Elastic sealing gate valve capable of overcoming cantilever and preventing displacement

Abstract

The utility model discloses a cantilever overcoming anti-displacement elastic sealing gate valve, which comprises a valve body, guide grooves arranged on the inner walls of the two sides of the valve body and a gate plate in sliding fit with the guide grooves, and the guide grooves are provided with extension parts which extend downwards and are at least partially contacted with the lower ends of the two sides of the gate plate. The utility model has the beneficial effects that the downward extending part of the guide groove is used for supporting the flashboard, the design of the conventional suspension type flashboard is changed, the contact area between the guide groove and the flashboard is greatly increased, the sealing performance is improved, and when the axial medium pressure is greater than the friction force, the flashboard is not only subjected to downward pressure, but also is not influenced. Meanwhile, transverse blocking force is provided for the gate plate by the extending part, equivalently, sealing in two aspects is added, and displacement or swing cannot be generated; the hanging lugs on the two sides of the gate plate and the guide grooves in the valve body do not form pressure shearing any more, and therefore the service life of the gate valve is prolonged by times.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to an elastic sealing gate valve. Background Art

[0002] The opening and closing part of the gate valve is the valve plate. The movement direction of the valve plate is perpendicular to the flow direction of the medium. The gate valve is generally used for full opening and full closing, and is rarely adjusted and throttled. The valve plate has two sealing surfaces. The most commonly used mode is that the two sealing surfaces of the valve plate are wedge-shaped. The wedge angle varies with the valve parameters and is usually 5°. The valve plate of the wedge-type gate valve can be made into an integral body, and can be made into a valve plate that can produce a slight deformation. Different types of rubber are covered on the valve plate casting to improve its processability. This valve plate is called an elastic valve plate (or rubber valve plate), and this type of gate valve is called an elastic sealing gate valve. There is no groove in the valve body channel of the elastic sealing gate valve. It is a straight-through structure, and the medium flows smoothly. The compression force generated by the torsion applied to the valve plate by the valve stem makes the valve plate pressed against the wall of the valve body channel, and the compensation effect of the slight elastic deformation of the elastic valve plate is used to achieve a good sealing effect. Since the valve body channel of the elastic sealing gate valve is a straight-through structure, there is no lateral support at the bottom of the valve plate of the elastic sealing gate valve, so that the valve plate forms a hanging structure. The valve stem and the valve stem nut apply torque to the valve plate to generate a pressing force, so that the valve plate is pressed against the valve body channel. The sealing performance is achieved entirely by converting the radial pressing force into friction to offset the axial medium pressure. When the axial medium pressure is less than or equal to the friction force, the bottom of the valve plate will be vertically pressed against the valve body channel to achieve sealing; when the axial medium pressure is greater than the friction force, the valve plate will be displaced and will have a certain inclination with the valve body channel. When the displacement exceeds the compensation amount of the elastic valve plate to produce a slight elastic deformation, the sealing performance of the gate valve will be affected. At the same time, during the processing and assembly of the gate valve, due to reasons such as processing accuracy and operating proficiency, it will also cause the valve plate and the valve body channel to be difficult to be in a vertical state, and sometimes there will be a certain offset, at which time the sealing performance of the gate valve will also be affected. When the gate valve is small, sealing can be achieved by increasing the torque, but the result is that the gate valve torque increases; when the gate valve diameter exceeds DN300, the above method is difficult to ensure the sealing performance of the gate valve. Therefore, when the gate valve is under high pressure, the conventional elastic sealing gate valve will cause the valve plate to displace laterally due to the pressure difference on both sides of the channel. At the same time, since the middle of both sides of the gate plate are suspended in the guide groove of the inner wall of the valve body through the hanging ears, shear force will be generated between the gate plate and the valve body when impacted by the axial medium, which will damage the gate plate and thus affect the service life of the gate valve. Under high pressure, the suspended gate plate will swing or displace. Once the lower part of the gate plate begins to swing or displace, the upper part of the gate plate will leak and the seal will be damaged.

[0003] For example, China Utility Model Patent Publication No. CN219809422U discloses a leak-proof gate valve, including a valve body, both sides of which are fixedly connected to a butt-joint pipe, the top of the valve body is fixedly connected to a butt-joint piece, a threaded column is threadedly connected to the butt-joint piece, one end of the threaded column extends to the inside of the valve body and is provided with a mounting plate, the bottom of the mounting plate is fixedly connected to a gate, the top of the threaded column is fixedly connected to a rotating handle, and both sides of the inner wall of the valve body are fixedly connected to guide grooves. In this patent, the gate is still a suspended structure, and there is still the problem of displacement of the valve plate when the axial medium pressure is greater than the friction force.

[0004] Another example is China Invention Patent Publication No. CN107461509A, which discloses a high-reliability elastic soft-sealed gate valve, including a handwheel, a valve stem, a valve cover, a valve body and a valve plate. The two ends of the valve body channel are respectively the medium inlet and outlet. The valve cover is mounted on the valve body. The bottom of the valve stem passes through the valve cover and is connected to the valve plate, and the top is connected to the handwheel. A slightly convex arc surface is provided on the bottom wall of the valve body channel below the valve plate. A concave hole for inserting the slightly convex arc surface is provided on the bottom surface of the valve plate. The height of the slightly convex arc surface is 2 to 6 mm. The bottom walls of the medium inlet and outlet are both provided with an arc-shaped conical surface, and the small end of the arc-shaped conical surface faces outward, with an inclination angle α of 3° to 8°, preferably 5°. This patent relies on the cooperation of the slightly convex arc surface and the concave hole to provide additional support for the valve plate. Due to the limited contact area between the arc surface and the concave hole, the problem of valve plate displacement cannot be fundamentally solved. Utility Model Content

[0005] The technical problem to be solved by the utility model is that when the axial medium pressure of the existing elastic sealing gate valve is greater than the friction force, the valve plate will be displaced, and an elastic sealing gate valve that overcomes the cantilever anti-displacement is provided.

[0006] The technical solution of the utility model is to overcome the cantilever anti-displacement elastic sealing gate valve, including: a valve body, guide grooves arranged on the inner walls on both sides of the valve body and a gate plate slidably matched with the guide grooves, wherein the guide grooves have extension parts extending downward and at least partially contacting the lower ends of both sides of the gate plate.

[0007] In the above solution, the lower ends of both sides of the gate plate have matching surfaces that conformally match the extension part.

[0008] The two sealing surfaces of the gate in the above scheme are wedge-shaped, and the wedge angle is 6°-8°.

[0009] The improvement of the above scheme is that the two ends of the valve body are respectively a medium inlet and a medium outlet, and the bottom walls of the medium inlet and the medium outlet are both provided with an arc-shaped cone surface, and the small end of the arc-shaped cone surface faces outward, and the inclination angle of the arc-shaped cone surface is 7.5°.

[0010] Another improvement of the above solution is that a concave hole is provided in the center of the bottom surface of the valve plate, and an arc surface matching the concave hole is provided on the inner surface of the valve body below the valve plate.

[0011] The beneficial effect of the utility model is to use the extension part extending downward from the guide groove to provide support for the gate plate, which changes the design of the previous suspended gate plate, greatly increases the contact area between the guide groove and the gate plate, and improves the sealing performance. When the axial medium pressure is greater than the friction force, the gate plate is not only subjected to downward pressure, but also to the lateral blocking force provided by the extension part to the gate plate, which is equivalent to two more aspects of sealing, and will not cause displacement or swing; the two side ears of the gate plate will no longer form pressure shear with the guide groove on the valve body, thereby doubling the service life of the gate valve. The two sealing surfaces of the gate plate are wedge-shaped, and the wedge angle is 6°-8°, which can better reduce the torsion of the gate plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the utility model;

[0013] Figure 2 yes Figure 1 A top view of

[0014] Figure 3 It is a three-dimensional schematic diagram of the utility model;

[0015] In the figure, 1, valve body, 2, guide groove, 3, gate plate, 4, extension part. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] like Figure 1-3 As shown, the utility model comprises: a valve body 1, guide grooves 2 provided on the inner walls of both sides of the valve body, and a gate plate 3 slidingly matched with the guide grooves, wherein the guide grooves have extensions 4 extending downwards and at least partially contacting the lower ends of both sides of the gate plate. The two sides of the gate plate are generally slidably matched in the guide grooves in the valve body through hanging ears, and the length of the guide grooves only contacts the hanging ears of the gate plate. When the gate plate is fully closed, the gate plate is suspended in the guide grooves through the hanging ears. The application increases the contact area with the gate plate through the downwardly extending extensions, on the one hand, and provides additional support for the gate plate on the other hand.

[0018] As a preferred example of the present utility model, the lower end of the gate plate has a matching surface that conformally matches the extension portion.

[0019] As a preferred example of the present invention, the two sealing surfaces of the gate plate are wedge-shaped, and the wedge angle is 6°-8°, which can be 6°, 7.5° or 8°, which can better reduce the torsion on the gate plate.

[0020] As an embodiment of the utility model, the two ends of the valve body are respectively a medium inlet and a medium outlet, and the bottom walls of the medium inlet and the medium outlet are both provided with an arc-shaped conical surface, and the small mouth end of the arc-shaped conical surface faces outward, and the inclination angle of the arc-shaped conical surface is 7.5°.

[0021] As an embodiment of the utility model, a concave hole is provided in the center of the bottom surface of the valve plate, and an arc surface is provided on the inner surface of the valve body below the valve plate to match the concave hole. The arc surface and the concave hole can provide better support for the gate.

Claims

1. Overcome the cantilever anti-displacement elastic sealing gate valve, including: A valve body (1), guide grooves (2) formed on the inner walls of both sides of the valve body, and a gate plate (3) slidably engaged with the guide grooves, wherein the guide grooves have extension portions (4) extending downwardly and at least partially contacting the lower ends of both sides of the gate plate.

2. The cantilever anti-displacement elastic sealing gate valve as claimed in claim 1, characterized in that: The lower end of the gate has a matching surface that conformally matches the extension portion.

3. The cantilever anti-displacement elastic sealing gate valve as claimed in claim 1, characterized in that: The two sealing surfaces of the gate are wedge-shaped, and the wedge angle is 6°-8°.

4. The cantilever anti-displacement elastic sealing gate valve as claimed in claim 1, characterized in that: The two ends of the valve body are respectively a medium inlet and a medium outlet. The bottom walls of the medium inlet and the medium outlet are both provided with an arc-shaped conical surface, and the small end of the arc-shaped conical surface faces outward. The inclination angle of the arc-shaped conical surface is 7.5°.

5. The elastic sealing gate valve for overcoming cantilever displacement as claimed in claim 1, characterized in that: A concave hole is provided at the center of the bottom surface of the gate plate, and an arc surface matching the concave hole is provided on the inner surface of the valve body below the gate plate.

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