Experimental device for measuring cavitation of water pump

Abstract

The utility model provides an experimental device for measuring water pump cavitation, and belongs to the technical field of water pump cavitation experiments. The experimental device for measuring cavitation of the water pump comprises the water pump, a liquid storage tank and an observation assembly. The water pump comprises a motor and a pump head, a revolution meter and a power meter are installed on the motor, the observation assembly comprises an upper transparent observation pipe and an electric sliding table, the flow guide pipe is connected with the liquid storage tank through a pipe connector, and the other intelligent control sensing connector is connected with the flow meter assembly through a bent pipe. And the liquid storage tank is connected with the pump head through a second connecting part. Key data and images in experiments can be monitored, observed and recorded in real time, liquid flow characteristics and cavitation phenomena can be deeply analyzed conveniently, meanwhile, the water pump is improved, experimenters can better understand performance changes of the water pump under different pressure levels, the working state of the water pump can be adjusted and monitored in real time, and the experiment efficiency is improved. The experiment conditions are better controlled, and the use is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of water pump cavitation experiments, in particular to an experimental device for measuring water pump cavitation. Background Art

[0002] The phenomenon that bubbles formed by vaporization in liquid shrink rapidly in the high-pressure area of ​​liquid, generating high-intensity shock waves and damaging the components in the area where the liquid flows is called cavitation. The cavitation phenomenon of water pumps does cause certain harm to water pumps in actual use, causing chemical corrosion, damaging the internal structure of the water pump, causing a decrease in flow, head, and efficiency, and affecting its working efficiency and life. Therefore, the critical cavitation amount of water pumps is one of the important indicators to measure the performance of water pumps. The study of the critical cavitation amount of water pumps is very critical, which helps to optimize the design of water pumps and ensure their safe and efficient operation. Definition of critical cavitation amount of water pumps (NPSHr): In order to avoid cavitation in water pumps, the minimum absolute pressure (the value after removing the steam pressure and velocity pressure) that must be maintained at the inlet of the water pump is usually expressed in meters (m) of water column height.

[0003] At present, prototype experiment: testing in the actual working environment, directly measuring the point where cavitation begins to appear under various working conditions. But it is costly and time-consuming. Model experiment: using a smaller and simpler model than the prototype to test in a laboratory environment. It is not convenient for observation, and the accuracy is slightly low. The experiment is inconvenient. Therefore, it is necessary to propose an experimental device for measuring water pump cavitation to solve the above problems. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides an experimental device for measuring water pump cavitation, which aims to improve the test in the actual working environment and directly measure the point where cavitation begins to appear under various working conditions. However, it is costly and time-consuming. Model experiment: Use a smaller and simpler model than the prototype to test in a laboratory environment. It is not convenient for observation, and the accuracy is slightly low. The experiment is relatively inconvenient.

[0005] The utility model is achieved in this way:

[0006] The utility model provides an experimental device for measuring cavitation of a water pump, comprising a water pump, a liquid storage tank and an observation component.

[0007] The water pump includes a motor and a pump head. A tachometer and a power meter are installed on the motor. The power meter is located on one side of the tachometer. A distance meter is installed below the motor. The pump head is installed at the output end of the motor. The pump head is connected to a flow meter assembly via a first connecting portion. The observation assembly includes an upper transparent observation tube and an electric slide. Intelligent control sensor connectors are installed at both ends of the upper transparent observation tube. The electric slide is installed on the intelligent control sensor connector. A high-definition camera is installed on the electric slide. One of the intelligent control sensor connectors is installed with a guide tube via a bend pipe connector. The guide tube is connected to the liquid storage tank via a pipe connector. The other intelligent control sensor connector is connected to the flow meter assembly via a bend pipe. The liquid storage tank is connected to the pump head via a second connecting portion.

[0008] In one embodiment of the utility model, the first connecting portion comprises a water supply pipe, one end of the water supply pipe is connected to the pump head via a pipe joint, and a water supply pressure gauge and a water supply valve are installed on the water supply pipe.

[0009] In one embodiment of the utility model, the flow meter assembly includes a transparent inner tube and a float, the bottom of the transparent inner tube is connected to the water supply pipe, scales are fixed on both sides of the surface of the transparent inner tube, the float floats inside the transparent inner tube, and the upper end of the transparent inner tube is connected to the bent pipe.

[0010] In one embodiment of the utility model, a main water inlet is formed on the liquid storage tank, a main water cover is installed on the main water inlet, an air vent is formed on the liquid storage tank, an air vent is installed on the air vent, a drain port is formed at the bottom of the liquid storage tank, a drain valve is installed on the drain port, an air suction port is also formed on the liquid storage tank, an air suction member is installed on the air suction port, and a transparent liquid level observation plate is embedded on the surface of the liquid storage tank.

[0011] In one embodiment of the utility model, the vacuum component includes a vacuum valve, a vacuum pump and a vacuum pressure gauge, the vacuum valve and the vacuum pressure gauge are installed on the vacuum port, and the air inlet of the vacuum pump is connected to the vacuum valve.

[0012] In one embodiment of the utility model, the second connecting part includes a lower transparent observation tube, one end of the lower transparent observation tube is connected to the liquid storage tank, the other end of the lower transparent observation tube is connected to the pump head through a pipe joint, and a pumping valve and a pumping pressure gauge are installed on the lower transparent observation tube.

[0013] The beneficial effect of the utility model is as follows: the utility model obtains an experimental device for measuring cavitation of a water pump through the above-mentioned design. When in use, observe whether the liquid level is too low or too high through the transparent liquid level observation plate on the surface of the liquid storage tank, then turn on the water pump, adjust the water supply valve and the pumping valve, and at this time, drive the high-definition camera to move back and forth through the electric slide. Observe through the high-definition camera that there are no bubbles in the liquid in the upper transparent observation tube, record the flow rate, the value of the water supply pressure gauge, the value of the pumping pressure gauge, and the pressure value of the intelligent control sensor joint at this time, and then adjust the water supply valve and the pumping valve to keep the flow rate unchanged, and at the same time make bubbles appear in the upper transparent observation tube, record the flow rate, the value of the water supply pressure gauge, the value of the pumping pressure gauge, and the pressure value of the intelligent control sensor joint at this time. Then select another flow value, repeat the above operation, and record multiple groups of data. Substitute the data into the formula to calculate the effective cavitation amount. In addition, the vacuum pump can be used to create a negative pressure environment, and the reading of the vacuum pressure gauge can be recorded and analyzed and compared when bubbles appear in the transparent observation tube. This allows real-time monitoring, observation and recording of key data and images in the experiment, which not only improves the accuracy of data collection, but also facilitates remote monitoring and analysis. This makes the experimental data richer and facilitates in-depth analysis of liquid flow characteristics and cavitation phenomena. At the same time, the water pump has been improved, and the function of directly displaying the speed and power on the water pump has been added, so that experimental personnel can better understand the changes in water pump performance at different pressure levels, adjust and monitor the working status of the water pump in real time, better control the experimental conditions, and use more conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the structure of an experimental device for measuring water pump cavitation provided by an embodiment of the utility model;

[0016] Figure 2 A schematic diagram of a top view of a tachometer of an experimental device for measuring cavitation in a water pump provided in an embodiment of the utility model;

[0017] Figure 3 A schematic diagram of the top view of the power meter structure of the experimental device for measuring water pump cavitation provided in the embodiment of the utility model.

[0018] In the figure: 100-water pump; 110-motor; 120-tachometer; 130-power meter; 140-distance meter; 150-pump head; 200-first connecting part; 210-water supply pipe; 220-water supply pressure gauge; 230-water supply valve; 300-flow meter assembly; 310-transparent inner tube; 320-scale; 330-float; 400-liquid storage tank; 401-transparent liquid level observation plate; 410-main water cover; 420-vent valve; 430-drain valve; 440-vacuum component; 441-vacuum valve; 442-vacuum pump; 443-vacuum pressure gauge; 500-observation component; 510-upper transparent observation tube; 520-electric slide; 530-high-definition camera; 540-intelligent control sensor connector; 550-elbow connector; 560-flow guide tube; 570-elbow; 600-second connecting part; 610-lower transparent observation tube; 620-water pumping valve; 630-water pumping pressure gauge. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0020] See also Figure 1-Figure 3 The utility model provides a technical solution: an experimental device for measuring cavitation of a water pump, comprising a water pump 100, a liquid storage tank 400 and an observation component 500.

[0021] See also Figure 1-Figure 3 The water pump 100 includes a motor 110 and a pump head 150 . A tachometer 120 and a power meter 130 are installed on the motor 110 . The power meter 130 is located on one side of the tachometer 120 . A distance meter 140 is installed below the motor 110 . The pump head 150 is installed at the output end of the motor 110 .

[0022] See also Figure 1 The pump head 150 is connected to the flow meter assembly 300 through the first connection part 200. The first connection part 200 includes a water supply pipe 210. One end of the water supply pipe 210 is connected to the pump head 150 through a pipe joint. A water supply pressure gauge 220 and a water supply valve 230 are installed on the water supply pipe 210.

[0023] See also Figure 1The observation component 500 includes an upper transparent observation tube 510 and an electric slide 520. Intelligent control sensor joints 540 are installed at both ends of the upper transparent observation tube 510. The electric slide 520 is installed on the intelligent control sensor joint 540. A high-definition camera 530 is installed on the electric slide 520. Under the action of the electric slide 520, the high-definition camera 530 can be driven to move back and forth to facilitate the observation of whether there are bubbles inside the upper transparent observation tube 510. One intelligent control sensor joint 540 is installed with a guide tube 560 through a bend pipe joint 550. The guide tube 560 is connected to the liquid storage tank 400 through a pipe joint, and the other intelligent control sensor joint 540 is connected to the flow meter assembly 300 through a bend pipe 570.

[0024] The flow meter assembly 300 includes a transparent inner tube 310 and a float 330. The bottom of the transparent inner tube 310 is connected to the water supply pipe 210. Scales 320 are fixed on both sides of the surface of the transparent inner tube 310. The float 330 floats inside the transparent inner tube 310. The upper end of the transparent inner tube 310 is connected to the curved pipe 570.

[0025] See also Figure 1 The liquid storage tank 400 is connected to the pump head 150 through the second connecting part 600; a main water inlet is formed on the liquid storage tank 400, and a main water cover 410 is installed on the main water inlet; a vent is formed on the liquid storage tank 400, and a vent valve 420 is installed on the vent; a drain port is formed at the bottom of the liquid storage tank 400, and a drain valve 430 is installed on the drain port; an air suction port is also formed on the liquid storage tank 400, and an air suction member 440 is installed on the air suction port; a transparent liquid level observation plate 401 is embedded on the surface of the liquid storage tank 400. Through the transformation of the original liquid storage tank 400, the transparent liquid level observation plate 401 is provided, which makes it more convenient to add water, drain water and observe the water level, improves the flexibility and safety of the experiment, and reduces the possible operational errors that may occur during the experiment. The air extraction member 440 includes an air extraction valve 441 , an air extraction pump 442 and a vacuum pressure gauge 443 . The air extraction valve 441 and the vacuum pressure gauge 443 are installed on the air extraction port. The air inlet of the air extraction pump 442 is connected to the air extraction valve 441 .

[0026] The second connection part 600 includes a lower transparent observation tube 610, one end of which is connected to the liquid storage tank 400, and the other end of which is connected to the pump head 150 through a pipe joint. A pumping valve 620 and a pumping pressure gauge 630 are installed on the lower transparent observation tube 610. The pressure value when bubbles are generated by the negative pressure of the liquid is concisely displayed through multiple dials, allowing the experimenter to accurately measure and record the specific pressure value when cavitation occurs. Accurate data helps to improve the design of the water pump 100 and resist the harm of cavitation.

[0027] Specifically, the working principle of the experimental device for measuring cavitation of water pumps is as follows: when in use, the transparent liquid level observation plate 401 on the surface of the liquid storage tank 400 is used to observe whether the liquid level is too low or too high, and then the water pump 100 is turned on, and the water supply valve 230 and the water pump valve 620 are adjusted. The liquid in the liquid storage tank 400 enters the transparent inner tube 310 through the upper water pipe 210, and then enters the upper transparent observation tube 510 through the bend 570, and then flows into the liquid storage tank 400 through the guide pipe 560. At this time, the high-definition camera 53 is driven by the electric slide 520. 0 moves back and forth, and observes through the high-definition camera 530 that there are no bubbles in the liquid in the upper transparent observation tube 510, and records the flow rate, the value of the water pressure gauge 220, the value of the pumping pressure gauge 630, and the pressure value of the intelligent control sensor joint 540 at this time, and then adjusts the water supply valve 230 and the pumping valve 620 to keep the flow rate unchanged, and at the same time observe the bubbles in the upper transparent observation tube 510, and record the flow rate, the value of the water pressure gauge 220, the value of the pumping pressure gauge 630, and the pressure value of the intelligent control sensor joint 540 at this time. Then select another flow value, repeat the above operation, and record multiple groups of data. Substitute the data into the formula to calculate the effective cavitation amount. In addition, the vacuum pump 442 can be used to create a negative pressure environment, and the reading of the vacuum pressure gauge 443 when bubbles appear in the upper transparent observation tube 510 can be recorded for analysis and comparison, so that the key data and images in the experiment can be monitored, observed and recorded in real time, which not only improves the accuracy of data acquisition, but also facilitates remote monitoring and analysis. The experimental data is made richer, which facilitates in-depth analysis of liquid flow characteristics and cavitation phenomena. At the same time, the water pump 100 is improved, and a function that can directly display the speed and power on the water pump 100 is added, so that experimenters can better understand the changes in the performance of the water pump 100 at different pressure levels, adjust and monitor the working status of the water pump 100 in real time, better control the experimental conditions, and use it more conveniently.

[0028] It should be noted that the specific models and specifications of the motor 110, rangefinder 140, electric slide 520, intelligent control sensor connector 540 and high-definition camera 530 need to be selected and determined based on the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0029] The power supply and principles of the motor 110 , the rangefinder 140 , the electric slide 520 , the intelligent control sensor connector 540 and the high-definition camera 530 are clear to those skilled in the art and will not be described in detail here.

[0030] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An experimental device for measuring cavitation of a water pump, comprising a water pump (100), a liquid storage tank (400) and an observation component (500), characterized in that: The water pump (100) comprises a motor (110) and a pump head (150); a tachometer (120) and a power meter (130) are mounted on the motor (110); the power meter (130) is located on one side of the tachometer (120); a distance meter (140) is mounted below the motor (110); and the pump head (150) is mounted at the output end of the motor (110); The pump head (150) is connected to a flow meter assembly (300) via a first connection portion (200); The observation assembly (500) comprises an upper transparent observation tube (510) and an electric slide (520); intelligent control sensor joints (540) are installed at both ends of the upper transparent observation tube (510); the electric slide (520) is installed on the intelligent control sensor joint (540); a high-definition camera (530) is installed on the electric slide (520); one of the intelligent control sensor joints (540) is installed with a flow guide pipe (560) via an elbow joint (550); the flow guide pipe (560) is connected to the liquid storage tank (400) via a pipe joint; and the other intelligent control sensor joint (540) is connected to the flow meter assembly (300) via an elbow (570); The liquid storage tank (400) is connected to the pump head (150) via a second connection portion (600).

2. The experimental device for measuring water pump cavitation according to claim 1, characterized in that: The first connection portion (200) comprises a water supply pipe (210), one end of the water supply pipe (210) being in communication with the pump head (150) via a pipe joint, and a water supply pressure gauge (220) and a water supply valve (230) being installed on the water supply pipe (210).

3. The experimental device for measuring water pump cavitation according to claim 2, characterized in that: The flow meter assembly (300) comprises a transparent inner tube (310) and a float (330); the bottom of the transparent inner tube (310) is in communication with the water supply pipe (210); scales (320) are fixed on both sides of the surface of the transparent inner tube (310); the float (330) floats inside the transparent inner tube (310); and the upper end of the transparent inner tube (310) is in communication with the curved pipe (570).

4. The experimental device for measuring water pump cavitation according to claim 1, characterized in that: The liquid storage tank (400) is formed with a main water inlet, on which a main water cover (410) is installed; the liquid storage tank (400) is formed with an air vent, on which an air vent valve (420) is installed; a drain port is formed at the bottom of the liquid storage tank (400), on which a drain valve (430) is installed; an air suction port is also formed on the liquid storage tank (400), on which an air suction member (440) is installed; and a transparent liquid level observation plate (401) is embedded on the surface of the liquid storage tank (400).

5. The experimental device for measuring water pump cavitation according to claim 4, characterized in that: The air extraction component (440) comprises an air extraction valve (441), an air extraction pump (442) and a vacuum pressure gauge (443); the air extraction valve (441) and the vacuum pressure gauge (443) are installed on the air extraction port; and the air inlet of the air extraction pump (442) is in communication with the air extraction valve (441).

6. The experimental device for measuring water pump cavitation according to claim 1, characterized in that: The second connecting portion (600) comprises a lower transparent observation tube (610), one end of the lower transparent observation tube (610) being in communication with the liquid storage tank (400), and the other end of the lower transparent observation tube (610) being in communication with the pump head (150) via a pipe joint, and a water pumping valve (620) and a water pumping pressure gauge (630) being installed on the lower transparent observation tube (610).

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