JP2001099376A - Socket type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a socket type pipe joint allowing easy and sure connecting work, even in a narrow working space such as the inside of an instrument. SOLUTION: On a female pipe 2 side, a piping connection fitting 10 is mounted in advance. By pushing a male pipe 1 formed into a tapered shape at an end part into the fitting 10, the male pipe 1 advances, widening the piping connection fitting 10. By engaging the piping connection fitting 10 to the male pipe 1, the male pipe 1 and the female pipe 2 are connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bayonet type pipe joint suitable for connecting two pipes, particularly for connecting different diameter pipes.

[0002]

2. Description of the Related Art Conventionally, many means have been devised for a pipe joint for connecting two pipes. For example, as shown in FIG. 7, when two pipes a and b are connected, a concave metal fitting c having an open pipe a is fixed to an end of one pipe b, and an end of the other pipe a. A spacer f having a smaller diameter than the concave metal fitting c is fixed to the portion.

[0003] A support flange d is provided at the base of the spacer f.
A fixed groove g formed over the entire circumference is provided on the distal end side of the spacer f, and an O-ring h is fitted in the fixed groove g. When the spacer f is inserted into the concave metal fitting c,
When the O-ring h comes into contact with the inner wall of the concave metal fitting c,
A support flange d formed at the open end of the spacer f abuts on the fixed flange e of the concave metal fitting c. A rectangular slot k at the center of the plate
In the pipe connection fitting j in which is bored, the supporting flange d of the spacer f and the fixed flange e of the recessed metal fitting c are fitted into the elongated hole k, and the pipe bent in an annular shape partially cut out in advance. Connecting fitting j is fitted to pipes a and b, and two pipes a and b
Connect.

[0004]

However, in the conventional pipe joint using the pipe connection fitting, since the pipe connection fitting is fitted after connecting the pipe, it is difficult to put a hand inside the narrow instrument. However, there is a problem that assembly work such as fastening work is difficult. The object of the present invention is
An object of the present invention is to provide a plug-in type pipe joint capable of performing connection work easily and reliably even in a narrow work space such as inside an instrument.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, a plug-in type pipe joint according to the present invention comprises one pipe formed into a male pipe, the other pipe formed into a female pipe, and the male pipe inserted into the female pipe. To join the two pipes,
By pre-mounting a pipe connection fitting rounded to the female pipe and inserting the male pipe into the hole of the pipe connection fitting and then inserting it into the female pipe, the assembly work is simplified and the assembly time can be shortened. This facilitates installation in a narrow place such as inside the device. The joint side end of the male pipe to be fitted has a tapered portion from an end surface having a diameter smaller than the hole diameter of the pipe connection fitting to a large diameter portion having a diameter larger than the hole diameter of the pipe connection fitting, so that the pipe at the time of assembly work is provided. Since the connection fitting is smoothly expanded, the pipe fitting operation can be facilitated. When the joint end of the male pipe to be fitted pushes and expands the pipe joint while passing through the hole of the pipe joint, by providing a shape at the joint end of the female pipe to prevent the pipe joint from retreating, The fitting operation of the pipe during the assembling operation can be further facilitated.
By projecting a locking claw to prevent retraction in the notch of the pipe connection fitting, when the pipe connection fitting is pushed out during assembly, a difference occurs in the spreading (deformation) direction and the direction in which the pipe connection fitting comes off. Can exert a reliable retaining function even when force is applied.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A pipe fitting is attached to a female pipe side in advance, and a male pipe having a tapered end is pushed in so that the male pipe moves forward while pushing and expanding the pipe fitting. The male pipe and the female pipe are connected by the connection fitting engaging with the male pipe.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
One embodiment of the present invention will be described with reference to FIGS. 1 and 2. This is a structure in which pipes 1 and 2 are connected to each other. The female fitting 2 is formed by attaching the concave metal fitting 3 to the tip of the pipe.

The tapered metal fitting 5 of the male pipe 1 has a tapered portion 6 having a small-diameter portion located at the tip end of the pipe, a flat portion 7 having an outer diameter equal to or smaller than the small-diameter portion following the tapered portion 6, and a flat portion. An annular groove 8 provided on the pipe tip side of the portion 7 and an inner hole communicating with the male pipe 1 are provided, and an O-ring 9 is fitted in the annular groove 8. The concave metal fitting 3 of the female pipe 2 has an inner hole 3a having a larger diameter than the small diameter portion of the tapered part 6 of the tapered metal fitting 5, and communicates with the female pipe 2. 4 are provided.

The pipe fitting 10 fitted into the locking groove 4 of the concave fitting 3 has two rectangular slots 10d formed substantially symmetrically with respect to the longitudinal center line. A spring portion 10a is formed by bending a central portion between the holes 10d into a substantially U-shape, and an arc-shaped portion 10 formed in an annular shape continuously from the spring portion 10a.
b is formed, and the lower ends of the arcuate portions 10b1 and 10b2 constituting the arcuate portion 10b are opened in a substantially inverted V-shape to guide the guide piece 10
c is formed. A gap 10e having a predetermined distance is formed at the base of the guide piece 10c.
Is pushed into the gap 10e, thereby forming the arc-shaped portions 1 on both sides.
Insert into the annular space between 0b1 and 10b2 and connect.

Here, the outer diameter of the tapered portion 6 of the tapered metal fitting 5 is smaller than the inner diameter of the annular space between the arcuate portions 10b1 and 10b2 (the inner diameter when not used) (the pipes 1 and 2).
The large diameter portion is formed on both sides of the arc-shaped portion 10b1,
It is formed larger than the inner diameter of the annular space between 10b2.

Next, the assembling work will be described.
First, one arc-shaped portion 10b2 of the pipe connection fitting 10 is fitted into the locking groove 4 of the concave fitting 3 of the female pipe 2, and the concave fitting 3 is formed.
Is fixed to the pipe connection fitting 10. The taper fitting 5 of the male pipe 1 is pushed into the pipe fitting 10, and the arc-shaped portion 10 b 1 of the pipe fitting 10 is expanded and fitted by the large diameter part of the taper fitting 5, and the large diameter part of the taper fitting 5 is fitted. Is fitted into the elongated hole 10d of the pipe connection fitting 10, and is locked and fixed to the arcuate portion 10b1.

In this embodiment, in the arc-shaped portion 10b of the pipe connection fitting 10, the curvature of one arc-shaped portion 10b1 is different from the curvature of the other arc-shaped portion 10b2. The radius of the arc-shaped portion 10b2 on the side previously mounted in the locking groove 4 of the metal fitting 3 is formed to be larger than the radius of the other arc-shaped portion 10b1. It is a matter of setting.

3 and 4, another embodiment will be described. In the structure for connecting the male pipe 21 and the female pipe 22, the end of the female pipe 22 is expanded to form a tapered expanded portion 22a, and the large-diameter portion is continuously connected to the large-diameter end of the expanded portion 22a. A tube portion 22b is formed, and the large-diameter tube portion 22b is formed.
A support flange 22c protruding outward is provided at an end of the support flange 22c. The annular flange 23 is fitted to the large-diameter pipe portion 22b while being engaged with the support flange 22c.

The male pipe 21 has a large-diameter portion 21a protruding in a strip shape at the end on the connection side, and a small-diameter portion 21 following the large-diameter portion 21a.
a and a flange portion 21 formed at an end of the small diameter portion 21a
c, and the taper member 24 is fitted.

The tapered member 24 has a large-diameter flat portion 24a, a tapered portion 24b continuing from the large-diameter side to the small-diameter side, and a small-diameter flat portion 24e having a smaller diameter than the tapered portion 24b.
And The large-diameter side edge 24c of the tapered portion 24b is formed to have a larger diameter than the large-diameter flat portion 24a,
e is formed to have a smaller diameter than the small-diameter side edge 24d of the tapered portion 24b, and the end of the small-diameter flat portion 24e and the male pipe 21 are formed.
O-ring 2 is attached to the small diameter portion 21c between the
5 is fitted.

The pipe fitting 26 is formed in an annular shape with a part cut away, and has a first locking hole 26a and a second locking hole 26b. The annular flange 23 fitted to the female pipe 22 is fitted into the first locking hole 26a, and the annular flange 23 engages with the hole wall of the first locking hole 26a, so that the pipe fitting 26 comes off. To prevent

Thereafter, as shown in FIG. 3, the end of the male pipe 21 passes through the hole of the pipe fitting 26, and
2, the O-ring 25 abuts against the inner wall of the large-diameter pipe portion 22b of the female pipe 22, and the large-diameter side edge 24c of the tapered portion 24b of the tapered member 24 is connected to the pipe connection fitting 26. , The pipe connection fitting 26 and the female pipe 22 are engaged, and the male pipe 21 and the female pipe 22 are connected.

The outer diameter of the annular flange 23 and the outer diameter of the large-diameter side edge 24c of the tapered portion 24b are larger than the inner diameter of the pipe fitting 26, respectively. The relative movement of the metal fitting 26 is suppressed and prevented.

Referring to FIGS. 5 and 6, an embodiment of the pipe fitting will be described. The pipe connection fitting 26 is formed by bending a plate material and forming an annular shape in which a part (for example, a lower part) is opened in an inverted V-shape, and has a substantially concave spring part 26d protruding outward at the center. Then, a spring portion 26d is formed, and a pair of arc-shaped portions are continuously formed on the legs of the spring portion 26d.
A long hole 260 is formed in each of the two arc-shaped portions so that the first arc-shaped portion 26 is formed.
e and a second arc-shaped portion 26f are formed, and the tip of the arc-shaped portion is folded back to spread in an inverted V-shape.
g is formed.

On both short sides of the long hole 260 of the arc-shaped portion, the locking claws 26c are projected, and the tips of the locking claws 26c are bent outward to form the large-diameter end of the tapered portion 24b of the tapered member 24. Engagement with the edge 24c and the annular flange 23 fitted to the female pipe 22 is ensured.

When fitting the pipe fitting 26 to the male pipe 21 and the female pipe 22, the pipe is pushed into the pipe fitting 26 from the folded portion 26 g of the pipe fitting 26, and the pipe fitting 26 is drawn by a dotted line 261. The male pipe 21 and the female pipe 22 are fitted by pushing and spreading as shown in FIG.

[0022]

Since the present invention is constructed as described above, it has the following effects. By pre-mounting a pipe connection fitting rounded to the female pipe and inserting the male pipe into the hole of the pipe connection fitting and then inserting it into the female pipe, the assembly work is simplified and the assembly time can be shortened. ,
Mounting in a narrow place such as the inside of the device becomes easy. The joint side end of the male pipe to be fitted has a tapered portion from an end surface having a diameter smaller than the hole diameter of the pipe connection fitting to a large diameter portion having a diameter larger than the hole diameter of the pipe connection fitting, so that the pipe at the time of assembly work is provided. Since the connection fitting is smoothly expanded, the pipe fitting operation can be facilitated. When the joint end of the male pipe to be fitted pushes and expands the pipe joint while passing through the hole of the pipe joint, by providing a shape at the joint end of the female pipe to prevent the pipe joint from retreating, The fitting operation of the pipe during the assembling operation can be further facilitated. By projecting a locking claw to prevent retraction in the notch of the pipe connection fitting, when the pipe connection fitting is pushed out during assembly, a difference occurs in the spreading (deformation) direction and the direction in which the pipe connection fitting comes off. Can exert a reliable retaining function even when force is applied.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a plug-in type pipe joint which is an embodiment of the present invention.

FIG. 2 is a perspective view of a pipe connection fitting according to the present invention.

FIG. 3 is a schematic structural view of a plug-in type pipe joint which is a different embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a male pipe according to the present invention.

FIG. 5 is a front view of another embodiment of the pipe connection fitting according to the present invention.

FIG. 6 is a side view of another embodiment of the pipe connection fitting according to the present invention.

FIG. 7 is a schematic configuration diagram of a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male pipe 2 Female pipe 3 Recessed metal fitting 4 Locking groove 5 Taper metal fitting 6 Taper part 7 Flat part 8 Annular groove 9 O-ring 10 Pipe connection metal fitting

Claims (4)

[Claims] 1. A structure in which one pipe is formed as a male pipe and the other pipe is formed as a female pipe, and the male pipe is inserted into the female pipe to join the two pipes, and the female pipe is rounded into a ring. A plug-in type pipe joint characterized in that a pipe connection fitting is mounted in advance, a male pipe is inserted into the pipe connection fitting, and then inserted into a female pipe. 2. A joint side end of a male pipe to be fitted has a tapered portion from an end face having a diameter smaller than the hole diameter of the pipe connection fitting to a large diameter portion having a diameter larger than the hole diameter of the pipe connection fitting. The plug-in type pipe joint according to claim 1, wherein 3. The joint end of the female pipe has a shape that prevents the pipe joint from retreating when the joint end of the male pipe to be fitted is pushed and spread while passing through the hole of the pipe joint. The plug-in type pipe joint according to claim 1, wherein the pipe joint is provided. 4. The plug-in type pipe joint according to claim 1, wherein a locking claw for preventing retreat is projected from a notch of the pipe connection fitting.