Device for automatically testing performance parameters of central gulp valve of mixed-flow water turbine

Abstract

The utility model discloses an automatic performance parameter testing device for a central gulp valve of a mixed-flow water turbine. A servo electric cylinder is fixed on a bottom plate, and a tension sensor is fixed at the upper end of a telescopic rod through an upper disc and a lower disc; the electromagnet is fixed on the tension sensor through the magnetic isolation upper disc and the magnetic isolation bottom disc; the laser distance measuring sensor is fixed on the inner wall of the supporting cylinder through a support and a support, the proximity switch is fixed on the edge of the magnetism isolating upper disc, and the magnet sucker is fixed below the valve disc. The servo electric cylinder, the laser distance measuring sensor, the tension sensor, the proximity switch and the electromagnet penetrate through a wire passing hole through a control cable with a spiral telescopic joint and are connected into a control box with a digital display panel and a power cable. And the gulp valve is fixed on the supporting cylinder through a valve seat. The technical scheme disclosed by the utility model can be widely applied to the field of mixed-flow water turbine center gulp valve parameter and performance testing.

Description

TECHNICAL FIELD

[0001] The present application is a device for automatically testing the parameters and performance of a mixed-flow water turbine center air supply valve and a vacuum breaking valve of a propeller water turbine. BACKGROUND

[0002] Currently, the prior art solution for testing the parameters and performance of a mixed-flow water turbine center air supply valve (hereinafter referred to as an air supply valve) and a vacuum breaking valve of a propeller water turbine is not only very tedious and labor-intensive, but also has a large testing error. The main performance test for the air supply valve is the cushioning performance, and the main parameter test for the air supply valve is the initial air supply vacuum aMpa, which generally corresponds to a pulling force of 500N or more, equivalent to 50kg; the maximum air supply vacuum bMpa, which generally corresponds to a pulling force of 8000N or more, equivalent to 800kg; the air supply valve stroke L is designed in the range of 100-200mm; and the cushioning closing time is in the range of 5-20 seconds. Currently, the testing method is to hang a weight at the lower end of the air supply valve to test the initial air supply vacuum of the air supply valve, and to hang a weight of 50kg or more on the valve disc; to test the maximum air supply vacuum of the air supply valve, and to hang a weight of 800kg or more on the valve disc, and then to observe whether the stroke L meets the corresponding design requirements. Through these manual tests, it is checked whether these parameters of the air supply valve meet the design requirements. Hanging a weight is not only labor-intensive and labor-intensive, but also very dangerous. It is even more difficult to test the cushioning effect, and the cushioning time of the air supply valve cannot be accurately tested, and only the cushioning time can be visually evaluated. This will bring certain hidden dangers to the stable operation of the mixed-flow water turbine. Therefore, there is an urgent need for a device for automatically testing the parameters and performance of a mixed-flow water turbine center air supply valve and a vacuum breaking valve of a propeller water turbine in the hydropower plant. SUMMARY

[0003] The technical scheme provided by the application can fully meet the technical requirements of automatically testing the performance and parameters of the center air supplement valve of the mixed flow water turbine. The main technical features are as follows: the air supplement valve is installed on the device; the servo electric cylinder is fixed on the bottom plate with a ground corner through the base, the joint hole and the screw hole by bolts; the lower disc is fixed on the end of the telescopic rod by the joint hole and the screw hole through the inner hexagonal bolt; the upper disc is fixed below the tension sensor by the joint hole and the screw hole through the inner hexagonal bolt; the upper disc and the lower disc are fixed together by the joint hole through the bolts; the magnetic separation bottom disc is fixed above the tension sensor through the joint hole and the screw hole by the inner hexagonal bolt; the electromagnet is fixed above the magnetic separation upper disc through the joint hole and the screw hole by the inner hexagonal bolt; the magnetic separation upper disc and the magnetic separation bottom disc are fixed together through the joint hole and the screw hole by the bolts; the proximity switch is fixed on the edge of the magnetic separation upper disc by the bolts; the support is fixed on the inner wall of the supporting cylinder through the support by the bolts; the laser ranging sensor is fixed on the end of the support; the laser ranging sensor is opposite to the valve disc; the supporting cylinder with the wire hole is fixed on the bottom plate through the joint hole on the lower end flange by the bolts; the servo electric cylinder, the laser ranging sensor, the tension sensor, the proximity switch and the electromagnet are connected to the control box with the digital display panel through the control cable with the spiral telescopic joint and the wire hole; the control box is provided with the power cable and the time timer; the magnet suction disc is fixed on the center position below the valve disc through the joint hole and the screw hole by the inner hexagonal bolt; the air supplement valve is fixed on the upper end flange of the supporting cylinder through the joint hole on the valve seat by the bolts.

[0004] The basic principle of the air supplement valve is as follows: when the water turbine generates a vacuum area, the vacuum degree of the vacuum area will suck the valve disc of the air supplement valve open, the suction force of the vacuum degree on the valve disc is equal to the area of the valve disc multiplied by the vacuum degree value, so that air is supplemented into the water turbine vacuum area through the air supplement valve to avoid harmful vibration of the vacuum area to the water turbine; after the air supplement valve completes air supplement, the valve disc is quickly closed under the action of the spring inside the air supplement valve, and the closing must be buffered, and the buffering time indicates the good or bad of the buffering effect. The vacuum degree of the vacuum area generated by the water turbine during operation is different, and the range of the vacuum degree is generally: 0.001Mpa~0.03Mpa. 0.001Mpa is the initial vacuum degree, under the action of the initial vacuum degree, the air supplement valve is opened by 1~5mm, that is, the distance between the valve disc and the valve port is 1~5mm, and the suction force of the vacuum degree of the vacuum area on the valve disc of the air supplement valve is generally 500N, that is, about 50kg; 0.03Mpa is the maximum vacuum degree, and the suction force of the maximum vacuum degree of the vacuum area on the valve disc of the air supplement valve is generally 8000N, that is, about 800kg; the stroke of the air supplement valve corresponding to the maximum vacuum degree is generally 100~200mm; the buffering closing time of the air supplement valve is generally 3~20 seconds. The opening process of the valve disc is the compression process of the spring, and the greater the stroke of the valve disc, the greater the elastic potential energy formed by the compression of the spring. The effective pulling force of the servo electric cylinder is greater than or equal to 1000kg, the magnetic attraction force of the electromagnet is greater than or equal to 1000kg, which fully meets the test requirements of the air supplement valve; the laser ranging sensor meets the measurement stroke L of the air supplement valve; the tension sensor meets the maximum tension requirement. The digital display panel displays all the parameters required to test the air supplement valve, the time timer in the control box counts the time used for opening to closing of the valve disc, and the time counted by the time timer is the buffering time and is displayed on the digital display panel.

[0005] The technical effect achieved by the technical scheme provided by the application is as follows: first, the tension corresponding to the starting vacuum degree of the test air supplement valve is tested: the magnet suction plate is fixed under the valve disc of the air supplement valve, and the air supplement valve is fixed on the upper flange of the supporting cylinder of the device. The test button is started, the servo electric cylinder works, the telescopic rod with the tension sensor and the electromagnet rises, when the proximity switch reaches the set distance from the lower surface of the valve disc, the proximity switch sends the electromagnet in-place signal to the control box, that is, the distance between the electromagnet and the magnet suction plate is zero, that is, the upper surface of the electromagnet contacts the lower surface of the magnet suction plate, at this time the control box sends the work signal of stopping upward movement to the servo electric cylinder, and the electromagnet is powered on to generate a strong magnetic attraction; the strong magnetic attraction generated by the electromagnet attracts the magnet suction plate. The control box sends the downward movement instruction to the servo electric cylinder, that is, the telescopic rod with the tension sensor, the electromagnet and the valve disc move downward. In this process, the telescopic rod moves downward by 1-5 mm, the telescopic rod moves downward by 1-5 mm through the tension sensor, the electromagnet and the magnet suction plate, and the valve disc is compressed by 1-5 mm. Therefore, the tension transducer input control box tension value increases continuously, and the display is displayed on the digital display panel. When the display value of the tension sensor reaches the set tension threshold value corresponding to the starting vacuum degree, the starting tension threshold value is generally 500N, that is, about 50kg, which indicates that the starting vacuum degree of the tested air supplement valve meets the design requirements; the opening of 1-5mm is monitored by the laser ranging sensor and displayed on the digital display panel of the control box. If the reading of the tension sensor has reached the design value, and the opening of the valve disc is zero or greater than 5mm, the starting vacuum degree is adjusted according to the "instruction manual" of the air supplement valve, and the test is performed again according to the above steps until the design requirements are met. The relationship between the tension reading F read by the tension sensor and the air supplement vacuum degree x Mpa of the air supplement valve is: F=Sx x Mpa, the vacuum degree range x Mpa is a Mpa-b Mpa; the maximum tension F corresponding to the maximum vacuum degree b Mpa is determined by the starting air supplement vacuum degree a Mpa of the air supplement valve, the elastic coefficient of the spring and the valve disc stroke. Therefore, the tension F corresponding to the starting air supplement vacuum degree a Mpa of the tested air supplement valve must be accurate, so as to ensure that the tension F corresponding to the maximum air supplement vacuum degree b Mpa is within the range of design requirements. The steps of the device for testing the tension of the maximum vacuum degree of the air supplement valve: the maximum air supplement vacuum degree of the air supplement valve should correspond to the maximum stroke of the valve disc.When the initial vacuum degree of the tested air supplement valve meets the design requirements, the control box continues to send a downward signal to the servo cylinder, and the telescopic rod with the tension sensor and the electromagnet moves downward, the electromagnet moves the valve disc downward through the magnet suction cup, the valve disc compresses the spring, the greater the travel of the valve disc, the greater the spring force after compression, the greater the spring potential energy, and the greater the data transmitted by the tension sensor to the digital panel of the control box, when the data reaches the maximum tension range required by the design, and the travel of the valve disc also meets the travel corresponding to the maximum tension, the maximum vacuum degree and the travel of the tested air supplement valve meet the design requirements, the maximum travel of the valve disc is monitored by the laser ranging sensor and provided to the control box, and is displayed in real time. When the initial vacuum degree aMPa, the maximum air supplement vacuum degree bMPa, and the travel L all meet the design requirements, the buffer performance and the buffer time of the air supplement valve are tested, mainly the buffer time. The test of the buffer time of the present application is realized as follows: when the telescopic rod on the servo cylinder pulls the valve disc downward to the maximum travel position through the tension sensor, the electromagnet and the magnet suction cup, which is also the maximum position of the air supplement valve tension, under the correct technical conditions, the control box sends a power-off demagnetization instruction to the electromagnet, the electromagnet immediately releases the magnet suction cup, thereby releasing the valve disc, and the valve disc immediately moves upward under the action of the spring and enters the buffer state, the buffer effect is mainly reflected in the buffer time. At the same time that the control box sends the power-off demagnetization instruction to the electromagnet, the time timer in the control box starts working, when the laser ranging sensor returns to zero in the travel value during the valve disc buffer closing, the time timer stops working. The time timer starts counting from the power-off demagnetization of the electromagnet, which is T. The longer the buffer time T, the better the buffer effect of the air supplement valve. The buffer time can be adjusted within 3-30 seconds according to the needs of the unit, as long as the buffer time meets the design requirements or the use requirements, the buffer time of the tested air supplement valve is tested for different travels, the smaller the travel, the shorter the buffer time, as long as it meets the different buffer time corresponding to different travels.

[0006] If the maximum degree of the tested air supply valve and the designed valve disc maximum stroke do not match, the control box sends a rising command to the servo electric cylinder, so that the valve disc returns to the starting state from the maximum stroke position, that is, the valve disc is in the closed state. Then according to the spring adjustment in the air supply valve "instruction manual", the spring is adjusted so that the maximum air supply vacuum degree corresponds to the maximum tension F that meets the maximum design stroke or tries to make the maximum stroke meet the maximum tension F within the required range. After the maximum air supply vacuum degree corresponding to the maximum tension is adjusted according to the "instruction manual", the test is carried out according to the foregoing test steps of the maximum air supply vacuum degree, until the maximum stroke of the air supply valve meets the design range requirement, and the maximum tension corresponding to the maximum air supply vacuum degree is within the design requirement range. Under this premise, the electromagnetic iron can be powered off at the maximum stroke position of the valve disc to test the buffer time and buffer performance. The technical scheme disclosed by the device can not only display all the test parameters and performance of the tested air supply valve on the digital display panel, but also can print and query the history of these parameters. The specification only discloses one of the technical schemes of the application. According to the disclosed content of the application, other technical schemes obtained by ordinary technical personnel in the art without creative labor are within the protection scope of the application.

[0007] The technical scheme disclosed by the application perfectly solves the technical problems of large labor intensity, danger in the test process and inaccurate test data of the air supply valve. Compared with the prior art, the technical scheme has novelty, creativity and practicality. The design idea of the scheme is ingenious, the structure is simple, the practicality is strong, the automation is high, and the man-machine interface is good, so it will be widely used in the test field of the air supply valve of the mixed flow type water turbine. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 . The main view of the automatic test device for performance parameters of the mixed flow type water turbine center air supply valve

[0009] Among them:

[0010] 1, bottom plate 2, base 3, bolt

[0011] 4, handle hole 5, servo electric cylinder 6, ground angle

[0012] 7, flange 8, support cylinder 9, telescopic rod

[0013] 10, inner hexagonal bolt 11, support 12, support

[0014] 13, laser ranging sensor 14, tension sensor 15, magnetic isolation bottom disc

[0015] 16, magnetic isolation upper disc 17, valve seat 18, proximity switch

[0016] 19, air supply valve 20, power cable 21, control box

[0017] 22, digital display panel 23, valve disc 24, magnet chuck

[0018] 25, electromagnet 26, screw telescopic joint 27, control cable

[0019] 28, wire passing hole 29, upper disc 30, lower disc

[0020] 31, screw hole DETAILED DESCRIPTION

[0021] The servo motor cylinder 5 is fixed on the bottom plate 1 with the ground corner 6 through the screw bolt 3 and the screw hole 31 on the base 2. The lower disc 30 is fixed on the telescopic rod 9 through the screw bolt 10 and the screw hole 31 on the end of the telescopic rod 9. The tensile sensor 14 is fixed on the upper disc 29 through the screw bolt 3 and the screw hole 31 on the upper disc 29. The upper disc 29 and the lower disc 30 are fixed together through the screw bolt 3 and the screw hole 31. The tensile sensor 14 is fixed under the magnetic separation lower disc 15 through the screw bolt 10 and the screw hole 31. The magnetic separation upper disc 16 is fixed under the electromagnet 25 through the screw bolt 10 and the screw hole 31. The magnetic separation upper disc 16 and the magnetic separation lower disc 15 are fixed together through the screw bolt 3 and the screw hole 31. The laser ranging sensor 13 is fixed on the inner wall of the supporting cylinder 8 with the wire passing hole 28 through the bracket 11 and the support 12. The proximity switch 18 is fixed on the edge of the magnetic separation upper disc 16 through the screw bolt 3. The supporting cylinder 8 is fixed on the bottom plate 1 through the flange 7 at the lower end of the supporting cylinder 8 with the screw bolt 3. The servo motor cylinder 5, the laser ranging sensor 13, the tensile sensor 14, the proximity switch 18 and the electromagnet 25 are connected to the control box 21 with the digital display panel 22 and the power cable 20 through the control cable 27 with the screw telescopic joint 26 and the wire passing hole 28. The magnet chuck 24 is fixed on the center of the valve disc 23 through the screw bolt 3 and the screw hole 31. The air supply valve 19 is fixed on the flange 7 at the upper end of the supporting cylinder 8 through the screw bolt 3 and the screw hole 31 on the valve seat 17. The implementation is completed.

Claims

1. An automatic testing device for the performance parameters of the central air-making valve of a mixed-flow turbine, wherein the air-making valve is installed on the device, characterized in that... The servo electric cylinder is bolted to a base plate with a base plate using a base, engagement hole, and screw hole. The lower plate is fixed to the end of the telescopic rod using hexagonal bolts through the engagement hole and screw hole. The upper plate is fixed to the bottom of the tension sensor using hexagonal bolts through the engagement hole and screw hole. The upper and lower plates are then fixed together using bolts through the engagement hole. The magnetic shielding base is fixed to the tension sensor using hexagonal bolts through the engagement hole and screw hole. The electromagnet is fixed to the magnetic shielding upper plate using hexagonal bolts through the engagement hole and screw hole. The magnetic shielding upper plate and magnetic shielding base are then fixed together using bolts through the engagement hole and screw hole. The proximity switch is bolted to the upper edge of the magnetic shielding upper plate. The bracket is bolted to the support. A laser rangefinder is fixed to the inner wall of the support cylinder and to the upper end of the bracket. The laser rangefinder faces the valve disc. The support cylinder with a cable pass-through hole is bolted to the base plate through the engagement hole on the lower flange. The servo electric cylinder, laser rangefinder, tension sensor, proximity switch, and electromagnet are connected to the control box with a digital display panel through a control cable with a spiral expansion joint and a cable pass-through hole. The control box has a power cable and a timer. The magnetic chuck is fixed to the center position under the valve disc with hexagonal bolts through the engagement hole and screw hole. The air supply valve is fixed to the upper flange of the support cylinder with bolts through the engagement hole on the valve seat.

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