CN106968934A - Pump cavitation surplus Auto-Test System and its method - Google Patents
Pump cavitation surplus Auto-Test System and its method Download PDFInfo
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- CN106968934A CN106968934A CN201710283136.1A CN201710283136A CN106968934A CN 106968934 A CN106968934 A CN 106968934A CN 201710283136 A CN201710283136 A CN 201710283136A CN 106968934 A CN106968934 A CN 106968934A
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- pump
- tank
- valve
- switch valve
- electric gate
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention discloses a kind of pump cavitation surplus Auto-Test System and its method, including：Electric gate valve, flowmeter, pneumatic control valve are installed on the flow adjustment pipe of drain tank, water tank and connection drain tank and water tank, the pipeline；Pumping tank on water tank；Vavuum pump and vavuum pump is connected with pumping tank, exhaust pipe and its bye-pass equipped with switch valve；The motor electrically connected with vavuum pump；Electric gate valve and pressure transmitter and the inlet pipeline connected with the water inlet of tested water pump are installed；Electric gate valve, pressure transmitter and switch valve are installed on the outlet pipeline connected with the delivery port of tested water pump, the pipeline；Be integrated with data acquisition module and data control block and the observing and controlling cabinet being connected by parts such as signal wire and foregoing electric gate valve, pressure transmitters, observing and controlling cabinet and be additionally provided with networking output interface, for the industrial computer communication equipped with test program.Energy of the invention is automatic, quickly and accurately test pump cavitation surplus.
Description
Technical field
The invention belongs to parallel water pump technical field, and in particular to a kind of pump cavitation surplus Auto-Test System and its side
Method.
Background technology
Pump cavitation surplus test be one of basic work of testing water pump, be water pump whole production procedure in
Important part.Water pump in the course of the work, often produces cavitation phenomenons, so that right because of fluid local pressure decline in pump
Pump part or even pump case have detrimental effect, and water pump cisco unity malfunction can be caused when serious, and the net positive suction head of pump is gone back at present
It can not be tried to achieve by theoretical calculation.
At present, pump cavitation experimental test gradually lowers pump mostly by adjusting the valve being arranged on inlet pipeline
Inlet pressure, while regulation is arranged on the valve on outlet pipeline, to keep flow constant, treats that lift decrease beyond 3%, then
Cavitation experiment terminates.Whole process of the test need to adjust two parameters of inlet pressure and flow simultaneously, and not only measurement error is big, efficiency
It is low, and tester's labor intensity is big.
The content of the invention
It is an object of the invention to overcome, the existing test error of existing pump cavitation experiment is big, efficiency is low and works
The big defect of intensity, so as to improve the precision and automaticity of test.In order to realize this purpose, the present invention proposes one kind
Pump cavitation surplus Auto-Test System, it includes components described below：
(1) pacify on the flow adjustment pipe of drain tank, water tank and connection drain tank and water tank, flow adjustment pipe
Equipped with electric gate valve, flowmeter, pneumatic control valve,
(2) it is arranged on the pumping tank on the water tank；
(3) switch valve is housed on vavuum pump and the exhaust pipe for connecting vavuum pump with the pumping tank, exhaust pipe,
It is additionally provided with exhaust pipe on a straight open to atmosphere bye-pass, bye-pass and is also equipped with switch valve；
(4) motor electrically connected with the vavuum pump；
(5) electric gate valve is installed on the inlet pipeline connected with the water inlet of tested water pump, inlet pipeline and pressure becomes
Send device；
(6) electric gate valve, pressure inverting are installed on the outlet pipeline connected with the delivery port of tested water pump, outlet pipeline
Device and switch valve；
(7) observing and controlling cabinet, it passes through signal wire and foregoing each electric gate valve, pressure transmitter, switch valve, flowmeter, pneumatic
Regulating valve is connected, and is integrated with data acquisition module and data control block, observing and controlling cabinet in observing and controlling cabinet and is additionally provided with network output and connects
Mouthful, for the industrial computer communication equipped with test program.
On the basis of above-mentioned technical proposal, the present invention can add following technological means, preferably to solve the present invention
Technical problem to be solved：
Switch valve is also associated with the pumping tank, it is to give pumping tank tonifying Qi that it, which is acted on,.
Further, temperature transmitter is also equipped with the water tank, for measuring the temperature of a liquid in real time.
It is engaged with above-mentioned pump cavitation surplus Auto-Test System, more than a kind of pump cavitation
The method of testing of amount, it comprises the steps：
Step one, industrial computer is according to performance test results, with fitting of a polynomial flow-lift curve Q-H, and will be whole bent
Line obtains Q-H along the translation 3% downwards of ordinate direction3Curve；
Step 2, the opening value that result gives pneumatic control valve is recorded according to performance test；
Step 3, after pump cavitation surplus test system is stable, starts vavuum pump；
Step 4, opens the switch valve on exhaust pipe, and the switch valve closed on bye-pass, vavuum pump comes into operation；
Step 5, continuous acquisition pressure transmitter, flowmeter, the signal of torque rotary speed sensor, and calculate raise in real time
Journey value Ha；
Step 6, industrial computer is according to Q-H3Curve representation formula and the actual flow value collected in real time, it is real-time by interpolation
Calculate corresponding lift determining reference value Ht；
Step 7, real time contrast HaAnd HtValue；
Step 8, works as Ha≤HtWhen, the switch valve closed on exhaust pipe opens the switch valve on bye-pass；
Step 9, opens the switch valve on pumping tank, and tonifying Qi is carried out to pumping tank, and tonifying Qi is closed after terminating on pumping tank
Switch valve；
Step 10, into next operating mode experimental tests, repeats the second to the 9th step, until all operating points have been tested
Finish；
Step 11, draws flow-net positive suction head Q-NPSH curves；
Step 12, substitutes into Q-NPSH curve representation formulas by one group of flow targets operating mode value to be measured, then can try to achieve one group
Net positive suction head value.
The present invention has following beneficial effects：
Integrated use of the invention based on computer technology, automatic control technology and sensor technology, can be automatic, fast
Speed, exactly test pump cavitation surplus, so as to drastically increase the testing efficiency and measuring accuracy of pump cavitation surplus, drop
The low labor intensity of tester, improves the working environment of tester.
Brief description of the drawings
Fig. 1 for the present invention in pump cavitation surplus test system structural representation；
Fig. 2 for the present invention in pump cavitation surplus method of testing flow chart；
Fig. 3 is the test result data processing figure in one embodiment of the present of invention；
Fig. 4 is the pump cavitation trial curve figure in one embodiment of the present of invention.
Embodiment
Two embodiments of the present invention are discussed in detail below in conjunction with accompanying drawing.
Embodiment 1
As shown in figure 1, a kind of pump cavitation surplus Auto-Test System, it includes components described below：
(1) drain tank 1, water tank 2 and the flow adjustment pipe 3 for connecting drain tank 1 with water tank 2, Flow-rate adjustment
Electric gate valve 301, flowmeter 302, pneumatic control valve 303 are sequentially installed with pipeline 3.The main function of electric gate valve 301 is,
When needing maintenance pipeline or instrument, for blocking the current in flow adjustment pipe 3.Flowmeter 302 is used to measure tested water
The flow of pump 10.Pneumatic control valve 303 is used to adjust the water-carrying capacity in flow adjustment pipe 3.Temperature is also equipped with water tank 2
Transmitter 201, for measuring the temperature of a liquid in real time.
(2) be arranged on the water tank 2 on pumping tank 4, pumping tank 4 on be also associated with switch valve 401, its act on be to
It is evacuated the tonifying Qi of tank 4.
(3) it is equipped with and opens on vavuum pump 5 and the exhaust pipe 6 for connecting vavuum pump 5 with the pumping tank 4, exhaust pipe 6
Close valve 601；It is additionally provided with exhaust pipe 6 on a straight open to atmosphere bye-pass 602, bye-pass 602 and switch valve 603 is housed；
(4) motor 7 electrically connected with the vavuum pump 5, vavuum pump 5 is driven by motor 7, opens opening on exhaust pipe 6
Valve 601 is closed, then pumping tank 4 can be evacuated, so as to reduce the pressure of tested pump intake；When on opening bye-pass 602
Switch valve 603, close exhaust pipe 6 on switch valve 601 when, vavuum pump 5 does not come into operation, and the present embodiment passes through the two
The switching of switch valve and avoid frequent starting, stop motor 7.
(5) He of electric gate valve 801 is installed on the inlet pipeline 8 connected with the water inlet of tested water pump 10, inlet pipeline 8
Pressure transmitter 802；The current that electric gate valve 801 is blocked when being mainly used in mounting and dismounting water pump 10 to be measured in inlet pipeline 8,
Pressure transmitter 802 is used for the pressure for measuring the water inlet of tested water pump 10, and pressure signal is changed into electric signal.
(6) be provided with the outlet pipeline 9 connected with the delivery port of tested water pump 10, outlet pipeline 9 electric gate valve 901,
Pressure transmitter 902 and switch valve 903.The main function of electric gate valve 901 is, when needing maintenance pipeline or instrument, to be used for
The current blocked in outlet pipeline 9.Pressure transmitter 902 is used for the pressure for measuring the water outlet of tested water pump 10, and will pressure
Force signal is changed into electric signal.Switch valve 903 is used to be vented to outlet pipeline 9 in process of the test.
(7) observing and controlling cabinet, it passes through signal wire and foregoing each electric gate valve, pressure transmitter, switch valve, flowmeter, pneumatic
Regulating valve is connected, and is integrated with data acquisition module and data control block, observing and controlling cabinet in observing and controlling cabinet and is additionally provided with network output and connects
Mouthful, for the industrial computer communication equipped with test program.
During pump cavitation surplus test system work of the present invention, first tested water pump 10 and pump motor 11 are turned by torque
Fast sensor 12 is connected, and pump motor 11 drives water pump 10 to operate after starting.In process of the test, water outlet of the water from tested water pump 10
Mouth discharge, enters drain tank 1 through outlet pipeline 9, then flows into water tank 2 through flow adjustment pipe 3, forms a closed system.
When testing pump cavitation surplus, start motor 7, open the switch valve 601 on exhaust pipe 6, the switch closed on bye-pass 602
Valve 603, vavuum pump 2 is come into operation, and pumping tank 4 is evacuated, so that the purpose of the tested pump intake pressure of regulation is reached,
When the reduction of tested pump intake pressure value causes water pump to occur cavitation, the cavitation experiment of the operating point terminates.Under entrance
Before the experiment of one operating point, the switch valve 601 closed on exhaust pipe 6 opens the switch valve 603 on bye-pass 602, then very
Empty pump 5 does not come into operation.It is foregoing each electric gate valve, pressure transmitter, switch valve, flowmeter, pneumatic in whole test process
The signal wire of regulating valve is linked into the data acquisition module of observing and controlling cabinet, and data acquisition module is defeated by the signal of above-mentioned each transmitter
Enter into industrial computer and carry out data processing.According to the instruction sent after industrial computer processing data, data control block is controllable each
The working condition of electric gate valve, switch valve and pneumatic control valve.
Embodiment 2
Involved by embodiment 2 is pump cavitation surplus method of testing, that is, the method part in the present invention.Generally
Come, before pump cavitation experiment is carried out, advanced water-filling pump performance test (abbreviation performance test), result of performance test can be with
Obtain one group of flow, lift data.Carry out cavitation experiment when, can by flow, lift data by fitting of a polynomial into a flow-
Head curve Q-H, and the curve translates downwards along ordinate to 3% (even if the also institute in a coordinate system of the every bit on the curve
3%) corresponding height value H declines, and obtains cavitation experiment judgment standard curve Q-H3.In addition, during performance test, can also
One group of flow, valve opening data, i.e. one valve opening value of each target flow value correspondence are obtained, these data are to cavitation
Experiment is also useful.In a word, the present invention makes full use of performance test results, can improve cavitation experiment efficiency, saves regulation
Time.
Net positive suction head test system of the present invention, the side of unit fixed on water pump suction pressure is reduced using vavuum pump to the pumping of pumping tank
Formula, whole process of the test system pipeline resistance keeps constant, and system tends to dynamic equilibrium.Therefore, start after vavuum pump, industrial computer
Start each transmitter reading of continuous acquisition, and calculate the lift value H of water pump in real timea.Meanwhile, industrial computer is according to Q-H3Curve
Expression formula and the actual flow value collected in real time, corresponding lift determining reference value H is calculated by interpolation in real timet.With
Vacuum gradually rises in pumping of the vavuum pump to pumping tank, pumping tank, and unit fixed on water pump suction pressure gradually lowers, and survey calculation is obtained
Lift value HaIt is gradually reduced；And meter readings are also gradually reduced, then the benchmark lift value H that interpolation calculation is drawntAlso gradually subtract
It is small.Two lift value sizes of industrial computer real time contrast, until working as Ha≤HtWhen, then the cavitation experiment of the operating point terminates.Then enter
Enter the experiment of next operating mode.
Due to having tested after an operating point, pumping tank has formed vacuum state, therefore is entering next operating point
Cavitation experiment before, pumping tank need to be carried out tonifying Qi to its it is internal reach atmospheric pressure state, during tonifying Qi, vavuum pump must
It must stop to pumping tank pumping.For the present embodiment, by switching switch valve 601 and bye-pass on exhaust pipe 6
The working condition of switch valve 603 on 602, and frequent starting vavuum pump is avoided, that is, open switch valve 601, closing switch valve
603, vavuum pump is evacuated to pumping tank；Closing switch valve 601, opens switch valve 603, and vavuum pump stops taking out pumping tank
Gas, equivalent to stopping vaccum pump motor.
The general principle for the method for testing being described above in the present invention, its job step is specifically introduced below in conjunction with accompanying drawing
Suddenly；
The method that a kind of pump cavitation surplus test system shown in utilization Fig. 1 is tested pump cavitation surplus, its
Workflow is as shown in Fig. 2 specifically include following step：
Step one, industrial computer is according to performance test results, with fitting of a polynomial flow-lift curve Q-H, and will be whole bent
Line obtains Q-H along the translation 3% downwards of ordinate direction3Curve；
Step 2, the opening value that result gives pneumatic control valve 303 is recorded according to performance test；
Step 3, after pump cavitation surplus test system is stable, starts vavuum pump 5；
Step 4, opens the switch valve 601 of exhaust pipe 6, and the switch valve 603 closed on bye-pass 602, vavuum pump 5 is thrown
Enter to use；
Step 5, continuous acquisition pressure transmitter 802,902, flowmeter 302, the signal of torque rotary speed sensor 12, and
Calculate lift value H in real timea；
Step 6, industrial computer is according to Q-H3Curve representation formula and the actual flow value collected in real time, it is real-time by interpolation
Calculate corresponding lift determining reference value Ht；
Step 7, real time contrast HaAnd HtValue；
Step 8, works as Ha≤HtWhen, the switch valve 601 of exhaust pipe 6 is closed, the switch valve 603 on bye-pass 602 is opened；
Step 9, opens the switch valve 401 on pumping tank 4, carries out tonifying Qi to pumping tank, tonifying Qi terminates rear closing switch valve
401；
Step 10, into next operating mode experimental tests, repeats the second to the 9th step, until all operating points have been tested
Finish；
Step 11, draws flow-net positive suction head Q-NPSH curves, and the curve is as shown in Figure 4；
Step 12, substitutes into Q-NPSH curve representation formulas by one group of flow targets operating mode value to be measured, then can try to achieve one group
Net positive suction head value.
The test of pump cavitation surplus can be completed by above-mentioned 12 steps, test result is after data processing, such as
Shown in Fig. 3.
Claims (4)
1. a kind of pump cavitation surplus Auto-Test System, it includes components described below：
(1) it is provided with the flow adjustment pipe of drain tank, water tank and connection drain tank and water tank, flow adjustment pipe
Electric gate valve, flowmeter, pneumatic control valve；
(2) it is arranged on the pumping tank on the water tank；
(3) switch valve, pumping are housed on vavuum pump and the exhaust pipe for connecting vavuum pump with the pumping tank, exhaust pipe
It is additionally provided with pipeline on a straight open to atmosphere bye-pass, bye-pass and is also equipped with switch valve；
(4) motor electrically connected with the vavuum pump；
(5) electric gate valve and pressure transmitter are installed on the inlet pipeline connected with the water inlet of tested water pump, inlet pipeline；
(6) be provided with the outlet pipeline connected with the delivery port of tested water pump, outlet pipeline electric gate valve, pressure transmitter and
Switch valve；
(7) observing and controlling cabinet, it passes through signal wire and foregoing each electric gate valve, pressure transmitter, switch valve, flowmeter, pneumatic regulation
Valve is connected, and is integrated with observing and controlling cabinet on data acquisition module and data control block, observing and controlling cabinet and is additionally provided with networking output interface, is used
In with the industrial computer communication equipped with test program.
2. pump cavitation surplus Auto-Test System as claimed in claim 1, it is characterised in that：It is also connected with the pumping tank
There is switch valve, it is to give pumping tank tonifying Qi that it, which is acted on,.
3. pump cavitation surplus Auto-Test System as claimed in claim 1 or 2, it is characterised in that：On the water tank also
Temperature transmitter is installed, for measuring the temperature of a liquid in real time.
4. a kind of method of testing of pump cavitation surplus, it comprises the steps：
Step one, industrial computer is according to performance test results, with fitting of a polynomial flow-lift curve Q-H, and by whole curve edge
The translation 3% downwards of ordinate direction, obtains Q-H3Curve；
Step 2, the opening value that result gives pneumatic control valve is recorded according to performance test；
Step 3, after pump cavitation surplus Auto-Test System is stable, starts vavuum pump；
Step 4, opens the switch valve on exhaust pipe, and the switch valve closed on bye-pass, vavuum pump comes into operation；
Step 5, continuous acquisition pressure transmitter, flowmeter, the signal of torque rotary speed sensor, and lift value is calculated in real time
Ha；
Step 6, industrial computer is according to Q-H3Curve representation formula and the actual flow value collected in real time, are calculated in real time by interpolation
Corresponding lift determining reference value Ht；
Step 7, real time contrast HaAnd HtValue；
Step 8, works as Ha≤HtWhen, the switch valve closed on exhaust pipe opens the switch valve on bye-pass；
Step 9, opens the switch valve on pumping tank, and tonifying Qi, the switch that tonifying Qi is closed after terminating on pumping tank are carried out to pumping tank
Valve；
Step 10, into next operating mode experimental tests, repeats the second to the 9th step, until all operating points are completed；
Step 11, draws flow-net positive suction head Q-NPSH curves；
Step 12, substitutes into Q-NPSH curve representation formulas by one group of flow targets operating mode value to be measured, then can try to achieve one group of cavitation
Margin value.
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| CN106968934B CN106968934B (en) | 2018-12-18 |
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Cited By (11)
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|---|---|---|---|---|
| CN107676272A (en) * | 2017-09-14 | 2018-02-09 | 江苏大学 | A kind of fast adjuster of Working Conditions of Centrifugal Injection Pumps |
| CN108678939A (en) * | 2018-05-09 | 2018-10-19 | 山东省农业机械科学研究院 | The detection method and system of pump cavitation margin value |
| CN108825483A (en) * | 2018-05-25 | 2018-11-16 | 江苏大学 | A kind of pump full working scope testing stand |
| CN109162910A (en) * | 2018-06-29 | 2019-01-08 | 武汉船用机械有限责任公司 | A kind of test device and test method of Cargo Oil Pump performance |
| CN110566474A (en) * | 2019-10-15 | 2019-12-13 | 中国计量大学 | Water pump test device capable of measuring wide lift range |
| CN112102697A (en) * | 2020-07-29 | 2020-12-18 | 北京化工大学 | Multifunctional experimental device for fault self-healing regulation and control and process control of centrifugal pump |
| CN112814885A (en) * | 2020-08-05 | 2021-05-18 | 昆明嘉和科技股份有限公司 | High-precision automatic test equipment and method for industrial pump |
| CN109371476B (en) * | 2018-08-20 | 2021-08-10 | 宁波卓成化纤有限公司 | Temperature control method by using temperature control system with multipoint temperature difference of one biphenyl furnace |
| CN114837931A (en) * | 2022-06-09 | 2022-08-02 | 湖南高创翔宇科技有限公司 | Fuel pump test system and method |
| CN114876822A (en) * | 2022-06-01 | 2022-08-09 | 江苏大学 | Centrifugal pump gas injection cavitation performance testing system and testing method capable of achieving uniform gas filling |
| CN116146501A (en) * | 2023-01-03 | 2023-05-23 | 广州市昕恒泵业制造有限公司 | Control system and method capable of reducing pump cavitation and changing pumping medium characteristics |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107676272B (en) * | 2017-09-14 | 2019-05-31 | 江苏大学 | A kind of fast adjuster of Working Conditions of Centrifugal Injection Pumps |
| CN107676272A (en) * | 2017-09-14 | 2018-02-09 | 江苏大学 | A kind of fast adjuster of Working Conditions of Centrifugal Injection Pumps |
| CN108678939A (en) * | 2018-05-09 | 2018-10-19 | 山东省农业机械科学研究院 | The detection method and system of pump cavitation margin value |
| CN108825483A (en) * | 2018-05-25 | 2018-11-16 | 江苏大学 | A kind of pump full working scope testing stand |
| CN109162910A (en) * | 2018-06-29 | 2019-01-08 | 武汉船用机械有限责任公司 | A kind of test device and test method of Cargo Oil Pump performance |
| CN109371476B (en) * | 2018-08-20 | 2021-08-10 | 宁波卓成化纤有限公司 | Temperature control method by using temperature control system with multipoint temperature difference of one biphenyl furnace |
| CN110566474A (en) * | 2019-10-15 | 2019-12-13 | 中国计量大学 | Water pump test device capable of measuring wide lift range |
| CN112102697A (en) * | 2020-07-29 | 2020-12-18 | 北京化工大学 | Multifunctional experimental device for fault self-healing regulation and control and process control of centrifugal pump |
| CN112814885A (en) * | 2020-08-05 | 2021-05-18 | 昆明嘉和科技股份有限公司 | High-precision automatic test equipment and method for industrial pump |
| CN114876822A (en) * | 2022-06-01 | 2022-08-09 | 江苏大学 | Centrifugal pump gas injection cavitation performance testing system and testing method capable of achieving uniform gas filling |
| CN114837931A (en) * | 2022-06-09 | 2022-08-02 | 湖南高创翔宇科技有限公司 | Fuel pump test system and method |
| CN114837931B (en) * | 2022-06-09 | 2024-03-22 | 湖南高创翔宇科技有限公司 | Fuel pump testing system and method |
| CN116146501A (en) * | 2023-01-03 | 2023-05-23 | 广州市昕恒泵业制造有限公司 | Control system and method capable of reducing pump cavitation and changing pumping medium characteristics |
| CN116146501B (en) * | 2023-01-03 | 2024-01-12 | 广州市昕恒泵业制造有限公司 | Control system and method capable of reducing pump cavitation and changing pumping medium characteristics |
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| CN106968934B (en) | 2018-12-18 |
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Address after: 528131 No. 1 and 3 Hui Cai road, Bai Ni Town, Sanshui District, Foshan, Guangdong Applicant after: GUANGDONG KENFULAI PUMP CO., LTD. Address before: 528000 14 Riverside Road, Chancheng District, Foshan, Guangdong Applicant before: GUANGDONG KENFULAI PUMP CO., LTD. |
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