A steam turbine quick closing valve

Abstract

The utility model discloses a steam turbine speed valve, including valve body, install the fixed shell that communicates with each other with its on the air inlet pipe of valve body top, the inside of fixed shell is provided with filter connection subassembly, be provided with sealed spacing subassembly on fixed shell, the top of fixed shell is installed with the air pipe of pipe's guide that communicates with each other, filter connection subassembly includes installation frame, installation frame setting in the inside of fixed shell, the inside of installation frame is provided with the filter screen of pluggable. The utility model discloses through the filter screen in fixed shell can effectively intercept the rust, welding slag, metal particle and so on solid impurity in steam, avoid the impurity to cause the valve clack to jam or sealing surface wear and tear in valve body, convenient to tear down the filter screen from fixed shell inside and maintain or replace simultaneously, filter screen and installation frame are independent assembly, can replace the filter screen of wear or blockage alone, reduced the cost of use, improved practicality.

Description

Technical Field

[0001] This utility model relates to the field of turbine quick-closing valve technology, specifically a turbine quick-closing valve. Background Technology

[0002] The quick-closing valve, also known as the main steam valve, is the primary shut-off mechanism between the main steam pipeline and the steam turbine. In an emergency, it can immediately cut off the steam supply to the turbine, enabling the unit to shut down quickly. Existing quick-closing valves mainly consist of a valve body, valve seat, butterfly valve, valve cover, hydraulic cylinder, piston assembly, and valve stem. The valve body, valve cover, and hydraulic cylinder are connected sequentially. The valve seat is installed inside the valve body, the piston assembly is installed inside the hydraulic cylinder, and the valve stem passes through the valve cover. One end of the valve stem is connected to the butterfly valve, and the other end is connected to the piston assembly. The hydraulic cylinder drives the valve stem to move left and right, thereby controlling the opening and closing of the quick-closing valve.

[0003] According to application number CN202122778078.4, a quick-closing valve for a steam turbine is disclosed. The valve body of the quick-closing valve has an air inlet and an air outlet. A flange connection surface is provided at the end face of the air outlet. The quick-closing valve has a valve stem one and a valve stem two. One end of the valve stem one is connected to a butterfly valve, and the other end of the valve stem one extends into the valve cover and is connected to one end of the valve stem two through a nut assembly. The other end of the valve stem two extends into the oil cylinder and is connected to a piston assembly.

[0004] The quick-closing valve in the above case does not have the effect of filtering steam. Solid impurities in the steam, such as rust, welding slag, and metal particles, directly enter the valve body, which may cause the valve disc to stick and fail. Moreover, the high-speed steam carries impurities and washes over the sealing surface, causing wear and leakage. Therefore, we provide a quick-closing valve for steam turbines. Utility Model Content

[0005] The purpose of this invention is to provide a turbine quick-closing valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a turbine quick-closing valve, comprising a valve body, a fixed shell connected to the valve body is installed on the air inlet pipe at the top of the valve body, a filter connection assembly is provided inside the fixed shell, a sealing and limiting assembly is provided on the fixed shell, and an air guide pipe connected to the fixed shell is installed on the top of the fixed shell.

[0007] Preferably, the filter connection assembly includes a mounting frame disposed inside the fixed housing, a pluggable filter screen is disposed inside the mounting frame, and a top block is mounted on the right side of the inner wall of the fixed housing and at the bottom of the mounting frame.

[0008] Preferably, the sealing and limiting assembly includes a sealing plate, which is disposed on the left side of the fixed shell and corresponds to the position of the mounting frame. The right side of the sealing plate penetrates the fixed shell and extends into its interior. Fixing blocks are installed on the right side of the sealing plate and at the top and bottom of the mounting frame.

[0009] Preferably, a slot is provided on the front side of the fixing block and on the side near the mounting frame. The top and bottom of the mounting frame are both equipped with slot-matching blocks. The side of the block near the slot passes through the slot and extends into it, contacting the inner wall of the slot.

[0010] Preferably, a connecting block is installed on the left side of the mounting frame, and a fastening bolt that is threadedly connected to the sealing plate is provided on the top of the connecting block. A traction rope is installed at the bottom of the mounting frame, and a sealing baffle that is compatible with the sealing plate is installed at the bottom of the traction rope.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention effectively intercepts solid impurities such as rust, welding slag, and metal particles in steam through a filter screen inside the fixed housing, preventing impurities from entering the valve body and causing valve disc jamming or wear on the sealing surface. At the same time, it is convenient to remove the filter screen from the fixed housing for maintenance or replacement. The filter screen and the mounting frame are independent components, and worn or clogged filter screens can be replaced separately, reducing the cost of use and improving practicality. Attached Figure Description

[0013] Figure 1 This is a structural cross-sectional view of the front view of this utility model;

[0014] Figure 2 This is a three-dimensional structural diagram of the sealing and limiting component of this utility model;

[0015] Figure 3 This is a three-dimensional structural schematic diagram of the side view of the mounting frame of this utility model;

[0016] Figure 4 This is a structural cross-sectional view of the front view of the fixed shell, filter connection assembly, and sealing limiting assembly of this utility model;

[0017] Figure 5 This is a structural cross-sectional view of the fixing block, slot, locking block, positioning block, and positioning groove of this utility model.

[0018] In the diagram: 1 Valve body, 100 Inlet pipe, 101 Fixed shell, 102 Air guide pipe, 2 Filter connection assembly, 21 Mounting frame, 22 Filter screen, 23 Top block, 3 Sealing limit assembly, 31 Sealing plate, 32 Fixed block, 33 Slot, 34 Slot, 35 Connecting block, 36 Fastening bolt, 37 Traction rope, 38 Sealing baffle, 4 Slide groove, 5 Slide rod, 6 Slider, 7 Buffer spring, 8 Pull plate, 9 Positioning block, 10 Positioning groove. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-5 A turbine quick-closing valve includes a valve body 1. An inlet pipe 100 at the top of the valve body 1 is fixedly connected to and communicates with the inlet pipe 100. A filter connection assembly 2 is provided inside the fixed housing 101. A sealing and limiting assembly 3 is provided on the fixed housing 101. An air guide pipe 102 is fixedly connected to and communicates with the fixed housing 101. Flanges are installed on the top of the air guide pipe 102 and the outlet pipe on the left side of the valve body 1 to facilitate connection with external pipelines.

[0021] The filter connection assembly 2 includes a mounting frame 21, which is disposed inside the fixed housing 101. The surface of the mounting frame 21 is in contact with the inner wall of the fixed housing 101. A pluggable filter screen 22 is disposed inside the mounting frame 21, and the surface of the filter screen 22 is in contact with the inner wall of the mounting frame 21. A top block 23 is fixedly connected to the right side of the inner wall of the fixed housing 101 and located at the bottom of the mounting frame 21. The top of the top block 23 is in contact with the bottom of the mounting frame 21. By setting the top block 23, the mounting frame 21 is supported. The filter screen 22 is made of stainless steel mesh with a mesh size of 80-120 mesh and is also heat resistant.

[0022] The sealing and limiting assembly 3 includes a sealing plate 31, which is located on the left side of the fixed housing 101 and corresponds to the position of the mounting frame 21. The side of the sealing plate 31 closest to the fixed housing 101 is in contact with the fixed housing 101, the right side of the sealing plate 31 is in contact with the left side of the mounting frame 21, and the right side of the sealing plate 31 is in contact with the left side of the filter screen 22. The right side of the sealing plate 31 penetrates the fixed housing 101 and extends into it. Fixing blocks 32 are fixedly connected to the right side of the sealing plate 31 at the top and bottom of the mounting frame 21. The side of the fixing block 32 closest to the mounting frame 21 is in contact with the mounting frame 21. A slot 33 is provided on the front side of the fixing block 32 closest to the mounting frame 21. A matching slot block 34 is fixedly connected to the top and bottom of the mounting frame 21. The side of the slot block 34 closest to the slot 33 penetrates the slot 33 and extends into it, contacting the inner wall of the slot 33.

[0023] A groove 4 is provided on the right side of the top fixing block 32. The top and bottom of the inner wall of the groove 4 are fixedly connected by a sliding rod 5. A slider 6 is slidably connected to the surface of the sliding rod 5. A buffer spring 7 is sleeved on the surface of the sliding rod 5. A pull plate 8 is fixedly connected to the right side of the slider 6. A positioning block 9 is fixedly connected to the bottom of the pull plate 8. A positioning groove 10 is provided on the side of the top locking block 34 near the positioning block 9. The side of the positioning block 9 near the positioning groove 10 passes through the top locking groove 33 and the positioning groove 10 in sequence and extends into the interior of the positioning groove 10, contacting the inner wall of the positioning groove 10. By setting the groove 4, sliding rod 5, slider 6, buffer spring 7, pull plate 8, positioning block 9 and positioning groove 10, the stability of the locking block 34 inserted into the locking groove 33 is improved, thereby ensuring the stability when the mounting frame 21 and the fixing block 32 are connected. By setting the buffer spring 7, the elasticity of the buffer spring 7 ensures the stability of the positioning block 9 inserted into the positioning groove 10.

[0024] A connecting block 35 is fixedly connected to the left side of the mounting frame 21. The top of the connecting block 35 is provided with a fastening bolt 36 that is threadedly connected to the sealing plate 31. A traction rope 37 is fixedly connected to the bottom of the mounting frame 21. A sealing baffle 38 that is compatible with the sealing plate 31 is fixedly connected to the bottom of the traction rope 37. The sealing baffle 38 has a threaded hole that is used to cooperate with the fastening bolt 36. By setting the sealing baffle 38, when the sealing plate 31 is disassembled from the mounting frame 21, the sealing baffle 38 can seal the opening on the left side of the fixing shell 101 that is inserted into the mounting frame 21.

[0025] The filter screen 22 inside the fixed housing 101 can effectively intercept solid impurities such as rust, welding slag, and metal particles in the steam, preventing impurities from entering the valve body 1 and causing valve disc jamming or wear on the sealing surface. At the same time, it is convenient to remove the filter screen 22 from the fixed housing 101 for maintenance or replacement. The filter screen 22 and the mounting frame 21 are independent components, and worn or clogged filter screens can be replaced separately, reducing the cost of use and improving practicality.

[0026] When in use, open the steam valve so that steam enters the fixed shell 101 from the air inlet pipe 100. After being filtered by the filter screen 22, steam enters the valve body 1 through the air guide pipe 102. Impurities are intercepted on the filter screen 22. The filter screen 22 should be disassembled, cleaned or replaced regularly. When disassembling the filter screen 22, the machine needs to be stopped and the pressure released.

[0027] Loosen the fastening bolt 36, and then pull the sealing plate 31 to the left. The sealing plate 31 will pull the mounting frame 21 and the filter screen 22 out of the fixed shell 101. Then the sealing baffle 38 will seal the opening on the left side of the fixed shell 101 to prevent external impurities from entering. The sealing baffle 38 will be fixed by the fastening bolt 36.

[0028] Then pull the pull plate 8 upwards. The pull plate 8 drives the slider 6 to press the buffer spring 7 upwards. The pull plate 8 drives the positioning block 9 upwards, causing the positioning block 9 and the positioning groove 10 to separate. Then, pull the mounting frame 21 forwards. The mounting frame 21 drives the locking block 34 forwards, causing the locking block 34 and the locking groove 33 to separate. This separates the mounting frame 21 from the sealing plate 31. Then, pull the filter screen 22 to the left to remove the filter screen 22 from the mounting frame 21 for cleaning and maintenance.

[0029] 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 quick closing valve for a steam turbine, characterized by: Includes a valve body (1), on which an air inlet pipe (100) at the top of the valve body (1) is a fixed shell (101) that communicates with it. Inside the fixed shell (101) is a filter connection assembly (2), on which a sealing and limiting assembly (3) is provided, and on the top of the fixed shell (101) is an air guide pipe (102) that communicates with it.

2. The turbine quick-closing valve according to claim 1, characterized in that: The filter connection assembly (2) includes a mounting frame (21), which is disposed inside the fixed shell (101). A pluggable filter screen (22) is disposed inside the mounting frame (21). A top block (23) is installed on the right side of the inner wall of the fixed shell (101) and at the bottom of the mounting frame (21).

3. The turbine quick-closing valve according to claim 2, characterized in that: The sealing and limiting assembly (3) includes a sealing plate (31), which is located on the left side of the fixed shell (101) and corresponds to the position of the mounting frame (21). The right side of the sealing plate (31) penetrates the fixed shell (101) and extends into its interior. Fixing blocks (32) are installed on the right side of the sealing plate (31) and at the top and bottom of the mounting frame (21).

4. The turbine quick-closing valve according to claim 3, characterized in that: The fixing block (32) has a slot (33) on its front side and near the mounting frame (21). The mounting frame (21) has a slot (34) on its top and bottom that is compatible with the slot (33). The slot (34) extends through the slot (33) and into its interior, contacting the inner wall of the slot (33).

5. The turbine quick-closing valve according to claim 4, characterized in that: A connecting block (35) is installed on the left side of the mounting frame (21). The top of the connecting block (35) is provided with a fastening bolt (36) that is threadedly connected to the sealing plate (31). A traction rope (37) is installed at the bottom of the mounting frame (21). A sealing baffle (38) that is compatible with the sealing plate (31) is installed at the bottom of the traction rope (37).

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