CN210290792U

CN210290792U - Sealing structure of butterfly valve

Info

Publication number: CN210290792U
Application number: CN201920664902.3U
Authority: CN
Inventors: 何国豪; 区家显; 区展剑; 陈键明; 潘庆祥; 霍达文; 黄仲荣
Original assignee: GUANGDONG YONGQUAN VALVE TECHNOLOGY CO LTD
Current assignee: GUANGDONG YONGQUAN VALVE TECHNOLOGY CO LTD
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-04-10
Anticipated expiration: 2029-05-09

Abstract

The utility model discloses a sealing structure of a butterfly valve, which comprises a valve body, a butterfly plate, a valve rod, a sealing element and two first shaft sleeves; the valve body is provided with an inner cavity; the valve rod penetrates through the inner cavity; the two first shaft sleeves and the sealing element are positioned in the inner cavity; the sealing element is sleeved on the upper side of the valve rod; the two first shaft sleeves are respectively sleeved on the valve rod and are respectively arranged on the upper side and the lower side of the sealing element; the two first shaft sleeves are matched to extrude the sealing element so that the sealing element is tightly attached to the valve rod and the cavity wall of the inner cavity respectively; the butterfly plate is arranged in the inner cavity and sleeved on the lower side of the valve rod; the butterfly plate is fixedly wrapped with a rubber layer; the rubber layer is positioned between the valve body and the valve rod and is closely attached to the cavity wall of the inner cavity and the valve rod respectively. The utility model discloses a seal structure of butterfly valve, it is sealed through the first axle sleeve of suit and sealing member and realize on butterfly plate cladding rubber layer, reduces the sealed operation degree of difficulty.

Description

Sealing structure of butterfly valve

Technical Field

The utility model relates to a seal structure especially relates to a seal structure of butterfly valve.

Background

At present, a butterfly valve is used for regulating and controlling the medium flow in a pipeline and widely applied to production and life, a butterfly plate and a valve rod of the butterfly valve are main regulating and controlling elements, and the butterfly valve is opened and closed by rotating the valve rod to drive the butterfly valve; thus, the sealing is very important for butterfly valves; the existing sealing is realized by adopting the following structure: the butterfly valve is characterized in that rubber is locally vulcanized on a valve body of the butterfly valve, and a butterfly plate of the butterfly valve is sleeved on the valve body and is hermetically matched with the rubber sulfide to realize sealing; however, the valve body is vulcanized by locally vulcanizing rubber, so that the difficulty of vulcanization is high, namely the difficulty of realizing sealing operation is high.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a sealing structure of a butterfly valve, which is sealed by a first shaft sleeve of a suit and a sealing element and a butterfly plate cladding rubber layer, and reduces the difficulty of sealing operation.

The purpose of the utility model is realized by adopting the following technical scheme:

a sealing structure of a butterfly valve comprises a valve body, a butterfly plate, a valve rod, a sealing piece and two first shaft sleeves; the valve body is provided with an inner cavity; the valve rod penetrates through the inner cavity; both the first bushings and the seal are located within the internal cavity; the sealing element is sleeved on the upper side of the valve rod; the two first shaft sleeves are respectively sleeved on the valve rod and are respectively arranged on the upper side and the lower side of the sealing element; the two first shaft sleeves are matched to extrude the sealing element so that the sealing element is tightly attached to the valve rod and the cavity wall of the inner cavity respectively; the butterfly plate is arranged in the inner cavity and sleeved on the lower side of the valve rod; a rubber layer is fixedly coated outside the butterfly plate; the rubber layer is positioned between the valve body and the valve rod, and the rubber layer is closely attached to the cavity wall of the inner cavity and the valve rod respectively.

Further, the sealing element is an O-shaped sealing ring.

Furthermore, the valve rod is provided with an annular clamping groove extending around the circumferential direction of the valve rod; the sealing structure further comprises a limiting piece, and the limiting piece is positioned on the upper sides of the first shaft sleeve and the sealing piece; one end of the limiting piece is detachably mounted on the valve body, and the other end of the limiting piece is inserted into the annular clamping groove; the limiting piece is used for abutting against the first shaft sleeve.

Further, the limiting piece is fixed on the valve body through a screw.

Furthermore, the limiting part is a limiting sheet.

Furthermore, the sealing structure of the butterfly valve also comprises a second shaft sleeve, and the second shaft sleeve is sleeved on the valve rod and is positioned in the inner cavity; the second shaft sleeve is located between the second shaft sleeve and the butterfly plate.

Furthermore, the valve rod extends out of the lower surface of the butterfly plate, a third shaft sleeve is sleeved on the part, extending out of the butterfly plate, of the valve rod, and the third shaft sleeve is located in the inner cavity.

Further, the rubber layer comprises a first section, a second section and a third section which are sequentially connected from top to bottom; the radial thickness of the first section and the third section is thicker than the radial thickness of the second section.

Further, the rubber layer completely covers the outer side face of the butterfly valve; the outer surface of the rubber layer is closely attached to the cavity wall of the inner cavity, the rubber layer is located on the upper side and the lower side of the butterfly plate and is formed into a first attaching portion and a second attaching portion respectively, and the side face of the first attaching portion and the side face of the second attaching portion are closely attached to the valve rod respectively.

Furthermore, the valve rod is provided with a first transmission section with a polygonal cross section, and the butterfly plate is provided with a second transmission section which is sleeved outside the first transmission section in a matching manner; the cross section of the second transmission section is a polygon with the same shape as the cross section of the first transmission section.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses toward valve rod overcoat establish first axle sleeve and sealing member, two first axle sleeve cooperations extrudees the sealing member makes the sealing member realize sealed tightly closing between the upside of valve rod and the valve body, and again at the outer cladding rubber layer of butterfly plate, the rubber layer realizes sealed tightly closing between the downside of valve rod and the valve body, so, realizes the sealed of butterfly valve, and the equipment is simple, need not to vulcanize the operation to the valve body, reduces the sealed operation degree of difficulty.

Drawings

Fig. 1 is a schematic structural view of a sealing structure of a butterfly valve according to the present invention;

fig. 2 is an enlarged view of a portion a of fig. 1 according to the present invention;

fig. 3 is an enlarged view of a portion B of fig. 1 according to the present invention.

In the figure: 10. a valve body; 11. an inner cavity; 20. a butterfly plate; 30. a valve stem; 40. a seal member; 50. a first bushing; 60. a rubber layer; 61. a first stage; 62. a second stage; 63. a third stage; 64. an outer surface of the rubber layer; 65. a side surface of the first attaching portion; 70. a limiting member; 80. a second shaft sleeve; 90. and a third bushing.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

As shown in fig. 1-3, the sealing structure of the butterfly valve includes a valve body 10 and a butterfly plate 20, the valve body 10 is provided with an inner cavity 11, and a valve rod 30 is inserted into the inner cavity 11; the butterfly plate 20 is arranged in the inner cavity 11 and sleeved on the valve rod 30, the butterfly plate 20 is fixedly wrapped with a rubber layer 60, and the rubber layer 60 can be made of corrosion-resistant materials; the rubber layer 60 is positioned between the valve body 10 and the valve rod 30, and the rubber layer 60 is respectively attached to the cavity wall of the inner cavity 11 and the valve rod 30 in a sealing way; in this way, sealing between the valve body 10 and the valve rod 30 is achieved by the rubber layer 60; further, the butterfly plate 20 is sleeved on the lower side of the valve rod 30, and therefore, the rubber layer 60 realizes sealing between the valve body 10 and the lower side of the valve rod 30; the sealing structure of the butterfly valve further comprises a sealing element 40 and two first shaft sleeves 50 which are both positioned in the inner cavity 11; the sealing element 40 is sleeved on the upper side of the valve rod 30; the two first shaft sleeves 50 are respectively sleeved on the valve rod 30 and are respectively arranged at the upper side and the lower side of the sealing element 40; it should be noted that, in order to ensure the normal use of the butterfly valve, the first shaft sleeve 50 and the valve rod 30 are relatively rotatably disposed, wherein the first shaft sleeve 50 is in clearance fit with the valve rod 30; the two first bushings 50 cooperate to compress the sealing member 40 so that the sealing member 40 is in tight engagement with the valve stem 30 and the walls of the interior chamber 11, respectively; so, under the cooperation extrusion of two first axle sleeves 50, sealing member 40 warp, and makes sealing member 40 close the laminating with the chamber wall of valve rod 30 and inner chamber 11 respectively, realizes the sealed between the upside to valve body 10 and valve rod 30 to have better sealed effect, the seal structure equipment of this butterfly valve is simple, need not to vulcanize the operation to valve body 10, reduces sealed operation degree of difficulty.

Secondly, the existing valve rod 30 is provided with a groove, and the sealing element 40 is arranged in the groove to realize installation, but in the mode, when the situation of water leakage of the butterfly valve is found every time, the sealing element 40 needs to be replaced by integrally disassembling and assembling the butterfly valve, so that the operation is complex; in the embodiment, the two first shaft sleeves 50 are matched with the extrusion sealing element 40, when water leakage of the butterfly valve is found, only a new sealing element 40 and the first shaft sleeve 50 outside are required to be directly driven into the inner cavity 11 again in sequence, and the valve rod 30 has a certain length, so that the operation can be continued for several times, the integral disassembly and assembly of the butterfly valve are not required to be carried out until no space is left in the inner cavity 11 to continuously accommodate the new first shaft sleeve 50 and the new sealing element 40, and then the first shaft sleeve 50 and the sealing element 40 in the inner cavity 11 are taken out, namely, the integral disassembly and assembly of the butterfly valve are not required to be carried out when water leakage is found each time; moreover, the two first shaft sleeves 50 are matched with each other to extrude the sealing element 40, so that the sealing element 40 is tightly attached to the valve body 10 and the valve rod 30 respectively, and the sealing effect is better.

Specifically, the sealing element 40 is an O-shaped sealing ring, the O-shaped sealing ring is sleeved on the valve rod 30, and the upper surface and the lower surface of the O-shaped sealing ring are respectively attached to the two first shaft sleeves 50, when the O-shaped sealing ring is assembled, the two first shaft sleeves 50 are compressed to extrude the O-shaped sealing ring, the O-shaped sealing ring is transversely deformed, and then the sealing attachment between the cavity wall of the inner cavity 11 and the valve body 10 is realized.

In order to prevent the first shaft sleeve 50 from flying out of the inner cavity 11 under the action of external water pressure in the using process, further, the valve rod 30 is provided with an annular clamping groove extending around the circumference of the valve rod; the sealing structure further comprises a limiting member 70, wherein the limiting member 70 is positioned on the upper sides of the first shaft sleeve 50 and the sealing member 40; one end of the limiting piece 70 is detachably mounted on the valve body 10, so that when a new sealing piece 40 and a new first shaft sleeve 50 need to be drilled, the limiting piece 70 only needs to be detached; the other end of the limiting piece 70 is inserted into the annular clamping groove; it should be noted that the ring shape of the annular clamping groove refers to a closed structure of the extending track of the annular clamping groove, and the ring shape is not limited to a circle, an ellipse, a square, etc.; thus, the annular clamping groove can ensure that the limiting piece 70 can not obstruct the rotation of the valve rod 30; the limiting member 70 is used to abut against the first shaft sleeve 50, so as to prevent the first shaft sleeve 50 from flying out.

Specifically, the position limiting member 70 is fixed on the valve body 10 by a screw, that is, a through hole is formed in the position limiting member 70, a screw hole is formed in the valve body 10, a rod portion of the screw passes through the through hole and is screwed with the screw hole, and by screwing the screw, an end portion of the screw is matched with the valve body 10, so that the position limiting member 70 is fixed.

The limiting member 70 may be a limiting rod or a limiting plate, and the limiting member 70 in this embodiment is preferably a limiting sheet, and the thickness of the limiting sheet is smaller than that of the limiting rod and the limiting plate, so that the overall volume of the butterfly valve can be reduced.

In order to improve the smooth rotation of the valve rod 30, the sealing structure of the butterfly valve preferably further comprises a second shaft sleeve 80, wherein the second shaft sleeve 80 is sleeved on the valve rod 30 and is positioned in the inner cavity 11; the second bushing 80 is located between the second bushing 80 and the butterfly plate 20.

More preferably, the valve rod 30 extends out of the lower surface of the butterfly plate 20, and a portion of the valve rod 30 extending out of the butterfly plate 20 is sleeved with a third shaft sleeve 90, and the third shaft sleeve 90 is located in the inner cavity 11; in this manner, the function of stabilizing the valve rod 30 is achieved by the third boss 90.

Specifically, as shown in fig. 2, the rubber layer 60 includes a first section 61, a second section 62 and a third section 63 connected in sequence from top to bottom; the radial thickness D1 of the first section 61 and the radial thickness of the third section 63 are both thicker than the radial thickness D3 of the second section 62; in this way, the first section 61 and the third section 63 ensure a better fit of the rubber layer 60 to the valve body 10, relative to the way the rubber layer 60 is uniformly thick throughout.

The radial thickness D1 of the first section 61 and the radial thickness D2 of the third section 63 can be set to be the same, so that the extrusion forces on the upper side and the lower side of the rubber layer 60 are substantially the same, and the problem that the other section cannot be attached to the valve body 10 due to the fact that one section is too thick is avoided.

Specifically, the rubber layer 60 completely covers the outer side of the butterfly valve; the outer surface 64 of the rubber layer is closely attached to the cavity wall of the inner cavity 11, the parts of the rubber layer 60 positioned on the upper side and the lower side of the butterfly plate 20 are respectively formed into a first attaching part and a second attaching part, and the side surface 65 of the first attaching part and the side surface of the second attaching part are respectively closely attached to the valve rod 30; due to the coating rubber layer 60, the butterfly plate 20 can be made of nodular cast iron with higher strength and lower cost instead of expensive materials such as stainless steel and bronze adopted by the existing butterfly plate 20, and the problem of deformation of the butterfly plate 20 caused by uneven acting force of the butterfly plate 20 on the valve rod 30 is solved by only performing anticorrosion treatment on the surface of the nodular cast iron and then coating rubber.

Further, the valve rod 30 has a first transmission section with a polygonal cross section, and the butterfly plate 20 has a second transmission section sleeved outside the first transmission section in a matching manner; the cross section of the second transmission section is a polygon with the same shape as the cross section of the first transmission section; therefore, the transmission between the butterfly plate 20 and the valve rod 30 is realized through the limitation of the polygonal corners, and the butterfly plate 20 and the valve rod 30 are connected in a non-pin connection mode and adopt the design of the coating rubber layer 60, so that the phenomenon of leakage of the position of the valve rod 30 caused by corrosion of media to the butterfly valve after long-time use is avoided, and the service life of the butterfly valve is prolonged.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. The utility model provides a seal structure of butterfly valve which characterized in that: the butterfly valve comprises a valve body, a butterfly plate, a valve rod, a sealing element and two first shaft sleeves; the valve body is provided with an inner cavity; the valve rod penetrates through the inner cavity; both the first bushings and the seal are located within the internal cavity; the sealing element is sleeved on the upper side of the valve rod; the two first shaft sleeves are respectively sleeved on the valve rod and are respectively arranged on the upper side and the lower side of the sealing element; the two first shaft sleeves are matched to extrude the sealing element so that the sealing element is tightly attached to the valve rod and the cavity wall of the inner cavity respectively; the butterfly plate is arranged in the inner cavity and sleeved on the lower side of the valve rod; a rubber layer is fixedly coated outside the butterfly plate; the rubber layer is positioned between the valve body and the valve rod, and the rubber layer is closely attached to the cavity wall of the inner cavity and the valve rod respectively.

2. A sealing structure of a butterfly valve according to claim 1, wherein: the sealing element is an O-shaped sealing ring.

3. A sealing structure of a butterfly valve according to claim 1, wherein: the valve rod is provided with an annular clamping groove extending around the circumferential direction of the valve rod; the sealing structure further comprises a limiting piece, and the limiting piece is positioned on the upper sides of the first shaft sleeve and the sealing piece; one end of the limiting piece is detachably mounted on the valve body, and the other end of the limiting piece is inserted into the annular clamping groove; the limiting piece is used for abutting against the first shaft sleeve.

4. A sealing structure of a butterfly valve according to claim 3, wherein: the limiting piece is fixed on the valve body through a screw.

5. A sealing structure of a butterfly valve according to claim 3, wherein: the limiting piece is a limiting piece.

6. A sealing structure of a butterfly valve according to claim 1, wherein: the sealing structure of the butterfly valve further comprises a second shaft sleeve, and the second shaft sleeve is sleeved on the valve rod and is positioned in the inner cavity; the second shaft sleeve is located between the second shaft sleeve and the butterfly plate.

7. A sealing structure of a butterfly valve according to claim 6, wherein: the valve rod extends out of the lower surface of the butterfly plate, a third shaft sleeve is sleeved on the part, extending out of the butterfly plate, of the valve rod, and the third shaft sleeve is located in the inner cavity.

8. A sealing structure of a butterfly valve according to claim 1, wherein: the rubber layer comprises a first section, a second section and a third section which are sequentially connected from top to bottom; the radial thickness of the first section and the third section is thicker than the radial thickness of the second section.

9. A sealing structure of a butterfly valve according to claim 1, wherein: the rubber layer completely covers the outer side face of the butterfly valve; the outer surface of the rubber layer is closely attached to the cavity wall of the inner cavity, the rubber layer is located on the upper side and the lower side of the butterfly plate and is formed into a first attaching portion and a second attaching portion respectively, and the side face of the first attaching portion and the side face of the second attaching portion are closely attached to the valve rod respectively.

10. A sealing structure of a butterfly valve according to claim 1, wherein: the valve rod is provided with a first transmission section with a polygonal cross section, and the butterfly plate is provided with a second transmission section sleeved outside the first transmission section in a matching manner; the cross section of the second transmission section is a polygon with the same shape as the cross section of the first transmission section.