CN114110833A - Air conditioning unit and control method thereof - Google Patents

Air conditioning unit and control method thereof Download PDF

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Publication number
CN114110833A
CN114110833A CN202010878442.1A CN202010878442A CN114110833A CN 114110833 A CN114110833 A CN 114110833A CN 202010878442 A CN202010878442 A CN 202010878442A CN 114110833 A CN114110833 A CN 114110833A
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CN
China
Prior art keywords
valve
water
outlet
heat exchanger
heat exchange
Prior art date
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Granted
Application number
CN202010878442.1A
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Chinese (zh)
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CN114110833B (en
Inventor
李银银
宋强
任滔
刘江彬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Application filed by Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioning Electric Co Ltd
Priority to CN202010878442.1A priority Critical patent/CN114110833B/en
Priority to PCT/CN2021/092650 priority patent/WO2021228018A1/en
Publication of CN114110833A publication Critical patent/CN114110833A/en
Application granted granted Critical
Publication of CN114110833B publication Critical patent/CN114110833B/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
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Mathematical Physics (AREA)
  • Fuzzy Systems (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention belongs to the technical field of heat pump application, and particularly relates to an air conditioning unit and a control method thereof. The invention aims to solve the problem that the heating efficiency and energy conservation cannot be both considered because the structure of a water-cooling heat exchanger in the existing air conditioning unit is fixed. For the purpose, the conversion between the series structure and the parallel structure of the water-cooling heat exchanger is adjusted, when the outlet water temperature of the water-cooling heat exchanger is higher, the water-cooling heat exchanger is set to be closed when a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve are closed, a plurality of heat exchange units are connected in series at the moment, and the heat exchange performance of the water-cooling heat exchanger is ensured through a longer refrigerant channel and a longer water flow channel; when the water outlet temperature of the water-cooled heat exchanger is lower, the water-cooled heat exchanger is set to be opened when the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened, and at the moment, the plurality of heat exchange units are connected in parallel, so that the energy is saved while the flow rate of water is increased.

Description

Air conditioning unit and control method thereof
Technical Field
The invention belongs to the technical field of heat pump application, and particularly relates to an air conditioning unit and a control method thereof.
Background
In a commercial air conditioning unit, a compressor drives a refrigerant to circulate among an air-cooled heat exchanger, an electronic expansion valve and a water-cooled heat exchanger, a refrigerant channel and a water flow channel which exchange heat with each other are arranged in the water-cooled heat exchanger, and the water flow channel is communicated with an indoor heat exchanger through a water circulation pipeline. When the refrigerant at the exhaust port of the compressor passes through the water-cooling heat exchanger and then passes through the air-cooling heat exchanger, the refrigerant channel of the water-cooling heat exchanger releases heat to heat water flow in the water flow channel, the heat is transferred to the indoor heat exchanger through the water circulation pipeline to realize heating of indoor air, and at the moment, the air-cooling heat exchanger absorbs the heat in the outdoor air.
In the heating process of the air conditioning unit, the heat exchange amount of the refrigerant and water flow in unit time generally needs to be within a certain optimal range so as to ensure the heat exchange efficiency of the water-cooled heat exchanger. According to the formula, Q ═ cm (T)2-T1) Wherein Q is the heat exchange amount in unit time, c is the specific heat capacity of water, m is the mass (or water flow) of water participating in heat exchange in unit time, and T2For the inlet water temperature of the cold heat exchanger, T1The temperature of the inlet water of the water-cooled heat exchanger. Assuming that the heat exchange amount in unit time is kept unchanged, under the condition that the inlet water temperature of the water-cooled heat exchanger is constant, and in order to realize higher outlet water temperature of the water-cooled heat exchanger, smaller water flow is needed to realize sufficient heat exchange; when the temperature of the outlet water is lower, the sufficient heat exchange can be realized only by the larger water flow, and under the condition that the structure of the water-cooling heat exchanger is not changed, the flow speed of the water needs to be increased by increasing the power of the water pump.
However, the existing air conditioning unit has the problem that the structure of the water cooling unit is fixed in the working process, so that the heating efficiency and the energy saving cannot be both considered.
Accordingly, there is a need in the art for a new air conditioning unit and a method of controlling the same to address the above-mentioned problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problem that the heating efficiency and energy saving cannot be both considered due to the fact that the structure of a water cooling unit is fixed in the working process of the existing air conditioning unit, the invention provides an air conditioning unit and a control method thereof.
Firstly, the invention provides an air conditioning unit, wherein a compressor, an air-cooled heat exchanger, an electronic expansion valve and a water-cooled heat exchanger are arranged on a refrigerant circulating pipeline of the air conditioning unit; the water-cooled heat exchanger comprises a plurality of heat exchange units, and each heat exchange unit comprises a refrigerant channel and a water flow channel which exchange heat with each other; the second end of the refrigerant channel of one heat exchange unit in the plurality of heat exchange units is connected with the first end of the refrigerant channel of the next heat exchange unit through a first series pipeline; the first ends of the refrigerant channels of the heat exchange units are connected to the first end of the first shunt pipe, and the second ends of the refrigerant channels of the heat exchange units are connected to the first end of the first collecting pipe; a first on-off valve is arranged between the first end of the refrigerant channel which is simultaneously connected with the first shunt pipe and the first series pipeline and the first shunt pipe, and a second on-off valve is also arranged between the second end of the refrigerant channel which is simultaneously connected with the first collecting pipe and the first series pipeline and the first collecting pipe; a second series pipeline is arranged between the second end of the water flow channel of one heat exchange unit in the plurality of heat exchange units and the first end of the water flow channel of the next heat exchange unit; the first ends of the water flow channels of the heat exchange units are connected to the first end of the second shunt pipe, and the second ends of the water flow channels of the heat exchange units are connected to the first end of the second collecting pipe; a third breaking valve is arranged between the first end of the water flow channel which is simultaneously connected with the second shunt pipe and the second series pipeline and the second shunt pipe, and a fourth breaking valve is also arranged between the second end of the water flow channel which is simultaneously connected with the second collecting pipe and the second series pipeline and the second collecting pipe; and the control unit in the air conditioning unit is set to selectively open or close the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve simultaneously according to the target outlet water temperature of the water flow channel.
As a preferable technical solution of the air conditioning unit provided by the present invention, the air conditioning unit further includes a first three-way valve, a second three-way valve, a first check valve, a second check valve, a third check valve, and a fourth check valve; the compressor is a two-stage compressor, the two-stage compressor is provided with a low-pressure cavity and a high-pressure cavity, and the two-stage compressor is provided with a low-pressure inlet and a low-pressure outlet which are communicated with the low-pressure cavity, and a high-pressure inlet and a high-pressure outlet which are communicated with the high-pressure cavity; the refrigerant circulating pipeline of the air conditioning unit comprises a refrigerating circulating pipeline and a heating circulating pipeline; the first end of the first three-way valve is communicated with a high-pressure outlet of the two-stage compressor, and the first end of the second three-way valve is communicated with a low-pressure inlet of the two-stage compressor; in the refrigeration cycle pipeline, a second end of the first three-way valve is communicated with a first end of the air-cooled heat exchanger, a second end of the air-cooled heat exchanger is communicated with an inlet end of the first one-way valve, an outlet end of the first one-way valve is communicated with an inlet end of the electronic expansion valve, an outlet end of the electronic expansion valve is communicated with an inlet end of the second one-way valve, an outlet end of the second one-way valve is communicated with a flow dividing pipe of the water-cooled heat exchanger, and a collecting pipe of the water-cooled heat exchanger is communicated with a second end of the second three-way valve; in the heating circulation pipeline, a third end of the first three-way valve is communicated with a first collecting pipe of the water-cooling heat exchanger, a shunt pipe of the water-cooling heat exchanger is communicated with an inlet end of a third one-way valve, an outlet end of the third one-way valve is communicated with an inlet end of the electronic expansion valve, an outlet end of the electronic expansion valve is communicated with an inlet end of a fourth one-way valve, an outlet end of the fourth one-way valve is communicated with a second end of the air-cooling heat exchanger, and a first shunt pipe of the air-cooling heat exchanger is communicated with a third end of the second three-way valve; the control unit in the air conditioning unit is also configured to selectively conduct one of the refrigeration cycle line and the heating cycle line according to the demand for cooling or heating.
As a preferable technical solution of the air conditioning unit provided by the present invention, the air conditioning unit further includes an intercooler; the inlet end of the intercooler is communicated with the low-pressure outlet of the two-stage compressor, and the outlet end of the intercooler is communicated with the high-pressure inlet of the two-stage compressor.
As a preferable technical solution of the air conditioning unit provided by the present invention, the air conditioning unit further includes a third three-way valve; a first end of the third three-way valve is communicated with a low-pressure outlet of the two-stage compressor; a second end of the third three-way valve is communicated with an outlet end of the intercooler and a high-pressure inlet of the two-stage compressor; the third end of the third three-way valve is communicated with the inlet end of the intercooler; the control unit in the air conditioning unit is further configured to selectively communicate the first end of the third three-way valve with the second end or the third end thereof according to an outdoor ambient temperature.
As a preferable technical solution of the air conditioning unit provided by the present invention, the intercooler is configured to share a heat dissipation fan with the air-cooled heat exchanger; the control unit in the air conditioning unit is further configured to adjust the air speed of the cooling fan according to the actual outlet water temperature of the water flow channel.
Then, the invention also provides a control method of the air conditioning unit, wherein a compressor, an air-cooled heat exchanger, an electronic expansion valve and a water-cooled heat exchanger are arranged on a refrigerant circulating pipeline of the air conditioning unit; the water-cooled heat exchanger comprises a plurality of heat exchange units, and each heat exchange unit comprises a refrigerant channel and a water flow channel which exchange heat with each other; the second end of the refrigerant channel of one heat exchange unit in the plurality of heat exchange units is connected with the first end of the refrigerant channel of the next heat exchange unit through a first series pipeline; the first ends of the refrigerant channels of the heat exchange units are connected to the first end of the first shunt pipe, and the second ends of the refrigerant channels of the heat exchange units are connected to the first end of the first collecting pipe; a first on-off valve is arranged between the first end of the refrigerant channel which is simultaneously connected with the first shunt pipe and the first series pipeline and the first shunt pipe, and a second on-off valve is also arranged between the second end of the refrigerant channel which is simultaneously connected with the first collecting pipe and the first series pipeline and the first collecting pipe; a second series pipeline is arranged between the second end of the water flow channel of one heat exchange unit in the plurality of heat exchange units and the first end of the water flow channel of the next heat exchange unit; the first ends of the water flow channels of the heat exchange units are connected to the first end of the second shunt pipe, and the second ends of the water flow channels of the heat exchange units are connected to the first end of the second collecting pipe; a third breaking valve is arranged between the first end of the water flow channel which is simultaneously connected with the second shunt pipe and the second series pipeline and the second shunt pipe, and a fourth breaking valve is also arranged between the second end of the water flow channel which is simultaneously connected with the second collecting pipe and the second series pipeline and the second collecting pipe; the control method comprises the following steps: acquiring a target outlet water temperature of the water flow channel; and selectively opening or closing the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve according to the target outlet water temperature.
As a preferable aspect of the control method of the air conditioning unit according to the present invention, the step of selectively opening or closing the first on-off valve, the second on-off valve, the third on-off valve, and the fourth on-off valve according to the target outlet water temperature includes: under the condition that the air conditioning unit heats, if the target outlet water temperature is greater than or equal to a set first temperature threshold value, closing the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve; if the target outlet water temperature is less than or equal to a preset second temperature threshold, opening the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve; wherein the first temperature threshold is greater than the second temperature threshold.
As a preferable technical solution of the control method of the air conditioning unit provided by the present invention, the control method further includes: acquiring the actual outlet water temperature of the water flow channel; under the heating condition, if the actual effluent temperature is lower than the target effluent temperature, increasing the operating frequency or the exhaust pressure of the compressor; and under the refrigeration condition, if the actual outlet water temperature is higher than the target outlet water temperature, increasing the operating frequency or the exhaust pressure of the compressor.
As a preferable technical solution of the control method of the air conditioning unit provided by the present invention, the control method further includes: acquiring the actual outlet water temperature of the water flow channel; under the heating condition, if the actual outlet water temperature is lower than the target outlet water temperature, increasing the wind speed of a heat dissipation fan configured for the air-cooled heat exchanger; and under the refrigeration condition, if the actual outlet water temperature is higher than the target outlet water temperature, increasing the wind speed of a heat dissipation fan configured on the air-cooled heat exchanger.
As a preferable technical solution of the control method of the air conditioning unit provided by the present invention, the control method further includes: acquiring actual outdoor environment temperature under a heating condition; when the actual outdoor environment temperature is greater than a preset outdoor environment temperature threshold value, conducting a low-pressure outlet and a high-pressure inlet of the compressor; when the actual outdoor environment temperature is less than or equal to a preset outdoor environment temperature threshold value, communicating a low-pressure outlet of the compressor with an inlet end of the intercooler, and communicating an outlet end of the intercooler with a high-pressure inlet of the compressor; or acquiring the actual low-pressure exhaust temperature of the low-pressure outlet of the compressor under the heating condition; when the actual low-pressure exhaust temperature is smaller than a preset exhaust temperature threshold value, conducting a low-pressure outlet and a high-pressure inlet of the compressor; when the actual low-pressure exhaust temperature is greater than or equal to a preset exhaust temperature threshold value, communicating a low-pressure outlet of the compressor with an inlet end of an intercooler, and communicating an outlet end of the intercooler with a high-pressure inlet of the compressor; or acquiring the actual high-pressure exhaust temperature of the high-pressure outlet of the compressor under the heating condition; and when the difference value between the actual high-pressure exhaust temperature and the compressor exhaust temperature protection value is less than or equal to the preset safe temperature difference, communicating a low-pressure outlet of the compressor with an inlet end of the intercooler, and communicating an outlet end of the intercooler with a high-pressure inlet of the compressor.
According to the air conditioning unit and the control method thereof provided by the invention, the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are selectively opened or closed simultaneously according to the target outlet water temperature of the water flow channel. When the outlet water temperature of the water-cooled heat exchanger is higher, the water-cooled heat exchanger is set to be closed when the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all closed, then a plurality of heat exchange units are connected in series, and the heat exchange performance of the water-cooled heat exchanger is ensured through a longer refrigerant channel and a longer water flow channel; when the water outlet temperature of the water-cooled heat exchanger is lower, the water-cooled heat exchanger is set to be opened when the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened, and at the moment, the plurality of heat exchange units are connected in parallel, so that the energy is saved while the flow rate of water is increased by reducing the resistance of the refrigerant channel and the water flow channel. Therefore, the conversion between the series structure and the parallel structure of the water-cooling heat exchanger can be adjusted according to the target outlet water temperature of the water-cooling heat exchanger, and the heating efficiency and the energy conservation of the air conditioning unit are both considered.
In addition, according to the air conditioning unit and the control method thereof provided by the invention, under the heating condition of the air conditioning unit, when the actual outdoor environment temperature is less than or equal to the preset outdoor environment temperature threshold value, the low-pressure outlet of the compressor is communicated with the inlet end of the intercooler, and the outlet end of the intercooler is communicated with the high-pressure inlet of the compressor; or when the actual low-pressure exhaust temperature is greater than or equal to the preset exhaust temperature threshold, communicating a low-pressure outlet of the compressor with an inlet end of the intercooler, and communicating an outlet end of the intercooler with a high-pressure inlet of the compressor; or when the difference value between the actual high-pressure exhaust temperature and the compressor exhaust temperature protection value is smaller than or equal to the preset safe temperature difference, the low-pressure outlet of the compressor is communicated with the inlet end of the intercooler, and the outlet end of the intercooler is communicated with the high-pressure inlet of the compressor. Therefore, the refrigerant between the high compression stage and the low compression stage of the two-stage compressor is cooled through the intercooler, the temperature of the refrigerant entering the high compression stage is further reduced, the exhaust temperature of the high-pressure outlet of the two-stage compressor is reduced, and the exhaust temperature of the high-pressure outlet of the two-stage compressor is prevented from exceeding the protection limit to stop the two-stage compressor. Meanwhile, the heating performance of the air conditioning unit can be improved, and the power consumption and the energy efficiency ratio of the double-stage compressor are reduced.
Drawings
An air conditioning unit and a control method thereof of the present invention will be described below with reference to the accompanying drawings. In the drawings:
fig. 1 is a schematic diagram of a refrigerant circulation pipeline of the air conditioning unit in the refrigeration state according to the present embodiment;
FIG. 2 is a schematic diagram of a refrigerant circulation pipeline of the air conditioning unit in the heating state according to the present embodiment;
fig. 3 is a schematic diagram of refrigerant circulation and water circulation routes of the water-cooled heat exchanger according to the present embodiment in a series state;
fig. 4 is a schematic diagram of refrigerant circulation and water circulation routes of the water-cooled heat exchanger according to the embodiment in a parallel state;
fig. 5 is a flowchart illustrating a control method of the air conditioning unit according to the embodiment.
List of reference numerals
1-a two-stage compressor; 2-an intercooler; 3-air cooling heat exchanger; 4-a water heater; 5-a heat regenerator; 6-electronic expansion valve;
7-water-cooled heat exchanger;
711-a first heat exchange unit; 712-a second heat exchange unit; 713-a third heat exchange unit;
721-a first series line; 722-a second series line;
731-first shunt tube; 732-a second shunt tube;
741-a first manifold; 742-a second manifold;
751-a first on-off valve; 752-second on-off valve; 753-third shutoff valve; 754-fourth shut-off valve;
761-refrigerant check valve; 762-a water flow check valve;
8-a gas-liquid separator; 91-a first three-way valve; 92-a second three-way valve; 93-a third three-way valve; 94-a fourth three-way valve; 10-a main on-off valve; 101-a first one-way valve; 102-a second one-way valve; 103-a third one-way valve; 104-a fourth one-way valve; 111-a first dry filter; 112-a second dry filter; 113-a third filter-drier; 114-a fourth filter-drier; 115-fifth drier-filter.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the first and second series lines are shown with one-way valves, the configuration of the water-cooled heat exchanger is not constant and can be modified as desired by one skilled in the art to suit a particular application without departing from the principles of the present invention. For example, only the solenoid valves may be provided in the first and second series lines.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
[ first embodiment ] A method for manufacturing a semiconductor device
Because the carbon dioxide refrigerant is generally in a supercritical state, the four-way reversing valve cannot perform reversing operation due to high working pressure of the carbon dioxide refrigerant, and therefore the four-way reversing valve cannot realize the conversion between a refrigeration mode and a heating mode, and the existing air conditioning unit applying the carbon dioxide refrigerant can only be used for realizing a single refrigeration system or a single heating system.
In order to solve the problem that the existing air conditioning unit using carbon dioxide refrigerant can only be used for realizing a single refrigeration system or heating system due to the high working pressure of the carbon dioxide refrigerant, the present embodiment provides an air conditioning unit, as shown in fig. 1 and 2, the air conditioning unit includes a two-stage compressor 1, an air-cooled heat exchanger 3 for exchanging heat with outdoor air, a water-cooled heat exchanger 7 for exchanging heat with indoor air, an electronic expansion valve 6, a first three-way valve 91, a second three-way valve 92, a first one-way valve 101, a second one-way valve 102, a third one-way valve 103, and a fourth one-way valve 104; the two-stage compressor 1 has a low pressure chamber and a high pressure chamber, and the two-stage compressor 1 is provided with a low pressure inlet (lower end of the two-stage compressor 1 in fig. 1 and 2) and a low pressure outlet (lower left end of the two-stage compressor 1 in fig. 1 and 2) communicating with the low pressure chamber, and a high pressure inlet (upper left end of the two-stage compressor 1 in fig. 1 and 2) and a high pressure outlet (upper end of the two-stage compressor 1 in fig. 1 and 2) communicating with the high pressure chamber.
The air conditioning unit is provided with a refrigeration cycle pipeline (refer to fig. 1) and a heating cycle pipeline (refer to fig. 2); a first end of the first three-way valve 91 (a lower end of the first three-way valve 91 in fig. 1 and 2) communicates with a high-pressure outlet of the dual-stage compressor 1, and a first end of the second three-way valve 92 (a left end of the second three-way valve 92 in fig. 1 and 2) communicates with a low-pressure inlet of the dual-stage compressor 1.
In the refrigeration cycle line, a second end of the first three-way valve 91 (a left end of the first three-way valve 91 in fig. 1 and 2) communicates with a first end of the air-cooled heat exchanger 3 (a right end of the air-cooled heat exchanger 3 in fig. 1 and 2), a second end of the air-cooled heat exchanger 3 (a left end of the air-cooled heat exchanger 3 in fig. 1 and 2) communicates with an inlet end of the first check valve 101, an outlet end of the first check valve 101 communicates with an inlet end of the electronic expansion valve 6, an outlet end of the electronic expansion valve 6 communicates with an inlet end of the second check valve 102, an outlet end of the second check valve 102 communicates with a first end of the water-cooled heat exchanger 7 (a left end of the water-cooled heat exchanger 7 in fig. 1 and 2, or a place below is referred to as a first flow-merging pipe 741), and a second end of the water-cooled heat exchanger 7 (a right end of the water-cooled heat exchanger 7 in fig. 1 and 2, or a place below is referred to as a first flow-dividing pipe 731) communicates with a second end of the second three-way valve 92 (a lower end of the second three-way valve 92 in fig. 1 and 2).
In the heating cycle line, a third end of the first three-way valve 91 (a right end of the first three-way valve 91 in fig. 1 and 2) communicates with a second end of the water-cooled heat exchanger 7, a first end of the water-cooled heat exchanger 7 communicates with an inlet end of the third check valve 103, an outlet end of the third check valve 103 communicates with an inlet end of the electronic expansion valve 6, an outlet end of the electronic expansion valve 6 communicates with an inlet end of the fourth check valve 104, an outlet end of the fourth check valve 104 communicates with a second end of the air-cooled heat exchanger 3, and a first end of the air-cooled heat exchanger 3 communicates with a third end of the second three-way valve 92 (a right end of the second three-way valve 92 in fig. 1 and 2).
The two-stage compressor 1 is, for example, a compressor that performs compression by using two stages, each stage having one or several cylinders. Compared with a single-stage compressor, the performance of the two-stage compressor 1 in the aspects of specific compression ratio, pressure difference and the like is greatly improved. When the two-stage compressor 1 is used, a refrigerant enters the low-pressure cavity from the low-pressure inlet and is discharged from the low-pressure outlet to complete first compression, and then enters the high-pressure cavity from the high-pressure inlet and is discharged from the high-pressure outlet to complete second compression.
In the cooling mode, the first end and the second end of the first three-way valve 91 are connected, and the first end and the second end of the second three-way valve 92 are connected, and the circulation flow path of the refrigerant in the air conditioning unit is: the two-stage compressor 1 → the first three-way valve 91 → the air-cooled heat exchanger 3 (used as a condenser) → the first one-way valve 101 → the electronic expansion valve 6 → the second one-way valve 102 → the water-cooled heat exchanger 7 (used as an evaporator) → the second three-way valve 92 → the two-stage compressor 1.
In the heating mode, the first end of the first three-way valve 91 is connected to the third end, and the first end of the second three-way valve 92 is connected to the third end, and the circulation flow path of the refrigerant in the air conditioning unit is: the two-stage compressor 1 → the first three-way valve 91 → the water-cooled heat exchanger 7 (used as a condenser) → the third one-way valve 103 → the electronic expansion valve 6 → the fourth one-way valve 104 → the air-cooled heat exchanger 3 (used as an evaporator) → the second three-way valve 92 → the two-stage compressor 1.
It can be understood that although the outlet end of the electronic expansion valve 6 is respectively communicated with the inlet end of the second check valve 102 and the inlet end of the fourth check valve 104, in the air conditioning unit, due to the pressure difference of the refrigerant, the refrigerant always flows from the high-pressure outlet end of the two-stage compressor 1 to the low-pressure inlet end (i.e. the high-pressure part flows to the low-pressure part), while the pressure of the refrigerant between the outlet end of the fourth check valve 104 and the second end of the air-cooled heat exchanger 3 is balanced during cooling, and the refrigerant flowing out of the outlet end of the electronic expansion valve 6 can only pass through the second check valve 102 but cannot pass through the fourth check valve 104; similarly, during heating, the pressure of the refrigerant between the outlet end of the second check valve 102 and the first end of the water-cooled heat exchanger 7 is balanced, and the refrigerant flowing out of the outlet end of the electronic expansion valve 6 can only pass through the fourth check valve 104 but not through the second check valve 102.
In the air conditioning unit provided in this embodiment, the first end of the first three-way valve 91 is communicated with the high-pressure outlet of the two-stage compressor 1, the first end of the second three-way valve 92 is communicated with the low-pressure inlet of the two-stage compressor 1, the first one-way valve 101 and the second one-way valve are disposed in the refrigeration cycle pipeline, and the third one-way valve 103 and the fourth one-way valve 104 are disposed in the heating cycle pipeline. Thus, by adjusting the first three-way valve 91 and the second three-way valve 92, the refrigerant flowing out from the high-pressure outlet of the two-stage compressor 1 can enter the air-cooled heat exchanger 3 and then enter the water-cooled heat exchanger 7 (cooling mode) or enter the water-cooled heat exchanger 7 and then enter the air-cooled heat exchanger 3 (heating mode) so as to realize the conversion between the cooling mode and the heating mode of the air conditioning unit using the carbon dioxide refrigerant.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a water heater 4; the inlet end of the water heater 4 is respectively communicated with the outlet end of the first one-way valve 101 and the outlet end of the third one-way valve 103, and the outlet end of the water heater 4 is communicated with the inlet end of the electronic expansion valve 6.
Illustratively, as will be understood by those skilled in the art, the water heater 4 is a heat pump water heater 4, and the water heater 4 is provided with a refrigerant circulation line and a water flow line, so as to achieve the purpose of heating water by heat exchange between refrigerant and water. Therefore, the temperature of the refrigerant between the inlet end of the electronic expansion valve 6 and the second end of the air-cooled heat exchanger 3 during refrigeration can be further reduced, the temperature of the refrigerant between the inlet end of the electronic expansion valve 6 and the first end of the water-cooled heat exchanger 7 during heating can be further reduced, the refrigeration and heating efficiency of the air conditioning unit can be improved, and meanwhile, hot water in the water heater 4 can be heated and then used for providing domestic water.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes an intercooler 2; the inlet end of the intercooler 2 is communicated with the low-pressure outlet of the two-stage compressor 1, and the outlet end of the intercooler 2 is communicated with the high-pressure inlet of the two-stage compressor 1.
Illustratively, the intercoolers 2 are also referred to as compressor intercoolers, interstage coolers, etc., with the intercoolers 2 being cooled mostly with water and less with air. The intercooler 2 cools the refrigerant between the high compression stage and the low compression stage of the two-stage compressor 1, so that the temperature of the refrigerant entering the high compression stage is further reduced, and the exhaust temperature of the high-pressure outlet of the two-stage compressor 1 is reduced, so that the refrigerating capacity of the air conditioning unit is improved, and the power consumption and the energy efficiency ratio of the two-stage compressor 1 are reduced.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a third three-way valve 93; a first end of the third three-way valve 93 is communicated with a low-pressure outlet of the two-stage compressor 1; a second end of the third three-way valve 93 is communicated with an outlet end of the intercooler 2 and a high-pressure inlet of the two-stage compressor 1; the third end of the third three-way valve 93 communicates with the inlet end of the intercooler 2.
By way of example, the use of an intercooler 2 in the two-stage compressor 1 during heating in winter, although it is possible to reduce the power consumption and the energy efficiency ratio of the compressor, at the same time, the heating capacity of the air conditioning unit is reduced. During refrigeration, the refrigerant can pass through the intercooler 2 by adjusting the third three-way valve 93; in heating, the refrigerant may be selectively passed through the intercooler 2. For example, when the outdoor temperature is lower than-30 ℃, the refrigerant passes through the intercooler 2; when the outdoor temperature is higher than-30 ℃, the low-pressure outlet and the high-pressure inlet of the two-stage compressor 1 are directly communicated without passing through the intercooler 2. Therefore, optimal selection can be realized between reducing the power consumption of the two-stage compressor 1 and improving the heating and cooling effects of the air conditioning unit.
As a preferred embodiment of the air conditioning unit provided in this embodiment, generally, the air-cooled heat exchanger 3 is installed outdoors, and a heat dissipation fan for improving heat exchange efficiency between the air-cooled heat exchanger 3 and outdoor air is installed in the outdoor unit, and for making the best use of the things and saving cost, the intercooler 2 may be installed to share the heat dissipation fan with the air-cooled heat exchanger 3.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a heat regenerator 5, where the heat regenerator 5 has an evaporation chamber and a condensation chamber that exchange heat with each other; the evaporation chamber communicates a first end of the second three-way valve 92 with the low-pressure inlet of the two-stage compressor 1; the condensation chamber communicates the outlet end of the water heater 4 with the inlet end of the electronic expansion valve 6.
Illustratively, the refrigerant in the condensation cavity exchanges heat with the refrigerant in the evaporation cavity, and the condensation cavity enables the refrigerant entering the water-cooling heat exchanger 7 (used as an evaporator) to release heat and supercool during refrigeration, so that throttling loss is reduced, and the refrigeration effects of the water-cooling heat exchanger 7 and the air conditioning unit are improved; meanwhile, the evaporation cavity enables the refrigerant entering the two-stage compressor 1 to absorb heat and become superheated steam, so that liquid impact of the two-stage compressor 1 is prevented, and harmful overheating is reduced.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a fourth three-way valve 94; a first end of the fourth three-way valve 94 is communicated with the outlet end of the water heater 4, and a second end of the fourth three-way valve 94 is communicated with the inlet end of the condensation chamber; the third end of the fourth three-way valve 94 is communicated with the outlet end of the condensation chamber and the inlet end of the electronic expansion valve 6. So, make to pass through the refrigerant and improve air conditioning unit's refrigeration effect through adjusting fourth three-way valve 94 under cold and hot state, make not pass through the condensation chamber with the refrigerant through adjusting fourth three-way valve 94 under the heating state, do not need regenerator 5 to play a role this moment promptly. Alternatively, it will be understood by those skilled in the art that the fourth three-way valve 94 may also be configured to control the refrigerant to enter the dual-stage compressor 1 through the evaporation chamber of the regenerator 5, or to directly enter the dual-stage compressor 1 without passing through the evaporation chamber of the regenerator 5.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a gas-liquid separator 8; the gas-liquid separator 8 communicates the first end of the second three-way valve 92 with the inlet end of the evaporation chamber. Therefore, the refrigerant at the air suction end of the compressor can be guaranteed to be gaseous, and the liquid impact of the liquid suction of the compressor is prevented from being damaged.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the air conditioning unit further includes at least one of a first filter drier 111, a second filter drier 112, a third filter drier 113, a fourth filter drier 114, and a fifth filter drier 115; the first dry filter 111 communicates the second end of the air-cooled heat exchanger 3 with the inlet end of the first check valve 101; the second dry filter 112 communicates the outlet end of the electronic expansion valve 6 with the inlet end of the second check valve 102; the third dry filter 113 communicates the first end of the water-cooled heat exchanger 7 with the inlet end of the third check valve 103; the fourth dry filter 114 communicates the outlet end of the electronic expansion valve 6 with the inlet end of the fourth check valve 104; the fifth dry filter 115 communicates the outlet port side of the first check valve 101 with the inlet port side of the electronic expansion valve 6.
Illustratively, the inlet ends of the first check valve 101, the second check valve 102, the third check valve 103, the fourth check valve 104 and the electronic expansion valve 6 are provided with drying filters to filter impurities in the refrigerant, so as to prevent the air conditioning unit from being blocked.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a main on-off valve 10, and the main on-off valve 10 is disposed between the high-pressure outlet of the two-stage compressor 1 and the first end of the first three-way valve 91. The main on-off valve 10 is used to open the refrigerant passage when the air conditioning unit is in use and to cut off the refrigerant passage when the air conditioning unit is stopped.
The water-cooled heat exchanger 7 of this embodiment includes the refrigerant passageway and the rivers passageway that carry out the heat transfer each other, and the rivers passageway among the water-cooled heat exchanger 7 forms hydrologic cycle through between water circulation pipeline and the indoor heat exchanger, with heat or cold volume transmission to indoor. Generally, a water pump is arranged on a water circulation pipeline, power is provided for water flow in the water circulation pipeline through the water pump, indoor heating or cooling is performed through the water circulation pipeline, the using amount of a refrigerant can be reduced, and the cooling and heating effects of an air conditioning unit are more stable.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
[ second embodiment ]
In order to solve the problem that the structure of the water-cooling heat exchanger is fixed and unchanged in the working process of the existing air conditioning unit, so that the heating efficiency and the energy saving cannot be considered, the embodiment provides the water-cooling heat exchanger 7 and the air conditioning unit.
First, as shown in fig. 3 and 4, the water-cooled heat exchanger 7 provided in this embodiment includes a plurality of heat exchange units (the water-cooled heat exchanger 7 shown in fig. 3 includes a first heat exchange unit 711, a second heat exchange unit 712, and a third heat exchange unit 713), each of which includes a refrigerant channel and a water flow channel that exchange heat with each other; the second end of the refrigerant channel of one heat exchange unit in the plurality of heat exchange units is connected with the first end of the refrigerant channel of the next heat exchange unit through a first serial pipeline 721, and the first serial pipeline 721 is provided with a refrigerant valve; first ends of refrigerant channels of the plurality of heat exchange units are connected to a first end of the first shunt pipe 731, and second ends of the refrigerant channels of the plurality of heat exchange units are connected to a first end of the first collecting pipe 741; a first on-off valve 751 is disposed between a first end of the refrigerant passage to which the first flow dividing pipe 731 and the first serial pipe 721 are connected and the first flow dividing pipe 731, and a second on-off valve 752 is disposed between a second end of the refrigerant passage to which the first manifold 741 and the first serial pipe 721 are connected and the first manifold 741.
Meanwhile, a second series pipeline 722 is arranged between the second end of the water flow channel of one heat exchange unit in the plurality of heat exchange units and the first end of the water flow channel of the next heat exchange unit, and a water flow valve is arranged on the second series pipeline 722; first ends of the water flow channels of the plurality of heat exchange units are all connected to the first end of the second shunt pipe 732, and second ends of the water flow channels of the plurality of heat exchange units are all connected to the first end of the second collecting pipe 742; a third shut-off valve 753 is provided between the first end of the water flow passage to which the second branch pipe 732 and the second series pipe 722 are connected and the second branch pipe 732, and a fourth shut-off valve 754 is provided between the second end of the water flow passage to which the second collecting pipe 742 and the second series pipe 722 are connected and the second collecting pipe 742.
Illustratively, in the heating process of the air conditioning unit, the air conditioning unit generally needs to be usedThe heat exchange quantity of the refrigerant and the water flow in unit time is in a certain optimal range so as to ensure the heat exchange efficiency of the water-cooling heat exchanger 7. According to the formula, Q ═ cm (T)2-T1) Wherein Q is the heat exchange amount in unit time, c is the specific heat capacity of water, m is the mass (or water flow) of water participating in heat exchange in unit time, and T2For the inlet water temperature of the cold heat exchanger, T1The inlet water temperature of the water-cooled heat exchanger 7. Assuming that the heat exchange quantity Q in unit time is kept constant, the water inlet temperature T of the water-cooled heat exchanger 71Under certain conditions, the higher outlet water temperature T of the water-cooled heat exchanger 7 is required to be realized2A smaller water flow m is required to achieve sufficient heat exchange; and when the outlet water temperature is lower, the sufficient heat exchange can be realized only by needing larger water flow m.
In the water-cooled heat exchanger 7 provided in this embodiment, when the outlet water temperature of the water-cooled heat exchanger 7 is high, the water-cooled heat exchanger 7 is set such that the first on-off valve 751, the second on-off valve 752, the third on-off valve 753, and the fourth on-off valve 754 are all closed, and at this time, the plurality of heat exchange units are connected in series, and the heat exchange performance of the water-cooled heat exchanger 7 is ensured through a long refrigerant channel and a long water flow channel.
The water-cooled heat exchanger 7 shown in fig. 3 includes a first heat exchange unit 711, a second heat exchange unit 712, and a third heat exchange unit 713, and when a plurality of heat exchange units are connected in series, a flow line of a refrigerant in fig. 3 is represented by ": the first diverging pipe 731 → the first end of the refrigerant channel of the first heat exchange unit 711 → the second end of the refrigerant channel of the first heat exchange unit 711 → the first end of the refrigerant channel of the second heat exchange unit 712 → the second end of the refrigerant channel of the second heat exchange unit 712 → the first end of the refrigerant channel of the third heat exchange unit 713 → the second end of the refrigerant channel of the first heat exchange unit 711 → the first collecting pipe 741.
Meanwhile, the water flow path is represented by "": the second diverging pipe 732 → the first end of the water flow passage of the third heat exchange unit 713 → the second end of the water flow passage of the third heat exchange unit 713 → the first end of the water flow passage of the second heat exchange unit 712 → the second end of the water flow passage of the second heat exchange unit 712 → the first end of the water flow passage of the first heat exchange unit 711 → the second collecting pipe 742.
When the outlet water temperature of the water-cooled heat exchanger 7 is low, the water-cooled heat exchanger 7 is set to be opened when the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are all opened, and then the plurality of heat exchange units are connected in parallel, so that the flow rate of water is increased and energy is saved by reducing the resistance of a refrigerant channel and a water flow channel.
The water-cooled heat exchanger 7 shown in fig. 4 includes a first heat exchange unit 711, a second heat exchange unit 712, and a third heat exchange unit 713, and when a plurality of heat exchange units are connected in parallel, a flow path of a refrigerant in fig. 4 is represented by ": the first flow dividing pipe 731 → the first end of the refrigerant channel of the first heat exchange unit 711, the first end of the refrigerant channel of the second heat exchange unit 712 and the first end of the refrigerant channel of the third heat exchange unit 713 → the second end of the refrigerant channel of the first heat exchange unit 711, the second end of the refrigerant channel of the second heat exchange unit 712 and the second end of the refrigerant channel of the third heat exchange unit 713 → the first collecting pipe 741.
Meanwhile, the water flow path is represented by "": the second diverging pipe 732 → the first end of the water flow passage of the third heat exchange unit 713, the first end of the water flow passage of the second heat exchange unit 712, and the first end of the water flow passage of the first heat exchange unit 711 → the second end of the water flow passage of the third heat exchange unit 713, the second end of the water flow passage of the second heat exchange unit 712, the second end of the water flow passage of the first heat exchange unit 711 → the second collecting pipe 742.
It should be understood that, although the water-cooled heat exchanger 7 in the present embodiment and the drawings is described by taking 3 heat exchange units as an example, the number of the heat exchange units of the water-cooled heat exchanger 7 in the present embodiment should be at least two, that is, two or more.
It can be understood that, in this embodiment, the refrigerant valve disposed on the first serial pipe 721 may be a refrigerant check valve 761, and the refrigerant check valve 761 is configured to only allow the refrigerant to flow from the second end of the refrigerant channel of one heat exchange unit to the first end of the refrigerant channel of the next heat exchange unit; the water flow valve provided on the second series line 722 may be a water flow check valve 762. the water flow check valve 762 is provided to allow water flow only from the second end of the water flow passage of one heat exchange unit to the first end of the water flow passage of the next heat exchange unit.
Thus, under the condition that the plurality of heat exchange units are connected in parallel, the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are all opened, and the refrigerant one-way valve 761 plays a role of preventing the refrigerant from directly flowing to the first collecting pipe 741 through the first serial pipeline 721 from the first shunt pipe 731 without passing through the heat exchange units; meanwhile, the water flow check valve 762 plays a role of preventing water from flowing from the second diverging pipe 732 directly to the second collecting pipe 742 through the second series line 722 without passing through the heat exchange unit.
In addition, the refrigerant valve disposed in the first serial pipe 721 may be a refrigerant solenoid valve, and the water flow valve disposed in the second serial pipe 722 may be a water flow solenoid valve. Thus, under the condition that the plurality of heat exchange units are connected in parallel, the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are all opened, and the refrigerant electromagnetic valve and the water flow electromagnetic valve are both closed at the same time, so that the function of preventing the refrigerant from directly flowing to the first collecting pipe 741 through the first serial pipeline 721 by the first shunt pipe 731 without passing through the heat exchange unit is achieved, and the function of preventing the water from directly flowing to the second collecting pipe 742 through the second serial pipeline 722 by the second shunt pipe 732 without passing through the heat exchange unit is achieved.
It can be understood that the refrigerant valve, the refrigerant check valve 761, the refrigerant solenoid valve, the water flow check valve 762, and the water flow solenoid valve in this embodiment are all the existing common valves, and the names are only for distinguishing, and are not intended to be an improper limitation on the above-mentioned valves in this embodiment, and should not be understood as belonging to a special valve. For example, the refrigerant check valve 761 and the water check valve 762 are common check valves, and the refrigerant solenoid valve and the water solenoid valve are common solenoid valves.
In summary, the water-cooled heat exchanger 7 provided in this embodiment can adjust the conversion between the series structure and the parallel structure of the water-cooled heat exchanger 7 according to the target outlet water temperature of the water-cooled heat exchanger 7, and the heating efficiency and the energy saving of the air conditioning unit are both considered.
As a preferred embodiment of the water-cooled heat exchanger 7 provided in this embodiment, the water-cooled heat exchanger 7 is arranged such that the flow direction of the refrigerant in the refrigerant channel is opposite to the flow direction of the water flow in the water flow channel. So set up, along the direction of rivers, the temperature of refrigerant is more and more high to play the effect of transmitting rivers better with the temperature of refrigerant, thereby guarantee water-cooled heat exchanger 7's heat exchange efficiency.
As a preferred embodiment of the water-cooled heat exchanger 7 provided in this embodiment, first ends of a plurality of refrigerant passages to which the first flow dividing pipe 731 and the first series pipe 721 are simultaneously connected share a first on-off valve 751; and/or a second end of the refrigerant channel to which the first collecting pipe 741 and the first series pipe 721 are connected at the same time shares a second cut-off valve 752; and/or the first ends of the water flow passages to which the second shunt pipe 732 and the second series pipe 722 are connected at the same time share a third cut-off valve 753; and/or the second ends of the water flow paths to which the second manifold 742 and the second series line 722 are connected at the same time share a fourth shut-off valve 754.
By the arrangement, the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are shared on corresponding pipelines, so that the number of the on-off valves is reduced, and the refrigerant and water flow can be simultaneously and accurately controlled.
Then, referring to fig. 1 and fig. 2, the present embodiment further provides an air conditioning unit, which includes a compressor, an air-cooled heat exchanger 3, an electronic expansion valve 6, and a water-cooled heat exchanger 7 in any of the above embodiments.
It should be understood that, although the switching between the cooling mode and the heating mode of the air conditioning unit is realized by the first three-way valve 91 and the second three-way valve 92 in fig. 1 and 2 of this embodiment, as another realizable mode, the purpose may also be realized by a four-way reversing valve, and since the switching between the cooling mode and the heating mode of the air conditioning unit realized by the four-way reversing valve belongs to the implementation mode in the prior art, it is not described herein again.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a first three-way valve 91, a second three-way valve 92, a first one-way valve 101, a second one-way valve 102, a third one-way valve 103, and a fourth one-way valve 104; the compressor is a two-stage compressor 1, the two-stage compressor 1 is provided with a low-pressure cavity and a high-pressure cavity, and the two-stage compressor 1 is provided with a low-pressure inlet and a low-pressure outlet which are communicated with the low-pressure cavity, and a high-pressure inlet and a high-pressure outlet which are communicated with the high-pressure cavity; a refrigeration cycle pipeline and a heating cycle pipeline are formed in the air conditioning unit; a first end of the first three-way valve 91 communicates with the high-pressure outlet of the two-stage compressor 1, and a first end of the second three-way valve 92 communicates with the low-pressure inlet of the two-stage compressor 1.
In the refrigeration cycle pipeline, the second end of the first three-way valve 91 is communicated with the first end of the air-cooled heat exchanger 3, the second end of the air-cooled heat exchanger 3 is communicated with the inlet end of the first one-way valve 101, the outlet end of the first one-way valve 101 is communicated with the inlet end of the electronic expansion valve 6, the outlet end of the electronic expansion valve 6 is communicated with the inlet end of the second one-way valve 102, the outlet end of the second one-way valve 102 is communicated with the shunt pipe of the water-cooled heat exchanger 7, and the first confluence pipe 741 of the water-cooled heat exchanger 7 is communicated with the second end of the second three-way valve 92.
In the heating circulation pipeline, the third end of the first three-way valve 91 is communicated with the first collecting pipe 741 of the water-cooled heat exchanger 7, the shunt pipe of the water-cooled heat exchanger 7 is communicated with the inlet end of the third one-way valve 103, the outlet end of the third one-way valve 103 is communicated with the inlet end of the electronic expansion valve 6, the outlet end of the electronic expansion valve 6 is communicated with the inlet end of the fourth one-way valve 104, the outlet end of the fourth one-way valve 104 is communicated with the second end of the air-cooled heat exchanger 3, and the first shunt pipe 731 of the air-cooled heat exchanger 3 is communicated with the third end of the second three-way valve 92.
In addition, because the carbon dioxide refrigerant is generally in a supercritical state, the four-way reversing valve cannot perform reversing operation due to high working pressure of the carbon dioxide refrigerant, and therefore the four-way reversing valve cannot realize the switching between the refrigeration mode and the heating mode, so that the existing air conditioning units applying the carbon dioxide refrigerant have the same functions as the heat pump refrigeration system and can only be used for realizing a single refrigeration system or heating system.
In contrast, in the air conditioning unit according to the present invention, the first end of the first three-way valve 91 is communicated with the high-pressure outlet of the two-stage compressor 1, the first end of the second three-way valve 92 is communicated with the low-pressure inlet of the two-stage compressor 1, the first check valve 101 and the second check valve are provided in the refrigeration cycle line, and the third check valve 103 and the fourth check valve 104 are provided in the heating cycle line. Thus, by adjusting the first three-way valve 91 and the second three-way valve 92, the refrigerant flowing out from the high-pressure outlet of the two-stage compressor 1 can enter the first heat exchanger and then enter the second heat exchanger, or enter the second heat exchanger and then enter the first heat exchanger, so that the conversion between the refrigeration mode and the heating mode of the heat pump system using the carbon dioxide refrigerant is realized.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes an intercooler 2; the inlet end of the intercooler 2 is communicated with the low-pressure outlet of the two-stage compressor 1, and the outlet end of the intercooler 2 is communicated with the high-pressure inlet of the two-stage compressor 1.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a third three-way valve 93; a first end of the third three-way valve 93 is communicated with a low-pressure outlet of the two-stage compressor 1; a second end of the third three-way valve 93 is communicated with an outlet end of the intercooler 2 and a high-pressure inlet of the two-stage compressor 1; the third end of the third three-way valve 93 communicates with the inlet end of the intercooler 2.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the intercooler 2 is disposed to share a heat radiation fan with the air-cooled heat exchanger 3.
[ third embodiment ]
In order to solve the above problems in the prior art, that is, to solve the problem that the existing air conditioning unit cannot give consideration to both heating efficiency and energy saving due to the fixed structure of the water-cooling heat exchanger in the working process of the air conditioning unit, the present embodiment provides an air conditioning unit and a control method thereof.
First, as shown in fig. 1 to 4, the present embodiment provides an air conditioning unit, in which a compressor, an air-cooled heat exchanger 3, an electronic expansion valve 6, and a water-cooled heat exchanger 7 are disposed on a refrigerant circulation line of the air conditioning unit; the water-cooled heat exchanger 7 includes a plurality of heat exchange units, and each heat exchange unit includes a refrigerant passage and a water flow passage that exchange heat with each other.
The second end of the refrigerant channel of one heat exchange unit in the plurality of heat exchange units is connected with the first end of the refrigerant channel of the next heat exchange unit through a first serial pipeline 721; first ends of refrigerant channels of the plurality of heat exchange units are connected to a first end of the first shunt pipe 731, and second ends of the refrigerant channels of the plurality of heat exchange units are connected to a first end of the first collecting pipe 741; a first on-off valve 751 is disposed between a first end of the refrigerant passage to which the first flow dividing pipe 731 and the first serial pipe 721 are connected and the first flow dividing pipe 731, and a second on-off valve 752 is disposed between a second end of the refrigerant passage to which the first manifold 741 and the first serial pipe 721 are connected and the first manifold 741.
A second series pipeline 722 is arranged between the second end of the water flow channel of one heat exchange unit in the plurality of heat exchange units and the first end of the water flow channel of the next heat exchange unit; first ends of the water flow channels of the plurality of heat exchange units are all connected to the first end of the second shunt pipe 732, and second ends of the water flow channels of the plurality of heat exchange units are all connected to the first end of the second collecting pipe 742; a third shut-off valve 753 is arranged between the first end of the water flow passage connected with the second shunt pipe 732 and the second series pipeline 722 and the second shunt pipe 732, and a fourth shut-off valve 754 is arranged between the second end of the water flow passage connected with the second collecting pipe 742 and the second series pipeline 722 and the second collecting pipe 742; the control unit in the air conditioning unit is arranged to selectively open or close the first 751, second 752, third 753 and fourth 754 on-off valves simultaneously depending on the target leaving water temperature of the water flow channel.
For example, it is to be noted that, in practical applications, the control unit of the air conditioning unit in the foregoing embodiment may complete the above function units by different function units according to needs, that is, the function units in this embodiment are further decomposed or combined, for example, the function units in the foregoing embodiment may be further split into a plurality of sub-units to complete all or part of the functions described above.
It should be understood that, although the switching between the cooling mode and the heating mode of the air conditioning unit is realized by the first three-way valve 91 and the second three-way valve 92 in fig. 1 and 2 of this embodiment, as another realizable mode, the purpose may also be realized by a four-way reversing valve, and since the switching between the cooling mode and the heating mode of the air conditioning unit realized by the four-way reversing valve belongs to the implementation mode in the prior art, it is not described herein again.
According to the air conditioning unit provided by the embodiment, the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are selectively opened or closed at the same time according to the target outlet water temperature of the water flow channel. When the outlet water temperature of the water-cooled heat exchanger 7 is high, the water-cooled heat exchanger 7 is set to be closed when the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are closed, and then a plurality of heat exchange units are connected in series, so that the heat exchange performance of the water-cooled heat exchanger 7 is ensured through a long refrigerant channel and a long water flow channel.
Meanwhile, when the outlet water temperature of the water-cooled heat exchanger 7 is low, the water-cooled heat exchanger 7 is set to be opened when the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are all opened, and at the moment, the plurality of heat exchange units are connected in parallel, so that the flow rate of water is increased and energy is saved by reducing the resistance of a refrigerant channel and a water flow channel. Therefore, the conversion between the series structure and the parallel structure of the water-cooling heat exchanger 7 can be adjusted according to the target outlet water temperature of the water-cooling heat exchanger 7, and the heating efficiency and the energy conservation of the air conditioning unit are both considered.
As shown in fig. 1 to 4, as a preferred embodiment of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a first three-way valve 91, a second three-way valve 92, a first check valve 101, a second check valve 102, a third check valve 103, and a fourth check valve 104; the compressor is a two-stage compressor 1, the two-stage compressor 1 is provided with a low-pressure cavity and a high-pressure cavity, and the two-stage compressor 1 is provided with a low-pressure inlet and a low-pressure outlet which are communicated with the low-pressure cavity, and a high-pressure inlet and a high-pressure outlet which are communicated with the high-pressure cavity; the refrigerant circulating pipeline of the air conditioning unit comprises a refrigeration circulating pipeline and a heating circulating pipeline; a first end of the first three-way valve 91 communicates with the high-pressure outlet of the two-stage compressor 1, and a first end of the second three-way valve 92 communicates with the low-pressure inlet of the two-stage compressor 1.
In the refrigeration cycle pipeline, the second end of the first three-way valve 91 is communicated with the first end of the air-cooled heat exchanger 3, the second end of the air-cooled heat exchanger 3 is communicated with the inlet end of the first one-way valve 101, the outlet end of the first one-way valve 101 is communicated with the inlet end of the electronic expansion valve 6, the outlet end of the electronic expansion valve 6 is communicated with the inlet end of the second one-way valve 102, the outlet end of the second one-way valve 102 is communicated with the shunt pipe of the water-cooled heat exchanger 7, and the confluence pipe of the water-cooled heat exchanger 7 is communicated with the second end of the second three-way valve 92.
In the heating circulation pipeline, a third end of the first three-way valve 91 is communicated with a first collecting pipe 741 of the water-cooled heat exchanger 7, a shunt pipe of the water-cooled heat exchanger 7 is communicated with an inlet end of a third one-way valve 103, an outlet end of the third one-way valve 103 is communicated with an inlet end of an electronic expansion valve 6, an outlet end of the electronic expansion valve 6 is communicated with an inlet end of a fourth one-way valve 104, an outlet end of the fourth one-way valve 104 is communicated with a second end of the air-cooled heat exchanger 3, and a first shunt pipe 731 of the air-cooled heat exchanger 3 is communicated with a third end of the second three-way valve 92; the control unit in the air conditioning unit is also configured to selectively conduct one of the refrigeration cycle line and the heating cycle line according to the requirement of refrigeration or heating.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes an intercooler 2; the inlet end of the intercooler 2 is communicated with the low-pressure outlet of the two-stage compressor 1, and the outlet end of the intercooler 2 is communicated with the high-pressure inlet of the two-stage compressor 1.
As a preferred implementation of the air conditioning unit provided in this embodiment, the air conditioning unit further includes a third three-way valve 93; a first end of the third three-way valve 93 is communicated with a low-pressure outlet of the two-stage compressor 1; a second end of the third three-way valve 93 is communicated with an outlet end of the intercooler 2 and a high-pressure inlet of the two-stage compressor 1; the third end of the third three-way valve 93 communicates with the inlet end of the intercooler 2; the control unit in the air conditioning unit is further arranged to selectively switch the first end of the third three-way valve 93 to its second or third end depending on the outdoor ambient temperature.
As a preferred embodiment of the air conditioning unit provided in this embodiment, the intercooler 2 is configured to share a heat radiation fan with the air-cooled heat exchanger 3; the control unit in the air conditioning unit is also arranged to adjust the air speed of the cooling fan according to the actual outlet water temperature of the water flow channel.
Then, the present embodiment further provides a control method of an air conditioning unit, as shown in fig. 1 to 4, a compressor, an air-cooled heat exchanger 3, an electronic expansion valve 6 and a water-cooled heat exchanger 7 are arranged on a refrigerant circulation pipeline of the air conditioning unit; the water-cooled heat exchanger 7 comprises a plurality of heat exchange units, and each heat exchange unit comprises a refrigerant channel and a water flow channel which exchange heat with each other;
the second end of the refrigerant channel of one heat exchange unit in the plurality of heat exchange units is connected with the first end of the refrigerant channel of the next heat exchange unit through a first serial pipeline 721; first ends of refrigerant channels of the plurality of heat exchange units are connected to a first end of the first shunt pipe 731, and second ends of the refrigerant channels of the plurality of heat exchange units are connected to a first end of the first collecting pipe 741; a first on-off valve 751 is disposed between a first end of the refrigerant passage to which the first flow dividing pipe 731 and the first serial pipe 721 are connected and the first flow dividing pipe 731, and a second on-off valve 752 is disposed between a second end of the refrigerant passage to which the first manifold 741 and the first serial pipe 721 are connected and the first manifold 741.
A second series pipeline 722 is arranged between the second end of the water flow channel of one heat exchange unit in the plurality of heat exchange units and the first end of the water flow channel of the next heat exchange unit; first ends of the water flow channels of the plurality of heat exchange units are all connected to the first end of the second shunt pipe 732, and second ends of the water flow channels of the plurality of heat exchange units are all connected to the first end of the second collecting pipe 742; a third shut-off valve 753 is arranged between the first end of the water flow passage connected with the second shunt pipe 732 and the second series pipeline 722 and the second shunt pipe 732, and a fourth shut-off valve 754 is arranged between the second end of the water flow passage connected with the second collecting pipe 742 and the second series pipeline 722 and the second collecting pipe 742; as shown in fig. 5, the method for controlling the air conditioning unit in this embodiment includes:
s1, acquiring the target outlet water temperature of the water flow channel;
and S2, selectively opening or closing the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 according to the target outlet water temperature.
As a preferred embodiment of the control method for the air conditioning unit according to the present embodiment, the step of "selectively opening or closing the first on-off valve 751, the second on-off valve 752, the third on-off valve 753, and the fourth on-off valve 754 according to the target outlet water temperature" in step S2 includes:
s21, under the condition that the air conditioning unit heats, if the target outlet water temperature is greater than or equal to a set first temperature threshold value, closing the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754;
s22, under the condition that the air conditioning unit heats, if the target outlet water temperature is less than or equal to a preset second temperature threshold value, opening a first on-off valve 751, a second on-off valve 752, a third on-off valve 753 and a fourth on-off valve 754; wherein the first temperature threshold is greater than the second temperature threshold.
For example, when the air conditioning unit heats, under the condition that the inlet water temperature of the water-cooling heat exchanger 7 is 36 ℃, the target outlet water temperature set by the water-cooling heat exchanger 7 is generally 41 ℃ and 65 ℃, and when the target outlet water temperature is 65 ℃, the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are closed, that is, a plurality of heat exchange units are connected in series, so that the water flow rate is increased and the heat exchange performance is enhanced; when the target outlet water temperature is 41 ℃, the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are opened, namely, a plurality of heat exchange units are connected in parallel, so that the heat exchange area is reduced and the resistance of a water path is reduced.
It should be noted that, although the first temperature threshold and the second temperature threshold of the present embodiment are described in the present embodiment in the case that the first temperature threshold is 41 ℃ and the second temperature threshold is 65 ℃, it is understood that other temperature values set by a person skilled in the art for the first temperature threshold and the second temperature threshold also belong to the range described in the present embodiment.
According to the control method of the air conditioning unit provided by the embodiment, the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are selectively opened or closed at the same time according to the target outlet water temperature of the water flow channel. When the outlet water temperature of the water-cooled heat exchanger 7 is high, the water-cooled heat exchanger 7 is set to be closed when the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are closed, and then a plurality of heat exchange units are connected in series, so that the heat exchange performance of the water-cooled heat exchanger 7 is ensured through a long refrigerant channel and a long water flow channel.
Meanwhile, when the outlet water temperature of the water-cooled heat exchanger 7 is low, the water-cooled heat exchanger 7 is set to be opened when the first on-off valve 751, the second on-off valve 752, the third on-off valve 753 and the fourth on-off valve 754 are all opened, and at the moment, the plurality of heat exchange units are connected in parallel, so that the flow rate of water is increased and energy is saved by reducing the resistance of a refrigerant channel and a water flow channel. Therefore, the conversion between the series structure and the parallel structure of the water-cooling heat exchanger 7 can be adjusted according to the target outlet water temperature of the water-cooling heat exchanger 7, and the heating efficiency and the energy conservation of the air conditioning unit are both considered.
As a preferable implementation of the control method for the air conditioning unit provided in this embodiment, the control method further includes: acquiring the actual outlet water temperature of the water flow channel; under the heating condition, if the actual outlet water temperature is lower than the target outlet water temperature, increasing the operation frequency or the exhaust pressure of the compressor; and under the refrigeration condition, if the actual outlet water temperature is higher than the target outlet water temperature, increasing the operating frequency or the exhaust pressure of the compressor.
Therefore, in the control method of the air conditioning unit of this embodiment, the actual outlet water temperature of the water-cooled heat exchanger 7 can meet the requirement of the target outlet water temperature by adjusting the operating frequency or the exhaust pressure of the compressor, so as to ensure the cooling or heating performance of the air conditioning unit.
As a preferable implementation of the control method for the air conditioning unit provided in this embodiment, the control method further includes: acquiring the actual outlet water temperature of the water flow channel; under the heating condition, if the actual outlet water temperature is lower than the target outlet water temperature, the wind speed of a heat dissipation fan configured on the air-cooled heat exchanger 3 is increased; under the refrigeration condition, if the actual outlet water temperature is higher than the target outlet water temperature, the wind speed of a heat radiation fan configured on the air-cooled heat exchanger 3 is increased.
Therefore, the control method of the air conditioning unit in this embodiment further adjusts the air speed of the cooling fan configured in the air-cooled heat exchanger 3 to ensure that the actual outlet water temperature of the water-cooled heat exchanger 7 can meet the requirement of the target outlet water temperature, thereby ensuring the refrigeration or heating performance of the air conditioning unit.
As a preferable implementation of the control method for the air conditioning unit provided in this embodiment, the control method further includes: acquiring actual outdoor environment temperature under a heating condition; when the actual outdoor environment temperature is greater than the preset outdoor environment temperature threshold value, the low-pressure outlet and the high-pressure inlet of the compressor are communicated; when the actual outdoor ambient temperature is less than or equal to the preset outdoor ambient temperature threshold, the low-pressure outlet of the compressor is communicated with the inlet end of the intercooler 2, and the outlet end of the intercooler 2 is communicated with the high-pressure inlet of the compressor.
As another embodiment, the actual low pressure discharge temperature of the low pressure outlet of the compressor is taken under heating conditions; when the actual low-pressure exhaust temperature is smaller than a preset exhaust temperature threshold value, conducting a low-pressure outlet and a high-pressure inlet of the compressor; when the actual low pressure discharge temperature is greater than or equal to the preset discharge temperature threshold, the low pressure outlet of the compressor is conducted with the inlet end of the intercooler 2, and the outlet end of the intercooler 2 is conducted with the high pressure inlet of the compressor.
As another embodiment, the actual high-pressure discharge temperature of the high-pressure outlet of the compressor is obtained under heating conditions; when the difference between the actual high-pressure exhaust temperature and the compressor exhaust temperature protection value is less than or equal to the preset safe temperature difference, the low-pressure outlet of the compressor is communicated with the inlet end of the intercooler 2, and the outlet end of the intercooler 2 is communicated with the high-pressure inlet of the compressor.
In this way, the intercooler 2 cools the refrigerant between the high compression stage and the low compression stage of the two-stage compressor 1, so as to further reduce the temperature of the refrigerant entering the high compression stage and reduce the exhaust temperature of the high pressure outlet of the two-stage compressor 1, so that the exhaust temperature of the high pressure outlet of the two-stage compressor 1 is prevented from exceeding the protection limit to stop the two-stage compressor 1. Meanwhile, the power consumption and the energy efficiency ratio of the two-stage compressor 1 can be reduced, and the heating performance of the air conditioning unit is improved.
It should be noted that although the detailed steps of the control method of the air conditioning unit in the embodiment are described in detail above, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention, and therefore, the steps also fall into the protection scope of the present invention. For example, in the present embodiment, the operation of obtaining the target outlet water temperature and the actual outlet water temperature of the water flow channel may be performed simultaneously, or the target outlet water temperature of the water flow channel may be obtained first, and then the actual outlet water temperature may be obtained.
It should be understood by those skilled in the art that the control method of the air conditioning unit provided in the present embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. An air conditioning unit is characterized in that a compressor, an air-cooled heat exchanger, an electronic expansion valve and a water-cooled heat exchanger are arranged on a refrigerant circulating pipeline of the air conditioning unit;
the water-cooled heat exchanger comprises a plurality of heat exchange units, and each heat exchange unit comprises a refrigerant channel and a water flow channel which exchange heat with each other;
the second end of the refrigerant channel of one heat exchange unit in the plurality of heat exchange units is connected with the first end of the refrigerant channel of the next heat exchange unit through a first series pipeline; the first ends of the refrigerant channels of the heat exchange units are connected to the first end of the first shunt pipe, and the second ends of the refrigerant channels of the heat exchange units are connected to the first end of the first collecting pipe; a first on-off valve is arranged between the first end of the refrigerant channel which is simultaneously connected with the first shunt pipe and the first series pipeline and the first shunt pipe, and a second on-off valve is also arranged between the second end of the refrigerant channel which is simultaneously connected with the first collecting pipe and the first series pipeline and the first collecting pipe;
a second series pipeline is arranged between the second end of the water flow channel of one heat exchange unit in the plurality of heat exchange units and the first end of the water flow channel of the next heat exchange unit; the first ends of the water flow channels of the heat exchange units are connected to the first end of the second shunt pipe, and the second ends of the water flow channels of the heat exchange units are connected to the first end of the second collecting pipe; a third breaking valve is arranged between the first end of the water flow channel which is simultaneously connected with the second shunt pipe and the second series pipeline and the second shunt pipe, and a fourth breaking valve is also arranged between the second end of the water flow channel which is simultaneously connected with the second collecting pipe and the second series pipeline and the second collecting pipe;
and the control unit in the air conditioning unit is set to selectively open or close the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve simultaneously according to the target outlet water temperature of the water flow channel.
2. The air conditioning unit of claim 1, further comprising a first three-way valve, a second three-way valve, a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve;
the compressor is a two-stage compressor, the two-stage compressor is provided with a low-pressure cavity and a high-pressure cavity, and the two-stage compressor is provided with a low-pressure inlet and a low-pressure outlet which are communicated with the low-pressure cavity, and a high-pressure inlet and a high-pressure outlet which are communicated with the high-pressure cavity;
the refrigerant circulating pipeline of the air conditioning unit comprises a refrigerating circulating pipeline and a heating circulating pipeline;
the first end of the first three-way valve is communicated with a high-pressure outlet of the two-stage compressor, and the first end of the second three-way valve is communicated with a low-pressure inlet of the two-stage compressor;
in the refrigeration cycle pipeline, a second end of the first three-way valve is communicated with a first end of the air-cooled heat exchanger, a second end of the air-cooled heat exchanger is communicated with an inlet end of the first one-way valve, an outlet end of the first one-way valve is communicated with an inlet end of the electronic expansion valve, an outlet end of the electronic expansion valve is communicated with an inlet end of the second one-way valve, an outlet end of the second one-way valve is communicated with a flow dividing pipe of the water-cooled heat exchanger, and a collecting pipe of the water-cooled heat exchanger is communicated with a second end of the second three-way valve;
in the heating circulation pipeline, a third end of the first three-way valve is communicated with a first collecting pipe of the water-cooling heat exchanger, a shunt pipe of the water-cooling heat exchanger is communicated with an inlet end of a third one-way valve, an outlet end of the third one-way valve is communicated with an inlet end of the electronic expansion valve, an outlet end of the electronic expansion valve is communicated with an inlet end of a fourth one-way valve, an outlet end of the fourth one-way valve is communicated with a second end of the air-cooling heat exchanger, and a first shunt pipe of the air-cooling heat exchanger is communicated with a third end of the second three-way valve;
the control unit in the air conditioning unit is also configured to selectively conduct one of the refrigeration cycle line and the heating cycle line according to the demand for cooling or heating.
3. The air conditioning assembly as set forth in claim 2, further comprising an intercooler;
the inlet end of the intercooler is communicated with the low-pressure outlet of the two-stage compressor, and the outlet end of the intercooler is communicated with the high-pressure inlet of the two-stage compressor.
4. The air conditioning assembly as set forth in claim 3, further comprising a third three-way valve;
a first end of the third three-way valve is communicated with a low-pressure outlet of the two-stage compressor; a second end of the third three-way valve is communicated with an outlet end of the intercooler and a high-pressure inlet of the two-stage compressor; the third end of the third three-way valve is communicated with the inlet end of the intercooler;
the control unit in the air conditioning unit is further configured to selectively communicate the first end of the third three-way valve with the second end or the third end thereof according to an outdoor ambient temperature.
5. The air conditioning assembly as set forth in claim 4 wherein said intercooler is disposed to share a heat rejection blower with said air cooled heat exchanger;
the control unit in the air conditioning unit is further configured to adjust the air speed of the cooling fan according to the actual outlet water temperature of the water flow channel.
6. The control method of the air conditioning unit is characterized in that a compressor, an air-cooled heat exchanger, an electronic expansion valve and a water-cooled heat exchanger are arranged on a refrigerant circulating pipeline of the air conditioning unit;
the water-cooled heat exchanger comprises a plurality of heat exchange units, and each heat exchange unit comprises a refrigerant channel and a water flow channel which exchange heat with each other;
the second end of the refrigerant channel of one heat exchange unit in the plurality of heat exchange units is connected with the first end of the refrigerant channel of the next heat exchange unit through a first series pipeline; the first ends of the refrigerant channels of the heat exchange units are connected to the first end of the first shunt pipe, and the second ends of the refrigerant channels of the heat exchange units are connected to the first end of the first collecting pipe; a first on-off valve is arranged between the first end of the refrigerant channel which is simultaneously connected with the first shunt pipe and the first series pipeline and the first shunt pipe, and a second on-off valve is also arranged between the second end of the refrigerant channel which is simultaneously connected with the first collecting pipe and the first series pipeline and the first collecting pipe;
a second series pipeline is arranged between the second end of the water flow channel of one heat exchange unit in the plurality of heat exchange units and the first end of the water flow channel of the next heat exchange unit; the first ends of the water flow channels of the heat exchange units are connected to the first end of the second shunt pipe, and the second ends of the water flow channels of the heat exchange units are connected to the first end of the second collecting pipe; a third breaking valve is arranged between the first end of the water flow channel which is simultaneously connected with the second shunt pipe and the second series pipeline and the second shunt pipe, and a fourth breaking valve is also arranged between the second end of the water flow channel which is simultaneously connected with the second collecting pipe and the second series pipeline and the second collecting pipe; the control method comprises the following steps:
acquiring a target outlet water temperature of the water flow channel;
and selectively opening or closing the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve according to the target outlet water temperature.
7. The control method according to claim 6, wherein the step of selectively opening or closing the first on-off valve, the second on-off valve, the third on-off valve, and the fourth on-off valve according to the target outlet water temperature comprises:
in the case where the air conditioning unit is heating,
if the target outlet water temperature is greater than or equal to a preset first temperature threshold, closing the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve;
if the target outlet water temperature is less than or equal to a preset second temperature threshold, opening the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve;
wherein the first temperature threshold is greater than the second temperature threshold.
8. The control method according to claim 6, characterized by further comprising:
acquiring the actual outlet water temperature of the water flow channel;
under the heating condition, if the actual effluent temperature is lower than the target effluent temperature, increasing the operating frequency or the exhaust pressure of the compressor;
and under the refrigeration condition, if the actual outlet water temperature is higher than the target outlet water temperature, increasing the operating frequency or the exhaust pressure of the compressor.
9. The control method according to claim 6, characterized by further comprising:
acquiring the actual outlet water temperature of the water flow channel;
under the heating condition, if the actual outlet water temperature is lower than the target outlet water temperature, increasing the wind speed of a heat dissipation fan configured for the air-cooled heat exchanger;
and under the refrigeration condition, if the actual outlet water temperature is higher than the target outlet water temperature, increasing the wind speed of a heat dissipation fan configured on the air-cooled heat exchanger.
10. The control method according to claim 6, characterized by further comprising:
acquiring actual outdoor environment temperature under a heating condition; when the actual outdoor environment temperature is greater than a preset outdoor environment temperature threshold value, conducting a low-pressure outlet and a high-pressure inlet of the compressor; when the actual outdoor environment temperature is less than or equal to a preset outdoor environment temperature threshold value, communicating a low-pressure outlet of the compressor with an inlet end of the intercooler, and communicating an outlet end of the intercooler with a high-pressure inlet of the compressor; or
Acquiring an actual low-pressure exhaust temperature of a low-pressure outlet of the compressor under a heating condition; when the actual low-pressure exhaust temperature is smaller than a preset exhaust temperature threshold value, conducting a low-pressure outlet and a high-pressure inlet of the compressor; when the actual low-pressure exhaust temperature is greater than or equal to a preset exhaust temperature threshold value, communicating a low-pressure outlet of the compressor with an inlet end of an intercooler, and communicating an outlet end of the intercooler with a high-pressure inlet of the compressor; or
Acquiring the actual high-pressure exhaust temperature of a high-pressure outlet of the compressor under the heating condition; and when the difference value between the actual high-pressure exhaust temperature and the compressor exhaust temperature protection value is less than or equal to the preset safe temperature difference, communicating a low-pressure outlet of the compressor with an inlet end of the intercooler, and communicating an outlet end of the intercooler with a high-pressure inlet of the compressor.
CN202010878442.1A 2020-08-27 2020-08-27 Air conditioning unit and control method thereof Active CN114110833B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202010878442.1A CN114110833B (en) 2020-08-27 2020-08-27 Air conditioning unit and control method thereof
PCT/CN2021/092650 WO2021228018A1 (en) 2020-08-27 2021-05-10 Air conditioning unit and control method therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010878442.1A CN114110833B (en) 2020-08-27 2020-08-27 Air conditioning unit and control method thereof

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