CN213629416U

CN213629416U - Corrugated pipe device and pipeline system

Info

Publication number: CN213629416U
Application number: CN202022117131.1U
Authority: CN
Inventors: 代超
Original assignee: Shenzhen Crystal Energy Tech Co ltd
Current assignee: Shenzhen Jiejing Technology Co ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-07-06
Anticipated expiration: 2030-09-23

Abstract

The utility model relates to a bellows application provides a bellows device and pipe-line system. The bellows device includes first stiff end, second stiff end and two above sliding assembly. The first fixed end is connected with one end of the corrugated pipe, the second fixed end is connected with the other end of the corrugated pipe, the sliding assembly comprises a first sliding piece and a second sliding piece, the second sliding piece is connected with the first sliding piece in a sliding mode, the first sliding piece is fixed to the first fixed end, and the second sliding piece is fixed to the second fixed end. The bellows device of the utility model fixes the first fixed end and the second fixed end through the sliding component, thereby limiting the radial deviation of the two ends of the bellows, and preventing the bellows from generating tangential deformation to cause the damage of the tube body; because the first sliding part can stretch or compress along with the stretching or compressing of the corrugated pipe in the axial direction, the compensation effect of the structure of the corrugated pipe on the expansion caused by heat and the contraction caused by cold of the pipeline is ensured.

Description

Corrugated pipe device and pipeline system

Technical Field

The utility model belongs to the technical field of the bellows application and specifically relates to a bellows device and pipe-line system are related to.

Background

At present, the corrugated pipe is mainly used for conveying various fluids, and is widely applied to industries such as petrifaction, aerospace, chemical engineering, electric power, metallurgy and the like due to the effects of compensating thermal deformation of pipelines, absorbing shock, absorbing sedimentation deformation of pipelines and the like. In actual industrial production or operation, the fluid in the corrugated pipe is in a flow state mainly in a turbulent flow state, and the fluid in the turbulent flow state can impact the inner wall of the corrugated pipe to cause vibration. These vibrations cause the bellows body to be displaced in the radial direction, and damage the bellows structure, and in the related art, in order to reduce the radial damage caused by turbulent vibrations, it is common to fix both ends of the bellows body with flanges and bolts. The fixed action of flange and bolt can prevent that relative skew takes place for the bellows both ends in footpath, but the bellows can't be flexible along the axial this moment, has lost the compensation effect to pipeline expend with heat and contract with cold.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a bellows device and pipe-line system through having set up first stiff end, second stiff end and sliding assembly, can prevent that the radial skew of bellows from taking place to destroy, ensures the compensation of bellows structure to pipeline expend with heat and contract with cold.

According to the utility model discloses a bellows device of first aspect embodiment includes:

a corrugated tube is arranged on the upper surface of the corrugated tube,

the first fixed end is connected with one end of the corrugated pipe;

the second fixed end is connected with the other end of the corrugated pipe;

the corrugated pipe comprises more than two sliding assemblies, each sliding assembly comprises a first sliding piece and a second sliding piece, the second sliding pieces are connected with the first sliding pieces in a sliding mode, the first sliding pieces are fixed on the first fixed ends, the second sliding pieces are fixed on the second fixed ends, and at least two sliding assemblies are distributed in a central symmetry mode relative to the corrugated pipe.

The utility model discloses bellows device has following beneficial effect at least: the first fixed end and the second fixed end are fixed through the sliding assembly, so that the radial deviation of the two ends of the corrugated pipe is limited, and the pipe body is prevented from being damaged due to tangential deformation of the corrugated pipe; because the first sliding part can stretch or compress along with the stretching or compressing of the corrugated pipe in the axial direction, the compensation effect of the structure of the corrugated pipe on the expansion caused by heat and the contraction caused by cold of the pipeline is ensured.

In some embodiments of the present invention, the second sliding member is provided with a sliding groove extending along the axial expansion direction of the bellows, and the first sliding member is slidably connected to the sliding groove and can slide along the sliding groove.

In some embodiments of the present invention, the second sliding member is provided with a hollow portion extending along an axial expansion direction of the bellows, and the second sliding member is sleeved outside the first sliding member.

In some embodiments of the present invention, the movable distance of the first sliding member relative to the second sliding member is not less than the maximum expansion amount of the bellows.

In some embodiments of the present invention, the first fixing end is provided with a first end bolt hole; the second fixing end is provided with second end bolt holes at positions corresponding to the first end bolt holes, the number of the first end bolt holes is the same as that of the sliding assemblies, the first sliding piece is provided with a first connecting end, the first connecting end is provided with a first external thread, the first connecting end is fixed on the first fixing end through two positioning nuts, the second sliding piece is provided with a second connecting end, the second connecting end is provided with a second external thread, and the second connecting end is fixed on the second fixing end through two positioning nuts.

In some embodiments of the present invention, the first fixed end is a flange, and the second fixed end is a flange.

In some embodiments of the invention, the first slider has a cross-sectional dimension that is less than the first end bolt hole inner diameter dimension; or the cross section size of the second sliding piece is smaller than the inner diameter size of the second end bolt hole.

In some embodiments of the present invention, the at least one first sliding member is provided with a scale.

The utility model discloses an in some embodiments, the scale that first slider set up includes zero scale mark, positive scale and negative scale, positive scale with the negative scale distributes zero scale mark both sides, the maximum reading of positive scale is no less than the big design elongation of bellows, the maximum reading of negative scale does the maximum compression capacity of bellows.

On the other hand, the utility model provides a pipe system, include the utility model discloses the bellows device that the first aspect provided.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a bellows device in an embodiment of the present invention;

FIG. 2 is a top view of the bellows device of FIG. 1;

FIG. 3 is a schematic view of a sliding assembly of the bellows device of FIG. 1.

Reference numerals:

the first fixing end 210, the first end bolt hole 211, the second fixing end 220, the second end bolt hole 221, the sliding assembly 300, the first sliding member 310, the first connecting end 311, the second sliding member 320, the second connecting end 321, the hollow portion 322, the first positioning nut 331, the second positioning nut 332, the third positioning nut 333, and the fourth positioning nut 334 are disposed on the corrugated pipe 100.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated, for example, up, down, left, right, etc., referred to the orientation description is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

If the term "plurality" is used, two or more, if the term "greater than", "less than" or "more than" is used, the term should be understood as excluding the number, and if the term "greater than", "less than" or "more than" is used, the term should be understood as including the number. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, an embodiment of the present invention provides a bellows device, including: the corrugated pipe 100, the first fixing end 210, the second fixing end 220 and more than two sliding assemblies 300. The first fixing end 210 is connected to one end of the orifice of the corrugated tube 100, and the second fixing end 220 is connected to the other end of the corrugated tube 100.

The first fixing end 210 and the second fixing end 220 may be connected to the two ends of the corrugated pipe 100 by welding, gluing, screwing, or loose-fitting. Specifically, the first fixing end 210 and the second fixing end 220 are both provided with through holes, and the inner wall of the through hole of the first fixing end 210 and the inner wall of the through hole of the second fixing end 220 are respectively connected with the outer walls of the pipe orifices at the two ends of the corrugated pipe 100.

The shape of the first fixing end 210 and the second fixing end 220 may be regular cylinders, prisms, cuboids, or other irregular shapes. The shape of the first fixing end 210 and the shape of the second fixing end 220 may be the same or different. The sliding assembly 300 includes a first slider 310 and a second slider 320, the second slider 320 being slidably connected to the first slider 310. The shape of the second slider 320 and the shape of the first slider 310 may be a cylinder, a cuboid, a prism, etc. The second sliding member 320 and the first sliding member 310 may be slidably connected by a sliding groove formed on the second sliding member 320, and the first sliding member 310 slides along the guide rail through the sliding groove; the first sliding member 310 may be disposed inside the second sliding member 320, and the first sliding member 310 may slide along an inner wall of the second sliding member 320.

The sliding direction of the first sliding member 310 is parallel to the axial direction of the corrugated tube 100, and the material of the second sliding member 320 and the material of the first sliding member 310 are both rigid materials, so that the second sliding member 320 and the first sliding member 310 are always parallel to the axial direction of the corrugated tube 100 and do not bend and deform, at this time, the sliding assembly 300 does not deform along the radial direction of the corrugated tube 100, and the two ends of the corrugated tube 100 fixed on the first fixing end 210 and the second fixing end 220 cannot deviate, thereby reducing the radial destructive effect caused by turbulent vibration. The rigid material is a material having high rigidity and hardly deformed.

The first sliding member 310 is fixed to the first fixing end 210, the second sliding member 320 is fixed to the second fixing end 220, and the fixing manner of the first sliding member 310 to the first fixing end 210 includes, but is not limited to, welding, riveting, screwing, and the like. The second sliding member 320 is fixed to the second fixing end 220 by welding, riveting, screwing, or the like. When the temperature of the fluid in the pipeline rises, the bellows 100 will be stretched in the axial direction due to heat, the position of the first fixing end 210 will change along with the stretching of the bellows 100, at this time, the first sliding member 310 slides along the stretching direction of one end of the bellows 100 along with the first fixing end 210, and the second sliding member 320 slides along the stretching direction of the other end of the bellows 100 along with the second fixing end 220.

Of the two or more sliding assemblies 300, at least two sliding assemblies 300 are symmetrically distributed about the center of the bellows 100. When two or more sliding members 300 are symmetrical with respect to the center of the corrugated pipe 100, the sliding members 300 fix the corrugated pipe 100 at two ends in a complete radial direction, so that the first fixing end 210 and the second fixing end 220 are restricted from being shifted in the radial direction. When there are two sliding assemblies 300 that are symmetric about the center of the bellows 100, there is radial fixation between the two ends of the bellows 100, and if more than two sliding assemblies are provided, the remaining sliding assemblies 300 may or may not be symmetrically disposed about the center of the bellows 100. Wherein the more sliding assemblies 300 that are centrosymmetric about the bellows 100, the greater the radial fixation of the entire bellows arrangement.

When the temperature of the fluid in the pipeline decreases, the bellows 100 is compressed in the axial direction due to cooling, the position of the first fixing end 210 changes along with the compression of the bellows 100, and at this time, the first sliding member 310 slides along the compression direction of one end of the bellows 100 along with the first fixing end 210, and the second sliding member 320 slides along the compression direction of the other end of the bellows 100 along with the second fixing end 220. Therefore, when the temperature changes, the first sliding member 310 changes in position along with the position change of the first fixed end 210, and the second sliding member changes in position along with the position change of the second fixed end 220, so as to effectively compensate for thermal expansion and contraction of the corrugated tube 100.

In the bellows 100 device of the embodiment of the present invention, the bellows 100 device is provided with the sliding assembly 300, the sliding assembly 300 limits the bellows 100 between the first fixing end 210 and the second fixing end 220, the sliding assembly 300 does not bend and deform, the first fixing end 210 and the second fixing end 220 generate a radial fixing effect on the bellows 100, and radial damage caused by fluid impact vibration in the pipe is reduced; because the first sliding member 310 can change its position with the position of the first fixing end 210, and the second sliding member 320 can change its position with the position of the second fixing end 220, and the position changes of the first fixing end 210 and the second fixing end 220 are generated based on the stretching or compressing of the corrugated tube 100 in the axial direction, so that the radial fixing of the corrugated tube 100 can be realized, a stretching space is provided for the corrugated tube 100, and the compensation effect of the expansion caused by heat and the contraction caused by cold of the corrugated tube 100 is ensured.

In some embodiments of the present invention, the second sliding member 320 is provided with a sliding groove (not shown) extending along the axial expansion direction of the corrugated pipe 100, and the first sliding member 310 is slidably connected to the sliding groove and can slide along the sliding groove. The sliding groove is parallel to the axial expansion direction of the corrugated tube 100, and the axial expansion of the corrugated tube 100 causes the first fixed end 210 and the second fixed end 220 to move relatively, so as to push the first sliding member 310 and the second sliding member 320 to slide relatively along the sliding groove, thereby realizing the compensation effect of expansion with heat and contraction with cold of the corrugated tube 100.

Referring to fig. 3, in some embodiments of the present invention, a hollow portion 322 is disposed inside the second slider 320, the second slider 320 is sleeved outside the first slider 310, the hollow portion 322 extends along the expansion direction of the bellows 100, the first slider 310 is limited in the hollow portion 322, and the first slider 310 and the hollow portion 322 are in clearance fit, so that the first slider 310 can slide along the hollow portion 322. Compared with the mode of arranging the sliding groove, the hollow part 322 is arranged, only one cavity is required to be arranged inside the second sliding part 320 to serve as a guide rail, the processing is simple, and the first sliding part 310 is inserted into the hollow part 322 and then is in a relatively sealed environment, so that the falling and corrosion are not easy to occur.

In some embodiments of the present invention, the moving distance of the first slider 310 relative to the second slider 320 is not less than the maximum amount of extension and retraction. The moving distance of the first sliding member 310 relative to the second sliding member 320 is the maximum compensation amount of the bellows 100 device for thermal expansion and contraction of the bellows 100 provided by the present invention. The maximum expansion amount of the bellows 100 is the sum of the maximum elastic deformation of the bellows 100 that can be stretched along the axial direction and the maximum elastic deformation of the bellows 100 that can be compressed along the axial direction due to the limitation of the parameters such as the material and the structure of the bellows 100, and when the moving distance of the first sliding member 310 on the second sliding member 320 is the maximum expansion amount, the moving distance of the first sliding member 310 on the bellows 100 along the axial direction is the maximum expansion amount of the bellows 100, and at this time, the whole bellows 100 device can satisfy the compensation of thermal expansion and cold contraction within the elastic deformation range of the bellows 100.

When the moving distance of the first slider 310 on the second slider 320 is greater than the maximum telescopic amount, the initial relative positions of the first slider 310 and the second slider 320 can be set at a plurality of positions, a reserved space is provided for the installation of the first slider 310, the installation position of the first slider 310 can be adjusted adaptively according to actual conditions, and the method has wider practicability.

In some other embodiments of the present invention, the moving distance of the first sliding member 310 relative to the second sliding member 320 may be less than the maximum telescopic amount. When the working temperature of the bellows 100 does not change to the maximum elastic deformation of the bellows 100, the moving distance of the first slider 310 on the second slider 320 may be reduced accordingly.

Referring to fig. 1 and 2, in some other embodiments of the present invention, the first fixing end 210 is provided with at least two first-end bolt holes 211; the second fixing end 220 is provided with second end bolt holes 221 at positions corresponding to the first end bolt holes 211, and the number of the first end bolt holes 211 is the same as that of the sliding assemblies 300.

The bolt holes 211 that the first fixed end 210 and the second fixed end 220 set up satisfy: a screw rod is inserted through the first and second end bolt holes 211 and 221 and fixed to the first and second fixing ends 210 and 220 by a screw fastener. The number of the bolt holes 211 of the first fixing end 210 is more than 2, and the larger the number of the first end bolt holes 211 and the second end bolt holes 212 is, the larger the pressure can be borne after the first fixing end 210 and the second fixing end 220 are fixed by bolts.

The first fixing end 210 is provided with the same number of bolt holes 211 as the number of the slide assemblies 300. The more the number of the sliding assemblies 300 is provided, the greater the radial fixing effect of the first fixing end 210 and the second fixing end 220 on the corrugated pipe 100 is, and the greater the internal pressure that the corrugated pipe 100 can bear.

Referring to fig. 1, in some embodiments of the present invention, the first sliding member 310 is provided with a first connection end 311, the first connection end 311 is provided with a first external thread, two positioning nuts fix the first sliding member 310 on the first fixing end 210, the second sliding member 320 is provided with a second connection end 321, the second connection end 321 is provided with a second external thread, and two positioning nuts fix the second sliding member 320 on the second fixing end 220. Specifically, the first positioning nut 331 and the second positioning nut 332 are disposed on two sides of the first fixing end 210, and the first sliding member 310 sequentially passes through the first positioning nut 331, the bolt hole 211 on the first fixing end 210, and the second positioning nut 332. After the first positioning nut 331 and the second positioning nut are tightened, the first sliding member 310 is fixed on the first fixing end 210 and cannot slide by itself, and only when the first fixing end 210 changes its position, the first sliding member 310 slides relative to the second sliding member 320.

The second fixing end 220 is provided at both sides thereof with a third positioning nut 333 and a fourth positioning nut 334, and the second slider 320 sequentially passes through the third positioning nut 333, the bolt hole 211 on the second fixing end 220, and the third positioning nut 333. After the third and

fourth positioning nuts

333 and 334 are tightened, the second slider 320 is fixed to the second fixing end 220. The threaded connection mode facilitates adjustment of the installation position of the corrugated pipe 100, and when the first sliding part 310 or the second sliding part 320 is damaged, parts can be replaced more easily, which is beneficial to later maintenance.

In some other embodiments of the present invention, two positioning nuts are disposed on two sides of the first fixing end 210 and two sides of the first fixing end 210. The double-nut fixing mode has a better anti-loosening effect compared with a single nut, and is suitable for a working environment with larger vibration.

In some other embodiments of the present invention, the first fixing end 210 is a flange, and the second fixing end 220 is a flange. The flange plate has mature production process and design reference, and provides a clear and feasible design scheme for material selection, structural design and the like of the first fixing end 210 and the second fixing end 220. The design of the connection mode between the flange and the bellows, the design of the number of bolt holes of the flange, and the like are well known in the art and are not described herein.

In some embodiments of the present invention, the cross-sectional dimension of the first sliding member 310 is smaller than the inner diameter dimension of the first end bolt hole, and during assembly, the second sliding member 320 can be connected to the second fixing end 220 first, then the first sliding member 310 is passed through the first end bolt hole 211 and connected to the second sliding member 320 in a sliding manner, and then the first sliding member 310 and the first fixing end 320 are connected; similarly, the cross-sectional dimension of the second sliding member 320 may be smaller than the inner diameter dimension of the second end bolt hole 321, and the first sliding member 310 may be connected to the first fixing end 210 first, then the second sliding member 320 passes through the second end bolt hole and is slidably connected to the first sliding member 310, and then the second sliding member 320 is connected to the second fixing end 220. In an implementation, the first sliding member 310 includes a first sliding rod and a first connection end 311 connected to one end of the first sliding rod, and a first external thread may be disposed at the first connection end 311. When the cross-sectional area of the first slide bar of the first slider 310 is smaller than the first-end bolt hole 211, the first slide bar can pass through the first-end bolt hole 211, facilitating assembly or disassembly.

For example, when the cross-sectional area of the first sliding bar is smaller than the first end bolt hole 211, the first sliding member 310 passes through the first end bolt hole 211 and is slidably connected to the guide rail 320, and the first sliding member 310 is fixed to the first fixing end 210 by a positioning nut, so that the assembly is completed; disassembly is performed in reverse order of assembly. Similarly, the second sliding member 320 includes a second sliding rod and a second connecting end 321 connected to one end of the second sliding rod, and the structure arrangement and assembly manner of the second sliding rod and the second connecting end 321 can refer to the structure of the first sliding rod and the first connecting end 311.

In some embodiments of the present invention, at least one first sliding member 310 is provided with a scale. Specifically, the first sliding member 310 is provided with scales, and the scales include a zero scale line, and the scales extend from the zero scale line to two ends along the first sliding member 310. The length distance represented by the graduation value of the scale may be 1mm, or may be other length distances. The measurement range of the scale can be determined according to the maximum design deformation amount of the corrugated pipe 100, and also can be determined according to the deformation amount of the corrugated pipe 100 in a specific working environment. The deformation in a particular working environment refers to: the deformation amount of the corrugated pipe 100 calculated by the specific environmental parameters is given. The scales at the two ends of the zero scale mark can be positive scales; or one end of the scale is positive scale and the other end is negative scale. The zero scale line indicates a position where the bellows 100 is not elastically deformed at a reference temperature, and the zero scale line is different at different reference temperatures.

In the entire bellows 100 device, only one of the slide assemblies 300 may be provided with a scale, or a plurality of the slide assemblies 300 may be provided with a scale. A plurality of slide assemblies 300 are provided that include a scale from which a worker can read from a variety of angles. The scale reflects the compression or stretching state of the corrugated pipe 100, and the worker can quickly judge the state of the corrugated pipe 100 through the reading at the moment, so that the worker can conveniently check and maintain the corrugated pipe.

In some embodiments of the present invention, the scales at both ends of the zero graduation mark are positive scales, wherein one end represents the stretching distance of the bellows 100, and the other end represents the compressing distance of the bellows 100.

In some embodiments of the present invention, the scale provided by the first sliding member 310 includes a zero scale line, a positive scale and a negative scale. Wherein a positive scale indicates a bellows 100 tensile distance and a negative scale indicates a bellows 100 compression distance. The positive and negative scales can quickly determine the expansion and contraction state of the bellows 100. The maximum reading on the positive scale is the maximum amount of stretching of bellows 100 and the maximum reading on the negative scale is the maximum amount of compression of bellows 100. The maximum tensile amount refers to the maximum elastic deformation of the bellows in the axial direction, and the maximum compressive amount refers to the maximum elastic deformation of the bellows in the axial direction. The measurement range of the whole scale is the range of the elastic deformation of the corrugated pipe 100, and the applicable working environment is wide.

Some embodiments of the present invention provide a piping system including the above-mentioned bellows device, and specifically, the bellows device is disposed at a position such as a pipe joint or a heat dissipation position in the piping system. The bellows device is provided with the first fixed end 210, the second fixed end 220 and the sliding assembly 300, so that the bellows 100 is radially fixed, radial damage to turbulent vibration in the bellows can be reduced, and meanwhile, the bellows device has the effect of compensating thermal deformation of a pipeline on the bellows through the sliding assembly 300.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

Claims

1. A bellows apparatus, comprising:

a bellows;

the first fixed end is connected with one end of the corrugated pipe;

the second fixed end is connected with the other end of the corrugated pipe;

2. The bellows arrangement as claimed in claim 1, wherein the second slide is provided with a slide groove extending in an axial telescopic direction of the bellows, the first slide being slidably connected to and slidable along the slide groove.

3. The bellows apparatus as claimed in claim 1, wherein the second slider is provided with a hollow portion extending in an axial expansion and contraction direction of the bellows, and the second slider is fitted outside the first slider.

4. The bellows apparatus of claim 1, wherein the first slide is movable relative to the second slide a distance not less than a maximum amount of expansion and contraction of the bellows.

5. The bellows apparatus of claim 1, wherein the first fixed end is provided with a first end bolt hole having the same number as the number of the sliding assembly; the second fixed end is provided with a second end bolt hole at a position corresponding to the first end bolt hole, the first sliding part is provided with a first connecting end, the first connecting end is provided with a first external thread, the first connecting end is fixed on the first fixed end through a positioning nut, the second sliding part is provided with a second connecting end, the second connecting end is provided with a second external thread, and the second connecting end is fixed on the second fixed end through a positioning nut.

6. The bellows arrangement of claim 5, wherein the first fixed end is a flange and the second fixed end is a flange.

7. The bellows arrangement of claim 5, wherein a cross-sectional dimension of the first slider is less than an inner diameter dimension of the first end bolt hole; or the cross section size of the second sliding piece is smaller than the inner diameter size of the second end bolt hole.

8. Bellows arrangement according to any one of claims 1 to 7, wherein the at least one first slide is provided with a scale.

9. The bellows apparatus of claim 8, wherein the scale comprises a zero-scale line, a positive scale and a negative scale, the positive scale and the negative scale are distributed on both sides of the zero-scale line, a maximum reading of the positive scale is not less than a large design tension of the bellows, and a maximum reading of the negative scale is a maximum compression of the bellows.

10. A pipe system comprising a bellows arrangement as claimed in any one of claims 1 to 9.