Testing device and testing method for testing performance of pump

Abstract

The invention provides a test device and a test method for testing pump performance, relates to the technical field of fluid machinery test, and solves the problems that the labor cost is increased and the test efficiency is high because the existing visual test pump cavitation test bench needs more operators to complete various tasks in actual operation. And errors of test results may be caused by human factors. According to the technical scheme, by adjusting the layout of the test bed, the number of field operators is reduced, and the labor cost is reduced; the test operation efficiency is improved, and the test period is shortened; interference caused by uncoordinated operation of multiple persons is reduced; according to the invention, the accuracy and reliability of test results can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery testing, and specifically to a test pump performance test device and a test method. Background Art

[0002] The visualization axial flow pump cavitation test bench plays an important role in fluid machinery testing. However, in actual operation, a large number of operators are required to complete various tasks, which not only increases the labor cost but also may lead to errors in test results due to human factors.

[0003] Therefore, it is necessary to propose an optimized solution to reduce the number of operators, improve the test efficiency and accuracy. Summary of the Invention

[0004] Therefore, the present invention solves the technical problem that in the actual operation of the visualization axial flow pump cavitation test bench in the prior art, a large number of operators are required to complete various tasks, which not only increases the labor cost but also may lead to errors in test results due to human factors. The test pump performance test device and test method provided by the present invention reduce the number of on-site operators by adjusting the test bench layout, thereby reducing the labor cost; improve the operation efficiency of the test, shorten the test cycle; reduce the interference of incoordination among multiple operators, and improve the accuracy and reliability of test results.

[0005] A test pump performance test device provided by the present invention includes: a test bench for creating a test environment for the test pump; a data acquisition system arranged on the test bench for acquiring test data; the test bench and the data acquisition system are connected to a control system, and the control system is used to control the operation of the test bench and the data acquisition system.

[0006] Further, the test bench includes: a water tank, the water tank is connected to the inlet end of the test pump through a butterfly valve; the outlet end of the test pump is connected to a booster pump; the booster pump is connected to the water tank through a regulating valve. A vacuum pump is connected to the top of the water tank. The test pump is an axial flow pump. In the pump cavitation test, when adopting the test chain layout of "motor → torque meter → transmission shaft → pump", each component is connected in segments through a pin coupling: the motor and the torque meter are connected through a single flange pin coupling (to buffer the starting shock), the torque meter and the transmission shaft are connected through a double flange pin coupling (to ensure the torque transmission accuracy), and the transmission shaft and the pump shaft of the test pump are connected through an elastic pin coupling (to absorb cavitation vibration). This configuration takes into account the power transmission efficiency, measurement reliability and dynamic adaptability under cavitation conditions.

[0007] Further, the data acquisition system includes a torque meter disposed between the output shaft of the motor and the transmission shaft; an inlet pressure sensor disposed between the inlet end of the test pump and the butterfly valve; an outlet pressure sensor disposed between the outlet end of the test pump and the booster pump; an electromagnetic flowmeter disposed between the booster pump and the regulating valve; a pressure pulsation sensor and a vibration sensor are provided on the test pump, and the pressure pulsation sensor and the vibration sensor are respectively connected to a first acquisition box and a second acquisition box; the pressure pulsation sensor is provided with 6 pressure pulsation monitoring points at the inlet, impeller, impeller guide vane dynamic and static interference area, guide vane, and outlet of the test pump, and the pressure pulsation monitoring points are directly connected through 1 / 4"NPT threads, and the signals are transmitted to the first acquisition box equipped with an anti-aliasing filter, i.e., the pressure pulsation acquisition box, through coaxial cables; the vibration sensor is provided with 3 vibration signal monitoring points in the XYZ three directions of the impeller of the test pump, the vibration sensor is fixed by glue, the vibration sensor uses a BNC interface, and the signal is connected to the second acquisition box, i.e., the vibration signal acquisition box, through a shielded twisted pair. A high-speed camera is provided beside the test pump.

[0008] Further, the control system uses a frequency conversion control cabinet, which is electrically connected to each component in the device. The test pump, the inlet pressure sensor, the butterfly valve, the water tank, the regulating valve, the electromagnetic flowmeter, the booster pump, and the outlet pressure sensor are all connected through pipelines.

[0009] Further, it also includes a pump parameter measuring instrument and a computer. The torque meter is directly connected in series between the motor and the transmission shaft of the pump through a flange coupling to monitor the shaft power in real time; the inlet pressure sensor is installed at a position 3-5 times the pipe diameter from the inlet flange in the suction section of the pump and is connected to the pipeline through an annular pressure tapping device; the outlet pressure sensor is arranged at a position 5-8 times the pipe diameter from the outlet flange in the discharge section and adopts a 45° inclined pressure tapping method; the flowmeter is preferably electromagnetic and is installed in a vertical pipe section 10-15 times the pipe diameter downstream of the outlet. All instruments output through 4-20mA+RS485 dual mode, are connected to the pump parameter measuring instrument through shielded cables, and adopt a single-point grounding method to ensure that the synchronous acquisition accuracy of each parameter reaches 0.5 level, fully meeting the requirements of the GB / T3216-2016 standard. The pump parameter measuring instrument can accurately calculate key performance parameters such as the head and efficiency of the pump through real-time correlation analysis of the torque meter, the inlet and outlet pressure differences, and the flow data. The computer realizes the full-system integration through a multi-channel high-speed data acquisition system: connects to the pump parameter measuring instrument through the PXIe bus and adopts fiber optic isolation technology to ensure a measurement accuracy of 0.2 level; directly connects to the pressure pulsation signal acquisition box through coaxial cables and accesses the vibration signal acquisition box through shielded twisted pairs; the high-speed camera is connected to the computer through the Camera Link Full interface.

[0010] The present invention also provides a test method based on the above test pump performance test device, including the following steps:

[0011] S1: Turn on the motor and run the test pump. Maintain the test pump under low-flow pure water conditions, check the pipeline tightness, and debug the experimental equipment to ensure normal operation.

[0012] S2: Focus on the shooting position of the test pump, select appropriate focal length, pixel, and camera parameters, and use the LED light source to supplement light for the internal flow field position to be shot. Align the lens of the high-speed camera with the shooting position, and shine the light from 45° on the left side. Conduct the initial shooting, observe whether the shooting result is in focus, and adjust the light source until there is no dispersion and no highlight phenomenon. Adjust the sampling parameters of the pressure pulsation signal and the vibration signal.

[0013] S3: Keep the rotational speed of the test pump at the rated speed condition, adjust the booster pump to make the flow rate reach the specified condition, turn on the vacuum pump, and reduce the inlet pressure by adjusting the valve opening of the vacuum pump. When the inlet pressure is adjusted to the target value, turn off the vacuum pump.

[0014] S4: When the test pump runs smoothly, collect 10s of high-speed photography pictures, pressure pulsation signals, and vibration signals in this state through the computer.

[0015] S5: Repeat the above experimental operations, and collect high-speed photography pictures, pressure pulsation signals, and vibration signals under different working conditions respectively.

[0016] S6: End of the experiment: First, turn off the booster pump, then reduce the rotational speed of the test pump to stop the test pump from running. Open the valve of the vacuum pump to release the pressure in the flow channel. Store the collected data through the computer.

[0017] The present invention has the following advantages compared with the prior art:

[0018] 1. A test pump performance test device provided by the present invention reduces the number of on-site operators, reduces labor costs, improves the operation efficiency of the test, shortens the test cycle, reduces the interference of incoordination among multiple operators, and improves the accuracy and reliability of the test results by adjusting the test bench layout.

[0019] 2. The pump performance test method provided by the present invention uses the above test device, reasonably arranges the operation process, enables the orderly progress of each test step, and at the same time meets the test data requirements of the test, further improving the accuracy and reliability of the test results. Brief Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Explanation of reference numerals in the drawings:

[0023] 1. Motor; 2. Torque meter; 3. Test pump; 4. Inlet pressure sensor; 5. Butterfly valve; 6. Water tank; 7. Control valve; 8. Electromagnetic flowmeter; 9. Booster pump; 10. Pressure pulsation sensor; 11. Vibration sensor; 12. First acquisition box; 13. Second acquisition box; 14. Pump parameter measuring instrument; 15. Computer; 16. Vacuum pump; 17. Frequency conversion control cabinet; 18. High-speed camera; 19. Outlet pressure sensor; 20. Drive shaft. Specific embodiments

[0024] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1

[0026] Figure 1 A test pump performance test device provided in this embodiment, as Figure 1 shown, includes a test bench, and the test bench is used to create a test environment for the test pump 3; a data acquisition system is arranged on the test bench for acquiring test data; the test bench and the data acquisition system are connected to a control system, and the control system is used to control the operation of the test bench and the data acquisition system.

[0027] In this embodiment, the test bench includes: a water tank 6, and the water tank 6 is connected to the inlet end of the test pump 3 through a butterfly valve 5; the outlet end of the test pump 3 is connected to a booster pump 9; the booster pump 9 is connected to the water tank 6 through a control valve 7. The top of the water tank 6 is connected to a vacuum pump 16. The data acquisition system includes a torque meter 2, which is arranged between the output shaft of the motor 1 and the drive shaft; an inlet pressure sensor 4, which is arranged between the inlet end of the test pump 3 and the butterfly valve 5; an outlet pressure sensor 19, which is arranged between the outlet end of the test pump 3 and the booster pump 9; an electromagnetic flowmeter 8, which is arranged between the booster pump 9 and the control valve 7; a pressure pulsation sensor 10 and a vibration sensor 11 are arranged on the test pump 3, and the pressure pulsation sensor 10 and the vibration sensor 11 are respectively connected to a first acquisition box 12 and a second acquisition box 13; a high-speed camera 18 is arranged beside the test pump 3.

[0028] The motor 1 is connected to the drive shaft through a torque meter 2. The inlet end of the test pump 3 section is connected to the water tank 6 through a butterfly valve 5, and the outlet end is connected to the booster pump 9. The booster pump 9 is then connected to the water tank 6 through a regulating valve 7; the upper end of the water tank 6 is connected to the vacuum pump 16. The vacuum pump 16, the booster pump 9, and the regulating valve 7 are used to adjust the pressure and flow environment in the test bench to meet the requirements of the cavitation test; the vacuum pump 16 is connected to the water tank 6 through a stainless steel pipe to quickly pump the system pressure below the specified value to establish an initial low-pressure environment; the booster pump 9 boosts the flow rate to the target value through variable-frequency drive (stepless adjustment from 0 - 50 Hz); the regulating valve 7 controls the flow rate by adjusting the opening degree of the valve. The torque meter 2 can detect the torque and rotational speed of the test pump 3 in real time; the inlet pressure sensor 4 and the outlet pressure sensor 19 can detect the inlet pressure and outlet pressure of the test pump 3 in real time; the electromagnetic flowmeter 8 is used to detect the flow rate during the test process; the pressure pulsation sensor 10 and its first acquisition box 12 and the vibration sensor 11 and its second acquisition box 13 collect pressure pulsation signals and vibration signals respectively; the high-speed camera 18 is used to judge the cavitation state in real time;

[0029] In this embodiment, the control system uses a variable-frequency control cabinet 17, which is electrically connected to each component in the device. The test pump 3, the inlet pressure sensor 4, the butterfly valve 5, the water tank 6, the regulating valve 7, the electromagnetic flowmeter 8, the booster pump 9, and the outlet pressure sensor 19 are all connected through pipes.

[0030] The variable-frequency control cabinet 17 adjusts the flow rate of the test pump 3 by controlling the booster pump 9 and the regulating valve 7; the variable-frequency control cabinet 17 adjusts the pressure of the test pump 3 by controlling the vacuum pump 16 to achieve the adjustment of different cavitation states. The high-speed photography experiment, the pressure pulsation acquisition experiment, and the vibration signal acquisition experiment are carried out synchronously. During the experiment, after waiting for the external characteristics to stabilize, data acquisition is carried out without changing the opening degrees of all valves in the gas and liquid pipelines.

[0031] In this embodiment, it also includes a pump parameter measuring instrument 14 and a computer 15; which are mainly used to collect, analyze, and record the parameters of the pump's torque, flow rate, and inlet and outlet pressures in real time, providing accurate data support for evaluating cavitation characteristics, verifying design indicators, and optimizing operating conditions.

[0032] Embodiment 2

[0033] This embodiment provides a test method based on the above test pump performance test device, including the following steps:

[0034] (1) Operator A turns on the motor 1 through the variable-frequency control cabinet 17 and runs the test pump 3. Through the variable-frequency control cabinet 17, the test pump 3 can be maintained under low-flow pure water conditions at a low rotational speed, check the pipeline tightness and debug the experimental equipment to ensure normal operation.

[0035] (2) Focus on the shooting position of the test pump 3, select appropriate focal length, pixels and camera parameters, and use the LED light source to supplement light for the internal flow field position to be shot. The lens of the high-speed camera 18 is aligned with the shooting position, and the light is illuminated from 45° on the left side. Conduct the initial shooting, observe whether the shooting result is in focus correctly, and adjust the light source until there is no dispersion and no highlight phenomenon. At the same time, operator A adjusts the sampling parameters of the pressure pulsation signal and the vibration signal.

[0036] (3) Operator A makes the rotational speed of the test pump 3 under the rated speed condition through the frequency conversion control cabinet 17. Operator A adjusts the booster pump 9 through the frequency conversion control cabinet 17 to make the flow rate reach the specified condition. Operator A turns on the vacuum pump 16 through the frequency conversion control cabinet 17. Operator A reduces the inlet pressure by adjusting the valve opening of the vacuum pump 16. When the inlet pressure is adjusted to the target value, operator A closes the vacuum pump 16 through the frequency conversion control cabinet 17, and operator A closes the valve of the vacuum pump 16.

[0037] (4) When the test pump 3 runs smoothly, operator A collects the high-speed photography pictures, pressure pulsation signals and vibration signals for 10 s in this state through the computer 15.

[0038] (5) Repeat the above experimental operations, and collect the high-speed photography pictures, pressure pulsation signals and vibration signals under different working conditions respectively.

[0039] (6) After the experiment is over, operator A first closes the booster pump 9 through the frequency conversion control cabinet 17, and then reduces the rotational speed of the test pump 3 through the frequency conversion control cabinet 17 to stop the test pump 3 from running. Operator A opens the valve of the vacuum pump 11 to release the pressure in the flow channel. Operator A stores the collected data through the computer 12.

[0040] By adopting the above method, the operation process is reasonably arranged to make the various test steps proceed in an orderly manner. Only one person is needed to complete the test, reducing the number of on-site operators and the labor cost. At the same time, this method meets the test data requirements of the test, further improving the accuracy and reliability of the test results.

[0041] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A test pump performance test device, characterized in that, Comprising: A test bench for creating a test environment for the test pump (3); a data acquisition system is provided on the test bench for collecting test data; the test bench and the data acquisition system are connected to a control system for controlling the operation of the test bench and the data acquisition system.

2. The test pump performance test device according to claim 1, characterized in that, The test bench includes: a water tank (6) connected to the inlet end of the test pump (3) through a butterfly valve (5); the outlet end of the test pump (3) is connected to a booster pump (9); the booster pump (9) is connected to the water tank (6) through a regulating valve (7); the test pump (3) is connected to the output shaft of the motor (1) through a transmission shaft (20).

3. The test pump performance test device according to claim 2, characterized in that, A vacuum pump (16) is connected to the top of the water tank (6).

4. The test pump performance test device according to claim 3, wherein, The data acquisition system includes a torque meter (2) disposed between the output shaft of the motor (1) and the transmission shaft; an inlet pressure sensor (4) disposed between the inlet end of the test pump (3) and the butterfly valve (5); an outlet pressure sensor (19) disposed between the outlet end of the test pump (3) and the booster pump (9); an electromagnetic flowmeter (8) disposed between the booster pump (9) and the regulating valve (7); a pressure pulsation sensor (10) and a vibration sensor (11) are provided on the test pump (3), and the pressure pulsation sensor (10) and the vibration sensor (11) are respectively connected to a first acquisition box (12) and a second acquisition box (13).

5. The test pump performance test device according to claim 4, characterized in that, A high-speed camera (18) is provided beside the test pump (3).

6. The test pump performance test device according to claim 5, characterized in that The control system uses a variable frequency control cabinet (17) which is electrically connected to each component in the device.

7. The test pump performance test device according to claim 6, characterized in that, It further includes a pump parameter measuring instrument (14) for calculating key performance parameters such as the head and efficiency of the test pump (3).

8. The test pump performance test device according to claim 7, characterized in that, It further includes a computer (15) which is connected to the first acquisition box (12), the second acquisition box (13), the pump parameter measuring instrument (14) and the high-speed camera (18).

9. A testing method for a testing pump performance test device according to any one of claims 1 to 8, characterized in that Including the following steps: S1: Turn on the motor (1), run the test pump (3), maintain the test pump (3) under low-flow pure water conditions, check the pipeline tightness and debug the experimental equipment to ensure normal operation; S2: Focus on the shooting position of the test pump (3), select appropriate focal length, pixel and camera parameters, and use an LED light source to supplement light for the inner flow field position to be shot; the lens of the high-speed camera (18) is aligned with the shooting position, and the light is illuminated from 45° on the left; conduct the first shooting, observe whether the shooting result is in focus correctly, and adjust the light source until there is no dispersion and no high-light phenomenon; Adjust the sampling parameters of the pressure pulsation signal and the vibration signal; S3: Make the rotational speed of the test pump (3) under the rated speed condition, adjust the booster pump (9) so that the flow rate reaches the specified condition, turn on the vacuum pump (16), reduce the inlet pressure by adjusting the valve opening of the vacuum pump (16), and close the vacuum pump (16) when the inlet pressure is adjusted to the target value; S4: When the test pump (3) runs smoothly, collect 10s of high-speed photography pictures, pressure pulsation signals and vibration signals in this state through the computer (15); S5: Repeat the above experimental operations to collect high-speed photography pictures, pressure pulsation signals and vibration signals under different working conditions respectively; S6: End of experiment: First, turn off the booster pump (9), then reduce the rotational speed of the test pump (3) until the test pump (3) stops running; open the valve of the vacuum pump (16) to release the pressure in the flow channel; store the collected data through the computer (15).

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