Corrugated pipe expansion joint with length convenient to adjust

Abstract

The utility model discloses a corrugated pipe expansion joint convenient to adjust length, which comprises an expansion joint main body, a first flange arranged at one end of the expansion joint main body, a second flange arranged at the other end of the expansion joint main body, a first hole seat welded on the outer side of the circumference of the second flange, and a second hole seat arranged on the outer side of the circumference of the first flange, a first hole seat and a second hole seat are arranged on the expansion joint, a limiting rod used for adjusting the telescopic length range of the expansion joint penetrates through the position between the first hole seat and the second hole seat, a rack groove is formed in the outer side of the circumference of the limiting rod, and an adjusting sleeve is connected to the outer side of the limiting rod in a sliding and sleeved mode. The tooth blocks can be far away from and stop being meshed with the interiors of the rack grooves, then the adjusting sleeves can be moved freely along the limiting rods, convenience and rapidness are achieved, the situation of displacement caused by a traditional thread mode is effectively avoided through the mode that the tooth blocks are meshed with the rack grooves, and meanwhile the rack grooves are embedded in the inner sides of the limiting rods.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion joints, in particular to a corrugated expansion joint convenient for adjusting the length. Background Technique

[0002] An expansion joint refers to a flexible element that can effectively compensate for axial deformation. For example, the expansion joint welded on the shell of a fixed tube-sheet heat exchanger has a large axial flexibility and is easy to deform. It can compensate for the thermal expansion difference between the tube and the shell due to different wall temperatures, reduce their axial loads, thereby reducing the temperature difference stress of the tube, tube sheet and shell, and avoiding strength failure, instability failure and tube pull-off failure. There are many types of expansion joints, and the commonly used ones include wave-shaped, ring-plate welded and jacketed structures, etc. Among them, the wave-shaped expansion joint is the most widely used.

[0003] However, for the expansion joints on the current market, to protect the expansion joints, screw rods are usually connected between the flanges at both ends of the expansion joint and nuts are screwed on them to adjust and control the expansion and contraction length of the expansion joint. However, the method of screwing the nut on the screw rod is not only cumbersome to operate, but also the expansion joint will continuously expand and contract and squeeze the nut on the screw rod during use, so the nut is prone to displacement. Therefore, a corrugated expansion joint convenient for adjusting the length is provided to solve the above problems. Summary of the Utility Model

[0004] To solve the problems in the above background technique, the technical solution adopted by the utility model to solve the technical problems is: a corrugated expansion joint convenient for adjusting the length, which includes: an expansion joint main body, a first flange is arranged at one end of the expansion joint main body, a second flange is arranged at the other end of the expansion joint main body, a first hole seat is welded on the circumferential outer side of the second flange, a second hole seat is arranged on the circumferential outer side of the first flange, a limiting rod for adjusting the expansion and contraction length range of the expansion joint penetrates between the first hole seat and the second hole seat, a rack groove is opened on the circumferential outer side of the limiting rod, an adjusting sleeve is slidably sleeved on the outer side of the limiting rod, a chute is opened on the inner side of the adjusting sleeve opposite to the rack groove, and the adjusting sleeve is connected with a locking mechanism through the chute.

[0005] As a preferred technical solution of the utility model, the number of the rack grooves is two, the first hole seat corresponds to the second hole seat, and the number of both the first hole seat and the second hole seat is four.

[0006] As a preferred technical solution of the utility model, the inner diameter of the adjusting sleeve is the same as the outer diameter of the limiting rod, and a lining sleeve is sleeved inside the expansion joint main body.

[0007] As a preferred technical solution of the utility model, a welding joint is welded at one end of the lining sleeve inside the second flange, and the lining sleeve is fixedly connected to the inner side of the second flange through the welding joint.

[0008] As a preferred technical solution of the present utility model, the locking mechanism includes a limit block, a pull rod, a tooth block, and a spring. The limit block is slidably connected to the inner wall of the chute in a fitting manner. The tooth block is arranged at one end of the limit block, the pull rod is arranged at the other end of the limit block, and a spring is sleeved on one end of the pull rod located inside the chute.

[0009] As a preferred technical solution of the present utility model, a sphere is arranged at one end of the pull rod away from the limit block, and the tooth block penetrates through the adjusting sleeve and extends into the rack groove.

[0010] The present utility model has the following advantages: For the present utility model, only need to manually pull the pull rod on the corresponding adjusting sleeve outwards, then the tooth block can be far away from the rack groove and stop biting, and further, the adjusting sleeve can be moved freely along the limit rod, which is convenient and fast. Moreover, the situation of displacement that may occur in the traditional threaded manner is effectively avoided by the way that the tooth block bites the rack groove. At the same time, the rack groove is embedded inside the limit rod, effectively avoiding contact with the first hole seat and the second hole seat and causing wear. Description of the Drawings

[0011] Figure 1 is a schematic diagram of the internal structure of the expansion joint body of the preferred embodiment of the present utility model;

[0012] Figure 2 is a schematic diagram of the connection structure between the adjusting sleeve and the limit rod of the preferred embodiment of the present utility model;

[0013] Figure 3 is a schematic diagram of the partial sectional structure of the adjusting sleeve of the preferred embodiment of the present utility model.

[0014] Description of the reference numerals: 1. Expansion joint body; 2. First flange; 3. Second flange; 4. First hole seat; 5. Second hole seat; 6. Limit rod; 7. Rack groove; 8. Adjusting sleeve; 9. Chute; 10. Limit block; 11. Pull rod; 12. Tooth block; 13. Sphere; 14. Spring; 15. Liner sleeve; 16. Weld joint. Detailed Embodiment

[0015] Next, the technical solution of the present utility model will be described clearly and completely with reference to the drawings. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0016] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] The present utility model will be further described below with reference to the accompanying drawings.

[0018] Please refer to Figures 1-3 , a bellows expansion joint for facilitating length adjustment of the present utility model includes: an expansion joint main body 1, a first flange 2 is provided at one end of the expansion joint main body 1, a second flange 3 is provided at the other end of the expansion joint main body 1, a first hole seat 4 is welded to the outer circumference of the second flange 3, a second hole seat 5 is provided on the outer circumference of the first flange 2, a limiting rod 6 for adjusting the telescopic length range of the expansion joint is penetrated between the first hole seat 4 and the second hole seat 5, a rack groove 7 is formed on the outer circumference of the limiting rod 6, an adjusting sleeve 8 is slidably sleeved on the outer side of the limiting rod 6, a chute 9 is formed on one side of the inner part of the adjusting sleeve 8 opposite to the rack groove 7, and the adjusting sleeve 8 is connected with a locking mechanism through the chute 9.

[0019] Combined with Figure 1 and Figure 2 As shown, the number of the rack grooves 7 is set to two, the first hole seat 4 corresponds to the second hole seat 5, the numbers of the first hole seat 4 and the second hole seat 5 are both set to four, the inner diameter of the adjusting sleeve 8 is the same as the outer diameter of the limiting rod 6, so as to facilitate the stable fit between the adjusting sleeve 8 and the limiting rod 6. An inner lining sleeve 15 is sleeved inside the expansion joint main body 1, a welding joint 16 is welded at one end of the inner lining sleeve 15 on the inner side of the second flange 3, and the inner lining sleeve 15 is fixedly connected to the inner side of the second flange 3 through the welding joint 16. Through the inner lining sleeve 15, impurities remaining on the inner side of the corrugation on the expansion joint main body 1 can be effectively avoided.

[0020] Combined with Figure 3 As shown, the locking mechanism includes a limiting block 10, a pull rod 11, a tooth block 12, and a spring 14. The limiting block 10 is in sliding fit with the inner wall of the chute 9, the tooth block 12 is arranged at one end of the limiting block 10, the pull rod 11 is arranged at the other end of the limiting block 10, a spring 14 is sleeved on one end of the pull rod 11 located inside the chute 9, and a sphere 13 is arranged at one end of the pull rod 11 away from the limiting block 10. The movement range of the pull rod 11 can be restricted by the limiting block 10, the tooth block 12 penetrates through the adjusting sleeve 8 and extends into the rack groove 7, and under the elastic force of the spring 14, the limiting block 10 can be pushed, and the limiting block 10 can push the tooth block 12 to engage in the rack groove 7.

[0021] Specifically, for the present utility model, when it is necessary to adjust the telescopic length range of the expansion joint main body 1, only need to manually pull the pull rod 11 on the corresponding adjusting sleeve 8 outwards, and then the pull rod 11 drives the limit block 10 to move along the sliding groove 9, and then the limit block 10 drives the toothed block 12 to move, and then the toothed block 12 moves away from the inside of the stop engaging rack groove 7, so that the adjusting sleeve 8 can be moved along the limit rod 6 at will, which is convenient and fast.

[0022] The above is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present utility model.

[0023] Other parts not described in detail in the present utility model belong to the prior art, so they will not be elaborated here.

[0024] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A bellows expansion joint that is easy to adjust in length, comprising: An expansion joint body (1) is characterized in that a first flange (2) is provided at one end of the expansion joint body (1), and a second flange (3) is provided at the other end of the expansion joint body (1); a first hole seat (4) is welded on the outer circumference of the second flange (3); a second hole seat (5) is provided on the outer circumference of the first flange (2); a limit rod (6) for adjusting the telescopic length range of the expansion joint is passed through the first hole seat (4) and the second hole seat (5); a rack groove (7) is provided on the outer circumference of the limit rod (6); an adjustment sleeve (8) is slidably sleeved on the outer side of the limit rod (6); a slide groove (9) is provided on the side of the adjustment sleeve (8) facing the rack groove (7); and the adjustment sleeve (8) is connected to a locking mechanism through the slide groove (9).

2. A bellows expansion joint that is easy to adjust in length as claimed in claim 1, characterized in that: The rack grooves (7) are provided with two in number, the first hole seat (4) corresponds to the second hole seat (5), and the first hole seat (4) and the second hole seat (5) are both provided with four in number.

3. A bellows expansion joint that is easy to adjust in length as claimed in claim 1, characterized in that: The inner diameter of the adjusting sleeve (8) is the same as the outer diameter of the limiting rod (6), and an inner lining sleeve (15) is sleeved inside the expansion joint body (1).

4. A bellows expansion joint that is easy to adjust in length as claimed in claim 1, characterized in that: A welding opening (16) is welded on one end of the inner sleeve (15) on the inner side of the second flange (3), and the inner sleeve (15) is fixedly connected to the inner side of the second flange (3) via the welding opening (16).

5. A bellows expansion joint that is easy to adjust in length as claimed in claim 1, characterized in that: The locking mechanism comprises a limit block (10), a pull rod (11), a tooth block (12), and a spring (14); the limit block (10) is slidably connected to the inner wall of the slide groove (9); the tooth block (12) is arranged at one end of the limit block (10); the pull rod (11) is arranged at the other end of the limit block (10); and one end of the pull rod (11) located inside the slide groove (9) is sleeved with the spring (14).

6. A bellows expansion joint that is easy to adjust in length as claimed in claim 5, characterized in that: The pull rod (11) is provided with a sphere (13) at one end away from the limiting block (10), and the tooth block (12) penetrates the adjustment sleeve (8) and extends to the inside of the rack groove (7).

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