A leakage-proof valve for a boiler water-steam system

Abstract

The utility model relates to the technical field of governing valve, especially a prevent leakage valve for boiler steam water system, including the valve body, the valve body includes the valve body and the valve cover, is equipped with the valve rod extending to the outside on the valve cover and passes, be provided with the valve plate on the valve rod still include: zinc ring, adopt two half rings and half -enclose on the exposed part of valve rod, install and dismount the subassembly, the utility model discloses through the zinc ring of additional installation, will become the sacrificial anode in the electrolyte environment of boiler steam water system application, actively replace the valve cover and the valve rod and bear all corrosion current, and because the valve cover and the valve rod have been protected, its surface keeps neat, will not produce corrosion product, this ensures that the longer service life and better sealing effect between the smooth valve rod and the packing, effectively prevent the leakage, make the screw pair on the valve cover can long -term keep its mechanical integrity and detachability, and it is important for the maintenance and life of valve.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, and in particular to a leak-proof valve for boiler steam-water systems. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] The boiler steam-water system is the core of the power plant's power system. The high-temperature and high-pressure valves in the system (such as the superheater desuperheating water regulating valve, the water level regulating valve of the storage tank, the electric valve of the soot blowing header, and the electromagnetic relief valve of the superheater, etc.) are key actuators to ensure the safe, stable, and economical operation of the unit.

[0004] Currently, in the electrolyte environment of a boiler steam-water system, the valve stem (usually made of stainless steel) comes into direct contact with dissimilar metal components such as the valve cover and valve stem nut (usually made of carbon steel), spontaneously forming a macroscopic electrocouple cell. In this cell, the valve stem, with its relatively more negative potential, becomes the anode, thus continuously and irreversibly subjected to corrosion current erosion. This leads to the destruction of the valve stem surface integrity and external leakage problems caused by dynamic seal failure. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned shortcomings by providing a leak-proof valve for boiler steam-water systems.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a leak-proof valve for a boiler steam-water system, comprising a valve body, the valve body including a valve body and a valve cover, a valve stem extending to the outside passing through the valve cover, a valve plate corresponding to the end of the valve stem within the valve body, and further comprising: A zinc ring, consisting of two half-rings that partially cover the exposed portion of the valve stem, is used as a sacrificial anode to provide electrochemical protection for the valve stem. An installation / removal assembly is provided on the valve cover to connect the zinc ring and the valve cover to form an electrical connection.

[0007] Furthermore, a stuffing box for accommodating a packing seal is provided at the passage position through which the valve stem passes on the valve cover, and a splicing assembly is provided at the stuffing box for splicing the two half-rings that cover the outside of the valve stem.

[0008] Furthermore, the splicing assembly includes a first elastic ring located within one of the semi-rings and a second elastic ring located within the other semi-ring. Both the first and second elastic rings are provided with notches for unfolding and horizontally covering the stuffing box. A sliding arc groove is provided on the inner surface of the first elastic ring corresponding to the notch. An arc plate is provided in the sliding arc groove for rotational shifting. An insertion block is provided on the second elastic ring at a position opposite to and away from the notch. The arc plate is provided with a socket adapted for horizontal insertion of the insertion block along the radial line.

[0009] Furthermore, the installation and removal assembly includes two symmetrical fixing plates fixed on the valve cover, a 7-shaped plate disposed on the fixing plates and positioned close to the valve stem, and a square groove for embedding the 7-shaped plate is provided on the surface of the semi-ring corresponding to the valve cover.

[0010] Furthermore, a limiting arc groove is provided along the circumference of the semi-ring, which is used to rotate relative to the 7-shaped plate and limit the semi-ring to be fixed on the fixed plate.

[0011] Furthermore, the 7-shaped plate includes a vertical plate perpendicular to and disposed at the end of the fixed plate and a horizontal plate parallel to the fixed plate and perpendicularly connected to the top of the vertical plate, and the size of the bottom opening of the square groove matches the size of the horizontal plate.

[0012] The beneficial effects of this utility model are reflected in: This invention, through the addition of a zinc ring, acts as a sacrificial anode in the electrolyte environment of a boiler steam-water system, actively replacing the valve cover and valve stem to bear all corrosion currents. Furthermore, because the valve cover and valve stem are protected, their surfaces remain smooth and do not produce corrosion products. This ensures a longer service life and better sealing effect between the smooth valve stem and the packing, effectively preventing leakage. Simultaneously, it allows the threaded joint on the valve cover to maintain its mechanical integrity and removability for a long time, which is crucial for valve maintenance and lifespan. Attached Figure Description

[0013] Figure 1 This is a perspective view of the overall structure of an embodiment of the present utility model. Figure 2 This is a three-dimensional structural view of the zinc ring on the valve cover from a separate perspective, according to an embodiment of the present invention. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a perspective view of the zinc ring separation according to an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of zinc ring separation from another perspective of an embodiment of the present invention.

[0014] In the picture: 1. Valve cover; 2. Valve stem; 3. Zinc ring; 4. Installation and removal assembly; 41. Fixing plate; 42. L-shaped plate; 421. Vertical plate; 422. Horizontal plate; 43. Square groove; 44. Limiting arc groove; 5. Stuffing box; 6. Splicing assembly; 61. First elastic ring; 611. Sliding arc groove; 612. Arc plate; 6121. Socket; 62. Second elastic ring; 621. Insert block; 63. Notch. Detailed Implementation

[0015] 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 a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. 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 scope of protection of the present utility model.

[0016] Please see Figure 1-5 This utility model discloses a leakage prevention valve applied in a boiler steam-water system, including a valve body, the valve body comprising a valve body and a valve cover 1, a valve stem 2 extending to the outside of the valve cover 1, and a valve plate corresponding to the end of the valve stem 2 within the valve body, and further comprising: Zinc ring 3, consisting of two semi-rings that partially cover the exposed portion of valve stem 2, is used as a sacrificial anode to provide electrochemical protection for valve stem 2. The installation and removal component 4 is installed on the valve cover 1 and is used to connect the zinc ring 3 and the valve cover 1 to form an electrical connection.

[0017] In practice, a complete zinc ring 3 is formed by installing two semi-rings to partially cover the exposed portion of the valve stem 2. The zinc ring 3 is then installed on the valve cover 1 using the installation / removal assembly 4, ensuring good electrical conductivity between the zinc ring 3 and the valve cover 1 and valve stem 2. In the electrolyte environment of the boiler steam-water system, the zinc ring 3 exhibits a more negative electrode potential than most materials of the valve cover 1 and valve stem 2. Therefore, the zinc ring 3 acts as a sacrificial anode, actively bearing all corrosion current for the valve cover 1 and valve stem 2, as electrons flow out from the zinc ring 3, thus protecting the valve cover 1 and valve stem 2. Furthermore, since the valve cover 1 and valve stem 2 are protected and their surfaces remain smooth, no corrosion products are generated. This ensures a longer service life and better sealing effect between the smooth valve stem 2 and the packing, effectively preventing leakage. At the same time, it allows the threaded pair on the valve cover 1 to maintain its mechanical integrity and removability for a long time, which is crucial for valve maintenance and lifespan.

[0018] In one embodiment, a stuffing box 5 for accommodating a packing seal is provided at the passage position of the valve stem 2 on the valve cover 1. A splicing assembly 6 is provided at the stuffing box 5 for the two semi-rings, which splice the two semi-rings that partially cover the outside of the valve stem 2. This design, by installing the stuffing box 5 at the passage position of the valve stem 2 on the valve cover 1, forms a sealing barrier to prevent leakage of the process medium inside the valve. The splicing component 6 installed between the two semi-rings can serve as an independent, standardized additional protection module on the valve body. This function can be "added" to the valve body at any time without making any structural modifications to the existing valve body or disassembling the valve stem 2 or the actuator. It is flexible and easy to maintain.

[0019] In one embodiment, the splicing assembly 6 includes a first elastic ring 61 located within one of the semi-rings and a second elastic ring 62 located within the other semi-ring. Both the first elastic ring 61 and the second elastic ring 62 are provided with notches 63 for unfolding and horizontally covering the stuffing box 5. The inner surface of the first elastic ring 61 corresponding to the notch 63 is provided with a sliding arc groove 611. An arc plate 612 is rotatably and phase-shifted within the sliding arc groove 611. An insert 621 is provided on the second elastic ring 62 at a position opposite to and away from the notch 63. The arc plate 612 is provided with a socket 6121 adapted to allow the insert 621 to be inserted horizontally along the radial line. This design involves welding a first elastic ring 61 and a second elastic ring 62 to the two half-rings respectively, and creating notches 63 on the first and second elastic rings 61 and 62. These notches 63 allow both the first and second elastic rings 61 and 62 to cover the outside of the stuffing box 5, while the second elastic ring 62 covers the outside of the first elastic ring 61. Then, the insert 621 welded inside the second elastic ring 62 is horizontally inserted into the corresponding slot 6121 machined on the rotating arc plate 612 on the inner surface of the first elastic ring 61, allowing the two half-rings to be joined together in the radial horizontal direction.

[0020] It should be noted that the sliding arc groove 611 is machined on the inner surface of the first elastic ring 61 at the position of the corresponding notch 63, and the sliding arc groove 611 at the position of the notch 63 is disconnected. The arc plate 612 moves and rotates along the circumference of the first elastic ring 61 at the sliding arc groove 611 to close the notch 63. The insertion port 6121 machined on the arc plate 612 is inserted and fixed to the insertion block 621.

[0021] In one embodiment, the installation / removal assembly 4 includes two symmetrical fixing plates 41 fixed to the valve cover 1, and a 7-shaped plate 42 disposed on the fixing plates 41 and positioned close to the valve stem 2. A square groove 43 for embedding the 7-shaped plate 42 is provided on the surface of the semi-ring corresponding to the valve cover 1. This design, with the two fixing plates 41 symmetrically positioned on the valve cover 1 and installed with screws, and the 7-shaped plate 42 welded to the inner end of the fixing plates 41, allows the complete zinc ring 3, which is assembled and connected to the outside of the valve stem 2, to be lowered. This ensures that the square groove 43, machined on the bottom surface of the semi-ring, is directly aligned with the 7-shaped plate 42 for insertion, guaranteeing an interference fit between the square groove 43 and the 7-shaped plate 42.

[0022] In one embodiment, a limiting arc groove 44 is provided circumferentially within the semi-ring. The limiting arc groove 44 is used to rotate relative to the 7-shaped plate 42 and to fix the semi-ring to the fixed plate 41. This design, by machining a limiting arc groove 44 communicating with a square groove 43 within the semi-ring circumferentially, allows the 7-shaped plate 42 to move relative to the square groove 43 after the 7-shaped plate 42 and square groove 43 are correspondingly combined. Rotating the zinc ring 3 can move the 7-shaped plate 42 along the arc direction inside the limiting arc groove 44, thus limiting the connection of the 7-shaped plate 42 within the limiting arc groove 44. This achieves convenient installation and removal of the zinc ring 3 on the valve cover 1, leveraging the modular advantages of installation and removal for simple operation.

[0023] In one embodiment, the 7-shaped plate 42 includes a vertical plate 421 perpendicular to and disposed at the end of the fixed plate 41, and a horizontal plate 422 parallel to the fixed plate 41 and perpendicularly connected to the top of the vertical plate 421. The size of the bottom opening of the square groove 43 matches the size of the horizontal plate 422. This design, with the vertical plate 421 vertically welded to the end of the fixed plate 41 near the valve stem 2, and the horizontal plate 422 vertically and horizontally welded to the top of the vertical plate 421, wherein the size of the horizontal plate 422 matches the slot size of the square groove 43, allows the 7-shaped plate 42 to be vertically inserted into the square groove 43 machined on the bottom surface of the spliced ​​zinc ring 3.

[0024] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0025] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] Additionally, "multiple" refers to two or more.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leak-proof valve for a boiler steam-water system, comprising a valve body, the valve body including a valve body and a valve cover (1), a valve stem (2) extending to the outside being disposed on the valve cover (1), and a valve plate corresponding to the end of the valve stem (2) within the valve body being disposed thereon, characterized in that, Also includes: A zinc ring (3), consisting of two half-rings that wrap around the exposed portion of the valve stem (2), is used as a sacrificial anode to provide electrochemical protection for the valve stem (2). The installation and removal assembly (4) is installed on the valve cover (1) to connect the zinc ring (3) and the valve cover (1) to form an electrical connection.

2. The anti-leakage valve for a boiler steam-water system according to claim 1, characterized in that: A stuffing box (5) for accommodating a stuffing seal is provided at the passage position through which the valve stem (2) passes on the valve cover (1). A splicing assembly (6) is provided at the stuffing box (5) for the two half-rings. The splicing assembly (6) is used to splice the two half-rings that cover the outside of the valve stem (2).

3. The anti-leakage valve for a boiler steam-water system according to claim 2, characterized in that: The splicing assembly (6) includes a first elastic ring (61) located in one half ring and a second elastic ring (62) located in the other half ring. Both the first elastic ring (61) and the second elastic ring (62) are provided with notches (63) for unfolding and horizontally covering the stuffing box (5). The inner surface of the first elastic ring (61) corresponding to the notch (63) is provided with a sliding arc groove (611). An arc plate (612) is provided in the sliding arc groove (611) for rotational phase shift. An insert (621) is provided on the second elastic ring (62) at a position opposite to and away from the notch (63). The arc plate (612) is provided with a socket (6121) adapted to the horizontal insertion of the insert (621) along the radial line.

4. The anti-leakage valve for a boiler steam-water system according to claim 1, characterized in that: The installation and removal assembly (4) includes two symmetrical fixing plates (41) fixed on the valve cover (1), a 7-shaped plate (42) is provided on the fixing plate (41) and close to the valve stem (2), and a square groove (43) for embedding the 7-shaped plate (42) is provided on the surface of the semi-ring corresponding to the valve cover (1).

5. The anti-leakage valve for a boiler steam-water system according to claim 4, characterized in that: A limiting arc groove (44) is provided along its circumference inside the semi-ring. The limiting arc groove (44) is used to rotate relative to the 7-shaped plate (42) and limit the semi-ring to be fixed on the fixed plate (41).

6. The anti-leakage valve for a boiler steam-water system according to claim 4, characterized in that: The 7-shaped plate (42) includes a vertical plate (421) perpendicular to and located at the end of the fixed plate (41) and a horizontal plate (422) parallel to the fixed plate (41) and vertically connected to the top of the vertical plate (421). The size of the bottom opening of the square groove (43) matches the size of the horizontal plate (422).

Images