Friction torque testing device for movable guide vane connecting plate of water turbine

Abstract

The utility model relates to a friction torque testing device for a movable guide vane connecting plate of a water turbine. The device is composed of a basic support plate, a test platform, a top block, a movable guide vane arm, a hydraulic jack, a pressure sensor, a support plate, a friction bushing, a tool shaft, a clamping bolt, a clamping nut, a connecting hole, a shear pin, a positioning hole, a bottom plate, an oil pipe and a data acquisition line. The device can be used for measuring and calculating the friction torque between the friction bushing and the connecting plate after the shear pin is broken when the water guide mechanism works, so as to judge whether the friction torque can reach a design value or not, and can accurately simulate the stress state of the actual operation condition of a power station, thereby providing more accurate technical guarantee for the safe operation of the power station.

Description

Technical field:

[0001] The utility model relates to the field of water turbines, in particular to a friction torque test device for a water turbine movable guide vane connecting plate. Background technology:

[0002] The protective device of the water guide mechanism of the turbine mostly adopts a shear pin structure, and its purpose is to protect other parts of the water guide mechanism of the unit from being damaged when the external load suddenly increases. The commonly used method for the stress condition of the shear pin is the numerical calculation method, which lacks the simulation test data of the prototype. The shear value of the shear pin mostly comes from the shear force test conducted in the laboratory. Therefore, it is necessary to take the prototype as the research object, simulate the actual working state of the water guide mechanism in proportion, and measure and calculate the friction torque value between the friction bushing and the connecting plate after the shear pin breaks. This test can also be carried out in the manufacturer to simulate the actual working condition when the shear pin of the water guide component is sheared when the water guide mechanism of the unit is working. The components subjected to the simulation test mainly include movable guide vanes, movable guide vane arms, connecting plates and other related water guide mechanism connection components. During the test, the simulated test value obtained by the test is compared with the theoretical calculation value to determine whether the friction torque between the friction bushing and the connecting plate can reach the design value, so as to verify the accuracy of the friction torque design of the water guide mechanism of the unit.

[0003] The utility model discloses a friction torque test device for a turbine movable guide vane connecting plate, which can accurately simulate the stress condition of the actual operation state of the water guide mechanism of a power station unit and accurately obtain the real value of the friction torque, so as to provide accurate and reliable technical guarantee for the safe operation of the power station. Summary of the invention:

[0004] The purpose of the utility model is to provide a friction torque test device for a movable guide vane connecting plate of a water turbine, which can simulate the measurement and calculation of the friction torque between the friction bushing and the connecting plate after the shear pin breaks when the water guide mechanism is working, so as to determine whether the friction torque can reach the design value. The technical scheme is composed of a basic support plate, a test platform, a top block, a movable guide vane arm, a hydraulic jack, a pressure sensor, a support plate, a friction bushing, a tool shaft, a clamping bolt, a clamping nut, a connecting hole, a shear pin, a positioning hole, a bottom plate, an oil pipe and a data acquisition line. The basic support plate is fixed to the test platform with bolts, one side of the top block presses the basic support plate, the other side of the top block is pressed against one side of the movable guide vane arm, the other side of the movable guide vane arm is pressed against the hydraulic jack, the back of the hydraulic jack is pressed against the pressure sensor, and the back of the pressure sensor is pressed against the pressure sensor. The movable guide vane arm is pressed with a support plate, and is heat-shrink-fitted on the tool shaft. The friction bushing is clamped and installed above the movable guide vane arm. A clamping bolt is installed at one end of the friction bushing and clamped with a clamping nut. A connecting hole is machined at the other end of the friction bushing. The movable guide vane arm and the friction bushing are connected with a shear pin. The hydraulic jack and the pressure sensor are installed above the base plate. The hydraulic jack is connected to the pressure pump with an oil pipe, and the pressure sensor is connected to the pressure acquisition instrument with a data acquisition line. After the overall assembly is completed, a friction torque test device for the movable guide vane connecting plate of a turbine is formed.

[0005] In the above-mentioned turbine movable guide vane connecting plate friction torque test device, four positioning holes are machined evenly distributed around the upper part of the tool shaft.

[0006] Compared with other turbine movable guide vane connecting plate friction torque test devices, the utility model has the advantages of high accuracy and reliability of test data, simple and convenient installation and operation, and can effectively simulate the measurement and calculation of the friction torque between the friction bushing and the connecting plate after the shear pin breaks when the water guide mechanism is working, so as to determine whether the friction torque can reach the design value.

[0007] Working principle:

[0008] According to the test layout, the tool shaft, guide vane arm, connecting plate, shear pin, clamping bolt and clamping nut are assembled, and the clamping bolt and clamping nut are tightened with the design value of preload and preload torque. The external force is applied by the jack on one side of the connecting plate, and the change of the value of the end face of the connecting plate is monitored by the dial indicator on the other side. As the pressure gradually increases, until the connecting plate produces displacement, it is determined that the guide vane arm and the connecting plate have overcome the friction force and moved. At this time, the value of the pressure gauge is recorded to measure the friction torque of the friction shaft liner. This test uses an oil pump to pressurize the jack, and records the pressure value of the pressure gauge at the outlet of the oil pump. According to the specifications of the jack, the oil pressure action area of ​​the jack is found, and the support force of the jack is obtained by calculation. The recorded pressure value is compared with the theoretical calculated value to determine whether the friction torque meets the design value. Under the combined action of the shear pin and the friction bushing, use a hydraulic jack to support the connecting plate until the shear pin is sheared. Record the pressure value of the hydraulic jack and obtain the difference between the actual shearing torque value and the theoretical torque value through calculation and comparison to determine whether the shearing torque of the shear pin meets the design value. Description of the drawings:

[0009] Figure 1 The figure is a top view of a friction torque test device for a hydraulic turbine movable guide vane connecting plate.

[0010] Markings in the figure: 1-base support plate, 2-test platform, 3-top block, 4-movable guide vane arm, 5-hydraulic jack, 6-pressure sensor, 7-support plate, 8-friction bushing, 9-tool shaft, 10-clamping bolt, 11-clamping nut, 12-connecting hole, 13-shear pin, 14-locating hole, 15-base plate, 16-oil pipe, 17-data acquisition line. Specific implementation method:

[0011] like Figure 1As shown, a friction torque test device for a hydraulic turbine movable guide vane connecting plate comprises a basic support plate 1, a test platform 2, a top block 3, a movable guide vane arm 4, a hydraulic jack 5, a pressure sensor 6, a support plate 7, a friction bushing 8, a tool shaft 9, a clamping bolt 10, a clamping nut 11, a connecting hole 12, a shear pin 13, a positioning hole 14, a bottom plate 15, an oil pipe 16 and a data acquisition line 17. The basic support plate 1 is fixed to the test platform 2 with bolts, one side of the top block 3 is pressed against the basic support plate 1, the other side of the top block 3 is pressed against one side of the movable guide vane arm 4, the other side of the movable guide vane arm 4 is pressed against the hydraulic jack 5, the back of the hydraulic jack 5 is pressed against the pressure sensor 6, and the pressure sensor 6 is pressed against the hydraulic jack 5. The back is pressed by a support plate 7, the movable guide vane arm 4 is heat-shrink-fitted on the tool shaft 9, four positioning holes 14 are evenly distributed around the upper part of the tool shaft 9, the friction bushing 8 is clamped and installed above the movable guide vane arm 4, a clamping bolt 10 is installed at one end of the friction bushing 8 and clamped with a clamping nut 11, a connecting hole 12 is machined at the other end of the friction bushing 8, the movable guide vane arm 4 is connected to the friction bushing 8 with a shear pin 13, the hydraulic jack 5 and the pressure sensor 6 are installed above the base plate 15, the hydraulic jack 5 is connected to the pressure pump with an oil pipe 16, and the pressure sensor 6 is connected to the pressure acquisition instrument with a data acquisition line 17. After the overall assembly is completed, a friction torque test device for the movable guide vane connecting plate of a turbine is formed.

[0012] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the scope and spirit of the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications.

Claims

1. A friction torque test device for a hydraulic turbine guide vane connecting plate, characterized in that: The apparatus comprises a basic support plate (1), a test platform (2), a top block (3), a movable guide vane arm (4), a hydraulic jack (5), a pressure sensor (6), a support plate (7), a friction bushing (8), a tool shaft (9), a clamping bolt (10), a clamping nut (11), a connecting hole (12), a shear pin (13), a positioning hole (14), a bottom plate (15), an oil pipe (16) and a data acquisition line (17). The basic support plate (1) is fixed to the test platform (2) by bolts, one side of the top block (3) is pressed against the basic support plate (1), the other side of the top block (3) is pressed against one side of the movable guide vane arm (4), the other side of the movable guide vane arm (4) is pressed against by a hydraulic jack (5), and the back of the hydraulic jack (5) is pressed against the pressure sensor (6). The back of the pressure sensor (6) is pressed by a support plate (7), the movable guide vane arm (4) is installed on the tool shaft (9) by shrink sleeve, the friction bushing (8) is clamped and installed above the movable guide vane arm (4), one end of the friction bushing (8) is installed with a clamping bolt (10) and clamped with a clamping nut (11), the other end of the friction bushing (8) is machined with a connecting hole (12), the movable guide vane arm (4) and the friction bushing (8) are connected by a shear pin (13), the hydraulic jack (5) and the pressure sensor (6) are installed above the bottom plate (15), the hydraulic jack (5) is connected to the pressure pump by an oil pipe (16), and the pressure sensor (6) is connected to the pressure acquisition instrument by a data acquisition line (17). After the overall assembly is completed, a friction torque test device for the movable guide vane connecting plate of a hydraulic turbine is formed.

2. A turbine movable guide vane connecting plate friction torque test device according to claim 1, characterized in that: The upper part of the tool shaft (9) is machined with four positioning holes (14) evenly distributed around the circumference.

Images