Wear-resistant butterfly valve

Abstract

The application discloses a kind of anti-abrasion butterfly valves, including valve body, top plate, top plate mechanism and valve stem;Valve body is circular pipe, top plate can be sealed circular pipe in one end of circular pipe, and the diameter of the inner wall of circular pipe at the sealing place of top plate and valve body is less than the diameter of the inner wall of circular pipe at other places;Top plate mechanism includes bottom plate, first elastic member, center shaft assembly, upper plate and rear cover;Valve stem includes top core sleeve and groove;Top core sleeve and groove are distributed on the surface of valve stem two sides with axis symmetry;Top core sleeve can be consistent with the top core on center shaft assembly;Cover core shaft can be consistent with the cover core shaft on rear cover.This butterfly valve is based on the principle of "first rotation then top", always avoid extrusion and relative friction of sealing surface in opening and closing process, this design significantly prolongs the service life of valve, reduces the leakage problem caused by sealing surface abrasion, so as to guarantee the safety of operating condition, reduce valve replacement frequency and maintenance cost, improve the stability and reliability of equipment operation.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a butterfly valve. Background Technology

[0002] In industrial fluid control systems, hard-seal butterfly valves are widely used in key fields such as petroleum, chemical, and power industries due to their high temperature resistance, high pressure resistance, and corrosion resistance. Their operational reliability is crucial to the safety of the entire operating system. Currently, all hard-seal butterfly valves in China mainly adopt a compression sealing structure. This structure achieves sealing through forced compression between the valve seat and the butterfly plate. In its factory condition, thanks to precise machining and assembly processes, it can achieve an ideal sealing effect with zero leakage, meeting the stringent requirements of initial use. However, once the valve is put into actual operation, its sealing performance gradually declines with the increase in the number of opening and closing operations. During each opening and closing process, the sealing surface is constantly under pressure and generates relative friction, which leads to continuous wear of the sealing material. When the valve is operated a certain number of times, the wear of the sealing material will exceed its service life limit, the integrity of the sealing surface will be compromised, and media leakage will occur. Leaks not only waste media and pollute the environment, but also force system shutdowns for valve replacement, significantly increasing equipment maintenance costs and production interruption losses. More seriously, leaks can trigger fires, explosions, and other safety accidents, posing a severe threat to the lives of operators and production facilities, and severely hindering the stable and efficient operation of the system. Therefore, existing hard-seal butterfly valves with compression sealing structures suffer from insurmountable lifespan limitations and safety hazards in practical applications, necessitating a novel sealing structure design that can address these issues. Summary of the Invention

[0003] The purpose of this invention is to provide an anti-wear butterfly valve to solve the technical problems existing in the background art.

[0004] The technical solution adopted in this invention is as follows: A wear-resistant butterfly valve includes a valve body, a top plate, a top plate assembly mechanism, and a valve stem; The valve body is in the shape of a round tube. The top plate can seal the round tube at one end, and the inner diameter of the round tube at the sealing point between the top plate and the valve body is smaller than the inner diameter of the round tube at other points. The top plate assembly includes a bottom plate, a first elastic element, a central shaft assembly, an upper plate, and a rear support cover. The base plate, the first elastic element, and the central shaft assembly are sequentially installed in the groove at the center of the top plate; the portion of the base plate extending beyond the outer edge of the central shaft assembly is bolted to the upper plate and installed on the top plate; the rear cover is installed on the side of the central shaft assembly away from the top plate along its axial direction, and is combined with the upper plate to form a frame for mounting the valve stem; The valve stem includes a top core sleeve and a support groove; the top core sleeve and the support groove are symmetrically distributed on both sides of the surface of the valve stem. The top core sleeve can be matched with the top core on the central shaft assembly; the cover mandrel can be matched with the cover mandrel on the rear cover.

[0005] More preferably, the above-mentioned central shaft assembly further includes a central shaft, the bottom of which contacts the first elastic member, and the top of which is connected to the top core through a second elastic member.

[0006] More preferably, the top core and the top core sleeve have a stroke of 2-3 mm between their mating and dismounting states; the difference between the inner wall diameter of the round tube at the sealing point between the top plate and the valve body and the inner wall diameter at other points of the round tube matches the 2-3 mm stroke.

[0007] In a further preferred embodiment, the valve stem rotates counterclockwise by 10° to cause the top core sleeve to engage with the top core; the valve stem rotates counterclockwise by 10° to cause the lower opening of the bracket groove to contact the bracket spindle on the rear bracket cover.

[0008] More preferably, the portion of the valve body that contacts the top plate for sealing has a first alloy portion made of Stellite 6 alloy material; and the portion of the top plate that contacts the valve body for sealing has a second alloy portion made of Stellite 12 alloy material.

[0009] More preferably, the second alloy portion on the top plate is made of spherical hard alloy material; and the first alloy portion on the valve body is a strip with an R0.5 radius.

[0010] Preferably, both the top core and the top core sleeve are made of cemented carbide.

[0011] More preferably, the portion of the valve body that contacts the top plate for sealing has a limiting block.

[0012] In a further preferred embodiment, the valve stem extends through the valve body, and a dustproof cone sleeve and a bearing are sequentially fitted onto the valve stem along the axial direction at the portion of the valve stem that extends through the valve body.

[0013] In a further preferred embodiment, after the bearing is fitted, a split ring is also fitted at one end of the valve stem along the axial direction.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention improves upon the conventional butterfly valve's combination of a butterfly plate and valve stem by replacing the butterfly plate with a top plate, on which a central shaft assembly is installed to cooperate with the valve stem. When the valve is closed, the rotation of the valve stem causes the central shaft assembly to first rotate the top plate to the valve body sealing position, and then drive the top plate to push against the valve body sealing position to achieve a seal. When opening, the rotation of the valve stem causes the top core sleeve on the valve stem to engage with the top core of the central shaft assembly. When the top core sleeve engages with the top core, a relative push-off occurs with a 2-3mm stroke. Because the central shaft assembly is connected to the top plate, the STL12 on the top plate and the STL6 on the valve body disengage by 2-3mm. At this point, the lower opening of the groove on the back of the valve stem contacts the support mandrel of the rear cover. Continued rotation of the valve stem opens the valve. The butterfly valve in this invention is based on the principle of "rotate first, then push," which avoids compression and relative friction on the sealing surface during the opening and closing process. This design significantly extends the service life of the valve, reduces leakage problems caused by wear of the sealing surface, thereby ensuring absolute safety in operation, reducing valve replacement frequency and maintenance costs, and improving the stability and reliability of equipment operation. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the butterfly valve in Example 1; Figure 2 This is a schematic diagram of the valve body and valve stem installation structure of the butterfly valve in Example 1; Figure 3 This is a schematic diagram of the installation structure of the valve stem and rear cover of the butterfly valve in Example 1.

[0016] The numbers on the map are: 1. Valve body; 11. First alloy part; 12. Limiting block; 2. Top plate; 21. Second alloy part; 3. Top plate assembly; 31. Base plate; 32. First elastic element; 33. Central shaft assembly; 331. Top core; 332. Central shaft; 34. Upper plate; 35. Rear cover; 351. Cover spindle; 36. Second elastic element; 4. Valve stem; 41. Top core sleeve; 42. Support groove; 5. Dustproof cone sleeve; 6. Bearing; 7. Split ring. Detailed Implementation

[0017] To facilitate understanding of the present invention, specific embodiments are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit its scope.

[0018] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0019] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0020] Example 1: A wear-resistant butterfly valve, such as Figure 1-3 As shown, it includes valve body 1, top plate 2, top plate assembly 3, and valve stem 4; The valve body 1 is in the shape of a round tube. The top plate 2 can seal the round tube at one end. The inner diameter of the round tube at the sealing point between the top plate 2 and the valve body 1 is smaller than the inner diameter of the round tube at other points. The top plate assembly 3 includes a bottom plate 31, a first elastic element 32, a central shaft assembly 33, an upper plate 34, and a rear support cover 35; The base plate 31, the first elastic element 32, and the central shaft assembly 33 are sequentially installed in the groove at the center of the top plate 2; the portion of the base plate 31 extending beyond the outer edge of the central shaft assembly 33 is bolted to the upper plate 34 and installed on the top plate 2; the rear cover 35 is installed on the side of the central shaft assembly 33 away from the top plate 2 along its axial direction, and is combined with the upper plate 34 to form a frame for mounting the valve stem 4; The valve stem 4 includes a top core sleeve 41 and a support groove 42; the top core sleeve 41 and the support groove 42 are symmetrically distributed on both sides of the surface of the valve stem 4. The top core sleeve 41 can be matched with the top core 331 on the central shaft assembly 33; the cover spindle 42 can be matched with the cover spindle 351 on the rear cover 35.

[0021] The working principle of the wear-resistant butterfly valve in this invention is as follows: Valve opening operation: Rotate valve stem 4. When valve stem 4 rotates counterclockwise by 10°, top core sleeve 41 and top core 331 are engaged. Before top core sleeve 41 and top core 331 are engaged, the first elastic member 32 connected to top core 331 is in a compressed state due to the pushing action of valve stem 4 column wall. There is a 2-3mm stroke between the engaged state and the pushing state of top core 331 and top core sleeve 41. Therefore, when top core sleeve 41 and top core 331 are engaged, the butterfly spring of the first elastic member 32 releases pressure, causing the bottom plate 31 connected to the other end of the butterfly spring to drive the top plate 2 to move, causing STL12 on top plate 2 and STL6 on valve body to separate by 2-3mm. At this time, the lower opening of the groove 42 on the back of the valve stem 4 contacts the cover spindle 351 of the rear cover 35. As the valve stem 4 continues to rotate, the groove 42 on the valve stem 4 drives the upper plate 34 connected to it to rotate under force. The upper plate 34 transmits the force to the top plate 2, thereby opening the valve.

[0022] Valve closing operation: Rotating the valve stem 4 causes the transmission top plate assembly 3 to first drive the top plate 2 to rotate to the sealing position of the valve body 1. Then, the valve stem 4 is rotated again, causing the top core sleeve 41 and the top core 331 to separate. The butterfly spring on the first elastic member 32 is compressed and the force is transmitted to the bottom plate 31 and the top plate 2, so that the top plate 2 is pushed towards the sealing position of the valve body 1, thereby achieving a seal.

[0023] In this embodiment, the frame formed by the bracket 42 and the upper plate 34 is detachably connected. This detachable connection facilitates the inspection and replacement of components in the central shaft assembly 3.

[0024] In this embodiment, the central shaft assembly 33 further includes a central shaft 332. The bottom of the central shaft 332 contacts the first elastic member 32, and the top is connected to the top core 331 through a second elastic member 36. The second elastic member 36 is also a disc spring mounted between the central shaft 332 and the top core 331, mainly serving as a preload to compensate for wear on the top core 331.

[0025] In this embodiment, the top core 331 and the top core sleeve 41 have a 2-3 mm stroke between their mating and disengaging states; the difference between the inner diameter of the round tube at the sealing point between the top plate 2 and the valve body 1 and the inner diameter of the round tube at other locations matches the 2-3 mm stroke. By limiting the stroke between the mating and disengaging states of the top core 331 and the top core sleeve 41 to 2-3 mm, a gap is left between the top plate 2 and the valve body 1 to facilitate the rotation of the top plate 2, while avoiding excessive stroke that could affect the assembly stability of the central shaft assembly 33.

[0026] In this embodiment, the valve stem 4 rotates counterclockwise by 10° to make the top core sleeve 41 and the top core 331 fit together; the valve stem 4 rotates counterclockwise by 10° to make the lower opening of the support groove 42 contact the support mandrel 351 on the rear support cover 35. The fitting area between the top core sleeve 41 and the top core 331 is designed to be completed by rotating the valve stem 4 counterclockwise by 10°, so that the slots of the top core sleeve 41 and the support cover 35 do not need to be too large, avoiding an excessively large diameter of the valve stem 4 and an excessively large size of the rear support cover 35, thereby indirectly controlling the size of the central shaft assembly 33 and avoiding an increase in manufacturing costs due to excessive size.

[0027] In this embodiment, the portion of the valve body 1 that contacts the top plate 2 for sealing has a first alloy portion 11 made of Stellite 6 alloy material; the portion of the top plate 2 that contacts the valve body 1 for sealing has a second alloy portion 21 made of Stellite 12 alloy material.

[0028] In this embodiment, the second alloy part 21 on the top plate 2 is made of spherical hard alloy material; the first alloy part 11 on the valve body 1 is an R0.5 strip. The STL12 sealing surface on the top plate is made of spherical hard alloy, and the STL6 on the valve body is an R0.5 strip, ensuring that the valve always has a line-surface contact seal, suitable for dusty media, and has a shearing function.

[0029] In this embodiment, both the top core 331 and the top core sleeve 41 are made of cemented carbide.

[0030] In this embodiment, the valve body 1 has a limiting block 12 at the part that contacts the top plate 2 for sealing. The limiting block 12 can provide a limiting function for the top plate 2, further ensuring the stability of the top plate after it is sealed in place.

[0031] In this embodiment, the valve stem 4 passes through the valve body 1, and a dustproof cone sleeve 5 and a bearing 6 are sequentially fitted along the axial direction at the part of the valve stem 4 that passes through the valve body 1. The dustproof cone sleeve 5 mainly serves to prevent dust from entering the front section of the bearing 6.

[0032] In this embodiment, after the bearing 6 is installed, a split ring 7 is also fitted along the axial direction at one end of the valve stem 4. The split ring 7 mainly serves to position the valve stem 4 and prevent the valve stem 4 from moving.

[0033] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A wear-resistant butterfly valve, characterized in that, It includes a valve body (1), a top plate (2), a top plate assembly (3), and a valve stem (4); The valve body (1) is a round tube, and the top plate (2) can seal the round tube at one end. The inner diameter of the round tube at the sealing point between the top plate (2) and the valve body (1) is smaller than the inner diameter of the round tube at other points. The top plate assembly (3) includes a bottom plate (31), a first elastic element (32), a central shaft assembly (33), an upper plate (34), and a rear cover (35). The base plate (31), the first elastic element (32), and the central shaft assembly (33) are sequentially installed in the groove at the center of the top plate (2); the portion of the base plate (31) extending out of the outer edge of the central shaft assembly (33) is bolted to the upper plate (34) and installed on the top plate (2); the rear cover (35) is installed on the side of the central shaft assembly (33) away from the top plate (2) along the axial direction, and is combined with the upper plate (34) to form a frame for mounting the valve stem (4). The valve stem (4) includes a top core sleeve (41) and a bracket (42); the top core sleeve (41) and the bracket (42) are axially symmetrically distributed on both sides of the surface of the valve stem (4); The top core sleeve (41) can be matched with the top core (331) on the central shaft assembly (33); the cover mandrel (42) can be matched with the cover mandrel (351) on the rear cover (35).

2. The butterfly valve according to claim 1, characterized in that, The central shaft assembly (33) also includes a central shaft (332), the bottom of which is in contact with the first elastic member (32), and the top is connected to the top core (331) through the second elastic member (36).

3. The butterfly valve according to claim 2, characterized in that, The top core (331) and the top core sleeve (41) have a 2-3 mm stroke between their mating and dismounting states; the difference between the inner wall diameter of the round tube at the sealing point between the top plate (2) and the valve body (1) and the inner wall diameter at other points of the round tube matches the 2-3 mm stroke.

4. The butterfly valve according to claim 3, characterized in that, The valve stem (4) rotates counterclockwise by 10° to make the top core sleeve (41) fit with the top core (331); the valve stem (4) rotates counterclockwise by 10° to make the lower opening of the bracket (42) contact the bracket spindle (351) on the rear bracket (35).

5. The butterfly valve according to claim 4, characterized in that, The valve body (1) has a first alloy part (11) made of Stellite 6 alloy material in the part that contacts the top plate (2) for sealing; the top plate (2) has a second alloy part (21) made of Stellite 12 alloy material in the part that contacts the valve body (1) for sealing.

6. The butterfly valve according to claim 5, characterized in that, The second alloy part on the top plate (2) is made of spherical hard alloy material; the first alloy part (11) on the valve body (1) is a wire strip with R0.

5.

7. The butterfly valve according to claim 6, characterized in that, Both the top core (331) and the top core sleeve (41) are made of hard alloy.

8. The butterfly valve according to claim 7, characterized in that, The valve body (1) has a limiting block (12) in the part that contacts the top plate (2) for sealing.

9. The butterfly valve according to claim 8, characterized in that, The valve stem (4) passes through the valve body (1), and a dustproof cone sleeve (5) and a bearing (6) are sequentially fitted along the axial direction at the part of the valve stem (4) that passes through the valve body (1).

10. The butterfly valve according to claim 9, characterized in that, One end of the valve stem (4) is fitted with a split ring (7) along the axial direction after the bearing (6) is fitted.

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