Anti-erosion structure of sealing surface of steam valve

Abstract

The utility model relates to a steam valve technical field, specifically is a steam valve sealing surface anti scouring structure, the utility model discloses the valve disc in the cut -off valve body and the inner chamber of cut -off valve body, the air inlet end and the air outlet of cut -off valve body are all fixedly connected with first flange. The utility model discloses the communication pipe of turbulence round plate, metal filter plate and setting, when steam flows through the communication pipe of having multiple groups turbulence round plate, the aperture of turbulence round plate can make the flow channel section of steam change, forms the throttling effect, and steam is accelerated when passing through the aperture, then collides with adjacent turbulence round plate, because of the blocking effect of turbulence round plate, the pressure and flow rate of steam will reduce, thereby reducing the scouring energy of valve disc sealing surface in later period, and the impurities in steam are intercepted simultaneously with metal filter plate, avoid the friction of impurities to valve disc sealing surface, further play the effect of protecting the sealing surface.

Description

Technical Field

[0001] This utility model relates to the field of steam valve technology, specifically to an anti-erosion structure for the sealing surface of a steam valve. Background Technology

[0002] The sealing surface of a steam shut-off valve is the precision-fitting area between the moving valve core and the fixed valve seat inside the valve. Its main function is to control the flow of steam. When the valve is closed, the two fit tightly together, blocking the flow of steam; when open, they separate, providing a flow path for steam. Its sealing performance and durability directly determine whether the valve can work stably, making it a core component that ensures the normal operation of the steam system.

[0003] In the operation of steam valves, the sealing surface is the core component for controlling the steam flow. However, it is easily affected by high-speed steam erosion, particle abrasion and cavitation. Traditional sealing surfaces lack targeted protection and are prone to wear and scratches after long-term use, leading to sealing failure and valve leakage, which makes it difficult to meet the long-term stable operation requirements of steam systems. To address this, we propose an anti-erosion structure for steam valve sealing surfaces. Utility Model Content

[0004] The purpose of this invention is to provide an anti-erosion structure for the sealing surface of a steam valve to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A steam valve sealing surface anti-erosion structure includes a shut-off valve body and a valve disc located in the inner cavity of the shut-off valve body. The inlet and outlet ends of the shut-off valve body are both fixedly connected to a first flange. The surface of the first flange located at the inlet end is movably fitted with a second flange. The end of the second flange away from the shut-off valve body is fixedly connected to a connecting pipe. The inner cavity of the connecting pipe is provided with a buffer assembly.

[0007] The valve disc moves up and down within the inner cavity of the shut-off valve body to block the gas passage.

[0008] The buffer assembly includes a second threaded rod and two abutment rings. The two ends of the second threaded rod are threadedly connected to the center of the two abutment rings respectively. Multiple turbulence-disrupting circular plates are threadedly connected to the threaded surface of the second threaded rod, and a metal filter plate is also threadedly connected to the threaded surface of the second threaded rod.

[0009] The circumferential surfaces of both abutment rings are in movable contact with the inner wall of the connecting pipe.

[0010] Preferably, the buffer apertures of the plurality of turbulence discs are different, and the aperture of each turbulence disc is smaller the closer it is to the shut-off valve body. The metal filter plate is located on the second threaded rod closest to the shut-off valve body.

[0011] Preferably, the inner cavity of the connecting pipe is fixedly connected to a limiting ring, and two sliding grooves are symmetrically opened on the inner wall of the connecting pipe. A limiting block is slidably connected in each of the two sliding grooves. A first threaded rod is rotatably connected to the side of each of the two limiting blocks that is far apart from each other. The surfaces of the two first threaded rods are threadedly connected to the wall of the connecting pipe, and a rotating rod is fixedly connected to the end of each of the two first threaded rods that is far apart from each other.

[0012] Preferably, the two abutting rings are in movable contact with the limiting ring and the limiting block, respectively.

[0013] Preferably, a bolt is movably fitted onto both the first flange and the second flange, and a nut is threaded onto the end of the bolt.

[0014] Preferably, a third flange is fixedly connected to the end of the connecting pipe away from the shut-off valve body.

[0015] The beneficial effects of this utility model are:

[0016] This invention utilizes a combination of baffle plates, metal filter plates, and connecting pipes. When steam flows through a connecting pipe with multiple baffle plates, the holes in the baffle plates alter the cross-section of the steam flow channel, creating a throttling effect. The steam velocity increases as it passes through the holes and then collides with adjacent baffle plates. Due to the blocking effect of the baffle plates, the steam pressure and velocity decrease, thereby reducing the scouring energy on the valve disc sealing surface. Simultaneously, the metal filter plates intercept impurities in the steam, preventing them from rubbing against the valve disc sealing surface and further protecting the sealing surface. This design helps meet the long-term stable operation requirements of the steam system. Attached Figure Description

[0017] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the shut-off valve body of this utility model;

[0020] Figure 3 This is a three-dimensional partially exploded structural diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the connecting tube of this utility model;

[0022] Figure 5 This is a utility model Figure 3 A partially enlarged structural diagram.

[0023] The following are the reference numerals in the attached diagram: 1. Gate valve body; 2. First flange; 3. Second flange; 4. Connecting pipe; 5. Third flange; 6. First threaded rod; 7. Rotating rod; 8. Slide groove; 9. Limiting block; 10. Limiting ring; 11. Abutment ring; 12. Second threaded rod; 13. Turbulence plate; 14. Metal filter plate; 15. Valve disc. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1-5 As shown, a steam valve sealing surface anti-erosion structure includes a gate valve body 1 and a valve disc 15 located inside the gate valve body 1. A first flange 2 is fixedly connected to both the inlet and outlet ends of the gate valve body 1. A second flange 3 is movably fitted onto the surface of the first flange 2 at the inlet end. A connecting pipe 4 is fixedly connected to the end of the second flange 3 away from the gate valve body 1. A buffer assembly is provided inside the connecting pipe 4. The valve disc 15 moves up and down within the gate valve body 1 to block the gas passage. The buffer assembly includes a second threaded rod 12 and two abutment rings 11. The ends are threadedly connected to the center of the two abutment rings 11 respectively. Multiple turbulence-inducing circular plates 13 are threadedly connected to the threaded surface of the second threaded rod 12. A metal filter plate 14 is also threadedly connected to the threaded surface of the second threaded rod 12. The circumferential surfaces of the two abutment rings 11 are in movable contact with the inner wall of the connecting pipe 4. The buffer orifice diameters of the multiple turbulence-inducing circular plates 13 are different, and the closer each turbulence-inducing circular plate 13 is to the stop valve body 1, the smaller its orifice diameter. The metal filter plate 14 is located on the second threaded rod 12 at the position closest to the stop valve body 1. A third flange 5 is fixedly connected to the end of the connecting pipe 4 away from the stop valve body 1.

[0026] It should be noted that the surfaces of both the turbulence disc 13 and the metal filter plate 14 are coated with a nickel-based alloy coating.

[0027] In specific implementation, when steam flows through the connecting pipe 4 with multiple sets of turbulence-disrupting circular plates 13, the holes of the turbulence-disrupting circular plates 13 will change the cross-section of the steam flow channel, forming a throttling effect. When the steam passes through the holes, the flow velocity increases, and then it collides with the adjacent turbulence-disrupting circular plates 13. Due to the blocking effect of the turbulence-disrupting circular plates 13, the pressure and flow velocity of the steam will decrease, thereby reducing the scouring energy on the sealing surface of the valve disc 15 in the later stage. At the same time, the metal filter plate 14 is used to intercept impurities in the steam, avoiding impurities from rubbing against the sealing surface of the valve disc 15, and further protecting the sealing surface.

[0028] According to the specified buffering requirements, an appropriate number of baffle discs 13 can be installed on the second threaded rod 12 for use.

[0029] As a technical optimization of this utility model, the inner cavity of the connecting pipe 4 is fixedly connected to a limiting ring 10, and two sliding grooves 8 are symmetrically opened on the inner wall of the connecting pipe 4. A limiting block 9 is slidably connected in each of the two sliding grooves 8. A first threaded rod 6 is rotatably connected to the side of the two limiting blocks 9 that is far apart from each other. The surfaces of the two first threaded rods 6 are threadedly connected to the pipe wall of the connecting pipe 4. A rotating rod 7 is fixedly connected to the end of the two first threaded rods 6 that is far apart from each other. Two abutting rings 11 are movably abutting against the limiting ring 10 and the limiting block 9 respectively. Bolts are movably sleeved on the first flange 2 and the second flange 3, and nuts are threadedly sleeved on the ends of the bolts.

[0030] In specific implementation, by installing multiple turbulence-disrupting circular plates 13 and metal filter plates 14 on the second threaded rod 12, the distance between the multiple turbulence-disrupting circular plates 13 can be reasonably controlled through the threaded installation method, which enhances the practicality of the device. By installing two abutting rings 11 on the two ends of the second threaded rod 12 respectively, one abutting ring 11 is made to fit with the limiting ring 10, and then the first threaded rod 6 is rotated to drive the limiting block 9 to move and abut against the other abutting ring 11. The buffer assembly can be installed in the inner cavity of the connecting pipe 4 for use.

[0031] By rotating the first threaded rod 6 in the opposite direction to move the limiting block 9, the limiting block 9 can be removed from the abutment ring 11. Then, the second flange 3 can be removed to take out the buffer assembly inside the connecting pipe 4, thereby cleaning or replacing the turbulence disc 13 or the metal filter plate 14.

[0032] In use, this invention involves installing multiple turbulence-disrupting circular plates 13 and a metal filter plate 14 on a second threaded rod 12. The distance between the multiple turbulence-disrupting circular plates 13 is reasonably controlled through threaded installation. Two abutment rings 11 are respectively installed on both ends of the second threaded rod 12, allowing one abutment ring 11 to fit against the limiting ring 10. Then, the first threaded rod 6 is rotated to move the limiting block 9 to abut against the other abutment ring 11. The buffer assembly is installed in the inner cavity of the connecting pipe 4 for use. When steam flows through the connecting pipe 4 with multiple sets of turbulence-disrupting circular plates 13, the holes in the turbulence-disrupting circular plates 13 will change the cross-section of the steam flow channel, creating a throttling effect. The steam velocity increases when passing through the holes and then collides with the adjacent turbulence-disrupting circular plates 13. Due to the blocking effect of the turbulence-disrupting circular plates 13, the steam pressure and velocity will decrease, thereby reducing the scouring energy on the sealing surface of the valve disc 15 in the later stage. At the same time, the metal filter plate 14 is used to intercept impurities in the steam, preventing impurities from rubbing against the sealing surface of the valve disc 15.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall under the protection of the claims.

Claims

1. A steam valve sealing surface anti-erosion structure, comprising a gate valve body (1) and a valve disc (15) located within the inner cavity of the gate valve body (1), characterized in that, The inlet and outlet ends of the shut-off valve body (1) are both fixedly connected to a first flange (2). The surface of the first flange (2) located at the inlet end is movably fitted with a second flange (3). The end of the second flange (3) away from the shut-off valve body (1) is fixedly connected to a connecting pipe (4). The inner cavity of the connecting pipe (4) is provided with a buffer assembly. The valve disc (15) moves up and down within the inner cavity of the shut-off valve body (1) to block the gas passage; The buffer assembly includes a second threaded rod (12) and two abutment rings (11). The two ends of the second threaded rod (12) are threadedly connected to the center of the two abutment rings (11) respectively. Multiple turbulence circular plates (13) are threadedly connected to the threaded surface of the second threaded rod (12). A metal filter plate (14) is also threadedly connected to the threaded surface of the second threaded rod (12). The circumferential surfaces of the two abutment rings (11) are in movable contact with the inner wall of the connecting pipe (4).

2. The anti-erosion structure for the sealing surface of a steam valve according to claim 1, characterized in that, The buffer apertures of the multiple turbulence discs (13) are different, and the closer each turbulence disc (13) is to the shut-off valve body (1), the smaller its aperture is. The metal filter plate (14) is located on the second threaded rod (12) closest to the shut-off valve body (1).

3. The anti-erosion structure for the sealing surface of a steam valve according to claim 2, characterized in that, The inner cavity of the connecting pipe (4) is fixedly connected to a limiting ring (10). The inner wall of the connecting pipe (4) is symmetrically provided with two sliding grooves (8). Each of the two sliding grooves (8) is slidably connected to a limiting block (9). The two limiting blocks (9) are rotatably connected to a first threaded rod (6) on the side away from each other. The surfaces of the two first threaded rods (6) are threadedly connected to the wall of the connecting pipe (4). The two ends of the two first threaded rods (6) are fixedly connected to a rotating rod (7).

4. The anti-erosion structure for the sealing surface of a steam valve according to claim 3, characterized in that, The two abutting rings (11) are respectively in contact with the limiting ring (10) and the limiting block (9).

5. The anti-erosion structure for the sealing surface of a steam valve according to claim 1, characterized in that, Bolts are movably fitted together on the first flange (2) and the second flange (3), and nuts are threaded onto the ends of the bolts.

6. The anti-erosion structure for the sealing surface of a steam valve according to claim 1, characterized in that, The end of the connecting pipe (4) away from the shut-off valve body (1) is fixedly connected to a third flange (5).

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