A sealing connection structure of a valve stem and a valve seat

Abstract

The utility model relates to valve technical field, concretely is a kind of sealing connection structure of valve stem and valve seat, including valve body, the inside of valve body is equipped with valve seat, the top of valve body is equipped with valve cover, the top of valve cover is equipped with sealing seat in cooperation, the top of sealing seat is equipped with valve stem, the bottom of valve stem is equipped with first sealing valve core, the bottom of first sealing valve core is fixedly installed with connecting rod, and the side surface of connecting rod is equipped with second sealing valve core, and the top of second sealing valve core is equipped with sealing sleeve ring;Beneficial effects are: through sealing sleeve ring, first sealing valve core, second sealing valve core and valve seat structure design, form multiple sealing layers, greatly improve the sealing property of valve, through the air ring design in sealing sleeve ring, not only effectively cope with pressure variation, guarantee the sealing effect of valve core and valve seat, and avoid the contact surface to be washed by medium, sealing surface is prone to damage, leading to the shortcoming of the decline of sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a sealing connection structure between a valve stem and a valve seat. Background Technology

[0002] The valve seat is a key component in industrial valves that supports the valve core in the fully closed position. It forms a sealing pair with the valve core to achieve the function of fluid cut-off. The valve stem, as the driving component that drives the valve core, directly determines the sealing performance of the valve. Therefore, the sealing connection structure between the valve stem and the valve seat is crucial. However, during long-term use, due to the erosion of the medium and the relative wear between the valve core and the valve seat, the sealing surface is prone to damage, which will lead to a decrease in sealing performance. Utility Model Content

[0003] The purpose of this utility model is to provide a sealing connection structure between the valve stem and the valve seat to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a sealing connection structure for a valve stem and a valve seat, comprising a valve body, a valve seat installed inside the valve body, a valve cover installed on the top of the valve body, a sealing seat fitted on the top of the valve cover, a valve stem installed on the top of the sealing seat, and the bottom of the valve stem extending into the interior of the valve body, a first sealing valve core installed on the bottom of the valve stem, a connecting rod fixedly installed on the bottom of the first sealing valve core, and a second sealing valve core sleeved on the side of the connecting rod, a sealing ring installed on the top of the second sealing valve core, and the top of the sealing ring in close contact with the bottom of the first sealing valve core, a second trapezoidal surface opened on the side of the valve seat, and a slot opened on the top of the second trapezoidal surface, the slot being inserted into the sealing ring.

[0005] Preferably, the slot has a first trapezoidal surface on its side, which slides in contact with the bottom of the first sealing valve core, and the second trapezoidal surface slides in contact with the bottom of the second sealing valve core.

[0006] Preferably, a sealing gasket is installed on the top of the second trapezoidal surface. The sealing gasket is in close contact with the second sealing valve core, and the top and side of the sealing gasket are in close contact with the bottom and side of the sealing sleeve. The sealing gasket and the sealing sleeve are fitted together to form multiple sealing layers.

[0007] Preferably, the bottom of the valve seat has a threaded texture, and the valve seat is fixedly connected to the valve body through the threaded texture.

[0008] Preferably, a through hole is provided on the side of the second trapezoidal surface, a piston is slidably disposed on the inner side of the through hole, and a top post is fixedly installed on the top of the piston. The top of the top post is in contact with the bottom of the sealing gasket. The top post is subjected to the pressure of the medium inside the valve body, which pushes the sealing gasket, making the structure of the sealing layer fit more tightly.

[0009] Preferably, the top of the second sealing valve core is provided with a limiting groove, and the limiting groove is slidably connected to the connecting rod. Both the sealing sleeve and the sealing gasket are provided with air rings inside. The air ring design effectively meets the sealing requirements under variable pressure conditions.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: Through the structural design of the sealing ring, the first sealing valve core, the second sealing valve core, and the valve seat, the valve seat is equipped with a slot that engages with the sealing ring. Simultaneously, the valve stem pushes the first and second sealing valve cores to fully compress the sealing ring, thereby forming multiple sealing layers. This effectively prevents media leakage and greatly improves the valve's sealing performance. Furthermore, the second trapezoidal surface adopts a water pressure sealing structure, using water pressure to push the sealing gasket, making the structure at the sealing layer fit more tightly. The air ring inside the sealing ring utilizes the compressibility of air, which not only effectively meets the sealing requirements under variable pressure conditions but also avoids the disadvantages of traditional contact surfaces being eroded by the media, causing damage to the sealing surface and resulting in a decrease in sealing performance. Both the sealing gasket and the sealing ring are detachable. When the sealing components are worn or damaged, the sealing ring can be replaced simply by disassembling the valve seat and valve stem, reducing maintenance costs and time. Attached Figure Description Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cross-section of the structure of this utility model; Figure 3 This is a schematic diagram of the sealing structure of this utility model. Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0011] In the diagram: 1. Valve body; 2. Valve seat; 3. Valve cover; 4. Sealing seat; 5. Valve stem; 6. First sealing valve core; 7. Connecting rod; 8. Second sealing valve core; 9. Sealing ring; 10. Second trapezoidal surface; 11. Slot; 12. First trapezoidal surface; 13. Sealing gasket; 14. Thread texture; 15. Through hole; 16. Piston; 17. Top column; 18. Restricting groove; 19. Gas ring. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0013] Example 1: Please refer to Figures 1-4 This utility model provides a technical solution: a sealing connection structure for a valve stem and a valve seat, including a valve body 1, a valve seat 2 installed inside the valve body 1, a valve cover 3 installed on the top of the valve body 1, a sealing seat 4 fitted on the top of the valve cover 3, a valve stem 5 installed on the top of the sealing seat 4, and the bottom of the valve stem 5 extending into the interior of the valve body 1, a first sealing valve core 6 installed on the bottom of the valve stem 5, a connecting rod 7 fixedly installed on the bottom of the first sealing valve core 6, a second sealing valve core 8 sleeved on the side of the connecting rod 7, a sealing ring 9 installed on the top of the second sealing valve core 8, and the top of the sealing ring 9 in close contact with the bottom of the first sealing valve core 6.

[0014] The valve seat 2 has a second trapezoidal surface 10 on its side, and a slot 11 on the top of the second trapezoidal surface 10. The slot 11 is inserted into the sealing ring 9. The slot 11 has a first trapezoidal surface 12 on its side. The first trapezoidal surface 12 slides in contact with the bottom of the first sealing valve core 6, and the second trapezoidal surface 10 slides in contact with the bottom of the second sealing valve core 8. A sealing gasket 13 is installed on the top of the second trapezoidal surface 10. The sealing gasket 13 is in close contact with the second sealing valve core 8, and the top and side of the sealing gasket 13 are in close contact with the bottom and side of the sealing ring 9. The valve stem 5 pushes the first sealing valve core 6 and the second sealing valve core 8 to contact the first and second surfaces, and the sealing ring 9 is inserted into the slot 11 to form a first sealing structure. The sealing ring 9 and the sealing gasket 13 are located between the first sealing valve core 6 and the second trapezoidal surface 10 to form a second sealing structure. The sealing gasket 13 is fully pushed by the second sealing valve core 8, which will compress the sealing ring 9, thereby forming a third sealing structure.

[0015] The bottom of the valve seat 2 is provided with a threaded texture 14, and the valve seat 2 is fixedly connected to the valve body 1 through the threaded texture 14.

[0016] The second trapezoidal surface 10 has a through hole 15 on its side. A piston 16 is slidably disposed inside the through hole 15, and a top post 17 is fixedly installed on the top of the piston 16. The top of the top post 17 is in contact with the bottom of the sealing gasket 13. The through hole 15 is connected to the medium inside the valve body. When the top post 17 is subjected to the pressure of the medium inside the valve body 1, it will push the sealing gasket 13, making the structure of the sealing layer fit more tightly.

[0017] The top of the second sealing valve core 8 is provided with a limiting groove 18, and the limiting groove 18 is slidably connected to the connecting rod 7. Both the sealing sleeve 9 and the sealing gasket 13 are provided with air rings 19. The air rings 19 in the sealing rings utilize the compressibility of air to automatically adjust the sealing pressure when the medium pressure fluctuates. When the pressure increases, the air rings 19 contract to generate a reverse thrust, which enhances the sealing fit. When the pressure decreases, the air rings 19 expand to keep the sealing ring in contact with the sealing surface, effectively meeting the sealing requirements under variable pressure conditions.

[0018] In use, firstly, the valve seat 2 is fixedly installed to the valve body 1 via the threaded texture 14. Then, the valve cover 3, sealing seat 4, and valve stem 5 are installed on the valve body 1. During the closing process between the valve stem 5 and the valve seat 2, the valve stem 5 pushes the first sealing valve core 6 and the second sealing valve core 8 into contact with the first trapezoidal surface 12 and the second trapezoidal surface 10. The second sealing valve core 8 will slide relative to the first sealing valve core 6 on the side of the connecting rod 7, securing the sealing ring 9 between the first sealing valve core 6 and the second sealing valve core 8. During contact, the sealing ring 9 is inserted into the slot 11, forming the first sealing structure. The sealing ring 9 and the sealing gasket... 13 is located between the first sealing valve core 6 and the second trapezoidal surface 10, and is pressed and contacted to form a second sealing structure. The sealing gasket 13 is fully pushed by the second sealing valve core 8. When the gasket 19 contracts, it generates a reverse thrust, which compresses the sealing ring 9, thereby forming a third sealing structure. Multiple sealing layers complete the valve closure, effectively preventing medium leakage and greatly improving the valve's sealing performance. Furthermore, when the valve stem 5 and valve seat 2 are closed, the top column 17 is subjected to the pressure of the medium inside the valve body 1. The top column 17 slides in the through hole 15 and pushes the sealing gasket 13, making the structure of the sealing layer fit more tightly.

[0019] 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 sealing connection structure between a valve stem and a valve seat, characterized in that: The valve includes a valve body (1), a valve seat (2) is installed inside the valve body (1), a valve cover (3) is installed on the top of the valve body (1), a sealing seat (4) is provided on the top of the valve cover (3), a valve stem (5) is installed on the top of the sealing seat (4), and the bottom of the valve stem (5) extends into the interior of the valve body (1). A first sealing valve core (6) is installed on the bottom of the valve stem (5), a connecting rod (7) is fixedly installed on the bottom of the first sealing valve core (6), and a second sealing valve core (8) is sleeved on the side of the connecting rod (7). A sealing ring (9) is installed on the top of the second sealing valve core (8), and the top of the sealing ring (9) is in close contact with the bottom of the first sealing valve core (6). A second trapezoidal surface (10) is opened on the side of the valve seat (2), and a slot (11) is opened on the top of the second trapezoidal surface (10). The slot (11) is inserted into the sealing ring (9).

2. The sealing connection structure between the valve stem and the valve seat according to claim 1, characterized in that: The slot (11) has a first trapezoidal surface (12) on its side. The first trapezoidal surface (12) slides in contact with the bottom of the first sealing valve core (6), and the second trapezoidal surface (10) slides in contact with the bottom of the second sealing valve core (8).

3. The sealing connection structure between the valve stem and the valve seat according to claim 2, characterized in that: A sealing gasket (13) is installed on the top of the second step surface (10). The sealing gasket (13) is in close contact with the second sealing valve core (8), and the top and side of the sealing gasket (13) are in close contact with the bottom and side of the sealing ring (9).

4. The sealing connection structure between the valve stem and the valve seat according to claim 3, characterized in that: The bottom of the valve seat (2) is provided with a threaded texture (14), and the valve seat (2) is fixedly connected to the valve body (1) through the threaded texture (14).

5. The sealing connection structure between the valve stem and the valve seat according to claim 4, characterized in that: The second trapezoidal surface (10) has a through hole (15) on its side. A piston (16) is slidably disposed inside the through hole (15), and a top post (17) is fixedly installed on the top of the piston (16). The top of the top post (17) is in contact with the bottom of the sealing gasket (13).

6. The sealing connection structure between the valve stem and the valve seat according to claim 5, characterized in that: The second sealing valve core (8) has a limiting groove (18) on its top, and the limiting groove (18) is slidably connected to the connecting rod (7). Both the sealing sleeve (9) and the sealing gasket (13) are provided with air rings (19).

Images