CN106403140A - Method for controlling electronic expansion valve of air cooling unit - Google Patents
Method for controlling electronic expansion valve of air cooling unit Download PDFInfo
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- CN106403140A CN106403140A CN201510447302.8A CN201510447302A CN106403140A CN 106403140 A CN106403140 A CN 106403140A CN 201510447302 A CN201510447302 A CN 201510447302A CN 106403140 A CN106403140 A CN 106403140A
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- expansion valve
- electric expansion
- aperture
- valve
- superheat
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Abstract
A method for controlling an electronic expansion valve of an air cooling unit includes adjusting the open degree of the electronic expansion valve according to operation parameters and the operation trend during operation. The effects of the method are that the air cooling unit can determine the fact that the electronic expansion valve is at a reasonable valve regulation initial open degree in different working conditions; during operation, over regulation of the electronic expansion valve can be avoided, and vibration can be relieved; and the electronic expansion valve can rapidly match a system, mass flow rate of the system is optimized, an optimal working state of a compressor of the unit can be ensured, and the best performance of the system can be achieved.
Description
Technical field
The present invention relates to air-conditioning expansion valve, more particularly, to a kind of electronic expansion valve controls side of air-cooled unit
Method.
Background technology
In air-conditioning equipment, generally air-conditioning equipment is adjusted using the method controlling the compressor air suction degree of superheat
The the opening or closing, so that equipment can normally run of internal electron expansion valve.Typically inhale actual
When the gas degree of superheat is more than degree of superheat desired value, the aperture of electric expansion valve increases；Actual suction superheat
During less than degree of superheat desired value, the aperture of electric expansion valve reduces；It is overheated that actual suction superheat is equal to
During degree desired value, the aperture of electric expansion valve is constant.At present, electric expansion valve suction superheat controls
Need to detect that suction temperature and two variables of pressure of inspiration(Pi) cause exhaust it may appear that suction superheat is too high
Temperature is too high to lead to carbon deposition phenomenon, and impact unit overall performance is it is impossible to give full play to electric expansion valve essence
The effect of details stream.
Content of the invention
In view of this, in order to solve to exist in prior art, suction superheat is too high, too low vibration causes
Electric expansion valve is poor with system followability, the problem of impact unit overall performance, and the purpose of the present invention is
A kind of control method for electronic expansion valve of air-cooled unit is proposed.For some sides to the embodiment disclosing
There is a basic understanding in face, shown below is simple summary.This summarized section is not extensive overview,
It is not the protection domain that will determine key/critical component or describe these embodiments.It is unique
Purpose is to assume some concepts with simple form, in this, as the preamble of following detailed description.
In some optional embodiments, methods described, including：In running, according to operation
Parameter and operation trend are adjusted to the aperture of described electric expansion valve.
In some optional embodiments, before operation, also include：Determine degree of superheat desired value T and
The initial opening that electric expansion valve runs.
In some optional embodiments, described determination degree of superheat desired value T and electric expansion valve run
Initial opening, including：
According to unit operation pattern and ambient temperature signal, determine described T；
Described electronic expansion is determined according to unit operation pattern, ambient temperature signal and return water temperature signal
The initial opening of valve.
In some optional embodiments, described operational factor includes：Suction pressure of compressor and compression
Machine suction temperature.
In some optional embodiments, described determination degree of superheat desired value T and electric expansion valve run
Initial opening, including：
Gather described ambient temperature signal and return water temperature signal；
According to described ambient temperature signal, corresponding in the degree of superheat corresponding with described unit operation pattern
In relation, inquire about described T；
According to described unit operation pattern, ambient temperature signal and return water temperature signal, in initial opening
The initial opening of described electric expansion valve is inquired about in corresponding relation；
Wherein, described degree of superheat corresponding relation includes the suction superheat corresponding to varying environment temperature range
Degree；Described initial opening corresponding relation is included in different operational modes, environment temperature and return water temperature
The initial opening of the electric expansion valve corresponding to scope.
In some optional embodiments, according to operational factor, the aperture of described electric expansion valve is carried out
Adjust, including：
Continuous detection n group suction pressure of compressor and compressor air suction temperature；
According to described n group suction pressure of compressor, compressor air suction temperature and degree of superheat desired value T, according to
Secondary calculate n suction superheat deviation delta T', i.e. Δ T'1, Δ T'2..., Δ T'n；
According to n-th suction superheat deviation delta T'1, Δ T'2..., Δ T'nVariation tendency, determine institute
State the aperture of electric expansion valve.
In some optional embodiments, according to Δ T'1, Δ T'2..., Δ T'nVariation tendency, determine
The aperture of described electric expansion valve, including：
If Δ T'n=0, then the aperture of electric expansion valve remain unchanged；
If Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nTaper off trend, then electric expansion valve
Aperture remains unchanged；
If Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation or increasing trend, then electronics
Expansion valve closes valve, and according to Δ T'nDetermine its aperture；
If Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in increasing trend, then electric expansion valve
Aperture remain unchanged；
If Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation, decline trend, then electronics
Expansion valve valve opening, and according to Δ T'nDetermine its aperture.
In some optional embodiments, in running, according to adjusting, the valve cycle is swollen to described electronics
The aperture of swollen valve is adjusted；Wherein, the described tune valve cycle is default, artificial setting, or root
Determine according to the feature of current machine set system.
In some optional embodiments, the described tune valve cycle is determined according to the feature of current machine set system,
Including：
According to the operational mode of current machine set system, determine the described tune valve cycle.
Using above-described embodiment, can reach following effect：
Unit can run under different operating modes, determines that electric expansion valve is located at rational tune valve initial
Aperture；
In running, it is to avoid electric expansion valve toning, reduce vibration, make electric expansion valve faster with
System matches, realize mass of system flow optimum it is ensured that the optimum performance of machine set compressor, are can be optimal.
For above-mentioned and related purpose, one or more embodiments include will be explained in simultaneously below
The feature being particularly pointed out in the claims.Description below and accompanying drawing detailed description are some exemplary
Aspect, and its instruction be only each embodiment the utilizable various modes of principle in one
A little modes.Other benefits and novel features will be considered in conjunction with the accompanying with detailed description below and
Become obvious, the disclosed embodiments are intended to including all these aspects and theirs is equivalent.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the one of the application
Part, the schematic description and description of the present invention is used for explaining the present invention, does not constitute to this
Bright improper restriction.In the accompanying drawings：
Fig. 1 shows a kind of flow process of air-cooled unit control method for electronic expansion valve of the embodiment of the present invention
Schematic diagram；
Fig. 2 shows a kind of the concrete of air-cooled unit control method for electronic expansion valve of the embodiment of the present invention
Schematic flow sheet.
Specific embodiment
The following description and drawings fully illustrate specific embodiments of the present invention, so that the skill of this area
Art personnel can put into practice them.Other embodiments can include structure, logic, electric,
Process and other changes.Embodiment only represents possible change.Unless explicitly requested, otherwise
Individually components and functionality is optional, and the order operating can change.Some embodiments
Part and feature can be included in or replace part and the feature of other embodiments.The reality of the present invention
The scope applying scheme includes the gamut of claims, and all of claims obtain
Equivalent.Herein, these embodiments of the present invention can individually or generally be used term
" invention " representing, it is convenient that this is used for the purpose of, and if in fact disclosing the invention more than,
The scope being not meant to automatically limit this application is any single invention or inventive concept.
In some optional embodiments, a kind of control method for electronic expansion valve of air-cooled unit, including：
In running, according to operational factor and operation trend, the aperture of described electric expansion valve is adjusted
Section；
In the prior art, the electric expansion valve of general air-conditioning air-cooled unit is only to lean on suction superheat poor
To control opening or closing of electric expansion valve, to control electronics swollen using so single parameter index
The folding of swollen valve can make air-conditioner set easily occur in actual use suction superheat too high,
Too low vibration causes electric expansion valve and system followability difference it is impossible to effectively realize degree of superheat control, shadow
Ring unit overall performance.In the method, by operational factor it will be seen that the current fortune of air-conditioner set
Row state, and operation trend has reacted compressor dynamic ruuning situation within nearly a period of time, foundation
Operational factor in air-conditioner set running and operation trend, can more effectively, more accurately to electricity
The aperture of sub- expansion valve is adjusted；
In some optional embodiments, before operation, also include：Determine degree of superheat desired value T and
The initial opening that electric expansion valve runs；
Fig. 1 is that in the embodiment of the present invention, a kind of flow process of the control method for electronic expansion valve of air-cooled unit is shown
It is intended to；As shown in figure 1, methods described includes：
S101, according to unit operation pattern and ambient temperature signal, determines described T；
S102, determines described electricity according to unit operation pattern, ambient temperature signal and return water temperature signal
The initial opening of sub- expansion valve；
S103, in running, according to operational factor and operation trend to described electric expansion valve
Aperture is adjusted；
Further, the described initial opening determining degree of superheat desired value T and electric expansion valve operation,
Including：
Gather described ambient temperature signal and return water temperature signal；
According to described ambient temperature signal, corresponding in the degree of superheat corresponding with described unit operation pattern
In relation, inquire about described T；
According to described unit operation pattern, ambient temperature signal and return water temperature signal, in initial opening
The initial opening of described electric expansion valve is inquired about in corresponding relation；
Wherein, described degree of superheat corresponding relation includes the suction superheat corresponding to varying environment temperature range
Degree；Described initial opening corresponding relation is included in different operational modes, environment temperature and return water temperature
The initial opening of the electric expansion valve corresponding to scope；
In some optional embodiments, described operational factor includes：Suction pressure of compressor and compression
Machine suction temperature；
Further, according to operational factor, the aperture of described electric expansion valve is adjusted, including：
Continuous detection n group suction pressure of compressor and compressor air suction temperature；
According to described n group suction pressure of compressor, compressor air suction temperature and degree of superheat desired value T, according to
Secondary calculate n suction superheat deviation delta T', i.e. Δ T'1, Δ T'2..., Δ T'n；
According to n-th suction superheat deviation delta T'1, Δ T'2..., Δ T'nVariation tendency, determine institute
State the aperture of electric expansion valve；
Further, according to Δ T'1, Δ T'2..., Δ T'nVariation tendency, determine described electronic expansion
The aperture of valve, including：
If Δ T'n=0, then the aperture of electric expansion valve remain unchanged；
If Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nTaper off trend, then electric expansion valve
Aperture remains unchanged；
If Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation or increasing trend, then electronics
Expansion valve closes valve, and according to Δ T'nDetermine its aperture；
If Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in increasing trend, then electric expansion valve
Aperture remain unchanged；
If Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation, decline trend, then electronics
Expansion valve valve opening, and according to Δ T'nDetermine its aperture；
In some optional embodiments, in running, according to adjusting, the valve cycle is swollen to described electronics
The aperture of swollen valve is adjusted；Wherein, the described tune valve cycle is default, artificial setting, or root
Determine according to the feature of current machine set system；For example：When dispatching from the factory, the expansion valve of unit is adjusted the valve cycle
Be set to 20min, then the unit after unit brings into operation, then every 20min execute one time above-mentioned according to
The operation aperture of described electric expansion valve being adjusted according to operational factor and operation trend；Or,
Before system commencement of commercial operation, system can obtain according to the setting of user and adjust the valve cycle；Or, system according to
Current machine set system feature (the current operational mode of such as machine set system (heat, freeze, quiet
Sleep) or the current wind speed of air-conditioning etc.) determine the described tune valve cycle.
Fig. 2 is that in the embodiment of the present invention, a kind of flow process of the control method for electronic expansion valve of air-cooled unit is shown
It is intended to；As shown in Fig. 2 methods described includes：
S201, collection ambient temperature signal, return water temperature signal；
S202, determines degree of superheat desired value T and electric expansion valve initial opening；
S203, collection n group pressure of inspiration(Pi), suction temperature signal；
S204, calculates Δ T'nWith Δ T'1, Δ T'2..., Δ T'nVariation tendency；
S205, according to Δ T'nWith Δ T'1, Δ T'2..., Δ T'nVariation tendency determine how regulation electricity
Sub- expansion valve；Wherein, this step specifically includes：
S2051, if Δ T'n=0, then the aperture of electric expansion valve remain unchanged；
S2052, if Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nTaper off trend, then electronics is swollen
The aperture of swollen valve remains unchanged；
S2053, if Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation or increasing trend,
Then electric expansion valve closes valve, and according to Δ T'nDetermine its aperture；
S2054, if Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in increasing trend, then electronics
The aperture of expansion valve remains unchanged；
S2055, if Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation, decline trend,
Then electric expansion valve valve opening, and according to Δ T'nDetermine its aperture.
Below, in conjunction with specific embodiments the method described in Fig. 2 is described in detail：
Example：
Tables 1 and 2 is the degree of superheat mapping table under refrigeration and heating mode respectively, and this table is permissible
When dispatching from the factory preset in systems, or manually arranged by operation interface；According to table 1 He
Table 2 can determine corresponding degree of superheat desired value T；
Degree of superheat mapping table under table 1 refrigeration mode
| Segmentation principle | Degree of superheat desired value T (K) |
| 18～53 DEG C | 5 |
Degree of superheat mapping table under table 2 refrigeration mode
| Segmentation principle | Degree of superheat desired value T (K) |
| Ta≥5℃ | 5 |
| 5 DEG C of Ta ＜ | 2 |
Table 3 is the electric expansion valve initial opening table of comparisons, for machine set system according to current operation mould
Formula, environment temperature Ta and return water temperature Tewi determine electric expansion valve initial opening；
Table 3 is the electric expansion valve initial opening table of comparisons
Assume air-cooled unit in 38 DEG C of ring temperature, 18 DEG C of return water temperature starts refrigerating operatons, during startup according to
Operational mode (refrigeration), environment temperature, determine degree of superheat desired value T be 5K, after startup optimization
5 groups of parameters of detection in one tune valve cycle：
Pressure of inspiration(Pi) be respectively 0.510MPa, 0.509MPa, 0.508MPa, 0.507MPa,
0.507Mpa；
Suction temperature is respectively 12.68 DEG C, 12.52 DEG C, 12.37 DEG C, 12.22 DEG C, 12.12 DEG C；
According to the current suction superheat of the pressure of inspiration(Pi) detecting, temperature computation and suction superheat deviation
Δ T', detailed process is：
First saturation temperature (6.32 DEG C) is inquired according to pressure of inspiration(Pi) (as 0.507MPa)；
Secondly, calculate T=12.12-6.32=5.8 DEG C of Δ；
Calculate 0 DEG C of Δ T'=(12.12-6.32) -5=0.8 DEG C of ＞；
Same as mentioned above, calculate Δ T' change according to 5 groups of parameters of detection in the tune valve cycle and become
Gesture is：1.2,1.1,1.0,0.9 and 0.8；
Decline trend is judged as by above-mentioned Δ T' variation tendency；
According to 0 DEG C of Δ T'＞, and decline trend, then electric expansion valve maintains aperture.
Using above-described embodiment, can reach following effect：
Unit can run under different operating modes, determines that electric expansion valve is located at rational tune valve initial
Aperture；
In running, it is to avoid electric expansion valve toning, reduce vibration, make electric expansion valve faster with
System matches, realize mass of system flow optimum it is ensured that the optimum performance of machine set compressor, are can be optimal.
It should also be appreciated by one skilled in the art that combining the various illustrative of the embodiments herein description
Box, module, circuit and algorithm steps all can be implemented as electronic hardware, computer software or its
Combination.In order to clearly demonstrate the interchangeability between hardware and software, above to various illustrative
Part, frame, module, circuit and step are all generally described around its function.As for this
Function is implemented as hardware and is also implemented as software, is applied depending on specific application with to whole system
Plus design constraint.Those skilled in the art can be directed to each application-specific, with flexible side
Formula realizes described function, but, this realize decision-making and should not be construed as the protection deviating from the disclosure
Scope.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for
For those skilled in the art, the present invention can have various modifications and variations.All essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement made etc., should be included in the present invention
Protection domain within.
Claims (9)
1. a kind of group control method for electronic expansion valve of Air cooler is it is characterised in that include：
In running, according to operational factor and operation trend, the aperture of described electric expansion valve is entered
Row is adjusted.
2. the method for claim 1 is it is characterised in that before operation, also include：Determine
Degree of superheat desired value T and the initial opening of electric expansion valve operation.
3. method as claimed in claim 2 is it is characterised in that described determination degree of superheat desired value T
The initial opening running with electric expansion valve, including：
According to unit operation pattern and ambient temperature signal, determine described T；
Described electronic expansion is determined according to unit operation pattern, ambient temperature signal and return water temperature signal
The initial opening of valve.
4. the method for claim 1 is it is characterised in that described operational factor includes：Compression
Machine pressure of inspiration(Pi) and compressor air suction temperature.
5. method as claimed in claim 3 is it is characterised in that described determination degree of superheat desired value T
The initial opening running with electric expansion valve, including：
Gather described ambient temperature signal and return water temperature signal；
According to described ambient temperature signal, corresponding in the degree of superheat corresponding with described unit operation pattern
In relation, inquire about described T；
According to described unit operation pattern, ambient temperature signal and return water temperature signal, in initial opening
The initial opening of described electric expansion valve is inquired about in corresponding relation；
Wherein, described degree of superheat corresponding relation includes the suction superheat corresponding to varying environment temperature range
Degree；Described initial opening corresponding relation is included in different operational modes, environment temperature and return water temperature
The initial opening of the electric expansion valve corresponding to scope.
6. method as claimed in claim 4 is it is characterised in that foundation operational factor is to described electronics
The aperture of expansion valve is adjusted, including：
Continuous detection n group suction pressure of compressor and compressor air suction temperature；
According to described n group suction pressure of compressor, compressor air suction temperature and degree of superheat desired value T, according to
Secondary calculate n suction superheat deviation delta T', i.e. Δ T'1, Δ T'2..., Δ T'n；
According to n-th suction superheat deviation delta T'1, Δ T'2..., Δ T'nVariation tendency, determine institute
State the aperture of electric expansion valve.
7. method as claimed in claim 6 is it is characterised in that according to Δ T'1, Δ T'2..., Δ T'n
Variation tendency, determine the aperture of described electric expansion valve, including：
If Δ T'n=0, then the aperture of electric expansion valve remain unchanged；
If Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nTaper off trend, then electric expansion valve
Aperture remains unchanged；
If Δ T'n＞ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation or increasing trend, then electronics
Expansion valve closes valve, and according to Δ T'nDetermine its aperture；
If Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in increasing trend, then electric expansion valve
Aperture remain unchanged；
If Δ T'n＜ 0, and Δ T'1, Δ T'2..., Δ T'nDuring in fluctuation, decline trend, then electronics
Expansion valve valve opening, and according to Δ T'nDetermine its aperture.
8. the method as any one of claim 1-7 is it is characterised in that in running,
According to the tune valve cycle, the aperture of described electric expansion valve is adjusted；Wherein, described tune the valve cycle be
Default, artificial setting, or determined according to the feature of current machine set system.
9. method as claimed in claim 8 is it is characterised in that feature according to current machine set system
Determine the described tune valve cycle, including：
According to the operational mode of current machine set system, determine the described tune valve cycle.
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| CN201510447302.8A CN106403140B (en) | 2015-07-27 | 2015-07-27 | A kind of control method for electronic expansion valve of air-cooled unit |
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| CN201510447302.8A CN106403140B (en) | 2015-07-27 | 2015-07-27 | A kind of control method for electronic expansion valve of air-cooled unit |
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| CN107062556A (en) * | 2017-05-11 | 2017-08-18 | 广东志高暖通设备股份有限公司 | A kind of control method of refrigerant flow of module water dispenser |
| CN107289594A (en) * | 2017-07-24 | 2017-10-24 | 珠海格力电器股份有限公司 | Air-conditioner set, airconditioning control network and air conditioning control method |
| CN107606830A (en) * | 2017-09-05 | 2018-01-19 | 浙江正理生能科技有限公司 | A kind of electric expansion valve adjusting method |
| CN109579348A (en) * | 2018-12-04 | 2019-04-05 | 宁波工程学院 | The multi-functional multi-joint dry type capillary radiation heat pump unit of one kind and its control method |
| CN112050498A (en) * | 2020-09-16 | 2020-12-08 | 浙江正理生能科技有限公司 | Defrosting method for heat pump unit |
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| CN112050498A (en) * | 2020-09-16 | 2020-12-08 | 浙江正理生能科技有限公司 | Defrosting method for heat pump unit |
| CN112050498B (en) * | 2020-09-16 | 2022-02-18 | 浙江正理生能科技有限公司 | Defrosting method for heat pump unit |
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| CN106403140B (en) | 2019-05-24 |
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