WO2022127126A1 - Procédé et appareil de réglage et de commande pour détendeur électronique, et dispositif de pompe à chaleur - Google Patents

Procédé et appareil de réglage et de commande pour détendeur électronique, et dispositif de pompe à chaleur Download PDF

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Publication number
WO2022127126A1
WO2022127126A1 PCT/CN2021/109742 CN2021109742W WO2022127126A1 WO 2022127126 A1 WO2022127126 A1 WO 2022127126A1 CN 2021109742 W CN2021109742 W CN 2021109742W WO 2022127126 A1 WO2022127126 A1 WO 2022127126A1
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Prior art keywords
current
opening degree
expansion valve
electronic expansion
compressor
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PCT/CN2021/109742
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English (en)
Chinese (zh)
Inventor
张治平
罗炽亮
张丙
赵明智
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珠海格力电器股份有限公司
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Publication of WO2022127126A1 publication Critical patent/WO2022127126A1/fr

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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

Definitions

  • the present disclosure belongs to the technical field of electronic expansion valve regulation and control, and in particular relates to a regulation method, device and heat pump equipment of an electronic expansion valve.
  • the heat pump unit can adjust the flow of refrigerant through the electronic expansion valve.
  • the electronic expansion valve controls the flow of refrigerant entering the evaporator, which determines the amount of refrigerant entering the compressor.
  • the precise opening control of the electronic expansion valve can fully exert the energy efficiency of the compressor, improve the system performance and ensure the stable operation of the unit.
  • control methods such as terminal temperature difference and superheat degree are adopted, which are based on the control of the electronic expansion valve to adjust when the operating state of the unit reaches a set value, which belongs to the threshold comparison control method.
  • a set value which belongs to the threshold comparison control method.
  • the present disclosure provides a control method, device and heat pump equipment for an electronic expansion valve, which help to improve the control stability of the electronic expansion valve and shorten the control and stability time of the refrigerant system.
  • the present disclosure provides a method for regulating an electronic expansion valve, the method comprising:
  • the current best opening fitting coefficient is obtained
  • the current optimum opening degree is obtained;
  • the current opening degree of the electronic expansion valve is regulated according to the current optimal opening degree.
  • the method further includes:
  • the differential pressure and current current of the compressor using the differential pressure and current of the compressor under preset standard operating conditions to obtain the current best opening degree fitting coefficient, including:
  • the current current and the pressure difference of the compressor under the standard operating conditions are configured to form a proportional relationship with the current optimal opening degree fitting coefficient
  • the current The differential pressure and the current of the compressor under the standard operating conditions are configured to form an inverse relationship with the current best opening degree fitting coefficient
  • the opening fitting coefficient model includes:
  • Y is the current best opening fitting coefficient
  • ⁇ P x is the current differential pressure
  • I x is the current current
  • ⁇ P 0 is the differential pressure of the compressor under the standard operating conditions
  • I 0 is the current of the compressor under the standard operating condition.
  • the method further includes:
  • the relationship between the opening degree of the electronic expansion valve, the pressure difference of the compressor and the refrigerant flow rate, and the use of the refrigerant flow rate, the cooling capacity and the compressor The relationship between the three currents is obtained to obtain the opening fitting coefficient model;
  • the relationship between the opening of the electronic expansion valve, the pressure difference of the compressor and the refrigerant flow is: the opening of the electronic expansion valve is proportional to the refrigerant flow, and the opening of the electronic expansion valve is inversely proportional to the pressure difference of the compressor;
  • the relationship between the refrigerant flow, the cooling capacity and the compressor current is that the refrigerant flow, the cooling capacity and the compressor current are proportional to each other.
  • the relationship among the opening of the electronic expansion valve, the compressor pressure difference and the refrigerant flow is configured as:
  • K is the opening of the electronic expansion valve
  • q m is the refrigerant flow rate
  • ⁇ P is the compressor pressure difference
  • k is a constant
  • ⁇ is the refrigerant density.
  • the current optimal opening degree is obtained by using the optimal opening degree of the electronic expansion valve under the standard operating conditions according to the current optimal opening degree fitting coefficient, including:
  • K' is the current optimal opening degree
  • Y is the fitting coefficient of the current optimal opening degree
  • K 0 is the optimal opening degree of the electronic expansion valve under the standard operating conditions.
  • the present disclosure provides an adjustment and control device for an electronic expansion valve, comprising:
  • the first obtaining module is used to obtain the current best opening fitting coefficient according to the current pressure difference and current current of the compressor, using the pressure difference and current of the compressor under the preset standard operating conditions;
  • the second obtaining module is configured to obtain the current optimal opening degree by using the optimal opening degree of the electronic expansion valve under the standard operating condition according to the current optimal opening degree fitting coefficient;
  • a regulation module configured to regulate the current opening degree of the electronic expansion valve according to the current optimal opening degree.
  • the present disclosure provides a heat pump device, including
  • the heat pump device includes an air conditioner, a heat pump water heater, or a heat pump refrigerator.
  • the present disclosure adopts the above technical solutions, and at least has the following beneficial effects:
  • the pressure difference and current of the compressor under the preset standard operating conditions are used to obtain the current optimal opening degree fitting coefficient, and then the electronic expansion under the preset standard operating conditions is used.
  • the optimal opening degree of the valve, combined with the fitting coefficient of the current optimal opening degree can obtain the current optimal opening degree, so as to control the current opening degree of the electronic expansion valve, which can realize real-time precise control, and can overcome the threshold comparison control method.
  • the electronic expansion valve After the electronic expansion valve is actuated, it may cause secondary interference to the system, resulting in unbalanced regulation and the unit enters the regulation state again and increases the regulation and stabilization time of the system, so that the present disclosure can help improve regulation stability of the electronic expansion valve and shorten the refrigerant system. Control stabilization time.
  • FIG. 1 is a flowchart of a method for regulating an electronic expansion valve according to an exemplary embodiment
  • FIG. 2 is a schematic structural diagram of an electronic expansion valve adjustment and control device according to an exemplary embodiment
  • Fig. 3 is a schematic structural diagram of a heat pump device according to an exemplary embodiment. .
  • FIG. 1 is a flowchart of a method for regulating an electronic expansion valve according to an exemplary embodiment. As shown in FIG. 1, the method for regulating an electronic expansion valve includes the following steps:
  • Step S101 according to the current differential pressure and current current of the compressor, and using the differential pressure and current of the compressor under preset standard operating conditions to obtain the current optimum opening degree fitting coefficient;
  • Step S102 obtaining the current optimal opening degree by using the optimal opening degree of the electronic expansion valve under standard operating conditions according to the current optimal opening degree fitting coefficient;
  • Step S103 adjusting the current opening degree of the electronic expansion valve according to the current optimum opening degree.
  • control methods such as terminal temperature difference and superheat degree are adopted in the related art, which is based on the control of the electronic expansion valve when the operating state of the unit reaches a set value, which belongs to the threshold comparison control method.
  • a set value which belongs to the threshold comparison control method.
  • the electronic expansion valve is triggered and controlled.
  • the adjustment range of the electronic expansion valve is relatively large, so that the electronic expansion valve may cause secondary disturbance to the system after the action, which may cause the unit to enter the control state again.
  • the present disclosure belongs to a non-threshold comparison control method.
  • the present disclosure uses the differential pressure and current of the compressor under the preset standard operating conditions to obtain the current optimal opening degree fitting coefficient, and then Using the optimal opening degree of the electronic expansion valve under the preset standard working conditions, combined with the current optimal opening degree fitting coefficient, the current optimal opening degree is obtained, so as to adjust the current opening degree of the electronic expansion valve, and adjust the current opening degree to the current opening degree. Adjusting to the current optimum opening degree can realize real-time precise control, which is helpful to improve the control stability of the electronic expansion valve and shorten the control and stability time of the refrigerant system.
  • the secondary disturbance leads to unbalanced regulation and makes the unit enter the regulation state again and increases the regulation and stabilization time of the system.
  • the standard working condition in practical application, it can be selected according to the test, and the standard working condition can be formed by specifically selecting the discharge pressure, suction pressure and compressor current of the compressor. Under the selected standard operating conditions, the pressure difference of the compressor (discharge pressure minus suction pressure) is calculated, and by adjusting the opening of the electronic expansion valve, when the cooling capacity reaches the optimum, it is recorded as the standard operating condition The optimal opening of the electronic expansion valve.
  • the method further includes:
  • the current pressure difference can be determined by subtracting the suction pressure from the exhaust pressure.
  • the control of electronic expansion valve there is a conversion from pressure to temperature control.
  • the exhaust pressure, the suction pressure and the current current are directly measured, and the current pressure difference, the exhaust pressure and the suction pressure are all pressure parameters in terms of parameter types, which belong to the same type of attributes and can avoid different
  • the conversion between the type attribute parameters can make the electronic expansion valve control more precise.
  • the current optimal opening degree fitting coefficient is obtained, including:
  • the current current and the pressure difference of the compressor under standard operating conditions are configured to form a proportional relationship with the current best opening degree fitting coefficient, and the current pressure difference and the compressor under standard operating conditions are in a proportional relationship.
  • the current is configured to be inversely proportional to the current best opening fit coefficient.
  • the influence relationship between the current pressure difference and current current of the compressor and the pressure difference and current of the compressor under standard operating conditions on the current optimal opening degree fitting coefficient is configured, Under this configuration, the obtained opening fitting coefficient can be optimized.
  • the best opening degree of the electronic expansion valve under standard operating conditions is used to obtain the current optimal opening degree, including:
  • K' is the current optimal opening degree
  • Y is the fitting coefficient of the current optimal opening degree
  • K 0 is the optimal opening degree of the electronic expansion valve under standard operating conditions.
  • K′ f(Y, K 0 )
  • the present disclosure further provides an implementation method of the opening degree fitting coefficient model.
  • the method further includes:
  • the relationship between the opening degree of the electronic expansion valve, the pressure difference of the compressor and the refrigerant flow rate, and the use of the refrigerant flow rate, the cooling capacity and the compressor The relationship between the three currents is obtained, and the fitting coefficient model of the opening degree is obtained;
  • the relationship between the opening of the electronic expansion valve, the pressure difference of the compressor and the refrigerant flow is: the opening of the electronic expansion valve is proportional to the refrigerant flow, and the opening of the electronic expansion valve is inversely proportional to the pressure difference of the compressor;
  • the relationship between the refrigerant flow, the cooling capacity and the compressor current is that the refrigerant flow, the cooling capacity and the compressor current are proportional to each other.
  • the optimal opening degree of the electronic expansion valve when the optimal cooling capacity is obtained under different working conditions can be achieved by the following methods: within the specified compressor discharge pressure and suction pressure range of the unit, and the minimum to maximum The operating current range is arranged and combined according to the principle of equal division of pressure and current value, and the optimal opening of the electronic expansion valve under different arrangements is given (by adjusting the opening of the electronic expansion valve, when the cooling capacity reaches the best, it is recorded as the work the optimal opening of the electronic expansion valve under the conditions).
  • the equal division of the fixed value it can be understood through the following example, for example, the fixed value of 1 to 10 is divided into equal parts within the fixed value range of 1 to 10, such as two equal parts, four equal parts and so on.
  • an optimal opening degree fitting coefficient can be obtained according to the relationship between the optimal opening degrees of the electronic expansion valve corresponding to the two working conditions.
  • An optimal opening fitting coefficient Y 1 can be obtained, such as:
  • the relationship between the opening of the electronic expansion valve, the compressor differential pressure and the refrigerant flow is configured as:
  • K is the opening of the electronic expansion valve
  • q m is the refrigerant flow rate
  • ⁇ P is the compressor pressure difference
  • k is a constant
  • ⁇ is the refrigerant density.
  • the electronic expansion valve opening K is proportional to the refrigerant flow q m , and the electronic expansion valve opening K is inversely proportional to the compressor pressure difference ⁇ P.
  • the refrigerant flow, cooling capacity and compressor current are proportional to each other. According to this relationship, the refrigerant flow q m can be replaced by the compressor current I to obtain:
  • I 1 is the current corresponding to q m1
  • I 2 is the current corresponding to q m2 .
  • Y is the current best opening fitting coefficient
  • ⁇ P x is the current pressure difference
  • I x is the current current
  • ⁇ P 0 is the pressure difference of the compressor under standard conditions
  • I 0 is the compression under standard conditions. machine current.
  • the discharge pressure, suction pressure and compressor current of the compressor can be specifically selected to form the standard working condition.
  • the pressure difference of the compressor is calculated, and by adjusting the opening of the electronic expansion valve, when the cooling capacity reaches the optimum, it is recorded as the optimum opening of the electronic expansion valve under the standard condition. Then, input the current differential pressure and current current to output the current best opening fitting coefficient.
  • the above obtaining process is only an exemplary illustration, and is not used to limit the opening degree fitting coefficient model of the present disclosure. It is only the opening degree fitting coefficient model of the present disclosure: the current current and the pressure difference of the compressor under standard operating conditions are It is configured to form a proportional relationship with the current best opening fitting coefficient, and the current pressure difference and the compressor current under standard operating conditions are configured to form an inverse proportional relationship with the current best opening fitting coefficient, one of the configuration relationships. specific examples.
  • FIG. 2 is a schematic structural diagram of an electronic expansion valve adjustment control device according to an exemplary embodiment. As shown in FIG. 2 , the electronic expansion valve adjustment control device 2 includes:
  • the first obtaining module 201 is used for obtaining the current optimum opening degree fitting coefficient according to the current pressure difference and current current of the compressor, using the pressure difference and current of the compressor under preset standard operating conditions;
  • the second obtaining module 202 is configured to obtain the current optimum opening degree by using the optimum opening degree of the electronic expansion valve under standard operating conditions according to the current optimum opening degree fitting coefficient;
  • the regulation module 203 is configured to regulate the current opening degree of the electronic expansion valve according to the current optimal opening degree.
  • the adjustment control device 2 of the electronic expansion valve further includes:
  • the obtaining module is used to obtain the discharge pressure and suction pressure of the compressor, obtain the current pressure difference according to the discharge pressure and suction pressure, and obtain the current current.
  • the first obtaining module 201 is specifically used for:
  • the current current and the pressure difference of the compressor under standard operating conditions are configured to form a proportional relationship with the current best opening degree fitting coefficient, and the current pressure difference and the compressor under standard operating conditions are in a proportional relationship.
  • the current is configured to be inversely proportional to the current best opening fit coefficient.
  • the degree of opening fits a coefficient model, including:
  • Y is the current best opening fitting coefficient
  • ⁇ P x is the current pressure difference
  • I x is the current current
  • ⁇ P 0 is the pressure difference of the compressor under standard conditions
  • I 0 is the compression under standard conditions. machine current.
  • the adjustment control device 2 of the electronic expansion valve further includes:
  • the third obtaining module is used to obtain the optimal opening degree of the electronic expansion valve corresponding to the optimal cooling capacity under different working conditions, using the relationship between the opening degree of the electronic expansion valve, the pressure difference of the compressor and the refrigerant flow, and using the refrigerant The relationship between the flow rate, cooling capacity and compressor current is obtained, and the fitting coefficient model of the opening degree is obtained;
  • the relationship between the opening of the electronic expansion valve, the pressure difference of the compressor and the refrigerant flow is: the opening of the electronic expansion valve is proportional to the refrigerant flow, and the opening of the electronic expansion valve is inversely proportional to the pressure difference of the compressor;
  • the relationship between the refrigerant flow, the cooling capacity and the compressor current is that the refrigerant flow, the cooling capacity and the compressor current are proportional to each other.
  • the relationship among the opening of the electronic expansion valve, the compressor pressure difference and the refrigerant flow is configured as:
  • K is the opening of the electronic expansion valve
  • q m is the refrigerant flow rate
  • ⁇ P is the compressor pressure difference
  • k is a constant
  • ⁇ is the refrigerant density.
  • the second obtaining module 202 is specifically configured to:
  • K' is the current optimal opening degree
  • Y is the fitting coefficient of the current optimal opening degree
  • K 0 is the optimal opening degree of the electronic expansion valve under standard operating conditions.
  • FIG. 3 is a schematic structural diagram of a heat pump device according to an exemplary embodiment.
  • the heat pump device 3 includes:
  • One or more processors 302 are configured to execute executable programs in the memory 301 to implement the steps of any one of the above methods.
  • the heat pump device 3 may include: an air conditioner, a heat pump water heater, a heat pump refrigerator, and the like.
  • any description of a process or method in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing a particular logical function or step of the process , and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present disclosure pertain.
  • portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof.
  • various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.
  • each functional unit in each embodiment of the present disclosure may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.
  • the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like.

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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

La présente demande concerne le domaine technique du réglage et de la commande de détendeur électronique, et concerne un procédé et un appareil de réglage et de commande pour un détendeur électronique, et un dispositif de pompe à chaleur. La présente demande comprend : en fonction d'une différence de tension actuelle et d'un courant actuel d'un compresseur, l'obtention d'un coefficient d'ajustement de degré d'ouverture optimal actuel au moyen d'une différence de tension et d'un courant du compresseur dans une condition de fonctionnement standard prédéfinie ; en fonction du présent coefficient d'ajustement de degré d'ouverture optimal, l'obtention d'un degré d'ouverture optimal actuel au moyen d'un degré d'ouverture optimal d'un détendeur électronique dans la condition de fonctionnement standard ; et le réglage du degré d'ouverture actuel du détendeur électronique en fonction du présent degré d'ouverture optimal. La présente demande est avantageuse pour améliorer la stabilité de réglage et de commande de détendeurs électroniques, et réduire le temps nécessaire à la stabilisation de systèmes frigorigènes.
PCT/CN2021/109742 2020-12-17 2021-07-30 Procédé et appareil de réglage et de commande pour détendeur électronique, et dispositif de pompe à chaleur WO2022127126A1 (fr)

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CN115585565A (zh) * 2022-12-12 2023-01-10 顿汉布什(中国)工业有限公司 一种大冷量离心机组电动节流机构的精确控制方法

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