CN114440401B - Air source heat pump unit - Google Patents

Air source heat pump unit Download PDF

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Publication number
CN114440401B
CN114440401B CN202210207150.4A CN202210207150A CN114440401B CN 114440401 B CN114440401 B CN 114440401B CN 202210207150 A CN202210207150 A CN 202210207150A CN 114440401 B CN114440401 B CN 114440401B
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China
Prior art keywords
circulation system
refrigerant circulation
defrosting
control
interlocking
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CN202210207150.4A
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Chinese (zh)
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CN114440401A (en
Inventor
禹志强
丛辉
刘敬坤
吕振鹏
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202210207150.4A priority Critical patent/CN114440401B/en
Publication of CN114440401A publication Critical patent/CN114440401A/en
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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
    • F24F11/42—Defrosting; Preventing freezing of outdoor 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
    • F24F11/50—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
    • F24F11/62—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
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to an air source heat pump unit, which comprises a first refrigerant circulation system and a second refrigerant circulation system, wherein the first refrigerant circulation system comprises a first outdoor heat exchanger, the second refrigerant circulation system comprises a second outdoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger share an outdoor fan, a control module is configured to judge whether the other refrigerant circulation system meets an interlocking defrosting condition when receiving a defrosting signal of any refrigerant circulation system, perform interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system meets the interlocking defrosting condition, and perform time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system does not meet the interlocking defrosting condition. The invention adopts a control mode of combining double-system interlocking defrosting and time-sharing defrosting, optimizes the defrosting process, can furthest reconcile the two systems to synchronously perform heating and defrosting, reduces the defrosting times and improves the heating effect.

Description

Air source heat pump unit
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to an air source heat pump unit.
Background
When the air source heat pump unit heats and runs in winter, the fin heat exchanger can frost, and the more the frost is formed, the larger the unit heating capacity attenuation is. Therefore, the unit needs to be defrosted when frosting is carried out to a certain extent so as to maintain the heating capacity and energy efficiency of the unit. When defrosting, the refrigerating system stops heating, and the fan also stops running.
For the air source heat pump unit with double systems and common fans, the heating operation states of the two systems are not completely consistent, so that frosting amounts are different, and when one system needs to defrost, the other system may need to defrost, or may not need to defrost. However, when any one system is defrosting, all the outdoor fans will stop running, because the two system fans are shared, and thus the other system which does not need defrosting cannot continue heating. Therefore, the heating quantity, the heating efficiency and the air conditioning comfort of the unit are greatly affected during defrosting.
At present, the industry generally adopts an alternate defrosting control mode, namely one system stops heating operation when entering defrosting, and enters a waiting state, so that the two systems alternately defrost. The control mode has the defects that the two systems are subjected to frequent alternate defrosting, the heating quantity is greatly attenuated, the water temperature is frequently fluctuated, and the efficiency and the comfort of the air conditioning system are influenced. And because the two systems are always asynchronous, the frosting conditions are inconsistent in most cases, and the whole unit is basically defrosted alternately in the heating process.
Therefore, optimizing the defrosting control mode of the air source heat pump unit with the double-system common fan is very important to improving the heating effect of the unit.
Disclosure of Invention
The invention provides an air source heat pump unit, which solves the technical problems of frequent defrosting, large heating attenuation, low heating efficiency and water temperature fluctuation caused by respective defrosting of each system of a double-system common-air-source air source heat pump unit of the existing air source heat pump unit.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the air source heat pump unit comprises a first refrigerant circulation system and a second refrigerant circulation system, wherein the first refrigerant circulation system comprises a first outdoor heat exchanger, the second refrigerant circulation system comprises a second outdoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger share an outdoor fan, the unit comprises a control module, the control module is configured to judge whether the other refrigerant circulation system meets an interlocking defrosting condition when receiving a defrosting signal of any refrigerant circulation system, perform interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system meets the interlocking defrosting condition, and perform time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system does not meet the interlocking defrosting condition.
In some embodiments, the interlocked defrost condition is: the temperature Te_ slv of the outdoor heat exchanger of the other refrigerant circulation system is less than or equal to k, ta-b and Te_ slv is less than or equal to 0, wherein Ta is the outdoor environment temperature, and k and b are coefficients determined in advance.
In some embodiments, the interlocked defrost condition further comprises: the other refrigerant circulation system continuously heats and runs for a first set time t1.
In some embodiments, the interlocked defrost condition further comprises: the heating water inlet temperature Ti of the unit is more than or equal to the set temperature.
In some embodiments, the control module is configured to switch to defrost control when the first refrigerant circulation system and the second refrigerant circulation system perform interlocking defrost control, and switch to heating operation after defrosting of the first refrigerant circulation system and the second refrigerant circulation system is completed.
In some embodiments, the control module is configured to switch the first refrigerant circulation system and the second refrigerant circulation system to defrost control when the first refrigerant circulation system and the second refrigerant circulation system perform interlocking defrost control, switch the first refrigerant circulation system and the second refrigerant circulation system to post-defrost control after the first refrigerant circulation system finishes defrost, switch the second refrigerant circulation system to heating operation when the second refrigerant circulation system finishes defrost and switch the second refrigerant circulation system to post-defrost control after the second refrigerant circulation system finishes defrost.
In some embodiments, the control module is configured to switch the refrigerant circulation system that sends the defrosting signal to the defrosting control when the first refrigerant circulation system and the second refrigerant circulation system perform time-sharing defrosting control; and the other system stops heating operation, and after defrosting is finished, the first refrigerant circulation system and the second refrigerant circulation system are switched into heating operation.
In some embodiments, the control module is configured to switch the refrigerant circulation system that sends the defrosting signal to defrosting control when the first refrigerant circulation system and the second refrigerant circulation system perform time-sharing defrosting control, and to switch the refrigerant circulation system to pressure difference control after defrosting is finished; and after the other system stops heating operation, performing pressure difference control, and when the interlocking defrosting end condition is met, switching the first refrigerant circulation system and the second refrigerant circulation system into heating operation.
In some embodiments, the end condition of the interlocking defrosting is that the pressure difference control is performed after the first refrigerant circulation system and the second refrigerant circulation system enter and the second set time t2 is continued, and/or the high-low pressure difference of the two systems is less than or equal to Pset.
In some embodiments, the post-pressure differential control is compressor shutdown; or, the operation frequency of the compressor is adjusted so that the high-low pressure difference of the refrigerant circulation system is within a set pressure difference range.
Compared with the prior art, the technical scheme of the invention has the following technical effects: the air source heat pump unit comprises a first refrigerant circulation system and a second refrigerant circulation system, wherein the first refrigerant circulation system comprises a first outdoor heat exchanger, the second refrigerant circulation system comprises a second outdoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger share an outdoor fan, a control module is configured to judge whether the other refrigerant circulation system meets an interlocking defrosting condition when receiving a defrosting signal of any refrigerant circulation system, perform interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system meets the interlocking defrosting condition, and perform time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system does not meet the interlocking defrosting condition. The invention comprehensively judges the frosting states of the two systems, adopts a control mode of combining double-system interlocking defrosting and time-sharing defrosting, optimizes the defrosting process and improves the heating effect of the unit. The interlocking defrosting control provided by the invention can furthest reconcile the synchronous heating and defrosting of the two systems, reduce the defrosting times and improve the heating effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an air source heat pump unit according to an embodiment of the present invention.
Fig. 2 is a refrigerant cycle diagram of an air source heat pump unit according to an embodiment of the present invention.
Fig. 3 is a functional block diagram of an embodiment of the present invention.
Fig. 4 is a schematic block diagram of an air source heat pump unit according to an embodiment of the present invention.
Fig. 5 is a schematic block diagram of an air source heat pump unit according to an embodiment of the present invention.
FIG. 6 is a flow chart of an embodiment of the present invention.
FIG. 7 is a flow chart of an embodiment of the present invention.
Fig. 8 is a flow chart of an embodiment of the present invention.
Fig. 9 is a flow chart of an embodiment of the present invention.
Fig. 10 is a flow chart of an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The air conditioner performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, a throttling device, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion device expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and the restriction device may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
As shown in fig. 1-2, the air source heat pump unit is a dual-system co-blower air source heat pump unit.
The air source heat pump unit comprises a first refrigerant circulation system and a second refrigerant circulation system.
As shown in fig. 2, the first refrigerant circulation system includes a first compressor 11, a first four-way valve 12, a first outdoor heat exchanger 13, a first throttle device 14, a first water side heat exchanger, and a first gas-liquid separator 15, which are sequentially connected through pipes.
The second refrigerant circulation system comprises a second compressor 21, a second four-way valve 22, a second outdoor heat exchanger 23, a second throttling device 24, a second water side heat exchanger and a second gas-liquid separator 25 which are sequentially connected through pipelines.
In the figure, the first water side heat exchanger and the second water side heat exchanger are integrated as a water side heat exchanger 2, the water side heat exchanger 2 having a water inlet and a water outlet to provide cold/hot water to the outside.
The first refrigerant circulation system and the second refrigerant circulation system independently operate.
The first outdoor heat exchanger 13 of the first refrigerant circulation system and the second outdoor heat exchanger 23 of the second refrigerant circulation system share the outdoor fan 3.
As shown in fig. 1, the first outdoor heat exchanger 13 of the first refrigerant circulation system and the second outdoor heat exchanger 23 of the second refrigerant circulation system together form a V-shaped combination, and the first outdoor heat exchanger 13 and the second outdoor heat exchanger 23 share the outdoor fan 3. The first refrigerant circulation system and the second refrigerant circulation system respectively belong to two independent refrigeration systems. Besides sharing the outdoor fan 3, the first refrigerant circulation system and the second refrigerant circulation system are mutually independent and do not interfere with each other when in heating operation. Since the respective operation states and operation times of the first refrigerant circulation system and the second refrigerant circulation system are different, the first outdoor heat exchanger 13 of the first refrigerant circulation system and the second outdoor heat exchanger 23 of the second refrigerant circulation system may have a difference in frosting amount at the time of heating operation.
Specifically, when the first refrigerant circulation system works, the outdoor fan 3 works, when the second refrigerant circulation system works, the outdoor fan 3 works, and when both the first refrigerant circulation system and the second refrigerant circulation system work, the outdoor fan 3 works.
The heating operation states of the first refrigerant cycle and the second refrigerant cycle are not completely identical, and therefore, the frosting amounts of the first outdoor heat exchanger 13 and the second outdoor heat exchanger 23 are different, and when one system needs to be defrosted, the other system may need to be defrosted or may not need to be defrosted. However, when any one system is defrosting, all the outdoor fans 3 will stop running, because the two system fans are common, and thus the other system that does not need defrosting will not continue to heat. According to the scheme, the interlocking defrosting conditions are set on the basis of the existing defrosting conditions, the frosting conditions of the first refrigerant circulation system and the second refrigerant circulation system are comprehensively judged, the interlocking defrosting or time-sharing defrosting control is intelligently selected, and when one system is defrosted, the other system is defrosted synchronously, and the defrosting effect is achieved without frosting or mistakes. Meanwhile, through intelligent control, the two systems tend to synchronously heat and defrost, so that the alternation of the two systems is reduced as much as possible, and the heating attenuation and water temperature fluctuation caused by defrosting are reduced.
The intelligent defrosting control combining the interlocking defrosting and the time-sharing defrosting is carried out on the air source heat pump unit. In the heating operation process of the air source heat pump unit, the double-system interlocking defrosting control or the time-sharing defrosting control is automatically judged and executed according to the state difference of the outdoor heat exchangers of the first refrigerant circulation system and the second refrigerant circulation system.
Specifically, the unit comprises a control module, the control module is configured to judge whether the other refrigerant circulation system meets the interlocking defrosting condition when receiving a defrosting signal of any refrigerant circulation system, perform interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system meets the interlocking defrosting condition, and perform time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system when the other refrigerant circulation system does not meet the interlocking defrosting condition.
When the control module receives a defrosting signal of the first refrigerant circulation system, judging whether the second refrigerant circulation system meets an interlocking defrosting condition, and when the second refrigerant circulation system meets the interlocking defrosting condition, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; and when the second refrigerant circulation system does not meet the interlocking defrosting condition, performing time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, defrosting the first refrigerant circulation system and the second refrigerant circulation system at different time, and defrosting the first refrigerant circulation system, wherein the second refrigerant circulation system does not defrost, and defrosting is performed until the second refrigerant circulation system needs to defrost.
When the control module receives a defrosting signal of the second refrigerant circulation system, judging whether the first refrigerant circulation system meets an interlocking defrosting condition, and when the first refrigerant circulation system meets the interlocking defrosting condition, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; when the first refrigerant circulation system does not meet the interlocking defrosting condition, time-sharing defrosting control is performed on the first refrigerant circulation system and the second refrigerant circulation system, namely, the first refrigerant circulation system and the second refrigerant circulation system do not defrost at the same time, the second refrigerant circulation system is defrosted, the first refrigerant circulation system does not defrost, and defrosting is performed until the first refrigerant circulation system needs defrosting.
In some embodiments, the interlocked defrost condition is: the outdoor heat exchanger temperature Te_ slv of the other refrigerant circulation system (refrigerant circulation system without defrosting signal) is less than or equal to k, ta-b and Te_ slv is less than or equal to 0, wherein Ta is the outdoor environment temperature, and k and b are coefficients determined in advance.
As shown in fig. 3, the air source heat pump unit includes an outdoor heat exchanger temperature detection module for detecting an outdoor heat exchanger temperature te_ slv, and an outdoor ambient temperature detection module for detecting an outdoor ambient temperature Ta.
When the control module receives a defrosting signal of the first refrigerant circulation system, judging whether the second refrigerant circulation system meets an interlocking defrosting condition, and when the second refrigerant circulation system meets the temperature Te_ slv which is less than or equal to k which is less than or equal to Ta-b and Te_ slv which is less than or equal to 0 of the second outdoor heat exchanger, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; and when the second refrigerant circulation system does not meet the temperature Te_ slv of the second outdoor heat exchanger which is less than or equal to k, ta-b and Te_ slv is less than or equal to 0, performing time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, defrosting the first refrigerant circulation system without simultaneously defrosting the first refrigerant circulation system, and defrosting the second refrigerant circulation system without defrosting until the second refrigerant circulation system needs to be defrosted.
When the control module receives a defrosting signal of the second refrigerant circulation system, judging whether the first refrigerant circulation system meets an interlocking defrosting condition, and when the first refrigerant circulation system meets the temperature Te_ slv which is less than or equal to k which is less than or equal to Ta-b and Te_ slv which is less than or equal to 0 of the first outdoor heat exchanger, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; and when the first refrigerant circulation system does not meet the temperature Te_ slv of the first outdoor heat exchanger which is less than or equal to k, ta-b and Te_ slv is less than or equal to 0, performing time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, defrosting the first refrigerant circulation system and the second refrigerant circulation system at different time, and defrosting the second refrigerant circulation system, wherein the first refrigerant circulation system does not defrost, and defrosting is performed until the first refrigerant circulation system needs to defrost.
In some embodiments, the interlocked defrost condition further comprises: the other refrigerant circulation system continuously heats and runs for a first set time t1.
As shown in fig. 4, the air source heat pump unit further includes a timer for detecting the continuous heating operation time of the refrigerant circulation system.
When the control module receives a defrosting signal of the first refrigerant circulation system, judging whether the second refrigerant circulation system meets an interlocking defrosting condition, and when the second refrigerant circulation system meets the temperature Te_ slv which is less than or equal to k which is less than or equal to Ta-b and Te_ slv which is less than or equal to 0 and the second refrigerant circulation system continuously heats and operates for a first set time t1, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; and when the second refrigerant circulation system does not meet the temperature Te_ slv of the second outdoor heat exchanger which is less than or equal to k, is less than or equal to Ta-b and Te_ slv is less than or equal to 0, or the continuous heating operation of the second refrigerant circulation system does not meet the first set time t1, performing time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, defrosting the first refrigerant circulation system and the second refrigerant circulation system at different time, performing defrosting on the first refrigerant circulation system, performing defrosting on the second refrigerant circulation system, and performing defrosting again when the second refrigerant circulation system needs defrosting.
When the control module receives a defrosting signal of the second refrigerant circulation system, judging whether the first refrigerant circulation system meets an interlocking defrosting condition, and when the first refrigerant circulation system meets the temperature Te_ slv which is less than or equal to k which is less than or equal to Ta-b and Te_ slv which is less than or equal to 0 and the first refrigerant circulation system continuously heats and operates for a first set time t1, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; when the first refrigerant circulation system does not meet the first outdoor heat exchanger temperature Te_ slv which is less than or equal to k which is less than or equal to Ta-b and Te_ slv which is less than or equal to 0 or the continuous heating operation of the first refrigerant circulation system does not meet the first set time t1, time-sharing defrosting control is performed on the first refrigerant circulation system and the second refrigerant circulation system, namely, the first refrigerant circulation system and the second refrigerant circulation system do not defrost at the same time, the second refrigerant circulation system is defrosted, the first refrigerant circulation system does not defrost, and defrosting is performed until the first refrigerant circulation system needs defrosting.
In some embodiments, the interlocked defrost condition further comprises: the heating water inlet temperature Ti of the unit is more than or equal to the set temperature.
As shown in fig. 5, the air source heat pump unit further includes a water inlet temperature detection module, configured to detect a heating water inlet temperature Ti of the unit.
When the control module receives a defrosting signal of the first refrigerant circulation system, judging whether the second refrigerant circulation system meets an interlocking defrosting condition, and when the second refrigerant circulation system meets the conditions that the temperature Te_ slv of the second outdoor heat exchanger is less than or equal to k, ta-b and Te_ slv are less than or equal to 0, the second refrigerant circulation system continuously heats and runs for a first set time t1, and the heating water temperature Ti of the unit is more than or equal to the set temperature, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; and when the second refrigerant circulation system does not meet the temperature Te_ slv of the second outdoor heat exchanger which is less than or equal to k, ta-b and Te_ slv is less than or equal to 0, or the continuous heating operation of the second refrigerant circulation system does not meet the first set time t1, or the heating water inlet temperature of the unit does not meet the temperature Ti which is more than or equal to the set temperature, performing time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, defrosting the first refrigerant circulation system and the second refrigerant circulation system at different times, performing defrosting on the first refrigerant circulation system, performing defrosting on the second refrigerant circulation system, and performing defrosting again when the second refrigerant circulation system needs defrosting.
When the control module receives a defrosting signal of the second refrigerant circulation system, judging whether the first refrigerant circulation system meets an interlocking defrosting condition, and when the first refrigerant circulation system meets the conditions that the temperature Te_ slv of the first outdoor heat exchanger is less than or equal to k, ta-b and Te_ slv are less than or equal to 0, the first refrigerant circulation system continuously heats and runs for a first set time t1, and the heating water temperature Ti of the unit is more than or equal to the set temperature, performing interlocking defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, simultaneously defrosting the first refrigerant circulation system and the second refrigerant circulation system; and when the first refrigerant circulation system does not meet the temperature Te_ slv of the first outdoor heat exchanger which is less than or equal to k, is less than or equal to Ta-b and Te_ slv is less than or equal to 0, or the continuous heating operation of the first refrigerant circulation system does not meet the first set time t1 or the heating water inlet temperature of the unit does not meet the temperature Ti which is more than or equal to the set temperature, performing time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system, namely, defrosting the first refrigerant circulation system and the second refrigerant circulation system at the same time, performing defrosting on the second refrigerant circulation system, performing defrosting on the first refrigerant circulation system, and performing defrosting again when the first refrigerant circulation system needs defrosting.
As shown in fig. 6, the control method of the air source heat pump unit is as follows:
s1, starting.
S2, receiving a defrosting signal of the first refrigerant circulation system or the second refrigerant circulation system.
S3, judging whether the other refrigerant circulation system meets the interlocking defrosting condition, if so, entering a step S4, otherwise, entering a step S5.
S4, the first refrigerant circulation system and the second refrigerant circulation system perform interlocking defrosting control.
S5, performing time-sharing defrosting control on the first refrigerant circulation system and the second refrigerant circulation system.
In some embodiments, the control module is configured to switch the first refrigerant circulation system and the second refrigerant circulation system to defrost when the first refrigerant circulation system and the second refrigerant circulation system perform the interlocking defrost control, and switch to the heating operation after the first refrigerant circulation system and the second refrigerant circulation system are defrosted.
As shown in fig. 7, the chain defrosting control method is as follows:
s1, interlocking defrosting control, and entering steps S2 and S4.
S2, the first refrigerant circulation system is switched into defrosting control.
S3, whether the defrosting of the first refrigerant circulation system is finished or not, if yes, entering a step S6, otherwise, entering the step S3.
S4, the second refrigerant circulation system is switched into defrosting control.
S5, whether the defrosting of the second refrigerant circulation system is finished or not, if yes, entering a step S6, otherwise, entering the step S5.
S6, defrosting of the first refrigerant circulation system and the second refrigerant circulation system is finished.
S7, the first refrigerant system and the second refrigerant system are switched into heating operation.
In some embodiments, the control module is configured to switch the first refrigerant circulation system and the second refrigerant circulation system to defrost when the first refrigerant circulation system and the second refrigerant circulation system perform the interlocking defrost control, switch the first refrigerant circulation system and the second refrigerant circulation system to defrost after the first refrigerant circulation system finishes defrost, switch the first refrigerant circulation system and the second refrigerant circulation system to heating operation when the second refrigerant circulation system finishes defrost and switch the second refrigerant circulation system to the post-pressure difference control after the second refrigerant circulation system finishes defrost and the interlocking defrost termination condition is satisfied.
As shown in fig. 8, the chain defrosting control method is as follows:
s1, interlocking defrosting control, and entering steps S2 and S5.
S2, the first refrigerant circulation system is switched into defrosting control.
S3, whether the defrosting of the first refrigerant circulation system is finished or not, if yes, entering a step S4, otherwise, entering the step S3.
S4, differential pressure control is performed after the first refrigerant circulation system enters. Step S8 is entered.
S5, the second refrigerant circulation system is switched into defrosting control.
S6, whether the defrosting of the second refrigerant circulation system is finished or not, if yes, entering a step S7, otherwise, entering a step S6.
S7, controlling the pressure difference after the first refrigerant circulation system enters. Step S8 is entered.
And S8, judging whether the interlocking defrosting end condition is met, if yes, entering a step S9, otherwise, entering the step S8.
S9, the first refrigerant system and the second refrigerant system are switched into heating operation.
In some embodiments, the control module is configured to switch the refrigerant circulation system that sends the defrosting signal to the defrosting control when the first refrigerant circulation system and the second refrigerant circulation system perform the time-sharing defrosting control; and the other system stops heating operation, and after defrosting is finished, the first refrigerant circulation system and the second refrigerant circulation system are switched into heating operation.
As shown in fig. 9, the time-sharing defrosting control method is as follows:
s1, time-sharing defrosting control is carried out, and the steps S2 and S5 are carried out.
S2, the first refrigerant circulation system meets the defrosting condition, and the second refrigerant system does not meet the interlocking defrosting condition.
S3, the first refrigerant circulation system is switched into defrosting control, and the second refrigerant system stops heating operation.
S4, whether the defrosting of the first refrigerant circulation system is finished or not, if yes, entering a step S8, otherwise, entering the step S4.
S5, the second refrigerant circulation system meets the defrosting condition, and the first refrigerant system does not meet the interlocking defrosting condition.
S6, the second refrigerant circulation system is switched into defrosting control, and the first refrigerant system stops heating operation.
S7, whether the defrosting of the second refrigerant circulation system is finished or not, if yes, the step S8 is carried out, and if not, the step S7 is carried out.
S8, the first refrigerant system and the second refrigerant system are switched into heating operation.
In some embodiments, the control module is configured to switch the refrigerant circulation system that sends the defrosting signal to defrosting control when the first refrigerant circulation system and the second refrigerant circulation system perform time-sharing defrosting control, and to switch the refrigerant circulation system to pressure difference control after entering after defrosting is finished; and after the other system stops heating operation, performing pressure difference control, and when the interlocking defrosting end condition is met, switching the first refrigerant circulation system and the second refrigerant circulation system into heating operation.
As shown in fig. 10, the time-sharing defrosting control method is as follows:
s1, time-sharing defrosting control is carried out, and the steps S2 and S6 are carried out.
S2, the first refrigerant circulation system meets the defrosting condition, and the second refrigerant system does not meet the interlocking defrosting condition.
S3, the first refrigerant circulation system is switched into defrosting control, and the second refrigerant system is controlled by pressure difference after entering.
S4, whether the defrosting of the first refrigerant circulation system is finished or not, if yes, entering a step S5, otherwise, entering the step S4.
S5, controlling the pressure difference after the first refrigerant circulation system enters. Step S10 is entered.
S6, the second refrigerant circulation system meets the defrosting condition, and the first refrigerant system does not meet the interlocking defrosting condition.
S7, the second refrigerant circulation system is switched into defrosting control, and the pressure difference is controlled after the first refrigerant circulation system enters.
S8, whether the defrosting of the second refrigerant circulation system is finished or not, if yes, the step S9 is carried out, and if not, the step S8 is carried out.
S9, controlling the pressure difference after the second refrigerant circulation system enters. Step S10 is entered.
And S10, judging whether an interlocking defrosting end condition is met, if yes, proceeding to the step S11, otherwise, proceeding to the step S10.
S11, the first refrigerant system and the second refrigerant system are switched into heating operation.
And the end condition of the interlocking defrosting is that the pressure difference control is carried out after the first refrigerant circulation system and the second refrigerant circulation system enter, the second set time t2 is continued, and/or the high-low pressure difference of each system is less than or equal to Pset.
Wherein, the back pressure difference control is that the compressor stops running; or, the operation frequency of the compressor is adjusted so that the high-low pressure difference of the refrigerant circulation system is within a set pressure difference range.
The control parameters can be flexibly set according to different units so as to achieve the optimal intelligent defrosting effect.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (7)

1. The air source heat pump unit comprises a first refrigerant circulation system and a second refrigerant circulation system, wherein the first refrigerant circulation system comprises a first outdoor heat exchanger, the second refrigerant circulation system comprises a second outdoor heat exchanger, and the first outdoor heat exchanger and the second outdoor heat exchanger share an outdoor fan;
the interlocking defrosting conditions are as follows: the temperature Te_ slv of an outdoor heat exchanger of the other refrigerant circulating system is less than or equal to k, ta-b and Te_ slv is less than or equal to 0, wherein Ta is the outdoor environment temperature, and k and b are coefficients determined in advance;
the control module is configured to switch the first refrigerant circulation system and the second refrigerant circulation system into defrosting control when the first refrigerant circulation system and the second refrigerant circulation system perform interlocking defrosting control, and switch the first refrigerant circulation system and the second refrigerant circulation system into heating operation after defrosting of the first refrigerant circulation system and the second refrigerant circulation system is finished;
the control module is configured to switch the refrigerant circulation system which sends out the defrosting signal into defrosting control when the first refrigerant circulation system and the second refrigerant circulation system perform time-sharing defrosting control; and the other system stops heating operation, and after defrosting is finished, the first refrigerant circulation system and the second refrigerant circulation system are switched into heating operation.
2. The air source heat pump assembly of claim 1, wherein the interlocked defrost condition further comprises: the other refrigerant circulation system continuously heats and runs for a first set time t1.
3. An air source heat pump unit according to claim 1 or 2, wherein the interlocked defrost condition further comprises: the heating water inlet temperature Ti of the unit is more than or equal to the set temperature.
4. The air source heat pump unit according to claim 1, wherein the control module is configured to switch the first refrigerant circulation system and the second refrigerant circulation system to defrost control when the first refrigerant circulation system and the second refrigerant circulation system perform the interlocking defrost control, switch the first refrigerant circulation system and the second refrigerant circulation system to post-defrost control after the first refrigerant circulation system finishes defrosting, switch the second refrigerant circulation system to heating operation when the interlocking defrost termination condition is satisfied.
5. The air-source heat pump unit according to claim 1, wherein the control module is configured to switch the refrigerant circulation system that sends out the defrosting signal to defrosting control when the first refrigerant circulation system and the second refrigerant circulation system perform time-sharing defrosting control, and to switch to post-pressure difference control after defrosting is completed; and after the other system stops heating operation, performing pressure difference control, and when the interlocking defrosting end condition is met, switching the first refrigerant circulation system and the second refrigerant circulation system into heating operation.
6. The air source heat pump unit according to claim 4 or 5, wherein the end condition of the interlocked defrosting is that the pressure difference control is performed after the first refrigerant circulation system and the second refrigerant circulation system enter and the second set time t2 is continued and/or the high-low pressure difference of the two systems is not more than Pset.
7. An air source heat pump unit according to claim 4 or 5, wherein the post pressure difference control is compressor shutdown; or, the operation frequency of the compressor is adjusted so that the high-low pressure difference of the refrigerant circulation system is within a set pressure difference range.
CN202210207150.4A 2022-03-04 2022-03-04 Air source heat pump unit Active CN114440401B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57117738A (en) * 1981-01-16 1982-07-22 Hitachi Ltd Air-cooled heat pump type air conditioner
JP2002195734A (en) * 2000-12-25 2002-07-10 Matsushita Refrig Co Ltd Refrigerator-freezer
JP2004176967A (en) * 2002-11-26 2004-06-24 Daikin Ind Ltd Refrigerating unit and defrosting method of refrigerating unit
JP2010060183A (en) * 2008-09-02 2010-03-18 Daikin Ind Ltd Air conditioner
CN104634032A (en) * 2015-01-30 2015-05-20 广东美的制冷设备有限公司 Defrosting speed adjusting method, defrosting speed adjusting device and air conditioner
CN111397237A (en) * 2020-02-26 2020-07-10 浙江中广电器股份有限公司 Air conditioner and control mode for realizing defrosting during heating
CN112444001A (en) * 2020-11-30 2021-03-05 青岛海信日立空调系统有限公司 Air conditioner
CN113757857A (en) * 2021-09-30 2021-12-07 广东欧亚制冷设备制造有限公司 Heat pump system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57117738A (en) * 1981-01-16 1982-07-22 Hitachi Ltd Air-cooled heat pump type air conditioner
JP2002195734A (en) * 2000-12-25 2002-07-10 Matsushita Refrig Co Ltd Refrigerator-freezer
JP2004176967A (en) * 2002-11-26 2004-06-24 Daikin Ind Ltd Refrigerating unit and defrosting method of refrigerating unit
JP2010060183A (en) * 2008-09-02 2010-03-18 Daikin Ind Ltd Air conditioner
CN104634032A (en) * 2015-01-30 2015-05-20 广东美的制冷设备有限公司 Defrosting speed adjusting method, defrosting speed adjusting device and air conditioner
CN111397237A (en) * 2020-02-26 2020-07-10 浙江中广电器股份有限公司 Air conditioner and control mode for realizing defrosting during heating
CN112444001A (en) * 2020-11-30 2021-03-05 青岛海信日立空调系统有限公司 Air conditioner
CN113757857A (en) * 2021-09-30 2021-12-07 广东欧亚制冷设备制造有限公司 Heat pump system

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