CN109357453A - Method and device for judging variable capacity switching of variable capacity compressor and control device - Google Patents
Method and device for judging variable capacity switching of variable capacity compressor and control device Download PDFInfo
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- CN109357453A CN109357453A CN201811219728.8A CN201811219728A CN109357453A CN 109357453 A CN109357453 A CN 109357453A CN 201811219728 A CN201811219728 A CN 201811219728A CN 109357453 A CN109357453 A CN 109357453A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000003507 refrigerant Substances 0.000 claims abstract description 368
- 230000008859 change Effects 0.000 claims abstract description 148
- 230000006835 compression Effects 0.000 claims abstract description 95
- 238000007906 compression Methods 0.000 claims abstract description 95
- 230000009471 action Effects 0.000 claims abstract description 85
- 230000007246 mechanism Effects 0.000 claims abstract description 78
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims description 77
- 230000033001 locomotion Effects 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 238000004378 air conditioning Methods 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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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
- F25B49/022—Compressor control arrangements
-
- 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
- F25B2600/02—Compressor control
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Abstract
The invention provides a method and a device for judging variable capacity switching of a variable capacity compressor, a control device, the variable capacity compressor, an air conditioning unit and a storage medium, and relates to the technical field of compressors, wherein the method comprises the following steps: acquiring a first refrigerant flow rate change rate based on a first refrigerant flow rate and a second refrigerant flow rate which are acquired before and after the switching mechanism executes the switching action of the compression cylinder by a refrigerant flow rate detection device arranged on a refrigerant pipeline; and judging whether the switching mechanism successfully executes the compression cylinder switching action or not according to a preset switching success judgment rule and the first refrigerant flow speed change rate. The method, the device, the control device, the variable volume compressor, the air conditioning unit and the storage medium can accurately judge whether the switching mechanism successfully executes the compression cylinder switching action, can effectively control the operation of a single cylinder, multiple cylinders and the like of the variable volume compressor, enables the variable volume compressor to operate in an optimal state, and can improve the competitiveness of products and the use sensitivity of customers.
Description
Technical field
The present invention relates to the judgment methods of Compressor Technology field more particularly to a kind of positive displacement compressor transfiguration switching, dress
It sets and control device, positive displacement compressor, air-conditioner set and storage medium.
Background technique
Positive displacement compressor can be improved compressor capacity when load is big, can reduce compressor displacement under low loading conditions
Amount.For positive displacement compressor when single cylinder is run, rotor rotation belongs to eccentric turn, so that compressor shake is big, noise is big, service life
It is short, reliability is low；Positive displacement compressor is when twin-tub is run, if positive displacement compressor is size cylinder compressor, compressor shake
Greatly.Transfiguration size cylinder compressor is run, under twin-tub operation in single cylinder, and compressor air-discharging amount, electric efficiency are different, lubricating system control
System etc. is also different, needs to be respectively controlled single cylinder operation, twin-tub operation, to reach the optimal usage mode of compressor, therefore,
It needs to be determined that positive displacement compressor executes whether compression cylinder switching action succeeds, still, currently without judging compression cylinder switching action
Whether successful technical solution.
Summary of the invention
In view of this, the invention solves a technical problem be to provide the judgement of positive displacement compressor transfiguration switching a kind of
Method, apparatus and control device, positive displacement compressor, air-conditioner set and storage medium can be based on executing pressure in switching mechanism
The refrigerant flow rate of the forward and backward acquisition of contracting cylinder switching action obtains refrigerant flow rate rate of change, and is sentenced according to refrigerant flow rate rate of change
It is disconnected to execute whether compression cylinder switching action succeeds.
According to an aspect of the present invention, a kind of judgment method of positive displacement compressor transfiguration switching is provided, comprising: set
It is cold to set the refrigerant flow rate detection device on refrigerant pipeline acquires before switching mechanism executes compression cylinder switching action first
Matchmaker's flow velocity executes the second refrigerant flow rate acquired after the compression cylinder switching action in the switching mechanism；Based on described
One refrigerant flow rate and second refrigerant flow rate obtain the first refrigerant flow rate rate of change；Judge to advise according to preset handover success
Then judge that the switching mechanism executes whether the compression cylinder switching action succeeds with the first refrigerant flow rate rate of change.
Optionally, described that institute is judged according to preset handover success judgment rule and the first refrigerant flow rate rate of change
It states switching mechanism and executes whether the compression cylinder switching action successfully includes: to obtain the first rate of change threshold value；By described first
Refrigerant flow rate rate of change is compared with the first rate of change threshold value, judges that the switching mechanism is held based on comparison result
Whether the row compression cylinder switching action succeeds.
Optionally, described to judge that the switching mechanism executes whether the compression cylinder switching action succeeds based on comparison result
If including: that the first refrigerant flow rate rate of change is greater than or equal to the first rate of change threshold value, it is determined that described to cut
Structure of changing planes executes the compression cylinder switching action success；If the first refrigerant flow rate rate of change is less than first variation
Rate-valve value, it is determined that the switching mechanism executes the compression cylinder switching action failure.
Optionally, the refrigerant flow rate detection device being arranged on refrigerant pipeline that obtains executes compression cylinder in switching mechanism
The first refrigerant flow rate for acquiring before switching action acquires after the switching mechanism executes the compression cylinder switching action
Second refrigerant flow rate includes: to judge the refrigerant when determining that the switching mechanism needs to be implemented the compression cylinder switching action
Whether the refrigerant flow rate in pipeline is stable, if it is, obtaining first refrigerant flow rate；Described in being executed in the switching mechanism
After compression cylinder switching action, second refrigerant flow rate is obtained by preset first duration.
Optionally, it includes: to obtain the refrigerant flow rate that whether the refrigerant flow rate judged in the refrigerant pipeline is stable
The third refrigerant flow rate and the 4th refrigerant flow rate of preset second duration collection in detection device interval；Based on the third refrigerant stream
Fast and described 4th refrigerant flow rate obtains the second refrigerant flow rate rate of change；According to preset flow speed stability judgment rule and described
Second refrigerant flow rate rate of change judges whether the refrigerant flow rate in the refrigerant pipeline is stable.
Optionally, described that institute is judged according to preset flow speed stability judgment rule and the second refrigerant flow rate rate of change
Whether stable stating the refrigerant flow rate in refrigerant pipeline includes: to obtain the second rate of change threshold value；Second refrigerant flow rate is become
Change rate to be compared with the second rate of change threshold value, the refrigerant flow rate in the refrigerant pipeline is judged based on comparison result
It is whether stable.
Optionally, if described judge whether the refrigerant flow rate in the refrigerant pipeline is stable based on comparison result and include:
The second refrigerant flow rate rate of change is greater than the second rate of change threshold value, it is determined that the refrigerant stream in the refrigerant pipeline
Speed is unstable；If the second refrigerant flow rate rate of change is less than or equal to the second rate of change threshold value, it is determined that institute
The refrigerant flow rate stated in refrigerant pipeline is stablized.
Optionally, described that the variation of second refrigerant flow rate is obtained based on the third refrigerant flow rate and the 4th refrigerant flow rate
Rate includes: to obtain the absolute value of the difference of the 4th refrigerant flow rate and the third refrigerant flow rate, by this absolute value with it is described
The ratio of second duration is as the second refrigerant flow rate rate of change.
Alternatively, if it is determined that the refrigerant flow rate in the refrigerant pipeline is unstable, then alarm information is sent.
Optionally, the refrigerant pipeline includes: the export pipeline of the entrance pipe of positive displacement compressor, positive displacement compressor.
Optionally, described that the variation of first refrigerant flow rate is obtained based on first refrigerant flow rate and second refrigerant flow rate
Rate includes: to obtain the absolute value of the difference of first refrigerant flow rate and second refrigerant flow rate, by this absolute value with it is described
The ratio of first duration is as the first refrigerant flow rate rate of change.
According to another aspect of the present invention, a kind of judgment means of positive displacement compressor transfiguration switching are provided, comprising: refrigerant stream
Speed obtains module, executes compression cylinder switching in switching mechanism for obtaining the refrigerant flow rate detection device being arranged on refrigerant pipeline
Act the first refrigerant flow rate acquired before, acquire after the switching mechanism executes the compression cylinder switching action second
Refrigerant flow rate；Rate of change obtains module, for obtaining first based on first refrigerant flow rate and second refrigerant flow rate
Refrigerant flow rate rate of change；Handover operation judgment module, for according to preset handover success judgment rule and described first cold
Matchmaker's change in flow rate judges that the switching mechanism executes whether the compression cylinder switching action succeeds.
Optionally, the handover operation judgment module, for obtaining the first rate of change threshold value；By the first refrigerant stream
Fast rate of change is compared with the first rate of change threshold value, is judged described in the switching mechanism execution based on comparison result
Whether compression cylinder switching action succeeds.
Optionally, the handover operation judgment module, if being greater than or waiting for the first refrigerant flow rate rate of change
In the first rate of change threshold value, it is determined that the switching mechanism executes the compression cylinder switching action success；If described
First refrigerant flow rate rate of change is less than the first rate of change threshold value, it is determined that the switching mechanism executes the compression cylinder
Switching action failure.
Optionally, the refrigerant flow rate obtains module, comprising: state judging unit, for determining the switching mechanism
When needing to be implemented the compression cylinder switching action, judge whether the refrigerant flow rate in the refrigerant pipeline is stable；Flow velocity obtains single
Member obtains first refrigerant flow rate if stablized for the refrigerant flow rate in the refrigerant pipeline；In the switching mechanism
After executing the compression cylinder switching action, second refrigerant flow rate is obtained by preset first duration.
Optionally, the state judging unit, for obtain refrigerant flow rate detection device interval it is preset second when
The third refrigerant flow rate and the 4th refrigerant flow rate of long acquisition；It is obtained based on the third refrigerant flow rate and the 4th refrigerant flow rate
Second refrigerant flow rate rate of change；Judged according to preset flow speed stability judgment rule and the second refrigerant flow rate rate of change
Whether the refrigerant flow rate in the refrigerant pipeline is stable.
Optionally, the state judging unit, for obtaining the second rate of change threshold value；Second refrigerant flow rate is become
Change rate to be compared with the second rate of change threshold value, the refrigerant flow rate in the refrigerant pipeline is judged based on comparison result
It is whether stable.
Optionally, the state judging unit, if being also used to the second refrigerant flow rate rate of change is greater than described the
Two rate of change threshold values, it is determined that the refrigerant flow rate in the refrigerant pipeline is unstable；If the second refrigerant flow rate variation
Rate is less than or equal to the second rate of change threshold value, it is determined that the refrigerant flow rate in the refrigerant pipeline is stablized.
Optionally, the state judging unit, for obtain the 4th refrigerant flow rate and the third refrigerant flow rate it
Absolute value of the difference, using this absolute value and the ratio of second duration as the second refrigerant flow rate rate of change.
Optionally, the refrigerant flow rate obtains module, comprising: Alarm Unit, for if it is determined that in the refrigerant pipeline
Refrigerant flow rate it is unstable, then send alarm information.
Optionally, the rate of change obtains module, for obtaining first refrigerant flow rate and the second refrigerant stream
The absolute value of the difference of speed, using this absolute value and the ratio of first duration as the first refrigerant flow rate rate of change.
Optionally, the refrigerant pipeline includes: the export pipeline of the entrance pipe of positive displacement compressor, positive displacement compressor.
According to another aspect of the invention, a kind of judgment means of positive displacement compressor transfiguration switching are provided, comprising: storage
Device；And it is coupled to the processor of the memory, the processor is configured to the finger based on storage in the memory
It enables, executes method as described above.
According to another aspect of the invention, a kind of control device is provided, comprising: positive displacement compressor transfiguration as described above is cut
The judgment means changed.
According to another aspect of the invention, a kind of positive displacement compressor is provided, comprising: control device as described above.
According to another aspect of the invention, a kind of air-conditioner set is provided, comprising: positive displacement compressor as described above.
In accordance with a further aspect of the present invention, a kind of computer readable storage medium, the computer-readable storage medium are provided
Matter is stored with computer instruction, and described instruction is executed by processor method as described above.
Judgment method, device and control device, the positive displacement compressor, air-conditioning of positive displacement compressor transfiguration switching of the invention
Unit and storage medium execute the cold of the forward and backward acquisition of compression cylinder switching action in switching mechanism based on refrigerant flow rate detection device
Matchmaker's flow velocity obtains refrigerant flow rate rate of change, judges switching mechanism according to handover success judgment rule and refrigerant flow rate rate of change
Execute whether compression cylinder switching action succeeds；Can accurate judgement switching mechanism execute compression cylinder switching action whether succeed, can
It is effectively controlled with operations such as single cylinder, multi-cylinders to positive displacement compressor, positive displacement compressor is made to operate in optimum state, it can
The comfort for improving the service life of positive displacement compressor and using, can be improved the competitiveness of product and can be improved client's
Use feeling degree.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without any creative labor, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the process signal of one embodiment of the judgment method of positive displacement compressor transfiguration according to the present invention switching
Figure；
Fig. 2 is the switching mechanism schematic diagram of positive displacement compressor；
Fig. 3 is the judgement compression in one embodiment of the judgment method of positive displacement compressor transfiguration according to the present invention switching
The whether successful flow diagram of cylinder switching action；
Fig. 4 is the acquisition first in one embodiment of the judgment method of positive displacement compressor transfiguration according to the present invention switching
The flow diagram of refrigerant flow rate rate of change；
Fig. 5 is the judgement refrigerant in one embodiment of the judgment method of positive displacement compressor transfiguration according to the present invention switching
The whether stable flow diagram of flow velocity；
Fig. 6 is the module signal of one embodiment of the judgment means of positive displacement compressor transfiguration according to the present invention switching
Figure；
Fig. 7 is the refrigerant flow rate in one embodiment of the judgment means of positive displacement compressor transfiguration according to the present invention switching
Obtain the module diagram of module；
Fig. 8 is the module signal of another embodiment of the judgment means of positive displacement compressor transfiguration according to the present invention switching
Figure.
Specific embodiment
With reference to the accompanying drawings to invention is more fully described, wherein illustrating exemplary embodiment of the present invention.Under
Face will combine the attached drawing in the embodiment of the present invention, and technical scheme in the embodiment of the invention is clearly and completely described, show
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.Various descriptions are carried out to technical solution of the present invention below with reference to each figure and embodiment.
" first " hereinafter, " second " etc. are only to distinguish in description, and there is no other special meanings.
Fig. 1 is the process signal of one embodiment of the judgment method of positive displacement compressor transfiguration according to the present invention switching
Figure, as shown in Figure 1:
Step 101, the refrigerant flow rate detection device being arranged on refrigerant pipeline is obtained to cut in switching mechanism execution compression cylinder
Move the first refrigerant flow rate acquired before making, the second refrigerant stream acquired after switching mechanism execution compression cylinder switching action
Speed.
Positive displacement compressor can be transfiguration duplex cylinder compressor, be also possible to three cylinders or more than positive displacement compressor etc.,
Each compression cylinder of positive displacement compressor can be isometric(al) cylinder, be also possible to size cylinder.Positive displacement compressor can become for transfiguration frequency conversion
Positive displacement compressor.
Step 102, the first refrigerant flow rate rate of change is obtained based on the first refrigerant flow rate and the second refrigerant flow rate.
Step 103, switching mechanism is judged according to preset handover success judgment rule and the first refrigerant flow rate rate of change
Execute whether compression cylinder switching action succeeds.First refrigerant flow rate rate of change is positive value (will not be usually 0), compression cylinder switching
Movement can be for twin-tub is switched to small cylinder, small cylinder is switched to the various motions such as twin-tub.
When executing compression cylinder switching action, due to the capacity suddenly change of compressor, compressor operating frequency not
In the case where change, system refrigerant has variation by a relatively large margin, can by executing the forward and backward refrigerant flow rate of compression cylinder switching action
To judge to execute whether compression cylinder switching action succeeds.For example, cutting twin-tub executing single cylinder for transfiguration size cylinder compressor
When compression cylinder switching action, the capacity of compressor can increase suddenly, and the cold medium flux on air intake duct (exhaust pipe) increases suddenly,
In the case where copper pipe sectional area is constant, refrigerant flow rate rises in proportion；In the compression cylinder switching action for executing twin-tub singulation cylinder
When, refrigerant flow rate reduces in proportion.Assuming that the positive displacement compressor gas displacement that single cylinder is run under A frequency is x, under twin-tub operation
Gas displacement be 2x, execute twin-tub singulation cylinder compression cylinder switching action when, the discharge capacity of positive displacement compressor is become suddenly by 2x
For x, calculated by flow velocity=flow/sectional area, flow (i.e. discharge capacity) halves, then also halving with flow velocity under pipeline.
Positive displacement compressor cuts cylinder principle difference, then the switching mechanism used is corresponding different, and different transfigurations is compressed
Machine has different switching mechanisms.As shown in Fig. 2, the switching mechanism of positive displacement compressor includes pipeline 11,12 and solenoid valve A, B
Deng.Switching mechanism executes the compression cylinder switching action of single twin-tub switching by changing the pressure size of transfiguration mouth.For example, in electromagnetism
In the state that valve A is opened, solenoid valve B is closed, transfiguration mouth is passed through high pressure, the operation of positive displacement compressor twin-tub；In the pass solenoid valve A, solenoid valve B
In the state of opening, transfiguration mouth is passed through low pressure, the operation of positive displacement compressor single cylinder.
Refrigerant flow rate detection device can use existing a variety of refrigerant flow rate detection devices, for detecting in refrigerant pipeline
The flow velocity of refrigerant.Refrigerant flow rate detection device can be set in a plurality of refrigerant pipeline, it is preferable that setting refrigerant flow rate detects dress
The refrigerant pipeline set is entrance pipe, the export pipeline of positive displacement compressor etc. of positive displacement compressor, for example, such as the compression in Fig. 2
Pipeline, the pipeline of vapour liquid separator to compressor etc. of the machine to four-way valve.
In one embodiment, it can be adopted for judging whether compression cylinder switching action successfully switches successfully judgment rule
Use multiple rule.Fig. 3 is the judgement in one embodiment of the judgment method of positive displacement compressor transfiguration according to the present invention switching
The whether successful flow diagram of compression cylinder switching action, as shown in Figure 3:
Step 301, the first rate of change threshold value is obtained.The occurrence of first rate of change threshold value and the class of positive displacement compressor
The factors such as type, refrigerant pipeline, the refrigerant type of the setting of refrigerant flow rate detection device are related, can be determined by modes such as experiments,
For example, 20kpa etc..
Step 302, the first refrigerant flow rate rate of change is compared with the first rate of change threshold value, is based on comparison result
Judge that switching mechanism executes whether compression cylinder switching action succeeds.For example, if the first refrigerant flow rate rate of change is greater than or waits
In the first rate of change threshold value, it is determined that switching mechanism executes the success of compression cylinder switching action；If the first refrigerant flow rate changes
Rate is less than the first rate of change threshold value, it is determined that switching mechanism executes the failure of compression cylinder switching action.
If it is determined that switching mechanism executes the success of compression cylinder switching action, it can run succeeded and disappear to control device transmission
Breath, if it is determined that switching mechanism executes the failure of compression cylinder switching action, can send to control device and execute failed message, so that
Control device is performed corresponding processing according to the implementing result of compression cylinder switching action.
Fig. 4 is the acquisition first in one embodiment of the judgment method of positive displacement compressor transfiguration according to the present invention switching
The flow diagram of refrigerant flow rate rate of change, as shown in Figure 4:
Step 401, when determining that switching mechanism needs to be implemented compression cylinder switching action, judge the refrigerant stream in refrigerant pipeline
Whether speed is stable.
Step 402, if it is, obtaining the first refrigerant flow rate.
Step 403, after switching mechanism executes compression cylinder switching action, the second refrigerant is obtained by preset first duration
Flow velocity.First duration and the factors such as the type of positive displacement compressor, refrigerant pipeline, the refrigerant type of the setting of refrigerant flow rate detection device
It is related, it can be determined by modes such as experiments, for example, 2-10 minutes etc..
Step 404, the absolute value of the difference for obtaining the first refrigerant flow rate and the second refrigerant flow rate, when by this absolute value and first
Long ratio is as the first refrigerant flow rate rate of change.
A variety of methods can be used by judging whether the refrigerant flow rate in refrigerant pipeline is stable.Fig. 5 is change according to the present invention
The flow diagram for judging whether refrigerant flow rate is stable in one embodiment of the judgment method of positive displacement compressor transfiguration switching, such as
Shown in Fig. 5:
Step 501, the third refrigerant flow rate and the of preset second duration collection in refrigerant flow rate detection device interval is obtained
Four refrigerant flow rates.Refrigerant pipeline, the refrigerant that second duration can be arranged with type, the refrigerant flow rate detection device of positive displacement compressor
The factors such as type are related, can be determined by modes such as experiments, for example, 1-2 minutes etc..
Step 502, the second refrigerant flow rate rate of change is obtained based on third refrigerant flow rate and the 4th refrigerant flow rate.Second is cold
Matchmaker's change in flow rate is positive value (will not be usually 0).
Step 503, refrigerant pipeline is judged according to preset flow speed stability judgment rule and the second refrigerant flow rate rate of change
In refrigerant flow rate it is whether stable.
The absolute value of the difference that the 4th refrigerant flow rate and third refrigerant flow rate can be obtained, by this absolute value and the second duration
Ratio is as the second refrigerant flow rate rate of change.Flow speed stability judgment rule can use a variety of decision rules.For example, obtaining the
Two rate of change threshold values；The occurrence of second rate of change threshold value and type, the refrigerant flow rate detection device of positive displacement compressor are set
The factors such as refrigerant pipeline, the refrigerant type set are related, can be determined by modes such as experiments, for example, 2kpa etc..
Second refrigerant flow rate rate of change is compared with the second rate of change threshold value, refrigerant is judged based on comparison result
Whether the refrigerant flow rate in pipeline is stable.For example, if the second refrigerant flow rate rate of change is greater than the second rate of change threshold value,
Determine that the refrigerant flow rate in refrigerant pipeline is unstable；If the second refrigerant flow rate rate of change is less than or equal to the second rate of change
Threshold value, it is determined that the refrigerant flow rate in refrigerant pipeline is stablized.
If it is determined that the refrigerant flow rate in refrigerant pipeline is stablized, flow speed stability message can be sent to control device.First
The value of refrigerant flow rate can use the value of the 4th refrigerant flow rate, hold after can also stablizing determining refrigerant flow rate and in switching mechanism
Before row compression cylinder switching action, the refrigerant flow rate of refrigerant flow rate detection device acquisition is obtained, using this refrigerant flow rate as first
Refrigerant flow rate.If it is determined that the refrigerant flow rate in refrigerant pipeline is unstable, then alarm information can be sent to control device.Control
After device receives flow speed stability message, it can control switching mechanism and execute compression cylinder switching action.Control device receives announcement
After alert message, it is dynamic that compression cylinder switching can be executed again after determining that refrigerant flow rate is stablized with temporary respite compression cylinder switching action
Make.
In one embodiment, when determining that switching mechanism needs to be implemented compression cylinder switching action, refrigerant flow rate inspection is obtained
Survey the third refrigerant flow rate S1 and the 4th refrigerant flow rate S2 of the preset second duration T1 acquisition in device interval；Calculate the second refrigerant stream
Fast rate of change △ S1=| S2-S1 |/T1, if the rate of change threshold value of △ S≤second a, it is determined that refrigerant flow rate is stablized.First
Refrigerant flow rate can be set to S2, execute compression cylinder switching action after can also stablizing determining refrigerant flow rate and in switching mechanism
Before, the refrigerant flow rate S4 for obtaining the acquisition of refrigerant flow rate detection device, sets S4 for the first refrigerant flow rate.
Switching mechanism executes compression cylinder switching action, obtains the second refrigerant flow rate S3 after the first duration T2, calculates the
One refrigerant flow rate rate of change △ S2=| S3-S2 |/T2, if the rate of change threshold value b of △ S2 >=first, switching mechanism execute pressure
Contracting cylinder switching action success, if △ S2 < b, then it is assumed that cut cylinder failure.A, b, T1, T2 are to preset, and specific value can be with
It is obtained by experimental data.
In one embodiment, as shown in fig. 6, the present invention provides a kind of judgment means of positive displacement compressor transfiguration switching
60, comprising: refrigerant flow rate obtains module 61, rate of change obtains module 62 and handover operation judgment module 63.Refrigerant flow rate obtains
Modulus block 61 obtain the refrigerant flow rate detection device that is arranged on refrigerant pipeline switching mechanism execute compression cylinder switching action it
First refrigerant flow rate of preceding acquisition executes the second refrigerant flow rate acquired after compression cylinder switching action in switching mechanism.Refrigerant
Pipeline includes the export pipeline etc. of the entrance pipe of positive displacement compressor, positive displacement compressor.
Rate of change obtains module 62 and is based on the first refrigerant flow rate and acquisition the first refrigerant flow rate variation of the second refrigerant flow rate
Rate.Handover operation judgment module 63 is cut according to preset handover success judgment rule and the judgement of the first refrigerant flow rate rate of change
Structure of changing planes executes whether compression cylinder switching action succeeds.
In one embodiment, handover operation judgment module 63 obtains the first rate of change threshold value, by the first refrigerant flow rate
Rate of change is compared with the first rate of change threshold value, judges that switching mechanism executes compression cylinder switching action based on comparison result
Whether succeed.For example, handover operation is sentenced if the first refrigerant flow rate rate of change is greater than or equal to the first rate of change threshold value
Disconnected module 63 determines that switching mechanism executes the success of compression cylinder switching action；If the first refrigerant flow rate rate of change becomes less than first
Change rate-valve value, then handover operation judgment module 63 determines that switching mechanism executes the failure of compression cylinder switching action.
In one embodiment, as shown in fig. 7, it includes: state judging unit 611, flow velocity that refrigerant flow rate, which obtains module 61,
Obtaining unit 612, Alarm Unit 613.State judging unit 611 is determining that switching mechanism needs to be implemented compression cylinder switching action
When, judge whether the refrigerant flow rate in refrigerant pipeline is stable.If the refrigerant flow rate in refrigerant pipeline is stablized, flow velocity obtains single
Member 612 obtains the first refrigerant flow rate, after switching mechanism executes compression cylinder switching action, obtains the by preset first duration
Two refrigerant flow rates.Rate of change obtains the absolute value of the difference that module 62 obtains the first refrigerant flow rate and the second refrigerant flow rate, by this
Absolute value and the ratio of the first duration are as the first refrigerant flow rate rate of change.
The third refrigerant stream of acquisition preset second duration collection in refrigerant flow rate detection device interval of state judging unit 611
Speed and the 4th refrigerant flow rate obtain the second refrigerant flow rate rate of change based on third refrigerant flow rate and the 4th refrigerant flow rate.State
Judging unit 611 judges cold in refrigerant pipeline according to preset flow speed stability judgment rule and the second refrigerant flow rate rate of change
Whether matchmaker's flow velocity is stable.State judging unit 611 obtains the absolute value of the difference of the 4th refrigerant flow rate and third refrigerant flow rate, by this
Absolute value and the ratio of the second duration are as the second refrigerant flow rate rate of change.
State judging unit 611 obtains the second rate of change threshold value, and the second refrigerant flow rate rate of change and second are changed
Rate-valve value is compared, and judges whether the refrigerant flow rate in refrigerant pipeline is stable based on comparison result.For example, if second is cold
Matchmaker's change in flow rate is greater than the second rate of change threshold value, then state judging unit 611 determines the refrigerant flow rate in refrigerant pipeline
It is unstable；If the second refrigerant flow rate rate of change is less than or equal to the second rate of change threshold value, state judging unit 611 is true
The refrigerant flow rate determined in refrigerant pipeline is stablized.If it is determined that the refrigerant flow rate in refrigerant pipeline is unstable, then Alarm Unit 613 is sent out
Send alarm information.
Fig. 8 is the module signal of another embodiment of the judgment means of positive displacement compressor transfiguration according to the present invention switching
Figure.As shown in figure 8, the device may include memory 81, processor 82, communication interface 83 and bus 84.Memory 81 is used for
Store instruction, processor 82 are coupled to memory 81, and it is real that processor 82 is configured as the instruction execution stored based on memory 81
The judgment method of existing above-mentioned positive displacement compressor transfiguration switching.
Memory 81 can be high speed RAM memory, nonvolatile memory (non-volatile memory) etc., deposit
Reservoir 81 is also possible to memory array.Memory 81 is also possible to by piecemeal, and block can be combined into virtually by certain rule
Volume.Processor 82 can be central processor CPU or application-specific integrated circuit ASIC (Application Specific
Integrated Circuit), or be arranged to implement the judgment method of positive displacement compressor transfiguration switching of the invention
One or more integrated circuits.
In one embodiment, the present invention provides a kind of control device, comprising: the transfiguration compression in any embodiment as above
The judgment means of machine transfiguration switching.
In one embodiment, the present invention provides a kind of positive displacement compressor, including the control dress in any embodiment as above
It sets.
In one embodiment, the present invention provides a kind of air-conditioner set, including the transfiguration compression in any embodiment as above
Machine.
In one embodiment, the present invention provides a kind of computer readable storage medium, and computer readable storage medium is deposited
Computer instruction is contained, the positive displacement compressor transfiguration switching in as above any one embodiment is realized when instruction is executed by processor
Judgment method.
Judgment method, device and the control device of positive displacement compressor transfiguration switching in above-described embodiment, transfiguration compression
Machine, air-conditioner set and storage medium are adopted before switching mechanism executes compression cylinder switching action based on refrigerant flow rate detection device
First refrigerant flow rate of collection, the second refrigerant flow rate acquisition first acquired after switching mechanism execution compression cylinder switching action are cold
Matchmaker's change in flow rate judges that switching mechanism executes compression according to handover success judgment rule and the first refrigerant flow rate rate of change
Whether cylinder switching action succeeds；Can accurate judgement switching mechanism execute compression cylinder switching action whether succeed, can be to transfiguration
The operations such as single cylinder, the multi-cylinder of compressor are effectively controlled, and positive displacement compressor is made to operate in optimum state, can be improved transfiguration
The service life of compressor and the comfort used improve the competitiveness of product and can be improved the use feeling degree of client.
Method and system of the invention may be achieved in many ways.For example, can by software, hardware, firmware or
Software, hardware, firmware any combination realize method and system of the invention.The said sequence of the step of for method is only
In order to be illustrated, the step of method of the invention, is not limited to sequence described in detail above, especially says unless otherwise
It is bright.In addition, in some embodiments, also the present invention can be embodied as to record program in the recording medium, these programs include
For realizing machine readable instructions according to the method for the present invention.Thus, the present invention also covers storage for executing according to this hair
The recording medium of the program of bright method.
Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention
It is limited to invented form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
The solution present invention is to design various embodiments suitable for specific applications with various modifications.
Claims (27)
1. a kind of judgment method of positive displacement compressor transfiguration switching characterized by comprising
The refrigerant flow rate detection device being arranged on refrigerant pipeline is obtained to adopt before switching mechanism executes compression cylinder switching action
First refrigerant flow rate of collection executes the second refrigerant flow rate acquired after the compression cylinder switching action in the switching mechanism；
The first refrigerant flow rate rate of change is obtained based on first refrigerant flow rate and second refrigerant flow rate；
Judge that the switching mechanism executes according to preset handover success judgment rule and the first refrigerant flow rate rate of change
Whether the compression cylinder switching action succeeds.
2. the method as described in claim 1, described according to preset handover success judgment rule and first refrigerant flow rate
Rate of change judge the switching mechanism execute the compression cylinder switching action whether successfully include:
The first rate of change threshold value is obtained, the first refrigerant flow rate rate of change and the first rate of change threshold value are carried out
It compares, judges that the switching mechanism executes whether the compression cylinder switching action succeeds based on comparison result.
3. method according to claim 2, described to judge that the switching mechanism executes the compression cylinder and cuts based on comparison result
Move work whether successfully include:
If the first refrigerant flow rate rate of change is greater than or equal to the first rate of change threshold value, it is determined that the switching
Mechanism executes the compression cylinder switching action success；
If the first refrigerant flow rate rate of change is less than the first rate of change threshold value, it is determined that the switching mechanism is held
The row compression cylinder switching action failure.
4. the method as described in claim 1, the refrigerant flow rate detection device being arranged on refrigerant pipeline that obtains is switching
Mechanism executes the first refrigerant flow rate acquired before compression cylinder switching action, executes compression cylinder switching in the switching mechanism
The second refrigerant flow rate of acquisition includes: after movement
When determining that the switching mechanism needs to be implemented the compression cylinder switching action, the refrigerant stream in the refrigerant pipeline is judged
Whether speed is stable, if it is, obtaining first refrigerant flow rate；
After the switching mechanism executes the compression cylinder switching action, second refrigerant is obtained by preset first duration
Flow velocity.
5. method as claimed in claim 4, whether the refrigerant flow rate judged in the refrigerant pipeline is stable to include:
Obtain the third refrigerant flow rate and the 4th refrigerant stream of preset second duration collection in refrigerant flow rate detection device interval
Speed；
The second refrigerant flow rate rate of change is obtained based on the third refrigerant flow rate and the 4th refrigerant flow rate；
Judged in the refrigerant pipeline according to preset flow speed stability judgment rule and the second refrigerant flow rate rate of change
Whether refrigerant flow rate is stable.
6. method as claimed in claim 5, described according to preset flow speed stability judgment rule and second refrigerant flow rate
Rate of change judges whether the refrigerant flow rate in the refrigerant pipeline is stable
The second rate of change threshold value is obtained, the second refrigerant flow rate rate of change and the second rate of change threshold value are carried out
It compares, judges whether the refrigerant flow rate in the refrigerant pipeline is stable based on comparison result.
7. whether method as claimed in claim 6, described judge the refrigerant flow rate in the refrigerant pipeline based on comparison result
Stabilization includes:
If the second refrigerant flow rate rate of change is greater than the second rate of change threshold value, it is determined that in the refrigerant pipeline
Refrigerant flow rate it is unstable；
If the second refrigerant flow rate rate of change is less than or equal to the second rate of change threshold value, it is determined that the refrigerant
Refrigerant flow rate in pipeline is stablized.
It is described to obtain the based on the third refrigerant flow rate and the 4th refrigerant flow rate 8. method as claimed in claim 5
Two refrigerant flow rate rate of changes include:
The absolute value of the difference for obtaining the 4th refrigerant flow rate and the third refrigerant flow rate, when by this absolute value with described second
Long ratio is as the second refrigerant flow rate rate of change.
9. method as claimed in claim 4, further includes:
If it is determined that the refrigerant flow rate in the refrigerant pipeline is unstable, then alarm information is sent.
It is described to obtain the based on first refrigerant flow rate and second refrigerant flow rate 10. the method as described in claim 1
One refrigerant flow rate rate of change includes:
The absolute value of the difference for obtaining first refrigerant flow rate and second refrigerant flow rate, when by this absolute value with described first
Long ratio is as the first refrigerant flow rate rate of change.
11. the method for claim 1, wherein
The refrigerant pipeline includes: the export pipeline of the entrance pipe of positive displacement compressor, positive displacement compressor.
12. a kind of judgment means of positive displacement compressor transfiguration switching characterized by comprising
Refrigerant flow rate obtains module, executes for obtaining the refrigerant flow rate detection device being arranged on refrigerant pipeline in switching mechanism
The first refrigerant flow rate for acquiring before compression cylinder switching action, after the switching mechanism executes the compression cylinder switching action
Second refrigerant flow rate of acquisition；
Rate of change obtains module, for obtaining the first refrigerant stream based on first refrigerant flow rate and second refrigerant flow rate
Fast rate of change；
Handover operation judgment module, for according to preset handover success judgment rule and the first refrigerant flow rate rate of change
Judge that the switching mechanism executes whether the compression cylinder switching action succeeds.
13. device as claimed in claim 12, wherein
The handover operation judgment module, for obtaining the first rate of change threshold value；By the first refrigerant flow rate rate of change
It is compared with the first rate of change threshold value, judges that the switching mechanism executes the compression cylinder switching based on comparison result
Whether movement succeeds.
14. device as claimed in claim 13, wherein
The handover operation judgment module becomes if being greater than or equal to described first for the first refrigerant flow rate rate of change
Change rate-valve value, it is determined that the switching mechanism executes the compression cylinder switching action success；If first refrigerant flow rate
Rate of change is less than the first rate of change threshold value, it is determined that the switching mechanism executes the compression cylinder switching action and loses
It loses.
15. device as claimed in claim 12, wherein
The refrigerant flow rate obtains module, comprising:
State judging unit, for when determining that the switching mechanism needs to be implemented the compression cylinder switching action, described in judgement
Whether the refrigerant flow rate in refrigerant pipeline is stable；
Flow velocity obtaining unit obtains first refrigerant flow rate if stablized for the refrigerant flow rate in the refrigerant pipeline；
After the switching mechanism executes the compression cylinder switching action, the second refrigerant stream is obtained by preset first duration
Speed.
16. device as claimed in claim 15, wherein
The state judging unit, for obtaining the third of preset second duration collection in refrigerant flow rate detection device interval
Refrigerant flow rate and the 4th refrigerant flow rate；The second refrigerant flow rate is obtained based on the third refrigerant flow rate and the 4th refrigerant flow rate
Rate of change；The refrigerant pipeline is judged according to preset flow speed stability judgment rule and the second refrigerant flow rate rate of change
In refrigerant flow rate it is whether stable.
17. device as claimed in claim 16, wherein
The state judging unit, for obtaining the second rate of change threshold value；By the second refrigerant flow rate rate of change and institute
It states the second rate of change threshold value to be compared, judges whether the refrigerant flow rate in the refrigerant pipeline is stable based on comparison result.
18. device as claimed in claim 17, wherein
The state judging unit, if being also used to the second refrigerant flow rate rate of change greater than the second rate of change threshold
Value, it is determined that the refrigerant flow rate in the refrigerant pipeline is unstable；If the second refrigerant flow rate rate of change is less than or waits
In the second rate of change threshold value, it is determined that the refrigerant flow rate in the refrigerant pipeline is stablized.
19. the method described in claim 16, wherein
The state judging unit, for obtaining the absolute value of the difference of the 4th refrigerant flow rate and the third refrigerant flow rate,
Using this absolute value and the ratio of second duration as the second refrigerant flow rate rate of change.
20. device as claimed in claim 15, wherein
The refrigerant flow rate obtains module, comprising:
Alarm Unit, for if it is determined that the refrigerant flow rate in the refrigerant pipeline is unstable, then sending alarm information.
21. device as claimed in claim 12, wherein
The rate of change obtains module, for obtain first refrigerant flow rate and second refrigerant flow rate difference it is absolute
Value, using this absolute value and the ratio of first duration as the first refrigerant flow rate rate of change.
22. device as claimed in claim 12, wherein
The refrigerant pipeline includes: the export pipeline of the entrance pipe of positive displacement compressor, positive displacement compressor.
23. a kind of judgment means of positive displacement compressor transfiguration switching, comprising:
Memory；And it is coupled to the processor of the memory, the processor is configured to based on the storage is stored in
Instruction in device executes the method as described in any one of claims 1 to 11.
24. a kind of control device characterized by comprising
The judgment means of positive displacement compressor transfiguration switching as described in claim 12 to 23 any one.
25. a kind of positive displacement compressor characterized by comprising
Control device as claimed in claim 24.
26. a kind of air-conditioner set characterized by comprising
Positive displacement compressor as claimed in claim 25.
27. a kind of computer readable storage medium, the computer-readable recording medium storage has computer instruction, described instruction
It is executed by processor the method as described in any one of claims 1 to 11.
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| CN201811219728.8A CN109357453B (en) | 2018-10-19 | 2018-10-19 | Method and device for judging variable capacity switching of variable capacity compressor and control device |
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| CN201811219728.8A CN109357453B (en) | 2018-10-19 | 2018-10-19 | Method and device for judging variable capacity switching of variable capacity compressor and control device |
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Cited By (1)
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| CN110940114A (en) * | 2019-10-28 | 2020-03-31 | 珠海格力电器股份有限公司 | Control method for reducing oil shortage and liquid impact faults during operation of air conditioner and air conditioner |
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