JPH09303655A - Pipe joint with collet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock and fix a pipe with a collet stably by forming a collet inserted into a pipe joint main body, and provided with a head part which is brought into pressurizing contact with the taper inner surface of the pipe joint main body, a cylindrical wall whose diameter is contracted freely, and an edge bitten into the outer surface of a connected pipe, and arranging a female type locking recessed/projection on the inlet inner surface of the pipe joint main body. SOLUTION: In the case where pipings are connected to each other, a connected pipe p is inserted into a collet 2, the collet 2 is pulled, the head part 22 of the collet 2 is brought into pressurizing contact with the taper inner surface 12 of a pipe joint main body 1, the diameter of a cylindrical wall 21 is contracted, an edge 23 is bitten into the outer surface of the connected pipe p, and also the male type locking recessed/projection (b) is locked with the female locking recessed/projection (a) of the pipe joint main body 1. After connecting work is completed, pipe shaft direction component force is acted in a direction made the collet 2 apart from the pipe joint main body 1 when pulling of the collet 2 is released, a lock condition is held stably since the pipe shaft direction component force is supported at the lock position (ab) of the inlet inner surface of the pipe joint main body 1 and the collet 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint with a collet.

[0002]

2. Description of the Related Art Pipe fittings are required to have a predetermined pull-out strength, and various pipe fittings having a retaining mechanism have been proposed, and one of them is a collet-equipped fitting. , JP-A-6-193787). FIG. 5A shows a general structure of a pipe joint with a collet.

In FIG. 5A, reference numeral 1'denotes a pipe joint body, and an inner surface thereof is provided with a taper inner surface 12 'whose diameter decreases toward the inlet side. 3'is an O-ring mounted in the pipe joint body. 2'is a collet,
The connected pipe end has a tubular shape that is inserted toward the back of the pipe joint body 1 '. This collet 2'is a head 2 which is brought into pressure contact with the taper inner surface 12 'by pulling in the pulling direction.
2 ', a slit 24' for reducing the diameter of the cylindrical wall 21 'by its pressure contact, and a blade 23' that is bitten into the outer surface of the pipe to be connected due to the diameter reduction.

To connect a pipe with this pipe joint with collet, the end of the pipe to be connected is inserted into the collet while elastically expanding the slit, and then the outer flange of the collet is grasped and the collet is pulled in the pull-out direction. The head of the collet is brought into pressure contact with the taper inner surface of the pipe joint body. This pressure contact narrows the slit in the cylinder wall, reduces the diameter of the cylinder wall, and causes the blade to bite into the outer surface of the pipe to be connected.

[0005]

FIG. 5B shows the state when the collet 2'is pulled in the pulling-out direction to cause the blade 23 'to bite into the outer surface of the connected pipe p', and then the pulling is released. Shows the action state of the force, the bending reaction force f of the cylinder wall 21 'acts on the contact portion between the head portion 22' and the taper inner surface 12 ',
Pipe axial component force f'regulated by the gradient of the taper inner surface 12 '
Acts on the pipette body 1'in a direction pushing the collet 2'in the direction opposite to the pull-out direction.

Thus, even if the pipe p'is fixed to the pipe axial component force f'because of the O-ring 3'and other pipe fixing means, the blade 23 'is fixed to the outer surface of the pipe to be connected. When the bite depth is shallow, the collet 2'is moved in the e direction with respect to the pipe joint body 1'because of the pipe axial component force f ', and the engagement of the blade with the outer surface of the connected pipe is released. There is a fear. However, when the pipe to be connected is a metal pipe or a hard plastic pipe, it is difficult to make the depth of the blade bite into the outer surface of the pipe to be connected sufficiently deep, and when the pulling direction of the collet is released, the pipe to be connected to the blade is released. There is a fear that the collet cannot be effectively functioned because the bite lock on the outer surface is released.

An object of the present invention is to provide a pipe joint main body and a collet to be inserted into the pipe joint main body, and the pipe joint main body has a taper inner surface whose diameter is reduced toward an inlet side of the pipe joint main body. The end of the pipe to be connected has a cylindrical shape that is inserted toward the inside of the pipe joint body, and the head is pressed against the inner surface of the taper by pulling in the pulling direction, and the diameter is reduced by this pressure contact. In a pipe joint with a collet that has a cylindrical wall and a blade that is cut into the outer surface of the pipe to be connected due to the reduced diameter of this cylindrical wall, even if it is a metal pipe or hard plastic pipe that does not easily bite the blade deeply, The purpose of the present invention is to provide a pipe joint with a collet that can hold the locked state in a stable manner after the pipe is locked to the outer surface of the pipe to be connected.

[0008]

A pipe joint with a collet according to the present invention comprises a pipe joint main body and a collet to be inserted into the pipe joint main body, and the pipe joint main body has a smaller diameter toward the inlet side of the pipe joint main body. The collet has a cylindrical inner surface, and the end of the pipe to be connected is inserted into the pipe joint body toward the inner side. The collet is pressed against the inner surface of the taper by pulling in the pulling direction. It has a head portion, a cylindrical wall whose diameter is reduced by this pressure contact, and a blade which is bitten into the outer surface of the pipe to be connected due to the diameter reduction of this cylindrical wall. It is characterized in that a stop concavo-convex is provided, and a male-type concavo-convex for the female-type concavo-convex is provided on the collet.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a pipe joint with a collet according to the present invention. In FIG. 1, 1
Is a pipe joint main body, and has a taper inner surface 12 whose diameter decreases toward the main body inlet 11, and an O-ring mounting groove 13 is provided adjacent to the taper inner surface 12. .
Reference numeral a is a female locking concave and convex portion provided on the inner surface of the inlet of the pipe joint body 1, for example, a female thread groove.

Reference numeral 2 is a collet, and a head 22 is provided on the outer surface of the distal end of the cylindrical wall 21 so as to be in pressure contact with the inner surface 12 of the taper, and the cylindrical wall 21 can be reduced in diameter. Slits 24 are provided, and a blade 23 that is bite into the outer surface of the connected pipe is provided on the inner surface of the distal end of the cylindrical wall 21.
A flange 25 is provided at the rear end. This blade 23
When the blade edge of the blade is in contact with the outer surface of the pipe to be connected, for example, in a tangential direction, and four slits are provided on the cylindrical wall at an angle of 90 °, the contact state of the blade tip 23 with the outer surface of the pipe to be connected is shown in FIG. As shown. In FIG. 1, b is a male locking concave and convex provided on the outer surface of the front end portion of the collet 2 with respect to the female locking concave and convex a, for example, a male screw groove.

In order to connect the pipes with the pipe joint with the collet, the pipe to be connected is inserted into the collet 2, and then the collet 2 is pulled in the pulling-out direction so that the head 22 of the collet 2 is pulled as shown in FIG. The taper inner surface 12 of the pipe joint body 1 is brought into pressure contact with the tubular wall 2 by the radial component force generated at the contact portion.
1 is reduced in diameter, the blade 23 is cut into the outer surface of the pipe p to be connected, and the collet 2
The male locking concave and convex b is locked. Thereafter, the pulling direction of the collet 2 is released, and the connection work is completed.

When the tension of the collet is released, the head 22 of the collet 2 and the taper inner surface 12 of the pipe joint body 1 are released.
The bending reaction force f of the cylindrical wall 21 of the collet 2 acts on the contact point with the collet 2, and the taper angle α of the taper inner surface 12 causes the component force f ′ in the pipe axial direction to move the collet 2 from the pipe joint body 1 to the pipe joint body 1. This component acts in the direction of separation and this pipe axial component force f'is supported at the locking portion ab between the inner surface of the inlet of the pipe joint body 1 and the collet 2.

Therefore, the collet 2 can be fixed to the component force f'in the axial direction of the pipe, and the 23 blades of the collet 2 generated when the collet 2 moves with respect to the pipe joint body 1 by this component force and the surface of the connected pipe p. The lock release with can be reliably eliminated, and collet 2
The locked state by the blade 23 can be stably maintained. In the above description, the female locking irregularities a on the inner surface of the inlet of the pipe joint body 1 and the male locking irregularities b on the outer surface of the front end of the collet 2 with respect to the locking irregularities a indicate the movement of the collet in the pulling direction. 4 can be smoothly carried out until it comes into contact with the inner surface of the inside of the taper, and the locking is carried out only for the movement in the opposite direction.
As shown in, the unevenness having directionality is very good.

In the pipe joint with collet according to the present invention, metal or hard plastic is used for the pipe joint body and the collet. If a hard plastic is used for the collet, the blade is embedded. In addition, in FIG.
Although only one connection port of the pipe joint is shown, the pipe joint according to the present invention may be a straight line or a branch joint, and at least one connection port may be included in the scope of the claims.

[0015]

In the pipe joint with collet according to the present invention, the bite of the collet can be maintained stably after the collet blade bites into the outer surface of the pipe to be connected. Even if the depth is shallow, the collet can hold the pipe with stable pull-out resistance by stably locking and fixing the pipe.

Therefore, the present invention is particularly useful for collet connection of metal pipes and hard plastic pipes.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a pipe joint with a collet according to the present invention.

FIG. 2 is an explanatory view showing a contact state of a cutting edge with an outer surface of a pipe to be connected in a pipe joint with a collet according to the present invention.

FIG. 3 is an explanatory view showing a usage state of the pipe joint with a collet according to the present invention.

FIG. 4 is an explanatory view showing another example of the female locking and recessing concavities and convexities in the colleted pipe joint according to the present invention.

FIG. 5 is an explanatory view showing a conventional pipe joint with collet and its usage state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe fitting main body 12 Taper inner surface a Female concave / convex 2 collet 21 Cylinder wall 22 Head 23 Blade 24 Slit b Male concave / convex for locking

Claims (1)

[Claims] 1. A pipe joint main body and a collet to be inserted into the pipe joint main body, the pipe joint main body having a taper inner surface whose diameter decreases toward the inlet side of the pipe joint main body, and the collet to be connected. A pipe whose end is inserted into the pipe fitting body toward the inner side, has a head that is pressed against the inner surface of the taper by pulling in the pulling direction, and a cylinder whose diameter is reduced by this pressure contact. The pipe has a wall and a blade that is cut into the outer surface of the pipe to be connected due to the reduced diameter of the tubular wall, and the female fitting concavity and convexity is provided on the inner surface of the inlet of the pipe joint body. A pipe fitting with a collet, characterized in that the collet is provided with male locking and recessing irregularities for the.