Butterfly valve with multiple layers of sealing rings

Abstract

According to the technical scheme, the butterfly valve with the multiple layers of sealing rings is characterized by comprising a butterfly plate and a valve seat which can form sealing mutually, the butterfly plate comprises a bottom plate connected with a valve rod, a cover plate covering the bottom plate and a sealing set limited between the bottom plate and the cover plate and capable of being attached to the valve seat, the sealing group comprises a plurality of soft sealing rings and hard sealing rings which are alternately arranged, a plurality of through holes which take the axis of the butterfly plate as the center and are circumferentially distributed are formed in the soft sealing rings, and ejector rods which can be inserted into the through holes in a one-to-one correspondence mode are arranged on one end face of each hard sealing ring; the lengths of the ejector rods are smaller than the length of the through hole when the soft sealing ring is not compressed, the cover plate and the bottom plate jointly clamp the sealing set so that the ejector rods can abut against the nearest hard sealing ring, and the problems that in the prior art, the sealing effect is poor, and opening and closing are difficult are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, and more particularly to a butterfly valve with multi-layer sealing rings. Background Art

[0002] A butterfly valve, also known as a flap valve, is a regulating valve with a simple structure. It can be used for on-off control of low-pressure pipeline media. A butterfly valve is a valve in which the closing member (valve disc or butterfly plate) is a disc that rotates around the valve stem to achieve opening and closing.

[0003] The existing butterfly valve sealing design between the butterfly plate and the valve seat mostly adopts soft and hard sealing, that is, a plurality of soft sealing rings and hard sealing rings are arranged alternately in sequence at the edge of the butterfly plate and the outer wall of which can be tightly attached to the valve seat. For example, the Chinese patent with publication number CN219510150U discloses a fluorine-lined butterfly valve with a multi-layer stainless steel sheet sealing ring. The soft sealing ring used is a rubber sheet and the hard sealing ring is a stainless steel sheet. Although the soft and hard sealing can effectively improve the sealing between the butterfly plate and the valve seat, there are still defects. The elastic deformation capacity of the multiple clamped soft sealing rings is different, resulting in different extension lengths of each soft sealing ring relative to the diameter direction of the butterfly plate. The edges of some soft sealing rings are raised relative to the edges of the adjacent hard sealing rings, and the edges of some soft sealing rings are recessed relative to the edges of the adjacent hard sealing rings. This will cause the overall edge surfaces of the soft and hard sealing rings to be uneven, resulting in increased friction when the butterfly plate is screwed into or out of the valve seat, requiring greater torque and reducing the sealing effect between the butterfly plate and the valve seat. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a butterfly valve that is easy to open and close and has a stable sealing effect.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a butterfly valve with multi-layer sealing rings, comprising a butterfly plate and a valve seat that can form a seal with each other, the butterfly plate comprising a bottom plate connected to the valve stem, a cover plate covering the bottom plate, and a sealing group limited between the bottom plate and the cover plate and capable of fitting with the valve seat, the sealing group comprising a plurality of soft sealing rings and hard sealing rings arranged alternately, a plurality of the soft sealing rings are provided with a plurality of through holes centered on the axis of the butterfly plate and distributed in a circular pattern, a plurality of the hard sealing rings are provided on one end face with a push rod that can be inserted into the through hole in a one-to-one correspondence, the length of the plurality of push rods are all less than the length of the through hole when the soft sealing ring is not compressed, and the sealing group is clamped together by the cover plate and the bottom plate so that the push rod touches the hard sealing ring closest to it.

[0006] As a further improvement of the present invention, the number of the hard sealing rings is greater than the number of the soft sealing rings, and the bottom plate or the cover plate is provided with grooves for accommodating the top rods of adjacent hard sealing rings.

[0007] As a further improvement of the present invention, the number of the hard sealing rings is equal to the number of the soft sealing rings, and the bottom plate or the cover plate is in close contact with the adjacent soft sealing rings and can touch the top rod.

[0008] As a further improvement of the present invention, the number of the hard sealing rings is less than the number of the soft sealing rings, and the bottom plate or the cover plate is provided with a plate top rod having the same structure as the top rod and capable of being inserted into an adjacent soft sealing ring.

[0009] As a further improvement of the present invention, the end surface of the push rod that is not connected to the corresponding hard sealing ring is spherical.

[0010] As a further improvement of the present invention, the diameter of the push rod gradually decreases in the direction in which the push rod moves away from the connected hard sealing ring.

[0011] The beneficial effects of the present invention are as follows: the sealing group is clamped by the cover plate and the bottom plate together so that the push rod touches the nearest hard sealing ring. Compared with the existing technology, this design makes the push rod touch the nearest hard sealing ring so that the soft sealing ring no longer deforms, ensuring that the deformations of multiple soft sealing rings are the same or similar, thereby ensuring that the sealing surfaces of the sealing group and the valve seat remain flush, effectively improving the sealing stability between the valve seat and the sealing group; at the same time, it effectively compensates for the uneven sealing surface defects of the sealing group, and the friction generated between the sealing group and the valve seat is within a reasonable range, which facilitates the butterfly plate to rotate smoothly relative to the valve seat, thereby improving the opening and closing efficiency of the butterfly plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the main sectional view of the utility model;

[0013] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0014] Figure 3 for Figure 2 State diagram when the number of medium-hard sealing rings is greater than that of soft sealing rings;

[0015] Figure 4 for Figure 2 State diagram when the number of medium-hard sealing rings is less than that of soft sealing rings;

[0016] Figure 5 for Figure 2 The diagram shows the state when no seal is formed with the valve seat and no cover is installed.

[0017] Figure numerals: 1, butterfly plate; 11, bottom plate; 12, cover plate; 13, sealing group; 14, soft sealing ring; 15, hard sealing ring; 16, through hole; 17, push rod; 18, groove; 19, plate push rod; 2, valve seat. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments, wherein the same components are denoted by the same reference numerals.

[0019] Reference Figures 1 to 5 As shown, a butterfly valve with multiple sealing rings in this embodiment includes a butterfly plate 1 and a valve seat 2 that can form a seal with each other. The butterfly plate 1 includes a base plate 11 connected to the valve stem, a cover plate 12 covering the base plate 11, and a sealing group 13 limited between the base plate 11 and the cover plate 12 and capable of affixing to the valve seat 2. The sealing group 13 includes a plurality of soft sealing rings 14 and hard sealing rings 15 arranged alternately.

[0020] Based on the aforementioned prior art, multiple soft sealing rings 14 are each provided with multiple through holes 16 located on the same circumference and coaxial with the butterfly plate 1. A push rod 17 capable of being inserted into the through hole 16 is integrally formed on one end surface of each of the multiple hard sealing rings 15. When the soft sealing ring 14 is not elastically compressed, the length of the through hole 16 is greater than the length of the push rod 17, and the inner diameter of the through hole 16 is slightly larger than the diameter of the push rod 17. This is to reduce the clamping force generated by the through hole 16 on the push rod 17 when the soft sealing ring 14 is deformed and contracts, thereby facilitating the linear movement of the push rod 17 in the through hole 16. The quantitative relationship between the soft sealing ring 14 and the hard sealing ring 15 is roughly the following three situations:

[0021] The first one is specific reference Figure 3As shown, the number of hard sealing rings 15 is one more than the number of soft sealing rings 14. During the assembly of the butterfly plate 1, the bottom plate 11 is laid flat on the ground, and then a hard sealing ring 15 is placed on the bottom plate 11 and the top rod 17 on the hard sealing ring 15 is vertically upward. Then, the multiple through holes 16 of the soft sealing ring 14 are respectively sleeved on the outside of the multiple top rods 17 and the soft sealing ring 14 is located above the hard sealing ring 15. The multiple top rods 17 are all accommodated in the corresponding through holes 16 and the height of the end of the top rod 17 is lower than the height of the upper end opening of the through hole 16. Then, the remaining hard sealing rings 15 and soft sealing rings 14 are placed on the bottom plate 11 in turn. Then, the multiple hard sealing rings 15 and the multiple soft sealing rings 14 are superimposed together. There are two ways to handle the hard sealing ring 15 at the top of the sealing group 13. One of them can be By removing the ejector pin 17 on the hard sealing ring 15 to form a sheet with both end faces being flat, the cover plate 12 is not processed in any way and is covered on the bottom plate 11 so that the cover plate 12 and the hard sealing ring 15 are fully fitted. Secondly, a groove 18 for accommodating the ejector pin 17 can be processed on the end face of the cover plate 12. After the cover plate 12 is covered on the bottom plate 11, the ejector pin 17 is inserted into the groove 18. The above two methods can achieve that the cover plate 12 and the bottom plate 11 are fully fitted with the adjacent hard sealing ring 15 and clamp the sealing group 13. Under the action of the extrusion force of the sealing group 13, the multiple soft sealing rings 14 are elastically compressed and radially extended, and the length of the through hole 16 is reduced until the length of the through hole 16 is the same as the length of the ejector pin 17. Then the ejector pin 17 contacts the hard sealing ring 15 closest to the cover plate 12, and the multiple soft sealing rings 14 are no longer deformed.

[0022] Second, specific reference Figure 2 As shown, the number of hard sealing rings 15 is the same as the number of soft sealing rings 14. In the process of assembling the butterfly plate 1, the hard sealing ring 15 or the soft sealing ring 14 can be arbitrarily selected as the first one to be installed on the bottom plate 11. Here, the soft sealing ring 14 is installed on the bottom plate 11 as the first one, and then the remaining hard sealing rings 15 and soft sealing rings 14 are placed on the bottom plate 11 in sequence. Then, multiple hard sealing rings 15 and multiple soft sealing rings 14 are stacked together, and the top rod 17 is inserted into the adjacent soft sealing rings 14. Finally, the cover plate 12 is covered on the bottom plate 1 1, the cover plate 12 and the bottom plate 11 are fully fitted with the adjacent soft sealing rings 14 and hard sealing rings 15 respectively. The cover plate 12 and the bottom plate 11 jointly clamp the sealing group 13. Under the action of the extrusion force of the sealing group 13, multiple soft sealing rings 14 are elastically compressed and radially extended, and the length of the through hole 16 is reduced until the length of the through hole 16 is the same as the length of the push rod 17. Then the push rod 17 contacts the hard sealing ring 15 closest to the bottom plate 11, and the push rod 17 of the hard sealing ring 15 closest to the bottom plate 11 contacts the bottom plate 11. All soft sealing rings 14 are no longer deformed;

[0023] The third type, specific reference Figure 4 As shown, the number of hard sealing rings 15 is one less than the number of soft sealing rings 14. During the assembly of the butterfly plate 1, a plate top rod 19 can be integrally formed on the bottom plate 11 and the bottom plate 11 can be laid flat on the ground. Then, the multiple through holes 16 of the soft sealing ring 14 are respectively sleeved on the outside of the multiple plate top rods 19. The multiple plate top rods 19 are all accommodated in the corresponding through holes 16 and the height of the end of the plate top rod 19 is lower than the height of the upper end opening of the through hole 16. Then, the hard sealing ring 15 and the remaining soft sealing rings 14 are placed on the bottom plate 11 in turn, and the multiple hard sealing rings 15 and the multiple soft sealing rings 14 are stacked together. Then, the cover plate 12 is placed on the bottom plate 11. The cover plate 12 and the bottom plate 11 are fully fitted with the adjacent soft sealing rings 14 respectively. The cover plate 12 and the bottom plate 11 jointly clamp the sealing group 13. Under the action of the extrusion force of the sealing group 13, multiple soft sealing rings 14 are elastically compressed and radially extended, and the length of the through hole 16 is reduced until the length of the through hole 16 is the same as the length of the push rod 17 and the length of the through hole 16 is the same as the length of the plate push rod 19. Then, the push rod 17 contacts the hard sealing ring 15 closest to the bottom plate 11, and the hard sealing ring 15 closest to the bottom plate 11 contacts the plate push rod 19. All soft sealing rings 14 are no longer deformed.

[0024] Compared with the existing technology, this design prevents the soft sealing ring 14 from being deformed by the push rod 17 contacting the nearest hard sealing ring 15, ensuring that the deformations of multiple soft sealing rings 14 are the same or similar, thereby ensuring that the sealing surfaces of the sealing group 13 and the valve seat 2 remain flush, effectively improving the sealing stability between the valve seat 2 and the sealing group 13; at the same time, it effectively compensates for the uneven sealing surface defects of the sealing group 13, and the friction force generated between the sealing group 13 and the valve seat 2 is within a reasonable range, which facilitates the smooth rotation of the butterfly plate 1 relative to the valve seat 2, thereby improving the opening and closing efficiency of the butterfly plate 1.

[0025] As a specific embodiment of the improvement, refer to Figures 2 to 5 As shown, the end face of the push rod 17 that is not connected to the corresponding hard sealing ring 15 is spherical. Compared with the design in which the end face of the push rod 17 is flat, this design can effectively reduce the wear of the edge of the push rod 17 on the inner wall of the through hole 16, ensure that the push rod 17 can open the through hole 16 and pass through it smoothly, and at the same time reduce the friction between the through hole 16 and the push rod 17.

[0026] As a specific embodiment of the improvement, when the soft sealing ring 14 is deformed in the radial direction, the through hole 16 away from the part where the ejector pin 17 and the hard sealing ring 15 are connected shrinks greatly, which affects the advancement of the ejector pin 17. In order to solve the above problem, refer to Figures 2 to 5As shown, the diameter of the push rod 17 gradually decreases in the direction in which the push rod 17 moves away from the connected hard sealing ring 15. This design can increase the distance between the end of the push rod 17 and the inner wall of the through hole 16, thereby reducing the resistance to the advancement of the push rod 17 caused by the deformation of the through hole 16.

[0027] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A butterfly valve with multiple layers of sealing rings, comprising a butterfly plate (1) and a valve seat (2) capable of forming a seal with each other, wherein the butterfly plate (1) comprises a base plate (11) connected to the valve stem, a cover plate (12) covering the base plate (11), and a sealing group (13) limited between the base plate (11) and the cover plate (12) and capable of abutting against the valve seat (2), wherein the sealing group (13) comprises a plurality of soft sealing rings (14) and hard sealing rings (15) arranged alternately, characterized in that: The plurality of soft sealing rings (14) are each provided with a plurality of through holes (16) centered on the axis of the butterfly plate (1) and distributed in a circumferential manner. One end surface of the plurality of hard sealing rings (15) is provided with a push rod (17) that can be inserted into the through hole (16) in a one-to-one correspondence. The length of the plurality of push rods (17) is smaller than the length of the through hole (16) when the soft sealing ring (14) is not compressed. The sealing group (13) is clamped together by the cover plate (12) and the bottom plate (11) so that the push rod (17) contacts the hard sealing ring (15) that is closest to it.

2. The butterfly valve with multi-layer sealing ring according to claim 1, characterized in that: The number of the hard sealing rings (15) is greater than the number of the soft sealing rings (14), and the bottom plate (11) or the cover plate (12) is provided with grooves (18) for accommodating the top rods (17) of adjacent hard sealing rings (15).

3. The butterfly valve with multi-layer sealing ring according to claim 1, characterized in that: The number of the hard sealing rings (15) is equal to the number of the soft sealing rings (14), and the bottom plate (11) or the cover plate (12) is tightly attached to the adjacent soft sealing rings (14) and can contact the top rod (17).

4. The butterfly valve with multi-layer sealing ring according to claim 1, characterized in that: The number of the hard sealing rings (15) is less than the number of the soft sealing rings (14), and the bottom plate (11) or the cover plate (12) is provided with a plate top rod (19) having the same structure as the top rod (17) and capable of being inserted into an adjacent soft sealing ring (14).

5. A butterfly valve with a multi-layer sealing ring according to claim 1, 2, 3 or 4, characterized in that: The end surface of the push rod (17) not connected to the corresponding hard sealing ring (15) is spherical.

6. A butterfly valve with a multi-layer sealing ring according to claim 1, 2, 3 or 4, characterized in that: The diameter of the push rod (17) gradually decreases in a direction in which the push rod (17) moves away from the connected hard sealing ring (15).

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