Elastic bidirectional metal hard sealing butterfly valve

Abstract

This invention discloses a resilient bidirectional metal hard-seal butterfly valve, relating to the field of butterfly valves, and solving the problem of insufficient sealing performance in high-pressure media environments. The valve seat assembly includes a first resilient sealing ring and a second resilient sealing ring. Both the first and second resilient sealing rings have a "J"-shaped cross-section and include a floating portion and an elastic portion, the elastic portion being arc-shaped. The floating portions of the first and second resilient sealing rings are tightly fitted together, and their elastic portions extend in opposite directions and respectively seal against the butterfly plate. By utilizing the elastic energy storage and bidirectional extension of the resilient sealing rings, a sealed fit is maintained with the butterfly plate sealing surface at all times, improving both forward and reverse sealing performance. This is sufficient for high-pressure media environments and prevents excessive hard sealing from causing wear on the sealing surface, solving the sealing problem that occurs during bidirectional impact of the media on the butterfly plate.

Description

Technical Field

[0001] This invention relates to the field of butterfly valves, and in particular to a resilient bidirectional metal hard-seal butterfly valve. Background Technology

[0002] Butterfly valves are characterized by their simple structure, convenient opening and closing, and low manufacturing cost, and are widely used in media transportation pipeline systems across various sectors of the national economy. Conventional butterfly valves, due to their inherent structure, can only provide forward pressure sealing. The later-developed floating-seat bidirectional pressure-bearing butterfly valve overcomes this limitation in reverse pressure sealing. Existing technology discloses a Chinese utility model patent: CN207178717U, which describes a novel triple-eccentric bidirectional metal-sealed butterfly valve. A floating valve seat is sandwiched between a positioning protrusion and a limiting sleeve. The floating valve seat has a circular structure and is made of elastic metal. Its cross-section is J-shaped. The floating valve seat includes a floating part and an elastic part that cooperates with the butterfly plate. The elastic part and the floating part are an integral structure, and the elastic part has an arc-shaped structure. This structure improves both forward and reverse sealing performance, with the elastic part compensating for the sealing performance. However, in high-pressure media environments, a floating valve seat with a unidirectional extended "J"-shaped structure is insufficient to ensure sealing performance. Especially when the media impact force is large, the floating valve seat may break through the elasticity of the elastic part under the force of the media, causing leakage and affecting the sealing performance under high-pressure environments. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art by providing a resilient bidirectional metal hard-seal butterfly valve that solves the problem of insufficient sealing in high-pressure media environments.

[0004] The technical solution of the present invention includes a butterfly plate, a valve seat assembly, a valve stem, and a valve body. A pressure ring is installed in the valve body. The valve seat assembly includes a first elastic sealing ring and a second elastic sealing ring. The cross-sections of the first elastic sealing ring and the second elastic sealing ring are both "J" shaped. Both the first elastic sealing ring and the second elastic sealing ring include a floating part and an elastic part. The elastic part is arc-shaped. The floating parts of the first elastic sealing ring and the second elastic sealing ring are closely fitted together, and the elastic parts of the two extend in opposite directions and respectively seal with the butterfly plate.

[0005] Using the above technical solution, the overall cross-section of the valve seat assembly is Y-shaped, with the two elastic parts sealing with the butterfly plate in opposite directions. The elastic sealing ring also provides elastic sealing compensation for the sealing surface. By utilizing the elastic energy storage and bidirectional extension of the elastic sealing ring, it always maintains a sealed fit with the butterfly plate sealing surface, improving both forward and reverse sealing performance. This is sufficient for high-pressure media environments and also prevents excessive hard sealing from causing wear on the sealing surface, thus solving the sealing problem that exists when the medium impacts the butterfly plate in both directions.

[0006] In one possible design, the butterfly plate is provided with a fixed sealing layer and a third elastic sealing ring. The fixed sealing layer is sealed with the first elastic sealing ring, and the third elastic sealing ring is sealed with the second elastic sealing ring.

[0007] With the above design, the sealing surface formed by the fixed sealing layer has a more rigid sealing capability, and the sealing surface formed by the third elastic sealing ring has a more elastic compensation capability. The combination of the two complements each other, which can cope with complex high-pressure media environments, improve adaptability, and make the sealing performance more reliable.

[0008] In one possible design, several sliding plates are slidably arranged on the butterfly plate. The top surface of the sliding plate is inclined to the axial direction of the valve body, and its inclination direction is inclined from the center of the butterfly plate to the direction away from the valve stem. The outer wall of the sliding plate in the sliding direction is pressed against the inner circle of the third elastic sealing ring.

[0009] With the above design, the sliding plate slides outward or applies pressure to the third elastic sealing ring under the impact of high pressure medium, so that the contact between the third elastic sealing ring and the second elastic sealing ring is tighter, thereby enhancing the sealing performance. As the medium pressure increases, the leakage can be reduced, avoiding leakage caused by the medium impact force breaking through the elastic sealing ring.

[0010] In one possible design, the sliding plate is fan-shaped, and the individual sliding plates are assembled to form a whole circle, with movable gaps between adjacent sliding plates; a limit pin is detachably installed at the center of the butterfly plate, and the outer wall of the limit pin is set to abut against the sliding plate.

[0011] The above design provides sliding space for the sliding plate through the activity gap. The design is reasonable. After the sliding plate is installed on the butterfly plate, it is limited by the limiting pin to prevent the sliding plate from falling off the butterfly plate.

[0012] In one possible design, a compression spring is installed within the movement gap, with its two ends abutting against two adjacent sliding plates.

[0013] With the above design, the compression spring provides the preload force for the sliding plate to slide outward, so that the sliding plate has a certain preload force to press tightly against the third elastic sealing ring. It is easy to assemble, and the preload force can be adjusted by changing the spring force of the compression spring to improve the applicability.

[0014] In one possible design, the contact surface between the butterfly plate and the sliding plate is inclined to the axial direction of the valve body, and the contact surface is centrally raised.

[0015] With the above design, the sliding plate has a tendency to slide outward, thereby providing a certain preload, and the sliding plate is more likely to slide outward when subjected to force.

[0016] In one possible design, a T-shaped guide rail is fixed on the butterfly plate, the guide rail is arranged in the radial direction of the butterfly plate, and a track groove adapted to the guide rail is opened on the sliding plate.

[0017] By adopting the above design and pre-setting the sliding direction of the sliding plate, the force on the third elastic sealing ring is more balanced.

[0018] In one possible design, the cross-section of the third elastic sealing ring is "C" shaped, which includes an outer arc portion and an inner arc portion. The outer arc portion is sealed and fitted with the second elastic sealing ring. An annular groove is provided on the outer wall of the sliding plate, and the inner arc portion is placed in the annular groove.

[0019] With the above design, the third elastic sealing ring can provide greater elasticity on the outer arc portion, improving the elastic sealing effect; the position of the third elastic sealing ring is fixed by the ring groove to prevent it from detaching under force.

[0020] In one possible design, elastic pads are installed on both sides of the valve seat assembly in the axial direction, and an annular boss is integrally provided in the valve body. One elastic pad is installed between the annular boss and the first elastic sealing ring, and the other elastic pad is installed between the second elastic sealing ring and the pressure ring.

[0021] With the above design, the valve seat assembly has a suitable range of elastic floating.

[0022] In one possible design, the pressure ring is provided with a top inclined platform, which abuts against the outer peripheral wall of the valve seat assembly, and the contact surfaces of the two are staggered by inclined surfaces.

[0023] By adopting the above design, adjusting the position of the pressure ring can adjust the degree of inward retraction of the valve seat assembly, thus serving as a pre-adjustment function for the valve seat assembly. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a specific embodiment of the present invention;

[0025] Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle;

[0026] Figure 3 This is a schematic diagram of the external structure of the butterfly plate of the present invention;

[0027] Figure 4 This is a cross-sectional schematic diagram of the butterfly plate of the present invention;

[0028] Figure 5 This is an exploded view of a specific embodiment of the present invention;

[0029] Among them, 1. butterfly plate; 2. valve seat assembly; 3. valve stem; 4. valve body; 5. pressure ring; 21. first elastic sealing ring; 22. second elastic sealing ring; 211. floating part; 212. elastic part; 11. fixed sealing layer; 12. third elastic sealing ring; 13. sliding plate; 131. movement clearance; 132. compression spring; 14. guide rail; 133. track groove; 134. ring groove; 15. limiting pin; 121. outer arc part; 122. inner arc part; 23. elastic pad; 41. ring boss; 51. top inclined platform. Implementation

[0030] like Figure 1 , Figure 2 The illustrated resilient bidirectional metal hard-seal butterfly valve includes a butterfly plate 1, a valve seat assembly 2, a valve stem 3, and a valve body 4. A pressure ring 5 is installed inside the valve body 4. The valve seat assembly 2 includes a first resilient sealing ring 21 and a second resilient sealing ring 22. The cross-sections of the first resilient sealing ring 21 and the second resilient sealing ring 22 are both "J" shaped. Both the first resilient sealing ring 21 and the second resilient sealing ring 22 include a floating part 211 and an elastic part 212. The elastic part 212 is arc-shaped, and the floating part 211 is straight. The floating parts 211 of the first resilient sealing ring 21 and the second resilient sealing ring 22 are closely fitted together, and the elastic parts 212 of the two extend in opposite directions and respectively seal with the butterfly plate 1. That is, the extension direction of the elastic part 212 of the first resilient sealing ring 21 is towards the valve stem 3, and the extension direction of the elastic part 212 of the second resilient sealing ring 22 is towards the side away from the valve stem 3. The valve seat assembly 2 of the first elastic sealing ring 21 and the second elastic sealing ring 22 has an overall cross-section of "Y". The tops of the elastic parts 212 of the two are sealed with the butterfly plate 1 at different positions and in different directions. The floating parts 211 of the two are in close contact to provide a good support point, thereby enhancing the elastic sealing compensation capability and compensating for the positive and reverse pressure sealing performance.

[0031] like Figure 2 As shown, the butterfly plate 1 is provided with a fixed sealing layer 11 and a third elastic sealing ring 12. The fixed sealing layer 11 is sealed and cooperates with the first elastic sealing ring 21, and the sealing surface formed by the two has a more rigid sealing ability. The third elastic sealing ring 12 is sealed and cooperates with the second elastic sealing ring 22, and the sealing surface formed by the two has a more elastic compensation ability. The two sealing surfaces are combined and complementary, making the sealing effect more reliable.

[0032] like Figure 2-5As shown, several sliding plates 13 are slidably disposed on the butterfly plate 1. The force-bearing top surface of the sliding plate 13 is inclined to the axial direction of the valve body 4, and its inclination direction is inclined from the center of the butterfly plate 1 towards the direction away from the valve stem 3. Overall, the force-bearing top surface of the sliding plate 13 has an inwardly concave shape, and the outer wall of the sliding plate 13 in the sliding direction is pressed against the inner circle of the third elastic sealing ring 12. When the sliding plate 13 is impacted by the medium, the pressure can be decomposed into the outward sliding force of the sliding plate 13 due to the inclination of the force-bearing top surface of the sliding plate 13. This causes the sliding plate 13 to press on the third elastic sealing ring 12, giving the third elastic sealing ring 12 an outward expansion force, which improves the sealing effect with the second elastic sealing ring 22. Even when encountering high-pressure medium impact, the outward movement force of the sliding plate 13 is greater, and the outward expansion force of the third elastic sealing ring 12 also increases accordingly, resulting in a better sealing effect.

[0033] The sliding plate 13 can be four pieces, each fan-shaped, which are assembled to form a complete circle. A movable gap 131 is provided between adjacent sliding plates 13 to provide sliding space. A limiting pin 15 is detachably installed at the center of the butterfly plate 1. The outer wall of the limiting pin 15 abuts against the sliding plate 13. After the sliding plate 13 is slidably installed on the butterfly plate 1, the limiting pin 15 is used to limit its movement to prevent it from sliding back and detaching from the butterfly plate 1. A compression spring 132 is provided within the movable gap 131, with its two ends abutting against two adjacent sliding plates 13. The compression spring 132 provides a preload force for the sliding plate 13 to slide outward, ensuring that the sliding plate 13 is tightly pressed against the third elastic sealing ring 12 during valve installation. Furthermore, the preload force can be adjusted by changing the spring force of the compression spring 132 to improve its applicability.

[0034] The contact surface between the butterfly plate 1 and the sliding plate 13 is inclined to the axial direction of the valve body 4, and the contact surface is slightly raised from the center outward. The sliding plate 13 initially has the tendency to move outward, and it is easier to slide outward when subjected to force.

[0035] A T-shaped guide rail 14 is fixed on the butterfly plate 1. The guide rail 14 is arranged in the radial direction of the butterfly plate 1. A track groove 133 adapted to the guide rail 14 is provided on the sliding plate 13. Under the guidance of the T-shaped guide rail 14, the sliding plate 13 can only slide along the radial direction of the butterfly plate 1.

[0036] The third elastic sealing ring 12 has a C-shaped cross-section, comprising an outer arc portion 121 and an inner arc portion 122. The outer arc portion 121 seals against the second elastic sealing ring 22. An annular groove 134 is formed on the outer wall of the sliding plate 13, and the inner arc portion 122 is placed within the annular groove 134. The third elastic sealing ring 12 provides greater elasticity to the outer arc portion 121 under stress, improving the elastic sealing effect. The annular groove 134 fixes the position of the third elastic sealing ring 12, preventing it from detaching under stress. The butterfly valve can be a triple-eccentric butterfly valve, where the sealing surface experiences less stress and wear during the rotation and opening of the butterfly plate 1.

[0037] Elastic pads 23 are installed on both sides of the valve seat assembly 2 in the axial direction. An annular boss 41 is integrally formed inside the valve body 4. One elastic pad 23 is installed between the annular boss 41 and the first elastic sealing ring 21, and the other elastic pad 23 is installed between the second elastic sealing ring 22 and the pressure ring 5. Under the action of the elastic pads 23, adjusting the position of the pressure ring 5 allows the valve seat assembly 2 to float elastically along its axial direction. Therefore, according to the position of the pressure ring 5, the valve seat can be selected at a suitable pre-adjusted position to achieve a pre-adjusted sealing effect with the butterfly plate 1.

[0038] The pressure ring 5 is provided with a top inclined platform 51, which abuts against the outer peripheral wall of the valve seat assembly 2, and the contact surfaces of the two are staggered by inclined surfaces. When the pressure ring 5 is fed inward for adjustment, the top inclined platform 51 presses against the outer peripheral wall of the valve seat assembly 2, and the first elastic sealing ring 21 and the second elastic sealing ring 22 are forced to contract inward, thus fitting more tightly against the fixed sealing layer 11 and the third elastic sealing ring 12.

Claims

1. A resilient bidirectional metal hard-seal butterfly valve, comprising a butterfly plate, a valve seat assembly, a valve stem, and a valve body, wherein a pressure ring is installed within the valve body, characterized in that: The valve seat assembly includes a first elastic sealing ring and a second elastic sealing ring. The cross-sections of the first and second elastic sealing rings are both "J" shaped. Both the first and second elastic sealing rings include a floating part and an elastic part. The elastic part is arc-shaped. The floating parts of the first and second elastic sealing rings are closely fitted together, and their elastic parts extend in opposite directions and respectively seal with the butterfly plate. The butterfly plate is provided with a fixed sealing layer and a third elastic sealing ring. The fixed sealing layer is sealed with the first elastic sealing ring, and the third elastic sealing ring is sealed with the second elastic sealing ring. The butterfly plate is provided with several sliding plates. The top surface of the sliding plate is inclined to the axial direction of the valve body, and its inclination direction is inclined from the center of the butterfly plate to the direction away from the valve stem. The outer wall of the sliding plate in the sliding direction is pressed against the inner circle of the third elastic sealing ring. Elastic pads are installed on both sides of the valve seat assembly in the axial direction. An annular boss is integrally provided in the valve body. One elastic pad is installed between the annular boss and the first elastic sealing ring, and the other elastic pad is installed between the second elastic sealing ring and the pressure ring.

2. The resilient bidirectional metal hard-seal butterfly valve according to claim 1, characterized in that: The sliding plate is fan-shaped, and the sliding plates are assembled to form a whole circle. There is an movable gap between adjacent sliding plates. A limit pin is detachably installed at the center of the butterfly plate, and the outer wall of the limit pin abuts against the sliding plate.

3. The resilient bidirectional metal hard-seal butterfly valve according to claim 2, characterized in that: A compression spring is provided within the movable gap, and the two ends of the compression spring abut against two adjacent sliding plates respectively.

4. The resilient bidirectional metal hard-seal butterfly valve according to claim 1, characterized in that: The contact surface between the butterfly plate and the sliding plate is inclined to the axial direction of the valve body, and the contact surface is centrally raised.

5. The resilient bidirectional metal hard-seal butterfly valve according to claim 1, characterized in that: The butterfly plate is fixed with a T-shaped guide rail, the guide rail is arranged in the radial direction of the butterfly plate, and the sliding plate is provided with a track groove that matches the guide rail.

6. The resilient bidirectional metal hard-seal butterfly valve according to claim 1, characterized in that: The cross-section of the third elastic sealing ring is "C" shaped, which includes an outer arc portion and an inner arc portion. The outer arc portion is sealed and fitted with the second elastic sealing ring. An annular groove is provided on the outer wall of the sliding plate, and the inner arc portion is placed in the annular groove.

7. The resilient bidirectional metal hard-seal butterfly valve according to claim 1, characterized in that: The pressure ring is provided with a top inclined platform, which abuts against the outer peripheral wall of the valve seat assembly, and the contact surfaces of the two are staggered by inclined surfaces.

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