JPH0731032Y2 - Pipe joint with disconnection prevention function - Google Patents

Description

[Detailed Description of Device] a. The present invention relates to a pipe joint used for connecting fluid pipes to each other, and more particularly to a pipe joint having a disconnection preventing function.

[Conventional technology]

As a pipe joint of this type, Japanese Utility Model Publication No. 56-28392 is known.

That is, according to the known technique, a circumferential annular groove is provided on the inner surface of a central portion of a tubular metal joint body having an outer flange at one end to accommodate packing, and at the other end portion of the joint body. Forms a notch in the axial direction and provides a protrusion on the inner surface of the end, and a bolt is passed between opposite sides of the notch to tighten the bolt and nut to reduce the diameter of the end and connect the protrusion. The outer surface of the plastic pipe is made to bite, and a so-called tightening-type detachment prevention system is adopted.

However, according to the known technique, in order to effectively dig into the outer circumference of the pipe to which the projection is connected, it is necessary to increase the axial length of the cut in the tightened portion to ensure flexibility, Therefore, the length of the joint body also becomes large. This cut length is proportional to the pipe diameter, which not only increases the manufacturing cost, is uneconomical, but also limits the place of use.

[Problems to be solved by the invention]

In view of the above situation, the present invention aims to reduce the manufacturing cost by making the length of the tightening portion as small as possible in the pipe joint having this kind of tightening type separation prevention function and making the joint portion as a whole smaller. It is an object of the present invention to provide a flexible pipe joint structure.

B. Configuration of the Invention [Means for Solving the Problems] In order to achieve the above object, the pipe joint having the detachment prevention function of the present invention adopts the following configuration (technical means). That is, one end or both ends of the joint body 1 is formed with the bulging portion 3 for receiving the insertion portion of the fluid pipe P to be connected thereto and for accommodating the packing 4 which is watertight with the insertion portion. 3, a tightening portion 5 that radially reduces outward in the axial direction of the pipe.
In the fluid pipe joint, the tightening portion 5 is integrally and substantially semicircularly extended from the joint body 1, and a locking blade is formed along the inner peripheral surface. A semi-cylindrical portion 12; a tightening arc piece 13 which is separated from the joint body 1 and which occupies the other half circumferential portion of the semi-cylindrical portion and has a locking blade formed along the inner peripheral surface; And a fastening tool 14 for pulling the fastening arc piece and the fastening arc piece together in the radial direction;
It is characterized by consisting of.

[Action]

In the operation of connecting the connecting pipe P into the main pipe joint, the fastener 14
The half-cylindrical portion 12 and the tightening arc piece 13 are attracted to each other by the tightening action of, and the diameters of the half-cylindrical portion 12 cause the engaging blades 12a and 13a on the inner peripheral surfaces thereof to bite into the outer periphery of the connecting pipe P, so that the initial biting is performed. obtain.

When the connecting pipe P is displaced in the direction away from the main pipe joint, the engaging blades 12a and 13a further bite into the outer periphery of the connecting pipe P. This exerts a strong separation prevention force.

〔Example〕

An embodiment of a pipe joint having a detachment preventing function of the present invention will be described with reference to the drawings.

1 to 3 show a pipe joint of the embodiment.

In the figure, J is a pipe joint of this embodiment, and P is one fluid pipe connected to the pipe joint J.

This pipe joint J comprises a circular tubular main body 1, a flange portion 2 stretched outward at one end of the main body 1, and a bulge formed at the other end of the main body 1. The diametrical portion 3, a packing 4 accommodated in the bulging portion 3, and a tightening portion 5 extending outward in the pipe axis direction of the bulging portion 3 are included.

More specifically, the main body 1 has a substantially cylindrical shape, and the flange 2 stretched at one end of the main body 1 is provided with bolt insertion holes 2a at appropriate intervals in the circumferential direction. The flange 2 is extended with a collar portion 7 on the inner diameter side,
It serves as a stopper for the connecting pipe P.

A concave groove 8 for holding the heel portion of the packing 4 is formed along the inner circumference of the bulging portion 3, and the inner diameter is enlarged by connecting to the concave groove 8 to accommodate the valve portion of the packing 4. 9
Are formed, and the groove 8 and the recess 9 constitute a packing accommodating recess 10.

A lip piece 4a is formed at the tip of the valve portion of the packing 4 and exerts a self-sealing action by receiving fluid pressure.

The tightening portion 5 includes a semi-cylindrical semi-cylindrical portion 12 integrally extending from an end of the joint body 1 and the semi-cylindrical portion via a fluid pipe P.
Tightening arc piece 13 opposite to 12 and these semi-cylindrical parts 12
And a fastener 14 for fastening the fastening piece 13.

More specifically, the inner peripheral surface of the semi-cylindrical portion 12 has a locking blade 12 in the circumferential direction.
a is formed, and the inner diameter of the locking blade 12a is connected to the fluid pipe P
Is approximately equal to the outer diameter of the fluid pipe P
It is slightly larger than the outer diameter. Also, the semi-cylindrical part 12
At both ends in the circumferential direction of, flanges 15 are stretched outward,
The bolt hole 15a is opened.

The tightening arc piece 13 is opposed to the semi-cylindrical portion 12 through the fluid pipe P and has an arc shape, and an engaging blade 13a similar to the semi-cylindrical portion 12 is circumferentially formed on the inner peripheral surface thereof. ing. The locking blade 1
The inner diameter (curvature) of 3a is made slightly larger than the outer diameter of the fluid pipe P. Further, flanges 16 are stretched outward at both ends of the tightening arc piece 13 to form bolt insertion holes 16a.

A so-called tightening bolt is used for the fastener 14, and
The tightening arc piece 13 is strongly pressed toward the semi-cylindrical portion 12 by the screwing action of 14a and the screw hole 15a of the semi-cylindrical portion 12.

Although the example with the flange portion 2 is shown in the drawing, the flange portion 2 may be omitted and the right half portion may have the same configuration.

(Operation of Embodiment) The mounting procedure of the pipe joint J of this embodiment and the operation at the time of separation will be described.

Prior to connecting the fluid pipe P to the main pipe joint J, the fastening arc piece 13 is removed or the fastener 14 is loosened.

After that, the fluid pipe P is inserted into the main body 1 of the main pipe joint J.

In this case, even if the fluid pipe P is a pipe whose outer peripheral surface is coated with a synthetic resin layer, the coating layer is connected to the semi-cylindrical portion 12 of the main joint J and the locking blades 12a and 13a of the tightening arc piece 13. It does not damage the coating layer.

When the fluid pipe P reaches a predetermined position within the pipe joint J, the tightening arc piece 13 is arranged so as to face the fluid pipe P, and then the tightening tool 14 is provided.
To tighten the half-cylindrical portion 12 and the tightening arc piece 13.

After connection, the fluid in the fluid pipe P is the lip 4a of the packing 4.
It has a so-called self-sealing action and maintains a good water-stopping action.

The fluid pipe P is a joint J due to seismic force or ground subsidence.
The fluid pipe P receives the force in the direction to get out of the main pipe joint J
When further detached, the main pipe joint J has its locking blades 12a, 13a
Bites into the outside of the fluid pipe P, and exerts a separation preventing force.

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention.

C. Effect of the Invention According to the pipe joint having the detachment prevention function of the present invention, the axial length of the tightening portion that exerts the tightening function is shortened as much as possible, and as a result, the entire joint is downsized and the economical joint. Becomes

In addition, the shortening of the tightening portion reduces the size of the installation site, so that the installation work does not occur unexpectedly.

[Brief description of drawings]

The drawings show an embodiment of a pipe joint having a detachment preventing function of the present invention. Fig. 1 is a side view of the entire embodiment, Fig. 2 is a sectional view taken along the line II of Fig. 1, and Fig. 3 is a second view. It is the III-III sectional view taken on the line of FIG. P ... connecting fluid pipe, J ... pipe joint, 1 ... joint body, 3 ...
Expansion part, 4 ... Packing, 5 ... Tightening part, 12 ... Half cylinder part,
12a ... Locking blade, 13 ... Tightening arc piece, 13a ... Locking blade, 14 ... Fastener

Claims (1)

[Scope of utility model registration request] 1. A bulging portion (3) for receiving a spout portion of a fluid pipe P to be connected to one end or both ends of a joint body (1) and accommodating a packing (4) for ensuring watertightness with the spout portion. ) Is formed, and a tightening portion (5) that radially reduces in diameter is extended outward in the pipe axis direction of the bulging portion (3), the tightening portion (5) is A semi-cylindrical part (12) integrally and substantially half-circumferentially extended from the joint body (1) and having a locking blade formed along the inner peripheral surface; the joint body (1) And a tightening arc piece (13) which is separated from the other half of the semi-cylindrical portion and has a locking blade formed along the inner peripheral surface thereof; A pipe joint, characterized by comprising: a fastener (14) that pulls in the direction;