KR200190337Y1 - Pipe flexible joint - Google Patents

Abstract

The present invention relates to an expansion joint device for piping, and to ensure that the maximum separation distance and the minimum separation distance between the flanges opposed to each other while joining the bellows pipe and the flange coupled to both ends of the pipe without welding, Its purpose is to reduce the occurrence of product defects by eliminating the transformation of materials due to welding and to improve the workability by seeking simplicity even during installation work.

The present invention for achieving the object described above, the outer end of the flange 20 on the outside of the opening portion through which the front end portion of the bellows pipe 10 having the bent portion bent in the waveform along the entire length through the flange 20 It is bent and fixed to the side and fixed, the buffer member 40 is fitted to the outer peripheral surface of the tie rod 30 is fastened between the flanges 20 to limit the maximum separation distance, the minimum separation distance between the flanges 20 It is characterized in that to ensure.

Description

Expansion Joint for Piping

The present invention relates to a bellows type expansion joint device for pipes, and in particular, the welding distance between the bellows pipe and the flange is welded to ensure the minimum clearance distance between the opposing flanges, thereby reducing installation defects during manufacturing. It relates to an expansion joint device for piping that can be simplified.

In general, in industrial plumbing equipment, a plurality of metal pipe members (pipes) are connected through various types of coupling methods, and this coupling method maintains the electric field between the pipe members to be largely connected after coupling. It is divided into a fixed pipe joint method and a flexible pipe joint method, in which the electric field between the pipe members to be connected is stretched or shrunk more or less flexibly due to the surrounding environment or other factors even after coupling.

In the fixed pipe joint method, the flanges are usually attached to the front end of the pipe member by means of joining means such as welding, and then screwed together between the joined flanges.

In addition, in the flow type pipe joint system, in consideration of thermal expansion of the pipe member to be connected, the joint portion is to use a stretch joint device that can artificially adjust the length slightly elastically by heat.

As shown in FIG. 1, the expansion and contraction device for pipes is integrally formed at both ends of the bellows pipe 10, which is a thin pipe bent in a wave shape along the electric field, and both ends of the bellows pipe 10. Consisting of the flange 20, the flange 20 is to be screwed and coupled to the flange (not shown) mounted on the front end of the corresponding pipe member (not shown) when piping, the bellows pipe ( 10) shows that the length of the member is stretched or shrunk somewhat to absorb when the corresponding length of the pipe is variably expanded and contracted due to the heat of the fluid flowing into it or the factors of the surrounding environment. It can be.

In addition, the expansion joint device compensates for the change in the overall length of the piping equipment according to the thermal expansion and contraction of the pipe member to maintain the appearance of the piping equipment as it is, as well as the flow of fluid rapidly in the pipe member The vibration of the pipe member can be absorbed by attenuating the pulsation generated when a sudden change occurs.

To this end, the flange 20 is provided with a plurality of through holes 21 for fastening radially.

On the other hand, between the flange 20 is integrally coupled to both ends of the bellows pipe (10) is a bar-shaped tie rod 30 of a slightly longer length is fastened through the nut 31, the flange ( 20) limit the maximum separation distance, which is installed for the purpose of preventing the damage of the member in advance by artificially limiting the limit of the maximum separation distance that the member can be extended when the bellows pipe 10 is extended. will be.

And when manufacturing the expansion joint, the bellows pipe 10 is a thin thin tube is made of a material of stainless steel, which is usually excellent in corrosion resistance for resistance to corrosion, the flange 20 is It is made of ordinary steel material which is relatively inexpensive.

Therefore, when the piping work using the expansion joint as described above, when the high-temperature fluid such as steam flows into the inside of the tube member, even if the tube member is deformed to extend the electric field by thermal expansion the expansion joint device The bellows pipe 10 of the bellows contraction in the longitudinal direction not only maintains the entire length of the pipe line the same as before the heat deformation, but also the bellows by the amount of shrinkage deformation of the pipe member even when the cool fluid flows in the pipe member As the tube 10 is extended, the amount of shrinkage can be compensated for.

By the way, in the conventional expansion joint device as described above, the front circumference of the opening of the flange 20, which is slightly thicker in steel, is joined to the front circumference of the thin bellows-type bellows tube 10 of stainless steel by argon welding. As a result, the welding work between the heterogeneous materials of the stainless steel and the steel material is difficult, and the rigidity of the weld zone ("X") is weak due to the change in the material properties of the welding site. There was this.

In addition, in the plumbing installation in the vertical direction in the piping operation using the expansion joint device, a plurality of steel reinforcing bar (not shown) of the length corresponding to the separation distance between them between the flange 20. Since the bellows pipe 10 should not be contracted in the longitudinal direction even in the load of the pipe member applied in the vertical direction by fixing it through the temporary welding, it takes not only a process required for piping work but also after completion of the piping work. If you do not remove the reinforcement bar, the expansion joint was not able to function properly had a disadvantage.

Therefore, the present invention was devised to solve the above disadvantages, so that the maximum separation distance and the minimum separation distance between the flanges opposed to each other while joining the bellows pipe and the flanges coupled to both ends thereof without welding. Therefore, the object of the present invention is to provide a pipe expansion and contraction device that can improve workability by pursuing simplicity even during installation work by eliminating the change of the material caused by welding during manufacturing.

1 is a perspective view of a conventional bellows type expansion joint device for piping,

Figure 2 is a perspective view of a bellows type expansion joint device for piping according to the present invention,

3 is a side view of FIG.

Figure 4 is a perspective view showing a state of use of the expansion joint device for piping according to the present invention,

5 is a half cross-sectional view of FIG. 4.

<Description of the code | symbol about the principal part of drawing>

10-Bellows Tube 20-Flange

30-tie rod 40-buffer

50-corresponding pipe member 51-corresponding flange

52-sealing element 60-bolt

61-nut

The present invention for achieving the above object, the front end portion of the bellows pipe having a curved portion curved along the entire length is bent and fixed to the outer surface of the flange on the outside over the opening through the flange, A buffer member is fitted to the outer circumferential surface of the tie rod which is fastened between the flanges to limit the maximum separation distance, so that the minimum separation distance between the flanges is ensured.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a perspective view of the expansion joint device for piping according to the present invention, Figure 3 is a side view of Figure 2, the same reference numerals as in Fig. 1 showing a conventional expansion joint device for piping to denote the same reference numerals together do.

The expansion joint device for piping according to the present invention, as shown in the drawings, the bellows pipe 10 of the thin tube having a corrugated portion bent in a wave shape along the entire length is coupled to the flange 20 located at both ends by no welding. While being made, the tie rod 30 that limits the maximum separation distance between the flange 20 is added to the function that can ensure the minimum separation distance between the flange 20.

That is, the front end portion of the bellows pipe 10 is bent at approximately 90 ° from the outside through an opening provided to penetrate the central portion of the flange 20, and is fixed to face the outer surface of the flange 20.

In addition, the tie rod 30 is fastened through them so as to limit the maximum separation distance between the flange 20 is a cylindrical cushioning member 40 of shrinkage, such as rubber is fitted on its outer peripheral surface, The overall length of the shock absorbing member 40 is slightly smaller than the separation distance between the flanges 20 so as to flexibly ensure the minimum separation distance between the flanges 20.

Accordingly, the expansion joint is welded between heterogeneous materials by eliminating the welding process as a joining means in the coupling between the bellows pipe 10, which is a thin-walled stainless steel material, and the flange 20 of the general steel material during manufacture. Due to the transformation of the weld site due to the stiffness weakness problem of the weld site can be eliminated.

And, when the piping in the vertical direction during the piping operation using the expansion joint device, the flange so that the bellows pipe 10 is not contracted in the longitudinal direction by the load of the pipe member applied in the vertical direction as in the prior art Even if the steel reinforcing bar of the length corresponding to the separation distance between the 20 is not fixed by the temporary welding, the cushioning member 40 fitted to the outer peripheral surface of the tie rod 30 can ensure the minimum separation distance between the flange 20 It is possible to prevent the shrinkage deformation of the bellows pipe 10 according to the load of the pipe member, so as to reduce the hassle of removing the reinforcing bar welded between the flanges 20 after installation of the piping line as in the prior art. do.

On the other hand, the use state of the expansion joint device made of a combination of the bellows pipe 10 and the weld 20 as described above is as shown in Figures 4 and 5, corresponding to the outer surface of the flange 20 The corresponding flange 51 joined to the front end of the pipe member 50 is screwed with a sealing member 52 such as a gasket therebetween.

In this case, the sealing member 52 is a bellows pipe 10 bent to the outside of the flange 20 by a fastening force to the plurality of bolts 60 and nuts 61 fastened between the flange 20 and the corresponding flange 51. Since the tip portion of the to be firmly in close contact with the flange 20, the concern about the airtight between the bellows pipe 10 and the corresponding pipe member 50 is removed.

Therefore, when the pipe work through the expansion joint as described above, the bellows pipe 10 in the longitudinal direction even if the corresponding pipe member 50 is deformed to extend or shrink the entire length of the pipe line by thermal expansion and contraction As the shrinkage is extended, the entire length of the pipe line can be maintained the same as before the heat deformation, and when the pipe work is carried out in the vertical direction, the nut 31 is interposed between the flanges 20. The shock absorbing member 40 inserted into the outer circumferential surface of the tie rod 30 to be fastened elastically absorbs the load of the pipe member acting in the axial direction to ensure the minimum length of the bellows tube 10 to prevent damage. .

And above all, since the coupling between the bellows pipe 10 and the flange 20 is made of no welding when the expansion joint device is manufactured, it is possible to solve the problem of local stiffness caused by welding.

As described above, according to the expansion joint device for piping according to the present invention, the coupling between the bellows pipe 10 and the flange 20 is made of no welding, the outer circumference of the tie rod 30 is fastened between the flange 20 As the cushioning member 40 is fitted on the surface, the workability can be improved even during plumbing in the vertical direction while eliminating stiffness and product defects caused by the transformation of the material due to welding during fabrication. Will be.

Claims (2)

The bellows pipe having a curved curved portion along the entire length, a flange coupled to both ends of the bellows pipe, and a tie rod fastened between the flanges to limit the maximum separation distance of the pipe member, the thermal deformation of the pipe member In the expansion joint device to keep the length of the piping line constant even when And an end portion of the bellows pipe is bent and fixed to face the outer surface of the flange at an outer side of the opening through the flange. The expansion joint device for a pipe according to claim 1, wherein a cushioning member is inserted into an outer circumferential surface of the tie rod fastened between the bellows pipe and the flange so as to elastically ensure a minimum separation distance between the flanges.