CN101520391B - Cavitation erosion test method of engine cooling system stand - Google Patents
Cavitation erosion test method of engine cooling system stand Download PDFInfo
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- CN101520391B CN101520391B CN200910132388XA CN200910132388A CN101520391B CN 101520391 B CN101520391 B CN 101520391B CN 200910132388X A CN200910132388X A CN 200910132388XA CN 200910132388 A CN200910132388 A CN 200910132388A CN 101520391 B CN101520391 B CN 101520391B
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- engine
- pressure
- cavitation erosion
- cooling system
- test method
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- 230000003628 erosive effect Effects 0.000 title claims abstract description 31
- 238000001816 cooling Methods 0.000 title claims abstract description 26
- 238000010998 test method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000110 cooling liquid Substances 0.000 claims abstract description 8
- 239000002826 coolant Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 8
- 238000013022 venting Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a cavitation erosion test method of an engine cooling system stand, which can conveniently, rapidly and accurately detect the cavitation erosion situation of an engine. The cavitation erosion test method of an engine cooling system stand is characterized in that an engine expansion tank or a pressure relief valve is provided with a gas relief port; cooling liquid is added to the lower limit of the expansion tank; the engine runs under the working conditions of maximum net power speed and full opening of a throttle, the temperature of the cooling liquid is controlled ina certain temperature range, the pressure of a cooling system is slowly reduced through gas relief, the flow rate of the cooling liquid is detected, when the flow rate of the cooling liquid is reduce d by 3 percent, the pressure which is the cavitation erosion pressure of the inlet of the water pump of the engine is recorded.
Description
Technical field
The present invention relates to a kind of cavitation erosion test method of engine cooling system stand.
Background technology
In the engine-cooling system exploitation, because of the centrifugal pumps that adopt, so at the beginning of exploitation, will consider whether the cavitation that exists in the cooling system can exert an influence to engine-cooling system more.A situation arises not have a kind of convenient, fast and accurate test method to detect cavitation erosion at present.
The mechanism of the notion of cavitation erosion and generation cavitation erosion: during the centrifugal pump running, fluid pressure descends along pump intake to impeller eye, near fluid pressure very low (pressure lowermost extent in the cooling system) blade inlet, after this since impeller to the fluid pressure work done, the very fast rising of fluid pressure, when near the pressure the impeller blade inlet during less than the saturated vapour pressure liquid delivery temperature (coolant temperature) under, liquid is just vaporized.The gas that is dissolved in the liquid is overflowed, they form numerous air-bubble, when bubble flows to leaf road internal pressure higher position with fluid, the fluid pressure of outside is higher than the gaseous tension in the bubble, then bubble condenses again to crumble and fall and forms the hole, liquid around in moment is brought to the hole with high speed, causes liquid to clash into mutually, and local pressure is increased suddenly.So not only hindered the liquid proper flow, particularly importantly, if these bubbles when the impeller wall is crumbled and fall, continuous strike metal surface, its collision frequency is very high, so the metal surface is because of the impact fatigue breakaway.(saturated vapor pressure: under the uniform temperature, be called saturated vapor pressure with the liquid or solid-state pressure that steam produced that is in equilibrium state of material of the same race, it increases with the rising of temperature.If) engine-cooling system design existence cavitation erosion defective, the impeller of water pump is under the corrosion of long-term cavitation erosion, and impeller can suffer to destroy can't operate as normal.Finally cause engine because of undesired damage of water pump water supply.
Summary of the invention
The object of the invention is to provide a kind of cavitation erosion test method of engine cooling system stand, can cavitation erosion convenient, fast, detection of engine exactly a situation arises.
Realize the object of the invention technical scheme:
A kind of cavitation erosion test method of engine cooling system stand, it is characterized in that: on engine expansion tank or pressure-release valve, relief port is set, add inject cooling liquid to the expansion tank lower limit, engine turns round in maximum net power rotating speed throttle wide operating mode, coolant temperature is controlled in the certain temperature range, slowly reduce cooling system pressure by exitting, detect coolant rate simultaneously, when coolant rate descends 3% the time, the pressure of record engine water pump porch this moment, this pressure is cavitation erosion pressure.
The beneficial effect that the present invention has:
The present invention slowly reduces cooling system pressure by venting, and under the constant situation of pump rotary speed, pump capacity descends, and illustrate that cavitation erosion has taken place the heat eliminating medium through water pump, the generation bubble.Find that according to test of many times flow descends below 3% situation, the destruction that water pump is not cavitated, so, be decided to be cavitation erosion pressure with the descend pressure of 3% o'clock corresponding engine water pump porch of coolant rate.The design of Cooling System target is that cooling system pressure is low more good more when wishing generation cavitation erosion situation, the regional the smaller the better of cavitation erosion takes place, we are easy to judge according to this test findings whether engine-cooling system exists the risk of cavitation erosion and improved the direction of target like this.Method of testing of the present invention is easy should go, and test accurately.
Embodiment
The place is provided with the coolant rate meter at the water inflow of the engine pipe, in order to detect coolant rate.In the engine water pump porch pressure unit and temperature sensor are set, in order to detected pressures and coolant temperature.
On engine expansion tank or pressure-release valve, relief port is set, add inject cooling liquid under the low temperature to the expansion tank lower limit, engine turns round in maximum net power rotating speed throttle wide operating mode, coolant temperature is controlled in 95 ℃ ± 2 ℃, under the stable situation of coolant rate, slowly reduces cooling system pressure by exitting, detect coolant rate simultaneously, when coolant rate descends 3% the time, the pressure of record engine water pump porch this moment, this pressure is cavitation erosion pressure.Write down under this temperature the test figure of the pressure of coolant rate and corresponding engine water pump porch.
Engine is stopped cold machine to normal temperature, add inject cooling liquid at low temperatures to the expansion tank lower limit, carrying out coolant temperature according to above test method is 100 ℃ ± 2 ℃, 105 ℃ ± 2 ℃, 110 ℃ ± 2 ℃, 115 ℃ ± 2 ℃, 120 ℃ ± 2 ℃, 125 ℃ ± 2 ℃ tests under the condition.
By the data analysis curve relation of pressure under a certain temperature and flow decline is found out, marked the spot pressure of flow decline 3%.Different temperature and corresponding cavitation erosion spot pressure are drawn out the cavitation erosion trend map.
Claims (5)
1. cavitation erosion test method of engine cooling system stand, it is characterized in that: on engine expansion tank or pressure-release valve, relief port is set, add inject cooling liquid to the expansion tank lower limit, engine turns round in maximum net power rotating speed throttle wide operating mode, coolant temperature is controlled in the certain temperature range, slowly reduce cooling system pressure by exitting, detect coolant rate simultaneously, when coolant rate descends 3% the time, the pressure of record engine water pump porch this moment, this pressure is cavitation erosion pressure.
2. cavitation erosion test method of engine cooling system stand according to claim 1 is characterized in that: the place is provided with the coolant rate meter at the water inflow of the engine pipe, in order to detect coolant rate.
3. cavitation erosion test method of engine cooling system stand according to claim 2 is characterized in that: in the engine water pump porch pressure unit and temperature sensor are set, in order to detected pressures and coolant temperature.
4. cavitation erosion test method of engine cooling system stand according to claim 3, it is characterized in that: liquid coolant is controlled at respectively in 95 ℃ ± 2 ℃, 100 ℃ ± 2 ℃, 105 ℃ ± 2 ℃, 110 ℃ ± 2 ℃, 115 ℃ ± 2 ℃, 120 ℃ ± 2 ℃, 125 ℃ ± 2 ℃ different temperature ranges, records cavitation erosion pressure that should temperature.
5. cavitation erosion test method of engine cooling system stand according to claim 4 is characterized in that: under the stable situation of coolant rate, venting slowly reduces cooling system pressure again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910132388XA CN101520391B (en) | 2009-04-01 | 2009-04-01 | Cavitation erosion test method of engine cooling system stand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910132388XA CN101520391B (en) | 2009-04-01 | 2009-04-01 | Cavitation erosion test method of engine cooling system stand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101520391A CN101520391A (en) | 2009-09-02 |
| CN101520391B true CN101520391B (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910132388XA Active CN101520391B (en) | 2009-04-01 | 2009-04-01 | Cavitation erosion test method of engine cooling system stand |
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| Country | Link |
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| CN (1) | CN101520391B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9255578B2 (en) * | 2012-07-31 | 2016-02-09 | Fisher-Rosemount Systems, Inc. | Systems and methods to monitor pump cavitation |
| CN112307596B (en) * | 2020-09-28 | 2023-02-28 | 东风汽车集团有限公司 | Cavitation erosion improvement method and device for engine oil pump of engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3236815A1 (en) * | 1982-10-05 | 1984-04-05 | Klaus Dipl.-Ing.(FH) 6831 Brühl Metzger | Monitoring and inspection device on pipelines for the transport of liquids for suppressing cavitation and improving the operating conditions |
| CN86101484A (en) * | 1985-03-14 | 1987-01-07 | 克劳斯·米茨格 | Methods of Controlling Cavitation |
| CN1501077A (en) * | 2002-11-13 | 2004-06-02 | 伊顿公司 | Method and apparatus of detecting the condition of a centrifugal pump |
-
2009
- 2009-04-01 CN CN200910132388XA patent/CN101520391B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3236815A1 (en) * | 1982-10-05 | 1984-04-05 | Klaus Dipl.-Ing.(FH) 6831 Brühl Metzger | Monitoring and inspection device on pipelines for the transport of liquids for suppressing cavitation and improving the operating conditions |
| CN86101484A (en) * | 1985-03-14 | 1987-01-07 | 克劳斯·米茨格 | Methods of Controlling Cavitation |
| CN1501077A (en) * | 2002-11-13 | 2004-06-02 | 伊顿公司 | Method and apparatus of detecting the condition of a centrifugal pump |
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|---|---|
| CN101520391A (en) | 2009-09-02 |
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Effective date of registration: 20190801 Address after: 241000 No. 8 Building, Science and Technology Industrial Park, 717 Zhongshan South Road, Yijiang District, Wuhu City, Anhui Province Patentee after: CHERY COMMERCIAL VEHICLES (ANHUI) CO., LTD. Address before: 241009 Wuhu economic and Technological Development Zone, Anhui, No. 8 Changchun Road Patentee before: Saic Chery Automobile Co., Ltd. |
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