CN114109842A - Experimental device for reproducing cavitation phenomenon of axial flow water pump - Google Patents
Experimental device for reproducing cavitation phenomenon of axial flow water pump Download PDFInfo
- Publication number
- CN114109842A CN114109842A CN202111266664.9A CN202111266664A CN114109842A CN 114109842 A CN114109842 A CN 114109842A CN 202111266664 A CN202111266664 A CN 202111266664A CN 114109842 A CN114109842 A CN 114109842A
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- Prior art keywords
- water pump
- shielding part
- gas
- flow water
- columns
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 230000003628 erosive effect Effects 0.000 claims abstract description 15
- 238000009423 ventilation Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 230000000306 recurrent effect Effects 0.000 claims 3
- 238000005273 aeration Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 49
- 238000000576 coating method Methods 0.000 abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/007—Details, component parts, or accessories especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D3/00—Axial-flow pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides an experimental device for reproducing a cavitation phenomenon of a water pump, and belongs to the technical field of axial flow water pump testing devices. The device mainly comprises a shielding part and an air conveying part, wherein the shielding part is arranged at the inlet end of the axial flow water pump, the height of the shielding part is 1/2-2/3 of the height of the inlet end of the water pump, the shielding part is formed by fastening two symmetrical semicircular rings through bolts, a plurality of ventilation columns with the same interval are arranged outside the shielding part, and the number of the ventilation columns is integral multiple of the impeller blades of the axial flow water pump; the gas transmission part comprises a cavity, a gas input column and a plurality of gas connecting columns, wherein the gas input column and the gas connecting columns are connected with the cavity; the gas input column is used for connecting an air pump or a nitrogen or gas cylinder. The invention can reproduce the cavitation phenomenon under the normal working state of the water pump and verify the cavitation erosion resistance of the coating.
Description
Technical Field
The invention belongs to the technical field of axial flow water pump testing devices.
Background
Cavitation is the main damage form of water pump and other hydraulic machinery flow passage components. The surface of the water pump blade is peeled off in a large area under the action of various factors such as cavitation, corrosion, rust and the like to form a honeycomb surface with bulges and holes, so that the service life of the pump is greatly shortened, the operation efficiency is reduced, the vibration is intensified, and the safe and reliable operation of the pump station is threatened.
The organic coating is coated on the surface of the flow passage component, which is a surface engineering technology for effectively improving the cavitation erosion resistance effect of the material, and has the advantages of low cost, simple construction, convenient coating repair, good cavitation erosion resistance effect, capability of effectively reducing the possibility of electrochemical corrosion of the base material in the cavitation erosion process, and the like. The organic coating is used for improving cavitation erosion protection of materials and is bound to occupy an important position in the future cavitation erosion resistant field.
At present, the cavitation erosion resistance research of the organic coating is only researched by an ultrasonic cavitation machine, but the mode is greatly different from the real water pump cavitation phenomenon.
Disclosure of Invention
Aiming at the problem, the invention provides an experimental device for reproducing the cavitation phenomenon of a water pump, which can reproduce the cavitation phenomenon under the normal working state of the water pump and verify the cavitation erosion resistance of a coating, and the technical scheme adopted by the invention is as follows:
an experimental device for reproducing cavitation of an axial-flow water pump mainly comprises a shielding part 1 and a gas transmission part 2,
the axial-flow water pump is characterized in that the shielding part 1 is arranged at the inlet end of the axial-flow water pump, the height of the shielding part 1 is 1/2-2/3 of the height of the inlet end of the water pump, the shielding part 1 is composed of two symmetrical semicircular rings 1-1 which are fastened through bolts 1-2, a plurality of ventilation columns 1-3 with the same interval are arranged outside the shielding part 1, the inner diameter of each ventilation column 1-3 is 10mm, and the number of the ventilation columns 1-3 is integral multiple of the impeller blades of the axial-flow water pump.
The gas transmission part 2 comprises a cavity 2-1, a gas input column 2-2 and a plurality of gas connecting columns 2-3, wherein the gas input column 2-2 and the gas connecting columns 2-3 are connected with the cavity 2-1, the gas connecting columns 2-3 correspond to the gas passing columns 1-3 of the shielding part 1 one by one, the inner diameter of the gas connecting columns is 10mm, and the gas connecting columns are connected with the gas passing columns 1-3 of the shielding part 1 through hoses; the gas input column 2-2 is used for connecting an air pump or a nitrogen or gas cylinder so as to satisfy the condition of manually reproducing cavitation erosion.
The experimental device can also only comprise the shielding part 1, and the air through column 1-3 of the shielding part is connected by a hose to directly extract air from the atmosphere without additionally providing an air pump.
The experimental method comprises the following steps: the shielding part 1 in the device is installed at the inlet end of the water pump, then the shielding part 1 is connected with the gas connecting column of the gas transmission part 2 through a hose, the gas pump is connected with the gas input column of the gas transmission part 2, the gas pump is started, then the water pump is placed below the horizontal plane, and the water pump is started to operate.
The invention has the beneficial effects that:
the experimental device can meet the requirement of carrying out experiments on different coatings coated on different impellers, and shortens the experimental period, so that the cavitation conditions and phenomena of different impellers keep consistency, and transverse comparison experiments can be effectively carried out.
Drawings
FIGS. 1 and 2 are schematic views showing the installation position of the shielding part according to the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
fig. 4 is a schematic view of a shielding portion structure.
Fig. 5 is a schematic structural view of the gas transmission part.
Detailed Description
The technical solution of the invention is further explained and illustrated in the form of specific embodiments.
Example 1
The experimental device for reproducing the cavitation erosion phenomenon of the axial flow water pump in the embodiment mainly comprises a shielding part 1 and a gas transmission part 2;
the axial-flow water pump is characterized in that the shielding part 1 is arranged at the inlet end of the axial-flow water pump, the height of the shielding part 1 is 1/2-2/3 of the height of the inlet end of the water pump, the shielding part 1 is composed of two symmetrical semicircular rings 1-1 which are fastened through bolts 1-2, a plurality of ventilation columns 1-3 with the same interval are arranged outside the shielding part 1, the inner diameter of each ventilation column 1-3 is 10mm, and the number of the ventilation columns 1-3 is integral multiple of the impeller blades of the axial-flow water pump.
According to the technical scheme, the cavitation phenomenon is generated according to the second principle, namely, the inlet resistance is increased, so that the vacuum degree of the inlet section of the water pump impeller is increased, and the cavitation phenomenon is generated, and therefore the height of the shielding part 1 needs to be set to be 1/2-2/3 of the inlet end height of the water pump, so that the cavitation phenomenon can be generated; in addition, if the water pump is deep according to the height, even if the height of the shielding part 1 is set to be high enough, the cavitation phenomenon cannot be reproduced, because the technical scheme adopts the mode of inputting gas from the outside and the like, the shielding part is broken near the impeller, and the cavitation phenomenon is generated manually. The technical scheme requires that the number of the ventilation columns is integral multiple of the impeller blades, and the experimental device can meet the requirement that different impellers are coated with different coatings for experiment, so that the experimental period is shortened, the cavitation conditions and phenomena of different impellers are kept consistent, and the transverse comparison experiment can be effectively carried out.
The gas transmission part 2 comprises a cavity 2-1, a gas input column 2-2 and a plurality of gas connecting columns 2-3, wherein the gas input column 2-2 and the gas connecting columns 2-3 are connected with the cavity 2-1, the gas connecting columns 2-3 correspond to the gas passing columns 1-3 of the shielding part 1 one by one, the inner diameter of the gas connecting columns is 10mm, and the gas connecting columns are connected with the gas passing columns 1-3 of the shielding part 1 through hoses; the gas input column 2-2 is used for connecting an air pump or a nitrogen or gas cylinder so as to satisfy the condition of manually reproducing cavitation erosion.
The purpose of the cavity 2-1 is to supply gas to the gas connection column 2-3 uniformly.
The experimental method comprises the following steps: the shielding part 1 in the device is installed at the inlet end of the water pump, then the shielding part 1 is connected with the gas connecting column of the gas transmission part 2 through a hose, the gas pump is connected with the gas input column of the gas transmission part 2, the gas pump is started, then the water pump is placed below the horizontal plane, and the water pump is started to operate.
Example 2
The experimental device can also only comprise the shielding part 1, and the air through column 1-3 of the shielding part is connected by a hose to directly extract air from the atmosphere without additionally providing an air pump.
Claims (5)
1. An experimental device for reproducing cavitation erosion phenomenon of an axial flow water pump is characterized by mainly comprising a shielding part (1) and a gas transmission part (2),
the axial-flow water pump is characterized in that the shielding part (1) is arranged at the inlet end of the axial-flow water pump, the height of the shielding part (1) is 1/2-2/3 of the height of the inlet end of the water pump, the shielding part (1) is formed by fastening two symmetrical semicircular rings (1-1) through bolts (1-2), a plurality of ventilation columns (1-3) with the same interval are arranged outside the shielding part (1), and the number of the ventilation columns (1-3) is integral multiple of the impeller blades of the axial-flow water pump;
the gas transmission part (2) comprises a cavity (2-1), and a gas input column (2-2) and a plurality of gas connecting columns (2-3) which are connected with the cavity (2-1), wherein the gas connecting columns (2-3) correspond to the gas passing columns (1-3) of the shielding part (1) one by one and are connected with the gas passing columns (1-3) of the shielding part (1) through hoses; the gas input column (2-2) is used for connecting an air pump or a gas cylinder.
2. A recurrent axial flow water pump cavitation erosion experimental apparatus as claimed in claim 1, wherein the inner diameter of the aeration column (1-3) is 10 mm.
3. A recurrent axial flow water pump cavitation erosion experimental apparatus as claimed in claim 2, characterized in that the inner diameter of the gas connection column (2-3) is 10 mm.
4. The experimental device for reproducing the cavitation phenomenon of the axial-flow water pump is characterized by comprising a shielding part (1), wherein the shielding part (1) is arranged at the inlet end of the axial-flow water pump, the height of the shielding part (1) is 1/2-2/3 of the height of the inlet end of the water pump, the shielding part (1) is formed by fastening two symmetrical semicircular rings (1-1) through bolts (1-2), a plurality of ventilation columns (1-3) with the same interval are arranged outside the shielding part (1), and the number of the ventilation columns (1-3) is integral multiple of the impeller blades of the axial-flow water pump; the ventilation columns (1-3) are connected with the atmosphere through hoses.
5. A recurrent axial flow water pump cavitation erosion experimental apparatus as claimed in claim 4, wherein the inner diameter of the aeration column (1-3) is 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111266664.9A CN114109842A (en) | 2021-10-28 | 2021-10-28 | Experimental device for reproducing cavitation phenomenon of axial flow water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111266664.9A CN114109842A (en) | 2021-10-28 | 2021-10-28 | Experimental device for reproducing cavitation phenomenon of axial flow water pump |
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| Publication Number | Publication Date |
|---|---|
| CN114109842A true CN114109842A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111266664.9A Pending CN114109842A (en) | 2021-10-28 | 2021-10-28 | Experimental device for reproducing cavitation phenomenon of axial flow water pump |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040213677A1 (en) * | 2003-04-24 | 2004-10-28 | Matzner Mark D. | Monitoring system for reciprocating pumps |
| CN101545481A (en) * | 2009-05-07 | 2009-09-30 | 武汉大学 | Multifunctional pump system test bed and control method thereof |
| CN202166579U (en) * | 2011-07-28 | 2012-03-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Device for measuring cavitation erosion and abrasion prevention performance and critical non-corrosion aerification concentration of materials |
| CN109724891A (en) * | 2019-01-17 | 2019-05-07 | 江苏大学镇江流体工程装备技术研究院 | A kind of Turo pump cavitation test device |
| CN111458244A (en) * | 2019-12-17 | 2020-07-28 | 国网四川省电力公司映秀湾水力发电总厂 | Mixed-flow water turbine blade wing type abrasion test device |
-
2021
- 2021-10-28 CN CN202111266664.9A patent/CN114109842A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040213677A1 (en) * | 2003-04-24 | 2004-10-28 | Matzner Mark D. | Monitoring system for reciprocating pumps |
| CN101545481A (en) * | 2009-05-07 | 2009-09-30 | 武汉大学 | Multifunctional pump system test bed and control method thereof |
| CN202166579U (en) * | 2011-07-28 | 2012-03-14 | 水利部交通运输部国家能源局南京水利科学研究院 | Device for measuring cavitation erosion and abrasion prevention performance and critical non-corrosion aerification concentration of materials |
| CN109724891A (en) * | 2019-01-17 | 2019-05-07 | 江苏大学镇江流体工程装备技术研究院 | A kind of Turo pump cavitation test device |
| CN111458244A (en) * | 2019-12-17 | 2020-07-28 | 国网四川省电力公司映秀湾水力发电总厂 | Mixed-flow water turbine blade wing type abrasion test device |
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