CN109238762A - Automobile air compressor online testing device, system and method - Google Patents
Automobile air compressor online testing device, system and method Download PDFInfo
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- CN109238762A CN109238762A CN201811217420.XA CN201811217420A CN109238762A CN 109238762 A CN109238762 A CN 109238762A CN 201811217420 A CN201811217420 A CN 201811217420A CN 109238762 A CN109238762 A CN 109238762A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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Abstract
The invention discloses a kind of automobile air compressor online testing devices, it include: test cabinet, input equipment, industrial PC, PLC module group, intelligence instrument, miniature relay group, AC contact module group, permanent magnetic controller module group and acquisition sensor group, the input equipment, PLC module group, intelligence instrument and permanent magnetic controller module group pass through conducting wire and connect with industrial PC, the miniature relay group is connected by conducting wire and is connect with PLC module group, the AC contact module group is connect by conducting wire with miniature relay group, the acquisition sensor group is connect with PLC module group and intelligence instrument respectively by conducting wire, it is tested by air compressor machine of the permanent magnetic controller module group to magneto, by the way that technological parameter is arranged, the numerical value of detection parameters and detection parameters, air compressor machine parameter is tested comprehensively , achieve the purpose that multi-parameter is carried out to the air compressor machine of a variety of motor models to be tested comprehensively, improve the efficiency and parameter accuracy tested air compressor machine.
Description
Technical field
The present invention relates to air compressor machine the field of test technology, and in particular to a kind of automobile air compressor online testing device, system
And method.
Background technique
Although existing automobile air compressor on-line testing platform is able to carry out the detection of automobile air compressor, but have the disadvantage that
Since there are many models for example, asynchronous 220V, asynchronous 380V, permanent magnetism 220V and permanent magnetism 380V for the motor of air compressor machine,
And corresponding testboard product can only often test a kind of model, and existing test product is to permanent magnetism serial motors
Air compressor machine can only carry out simple operations, be unable to test the test etc. of the function such as volume flow of some complexity, air compressor machine caused to be surveyed
Test stand needs to purchase more and simultaneously increases input, and maintenance cost is high, is unable to complete to the permanent magnetism air compressor machine test that electric car uses
Test target.
Existing testboard product air compressor machine parameter when carrying out the test of different batches of product needs to manually enter, increase person
Work learning cost increases operation difficulty.
Existing testboard only has single result parameter output after completing test, needs to manually enter the equipment such as PC and is beaten
Print, can not automatically form complete test report.
Existing testboard product needs to carry out more dismounting wireline operations when testing the air compressor machine of different model,
Operating efficiency is lower.
Summary of the invention
In order to solve the above technical problems, the invention proposes a kind of automobile air compressor online testing device, system and method,
It tested comprehensively with reaching the air compressor machine progress multi-parameter to a variety of motor models, improve the efficiency and parameter standard tested air compressor machine
The purpose of true property.
In order to achieve the above objectives, technical scheme is as follows: a kind of automobile air compressor online testing device, the dress
Set includes: test cabinet, input equipment, industrial PC, PLC module group, intelligence instrument, miniature relay group, A.C. contactor mould
Block group, permanent magnetic controller module group and acquisition sensor group, the input equipment, industrial PC, PLC module group, intelligence instrument,
Miniature relay group, AC contact module group, permanent magnetic controller module group and acquisition sensor group are installed in test cabinet,
The input equipment, PLC module group, intelligence instrument and permanent magnetic controller module group pass through conducting wire and connect with industrial PC, institute
State miniature relay group and connected by conducting wire and is connect with PLC module group, the AC contact module group pass through conducting wire with it is small-sized
The connection of relay group, the acquisition sensor group are connect with PLC module group and intelligence instrument respectively by conducting wire；
The input equipment, for the industrial PC input technological parameter of air compressor machine, detection parameters and detection parameters
Numerical value；
The industrial PC, for handling the technological parameter of input and the data of acquisition sensor group acquisition；
The PLC module group, for judging the type and control miniature relay group of air compressor motor according to technological parameter
Work is also used to obtain the data of acquisition sensor group acquisition；
The intelligence instrument, for obtaining the data of acquisition sensor group acquisition；
The miniature relay group, for controlling the work of AC contact module group；
The AC contact module group, is tested for the air compressor machine to asynchronous machine；
The permanent magnetic controller module group, is tested for the air compressor machine to magneto；
The acquisition sensor group, for acquiring the test data of air compressor machine.
Further, the acquisition sensor group includes: that temperature sensor, pressure sensor, noise transducer, electric current are mutual
Sensor and voltage power measuring appliance, the temperature sensor, pressure sensor and noise transducer pass through conducting wire and PLC module group
Connection, the current transformer and voltage power measuring appliance are connect by conducting wire with intelligence instrument.
Further, alarm is installed in the test cabinet, the alarm is connect by conducting wire with industrial computer,
In test process, when the parameter value of real-time monitoring is beyond the parameter threshold of setting, alarm is automatically turned on, thus safeguards system and behaviour
Make the safety of personnel.
Further, printing device is installed, the printing device is connected by conducting wire and industrial computer in the test cabinet
It connects, printing device can automatically print test report, check for operator.
Further, cooling fan is installed, the cooling fan is connected by conducting wire and industrial computer in the test cabinet
Connect, test when the temperature is excessively high, start fan for cooling, ensure the safety of test macro.
A kind of automobile air compressor Online Transaction Processing, the system comprises: technological parameter setup module, detection parameters setting
Module, technological parameter management module, real-time parameter acquisition module, parameter processing control module, display module and memory module；Institute
Technological parameter setup module, detection parameters setup module and real-time parameter acquisition module is stated to connect with parameter processing control module
Connect, the technological parameter management module is connect with memory module, the parameter processing control module respectively with display module and deposit
Store up module connection；
Technological parameter is arranged into system for the type according to air compressor machine in the technological parameter setup module, and by work
Skill parameter is sent to parameter processing control module；
The detection parameters setup module, for the detection parameters of pneumatics machine testing and the numerical value of detection parameters to be arranged, and
The numerical value that will test parameter and detection parameters is sent to parameter processing control module；
The technological parameter management module, the technological parameter for being set in management system；
The real-time parameter acquisition module is sent for acquiring the parameter of air compressor machine test in real time, and by the parameter of acquisition
To parameter processing control module；
The parameter processing control module, for the parameter for the treatment of process parameter and acquisition, parameter for that will acquire with
The numerical value of detection parameters is compared, and is also used to generate air compressor machine test report and the device transmission control to detection air compressor machine refers to
It enables；
The display module, the air compressor machine test report generated for display parameters processing and control module；
The memory module is used for storage technology parameter and air compressor machine test report.
Further, the type of the air compressor machine include: 220V asynchronous machine air compressor machine, 380V asynchronous machine air compressor machine,
220V magneto air compressor machine and 380V magneto air compressor machine.
Further, the technological parameter includes: device model, outlet temperature, air accumulator temperature, volume flow, outlet
Pressure, reservoir pressure, pressure at expulsion, runing time, voltage, electric current, power, power factor (PF), maximum pressure and output mode.
Further, the detection parameters include: environment temperature, outlet temperature, air accumulator temperature, volume flow, outlet
Pressure, reservoir pressure, noise decibel, runing time, voltage, total current, apparent energy, power factor (PF), A phase current, B phase electricity
Stream and C phase current；The numerical value of the detection parameters include: temperature, air pressure, voltage and current numberical range.
A kind of automobile air compressor on-line testing method, the method step include: that operator is artificial according to air compressor machine type
Or by ERP system into air compressor machine test macro typing technological parameter, detection parameters and detection parameters numerical value；Air compressor machine is surveyed
Test system judges automatically air compressor machine classification, and sends control instruction to air compressor machine to pneumatics apparatus test device by Modbus RTU
It is tested；The test data for acquiring air compressor machine in real time by acquiring sensor group is compared with the numerical value of detection parameters；Such as
Fruit data be abnormal then to pneumatics apparatus test device send alarm command carry out early warning, if data normally if generate air compressor machine
Examining report.
The present invention has the advantage that
(1) the present invention can be to magneto by the way that permanent magnetic controller module group is arranged in pneumatics apparatus test device
Air compressor machine is tested, and the type of air compressor machine can be tested by increasing test device, makes test that can test a variety of motor models
Air compressor machine.
(2) the present invention, can be to air compressor machine parameter by setting technological parameter, the numerical value of detection parameters and detection parameters
It is tested comprehensively, generates air compressor machine examining report, improve the efficiency and parameter accuracy tested air compressor machine.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.
Fig. 1 is automobile air compressor online testing device structural schematic diagram disclosed by the embodiments of the present invention；
Fig. 2 is that automobile air compressor online testing device component disclosed by the embodiments of the present invention is electrically connected schematic diagram；
Fig. 3 is automobile air compressor Online Transaction Processing module map disclosed by the embodiments of the present invention；
Fig. 4 is that automobile air compressor Online Transaction Processing data disclosed by the embodiments of the present invention send schematic diagram；
Fig. 5 is automobile air compressor Online Transaction Processing Data Detection schematic diagram disclosed by the embodiments of the present invention；
Fig. 6 is that automobile air compressor Online Transaction Processing data disclosed by the embodiments of the present invention store schematic diagram；
Number and corresponding component title represented by letter in figure:
1, test cabinet；2, input equipment；3, industrial PC；4, PLC module group；5, intelligence instrument；6, miniature relay group；
7, AC contact module group；8, permanent magnetic controller module group；9, sensor group is acquired；10, alarm；11, printing device；
12, cooling fan；13, three-phase power transformer；14, transformer is controlled；15, drawer.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.
The present invention provides a kind of automobile air compressor online testing devices, system and method, its working principle is that by
Setting permanent magnetic controller module group can test the air compressor machine of magneto in pneumatics apparatus test device, by the way that work is arranged
The numerical value of skill parameter, detection parameters and detection parameters tests air compressor machine parameter comprehensively, to reach to a variety of motor models
Air compressor machine carry out multi-parameter and test comprehensively, improve the purpose of the efficiency and parameter accuracy tested air compressor machine.
Below with reference to embodiment and specific embodiment, the present invention is described in further detail.
As depicted in figs. 1 and 2, a kind of automobile air compressor online testing device, described device include: test cabinet 1, input set
Standby 2, industrial PC 3, PLC module group 4, intelligence instrument 5, miniature relay group 6, AC contact module group 7, permanent magnetic controller
Module group 8 and acquisition sensor group 9, the input equipment 2, industrial PC 3, PLC module group 4, intelligence instrument 5, small-sized relay
Device group 6, AC contact module group 7, permanent magnetic controller module group 8 and acquisition sensor group 9 are installed in test cabinet 1, institute
Input equipment 2, PLC module group 4, intelligence instrument 5 and permanent magnetic controller module group 8 is stated to connect by conducting wire with industrial PC 3,
The miniature relay group 6 is connected by conducting wire and connect with PLC module group 4, the AC contact module group 7 pass through conducting wire and
Miniature relay group 6 connects, and the acquisition sensor group 9 is connect with PLC module group 4 and intelligence instrument 5 respectively by conducting wire；
The input equipment 2, for inputting technological parameter, detection parameters and the detection parameters of air compressor machine to industrial PC 3
Numerical value；
The industrial PC 3, the data that technological parameter and acquisition sensor group 9 for handling input acquire；
The PLC module group 4, for judging the type and control miniature relay group of air compressor motor according to technological parameter
6 work are also used to obtain the data that acquisition sensor group 9 acquires；
The intelligence instrument 5, the data acquired for obtaining acquisition sensor group 9；
The miniature relay group 6 works for controlling AC contact module group 7；
The AC contact module group 7, is tested for the air compressor machine to asynchronous machine；
The permanent magnetic controller module group 8, is tested for the air compressor machine to magneto；
The acquisition sensor group 9, for acquiring the test data of air compressor machine.
Wherein, input equipment 2 includes keyboard, mouse etc., and the input equipment 2 is placed in the drawer 15 of test cabinet 1.
Wherein, the acquisition sensor group 9 includes: temperature sensor, pressure sensor, noise transducer, Current Mutual Inductance
Device and voltage power measuring appliance, the temperature sensor, pressure sensor and noise transducer pass through conducting wire and PLC module group 4
Connection, the current transformer and voltage power measuring appliance are connect by conducting wire with intelligence instrument 5.
Wherein, alarm 10 is installed in the test cabinet 1, the alarm 10 is connect by conducting wire with industrial computer,
During the test, the parameter value of real-time monitoring beyond setting parameter threshold when, automatically turn on alarm, thus safeguards system and
The safety of operator, alarm 10 are three color combined aural and visual alarms 10, can choose acousto-optic state and only light status.
Wherein, printing device 11 is installed, the printing device 11 is connected by conducting wire and industrial computer in the test cabinet 1
It connects, printing device 11 can automatically print test report, check for operator.
Wherein, cooling fan 12 is installed, the cooling fan 12 is connected by conducting wire and industrial computer in the test cabinet 1
Connect, test when the temperature is excessively high, start fan for cooling, ensure the safety of test macro.
Wherein, automobile air compressor online testing device access three phase mains is powered for it, is provided with three-phase electricity in test cabinet 1
Power transformer 13 and control transformer 14, Switching Power Supply and air switch are additionally provided in test cabinet 1, Switching Power Supply is for opening
Test device, air switch are used for protection tester current overload.
Wherein, it is provided with exhaust valve and drain valve in test device, it can be with manual exhaust and draining in test.
A kind of automobile air compressor Online Transaction Processing, the system comprises: technological parameter setup module, detection parameters setting
Module, technological parameter management module, real-time parameter acquisition module, parameter processing control module, display module and memory module；Institute
Technological parameter setup module, detection parameters setup module and real-time parameter acquisition module is stated to connect with parameter processing control module
Connect, the technological parameter management module is connect with memory module, the parameter processing control module respectively with display module and deposit
Store up module connection；
Technological parameter is arranged into system for the type according to air compressor machine in the technological parameter setup module, and by work
Skill parameter is sent to parameter processing control module；
The detection parameters setup module, for the detection parameters of pneumatics machine testing and the numerical value of detection parameters to be arranged, and
The numerical value that will test parameter and detection parameters is sent to parameter processing control module；
The technological parameter management module, the technological parameter for being set in management system；
The real-time parameter acquisition module is sent for acquiring the parameter of air compressor machine test in real time, and by the parameter of acquisition
To parameter processing control module；
The parameter processing control module, for the parameter for the treatment of process parameter and acquisition, parameter for that will acquire with
The numerical value of detection parameters is compared, and is also used to generate air compressor machine test report and the device transmission control to detection air compressor machine refers to
It enables；
The display module, the air compressor machine test report generated for display parameters processing and control module；
The memory module is used for storage technology parameter and air compressor machine test report.
Wherein, the type of the air compressor machine includes: 220V asynchronous machine air compressor machine, 380V asynchronous machine air compressor machine, 220V
Magneto air compressor machine and 380V magneto air compressor machine.
Wherein, the technological parameter include: device model, outlet temperature, air accumulator temperature, volume flow, outlet pressure,
Reservoir pressure, pressure at expulsion, runing time, voltage, electric current, power, power factor (PF), maximum pressure and output mode.
Wherein, technological parameter further include: product number and technique number, technique number cannot number weight with existing technique
It is multiple.
Wherein, the detection parameters include: environment temperature, outlet temperature, air accumulator temperature, volume flow, outlet pressure,
Reservoir pressure, noise decibel, runing time, voltage, total current, apparent energy, power factor (PF), A phase current, B phase current and C
Phase current；The numerical value of the detection parameters include: temperature, air pressure, voltage and current numberical range.
Wherein, test macro is provided with user's registration, login interface, and user can choose on probation or registration user, registration
User afterwards can judge the rank of user according to the registration code that user inputs with login system, system, corresponding for user's matching
Interface.
Wherein, the test number of system is also shown in interface by way of chart.
Wherein, memory module uses SQL server data database storing.
A kind of automobile air compressor on-line testing method, the method step include: that operator is artificial according to air compressor machine type
Or by ERP system into air compressor machine test macro typing technological parameter, detection parameters and detection parameters numerical value；Air compressor machine is surveyed
Test system judges automatically air compressor machine classification, and sends control instruction to air compressor machine to pneumatics apparatus test device by Modbus RTU
It is tested；It is compared by the test data that acquisition sensor group 9 acquires air compressor machine in real time with the numerical value of detection parameters；Such as
Fruit data be abnormal then to pneumatics apparatus test device send alarm command carry out early warning, if data normally if generate air compressor machine
Examining report.
Wherein, industrial computer sends the permanent magnetism parameter in technological parameter about different model by Modbus Transmission Control Protocol
To permanent magnetic controller module group 8.
After test, according to the data analysis acquired in testing time section, calculates, obtain a series of production gas of air compressor machines
The performance parameters such as amount, efficiency, volume flow, are aggregated into test report, and test report is externally exported by output equipment, if
Test macro has successfully been docked with ERP in advance, and test result also can input company ERP system by ICP/IP protocol.
It is above-described be only a kind of automobile air compressor online testing device disclosed in this invention, system and method it is excellent
Select embodiment, it is noted that for those of ordinary skill in the art, in the premise for not departing from the invention design
Under, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Claims (10)
1. a kind of automobile air compressor online testing device, which is characterized in that described device includes: test cabinet, input equipment, industry control
Computer, PLC module group, intelligence instrument, miniature relay group, AC contact module group, permanent magnetic controller module group and acquisition
Sensor group, the input equipment, industrial PC, PLC module group, intelligence instrument, miniature relay group, AC contact module
Group, permanent magnetic controller module group and acquisition sensor group are installed in test cabinet, the input equipment, PLC module group, intelligence
Instrument and permanent magnetic controller module group pass through conducting wire and connect with industrial PC, the miniature relay group by conducting wire connection with
The connection of PLC module group, the AC contact module group are connect by conducting wire with miniature relay group, the acquisition sensor group
It is connect respectively with PLC module group and intelligence instrument by conducting wire；
The input equipment, the numerical value for technological parameter, detection parameters and detection parameters to industrial PC input air compressor machine；
The industrial PC, for handling the technological parameter of input and the data of acquisition sensor group acquisition；
The PLC module group, for judging the type and control miniature relay group work of air compressor motor according to technological parameter,
It is also used to obtain the data of acquisition sensor group acquisition；
The intelligence instrument, for obtaining the data of acquisition sensor group acquisition；
The miniature relay group, for controlling the work of AC contact module group；
The AC contact module group, is tested for the air compressor machine to asynchronous machine；
The permanent magnetic controller module group, is tested for the air compressor machine to magneto；
The acquisition sensor group, for acquiring the test data of air compressor machine.
2. automobile air compressor online testing device according to claim 1, which is characterized in that the acquisition sensor group packet
It includes: temperature sensor, pressure sensor, noise transducer, current transformer and voltage power measuring appliance, the temperature sensing
Device, pressure sensor and noise transducer are connect by conducting wire with PLC module group, the current transformer and voltage power measurement
Device is connect by conducting wire with intelligence instrument.
3. automobile air compressor online testing device according to claim 1 or 2, which is characterized in that pacify in the test cabinet
Equipped with alarm, the alarm is connect by conducting wire with industrial computer.
4. automobile air compressor online testing device according to claim 1 or 2, which is characterized in that peace in the test cabinet
Equipped with printing device, the printing device is connect by conducting wire with industrial computer.
5. automobile air compressor online testing device according to claim 4, which is characterized in that be equipped in the test cabinet
Cooling fan, the cooling fan are connect by conducting wire with industrial computer.
6. a kind of automobile air compressor Online Transaction Processing, which is characterized in that the system comprises: technological parameter setup module, inspection
Survey parameter setting module, technological parameter management module, real-time parameter acquisition module, parameter processing control module, display module and
Memory module；The technological parameter setup module, detection parameters setup module and real-time parameter acquisition module are and parameter processing
Control module connection, the technological parameter management module connect with memory module, the parameter processing control module respectively with show
Show that module is connected with memory module；
Technological parameter is arranged into system for the type according to air compressor machine, and technique is joined for the technological parameter setup module
Number is sent to parameter processing control module；
The detection parameters setup module, for the detection parameters of pneumatics machine testing and the numerical value of detection parameters to be arranged, and will inspection
The numerical value for surveying parameter and detection parameters is sent to parameter processing control module；
The technological parameter management module, the technological parameter for being set in management system；
The parameter of acquisition for acquiring the parameter of air compressor machine test in real time, and is sent to ginseng by the real-time parameter acquisition module
Number processing and control module；
The parameter processing control module, for the parameter for the treatment of process parameter and acquisition, parameter and detection for that will acquire
The numerical value of parameter is compared, and is also used to generate air compressor machine test report and sends control instruction to the device of detection air compressor machine；
The display module, the air compressor machine test report generated for display parameters processing and control module；
The memory module is used for storage technology parameter and air compressor machine test report.
7. automobile air compressor Online Transaction Processing according to claim 6, which is characterized in that the type packet of the air compressor machine
It includes: 220V asynchronous machine air compressor machine, 380V asynchronous machine air compressor machine, 220V magneto air compressor machine and 380V magneto pneumatics
Machine.
8. automobile air compressor Online Transaction Processing according to claim 7, which is characterized in that the technological parameter includes:
Device model, outlet temperature, air accumulator temperature, volume flow, outlet pressure, reservoir pressure, pressure at expulsion, runing time,
Voltage, electric current, power, power factor (PF), maximum pressure and output mode.
9. automobile air compressor Online Transaction Processing according to claim 7 or 8, which is characterized in that the detection parameters packet
It includes: when environment temperature, outlet temperature, air accumulator temperature, volume flow, outlet pressure, reservoir pressure, noise decibel, operation
Between, voltage, total current, apparent energy, power factor (PF), A phase current, B phase current and C phase current；The numerical value of the detection parameters
Include: temperature, air pressure, voltage and current numberical range.
10. a kind of automobile air compressor on-line testing method, which is characterized in that the method step includes: operator according to pneumatics
Machine type it is artificial or by ERP system into air compressor machine test macro typing technological parameter, detection parameters and detection parameters number
Value；Air compressor machine test macro judges automatically air compressor machine classification, and is sent and controlled to pneumatics apparatus test device by Modbus RTU
Air compressor machine is tested in instruction；The test data of air compressor machine and the numerical value of detection parameters are acquired in real time by acquiring sensor group
It is compared；Alarm command is sent to pneumatics apparatus test device if data are abnormal and carries out early warning, if data are normal
Then generate air compressor machine examining report.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110005602A (en) * | 2019-02-19 | 2019-07-12 | 广东艾林克能源装备有限公司 | A kind of air compressor intelligent test cabinet |
| CN110454427A (en) * | 2019-09-23 | 2019-11-15 | 势加透博洁净动力如皋有限公司 | A kind of two-stage gas suspension centrifugal air compressor Performance Test System and method |
| CN111367264A (en) * | 2020-04-30 | 2020-07-03 | 苏州鹏迈智能科技有限公司 | Online test system of thermal management system |
| CN111911405A (en) * | 2020-08-21 | 2020-11-10 | 河北昊方新能源科技有限公司 | Air compressor machine performance test device |
| CN111980908A (en) * | 2020-09-19 | 2020-11-24 | 浙江创源环境科技股份有限公司 | Compressed air system efficiency evaluation device and evaluation method |
| CN112524014A (en) * | 2020-11-04 | 2021-03-19 | 衢州市质量技术监督检测中心 | Frequency conversion air compressor detecting system |
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| CN110005602A (en) * | 2019-02-19 | 2019-07-12 | 广东艾林克能源装备有限公司 | A kind of air compressor intelligent test cabinet |
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| CN112524014A (en) * | 2020-11-04 | 2021-03-19 | 衢州市质量技术监督检测中心 | Frequency conversion air compressor detecting system |
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Application publication date: 20190118 |