CN115247922A - Automatic control method for preventing refrigerant of compressor from flowing back to flash tank - Google Patents

Automatic control method for preventing refrigerant of compressor from flowing back to flash tank Download PDF

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Publication number
CN115247922A
CN115247922A CN202210736586.2A CN202210736586A CN115247922A CN 115247922 A CN115247922 A CN 115247922A CN 202210736586 A CN202210736586 A CN 202210736586A CN 115247922 A CN115247922 A CN 115247922A
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China
Prior art keywords
pressure
air supply
flash tank
compressor
superheat
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Pending
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CN202210736586.2A
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Chinese (zh)
Inventor
李文健
张树前
凌拥军
叶小霞
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Zhejiang Zhongguang Electric Appliance Group Co Ltd
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Zhejiang Zhongguang Electric Appliance Group Co Ltd
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Priority to CN202210736586.2A priority Critical patent/CN115247922A/en
Publication of CN115247922A publication Critical patent/CN115247922A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an automatic control method for preventing a refrigerant of a compressor from flowing back to a flash tank, which is used for respectively performing anti-backflow control during refrigeration or heating. When the air-supplying enthalpy-increasing compressor is used for supplying air and increasing enthalpy, the refrigerant of the air-supplying enthalpy-increasing compressor is prevented from flowing back to the flash tank through the backflow prevention control to influence the performance and the reliability of the compressor, and P is enabled to be controlled through the air-supplying control Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 Make the air supply pressure of the compressor reachThe best air supply state is achieved, and the capacity and energy efficiency of the compressor are exerted to the maximum extent.

Description

Automatic control method for preventing refrigerant of compressor from flowing back to flash tank
Technical Field
The invention relates to an automatic control method for preventing a refrigerant of a compressor from flowing back to a flash tank.
Background
An Enhanced Vapor Injection (EVI) technology can improve the heating capacity and the cooling capacity of low-environment temperature, is more and more favored by customers, and a flash tank system structure is simpler than an economizer system structure, so that the flash tank system structure is further promoted by designers in recent years. Because the air supplement port of the compressor is fixed, the operating condition of the heat pump is changeable, when the heat pump enters air supplement and enthalpy increase, the pressure of the enthalpy increase of the air supplement port of the compressor is inevitably higher than the pressure of the flash tank, so that the refrigerant of the compressor flows back to the flash tank, the performance and the reliability of the unit are further influenced, and the optimal energy efficiency of the compressor cannot be exerted by the conventional air supplement and enthalpy increase.
Disclosure of Invention
In order to solve the problems, the invention provides an automatic control method for preventing the refrigerant of the compressor from flowing back to the flash tank, which effectively solves the problems pointed out in the background technology.
The technical scheme adopted by the invention is as follows:
an automatic control method for preventing a refrigerant of a compressor from flowing back to a flash tank is characterized in that anti-backflow control is respectively carried out during refrigeration or heating:
during heating, if the unit satisfies enthalpy-increasing conditions, open the air-supplementing electromagnetic valve between the compressor and the flash tank:
1) When P is Flash tank pressure ＜P Pressure of air supply When the delta P is continued for delta t, the air replenishing electromagnetic valve is closed, and the air replenishing enthalpy increasing is quitted;
2) When P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply When the pressure is minus delta P, the unit is controlled according to the target superheat degree, and the unit reaches the target exhaust superheat degree delta T 1 And target degree of suction superheat delta T 2 Then, the pressure of the flash tank still satisfies P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Δ P, then the target degree of superheat Δ T of the exhaust gas of the control system 1 Decrease the target suction superheat degree delta T 2 Keeping the system unchanged, increasing the second electronic expansion valve between the water side heat exchanger and the flash tank to a set step number, and decreasing the first electronic expansion valve between the finned heat exchanger and the flash tank to a set step number until the system exhaust superheat degree reachesBefore the lowest discharge superheat limited by the compressor, if P Flash tank pressure ＞P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 Controlling the first electronic expansion valve and the second electronic expansion valve to keep the step number unchanged, and after the system exhaust superheat reaches the lowest exhaust superheat limited by the compressor, and P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Delta P, the gas supplementing and enthalpy increasing are carried out when the unit is withdrawn;
3) When P is Flash tank pressure ＞P Pressure of air supply In time, air supply control is carried out: if P Pressure of air supply ＞k(P Suction device *P Row board ) 1/2 Controlling the superheat degree of the exhaust gas of the second electronic expansion valve to increase if P is detected Flash tank pressure ＞P Pressure of air supply And P is Pressure of air supply ＜k(P Suction device *P Row board ) 1/2 Controlling the superheat degree of the exhaust gas of the second electronic expansion valve to be reduced until P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 ；
During refrigeration, if the unit satisfies enthalpy-increasing conditions, an air-supplementing electromagnetic valve between the compressor and the flash tank is opened:
1) When P is Flash tank pressure ＜P Pressure of air supply When delta P continues for delta t, closing the air replenishing electromagnetic valve, and withdrawing air replenishing enthalpy;
2) When P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply When the pressure is minus delta P, the unit is controlled according to the target superheat degree, and the unit reaches the target exhaust superheat degree delta T 1 ' and target degree of suction superheat DeltaT 2 ' thereafter, and the pressure of the flash tank still satisfies P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply - Δ P, then the target exhaust superheat Δ T of the control system 1 ' decrease, target suction superheat Δ T 2 The method comprises the steps that a first electronic expansion valve between a finned heat exchanger and a flash tank is increased to a set step number, a second electronic expansion valve between a water side heat exchanger and the flash tank is decreased to the set step number, and if P is equal to the lowest exhaust superheat limited by a compressor before the exhaust superheat of a system reaches the lowest exhaust superheat Flash tank pressure ＞P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 Controlling the first electronic expansion valve and the second electronic expansion valve to maintain the step number unchanged, and after the system exhaust superheat reaches the lowest exhaust superheat limited by the compressor, controlling the system exhaust superheat to be P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Delta P, the gas supplementing and enthalpy increasing are carried out when the unit is withdrawn;
3) When P is Flash tank pressure ＞P Pressure of air supply In time, air supply control is carried out: if P Pressure of air supply ＞k(P Suction device *P Row board ) 1/2 Controlling the exhaust superheat degree of the first electronic expansion valve to increase if P Flash tank pressure ＞P Pressure of air supply And P is Pressure of air supply ＜k(P Suction device *P Row board ) 1/2 Controlling the exhaust superheat degree of the first electronic expansion valve to be reduced until P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 。
When the air-supplying enthalpy-increasing compressor is used for supplying air and increasing enthalpy, the refrigerant of the air-supplying enthalpy-increasing compressor is prevented from flowing back to the flash tank through the backflow prevention control to influence the performance and the reliability of the compressor, and P is enabled to be controlled through the air-supplying control Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 The air supply pressure of the compressor reaches the optimal air supply state, and the capacity and energy efficiency of the compressor are exerted to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
1. the system comprises a compressor, 2, an exhaust temperature sensing bag, 3, an exhaust pressure sensor, 4, a four-way valve, 5, a fan, 6, a finned heat exchanger, 7, a first electronic expansion valve, 8, a flash tank, 9, a flash tank pressure sensor, 10, an air supply electromagnetic valve, 11, an air supply pressure sensor, 12, an air suction temperature sensing bag, 13, a gas-liquid separator, 14, an air suction pressure sensor, 15, a second electronic expansion valve, 16, a liquid storage device, 17, a water side heat exchanger, 18, a water return pipe, 19 and a water outlet pipe.
Detailed Description
The invention is described in further detail below by means of specific embodiments in conjunction with the accompanying drawings.
Fig. 1 illustrates a schematic structural diagram of the present invention, and provides an automatic control method for preventing a refrigerant of a compressor from flowing back to a flash tank, wherein the method comprises the following steps of:
during heating, if the unit satisfies enthalpy-increasing conditions, open the air-supplementing electromagnetic valve between the compressor and the flash tank:
1) When P is Flash tank pressure ＜P Pressure of air supply When delta P continues for delta t, closing the air replenishing electromagnetic valve, and withdrawing air replenishing enthalpy;
2) When P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply When the pressure is minus delta P, the unit is controlled according to the target superheat degree, and the unit reaches the target exhaust superheat degree delta T 1 And target degree of superheat Δ T of intake air 2 Then, the pressure of the flash tank still satisfies P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Δ P, then the target degree of superheat Δ T of the exhaust gas of the control system 1 Decrease the target suction superheat degree delta T 2 Keeping the system unchanged, increasing the second electronic expansion valve between the water side heat exchanger and the flash tank to a set step number, and decreasing the first electronic expansion valve between the finned heat exchanger and the flash tank to the set step number, wherein if P is the lowest exhaust superheat limited by the compressor before the system exhaust superheat reaches the lowest exhaust superheat, the system exhaust superheat is maintained unchanged Flash tank pressure ＞P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 Controlling the first electronic expansion valve and the second electronic expansion valve to keep the step number unchanged, and after the system exhaust superheat reaches the lowest exhaust superheat limited by the compressor, and P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply - Δ P, the unit exits to supplement air and increase enthalpy;
3) When P is Flash tank pressure ＞P Pressure of air supply In time, air supply control is carried out: if P Pressure of air supply ＞k(P Suction device *P Row board ) 1/2 Controlling the exhaust superheat degree of the second electronic expansion valve to increase if P Flash tank pressure ＞P Pressure of air supply And P is Pressure of air supply ＜k(P Suction device *P Row board ) 1/2 Controlling the superheat degree of the exhaust gas of the second electronic expansion valve to be reducedUp to P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 ；
During refrigeration, if the unit satisfies enthalpy-increasing conditions, open the tonifying qi solenoid valve between compressor and flash tank:
1) When P is Flash tank pressure ＜P Pressure of air supply When the delta P is continued for delta t, the air replenishing electromagnetic valve is closed, and the air replenishing enthalpy increasing is quitted;
2) When P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply When the pressure is minus delta P, the unit is controlled according to the target superheat degree, and the unit reaches the target exhaust superheat degree delta T 1 ' and target degree of suction superheat DeltaT 2 ' thereafter, and the pressure of the flash tank still satisfies P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Δ P, then the target degree of superheat Δ T of the exhaust gas of the control system 1 ' reduction, target intake superheat degree DeltaT 2 The method comprises the steps that a first electronic expansion valve between a finned heat exchanger and a flash tank is increased to a set step number, a second electronic expansion valve between a water side heat exchanger and the flash tank is decreased to the set step number, and if P is equal to the lowest exhaust superheat limited by a compressor before the exhaust superheat of a system reaches the lowest exhaust superheat Flash tank pressure ＞P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 Controlling the first electronic expansion valve and the second electronic expansion valve to maintain the step number unchanged, and after the system exhaust superheat reaches the lowest exhaust superheat limited by the compressor, controlling the system exhaust superheat to be P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Delta P, the gas supplementing and enthalpy increasing are carried out when the unit is withdrawn;
3) When P is Flash tank pressure ＞P Pressure of air supply In time, air supply control is carried out: if P Pressure of air supply ＞k(P Suction device *P Row board ) 1/2 Controlling the exhaust superheat degree of the first electronic expansion valve to increase if P Flash tank pressure ＞P Pressure of air supply And P is Pressure of air supply ＜k(P Suction device *P Row board ) 1/2 Controlling the exhaust superheat degree of the first electronic expansion valve to be reduced until P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 。
Finally, it should be noted that the above-mentioned list is only the specific embodiment of the present invention. It is apparent that the present invention is not limited to the above embodiment, and many modifications are possible. All modifications which can be derived or suggested by the person skilled in the art from the present disclosure are to be considered within the scope of the present invention.

Claims (1)

1. An automatic control method for preventing refrigerant of a compressor from flowing back to a flash tank is characterized in that backflow prevention control is respectively carried out during refrigeration or heating:
during heating, if the unit satisfies enthalpy-increasing conditions, open the air-supplementing electromagnetic valve between the compressor and the flash tank:
1) When P is Flash tank pressure ＜P Pressure of air supply When the delta P is continued for delta t, the air replenishing electromagnetic valve is closed, and the air replenishing enthalpy increasing is quitted;
2) When P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply When the pressure is minus delta P, the unit is controlled according to the target superheat degree, and the unit reaches the target exhaust superheat degree delta T 1 And target degree of suction superheat delta T 2 Then, the pressure of the flash tank still satisfies P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Δ P, then the target degree of superheat Δ T of the exhaust gas of the control system 1 Decrease the target suction superheat degree delta T 2 Keeping the system unchanged, increasing the second electronic expansion valve between the water side heat exchanger and the flash tank to a set step number, and decreasing the first electronic expansion valve between the finned heat exchanger and the flash tank to the set step number, wherein if P is the lowest exhaust superheat limited by the compressor before the system exhaust superheat reaches the lowest exhaust superheat Flash tank pressure ＞P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 Controlling the first electronic expansion valve and the second electronic expansion valve to keep the step number unchanged, and after the system exhaust superheat reaches the lowest exhaust superheat limited by the compressor, and P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply - Δ P, the unit exits to supplement air and increase enthalpy;
3) When P is Flash tank pressure ＞P Pressure of air supply In time, air supply control is carried out: if P Pressure of air supply ＞k(P Suction device *P Row board ) 1/2 Controlling the exhaust superheat degree of the second electronic expansion valve to increase if P Flash tank pressure ＞P Pressure of air supply And P is Pressure of air supply ＜k(P Suction device *P Row board ) 1/2 Controlling the superheat degree of the exhaust gas of the second electronic expansion valve to be reduced until P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 ；
During refrigeration, if the unit satisfies enthalpy-increasing conditions, open the tonifying qi solenoid valve between compressor and flash tank:
1) When P is Flash tank pressure ＜P Pressure of air supply When delta P continues for delta t, closing the air replenishing electromagnetic valve, and withdrawing air replenishing enthalpy;
2) When P is Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply When the pressure is minus delta P, the unit is controlled according to the target superheat degree, and the unit reaches the target exhaust superheat degree delta T 1 ' and target suction superheat degree DeltaT 2 ' thereafter, and the pressure of the flash tank still satisfies P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply - Δ P, then the target exhaust superheat Δ T of the control system 1 ' reduction, target intake superheat degree DeltaT 2 The method comprises the steps that a first electronic expansion valve between a finned heat exchanger and a flash tank is increased to a set step number, a second electronic expansion valve between a water side heat exchanger and the flash tank is decreased to the set step number, and if P is equal to the lowest exhaust superheat limited by a compressor before the exhaust superheat of a system reaches the lowest exhaust superheat Flash tank pressure ＞P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 Controlling the first electronic expansion valve and the second electronic expansion valve to maintain the step number unchanged, and after the system exhaust superheat reaches the lowest exhaust superheat limited by the compressor, controlling the system exhaust superheat to be P Pressure of air supply ＞P Flash tank pressure ＞P Pressure of air supply Delta P, the gas supplementing and enthalpy increasing are carried out when the unit is withdrawn;
3) When P is Flash tank pressure ＞P Pressure of air supply In time, air supply control is carried out: if P Pressure of air supply ＞k(P Suction device *P Row board ) 1/2 Controlling the superheat degree of the exhaust gas of the first electronic expansion valve to increase if P Flash tank pressure ＞P Pressure of air supply And P is Pressure of air supply ＜k(P Suction device *P Row board ) 1/2 Controlling the exhaust superheat degree of the first electronic expansion valve to be reduced until P Pressure of air supply ＝k(P Suction device *P Row board ) 1/2 。
CN202210736586.2A 2022-06-27 2022-06-27 Automatic control method for preventing refrigerant of compressor from flowing back to flash tank Pending CN115247922A (en)

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