CN112128489B

CN112128489B - Detachable insulation joint

Info

Publication number: CN112128489B
Application number: CN202010948187.3A
Authority: CN
Inventors: 陈清华; 刘勇; 陈嘉紫; 彭远雄; 马伟新; 黄淑芬; 何维; 黄威; 刘文秀
Original assignee: Meizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Meizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2022-06-14
Anticipated expiration: 2040-09-10
Also published as: CN112128489A

Abstract

The invention relates to the field of pipeline connecting pieces, in particular to a detachable insulating joint which comprises a first connecting mechanism and a second connecting mechanism which are matched with two connecting pipelines, wherein the first connecting mechanism comprises an end joint pipe, a first connecting part and a second connecting part, the end joint pipe is connected to the end head of the connecting pipeline, the second connecting mechanism comprises a middle connecting pipe and a third connecting part, the two first connecting parts are fastened and connected to enable the insulating joint to be locked along the axial direction of the end joint pipe, and the second connecting part and the third connecting part are fastened and connected to enable the insulating joint to be locked along the direction which is perpendicular to the axial direction of the end joint pipe. The fastener is screwed up to enable the second connecting mechanism to press the first connecting mechanism during installation, so that the first connecting mechanism presses the connecting pipelines at the two ends to realize tight fit, the first connecting mechanism and the second connecting mechanism can be taken down and replaced by new components after the fastener is disassembled, the connecting and disassembling operation is simple and time-saving, and the insulating joint is convenient to replace at regular time.

Description

Detachable insulation joint

Technical Field

The invention relates to the field of pipeline connecting pieces, in particular to a detachable insulating joint.

Background

The insulated joint is a general name for a pipe joint having both sealing performance and strength performance required for a buried steel pipe and insulating performance required for electric corrosion prevention. Insulated joints are a common device in pipes, made of a negative sacrificial material for preventing galvanic corrosion of the pipe, and are typically placed in the pipe in the form of a weld. As an additional use component of the pipeline, the insulating joint is widely used for pipeline connection for conveying oil, gas and granular and powdery media, so that the installation and the use of pipeline engineering are convenient, but the insulating joint needs to be replaced after being used for a long time.

The insulating joint generally adopts the welding form to install and take one's place, has caused the problem of inconvenient change, and for strengthening the fastness and the leakproofness of connector among the current pipe joint, can improve through various structures such as sub-assembly, insulation board, sealing ring, nozzle stub, the design is complicated and with high costs, and the insulating head of being not convenient for simultaneously is changed, can influence the normal operating of equipment because of the change time is long even.

Disclosure of Invention

The invention aims to provide a detachable insulating joint which is firm in connection, simple in mounting and dismounting operation, convenient to carry integrally and convenient to replace quickly.

In order to realize the purpose, the following technical scheme is provided:

a demountable insulating joint comprising:

the first connecting mechanisms comprise end connecting pipes, first connecting parts and second connecting parts, and the first connecting parts and the second connecting parts are respectively connected to the outer walls of the end connecting pipes;

two connecting pipes, one connecting pipe being connected to one first connecting mechanism;

the second connecting mechanism comprises a middle connecting pipe and a third connecting part arranged on the outer wall of the middle connecting pipe, when each end connecting pipe is connected with the connecting pipeline in an end mode, the middle connecting pipe can be inserted into the middle of the two end connecting pipes, the two first connecting parts can be tightly connected, the middle connecting pipe and the two end connecting pipes are locked along the axial direction of the end connecting pipes, and the second connecting part and the third connecting part can be tightly connected, so that the middle connecting pipe and the end connecting pipes are locked along the direction perpendicular to the axial direction of the end connecting pipes.

Furthermore, a plurality of first connecting holes are formed in the first connecting portion, the first connecting holes are arranged along the circumferential interval of the first connecting portion, and the fastening piece is connected with the first connecting holes in the first connecting portion, so that the middle connecting pipe and the two end connecting pipes are locked along the axial direction of the end connecting pipes.

Furthermore, second connecting holes are formed in two ends of the second connecting portion respectively, third connecting holes are formed in two ends of the third connecting portion respectively, and fasteners are connected with the second connecting holes and the third connecting holes, so that the middle connecting pipe and the end connecting pipe are locked in the direction perpendicular to the axial direction of the end connecting pipe.

Further, be provided with a plurality of first archs, it is a plurality of on the medial surface of butt joint pipe first protruding edge the circumference interval of butt joint pipe sets up, the one end of connecting tube lateral surface is provided with a plurality of first recesses, and is a plurality of first recess is followed the circumference interval of connecting tube sets up, and is a plurality of first arch can joint in a plurality of in the first recess one-to-one.

Furthermore, on the end surface that the end joint pipe and the middle connecting pipe both supported, one was provided with the second arch, and another is provided with the second recess, the protruding joint of second the second recess.

Furthermore, the end surfaces of the end connecting pipes and the middle connecting pipe, which are abutted against each other, form an included angle with the axial direction of the end connecting pipes.

Furthermore, two third connecting portions are arranged on one side of the middle connecting pipe, and two end faces of the middle connecting pipe are gradually close to each other along the direction deviating from the third connecting portions.

Furthermore, the second protrusion is provided with a plurality of on the terminal surface of end joint pipe, and is a plurality of mutual parallel arrangement between the second protrusion, and follows the terminal surface incline direction of end joint pipe extends.

Furthermore, the second grooves are arranged on the end face of the middle connecting pipe in a plurality, are arranged in parallel and extend along the inclined direction of the end face of the middle connecting pipe.

Furthermore, the number of the third connecting parts is two, the two third connecting parts correspond to the two second connecting parts one by one, and when the middle connecting pipe is inserted between the two end connecting pipes, the corresponding one of the third connecting parts and the corresponding one of the second connecting parts are respectively positioned at two sides of the end connecting pipe.

The invention has the beneficial effects that:

the detachable insulating joint is provided with the first connecting mechanism and the second connecting mechanism which are matched with the connecting pipelines, and the detachable insulating joint forms a detachable structure, wherein end connecting pipes of the two first connecting mechanisms are respectively connected with the two connecting pipelines in an end way, when the second connecting mechanism is inserted between the two first connecting mechanisms, the two first connecting mechanisms are connected through the fastening piece, so that the first connecting mechanism and the second connecting mechanism can be axially locked, meanwhile, the fastening piece is connected with the second connecting portion and the third connecting portion, so that the first connecting mechanism and the second connecting mechanism can be locked along the direction vertical to the axial direction, and the detachable insulating joint can also enhance the firmness of the device. When the device is installed, the first connecting mechanisms are installed on the two connecting pipelines respectively, then the second connecting mechanism is inserted between the two first connecting mechanisms, the fastener is screwed down to enable the middle connecting pipe to press the end connecting pipe to move towards the connecting pipelines, the device is fastened, the second connecting mechanism is taken out firstly after the fastener is taken down during disassembly, then the first connecting mechanism is taken down from the connecting pipelines, the detachable connection of the insulating joint is realized, the operation of connection and disassembly is simple, the time is saved, the insulating joint is convenient to replace at regular time, and the normal operation of the device is not influenced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic connection diagram of a first connection mechanism, a connection pipe and a second connection mechanism of a detachable insulation joint provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first connection mechanism and a second connection mechanism of a detachable insulation joint according to an embodiment of the present invention;

FIG. 3 is a schematic view of a first connecting mechanism of a detachable insulation joint according to an embodiment of the present invention;

FIG. 4 is a schematic view of a second coupling mechanism of the demountable insulation joint according to an embodiment of the present invention;

fig. 5 is a schematic view of a connecting pipe structure of a detachable insulating joint according to an embodiment of the present invention.

In the figure:

1-a first connection mechanism; 11-end pipe connection; 111-a first bump; 112-a second protrusion; 12-a first connection; 121-a first connection hole; 13-a second connection; 131-a second connection hole;

2-connecting a pipeline; 21-a first groove;

3-a second connection mechanism; 31-intermediate connecting pipe; 311-a second groove; 32-a third connection; 321-third connecting hole.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when the product is used, and are only for convenience of description of the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only or to distinguish between different structures or components and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The first embodiment is as follows:

referring to fig. 1 to 5, the present embodiment provides a detachable insulating joint, including two first connecting mechanisms 1 and one second connecting mechanism 3 that are matched with two connecting pipes 2, where the first connecting mechanism 1 includes a terminal pipe 11, a first connecting portion 12, and a second connecting portion 13, the first connecting portion 12 and the second connecting portion 13 are respectively connected to an outer wall of the terminal pipe 11, and one connecting pipe 2 is connected to one first connecting mechanism 1; the second connecting mechanism 3 comprises a middle connecting pipe 31 and a third connecting part 32 arranged on the outer wall of the middle connecting pipe 31, when each end connecting pipe 11 is connected with the connecting pipeline 2, the middle connecting pipe 31 can be inserted in the middle of the two end connecting pipes 11, the fastener can be connected with the two first connecting parts 12, so that the middle connecting pipe 31 and the two end connecting pipes 11 are axially locked, and the fastener can be connected with the second connecting part 13 and the third connecting part 32, so that the middle connecting pipe 31 and the end connecting pipes 11 are locked along the direction perpendicular to the axial direction.

The two first connecting mechanisms 1 and the second connecting mechanism 3 which are matched with the connecting pipeline 2 are arranged, the detachable structure is formed, the end connecting pipes 11 of the two first connecting mechanisms 1 are respectively connected with the two connecting pipelines 2 in an end mode, when the second connecting mechanism is inserted between the two first connecting mechanisms, the two first connecting portions 12 are connected through the fastening piece, the first connecting mechanisms 1 and the second connecting mechanisms 3 can be locked in the axial direction, meanwhile, the second connecting portions 13 and the third connecting portions 32 are connected through the fastening piece, the first connecting mechanisms 1 and the second connecting mechanisms 3 can be locked in the direction perpendicular to the axial direction, and all the insulating joint components can be connected firmly and can be detached at the same time. When the connecting device is installed, the first connecting mechanisms 1 are installed on the two connecting pipelines 2 respectively, then the second connecting mechanisms 3 are inserted into the middle of the two first connecting mechanisms 1, the fasteners are screwed down to enable the middle connecting pipes 31 to press the end connecting pipes 11 to move towards the connecting pipelines 2, tight fit is achieved, the second connecting mechanisms 3 are taken out firstly after the fasteners are taken down during disassembly, then the first connecting mechanisms 1 are taken down from the connecting pipelines 2, new components can be replaced, detachable connection of insulating joints is achieved, and the connecting and disassembling operations are simple.

In this embodiment, referring to fig. 2 to 4, a plurality of first connection holes 121 are opened on the first connection portion 12, the plurality of first connection holes 121 are arranged at intervals along the circumferential direction of the first connection portion 12, and the fastener connects the first connection holes 121 on the two first connection portions 12, so that the intermediate connection pipe 31 and the two end connection pipes 11 are axially locked. Above-mentioned setting makes the axial fixity locking of insulating joint through the first connecting hole 121 structure on fastener connection two first connecting portion 12, and then middle connecting pipe 31 oppresses end pipe 11, make end pipe 11 oppress to both ends connecting tube 2, a plurality of first connecting holes 121 set up along the axial interval of first connecting portion 12, axial locking power between first coupling mechanism 1 and the second coupling mechanism 3 has not only been strengthened, also make end pipe 11 and middle connecting pipe 31 circumference atress even, the long-time safe and stable use of insulating joint in pipe-line system has been guaranteed.

Specifically, each first connection portion 12 has twelve first connection holes 121, and the twelve first connection holes 121 are spaced apart from each other along the circumferential direction of the first connection portion 12.

In the present embodiment, referring to fig. 2 to 4, the second connecting portion 13 is provided at both ends thereof with second connecting holes 131, the third connecting portion 32 is provided at both ends thereof with third connecting holes 321, and a fastener connects the second connecting holes 131 and the third connecting holes 321, so that the intermediate connecting pipe 31 and the end connecting pipe 11 are locked in a direction perpendicular to the axial direction. The above arrangement enables the insulated joint to be fixedly locked in a direction perpendicular to the axial direction, and the second coupling hole 131 and the third coupling hole 321 are respectively provided at both ends of the second coupling portion 13 and the third coupling portion 32, so that both sides of the end connection pipe 11 and the intermediate connection pipe 31 are fastened and balanced, and the insulated joint is fastened and stabilized in the radial direction.

In this embodiment, referring to fig. 1, 3 and 5, a plurality of first protrusions 111 are provided on an inner side surface of the end connection pipe 11, the plurality of first protrusions 111 are arranged at intervals along a circumferential direction of the end connection pipe 11, a plurality of first grooves 21 are provided at one end of an outer side surface of the connection pipe 2, the plurality of first grooves 21 are arranged at intervals along a circumferential direction of the connection pipe 2, and the plurality of first protrusions 111 can be clamped in the plurality of first grooves 21 in a one-to-one correspondence manner. First protruding 111 makes first coupling mechanism 1 and connecting tube 2 detachable connection fixed with first recess 21 one-to-one joint among the above-mentioned setting, and has strengthened the leakproofness between connecting tube 2 and end joint pipe 11, and a plurality of first protruding 111 and a plurality of first recess 21 set up along end joint pipe 11 and connecting tube 2's circumference interval respectively for it is more firm when being connected of first coupling mechanism 1 and connecting tube 2, is favorable to insulating joint safety to be used.

Specifically, each end connecting pipe 11 is provided with twelve first protrusions 111, each connecting pipe 2 is provided with twelve corresponding first grooves 21, and the first protrusions 111 are clamped in the first grooves 21 in a one-to-one correspondence manner.

In this embodiment, referring to fig. 3 and 4, on the end surface where the end connecting pipe 11 and the middle connecting pipe 31 abut against each other, one is provided with a second protrusion 112, and the other is provided with a second groove 311, and the second protrusion 112 is clamped in the second groove 311. The cooperation setting of second arch 112 and second recess 311 on the terminal surface makes middle connecting pipe 31 more firm with being connected of two end connection pipes 11, and when the fastener is connected first connecting hole 121 and is carried out the axial fastening and when the fastener is connected second connecting hole 131 and third connecting hole 321 and is carried out radial fastening, guaranteed end connection pipe 11 and middle connecting pipe 31 can not be because of the effect radial dislocation of fastening power, screw up the stability that the fastener in-process insulation connects, strengthen detachable insulation connects's leakproofness and the sound construction degree simultaneously.

In the present embodiment, referring to fig. 2 to 4, the end surfaces of the end pipes 11 and the intermediate connecting pipe 31, which abut against each other, are disposed at an angle to the axial direction of the end pipes 11. End pipe 11 and middle connecting pipe 31 are through being the terminal surface looks adaptation behind the contained angle setting, make simultaneously in the installation, middle connecting pipe 31 cartridge reduces in the resistance of end pipe 11, and middle connecting pipe 31 takes out easy installation and dismantlement from end pipe 11 when dismantling.

Further, referring to fig. 2 and 4, two third connection portions 32 are disposed at one side of the intermediate connection pipe 31, and two end surfaces of the intermediate connection pipe 31 gradually approach in a direction away from the third connection portions 32. Specifically, the end surface of the end connection pipe 11 is higher on the side closer to the second connection portion 13 than on the side away from the second connection portion 13, and the end surface of the intermediate connection pipe 31 is higher on the side closer to the third connection portion 32 than on the side away from the third connection portion 32. During the installation, one side that middle connecting pipe 31 deviates from third connecting portion 32 gets into the centre of two end connection pipes 11 from one side that end connection pipe 11 deviates from second connecting portion 13 earlier, and the terminal surface that middle connecting pipe 31 deviates from third connecting portion 32 at last and end connection pipe 11 are close to the mutual butt of terminal surface of second connecting portion 13, and the terminal surface that middle connecting pipe 31 is close to third connecting portion 32 and the mutual butt of terminal surface that end connection pipe 11 deviates from second connecting portion 13. By means of the end surface height design of the middle connecting pipe 31 and the end connecting pipe 11, on one hand, the side with larger pipe body length provides larger connecting contact area of the connecting part, the fastening strength of the end connecting pipe 11 and the middle connecting pipe 31 when the fastener is connected with the second connecting hole 131 and the third connecting hole 321 is enhanced, and on the other hand, the manual installation and disassembly operation is easy.

In this embodiment, referring to fig. 2 and 4, two third connecting portions 32 are provided, two third connecting portions 32 correspond to two second connecting portions 13 one by one, and when the middle connecting pipe 31 is inserted between two end connecting pipes 11, the corresponding one of the third connecting portions 32 and one of the second connecting portions 13 are located on two sides of the end connecting pipe 11 respectively. Above-mentioned setting, two upper and lower end joint pipes 11 correspond through second connecting portion 13 and two third connecting portions 32 respectively and are connected, and two second connecting portions 13 and two third connecting portions 32 align from top to bottom separately, and a corresponding second connecting portion 13 and a third connecting portion 32 are located the body both sides, and the plane at the two place is mutually perpendicular with the axial of end joint pipe 11, has guaranteed that end joint pipe 11 and middle connecting pipe 31 are along the direction stable fastening mutually perpendicularly with the axial.

Example two:

the second embodiment discloses a detachable insulation joint, which has a structure substantially the same as that of the first embodiment. The detachable insulating joint comprises two first connecting mechanisms 1 and a second connecting mechanism 3 which are matched with the two connecting pipelines 2, and the specific structure and the connecting mode of the structure are the same as those in the first embodiment.

Referring to fig. 3 and 4, the present embodiment is different from the first embodiment in that: the second protrusions 112 are provided in plurality on the end surface of the end joint pipe 11, and the plurality of second protrusions 112 are arranged in parallel to each other and extend in the direction in which the end surface of the end joint pipe 11 is inclined. The setting of a plurality of second arch 112 has strengthened the joint strength of end joint pipe 11 and intermediate junction pipe 31, is of value to the safe handling that insulated joint, and mutual parallel arrangement makes between a plurality of second arch 112 when guaranteeing joint strength, and the operation process of intermediate junction pipe 31 cartridge between two end joint pipes 11 is comparatively laborsaving, and it is also easier to take out the process when dismantling equally.

The second grooves 311 are provided in plurality on the end surface of the intermediate connection pipe 31, and the plurality of second grooves 311 are provided in parallel with each other and extend in an oblique direction along the end surface of the intermediate connection pipe 31. The second groove 311 is matched with the second protrusion 112 for arrangement, so that the sealing property and the connection stability of the insulation joint structure are guaranteed.

Specifically, the second grooves 311 are disposed on both the upper and lower end faces of the middle connection pipe 31, the number of the second protrusions 112 and the number of the second grooves 311 disposed on the end faces of the middle connection pipe 31 are the same, and the second protrusions 112 on the end faces of the end connection pipes 11 are correspondingly clamped with the second grooves 311 on the end faces of the middle connection pipe 31. For example, 5 second protrusions 112 and 5 second grooves 311 are respectively arranged on the end surfaces where the second protrusions 112 and the second grooves 311 are respectively arranged, and each second protrusion 112 is clamped by the corresponding second groove 311 in the axial direction.

The quantity that second arch 112 and second recess 311 set up on the terminal surface at respective place is guaranteeing under the same prerequisite, and the specific number that sets up can be decided according to actual demand, guarantees that the end connection pipe 11 of insulating joint is stable with intermediate junction 31's being connected, can not take place radial dislocation because of external force, and the terminal surface seamless connection of end connection pipe 11 and intermediate junction 31 looks butt, can select different quantity of setting to optimize not unidimensional insulating joint.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A demountable insulating joint, comprising:

the connecting device comprises two first connecting mechanisms (1), wherein each first connecting mechanism (1) comprises an end connecting pipe (11), a first connecting part (12) and a second connecting part (13), the first connecting part (12) is connected to the end surface of the end connecting pipe (11), and the second connecting part (13) is connected to the outer wall of the end connecting pipe (11);

two connecting pipelines (2), wherein one end of each connecting pipeline (2) is correspondingly connected with one end connecting pipe (11);

the second connecting mechanism (3) comprises a middle connecting pipe (31) and a third connecting part (32) arranged on the outer wall of the middle connecting pipe (31), when each end connecting pipe (11) is connected with the connecting pipeline (2), the middle connecting pipe (31) can be inserted between the two end connecting pipes (11), the two first connecting parts (12) can be tightly connected, so that the middle connecting pipe (31) and the two end connecting pipes (11) are locked along the axial direction of the end connecting pipes (11), and the second connecting part (13) and the third connecting part (32) can be tightly connected, so that the middle connecting pipe (31) and the end connecting pipes (11) are locked along the direction perpendicular to the axial direction of the end connecting pipes (11);

one end surface of the end joint pipe (11) and the end surface of the middle connecting pipe (31) are abutted against each other and provided with a second protrusion (112), the other end surface of the end joint pipe is provided with a second groove (311), and the second protrusion (112) is clamped with the second groove (311);

the end surface of the butt joint pipe (11) and the end surface of the middle connecting pipe (31) which are abutted against each other form an included angle with the axial direction of the butt joint pipe (11).

2. The detachable insulation joint according to claim 1, wherein a plurality of first connection holes (121) are formed in the first connection portion (12), the plurality of first connection holes (121) are spaced apart along a circumferential direction of the first connection portion (12), and a fastener is connected to the first connection holes (121) of the two first connection portions (12), so that the intermediate connection pipe (31) and the two end connection pipes (11) are locked along an axial direction of the end connection pipe (11).

3. The detachable insulation joint according to claim 1, wherein the second connection portion (13) is provided at both ends thereof with second connection holes (131), the third connection portion (32) is provided at both ends thereof with third connection holes (321), and a fastening member connects the second connection holes (131) and the third connection holes (321) so that the intermediate connection pipe (31) and the end connection pipe (11) are locked in a direction perpendicular to an axial direction along the end connection pipe (11).

4. The detachable insulation joint according to claim 1, wherein a plurality of first protrusions (111) are disposed on an inner side surface of the terminal pipe (11), the plurality of first protrusions (111) are disposed along a circumferential direction of the terminal pipe (11) at intervals, one end of an outer side surface of the connection pipe (2) is provided with a plurality of first grooves (21), the plurality of first grooves (21) are disposed along the circumferential direction of the connection pipe (2) at intervals, and the plurality of first protrusions (111) can be engaged in the plurality of first grooves (21) in a one-to-one correspondence manner.

5. The insulated joint of the detachable type according to claim 1, characterized in that two of said third connecting portions (32) are provided on one side of said intermediate connecting tube (31), and in that two end faces of said intermediate connecting tube (31) are gradually closer in a direction away from said third connecting portions (32).

6. The insulated joint of the detachable type according to claim 5, characterized in that said second protrusion (112) is provided in plurality on the end surface of said terminal pipe (11), and a plurality of said second protrusions (112) are provided in parallel with each other and extend along the end surface of said terminal pipe (11) in an oblique direction.

7. The detachable insulation joint according to claim 5, wherein the second grooves (311) are provided in plural on the end surface of the intermediate connection pipe (31), and the plural second grooves (311) are provided in parallel with each other and extend in an oblique direction along the end surface of the intermediate connection pipe (31).

8. The detachable insulating joint according to claim 1, wherein there are two third connecting portions (32), two third connecting portions (32) are corresponding to two second connecting portions (13), and when the intermediate connecting pipe (31) is inserted between two end connecting pipes (11), one third connecting portion (32) and one second connecting portion (13) are located at two sides of the end connecting pipe (11).