CN211649396U

CN211649396U - Sealing device

Info

Publication number: CN211649396U
Application number: CN201922072873.4U
Authority: CN
Inventors: 黄锟; 朱昌军
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-10-09
Anticipated expiration: 2029-11-27

Abstract

The utility model provides a sealing device, which is used for sealing two sections of pipelines and comprises two flanges which are oppositely arranged and a sealing element which is arranged between the two flanges; through holes communicated with pipelines are formed in the two flanges, a gap is formed between the two flanges, and the extending direction of the gap is perpendicular to the extending direction of the through holes; one sides of the two flanges, which are close to the gap, are respectively provided with a first groove, and the first grooves are used for accommodating the sealing elements; one side of the sealing element, which is close to the pipeline, is provided with a second groove, and the opening direction of the second groove faces the through hole. The utility model discloses can strengthen the leakproofness between sealing member and the flange, reduce manufacturing cost and improved production efficiency on prior art's basis.

Description

Sealing device

Technical Field

The utility model relates to a flange seal technical field especially relates to a sealing device.

Background

Flanges are parts for interconnecting pipes and are used for connecting pipe ends, and flanges are used for connecting equipment inlets and outlets and are used for connecting two pieces of equipment. For example, in order to realize pipeline connection and control and cut off media in pipelines, control valves, cut-off valves and the like are arranged on different sections of a process pipeline, in order to keep pressure-bearing grades consistent between the pipelines and joints of the pipelines and the valves and avoid leakage, the process is usually completed by connecting flanges and sealing gaskets in the flanges, such as extrusion sealing of steel ring gaskets, the sealing process is realized by symmetrically pressing the sealing gaskets arranged in two flange pieces to generate elastic deformation, and nuts matched with bolts on two sides of the flanges are screwed diagonally during pressing, so that the steel ring gaskets are embedded into sealing grooves of the flanges to form sealing and guarantee the pressure-bearing grade. However, when the process pipeline is normally produced, due to the temperature and pressure fluctuation of the medium in the pipeline, the sealing gasket and the flange sealing groove in the flange sheet are easily affected by the temperature and the pressure to generate the leakage, and even the sealing failure problem occurs.

In the prior art, the flange plate is fastened again after the pipeline is put into operation so as to solve the problem of leakage caused by the influence of temperature and pressure of the flange and the sealing gasket, the normal operation of pipeline sealing is ensured, and the flange plate and the sealing gasket therein are replaced after the sealing is failed due to multiple fastening use so as to ensure the sealing performance of the sealing gasket and the sealing surface of the flange plate.

However, the above-mentioned way of replacing the flange plate or the steel ring cushion needs to release the pressure of the pipeline, even the operation procedures such as industrial firing, etc., which increases the production cost and reduces the production efficiency.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a sealing device can strengthen the leakproofness between sealing member and the flange, has reduced manufacturing cost and has improved production efficiency on prior art's basis.

In order to achieve the above purpose, the sealing device provided by the utility model is used for sealing between two sections of pipelines, and comprises two flanges which are oppositely arranged and a sealing element which is arranged between the two flanges; the two flanges are respectively provided with a through hole communicated with a pipeline, a gap is formed between the two flanges, and the extending direction of the gap is perpendicular to the extending direction of the through hole.

One sides of the two flanges, which are close to the gap, are respectively provided with a first groove, and the first grooves are used for accommodating the sealing elements; one side of the sealing element, which is close to the pipeline, is provided with a second groove, and the opening direction of the second groove faces the through hole.

In the sealing device, optionally, the sealing member includes a sealing inner edge and a sealing outer edge; the sealing inner edge is positioned on one side close to the second groove in the extending direction vertical to the through hole, and the sealing outer edge is positioned on one side far away from the second groove in the extending direction vertical to the through hole.

The first side wall of the first groove is tightly attached to the sealing inner edge of the sealing piece, and the second side wall of the first groove is tightly attached to the sealing outer edge of the sealing piece.

In the above sealing device, a cross section of the sealing member in a direction perpendicular to an extending direction of the through hole may be octagonal.

In the above sealing device, the cross section of the sealing member perpendicular to the extending direction of the through hole may be an ellipse or a circle.

In the above-described sealing device, optionally, a dimension of the second groove in the extending direction of the through hole is kept constant along an opening direction of the second groove.

In the above sealing device, optionally, a dimension of the second groove in the extending direction of the through hole is gradually increased along an opening direction of the second groove.

In the above sealing device, optionally, a distance between the second groove and the first end of the sealing member is equal to a distance between the second groove and the second end of the sealing member.

In the sealing device, optionally, an extending direction of the groove body of the second groove is perpendicular to an extending direction of the through hole.

In the above sealing device, optionally, the ends of the two flanges, which are opposite to each other and are far away from the pipeline, are connected by bolts.

In the above sealing device, optionally, a dimension of the second groove in a direction perpendicular to an extending direction of the through hole is not more than one-half of a dimension of the sealing member in the direction perpendicular to the extending direction of the through hole.

The utility model provides a sealing device, including relative two flanges that set up and the sealing member of setting between two flanges, be equipped with the through-hole that communicates with the pipeline on two flanges, and be formed with the clearance between two flanges, one side that two flanges are close to the clearance is provided with first recess respectively, and first recess is used for holding the sealing member. The second groove is arranged on one side, close to the pipeline, of the sealing element, and the opening direction of the second groove faces the through hole, so that acting force is generated on the second groove by the medium, the first side wall of the first groove is tightly attached to the sealing inner edge of the sealing element, and the second side wall of the first groove is tightly attached to the sealing outer edge of the sealing element. The distance between the first ends of the second groove and the sealing piece is equal to the distance between the second ends of the second groove and the sealing piece, the extending direction of the groove body of the second groove is perpendicular to the extending direction of the through hole, and the second groove is located in the middle of the sealing piece, so that the acting force of the medium on the second groove is uniformly distributed to the two first grooves, and the sealing performance between the sealing piece and the first grooves is further improved. Therefore, the utility model discloses only rely on sealing device's structure itself just can strengthen the sealing performance between sealing member and the flange, need not carry out fastening many times and frequent change flange and sealing member to two flanges, reduced manufacturing cost on prior art's basis to by a wide margin improvement production efficiency.

The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a sealing device according to an embodiment of the present invention;

fig. 2 is a schematic view of an operating state of a sealing device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a sealing member according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first groove of a flange according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a sealing member according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of another sealing member according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of another sealing member according to an embodiment of the present invention;

fig. 8 is a schematic cross-sectional view of another sealing member provided in accordance with an embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of another sealing member according to an embodiment of the present invention;

fig. 10 is a schematic cross-sectional view of a sealing member according to a second embodiment of the present invention;

fig. 11 is a schematic cross-sectional view of another sealing member according to the second embodiment of the present invention;

fig. 12 is a schematic cross-sectional view of another sealing member according to the second embodiment of the present invention;

fig. 13 is a schematic cross-sectional view of another sealing member provided in the second embodiment of the present invention;

fig. 14 is a schematic cross-sectional view of another sealing element provided in the second embodiment of the present invention.

Description of reference numerals:

100-sealing means;

10-a flange;

101-a first flange portion;

102-a second flange portion;

103-a through hole;

104-a gap;

105-a first groove;

1051-a first sidewall;

1052-a second side wall;

20. 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i, 20 j-seals;

201-a second groove;

202-sealing the inner edge;

203-sealing the outer edge;

204-a first end;

205-a second end;

30-bolts;

40-nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the present invention, unless otherwise explicitly specified or limited, terms such as "mounted," "connected," and "fixed" are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; it can be mechanically coupled, directly coupled, indirectly coupled through intervening media, coupled between two elements, or coupled between two elements in a mutual relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example one

Fig. 1 is a schematic structural diagram of a sealing device according to an embodiment of the present invention. Fig. 2 is a schematic view of an operating state of the sealing device according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a sealing member according to an embodiment of the present invention. Fig. 4 is a schematic structural diagram of a first groove of a flange according to an embodiment of the present invention. Fig. 5 is a schematic cross-sectional view of a sealing member according to an embodiment of the present invention. Fig. 6 is a schematic cross-sectional view of another sealing member according to an embodiment of the present invention. Fig. 7 is a schematic cross-sectional view of another sealing member according to an embodiment of the present invention. Fig. 8 is a schematic cross-sectional view of another sealing member according to an embodiment of the present invention. Fig. 9 is a schematic cross-sectional view of another sealing member according to an embodiment of the present invention.

Referring to fig. 1 to 4, a sealing device 100 according to a first embodiment of the present invention is provided for sealing between two sections of pipelines, and includes two flanges 10 disposed opposite to each other and a sealing member 20 disposed between the two flanges 10; both flanges 10 are provided with through holes 103 communicated with pipelines, the flanges 10 are separated into a first flange part 101 and a second flange part 102 by the through holes 103, the pipelines are arranged in the through holes 103 between the first flange part 101 and the second flange part 102, and the extending direction of the pipelines is the extending direction of the through holes 103.

Specifically, the end of the pipeline is connected to the inlet of the flange 10 by welding so that the pipeline communicates with the through hole 103 of the flange 10.

A gap 104 is formed between the two flanges 10, and the extending direction of the gap 104 is perpendicular to the extending direction of the through hole 103.

Wherein, the two flanges 10 are respectively provided with a first groove 105 on one side close to the gap 104, and the first groove 105 is used for accommodating the sealing member 20.

As an alternative embodiment, the opposite ends of the two flanges 10 remote from the pipeline are bolted together. Specifically, as shown in fig. 1, through holes are provided at ends of two flanges 10, which are opposite to each other, away from the pipeline, bolts 30 are inserted through the through holes, nuts 40 are provided at both sides of the bolts 30, the bolts 30 are used in cooperation with the nuts 40, and the two flanges 10 are screwed together in a direction approaching the gap 104, so that the sealing member 20 is inserted into the first groove 105 to form a seal.

It should be noted that the first groove 105 and the flange 10 may be an integral structure or a separate structure. When the first groove 105 and the flange 10 are of an integral structure, the first groove 105 is directly formed on one side wall of the flange 10 close to the gap 104; when the first groove 105 and the flange 10 are of a separate structure, the first groove 105 is of a separate structure, an opening for accommodating the first groove 105 is formed in the side wall of the flange 10 close to the gap 104, and the first groove 105 is detachably embedded in the opening of the side wall of the flange 10 close to the gap 104.

Further, the first groove 105 and the side wall of the flange 10 near the gap 104 may also be connected in a non-detachable manner, for example, the connection position of the first groove 105 and the side wall of the flange 10 near the gap 104 is made of metal, and at this time, the first groove 105 and the side wall of the flange 10 may be connected by welding.

It should be noted that, when the first groove 105 and the flange 10 are of an integral structure, the sealing performance of the sealing device 100 is better.

Furthermore, a second groove 201 is provided on the side of the sealing element 20 close to the pipeline, and the opening direction of the second groove 201 faces the pipeline.

Specifically, the sealing member 20 includes a sealing inner edge 202 and a sealing outer edge 203, the sealing inner edge 202 is located on a side close to the second groove 201 in the extending direction perpendicular to the through hole 103, and the sealing outer edge 203 is located on a side away from the second groove 201 in the extending direction perpendicular to the through hole 103. The first side wall 1051 of the first groove 105 is in close proximity to the inner sealing edge 202 of the sealing member 20 and the second side wall 1052 of the first groove 105 is in close proximity to the outer sealing edge 203 of the sealing member 20.

It should be noted that, in the actual use process, as shown in fig. 2, two sections of pipelines are respectively disposed in the through hole 103 between the two first flange portions 101 and the two second flange portions 102, the medium in the pipeline flows in the left-to-right direction (as shown in fig. 2) or in the right-to-left direction (opposite to the direction shown in fig. 2), when the medium in the pipeline flows through the gap 104 formed by the two flanges 10, a part of the medium continues to flow in the original flow direction, and the rest of the medium flows to the sealing member 20 through the gap 104. When the medium flows to the sealing element 20, because the opening direction of the second groove 201 faces the pipeline, the medium flows into the second groove 201 of the sealing element 20, and generates a force towards three inner walls of the second groove 201, and the sealing element 20 is subjected to expansion deformation towards two sides, so that the sealing performance between the sealing element 20 and the first groove 105 is enhanced, and the sealing inner edge 202 of the sealing element 20 is further tightly attached to the first side wall 1051 of the first groove 105 and the sealing outer edge 203 of the sealing element 20 is further tightly attached to the second side wall 1052 of the first groove 105.

Therefore, the embodiment of the present invention can carry out symmetry, even decomposition with the pressure in the medium at the inside wall of the second groove 201 of the sealing member 20, and then outwards expand the inside wall of the second groove 201 of the sealing member 20, thereby the first groove 105 of the flange 10 supports the sealing member 20 and pushes away, so that the sealing member 20 and the first groove 105 form a sealed whole, the sealing effect of the sealing member 20 and the first groove 105 is guaranteed to be more stable under the condition that the medium pressure is larger, and the problem that the temperature change of the medium and the reuse of the sealing member 20 cause the elasticity of the sealing member 20 to lose efficacy is overcome. That is, the seal member 20 is expanded and deformed, so that the seal inner edge 202 and the seal outer extension 203 are pressed and attached to the two side walls of the first groove 105 more strongly, and the sealing performance is stronger.

Furthermore, in order to make the forces exerted by the first end 204 and the second end 205 of the sealing member 20 on the two oppositely arranged first grooves 105 more uniform, the distance between the second groove 201 and the first end 204 of the sealing member 20 is equal to the distance between the second groove 201 and the second end 205 of the sealing member 20, that is, the second groove 201 is located at an intermediate position of the sealing member 20 in the extending direction of the through hole 103.

Also, in order to make the forces of the first end 204 and the second end 205 of the sealing member 20 on the first groove 105 more uniform, the extension direction of the body of the second groove 201 may be perpendicular to the extension direction of the through hole 103.

That is, when the second groove 201 is divided with the extending direction of the gap 104 as the dividing line, the second groove 201 can be evenly divided into two identical portions, and at the same time, the seal 20 can be divided into two identical portions.

As an alternative embodiment, the dimension of the second groove 201 in the direction perpendicular to the extension direction of the through hole 103 is not greater than half the dimension of the sealing element 20 in the direction perpendicular to the extension direction of the through hole 103, so as to ensure that the bottom wall of the second groove 201 opposite to the opening of the second groove 201 has sufficient bearing capacity, thereby ensuring that the sealing element 20 does not break and has a longer service life.

It should be noted that, in the practical application process, the groove depth of the second groove 201 may be set according to the requirements of the practical scenario. For example, the larger the medium pressure in the pipeline, the greater the pressing pressure of the flanges at two sides to be borne by the sealing element during assembly, so that the depth of the groove is set to be relatively shallower, thereby increasing the bearing strength of the sealing element.

In a preferred embodiment, the shape of the second groove 201 is an arc or a circle, the higher the medium pressure is, the higher the pressure the sealing member 20 is subjected to is, and the better the relative pressure-bearing capacity is when the second groove 201 is an arc or a circle.

It should be noted that, in the sealing device according to the first embodiment of the present invention, the sealing member 20 has an octagonal prism structure, that is, the cross section of the sealing member 20 in the direction perpendicular to the extending direction of the through hole 103 is octagonal.

The structure of the second groove 201 includes, but is not limited to, the following two possible implementation manners:

one possible implementation is: as shown in fig. 5, the dimension of the second groove 201 in the extending direction of the through-hole 103 is kept constant along the opening direction of the second groove 201. For example, the cross section of the second groove 201 may be square, rectangular, etc., and the present invention is not limited thereto, nor to the above examples.

Another possible implementation is: as shown in fig. 6 to 9, the size of the second groove 201 in the extending direction of the through hole 103 gradually increases along the opening direction of the second groove 201. For example, the cross section of the second groove 201 may be a cone, a U, a circle, a triangle, etc., and the present invention is not limited thereto, nor to the above examples.

It should be noted that the present invention introduces the pressure of the medium to decompose the acting force so as to make the elastic shape of the sealing member 20 in the first groove 105 change greatly, thereby realizing the effect of tighter sealing, and especially overcoming the influence of temperature change (such as sealing failure when rising) under the condition that the medium pressure is larger so as to make the sealing effect not fail continuously.

It should be noted that the utility model discloses the setting of second recess 201 sets up under the condition that does not influence the intensity of sealing member 20 itself, and the sealing member among the prior art is inefficacious except that self sealed face appears damaging easily, and the leading cause is exactly that extruded elastic deformation leads to the sealing member to become invalid, consequently the utility model discloses a set up second recess 201 and provide a pressure extrusion and push away, thereby the atress that makes the sealing member 20 need obtain extrusion that second recess 201 still can obtain extrusion of second recess 201 except that the extrusion that relies on first recess 105 produces deformation when used repeatedly offsets, and reuse rate is high.

The embodiment of the utility model provides a sealing device, including relative two flanges that set up and the sealing member of setting between two flanges, be equipped with the through-hole with the pipeline intercommunication on two flanges, and be formed with the clearance between two flanges, one side that two flanges are close to the clearance is provided with first recess respectively, and first recess is used for holding the sealing member. The second groove is arranged on one side, close to the pipeline, of the sealing element, the opening direction of the second groove faces towards the pipeline, so that the medium flows to the second groove and generates lateral abutting force to the side wall of the second groove, the first side wall of the first groove is tightly attached to the sealing inner edge of the sealing element, and the second side wall of the first groove is tightly attached to the sealing outer edge of the sealing element. The distance between the second groove and the first end of the sealing element is equal to the distance between the second groove and the second end of the sealing element, and the extending direction of the groove body of the second groove is perpendicular to the extending direction of the through hole, so that the sealing performance between the sealing element and the first groove is further improved. In addition, the size of the second groove in the extending direction of the through hole is gradually increased along the opening direction of the second groove, the pushing effect of the medium pressure in the flange on the sealing inner edge of the sealing element is further improved, and therefore the sealing effect between the sealing element and the first groove is further increased. Therefore, the utility model discloses only rely on sealing device's structure itself just can strengthen the sealing performance between sealing member and the flange, need not carry out fastening many times and frequent change flange and sealing member to two flanges, reduced manufacturing cost on prior art's basis to by a wide margin improvement production efficiency.

Example two

Fig. 10 is a schematic cross-sectional view of a sealing member according to a second embodiment of the present invention. Fig. 11 is a schematic cross-sectional view of another sealing member according to the second embodiment of the present invention. Fig. 12 is a schematic cross-sectional view of another sealing member according to the second embodiment of the present invention. Fig. 13 is a schematic cross-sectional view of another sealing element according to an embodiment of the present invention. Fig. 14 is a schematic cross-sectional view of another sealing element provided in the second embodiment of the present invention.

On the basis of the first embodiment, the second embodiment of the present invention further provides a sealing device, as shown in fig. 10 to 14, the second embodiment of the present invention provides a sealing device 100 with another structure, and compared with the first embodiment, the second embodiment of the present invention has a difference in that the structures of the sealing members are different.

Specifically, in the sealing device according to the second embodiment of the present invention, the sealing element 20 has a cylindrical structure, that is, the cross-sectional shape of the sealing element in the extending direction perpendicular to the through hole is an ellipse or a circle.

It should be noted that, by providing the size of the second groove 201 in the extending direction of the through hole 103 to gradually increase along the opening direction of the second groove 201, the pushing action of the medium pressure inside the flange 10 on the sealing inner edge 202 of the sealing member 20 can be further improved, so as to increase the sealing action between the sealing inner edge 202 of the sealing member 20 and the first side wall 1051 of the first groove 105, and between the sealing outer edge 203 of the sealing member 20 and the second side wall 1052 of the first groove 105.

Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.

The embodiment of the utility model provides a second flange device that provides, including relative two flanges that set up and the sealing member of setting between two flanges, be equipped with the through-hole that communicates with the pipeline on two flanges, and be formed with the clearance between two flanges, one side that two flanges are close to the clearance is provided with first recess respectively, and first recess is used for holding the sealing member. The second groove is arranged on one side, close to the pipeline, of the sealing element, the opening direction of the second groove faces towards the pipeline, so that the medium flows to the second groove and generates lateral abutting force to the side wall of the second groove, the first side wall of the first groove is tightly attached to the sealing inner edge of the sealing element, and the second side wall of the first groove is tightly attached to the sealing outer edge of the sealing element. The distance between the second groove and the first end of the sealing element is equal to the distance between the second groove and the second end of the sealing element, and the extending direction of the groove body of the second groove is perpendicular to the extending direction of the through hole, so that the sealing performance between the sealing element and the first groove is further improved. In addition, the size of the second groove in the extending direction of the through hole is gradually increased along the opening direction of the second groove, the pushing effect of the medium pressure in the flange on the sealing inner edge of the sealing element is further improved, and therefore the sealing effect between the sealing element and the first groove is further increased. Therefore, the utility model discloses only rely on sealing device's structure itself just can strengthen the sealing performance between sealing member and the flange, need not carry out fastening many times and frequent change flange and sealing member to two flanges, reduced manufacturing cost on prior art's basis to by a wide margin improvement production efficiency.

In the description of the above embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments and simplifying the description, but do not indicate or imply that the referred devices or components must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the scope of the present embodiments.

Furthermore, the terms "first" and "second" 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 of the 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 description of the present invention, it is to be understood that the description of the terms "some embodiments" or the like is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A sealing device is used for realizing sealing between two sections of pipelines and is characterized by comprising two flanges which are oppositely arranged and a sealing element which is arranged between the two flanges; through holes communicated with pipelines are formed in the two flanges, a gap is formed between the two flanges, and the extending direction of the gap is perpendicular to the extending direction of the through holes;

2. The sealing device of claim 1, wherein the seal includes a seal inner rim and a seal outer rim; the sealing inner edge is positioned on one side close to the second groove in the extending direction vertical to the through hole, and the sealing outer edge is positioned on one side far away from the second groove in the extending direction vertical to the through hole;

3. A sealing arrangement according to claim 2, wherein the cross-section of the sealing element perpendicular to the direction of extension of the through-hole is octagonal.

4. A sealing arrangement according to claim 2, wherein the cross-section of the sealing element perpendicular to the extension of the through-hole is oval or circular.

5. The sealing device according to claim 3 or 4, wherein a dimension of the second groove in an extending direction of the through hole is kept constant along an opening direction of the second groove.

6. The sealing device according to claim 3 or 4, wherein a dimension of the second groove in an extending direction of the through hole is gradually increased along an opening direction of the second groove.

7. A sealing arrangement according to claim 1 or 2, wherein the distance between the second groove and the first end of the seal is equal to the distance between the second groove and the second end of the seal.

8. Sealing device according to claim 1 or 2, characterized in that the extension direction of the groove body of the second groove is perpendicular to the extension direction of the through hole.

9. A sealing arrangement according to claim 1 or 2, wherein the opposite ends of the flanges remote from the pipeline are bolted together.

10. A sealing arrangement according to claim 1 or 2, wherein the dimension of the second groove in a direction perpendicular to the extension of the through hole is not more than half the dimension of the sealing element in a direction perpendicular to the extension of the through hole.