Valve body and gate valve

Abstract

The utility model relates to the technical field of gate valves, in particular to a valve body and a gate valve. The valve body comprises a main body part and two end heads which are respectively fixed on two sides of the main body part, a main cavity is arranged in the main body part, one end of each end head is respectively provided with a sealing ring, each sealing ring respectively extends into the main cavity, and the end surface of each sealing ring forms a sealing surface; the outer side face of the sealing ring and the inner wall of the main cavity define a tool withdrawal groove arranged in the circumferential direction of the sealing ring. The gate valve comprises the valve body, the outer side face of the sealing ring and the inner wall of the main cavity define the tool withdrawal groove arranged in the circumferential direction of the sealing ring, and due to the fact that the tool withdrawal groove is arranged in the circumferential direction of the sealing ring, a tool nose can be prevented from making contact or colliding with the inner wall of the main body part when a tool machines the sealing face, tool breaking is prevented, and the service life of the gate valve is prolonged. The abrasion loss of the cutter is reduced, the machining quality and machining efficiency of the sealing ring are improved, and meanwhile the sealing performance of the gate valve is improved.

Description

Technical Field

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

[0002] The gate valve is a kind of valve widely used in the pipe network system, also known as the gate valve or gate valve. The gate valve includes the valve body, valve cover and valve stem. The valve cover is threadedly installed on the main hole of the valve body, the valve stem is threadedly connected to the valve cover, and the gate on the valve stem extends into the main chamber of the valve body. The gate is driven by the valve stem to move up and down, so that the valve plate can cut off or open the flow of the medium in the pipeline.

[0003] The existing valve body is usually formed by brass forging, and an annular sealing ring is arranged on both sides of the main chamber in the valve body, and the sealing ring has a sealing surface that cooperates with the gate seal. The sealing surface of the sealing ring has processing space only in the upper part of the circumference, and the other circumferential parts of the sealing ring are connected to the inner wall of the valve body. When the tool processes the sealing surface, the tip of the tool will contact or collide with the inner wall of the valve body, which is easy to accelerate the wear of the tool, reduce the processing efficiency and the processing quality of the sealing surface, and thus reduce the sealing performance of the valve body. Utility Model Content

[0004] One purpose of the utility model is to provide a valve body to avoid contact or collision between a cutter and an inner wall of the valve body, thereby improving the processing quality and efficiency of a sealing ring and improving the sealing performance of the valve body.

[0005] Another object of the utility model is to provide a gate valve to prevent the contact or collision between the cutter and the inner wall of the valve body, thereby improving the processing quality and efficiency of the sealing ring and improving the sealing performance of the gate valve.

[0006] To achieve this purpose, the technical solution adopted by the utility model is:

[0007] A valve body, the valve body comprising a main body and two end heads respectively fixed on both sides of the main body, the main body having a main chamber, one end of each end head being respectively provided with a sealing ring, each sealing ring respectively extending into the main chamber, and the end face of each sealing ring forming a sealing surface, the outer side surface of the sealing ring and the inner wall of the main chamber forming a circumferentially arranged back-cut groove surrounding the sealing ring.

[0008] As an optional solution for the valve body, the outer side surface is a conical surface, and the sealing surface is a small-diameter end of the conical surface.

[0009] As an optional solution for the valve body, the angle between the outer side surface and the sealing surface is greater than 90° and less than 180°.

[0010] As an optional solution for the valve body, the main body and the two end heads are integrally formed by casting.

[0011] As an optional solution for the valve body, the valve body is a stainless steel valve body.

[0012] As an optional solution for the valve body, the main body further comprises a housing chamber located above the main chamber, the housing chamber is communicated with the main chamber and is used to accommodate a gate plate that cooperates with the sealing ring.

[0013] As an optional solution for the valve body, the inner side wall of the end head is provided with an internal thread so that the end head can be threadedly connected to a pipeline.

[0014] A gate valve comprises the valve body mentioned above.

[0015] The beneficial effects of the utility model are:

[0016] The valve body provided by the utility model comprises a main body and an end head, and the outer side surface of the sealing ring in the main body and the inner wall of the main chamber of the main body form a circumferentially arranged back-cut groove surrounding the sealing ring. Since the back-cut groove is arranged circumferentially around the sealing ring, processing space is reserved for the tool, so that the tool tip is prevented from contacting or colliding with the inner wall of the valve body when the tool is processing the sealing surface, and the tool is prevented from breaking, effectively reducing the wear of the tool, improving the processing quality and processing efficiency of the sealing ring, and thus improving the sealing performance of the gate valve.

[0017] The gate valve proposed by the utility model includes the above-mentioned valve body. Since the tool withdrawal groove is circumferentially arranged around the sealing ring, processing space is reserved for the tool, avoiding contact or collision between the tool tip and the inner wall of the valve body when the tool is processing the sealing surface, preventing tool breakage, effectively reducing tool wear, improving the processing quality and processing efficiency of the sealing ring, and thus improving the sealing performance of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a valve body provided by an embodiment of the utility model;

[0019] Figure 2 is a cross-sectional view of a valve body provided by an embodiment of the utility model;

[0020] Figure 3 It is a longitudinal cross-sectional view of the valve body provided by the embodiment of the utility model.

[0021] The names and numbers of the components in the figure are as follows:

[0022] 1. Main body; 11. Main chamber; 12. Sealing ring; 121. Outer side surface; 122. Sealing surface; 120. Back-off groove; 13. Accommodating chamber; 14. Main hole; 2. End; 21. End hole. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0027] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0028] like Figure 1 As shown, this embodiment proposes a gate valve, which is mainly used in a pipe network system, such as a water supply pipe, etc., and is not specifically limited here.

[0029] Specifically, Figure 1 and Figure 2As shown, the gate valve includes a valve body, a valve cover and a valve stem, etc., and a gate is installed at the bottom end of the valve stem. The valve body includes a main body 1 and two end caps 2 respectively fixed on both sides of the main body 1. The main body 1 has a main chamber 11 and a receiving chamber 13. One end of each end cap 2 is respectively provided with a sealing ring 12, and each sealing ring 12 extends into the main chamber 11, and the end face of each sealing ring 12 forms a sealing surface 122. The receiving chamber 13 is located above the main chamber 11, and the receiving chamber 13 is connected to the main chamber 11 and is used to accommodate the gate matched with the sealing ring 12. The two end caps 2 are respectively connected to the main chamber 11 through the corresponding sealing rings 12, so that the main body 1 is roughly in an inverted T-shaped structure. The inner side wall of the end cap 2 is provided with an internal thread, and the end cap 2 is connected to the pipeline thread. The end of the end piece 2 away from the main body 1 is provided with an end hole 21, and the external pipeline extends into the corresponding end piece 2 through the end hole 21 and is threadedly connected with the end piece 2 to connect the valve body to the pipeline. The connection between the end piece 2 and the pipeline is realized by threading, which not only improves the efficiency of disassembly and assembly of the end piece 2 and the pipeline, but also realizes the sealed connection between the end piece 2 and the pipeline.

[0030] In this embodiment, the top of the main body 1 is provided with a main hole 14 connected to the accommodating chamber 13, and a valve cover is provided on the main hole 14. The main hole 14 is threadedly connected to the valve cover. The valve cover is threadedly screwed on the main hole 14, the valve stem is rotatably inserted into the valve cover, and the gate plate threadedly connected thereto can move up and down relative to the valve cover. When the gate plate is raised to the open position, the gate plate is located in the accommodating chamber 13, and the two end heads 2 are connected through the main chamber 11 to open the valve body; when the gate plate is lowered to the closed position, the gate plate is located in the main chamber 11 and is sandwiched between the two sealing rings 12, and the gate plate is tightly fitted with the sealing surfaces 122 of the two sealing rings 12 respectively to close the valve body.

[0031] The existing valve body is usually formed by brass forging, and only the upper part of the sealing ring is left with processing space, while the other parts of the sealing ring are connected to the inner wall of the valve body. When the tool processes the sealing surface, the tip of the tool will contact or collide with the inner wall of the valve body, which is easy to accelerate the wear of the tool, reduce the processing efficiency and the processing quality of the sealing surface, and thus reduce the sealing performance of the valve body.

[0032] To solve the above problems, Figure 2 and Figure 3 As shown, in the valve body of this embodiment, the outer side surface 121 of the sealing ring 12 and the inner wall of the main chamber 11 form a tool-retracting groove 120 arranged circumferentially around the sealing ring 12, that is, the sealing surface 122 protrudes from the inner wall of the main body 1. Since the tool-retracting groove 120 is arranged circumferentially around the sealing ring 12, processing space is reserved for the tool, which prevents the tool tip from contacting or colliding with the inner wall of the main body 1 when the tool is processing the sealing surface 122, prevents the tool from breaking, effectively reduces the wear of the tool, improves the processing quality and processing efficiency of the sealing ring 12, and thus improves the sealing performance of the gate valve.

[0033] Specifically, Figure 2 and Figure 3 As shown, the outer side surface 121 is a conical surface, and the sealing surface 122 is the small diameter end of the conical surface so that the sealing ring 12 is a trapezoidal ring. By setting the outer side surface 121 as a conical surface, the thickness of the sealing ring 12 gradually becomes thinner from the large diameter end to the small diameter end, that is, the sealing surface 122 is the thinnest, which reduces the machining removal amount of the sealing ring 12 and improves the machining efficiency of the valve body.

[0034] It should be noted that the shape of the backing groove 120 around the sealing ring 12 is not consistent. Figure 2 As shown, the majority of the sealing ring 12 is located in the main chamber 11, and only a small portion of the top extends into the bottom of the accommodating chamber 13, so that the outer side surface 121 of the sealing ring 12 located in the main chamber 11 can form a substantially U-shaped backing groove 120 with the inner wall of the main chamber 11. The outer side surface 121 of the sealing ring 12 located in the accommodating chamber 13 can form a substantially L-shaped backing groove 120 with the inner wall of the accommodating chamber 13.

[0035] like Figure 3 As shown, the angle between the outer side surface 121 and the sealing surface 122 is greater than 90° and less than 180°, that is, 90°<α<180°. By setting the outer side surface 121 as an inclined surface, the outer side surface 121 on the sealing ring 12 intersects with the sealing surface 122 at an obtuse angle, and no winding accumulation burrs are generated when the tool processes the sealing surface 122, which effectively improves the processing quality of the sealing ring 12 and improves the sealing performance of the valve body.

[0036] In this embodiment, the valve body is made of stainless steel, and its main body 1 and two end caps 2 are integrally formed by casting to improve the processing efficiency and structural strength of the valve body. Specifically, the valve body is a stainless steel valve body, so that the undercut groove 120 is directly formed by casting to ensure that the undercut groove 120 can surround the sealing ring 12 360° in the circumferential direction, thereby reducing the processing difficulty of the undercut groove 120 and improving the processing efficiency of the valve body.

[0037] The gate valve of this embodiment includes the above-mentioned valve body. Since the tool withdrawal groove 120 is circumferentially arranged around the sealing ring 12, processing space is reserved for the tool, thereby avoiding contact or collision between the tool tip and the inner wall of the valve body when the tool is processing the sealing surface 122, preventing tool breakage, effectively reducing tool wear, and improving the processing quality and efficiency of the sealing ring 12, thereby improving the sealing performance of the gate valve.

[0038] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A valve body, the valve body comprising a main body (1) and two end heads (2) respectively fixed on both sides of the main body (1), the main body (1) having a main chamber (11), one end of each end head being respectively provided with a sealing ring (12), each sealing ring (12) respectively extending into the main chamber (11), and an end face of each sealing ring (12) forming a sealing face (122), characterized in that: The outer side surface (121) of the sealing ring (12) and the inner wall of the main chamber (11) form a cutter retreat groove (120) which is arranged circumferentially around the sealing ring (12).

2. The valve body according to claim 1, characterized in that: The outer side surface (121) is a conical surface, and the sealing surface (122) is a small-diameter end of the conical surface.

3. The valve body according to claim 2, characterized in that: The included angle between the outer side surface (121) and the sealing surface (122) is greater than 90° and less than 180°.

4. The valve body according to claim 1, characterized in that: The main body (1) and the two end heads (2) are integrally formed by casting.

5. The valve body according to claim 4, characterized in that: The valve body is a stainless steel valve body.

6. The valve body according to any one of claims 1 to 5, characterized in that: The main body (1) also has a receiving chamber (13) located above the main chamber (11); the receiving chamber (13) is communicated with the main chamber (11) and is used to accommodate a gate plate that cooperates with the sealing ring (12).

7. The valve body according to any one of claims 1 to 5, characterized in that: The inner side wall of the end head (2) is provided with an internal thread so that the end head (2) can be threadedly connected to a pipeline.

8. Gate valve, characterized in that, A valve body comprising the valve body according to any one of claims 1 to 7.

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