CN104048388B - Control method and device and air conditioner - Google Patents
Control method and device and air conditioner Download PDFInfo
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- CN104048388B CN104048388B CN201410327961.3A CN201410327961A CN104048388B CN 104048388 B CN104048388 B CN 104048388B CN 201410327961 A CN201410327961 A CN 201410327961A CN 104048388 B CN104048388 B CN 104048388B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001704 evaporation Methods 0.000 claims abstract description 71
- 238000009833 condensation Methods 0.000 claims abstract description 38
- 230000005494 condensation Effects 0.000 claims abstract description 38
- 239000003507 refrigerant Substances 0.000 claims description 28
- 230000008020 evaporation Effects 0.000 abstract description 6
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Abstract
The embodiment of the invention discloses a control method, a control device and an air conditioner, wherein a first pressure value of an exhaust port of a compressor and a second pressure value of an air inlet are detected simultaneously, the first pressure value is converted into a corresponding first condensation temperature value, namely an actual condensation temperature, the second pressure value is converted into a corresponding evaporation temperature value, a maximum condensation temperature value corresponding to the evaporation temperature value is obtained, when the first condensation temperature value is larger than or equal to the maximum condensation temperature value, the actual pressure of the exhaust port of the compressor exceeds a high-pressure boundary value of a rated pressure range, the compressor is immediately controlled to stop, once the actual exhaust port pressure exceeds the high-pressure boundary value of the rated pressure range, the compressor is immediately stopped and protected, and the reliability of the compressor in stop protection is improved.
Description
Technical field
The present invention relates to air conditioner technical field, more specifically to a kind of control method, device and air conditioner.
Background technology
Compressor is the important composition part of refrigeration system in air conditioner, in order to ensure that air conditioner is normally run, compressor
Operating pressure value can not exceed its rated pressure scope, otherwise will cause the expendable failure of compressor, therefore, how
When the operating pressure of compressor exceeds rated pressure scope, compressor shutdown is controlled, to prevent compressor fault turns into from urgently solving
Certainly the problem of.
At present, the pressure of the exhaust outlet to prevent compressor causes compression beyond the high pressure boundary value of rated pressure scope
Machine failure, the method for more common control compressor shutdown is to detect exhaust outlet of compressor by the pressure switch of preset parameter value
Pressure value, when the pressure value that pressure switch detects exhaust outlet of compressor reaches the high pressure boundary value of rated pressure scope,
Control signal is sent, compressor shutdown is controlled.
But, in refrigeration systems, the condensation temperature of refrigerant was changed with the external load moment.Such as shade in Fig. 1
Shown in part, the different condensation temperature of correspondence, i.e. exhaust outlet of compressor pressure under same evaporating temperature.And because compressor itself
Reliability requirement, the high pressure boundary value of the rated pressure scope of compressor corresponding with the maximum of condensation temperature is not one
Into constant, but a curve.So, if still carrying out stoppage protection, meeting to compressor using the pressure value of a certain fixation
Exist under Part load, the pressure value of the fixation used is more than actual high pressure boundary value, in the exhaust port pressure of compressor
More than actual high pressure boundary value, but when being not up to used fixation pressure value, it is impossible to carry out shutdown guarantor to compressor in time
Shield, or, the pressure value of the fixation used is less than actual high pressure boundary value, is less than in the exhaust port pressure of compressor actual
High pressure boundary value, but higher than the pressure value of used fixation, stoppage protection is carried out to compressor, occurs frequently protecting
Situation, the reliability for carrying out stoppage protection to compressor is relatively low.Therefore, how to improve and the reliable of stoppage protection is carried out to compressor
Property turn into urgent problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of control method, device and air conditioner, shutdown guarantor is carried out to compressor to improve
The reliability of shield.
To achieve the above object, the invention provides following technical scheme：
A kind of control method, applied to air conditioner, including：
The first pressure value of the exhaust outlet of compressor in the air conditioner and the air inlet of the compressor are gathered simultaneously
Second pressure value；
Obtain the first condensing temperature value corresponding with first pressure value and evaporation corresponding with second pressure value
Temperature value；
Obtain maximum condensing temperature value corresponding with evaporating temperature value；
When first condensing temperature value is more than or equal to the maximum condensing temperature value, the compressor is controlled to stop
Machine.
The above method, it is preferred that the acquisition the first condensing temperature value corresponding with first pressure value and with it is described
The corresponding evaporating temperature value of second pressure value includes：
Table search and the first pressure value are compareed by pressure-saturation temperature of refrigerant used in the compressor
Corresponding first condensing temperature value and evaporating temperature value corresponding with second pressure value.
The above method, it is preferred that the acquisition the first condensing temperature value corresponding with first pressure value and with it is described
The corresponding evaporating temperature value of second pressure value includes：
Calculated and obtained and institute with the first relational expression of the exhaust port pressure of the compressor by the condensation temperature of refrigerant
State corresponding first condensing temperature value of first pressure value；
Calculated and obtained and institute with the second relational expression of the inlet pressure of the compressor by the evaporating temperature of refrigerant
State the corresponding evaporating temperature value of second pressure value.
A kind of control device, applied to air conditioner, including：
Acquisition module, for gathering the first pressure value of the exhaust outlet of compressor in the air conditioner and the compression simultaneously
The second pressure value of the air inlet of machine；
First acquisition module, for obtaining corresponding with first pressure value the first condensing temperature value and with described second
The corresponding evaporating temperature value of pressure value；
Second acquisition module, for obtaining maximum condensing temperature value corresponding with evaporating temperature value；
Control module, for when first condensing temperature value is more than or equal to the maximum condensing temperature value, controlling
The compressor shutdown.
Said apparatus, it is preferred that first acquisition module includes：
Searching unit, for the pressure by refrigerant used in the compressor-protection temperature control table search with
The first pressure is worth corresponding first condensing temperature value and evaporating temperature value corresponding with second pressure value.
Said apparatus, it is preferred that first acquisition module includes：
First computing unit, first for the condensation temperature by refrigerant and the exhaust port pressure of the compressor closes
It is that formula calculating obtains the first condensing temperature value corresponding with the first pressure value；
Second computing unit, second for the evaporating temperature by refrigerant and the inlet pressure of the compressor closes
It is that formula calculating obtains evaporating temperature value corresponding with the second pressure value.
A kind of air conditioner, including the as above control device described in any one.
A kind of control method provided by above scheme, the application, while gathering compressor in the air conditioner
Exhaust outlet first pressure and the compressor air inlet second pressure；Obtain corresponding with the first pressure first
Condensation temperature and evaporating temperature corresponding with the second pressure；Obtain maximum condensation temperature corresponding with the evaporating temperature；
When first condensation temperature is more than or equal to the maximum condensation temperature, the compressor shutdown is controlled.
To sum up, the control method that the embodiment of the present application is provided, while detecting the first pressure value of exhaust outlet of compressor and entering
The second pressure value of gas port, corresponding first condensing temperature value, i.e., actual condensation temperature, by second are converted to by first pressure value
Pressure value is converted to corresponding evaporating temperature value, and obtains maximum condensing temperature value corresponding with evaporating temperature value, when first cold
When solidifying temperature value is more than or equal to the maximum condensing temperature value, illustrate the actual pressure overflow level pressure of the exhaust outlet of compressor
The high pressure boundary value of power scope, controls the compressor shutdown immediately so that once in actual exhaust air mouthful pressure overflow level pressure
Stoppage protection is carried out to compressor immediately during the high pressure boundary value of power scope, improves and the reliable of stoppage protection is carried out to compressor
Property.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the relation block diagram of compressor operating block diagram, i.e. condensation temperature and evaporating temperature in air-conditioner refrigerating system；
A kind of implementation process figure for the control method that Fig. 2 provides for the embodiment of the present application；
A kind of structural representation for the control device that Fig. 3 provides for the embodiment of the present application；
A kind of structural representation for the first acquisition module that Fig. 4 provides for the embodiment of the present application；
Another structural representation for the second acquisition module that Fig. 5 provides for the embodiment of the present application.
Term " first ", " second ", " the 3rd " " the 4th " in specification and claims and above-mentioned accompanying drawing etc. (if
In the presence of) it is for distinguishing similar part, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so that embodiments herein described herein can be with except illustrating herein
Order in addition is implemented.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The control method and device that the embodiment of the present application is provided are applied to air conditioner.
Referring to Fig. 2, a kind of implementation process figure for the control method that Fig. 2 provides for the embodiment of the present application, can include：
Step S21：The first pressure value and the compressor of the exhaust outlet of compressor in the air conditioner are gathered simultaneously
The second pressure value of air inlet；
Second pressure sensor can be passed through by the first pressure value of first pressure sensor collect and process machine exhaust outlet
The second pressure value of collect and process machine air inlet；
Wherein, first pressure value and second pressure value are to gather simultaneously.
Step S22：Obtain corresponding with first pressure value the first condensing temperature value and with the second pressure value pair
The evaporating temperature value answered；
For same refrigerant, under different external loads, the first pressure value of exhaust outlet of compressor be it is different,
Therefore, under different external loads, it is also different that first pressure is worth corresponding condensing temperature value；
Similarly, for same refrigerant, under different external loads, the second pressure value of compressor inlet is not yet
Together, therefore, under different external loads, it is also different that second pressure is worth corresponding evaporating temperature.
Wherein, the first condensing temperature value corresponding with first pressure value is the actual condensation temperature of air conditioner condenser system；
Evaporating temperature value corresponding with second pressure value is the actual evaporating temperature of air conditioner condenser system.
Step S23：Obtain maximum condensing temperature value corresponding with evaporating temperature value；
The condensation temperature of refrigerant is as the external load moment changes in air conditioner condenser system, i.e. different
Under external load, the condensation temperature of refrigerant is different, therefore, under same evaporating temperature, it is also possible to different cold of correspondence
In solidifying temperature, the embodiment of the present application, obtain with acquired evaporating temperature value (i.e. with the corresponding evaporating temperature of second pressure value
Value) maximum in corresponding condensing temperature value.
It is preferred that, can be obtained by the relation curve of evaporating temperature shown in dotted lines in Figure 1 and condensation temperature with it is described
Evaporating temperature is worth corresponding maximum condensing temperature value.
Step S24：When first condensing temperature value is more than or equal to the maximum condensing temperature value, the pressure is controlled
Contracting machine is shut down.
When the first condensing temperature value is more than or equal to the maximum condensing temperature value, illustrate the reality of the exhaust outlet of compressor
Border pressure exceeds the high pressure boundary value of rated pressure scope, and compressor shutdown is now controlled immediately.
The control method that the embodiment of the present application is provided, while detecting the first pressure value and air inlet of exhaust outlet of compressor
Second pressure value, corresponding first condensing temperature value, i.e., actual condensation temperature, by second pressure value are converted to by first pressure value
Corresponding evaporating temperature value is converted to, and obtains maximum condensing temperature value corresponding with evaporating temperature value, when the first condensation temperature
When value is more than or equal to the maximum condensing temperature value, illustrate that the actual pressure of the exhaust outlet of compressor exceeds rated pressure scope
High pressure boundary value, the compressor shutdown is controlled immediately so that in actual exhaust air mouthful pressure once beyond rated pressure scope
High pressure boundary value when immediately to compressor carry out stoppage protection, improve to compressor carry out stoppage protection reliability.
Above-described embodiment, it is preferred that the acquisition the first condensing temperature value corresponding with first pressure value and with institute
Stating the corresponding evaporating temperature value of second pressure value can include：
Table search and the first pressure value are compareed by pressure-saturation temperature of refrigerant used in the compressor
Corresponding first condensing temperature value and evaporating temperature value corresponding with second pressure value.
In the embodiment of the present application, according to the pressure of refrigerant-saturation temperature table of comparisons, search corresponding with first pressure value
Condensation temperature and with the corresponding evaporating temperature of second pressure value, wherein, the first pressure value is actual cold of condenser system
Solidifying pressure value, second pressure value is the actual evaporation pressure value of condenser system.
Except the corresponding condensation temperature of first pressure value and the corresponding evaporation temperature of second pressure value can be obtained by tabling look-up
It is outside one's consideration, the corresponding condensation temperature of first pressure value and the corresponding evaporating temperature of second pressure value can also be obtained by calculating.On
State in embodiment, it is preferred that described to obtain the first condensing temperature value corresponding with first pressure value and pressed with described second
The corresponding evaporating temperature value of force value can also include：
Calculated and obtained and institute with the first relational expression of the exhaust port pressure of the compressor by the condensation temperature of refrigerant
State corresponding first condensing temperature value of first pressure value；
Calculated and obtained and institute with the second relational expression of the inlet pressure of the compressor by the evaporating temperature of refrigerant
State the corresponding evaporating temperature value of second pressure value.
Wherein, the first relational expression and the second relational expression can be fitted by saturation pressure-temperature table of comparisons of refrigerant
Arrive, specifically how to be fitted the common knowledge for belonging to this area, repeat no more here.
Corresponding with embodiment of the method, the embodiment of the present application also provides a kind of control device, what the embodiment of the present application was provided
A kind of structural representation of control device is as shown in figure 3, can include：
Acquisition module 31, the first acquisition module 32, the second acquisition module 33 and control module 34；Wherein,
Acquisition module 31 is used for the first pressure value and the pressure for gathering the exhaust outlet of compressor in the air conditioner simultaneously
The second pressure value of the air inlet of contracting machine；
Acquisition module 31 can include：First pressure sensor and second pressure sensor, wherein, first pressure sensor
First pressure value for collect and process machine exhaust outlet；Second pressure sensor is used for the second pressure of collect and process machine air inlet
Value.
First acquisition module 32 is used to obtaining corresponding with first pressure value the first condensing temperature value and with described the
The corresponding evaporating temperature value of two pressure values；
For same refrigerant, under different external loads, the first pressure value of exhaust outlet of compressor be it is different,
Therefore, under different external loads, it is also different that first pressure is worth corresponding condensing temperature value；
Similarly, for same refrigerant, under different external loads, the second pressure value of compressor inlet is not yet
Together, therefore, under different external loads, it is also different that second pressure is worth corresponding evaporating temperature value.
Wherein, the first condensing temperature value corresponding with first pressure value is the actual condensation temperature of air conditioner condenser system；
Evaporating temperature value corresponding with second pressure value is the actual evaporating temperature of air conditioner condenser system.
Second acquisition module 33 is used to obtain maximum condensing temperature value corresponding with evaporating temperature value；
The condensation temperature of air conditioner condenser system is as the external load moment changes, moreover, negative in the different external worlds
Under lotus, the condensation temperature of refrigerant is different, therefore, under same evaporating temperature, it is also possible to the different condensation temperature of correspondence,
In the embodiment of the present application, obtain corresponding with acquired evaporating temperature value (evaporating temperature value i.e. corresponding with second pressure value)
Maximum in condensing temperature value.
It is preferred that, can be obtained by the relation curve of evaporating temperature shown in dotted lines in Figure 1 and condensation temperature with it is described
Evaporating temperature is worth corresponding maximum condensing temperature value.
Control module 34 is used for when first condensing temperature value is more than or equal to the maximum condensing temperature value, control
The compressor shutdown.
When the first condensing temperature value is more than or equal to the maximum condensing temperature value, illustrate the reality of the exhaust outlet of compressor
Border pressure exceeds the high pressure boundary value of rated pressure scope, and compressor shutdown is now controlled immediately.
The control device that the embodiment of the present application is provided, while detecting the first pressure value and air inlet of exhaust outlet of compressor
Second pressure value, corresponding first condensing temperature value, i.e., actual condensation temperature, by second pressure value are converted to by first pressure value
Corresponding evaporating temperature value is converted to, and obtains maximum condensing temperature value corresponding with evaporating temperature value, when the first condensation temperature
When value is more than or equal to the maximum condensing temperature value, illustrate that the actual pressure of the exhaust outlet of compressor exceeds rated pressure scope
High pressure boundary value, the compressor shutdown is controlled immediately so that in actual exhaust air mouthful pressure once beyond rated pressure scope
High pressure boundary value when immediately to compressor carry out stoppage protection, improve to compressor carry out stoppage protection reliability.
In above-described embodiment, it is preferred that a kind of structural representation for the first acquisition module 32 that the embodiment of the present application is provided
As shown in figure 4, can include：
Searching unit 41, for the pressure by refrigerant used in the compressor-saturation temperature control table search
The first condensing temperature value corresponding with first pressure value and evaporating temperature value corresponding with second pressure value.
In the embodiment of the present application, according to the pressure of refrigerant-saturation temperature table of comparisons, search corresponding with first pressure value
Condensation temperature and with the corresponding evaporating temperature of second pressure value, wherein, the first pressure value is actual cold of condenser system
Solidifying pressure value, second pressure value is the actual evaporation pressure value of condenser system.
Another structural representation for the second acquisition module 32 that the embodiment of the present application is provided is as shown in figure 5, can also wrap
Include：
First computing unit 51, for the condensation temperature by refrigerant and the first of the exhaust port pressure of the compressor
Relational expression calculates and obtains the first condensing temperature value corresponding with the first pressure value；
Second computing unit 52, for the evaporating temperature by refrigerant and the second of the inlet pressure of the compressor
Relational expression calculates and obtains evaporating temperature value corresponding with the second pressure value.
Wherein, the first relational expression and the second relational expression can be fitted by saturation pressure-temperature table of comparisons of refrigerant
Arrive, specifically how to be fitted the common knowledge for belonging to this area, repeat no more here.
In the embodiment of the present application, the corresponding condensation temperature of first pressure value is obtained by calculating and second pressure value is corresponding
Evaporating temperature.
The embodiment of the present application also provides a kind of air conditioner, and it has control device as above described in any one.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (7)
1. a kind of control method, applied to air conditioner, it is characterised in that including：
Gather the second of the first pressure value of the exhaust outlet of compressor in the air conditioner and the air inlet of the compressor simultaneously
Pressure value；
Obtain corresponding with first pressure value the first condensing temperature value and with the corresponding evaporating temperature of second pressure value
Value；
Obtain maximum condensing temperature value corresponding with evaporating temperature value；
When first condensing temperature value is more than or equal to the maximum condensing temperature value, the compressor shutdown is controlled.
2. according to the method described in claim 1, it is characterised in that described to obtain cold with first pressure value corresponding first
Solidifying temperature value and evaporating temperature value corresponding with the second pressure value include：
Table search is compareed by pressure-saturation temperature of refrigerant used in the compressor corresponding with the first pressure value
The first condensing temperature value and evaporating temperature value corresponding with second pressure value.
3. according to the method described in claim 1, it is characterised in that described to obtain cold with first pressure value corresponding first
Solidifying temperature value and evaporating temperature value corresponding with the second pressure value include：
Calculated and obtained and described the by the first relational expression of the condensation temperature of refrigerant and the exhaust port pressure of the compressor
Corresponding first condensing temperature value of one pressure value；
Calculated and obtained and described the by the second relational expression of the evaporating temperature of refrigerant and the inlet pressure of the compressor
The corresponding evaporating temperature value of two pressure values.
4. a kind of control device, applied to air conditioner, it is characterised in that including：
Acquisition module, first pressure value and the compressor for gathering the exhaust outlet of compressor in the air conditioner simultaneously
The second pressure value of air inlet；
First acquisition module, for obtain corresponding with first pressure value the first condensing temperature value and with the second pressure
It is worth corresponding evaporating temperature value；
Second acquisition module, for obtaining maximum condensing temperature value corresponding with evaporating temperature value；
Control module, for when first condensing temperature value is more than or equal to the maximum condensing temperature value, control to be described
Compressor shutdown.
5. device according to claim 4, it is characterised in that first acquisition module includes：
Searching unit, for the pressure by refrigerant used in the compressor-saturation temperature control table search with it is described
First pressure is worth corresponding first condensing temperature value and evaporating temperature value corresponding with second pressure value.
6. device according to claim 4, it is characterised in that first acquisition module includes：
First computing unit, for the condensation temperature by refrigerant and the first relational expression of the exhaust port pressure of the compressor
Calculating obtains the first condensing temperature value corresponding with the first pressure value；
Second computing unit, for the evaporating temperature by refrigerant and the second relational expression of the inlet pressure of the compressor
Calculating obtains evaporating temperature value corresponding with the second pressure value.
7. a kind of air conditioner, it is characterised in that including the control device as described in claim 4-6 any one.
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| CN201410327961.3A CN104048388B (en) | 2014-07-10 | 2014-07-10 | Control method and device and air conditioner |
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| CN201410327961.3A CN104048388B (en) | 2014-07-10 | 2014-07-10 | Control method and device and air conditioner |
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| CN104048388A CN104048388A (en) | 2014-09-17 |
| CN104048388B true CN104048388B (en) | 2017-09-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566809B (en) * | 2014-12-22 | 2018-04-13 | 珠海格力电器股份有限公司 | Air conditioner and control method thereof |
| CN106089672B (en) * | 2016-07-15 | 2018-08-03 | 珠海格力电器股份有限公司 | Compressor reliability detection method and device |
| CN113639452B (en) * | 2020-04-27 | 2023-02-28 | 青岛海尔空调电子有限公司 | Compressor control method for heat exchange system |
| CN112944600B (en) * | 2021-03-22 | 2022-03-29 | 珠海格力电器股份有限公司 | Air conditioner operation control method and system, air conditioner and storage medium |
| CN114110953B (en) * | 2021-11-29 | 2023-05-16 | 海信空调有限公司 | Self-cleaning control method for air conditioner, air conditioner and computer storage medium |
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|---|---|---|---|---|
| US4345714A (en) * | 1979-08-01 | 1982-08-24 | Nippondenso Co., Ltd. | Control method and apparatus for air conditioners |
| CN102080864A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团江苏有限公司 | Method and device for monitoring pressure value of air conditioner in real time |
| CN102778006A (en) * | 2012-07-24 | 2012-11-14 | 青岛海信日立空调系统有限公司 | Method and device for acquiring pressure parameter of multi-connected air-conditioning system |
| CN103375870A (en) * | 2012-04-16 | 2013-10-30 | 珠海格力电器股份有限公司 | Intelligent refrigerating capacity adjusting method for variable flow air conditioning system |
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2014
- 2014-07-10 CN CN201410327961.3A patent/CN104048388B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4345714A (en) * | 1979-08-01 | 1982-08-24 | Nippondenso Co., Ltd. | Control method and apparatus for air conditioners |
| CN102080864A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团江苏有限公司 | Method and device for monitoring pressure value of air conditioner in real time |
| CN103375870A (en) * | 2012-04-16 | 2013-10-30 | 珠海格力电器股份有限公司 | Intelligent refrigerating capacity adjusting method for variable flow air conditioning system |
| CN102778006A (en) * | 2012-07-24 | 2012-11-14 | 青岛海信日立空调系统有限公司 | Method and device for acquiring pressure parameter of multi-connected air-conditioning system |
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