CN110261091A - A kind of variable pump dry testing method and device - Google Patents
A kind of variable pump dry testing method and device Download PDFInfo
- Publication number
- CN110261091A CN110261091A CN201910613133.9A CN201910613133A CN110261091A CN 110261091 A CN110261091 A CN 110261091A CN 201910613133 A CN201910613133 A CN 201910613133A CN 110261091 A CN110261091 A CN 110261091A
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- adjustment ring
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- way electromagnetic
- electromagnetic valve
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- 238000012360 testing method Methods 0.000 title claims abstract description 82
- 238000006073 displacement reaction Methods 0.000 claims abstract description 55
- 241000009298 Trigla lyra Species 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000011068 loading method Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000011900 installation process Methods 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 4
- 230000008602 contraction Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The present invention discloses a kind of variable pump adjustment ring detection dry testing method；It is characterized by: the first step, displacement sensor initial displacement is set as zero.Second step continues boost charge-air to adjustment ring control piper；Terminal is gone to when adjustment ring starts to rotate up to around pin shaft；The displacement sensor gauge head being in close contact with adjustment ring side is detected simultaneously and is acquired from starting point to the end displacement data；Third step reduces control piper air pressure, detects and acquire the displacement data that adjustment ring is back to starting point whole process around pin shaft rotation again to terminal；4th step, PLC calculate second step and third step shift differences；5th step inflates maximum pressure value within the upper and lower limits of setting, adjustment ring works well if second step and third step shift differences are zero；Second step is not zero with third step shift differences, and adjustment ring has operating clamping stagnation or spare part outside measurement is overproof；It inflates maximum pressure value and exceeds lower range, adjustment ring spring rate is incorrect or there are adjustment ring spring neglected loadings.
Description
Technical field
The invention belongs to lubricating oil pump and gauge check technical field, it is related to a kind of variable pump dry testing method and device；
In particular to the variable pump dry testing method and device that a kind of adjustment ring is adjusted, adjust especially suitable for various blade variable pumps
The detection of ring working condition.
Background technique
Traditional variable pump adjustment ring working condition detection uses hydraulic oil as test(ing) medium, rating test oil temperature,
Under viscosity, speed conditions, judge whether adjustment ring is working properly by revolving speed, flow curve.
Traditional oils formula test method, experimentation cost is high, and beat is slow, and product will be drained after test, and test produces after draining
Have oily residual in product, there is certain pollution to product, product cleannes index is not easy to reach, to storage, transport and it is user assembled
Using making troubles.
Summary of the invention
The invention discloses a kind of variable pump dry testing method and devices, are tested with solving oil medium in the prior art,
The problems such as experimentation cost is high, beat is slow, oil remains after test.
A kind of variable pump adjustment ring of the present invention detects dry testing method:
The first step, displacement sensor gauge head are in close contact adjustment ring side；Original state, adjustment ring are in start position, displacement
Sensor initial displacement is set as zero.
Second step continues boost charge-air to adjustment ring control piper；It is greater than adjustment ring when acting on atmospheric pressure in adjustment ring
When spring is to its supporting force, adjustment ring starts to rotate forward around pin shaft until adjustment ring stops operating, and adjustment ring is in terminal position
It sets；The displacement sensor gauge head being in close contact with adjustment ring side, which detects simultaneously and acquires adjustment ring, rotates forward displacement data.
Third step reduces control piper air pressure, acts on atmospheric pressure in adjustment ring and is less than adjustment ring spring to its supporting force
When adjustment ring inversely return to reset, until adjustment ring stops operating, reach reduction point；The displacement being in close contact with adjustment ring side
Transducer probe assembly detects and acquires the displacement data that adjustment ring is back to reduction point whole process around pin shaft backwards rotation simultaneously.
4th step, PLC calculate first step adjustment ring and rotate forward stroke around pin shaft and inversely turn with adjustment ring around pin shaft
The shift differences of dynamic stroke.
5th step, if adjustment ring around pin shaft rotate forward stroke it is equal with the standard value of setting and and adjustment ring around pin
The shift differences of axis backwards rotation stroke are zero, inflate maximum pressure value within the upper and lower limits of setting, adjustment ring operating
Normally；If adjustment ring around pin shaft rotate forward stroke be less than setting standard value or and adjustment ring around pin shaft backwards rotation row
The shift differences of journey are not zero, and adjustment ring has the not in place, clamping stagnation of operating or spare part outside measurement is overproof；Inflate maximum pressure value
Beyond lower range, adjustment ring spring rate is incorrect or there are adjustment ring spring neglected loadings；
Gas flowmeter detection gas test(ing) medium flow judges each component installation of adjustment ring within the upper and lower limits of setting
Correctly；Determine to lack part in installation process beyond normal range (NR) or spare part outside measurement is overproof, mistake proofing is played on assembly line
Function.
Test object variable pump of the present invention includes variable pump case, adjustment ring, pin shaft, adjustment ring spring；Variable pump case
It is upper that there is adjustment ring control piper.
A kind of variable pump adjustment ring of the present invention detects dry testing device, comprising: gas source, pressure regulator valve, proportional pressure-reducing valve, increasing
Depressor, exhaust two-way electromagnetic valve, gas tank, gas flowmeter, pressure sensor, inflation two-way electromagnetic valve, displacement sensor branch
Frame, displacement sensor, electric control gear；Gas source, pressure regulator valve, proportional pressure-reducing valve, booster, exhaust two-way electromagnetic valve, gas tank, gas
Flowmeter body, pressure sensor, inflation two-way electromagnetic valve are sequentially connected in series piping connection；It inflates two-way electromagnetic valve and test object becomes
Amount pump adjustment ring control piper is connected；Proportional pressure-relief valve control pressurization speed, it is ensured that detection it is accurate and repeated；Pressurization
Device, gas tank ensure that moment provides the aeration quantity of enough increases in test；Exhaust two-way electromagnetic valve be connected to gas tank with than
On pipeline between example pressure reducing valve；Displacement sensor ontology is fixed on displacement sensor bracket, and displacement sensor gauge head is close
It is pressed against adjustment ring side, detects adjustment ring displacement data at any time；Electric control gear and gas flowmeter, pressure sensor, inflation
Two-way electromagnetic valve, exhaust two-way electromagnetic valve, displacement sensor electricly connect.
Original state, adjustment ring are in start position, and exhaust two-way electromagnetic valve, inflation two-way electromagnetic valve are closed；Ratio subtracts
Pressure valve will be by the gas test pressure medium stable regulation of pressure regulator valve to initial pressure value, it is ensured that supplies and stablizes gas source；
When starting test, inflation two-way electromagnetic valve is opened, and gas source is persistently inflated to adjustment ring control piper and is pumped into gas test
Medium；One constant-speed ratio precise pressure regulation is pressed by proportional pressure-reducing valve by the gas test medium of pressure regulator valve；It is defeated by proportional pressure-reducing valve
Gas test medium out is persistently pressurized through booster to gas tank；Gas test medium is through gas tank, gas flowmeter, pressure
The adjustment ring control piper inflation that sensor, inflation two-way electromagnetic valve are pumped to experimental test object variable；
When acting in adjustment ring atmospheric pressure and being greater than adjustment ring spring to its supporting force, adjustment ring starts to rotate forward around pin shaft
Until adjustment ring stops operating, adjustment ring is in final position；Then proportional pressure-reducing valve reduces control piper air pressure, acts on tune
When atmospheric pressure is less than adjustment ring spring to its supporting force on the domain, adjustment ring inversely returns to reset, until adjustment ring stops operating,
Reach reduction point；In the process, the displacement sensor being in close contact with adjustment ring, while detecting and acquiring adjustment ring forward direction and turning
The displacement data of dynamic stroke and backwards rotation stroke whole process, if adjustment ring rotates forward standard value phase of the stroke with setting
Deng and be zero with backwards rotation travel displacement difference, adjustment ring works well, otherwise abnormal.
It can determine whether that there are catching phenomenon, the gas tests of pressure sensor detection additionally by the blowing pressure maximum value
Pressure medium value illustrates that adjustment ring is working properly within the upper and lower limits of setting；Otherwise adjustment ring work is abnormal；Test
Pressure medium value is more than upper range, and there are clamping stagnations for test object variable pump adjustment ring；Test(ing) medium pressure value is more than lower limit model
It encloses, adjustment ring spring rate is incorrect or there are adjustment ring spring neglected loadings；
Gas flowmeter detection gas test(ing) medium flow illustrates adjustment ring, variable pump case within the upper and lower limits of setting
Each component installation is correct, illustrates to lack part in installation process beyond upper and lower limits or spare part outside measurement is overproof, realize dress
Mistake proofing on wiring.
After adjustment ring resets, inflation two-way electromagnetic valve is closed, and exhaust two-way electromagnetic valve is opened, gas examination in experimental rig
It tests medium and passes through exhaust two-way electromagnetic valve exhaust；When the gas test pressure medium value of pressure sensor detection is lower than initial pressure
When value, exhaust two-way electromagnetic valve is closed；Proportional pressure-reducing valve, which adjusts gas test pressure medium, to restore to initial pressure value, this wheel
Off-test, in case test next time；Ensure test repeatability precision.
Displacement sensor of the present invention is contraction type, and gauge head is closely pressed against adjustment ring side by internal small spring,
Adjustment ring displacement data is detected at any time.
The invention also includes a mufflers；Muffler and exhaust two-way electromagnetic valve piping connection, eliminate exhaust noise.
The positive effect of the present invention is: variable pump adjustment ring detects dry testing accurately and repeatable accuracy is very high；It is right
Adjustment ring is stuck or clamping stagnation and whether misloading and neglected loading part are very easy to detected；Test method is simple, and cost is extremely low, examination
It is very short to test the period, does not influence product cleannes index, good operational environment, transport convenience.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is that displacement sensor of the present invention detects variable pump adjustment ring starting point and reduction point position view；
Fig. 3 is that displacement sensor of the present invention detects variable pump adjustment ring final position schematic diagram；
In figure: 1 gas source, 2 pressure regulator valves, 3 proportional pressure-reducing valves, 4 boosters, 5 exhaust two-way electromagnetic valves, 6 mufflers, 7 gas tanks, 8
Gas flowmeter, 9 pressure sensors, 10 inflation two-way electromagnetic valves, 11 adjustment ring control pipers, 12 adjustment ring springs, 13 displacements
Sensor stand, 14 displacement sensors, 15 adjustment rings, 16 variable pump cases, 17 pin shafts.
Specific embodiment
Below in conjunction with attached drawing one embodiment that the present invention will be described in detail.
Test object variable pump of the present invention is as shown in Fig. 2, include variable pump case 16, adjustment ring 15, pin shaft 17, adjustment ring
Spring 12；There is adjustment ring control piper 11 in variable pump case.
A kind of variable pump adjustment ring detection dry testing Installation practice of the present invention is as shown in Figure 1 and Figure 2, comprising: gas source 1,
Pressure regulator valve 2, proportional pressure-reducing valve 3, booster 4, exhaust two-way electromagnetic valve 5, muffler 6, gas tank 7, gas flowmeter 8, pressure
Sensor 9, inflation two-way electromagnetic valve 10, displacement sensor bracket 13, displacement sensor 14, electric control gear；Gas source 1, pressure regulator valve
2, proportional pressure-reducing valve 3, booster 4, exhaust two-way electromagnetic valve 5, gas tank 7, gas flowmeter 8, pressure sensor 9, inflation two
Three-way electromagnetic valve 10 is sequentially connected in series piping connection；Inflate two-way electromagnetic valve 10 and 11 phase of test object variable pump adjustment ring control piper
Connection；Proportional pressure-reducing valve 3 control pressurization speed, it is ensured that detection it is accurate and repeated；Booster 4, gas tank 7 ensure to test
Middle moment provides the aeration quantity of enough increases；Exhaust two-way electromagnetic valve 5 is connected between gas tank 7 and proportional pressure-reducing valve 3
On pipeline；14 ontology of displacement sensor is fixed on displacement sensor bracket 13, and displacement sensor 14 is contraction type, displacement sensing
14 gauge head of device is closely pressed against 15 side of adjustment ring by internal small spring, detects adjustment ring displacement data at any time；Automatically controlled dress
It sets automatically controlled with gas flowmeter 8, pressure sensor 9, inflation two-way electromagnetic valve 10, exhaust two-way electromagnetic valve 5, displacement sensor 14
Connection.Muffler 6 and exhaust 5 piping connection of two-way electromagnetic valve, eliminate exhaust noise.
As shown in Figure 2: original state, adjustment ring are in start position, exhaust two-way electromagnetic valve 5, inflation two-way electromagnetic valve
10 close, and proportional pressure-reducing valve 3 will be by the gas test pressure medium stable regulation of pressure regulator valve 2 to initial pressure value, it is ensured that supplies
Gas source should be stablized.
When starting test, inflation two-way electromagnetic valve 10 is opened, and gas source 1 is persistently pumped into gas to adjustment ring control piper 11
Test(ing) medium；One constant-speed ratio precise pressure regulation is pressed by proportional pressure-reducing valve 3 by the gas test medium of pressure regulator valve 2；Subtracted by ratio
The gas test medium that pressure valve 3 exports persistently is pressurized through booster 4 to gas tank 7；Gas test medium is through gas tank 7, gas
Flowmeter 8, pressure sensor 9 inflate two-way electromagnetic valve 10, fill to the adjustment ring control piper 11 that experimental test object variable pumps
Gas.
It is as shown in Figure 3: when acting in adjustment ring 15 atmospheric pressure and being greater than adjustment ring spring 12 to its supporting force, adjustment ring
Start to rotate forward around pin shaft 17, until adjustment ring stops operating in final position；Then proportional pressure-reducing valve 3 reduces control pipe
Road air pressure acts on adjustment ring 15 when atmospheric pressure is less than adjustment ring spring 12 to its supporting force in adjustment ring 15 and inversely returns, directly
It stops operating to adjustment ring, reaches reduction point；In the process, the displacement sensor 14 being in close contact with adjustment ring 15 is examined simultaneously
The displacement data that adjustment ring rotates forward stroke Yu backwards rotation stroke whole process is surveyed and acquires, if adjustment ring rotates forward
Stroke it is equal with the standard value set and with backwards rotation travel displacement difference as zero, adjustment ring 15 works well, otherwise not
Normally.
It can determine whether additionally by the blowing pressure maximum value there are catching phenomenon, the gas examination that pressure sensor 9 detects
It tests pressure medium value and illustrates that adjustment ring 15 is working properly within the upper and lower limits of setting；Otherwise adjustment ring work is abnormal；
Test(ing) medium pressure value is more than upper range, and there are clamping stagnations for test object variable pump adjustment ring 15；Test(ing) medium pressure value is more than
Lower range, 12 rigidity of adjustment ring spring is incorrect or there are 12 neglected loadings of adjustment ring spring.
Gas flowmeter detection gas test(ing) medium flow illustrates adjustment ring 15, variable within the upper and lower limits of setting
The installation of each component of pump case 16 is correct, and the upper and lower limits beyond setting illustrate to lack part or External Shape ruler in installation process
It is very little overproof, realize mistake proofing on assembly line.
After adjustment ring 15 resets, inflation two-way electromagnetic valve 10 is closed, and exhaust two-way electromagnetic valve 5 is opened；In experimental rig
Gas test medium is by exhaust two-way electromagnetic valve exhaust, when the compressed air pressure value that pressure sensor 9 detects is lower than initial
When pressure value, exhaust two-way electromagnetic valve 5 is closed, and proportional pressure-reducing valve 3, which adjusts gas test pressure medium, to restore to initial pressure
Value, this wheel off-test, in case test next time；Ensure test repeatability precision.
Claims (7)
1. a kind of variable pump adjustment ring detects dry testing method；It is characterized by:
The first step, displacement sensor gauge head are in close contact adjustment ring side；Original state, adjustment ring are in start position, displacement
Sensor initial displacement is set as zero；
Second step continues boost charge-air to adjustment ring control piper；It is greater than adjustment ring spring when acting on atmospheric pressure in adjustment ring
When to its supporting force, adjustment ring starts to rotate forward around pin shaft until adjustment ring stops operating, and adjustment ring is in final position；With
The displacement sensor gauge head that adjustment ring side is in close contact, which detects simultaneously and acquires adjustment ring, rotates forward displacement data；
Third step reduces control piper air pressure, acts on tune when atmospheric pressure is less than adjustment ring spring to its supporting force in adjustment ring
The domain inversely returns to reset, until adjustment ring stops operating, reaches reduction point；The displacement sensing being in close contact with adjustment ring side
Device gauge head detects and acquires the displacement data that adjustment ring is back to reduction point whole process around pin shaft backwards rotation simultaneously；
4th step, PLC calculate first step adjustment ring around pin shaft rotate forward stroke and and adjustment ring around pin shaft backwards rotation row
The shift differences of journey；
5th step, if adjustment ring around pin shaft rotate forward stroke it is equal with the standard value of setting and and adjustment ring it is inverse around pin shaft
It is zero to the shift differences of rotational travel, inflates maximum pressure value within the upper and lower limits of setting, adjustment ring works well；
If adjustment ring around pin shaft rotate forward stroke be less than setting standard value or and adjustment ring around pin shaft backwards rotation stroke
Shift differences are not zero, and adjustment ring has the not in place, clamping stagnation of operating or spare part outside measurement is overproof；Inflation maximum pressure value exceeds
Lower range, adjustment ring spring rate is incorrect or there are adjustment ring spring neglected loadings.
2. a kind of variable pump adjustment ring according to claim 1 detects dry testing method, it is characterised in that: gas flow
Detection gas test(ing) medium flow is counted within the upper and lower limits of setting, judges that each component installation of adjustment ring is correct；Beyond just
Normal range determines to lack part in installation process or spare part outside measurement is overproof.
3. realizing the device of the detection dry testing method of variable pump adjustment ring described in claim 1；It is characterized by comprising gas
Source, pressure regulator valve, proportional pressure-reducing valve, booster, exhaust two-way electromagnetic valve, gas tank, gas flowmeter, pressure sensor, inflation
Two-way electromagnetic valve, displacement sensor bracket, displacement sensor, electric control gear；Gas source, pressure regulator valve, proportional pressure-reducing valve, booster,
Exhaust two-way electromagnetic valve, gas tank, gas flowmeter, pressure sensor, inflation two-way electromagnetic valve are sequentially connected in series piping connection；It fills
Gas two-way electromagnetic valve is connected with test object variable pump adjustment ring control piper；The speed of proportional pressure-relief valve control pressurization, really
Protect the accurate and repeated of detection；Booster, gas tank ensure that moment provides the aeration quantity of enough increases in test；Exhaust two
Three-way electromagnetic valve is connected on the pipeline between gas tank and proportional pressure-reducing valve；Displacement sensor ontology is fixed on displacement sensor branch
On frame, displacement sensor gauge head is closely pressed against adjustment ring side, detects adjustment ring displacement data at any time；Electric control gear and gas
Flowmeter, pressure sensor, inflation two-way electromagnetic valve, exhaust two-way electromagnetic valve, displacement sensor electricly connect.
4. variable pump adjustment ring detects dry testing device according to claim 3；It is characterized by: original state, exhaust
Two-way electromagnetic valve, inflation two-way electromagnetic valve are closed；Proportional pressure-reducing valve will be stablized by the gas test pressure medium of pressure regulator valve to be adjusted
It saves to initial pressure value；When starting test, inflation two-way electromagnetic valve is opened, and gas source continues inflator pump to adjustment ring control piper
Enter gas test medium；One constant-speed ratio precise pressure regulation is pressed by proportional pressure-reducing valve by the gas test medium of pressure regulator valve；By than
The gas test medium of example pressure reducing valve output is persistently pressurized through booster to gas tank；Gas test medium is through gas tank, gas
The adjustment ring control piper inflation that flowmeter, pressure sensor, inflation two-way electromagnetic valve are pumped to experimental test object variable；As
With when atmospheric pressure is greater than adjustment ring spring to its supporting force in adjustment ring, adjustment ring starts to rotate forward around pin shaft until adjustment
Ring stops operating, and adjustment ring is in final position；Proportional pressure-reducing valve reduces control piper air pressure, acts on atmospheric pressure in adjustment ring
When less than adjustment ring spring to its supporting force, adjustment ring inversely returns to reset, until adjustment ring stops operating, reaches reduction point；
In the process, with adjustment ring be in close contact displacement sensor, while detect and acquire adjustment ring rotate forward stroke with it is inverse
To the displacement data of rotational travel whole process, if adjustment ring rotate forward stroke it is equal with the standard value of setting and with it is inverse
It is zero to rotational travel shift differences, adjustment ring works well, otherwise abnormal.
5. variable pump adjustment ring detects dry testing device according to claim 3；It is characterized by: most by the blowing pressure
Value can determine whether there are catching phenomenon greatly, bound model of the gas test pressure medium value that pressure sensor detects in setting
Within enclosing, illustrate that adjustment ring is working properly；Otherwise adjustment ring work is abnormal；Test(ing) medium pressure value is more than upper range, is surveyed
Trying object variable pump adjustment ring, there are clamping stagnations；Test(ing) medium pressure value be more than lower range, adjustment ring spring rate it is incorrect or
There are adjustment ring spring neglected loadings.
6. variable pump adjustment ring detects dry testing device according to claim 3；It is characterized by: gas flowmeter detects
Gas test rate-of flow illustrates that each component installation of adjustment ring, variable pump case is correct within the upper and lower limits of setting, surpasses
Upper and lower limits illustrate to lack part in installation process out or spare part outside measurement is overproof.
7. variable pump adjustment ring detects dry testing device according to claim 3；It is characterized by: when adjustment ring resets
Afterwards, inflation two-way electromagnetic valve is closed, and exhaust two-way electromagnetic valve is opened, and gas test medium is powered by exhaust two in experimental rig
Magnet valve exhaust；When the gas test pressure medium value of pressure sensor detection is lower than initial pressure value, it is vented two-way electromagnetic valve
It closes；Proportional pressure-reducing valve, which adjusts gas test pressure medium, to restore to initial pressure value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910613133.9A CN110261091B (en) | 2019-07-09 | 2019-07-09 | Variable pump dry test method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910613133.9A CN110261091B (en) | 2019-07-09 | 2019-07-09 | Variable pump dry test method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110261091A true CN110261091A (en) | 2019-09-20 |
| CN110261091B CN110261091B (en) | 2024-07-05 |
Family
ID=67925062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910613133.9A Active CN110261091B (en) | 2019-07-09 | 2019-07-09 | Variable pump dry test method and device |
Country Status (1)
| Country | Link |
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| CN (1) | CN110261091B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113740046A (en) * | 2021-09-08 | 2021-12-03 | 富奥汽车零部件股份有限公司 | Detection system and pipeline opening detection method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110261091B (en) | 2024-07-05 |
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