CN109654008A - Air compressor dynamic test interval determines method - Google Patents
Air compressor dynamic test interval determines method Download PDFInfo
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- CN109654008A CN109654008A CN201910126725.8A CN201910126725A CN109654008A CN 109654008 A CN109654008 A CN 109654008A CN 201910126725 A CN201910126725 A CN 201910126725A CN 109654008 A CN109654008 A CN 109654008A
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- air compressor
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- expulsion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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Abstract
The embodiment of the present application discloses a kind of air compressor pressure at expulsion dynamic detection interval and determines method, it can establish the random process model for meeting air compressor pressure at expulsion variation characteristic according to historical data, determine the first inspection phase of air compressor, it can judge whether air compressor needs to carry out preventative maintenance according to current exhaust pressure detected value simultaneously, if without preventative maintenance, air compressor test interval next time can be then determined according to current exhaust pressure detected value, so that user be assisted to carry out dynamic maintenance decision.
Description
Technical field
Maintenance (CBM) the invention relates to air compressor, based on state and the dimension centered on reliability
Repair the field (RCM), and in particular to air compressor dynamic test interval determines method.
Background technique
Air compressor is a kind of device of compressed air, is capable of providing gas source power, is the core equipment of pneumatic system,
Main body in electromechanical bleed source device, it is that the mechanical energy of former dynamic (usually motor or diesel engine) is converted into gas pressure
The device of energy, is the pressure generator of compressed air, is widely used in conventional air power device, vehicle braking, weapon dress
The fields such as standby, aero-engine.
Air compressor is directly driven when working by motor, and crankshaft is made to generate rotary motion, and connecting rod is driven to produce piston
It is raw to move back and forth, cause volume of cylinder to change.Due to the variation of inner pressure of air cylinder, air-filtering is passed air through by intake valve
Device (silencer) enters cylinder, and in compression travel, due to the diminution of volume of cylinder, compressed air passes through the effect of exhaust valve,
Through exhaust pipe, check valve (check-valves) enters air accumulator, is controlled and oneself when pressure at expulsion reaches rated pressure by pressure switch
It is dynamic to shut down.When reservoir pressure is down to specified pressure of inspiration(Pi), pressure switch couples starting automatically.
Air compressor air-tightness is particularly significant.When there is gas leakage, one lateral pressure of compressor inner pump is not achieved
Rated pressure will lead to the reduction of compressor compresses efficiency and extraction flow, increase the working time of compressor, when causing work
Between increase and the energy waste.In order to avoid this kind of situation, the pressure in air compressor can be monitored.When
When pressure value is reduced to specific preventative maintenance threshold value, air compressor needs to carry out preventative maintenance.The threshold value is to sentence
Whether disconnected air compressor machine carries out the criterion of preventative maintenance, generally according to product during equipment development safety grades come to
It is fixed.Air compressor needs to carry out preventative maintenance.Preventative maintenance is maintenance completely, and air compressor machine is restored to initially after maintenance
State；In view of test interval cannot be too short under actual conditions, therefore when pressure detection value is less than preventative maintenance threshold
When the specified threshold of value, that is, need to carry out preventative maintenance to air compressor, if pressure detection value does not reach thresholding
Value, then air compressor machine carries out minimal maintenance, and failure rate remains unchanged.Threshold value is determined by air compressor minimum detection time interval
It is fixed.
The pressure at expulsion of air compressor is regarded as the degeneration with sealing element and gradually decreases.At present to air pressure
The monitoring of the pressure at expulsion of contracting machine is usually by the way of traditional periodic detection, and this mode management work is simple, but needle
Poor to property, larger workload is uneconomical.Therefore the present invention is established by the way of based on State Maintenance according to historical data
The random process model for meeting the pressure at expulsion change procedure of air compressor determines the first inspection phase of air compressor, while energy
Enough exhaust pressure values based on present air compressor determine compressor test interval next time.It meanwhile when detecting, can be with
Judge whether air compressor needs to carry out preventative maintenance according to current detection result, assists user of service to repair with this
Decision.
Summary of the invention
The purpose of the embodiment of the present application is to propose a kind of air compressor pressure at expulsion dynamic detection interval determination side
Method determines the Modeling Calculation method of test interval next time based on the currently monitored pressure value arrived.
In a first aspect, the embodiment of the present application provides a kind of air compressor pressure at expulsion dynamic detection interval determination side
Method, comprising:
Step 1 collects and handles the pressure at expulsion detection data sequence in the air compressor course of work, according to safety
Or task requirement, determine air compressor preventative maintenance threshold value DPM；
Step 2, according in step 1 gained air compressor pressure at expulsion detection data by air compressor pressure at expulsion with
The trend of time change learns least square method according to statistics and is fitted to process with independent increments；
Step 3, analysis air compressor pressure at expulsion and compressor normal operating conditions, detecting state and preventative maintenance
Corresponding relationship between state determines pressure at expulsion preventative maintenance threshold value DPMIt is closed with the function of compressor test interval mean value
System, establishes the gamma process model of air compressor pressure at expulsion；
Step 4, the mean value that the air compressor head inspection phase is calculated according to the gamma process model of foundation, calculate air compressor
First inspection phase T0；
Step 5 calculates air compressor pressure at expulsion from current detection value to preventative maintenance threshold value DPMTime average,
Calculate air compressor test interval next time；
Step 6, according to preset air compressor test interval minimum value TminCalculate the preventative dimension of air compressor
Repair threshold valueBy present air Compressor Discharge Pressure detected value and preventative maintenance threshold valueIt compares, if working as
Preceding air compressor pressure at expulsion detected value is more than threshold value, then air compressor carries out preventative maintenance.
In some embodiments, method further include: if present air Compressor Discharge Pressure detected value is less than threshold value,
Then air compressor carries out minimal maintenance, detection is then proceeded by, until detected value reaches threshold value
In some embodiments, in the pressure at expulsion detection data sequence in the air compressor course of work, pressure at expulsion
Monitoring data include air compressor pressure at expulsion testing result and detection time, air compressor preventative maintenance threshold value DPMWith
And air compressor test interval minimum value Tmin, wherein preventative maintenance threshold value DPMIt is wanted by air compressor machine safety or task
Ask determining.
In some embodiments, it in step 2, is determined according to least square method by air compressor pressure at expulsion change procedure
It is fitted to gamma process with independent increments.
In some embodiments, the air compressor head inspection phase is reduced to preventative maintenance threshold from rated pressure for pressure at expulsion
Value DPMElapsed time mean value E (T0)。
In some embodiments, air compressor test interval is to reduce from air compressor pressure at expulsion testing result
To preventative maintenance threshold value DPMElapsed time mean value E (Ti)。
Air compressor dynamic test interval provided by the embodiments of the present application determines method, can be built according to historical data
The vertical random process model for meeting air compressor pressure at expulsion variation characteristic, determines the first inspection phase of air compressor, while energy
It is enough to judge whether air compressor needs to carry out preventative maintenance according to current exhaust pressure detected value；If without preventative dimension
It repairs, then can determine air compressor test interval next time, ancillary equipment working service according to current exhaust pressure detected value
Personnel carry out dynamic maintenance decision.It saves equipment and uses unit correlation fixed assets working service cost.The embodiment of the present application mentions
The scheme of confession has good applicability, suitable for all air compressor products with this degenerative character.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
The air compressor dynamic test interval that Fig. 1 schematically shows the application determines the flow chart of method；
Fig. 2 schematically shows in embodiment shown in FIG. 1, the difference of air compressor pressure at expulsion and rated pressure
The procedure chart changed over time；
Fig. 3 is schematically shown in present case, and the difference of air compressor pressure at expulsion and rated pressure becomes at any time
The procedure chart of change；
Fig. 4 schematically shows in present case, test interval is with air compressor current exhaust pressure and specified pressure
The curve of the difference variation of power.
Symbol description in Wen Zhongyu figure
DPMIndicate air compressor pressure at expulsion preventative maintenance threshold value；
Indicate that air compressor pressure at expulsion need to carry out the testing result threshold value of preventative maintenance；
T0Indicate that air compressor detects interval time for the first time；
TtIndicate air compressor detection time；
TmIndicate air compressor preventive maintenance time；
TminIndicate air compressor test interval minimum value；
Ti(i=1,2 ...) indicates that air compressor detects interval time；
Ri(i=0,1,2 ...) indicates that air compressor detects the preceding moment；
Moment after expression air compressor detection；
N indicates that air compressor detects number；
The difference of X (t) expression t moment air compressor pressure at expulsion and rated pressure；
xiThe detected value of (i=1,2 ...) expression i-th air compressor pressure at expulsion and rated pressure difference；
E(T0) indicate air compressor expectation detection time for the first time, i.e., first inspection phase；
E(Ti) (i=1,2 ...) expression air compressor expectation detection interval time, i.e. test interval；
η indicates the form parameter of air compressor pressure at expulsion variation gamma process；
ξ indicates the scale parameter of air compressor pressure at expulsion variation gamma process.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, part relevant to related invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
It is shown in Figure 1, method is determined for the product dynamic detection interval with typical degradation feature of the application
Flow chart.
The method of the present embodiment includes:
Step 1, as shown in figure 1 shown in appended drawing reference 101, collect and handle the pressure at expulsion in the air compressor course of work
Detection data.
The product-related data collected clearly is needed first, including when air compressor pressure at expulsion testing result and detection
Between, air compressor preventative maintenance threshold value DPMAnd test interval minimum value Tmin.Wherein preventative maintenance threshold value DPMBy
Air compressor machine safety or task require to determine, when air compressor machine pressure at expulsion is more than preventative maintenance threshold value DPMWhen, that is, need into
Otherwise row preventative maintenance will affect the normal job tasks of air compressor machine；Test interval minimum value TminIt is passed through by pneumatics machine testing
Ji property determine, when test interval be less than the minimum value when, continue detect activity cost it is excessively high uneconomical, i.e., directly progress
Preventative maintenance.Design data collects table.
Calculate and record the difference DELTA of detection interval of delta t and the air compressor pressure at expulsion and rated pressure that are collected into
X (t), using the difference as target component.
Step 2, as shown in figure 1 shown in appended drawing reference 102, according to the data obtained in step 1 by air compressor pressure at expulsion
Process with independent increments is fitted to the propagation process of rated pressure difference.According to the feature of the data obtained, gamma process can be used
It is fitted, that is, the air compressor pressure at expulsion being collected into and rated pressure difference i-th testing result xiObey form parameter
For η, scale parameter is the gamma process of ξ, and parameter can be estimated by Maximum Likelihood Estimation Method.
Pressure difference value increment probability density are as follows:
WhereinU is the intermediate variable for assisting integral calculation, and e is natural constant.
Then there is maximum likelihood function:
Logarithm is taken to maximum likelihood function both ends, is obtained:
So as to obtain likelihood equations:
Wherein
The maximum likelihood estimation of parameter η and ξ can be obtained by solving the likelihood equations.
Step 3, as shown in figure 1 shown in appended drawing reference 103, pair between air compressor pressure at expulsion and working condition is analyzed
It should be related to, determine that the function of pressure at expulsion preventative maintenance threshold value and threshold value and air compressor test interval mean value closes
System establishes the air compressor pressure at expulsion random process model for considering detection with maintenance.When pressure at expulsion is not up to preventative
When repairing threshold value, air compressor machine is in normal operating conditions；When pressure at expulsion reaches preventative maintenance threshold value, air compressor machine enters pre-
Anti- property service mode.Air compressor pressure at expulsion and the process schematic that rated pressure difference changes over time are as shown in Figure 2.
Horizontal axis is time t in Fig. 2, and the longitudinal axis is the difference X (t) of air compressor pressure at expulsion and rated pressure.Assuming that should
The process that difference changes over time obeys gamma process, then it is η Δ t, scale parameter that difference increment Delta X (t), which obeys form parameter,
It is distributed for the gamma of ξ, probability density function is as follows:
DPMFor air compressor preventative maintenance threshold value, Ti(i=0,1,2 ...) is air compressor i-th detection and i-th
Interval time between+1 detection, TtFor air compressor detection time, TmFor air compressor preventive maintenance time.Air
The difference of Compressor Discharge Pressure and rated pressure is 0 in the initial state, and the difference gradually increases as time increases.?
By first time inspection phase T0After reach time point R0When, air compressor is detected for the first time.
As shown in Figure 2, there are two types of possible for two different change curves expression testing results: dotted line indicates air compression
Machine pressure at expulsion testing result has reached preventative maintenance threshold value DPM, air compressor will directly carry out preventative maintenance at this time；
Solid line indicates that air compressor pressure at expulsion testing result does not reach threshold valueAir compressor is not processed at this time,
Keep work on hand state from time pointIt works on.Similarly, in time point R1Second of testing result does not reach exhaust
Threshold pressureWhen, keep work on hand state from time pointIt works on.When testing result reaches pressure at expulsion door
Limit valueWhen, such as time point R2Shown in respective value, air compressor is no longer detected next time, directly carries out preventative dimension
It repairs.Time point in such as figureShown in respective value, air compressor is repaired completely, i.e. air compressor pressure at expulsion and volume
The difference of constant-pressure is retracted into zero,
Step 4, as shown in figure 1 shown in appended drawing reference 104, according to the random process model of foundation to air compressor exhaust pressure
The difference of power and rated pressure is from zero to preventative maintenance threshold value DPMProcess average, calculate air compressor head examine the phase.By
It is η Δ t that the process that the difference known to Fig. 2 increases at any time, which obeys form parameter, and scale parameter is the gamma process of ξ, i.e. increment
The probability density function of Δ X (t) is as follows:
According to the definition provided it is found that the air compressor head inspection phase reaches for the difference of pressure at expulsion and rated pressure from zero
Preventative maintenance threshold value DPMElapsed time mean value, i.e. E (T0).Therefore the air compressor head inspection phase is that the gamma process reaches
To preventative maintenance threshold value DPMFirst-arrival time.Then there is first inspection phase distribution function:
Wherein incomplete gamma functions Γ [x, t] is given by the following formula:
Then first inspection phase probability density function are as follows:
Therefore first inspection phase expectation can be acquired by following formula:
Wherein
Step 5, as shown in figure 1 shown in appended drawing reference 105, according to the random process model of foundation to air compressor exhaust pressure
The difference of power and rated pressure is from current detection value to preventative maintenance threshold value DPMProcess average, be based on the difference i-th
Detected value xiCalculate test interval T next timei+1.As shown in Figure 2, the time T of i+1 intervali+1Distribution are as follows:
Therefore
It thus can be based on air compressor pressure at expulsion and rated pressure difference current detection value xiCalculating detects next time
Interval Ti+1。
Step 6, as shown in figure 1 shown in appended drawing reference 106, according to test interval minimum value TminDetermine air compressor machine threshold value
Then there is formula:
Wherein
Solve the x in formulaiValue is air compressor machine threshold value
Pressure at expulsion difference testing result X (t) and threshold valueComparison can be used as air compressor whether carry out it is pre-
The criterion of anti-property maintenance.When testing result X (t) is more than or equal to threshold valueWhen, air compressor carries out preventative maintenance,
Otherwise continue to detect according to the above required test interval, until testing result reaches threshold value
Below with reference to example, specific embodiments of the present invention will be described in further detail.
It is certain the air compressor pressure at expulsion detection data being collected into following table.
Certain the air compressor pressure at expulsion detection data of table 1
| Time/× 103h | Pressure at expulsion/MPa | Time/× 103h | Pressure at expulsion/MPa |
| 0 | 20 | 6 | 14.55 |
| 1 | 18.85 | 7 | 13.29 |
| 2 | 17.48 | 8 | 12.78 |
| 3 | 16.06 | 9 | 11.79 |
| 4 | 15.21 | 10 | 10.72 |
| 5 | 14.98 |
Step 1, the increment of air compressor pressure at expulsion and rated pressure difference is calculated according to the data that upper table is collected into,
It is as shown in the table:
The incremental data of table 2 certain air compressor pressure at expulsion and rated pressure difference
| Serial number | 1 | 2 | 3 | 4 | 5 |
| Increment/MPa | 1.15 | 1.37 | 1.42 | 0.85 | 0.23 |
| Serial number | 6 | 7 | 8 | 9 | 10 |
| Increment/MPa | 0.43 | 1.27 | 0.51 | 0.98 | 1.07 |
Air compressor preventative maintenance threshold value D is determined according to security requirementPMFor 10MPa, test interval minimum value
TminFor 500h.
Step 2, the incremental data according to certain air compressor machine pressure at expulsion collected in step 1 and rated pressure difference is special
Property, it can be fitted with gamma process, then having pressure difference value increment Delta X (t) to obey form parameter is η, and scale parameter is the gamma of ξ
Distribution, probability density function are as follows:
The method that Maximum-likelihood estimation can be used estimates the form parameter η and scale parameter ξ of gamma distribution.
Parameter maximum likelihood estimation η=3.99, ξ=0.23 in this example.
Step 3, the relationship between air compressor pressure at expulsion and working condition is analyzed, random process model is established.
The difference of air compressor pressure at expulsion and rated pressure increases with the increase of working time, which meets gal
Horse process.Initial difference is 0MPa, and difference preventative maintenance threshold value is 10MPa.
Increased at any time according to the difference that above data can draw air compressor machine pressure at expulsion and rated pressure as shown in Figure 3
Process schematic.
Step 4, it calculates air compressor head and examines the phase.Air compressor pressure at expulsion and rated pressure known to above step
Difference increase process and meet form parameter η=3.99, the gamma process of scale parameter ξ=0.23, then air compressor head is examined
Phase is the process from initial value 0MPa to preventative maintenance threshold value 10MPa elapsed time mean value, it may be assumed that
Can be calculated the air compressor head inspection phase is E (T0)=10.125 × 103h。
Step 5, according to the difference current value x of air compressor pressure at expulsion and rated pressureiIt calculates detect next time between
Every phase Ti+1.By above step it is found that the time T of i+1 intervali+1Distribution are as follows:
Therefore
The following table 3 show air compressor test interval calculated result.
Certain the air compressor dynamic test interval calculated result of table 3
| Pressure difference value/MPa | Test interval/103h | Pressure difference value/MPa | Test interval/103h |
| 0 | 10.125 | 6 | 4.125 |
| 1 | 9.125 | 7 | 3.125 |
| 2 | 8.125 | 8 | 2.125 |
| 3 | 7.125 | 9 | 1.125 |
| 4 | 6.125 | 10 | 0 |
| 5 | 5.125 |
It is illustrated in figure 4 the song that test interval changes with the difference of air compressor current exhaust pressure and rated pressure
Line.Test interval next time can be determined based on air compressor current exhaust pressure by the curve.
Step 6, according to test interval minimum value TminDetermine air compressor machine threshold value
Formula can be obtained:
Solve threshold valueFor 9.6MPa.I.e. when pressure difference value result is greater than 9.6MPa, air compressor carries out pre-
Anti- property maintenance.
Air compressor dynamic test interval provided by the embodiments of the present application determines method, can be built according to historical data
The vertical random process model for meeting air compressor pressure at expulsion variation characteristic, determines the first inspection phase of air compressor, while energy
It is enough to judge whether air compressor needs to carry out preventative maintenance according to current exhaust pressure detected value；If without preventative dimension
It repairs, then can determine air compressor test interval next time, ancillary equipment working service according to current exhaust pressure detected value
Personnel carry out dynamic maintenance decision.It saves equipment and uses unit correlation fixed assets working service cost.The embodiment of the present application mentions
The scheme of confession has good applicability, suitable for all air compressor products with this degenerative character.
Claims (6)
1. a kind of air compressor pressure at expulsion dynamic detection interval determines method characterized by comprising
The pressure at expulsion detection data sequence in the air compressor course of work is collected and handled to step 1, according to safety or appoints
Business property requires, and determines air compressor preventative maintenance threshold value DPM；
Step 2, according in step 1 gained air compressor pressure at expulsion detection data by air compressor pressure at expulsion at any time
The trend of variation learns least square method according to statistics and is fitted to process with independent increments；
Step 3, analysis air compressor pressure at expulsion and compressor normal operating conditions, detecting state and preventative maintenance state
Between corresponding relationship, determine pressure at expulsion preventative maintenance threshold value DPMWith the functional relation of compressor test interval mean value,
Establish the gamma process model of air compressor pressure at expulsion；
Step 4, the mean value that the air compressor head inspection phase is calculated according to the gamma process model of foundation, calculate air compressor head inspection
Phase T0；
Step 5 calculates air compressor pressure at expulsion from current detection value to preventative maintenance threshold value DPMTime average, calculate
Air compressor test interval next time；
Step 6, according to preset air compressor test interval minimum value TminCalculate the preventative dimension of the air compressor
Repair threshold valueBy present air Compressor Discharge Pressure detected value and the preventative maintenance threshold valueIt compares,
If the present air Compressor Discharge Pressure detected value is more than threshold value, the air compressor carries out preventative maintenance.
2. the method according to claim 1, wherein the method also includes:
If the present air Compressor Discharge Pressure detected value is less than the threshold value, air compressor carries out minimum dimension
It repairs, then proceeds by detection, until detected value reaches threshold value
3. method according to claim 1 or 2, which is characterized in that the pressure at expulsion inspection in the air compressor course of work
In measured data sequence, pressure at expulsion monitoring data include air compressor pressure at expulsion testing result and detection time, air pressure
Contracting machine preventative maintenance threshold value DPMAnd air compressor test interval minimum value Tmin, wherein the preventative maintenance threshold value
DPMIt requires to determine by air compressor machine safety or task.
4. method according to claim 1 or 2, which is characterized in that in the step 2, being determined according to least square method will
Air compressor pressure at expulsion change procedure is fitted to gamma process with independent increments.
5. method according to claim 1 or 2, which is characterized in that the air compressor head inspection phase be pressure at expulsion from
Rated pressure is reduced to preventative maintenance threshold value DPMElapsed time mean value E (T0)。
6. method according to claim 1 or 2, which is characterized in that the air compressor test interval is from air
Compressor Discharge Pressure testing result is reduced to preventative maintenance threshold value DPMElapsed time mean value E (Ti)。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799359A (en) * | 2010-01-27 | 2010-08-11 | 北京信息科技大学 | Failure monitoring and predicting method and system of power equipment |
| BE1018998A3 (en) * | 2009-11-10 | 2011-12-06 | Atlas Copco Airpower Nv | METHOD FOR MONITORING THE STATE OF VALVES OF A PISTON COMPRESSOR. |
| CN104268678A (en) * | 2014-09-15 | 2015-01-07 | 中国石油化工股份有限公司武汉分公司 | Preventative device maintenance method based on dynamic reliability |
| CN106679066A (en) * | 2016-11-17 | 2017-05-17 | 珠海格力电器股份有限公司 | Unit fault judgment method and device |
| CN109340096A (en) * | 2018-10-25 | 2019-02-15 | 科希曼电器有限公司 | A kind of compressor fault monitoring method and its monitoring device |
-
2019
- 2019-02-20 CN CN201910126725.8A patent/CN109654008B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1018998A3 (en) * | 2009-11-10 | 2011-12-06 | Atlas Copco Airpower Nv | METHOD FOR MONITORING THE STATE OF VALVES OF A PISTON COMPRESSOR. |
| CN101799359A (en) * | 2010-01-27 | 2010-08-11 | 北京信息科技大学 | Failure monitoring and predicting method and system of power equipment |
| CN104268678A (en) * | 2014-09-15 | 2015-01-07 | 中国石油化工股份有限公司武汉分公司 | Preventative device maintenance method based on dynamic reliability |
| CN106679066A (en) * | 2016-11-17 | 2017-05-17 | 珠海格力电器股份有限公司 | Unit fault judgment method and device |
| CN109340096A (en) * | 2018-10-25 | 2019-02-15 | 科希曼电器有限公司 | A kind of compressor fault monitoring method and its monitoring device |
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