CN218267274U - Butterfly valve shaft seal structure and butterfly valve - Google Patents

Abstract

The utility model provides a butterfly valve shaft seal structure and a butterfly valve, which comprises a valve body, a driving shaft and a follow-up shaft; a valve seat is embedded in the valve body, and a valve hole and a shaft hole which are intersected and communicated are formed in the valve seat; the driving shaft is hermetically arranged at the part of the shaft hole, which is positioned at one side of the valve hole, in a penetrating way and is in rotating fit with the shaft hole, one end of the driving shaft is connected with the valve plate, and the other end of the driving shaft is used for connecting a driving piece; the follow-up shaft is hermetically arranged at the part of the shaft hole, which is positioned at the other side of the valve hole, and one end of the follow-up shaft is connected with the valve plate and is in running fit with the shaft hole and/or the valve plate; wherein, the position cover that the drive shaft wore out the valve body is equipped with the location gland, and the location gland is fixed with the valve body spiro union, and the sealed end that has connect soon of the drive shaft is kept away from in the shaft hole has the end cap, and end wall butt that end cap and follow-up shaft deviate from the valve plate. The utility model provides a butterfly valve bearing seal structure and butterfly valve can reduce the assembly and dismantle the degree of difficulty, improves the sealing reliability.

Description

Butterfly valve shaft seal structure and butterfly valve

Technical Field

The utility model belongs to the technical field of the valve, concretely relates to butterfly valve bearing seal structure and butterfly valve.

Background

Butterfly valves are commonly used to control the flow of various types of fluids, such as air, water, steam, various corrosive media, slurries, oils, liquid metals, radioactive media, and the like, and mainly perform the functions of cutting and throttling on pipelines. The butterfly valve opening and closing piece is a disc-shaped butterfly plate, namely a valve plate, and the butterfly plate rotates around the axis of the butterfly plate in the valve body under the driving of a driving force, so that the opening and closing or the adjustment are realized.

The connection between the valve plate and the valve body in the existing common butterfly valve is in two modes, one mode is that the valve plate shaft integrally penetrates through the central axis of the valve plate, the other mode is that the valve plate shaft adopts a two-section structure and does not need to completely penetrate through the valve plate, one section of the valve plate shaft is used as a driving shaft, and the other section of the valve plate shaft only provides a rotary connection foundation; no matter which way, all need set up axial locking structure between valve plate axle and the valve body in order to avoid the valve plate to follow its rotation axial float, still need cooperate the bearing seal structure in order to prevent leakage simultaneously, the structure commonly used in this position of current product is through the cooperation of pegging graft with the epaxial predetermined locating hole of valve plate with the pin of valve plate on the radial interference grafting along the valve plate axle and carries out the grafting cooperation, thereby form the locking structure of valve plate axle, set up the sealing washer in the side of locking structure simultaneously in order to form holistic bearing seal structure, and other sealed measures are no longer taken to the axle head, the drawback of this kind of structure lies in that its assembly is relatively poor with the dismantlement nature, the epaxial locating hole of valve plate is difficult to aim at smoothly to the pin when mainly embodying, the pin is difficult to extract again during the dismantlement, and because the existence of pinhole on the valve body, also lead to the valve plate axle and be close to the sealed degree of difficulty increase of this position, influence the bearing seal reliability.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a butterfly valve bearing seal structure and butterfly valve aims at solving the bearing seal structure assembly that current butterfly valve adopted and dismantles the degree of difficulty big, and the low problem of sealing reliability.

In order to achieve the above object, the utility model adopts the following technical scheme: in a first aspect, there is provided a butterfly valve shaft seal structure, including:

the valve comprises a valve body, wherein a valve seat is embedded in the valve body, a valve hole is formed in the valve seat, a shaft hole which is intersected and communicated with the valve hole is formed in the valve body, and the shaft hole penetrates through the valve body along the radial direction of the valve hole;

the driving shaft is hermetically penetrated and arranged at the part of the shaft hole, which is positioned at one side of the valve hole, and is in running fit with the shaft hole, one end of the driving shaft extends into the valve hole and is connected with the valve plate, and the other end of the driving shaft penetrates out of the valve body and is used for connecting a driving piece;

the follow-up shaft is hermetically arranged at the part of the shaft hole, which is positioned at the other side of the valve hole in a penetrating manner, one end of the follow-up shaft extends into the valve hole along the axial direction of the driving shaft and is connected with the valve plate, the follow-up shaft is in rotating fit with the shaft hole and/or the valve plate, and the end part of the follow-up shaft, which is far away from the valve plate, is provided with a threaded hole;

wherein, the position cover that the drive shaft wore out the valve body is equipped with the location gland, and the location gland is fixed with the valve body spiro union, and the sealed end that has connect soon of the drive shaft is kept away from in the shaft hole has the end cap, and end wall butt that end cap and follow-up shaft deviate from the valve plate.

With reference to the first aspect, in one possible implementation manner, the shaft hole includes a first shaft hole and a second shaft hole which are respectively located at two sides of the valve hole and are coaxially arranged; wherein, first shaft hole and drive shaft normal running fit, follow-up shaft wear to locate in the second shaft hole.

In some embodiments, a first shaft sleeve is fixedly embedded at one end of the first shaft hole close to the valve plate, a second shaft sleeve is embedded at one end of the first shaft hole far away from the valve plate, a first sealing ring is sleeved on the driving shaft between the first shaft sleeve and the second shaft sleeve, and the first sealing ring is used for sealing a gap between the driving shaft and the first shaft hole.

Exemplarily, the first shaft hole is provided with two second shaft sleeves in a sliding embedding manner, the first sealing ring is positioned between the two second shaft sleeves, an elastic supporting piece is arranged between the second shaft sleeve close to the valve plate and the first shaft sleeve, and the second shaft sleeve far away from the valve plate is abutted to the positioning gland.

For example, the part of the follower shaft extending into the valve hole is rotatably sleeved with a third shaft sleeve, and the third shaft sleeve is fixedly embedded in the blind hole on one side of the valve plate.

In a possible implementation manner, a second sealing ring is arranged between the follow-up shaft and the second shaft hole.

In some embodiments, the position of the follow-up shaft in the second shaft hole is provided with an annular groove, and the second sealing ring is nested in the annular groove.

Illustratively, a third sealing ring is further sleeved on the follow-up shaft, and the third sealing ring is pressed between the valve seat and the valve body in a sealing mode.

For example, the valve seat is a rubber seat, and two metal support rings are embedded in the outer peripheral wall of the valve seat at intervals.

The utility model provides a butterfly valve bearing seal structure's beneficial effect lies in: compared with the prior art, the butterfly valve shaft seal structure of the utility model has the advantages that the valve plate adopts the driving shaft and the follow-up shaft which are coaxially arranged to realize two-section connection, and the driving shaft, the follow-up shaft and the shaft hole are all in sealing connection, wherein the driving shaft is connected with the driving piece to drive the valve plate to rotate to open and close, and the follow-up shaft is used as the rotating connection foundation of the other side of the valve plate; the driving shaft realizes axial positioning by utilizing the abutting of the positioning gland, so that a sealing structure is convenient to arrange, the dismounting and the mounting are convenient and labor-saving, the axial positioning can be realized by the plug screwed at the end part of the shaft hole of the follow-up shaft, the sealing can be formed, particularly, the follow-up shaft can be directly inserted into the shaft hole to be screwed with the plug when being assembled, the plug-in angle of the follow-up shaft is not required to be aligned, the follow-up shaft is dismounted only by utilizing a threaded hole to be screwed with a drawing tool for operation, the dismounting difficulty can be greatly reduced, and the efficiency is improved; in addition, the sealing structure of drive shaft and follow-up shaft can carry out the separation through location gland and end cap respectively, and need not to set up the pore structure that is used for wearing to establish the locating pin on the shaft hole, consequently can reduce the bearing seal failure rate, improves the bearing seal reliability of butterfly valve.

The second aspect, the embodiment of the utility model provides a still provide a butterfly valve, including above-mentioned butterfly valve bearing seal structure, have the same beneficial effect with above-mentioned butterfly valve bearing seal structure, no longer give unnecessary details here.

Drawings

Fig. 1 is a schematic structural diagram of a butterfly valve adopting a butterfly valve shaft seal structure provided by an embodiment of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a partially enlarged structural diagram of a portion B in fig. 2.

In the figure: 10. a valve body; 101. a first shaft hole; 102. a second shaft hole; 11. a valve seat; 110. a valve bore; 111. a metal support ring; 20. a drive shaft; 30. a follower shaft; 31. a threaded hole; 32. a ring groove; 40. positioning a gland; 50. a plug; 61. a first bushing; 62. a second shaft sleeve; 63. a first seal ring; 70. an elastic support member; 81. a third shaft sleeve; 82. a second seal ring; 83. a third seal ring; 90. a valve plate.

Detailed Description

In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention more clearly understood, the following description is made in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and are therefore not to be considered limiting. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or several of that feature. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 and fig. 2, a butterfly valve shaft seal structure according to the present invention will now be described. The shaft seal structure of the butterfly valve comprises a valve body 10, a driving shaft 20 and a follow-up shaft 30; a valve seat 11 is embedded in the valve body 10, a valve hole 110 is arranged on the valve seat 11, a shaft hole which is intersected and communicated with the valve hole 110 is arranged on the valve body 10, and the shaft hole penetrates through the valve body 10 along the radial direction of the valve hole 110; the driving shaft 20 is hermetically inserted into the shaft hole at a position on one side of the valve hole 110 and is in running fit with the shaft hole, one end of the driving shaft 20 extends into the valve hole 110 and is connected with the valve plate 90, and the other end of the driving shaft 20 penetrates through the valve body 10 and is used for connecting a driving part; the follow-up shaft 30 is hermetically arranged at the other side of the valve hole 110 in a penetrating manner in the shaft hole, one end of the follow-up shaft 30 extends into the valve hole 110 along the axial direction of the driving shaft 20 and is connected with the valve plate 90, the follow-up shaft 30 is in rotating fit with the shaft hole and/or the valve plate 90, and the end part of the follow-up shaft 30, which is far away from the valve plate 90, is provided with a threaded hole 31; the position that the drive shaft 20 penetrated through the valve body 10 is sleeved with a positioning gland 40, the positioning gland 40 is fixed with the valve body 10 in a threaded manner, one end of the shaft hole far away from the drive shaft 20 is connected with a plug 50 in a sealing and screwing manner, and the plug 50 is abutted against the end wall of the follow-up shaft 30 far away from the valve plate 90.

In the present embodiment, the end of the driving shaft 20 extending out of the valve body 10 may be connected to a valve handle as a manual valve or to a motor drive as an electric valve, and the present invention is not limited to a specific form.

Compared with the prior art, the shaft seal structure of the butterfly valve provided by the embodiment has the advantages that the valve plate 90 is connected in a two-section manner by adopting the driving shaft 20 and the follow-up shaft 30 which are coaxially arranged, and the driving shaft 20 and the follow-up shaft 30 are connected with the shaft hole in a sealing manner, wherein the driving shaft 20 is connected with the driving piece to drive the valve plate 90 to rotate to open and close, and the follow-up shaft 30 serves as a rotary connection foundation on the other side of the valve plate 90; the driving shaft 20 is axially positioned by utilizing the abutting of the positioning gland 40, so that a sealing structure is convenient to arrange, the dismounting and the mounting are convenient and labor-saving, the follow-up shaft 30 can be axially positioned through the plug 50 screwed at the end part of the shaft hole, the sealing can be formed, particularly, the follow-up shaft 30 is directly inserted into the shaft hole to be screwed with the plug 50 when being assembled, the alignment of the insertion angle of the follow-up shaft 30 is not needed, the follow-up shaft 30 can be dismounted only by utilizing the screwed hole 31 to be screwed with a drawing tool for operation, the dismounting and the mounting difficulty can be greatly reduced, and the efficiency is improved; in addition, the sealing structures of the driving shaft 20 and the follow-up shaft 30 can be separated through the positioning gland 40 and the plug 50 respectively, and a hole structure for penetrating a positioning pin is not required to be arranged on the shaft hole, so that the shaft seal failure rate can be reduced, and the shaft seal reliability of the butterfly valve is improved.

In some embodiments, referring to fig. 2, the shaft bore includes a first shaft bore 101 and a second shaft bore 102 located coaxially on either side of the valve bore 110; the first shaft hole 101 is rotatably engaged with the driving shaft 20, and the follower shaft 30 is disposed in the second shaft hole 102. That is to say, drive shaft 20 and follower shaft 30 are independent each other, only rely on its axiality and realize the rotation of valve plate 90 and connect, and both can independently go on when the dismouting, compare in the mode that adopts same root axis whole to pass valve plate 90, can both reduce the dismouting degree of difficulty, valve plate 90 only need process two blind holes respectively with drive shaft 20 and follower shaft 30 be connected can, can practice thrift the cost of valve plate 90 processing radial through-hole.

In some embodiments, referring to fig. 2, a first shaft sleeve 61 is fixedly embedded at one end of the first shaft hole 101 close to the valve plate 90, a second shaft sleeve 62 is embedded at one end of the first shaft hole 101 far from the valve plate 90, a first sealing ring 63 is sleeved on the driving shaft 20 between the first shaft sleeve 61 and the second shaft sleeve 62, and the first sealing ring 63 is used for sealing a gap between the driving shaft 20 and the first shaft hole 101.

Utilize first axle sleeve 61 and second axle sleeve 62 and drive shaft 20 normal running fit, can guarantee drive shaft 20's rotatory portability and stability to guarantee opening and close of valve plate 90 lightly, the closed condition is stable, utilizes the first sealing washer 63 that sets up between first axle sleeve 61 and second axle sleeve 62 simultaneously, can seal the turn-lash between primary shaft hole 101 and the drive shaft 20, thereby avoids leaking.

Specifically, in the present embodiment, two second shaft sleeves 62 are slidably inserted into the first shaft hole 101, the first sealing ring 63 is located between the two second shaft sleeves 62, wherein an elastic support 70 is arranged between the second shaft sleeve 62 close to the valve plate 90 and the first shaft sleeve 61, and the second shaft sleeve 62 far from the valve plate 90 abuts against the positioning gland 40. Can make elastic support 70 be in compression state after installation location gland 40 to make and form the elasticity clamping-force between two second axle sleeves 62, first sealing washer 63 presss from both sides and is adorned between two second axle sleeves 62, can have certain degree of freedom that floats along the axial of drive shaft 20 under the effect of elastic force, compare in conventional fixed mounting mode, can avoid first sealing washer 63 to receive the extrusion excessively and damage, thereby promote sealed reliability, utilize elastic support 70 to form elastic support to second axle sleeve 62 simultaneously, need not to set up additional location structure, thereby can reduce the dismouting operation degree of difficulty of drive shaft 20.

In some possible implementations, referring to fig. 1, the portion of the follower shaft 30 extending into the valve hole 110 is rotatably sleeved with a third shaft sleeve 81, and the third shaft sleeve 81 is fixedly embedded in a blind hole at one side of the valve plate 90. Through the embedded third axle sleeve 81 that establishes of blind hole at valve plate 90 to can guarantee the normal running fit stability between follow-up shaft 30 and the valve plate 90.

In this embodiment, the second seal ring 82 is disposed between the follower shaft 30 and the second shaft hole 102. Specifically, the groove 32 is formed in the portion of the follower shaft 30 located in the second shaft hole 102, and the second seal ring 82 is nested in the groove 32. The provision of the second seal ring 82 enables the rotation gap between the follower shaft 30 and the second shaft hole 102 to be sealed, thereby preventing leakage.

Optionally, in this embodiment, a third sealing ring 83 is further sleeved on the follower shaft 30, and the third sealing ring 83 is sealingly pressed between the valve seat 11 and the valve body 10. Because the length of the follow-up shaft 30 is shorter, the length of the second shaft hole 102 is also relatively shorter, and the risk of leakage is higher compared with the first shaft hole 101, a third sealing ring 83 is additionally arranged on the follow-up shaft 30, so that the sealing reliability is improved; in addition, the third seal 83 is provided between the valve seat 11 and the valve body 10, and also has a function of improving the sealing performance between the valve seat 11 and the valve body 10 at the position of the second shaft hole 102.

In this embodiment, the valve seat 11 is a rubber seat, and two metal support rings 111 are embedded in the outer circumferential wall of the valve seat 11 at intervals. The valve seat 11 is made of rubber materials, so that the sealing performance between the valve plate 90 and the valve hole 110 in a closed state can be guaranteed, and the radial rigidity of the valve seat 11 can be improved by using the two metal support rings 111, so that a leakage gap between the valve seat 11 and the valve plate 90 due to excessive deformation is avoided, and the working stability is guaranteed.

Based on the same inventive concept, with reference to fig. 1 to 3, an embodiment of the present application further provides a butterfly valve, including the butterfly valve shaft seal structure.

Compared with the prior art, the butterfly valve provided by the embodiment adopts the shaft seal structure of the butterfly valve, the valve plate 90 adopts the driving shaft 20 and the following shaft 30 which are coaxially arranged to realize two-section connection, and the driving shaft 20 and the following shaft 30 are hermetically connected with the shaft hole, wherein the driving shaft 20 is connected with the driving piece to drive the valve plate 90 to rotate to open and close, and the following shaft 30 serves as a rotating connection foundation on the other side of the valve plate 90; the driving shaft 20 is axially positioned by utilizing the abutting of the positioning gland 40, so that a sealing structure is convenient to arrange, the assembly and disassembly are convenient and labor-saving, the follow-up shaft 30 can realize axial positioning through the plug 50 screwed at the end part of the shaft hole, sealing can also be formed, particularly, the follow-up shaft 30 is directly inserted into the shaft hole to be screwed with the plug 50 when being assembled, the insertion angle of the follow-up shaft 30 does not need to be aligned, the follow-up shaft 30 can be disassembled only by utilizing a threaded hole 31 to be screwed with a drawing tool for operation, the assembly and disassembly difficulty can be greatly reduced, and the efficiency is improved; in addition, the sealing structures of the driving shaft 20 and the follow-up shaft 30 can be separated through the positioning gland 40 and the plug 50 respectively, and a hole structure for penetrating a positioning pin is not required to be arranged on the shaft hole, so that the shaft seal failure rate can be reduced, and the shaft seal reliability of the butterfly valve is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (10)

1. Butterfly valve shaft seal structure, its characterized in that includes:

the valve comprises a valve body, a valve seat is embedded in the valve body, a valve hole is formed in the valve seat, a shaft hole which is intersected and communicated with the valve hole is formed in the valve body, and the shaft hole penetrates through the valve body along the radial direction of the valve hole;

the driving shaft is hermetically arranged at the position, located on one side of the valve hole, of the shaft hole in a penetrating mode and is in rotating fit with the shaft hole, one end of the driving shaft extends into the valve hole and is connected with the valve plate, and the other end of the driving shaft penetrates out of the valve body and is used for being connected with a driving piece;

the follow-up shaft is hermetically arranged at the other side of the valve hole in a penetrating manner, one end of the follow-up shaft extends into the valve hole along the axial direction of the driving shaft and is connected with the valve plate, the follow-up shaft is in rotating fit with the valve hole and/or the valve plate, and a threaded hole is formed in the end part, away from the valve plate, of the follow-up shaft;

the valve plate is characterized in that a positioning gland is sleeved at the position, where the driving shaft penetrates out of the valve body, and is fixedly connected with the valve body in a threaded mode, one end, far away from the driving shaft, of the shaft hole is connected with a plug in a sealing and screwing mode, and the plug is abutted to the end wall, far away from the valve plate, of the follow-up shaft.

2. The butterfly valve shaft seal structure according to claim 1, wherein the shaft hole includes a first shaft hole and a second shaft hole coaxially disposed on both sides of the valve hole, respectively; the first shaft hole is matched with the driving shaft in a rotating mode, and the follow-up shaft penetrates through the second shaft hole.

3. The butterfly valve shaft seal structure of claim 2, wherein a first shaft sleeve is fixedly embedded at one end of the first shaft hole close to the valve plate, a second shaft sleeve is embedded at one end of the first shaft hole far from the valve plate, a first sealing ring is sleeved on the driving shaft between the first shaft sleeve and the second shaft sleeve, and the first sealing ring is used for sealing a gap between the driving shaft and the first shaft hole.

4. The butterfly valve shaft seal structure of claim 3 wherein two of said second bushings are slidably inserted into said first shaft bore, and said first seal ring is disposed between said two second bushings, wherein an elastic support is disposed between said second bushing proximate to said valve plate and said first bushing, and wherein said second bushing distal from said valve plate abuts against said positioning gland.

5. The butterfly valve shaft seal structure of claim 2, wherein a third shaft sleeve is rotatably sleeved on a portion of the follower shaft extending into the valve hole, and the third shaft sleeve is fixedly embedded in a blind hole on one side of the valve plate.

6. The butterfly valve shaft seal arrangement of claim 5 wherein a second seal ring is disposed between the follower shaft and the second shaft bore.

7. The butterfly valve shaft seal structure of claim 6, wherein the portion of the follower shaft located in the second shaft hole is provided with a ring groove, and the second seal ring is nested in the ring groove.

8. The butterfly valve shaft seal structure of claim 7, wherein a third seal ring is further sleeved on the follower shaft, and the third seal ring is sealingly pressed between the valve seat and the valve body.

9. The butterfly valve shaft seal structure of any one of claims 1 to 8, wherein the valve seat is a rubber seat, and two metal support rings are embedded in an outer peripheral wall of the valve seat at intervals.

10. A butterfly valve comprising the butterfly valve shaft seal of any of claims 1 to 9.

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