A vibration protection control device for a power plant steam turbine

Abstract

The utility model relates to turbine technical field and disclose a power plant turbine vibration protection control device, the outside movable installation of turbine rotor shaft has vibration detection subassembly, the front and back both sides of ring shell all are fixedly installed with face shell, fixedly installed with the partition that arranges in ring between two face shell, the sliding installation of adjacent two partition has arc plate. Turbine rotor shaft will eccentric rotation when rotating, will vibrate at this time, turbine rotor shaft will form extrusion to arc plate simultaneously, and arc plate will contract inwards along the axis of slide rod, and the gasket on arc plate will form extrusion to the trigger end of pressure sensor, and pressure sensor will detect pressure value, and will pass pressure signal to PLC controller, if pressure value exceeds the preset value, PLC controller will control turbine body to stop running, thereby realizes the vibration detection in the operation of turbine and controls its stop running and protects.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a vibration protection and control device for a steam turbine in a power plant. Background Technology

[0002] Most vibrations in steam turbine generator sets during operation are caused by the rotation of the rotor shaft. (Refer to...) Figure 6 Once the rotor shaft deviates from its angle, it will cause the entire steam turbine generator set to vibrate. The magnitude of the vibration depends on the size of the rotor shaft's deviation angle. The vibration caused by the rotor shaft rotation will generate great stress on rotating components such as blades and impellers, leading to fatigue damage. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a vibration protection and control device for power plant steam turbines, which has the advantages of vibration detection and protection, and solves the problems mentioned above.

[0005] (II) Technical Solution

[0006] To achieve the aforementioned vibration detection and protection objectives, this utility model provides the following technical solution: a vibration protection and control device for a power plant steam turbine, comprising a steam turbine body, a steam turbine rotor shaft fixedly installed at the center of the steam turbine body, a vibration detection component movably installed on the outer side of the steam turbine rotor shaft, the vibration detection component comprising an annular shell, face shells fixedly installed on both the front and rear sides of the annular shell, a bracket fixedly installed on the surface of the face shell, the bracket being fixedly installed to an external mounting base, a ring-shaped arrangement of partition plates fixedly installed between two face shells, an arc plate slidably installed between two adjacent partition plates, and a roller rotatably installed on the inner arc surface of the arc plate.

[0007] Preferably, a pad is fixedly installed on the side of the outer arc surface of the arc plate, a threaded sleeve is embedded on the surface of the ring shell, and a pressure sensor is connected to the internal thread of the threaded sleeve. The trigger end of the pressure sensor corresponds to the pad.

[0008] Preferably, a sliding sleeve is embedded on the surface of the annular shell, and a sliding rod is slidably installed inside the sliding sleeve. The other end of the sliding rod is movably connected to the outer arc surface of the arc plate, and the arc plate slides between the two partition plates through the sliding sleeve and the sliding rod.

[0009] Preferably, retaining rings are fixedly installed on the inner surface of the ring shell and the outer arc surface of the arc plate, and a spring is fitted between the upper and lower retaining rings, with the spring fitted on the outside of the slide rod.

[0010] Preferably, the pressure sensor is connected to an external PLC controller, and the PLC controller is connected to the controller of the turbine body.

[0011] (III) Beneficial Effects

[0012] Compared with the prior art, this utility model provides a vibration protection and control device for steam turbines in power plants, which has the following advantages:

[0013] 1. In normal mode, the turbine vibration protection and control device of this power plant operates with the turbine rotor shaft at a zero-degree angle to its own axis. This means the turbine rotor shaft rotates along its own axis without vibration. However, when the angle changes, the rotor shaft rotates eccentrically, causing vibration. Simultaneously, the turbine rotor shaft exerts pressure on the arc plate, causing it to contract inwards along the axis of the sliding rod. The pads on the arc plate then exert pressure on the trigger end of the pressure sensor. The pressure sensor detects the pressure value and transmits the signal to the PLC controller. If the pressure value exceeds a preset value, the PLC controller stops the turbine, thus protecting it from vibration during operation.

[0014] 2. The turbine vibration protection and control device of this power plant has multiple arc plates that contact the outer surface of the turbine rotor shaft through rollers when the turbine rotor shaft does not deviate angularly. When the turbine rotor shaft rotates, the rollers will also rotate, thereby reducing wear during rotation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the turbine rotor shaft and vibration detection assembly of this utility model;

[0016] Figure 2 This is a schematic diagram of the vibration detection component of this utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of the vibration detection component of this utility model;

[0018] Figure 4 This is a partial structural schematic diagram of the vibration detection component of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the arc plate, slide bar, and pressure sensor of this utility model;

[0020] Figure 6 This is a schematic diagram of existing technology.

[0021] In the diagram: 1. Steam turbine body; 2. Steam turbine rotor shaft; 3. Vibration detection assembly; 31. Ring shell; 32. Face shell; 33. Support; 34. Divider plate; 35. Arc plate; 36. Roller; 37. Pad block; 38. Threaded sleeve; 39. Pressure sensor; 310. Sliding sleeve; 311. Sliding rod; 312. Snap ring; 313. Spring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 A vibration protection and control device for a power plant steam turbine includes a steam turbine body 1, a steam turbine rotor shaft 2 fixedly installed at the center of the steam turbine body 1, and a vibration detection component 3 movably installed on the outer side of the steam turbine rotor shaft 2 for detecting vibrations caused by the offset of the steam turbine rotor shaft 2.

[0024] Please see Figure 2-3 The vibration detection component 3 includes an annular shell 31, with a face shell 32 fixedly installed on both the front and rear sides of the annular shell 31. A bracket 33 is fixedly installed on the surface of the face shell 32, and the bracket 33 is fixedly installed to an external mounting base to ensure that the annular shell 31 and the face shell 32 do not rotate with the turbine rotor shaft 2. A ring-shaped partition plate 34 is fixedly installed between the two face shells 32. There are eight partition plates 34, which are arranged in a ring with equal spacing.

[0025] Please see Figure 2-3 An arc plate 35 is slidably installed between two adjacent partition plates 34, and a roller 36 is rotatably installed on the inner arc surface of the arc plate 35. When the turbine rotor shaft 2 does not deviate angularly, the multiple arc plates 35 contact the outer surface of the turbine rotor shaft 2 through the roller 36. When the turbine rotor shaft 2 rotates, the roller 36 also rotates, thereby reducing wear during rotation.

[0026] Please see Figure 4-5A pad 37 is fixedly installed on the side of the outer arc surface of the arc plate 35. A threaded sleeve 38 is embedded on the surface of the ring shell 31. A pressure sensor 39 is connected to the internal thread of the threaded sleeve 38. The trigger end of the pressure sensor 39 corresponds to the pad 37. The pressure sensor 39 is connected to an external PLC controller, and the PLC controller is connected to the controller signal of the turbine body 1. When the arc plate 35 is squeezed inward, the pad 37 will compress the pressure sensor 39, and the pressure sensor 39 will transmit a signal to the PLC controller. The PLC controller will then determine whether to stop the entire turbine based on the pressure value.

[0027] Please see Figure 4-5 A sliding sleeve 310 is embedded on the surface of the annular shell 31. A sliding rod 311 is slidably installed inside the sliding sleeve 310. The other end of the sliding rod 311 is movably connected to the outer arc surface of the arc plate 35. The arc plate 35 slides between the two partition plates 34 through the sliding sleeve 310 and the sliding rod 311. When the arc plate 35 slides inward, it will slide along the axis of the sliding rod 311, ensuring that the arc plate 35 will always be in the center position displacement.

[0028] Please see Figure 4-5 Both the inner surface of the ring shell 31 and the outer arc surface of the arc plate 35 are fixedly installed with retaining rings 312. A spring 313 is fitted between the upper and lower retaining rings 312, and the spring 313 is fitted onto the outside of the slide rod 311. The two ends of the spring 313 are fixed to ensure that the spring 313 will not contact the slide rod 311. At the same time, the arc plate 35 slides inward, the spring 313 is compressed, and then the spring 313 will push the arc plate 35 to return to its original position.

[0029] Working principle: In normal mode, the angle between the turbine rotor shaft 2 and its own axis is zero degrees, that is, when the turbine rotor shaft 2 rotates, it will rotate along its own axis, and no vibration will occur at this time;

[0030] When the angle between the turbine rotor shaft 2 and its own axis changes, the turbine rotor shaft 2 will rotate eccentrically, which will cause vibration.

[0031] At the same time, the turbine rotor shaft 2 will compress the arc plate 35, and the arc plate 35 will contract inward along the axis of the slide rod 311. The pad 37 on the arc plate 35 will compress the trigger end of the pressure sensor 39. The pressure sensor 39 will detect the pressure value and transmit the pressure signal to the PLC controller. If the pressure value exceeds the preset value, the PLC controller will control the turbine body 1 to stop running, thereby realizing the protection of the turbine by detecting vibration during operation and controlling it to stop running.

[0032] When the turbine rotor shaft 2 does not deviate angularly, multiple arc plates 35 contact the outer surface of the turbine rotor shaft 2 through rollers 36. When the turbine rotor shaft 2 rotates, the rollers 36 also rotate, thereby reducing wear during rotation.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vibration protection and control device for a power plant turbine, comprising a turbine body (1), wherein a turbine rotor shaft (2) is fixedly mounted at the center of the turbine body (1), characterized in that: A vibration detection assembly (3) is movably installed on the outer side of the turbine rotor shaft (2). The vibration detection assembly (3) includes an annular shell (31). A face shell (32) is fixedly installed on both the front and rear sides of the annular shell (31). A bracket (33) is fixedly installed on the surface of the face shell (32). The bracket (33) is fixedly installed with an external mounting seat. A ring-shaped partition plate (34) is fixedly installed between the two face shells (32). An arc plate (35) is slidably installed between two adjacent partition plates (34). A roller (36) is rotatably installed on the inner arc surface of the arc plate (35).

2. The vibration protection and control device for a power plant steam turbine according to claim 1, characterized in that: A pad (37) is fixedly installed on the side of the outer arc surface of the arc plate (35). A threaded sleeve (38) is embedded on the surface of the ring shell (31). A pressure sensor (39) is connected to the internal thread of the threaded sleeve (38). The trigger end of the pressure sensor (39) corresponds to the pad (37).

3. The power plant turbine vibration protection and control device according to claim 2, characterized in that: The surface of the ring shell (31) is fitted with a sliding sleeve (310), and a sliding rod (311) is slidably installed inside the sliding sleeve (310). The other end of the sliding rod (311) is movably connected to the outer arc surface of the arc plate (35). The arc plate (35) slides between the two partition plates (34) through the sliding sleeve (310) and the sliding rod (311).

4. The vibration protection and control device for a power plant turbine according to claim 3, characterized in that: The inner surface of the ring shell (31) and the outer arc surface of the arc plate (35) are fixedly installed with retaining rings (312), and a spring (313) is fitted between the upper and lower retaining rings (312). The spring (313) is fitted on the outside of the slide rod (311).

5. The vibration protection and control device for a power plant steam turbine according to claim 2, characterized in that: The pressure sensor (39) is connected to an external PLC controller, and the PLC controller is connected to the controller of the turbine body (1).

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