CN114738297A - Novel cavitation test system for intelligent open-loop centrifugal pump - Google Patents
Novel cavitation test system for intelligent open-loop centrifugal pump Download PDFInfo
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- CN114738297A CN114738297A CN202210533856.XA CN202210533856A CN114738297A CN 114738297 A CN114738297 A CN 114738297A CN 202210533856 A CN202210533856 A CN 202210533856A CN 114738297 A CN114738297 A CN 114738297A
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 238000005191 phase separation Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims 1
- 238000007872 degassing Methods 0.000 abstract 1
- 230000003628 erosive effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a novel intelligent open loop centrifugal pump cavitation test system, which belongs to the technical field of centrifugal pump tests and adopts the technical scheme that: the device comprises a gas-liquid two-phase separation tank, wherein the lower end of the gas-liquid two-phase separation tank is connected with a tested pump through a suction pipeline; the suction pipeline is provided with an inlet pressure sensor and an inlet regulating valve. An outlet pressure sensor, a rotating speed sensor, an electromagnetic flowmeter and an electric regulating valve are arranged on the suction pipeline. The inlet and outlet pressure sensors and the electromagnetic flow meter are connected with the data acquisition system, the electric regulating valve and the inlet regulating valve are connected with the automatic control system, the automatic control system automatically judges whether the lift is stable or not, and the flow is accurately controlled to be constant through a feedback closed loop and automatically acquires pressure, flow and other data. According to the invention, the degassing device is added before the tested pump, so that the harm of inaccurate test caused by the fact that the valve generates cavitation in advance is reduced, the test precision of the open type cavitation test is improved, and the workload of a tester is reduced.
Description
Technical Field
The invention belongs to the technical field of centrifugal pump testing, and particularly relates to a novel intelligent open-loop centrifugal pump cavitation testing system.
Background
The cavitation test of the pump, namely obtain the corresponding cavitation surplus value when the pump will be cavitated by the experimental method, refer to this cavitation surplus as the critical cavitation surplus value. The centrifugal pump cavitation test is mainly divided into an open loop and a closed loop; the closed loop test has high precision, but the operation is complex and the manufacturing cost is high; the open loop is simple to install, but is greatly interfered by the valve, cavitation is easily generated at the valve in advance, and fluctuation is large during data acquisition.
The open cavitation test is a test in which the pump is cavitated by reducing the inlet pressure by changing the opening degree of an inlet valve, but according to the conventional test process and results, when the opening degree of the valve is changed, the pressure is reduced and the flow rate is also reduced; need keep the invariant of flow in the testing process, when valve aperture changed simultaneously, the velocity of flow grow, and the liquid of valve department of flowing through has the vapor bubble to produce, takes place the cavitation in advance in valve department, has unstable condition during the data acquisition, after the lift often descends, has crossed very long time and can rise, causes the inaccuracy of test result, to above problem, open system does not have closed system at present and uses extensively, so the test accuracy on open circuit still remains to be improved at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a novel intelligent open-loop centrifugal pump cavitation test system.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the device comprises a gas-liquid two-phase separation tank for improving the flowing state of fluid, wherein the lower end of the gas-liquid two-phase separation tank is connected with a tested pump through a suction pipeline; the suction pipeline is sequentially provided with an inlet regulating valve, a gas-liquid two-phase separation tank and an inlet pressure sensor along the water flow direction; an outlet pressure sensor, a rotating speed sensor, an electromagnetic flowmeter and an electric regulating valve are sequentially arranged on an aspiration pipeline of the tested pump;
the inlet pressure sensor, the outlet pressure sensor, the rotating speed sensor and the electromagnetic flowmeter are all connected with a data acquisition system; the electric regulating valve and the inlet regulating valve are connected with an automatic control system, the automatic control system automatically judges whether the lift is stable or not, and the flow is accurately controlled through a feedback closed loop to keep constant and automatically acquire pressure and flow data.
The invention has the beneficial effects that:
1. the open loop has the biggest defect of being interfered by a valve too much, the gas-liquid two-phase separation tank is added to reduce the harm caused by inaccurate experimental results due to the fact that cavitation erosion occurs at the valve in advance, in the prior art, the other method for solving the problem of valve interference is to change the valve structure, but any valve can generate cavitation when the opening degree is changed, bubbles are generated, the interference is large, and therefore the problem of inaccurate experiment due to the fact that cavitation erosion occurs at the valve in advance can be better solved by adding the gas-liquid two-phase separation tank.
2. According to the novel intelligent open-loop centrifugal pump cavitation test system, the gas-liquid two-phase separation tank is added in front of the suction inlet of the pump, the inner cylinder of the tank is not of a common cylindrical structure but of a round platform structure with a wide upper part and a narrow lower part, and the upper end of the inner cylinder is designed in an arc shape, so that a new innovation is performed, the flowing state of fluid is improved, the stability is higher, and the precision of a cavitation test is improved.
3. The testing method of the invention combines the automatic control theory, accurately controls the flow stability through a closed loop, and compared with other open loop systems, the method additionally judges the stability of the lift, the open test has the problem of large data fluctuation, sometimes the lift looks stable, but rises again after a period of time, if the data is collected too early, the finally measured cavitation erosion allowance has deviation, the automatic control system improves the requirement for the collection of the lift data, and when the fluctuation range of the lift data is less than one percent for five times continuously, the lift data can be collected.
Drawings
Fig. 1 is a schematic front view of a gas-liquid two-phase separation tank, in which: 1. an exhaust port, 2, a sewage discharge outlet, 3, an inner cylinder, 4, a tank body, 5, a water inlet pipe and 6, a water outlet pipe;
FIG. 2 is a schematic diagram of the test system of the present invention, wherein: 7. the system comprises a water pool, 8 an inlet adjusting valve, 9 a gas-liquid two-phase separating tank, 10 an inlet pressure sensor, 11 a tested pump, 12 a rotating speed sensor, 13 an outlet pressure sensor, 14 an electromagnetic flowmeter, 15 an electric adjusting valve, 16 a data acquisition system and 17 an automatic control system.
Detailed Description
In an exemplary embodiment of the present invention, as shown in fig. 2, the test system includes a water tank 7, an inlet regulating valve 8, a gas-liquid two-phase separation tank 9, an inlet pressure sensor 10, a pump under test 11, a rotational speed sensor 12, an outlet pressure sensor 13, an electromagnetic flow meter 14, and an electric regulating valve 15.
As shown in fig. 1, a sewage draining outlet 2 is arranged at the bottom of a gas-liquid two-phase separation tank 9, and the sewage draining outlet 2 is used for draining impurities accumulated for a long time; the tank top has gas vent 1, and the exhaust hole is used for the bubble of discharge aquatic.
One side of the lower end of the gas-liquid two-phase separation tank 9 is provided with a water inlet pipe 5 connected with an inlet adjusting valve 8, and the inlet adjusting valve is used for adjusting the opening of an inlet valve so as to reduce the inlet pressure; the other side is provided with a water outlet pipe 6 connected with a tested pump 11, and an inlet pressure sensor 10 is arranged in front of an inlet pipeline of the tested pump 11 and used for measuring the pressure of the inlet of the pump; an outlet pressure sensor is arranged on an outlet pipeline of the tested pump 11 and used for measuring the pressure of the outlet of the pump. An electromagnetic flow meter 14 is also arranged on the outlet pipeline and is used for measuring the flow; an electrically operated regulating valve 15 is provided for regulating the flow rate.
The inside of gas-liquid two-phase knockout drum 9 is equipped with inner tube 3, inner tube 3 adopts narrow round platform structure from top to bottom, compare the cylinder structure of same width from top to bottom, the impact force when the design can be to the liquid outflow inner tube produces a cushioning effect, the speed is bigger when the pipeline for the fluid, the speed reduces when getting into the inner tube, along with the slow accumulation of water, the outflow inner tube that can be gentler, the upper end exit edge of inside adopts the arc design, curved design also can produce the buffering to rivers, liquid is when flowing like this, can not cause very big liquid to splash. After liquid enters the inner cylinder, the speed is reduced, liquid gradually rises by utilizing the density difference between bubbles and the liquid, the liquid flows out of the inner cylinder, the bubbles continuously rise and are discharged through the exhaust holes, gas-liquid separation is realized, meanwhile, the flow rate of the liquid can be stabilized, the flow state of the liquid is improved, and the flow rate of the liquid entering the pump is more stable.
As further technical scheme, through the stability of feedback system control flow, automatic control system can judge automatically whether the lift is stable simultaneously, and the system can automatic recording each parameter data under this operating mode point when the lift is stable, and concrete test procedure is as follows:
1) checking the air tightness of the whole system to ensure that each pipeline is air-tight;
2) carrying out tests according to the sequence of the small-flow working condition points, the design working condition points and the large-flow working condition points;
3) starting a tested pump, adjusting the flow to a small-flow working condition point, and collecting initial data, inlet and outlet pressure, atmospheric pressure, rotating speed, flow and the like by a system;
4) the inlet throttle valve is adjusted, so that the pressure of the inlet of the pump is changed, when the flow falls to a value beyond a specified range, the automatic control system can realize the closed-loop accurate control of the position and the opening of the electric control valve, the flow is adjusted to a specified range, the lift is calculated in real time by the computer according to the pressure difference between the inlet and the outlet, the system records data every 5S, when the fluctuation range error of the five-time lift data is within one percent, the lift is considered to be stable and cannot rise back, the computer automatically collects the data, and when the lift falls to three percent, the cavitation test of a low-flow working condition point is completed.
5) And (4) designing a working condition point and a large-flow working condition point, repeating the steps, and drawing a flow-cavitation allowance, lift-cavitation allowance curve chart after finishing the steps.
Claims (5)
1. A novel intelligent open-loop centrifugal pump cavitation test system is characterized by comprising a gas-liquid two-phase separation tank for improving the flowing state of fluid, wherein the lower end of the gas-liquid two-phase separation tank is connected with a tested pump through a suction pipeline; the suction pipeline is sequentially provided with an inlet regulating valve, a gas-liquid two-phase separation tank and an inlet pressure sensor along the water flow direction; an outlet pressure sensor, a rotating speed sensor, an electromagnetic flowmeter and an electric regulating valve are sequentially arranged on an aspiration pipeline of the tested pump;
the inlet pressure sensor, the outlet pressure sensor, the rotating speed sensor and the electromagnetic flowmeter are all connected with a data acquisition system; the electric regulating valve and the inlet regulating valve are connected with the automatic control system, the automatic control system automatically judges whether the lift is stable or not, and the flow is accurately controlled through the feedback closed loop to keep constant and automatically acquire pressure and flow data.
2. The system for testing cavitation of the novel intelligent open-loop centrifugal pump according to claim 1, wherein a sewage draining outlet is formed in the bottom of the gas-liquid two-phase separation tank, an air outlet is formed in the top of the gas-liquid two-phase separation tank, and the inner cylinder is integrally of a structure with a wide upper part and a narrow lower part.
3. The system of claim 2 wherein the upper outlet edge of the inner barrel is of arcuate design.
4. The system for testing cavitation of the novel intelligent open-circuit centrifugal pump according to claim 1, wherein the automatic control system realizes closed-loop precise control of the position and the opening of the electric control valve, the flow is adjusted to a specified range, meanwhile, the automatic control system automatically judges whether the lift is stable, and when the lift is stable, the system automatically records each parameter data under the operating point.
5. The new intelligent open-loop centrifugal pump cavitation test system of claim 4,
when the opening degree of the inlet regulating valve is gradually reduced, the inlet pressure of the tested pump is also gradually reduced, the data acquisition system automatically acquires pressure and flow and calculates head data in real time, and in the process, the flow is kept in a certain range;
when the flow value is reduced to be out of the designated range, the automatic control system realizes the closed-loop accurate control of the flow by adjusting the electric regulating valve, and keeps the flow stable; the system records data every five seconds, and when the five continuous head data are stabilized in the error of less than one percent, the data are considered to be stable; and then adjusting the inlet adjusting valve, and repeating the steps until the lift is reduced by three percent, thereby completing the measurement of one working condition point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210533856.XA CN114738297A (en) | 2022-05-17 | 2022-05-17 | Novel cavitation test system for intelligent open-loop centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210533856.XA CN114738297A (en) | 2022-05-17 | 2022-05-17 | Novel cavitation test system for intelligent open-loop centrifugal pump |
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| CN114738297A true CN114738297A (en) | 2022-07-12 |
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| CN202210533856.XA Pending CN114738297A (en) | 2022-05-17 | 2022-05-17 | Novel cavitation test system for intelligent open-loop centrifugal pump |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034412A (en) * | 1988-04-27 | 1989-08-02 | 沈阳水泵厂 | Regulator for cavitation test of pump |
| CN103121734A (en) * | 2013-03-19 | 2013-05-29 | 湖南中科富邦科技有限责任公司 | Cyclone gas flotation separator |
| CN106368960A (en) * | 2016-10-27 | 2017-02-01 | 广东肯富来泵业股份有限公司 | Device and method for detecting critical cavitation point of centrifugal pump |
| CN108825521A (en) * | 2018-05-10 | 2018-11-16 | 榆林学院 | A kind of testing stand pumping external characteristics and interior flow field performance test for being centrifuged viscous oil |
| CN208153312U (en) * | 2018-04-24 | 2018-11-27 | 无锡太博泵业有限公司 | A kind of water pump test macro |
| CN209743128U (en) * | 2018-09-17 | 2019-12-06 | 山东挚刚智能控制机械有限公司 | Automatic testing device for improving testing precision of water pump |
| US20220196513A1 (en) * | 2020-06-24 | 2022-06-23 | Wuhan University Of Technology | Test device and method for automatic pressure regulating valve of electronic braking system |
-
2022
- 2022-05-17 CN CN202210533856.XA patent/CN114738297A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1034412A (en) * | 1988-04-27 | 1989-08-02 | 沈阳水泵厂 | Regulator for cavitation test of pump |
| CN103121734A (en) * | 2013-03-19 | 2013-05-29 | 湖南中科富邦科技有限责任公司 | Cyclone gas flotation separator |
| CN106368960A (en) * | 2016-10-27 | 2017-02-01 | 广东肯富来泵业股份有限公司 | Device and method for detecting critical cavitation point of centrifugal pump |
| CN208153312U (en) * | 2018-04-24 | 2018-11-27 | 无锡太博泵业有限公司 | A kind of water pump test macro |
| CN108825521A (en) * | 2018-05-10 | 2018-11-16 | 榆林学院 | A kind of testing stand pumping external characteristics and interior flow field performance test for being centrifuged viscous oil |
| CN209743128U (en) * | 2018-09-17 | 2019-12-06 | 山东挚刚智能控制机械有限公司 | Automatic testing device for improving testing precision of water pump |
| US20220196513A1 (en) * | 2020-06-24 | 2022-06-23 | Wuhan University Of Technology | Test device and method for automatic pressure regulating valve of electronic braking system |
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