CN107940843A - A kind of frequency-changeable compressor reduces the control method and device of compression ratio - Google Patents
A kind of frequency-changeable compressor reduces the control method and device of compression ratio Download PDFInfo
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- CN107940843A CN107940843A CN201711071769.2A CN201711071769A CN107940843A CN 107940843 A CN107940843 A CN 107940843A CN 201711071769 A CN201711071769 A CN 201711071769A CN 107940843 A CN107940843 A CN 107940843A
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- compression ratio
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- compressor
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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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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides the control method and device that a kind of frequency-changeable compressor reduces compression ratio, it is related to air-conditioning technical field.By gathering the operational data of compressor, then and the compression ratio of compressor is calculated, when the compression ratio of compressor is more than specified compression ratio, calculate the discharge superheat of compressor, the aperture of electric expansion valve is finally adjusted according to the discharge superheat.Frequency-changeable compressor provided by the invention, which reduces the control method of compression ratio and device, to be had the advantages that to have reached the compression ratio for reducing compressor on the premise of compressor performance is not reduced.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly to a kind of frequency-changeable compressor reduce the control method of compression ratio with
Device.
Background technology
In frequency-changeable compressor operational process, when compression ratio increase can seriously affect the reliability of compressor.First can make
The gas transmission coefficient of compressor reduces, and displacement is reduced, and causes refrigerating capacity to decline.Second can rise the delivery temperature of compressor,
The temperature of cylinder body rises, and influences the lubrication of machine movement part, it is possible to cause the knot carbon phenomenon of refrigerator oil, ultimately cause
Oil starvation press card cylinder.3rd can make loss increase, the steam produced after throttling caused by liquid refrigerant throttling increase, make
Specific refrigerating effect is reduced, and the coefficient of refrigerating performance of circulation reduces.4th can make compressor redundant gap volume reflation, and efficiency reduces, efficiency
Plateau.
Compression ratio is the ratio for being vented absolute pressure (MPa) and air-breathing absolute pressure (MPa).Compress under normal circumstances
Compression ratio is within 2~8 during machine manufacturer requires operation of air conditioner.When compression ratio is all above pressing less than 2, or more than 8
The scope of contracting machine reliability service.
And during the use of refrigerating field especially air-conditioning products, also to be run in some special operating modes, such as
Russian area, interior use heating, and outdoor temperature is very low, so some clients also want air-conditioning to improve indoor temperature；Or
Some specific occasions, such as the occasion such as KTV, singing-hall, dance hall.Outside environment temperature is relatively low, but indoor temperature is higher, this
Client will also freeze by air-conditioning when a.The compression ratio mistake of compressor just occurs when air-conditioning is run under these operating modes
High phenomenon, if being adjusted not in time, eventually influences the service life of air-conditioning.
The mode of the compression ratio of the reduction compressor generally used at present is reduces the frequency of compressor, so that reaching has
The effect of the compression ratio of the reduction compressor of effect.But although it can be effectively reduced by way of reducing compressor frequency
The compression ratio of compressor, but since the working frequency of compressor directly determines the refrigeration of air-conditioning or the ability of heating, so
While the compression ratio of compressor is reduced, the performance of air-conditioning can be directly reduced.
How to solve the above problems, be the emphasis of those skilled in the art's concern.
The content of the invention
In view of this, it is existing to solve the present invention is directed to propose a kind of frequency-changeable compressor reduces the control method of compression ratio
The problem of reducing the performance of air-conditioning while the compression ratio of frequency-changeable compressor is reduced in technology.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
The present invention provides the control method that a kind of frequency-changeable compressor reduces compression ratio, the frequency-changeable compressor reduces pressure
The control method of contracting ratio includes：
Gather pressure at expulsion, pressure of inspiration(Pi) and the delivery temperature of a frequency-changeable compressor；
The compression ratio of the frequency-changeable compressor is calculated according to the pressure at expulsion and the pressure of inspiration(Pi)；
When the compression ratio is more than default specified compression, according to described in the delivery temperature and saturation temperature calculating
The discharge superheat of compressor；Wherein, the saturation temperature is obtained according to the pressure at expulsion and presetting saturation temperature curve
Go out；
The aperture of an electric expansion valve is adjusted according to the discharge superheat, by the compression ratio of the frequency-changeable compressor
It is reduced to the first compression ratio.
Relative to the prior art, frequency-changeable compressor of the present invention reduces the control method of compression ratio with following excellent
Gesture：
Frequency-changeable compressor provided by the invention reduces the control method of compression ratio by gathering compressor relevant parameter, so
After calculate compression ratio, if the compression ratio calculated is more than default specified compression ratio, calculate the discharge superheat of compressor
Degree, and according to the aperture of degree of superheat adjusting electric expansion valve, so as to reduce the compression ratio of the frequency-changeable compressor.Due to compressor
Compression ratio be the ratio of pressure at expulsion and pressure of inspiration(Pi), when increasing electric expansion valve, be capable of the pressure of inspiration(Pi) of lifting system
Power, so as to reach the effect for reducing compression ratio.And due to the present invention by adjust the aperture of electric expansion valve realize reduce
The effect of compression ratio, and do not control the frequency of compressor to reduce, so the performance of compressor will not be reduced, realize not
Having reached on the premise of reducing compressor performance reduces the effect of compression ratio.
Another object of the present invention is to propose that a kind of frequency-changeable compressor reduces the control device of compression ratio, the frequency conversion
The control device that compressor reduces compression ratio includes：
Data acquisition unit, for gathering pressure at expulsion, pressure of inspiration(Pi) and the delivery temperature of a frequency-changeable compressor；
Compression ratio computing unit, for calculating the frequency-changeable compressor according to the pressure at expulsion and the pressure of inspiration(Pi)
Compression ratio；
Discharge superheat computing unit, for when the compression ratio is more than default specified compression ratio, according to the row
Temperature degree calculates the discharge superheat of the compressor with saturation temperature；Wherein, the saturation temperature is according to the pressure at expulsion
Drawn with presetting saturation temperature curve；
Electric expansion valve adjustment unit, will for adjusting the aperture of an electric expansion valve according to the discharge superheat
The compression ratio of the frequency-changeable compressor is reduced to the first compression ratio.
The frequency-changeable compressor, which reduces the control device of compression ratio and above-mentioned frequency-changeable compressor, reduces the control dress of compression ratio
Put identical relative to advantage possessed by the prior art, details are not described herein.
Brief description of the drawings
The attached drawing for forming the part of the present invention is used for providing a further understanding of the present invention, and of the invention is schematic
Embodiment and its explanation are used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the partial process view of the control method of the frequency-changeable compressor reduction compression ratio described in the embodiment of the present invention.
Fig. 2 is another part flow of the control method of the frequency-changeable compressor reduction compression ratio described in the embodiment of the present invention
Figure.
Fig. 3 is that the part of module for the control device that the frequency-changeable compressor described in the embodiment of the present invention reduces compression ratio is illustrated
Figure.
Fig. 4 is another part module of the control device of the frequency-changeable compressor reduction compression ratio described in the embodiment of the present invention
Schematic diagram.
Description of reference numerals：
100- frequency-changeable compressors reduce the control device of compression ratio；110- data acquisition units；120- compression ratios calculate single
Member；130- judging units；140- discharge superheat computing units；150- electric expansion valve adjustment units；160- frequency reducings control is single
Member；170- frequency reducing stop elements；180- raising frequency control units；190- raising frequency stop elements.
Embodiment
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Below with reference to the accompanying drawings and the present invention will be described in detail in conjunction with the embodiments.
Include controller in air-conditioning, controller can control compressor to carry out raising frequency or frequency reducing, while control electronics
The work of expansion valve, i.e., frequency-changeable compressor frequency reducing control device provided in an embodiment of the present invention are embedded in the controller of air-conditioning.
Please refer to Fig.1 and Fig. 2, Fig. 1 show the stream of frequency-changeable compressor frequency reducing control method provided in an embodiment of the present invention
Cheng Tu, is below described in detail the idiographic flow shown in Fig. 1.
Step S101, gathers pressure at expulsion, pressure of inspiration(Pi) and the delivery temperature of a frequency-changeable compressor.
In the course of work of compressor, if compression ratio is excessive, cause compressor damage, so as to influence compressor
Service life, so need in actual use, when the compression ratio of compressor is excessive, the pressure of compressor need to be reduced
Contracting ratio, to ensure that compressor works in the state of normal compression ratio.So in order to judge compressor during the work time
Compression ratio whether be higher than specified compression ratio, the data of corresponding compressor need to be gathered first.Wherein, the exhaust of compressor
Pressure refers to the pressure of compressor exhaust ports, can detect that by being arranged at the pressure sensor at exhaust outlet of compressor；Compression
The pressure of inspiration(Pi) of machine refers to the pressure at compressor air entry, can be examined by being arranged at the pressure sensor at compressor air suction mouth
Measure.
It should be noted that the compressor described in the present embodiment is frequency-changeable compressor.
Step S102, the compression ratio of the frequency-changeable compressor is calculated according to the pressure at expulsion and the pressure of inspiration(Pi).
After the related data of compressor is acquired, the compression ratio of compressor need to be calculated according to the data of compressor.Pressure
The compression ratio of contracting machine can be calculated by formula pd+1/ps+1, wherein, pd is the pressure at expulsion of compressor, and ps is compressor
Pressure of inspiration(Pi).
Step S103, judges whether the compression ratio is more than presetting specified compression ratio, if it is, performing step
S104。
Per compressor at work, a specified compression ratio is had, if compression ratio during compressor operating exceedes the volume
Determine compression ratio, then in the process of running compressor may be caused to follow bad.In the present embodiment, specified compression ratio is 7.5,
Of course, in some other embodiments, according to the difference of the performance of compressor, specified compression ratio may there is also difference,
The present embodiment does not do this any restriction.If compression ratio during compressor operating is less than or equal to specified compression ratio, control
Compressor works on, without the compression ratio of compressor is adjusted.
Step S104, the discharge superheat of the compressor is calculated according to the delivery temperature and saturation temperature.
After the compression ratio of compression has been higher than specified compression ratio, compressor may damage during the work time, need to be to pressure
The compression ratio of contracting machine is adjusted, that is, controls the compression ratio of compressor and reduce.At present, generally by controlling compressor to reduce fortune
The mode of line frequency controls compression ratio to reduce.But since the running frequency of compressor directly affects the work energy of compressor
Power, that is, the ability freezed or heated, in view of this, the present embodiment is by way of the aperture for controlling electric expansion valve, so that pressure
The pressure of inspiration(Pi) rise of contracting machine, so as to reach the effect that control compression ratio reduces.
When controlling the aperture of electric expansion valve, controller need to lead to opening for control electric expansion valve according to discharge superheat
Degree.So the present embodiment calculates the discharge superheat of compressor according to formula TDSH=C1-C2；Wherein, TDSH represents frequency conversion
The discharge superheat of compressor, C1 represent the delivery temperature of frequency-changeable compressor, and C2 represents the saturation temperature of frequency-changeable compressor, and
The saturation temperature is drawn according to the pressure at expulsion and presetting saturation temperature curve.
Step S105, the aperture of an electric expansion valve is adjusted according to the discharge superheat, by the frequency-changeable compressor
Compression ratio be reduced to the first compression ratio.
Due to being become larger with the aperture of electric expansion valve, the delivery temperature of compressor can decline, while compressor
Saturation temperature can raise, so that discharge superheat can be gradually reduced.Meanwhile the aperture of electric expansion valve becomes larger, inhale
Atmospheric pressure can also become larger, so as to reduce compression ratio.I.e. during the compression ratio of compressor is reduced, discharge superheat
Degree gradually reduces, meanwhile, in order to make the speed of adjusting electric expansion valve be matched with discharge superheat, the present embodiment is being adjusted
When saving electric expansion valve, the speed that the aperture of electric expansion valve becomes larger is controlled to be dropped with the reduction of discharge superheat
It is low.
Specifically, in the present embodiment, it is by the detailed process of the aperture of discharge superheat adjusting electric expansion valve：
When the value of the discharge superheat is located at the first degree of superheat section, the electronics is adjusted by the 3rd pre-set velocity
The aperture of expansion valve；When the value of the discharge superheat is located at the second degree of superheat section, as described in being adjusted the 4th pre-set velocity
The aperture of electric expansion valve；When the value of the discharge superheat is located at the 3rd degree of superheat section, adjusted by the 5th pre-set velocity
The aperture of the electric expansion valve；When the value of the discharge superheat is located at the 4th degree of superheat section, by the 6th pre-set velocity
Adjust the aperture of the electric expansion valve.
In the present embodiment, the first degree of superheat section is TDSH >=25 degree, the second degree of superheat section for 25 degree of ﹥ TDSH >=
20 degree；3rd degree of superheat section is 20 degree of ﹥ TDSH >=15 degree；4th degree of superheat section is 15 degree of 10 degree of ﹥ TDSH ﹥；5th overheat
Degree section is 10 degree >=TDSH；3rd pre-set velocity is 5PLS/20S；4th pre-set velocity is 5PLS/30S；5th default speed
Spend for 5PLS/45S；6th pre-set velocity is 5PLS/60S.Of course, in some other embodiments, degree of superheat section with
Pre-set velocity can also be other values, and the present embodiment does not do this any restriction.
Step S106, judges whether the discharge superheat is less than presetting limit discharge superheat, if it is,
Step S107 is performed, if it is not, then return to step S105.
Since the value of discharge superheat characterizes the reliability of compressor, if so the value of discharge superheat is too small, press
The reliability of contracting machine easily breaks down deficiency.In view of this, in practical applications, presetting limit discharge superheat is needed
Degree, when the discharge superheat of compressor is down to the limit discharge superheat, need to stop continuing the discharge superheat for reducing compressor
Degree, to ensure the reliability of compressor.In the present embodiment, the value of the default sign discharge superheat is the 5th overheat
Spend the maximum in section.
Step S107, controls the electric expansion valve to stop adjusting.
When in variable expansion valve, the discharge superheat of compressor has equalized to or less than limit discharge superheat, then this
When need to control electric expansion valve stop adjust, that is, stop continue out big electric expansion valve, to ensure the reliability of compressor, this
When compressor compression ratio be adjusted to the first compression ratio.
Step S108, judges whether first compression ratio is more than default specified compression ratio, if it is, performing step
Rapid S109, if it is not, then terminating flow.
After compression ratio is adjusted by way of adjusting electric expansion valve, it is possible that the compression ratio after adjusting remains unchanged
More than specified compression ratio, for example, the aperture by adjusting electric expansion valve, 7.6 are down to by the compression ratio of compressor from 8, and it is pre-
The specified compression ratio of the compressor set then needs further to reduce the compression ratio of compressor as 7.5.
Step S109, controls the frequency-changeable compressor to carry out frequency reducing by the first preset speeds, the frequency conversion is compressed
The compression ratio of machine continues to be down to the second compression ratio.
If the compression ratio after adjusting by way of adjusting electric expansion valve can not resist specified compression ratio, need to pass through
The mode of frequency reducing further reduces compression ratio, i.e., compression ratio is down to the second compression ratio by way of frequency reducing.While, it is necessary to
Illustrate, due to that need to achieve the purpose that compression ratio is down in specified compression ratio range as early as possible, compressor need to be controlled with larger
Speed carry out frequency reducing, control in the present embodiment compressor to carry out frequency reducing with 5% speed of reduction current frequency per minute.
Step S110, judges whether second compression ratio is less than or equal to default security compression ratio, if it is,
Step S111 is performed, if it is not, then return to step S109.
After compression ratio is down in specified compression ratio range by way of frequency reducing, frequency reducing process need to be stopped, so this
Also presetting in embodiment to have security compression ratio, which is less than specified compression ratio.Since compressor is in specified compression
Work than in the state of as optimal working status, so after the compression ratio of compressor is more than specified compression ratio, compression need to be reduced
Than.But due to reducing when reducing compression ratio using the mode of frequency reducing, due to frequency reducing speed, so causing compressor
Compressor can be continued to decline after specified compression ratio is down to due to inertia, i.e., so that compressor is from a specified compression
Than working.
In view of this, the present embodiment will be compressed by way of setting security compression ratio with the first larger pre-set velocity
Than be decreased to less than or equal to security compression ratio after, then control compressor to carry out raising frequency with relatively low the second pre-set velocity so that pressure
Contracting machine works in this raising frequency to specified compression ratio.Specified compression ratio in the present embodiment is 7.5, and security compression ratio is
7。
Step S111, controls the frequency-changeable compressor to stop frequency reducing.
When compressor is during frequency reducing, the compression ratio of compressor is decreased to less than or during equal to security compression ratio, then controllable
Compressor processed stops frequency reducing.
Step S112, controls the frequency-changeable compressor to carry out raising frequency by the second pre-set velocity, is compressed with lifting the frequency conversion
The compression ratio of machine.
After the compression ratio of compressor is decreased to less than or equal to security compression ratio, in order to make compressor be in higher
Work under performance state, compressor need to be controlled to carry out raising frequency again, meanwhile, the second pre-set velocity during compressor raising frequency
The first pre-set velocity during less than frequency reducing.In the present embodiment, compressor carries out raising frequency with the speed of 1hz/30s.
Step S113, judges whether the compression ratio of the frequency-changeable compressor is promoted to equal to the default specified compression
Than if it is, step S114 is performed, if it is not, then return to step S112.
During the gradual raising frequency of compressor, compression ratio is also gradually increasing, when the compression ratio of compressor rise to it is specified
During compression ratio, then compressor can control to stop raising frequency.At the same time, it is necessary to illustrate, since compressor is risen with low speed at this time
Frequently, so as to being accurately parked in the position of specified compression ratio.
Step S114, controls the frequency-changeable compressor to stop raising frequency.
When the compression ratio of compressor rises to specified compression ratio, then can control compressor stop raising frequency so that compressor with
Specified compression ratio works.
It should be noted that the method that frequency-changeable compressor provided in this embodiment reduces compression ratio, substantially utilizes adjusting
The mode of the aperture of electric expansion valve and the working frequency of frequency reducing compressor reaches the effect for reducing compressor pressure ratios jointly
Fruit.And if the compression ratio of compressor can be down in specified compression ratio range by the aperture by adjusting electric expansion valve, nothing
The working frequency of compressor need to be reduced again, be worked all the time with higher frequency so as to reach and make compressor, ensure that pressure
The ability to work of contracting machine.
Second embodiment
Fig. 3 and Fig. 4 are referred to, is that the frequency-changeable compressor shown in Fig. 1 of present pre-ferred embodiments offer reduces compression ratio
Control device 100 functional unit schematic diagram.It should be noted that the frequency-changeable compressor that the present embodiment is provided reduces pressure
The technique effect of the control device 100 of contracting ratio, its basic principle and generation is identical with above-described embodiment, to briefly describe, this hair
Bright embodiment part does not refer to part, refers to corresponding contents in the above embodiments.The frequency-changeable compressor reduces compression ratio
Control device 100 include data acquisition unit 110, compression ratio computing unit 120, judging unit 130, discharge superheat meter
Calculate unit 140, electric expansion valve adjustment unit 150, frequency reducing control unit 160, frequency reducing stop element 170, raising frequency control unit
180th, raising frequency stop element 190.
Data acquisition unit 110, for the pressure at expulsion of a frequency-changeable compressor, pressure of inspiration(Pi) and delivery temperature.
It should be understood that step S101 can perform by data acquisition unit 110.
Compression ratio computing unit 120, compresses for calculating the frequency conversion according to the pressure at expulsion and the pressure of inspiration(Pi)
The compression ratio of machine.
It should be understood that step S102 can perform by compression ratio computing unit 120.
Judging unit 130, for judging whether the compression ratio is more than presetting specified compression ratio.
It should be understood that step S103 can perform by judging unit 130.
Discharge superheat computing unit 140, for calculating the compressor according to the delivery temperature and saturation temperature
Discharge superheat.
It should be understood that step S104 can perform by discharge superheat computing unit 140.
Electric expansion valve adjustment unit 150, for adjusting the aperture of an electric expansion valve according to the discharge superheat,
The compression ratio of the frequency-changeable compressor is reduced to the first compression ratio.
It should be understood that step S105 can perform by electric expansion valve adjustment unit 150.
Wherein, electric expansion valve adjustment unit 150 includes adjustment module.
Judging unit 130, for judging whether the discharge superheat is less than presetting limit discharge superheat.
It should be understood that step S106 can perform by judging unit 130.
Electric expansion valve adjustment unit 150 is additionally operable to control the electric expansion valve to stop adjusting.
It should be understood that step S107 can perform by electric expansion valve adjustment unit 150.
Judging unit 130 is additionally operable to judge whether first compression ratio is more than default specified compression ratio.
It should be understood that step S108 can perform by judging unit 130.
Frequency reducing control unit 160, will for controlling the frequency-changeable compressor to carry out frequency reducing by the first preset speeds
The compression ratio of the frequency-changeable compressor continues to be down to the second compression ratio.
It should be understood that step S109 can perform by frequency reducing control unit 160.
Judging unit 130 is additionally operable to judge whether second compression ratio is less than or equal to default security compression ratio.
It should be understood that step S110 can perform by judging unit 130.
Frequency reducing stop element 170, for controlling the frequency-changeable compressor to stop frequency reducing.
It should be understood that step S111 can perform by frequency reducing stop element 170.
Raising frequency control unit 180, for controlling the frequency-changeable compressor to carry out raising frequency by the second pre-set velocity, with lifting
The compression ratio of the frequency-changeable compressor.
It should be understood that step S112 can perform by raising frequency control unit 180.
It is described equal to default that judging unit 130 is additionally operable to judge whether the compression ratio of the frequency-changeable compressor is promoted to
Specified compression ratio.
It should be understood that step S113 can perform by judging unit 130.
Raising frequency stop element 190, for controlling the frequency-changeable compressor to stop raising frequency.
It should be understood that step S114 can perform by raising frequency stop element 190.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.
Claims (10)
1. a kind of frequency-changeable compressor reduces the control method of compression ratio, it is characterised in that the frequency-changeable compressor reduces compression ratio
Control method include：
Gather pressure at expulsion, pressure of inspiration(Pi) and the delivery temperature of a frequency-changeable compressor；
The compression ratio of the frequency-changeable compressor is calculated according to the pressure at expulsion and the pressure of inspiration(Pi)；
When the compression ratio is more than default specified compression ratio, the compression is calculated according to the delivery temperature and saturation temperature
The discharge superheat of machine；Wherein, the saturation temperature is drawn according to the pressure at expulsion and presetting saturation temperature curve；
The aperture of an electric expansion valve is adjusted according to the discharge superheat, the compression ratio of the frequency-changeable compressor is reduced to
First compression ratio.
2. frequency-changeable compressor according to claim 1 reduces the control method of compression ratio, it is characterised in that in the foundation
The discharge superheat adjusts the aperture of an electric expansion valve, and the compression ratio of the frequency-changeable compressor is reduced to the first compression
Than the step of after, the control method that the frequency-changeable compressor reduces compression ratio further includes：
When first compression ratio is more than the default specified compression ratio, control the frequency-changeable compressor presetting by first
Speed carries out frequency reducing, and the compression ratio of the frequency-changeable compressor is continued to be down to the second compression ratio；
When second compression ratio is less than or equal to default security compression ratio, the frequency-changeable compressor is controlled to stop frequency reducing.
3. frequency-changeable compressor according to claim 2 reduces the control method of compression ratio, it is characterised in that works as institute described
When stating the second compression ratio and being less than or equal to default security compression ratio, the step of controlling the frequency-changeable compressor to stop frequency reducing it
Afterwards, the control method of the frequency-changeable compressor reduction compression ratio further includes：
The frequency-changeable compressor is controlled to carry out raising frequency by the second pre-set velocity, to lift the compression ratio of the frequency-changeable compressor；Its
In, second pre-set velocity is less than first pre-set velocity；
When the compression ratio of the frequency-changeable compressor is promoted to equal to the default specified compression ratio, the frequency conversion is controlled to compress
Machine stops raising frequency.
4. frequency-changeable compressor according to claim 1 reduces the control method of compression ratio, it is characterised in that described according to institute
The aperture that discharge superheat adjusts an electric expansion valve is stated, the compression ratio of the frequency-changeable compressor is reduced to the first compression ratio
The step of include：
When the value of the discharge superheat is located at the first degree of superheat section, the electric expansion valve is adjusted by the 3rd pre-set velocity
Aperture；
When the value of the discharge superheat is located at the second degree of superheat section, the electric expansion valve is adjusted by the 4th pre-set velocity
Aperture；
When the value of the discharge superheat is located at the 3rd degree of superheat section, the electric expansion valve is adjusted by the 5th pre-set velocity
Aperture；
When the value of the discharge superheat is located at the 4th degree of superheat section, the electric expansion valve is adjusted by the 6th pre-set velocity
Aperture.
5. frequency-changeable compressor according to claim 4 reduces the control method of compression ratio, it is characterised in that described according to institute
The aperture that discharge superheat adjusts an electric expansion valve is stated, the compression ratio of the frequency-changeable compressor is reduced to the first compression ratio
The step of further include：
When the value of the discharge superheat is located at the 5th degree of superheat section, the electric expansion valve is controlled to stop adjusting；Wherein,
The maximum in the 5th degree of superheat section is equal to default limit discharge superheat.
6. a kind of frequency-changeable compressor reduces the control device of compression ratio, it is characterised in that the frequency-changeable compressor reduces compression ratio
Control device include：
Data acquisition unit 110, for gathering pressure at expulsion, pressure of inspiration(Pi) and the delivery temperature of a frequency-changeable compressor；
Compression ratio computing unit 120, for calculating the frequency-changeable compressor according to the pressure at expulsion and the pressure of inspiration(Pi)
Compression ratio；
Discharge superheat computing unit 140, for when the compression ratio is more than default specified compression ratio, according to the exhaust
Temperature calculates the discharge superheat of the compressor with saturation temperature；Wherein, the saturation temperature according to the pressure at expulsion with
Presetting saturation temperature curve is drawn；
Electric expansion valve adjustment unit 150, for adjusting the aperture of an electric expansion valve according to the discharge superheat, by institute
The compression ratio for stating frequency-changeable compressor is reduced to the first compression ratio.
7. frequency-changeable compressor according to claim 6 reduces the control device of compression ratio, it is characterised in that the frequency conversion pressure
The control device that contracting machine reduces compression ratio further includes：
Frequency reducing control unit 160, for when first compression ratio is more than the default specified compression ratio, controlling the change
Frequency compressor carries out frequency reducing by the first preset speeds, and the compression ratio of the frequency-changeable compressor is continued to be down to the second compression
Than；
Frequency reducing stop element 170, for when second compression ratio is less than or equal to default security compression ratio, described in control
Frequency-changeable compressor stops frequency reducing.
8. frequency-changeable compressor according to claim 7 reduces the control device of compression ratio, it is characterised in that the frequency conversion pressure
The control device that contracting machine reduces compression ratio further includes：
Raising frequency control unit 180, for controlling the frequency-changeable compressor to carry out raising frequency by the second pre-set velocity, to lift the change
The compression ratio of frequency compressor；Wherein, second pre-set velocity is less than first pre-set velocity；
Raising frequency stop element 190, for being promoted to when the compression ratio of the frequency-changeable compressor equal to the default specified compression
Than when, control the frequency-changeable compressor to stop raising frequency.
9. frequency-changeable compressor according to claim 6 reduces the control device of compression ratio, it is characterised in that the electronics is swollen
Swollen valve regulation unit includes：
Adjustment module, for when the value of the discharge superheat is located at the first degree of superheat section, being adjusted by the 3rd pre-set velocity
The aperture of the electric expansion valve；
The adjustment module is additionally operable to when the value of the discharge superheat is located at the second degree of superheat section, by the 4th pre-set velocity
Adjust the aperture of the electric expansion valve；
The adjustment module is additionally operable to when the value of the discharge superheat is located at the 3rd degree of superheat section, by the 5th pre-set velocity
Adjust the aperture of the electric expansion valve；
The adjustment module is additionally operable to when the value of the discharge superheat is located at the 4th degree of superheat section, by the 6th pre-set velocity
Adjust the aperture of the electric expansion valve.
10. frequency-changeable compressor according to claim 9 reduces the control device of compression ratio, the adjustment module is additionally operable to work as
When the value of the discharge superheat is located at the 5th degree of superheat section, the electric expansion valve is controlled to stop adjusting；Wherein, described
The maximum in five degree of superheat sections is equal to default limit discharge superheat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711071769.2A CN107940843A (en) | 2017-11-03 | 2017-11-03 | A kind of frequency-changeable compressor reduces the control method and device of compression ratio |
Applications Claiming Priority (1)
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| CN108444142A (en) * | 2018-05-17 | 2018-08-24 | 广东美的制冷设备有限公司 | Air-conditioner control method and air conditioner |
| CN110332742A (en) * | 2019-07-08 | 2019-10-15 | 广东Tcl智能暖通设备有限公司 | Hot water apparatus and heat pump system control method, heat pump system control device |
| CN110388772A (en) * | 2019-07-01 | 2019-10-29 | 重庆美的通用制冷设备有限公司 | Control method, device and the heat pump air conditioner of heat pump air conditioner electric expansion valve |
| CN111595000A (en) * | 2020-05-18 | 2020-08-28 | 广东美的暖通设备有限公司 | Air conditioning system, control method and device of hydraulic module of air conditioning system and storage medium |
| CN112664455A (en) * | 2019-10-15 | 2021-04-16 | 广东芬尼克兹节能设备有限公司 | Lubrication adjusting method and device for compressor, electronic equipment and storage medium |
| CN113188246A (en) * | 2021-04-25 | 2021-07-30 | 珠海格力电器股份有限公司 | Method and device for adjusting running frequency of compressor and electronic equipment |
| CN113465115A (en) * | 2021-05-28 | 2021-10-01 | 宁波奥克斯电气股份有限公司 | Pressure ratio control method and device and air conditioner |
| CN114484953A (en) * | 2022-02-07 | 2022-05-13 | 青岛海尔空调电子有限公司 | Heat pump unit and control method thereof |
| CN117345630A (en) * | 2023-12-05 | 2024-01-05 | 珠海格力电器股份有限公司 | Control method and device of variable frequency screw compressor, electronic equipment and storage medium |
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| CN113188246A (en) * | 2021-04-25 | 2021-07-30 | 珠海格力电器股份有限公司 | Method and device for adjusting running frequency of compressor and electronic equipment |
| CN113465115A (en) * | 2021-05-28 | 2021-10-01 | 宁波奥克斯电气股份有限公司 | Pressure ratio control method and device and air conditioner |
| CN114484953A (en) * | 2022-02-07 | 2022-05-13 | 青岛海尔空调电子有限公司 | Heat pump unit and control method thereof |
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