CN201803832U - Test device for detecting valve leakage by acoustic emission signal - Google Patents

Abstract

The utility model discloses a tester using acoustic emission signals to detect valve leakage, which comprises a liquid storage tank, a pumping unit, a pressure stabilizer, a tested valve, a flow measurer and an acoustic emission detection sensor, the input end of the pumping unit is connected with the liquid storage tank, the output end of the pumping unit is connected with the pressure stabilizer, one end of the tested valve is connected with the pressure stabilizer through a duct, the other end of the tested valve is connected with the inlet of the flow measurer through a duct, the outlet of the flow measurer is communicated with the liquid storage tank, and the acoustic emission detection sensor is mounted on the tested valve. The tester can simulate the actual conditions when various valves are leaked, the characteristics of various acoustic emission signals can be conveniently observed, and the tester can meet the requirements of experiment teaching and experiment exploration.

Description

Test device for detecting valve leakage by acoustic emission signal

technical field

The utility model relates to test equipment in the field of testing the thermal system of a steam turbine unit, in particular to a test device for detecting valve leakage with acoustic emission signals.

Background technique

Most of the valves used in thermal power plants have to withstand high temperature and high pressure. If the valves leak internally, it will not only cause energy loss and reduce the efficiency of the unit, but also cause frequent failures in thermal power plants, posing a serious threat to the safety of equipment. If it is possible to carry out early on-line monitoring and diagnosis of valve leakage, predict the degree and development trend of leakage, and repair or replace valves in time, it can effectively prevent the occurrence of faults and avoid the expansion of accidents. Safety and economy of thermal power plant operation. The acoustic emission signal detection device is one of the online monitoring and diagnosis devices. In order to grasp the characteristics of the acoustic emission signal and its changing law of high temperature and high pressure valve leakage, it is necessary to carry out experiments and explorations on the valve leakage test bench.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, provide a device that can simulate the actual situation when various valves leak, facilitate the observation of various acoustic emission signal characteristics, and meet the requirements of experimental teaching and experimental exploration. Test device for detecting valve leaks using acoustic emission signals.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A test device for detecting valve leakage using acoustic emission signals, comprising a liquid storage tank, a pumping unit, a voltage stabilizer, a test valve, a flow measurement device and an acoustic emission detection sensor, the input end of the pumping unit is connected to the storage The liquid tank is connected, the output end of the pumping unit is connected to the pressure stabilizer, one end of the test valve is connected to the pressure stabilizer through a delivery pipe, and the other end is connected to the inlet of the flow measurement device through a delivery pipe. The outlet of the measuring device communicates with the liquid storage tank, and the acoustic emission detection sensor is installed on the test valve.

Damping washers are arranged between both ends of the test valve and the connected delivery pipe.

At least one of the delivery pipes at both ends of the test valve is equipped with an expansion joint.

A pipe seat is provided on the liquid storage tank, and the delivery pipe is supported and fixed by the pipe seat.

A damping ring is provided between the tube base and the delivery pipe.

An integrated communication block is installed on the delivery pipe between the test valve and the pressure regulator, and the integrated communication block is provided with an outlet and a plurality of inlets, the test valve communicates with the outlet of the integrated communication block, and the pressure stabilizing The device and the pumping unit are respectively communicated with an inlet of the integrated communication block, at least one inlet of the integrated communication block is connected with a gas source, and each inlet is controlled on and off by a valve.

The flow measurement device is a flow measuring weir or a metering container or a float type flowmeter.

A safety valve is connected between the pumping unit and the voltage stabilizer.

The top of the liquid storage tank is provided with a liquid injection port, the bottom of the liquid storage tank is provided with a discharge port, and the side of the liquid storage tank is provided with a liquid level gauge and a cover plate.

Compared with the prior art, the utility model has the advantages of:

The test device for detecting valve leakage with acoustic emission signals of the utility model can simulate the actual situation when various valves leak, and observe the characteristics of various acoustic emission signals (such as observing and testing different leakages of valves, different locations of leakage points, and different valve locations). Acoustic emission signal characteristics when the opening is different, observe the acoustic emission signal characteristics when the interference is small or large), provide a test platform for mastering the variation law of the acoustic emission signal characteristics of valve leakage, fully meet the requirements of experimental teaching and experimental exploration , and the device is simple in structure, easy to operate and easy to popularize. There are damping gaskets between both ends of the test valve and the connected delivery pipe. The damping gaskets can reduce mechanical noise interference and reduce the influence of the outside of the test valve on the acoustic emission detection sensor. Remove the damping washer. An expansion joint is installed on the delivery pipe, through which the test valve can be easily disassembled, and a variety of test valves of different sizes can be installed, which makes the types of tested valves more abundant and the fault simulation ability stronger. The conveying pipe is supported and fixed by the pipe seat, and a damping ring is arranged between the pipe seat and the conveying pipe, which can prevent external interference from being transmitted to the test valve through the conveying pipe, so that the test device of the utility model has higher anti-interference ability. An integrated connection block is installed on the delivery pipe between the test valve and the regulator, through which the gas source (such as compressed air, steam) can be passed through the gas source, the regulator can be used for water supply, and the pumping unit can be used for water supply , can further improve the simulation ability of the test device. The flow measurement device is a flow measuring weir or a metering container or a float type flowmeter. The specific type of flow measurement device can be selected according to the flow rate. By replacing different flowmeters, the characteristics of the acoustic emission signal when the leakage volume changes can be observed. There is a safety valve connected between the pumping unit and the pressure regulator. By adjusting the trigger pressure of the safety valve, the characteristics of the acoustic emission signal when the pressure changes can be observed. There is a liquid injection port on the top of the liquid storage tank through which water or hydraulic oil can be added to the liquid storage tank. There is a discharge port at the bottom of the liquid storage tank. When maintenance is required, the liquid storage tank can be emptied from the discharge port to store liquid. A liquid level gauge and a cover plate are installed on the side of the tank. The liquid level in the liquid storage tank can be observed through the liquid level gauge. There is a filter screen for filtering the returning liquid.

Description of drawings

Fig. 1 is the front view structural representation of the utility model;

Fig. 2 is the top view structural representation of the utility model;

Fig. 3 is a left view structural representation of the utility model;

Fig. 4 is a schematic diagram of the hydraulic system of the present invention.

Each label in the figure means:

1. Liquid storage tank; 2. Pumping unit; 3. Voltage stabilizer; 4. Delivery pipe; 5. Test valve; 6. Flow measurement device; 7. Acoustic emission detection sensor; 8. Damping washer; 9. Expansion joint ;10. Damping ring; 11. Integrated connection block; 12. Liquid injection port; 13. Discharge port; 14. Liquid level gauge; 15. Cover plate; 16. Flow measuring weir; 19. Safety valve; 20. Air source; 21. Filter screen; 22. Tube holder.

Detailed ways

Fig. 1 to Fig. 4 have shown a kind of test device that detects the leakage of valve with acoustic emission signal of the present utility model, comprise liquid storage tank 1, pumping unit 2, voltage stabilizer 3, test valve 5, flow measuring device 6 and Acoustic emission detection sensor 7, the input end of the pumping unit 2 is connected to the liquid storage tank 1, the output end of the pumping unit 2 is connected to the voltage stabilizer 3, one end of the test valve 5 is connected to the voltage stabilizer 3 through the delivery pipe 4, and the other One end is connected to the inlet of the flow measurement device 6 through the delivery pipe 4 , and the outlet of the flow measurement device 6 is connected to the liquid storage tank 1 , and other communication lines except the delivery pipe 4 are arranged in the liquid storage tank 1 . The acoustic emission detection sensor 7 is installed on the test valve 5 . The liquid storage tank 1 can be filled with water or hydraulic oil, and this embodiment takes water storage as an example for illustration. When using this test device, first send the water in the liquid storage tank 1 to the regulator 3 through the pumping unit 2, stop the operation of the pumping unit 2 before starting the detection work, and maintain the water pressure by the regulator 3, so as to Reduce the electromagnetic interference of the motor and the mechanical rubbing interference of the pump, so that you can observe the characteristics of the acoustic emission signal when the interference is small; you can also observe the characteristics of the acoustic emission signal when the pumping unit 2 is turned on when the interference is large; you can also observe Test the acoustic emission signal characteristics of the valve 5 when the leakage amount is different, the location of the leakage point is different, and the valve opening is different. It can be seen that the test device for detecting valve leakage using acoustic emission signals of the utility model can simulate the actual situation of various valve leakages, and provides a test platform for mastering the characteristics of acoustic emission signal changes of valve leakage, fully meeting the requirements of experimental teaching and experimental exploration Requirements, and the device is simple in structure, easy to operate and easy to popularize.

In this embodiment, a damping washer 8 is provided between both ends of the test valve 5 and the connected delivery pipe 4. The damping washer 8 is made of non-metallic material (such as epoxy resin), which can reduce mechanical noise interference and reduce test The influence of the outside of the valve 5 on the acoustic emission detection sensor 7, the damping washer 8 can be removed when testing under the condition of large interference, and the damping bolt sleeve can also be made of the same material, and the damping bolt sleeve can be used to connect The test valve 5 and the bolts on the flange of the delivery pipe 4 prevent external interference from being transmitted to the test valve 5 through the delivery pipe 4 and the bolts. At least one of the delivery pipes 4 at the two ends of the test valve 5 is equipped with a telescopic joint 9. In this embodiment, the telescopic joint 9 is installed on the delivery pipe 4 connected to the flow measuring device 6. The telescopic joint 9 can be very The test valve 5 is conveniently disassembled, and various test valves 5 of different sizes can be installed, so that the types of the tested valves are richer and the failure simulation capability is stronger. In this embodiment, the liquid storage tank 1 is provided with a pipe seat 22, and the delivery pipe 4 is supported and fixed by the pipe seat 22. A damping ring 10 is provided between the pipe seat 22 and the delivery pipe 4, so as to avoid the transmission of external interference through the delivery pipe 4. Give test valve 5, make the test device of the present utility model have higher anti-interference ability. An integrated communication block 11 is installed on the delivery pipe 4 between the test valve 5 and the voltage stabilizer 3. The integrated communication block 11 is provided with an outlet and multiple inlets. In this embodiment, there are three inlets of the integrated communication block 11. One of the inlets is connected to the gas source 20, one inlet is connected to the pressure regulator 3, and the other inlet is connected to the pumping unit 2, the outlet of the integrated communication block 11 is connected to the test valve 5, and the three inlets are respectively controlled on and off by a valve, so that 20 gas sources (such as steam, in the teaching experiment, for safety reasons, a compressed air system composed of a screw air compressor and an air storage tank can be used to simulate a high-temperature and high-pressure steam system), and a single voltage regulator 3 Water supply, water supply with pumping unit 2 alone, further improve the simulation ability of this test device, in addition to the structure described in this embodiment, the integrated connection block 11 can also add more inlets, so as to connect more pressure supply equipment according to actual needs (like connecting multiple voltage regulators3). A pressure gauge can also be set between the integrated communication block 11 and the test valve 5 for measuring the hydraulic pressure or air pressure before the test valve 5 . The flow measuring device 6 is a flow measuring weir 16 or a metering container or a float type flowmeter. In this embodiment, the flow measuring weir 16 is used, and the specific type of the flow measuring device 6 can be selected according to the flow rate. When the acoustic emission detection time is long, When the flow rate is large and there is a free water surface (open channel flow), the flow measuring weir 16 is used for measurement; when the acoustic emission detection time is short and the flow rate is small, the volumetric method is used for measurement, and the metering container is selected as the flow measurement device 6 at this time; When the pipe is large and full (pressurized pipe flow), a float type flowmeter is used as the flow measurement device. By changing different flowmeters, the characteristics of the acoustic emission signal when the leakage volume changes can be observed. A safety valve 19 is connected between the pumping unit 2 and the voltage regulator 3 , and by adjusting the trigger pressure of the safety valve 19 , the characteristics of the acoustic emission signal when the pressure changes can be observed. The top of the liquid storage tank 1 is provided with a liquid injection port 12, through which water or hydraulic oil can be added to the liquid storage tank 1, and the bottom of the liquid storage tank 1 is provided with a discharge port 13, and the storage tank can be drained from the discharge port 13 when maintenance is required. The liquid tank 1 is emptied, and a liquid level gauge 14 and a cover plate 15 are installed on the side of the liquid storage tank 1. The liquid level in the liquid storage tank 1 can be observed through the liquid level gauge. After the liquid storage tank 1 is emptied, the cover plate 15 is opened The interior of the liquid storage tank 1 can be inspected and repaired, and the liquid storage tank 1 is provided with a filter screen 21 for filtering the liquid that flows back.

The above are only preferred embodiments of the utility model, and do not limit the utility model in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model, or modify it into an equivalent change, etc. effective example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical proposal of the present invention.

Claims (10)

1. test unit that detects valve leak with acoustic emission signal, it is characterized in that: comprise liquid reserve tank (1), pumping unit (2), voltage stabilizer (3), test valve (5), flow measurement device (6) and acoustic emission detecting sensor (7), the input end of described pumping unit (2) is connected with described liquid reserve tank (1), the output terminal of pumping unit (2) is connected with described voltage stabilizer (3), described test valve (5) one ends are connected with voltage stabilizer (3) by delivery pipe (4), the other end is connected with the inlet of described flow measurement device (6) by delivery pipe (4), the outlet of described flow measurement device (6) is communicated with liquid reserve tank (1), and described acoustic emission detection sensor (7) is installed on the test valve (5).

2. according to claim 1ly detect the test unit of valve leak, it is characterized in that with acoustic emission signal: described test valve (5) two ends and connect and be equipped with damping washer (8) between the delivery pipe (4).

3. the test unit with acoustic emission signal detection valve leak according to claim 1 and 2 is characterized in that: be equiped with telescopic joint (9) at least one the delivery pipe (4) in the delivery pipe (4) at described test valve (5) two ends.

4. the test unit with acoustic emission signal detection valve leak according to claim 1 and 2, it is characterized in that: described liquid reserve tank (1) is provided with base (22), and described delivery pipe (4) is fixing by base (22) supporting.

5. the test unit with acoustic emission signal detection valve leak according to claim 3, it is characterized in that: described liquid reserve tank (1) is provided with base (22), and described delivery pipe (4) is fixing by base (22) supporting.

6. the test unit with acoustic emission signal detection valve leak according to claim 5 is characterized in that: be provided with damping ring (10) between described base (22) and the described delivery pipe (4).

7. the test unit that detects valve leak with acoustic emission signal according to claim 6, it is characterized in that: be equiped with the integrated piece (11) that is communicated with on the delivery pipe (4) between described test valve (5) and the voltage stabilizer (3), described integrated connection piece (11) is provided with an outlet and a plurality of inlet, described test valve (5) is communicated with the integrated outlet that is communicated with piece (11), described voltage stabilizer (3) and pumping unit (2) are communicated with an integrated inlet that is communicated with piece (11) respectively, described integrated connection piece (11) has at least an inlet to be connected with source of the gas (20), and each inlet is respectively by a valve control break-make.

8. the test unit with acoustic emission signal detection valve leak according to claim 7, it is characterized in that: described flow measurement device (6) is flow gaging weir (16) or measuring container or float type flow meter.

9. the test unit with acoustic emission signal detection valve leak according to claim 8 is characterized in that: be connected with safety valve (19) between described pumping unit (2) and the described voltage stabilizer (3).

10. the test unit that detects valve leak with acoustic emission signal according to claim 9, it is characterized in that: described liquid reserve tank (1) top is provided with liquid injection port (12), liquid reserve tank (1) bottom is provided with escape hole (13), liquid reserve tank (1) side is equiped with liquid level gauge (14) and cover plate (15), is provided with filter screen (21) in the liquid reserve tank (1).

Images