WO2022127126A1

WO2022127126A1 - Adjustment and control method and apparatus for electronic expansion valve, and heat pump device

Info

Publication number: WO2022127126A1
Application number: PCT/CN2021/109742
Authority: WO
Inventors: 张治平; 罗炽亮; 张丙; 赵明智
Original assignee: 珠海格力电器股份有限公司
Priority date: 2020-12-17
Filing date: 2021-07-30
Publication date: 2022-06-23
Also published as: CN112665246A; CN112665246B

Abstract

The present application relates to the technical field of electronic expansion valve adjustment and control, and relates to an adjustment and control method and apparatus for an electronic expansion valve, and a heat pump device. The present application comprises: according to a present voltage difference and a present current of a compressor, obtaining a present optimal opening degree fitting coefficient by means of a voltage difference and a current of the compressor in a preset standard working condition; according to the present optimal opening degree fitting coefficient, obtaining a present optimal opening degree by means of an optimal opening degree of an electronic expansion valve in the standard working condition; and adjusting the present opening degree of the electronic expansion valve according to the present optimal opening degree. The present application is beneficial to improving the stability of adjustment and control of electronic expansion valves, and shortening the time required for stabilization of refrigerant systems.

Description

Electronic expansion valve control method, device and heat pump equipment

The present disclosure is based on the CN application number 202011494229.7 and the filing date is December 17, 2020, and claims its priority, and the disclosure content of the CN application is hereby incorporated into the present disclosure as a whole.

technical field

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.

Background technique

The heat pump unit can adjust the flow of refrigerant through the electronic expansion valve. Taking the air conditioner as an example, the electronic expansion valve controls the flow of refrigerant entering the evaporator, which determines the amount of refrigerant entering the compressor. In the operation of the variable volume 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.

In the related art, the 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. When the value is set, the electronic expansion valve is triggered to adjust, and the adjustment range of the electronic expansion valve is relatively large, so that the electronic expansion valve may cause secondary interference to the system after the action, resulting in an unbalanced regulation and the system enters the regulation state again.

public content

In order to overcome the problems existing in the related art at least to a certain extent, 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.

To achieve the above purpose, the present disclosure adopts the following technical solutions:

first,

The present disclosure provides a method for regulating an electronic expansion valve, the method comprising:

According to the current pressure difference and current current of the compressor, and using the pressure difference and current of the compressor under the preset standard operating conditions, the current best opening fitting coefficient is obtained;

According to the fitting coefficient of the current optimum opening degree, and using the optimum opening degree of the electronic expansion valve under the standard working condition, 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.

In some embodiments, the method further includes:

obtaining the discharge pressure and suction pressure of the compressor, and obtaining the current differential pressure according to the discharge pressure and the suction pressure, and

Get the current current.

In some embodiments, according to the current 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:

Obtain the current best opening degree fitting coefficient according to the preset opening degree fitting coefficient model;

Wherein, in the opening degree fitting coefficient model, 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, and 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.

In some embodiments, the opening fitting coefficient model includes:

In the formula, Y is the current best opening fitting coefficient, ΔP _x is the current differential pressure, I _x is the current current, ΔP 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.

In some embodiments, the method further includes:

According to the optimal opening degree of the electronic expansion valve when the optimal cooling capacity is obtained under different working conditions, 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;

Among them, 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;

Among them, 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.

In some embodiments, the relationship among the opening of the electronic expansion valve, the compressor pressure difference and the refrigerant flow is configured as:

Among them, K is the opening of the electronic expansion valve, q _m is the refrigerant flow rate, ΔP is the compressor pressure difference, k is a constant, and ρ is the refrigerant density.

In some embodiments, 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:

Using the preset formula K′=f(Y, K ₀ ), the current optimum opening degree is obtained by calculation;

Wherein, K' is the current optimal opening degree, Y is the fitting coefficient of the current optimal opening degree, and K ₀ is the optimal opening degree of the electronic expansion valve under the standard operating conditions.

In some embodiments, where K'=Y*K ₀ .

Second,

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.

Thirdly,

The present disclosure provides a heat pump device, including

one or more memories on which executable programs are stored;

One or more processors for executing the executable program in the memory to implement the steps of any one of the above-mentioned methods.

In some embodiments, 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:

According to the present disclosure, according to the current pressure difference and current current of the compressor, 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. 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.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present disclosure, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

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. .

Detailed ways

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present disclosure. All other implementations obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative work fall within the protection scope of the present disclosure.

Please refer to FIG. 1. 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.

Specifically, the 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. When a set value is reached, 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. . However, the present disclosure belongs to a non-threshold comparison control method. According to the current differential pressure and current current of the compressor, 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.

When the working conditions are the same, in the threshold comparison control mode, because the adjustment range of the electronic expansion valve is relatively large, it is easy to cause a large deviation in the final opening degree. However, under the above scheme of the present disclosure, real-time calculation and control are realized, which is a kind of The fine-tuning correction method, the adjustment range of the electronic expansion valve is relatively small, and the adjustment accuracy is higher.

For 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.

In some embodiments, the method further includes:

Obtain the discharge pressure and suction pressure of the compressor, and obtain the current pressure difference according to the discharge pressure and suction pressure, and obtain the current current.

Specifically, the current pressure difference can be determined by subtracting the suction pressure from the exhaust pressure. In the related art, in the control of electronic expansion valve, there is a conversion from pressure to temperature control. For example, under superheat control, there is a deviation in the formula of pressure conversion into saturation temperature, which makes the data itself biased, resulting in that the electronic expansion valve opening adjustment cannot be guaranteed. accurate. However, under the scheme of the present disclosure, 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.

In some embodiments, 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, the current optimal opening degree fitting coefficient is obtained, including:

Obtain the current best opening fitting coefficient according to the preset opening fitting coefficient model;

Among them, in the opening degree fitting coefficient model, 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.

Specifically, in the above-mentioned opening degree fitting coefficient model, 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.

In some embodiments, according to the fitting coefficient of the current best opening degree, the best opening degree of the electronic expansion valve under standard operating conditions is used to obtain the current optimal opening degree, including:

Using the preset formula K'=f(Y,K ₀ ), for example, K'=Y*K ₀ , the current optimum opening is obtained by calculation;

Among them, K' is the current optimal opening degree, Y is the fitting coefficient of the current optimal opening degree, and K ₀ is the optimal opening degree of the electronic expansion valve under standard operating conditions.

Specifically, under the selected standard working condition, by adjusting the opening degree of the electronic expansion valve, when the cooling capacity reaches the optimum, it is recorded as the optimum opening degree of the electronic expansion valve under the standard working condition. Through this scheme, 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, after obtaining the current best opening fitting coefficient, the preset formula f(Y, K ₀ ), the current optimal opening fitting coefficient and the optimal opening degree of the electronic expansion valve under standard operating conditions are correlated and combined to obtain the current optimal opening degree, so that the refrigeration energy efficiency is the best.

For K′=f(Y, K ₀ ), in practical applications, a correction coefficient can be further added to perform correction and improvement, as shown in the above formula K′=Y*K ₀ , and the correction coefficient is 1.

Regarding the above-mentioned opening degree fitting coefficient model, the present disclosure further provides an implementation method of the opening degree fitting coefficient model.

In some embodiments, the method further includes:

According to the optimal opening degree of the electronic expansion valve when the optimal cooling capacity is obtained under different working conditions, 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;

Specifically, 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). Regarding 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.

Among them, according to the relationship between the optimal opening degrees of the electronic expansion valve corresponding to the two working conditions, an optimal opening degree fitting coefficient can be obtained. For example, according to the optimal opening degrees K ₁ and K ₂ of the electronic expansion valve, An optimal opening fitting coefficient Y ₁ can be obtained, such as:

Y ₁ =K ₂ /K ₁ .

Several optimal opening fitting coefficients can be obtained through each optimal opening, and then the relationship between the opening of the electronic expansion valve, the compressor pressure difference and the refrigerant flow, as well as the refrigerant flow, refrigeration capacity and compressor current are used. relationship, and construct the opening fitting coefficient model.

In some embodiments, the relationship between the opening of the electronic expansion valve, the compressor differential pressure and the refrigerant flow is configured as:

Under the above configuration relationship, 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 ΔP.

The optimum opening degrees K ₁ and K ₂ for two of the electronic expansion valves are:

According to the above example: Y ₁ =K ₂ /K ₁ , it can be further obtained:

Based on the relationship between refrigerant flow, cooling capacity and compressor current: 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:

Among them, I ₁ is the current corresponding to q _m1 , and I ₂ is the current corresponding to q _m2 .

Then, the following opening fitting coefficient model can be obtained:

In the formula, Y is the current best opening fitting coefficient, ΔP _x is the current pressure difference, I _x is the current current, ΔP ₀ is the pressure difference of the compressor under standard conditions, and I ₀ is the compression under standard conditions. machine current.

According to the above-mentioned opening fitting coefficient model, the discharge pressure, suction pressure and compressor current of the compressor can be specifically selected to form the standard working condition. Under the selected standard 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.

It should be pointed out that for the above-mentioned opening fitting coefficient model:

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.

Please refer to FIG. 2 . 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.

In some embodiments, 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.

In some embodiments, the first obtaining module 201 is specifically used for:

In some embodiments, the degree of opening fits a coefficient model, including:

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;

In some embodiments, the second obtaining module 202 is specifically configured to:

Using the preset formula K′=f(Y, K ₀ ), the current optimum opening is obtained by calculation;

In some embodiments, where K'=Y*K ₀ .

Regarding the regulating and controlling device 2 for an electronic expansion valve in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

Please refer to FIG. 3 , which is a schematic structural diagram of a heat pump device according to an exemplary embodiment. As shown in FIG. 3 , the heat pump device 3 includes:

one or more memories 301 on which executable programs are stored;

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.

In practical applications, the heat pump device 3 may include: an air conditioner, a heat pump water heater, a heat pump refrigerator, and the like.

Regarding the heat pump device 3 in the above embodiment, the specific manner in which the processor 302 of the processor 302 executes the program in the memory 301 has been described in detail in the embodiment of the method, and will not be described in detail here.

It can be understood that, the same or similar parts in the above embodiments may refer to each other, and the content not described in detail in some embodiments may refer to the same or similar content in other embodiments.

It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are only used for description purposes, and cannot be understood as indicating or implying relative importance. Also, in the description of the present disclosure, unless otherwise specified, the meanings of "plurality" and "plurality" refer to at least two.

It will be understood that when an element is referred to as being "fixed to" or "disposed to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it will be This may be directly connected to another element or intervening elements may be present at the same time, in addition, "connected" as used herein may include wireless connections; use of the word "and/or" includes any of one or more of the associated listed items. One unit and all combinations.

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.

It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by 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.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be executed when the program is executed. , including one or a combination of the steps of the method embodiment.

In addition, 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.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limitations of the present disclosure, and those of ordinary skill in the art may interpret the above-described embodiments within the scope of the present disclosure. Embodiments are subject to variations, modifications, substitutions and variations.

Claims

A control method of an electronic expansion valve, comprising:

According to the current pressure difference and current current of the compressor, and using the pressure difference and current of the compressor under the preset standard operating conditions, the current best opening fitting coefficient is obtained;

According to the fitting coefficient of the current optimum opening degree, and using the optimum opening degree of the electronic expansion valve under the standard operating conditions, 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 of claim 1, wherein the method further comprises:

obtaining the discharge pressure and suction pressure of the compressor, and obtaining the current differential pressure according to the discharge pressure and the suction pressure, and

Get the current current.
The method according to claim 1 or 2, wherein according to the current pressure difference and current current of the compressor, the current best opening degree fitting coefficient is obtained by using the pressure difference and current of the compressor under a preset standard operating condition, include:

Obtain the current best opening degree fitting coefficient according to the preset opening degree fitting coefficient model;

Wherein, in the opening degree fitting coefficient model, 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, and 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 method of claim 3, wherein the opening fitting coefficient model comprises:

In the formula, Y is the current best opening fitting coefficient, ΔP x is the current differential pressure, I x is the current current, ΔP 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 of claim 3 or 4, wherein the method further comprises:

According to the optimal opening degree of the electronic expansion valve when the optimal cooling capacity is obtained under different working conditions, 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;

Among them, 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;

Among them, 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 method according to claim 5, wherein the relationship among the opening degree of the electronic expansion valve, the compressor pressure difference and the refrigerant flow rate is configured as:

Among them, K is the opening of the electronic expansion valve, q m is the refrigerant flow rate, ΔP is the compressor pressure difference, k is a constant, and ρ is the refrigerant density.
The method according to any one of claims 1 to 6, wherein 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. opening, including:

Using the preset formula K′=f(Y, K 0 ), the current optimum opening degree is obtained by calculation;

Wherein, K' is the current optimal opening degree, Y is the fitting coefficient of the current optimal opening degree, and K 0 is the optimal opening degree of the electronic expansion valve under the standard operating conditions.
The method of claim 7, wherein K'=Y*K 0 .
An adjustment and control device for an electronic expansion valve, characterized in that it includes:

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.
A heat pump device comprising:

one or more memories on which executable programs are stored;

One or more processors for executing the executable program in the memory to implement the steps of the method of any one of claims 1-8.
The heat pump device according to claim 10, wherein the heat pump device comprises: an air conditioner, a heat pump water heater or a heat pump refrigerator.
A storage medium on which a computer program is stored, and when the program is executed by a processor, implements the steps of the method according to any one of claims 1-8.