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

Abstract

The invention 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, and each subsystem is connected with the water side heat exchanger; the heat pump unit control method comprises the steps that after a subsystem is started to trigger high-pressure protection, whether the starting opening degree of an expansion valve of the subsystem is smaller than a preset opening degree or not is determined; after it is determined that the starting-up opening degree is smaller than the preset opening degree, the starting-up opening degree is increased according to a preset increment, and the subsystem is restarted; if the subsystem still continues to trigger high-voltage protection after the starting-up opening degree is increased according to the preset increment, the steps are repeatedly executed till the subsystem normally runs after being started up or till the starting-up opening degree reaches the preset opening degree; the start-up opening degree of the expansion valve is adjusted within the preset range to prevent the subsystem from triggering high-voltage protection during start-up as much as possible, and the use experience of a user is improved.

Description

Technical Field

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

[0002] The heat pump air conditioning system mainly uses the solar energy resources stored in the surface soil, air and water as the heat source for heat exchange to achieve the purpose of heating and cooling. It has no combustion, no smoke exhaust, no waste, and no pollution. It is a clean and environmentally friendly technology that utilizes renewable resources.

[0003] The water source heat pump units in existing fixed-frequency heat pump air-conditioning units are usually prone to startup high-voltage protection in some subsystems when the ambient temperature and water source temperature are high, causing the unit to be unable to be used normally, affecting the user experience. Summary of the invention

[0004] The main purpose of the embodiments of the present invention is to provide a heat pump unit control method, device, heat pump unit and storage medium, aiming to improve the technical problem in the prior art that some subsystems of fixed-frequency heat pump air-conditioning units are prone to high-voltage protection, resulting in the subsystem being unable to be used normally.

[0005] An embodiment of the present invention provides a heat pump unit control method, 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, and the heat pump unit control method includes:

[0006] After the subsystem is turned on and the high pressure protection is triggered, determining whether the opening degree of the expansion valve of the subsystem is less than a preset opening degree;

[0007] After determining that the power-on opening is less than the preset opening, increasing the power-on opening by a preset increment, and restarting the subsystem;

[0008] If the subsystem continues to trigger high-voltage protection after the startup opening is increased by the preset increment, the above steps are repeated until the subsystem runs normally after startup or until the startup opening reaches the preset opening.

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

[0010] After the opening of the expansion valve of the subsystem reaches the preset opening, if the high-pressure protection continues to be triggered when the subsystem is turned on, determining whether the fans of all the wind-side heat exchangers of the heat pump unit are at the lowest wind speed when they are turned on;

[0011] After determining that all the fans of the wind-side heat exchangers of the heat pump unit are at the lowest wind speed when turned on, shut down the fans of the wind-side heat exchangers of the heat pump unit one by one, and restart the subsystem that triggers the high-pressure protection after shutting down each fan of the wind-side heat exchanger, until the subsystem that triggers the high-pressure protection can operate normally after restarting or until only one fan of the wind-side heat exchanger in the heat pump unit remains in the turned-on state.

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

[0013] If after shutting down the fans of the wind-side heat exchangers of some of the subsystems, the subsystems that trigger the high-pressure protection can operate normally after being turned on, then after the subsystems that trigger the high-pressure protection operate normally for a preset time, the fans of the shut-down wind-side heat exchangers are turned on.

[0014] In some embodiments of the present invention, the fans of the wind-side heat exchangers of the heat pump unit are turned off one by one, and after each fan of the wind-side heat exchanger is turned off, the subsystem that triggers the high-voltage protection is restarted until the subsystem that triggers the high-voltage protection can operate normally after restarting or until only one fan of the wind-side heat exchanger of the heat pump unit is left in the turned-on state, including:

[0015] After determining that the number of the subsystems that trigger high-pressure protection in the heat pump unit is less than the total number of the subsystems of the heat pump unit, shut down the fans of the wind-side heat exchangers of the subsystems that trigger high-pressure protection one by one, and restart the subsystems that trigger high-pressure protection after shutting down each fan of the wind-side heat exchanger, until the subsystems that trigger high-pressure protection can operate normally after restarting or until the fans of the wind-side heat exchangers of all the subsystems that trigger high-pressure protection of the heat pump unit are shut down;

[0016] After the fans of the wind-side heat exchangers of all the subsystems of the heat pump unit that trigger high-pressure protection are turned off, if there are still subsystems in the heat pump unit that trigger high-pressure protection when turned on, determine whether the number of subsystems in the heat pump unit that do not trigger high-pressure protection when turned on is greater than 2;

[0017] After determining that the number of the subsystems in the heat pump unit that are turned on without triggering the over-high pressure protection is greater than 2, the fans of the wind-side heat exchangers of the subsystems in the heat pump unit that are turned on without triggering the over-high pressure protection are shut down one by one, and after shutting down each fan of the wind-side heat exchanger, the subsystem that triggers the high-pressure protection is restarted until the subsystems that trigger the high-pressure protection can operate normally after restarting or until only one fan of the wind-side heat exchanger is left in the turned-on state in the heat pump unit.

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

[0019] After determining that the fans of all the wind-side heat exchangers of the heat pump unit are not all at the lowest wind speed when they are turned on, adjust the fans of the wind-side heat exchangers in the heat pump unit that are not at the lowest wind speed to the lowest wind speed one by one, and restart the subsystem that triggers the high-pressure protection after each adjustment of the fan gear of the wind-side heat exchanger, until the subsystem that triggers the high-pressure protection can operate normally after restarting or until the fans of all the wind-side heat exchangers of the heat pump unit are at the lowest wind speed when they are turned on.

[0020] In some embodiments of the present invention, the fans of the wind-side heat exchangers in the heat pump unit that are not at the lowest wind speed are adjusted to the lowest wind speed one by one, and after each adjustment of the fan gear of the wind-side heat exchanger, the subsystem that triggers the high-pressure protection is restarted until the subsystem that triggers the high-pressure protection can operate normally after restarting or until the fans of all the wind-side heat exchangers in the heat pump unit are at the lowest wind speed when they are turned on, including:

[0021] After determining that the fans of the wind-side heat exchangers of all the subsystems that trigger the high-pressure protection are not all at the lowest wind speed, adjust the fans of the wind-side heat exchangers of the subsystems that trigger the high-pressure protection to the lowest wind speed one by one, and restart the subsystems that trigger the high-pressure protection after each adjustment of the fans of the wind-side heat exchangers, until the subsystems that trigger the high-pressure protection can operate normally after restarting or until the fans of the wind-side heat exchangers of all the subsystems that trigger the high-pressure protection are at the lowest wind speed;

[0022] After determining that the fans of the wind-side heat exchangers of all the subsystems that triggered the high-pressure protection are at the lowest wind speed, the fans of the wind-side heat exchangers of the subsystems that did not trigger the high-pressure protection are adjusted to the lowest wind speed one by one, and after each adjustment of the fan gear of the wind-side heat exchanger, the subsystem that triggered the high-pressure protection is restarted until the subsystem that triggered the high-pressure protection can operate normally after restarting or until the fans of the wind-side heat exchangers of all the subsystems of the heat pump unit are at the lowest wind speed when started.

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

[0024] When it is determined that only one fan of the wind-side heat exchanger is left in the heat pump unit and is in an on state, and the heat pump unit still has the subsystem that triggers high-pressure protection when it is turned on, 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, controlling the four-way valve to switch from the heating mode to the cooling mode, and restarting the subsystem;

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

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

[0028] An acquisition module, the acquisition module is used to acquire the opening degree of the expansion valve of the subsystem of the heat pump unit;

[0029] A judgment module, the judgment module is used to determine whether the power-on opening of the subsystem is less than a preset opening after the high-voltage protection is triggered when the subsystem is powered on;

[0030] A control module, wherein the control module is used to increase the power-on opening by a preset increment and restart the subsystem after determining that the power-on opening is less than the preset opening; the control module is also used to repeat the above steps until the subsystem operates normally after startup or until the power-on opening reaches the preset opening if the subsystem starts to trigger high-voltage protection after the power-on opening is increased by the preset increment.

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

[0032] In some embodiments of the present invention, a storage medium is further provided, wherein the storage medium stores a computer program, and the computer program is loaded and executed by a processor to execute the steps in the above-mentioned heat pump unit control method.

[0033] Embodiments of the present invention provide a heat pump unit control method, device, heat pump unit and storage medium. When a subsystem is turned on and high-pressure protection is triggered, the heat pump unit control method detects the startup opening of the expansion valve of the subsystem. If the startup opening of the expansion valve does not reach a preset opening, the startup opening of the expansion valve is gradually increased. By adjusting the startup opening of the expansion valve within a preset range, the subsystem is prevented from triggering high-pressure protection when it is turned on as much as possible, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 A schematic flow chart of a heat pump unit control method according to an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the structure of a heat pump unit control device according to an embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of a heat pump unit according to an embodiment of the present invention;

[0038] Figure 4 It is a schematic diagram of the structure of a subsystem and a water-side heat exchanger according to an embodiment of the present invention.

[0039] Figure numerals: 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, wind side heat exchanger; 551, fan; 601, processor; 602, storage; 603, power supply; 604, input unit. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] like Figure 1-Figure 4 As shown, the present invention 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 a wind-side heat exchanger 550, each subsystem being connected to the water-side heat exchanger 400, the heat pump unit control method comprising:

[0045] S100, after the subsystem is turned on and the high pressure protection is triggered, it is determined whether the opening degree of the expansion valve 540 of the subsystem is less than a preset opening degree.

[0046] Among them, when the subsystem is turned on and the high-voltage protection is triggered, the subsystem will be forced to shut down, resulting in the inability to work normally for cooling / heating heat exchange; the startup opening of the expansion valve 540 is the opening size of the expansion valve 540 when the subsystem is turned on; the preset opening size is the opening size pre-stored in the heat pump unit controller, which is generally 480 steps.

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

[0048] Among them, the preset increment is the opening increment pre-stored in the controller. For example, if the preset increment is 20 steps, after the subsystem triggers the high-pressure protection for the first time, if the startup opening of the expansion valve 540 is 110 at this time, it will increase to 130 according to the preset increment and then restart the subsystem.

[0049] S120, if the subsystem still continues to trigger high-voltage protection after the startup opening is increased by a preset increment, the above steps are repeated until the subsystem runs normally after startup or until the startup opening reaches a preset opening.

[0050] Among them, after the startup opening of the expansion valve 540 is adjusted from 110 to 130 according to the preset increment, if the subsystem operates normally after startup, there is no need to execute the above steps again; if the high-pressure protection is still triggered after the subsystem is started, continue to execute the above steps to adjust the startup opening of the expansion valve 540 from 130 to 150. If the subsystem operates normally after startup, there is no need to execute the above steps again. If the high-pressure protection is still triggered after the subsystem is started, repeat the above steps; when the startup opening is increased to 480 (preset opening), if the subsystem still triggers high-pressure protection when it is started, there is no need to continue to execute the above steps to increase the opening of the expansion valve 540.

[0051] It can be understood that when the high-pressure protection is triggered when the subsystem is turned on, the control method of the heat pump unit detects the startup opening of the expansion valve 540 of the subsystem. If the startup opening of the expansion valve 540 does not reach the preset opening, the startup opening of the expansion valve 540 is gradually increased. By adjusting the startup opening of the expansion valve 540 within the preset range, the subsystem is prevented from triggering the high-pressure protection when it is turned on as much as possible, thereby improving the user experience.

[0052] In some embodiments, after the subsystem is turned on and the high pressure protection is triggered, the preset opening degree of the expansion valve 540 is determined according to the ambient temperature.

[0053] Specifically, the preset opening degree at a certain ambient temperature may be determined according to a corresponding relationship table between the ambient temperature and the preset opening degree in the controller.

[0054] Among them, the corresponding relationship table between ambient temperature and preset opening degree can be obtained by simulation software, or by collecting working data of the heat pump unit by the controller through cloud computing simulation.

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

[0056] S200, after the opening of the expansion valve 540 of the subsystem reaches the preset opening, if the high pressure protection continues to be triggered when the subsystem is turned on, determine whether the fans 551 of all wind-side heat exchangers 550 of the heat pump unit are at the lowest wind speed when they are turned on.

[0057] Each subsystem generally has a wind-side heat exchanger 550 , and a wind-side heat exchanger 550 generally has a fan 551 and a fin heat exchanger.

[0058] S300, after determining that the fans 551 of all the wind-side heat exchangers 550 of the heat pump unit are at the lowest wind speed when turned on, shut down the fans 551 of the wind-side heat exchangers 550 of the heat pump unit one by one, and restart the subsystem that triggers the high-pressure protection after shutting down each fan 551 of the wind-side heat exchanger 550, until the subsystem that triggers the high-pressure protection can operate normally after restarting or until only one fan 551 of the wind-side heat exchanger 550 of the heat pump unit remains in the turned-on state.

[0059] Among them, turning off the fan 551 of the wind-side heat exchanger 550 means that the fan 551 of the wind-side heat exchanger 550 is not started when the machine is turned on.

[0060] Among them, shutting down the fan 551 of each wind-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 up.

[0061] Among them, when the heat pump unit is turned off and only the fan 551 of one wind-side heat exchanger 550 is in the on state when it is turned on, if there are still subsystems in the heat pump unit that will trigger high-voltage protection when it is turned on, there is no need to turn off the fan 551 of the wind-side heat exchanger 550.

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

[0063] S500, if after shutting down the fan 551 of the wind-side heat exchanger 550 of some subsystems, the subsystems triggering the high-pressure protection can all operate normally after being turned on, then after the subsystems triggering the high-pressure protection operate normally for a preset time, turn on the fan 551 of the shut-down wind-side heat exchanger 550.

[0064] Specifically, after the fans 551 of some wind-side heat exchangers 550 are turned off, all subsystems of the heat pump unit can operate normally after being turned on. Then, after the subsystem that triggers the over-high pressure protection starts and operates normally for a preset time, the fans 551 of the turned-off wind-side heat exchangers 550 are turned on to enable the subsystem to operate normally.

[0065] The preset time is a time length pre-stored in the controller, which is generally obtained through simulation experiments and stored in the controller.

[0066] In some embodiments, S300, the fans 551 of the wind-side heat exchangers 550 of the heat pump unit are turned off one by one, and after each fan 551 of the wind-side heat exchanger 550 is turned off, the subsystem that triggers the high-voltage protection is restarted until the subsystem that triggers the high-voltage protection can operate normally after restarting or until only one fan 551 of the wind-side heat exchanger 550 of the heat pump unit remains in the turned-on state, including:

[0067] S310, after determining that the number of subsystems that trigger high-pressure protection in the heat pump unit is less than the total number of subsystems in the heat pump unit, shut down the fans 551 of the wind-side heat exchangers 550 of the subsystems that trigger high-pressure protection one by one, and restart the subsystems that trigger high-pressure protection after shutting down each fan 551 of the wind-side heat exchanger 550, until the subsystems that trigger high-pressure protection can operate normally after restarting or until the fans 551 of the wind-side heat exchangers 550 of all subsystems that trigger high-pressure protection in the heat pump unit are shut down.

[0068] Among them, it is determined that the number of subsystems in the heat pump unit that trigger high-pressure protection is less than the total number of subsystems in the heat pump unit, and it is determined that the number of subsystems that are still turned on to trigger high-pressure protection when the expansion valve 540 has been adjusted to the preset opening is less than the total number of subsystems in the heat pump unit, that is, some subsystems are operating normally at this time, and some are turned on to trigger high-pressure protection.

[0069] When the number of subsystems triggering high-voltage protection in the heat pump unit is less than the total number of subsystems in the heat pump unit, the fan 551 of the subsystem triggering high-voltage protection is shut down first to avoid affecting the subsystems that are already operating normally.

[0070] S320, after the fans 551 of the wind-side heat exchangers 550 of all the subsystems of the heat pump unit that trigger the high-pressure protection are turned off, if there are still subsystems in the heat pump unit that trigger the high-pressure protection when turned on, determine whether the number of subsystems in the heat pump unit that do not trigger the high-pressure protection when turned on is greater than 2.

[0071] Among them, determining whether the number of subsystems in the heat pump unit that are started up without triggering over-high voltage protection is greater than 2 is mainly intended to determine whether the fan 551 of the wind-side heat exchanger 550 of the heat pump unit can continue to be shut down.

[0072] S330, after determining that the number of subsystems in the heat pump unit that are turned on without triggering the over-high pressure protection is greater than 2, shut down the fans 551 of the wind-side heat exchangers 550 of the subsystems in the heat pump unit that are turned on without triggering the over-high pressure protection one by one, and restart the subsystems that trigger the high-pressure protection after shutting down each fan 551 of the wind-side heat exchanger 550, until the subsystems that trigger the high-pressure protection can operate normally after restarting or until only one fan 551 of the wind-side heat exchanger 550 is left in the heat pump unit in the turned-on state.

[0073] That is, by first shutting down the fan 551 of the subsystem that triggers the high-voltage protection and then shutting down the fan 551 of the subsystem that does not trigger the high-voltage protection, the normal operation of the subsystem that does not trigger the high-voltage protection is avoided as much as possible.

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

[0075] S400, after determining that the fans 551 of all the wind-side heat exchangers 550 of the heat pump unit are not all at the lowest wind speed when they are turned on, adjust the fans 551 of the wind-side heat exchangers 550 in the heat pump unit that are not at the lowest wind speed to the lowest wind speed one by one, and restart the subsystem that triggers the high-pressure protection after each adjustment of the fan 551 of the wind-side heat exchanger 550, until the subsystem that triggers the high-pressure protection can operate normally after restarting or until the fans 551 of all the wind-side heat exchangers 550 of the heat pump unit are at the lowest wind speed when they are turned on.

[0076] That is, when it is determined that all fans 551 in the heat pump unit are not at the lowest wind speed, the fans 551 are first lowered to the lowest wind speed one by one to reduce the evaporation pressure of the heat pump unit, so that the subsystem that triggers the high-pressure protection can start and operate normally.

[0077] In some embodiments, S400, the fans 551 of the wind-side heat exchangers 550 in the heat pump unit that are not at the lowest wind speed are adjusted to the lowest wind speed one by one, and after each adjustment of the fan 551 of the wind-side heat exchanger 550, the subsystem that triggers the high-pressure protection is restarted until the subsystem that triggers the high-pressure protection can operate normally after restarting or until the fans 551 of all the wind-side heat exchangers 550 of the heat pump unit are at the lowest wind speed when they are turned on, including:

[0078] S410, after determining that the fans 551 of the wind-side heat exchangers 550 of all the subsystems that trigger the high-pressure protection are not all at the lowest wind speed, the fans 551 of the wind-side heat exchangers 550 of the subsystems that trigger the high-pressure protection are adjusted to the lowest wind speed one by one, and after each adjustment of the fan 551 of the wind-side heat exchanger 550, the subsystem that triggers the high-pressure protection is restarted until the subsystems that trigger the high-pressure protection can operate normally after restarting or until the fans 551 of the wind-side heat exchangers 550 of all the subsystems that trigger the high-pressure protection are at the lowest wind speed.

[0079] Among them, the subsystem that triggers high-pressure protection in "determining that the fans 551 of the wind-side heat exchangers 550 of all subsystems that trigger high-pressure protection are not all at the lowest wind speed" refers to the subsystem that triggers high-pressure protection when the expansion valve 540 is at the maximum opening and is still turned on.

[0080] S420, after determining that the fans 551 of the wind-side heat exchangers 550 of all the subsystems that triggered the high-pressure protection are at the lowest wind speed, adjust the fans 551 of the wind-side heat exchangers 550 of the subsystems that did not trigger the high-pressure protection to the lowest wind speed one by one, and restart the subsystem that triggered the high-pressure protection after each adjustment of the fan 551 of the wind-side heat exchanger 550, until the subsystem that triggered the high-pressure protection can operate normally after restarting or until the fans 551 of the wind-side heat exchangers 550 of all the subsystems of the heat pump unit are at the lowest wind speed when they are turned on

[0081] It can be understood that, when the fans 551 of the wind-side heat exchangers 550 of the subsystem that triggers the high-pressure protection have not all been lowered to the lowest wind speed, the fans 551 of the wind-side heat exchangers 550 of the subsystem that triggers the high-pressure protection will be lowered to the lowest wind speed first to avoid affecting the normal operation of the subsystem that has not triggered the high-pressure protection. If the fans 551 of the wind-side heat exchangers 550 of the subsystem that triggers the high-pressure protection have all been lowered to the lowest wind speed, the fans 551 of the wind-side heat exchangers 550 of the subsystem that has not triggered the high-pressure protection will be lowered to the lowest wind speed one by one to minimize the impact on the subsystem that is already operating normally.

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

[0083] S600, when it is determined that only one fan 551 of the wind-side heat exchanger 550 is left in the heat pump unit and is in the on state, and the heat pump unit still has a subsystem that triggers high-pressure protection when it is turned on, determine the mode of the four-way valve 520 of the subsystem that triggers high-pressure protection.

[0084] Among them, the four-way valve 520 generally has two connection modes, namely, cooling mode and heating mode. In the heating mode, the four-way valve 520 connects the air outlet of the compressor 510 with the water-side heat exchanger 400, and the return air port of the compressor 510 with the air-side heat exchanger 550; in the heating mode, the four-way valve 520 connects the air outlet of the compressor 510 with the air-side heat exchanger 550, and the return air port of the compressor 510 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 controlled to switch from the heating mode to the cooling mode, and the subsystem is restarted.

[0086] S620: If the four-way valve 520 is in the cooling mode, the four-way valve 520 is controlled to switch from the cooling mode to the heating mode, and the subsystem is restarted.

[0087] That is, when adjusting the expansion valve 540 and shutting down the fan 551 cannot enable the subsystem for triggering the high-pressure protection to operate normally, the heating mode and the cooling mode are switched by the four-way valve 520 to start the subsystem for triggering the high-pressure protection, so as to avoid some subsystems of the heat pump unit being unusable.

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

[0089] In some embodiments, the present invention further 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 obtain the power-on opening of the expansion valve 540 of the subsystem of the heat pump unit. The judgment module 200 is used to determine whether the power-on opening of the subsystem is less than a preset opening after the subsystem is powered on and triggers high-pressure protection. The control module 300 is used to increase the power-on opening by a preset increment and restart the subsystem after determining that the power-on opening is less than the preset opening. The control module 300 is also used to repeat the above steps until the subsystem is powered on and operates normally or until the power-on opening reaches a preset opening if the power-on opening is increased by a preset increment and the high-pressure protection is triggered.

[0090] In some embodiments, the present invention further provides a heat pump unit, which may include one or more processing core processors 601, one or more computer-readable storage media memories, a power supply 603, an input unit 604 and other components. Those skilled in the art will appreciate that the structure of the heat pump unit described above does not constitute a limitation on the heat pump unit, and may include more or fewer components, or a combination of certain components, or different component arrangements. Among them:

[0091] The processor 601 is the controller of the heat pump unit, and uses various interfaces and lines to connect various parts of the entire heat pump unit. By running or executing software programs and / or modules stored in the memory, and calling data stored in the memory, the processor 601 performs various functions of the heat pump unit and processes data, thereby monitoring the heat pump unit as a whole. Optionally, the processor 601 may include one or more processing cores; preferably, the processor 601 may 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, and the modem processor 601 mainly processes wireless communications. It is understandable that the above-mentioned modem processor 601 may not be integrated into the processor 601.

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

[0093] The heat pump unit also includes a power supply 603 for supplying power to each component. Preferably, the power supply 603 can be logically connected to the processor 601 through a power supply 603 management system, so as to manage charging, discharging, and power consumption through the power supply 603 management system. The power supply 603 may also include one or more DC or AC power supplies 603, a recharging system, a power supply 603 fault detection circuit, a power supply 603 converter or inverter, a power supply 603 status indicator, and other arbitrary components.

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

[0095] Although not shown, the heat pump unit may further include a display unit, etc., which will not be described in detail herein. Specifically, in this embodiment, the processor 601 in the heat pump unit will load the executable files corresponding to the processes of one or more computer programs into the memory according to the following instructions, and the processor 601 will run the computer programs stored in the memory to perform the following steps:

[0096] After the subsystem is turned on and the high pressure protection is triggered, it is determined whether the opening degree of the expansion valve 540 of the subsystem is less than a preset opening degree;

[0097] After determining that the power-on opening is less than the preset opening, the power-on opening is increased by a preset increment, and the subsystem is restarted;

[0098] If the subsystem continues to trigger high-voltage protection after the startup opening is increased by the preset increment, repeat the above steps until the subsystem runs normally after startup or until the startup opening reaches the preset opening.

[0099] like Figure 4As shown, the heat pump unit also includes a water-side heat exchanger 400 and at least two subsystems, each of which includes a compressor 510, a four-way valve 520, a gas-liquid separator 530 and an air-side heat exchanger 550, and each subsystem is connected to the water-side heat exchanger 400.

[0100] A person skilled in the art can understand that all or part of the steps in any of the methods in the above embodiments can be completed by a computer program, or by controlling related hardware through a computer program. The computer program can be stored in a computer-readable storage medium and loaded and executed by processor 601601.

[0101] In some embodiments, the present invention further provides a storage medium, the storage medium stores a computer program, and the computer program is loaded by the processor 601 to perform the following steps:

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

[0103] After determining that the power-on opening is less than the preset opening, the power-on opening is increased by a preset increment, and the subsystem is restarted;

[0104] If the subsystem continues to trigger high-voltage protection after the startup opening is increased by the preset increment, repeat the above steps until the subsystem runs normally after startup or until the startup opening reaches the preset opening.

[0105] Through the above steps, by detecting the power-on opening of the expansion valve 540 of the subsystem, when the power-on opening of the expansion valve 540 has not reached the preset opening, the power-on opening of the expansion valve 540 is gradually increased. By adjusting the power-on opening of the expansion valve 540 within the preset range, the subsystem can be prevented from triggering high-pressure protection when it is turned on, thereby improving the user experience.

[0106] It will be appreciated by those skilled in the art that any reference to memory, storage, database or other medium used in the embodiments provided by the present invention may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synch l ink), DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0107] Since the computer program stored in the storage medium can execute the steps in the heat pump unit control method in any embodiment provided by the present invention, the beneficial effects that can be achieved by the heat pump unit control method in any embodiment provided by the present invention can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0108] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

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

[0110] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, within the application concept of the present invention are included in the patent protection scope of the present invention.

Claims

1. A heat pump unit control method, characterized in that: Used to control 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, and the heat pump unit control method includes: After the subsystem is turned on and the high pressure protection is triggered, determining whether the opening degree of the expansion valve of the subsystem is less than a preset opening degree; After determining that the power-on opening is less than the preset opening, increasing the power-on opening by a preset increment, and restarting the subsystem; If the subsystem continues to trigger high-voltage protection after the startup opening is increased by the preset increment, the above steps are repeated until the subsystem runs normally after startup or until the startup opening reaches the preset opening.

2. The heat pump unit control method according to claim 1, characterized in that: The heat pump unit control method further includes: After the opening of the expansion valve of the subsystem reaches the preset opening, if the high-pressure protection continues to be triggered when the subsystem is turned on, determining whether the fans of all the wind-side heat exchangers of the heat pump unit are at the lowest wind speed when they are turned on; After determining that all the fans of the wind-side heat exchangers of the heat pump unit are at the lowest wind speed when turned on, shut down the fans of the wind-side heat exchangers of the heat pump unit one by one, and restart the subsystem that triggers the high-pressure protection after shutting down each fan of the wind-side heat exchanger, until the subsystem that triggers the high-pressure protection can operate normally after restarting or until only one fan of the wind-side heat exchanger in the heat pump unit remains in the turned-on state.

3. The heat pump unit control method according to claim 2, characterized in that: The heat pump unit control method further includes: If after shutting down the fans of the wind-side heat exchangers of some of the subsystems, the subsystems that trigger the high-pressure protection can operate normally after being turned on, then after the subsystems that trigger the high-pressure protection operate normally for a preset time, the fans of the shut-down wind-side heat exchangers are turned on.

4. The heat pump unit control method according to claim 2, characterized in that: The fans of the wind-side heat exchangers of the heat pump unit are turned off one by one, and after each fan of the wind-side heat exchanger is turned off, the subsystem that triggers the high-voltage protection is restarted until the subsystem that triggers the high-voltage protection can operate normally after restarting or until only one fan of the wind-side heat exchanger of the heat pump unit is left in the turned-on state, including: After determining that the number of the subsystems that trigger high-pressure protection in the heat pump unit is less than the total number of the subsystems of the heat pump unit, shut down the fans of the wind-side heat exchangers of the subsystems that trigger high-pressure protection one by one, and restart the subsystems that trigger high-pressure protection after shutting down each fan of the wind-side heat exchanger, until the subsystems that trigger high-pressure protection can operate normally after restarting or until the fans of the wind-side heat exchangers of all the subsystems that trigger high-pressure protection of the heat pump unit are shut down; After the fans of the wind-side heat exchangers of all the subsystems of the heat pump unit that trigger high-pressure protection are turned off, if there are still subsystems in the heat pump unit that trigger high-pressure protection when turned on, determine whether the number of subsystems in the heat pump unit that do not trigger high-pressure protection when turned on is greater than 2; After determining that the number of the subsystems in the heat pump unit that are turned on without triggering the over-high pressure protection is greater than 2, the fans of the wind-side heat exchangers of the subsystems in the heat pump unit that are turned on without triggering the over-high pressure protection are shut down one by one, and after shutting down each fan of the wind-side heat exchanger, the subsystem that triggers the high-pressure protection is restarted until the subsystems that trigger the high-pressure protection can operate normally after restarting or until only one fan of the wind-side heat exchanger is left in the turned-on state in the heat pump unit.

5. The heat pump unit control method according to claim 2, characterized in that: The heat pump unit control method further includes: After determining that the fans of all the wind-side heat exchangers of the heat pump unit are not all at the lowest wind speed when they are turned on, adjust the fans of the wind-side heat exchangers in the heat pump unit that are not at the lowest wind speed to the lowest wind speed one by one, and restart the subsystem that triggers the high-pressure protection after each adjustment of the fan gear of the wind-side heat exchanger, until the subsystem that triggers the high-pressure protection can operate normally after restarting or until the fans of all the wind-side heat exchangers of the heat pump unit are at the lowest wind speed when they are turned on.

6. The heat pump unit control method according to claim 4, characterized in that: The fans of the wind-side heat exchangers in the heat pump unit that are not at the lowest wind speed are adjusted to the lowest wind speed one by one, and after each adjustment of the fan gear of the wind-side heat exchanger, the subsystem that triggers the high-pressure protection is restarted until the subsystem that triggers the high-pressure protection can operate normally after restarting or until the fans of all the wind-side heat exchangers in the heat pump unit are at the lowest wind speed when they are turned on, including: After determining that the fans of the wind-side heat exchangers of all the subsystems that trigger the high-pressure protection are not all at the lowest wind speed, adjust the fans of the wind-side heat exchangers of the subsystems that trigger the high-pressure protection to the lowest wind speed one by one, and restart the subsystems that trigger the high-pressure protection after each adjustment of the fans of the wind-side heat exchangers, until the subsystems that trigger the high-pressure protection can operate normally after restarting or until the fans of the wind-side heat exchangers of all the subsystems that trigger the high-pressure protection are at the lowest wind speed; After determining that the fans of the wind-side heat exchangers of all the subsystems that triggered the high-pressure protection are at the lowest wind speed, the fans of the wind-side heat exchangers of the subsystems that did not trigger the high-pressure protection are adjusted to the lowest wind speed one by one, and after each adjustment of the fan gear of the wind-side heat exchanger, the subsystem that triggered the high-pressure protection is restarted until the subsystem that triggered the high-pressure protection can operate normally after restarting or until the fans of the wind-side heat exchangers of all the subsystems of the heat pump unit are at the lowest wind speed when started.

7. The heat pump unit control method according to claim 2, characterized in that: The heat pump unit control method further includes: When it is determined that only one fan of the wind-side heat exchanger is left in the heat pump unit and is in an on state, and the heat pump unit still has the subsystem that triggers high-pressure protection when it is turned on, the mode of the four-way valve of the subsystem that triggers high-pressure protection is determined; If the four-way valve is in the heating mode, controlling the four-way valve to switch from the heating mode to the cooling mode, and restarting the subsystem; If the four-way valve is in the cooling mode, the four-way valve is controlled to switch from the cooling mode to the heating mode, and the subsystem is restarted.

8. A heat pump unit control device, characterized in that: include: An acquisition module, the acquisition module is used to acquire the opening degree of the expansion valve of the subsystem of the heat pump unit; A judgment module, the judgment module is used to determine whether the power-on opening of the subsystem is less than a preset opening after the high-voltage protection is triggered when the subsystem is powered on; A control module, wherein the control module is used to increase the power-on opening by a preset increment and restart the subsystem after determining that the power-on opening is less than the preset opening; the control module is also used to repeat the above steps until the subsystem operates normally after startup or until the power-on opening reaches the preset opening if the subsystem starts to trigger high-voltage protection after the power-on opening is increased by the preset increment.

9. A heat pump unit, characterized in that: It 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 of the subsystems is connected to the water-side heat exchanger, the memory stores a computer program, and the processor is used to run the computer program in the memory to execute the steps in the heat pump unit control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium stores a computer program, and the computer program is loaded and executed by a processor to execute the steps in the heat pump unit control method according to any one of claims 1 to 7.

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