CN212300790U

CN212300790U - Water cavitation pressure measuring device

Info

Publication number: CN212300790U
Application number: CN202021885990.9U
Authority: CN
Inventors: 黄先北; 奚超男; 李楚凡; 顾世发; 肖颖
Original assignee: Yangzhou University
Current assignee: Yangzhou University
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2021-01-05
Anticipated expiration: 2030-09-02

Abstract

The utility model provides a water body cavitation pressure measuring device in the technical field of cavitation experiments, which comprises a box body, wherein a measuring cylinder body with a piston cavity is arranged in the box body, a connecting rod is connected on the box body right above the measuring cylinder body, the lower end of the connecting rod is connected with a dynamometer, the dynamometer is connected with a piston which downwards extends into the piston cavity and can move up and down in the piston cavity, a connecting pipe which extends out of the box body is connected on the measuring cylinder body below the piston, a switch valve is arranged on the connecting pipe, the bottom of the box body is connected with a camera, the camera can shoot the piston cavity, and a drain pipe which extends out of the box body is also arranged on the; the utility model discloses with low costs, area is little, cavitation experiment is effectual, can realize the visual teaching work of cavitation pressure test.

Description

Water cavitation pressure measuring device

Technical Field

The utility model belongs to the technical field of the cavitation experiment, in particular to water cavitation pressure measurement device.

Background

Cavitation is a liquid-specific dynamic phenomenon that occurs in regions of a liquid where the local pressure is below the saturation vapor pressure at that temperature. The operation of equipment such as water turbines, pump blades, propeller propellers of ships and the like is plagued by cavitation and cavitation erosion. Cavitation is one of the main problems affecting the service life and performance of fluid machinery, and can cause the reduction of mechanical efficiency, the aggravation of noise and vibration, and even cause the material degradation, the structural damage and the like of the blade.

The cavitation experiment device in the prior art generally needs large-scale equipment such as an annular water tunnel, liquid circulation is realized by a high-power pump, the water pressure is reduced by a vacuum pump, and finally cavitation is formed. Such experimental facilities have extremely many problems, and whole device area is big, the input cost is many, use and maintenance cost are high, and experimental facilities and structure are complicated moreover, are difficult to change the flowing medium, can't visual observation, influence cavitation experiment effect.

In the course of energy power, cavitation is a common phenomenon in hydraulic machinery, and the influence on the safe and stable operation of hydraulic machinery is obvious, and at present, to the research of cavitation, no matter numerical calculation or experimental research, cavitation pressure is the core parameter therein, therefore, the cavitation pressure measurement experimental apparatus that reduces experimental equipment cost, safe and effective and be convenient for the teacher to carry out the demonstration of the experiment with the hall urgently needs.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model discloses an aim at solves the weak point among the prior art, has solved among the prior art technical problem with high costs, area is big, cavitation experiment effect is poor, provides a water cavitation pressure measurement device, and this device is with low costs, area is little, cavitation experiment is effectual.

The purpose of the utility model is realized like this: the utility model provides a water cavitation pressure measurement device, includes the box, the internal measurement cylinder body that has the piston chamber that is equipped with of box, be connected with the connecting rod on the box directly over the measurement cylinder body, the lower extreme of connecting rod is connected with the dynamometer, be connected with the piston that downwardly stretches into the piston chamber and can reciprocate in the piston chamber on the dynamometer, be connected with the connecting pipe that stretches out the box body outside on the measurement cylinder body of piston below, be equipped with the ooff valve on the connecting pipe, the bottom of box is connected with the camera, the camera can make a video recording to the piston chamber, still be equipped with the drain pipe that stretches out the box body outside on the measurement cylinder body.

The utility model discloses carry out the during operation, open the on-off valve, water flows into the measurement cylinder body from the inlet tube, close the on-off valve after arriving the liquid level of settlement, open the camera and make it begin to carry out the video recording work, the connecting rod rebound, connecting rod pulling dynamometer, dynamometer pulling piston rebound along measuring the cylinder body inner wall, pressure in the measurement cylinder body reduces gradually, when pressure reduction to a definite value, aquatic products produce cavitation phenomenon and produce the bubble, at this moment, the camera records cavitation production process and catches cavitation phenomenon, when cavitation phenomenon is caught to the camera, the connecting rod stops moving, record the pulling force value on the dynamometer at this moment, can calculate the cavitation initial pressure value of water through the pulling force value, realize the pressure measurement and the teaching work of water cavitation, after the experiment, water after the test is discharged through the drain pipe; the utility model has the advantages of effective simulation of cavitation environment, low cost, small occupied area and good cavitation experiment effect by measuring the arrangement of the cylinder body and the piston; the camera can realize visual teaching and record cavitation in real time, and is convenient to use and good in observation effect; the arrangement of the dynamometer can calculate the cavitation initial pressure value by measuring the tension value, and the device is convenient to use and high in working efficiency; the visual teaching device can be applied to visual teaching work of cavitation pressure testing.

For the bubble that conveniently trails the production, be convenient for observe the record, be equipped with the connecting rod of outside extension on the connecting rod of measurement cylinder body top, the vertical slide bar that is equipped with on the connecting rod, be equipped with the mounting panel on the slide bar, the mounting panel is in the below of piston, be connected with laser instrument and convex lens on the mounting panel, convex lens is between laser instrument and measurement cylinder body, and the camera lens of laser instrument just aims at convex lens's center.

For the convenience of recording of the camera, a hollow upper bottom plate and a hollow lower bottom plate are arranged at the bottom of the box body, a transparent plate is arranged between the upper bottom plate and the lower bottom plate and is arranged under the piston, the measuring cylinder body is connected to the upper bottom plate, a connecting seat is connected to the bottom of the box body under the measuring cylinder body, the camera is installed on the connecting seat, and a lens of the camera is arranged under the transparent plate.

For the convenience of camera recording, the bottom of the box body is provided with a transparent bottom plate, the measuring cylinder body is connected to the transparent bottom plate, the lower side of the transparent bottom plate is connected with a connecting seat, the camera is installed on the connecting seat, and a lens of the camera is under the piston.

In order to detach the gas dissolved in water and improve the detection precision, one side of the box body is provided with a support frame, a heating cylinder is arranged on the support frame, the upper end of the heating cylinder is provided with a water inlet pipe and an exhaust pipe, a water inlet valve is arranged on the water inlet pipe, an exhaust valve is arranged on the exhaust pipe, the bottom of the heating cylinder is provided with an opening, the connecting pipe is connected to the heating cylinder through the opening, the inner wall of the heating cylinder is provided with at least one heater, and the upper end of the heating cylinder is further connected with a thermometer stretching into the.

As a further improvement, the box upper end is connected with the upper cover, it has the connector to cover to open on, it is equipped with the mount pad to cover the upper end, be equipped with the linear actuator on the mount pad, be equipped with on the linear actuator and measure the lifter of cylinder body at direction of height reciprocating motion, the connecting rod stretches out through the connector and measures the cylinder body and be connected with the lifter.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.

The device comprises a box body 1, an upper bottom plate 101, a lower bottom plate 102, an upper cover 103, a connecting port 103a, a mounting seat 104, a measuring cylinder 2, a connecting rod 3, a dynamometer 4, a piston 5, a connecting pipe 6, a transparent plate 7, a connecting rod 8, a sliding rod 801, a mounting plate 9, a laser 10, a convex lens 11, a support frame 12, a heating cylinder 13, a water inlet pipe 1301, an exhaust pipe 1302, a heater 14, a thermometer 15, a linear driver 16, a lifting rod 1601, a drain pipe 17, a drain valve 18, a switch valve 19, a display 20, a connecting seat 21, a transparent bottom plate 22 and a camera 23.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The water cavitation pressure measuring device shown in fig. 1-2 comprises a box body 1, a measuring cylinder 2 with a piston 5 cavity is arranged in the box body 1, an upper cover 103 is connected to the upper end of the box body 1, a connector 103a is arranged on the upper cover 103, a mounting seat 104 is arranged at the upper end of the upper cover 103, a linear actuator 16 is arranged on the mounting seat 104, a lifting rod 1601 capable of reciprocating in the height direction is arranged on the linear actuator 16, a connecting rod 3 is connected on the box body 1 right above the measuring cylinder 2, the connecting rod 3 extends out of the measuring cylinder 2 through the connector 103a and is connected with the lifting rod 1601, the lower end of the connecting rod 3 is connected with a dynamometer 4, the dynamometer 4 is connected with a piston 5 which extends downwards into the piston 5 cavity and can move upwards and downwards in the piston 5 cavity, a connecting pipe 6 extending out of the box body 1 is connected on the measuring cylinder 2 below the piston 5, a, the measuring cylinder is also provided with a display 20, a camera 23 is electrically connected with the display 20, the camera 23 can take a picture of the cavity of the piston 5, a drain pipe 17 extending out of the box body 1 is also arranged on the measuring cylinder body 2, and a drain valve 18 is arranged on the drain pipe 17; a connecting rod 8 extending outwards is arranged on the connecting rod 3 above the measuring cylinder 2, a sliding rod 801 is vertically arranged on the connecting rod 8, an installation plate 9 is arranged on the sliding rod 801, the installation plate 9 is arranged below the piston 5, a laser 10 and a convex lens 11 are connected onto the installation plate 9, the convex lens 11 is arranged between the laser 10 and the measuring cylinder 2, and the lens of the laser 10 is just aligned to the center of the convex lens 11; the bottom of the box body 1 is provided with a hollow upper bottom plate 101 and a hollow lower bottom plate 102, a transparent plate 7 is arranged between the upper bottom plate 101 and the lower bottom plate 102, the transparent plate 7 is arranged under the piston 5, the measuring cylinder body 2 is connected to the upper bottom plate 101, the bottom of the box body 1 under the measuring cylinder body 2 is connected with a connecting seat 21, the camera 23 is arranged on the connecting seat 21, and the lens of the camera 23 is arranged under the transparent plate 7; one side of the box body 1 is provided with a support frame 12, the support frame 12 is provided with a heating cylinder 13, the upper end of the heating cylinder 13 is provided with a water inlet pipe 1301 and an exhaust pipe 1302, the water inlet pipe 1301 is provided with a water inlet valve, the exhaust pipe 1302 is provided with an exhaust valve, the bottom of the heating cylinder 13 is provided with an opening, the connecting pipe 6 is connected to the heating cylinder 13 through the opening, the inner wall of the heating cylinder 13 is provided with at least one heater 14, and the upper end of the heating cylinder 13 is further connected with a thermometer 15.

In the utility model, the material of the measuring cylinder 2 is preferably organic glass, before the device works, the switch valve 19 is in a closed state, the water inlet valve is in an open state, the exhaust valve is in an open state, the drain valve 18 is in a closed state, when the device works, the water to be measured is injected into the heating cylinder 13 through the water inlet pipe 1301, the heater 14 heats the water to be measured, the gas dissolved in the water can be removed, the gas is discharged from the exhaust valve, the observation thermometer 15 is used for counting, a certain value is reached to indicate that the heating is completed, the exhaust valve and the water inlet valve are closed immediately, the water to be measured is cooled naturally, the thermometer 15 is observed, after the water temperature is reduced to the required temperature, the switch valve 19 is opened, the water to be measured enters the measuring cylinder 2 through the connecting pipe 6 to reach the set water level, the dynamometer 4 is opened and is, the lifting rod 1601 drives the connecting rod 3 to move upwards, the connecting rod 3 pulls the dynamometer 4, the dynamometer 4 pulls the piston 5 to move upwards along the inner wall of the measuring cylinder 2, the pressure in the measuring cylinder 2 is gradually reduced, when the pressure is reduced to a certain value, the water generates cavitation to generate bubbles, meanwhile, the infrared light beam emitted by the laser 10 is driven by the movement of the connecting rod 3 to irradiate onto the measuring water body in the measuring cylinder 2 through the convex lens 11 to track the generated bubbles, so that the observation and the recording are convenient, at the moment, the camera 23 records the cavitation generation process through the transparent plate 7 and captures the cavitation, a person can observe the cavitation from the display 20, stop the operation of the linear driver 16 immediately, record the tension value on the dynamometer 4 at the moment, the initial cavitation pressure value of the water can be calculated through the tension value, the pressure measurement and teaching work of the water body cavitation are realized, the water body to be measured continuously generates a, after the measurement is finished, the drain valve 18 is opened, the tested water is drained from the drain pipe 17, the camera 23 is closed, and meanwhile, the linear driver 16 is started to enable the piston 5 to return to the initial position, so that the next measurement experiment can be carried out; the arrangement of the cylinder body 2 and the piston 5 in the utility model can effectively simulate the cavitation environment, and has low cost, small occupied area and good cavitation experiment effect; the camera 23 and the display 20 are arranged, so that visual teaching can be realized, the cavitation phenomenon can be recorded in real time, the use is convenient, and the observation effect is good; the arrangement of the dynamometer 4 can calculate the cavitation initial pressure value by measuring the tension value, and has convenient use and high working efficiency; the visual teaching device can be applied to visual teaching work of cavitation pressure testing.

Example 2

As shown in fig. 3, the difference between this embodiment and embodiment 1 is that a transparent bottom plate 22 is arranged at the bottom of the tank 1, the measuring cylinder 2 is connected to the transparent bottom plate 22, a connecting seat 21 is connected to the lower side of the transparent bottom plate 22, a camera 23 is installed on the connecting seat 21, and a lens of the camera 23 is located right below the piston 5.

The present invention is not limited to the above-mentioned examples, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims

1. The utility model provides a water cavitation pressure measurement device, includes the box, the internal measurement cylinder body that has the piston chamber that is equipped with of box, be connected with the connecting rod on the box directly over the measurement cylinder body, the lower extreme of connecting rod is connected with the dynamometer, be connected with the piston that downwardly stretches into the piston chamber and can reciprocate in the piston chamber on the dynamometer, be connected with the connecting pipe that stretches out the box body outside on the measurement cylinder body of piston below, be equipped with the ooff valve on the connecting pipe, the bottom of box is connected with the camera, the camera can make a video recording to the piston chamber, still be equipped with the drain pipe that stretches out the box body outside on the measurement cylinder body.

2. The water body cavitation pressure measuring device according to claim 1, characterized in that: the utility model discloses a piston, including measuring cylinder body, be equipped with the connecting rod that outwards extends on the connecting rod of measurement cylinder body top, the vertical slide bar that is equipped with on the connecting rod, be equipped with the mounting panel on the slide bar, the mounting panel is in the below of piston, be connected with laser instrument and convex lens on the mounting panel, convex lens is between laser instrument and measurement cylinder body, and the center of convex lens is just aimed at to the camera lens of laser instrument.

3. The water body cavitation pressure measuring device according to claim 2, characterized in that: the bottom of box is equipped with and is hollow upper plate and lower plate, be equipped with the transparent plate between upper plate and the lower plate, the transparent plate is under the piston, measure the cylinder body and connect on the upper plate, the bottom half under the measurement cylinder body is connected with the connecting seat, the camera is installed on the connecting seat, and the camera lens of camera is under the transparent plate.

4. The water body cavitation pressure measuring device according to claim 2, characterized in that: the measuring cylinder is connected to the transparent bottom plate, a connecting seat is connected to the lower side of the transparent bottom plate, the camera is installed on the connecting seat, and a lens of the camera is located under the piston.

5. The water body cavitation pressure measuring device according to claim 3 or 4, characterized in that: one side of box is equipped with the support frame, be equipped with the heating jar on the support frame, the upper end of heating jar is equipped with inlet tube and blast pipe, is equipped with the water intaking valve on the inlet tube, be equipped with discharge valve on the blast pipe, the bottom of heating jar is equipped with the opening, the connecting pipe is connected on the heating jar through the opening, be equipped with at least one heater on the inner wall of heating jar, the upper end of heating jar still is connected with the thermometer that stretches into in the heating jar.

6. The water body cavitation pressure measuring device according to claim 1, characterized in that: the upper end of the box body is connected with an upper cover, a connector is arranged on the upper cover, a mounting seat is arranged at the upper end of the upper cover, a linear driver is arranged on the mounting seat, a lifting rod capable of moving in a height direction in a reciprocating mode is arranged on the linear driver, and the connecting rod extends out of the measuring cylinder body through the connector and is connected with the lifting rod.