CN219889010U - Conjoined short-distance transverse expansion joint - Google Patents

Abstract

The utility model discloses a conjoined short-distance transverse expansion joint, which comprises two sections of corrugated pipes, a middle straight pipe, a connecting flange and a pull rod, wherein the two sections of corrugated pipes and the middle straight pipe are integrally formed, a multi-ring convex structure is formed on the circumferential side wall of the middle straight pipe at intervals, the cross section of the convex structure is in an arc shape, the structural strength and toughness of the middle straight pipe are improved by the structural design, the problem that the middle straight pipe is distorted or even broken due to overlarge stress is effectively solved, the load bearing capacity of the middle straight pipe between the two sections of corrugated pipes is improved, the torsion resistance is strong, the structural stability is good, the service life is long, the expansion joint adopting the technical scheme can absorb transverse displacement in any plane through the angular deflection of the two sections of corrugated pipes, the compensation capacity is large, the structure is relatively simple, and the expansion joint is suitable for L-shaped and Z-shaped pipe sections with large displacement amounts.

Description

Conjoined short-distance transverse expansion joint

Technical Field

The utility model relates to the technical field of expansion joints, in particular to a conjoined short-distance transverse expansion joint.

Background

Expansion joints are a flexible structure provided on the vessel shell or pipe in order to compensate for additional stresses caused by temperature differences and mechanical vibrations. The effective expansion and contraction deformation of the corrugated pipe of the working main body is utilized to absorb the dimensional changes of pipelines, ducts, containers and the like caused by expansion due to heat, contraction due to cold and the like, or compensate the axial, transverse and angular displacement of the pipelines, ducts, containers and the like.

The existing large-pull-rod transverse expansion joint takes a corrugated pipe as a pipeline fitting for conveying various fluids, and consists of two corrugated pipes, a middle connecting pipe, two flanges, a guide cylinder, a large pull rod and other parts, wherein the middle pipe is connected between the two corrugated pipes, the two flanges are respectively connected to the connecting pipes at one ends of the two corrugated pipes, the two flanges are connected together by the large pull rod, and the two corrugated pipes and the middle pipe are welded and connected. Although this transverse expansion joint can function as a transverse displacement compensation by angular deflection of the bellows, there are also the following problems: 1. the two corrugated pipes and the middle pipe are usually connected by welding, the working procedure is complex, the product welding beads are numerous, and particularly, the middle pipe is pressed when the corrugated pipe deflects transversely, so that the middle pipe is stressed greatly, the wall of the middle pipe is thinner, and the middle pipe is easily subjected to overlarge stress to be distorted, deformed and even broken and damaged; 2. in the prior art, in order to obtain a larger transverse compensation amount, the number of the corrugated pipes needs to be made larger, and the wave distance of the corresponding corrugated pipes is made smaller at the same distance, so that when the corrugated pipes transversely deflect, the top positions among a plurality of the corrugated pipes are easy to generate extrusion collision phenomena, and the corrugated pipes are damaged.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to solve the problems that two corrugated pipes and a middle pipe in the prior art are usually connected by welding, the working procedure is complex, the product weld beads are numerous, and the middle pipe is subjected to large stress on the two corrugated pipe fittings, so that the middle pipe is easy to be subjected to excessive stress to be distorted, deformed and even broken and damaged.

In order to solve the technical problems, the utility model provides a conjoined short-distance transverse expansion joint, which comprises two sections of corrugated pipes, a middle straight pipe connected between the two sections of corrugated pipes, and two connecting flanges respectively arranged at one ends of the two sections of corrugated pipes, wherein a pull rod is arranged between the two connecting flanges, two spherical nuts respectively fastened and pressed on the two connecting flanges are connected at two ends of the pull rod in a threaded manner, the middle straight pipe and the two sections of corrugated pipes are integrally formed, a multi-ring convex structure is formed on the circumferential side wall of the middle straight pipe at intervals, the cross section of the convex structure is in an arc shape, and the height h1 of the corrugated protrusion of the corrugated pipe is larger than the height h3 of the convex structure.

As a preferable mode, the corrugated protrusion of the corrugated pipe has a cross-sectional shape with a wide bottom and a narrow top.

As a preferable scheme, the corrugated bulge comprises a lower body and an upper V-shaped body which are connected up and down, the top end of the upper V-shaped body is an arc end, and the width of the bottom end of the upper V-shaped body is equal to the width of the lower body.

As a preferred embodiment, the height h1 of the corrugation lobes is twice the height h2 of the lower body.

As a preferred solution, the height h3 of the protruding structure is one fourth of the height h1 of the corrugated protrusion, and the bottom width distance of the protruding structure is multiple times of the wave pitch of the corrugated tube.

As a preferable scheme, the middle straight pipe and the two sections of corrugated pipes are integrally manufactured by at least one layer of stainless steel pipe blank in a hydraulic expansion mode.

As a preferred scheme, the corrugated pipe further comprises guide cylinders which are arranged inside the two corrugated pipes and the middle straight pipe in an extending mode, the guide cylinders are formed by sequentially buckling steel belts with multiple sections of S-shaped structures, straight-edge connecting pipes are formed at one ends, far away from the middle straight pipe, of the corrugated pipes, and the connecting flange is welded and sleeved on the straight-edge connecting pipes.

As a preferred scheme, the connecting flange comprises an inner diameter hole and a plurality of flange holes which are arranged at intervals around the inner diameter hole, wherein a step structure is arranged in the inner diameter hole, and comprises a first annular step for welding the straight-edge connecting pipe and a second annular step for welding the guide cylinder.

As a preferable scheme, the connecting flange further comprises at least one pair of protruding parts symmetrically arranged about the center of the inner diameter hole, a pair of pull rod holes suitable for the pull rod to pass through are arranged on the protruding parts, and the connecting line of the pull rod holes passes through the center of the inner diameter hole and is staggered with the flange hole.

As a preferable scheme, a conical surface structure is arranged at the port of the pull rod hole, one end of the spherical nut is a plane end, and the other end of the spherical nut is a spherical end matched and abutted to the conical surface structure.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

1. according to the conjoined short-distance transverse expansion joint, the integral structural forming is realized by adopting the hydraulic expansion mode according to the middle straight pipe and the two sections of corrugated pipes, the purpose of transverse displacement compensation is met, the product welding bead is reduced, the processing is convenient, the welding leakage risk is reduced, the cost is reduced, the multi-ring convex structures with the circular arc cross sections are formed on the circumferential side wall of the middle straight pipe, and are distributed at intervals along the length direction of the middle straight pipe.

2. In the conjoined short-distance transverse expansion joint, the cross section shape of the corrugated bulge of the corrugated pipe is wide at the bottom and narrow at the top, and particularly the corrugated bulge is formed by connecting a lower body and an upper V-shaped body.

3. In the conjoined short-distance transverse expansion joint provided by the utility model, the guide cylinder is arranged in the two corrugated pipes and the middle straight pipe and is formed by sequentially buckling a plurality of sections of steel belts in an S-shaped structure, the guide cylinder adopts the S-shaped inner buckling winding steel belts which are of a non-sealing piece, and the guide cylinder cannot be damaged due to the fact that the guide cylinder cannot bear pressure when a pipeline bears pressure, the guide cylinder is designed to keep stable medium flowing in the corrugated pipes and reduce friction between the inner walls of the corrugated pipes and the medium, and the guide cylinder has the capability of absorbing transverse displacement when the expansion joint compensates the transverse displacement, so that the guide cylinder can be well jointed and moved along the pipeline of the transverse displacement.

4. In the conjoined short-distance transverse expansion joint provided by the utility model, the step structure layered design is adopted at the inner diameter hole of the connecting flange, the straight edge connecting pipe of the corrugated pipe is welded at the position of the first annular step, and one end of the guide cylinder is welded at the position of the first annular step, so that two welding beads are staggered and distributed by design, the mutual influence of the two welding beads is avoided, the welding bead strength is ensured, and the structural stability is good.

5. In the conjoined short-distance transverse expansion joint provided by the utility model, the connecting flange is symmetrically provided with the pair of protruding parts about the center of the inner diameter hole of the connecting flange, the pair of protruding parts are provided with the pair of pull rod holes for connecting the two pull rods, when the pull rods are matched and installed with the connecting pulling method, the spherical end of the spherical nut is just abutted against the conical surface structure of the port of the pull rod hole, and the spherical nut is in multidirectional sliding fit with the conical surface structure to achieve the effect of transversely deflecting the pull rods to match with two corrugated pipes, so that the transverse short-distance expansion joint achieves the transverse deflection of the pull rods by the angular deformation of the two corrugated pipes and the transverse deflection of the pull rods by the cooperation of the spherical nut and the conical surface structure in a way that the middle straight section is not deformed, and the requirement of transverse displacement compensation of a pipeline is met.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a semi-sectional structure of a body short range lateral expansion joint of the present utility model;

FIG. 2 is a schematic view of a partial enlarged structure of the body short-distance lateral expansion joint shown in FIG. 1;

FIG. 3 is a schematic view of the bellows and intermediate straight tube of the present utility model;

FIG. 4 is a schematic plan view of a flange according to the present utility model;

FIG. 5 is a schematic cross-sectional view of a flange according to the present utility model;

FIG. 6 is a schematic view of the mounting structure of the conjoined short-distance transverse expansion joint of the present utility model;

reference numerals illustrate: 1. a bellows; 10. a corrugated protrusion; 11. a lower body; 12. an upper V-shaped body; 2. a middle straight pipe; 21. a bump structure; 3. a connecting flange; 31. an inner diameter hole; 32. a flange hole; 33. a protruding portion; 34. a pull rod hole; 35. a conical surface structure; 4. a pull rod; 5. a spherical nut; 6. a guide cylinder; 7. a straight edge connecting pipe; 8. a step structure; 81. a first annular step; 82. a second annular step.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

The present embodiment is specifically described below with reference to the accompanying drawings:

the embodiment provides a conjoined short-distance transverse expansion joint as shown in fig. 1-6, which comprises two sections of corrugated pipes 1, a middle straight pipe 2 connected between the two sections of corrugated pipes 1, two connecting flanges 3 respectively arranged at one ends of the two sections of corrugated pipes 1, a pull rod 4 arranged between the two connecting flanges 3, two spherical nuts 5 respectively fastened and pressed on the two connecting flanges 3 at two ends of the pull rod 4 in threaded connection, the middle straight pipe 2 and the two sections of corrugated pipes 1 are integrally formed, a multi-ring convex structure 21 is formed on the circumferential side wall of the middle straight pipe 2 at intervals, the cross section of the convex structure 21 is in a circular arc shape, and the height h1 of a corrugated protrusion 10 of the corrugated pipe 1 is larger than the height h3 of the convex structure 21.

In the above embodiment, the hydraulic expansion mode is adopted to realize the integral structural molding according to the middle straight pipe 2 and the two sections of corrugated pipes 1, which not only can meet the purpose of transverse displacement compensation, but also reduces the product welding bead, is convenient to process, reduces the welding leakage risk, and simultaneously reduces the cost, in addition, the multi-ring bulge structures 21 with the arc-shaped cross sections are molded on the circumferential side wall of the middle straight pipe 2, the bulge structures 21 are distributed at intervals along the length direction of the middle straight pipe 2, the structural design increases the structural strength and toughness of the middle straight pipe 2, is favorable for reducing concentrated stress, effectively overcomes the problem that the middle straight pipe 2 is distorted or even broken due to overlarge stress, greatly improves the load bearing capacity of the middle straight pipe between the two sections of corrugated pipes, has strong torsion resistance, has good structural stability, has long service life, and is relatively simple in structure, and can be better suitable for L-shaped and Z-shaped pipe sections with large displacement amounts by the angle deflection absorption pipe systems of the two sections of the technical scheme.

The specific structure of the bellows is described in detail below in conjunction with fig. 1-3:

the corrugated bulge 10 of the corrugated tube 1 has a wide bottom and a narrow top, specifically, the corrugated bulge 10 comprises a lower body 11 and an upper V-shaped body 12 which are connected up and down, the top end of the upper V-shaped body 12 is an arc end, the bottom end width of the upper V-shaped body 12 is equal to the width of the lower body 11, wherein the height h1 of the corrugated bulge 10 is twice as high as the height h2 of the lower body 11, the corrugated bulge 10 has the advantages that the corrugated quantity of the corrugated tube 1 can be made to be more, the wave height is also made to be higher, the corrugated tube has better flexibility, the transverse compensation quantity of the corrugated tube is increased, although the wave distance is reduced while the corrugated quantity is increased, the top position interval among a plurality of the corrugations is increased because the top width of the corrugated bulge is gradually reduced from bottom to top, the situation of mutual collision among the corrugations can be effectively avoided after the design, interference influence is eliminated, and the purpose of obtaining a larger transverse compensation quantity under the same distance is realized.

Further preferably, as shown in fig. 3, the height h3 of the protruding structure 21 is one fourth of the height h1 of the corrugated protrusion 10, the bottom width distance of the protruding structure 21 is multiple times of the wave pitch of the corrugated tube 1, and the design of the small arc protrusion can increase the structural strength and flexibility of the middle section and improve the service life, so that the length of the middle straight tube can be made longer on the basis of the design, and the size of compensating transverse displacement can be increased.

In this embodiment, middle straight tube 2 and two sections bellows 1 are made by the stainless steel pipe embryo of at least one deck through hydraulic pressure mode an organic whole that expands, and integral type structural stability is good to avoid the welding bead and reveal the risk because of the welding produces, processing is convenient, and the disjunctor short distance transverse expansion festival that this embodiment provided is particularly useful for the mounted position short, but requires the occasion that transverse displacement is big, can effectively satisfy the operating mode requirement.

The connecting short-distance transverse expansion joint is shown in combination with fig. 1-2, the connecting short-distance transverse expansion joint further comprises guide cylinders 6 which are arranged inside the two corrugated pipes 1 and the middle straight pipe 2 in an extending mode, the guide cylinders 6 are formed by sequentially buckling steel belts with multiple sections in an S-shaped structure, one end, far away from the middle straight pipe 2, of the corrugated pipe 1 is formed with a straight-edge connecting pipe 7, the connecting flange 3 is welded and sleeved on the straight-edge connecting pipe 7, and the straight-edge connecting pipe 7 of the corrugated pipe 1 is designed to be as short as possible under the premise that flange installation is not affected, so that the corrugated pipe and the middle straight pipe can be designed to be longer conveniently. According to the structure, the guide cylinder 6 adopts the S-shaped inner buckle winding steel belt with the deformable design, the S-shaped inner buckle winding steel belt is a non-sealing piece, and cannot be damaged due to the fact that the pipe cannot be pressurized when the pipe is pressurized, the guide cylinder 6 is designed to keep medium to flow stably in the corrugated pipe and reduce friction between the inner wall of the corrugated pipe 1 and the medium, and when the expansion joint compensates for transverse displacement, the guide cylinder has the capability of absorbing the transverse displacement, and can be well attached to the pipe along the transverse displacement.

In order to realize the installation and fixation between the corrugated pipe 1 and the guide cylinder 6 and the connecting flange 3, as shown in fig. 4-5, the connecting flange 3 comprises an inner diameter hole 31 and a plurality of flange holes 32 which are arranged around the inner diameter hole 31 at intervals, a step structure 8 is arranged in the inner diameter hole 31, the step structure 8 comprises a first annular step 81 for welding the straight edge connecting pipe 7 and a second annular step 82 for welding the guide cylinder 6, the inner diameter hole 31 of the connecting flange 3 adopts a step structure layered design, the diameter of the first annular step 81 is larger than that of the second annular step 82, the straight edge connecting pipe 7 of the corrugated pipe 1 is welded at the position of the first annular step, and one end of the guide cylinder 6 is welded at the position of the first annular step, so that two welding beads are staggered and distributed, the two welding beads are prevented from being influenced by each other, the welding bead strength is ensured, and the structural stability is good.

As shown in fig. 1 and fig. 4-5, the connecting flange 3 further includes a pair of protrusions 33 symmetrically disposed about the center of the inner diameter hole 31, a pair of tie rod holes 34 adapted to be penetrated by the tie rod 4 are disposed on the pair of protrusions 33, a line connecting the pair of tie rod holes 34 passes through the center of the inner diameter hole 31, and the number of tie rod holes 34 is designed to be identical to the number of tie rods 4. The flange hole 32 and the pull rod hole 34 are arranged on the same flange surface, a round flange structure is not adopted, the pull rod hole 34 and the flange hole 32 are distributed on the same flange surface in a staggered and centered mode, and the distance between the two is as small as possible on the premise that installation is not affected, so that the outer circle of the flange is reduced, and the material cost is reduced. As a specific structural arrangement, the port of the pull rod hole 34 is provided with a conical surface structure 35, one end of the spherical nut 5 is a plane end, the other end of the spherical nut is a spherical end matched and abutted against the conical surface structure 35, when the pull rod 4 is matched and installed with a connecting pulling method, the spherical end of the spherical nut 5 is just abutted against the conical surface structure 35 of the port of the pull rod hole 34, the spherical nut 5 and the conical surface structure 35 are in multidirectional sliding fit, so that the effect of transversely deflecting the pull rod by matching two corrugated pipes is achieved, and therefore, the transverse short-distance expansion joint achieves transverse deflection of the pull rod by matching the spherical nut with the conical surface structure in a mode that the two corrugated pipes 1 are deformed at an angle, and the middle straight section is not deformed, so that the requirement of transverse displacement compensation of a pipeline is met.

The working mode of the conjoined short-distance transverse expansion joint of the embodiment is shown in fig. 6, the conjoined short-distance transverse expansion joint is arranged at the vertical corner position of two pipelines, the two pipelines may be vertically centered during installation, when the upper pipeline and the lower pipeline need to move left and right, the centers of the two pipelines have transverse displacement deviation L, and if the fully rigid pipeline is adopted, larger stress concentration exists, and danger may be caused. The conjoined short-distance transverse expansion joint meets the requirement of transverse displacement compensation of an upper pipeline and a lower pipeline in a mode that the corrugated sections at two ends are deformed at an angle and the straight section in the middle is not deformed. The conjoined short-distance transverse expansion joint product with the structural design has the advantages of few parts, simple structure, simple assembly and welding process and capability of greatly reducing the cost.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. The utility model provides a disjunctor short distance transverse expansion festival, includes two sections bellows (1) and connects intermediate straight tube (2) between two sections bellows (1) to and set up two flange (3) on two sections bellows (1) one end respectively, be provided with pull rod (4) between two flange (3), the both ends threaded connection of pull rod (4) has two spherical nuts (5) of fastening respectively to support and pressing on flange (3), its characterized in that: the corrugated pipe is characterized in that the middle straight pipe (2) and the two sections of corrugated pipes (1) are integrally formed, multiple rings of convex structures (21) are formed on the circumferential side wall of the middle straight pipe (2) at intervals, the cross section of each convex structure (21) is in an arc shape, and the height h1 of each corrugated protrusion (10) of each corrugated pipe (1) is larger than the height h3 of each convex structure (21).

2. The conjoined short distance transverse expansion joint according to claim 1, wherein: the corrugated bulge of the corrugated pipe (1) is wide at the bottom and narrow at the top.

3. The conjoined short distance transverse expansion joint according to claim 2, wherein: the corrugated bulge (10) comprises a lower body (11) and an upper V-shaped body (12) which are connected up and down, the top end of the upper V-shaped body (12) is an arc end, and the width of the bottom end of the upper V-shaped body (12) is equal to the width of the lower body (11).

4. A conjoined short distance transverse expansion joint according to claim 3, wherein: the height h1 of the corrugation lobes (10) is twice the height h2 of the lower body (11).

5. The conjoined short distance transverse expansion joint according to claim 4, wherein: the height h3 of the raised structures (21) is one fourth of the height h1 of the corrugated protrusions (10).

6. The conjoined short distance lateral expansion joint according to any one of claims 1-5, wherein: the middle straight pipe (2) and the two sections of corrugated pipes (1) are integrally manufactured by at least one layer of stainless steel pipe blank in a hydraulic expansion mode.

7. The conjoined short distance transverse expansion joint according to claim 6, wherein: the corrugated pipe is characterized by further comprising guide cylinders (6) which are arranged inside the two corrugated pipes (1) and the middle straight pipe (2) in an extending mode, wherein the guide cylinders (6) are formed by sequentially buckling steel belts with multiple sections in an S-shaped structure, one end, far away from the middle straight pipe (2), of the corrugated pipe (1) is provided with a straight-edge connecting pipe (7) in a forming mode, and the connecting flange (3) is welded and sleeved on the straight-edge connecting pipe (7).

8. The conjoined short distance transverse expansion joint according to claim 7, wherein: the connecting flange (3) comprises an inner diameter hole (31) and a plurality of flange holes (32) which are arranged at intervals around the inner diameter hole (31), wherein a step structure (8) is arranged in the inner diameter hole (31), and the step structure (8) comprises a first annular step (81) for welding the straight-edge connecting pipe (7) and a second annular step (82) for welding the guide cylinder (6).

9. The conjoined short distance transverse expansion joint according to claim 8, wherein: the connecting flange (3) further comprises at least one pair of protruding parts (33) symmetrically arranged around the center of the inner diameter hole (31), a pair of pull rod holes (34) which are suitable for the pull rod (4) to pass through are arranged on the protruding parts (33), and a connecting line of the pair of pull rod holes (34) passes through the center of the inner diameter hole (31) and is staggered with the flange hole (32).

10. The conjoined short distance transverse expansion joint according to claim 9, wherein: a conical surface structure (35) is arranged at the port of the pull rod hole (34), one end of the spherical nut (5) is a plane end, and the other end of the spherical nut is a spherical end matched and abutted on the conical surface structure (35).