JPH09317961A - Pipe joint and tubular body retaining metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe coupling which has such convenience that the machining of the end of a connecting pipe is no more required, and besides, fixes pipes so as to prevent the slipping off of the pipes. SOLUTION: This pipe coupling and a tubular body retaining metal fitting comprises a metallic sleeve 1 which is approximately cylindrical and whose both ends are formed into flare parts 1a, an annular seal member 2, an inward gasket 3, a grip ring 4, an outward gasket 5 and a coupling half 6. The inward gasket 3 is made to be brought in contact with the front side slant surface 4a of the grip ring 4 on its outward slant surface, the outward gasket 5 has a projected stage part 5a, and the outward end surface of the outward gasket 5 is formed into a slant end surface. Also, the grip ring 4 is formed of a metallic platelike member, and the coupling half 6 presses strongly the flare parts 1a and the outward slant end surface of the outward gasket 5 so as to compress and retain the grip ring 4. Also, the tubular body retaining metal fitting 10 is singly formed by the same construction as the above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting tubular bodies (pipes) to each other, and in particular, a pipe joint that does not require treatment of the end portions of the pipe, is simple in work, and can be used only by inserting pipes from both sides. The present invention relates to a tubular body holding fixture for stopping axial movement of a tubular body as a single body.

[0002]

2. Description of the Related Art Joints are used for interconnecting pipes for piping, which are widely used in industrial equipment and facilities. In order to secure the pipes to each other and seal the joints, various structures have been conventionally used. Proposed. A structure such as a flange method, a screwing method, and a welding method is mainly used as a structure with a strong fixing means, but the efficiency of piping work is poor,
Also, there was no fear of leakage due to excessive mounting.

Therefore, it is often the case that a simple joint which does not require threading, welding or the like for the joint portion of the piping pipe and can absorb some eccentricity between the pipes is used. The simple joint is designed so that a rubber gasket and a retainer are attached to both ends of the sleeve member by a coupling, and the elasticity of the gasket ensures the sealability of the pipe ends. It can be connected only by tightening the ring. Depending on the application, it is also possible to connect the pipes to each other by inserting the respective pipes into the joints, which are assembled into a single member, from both directions.

In the above simple joint, the rubber gasket is structured to be in close contact with the pipe by tightening the coupling, so that the connected pipe is allowed to move in the axial direction. However, when the pipe moves and the pipe comes out, the internal fluid leaks, which is very dangerous and may cause a serious accident when the internal fluid is at a high temperature or is a dangerous chemical substance. Therefore, in order to ensure safety, it is necessary to additionally take measures to prevent the pipe from coming off by fixing the pipe to the floor, wall surface, etc., which has increased costs in terms of members and man-hours.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the workability is poor in the joint having the structure having the strong fixing means as described above, and on the other hand, in the simple joint, the pipe fixing means must be used together. It was created in view of the fact that each has its own difficulties, it does not require the terminal processing of the connecting pipe, has the same convenience as a simple joint, and can easily connect pipes, while at the same time moving the pipe by itself. The purpose of the present invention is to propose a pipe joint with a new structure that can suppress the above and does not require removal prevention such as fixing of the pipe. In addition, a tubular body holding metal fitting for use as a single body for preventing movement of the tubular body (pipe) is also proposed with the same configuration.

[0006]

The pipe joint of the present invention has a flared portion (1a) in which both ends are expanded by an inner diameter corresponding to the outer diameter of a predetermined tubular body (P) with both ends being substantially tubular. And a pair of holding metal fittings (10, 10) that engage with the tubular body (P) at both ends of this sleeve (1).
The holding metal fittings (10, 10) are the annular seal material (2) and the inner gasket which are located in order from the sleeve end outward in the pipe axial direction.
(3), the grip ring (4), the outer gasket (5), and the coupling half (6) that tightens them from the outside.The inner gasket (3) has a substantially annular shape and has the tubular shape at the center. The body (P) has a through hole that is slightly larger than the outer diameter of the body (P), and the inner slant end face that contacts the sleeve (1) has a slope shape corresponding to the inner wall slope of the flare portion (1a). A step for fitting an annular seal material (2) such as an O-ring is formed on the inner peripheral edge of the end face so that the outer slant end face abuts the front slope (4a) of the grip ring (4). The outer gasket (5) has a substantially annular shape and has a through hole at the center, which is slightly larger than the outer diameter of the tubular body (P), and a protruding step portion at the edge of the inner end surface. (5a) and the outer end face is formed as a beveled end face that narrows outward toward a small diameter, and the grip ring (4) is elastic. Abundant metal plate-like member whose inner diameter in the axial direction corresponds to the outer diameter of the tubular body (P) and whose outer diameter in the axial direction protrudes from the outer gasket (5). The coupling half is formed into a substantially truncated conical side surface shape corresponding to the inner diameter of the stepped portion (5a).
(6) is an annular metal member having a substantially open-leg U-shaped cross section with an opening on the axial center side, and the inner wall both slopes are flared portions (1a) of the sleeve (1).
Of the outer gasket and the outer beveled end surface of the outer gasket (5), and the inner gasket (3) and the outer gasket (5) are brought closer by reducing the diameter in response to the tightening in the circumferential direction. Each part is configured to compress and hold the grip ring (4) by applying strong pressure in the direction.

Further, in the present invention, the tubular body holding metal fitting for locking the outer peripheral wall of the tubular body to prevent the axial movement thereof is penetrated through the central hole slightly larger than the outer diameter of the predetermined tubular body (P). And a substantially annular grip guide (5) with a protruding step (5a) formed on the edge of one surface, and a large-diameter side made of highly elastic metal with the protruding step of the grip guide (5) (5a) corresponding to the inner diameter and the smaller diameter side corresponds to the outer diameter of the tubular body (P), the grip ring (4) having a substantially frustoconical shape, and the protruding step of the grip guide (5). Part (5a) is a circle with a large diameter side abutting on the grip ring (4) and a central hole slightly larger than the outer diameter of the tubular body (P) at the center. The annular pressure ring (3) and the grip guides (5) and the pressure ring (3) located on both sides of the grip ring (4) are strongly pressed in the approaching direction and the grip ring (3) is pressed. Pulling (5)
And a pressing means (6) for compressing and holding.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the accompanying drawings with reference to Examples. One embodiment of the present invention is shown in FIGS. FIG. 1 (a) shows a pipe joint (20) according to the present invention.
FIG. 1 (b) is an enlarged sectional view of the essential part (reference numeral Z) of this pipe joint. FIG. 2 is a radial partial sectional view of the same embodiment. The tubular body (P) corresponding to the pipe joint (20) (hereinafter also referred to as pipe (P)) is shown by a chain line.

The pipe joint (20) of the embodiment is roughly composed of a sleeve (1) and a pair of holding metal fittings (10, 10) to be engaged with both ends of the sleeve (1) together with a pipe (P). ing. You can also connect by assembling only the pipe joint as a single unit and inserting the pipes (P) from both ends.

The sleeve (1) is a substantially tubular metal member such as steel or stainless steel, and has a continuous straight tube with an inner diameter corresponding to the outer diameter of a predetermined pipe (P) to be joined at least near both ends thereof. In the center, a bellows-shaped curved portion is formed so as to elastically absorb the eccentricity and the axial movement of the connection pipe. Flare-like portions (1a) are formed on both ends of the sleeve (1) and spread along the axial direction.

Retaining metal fittings (1
(0,10) The annular seal material (2), the inner gasket (3), the grip ring (4), the outer gasket (5), and the outer gasket (5), which are located in this order from the sleeve end outward in the pipe axial direction, respectively. It consists of a tight coupling half (6).

The inner gasket (3) is a substantially annular metal member such as steel or stainless steel.
There is a through hole that is slightly larger than the outer diameter of (P), and the inner slanted end face on the side that engages with the sleeve (1) has an inner wall sloped surface (shaft side surface) of the flared portion (1a). ), Which is substantially the same as the shape of (1), and a step portion for fitting an O-ring as an annular seal material (2) is formed at the inner peripheral edge of the end surface. The ring seal (2) is a pipe
It suffices that it be in contact with the outer periphery of (P) and the slope of the inner wall of the sleeve (1), and an elastic member such as rubber having an appropriate shape may be used and the stepped portion may also have a corresponding shape.

The outer beveled surface of the inner gasket (3) is attached to the grip ring (4) described in detail later (front side beveled surface (4a)).
The center side has a slanted shape so as to abut, and the outer peripheral part is a vertical surface that comes into contact with the tip of the protruding step portion (5a) of the outer gasket described later.

The outer gasket (5) is a metal member made of steel or stainless steel, which has the same outer diameter as that of the inner gasket (3) and has a substantially annular shape, and is slightly smaller than the outer diameter of the pipe (P) in the center. Has a large central hole that penetrates the outer peripheral edge of the inner end face (sleeve side) to the sleeve side.
It is formed in (5a). The inner diameter of the projecting step portion (5a) is made to substantially match the outer diameter of the grip ring (4) described later. The outer end face on the opposite side is formed as a beveled end face that narrows outward toward a small diameter.

The above inner gasket (3) and outer gasket
The grip ring (4) interposed between (5) is a plate-like member made of steel or stainless steel, which is rich in elasticity, and is clearly shown in the front view and side view of FIG. It is formed in a substantially frustoconical side surface shape, and the smaller diameter side diameter dimension of the axially inner end corresponds to the outer diameter of the tubular body (P).
In addition, the diameter on the large diameter side of the outer end in the axial direction is the outer gasket (5).
It corresponds to the inner diameter of the protruding step (5a).

The coupling half (6) is an annular metal member having a substantially open-legged U-shaped cross section, which is open on the axial center side. In the embodiment, the coupling half (6) is divided into two parts, which can be seen more clearly in FIG. The above-mentioned members are wrapped around the entire circumference with the spacers (9, 9) sandwiched therebetween. The upper and lower coupling halves (6A, 6B) each have inner walls on both sides with the sleeve (1).
Outer slope of flare part (1a) and outer gasket (5)
It is designed to come into contact with the outer beveled end surface of the. Then, when two sets of bolts (7) and nuts (8) are tightened in the circumferential direction, the diameter is correspondingly reduced and the inner gasket (3) and the outer gasket (5) are approached by the inner wall slope. The grip ring (4) is compressed and held by applying strong pressure in the direction. The spacers (9, 9) may not be used, or the ends of the divided members may be connected by a hinge structure and screwed only at the open ends.

The method of using the pipe joint of the embodiment will be described below.
To the ends of the two pipes, which were simply cut at both ends,
The inner gasket (5), the grip ring (4), and the inner gasket (3) are oriented in this order (Fig. 1 (a),
through the inner gasket (5) and sealing member (2)
Fit the O-ring as shown in the figure, and align the coupling half (6, 6) with the spacer (9,
Assemble with 9) together with bolts and nuts, and tighten the screw to the specified position.

While tightening the screws, the coupling halves, etc. correspondingly decrease in diameter during this time, and the inner wall slopes strongly press the inner gasket (3) and the outer gasket (5) from the front and back. The grip ring (4), to which the large diameter portion is fixed, is compressed and the small diameter portion is reduced in diameter to firmly adhere to the outer periphery of the pipe (P). At both ends of the sleeve (1) pipe (P,
Since P) is fixed, there is no axial movement between the pipes. It should be noted that the grip ring (4) will be reduced in diameter and bite firmly into the pipe, especially when a force is applied in the direction of pulling out the pipe, so that it will not come off easily.

Further, in addition to the above-mentioned usage, all the parts are assembled and placed as a single pipe joint, and the ends of the pipe (P) are strongly pushed from both ends of the pipe joint to push the two pipes to each other. Can be connected. Even in this case, if a certain amount of force is applied, the pipes can be easily joined and the sealing property is sufficient, and the joint part once assembled firmly prevents this against movement of the pipe in the drawing direction. No auxiliary measures are required to prevent movement.

Since the pipe joint (20) of the embodiment can be easily disassembled by removing the coupling half by opening the bolts and nuts, it is relatively easy to deteriorate in each member.
The ring has the advantage that it can be replaced if necessary and can be used for a long period of time with simple repair. Moreover, it has a high sealing performance by using an O-ring of which reliability is established.

In this way, in the pipe joint (20) of the embodiment, the pipes are prevented from coming off by disposing the sleeves (1) at opposite ends in opposite movement prevention directions to prevent the pipes from moving in the remote direction. However, the above-mentioned holding metal fitting functions as a tubular body holding metal fitting as a single body for firmly restraining only the movement of the tubular body (or rod-shaped body) in a predetermined direction and for locking the tubular body.

Therefore, a mechanism similar to the above-mentioned holding metal fitting can be used as a holding metal fitting for a tubular body (or rod-shaped body) as a single unit. In this case, the holding metal fitting is fixed to the floor, the wall, or the appropriate supporting portion by an appropriate means.

The tubular body holding metal fitting of the present invention is the above-mentioned holding metal fitting.
It has the same structure as (10), that is, it has a through hole in the center that is slightly larger than the outer diameter of the prescribed tubular body (P) and has a protruding step (5a) on the edge of one side. And a substantially annular grip guide (5) (similar to the outer gasket described above),
Made of highly elastic metal, the large diameter side dimension is the grip guide
A grip ring (4) of substantially frustoconical shape that corresponds to the inner diameter of the protruding step portion (5a) of (5) and the small diameter side dimension corresponds to the outer diameter of the tubular body (P); The grip ring in which the large diameter side is brought into contact with the base of the protruding step (5a) of the guide (5)
A ring-shaped (equivalent to the above-mentioned inner gasket) pressure ring (3) that comes into contact with (4) from the small diameter side and has a central hole that is slightly larger than the outer diameter of the tubular body (P) in the center. )
And, the grip guide (5) and the pressing ring (3) located on both sides of the grip ring (4) are strongly pressed in the approaching direction to compress and hold the grip ring (5). And the like) and a pressing means (6) for locking the outer peripheral wall of the tubular body (P) to prevent axial movement. The operation and the like of this tubular body holding metal fitting are exactly the same as those of the above-mentioned pipe joint, and a repetitive description thereof will be omitted.

In the above description, the equivalent outer gasket (5) and grip guide (5) are provided in correspondence with the description of the embodiment.
The same reference numerals are given to the inner gasket (3) and the pressing ring (3), and the coupling half (6) and the pressing means (6). The tubular body holding metal fitting can be used for preventing movement of the pipe, preventing the pipe from coming off, etc. by attaching it to the pipe at a place other than the joint.

In the embodiment described above, the grip ring
Although the simple shape shown in FIG. 3 is used as (4), various modified grip rings can be used. For example, instead of the "one-piece type" of the embodiment, it may be a "separate type" in which a cutting portion is provided, that is, as shown in FIG. good. In Fig. 4 (a), the notch is left as a gap in the used state.
As shown in (b), the size may be a two-layer structure in which a part of them overlaps in use. This shape has an advantage that it can be formed by roll processing or the like.

Further, by providing a plurality of teeth by making a short notch in the radial direction at the small diameter end (grip portion) of the grip ring, the centripetal direction surface pressure is increased and the grip force is strengthened. Fig. 5 shows such an example. In Fig. 5 (a), mountain teeth are formed on the inner circumference, and in Fig. 5 (b), tooth teeth are formed on the inner circumference to improve the gripping property. There is.

Further, as shown in FIG. 6, the grip performance is similarly enhanced by making a cut at the small diameter end (grip portion) of the grip ring.

[0028]

As described above, the pipe joint of the present invention has the above-described structure, that is, the both ends are flared by expanding both ends with an inner diameter corresponding to the outer diameter of a predetermined tubular body. And a pair of holding metal fittings that engage with both ends of the sleeve together with the tubular body. The holding metal fittings are annular sealing members and inner rings that are sequentially located outward from the sleeve end in the pipe axis direction. The inner gasket has a substantially annular shape and a central hole that is slightly larger than the outer diameter of the tubular body is formed in the center of the inner gasket, the grip ring, the outer gasket, and the coupling half that tightens them from the outside. A step portion for fitting an annular seal material such as an O-ring is formed on the inner peripheral edge portion of the end surface on the inward slant end surface that is in contact with the sleeve, the slant shape corresponding to the inner wall slant surface of the flare portion. Done The outer beveled end surface is configured to abut the front beveled surface of the grip ring, and the outer gasket has a substantially circular ring shape and a central hole that is slightly larger than the outer diameter of the tubular body at the center. The inner end face has a protruding step portion and the outer end face is formed as a beveled end face that narrows outward toward a small diameter, and the grip ring is a metal plate-shaped member having high elasticity. The smaller diameter side inward in the direction corresponds to the outer diameter of the tubular body, and the larger diameter side outward in the axial direction corresponds to the inner diameter of the protruding step of the outer gasket in a substantially frustoconical side surface shape. The coupling half is formed of an annular metal member having a substantially open-leg U-shaped cross section with an opening on the axial center side, and the inner wall both slopes are the outer slope of the flare portion of the sleeve and the outer slope of the outer gasket. Abut the end face,
Since each part is configured to compress and hold the grip ring by compressing the inner gasket and the outer gasket in a direction approaching each other by reducing the diameter corresponding to the tightening in the circumferential direction, Similar to the simple joint, it has the convenience of not requiring the end processing of the connecting pipe, and at the same time, prevents the pipe from falling out by firmly suppressing movement of the pipe, especially movement in the drawing direction. Therefore, a separate member for preventing removal is not required at all, which leads to cost reduction. If the coupling half is disassembled, there is an advantage that the seal member can be easily replaced.

Further, the tubular body holding metal fitting of the present invention has a substantially annular shape in which a central hole that is slightly larger than the outer diameter of a predetermined tubular body is formed in the center and a protruding step portion is formed at the edge of one surface. The grip guide is made of highly elastic metal and the large diameter side dimension corresponds to the inner diameter of the protruding step portion of the grip guide and the small diameter side dimension corresponds to the outer diameter of the tubular body. The grip ring and the protruding step base of the grip guide are in contact with the large diameter side from the small diameter side, and a central hole that is slightly larger than the outer diameter of the tubular body is formed in the center. Since it is composed of an annular pressing ring, the grip guides located on both sides of the grip ring, and pressing means for compressing and holding the grip ring by pressing the pressing ring in the approaching direction, a simple structure is obtained. A tubular body (stick Including the body) can be utilized periphery wall fixed like hooking and it is possible to prevent the axial movement piping.

[Brief description of drawings]

1A is an axial half sectional view showing an embodiment of a pipe joint and a tubular body holding metal fitting of the present invention, and FIG. 1B is an enlarged sectional view of a main part thereof.

FIG. 2 is a partial radial cross-sectional view corresponding to FIG.

FIG. 3 is a front view and a side view of a grip ring according to an embodiment.

4 (a) and 4 (b) are front views showing another embodiment of the grip ring according to the present invention.

5A is a front view and a side view showing still another embodiment of the grip ring according to the present invention, and FIG. 5B is a front view of another example.

6A and 6B are a front view and a side view showing a form example of a grip ring according to the present invention.

[Explanation of symbols]

 (1) ... sleeve, (1a) ... flare, (2) ... annular seal material, (3) ... inner gasket (pressing ring), (4) ... grip ring, (4a) ... front slope, (5) ) ... Outer gasket (grip guide), (5a) ... Projection step, (6) ... Coupling half (pressing means), (10,10) ... Holding fitting, (20) ... Pipe joint, (P) ... Tubular body.

Claims (2)

[Claims] 1. A flared portion (1a) which is substantially cylindrical and whose both ends are flared with an inner diameter corresponding to the outer diameter of a predetermined tubular body (P).
The metal sleeve (1) and a pair of holding metal fittings (10, 1) that engage with both ends of the sleeve (1) together with the tubular body (P).
0) and the holding metal fittings (10, 10) are annular seal materials (2) and inner gaskets that are located in this order from the sleeve end outward in the pipe axis direction.
(3), the grip ring (4), the outer gasket (5), and the coupling half (6) that tightens them from the outside.The inner gasket (3) has a substantially annular shape and has the tubular shape at the center. It has a through hole that is slightly larger than the outer diameter of the body (P),
An inward slanted end surface that engages with the sleeve (1) has a slanted surface shape corresponding to the slanted inner wall surface of the flared portion (1a), and an annular seal material (2) such as an O-ring is fitted to the inner peripheral edge of the end surface. Has a step for the grip ring on the outer beveled surface.
The outer gasket (5) is configured to abut the front slope (4a) of (4), and the outer gasket (5) is a substantially circular ring and has a central hole that is slightly larger than the outer diameter of the tubular body (P) in the center. Has a protruding step (5a) at the edge of the inner end surface and the outer end surface is formed as a beveled end surface that narrows outward toward a small diameter, and the grip ring (4) is elastic. It is a metal plate-shaped member rich in metal and has a small diameter side inward in the axial direction corresponding to the outer diameter of the tubular body (P), and a large diameter side in the axially outward direction corresponds to the outer gasket (5). It is formed into a substantially frustoconical side surface shape corresponding to the inner diameter of the projecting step portion (5a), and the coupling half (6) is an annular metal member having a substantially open leg U-shaped cross section with an opening on the axial center side and an inner wall. Both slopes come into contact with the outer slope of the flare portion (1a) of the sleeve (1) and the outer slope end of the outer gasket (5), and the diameter is reduced in accordance with the tightening in the circumferential direction. Inner gasket (3) and outer gasket (5)
A pipe joint characterized in that it is configured to compress and hold the grip ring (4) by applying strong pressure in a direction in which and are approached. 2. A tubular body holding metal fitting for locking the outer peripheral wall of the tubular body (P) to prevent axial movement thereof, wherein the tubular body (P) penetrates slightly larger than the outer diameter of the predetermined tubular body (P). A substantially annular grip guide (5) with a central hole and a projecting step (5a) on the edge of one side, and a metal with a high elasticity and the large diameter side dimension is the grip guide
A grip ring (4) of substantially frustoconical shape that corresponds to the inner diameter of the protruding step (5a) of (5) and the small diameter side dimension corresponds to the outer diameter of the tubular body (P); The large diameter side of the guide (5) is in contact with the base of the protruding step (5a), and the grip ring (4) is in contact with the grip ring (4) from the small diameter side. The ring-shaped pressing ring (3) with a central hole formed in it, and the grip guide (5) and the pressing ring (3) located on both sides of the grip ring (4) are strongly pressed in the approaching direction. ) A tubular body holding metal fitting comprising a pressing means (6) for compressing and holding