Gate valve

Abstract

The utility model belongs to the technical field of valves, and discloses a gate valve which comprises a valve body, a gate plate, a driving piece and a transmission assembly. The valve body comprises a valve seat. The gate plate is arranged in the valve body in a sliding mode and has a closing state for blocking the valve seat and an opening state for opening the valve seat. The driving piece is arranged on the valve body and is in transmission connection with the gate plate through a transmission assembly so as to drive the gate plate to slide to be switched between the closed state and the open state. The driving piece can push the gate plate through the transmission assembly when the gate plate is in the closed state so that the gate plate can tightly abut against the valve seat. According to the gate valve, the driving piece tightly abuts against the gate plate on the valve seat through the transmission assembly, so that a gap between the gate plate and the valve seat when the gate plate is in a closed state can be avoided, namely, the problem of sealing failure can be avoided, and the service life of the gate valve can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a gate valve. Background Art

[0002] Seal failure refers to the situation where the gap between the valve plate and the valve seat increases in the closed state, resulting in a decline in the sealing performance. Seal failure is a key factor affecting the service life of the gate valve.

[0003] However, when the traditional gate valve is opened and closed, the valve plate and the valve seat will wear, resulting in an increase in the gap between the valve plate and the valve seat in the closed state after the traditional gate valve is used for a period of time. That is, seal failure will occur after the traditional gate valve is used for a period of time, thereby affecting the service life.

[0004] Therefore, the above problems need to be solved urgently. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a gate valve to extend the service life.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A gate valve includes:

[0008] A valve body including a valve seat;

[0009] A gate plate is slidably arranged in the valve body and has a closed state for blocking the valve seat and an open state for opening the valve seat;

[0010] A driving member and a transmission assembly, the driving member is arranged on the valve body, and the driving member is in transmission connection with the gate plate through the transmission assembly to drive the gate plate to slide and switch between the closed state and the open state;

[0011] When the gate plate is in the closed state, the driving member can push against the gate plate through the transmission assembly to tightly press the gate plate against the valve seat.

[0012] Preferably, the transmission assembly includes:

[0013] A valve stem is slidably arranged in the valve body and is connected to the moving part of the driving member;

[0014] An elastic connecting member, the gate plate is connected to the valve stem through the elastic connecting member. After the gate plate is in the closed state, the driving member continues to drive the valve stem to slide, and the elastic connecting member abuts against the valve body and deforms;

[0015] A push member is arranged on the valve stem, and the push member can continuously push against the gate plate when the elastic connecting member is deformed.

[0016] Preferably, the gate valve further comprises a back plate, which is connected to the valve stem via the elastic connector, the back plate and the gate plate are respectively located on both sides of the valve stem, and the back plate can be sealed with the other side of the valve seat.

[0017] Preferably, the elastic connecting member is a spring sheet.

[0018] Preferably, the spring sheet comprises a first connecting portion and a second connecting portion which are symmetrically arranged with respect to the valve stem, and opposite sides of the gate plate are respectively connected to the first connecting portion and the second connecting portion.

[0019] Preferably, two opposite sides of the back plate are connected to the first connecting portion and the second connecting portion respectively.

[0020] Preferably, the push member is a ball rotatably arranged on the valve stem, and the gate plate is provided with a guide groove which gradually shrinks along its closing direction, and the ball is located in the guide groove.

[0021] Preferably, a first sealing ring is provided on a side of the gate plate facing away from the back plate.

[0022] Preferably, a second sealing ring is provided on a side of the back plate facing away from the gate plate.

[0023] Preferably, the driving member is a cylinder.

[0024] Beneficial effects of the utility model:

[0025] The drive member presses the gate against the valve seat through the transmission assembly, thereby avoiding a gap between the gate and the valve seat when the gate is in a closed state, that is, avoiding the problem of sealing failure, which helps to extend the service life of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the gate valve provided by the utility model;

[0027] Figure 2 It is a structural schematic diagram of the transmission assembly, gate plate and back plate provided by the utility model;

[0028] Figure 3 It is a structural schematic diagram of the gate provided by the utility model.

[0029] In the figure:

[0030] 1. Valve body; 11. Valve seat; 2. Gate plate; 21. First sealing ring; 3. Driving member; 4. Transmission assembly; 41. Valve stem; 42. Elastic connecting member; 421. First connecting portion; 422. Second connecting portion; 43. Pushing member; 5. Back plate. Detailed implementation manner

[0031] Before explaining any implementation manner of the present application in detail, it should be understood that the present application is not limited to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0032] In the present application, the terms "comprise", "include", "have" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0033] In the present application, the term "and / or" describes the associated relationship of associated objects and indicates that three relationships may exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump may represent: the separate existence of a centrifugal vortex magnetic pump, the simultaneous existence of a centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump, and the separate existence of a centrifugal vortex magnetic pump. In addition, the character " / " in the present application generally represents an "and / or" relationship between the associated objects before and after.

[0034] In the present application, the terms "connect", "combine", "couple", "mount" may be direct connection, combination, coupling or mounting, or may be indirect connection, combination, coupling or mounting. Among them, for example, direct connection means that two parts or components are connected together without setting an intermediate member, and indirect connection means that two parts or components are respectively connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. In addition, "connect" and "couple" are not limited to physical or mechanical connection or coupling, and may include electrical connection or coupling.

[0035] In this application, those of ordinary skill in the art will understand that relative terms used in connection with quantities or conditions (e.g., "about", "approximately", "substantially", etc.) are intended to include the recited value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances resulting from manufacturing, assembly, use in relation to a particular value, etc. Such terms should also be considered to disclose a range defined by the absolute values of two endpoints. The relative term may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values that do not employ relative terms should also be disclosed as having tolerances. In addition, when expressing relative angular positional relationships (e.g., substantially parallel, substantially perpendicular), "substantially" may refer to plus or minus a certain number of degrees (e.g., 1 degree, 5 degrees, 10 degrees or more) from the indicated angle.

[0036] In this application, those of ordinary skill in the art will understand that the functions performed by components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by parts can also be performed by one part, one component, or a combination of multiple parts.

[0037] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", "rear", etc. are described based on the orientation and positional relationship shown in the drawings, and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element. It should also be understood that orientation terms such as the upper side, lower side, left side, right side, front side, rear side, etc. not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, front lower, and rear lower, etc.

[0038] Please refer to Figures 1 to 3 , this embodiment provides a gate valve, which includes a valve body 1, a gate plate 2, a driving member 3, and a transmission assembly 4. The valve body 1 includes a valve seat 11. The gate plate 2 is slidably disposed in the valve body 1 and has a closed state of blocking the valve seat 11 and an open state of opening the valve seat 11. The driving member 3 is disposed on the valve body 1, and the driving member 3 is in transmission connection with the gate plate 2 through the transmission assembly 4 to drive the gate plate 2 to slide and switch between the closed state and the open state. The driving member 3 can, when the gate plate 2 is in the closed state, push against the gate plate 2 through the transmission assembly 4 to tightly press the gate plate 2 against the valve seat 11.

[0039] With such a setting, the driving member 3 presses the gate plate 2 tightly against the valve seat 11 through the transmission assembly 4, thereby avoiding the existence of a gap between the gate plate 2 and the valve seat 11 when the gate plate 2 is in the closed state. That is to say, the problem of seal failure can be avoided, which helps to extend the service life of the gate valve.

[0040] The transmission assembly 4 includes a valve stem 41, an elastic connecting member 42, and a pushing member 43. The valve stem 41 is slidably disposed in the valve body 1 and is connected to the moving part of the driving member 3. The gate plate 2 is connected to the valve stem 41 through the elastic connecting member 42. When the gate plate 2 is in the closed state, the driving member 3 continues to drive the valve stem 41 to slide, and the elastic connecting member 42 abuts against the valve body 1 and deforms. The pushing member 43 is disposed on the valve stem 41, and the pushing member 43 can continuously push the gate plate 2 when the elastic connecting member 42 deforms.

[0041] It can be understood that the gate plate 2 is tightly pressed against the valve seat 11 by the pushing member 43, and the elastic connecting member 42 deforms and can provide a certain buffering force. It can also be understood that even when the fitting position between the gate plate 2 and the valve seat 11 changes due to wear, since the maximum sliding distance of the valve stem 41 is limited by the deformation range of the elastic connecting member 42, and the deformation range of the elastic connecting member 42 is relatively large, it is sufficient to compensate for the increased distance between the gate plate 2 and the valve seat 11.

[0042] Generally, the valve seat 11 includes an inlet side and an outlet side. The gate plate 2 mentioned above is used to cooperate with the inlet side of the valve seat 11. In addition, to prevent the medium from flowing back into the valve seat 11 and impacting the gate plate 2 after flowing in from the outlet side, which affects the sealing performance of the gate plate 2 when it is in the closed state. In this embodiment, the gate valve further includes a back plate 5. The back plate 5 is connected to the valve stem 41 through the elastic connecting member 42. The back plate 5 and the gate plate 2 are located on both sides of the valve stem 41 respectively, and the back plate 5 can be hermetically fitted with the other side of the valve seat 11. Specifically, the back plate 5 is used to cooperate with the outlet side of the valve seat 11, so as to avoid the influence of the reverse flow of the received medium on the sealing performance of the gate valve.

[0043] In this embodiment, the elastic connecting member 42 is a spring plate. The spring plate includes a first connecting portion 421 and a second connecting portion 422 that are symmetrically disposed with respect to the valve stem 41. The opposite sides of the gate plate 2 are respectively connected to the first connecting portion 421 and the second connecting portion 422, so as to be able to synchronously drive the opposite sides of the gate plate 2 to approach the valve seat 11, avoid the situation where one side of the gate plate 2 warps, and further enable the gate plate 2 to be accurately hermetically fitted with the valve seat 11.

[0044] Correspondingly, the two opposite sides of the back plate 5 are respectively connected to the first connecting portion 421 and the second connecting portion 422. With such a setting, it is possible to synchronously drive the two opposite sides of the back plate 5 close to the valve seat 11, avoid the situation where one side of the back plate 5 warps, and thus enable the back plate 5 to be accurately and sealingly fitted with the valve seat 11. It should be noted that since the moving directions of the back plate 5 and the gate plate 2 are opposite, the first connecting portion 421 is correspondingly provided with two connecting positions with opposite moving directions to correspondingly connect the gate plate 2 and the back plate 5. Of course, the second connecting portion 422 also needs to be correspondingly provided with two connecting positions with opposite moving directions to correspondingly connect the gate plate 2 and the back plate 5. It should be noted that the specific structure of the elastic piece is designed according to the actual application scenario and will not be elaborated further. It should also be noted that in this embodiment, both the gate plate 2 and the back plate 5 are connected to the elastic piece by a bolt structure. Specifically, studs are integrally formed on the gate plate 2 and the back plate 5, and the studs pass through the elastic piece and are screwed with nuts.

[0045] The pushing member 43 is a ball rotatably arranged on the valve stem 41, and a guiding groove that gradually narrows along the closing direction of the gate plate 2 is provided on the gate plate 2. The ball is located in the guiding groove. When the gate plate 2 is closed, the valve stem 41 continuously pushes the elastic connecting member 42 to deform, and the ball will slide along the guiding groove. Since the guiding groove gradually narrows, the ball will gradually protrude outside the guiding groove, thereby pushing the gate plate 2 to move, and further enabling the gate plate 2 to abut against the valve seat 11.

[0046] With such a setting, it is possible to expand the gate plate 2 through the ball so that the gate plate 2 abuts against the valve seat 11. The structure is simple and the movement is reliable. It should be noted that the number of balls can be selected according to the actual application scenario, and the number and position of the guiding grooves are set corresponding to the number and position of the balls. In this embodiment, two balls are provided, and two guiding grooves are correspondingly provided. It should also be noted that the driving structure of the back plate 5 is the same as the structure composed of the above-mentioned balls and guiding grooves, so it will not be elaborated.

[0047] To further improve the sealing performance of the gate valve, a first sealing ring 21 is provided on the side of the gate plate 2 facing away from the back plate 5. Further, a second sealing ring is provided on the side of the back plate 5 facing away from the gate plate 2. It should be noted that the first sealing ring 21 and the second sealing ring are selected as existing O-rings.

[0048] In this embodiment, the driving member 3 is a cylinder, and the cylinder has the advantages of a compact structure, fast response speed, high reliability, etc. In other embodiments, the driving member 3 can be any linear driving structure in the prior art, such as a linear module, an electric cylinder, etc.

[0049] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A gate valve, characterized in that, Comprising: A valve body (1), including a valve seat (11); A gate plate (2), slidably disposed within the valve body (1), and having a closed state of blocking the valve seat (11) and an open state of opening the valve seat (11); A driving member (3) and a transmission assembly (4), the driving member (3) is disposed on the valve body (1), and the driving member (3) is drivingly connected to the gate plate (2) through the transmission assembly (4) to drive the gate plate (2) to slide and switch between the closed state and the open state; When the gate plate (2) is in the closed state, the driving member (3) can push against the gate plate (2) through the transmission assembly (4) to tightly press the gate plate (2) against the valve seat (11).

2. A gate valve according to claim 1, characterized in that, The transmission assembly (4) includes: A valve stem (41), slidably disposed within the valve body (1), and connected to the moving part of the driving member (3); An elastic connecting member (42), the gate plate (2) is connected to the valve stem (41) through the elastic connecting member (42). After the gate plate (2) is in the closed state, the driving member (3) continues to drive the valve stem (41) to slide, and the elastic connecting member (42) abuts against the valve body (1) and deforms; A pushing member (43), disposed on the valve stem (41), and the pushing member (43) can continuously push against the gate plate (2) when the elastic connecting member (42) deforms.

3. A gate valve according to claim 2, characterized in that, The gate valve further includes a back plate (5), the back plate (5) is connected to the valve stem (41) through the elastic connecting member (42), the back plate (5) and the gate plate (2) are respectively located on both sides of the valve stem (41), and the back plate (5) can be hermetically engaged with the other side of the valve seat (11).

4. A gate valve according to claim 3, characterized in that, The elastic connecting member (42) is a spring piece.

5. A gate valve according to claim 4, characterized in that, The spring piece includes a first connecting portion (421) and a second connecting portion (422) symmetrically disposed about the valve stem (41), and opposite sides of the gate plate (2) are respectively connected to the first connecting portion (421) and the second connecting portion (422).

6. A gate valve according to claim 5, characterized in that, Opposite sides of the back plate (5) are respectively connected to the first connecting portion (421) and the second connecting portion (422).

7. A gate valve according to claim 3, characterized in that, The pushing member (43) is a ball rotatably disposed on the valve stem (41), and a guide groove gradually narrowing along its closing direction is provided on the gate plate (2), and the ball is located within the guide groove.

8. A gate valve according to claim 3, characterized in that, A first sealing ring (21) is provided on the side of the gate plate (2) facing away from the back plate (5).

9. A gate valve according to claim 3, characterized in that, A second sealing ring is provided on the side of the back plate (5) facing away from the gate plate (2).

10. A gate valve according to claim 1, characterized in that, The driving member (3) is a cylinder.

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