CN217634430U

CN217634430U - Winding gasket and valve with same

Info

Publication number: CN217634430U
Application number: CN202221822154.5U
Authority: CN
Inventors: 许如俊; 徐佳佳; 陶蓉; 周芃; 窦伯韬; 凌秀生
Original assignee: Jiangsu Taili Mechanical Technology Co ltd
Current assignee: Jiangsu Taili Mechanical Technology Co ltd
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-10-21
Anticipated expiration: 2032-07-15

Abstract

The utility model provides a winding gasket and have its valve, the gasket includes: the gasket comprises an inner ring, a gasket body and an outer ring which are sequentially sleeved from inside to outside; the gasket further includes: and the sealing layer is coated on the outer surface of the inner ring, and two end surfaces of the inner ring, which are in contact with the flange, are respectively provided with saw teeth parts protruding outwards. The two end surfaces of the inner ring of the wound gasket, which are contacted with the flange, are respectively provided with the sawtooth parts which protrude outwards, so that the best sealing performance can be achieved by using the minimum compression load; the sealing layer avoids the direct contact between the inner ring and the flange, and can be reliably and tightly combined to protect the flange from being damaged; meanwhile, the sealing layer, the inner ring and the gasket body form two seals, so that the flange pipeline is safer and more reliable in use.

Description

Winding gasket and valve with same

Technical Field

The utility model belongs to the technical field of the winding gasket is sealed, concretely relates to low load graphite winding gasket and have its valve.

Background

At present, gaskets in the ultralow temperature field are monopolized by countries such as America, japan, korea and the like. When an LNG ship is built or stored and transported, a large number of imported low-temperature gaskets are used, and the LNG transportation and storage cost in China is directly influenced due to the fact that the imported gaskets are long in supply period and high in price.

The traditional metal graphite wound gasket is applied to a pipeline flange and can be effectively sealed only by reaching higher pre-compression stress. The flange is damaged due to over-tightening, and the replacement of the gasket and the replacement of the flange at the same time result in high maintenance cost and long maintenance time.

The prior art has at least the following problems:

the metal graphite wound gasket adopts higher pre-compression stress to achieve sealing, but the flange is easy to damage;

the wound gasket is easy to cause the gasket to loose and lose efficacy due to creep deformation, and the sealing performance is reduced in the ultralow-temperature environment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least, provide a winding gasket and have its valve.

One aspect of the present invention provides a wound gasket. The gasket includes:

the gasket comprises an inner ring, a gasket body and an outer ring which are sequentially sleeved from inside to outside; two end faces of the inner ring, which are in contact with the flange sealing face, are respectively provided with outwards-protruding saw tooth parts; the gasket further includes: and the sealing layer is coated on the outer surface of the inner ring.

Optionally, the tooth tips of the saw teeth of the saw tooth portion are flat surfaces, and the tooth tips are flush with each other and are equidistant from each other.

Optionally, the sawtooth part includes a plurality of first sawteeth and a plurality of second sawteeth, the first sawteeth and the second sawteeth are alternately arranged, a tooth tip of each sawtooth is a plane, and a tooth tip of the first sawteeth is higher than a tooth tip of the second sawteeth;

the distance between the tooth tips of the first sawtooth and the second sawtooth is equal.

Optionally, the included angle between every two adjacent saw teeth is not greater than 90 °.

Optionally, the gasket body includes a metal layer and a non-metal filling layer, and the metal layer and the non-metal filling layer are sequentially arranged at intervals; the inner side and the outer side of the gasket body are respectively provided with a plurality of metal layers.

Optionally, the gasket body has a V-shaped structure with an opening facing the center of the wound gasket along a radial cross section of the gasket body, and the thickness of the gasket body is greater than the thickness of the inner ring and the thickness of the outer ring respectively.

Optionally, the gasket body is provided with a fixing ring on both side surfaces contacting the flange.

Optionally, the thickness of the gasket body is equal to the common thickness of the inner ring and the sealing layer.

Optionally, an included angle of the V-shaped structure is greater than or equal to 90 °.

Another aspect of the present invention provides a valve. Including the wound gasket as described above.

In the winding gasket provided by the embodiment of the utility model, the two end surfaces of the inner ring, which are contacted with the flange, are respectively provided with the saw tooth parts which protrude outwards, and the sealing layer is coated on the outer surface of the inner ring, so that the winding gasket can achieve the sealing effect only by smaller pretightening force; the inner ring, the sealing layer and the gasket body form two seals, and the sealing effect in a low-temperature environment is guaranteed.

Drawings

Fig. 1 is a schematic structural view of a wound gasket portion according to an embodiment of the present invention;

FIG. 2 is a schematic view of a wound gasket portion according to another embodiment of the present invention;

fig. 3 is a schematic structural view of a wound gasket portion according to another embodiment of the present invention.

In the figure:

100. an inner ring; 101. a serration; 111. a first saw tooth; 112. a second saw tooth;

200. a sealing layer; 300. a gasket body; 301. a metal layer; 302. a non-metallic filler layer; 303. a fixing ring; 400. and (4) an outer ring.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

At present, LNG needs to be cooled to-162 ℃ in the storage and transportation processes to be condensed into liquid, and China has great demand on LNG, so that the demand on ultra-low temperature gaskets is increasing. In order to break monopoly on the ultra-low temperature gasket in the countries of the united states, the China, the Korean and the like, the applicant of the application develops the LNG ultra-low temperature winding gasket through independent innovation.

As shown in fig. 1 to 3, a wound gasket, the gasket comprising: the inner ring 100, the gasket body 300 and the outer ring 400 are sleeved from inside to outside in sequence; two end faces of the inner ring 100, which are in contact with the sealing surface of the flange, are respectively provided with outwards-protruding sawtooth parts 101; the gasket further includes: a sealing layer 200, wherein the sealing layer 200 is coated on the outer surface of the inner ring 100.

Specifically, the outer ring mainly serves as positioning, and preferably, the outer ring can be made of metal materials such as stainless steel and carbon steel. The sealing layer is hermetically wrapped on the outer surface of the inner ring, and the sealing layer can be made of one or more thin plate material layers of flexible graphite, a non-asbestos plate, an asbestos plate, polytetrafluoroethylene PTFE (polytetrafluoroethylene) or a mica plate; preferably, the sealing layer is made of Polytetrafluoroethylene (PTFE). The sealing layer prevents the sealing surface of the flange from directly contacting with the two end surfaces of the inner ring, so that the winding gasket and the flange can be reliably and tightly combined, and the flange is protected from being damaged. The polytetrafluoroethylene PTFE improves the creep resistance and the heat conduction performance of the wound gasket, and is suitable for the ultralow temperature environment.

Preferably, the inner ring 100 is made of any one of mild steel, carbon steel, copper, stainless steel, titanium alloy or alloy aluminum plate; more preferably, the inner ring 100 is made of titanium alloy, and has better tensile property and rebound resilience. The inner ring is pressed to generate resilience force, so that the polytetrafluoroethylene PTFE can be tightly attached to the flange sealing surface, and the sealing performance is improved.

In this embodiment, the serrations 101 improve the spring rate of the wound gasket. Inner ring 100 constitutes first seal structure with sealing layer 200, and gasket body 300 constitutes second seal structure, and this embodiment adopts double seal structure, and when gasket body compressive strength was less than the pretightning force and became invalid, the first seal structure that inner ring and sealing layer constitute can effectively solve sealed leakage problem, has improved sealing performance.

In the flange seal that uses bolt-up, the pretightning force can all be effectively reduced to the second seal structure of gasket body and zigzag shape's inner ring and the first seal structure of sealing layer for the winding gasket can reach best sealing performance under minimum compression load, is applicable to the long-term lasting sealed of ultra-low temperature environment.

Illustratively, as shown in fig. 1, the tips of the teeth of the saw teeth 101 are flat, and the tips are flush and are equidistant from adjacent tips.

Specifically, in the structure of the sawtooth part 101 proposed in this embodiment, the tooth tip of the sawtooth part 101 is a plane, so as to improve the rebound resilience of the inner ring 100; secondly, the pressure bearing capacity of the inner ring 100 is considered; the sawtooth part 101 increases the rebound rate, and the tooth tip is a plane, so that the bearing capacity is increased, and the processing is easy.

Illustratively, as shown in fig. 2 and 3, the sawtooth part 101 includes a plurality of first sawteeth 111 and a plurality of second sawteeth 112, the first sawteeth 111 and the second sawteeth 112 are alternately arranged, and the tooth tip of each of the sawteeth is a plane, the tooth tip of the first sawteeth 111 is slightly higher than the tooth tip of the second sawteeth 112; the tips of the first saw tooth 111 and the second saw tooth 112 adjacent to each other are equidistant.

Specifically, the present embodiment proposes another structure of the serrations 101, which reduces the contact area between the inner ring 100 and the flange sealing surface and increases the spring rate.

Illustratively, as shown in fig. 1-3, each adjacent pair of saw teeth includes an included angle of no more than 90 °.

Specifically, the included angle between every two adjacent sawteeth is not more than 90 degrees, meanwhile, the angle of the tooth tips of the sawteeth is not more than 90 degrees, the contact area between the top ends of the sawteeth and the flange sealing surface is reduced, and the compression rate and the rebound rate are improved.

Illustratively, as shown in fig. 1 to 3, the gasket body 300 includes a metal layer 301 and a non-metal filling layer 302, where the metal layer 301 and the non-metal filling layer 302 are sequentially disposed at intervals; the gasket body 300 is provided with a plurality of metal layers 301 on the inner side and the outer side, respectively.

Specifically, the metal layer 301 is made of metal materials such as stainless steel, the filling material of the nonmetal filling layer 302 is made of flexible materials such as high-carbon graphite strips, and therefore the low-temperature resistance of the wound gasket is better. Preferably, the thickness of the non-metal filling layer 302 is 0.3mm to 1.0mm, and more preferably, the thickness of the non-metal filling layer 302 is 0.5mm; the width of the nonmetal filling layer 302 is 4.5 mm-6.5 mm, and more preferably, the width of the nonmetal filling layer 302 is 5.5mm; the metal layer 301 and the nonmetal filling layer 302 are formed by rolling through special winding equipment.

In this embodiment, press from both sides tightly the winding gasket between the flange seal face, the gasket body receives the extrusion, and the gasket body utilizes the resilience of metal level and the leakproofness of nonmetal filling layer, makes the utility model discloses has good sealed effect.

For example, as shown in fig. 1 to 3, the cross section of the gasket body 300 along the radial direction is a V-shaped structure with an opening facing the center of the wound gasket, and the thickness of the gasket body 300 is greater than the thickness of the inner ring 100 and the outer ring 400 respectively. Preferably, the included angle of the V-shaped structure is greater than or equal to 90 degrees.

Specifically, a plurality of metal layers on the inner side and the outer side of the gasket body are reinforced and fixed, and the resilience of the gasket body is increased by the stainless steel V-shaped structure. Gasket body 300 also can be the opening orientation along its radial cross section W or chevron structure etc. of winding gasket center department as long as the structure that can increase gasket body 300 resilience can all be applied to the utility model discloses a gasket body 300 resilience's structure is provided with the utility model discloses a gasket body is provided with the opening orientation. More preferably, the included angle of the V-shaped structure is 90 degrees, and the V-shaped structure is easy to process.

The inner periphery of the outer ring 400 is provided with a groove (not shown in the figures), the outer side of the gasket body 300 can be embedded into the groove, the outer periphery of the inner ring 100 is provided with a convex ring (not shown in the figures) protruding outwards, and the convex ring is abutted with the V-shaped structure on the inner side of the gasket body 300.

Illustratively, as shown in fig. 1 to 3, both side surfaces of the gasket body 300 contacting the flange are provided with fixing rings 303.

Specifically, the material of the fixing ring 303 is a metal material such as stainless steel, so that the compressive strength of the gasket body is improved. The metal layer can be formed by the metal band after stretching, and the metal band can be the steel band, and elasticity is better after stretching, through V type shaping, turns to press into the 90 degrees angles of V type again, makes the metal layer have better elasticity recovery performance.

The specific manufacturing method of the gasket body in the embodiment comprises the following steps: the gasket body towards the inner ring of the inner ring is idle-wound more than 3 circles of steel bands, the V-shaped steel bands are fixed through spot welding, then graphite filling strips are added, a circle of V-shaped steel band is added, a circle of graphite strips is added, after the graphite strips are wound to a specified size, the graphite strips are idle-wound more than 3 circles of steel bands, the V-shaped steel bands are spot-welded, and after the graphite strips are fixed, fixing rings are added, so that the compressive strength of the gasket body is improved. In the embodiment, the steel strip is subjected to V-shaped stretching, so that the gasket body has certain flexibility and elasticity, and then the nonmetal filling material with low temperature resistance and good elasticity is selected and wound by a special device clockwise interlayer to form the gasket.

Illustratively, as shown in fig. 3, the thickness of the gasket body 300 is equal to the common thickness of the inner ring 100 and the seal layer 200.

Specifically, at this time, the thicknesses of the inner ring 100 and the outer ring 400 may be equal or unequal, and the thickness of the gasket body 300 is respectively greater than the thicknesses of the inner ring 100 and the outer ring 400, so that after the outer surface of the inner ring 100 is covered with the sealing layer 200, the overall thickness of the inner ring 100 and the sealing layer 200 may be equal to the thickness of the gasket body 300 or slightly greater than the thickness of the gasket body 300, and at this time, the inner ring 100 and the sealing layer 200 form a first sealing structure and a second sealing structure formed by the gasket body 300 forms a double sealing structure. The winding gasket of this embodiment carries out the in-process of sealing work, and the acid and alkali material is at first through the inner ring of winding gasket, and the sealing layer of inner ring surface, for example polytetrafluoroethylene PTFE have the performance of acid and alkali-resistance to can reduce the acid and alkali material and see through the winding gasket, with the volume of the contact of the high carbon graphite strip in the gasket body, reduce the possibility that high carbon graphite strip was dissolved, strengthen sealed effect.

The utility model discloses a further embodiment gasket body 300 thickness is greater than respectively outer ring 400 thickness is greater than simultaneously the common thickness of inner ring 100 and sealing layer 200, as shown in fig. 1 and 2, the inner ring with the sealing layer constitutes the second way seal structure that first seal structure and gasket body constitute and constitutes double seal structure, has improved sealed effect greatly, has effectively solved when the winding is sealed because compressive strength is less than the problem that the pretightning force became invalid the time sealed leakage.

The utility model discloses a valve adopts winding gasket as above more safe and reliable in LNG seal of pipe joints uses.

It is to be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A wound gasket, said gasket comprising: the gasket comprises an inner ring, a gasket body and an outer ring which are sequentially sleeved from inside to outside; the flange sealing structure is characterized in that two end surfaces of the inner ring, which are in contact with the flange sealing surface, are respectively provided with a sawtooth part which protrudes outwards; the gasket further includes: and the sealing layer is coated on the outer surface of the inner ring.

2. The wrappable spacer of claim 1 wherein each tooth tip of each of said teeth of said serrated portion is planar, each of said tooth tips being flush and each adjacent tooth tip being equidistant.

3. The wound gasket of claim 1, wherein the serrated portion includes a plurality of first serrations and a plurality of second serrations, the first serrations and the second serrations being alternately arranged, and a tip of each of the serrations being a flat surface, the tip of the first serration being higher than the tip of the second serration;

4. Winding shim according to any one of claims 1 to 3, wherein the included angle between adjacent saw teeth is not more than 90 °.

5. The wound gasket of any of claims 1 to 3 wherein said gasket body includes a metal layer and a non-metallic filler layer, said metal layer and non-metallic filler layer being spaced apart in sequence;

the inner side and the outer side of the gasket body are respectively provided with a plurality of metal layers.

6. The winding shim of any one of claims 1 to 3, wherein the shim body has a V-shaped configuration in cross section along a radial direction thereof, opening toward a center of the winding shim, and a thickness of the shim body is greater than a thickness of each of the inner ring and the outer ring.

7. The wound gasket of claim 6 wherein the gasket body is provided with securing rings on both side surfaces in contact with the flange.

8. The wound gasket of claim 6 wherein the thickness of the gasket body is equal to the common thickness of the inner ring and the sealing layer.

9. Winding shim according to claim 7 or 8, characterised in that the included angle of the V-shaped structure is equal to or greater than 90 °.

10. A valve comprising a wound gasket according to any one of claims 1 to 9.