WO2023005246A1 - 用于空气源热泵机组的控制方法 - Google Patents

用于空气源热泵机组的控制方法 Download PDF

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Publication number
WO2023005246A1
WO2023005246A1 PCT/CN2022/083676 CN2022083676W WO2023005246A1 WO 2023005246 A1 WO2023005246 A1 WO 2023005246A1 CN 2022083676 W CN2022083676 W CN 2022083676W WO 2023005246 A1 WO2023005246 A1 WO 2023005246A1
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WIPO (PCT)
Prior art keywords
preset
water temperature
circulation loop
pressure
outlet water
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PCT/CN2022/083676
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English (en)
French (fr)
Inventor
张宝库
韩伟涛
张丽娟
毛守博
卢大海
Original Assignee
青岛海尔空调电子有限公司
青岛海尔空调器有限总公司
海尔智家股份有限公司
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Publication of WO2023005246A1 publication Critical patent/WO2023005246A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the technical field of antifreeze for air source heat pump units, and specifically provides a control method for air source heat pump units.
  • the present invention aims to solve the above-mentioned technical problem, that is, to solve the problem that the water-side heat exchanger of the existing air source heat pump unit is easy to be frozen and cracked during operation.
  • the present invention provides a control method for an air source heat pump unit.
  • the air source heat pump unit includes a refrigerant circulation loop, a water circulation loop and an auxiliary electric heating device.
  • the refrigerant circulation loop is provided with a compressor, a four-way valve, a second A heat exchanger, an electronic expansion valve and a second heat exchanger
  • the water circulation circuit is provided with a circulating water pump
  • the refrigerant circulation circuit and the water circulation circuit can realize heat exchange through the second heat exchanger
  • the The auxiliary electric heating device can heat the water in the water circulation loop
  • the control method includes: when the air source heat pump unit starts to start, first controlling the start of the circulating water pump; obtaining the water flow rate in the water circulation loop ; If the water flow rate is greater than or equal to the preset water flow rate, then control the operation of the refrigerant circulation loop; when the air source heat pump unit is in the heating mode, obtain the outlet water temperature of the water circulation loop; according to the outlet water Temperature, to control the
  • the step of "obtaining the outlet water temperature of the water circulation loop” specifically includes: acquiring the initial outlet water temperature of the water circulation loop when the water circulation loop is started; after a preset running time, Obtain the current outlet water temperature of the water circulation circuit; the step of "controlling the operating conditions of the refrigerant circulation circuit and the opening and closing state of the auxiliary electric heating device according to the outlet water temperature” specifically includes: according to the initial outlet water temperature and the current outlet water temperature to control the operating conditions of the refrigerant circulation loop and the on-off state of the auxiliary electric heating device.
  • the step of "controlling the operating condition of the refrigerant circulation loop and the opening and closing state of the auxiliary electric heating device according to the initial outlet water temperature and the current outlet water temperature” specifically includes : if the difference between the current outlet water temperature and the initial outlet water temperature is less than or equal to the preset outlet water temperature difference and the current outlet water temperature is less than or equal to the first preset outlet water temperature, then control the operating condition of the refrigerant circulation loop No change and the auxiliary electric heating device is turned on.
  • control method further includes: re-obtaining the outlet water temperature of the water circulation loop when the auxiliary electric heating device is turned on; when the re-acquired outlet water temperature is greater than the second When the outlet water temperature is preset, the auxiliary electric heating device is turned off; wherein, the second preset outlet water temperature is greater than the first preset outlet water temperature.
  • the refrigerant circulation circuit is also provided with a high and low pressure balance valve
  • the control method further includes: when the air source heat pump unit starts to operate in the defrosting mode, controlling the The four-way valve changes direction and controls the opening of the high and low pressure balance valves.
  • the step of "controlling the opening of the high and low pressure balance valve” specifically includes: controlling the opening of the preset protection period of the high and low pressure pressure balance valve.
  • the step of "controlling the operating state of the compressor and the operating state of the electronic expansion valve according to the numerical range of the low pressure" includes: if the low pressure is less than If the first preset low pressure is greater than or equal to the second preset low pressure and lasts for a first preset time period, then the operating frequency of the compressor and the opening degree of the electronic expansion valve are controlled to remain unchanged.
  • the step of "controlling the operating state of the compressor and the operating state of the electronic expansion valve according to the numerical range of the low pressure” further includes: if the low pressure If it is less than the second preset low pressure and greater than or equal to the third preset low pressure for a second preset duration, then the operating frequency of the compressor is controlled not to increase and the opening of the electronic expansion valve is controlled to increase. big.
  • the step of "controlling the operating state of the compressor and the operating state of the electronic expansion valve according to the numerical range of the low pressure” further includes: if the low pressure If the pressure is less than the third preset low pressure and greater than or equal to the fourth preset low pressure for a third preset time period, the operating frequency of the compressor is controlled to decrease and the opening of the electronic expansion valve is controlled to increase.
  • the step of "controlling the operating state of the compressor and the operating state of the electronic expansion valve according to the numerical range of the low pressure” further includes: if the low pressure If the pressure is less than the fourth preset low pressure and lasts for a fourth preset time period, the compressor and the electronic expansion valve are controlled to be closed.
  • the present invention can compare the water flow in the water circulation circuit with the preset water flow, and if the water flow is greater than or equal to the preset water flow, control the refrigerant
  • the operation of the circulation loop can also control the operating condition of the refrigerant circulation loop and the opening and closing state of the auxiliary electric heating device by obtaining the temperature of the outlet water in the water circulation loop when the air source heat pump unit is in the heating condition
  • Controlling the operating state of the compressor and the operating state of the electronic expansion valve by obtaining the low pressure of the refrigerant circulation circuit when the air source heat pump unit is in the cooling condition, therefore, the control method can effectively ensure Under any working conditions, the second heat exchanger will not be affected by factors such as too little water flow, too low water temperature, etc., causing it to be frozen and cracked, so as to effectively ensure its reliability.
  • Fig. 1 is the structural representation of air source heat pump unit of the present invention
  • Fig. 2 is the flow chart of main steps of the control method of the present invention.
  • Fig. 3 is the flow chart of specific steps of the first preferred embodiment of the control method of the present invention.
  • Fig. 4 is the flow chart of specific steps of the second preferred embodiment of the control method of the present invention.
  • the air source heat pump unit described in the present invention may be a split air source heat pump unit or an integral air source heat pump unit, which is not restrictive, and technicians can set the present invention according to the actual use requirements.
  • the object to which the control method is applied Such changes related to application objects do not deviate from the basic principle of the present invention, and belong to the protection scope of the present invention.
  • connection should be understood in a broad sense, for example, it can be directly connected, or indirectly connected through an intermediary, or it can be Communication within two elements should therefore not be construed as a limitation of the invention. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
  • FIG. 1 is a schematic structural diagram of the air source heat pump unit of the present invention.
  • the air source heat pump unit of the present invention includes a refrigerant circulation loop, a water circulation loop and an auxiliary electric heating device (not shown in the figure), the refrigerant circulation loop is provided with a compressor 1, a four-way valve 2,
  • the first heat exchanger 3, the electronic expansion valve 4, the second heat exchanger 5 and the gas-liquid separator 6, the low-pressure pressure sensor 7 are arranged at the air inlet of the compressor 1, of course, the specific setting position is not limited;
  • the water circulation A circulating water pump 8 and a flow meter 9 are arranged on the circuit, and the circulating water pump 8 and the flow meter 9 are arranged on the water inlet side of the second heat exchanger 5, and the outlet water temperature sensor 10 is arranged on the outlet water side of the second heat exchanger 5, so as to detect The temperature of the water in the water circulation loop after passing through the second heat exchanger 5; it should be noted that although the
  • the present invention does not impose any restrictions on the specific types of the first heat exchanger 3, the second heat exchanger 5, the low pressure sensor 7 and the outlet water temperature sensor 10.
  • the first heat exchanger 3 and the second heat exchanger 5 can be a plate heat exchanger or a casing heat exchanger, and the low-pressure pressure sensor 7 can be a capacitive pressure sensor, a piezoresistive pressure sensor, a piezoelectric pressure sensor, or an outlet water temperature sensor 10 can be a thermal sensor or a thermocouple sensor, and technicians can set it by themselves according to actual conditions.
  • the air source heat pump unit of the present invention is provided with heating working conditions, cooling working conditions and defrosting working conditions. Specifically, when the air source heat pump unit is in the heating working condition, the first heat exchanger 3 is used as evaporator, and the second heat exchanger 5 is used as a condenser; when the air source heat pump unit is in cooling and defrosting conditions, the first heat exchanger 3 is used as a condenser, and the second heat exchanger 5 is used as an evaporator.
  • the present invention does not impose any restrictions on the types of specific working conditions set for the air source heat pump unit. Obviously, other working conditions can also be set, and technicians can set them according to the actual situation.
  • the air source heat pump unit of the present invention also includes a controller, which can execute the control method of the present invention, for example: the controller can control the operating conditions of the refrigerant circulation loop, control the auxiliary electric The opening and closing state of the heating device controls the operating state of the compressor 1, the electronic expansion valve 4 and the circulating water pump 8, etc.
  • the controller can be either the original controller of the air source heat pump unit or a
  • the control method of the present invention is provided with a separate controller, and technicians can set the structure and model of the controller by themselves according to actual use requirements.
  • FIG. 2 is a flow chart of the main steps of the control method of the present invention. As shown in Figure 2, based on the air source heat pump unit described in the above embodiments, the control method of the present invention includes the following steps:
  • the controller first controls the circulating water pump 8 to start, and then obtains the water flow in the water circulation loop, if the water flow is greater than or equal to the preset water flow , the controller controls the operation of the refrigerant circulation loop.
  • the preset water flow rate is 70% of the standard water flow rate
  • the standard water flow rate is the water flow rate when the unit is in stable operation.
  • the acquisition method of the water flow rate can be monitored by the water flow rate, or by the water inflow time.
  • the present invention does not make any limitation on the acquisition method of the water flow rate. The actual situation is set by itself.
  • the present invention monitors the flow rate of water through the flowmeter 9, and then obtains the water flow rate in the water circulation loop, and determines the water flow rate through the water flow rate to ensure that Accuracy of the water flow obtained.
  • steps S4 and S5 when the air source heat pump unit is in heating mode, the outlet water temperature of the water circulation circuit is obtained, and the outlet water temperature sensor 10 can convert the outlet water temperature into an output signal and transmit it to the controller ;
  • the controller controls the operating conditions of the refrigerant circulation circuit and the on-off state of the auxiliary electric heating device according to the received outlet water temperature.
  • the present invention does not impose any restrictions on the above-mentioned specific control methods, and technicians can set them by themselves according to actual use requirements, as long as the operating conditions of the refrigerant circulation loop and the auxiliary electric heating device are controlled according to the outlet water temperature
  • the opening and closing state of the outlet water temperature belongs to the protection scope of the present invention; and the present invention does not impose any restrictions on the specific acquisition method and acquisition position of the outlet water temperature, and technicians can set it according to the actual situation.
  • steps S6 and S7 when the air source heat pump unit is in the cooling condition, the low pressure in the refrigerant circulation circuit is obtained, and the low pressure sensor 7 can convert the low pressure into an output signal and transmit it to the controller
  • the controller controls the operating state of the compressor 1 and the operating state of the electronic expansion valve 4 according to the value range of the low pressure. It should be noted that the present invention does not impose any restrictions on the specific value range of the numerical range, which can be set through multiple tests, or can be set according to the actual operating conditions of the air source heat pump unit, and technicians can Set it yourself according to the actual situation.
  • Fig. 3 is a flow chart of specific steps of the first preferred embodiment of the control method of the present invention. As shown in Figure 3, based on the air source heat pump unit described in the above embodiments, the control method of the first preferred embodiment of the present invention includes the following steps:
  • step S101 to S103 when the air source heat pump unit starts to start, the controller first controls the circulating water pump 8 to start, preferably after the circulating water pump 8 runs for a preset operation time, then obtains the water flow in the water circulation loop, In order to effectively ensure that the second heat exchanger 5 is filled with enough water, thereby effectively avoiding the phenomenon of "emptying" in the second heat exchanger 5, specifically, if the water flow rate is greater than or equal to the preset water flow rate, then the The controller controls the operation of the refrigerant circulation loop.
  • the controller controls the circulating water pump 8 to continue to run and controls the refrigerant circulation loop not to run until the water flow rate is greater than Or equal to the preset water flow.
  • the preset running time is 2 to 3 minutes
  • the preset water flow rate is 70% of the standard water flow rate. It should be noted that the acquisition method of the water flow rate can be monitored by the water flow rate, and can also be monitored by the water inflow time.
  • the present invention does not make any limitation on the acquisition method of the water flow rate, and technicians can Self-setting, as a preferred setting method, the present invention monitors the flow rate of water through the flow meter 9, and then obtains the water flow rate in the water circulation circuit, and determines the water flow rate through the water flow rate to ensure that the obtained The accuracy of the water flow rate.
  • the setting of the standard water flow rate can be the default setting of the air source heat pump unit when it leaves the factory, or it can be set by the user according to the actual operating conditions, and the present invention does not make any restrictions on this , technicians can set it by themselves.
  • steps S104 and S105 when the air source heat pump unit is in heating mode, when the water circulation loop is started, the initial outlet water temperature of the water circulation loop is obtained, and after a preset running time, the The current outlet water temperature of the water circulation circuit, the outlet water temperature sensor 10 can convert the initial outlet water temperature and the current outlet water temperature into an output signal and transmit it to the controller, and then the controller, according to the received initial outlet water temperature and the current outlet water temperature signal to control the operating conditions of the refrigerant circulation loop and the on-off state of the auxiliary electric heating device.
  • the preset running time is set to 30 minutes. Of course, this is only a preferred setting value and is not limiting.
  • the actual operating status of the heat pump unit is set by itself. It should be noted that, the present invention does not impose any limitation on the way of obtaining the initial outlet water temperature and the current outlet water temperature, and technicians can set them according to the actual situation.
  • step S106 if the difference between the current outlet water temperature and the initial outlet water temperature is less than or equal to the preset outlet water temperature difference and the current outlet water temperature is less than or equal to the first preset outlet water temperature, control the refrigerant circulation loop The operating conditions of the electric heater remain unchanged and the auxiliary electric heating device is turned on.
  • steps S107 and S108 when the auxiliary electric heating device is turned on, the outlet water temperature of the water circulation circuit is obtained again, and when the obtained outlet water temperature is greater than the second preset outlet water temperature, the auxiliary electric heating device is turned off. Electric heating device.
  • the preset water temperature difference is preferably 5°C
  • the second preset water temperature is greater than the first preset water temperature, wherein the first preset water temperature is preferably 20°C
  • the second preset outlet water temperature is preferably 22°C.
  • the present invention does not impose any restrictions on the specific values of the preset outlet water temperature difference, the first preset outlet water temperature, and the second preset outlet water temperature. It can be obtained through multiple experiments, and can also be obtained through user's own setting, which is not restrictive, and technicians can set by themselves according to the actual situation.
  • the air source heat pump unit also includes a high and low pressure balancing branch, one end of the high and low pressure balancing branch is connected between the exhaust port of the compressor 1 and the four-way valve 2, and the other end is connected to the compressor 1 Between the gas inlet and the gas-liquid separator 6, a high and low pressure balance valve 11 is arranged on the high and low pressure balance branch.
  • step S109 when the air source heat pump unit starts to operate under the defrosting condition, the four-way valve 2 is controlled to change direction and the high and low pressure balance valve 11 is controlled to open for a preset protection period.
  • the second heat exchanger 5 The passing refrigerant and water will not cause a large alternation of cold and heat due to the switching of the working conditions of the air source heat pump unit, and the setting of the high and low pressure balance valve 11 can effectively ensure that the second heat exchanger 5 will not be cracked by freezing situation, thereby ensuring its service life.
  • the preset protection time is 30 seconds. Of course, this is only a preferred setting value, and it is not restrictive. A specific duration of the preset protection duration is set.
  • the present invention does not impose any restrictions on the specific timing of the air source heat pump unit entering the defrosting mode, and technicians can set it according to actual use requirements.
  • Fig. 4 is a flow chart of specific steps of the second preferred embodiment of the control method of the present invention. As shown in Figure 4, based on the air source heat pump unit described in the above embodiments, the control method in the second preferred embodiment of the present invention includes the following steps:
  • S205 Control the running state of the compressor and the running state of the electronic expansion valve according to the value range of the low pressure
  • the controller first controls the circulating water pump 8 to start, preferably after the circulating water pump 8 runs for a preset operation time, then obtains the water flow in the water circulation loop, In order to effectively ensure that the second heat exchanger 5 is filled with enough water, thereby effectively avoiding the phenomenon of "emptying" in the second heat exchanger 5, specifically, if the water flow rate is greater than or equal to the preset water flow rate, then the The controller controls the operation of the refrigerant circulation loop.
  • the controller controls the circulating water pump 8 to continue to run and controls the refrigerant circulation loop not to run until the water flow rate is greater than Or equal to the preset water flow.
  • the preset running time is 2 to 3 minutes
  • the preset water flow rate is 70% of the standard water flow rate. It should be noted that the acquisition method of the water flow rate can be monitored by the water flow rate, and can also be monitored by the water inflow time.
  • the present invention does not make any limitation on the acquisition method of the water flow rate, and technicians can Self-setting, as a preferred setting method, the present invention monitors the flow rate of water through the flow meter 9, and then obtains the water flow rate in the water circulation circuit, and determines the water flow rate through the water flow rate to ensure that the obtained The accuracy of the water flow rate.
  • the setting of the standard water flow rate can be the default setting of the air source heat pump unit when it leaves the factory, or it can be set by the user according to the actual operating conditions, and the present invention does not make any restrictions on this , technicians can set it by themselves.
  • steps S204 and S205 when the air source heat pump unit is in cooling mode, the low-pressure pressure of the refrigerant circulation circuit is obtained, and the low-pressure pressure sensor 7 can convert the low-pressure pressure into an output signal and transmit it to the A controller; then, the controller controls the operating state of the compressor 1 and the operating state of the electronic expansion valve 4 according to the value range of the low pressure.
  • the present invention does not impose any restrictions on the specific value range of the numerical range, which can be set through multiple tests, or can be set according to the actual operating conditions of the air source heat pump unit, and technicians can Set it yourself according to the actual situation.
  • steps S206 to S209 if the low pressure is less than the first preset low pressure and greater than or equal to the second preset low pressure for a first preset duration, the controller controls the operating frequency and The opening of the electronic expansion valve 4 remains unchanged; if the low pressure is greater than or equal to the first preset low pressure, the controller controls the air source heat pump unit to operate according to normal logic, that is, as long as the low pressure The pressure is greater than or equal to the first preset low pressure, the operating parameters of the air source heat pump unit can be adjusted at any time according to actual needs, and the specific control logic is not restrictive; if the low pressure is less than the second The preset low pressure is greater than or equal to the third preset low pressure and lasts for a second preset duration, the controller controls the operating frequency of the compressor 1 not to increase and controls the opening of the electronic expansion valve 4 to increase; if The low pressure is less than the third preset low pressure and greater than or equal to the fourth preset low pressure and lasts for a third preset time, then the controller controls the
  • the present invention does not impose any restrictions on the specific durations of the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration, which may be the same, It can also be different, and technicians can set it by themselves according to the actual operating conditions of the air source heat pump unit.
  • the specific durations of the first preset duration, the second preset duration, the third preset duration and the fourth preset duration are all 3 Minutes, that is, when the specific time exceeds 3 minutes, the second heat exchanger 5 will face the risk of freezing, but this is not restrictive.
  • the setting of the specific time Can be different.
  • the numerical values of the first preset low pressure, the second preset low pressure, the third preset low pressure and the fourth preset low pressure are not limiting, and technical Personnel can set it by themselves according to the multiple test results of the air source heat pump unit, as long as it is ensured that the second heat exchanger 5 will not be damaged due to freezing.

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Abstract

一种用于空气源热泵机组的控制方法，旨在解决现有空气源热泵机组的水侧换热器容易在使用过程中被冻裂的问题。为此通过将水循环回路中的水流量与预设水流量进行对比，以控制冷媒循环回路运行；通过获取空气源热泵机组处于制热工况时的水循环回路中的出水温度，来控制冷媒循环回路的运行工况和辅助电加热装置的开闭状态；通过获取空气源热泵机组处于制冷工况时的冷媒循环回路的低压压力，控制压缩机和电子膨胀阀的运行状态；进而有效保证在任何工况下第二换热器都不会受水流量过少、水温过低等因素的影响而导致其被冻裂的问题，以便保证其可靠性。

Description

用于空气源热泵机组的控制方法 技术领域
本发明涉及空气源热泵机组防冻技术领域，具体提供一种用于空气源热泵机组的控制方法。
背景技术
随着用户不断增长的需求，现有的换热器的发展趋近于精细化，体积小换热效率高，由此在空气源热泵机组中得到广泛应用。然而，如果现有水侧换热器内部经过的水流量不足或者水温过低，亦或在制冷过程中温度过低等因素均会导致水侧换热器被冻裂的问题。此外，现有的空气源热泵机组的室外换热器在制热过程中会出现结霜的情况，为了保证空气源热泵机组的制热效果，当室外换热器结霜达到一定程度后，空气源热泵机组将进入除霜工况，现有的空气源热泵机组大多采用逆向除霜的方式，但是，基于此种除霜方式，当空气源热泵机组切换至除霜工况时，其回路内的制冷剂会对水侧换热器造成较大的冷热冲击，由此易造成水侧换热器损坏。而在空气源热泵机组处于制冷工况时，如果其回路内的低压侧压力过低，那么当进入水侧换热器的制冷剂温度低于其冰点温度时，水侧换热器可能会出现冰冻涨裂现象，进而导致其无法使用。
发明内容
本发明旨在解决上述技术问题，即，解决现有空气源热泵机组的水侧换热器容易在运行过程中被冻裂的问题。
本发明提供一种用于空气源热泵机组的控制方法，所述空气源热泵机组包括冷媒循环回路、水循环回路和辅助电加热装置，所述冷媒循环回路上设置有压缩机、四通阀、第一换热器、电子膨胀阀和第二换热器，所述水循环回路上设置有循环水泵，所述冷媒循环回路和所述水循环回路能够通过所述第二换热器实现换热，所述辅助电加热装置能够对所述 水循环回路中的水进行加热，所述控制方法包括：在所述空气源热泵机组开始启动时，先控制所述循环水泵启动；获取所述水循环回路中的水流量；如果所述水流量大于或等于预设水流量，则控制所述冷媒循环回路运行；当所述空气源热泵机组处于制热工况时，获取所述水循环回路的出水温度；根据所述出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态；当所述空气源热泵机组处于制冷工况时，获取所述冷媒循环回路的低压压力；根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态。
在上述控制方法的优选技术方案中，“获取所述水循环回路的出水温度”的步骤具体包括：在所述水循环回路启动时，获取所述水循环回路的初始出水温度；经过预设运行时长后，获取所述水循环回路的当前出水温度；“根据所述出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态”的步骤具体包括：根据所述初始出水温度和所述当前出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态。
在上述控制方法的优选技术方案中，“根据所述初始出水温度和所述当前出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态”的步骤具体包括：如果所述当前出水温度和所述初始出水温度的差值小于或等于预设出水温差且所述当前出水温度小于或等于第一预设出水温度，则控制所述冷媒循环回路的运行工况不变且开启所述辅助电加热装置。
在上述控制方法的优选技术方案中，所述控制方法还包括：在所述辅助电加热装置开启的情形下，再次获取所述水循环回路的出水温度；当再次获取的所述出水温度大于第二预设出水温度时，关闭所述辅助电加热装置；其中，所述第二预设出水温度大于所述第一预设出水温度。
在上述控制方法的优选技术方案中，所述冷媒循环回路上还设置有高低压压力平衡阀，所述控制方法还包括：当所述空气源热泵机组开始运行除霜工况时，控制所述四通阀换向且控制所述高低压压力平衡阀开启。
在上述控制方法的优选技术方案中，“控制所述高低压压力平衡阀 开启”的步骤具体包括：控制所述高低压压力平衡阀开启预设保护时长。
在上述控制方法的优选技术方案中，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤包括：如果所述低压压力小于第一预设低压压力且大于或等于第二预设低压压力并持续第一预设时长，则控制所述压缩机的运行频率和所述电子膨胀阀的开度不变。
在上述控制方法的优选技术方案中，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤还包括：如果所述低压压力小于所述第二预设低压压力且大于或等于第三预设低压压力并持续第二预设时长，则控制所述压缩机的运行频率不得升高且控制所述电子膨胀阀的开度增大。
在上述控制方法的优选技术方案中，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤还包括：如果所述低压压力小于所述第三预设低压压力且大于或等于第四预设低压压力并持续第三预设时长，则控制所述压缩机的运行频率降低且控制所述电子膨胀阀的开度增大。
在上述控制方法的优选技术方案中，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤还包括：如果所述低压压力小于所述第四预设低压压力并持续第四预设时长，则控制所述压缩机和所述电子膨胀阀关闭。
在采用上述技术方案的情况下，本发明能够通过将所述水循环回路中的水流量与预设水流量进行对比，如果所述水流量大于或等于所述预设水流量，则控制所述冷媒循环回路运行，还能够通过获取所述空气源热泵机组处于制热工况时的所述水循环回路中的出水温度控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态，通过获取所述空气源热泵机组处于制冷工况时的所述冷媒循环回路的低压压力控制所述压缩机的运行状态和所述电子膨胀阀的运行状态，因此，所述控制方法能够有效保证在任何工况下所述第二换热器都不会受水流量过少、水温过低等因素原因的影响而导致其被冻裂的问题，以便有效保证其可靠性。
附图说明
下面结合附图来描述本发明的优选实施方式，附图中：
图1是本发明的空气源热泵机组的结构示意图；
图2是本发明的控制方法的主要步骤流程图；
图3是本发明的控制方法的第一优选实施例的具体步骤流程图；
图4是本发明的控制方法的第二优选实施例的具体步骤流程图；
附图标记：
1、压缩机；2、四通阀；3、第一换热器；4、电子膨胀阀；5、第二换热器；6、气液分离器；7、低压压力传感器；8、循环水泵；9、流量计；10、出水温度传感器；11、高低压压力平衡阀。
具体实施方式
下面参照附图来描述本发明的优选实施方式。本领域技术人员应当理解的是，这些实施方式仅用于解释本发明的技术原理，并非旨在限制本发明的保护范围。本领域技术人员可以根据需要对其作出调整，以便适应具体的应用场合。例如，本发明中所述的空气源热泵机组可以是分体式空气源热泵机组，也可以是整体式空气源热泵机组，这都不是限制性的，技术人员可以根据实际使用需求自行设定本发明的控制方法的应用对象。这种有关应用对象的改变并不偏离本发明的基本原理，属于本发明的保护范围。
需要说明的是，在本优选实施方式的描述中，除非另有明确的规定和限定，术语“连接”应做广义理解，例如，可以是直接相连，也可以通过中间媒介间接相连，还可以是两个元件内部的连通，因此不能理解为对本发明的限制。对于本领域技术人员而言，可根据具体情况理解上述术语在本发明中的具体含义。
此外，还需要说明的是，在本发明的描述中，尽管本申请中按照特定顺序描述了本发明的控制方法的各个步骤，但是这些顺序并不是限制性的，在不偏离本发明的基本原理的前提下，本领域技术人员可以按照不同的顺序来执行所述步骤。
具体地，首先参阅图1，图1是本发明的空气源热泵机组的结构示意图。如图1所示，本发明的空气源热泵机组包括冷媒循环回路、水循环回路和辅助电加热装置(图中未示出)，所述冷媒循环回路上设置有压缩机1、四通阀2、第一换热器3、电子膨胀阀4、第二换热器5和气液分离器6，低压压力传感器7设置在压缩机1的进气口处，当然，具体设置位置不限；所述水循环回路上设置有循环水泵8和流量计9，循环水泵8和流量计9设置在第二换热器5的进水侧，出水温度传感器10设置在第二换热器5的出水侧，以便检测流经第二换热器5后的所述水循环回路中的水的温度；需要说明的是，虽然图中所示的水循环回路是开放式的，但这仅是示意性的，并且所述水循环回路上也可以设置有进水口和取水口以和外界交换冷冻水。所述冷媒循环回路和所述水循环回路能够通过第二换热器5实现换热，所述辅助电加热装置能够对所述水循环回路中的水进行加热。
需要说明的是，本发明不对第一换热器3、第二换热器5、低压压力传感器7和出水温度传感器10的具体类型作任何限制，第一换热器3和第二换热器5可以是板式换热器，也可以是套管式换热器，低压压力传感器7可以是电容式压力传感器，也可以是压阻式压力传感器，还可以是压电式压力传感器，出水温度传感器10可以是热敏传感器，也可以是热偶传感器，技术人员可以根据实际情况自行设定。
此外，本发明的空气源热泵机组设置有制热工况、制冷工况和除霜工况，具体地，当所述空气源热泵机组处于制热工况时，第一换热器3用作蒸发器，第二换热器5用作冷凝器；当所述空气源热泵机组处于制冷工况和除霜工况时，第一换热器3用作冷凝器，第二换热器5用作蒸发器。当然，需要说明的是，本发明并不对所述空气源热泵机组设置的具体工况种类作任何限制，其显然还可以设置有其他工况，技术人员可以根据实际情况自行设定。
进一步地，本发明的空气源热泵机组还包括控制器，所述控制器能够执行本发明的控制方法，例如：所述控制器能够控制所述冷媒循环回路的运行工况，控制所述辅助电加热装置的开闭状态，控制压缩机1、电子膨胀阀4和循环水泵8的运行状态等。本领域技术人员能够理解的是， 本发明不对所述控制器的具体结构和型号作任何限制，并且所述控制器既可以是所述空气源热泵机组原有的控制器，也可以是为执行本发明的控制方法单独设置的控制器，技术人员可以根据实际使用需求自行设定所述控制器的结构和型号。
接下来参阅图2，图2是本发明的控制方法的主要步骤流程图。如图2所示，基于上述实施例中所述的空气源热泵机组，本发明的控制方法包括下列步骤：
S1：在空气源热泵机组开始启动时，先控制循环水泵启动；
S2：获取水循环回路中的水流量；
S3：如果水流量大于或等于预设水流量，则控制冷媒循环回路运行；
S4：当空气源热泵机组处于制热工况时，获取水循环回路的出水温度；
S5：根据出水温度，控制冷媒循环回路的运行工况和辅助电加热装置的开闭状态；
S6：当空气源热泵机组处于制冷工况时，获取冷媒循环回路的低压压力；
S7：根据低压压力所处的数值范围，控制压缩机的运行状态和电子膨胀阀的运行状态。
在步骤S1至S3中，在空气源热泵机组开始启动时，所述控制器先控制循环水泵8启动，之后获取所述水循环回路中的水流量，如果所述水流量大于或等于预设水流量，则所述控制器控制所述冷媒循环回路运行。需要说明的是，本发明不对所述预设水流量的具体取值作任何限制，技术人员可以根据实际使用需求自行设定；优选地，所述预设水流量为标准水流量的70％，所述标准水流量为机组稳定运行时的水流量。
此外，还需要说明的是，所述水流量的获取方式可以通过水的流速进行监测，也可以通过进水时间进行监测，本发明不对所述水流量的获取方式作任何限定，技术人员可以根据实际的情况自行设定，作为一种优选的设定方式，本发明通过流量计9监测水的流速，进而获取所述水循环回路中的水流量，通过水的流速来确定所述水流量能够保证获取的所述水流量的准确性。
在步骤S4和S5中，当所述空气源热泵机组处于制热工况时，获取所述水循环回路的出水温度，出水温度传感器10能够将所述出水温度转化为输出信号传递给所述控制器；接着，所述控制器根据接收的所述出水温度控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态。需要说明的是，本发明不对上述具体控制方式作任何限制，技术人员可以根据实际使用需求自行设定，只要根据所述出水温度控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态就属于本发明的保护范围；并且本发明不对所述出水温度的具体获取方式和获取位置作任何限制，技术人员可以根据实际的情况自行设定。
在步骤S6和S7中，当所述空气源热泵机组处于制冷工况时，获取所述冷媒循环回路中的低压压力，低压压力传感器7能够将所述低压压力转化为输出信号传递给所述控制器；接着，所述控制器根据所述低压压力所处的数值范围，控制压缩机1的运行状态和电子膨胀阀4的运行状态。需要说明的是，本发明并不对所述数值范围的具体取值范围作任何限制，其可以通过多次试验设定，也可以根据所述空气源热泵机组的实际运行状况设定，技术人员可以根据实际的情况自行设定。
第一优选实施例
参阅图3，图3是本发明的控制方法的第一优选实施例的具体步骤流程图。如图3所示，基于上述实施例中所述的空气源热泵机组，本发明第一优选实施例的控制方法包括下列步骤：
S101：在空气源热泵机组开始启动时，先控制循环水泵启动；
S102：获取水循环回路中的水流量；
S103：如果水流量大于或等于预设水流量，则控制冷媒循环回路运行；
S104：在空气源热泵机组处于制热工况的情形下，当水循环回路启动时，获取水循环回路的初始出水温度；
S105：经过预设运行时长后，获取水循环回路的当前出水温度；
S106：如果当前出水温度和初始出水温度的差值小于或等于预设出水温差且当前出水温度小于或等于第一预设出水温度，则控制冷媒循环回路的运行工况不变且开启辅助电加热装置；
S107：在辅助电加热装置开启的情形下，再次获取水循环回路的出水温度；
S108：当再次获取的出水温度大于第二预设出水温度时，关闭辅助电加热装置；
S109：当空气源热泵机组开始运行除霜工况时，控制四通阀换向且控制高低压压力平衡阀开启预设保护时长。
在步骤S101至S103中，在空气源热泵机组开始启动时，所述控制器先控制循环水泵8启动，优选在循环水泵8运行预设运转时长后，再获取所述水循环回路中的水流量，以便有效保证第二换热器5中已经充满足够多的水，进而有效避免第二换热器5出现“排空”现象，具体为如果所述水流量大于或等于预设水流量，则所述控制器控制所述冷媒循环回路运行，如果所述水流量小于所述预设水流量，则所述控制器控制循环水泵8继续运转且控制所述冷媒循环回路不得运行直至所述水流量大于或等于所述预设水流量。在本优选实施例中，所述预设运转时长为2至3分钟，所述预设水流量为标准水流量的70％。需要说明的是，所述水流量的获取方式可以通过水的流速进行监测，也可以通过进水时间进行监测，本发明不对所述水流量的获取方式作任何限定，技术人员可以根据实际的情况自行设定，作为一种优选的设定方式，本发明通过流量计9监测水的流速，进而获取所述水循环回路中的水流量，通过水的流速来确定所述水流量能够保证获取的所述水流量的准确性。还需要说明的是，所述标准水流量的设定可以是所述空气源热泵机组出厂时默认设定的，也可以是用户根据实际运行情况自行设定的，本发明对此并不作任何限制，技术人员可以自行设定。
在步骤S104和S105中，在所述空气源热泵机组处于制热工况的情形下，当所述水循环回路启动时，获取所述水循环回路的初始出水温度，经过预设运行时长后，获取所述水循环回路的当前出水温度，出水温度传感器10能够将所述初始出水温度和所述当前出水温度转化为输出信号传递给所述控制器，接着，所述控制器根据接收的所述初始出水温度和所述当前出水温度的信号控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态。在本优选实施例中，根据多次试验结果，所述 预设运行时长设定为30分钟，当然，这仅是优选的设定值，并不是限制性的，技术人员可以根据所述空气源热泵机组的实际运行状况自行设定。需要说明的是，本发明也不对所述初始出水温度和所述当前出水温度的获取方式作任何限制，技术人员可以根据实际的情况自行设定。
在步骤S106中，如果所述当前出水温度和所述初始出水温度的差值小于或等于预设出水温差且所述当前出水温度小于或等于第一预设出水温度，则控制所述冷媒循环回路的运行工况不变且开启所述辅助电加热装置。
在步骤S107和S108中，在所述辅助电加热装置开启的情形下，再次获取所述水循环回路的出水温度，当再次获取的所述出水温度大于第二预设出水温度时，关闭所述辅助电加热装置。
在本实施例中，所述预设出水温差优选为5℃，所述第二预设出水温度大于所述第一预设出水温度，其中，所述第一预设出水温度优选为20℃，所述第二预设出水温度优选为22℃，当然，本发明并不对所述预设出水温差、所述第一预设出水温度和所述第二预设出水温度的具体数值作任何限制，其可以通过多次试验获得，也可以通过用户自行设定获得，这都不是限制性的，技术人员可以根据实际的情形自行设定。
优选地，所述空气源热泵机组还包括高低压平衡支路，所述高低压平衡支路的一端连接至压缩机1的排气口和四通阀2之间，另一端连接至压缩机1的进气口和气液分离器6之间，所述高低压平衡支路上设置有高低压压力平衡阀11。在步骤S109中，当所述空气源热泵机组开始运行除霜工况时，控制四通阀2换向且控制高低压压力平衡阀11开启预设保护时长，因此，第二换热器5中经过的冷媒和水不会因为所述空气源热泵机组工况的切换而产生较大的冷热交替，高低压压力平衡阀11的设置能够有效保证第二换热器5不会产生冻裂的情况，进而保证其使用寿命。在本优选实施例中，经过多次试验，所述预设保护时长为30秒，当然，这仅是优选的设定值，并不是限制性的，技术人员可以根据不同的空气源热泵机组自行设定所述预设保护时长的具体时长。
此外，还需要说明的是，本发明不对所述空气源热泵机组进入除霜工况的具体时机作任何限制，技术人员可以根据实际使用需求自行设定。
第二优选实施例
参阅图4，图4是本发明的控制方法的第二优选实施例的具体步骤流程图。如图4所示，基于上述实施例中所述的空气源热泵机组，本发明第二优选实施例的控制方法包括下列步骤：
S201：在空气源热泵机组开始启动时，先控制循环水泵启动；
S202：获取水循环回路中的水流量；
S203：如果水流量大于或等于预设水流量，则控制冷媒循环回路运行；
S204：当空气源热泵机组处于制冷工况时，获取冷媒循环回路的低压压力；
S205：根据低压压力所处的数值范围，控制压缩机的运行状态和电子膨胀阀的运行状态；
S206：如果低压压力小于第一预设低压压力且大于或等于第二预设低压压力并持续第一预设时长，则控制压缩机的运行频率和电子膨胀阀的开度不变；
S207：如果低压压力小于第二预设低压压力且大于或等于第三预设低压压力并持续第二预设时长，则控制压缩机的运行频率不得升高且控制电子膨胀阀的开度增大；
S208：如果低压压力小于第三预设低压压力且大于或等于第四预设低压压力并持续第三预设时长，则控制压缩机的运行频率降低且控制电子膨胀阀的开度增大；
S209：如果低压压力小于第四预设低压压力并持续第四预设时长，则控制压缩机和电子膨胀阀关闭。
在步骤S201至S203中，在空气源热泵机组开始启动时，所述控制器先控制循环水泵8启动，优选在循环水泵8运行预设运转时长后，再获取所述水循环回路中的水流量，以便有效保证第二换热器5中已经充满足够多的水，进而有效避免第二换热器5出现“排空”现象，具体为如果所述水流量大于或等于预设水流量，则所述控制器控制所述冷媒循环回路运行，如果所述水流量小于所述预设水流量，则所述控制器控制循环水泵8继续运转且控制所述冷媒循环回路不得运行直至所述水流量 大于或等于所述预设水流量。在本优选实施例中，所述预设运转时长为2至3分钟，所述预设水流量为标准水流量的70％。需要说明的是，所述水流量的获取方式可以通过水的流速进行监测，也可以通过进水时间进行监测，本发明不对所述水流量的获取方式作任何限定，技术人员可以根据实际的情况自行设定，作为一种优选的设定方式，本发明通过流量计9监测水的流速，进而获取所述水循环回路中的水流量，通过水的流速来确定所述水流量能够保证获取的所述水流量的准确性。还需要说明的是，所述标准水流量的设定可以是所述空气源热泵机组出厂时默认设定的，也可以是用户根据实际运行情况自行设定的，本发明对此并不作任何限制，技术人员可以自行设定。
在步骤S204和S205中，在所述空气源热泵机组处于制冷工况的情形下，获取所述冷媒循环回路的低压压力，低压压力传感器7能够将所述低压压力转化为输出信号传递给所述控制器；接着，所述控制器根据所述低压压力所处的数值范围，控制压缩机1的运行状态和电子膨胀阀4的运行状态。需要说明的是，本发明并不对所述数值范围的具体取值范围作任何限制，其可以通过多次试验设定，也可以根据所述空气源热泵机组的实际运行状况设定，技术人员可以根据实际的情况自行设定。
在步骤S206至S209中，如果所述低压压力小于第一预设低压压力且大于或等于第二预设低压压力并持续第一预设时长，则所述控制器控制压缩机1的运行频率和电子膨胀阀4的开度不变；如果所述低压压力大于或等于所述第一预设低压压力，则所述控制器控制所述空气源热泵机组按照正常逻辑运转，即，只要所述低压压力大于或等于所述第一预设低压压力，所述空气源热泵机组的运行参数可以根据实际需求随时自行调节，其具体控制逻辑并不是限制性的；如果所述低压压力小于所述第二预设低压压力且大于或等于第三预设低压压力并持续第二预设时长，则所述控制器控制压缩机1的运行频率不得升高且控制电子膨胀阀4的开度增大；如果所述低压压力小于所述第三预设低压压力且大于或等于第四预设低压压力并持续第三预设时长，则所述控制器控制压缩机1的运行频率降低且控制电子膨胀阀4的开度增大；如果所述低压压力小于所述第四预设低压压力并持续第四预设时长，则所述控制器控制压缩 机1和电子膨胀阀4关闭，即所述空气源热泵机组停止运转，由此，能够有效保证第二换热器5不会在制冷工况下被冻坏，进而有效保证了其使用寿命不会因受冻而缩短。
需要说明的是，本发明不对所述第一预设时长、所述第二预设时长、所述第三预设时长和所述第四预设时长的具体时长作任何限制，其可以相同，也可以不同，技术人员可以根据所述空气源热泵机组的实际运行情况自行设定。在本优选实施例中，经过多次试验获得，所述第一预设时长、所述第二预设时长、所述第三预设时长和所述第四预设时长的具体时长均为3分钟，即，当所述具体时长超过3分钟时，第二换热器5将面临冻坏的风险，但这并不是限制性的，对于不同的空气源热泵机组，所述具体时长的设定可以不同。
还需要说明的是，所述第一预设低压压力、所述第二预设低压压力、所述第三预设低压压力和所述第四预设低压压力的数值也不是限制性的，技术人员可以根据所述空气源热泵机组的多次试验结果自行设定，只要保证第二换热器5不会因为冻结而发生损坏即可。
至此，已经结合附图所示的优选实施方式描述了本发明的技术方案，但是，本领域技术人员容易理解的是，本发明的保护范围显然不局限于这些具体实施方式。在不偏离本发明的原理的前提下，本领域技术人员可以对相关技术特征作出等同的更改或替换，这些更改或替换之后的技术方案都将落入本发明的保护范围之内。

Claims (10)

  1. 一种用于空气源热泵机组的控制方法，其特征在于，所述空气源热泵机组包括冷媒循环回路、水循环回路和辅助电加热装置，所述冷媒循环回路上设置有压缩机、四通阀、第一换热器、电子膨胀阀和第二换热器，所述水循环回路上设置有循环水泵，所述冷媒循环回路和所述水循环回路能够通过所述第二换热器实现换热，所述辅助电加热装置能够对所述水循环回路中的水进行加热，所述控制方法包括：
    在所述空气源热泵机组开始启动时，先控制所述循环水泵启动；
    获取所述水循环回路中的水流量；
    如果所述水流量大于或等于预设水流量，则控制所述冷媒循环回路运行；
    当所述空气源热泵机组处于制热工况时，获取所述水循环回路的出水温度；
    根据所述出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态；
    当所述空气源热泵机组处于制冷工况时，获取所述冷媒循环回路的低压压力；
    根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态。
  2. 根据权利要求1所述的控制方法，其特征在于，“获取所述水循环回路的出水温度”的步骤具体包括：
    在所述水循环回路启动时，获取所述水循环回路的初始出水温度；
    经过预设运行时长后，获取所述水循环回路的当前出水温度；
    “根据所述出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态”的步骤具体包括：
    根据所述初始出水温度和所述当前出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态。
  3. 根据权利要求2所述的控制方法，其特征在于，“根据所述初始出水温度和所述当前出水温度，控制所述冷媒循环回路的运行工况和所述辅助电加热装置的开闭状态”的步骤具体包括：
    如果所述当前出水温度和所述初始出水温度的差值小于或等于预设出水温差且所述当前出水温度小于或等于第一预设出水温度，则控制所述冷媒循环回路的运行工况不变且开启所述辅助电加热装置。
  4. 根据权利要求3所述的控制方法，其特征在于，所述控制方法还包括：
    在所述辅助电加热装置开启的情形下，再次获取所述水循环回路的出水温度；
    当再次获取的所述出水温度大于第二预设出水温度时，关闭所述辅助电加热装置；
    其中，所述第二预设出水温度大于所述第一预设出水温度。
  5. 根据权利要求4所述的控制方法，其特征在于，所述冷媒循环回路上还设置有高低压压力平衡阀，所述控制方法还包括：
    当所述空气源热泵机组开始运行除霜工况时，控制所述四通阀换向且控制所述高低压压力平衡阀开启。
  6. 根据权利要求5所述的控制方法，其特征在于，“控制所述高低压压力平衡阀开启”的步骤具体包括：
    控制所述高低压压力平衡阀开启预设保护时长。
  7. 根据权利要求1至6中任一项所述的控制方法，其特征在于，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤包括：
    如果所述低压压力小于第一预设低压压力且大于或等于第二预设低压压力并持续第一预设时长，则控制所述压缩机的运行频率和所述电子膨胀阀的开度不变。
  8. 根据权利要求7所述的控制方法，其特征在于，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤还包括：
    如果所述低压压力小于所述第二预设低压压力且大于或等于第三预设低压压力并持续第二预设时长，则控制所述压缩机的运行频率不得升高且控制所述电子膨胀阀的开度增大。
  9. 根据权利要求8所述的控制方法，其特征在于，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤还包括：
    如果所述低压压力小于所述第三预设低压压力且大于或等于第四预设低压压力并持续第三预设时长，则控制所述压缩机的运行频率降低且控制所述电子膨胀阀的开度增大。
  10. 根据权利要求9所述的控制方法，其特征在于，“根据所述低压压力所处的数值范围，控制所述压缩机的运行状态和所述电子膨胀阀的运行状态”的步骤还包括：
    如果所述低压压力小于所述第四预设低压压力并持续第四预设时长，则控制所述压缩机和所述电子膨胀阀关闭。
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CN113623889B (zh) * 2021-07-30 2023-03-31 青岛海尔空调电子有限公司 用于空气源热泵机组的控制方法
CN114992778B (zh) * 2022-05-23 2024-02-20 青岛海尔空调电子有限公司 空调机组的防冻控制方法
CN115183405A (zh) * 2022-07-08 2022-10-14 青岛海尔空调电子有限公司 用于空气源热泵机组防冻的方法及装置、空气源热泵机组、存储介质
CN115289611A (zh) * 2022-07-08 2022-11-04 青岛海尔空调电子有限公司 用于空气源热泵机组防冻的方法及装置、空气源热泵机组、存储介质
CN115183403A (zh) * 2022-07-08 2022-10-14 青岛海尔空调电子有限公司 用于空气源热泵机组防冻的方法及装置、空气源热泵机组、存储介质
CN115823786A (zh) * 2022-12-08 2023-03-21 珠海格力电器股份有限公司 一种机组防冻控制方法、装置及冷水机组

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