A steam turbine emergency trip device adjustment tool

Abstract

An adjustment tool for a steam turbine emergency trip device. During a steam turbine mechanical overspeed test, when the operating speed of the emergency trip device does not meet requirements, it is necessary to adjust the spring preload of the emergency trip device to achieve the operating speed of the flyweight impactor. Each adjustment requires removing the front bearing housing cover and adjusting the rotation direction and angle of the adjusting nut to change the spring preload, which is laborious and inconvenient. This invention includes: an outer tube and an inner fixing rod. The inner fixing rod is located inside the outer tube and connected to the outer tube via a bearing. The upper end of the inner fixing rod is connected to a drive rod via a bearing. A drive bevel gear is fixed on the drive rod, and a fixed bevel gear is fixed on the outer tube, meshing with the drive bevel gear. The bottom of the outer tube has an insert, and the bottom of the inner fixing rod has a locking piece. This invention is used for adjusting a steam turbine emergency trip device.

Description

Technical Field

[0001] This utility model relates to an adjustment tool for an emergency shutdown device of a steam turbine. Background Technology

[0002] The flying hammer type emergency trip device is installed in the longitudinal hole at the front end of the turbine main shaft. It consists of a flying hammer, a housing, a spring, and an adjusting nut. When the operating speed of the emergency trip device does not meet the requirements during the turbine mechanical overspeed test, it is necessary to adjust the spring preload of the emergency trip device to achieve the operating speed of the flying hammer impactor. Each adjustment requires removing the front bearing housing cover and adjusting the rotation direction and angle of the adjusting nut to change the spring preload, which is laborious and inconvenient. Utility Model Content

[0003] The purpose of this utility model is to provide a turbine emergency shutdown device adjustment tool to solve the technical problems existing in the background art.

[0004] This utility model provides the following technical solution:

[0005] An adjustment tool for an emergency trip device of a steam turbine comprises an outer tube and an inner fixing rod. The inner fixing rod is located inside the outer tube and is connected to the outer tube via a bearing. The upper end of the inner fixing rod is connected to a drive rod via a bearing. A drive bevel gear is fixed on the drive rod, and a fixed bevel gear is fixed on the outer tube. The fixed bevel gear meshes with the drive bevel gear.

[0006] The bottom of the outer tube has an insert plate, and the bottom of the inner fixing rod has a locking plate.

[0007] The aforementioned turbine emergency trip device adjustment tool includes an inner fixing rod comprising a straight rod section, a locking piece fixed to the bottom of the straight rod section, an expansion rod fixed to the top of the straight rod section, and the top of the expansion rod being fixed to a hand grip.

[0008] The aforementioned turbine emergency trip device adjustment tool has a scale arranged in a circle on the expansion rod and a marking groove on the outer wall of the outer tube. Beneficial effects

[0009] 1. This utility model allows the locking plate of the inner fixing rod to be inserted into the locking groove of the valve core. One hand holds the handle head, and the other hand rotates the drive rod. The drive bevel gear of the drive rod meshes with the fixed bevel gear of the outer tube, causing it to drive the outer tube to rotate. The insert of the outer tube is inserted into the slot of the adjusting nut. The adjustment nut can be rotated by rotating the outer tube to achieve adjustment. At the same time, the scale on the expansion rod can be observed during the rotation of the outer tube, so that the rotation angle can be accurately determined. Attached Figure Description

[0010] Figure 1 This is a perspective view of the present utility model;

[0011] Figure 2 This is the front view of the present invention;

[0012] Figure 3 This is a side view of the present invention;

[0013] Figure 4 This is a top view of the present invention;

[0014] Figure 5 for Figure 1 Enlarged view of part A;

[0015] Figure 6 for Figure 1 Enlarged view of part B;

[0016] Figure 7 for Figure 2 A cross-sectional view of the CC section;

[0017] Figure 8 for Figure 3 Enlarged view of part D;

[0018] Figure 9 This is a schematic diagram of an emergency circuit breaker.

[0019] In the diagram: 1. Outer tube; 2. Fixed bevel gear; 3. Inner retaining rod; 4. Drive rod; 5. Drive bevel gear; 6. Expanding rod; 7. Hand grip; 8. Insert plate; 9. Locking plate; 10. Straight rod section; 11. Circular groove; 12. Marking groove; 13. Scale; 14. Locking groove; 15. Valve core; 16. Adjusting nut; 17. Slot. Detailed Implementation

[0020] Reference Figures 1-8 An adjustment tool for an emergency trip device of a steam turbine, comprising an outer tube 1 and an inner fixing rod 3, wherein the inner fixing rod is located inside the outer tube and connected to the outer tube via a bearing, the upper end of the inner fixing rod is connected to a drive rod 4 via a bearing, a drive bevel gear 5 is fixed on the drive rod, and a fixed bevel gear 2 is fixed on the outer tube, wherein the fixed bevel gear meshes with the drive bevel gear.

[0021] The bottom of the outer tube has a insert plate 8, and the bottom of the inner fixing rod has a locking plate 9.

[0022] The inner fixing rod includes a straight rod section 10, a locking piece 9 is fixed at the bottom of the straight rod section, an extension rod 6 is fixed at the top of the straight rod section, and the top of the extension rod is fixed to the hand grip head 7;

[0023] A circular groove 11 is provided on the expansion rod, and the groove is connected to the drive rod through a bearing. A drive bevel gear is fixed on the drive rod.

[0024] The bottom of the outer tube has two inserts, which are distributed opposite each other on the outer tube. The bottom of the straight section of the inner fixing rod has a locking piece.

[0025] The expansion rod is engraved with a scale 13 arranged in a circle, and the outer wall of the outer tube is engraved with a marking groove 12.

[0026] Working principle: When using it, refer to... Figure 9 Insert the locking plate of the inner rod into the locking groove of the valve core, and simultaneously insert the outer tube's insert into the slot of the adjusting nut. Then, hold the handle with one hand and rotate the drive rod with the other. Holding the handle with your hand keeps the valve core in place. The drive bevel gear of the drive rod meshes with the fixed bevel gear of the outer tube, causing it to rotate. The insert of the outer tube is inserted into the slot of the adjusting nut. The adjustment can be achieved by rotating the outer tube to drive the adjusting nut. The outer tube has a graduated groove. During the rotation of the outer tube, you can observe the change in the graduated groove's alignment with the scale on the expansion rod, allowing you to accurately determine the angle of rotation.

[0027] The inner fixing rod is used to fix the valve core of the emergency trip device and prevent the valve core from rotating. The outer tube adjusts the adjusting nut of the emergency trip device. For every 45° rotation of the outer tube, the number of rotations of the emergency trip device increases or decreases by 30 revolutions. The angle of the adjusting nut of the emergency trip device is determined according to the required number of rotations of the emergency trip device to achieve the adjustment purpose.

Claims

1. A tool for adjusting an emergency trip device in a steam turbine, characterized in that: Its components include an outer tube and an inner fixing rod. The inner fixing rod is located inside the outer tube and is connected to the outer tube through a bearing. The upper end of the inner fixing rod is connected to a drive rod through a bearing. A drive bevel gear is fixed on the drive rod, and a fixed bevel gear is fixed on the outer tube. The fixed bevel gear meshes with the drive bevel gear. The bottom of the outer tube has an insert plate, and the bottom of the inner fixing rod has a locking plate.

2. A turbine trip adjuster tool as claimed in claim 1, characterised in that: The inner fixing rod includes a straight rod section, a locking piece is fixed to the bottom of the straight rod section, an extension rod is fixed to the top of the straight rod section, and the top of the extension rod is fixed to the hand grip head.

3. A turbine trip adjuster tool as claimed in claim 2, characterised in that: The expansion rod is engraved with a scale arranged in a circle, and the outer wall of the outer tube is engraved with a marking groove.

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