CN105715530B - A kind of converter valve cooling system water pump accelerated life test platform and its test method - Google Patents
A kind of converter valve cooling system water pump accelerated life test platform and its test method Download PDFInfo
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- CN105715530B CN105715530B CN201410735161.5A CN201410735161A CN105715530B CN 105715530 B CN105715530 B CN 105715530B CN 201410735161 A CN201410735161 A CN 201410735161A CN 105715530 B CN105715530 B CN 105715530B
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- 238000012360 testing method Methods 0.000 title claims abstract description 137
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000001816 cooling Methods 0.000 title claims abstract description 22
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
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Abstract
The present invention relates to a kind of converter valve cooling system water pump accelerated life test platform and its test method, test platform includes connecting the pressure charging system to form closed-loop path, drive system and temperature control system by circulating line, heat power supply device, temperature measuring equipment, pressure sensor, booster pump and the PLC converter plants of test platform are connected with central processing unit, and instruction is sent by central processing unit, realize automatically controlling for test platform.The accelerated life test, the accelerated life test of rotating speed accelerated factor and the accelerated life test of Temperature Accelerating Factor in Life Test of pressure accelerated factor can be realized by test platform, the present invention goes average life span of the water pump under normal stress level of extrapolating using average life span of the water pump under accelerated stress level, accelerated factor is determined, realizes the assessment to pump performance.To shortening the R＆D cycle, the reliability of raising water pump is extremely important, and is that the research and development of high-performance, high-pressure high-flow water pump accumulate reliable test data.
Description
Technical field
The present invention relates to a kind of test platform of DC transmission system and its test method, in particular to a kind of converter valve
Cooling system water pump accelerated life test platform and its test method.
Background technology
The development of current power equipment product is maked rapid progress, and higher requirement is proposed to the life and reliability of product.
With the raising of the life and reliability of product, traditional test method is such as continued to use, then test period and experiment funds will be big
Amount increase.Simultaneously because the high speed development of science and technology, the speed of model change is more and more fast, and there is an urgent need to when shorter
The interior life information for obtaining product.Therefore it is necessary to the method for new shortening test period is studied to adapt to life of product and can
By property ever increasing need.Accelerated life test is exactly paid attention to and grown up in this case.Accelerated aging
The research of experiment receives extensive attention in reliability test engineering field.
Accelerated life test belongs to statistical test category.It is the profit on the basis of reasonable engineering and statistical hypothesis is carried out
With the statistical model related to physical failure rule to believing in the reliability obtained under the horizontal acceleration environment of normal stress
Breath is changed, and obtains a kind of test method of product reproducible Numerical value of reliability characteristic under specified stress level.
In short, accelerated life test is under conditions of keeping failure mechanism constant, shorten experiment week by increasing proof stress
A kind of life test method of phase.Accelerated life test carries out the life test of product using accelerated stress level, so as to contract
Short test period, improves test efficiency, reduces experimentation cost.
Corresponding intellectual monitoring is provided with to its capital equipment in industries such as nuclear power, thermal power generation, D.C. high voltage transmissions
System, to ensure the security reliability of its operation.But then rested essentially within periodically for the auxiliary equipment of water pump, blower fan etc
Check, maintenance down and lower stage of accident analysis afterwards, and developed country mostly employs to large rotating machinery equipment
The overall monitor maintenance of " centered on reliability ", therefore, " weight main frame, light subsidiary engine；The thought of protection, light analysis again " can not
Meet the Effec-tive Function of modern enterprise, the fail-safe analysis for subsidiary engines such as water pump, blower fans is also increasingly paid attention to by enterprise.
There is scientific research personnel to carry out related research to the reliability of water pump to thermoelectricity field in nuclear power at present, still
It is relatively fewer in the related research of high-voltage dc transmission electrical domain, and converter valve cooling system is the important set of whole straight-flow system
Part, its key componentses water pump are the power-equipments of converter valve cooling system, directly influence the reliability of cooling system.And water
Pump is studied its reliability according to traditional test method, not only lost time but also unrestrained as a kind of plant equipment of high reliability
Take funds, therefore test period is both shortened to study using the test method of accelerated aging, improve test efficiency again, also drop
Low experimentation cost.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of examination of converter valve cooling system water pump accelerated aging
Platform and its test method are tested, the present invention is gone according to accelerated aging curve using average life span of the water pump under accelerated stress level
Average life span of the extrapolation water pump under normal stress level, determines accelerated factor, realizes the assessment to pump performance.Shortening is ground
Hair cycle, the reliability of raising water pump are extremely important, and the research and development accumulation for high-performance, high-pressure high-flow water pump can
The test data leaned on.
The purpose of the present invention is realized using following technical proposals：
The present invention provides a kind of accelerated life test platform for converter valve cooling system water pump, and its improvements exists
In the test platform includes pressure charging system, drive system and temperature control system, the pressure charging system, drive system and temperature
Degree control system connects to form closed-loop path by circulating line；The heat power supply device and temperature measuring equipment of the temperature control system,
The pressure sensor and booster pump of pressure charging system and the PLC converter plants of drive system are connected with central processing unit, and lead to
Cross central processing unit and send instruction, realize automatically controlling for test platform.
Further, the pressure charging system includes water tank, booster pump, pressure sensor and vacuum tank；The water tank is with increasing
Press pump is connected by pipeline；The booster pump and vacuum tank are connected on circulating line, and the pressure sensor is symmetricly set on
Vacuum tank both sides；Test platform is pressurizeed by booster pump, and ensures that the stable setting pressure that maintains of test platform (is set
Constant-pressure is 1.2~1.5 times of normal operation pressure) under run, realize the accelerated life test of pressure accelerated factor；
Pipeline between circulating line and water tank and booster pump uses seamless steel pipe.
Further, the drive system includes the subject water pump and PLC converter plants connected by pipeline, the subject
Water pump is connected on circulating line；Change the rotating speed of subject water pump by changing the running frequency of subject pump motor, realize
The accelerated life test of rotating speed accelerated factor.
Further, the PLC converter plants are PLC frequency converters；Pipeline between subject water pump and PLC converter plants is adopted
Use seamless steel pipe.
Further, the temperature control system includes heat power supply device and temperature measuring equipment, and the temperature measuring equipment is arranged on heat
The both ends of source device, the medium temperature of test platform is heated up by heat power supply device, and ensure the stable dimension of test platform
Hold and transported under design temperature (design temperature is 1,05~1.25 times of normal operating temperature, and temperature is absolute temperature, and unit is K)
OK, the accelerated life test of Temperature Accelerating Factor in Life Test is realized.
Further, the heat power supply device is the constant temperature heating device that PLC frequency converters automatically control, by main circulation pump, dress
There are heating tank, two surge tanks, nitrogen stabilization pressure tank, liquid level gauge, pressure gauge, temperature sensor, the pressure sensing of four heaters
Device and flow sensor composition；
The main circulation pump, temperature sensor, pressure sensor, pressure gauge and flow sensor are arranged on circulating line
On, fed back by the signal of above-mentioned instrument (including temperature sensor, pressure sensor, pressure gauge and flow sensor), experiment
The control system of platform the heater being turned on and off on heating tank, is exchanged simultaneously according to the fluid operating parameter of test requirements document
The pressure and flow for flowing valve cooling system are controlled, and the medium of heating tank is entered test device by main circulation pump by pipeline,
Heating tank is recycled into by the medium after test device again, carries out continuous circulation work.Surge tank passes through triple valve and master
Circulation line connects, and nitrogen stabilization pressure tank is in parallel with surge tank, liquid level gauge on the surge tank, when major cycle pipeline intermediary's matter because
When a small amount of evaporation or filter loss, medium is pressed into major cycle pipeline by surge tank, to keep the pressure of pipeline constant and medium
It is full of；
The temperature measuring equipment uses temperature sensor.
Further, the pressure charging system, drive system and temperature control system are separate, carry out the acceleration of single stress
The accelerated life test of life test or more stress.
The present invention also provides a kind of test method of converter valve cooling system water pump accelerated life test platform, and it improves it
It is in the test method includes accelerated life test, the accelerated life test of rotating speed accelerated factor of pressure accelerated factor
With the accelerated life test of Temperature Accelerating Factor in Life Test.
Further, ensure medium full of the pipeline between circulating line, water tank and booster pump and subject water before the test
Pipeline between pump and PLC converter plants.
Further, the booster pump for starting pressure charging system carries out supercharging to test platform until being added to subject pressure stopping,
Booster pump is controlled by central processing unit, it is ensured that when the pressure value of test platform reduces 1% compared with tested pressure value, start
Booster pump is pressurized, and stops supercharging when the pressure value of test platform exceedes the 1% of tested pressure value, then will not by vacuum tank
Stable system pressure is stably maintained at tested pressure value (tested pressure value is 1.2~1.5 times of normal operation pressure), realizes
The accelerated life test of pressure accelerated factor；
Rotating speed is changed by the running frequency of the PLC converter plants change subject pump motor in drive system, realized
The accelerated life test of rotating speed accelerated factor；
The medium in circulating line is heated by heat power supply device, adding for heat power supply device is controlled by central processing unit
Hot temperature, it is ensured that begun to warm up when when the temperature value of test platform reduces 1K compared with dut temperature value, when test platform
Temperature value stops heating when exceeding dut temperature value 1K, the temperature stabilization of test platform is maintained dut temperature value (by thermometric
Angle value is 1,05~1.25 times of normal operating temperature), realize the accelerated life test of Temperature Accelerating Factor in Life Test.
Pressure value in test platform is connected by pressure sensor with central processing unit；Temperature value passes through temperature sensor
It is connected with central processing unit；The tachometer value of water pump is connected by speed probe with central processing unit, the pressure sensor, temperature
Degree sensor and speed probe gather and record respectively corresponding to pressure, temperature and pump rotary speed information, and by the letter of collection
Breath is fed back on central processing unit, facilitates operating personnel that data are collected with arrangement；
Alarming value is set in the control program of central processing unit, when occurring actual value during experiment and exceeding warning value
Alarm and be automatically stopped experiment, to avoid the generation of danger；
The reserved interface of the test platform is rapid translating interface, and interface pair is realized for the water pump of different model
Connect, constantly to be transformed test platform.
Compared with the prior art, the beneficial effect that reaches of the present invention is：
1) present invention removes water pump of extrapolating according to accelerated aging curve using average life span of the water pump under accelerated stress level
Average life span under normal stress level, determines accelerated factor, realizes the assessment to pump performance.To shorten the R＆D cycle,
The reliability for improving water pump is extremely important, and is the reliable examination of research and development accumulation of high-performance, high-pressure high-flow water pump
Test data.
2) sensitive components in test platform and sensor etc. are protected, measurement point is accessed by system by data wire
In system, and component is fixed on outside system in itself, is so achieved that component is accessed and isolated from system, is improved first device
The service life of part, reduce the fault rate during experiment.
3) each control unit in test platform is controlled using computer, utilizes automatic data collection, recording equipment pair
Various signal messages are acquired, and improve the automaticity of test platform.
4) necessary warning device is provided with, occurs actual value during experiment more than warning value alarm and stops automatically
Only test, avoid the generation of danger, improve the degree of protection to test platform.
5) test platform reserves various interfaces, convenient that platform is transformed, and the pump of various different models is entered with facilitating
Row accelerated life test, the scope of application of platform is extended, improve the versatility of test platform.
6) test platform pipeline is all using seamless steel pipe, it is therefore prevented that destruction of the high-potting to pipeline.
Brief description of the drawings
Fig. 1 is converter valve cooling system water pump accelerated life test platform structure schematic diagram provided by the invention, wherein：1.
Heat power supply device；2. water tank；3.PLC converter plants；4. temperature sensor；5. pressure sensor；6. booster pump；7. vacuum tank；8.
It is tested water pump；A. pressure charging system；B. drive system；C. temperature control system；D. central processing unit.
Embodiment
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Direct current transmission converter valve cooling system, including major cycle water pump, heating tank, air radiator, main filter, the change of current
Valve and degassing tank；The major cycle exit of pump, heating tank, air radiator, main filter, converter valve, degassing tank and master follow
Ring unit fixed on water pump suction is connected in turn to form circulation loop by pipeline.
The direct current transmission converter valve cooling system includes water process loop, and the water process loop includes ion-exchanger
And accurate filter, the water process loop is in parallel with converter valve, and the ion-exchanger is connected with accurate filter, it is described from
Sub- exchanger and accurate filter are equipped with standby.
The direct current transmission converter valve cooling system includes nitrogen stabilization pressure system, and the nitrogen stabilization pressure system includes expansion drum
And nitrogen cylinder, expansion drum are connected with accurate filter, nitrogen cylinder expansion drum connection, the expansion drum is two and connected, nitrogen cylinder
Provided with standby.Direct current transmission converter valve cooling system includes automatic water replenishing system, and the automatic water replenishing system includes being sequentially connected
Raw water pump, moisturizing filter, raw water tank, small pump and moisturizing motor-driven valve, moisturizing motor-driven valve is connected with ion-exchanger, described
Small pump is provided with standby.Heating tank includes at least one electric heater.Degassing tank includes at least one electric heater.
Direct current transmission converter valve cooling system includes electric T-shaped valve, butterfly valve and ball valve, and electric T-shaped valve is connected with butterfly valve
It is in parallel after ball valve, it is connected between heating tank and major cycle water pump, the end of electric T-shaped valve the 3rd is connected with main filter import,
The butterfly valve and electric T-shaped valve are equipped with standby.
Major cycle water pump, heating tank and main filter are equipped with standby.Converter valve and degassing tank are provided with fragrant road.Water process is returned
Road and conductivity measurement branch circuit parallel connection.
The present invention provides a kind of test platform for the more stress accelerated life tests of converter valve cooling system water pump, can
Realize the accelerated life test of three kinds of pressure, rotating speed and temperature accelerated factors.
Test platform is made up of pressure charging system A, drive system B and temperature control system C three parts.Three subsystems are mutual
It is independent, it is non-interference, can isolated operation, can also run simultaneously, they are connected by circulating line, form following for closure
Loop back path, heat power supply device 1, PLC converter plants 3, temperature sensor 4, pressure sensor 5, booster pump 6 in system with center
Processor D is connected, and sends instruction by central processing unit D, realizes automatically controlling for system.
As shown in figure 1, be converter valve cooling system water pump accelerated life test platform structure schematic diagram provided by the invention,
Pressure charging system A is made up of water tank 2, booster pump 6, pressure sensor 5 and vacuum tank 7, and the water tank is connected with booster pump by pipeline
Connect；The booster pump and vacuum tank are connected on circulating line, and the pressure sensor is symmetricly set on vacuum tank both sides；Set
Pressure charging system A purpose is that system is pressurizeed by booster pump, and ensures that system stable maintaining is transported under setting pressure
OK, the accelerated life test of pressure accelerated factor is realized.Pipeline between circulating line and water tank and booster pump uses nothing
Stitch steel pipe.
Drive system B includes the subject water pump 8 and PLC converter plants 3 connected by pipeline, and the subject water pump 8 connects
On circulating line；Change the rotating speed of subject water pump by changing the running frequency of the subject motor of water pump 8, realize that rotating speed accelerates
The accelerated life test of the factor.PLC converter plants 3 are PLC frequency converters；The pipeline being tested between water pump 8 and PLC converter plants 3
Using seamless steel pipe, the purpose for setting drive system B is to change the rotating speed of water pump by changing the running frequency of pump motor,
Realize the accelerated life test of rotating speed accelerated factor.
Temperature control system C includes heat power supply device and temperature measuring equipment, and the temperature measuring equipment is arranged on the both ends of heat power supply device,
The purpose for setting temperature control system C is that the medium temperature of whole system is heated up by heat power supply device, and ensures system
Stable maintenance is run at a set temperature, realizes the accelerated life test of Temperature Accelerating Factor in Life Test.Heat power supply device is PLC frequency converters
The constant temperature heating device automatically controlled, temperature measuring equipment are temperature sensor.
By being designed to water pump accelerated life test platform, it is special that key sensor and key componentses are taken
Safeguard measure and design, reduce the influence impacted to it of various accelerated stress during experiment.Using industrial computer to whole
The component of test platform carries out Automatic Control and collection, and the various state values of platform interior during experiment are monitored
And alarm, improve the degree of protection to test platform.Test platform reserves various interfaces, convenient that platform is transformed, with
The convenient pump to various different models carries out accelerated life test, extends the scope of application of platform.
The key componentses in test platform and sensor etc. are protected in the design process, by the component of key
Access and isolate from system, improve the service life of component, reduce the fault rate during experiment；Use computer
Each control unit in test platform is controlled, various signal messages are acquired using automatic data collection, recording equipment,
Improve the automaticity of test platform；There is provided necessary warning device, occurs actual value during experiment and exceedes police
Ring value alarm is simultaneously automatically stopped experiment, avoids the generation of danger；In the design process, the operation principle and work of various pumps are considered
Make form, improve the versatility of test platform.
The present invention also provides a kind of test method of converter valve cooling system water pump accelerated life test platform, is being added
During fast life test, testing position will be arranged on by pump testing, and whole test platform is formed the circulation loop of a closure, experiment
Before ensure that medium is full of whole pipeline.Start booster pump and supercharging is carried out to whole system until being added to subject pressure stopping, passing through
Central processing unit controls booster pump, it is ensured that starts booster pump supercharging when system pressure is less than a certain pressure value, reaches a certain
Stop supercharging during pressure value, unstable pressure stability is then maintained by tested pressure value (tested pressure value by vacuum tank
For 1.2~1.5 times of normal operation pressure), realize the accelerated life test of pressure accelerated factor.Pass through PLC converter plants pair
Rotating speed is changed by Frequency by the motor of pump testing, realizes the accelerated life test of rotating speed accelerated factor.Pass through heat power supply device
Medium is heated, the heating-up temperature of heat power supply device is controlled by central processing, it is ensured that when system temperature is less than a certain temperature
Heated during angle value, stop heating when reaching a certain temperature value, whole system is stably maintained at dut temperature value (dut temperature value
For the 1 of normal operating temperature, 05~1.25 times) left and right, realize the accelerated life test of Temperature Accelerating Factor in Life Test.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
The present invention is described in detail with reference to above-described embodiment for pipe, and those of ordinary skill in the art still can be to this hair
Bright embodiment is modified or equivalent substitution, these without departing from spirit and scope of the invention any modification or
Equivalent substitution, applying within pending claims of the invention.
Claims (8)
- A kind of 1. accelerated life test platform for converter valve cooling system water pump, it is characterised in that the test platform bag Pressure charging system, drive system and temperature control system are included, the pressure charging system, drive system and temperature control system pass through circulation Pipeline connects to form closed-loop path；Heat power supply device and temperature measuring equipment, the pressure sensing of pressure charging system of the temperature control system Device and booster pump and the PLC converter plants of drive system are connected with central processing unit, and send finger by central processing unit Order, realizes automatically controlling for test platform；The heat power supply device is the constant temperature heating device that automatically controls of PLC frequency converters, by main circulation pump, equipped with four heaters Heating tank, two surge tanks, nitrogen stabilization pressure tank, liquid level gauge, pressure gauge, temperature sensor, pressure sensor and flow sensor Composition；The main circulation pump, temperature sensor, pressure sensor, pressure gauge and flow sensor are arranged on circulating line, are delayed Rush tank to be connected with circulating line by triple valve, nitrogen stabilization pressure tank is in parallel with surge tank, and liquid level gauge is arranged on surge tank；The temperature measuring equipment uses temperature sensor.
- 2. test platform as claimed in claim 1, it is characterised in that the pressure charging system includes water tank, booster pump, pressure and passed Sensor and vacuum tank；The water tank is connected with booster pump by pipeline；The booster pump and vacuum tank are connected on circulating line, The pressure sensor is symmetricly set on vacuum tank both sides；Test platform is pressurizeed by booster pump, and ensures that experiment is flat Platform stable maintaining is run under setting pressure, realizes the accelerated life test of pressure accelerated factor；Pipeline between circulating line and water tank and booster pump uses seamless steel pipe.
- 3. test platform as claimed in claim 1, it is characterised in that the drive system includes the subject connected by pipeline Water pump and PLC converter plants, the subject water pump are connected on circulating line；By the running frequency for changing subject pump motor To change the rotating speed of subject water pump, the accelerated life test of rotating speed accelerated factor is realized.
- 4. test platform as claimed in claim 3, it is characterised in that the PLC converter plants are PLC frequency converters；It is tested water Pipeline between pump and PLC converter plants uses seamless steel pipe.
- 5. test platform as claimed in claim 1, it is characterised in that the temperature control system includes heat power supply device and thermometric Device, the temperature measuring equipment are arranged on the both ends of heat power supply device, and the medium temperature of test platform is risen by heat power supply device Temperature, and ensure that the stable maintenance of test platform is run at a set temperature, realize the accelerated life test of Temperature Accelerating Factor in Life Test.
- 6. test platform as claimed in claim 1, it is characterised in that the pressure charging system, drive system and temperature control system System is separate, carries out the accelerated life test of single stress or the accelerated life test of more stress.
- A kind of 7. accelerated life test platform for converter valve cooling system water pump as any one of claim 1-6 Test method, it is characterised in that the accelerated life test of the test method including pressure accelerated factor, rotating speed accelerated factor Accelerated life test and Temperature Accelerating Factor in Life Test accelerated life test；The booster pump for starting pressure charging system carries out supercharging to test platform until being added to subject pressure stopping, passing through central processing unit Control booster pump, it is ensured that when the pressure value of test platform reduces 1% compared with tested pressure value, start booster pump supercharging, work as examination Stop supercharging when testing the pressure value of platform more than be tested pressure value 1%, it is then by vacuum tank that unstable system pressure is steady Surely tested pressure value is maintained, realizes the accelerated life test of pressure accelerated factor；Rotating speed is changed by the running frequency of the PLC converter plants change subject pump motor in drive system, realizes rotating speed The accelerated life test of accelerated factor；The medium in circulating line is heated by heat power supply device, the heating temperature of heat power supply device is controlled by central processing unit Degree, it is ensured that begun to warm up when the temperature value of test platform reduces 1K compared with dut temperature value, when the temperature value of test platform Stop heating during more than dut temperature value 1K, the temperature stabilization of test platform is maintained dut temperature value, realize that temperature accelerates The accelerated life test of the factor；Pressure value in test platform is connected by pressure sensor with central processing unit；Temperature value is by temperature sensor with Central processor connects；The tachometer value of water pump is connected by speed probe with central processing unit, and the pressure sensor, temperature pass Sensor and speed probe gather and record respectively corresponding to pressure, temperature and pump rotary speed information, it is and the information of collection is anti- It is fed on central processing unit；Alarming value is set in the control program of central processing unit, occurs actual value during experiment and exceedes warning value alarm And experiment is automatically stopped, to avoid the generation of danger；The reserved interface of the test platform is rapid translating interface, realizes that interface docks for the water pump of different model, with Test platform is transformed.
- 8. test method as claimed in claim 7, it is characterised in that ensure medium full of circulating line, water tank before the test The pipeline between pipeline and subject water pump and PLC converter plants between booster pump.
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| CN108195605A (en) * | 2016-12-08 | 2018-06-22 | 山东省农业机械科学研究院 | A kind of water pump flow production line intelligence on-line checking testing stand |
| CN109990948A (en) * | 2019-01-14 | 2019-07-09 | 珠海九圆能源设备制造有限公司 | A kind of pressurization of pressure testing and recovery system and its control method |
| CN109869308B (en) * | 2019-03-25 | 2020-02-21 | 华中科技大学 | Method for testing accelerated life of micro pump |
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| CN110645197B (en) * | 2019-10-12 | 2021-02-02 | 苏州浪潮智能科技有限公司 | Method and system for detecting service life of fan |
| CN113446210B (en) * | 2021-06-21 | 2024-07-23 | 广州市科叶环保科技有限公司 | Water pump life reliability acceleration test device |
| CN114485778B (en) * | 2021-12-27 | 2023-07-14 | 广州高澜节能技术股份有限公司 | Automatic checking device and method for FACTS cooling equipment |
| CN116292242B (en) * | 2023-01-13 | 2024-03-12 | 合肥新沪屏蔽泵有限公司 | Water pump accelerated life test system |
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| CN101440799A (en) * | 2008-12-05 | 2009-05-27 | 奇瑞汽车股份有限公司 | Steering oil pump durability test apparatus |
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