CN116105402A - Fin heat exchanger and control method thereof - Google Patents

Fin heat exchanger and control method thereof Download PDF

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Publication number
CN116105402A
CN116105402A CN202310067106.2A CN202310067106A CN116105402A CN 116105402 A CN116105402 A CN 116105402A CN 202310067106 A CN202310067106 A CN 202310067106A CN 116105402 A CN116105402 A CN 116105402A
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China
Prior art keywords
heat exchanger
fin heat
flow divider
refrigerant flow
refrigerant
Prior art date
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Pending
Application number
CN202310067106.2A
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Chinese (zh)
Inventor
刘昕昕
宁明辉
王振
黄曙良
侯志辉
李庆辉
杨伟茂
张晓迪
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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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Application filed by Qingdao Hisense Hitachi Air Conditioning System Co Ltd filed Critical Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority to CN202310067106.2A priority Critical patent/CN116105402A/en
Publication of CN116105402A publication Critical patent/CN116105402A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate 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
    • F24F11/30—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
    • 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
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/02—Subcoolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
    • 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)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The embodiment of the application discloses a fin heat exchanger and a control method thereof, relates to the technical field of air conditioners, and is used for solving the problems of poor heat exchange effect and low defrosting efficiency of a common fin heat exchanger. The fin heat exchanger includes a fin plate; a heat exchange tube stack comprising: the heat exchange tubes are uniformly arranged in the fin plate and are connected with the refrigerant flow divider; the liquid collecting tube group comprises a refrigerant diverter and a plurality of diversion capillaries, each diversion capillary is connected with one or a plurality of heat exchange tubes, and a one-way throttle valve is arranged in series between the diversion capillary at the lower side and the refrigerant diverter; when the fin heat exchanger is in a refrigeration mode, the one-way throttle valve is in a conducting and non-throttling state; or when the fin heat exchanger is in the heating mode, the one-way throttle valve is in a conducting and throttling state.

Description

Fin heat exchanger and control method thereof
Technical Field
The application relates to the technical field of air conditioners, in particular to a fin heat exchanger and a control method thereof.
Background
At present, most air conditioners on the market adopt an additional supercooling section to solve the problem of icing at the bottom of the fin heat exchanger, so that the temperature measurement of air in a flow path close to the supercooling section during heating operation can be improved, and the heat exchange performance is also improved.
At present, by adding the scheme of the supercooling section, the temperature of the air side is obviously improved when a flow path close to the supercooling section heats and runs, and the heat exchange performance is better. However, during the cooling operation, the heat exchange effect of the flow path is not obviously changed, so that the problem that the optimal refrigerant circulation amount required for cooling and heating on the flow path is different occurs. The design of the heating bias performance is generally adopted to solve the problem, which results in the performance degradation of refrigeration.
Disclosure of Invention
The application provides a fin heat exchanger and a control method thereof, which are used for solving the problems of poor heat exchange effect and low defrosting efficiency of a common fin heat exchanger.
In order to achieve the above purpose, the following technical scheme is adopted in the application.
In a first aspect, embodiments of the present application provide a fin heat exchanger, including: a fin plate; a heat exchange tube stack comprising: the heat exchange tubes are uniformly arranged in the fin plate and are connected with the refrigerant flow divider; the liquid collecting tube group comprises a refrigerant diverter and a plurality of diversion capillaries, each diversion capillary is connected with one or a plurality of heat exchange tubes, and a one-way throttle valve is arranged in series between the diversion capillary at the lower side and the refrigerant diverter; when the fin heat exchanger is in a refrigeration mode, the one-way throttle valve is in a conducting and non-throttling state; or when the fin heat exchanger is in the heating mode, the one-way throttle valve is in a conducting and throttling state.
The technical scheme provided by the embodiment of the application at least brings the following beneficial effects: the one-way throttle valve is arranged in series between the split capillary group and the refrigerant splitter to control the on and off of the refrigerant flow, and when the fin heat exchanger operates in a heating mode, the one-way throttle valve is conducted and throttled to ensure that the resistance of the fin heat exchanger is different between the operation refrigerating mode and the heating mode, so that the refrigerant circulation quantity of a flow path close to the supercooling section pipe group in the operation refrigerating mode or the heating mode of the fin heat exchanger is distinguished, and the problem that the refrigerant distribution is not uniform when the fin heat exchanger operates in the refrigerating mode or the heating mode is solved.
In some embodiments, the fin heat exchanger further comprises: the supercooling section tube group comprises one or more heat exchange tubes, and the supercooling section tube group is connected with the one-way valve in parallel through two sections of refrigerant pipelines; the one-way valve is used for controlling the connection and disconnection between the supercooling section tube group and the refrigerant flow divider; when the fin heat exchanger is in a refrigeration mode, the one-way valve is in a closed state; or when the fin heat exchanger is in the heating mode, the one-way valve is in an open state.
In some embodiments, the fin heat exchanger further comprises: the refrigerant flow divider comprises a first refrigerant flow divider and a second refrigerant flow divider, the first refrigerant flow divider and the second refrigerant flow divider are connected in parallel through a refrigerant pipeline, and the first refrigerant flow divider is arranged on the upper side of the second refrigerant flow divider; the first refrigerant flow divider and the second refrigerant flow divider are connected with the electronic expansion valve through a first refrigerant pipeline; the throttling device is used for controlling the on and off of the first refrigerant flow divider; a controller configured to: when the fin heat exchanger is in a heating mode, acquiring outdoor temperature, first condensing temperature and second condensing temperature of the fin heat exchanger and heating time length of the fin heat exchanger in the heating mode; the first condensation temperature is the condensation temperature of the refrigerant in the upper heat exchange tube of the fin heat exchanger, and the second condensation temperature is the condensation temperature of the refrigerant in the lower heat exchange tube of the fin heat exchanger; when the heating time is greater than or equal to a first time threshold value and the second condensing temperature is greater than or equal to the first temperature threshold value, controlling the fin heat exchanger to enter a reverse defrosting mode, wherein in the reverse defrosting mode, controlling an electronic expansion valve in the fin heat exchanger to be opened and controlling a throttling device to be opened.
In some embodiments, the controller is further configured to: and when the first condensation temperature is greater than or equal to the second temperature threshold value, controlling the throttling device of the fin heat exchanger to be closed.
In some embodiments, the controller is further configured to: acquiring reverse defrosting time length of the fin heat exchanger in a reverse defrosting mode; and when the reverse defrosting time is greater than or equal to a second time threshold value and/or the second condensing temperature is greater than a second temperature threshold value, controlling the fin heat exchanger to enter a heating mode, opening a one-way valve of the fin heat exchanger and/or opening a throttling device of the fin heat exchanger.
In a second aspect, an embodiment of the present application provides a control method for a fin heat exchanger, where a refrigerant diverter of the fin heat exchanger includes a first refrigerant diverter and a second refrigerant diverter, and the first refrigerant diverter is located on an upper side of the second refrigerant diverter; the fin heat exchanger also comprises a throttling device for controlling the on and off of the first refrigerant flow divider and an electronic expansion valve connected with the second refrigerant flow divider through a first refrigerant pipeline; the fin heat exchanger is arranged in an outdoor unit of an air conditioning system, and the method comprises the following steps: when the air conditioning system operates in a heating mode, acquiring an outdoor temperature, a first condensing temperature and a second condensing temperature of the fin heat exchanger and heating time length of the air conditioning system in the heating mode; the first condensation temperature is the condensation temperature of the refrigerant in the upper heat exchange tube of the fin heat exchanger, and the second condensation temperature is the condensation temperature of the refrigerant in the lower heat exchange tube of the fin heat exchanger; when the heating time is greater than or equal to a first time threshold value and the second condensing temperature is greater than or equal to a first temperature threshold value, controlling the air conditioning system to enter a reverse defrosting mode, wherein in the reverse defrosting mode, controlling an electronic expansion valve in the fin heat exchanger to be opened and controlling the throttling device to be opened.
In a third aspect, embodiments of the present application provide a controller, including: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program code comprising computer instructions that, when executed by the one or more processors, cause the controller to perform any of the methods of controlling a fin heat exchanger provided in the second aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium comprising computer instructions which, when run on a computer, cause the computer to perform the method provided in the second aspect and in a possible implementation.
In a fifth aspect, embodiments of the present invention provide a computer program product directly loadable into a memory and comprising software code, the computer program product being capable of performing the method as provided in the second aspect and in a possible implementation after being loaded and executed via a computer.
It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer readable storage medium may be packaged together with the processor of the controller or may be packaged separately from the processor of the controller, which is not limited in this application.
The beneficial effects described in the second to fifth aspects of the present application may refer to the beneficial effect analysis of the first aspect, and are not described here in detail.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate and do not limit the invention.
Fig. 1 is a schematic block diagram of a fin heat exchanger according to an embodiment of the present application;
fig. 2 is a hardware configuration block diagram of a fin heat exchanger provided in an embodiment of the present application;
FIG. 3 is a schematic block diagram of another fin heat exchanger provided in an embodiment of the present application;
FIG. 4 is a schematic block diagram of another fin heat exchanger provided in an embodiment of the present application;
FIG. 5 is a schematic block diagram of another fin heat exchanger provided in an embodiment of the present application;
fig. 6 is a flowchart of a control method of a fin heat exchanger provided in an embodiment of the present application;
FIG. 7 is a flowchart of a control method of another fin heat exchanger according to an embodiment of the present disclosure;
FIG. 8 is a schematic block diagram of another fin heat exchanger provided in an embodiment of the present application;
fig. 9 is a schematic hardware structure of a controller according to an embodiment of the present application.
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.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
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 stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.
In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
As described above in the background art, the heat exchange effect of the general fin heat exchanger is poor, and the defrosting efficiency is low, so that the bottom of the fin heat exchanger is extremely easy to freeze when the air conditioning system is running, resulting in poor performance of the fin heat exchanger and unclean defrosting.
Based on this, the embodiment of the application provides a fin heat exchanger and a control method thereof, which are used for controlling the connection or disconnection of all components by adding hardware such as a supercooling section, a one-way valve, a throttle valve, a refrigerant flow divider and the like to the fin heat exchanger, so that the defrosting efficiency of the fin heat exchanger is realized and the running performance of the fin heat exchanger is improved.
For further description of aspects of the present application, the following detailed description is given of the drawings of the present application.
Fig. 1 is a schematic structural diagram of a fin heat exchanger according to an embodiment of the present application. As shown in fig. 1, the fin heat exchanger 100 includes a heat exchange tube group 101, a liquid collection tube group 102, a flow dividing capillary tube 103, a refrigerant flow divider 104, a one-way throttle valve 105, and a controller 1000 (not shown in fig. 1).
The heat exchange tube group 101 includes a plurality of heat exchange tubes, the plurality of heat exchange tubes are uniformly arranged in the fin plate, and the plurality of heat exchange tubes are connected with the refrigerant flow divider 104.
The liquid collecting tube group 102 comprises a refrigerant diverter 104 and a plurality of diversion capillaries 103, each diversion capillary is connected with one or a plurality of heat exchange tubes, and a one-way throttle valve 105 is arranged in series between the diversion capillary at the lower side and the refrigerant diverter.
The refrigerant diverter 104 is used for uniformly distributing the inflowing refrigerant.
A one-way throttle valve 105 for changing a throttle section or a throttle length to control a flow rate of the refrigerant. The refrigerant flow divider is arranged between the flow dividing capillary group and the refrigerant flow divider in series. The heat exchanger is conducted when the fin heat exchanger is in a refrigerating mode, and is conducted and throttled when the fin heat exchanger is in a heating mode, so that the refrigerant distribution of the fin heat exchanger is uniform and unified when the fin heat exchanger runs in the heating mode or the refrigerating mode.
In the embodiment shown in the present application, the controller 1000 refers to a device that can generate an operation control signal according to an instruction operation code and a timing signal, and instruct an air conditioning system to execute a control instruction. By way of example, the controller 1000 may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The controller 1000 may also be any other device having a processing function, such as a circuit, a device, or a software module, which is not limited in any way by the embodiments of the present application.
Further, the controller 1000 may be used to control the components inside the fin heat exchanger 100 such that the respective components operate to achieve respective predetermined functions of the fin heat exchanger 100.
Fig. 2 is a block diagram illustrating a hardware configuration of an air conditioning system according to an exemplary embodiment of the present application. As shown in fig. 2, the fin heat exchanger 100 may further include two of: memory 1002 and communication interface 1003.
Memory 1002 may be used to store software programs and data. The controller 1000 performs various functions and data processing of the fin heat exchanger 100 by running software programs or data stored in the memory 1002. The memory 1002 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. The memory 1002 stores an operating system that enables the fin heat exchanger 100 to operate. The memory 1002 in the present application may store an operating system and various application programs, and may also store codes for executing the control method of the air conditioning system provided in the embodiments of the present application.
In some embodiments, the communication interface 1003 is used to establish a communication connection with other network entities, for example with a terminal device. The communication interface 1003 may include a Radio Frequency (RF) module, a cellular module, a wireless fidelity (wireless fidelity, WIFI) module, a GPS module, and the like. Taking an RF module as an example, the RF module may be used for receiving and transmitting signals, in particular, transmitting received information to the controller 1000 for processing; in addition, the signal generated by the controller 1000 is transmitted. Typically, the RF circuitry may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (low noise amplifier, LNA), a duplexer, and the like.
Those skilled in the art will appreciate that the hardware configuration shown in fig. 2 is not limiting of the present air conditioning system and that the fin heat exchanger may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
In some embodiments, when the optimal refrigerant circulation amount required by the flow path close to the supercooling section pipe group in the fin heat exchanger operation refrigeration mode and the heating mode is different, a one-way throttle valve is added in the flow path close to the supercooling section pipe group, and the one-way throttle valve is controlled to realize the conduction or throttling of the refrigerant circulation amount. Fig. 3 is a schematic structural diagram of another fin heat exchanger according to an embodiment of the present disclosure.
Illustratively, when the fin heat exchanger is in the cooling mode, the one-way throttle valve is in a conductive and non-throttled state. Or when the fin heat exchanger is in the heating mode, the one-way throttle valve is in a conducting and throttling state.
According to the scheme provided by the embodiment, the difference of the resistances of the fin heat exchanger in the operation refrigeration mode and the heating mode can be ensured, so that the difference of the refrigerant circulation quantity of the flow path close to the supercooling section pipe group in the operation refrigeration mode or the heating mode of the fin heat exchanger is realized, and the problem that the refrigerant distribution is not uniform when the fin heat exchanger operates in the refrigeration mode or the heating mode is solved.
In some embodiments, adding a stack of super cooling sections to the fin heat exchanger results in a loss of some of the heat-producing properties of the fin heat exchanger, thereby increasing the pressure loss of the fin heat exchanger components. To this problem, this application has added the check valve in parallel on the subcooling section nest of tubes, realizes switching on or blocking of refrigerant flow through controlling this check valve. Fig. 4 is a schematic structural diagram of another fin heat exchanger according to an embodiment of the present disclosure.
Illustratively, the check valve is in a closed state when the fin heat exchanger is in the cooling mode. Or when the fin heat exchanger is in the heating mode, the one-way valve is in an open state.
According to the scheme provided by the embodiment, the one-way throttle valve is arranged in series between the split capillary group and the refrigerant splitter to control the on and off of the refrigerant flow, when the fin heat exchanger operates in a heating mode, the one-way throttle valve is conducted and throttled to ensure that the resistance of the fin heat exchanger is different in the operation cooling mode and the heating mode, so that the refrigerant circulation quantity of a flow path close to the supercooling section pipe group in the operation cooling mode or the heating mode of the fin heat exchanger is distinguished, and the problem that the refrigerant distribution is not uniform when the fin heat exchanger operates in the cooling mode or the heating mode is solved.
In some embodiments, the fin heat exchanger has longer reverse defrosting time, and for the problem, the application adds a refrigerant flow divider, an electronic expansion valve and a throttling device in the fin heat exchanger, and controls the on and off of the flow divider through the electronic expansion valve and the throttling device. Fig. 5 is a schematic structural diagram of another fin heat exchanger according to an embodiment of the present disclosure.
Optionally, the refrigerant diverter comprises a first refrigerant diverter and a second refrigerant diverter, the first refrigerant diverter and the second refrigerant diverter are connected in parallel through a refrigerant pipeline, and the first refrigerant diverter is arranged on the upper side of the second refrigerant diverter; the first refrigerant flow divider and the second refrigerant flow divider are connected with the electronic expansion valve through a first refrigerant pipeline.
The throttling device is used for controlling the on and off of the first refrigerant flow divider.
Fig. 6 is a flowchart of a control method of a fin heat exchanger according to an embodiment of the present application. As shown in fig. 6, the method comprises the steps of:
s101, when the fin heat exchanger operates in a heating mode, acquiring outdoor temperature, first condensing temperature and second condensing temperature of the fin heat exchanger and heating duration of the fin heat exchanger in the heating mode.
The first condensation temperature is the condensation temperature of the refrigerant in the upper heat exchange tube of the fin heat exchanger, and the second condensation temperature is the condensation temperature of the refrigerant in the lower heat exchange tube of the fin heat exchanger.
In a specific implementation, the outdoor temperature is T a Te for first condensing temperature of fin heat exchanger 1 To represent. Te for second condensing temperature of fin heat exchanger 2 To represent. The heating duration of the fin heat exchanger in the heating mode is denoted by t.
S102, controlling the fin heat exchanger to enter a reverse defrosting mode under the condition that the heating time is greater than or equal to a first time threshold and the second condensing temperature is less than or equal to a first temperature threshold.
In the reverse defrosting mode, an electronic expansion valve in the fin heat exchanger is opened, and a throttling device is opened.
In a specific implementation, the first time threshold is used to indicate a heating time of a continuous operation heating mode of the fin heat exchanger, and t is used to 1 And (3) representing. The first temperature threshold is a preset temperature value, T is used 1 To represent.
In some embodiments, when t is greater than or equal to t when the fin heat exchanger is operating in the heating mode 1 And Te is 2 ≤T 1 And when the four-way valve is switched, the controller controls the fin heat exchanger to enter a reverse defrosting mode. At this time, the throttle device is opened, and the electronic expansion valve is opened.
Optionally, the fin heat exchanger enters a reverse defrost mode, i.e. the fin heat exchanger enters a refrigeration mode.
In some embodiments, the throttle device of the fin heat exchanger is controlled to be closed when the first condensing temperature is greater than or equal to the second temperature threshold.
Wherein the second temperature threshold is a preset temperature value, and is greater than the first temperature threshold by T 2 To represent.
Exemplary, when Te 1 ＞T 2 And when defrosting on the upper side of the fin heat exchanger is finished, the throttling device is closed, and the electronic expansion valve is kept open.
Further, when Te 2 ＞T 2 And when the integral defrosting of the fin heat exchanger is finished, the throttling device is started at the moment, and the controller controls the fin heat exchanger to operate in a heating mode.
In some embodiments, obtaining a reverse defrost duration of a fin heat exchanger operating in a reverse defrost mode; and when the reverse defrosting time is greater than or equal to a second time threshold value and/or the second condensing temperature is greater than a second temperature threshold value, controlling the fin heat exchanger to enter a heating mode, opening a one-way valve of the fin heat exchanger and/or opening a throttling device of the fin heat exchanger.
The second duration threshold is used for indicating a preset reverse defrosting duration.
Exemplary, when Te 2 ≥T 2 Or when the time of the fin heat exchanger entering the reverse defrosting mode is longer than the preset reverse defrosting time, the controller directly controls the fin heat exchanger to finish the reverse defrosting mode operation and switch to the heating mode operation. At this time, the throttle device of the fin heat exchanger is opened.
Optionally, the throttling device may be an electromagnetic valve or an electronic expansion valve, and the working principle and the control method of the throttling device are consistent with those of the throttling device, which are not described herein.
Alternatively, the above steps may be implemented by a flowchart as shown in fig. 7. As shown in fig. 7.
S1, operating a heating mode of the fin heat exchanger.
S2, when t is greater than or equal to t 1 And Te is 2 ≤T 1 And when the four-way valve is switched, the controller controls the fin heat exchanger to enter a reverse defrosting mode. The throttle device is opened, and the electronic expansion valve is opened. If t is less than t 1 Or t is greater than or equal to t 1 But Te is 2 ＞T 1 S1 is performed.
S3, when Te 2 ＞T 2 Or when the time for the fin heat exchanger to enter the reverse defrosting mode is greater than the preset defrosting time, executing the following step S4. Otherwise, judging Te 1 ＞T 2 If the defrosting of the upper side of the fin heat exchanger is finished, the throttling device is closed, and the electronic expansion valve is kept open. If not, executing the step S2.
S4, when Te 2 ＞T 2 And when the integral defrosting of the fin heat exchanger is finished, the throttling device is started, and the fin heat exchanger operates in a heating mode. Otherwise, the above step S3 is executed.
The technical scheme provided by the embodiment of the application at least brings the following beneficial effects: the refrigerant flow divider is added in the fin heat exchanger, the throttling device is added on the upper side of the first refrigerant flow divider, and then the opening and closing of the refrigerant flow path on the upper side of the fin heat exchanger are judged according to the first condensation temperature and the second condensation temperature on the upper side of the fin heat exchanger, so that more refrigerant flow is distributed for reverse defrosting operation on the lower side of the fin heat exchanger, and the purposes of improving reverse defrosting efficiency and shortening reverse defrosting time are achieved.
In some embodiments, a fin heat exchanger without the addition of a bottom stack of super cooling sections is also provided in embodiments of the present application. Fig. 8 is a schematic structural view of a fin heat exchanger without adding a bottom super cooling section tube group according to an embodiment of the present application.
Optionally, in the embodiment of the application, the reasonable distribution of the refrigerant flow is realized through the conduction or the closing of the one-way throttle valve or the one-way valve.
Illustratively, when a one-way throttle valve is added to the fin heat exchanger without the addition of the bottom subcooling section tube group, the one-way throttle valve is turned on when the fin heat exchanger is operating in the refrigeration mode and is closed when the fin heat exchanger is operating in the heating mode. When a one-way valve is added in the fin heat exchanger without adding the bottom subcooling section tube group, the one-way valve is turned on when the fin heat exchanger is in a cooling mode of operation and is closed when the fin heat exchanger is in a heating mode of operation.
The fin heat exchanger without adding the bottom supercooling section tube group can reduce power loss of the bottom supercooling section tube group during operation, improve the refrigerating performance of the fin heat exchanger, and meanwhile, the one-way throttle valve or the one-way valve is added on the split capillary tube group of the flow path at the lower side of the fin heat exchanger, so that the refrigerant flow distribution of the fin heat exchanger during the operation refrigerating mode or the heating mode is distinguished. Therefore, the superheat degree of the fin heat exchanger in the operation heating mode is guaranteed, so that the bottom of the fin heat exchanger is prevented from icing, and the uniformity of a refrigerant flow path of the fin heat exchanger in the operation cooling mode is also guaranteed. Meanwhile, when the fin heat exchanger performs a reverse defrosting mode, rapid defrosting of the lower side of the fin heat exchanger is realized, and high defrosting efficiency is improved.
The embodiment of the application also provides an air conditioning system, which comprises an outdoor unit and one or more indoor units, wherein the outdoor unit comprises the fin heat exchanger provided in the embodiment.
The embodiment of the present application further provides a schematic hardware structure of a controller, as shown in fig. 9, where the controller 1000 includes a processor 1001, and optionally, the controller 1000 further includes a memory 1002 and a communication interface 1003 connected to the processor 1001. The processor 1001, the memory 1002, and the communication interface 1003 are connected by a bus 1004.
The processor 1001 may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The processor 1001 may also be any other means having processing functionality, such as a circuit, device or software module. The processor 1001 may also include a plurality of CPUs, and the processor 1001 may be one single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).
The memory 1002 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that may store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, as the embodiments of the present application are not limited in this regard. The memory 1002 may be implemented separately or integrated with the processor 1001. Wherein the memory 1002 may contain computer program code. The processor 1001 is configured to execute computer program codes stored in the memory 1002, thereby implementing the control method provided in the embodiment of the present application.
Communication interface 1003 may be used to communicate with other devices or communication networks (e.g., ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc.). The communication interface 1003 may be a module, circuit, transceiver, or any device capable of communicating.
Bus 1004 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The bus 1004 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 9, but not only one bus or one type of bus.
Embodiments of the present invention also provide a computer-readable storage medium including computer-executable instructions that, when executed on a computer, cause the computer to perform a method as provided in the above embodiments.
The embodiment of the present invention also provides a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product can implement the method provided by the above embodiment after being loaded and executed by a computer.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely exemplary, and for example, the division of modules or units is merely a logical function division, and other manners of division may be implemented in practice. For example, multiple units or components may be combined or may be integrated into another device, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and the parts shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A fin heat exchanger, comprising:
a fin plate;
a heat exchange tube stack comprising: the heat exchange tubes are uniformly arranged in the fin plate and are connected with the refrigerant flow divider;
the liquid collecting tube group comprises the refrigerant flow divider and a plurality of flow dividing capillaries, each flow dividing capillary is connected with one or a plurality of heat exchange tubes, and a one-way throttle valve is arranged between the flow dividing capillary at the lower side and the refrigerant flow divider in series;
when the fin heat exchanger is in a refrigeration mode, the one-way throttle valve is in a conducting and non-throttling state; or,
when the fin heat exchanger is in a heating mode, the one-way throttle valve is in a conducting and throttling state.
2. The fin heat exchanger of claim 1, further comprising:
the supercooling section tube group comprises one or more heat exchange tubes, and the supercooling section tube group is connected with the one-way valve in parallel through two sections of refrigerant pipelines; the one-way valve is used for controlling the connection and disconnection between the supercooling section tube group and the refrigerant flow divider;
wherein,,
when the fin heat exchanger is in a refrigeration mode, the one-way valve is in a closed state; or,
when the fin heat exchanger is in a heating mode, the one-way valve is in an open state.
3. The fin heat exchanger of claim 1 or 2, wherein the fin heat exchanger further comprises:
the refrigerant flow divider comprises a first refrigerant flow divider and a second refrigerant flow divider, the first refrigerant flow divider and the second refrigerant flow divider are connected in parallel through a refrigerant pipeline, and the first refrigerant flow divider is arranged on the upper side of the second refrigerant flow divider;
the first refrigerant flow divider and the second refrigerant flow divider are connected with the electronic expansion valve through a first refrigerant pipeline;
the throttling device is used for controlling the on and off of the first refrigerant flow divider;
a controller configured to:
when the fin heat exchanger is in a heating mode, acquiring outdoor temperature, first condensing temperature and second condensing temperature of the fin heat exchanger and heating duration of the fin heat exchanger in the heating mode; the first condensation temperature is the condensation temperature of the refrigerant in the upper heat exchange tube of the fin heat exchanger, and the second condensation temperature is the condensation temperature of the refrigerant in the lower heat exchange tube of the fin heat exchanger;
and when the heating time is greater than or equal to a first time threshold, and the second condensing temperature is greater than or equal to a first temperature threshold, controlling the fin heat exchanger to enter a reverse defrosting mode, wherein in the reverse defrosting mode, controlling an electronic expansion valve in the fin heat exchanger to be opened and controlling a throttling device to be opened.
4. A fin heat exchanger according to claim 3, wherein the throttle means comprises a solenoid valve or an electronic expansion valve.
5. The fin heat exchanger of claim 3, wherein the controller is further configured to:
and when the first condensation temperature is greater than or equal to a second temperature threshold value, controlling a throttling device of the fin heat exchanger to be closed.
6. The fin heat exchanger of claim 5, wherein the controller is further configured to:
acquiring reverse defrosting time length of the fin heat exchanger in the reverse defrosting mode;
and when the reverse defrosting time is greater than or equal to a second time threshold value and/or the second condensing temperature is greater than a second temperature threshold value, controlling the fin heat exchanger to enter a heating mode, and/or opening a one-way valve of the fin heat exchanger and/or opening a throttling device of the fin heat exchanger.
7. The control method of the fin heat exchanger is characterized in that a refrigerant flow divider of the fin heat exchanger comprises a first refrigerant flow divider and a second refrigerant flow divider, and the first refrigerant flow divider is positioned on the upper side of the second refrigerant flow divider; the fin heat exchanger further comprises a throttling device for controlling the on and off of the first refrigerant flow divider and an electronic expansion valve connected with the second refrigerant flow divider through a first refrigerant pipeline;
the fin heat exchanger is arranged in an outdoor unit of an air conditioning system, and the method comprises the following steps:
when the air conditioning system operates in a heating mode, acquiring an outdoor temperature, a first condensing temperature and a second condensing temperature of the fin heat exchanger and heating duration of the air conditioning system in the heating mode; the first condensation temperature is the condensation temperature of the refrigerant in the upper heat exchange tube of the fin heat exchanger, and the second condensation temperature is the condensation temperature of the refrigerant in the lower heat exchange tube of the fin heat exchanger;
and when the heating time is greater than or equal to a first time threshold, and the second condensing temperature is greater than or equal to a first temperature threshold, controlling the air conditioning system to enter a reverse defrosting mode, wherein in the reverse defrosting mode, controlling an electronic expansion valve in the fin heat exchanger to be opened and controlling a throttling device to be opened.
8. The method of claim 7, wherein the method further comprises:
and when the first condensation temperature is greater than or equal to a second temperature threshold value, controlling a throttling device of the fin heat exchanger to be closed.
9. The method of claim 8, wherein the method further comprises:
acquiring reverse defrosting time of the air conditioning system in the reverse defrosting mode;
and when the reverse defrosting time is greater than or equal to a second time threshold value and/or the second condensing temperature is greater than a second temperature threshold value, controlling the air conditioning system to enter a heating mode, and/or opening a one-way valve of the fin heat exchanger and/or opening a throttling device of the fin heat exchanger.
10. An air conditioning system comprising an outdoor unit and one or more indoor units, the outdoor unit comprising the fin heat exchanger of any one of claims 1 to 6.
CN202310067106.2A 2023-01-11 2023-01-11 Fin heat exchanger and control method thereof Pending CN116105402A (en)

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