CN220566602U

CN220566602U - Butterfly valve

Info

Publication number: CN220566602U
Application number: CN202322263430.XU
Authority: CN
Inventors: 陆灵威; 程学来
Original assignee: Neway Valve Suzhou Co Ltd
Current assignee: Neway Valve Suzhou Co Ltd
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2024-03-08
Anticipated expiration: 2033-08-22

Abstract

The utility model discloses a butterfly valve, and particularly relates to the technical field of valves. The butterfly valve comprises a valve body, a valve rod, a valve cover and a first pre-tight sealing assembly; the valve body is provided with a valve cavity, and the wall of the valve cavity is provided with a first step surface; the valve rod is inserted into the valve cavity; the valve cover is arranged on the opening of the valve cavity and presses one end of the valve rod; the first pre-tightening sealing assembly comprises a first pressing sleeve, a plurality of circles of first fillers and a first elastic piece, wherein the first pressing sleeve is arranged on the end part of the valve rod, the first elastic piece is arranged between one end of the first pressing sleeve and the valve cover, and the plurality of circles of first fillers are arranged around the valve rod and are positioned between the other end of the first pressing sleeve and the first step surface. The utility model improves the sealing structure of the valve rod, improves the sealing performance of the butterfly valve, avoids sealing failure, prevents operators from being endangered by leakage of highly toxic media or high-permeability and high-temperature media, and realizes effective and safe sealing.

Description

Butterfly valve

Technical Field

The utility model relates to the technical field of valves, in particular to a butterfly valve.

Background

The existing butterfly valve comprises a valve body, a valve rod, a valve cover, a graphite gasket and other parts, wherein the valve rod is installed in the valve body and is fixed through the valve cover in a pressing mode, and the valve cover and the valve body are sealed through the graphite gasket.

However, since only one graphite gasket is arranged at the lower end of the valve rod to perform static seal, once the static seal fails, medium leakage can be caused.

Disclosure of Invention

The utility model mainly aims to provide a butterfly valve, which aims to improve the sealing performance of the butterfly valve so as to avoid the problem of medium leakage caused by sealing failure.

To achieve the above object, the present utility model provides a butterfly valve, comprising:

the valve body is provided with a valve cavity, and a first step surface is arranged on the cavity wall of the valve cavity;

the valve rod is inserted into the valve cavity;

the valve cover is covered on the opening of the valve cavity and presses one end of the valve rod; and

the first pre-tightening sealing assembly comprises a first pressing sleeve, a plurality of circles of first fillers and a first elastic piece, wherein the first pressing sleeve is sleeved on the end part of the valve rod, the first elastic piece is arranged between one end of the first pressing sleeve and the valve cover, and the plurality of circles of first fillers encircle the valve rod and are positioned between the other end of the first pressing sleeve and the first step surface.

Optionally, a pressing block is arranged between the end face of the valve rod and the valve cover, the pressing block and the valve body enclose to form a containing groove for containing the first elastic piece, one end of the first elastic piece is in butt joint with the first pressing sleeve, and the other end of the first elastic piece is in butt joint with the groove wall of the containing groove.

Optionally, the pressing block is fixedly connected with the valve rod through a bolt.

Optionally, a backing ring is arranged between the plurality of circles of the first packing and the first pressing sleeve.

Optionally, a groove is formed in a contact surface of the valve cover and the end face of the valve body, and a winding pad is arranged in the groove.

Optionally, the first elastic element is a disc spring.

Optionally, the material of the first filler is graphite.

Optionally, the butterfly valve further includes a second pre-tight seal assembly disposed at the other end of the valve stem for sealing the other end of the valve stem.

Optionally, the second pre-tight sealing component comprises a second pressing sleeve, a plurality of circles of second fillers, a second elastic piece and a pressing plate, wherein the second pressing sleeve is sleeved on the other end of the valve rod, a second step surface is arranged on the cavity wall of the valve cavity, one ends of the second fillers are abutted to the second step surface, the plurality of circles of second fillers are abutted to the second pressing sleeve, the pressing plate is pressed on the second pressing sleeve, and the second elastic piece is arranged on the pressing plate through a slipknot nut.

Optionally, the second elastic element is a disc spring.

In the technical scheme of the utility model, the butterfly valve comprises a valve body, a valve rod, a valve cover and a first pre-tight sealing component; the valve body is provided with a valve cavity, and the wall of the valve cavity is provided with a first step surface; the valve rod is inserted into the valve cavity; the valve cover is arranged on the opening of the valve cavity and presses one end of the valve rod; the first pre-tightening sealing assembly comprises a first pressing sleeve, a plurality of circles of first fillers and a first elastic piece, wherein the first pressing sleeve is arranged on the end part of the valve rod, the first elastic piece is arranged between one end of the first pressing sleeve and the valve cover, and the plurality of circles of first fillers are arranged around the valve rod and are positioned between the other end of the first pressing sleeve and the first step surface. It can be understood that the sealing structure of the valve rod is improved, so that the sealing performance of the butterfly valve is improved, the problem of medium leakage caused by sealing failure is avoided, operators are effectively prevented from being endangered by leakage of highly toxic media or high-permeability and high-temperature media, and effective and safe sealing is realized.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of one embodiment of a butterfly valve of the utility model;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic diagram of a butterfly valve according to an embodiment of the utility model.

Reference numerals illustrate:

10. a valve body; 20. a valve stem; 30. a valve cover; 40. a first pre-tight seal assembly; 50. a second pre-tight seal assembly; 101. a first step surface; 41. a first press sleeve; 42. a first filler; 43. a first elastic member; 44. briquetting; 45. a bolt; 46. a backing ring; 47. winding a pad; 51. a second press sleeve; 52. a second filler; 53. a second elastic member; 54. a pressing plate; 55. a slip-knot nut; 102. and a second step surface.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a butterfly valve.

Referring to fig. 1 and 2, in one embodiment of the present utility model, the butterfly valve comprises a valve body 10, a valve stem 20, a bonnet 30, and a first pre-seal assembly 40; the valve body 10 is provided with a valve cavity, and the wall of the valve cavity is provided with a first step surface 101; the valve rod 20 is inserted into the valve cavity; the valve cover 30 is arranged on the opening of the valve cavity in a covering way and presses one end of the valve rod 20; the first pre-tightening sealing assembly 40 comprises a first pressing sleeve 41, a plurality of circles of first packing 42 and a first elastic piece 43, wherein the first pressing sleeve 41 is sleeved on the end part of the valve rod 20, the first elastic piece 43 is arranged between one end of the first pressing sleeve 41 and the valve cover 30, and the plurality of circles of first packing 42 are arranged around the valve rod 20 and are positioned between the other end of the first pressing sleeve 41 and the first step surface 101.

In this embodiment, the first pre-tight seal 40 is used to seal the lower end of the valve stem 20 to avoid leakage of medium from the gap between the lower end of the valve stem 20 and the valve body 10.

The lower end cavity wall of the valve cavity is provided with a plurality of circles of first packing 42, and besides the daily bearing dustproof performance is met, the plurality of circles of first packing 42 also contacts with the lower end of the valve rod 20 by means of the force transmitted by the first pressing sleeve 41 to realize sealing.

The number of turns of the first filler 42 may be preferably 5, and the material thereof may be preferably graphite or the like, which is not limited thereto.

The first elastic member 43 may be a member having elasticity such as a spring, particularly, a disc spring, which is not limited thereto. The disc spring is an elastic part, can store and release the pretightening force, and the metal can rapidly release the pretightening force because of the sealing gap reserved by high-temperature deformation, so that the first filler 42 compensates the deformation gap.

It should be noted that conventional butterfly valves typically use a single ring of graphite for sealing. However, this configuration fails to meet the sealing requirements of the valve stem 20 at high temperatures, and the lack of additional adjustable preload of the graphite due to elevated temperatures typically results in collapse of the graphite and eventual seal failure. The utility model can make up the sealing force of the graphite at high temperature by arranging the graphite in a plurality of circles, and can quickly compact the graphite after the graphite is loosened by matching with the pretightening force of the disc spring.

It can be appreciated that by improving the sealing structure of the valve rod 20, the sealing performance of the butterfly valve is improved, the problem of medium leakage caused by sealing failure is avoided, operators are effectively prevented from being endangered by leakage of highly toxic media or high-permeability and high-temperature media, and effective and safe sealing is realized.

In order to further improve the sealing performance and improve the reliability of the assembly of the first elastic member 43, referring to fig. 1 and 2, in an embodiment, a pressing block 44 may be disposed between the end surface of the valve rod 20 and the valve cover 30, the pressing block 44 and the valve body 10 enclose to form a containing groove for accommodating the first elastic member 43, one end of the first elastic member 43 abuts against the first pressing sleeve 41, and the other end of the first elastic member 43 abuts against a groove wall of the containing groove.

In this embodiment, the pressing block 44 may be connected and fixed to the valve stem 20 by a bolt 45, which is not limited herein.

Further, a backing ring 46 may be provided between the plurality of turns of the first packing 42 and the first press jacket 41. In this embodiment, the first pressing sleeve 41 presses the pressing block 44 by means of the bolt 45, the transferred pre-tightening force is transferred to the first elastic member 43, and contacts with the first pressing sleeve 41 to transfer the pre-tightening force to the backing ring 46, and the backing ring 46 seals the first packing 42.

Referring primarily to FIG. 2, in one embodiment, the interface between the valve cover 30 and the end face of the valve body 10 is provided with a recess in which a winding pad 47 may be disposed. In this way, the tightness between the valve cover 30 and the valve body 10 can be effectively enhanced, and the leakage of the medium can be further avoided.

To enhance the sealing of the upper end of the valve stem 20, referring to fig. 1 and 3, in one embodiment, the butterfly valve may further include a second pre-seal assembly 50, where the second pre-seal assembly 50 is disposed at the other end of the valve stem 20 for sealing the other end of the valve stem 20.

In this embodiment, the second pre-tight sealing assembly 50 may include a second pressing sleeve 51, a plurality of rings of second packing 52, a second elastic member 53 and a pressing plate 54, wherein the second pressing sleeve 51 is sleeved on the other end of the valve rod 20, a second step surface 102 is disposed on a cavity wall of the valve cavity, one end of the plurality of rings of second packing 52 is abutted on the second step surface 102, the other end of the plurality of rings of second packing 52 is abutted on the second pressing sleeve 51, the pressing plate 54 is pressed on the second pressing sleeve 51, and the second elastic member 53 is disposed on the pressing plate 54 through a slipknot nut 55.

Similarly, the number of turns of the second filler 52 may be preferably 5, and the material may be preferably graphite, etc., without limitation.

The second elastic member 53 may be a member having elasticity such as a spring, particularly, a disc spring, which is not limited thereto. The disc spring is an elastic part, can store and release the pretightening force, and the metal can rapidly release the pretightening force because of the sealing gap reserved by high-temperature deformation, so that the second filler 52 compensates the deformation gap.

In this embodiment, the slipknot nut 55 may provide an external initial force, the disc spring provides an additional elastic pre-tightening force, the pre-tightening force acts on the pressing plate 54, and the pressing force of the pressing plate 54 acts on the second pressing sleeve 51, so that the multi-ring second packing 52 may realize elastic torque sealing at high temperature.

The utility model enhances the tightness of the lower end of the valve rod 20 by arranging the first pre-tight sealing component 40 at the lower end of the valve rod 20, and realizes the sealing of the upper end of the valve rod 20 by arranging the second pre-tight sealing component 50 at the upper end of the valve rod 20, thereby greatly improving the sealing performance of the butterfly valve, effectively avoiding the endangering operators due to the leakage of highly toxic media or high-permeability and high-temperature media, and realizing effective and safe sealing.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. A butterfly valve, comprising:

the valve rod is inserted into the valve cavity;

2. The butterfly valve according to claim 1, wherein a pressing block is disposed between an end face of the valve rod and the valve cover, the pressing block and the valve body enclose a containing groove in which the first elastic element is contained, one end of the first elastic element is abutted against the first pressing sleeve, and the other end of the first elastic element is abutted against a groove wall of the containing groove.

3. The butterfly valve of claim 2, wherein the pressure block is secured to the valve stem by a bolt.

4. The butterfly valve of claim 1, wherein a backing ring is disposed between the plurality of turns of the first packing and the first pressure jacket.

5. The butterfly valve of claim 1, wherein a groove is provided in a contact surface of the valve cover and the valve body end surface, and a winding pad is provided in the groove.

6. The butterfly valve of claim 1, wherein the first resilient member is a disc spring.

7. The butterfly valve of claim 1, wherein the first filler material is graphite.

8. The butterfly valve of any one of claims 1 to 7, further comprising a second pre-seal assembly disposed at the other end of the valve stem for sealing the other end of the valve stem.

9. The butterfly valve of claim 8, wherein the second pre-tight seal assembly includes a second press sleeve, a plurality of rings of second packing, a second elastic member, and a pressing plate, wherein the second press sleeve is sleeved on the other end of the valve rod, a second step surface is provided on a cavity wall of the valve cavity, one ends of the plurality of rings of second packing abut on the second step surface, the other ends of the plurality of rings of second packing abut on the second press sleeve, the pressing plate is pressed on the second press sleeve, and the second elastic member is arranged on the pressing plate through a slipknot nut.

10. The butterfly valve of claim 9, wherein the second resilient member is a disc spring.