JPH10115389A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint to be excellent in usability. SOLUTION: A second male screw 7 joined in a screwed-in state with a fastening nut 6 and a fitting-in wall 8 with which the base part of an insertion cylinder part 4 is surrounded and which is situated internally in the radial direction of the second male screw 7 and gradually increased in diameter in the direction of the free end of the insertion cylinder part 4 are arranged at the intermediate part of a joint main body 1 provided at one end with a first male screw 2 joined in a screwed-in state with an apparatus (a) and at the other end with the insertion cylinder part 4 engaged internally of a pipe 3 to be connected. Further, a expandable press ring 9 brought into pressure contact with a fit-in wall 8 is disposed external of the insertion cylinder part 4. A protrusion edge 11 to surround a pipe 3 to be connected is provided on the inner peripheral edge of the press ring 9 and a press wall 14 positioned opposite to the fitting-in wall 8 and nipping the press ring 9 therebetween is arranged on the inner peripheral surface of a fastening nut 6. Further, a display pin 16 energized in a protrusion direction by an elastic material 17 is retractably arranged at the deep end of the fitting-in wall 8. A window hole 18 through which the display pin 16 is visually observed is formed in the joint main body 1.

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, 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]

SUMMARY OF THE INVENTION A tightening nut is screwed into a joint body having a first male screw screwed to a device at one end and an insertion tube portion engaged with the inside of a connected pipe at the other end. A second male screw to be formed and a radially inner side of the second male screw, surrounding the base of the insertion tube, providing a fitting wall that gradually expands in the free end direction of the insertion tube. A pressing ring capable of being reduced in diameter is disposed outside the insertion tube portion, and a protruding edge surrounding the connected pipe is provided on an inner peripheral edge of the pressing ring, and the pressing ring is opposed to the fitting wall. Basically, a pressing wall for clamping the ring is provided on the inner peripheral surface of the tightening nut, and a display pin urged in a protruding direction by an elastic material is provided at the inner end of the fitting wall. It is suitable for use by adding a point where a window hole for viewing the display pin is provided mainly on the joints One in which the.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the pipe joint according to the present invention, FIG. 1 is a partially cutaway front view, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. FIG. 4 is an enlarged sectional view at the time of connection.

1 is a first male screw 2 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 larger diameter than the insertion cylinder 4, and the second male screw 7 is provided on the insertion cylinder 4 side, that is, radially inward from the second male screw 7. Insert tube 4
And a slightly funnel-shaped fitting wall 8 which gradually increases in diameter in the direction of the free end of the insertion tube portion 4, and is provided with a pressing ring 9 which can be reduced in diameter and presses against the fitting wall 8. 4, it is disposed so as to surround the insertion tube portion 4.

The press ring 9 is provided with an inclined slit 10 so as to cross the axis so that the diameter can be reduced. By making the slit 10 inclined, fluid leakage can be reliably prevented. is there.

[0010] A protruding edge 11 is provided on the inner peripheral edge of the press ring 9 on the free end side of the insertion tube portion 4 over the entire inner peripheral edge thereof. Receiving grooves 12 are formed in the outer peripheral surface of the intermediate portion of the insertion tube portion 4 by recess.

The tightening nut 6 has a female screw 13 screwed to the second male screw 7 on one end side, the inner diameter of the other end side is made slightly larger than that of the connected pipe 3, and an intermediate portion of the inner surface, ie, At an intermediate portion adjacent to the female screw 13, a pressing wall 14 that gradually increases in diameter toward the female screw 13 at one end from the other end.
Is provided.

A receiving hole 15 is provided at the back end of the fitting wall 8 along the axis of the joint body 1.
A display pin 16 is slidably fitted in the display 5 and an elastic material (in the embodiment, a coil spring, but may be rubber or a support piece) between the display pin 16 and the inner end of the receiving hole 15. The display pin 16 is urged in the projecting direction from the receiving hole 15 with the interposition of the display pin 17.

On the peripheral side of the receiving hole 15, that is, on the peripheral side between the second male screw 7 and the tool engaging portion 5 of the joint body 1, a window hole 18 communicating with the receiving hole 15 is provided. Receiving hole 1
The appearance state of the display pin 16 to and from the display pin 5 can be visually checked.

The display pin 16 of the embodiment is not located at the position of the window hole 18 when it protrudes from the receiving hole 15 due to the bias of the elastic member 17, and closes the window hole 18 when it is immersed. The size of the display pin 16 can be determined by changing the color of the peripheral side even if the size is such that the window hole 18 is always closed.

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 therein. When the connection tube 3 is pressed against the fitting wall 8, the end of the connected pipe 3 presses the display pin 16 against the bias of the elastic member 17,
The display pin 6 retreats toward the back end of the receiving hole 15 and the
Through this, it is possible to determine the appearance of the display pin 16, that is, the set state of the connected pipe 3 with respect to the joint body 1 (whether or not the pipe 3 is at the correct position).

Then, the retaining ring 9 and the tightening nut 6 assembled so as to allow the connected pipe 3 to pass through the connected pipe 3 are moved to a position surrounding the insertion tube portion 4, and the female screw 13 is moved. When the tightening nut 6 is tightened by being screwed to the second male screw 7, the press ring 9 is pressed by the pressing wall 14 of the nut 6, moves along the connected pipe 3, and is fitted to the fitting wall 8. Then, the protruding edge 11 is fitted into the receiving groove 12 via the connected pipe 3, and the connected pipe 3 is connected to the joint A of the embodiment.
Is connected to the device a through.

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

[0018]

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.

Obviously, by visually recognizing the display pin through the window hole, it can be confirmed whether or not the connected pipe is arranged at the correct position.

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 the drawings]

FIG. 1 is a partially cutaway front view.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a partially enlarged sectional view before connection.

FIG. 4 is a partially enlarged sectional view at the time of connection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 First male screw 3 Connected pipe 4 Insertion tube part 6 Tightening nut 7 Second male screw 8 Fitting wall 9 Pressing ring 11 Protrusion edge 12 Receiving groove 14 Press wall 16 Display pin 17 Elastic material

Claims (2)

[Claims] A first male screw screwed into a device at one end, and a second male screw into which a tightening nut is screwed into a joint body provided with an insertion tube at the other end engaged with the inside of a connected pipe. A fitting wall that is radially inward of the screw and the second male screw, surrounds the base of the insertion tube portion, and has a fitting wall that gradually increases in diameter toward the free end of the insertion tube portion, and is reduced in diameter in contact with the fitting wall. A possible holding ring is disposed outside the insertion tube portion, and a protruding edge surrounding the connected pipe is provided on an inner peripheral edge of the holding ring, and the holding ring is pressed against the fitting wall. A pipe joint having a pressing wall provided on an inner peripheral surface of the tightening nut. 2. The display device according to claim 1, wherein a display pin urged in a protruding direction by an elastic material is provided at a rear end of the fitting wall so that the display pin can be freely moved in and out. Pipe fitting as described.