JPH09280435A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint easy to use. SOLUTION: On the intermediate part of a joint main body 1 in which a first external thread 2 to be screwed to the equipment is provided on one end and an inserting cylindrical part 4 to be engaged with the inside of a pipe to be connected 3 is provided on the other end, a second external thread 7 to which a fastening nut 6 is to be screwed and a fitting wall 8 for surrounding the base part of the inserting cylindrical part 5 in the radial direction inward from the second external thread 7 and having the diameter gradually extended in the free end direction of the inserting cylindrical part 4 are provided. A presser ring 9 to be brought in pressure-contact with the fitting wall 8 and whose diameter can be decreased is arranged outside the inserting cylindrical part 4. A projecting edge 11 is provided on the inner peripheral edge of the presser ring 9, a receiving groove 12 with which this projecting edge 11 is to be engaged through the pipe to be connected 3 is provided on the outer peripheral surface of the inserting cylindrical part 4, and a pressing wall 14 facing the fitting wall 8 and for pinching the presser ring 9 is provided on the inner peripheral surface of the fastening nut 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for connecting a thin-walled pipe, such as a copper pipe, a polyethylene pipe, or a stainless pipe, which constitutes a fluid pipe, to a device.

[0002]

2. Description of the Related Art A first male screw to be screwed to a device is provided at one end, and a tightening nut is screwed to a second male screw provided at an intermediate portion to connect a pipe to be connected mainly to a joint. There is a structure, and in this structure, a rubber O-ring is used for preventing leakage and a metal ring is used for preventing disconnection.

[0003]

In the prior art, a rubber O-ring is used to prevent fluid leakage. However, since the O-ring is made of rubber, it tends to change with time, so that the O-ring is deteriorated and has a leak prevention function. In addition to being damaged, the metal ring is used separately from the O-ring to prevent the ring from coming off, so that the number of members is increased and the handling is complicated.

[0004] The present invention has been devised, for example, by focusing on such a conventional example, and providing a pipe joint which avoids the conventional disadvantages by using a single ring.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] A first male screw to be screwed into a device is attached to one end, and a tightening is provided to an intermediate portion mainly composed of a joint, which is provided with an insertion cylinder portion which engages with the inside of a connected pipe at the other end. A second male screw into which the nut is screwed and a fitting wall that is radially inward of the second male screw, surrounds the base of the insertion cylinder, and gradually expands in the free end direction of the insertion cylinder. A pressing ring which can be reduced in diameter and is brought into pressure contact with a fitting wall is arranged outside the insertion tube portion, and a projecting edge is provided on an inner peripheral edge of the pressing ring, and the projecting edge engages through the connected pipe. The receiving groove is formed in the outer peripheral surface of the insertion cylinder portion, and the pressing wall that opposes the fitting wall and presses the pressing ring is provided on the inner peripheral surface of the tightening nut.

[0006]

[Function] The pressing ring is pressed against the pressing wall of the tightening nut, and the pressing ring presses against the fitting wall to reduce the diameter. The holding ring does not return to its original state due to the presence of the fitting wall, the connected pipe is held between the projecting edge and the receiving groove, and fluid leakage is prevented even if the tightening nut is loosened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show one embodiment of the pipe joint according to the present invention. FIG. 1 is a partially cutaway front view and FIG. 2 is a partially cutaway exploded front view of the essential parts of the present invention.

Reference numeral 1 denotes a first male screw 2 which is screwed to the device a at one end.
At the other end to the inside of the connected tube 3
In the joint main body provided with a square, a rectangular cylindrical tool engaging portion 5 is provided at an intermediate portion of the joint main body 1 adjacent to the first male screw 2, and the tool engaging portion 5 and the insertion cylindrical portion 4 are provided. A second male screw 7 for screwing the tightening nut 6 is provided between them.

The second male screw 7 has a diameter larger than that of the insertion cylindrical portion 4, and the second male screw 7 is provided on the insertion cylindrical portion 4 side, that is, inside the second male screw 7 in the radial direction. Insertion tube 4
A slightly funnel-shaped fitting wall 8 which encloses the base portion of the insertion tube portion 4 and expands in the direction of the free end of the insertion tube portion 4, and a presser ring 9 which can be reduced in diameter and comes into pressure contact with the fitting wall 8 is provided in the insertion tube portion. It is arranged on the outer side of 4 so as to surround the insertion tube portion 4.

As shown in FIG. 2, the presser ring 9 is provided with an inclined slit 10 so as to intersect the axis so that the diameter can be reduced. By making the slit 10 inclined, the fluid leakage can be surely prevented. It will be done in.

Further, a projecting edge 11 is provided on the inner peripheral edge of the pressing ring 9 on the free end side of the insertion tube portion 4 over the entire inner peripheral edge, and the projecting edge 11 is engaged via the connected pipe 3. A matching receiving groove 12 is provided on the outer peripheral surface of the intermediate portion of the insertion tube portion 4.

The tightening nut 6 has a female screw 13 which is screwed into the second male screw 7 on one end side, and has an inner diameter on the other end side slightly larger than that of the pipe 3 to be connected. At the intermediate portion adjacent to the female screw 13, a pressing wall 14 having a diameter gradually increasing in the direction of the female screw 13 from one end to the other end.
Is provided.

Then, the joint body 1 is screwed and assembled to the device a with the first male screw 2, and the connected pipe 3 is assembled to the joint body 1 so that the insertion tube portion 4 is engaged with the inside of the connected pipe 3. The holding ring 9 and the tightening nut 6 assembled to the connected pipe 3 so that the connected pipe 3 is inserted are moved to a position surrounding the insertion tube portion 4, and the female screw 13 is moved to the second male screw 7. When the tightening nut 6 is tightened by screwing with, the pressing ring 9 is pressed by the pressing wall 14 of the nut 6, moves along the pipe 3 to be connected, and is fitted into the fitting wall 8 to be elastically deformed. The diameter is reduced, and the projecting edge 11 is fitted into the receiving groove 12 via the connected pipe 3, and the connected pipe 3 is connected to the device a via the joint A of the embodiment.

The joint body 1, the tightening nut 6 and the holding ring 9 are made of brass, but stainless steel may be used as the material.

[0015]

The present invention has the configuration described above,
The protruding rim fits into the receiving groove, and as a result, the presser ring makes the connected pipe surely close to the insertion tube portion, can reliably prevent fluid leakage, and even if the tightening nut is loosened,
The presser ring is prevented from returning to the original state by being in close contact with the fitting wall, so that the fitting state of the protruding edge into the receiving groove is reliably maintained, and therefore, the pipe is free from fluid leakage and easy to use. Can provide a joint.

Incidentally, the present invention relates to a copper pipe, a polyethylene pipe,
Applicable to most thin-walled tubes such as stainless steel tubes.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view.

FIG. 2 is a partially cutaway exploded front view of a main component of the present invention.

[Explanation of symbols]

 1 Joint main body 2 First male screw 3 Connected pipe 4 Insertion cylinder part 6 Tightening nut 7 Second male screw 8 Fitting wall 9 Holding ring 11 Projection edge 12 Receiving groove 14 Pressing wall

Claims (1)

[Claims] 1. A tightening nut is screwed to an intermediate portion of a joint main body in which a first male screw threaded to a device is attached to one end, and an insertion tube section engaged to the inside of a pipe to be connected is attached to the other end. And a fitting wall that is radially inward of the second male screw and that surrounds the base of the insertion tube and that gradually expands in diameter toward the free end of the insertion tube. A pressure-reducible presser ring that comes into pressure contact is disposed outside the insertion tube portion, and a projecting edge is provided on the inner peripheral edge of the presser ring, and the projecting edge engages with the receiving groove through the connected pipe. A pipe joint, which is provided on the inner peripheral surface of the tightening nut so as to be recessed on the outer peripheral surface of the insertion tube portion and to face the fitting wall to press the pressing ring.