CN114857038B - Experimental table for reproducing cavitation phenomenon of axial flow water pump - Google Patents
Experimental table for reproducing cavitation phenomenon of axial flow water pump Download PDFInfo
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- CN114857038B CN114857038B CN202210465402.3A CN202210465402A CN114857038B CN 114857038 B CN114857038 B CN 114857038B CN 202210465402 A CN202210465402 A CN 202210465402A CN 114857038 B CN114857038 B CN 114857038B
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- water pump
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- connector
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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
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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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
- 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 belongs to the field of cavitation erosion resistance test equipment, and discloses a recurrent axial flow water pump cavitation phenomenon experiment table which comprises a lifting frame and a support frame, wherein the lifting frame is connected with a motor, a horizontal slideway, a steel rope and a connector, the support frame is connected with the connector through a conical support, the support frame can horizontally move through the driving of a micro motor on the motor, the connector and the support frame are driven to vertically move through the rotation of the motor and the winding of the steel rope, the automatic height adjustment is further realized through a wireless pressure sensor, the lifting of the support frame can be automatically controlled under the condition that the water pump is in a real sea environment and the rising tide and falling tide continuously occur, so that the water pump is maintained at a proper height, the quick disassembly and installation of the support frame can be realized through the matching of a telescopic block arranged on the connector and the conical support on the support frame, and a fastening plate arranged on a round bar of the support frame and a pump bottom groove are used for fixing the water pump, and therefore, the recurrent axial flow water pump cavitation phenomenon experiment table has the characteristics of safety and reliability.
Description
Technical Field
The invention belongs to the field of cavitation erosion resistance test equipment.
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. In order to solve the problem, the cavitation erosion of the water pump under the real working condition needs to be reproduced to verify the effectiveness of the coating. The mode of reproducing the real water pump needs a set of test bed which can be automatically lifted, quickly disassembled, safe and reliable, but the test bed belongs to a blank in the field at present.
Disclosure of Invention
In order to solve the problems, the invention provides an experimental bench for reproducing the cavitation erosion phenomenon of an axial flow water pump, which adopts the following technical scheme:
an experimental bench for reproducing cavitation of axial-flow water pump, which mainly comprises a lifting frame 1 and a supporting frame 7,
the lifting frame 1 is fixedly provided with two parallel horizontal slideways 2, the motor 2 is connected with a pulley embedded in the horizontal slideways 2, and the pulley is driven by a micro motor 4 fixed on the motor 2 to realize the horizontal movement of the motor 2; simultaneously motor 2 links to each other with the one end of steel cable 5, and the steel cable 5 other end links to each other with 6 upper ends of connector, and through motor 2 rotation, steel cable 5 can freely twine, and the rotation through steel cable 5 makes connector 6 lift, and connector 6 links to each other with support frame 7 that is used for fixed water pump, realizes the removal of vertical direction under the drive of connector 6.
A wireless pressure sensor 14 is arranged below the support frame 7, the sensor transmits a pressure signal to the control system, when the pressure signal is greater than a set threshold value, the control system drives the motor 2 to operate to lift the support frame 7, and when the pressure signal is less than the set threshold value, the control system drives the motor 2 to operate to lower the support frame 7, so that the water pump is maintained at a proper height.
The horizontal length of the horizontal slideway 2 is 1-100 m, and the length of the steel rope 5 is 1-100 m.
If the conical support 8 is separated from the connector 6, the telescopic block 13 is only required to be extruded inwards, the telescopic block 13 is extruded into the connector 6, the separation is realized by upwards stretching the steel rope 5, and when the telescopic block 13 is not subjected to external force, the internal spring automatically bounces, so that the telescopic block 13 returns to the initial position. If want to be connected connector 6 and tapered support 8 once more, only need free fall steel cable 5, flexible piece 13 can receive the pressure that comes from tapered support 8 inside wall in the in-process that falls, and automatic the contracting is received, when flexible piece 13 is whole to be exposed, and the atress is no longer at this moment, and flexible piece 13 gets back to original position again, has realized linking to each other.
Be fixed with twice horizontally round bar 9 on the support frame 7, 8 below are equipped with two mounting plates 10 in the support of tapered shape, and two mounting plates 10 cover is on the twice round bar 9 on the support frame 7, can freely slide on round bar 9, use the bolt fastening between two mounting plates 10, can be according to the diameter of water pump to carrying out bolt length adjustment, through the bolt with water pump and mounting plate 10 zonulae occludens together, prevent that the water pump from droing from support frame 7 because the vibration is followed in the operation in-process.
The bottom of support frame 7 is equipped with water pump backup pad 11, is equipped with pump kerve 12 in the water pump backup pad 11, and this pump kerve 12 is used for placing the bottom of water pump, plays the effect of fastening water pump bottom.
The invention has the beneficial effects that:
the experiment table for the recurrent axial flow water pump cavitation phenomenon can automatically control the lifting of the supporting frame to enable the water pump to maintain a proper height under the condition that the water pump still generates rising tide and falling tide continuously in the real sea environment, on one hand, the problem that the cavitation erosion phenomenon disappears and effective cavitation erosion data cannot be obtained due to overlarge tidal water during rising tide and overlarge water pump inlet pressure can be avoided, and on the other hand, the risk that a water pump motor is burnt out due to serious cavitation erosion phenomenon caused by sharp reduction of the water pump inlet pressure during falling tide can be reduced.
The invention not only can rapidly adjust the horizontal and vertical positions of the axial flow water pump, but also is convenient to disassemble, and has the characteristics of safety and reliability.
The adjustable axial flow water pump can be adjusted and fixed according to the diameter of the water pump, and can be used for axial flow water pump experiments of various specifications.
Drawings
Fig. 1 shows a structure diagram of an experimental table for reproducing cavitation of an axial flow water pump.
Fig. 2 is an enlarged sectional view of the cone-shaped holder, the connector and the expansion block.
FIG. 3 is a control logic block diagram of the control system.
Detailed Description
The technical solution of the present invention is further explained and illustrated in the form of specific embodiments below.
The experimental bench for reproducing the cavitation erosion phenomenon of the axial flow water pump in the embodiment mainly comprises a lifting frame 1 and a supporting frame 7,
the lifting frame 1 is fixedly provided with two parallel horizontal slideways 2, the motor 2 is connected with a pulley embedded in the horizontal slideways 2, and the pulley is driven by a micro motor 4 fixed on the motor 2 to realize the horizontal movement of the motor 2; simultaneously motor 2 links to each other with the one end of steel cable 5, and the steel cable 5 other end links to each other with 6 upper ends of connector, and through motor 2 rotation, steel cable 5 can freely twine, makes connector 6 lift through the rotation of steel cable 5, and connector 6 links to each other with support frame 7 that is used for fixed water pump, realizes the altitude mixture control of test water pump under the drive of connector 6.
A wireless pressure sensor 14 is arranged below the support frame 7, the sensor transmits pressure signals to a control system, and the specific control logic of the control system is as follows:
1) Continuously adjusting the height of the support frame 7, recording the pressure value recorded by the wireless pressure sensor 14 when cavitation erosion occurs, setting the highest pressure at which cavitation erosion occurs as a high threshold value, and setting a low threshold value of the pressure according to the experimental condition on the premise of ensuring the safety of equipment;
2) In the experimental process, the pressure value obtained by the wireless pressure sensor 14 transmits a pressure signal to the control system;
3) Judging whether the pressure value is greater than or equal to a set low threshold value, if not, driving the motor 2 to run by the control system to put down the support frame 7, and if so, continuously judging whether the pressure value is greater than a high threshold value;
4) If the pressure value is larger than the set high threshold value, the control system drives the motor 2 to operate and lift the support frame 7; if the pressure value is less than or equal to the set high threshold value, the control system does not generate a lifting signal to the motor 2.
The water pump is maintained within a suitable height range by the control logic.
The horizontal length of the horizontal slideway 2 is 1-100 m, and the length of the steel rope 5 is 1-100 m.
If the conical support 8 is separated from the connector 6, the telescopic block 13 is only required to be extruded inwards, the telescopic block 13 is extruded into the connector 6, the separation is realized by upwards stretching the steel rope 5, and when the telescopic block 13 is not subjected to external force, the internal spring automatically bounces, so that the telescopic block 13 returns to the initial position. If want to connect connector 6 and tapered support 8 once more, only need free fall steel cable 5, flexible piece 13 can receive the pressure that comes from tapered support 8 inside wall in the in-process that falls, and automatic the contracting is withdrawn, when flexible piece 13 is whole to expose, no longer receives the force this moment, and flexible piece 13 gets back to original position again, has realized linking to each other.
Be fixed with twice horizontally round bar 9 on the support frame 7, the tapered holds in the palm 8 below and is equipped with two mounting plates 10, and two mounting plates 10 cover on the twice round bar 9 on the support frame 7, can freely slide on round bar 9, use the bolt fastening between two mounting plates 10, can be according to the diameter of water pump to carrying out bolt length adjustment, be in the same place water pump and mounting plate 10 zonulae occludens through the bolt, prevent that the water pump from droing from support frame 7 owing to the vibration at the operation in-process.
Claims (6)
1. A recurrent axial-flow water pump cavitation phenomenon experiment table is characterized in that the experiment table mainly comprises a lifting frame (1) and a supporting frame (7),
the lifting frame (1) is fixedly provided with two parallel horizontal slideways (3), the motor (2) is connected with a pulley embedded in the horizontal slideways (3), and the pulley is driven by a micro motor (4) fixed on the motor (2) to realize the horizontal movement of the motor (2); meanwhile, the motor (2) is connected with one end of the steel rope (5), the other end of the steel rope (5) is connected with the upper end of the connector (6), the steel rope (5) can be freely wound through the rotation of the motor (2), the connector (6) can be lifted through the rotation of the steel rope (5), the connector (6) is connected with a support frame (7) for fixing a water pump, and the vertical movement is realized under the driving of the connector (6);
a wireless pressure sensor (14) is arranged below the support frame (7), the sensor transmits a pressure signal to the control system, when the pressure signal is greater than a set threshold value, the control system drives the motor (2) to operate to lift the support frame (7), and when the pressure signal is less than the set threshold value, the control system drives the motor (2) to operate to lower the support frame (7), so that the water pump is maintained at a proper height.
2. The experiment table for reproducing the cavitation phenomenon of the axial flow water pump according to claim 1, wherein the specific control logic of the control system is as follows:
1) Continuously adjusting the height of the support frame (7), recording a pressure value recorded by the wireless pressure sensor (14) when cavitation erosion occurs, setting the highest pressure at which cavitation erosion occurs as a high threshold value, and setting a low threshold value on the premise of ensuring the safety of equipment;
2) In the experimental process, a pressure signal is transmitted to a control system by a pressure value acquired by a wireless pressure sensor (14);
3) Judging whether the pressure value is greater than or equal to a set low threshold value, if not, driving a motor (2) to rotate by a control system to put down a supporting frame (7), and if so, continuously judging whether the pressure value is greater than the high threshold value;
4) If the pressure value is larger than the set high threshold value, the control system drives the motor (2) to operate and lift the support frame (7); if the pressure value is less than or equal to the set high threshold value, the control system does not generate a lifting signal to the motor (2).
3. The reoccurring axial-flow water pump cavitation erosion phenomenon laboratory bench of claim 2, characterized in that, support frame (7) be the cage type structure, support frame (7) upper end is equipped with the toper type and holds in the palm (8), toper type holds in the palm (8) and is connected with connector (6) afterbody in the gallows (1), connector (6) afterbody and toper type hold in the palm (8) and adopt the same toper structure, connector (6) afterbody have a plurality of embedded flexible pieces (13) set up in toper type hold in the palm (8) lower terminal surface department, this flexible piece (13) are the bounce-off state under the unstressed condition, make connector (6) and toper type hold in the palm (8) zonulae occludens.
4. The recurrence axial flow water pump cavitation erosion phenomenon experiment table according to claim 2, characterized in that two horizontal round bars (9) are fixed on the support frame (7), two fastening plates (10) are arranged below the conical support (8), the two fastening plates (10) are sleeved on the two round bars (9) on the support frame (7) and can freely slide on the round bars (9), the two fastening plates (10) are fixed by bolts, the length of the bolts can be adjusted according to the diameter of the water pump, and the water pump and the fastening plates (10) are tightly connected together by the bolts.
5. A recurrent axial flow water pump cavitation erosion phenomenon experiment table according to claim 2, characterized in that a water pump support plate (11) is provided at the bottom of the support frame (7), a pump bottom groove (12) is provided on the water pump support plate (11), and the pump bottom groove (12) is used for placing the bottom of the water pump and plays a role of fastening the bottom of the water pump.
6. The experimental bench for recurrence of cavitation erosion phenomenon of axial-flow water pump according to claim 1, wherein the horizontal slide way (3) has a length of 1-100 m in horizontal direction, and the steel cable (5) has a length of 1-100 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210465402.3A CN114857038B (en) | 2022-04-26 | 2022-04-26 | Experimental table for reproducing cavitation phenomenon of axial flow water pump |
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| CN202210465402.3A CN114857038B (en) | 2022-04-26 | 2022-04-26 | Experimental table for reproducing cavitation phenomenon of axial flow water pump |
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| CN114857038A CN114857038A (en) | 2022-08-05 |
| CN114857038B true CN114857038B (en) | 2023-02-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3188697U (en) * | 2013-08-06 | 2014-02-06 | 篤 国府田 | Power generator |
| CN204511759U (en) * | 2015-04-03 | 2015-07-29 | 大连理工大学 | A kind of adjustable pendulum wave energy power generation |
| CN106287117A (en) * | 2016-08-22 | 2017-01-04 | 赵恕轲 | A kind of adjustable type pumping plant machine unit support |
| CN205958989U (en) * | 2016-07-22 | 2017-02-15 | 长沙学院 | Heterogeneous stream erosion cavitation corrosion and corruption comprehensive experiment platform data collection and control device |
| CN113137328A (en) * | 2021-04-21 | 2021-07-20 | 中国长江三峡集团有限公司 | Movable horizontal shaft tidal current energy water turbine energy increasing device and control method |
| CN113981928A (en) * | 2021-11-18 | 2022-01-28 | 宋有为 | Water surface garbage cleaning device |
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2022
- 2022-04-26 CN CN202210465402.3A patent/CN114857038B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3188697U (en) * | 2013-08-06 | 2014-02-06 | 篤 国府田 | Power generator |
| CN204511759U (en) * | 2015-04-03 | 2015-07-29 | 大连理工大学 | A kind of adjustable pendulum wave energy power generation |
| CN205958989U (en) * | 2016-07-22 | 2017-02-15 | 长沙学院 | Heterogeneous stream erosion cavitation corrosion and corruption comprehensive experiment platform data collection and control device |
| CN106287117A (en) * | 2016-08-22 | 2017-01-04 | 赵恕轲 | A kind of adjustable type pumping plant machine unit support |
| CN113137328A (en) * | 2021-04-21 | 2021-07-20 | 中国长江三峡集团有限公司 | Movable horizontal shaft tidal current energy water turbine energy increasing device and control method |
| CN113981928A (en) * | 2021-11-18 | 2022-01-28 | 宋有为 | Water surface garbage cleaning device |
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| CN114857038A (en) | 2022-08-05 |
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