CN215370948U - Sealing gasket, combined sealing structure and sealing plug - Google Patents

Abstract

The utility model relates to a sealing gasket, a combined sealing structure and a sealing plug. The body is provided with a first end face, a second end face and a first outer wall face, wherein the first end face and the second end face are opposite, and the first outer wall face is connected with the first end face and the second end face. The first end face is used for being in sealing interference fit with a first step face of the second joint pipe. More than two first convex parts arranged at intervals are arranged on the first outer wall surface. On one hand, in the butt joint installation process of the sealing gasket and the second joint pipe, the installation deviation between the first joint pipe and the second joint pipe can be compensated, and the assembly operation is convenient; on the other hand, the sealed conflict cooperation of first terminal surface and first step face forms plane seal as the primary seal section, and the sealed conflict cooperation of the first convex part of two above all forms two above annular line sealings with the first internal face of second joint pipe simultaneously, constitutes back seal section, can further strengthen the leakproofness of structure, can reduce the leakage risk that the installation deviation brought simultaneously, can guarantee sealing performance.

Description

Sealing gasket, combined sealing structure and sealing plug

Technical Field

The utility model relates to the technical field of fluid sealing devices, in particular to a sealing gasket, a combined sealing structure and a sealing plug.

Background

Conventionally, seals applied to fluids (including gases and liquids) are classified into a dynamic seal type and a static seal type. The static sealing mode has various modes, including, for example, a flat gasket sealing mode, an O-ring sealing mode, a packing sealing mode, a lip sealing mode and the like, and the sealing surface is mainly in a plane sealing structure or a line sealing structure.

At present, the sealing method of fluid such as liquid, gas, etc. is usually a flat gasket sealing method or an O-ring sealing method. Wherein, to the flat gasket sealing mode who chooses for use, the flat gasket generally uses with the sealing line cooperation on the connection structure to form sealedly, the flat gasket need exert the effort through both sides connection structure (for example flange), make the flat gasket press from both sides tightly between the connection structure who is located flat gasket both sides, in addition, can make the plane seal inefficacy when too big or the undersize of clamp force to the flat gasket, the flat gasket seals simultaneously and requires highlyr to the plane of joint face, in addition, need fix gasket and joint during the flat gasket installation, the flat gasket drops easily during the installation, it is less because of the sealed terminal surface area of operating mode restriction flat gasket, the leakproofness is relatively weak.

And secondly, for the selected O-shaped ring sealing mode, the O-shaped ring sealing mode is a linear sealing mode, and the sealing property is superior to that of a plane sealing mode. However, the O-ring needs to be provided with the mounting groove adapted to the O-ring at the installed connecting end, and the two connecting ends need to be ensured to be concentrically mounted with the two connecting ends in the assembling process, if the O-ring cannot be retained in the mounting groove in the mounting process, the O-ring is extremely easy to cause sealing failure.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to overcome the defects in the prior art, and to provide a sealing gasket, a combined sealing structure and a sealing plug, which can improve the sealing performance and facilitate the assembling operation.

The technical scheme is as follows: a gasket, comprising: the body is provided with a first end face, a second end face and a first outer wall face, wherein the first end face and the second end face are opposite, and the first outer wall face is connected with the first end face and the second end face; the body is also provided with a through hole extending from the first end surface to the second end surface, and the body is sleeved on a first joint pipe through the through hole; be equipped with two above first convex parts that the interval set up on the first outer wall face, first convex part winds the circumference setting of through-hole, first convex part be used for with the sealed conflict cooperation of first internal face of second joint pipe, two above first convex parts arrive the distance of the first central line of through-hole is in first terminal surface extremely crescent in the direction of second terminal surface.

When the sealing gasket is assembled with the first joint pipe and the second joint pipe to form the combined sealing structure, the sealing gasket is firstly sleeved on the end part of the first joint pipe through the through hole, then the first joint pipe is arranged in the second joint pipe, so that the first end surface of the sealing gasket is in sealing contact with the first step surface of the second joint pipe, for example, and more than two first convex parts on the first outer wall surface are in sealing contact with the first inner wall surface of the second joint pipe. Therefore, on one hand, the distance S from the more than two first convex parts to the first central line of the through hole is gradually increased in the direction from the first end face to the second end face, namely the first outer wall surface of the body is integrally in a shape similar to a cone, the cone plays a self-positioning role in the butt joint installation process of the sealing gasket and the second joint pipe, the installation deviation between the first joint pipe and the second joint pipe can be compensated in the installation process, and the assembly operation is more convenient; on the other hand, the sealed conflict cooperation of first terminal surface and the first step face of second joint pipe forms plane seal as the primary seal section, and the sealed conflict cooperation of the first convex part of two above all with the first internal face of second joint pipe simultaneously forms two above annular line sealings, and two above annular line sealings constitute the back seal section, can further strengthen the leakproofness of structure, can reduce the leakage risk that the installation deviation brought simultaneously, can guarantee sealing performance.

In one embodiment, the first end surface is a flat surface; and a first wire groove arranged around the circumferential direction of the through hole is formed in the first end surface.

In one embodiment, the first outer wall surface comprises a first section wall surface and a second section wall surface which are arranged in sequence along a first central line direction of the through hole, and the first section wall surface is closer to the first end surface relative to the second section wall surface; a second wire groove arranged around the circumferential direction of the through hole is formed in the first section of wall surface; the two or more first protrusions are provided on the second section wall surface.

In one embodiment, a cross section of the first convex part is taken through a first central line of the through hole, and a point farthest from the first central line on the cross section is taken as a p point; the connecting line of more than two p points on the same section is obliquely arranged relative to the first central line, and the inclination angle is a; the inclination angle of the first inner wall surface relative to the axis of the second joint pipe is b, and a is the same as b.

In one embodiment, a cross section of the first protrusion is taken through a first center line of the through hole, and the cross section is a semicircular surface, a triangular surface, a semi-elliptical surface, a rectangular surface or a trapezoidal surface.

In one embodiment, the body includes an inner portion and an outer portion disposed circumferentially about the inner portion; the inner portion is a hard portion and the outer portion is an elastic portion.

In one embodiment, the inner part comprises a connecting part connected with the outer part and a hard piece arranged on the connecting part; or the inner side part is made of hard materials, and the outer side part is made of elastic materials which are arranged on the periphery of the inner side part in a hot melting mode.

In one embodiment, the wall of the through hole is provided with two or more second protrusions arranged at intervals, the second protrusions are arranged circumferentially around the wall of the through hole, and the second protrusions are used for being in sealing interference fit with the second outer wall surface of the first joint pipe.

The combined sealing structure comprises the sealing gasket, a first joint pipe and a second joint pipe, and the body is sleeved on the first joint pipe through the through hole; the first convex part is in sealing interference fit with the first inner wall surface.

When the sealing gasket, the first joint pipe and the second joint pipe are assembled to form the combined sealing structure, the sealing gasket is firstly sleeved on the end part of the first joint pipe through the through hole, then the first joint pipe is installed in the second joint pipe, so that the first end surface of the sealing gasket is in sealing contact with the first step surface of the second joint pipe, and more than two first convex parts on the first outer wall surface are in sealing contact with the first inner wall surface of the second joint pipe. Therefore, on one hand, the distance S from the more than two first convex parts to the first central line of the through hole is gradually increased in the direction from the first end face to the second end face, namely the first outer wall surface of the body is integrally in a shape similar to a cone, the cone plays a self-positioning role in the butt joint installation process of the sealing gasket and the second joint pipe, the installation deviation between the first joint pipe and the second joint pipe can be compensated in the installation process, and the assembly operation is more convenient; on the other hand, the sealed conflict cooperation of first terminal surface and the first step face of second joint pipe forms plane seal as the primary seal section, and the sealed conflict cooperation of the first convex part of two above all with the first internal face of second joint pipe simultaneously forms two above annular line sealings, and two above annular line sealings constitute the back seal section, can further strengthen the leakproofness of structure, can reduce the leakage risk that the installation deviation brought simultaneously, can guarantee sealing performance.

A sealing plug comprises a main body, wherein the main body is provided with a third end face, a fourth end face and a third outer wall face, the third end face and the fourth end face are opposite, and the third outer wall face is connected with the third end face and the fourth end face; be equipped with two or more third convex parts that the interval set up on the third outer wall face, the third convex part is around the circumference setting of the second central line of main part, the third convex part be used for with the sealed conflict cooperation of second internal face of third joint pipe, the distance of two or more third convex parts to the second central line is in the third terminal surface extremely gradually increase in the direction of fourth terminal surface.

When the sealing plug and the third joint pipe are assembled to form the combined sealing structure, the sealing plug is arranged in the third joint pipe, so that the third end surface of the sealing plug is in sealing contact with the third step surface of the third joint pipe, and more than two third convex parts on the third outer wall surface are in sealing contact with and matched with the third inner wall surface of the third joint pipe. Therefore, on one hand, the distance from the more than two third convex parts to the second central line is gradually increased in the direction from the first end face to the second end face, namely the whole third outer wall surface of the main body is similar to a cone shape, the cone shape plays a self-positioning role in the butt joint installation process of the sealing plug and the third joint pipe, the installation deviation between the sealing plug and the third joint pipe can be compensated in the installation process, and the assembly operation is more convenient; on the other hand, the sealed conflict cooperation of third terminal surface and third step face forms plane seal as the primary seal section, and the sealed conflict cooperation of third convex part more than two all with the third internal face simultaneously forms more than two annular line sealings, and the annular line seal more than two constitutes the back seal section, can further strengthen the leakproofness of structure, can reduce the leakage risk that the installation deviation brought simultaneously, can guarantee sealing performance.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a cross-sectional view of a first centerline of a gasket through a through-hole according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 at A;

FIG. 3 is a perspective view of a gasket according to an embodiment of the utility model;

FIG. 4 is a perspective view of a gasket according to another embodiment of the present invention;

FIG. 5 is a cross-sectional view through a first centerline of a through-hole of a unitized seal structure of one embodiment of the present invention;

FIG. 6 is an enlarged schematic view of FIG. 5 at B;

fig. 7 is a schematic structural diagram of a sealing plug according to an embodiment of the present invention;

fig. 8 is an enlarged schematic view at C of fig. 7.

10. A body; 11. a first end face; 111. a first wire slot; 12. a second end face; 13. a first outer wall surface; 131. a first section of wall; 1311. a second wire slot; 132. a second section of wall surface; 1321. a first convex portion; 14. A through hole; 141. a first centerline; 20. a first joint pipe; 21. a second outer wall surface; 22. a second step surface; 30. a second joint pipe; 31. a first step surface; 32. a first inner wall surface; 40. a main body; 41. a third end face; 411. a third wire slot; 42. a fourth end face; 43. a third outer wall surface; 431. a third convex portion; 44. A second centerline.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1, 2, 5 and 6, fig. 1 shows a cross-sectional view through a first center line 141 of a through-hole 14 of a gasket according to an embodiment of the present invention, fig. 2 shows an enlarged structural view at a of fig. 1, fig. 5 shows a cross-sectional view through the first center line 141 of the through-hole 14 of a combined seal structure according to an embodiment of the present invention, and fig. 6 shows an enlarged structural view at B of fig. 5. According to an embodiment of the present invention, a gasket includes a body 10. The body 10 is provided with a first end face 11 and a second end face 12 opposite to each other, and a first outer wall face 13 connecting the first end face 11 and the second end face 12. The body 10 is further provided with a through hole 14 extending from the first end surface 11 to the second end surface 12, and the body 10 is sleeved on the first joint pipe 20 through the through hole 14. Specifically, the first end surface 11 is adapted to be in sealing interference fit with the first step surface 31 of the second joint pipe 30. The first outer wall surface 13 is provided with two or more first protrusions 1321 provided at intervals. The first protrusions 1321 are provided around the circumferential direction of the through hole 14, the first protrusions 1321 are for sealing interference fit with the first inner wall surface 32 of the second joint pipe 30, and the distance from two or more first protrusions 1321 to the first center line 141 of the through hole 14 gradually increases in the direction from the first end surface 11 to the second end surface 12.

Note that the distance from the first protrusion 1321 to the first centerline 141 of the through hole 14 refers to the distance between the position on the surface of the first protrusion 1321 farthest from the first centerline 141 and the first centerline 141, i.e., S as illustrated in fig. 1. When the first protrusion 1321 is in sealing contact with the first inner wall surface 32 of the second joint pipe 30, a portion of the surface of the first protrusion 1321, which is farthest from the first center line 141 of the through hole 14, is in sealing contact with the first inner wall surface 32 of the second joint pipe 30.

When the gasket is assembled with the first joint pipe 20 and the second joint pipe 30 to form a combined sealing structure, the gasket is firstly sleeved on the end part of the first joint pipe 20 through the through hole 14, then the first joint pipe 20 is installed in the second joint pipe 30, so that the first end surface 11 of the gasket is in sealing interference with the first step surface 31 of the second joint pipe 30, and more than two first convex parts 1321 on the first outer wall surface 13 are in sealing interference fit with the first inner wall surface 32 of the second joint pipe 30. Therefore, on one hand, because the distance S from the two or more first protrusions 1321 to the first center line 141 of the through hole 14 gradually increases in the direction from the first end surface 11 to the second end surface 12, that is, the whole first outer wall surface 13 of the body 10 is similar to a cone shape, the cone shape plays a self-positioning role in the butt joint installation process of the sealing gasket and the second joint pipe 30, and the installation deviation between the first joint pipe 20 and the second joint pipe 30 can be compensated in the installation process, so that the assembly operation is convenient; on the other hand, the first end surface 11 is in sealing interference fit with the first step surface 31 of the second joint pipe 30 to form a plane seal as a primary seal section, and meanwhile, the more than two first convex portions 1321 are in sealing interference fit with the first inner wall surface 32 of the second joint pipe 30 to form more than two annular line seals, and the more than two annular line seals form a rear seal section, so that the sealing performance of the structure can be further enhanced, meanwhile, the leakage risk caused by installation deviation can be reduced, and the sealing performance can be ensured.

Referring to fig. 1, fig. 2 and fig. 6, further, the first end surface 11 is a plane. Therefore, when the first end surface 11 is a plane, the first end surface 11 can be ensured to be in surface contact with the first step surface of the second joint pipe 30, and after the first end surface and the second end surface are in sealing and abutting fit, the sealing performance is better.

Referring to fig. 3 and 4, fig. 3 is a view-angle structural view of a gasket according to an embodiment of the utility model, and fig. 4 is a view-angle structural view of a gasket according to another embodiment of the utility model. Further, the first end surface 11 is provided with a first wire groove 111 circumferentially arranged around the through hole 14. In addition, the first line groove 111 serves as a blocking groove, which can block fluid and improve sealing performance. Of course, as an alternative, the first wire casing 111 may not be disposed on the first end surface 11 as shown in fig. 4, which also falls within the protection scope of the present embodiment, and is not limited herein and disposed according to actual requirements.

Referring to fig. 2, 3 and 6, in one embodiment, the first outer wall 13 includes a first section 131 and a second section 132 sequentially arranged along a first center line 141 of the through hole 14. The first segment wall 131 is closer to the first end face 11 than the second segment wall 132. The first-stage wall surface 131 is provided with a second line groove 1311 provided around the circumferential direction of the through hole 14. Two or more first protrusions 1321 are provided on the second-stage wall surface 132. Thus, the second grooves 1311 can block the fluid flowing through the first-stage wall surface 131, thereby improving the sealing performance. The first protrusions 1321 on the second-stage wall surface 132 are spaced apart from each other, and when the first protrusions 1321 are in close contact with the first inner wall surface 32 of the second joint pipe 30, the first protrusions 1321 that are deformed accordingly may be pressed against the space between two adjacent first protrusions 1321.

In the process of manufacturing the gasket, the first protrusion 1321, the first line groove 111, and the second line groove 1311 are integrally formed with the gasket by injection molding, but it is needless to say that a semi-finished product is formed by injection molding, and then the first protrusion 1321, the first line groove 111, the second line groove 1311, and the through hole 14 are formed in the semi-finished product by milling, and the gasket may be obtained by other methods, which is not limited herein.

Referring to fig. 1, 2 and 6, in one embodiment, a cross section of the first protrusion 1321 is taken through the first center line 141 of the through hole 14, and a point farthest from the first center line 141 in the cross section is referred to as a point p; the connecting line of more than two points p on the same cross section is obliquely arranged relative to the first central line 141, and the oblique angle is a; the first inner wall surface 32 has an inclination angle b with respect to the axis of the second joint pipe 30, and a and b are the same. Thus, the first joint pipe 20 is installed in the second joint pipe 30, so that the two or more first protrusions 1321 on the first outer wall surface 13 can be synchronously in sealing interference fit with the first inner wall surface 32 of the second joint pipe 30, and the sealing effect is good. In the present embodiment, a and b are both smaller than 90 °, specifically, for example, 45 ° to 85 °.

As an optional scheme, a and b may also be different, and since the first protrusion 1321 is an elastic protrusion, the first protrusion 1321 deforms when in tight contact with the first inner wall surface 32, and it is also possible to realize that more than two first protrusions 1321 are in synchronous sealing contact with the first inner wall surface 32.

Referring to fig. 1, 2 and 6, in one embodiment, a cross section of the first protrusion 1321 is taken through the first center line 141 of the through hole 14, and the cross section is a semicircular surface, a triangular surface, a semi-elliptical surface, a rectangular surface or a trapezoidal surface. The cross section of the first convex portion 1321 is not limited to a semicircular surface, a triangular surface, a semi-elliptical surface, a rectangular surface, or a trapezoidal surface, and may have other shapes, which is not limited herein.

Referring to fig. 1, 2 and 6, in one embodiment, the body 10 includes an inner portion and an outer portion disposed circumferentially around the inner portion. The inner part is a hard part and the outer part is an elastic part. Note that, the inner portion is, for example, an area indicated by a circle Q in fig. 2, and the outer portion is an area other than the area indicated by the circle Q on the main body 10. Thus, the hardness of the inner portion is greater than that of the outer portion, the inner portion can be easily and stably sleeved on the first joint pipe 20, and the outer portion can be deformed, so that the sealing effect of the first convex portion 1321 and the first inner wall surface 32 can be ensured.

In one embodiment, the inner portion includes a connecting portion connected to the outer portion and a hard member disposed on the connecting portion. Specifically, the material of the connecting portion and the material of the outer portion may be the same or different, and are, for example, elastic soft materials.

In another embodiment, the inner portion is made of hard material, and the outer portion is made of elastic material thermally fused to the periphery of the inner portion. In addition, the hard member is, for example, a metal member, a ceramic member, a hard plastic member, a hard rubber member, or the like, and the hard member may be embedded in the connecting portion, may be completely embedded in the connecting portion, may be attached to the surface of the connecting portion, or the like.

In one embodiment, the wall of the through hole 14 is provided with two or more second protrusions (not shown) spaced apart from each other. A second projection is circumferentially disposed around the bore wall of the through bore 14 for sealing interference fit with the second outer wall surface 21 of the first connector tube 20. Thus, the two or more second protrusions can make two or more line contacts with the second outer wall surface 21 of the first joint pipe 20, and sealing performance between the first joint pipe 20 and the body 10 can be ensured. It should be noted that, the second protrusion is specifically, for example, an elastic protrusion, so that the second protrusion can completely contact the second outer wall surface 21 of the first joint pipe 20 under the external pressure, and the sealing effect between the first joint pipe 20 and the body 10 is good.

Specifically, the second outer wall surface 21 of the first joint pipe 20 is disposed to be inclined with respect to the axis of the first joint pipe 20, and accordingly, the distance from the two or more second protrusions to the first center line 141 of the through hole 14 gradually increases in the direction from the first end surface 11 to the second end surface 12, so that the through hole 14 is shaped like a cone, and the two or more second protrusions can be in sealing interference fit with the second outer wall surface 21 of the first joint pipe 20, thereby ensuring the sealing performance between the first joint pipe 20 and the body 10. In addition, it is possible to compensate for the installation deviation between the first joint pipe 20 and the second joint pipe 30 during the installation process, so that the assembling operation is convenient.

As an alternative embodiment, it is also possible to eliminate the need to provide a second protrusion on the wall of the through hole 14, where the wall of the through hole 14 is perpendicular to the first end surface 11 and is adapted to the second outer wall surface 21 of the first joint pipe 20, and the body 10 is directly fitted onto the first joint pipe 20 through the through hole 14.

As some optional embodiments, after the body 10 is sleeved and mounted on the end of the first joint pipe 20, in order to ensure the sealing performance between the body 10 and the first joint pipe 20, it can be realized by, but not limited to: for example, the bore diameter of the through hole 14 may be made slightly smaller than the outer diameter of the end of the first joint pipe 20, i.e., the end of the first joint pipe 20 is interference-fitted with the through hole 14; for another example, after the body 10 is sleeved and mounted on the end of the first joint pipe 20, the sealing performance between the body 10 and the end of the first joint pipe 20 is ensured by the sealant; for another example, a seal ring is provided between the inner wall of the through hole 14 of the body 10 and the outer wall of the end portion of the first joint pipe 20.

In this embodiment, the first end surface 11 and the second end surface 12 are specifically disposed in parallel, for example, but may have a certain included angle, and is not limited herein.

In this embodiment, the first center line 141 of the through hole 14 is perpendicular to the first end surface 11, but may be in other included angle relationship with the first end surface 11, for example, 85 ° to 95 °, which is not limited herein.

Referring to fig. 1, 2 and 6, in one embodiment, a combined sealing structure includes a sealing gasket according to any one of the above embodiments, and further includes a first joint pipe 20 and a second joint pipe 30. The body 10 is sleeved on the first joint pipe 20 through the through hole 14. The first end surface 11 is in sealing interference fit with the first step surface 31 of the second joint pipe 30. The first projection 1321 is in sealing interference fit with the first inner wall surface 32.

When the gasket, the first joint pipe 20 and the second joint pipe 30 are assembled to form the combined sealing structure, the gasket is firstly sleeved on the end portion of the first joint pipe 20 through the through hole 14, then the first joint pipe 20 is installed in the second joint pipe 30, so that the first end surface 11 of the gasket is in sealing contact with the first step surface 31 of the second joint pipe 30, and more than two first convex portions 1321 on the first outer wall surface 13 are in sealing contact with the first inner wall surface 32 of the second joint pipe 30. Therefore, on one hand, because the distance S from the two or more first protrusions 1321 to the first center line 141 of the through hole 14 gradually increases in the direction from the first end surface 11 to the second end surface 12, that is, the whole first outer wall surface 13 of the body 10 is similar to a cone shape, the cone shape plays a self-positioning role in the butt joint installation process of the sealing gasket and the second joint pipe 30, and the installation deviation between the first joint pipe 20 and the second joint pipe 30 can be compensated in the installation process, so that the assembly operation is convenient; on the other hand, the first end surface 11 is in sealing interference fit with the first step surface 31 of the second joint pipe 30 to form a plane seal as a primary seal section, and meanwhile, the more than two first convex portions 1321 are in sealing interference fit with the first inner wall surface 32 of the second joint pipe 30 to form more than two annular line seals, and the more than two annular line seals form a rear seal section, so that the sealing performance of the structure can be further enhanced, meanwhile, the leakage risk caused by installation deviation can be reduced, and the sealing performance can be ensured.

Referring to fig. 1, 2 and 6, further, the first inner wall surface 32 is disposed obliquely with respect to the axis of the second joint pipe 30; the outer wall of the first joint pipe 20 is provided with a second step surface 22, and the second end surface 12 is in sealing interference fit with the second step surface 22.

Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of a sealing plug according to an embodiment of the present invention, and fig. 8 is an enlarged schematic structural diagram of fig. 7 at C. In one embodiment, the sealing plug comprises a main body 40, the main body 40 is provided with a third end surface 41 and a fourth end surface 42 which are opposite to each other, and a third outer wall surface 43 connecting the third end surface 41 and the fourth end surface 42. The third end surface 41 is adapted to be in sealing interference fit with a third step surface of the third joint pipe. The third outer wall surface 43 is provided with two or more third protrusions 431 provided at intervals. The third protrusions 431 are provided around the circumferential direction of the second center line 44 of the body 40, the third protrusions 431 are for sealing interference fit with the second inner wall surface of the third joint pipe, and the distances from two or more of the third protrusions 431 to the second center line 44 gradually increase in the direction from the third end surface 41 to the fourth end surface 42.

When the sealing plug and the third joint pipe are assembled to form a combined sealing structure, the sealing plug is installed in the third joint pipe, so that the third end face 41 of the sealing plug is in sealing contact with the third step face of the third joint pipe, and the more than two third protrusions 431 on the third outer wall surface 43 are in sealing contact fit with the third inner wall surface of the third joint pipe. Therefore, on one hand, since the distances from the two or more third protrusions 431 to the second center line 44 gradually increase in the direction from the first end surface 11 to the second end surface 12, that is, the whole third outer wall surface 43 of the main body 40 is similar to a cone shape, the cone shape plays a self-positioning role in the butt joint installation process of the sealing plug and the third joint pipe, and the installation deviation between the sealing plug and the third joint pipe can be compensated in the installation process, so that the assembly operation is convenient; on the other hand, the third end face 41 is in sealing interference fit with the third step face to form a plane seal as a primary seal section, meanwhile, the more than two third convex portions 431 are in sealing interference fit with the third inner wall face to form more than two annular line seals, the more than two annular line seals form a rear seal section, the sealing performance of the structure can be further enhanced, meanwhile, the leakage risk caused by installation deviation can be reduced, and the sealing performance can be guaranteed.

Referring to fig. 7 and 8, further, the third end surface 41 is a plane. Therefore, when the third end face 41 is a plane, the third end face 41 can be ensured to be in surface contact with the third step face, and after the third end face 41 and the third step face are in sealing interference fit, the sealing performance is good.

Referring to fig. 7 and 8, a third slot 411 is disposed on the third end surface 41 and circumferentially around the second center line 44. In addition, the third wire groove 411 serves as a blocking groove, which can block fluid and improve sealing performance. Of course, as an optional scheme, the third slot 411 may not be disposed on the third end surface 41, which also falls within the protection scope of the present embodiment, and is not limited herein, and is disposed according to actual requirements.

In infringement comparison, the "first convex portion 1321" may be a "part of the body 10", that is, the "first convex portion 1321" is integrally formed with "other part of the body 10"; the "first protrusion 1321" may be manufactured separately from the "other portion of the body 10" and may be combined with the "other portion of the body 10" to form a single body. As shown in fig. 1 or fig. 2, in one embodiment, the "first protrusion 1321" is a part of the "body 10" that is integrally formed.

It should be noted that, in the infringement comparison, the "third protrusion 431" may be "a part of the main body 40", that is, the "third protrusion 431" is integrally formed with "the other part of the main body 40"; the third protrusion 431 may be manufactured separately from the other portion of the main body 40 and combined with the other portion of the main body 40 to form a single body. As shown in fig. 7 or 8, in one embodiment, the "third protrusion 431" is a part of the "main body 40" that is integrally formed.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, 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 implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A gasket, comprising: the body is provided with a first end face, a second end face and a first outer wall face, wherein the first end face and the second end face are opposite, and the first outer wall face is connected with the first end face and the second end face; the body is also provided with a through hole extending from the first end surface to the second end surface, and the body is sleeved on a first joint pipe through the through hole; be equipped with two above first convex parts that the interval set up on the first outer wall face, first convex part winds the circumference setting of through-hole, first convex part is used for the sealed conflict cooperation with the first internal face of second joint pipe, more than two first convex part arrives the distance of the first central line of through-hole is in first terminal surface extremely increase gradually in the direction of second terminal surface.

2. The gasket of claim 1 wherein said first end surface is planar; and a first wire groove arranged around the circumferential direction of the through hole is formed in the first end surface.

3. The gasket of claim 1 wherein said first outer wall surface comprises a first section of wall surface and a second section of wall surface arranged in series along a first centerline of the through-hole, said first section of wall surface being closer to said first end surface than said second section of wall surface; a second wire groove arranged around the circumferential direction of the through hole is formed in the first section of wall surface; the two or more first protrusions are provided on the second section wall surface.

4. The gasket according to claim 1, wherein a cross section of the first convex portion is taken through a first center line of the through-hole, and a point farthest from the first center line on the cross section is taken as a p-point; the connecting line of more than two p points on the same section is obliquely arranged relative to the first central line, and the inclination angle is a; the inclination angle of the first inner wall surface relative to the axis of the second joint pipe is b, and a is the same as b.

5. The gasket of claim 1, wherein a cross-section of the first convex portion is taken through a first center line of the through-hole, and the cross-section is a semicircular face, a triangular face, a semi-elliptical face, a rectangular face, or a trapezoidal face.

6. The gasket of claim 1 wherein said body includes an inner portion and an outer portion disposed circumferentially about said inner portion; the inner portion is a hard portion and the outer portion is an elastic portion.

7. The gasket of claim 6, wherein the inner portion includes a connecting portion connected to the outer portion and a hard member provided on the connecting portion; or the inner side part is made of hard materials, and the outer side part is made of elastic materials which are arranged on the periphery of the inner side part in a hot melting mode.

8. The gasket of claim 1, wherein the wall of the through-hole is provided with two or more second protrusions disposed at intervals, the second protrusions being disposed circumferentially around the wall of the through-hole, the second protrusions being adapted to sealingly engage against the second outer wall surface of the first joint pipe.

9. A combined sealing structure, characterized in that the combined sealing structure comprises the sealing gasket according to any one of claims 1 to 8, and further comprises a first joint pipe and a second joint pipe, wherein the body is sleeved on the first joint pipe through the through hole; the first convex part is in sealing interference fit with the first inner wall surface.

10. A sealing plug is characterized by comprising a main body, wherein the main body is provided with a third end face, a fourth end face and a third outer wall face, the third end face and the fourth end face are opposite, and the third outer wall face is connected with the third end face and the fourth end face; be equipped with two or more third convex parts that the interval set up on the third outer wall face, the third convex part is around the circumference setting of the second central line of main part, the third convex part is used for conflicting the cooperation with the second internal face of third joint pipe is sealed, and more than two the third convex part reaches the distance of second central line is in the third terminal surface extremely increase gradually in the direction of fourth terminal surface.

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