JP2603703Y2 - Pipe fittings - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint most suitable for connecting pipes.

[0002]

2. Description of the Related Art Conventionally, as a pipe joint for connecting a metal pipe, a chuck mechanism for tightening and locking an outer peripheral surface of a pipe inserted into a joint main body is provided, and a tip mechanism or an outer peripheral surface of the pipe is provided therein. There is a known one provided with a resin packing that is in contact with and sealed.

[0003]

According to the above conventional pipe joint, since the pipe is sealed with a resin packing, the pipe is sealed when the fluid is at a high temperature or when the fluid is a chemical which deteriorates the packing. However, there is a problem that it may not be used as a pipe joint. The present invention has been made in view of the above circumstances, and provides a pipe joint that can be used even when a fluid is at a high temperature or a chemical.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention slides a sleeve having an inward flange formed on the outer periphery of the main cylinder from the pipe insertion side of the main cylinder. A lever that freely fits and slides the sleeve in the axial direction is provided, and a claw is provided between the main cylinder and the flange of the sleeve on the inner surface of the distal end of the fastening piece that resiliently moves in the centrifugal centrifugal direction. The formed collet chuck-shaped tightening body, and an annular pressing body that is pushed by the flange portion by the movement to the rear end side of the sleeve, moves to the rear end side, and presses the tip of the tightening piece in the centripetal direction. It is provided movably in the axial direction, and a spring is interposed between the main cylinder and the tightening body. Further, inside the main cylinder, the end of the pipe is sealed by contacting the tip of the inserted pipe. A metal sealing surface was formed.

[0005]

With the sleeve moved to the tip of the main cylinder, a pipe is inserted from the tip of the main cylinder, and the tip is brought into contact with a metal seal surface formed inside the main cylinder, and the lever is moved. When the sleeve is moved to the rear end side by operation, the pressing body moves in the same direction by the flange formed at the front end of the sleeve, and presses the front end of the tightening piece of the tightening body in the centripetal direction. As a result, claws formed on the inner surface of the distal end of the fastening piece bite into the outer peripheral surface of the pipe, and lock the pipe. Further, due to the movement of the pressing body accompanying the movement to the rear end side of the sleeve, the tightening body moves to the rear end side while locking the pipe against the elastic force of the spring. As a result, the pipe locked by the tightening body also moves in the same direction, and the end of the pipe that is in contact with the metal sealing surface inside the main cylinder is strongly pressed against the metal sealing surface, and the end surface is sealed. You.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. In the drawings, reference numeral 1 denotes a main cylindrical body. The main cylindrical body 1 has a socket 2 and an adapter 3 integrally formed by screws, a front end opening portion serving as a pipe insertion opening 4, and a rear end opening portion. A screw portion 5 is formed on the outer periphery.

Reference numeral 6 denotes a sleeve having an inward flange 7 formed at the distal end thereof, which is slidably fitted from the pipe insertion side of the main cylindrical body 1, that is, from the distal end side. The sleeve 6 is slid by rotating a lever 9 pivotally attached to the outer periphery of the main cylinder 1 with a bolt 8. This lever 9
Is to fix an eccentric disk 10 at the center of pivotal connection of the lever 9, and to lock a pin 12 provided at the tip of an intermediate lever 11 fitted to the eccentric disk 10 into a hole 13 provided in the sleeve 6. When the lever 9 is rotated, the sleeve 6 is slid by approximately the same amount as the amount of eccentricity of the eccentric disk 10. That is, the sleeve 6 is reciprocated by the cam means of the lever 9.

The tip of the main cylinder 1 and the flange 7 of the sleeve 6
And a collet chuck-like fastening body 14 that bites into the outer periphery of the pipe inserted into the main cylinder 1 and locks it.
A pressing body 15 for pressing the tightening body 14 in the centripetal direction is provided so as to be movable in the axial direction. In the fastening body 14,
It has a cylindrical body through which the pipe passes, and a fastening piece 17 which is divided into a plurality by a slit 16 and resilients in a centrifugal centrifugal direction is provided at a front end side, and an outward flange 1 is provided at a rear end.
Eight. Claws 19 are formed on the inner surface of the tip of the fastening piece 17 to bite into the outer peripheral surface of the pipe.

A large-diameter cylindrical portion 20 extends in the axial direction at the tip of the main cylindrical body 1.
Are fitted slidably. Reference numeral 21 denotes a spring interposed between the tightening body 14 and the distal end face 22 of the main cylindrical body 1 in the large-diameter cylindrical portion 20. The spring 21 has a function of returning the tightening body 14 in the distal direction. . Reference numeral 23 denotes a stop ring which resiliently engages with a circumferential groove 24 formed in the inner peripheral surface of the distal end of the large-diameter cylindrical portion 20 to prevent the flange portion 18 of the tightening body 14 from coming off. . Reference numeral 25 denotes a stop ring pushing-out opening formed on a circumferential groove 24 with which the stop ring 23 of the large-diameter cylindrical portion 20 is engaged. The opening 25 may be a hole as shown in FIG. 5 or a split groove as shown in FIG.

Further, the pressing body 15 for pressing the tightening body 14 in the centripetal direction is constituted by an annular body.
4 is formed with a tapered pressing surface 26 that abuts against the distal end of the tightening piece 17 and presses in the centripetal direction, and has a cylindrical portion 27 having an inner diameter into which a pipe can be inserted at the distal end side. This cylindrical portion 27 is formed by a flange portion 7 formed at the tip of the sleeve 6.
Are slidably fitted in the openings. Reference numeral 28 denotes a stop ring for preventing the pressing body 15 from dropping into the sleeve 6.

Reference numeral 29 denotes a metal sealing surface formed inside the main cylinder 1, which is formed inside the adapter 3 in this embodiment. The metal sealing surface 29 abuts on the tip of the pipe inserted into the main cylinder 1 to seal the end face of the pipe, and is formed in a tapered shape.

Next, the operation of the above embodiment will be described. Figure 1,
FIG. 2 shows a connection standby state of the pipe 30, in which the lever 9 is in an upright state, the sleeve 6 is slid in the distal direction by the cam means of the lever 9, and the pressing body 15 is also located in the distal direction. ing. Further, the fastening body 14 includes a spring 21.
Is located at the tip side of the large-diameter cylindrical portion 20 due to the elasticity of
The tightening piece 17 is released from the pressing of the pressing body 15 and does not hinder the insertion of the pipe 30. The pipe 30 is connected by inserting the pipe 30 from the front end side of the main cylinder 1 in the above state until the front end of the pipe 30 contacts the metal seal surface 29 formed inside the main cylinder 1.

Thereafter, as shown in FIGS. 3 and 4, the lever 9 is rotated. Then, the sleeve 6 slides toward the rear end by the cam means of the lever 9. By the sliding in the rear end direction of the sleeve 6, the pressing body 15 is pushed by the flange portion 7 formed on the sleeve 6 and moves in the same direction, and the pressing surface 26 formed in a tapered shape tightens the tightening body 14. It comes into contact with the tip of the attachment 17 and presses it. At this time, since the retraction of the tightening body 14 is prevented by the elastic force of the spring 21, the distal end of the tightening piece 17 is pressed in the centripetal direction by the pressing surface 26 of the pressing body 15, and the inner surface of the distal end of the tightening piece 17. The claw 19 formed in the hole 30 bites into the outer periphery of the pipe 30 and is locked.

When the force caused by the movement of the pressing body 15 toward the rear end exceeds the elastic force of the spring 21, the spring 21 is compressed, and the tightening body 14 also moves toward the rear end. At this time,
Since the tightening body 14 locks the pipe 30, the pipe 30 moves in the same direction as the tightening body 14 moves, whereby the pipe 30 that is in contact with the metal seal surface 29 in the main cylindrical body 1. Is pressed against the metal sealing surface 29 and pressed to seal the end surface. At this time, the metal sealing surface 2
9 is tapered, so that the metal sealing surface 29
And the end face of the pipe 30 increases, and a more complete sealing state can be obtained. This completes the connection of the pipe 30.

If the pressing force of the pressing body 15 against the tightening piece 17 of the tightening body 14 or the pressing force of the pipe 30 against the metal sealing surface 29 is more than necessary, the spring 2
1 absorbs these forces, and no excessive force is applied, so that deformation and breakage of the pipe 30 are prevented.

When the pipe 30 connected in this manner is detached, the lever 9 is turned upright and the pipe 30 is released from the lock by the tightening body 14 when the lever 30 is brought into the state shown in FIGS. Then, the pipe 30 may be extracted in this state. In the maintenance or the like of the above-described embodiment, the large-diameter cylindrical portion 2 in which the fastening body 14 and the spring 21 are fitted.
An opening 25 that pushes the stop ring 23 out of the circumferential groove 24 onto the circumferential groove 24 with which the stop ring 23 engages.
Is formed, the stop ring 23 is inserted into the circumferential groove 2.
4 can be easily removed, and the fastening body 14 and the spring 21 can be easily replaced. Further, since the metal seal surface 29 that contacts the tip of the pipe 30 is formed on the adapter 3 side, even if the metal seal surface 29 is damaged,
Can be replaced or repaired easily and at low cost.

Next, an example of use of the pipe joint according to the present invention will be described. As a matter of course, it can be used as a normal pipe joint, and also as a pipe joint for a pressure test of pipes such as refrigerators and air conditioners. , And can also be used as a sealing stopper. When used as a pipe joint for a pressure resistance test, an air pipe is screwed into the screw portion 5 at the rear end of the main cylinder 1. When used as a sealing stopper, a lid is screwed onto the screw portion 5.

[0018]

As described above, according to the present invention, a metal sealing surface is formed inside the main cylindrical body, and the end of the inserted pipe is pressed against the metal sealing surface to seal the end surface. It is possible to obtain a pipe joint which is not affected by high temperature and chemicals, without the necessity of packing made of stainless steel, and is extremely convenient as a pipe joint particularly when the fluid is high temperature or chemical.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along line AA of FIG.

FIG. 3 is a side view showing a state where a pipe is connected.

FIG. 4 is a partial cross-sectional view taken along line BB of FIG. 3;

FIG. 5 is a partially enlarged view of FIG. 1;

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a partially enlarged sectional view showing an example of another embodiment.

FIG. 8 is a plan view of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main cylinder 6 Sleeve 7 Flange 9 Lever 14 Tightening body 15 Pressing body 17 Tightening piece 19 Claw 21 Spring 29 Metal seal surface 30 Pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 37/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A sleeve having an inward flange formed at an end thereof on an outer periphery of a main cylinder is slidably fitted from a pipe insertion side of the main cylinder, and the sleeve is slid in an axial direction. A collet chuck-like fastening body having a lever provided between the main cylindrical body and the flange of the sleeve and having a claw formed on an inner surface of a distal end of a fastening piece resilient in a centrifugal centrifugal direction; and a rear end of the sleeve. An annular pressing body which is pushed by the flange portion by the movement toward the rear side and moves to the rear end side and presses the tip of the tightening piece in the centripetal direction is provided movably in the axial direction, and tightens with the main cylinder. A pipe joint in which a spring is interposed between the main body and a metal sealing surface for abutting against the tip of the inserted pipe to seal the end face of the pipe inside the main cylindrical body.