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WO2017096752A1 - 双级压缩机的补气增焓控制方法、设备和装置 - Google Patents

双级压缩机的补气增焓控制方法、设备和装置 Download PDF

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Publication number
WO2017096752A1
WO2017096752A1 PCT/CN2016/081171 CN2016081171W WO2017096752A1 WO 2017096752 A1 WO2017096752 A1 WO 2017096752A1 CN 2016081171 W CN2016081171 W CN 2016081171W WO 2017096752 A1 WO2017096752 A1 WO 2017096752A1
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WIPO (PCT)
Prior art keywords
expansion valve
supplemental
stage compressor
opening degree
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/081171
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English (en)
French (fr)
Inventor
赵桓
沈军
谭锋
梁尤轩
李鹏飞
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.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CA3004143A priority Critical patent/CA3004143C/en
Priority to US15/775,476 priority patent/US10480835B2/en
Priority to EP16871958.1A priority patent/EP3388761B1/en
Publication of WO2017096752A1 publication Critical patent/WO2017096752A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/074—Details of compressors or related parts with multiple cylinders
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
    • 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
    • F25B2600/00—Control issues
    • F25B2600/01—Timing
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2509—Economiser valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the field of air conditioning control, and in particular to a method, a device and a device for controlling air supply and augmentation of a two-stage compressor.
  • the single-stage compression heat pump can only start normally at minus 20 degrees, and the air conditioning heat is seriously attenuated in the low temperature environment, and the heating effect cannot be It is guaranteed that the reliability of air conditioning units is also severely tested.
  • the two-stage compression system with jet boosting has higher heat generation at higher temperatures and higher energy efficiency; and the two-stage compression system can reduce the pressure ratio of the single-stage compressor and reduce the exhaust temperature. At the same time, it can improve the suction efficiency and compression efficiency, thereby improving the heating and heating efficiency.
  • a two-stage compression system with jet boosting has two or more cylinders, the two or more cylinders being divided into a high pressure stage and a low pressure stage, wherein the first stage compressor is called a low pressure cylinder for the first
  • the secondary compression is called a high pressure cylinder.
  • the principle of jet boosting is to inject gaseous refrigerant into the suction port of the compressor high pressure cylinder from the jet increase port in the middle of the compressor. The injected gaseous refrigerant will be mixed with the refrigerant discharged after being compressed by the low pressure cylinder, and then enter the high pressure cylinder. compression.
  • the control of compressor jet increase is controlled by two-way valve.
  • the two-way valve only has a switching function.
  • the compressor is running at high speed, if the two-way valve is suddenly opened, the refrigerant enters the compression from the jet expansion port in the middle of the compressor.
  • the machine is mixed with the low-pressure exhaust gas.
  • the intake of the high-pressure cylinder suddenly increases, and the exhaust of the low-pressure cylinder is also subjected to the resistance of the jet, resulting in a sudden increase in the load of the compressor, resulting in greatly reduced reliability of the compressor.
  • the operating life of the components will be affected; on the other hand, the two-way valve can not accurately control the amount of air supplied by the intermediate increase because it only has the function of the switch, so it is difficult to ensure the continuous and efficient operation of the two-stage compression system.
  • the embodiment of the invention provides a method, a device and a device for controlling the air supply and the increase of the two-stage compressor, so as to at least solve the technical problem of poor running stability of the two-stage compressor in the prior art.
  • a method for controlling air supply and increasing enthalpy of a two-stage compressor comprises: when a ventilating electronic expansion valve is required to be opened, the controller is timed Gradually increase qi The opening degree of the electronic expansion valve; after the venting electronic expansion valve is opened, the detected superheat of the two-stage compressor is obtained; and the opening degree of the supplemental electronic expansion valve is adjusted based on the superheat of the two-stage compressor, wherein, the supplemental gas expansion valve is disposed between the medium pressure liquid storage tank and the two-stage compressor, and when the opening of the supplemental gas expansion valve is not zero, the gaseous refrigerant in the medium pressure liquid storage tank is supplemented by the two-stage compressor Gas increase.
  • the controller gradually increases the opening degree of the plenum electronic expansion valve according to the timing: the controller controls the qi after the two-stage compressor is turned on and runs for the first preset time period.
  • the opening degree of the electronic expansion valve is a first preset opening degree; after the opening degree of the qi electronic expansion valve is the first preset opening degree, after the qi electronic expansion valve is operated for a second preset time period, The opening of the supplemental electronic expansion valve is increased to a second preset opening degree; in the case where the opening of the supplemental electronic expansion valve is the second preset opening degree, the third preset time of the supplemental gas expansion valve is operated After the section, the qi electronic expansion valve is fully opened.
  • obtaining the detected superheat of the two-stage compressor includes: collecting the supplemental air temperature and the supplemental pressure of the two-stage compressor; acquiring the saturation temperature corresponding to the supplemental air pressure; and the difference between the supplemental air temperature and the saturation temperature The value is used as the supplemental superheat of the two-stage compressor.
  • the opening degree of the supplemental gas expansion valve based on the supplemental superheat degree of the two-stage compressor includes: determining whether the supplemental superheat of the two-stage compressor is greater than a preset superheat degree every preset time; if the two-stage compression If the superheat of the air supply of the machine is greater than the preset superheat degree, the air supply of the two-stage compressor is judged to be liquid; if the superheat of the double-stage compressor is not greater than the preset superheat degree, the two-stage compressor is determined. The air supply does not carry liquid; according to the condition of the air supply of the two-stage compressor, the opening degree of the supplemental electronic expansion valve is adjusted.
  • adjusting the opening degree of the supplemental gas expansion valve includes: if the air supply of the two-stage compressor is filled with liquid, the current opening degree of the supplemental gas expansion valve is reduced. a preset opening degree, wherein the preset opening degree is an opening degree preset according to a full opening degree of the supplemental gas expansion valve, and the full opening degree is an opening degree when the supplemental gas expansion valve is fully opened; if the double-stage compressor is If the air supply does not carry liquid, the current opening of the supplemental electronic expansion valve is kept unchanged or the current opening is increased.
  • maintaining the current opening degree of the supplemental gas expansion valve or increasing the current opening degree includes: determining that the supplemental air superheat degree is determined twice in the case of judging that the two-stage compressor is not supplied with air. If it is greater than the preset superheat degree, respectively, the operation of reducing the current opening degree of the supplemental electronic expansion valve and maintaining the current opening degree of the supplemental electronic expansion valve is performed, and then the current opening degree of the supplemental electronic expansion valve is performed. Operation; otherwise, the operation of maintaining the current opening of the supplemental electronic expansion valve is performed.
  • a gas supplementation and augmentation control device for a two-stage compressor
  • the gas supplementation and enhancement device comprising: a supplemental gas expansion valve, disposed in the medium pressure liquid storage tank Between the two-stage compressor and the two-stage compressor; the controller is connected with the supplemental electronic expansion valve for gradually increasing the opening of the supplemental electronic expansion valve according to the timing when the gas-filling electronic expansion valve is to be opened, in the supplemental gas expansion valve After opening, obtain the supplemental superheat of the two-stage compressor.
  • the opening degree of the supplemental gas electronic expansion valve is adjusted based on the superheat degree of the two-stage compressor.
  • the air supply and gasification control device further includes: a detecting device connected to the controller for collecting the supplemental air temperature and the supplemental air pressure of the two-stage compressor; the controller comprising: a reading device connected to the detecting device, The saturation temperature corresponding to the supplemental pressure is read; the calculator is connected to the detecting device and the reading device for calculating the difference between the supplemental air temperature and the saturation temperature to obtain the supplemental superheat.
  • the detecting device further comprises: a pressure sensor disposed in the air inlet of the two-stage compressor for collecting the supplemental air pressure; and the temperature sensing package disposed at the air inlet of the two-stage compressor for collecting the supplemental air temperature.
  • the air supply and gasification control device further comprises: a four-way valve, the first end is connected with the two-stage compressor; the gas-liquid separator is connected to the second end of the four-way valve, the second end and the two-stage The compressor is connected; the outdoor heat exchanger has a first end connected to the third end of the four-way valve; the indoor heat exchanger has a first end connected to the fourth end of the four-way valve, and the second end is connected to the medium pressure liquid storage tank .
  • the air supply and gasification control device further comprises: an indoor electronic expansion valve disposed between the indoor heat exchanger and the medium pressure liquid storage tank; and an outdoor electronic expansion valve disposed in the outdoor heat exchanger and the medium pressure liquid storage tank between.
  • a gas supplementation and augmentation control device for a two-stage compressor
  • the gas supplementation and augmentation control device comprising: a control unit, configured to open a supplemental gas expansion valve When the controller gradually increases the opening degree of the supplemental gas expansion valve according to the timing; the obtaining unit is configured to obtain the detected superheat of the two-stage compressor after the supplemental gas expansion valve is opened; the adjusting unit is used for The opening degree of the supplemental gas expansion valve is adjusted based on the superheat degree of the two-stage compressor, wherein the supplemental gas expansion valve is disposed between the medium pressure liquid storage tank and the two-stage compressor, and the opening of the supplemental gas expansion valve When it is not zero, the gaseous refrigerant in the medium-pressure liquid storage tank is a double-stage compressor.
  • control unit includes: a first control module, configured to: after the two-stage compressor is turned on and operated for a first preset period of time, the controller controls the opening degree of the supplemental gas expansion valve to be a first preset opening degree;
  • the second control module is configured to open the air-filling electronic expansion valve after the second predetermined period of operation of the supplemental gas expansion valve after the opening of the supplemental electronic expansion valve is the first preset opening degree Increasing to a second preset opening degree;
  • the third control module is configured to run the third preset time period of the supplemental gas expansion valve when the opening degree of the supplemental gas expansion valve is the second preset opening degree After that, the qi electronic expansion valve is fully opened.
  • the obtaining unit comprises: an collecting module, configured to collect a supplemental air temperature and a supplemental air pressure of the two-stage compressor; an acquisition module, configured to acquire a saturation temperature corresponding to the supplemental air pressure; and a calculation module, configured to: The difference in saturation temperature is used as the supplemental superheat of the two-stage compressor.
  • the adjusting unit includes: a determining module, configured to determine, at every preset time, whether the supplemental superheat degree of the two-stage compressor is greater than a preset superheat degree; the first determining module is configured to: if the two-stage compressor is conditioned If the heat is greater than the preset degree of superheat, the air supply of the two-stage compressor is determined; the second determining module is used for the compensation of the two-stage compressor. If the superheat of the air is not greater than the preset superheat degree, it is judged that the air supply of the two-stage compressor does not have liquid; the adjustment module is used to adjust the opening of the electronic air expansion valve according to the condition of the air supply of the two-stage compressor. degree.
  • the opening degree of the supplemental gas expansion valve is gradually increased to open the supplemental gas expansion valve; after the supplemental gas expansion valve is opened, the detection is based on the two-stage The supplemental superheat of the compressor is used to adjust the opening of the supplemental electronic expansion valve.
  • the venting electronic expansion valve is gradually opened, thereby avoiding the defect that the compressor load is suddenly increased due to the sudden increase of the compressor load from the closing to the opening, and the compressor power is sharply increased due to the use of the two-way valve having only the switching function.
  • the controller adjusts the opening of the supplemental electronic expansion valve based on the superheat of the supplemental air.
  • the air supply amount of the bipolar compressor can be accurately controlled by controlling the opening degree of the supplemental gas expansion valve, and the supplement of the air supply and the increase of the two-stage compressor that cannot be controlled in the prior art can be solved.
  • the amount of gas causes a problem of poor compressor operation stability.
  • FIG. 1 is a flow chart of a method for controlling a gas supply and augmentation of a two-stage compressor according to an embodiment of the present invention
  • FIG. 2 is a flow chart of an air intake and enthalpy control method of an optional two-stage compressor according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a gas supplementation and control device for a two-stage compressor according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of an optional air-increase control device for an optional two-stage compressor according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a gas supplementation control device for a two-stage compressor according to an embodiment of the present invention.
  • an embodiment of a method of controlling air entrainment and increasing enthalpy of a two-stage compressor is provided.
  • 1 is a flow chart of a method for controlling air supply and increasing enthalpy of a two-stage compressor according to an embodiment of the present invention. As shown in FIG. 1 , the method for controlling air supply and enthalpy increase includes:
  • step S102 when the supplemental gas expansion valve needs to be opened, the controller gradually increases the opening degree of the supplemental gas expansion valve according to the timing.
  • Step S104 after the venting electronic expansion valve is opened, the detected superheat of the two-stage compressor is obtained.
  • the supplemental superheat of the two-stage compressor can be detected in real time through a pressure sensor and a temperature sensing package.
  • Step S106 adjusting the opening degree of the supplemental gas expansion valve based on the supplemental superheat degree of the two-stage compressor, wherein the supplemental gas expansion valve is disposed between the medium pressure liquid storage tank and the two-stage compressor, and the supplemental gas expansion valve When the opening degree is not zero, the gaseous refrigerant in the medium-pressure liquid storage tank is a gas supplement for the two-stage compressor.
  • the opening degree of the supplemental gas expansion valve is gradually increased to open the supplemental gas expansion valve; after the supplemental gas expansion valve is opened, the detection is based on the two-stage compression
  • the air supply superheat of the machine is used to adjust the opening of the supplemental electronic expansion valve.
  • the controller adjusts the opening of the supplemental electronic expansion valve based on the superheat of the supplemental air.
  • the air supply amount of the bipolar compressor can be accurately controlled by controlling the opening degree of the supplemental gas expansion valve, and the supplement of the air supply and the increase of the two-stage compressor that cannot be controlled in the prior art can be solved.
  • the amount of gas causes a problem of poor compressor operation stability.
  • the air-filling electronic expansion valve when the air-filling electronic expansion valve is first opened, since the opening degree of the expansion valve is gradually increased, the amount of air supplied by the air supply can be gradually increased, so that the load of the compressor is gradually increased, which also makes The power of the two-stage compressor is slowly increased, which improves the starting stability of the compressor system.
  • the air supply After the venting electronic expansion valve is opened, the air supply can be adjusted according to different operating conditions, ensuring that the two-stage compressor system can be wider. Maintaining efficient operation over the temperature range improves the operational stability of the two-stage compressor.
  • the opening degree of the qi electronic valve is further controlled based on the acquired superheat of the qi, so that the two-stage air conditioning unit is different.
  • the injection volume of the gaseous refrigerant injected into the two-stage compressor cylinder of the medium-pressure liquid storage tank can be flexibly adjusted according to the actual demand, thereby avoiding the use of the conventional solenoid valve to control the two-stage compressor system.
  • the accuracy of the control of the intermediate air volume of the two-stage compressor enhances the stability of the operation of the two-stage compressor.
  • the controller gradually increases the opening degree of the supplemental gas expansion valve according to the sequence: after the two-stage compressor is turned on and runs for the first preset time period, the controller controls the compensation
  • the opening degree of the gas electronic expansion valve is a first preset opening degree; after the opening degree of the supplemental gas expansion valve is the first preset opening degree, after the second preset time period of the supplemental gas expansion valve is operated, Increasing the opening degree of the supplemental gas expansion valve to a second preset opening degree; in the case where the opening degree of the supplemental gas expansion valve is the second preset opening degree, the third preset is operated in the supplemental gas expansion valve After the time period, the qi electronic expansion valve is fully opened.
  • the controller of the two-stage compressor can control the stepwise opening of the supplemental gas electronic expansion valve when the air supply is increased.
  • the plenum electronic expansion valve may be controlled to first open the first preset opening degree, and in the case that the opening degree is the first preset opening degree, after controlling the stable operation for the second preset time period, the plenum electronic expansion valve is controlled. Turning on a second preset opening degree, the second preset opening degree is greater than the first preset opening degree, and in the case that the opening degree is the second preset opening degree, after controlling the stable operation for the third preset time period, the control is performed. Open the plenum electronic expansion valve all.
  • the timing is gradually opened, and the opening degree is gradually increased until the plenum electronic expansion valve is fully opened, thereby reducing the load variation of the two-stage compressor and avoiding the compensation.
  • the gas-electric expansion valve suddenly opens completely, causing a sudden increase in the load caused by a large amount of gaseous refrigerant suddenly injected into the corresponding cylinder of the compressor, and the reliability is greatly reduced, prolonging the operating life of the components of the two-stage compressor, and accurately
  • the ground control of the double-stage compressor increases the amount of air supplied in the middle, ensuring the continuous and efficient operation of the two-stage compressor.
  • the first time the air-filling electronic expansion valve is opened in order to avoid the load on the two-stage compressor.
  • a large impact first opening a step (ie, the first preset opening degree described above), and stabilizing the t1 time (ie, the second preset time period described above), the supplemental gas expansion valve continues to open, and the opening degree is increased.
  • step b the second preset opening degree mentioned above
  • stably running the t2 time the third preset time period mentioned above
  • the c step is turned on, and after the stable operation t3 time, the supplemental gas expansion valve is fully opened.
  • the segment opening of the supplemental gas expansion valve is realized, wherein the steps a, b and c are the opening values of the supplemental electronic expansion valve, a ⁇ b ⁇ c.
  • obtaining the detected superheat of the two-stage compressor includes: collecting the supplemental air temperature and the supplemental pressure of the two-stage compressor; acquiring the saturation temperature corresponding to the supplemental air pressure; and adjusting the supplemental temperature and the saturation temperature The difference is used as the supplemental superheat of the two-stage compressor.
  • the controller gradually increases the qi electronic according to the timing.
  • the opening degree of the expansion valve after the venting electronic expansion valve is opened, collects the supplemental air pressure and the supplemental air temperature of the two-stage compressor through the pressure sensor and the temperature sensing package, obtains the saturation temperature corresponding to the supplemental air pressure, and supplements the qi
  • the difference between the temperature and the saturation temperature is obtained by the superheat of the two-stage compressor, and the opening of the supplemental electronic expansion valve is adjusted based on the superheat of the supplemental air.
  • real-time acquisition of the air supply temperature and the supplemental air pressure can accurately obtain the operating condition information of the two-stage compressor in real time, and obtain an accurate supplemental superheat degree, thereby realizing accurate and effective control of the supplemental gas expansion valve. Effect.
  • the inhalation temperature, the exhaust temperature, and the supplemental air temperature of the two-stage compressor can be known through the temperature sensing package, and the exhaust pressure and the supplemental air pressure of the two-stage compressor can be known through the pressure sensor, and the exhaust gas is set.
  • the temperature and the supplemental air temperature are represented by Td and Tm, respectively, and the exhaust pressure and the supplemental pressure are represented by Pd and Pm, respectively, and the saturation temperatures corresponding to the exhaust pressure and the supplemental pressure are represented by Tdc and Tmc, respectively.
  • exhaust superheat SHd Td - Tdc
  • supplementary air superheat SHm Tm - Tmc.
  • the opening degree of the supplemental gas expansion valve is adjusted based on the supplemental superheat degree of the two-stage compressor, including: determining whether the supplemental superheat degree of the two-stage compressor is greater than a preset superheat degree every preset time; If the superheat of the compressor is greater than the preset superheat degree, the air supply of the two-stage compressor is determined; if the superheat of the two-stage compressor is not greater than the preset superheat, the two-stage compressor is judged. The air supply does not carry liquid; according to the condition of the air supply of the two-stage compressor, the opening degree of the supplemental electronic expansion valve is adjusted.
  • the air supply can be supplemented by adjusting the opening degree throttle, and the electronic expansion valve can be further controlled based on the superheat degree of the supplementary air.
  • the air-enhanced and enthalpy control method can improve the performance of the system while ensuring the reliability of the compressor, especially the performance of the low-temperature heating and high-temperature cooling, and also ensure the user's comfort.
  • the controller when the supplemental gas expansion valve needs to be opened, gradually increases the opening degree of the supplemental gas expansion valve according to the timing, and obtains the detected compensation of the two-stage compressor after the supplemental gas expansion valve is opened.
  • the superheat of gas determines whether the superheat of the secondary compressor of the two-stage compressor is greater than the preset superheat degree every preset time; if the superheat of the secondary compressor is greater than the preset superheat degree, the two-stage compressor is judged If the superheat of the double-stage compressor is not greater than the preset superheat degree, it is judged that the air supply of the two-stage compressor is not liquid; according to the condition of the air supply of the two-stage compressor, the adjustment is made.
  • the opening of the qi electronic expansion valve According to the above embodiment, the air supply condition is judged according to different superheating degrees of the air supply, so that precise control of the air supply electronic expansion valve after all opening can be realized.
  • adjusting the opening degree of the supplemental gas expansion valve includes: if the air supply of the two-stage compressor is liquid, the current opening degree of the supplemental electronic expansion valve is The preset opening degree is reduced, wherein the preset opening degree is an opening degree preset according to the full opening degree of the supplemental gas expansion valve, and the full opening degree is an opening degree when the supplementary gas electronic expansion valve is fully opened; if the double-stage compressor If the air supply does not carry liquid, the current opening of the supplemental electronic expansion valve is kept unchanged or the current opening is increased.
  • the current opening degree of the air-maintaining electronic expansion valve in the above embodiment may be the same or the current opening degree may be increased, if it is determined that the air supply of the two-stage compressor is not liquid, if it is determined in the last two times After the air superheat degree is greater than the preset superheat degree, respectively, the operation of reducing the current opening degree of the supplemental gas expansion valve and maintaining the current opening degree of the supplemental gas expansion valve is performed, and then the current expansion of the supplemental gas expansion valve is performed. The operation of the opening degree; otherwise, the operation of maintaining the current opening degree of the supplemental electronic expansion valve is performed.
  • the air supply enhancement control method of the two-stage compressor may include the following steps:
  • step S201 the system runs.
  • the two-stage compressor performs a specific control operation of air entrainment after the system operation time T1 (ie, the first preset time period described above).
  • step S202 the supplemental gas expansion valve is opened in time series.
  • the controller controls the supplemental gas expansion valve to be opened in time sequence, and may first open the first preset opening degree and operate the second preset opening degree.
  • the preset time period is increased by the opening degree to the second preset opening degree
  • the third preset time period is operated by the second preset opening degree, and so on, and the opening degree can be further increased, and then the increased After running for a period of time under the opening degree, until the supplemental electronic expansion valve is fully opened.
  • step S203 it is determined whether or not the air is supplied with air.
  • the superheat of the qi can be used as a criterion for determining whether the qi is liquid or not. If the heat is greater than the preset superheat degree, the air supply of the two-stage compressor is judged to be liquid; if the superheat of the double-stage compressor is not greater than the preset superheat degree, it is judged that the double-stage compressor is not supplied with liquid.
  • the specific calculation method of the supplementary air superheat degree has been described in the above embodiment, and details are not described herein again.
  • step S204 is performed, and if the result of the determination is that the air is supplied, the step S205 is performed.
  • step S204 the current opening degree is maintained.
  • Step S203 is performed, wherein when the first type of judgment (ie, the operation performed in step S203) is performed without air, the current opening degree is maintained, and then the interval T1 is detected once every interval.
  • the first type of judgment ie, the operation performed in step S203
  • step S205 the opening degree is decreased by the preset opening degree.
  • the control reduces the opening degree of the supplemental gas expansion valve by a preset opening degree, and the preset opening degree may be For a full opening of one third, after a period of time T2, a second type of qi-filled liquid determination (ie, the operation performed in step S206) is performed, wherein the full opening degree corresponds to when the qi electronic expansion valve is fully opened. Opening.
  • step S206 it is determined whether or not the air is supplied with air.
  • step S205 that is, controlling the opening degree of the supplemental electronic expansion valve to decrease the preset opening degree (for example, one third of the full opening degree), and reducing the preset opening degree (ie, reducing In the case where the opening degree after the small opening is two-thirds of the full opening degree, after running for a period of time T2, it is possible to continue climbing whether or not the air is supplied with the air. If it is judged that the air is not supplied with liquid, step S207 is performed; When the qi liquid is discharged, step S208 is performed.
  • step S207 the current opening degree is maintained.
  • step S206 when the judgment result of the second type of judgment (ie, step S206) is that the qi does not carry liquid, the current opening degree is maintained, and after a period of time T2, the third type of qi and liquid is judged, that is, the execution is continued. Step S209.
  • step S208 the opening degree is decreased by the preset opening degree.
  • the air supply is liquid, that is, when the second type determines the air supply (ie, the operation performed in step S206).
  • the opening degree is further reduced by the preset opening degree (for example, one third of the full opening degree), and after a period of time T2, the process returns to step S206, and the second type of air supply is continued. Judgment (ie, the operation performed in step S206).
  • step S208 the opening degree is reduced to 1/3 of the full opening degree, and the process returns to step S205; if the step S205 is performed, When the opening degree becomes 1/3 of the full opening degree, after the execution of step S208, the opening degree is reduced to 0, and at this time, the supplemental gas expansion valve is completely closed, the control is ended, and the other steps are not continued.
  • step S209 it is determined again whether or not the air is supplied with air.
  • step S210 it is determined again whether the air is supplied with air, that is, the third type of air supply is judged. If the result of the third type of judgment is that the air is not supplied with liquid, step S210 is performed, and then the first type of air supply belt is entered. The liquid is judged (i.e., the operation performed in step S203); if it is determined that the air supply is liquid, step S211 is performed, and then the second type of air supply liquid determination (i.e., the operation performed in step S206) is entered.
  • step S210 the opening degree is increased by a preset opening degree.
  • the opening degree of the plenum electronic expansion valve is increased by a preset opening degree, and the preset opening degree may be one third of the full opening degree, after performing step S210 Go back to step S203.
  • step S211 the opening degree is decreased by the preset opening degree.
  • the opening of the supplemental electronic expansion valve is controlled to decrease the preset opening degree (for example, one third of the full opening degree), and then the process returns to step S205.
  • the throttling action of the plenum electronic expansion valve that is, the throttling of the liquid refrigerant through the electronic expansion valve, can be changed to a gaseous refrigerant or a gas-liquid two-phase state.
  • the opening degree instead of simply closing the air supply valve.
  • it can ensure that the performance of the unit is not greatly affected when the air volume is adjusted to a small extent.
  • the air supplementation control device includes a supplemental gas expansion valve 20 and a controller 40.
  • the supplemental gas expansion valve 20 is disposed between the medium pressure liquid storage tank and the two-stage compressor; the controller 40 is connected with the supplemental gas expansion valve for timing when the gas supplemental electronic expansion valve is to be opened Gradually increase the opening degree of the supplemental electronic expansion valve. After the supplemental electronic expansion valve is opened, the superheat of the double-stage compressor is obtained, and the opening of the supplemental electronic expansion valve is adjusted based on the superheat of the two-stage compressor. .
  • the opening degree of the supplemental gas expansion valve is gradually increased to open the supplemental gas expansion valve; after the supplemental gas expansion valve is opened, the detection is based on the two-stage compression
  • the air supply superheat of the machine is used to adjust the opening of the supplemental electronic expansion valve.
  • the controller adjusts the opening of the supplemental electronic expansion valve based on the superheat of the supplemental air.
  • the air supply amount of the bipolar compressor can be accurately controlled by controlling the opening degree of the supplemental gas expansion valve, and the supplement of the air supply and the increase of the two-stage compressor that cannot be controlled in the prior art can be solved.
  • the amount of gas causes a problem of poor compressor operation stability.
  • the air supplementation control device further includes: a detecting device connected to the controller, configured to collect a supplemental air temperature and a supplemental air pressure of the two-stage compressor; and the controller includes: a reading device connected to the detecting device, It is used to read the saturation temperature corresponding to the supplemental pressure; the calculator is connected with the detecting device and the reading device for calculating the difference between the supplemental air temperature and the saturation temperature to obtain the supplemental superheat.
  • a detecting device connected to the controller, configured to collect a supplemental air temperature and a supplemental air pressure of the two-stage compressor
  • the controller includes: a reading device connected to the detecting device, It is used to read the saturation temperature corresponding to the supplemental pressure; the calculator is connected with the detecting device and the reading device for calculating the difference between the supplemental air temperature and the saturation temperature to obtain the supplemental superheat.
  • the detecting device further includes: a pressure sensor disposed in the air inlet of the two-stage compressor for collecting the air supply pressure; and a temperature sensing package disposed at the air inlet of the two-stage compressor for collecting the air supply temperature.
  • the gas supplementation control device further comprises: a four-way valve, the first end is connected with the two-stage compressor; the gas-liquid separator, the first end is connected with the second end of the four-way valve, and the second end is double Stage compressor connection; outdoor heat exchanger, first end is connected with third end of four-way valve; indoor heat exchanger, first end is connected with fourth end of four-way valve, second end is connected with medium pressure liquid storage tank connection.
  • the gas supplementing and controlling device further comprises: an indoor electronic expansion valve disposed between the indoor heat exchanger and the medium pressure liquid storage tank; the outdoor electronic expansion valve is disposed in the outdoor heat exchanger and the medium pressure liquid storage tank between.
  • the air-filling and increasing control device may include: an air-filling electronic expansion valve 20, a medium-pressure liquid storage tank 30, a controller, a medium-pressure sensor 50, a gas-liquid separator 60, and an indoor heat exchanger 70.
  • a controller may be included in the stage compressor 10.
  • the medium pressure sensor 50 is a pressure sensor disposed at the air inlet of the two-stage air conditioning system, and the air supply pressure can be detected, and the supplemental electronic expansion valve 20 can control the medium pressure liquid storage tank 30 based on the supplemental superheat degree (also known as The gaseous refrigerant in the flasher is injected into the cylinder corresponding to the two-stage compressor (which may be a high-pressure cylinder), and the gas-liquid separator 60 can perform the gaseous refrigerant discharged from the two-stage compressor when the four-way valve 90 is turned on.
  • the supplemental superheat degree also known as The gaseous refrigerant in the flasher is injected into the cylinder corresponding to the two-stage compressor (which may be a high-pressure cylinder)
  • the gas-liquid separator 60 can perform the gaseous refrigerant discharged from the two-stage compressor when the four-way valve 90 is turned on.
  • the gas-liquid separation, the four-way valve 90 can control the conduction state of the indoor heat exchanger 70 and the outdoor heat exchanger 80 and the two-stage compressor 10, and the indoor unit electronic expansion valve 71 can control the indoor heat exchanger 70 and the medium-pressure liquid storage.
  • the conduction state of the canister 30, similarly, the main electronic expansion valve 81 can control the communication state of the outdoor heat exchanger 80 and the intermediate pressure reservoir tank 30.
  • the throttling action of the plenum electronic expansion valve that is, the throttling of the liquid refrigerant through the electronic expansion valve, can be changed to a gaseous refrigerant or a gas-liquid two-phase state.
  • the opening degree instead of simply closing the air supply valve.
  • it can ensure that the performance of the unit is not greatly affected when the air volume is adjusted to a small extent.
  • the gas supplementation control device includes: a control unit 51, an acquisition unit 52, and an adjustment. Unit 53.
  • the control unit 51 is configured to gradually increase the opening degree of the supplemental gas expansion valve according to the timing when the supplemental gas expansion valve needs to be opened; and the obtaining unit 52 is configured to acquire the detection after the supplemental gas expansion valve is opened.
  • the supplementary air superheat degree of the two-stage compressor; the adjusting unit 53 is configured to adjust the opening degree of the supplementary gas electronic expansion valve based on the supplementary air superheat degree of the two-stage compressor, wherein the supplementary gas electronic expansion valve is set in the medium pressure storage
  • the gaseous refrigerant in the medium-pressure liquid storage tank is a gas supplement for the two-stage compressor.
  • the opening degree of the supplemental gas expansion valve is gradually increased to open the supplemental gas expansion valve; after the supplemental gas expansion valve is opened, the detection is based on the two-stage compression
  • the air supply superheat of the machine is used to adjust the opening of the supplemental electronic expansion valve.
  • the controller is based on the superheat of the supplement
  • the air supply of the bipolar compressor can be accurately controlled by controlling the opening degree of the supplemental electronic expansion valve, thereby solving the problem in the prior art. Controlling the amount of air supplied by the two-stage compressor to increase the air supply, resulting in poor operation stability of the compressor.
  • control unit includes: a first control module, configured to: after the two-stage compressor is turned on and operated for a first preset period of time, the controller controls the opening degree of the supplemental gas expansion valve to be a first preset opening degree; a second control module, configured to open the supplemental gas expansion valve after the second predetermined period of operation of the supplemental gas expansion valve after the opening of the supplemental electronic expansion valve is the first preset opening degree The degree is increased to a second preset opening degree; the third control module is configured to run the third preset time of the supplemental gas expansion valve when the opening degree of the supplemental gas expansion valve is the second preset opening degree After the section, the qi electronic expansion valve is fully opened.
  • a first control module configured to: after the two-stage compressor is turned on and operated for a first preset period of time, the controller controls the opening degree of the supplemental gas expansion valve to be a first preset opening degree
  • a second control module configured to open the supplemental gas expansion valve after the second predetermined period of operation of the supplemental gas expansion valve
  • the controller of the two-stage compressor can control the stepwise opening of the supplemental gas electronic expansion valve when the air supply is increased.
  • the plenum electronic expansion valve may be controlled to first open the first preset opening degree, and in the case that the opening degree is the first preset opening degree, after controlling the stable operation for the second preset time period, the plenum electronic expansion valve is controlled. Turning on a second preset opening degree, the second preset opening degree is greater than the first preset opening degree, and in the case that the opening degree is the second preset opening degree, after controlling the stable operation for the third preset time period, the control is performed. Open the plenum electronic expansion valve all.
  • the timing is gradually opened, and the opening degree is gradually increased until the plenum electronic expansion valve is fully opened, thereby reducing the load variation of the two-stage compressor and avoiding the compensation.
  • the gas-electric expansion valve suddenly opens completely, causing a sudden increase in the load caused by a large amount of gaseous refrigerant suddenly injected into the corresponding cylinder of the compressor, and the reliability is greatly reduced, prolonging the operating life of the components of the two-stage compressor, and accurately
  • the ground control of the double-stage compressor increases the amount of air supplied in the middle, ensuring the continuous and efficient operation of the two-stage compressor.
  • the acquiring unit comprises: an collecting module, configured to collect a supplemental air temperature and a supplemental air pressure of the two-stage compressor; an acquisition module, configured to acquire a saturation temperature corresponding to the supplemental air pressure; and a calculation module, configured to use the supplemental air temperature The difference from the saturation temperature is used as the supplemental superheat of the two-stage compressor.
  • the controller gradually increases the opening degree of the qi electronic expansion valve according to the timing, and after the qi electronic expansion valve is opened, the pressure sensor and the temperature sensing package are used to collect the double
  • the supplemental pressure and the supplemental air temperature of the stage compressor obtain the saturation temperature corresponding to the supplemental pressure, and the difference between the supplemental air temperature and the saturation temperature is obtained to obtain the supplemental superheat of the two-stage compressor, and based on the supplemental superheat degree. Adjust the opening of the qi electronic expansion valve.
  • real-time acquisition of the air supply temperature and the supplemental air pressure can accurately obtain the operating condition information of the two-stage compressor in real time, and obtain an accurate supplemental superheat degree, thereby realizing accurate and effective control of the supplemental gas expansion valve. Effect.
  • the adjusting unit includes: a determining module, configured to determine, at every preset time, whether the supplemental superheat of the two-stage compressor is greater than a preset superheat degree; and the first determining module is configured to be used for the plenum of the two-stage compressor If the superheat degree is greater than the preset superheat degree, the air supply of the two-stage compressor is determined to be liquid; and the second determining module is used for the air supply of the two-stage compressor.
  • a determining module configured to determine, at every preset time, whether the supplemental superheat of the two-stage compressor is greater than a preset superheat degree
  • the first determining module is configured to be used for the plenum of the two-stage compressor If the superheat degree is greater than the preset superheat degree, the air supply of the two-stage compressor is determined to be liquid; and the second determining module is used for the air supply of the two-stage compressor.
  • the adjustment module is used for adjusting the opening degree of the supplemental gas expansion valve according to the condition of the air supply of the two-stage compressor. .
  • the air supply can be supplemented by adjusting the opening degree throttle, and the electronic expansion valve can be further controlled based on the superheat degree of the supplementary air.
  • the air-enhanced and enthalpy control method can improve the performance of the system while ensuring the reliability of the compressor, especially the performance of the low-temperature heating and high-temperature cooling, and also ensure the user's comfort.
  • the disclosed technical contents may be implemented in other manners.
  • the device embodiments described above are only schematic.
  • the division of the unit may be a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, unit or module, and may be electrical or otherwise.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

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Abstract

一种双级压缩机(10)的补气增焓控制方法、设备和装置，该补气增焓控制方法包括：在需开启补气电子膨胀阀(20)时，控制器(40)按时序逐步增加补气电子膨胀阀(20)的开度；在补气电子膨胀阀(20)开启之后，获取检测到的双级压缩机(10)的补气过热度；基于双级压缩机(10)的补气过热度调整补气电子膨胀阀(20)的开度，其中，补气电子膨胀阀(20)设置在中压储液罐(30)和双级压缩机(10)之间，补气电子膨胀阀(20)的开度不为零时，中压储液罐(30)中的气态冷媒为双级压缩机(10)补气增焓，解决了现有技术中双级压缩机的运行稳定性差的问题。

Description

双级压缩机的补气增焓控制方法、设备和装置 技术领域
本发明涉及空调控制领域，具体而言，涉及一种双级压缩机的补气增焓控制方法、设备和装置。
背景技术
环境温度越低，对空调制热量的需求越大，目前单级压缩的热泵只能做到在零下20度的情况下正常启动运行，且在低温环境下空调制热量严重衰减，制热效果不能得以保证，空调机组的可靠性也受到严峻的考验。
相比于单级压缩热泵，带有喷气增焓的双级压缩系统在低温下制热量较大，能效较高；且双级压缩系统能减少单级压缩机的压比，能够降低排气温度，同时可提高吸气效率和压缩效率，从而提升制热量和制热效率。
带有喷气增焓的双级压缩系统具有两个或以上的气缸，该两个或以上的气缸分为高压级和低压级，其中用于第一级压缩机的称为低压缸，用于第二级压缩的称为高压缸。喷气增焓的原理是从压缩机中部的喷气增焓口将气态冷媒喷入压缩机高压缸的吸气口，喷入的气态冷媒将与经过低压缸压缩后排出的冷媒混合，然后进入高压缸压缩。
目前对压缩机喷气增焓的控制均采用二通阀控制，二通阀只具有开关作用，当压缩机高速运转时，若突然打开二通阀使冷媒从压缩机中部的喷气增焓口进入压缩机与低压级排气混合，高压缸的吸气量陡然增大，而且低压缸的排气也受到喷气的阻力，导致压缩机负载突然增大，导致压缩机可靠性大大降低，压缩机中的零部件的运行寿命的将受到影响；另一方面，二通阀由于只具有开关的作用，无法精确控制中间增焓的补气量，因此也难以保证双级压缩系统持续高效运行。
针对现有技术中无法控制双级压缩机的补气增焓的补气量，导致压缩机运行稳定性差的问题，目前尚未提出有效的解决方案。
发明内容
本发明实施例提供了一种双级压缩机的补气增焓控制方法、设备和装置，以至少解决现有技术中双级压缩机的运行稳定性差的技术问题。
根据本发明实施例的第一个方面，提供了一种双级压缩机的补气增焓控制方法，该补气增焓控制方法包括：在需开启补气电子膨胀阀时，控制器按时序逐步增加补气 电子膨胀阀的开度；在补气电子膨胀阀开启之后，获取检测到的双级压缩机的补气过热度；基于双级压缩机的补气过热度调整补气电子膨胀阀的开度，其中，补气电子膨胀阀设置在中压储液罐和双级压缩机之间，补气电子膨胀阀的开度不为零时，中压储液罐中的气态冷媒为双级压缩机补气增焓。
进一步地，在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子膨胀阀的开度包括：在双级压缩机开启并运行第一预设时间段之后，控制器控制补气电子膨胀阀的开度为第一预设开度；在补气电子膨胀阀的开度为第一预设开度的情况下，在补气电子膨胀阀运行第二预设时间段后，将补气电子膨胀阀的开度增大至第二预设开度；在补气电子膨胀阀的开度为第二预设开度的情况下，在补气电子膨胀阀运行第三预设时间段后，将补气电子膨胀阀全部打开。
进一步地，获取检测到的双级压缩机的补气过热度包括：采集双级压缩机的补气温度和补气压力；获取补气压力对应的饱和温度；将补气温度与饱和温度的差值作为双级压缩机的补气过热度。
进一步地，基于双级压缩机的补气过热度调整补气电子膨胀阀的开度包括：每隔预设时间判断双级压缩机的补气过热度是否大于预设过热度；若双级压缩机的补气过热度大于预设过热度，则判断出双级压缩机的补气带液；若双级压缩机的补气过热度不大于预设过热度，则判断出双级压缩机的补气不带液；根据双级压缩机的补气带液的情况，调整补气电子膨胀阀的开度。
进一步地，根据双级压缩机的补气带液的情况，调整补气电子膨胀阀的开度包括：若双级压缩机的补气带液，则将补气电子膨胀阀的当前开度缩小预设开度，其中，预设开度为基于补气电子膨胀阀的全开度预先设置的开度，全开度为补气电子膨胀阀全部开启时的开度；若双级压缩机的补气不带液，则保持补气电子膨胀阀的当前开度不变或者增大当前开度。
进一步地，保持补气电子膨胀阀的当前开度不变或者增大当前开度包括：在判断出双级压缩机的补气不带液的情况下，若在上两次判断补气过热度是否大于预设过热度后，分别执行了减小补气电子膨胀阀的当前开度和保持补气电子膨胀阀的当前开度的操作，则执行增大补气电子膨胀阀的当前开度的操作；否则，则执行保持补气电子膨胀阀的当前开度的操作。
根据本发明实施例的第二个方面，还提供了一种双级压缩机的补气增焓控制设备，该补气增焓控制设备包括：补气电子膨胀阀，设置在中压储液罐和双级压缩机之间；控制器，与补气电子膨胀阀连接，用于在需开启补气电子膨胀阀时，按时序逐步增加补气电子膨胀阀的开度，在补气电子膨胀阀开启之后，获取双级压缩机的补气过热度， 基于双级压缩机的补气过热度调整补气电子膨胀阀的开度。
进一步地，补气增焓控制设备还包括：检测装置，与控制器连接，用于采集双级压缩机的补气温度和补气压力；控制器包括：读取装置，与检测装置连接，用于读取与补气压力对应的饱和温度；计算器，与检测装置和读取装置连接，用于计算补气温度和饱和温度的差值，得到补气过热度。
进一步地，检测装置还包括：压力传感器，设置在双级压缩机的补气口，用于采集补气压力；感温包，设置在双级压缩机的补气口，用于采集补气温度。
进一步地，补气增焓控制设备还包括：四通阀，第一端与双级压缩机连接；气液分离器，第一端与四通阀的第二端连接，第二端与双级压缩机连接；室外换热器，第一端与四通阀的第三端连接；室内换热器，第一端与四通阀的第四端连接，第二端与中压储液罐连接。
进一步地，补气增焓控制设备还包括：室内电子膨胀阀，设置于室内换热器和中压储液罐之间；室外电子膨胀阀，设置于室外换热器和中压储液罐之间。
根据本发明实施例的第三个方面，还提供了一种双级压缩机的补气增焓控制装置，该补气增焓控制装置包括：控制单元，用于在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子膨胀阀的开度；获取单元，用于在补气电子膨胀阀开启之后，获取检测到的双级压缩机的补气过热度；调整单元，用于基于双级压缩机的补气过热度调整补气电子膨胀阀的开度，其中，补气电子膨胀阀设置在中压储液罐和双级压缩机之间，补气电子膨胀阀的开度不为零时，中压储液罐中的气态冷媒为双级压缩机补气增焓。
进一步地，控制单元包括：第一控制模块，用于在双级压缩机开启并运行第一预设时间段之后，控制器控制补气电子膨胀阀的开度为第一预设开度；第二控制模块，用于在补气电子膨胀阀的开度为第一预设开度的情况下，在补气电子膨胀阀运行第二预设时间段后，将补气电子膨胀阀的开度增大至第二预设开度；第三控制模块，用于在补气电子膨胀阀的开度为第二预设开度的情况下，在补气电子膨胀阀运行第三预设时间段后，将补气电子膨胀阀全部打开。
进一步地，获取单元包括：采集模块，用于采集双级压缩机的补气温度和补气压力；获取模块，用于获取补气压力对应的饱和温度；计算模块，用于将补气温度与饱和温度的差值作为双级压缩机的补气过热度。
进一步地，调整单元包括：判断模块，用于每隔预设时间判断双级压缩机的补气过热度是否大于预设过热度；第一确定模块，用于若双级压缩机的补气过热度大于预设过热度，则判断出双级压缩机的补气带液；第二确定模块，用于若双级压缩机的补 气过热度不大于预设过热度，则判断出双级压缩机的补气不带液；调整模块，用于根据双级压缩机的补气带液的情况，调整补气电子膨胀阀的开度。
在本发明实施例中，当需要开启补气电子膨胀阀时，逐步增加补气电子膨胀阀的开度，以打开补气电子膨胀阀；在补气电子膨胀阀开启之后，基于检测的双级压缩机的补气过热度来调整补气电子膨胀阀的开度。通过上述实施例，逐步打开补气电子膨胀阀，避免了采用只具有开关作用的二通阀补气时，因阀门从关到开使得压缩机负载突然增大，压缩机功率急剧提高的缺陷，消除了采用补气电磁阀对压缩机运行稳定性和可靠性的不良影响，并且在补气电子膨胀阀全部打开之后，控制器基于补气过热度来调整补气电子膨胀阀的开度，在上述实施例中，可以通过控制补气电子膨胀阀的开度准确控制对双极压缩机补气增焓的补气量，解决了现有技术中无法控制双级压缩机的补气增焓的补气量，导致压缩机运行稳定性差的问题。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是根据本发明实施例的一种双级压缩机的补气增焓控制方法的流程图；
图2是根据本发明实施例的一种可选的双级压缩机的补气增焓控制方法的流程图；
图3是根据本发明实施例的一种双级压缩机的补气增焓控制设备的示意图；
图4是根据本发明实施例的一种可选的双级压缩机的补气增焓控制设备的示意图；以及
图5是根据本发明实施例的一种双级压缩机的补气增焓控制装置的示意图。
具体实施方式
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第 二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本发明的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
根据本发明实施例，提供了一种双级压缩机的补气增焓控制方法的实施例。图1是根据本发明实施例的一种双级压缩机的补气增焓控制方法的流程图，如图1所示，该补气增焓控制方法包括：
步骤S102，在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子膨胀阀的开度。
步骤S104，在补气电子膨胀阀开启之后，获取检测到的双级压缩机的补气过热度。
具体地，可以通过压力传感器和感温包实时检测该双级压缩机的补气过热度。
步骤S106，基于双级压缩机的补气过热度调整补气电子膨胀阀的开度，其中，补气电子膨胀阀设置在中压储液罐和双级压缩机之间，补气电子膨胀阀的开度不为零时，中压储液罐中的气态冷媒为双级压缩机补气增焓。
采用本发明实施例，当需要开启补气电子膨胀阀时，逐步增加补气电子膨胀阀的开度，以打开补气电子膨胀阀；在补气电子膨胀阀开启之后，基于检测的双级压缩机的补气过热度来调整补气电子膨胀阀的开度。通过上述实施例，逐步打开补气电子膨胀阀，避免了采用只具有开关作用的二通阀补气时，因阀门从关到开使得压缩机负载突然增大，压缩机功率急剧提高的缺陷，消除了采用补气电磁阀对压缩机运行稳定性和可靠性的不良影响，并且在补气电子膨胀阀全部打开之后，控制器基于补气过热度来调整补气电子膨胀阀的开度，在上述实施例中，可以通过控制补气电子膨胀阀的开度准确控制对双极压缩机补气增焓的补气量，解决了现有技术中无法控制双级压缩机的补气增焓的补气量，导致压缩机运行稳定性差的问题。
在上述实施例中，在首次打开补气电子膨胀阀时，由于逐步增加该膨胀阀的开度，可以使得补气增焓的补气量逐步增大，使得压缩机的负载逐步增大，也使得双级压缩机的功率缓慢上升，提高了压缩机系统的启动稳定性；在开启补气电子膨胀阀之后，可以按照不同运行工况调整补气量，确保了双级压缩机系统可以在较宽的温度范围内维持高效运行，提高了双级压缩机的运行稳定性。
进一步地，通过控制补气电子阀按时序逐步打开，并在完全开启后，基于实时获取到的补气过热度来进一步对补气电子阀的开度进行控制，使得双级空调机组在不同 的运行工况下，可以根据实际需求来灵活地调整中压储液罐的气态冷媒喷入双级压缩机气缸的喷入量，避免了采用传统的电磁阀来控制双级压缩机系统时无法控制中间补气量的缺陷，并且也避免了使用电磁阀在补气带液时必须关闭补气阀，而导致的增焓时有时无，机组性能受到影响，舒适性较差的现象，提高了对双级压缩机的中间补气量的控制的精确度，增强了双级压缩机运行的稳定性。
可选地，在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子膨胀阀的开度包括：在双级压缩机开启并运行第一预设时间段之后，控制器控制补气电子膨胀阀的开度为第一预设开度；在补气电子膨胀阀的开度为第一预设开度的情况下，在补气电子膨胀阀运行第二预设时间段后，将补气电子膨胀阀的开度增大至第二预设开度；在补气电子膨胀阀的开度为第二预设开度的情况下，在补气电子膨胀阀运行第三预设时间段后，将补气电子膨胀阀全部打开。
在上述实施例中，双级压缩机在开启并运行第一预设时间段后，该双级压缩机的控制器可以在需要补气增焓时，控制按时序逐步开启补气电子膨胀阀，可以控制该补气电子膨胀阀先开启第一预设开度，并在开度为第一预设开度的情况下，控制稳定运行第二预设时间段后，控制该补气电子膨胀阀开启第二预设开度，该第二预设开度大于第一预设开度，并在开度为第二预设开度的情况下，控制稳定运行第三预设时间段后，控制全部打开该补气电子膨胀阀。通过上述实施例，控制补气电子膨胀阀在需要开启时，按时序逐步开启，逐渐增大开度，直至补气电子膨胀阀完全打开，减缓了双级压缩机的负载变化量，避免了补气电子膨胀阀突然全部打开，使大量气态冷媒突然喷入压缩机的相应的气缸所导致的负载突然增大，可靠性大大降低的缺陷，延长了双级压缩机的零部件的运行寿命，精确地控制了双级压缩机的中间增焓的补气量，保证了双级压缩机持续高效地与运行。
具体地，当双级压缩机的机组启动并稳定运行5min(即上述的第一预设时间段)后第一次控制开启补气电子膨胀阀，为避免对该双级压缩机的负载造成过大的冲击，首先开启a步(即上述的第一预设开度)，并稳定t1时间(即上述的第二预设时间段)后，补气电子膨胀阀继续开大，开度增大至b步(上述的第二预设开度)，并稳定运行t2时间(上述的第三预设时间段)后，然后开启c步，稳定运行t3时间后，补气电子膨胀阀全部打开，实现了对补气电子膨胀阀的分段开启，其中，a步、b步以及c步为补气电子膨胀阀的开度数值，a<b<c。
可选地，获取检测到的双级压缩机的补气过热度包括：采集双级压缩机的补气温度和补气压力；获取补气压力对应的饱和温度；将补气温度与饱和温度的差值作为双级压缩机的补气过热度。
在上述实施例中，在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子 膨胀阀的开度，在补气电子膨胀阀开启之后，通过压力传感器和感温包来采集双级压缩机的补气压力和补气温度，获取补气压力对应的饱和温度，并将补气温度与饱和温度作差得到双级压缩机的补气过热度，再基于该补气过热度调整补气电子膨胀阀的开度。通过上述实施例，实时获取补气温度和补气压力，可以实时准确地获取双级压缩机的运行工况信息，得到准确的补气过热度，从而实现对补气电子膨胀阀准确有效的控制的效果。
具体地，通过感温包可以得知双级压缩机的吸气温度、排气温度和补气温度，通过压力传感器可以得知双级压缩机的排气压力和补气压力，设定排气温度和补气温度分别用Td和Tm表示，排气压力和补气压力分别用Pd和Pm表示，排气压力和补气压力对应的饱和温度分别用Tdc和Tmc表示。则：排气过热度SHd＝Td-Tdc；补气过热度SHm＝Tm-Tmc。
可选地，基于双级压缩机的补气过热度调整补气电子膨胀阀的开度包括：每隔预设时间判断双级压缩机的补气过热度是否大于预设过热度；若双级压缩机的补气过热度大于预设过热度，则判断出双级压缩机的补气带液；若双级压缩机的补气过热度不大于预设过热度，则判断出双级压缩机的补气不带液；根据双级压缩机的补气带液的情况，调整补气电子膨胀阀的开度。
在上述实施例中，基于电子膨胀阀的节流作用，即使在补气带液时，也可通过调节开度节流进行补气，基于补气过热度来进一步控制电子膨胀阀。该补气增焓控制方法可以实现在保障压缩机可靠性的同时，提高系统运行的性能，尤其提高低温制热和高温制冷的性能的效果，也确保了用户的舒适性。
在上述实施例中，在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子膨胀阀的开度，在补气电子膨胀阀开启之后，获取检测到的双级压缩机的补气过热度，每隔预设时间判断双级压缩机的补气过热度是否大于预设过热度；若双级压缩机的补气过热度大于预设过热度，则判断出双级压缩机的补气带液；若双级压缩机的补气过热度不大于预设过热度，则判断出双级压缩机的补气不带液；根据双级压缩机的补气带液的情况，调整补气电子膨胀阀的开度。通过上述实施例，根据不同的补气过热度来判断补气带液情况，从而可以实现对全部打开后的补气电子膨胀阀的精确的控制。
可选地，根据双级压缩机的补气带液的情况，调整补气电子膨胀阀的开度包括：若双级压缩机的补气带液，则将补气电子膨胀阀的当前开度缩小预设开度，其中，预设开度为基于补气电子膨胀阀的全开度预先设置的开度，全开度为补气电子膨胀阀全部开启时的开度；若双级压缩机的补气不带液，则保持补气电子膨胀阀的当前开度不变或者增大当前开度。
上述实施例中的保持补气电子膨胀阀的当前开度不变或者增大当前开度可以包括：在判断出双级压缩机的补气不带液的情况下，若在上两次判断补气过热度是否大于预设过热度后，分别执行了减小补气电子膨胀阀的当前开度和保持补气电子膨胀阀的当前开度的操作，则执行增大补气电子膨胀阀的当前开度的操作；否则，则执行保持补气电子膨胀阀的当前开度的操作。
下面结合具体图2对上述实施例进行介绍。
具体地，如图2所示，该双级压缩机的补气增焓控制方法可以包括如下步骤：
步骤S201，系统运行。
具体地，双级压缩机在系统运行时间T1(即上述的第一预设时间段)后，进行补气增焓的具体控制操作。
步骤S202，补气电子膨胀阀按时序打开。
具体地，在双级压缩机运行第一预设时间段后，控制器控制补气电子膨胀阀按时序打开，可以先开启第一预设开度，在第一预设开度下运行第二预设时间段，在增加开度至第二预设开度，在第二预设开度下运行第三预设时间段，以此类推，也可以再将开度继续增加，再增加后的开度下运行一段时间后，直至该补气电子膨胀阀全部打开。
步骤S203，判断是否补气带液。
具体地，在补气电子膨胀阀按时序全部打开并稳定运行一段时间(如T1)后，可以通过补气过热度来作为判断补气是否带液的标准，若双级压缩机的补气过热度大于预设过热度，则判断出双级压缩机的补气带液；若双级压缩机的补气过热度不大于预设过热度，则判断出双级压缩机的补气不带液，其中，补气过热度具体计算方法在上述实施例中已经说明，在此不再赘述。
若判断结果为补气不带液，则执行步骤S204，若判断结果为补气带液，则执行步骤S205。
步骤S204，保持当前开度。
具体地，在判断出补气不带液，即由补气电子膨胀阀控制喷出的气态冷媒中不带有液态的冷媒，则控制补气电子膨胀阀保持当前的开度不变，然后返回执行步骤S203，其中，当第一类判断(即步骤S203执行的操作)补气不带液时，则保持目前开度，之后每间隔一段时间T1检测一次。
步骤S205，开度减小预设开度。
具体地，当第一类判断(即步骤S203执行的操作)的判断结果为补气带液时，则控制将补气电子膨胀阀的开度减小预设开度，该预设开度可以为三分之一的全开度，间隔一段时间T2后，进行第二类补气带液判断(即步骤S206执行的操作)，其中，全开度为补气电子膨胀阀完全打开时所对应的开度。
步骤S206，判断是否补气带液。
具体地，在执行完步骤S205之后，即在控制补气电子膨胀阀的开度减小预设开度(如全开度的三分之一)，并在减小预设开度(即减小后的开度为全开度的三分之二)的情况下，运行一段时间T2后，可以继续攀登是否补气带液，若判断出补气不带液，则执行步骤S207；若判断出补气带液，则执行步骤S208。
步骤S207，保持当前开度。
具体地，当第二类判断(即步骤S206)的判断结果为补气不带液时，则保持当前的开度，间隔一段时间T2后，进行第三类补气带液判断，即继续执行步骤S209。
步骤S208，开度减小预设开度。
具体地，在执行步骤S205开度减小预设开度(如全开度的三分之一)之后，判断出补气带液，即当第二类判断补气(即步骤S206执行的操作)为带液时，则将开度再减小预设开度(如全开度的三分之一)，间隔一段时间T2后，返回执行步骤S206，即继续进行第二类补气带液判断(即步骤S206执行的操作)。若执行步骤S205之后，开度变为全开度的2/3，则执行完步骤S208之后，开度将减小为全开度的1/3，返回执行步骤S205；若执行步骤S205之后，开度变为全开度的1/3，则执行完步骤S208之后，开度将减小为0，此时补气电子膨胀阀完全关闭，结束控制，不再继续执行其他步骤。
步骤S209，再次判断是否补气带液。
具体地，再次判断是否补气带液，即进行第三类补气带液的判断，若第三类判断的结果为补气不带液，则执行步骤S210，然后进入第一类补气带液判断(即步骤S203执行的操作)；若判断出补气带液，则执行步骤S211，然后进入第二类补气带液判断(即步骤S206执行的操作)。
步骤S210，开度增加预设开度。
具体地，若判断出补气不带液，则控制补气电子膨胀阀的开度增加预设开度，该预设开度可以为全开度的三分之一，在执行完步骤S210之后，返回执行步骤S203。
步骤S211，开度减小预设开度。
具体地，若判断出补气带液，则控制补气电子膨胀阀开度减小预设开度(如全开度的三分之一)，然后返回执行步骤S205。
通过上述实施例，基于补气电子膨胀阀的节流作用，即液态冷媒经过电子膨胀阀的节流可以变为气态冷媒或者气液两相状态。即使在补气带液的情况下，也可以通过调小开度而不是单纯的关闭补气阀来精确控制补气量，一方面可以确保机组性能在调小补气量时不受到较大影响，确保机组性能，尤其低温制热和高温制冷时候的舒适性；另一方面，通过减小补气流量，可以确保压缩机的稳定性。
根据本发明实施例，还提供了一种双级压缩机的补气增焓控制设备的实施例。如图3所示，该补气增焓控制设备包括：补气电子膨胀阀20和控制器40。
其中，补气电子膨胀阀20，设置在中压储液罐和双级压缩机之间；控制器40，与补气电子膨胀阀连接，用于在需开启补气电子膨胀阀时，按时序逐步增加补气电子膨胀阀的开度，在补气电子膨胀阀开启之后，获取双级压缩机的补气过热度，基于双级压缩机的补气过热度调整补气电子膨胀阀的开度。
采用本发明实施例，当需要开启补气电子膨胀阀时，逐步增加补气电子膨胀阀的开度，以打开补气电子膨胀阀；在补气电子膨胀阀开启之后，基于检测的双级压缩机的补气过热度来调整补气电子膨胀阀的开度。通过上述实施例，逐步打开补气电子膨胀阀，避免了采用只具有开关作用的二通阀补气时，因阀门从关到开使得压缩机负载突然增大，压缩机功率急剧提高的缺陷，消除了采用补气电磁阀对压缩机运行稳定性和可靠性的不良影响，并且在补气电子膨胀阀全部打开之后，控制器基于补气过热度来调整补气电子膨胀阀的开度，在上述实施例中，可以通过控制补气电子膨胀阀的开度准确控制对双极压缩机补气增焓的补气量，解决了现有技术中无法控制双级压缩机的补气增焓的补气量，导致压缩机运行稳定性差的问题。
可选地，补气增焓控制设备还包括：检测装置，与控制器连接，用于采集双级压缩机的补气温度和补气压力；控制器包括：读取装置，与检测装置连接，用于读取与补气压力对应的饱和温度；计算器，与检测装置和读取装置连接，用于计算补气温度和饱和温度的差值，得到补气过热度。
可选地，检测装置还包括：压力传感器，设置在双级压缩机的补气口，用于采集补气压力；感温包，设置在双级压缩机的补气口，用于采集补气温度。
可选地，补气增焓控制设备还包括：四通阀，第一端与双级压缩机连接；气液分离器，第一端与四通阀的第二端连接，第二端与双级压缩机连接；室外换热器，第一端与四通阀的第三端连接；室内换热器，第一端与四通阀的第四端连接，第二端与中压储液罐连接。
可选地，补气增焓控制设备还包括：室内电子膨胀阀，设置于室内换热器和中压储液罐之间；室外电子膨胀阀，设置于室外换热器和中压储液罐之间。
下面结合图4对补气增焓控制设备进行详细的说明。
如图4所示，该补气增焓控制设备可以包括：补气电子膨胀阀20、中压储液罐30、控制器、中压传感器50、气液分离器60、室内换热器70，室内机电子膨胀阀71、室外换热器80、主电子膨胀阀81以及四通阀90，其中，控制器未在图4中示出，图4中仅示出了双级压缩机10，双级压缩机10中可以包括控制器。
具体地，中压传感器50为设置在双级空调系统补气口处的压力传感器，可以检测到补气压力，补气电子膨胀阀20可以基于补气过热度控制中压储液罐30(又名，闪发器)中的气态冷媒喷入双级压缩机对应的气缸(可以为高压气缸)，气液分离器60可以在四通阀90导通时，对双级压缩机排出的气态冷媒进行气液分离，四通阀90可以控制室内换热器70和室外换热器80与双级压缩机10的导通状态，室内机电子膨胀阀71可以控制室内换热器70与中压储液罐30的导通状态，同样，主电子膨胀阀81可以控制室外换热器80与中压储液罐30的联通状态。
通过上述实施例，基于补气电子膨胀阀的节流作用，即液态冷媒经过电子膨胀阀的节流可以变为气态冷媒或者气液两相状态。即使在补气带液的情况下，也可以通过调小开度而不是单纯的关闭补气阀来精确控制补气量，一方面可以确保机组性能在调小补气量时不受到较大影响，确保机组性能，尤其低温制热和高温制冷时候的舒适性；另一方面，通过减小补气流量，可以确保双级压缩机的稳定性。
根据本发明实施例，还提供了一种双级压缩机的补气增焓控制装置的实施例，如图5所示，该补气增焓控制装置包括：控制单元51、获取单元52以及调整单元53。
其中，控制单元51，用于在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子膨胀阀的开度；获取单元52，用于在补气电子膨胀阀开启之后，获取检测到的双级压缩机的补气过热度；调整单元53，用于基于双级压缩机的补气过热度调整补气电子膨胀阀的开度，其中，补气电子膨胀阀设置在中压储液罐和双级压缩机之间，补气电子膨胀阀的开度不为零时，中压储液罐中的气态冷媒为双级压缩机补气增焓。
采用本发明实施例，当需要开启补气电子膨胀阀时，逐步增加补气电子膨胀阀的开度，以打开补气电子膨胀阀；在补气电子膨胀阀开启之后，基于检测的双级压缩机的补气过热度来调整补气电子膨胀阀的开度。通过上述实施例，逐步打开补气电子膨胀阀，避免了采用只具有开关作用的二通阀补气时，因阀门从关到开使得压缩机负载突然增大，压缩机功率急剧提高的缺陷，消除了采用补气电磁阀对压缩机运行稳定性和可靠性的不良影响，并且在补气电子膨胀阀全部打开之后，控制器基于补气过热度 来调整补气电子膨胀阀的开度，在上述实施例中，可以通过控制补气电子膨胀阀的开度准确控制对双极压缩机补气增焓的补气量，解决了现有技术中无法控制双级压缩机的补气增焓的补气量，导致压缩机运行稳定性差的问题。
可选地，控制单元包括：第一控制模块，用于在双级压缩机开启并运行第一预设时间段之后，控制器控制补气电子膨胀阀的开度为第一预设开度；第二控制模块，用于在补气电子膨胀阀的开度为第一预设开度的情况下，在补气电子膨胀阀运行第二预设时间段后，将补气电子膨胀阀的开度增大至第二预设开度；第三控制模块，用于在补气电子膨胀阀的开度为第二预设开度的情况下，在补气电子膨胀阀运行第三预设时间段后，将补气电子膨胀阀全部打开。
在上述实施例中，双级压缩机在开启并运行第一预设时间段后，该双级压缩机的控制器可以在需要补气增焓时，控制按时序逐步开启补气电子膨胀阀，可以控制该补气电子膨胀阀先开启第一预设开度，并在开度为第一预设开度的情况下，控制稳定运行第二预设时间段后，控制该补气电子膨胀阀开启第二预设开度，该第二预设开度大于第一预设开度，并在开度为第二预设开度的情况下，控制稳定运行第三预设时间段后，控制全部打开该补气电子膨胀阀。通过上述实施例，控制补气电子膨胀阀在需要开启时，按时序逐步开启，逐渐增大开度，直至补气电子膨胀阀完全打开，减缓了双级压缩机的负载变化量，避免了补气电子膨胀阀突然全部打开，使大量气态冷媒突然喷入压缩机的相应的气缸所导致的负载突然增大，可靠性大大降低的缺陷，延长了双级压缩机的零部件的运行寿命，精确地控制了双级压缩机的中间增焓的补气量，保证了双级压缩机持续高效地与运行。
可选地，获取单元包括：采集模块，用于采集双级压缩机的补气温度和补气压力；获取模块，用于获取补气压力对应的饱和温度；计算模块，用于将补气温度与饱和温度的差值作为双级压缩机的补气过热度。
在上述实施例中，在需开启补气电子膨胀阀时，控制器按时序逐步增加补气电子膨胀阀的开度，在补气电子膨胀阀开启之后，通过压力传感器和感温包来采集双级压缩机的补气压力和补气温度，获取补气压力对应的饱和温度，并将补气温度与饱和温度作差得到双级压缩机的补气过热度，在再基于该补气过热度调整补气电子膨胀阀的开度。通过上述实施例，实时获取补气温度和补气压力，可以实时准确地获取双级压缩机的运行工况信息，得到准确的补气过热度，从而实现对补气电子膨胀阀准确有效的控制的效果。
可选地，调整单元包括：判断模块，用于每隔预设时间判断双级压缩机的补气过热度是否大于预设过热度；第一确定模块，用于若双级压缩机的补气过热度大于预设过热度，则判断出双级压缩机的补气带液；第二确定模块，用于若双级压缩机的补气 过热度不大于预设过热度，则判断出双级压缩机的补气不带液；调整模块，用于根据双级压缩机的补气带液的情况，调整补气电子膨胀阀的开度。
在上述实施例中，基于电子膨胀阀的节流作用，即使在补气带液时，也可通过调节开度节流进行补气，基于补气过热度来进一步控制电子膨胀阀。该补气增焓控制方法可以实现在保障压缩机可靠性的同时，提高系统运行的性能，尤其提高低温制热和高温制冷的性能的效果，也确保了用户的舒适性。
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。
在本发明的上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
在本申请所提供的几个实施例中，应该理解到，所揭露的技术内容，可通过其它的方式实现。其中，以上所描述的装置实施例仅仅是示意性的，例如所述单元的划分，可以为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，单元或模块的间接耦合或通信连接，可以是电性或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (15)

  1. 一种双级压缩机的补气增焓控制方法，包括：
    在需开启补气电子膨胀阀时，控制器按时序逐步增加所述补气电子膨胀阀的开度；
    在所述补气电子膨胀阀开启之后，获取检测到的双级压缩机的补气过热度；
    基于所述双级压缩机的补气过热度调整所述补气电子膨胀阀的开度，
    其中，所述补气电子膨胀阀设置在中压储液罐和所述双级压缩机之间，所述补气电子膨胀阀的开度不为零时，所述中压储液罐中的气态冷媒为所述双级压缩机补气增焓。
  2. 根据权利要求1所述的补气增焓控制方法，其中，在需开启补气电子膨胀阀时，控制器按时序逐步增加所述补气电子膨胀阀的开度包括：
    在所述双级压缩机开启并运行第一预设时间段之后，所述控制器控制所述补气电子膨胀阀的开度为第一预设开度；
    在所述补气电子膨胀阀的开度为所述第一预设开度的情况下，在所述补气电子膨胀阀运行第二预设时间段后，将所述补气电子膨胀阀的开度增大至第二预设开度；
    在所述补气电子膨胀阀的开度为所述第二预设开度的情况下，在所述补气电子膨胀阀运行第三预设时间段后，将所述补气电子膨胀阀全部打开。
  3. 根据权利要求1或2所述的补气增焓控制方法，其中，获取检测到的所述双级压缩机的补气过热度包括：
    采集所述双级压缩机的补气温度和补气压力；
    获取所述补气压力对应的饱和温度；
    将所述补气温度与所述饱和温度的差值作为所述双级压缩机的补气过热度。
  4. 根据权利要求3所述的补气增焓控制方法，其中，基于所述双级压缩机的补气过热度调整所述补气电子膨胀阀的开度包括：
    每隔预设时间判断所述双级压缩机的补气过热度是否大于预设过热度；
    若所述双级压缩机的补气过热度大于所述预设过热度，则判断出所述双级压缩机的补气带液；
    若所述双级压缩机的补气过热度不大于所述预设过热度，则判断出所述双级 压缩机的补气不带液；
    根据所述双级压缩机的补气带液的情况，调整所述补气电子膨胀阀的开度。
  5. 根据权利要求4所述的补气增焓控制方法，其中，根据所述双级压缩机的补气带液的情况，调整所述补气电子膨胀阀的开度包括：
    若所述双级压缩机的补气带液，则将所述补气电子膨胀阀的当前开度缩小预设开度，其中，所述预设开度为基于所述补气电子膨胀阀的全开度预先设置的开度，所述全开度为所述补气电子膨胀阀全部开启时的开度；
    若所述双级压缩机的补气不带液，则保持所述补气电子膨胀阀的当前开度不变或者增大所述当前开度。
  6. 根据权利要求5所述的补气增焓控制方法，其中，保持所述补气电子膨胀阀的当前开度不变或者增大所述当前开度包括：
    在判断出所述双级压缩机的补气不带液的情况下，
    若在上两次判断补气过热度是否大于预设过热度后，分别执行了减小所述补气电子膨胀阀的当前开度和保持所述补气电子膨胀阀的当前开度的操作，则执行增大所述补气电子膨胀阀的当前开度的操作；
    否则，则执行保持所述补气电子膨胀阀的当前开度的操作。
  7. 一种双级压缩机的补气增焓控制设备，包括：
    补气电子膨胀阀，设置在中压储液罐和双级压缩机之间；
    控制器，与所述补气电子膨胀阀连接，用于在需开启补气电子膨胀阀时，按时序逐步增加所述补气电子膨胀阀的开度，在所述补气电子膨胀阀开启之后，获取所述双级压缩机的补气过热度，基于所述双级压缩机的补气过热度调整所述补气电子膨胀阀的开度。
  8. 根据权利要求7所述的补气增焓控制设备，其中，所述补气增焓控制设备还包括：
    检测装置，与所述控制器连接，用于采集所述双级压缩机的补气温度和补气压力；
    所述控制器包括：
    读取装置，与所述检测装置连接，用于读取与所述补气压力对应的饱和温度；
    计算器，与所述检测装置和所述读取装置连接，用于计算所述补气温度和所 述饱和温度的差值，得到所述补气过热度。
  9. 根据权利要求8所述的补气增焓控制设备，其中，所述检测装置还包括：
    压力传感器，设置在所述双级压缩机的补气口，用于采集所述补气压力；
    感温包，设置在所述双级压缩机的补气口，用于采集所述补气温度。
  10. 根据权利要求7所述的补气增焓控制设备，其中，所述补气增焓控制设备还包括：
    四通阀，第一端与所述双级压缩机连接；
    气液分离器，第一端与所述四通阀的第二端连接，第二端与所述双级压缩机连接；
    室外换热器，第一端与所述四通阀的第三端连接；
    室内换热器，第一端与所述四通阀的第四端连接，第二端与所述中压储液罐连接。
  11. 根据权利要求10所述的补气增焓控制设备，其中，所述补气增焓控制设备还包括：
    室内电子膨胀阀，设置于所述室内换热器和所述中压储液罐之间；
    室外电子膨胀阀，设置于所述室外换热器和所述中压储液罐之间。
  12. 一种双级压缩机的补气增焓控制装置，包括：
    控制单元，用于在需开启补气电子膨胀阀时，控制器按时序逐步增加所述补气电子膨胀阀的开度；
    获取单元，用于在所述补气电子膨胀阀开启之后，获取检测到的所述双级压缩机的补气过热度；
    调整单元，用于基于所述双级压缩机的补气过热度调整所述补气电子膨胀阀的开度，
    其中，所述补气电子膨胀阀设置在中压储液罐和双级压缩机之间，所述补气电子膨胀阀的开度不为零时，所述中压储液罐中的气态冷媒为所述双级压缩机补气增焓。
  13. 根据权利要求12所述的补气增焓控制装置，其中，所述控制单元包括：
    第一控制模块，用于在所述双级压缩机开启并运行第一预设时间段之后，所述控制器控制所述补气电子膨胀阀的开度为第一预设开度；
    第二控制模块，用于在所述补气电子膨胀阀的开度为所述第一预设开度的情况下，在所述补气电子膨胀阀运行第二预设时间段后，将所述补气电子膨胀阀的开度增大至第二预设开度；
    第三控制模块，用于在所述补气电子膨胀阀的开度为所述第二预设开度的情况下，在所述补气电子膨胀阀运行第三预设时间段后，将所述补气电子膨胀阀全部打开。
  14. 根据权利要求12或13所述的补气增焓控制装置，其中，所述获取单元包括：
    采集模块，用于采集所述双级压缩机的补气温度和补气压力；
    获取模块，用于获取所述补气压力对应的饱和温度；
    计算模块，用于将所述补气温度与所述饱和温度的差值作为所述双级压缩机的补气过热度。
  15. 根据权利要求14所述的补气增焓控制装置，其中，所述调整单元包括：
    判断模块，用于每隔预设时间判断所述双级压缩机的补气过热度是否大于预设过热度；
    第一确定模块，用于若所述双级压缩机的补气过热度大于所述预设过热度，则判断出所述双级压缩机的补气带液；
    第二确定模块，用于若所述双级压缩机的补气过热度不大于所述预设过热度，则判断出所述双级压缩机的补气不带液；
    调整模块，用于根据所述双级压缩机的补气带液的情况，调整所述补气电子膨胀阀的开度。
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