A stop valve stem with a leak-proof structure

Abstract

The utility model discloses a stop valve stem with prevent leaking structure belongs to stop valve stem technical field, and its technical scheme main points include stop valve body, the inside of stop valve body is provided with prevent leaking valve rod subassembly, prevent leaking valve rod subassembly includes fixed disc, the fixed disc is inlayed in the top of stop valve body, the bottom fixed connection of fixed disc has bellows seal pipe, the outside fixed connection of fixed disc bottom has the reinforcing seal cover, the bottom of reinforcing seal cover and the top side contact of stop valve body inside, and this application is through setting up bellows seal pipe and reinforcing seal cover, forms double -layer sealing structure, and bellows seal pipe can be along with the flexible deformation of valve rod body's opening and closing, always keeps and valve rod body, the close adhesion of valve clack, and reinforcing seal cover further blocks the gap between fixed disc and stop valve body, effectively solved the problem that the existing sealing structure is easy to wear, medium corrosion leads to the leakage, improved the sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of gate valve stem technology, and in particular to a gate valve stem with a leakage prevention structure. Background Technology

[0002] Gate valves, as key control components in fluid transport systems, are widely used in petroleum, chemical, water supply and drainage and other fields. Their sealing performance directly affects the safety and stability of system operation. The valve stem is the core transmission component of the gate valve. Through connection with the valve disc, the opening and closing control of the valve is realized.

[0003] However, during long-term use, the sealing structure of the existing gate valve stem is prone to wear due to repeated opening and closing of the valve stem. At the same time, media corrosion can cause damage to the valve stem surface, which in turn creates a sealing gap and causes media leakage. Furthermore, the traditional sealing structure lacks continuous lubrication protection, which increases frictional wear between the valve stem and the sealing element, further shortening the seal life. After leakage, it is necessary to shut down for inspection and replacement, which not only affects the continuity of production, but also increases maintenance costs and safety hazards.

[0004] To address this, a valve stem with a leak-proof structure for a gate valve is proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a gate valve stem with a leak-proof structure, which can solve the problems of existing gate valve stems, where the sealing structure is easily worn due to repeated opening and closing of the valve stem during long-term use, and the corrosion of the medium can cause damage to the valve stem surface, thus forming a sealing gap and causing medium leakage. In addition, the traditional sealing structure lacks continuous lubrication protection, which increases frictional wear between the valve stem and the sealing element, further shortening the sealing life. After leakage, the machine needs to be shut down for inspection and replacement, which not only affects the continuity of production, but also increases maintenance costs and safety hazards.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stop valve stem with an anti-leakage structure, comprising a stop valve body, wherein an anti-leakage valve stem assembly is provided inside the stop valve body; The anti-leakage valve stem assembly includes a fixed plate, which is embedded in the top of the shut-off valve body. A corrugated sealing tube is fixedly connected to the bottom of the fixed plate. A reinforcing sealing sleeve is fixedly connected to the outer side of the bottom of the fixed plate. The bottom of the reinforcing sealing sleeve contacts the top side of the interior of the shut-off valve body. The reinforcing sealing sleeve is located outside the corrugated sealing tube. A valve disc is fixedly connected to the bottom of the corrugated sealing tube. A cover plate is bolted to the top of the shut-off valve body. A rod frame is welded to the top of the cover plate. A sealing and lubrication structure is provided on the bottom side inside the rod frame. A valve stem body is threaded to the top of the rod frame. The bottom of the valve stem body passes through the interior of the sealing and lubrication structure, the fixed plate, and the corrugated sealing tube in sequence. The bottom of the valve stem body is fixedly connected to the top of the valve disc.

[0007] Preferably, the sealing and lubrication structure includes a sealing and lubrication sleeve embedded in the bottom side of the rod holder, and the inner wall of the sealing and lubrication sleeve is in close contact with the outer wall of the valve stem body.

[0008] Preferably, the top of the front side of the sealing lubrication sleeve is provided with a threaded oil injection hole, and the interior of the sealing lubrication sleeve is provided with a spiral oil groove.

[0009] Preferably, the spiral oil groove is filled with an oil-impregnated lubricating pad, and the threaded oil injection hole is threaded with a sealing bolt.

[0010] Preferably, a stabilizing pad is adhered to the top of the fixing plate, and the top of the stabilizing pad contacts the bottom of the cover plate.

[0011] Preferably, a handwheel is bolted to the top of the valve stem body, and an anti-slip sleeve is fitted on the outer side of the handwheel.

[0012] Preferably, a fixing block is fixedly connected in the middle inside the rod frame, and the inner hole of the fixing block is rotatably engaged with the valve stem body.

[0013] Preferably, the outer side of the valve stem body is coated with a wear-resistant coating.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This application forms a double sealing structure by setting a corrugated sealing tube and a reinforced sealing sleeve. The corrugated sealing tube can flexibly deform with the opening and closing of the valve stem body, and always maintains a tight fit with the valve stem body and valve disc. The reinforced sealing sleeve further seals the gap between the fixed plate and the shut-off valve body, effectively solving the problems of easy wear and leakage caused by medium corrosion in the existing sealing structure, and improving the sealing reliability. 2. By setting up a sealing and lubrication structure, this application not only enhances the sealing performance between the valve stem body and the stem holder, effectively preventing the medium from leaking from the gap, but also achieves continuous lubrication of the valve stem body, reduces frictional loss during the movement of the valve stem body, avoids damage to the sealing surface due to friction, thereby extending the service life of the sealing structure and the valve stem body, reducing the frequency of downtime for maintenance and replacement, ensuring production continuity while reducing maintenance costs and safety hazards. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the valve stem of the stop valve with a leak-proof structure according to this utility model. Figure 2 This is a structural diagram of the shut-off valve body of this utility model; Figure 3 This is a structural diagram of the anti-leakage valve stem assembly of this utility model; Figure 4 This is a structural diagram of the sealing and lubrication structure of this utility model; Figure 5 This is a structural diagram of the reinforced sealing sleeve of this utility model.

[0016] In the diagram, 1. Gate valve body; 2. Leak-proof valve stem assembly; 201. Fixed plate; 202. Bellows sealing pipe; 203. Reinforced sealing sleeve; 204. Valve disc; 205. Cover plate; 206. Stem holder; 207. Sealing and lubrication structure; 2071. Sealing and lubrication sleeve; 2072. Threaded oil injection hole; 2073. Spiral oil groove; 2074. Oil-immersed lubricating pad; 2075. Sealing bolt; 208. Valve stem body; 3. Stabilizing pad; 4. Handwheel; 5. Added fixing block. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1-5 The present invention provides the following technical solution: A valve stem of a stop valve with a leak-proof structure includes a stop valve body 1, and a leak-proof valve stem assembly 2 is provided inside the stop valve body 1. The anti-leakage valve stem assembly 2 includes a fixing plate 201, which is embedded in the top of the shut-off valve body 1. A corrugated sealing tube 202 is fixedly connected to the bottom of the fixing plate 201. A reinforcing sealing sleeve 203 is fixedly connected to the outer side of the bottom of the fixing plate 201. The bottom of the reinforcing sealing sleeve 203 contacts the top side inside the shut-off valve body 1. The reinforcing sealing sleeve 203 is located outside the corrugated sealing tube 202. A valve disc 204 is fixedly connected to the bottom of the corrugated sealing tube 202. A cover plate 205 is bolted to the top of the shut-off valve body 1. A rod frame 206 is welded to the top of the cover plate 205. A sealing and lubrication structure 207 is provided on the bottom side inside the rod frame 206. A valve stem body 208 is threadedly connected to the top of the rod frame 206. The bottom of the valve stem body 208 passes through the interior of the sealing and lubrication structure 207, the fixing plate 201, and the corrugated sealing tube 202 in sequence. The bottom of the valve stem body 208 is fixedly connected to the top of the valve disc 204.

[0019] In this embodiment: By setting up a shut-off valve body 1 and an anti-leakage valve stem assembly 2, the shut-off valve body 1 provides a stable mounting base and protective shell for the entire anti-leakage valve stem assembly 2. In use, the valve stem body 208 moves up and down through a threaded connection with the stem bracket 206, thereby driving the valve disc 204 to open or close, completing the flow control. The fixed plate 201 is embedded in the top of the shut-off valve body 1, providing a stable mounting carrier for the bellows sealing pipe 202 and the reinforced sealing sleeve 203, and also serving as an intermediate connection. The bellows sealing pipe 202 is connected between the fixed plate 201 and the valve disc 204. With the opening and closing of the valve stem body 208, it flexibly expands and contracts, always tightly fitting the valve stem body 208 and the valve disc 204, forming the first sealing barrier to prevent the medium from leaking from the connection between the valve stem body 208 and the valve disc 204. At the same time, the reinforced sealing sleeve 203 on the outer side of the bottom of the fixed plate 201... 3 is in close contact with the top side of the inside of the gate valve body 1 and is sleeved on the outside of the bellows sealing tube 202, forming a second sealing barrier, sealing the gap between the fixed plate 201 and the gate valve body 1. The double sealing structure greatly improves the overall sealing performance. The rod bracket 206 is welded to the top of the cover plate 205, which not only provides support and installation position for the valve stem body 208, but also the sealing and lubrication structure 207 on the bottom side of its inside can enhance the sealing between the valve stem body 208 and the rod bracket 206 when the valve stem body 208 moves, further blocking the leakage of the medium, and on the other hand, realize the continuous lubrication of the valve stem body 208, reduce the friction loss of the valve stem body 208 during the movement, and avoid the sealing surface from being damaged by friction. In the whole process, the components work together to ensure the normal opening and closing function of the gate valve, and effectively solve the problems of easy leakage and short service life of the existing valve stem, ensuring the stability of use and the continuity of production.

[0020] Specifically, such as Figure 4 As shown, the sealing and lubrication structure 207 includes a sealing and lubrication sleeve 2071 embedded in the bottom side of the rod holder 206, and the inner wall of the sealing and lubrication sleeve 2071 is tightly fitted with the outer wall of the valve stem body 208.

[0021] Specifically, such as Figure 4 As shown, a threaded oil injection hole 2072 is provided on the top of the front side of the sealing lubrication sleeve 2071, and a spiral oil groove 2073 is provided inside the sealing lubrication sleeve 2071.

[0022] Specifically, such as Figure 4 As shown, the spiral oil groove 2073 is filled with an oil-impregnated lubricating pad 2074, and the threaded oil injection hole 2072 is connected to a sealing bolt 2075 by a thread.

[0023] In this embodiment: By setting a sealing lubrication structure 207, a sealing lubrication sleeve 2071 is embedded in the bottom side of the rod holder 206. Its inner wall is tightly fitted with the outer wall of the valve stem body 208, forming a sealing barrier to prevent the medium from leaking from the gap between the valve stem body 208 and the rod holder 206. The threaded oil injection hole 2072 on the top front side of the sealing lubrication sleeve 2071 can inject lubricating medium. After injection, tightening the sealing bolt 2075 can prevent the lubricating medium from leaking and impurities from entering. The spiral oil groove 2073 inside the sealing lubrication sleeve 2071 can store the lubricating medium, and the spiral structure can make the lubricating medium evenly distributed on the surface of the valve stem body 208 as the valve stem body 208 rotates. At the same time, the oil-impregnated lubricating pad 2074 filled in the spiral oil groove 2073 can absorb and continuously release the lubricating medium, achieving long-term lubrication of the valve stem body 208, reducing frictional loss during the rotation of the valve stem body 208, and extending the service life of the sealing components and the valve stem body 208.

[0024] Specifically, such as Figure 3 , Figure 5 As shown, a stabilizing pad 3 is bonded to the top of the fixed plate 201, and the top of the stabilizing pad 3 contacts the bottom of the cover plate 205.

[0025] Specifically, such as Figure 3 As shown, a handwheel 4 is bolted to the top of the valve stem body 208, and an anti-slip sleeve is fitted on the outside of the handwheel 4.

[0026] In this embodiment: by setting a stabilizing pressure pad 3 and a handwheel 4, the stabilizing pressure pad 3, which is bonded to the top of the fixed plate 201, contacts the bottom of the cover plate 205, filling the tiny gap between the fixed plate 201 and the cover plate 205, enhancing the sealing of the connection between the two, and also playing a buffering role, avoiding wear caused by direct hard contact between the cover plate 205 and the fixed plate 201. It can also reduce the impact of vibration on the fixed plate 201 and subsequent sealing components when the valve is opened and closed, ensuring the stability of the seal. The handwheel 4 bolted to the top of the valve stem body 208 provides the operator with a convenient force application component. Turning the handwheel 4 can drive the valve stem body 208 to move up and down, realizing the opening and closing control of the valve. The anti-slip sleeve on the outside of the handwheel 4 can increase the friction between the hand and the handwheel 4, avoiding slippage during operation, making the opening and closing operation more effortless and stable, and improving the safety and convenience of operation.

[0027] Specifically, such as Figure 3 As shown, a fixing block 5 is fixedly connected in the middle inside the rod frame 206, and the inner hole of the fixing block 5 is rotatably engaged with the valve stem body 208.

[0028] Specifically, such as Figure 3 , Figure 4 As shown, the outer side of the valve stem body 208 is coated with a wear-resistant coating.

[0029] In this embodiment: by fixing the middle of the rod frame 206 with a fixed positioning block 5, which rotates with the valve stem body 208, the fixed positioning block 5 can center and support the valve stem body 208, preventing the valve stem body 208 from shifting or shaking during movement. This ensures the precise fit between the valve stem body 208 and the sealing components and valve disc 204, reducing sealing gaps and wear caused by shifting. The wear-resistant coating sprayed on the outside of the valve stem body 208 can enhance the surface hardness and wear resistance of the valve stem body 208, effectively resisting media corrosion and friction damage between the valve stem body 208 and the sealing components and the fixed positioning block 5, preventing scratches on the surface of the valve stem body 208. Combined with the lubrication of the sealing and lubrication structure 207, this further reduces the wear rate, extends the service life of the valve stem body 208, and ensures the integrity of the sealing surface, improving the overall leak-proof performance.

[0030] Working Principle: In the operation of a gate valve with an anti-leakage structure, the operator first rotates the handwheel 4 bolted to the top of the valve stem body 208. The anti-slip sleeve on the outside of the handwheel 4 increases hand friction, preventing slippage and making force application easier and more stable. The rotation of the handwheel 4 drives the valve stem body 208 to move up and down along the threaded structure of the rod holder 206, thereby opening or closing the valve disc 204 to control the flow of fluid. During the movement of the valve stem body 208, the fixing block 5 in the middle of the rod holder 206 plays a crucial role. It rotates in conjunction with the valve stem body 208, providing centering and support to prevent displacement or wobbling, ensuring the valve stem body remains stable. The precise alignment of valve stem 208 with the seal and valve disc 204, along with the wear-resistant coating applied to the outer side of valve stem 208, enhances surface hardness and wear resistance, effectively resisting media corrosion and frictional damage with the seal and fixing block 5, preventing scratches on the surface of valve stem 208. Simultaneously, the sealing and lubrication structure 207 on the bottom side of the stem bracket 206 functions, with the embedded sealing and lubrication sleeve 2071 tightly fitting against the outer wall of valve stem 208, forming a sealing barrier to prevent media leakage from the gap. If additional lubrication is needed, the sealing bolt 2075 in the threaded oil injection hole 2072 can be unscrewed, lubricating media injected, and then the sealing bolt 2075 tightened to prevent lubricating media leakage and impurities from entering, ensuring a tight seal. The spiral oil groove 2073 inside the lubrication sleeve 2071 can store the lubricating medium, and with the rotation of the valve stem body 208, the lubricating medium is evenly distributed on the surface of the valve stem body 208. The oil-impregnated lubricating pad 2074 inside the spiral oil groove 2073 can also absorb and continuously release the lubricating medium, achieving long-term lubrication and reducing frictional loss during the movement of the valve stem body 208. The fixed plate 201 is embedded in the top of the stop valve body 1, and the stabilizing pressure pad 3 bonded to its top contacts the bottom of the cover plate 205, filling the tiny gap between them, enhancing the connection sealing, and also playing a buffering role to avoid hard contact wear and reduce the impact of valve opening and closing vibration on the seal. The corrugated sealing tube 202 at the bottom of the fixed plate 201 is connected to the valve disc 204, and will rotate with the valve stem body 208. The valve stem body 208 can flexibly expand and contract during opening and closing, always closely fitting the valve stem body 208 and valve disc 204 to form the first sealing barrier. Meanwhile, the reinforced sealing sleeve 203 on the outer side of the bottom of the fixed plate 201 is fitted onto the outer side of the bellows sealing tube 202 and is in close contact with the top side inside the stop valve body 1, sealing the gap between the fixed plate 201 and the stop valve body 1 to form the second sealing barrier. Throughout the entire use process, the various components of the stop valve body 1 and the anti-leakage valve stem assembly 2 work together, and through the combined effects of double sealing, precise positioning, long-term lubrication and wear-resistant protection, they not only ensure the normal opening and closing function of the stop valve, but also effectively solve the problems of easy leakage and short life of existing valve stems, ensuring the stability of use and the continuity of production.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements 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 stop valve stem with a leak-proof structure, comprising a stop valve body (1), characterized in that: The inside of the shut-off valve body (1) is provided with a leak-proof valve stem assembly (2); The anti-leakage valve stem assembly (2) includes a fixed plate (201), which is embedded in the top of the shut-off valve body (1). A bellows sealing tube (202) is fixedly connected to the bottom of the fixed plate (201). A reinforcing sealing sleeve (203) is fixedly connected to the outer side of the bottom of the fixed plate (201). The bottom of the reinforcing sealing sleeve (203) contacts the top side inside the shut-off valve body (1). The reinforcing sealing sleeve (203) is located outside the bellows sealing tube (202). A valve disc is fixedly connected to the bottom of the bellows sealing tube (202). 204), the top of the shut-off valve body (1) is bolted with a cover plate (205), the top of the cover plate (205) is welded with a rod frame (206), the bottom side of the rod frame (206) is provided with a sealing and lubrication structure (207), the top of the rod frame (206) is threadedly connected to a valve stem body (208), the bottom of the valve stem body (208) passes through the interior of the sealing and lubrication structure (207), the fixed plate (201) and the corrugated sealing tube (202) in sequence, and the bottom of the valve stem body (208) is fixedly connected to the top of the valve disc (204).

2. The valve stem of a gate valve with an anti-leakage structure according to claim 1, characterized in that: The sealing and lubrication structure (207) includes a sealing and lubrication sleeve (2071) embedded in the bottom side of the rod frame (206), and the inner wall of the sealing and lubrication sleeve (2071) is tightly fitted with the outer wall of the valve stem body (208).

3. The valve stem of a gate valve with an anti-leakage structure according to claim 2, characterized in that: The sealing lubrication sleeve (2071) has a threaded oil injection hole (2072) on the top of the front side, and a spiral oil groove (2073) is provided inside the sealing lubrication sleeve (2071).

4. The valve stem of a gate valve with an anti-leakage structure according to claim 3, characterized in that: The spiral oil groove (2073) is filled with an oil-impregnated lubricating pad (2074), and the threaded oil injection hole (2072) is threaded with a sealing bolt (2075).

5. The valve stem of a gate valve with an anti-leakage structure according to claim 1, characterized in that: The top of the fixed plate (201) is bonded with a stabilizing pad (3), and the top of the stabilizing pad (3) is in contact with the bottom of the cover plate (205).

6. The valve stem of a gate valve with an anti-leakage structure according to claim 1, characterized in that: A handwheel (4) is bolted to the top of the valve stem body (208), and an anti-slip sleeve is fitted on the outside of the handwheel (4).

7. The valve stem of a gate valve with an anti-leakage structure according to claim 1, characterized in that: A fixing block (5) is fixedly connected in the middle inside the rod frame (206), and the inner hole of the fixing block (5) is rotatably engaged with the valve stem body (208).

8. The valve stem of a gate valve with an anti-leakage structure according to claim 1, characterized in that: The outer side of the valve stem body (208) is coated with a wear-resistant coating.

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