CN210291113U - Corrugated pipe compensator and engine exhaust pipe and working machine comprising same - Google Patents

Abstract

A corrugated pipe compensator, an engine exhaust pipe comprising the corrugated pipe compensator and a working machine comprising the corrugated pipe compensator are provided. The bellow compensator is adapted to be connected at both ends to two adjacent pipes, respectively, the bellow compensator comprising a bellow (1), the bellow (1) comprising a tubular body (11) being at least partly corrugated and two annular flanges (12), wherein the two annular flanges (12) extend outwardly from both ends of the body (11), respectively, in a radial direction of the bellow; wherein at least one of the flanges (12) is formed at its free end with a flange (121) bent towards the axial outside of the bellows. The arrangement of the flanging (121) enhances the sealing performance of the connection between the corrugated pipe compensator and the adjacent pipeline, and prevents the leakage of fluid in the pipeline at the connection position. A boss (23) may also be provided on the flange of the bellows compensator on its side adjacent the flange (12) to improve sealing.

Description

Corrugated pipe compensator and engine exhaust pipe and working machine comprising same

Technical Field

The utility model relates to a bellows compensator for pipeline especially relates to a bellows compensator for among the engine exhaust pipe.

Background

In fluid conduit systems, such as thermal conduits containing high temperature fluids (including liquids or gases), deformation of the conduit due to expansion and contraction of the conduit often occurs, which deformation results in axial, transverse or torsional displacement of portions of the conduit, causing stresses in the conduit and even misalignment or cracking of the conduit, resulting in fluid leakage.

In order to overcome the above problems, a bellows compensator is often provided, both ends of which are connected to the two pipe portions, respectively, and which uses the effective telescopic deformation of the bellows of its working body to absorb the dimensional changes of the pipe due to thermal expansion and contraction, etc., or to compensate the axial, lateral and torsional displacements of the pipe, to reduce the stress experienced by the pipe, or to absorb the vibration of the pipe and to reduce noise.

The above-described bellows compensators are typically flanged to the pipe flanges of adjacent pipe sections, however, sealing problems are easily created at this connection, resulting in fluid leakage. For example, in an exhaust pipe of an engine using a bellows compensator, a gas leakage may occur.

The present invention is directed to solving the above problems and/or other problems in the prior art.

SUMMERY OF THE UTILITY MODEL

The present invention provides a bellow compensator adapted to be connected at both ends to adjacent pipes, respectively, and comprising a bellow, wherein the bellow comprises an at least partially bellow shaped main body and two flanges extending outwards in a radial direction of the bellow from both ends of the main body, respectively; wherein at least one of the flanges is formed at a free end thereof with a flange bent toward an axially outer side of the bellows.

The utility model also provides an engine exhaust pipe, it includes as above corrugated expansion joint ware and corrugated expansion joint ware's both ends respectively rather than two of connecting adjacent pipeline.

The utility model also provides an operation machine, it includes as above engine exhaust pipe.

The beneficial effects of the utility model reside in that, at least, form the court through the free end at the flange of bellows the turn-ups of buckling in the axial outside of bellows, this turn-ups plays the effect similar to spring shim between the flange of bellows compensator and adjacent pipeline, improves the sealed effect between bellows compensator and the adjacent pipeline flange from this. Furthermore, the thickness of the connecting contact surface is increased due to the arrangement of the boss, and the sealing effect is enhanced. And the sealing performance is further improved by arranging the lug boss and the flanging at the same time.

Drawings

Fig. 1 shows a schematic perspective view of a bellow compensator according to an exemplary embodiment of the present invention;

FIG. 2 illustrates a cross-sectional schematic view of the bellow compensator shown in FIG. 1; and

fig. 3 shows a schematic perspective view of a bellows compensator according to an exemplary embodiment of the present invention applied to a pipe.

Detailed Description

Fig. 1 schematically shows a bellows compensator. In the description herein, an engine exhaust pipe is used as an example of an application of the bellows compensator, and since the engine exhaust pipe is subjected to impact of high-temperature exhaust gas, breakage of the pipe is easily generated due to thermal expansion and contraction deformation of the pipe, and therefore the bellows compensator is often provided to absorb the deformation and to absorb vibration of the engine exhaust pipe when the vehicle or the work machine is running. However, it will be understood by those skilled in the art that the bellows compensator described herein can be applied not only to engine exhaust pipes, but also to other heat pipes, such as chemical engineering, to absorb the deformation and stress caused by thermal expansion and contraction of the pipe. Further, the bellows compensator described in the present invention is not limited to be applied to thermal pipelines, but also can be applied to ordinary fluid pipeline systems, for example, to absorb thermal expansion and contraction deformation of pipelines caused by environmental temperature changes or the like or to absorb vibration of pipeline systems caused by some reasons.

As shown in fig. 3, the bellows compensator is located between two adjacent pipes and is connected to two flanges 4 of the adjacent pipes, respectively, so as to absorb deformation, displacement or vibration of the adjacent pipes and thus the pipe system through the bellows.

As shown in fig. 1-3, the present invention provides a bellow compensator adapted to be connected at both ends to adjacent pipes, respectively, said bellow compensator comprising a bellow 1, said bellow 1 comprising a tubular body 11 at least partly corrugated and two annular flanges 12, wherein the two flanges 12 extend outwardly and circumferentially from both ends of said body 11 in a radial direction of said bellow, respectively; at least one of the flanges 12 is formed at its free end with a flange 121 bent towards the axial outside of the bellows.

In the above example, by forming the burring 121 bent toward the axial outside of the bellows at the free end of the flange 12, the burring 121 functions like a spring washer by being pressed between the flange 12 and the flange 4 of the adjacent pipe when the bellows compensator is connected to the flange 4 of the adjacent pipe, thereby improving the sealing effect between the bellows compensator and the flange 4 of the adjacent pipe. As an example, the material of the bellows may be metal. Preferably, in the bellows, at least two annular flanges 12 are made of metal. The flange 12 made of metal engages the flange 4 of the adjacent pipe in a sealing surface. As an example, the body 11 of the bellows may also be made of metal. The bead 121, which may also be referred to as a raised portion, is formed by performing a process such as stamping, crimping, or the like on the end of the metal flange 12.

Further, for the corrugated pipe without the flange 121, since the joint surface of the flange and the flange 4 of the adjacent pipe is used as a sealing joint surface, in order to achieve good joint and sealing effects, the requirement on the quality of the outer surface of the flange is high, that is, the requirement on the flatness and the roughness of the outer surface of the flange is high, so that the complexity and the difficulty of the machining process are increased. And in the scheme of the utility model, guarantee sealed effect through setting up of turn-ups 121 for can reduce the requirement to the composition surface of the flange of flange and adjacent pipeline, reduce the processing degree of difficulty and processing cost.

As shown in fig. 1 to 3, the bellow compensator may further comprise a first flange 21 and a second flange 22 respectively disposed at both ends of the body 11 and adapted to be connected to the flanges 4 of the adjacent pipes and to hold the flanges 12 between the first and second flanges 21 and 22 and the flanges 4 of the pipes, respectively; wherein at least one of the first flange 21 and the second flange 22 is provided with a circumferentially extending annular boss 23 at a side thereof adjacent to said flange 12 for retaining the respective flange 12 between said boss 23 and the flange 4 of the respective pipe.

Since the material of the flange 12 of the corrugated pipe is generally thin, for example, 0.6mm, when the first flange 21 and the second flange 22 are connected with the flange 4 of the adjacent pipe, the sealing of the contact surface between the first flange 21 and the second flange 22 and the flange 4 of the adjacent pipe is difficult to ensure due to the small thickness of the flange, and the thickness of the contact surface is increased by the arrangement of the boss 23, so that the sealing effect is enhanced.

It will be appreciated by those skilled in the art that at least one of the first and second flanges 21, 22 is provided with a boss 23, i.e. both may be provided with a boss 23, or only one of them may be provided with a boss.

In order to ensure the sealing effect, the thickness of the boss 23, i.e. the protrusion height, is selected, and a large number of experiments have shown that the best sealing effect is obtained when the thickness h of the boss in the axial direction of the bellows is 0.5-1.5 mm. More preferably, the thickness may be 1.0 mm.

In particular, in the present invention, by combining the flange 121 at the flange 12 of the corrugated pipe 1 with the boss 23 at the first flange 21 and/or the second flange 22, experiments show that the sealing performance reaches a higher level than the structure in which the boss 23 is provided alone or the flange 121 is provided alone.

Because of the corrugated shape of the bellows body, in which the flow of fluid is influenced, a guide shell 3 may be provided in the bellows compensator, which guide shell 3 is arranged substantially coaxially with the bellows, to guide the flow of fluid therein; wherein the guide shell 3 comprises a guide shell body 31 located inside the bellows and a guide shell flange 32 extending outwardly and circumferentially from one end of the guide shell body 31 in a radial direction of the bellows, the guide shell flange 32 being located axially outwardly of the flange 12 adjacent to the first flange 1 in an axial direction of the bellows; wherein the boss 23 is formed only on the second flange 22.

In the above solution, since the guide cylinder flange 32 is located axially outside the flange 12 adjacent to the first flange 1, when connecting with the flange 4 of the adjacent pipe, the guide cylinder flange 32 and the flange 12 of the bellows are both located between the first flange 21 and the flange 4 of the adjacent pipe, so that the thickness of the contact surface for achieving sealing is large, and thus it is not necessary to provide the boss 23 on the first flange 21. However, it will be appreciated by those skilled in the art that in the presence of the guide shell, a boss 23 may still be provided on the first flange 1 to achieve a sealing effect.

According to an aspect of the present invention, there is also provided an engine exhaust pipe, comprising the bellows compensator according to the above example and two adjacent pipes connected to the bellows compensator at both ends thereof, respectively. Thereby improving the sealing performance at the bellows compensator of the engine exhaust pipe.

According to an aspect of the present invention, there is also provided a working machine including the engine exhaust pipe as described above. The work machine thus has improved engine performance.

Industrial applicability

The bellows compensator according to the invention can be used in particular in an engine exhaust pipe of a working machine. As shown in fig. 3, the bellows compensator is installed between two pipe segment portions (also referred to as adjacent pipes, respectively, in the description herein) of, for example, an engine exhaust pipe.

In particular, the bellow compensator is installed into the pipe system at both ends thereof by the connection between the first and second flanges 21 and 22, respectively, and the flanges 4 of the adjacent pipes. Wherein one flange 12 of bellows 1 is located between second flange 22 and corresponding flange 4, and the other flange 12 of bellows 1 and guide shell flange 32 are located between first flange 21 and corresponding flange 4. Wherein, between the second flange 22 and the flange 4, due to the existence of the boss 23 and/or the existence of the flange 121, the connection between the corrugated pipe compensator and the flange of the adjacent pipeline is tighter, and the sealing performance of the connection position is improved.

When the engine works, high-temperature exhaust gas flows in the exhaust pipeline and passes through the corrugated pipe compensator under the guidance of the guide cylinder 3. Due to its good sealing properties, exhaust gases cannot leak at the connection of the bellows compensator.

It will be appreciated by those skilled in the art that although the engine exhaust pipe is used herein as an example, the bellows compensator according to the present invention may be applied to various pipe applications and provides a good fluid seal as described above.

It will be apparent to those skilled in the art that various modifications and variations can be made in the above disclosed embodiments without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples disclosed herein be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.

Claims (9)

1. A bellow compensator adapted to be connected at both ends to two adjacent pipes, respectively, characterized in that it comprises:

a corrugated tube (1), the corrugated tube (1) comprising:

a tubular body (11) at least partially corrugated; and

two annular flanges (12) extending outward in a radial direction of the bellows from both ends of the main body (11), respectively;

wherein at least one of the flanges (12) is formed at its free end with a flange (121) bent towards the axial outside of the bellows.

2. The bellow compensator of claim 1, further comprising:

a first flange (21) and a second flange (22) respectively provided at both ends of the main body (11) and adapted to be connected to respective flanges (4) of the adjacent two pipes to hold the two flanges (12) between the first flange (21) and the second flange (22) and the respective flanges (4) of the two pipes, respectively;

wherein at least one of the first flange (21) and the second flange (22) is provided with an annular boss (23) on a side thereof adjacent the respective flange (12) to retain the respective flange between the boss (23) and the flange of the respective pipe.

3. Bellows compensator according to claim 2, wherein the boss (23) has a thickness (h) in the axial direction of the bellows of 0.5-1.5 mm.

4. The bellow compensator according to claim 3, wherein the thickness is 1.0 mm.

5. The bellow compensator of claim 1, wherein at least the two annular flanges of the bellow are made of metal.

6. Bellows compensator according to claim 5, characterized in that the body (11) of the bellows is also made of metal.

7. The bellow compensator according to any of claims 2-4, further comprising:

a guide shell (3) disposed substantially coaxially with the bellows, wherein the guide shell comprises:

a guide shell body (31) located within the bellows; and

an annular guide shell flange (32) extending outwardly from one end of the guide shell body (31) in a radial direction of the bellows, the guide shell flange (32) being located outside the flange (12) adjacent to the first flange (21) in an axial direction of the bellows;

wherein the boss (23) is formed only on the second flange (22).

8. An engine exhaust pipe comprising:

the bellow compensator according to any of claims 1-7; and

and the two adjacent pipelines are respectively connected with the two ends of the corrugated pipe compensator.

9. A work machine comprising the engine exhaust pipe of claim 8.

Images