JPS6114782Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid pipe joint, and more particularly to a structure of a joint suitable for connecting medium-diameter fluid pipes and having a detachment prevention function.

In the past, various structures have been proposed in which mechanical joints are provided with a detachment prevention function (for example, the techniques of Japanese Utility Model Publication No. 45-7260, Japanese Utility Model Application Publication No. 51-39823, and Japanese Utility Model Application Publication No. 55-73691), (Technology disclosed in Utility Application No. 56-33451 previously filed by the present applicant), these have the advantages of mechanical joints such as ease of connection operation and no need to chamfer the insertion part, but on the other hand, they are difficult to prevent separation. There have been various problems, such as the mechanism (that is, the wedge piece, the wedge ring, the accommodation space for the wedge piece, and the pressing mechanism for the wedge piece) being complicated, and the mounting of the wedge ring requiring time and effort.

The present invention was developed in view of the above circumstances, and takes advantage of the advantages of mechanical joints while simplifying the configuration of the separation prevention mechanism, making it easier to install, and
The object of the present invention is to provide a joint that can obtain a larger detachment prevention force.

For this reason, the joint of the present invention has the following configuration. That is, a socket is formed at the end of the large-diameter pipe, and the packing is accommodated in the packing-accommodating recess of the socket. Insert the insertion part of the small diameter tube part into the socket part through the packing. A push ring that has been fitted into the socket in advance is brought into contact with the end face of the socket, and the inner surface of the push ring is provided with a washer ring engagement groove and a biting ring accommodating recess formed on a tapered surface connected to the washer ring engagement groove. do. The washer ring is engaged with the washer ring engagement groove and the packing is pressed. One half of the biting ring is accommodated in the biting ring accommodating recess. Tighten the socket and press ring using a fastener.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

Reference numeral 1 denotes a large-diameter pipe portion, and a socket portion 1A having a collar 11 and a packing-accommodating recess 12 is formed at the end of the large-diameter pipe portion 1. 13 is the end face of the socket; 1
4 is a bolt through hole bored in the collar 11.

Reference numeral 2 denotes a small-diameter tube portion, and an insertion port 2A at the end thereof is inserted into the socket portion 1A of the large-diameter tube portion 1. 2
Reference numeral 1 denotes the end face of the insertion port 2A, which is not chamfered.

3 is an annular packing accommodated in the packing accommodation recess 12 of the socket portion 1A, and a push ring (described later)
The large diameter pipe section 1 and the small diameter pipe section 2 are compressed by the pressing force, and the large diameter pipe section 1 and the small diameter pipe section 2 are sealed watertight.

Reference numeral 4 denotes an annular press ring, the inner diameter of which is slightly larger than the outer diameter of the insertion opening 2A of the small diameter tube, and can be freely fitted into the insertion opening. When viewed from a surface 41 (hereinafter referred to as "front surface") facing the socket end surface 13 of the push ring 4, a washer ring engagement groove 42 in which a washer ring (described later) engages is provided on the inner periphery, and a washer ring engagement groove 42 is connected to the engagement groove 42. A biting ring accommodating recess 43 is formed on the tapered surface into which a biting ring (described later) engages. 44 is the bolt through hole 14 of the collar 11 of the socket part.
This is a bolt through hole drilled in the press ring corresponding to the bolt. Although the press ring 4 is an annular integrally molded product in the illustrated embodiment, it may be molded in two pieces.

Note that the bolt through holes 14 and 44 are provided at two locations each in the illustrated embodiment, but they are provided at equal intervals on the circumference.
You are free to provide as many as you like.

Reference numeral 5 designates an annular washer ring that engages with the washer ring engagement groove 42 of the press ring 4 and presses the packing 3 at the joint's tightening setting position (FIG. 1). The washer ring 5 may be integrally molded into an annular shape, or may be provided with elasticity as a whole so that it can be engaged with the engagement groove 42 even with elasticity.

6 is an annular steel biting ring, and elasticity is imparted by one split. In its natural state, the outer diameter is larger than the diameter of the tapered surface of the biting ring housing recess 43 of the press ring 4, and the diameter is reduced by being pushed into the housing recess 43. As shown in FIG. 3, the biting ring 6 has a cutting edge portion 61 on the inside and a round shoulder portion 62 on the outside, and is installed with a slight inclination α° in the natural state.

Reference numeral 7 denotes a fastener, which consists of a bolt 71 and a nut 72, and is used to insert the bolt 711 into the bolt through hole 1 of the socket.
4 and the bolt through hole 44 of the push ring, and the push ring 4 is tightened by screwing in a nut 72.

Next, the function of each component of the present invention will be described in accordance with the joint installation procedure.

(1) Prior to inserting the socket part 2A into the socket part 1A, deposit the push ring 4, biting ring 6, washer ring 5, and packing 3 into the socket part 2A in this order. (2)
Insert the insertion port 2A into the socket 1A. (3) By pushing out the press ring 4, the bolt through holes 11 and 44 of the socket and the press ring are arranged oppositely, and the bolt 71 of the fastener 7 is inserted into the bolt through hole, and the nut 72 is attached. (4) By screwing in the nut 72, the push ring 4 moves forward to the socket 1A, and the washer ring 5 engages with the washer ring engagement groove 42 of the push ring, and the packing 3 is moved into the packing accommodation recess of the socket. Press and compress to 12. At the same time, the biting ring 6 collides with the tapered surface of the biting ring accommodating recess 43 of the press ring, and moves smoothly forward with a posture at an appropriate angle α. (5) The connection operation of the joint ends at the position where the front surface 41 of the press ring 4 collides with the end surface of the socket portion 1A. (6) Now, when the insertion part 2A moves in the withdrawal direction, the bite ring 6 is also pushed in the withdrawal direction, but since the round shoulder part 62 of the bite ring 6 is in contact with the tapered surface 43 of the press ring 4. Twisting rotation is caused using the collision part as a fulcrum,
The cutting edge part 62 stands in a biting manner on the outer surface of the socket part 2A, and prevents the socket part from coming off. At this time, since the biting ring 6 is made of one piece, it has elasticity, causes torsional deformation, and at the same time causes a diameter reduction action, thereby promoting biting force. Furthermore, even if the detachment progresses further to the extent that the biting ring 6 is reversed, the biting ring 6 abuts against the washer ring 5, and the reversal is prevented, thereby maintaining the detachment prevention force.

The present invention is not limited to the above-described configuration, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the present invention is not only used to connect pipes of different diameters, such as a large diameter pipe and a small diameter pipe, but also can be regarded as a large diameter pipe part 1 corresponding to the enlarged diameter part at the end of one fluid pipe. , which may also be regarded as corresponding to the sleeve shown in FIG.

Since the fluid pipe joint of the present invention has the above-mentioned configuration and functions, it has the following superior effects compared to conventional ones.

The separation prevention mechanism can be incorporated without complicating the shape of the press ring, and the press ring can be easily formed.

It is easy to attach the biting ring and washer ring during connection, and the connection operation does not require much effort.

The biting ring has elasticity and is in contact with the tapered surface and washer ring, so
The force of preventing the fluid pipe from being pulled out can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the joint of the present invention, FIG. 1 is a vertical sectional view of the main part of the joint of the present invention, and FIG.
FIG. 3 is an enlarged sectional view of a biting ring, and FIG. 4 is an embodiment in which the present invention is applied to a sleeve joint. 1...Large diameter pipe part, 1A...Socket part, 2...Small diameter pipe part, 2A...Socket part, 3...Packing, 4...
... Push ring, 5 ... Washer ring, 6 ... Biting ring, 7 ... Fastener.

Claims (1)

[Scope of utility model registration request] In a joint in which the insertion portion 2A of the small diameter tube portion 2 is inserted into the socket portion 1A at the end of the large diameter tube portion 1 via the packing 3, the insertion portion 2A is fitted into the insertion portion 2A, and the fastener 7
The press ring 4 to be tightened is brought into contact with and opposed to the end surface 13 of the socket portion 1A at the tightening setting position, and the press ring 4 is
A washer ring 5 that presses the packing 3 is engaged with a washer ring engagement groove 42 formed on the inner surface of the pressing ring, and a biting ring is formed on the inner surface of the press ring in a tapered manner and connected to the washer ring engagement groove 42. A fluid pipe joint characterized in that a one-piece biting ring 6 is accommodated in an accommodation recess 43.