Branch pipe joint and sealing element thereof

Abstract

The invention provides a branch pipe joint and a sealing element thereof, the branch pipe joint comprises at least two coupling units, and the coupling units are connected end to end to define an inner cavity; the fastening element is configured to be used for fastening and connecting at least two coupling units; the sealing element is configured in the inner cavity, the sealing element comprises a main body part and an outer edge part, the main body part is formed by surrounding a circle and is provided with an opening formed in the circumferential direction, and the outer edge part is configured to be formed by outwards protruding and obliquely extending along the edge of the opening.

Description

Technical Field

[0001] The present invention relates to the field of pipeline connection, and more particularly to a branch pipe joint and its seal. Background Art

[0002] Traditional branch pipe joints typically include two metal shells, a seal fittingly received in the metal shells, and a plurality of fastening elements such as bolts and nuts for firmly fastening each of the metal shells to each other. The branch pipe joint applied to a tee connects two pipeline elements and has an opening for connection with a third pipeline element. The configured seal needs to seal the connection between the two pipeline elements while communicating with another pipeline element. The seal typically includes a sealing peripheral wall and a connection opening formed in the sealing peripheral wall. The sealing peripheral wall seals the two pipeline elements, the connection opening is connected to the third pipeline element, and a sealing ring is formed along the edge of the connection opening for sealing the third pipeline element. Usually, the connection opening is designed as a circular opening penetrating the sealing peripheral wall, and its size is limited by the width of the seal. In order to ensure that the third pipeline element has a sufficient flow area, it is necessary to increase the width of the seal to increase the size of the opening, and then adapt to a larger pipeline element. However, this will cause an increase in the volume and weight of the seal, and also make the metal shell adapted to the seal need to have a larger width, further increasing the weight of the branch pipe joint, which is not conducive to production and use. Summary of the Invention

[0003] An advantage of the present invention is to provide a branch pipe joint and its seal, wherein the seal of the branch pipe joint has an outwardly extending outer edge portion suitable for sealing the end of a pipeline element.

[0004] Another advantage of the present invention is to provide a branch pipe joint and its seal, wherein the circumferential length of the outer edge portion of the seal is greater than its axial width, avoiding being limited by the width of the seal.

[0005] Another advantage of the present invention is to provide a branch pipe joint and its seal, wherein the outer edge portion can reduce the axial dimension of the seal when adapting to pipeline elements of the same cross-section.

[0006] Another advantage of the present invention is to provide a branch pipe joint and its seal, wherein the axial projection of the outer peripheral edge of the outer edge portion is located outside the axial projection of the main body portion, so that the outer edge portion closely fits the coupling unit of the pipeline element.

[0007] Another advantage of the present invention is to provide a branch pipe joint and its seal, wherein the coupling unit of the pipeline element includes a pipe portion suitable for connecting a third pipeline element, and the inner diameter of the outer interface of the pipe portion is smaller than the inner diameter of the inner interface, so that the inner interface of the pipe portion adapts to the size of the outer edge portion of the seal.

[0008] According to one aspect of the present invention, the present invention provides a seal for a branch joint, the branch joint including at least two coupling units and a fastening element, the coupling units being connected end to end to define an inner cavity, the fastening element being configured to tightly connect at least two of the coupling units, the seal being disposed in the inner cavity, wherein the seal includes:

[0009] A main body portion and an outer edge portion, the main body portion being formed in a circumferential shape and having an opening formed in the circumferential direction, the outer edge portion being configured to extend outwardly and convexly along the edge of the opening.

[0010] According to an example of the present invention, at least a part of the projection of the outer edge portion in the axial direction exceeds the edge of the main body portion.

[0011] According to an example of the present invention, the outer edge portion is configured to extend outwardly and obliquely along the edge of the opening, and at least a part of the projection of the outer peripheral edge of the outer edge portion in the axial direction falls outside the projection of the main body portion in the axial direction.

[0012] According to an example of the present invention, the length of the opening in the circumferential direction is greater than the width of the opening in the axial direction.

[0013] According to an example of the present invention, a plurality of positioning portions are provided on the outer surface of the main body portion, the positioning portions protruding from the outer surface and extending in the axial direction, and being adapted to cooperate with the coupling unit for positioning.

[0014] According to an example of the present invention, the seal has a first mounting opening and a second mounting opening opposite to each other in the axial direction, and also has a third mounting opening, the outer edge portion defining the third mounting opening, and an included angle is formed between the third mounting opening and the first mounting opening and the second mounting opening.

[0015] According to an example of the present invention, the length of the outer edge portion in the circumferential direction is greater than its width in the axial direction, and includes two opposite circumferentially extending portions and two opposite axially extending portions, the circumferentially extending portions extending along the circumferential edge of the opening, and the axially extending portions extending toward the axial edge of the opening, wherein the axially extending portions are arc-shaped.

[0016] According to an example of the present invention, the coupling unit includes a housing, fastening ends located at both ends of the housing, and a pipe portion, the pipe portion integrally extending outward from a middle position of the housing to define a pipe, and the pipe communicating with the inner cavity.

[0017] According to an example of the present invention, the pipeline portion includes an abutting portion, a saddle, and an external connection portion connected in sequence. The outer edge portion of the branch pipe abuts against the abutting portion. The abutting portion defines an inner interface, and the external connection portion defines an outer interface. The inner diameter of the outer interface is smaller than that of the inner interface.

[0018] According to another aspect of the present invention, the present invention provides a pipeline connection device, including:

[0019] A branch pipe joint; and

[0020] A plurality of pipeline elements, including a first pipeline element and a second pipeline element. The first pipeline element and the second pipeline element are coaxially distributed, and an included angle is formed between the outer edge portion and the first pipeline element and the second pipeline element.

[0021] According to an example of the present invention, the coupling unit is adapted to be installed on another pipeline element, and the opening is adapted to communicate with another pipeline element. Description of the Drawings

[0022] Figure 1 is a schematic diagram of a branch pipe joint according to a preferred embodiment of the present invention.

[0023] Figure 2 is a cross-sectional schematic diagram of a branch pipe joint according to a preferred embodiment of the present invention.

[0024] Figure 3 is a schematic diagram of a seal of a branch pipe joint according to a preferred embodiment of the present invention.

[0025] Figure 4 is a schematic diagram of a seal of a branch pipe joint from another perspective according to a preferred embodiment of the present invention.

[0026] Figure 5 is a cross-sectional schematic diagram of a seal of a branch pipe joint according to a preferred embodiment of the present invention.

[0027] Figure 6 is a cross-sectional schematic diagram of a branch pipe joint without an assembled seal according to a preferred embodiment of the present invention.

[0028] Figure 7 is a cross-sectional schematic diagram of a branch pipe joint with an assembled seal according to a preferred embodiment of the present invention.

[0029] Figure 8 is a cross-sectional schematic diagram of a pipeline connection device according to a preferred embodiment of the present invention.

[0030] Figure 9 is a three-dimensional schematic diagram of a pipeline connection device according to a preferred embodiment of the present invention.

[0031] Figure 10 It is a schematic cross-sectional view of another perspective of the pipeline connection device according to a preferred embodiment of the present invention. Detailed implementation manners

[0032] The terms and words used in the following description are not limited to the literal meanings, but are only used by the present inventors to enable a clear and consistent understanding of the present invention. Therefore, it is obvious to those skilled in the art that the following description of various embodiments of the present invention is provided only for the purpose of illustration and not for the purpose of limiting the present invention as defined by the appended claims and their equivalents.

[0033] Although ordinal numbers such as "first", "second", etc. will be used to describe various components, those components are not limited herein. The term is only used to distinguish one component from another. For example, the first component can be referred to as the second component, and similarly, the second component can also be referred to as the first component without departing from the teachings of the inventive concept of the present invention. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0034] The terms used herein are only for the purpose of describing various embodiments and are not intended to be limiting. As used herein, the singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. Additionally, it will be understood that the terms "comprises" and / or "has" when used in this specification specify the presence of the stated features, numbers, steps, operations, components, elements, or combinations thereof, without precluding the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

[0035] Referring to the illustration of the attached Figures 1 to 10 specification, the present invention provides a pipeline connection device, which includes at least one branch joint 100 and at least one pipeline element 200, and the branch joint 100 is installed at the end of the pipeline element 200. The pipeline connection device is used to couple at least two pipeline elements. The at least two pipeline elements can be two pipelines, one pipeline and one pipe fitting, two pipe fittings, one pipeline and one device with a tubular structure, and two devices with a tubular structure.

[0036] Furthermore, the branch joint 100 is adapted to connect two substantially coaxial pipeline elements 200, and is also adapted to couple another pipeline element 200, and the other pipeline element 200 forms a certain angle with the aforementioned two substantially coaxial pipeline elements 200. Furthermore, the branch joint 100 can form a connection device for a tee pipe.

[0037] The branch pipe joint 100 includes a plurality of coupling units 10 and one or more fastening elements 20. The coupling units 10 are fixedly connected to each other. After the branch pipe joint 100 is installed on the pipeline element 200, the fastening element 20 fastens two adjacent coupling units 10 together. The branch pipe joint 100 also includes at least one sealing member 30, which is disposed on the coupling unit 10.

[0038] The pipe element 200 has an axial length, and the branch pipe joints 100 are distributed around the pipe element 200 in a circumferential direction and have a circumferential length and an axial width.

[0039] Each branch pipe joint 100 is composed of a plurality of coupling units 10 connected end to end in sequence to form a circle, and the plurality may be at least two, such as two, three, four or more than four.

[0040] The coupling units 10 can be made of metal or plastic material, can be coupled to each other and form a substantially annular structure, and define an inner cavity 101. In one embodiment, each of the coupling units 10 has two sides of a C-shape. The coupling unit 10 is adapted to move between an open state and a closed state. The fastening element 30 is configured to fasten the coupling unit 10 in the closed state. When the branch pipe joint 100 is installed on the pipeline element 200, the sealing member 30 is disposed in the inner cavity 101 formed by the coupling unit 10 to provide a sealing effect.

[0041] The pipeline element 200 specifically includes a first pipeline element 201 and a second pipeline element 202, and each of the pipeline elements 201 and 202 can be, but not limited to, a pipeline, a pipe fitting such as an elbow, a valve and a tee, or a device having a tubular structure. Therefore, the branch pipe joint 100 can be used to couple two pipelines, a pipeline and a pipe fitting, two pipe fittings, a pipeline and a device having a tubular structure, and two devices having a tubular structure.

[0042] Further, the branch pipe joint 100 is suitable for connecting two substantially coaxial first pipe elements 201 and second pipe elements 202, and is also suitable for coupling another pipe element 200, and another pipe element 200 and the aforementioned two substantially coaxial first pipe elements 201 and second pipe elements 202 form a certain angle, so that the branch pipe joint 100 can form a three-way pipe connection device.

[0043] The sealing member 30 is disposed between the coupling unit 10 and the pipe element 200 to provide sealing.

[0044] The seal 30 has a first mounting port 301, a second mounting port 302, and a third mounting port 303, which are respectively adapted to mount a pipeline element 200. For example, the first mounting port 301 is adapted to mount the first pipeline element 201, the second mounting port 302 is adapted to mount the second pipeline element 202, and the third mounting port 303 is adapted to mount another pipeline element 200. Among them, the first mounting opening 301 and the second mounting opening 302 face each other and are coaxially distributed, and there is an included angle between the third mounting opening 303 and the first mounting opening 301 and the second mounting opening 302.

[0045] The seal 30 includes a main body portion 31. The main body portion 31 is formed by surrounding in a circle and has an outer surface 311 facing the outer peripheral side and an inner surface 321 facing the inner peripheral side. The outer surface 311 is provided with a positioning portion 32, and the positioning portion 32 is formed to protrude from the outer surface 311 and is distributed along the axial direction. The positioning portion 32 is adapted to cooperate with the coupling unit 10 to position the installation position of the seal 30 on the coupling unit 10.

[0046] The seal 30 further includes an outer edge portion 33. The outer edge portion 33 has an opening 330, and the opening 330 is opened on the main body portion 31 and penetrates the main body portion 31. The outer edge portion 33 is formed to protrude and extend obliquely outward along the edge of the opening 330 to form a shape that expands outward. The direction of outward expansion includes expanding outward along the radial direction, expanding outward along the axial direction, and / or expanding outward along the radial direction. Or, at least a part of the projection of the outer peripheral edge of the outer edge portion 33 along the axial direction is located outside the projection of the main body portion 31 along the axial direction.

[0047] The shape of the opening 330 is non-circular. The opening 330 has a circumferential length and an axial width, the length is greater than the width, and the circumferential distribution amplitude of the opening 330 on the main body portion 31 is greater than the axial distribution amplitude. The opening 330 expands its distribution amplitude along the circumferential direction to increase the size of the opening 330.

[0048] The outer edge portion 33 defines the third mounting opening 303. The outer edge portion 33 is distributed along the edge of the opening 330 and has a sufficient circumferential length, which is not limited by the axial width of the seal 30, increases the size of the third mounting opening 303, and effectively increases the flow area of the pipeline element 200 that the seal 30 can adapt to. Designed in this way, the seal 30 does not need to have a large width while ensuring a sufficient flow area, effectively reducing the volume and weight of the seal 30.

[0049] The main body portion 31 further includes a retaining ring 313, which is bent inward from the end of the main body portion 31 to extend at an inclined angle, and is adapted to abut against the groove of the pipeline element 200. The retaining rings 313 are formed at both axial ends of the main body portion 31. One of the retaining rings 313 is adapted to abut against the first groove 2010 of the first pipeline element 201, and the other retaining ring 313 is adapted to abut against the second groove 2020 of the second pipeline element 202.

[0050] The coupling unit 10 includes a housing 11 and two fastening ends 12. The housing 11 is generally C-shaped, having a length extending circumferentially and a width in the axial direction. The two fastening ends 13 are respectively located at opposite ends of the housing 11 and integrally extend outward from the two opposite ends of the housing 11. The fastening ends 12 are provided with fastening holes and are adapted to install the fastening element 20.

[0051] Wherein, the two fastening ends 12 of the two coupling units 10 are aligned so that the fastening holes 120 are aligned for installing the fastening element 20. When adjusting the fastening element 20 so that the two coupling units 10 are tightly connected, the distance between the two ends of the two coupling units 10 becomes smaller and smaller until the fastening element 20 is fastened in place. The shapes of the two ends of the two coupling units 10 cooperate with each other and can be designed as diagonal locking, male-female joints, etc. The positioning portion 32 can cooperate with the mating shape formed between the two ends to position the seal 30 at the installation position of the coupling unit 10.

[0052] The fastening element 20 includes a bolt 21 and a nut 22. The bolt 21 passes through the fastening ends 12 of the two aligned coupling units 10 and is fixed by the nut 22, so that the two coupling units 10 are tightly connected to each other.

[0053] The coupling unit 10 further includes a pipe portion 13, which integrally extends from the middle of the housing 11 to form a tube, defining a pipe 130 inside, and is adapted to accommodate the end of another pipeline element 200. The pipe 130 communicates with the inner cavity 101. The pipe 130 has an outer interface 1301 and an inner interface 1302, and the inner interface 1302 communicates with the inner cavity 101. After the coupling unit 10 is installed outside the seal 30, the inner interface 1302 communicates with the third installation opening 303. The outer interface 1301 is adapted to connect to another pipeline element 200.

[0054] The pipeline part 13 includes a contact part 131, a saddle 132, and an external connection part 133. The contact part 131, the saddle 132, and the external connection part 133 are connected in sequence. The contact part 131 defines the inner interface 1302, and the outer edge part 33 of the seal 30 abuts against the inner surface of the contact part 131. The external connection part 133 defines the outer interface 1301 and is adapted for insertion of another pipeline element 200.

[0055] The inner diameter of the contact part 131 is larger than the inner diameter of the external connection part 133. The pipeline 130 decreases in size from the contact part 131 to the external connection part 133, and the inner diameter of the outer interface 1301 is smaller than the inner diameter of the inner interface 1302. The inner diameter of the inner interface 1302 can be adapted to the third installation opening 303 defined by the outer edge part 33 to ensure sufficient flow area.

[0056] The outer edge part 33 includes two opposite circumferentially extending parts 3301 and two opposite axially extending parts 3302. The circumferentially extending parts 3301 extend along the circumferential edge of the opening 330, and the axially extending parts 3302 extend along the axial edge of the opening 330, wherein the axially extending parts 3302 are arc-shaped. The circumferentially extending parts 3301 are longer than the axially extending parts 3302.

[0057] The outer edge part 33 further includes an outward expansion part 331 and an inward pressing part 332. The outward expansion ring 331 extends obliquely outward along the periphery of the opening 330 to form an outward expansion posture. The inward pressing part 332 extends by bending inward at a certain angle from the end of the outward expansion part 331 and is adapted to abut against the contact part 131 of the pipeline part 13 and engage tightly with the pipeline part 13 to ensure tightness.

[0058] The contact part 131 forms a stepped structure facing the inner cavity 101 side to form a step for the inward pressing part 332 to abut against, playing a limiting role and assisting the tight combination of the outer edge part 33 and the pipeline part 13.

[0059] The housing 11 includes a housing base 111, two shoulders 112 integrally extending outward from both ends of the housing base 111, and two engagement keys 113 integrally extending outward and inward from both ends of the two shoulders 112. From the perspective of the attachment Figure 2 the housing 11 is, from top to bottom, the engagement key 113, the shoulder 112, the housing base 111, the other shoulder 112, and the other engagement key 113 in sequence.

[0060] An opening 102 is defined between the engaging keys 113 of the plurality of coupling units 10. As the fastening adjustment of the fastening element 20 is performed, the opening 102 can be narrowed until the engaging keys 113 are tightly combined with the pipeline element 200, and the coupling unit 10 is firmly fixed to the pipeline element 200. As the reverse adjustment of the fastening element 20 is performed, the opening 102 can be enlarged, the engaging keys 113 are disengaged from the outer surface of the pipeline element 200, and the coupling unit 10 can be disassembled.

[0061] The engaging key 113 is adapted to abut against the groove of the pipeline element 200 with a groove to prevent disengagement. The inner diameter of the engaging key 113 is smaller than the inner diameter of the shoulder 112 to tightly abut against the outer surface of the pipeline element 200, and further, to abut against the groove of the pipeline element 200.

[0062] The seal 30 is axially placed between two engaging keys 113 and is limited by the engaging keys 113 to restrict the axial displacement of the seal 30. The positioning portion 32 and the inner surface of the coupling unit 10 cooperate to further restrict the displacement.

[0063] Next, the installation method of the pipeline connection device is introduced. The end of the first pipeline element 201 and the end of the second pipeline element 202 are respectively inserted into the first installation opening 301 and the second installation opening 302 of the seal 30, and the retaining rings 313 at both ends of the seal 30 respectively abut against the outer surface of the first pipeline element 201 and the outer surface of the second pipeline element 202 to form a sealed connection between the seal 30 and the first pipeline element 201 and the second pipeline element 202.

[0064] The coupling unit 10 is installed outside the seal 30, and the positioning portion 32 on the outer surface of the seal 30 and the inner surface of the coupling unit 30 cooperate to position the installation position of the coupling unit 10 on the seal 30.

[0065] The fastening element 20 is installed on the fastening end 12 of the coupling unit 10, and the fastening element 20 is operated to tightly install the coupling unit 10 outside the seal 30 and the pipeline element 200.

[0066] In one embodiment of the present application, the fastening element 20 is pre-installed at the fastening end 12 of the coupling unit 10. When installing the coupling unit 10, directly install the coupling unit 10 with the fastening element 20 outside the seal 30 and the pipeline element 200, and then only need to adjust the fastening degree of the fastening element 20. In another embodiment of the present application, the fastening element 20 is installed at the fastening end 12 of the coupling unit 10 after the coupling unit 10 is installed outside the seal 30 and the pipeline element 200, and then adjust the fastening degree.

[0067] When the fastening element 20 is operated, the opening 102 of the branch joint 100 decreases, and the distance between the fastening end 12 decreases, so that when the engagement key 113 is moved to the desired position, the engagement key 113 is attached to the outer surface of the pipeline element 200, so that the branch joint 100 is firmly held on the pipeline element 200. Further, the engagement key 113 on one side of the housing 11 abuts against the first groove 2010 of the first pipeline element 201, and the engagement key 113 on the other side abuts against the second groove 2020 of the second pipeline element 202 to prevent disengagement.

[0068] Wherein, another pipeline element 200 can be installed on the pipe portion 13, and the outer edge portion 33 forms a seal for another pipeline element 200.

[0069] The specific embodiments describe the basic principles of the present invention. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present invention. In addition, the above-mentioned disclosed specific details are only for the purposes of illustration and easy understanding, rather than limitations. The above details do not limit the present invention to necessarily adopt the above specific details to implement.

[0070] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0071] It should also be noted that in the devices, equipment and methods of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations shall be regarded as equivalent solutions of the present invention.

[0072] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Thus, the present invention is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0073] The above description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present invention to the form disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

Claims

1. A seal for a branch pipe joint, characterized in that, The branch pipe joint includes at least two coupling units and a fastening element. The coupling units are connected end to end to define an inner cavity. The fastening element is configured to tightly connect at least two of the coupling units. The seal is disposed in the inner cavity, wherein the seal includes: A main body portion and an outer edge portion. The main body portion is formed by surrounding a circle. The seal has an opening formed in the circumferential direction. The outer edge portion is configured to extend outwardly and convexly along the edge of the opening.

2. The seal of the branch pipe joint according to claim 1, characterized in that, At least a part of the projection of the outer edge portion towards the axial direction exceeds the edge of the main body portion.

3. The seal of the branch pipe joint according to claim 1, characterized in that, The outer edge portion is configured to extend outwardly and obliquely along the edge of the opening. At least a part of the projection of the outer peripheral edge of the outer edge portion in the axial direction falls outside the projection of the main body portion in the axial direction.

4. The seal of the branch pipe joint according to claim 1, characterized in that, The length of the opening in the circumferential direction is greater than the width of the opening in the axial direction.

5. The seal of the branch pipe joint according to claim 1, characterized in that, A plurality of positioning portions are provided on the outer surface of the main body portion. The positioning portions protrude from the outer surface and extend axially, and are adapted to cooperate with the coupling unit for positioning.

6. The seal of the branch pipe joint according to claim 1, characterized in that, The seal has a first mounting opening and a second mounting opening opposite to each other in the axial direction, and also has a third mounting opening. The outer edge portion defines the third mounting opening. An included angle is formed between the third mounting opening and the first mounting opening and the second mounting opening.

7. The seal for the branch pipe joint according to claim 1, characterized in that, The outer edge portion has a length in the circumferential direction greater than its width in the axial direction, and includes two opposite circumferentially extending portions and two opposite axially extending portions. The circumferentially extending portions extend along the circumferential edge of the opening, and the axially extending portions extend towards the axial edge of the opening. The axially extending portions are arc-shaped.

8. The seal of the branch pipe joint according to claim 1, characterized in that, The coupling unit includes a housing, fastening ends located at both ends of the housing, and a pipe portion. The pipe portion integrally extends outward from the middle position of the housing to define a pipe, and the pipe communicates with the inner cavity.

9. The seal of the branch pipe joint according to claim 8, characterized in that The pipe portion includes a butt portion, a saddle and an external connection portion connected in sequence. The outer edge portion of the branch pipe abuts against the butt portion. The butt portion defines an inner interface, and the external connection portion defines an outer interface. The inner diameter of the outer interface is smaller than the inner diameter of the inner interface.

10. A branch pipe joint, characterized in that, Including the seal according to any one of claims 1 to 9.

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