CN114151929A - Heat pump air conditioning unit, anti-freezing control method and device thereof and storage medium - Google Patents

Heat pump air conditioning unit, anti-freezing control method and device thereof and storage medium Download PDF

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Publication number
CN114151929A
CN114151929A CN202111488413.5A CN202111488413A CN114151929A CN 114151929 A CN114151929 A CN 114151929A CN 202111488413 A CN202111488413 A CN 202111488413A CN 114151929 A CN114151929 A CN 114151929A
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CN
China
Prior art keywords
frequency
freezing
water temperature
variable
temperature
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Pending
Application number
CN202111488413.5A
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Chinese (zh)
Inventor
曹巍
李天阳
尚瑞
李思佳
陈志杰
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202111488413.5A priority Critical patent/CN114151929A/en
Publication of CN114151929A publication Critical patent/CN114151929A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/43—Defrosting; Preventing freezing of indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

Abstract

The invention provides a heat pump air conditioning unit, an anti-freezing control method and device thereof, and a storage medium, wherein the method comprises the following steps: when the heat pump air conditioning unit operates in a refrigerating mode, the outlet water temperature of an inner machine heat exchanger and the inlet water temperature of a variable-frequency hydraulic module are detected; and controlling the heat pump air conditioning unit to normally perform refrigeration operation, execute anti-freezing operation control operation or stop operation according to the detected outlet water temperature of the heat exchanger of the internal machine and the inlet water temperature of the variable-frequency hydraulic module. The scheme provided by the invention can more quickly and effectively control the water temperature, thereby more effectively reducing the starting and stopping times of the compressor and improving the system performance.

Description

Heat pump air conditioning unit, anti-freezing control method and device thereof and storage medium
Technical Field
The invention relates to the field of control, in particular to a heat pump air conditioning unit, an anti-freezing control method and device thereof and a storage medium.
Background
When the heat pump unit is used for refrigerating, because the use side (the inner machine side of the split unit, which generates cold water or hot water to achieve the purpose of refrigerating or heating through the cold water or the hot water) is water, the heat exchanger of the inner machine of the heat pump unit and the connecting water pipe thereof can be frozen and cracked under the condition of too low evaporation temperature, and therefore, the problem of freeze prevention must be considered.
Disclosure of Invention
The invention mainly aims to overcome the defects of the related technologies and provides a heat pump air conditioning unit, an anti-freezing control method and device thereof and a storage medium, so as to solve the problem that an indoor unit heat exchanger and a connecting water pipe thereof are likely to be frozen and cracked under the condition that the evaporation temperature is too low during the refrigeration operation of the heat pump unit in the related technologies.
The invention provides an anti-freezing control method for a heat pump air conditioning unit, which comprises the following steps: when the heat pump air conditioning unit operates in a refrigerating mode, the outlet water temperature of an inner machine heat exchanger and the inlet water temperature of a variable-frequency hydraulic module are detected; and controlling the heat pump air conditioning unit to normally perform refrigeration operation, execute anti-freezing operation control operation or stop operation according to the detected outlet water temperature of the heat exchanger of the internal machine and the inlet water temperature of the variable-frequency hydraulic module.
Optionally, the heat pump air conditioning unit is controlled to normally perform refrigeration operation, execute anti-freezing operation control operation or stop operation according to the detected outlet water temperature of the heat exchanger of the internal machine and the inlet water temperature of the variable-frequency hydraulic module, and the method comprises the following steps: when the outlet water temperature of the inner machine heat exchanger is detected to be higher than a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to normally perform refrigeration operation; when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute anti-freezing operation control operation; and when the outlet water temperature of the indoor unit heat exchanger is detected to be less than or equal to zero and the inlet water temperature of the variable-frequency hydraulic module is detected to be less than or equal to zero, controlling the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running, and reporting an anti-freezing protection fault.
Optionally, the anti-freeze operation control operation comprises: at least one of the first anti-freeze operation control operation, the second anti-freeze operation control operation, and the third anti-freeze control operation; when the temperature of the outlet water of the indoor unit heat exchanger is detected to be higher than a first anti-freezing junction temperature and lower than or equal to a second anti-freezing junction temperature, and the temperature of the inlet water of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to execute a first anti-freezing operation control operation; when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a first anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation; when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, if the heat pump air conditioning unit is in an oil return state, the heat pump air conditioning unit is controlled to execute a third anti-freezing operation control operation; wherein the second anti-freezing junction temperature is greater than the first anti-freezing junction temperature.
Optionally, a first anti-freeze operation control operation is performed, comprising: controlling the running frequency of a compressor to increase a first preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a second preset frequency; performing a second anti-freeze operation control operation comprising: controlling the running frequency of the compressor to increase a third preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a fourth preset frequency; executing a third freeze prevention operation control operation comprising: controlling the frequency of the variable-frequency hydraulic module to rise to a preset highest frequency for operation; the third preset frequency is greater than the first preset frequency, and the fourth preset frequency is greater than the second preset frequency.
Optionally, the method further comprises: after controlling the heat pump air conditioning unit to execute a first anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; if the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, the anti-freezing operation control is quitted; if the outlet water temperature of the indoor unit heat exchanger is detected to be less than the sum of the second anti-freezing junction temperature and the preset temperature, or the inlet water temperature of the variable-frequency hydraulic module is detected to be less than zero, the running frequency of the compressor is controlled to be increased by the first preset frequency again, and/or the frequency of the variable-frequency hydraulic module is controlled to be increased by the second preset frequency again until the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, the anti-freezing running control is quitted; and/or after controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; if the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero is detected, the anti-freezing operation control is quit; if the outlet water temperature of the indoor unit heat exchanger is detected to be less than the sum of the second anti-freezing junction temperature and the preset temperature, or the inlet water temperature of the variable-frequency hydraulic module is detected to be less than zero, the running frequency of the compressor is controlled to be increased by a third preset frequency again, and/or the frequency of the variable-frequency hydraulic module is controlled to be increased by a fourth preset frequency again until the outlet water temperature of the indoor unit heat exchanger is detected to be more than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the anti-freezing running control is quitted if the inlet water temperature of the variable-frequency hydraulic module is detected to be more than zero; and/or after controlling the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running for a first preset time, detecting whether the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; if the outlet water temperature of the inner machine heat exchanger is detected to be greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to start up for operation; and/or after the heat pump air conditioning unit is controlled to execute the third freezing prevention operation control operation and after the oil return is finished and the oil return state is quitted for the second preset time, the anti-freezing operation control is quitted, and the heat pump air conditioning unit is controlled to normally perform the refrigeration operation.
In another aspect, the present invention provides an anti-freezing control device for a heat pump air conditioning unit, including: the detection unit is used for detecting the outlet water temperature of the heat exchanger of the inner machine and the inlet water temperature of the variable-frequency hydraulic module when the heat pump air conditioning unit operates in a refrigerating mode; and the control unit is used for controlling the heat pump air conditioning unit to normally perform refrigeration operation, execute anti-freezing operation control operation or stop operation according to the detected outlet water temperature of the inner machine heat exchanger and the inlet water temperature of the variable-frequency hydraulic module.
Optionally, the control unit controls normal refrigeration operation, anti-freezing operation control execution or stop operation of the heat pump air conditioning unit according to the detected outlet water temperature of the inner machine heat exchanger and the inlet water temperature of the variable-frequency hydraulic module, and includes: when the outlet water temperature of the inner machine heat exchanger is detected to be higher than a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to normally perform refrigeration operation; when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute anti-freezing operation control operation; and when the outlet water temperature of the indoor unit heat exchanger is detected to be less than or equal to zero and the inlet water temperature of the variable-frequency hydraulic module is detected to be less than or equal to zero, controlling the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running, and reporting an anti-freezing protection fault.
Optionally, the anti-freeze operation control operation comprises: at least one of the first anti-freeze operation control operation, the second anti-freeze operation control operation, and the third anti-freeze control operation; when the temperature of the outlet water of the indoor unit heat exchanger is detected to be higher than a first anti-freezing junction temperature and lower than or equal to a second anti-freezing junction temperature, and the temperature of the inlet water of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to execute a first anti-freezing operation control operation; when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a first anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation; when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, if the heat pump air conditioning unit is in an oil return state, the heat pump air conditioning unit is controlled to execute a third anti-freezing operation control operation; wherein the second anti-freezing junction temperature is greater than the first anti-freezing junction temperature.
Optionally, the control unit performs a first anti-freeze operation control operation, including: controlling the running frequency of a compressor to increase a first preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a second preset frequency; the control unit performs a second anti-freeze operation control operation, including: controlling the running frequency of the compressor to increase a third preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a fourth preset frequency; the control unit executes a third freeze prevention operation control operation including: controlling the frequency of the variable-frequency hydraulic module to rise to a preset highest frequency for operation; the third preset frequency is greater than the first preset frequency, and the fourth preset frequency is greater than the second preset frequency.
Optionally, the method further comprises: the detection unit is further configured to: after the control unit controls the heat pump air conditioning unit to execute a first anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; the control unit is further configured to: if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the anti-freezing operation control is quitted; if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is less than the sum of the second anti-freezing junction temperature and the preset temperature or the inlet water temperature of the variable-frequency hydraulic module is less than zero, controlling the running frequency of the compressor to increase the first preset frequency again and/or controlling the frequency of the variable-frequency hydraulic module to increase the second preset frequency until the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, and quitting the anti-freezing running control; and/or the detection unit is further configured to: after the control unit controls the heat pump air conditioning unit to execute a second anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; the control unit is further configured to: if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the anti-freezing operation control is quitted; if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is less than the sum of the second anti-freezing junction temperature and the preset temperature or the inlet water temperature of the variable-frequency hydraulic module is less than zero, controlling the running frequency of the compressor to increase by a third preset frequency again and/or controlling the frequency of the variable-frequency hydraulic module to increase by a fourth preset frequency until the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is more than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is more than zero, and quitting the anti-freezing running control; and/or the detection unit is further configured to: after the control unit controls the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running for a first preset time, detecting whether the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; the control unit is further configured to: if the detection unit detects that the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, controlling the heat pump air conditioning unit to start up for operation; and/or the control unit is further configured to: and after the heat pump air conditioning unit is controlled to execute the third freezing prevention operation control operation and the oil return is finished, the heat pump air conditioning unit quits the anti-freezing operation control after quitting the oil return state for a second preset time, and the heat pump air conditioning unit is controlled to normally perform the refrigerating operation.
A further aspect of the invention provides a storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of any of the methods described above.
In yet another aspect, the present invention provides a heat pump air conditioning unit, comprising a processor, a memory, and a computer program stored in the memory and operable on the processor, wherein the processor executes the computer program to implement the steps of any of the methods described above.
The invention further provides a heat pump air conditioning unit, which comprises the anti-freezing control device for the heat pump air conditioning unit.
According to the technical scheme of the invention, the control of the variable-frequency hydraulic module is added, and the water temperature can be controlled more quickly and effectively through the combined control of the variable-frequency hydraulic module and the compressor, so that the starting and stopping times of the compressor are more effectively reduced, and the system performance, reliability and user comfort are improved. Meanwhile, the problem that the anti-freezing protection is invalid due to drift or fault of a single temperature sensing bulb can be prevented.
The control of the variable-frequency hydraulic module is increased, compared with the control of a fan, a compressor, a bypass valve and a throttle valve, the influence on the water temperature is quicker and more direct, and the problems that the startup and shutdown operations of the compressor are required when the compressor is prevented from freezing at every time, the startup and shutdown times of the compressor are multiple, and the service lives of the compressor and an air conditioner are shortened are effectively solved. Whether the anti-freezing protection is started or not is judged through the outlet water temperature of the inner machine heat exchanger and the inlet water temperature of the variable-frequency hydraulic module, so that the anti-freezing protection failure caused by drifting or faults of the anti-freezing temperature sensing package can be prevented. In the oil return process of the unit, when the compressor runs according to the oil return frequency, whether the compressor enters anti-freezing protection can be judged, and the machine is prevented from being shut down due to the anti-freezing protection during oil return.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a method for controlling anti-freezing of a heat pump air conditioning unit according to an embodiment of the present invention;
FIG. 2 is a system flow diagram of a heat pump air conditioning unit according to an embodiment of the present invention;
FIG. 3 is a flowchart of an embodiment of an anti-freezing control method for a heat pump air conditioning unit according to the present invention;
FIG. 4 is a flowchart of another embodiment of the freeze control method for a heat pump air conditioning unit according to the present invention;
FIG. 5 illustrates an anti-freeze control strategy in the oil return state of the heat pump unit according to the present invention;
fig. 6 is a block diagram illustrating a structure of an anti-freezing control device for a heat pump air conditioning unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 2 is a system flow diagram of a heat pump air conditioning unit according to an embodiment of the invention. The heat pump air conditioning unit comprises a compressor 1, an outer unit heat exchanger 3, a four-way valve 4 and a throttling element 5 (such as an expansion valve); the heat pump air conditioning unit comprises an internal machine heat exchanger 2 and a variable frequency hydraulic module 6 on the water system side, wherein the variable frequency hydraulic module 6 at least comprises a variable frequency water pump. Optionally, as shown in fig. 2, the heat pump air conditioning unit may further include a thermal bulb 21 for detecting an outlet water temperature T1 (specifically, an outlet water temperature of an inner heat exchanger water path) of the inner heat exchanger 2, and a thermal bulb 61 for detecting an inlet water temperature T2 (specifically, an inlet water temperature of a variable frequency hydro module water path, such as an inlet water temperature of a variable frequency water pump water path) of the variable frequency hydro module 6, where the compressor 1 is preferably a variable frequency compressor. The inner machine heat exchanger 2 can be any one of a double-pipe heat exchanger, a plate heat exchanger, a shell-and-tube heat exchanger and a high-efficiency tank. The variable-frequency hydraulic module 6 at least comprises a variable-frequency water pump, and the water flow can be adjusted by adjusting the frequency of the variable-frequency water pump (namely adjusting the rotating speed of a water pump motor). The variable-frequency hydraulic module 6 can further comprise at least one of a valve, a filter, a constant-pressure water replenishing device and a water pump control electric cabinet.
The invention provides an anti-freezing control method for a heat pump air conditioning unit.
Fig. 1 is a schematic method diagram of an embodiment of a method for controlling anti-freezing of a heat pump air conditioning unit according to the invention.
As shown in fig. 1, according to an embodiment of the present invention, the method for controlling freeze prevention of a heat pump air conditioning unit includes at least step S110 and step S120.
And S110, detecting the outlet water temperature of the heat exchanger of the inner machine and the inlet water temperature of the variable-frequency hydraulic module when the heat pump air conditioning unit operates in a refrigerating mode.
For example, referring to fig. 2, the temperature T1 of the outlet water of the inner heat exchanger 2 can be detected by the temperature sensing bulb 21 at the outlet of the waterway of the inner heat exchanger 2, and the temperature T2 of the inlet water of the variable frequency hydro module 6 can be detected by the temperature sensing bulb 61 at the inlet of the waterway of the variable frequency hydro module 6. The frequency conversion hydraulic module 3 at least comprises a frequency conversion water pump, and the water flow can be adjusted by adjusting the frequency of the frequency conversion water pump (namely adjusting the rotating speed of a water pump motor).
And S120, controlling the heat pump air conditioning unit to normally perform refrigeration operation, executing anti-freezing operation control operation or stopping operation according to the detected outlet water temperature of the indoor unit heat exchanger and the inlet water temperature of the variable-frequency hydraulic module.
In a specific embodiment, the normal refrigeration operation, the anti-freezing operation control operation or the stop operation of the heat pump air conditioning unit are controlled according to the detected outlet water temperature of the indoor unit heat exchanger and the inlet water temperature of the variable-frequency hydraulic module, and the method includes the following conditions:
(1) and when the outlet water temperature T1 of the internal machine heat exchanger is detected to be higher than the second anti-freezing junction temperature and the inlet water temperature T2 of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to normally perform refrigeration operation.
For example, when T1 > B and T2 > 0 are detected, the heat pump system operates as normal cooling.
(2) And when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute anti-freezing operation control operation.
The second anti-freezing junction temperature B is greater than the first anti-freezing junction temperature A, namely, A is greater than 0 and less than B. The anti-freeze operation control operation includes: at least one of the first anti-freeze operation control operation, the second anti-freeze operation control operation, and the third anti-freeze control operation.
And when the outlet water temperature of the indoor unit heat exchanger is detected to be higher than the first anti-freezing junction temperature and lower than or equal to the second anti-freezing junction temperature, and the inlet water temperature of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to execute a first anti-freezing operation control operation. In a specific embodiment, the performing the first anti-freeze operation control operation specifically includes: and controlling the running frequency of the compressor to increase a first preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a second preset frequency.
Specifically, when detecting that A is more than T1 and less than or equal to B and T2 is more than 0, executing a first anti-freezing operation control logic, and if the compressor is a variable-frequency compressor, controlling the compressor to reduce frequency mHz (a first preset frequency) and a variable-frequency hydraulic module to increase frequency nHz (a second preset frequency); if the compressor is a fixed-frequency compressor, the variable-frequency hydraulic module is controlled to increase the frequency nHz (the second preset frequency).
Further, after the heat pump air conditioning unit is controlled to execute a first anti-freezing operation control operation, whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero are detected; if the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, the anti-freezing operation control is quitted; and if the outlet water temperature of the indoor unit heat exchanger is detected to be less than the sum of the second anti-freezing junction temperature and the preset temperature, or the inlet water temperature of the variable-frequency hydraulic module is detected to be less than zero, controlling the running frequency of the compressor to increase the first preset frequency again and/or controlling the frequency of the variable-frequency hydraulic module to increase the second preset frequency again until the outlet water temperature of the indoor unit heat exchanger is detected to be more than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be more than zero, and quitting the anti-freezing running control.
Specifically, a first anti-freezing operation control operation is executed, the compressor reduces the frequency of the compressor to a first preset frequency, the variable-frequency hydraulic module increases the frequency of the compressor to a second preset frequency, and after a certain time X seconds (the first preset time), whether T1 is greater than or equal to B + a (a is a preset temperature, for example, 3 ℃) and T2 is greater than 0 is judged, if yes, the first anti-freezing operation control logic is exited, and normal refrigeration operation is performed; if the frequency of the compressor is not satisfied, reducing the frequency of the mHz (if the compressor is the variable frequency compressor), increasing the frequency of the variable frequency hydraulic module to nHz (the second preset frequency) until the conditions that T1 is more than or equal to B + a and T2 is more than 0 are met, and enabling the unit to exit from the first anti-freezing operation control logic and the system to operate normally in a refrigerating mode.
And when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a first anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation. In a specific embodiment, the performing the second anti-freeze operation control operation may specifically include: and controlling the running frequency of the compressor to increase a third preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a fourth preset frequency. The third preset frequency is greater than the first preset frequency, and the fourth preset frequency is greater than the second preset frequency. For example, the third predetermined frequency is twice the first predetermined frequency, and the fourth predetermined frequency is twice the second predetermined frequency.
Specifically, when detecting that 0 is more than T1 and less than or equal to A and T2 is more than 0, executing a second anti-freezing operation control logic, reducing the frequency of the compressor by 2mHz (a third preset frequency), and increasing the frequency of the hydraulic module by 2nHz (a fourth preset frequency).
Further, after controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature, and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; if the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero is detected, the anti-freezing operation control is quit; and if the outlet water temperature of the indoor unit heat exchanger is detected to be less than the sum of the second anti-freezing junction temperature and the preset temperature, or the inlet water temperature of the variable-frequency hydraulic module is detected to be less than zero, controlling the running frequency of the compressor to increase a third preset frequency again and/or controlling the frequency of the variable-frequency hydraulic module to increase a fourth preset frequency until the outlet water temperature of the indoor unit heat exchanger is detected to be more than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and exiting the anti-freezing running control if the inlet water temperature of the variable-frequency hydraulic module is detected to be more than zero.
Specifically, a second anti-freezing operation control logic is executed, the compressor reduces the frequency of the compressor to a third preset frequency), the hydraulic module increases the frequency of the hydraulic module to a fourth preset frequency, and after a certain time of X seconds (a first preset time), whether T1 is greater than or equal to B + a (a is a preset temperature, for example, 3 ℃) and T2 is greater than 0 is judged, if yes, the second anti-freezing operation control logic is exited, and the system is normally operated in a refrigerating mode; if the frequency is not met, the frequency of the compressor is reduced by 2mHz (a third preset frequency), and the frequency of the hydraulic module is increased by 2nHz (a fourth preset frequency) until T1 is more than or equal to B + a and T2 is more than 0; and the unit exits the second anti-freezing operation control logic, and the system operates normally in a refrigerating mode.
And when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, if the heat pump air conditioning unit is in an oil return state, controlling the heat pump air conditioning unit to execute a third freezing prevention operation control operation. In one embodiment, the performing of the third freeze prevention operation control operation may specifically include: and controlling the frequency of the variable-frequency hydraulic module to be increased to a preset highest frequency for operation. And after the heat pump air conditioning unit is controlled to execute the third freezing prevention operation control operation and the oil return is finished, the heat pump air conditioning unit quits the anti-freezing operation control after quitting the oil return state for a second preset time, and the heat pump air conditioning unit is controlled to normally perform the refrigerating operation.
Specifically, when the heat pump air conditioning unit performs refrigeration operation and enters an oil return state, when the detection result shows that T1 is more than 0 and less than or equal to B and T2 is more than 0, the air conditioning system enters a third freezing operation control logic, the frequency of the variable-frequency hydraulic module is increased to the highest frequency for operation until oil return is completed, the air conditioning system exits from the oil return state, after second preset time, the compressor exits from the third freezing operation control logic after resuming the frequency operation before oil return, and the variable-frequency hydraulic module resumes the normal refrigeration operation of the frequency before oil return.
(3) And when the outlet water temperature of the indoor unit heat exchanger is detected to be less than or equal to zero and the inlet water temperature of the variable-frequency hydraulic module is detected to be less than or equal to zero, controlling the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running, and reporting an anti-freezing protection fault.
Specifically, when the outlet water temperature of the indoor unit heat exchanger is detected to be less than or equal to zero, the inlet water temperature of the variable-frequency hydraulic module is detected to be less than or equal to zero, and after the third preset time is maintained, the heat pump air conditioning unit is controlled to stop running and the variable-frequency hydraulic module stops running, and an anti-freezing protection fault is reported. After the heat pump air conditioning unit is controlled to stop and the variable-frequency hydraulic module stops running for a first preset time, detecting whether the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; and if the outlet water temperature of the inner machine heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to start up for operation.
Namely, when the T1 is detected to be less than or equal to 0 or the T2 is detected to be less than or equal to 0, and the state is maintained for T seconds (third preset time), the air conditioning unit is stopped, the variable-frequency hydraulic module stops running, and meanwhile, the freezing prevention protection fault is reported. After a certain time X seconds (first preset time), judging whether T1 is more than or equal to B + (a is a preset temperature, for example 3 ℃) and T2 is more than 0, and if so, normally refrigerating and starting to operate; if the frequency conversion water power module does not meet the requirement, the air conditioning unit maintains the shutdown state, and the frequency conversion water power module maintains the shutdown state.
For clearly explaining the technical solution of the present invention, an execution flow of the anti-freezing control method for a heat pump air conditioning unit according to the present invention is described below with a specific embodiment.
Fig. 3 is a flowchart of an anti-freezing control method for a heat pump air conditioning unit according to an embodiment of the present invention. As shown in fig. 3, when the unit is in refrigeration operation, T1 is the outlet water temperature of the inner heat exchanger 2, and T2 is the inlet water temperature of the variable frequency hydro-module; a is the first anti-freezing junction temperature and B is the first anti-freezing junction temperature, and A is more than 0 and less than B. When A is more than T1 and less than or equal to B, the heat exchanger 2 in the machine set has a freezing risk; when T1 is more than 0 and less than or equal to A, the freezing risk of the heat exchanger in the unit is aggravated; when T1 is less than or equal to 0, the heat exchanger in the machine set may be frozen. The indoor machine heat exchanger is a water-cooled heat exchanger, and is used as an evaporator during refrigeration operation, water is cooled by a refrigerant, and the freezing risk exists when the temperature of a water path side is lower than 0 ℃.
(1) When the detection T1 is larger than B and the detection T2 is larger than 0, the system is in normal refrigeration operation.
(2) When detecting that A is more than T1 and less than or equal to B and T2 is more than 0, executing a first anti-freezing operation control logic, reducing the frequency of the compressor by mHz (a first preset frequency), and increasing the frequency of the variable-frequency hydraulic module by nHz (a second preset frequency); after a certain time X seconds (first preset time), judging whether T1 is more than or equal to B +3 and T2 is more than 0, if so, quitting the first anti-freezing operation control logic, and performing normal refrigeration operation; if the frequency does not meet the requirement, the compressor reduces the frequency of the mHz (first preset frequency), the variable-frequency hydraulic module increases the frequency of the mHz nHz (second preset frequency) until the T1 is more than or equal to B +3 (preset temperature) and the T2 is more than 0, the unit exits from the first anti-freezing operation control logic, and the system operates normally in a refrigerating mode.
(3) When detecting that the frequency is more than 0 and less than or equal to A and T2 is more than 0, executing a second anti-freezing operation control logic, reducing the frequency of the compressor by 2mHz (third preset frequency), and increasing the frequency of the hydraulic module by 2nHz (fourth preset frequency); after a certain time X seconds (first preset time), judging whether T1 is more than or equal to B +3 (preset temperature) and T2 is more than 0, if so, quitting the second anti-freezing operation control logic, and enabling the system to normally perform refrigeration operation; if the frequency is not met, the frequency of the compressor is reduced by 2mHz (a third preset frequency), and the frequency of the hydraulic module is increased by 2nHz (a fourth preset frequency) until T1 is more than or equal to B +3 and T2 is more than 0; and the unit exits the second anti-freezing operation control logic, and the system operates normally in a refrigerating mode.
(4) And when the T1 is detected to be less than or equal to 0 or the T2 is detected to be less than or equal to 0, and the state is maintained for T seconds (third preset time), the air conditioning unit is stopped, the variable-frequency hydraulic module stops running, and meanwhile, the freezing prevention protection fault is reported. After a certain time X seconds (first preset time), judging whether T1 is more than or equal to B +3 (preset temperature) and T2 is more than 0, and if so, normally refrigerating and starting to operate; if the frequency conversion water power module does not meet the requirement, the air conditioning unit maintains the shutdown state, and the frequency conversion water power module maintains the shutdown state.
Fig. 4 is a flowchart of another specific embodiment of the anti-freezing control method for the heat pump air conditioning unit according to the present invention. As shown in fig. 4, the unit is operated in a refrigerating mode, the compressor is a fixed-frequency compressor, T1 is the water outlet temperature of the inner heat exchanger 2, and T2 is the water inlet temperature of the variable-frequency hydraulic module; a is the first anti-freezing junction temperature and B is the first anti-freezing junction temperature, and A is more than 0 and less than B. When A is more than T1 and less than or equal to B, the heat exchanger in the machine set has the risk of freezing; when T1 is more than 0 and less than or equal to A, the freezing risk of the heat exchanger in the unit is aggravated; when T1 is less than or equal to 0, the heat exchanger in the machine set may be frozen. The inner machine heat exchanger 2 is a water-cooled heat exchanger, and is used as an evaporator during refrigeration operation, water is cooled by a refrigerant, and the freezing risk exists when the temperature of a water path side is lower than 0 ℃.
(1) When the detection T1 is larger than B and the detection T2 is larger than 0, the system is in normal refrigeration operation.
(2) When detecting that A is more than T1 and less than or equal to B and T2 is more than 0, executing a first anti-freezing operation control logic, and increasing the frequency of the variable-frequency hydraulic module to nHz (a second preset frequency); after a certain time X seconds (first preset time), judging whether T1 is more than or equal to B +3 and T2 is more than 0, if so, quitting the first anti-freezing operation control logic, and performing normal refrigeration operation; if the temperature does not meet the preset temperature, the frequency conversion hydraulic module raises the frequency nHz (second preset frequency) again until the temperature T1 is more than or equal to B +3 (preset temperature) and T2 is more than 0, the unit exits from the first anti-freezing operation control logic, and the system operates normally in a refrigerating mode.
(3) When the detection result shows that the value is more than 0 and less than or equal to T1 and more than or equal to A and T2 is more than 0, executing a second anti-freezing operation control logic, and increasing the frequency of the variable-frequency hydraulic module by 2nHz (a fourth preset frequency); after a certain time X seconds (first preset time), judging whether T1 is more than or equal to B +3 (preset temperature) and T2 is more than 0, if so, quitting the second anti-freezing operation control logic, and enabling the system to normally perform refrigeration operation; if not, the frequency conversion hydraulic module is subjected to frequency increase by 2nHz (a fourth preset frequency) until T1 is more than or equal to B +3 and T2 is more than 0; and the unit exits the second anti-freezing operation control logic, and the system operates normally in a refrigerating mode.
(4) And when the T1 is detected to be less than or equal to 0 or the T2 is detected to be less than or equal to 0, and the state is maintained for T seconds (third preset time), the air conditioning unit is stopped, the variable-frequency hydraulic module stops running, and meanwhile, the freezing prevention protection fault is reported. After a certain time X seconds (first preset time), judging whether T1 is more than or equal to B +3 (preset temperature) and T2 is more than 0, and if so, normally refrigerating and starting to operate; if the frequency conversion water power module does not meet the requirement, the air conditioning unit maintains the shutdown state, and the frequency conversion water power module maintains the shutdown state.
FIG. 5 shows the anti-freezing control strategy in the oil return state of the heat pump unit according to the present invention. In the long-term operation process of the compressor, in order to ensure that the compressor oil returns to the compressor in time, oil return operation is performed in a specific state, during the oil return operation, the compressor operates according to a certain fixed frequency, the compressor frequency is not restored to the pre-oil-return operation state until the oil return is finished, and the oil return frequency may be higher than the actual operation frequency, as shown in fig. 5, when the heat pump air conditioning unit performs refrigeration operation and enters the oil return state, an anti-freezing control strategy is as follows:
(1) when the detection T1 is larger than B and the detection T2 is larger than 0, the air conditioning system operates normally.
(2) And when the detection result shows that the T1 is more than 0 and less than or equal to B and the T2 is more than 0, the air-conditioning system enters a third prevention freezing operation control logic, the frequency of the variable-frequency hydraulic module is increased to the highest frequency for operation until oil return is finished, the variable-frequency hydraulic module exits from an oil return state, the variable-frequency hydraulic module exits from the third prevention freezing operation control logic after the compressor recovers the frequency operation before oil return after Y seconds, and the variable-frequency hydraulic module recovers the normal refrigeration operation of the frequency before oil return.
(3) And when the T1 is detected to be less than or equal to 0 or the T2 is detected to be less than or equal to 0, and the state is maintained for T seconds (third preset time), the air conditioning unit is stopped, the variable-frequency hydraulic module also stops running, and meanwhile, the freezing prevention protection fault is reported. After a certain time of X seconds, judging whether T1 is more than or equal to B +3 and T2 is more than 0, if so, quitting the anti-freezing operation control, and starting the machine to operate according to normal refrigeration; if not, the unit and the hydraulic module are kept in a shutdown state, but the system cannot be restarted due to anti-freezing protection for a long time, and then professional personnel are required to be found for maintenance.
Fig. 6 is a block diagram illustrating a structure of an anti-freezing control device for a heat pump air conditioning unit according to an embodiment of the present invention. As shown in fig. 6, the freeze control device 100 for a heat pump air conditioning unit includes a detection unit 110 and a control unit 120.
The detection unit 110 is configured to detect an outlet water temperature of the heat exchanger of the internal machine and an inlet water temperature of the variable frequency hydraulic module when the heat pump air conditioning unit operates in a cooling mode.
For example, referring to fig. 2, the temperature T1 of the outlet water of the inner heat exchanger 2 can be detected by the temperature sensing bulb 21 at the outlet of the waterway of the inner heat exchanger 2, and the temperature T2 of the inlet water of the variable frequency hydro module 6 can be detected by the temperature sensing bulb 61 at the inlet of the waterway of the variable frequency hydro module 6. The frequency conversion hydraulic module 3 at least comprises a frequency conversion water pump, and the water flow can be adjusted by adjusting the frequency of the frequency conversion water pump (namely adjusting the rotating speed of a water pump motor).
The control unit 120 is configured to control the heat pump air conditioning unit to perform normal cooling operation, perform anti-freezing operation control operation, or stop operation according to the detected outlet water temperature of the internal machine heat exchanger and the inlet water temperature of the variable-frequency hydraulic module.
In a specific embodiment, the control unit 120 controls the heat pump air conditioning unit to perform normal cooling operation, perform anti-freezing operation control operation, or stop operation according to the detected outlet water temperature of the indoor unit heat exchanger and the inlet water temperature of the variable frequency hydraulic module, including the following situations:
(1) when the detection unit 110 detects that the outlet water temperature T1 of the indoor unit heat exchanger is greater than the second anti-freezing junction temperature and the inlet water temperature T2 of the variable frequency hydraulic module is greater than zero, the control unit 120 controls the heat pump air conditioning unit to normally perform cooling operation.
For example, when T1 > B and T2 > 0 are detected, the heat pump system operates as normal cooling.
(2) When the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is greater than zero and less than or equal to a second anti-freezing junction temperature, and the inlet water temperature of the variable frequency hydraulic module is greater than zero, the control unit 120 controls the heat pump air conditioning unit to execute anti-freezing operation control operation.
The second anti-freezing junction temperature B is greater than the first anti-freezing junction temperature A, namely, A is greater than 0 and less than B. The anti-freeze operation control operation includes: at least one of the first anti-freeze operation control operation, the second anti-freeze operation control operation, and the third anti-freeze control operation.
When the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is greater than the first anti-freezing junction temperature and less than or equal to the second anti-freezing junction temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the control unit 120 controls the heat pump air conditioning unit to execute a first anti-freezing operation control operation. In a specific embodiment, the control unit 120 performs the first anti-freeze operation control operation specifically including: and controlling the running frequency of the compressor to increase a first preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a second preset frequency.
Specifically, when detecting that A is more than T1 and less than or equal to B and T2 is more than 0, executing a first anti-freezing operation control logic, and if the compressor is a variable-frequency compressor, controlling the compressor to reduce frequency mHz (a first preset frequency) and a variable-frequency hydraulic module to increase frequency nHz (a second preset frequency); if the compressor is a fixed-frequency compressor, the variable-frequency hydraulic module is controlled to increase the frequency nHz (the second preset frequency).
Further, the detecting unit 110 is further configured to: after the control unit 120 controls the heat pump air conditioning unit to execute a first anti-freezing operation control operation, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing temperature and a preset temperature, and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; the control unit 120 is further configured to: if the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the anti-freezing operation control is quitted; and if the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is less than the sum of the second anti-freezing junction temperature and the preset temperature or the inlet water temperature of the variable-frequency hydraulic module is less than zero, controlling the running frequency of the compressor to increase the first preset frequency again and/or controlling the frequency of the variable-frequency hydraulic module to increase the second preset frequency until the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is more than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and the inlet water temperature of the variable-frequency hydraulic module is more than zero, and quitting the anti-freezing running control.
Specifically, a first anti-freezing operation control operation is executed, the compressor reduces the frequency of the compressor to a first preset frequency, the variable-frequency hydraulic module increases the frequency of the compressor to a second preset frequency, and after a certain time X seconds (the first preset time), whether T1 is greater than or equal to B + a (a is a preset temperature, for example, 3 ℃) and T2 is greater than 0 is judged, if yes, the first anti-freezing operation control logic is exited, and normal refrigeration operation is performed; if the frequency of the compressor is not satisfied, reducing the frequency of the mHz (if the compressor is the variable frequency compressor), increasing the frequency of the variable frequency hydraulic module to nHz (the second preset frequency) until the conditions that T1 is more than or equal to B + a and T2 is more than 0 are met, and enabling the unit to exit from the first anti-freezing operation control logic and the system to operate normally in a refrigerating mode.
When the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is greater than zero and less than or equal to a first anti-freezing temperature, and the inlet water temperature of the variable frequency hydraulic module is greater than zero, the control unit 120 controls the heat pump air conditioning unit to execute a second anti-freezing operation control operation. In a specific embodiment, the executing, by the control unit 120, the second anti-freeze operation control operation may specifically include: and controlling the running frequency of the compressor to increase a third preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a fourth preset frequency. The third preset frequency is greater than the first preset frequency, and the fourth preset frequency is greater than the second preset frequency. For example, the third predetermined frequency is twice the first predetermined frequency, and the fourth predetermined frequency is twice the second predetermined frequency.
Specifically, when detecting that 0 is more than T1 and less than or equal to A and T2 is more than 0, executing a second anti-freezing operation control logic, reducing the frequency of the compressor by 2mHz (a third preset frequency), and increasing the frequency of the hydraulic module by 2nHz (a fourth preset frequency).
Further, the detecting unit 110 is further configured to: after the control unit 120 controls the heat pump air conditioning unit to execute a second anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature, and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; the control unit 120 is further configured to: if the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the anti-freezing operation control is quitted; if the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is less than the sum of the second anti-freezing junction temperature and the preset temperature, or the inlet water temperature of the variable-frequency hydraulic module is less than zero, the running frequency of the compressor is controlled to increase a third preset frequency again and/or the frequency of the variable-frequency hydraulic module is controlled to increase a fourth preset frequency until the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the anti-freezing running control is quitted.
Specifically, a second anti-freezing operation control logic is executed, the compressor reduces the frequency of the compressor to a third preset frequency), the hydraulic module increases the frequency of the hydraulic module to a fourth preset frequency, and after a certain time of X seconds (a first preset time), whether T1 is greater than or equal to B + a (a is a preset temperature, for example, 3 ℃) and T2 is greater than 0 is judged, if yes, the second anti-freezing operation control logic is exited, and the system is normally operated in a refrigerating mode; if the frequency does not meet the requirement, the frequency of the compressor is reduced by 2mHz (third preset frequency), and the frequency conversion hydraulic module is increased by 2nHz (fourth preset frequency) until T1 is more than or equal to B + a and T2 is more than 0; and the unit exits the second anti-freezing operation control logic, and the system operates normally in a refrigerating mode.
The control unit 120 is further configured to: when the detection unit 110 detects that the outlet water temperature of the internal machine heat exchanger is greater than zero and less than or equal to the second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, if the heat pump air conditioning unit is in an oil return state, the heat pump air conditioning unit is controlled to execute a third freezing prevention operation control operation. In one embodiment, the performing, by the control unit 120, the third freeze prevention operation control operation may specifically include: and controlling the frequency of the variable-frequency hydraulic module to be increased to a preset highest frequency for operation. And after the control unit 120 controls the heat pump air conditioning unit to execute the third freezing prevention operation control operation and after the oil return is finished and the oil return state is quitted for a second preset time, the control unit quits the anti-freezing operation control to control the heat pump air conditioning unit to normally perform the refrigerating operation.
Specifically, when the heat pump air conditioning unit performs refrigeration operation and enters an oil return state, when the detection result shows that T1 is more than 0 and less than or equal to B and T2 is more than 0, the air conditioning system enters a third freezing operation control logic, the frequency of the variable-frequency hydraulic module is increased to the highest frequency for operation until oil return is completed, the air conditioning system exits from the oil return state, after second preset time, the compressor exits from the third freezing operation control logic after resuming the frequency operation before oil return, and the variable-frequency hydraulic module resumes the normal refrigeration operation of the frequency before oil return.
(3) When the detection unit 110 detects that the outlet water temperature of the indoor unit heat exchanger is less than or equal to zero and the inlet water temperature of the variable-frequency hydraulic module is less than or equal to zero, the heat pump air conditioning unit is controlled to stop and the variable-frequency hydraulic module stops running, and an anti-freezing protection fault is reported.
Specifically, when the detection unit 110 detects that the outlet water temperature of the internal machine heat exchanger is less than or equal to zero, and the inlet water temperature of the variable-frequency hydraulic module is less than or equal to zero, and maintains for a third preset time, the control unit 120 controls the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop operating, and reports an anti-freezing protection fault. After the control unit 120 controls the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running for a first preset time, the detection unit 110 detects whether the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero; if the detection unit 110 detects that the outlet water temperature of the internal machine heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the control unit 120 controls the heat pump air conditioning unit to start and operate in a refrigerating mode.
Namely, when the T1 is detected to be less than or equal to 0 or the T2 is detected to be less than or equal to 0, and the state is maintained for T seconds (third preset time), the air conditioning unit is stopped, the variable-frequency hydraulic module stops running, and meanwhile, the freezing prevention protection fault is reported. After a certain time X seconds (first preset time), judging whether T1 is more than or equal to B + (a is a preset temperature, for example 3 ℃) and T2 is more than 0, and if so, normally refrigerating and starting to operate; if the frequency conversion water power module does not meet the requirement, the air conditioning unit maintains the shutdown state, and the frequency conversion water power module maintains the shutdown state.
The invention also provides a storage medium corresponding to the heat pump air conditioning unit and the anti-freezing control method thereof, wherein a computer program is stored on the storage medium, and the computer program is executed by a processor to realize the steps of any one of the methods.
The invention also provides a heat pump air conditioning unit corresponding to the heat pump air conditioning unit and the anti-freezing control method thereof, which comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, wherein the processor realizes the steps of any one of the methods when executing the program.
The invention also provides a heat pump air conditioning unit corresponding to the heat pump air conditioning unit and the anti-freezing control device thereof, which comprises any one of the heat pump air conditioning unit and the anti-freezing control device thereof.
Therefore, according to the scheme provided by the invention, the control of the variable-frequency hydraulic module is increased, and the water temperature can be more quickly and effectively controlled through the combined control of the variable-frequency hydraulic module and the compressor, so that the starting and stopping times of the compressor are more effectively reduced, and the system performance, reliability and user comfort are improved. Meanwhile, the problem that the anti-freezing protection is invalid due to drift or fault of a single temperature sensing bulb can be prevented.
The control of the variable-frequency hydraulic module is increased, compared with the control of a fan, a compressor, a bypass valve and a throttle valve, the influence on the water temperature is quicker and more direct, and the problems that the startup and shutdown operations of the compressor are required when the compressor is prevented from freezing at every time, the startup and shutdown times of the compressor are multiple, and the service lives of the compressor and an air conditioner are shortened are effectively solved. Whether the anti-freezing protection is started or not is judged through the outlet water temperature of the inner machine heat exchanger and the inlet water temperature of the variable-frequency hydraulic module, so that the anti-freezing protection failure caused by drifting or faults of the anti-freezing temperature sensing package can be prevented. In the oil return process of the unit, when the compressor runs according to the oil return frequency, whether the compressor enters anti-freezing protection can be judged, and the machine is prevented from being shut down due to the anti-freezing protection during oil return.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the following claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and the parts serving as the control device may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (12)

1. A control method for preventing the freezing of a heat pump air conditioning unit is characterized by comprising the following steps:
when the heat pump air conditioning unit operates in a refrigerating mode, the outlet water temperature of an inner machine heat exchanger and the inlet water temperature of a variable-frequency hydraulic module are detected;
and controlling the heat pump air conditioning unit to normally perform refrigeration operation, execute anti-freezing operation control operation or stop operation according to the detected outlet water temperature of the heat exchanger of the internal machine and the inlet water temperature of the variable-frequency hydraulic module.
2. The freezing prevention control method according to claim 1, wherein the controlling the heat pump air conditioning unit to normally perform cooling operation, perform freezing prevention operation control operation or stop operation according to the detected outlet water temperature of the indoor unit heat exchanger and the inlet water temperature of the variable frequency hydraulic module comprises:
when the outlet water temperature of the inner machine heat exchanger is detected to be higher than a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to normally perform refrigeration operation;
when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute anti-freezing operation control operation;
and when the outlet water temperature of the indoor unit heat exchanger is detected to be less than or equal to zero and the inlet water temperature of the variable-frequency hydraulic module is detected to be less than or equal to zero, controlling the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running, and reporting an anti-freezing protection fault.
3. The anti-icing control method according to claim 2, characterized in that said anti-icing operation control operation comprises: at least one of the first anti-freeze operation control operation, the second anti-freeze operation control operation, and the third anti-freeze operation control operation;
when the temperature of the outlet water of the indoor unit heat exchanger is detected to be higher than a first anti-freezing junction temperature and lower than or equal to a second anti-freezing junction temperature, and the temperature of the inlet water of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to execute a first anti-freezing operation control operation;
when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a first anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation;
when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, if the heat pump air conditioning unit is in an oil return state, the heat pump air conditioning unit is controlled to execute a third anti-freezing operation control operation;
wherein the second anti-freezing junction temperature is greater than the first anti-freezing junction temperature.
4. The anti-freezing control method according to claim 3,
performing a first anti-freeze operation control operation comprising: controlling the running frequency of a compressor to increase a first preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a second preset frequency;
performing a second anti-freeze operation control operation comprising: controlling the running frequency of the compressor to increase a third preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a fourth preset frequency;
executing a third freeze prevention operation control operation comprising: controlling the frequency of the variable-frequency hydraulic module to rise to a preset highest frequency for operation;
the third preset frequency is greater than the first preset frequency, and the fourth preset frequency is greater than the second preset frequency.
5. The anti-freezing control method according to claim 3 or 4, further comprising:
after controlling the heat pump air conditioning unit to execute a first anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero;
if the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, the anti-freezing operation control is quitted;
if the outlet water temperature of the indoor unit heat exchanger is detected to be less than the sum of the second anti-freezing junction temperature and the preset temperature, or the inlet water temperature of the variable-frequency hydraulic module is detected to be less than zero, the running frequency of the compressor is controlled to be increased by the first preset frequency again, and/or the frequency of the variable-frequency hydraulic module is controlled to be increased by the second preset frequency again until the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, the anti-freezing running control is quitted;
and/or the presence of a gas in the gas,
after controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero;
if the outlet water temperature of the indoor unit heat exchanger is detected to be greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero is detected, the anti-freezing operation control is quit;
if the outlet water temperature of the indoor unit heat exchanger is detected to be less than the sum of the second anti-freezing junction temperature and the preset temperature, or the inlet water temperature of the variable-frequency hydraulic module is detected to be less than zero, the running frequency of the compressor is controlled to be increased by a third preset frequency again, and/or the frequency of the variable-frequency hydraulic module is controlled to be increased by a fourth preset frequency again until the outlet water temperature of the indoor unit heat exchanger is detected to be more than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the anti-freezing running control is quitted if the inlet water temperature of the variable-frequency hydraulic module is detected to be more than zero;
and/or the presence of a gas in the gas,
after the heat pump air conditioning unit is controlled to stop and the variable-frequency hydraulic module stops running for a first preset time, detecting whether the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero;
if the outlet water temperature of the inner machine heat exchanger is detected to be greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to start up for operation;
and/or the presence of a gas in the gas,
and after the heat pump air conditioning unit is controlled to execute the third freezing prevention operation control operation and the oil return is finished, the heat pump air conditioning unit quits the anti-freezing operation control after quitting the oil return state for a second preset time, and the heat pump air conditioning unit is controlled to normally perform the refrigerating operation.
6. The utility model provides a heat pump air conditioning unit prevents frostbite controlling means which characterized in that includes:
the detection unit is used for detecting the outlet water temperature of the heat exchanger of the inner machine and the inlet water temperature of the variable-frequency hydraulic module when the heat pump air conditioning unit operates in a refrigerating mode;
and the control unit is used for controlling the heat pump air conditioning unit to normally perform refrigeration operation, execute anti-freezing operation control operation or stop operation according to the detected outlet water temperature of the inner machine heat exchanger and the inlet water temperature of the variable-frequency hydraulic module.
7. The freezing prevention control device according to claim 6, wherein the control unit controls the heat pump air conditioning unit to perform normal cooling operation, perform freezing prevention operation control operation or stop operation according to the detected outlet water temperature of the indoor unit heat exchanger and the inlet water temperature of the variable frequency hydraulic module, and comprises:
when the outlet water temperature of the inner machine heat exchanger is detected to be higher than a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to normally perform refrigeration operation;
when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute anti-freezing operation control operation;
and when the outlet water temperature of the indoor unit heat exchanger is detected to be less than or equal to zero and the inlet water temperature of the variable-frequency hydraulic module is detected to be less than or equal to zero, controlling the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running, and reporting an anti-freezing protection fault.
8. The anti-icing control arrangement according to claim 7, characterized in that said anti-icing operation control operation comprises: at least one of the first anti-freeze operation control operation, the second anti-freeze operation control operation, and the third anti-freeze control operation;
when the temperature of the outlet water of the indoor unit heat exchanger is detected to be higher than a first anti-freezing junction temperature and lower than or equal to a second anti-freezing junction temperature, and the temperature of the inlet water of the variable-frequency hydraulic module is detected to be higher than zero, controlling the heat pump air conditioning unit to execute a first anti-freezing operation control operation;
when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a first anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, controlling the heat pump air conditioning unit to execute a second anti-freezing operation control operation;
when the outlet water temperature of the indoor unit heat exchanger is detected to be greater than zero and less than or equal to a second anti-freezing junction temperature and the inlet water temperature of the variable-frequency hydraulic module is detected to be greater than zero, if the heat pump air conditioning unit is in an oil return state, the heat pump air conditioning unit is controlled to execute a third anti-freezing operation control operation;
wherein the second anti-freezing junction temperature is greater than the first anti-freezing junction temperature.
9. The anti-freezing control device according to claim 8,
the control unit performs a first anti-freeze operation control operation including: controlling the running frequency of a compressor to increase a first preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a second preset frequency;
the control unit performs a second anti-freeze operation control operation, including: controlling the running frequency of the compressor to increase a third preset frequency and/or controlling the frequency of the variable-frequency hydraulic module to increase a fourth preset frequency;
the control unit executes a third freeze prevention operation control operation including: controlling the frequency of the variable-frequency hydraulic module to rise to a preset highest frequency for operation;
the third preset frequency is greater than the first preset frequency, and the fourth preset frequency is greater than the second preset frequency.
10. The anti-freezing control device according to claim 8 or 9, further comprising:
the detection unit is further configured to: after the control unit controls the heat pump air conditioning unit to execute a first anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero;
the control unit is further configured to: if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the anti-freezing operation control is quitted;
if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is less than the sum of the second anti-freezing junction temperature and the preset temperature or the inlet water temperature of the variable-frequency hydraulic module is less than zero, controlling the running frequency of the compressor to increase the first preset frequency again and/or controlling the frequency of the variable-frequency hydraulic module to increase the second preset frequency until the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, and quitting the anti-freezing running control;
and/or the presence of a gas in the gas,
the detection unit is further configured to: after the control unit controls the heat pump air conditioning unit to execute a second anti-freezing operation control operation for a first preset time, detecting whether the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero;
the control unit is further configured to: if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero, the anti-freezing operation control is quitted;
if the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is less than the sum of the second anti-freezing junction temperature and the preset temperature or the inlet water temperature of the variable-frequency hydraulic module is less than zero, controlling the running frequency of the compressor to increase by a third preset frequency again and/or controlling the frequency of the variable-frequency hydraulic module to increase by a fourth preset frequency until the detection unit detects that the outlet water temperature of the indoor unit heat exchanger is more than or equal to the sum of the second anti-freezing junction temperature and the preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is more than zero, and quitting the anti-freezing running control;
and/or the presence of a gas in the gas,
the detection unit is further configured to: after the control unit controls the heat pump air conditioning unit to stop and the variable-frequency hydraulic module to stop running for a first preset time, detecting whether the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of a second anti-freezing junction temperature and a preset temperature and whether the inlet water temperature of the variable-frequency hydraulic module is greater than zero;
the control unit is further configured to: if the detection unit detects that the outlet water temperature of the inner machine heat exchanger is greater than or equal to the sum of the second anti-freezing junction temperature and the preset temperature, and the inlet water temperature of the variable-frequency hydraulic module is greater than zero, controlling the heat pump air conditioning unit to start up for operation;
and/or the presence of a gas in the gas,
the control unit is further configured to: and after the heat pump air conditioning unit is controlled to execute the third freezing prevention operation control operation and the oil return is finished, the heat pump air conditioning unit quits the anti-freezing operation control after quitting the oil return state for a second preset time, and the heat pump air conditioning unit is controlled to normally perform the refrigerating operation.
11. A storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
12. A heat pump air conditioning unit comprising a processor, a memory, and a computer program stored on the memory and operable on the processor, the processor executing the program to perform the steps of the method of any one of claims 1 to 5 or comprising the freeze control apparatus of the heat pump air conditioning unit of any one of claims 6 to 10.
CN202111488413.5A 2021-12-07 2021-12-07 Heat pump air conditioning unit, anti-freezing control method and device thereof and storage medium Pending CN114151929A (en)

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