A sealing clamp for steam turbine valve stem air leakage plugging

Abstract

The utility model belongs to steam turbine technical field especially a kind of sealing fixture for steam turbine valve stem air leakage plugging, in view of the existing steam turbine valve stem plugging mode usually adopts sealing glue, increases sealing washer etc., it is easy to fail under high temperature working condition, it is difficult to meet the long-term stable operation demand of steam turbine problem, present and propose following scheme, it includes valve cover, nut and valve stem, column type groove is opened in valve cover, nut is installed on valve cover, and valve stem is installed in nut;Clamping mechanism, clamping mechanism is arranged in column type groove, and clamping mechanism is used to clamp sealing nut;First half round clamping seat, first half round clamping seat is provided with two, two first half round clamping seat are slidably installed in column type groove, the utility model can be in use process, it is convenient to carry out sufficient clamping sealing to packing nut, effectively solve the problem of regulating valve stem seal leakage, simple structure, convenient to use.

Description

Technical Field

[0001] This application relates to the field of steam turbine technology, and in particular to a sealing clamp for sealing steam turbine valve stem leakage. Background Technology

[0002] In steam turbine operation, the regulating valve, as a key component controlling steam flow and pressure, directly affects the unit's operating efficiency and safety through its stem sealing performance. Currently, the industry commonly uses packing seals, which involve filling the stuffing box with original factory-matched sealing packing and securing it with an upper threaded sleeve. However, this structure has significant drawbacks in practical applications: after the turbine unit undergoes maintenance and the original factory packing is replaced, slight leakage appears on the regulating valve stem after about 6 months of operation. While tightening the threaded sleeve can temporarily alleviate the problem, it cannot completely restore the sealing effect. After 12 months of operation, the leakage worsens dramatically, and tightening the threaded sleeve again completely fails, resulting in a near-complete loss of the sealing function. Calculations show that this type of leakage leads to an annual steam loss of up to 7,300 tons, causing not only serious energy waste and economic losses but also requiring frequent shutdowns for maintenance, affecting the unit's continuous and stable operation. Furthermore, the leaked high-temperature steam poses a potential threat to the surrounding environment and the safety of operators.

[0003] In existing technologies, turbine valve stem sealing methods typically employ sealant or additional gaskets, which are prone to failure under high-temperature conditions and cannot meet the long-term stable operation requirements of turbines. Therefore, we propose a sealing fixture for sealing turbine valve stem leaks to address the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies that typically use sealant or gaskets to seal turbine valve stems, which are prone to failure under high-temperature conditions and cannot meet the long-term stable operation requirements of turbines. Therefore, this invention proposes a sealing clamp for sealing turbine valve stem leaks.

[0005] The sealing clamp for sealing leaks in steam turbine valve stems provided in this application adopts the following technical solution:

[0006] A sealing clamp for sealing leaks in steam turbine valve stems, comprising:

[0007] The valve cover, nut, and valve stem are provided. A cylindrical groove is provided inside the valve cover. The nut is installed on the valve cover, and the valve stem is installed inside the nut.

[0008] The clamping mechanism is set in the column groove and is used to clamp and seal the nut.

[0009] There are two first semicircular clamps, and both first semicircular clamps are slidably installed in the cylindrical groove.

[0010] Furthermore, a second sealing gasket is fixedly connected to the inner wall of each of the two first semicircular clamps, a through groove is provided on each of the two first semicircular clamps, and a connecting column is fixedly installed on the outer side of each of the two first semicircular clamps.

[0011] Furthermore, a second through hole is provided on one side of the inner wall of each of the two through slots, and a rectangular rod is rotatably installed in each of the two second through holes. A rectangular groove is provided at the other end of each of the two screws, and the two rectangular rods are slidably installed in the two rectangular grooves respectively. When the two screws rotate, the screws drive the rectangular rods to rotate through the rectangular grooves.

[0012] Furthermore, a driving bevel gear is fixedly installed at one end of each of the two rectangular rods, and a driven bevel gear is fixedly installed on the outer side of each of the two bidirectional lead screws. The driving bevel gear meshes with the driven bevel gear, and when the rectangular rods rotate, the driving bevel gear drives the driven bevel gear to rotate.

[0013] Furthermore, the top and bottom inner walls of the two through slots are provided with third through holes, and two bidirectional lead screws are rotatably installed in the four third through holes. The two bidirectional lead screws are threadedly connected to the four second semicircular clamps respectively. When the bidirectional lead screws rotate, they drive the two second semicircular clamps to move vertically towards each other.

[0014] Furthermore, the clamping mechanism includes two screws, and two first through holes are opened on the inner wall of the cylindrical groove. The two screws are rotatably installed in the two first through holes respectively. The two screws are threadedly connected to the two connecting columns respectively. A handwheel is fixedly installed at one end of each screw. When the handwheel is rotated, the screw drives the connecting column to move horizontally.

[0015] Furthermore, the top and bottom of the two first semicircular clamps are provided with sliding grooves, and the second semicircular clamps are slidably installed in the four sliding grooves. The first sealing gaskets are fixedly connected to the four second semicircular clamps.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. This solution involves rotating two handwheels, which in turn drive two screws to rotate. The two screws then drive two connecting posts to move closer together, which in turn drive two first semicircular clamps to move closer together. As a result, the two first semicircular clamps and the two second sealing gaskets can clamp and seal the nut.

[0018] 2. In this solution, two screws drive two rectangular rods to rotate through two rectangular slots. The two rectangular rods drive two active bevel gears to rotate, which in turn drive two driven bevel gears to rotate. The driven bevel gears then drive two bidirectional lead screws to rotate. The bidirectional lead screws cause the two second semicircular clamps to move away from each other, thereby causing the two first sealing gaskets to press against the top and bottom inner walls of the cylindrical groove, further improving the sealing effect.

[0019] This invention facilitates the full clamping and sealing of the packing nut during use, effectively solving the problem of leakage in the regulating valve stem seal. It has a simple structure and is easy to use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main view of a sealing clamp for sealing leakage of a steam turbine valve stem, as proposed in this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of a sealing clamp inside the valve cover for sealing leakage of steam turbine valve stem, as proposed in this utility model.

[0022] Figure 3 This is a schematic diagram of the clamping mechanism of a sealing clamp for sealing leakage of a steam turbine valve stem, as proposed in this utility model.

[0023] Figure 4 This utility model proposes a sealing clamp for sealing leaks in steam turbine valve stems. Figure 3 An enlarged structural diagram of part A in the middle.

[0024] Reference numerals: 1. Valve cover; 2. Nut; 3. Valve stem; 4. Columnar groove; 5. First semi-circular clamp; 6. Through groove; 7. Slide groove; 8. Second semi-circular clamp; 9. First sealing gasket; 10. Connecting column; 11. Screw; 12. Handwheel; 13. Rectangular rod; 14. Driving bevel gear; 15. Driven bevel gear; 16. Double-acting screw; 17. Second sealing gasket; 18. Rectangular groove. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example 1

[0026] Reference Figures 1-4 A sealing clamp for sealing leakage of steam turbine valve stem includes: valve cover 1, nut 2 and valve stem 3, the valve cover 1 has a cylindrical groove 4, the nut 2 is installed on the valve cover 1, and the valve stem 3 is installed in the nut 2;

[0027] The clamping mechanism is set in the column groove 4 and is used to clamp and seal the nut 2;

[0028] There are two first semicircular clamps 5, and both first semicircular clamps 5 are slidably installed in the cylindrical groove 4.

[0029] In this embodiment, the inner walls of the two first semicircular clamps 5 are fixedly connected with second sealing gaskets 17, and the two first semicircular clamps 5 are provided with through grooves 6. The outer sides of the two first semicircular clamps 5 are fixedly installed with connecting columns 10. The clamping mechanism includes two screws 11. The inner wall of the columnar groove 4 is provided with two first through holes. The two screws 11 are respectively rotatably installed in the two first through holes. The two screws 11 are respectively threadedly connected to the two connecting columns 10. A handwheel 12 is fixedly installed at one end of the two screws 11. When the handwheel 12 is rotated, the screws 11 drive the connecting columns 10 to move horizontally. The top and bottom of the two first semicircular clamps 5 are provided with sliding grooves 7. The four sliding grooves 7 are each slidably installed with second semicircular clamps 8. The four second semicircular clamps 8 are each fixedly connected with first sealing gaskets 9. The first sealing gaskets 9 and the second sealing gaskets 17 are both made of polytetrafluoroethylene (PTFE) material.

[0030] In this embodiment, a second through hole is provided on one side of the inner wall of each of the two through slots 6. A rectangular rod 13 is rotatably installed in each of the two second through holes. A rectangular groove 18 is provided at the other end of each of the two screws 11. The two rectangular rods 13 are slidably installed in the two rectangular grooves 18 respectively. When the two screws 11 rotate, the screws 11 drive the rectangular rods 13 to rotate through the rectangular grooves 18. A driving bevel gear 14 is fixedly installed at one end of each of the two rectangular rods 13. A driven bevel gear 15 is fixedly installed on the outer side of each of the two bidirectional lead screws 16. The driving bevel gear 14 meshes with the driven bevel gear 15. When the rectangular rods 13 rotate, the driving bevel gear 14 drives the driven bevel gear 15 to rotate. A third through hole is provided on the top inner wall and the bottom inner wall of each of the two through slots 6. Two bidirectional lead screws 16 are rotatably installed in the four third through holes. The two bidirectional lead screws 16 are threadedly connected to the four second semicircular clamps 8 respectively. When the bidirectional lead screws 16 rotate, the bidirectional lead screws 16 drive the two second semicircular clamps 8 to move vertically towards each other.

[0031] The implementation principle of a sealing clamp for sealing leakage of steam turbine valve stem according to an embodiment of this application is as follows: In use, by rotating two handwheels 12, the two handwheels 12 respectively drive the two screws 11 to rotate, the two screws 11 respectively drive the two connecting columns 10 to move closer to each other, and the two connecting columns 10 respectively drive the two first semi-circular clamps 5 to move closer to each other. Then, the two first semi-circular clamps 5 and the two second sealing gaskets 17 can clamp and seal the nut 2. At the same time, the two screws 11 respectively drive the two rectangular rods 13 to rotate through the two rectangular grooves 18. The two rectangular rods 13 respectively drive the two driving bevel gears 14 to rotate, the two driving bevel gears 14 respectively drive the two driven bevel gears 15 to rotate, and the two driven bevel gears 15 respectively drive the two double-acting screws 16 to rotate. The double-acting screws 16 drive the two second semi-circular clamps 8 to move away from each other, and then the two first sealing gaskets 9 are pressed and contacted with the top inner wall and bottom inner wall of the cylindrical groove 4, further improving the sealing effect. Example 2

[0032] The difference between this embodiment and embodiment one is that pressure sensors are fixedly installed on the inner walls of both first semicircular clamps 5, and a controller and a warning light are fixedly installed on the top of the valve cover 1. The pressure sensors, controller and warning light are connected in sequence. The pressure sensors can monitor the clamping force of the first semicircular clamps 5 on the nut 2 in real time. When the clamping force is reduced to a preset threshold, the pressure sensor sends a command to the controller, and the controller controls the warning light to light up, reminding the staff to maintain and handle it in time.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealing clamp for sealing leaks in a steam turbine valve stem, comprising a valve cover (1), a nut (2), and a valve stem (3), characterized in that: A columnar groove (4) is provided inside the valve cover (1), a nut (2) is installed on the valve cover (1), and a valve stem (3) is installed inside the nut (2); The clamping mechanism is set in the column groove (4) and is used to clamp and seal the nut (2); There are two first semicircular clamps (5), and both first semicircular clamps (5) are slidably installed in the columnar groove (4).

2. A sealing clamp for sealing leaks in a steam turbine valve stem according to claim 1, characterized in that: The top and bottom of the two first semicircular clamps (5) are provided with sliding grooves (7), and the four sliding grooves (7) are each slidably installed with second semicircular clamps (8). The four second semicircular clamps (8) are each fixedly connected with first sealing gaskets (9).

3. A sealing clamp for sealing leakage in a steam turbine valve stem according to claim 2, characterized in that: The inner walls of the two first semicircular clamps (5) are fixedly connected with second sealing gaskets (17), and the two first semicircular clamps (5) are provided with through grooves (6). The outer sides of the two first semicircular clamps (5) are fixedly installed with connecting columns (10).

4. A sealing clamp for sealing leakage in a steam turbine valve stem according to claim 3, characterized in that: The clamping mechanism includes two screws (11), and two first through holes are opened on the inner wall of the column groove (4). The two screws (11) are rotatably installed in the two first through holes respectively. The two screws (11) are threadedly connected to the two connecting columns (10) respectively. A handwheel (12) is fixedly installed at one end of each screw (11).

5. A sealing clamp for sealing leakage in a steam turbine valve stem according to claim 4, characterized in that: A second through hole is provided on one side of the inner wall of each of the two through slots (6), and a rectangular rod (13) is rotatably installed in each of the two second through holes. A rectangular slot (18) is provided at the other end of each of the two screws (11), and the two rectangular rods (13) are slidably installed in the two rectangular slots (18).

6. A sealing clamp for sealing leakage in a steam turbine valve stem according to claim 5, characterized in that: The top and bottom inner walls of the two through slots (6) are provided with third through holes. Two bidirectional screws (16) are rotatably installed in the four third through holes. The two bidirectional screws (16) are threadedly connected to the four second semicircular clamps (8) respectively.

7. A sealing clamp for sealing leakage in a steam turbine valve stem according to claim 6, characterized in that: One end of each of the two rectangular rods (13) is fixedly equipped with a driving bevel gear (14), and the outer side of each of the two bidirectional lead screws (16) is fixedly equipped with a driven bevel gear (15). The driving bevel gear (14) meshes with the driven bevel gear (15).

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