Metal expansion joint

Abstract

The metal expansion joint comprises a lining pipe, a corrugated pipe and an outer sleeve which are sequentially arranged from inside to outside, the corrugated pipe comprises a first pipe part and a second pipe part which are arranged at the two ends of the corrugated pipe, and the lining pipe comprises an inlet part connected with the first pipe part in an attached mode and an outlet part extending to the second pipe part; the inlet part and the first pipe part are in positioning connection through a positioning structure, and the mounting clamping sleeve is fixedly arranged on the inlet part and the first pipe part in a sleeving mode and wraps the positioning structure. By the adoption of the technical scheme, reliable connection between the lining pipe and the corrugated pipe is achieved, a traditional welding mode is avoided, the installation process is simplified, rapid installation and disassembly between the lining pipe and the corrugated pipe are facilitated, the assembly efficiency is improved, the installation and connection of the lining pipe and the corrugated pipe can be limited and prevented through the installation clamping sleeve, and the service life of the lining pipe and the corrugated pipe is prolonged. Therefore, later maintenance of the lining pipe and the corrugated pipe is facilitated, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of compensators, in particular to a metal expansion joint. Background Art

[0002] Metal expansion joints, also known as compensators, are a flexible structure installed on container shells or pipelines to compensate for additional stress caused by temperature differences and mechanical vibrations. They are an important component in the connection pipelines of modern industrial equipment. This expansion joint can use its own elastic expansion and contraction function to compensate for axial, angular, lateral and their combined displacements caused by thermal deformation, mechanical deformation and various mechanical vibrations.

[0003] Existing metal expansion joints include a bellows, an outer mesh sleeve, a guide tube, and a quick-connect ring. The effective expansion and contraction deformation of the working body bellows can reduce shock and noise. The outer mesh sleeve is placed on the outside of the main bellows to protect the bellows. A steel wire mesh sleeve is usually used. The guide tube is placed on the inside of the bellows to guide the flow. There are two guide tubes in the bellows. One end of the two guide tubes is welded to the two ends of the bellows respectively, and they can move relative to each other along the axial direction when the bellows is axially compensated. However, the existing metal expansion joints still have the following problems in actual use: the welding process between the guide tube and the bellows is complicated, the installation is relatively cumbersome, the installation efficiency is low, and the maintenance of the guide tube in the later stage is difficult, which leads to the scrapping of the entire product and waste of resources. Utility Model Content

[0004] To this end, the purpose of the present invention is to overcome the deficiencies in the prior art, thereby providing a metal expansion joint that can achieve rapid installation and disassembly between the liner pipe and the bellows, improve assembly efficiency, facilitate the later maintenance of the liner pipe and the bellows, reduce costs, and enhance product performance and life.

[0005] To achieve the above-mentioned purpose, the utility model provides a metal expansion joint, comprising an inner liner pipe, a bellows and an outer sleeve arranged in sequence from the inside to the outside, the bellows comprising a first pipe portion and a second pipe portion extending axially at both ends thereof, and a plurality of corrugated portions connected between the first pipe portion and the second pipe portion, the inner liner pipe comprising an inlet portion fittedly connected to the first pipe portion, and an outlet portion extending to the second pipe portion; the inlet portion and the first pipe portion are maintained in position and connected by a positioning structure, the positioning structure comprising a plurality of positioning grooves arranged on the first pipe portion, and a plurality of positioning buckles correspondingly arranged on the inlet portion and forming a positioning match with the plurality of positioning grooves; and also comprising an installation sleeve fixedly sleeved on the inlet portion and the first pipe portion and covering the positioning structure.

[0006] As a preferred solution, a plurality of positioning buckles are circumferentially spaced apart on the outer peripheral side wall of the inlet portion, and a plurality of positioning grooves are circumferentially spaced apart on the first tube portion and engaged with the plurality of positioning buckles.

[0007] As a preferred solution, the mounting sleeve has a clamping groove clamped on the inlet portion and the first pipe portion.

[0008] As a preferred solution, the mounting sleeve includes a threaded interface connected to the inlet portion.

[0009] As a preferred solution, the mounting sleeve includes an inner annular sleeve and an outer annular sleeve formed on both sides of the clamping groove, the inner annular sleeve is matched and inserted into the inlet portion, and the threaded interface is provided on the inner annular sleeve.

[0010] As a preferred solution, the outer annular sleeve is matchedly mounted on the first tube portion and covers the positioning groove, and the outer annular sleeve is sealed and connected to the outer sleeve.

[0011] As a preferred solution, the mounting sleeve is fixedly connected to the inlet portion and the first pipe portion by riveting.

[0012] As a preferred solution, a locking structure is provided between the mounting sleeve and the inlet portion and the first tube portion, and the locking structure includes a locking hole provided on the outer peripheral side wall of the mounting sleeve, and a corresponding connecting hole provided on the first tube portion and opposite to the locking hole, and a locking member fastened and passed through the locking hole and the connecting hole.

[0013] As a preferred solution, the outer sleeve includes a first sleeve fixedly connected to the first pipe part, and a second sleeve fixedly connected to the second pipe part. The first sleeve and the second sleeve form a movable sleeve connection, and a sealant layer is provided at the connection between the first sleeve and the mounting sleeve.

[0014] As a preferred solution, the inner lining pipe includes a guide portion extending and connecting the inlet portion and the outlet portion, the pipe diameter of the guide portion is smaller than the pipe diameter of the inlet portion, and a certain distance is maintained between the guide portion and the plurality of corrugated portions.

[0015] Compared with the existing technology, the technical solution of this utility model has the following advantages:

[0016] 1. In the metal expansion joint provided by the present invention, when installing the liner pipe and the bellows, the inlet portion of the liner pipe and the first pipe portion of the bellows are positioned and connected through the positioning structure, so that the liner pipe and the bellows are positioned and assembled together, and then the installation sleeve is fixedly sleeved on the inlet portion and the first pipe portion to limit and clamp the liner pipe and the bellows. The installation sleeve can not only seal and cover the position of the positioning structure to avoid exposure, but also limit and prevent the installation connection of the liner pipe and the bellows from loosening. Such an installation design realizes a reliable connection between the liner pipe and the bellows, has good compressive strength, avoids the use of traditional welding methods, simplifies the installation process, facilitates quick installation and disassembly between the liner pipe and the bellows, and improves assembly efficiency. This is beneficial to the later maintenance of the liner pipe and the bellows, avoids waste of product resources, is more environmentally friendly, reduces costs, and improves product performance and life.

[0017] 2. In the metal expansion joint provided by the present invention, the mounting sleeve includes a threaded interface connected to the inlet portion, through which an external pipe or mounting joint can be connected, thereby realizing rapid installation and connection of the metal expansion joint.

[0018] 3. In the metal expansion joint provided by the utility model, a connecting hole is provided on the outer peripheral side wall of the mounting sleeve, and corresponding locking holes opposite to the connecting holes are provided on the inlet part and the first pipe part. During installation, the mounting sleeve is first put on the end connecting the bellows and the inner liner pipe, the inlet part and the first pipe part are clamped to each other by the mounting sleeve, and then the locking piece is passed through the connecting hole and fixed in the locking hole. This installation prevents the mounting sleeve from loosening from the inlet part and the first pipe part, plays a role of limiting and stopping, and ensures the installation stability and reliability of the mounting sleeve.

[0019] 4. In the metal expansion joint provided by the present invention, the outer sleeve is composed of a first sleeve and a second sleeve relatively arranged on the outside of the bellows. Since the first sleeve and the second sleeve are relatively sleeved and connected, the first sleeve and the second sleeve can move relative to each other when the bellows undergoes expansion and contraction displacement. Such first sleeve and second sleeve have good structural strength, and are wrapped around the outside of the bellows to protect the bellows from being damaged by external forces, and play a protective role on the bellows body, thereby ensuring the compensation effect of the bellows producing stretching, displacement and bending in a vibrating working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0021] Figure 1 A schematic diagram of the cross-sectional structure of the metal expansion joint provided by the utility model;

[0022] Figure 2 A schematic diagram of the installation structure of the mounting sleeve provided by the utility model;

[0023] Figure 3 This is a schematic diagram of the installation structure of another installation method of the ferrule provided by the utility model.

[0024] Explanation of the accompanying drawings: 1. Inner lining pipe; 11. Inlet; 12. Outlet; 13. Guide; 2. Bellows; 21. First pipe; 22. Second pipe; 23. Bellows; 3. Outer sleeve; 31. First sleeve; 32. Second sleeve; 4. Mounting sleeve; 41. Threaded interface; 42. Inner annular sleeve; 43. Outer annular sleeve; 5. Positioning structure; 51. Positioning buckle; 6. Locking piece; 7. Sealant layer. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components.

[0028] Example

[0029] The present embodiment will be described in detail below with reference to the accompanying drawings:

[0030] This embodiment provides Figure 1-3A metal expansion joint is shown, comprising an inner lining pipe 1, a bellows 2 and an outer sleeve 3 arranged in sequence from the inside to the outside, the bellows 2 comprising a first pipe portion 21 and a second pipe portion 22 extending axially at both ends thereof, and a plurality of corrugated portions 23 connected between the first pipe portion 21 and the second pipe portion 22, the inner lining pipe 1 comprising an inlet portion 11 fittedly connected to the first pipe portion 21, and an outlet portion 12 extending to the second pipe portion 22; the inlet portion 11 and the first pipe portion 21 are maintained in position and connected by a positioning structure 5, the positioning structure 5 comprising a plurality of positioning grooves arranged on the first pipe portion 21, and a plurality of positioning buckles 51 correspondingly arranged on the inlet portion 11 and forming a positioning match with the plurality of positioning grooves; and further comprising an installation sleeve 4 fixedly sleeved on the inlet portion 11 and the first pipe portion 21 and covering the positioning structure 5.

[0031] In the above embodiment, when installing the liner pipe 1 and the bellows 2, the inlet portion of the liner pipe 1 and the first pipe portion of the bellows 2 are positioned and connected through the positioning structure 5, so that the liner pipe 1 and the bellows 2 are positioned and assembled together, and then the installation sleeve 4 is fixedly sleeved on the inlet portion 11 and the first pipe portion 21 to limit and clamp the liner pipe 1 and the bellows 2. The installation sleeve 4 can not only seal and cover the position of the positioning structure to avoid exposure, but also limit and prevent the installation connection of the liner pipe 1 and the bellows 2 from loosening. Such an installation design realizes a reliable connection between the liner pipe 1 and the bellows 2, has good compressive strength, avoids the use of traditional welding methods, simplifies the installation process, facilitates rapid installation and disassembly between the liner pipe and the bellows, and improves assembly efficiency. This is beneficial to the later maintenance of the liner pipe and the bellows, avoids waste of product resources, is more environmentally friendly, reduces costs, and improves product performance and life.

[0032] As a preferred embodiment, a plurality of positioning buckles 51 are arranged on the outer peripheral side wall of the entrance portion 11 at intervals along the circumferential direction, and a plurality of positioning grooves are arranged on the first tube portion 21 at intervals along the circumferential direction. With this structural arrangement, the entrance portion 11 and the first tube portion 21 are positioned and connected by a plurality of positioning buckles 51 and a plurality of positioning grooves in cooperation with each other, and the positioning effect is good. The mounting sleeve 4 is in a circular ring shape and is adapted to be fitted onto the entrance portion 11 and the first tube portion 21, thereby covering the plurality of positioning buckles and the plurality of positioning grooves, thereby protecting the clamping position between the entrance portion 11 and the first tube portion 21.

[0033] The following combination Figure 1-3 The specific setting method of the installation sleeve is described in detail:

[0034] The mounting sleeve 4 includes a clamping groove clamped on the inlet portion 11 and the first pipe portion 21, and an inner annular sleeve 42 and an outer annular sleeve 43 formed on both sides of the clamping groove, the inner annular sleeve 42 is matched and inserted into the inlet portion 11, the outer annular sleeve 43 is matched and sleeved on the first pipe portion 21 and covers the positioning groove position, the outer annular sleeve 43 is sealed and connected to the outer sleeve 3, and the clamping groove is an annular groove structure with an opening toward the inlet portion 11 and the first pipe portion 21. This structural arrangement allows the inlet portion 11 and the first pipe portion 21 to be clamped to each other through the mounting sleeve 4, thereby improving the connection strength between the inner liner pipe 1 and the corrugated pipe 2, and ensuring that the first pipe portion 21 of the corrugated pipe 2 remains tightly connected to the inlet portion 11 of the inner liner pipe 1.

[0035] It is further preferred that the mounting sleeve 4 includes a threaded interface 41 connected to the inlet portion 11, specifically, the threaded interface 41 is arranged on the inner annular sleeve 42, and an external pipe or mounting joint can be connected through the threaded interface 41, thereby realizing rapid installation and connection of the metal expansion joint.

[0036] In order to prevent the installation sleeve 4 from being separated from the inlet portion 11 and the first pipe portion 21, a locking structure is provided between the installation sleeve 4 and the inlet portion 11 and the first pipe portion 21. Figure 3 The locking structure includes a locking hole provided on the outer peripheral side wall of the mounting sleeve 4, a corresponding connecting hole provided on the first pipe portion 21 and opposite to the locking hole, and a locking member 6 fastened through the locking hole and the connecting hole, wherein the locking hole is preferably a threaded hole, and the locking member 6 is a jackscrew structure or a screw structure, and the locking hole is provided through the outer annular sleeve 43 of the mounting sleeve 4, so that the jackscrew structure or the screw structure is inserted into the connecting hole and fits against the outer wall of the inlet portion 11. With this structural arrangement, during installation, the mounting sleeve 4 is first sleeved onto one end of the corrugated pipe 2 connected to the inner liner pipe 1, and the inlet portion and the first pipe portion are clamped to each other by the mounting sleeve 4. Then, the locking member 6 cooperates with the locking hole to prevent the mounting sleeve 4 from loosening from the inlet portion 11 and the first pipe portion 21, thereby playing a role of limiting and stopping, and ensuring the installation stability and reliability of the mounting sleeve.

[0037] Although the above-mentioned mounting ferrule 4 adopts a locking structure to achieve fixed sleeve installation on the corrugated pipe 2 and the inner liner pipe 1, it is obvious that there can be other different installation methods. As an alternative embodiment, the mounting ferrule 4 is fixedly connected to the inlet portion 11 and the first pipe portion 21 by riveting, that is, the mounting ferrule 4 is connected to the end of the corrugated pipe 2 connected to the inner liner pipe 1 by a riveting process, thereby preventing the mounting ferrule 4 from loosening. Those skilled in the art can make a choice of the specific setting method of the mounting ferrule 4 based on the above description, and other equivalent embodiments will not be described one by one here.

[0038] In this embodiment, combined with Figure 1-2 As shown, the outer sleeve 3 includes a first sleeve 31 fixedly connected to the first pipe portion 21, and a second sleeve 32 fixedly connected to the second pipe portion 22. The first sleeve 31 and the second sleeve 32 form a movable sleeve connection. A sealant layer 7 is provided at the connection between the first sleeve 31 and the mounting sleeve 4. The sealant layer 7 realizes the sealing of the connection between the mounting sleeve 4 and the first sleeve 31. This structural arrangement, according to which the first sleeve 31 and the second sleeve 32 are relatively sleeved and connected, enables the first sleeve 31 and the second sleeve 32 to move relative to each other when the bellows 2 undergoes telescopic displacement. Such first sleeve 31 and second sleeve 32 have good structural strength, and are coated on the outside of the bellows to protect the bellows from being damaged by external force, thereby protecting the bellows body, thereby ensuring the compensation effect of the stretching, displacement and bending generated by the bellows in a vibrating working environment.

[0039] like Figure 1 As shown, the inner liner pipe 1 includes a guide portion 13 extending and connecting the inlet portion 11 and the outlet portion 12. The pipe diameter of the guide portion 13 is smaller than the pipe diameter of the inlet portion 11. A certain distance is maintained between the guide portion 13 and the plurality of corrugated portions 23, so that the inner liner pipe 1 does not have any contact with the corrugated portions 23 of the bellows 2. According to the fact that the conveying medium flows unidirectionally from the inlet portion 11 to the outlet portion 12 of the inner liner pipe 1, this structural setting can play a good buffering and drainage role by setting a single inner liner pipe, thereby ensuring the smooth flow of the conveying medium and reducing the impact on the bellows 2, thereby effectively avoiding the collision and friction between particles or dust contained in the conveying medium and the bellows. The overall anti-load capacity is strong, so that the bellows compensation avoids rapid expansion during the conveying medium, thereby improving the product performance.

[0040] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A metal expansion joint comprising an inner liner pipe (1), a bellows (2) and an outer sleeve (3) arranged in sequence from the inside to the outside, wherein the bellows (2) comprises a first pipe portion (21) and a second pipe portion (22) extending axially at both ends thereof, and a plurality of bellows (23) connected between the first pipe portion (21) and the second pipe portion (22), characterized in that: The inner lining pipe (1) includes an inlet portion (11) that is fitted and connected to the first pipe portion (21), and an outlet portion (12) that extends to the second pipe portion (22); the inlet portion (11) and the first pipe portion (21) are kept in position and connected by a positioning structure (5), and the positioning structure (5) includes a plurality of positioning grooves arranged on the first pipe portion (21), and a plurality of positioning buckles (51) correspondingly arranged on the inlet portion (11) and forming a positioning match with the plurality of positioning grooves; and also includes an installation sleeve (4) fixedly mounted on the inlet portion (11) and the first pipe portion (21) and covering the positioning structure (5).

2. The metal expansion joint according to claim 1, characterized in that: A plurality of positioning buckles (51) are arranged at intervals along the circumferential direction on the outer peripheral side wall of the inlet portion (11), and a plurality of positioning grooves are arranged at intervals along the circumferential direction on the first tube portion (21) and are engaged with the plurality of positioning buckles (51).

3. The metal expansion joint according to claim 1, characterized in that: The mounting sleeve (4) has a clamping groove clamped on the inlet portion (11) and the first pipe portion (21).

4. The metal expansion joint according to claim 3, characterized in that: The mounting sleeve (4) comprises a threaded interface (41) communicating with the inlet portion (11).

5. The metal expansion joint according to claim 4, characterized in that: The mounting sleeve (4) comprises an inner annular sleeve (42) and an outer annular sleeve (43) formed on both sides of the clamping groove, the inner annular sleeve (42) is matched and inserted into the inlet portion (11), and the threaded interface (41) is arranged on the inner annular sleeve (42).

6. The metal expansion joint according to claim 5, characterized in that: The outer annular sleeve (43) is matched with the first tube portion (21) and covers the positioning groove. The outer annular sleeve (43) is sealed and connected to the outer sleeve (3).

7. The metal expansion joint according to any one of claims 1 to 6, characterized in that: The mounting sleeve (4) is fixedly connected to the inlet portion (11) and the first pipe portion (21) by riveting.

8. The metal expansion joint according to any one of claims 1 to 6, characterized in that: A locking structure is provided between the mounting sleeve (4), the inlet portion (11) and the first pipe portion (21), the locking structure comprising a locking hole provided on the outer peripheral side wall of the mounting sleeve (4), a connecting hole correspondingly provided on the first pipe portion (21) and opposite to the locking hole, and a locking member (6) fastened and passed through the locking hole and the connecting hole.

9. The metal expansion joint according to claim 1, characterized in that: The outer sleeve (3) comprises a first sleeve (31) fixedly connected to the first pipe portion (21), and a second sleeve (32) fixedly connected to the second pipe portion (22), wherein the first sleeve (31) and the second sleeve (32) form a movable sleeve connection, and a sealing rubber layer (7) is provided at the connection between the first sleeve (31) and the mounting sleeve (4).

10. The metal expansion joint according to claim 1, characterized in that: The inner lining pipe (1) comprises a guide portion (13) extending and connecting the inlet portion (11) and the outlet portion (12); the pipe diameter of the guide portion (13) is smaller than the pipe diameter of the inlet portion (11); and a certain distance is maintained between the guide portion (13) and the plurality of corrugated portions (23).

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