Metal corrugated pipe connecting joint

Abstract

The utility model relates to the technical field of corrugated pipes, and discloses a metal corrugated pipe connector which is mainly composed of a connector body and a supporting assembly, a front cavity is formed in the front end of the connector body, a rear cavity is formed in the rear end of the connector body, and the supporting assembly is arranged in the rear end of the connector body. According to the corrugated pipe, the sealing piece is arranged between the connector body and the corrugated pipe body, traditional rigid contact between the connector body and the supporting assembly is effectively changed, flexible contact between the connector body and the supporting assembly is effectively increased, and a gap between the connector body and the supporting assembly is reduced; and the limiting pieces are connected with the outer surface of the corrugated pipe body in a sleeving mode, further sealing protection can be provided for the connector body and the corrugated pipe body through the three layers of limiting pieces, and in addition, the sealing performance between the connector body and the supporting assembly is further improved by connecting the outer connecting position of the connector body and the corrugated pipe mechanism in a sleeving mode through a locking ring.

Description

Technical Field

[0001] The present application relates to the technical field of bellows, and in particular to a metal bellows connecting joint. Background Art

[0002] Metal bellows is a kind of wavy-shaped pipe formed by plastic deformation of metal. It is mainly used for non-concentric axial transmission with a very small bending radius, or irregular turning, expansion and contraction, or absorbing thermal deformation of pipes, etc., or for connecting pipes to pipes or connecting pipes to equipment in occasions where it is not convenient to install with fixed elbows. When connecting metal bellows with other components, connecting joints are required, but there are still some defects in the use of connecting joints: First, the existing metal bellows and connecting joints are generally rigidly connected, and gaps are likely to appear between the two after installation, resulting in the inability to ensure the sealing effect of the fixed installation of the metal bellows; secondly, during installation and disassembly, the staff often use a lot of force to perform the rotating operation to ensure that the end of the metal bellows and the connecting joint are tightly connected, which makes the installation and disassembly process troublesome, time-consuming and labor-intensive. Utility Model Content

[0003] The present application proposes a metal bellows connecting joint, which has the advantages of effectively changing the connection method between the joint mechanism and the bellows mechanism, improving the sealing between the joint mechanism and the bellows mechanism, and saving time and effort. It is used to solve the problem that the joint mechanism and the bellows mechanism have poor sealing when in use, and are time-consuming and labor-intensive to install and disassemble.

[0004] To achieve the above objectives, the present application adopts the following technical solution: a metal bellows connecting joint, comprising:

[0005] The joint mechanism is composed of a joint body and a support assembly. The front end of the joint body is provided with a front cavity, and the rear end of the joint body is provided with a rear cavity. The diameter of the front cavity of the joint body is smaller than that of the rear cavity. The outer wall of the rear end port of the joint body is arranged obliquely. The rear end of the joint body is provided with a support assembly, and the interior of the support assembly is filled with gas to improve the sealing performance of the joint mechanism.

[0006] A bellows mechanism, comprising a bellows body and a wire mesh sleeve, wherein the outer wall of the bellows body is provided with a plurality of annular corrugations, and the outer portion of the bellows body is movably connected to the wire mesh sleeve, the end of the bellows body is movably connected to the rear cavity of the connector body, and the end of the wire mesh sleeve is in contact with the wall surface of the rear cavity of the connector body, and the end of the bellows body extends out of the end of the wire mesh sleeve;

[0007] A locking ring is movably sleeved on the outer walls of the joint mechanism and the bellows mechanism. The locking ring is made of flexible rubber and has a shrinkage property and is used to seal the connection point of the joint mechanism and the bellows mechanism.

[0008] Furthermore, the support assembly includes:

[0009] A movable part, wherein a movable groove is formed on the rear end outer wall of the joint body, and the joint body is connected to the movable part through the movable groove. The number of the movable parts is four, and the movable parts are evenly arranged around the joint body, and are used to provide power for a stable connection between the joint mechanism and the bellows mechanism;

[0010] a first air pipe, one end of which is fixedly connected to the movable member, providing a communication path between the movable member and the sealing member;

[0011] A sealing member, wherein a wall surface of the joint body located at the junction of the front cavity and the rear cavity is fixedly connected to one side of the sealing member, and the other side of the sealing member is in contact with the main body of the bellows to reduce the gap between the joint body and the main body of the bellows, and the other end of the first air pipe is fixedly connected to the sealing member;

[0012] a second air pipe, one end of which is fixedly connected to the movable member, providing a communication path between the movable member and the limiting member;

[0013] A limit piece, the rear end inner wall of the joint body is fixedly sleeved with the outer surface of the limit piece, and the inner surface of the limit piece is fitted with the outer wall of the bellows body. The number of the limit pieces is three, and they are linearly arranged inside the joint body to further reduce the gap between the joint body and the bellows body. The other end of the second air pipe is fixedly connected to the limit piece.

[0014] Furthermore, the movable part includes:

[0015] A movable membrane, the bottom end of which is fixedly connected to the inner wall of the movable groove of the joint body, the movable membrane is made of rubber, and has the function of vertical deformation;

[0016] The movable plate, the top of the movable membrane is fixedly connected to the movable plate, and the movable membrane and the movable plate are connected by a movable spring. The movable plate is made of hard material, and the shape of the movable plate is adapted to the curvature of the outer wall of the joint body.

[0017] Furthermore, the sealing element includes:

[0018] A sealing membrane, one side of which is fixedly connected to the joint body, and the other side of which is in contact with the bellows body. The sealing membrane is annular in shape, and the inner diameter of the sealing membrane is equal to the diameter of the front cavity of the joint body. The sealing membrane is made of rubber and has the function of lateral deformation.

[0019] A sealing ring, one side of the sealing ring is fitted with an inner wall of one side of the sealing membrane, and the side wall surface of the sealing membrane is fixedly connected to the joint body, the other side of the sealing ring is fixedly connected to the inner wall of the other side of the sealing membrane, and the side wall surface of the sealing membrane is fitted with the bellows body, a sealing groove is provided on one side of the sealing ring, the sealing ring is fixedly connected to one end of the sealing spring through the sealing groove, and the other end of the sealing spring is fixedly connected to the inner wall of the sealing membrane.

[0020] Furthermore, the limiting member includes:

[0021] A limiting membrane, wherein the outer ring of the limiting membrane is fixedly connected to the inner wall of the joint body, the limiting membrane is made of rubber, and has the function of radial deformation. The outer wall and the inner wall of the limiting membrane are connected by a limiting spring, and the elastic coefficient of the limiting spring is larger than that of the movable spring. The shape of the limiting membrane is annular, and in the original state, the limiting membrane and the limiting block are not in contact with the bellows body. In the expanded state, the limiting block is clamped with the bellows body;

[0022] A limit block, one end of which is fixedly connected to the inner ring of the limit membrane, and the other end of which is movably engaged with the trough position of the bellows body. Four limit blocks are correspondingly provided for one limit membrane, and the shape of the limit block is adapted to the shape of the bellows body.

[0023] This application has the following beneficial effects:

[0024] The present application provides a metal bellows connection joint, which effectively changes the traditional hard contact between the joint body and the support assembly by arranging a sealing member between the joint body and the bellows body, effectively increases the flexible contact between the joint body and the support assembly, and reduces the gap between the joint body and the support assembly. At the same time, by arranging a limiter inside the joint body, and the limiter is sleeved on the outer surface of the bellows body, the setting of the three-layer limiter can provide further sealing protection for the joint body and the bellows body. In addition, by sleeved on the locking ring at the external connection between the joint body and the bellows mechanism, the sealing between the joint body and the support assembly is further improved. In summary, the triple setting of the present application is used to effectively reduce the gap between the joint mechanism and the bellows mechanism, and ensure the sealing effect between the two.

[0025] By setting a support assembly and a locking ring, when installation is required, first the locking ring is movably sleeved on the outside of the bellows mechanism, and then the end of the bellows body is inserted into the inside of the joint body, so that the seal is compressed, and the joint body, the seal and the bellows body are tightly fitted. Then the locking ring is sleeved on the connection between the joint mechanism and the bellows mechanism, and the locking ring pushes the movable part to be compressed, expands from the limit part and engages with the outer wall of the bellows body. In summary, a stable connection between the joint mechanism and the bellows mechanism is achieved. When disassembly is required, the joint mechanism and the bellows mechanism can be separated by only removing or cutting the locking ring, without wasting the staff's effort, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments disclosed herein and, together with the description, serve to explain the principles disclosed herein.

[0027] The present application can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0028] Figure 1 This is the overall three-dimensional structure diagram of this application;

[0029] Figure 2 A cross-sectional perspective structural diagram of the present application;

[0030] Figure 3 For this application Figure 2 A magnified structural diagram;

[0031] Figure 4 A three-dimensional structural diagram of the bellows mechanism in this application;

[0032] Figure 5 This is a three-dimensional structural diagram of the bellows mechanism, seal, and limiter in this application;

[0033] Figure 6 This is a three-dimensional structural diagram of the locking ring in this application;

[0034] Figure 7 A three-dimensional structural diagram of the joint mechanism in this application;

[0035] Figure 8 This is a cross-sectional three-dimensional structural diagram of the joint mechanism in this application;

[0036] Figure 9 A three-dimensional structural diagram of the support assembly in this application;

[0037] Figure 10 This is a cross-sectional three-dimensional structural diagram of the support component in this application.

[0038] In the figure: 1. Joint mechanism; 11. Joint body; 12. Support assembly; 2. Bellows mechanism; 21. Bellows body; 22. Wire mesh sleeve; 3. Locking ring; 4. Movable part; 41. Movable membrane; 42. Movable plate; 5. First air pipe; 6. Sealing part; 61. Sealing membrane; 62. Sealing ring; 7. Second air pipe; 8. Limiting part; 81. Limiting membrane; 82. Limiting block. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] A metal bellows connecting joint, comprising:

[0041] See also Figure 1-Figure 3 、 Figure 7-10 , the joint mechanism 1 is used to connect the bellows mechanism 2 and other components. The joint mechanism 1 consists of a joint body 11 and a support assembly 12. The front end of the joint body 11 is provided with a front cavity, and the rear end of the joint body 11 is provided with a rear cavity. The diameter of the front cavity of the joint body 11 is smaller than that of the rear cavity, which can make the inner wall diameter of the bellows body 21 adapt to the front cavity of the joint body 11 and prepare for the close fit between the bellows body 21 and the joint body 11. The outer wall of the rear end port of the joint body 11 is obliquely set to improve the convenience of moving the locking ring 3 from the bellows mechanism 2 to the joint mechanism 1. A support assembly 12 is provided inside the rear end of the joint body 11, and the interior of the support assembly 12 is filled with gas to improve the sealing of the joint mechanism 1.

[0042] See also Figure 1-Figure 5 The bellows mechanism 2 is used to compensate for pipeline thermal deformation, shock absorption, and absorption of pipeline settlement deformation. The bellows mechanism 2 consists of a bellows body 21 and a wire mesh sleeve 22. The outer wall of the bellows body 21 is provided with a number of annular corrugations, and the outside of the bellows body 21 is movably connected with the wire mesh sleeve 22. The setting of the wire mesh sleeve 22 can effectively protect the bellows body 21 and reduce the external mechanical damage to the bellows body 21. The end of the bellows body 21 is movably connected with the rear cavity of the joint body 11, and the end of the wire mesh sleeve 22 is in contact with the rear cavity wall of the joint body 11. The end of the bellows body 21 extends out of the port of the wire mesh sleeve 22, providing space for the stable connection of the bellows body 21 and the joint body 11.

[0043] See also Figure 1-Figure 3 、 Figure 6, locking ring 3, the locking ring 3 is movably sleeved on the outer wall of the joint mechanism 1 and the bellows mechanism 2, the locking ring 3 is made of flexible rubber material, and the locking ring 3 has a tight property, which is used to seal the connection point of the joint mechanism 1 and the bellows mechanism 2, reduce the gap size, and avoid leakage of the medium when the joint mechanism 1 and the bellows mechanism 2 are working.

[0044] The support assembly 12 includes:

[0045] See also Figure 2-Figure 3 、 Figure 5 、 Figure 7-10 , movable part 4, a movable groove is provided on the outer wall of the rear end of the joint body 11, and the joint body 11 is connected to the movable part 4 through the movable groove. The number of movable parts 4 is four, and the movable parts 4 are evenly arranged around the joint body 11, for providing power for a stable connection between the joint mechanism 1 and the bellows mechanism 2. The movable part 4 is composed of a movable membrane 41 and a movable plate 42. The bottom end of the movable membrane 41 is fixedly connected to the inner wall of the movable groove of the joint body 11. The movable membrane 41 is made of rubber, and the movable membrane 41 has the function of vertical deformation and can be vertically deformed under the action of external force. The top of the movable membrane 41 is fixedly connected to the movable plate 42, and the movable membrane 41 and the movable plate 42 are connected by a movable spring. The movable plate 42 is made of hard material, and the shape of the movable plate 42 is adapted to the curvature of the outer wall of the joint body 11, providing convenience for pushing the locking ring 3 into the outer wall of the joint mechanism 1.

[0046] See also Figure 2-Figure 3 、 Figures 8-10 , a first air pipe 5, one end of the first air pipe 5 is fixedly connected to the movable part 4, and the other end of the first air pipe 5 is fixedly connected to the sealing part 6, providing a communication path for the movable part 4 and the sealing part 6.

[0047] See also Figure 2-Figure 3 、 Figure 5 、 Figures 8-10, sealing member 6, the wall surface of the joint body 11 at the junction of the front cavity and the rear cavity is fixedly connected to one side of the sealing member 6, and the other side of the sealing member 6 is fitted with the bellows body 21, which is used to reduce the gap between the joint body 11 and the bellows body 21 and improve the sealing between the two. The sealing member 6 is composed of a sealing film 61 and a sealing ring 62. One side of the sealing film 61 is fixedly connected to the joint body 11, and the other side of the sealing film 61 is fitted with the bellows body 21. The shape of the sealing film 61 is annular, and the inner ring diameter of the sealing film 61 is equal to the front cavity diameter of the joint body 11, which effectively ensures the patency of the internal channel connection of the joint body 11, the sealing film 61 and the bellows body 21. The sealing film 61 is made of rubber, and the sealing film 61 has the function of lateral deformation and can be deformed under external force. Under the action of the force, it undergoes lateral deformation, one side of the sealing ring 62 is fitted with the inner wall of one side of the sealing membrane 61, and the side wall surface of the sealing membrane 61 is fixedly connected to the joint body 11, and the other side of the sealing ring 62 is fixedly connected to the inner wall of the other side of the sealing membrane 61, and the side wall surface of the sealing membrane 61 is fitted with the bellows body 21. A sealing groove is provided on one side of the sealing ring 62, and the sealing ring 62 is fixedly connected to one end of the sealing spring through the sealing groove, and the other end of the sealing spring is fixedly connected to the inner wall of the sealing membrane 61. When the sealing part 6 is compressed, the sealing spring is compressed, and the sealing ring 62 occupies the internal space of the sealing membrane 61. At the same time, the sealing ring 62 effectively blocks the first air pipe 5, thereby effectively reducing the gas in the movable part 4 from entering the sealing part 6, and preparing for the movable part 4 to fully push the limit part 8 to deform.

[0048] See also Figure 2-Figure 3 、 Figures 8-10 , the second air pipe 7, one end of the second air pipe 7 is fixedly connected to the movable part 4, and the other end of the second air pipe 7 is fixedly connected to the limiting part 8, providing a path for the communication between the movable part 4 and the limiting part 8.

[0049] See also Figure 2-Figure 3 、 Figure 5 、 Figures 8-10, the limit piece 8, the rear end inner wall of the joint body 11 is fixedly sleeved with the outer surface of the limit piece 8, and the inner surface of the limit piece 8 is fitted with the outer wall of the bellows body 21. The number of the limit pieces 8 is three, and they are linearly arranged inside the joint body 11, used to further reduce the gap between the joint body 11 and the bellows body 21, and improve the sealing between the two. The limit piece 8 is composed of a limit film 81 and a limit block 82. The outer ring of the limit film 81 is fixedly connected to the inner wall of the joint body 11. The limit film 81 is made of rubber, and the limit film 81 has the function of radial deformation and can be radially deformed under the action of external force. The outer wall and the inner wall of the limit film 81 are connected by a limit spring, and the elastic coefficient of the limit spring is larger than that of the movable spring, so that the limit film 81 can only be deformed when the movable part 4 is pressed. In order to produce expansion deformation, the limiting membrane 81 is annular in shape, and in the original state, the limiting membrane 81 and the limiting block 82 do not contact the bellows body 21, thereby preventing the limiting member 8 from affecting the movement of the bellows body 21 in the joint body 11. In the expanded state, the limiting block 82 is clamped with the bellows body 21, and the wall surface of the limiting membrane 81 contacts the outer wall of the bellows body 21, thereby enhancing the sealing between the joint body 11 and the bellows body 21. One end of the limiting block 82 is fixedly connected to the inner ring of the limiting membrane 81, and the other end of the limiting block 82 is movably clamped with the trough position of the bellows body 21. Four limiting blocks 82 are correspondingly provided for one limiting membrane 81, and the shape of the limiting block 82 is adapted to the shape of the bellows body 21, effectively enhancing the stability of the limiting block 82 in fixing the bellows body 21.

[0050] The usage of this application works as follows:

[0051] When the joint mechanism 1 and the bellows mechanism 2 are installed, the locking ring 3 is first sleeved on the outside of the bellows mechanism 2, and then the bellows mechanism 2 is trimmed so that the end of the bellows body 21 extends out of the port of the wire mesh sleeve 22, and then the bellows mechanism 2 is inserted into the interior of the joint body 11, so that the end of the wire mesh sleeve 22 is fully fitted with the inner wall of the joint body 11, and the end of the bellows body 21 pushes the seal 6 to compress until the sealing ring 62 completely fills the internal space of the sealing membrane 61, so that during the compression deformation of the seal 6, the gas therein is pushed into the movable part 4 through the first air pipe 5, so that the movable part 4 is filled with gas, providing sufficient force for the subsequent deformation of the limit part 8, and then, while keeping the relative positions of the joint body 11 and the bellows body 21 unchanged, part of the locking ring 3 is pulled from the outer wall of the bellows mechanism 2 to the outer wall of the joint mechanism 1, so that the locking ring 3 is effectively The connection point of the sealing joint mechanism 1 and the bellows mechanism 2 is sealed, and the locking ring 3 squeezes the expanded movable part 4, so that the movable part 4 is completely retracted into the movable groove of the joint body 11. At this time, the gas in the movable part 4 moves to the limit part 8 through the second air pipe 7, effectively pushing the limit membrane 81 to deform, and the limit block 82 is fully engaged with the outer wall trough of the bellows body 21. At this time, the joint body 11 and the bellows body 21 are stably connected. When the joint mechanism 1 and the bellows mechanism 2 are disassembled, if the locking ring 3 is still needed, the locking ring 3 is pushed back to the outside of the bellows mechanism 2. If the locking ring 3 is no longer needed, the locking ring 3 is cut open with a tool. At this time, the movable part 4 expands and the limit part 8 contracts, so that the joint body 11 and the bellows body 21 are no longer in a stable connection state. In summary, this device changes the traditional spiral tightening method, does not need to waste the staff's effort, saves time and effort.

[0052] When the joint mechanism 1 and the bellows mechanism 2 are in use, since a seal 6 is provided between the joint body 11 and the bellows body 21, the side wall of the seal 6 fully fits with the wall surface of the joint body 11 and the support assembly 12, effectively filling the gap between the joint body 11 and the bellows body 21. At the same time, the layered sealing of the limiter 8 and the external sealing of the locking ring 3 are adopted to further improve the sealing effect between the two. In summary, the triple setting of the present device is used to effectively reduce the gap between the joint mechanism 1 and the bellows mechanism 2, thereby ensuring the sealing effect between the two.

Claims

1. A metal bellows connection joint, characterized in that: include: A joint mechanism (1) is composed of a joint body (11) and a support assembly (12); a front cavity is provided at the front end of the joint body (11); a rear cavity is provided at the rear end of the joint body (11); the diameter of the front cavity of the joint body (11) is smaller than that of the rear cavity; an outer wall of the rear end port of the joint body (11) is obliquely arranged; a support assembly (12) is provided inside the rear end of the joint body (11); and gas is filled inside the support assembly (12) to improve the sealing performance of the joint mechanism (1); A bellows mechanism (2), the bellows mechanism (2) consisting of a bellows body (21) and a wire mesh sleeve (22), the outer wall of the bellows body (21) being provided with a plurality of annular corrugations, the outer portion of the bellows body (21) being movably sleeved with the wire mesh sleeve (22), the end of the bellows body (21) being movably sleeved with the rear cavity of the joint body (11), the end of the wire mesh sleeve (22) being in contact with the rear cavity wall of the joint body (11), and the end of the bellows body (21) extending out of the end of the wire mesh sleeve (22); A locking ring (3) is movably sleeved on the outer walls of the joint mechanism (1) and the bellows mechanism (2); the locking ring (3) is made of a flexible rubber material and has a contractile property, and is used to seal the connection point between the joint mechanism (1) and the bellows mechanism (2).

2. A metal bellows connection joint according to claim 1, characterized in that: The support assembly (12) comprises: A movable part (4), wherein a movable groove is formed on the rear end outer wall of the joint body (11), and the joint body (11) is connected to the movable part (4) via the movable groove. The number of the movable parts (4) is four, and the movable parts (4) are evenly arranged around the joint body (11), and are used to provide power for a stable connection between the joint mechanism (1) and the bellows mechanism (2); a first air pipe (5), one end of which is fixedly connected to the movable part (4) and provides a communication path between the movable part (4) and the sealing part (6); A sealing member (6) is fixedly connected to one side of the sealing member (6) on the wall surface of the joint body (11) located at the junction of the front cavity and the rear cavity, and the other side of the sealing member (6) is in contact with the bellows body (21) to reduce the gap between the joint body (11) and the bellows body (21), and the other end of the first air pipe (5) is fixedly connected to the sealing member (6); a second air pipe (7), one end of which is fixedly connected to the movable part (4), providing a communication path between the movable part (4) and the limiting part (8); A limiting member (8) is provided. The inner wall of the rear end of the joint body (11) is fixedly sleeved with the outer surface of the limiting member (8), and the inner surface of the limiting member (8) is in contact with the outer wall of the bellows body (21). The limiting members (8) are three in number and are linearly arranged inside the joint body (11) to further reduce the gap between the joint body (11) and the bellows body (21). The other end of the second air pipe (7) is fixedly connected to the limiting member (8).

3. A metal bellows connection joint according to claim 2, characterized in that: The movable part (4) comprises: A movable membrane (41), the bottom end of which is fixedly connected to the inner wall of the movable groove of the joint body (11), the movable membrane (41) being made of rubber and having a vertical deformation function; The movable plate (42) is fixedly connected to the top of the movable membrane (41), and the movable membrane (41) and the movable plate (42) are connected via a movable spring. The movable plate (42) is made of a hard material, and the shape of the movable plate (42) is adapted to the curvature of the outer wall of the joint body (11).

4. The metal bellows connection joint according to claim 3, characterized in that: The sealing member (6) comprises: A sealing membrane (61), one side of the sealing membrane (61) is fixedly connected to the joint body (11), and the other side of the sealing membrane (61) is in contact with the bellows body (21). The sealing membrane (61) is annular in shape, and the inner ring diameter of the sealing membrane (61) is equal to the front cavity diameter of the joint body (11). The sealing membrane (61) is made of rubber and has a transverse deformation function. A sealing ring (62), one side of the sealing ring (62) is in contact with the inner wall of one side of the sealing membrane (61), and the side wall surface of the sealing membrane (61) is fixedly connected to the joint body (11), the other side of the sealing ring (62) is fixedly connected to the inner wall of the other side of the sealing membrane (61), and the side wall surface of the sealing membrane (61) is in contact with the bellows body (21), a sealing groove is provided on one side of the sealing ring (62), the sealing ring (62) is fixedly connected to one end of a sealing spring through the sealing groove, and the other end of the sealing spring is fixedly connected to the inner wall of the sealing membrane (61).

5. The metal bellows connection joint according to claim 4, characterized in that: The limiting member (8) comprises: A limiting membrane (81), the outer ring of the limiting membrane (81) is fixedly connected to the inner wall of the joint body (11), the limiting membrane (81) is made of rubber, and the limiting membrane (81) has a radial deformation function, the outer wall and the inner wall of the limiting membrane (81) are connected by a limiting spring, and the elastic coefficient of the limiting spring is larger than that of the movable spring, the limiting membrane (81) is annular in shape, and in the original state, the limiting membrane (81) and the limiting block (82) are not in contact with the bellows body (21), and in the expanded state, the limiting block (82) is clamped with the bellows body (21); A limit block (82), one end of the limit block (82) is fixedly connected to the inner ring of the limit membrane (81), and the other end of the limit block (82) is movably engaged with the trough position of the bellows body (21), one limit membrane (81) is correspondingly provided with four limit blocks (82), and the shape of the limit block (82) is adapted to the shape of the bellows body (21).

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