JP2573557Y2 - 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 particularly excellent in pressure resistance.

[0002]

2. Description of the Related Art In a pipe joint, a seal member for hermetically sealing a space between a socket and a plug is generally mounted in the socket in order to prevent fluid leakage. In this sealing material, one configured to always seal the outer periphery of the inserted plug with a constant surface pressure, one configured to always seal the end surface of the plug with a constant surface pressure, There is a configuration using these together.

In order to ensure the integrity of the inserted plug, it is desirable to increase the surface pressure between the sealing material mounted in the socket and the sealing surface such as the outer peripheral surface or end surface of the inserted plug. When the surface pressure is increased, the connection work between the socket and the plug becomes difficult. For this reason, conventional pipe fittings are generally set so that the surface pressure between the sealing material and the sealing surface does not make the connection work between the socket and the plug difficult, and a sleeve is provided as a means to compensate for the insufficient surface pressure. A method is employed in which the end face sealing pressure of the plug is increased by using the component force of a biasing spring.

[0004]

According to the above conventional pipe joint, the surface pressure between the sealing material and the sealing surface cannot be increased in order to facilitate the connection work between the socket and the plug. When a high fluid pressure is applied, for example, when the sealing material is made of resin, the sealing material is deformed and the sealing is incomplete, and there is a problem that the fluid may be ejected from between the socket and the plug. Further, even if the component force of the spring that urges the sleeve is used, if the tension of the spring is increased, the operation of the sleeve itself becomes difficult, and a problem arises in that the connection operation between the socket and the plug becomes difficult. In view of the above, the present invention provides a pipe joint for solving the above problem by increasing the surface pressure between the sealing material and the sealing surface by a very simple operation.

[0005]

According to the present invention, a locking mechanism for connecting and fixing an inserted plug is provided around the outside of a plug insertion side end of a socket. In a pipe joint fitted with a sealing material that abuts on a seal end face of a plug and seals between a socket and a plug, a locking cylinder body provided with a locking mechanism at a distal end portion is provided around a tip outer periphery of a socket main cylinder body. An eccentric cam that presses the locking cylinder toward the rear end side through an operation cylinder by rotating, and an operation lever that rotates the eccentric cam. And the operation
By rotating the bar, the plug connected and fixed to the locking mechanism
And the locking cylinder that moves in conjunction with the operating cylinder.
And the socket is moved by the sealing end face of the plug.
A configuration is adopted in which the sealing member is pressed against the sealing member mounted inside the main body of the cutting unit . The pressing of the locking cylinder to the rear end by the eccentric cam is performed via a spring interposed between the operating cylinder and the locking cylinder.

[0006]

[Function] When the operating lever is rotated, the eccentric cam rotates,
The rotation of the eccentric cam retracts the operating cylinder, and the retracting operation cylinder presses the locking cylinder fitted to the outer periphery of the front end of the socket main cylinder in accordance with the amount of eccentricity of the eccentric cam. .
When connecting the socket and the plug, insert the plug into the socket in a state where the operation lever is turned to the left side in the drawing, that is, without pressing the locking cylinder with the eccentric cam, and the locking mechanism of the locking cylinder is used. After connecting and fixing the plug, turning the operating lever to the right in the figure and pressing the locking cylinder toward the rear end side, the plug fixed to the locking cylinder also receives pressure in the same direction and seals the plug. The end face presses against the sealing material in the main socket body. By performing the pressing of the locking cylinder by the eccentric cam via a spring, the locking cylinder is pressed toward the rear end by the repulsive force of the spring compressed in the thrust direction by the eccentric cam, thereby pressing against the sealing material. Due to the repulsive force of the sealing material, it is pressed slightly forward against the repulsive force of the spring, and is constantly pressed against the seal end face of the plug with a constant stress.

[0007]

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, 1 is a socket, and 2 is a plug. Reference numeral 3 denotes a socket main cylinder that constitutes the socket 1. Reference numeral 4 denotes a locking cylinder that is slidably fitted in the axial direction on the outer periphery of the leading end of the socket main cylinder 3, and the locking cylinder 4 is attached to the distal end thereof. is provided with a locking mechanism 5 for fixing the plug 2, the locking mechanism is ing the following configuration. 6 lock ball fitting hole provided at the tip circumferential direction of the locking cylinder 4, the lock ball 7 fitted retractably on the lock ball fitting hole 6 in the determined centrifugal direction, 8 locking cylinder 4 Is a sleeve fitted slidably in the axial direction on the outer periphery of the lock ball 7, which moves forward to press the lock ball 7 in the centripetal direction, and retreats to release the press. A spring 9 urges the sleeve 8 in the forward direction. 10 is a stopper.

Reference numeral 11 denotes an operating cylinder fitted to the outer periphery of the socket main cylinder 3 so as to be slidable in the axial direction, and the front end thereof is connected to the rear end of the locking cylinder 4. The details of this connection are as follows. A circumferential groove 12 having a U-shaped cross section is formed at the rear end of the operation cylinder 11 and opens to the inner peripheral side. On the other hand, the rear end of the locking cylinder 4 has a flange 1 protruding in the outer peripheral direction.
3 is formed, and this flange portion 13 is
In the circumferential groove 12. In the circumferential groove 12, a disc spring 16 is interposed between a surface 14 on the distal end side of the flange 13 and a wall surface 15 of the circumferential groove 12 facing the surface 14. When the cylinder 11 moves forward, the rear end surface 17 of the flange 13 is pushed by the wall surface 18 of the circumferential groove 12 to move the locking cylinder 4 forward, and when the operation cylinder 11 retreats, the flange 13 The surface 14 on the distal end side of the circumferential groove 1 is
The second wall 15 is pushed back and can be retracted.

Reference numeral 19 denotes an eccentric cam rotatably provided on the outer periphery of the socket main cylinder 3, reference numeral 20 denotes a hole formed in the operation cylinder 11, and this hole 20 is engaged with the eccentric cam 19. As the eccentric cam 19 rotates, the operating cylinder 11 moves forward and backward in the axial direction according to the amount of eccentricity of the eccentric cam 19. An operation lever 21 rotates the eccentric cam 19.

Reference numeral 22 denotes a seal member mounted in the socket main body 3, which is in contact with and seals a seal end face 23 of the plug 2 inserted into the socket main body 3. A seal end surface 23 that abuts on the seal member 22 is formed on the outer periphery of the plug 2. Regarding the positional relationship between the sealing material 22 and the sealing end face 23 of the plug 2, the plug 2 is inserted while the locking cylinder 4 is moving to the front end side.
When the lock ball 7 of the lock cylinder 4 is engaged with the lock ball engagement groove 24 provided on the outer periphery of the lock cylinder 4 and the plug 2 is fixed to the lock cylinder 4, the seal end face 23 of the plug 2 The pressure contact state is set to be equal to the pressure contact state between the seal member and the sealing surface in a normal, that is, conventional, pipe joint of this type. Reference numeral 25 denotes a sealing material for sealing the outer peripheral surface of the plug 2.

The sealing material 22 is not particularly limited, as long as it is a conventional sealing material such as resin, metal, ceramic, etc., but is not particularly limited. Wood is used.

Next, connection of the pipe joint shown in the above embodiment will be described. In the disconnected state, first, the operation lever 21 is operated to rotate the eccentric cam 19, and the operation cylinder 1
The locking cylinder 4 is moved forward through 1. In this state, the sleeve 8 is retracted against the repulsive force of the spring 9 to release the pressing of the lock ball 7, and the plug 2 is inserted from the tip of the locking cylinder 4. The lock ball engaging groove 24 provided on the outer periphery of the plug 2
Is reached, the lock ball 7 is engaged with the lock ball engaging groove 24, and the lock ball 7 is
Is pushed in the centripetal direction by the advancing sleeve 8 due to the repulsive force of the above.
At this time, the sealing end face 23 of the plug 2 is in a state of normal pressure contact with the sealing member 22 mounted in the socket main cylinder 3. This state is a so-called connection state of this type of conventional pipe joint (the state of FIG. 1).

In the present invention, from such a state, the operating lever 21 is operated again to rotate the eccentric cam 19, and the operating cylinder 1
Retreat one. The operation cylinder 11 is retracted by the rotation of the eccentric cam 19 according to the amount of eccentricity of the eccentric cam 19. When the operation cylinder 11 is retracted, the locking cylinder 4 is
Is biased in the backward direction. As a result, the plug 2 integrally fixed to the locking cylinder 4 is also urged in the same direction, and the seal end face 23 of the plug 2 is pressed against the seal member 22, and the seal member 22 pressed against the seal member 22 is pressed. Due to the repulsive force, a surface pressure corresponding to the repulsive force of the disc spring 16 is always applied in a state where the locking cylinder 4 urged in the retreating direction is pressed forward, and the sealing material 22 in the socket main cylinder 3 is provided. 2 (the state shown in FIG. 2).

[0014]

As described above, according to the present invention, the plug connected to the socket is further pushed in the forward direction by rotating the eccentric cam, so that the plug moves forward according to the eccentric amount of the eccentric cam. The amount of advance exerts a stress on the seal end face of the plug which presses against the sealing material in the socket, and can supplement the sealing surface pressure.

Further, the pressing by the eccentric cam is performed via a spring interposed between the operating cylinder and the locking cylinder, so that the plug reduces the repulsive force of the spring compressed in the thrust direction by the rotation of the eccentric cam. Urged in the forward direction,
Since the repulsive force of the spring always applies a constant stress to the seal end face of the plug that comes into pressure contact with the sealing material in the socket and complements the sealing surface pressure, regardless of the material of the sealing material mounted in the socket. Thus, the stability and integrity of the seal can be improved. In particular, since the spring is compressed by the cam mechanism, the required sealing surface pressure can be arbitrarily determined by selecting the tension of the spring.

[Brief description of the drawings]

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

FIG. 2 is a partially longitudinal side view showing a completely connected state of the pipe joint shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Socket 2 Plug 3 Socket main cylinder 4 Locking cylinder 5 Locking mechanism 11 Operation cylinder 16 Disc spring 19 Eccentric cam 21 Operation lever 22 Seal material 23 Seal end face

Claims (2)

(57) [Scope of request for utility model registration] 1. Around the outer periphery of the plug insertion end of the socket,
A locking mechanism for connecting and fixing the inserted plug is provided,
Further, in a pipe fitting in which a sealing material for abutting against the seal end face of the inserted plug and sealing between the socket and the plug is mounted, a locking mechanism is provided at the distal end of the outer periphery of the leading end of the main socket body. An eccentric cam which slidably fits the locking cylinder in the axial direction, and which is rotatively pressed on the socket main cylinder by pressing the locking cylinder toward the rear end via the operating cylinder. an operation lever to rotate the provided該操Saclay
By rotating the bar, the plug connected and fixed to the locking mechanism
And the locking cylinder that moves in conjunction with the operating cylinder.
And the socket is moved by the sealing end face of the plug.
A pipe joint which is brought into pressure contact with a sealing material mounted inside the main body of the socket. 2. The pipe joint according to claim 1, wherein the eccentric cam pushes the locking cylinder toward the rear end via a spring interposed between the operating cylinder and the locking cylinder. .