Plug body pressing and friction reducing device of plug valve

Abstract

The utility model provides a plug body pressing and friction reducing device of a plug valve. The cock pressing plate and the pressing ring are arranged on the outer wall of the cock body in a sleeving mode. A step is arranged on the outer wall of the cock body and located below the cock pressing plate. The two ends of the pressing ring abut against the cock pressing plate and the step respectively, and the contact face of the pressing ring and the step is of a lens ring face stress centripetal structure. The projection of the side, close to the pressing ring, of the cock pressing plate is gradually reduced in the axial direction of the cock body. A plurality of first bolt holes are uniformly formed in the circumferential direction of the cock pressing plate, and second bolt holes corresponding to the first bolt holes are formed in the valve body; and one end of each fastener penetrates through the first bolt hole and is connected to the second bolt hole, so that the cock pressing plate and the valve body are fixed. According to the embodiment of the utility model, the contact surfaces of the plug pressing ring and the plug body adopt lens ring surface stress centripetal structures, so that the plug body is always subjected to vertical downward axial force, the sealing clamping sleeve is uniformly pressed, and the stable opening and closing and reliable sealing of the valve are ensured.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a plug body compression and friction reduction device for a plug valve. Background Art

[0002] A plug valve is a rotary valve in the shape of a closing piece or a plunger. It is a valve that can be opened or closed by rotating 90 degrees so that the channel opening on the valve plug is the same as or separated from the channel opening on the valve body.

[0003] The sealing performance of the plug valve is one of its key characteristics, and it has more stringent requirements for the leakage of toxic and harmful working media. The sealing principle of the plug valve is to apply a vertical downward force to the plug body, which is transmitted from the plug body to the sealing ferrule and produces a certain amount of extrusion on it, providing a sealing specific pressure to achieve sealing.

[0004] The plug pressing plate of the existing plug valve is connected to the valve body through the clamping bolts, and the plug pressing plate presses the plug body. However, when compressing a plug body of a larger size, the plug pressing plate is prone to slipping and tilting due to uneven tightening of the clamping bolts, so that it cannot apply a vertical downward force to the plug body, and the sealing sleeve is unevenly pressed, which may cause leakage of the medium. Utility Model Content

[0005] The embodiment of the present application provides a plug body compression and friction reduction device for a plug valve, thereby solving the technical problem in the prior art that when a plug body of a larger size is compressed, the plug pressure plate is prone to slip and tilt due to uneven tightening of the compression bolts, which may cause leakage of the medium.

[0006] The embodiment of the present application provides a plug body compression and friction reduction device of a plug valve, comprising a pressure ring, a plug pressure plate and a plurality of fasteners; the plug pressure plate and the pressure ring are both sleeved on the outer wall of the plug body; the outer wall of the plug body is provided with a step, and the step is located below the plug pressure plate; the two ends of the pressure ring are respectively abutted against the plug pressure plate and the step, and the contact surfaces of the pressure ring and the step adopt a lens annular force centripetal structure; the projection of the side of the plug pressure plate close to the pressure ring along the axial direction of the plug body gradually decreases; a plurality of first bolt holes are evenly arranged on the circumference of the plug pressure plate, and the valve body is provided with second bolt holes corresponding to the first bolt holes; one end of the plurality of fasteners passes through the first bolt hole and is connected to the second bolt hole to achieve the fixation of the plug pressure plate and the valve body.

[0007] In a possible implementation, the angle between the projection of the top surface of the step on the vertical plane and the axial direction of the plug body is 60°.

[0008] In a possible implementation, the plug valve plug body compression and friction reduction device further includes a sliding bearing; a groove is provided on the side of the pressure ring away from the step; and the sliding bearing is provided between the plug pressure plate and the groove.

[0009] In a possible implementation, the groove is disposed in a middle portion of a side of the pressure ring away from the step.

[0010] In a possible implementation, the friction coefficient of the sliding bearing is 0.04-0.08.

[0011] In a possible implementation, the pressure ring and the plug pressure plate are both made of alloy steel.

[0012] In a possible implementation, there is a clearance fit between the inner wall of the pressure ring and the outer wall of the plug body.

[0013] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0014] The plug body compression and friction reduction device of the plug valve provided in the embodiment of the present application includes a pressure ring, a plug pressure plate and a plurality of fasteners. The plug pressure plate of the present application is fixed to the valve body by a plurality of fasteners, and the pressure ring and the step are compressed, so that the plug body can be compressed. The projection of the plug pressure plate along the axial direction of the plug body toward the side of the pressure ring is gradually reduced, so that the force on the plug pressure plate is better, and the bending resistance of the plug pressure plate is improved. The contact surface of the pressure ring and the step adopts a lens annular force centripetal structure, which effectively prevents the plug pressure plate from slipping and tilting due to uneven tightening of the fasteners when the large-sized plug body is compressed. The plug body compression and friction reduction device of the plug valve of the present application always provides a vertical downward axial force to the plug body, so that the sealing sleeve is evenly compressed, ensuring that the valve is opened and closed smoothly and the seal is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic structural diagram of the plug body compression and friction reduction device of the plug valve provided in an embodiment of the present application.

[0017] Icon: 1-pressure ring; 11-groove; 2-cock pressure plate; 3-fastener; 4-sliding bearing; 5-plug body; 51-step; 6-valve body. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying 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. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0020] The present application embodiment provides a plug body compression and friction reduction device for a plug valve, such as Figure 1 As shown. The plug body compression and friction reduction device of the plug valve includes a pressure ring 1, a plug pressure plate 2 and a plurality of fasteners 3. The plug pressure plate 2 and the pressure ring 1 are both sleeved on the outer wall of the plug body 5. The outer wall of the plug body 5 is provided with a step 51, and the step 51 is located below the plug pressure plate 2. Specifically, the plug body 5 and the step 51 are integrated. The two ends of the pressure ring 1 are respectively abutted against the plug pressure plate 2 and the step 51, and the contact surfaces of the pressure ring 1 and the step 51 adopt a lens annular force centripetal structure, which is equivalent to the side of the pressure ring 1 facing the step 51 being a concave lens, and the side of the step 51 facing the pressure ring 1 being a convex lens.

[0021] The projection of the side of the plug pressing plate 2 close to the pressure ring 1 along the axial direction of the plug body 5 gradually decreases.

[0022] Specifically, the projection area of ​​the bottom of the plug pressing plate 2 on the horizontal plane is larger than the projection area of ​​the pressing ring 1 on the horizontal plane.

[0023] A plurality of first bolt holes are evenly arranged around the circumference of the plug pressing plate 2, and a second bolt hole corresponding to the first bolt hole is arranged on the valve body 6. One end of a plurality of fasteners 3 passes through the first bolt hole and is connected to the second bolt hole to achieve the fixing of the plug pressing plate 2 and the valve body 6.

[0024] It should be noted that the plug pressure plate 2 of the present application is fixed to the valve body 6 by a plurality of fasteners 3, and the pressure ring 1 and the step 51 are compressed, so that the plug body 5 can be compressed. The projection of the plug pressure plate 2 along the axial direction of the plug body 5 on the side facing the pressure ring 1 is gradually reduced, so that the force on the plug pressure plate 2 is better, and the bending resistance of the plug pressure plate 2 is improved. The contact surface of the pressure ring 1 and the step 51 adopts a lens annular force centripetal structure, which effectively prevents the plug pressure plate 2 from slipping and tilting due to uneven tightening of the fasteners 3 when the larger-sized plug body 5 is compressed. The plug valve plug body compression and friction reduction device of the present application always provides a vertical downward axial force to the plug body 5, so that the sealing sleeve is evenly compressed, ensuring the smooth opening and closing of the valve and reliable sealing.

[0025] In the embodiment of the present application, the angle between the projection of the top surface of the step 51 on the vertical plane and the axial direction of the plug body 5 is 60°.

[0026] It should be noted that when the fastener 3 is compressed, the plug body 5 is subjected to a downward force which always coincides with the axis of the plug body 5 , so that the sealing sleeve is evenly pressurized and has better sealing performance.

[0027] In the embodiment of the present application, the plug body compression and friction reduction device of the plug valve further includes a sliding bearing 4. A groove 11 is provided on the side of the pressure ring 1 away from the step 51. The sliding bearing 4 is provided between the plug pressure plate 2 and the groove 11.

[0028] It should be noted that by placing the sliding bearing 4 in the groove 11, the relative movement between the plug plate 2 and the sliding bearing 4 can be ensured when the plug body 5 rotates, thereby reducing the friction of the rotation of the plug body 5 and further reducing the opening and closing torque of the valve.

[0029] In the embodiment of the present application, the groove 11 is arranged in the middle of the side of the pressure ring 1 away from the step 51 .

[0030] In the embodiment of the present application, the friction coefficient of the sliding bearing 4 is 0.04-0.08. The friction coefficient of the sliding bearing 4 in the embodiment of the present application is small, which can reduce the wear inside the sliding bearing 4 and extend its service life.

[0031] In the embodiment of the present application, the materials of the pressure ring 1 and the plug pressure plate 2 are both alloy steel.

[0032] It should be noted that alloy steel has the characteristics of good bending resistance and high strength.

[0033] In the embodiment of the present application, there is a clearance fit between the inner wall of the pressure ring 1 and the outer wall of the plug body 5 .

[0034] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0035] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A plug body compression and friction reduction device for a plug valve, characterized in that: It comprises a pressure ring (1), a plug pressure plate (2) and a plurality of fasteners (3); The plug pressing plate (2) and the pressing ring (1) are both sleeved on the outer wall of the plug body (5); The outer wall of the plug body (5) is provided with a step (51), and the step (51) is located below the plug pressing plate (2); The two ends of the pressure ring (1) are respectively in contact with the plug pressure plate (2) and the step (51), and the contact surfaces of the pressure ring (1) and the step (51) both adopt a lens annular force-bearing centripetal structure; The projection of the side of the plug pressing plate (2) close to the pressing ring (1) along the axial direction of the plug body (5) gradually decreases; A plurality of first bolt holes are evenly arranged in the circumference of the plug pressing plate (2), and the valve body (6) is provided with second bolt holes corresponding to the first bolt holes; One end of the plurality of fasteners (3) passes through the first bolt hole and is connected to the second bolt hole, so as to achieve the fixation of the plug pressure plate (2) and the valve body (6); The included angle between the projection of the top surface of the step (51) on the vertical plane and the axial direction of the plug body (5) is 60°; Also includes a sliding bearing (4); A groove (11) is provided on a side of the pressure ring (1) away from the step (51); The sliding bearing (4) is arranged between the plug pressure plate (2) and the groove (11).

2. The plug body compression and friction reduction device of the plug valve according to claim 1, characterized in that: The groove (11) is arranged in the middle of a side of the pressure ring (1) away from the step (51).

3. The plug body compression and friction reduction device of the plug valve according to claim 1, characterized in that: The friction coefficient of the sliding bearing (4) is 0.04-0.

08.

4. The plug body compression and friction reduction device of a plug valve according to claim 1, characterized in that: The material of the pressure ring (1) and the plug pressure plate (2) are both alloy steel.

5. The plug body compression and friction reduction device of a plug valve according to claim 1, characterized in that: There is a clearance fit between the inner wall of the pressure ring (1) and the outer wall of the plug body (5).

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