JP2001124277A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the attachment/detachment between a socket and a plug and at the same time to hold the close sealing performance, even if an O ring is unlubricating. SOLUTION: In a connecting process between the socket body 1 and the plug body 2 via locking balls 7 of the socket body 1 and an outer circumferential groove 7a of the plug body 2, when the O ring 18 is mounted on the circumferential groove 17 formed in the outer circumferential face of the plug body 2 and the O ring 18 is pressurized and deformed by the circumferential face of the opening part of the socket body 1, a space X absorbing the displacement of the O ring 18 is formed in an approximately opposite direction of the deformation in the wall face of the circumferential groove 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint composed of a socket and a plug, which is suitable for, for example, a pipe for transporting a chemical solution used in a semiconductor manufacturing process.

[0002]

2. Description of the Related Art In a pipe joint of this type, when a plug is inserted and connected to a socket, the two are hermetically sealed via an O-ring mounted on the inner peripheral surface of the socket or the outer peripheral surface of the plug. In particular, in the case of an O-ring mounted on the outer peripheral surface side of the plug, in order to reduce the frictional resistance of the O-ring, a lubricant such as grease is applied to the O-ring, or the O-ring is coated with a fluororesin or the like. Alternatively, by taking measures such as impregnation, the frictional resistance of the O-ring is reduced.

[0003] As another countermeasure, a cylinder having a small frictional resistance, for example, made of fluororesin is mounted on the sliding inner peripheral surface of the socket, and the O-ring slides on the inner peripheral surface of the cylindrical body. A method of reducing frictional resistance has also been adopted.

[0004]

However, when this pipe joint is used, for example, in a pipe for transporting liquid chemicals used in a semiconductor manufacturing process, the above-mentioned lubricant may be used, or a coating O-ring or impregnation may be used. When an O-ring is used, the lubricant elutes into the fluid, or the coating peels off from the O-ring and particles are mixed into the fluid, so it is not suitable for this type of pipe joint requiring cleanliness. . Further, when a cylindrical body having a small frictional resistance is provided on the inner peripheral surface of the socket, the structure is rather complicated and the cost is increased.

Therefore, an O-ring that is not lubricated and has not been coated or impregnated is used. In this case, when the O-ring 28 is pressed and deformed as shown in FIG. Occurs, and the O-ring 28 is
A load that presses against the side surface 29 acts. Therefore, in order to deform the O-ring 28, frictional resistance is generated, and the frictional resistance is sequentially increased. Particularly, a tapered portion 25 for deforming the O-ring 28 is provided on the inner peripheral surface 26 side of the socket 1. At this position, the frictional resistance between the O-ring 28 and the socket 1 increases. The attachment / detachability of the O-ring becomes extremely poor, and the O-ring 28 is easily damaged at this portion, and there is a possibility that particles may be generated, resulting in a bad influence on the fluid. On the other hand, it is conceivable that the tapered portion 25 on the socket 1 side is a gently long tapered portion. However, in this case, the lengthwise direction of the socket becomes unnecessarily long. There is a problem that it is necessary to provide another valve corresponding to the length.

The present invention has been developed in view of the conventional circumstances. Even if the O-ring is not lubricated, the socket and the plug can be connected with a small force, and the hermetic sealing properties of both are maintained. It is an object of the present invention to provide a pipe joint.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to claim 1 is a method of connecting a socket body and a plug body via an engaging member of the socket body and an engaging portion of the plug body. In the above, an O-ring is attached to a circumferential groove formed on the outer peripheral surface of the plug body, and when the O-ring is pressed and deformed by the inner peripheral surface of the socket main body opening, the O-ring is moved in a direction substantially opposite to the deformed side. A pipe joint in which a space capable of absorbing a deformation amount of a ring is formed on a wall surface of the circumferential groove.

[0008] The invention according to claim 2 is that when the inner peripheral surface of the socket main body and the outer peripheral surface of the plug main body are hermetically sealed through the O-ring on the inner peripheral surface of the socket main body, An inclined surface to be deformed is formed, and in the plug body, an outer peripheral wall of the peripheral groove on the rear end side of the plug body is formed as an inclined surface extending toward a bottom wall surface, and the O-ring is provided on the socket body. When sliding on the inner peripheral surface, the O-ring is pressed along the inclined surface and is absorbed by the space formed by the inclined surface and the bottom wall surface so that the O-ring can be connected with less frictional resistance. It is a pipe joint.

According to a third aspect of the present invention, the locking member of the socket body is formed by projecting and retracting a plurality of locking balls provided on the connection side of the socket body in a centrifugal direction. Is an outer peripheral groove formed on the cylindrical outer peripheral surface of the plug main body, this locking ball is disengaged from the outer peripheral groove to detach the socket main body and the plug main body, and is opened when both are connected, and This is a pipe joint in which a valve that closes when detached is built in the socket body and the plug body, respectively.

According to a fourth aspect of the present invention, an O-ring is provided in an inner peripheral groove provided in the socket main body in a process of connecting the socket main body and the plug main body via the engaging member of the socket main body and the engaging portion of the plug main body. A pipe joint having a space formed in a wall surface of an inner peripheral groove, which is mounted and can absorb a deformation amount of the O-ring in a direction substantially opposite to the deformation when the O-ring is pressed and deformed by an outer peripheral surface of the plug body. It is.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a pipe joint according to the present invention will be described with reference to the drawings. 1 to 4 show an example of a pipe joint according to the present invention. In FIG. 1, reference numeral 1 denotes a socket main body, 2 denotes a plug main body, and an outer peripheral surface of a cylindrical main body 1 a of the socket main body 1. Has a sleeve 3 slidably provided via a spring 4. The sleeve 3 has a locking ball escape portion 5 and a pressing surface 5a on the inner side of the distal end, and a locking ball (locking member) 7 can freely move in and out of a plurality of tapered holes 6 formed near the distal end of the cylindrical main body 1. Is provided. Instead of the locking ball 7, a roll pin or the like may be used. The sleeve 3 is locked by a stop ring 8 so as not to protrude outward from the cylindrical main body 1a.

In the figure, reference numeral 9 denotes a valve built in the socket body 1 and a sealing member 10 provided on a valve body 9a is held by a holding member 9b.
The valve 9 is slidably mounted on a valve claw 12 provided in the socket body 1, and is provided so as to abut and seal the valve seat 1 c by a spring 11. Male thread 1b at the rear end of body 1
The connection member 13 for piping is connected through a seal member 14. Further, a tapered portion 15 is provided on the inner peripheral surface 16 of the opening A for inserting the plug main body 2 into the socket main body 1.

1 and 2, the structure of the plug body 2 will be specifically described.
A circumferential groove 17 is formed on the outer peripheral surface on the distal end side of the
An O-ring 18 is mounted on the inner peripheral surface 7 to hermetically seal the inner peripheral surface 16 of the socket main body 1 and the outer peripheral surface of the plug main body 2. As shown in FIGS. 3 and 4, the circumferential groove 17 is formed by forming an outer peripheral wall on the rear end side of the plug body 2 on an inclined surface 19 extending toward the bottom wall surface. The space portion X is formed larger by the wall surface. When the O-ring 18 in the circumferential groove 17 thus formed slides on the inner peripheral surface 16 of the socket body 1, the O-ring 18 is provided so as to be easily pressed by the inclined surface 19 with a small frictional resistance. . An outer peripheral groove (engaging portion) 7a for engaging with the locking ball 7 on the socket main body 1 side is provided on an outer peripheral surface at a central position of the plug main body 2, and a female screw 2b for pipe connection is provided on a rear end side. ing.

In the figure, reference numeral 20 denotes a valve built in the plug body 20, in which a sealing member 21 is provided on a valve body 20a.
The valve 20 includes a valve claw 2 provided in the plug body 2.
3 is provided so as to abut against and seal against the valve seat 2c by a spring 22 slidably mounted on the valve seat 2c.

Next, the operation of the above embodiment will be described. To connect the socket body 1 and the plug body 2, when the sleeve 3 of the socket body 1 is pulled, the locking ball 7 is located in the ball escape portion 5 formed inside the distal end of the sleeve 3, and the locking ball 7 is moved in the centrifugal direction. When the plug main body 2 is inserted into the opening A of the socket main body 1 as shown in FIGS. 1 and 3, the plug main body 2 is plugged by the tapered portion 15 formed on the inner peripheral surface 16 of the socket main body 1. The O-ring 18 mounted in the circumferential groove 17 of the main body 2 is pressed in the radial direction along the inclined surface 19. The O-ring 18 can be pressed with a smaller load than the O-ring 28 mounted in the circumferential groove 27 shown in FIG.

That is, in FIG. 4, when the O-ring 18 is pressed by the tapered portion 15 formed on the inner peripheral surface 16 of the socket body 1, a vector U shown in FIG. 4 is generated.
In this case, since the outer peripheral wall on the rear end side of the plug main body 2 is formed in the circumferential groove 17 on the inclined surface 19 extending toward the bottom wall surface, the space formed by the bottom wall surface and the inclined surface 19 is formed. The portion X is different from the space Y of the conventional structure shown in FIG.
Since the space portion X is formed large in the direction of the vector U, the deformation amount is absorbed by the space portion X when the O-ring 18 is deformed.

In addition, since the circumferential groove 17 has the inclined surface 19 formed in substantially the same direction as the vector U, the resistance against which the O-ring 18 is pressed by the inclined surface 19 is reduced, as shown in FIG. In addition, the frictional resistance is smaller than that of the side surface 29 formed perpendicular to the axis, and the connection between the inner peripheral surface of the socket main body 1 and the outer peripheral surface of the plug main body 2 becomes extremely good. 4 and 5, there is a relationship of θ ₁ > θ ₂ .

Further, as the plug body 2 is inserted, when the O-ring 18 on the inner peripheral surface 16 of the socket body 1 is in the state shown in FIG. When the locking ball 7 is released, the locking ball 7 falls into the engagement groove 7a, and the sleeve 3 returns to the previous position and the pressing surface 5
The locking ball 7 is pressed by a, and the socket body 1 and the plug body 2 are connected in a locked state. Next, when detaching both, the sleeve 3 is pulled off, and the plug body 2 is detached from the socket body 1 by being pulled out.

FIG. 6 shows another example of the pipe joint according to the present invention. In the figure, the socket body 30 and the plug body 32 are detached via a locking ball (locking member) 31 of the socket body 30 and an outer peripheral groove (engaging portion) 33 of the plug body 32. In this connection process, an O-ring 35 is attached to the inner peripheral groove 34 provided in the opening A of the socket main body 30, and when the O-ring 35 is pressed and deformed by the outer peripheral surface at the distal end of the plug main body 32, the deformation is caused. A space portion X that can absorb the amount of deformation of the O-ring 35 in a substantially opposite direction.
Is formed on the wall surface 37 of the inner peripheral groove 34. In the figure,
36 is a valve provided on the socket body 30 side which is opened when the socket body 30 and the plug body 32 are connected,
Reference numeral 39 denotes a valve provided on the plug body 32 side. In addition,
30a is a valve seat provided inside the socket body 30, 36a
Is a seal member provided on the valve 36, and 36b is a valve claw 3
Reference numeral 32c denotes a spring mounted on the plug body 32, reference numeral 32a denotes a valve seat provided inside the plug body 32, reference numeral 39a denotes a seal member provided on the valve 39, and reference numeral 39b denotes a spring mounted on the valve claw 39c. The description of the pipe joint in this example, which is the same as the part shown in the above example, is omitted, and the operation of attaching and detaching the pipe joint and the operation of the O-ring 35 in this example are shown in the above example. The same as the action,
Since the effect is the same, the description is omitted.

[0020]

As is evident from the above, according to the present invention, even in the case of a non-lubricated O-ring, the frictional resistance is reduced by forming a space substantially opposite to the deformed surface of the O-ring. For example, it is suitable for a pipe joint for a semiconductor process or the like, and its detachability is extremely good, and operability can be improved.
The sealing performance between the socket body and the plug body can also be achieved. In addition, in combination with the function of the inclined surface formed in the circumferential groove of the O-ring, there is an effect that the detachability of the socket body and the plug body can be improved.

[Brief description of the drawings]

FIG. 1 shows an example of a pipe joint according to the present invention.
It is a longitudinal cross-sectional view showing the state where the plug was inserted in the socket.

FIG. 2 is a longitudinal sectional view showing a state where the socket and the plug of FIG. 1 are connected.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a partial sectional view showing a state of a circumferential groove and an O-ring of the plug in FIG. 1;

FIG. 5 is a partial step view showing a state of a circumferential groove and an O-ring of a conventional plug.

FIG. 6 shows another example of the pipe joint according to the present invention.
It is a separation state figure showing the state where a socket main part and a plug main part were separated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Socket main body 2 Plug main body 7 Locking member (locking ball) 7a Engaging part (engaging groove) 15 Tapered part 16 Inner peripheral surface 17 Circular groove 18 O-ring 19 Inclined surface X Space

Claims (4)

[Claims] An O-ring is attached to a circumferential groove formed on an outer peripheral surface of a plug body during a connection process between the socket body and the plug body via a locking member of the socket body and an engaging portion of the plug body. When the O-ring is pressed and deformed by the inner peripheral surface of the opening of the socket body, a space is formed in the wall surface of the circumferential groove so as to absorb the amount of deformation of the O-ring in a direction substantially opposite to the deformation. A pipe fitting characterized by the following. 2. An inner peripheral surface of the socket body,
When the inner peripheral surface of the socket main body and the outer peripheral surface of the plug main body are hermetically sealed via a ring, an inclined surface for deforming the O-ring is formed, and the plug main body has a plug main body having the circumferential groove. The outer peripheral wall on the rear end side is formed on an inclined surface extending toward the bottom wall surface, and when the O-ring slides on the inner peripheral surface of the socket body, the O-ring is pressed along the inclined surface to be pressed. The pipe joint according to claim 1, wherein the pipe joint is absorbed by a space formed by the inclined surface and the bottom wall surface and can be connected with less frictional resistance. 3. The locking member of the socket body includes a plurality of locking balls provided on the connection side of the socket body and protruding and retracting in a centrifugal direction. An outer peripheral groove formed on the outer peripheral surface of the socket. The locking ball is disengaged from the outer peripheral groove to detach the socket main body and the plug main body, and is opened when both are connected, and closed when separated. The pipe joint according to claim 1, wherein the valve to be connected is incorporated in the socket body and the plug body, respectively. 4. An O-ring is mounted on an inner peripheral groove provided in the socket body in a process of connecting the socket body and the plug body via a locking member of the socket body and an engaging portion of the plug body. A pipe joint characterized in that, when pressed by the outer peripheral surface of the plug body and deformed, a space portion capable of absorbing the amount of deformation of the O-ring is formed in the wall surface of the inner peripheral groove in a direction substantially opposite to the deformation.