CN214947126U - Sealing connection device - Google Patents

Abstract

Embodiments of the present disclosure provide a pressure sealing device, including: the first connector, the second connector, the fastener and the sealing member. In the assembled state, the fastening element is connected to the second connecting element and presses the sealing element and the first connecting element. In the sealing connection device provided by the embodiment of the disclosure, the arrangement position of the sealing element is different from that of the traditional flange sealing element. Through changing the position that sets up of sealing member for when the pipe-line transportation high pressure fluid, the inside pressure of pipeline can play supplementary sealed effect, thereby improves sealing stability, reduces the installation pretightning force, reduces the size of spare parts such as bolt, alleviates operation workman's assembly intensity of labour, practices thrift the human cost.

Description

Sealing connection device

Technical Field

Embodiments of the present disclosure relate to a sealed connection device.

Background

The sealing connection device is widely applied to high-pressure fluid conveying or storage equipment to seal the connection part and prevent leakage. For example, the sealing connection device can be used for offshore and land oil and gas field operation equipment, and ensures safe and efficient connection between the oil and gas field operation equipment, such as equipment for well cementation, fracturing, flowback and the like.

At present, a commonly used flange sealing structure is that a flange is respectively arranged at the connecting end part of two pipelines, a sealing element is arranged between the sealing end surfaces of the two flanges, and a plurality of bolts connect the two flanges and compress the sealing element. However, as the pressure of the fluid being delivered increases, flange seal configurations can face a number of problems. For example, the pressure inside the pipe may act on the sealing end face of the flange in the direction opposite to the bolt pressing direction, so that the pressure of the flange on the sealing member is reduced, and the sealing effect is reduced. Therefore, during installation, a large fastening torque needs to be applied to the bolt, and the fastening torque needs to overcome the pressure of the fluid and generate a certain pre-tightening force to the sealing element. As the pressure increases, the size of the flange, bolts, and other parts needs to be increased to meet the sealing requirement, so the flange sealing structure for conveying high-pressure fluid is generally heavy and difficult to install.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a sealing connection device, which improves the sealing stability, reduces the installation pretightening force, lightens the assembly labor intensity of operators and saves the labor cost by changing the arrangement position of a sealing element. Moreover, the inclined plane contacted with the sealing element is arranged, so that the deformation of the sealing element is more uniform, and the sealing effect is further enhanced.

An embodiment of the present disclosure provides a sealing connection device, including: the first connector, the second connector, the fastener and the sealing member. The first connecting piece comprises a first main body part and a flange which are overlapped with each other in a first direction, the flange protrudes out of the outer wall surface of the first main body part in a second direction which is perpendicular to the first direction, the flange comprises a first surface which is far away from the first main body part in the first direction and a second surface and a third surface which are close to the first main body part in the first direction, the third surface is positioned between the second surface of the flange and the outer wall surface of the first main body part in the second direction, at least one part of the third surface and the second surface form a first obtuse included angle in a section in the first direction, and a second obtuse included angle is formed between at least one part of the third surface and the outer wall surface of the first main body part; the second connecting piece comprises a second main body part and a connecting end part, the connecting end part comprises a fourth surface and a fifth surface, and the fourth surface and the fifth surface intersect with each other to form a recess; in an assembled state in which the fastener is connected with the second connector and the seal and the flange of the first connector are restrained within the recess, the first surface of the flange abuts the fourth surface of the connection end, and at least a portion of the seal in the first direction is located between the second surface of the flange and the fastener.

In some examples, in the assembled state, the fifth surface of the second connector and the outer wall surface of the first connector are opposed to and spaced apart from each other, and the seal member abuts on at least one of the second surface and the third surface of the flange, the fifth surface of the connection end portion, and the outer wall surface of the first body portion.

In some examples, in the cross-section, the third surface is a straight line, a curved line, or a bend line connecting a plurality of straight lines.

In some examples, in the assembled state, a minimum value of a distance between the second surface of the flange and the fastener in the first direction is greater than zero.

In some examples, in the assembled state, the seal is in an elastically deformed state.

In some examples, at least one of the first connector and the second connector is a tubular member, and the first direction is an axial direction of the at least one of the first connector and the second connector.

In some examples, the first connector and the second connector are both tubular members, and in the assembled state, the internal passage of the first connector is in communication with the internal passage of the second connector.

In some examples, the material of the seal comprises a soft metal, graphite, or a composite material.

In some examples, the seal comprises an O-ring or C-ring seal.

In some examples, the fastener includes an extension extending in the first direction, the extension being inserted into the recess and abutting the seal to press the seal against the flange of the first connector in the assembled state.

In some examples, the fastener and the second connector are each provided with cooperating threads by which the fastener and the second connector are connected.

In some examples, the sealing connection further comprises a detachable connection that connects the fastener with the second connector in the assembled state.

In some examples, the detachable connection means comprises a bolt.

In some examples, the releasable connection apparatus includes a clip provided with an annular groove, at least a portion of the fastener and at least a portion of the second connector being located within the annular groove, thereby connecting the fastener and the second connector in the first direction.

In some examples, the detachable connection device comprises a threaded connection provided with an internal thread and a crimping portion, the second connection is provided with an external thread, in the assembled state the internal thread of the second connection is connected with the external thread of the threaded connection, and the crimping portion of the threaded connection is crimped with the fastener.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

FIG. 1 is a schematic three-dimensional view of a sealed connection device according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of a sealed connection device according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional structural view of a first connector according to an embodiment of the present disclosure;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 3;

FIG. 5 is a cross-sectional structural view of a second connector according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural view of a seal according to an embodiment of the present disclosure;

FIG. 7 is a schematic three-dimensional view of yet another sealed connection device according to an embodiment of the present disclosure;

FIG. 8 is a cross-sectional structural view of yet another sealed connection in accordance with an embodiment of the present disclosure;

FIG. 9 is a schematic structural view of a detachable connection device according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural view of yet another releasable connecting apparatus according to an embodiment of the present disclosure; and

fig. 11 is a schematic view illustrating a connection structure of a fastener and a second connector according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

In traditional flange terminal surface seal structure, the sealing member sets up between the sealed terminal surface of two flanges, through the bolt with two flange joint and compress tightly the sealing member in order to reach sealed effect. When the pipeline conveys high-pressure fluid, the pressure in the pipeline can act on the sealing end face of the flange along the direction opposite to the bolt pressing direction, so that the pressure of the flange on the sealing element is reduced, the sealing element is loosened, and the sealing effect is reduced.

An embodiment of the present disclosure provides a sealing connection device, including: the first connector, the second connector, the fastener and the sealing member. In the assembled state, the fastening element is connected to the second connecting element and presses the sealing element and the first connecting element. In the sealing connection device provided by the embodiment of the disclosure, the arrangement position of the sealing element is different from that of the traditional flange sealing element. Through changing the position that sets up of sealing member for when the pipe-line transportation high pressure fluid, the inside pressure of pipeline can play supplementary sealed effect, thereby improves sealing stability, reduces the installation pretightning force, reduces the size of spare parts such as bolt, alleviates operation workman's assembly intensity of labour, practices thrift the human cost.

Further, in the sealing coupling device provided in the embodiment of the present disclosure, the first coupling member includes a first body portion and a flange overlapping each other in a first direction, and the flange is provided with a slope surface contacting the sealing member, the slope surface being angled with respect to both the first direction and a second direction perpendicular to the first direction. So, when pipeline internal pressure passes through the inclined plane and acts on the sealing member, can produce the pressure along first direction and second direction to the sealing member, make the deformation of sealing member more even, the sealing member warp along radial direction easier moreover, is favorable to further strengthening the sealed effect to the gap between first connecting piece and the second connecting piece.

The sealing connection device provided by the embodiment of the present disclosure is described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic three-dimensional structure diagram of a sealing connection device according to an embodiment of the present disclosure, and fig. 2 is a schematic cross-sectional structure diagram of the sealing connection device, where the cross-section is a plane where a central axis is located. As shown in fig. 1 and 2, the sealing coupling device 10 includes a first coupling member 11, a second coupling member 12, a fastening member 13, and a sealing member 14. In an assembled state, as shown in fig. 2, one end of the first connecting member 11 and one end of the second connecting member 12 are butted, a communicating channel is formed inside the two, and the sealing member 14 is located at a side connecting gap of the first connecting member 11 and the second connecting member 12 for sealing the connecting gap. The fastener 13 connects the first connector 11, the second connector 12 and the sealing member 14.

Fig. 3 is a schematic cross-sectional structure of the first connecting member 11. As shown in fig. 3, the first connector 11 includes a first body portion 111 and a flange 112 overlapping each other in the first direction. For example, the first connecting member 11 may be a rotating member around the axis X1, and the first main body portion 111 and the flange 112 are distributed along the extending direction of the axis X1, i.e. the axial direction of the first connecting member. The flange 112 protrudes from the outer wall surface 1111 of the first body portion 111 in a second direction (an extending direction perpendicular to the axis X1) perpendicular to the first direction, that is, the outer diameter Φ 1 of the flange 112 is larger than the outer diameter Φ 2 of the first body portion 111. The second direction is a radial direction of the first body portion 111.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3. As shown in fig. 4, the flange 112 includes a first surface 1121 and a second surface 1122 that are spaced apart in the first direction, and the first surface 1121 is located on a side of the second surface 1122 away from the first body portion 111. For example, the first surface 1121 and the second surface 1122 are annular planar surfaces.

As shown in fig. 4, the flange 112 further includes a third surface 1123 at the junction of the second surface 1122 of the flange 112 and the outer wall surface 1111 of the first body portion 111, and the third surface 1123 is located between the second surface 1122 of the flange 112 and the outer wall surface 1111 of the first body portion 111 in the second direction (radial direction). For example, the third surface 1123 may be a sloped surface that is angled with respect to both the axial and radial directions. In a cross section taken along the axis X1 of the first body portion 111, at least a portion of the third surface 1123 forms a first obtuse included angle α with the second surface 1122, and at least a portion of the third surface 1123 forms a second obtuse included angle β with the outer wall surface 1111 of the first body portion 111. For example, the first obtuse included angle α and the second obtuse included angle β may be equal, e.g., 135 degrees each. For another example, the first obtuse included angle α may be greater than or less than the second obtuse included angle β.

For example, in the cross section where the axis X1 of the first body portion 111 is located, the third surface 1123 may be a straight line as shown in fig. 4, may be a curved line, or may be a multi-segment line formed by connecting two or more straight lines. For example, when the cross section of the third surface 1123 is a circular arc, and the first obtuse included angle α and the second obtuse included angle β are measured, a line connecting an intersection a of the circular arc with the second surface 1122 and an intersection B with the outer wall surface 1111 may be taken as a cross section line of the third surface, the cross section line may be taken as a first obtuse included angle α with the second surface 1122, and the cross section line may be taken as a second obtuse included angle β with the outer wall surface 1111. A first obtuse included angle α is formed between at least a portion of the third surface 1123 and the second surface 1122, which means that a first obtuse included angle α is formed between at least a portion of the third surface 1123 and the second surface 1122. For example, when the cross section of the third surface 1123 is a circular arc, a first obtuse included angle α is formed between at least a portion of the third surface 1123 and the second surface 1122, which means that a tangent line of at least a point of the third surface 1123 and the second surface 1122 have the first obtuse included angle α. When the cross section of the third surface 1123 is a multi-segment line, the method for measuring the first obtuse included angle α and the second obtuse included angle β is the same as above, and will not be described herein again. In addition, the cross section of the third surface 1123 may also have other shapes, which is not limited in the embodiment of the disclosure.

Fig. 5 is a schematic cross-sectional view of the second connector 12. As shown in fig. 5, the second connector 12 includes a second body portion 121 and a connection end portion 122. For example, the second connector 12 may be a rotary member around the axis X2, and the second body portion 121 and the connecting end portion 122 are distributed along the extending direction of the axis X2.

As shown in fig. 5, the connection end portion 122 includes a fourth surface 1221 and a fifth surface 1222, and the fourth surface 1221 and the fifth surface 1222 intersect each other to form the recess 123. For example, the fourth surface 1221 and the fifth surface 1222 are perpendicular to each other, and constitute the annular recess 123. For example, the fourth surface 1221 can be a circular flat surface, the fifth surface 1222 can be a cylindrical surface, the fifth surface 1222 can mate with the outer diameter of the flange 112, and the diameter of the fifth surface 1222 is greater than or equal to the outer diameter Φ 1 of the flange 112.

Fig. 2 shows the structure of the sealing joint 10 in an assembled state. It should be noted that, in order to avoid that the reference numbers are too dense to affect the clarity of the drawing, some of the reference numbers are not shown in fig. 2, and the reference numbers that are not shown may refer to fig. 3, fig. 4, and fig. 5.

As shown in fig. 2, the fastening member 13 includes an extension 131 extending in the axial direction, and in the assembled state of the seal connecting device 10, the extension 131 is inserted into the recess 123 and abuts on the sealing member 14 to press the sealing member 14 against the flange 112 of the first connecting member 11.

As shown in fig. 2, in conjunction with fig. 3, 4 and 5, in the assembled state of the sealing coupling device 10, the fastener 13 is coupled to the second coupling member 12 and constrains the sealing member 14 and the flange 112 of the first coupling member 11 within the recess 123, and the fifth surface 1222 of the second coupling member 12 and the outer wall surface 1111 of the first coupling member 11 are opposed to and spaced apart from each other. The first surface 1121 of the flange 112 abuts against the fourth surface 1221 of the connecting end portion 122, the axial direction of the second main body portion 12 and the axial direction of the first main body portion 11 may be substantially parallel, for example, the axis X2 of the second main body portion 12 and the axis X1 of the first main body portion 11 may coincide, and the embodiment of the disclosure does not limit the axis X2 and the axis X1 to strictly coincide, and may allow a certain angle or misalignment therebetween. At least a portion of the seal 14 is located between the second surface 1122 of the flange 112 and the extension 131 of the fastener 13 in the first direction. The sealing member 14 abuts on at least one of the second surface 1122 of the flange 112, the fifth surface 1222 of the connection end portion 122, the outer wall surface 1111 of the first body portion 111, the third surface 1123 of the first connection member 11, and the extension 131 of the fastener 13.

In traditional flange terminal surface seal structure, the sealing member sets up between the sealed terminal surface of two flanges, through the bolt with two flange joint and compress tightly the sealing member in order to reach sealed effect. When the pipeline conveys high-pressure fluid, the pressure in the pipeline can act on the sealing end face of the flange along the direction opposite to the bolt pressing direction, so that the pressure of the flange on the sealing element is reduced, the sealing element is loosened, and the sealing effect is reduced.

In the seal connecting device provided by the embodiment of the disclosure, compared with the end face seal structure of the conventional flange, the seal is transferred from a position clamped between two seal end faces to a position where the flange is far away from the second connecting piece. So, when the pipeline carried high-pressure fluid, under the pressure effect, the fluid of pipeline inside can flow in the gap between first surface 1121 and fourth surface 1221, thereby produce the opposite pressure in the axial on first surface 1121 and fourth surface 1221, promote first connecting piece and remove to the direction of keeping away from the second connecting piece, thereby increase the pressure that acts on the sealing member, make the sealing member produce bigger deformation in order to strengthen sealed effect, improve sealed stability, promote the security of equipment under long-time operation operating mode, the maintenance cycle of extension equipment. That is, in the conventional flange end face sealing structure, the pressure inside the pipe plays a role of reducing the sealing, whereas in the sealing connection device provided in the embodiment of the present disclosure, the pressure inside the pipe may play a role of assisting the sealing. The sealing connection device provided by the embodiment of the disclosure can greatly reduce the bolt connection pretightening force, reduce the weight of equipment, remarkably reduce the assembly labor intensity of operators and save the labor cost.

Furthermore, by providing the third surface 1123 at an angle to both the axial and radial directions, when the pressure inside the pipeline acts on the sealing element through the third surface, the sealing element is pressed in the radial and axial directions, so that the deformation of the sealing element is more uniform, and the sealing element can be more tightly attached to the fifth surface 1222 in the radial direction, thereby enhancing the sealing effect of the gap at this position. And because the contact force between the sealing element and the first connecting piece is distributed to two directions, the local stress of the sealing element and the first connecting piece in a single direction is reduced, the stress concentration is reduced, and the integral pressure-bearing capacity of the sealing connecting device is enhanced.

For example, the sealed connection device provided by the embodiment of the disclosure can bear the fluid pressure of not less than 70 MPa.

For example, the seal 14 is configured to deform under pressure. In the assembled state of the sealing connection, the sealing element 14 is in an elastically or plastically deformed state. For example, the material of the seal 14 includes a soft metal, graphite, or a composite material. The soft metal refers to a metal material having high toughness and plasticity, and may be, for example, austenitic stainless steel or Cr alloy structural steel, etc. The material of the sealing member can be selected according to actual needs.

Fig. 6 is a schematic view of a structure of the sealing member 14. For example, as shown in FIG. 6, the seal may be an O-ring or C-ring seal. The seal may be a continuous member or may be a separable or variable diameter member.

When high pressure fluid is delivered, second surface 1122 of flange 112 is axially displaced by the pressure inside the pipe, thereby compressing seal 14.

For example, in the assembled state, the minimum value of the distance between the second surface 1122 of the flange 112 and the fastener 13 in the axial direction of the first body portion 111 is greater than zero. That is, the seal may be selected to have a suitable ductility and strength based on the fluid pressure so that the seal may allow for greater deformation in the axial direction and may also carry greater pressure.

For example, the minimum value of the distance between the second surface of the flange 112 and the fastener is no less than 50% of the thickness of the seal in the uncompressed state in the axial direction of the first body portion.

For example, the first connecting member 11 and the second connecting member 12 may each be a tubular member, and in the assembled state, the first connecting member 11 communicates with the inside of the second connecting member 12. In this case, the sealing connection device may be applied to a connection of high-pressure fluid delivery pipelines, such as a fracturing manifold, a flowback manifold, a cementing manifold, and the like.

Figures 7 and 8 show an alternative construction of the sealing connection. Fig. 7 is a three-dimensional structure diagram of the sealing connection device, and fig. 8 is a cross-sectional structure diagram of the sealing connection device. For example, as shown in fig. 7 and 8, the first coupling member 11, the second coupling member 12, the fastening member 13, and the sealing member 14 are sealingly coupled in the same manner as the sealing members shown in fig. 1 to 5, and will not be described herein. The difference is that the first connecting member 11 may be a blind plate for blocking one end of the second connecting member 12. At this moment, the sealing connection device can be applied to the end connection of fluid conveying channels such as valves, well heads, pipelines and the like, and can be used as channels for temperature measurement, pressure measurement, fluid medium detection and the like.

As shown in fig. 1-2 and 7-8, the sealed coupling device further includes a detachable coupling device 15. In the assembled state, the detachable connection means 15 connect the fastening element 13 with the second connecting element 12. The detachable connection means 15 may be a stud + nut connection as shown in fig. 1-2 and 7-8, or may be a bolt connection. The sealing connection device can reduce the strength and specification of the bolt through a pressure auxiliary sealing mode, further reduce the overall dimension of the flange and realize the design of the lightweight flange.

Fig. 9 shows a structure of yet another detachable connecting device. As shown in fig. 9, the detachable connecting device 15 may be a clip, and the clip 15 is provided with an annular groove, and at least a portion of the fastening member 13 and at least a portion of the second connecting member 12 are respectively located in the annular groove, so that the fastening member 13 and the second connecting member 12 are connected in the axial direction of the first body portion 111.

For example, the clamp may be a complete circular ring formed by two semicircular fixing rings abutting each other, the inner side of the circular ring being provided with the above-mentioned annular groove. For example, in the assembled state of the clip, two semicircular retaining rings are detachably connected at the butt joint. Of course, the clip may be formed by detachably connecting more fixing rings, and the embodiment of the disclosure is not limited thereto.

Fig. 10 shows a structure of yet another detachable connecting device. As shown in fig. 10, the detachable connection means 15 is in the union connection manner. The detachable connection device 15 may be a threaded connection provided with an internal thread 151 and a crimping portion 152, the second connection member 12 is provided with an external thread 124, in an assembled state, the external thread 124 of the second connection member 12 is connected with the internal thread 151 of the threaded connection member, and the crimping portion 152 of the threaded connection member presses the fastening member 13 in an axial direction of the first body portion 111.

The sealing connection device can also be connected with the second connecting piece directly through a fastener without a detachable connection device. Fig. 11 shows still another connecting structure of the fastener and the second connecting member. As shown in fig. 11, the fastening member 13 and the second connecting member 12 are respectively provided with mutually cooperating threads, and the fastening member 13 and the second connecting member 12 are connected by the threads. For example, the fastener 13 is provided with external threads 132 and the second coupling member 12 is provided with internal threads 125, the fastener being rotatably connected to the second coupling member and compressing the first coupling member and the seal within the recess. The reverse rotation may facilitate decoupling the fastener from the second connector.

In some examples, the sealing connection device provided by the embodiments of the present disclosure may be applied in oil and gas field operation environments, such as for transporting oil, gas, drilling fluid, sulfur-containing water vapor and other media, in which hydrogen sulfide, CH, and the like are often present₄、CO₂And the like, and therefore, the parts of the sealing connection device are required to have enough corrosion resistance to meet the conveying requirement of the fluid medium. For the requirement of corrosion resistance, a material with stronger corrosion resistance can be selected, and sufficient strength is ensured, for example, the materials of the first connecting piece, the second connecting piece, the pressing piece and the sealing piece can be Cr-Mo alloy, martensitic stainless steel, precipitation hardening stainless steel or other alloy materialsAnd (3) materials and the like.

The sealing connection device provided by the embodiment of the disclosure also has better temperature adaptability, for example, the sealing connection device can normally work at an ambient temperature of-60 ℃, and the temperature of the endurable fluid can reach 345 ℃.

The following points need to be explained:

(1) in the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.

(2) Features of the disclosure in the same embodiment and in different embodiments may be combined with each other without conflict.

The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and shall be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (15)

1. A sealing connection, comprising: a first connecting piece, a second connecting piece, a fastener and a sealing piece,

the first connecting piece comprises a first main body part and a flange which are overlapped with each other in a first direction, the flange protrudes out of the outer wall surface of the first main body part in a second direction which is perpendicular to the first direction, the flange comprises a first surface which is far away from the first main body part in the first direction, and a second surface and a third surface which are close to the first main body part in the first direction, in the second direction, the third surface is positioned between the second surface of the flange and the outer wall surface of the first main body part, in the section of the first direction, a first obtuse included angle is formed between at least one part of the third surface and the second surface, and a second obtuse included angle is formed between at least one part of the third surface and the outer wall surface of the first main body part;

the second connecting piece comprises a second main body part and a connecting end part, the connecting end part comprises a fourth surface and a fifth surface, and the fourth surface and the fifth surface intersect with each other to form a recess;

in an assembled state in which the fastener is connected to the second connector and the seal and the flange of the first connector are restrained within the recess, the first surface of the flange abuts the fourth surface of the connection end, and at least a portion of the seal is located between the second surface of the flange and the fastener in the first direction.

2. The sealed connection of claim 1, wherein in the assembled state, the fifth surface of the second connector and the outer wall surface of the first connector are opposed to and spaced apart from each other, and the sealing member abuts on at least one of the second surface and the third surface of the flange, the fifth surface of the connection end portion, and the outer wall surface of the first body portion.

3. The sealing interface as claimed in claim 1 wherein, in said cross-section, said third surface is a straight line, a curved line or a plurality of straight lines connected in a plurality of segments.

4. The sealed connection of claim 1, wherein in the assembled state, a minimum value of a distance between the second surface of the flange and the fastener in the first direction is greater than zero.

5. The sealed connection of claim 4, wherein in the assembled state, the seal is in an elastically deformed state.

6. The sealed coupling device of claim 1, wherein at least one of the first coupling member and the second coupling member is a tubular member, and the first direction is an axial direction of the at least one of the first coupling member and the second coupling member.

7. The sealed connection of claim 6, wherein each of the first and second connectors is a tubular member,

in the assembled state, the internal passage of the first connector communicates with the internal passage of the second connector.

8. The sealed connection of claim 1, wherein the material of the seal comprises a soft metal, graphite, or a composite material.

9. The sealed connection of claim 7, wherein the seal comprises an O-ring or C-ring seal.

10. The sealed connection of claim 1, wherein the fastener includes an extension extending in the first direction, the extension being inserted into the recess and abutting the seal in the assembled state to press the seal against the flange of the first connector.

11. The sealed connection of claim 1, wherein the fastener and the second connector are each provided with cooperating threads by which the fastener and the second connector are connected.

12. The sealed connection of any one of claims 1-10, further comprising a detachable connection that connects the fastener with the second connector in the assembled state.

13. The sealed connection of claim 12, wherein the detachable connection comprises a bolt.

14. The sealed connection of claim 12, wherein the releasable connection includes a clip having an annular groove, at least a portion of the fastener and at least a portion of the second connector being positioned in the annular groove to connect the fastener and the second connector in the first direction.

15. The sealed connection of claim 12, wherein the detachable connection comprises a threaded connection provided with an internal thread and a crimp, the second connection is provided with an external thread, in the assembled state the internal thread of the second connection is connected with the external thread of the threaded connection, and the crimp of the threaded connection is crimped against the fastener.

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