CN217762102U

CN217762102U - Double-eccentric butterfly valve butterfly plate

Info

Publication number: CN217762102U
Application number: CN202221837606.7U
Authority: CN
Inventors: 蒋时泽; 陆颖; 王聪
Original assignee: Terrence Energy Co ltd
Current assignee: Terrence Energy Co ltd
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-11-08
Anticipated expiration: 2032-07-14

Abstract

The utility model relates to the technical field of valves, especially, relate to a double eccentric butterfly valve butterfly plate, include: the butterfly plate, the shaft seat, the valve rod and the two butterfly flaps; the shaft seat is fixedly connected to one side of the butterfly plate, is arranged at two ends of the valve rod and limits the position of the valve rod; the butterfly plate rotates along the straight line where the valve rod is located; the two butterfly flaps are respectively arranged on two sides of the butterfly plate, are centrosymmetric along the central position of the butterfly plate, and are respectively arranged on the same surface and the opposite surface of the shaft seat. Through the utility model discloses, solved the butterfly valve and lacked the shortcoming of equal percentage fluid characteristic to make the fluid characteristic more be close the flow characteristic of equal percentage, and realize the rectification and fall the effect of making an uproar when the fluid passes through, double eccentric effect makes the valve opened the back butterfly plate can break away from the disk seat promptly, eliminated butterfly plate and disk seat's unnecessary excessively extrudees, scraping phenomenon by a wide margin, lightened and opened the resistance distance, reduced wearing and tearing, improved the disk seat life-span.

Description

Double-eccentric butterfly valve butterfly plate

Technical Field

The utility model relates to the technical field of valves, especially, relate to a double eccentric butterfly valve butterfly plate.

Background

The double eccentric butterfly valve is the most widely used one at present, and the valve rod axis of the valve is deviated from the center of the butterfly plate and the center of the body. The double eccentric effect ensures that the butterfly plate can be separated from the inner wall quickly after the valve is opened, thereby greatly eliminating unnecessary excessive extrusion and scraping phenomena of the butterfly plate and the pipe body, reducing the opening resistance distance, reducing the abrasion and prolonging the service life of the butterfly valve.

At present, the flow characteristics of the general double-eccentric butterfly valve fluid are generally linear characteristics and approximate quick-opening characteristics, the equal percentage characteristics control the flow velocity of the fluid more accurately when the opening of the butterfly plate is smaller, and the double-eccentric butterfly valve plate with the equal percentage characteristics has the quick-opening characteristics when the opening is larger, so that the double-eccentric butterfly valve plate with the equal percentage characteristics in the fluid flow characteristics is urgently needed to be designed.

The information disclosed in this background section is only for enhancement of understanding of the general background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a double eccentric butterfly valve butterfly plate can effectively solve the problem among the background art.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a double offset butterfly valve plate, comprising: the butterfly plate, the shaft seat, the valve rod and the two butterfly flaps; the shaft seat is fixedly connected to one side of the butterfly plate, is arranged at two ends of the valve rod and limits the position of the valve rod; the butterfly plate rotates along the straight line where the valve rod is located; the two butterfly flaps are respectively arranged on two sides of the butterfly plate, are centrosymmetric along the center position of the butterfly plate, and are respectively arranged on the same surface and the opposite surface of the shaft seat.

Furthermore, the two butterfly valves are respectively a spherical valve and an elliptic valve, the spherical valve is cut by a spherical end socket, is fixed on the butterfly plate and is the same as the surface of the butterfly plate, and a plurality of first rectifying holes are formed in the spherical valve; the oval valve is cut by an oval end socket, the long axis of the oval valve is the diameter of the butterfly plate and is fixed on the butterfly plate and opposite to the surface where the butterfly plate is located, and a plurality of second rectifying holes are formed in the oval valve.

Further, the first rectifying hole and the second rectifying hole are uniformly distributed on the spherical lobe and the elliptical lobe respectively, and the distribution density of the first rectifying hole is greater than that of the second rectifying hole.

Further, the axle seat is offset on the butterfly plate to the side of the spherical lobe.

Furthermore, the spherical valve is attached to the outer edge of the butterfly plate, and a gap is reserved between the elliptical valve and the outer edge of the butterfly plate.

Further, the outer edge of the butterfly plate is wrapped with a sealing gasket.

Further, the butterfly plate is provided with seal assembly in external body inner wall department, seal assembly includes: the transmission mechanism comprises a step surface, a gasket, a spring, a first transmission block and a second transmission block;

the step surface is fixedly arranged at a contact part of the butterfly plate and the inner wall of the external pipe body and limits the position of the second transmission block;

one end of the first transmission block is abutted against the second transmission block, and the other end of the first transmission block and the gasket form an annular cavity to provide an installation space for the spring;

the second transmission block is pressed on the butterfly plate by the elasticity of the spring to play a role in sealing;

the springs are arranged in the annular cavity, two ends of each spring are respectively abutted against the first transmission block and the gasket, and extrusion force is provided for the first transmission block and the second transmission block;

the gasket is fixedly installed on the step surface and plays a role in limiting the first transmission block.

Through the technical scheme of the utility model, can realize following technological effect:

the butterfly valve effectively overcomes the defect that the butterfly valve is short of equal-percentage fluid characteristics, the fluid characteristics are closer to the equal-percentage flow characteristics, the rectification and noise reduction effects are realized when the fluid passes through, the butterfly plate can be separated from the valve seat immediately after the valve is opened due to the double-eccentric effect, the unnecessary excessive extrusion and scraping phenomena of the butterfly plate and the valve body are greatly eliminated, the opening resistance distance is reduced, the abrasion is reduced, and the service life of the butterfly valve is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a butterfly plate of a double eccentric butterfly valve;

FIG. 2 is a front view of a butterfly plate of the double eccentric butterfly valve;

FIG. 3 is a side view of a butterfly plate of the double eccentric butterfly valve;

FIG. 4 is a partial cross-sectional view of the tube wall;

FIG. 5 is an enlarged view of a portion of FIG. 3 at A;

FIG. 6 is a graph showing the variation of the fluid flow rate of a butterfly plate with the opening of the butterfly plate in a double eccentric butterfly valve

Reference numerals: 1. a butterfly plate; 11. a gasket; 21. a spherical flap; 210. a first flow straightening hole; 22. an elliptical lobe; 220. a second flow straightening orifice; 3. a shaft seat; 31. a valve stem; 41. a step surface; 42. a gasket; 43. a spring; 44. a first transmission block; 45. and a second transmission block.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1~6, a double offset butterfly valve butterfly plate, comprising: the butterfly plate 1, the shaft seat 3, the valve rod 31 and the two butterfly flaps; the shaft seat 3 is fixedly connected to one side of the butterfly plate 1, is arranged at two ends of the valve rod 31 and limits the position of the valve rod 31; the butterfly plate 1 rotates along the straight line of the valve rod 31; the two butterfly flaps are respectively arranged at two sides of the butterfly plate 1, are centrosymmetric along the central position of the butterfly plate 1, and are respectively arranged on the same surface and the opposite surface of the shaft seat 3.

Through the technical scheme of the utility model, effectively solved the lack of percentage fluid characteristic such as butterfly valve lacks, and make the fluid characteristic more be close the flow characteristic of percentage, and realize the rectification when the fluid passes through and fall the effect of making an uproar, double eccentric effect makes the valve be opened back butterfly plate 1 can break away from the disk seat promptly, eliminated butterfly plate 1 with the unnecessary of body excessively extrude, scrape the phenomenon by a wide margin, lightened and opened the resistance distance, reduced wearing and tearing, improved the butterfly valve life-span.

In the use, the butterfly plate 1 rotates along the rotating shaft to complete the opening and closing of the valve, and the two butterfly valves are used for realizing that the fluid flow characteristic is similar to an equal percentage characteristic, wherein the fluid flow is changed along with the opening of the butterfly plate 1 as shown in fig. 6, when the opening of the butterfly plate 1 is small, the flow velocity of the fluid is controlled more accurately, and when the opening is large, the butterfly plate has a quick opening characteristic, specifically, when the valve is just opened, because of the two butterfly valves arranged on the butterfly plate 1, the force resistance of the fluid flow velocity is large, the flow velocity is small, the precision control is realized, and when the butterfly plate 1 rotates to be close to 90 degrees, the fluid flow velocity is increased quickly, so that the quick opening is realized.

As a preferable example of the above embodiment, as shown in fig. 3, the two butterfly valves are a spherical valve 21 and an elliptic valve 22, the spherical valve 21 is cut by a spherical end socket, and is fixed on the butterfly plate 1 and is the same as the surface of the butterfly plate 1, and the spherical valve 21 is provided with a plurality of first rectifying holes 210; the elliptical valve 22 is cut by an elliptical seal head, the major axis of the elliptical valve 22 is the diameter of the butterfly plate 1 and is fixed on the butterfly plate 1 and opposite to the surface of the butterfly plate 1, and a plurality of second rectifying holes 220 are formed in the elliptical valve 22. The reason why the oval valve 22 is provided on the butterfly plate 1 side is that when the butterfly plate 1 is rotated, the oval valve 22 side is close to the inner wall of the pipe body, and if the same is provided in a spherical shape, the butterfly valve and the inner wall of the pipe body are squeezed and scraped, thereby causing abrasion.

In order to form a flow rectification effect inside the pipe body, in the above embodiment, the first and second

flow rectification holes

210 and 220 are uniformly distributed on the spherical and

elliptical lobes

21 and 22, respectively, and the distribution density of the first flow rectification holes 210 is greater than that of the second flow rectification holes 220. Referring to 1~3, since the area of one side of the spherical valve 21 is larger than that of the elliptic valve 22, the fluid flow velocity force resistance of one side of the spherical valve 21 is larger than that of one side of the elliptic valve 22, and in order to achieve the flow rectification effect, the distribution density of the first flow rectification hole 210 is larger than that of the second flow rectification hole 220, so that the difference of the fluid flow velocity caused by the difference of the force resistance of the two sides can be reduced, the flow rectification of each position can be achieved, the noise reduction and silencing effect can be achieved, and the abrasion of the pipe body and the butterfly valve caused by noise can be reduced.

In order to reduce the wear of the outer edge of the butterfly plate 1 and the valve body near the rotation axis when the butterfly plate 1 rotates, as shown in fig. 2, the shaft seat 3 is offset on the butterfly plate 1 to the side of the spherical flap 21. Because the outer edges of the butterfly plates 1 at the two ends of the diameter of the butterfly plate 1 can generate friction with the valve body when rotating, and because the convex part of the spherical valve 21 is larger than the convex part of the elliptic valve 22, the shaft seat 3 drives the valve rod 31 to deviate towards one side of the spherical valve 21, so that the outer edges of the butterfly plates 1 at the two ends of the valve rod 31 can eliminate abrasion with the valve body when rotating, the service life of the butterfly valve is prolonged, and the butterfly valve can be prevented from scraping with the inner wall of the pipe body.

The spherical flap 21 is attached to the outer edge of the butterfly plate 1, and the elliptical flap 22 is spaced from the outer edge of the butterfly plate 1 for the same purpose as the above embodiment. As shown in fig. 3, in the case of the offset of the valve rod 31, the one side of the elliptical flap 22 is more likely to scrape against the inner wall of the pipe body, and the offset is toward the center of the butterfly plate 1, that is, the gap is left between the elliptical flap 22 and the outer edge of the butterfly plate 1, so that the scraping can be avoided.

In order to enhance the sealing effect, in the above embodiment, the outer edge of the butterfly plate 1 is covered with the sealing gasket 11. Referring to fig. 4, the sealing gasket 11 is made of an elastic material, such as rubber, and when closed, can perform a good sealing function to prevent fluid from flowing out of the butterfly plate 1 and the slit of the inner wall of the tube body.

As a preference of the above embodiment, as shown in fig. 4, the butterfly plate 1 is provided with a sealing assembly at the inner wall of the external pipe body, the sealing assembly including: a step surface 41, a washer 42, a spring 43, a first transmission block 44 and a second transmission block 45; the step surface 41 is fixedly arranged at the contact part of the butterfly plate 1 and the inner wall of the external pipe body and limits the position of the second transmission block 45; one end of the first transmission block 44 is abutted against the second transmission block 45, and the other end of the first transmission block and the gasket 42 form an annular cavity to provide an installation space for the spring 43; the second transmission block 45 is pressed against the butterfly plate 1 by the elasticity of the spring 43, so that a sealing effect is achieved; a plurality of springs 43 are arranged in the annular cavity, and two ends of each spring are respectively abutted against the first transmission block 44 and the gasket 42 to provide extrusion force for the first transmission block 44 and the second transmission block 45; the washer 42 is fixedly mounted on the step surface 41 and limits the first transmission block 44. If only increase under the condition of sealed pad 11, long-time switching causes the wearing and tearing of sealed pad 11 easily, also probably drops, sets up seal assembly at the contact site of butterfly plate 1 and body inner wall, utilizes the extrusion and the reseing of spring 43 to first transmission piece 44 and second transmission piece 45, reaches the extrusion laminating all the time to sealed pad 11, when reducing the atress of sealed pad 11, realizes sealed effect.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a two eccentric butterfly valve butterfly plates which characterized in that includes: the butterfly plate, the shaft seat, the valve rod and the two butterfly flaps; the shaft seat is fixedly connected to one side of the butterfly plate, is arranged at two ends of the valve rod and limits the position of the valve rod; the butterfly plate rotates along the straight line where the valve rod is located; the two butterfly valves are respectively arranged on two sides of the butterfly plate, are centrosymmetric along the central position of the butterfly plate, and are respectively arranged on the same surface and the opposite surface of the shaft seat.

2. The double-eccentric butterfly valve plate according to claim 1, wherein the two butterfly flaps are a spherical flap and an elliptic flap, respectively, the spherical flap is cut by a spherical seal head and fixed on the butterfly plate, and is the same as the butterfly plate in the surface, and a plurality of first rectifying holes are formed in the spherical flap; the oval valve is cut by an oval end socket, the long axis of the oval valve is the diameter of the butterfly plate and is fixed on the butterfly plate and opposite to the surface where the butterfly plate is located, and a plurality of second rectifying holes are formed in the oval valve.

3. The double offset butterfly valve plate of claim 2 wherein the first and second commutating holes are evenly distributed over the spherical and elliptical lobes, respectively, and the first commutating holes have a distribution density that is greater than the second commutating holes.

4. The double offset butterfly valve plate of claim 3, wherein the axle seat is offset on the plate to one side of the spherical lobe.

5. The double offset butterfly valve plate of claim 2 wherein said spherical lobe abuts said outer edge of said plate and said elliptical lobe is spaced from said outer edge of said plate.

6. The double offset butterfly valve plate of any of claims 1~5, wherein an outer edge of said plate is coated with a gasket.

7. The double offset butterfly valve plate of claim 6, wherein the plate is provided with a seal assembly at an inner wall of the outer tube body, the seal assembly comprising: the transmission mechanism comprises a step surface, a gasket, a spring, a first transmission block and a second transmission block;

the second transmission block is pressed on the butterfly plate by the elasticity of the spring to play a sealing role;

the gasket is fixedly arranged on the step surface and plays a role in limiting the first transmission block.