CN105004115A - Control method for electronic expansion valve - Google Patents
Control method for electronic expansion valve Download PDFInfo
- Publication number
- CN105004115A CN105004115A CN201510325059.2A CN201510325059A CN105004115A CN 105004115 A CN105004115 A CN 105004115A CN 201510325059 A CN201510325059 A CN 201510325059A CN 105004115 A CN105004115 A CN 105004115A
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- China
- Prior art keywords
- expansion valve
- discharge superheat
- setting
- aperture
- electric expansion
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
Abstract
The embodiment of the invention discloses a control method for an electronic expansion valve. The method includes the steps that at least two temperature parameters and/or pressure parameters of key positions of refrigerants in the refrigeration cycle are collected; and the opening degree regulation action, corresponding to the action condition, of the electronic expansion valve is executed if the at least two temperature parameters and the pressure parameters of the key positions meet the preset action condition. According to the control method for the electronic expansion valve, the temperature and pressure parameters of the key positions in the refrigeration cycle are collected, the opening degree control of the electronic expansion valve is implemented by combining the temperature and pressure parameters of the key positions, and therefore the control failure problem generated when the opening degree control is implemented according to a single parameter is effectively solved.
Description
Technical field
The embodiment of the present invention relates to heat pump assembly technical field, particularly relates to a kind of control method of electric expansion valve.
Background technology
Throttling arrangement in existing refrigeration system mainly comprises heating power expansion valve, throttle pipe and electric expansion valve.Wherein, compared to heating power expansion valve and capillary, electric expansion valve can be controlled by microprocessor due to it, and regulate and facilitate rapidly, flexible movements, are widely used in refrigeration systems.
The aperture control method of existing electric expansion valve comprises: according to suction superheat to regulate the method for electronic expansion valve opening, and regulate the method for electronic expansion valve opening according to the compressor air-discharging degree of superheat.For employing flooded evaporator, its suction superheat very low.Easily there is absorbing gas belt liquid in the control according to suction superheat, or the phenomenon of electric expansion valve feed flow deficiency; Control according to discharge superheat, the characteristic etc. of the load of discharge superheat and compressor, the operating mode of unit, compressor has relation, the desired value of discharge superheat cannot be determined accurately, there will be the phenomenon of the not enough or overfeeding of feed flow before expansion valve, thus occur controlling failure conditions.
Trace it to its cause, be mainly that the existing aperture control method being applied to electric expansion valve is all only rely on system parameter to control to perform aperture, therefore occur that aperture controls unavoidably accurate not, control the situation of actual effect.
Summary of the invention
In view of this, the embodiment of the present invention proposes a kind of control method of electric expansion valve, to avoid the situation carrying out controlling when aperture controls actual effect according to single parameter.
Embodiments provide a kind of control method of electric expansion valve, described method comprises:
Gather at least two temperature parameters of cold-producing medium in kind of refrigeration cycle on key position and/or pressure parameter;
If at least two temperature parameters on described key position and/or pressure parameter meet default operation condition, the aperture performing the electric expansion valve corresponding with described operation condition regulates action.
The control method of the electric expansion valve that the embodiment of the present invention provides, by gathering at least two temperature parameters of cold-producing medium in kind of refrigeration cycle on key position and/or pressure parameter, and when at least two temperature parameters on described key position and/or pressure parameter meet default operation condition, the aperture performing the electric expansion valve corresponding with described operation condition regulates action, thus control based on the aperture of multiple parameters execution electric expansion valves of key position multiple in kind of refrigeration cycle, effectively avoiding aperture controls accurate not, even control the situation of actual effect.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the structural representation of the kind of refrigeration cycle of the control method of the described electric expansion valve of application that the embodiment of the present invention provides;
Fig. 2 is the schematic flow sheet of the control method of the electric expansion valve that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.
Embodiments provide a kind of technical scheme of the control method of electric expansion valve.The control method of described electric expansion valve is applied in the kind of refrigeration cycle of refrigeration system.See Fig. 1, described kind of refrigeration cycle comprises: compressor 1, oil eliminator 2, finned heat exchanger 3, blower fan 4, ball valve 5, device for drying and filtering 6, economizer 7, electric expansion valve 8, full-liquid type shell-tube evaporator 9, gas-liquid separator 10.In this technical scheme, the control method of described electric expansion valve comprises: gather at least two temperature parameters of cold-producing medium in kind of refrigeration cycle on key position and/or pressure parameter; If at least two temperature parameters on described key position and/or pressure parameter meet default operation condition, the aperture performing the electric expansion valve corresponding with described operation condition regulates action.
See Fig. 2, the control method of described electric expansion valve comprises:
S21, gathers at least two temperature parameters of cold-producing medium in kind of refrigeration cycle on key position and/or pressure parameter.
In the present embodiment, by set temperature sensor and/or pressure sensor on several key positions of described kind of refrigeration cycle, the temperature parameter on described key position and/or pressure parameter is gathered.The quantity of described key position is at least two.Further, described key position comprises: condensator outlet, compressor air suction mouth and exhaust outlet of compressor.
Described temperature parameter comprises: condensator outlet temperature T1, compressor air suction mouth temperature T2, exhaust outlet of compressor temperature T3, condensator outlet degree of supercooling Δ T1, compressor air suction degree of superheat Δ T2 and compressor air-discharging degree of superheat Δ T3.
Described condensator outlet degree of supercooling Δ T1 refers to the difference between the saturation temperature that condensing pressure is corresponding and condensator outlet temperature T1.Described compressor air suction degree of superheat Δ T2 refers to the difference between the saturation temperature that described compressor air suction mouth temperature T2 is corresponding with compressor air suction mouth pressure.Described compressor air-discharging degree of superheat Δ T3 refers to the difference between the saturation temperature that described exhaust outlet of compressor temperature T3 is corresponding with compressor air-discharging mouth pressure.
Described pressure parameter comprises: condensator outlet pressure, low pressure and high-pressure.Wherein, described low pressure is exactly compressor air suction mouth pressure, and described high-pressure is exactly compressor air-discharging mouth pressure.
S22, if at least two temperature parameters on described key position and/or pressure parameter meet default operation condition, the aperture performing the electric expansion valve corresponding with described operation condition regulates action.
Described operation condition comprises: delivery temperature controlled condition, low voltage control condition, discharge superheat controlled condition, operation controlled condition.Further, the execution priority order of described operation condition is: delivery temperature controlled condition, low voltage control condition, discharge superheat controlled condition, operation controlled condition.
Concrete, described delivery temperature controlled condition comprises: the temperature of described exhaust outlet of compressor is greater than 100 DEG C in continuous 10 seconds, or the temperature of described exhaust outlet of compressor is not more than 95 DEG C in continuous 10 seconds.Aperture adjustment action corresponding to described delivery temperature controlled condition comprises: when the temperature of described exhaust outlet of compressor is greater than when 100 DEG C in continuous 10 seconds, do not allow the aperture of described electric expansion valve to turn down; And when the temperature of described exhaust outlet of compressor is not more than when 95 DEG C for continuous 10 seconds, allow the aperture of described electric expansion valve to turn down.
Described low voltage control condition comprises: the saturation temperature that described compressor air suction mouth pressure is corresponding is greater than the first setting saturation temperature threshold value for continuous 60 seconds, or saturation temperature corresponding to described compressor air suction mouth pressure is not more than the second setting saturation temperature threshold value for continuous 10 seconds.Aperture adjustment action corresponding to described low voltage control condition comprises: when the saturation temperature that described compressor air suction mouth pressure is corresponding is greater than the first setting saturation temperature threshold value in continuous 60 seconds, the aperture of described electric expansion valve is turned down the stride of the first setting percentage; And when the saturation temperature that described compressor air suction mouth pressure is corresponding is not more than the second setting saturation temperature threshold value in continuous 10 seconds, stop the action of the stride aperture of described electric expansion valve being turned down the first setting percentage.
The value of described second setting saturation temperature threshold value should be less than the value of described first setting saturation temperature threshold value.Further, preferably, the value of described second setting saturation temperature threshold value is lower two degrees Celsius than the value of described first setting saturation temperature threshold value.
Described discharge superheat controlled condition comprises: discharge superheat is not more than discharge superheat threshold value in continuous 60 seconds, or described discharge superheat section is greater than discharge superheat threshold value in continuous 10 seconds.Aperture adjustment action corresponding to described discharge superheat controlled condition comprises: when described discharge superheat is not more than discharge superheat threshold value in continuous 60 seconds, the aperture of described electric expansion valve is turned down the stride of the second setting percentage; And when described discharge superheat is greater than discharge superheat threshold value in continuous 10 seconds, stop the action of the stride aperture of described electric expansion valve being turned down the second setting percentage.
Described operation controlled condition comprises: the discharge superheat upper limit threshold that condensator outlet degree of supercooling is greater than the condensator outlet degree of supercooling upper limit threshold of setting, discharge superheat is greater than setting, condensator outlet degree of supercooling are not more than the discharge superheat lower threshold that the condensator outlet degree of supercooling lower threshold of setting or discharge superheat are not more than setting.
Aperture adjustment action corresponding to described operation controlled condition comprises: when condensator outlet degree of supercooling is greater than the condensator outlet degree of supercooling upper limit threshold of setting, the aperture of described electric expansion valve is opened the stride of large 3rd setting percentage; When discharge superheat is greater than the discharge superheat upper limit threshold of setting, the aperture of described electric expansion valve is opened the stride of large 3rd setting percentage; When condensator outlet degree of supercooling is not more than the condensator outlet degree of supercooling lower threshold of setting, the aperture of described electric expansion valve is turned down the stride of the 4th setting percentage; And when discharge superheat is not more than the discharge superheat lower threshold of setting, the aperture of described electric expansion valve is turned down the stride of the 4th setting percentage.
Although word " first ", " second " etc. can be used for describing various parameter in this article, these parameters should by the restriction of these words.These words are only for separating a parameter and another parameter region.Also will understand, word " comprise " and/or " comprising " with time in this manual, represent the existence of described feature, operation, element and/or assembly, but do not get rid of other features one or more, element, the existence of assembly and/or its combination or interpolation.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, to those skilled in the art, the present invention can have various change and change.All do within spirit of the present invention and principle any amendment, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a control method for electric expansion valve, is characterized in that, comprising:
Gather at least two temperature parameters of cold-producing medium in kind of refrigeration cycle on key position and/or pressure parameter;
If at least two temperature parameters on described key position and/or pressure parameter meet default operation condition, the aperture performing the electric expansion valve corresponding with described operation condition regulates action.
2. method according to claim 1, is characterized in that, described key position comprises: condensator outlet, compressor air suction mouth and exhaust outlet of compressor;
Described operation condition comprises: delivery temperature controlled condition, low voltage control condition, discharge superheat controlled condition, operation controlled condition.
3. method according to claim 2, is characterized in that, the execution priority order of described operation condition is: delivery temperature controlled condition, low voltage control condition, discharge superheat controlled condition, operation controlled condition.
4. according to the method in claim 2 or 3, it is characterized in that, described delivery temperature controlled condition comprises: the temperature of described exhaust outlet of compressor is greater than 100 DEG C in continuous 10 seconds, or the temperature of described exhaust outlet of compressor is not more than 95 DEG C in continuous 10 seconds;
Aperture adjustment action corresponding to described delivery temperature controlled condition comprises: when the temperature of described exhaust outlet of compressor is greater than when 100 DEG C in continuous 10 seconds, do not allow the aperture of described electric expansion valve to turn down; And
When the temperature of described exhaust outlet of compressor is not more than when 95 DEG C for continuous 10 seconds, allow the aperture of described electric expansion valve to turn down.
5. according to the method in claim 2 or 3, it is characterized in that, described low voltage control condition comprises: the saturation temperature that described compressor air suction mouth pressure is corresponding is greater than the first setting saturation temperature threshold value for continuous 60 seconds, or saturation temperature corresponding to described compressor air suction mouth pressure is not more than the second setting saturation temperature threshold value for continuous 10 seconds;
Aperture adjustment action corresponding to described low voltage control condition comprises: when the saturation temperature that described compressor air suction mouth pressure is corresponding is greater than the first setting saturation temperature threshold value in continuous 60 seconds, the aperture of described electric expansion valve is turned down the stride of the first setting percentage; And
When the saturation temperature that described compressor air suction mouth pressure is corresponding is not more than the second setting saturation temperature threshold value in continuous 10 seconds, stop the action of the stride aperture of described electric expansion valve being turned down the first setting percentage.
6. according to the method in claim 2 or 3, it is characterized in that, described discharge superheat controlled condition comprises: discharge superheat is not more than discharge superheat threshold value in continuous 60 seconds, or described discharge superheat section is greater than discharge superheat threshold value in continuous 10 seconds;
Aperture adjustment action corresponding to described discharge superheat controlled condition comprises: when described discharge superheat is not more than discharge superheat threshold value in continuous 60 seconds, the aperture of described electric expansion valve is turned down the stride of the second setting percentage; And
When described discharge superheat is greater than discharge superheat threshold value in continuous 10 seconds, stop the action of the stride aperture of described electric expansion valve being turned down the second setting percentage.
7. according to the method in claim 2 or 3, it is characterized in that, described operation controlled condition comprises: the discharge superheat upper limit threshold that condensator outlet degree of supercooling is greater than the condensator outlet degree of supercooling upper limit threshold of setting, discharge superheat is greater than setting, condensator outlet degree of supercooling are not more than the discharge superheat lower threshold that the condensator outlet degree of supercooling lower threshold of setting or discharge superheat are not more than setting;
Aperture adjustment action corresponding to described operation controlled condition comprises: when condensator outlet degree of supercooling is greater than the condensator outlet degree of supercooling upper limit threshold of setting, the aperture of described electric expansion valve is opened the stride of large 3rd setting percentage;
When discharge superheat is greater than the discharge superheat upper limit threshold of setting, the aperture of described electric expansion valve is opened the stride of large 3rd setting percentage;
When condensator outlet degree of supercooling is not more than the condensator outlet degree of supercooling lower threshold of setting, the aperture of described electric expansion valve is turned down the stride of the 4th setting percentage;
When discharge superheat is not more than the discharge superheat lower threshold of setting, the aperture of described electric expansion valve is turned down the stride of the 4th setting percentage.
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| CN201510325059.2A CN105004115B (en) | 2015-06-12 | 2015-06-12 | The control method of electric expansion valve |
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| CN201510325059.2A CN105004115B (en) | 2015-06-12 | 2015-06-12 | The control method of electric expansion valve |
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| CN105004115A true CN105004115A (en) | 2015-10-28 |
| CN105004115B CN105004115B (en) | 2017-12-29 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106871476A (en) * | 2017-02-17 | 2017-06-20 | 珠海格力电器股份有限公司 | The control method and device of a kind of net for air-source heat pump units and its electric expansion valve |
| CN107289696A (en) * | 2017-06-19 | 2017-10-24 | 青岛海尔空调电子有限公司 | The control method of choke valve |
| CN107621102A (en) * | 2017-09-14 | 2018-01-23 | 南京天加环境科技有限公司 | A kind of method based on double degrees of superheat control electric expansion valve |
| CN108387019A (en) * | 2018-01-29 | 2018-08-10 | 珠海格力电器股份有限公司 | Air-conditioning system and its control method |
| CN109737572A (en) * | 2019-01-16 | 2019-05-10 | 奥克斯空调股份有限公司 | A kind of expansion valve control method and air conditioner |
| CN110307660A (en) * | 2019-06-26 | 2019-10-08 | 珠海格力电器股份有限公司 | Multi-stage compression air-conditioning system and its control method |
| CN111288696A (en) * | 2020-02-28 | 2020-06-16 | 贝莱特空调有限公司 | Control method of electronic expansion valve of falling film evaporator |
| CN111297178A (en) * | 2020-04-17 | 2020-06-19 | 青岛海尔智慧厨房电器有限公司 | Steam box and control method thereof |
| CN111322801A (en) * | 2020-02-27 | 2020-06-23 | 广东志高暖通设备股份有限公司 | Control method and device of electronic expansion valve |
| CN112460859A (en) * | 2020-12-10 | 2021-03-09 | 珠海格力电器股份有限公司 | Water chilling unit and control method thereof |
| CN116025964A (en) * | 2022-12-29 | 2023-04-28 | 珠海格力电器股份有限公司 | Heat pump unit and cooling control method for variable frequency module of heat pump unit |
| CN116025964B (en) * | 2022-12-29 | 2024-05-03 | 珠海格力电器股份有限公司 | Heat pump unit and cooling control method for variable frequency module of heat pump unit |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106871476A (en) * | 2017-02-17 | 2017-06-20 | 珠海格力电器股份有限公司 | The control method and device of a kind of net for air-source heat pump units and its electric expansion valve |
| CN106871476B (en) * | 2017-02-17 | 2019-08-16 | 珠海格力电器股份有限公司 | The control method and device of a kind of net for air-source heat pump units and its electric expansion valve |
| CN107289696A (en) * | 2017-06-19 | 2017-10-24 | 青岛海尔空调电子有限公司 | The control method of choke valve |
| CN107621102A (en) * | 2017-09-14 | 2018-01-23 | 南京天加环境科技有限公司 | A kind of method based on double degrees of superheat control electric expansion valve |
| CN107621102B (en) * | 2017-09-14 | 2019-09-24 | 南京天加环境科技有限公司 | A method of electric expansion valve is controlled based on double degrees of superheat |
| CN108387019A (en) * | 2018-01-29 | 2018-08-10 | 珠海格力电器股份有限公司 | Air-conditioning system and its control method |
| CN108387019B (en) * | 2018-01-29 | 2019-09-24 | 珠海格力电器股份有限公司 | Air-conditioning system and its control method |
| CN109737572A (en) * | 2019-01-16 | 2019-05-10 | 奥克斯空调股份有限公司 | A kind of expansion valve control method and air conditioner |
| CN110307660A (en) * | 2019-06-26 | 2019-10-08 | 珠海格力电器股份有限公司 | Multi-stage compression air-conditioning system and its control method |
| CN110307660B (en) * | 2019-06-26 | 2020-06-09 | 珠海格力电器股份有限公司 | Multi-stage compression air conditioning system and control method thereof |
| CN111322801A (en) * | 2020-02-27 | 2020-06-23 | 广东志高暖通设备股份有限公司 | Control method and device of electronic expansion valve |
| CN111322801B (en) * | 2020-02-27 | 2021-05-11 | 广东志高暖通设备股份有限公司 | Control method and device of electronic expansion valve |
| CN111288696A (en) * | 2020-02-28 | 2020-06-16 | 贝莱特空调有限公司 | Control method of electronic expansion valve of falling film evaporator |
| CN111297178A (en) * | 2020-04-17 | 2020-06-19 | 青岛海尔智慧厨房电器有限公司 | Steam box and control method thereof |
| CN111297178B (en) * | 2020-04-17 | 2022-03-29 | 青岛海尔智慧厨房电器有限公司 | Steam box and control method thereof |
| CN112460859A (en) * | 2020-12-10 | 2021-03-09 | 珠海格力电器股份有限公司 | Water chilling unit and control method thereof |
| CN116025964A (en) * | 2022-12-29 | 2023-04-28 | 珠海格力电器股份有限公司 | Heat pump unit and cooling control method for variable frequency module of heat pump unit |
| CN116025964B (en) * | 2022-12-29 | 2024-05-03 | 珠海格力电器股份有限公司 | Heat pump unit and cooling control method for variable frequency module of heat pump unit |
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