WO2020038113A1 - Method and device for adjusting initial opening degree of electronic expansion valve, and air conditioner - Google Patents

Abstract

The present invention provides a method and a device for adjusting an initial opening degree of an electronic expansion valve, and an air conditioner. Said method comprises: acquiring an initial opening degree of an electronic expansion valve when an air conditioner is powered on to operate, operation parameters when the air conditioner operates stably, and a stable opening degree of the electronic expansion valve when the air conditioner operates stably; determining a refrigerant filling level of the air conditioner according to the operation parameters; and obtaining, according to the refrigerant filling level and the stable opening degree, an initial opening degree adjustment value, so that the initial opening degree of the electronic expansion valve for the next startup is the initial opening degree adjustment value. The present application adjusts the initial opening degree according to the refrigerant filling level of the air conditioner, and the stable opening degree of the electronic expansion valve when the air conditioner operates stably, achieving the adaptation of the initial opening degree of the electronic expansion valve to the refrigerant filling amount; the initial opening degree no longer being a fixed value avoids the occurrence of liquid return caused by an excessively large initial opening degree of the electronic expansion valve when too much refrigerant is filled in, increasing the reliability of the air conditioner.

Description

Method and device for adjusting initial opening degree of electronic expansion valve and air conditioner Technical field

The invention relates to the technical field of air conditioning control, and in particular, to an initial opening degree adjustment method and device of an electronic expansion valve, and an air conditioner.

Background technique

In the existing variable frequency air conditioners, especially multi-line systems, the throttle components are mostly controlled by electronic expansion valves. Considering the compressor startup platform, output speed, and rapid refrigerant circulation during the startup phase, the electronic expansion valve will also have a startup initialization process during the air conditioner startup phase, and then start automatic control after a certain period of time. At present, the common practice of air conditioner manufacturers is to set a fixed initial opening degree or range for the electronic expansion valve within a fixed period of time during the startup phase. This control method is only applicable to refrigerants with appropriate or low refrigerant charge in the air conditioner. In the situation, when the refrigerant is overcharged, the air conditioner has a large flow rate due to the initial opening of the electronic expansion valve during the startup phase, which makes the evaporator too late to evaporate the refrigerant liquid, so that the refrigerant liquid flows into the compressor. That is, the phenomenon of liquid return occurs, which reduces the reliability of the air conditioner.

Summary of the Invention

In view of this, the present invention aims to propose a method, device and air conditioner for adjusting the initial opening degree of an electronic expansion valve, so as to solve the problem that in the prior art, since the initial opening degree of the electronic expansion valve is set to a fixed value, the air conditioner is Technical problems of liquid return are easy to occur during the initial operation.

To achieve the above object, the technical solution of the present invention is implemented as follows:

In a first aspect, the present invention provides an initial opening adjustment method of an electronic expansion valve, which is applied to an air conditioner. The air conditioner includes an electronic expansion valve. The method includes:

Obtaining an initial opening degree of the electronic expansion valve when the air conditioner is powered on and running;

Obtaining operating parameters when the air conditioner operates stably;

Obtaining a stable opening of the electronic expansion valve when the air conditioner operates stably;

Determining a refrigerant charge level of the air conditioner according to the operating parameter;

An initial opening degree adjustment value is obtained according to the refrigerant charge level and the stable opening degree, so that the initial opening degree of the electronic expansion valve at the next startup is the initial opening degree adjustment value.

Further, the step of adjusting the initial opening degree according to the refrigerant charge level and the stable opening degree to obtain an initial opening degree adjustment value includes:

Calculating a difference between the initial opening degree and the stable opening degree;

The initial opening degree adjustment value is calculated according to the refrigerant charge level and the difference.

Further, the step of calculating the initial opening adjustment value based on the refrigerant charge level and the difference includes:

Determining a corresponding adjustment coefficient according to the refrigerant charge level;

Determining a corresponding adjustment reference value according to the difference;

The initial opening degree adjustment value is calculated according to the adjustment coefficient and the adjustment reference value.

Further, a first correspondence table and a second correspondence table are pre-stored in the air conditioner, wherein the first correspondence table records a correspondence relationship between a refrigerant charge level and an adjustment coefficient, and the second correspondence The relationship table records the correspondence between the difference between the initial opening degree and the stable opening degree and the adjustment reference value, and an adjustment coefficient corresponding to the refrigerant charge level is determined according to the first correspondence relationship table; according to the second The correspondence table determines an adjustment reference value corresponding to the difference;

The initial opening degree adjustment value is calculated according to the adjustment coefficient and the adjustment reference value.

Further, the step of calculating the initial opening degree adjustment value according to the adjustment coefficient and the adjustment reference value includes:

The initial opening degree adjustment value is calculated according to the formula P1 ′ = P1-μ * ΔP, where P1 ′ is the initial opening degree adjustment value, P1 is the initial opening degree of the electronic expansion valve, and μ is the adjustment coefficient. , ΔP is the adjustment reference value.

Further, the operating parameter comprises the average opening of the electronic expansion valve Px, high pressure saturated temperature of the system TH, TL saturation temperature and a low pressure system subcooling [Delta] T, wherein the average opening of the electronic expansion valve is an electronic expansion P _x The average value of the opening degree when the valve reaches the steady state from the starting stage; the system high-pressure saturation temperature T _H is the saturation temperature corresponding to the system high pressure; the system low-pressure saturation temperature T _L is the saturation temperature corresponding to the system low pressure; the subcooling degree ΔT is the system high-pressure saturation temperature T _H and a condenser temperature difference between the tubes.

Further, the step of determining a refrigerant charge level of the air conditioner according to the operating parameter includes:

When Px> k1 and TH≤Ta + m1 and TL≤Tb-n1 and ΔT≤h1, the refrigerant charge level is determined to be the first level, where k1 is the first preset opening degree and Ta is the condensation side Ambient temperature, m1 is the first preset temperature, Tb is the ambient temperature on the evaporation side, n1 is the second preset temperature, and h1 is the third preset temperature;

When k2≤Px≤k1 and Ta + m1 <TH≤Ta + m2 and Tb-n1 <TL≤Tb-n2 and h1 <ΔT≤h2, it is determined that the refrigerant charge level is the second level, where k2 Is the second preset opening degree, m2 is the fourth preset temperature, n2 is the fifth preset temperature, and h2 is the sixth preset temperature;

When k3≤Px <k2 and Ta + m2 <TH <Ta + m3 and Tb-n2 <TL <Tb-n3 and h2 <ΔT <h3, it is determined that the refrigerant charge level is a third level, where k3 Is the third preset opening degree, m3 is the seventh preset temperature, n3 is the eighth preset temperature, and h3 is the ninth preset temperature;

When Px <k3 and TH ≧ Ta + m3 and TL ≧ Tb-n3 and h2 ≧ h3, the refrigerant charge level is determined to be a fourth level.

Further, the minimum value of the initial opening degree adjustment value is a set threshold.

Further, after obtaining the initial opening degree adjustment value according to the refrigerant charge level and the stable opening degree, the method further includes:

Determine whether the initial opening degree adjustment value is greater than the set threshold value, and if it is not satisfied, set the initial opening degree adjustment value to the set threshold value.

Further, the set threshold is P _min + A, where P _min is a minimum opening degree of the electronic expansion valve, and A is a preset value.

In a second aspect, the present invention also provides an initial opening adjustment device of an electronic expansion valve, which is applied to an air conditioner. The air conditioner includes an electronic expansion valve, and the device includes:

An initial opening degree obtaining module, configured to obtain an initial opening degree of the electronic expansion valve when the air conditioner is powered on and operated;

A parameter acquisition module, configured to acquire operating parameters of the air conditioner when the operation is stable;

A stable opening degree obtaining module, configured to obtain a stable opening degree of the electronic expansion valve when the air conditioner operates stably;

A charge level determination module, configured to determine a refrigerant charge level of the air conditioner according to the operating parameter;

The initial opening degree adjustment module is configured to obtain an initial opening degree adjustment value according to the refrigerant charge level and the stable opening degree, so that the initial opening degree of the electronic expansion valve at the next startup is the initial opening degree. Adjustment value.

Further, the initial opening degree adjustment module includes:

A difference calculation module, configured to calculate a difference between the initial opening degree and the stable opening degree;

An adjustment value calculation module is configured to calculate the initial opening degree adjustment value according to the refrigerant charge level and the difference value.

Further, the adjustment value calculation module is configured to:

Determining a corresponding adjustment coefficient according to the refrigerant charge level;

Determining a corresponding adjustment reference value according to the difference;

The initial opening degree adjustment value is calculated according to the adjustment coefficient and the adjustment reference value. Further, a first correspondence table and a second correspondence table are pre-stored in the air conditioner, wherein the first correspondence table records a correspondence relationship between a refrigerant charge level and an adjustment coefficient, and the second correspondence The relationship table records the correspondence between the difference between the initial opening degree and the stable opening degree and the adjustment reference value;

The adjustment value calculation module is configured to determine an adjustment coefficient corresponding to the refrigerant charge level in the first correspondence table, and determine an adjustment reference value corresponding to the difference in the second correspondence table, And calculating the initial opening degree adjustment value according to the adjustment coefficient and the adjustment reference value.

Further, the adjustment value calculation module is configured to calculate the initial opening degree adjustment value according to a formula P1 ′ = P1-μ * ΔP, where P1 ′ is the initial opening degree adjustment value and P1 is the electronic expansion valve The initial opening degree of μ, μ is the adjustment coefficient, and ΔP is the adjustment reference value.

Further, the operating parameter comprises the average opening of the electronic expansion valve Px, high pressure saturated temperature of the system TH, TL and the system low pressure saturation temperature [Delta] T the degree of subcooling; wherein the average opening of the electronic expansion valve is an electronic expansion P _x The average value of the opening degree when the valve reaches the steady state from the starting stage; the system high-pressure saturation temperature T _H is the saturation temperature corresponding to the system high pressure; the system low-pressure saturation temperature T _L is the saturation temperature corresponding to the system low pressure; the subcooling degree ΔT is the system high-pressure saturation temperature T _H and a condenser temperature difference between the tubes.

Further, the charge level determining module is configured to determine the refrigerant charge level as a first level when Px> k1 and TH ≦ Ta + m1 and TL ≦ Tb-n1 and ΔT ≦ h1, where k1 Is the first preset opening degree, Ta is the ambient temperature on the condensation side, m1 is the first preset temperature, Tb is the ambient temperature on the evaporation side, n1 is the second preset temperature, and h1 is the third preset temperature; when k2≤Px When ≤k1 and Ta + m1 <TH≤Ta + m2 and Tb-n1 <TL≤Tb-n2 and h1 <ΔT≤h2, it is determined that the refrigerant charge level is the second level, where k2 is the second preliminary Set the opening degree, m2 is the fourth preset temperature, n2 is the fifth preset temperature, and h2 is the sixth preset temperature; when k3≤Px <k2 and Ta + m2 <TH <Ta + m3 and Tb-n2 <TL When <Tb-n3 and h2 <ΔT <h3, determine that the refrigerant charge level is a third level, where k3 is a third preset opening degree, m3 is a seventh preset temperature, and n3 is an eighth preset Temperature, h3 is the ninth preset temperature; when Px <k3 and TH ≧ Ta + m3 and TL ≧ Tb-n3 and h2 ≧ h3, the refrigerant charge level is determined to be the fourth level.

Further, the initial opening degree adjustment module is further configured to:

After obtaining the initial opening degree adjustment value according to the refrigerant charge level and the stable opening degree, determine whether the initial opening degree adjustment value is greater than the set threshold, and if it is not satisfied, then set the initial opening degree adjustment value. Set to the set threshold.

According to a third aspect, the present invention also provides an air conditioner. The air conditioner includes a controller and a memory storing a computer program. When the computer program is read and run by the controller, the above-mentioned first aspect is implemented. The method described.

Compared with the prior art, the method for adjusting the initial opening degree of the electronic expansion valve according to the present invention has the following advantages:

According to the method for adjusting the initial opening degree of the electronic expansion valve according to the present invention, the initial opening degree of the electronic expansion valve is adjusted according to the refrigerant charge level of the air conditioner and the stable opening degree of the electronic expansion valve when the air conditioner runs stably, thereby achieving The initial opening of the electronic expansion valve is adaptive to the refrigerant charge. The initial opening is no longer a fixed value. This prevents the initial opening of the electronic expansion valve from being too large when the refrigerant is overcharged, which can cause the air conditioner to return. Liquid phenomenon, thereby effectively reducing the risk of liquid return and improving the reliability of the air conditioner.

The initial opening degree adjusting device of the electronic expansion valve and the air conditioner and the above-mentioned initial opening degree adjusting method of the electronic expansion valve have the same advantages over the prior art, and will not be repeated here.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and the descriptions thereof are used to explain the present invention, and do not constitute an improper limitation on the present invention. In the drawings:

1 is a structural block diagram of an air conditioner according to an embodiment of the present invention;

2 is a schematic flowchart of a method for adjusting an initial opening degree of an electronic expansion valve according to an embodiment of the present invention;

3 is a schematic diagram of a correspondence relationship between operating parameters and a refrigerant charge level according to an embodiment of the present invention;

4 is a schematic diagram of a sub-step of step S105 in FIG. 2;

5 is a schematic diagram of a first correspondence table according to an embodiment of the present invention;

6 is a schematic diagram of a second correspondence table according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of functional modules of an initial opening adjustment device of an electronic expansion valve according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of specific functional modules of the initial opening degree adjustment module in FIG. 7.

Reference sign description:

1-air conditioner; 2-electronic expansion valve; 3-condenser; 4-evaporator; 5-compressor; 6-first pressure sensor; 7-second pressure sensor; 8-first temperature sensor; 9-th Two temperature sensors; 10-third temperature sensor; 11-memory; 12-controller; 13- initial opening adjustment device of electronic expansion valve; 14- initial opening acquisition module; 15- parameter acquisition module; 16- stable opening Degree acquisition module; 17- charge level determination module; 18- initial opening degree adjustment module; 19- difference calculation module; 20- adjustment value calculation module.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The components of embodiments of the invention, generally described and illustrated in the figures herein, can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall into the protection scope of the present invention.

The method and device for adjusting the initial opening degree of the electronic expansion valve provided by the embodiment of the present invention can be applied to the air conditioner 1 shown in FIG. 1. The air conditioner 1 includes an electronic expansion valve 2, a condenser 3, an evaporator 4, a compressor 5, a first pressure sensor 6, a second pressure sensor 7, a first temperature sensor 8, a second temperature sensor 9, and a third temperature sensor. 10. The memory 11 and the controller 12, the electronic expansion valve 2, the evaporator 4, the compressor 5, and the condenser 3 are connected in order by pipes to form a closed system, and the refrigerant continuously circulates in the system pipes; The first pressure sensor 6 is arranged on the pipeline between the compressor 5 and the condenser 3, and is used to detect the pressure of the exhaust side pipeline of the compressor 5, that is, the system high pressure; the second pressure sensor 7 is arranged on the The pipeline between the compressor 5 and the evaporator 4 is used to detect the pressure on the suction side pipeline of the compressor 5, that is, the system low pressure; the first temperature sensor 8 is used to detect the pressure of the condenser 3 Outlet temperature; the second temperature sensor 9 is used to detect the ambient temperature on the condensation side (that is, the ambient temperature at which the condenser 3 is located); and the third temperature sensor 10 is used to detect the ambient temperature on the evaporation side (that is, the (Ambient temperature at which evaporator 4 is located)

The electronic expansion valve 2, condenser 3, evaporator 4, compressor 5, first pressure sensor 6, second pressure sensor 7, first temperature sensor 8, second temperature sensor 9, third temperature sensor 10, and memory 11 are electrically connected to the controller 12. After the air conditioner 1 is powered on, the controller 12 can monitor the working conditions of the electronic expansion valve 2, the condenser 3, the evaporator 4, and the compressor 5 in real time, and obtain the first A system high pressure detected by a pressure sensor 6, a system low pressure detected by a second pressure sensor 7, the outlet temperature of the condenser 3 detected by a first temperature sensor 8, an ambient temperature on the condensation side detected by a second temperature sensor 9, and a third temperature sensor The detected ambient temperature on the evaporation side is used to judge the refrigerant charge level in the air conditioner 1. In addition, the controller 12 can adjust the initial opening degree of the electronic expansion valve 2 according to the refrigerant charge level and the stable opening degree of the electronic expansion valve 2 when the air conditioner 1 runs stably, so that the initial opening of the electronic expansion valve 2 at the next startup The degree is the adjusted initial opening degree, so as to realize the self-adaptation of the initial expansion degree of the electronic expansion valve 2 to the refrigerant charge amount, and avoid the excessive initial charge of the electronic expansion valve 2 when the refrigerant charge is excessive. The liquid return phenomenon occurs in the air conditioner 1, thereby effectively reducing the risk of liquid return and improving the reliability of the air conditioner 1.

Please refer to FIG. 2, which is a schematic flowchart of a method for adjusting an initial opening degree of an electronic expansion valve according to an embodiment of the present invention. It should be noted that the initial opening degree adjustment method of the electronic expansion valve according to the present invention is not limited to the specific sequence described in FIG. 2 and the following. It should be understood that, in other embodiments, the order of some steps in the method for adjusting the initial opening degree of the electronic expansion valve according to the present invention may be exchanged with each other according to actual needs, or some of the steps may be omitted or deleted. The method for adjusting the initial opening degree of the electronic expansion valve can be applied to the controller 12 described above. The specific process shown in FIG. 2 will be described in detail below.

Step S101: Obtain an initial opening degree of the electronic expansion valve 2 when the air conditioner 1 is powered on.

In this embodiment, when the air conditioner 1 is powered on, the controller 12 obtains an initial opening degree of the electronic expansion valve 2.

Step S102: Obtain operating parameters of the air conditioner 1 when the operation is stable.

In this embodiment, after the air conditioner 1 is powered on, the controller 12 monitors the real-time operating parameters of the air conditioner 1. When the real-time operating parameters do not change, it indicates that the air conditioner 1 is running in a stable state. The real-time operating parameters are the operating parameters when the air conditioner 1 runs stably.

In this embodiment, the operating parameters include the average opening degree P _{x of the} electronic expansion valve 2, the system high-pressure saturation temperature T _H , the system low-pressure saturation temperature T _L, and the subcooling degree ΔT. Among them, the average opening degree P _x of the electronic expansion valve 2 is the average opening degree of the electronic expansion valve 2 when it reaches the stable state from the startup stage; the system high-pressure saturation temperature T _H refers to the saturation temperature corresponding to the high-pressure of the system. The corresponding relationship between the system high pressure and the saturation temperature is stored. The controller 12 can obtain the saturation temperature corresponding to the system high pressure according to the system high pressure detected by the first pressure sensor 6. The system low pressure saturation temperature T _L refers to the saturation temperature corresponding to the system low pressure. The corresponding relationship between the system low pressure and the saturation temperature is stored in the controller 12, and the controller 12 can obtain the saturation temperature corresponding to the system low pressure according to the system low pressure detected by the second pressure sensor 7. The subcooling degree ΔT is the system high pressure saturation temperature T _H and The difference between the outlet temperature of the condenser 3 and the controller 12 subtracts the obtained system low-pressure saturation temperature T _L from the outlet temperature of the condenser 3 to obtain the subcooling degree ΔT.

Step S103: Obtain a stable opening degree of the electronic expansion valve 2 when the air conditioner 1 runs stably.

In this embodiment, when the controller 12 determines that the air conditioner 1 is operating in a stable state, the current opening degree of the electronic expansion valve 2 is obtained, that is, the stable opening degree of the electronic expansion valve 2.

In step S104, the refrigerant charge level of the air conditioner 1 is determined according to the operating parameters.

In this embodiment, the controller 12 determines the refrigerant charge level of the air conditioner 1 based on the average opening degree P _{x of the} electronic expansion valve 2, the system high-pressure saturation temperature T _H , the system low-pressure saturation temperature T _L, and the subcooling degree ΔT. . The step S104 specifically includes: when P _x > k ₁ and T _H ≤T _a + m ₁ and T _L ≤T _b -n ₁ and ΔT ≤ h ₁ , determining that the refrigerant charge level is a first level, Among them, k ₁ is the first preset opening degree, T _a is the ambient temperature on the condensation side, m ₁ is the first preset temperature, T _b is the ambient temperature on the evaporation side, n ₁ is the second preset temperature, and h ₁ is the first Three preset temperatures; when k ₂ ≤P _x ≤k ₁ and T _a + m ₁ ＜ T _H ≤T _a + m ₂ and T _b -n ₁ ＜ T _L ≤T _b -n ₂ and h ₁ ＜ ΔT≤ At h ₂ , the refrigerant charge level is determined to be the second level, where k ₂ is the second preset opening degree, m ₂ is the fourth preset temperature, n ₂ is the fifth preset temperature, and h ₂ is Sixth preset temperature; when k ₃ ≤P _x <k ₂ and T _a + m ₂ <T _H <T _a + m ₃ and T _b -n ₂ <T _L <T _b -n ₃ and h ₂ <ΔT When <h ₃ , the refrigerant charge level is determined to be the third level, where k ₃ is the third preset opening degree, m ₃ is the seventh preset temperature, n ₃ is the eighth preset temperature, and h ₃ Is the ninth preset temperature; when P _x <k ₃ and T _H ≥T _a + m ₃ and T _L ≥T _b -n ₃ and h ₂ ≥h ₃ , determine that the refrigerant charge level is fourth grade.

In this embodiment, the first level can be set to "less charge", the second level can be set to "appropriate charge", the third level can be set to "large charge", and the fourth level can be set to "charge amount" Severe ", the first preset opening degree k ₁ is 350 steps, the second preset opening degree k ₂ is 150 steps, the third preset opening degree k ₃ is 100 steps, and the first preset temperature m ₁ is 10 ° C. The second preset temperature n ₁ is 12 ° C, the third preset temperature h ₁ is 2 ° C, the fourth preset temperature m ₂ is 13 ° C, the fifth preset temperature n ₂ is 8 ° C, and the sixth preset temperature h ₂ is 3 ° C, the seventh preset temperature m ₃ is 18 ° C, the eighth preset temperature n ₃ is 5 ° C, and the ninth preset temperature h ₃ is 5 ° C. The operating parameters shown in FIG. 3 and For the correspondence relationship of the refrigerant charge levels, the controller 12 may determine the refrigerant charge level after referring to the correspondence relationship shown in FIG. 3 after obtaining the operating parameters of the air conditioner 1 during stable operation.

In step S105, an initial opening degree adjustment value is obtained according to the refrigerant charge level and the stable opening degree, so that the initial opening degree of the electronic expansion valve 2 at the next startup is the initial opening degree adjustment value, so that The adjustment of the initial opening degree is realized.

As shown in FIG. 4, step S105 includes the following sub-steps:

Sub-step S1051, calculating a difference between the initial opening degree and the stable opening degree.

In this embodiment, assuming that the initial opening degree of the electronic expansion valve 2 is P ₁ and the stable opening degree of the electronic expansion valve 2 is P ₂ , the controller 12 can calculate according to the initial opening degree P ₁ and the stable opening degree P ₂ . Differences P ₂ -P ₁ .

In step S1052, the initial opening degree adjustment value is calculated according to the refrigerant charge level and the difference.

In this embodiment, a first correspondence table and a second correspondence table are pre-stored in the air conditioner 1, wherein the first correspondence table records a correspondence relationship between a refrigerant charge level and an adjustment coefficient. The second correspondence relationship table records the correspondence between the difference between the initial opening degree and the stable opening degree and the adjustment reference value. The sub-step S1052 specifically includes: determining an adjustment coefficient corresponding to the refrigerant charge level according to the first correspondence table, determining an adjustment reference value corresponding to the difference according to the second correspondence table, and according to the The adjustment coefficient and the adjustment reference value calculate the initial opening degree adjustment value.

In this embodiment, the adjustment coefficient μ corresponding to “less charge amount” in the refrigerant charge level is preferably “0”; the adjustment coefficient μ corresponding to “appropriate charge amount” is preferably “1”; “charge amount The range of the adjustment coefficient μ corresponding to “multi” is [1.05, 1.1], preferably “1.05”; the range of the adjustment coefficient μ corresponding to “severely charged” is (1.1, 1.2], preferably “ 1.2 "; in this way, the first correspondence table shown in FIG. 5 can be obtained.

In this embodiment, when the difference P ₂ -P _{1 is set to be} less than or equal to “0”, the corresponding adjustment reference value ΔP is preferably “0”; the difference P ₂ -P _{1 is} greater than “0” and less than or equal to When "50", the corresponding adjustment reference value ΔP ranges from [10, 20], preferably "20"; when the difference P ₂ -P _{1 is} greater than "50" and less than or equal to "100", the corresponding The adjustment reference value ΔP ranges from (20, 40], preferably 40; when the difference P ₂ -P _{1 is} greater than "100", the corresponding adjustment reference value ΔP ranges from (40, 60], preferably Is 60; thus, a second correspondence table shown in FIG. 6 can be obtained.

After obtaining the adjustment coefficient corresponding to the refrigerant charge level according to the first correspondence table shown in FIG. 5 and the adjustment reference value corresponding to the difference according to the second correspondence table shown in FIG. The initial opening degree adjustment value is calculated according to the formula P ₁ ′ = P ₁ −μ * ΔP, where P ₁ ′ is the initial opening degree adjustment value, and P ₁ is the initial opening degree of the electronic expansion valve 2, μ Is the adjustment coefficient, and ΔP is the adjustment reference value. It can be seen that when the refrigerant charge is small, the air conditioner 1 basically has no risk of liquid return, so there is no need to modify the initial opening degree; when the refrigerant charge is too large, the initial opening degree P ₁ and the stable opening degree P ₂ The larger the difference between them, the longer the operation time of the electronic expansion valve 2 and the greater the risk of liquid return. Therefore, when the initial opening degree P ₁ is adjusted, the more the refrigerant charge amount is, the larger the adjustment coefficient μ is, the larger the difference between the initial opening degree P ₁ and the stable opening degree P ₂ is, the more the adjustment reference value ΔP should be. It is large to reduce the flow and stabilization time of the electronic expansion valve 2 when the air conditioner 1 is powered on, and reduce the risk of liquid return. In this way, when the air conditioner 1 is powered on next time, the controller 12 will control the initial opening degree of the electronic expansion valve 2 to be the initial opening degree adjustment value, thereby realizing the initial opening degree of the electronic expansion valve 2 according to the refrigerant charge amount. Make adaptive adjustments instead of fixed values.

It should be noted that, in practice, when the controller 12 adjusts the initial opening degree of the electronic expansion valve 2, the initial opening degree of the electronic expansion valve 2 cannot be adjusted to an unlimited size, which may cause the electronic expansion valve 2 to fail to open normally. Affects the normal operation of the air conditioner 1. Therefore, in this embodiment, a preset threshold is stored in the controller 12 in advance, and the set threshold is the minimum value of the initial opening adjustment value, that is, the initial opening of the electronic expansion valve 2 is adjusted. When adjusting the degree, it is necessary to ensure that the obtained initial opening degree adjustment value cannot be lower than the set threshold value. If the initial opening degree adjustment value is lower than the set threshold value, the set threshold value is used as the current initial opening degree adjustment value. For example, the set threshold may be P _min + A, where P _min is the minimum opening degree of the electronic expansion valve 2 and is determined by the characteristics of the electronic expansion valve 2. A is a preset value and can be set at [30, 50 The value in the range of] is preferably 30. After the controller 12 calculates the initial opening degree adjustment value P ₁ ′, it needs to further determine whether the initial opening degree adjustment value P ₁ ′ satisfies P ₁ ′ ≧ P _min + A. If it is not satisfied, the initial opening degree is adjusted. The adjustment value P ₁ ′ is determined as P _min + A to ensure that the minimum value of the initial opening degree adjustment value P ₁ ′ is the set threshold value P _min + A.

Please refer to FIG. 7, which is a schematic diagram of a functional module of an initial opening adjustment device 13 of an electronic expansion valve according to an embodiment of the present invention. It should be noted that the basic principle and technical effect of the initial opening adjustment device 13 of the electronic expansion valve according to the embodiment of the present invention are the same as those of the foregoing method embodiment. For the sake of brief description, parts not mentioned in this embodiment , Refer to the corresponding content of the foregoing method embodiments. The initial opening adjustment device 13 of the electronic expansion valve can be applied to the above-mentioned controller 12 and includes an initial opening acquisition module 14, a parameter acquisition module 15, a stable opening acquisition module 16, a charge level determination module 17, and an initial Opening adjustment module 18.

It can be understood that the above-mentioned initial opening degree acquisition module 14, parameter acquisition module 15, stable opening degree acquisition module 16, filling level determination module 17, and initial opening degree adjustment module 18 may be software function modules and computers stored in the memory 11. The program is executed by the controller 12.

The initial opening degree obtaining module 14 is configured to obtain an initial opening degree of the electronic expansion valve 2 when the air conditioner 1 is powered on and operated.

It can be understood that the initial opening degree obtaining module 14 may perform the above step S101.

The parameter acquisition module 15 is configured to acquire operating parameters of the air conditioner 1 when the operation is stable.

It can be understood that the parameter obtaining module 15 may perform the above step S102.

The stable opening degree acquisition module 16 is configured to obtain a stable opening degree of the electronic expansion valve 2 when the air conditioner 1 runs stably.

It can be understood that the stable opening degree obtaining module 16 may perform the above step S103.

The charging level determining module 17 is configured to determine a refrigerant charging level of the air conditioner 1 according to the operating parameter.

In this embodiment, the operating parameters include an average opening degree P _{x of} the electronic expansion valve 2, a system high-pressure saturation temperature T _H , a system low-pressure saturation temperature T _L, and a subcooling degree ΔT, and the charging level determination module 17 specifically configured to, when P _x> k ₁ and T _H ≤T _a + m ₁ and T _L ≤T _b -n ₁ and ΔT≤h ₁ when determining the level of refrigerant charge is the first level, wherein, k ₁ is the first preset opening degree, T _a is the ambient temperature on the condensation side, m ₁ is the first preset temperature, T _b is the ambient temperature on the evaporation side, n ₁ is the second preset temperature, and h ₁ is the third preset temperature. Set temperature; when k ₂ ≤P _x ≤k ₁ and T _a + m ₁ ＜ T _H ≤T _a + m ₂ and T _b -n ₁ ＜ T _L ≤T _b -n ₂ and h ₁ ＜ ΔT≤h ₂ At that time, it is determined that the refrigerant charge level is a second level, where k ₂ is a second preset opening degree, m ₂ is a fourth preset temperature, n ₂ is a fifth preset temperature, and h ₂ is a sixth Preset temperature; when k ₃ ≤P _x <k ₂ and T _a + m ₂ <T _H <T _a + m ₃ and T _b -n ₂ <T _L <T _b -n ₃ and h ₂ <ΔT <h _3, to determine the refrigerant charge level is the third level, wherein, k ₃ is a third predetermined opening degree, m ₃ is the seventh predetermined temperature, n ₃ Eighth preset temperature, h ₃ ninth predetermined temperature; when P _x <k _3, and T _H ≥T _a + m ₃ and T _L ≥T _b -n ₃ and h ₂ ≥h _3, it is determined the The refrigerant charge level is the fourth level.

It can be understood that the filling level determination module 17 can perform the above step S104.

The initial opening degree adjustment module 18 is configured to obtain an initial opening degree adjustment value according to the refrigerant charge level and the stable opening degree, and the initial opening degree adjustment value is used to adjust the initial opening degree so that all The initial opening degree of the electronic expansion valve 2 at the next startup is the initial opening degree adjustment value.

It can be understood that the initial opening degree adjustment module 18 can execute the above step S105.

As shown in FIG. 8, the initial opening degree adjustment module 18 includes a difference calculation module 19 and an adjustment value calculation module 20.

The difference calculation module 19 is configured to calculate a difference between the initial opening degree and the stable opening degree.

It can be understood that the difference calculation module 19 may perform the above step S1051.

The adjustment value calculation module 20 is configured to calculate the initial opening degree adjustment value according to the refrigerant charge level and the difference.

Specifically, the adjustment value calculation module 20 is configured to calculate the adjustment value of the initial opening degree according to a formula P ₁ ′ = P ₁ −μ * ΔP, where P ₁ ′ is the adjustment value of the initial opening degree, and P ₁ is The initial opening degree of the electronic expansion valve 2 is μ, the adjustment coefficient, and ΔP is the adjustment reference value. The adjustment coefficient is determined by the refrigerant charge level, and the adjustment reference value is determined by the difference between the initial opening degree and the stable opening degree. In this embodiment, a first correspondence table and a second correspondence table are pre-stored in the air conditioner 1, wherein the first correspondence table records a correspondence relationship between a refrigerant charge level and an adjustment coefficient. The second correspondence relationship table records the correspondence between the difference between the initial opening degree and the stable opening degree and the adjustment reference value. The adjustment value calculation module 20 is configured to determine an adjustment coefficient corresponding to the refrigerant charge level in the first correspondence table, and determine an adjustment reference value corresponding to the difference in the second correspondence table. And calculating the initial opening degree adjustment value according to the adjustment coefficient and the adjustment reference value.

It can be understood that the adjustment value calculation module 20 can execute the above step S1052.

In summary, the method and device for adjusting the initial opening degree of the electronic expansion valve and the air conditioner provided in the embodiments of the present invention obtain the initial opening degree of the electronic expansion valve when the air conditioner is powered on and run; Operating parameters of the air conditioner when the operation is stable; obtaining a stable opening of the electronic expansion valve when the air conditioner is operating stably; determining a refrigerant charge level of the air conditioner according to the operating parameters; and according to the refrigerant The charging level and the stable opening degree obtain an initial opening degree adjustment value, and the initial opening degree is adjusted so that the initial opening degree at the next startup of the electronic expansion valve is the initial opening degree adjustment value. The invention adjusts the initial opening degree of the electronic expansion valve according to the refrigerant charge level of the air conditioner and the stable opening degree of the electronic expansion valve when the air conditioner runs stably, and realizes the initial opening degree of the electronic expansion valve to charge the refrigerant. Self-adaptation, the initial opening degree is no longer a fixed value, to avoid the initial opening of the electronic expansion valve being too large when the refrigerant is overcharged, causing the air conditioner to return liquid, thereby effectively reducing the risk of liquid return and improving the air conditioner Reliability.

The above detailed description has explained the embodiments of the method, the device, and the air conditioner for the initial opening degree adjustment of the electronic expansion valve by using a schematic diagram, a flowchart, and / or an example. Where such a schematic diagram, flowchart, and / or example includes one or more functions and / or operations, those skilled in the art should understand that each function and / or operation in this schematic diagram, flowchart, or example may be Implemented individually and / or collectively by various structures, hardware, software, firmware, or essentially any combination thereof. In one embodiment, several parts of the subject matter described in the embodiments of the present invention may be implemented by an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a digital signal processor (DSP), or other integrated formats. However, those skilled in the art should recognize that some aspects of the embodiments disclosed herein may be implemented in an integrated circuit, in whole or in part, equivalently, as one or more processors running on one or more processors. A program (eg, implemented as one or more programs running on one or more microprocessors), implemented as firmware, or substantially any combination of the foregoing. In addition, those skilled in the art will recognize that the mechanisms of the subject matter described in the present disclosure can be distributed as various forms of program products, and regardless of the specific type of signal bearing medium actually used to perform the distribution, The exemplary embodiments are applicable.

Unless there are technical obstacles or contradictions, the above various embodiments of the present invention can be freely combined to form further embodiments, and these additional embodiments are all within the protection scope of the present invention.

Although the present invention has been described with reference to the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate preferred embodiments of the present invention, and should not be construed as a limitation of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of protection.

Claims (19)

1. A method for adjusting an initial opening degree of an electronic expansion valve is applied to an air conditioner (1). The air conditioner (1) includes an electronic expansion valve (2), wherein the method includes:

   Obtaining an initial opening degree of the electronic expansion valve (2) when the air conditioner (1) is powered on and operated;

   Acquiring operating parameters of the air conditioner (1) when the operation is stable;

   Obtaining a stable opening of the electronic expansion valve (2) when the air conditioner (1) is operating stably;

   Determining a refrigerant charge level of the air conditioner (1) according to the operating parameter;

   An initial opening degree adjustment value is obtained according to the refrigerant charge level and the stable opening degree, so that the initial opening degree of the electronic expansion valve (2) at the next startup is the initial opening degree adjustment value.
2. The method for adjusting the initial opening degree of an electronic expansion valve according to claim 1, wherein the initial opening degree is adjusted according to the refrigerant charge level and the stable opening degree to obtain an initial opening degree adjustment value. The steps include:

   Calculating a difference between the initial opening degree and the stable opening degree;

   The initial opening degree adjustment value is calculated according to the refrigerant charge level and the difference.
3. The method for adjusting an initial opening degree of an electronic expansion valve according to claim 2, wherein the step of calculating the initial opening degree adjustment value according to the refrigerant charge level and the difference value comprises:

   Determining a corresponding adjustment coefficient according to the refrigerant charge level;

   Determining a corresponding adjustment reference value according to the difference;

   The initial opening degree adjustment value is calculated according to the adjustment coefficient and the adjustment reference value.
4. The method for adjusting the initial opening degree of an electronic expansion valve according to claim 3, wherein a first correspondence table and a second correspondence table are pre-stored in the air conditioner (1), wherein the first correspondence The relationship table records the correspondence between the refrigerant charge level and the adjustment coefficient, and the second correspondence relationship table records the correspondence between the difference between the initial opening degree and the stable opening degree and the adjustment reference value, according to the first The correspondence relationship table determines an adjustment coefficient corresponding to the refrigerant charge level;

   An adjustment reference value corresponding to the difference is determined according to the second correspondence relationship table.
5. The method for adjusting an initial opening degree of an electronic expansion valve according to claim 3, wherein the step of calculating the initial opening degree adjustment value according to the adjustment coefficient and the adjustment reference value comprises:

   The initial opening degree adjustment value is calculated according to the formula P ₁ ′ = P ₁ −μ * ΔP, where P ₁ ′ is the initial opening degree adjustment value, and P ₁ is the initial opening degree of the electronic expansion valve (2). , Μ is the adjustment coefficient, and ΔP is the adjustment reference value.
6. The initial opening degree of the electronic expansion valve of a regulating method according to claim wherein said operating parameter comprises an average degree of opening of the electronic expansion valve (2) of P _x, the saturation temperature of the high pressure system TH, the system low pressure saturation The temperature T _L and the degree of subcooling ΔT, where the average opening degree P _x of the electronic expansion valve (2) is the average opening degree of the electronic expansion valve (2) when it reaches the steady state from the startup stage; the system high-pressure saturation temperature T _H is saturation temperature corresponding to the high pressure system; a system low pressure saturation temperature T _L of the low-pressure corresponding saturation temperature system; undercooling ΔT between the high-pressure saturation temperature T _H of the system with the condenser (3) is a pipe temperature difference.
7. The method for adjusting the initial opening degree of an electronic expansion valve according to claim 6, wherein the step of determining a refrigerant charge level of the air conditioner (1) according to the operating parameter comprises:

   When P _x > k ₁ and T _H ≤T _a + m ₁ and T _L ≤T _b -n ₁ and ΔT ≤ h ₁ , it is determined that the refrigerant charge level is the first level, where k ₁ is the first A preset opening degree, T _a is the ambient temperature on the condensation side, m ₁ is the first preset temperature, T _b is the ambient temperature on the evaporation side, n ₁ is the second preset temperature, and h ₁ is the third preset temperature;

   Determined when k ₂ ≤P _x ≤k ₁ and T _a + m ₁ <T _H ≤T _a + m ₂ and T _b -n ₁ <T _L ≤T _b -n ₂ and h ₁ <ΔT≤h ₂ The refrigerant charge level is a second level, where k ₂ is a second preset opening degree, m ₂ is a fourth preset temperature, n ₂ is a fifth preset temperature, and h ₂ is a sixth preset temperature. ;

   When k ₃ ≤P _x <k ₂ and T _a + m ₂ <T _H <T _a + m ₃ and T _b -n ₂ <T _L <T _b -n ₃ and h ₂ <ΔT <h ₃ , determine The refrigerant charge level is a third level, where k ₃ is a third preset opening degree, m ₃ is a seventh preset temperature, n ₃ is an eighth preset temperature, and h ₃ is a ninth preset temperature. ;

   When P _x <k ₃ and T _H ≥T _a + m ₃ and T _L ≥T _b -n ₃ and h ₂ ≥h ₃ , it is determined that the refrigerant charge level is a fourth level.
8. The method for adjusting an initial opening degree of an electronic expansion valve according to any one of claims 1 to 7, wherein a minimum value of the initial opening degree adjustment value is a set threshold.
9. The method for adjusting the initial opening degree of an electronic expansion valve according to claim 8, wherein after obtaining the initial opening degree adjustment value according to the refrigerant charge level and the stable opening degree, further comprising:

   Determine whether the initial opening degree adjustment value is greater than the set threshold value, and if it is not satisfied, set the initial opening degree adjustment value to the set threshold value.
10. The method for adjusting the initial opening degree of an electronic expansion valve according to claim 8, wherein the set threshold value is P _min + A, wherein P _min is a minimum opening degree of the electronic expansion valve (2), A is the preset value.
11. An initial opening adjustment device of an electronic expansion valve is applied to an air conditioner (1). The air conditioner (1) includes an electronic expansion valve (2), wherein the device includes:

    An initial opening degree acquisition module (14), configured to obtain an initial opening degree of the electronic expansion valve (2) when the air conditioner (1) is powered on and operated;

    A parameter acquisition module (15), configured to acquire operating parameters of the air conditioner (1) when the operation is stable;

    A stable opening degree obtaining module (16), configured to obtain a stable opening degree of the electronic expansion valve (2) when the air conditioner (1) runs stably;

    A charging level determining module (17), configured to determine a refrigerant charging level of the air conditioner (1) according to the operating parameter;

    The initial opening degree adjustment module (18) is used to obtain an initial opening degree adjustment value according to the refrigerant charge level and the stable opening degree, so that the initial opening degree of the electronic expansion valve (2) at the next startup Adjust the value for the initial opening degree.
12. The initial opening degree adjustment device for an electronic expansion valve according to claim 11, wherein the initial opening degree adjustment module (18) comprises:

    A difference calculation module (19), configured to calculate a difference between the initial opening degree and the stable opening degree;

    An adjustment value calculation module (20) is configured to calculate the initial opening degree adjustment value according to the refrigerant charge level and the difference value.
13. The initial opening degree adjustment device for an electronic expansion valve according to claim 12, wherein the adjustment value calculation module (20) is configured to:

    Determining a corresponding adjustment coefficient according to the refrigerant charge level;

    Determining a corresponding adjustment reference value according to the difference;

    The initial opening degree adjustment value is calculated according to the adjustment coefficient and the adjustment reference value.
14. The initial opening adjustment device for an electronic expansion valve according to claim 13, wherein a first correspondence table and a second correspondence table are pre-stored in the air conditioner (1), wherein the first correspondence The relationship table records a correspondence relationship between a refrigerant charge level and an adjustment coefficient, and the second correspondence relationship table records a correspondence relationship between a difference between an initial opening degree and a stable opening degree and an adjustment reference value;

    The adjustment value calculation module (20) is configured to determine an adjustment coefficient corresponding to the refrigerant charge level in the first correspondence relationship table, and determine an adjustment corresponding to the difference value in the second correspondence relationship table. A reference value, and calculating the initial opening degree adjustment value according to the adjustment coefficient and the adjustment reference value.
15. The device for adjusting the initial opening degree of an electronic expansion valve according to claim 14, wherein the adjustment value calculation module (20) is configured to calculate the initial opening degree according to a formula P ₁ ′ = P ₁ -μ * ΔP The adjustment value, wherein P ₁ ′ is the initial opening degree adjustment value, P ₁ is the initial opening degree of the electronic expansion valve (2), μ is the adjustment coefficient, and ΔP is the adjustment reference value.
16. The initial opening of electronic expansion valve according to claim 11, wherein the adjusting device, wherein said operating parameter comprises an average degree of opening of the electronic expansion valve (2) of P _x, the saturation temperature of the high pressure system T _H, a low pressure system wherein the average value of the opening degree, the average opening of the electronic expansion valve (2) P _x reaches a steady state from start-up stage of the electronic expansion valve (2);; T _L and the saturation temperature undercooling ΔT pressure saturated temperature of the system T _H the system high pressure corresponding saturation temperature; system low pressure saturation temperature T _L of the low-pressure corresponding saturation temperature system; undercooling ΔT between the high-pressure saturation temperature T _H of the system with the condenser (3) is a pipe temperature difference .
17. The initial opening adjustment device for an electronic expansion valve according to claim 16, wherein the charging level determination module (17) is used when P _x > k ₁ and T _H ≤T _a + m ₁ and T _{When L} ≤ T _b -n ₁ and ΔT ≤ h ₁ , the refrigerant charge level is determined to be the first level, where k ₁ is the first preset opening degree, T _a is the ambient temperature on the condensation side, and m ₁ is The first preset temperature, T _b is the ambient temperature on the evaporation side, n ₁ is the second preset temperature, and h ₁ is the third preset temperature; when k ₂ ≤P _x ≤k ₁ and T _a + m ₁ <T _H When ≤T _a + m ₂ and T _b -n ₁ <T _L ≤T _b -n ₂ and h ₁ <ΔT≤h ₂ , it is determined that the refrigerant charge level is the second level, where k ₂ is the first Two preset openings, m ₂ is the fourth preset temperature, n ₂ is the fifth preset temperature, and h ₂ is the sixth preset temperature; when k _{3 ≤} P _x <k ₂ and T _a + m ₂ <T _{When H} <T _a + m ₃ and T _b -n ₂ <T _L <T _b -n ₃ and h ₂ <ΔT <h ₃ , the refrigerant charge level is determined to be a third level, where k ₃ is The third preset opening degree, m ₃ is the seventh preset temperature, n ₃ is the eighth preset temperature, and h ₃ is the ninth preset temperature; when P _x <k ₃ and T _H ≥T _a When + m ₃ and T _L ≥T _b -n ₃ and h ₂ ≥h ₃ , the refrigerant charge level is determined to be a fourth level.
18. The initial opening degree adjusting device for an electronic expansion valve according to claim 11, wherein the initial opening degree adjusting module (18) is further configured to:

    After obtaining the initial opening degree adjustment value according to the refrigerant charge level and the stable opening degree, determine whether the initial opening degree adjustment value is greater than the set threshold, and if it is not satisfied, then set the initial opening degree adjustment value. Set to the set threshold.
19. An air conditioner (1), characterized in that the air conditioner (1) includes a controller (12) and a memory (11) storing a computer program, and the computer program is read by the controller (12) When running in parallel, the method according to any one of claims 1-10 is implemented.

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