JPH07310871A - Pipe connection structure for fluid piping - Google Patents

Abstract

(57) [Summary] [Object] To provide a means capable of solving the problems of load resistance, workability, and sealability in a conventional pipe connection structure all at once. The shape of both end surfaces of the abutting portion of the conduit P is composed of an annular groove A1 which is recessed in the tube axial direction and the other is the annular groove A1.
The ring-shaped annular protrusion A2 is formed into a ring-like shape, and outer peripheral grooves B1 and B2 recessed in the pipe radial direction are formed in the outer peripheral surface of the contact portion of the conduit P, respectively. The conduit P is arranged so as to be continuous in the pipe axial direction while the annular projection A2 is fitted in the groove A1, and the outer peripheral groove B is arranged.
The tightening ring 1 is provided with collar portions 1a and 1b which can be fitted into the terminals 1 and B2 at inner peripheral portions on both end sides in the width direction.
While being fitted in the outer peripheral grooves B1 and B2, the diameter is deformed and deformed and tightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection structure for a fluid pipe, and more specifically, as a constituent element of a piping facility through which a fluid flows in a pipe, a plurality of conduits are connected in the pipe axial direction. And a pipe connection structure in a fluid pipe in which the contact portions of adjacent pipes of them are integrally connected.

[0002]

2. Description of the Related Art As the piping equipment, for example, a plurality of air transport pipes for transporting dust are arranged so as to be continuous in the axial direction of the pipes, and then the adjacent air transport pipes are connected to each other. An example is one in which the parts are integrally connected. In this piping facility, various kinds of dust come to flow through the air transport pipe along with the flow of air, but since the various kinds of dust contain a considerable amount of hard powder such as sand. When the fluid containing the hard powder flows through the air transport pipe and comes into contact with the inner periphery of the air transport pipe, the air transport pipe is subject to wear at the inner periphery thereof. Therefore,
As an air transportation pipe that withstands the wear, STPY400
(JIS standard) and other carbon steel pipes, high Cr cast iron pipes, bainite cast iron pipes, Cr-Mo steel pipes, Cr-Ni-Mo steel pipes, and other various steel pipes having wear resistance to fluid passing through the pipes (that is, steel pipes or Cast iron pipe) is adopted. These steel pipes are also used in various fluid pipes other than the air transport pipe. And, as a conventional means for integrally connecting abutting portions of adjacent conduits among them, after arranging a plurality of the conduits made of the steel pipe so as to be continuous in the pipe axis direction, A welded joint for directly butt-welding the abutting portions, or a flange joint for preliminarily forming a flange on each of the abutting portions and fastening the abutting portions of the flanges with a bolt / nut is adopted. It was

[0003]

However, when the abutting portions are connected by the welded joint, the abutting portions are connected in a fixed state.
When a phenomenon occurs in which an uneven external force is applied to both sides of the joint connecting the conduits, the joint portion of the joint may not be able to handle the uneven external force and may be damaged, which is a load resistance. There was a sex problem. Because the conduit is not so deformable, when the uneven external force is applied, the effect of the uneven external force is exerted on the connection portion, and the fixed state is affected by the influence. This is because the connection part of can not be endured and may be damaged. In addition, there is a problem of workability such as the troublesome welding work on site. On the other hand, when the abutting portions are connected by the flange joint, the abutting portions are fixedly connected in a planar surface abutting state,
There was a problem of load resistance that the connecting portion had a poor deformability when a bending moment was applied and could not bear the moment load. In addition, there is a problem in workability such as the work of fastening the flange abutting part with bolts and nuts on the site is troublesome, and if the sealing of the part of the interview is not performed securely, that part There is also a problem with the sealing property, such as the problem that the sealing property in the above is likely to become a problem.
The present invention has been made in view of such circumstances, and an object thereof is to provide a means capable of solving the above-mentioned problems of load resistance, workability, and sealability all at once. There is.

[0004]

A characteristic structure of a pipe connection structure (hereinafter, simply referred to as a pipe connection structure) in a fluid pipe according to the present invention is that a pipe connection is used as a component of a pipe facility through which a fluid flows. A pipe connection structure in a fluid pipe in which a plurality of pipes are arranged so as to be continuous in the pipe axis direction, and the contact portions of adjacent pipes among them are integrally connected to each other. The both end surfaces of the portion are formed into a ring-shaped shape in which one is formed of an annular groove that is recessed in the tube axis direction and the other is formed of an annular protrusion that can be fitted into the annular groove, and the outer peripheral surface of the contact portion is formed. An outer peripheral groove that is recessed in the pipe radial direction is formed in advance, and while fitting the annular protrusion into the annular groove,
A plurality of the conduits are continuously arranged side by side in the pipe axis direction, and a tightening ring is provided with flange portions that can be fitted into the outer peripheral groove on inner peripheral portions on both widthwise end sides. The point is that it is tightened by shrinking and deforming while fitting.

[0005]

According to the pipe connecting structure having the above-described characteristic structure, the engagement relation of the seal cage-shaped (that is, the engagement relation of fitting the annular projection into the annular groove) of the conduit is utilized. A plurality of them are arranged so as to be continuous in the pipe axis direction,
While fitting the flange portion of the tightening ring into the outer peripheral groove, the tightening ring is contracted by being radially reduced and deformed, so that the engagement relationship of the seal cage shape and the outer circumference of the flange portion of the tightening ring. Due to the synergistic effect of fitting in the groove, the sealing performance of the pipe connection structure is ensured at a practical level, and even if uneven external force is applied to both sides of the pipe connection structure, Relief of the tightened state of the attachment ring and relief of the engagement relationship of the above-mentioned seal cage-like shape appropriately occur, and the relief can cope with the uneven external force. Further, in order to realize the pipe connection structure, it is not necessary to perform on-site welding work as with conventional welded joints, and the troublesome bolt / nut fastening work on-site as with conventional flange joints is required. It is not necessary, and a simple field work of partially tightening the tightening ring is sufficient.

[0006]

Therefore, according to the pipe connection structure of the present invention,
Problems of load resistance, workability, and sealability, which have occurred in conventional welded joints and flange joints, can be solved all at once, so that the object of the present invention can be achieved. Become.

Further, in addition to having the above-mentioned characteristic structure, between the annular groove and the annular protrusion fitted in the annular groove,
According to the pipe connection structure in which the ring-shaped gasket is interposed, the presence of the gasket further improves the sealability, and the problem of the conventional sealability can be more surely solved. .

In addition to the above-mentioned characteristic structure, each inner end surface of both flange portions of the tightening ring is formed as a taper surface that opens on the inner diameter side, and each of the outer peripheral grooves into which the flange portion is fitted is inserted. On the other hand, in the pipe connection structure, a tapered surface is formed on the side wall surface so as to be able to come into surface contact with the tapered surface in the fitted state, and both tapered surfaces are brought into surface contact when the tightening ring is tightened. According to this, the both tapered surfaces come into surface contact during tightening of the tightening ring, and a wedge action occurs,
Since the contact portions are brought closer to each other by the wedge action, the gasket is further pressed, and the sealing effect by the gasket is further improved, and the problem of the conventional sealing property is more surely solved. Become so.

Further, according to the pipe connecting structure having the above-mentioned characteristic structure, ring-shaped gaskets are respectively interposed between the outer peripheral grooves and the flanges fitted in the outer peripheral grooves. The tightening force of the tightening ring surely presses the both gaskets, and the sealing effect of the gaskets is surely produced, so that the problem of the conventional sealing property is extremely surely solved. Become.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] (Corresponding to Claim 1) FIG. 1 is a longitudinal sectional view of an essential part of a first embodiment of a pipe connecting structure according to the present invention, and FIG. , Its overall cross-section is shown. In the figure, P is an air transport pipe (an example of the above-mentioned conduit) through which various kinds of dust are carried along with the flow of air. Since a large amount of hard powder such as sand is contained in the various kinds of dust, when a fluid containing the hard powder flows through the air transport pipe P and comes into contact with the inner peripheral portion thereof, The air transport pipe P is subject to wear at its inner circumference. Therefore, the material of the air transport pipe P is Cr-M as an example of a material that can withstand the wear.
o Steel pipe is used.

A plurality of the air transport pipes P are arranged so as to be continuous in the pipe axis direction, and the abutting portions of the adjacent air transport pipes P among them are formed by the pipe connection structure of the present invention. They are connected together.

To explain the pipe connection structure in detail, first, the shape of both end surfaces of the contact portion is formed by an annular groove A1 in which one is recessed in the tube axial direction, and the other is freely fit into the annular groove A1. The ring-shaped protrusion A2 is formed in the shape of an inrobot. And, on each of the outer peripheral surface of the contact portion,
Outer peripheral grooves B1 and B2 that are recessed in the pipe radial direction are formed. Further, the collar portion 1a, which can be freely fitted into the outer peripheral grooves B1 and B2,
1b is provided on the inner peripheral portions on both end sides in the width direction, and one of joints divided in two in the radial direction is a pivot support bolt / nut 1.
A tightening ring 1 is prepared which is pivotally connected at d and the other end of the joint is connected by a tightening bolt / nut 1e so as to be able to be tightened / released. Then, while fitting the annular projection A2 into the annular groove A1, a plurality of the air transport pipes P are arranged so as to be continuous in the pipe axial direction, and the collar portions 1a and 1b of the tightening ring 1 are While fitting in the outer peripheral grooves B1 and B2 on the outer peripheral surface of the contact portion, the tightening ring 1 is contracted and deformed to tighten the tightening ring 1, thereby completing the pipe connection structure.

According to such a pipe connection structure of the present invention,
A plurality of air transport pipes P are arranged so as to be continuous in the pipe axial direction by utilizing the engagement relationship of the above-mentioned Inro shape, and the collar portions 1a, 1b of the tightening ring 1 are arranged in the outer peripheral grooves B1, B2. Since the tightening ring 1 is tightened by shrinking and deforming while being fitted, the engagement relationship of the seal ring-shaped and the fitting of the collar portions 1a and 1b of the tightening ring 1 into the outer peripheral grooves B1 and B2. By the synergistic effect of the inclusion, the sealing property in the pipe connection structure will be ensured at a practical level, and even if uneven external force is applied to both sides of the pipe connection structure,
The tightened state of the tightening ring 1 and the engagement relationship of the indentation-filling shape are appropriately relaxed, and the unevenness can cope with the uneven external force.

In the above-mentioned embodiment, the tightening ring 1 is of a radial two-divided type, but the tightening ring 1 may be of a radial three-divided type or more.

[Second Embodiment] (Corresponding to Claim 2) In each of the drawings showing the following embodiments, the same reference numerals as those in the conventional example indicate the same or corresponding portions. FIG. 3 shows a second embodiment of the pipe connecting structure in the fluid pipe according to the present invention. In the second embodiment, the ring-shaped gasket 2 is interposed between the annular groove A1 in the first embodiment and the annular protrusion A2 fitted in the annular groove A1. According to this pipe connection structure, the presence of the gasket 2 contributes to further improvement of the sealing property.

[Third Embodiment] (Corresponding to Claim 3) FIG. 4 shows a third embodiment of the pipe connection structure in a fluid pipe according to the present invention. In the third embodiment, both flange portions 1 of the tightening ring 1 in the second embodiment described above are used.
Each of the inner end surfaces of a and 1b is formed as a taper surface that is open on the inner diameter side, and the outer peripheral grooves B1 and B2 into which the flange portions 1a and 1b are fitted are respectively fitted to the one side wall surface of the taper surface in the fitted state. Form a taper surface that can come into surface contact with
The two tapered surfaces are brought into surface contact with each other when the tightening ring 1 is tightened. According to this pipe connection structure,
The two tapered surfaces come into surface contact with each other when the tightening ring 1 is tightened to generate a wedge action, and the abutting portions are brought closer to each other by the wedge action, so that the gasket 2 is further pressed and the gasket is The sealing effect of 2 is further improved.

[Fourth Embodiment] (Corresponding to Claim 4) FIG. 5 shows a fourth embodiment of the pipe connection structure for a fluid pipe according to the present invention. In the fourth embodiment, the outer peripheral grooves B1 and B2 in the first embodiment and the collar portions 1a and 1 fitted into the outer peripheral grooves B1 and B2, respectively.
According to the pipe connection structure in which the ring-shaped gaskets 3 and 4 are respectively interposed between the gaskets b and b, both the gaskets 3 and 4 are surely pressed by the tightening force of the tightening ring 1,
The gasket 3 and 4 ensure the sealing effect.

[Other Embodiments] In each of the above embodiments,
The material of the air transport pipe P was a Cr-Mo steel pipe,
As its material, in addition to the Cr-Mo steel pipe, STP
Various steel pipes capable of withstanding the wear such as carbon steel pipes such as Y400 (JIS standard), high Cr cast iron pipes, bainite cast iron pipes, and Cr-Ni-Mo steel pipes may be adopted.

Further, in each of the above-mentioned embodiments, the pipe facility for garbage transportation was constructed by adopting the pipe connecting structure of the present invention, but the pipe connecting structure for connecting other pipes also has the following features. It goes without saying that the pipe connection structure of the invention can be adopted.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a pipe connection structure of the present invention.

FIG. 2 is a cross-sectional view thereof

FIG. 3 is a vertical cross-sectional view showing a main part of a second embodiment of the pipe connection structure of the present invention.

FIG. 4 is a vertical cross-sectional view showing a main part of a third embodiment of the pipe connection structure of the present invention.

FIG. 5 is a vertical cross-sectional view showing a main part of a fourth embodiment of the pipe connection structure of the present invention.

[Explanation of symbols]

 1 Tightening ring 1a, 1b Collar part 2, 3, 4 Gasket A1 End face annular groove A2 Annular protrusion B1, B2 Outer peripheral groove P Conduit

Claims (4)

[Claims] 1. A plurality of conduits (P) are arranged so as to be continuous in the axial direction of a pipe as a component of a piping facility through which a fluid flows in the pipe, and adjacent conduits (P) among them are arranged. A pipe connection structure in a fluid pipe in which the abutting parts of are integrally connected to each other, wherein both end face shapes of the abutting part are annular grooves (A1), one of which is depressed in the pipe axial direction, The other has a shape of an Inro Jakuri consisting of an annular projection (A2) that can be fitted into the annular groove (A1), and has a recess in the pipe radial direction on each of the outer peripheral surfaces of the abutting portions. The outer peripheral grooves (B1) and (B2) are formed, and the annular protrusion (A2) is formed in the annular groove (A1).
And a plurality of the conduits (P) are arranged continuously in the axial direction of the pipe while the outer peripheral grooves (B1), (B
2) A tightening ring (1) provided with flange portions (1a), (1b) which can be freely fitted into the inner peripheral portion on both widthwise end sides of the flange portion (1).
A pipe connection structure in a fluid pipe in which a) and (1b) are fitted into the outer peripheral grooves (B1) and (B2), and are deformed by diameter reduction and tightened. 2. The annular groove (A1) and the annular groove (A1)
The pipe connection structure for a fluid pipe according to claim 1, wherein a ring-shaped gasket (2) is interposed between the ring-shaped gasket (2) and the annular projection (A2) fitted in (1). 3. The collar portions (1a) of the tightening ring (1),
Each of the inner end surfaces of (1b) is formed as a taper surface that is open on the inner diameter side, and the outer peripheral grooves (B1), (B2) into which the flange portions (1a), (1b) are fitted are respectively formed on one sidewall surface A taper surface is formed on the taper surface so that the taper surface can freely come into contact with the taper surface, and both taper surfaces are brought into surface contact when the tightening ring (1) is tightened. The pipe connection structure in the fluid pipe according to claim 2. 4. A ring shape is provided between the outer peripheral grooves (B1), (B2) and the flange portions (1a), (1b) fitted in the outer peripheral grooves (B1), (B2), respectively. The pipe connection structure for a fluid pipe according to claim 1, wherein gaskets (3) and (4) are respectively interposed.