JPH09210269A - Housing type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resist extension in an axial direction and rotation and to firmly fasten a pipe. SOLUTION: In this joint, a pair of half annular housings 2, 2 are provided, each housing has a parallel pair of engaging protruded parts 22 along a peripheral direction in both sides in a width direction, and flanges 23, 23, engaged astride annular grooves 61, 61 provided in the vicinity of each connection end face of two pipes 6, 6 connected with these engaging protruded parts 22 and extended to the diametric direction outside from both ends of the engaging protruded part 22, are mutually fastened to a mate flange by bolts 4, 5, so as to connect the two pipes. A locking protrusion part 25 continued in a peripheral direction is provided partly inside a pair of the engaging protruded parts 22, 22, and a plurality of locking pawl parts 26 are provided partly in the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing type pipe joint generally called a victor type.

[0002]

2. Description of the Related Art FIGS. 6 to 8 show an example of a conventional Victorian pipe joint. 6 is a front half sectional view, FIG. 7 is a side half sectional view thereof, and FIG. 8 is an enlarged sectional view of an essential part. This joint has a pair of vertically-symmetrical semi-annular casting housings 10A and 10B, and arcuate projections 11a and 11b are formed on both sides along the inner peripheral edges of both housings. Annular grooves (grooves) 61, 61 are provided in the vicinity of the respective pipe ends of the two pipes 6, 6 to be connected, and the convex portions on both sides of the housings 10A, 10B straddle the annular grooves 61, 61 of both pipes. The parts 11a and 11b are engaged. Further, as shown in FIGS. 6 and 7, a rubber elastic packing 30 is attached along the inner peripheral surfaces of the housings 10A and 10B.
An annular pressure receiving space is formed so as to straddle the respective pipe ends of 6, and both inner peripheral surfaces are attached in close contact with the outer peripheral surfaces of the pipes 6, 6.

Then, the two pipes 6 and 6 are connected by fastening flanges provided at both ends of the housings 10A and 10B with bolts 40 and nuts 50. At this time, the elastic packing 30 has the outer peripheral surface of both housings 10A,
It closely contacts the inner peripheral surface of 10B and elastically adheres to the outer peripheral surface of each pipe end across the two pipes 6 and 6, and as a sealing member, airtightness or liquid tightness between the two pipes 6 and 6. Secure the sex.
After further connection, the fluid passing through both pipes 6 and 6 enters the pressure receiving space of the elastic packing 30 through the gap between the abutting portions of the pipe ends, and the pressure causes the elastic packing itself to bulge outward, The outer peripheral surface and the inner peripheral surface of the housing are in pressure contact with each other to further enhance the sealing property.

By the way, in this pipe joint, as shown in FIG. 8, the width dimension of the convex portion 11a (11b) of the housing 10A (10B) is larger than the groove width dimension of the annular grooves 61, 61 of the pipes 6, 6. Narrow,
A gap G due to the difference in width is provided between the two. The play due to the gap G improves workability during assembly. Further, by providing this play, there is an advantage that expansion and contraction of the pipes 6, 6 in the axial direction, misalignment and bending can be absorbed. However, if a gap G larger than necessary is provided as dimensional play, the following problems occur. That is, during use after piping, if load fluctuation due to fluid pressure in the pipe or some external force acts,
The pipes 6 and 6 move relative to each other in the axial direction of the pipe, and rotational forces act to cause misalignment, bending, and deformation such as bending. As a result, inconveniences such as deformation of the branch pipe and other members connected thereto and the action of force occur. In order to cope with such a problem, it is necessary to reinforce and support the important points of both pipes after the pipes with a supporting and fixing member, which is disadvantageous in terms of equipment cost due to labor and increase of parts.

Therefore, conventionally, the following proposals have been made in order to solve this problem. For example, in each of the joint surfaces of the pair of upper and lower housings, an inclined surface is provided on the housing on one side, and an inclined surface reverse to the inclined surface is provided on the joint surface of the housing on the other side. In this structure, the joint surface is inclined in the axial direction of the pipe (Japanese Patent Laid-Open No. 60-37492).
No.) and a pipe whose joint surface is inclined in the radial direction of the pipe (Japanese Patent Laid-Open No. Sho.
No. 63-167189), both of which move the housings of one and the other in the relative direction by aligning both slopes and utilizing the sliding between the slopes by tightening with bolts and nuts. Is. As a result, the convex portions of the housing are displaced from each other in the annular groove of the pipe in the direction of eliminating the gap, and the gap disappears, thereby eliminating the play and increasing the joint strength.

[0006]

However, in all of the above, the pair of housings are displaced or twisted in mutually opposite directions by utilizing the slip between one inclined surface and the other inclined surface. It was a structure that added a twist. Therefore, first, on the flange of the housing,
In addition, extra stress is applied to the fastening bolts, which is not preferable in terms of strength. Moreover, the problem is that the elastic packing also bends and twists at the same time. In other words, during use, a high fluid pressure always acts on this elastic packing, which leads to deterioration of the life and sealing performance of the elastic packing itself. Further, in the case where the housing is twisted, the housing comes into contact with one annular groove of the pipe at two points (two points). Therefore, if the pipe is filled with water and water pressure is applied, a tensile load is applied to the housing. There was a problem that the amount of extensional displacement of the pipe had to be suppressed at only two locations.

Therefore, the present invention solves the above-mentioned problems and does not apply irregular stress to the housing.
It is an object of the present invention to provide a housing-type pipe joint that can firmly and strongly fasten the pipe against axial extension and rotation, and as a result has a good elastic packing life and good sealing performance.

[0008]

SUMMARY OF THE INVENTION The present invention has a pair of semi-annular housings, each housing having a pair of engaging projections parallel to each other in the circumferential direction on both sides in the width direction. The flanges extending outward in the radial direction from both ends of the engaging projections are engaged with each other by flanges and bolts that are mating with each other. In a housing-type pipe joint that is fastened to connect the two pipes, with respect to the pair of engaging protrusions,
A housing type pipe joint is provided with one or more locking protrusions continuous in the circumferential direction on the inside thereof and a plurality of locking tabs on a part of the outside. The locking projection and the locking claw are preferably formed within the radial angle of 10 to 120 degrees in the annular portion of the semi-annular housing. The surface of the locking projection facing the annular groove side is an inclined surface, and the inclination angle can be 45 to 90 degrees from the horizontal plane.

Since the present invention is the above housing type pipe joint, in piping, first, an elastic packing is fitted to one pipe, and the other pipe is fitted with its central axes aligned, and the elastic packing is fitted. Attach it in place. After that, the engaging protrusions of the pair of housings are fitted and assembled in the annular grooves of both pipes in the vertical direction. At this time, the engaging projection and the claw are provided on the upper portion of the circular arc of the annular portion that does not hinder the initial fitting and assembly, so that the assembling workability is good.

Next, the flanges of the pair of housings are evenly tightened with the bolts at both ends. At this time, the locking projections firmly contact the side surface of the groove so as to fill the gap of the annular groove. If this portion is an inclined surface, it can easily enter the annular grooves of both pipes, and the outer locking claw portion can perform a wedge action of digging into the annular groove side surface. In this way, the pair of housings and the elastic packing are firmly fastened without being subjected to a stress such as a twist.

After that, when fluid pressure is applied to the inside of the pipe, the two pipes tend to extend outward in the axial direction, but the locking projection is firmly formed by the wedge action as a continuous surface inside the annular groove. Since it is locked, movement of the tube in the axial direction is suppressed and deformation of the elastic packing is small. Further, even if a rotational force is applied to the pipe, the locking claw portion is embedded in the side surface of the annular groove, so that it is strong against misalignment and rotation.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a top view showing the inside of one housing. The other housing is a pair and both have the same structure. 2 is a sectional side view of the housing taken along the line AA, and FIG. 3 is a side view of the housing taken along the line BB. FIG. 4 is a partial cross-sectional view showing a state in which pipes are connected (elastic packing is not shown). FIG. 5 is an assembled side view of this housing type pipe joint.

As shown in FIGS. 1 to 5, a housing type pipe joint 1 has a pair of vertically symmetrical, semi-annular, ductile casting housings 2 and 2, each housing 2 having a curved annular portion. An annular elastic packing 3 (not shown) made of rubber or the like is mounted along the inner peripheral surface of the annular portion 21. On both sides of the annular portion 21, there are engaging protrusions 2 along the peripheral edge.
2, 22 are formed. Further, flanges 23, 23 are provided so as to project at both ends of the engaging convex portion 22 on both sides in the radial direction of the annular portion 21, and the bolt 4 can be inserted into the flange 23 with play so that workability is improved. In consideration of the above, long bolt holes 24, 24 are provided. These two flanges 23,
The 23 is tied to both flanges 22 and 23 of the housing 2 on the other side, and is fastened by the bolt 4 and the nut 5 as shown in FIG. Here, as shown in FIG. 4, the engagement protrusions 22, 22 provided in parallel on both sides of the annular portion 21 are annular grooves formed on the outer periphery of the ends of the two pipes 6, 6 to be connected. It is engaged in 61,61. Each groove width dimension of the annular grooves 61, 61 is larger than the width dimension of the engaging convex portion 22, and a gap G is provided due to a difference in width between the both. This gap G is defined by the two tubes 6,
It is provided as a play for facilitating the mounting of the pair of housings 2, 2 with respect to 6. The annular grooves 61, 61 are machined on-site with a dedicated tool using a roller having a size such that a gap G is generated.

Inside the engaging protrusions 22, 22, there are provided protrusions 25, 25 for engagement that are continuous in the circumferential direction in a part of the annular portion, and the protrusions 25 are sandwiched between the engaging protrusions. , 25, three locking claws 26, 26 are provided at predetermined positions at predetermined intervals in this embodiment. The locking projections 25, 25 and the locking claws 26, 26 are both provided at positions corresponding to the arcuate upper portion of the annular portion 21, and α distributed radially from the center to the left and right is provided.
Protrusion 2 over a range of 10-140 degrees, preferably 90 degrees
5 and 25 are formed continuously, and claw portions 26 and 26 are formed at equal intervals. Although the protrusion 25 is provided at one location in the present embodiment along the circumferential direction of the annular portion of the housing, it may be provided at a plurality of locations within the above angle. However, particularly when these are provided at the upper portion of the annular portion 21 at the angle α of 10 to 140 degrees, when the engaging convex portion 22 is fitted into the annular groove 61 of the pipe 6 for assembly, the engaging convex portion is the lower portion of the housing. Since it begins to be fitted into the annular groove 61 from the portion corresponding to it, it does not hinder the assembly. Further, the length of the bolt 4 to be fastened is limited, and the bolt 4 has bolt holes 24, 2 in the upper and lower housings 2, 2.
In order for the nut 5 to be hooked on the threaded portion protruding through 4, the α is preferably about 140 degrees at the maximum. When α is 10 degrees or less, the annular groove of the locking projection 25 and the locking tab 26 is
The contact with 61 is small and its effect is not sufficient.

The surface of the locking projections 25, 25 facing the annular groove 61 can be an inclined surface, and the inclination angle β is about 45 to 90 degrees, preferably about 70 degrees. At this time 45
If the inclined surface is close to the degree, it is convenient because the initial insertion into the annular groove 61 is easy and the assembling is good, and finally the gap G is filled so as to fill the gap G. On the other hand, when the angle is close to 90 degrees, the surface of the protrusion 25 contacts the side surface of the annular groove 61 over a wide area, which is desirable in that the amount of movement is small and the amount of extension of the tube is suppressed.

Next, an example of an assembling procedure of the housing type pipe joint of this embodiment will be described. First, the elastic packing 3 (not shown) is fitted to one of the pipes 6 and 6 in which the annular grooves 61 and 61 are formed, the other pipe 6 is drawn, and the ends of the pipes are aligned with each other with their axes substantially aligned. Then, the elastic packing 3 is attached to the outer peripheral surfaces of both pipes so as to extend over both pipe ends. Then, the pair of housings 2 and 2 are assembled from above and below so as to hold the elastic packing 3 inside,
At the same time, the engaging projections 22, 22 on both sides of each housing 2 are fitted into the annular grooves 61, 61 of both tubes. At this time, the engaging protrusions 22, 22
Since there is initially a play due to the gap G between the annular groove 61 and the annular groove 61, the assembly is smooth, and when the two housings are brought closer to each other, the engaging convex portion of the upper portion of the annular portion 21 is fitted into the groove 61. However, here as well as the locking projection 25, the locking tab 26
As shown in FIG. 4, the locking projections 25 are fitted by making a surface contact in the circumferential direction so as to fill the inner clearance, and the locking claws 26 are fitted by making point contact with each other. .

Thereafter, as shown in FIG. 5, the bolts 4 and 4 and the nuts 5 and 5 are passed through the elongated holes 24, and both ends are evenly screwed and tightened. Then, the locking projection 25 strongly abuts the inner wall of the annular groove 61 due to the wedge action as well as the tightening, while the locking claw 26 strongly digs into the outer wall of the annular groove 61. Therefore, there is no play or rattling due to the gap G in the annular grooves 61, 61, and the two pipes 6, 6 can be firmly connected. Further, the elastic packing 3 is brought into proper contact with the outer peripheral surfaces of the end portions of the tubes 6 and 6 without being twisted such as bent or twisted, and a good sealing property is obtained.

[0018]

As described above, according to the present invention, the housing and the bolt are not subjected to anomalous stress such as bending and twisting, and the strength is stable. Further, even when the pipe is filled with water and water pressure is applied, and the tensile load is applied to the housing, the extension of the pipe is suppressed by the function of the locking projection that is in surface contact in the circumferential direction. The stop claw portion exerts a strong resistance to the rotational force of the pipe. These have made it possible to fasten the tubes firmly. In addition, the elastic packing is not subjected to torsional stress, and is subjected to uniform compressive stress perpendicular to the pipe axis direction. This makes the housing type pipe joint highly reliable with a long life and sealability of the elastic packing.

[Brief description of drawings]

FIG. 1 is a top view showing the inside of a housing, showing an embodiment of the housing type pipe joint of the present invention.

FIG. 2 is a sectional view of the housing taken along the line AA.

FIG. 3 is a side view of the housing taken along the arrow BB.

FIG. 4 is a partial cross-sectional view showing a state in which pipes are connected.

FIG. 5 is an assembled side view of the housing type pipe joint.

FIG. 6 is a front half sectional view showing an example of a conventional housing type pipe joint.

FIG. 7 is a side half sectional view of FIG.

FIG. 8 is an enlarged sectional view of an essential part showing a state where pipes are connected.

[Explanation of symbols]

1 ... Housing type pipe fitting 2 ... Housing 3 ... Elastic packing 4 ... Bolt 5 ... Nut 6 ... Connected pipe 21 ... Annular part 22 ... Engaging projection 23 ... Flange part 24 ... Long hole 25 ... Locking projection 26 … Claws for locking 61… Annular groove

Claims (3)

[Claims] 1. A pair of semi-annular housings, each housing having a pair of engaging protrusions parallel to each other in the circumferential direction on both sides in the width direction, and two pipes connecting the engaging protrusions. While engaging over the annular groove provided in the vicinity of each connection end face, flanges extending outward in the radial direction from both ends of the engaging convex portion are fastened to each other by flanges of the mating flanges to form the two pipes. In the housing-type pipe joint to be connected, with respect to the pair of engaging projections, locking projections that are continuous in the circumferential direction are provided inside at one or more locations, and a plurality of engagement projections are provided at a part of the outside. A housing type pipe joint characterized in that a stop tab is provided. 2. The housing type according to claim 1, wherein the locking projection and the locking claw are formed within an emission angle of 10 to 140 degrees in the annular part of the semi-annular housing. Pipe fittings. 3. The surface of the locking projection facing the annular groove is an inclined surface, and the inclination angle is 45 to 90 from the horizontal plane.
The housing type pipe joint according to claim 1, wherein the housing type pipe joint is in degrees.