JPH10176773A - Pipe coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a product to reliably hold a pipe to be connected by a press ring and prevent the occurrence of leakage of liquid and have excellent facility. SOLUTION: Inner and outer cylinders 3 and 4 brought into a coaxial state are arranged on the other end side of a coupling main body 1 provided at one end with a first male screw joined in a screwed-in state with an apparatus (a). An engaging gap 7 in which a pipe 6 to be connected is inserted in a fitted-in state is provided between the inner and outer pipes 3 and 4. Further, a press ring 13 decreased in diameter through nipping of it between the outer cylinder 4 and a fastening nut 12 joined in a screwed-in state with the outer cylinder 4 is located between the fastening nut 12 and the inner cylinder 13.

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 copper pipe, a polyethylene pipe, a stainless steel pipe or the like constituting a fluid pipe to equipment.

[0002]

2. Description of the Related Art A first male screw 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 connection pipe to a main body of a joint. There is a structure, in which a rubber O-ring is used for preventing leakage and a metal ring is used for preventing coming off.

[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, a metal ring is used separately from the O-ring to prevent the metal ring from coming off, so that the number of parts is increased and the handling is complicated.

The present invention has been made by focusing on such a conventional example.

[0005]

Means for Solving the Problems An inner cylinder and an outer cylinder are provided coaxially with each other at the other end of a joint body provided with a first male screw screwed to a device at one end. An engaging gap is provided between the outer cylinder and the connection pipe for inserting the connected pipe, and a holding ring that is reduced in diameter by being clamped by the outer cylinder and a tightening nut screwed into the outer cylinder is provided with the tightening nut and the tightening nut. Basic means is to interpose between the inner cylinder.

[0006]

When the connection pipe is inserted into the engagement gap and the tightening nut is screwed into the outer cylinder and tightened, the diameter of the holding ring is reduced and the connection pipe is clamped.

[0007]

FIG. 1 is a partially cutaway front view, and FIG. 2 is a partially cutaway front view in use.

In the drawing, reference numeral 1 denotes a joint body provided at one end with a first male screw 2 screwed to a device a. The other end of the joint body 1 corresponding to the one end is coaxially arranged with each other. A cylinder 3 and an outer cylinder 4 surrounding the inner cylinder 3 are provided.
A square cylindrical tool engaging portion 5 is provided between the first male screw 2 and the first male screw 2.

A connected pipe 6 is provided between the outer cylinder 4 and the inner cylinder 3.
A second male screw 9 provided at the other end and the tool engaging portion 5 are provided with a window 8 radially overlapping a rear end portion of the engaging space 7. The outer end portion of the engagement gap 7 can be visually recognized from the outside through the window 8.

Inside the other end of the outer cylinder 4 where the second male screw 9 is provided, a fitting wall 10 whose diameter gradually increases in the direction of the free end of the outer cylinder 4 is provided. A pressing wall 11 whose diameter gradually increases in the direction of the fitting wall 10 is provided inside the tightening nut 12 so that the pressing nut 12 is screwed into the second male screw 9 of the outer cylinder. A holding ring 13 is interposed between the wall 11 and the fitting wall 10.

The holding ring 13 is provided with an inclined slit 14 so as to be crossed with the axis so that the diameter can be reduced. By making the slit 14 inclined, liquid leakage can be reliably prevented. is there.

The pressing ring 13 has a thicker end on one side of the outer cylinder 4 so that the thicker portion 13a is engaged between the fitting wall 10 and the pressing wall 11. One end side is thinned, and the thinned 13b side partially projects to the outside of the holding ring 13 through the holding ring 13 in a state where the connected pipe 6 is connected so that the colored b surface can be visually recognized. is there.

An inner peripheral edge of the holding ring 13 is provided with a protruding edge 15 over the entire area of the inner peripheral edge. In a connected state, the protruding edge 15 is opposed to the receiving groove 16 via the connected pipe 6.
Is provided on the inner cylinder 3 that protrudes from the outer cylinder 4 and overlaps the press ring 13 and the tightening nut 12 in the radial direction.

Thus, the joint main body 1 is screwed into the device a with the first male screw 2 and the inner tube 3 is inserted into the connected tube 6 so that the connected tube 6 is inserted between the inner and outer tubes 3 and 4. When the connection pipe 6 is pushed into the engagement gap 7, the terminal position of the connection pipe 6 can be visually recognized through the window 8, and it can be confirmed whether the connection pipe 6 is assembled at the correct position with respect to the joint main body 1.

Then, the holding ring 13 and the tightening nut 12 assembled so as to allow the connected pipe 6 to pass through the connected pipe 6 are moved to a position surrounding the inner cylinder 3, and the female screw 17 is moved to the second position. When the tightening nut 12 is screwed into the male screw 9 and the tightening nut 12 is tightened, the pressing ring 13
1 and moves along the connected pipe 6 and presses against the fitting wall 10 to be elastically deformed by being pressed by the fitting wall 10 and the pressing wall 11 to reduce the diameter (in this case, the inner diameter). The cylinder 3 receives the external force in the radial direction, and the diameter is smoothly reduced), the protruding edge 15 faces the receiving groove 16 via the connected pipe 6, and the connected pipe 6 is forcibly inserted into the receiving groove 16. The connected pipe 6 is connected to the device a via the joint A in the embodiment. In addition, whether or not this connection state is achieved depends on whether the presser ring 1 protruding outside the tightening nut 12.
3 is determined by the thin portion 13b (colored portion b).

Although the joint body 1, the tightening nut 12 and the press ring 13 are made of brass, other metal materials such as stainless steel may be used.

[0017]

The present invention has the configuration described above,
The connection pipe can be reliably held by the holding ring, and a liquid-leakable and easy-to-use product can be provided. Further, even if the tightening nut is loosened, the holding ring is in close contact with the fitting wall, so that it is possible to prevent liquid leakage due to the return to the original state.

Further, the presence of the protruding edge makes it possible to maintain the sealing surface pressure against the connected pipe, so that it is possible to provide a pipe joint with improved prevention of liquid leakage, and to connect the connected pipe by the presence of the window. It is possible to easily determine whether or not the state position is right or wrong.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view.

FIG. 2 is a partially cutaway front view in a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 2nd male screw 3 Inner cylinder 4 Outer cylinder 6 Connected pipe 7 Engagement gap 12 Tightening nut 13 Holding ring

Claims (3)

[Claims] An inner cylinder and an outer cylinder are provided coaxially with each other at one end of a joint body provided with a first male screw screwed to a device at one end. An engaging gap for inserting a connected pipe is provided therebetween, and a holding ring that is reduced in diameter by being pressed by the outer cylinder and a tightening nut screwed into the outer cylinder is provided between the tightening nut and the inner cylinder. To intervene,
Pipe fitting. 2. The pipe joint according to claim 1, wherein a protruding edge surrounding the connected pipe is provided on an inner peripheral edge of the holding ring. 3. The pipe joint according to claim 1, wherein a window is provided in the outer cylinder so as to overlap a deep end of the engagement gap.