Hydraulic main steam valve rotation positioning device under on-load working condition of steam turbine

Abstract

A hydraulic main steam valve rotating and positioning device under the on-load working condition of a steam turbine comprises a fixing ring, the fixing ring can be connected to the periphery of a valve rod in a sleeving mode, a fixing arc-shaped piece is arranged on the periphery of the fixing ring, one end of the fixing arc-shaped piece is fixedly connected with one end of a metal induction piece, a first screw hole is formed in the fixing ring, and a second screw hole is formed in the fixing ring. A first screw hole is formed in the fixing ring, a second screw hole is formed in the position, corresponding to the first screw hole, of the fixing arc-shaped piece, the first screw hole and the second screw hole can be in threaded connection with a fixing screw, the fixing ring and the arc-shaped piece can be fixedly connected with the valve rod through the fixing screw, and a metal sensor is arranged at the designated position of the metal induction piece in the horizontal direction. The hydraulic main steam valve device can be conveniently rotated by a specified angle when the hydraulic main steam valve device is rotated, so that the safe use of the hydraulic main steam valve device is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of steam turbine operation, specifically a hydraulic main steam valve rotation positioning device under steam turbine load conditions. Background Technology

[0002] In thermal power plants, when steam turbines operate under load for extended periods, the hydraulic main steam valve is always fully open. To prevent jamming when the generator set's operating conditions suddenly change and the low-pressure main steam valve needs to be shut down urgently, which could cause significant safety hazards, it is necessary to periodically rotate the hydraulic main steam valve to avoid jamming during emergency shutdowns. However, the rotation adjustment of the hydraulic main steam valve requires rotating it to a specific angle, and currently, there is a lack of a rotation positioning device. Utility Model Content

[0003] This invention provides a hydraulic main steam valve rotation positioning device for steam turbines under load conditions, in order to solve the defects in the prior art.

[0004] This utility model is achieved through the following technical solution:

[0005] A hydraulic main steam valve rotation positioning device for a steam turbine under load includes a fixed ring that can be sleeved on the outer circumference of a valve stem. A fixed arc-shaped piece is provided on the outer circumference of the fixed ring, one end of which is fixedly connected to one end of a metal sensing piece. A first screw hole is provided on the fixed ring, and a second screw hole is provided at the corresponding position of the fixed arc-shaped piece and the first screw hole. The first and second screw holes can be threadedly connected to a fixed screw rod. The fixed screw rod can fix the fixed ring and the arc-shaped piece to the valve stem. A metal sensor is provided at a designated position in the horizontal direction of the metal sensing piece.

[0006] As described above, the hydraulic main steam valve rotation positioning device for a steam turbine under load conditions has three first screw holes, three second screw holes, and three fixing screws.

[0007] As described above, a hydraulic main steam valve rotation positioning device for a steam turbine under load conditions is provided with a rubber washer and a metal washer between the fixing screw and the second screw hole.

[0008] As described above, a hydraulic main steam valve rotation positioning device for a steam turbine under load conditions is provided with a fixing lug at each end of the bottom of the metal sensor, and a fixing plate is provided at the bottom of the metal sensor. The fixing lug and the fixing plate are fixedly connected by bolts.

[0009] As described above, in a hydraulic main steam valve rotation positioning device under load conditions of a steam turbine, the bottom four corners of the fixed plate are respectively fixedly connected to the top of a vertically arranged telescopic rod, and the bottom end of the telescopic rod is fixedly connected to the valve body.

[0010] The advantages of this utility model are: it can conveniently rotate the hydraulic main steam valve equipment at a specified angle, thereby ensuring the safe use of the hydraulic main steam valve equipment. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 yes Figure 1 An enlarged view of the A-direction view;

[0014] Figure 3 yes Figure 1 A magnified view of part I.

[0015] Reference numerals in the attached diagram: 1. Retaining ring; 2. Valve stem; 3. Retaining arc-shaped plate; 4. Metal sensing plate; 5. First screw hole; 6. Second screw hole; 7. Retaining screw; 8. Metal sensor; 9. Rubber washer; 10. Metal gasket; 11. Retaining lug; 12. Retaining plate; 13. Bolt; 14. Telescopic rod; 15. Valve body. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] like Figure 1-3As shown, a hydraulic main steam valve rotation positioning device under load conditions of a steam turbine includes a fixing ring 1, which can be sleeved on the outer circumference of a valve stem 2. A fixing arc-shaped piece 3 is provided on the outer circumference of the fixing ring 1. One end of the fixing arc-shaped piece 3 is fixedly connected to one end of a metal sensing piece 4. A first screw hole 5 is provided on the fixing ring 1. A second screw hole 6 is provided at the corresponding position of the fixing arc-shaped piece 3 and the first screw hole 5. The first screw hole 5 and the second screw hole 6 can be threadedly connected to a fixing screw 7. The fixing screw 7 can fix the fixing ring 1 and the arc-shaped piece 3 to the valve stem 2. A metal sensor 8 is provided at a designated position in the horizontal direction of the metal sensing piece 4. This invention features a valve stem 2 that rotates along with the hydraulic main steam valve, thereby driving the fixed ring, fixed arc-shaped plate 3, and metal sensing plate 4 to rotate. When the metal sensor 8 detects the metal sensing plate 4 during the rotation of the hydraulic main steam valve, it rotates to a specified angle and stops rotating. The operation is simple and convenient. Furthermore, the current hydraulic main steam valve is an electric valve. When the hydraulic main steam valve is fully open, pressing the "test" button will cause the hydraulic main steam valve to automatically open and close N times within the range of the fully open position and the angle of the positioning device, i.e., the rotation angle of the metal sensing plate 4 detected by the metal sensor 8 (adjustable according to requirements within 45-80% of the hydraulic main steam valve opening), where N can be set according to actual needs. After the hydraulic main steam valve completes its rotation, it returns to the fully open working state.

[0018] Specifically, in this embodiment, the number of the first screw hole 5, the second screw hole 6, and the fixing screw 7 are all three.

[0019] Specifically, in this embodiment, a rubber washer 9 and a metal washer 10 are provided between the fixing screw 7 and the second screw hole 6.

[0020] Furthermore, in this embodiment, a fixing ear 11 is provided at each of the two ends of the bottom of the metal sensor 8, and a fixing plate 12 is provided at the bottom of the metal sensor 8. The fixing ear 11 and the fixing plate 12 are fixedly connected by bolts 13.

[0021] Furthermore, in this embodiment, the four bottom corners of the fixing plate 12 are respectively fixedly connected to the top end of a vertically arranged telescopic rod 14, and the bottom end of the telescopic rod 14 is fixedly connected to the valve body 15. This utility model allows for convenient adjustment of the installation height of the metal sensor 8 via the telescopic rod 14, thereby ensuring the accuracy of the interaction between the metal sensor 8 and the metal sensing element 4.

[0022] Preferably, the fixing ring 1 described in this embodiment is made of stainless steel 316, which has better corrosion resistance and high temperature strength, and better high temperature resistance and corrosion resistance when in contact with special working environments; the inner diameter * outer diameter * thickness of the fixing ring 1 is 28mm * 40mm * 12mm, the valve stem 2 has a diameter of 25mm, a first screw hole 5 with a diameter of 6mm is machined at the center point of the plane, and a first screw hole 5 with a diameter of 6mm is machined on the left and right sides of the center point of the plane.

[0023] Preferably, the metal sensing sheet 4 described in this embodiment is an arc-shaped sheet or a C-shaped structure, with the protruding part of the metal sensing sheet 4 facing the metal sensor 8.

[0024] Preferably, the metal sensor 8 described in this embodiment is a BAK TL-W3MC1 with a working voltage of 24V. It has good working voltage adaptability, stable operation, fast measurement response speed, and high measurement accuracy. It can be widely used to measure the end point or middle position of the linear or angular stroke of hydraulic actuators, pneumatic actuators, and electric actuators. It has a wide range of applications and can also be used in confined spaces.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydraulic main steam valve rotation positioning device for steam turbines under load conditions, characterized in that: The device includes a fixing ring (1) that can be fitted onto the outer circumference of the valve stem (2). A fixing arc-shaped piece (3) is provided on the outer circumference of the fixing ring (1). One end of the fixing arc-shaped piece (3) is fixedly connected to one end of the metal sensing piece (4). A first screw hole (5) is provided on the fixing ring (1). A second screw hole (6) is opened at the corresponding position of the fixing arc-shaped piece (3) and the first screw hole (5). The first screw hole (5) and the second screw hole (6) can be threadedly connected to a fixing screw (7). The fixing screw (7) can fix the fixing ring (1) and the arc-shaped piece (3) to the valve stem (2). A metal sensor (8) is provided at a designated position in the horizontal direction of the metal sensing piece (4).

2. The hydraulic main steam valve rotation positioning device under load conditions of a steam turbine according to claim 1, characterized in that: The number of the first screw hole (5), the second screw hole (6), and the fixing screw (7) are all three.

3. The hydraulic main steam valve rotation positioning device under load conditions of a steam turbine according to claim 1, characterized in that: A rubber washer (9) and a metal washer (10) are provided between the fixing screw (7) and the second screw hole (6).

4. The hydraulic main steam valve rotation positioning device under load conditions of a steam turbine according to claim 1, characterized in that: The metal sensor (8) has a fixing ear (11) at each end of its bottom sides, and a fixing plate (12) is provided at the bottom of the metal sensor (8). The fixing ear (11) and the fixing plate (12) are fixedly connected by bolts (13).

5. The hydraulic main steam valve rotation positioning device under load conditions of a steam turbine according to claim 4, characterized in that: The bottom four corners of the fixed plate (12) are respectively fixedly connected to the top of a vertically arranged telescopic rod (14), and the bottom end of the telescopic rod (14) is fixedly connected to the valve body (15).

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