JP2000320760A - Pipe joint improving base isolation property and sealing property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint providing a high sealing performance and an excellent base isolation property when pulling force acts on a pipe and pulling and bending forces act thereon in a complex manner. SOLUTION: In this pipe joint, flange fringes 2, 2a formed by symmetrical shapes are formed in end parts of pipes to be joined 1, 1a, respectively, and a packing 4 in which a ring 5 is fitted in an outside diameter face is interposed and is tightened in the direction of diameter shrinkage by housings 6, 6a when the flange fringes 2, 2a abut mutually to connect the pipes 1, 1a. At this time, a clearance (a) is formed among the flange fringes 2, 2a and the ring 5 to absorb stress and increase the base isolation property while providing the sealing property when bending force acts on the pipes to be joined 1, 1a due to the action of the clearance (a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pipe joints such as water pipes, various liquid transport pipes, and gas transport pipes for gas and the like, and is characterized by improving seismic isolation and sealing performance.

[0002]

2. Description of the Related Art When a load is applied to a pipe due to an earthquake or the like, absorbing the load to prevent breakage or leakage of fluid from a connection portion is the most important in minimizing damage. It is an issue.

For this purpose, when a load is applied to the pipe, a bending occurs at the connection portion to absorb the load.
A proposal for a pipe joint for preventing breakage and leakage is known (Japanese Patent Application No. 8-190018).

In this known example, the ends of two pipes having the same cross section, whose entire circumferences are bent to the outer peripheral side to be rounded, are opposed to each other and are arranged in a circumferential direction of a joint portion of the pipes. A band for holding the round edges of the two tubes together, and a band fastener for reducing the circumferential length of the band, wherein the plate edge of the round edge has a gap with the outer circumference of the tube, and tightens the band. This is a pipe joint that connects two pipes so that they can absorb the expansion and contraction and refraction of the pipes, and the entire circumference of the end is bent to the outer circumference side. The two pipes having the same cross section have opposite ends in contact with each other, and a band arranged in the circumferential direction of the joint of the pipes and holding the round edges of the two pipes together, and a band in the direction of shortening the circumferential length of the band. A band fastener is provided, and the plate edge of the round edge has a gap with the outer periphery of the pipe, and the band is tightened by a fastening means. Accordingly, by Maruen are pressed against resiliently together, stretching of the tube, is that allows absorbing refraction and vibration.

[0005]

However, in the above-mentioned known example, the sealing performance when a bending force is applied to the connecting portion is high, but since the sealing portions are in close contact with each other at the rounded edges (curled portions), the piping direction is reduced. When pulling acts on or when bending and pulling force are combined, the allowable range for ensuring close contact (seal) is narrow, and if a seal material is interposed, this seal material may be damaged. Is big.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe joint having excellent seismic isolation which ensures high sealing performance particularly when a pulling force acts on piping and when a pulling and bending force acts in a complicated manner. To provide.

[0007]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, in a pipe joint, both ends of a pipe to be joined are expanded outward to form a flange edge integrally. After interposing a packing with a presser ring on the outer peripheral surface between the flange edges, a plurality of split housings with a U-shaped cross-section fitting groove formed on the inner diameter side are covered with both flange edges. By diametrically connecting the tubes together, crushing the packing together, the ring keeps the packing from escaping in the radial direction, and additionally leaves a small gap between the flange edge and the ring, Are connected to each other by the action of (1) to absorb the stress in the bending direction, thereby ensuring seismic isolation and sealing.

Further, in the invention according to claim 2,
The invention according to claim 1 is characterized in that a packing press ring is integrally formed on the inner wall surface of the fitting groove formed on the inner diameter side of the housing.

Further, in the invention according to claim 3,
The invention according to claim 1 or 2, wherein a taper having a C-shaped cross section is formed on both sides of the inner surface of the fitting groove in the housing.

Further, in the invention according to claim 4,
In the invention described in claim 1, 2 or 3, the housing is divided into two, three or four in a circumference.

Further, in the invention according to claim 5,
In the invention described in claim 1, 2 or 3, the housing is divided into right and left.

[0012]

When the pulling force and the pulling and bending forces act on the joint of the pipe in combination, the housing embraces the flange edge formed at the end of the pipe. In the housing, the flange edges of the pipe ends bend in the free direction in the 360 ° direction by the action of the minute gap, and flexibly absorbs bending stress. Also, when the bending force is applied, the packing is pressed against escape in the radial direction by the ring,
There is no decrease in sealing performance.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is an exploded perspective view of a pipe joint according to the present embodiment, in which reference numerals 1, 1a are pipes to be joined, and 2, 2a are pipes 1, 1 to be joined.
a flange edges formed by expanding the pipe ends 1 ', 1a' outward, and the flange edges 2, 2a are warped rearward at the tips 3, 3a, and the opposing surfaces are convex curved surfaces. 3 ', 3a'.

Reference numeral 4 denotes a ring-shaped seal packing, 5 denotes a metal ring fitted to the outer diameter surface of the packing 4, and 6 and 6a denote two-piece (semicircular) housings. A fixing plate 9 having a hole 10 for tightening using a bolt 7 and a nut 8 is attached to both ends of the fixing plate 9.
The housings 6 and 6a have an inverted U-shaped fitting groove 11 formed on the inner diameter side, and the inner surfaces of both side plates 12, 12a of the fitting groove 11 are narrowed in the depth direction. Tapers 13 and 13a are provided in a letter shape.

As shown in FIGS. 2 and 3, the above-mentioned pipe joints are joined by interposing a packing 4 with a ring 5 between flange edges 2 and 2a of pipes 1 and 1a to be joined. , 6a and tightened with bolts 7 and nuts 8 to reduce the diameters of the housings 6, 6a.
2a is pressed and connected. At this time, as shown in FIG. 4, the packing 4 is crushed, but a gap a is formed between the ring 5 and the flange edges 2 and 2a. As a result, for example, in FIG. 4, when a load (bending) acts on the joining target pipe 1a side from the direction shown by the arrow b,
As shown in FIG. 5, in the housings 6, 6a, the packing 4 and the ring 5 in the upper half move to the flange edge 2 side and the gap a disappears, but a gap is generated outside the tip 3a.
On the other hand, in the lower half, while the sealing property and the gap a are secured by the elasticity of the packing 4, the bending angle θ is formed in the pipes 1 and 1a.
Occurs. Although the load is absorbed at the angle θ, this effect is exerted in the direction of 360 ° of the circumference of the tube.

The embodiment of FIG. 6 corresponds to claim 2,
The ring 5 is formed integrally with the packing 4 on the inner diameter surface of the fitting groove 11 of the housing 6, 6a. In this embodiment as well, the diameter of the packing 4 is increased in the radial direction by the ring 5 as in the above embodiment. Hold down deformation.

In the embodiment shown in FIGS. 1 to 6, the sectional shapes of the packing 4 and the ring 5 are not limited to the embodiment. Further, the packing 4 and the ring 5 may be integrated, or may be provided with edges or irregularities so as to be difficult to separate. For example, as shown in FIG.
May be used in combination with those having a circular cross section. or,
In the case of the embodiment, the housings 6 and 6a are divided into two parts on the circumference. However, in terms of size, weight, workability, etc., the circumference is divided into three or four parts, or one divided into two parts on the left and right with bolts and nuts. You may make it use integrally like the form shown in FIGS.

FIG. 8 (a) shows a tube end 1 ', 1a' vertically bent outward, and a ring 5 and a packing 4 are inserted between the bent tube end surfaces to form outer diameters of housings 6, 6a. This is an embodiment of the pipe joint in which the width is reduced to connect the pipes, and at the same time, the seismic isolation and the sealability are improved. (B) shows a C-shaped taper 1 on the outside of the vertically bent pipe ends 1 'and 1a'.
This is an embodiment of the pipe joint in which the pipes are formed by forming c to increase the tightening force of the housings 6 and 6a, thereby connecting the pipes, and at the same time, improving seismic isolation and sealing properties.

[0019]

As described above, according to the present invention, a flange edge is formed at the pipe end of the pipe to be joined, a packing with a ring is interposed between the flange edges, and a gap is formed between the ring and the flange edge. Thereby, the bending stress is absorbed in this gap. As a result, even if a pulling or bending force acts on the pipe, the sealing performance is maintained at the highest level, the joining strength is enhanced, and more excellent seismic isolation is exhibited. Further, by fitting the ring around the outer periphery of the packing or forming the ring integrally with the housing, it is possible to prevent the packing from escaping in the radial direction due to the clamping force.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pipe joint according to an embodiment of the present invention.

FIG. 2 is a side view of a state in which pipes are joined using the pipe joint according to claim 1;

FIG. 3 is a sectional view taken along line AA ′.

FIG. 4 is a sectional view taken along line BB ′.

FIG. 5 is an explanatory view when a bending force acts on a pipe.

FIG. 6 is an explanatory view of an embodiment of the invention described in claim 2;

FIG. 7 is an explanatory view of an example of a combination of packing and a ring.

FIG. 8 is an explanatory view of another embodiment of the pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Pipe to be joined 2, 2a Flange edge 3, 3a Tip 4 Packing 5 Ring 6, 6a Housing 7 Bolt 8 Nut 9 Fixing plate 10 Hole a Gap θ bend angle

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F16L 23/04 F16L 23/04 3J066 F term (reference) 3H016 CA01 CA04 3H104 JA08 JB02 JC08 JC09 JD01 JD09 LF01 LG02 MA08 3J039 AA02 BB01 CA02 3J040 AA15 BA02 HA30 3J048 AA01 BA10 EA29 3J066 AA01 AA26 BA01 BD05

Claims (5)

[Claims] 1. A flange edge is integrally formed by expanding a groove at both ends of a pipe to be welded outward, and a packing having a press ring attached to an outer peripheral surface is interposed between the flange edges. By fitting a plurality of split housings each having a U-shaped cross-section fitting groove on both flange edges and reducing the diameter, the pipes are connected to each other, and the packing is crushed together. In addition, a small gap is left between the flange edge and the ring, and the connected tubes absorb the stress in the bending direction to ensure seismic isolation and sealing. A pipe joint characterized in that it is constructed so as to be able to perform the following operations. 2. The pipe joint according to claim 1, wherein a packing press ring is integrally formed on an inner wall surface of the fitting groove formed on the inner diameter side of the housing. 3. The pipe joint according to claim 1, wherein a taper having a C-shaped cross section is formed on both sides of the inner surface of the fitting groove in the housing. 4. The pipe joint according to claim 1, wherein the housing is divided into two, three, or four around the circumference. 5. The pipe joint according to claim 1, wherein the housing is divided into right and left parts.