power supply 603 and an input unit 604, etc. Those skilled in the art can understand that the structure of the above-mentioned heat pump unit does not constitute a limitation on the heat pump unit, and can include more or fewer components, or combine certain components, or different component arrangements. Among them:

[0091] The processor 601 is the controller of the heat pump unit, which connects various parts of the heat pump unit through various interfaces and lines, executes software programs and / or modules stored in the memory and calls data stored in the memory, performs various functions of the heat pump unit and processes data, thereby overall monitoring the heat pump unit. Optionally, the processor 601 can include one or more processing cores; preferably, the processor 601 can integrate an application processor 601 and a modem processor 601, wherein the application processor 601 mainly processes the operating system, user interface and computer programs, etc., and the modem processor 601 mainly processes wireless communication. It can be understood that the above-mentioned modem processor 601 can also not be integrated into the processor 601.

[0092] The memory can be used to store software programs and modules, and the processor 601 executes various function applications and data processing by running the software programs and modules stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, computer programs required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; and the data storage area can store data created according to the use of the server, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device. Accordingly, the memory can also include a memory controller to provide access of the processor 601 to the memory.

[0093] The heat pump unit also includes a power supply 603 for powering various components. Preferably, the power supply 603 can be logically connected to the processor 601 through a power supply 603 management system, so as to realize functions such as charge management, discharge management, and power consumption management through the power supply 603 management system. The power supply 603 can also include one or more than one direct current or alternating current power supply 603, a recharging system, a power supply 603 fault detection circuit, a power supply 603 converter or inverter, a power supply 603 state indicator, and the like.

[0094] The heat pump unit can also include an input unit 604, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0095] Although not shown, the heat pump unit can also include a display unit, and the like, which will not be described here. In the present embodiment, the processor 601 in the heat pump unit will load executable files corresponding to the processes of one or more than one computer program into the memory according to the following instructions, and run the computer programs stored in the memory by the processor 601 to execute the following steps:

[0096] After the high-pressure protection is triggered by the start-up of the subsystem, it is determined whether the start-up opening degree of the expansion valve 540 of the subsystem is less than a preset opening degree;

[0097] After it is determined that the start-up opening degree is less than the preset opening degree, the start-up opening degree is increased by a preset increment, and the subsystem is restarted;

[0098] If the start-up of the subsystem continues to trigger the high-pressure protection after the start-up opening degree is increased by the preset increment, the above steps are repeatedly executed until the subsystem runs normally after start-up or until the start-up opening degree reaches the preset opening degree.

[0099] For example, the heat pump unit can include a heat pump system, a power supply system, a control system, a communication system, and the like. Figure 4As shown, the heat pump unit further comprises a water-side heat exchanger 400, and at least two subsystems, each of which comprises a compressor 510, a four-way valve 520, a gas-liquid separator 530, and an air-side heat exchanger 550, and each of which is connected with the water-side heat exchanger 400.

[0100] Those skilled in the art can understand that all or part of the steps in any of the methods of the above embodiments can be completed by a computer program, or by a computer program controlling related hardware, which can be stored in a computer readable storage medium and loaded and executed by the processor 601.

[0101] In some embodiments, the present application also provides a storage medium storing a computer program, which is loaded and executed by the processor 601 to perform the following steps:

[0102] After the high-pressure protection is triggered by the startup of the subsystem, it is determined whether the startup opening degree of the expansion valve 540 of the subsystem is less than a preset opening degree;

[0103] After it is determined that the startup opening degree is less than the preset opening degree, the startup opening degree is increased by a preset increment, and the subsystem is restarted;

[0104] If the high-pressure protection is still triggered after the startup of the subsystem after the startup opening degree is increased by the preset increment, the above steps are repeatedly executed until the subsystem runs normally after startup or until the startup opening degree reaches the preset opening degree.

[0105] Through the above steps, by detecting the startup opening degree of the expansion valve 540 of the subsystem, the startup opening degree of the expansion valve 540 is gradually increased in the case that the startup opening degree of the expansion valve 540 does not reach the preset opening degree, and the startup opening degree of the expansion valve 540 is adjusted within a preset range to avoid the high-pressure protection triggered by the startup of the subsystem as much as possible, thereby improving the user experience.

[0106] As will be appreciated by one of ordinary skill in the art, any reference to storage, storage media, a database or other medium can include a non-transitory and / or transitory storage. Non-limiting, transitory storage can include random access memory (RAM), and non-limiting, non-transitory storage can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM), and / or flash memory. The various forms of storage can be combined into one or more common types of storage, for example, a hard drive can include both transitory RAM and non-transitory ROM. As will also be appreciated, a storage medium can be associated with any single component of a machine or composed of multiple components of a machine. As will be further appreciated, storage media can be embedded in a machine or can be external to the machine. As will be appreciated, a storage medium can be any available medium that can be accessed by a machine. As will be appreciated, a storage medium can be any non-transitory storage medium. As will be appreciated, a storage medium can be any transitory storage medium.

[0107] The steps in the heat pump unit control method according to any one of the embodiments provided by the present application can be executed by the computer program stored in the storage medium, and thus the beneficial effects of the heat pump unit control method according to any one of the embodiments provided by the present application can be achieved. Details are described above, and thus will not be repeated here.

[0108] The specific implementation of the above operations can refer to the above embodiments, and thus will not be repeated here.

[0109] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can refer to the detailed description of other embodiments above, and thus will not be repeated here.

[0110] The above is only optional embodiments of the present application, and thus does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, which is made based on the content of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

1. A control method for a heat pump unit, characterized in that, A method for controlling a heat pump unit, the heat pump unit comprising a water-side heat exchanger and at least two subsystems, each subsystem comprising a compressor, a four-way valve, an expansion valve, a gas-liquid separator, and an air-side heat exchanger, each subsystem being connected to the water-side heat exchanger, the heat pump unit control method comprising: After the subsystem is powered on and high-pressure protection is triggered, determine whether the opening degree of the expansion valve of the subsystem is less than the preset opening degree. After determining that the power-on degree is less than the preset degree, the power-on degree is increased by a preset increment, and the subsystem is restarted; If the subsystem continues to trigger high-voltage protection after the startup degree is increased by the preset increment, then the above steps are repeated until the subsystem operates normally after startup or until the startup degree reaches the preset degree. If the high-pressure protection is still triggered when the subsystem is started after the expansion valve of the subsystem reaches the preset opening, it is determined whether the fans of all the air-side heat exchangers of the heat pump unit are at the lowest fan speed when they are started. After confirming that all the fans of the air-side heat exchangers of the heat pump unit are at the lowest fan speed when started, the fans of the air-side heat exchangers of the heat pump unit are turned off one by one. After each fan of the air-side heat exchanger is turned off, the subsystem that triggers high-pressure protection is restarted until the subsystem that triggers high-pressure protection can operate normally after restarting or until only one fan of the air-side heat exchanger of the heat pump unit remains in the on state.

2. The heat pump unit control method according to claim 1, characterized in that, The heat pump unit control method also includes: If, after shutting down the fan of the air-side heat exchanger of a portion of the subsystem, the subsystem that triggered the high-pressure protection can operate normally after being restarted, then after the subsystem that triggered the high-pressure protection has been operating normally for a preset time, the fan of the shut-down air-side heat exchanger will be turned on.

3. The heat pump unit control method according to claim 1, characterized in that, The process of sequentially shutting down the fans of the air-side heat exchangers of the heat pump unit, and restarting the subsystem that triggered high-pressure protection after shutting down each fan of the air-side heat exchanger, continues until the subsystem that triggered high-pressure protection can operate normally after restarting or until only one fan of the air-side heat exchanger of the heat pump unit remains on, includes: After determining that the number of subsystems in the heat pump unit that have triggered high-pressure protection is less than the total number of subsystems in the heat pump unit, the fans of the air-side heat exchangers of the subsystems that have triggered high-pressure protection are shut down one by one. After shutting down the fan of each air-side heat exchanger, the subsystem that has triggered high-pressure protection is restarted, until all the subsystems that have triggered high-pressure protection can operate normally after restarting or until the fans of the air-side heat exchangers of all the subsystems in the heat pump unit that have triggered high-pressure protection are shut down. After all the fans of the air-side heat exchangers of the subsystems that have triggered high-pressure protection in the heat pump unit are shut down, if there are still subsystems in the heat pump unit that have triggered high-pressure protection upon startup, then it is determined whether the number of subsystems in the heat pump unit that have not triggered high-pressure protection upon startup is greater than 2. After determining that the number of subsystems in the heat pump unit that have not triggered high-pressure protection upon startup is greater than 2, the fans of the air-side heat exchangers of the subsystems in the heat pump unit that have not triggered high-pressure protection upon startup are shut down one by one. After shutting down the fan of each air-side heat exchanger, the subsystem that triggered high-pressure protection is restarted, until all the subsystems that triggered high-pressure protection can operate normally after restarting or until only one fan of the air-side heat exchanger of the heat pump unit remains in the on state.

4. The heat pump unit control method according to claim 1, characterized in that, The heat pump unit control method also includes: After determining that not all the fans of the air-side heat exchangers of the heat pump unit are at their lowest fan speed when started, the fans of the air-side heat exchangers that are not at their lowest fan speed in the heat pump unit are adjusted to their lowest fan speed one by one. After adjusting the fan speed of each air-side heat exchanger, the subsystem that triggers high-pressure protection is restarted until the subsystem that triggers high-pressure protection can operate normally after restarting or until all the fans of the air-side heat exchangers of the heat pump unit are at their lowest fan speed when started.

5. The heat pump unit control method according to claim 4, characterized in that, The step of adjusting the fans of each air-side heat exchanger in the heat pump unit that is not at the lowest fan speed to the lowest fan speed, and restarting the subsystem that triggered the high-pressure protection after each fan speed adjustment, until the subsystem that triggered the high-pressure protection can operate normally after restarting, or until all the fans of the air-side heat exchangers in the heat pump unit are at the lowest fan speed when started, includes: After confirming that the fans of the air-side heat exchangers of all the subsystems that have triggered high-pressure protection are not all at the lowest fan speed, adjust the fans of the air-side heat exchangers of the subsystems that have triggered high-pressure protection to the lowest fan speed one by one, and restart the subsystem that has triggered high-pressure protection after each adjustment of the fan of the air-side heat exchanger, until the subsystems that have triggered high-pressure protection can operate normally after restarting or until the fans of the air-side heat exchangers of all the subsystems that have triggered high-pressure protection are at the lowest fan speed; After confirming that the fans of the air-side heat exchangers of all subsystems that have triggered high-pressure protection are at the lowest fan speed, adjust the fans of the air-side heat exchangers of the subsystems that have not triggered high-pressure protection to the lowest fan speed one by one. After adjusting the fan speed of each air-side heat exchanger, restart the subsystem that triggered high-pressure protection, until the subsystem that triggered high-pressure protection can operate normally after restarting, or until the fans of the air-side heat exchangers of all subsystems of the heat pump unit are at the lowest fan speed when started.

6. The heat pump unit control method according to claim 1, characterized in that, The heat pump unit control method also includes: If it is determined that only one fan of the air-side heat exchanger of the heat pump unit is in the on state, and the heat pump unit still has a subsystem that triggers high-pressure protection upon startup, then the mode of the four-way valve of the subsystem that triggers high-pressure protection is determined. If the four-way valve is in heating mode, control the four-way valve to switch from heating mode to cooling mode, and restart the subsystem; If the four-way valve is in cooling mode, then control the four-way valve to switch from cooling mode to heating mode, and restart the subsystem.

7. A heat pump unit control device, characterized in that, For controlling a heat pump unit, the heat pump unit includes a water-side heat exchanger and at least two subsystems. Each subsystem includes a compressor, a four-way valve, an expansion valve, a gas-liquid separator, and an air-side heat exchanger. Each subsystem is connected to the water-side heat exchanger. The heat pump unit control device includes: The acquisition module is used to acquire the opening degree of the expansion valve of the heat pump unit's subsystem; The judgment module is used to determine whether the opening degree of the subsystem is less than a preset opening degree after the subsystem is powered on and the high voltage protection is triggered. The control module is configured to, upon determining that the power-on opening degree is less than the preset opening degree, increase the power-on opening degree by a preset increment and restart the subsystem; the control module is also configured to, if the subsystem triggers high-voltage protection upon power-on after increasing the power-on opening degree by the preset increment, repeat the above steps until the subsystem operates normally after power-on or until the power-on opening degree reaches the preset opening degree; If the high-pressure protection is still triggered when the subsystem is started after the expansion valve of the subsystem reaches the preset opening, it is determined whether the fans of all the air-side heat exchangers of the heat pump unit are at the lowest fan speed when they are started. After confirming that all the fans of the air-side heat exchangers of the heat pump unit are at the lowest fan speed when started, the fans of the air-side heat exchangers of the heat pump unit are turned off one by one. After each fan of the air-side heat exchanger is turned off, the subsystem that triggers high-pressure protection is restarted until the subsystem that triggers high-pressure protection can operate normally after restarting or until only one fan of the air-side heat exchanger of the heat pump unit remains in the on state.

8. A heat pump unit, characterized in that, The device includes a water-side heat exchanger, at least two subsystems, a memory, and a processor. Each subsystem includes a compressor, a four-way valve, an expansion valve, a gas-liquid separator, and an air-side heat exchanger. Each subsystem is connected to the water-side heat exchanger. The memory stores a computer program, and the processor runs the computer program in the memory to perform the steps in the heat pump unit control method according to any one of claims 1-6.

9. A storage medium, characterized in that, The storage medium stores a computer program, which is executed and loaded by a processor to perform the steps in the heat pump unit control method according to any one of claims 1-6.

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