CN105805994A - Control method and control device used for expansion valve of compressor - Google Patents
Control method and control device used for expansion valve of compressor Download PDFInfo
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- CN105805994A CN105805994A CN201610260715.XA CN201610260715A CN105805994A CN 105805994 A CN105805994 A CN 105805994A CN 201610260715 A CN201610260715 A CN 201610260715A CN 105805994 A CN105805994 A CN 105805994A
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- Prior art keywords
- expansion valve
- aperture
- control
- described expansion
- reason
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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
- F25B49/022—Compressor control arrangements
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to the field of electric appliances and discloses a control method and control device used for an expansion valve of a compressor. The control method comprises the steps that the reason for the stopping of the compressor is obtained under the condition that the compressor stops; and the opening degree of the expansion valve is controlled according to the reason for the stopping of the compressor. In this way, the number of times that the expansion valve is reset can be decreased under the condition that an electric appliance operates normally, and the service life of the expansion valve is prolonged.
Description
Technical field
The present invention relates to appliance field, in particular it relates to the control method of a kind of expansion valve for compressor and control device.
Background technology
In the prior art; compressor is (such as; the compressor of air conditioner) when stopping; expansion valve is (such as; electric expansion valve) control be all change to cleared condition from the aperture before shutting down; reset and represent electronic expansion valve controls to be closed mode, close in order to ensure electric expansion valve, electric expansion valve can be controlled under normal circumstances and change to Y step.But reset the easy abrasion strengthening electric expansion valve that resets frequently, cause that electric expansion valve is stuck, thus significantly having shortened the service life of electric expansion valve.
Summary of the invention
It is an object of the invention to provide the control method of a kind of expansion valve for compressor and control device, this control method and control device when ensureing that electrical equipment is properly functioning, can reduce the number of times that expansion valve resets, extend the service life of expansion valve.
To achieve these goals, the present invention provides the control method of a kind of expansion valve for compressor, and this control method includes: when described compressor stops, and obtains the reason that described compressor stops；And the reason stopped according to described compressor controls the aperture of described expansion valve.
Preferably, when the reason that described compressor stops be temperature reach design temperature, the reason stopped according to described compressor controls the aperture of described expansion valve and includes: when described compressor continuous operating time is more than first scheduled time, controls described expansion valve and changes to standby aperture；And when described compressor continuous operating time is not more than described first scheduled time, controls described expansion valve and change to presetting aperture, described default aperture is less than described standby aperture.
Preferably, described temperature is water temperature and/or ambient temperature.
Preferably; when the reason that described compressor stops is high pressure and/or aerofluxus protection is shut down; the reason stopped according to described compressor controls the aperture of described expansion valve and includes: when high pressure and/or aerofluxus protect recover, control described expansion valve and change to standby aperture.
Preferably, when high pressure and/or aerofluxus protect recovery, described control method includes: judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
Preferably, described control method also include following at least one: when high pressure and/or aerofluxus are protected and shut down, control described expansion valve and change to maximum opening；And through the 3rd scheduled time after high pressure and/or aerofluxus protect recovery, it is judged that within described second scheduled time, whether the clearing number of times of described expansion valve exceedes described preset times.
Preferably; when the reason that described compressor stops is not that temperature reaches design temperature and high pressure and/or aerofluxus protection is shut down, the reason stopped according to described compressor controls the aperture of described expansion valve and includes: controls described expansion valve and changes to standby aperture.
Preferably, control the change of described expansion valve to include to standby aperture: judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
Preferably, described control method also includes: when described expansion valve is cleared, control counter adds 1；And when the complete machine operation time reaches described second scheduled time, control described counter O reset.
Correspondingly, the present invention also provides for the control device of a kind of expansion valve for compressor, and this control device includes: acquisition module, when described compressor stops, obtaining the reason that described compressor stops；And control module, the reason for stopping according to described compressor controls the aperture of described expansion valve.
Preferably, when the reason that described compressor stops be temperature reach design temperature, the aperture that described control module controls described expansion valve according to the reason that described compressor stops includes: when described compressor continuous operating time is more than first scheduled time, controls described expansion valve and changes to standby aperture；And when described compressor continuous operating time is not more than described first scheduled time, controls described expansion valve and change to presetting aperture, described default aperture is less than described standby aperture.
Preferably; when the reason that described compressor stops is high pressure and/or aerofluxus protection is shut down; the aperture that described control module controls described expansion valve according to the reason that described compressor stops includes: when high pressure and/or aerofluxus protect recovery, controls described expansion valve and changes to standby aperture.
Preferably, when high pressure and/or aerofluxus protect recovery, described control module is used for: judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
Preferably, described control module is additionally operable at least one in below execution: when high pressure and/or aerofluxus are protected and shut down, controls described expansion valve and changes to maximum opening；And through the 3rd scheduled time after high pressure and/or aerofluxus protect recovery, it is judged that within described second scheduled time, whether the clearing number of times of described expansion valve exceedes described preset times.
Preferably; not being that temperature reaches design temperature and high pressure and/or aerofluxus is protected when shutting down in the reason that described compressor stops, the aperture that described control module controls described expansion valve according to the reason that described compressor stops includes: controls described expansion valve and changes to standby aperture.
Preferably, the change of described control module control described expansion valve includes to standby aperture: judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
Preferably, described control device also includes enumerator, and described control module is additionally operable to: when described expansion valve is cleared, and controls described enumerator and adds 1；And when the complete machine operation time reaches described second scheduled time, control described counter O reset.
By technique scheme, the reason stopped according to described compressor controls the aperture of described expansion valve, it is possible to when ensureing that electrical equipment is properly functioning, reduces the number of times that expansion valve resets, extends the service life of expansion valve.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below.In the accompanying drawings:
Fig. 1 is the flow chart of the control method according to the expansion valve for compressor provided by the invention；
Fig. 2 is the flow chart of the control method of the expansion valve for compressor according to one embodiment of the present invention offer；And
Fig. 3 is the structural representation controlling device according to the expansion valve for compressor provided by the invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
Fig. 1 is the flow chart of the control method according to the expansion valve for compressor provided by the invention, as shown in Figure 1, control method for the expansion valve of compressor provided by the invention may include that in step 10 place, when described compressor stops, obtaining the reason that described compressor stops；And in step 11 place, the reason stopped according to described compressor controls the aperture of described expansion valve.So when ensureing that electrical equipment is properly functioning, the number of times that expansion valve resets can be reduced, extends the service life of expansion valve.
The reason that compressor stops can being divided into: temperature reaches design temperature, and described temperature can be water temperature and/or ambient temperature；High pressure and/or aerofluxus protection are shut down；Other (such as artificially shutdown).Different control modes is taked, in order to reduce the number of times that expansion valve resets, thus extending its service life for different reasons.
When the reason that described compressor stops be temperature reach design temperature, consider that the lubricating oil flowing to system after compressor operating certain time just can flow back into compressor, at described compressor continuous operating time, more than first scheduled time, (this first scheduled time can be arranged according to practical situation, to ensure that lubricating oil can flow back into compressor substantially) when, control described expansion valve and change to standby aperture；And when described compressor continuous operating time is not more than described first scheduled time, owing to parts of lubricating oil still remains in system, in order to when being again started up, less lubrication is brought into system by liquid refrigerants, described expansion valve can be controlled change to presetting aperture, and make described default aperture less than described standby aperture.
When the reason that described compressor stops is high pressure and/or aerofluxus protection is shut down; in order to avoid system pressure is higher, expansion valve is produced greater impact; when high pressure and/or aerofluxus protect recover, system controls described expansion valve again when being in the relatively low state of pressure and changes to standby aperture.
In a period of time, if the clearing number of times of expansion valve is excessive, it will expansion valve to be caused great infringement.Therefore when high pressure and/or aerofluxus protect recovery, it is judged that within second scheduled time, whether the clearing number of times of described expansion valve exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
When high pressure and/or aerofluxus are protected and are shut down, described control method also include following at least one: described expansion valve can be controlled and change to maximum opening, in order to accelerate system decompression；And system is in low-pressure state when resetting in order to ensure expansion valve, through the 3rd scheduled time after high pressure and/or aerofluxus protect recovery, it is judged that within described second scheduled time, whether the clearing number of times of described expansion valve exceedes described preset times.
When the reason that described compressor stops is not that temperature reaches design temperature and high pressure and/or aerofluxus protection is shut down, the reason stopped according to described compressor controls the aperture of described expansion valve and may include that the described expansion valve of control changes to standby aperture.In a period of time, if the clearing number of times of expansion valve is excessive, it will expansion valve to be caused great infringement.Therefore may determine that whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
Described control method also includes: when described expansion valve is cleared, control counter adds 1；And when the complete machine operation time reaches described second scheduled time, control described counter O reset, in order to ensure that expansion valve will not produce too much clearing number of times within a predetermined period of time.This second scheduled time can also be complete machine run and time of not running and.
Below with reference to Fig. 2, the present invention is described in detail, it is to be noted however that the present invention is not restricted to this.
As in figure 2 it is shown, in compressor operating process, in step 201 place, whether detection compressor stops；After detecting that compressor stops, in step 202 place, it is judged that shut down and whether cause owing to temperature reaches design temperature；If it is, in step 203 place, it is judged that whether the time that compressor runs continuously is more than A minute；If the time that compressor runs continuously was more than A minute, then in step 205 place, control expansion valve and change to standby aperture from current aperture；If the time that compressor runs continuously is not more than A minute, then in step 204 place, controlling expansion valve and change to default aperture from current aperture, the little X step of this standby aperture of default opening ratio, X can be configured as the case may be.
If shutdown is not due to temperature and reaches design temperature and cause, then in step 206 place, it is judged that whether shut down is high pressure and/or aerofluxus protection shutdown；If it is, in step 207 place, control expansion valve and change to maximum opening from current aperture；Then in step 208 place, it is judged that whether high pressure and/or aerofluxus protection recovered and through B minute；If high pressure and/or aerofluxus protection recovered and through B minute, then in step 209 place, it is judged that in C hour, expansion valve resets whether number of times exceedes n times；If expansion valve clearing number of times exceedes n times in C hour, then in step 210 place, control expansion valve and change to standby aperture from current aperture (maximum opening), do not reset therebetween；If expansion valve resets number of times not less than n times in C hour, then in step 211 place, control to change to standby aperture after expansion valve resets；Then in step 212 place, enumerator adds 1；In step 213 place, the time reaches C hour, counter O reset.
If shutting down is not high pressure and/or aerofluxus protection shutdown, then go to step 209 place, it is judged that in C hour, expansion valve resets whether number of times exceedes n times；If expansion valve clearing number of times exceedes n times in C hour, then in step 210 place, control expansion valve and change to standby aperture from current aperture, do not reset therebetween；If expansion valve resets number of times not less than n times in C hour, then in step 211 place, control to change to standby aperture after expansion valve resets；Then in step 212 place, enumerator adds 1；In step 213 place, the time reaches C hour, counter O reset.
Correspondingly, the present invention also provides for the control device of a kind of expansion valve for compressor, as it is shown on figure 3, control device provided by the invention may include that acquisition module 31, when described compressor stops, obtaining the reason that described compressor stops；And controlling module 31, the reason for stopping according to described compressor controls the aperture of described expansion valve.So when ensureing that electrical equipment is properly functioning, the number of times that expansion valve resets can be reduced, extends the service life of expansion valve.
When the reason that described compressor stops be temperature reach design temperature, consider that the lubricating oil flowing to system after compressor operating certain time just can flow back into compressor, described control module 32, when described compressor continuous operating time is more than first scheduled time, controls described expansion valve and changes to standby aperture；And when described compressor continuous operating time is not more than described first scheduled time, owing to parts of lubricating oil still remains in system, in order to when being again started up, less lubrication is brought into system by liquid refrigerants, described control module 32 can control described expansion valve and change to presetting aperture, and described default aperture is less than described standby aperture.
When the reason that described compressor stops is high pressure and/or aerofluxus protection is shut down; in order to avoid system pressure is higher, expansion valve is produced greater impact; when high pressure and/or aerofluxus protect recovery, described control module 32 can control described expansion valve and change to standby aperture.
In a period of time, if the clearing number of times of expansion valve is excessive, it will expansion valve to be caused great infringement.Therefore, when high pressure and/or aerofluxus protect recovery, described control module 32 may be used for: judges whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, described control module 32 can control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, described control module 32 can control to change to standby aperture after described expansion valve resets again.
When high pressure and/or aerofluxus are protected and shut down, described control module 32 is additionally operable at least one in below execution: when high pressure and/or aerofluxus are protected and shut down, controls described expansion valve and changes to maximum opening, in order to quickening system decompression；And system is in low-pressure state when resetting in order to ensure expansion valve, through the 3rd scheduled time after high pressure and/or aerofluxus protect recovery, it is judged that within described second scheduled time, whether the clearing number of times of described expansion valve exceedes described preset times.
Not being that temperature reaches design temperature and high pressure and/or aerofluxus is protected when shutting down in the reason that described compressor stops, the aperture that described control module 32 controls described expansion valve according to the reason that described compressor stops includes: controls described expansion valve and changes to standby aperture.In a period of time, if the clearing number of times of expansion valve is excessive, it will expansion valve to be caused great infringement.Therefore described control module 32 may determine that whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；When the clearing number of times of described expansion valve exceedes described preset times, described control module 32 can control described expansion valve and change to standby aperture；And when the clearing number of times of described expansion valve is not less than described preset times, described control module 32 can control to change to standby aperture after described expansion valve resets again.
Described control device also includes enumerator, and described control module 32 can be also used for: when described expansion valve is cleared, and controls described enumerator and adds 1；And when the complete machine operation time reaches described second scheduled time, control described counter O reset, in order to ensure that expansion valve will not produce too much clearing number of times within a predetermined period of time.This second scheduled time can also be complete machine run and time of not running and.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing; but; the present invention is not limited to the detail in above-mentioned embodiment; in the technology concept of the present invention; technical scheme can being carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to be combined by any suitable mode, in order to avoid unnecessary repetition, various possible compound modes are no longer illustrated by the present invention separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (17)
1. the control method for the expansion valve of compressor, it is characterised in that this control method includes:
When described compressor stops, obtaining the reason that described compressor stops；And
The reason stopped according to described compressor controls the aperture of described expansion valve.
2. control method according to claim 1, it is characterised in that when the reason that described compressor stops be temperature reach design temperature, the reason stopped according to described compressor controls the aperture of described expansion valve and includes:
When described compressor continuous operating time is more than first scheduled time, controls described expansion valve and change to standby aperture；And
When described compressor continuous operating time is not more than described first scheduled time, controlling described expansion valve and change to presetting aperture, described default aperture is less than described standby aperture.
3. control method according to claim 2, it is characterised in that described temperature is water temperature and/or ambient temperature.
4. control method according to claim 1, it is characterised in that when the reason that described compressor stops is high pressure and/or aerofluxus protection is shut down, the reason stopped according to described compressor controls the aperture of described expansion valve and includes:
When high pressure and/or aerofluxus protect recovery, control described expansion valve and change to standby aperture.
5. control method according to claim 4, it is characterised in that when high pressure and/or aerofluxus protect recovery, described control method includes:
Judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；
When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And
When the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
6. control method according to claim 5, it is characterised in that described control method also include following at least one:
When high pressure and/or aerofluxus are protected and shut down, control described expansion valve and change to maximum opening；And
Through the 3rd scheduled time after high pressure and/or aerofluxus protect recovery, it is judged that within described second scheduled time, whether the clearing number of times of described expansion valve exceedes described preset times.
7. control method according to claim 1; it is characterized in that; when the reason that described compressor stops is not that temperature reaches design temperature and high pressure and/or aerofluxus protection is shut down, the reason stopped according to described compressor controls the aperture of described expansion valve and includes: controls described expansion valve and changes to standby aperture.
8. control method according to claim 7, it is characterised in that control the change of described expansion valve and include to standby aperture:
Judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；
When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And
When the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
9. the control method according to claim 5 or 8, it is characterised in that described control method also includes:
When described expansion valve is cleared, control counter adds 1；And
When the complete machine operation time reaches described second scheduled time, control described counter O reset.
10. the control device for the expansion valve of compressor, it is characterised in that this control device includes:
Acquisition module, when described compressor stops, obtaining the reason that described compressor stops；And
Controlling module, the reason for stopping according to described compressor controls the aperture of described expansion valve.
11. control device according to claim 10, it is characterised in that when the reason that described compressor stops be temperature reach design temperature, the aperture that described control module controls described expansion valve according to the reason that described compressor stops includes:
When described compressor continuous operating time is more than first scheduled time, controls described expansion valve and change to standby aperture；And
When described compressor continuous operating time is not more than described first scheduled time, controlling described expansion valve and change to presetting aperture, described default aperture is less than described standby aperture.
12. control device according to claim 10; it is characterized in that; when the reason that described compressor stops is high pressure and/or aerofluxus protection is shut down, the aperture that described control module controls described expansion valve according to the reason that described compressor stops includes:
When high pressure and/or aerofluxus protect recovery, control described expansion valve and change to standby aperture.
13. control device according to claim 12, it is characterised in that when high pressure and/or aerofluxus protect recovery, described control module is used for:
Judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；
When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And
When the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
14. control device according to claim 13, it is characterised in that described control module is additionally operable at least one in below execution:
When high pressure and/or aerofluxus are protected and shut down, control described expansion valve and change to maximum opening；And
Through the 3rd scheduled time after high pressure and/or aerofluxus protect recovery, it is judged that within described second scheduled time, whether the clearing number of times of described expansion valve exceedes described preset times.
15. control device according to claim 10; it is characterized in that; not being that temperature reaches design temperature and high pressure and/or aerofluxus is protected when shutting down in the reason that described compressor stops, the aperture that described control module controls described expansion valve according to the reason that described compressor stops includes: controls described expansion valve and changes to standby aperture.
16. control device according to claim 15, it is characterised in that described control module controls the change of described expansion valve and includes to standby aperture:
Judge whether the clearing number of times of described expansion valve within second scheduled time exceedes preset times；
When the clearing number of times of described expansion valve exceedes described preset times, control described expansion valve and change to standby aperture；And
When the clearing number of times of described expansion valve is not less than described preset times, control to change again to standby aperture after described expansion valve resets.
17. the control device according to claim 13 or 16, it is characterised in that described control device also includes enumerator, and described control module is additionally operable to:
When described expansion valve is cleared, controls described enumerator and add 1；And
When the complete machine operation time reaches described second scheduled time, control described counter O reset.
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| CN201610260715.XA CN105805994B (en) | 2016-04-25 | 2016-04-25 | The control method and control device of a kind of expansion valve for compressor |
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| CN201610260715.XA CN105805994B (en) | 2016-04-25 | 2016-04-25 | The control method and control device of a kind of expansion valve for compressor |
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| CN108507246A (en) * | 2018-03-30 | 2018-09-07 | 北京新能源汽车股份有限公司 | Control method, device and the electronic equipment of heat pump air conditioning system |
| CN110542237A (en) * | 2019-09-12 | 2019-12-06 | 广东美的制冷设备有限公司 | Air conditioner, operation control method and device thereof and computer readable storage medium |
| CN112443883A (en) * | 2019-08-28 | 2021-03-05 | 青岛海尔新能源电器有限公司 | Electronic expansion valve control method and device and heat pump unit |
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| CN106705512B (en) * | 2016-12-29 | 2019-04-23 | 青岛海尔空调器有限总公司 | A kind of control method of refrigeration system and the control method of air-conditioning |
| CN108507246A (en) * | 2018-03-30 | 2018-09-07 | 北京新能源汽车股份有限公司 | Control method, device and the electronic equipment of heat pump air conditioning system |
| CN112443883A (en) * | 2019-08-28 | 2021-03-05 | 青岛海尔新能源电器有限公司 | Electronic expansion valve control method and device and heat pump unit |
| CN110542237A (en) * | 2019-09-12 | 2019-12-06 | 广东美的制冷设备有限公司 | Air conditioner, operation control method and device thereof and computer readable storage medium |
| CN110542237B (en) * | 2019-09-12 | 2021-03-30 | 广东美的制冷设备有限公司 | Air conditioner, operation control method and device thereof and computer readable storage medium |
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| CN105805994B (en) | 2018-09-07 |
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