CN106247573B - Air conditioner and its compressor return liquid judgment method and device - Google Patents
Air conditioner and its compressor return liquid judgment method and device Download PDFInfo
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- CN106247573B CN106247573B CN201610859399.8A CN201610859399A CN106247573B CN 106247573 B CN106247573 B CN 106247573B CN 201610859399 A CN201610859399 A CN 201610859399A CN 106247573 B CN106247573 B CN 106247573B
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- compressor
- polytropic index
- air conditioner
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- liquid
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
-
- 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
Abstract
The invention discloses a kind of air conditioners and its compressor to return liquid judgment method and device, and the compressor returns liquid judgment method the following steps are included: obtaining suction temperature, delivery temperature, back pressure and the pressure at expulsion of compressor；The polytropic index of compressor is calculated according to the suction temperature of compressor, delivery temperature, back pressure and pressure at expulsion；Judge that compressor whether there is back liquid risk according to polytropic index.This method accurately can judge whether compressor occurs back liquid, to improve air conditioner reliability of operation by the polytropic index of calculating compressor.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of compressor of air conditioner returns liquid judgment method, Yi Zhongkong
The compressor of device is adjusted to return liquid judgment means and a kind of air conditioner.
Background technique
Since the operating status and system of air conditioner control, often there is a situation where compressors to return liquid for air conditioner.Such as
Liquid occurs back for the compressor of fruit air conditioner, and biggish damage can be caused to compressor, compressor can be burnt out when serious, to influence
The reliability service of air conditioner.
In the related technology, compressor returns liquid in order to prevent, in air conditioner operation, the general exhaust for requiring control compressor
The degree of superheat returns the probability of liquid by reducing compressor to the control of discharge superheat within a certain range.But this side
Method cannot accurately judge whether compressor returns liquid, and the probability of erroneous judgement is higher.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First purpose is to propose that a kind of compressor of air conditioner returns liquid judgment method, the multi-party finger that this method passes through calculating compressor
Number, accurately can judge whether compressor occurs back liquid, to improve air conditioner reliability of operation.
Second object of the present invention is to propose that a kind of compressor of air conditioner returns liquid judgment means.
Third object of the present invention is to propose a kind of air conditioner.
In order to achieve the above objectives, the compressor that one aspect of the present invention embodiment proposes air conditioner returns liquid judgment method, packet
It includes following steps: obtaining suction temperature, delivery temperature, back pressure and the pressure at expulsion of the compressor；According to the compression
Suction temperature, delivery temperature, back pressure and the pressure at expulsion of machine calculate the polytropic index of the compressor；According to described multi-party
Index judges that the compressor whether there is back liquid risk.
Compressor according to an embodiment of the present invention returns liquid judgment method, firstly, obtaining the suction temperature of compressor, exhaust temperature
Degree, back pressure and pressure at expulsion, then, according to the suction temperature of compressor, delivery temperature, back pressure and pressure at expulsion meter
The polytropic index for calculating compressor, finally, judging that compressor whether there is back liquid risk according to polytropic index.This method passes through calculating
The polytropic index of compressor accurately can judge whether compressor occurs back liquid, thus improve air conditioner operation can
By property.
According to one embodiment of present invention, it is calculated by the following formula the polytropic index of the compressor: T2/T1=
(P2/P1)(K-1)/K, wherein K is the polytropic index of the compressor, and T1 is the suction temperature of the compressor, and T2 is the pressure
The delivery temperature of contracting machine, P1 are the back pressure of the compressor, and P2 is the pressure at expulsion of the compressor.
According to one embodiment of present invention, described to judge that the compressor whether there is back liquid according to the polytropic index
Risk, comprising: judge whether the polytropic index is in preset range；If the polytropic index is in the preset range,
Then judge that the compressor has back liquid risk.
According to one embodiment of present invention, described to judge the polytropic index whether within a preset range, comprising: to calculate
Difference between the polytropic index and default polytropic index；Judge the difference and the default polytropic index ratio whether
Less than or equal to preset threshold；If the ratio is less than or equal to the preset threshold, judge that the polytropic index is in described
Preset range.
According to one embodiment of present invention, after judging that the compressor has described time liquid risk, also to the sky
The operating status of device is adjusted to be adjusted.
In order to achieve the above objectives, the compressor that second aspect of the present invention embodiment proposes a kind of air conditioner returns liquid judgement dress
It sets, comprising: temperature acquisition module, for obtaining the suction temperature and delivery temperature of the compressor；Pressure acquisition module is used for
Obtain the back pressure and pressure at expulsion of the compressor；Computing module, the computing module obtain mould with the temperature respectively
Block is connected with the pressure acquisition module, for according to the suction temperature of the compressor, delivery temperature, back pressure and exhaust
The polytropic index of compressor described in calculation of pressure；Control module, the control module are connected with the computing module, are used for basis
The polytropic index judges that the compressor whether there is back liquid risk.
The compressor of air conditioner according to an embodiment of the present invention returns liquid judgment means, firstly, being obtained by temperature acquisition module
The suction temperature and delivery temperature of compressor are taken, and obtains the back pressure and exhaust pressure of compressor by pressure acquisition module
Then power is calculated according to the suction temperature of compressor, delivery temperature, back pressure and pressure at expulsion by computing module and is compressed
The polytropic index of machine, finally, judging that compressor whether there is back liquid risk according to polytropic index by control module.The device root
According to the polytropic index of compressor, accurately it can judge whether compressor occurs back liquid, to improve air conditioner operation
Reliability.
According to one embodiment of present invention, the computing module is calculated by the following formula the multi-party finger of the compressor
Number: T2/T1=(P2/P1)(K-1)/K, wherein K is the polytropic index of the compressor, and T1 is the suction temperature of the compressor,
T2 is the delivery temperature of the compressor, and P1 is the back pressure of the compressor, and P2 is the pressure at expulsion of the compressor.
According to one embodiment of present invention, whether the control module judges the compressor according to the polytropic index
When in the presence of returning liquid risk, wherein the control module judges whether the polytropic index is in preset range；If described multi-party
Index is in the preset range, and the control module then judges that the compressor has back liquid risk.
According to one embodiment of present invention, within a preset range whether the control module judge the polytropic index
When, wherein the control module calculates the difference between the polytropic index and default polytropic index；The control module judgement
Whether the ratio of the difference and the default polytropic index is less than or equal to preset threshold；If the ratio is less than or equal to described
Preset threshold, the control module then judge that the polytropic index is in the preset range.
According to one embodiment of present invention, the control module is also used to: judging the compressor in the presence of described time
After liquid risk, the operating status of the air conditioner is adjusted.
In order to achieve the above objectives, third aspect present invention embodiment proposes a kind of air conditioner comprising the present invention second
The compressor of air conditioner described in aspect embodiment returns liquid judgment means.
The air conditioner of the embodiment of the present invention obtains mould by the temperature that the compressor of above-mentioned air conditioner returns liquid judgment means
Block obtains the suction temperature and delivery temperature of compressor, and back pressure and the exhaust of compressor are obtained by pressure acquisition module
Then pressure is calculated according to the suction temperature of compressor, delivery temperature, back pressure and pressure at expulsion by computing module and is pressed
The polytropic index of contracting machine, finally, judging that compressor whether there is back liquid risk according to polytropic index by control module.The air-conditioning
Device accurately can judge whether compressor occurs back liquid according to the polytropic index of compressor, to improve air conditioner fortune
Capable reliability.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein
Fig. 1 is the flow chart that compressor according to an embodiment of the invention returns liquid judgment method；
Fig. 2 is that the compressor of the air conditioner of a specific example according to the present invention returns the flow chart of liquid judgment method；With
And
Fig. 3 is that the compressor of air conditioner according to an embodiment of the invention returns the block diagram of liquid judgment means.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the air conditioner and its compressor to describe proposition of the embodiment of the present invention return liquid judgment method and dress
It sets.
Fig. 1 is the flow chart that compressor according to an embodiment of the invention returns liquid judgment method.As shown in Figure 1, the sky
Adjust device compressor return liquid judgment method the following steps are included:
S1 obtains suction temperature T1, delivery temperature T2, back pressure P1 and the pressure at expulsion P2 of compressor.
S2 calculates compressor according to the suction temperature T1 of compressor, delivery temperature T2, back pressure P1 and pressure at expulsion P2
Polytropic index K.
An implementation according to the present invention, the polytropic index K of compressor is calculated by following formula (1):
T2/T1=(P2/P1)(K-1)/K (1)
Wherein, K is the polytropic index of compressor, and T1 is the suction temperature of compressor, and T2 is the delivery temperature of compressor, P1
For the back pressure of compressor, P2 is the pressure at expulsion of compressor.
It is appreciated that if it is known that T1, T2, P1 and P2 can calculate the multi-party finger of compressor then according to formula (1)
Number K.
S3 judges that compressor whether there is back liquid risk according to polytropic index K.
According to one embodiment of present invention, judge that compressor whether there is back liquid risk according to polytropic index K, comprising:
Judge whether polytropic index K is in preset range；If polytropic index K is in preset range, judge that compressor has back liquid
Risk.
Specifically, judge polytropic index K whether within a preset range, comprising: to calculate polytropic index K and default polytropic index
K0Between difference；Judge difference and default polytropic index K0Ratio whether be less than or equal to preset threshold M；If ratio is less than
Equal to preset threshold M, then judge that polytropic index K is in preset range.
Wherein, polytropic index K is preset0It can be preset according to the actual situation with preset threshold M.Specifically, for every
A compressor has specific polytropic index, can be using this specific polytropic index as default polytropic index K0.It is default
Polytropic index K0It can be and provided by compressor manufacturer, test measurement can also be carried out by air conditioner manufacturer and obtained.Preset threshold M can
Tolerance value with the polytropic index provided for compressor manufacturer, or the multi-party finger that air conditioner manufacturer test measurement obtains
The deviation of several permissions can also be the value between 5%~10%, be not specifically limited herein.
Specifically, when air conditioner is run, obtain the suction temperature T1 of compressor, delivery temperature T2, back pressure P1 and
Pressure at expulsion P2, further according to formula (1), i.e. T2/T1=(P2/P1)(K-1)/KThen the polytropic index K for calculating compressor sentences
It is disconnected whether to meet (K-K0)/K0≤ M judges that compressor has back liquid if so, illustrating that compressor returns liquid or approaches back liquid
Risk.This method accurately can judge whether compressor occurs back liquid as a result,.
It should be noted that polytropic index K only exists small for the compressor of same refrigerant and same model
Deviation, generally a fixed value.For in Hitachi's E405DHD compressor, if its refrigerant is R410A, by a large amount of
Test it can be concluded that, the polytropic index K of this compressor is generally fluctuated between 1.18~1.20.In air conditioner operational process
In, may be as caused by following two situation if polytropic index K deviates from this range: 1, compressor be protected
Warm deficiency causes leakage heat excessive；2 compressors flow back to the refrigerant abnormal state of port, there is non-fully gaseous ingredient, that is, compress
Machine returns liquid.Situation 1 is very rare, and caused by polytropic index K deviation range very little, if polytropic index K deviate range compared with
It is more, then it is likely to as caused by situation 2, it can judge that compressor has back liquid risk.It follows that according to polytropic index
K may determine that compressor whether there is back liquid risk.
According to one embodiment of present invention, after judging that compressor has back liquid risk, also to the operation shape of air conditioner
State is adjusted, so that (K-K0)/K0Reach certain reasonable value, compressor is avoided to return liquid, improves system reliability of operation.
Specifically, it if it is determined that compressor has back liquid, then can be opened by the frequency of compressor, each valve body of outdoor unit
The operating status of air conditioner is adjusted in pass, switch, the rotation speed of fan of each valve body of indoor unit etc., so that (K-K0)/K0Reach one
Fixed reasonable value, this reasonable value can be set to be greater than preset threshold M, return liquid to avoid compressor, and what the system that improves was run can
By property.
To make those skilled in the art be more clearly understood that the present invention, it is exemplified below.
Fig. 2 is that the compressor of the air conditioner of a specific example according to the present invention returns the flow chart of liquid judgment method.Such as
Shown in Fig. 2, the compressor of the air conditioner return liquid judgment method the following steps are included:
S101 obtains suction temperature T1, delivery temperature T2, back pressure P1 and the pressure at expulsion P2 of compressor.
S102, according to formula T2/T1=(P2/P1)(K-1)/KCalculate the polytropic index K of compressor.
S103 judges whether to meet (K-K0)/K0≤M.If so, illustrating that compressor has back liquid risk, step is executed
S104；If not, illustrating that liquid risk is not present back in compressor, step S105 is executed.
The operating status of air conditioner is adjusted in S104, so that (K-K0)/K0Reach certain reasonable value, avoids compressing
Machine returns liquid.
S105, control air conditioner continue to operate normally.
In conclusion compressor according to an embodiment of the present invention returns liquid judgment method, according to the suction temperature of compressor, row
Temperature degree, back pressure and pressure at expulsion calculate the polytropic index of compressor, judge whether compressor is deposited further according to polytropic index
Liquid risk is being returned, and when judging that compressor has back liquid risk, the operating status of air conditioner is being adjusted, so that compressor
Polytropic index reach certain reasonable value, avoid compressor return liquid.Air conditioner reliability of operation is improved as a result,.
Fig. 3 is that the compressor of air conditioner according to an embodiment of the invention returns the block diagram of liquid judgment means.Such as
Shown in Fig. 3, the compressor of the air conditioner returns liquid judgment means and includes: temperature acquisition module 10, pressure acquisition module 20, calculates mould
Block 30 and control module 40.
Wherein, temperature acquisition module 10 is used to obtain the suction temperature T1 and delivery temperature T2 of compressor.Pressure obtains mould
Block 20 is used to obtain the back pressure P1 and pressure at expulsion P2 of compressor.Computing module 30 respectively with temperature acquisition module 10 and pressure
Power obtains module 20 and is connected, for according to the suction temperature T1 of compressor, delivery temperature T2, back pressure P1 and pressure at expulsion P2
Calculate the polytropic index K of compressor.Control module 40 is connected with computing module 30, for judging compressor according to polytropic index K
With the presence or absence of time liquid risk.
According to one embodiment of present invention, computing module 30 calculates the polytropic index of compressor by following formula (1)
K:
T2/T1=(P2/P1)(K-1)/K (1)
Wherein, K is the polytropic index of the compressor, and T1 is the suction temperature of the compressor, and T2 is the compressor
Delivery temperature, P1 be the compressor back pressure, P2 be the compressor pressure at expulsion.
Specifically, when air conditioner is run, temperature acquisition module 10 obtains the suction temperature T1 and delivery temperature of compressor
T2, and T1, T2 are sent to computing module 30, meanwhile, pressure acquisition module 20 obtains back pressure P1 and the exhaust of compressor
Pressure P2, and P1 and P2 are sent to computing module 30.Computing module 30 receives T1, T2 and pressure that temperature acquisition module 10 is sent
Power obtains P1, P2 that module 20 is sent, and according to formula (1), i.e. T2/T1=(P2/P1)(K-1)/KCalculate the multi-party finger of compressor
Number K, and polytropic index K is sent to control module 40.Control module 40 receives the multi-party of the compressor that computing module 30 is sent
Index K, and judge that compressor whether there is back liquid risk according to polytropic index K.The device is according to the multi-party finger of compressor as a result,
Number K, accurately can judge whether compressor occurs back liquid.
According to one embodiment of present invention, control module 40 judges that compressor whether there is back liquid according to polytropic index K
When risk, wherein control module 40 judges whether polytropic index K is in preset range；If polytropic index K is in default model
It encloses, control module 40 then judges that compressor has back liquid risk.
Further, according to one embodiment of present invention, whether control module 40 judges polytropic index K in preset range
When interior, wherein control module 40 calculates polytropic index K and default polytropic index K0Between difference；Control module 40 judges difference
Value and default polytropic index K0Ratio whether be less than or equal to preset threshold M；If ratio is less than or equal to preset threshold M, control
Module 40 then judges that polytropic index K is in preset range.
Wherein, polytropic index K is preset0It can be preset according to the actual situation with preset threshold M.Specifically, for every
A compressor has specific polytropic index, can be using this specific polytropic index as default polytropic index K0.It is default
Polytropic index K0It can be and provided by compressor manufacturer, test measurement can also be carried out by air conditioner manufacturer and obtained.Preset threshold M can
Tolerance value with the polytropic index provided for compressor manufacturer, or the multi-party finger that air conditioner manufacturer test measurement obtains
The deviation of several permissions can also be the value between 5%~10%, be not specifically limited herein.
Specifically, after the polytropic index K that control module 40 receives the compressor that computing module 30 is sent, judge whether full
Foot (K-K0)/K0≤ M judges that compressor has back liquid risk if so, illustrating that compressor returns liquid or approaches back liquid.
It should be noted that polytropic index K only exists small for the compressor of same refrigerant and same model
Deviation, generally a fixed value.For in Hitachi's E405DHD compressor, if its refrigerant is R410A, by a large amount of
Test it can be concluded that, the polytropic index K of this compressor is generally fluctuated between 1.18~1.20.In air conditioner operational process
In, may be as caused by following two situation if polytropic index K deviates from this range: 1, compressor be protected
Warm deficiency causes leakage heat excessive；2 compressors flow back to the refrigerant abnormal state of port, there is non-fully gaseous ingredient, that is, compress
Machine returns liquid.Situation 1 is very rare, and caused by polytropic index K deviation range very little, if polytropic index K deviate range compared with
It is more, then it is likely to as caused by situation 2, it can judge that compressor has back liquid risk.It follows that according to polytropic index
K may determine that compressor whether there is back liquid risk.
According to one embodiment of present invention, control module 40 is also used to: right after judging that compressor has back liquid risk
The operating status of air conditioner is adjusted, so that (K-K0)/K0Reach certain reasonable value, compressor is avoided to return liquid, improves system
Reliability of operation.
Specifically, it if it is determined that compressor has back liquid, then can be opened by the frequency of compressor, each valve body of outdoor unit
The operating status of air conditioner is adjusted in pass, switch, the rotation speed of fan of each valve body of indoor unit etc., so that (K-K0)/K0Reach one
Fixed reasonable value, this reasonable value can be set to be greater than preset threshold M, return liquid to avoid compressor, and what the system that improves was run can
By property.
In conclusion compressor according to an embodiment of the present invention returns liquid judgment means, is obtained and pressed by temperature acquisition module
The suction temperature and delivery temperature of contracting machine, and by the back pressure and pressure at expulsion of pressure acquisition module acquisition compressor, then
The multi-party of compressor is calculated according to the suction temperature of compressor, delivery temperature, back pressure and pressure at expulsion by computing module
Index finally, control module judges that compressor whether there is back liquid risk according to polytropic index, and is judging that compressor exists back
When liquid risk, the operating status of air conditioner is adjusted, so that the polytropic index of compressor reaches certain reasonable value, is avoided
Compressor returns liquid.The device accurately can judge whether compressor occurs back liquid as a result, improve air conditioner operation can
By property.
In addition, the embodiment of the present invention also proposes a kind of air conditioner comprising the compressor of above-mentioned air conditioner returns liquid judgement
Device.
The air conditioner of the embodiment of the present invention obtains mould by the temperature that the compressor of above-mentioned air conditioner returns liquid judgment means
Block obtains the suction temperature and delivery temperature of compressor, and back pressure and the exhaust of compressor are obtained by pressure acquisition module
Then pressure is calculated according to the suction temperature of compressor, delivery temperature, back pressure and pressure at expulsion by computing module and is pressed
The polytropic index of contracting machine, finally, judging that compressor whether there is back liquid risk according to polytropic index by control module.As a result,
Improve air conditioner reliability of operation.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (7)
1. a kind of compressor of air conditioner returns liquid judgment method, which comprises the following steps:
Obtain suction temperature, delivery temperature, back pressure and the pressure at expulsion of the compressor；
The multi-party of the compressor is calculated according to the suction temperature of the compressor, delivery temperature, back pressure and pressure at expulsion
Index；
Judge that the compressor whether there is back liquid risk according to the polytropic index；
Wherein, judge that the compressor whether there is back liquid risk according to the polytropic index, comprising:
Calculate the difference between the polytropic index and default polytropic index；
Judge whether the difference and the ratio of the default polytropic index are less than or equal to preset threshold；
If the ratio is less than or equal to the preset threshold, judge that the polytropic index is in the preset range；
If the polytropic index is in the preset range, judge that the compressor has back liquid risk.
2. the compressor of air conditioner as described in claim 1 returns liquid judgment method, which is characterized in that be calculated by the following formula
The polytropic index of the compressor:
T2/T1=(P2/P1)(K-1)/K,
Wherein, K is the polytropic index of the compressor, and T1 is the suction temperature of the compressor, and T2 is the row of the compressor
Temperature degree, P1 are the back pressure of the compressor, and P2 is the pressure at expulsion of the compressor.
3. the compressor of air conditioner as described in claim 1 returns liquid judgment method, which is characterized in that judging the compressor
There are after described time liquid risk, also the operating status of the air conditioner is adjusted.
4. a kind of compressor of air conditioner returns liquid judgment means characterized by comprising
Temperature acquisition module, for obtaining the suction temperature and delivery temperature of the compressor；
Pressure acquisition module, for obtaining the back pressure and pressure at expulsion of the compressor；
Computing module, the computing module are connected with the temperature acquisition module and the pressure acquisition module respectively, are used for root
The polytropic index of the compressor is calculated according to the suction temperature of the compressor, delivery temperature, back pressure and pressure at expulsion；
Control module, the control module are connected with the computing module, for judging the compression according to the polytropic index
Machine whether there is back liquid risk；
When the control module judges that the compressor whether there is back liquid risk according to the polytropic index, wherein
The control module calculates the difference between the polytropic index and default polytropic index；
The control module judges whether the difference and the ratio of the default polytropic index are less than or equal to preset threshold；
If the ratio is less than or equal to the preset threshold, control module if, judges that the polytropic index is in described pre-
If range；
If the polytropic index is in the preset range, control module if, judges that the compressor has back liquid wind
Danger.
5. the compressor of air conditioner as claimed in claim 4 returns liquid judgment means, which is characterized in that the computing module passes through
Following formula calculates the polytropic index of the compressor:
T2/T1=(P2/P1)(K-1)/K,
Wherein, K is the polytropic index of the compressor, and T1 is the suction temperature of the compressor, and T2 is the row of the compressor
Temperature degree, P1 are the back pressure of the compressor, and P2 is the pressure at expulsion of the compressor.
6. the compressor of air conditioner as claimed in claim 5 returns liquid judgment means, which is characterized in that the control module is also used
In: after judging that the compressor has described time liquid risk, the operating status of the air conditioner is adjusted.
7. a kind of air conditioner, which is characterized in that the compressor including the air conditioner as described in any one of claim 4-6 returns liquid
Judgment means.
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| CN111829173A (en) * | 2019-04-23 | 2020-10-27 | 杭州先途电子有限公司 | Control method and system and air source heat pump air heater |
| CN110131856B (en) * | 2019-05-20 | 2021-07-20 | 广东美的制冷设备有限公司 | Air conditioner and control method thereof |
| CN112984881B (en) * | 2021-03-05 | 2023-03-24 | 四川长虹空调有限公司 | Liquid return judgment method and system for compressor of refrigeration system |
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