Non-rising stem type soft sealing gate valve

Abstract

According to the technical scheme, the non-rising stem type soft sealing gate valve is characterized in that the non-rising stem type soft sealing gate valve comprises a valve body, a valve plate located in the valve body, a valve rod driving the valve plate to move up and down and a rubber layer wrapping the valve plate, and the valve body comprises a flow channel with the axis parallel to the horizontal plane and a plate containing chamber located above the flow channel; the valve plate comprises a side portion capable of abutting against the inner wall of the plate containing chamber and an edge portion capable of abutting against the inner wall of the flow channel, the rubber layer comprises a thin portion wrapping the side portion and a thick portion located outside the edge portion and capable of being attached to the inner wall of the flow channel, a plurality of springs are arranged in the thick portion, the springs are distributed along the edge contour of the valve plate, and the two ends of each spring face the edge portion and the inner wall of the flow channel respectively. The thick part is propped open through the spring so that the thick part can be fully attached to the inner wall of the flow channel, and the problem that leakage is prone to occurring in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, and more specifically to a concealed-stem soft-sealed gate valve. Background Art

[0002] The concealed stem soft-sealed gate valve is widely used in pipelines in the petroleum, chemical, pharmaceutical, metallurgical, coal, electric power, urban water supply and drainage industries to control the flow and cutoff of pipeline media. It is one of the most widely used valves in various fluid transportation projects. The existing concealed stem soft-sealed gate valve includes a valve body, a valve plate located in the valve body, a valve stem that drives the valve plate to move up and down, and a rubber layer wrapped around the valve plate. The soft rubber layer is prone to elastic failure and shrinkage in different media or environments. This will cause the valve plate to partially or completely fail to fully fit with the inner wall of the flow channel when the edge of the valve plate near the valve body opening fits with the inner wall of the valve body, or the valve plate and the inner wall of the flow channel are fully fit. The edge of the valve plate near the valve body opening cannot fit with the inner wall of the valve body, thereby failing to achieve the requirement of sealing at multiple locations at the same time, resulting in the gate valve being unable to be completely closed and leaking. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a concealed-stem soft-sealed gate valve with stable sealing and wide application range.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a concealed-stem soft-sealed gate valve, comprising a valve body, a valve plate located in the valve body, a valve stem that drives the valve plate to move up and down, and a rubber layer wrapped around the outside of the valve plate, the valve body comprising a flow channel whose axis is parallel to the horizontal plane and a container plate chamber located above the flow channel, the valve plate comprising a side portion that can touch the inner wall of the container plate chamber and an edge portion that touches the inner wall of the flow channel, the rubber layer comprising a thin portion wrapped around the outside of the side portion and a thick portion positioned outside the edge portion and able to fit with the inner wall of the flow channel, a plurality of springs distributed along the edge contour of the valve plate and with two ends facing the edge portion and the inner wall of the flow channel respectively are arranged in the thick portion, the thick portion is stretched open by the spring so that the thick portion can fully fit with the inner wall of the flow channel.

[0005] As a further improvement of the utility model, the thick portion is provided with a pressure groove which is away from the side where the valve stem is located and can allow the medium to flow in, and the pressure groove and the spring do not interfere with each other.

[0006] As a further improvement of the utility model, the edge portion is provided with rib rods which can correspond to a plurality of springs one by one and be inserted into the inner cavity of the springs.

[0007] As a further improvement of the utility model, the upper surface of the side portion is inclined relative to the horizontal plane and the height of the inner edge adjacent to the valve stem is greater than the height of the outer edge adjacent to the inner wall of the container plate chamber.

[0008] The beneficial effects of the utility model are as follows: the rubber layer includes a thick portion that fits with the inner wall of the flow channel and a thin portion that fits with the inner wall of the container plate chamber. A spring is arranged in the thick portion, and the thick portion is stretched open by the spring so that the thick portion can fully fit with the inner wall of the flow channel. Compared with the prior art, such a design can enhance the structural strength of the thick portion and maintain the elasticity of the thick portion by the spring, which not only extends the service life of the thick portion, but also ensures the sealing. At the same time, the spring can reduce the impact force between the valve plate and the flow channel. Furthermore, the deformation of the spring can provide an effective stroke for the sealing between the side portion and the container plate chamber and the sealing degree, thereby ensuring that the valve plate can effectively block the flow of the medium and avoid leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the front view of the utility model;

[0010] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0011] Figure numerals: 1, valve body; 11, flow channel; 12, plate chamber; 2, valve plate; 21, side; 22, edge; 23, rib rod; 3, valve stem; 4, rubber layer; 41, thin part; 42, thick part; 43, spring; 44, pressure groove. DETAILED DESCRIPTION

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are indicated by the same reference numerals.

[0013] Reference Figure 1 and Figure 2 As shown, a concealed stem type soft-sealed gate valve of this embodiment includes a valve body 1, a valve plate 2 located in the valve body 1, a valve stem 3 driving the valve plate 2 to move up and down, and a rubber layer 4 wrapped around the valve plate 2. The valve body 1 includes a flow channel 11 whose axis is parallel to the horizontal plane and a plate chamber 12 located above the flow channel 11. The valve plate 2 includes a side portion 21 that can contact the inner wall of the plate chamber 12 and an edge portion 22 that contacts the inner wall of the flow channel 11.

[0014] Based on the above-mentioned prior art, the rubber layer 4 includes a thin portion 41 and a thick portion 42. The spring 43 can be placed in the mold and the rubber can be injected so that the spring 43 is built into the thick portion 42 after the rubber is formed, or a blind hole for the spring 43 to be installed is opened in the thick portion 42 so that the spring 43 can be installed in the thick portion 42. A plurality of springs 43 are distributed along the length direction of the thick portion 42. In the process of wrapping the rubber layer 4 around the outside of the valve plate 2, the thick portion 42 is attached to the outside of the surface where the edge 22 can be attached to the inner wall of the flow channel 11, and then the thin portions 41 connected on both sides of the thick portion 42 are wrapped around the two side surfaces of the valve plate 2 and the outside of the side portion 21 in turn. Finally, the ends of the thin portion 41 are fixedly connected to the outside of the valve plate 2. The springs 43 located in the thick portion 42 are distributed along the edge contour of the valve plate 2, and the two ends of the springs 43 are respectively facing the edge 22 and the inner wall of the flow channel 11.

[0015] In the initial state, the medium in the valve body 1 is in a circulation state, the valve plate 2 is located in the container plate chamber 12, and the thick portion 42 is in a stretched state under the action of the spring 43; in the process of the valve stem 3 driving the valve plate 2 to move into the flow channel 11 and form a soft seal with the flow channel 11, the thick portion 42 contacts the inner wall of the flow channel 11 first compared with the thin portion 41 wrapped outside the side portion 21, and as the valve stem 3 continues to move downward, the thick portion 42 is compressed, and the spring 43 is shortened accordingly, until the thin portion 41 outside the side portion 21 fits with the inner wall of the container plate chamber 12 to form a soft seal and the medium can no longer flow, the valve stem 3 stops moving, and an effective soft seal is formed between the valve plate 2 and the valve body 1; in the process of the valve stem 3 driving the valve plate 2 to move upward, the thin portion 41 outside the side portion 21 is first separated from the inner wall of the container plate chamber 12, and then the spring 43 gradually recovers its deformation, and then the thick portion 42 is separated from the inner wall of the flow channel 11, until the valve plate 2 returns to the container plate chamber 12, and the valve stem 3 stops moving;

[0016] Compared with the prior art, such a design can enhance the structural strength of the thick portion 42 and maintain the elasticity of the thick portion 42 through the spring 43, which not only prolongs the service life of the thick portion 42, but also ensures the sealing. At the same time, the spring 43 can reduce the impact force between the valve plate 2 and the flow channel 11. Moreover, the deformation of the spring 43 can provide an effective stroke for the sealing and sealing degree between the side portion 21 and the container chamber 12, ensuring that the valve plate 2 can effectively block the flow of the medium and avoid leakage of the medium.

[0017] As a specific implementation of the improvement, the bending degree of the spring 43 in the thick portion 42 increases with the increase of the width of the thick portion 42, which affects the efficiency of the elastic deformation of the spring 43. At the same time, the contact area between the thick portion 42 and the flow channel 11 is large, which causes the adhesion between the thick portion 42 and the flow channel 11 to increase, and increases the torque required for the valve stem 3 to drive the valve plate 2 to move, which not only reduces the opening efficiency of the valve plate 2, but also makes the thick portion 42 easily damaged due to pulling. In order to solve the above-mentioned problems, refer to Figure 2As shown, a pressure groove 44 is provided in the thick portion 42 away from the side where the valve stem 3 is located and into which the medium can flow. The pressure groove 44 and the spring 43 do not interfere with each other. Such a design can reduce the width of the thick portion 42 where the spring 43 is located, thereby ensuring that the spring 43 remains in a straight state and improving the efficiency of the elastic deformation of the spring 43. At the same time, the contact area between the thick portion 42 and the inner wall of the flow channel 11 is reduced, thereby reducing the adhesion between the thick portion 42 and the inner wall of the flow channel 11, ensuring the smoothness of the opening of the valve plate 2 and indirectly improving the structural stability of the thick portion 42; when the thick portion 42 forms a soft seal with the flow channel 11, the medium will enter the pressure groove 44 and apply a thrust to one side of the thick portion 42, thereby further causing the thick portion 42 to deform, improving the close contact between the thick portion 42 and the flow channel 11, and improving the soft sealing effect.

[0018] As a specific implementation method of the improvement, refer to Figure 2 As shown, a rib rod 23 is provided on the edge portion 22, which can correspond to multiple springs 43 one by one and be inserted into the inner cavity of the spring 43. The length of the rib rod 23 is less than the length of the spring 43. Before the thick portion 42 is close to the edge portion 22, the rib rod 23 is inserted into the corresponding inner cavity of the spring 43. Such a design can provide positioning for the thick portion 42 when it is partially fitted into place, avoid the thick portion 42 sliding relative to the edge portion 22 and reduce the installation efficiency of the thick portion 42, and facilitate the subsequent operation of wrapping the thin portion 41 outside the valve plate 2. At the same time, the rib rod 23 provides a certain structural strength for the spring 43, reduces the degree of bending of the spring 43 along with the thick portion 42, thereby ensuring that the spring 43 can maintain or tend to be straight and can be effectively deformed.

[0019] As a specific implementation method of the improvement, refer to Figure 1 As shown, the upper surface of the side portion 21 is inclined relative to the horizontal plane and the height of the inner edge adjacent to the valve stem 3 is greater than the height of the outer edge adjacent to the inner wall of the container chamber 12. Compared with the design in which the upper surface of the side portion 21 is made into a horizontal plane, such a design can guide the medium and impurities in the medium to the edge of the side portion 21 and drop them, thereby avoiding the phenomenon of impurities accumulating above the side portion 21. The overall mass of the valve plate 2 remains constant, making it easier for the valve stem 3 to drive the valve plate 2.

[0020] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A concealed stem type soft-sealed gate valve, comprising a valve body (1), a valve plate (2) located in the valve body (1), a valve stem (3) driving the valve plate (2) to move up and down, and a rubber layer (4) wrapped around the valve plate (2), wherein the valve body (1) comprises a flow channel (11) whose axis is parallel to a horizontal plane and a plate chamber (12) located above the flow channel (11), and the valve plate (2) comprises a side portion (21) capable of contacting an inner wall of the plate chamber (12) and an edge portion (22) contacting an inner wall of the flow channel (11), characterized in that: The rubber layer (4) includes a thin portion (41) wrapped around the side portion (21) and a thick portion (42) positioned outside the edge portion (22) and capable of fitting with the inner wall of the flow channel (11). The thick portion (42) is provided with a plurality of springs (43) distributed along the edge contour of the valve plate (2) and with two ends facing the edge portion (22) and the inner wall of the flow channel (11) respectively. The thick portion (42) is stretched open by the springs (43) so that the thick portion (42) can fully fit with the inner wall of the flow channel (11).

2. A concealed stem soft-sealed gate valve according to claim 1, characterized in that: The thick portion (42) is provided with a pressure groove (44) which is away from the side where the valve stem (3) is located and can allow the medium to flow in, and the pressure groove (44) and the spring (43) do not interfere with each other.

3. A concealed stem soft-sealed gate valve according to claim 1 or 2, characterized in that: The edge portion (22) is provided with rib rods (23) which can correspond to a plurality of springs (43) one by one and be inserted into the inner cavity of the springs (43).

4. A concealed stem soft-sealed gate valve according to claim 1 or 2, characterized in that: The upper surface of the side portion (21) is arranged to be inclined relative to the horizontal plane, and the height of the inner edge adjacent to the valve stem (3) is greater than the height of the outer edge adjacent to the inner wall of the container plate chamber (12).

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