Plug valve body and plug valve

Abstract

The plug valve body comprises the valve body, the valve body comprises a middle body, pipe bodies arranged at the two ends of the middle body and flanges arranged at the outer ends of the two pipe bodies, and a plug cavity and a flow channel are arranged in the middle body and the pipe bodies respectively; the pipe body comprises a straight cylinder part and a buffer part which are far away from the middle body, the sections of the straight cylinder part in the extending direction are the same, the buffer part is conical, and the outer contour area of the end, close to the corresponding flange, of the buffer part is larger than the outer contour area of the end, far away from the corresponding flange, of the buffer part. The plug valve is high in structural strength, the buffer structure is arranged for transition, deformation of the position, corresponding to the plug cock cavity, of the valve body due to stress concentration is avoided, reliable sealing of matching of the plug cock and the plug cock cavity is guaranteed, and the service life of the plug valve is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, especially is a kind of plug valve valve body and plug valve. BACKGROUND

[0002] Plug valve is the closing piece or plunger-shaped rotary valve, by rotating 90 degrees to make the passage port on valve plug and the passage port on valve body communicate or separate, realize the opening or closing of a kind of valve.Its valve plug shape can be cylindrical or conical.In cylindrical valve plug, passage is generally rectangular;And in conical valve plug, passage is trapezoidal.These shapes make the structure of plug valve become light and smart.It is most suitable for being used as cut-off and on-off medium and shunt application, but sometimes also can be used for throttling according to applicable properties and the erosion resistance of sealing surface.

[0003] At present, the plug valve valve body on the market, more like the Chinese utility model patent for a kind of plug valve casting valve body assembly disclosed in application No.CN202222933141.1, the part of plug valve valve body corresponding to flow passage is straight cylindrical tube, there is also a part of trumpet shape on the market, in actual use process, after the flange at both ends of valve body is connected with pipeline, usually the flange at both ends of valve body will be subjected to certain tension, since the stress of the junction of the part of plug valve valve body corresponding to passage and the part corresponding to plug cavity (for installing plug) is maximum, after a period of use, the position of valve body corresponding to plug cavity is deformed, that is, the cross section of plug cavity is stretched into ellipse from circle, so that the cooperation between plug and plug cavity has gap, thereby causing leakage, and service life is shorter. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of plug valve valve body and plug valve, the utility model has high structural strength, transition is carried out by setting buffer structure, avoid the position of valve body corresponding to plug cavity from being deformed due to stress concentration, to ensure the reliable sealing of the cooperation of plug and plug cavity, greatly improve the service life of plug valve.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of plug valve valve body, including valve body, the valve body includes middle body, the pipe body being set at the both ends of middle body and the flange being set at the outer end of two pipe bodies, the middle body and pipe body are respectively equipped with plug cavity and flow passage;The pipe body includes straight cylinder portion in the direction away from middle body and buffer portion, the cross section of straight cylinder portion in extension direction is same, the buffer portion is conical shape, and the outer contour area of one end close to corresponding flange of buffer portion is greater than the outer contour area of one end away from corresponding flange.

[0006] By adopting the technical scheme, the pipe body on the valve body is provided as a straight cylinder part and a buffer part, the buffer part is in a conical shape, the junction of the straight cylinder part and the buffer part is the weakest in strength, when the flanges at both ends of the valve body are subjected to tension, the main stress on the valve body is concentrated at the junction of the straight cylinder part and the buffer part, after long-term use, only a slight deformation of the valve body occurs at the position, the cross section of the plug cavity always remains a perfect circle, the reliable sealing of the cooperation between the plug and the plug cavity can be ensured, and the service life of the plug valve is greatly improved.

[0007] The utility model further sets up, the straight cylinder part and buffer part thickness of pipe body are same.

[0008] By adopting the technical scheme, the junction of the straight cylinder part and the buffer part is the weakest in strength, so that the buffering function is realized.

[0009] The utility model further sets up, the straight cylinder part of pipe body is equipped with a plurality of supplementary shrinkage of the outside wall.

[0010] By adopting the technical scheme, the strength of the straight cylinder part of the pipe body can be ensured, the thermal expansion and cold contraction deformation of the straight cylinder part can be avoided, and the deformation of the one end of the straight cylinder part close to the middle body under the action of external force can be avoided.

[0011] The utility model further provides a kind of plug valve, including the plug valve valve body of above, still including valve cover, bottom cover, valve rod and plug, the valve body upper and lower ends are respectively opened, the valve cover and bottom cover are respectively installed in valve body upper and lower ends, the valve rod is inserted into plug cavity and is connected with the plug of valve cover, the plug cavity is equipped with the bushing that is attached with plug outer wall and constitutes sealing cooperation, the plug is equipped with the overflow hole corresponding with the flow channel.

[0012] By adopting the technical scheme, the plug valve uses the valve body with buffering structure, the position of the valve body corresponding plug cavity can be avoided to deform due to stress concentration, so that the reliable sealing of the cooperation between the plug and the plug cavity can be ensured, the service life of the plug valve can be significantly improved, and the valve body upper and lower ends are opened, after being loaded into plug, valve cover and bottom cover are installed at upper and lower ends, plug can be compressed, and disassembly and assembly are very convenient.

[0013] The utility model further sets up, the cross section of the overflow hole is in long circle shape, and the flow channel shape is equivalent to the overflow hole shape.

[0014] By adopting the technical scheme, not only the large flow effect can be ensured, but also medium flow is more stable, and the turbulence state of medium can be improved.

[0015] The present invention is further configured such that the inner end of the valve cover is provided with a first annular flange, the outer circular surface of the first annular flange is tightly fitted with the inner circular surface of the upper opening of the valve body, and the inner end of the bottom cover is provided with a second annular flange, the outer circular surface of the second annular flange is tightly fitted with the inner circular surface of the lower opening of the valve body.

[0016] By adopting the above technical solution, the positioning of the valve cover and valve body, as well as the positioning of the bottom cover and valve body, can be achieved, which not only facilitates the installation of the valve cover and valve body, but also ensures good installation stability.

[0017] The present invention is further configured such that an upper limit step and a lower limit step are respectively provided on the outer wall of the plug near the upper end and the lower end, the inner end of the first annular flange is limited to the upper limit step, the inner end of the second annular flange is limited to the lower limit step, and the inner circular surface of the first annular flange and the inner circular surface of the second annular flange are both in contact with the outer circular surface of the plug.

[0018] By adopting the above technical solution, after installing the valve cover and bottom cover, the positioning and installation of the cock can be achieved simultaneously, making disassembly and assembly very convenient. Attached Figure Description

[0019] Figure 1 This is a perspective view of the valve body of the plug valve in Example 1;

[0020] Figure 2 This is a cross-sectional view of the valve body of the plug valve in Example 1;

[0021] Figure 3 This embodiment 1 shows a cross-sectional view of the straight section of the tube body;

[0022] Figure 4 This is a schematic diagram of the plug valve in Example 2.

[0023] In the diagram: 1. Valve body; 2. Middle body; 3. Pipe body; 4. Flange; 5. Plug chamber; 6. Flow channel; 7. Straight cylinder section; 8. Buffer section; 10. Compensating valve; 11. Valve cover; 12. Bottom cover; 13. Valve stem; 14. Plug; 15. Bushing; 16. Flow hole; 17. First annular flange; 18. Second annular flange; 19. Upper limit step; 20. Lower limit step. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1: As shown in the attached document Figures 1-3 The valve body of the plug valve shown includes a valve body 1, which can be manufactured by casting. The valve body 1 includes a middle body 2, tubes 3 disposed at both ends of the middle body 2, and flanges 4 disposed at the outer ends of the two tubes 3. Multiple support protrusions can be provided on the outer circumferential surface of the flanges 4. The support protrusions have flat surfaces and are used to support the valve body 1 by placing them on the support surface. The middle body 2 and the tubes 3 are respectively provided with a plug cavity 5 and a flow channel 6. The plug cavity 5 has a circular cross-section and extends vertically along the valve body 1. The flow channel 6 extends horizontally along the valve body 1. The tubes 3 include a straight cylindrical part 7 and a buffer part 8 in the direction away from the middle body 2. The straight cylindrical part 7 has the same cross-section in the extension direction. The buffer part 8 has a conical shape, and the outer contour area of ​​the end of the buffer part 8 near the corresponding flange 4 is larger than the outer contour area of ​​the end away from the corresponding flange 4. The pipe 3 on the valve body 1 is configured as a straight cylinder 7 and a buffer section 8. The buffer section 8 is conical in shape. The junction of the straight cylinder 7 and the buffer section 8 is the weakest point. When the flanges 4 at both ends of the valve body 1 are under tension, the main stress on the valve body 1 is concentrated at the junction of the straight cylinder 7 and the buffer section 8. After long-term use, the valve body 1 will only undergo slight deformation at this part. The cross-section of the plug cavity 5 always remains perfectly round, which can ensure a reliable seal between the plug 14 and the plug cavity 5, greatly improving the service life of the plug valve.

[0026] As attached Figure 2 As shown, the straight cylindrical portion 7 and the buffer portion 8 of the tube body 3 have the same thickness. This design is not only easy to process, but also ensures that the junction between the straight cylindrical portion 7 and the buffer portion 8 is the weakest point, thereby achieving the buffering function.

[0027] As attached Figures 1-3 As shown, the outer wall of the straight cylindrical portion 7 of the tube body 3 is provided with multiple shrinkage ribs 10. In this embodiment, two shrinkage ribs 10 are provided on the outer wall of the straight cylindrical portion 7 of the tube body 3, respectively located on the upper and lower sides of the straight cylindrical portion 7. The shrinkage ribs 10 are protruding in shape, similar to reinforcing ribs, and are arranged in a planar manner, with one end extending to the middle body 2 and the other end extending to the buffer portion 8. This design can ensure the strength of the straight cylindrical portion 7 of the tube body 3, not only preventing deformation due to thermal expansion and contraction, but also preventing deformation of the end of the straight cylindrical portion 7 near the middle body 2 under external force.

[0028] Example 2: As shown in the attached document Figure 4The illustrated plug valve includes a valve body 1 as shown in Embodiment 1, and further includes a valve cover 11, a bottom cover 12, a valve stem 13, and a plug 14. The valve body 1 has openings at both its upper and lower ends. The valve cover 11 and the bottom cover 12 are respectively installed at the upper and lower ends of the valve body 1. Both the valve cover 11 and the bottom cover 12 can be installed on the valve body 1 by bolts or threads. The valve stem 13 passes through the valve cover 11 and extends into the plug cavity 5 to connect with the plug 14. A rectangular... The valve stem 13 has a rectangular protrusion at its lower end, which mates with the rectangular groove to achieve circumferential linkage between the valve stem 13 and the plug 14. The plug cavity 5 contains a bushing 15 that adheres to the outer wall of the plug 14 to form a sealing fit. A positioning groove can be provided on the inner wall of the plug cavity 5, and the bushing 15 is interference-fitted with the positioning groove. The fit between the bushing 15 and the valve body 1 is a conventional structure and will not be described in detail here. The plug 14 has a through-hole 16 corresponding to the flow channel 6. The plug valve uses a valve body 1 with a buffer structure, which can prevent deformation of the valve body 1 at the position corresponding to the plug cavity 5 due to stress concentration, thereby ensuring a reliable seal between the plug 14 and the plug cavity 5, significantly improving the service life of the plug valve. Furthermore, the valve body 1 is open at both the top and bottom. After the plug 14 is installed, the valve cover 11 and bottom cover 12 are installed at the top and bottom ends to press the plug 14 tightly, making assembly and disassembly very convenient.

[0029] The cross-section of the flow passage 16 is oblong, and the shape of the flow channel 6 is similar to that of the flow passage 16. This design not only ensures a large flow rate but also makes the medium flow more stable and improves the turbulence state of the medium.

[0030] As attached Figure 4 As shown, the valve cover 11 has a first annular flange 17 at its inner end, and the outer surface of the first annular flange 17 is tightly fitted with the inner surface of the upper opening of the valve body 1. The bottom cover 12 has a second annular flange 18 at its inner end, and the outer surface of the second annular flange 18 is tightly fitted with the inner surface of the lower opening of the valve body 1. Both the first annular flange 17 and the second annular flange 18 are circular. This design can realize the positioning of the valve cover 11 and the valve body 1, as well as the positioning of the bottom cover 12 and the valve body 1, which not only facilitates the installation of the valve cover 11 and the valve body 1, but also provides good installation stability.

[0031] As attached Figure 4 As shown, the outer wall of the stopcock 14 is provided with an upper limit step 19 and a lower limit step 20 near the upper and lower ends, respectively. The inner end of the first annular flange 17 is in a limiting engagement with the upper limit step 19, and the inner end of the second annular flange 18 is in a limiting engagement with the lower limit step 20. Furthermore, the inner circular surfaces of both the first annular flange 17 and the second annular flange 18 are in contact with the outer circular surface of the stopcock 14. After installing the valve cover 11 and the bottom cover 12, the stopcock 14 can be positioned and installed simultaneously, making disassembly and assembly very convenient.

Claims

1. A plug valve body, comprising a valve body (1), the valve body (1) comprising a middle body (2), pipe bodies (3) disposed at both ends of the middle body (2), and flanges (4) disposed at the outer ends of the two pipe bodies (3), wherein the middle body (2) and the pipe bodies (3) are respectively provided with a plug cavity (5) and a flow channel (6); characterized in that: The tube body (3) includes a straight section (7) and a buffer section (8) in the direction away from the middle body (2). The straight section (7) has the same cross section in the extension direction. The buffer section (8) is tapered and the outer contour area of ​​the end of the buffer section (8) near the corresponding flange (4) is larger than the outer contour area of ​​the end away from the corresponding flange (4).

2. The valve body of a plug valve according to claim 1, characterized in that: The straight section (7) and the buffer section (8) of the tube body (3) have the same thickness.

3. The valve body of a plug valve according to claim 1, characterized in that: The outer wall of the straight section (7) of the tube (3) is provided with a plurality of shrinkage tubes (10).

4. A plug valve, characterized in that: The valve body includes a plug valve body as described in any one of claims 1 to 3, and further includes a valve cover (11), a bottom cover (12), a valve stem (13), and a plug (14). The valve body (1) has openings at both the upper and lower ends. The valve cover (11) and the bottom cover (12) are respectively installed at the upper and lower ends of the valve body (1). The valve stem (13) passes through the valve cover (11) and extends into the plug cavity (5) to connect with the plug (14). The plug cavity (5) is provided with a bushing (15) that is in contact with the outer wall of the plug (14) and forms a sealing fit. The plug (14) is provided with a flow hole (16) corresponding to the flow channel (6).

5. The plug valve according to claim 4, characterized in that: The cross-section of the flow passage (16) is oblong, and the shape of the flow channel (6) is similar to that of the flow passage (16).

6. The plug valve according to claim 4, characterized in that: The valve cover (11) has a first annular flange (17) at its inner end. The outer surface of the first annular flange (17) is in close contact with the inner surface of the upper opening of the valve body (1). The bottom cover (12) has a second annular flange (18) at its inner end. The outer surface of the second annular flange (18) is in close contact with the inner surface of the lower opening of the valve body (1).

7. The plug valve according to claim 6, characterized in that: The outer wall of the stopcock (14) is provided with an upper limit step (19) and a lower limit step (20) near the upper and lower ends, respectively. The inner end of the first annular flange (17) is limited to the upper limit step (19), and the inner end of the second annular flange (18) is limited to the lower limit step (20). The inner circular surface of the first annular flange (17) and the inner circular surface of the second annular flange (18) are both in contact with the outer circular surface of the stopcock (14).

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