Gate valve

Abstract

The utility model belongs to the field of gate valves, and particularly discloses a gate valve which comprises a valve deck, a valve rod, a positioning ring, a pressing piece and a self-lubricating gasket, the positioning ring is coaxially connected to the valve rod, the valve rod is connected to the valve deck through the positioning ring, the pressing piece is detachably connected to the valve deck so as to axially limit the positioning ring, and the self-lubricating gasket is arranged on the valve deck. The valve rod penetrates through the valve cover and is arranged in a rotating mode with the axis of the valve rod as a rotating shaft, and the self-lubricating gasket is arranged between the valve rod and the valve cover. According to the valve, the valve rod is rotationally connected with the valve cover, the self-lubricating gasket is arranged between the valve rod and the valve cover to reduce friction, lubricating oil does not need to be added between the valve rod and the valve cover, abrasion resistance and corrosion resistance are achieved, friction and abrasion between the valve rod and the valve cover are reduced under the condition that no external lubricating agent exists, the service life is prolonged, reliability is improved, and human health cannot be affected.

Description

Technical Field

[0001] The present application belongs to the field of gate valves, and more specifically, relates to a gate valve. Background Art

[0002] A gate valve is a valve whose opening and closing part is a gate. Controlling the movement of the gate can realize the opening and closing of the valve. The movement direction of the gate is perpendicular to the direction of the fluid. It is more labor-saving to open and close and has a wide range of applications. It can be installed on the fluid pipeline to achieve flow interception.

[0003] In the related art, a gate valve generally includes a valve body, a valve cover, a gate plate, and a valve stem. The valve body has a channel for fluid to pass through, and a cavity for placing the gate plate is formed between the valve body and the valve cover. A slide groove is provided on the side wall of the channel, and the gate plate is slidably connected to the slide groove. The valve stem passes through the valve cover and is rotatably connected to the valve cover. The bottom of the valve stem is threadedly connected to the gate plate, and the gate plate is raised and lowered by rotating the valve stem. Lubricating oil needs to be regularly added between the valve stem and the valve cover to reduce friction. The common method is to directly inject lubricating oil into the gap between the valve cover and the valve cover or to open an oil injection hole on the valve cover that is connected to the gap to inject lubricating oil. However, the injection of lubricating oil is prone to oil leakage and pollution, requiring staff to clean and handle, which increases labor intensity. Utility Model Content

[0004] In response to the defects of the prior art, the present application provides a gate valve, which aims to solve the problem that the existing gate valve is prone to oil leakage and pollution when lubricating oil is injected between the valve stem and the valve cover.

[0005] A gate valve provided in the present application specifically includes a valve cover, a valve stem, a positioning ring, a clamping piece and a self-lubricating gasket. The positioning ring is coaxially connected to the valve stem, and the valve stem is connected to the valve cover through the positioning ring. The clamping piece is detachably connected to the valve cover to axially limit the positioning ring. The valve stem passes through the valve cover and is rotatably arranged with its axis as the rotation axis. The self-lubricating gasket is arranged between the valve stem and the valve cover.

[0006] Through the above technical solutions conceived by the present application, compared with the prior art, since the valve stem in the present application can be conveniently installed on the valve cover, the valve stem and the valve cover are rotatably connected, the valve stem can be positioned by the positioning ring, and a self-lubricating gasket is provided between the valve stem and the valve cover to reduce friction, it is possible to obtain the beneficial effects of not needing to add lubricating oil between the valve stem and the valve cover, being wear-resistant and rust-proof, reducing friction and wear between the valve stem and the valve cover in the absence of external lubricants, improving service life and reliability, and not affecting human health.

[0007] As a further preference, the valve stem and the valve cover are detachably connected.

[0008] By adopting the above technical solution, the valve stem can be replaced and maintained to ensure the operating accuracy of the gate valve.

[0009] As a further preferred embodiment, a positioning groove adapted to be embedded in the positioning ring is provided on the valve cover.

[0010] By adopting the above technical solution, the locating ring is installed in the locating groove when the valve stem is installed, so that the valve stem installation is more stable.

[0011] As a further preferred embodiment, an annular groove is provided on the valve stem, and the positioning ring is fixedly connected in the annular groove.

[0012] By adopting the above technical solution, the valve stem and the locating ring are connected in an assembled manner, and a suitable valve stem and locating ring can be selected according to the installation requirements, which has better applicability.

[0013] As a further preference, the positioning ring and the valve stem are an integrally formed structure.

[0014] By adopting the above technical solution, the positioning ring and the valve body are manufactured in one piece, thereby improving the connection strength.

[0015] As a further preferred embodiment, a protrusion is provided on the lower surface of the pressing member, and the protrusion is inserted into the positioning groove.

[0016] By adopting the above technical solution, the protrusion is inserted into the positioning groove to limit the clamping piece, ensuring the concentricity of the assembly of the clamping piece and the valve cover, and then ensuring that the valve stem has good axial centrality, low friction and light torque after assembly.

[0017] As a further preference, the self-lubricating gaskets are provided in two groups, one group of the self-lubricating gaskets is provided below the positioning ring, and the other group of the self-lubricating gaskets is provided above the positioning ring.

[0018] By adopting the above technical solution, when the locating ring rotates, the friction force on the upper surface and the friction force on the lower surface of the locating ring can be reduced simultaneously by the two sets of self-lubricating gaskets, thereby making the rotation of the valve stem more stable.

[0019] As a further preferred embodiment, a sealing member is provided between the pressing member and the valve stem and the valve cover.

[0020] By adopting the above technical solution, the overall sealing performance of the gate valve is improved.

[0021] As a further preference, the valve stem and / or the pressing member and / or the valve cover are all provided with an installation groove for installing the sealing member.

[0022] By adopting the above technical solution, the sealing member is located in the installation groove, making its installation more stable and further improving the sealing performance of the gate valve.

[0023] As a further preference, the gate valve further includes a dust ring, which is arranged between the pressing member and the valve stem.

[0024] By adopting the above technical solution, the provision of the dust ring can prevent dust from entering between the valve stem and the pressing member, causing increased friction, and at the same time can prevent dust from contacting the self-lubricating gasket and affecting its use effect.

[0025] In general, the above technical solutions conceived by this application have the following technical advantages compared with the existing technologies:

[0026] 1. The valve stem in this application can be conveniently installed on the valve cover via a locating ring. The valve stem and valve cover are rotatably connected, and the gate disc in the gate valve can be raised and lowered by rotating the valve stem. A self-lubricating gasket is provided between the valve stem and valve cover to reduce friction. During use, no lubricant is required between the valve stem and valve cover. The valve stem is wear-resistant and rust-resistant. In the absence of external lubricants, friction and wear between the valve stem and valve cover are reduced, thereby improving service life and reliability. It does not affect human health and has low torque, is maintenance-free, and is safe and hygienic.

[0027] 2. The bottom of the clamping member of this application is provided with a raised portion, which is inserted into the positioning groove to limit the clamping member, ensuring the concentricity of the assembly of the clamping member and the valve cover, and thus ensuring that the valve stem has good axial centering, low friction and light torque after assembly.

[0028] 3. In this application, a dust ring is provided between the compression member and the valve stem. The dust ring prevents dust from entering between the valve stem and the compression member, thereby increasing friction, and also prevents dust from contacting the self-lubricating gasket, thereby affecting its performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the gate valve provided in an embodiment of the present application;

[0030] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0031] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0032] 1. Valve body; 2. Valve cover; 21. Positioning groove; 22. Mounting groove; 3. Valve stem; 31. Annular groove; 4. Positioning ring; 5. Pressing piece; 51. Raised part; 6. Self-lubricating gasket; 7. Seal; 8. Dust ring; 9. Gate. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0034] Reference Figure 1-2 , a gate valve disclosed in the present application includes a valve body 1, a valve cover 2, a valve stem 3, a positioning ring 4, a pressing piece 5 and a gate plate 9. A flow channel is opened inside the valve body 1, and the valve cover 2 is fixedly installed on the valve body 1 by bolts. A accommodating cavity for installing the gate plate 9 is provided between the valve cover 2 and the flow channel, and the accommodating cavity is communicated with the flow channel to realize opening and closing of the flow channel by the gate plate 9. The positioning ring 4 is coaxially fixedly connected to the valve stem 3, and the valve stem 3 is detachably connected to the valve cover 2 through the positioning ring 4. The pressing piece 5 is detachably connected to the valve cover 2 by bolts to axially limit the positioning ring 4. The valve stem 3 passes through the valve cover 2 and can be rotatably set with its axis as the rotation axis. The bottom of the valve stem 3 is threadedly connected to the gate plate 9, and is connected to the gate plate 9 by the valve cover 2. The valve stem 3 is rotated to realize the lifting and lowering of the gate plate. This structure is a common structure in gate valves and will not be described in detail here. The self-lubricating gasket 6 is arranged between the valve stem 3 and the valve cover 2, so as to reduce the friction of the valve stem 3 when rotating. There is no need to add lubricating oil between the valve stem 3 and the valve cover 2. It is wear-resistant and rust-resistant. In the absence of external lubricant, it reduces the friction and wear between the valve stem 3 and the valve cover 2, thereby improving the service life and reliability. The self-lubricating gasket 6 is made of steel plate as the base, spherical bronze powder sintered in the middle, and polytetrafluoroethylene and a mixture rolled on the surface. It has the characteristics of low friction coefficient, wear resistance, good corrosion resistance and oil-free lubrication, which can reduce costs, reduce mechanical volume, avoid shaft biting and reduce noise.

[0035] In this embodiment, a positioning groove 21 is provided in the middle of the valve cover 2, which is adapted to be embedded in the positioning ring 4. After the valve stem 3 passes through the valve cover 2, the positioning ring 4 enters the positioning groove 21, thereby improving the installation stability of the valve stem 3. In a feasible embodiment, an annular groove 31 is provided on the valve stem 3, and the positioning ring 4 is fixedly installed in the annular groove 31. The valve stem 3 and the positioning ring 4 are connected in an assembled manner, and suitable valve stem 3 and positioning ring 4 can be selected according to installation requirements; in another feasible embodiment, the positioning ring 4 can also be manufactured by integral molding with the valve stem 3.

[0036] Specifically, the clamping piece 5 is annular in structure and has a through hole in the middle for the valve stem 3 to pass through. A protrusion 51 is provided on the lower surface of the clamping piece 5. The protrusion 51 is coaxially arranged with the through hole. The protrusion 51 is inserted into the positioning groove 21 to limit the clamping piece 5, ensuring the concentricity of the assembly of the clamping piece 5 and the valve cover 2, and further ensuring that the valve stem 3 has good axial centrality, low friction and light torque after assembly.

[0037] Furthermore, the self-lubricating gasket 6 has an annular structure and is provided in two groups, each group is provided with at least two self-lubricating gaskets 6, and can be increased to multiple groups according to actual use needs. The self-lubricating gasket 6 is sleeved on the valve stem 3 and one group of self-lubricating gaskets 6 is provided below the positioning ring 4, and the other group of self-lubricating gaskets 6 is provided above the positioning ring 4, which can simultaneously reduce the friction force on the upper surface and the friction force on the lower surface of the positioning ring 4, thereby making the rotation of the valve stem 3 more stable.

[0038] In order to improve the sealing performance of the gate valve, the gate valve includes multiple seals 7, which are made of annular rubber material. The seals 7 are arranged between the clamping member 5 and the valve stem 3 and the valve cover 2, and the valve stem 3 and / or the clamping member 5 and / or the valve cover 2 are provided with installation grooves 22 for installing the seals 7, thereby improving the installation stability of the seals 7.

[0039] Furthermore, the gate valve also includes a dust ring 8, which is made of an annular rubber material. The dust ring 8 is sleeved on the valve stem 3 and is located between the clamping piece 5 and the valve stem 3. The setting of the dust ring 8 can prevent dust from entering between the valve stem 3 and the clamping piece 5, causing increased friction, and at the same time can prevent dust from entering the positioning groove 21 and contacting the self-lubricating gasket 6 to affect its use effect.

[0040] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0041] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0043] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0044] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A gate valve, characterized in that: The valve cover (2) comprises a valve cap (2), a valve stem (3), a positioning ring (4), a pressing piece (5) and a self-lubricating gasket (6), wherein the positioning ring (4) is coaxially connected to the valve stem (3), the valve stem (3) is connected to the valve cap (2) via the positioning ring (4), the pressing piece (5) is detachably connected to the valve cap (2) to limit the axial position of the positioning ring (4), the valve stem (3) passes through the valve cap (2) and is rotatably arranged with its axis as the rotation axis, and the self-lubricating gasket (6) is arranged between the valve stem (3) and the valve cap (2).

2. A gate valve according to claim 1, characterized in that: The valve stem (3) and the valve cover (2) are detachably connected.

3. A gate valve according to claim 2, characterized in that: The valve cover (2) is provided with a positioning groove (21) adapted to be embedded in the positioning ring (4).

4. A gate valve according to claim 3, characterized in that: An annular groove (31) is provided on the valve stem (3), and the positioning ring (4) is fixedly connected in the annular groove (31).

5. A gate valve according to claim 3, characterized in that: The positioning ring (4) and the valve stem (3) are an integrally formed structure.

6. A gate valve according to claim 3, characterized in that: A protrusion (51) is provided on the lower surface of the pressing member (5), and the protrusion (51) is inserted into the positioning groove (21).

7. A gate valve according to claim 3, characterized in that: The self-lubricating gaskets (6) are provided in two groups, one group of the self-lubricating gaskets (6) is provided below the positioning ring (4), and the other group of the self-lubricating gaskets (6) is provided above the positioning ring (4).

8. A gate valve according to claim 3, characterized in that: A sealing member (7) is provided between the pressing member (5), the valve stem (3) and the valve cover (2).

9. A gate valve according to claim 8, characterized in that: The valve stem (3) and / or the pressing member (5) and / or the valve cover (2) are all provided with an installation groove (22) for installing the sealing member (7).

10. A gate valve according to claim 3, characterized in that: The gate valve further comprises a dust ring (8), wherein the dust ring (8) is arranged between the pressing member (5) and the valve stem (3).

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