JPH0771674A - Socket for pipe fitting - Google Patents

Abstract

PURPOSE:To achieve cost down by improving building workability in a socket for a pipe fitting. CONSTITUTION:In this constitution, a spring 19 and a valve receiving part 11 are fitted to the periphery of a valve element 14, having a lock ball receiving part 25 in the point end, and also held by a seal ring 20, and a flange part 12, formed in the periphery of the valve receiving part 11, is interposed by a front tube part 2 having an operating sleeve 6 of a lock ball 5 and a rear tube part 3, so as to position the valve element 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for removably connecting a socket and a plug by operating an operating sleeve and using a lock ball provided in the socket.

[0002]

2. Description of the Related Art Although many pipe joints have been manufactured and used, they consist of a socket having a lock ball that is pressed or released by an operating sleeve and a plug having a lock groove that locks or releases the lock ball. , The structure of the socket having the operation sleeve and the lock ball is more complicated than that of the plug, and particularly the structure of the socket having the valve body is further complicated, which greatly affects the cost of the pipe joint.

Conventionally, in the socket of this kind of pipe joint, a valve receiving portion fixed to the inner circumference, a valve element which is biased by a spring when not connected and abuts against a valve seat to close a fluid passage, and a lock. Many of them have a lock ball receiving portion or the like for preventing the balls from projecting to the inner peripheral surface, but generally, these are configured as separate bodies and have a non-integral structure. No. 34023, 59-158
No. 30).

[0004]

According to the pipe joint having the above-mentioned structure, the assembling work becomes very troublesome, and this is one of the major factors of cost increase. In view of the above points, the present invention aims to reduce the cost by improving the assemblability of the socket of the pipe joint.

[0005]

In order to achieve the above-mentioned object, the present invention inserts a spring and a valve receiving portion on the outer periphery of a valve body having a lock ball receiving portion at its tip and holds the spring with a seal ring, The valve body is positioned by sandwiching a flange portion formed on the outer circumference of the valve receiving portion between a front cylinder portion and a rear cylinder portion having a lock ball operation sleeve.

Further, the lock ball receiving portion and the valve body are configured in a sealed state via a packing.

Further, an annular groove is formed on the side surface of the rear tubular portion, and an annular protrusion that engages with the groove is formed on the side surface of the flange portion of the valve receiving portion.

[0008]

Since the spring and the valve receiving portion are fitted around the outer periphery of the valve body having the lock ball receiving portion at the tip and are held by the seal ring, the valve body having the lock ball receiving portion, the spring and the valve receiving portion are held. Since it can be handled as a unit, and the flange portion formed on the outer periphery of the valve receiving portion is sandwiched between the front cylinder portion and the rear cylinder portion having the operation sleeve of the lock ball so that the valve body can be positioned. Easy to assemble.

Further, since the lock ball receiving portion and the valve body are configured to be hermetically sealed via the packing, fluid leakage between the lock ball receiving portion and the valve body can be prevented.

Further, since the annular groove portion is formed on the side surface of the rear tubular portion and the annular protrusion that engages with the groove portion is formed on the side surface of the flange portion of the valve receiving portion, the front tubular portion and the rear tubular portion are formed. By the engagement between the annular projection and the annular groove portion during the sandwiching, the front tubular portion and the rear tubular portion are more reliably sealed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. In the drawings, 1 is a socket body, 2
Is a front tubular portion, 3 is a rear tubular portion screwed to the rear end of the front tubular portion 2, and the front tubular portion 2 and the rear tubular portion 3 constitute the socket body 1. Reference numeral 4 denotes a fitting hole formed on the front end side of the front cylindrical portion 2, 5 denotes a lock ball loosely fitted in the fitting hole 4, and 6 denotes an axially slidable outer periphery of the front cylindrical portion 2. It is an operating sleeve that is fitted, and is adapted to move forward to press the lock ball 5 and retract to release it. Reference numeral 7 is a spring for urging the operation sleeve 6 in the forward direction, and 8 is a stop ring for preventing the operation sleeve 6 from coming out. 9 is a step formed on the inner peripheral surface of the rear part of the front tubular part 2,
It faces the front end surface 10 of the rear tubular portion 3 screwed to the rear end of the front tubular portion 2, and the step portion 9 and the front end surface 10 sandwich a flange portion formed on the outer periphery of the valve receiving portion, which will be described later. I am supposed to wear it.

Reference numeral 11 denotes a synthetic resin cylindrical valve receiving portion fixed in the socket body 1. On the outer periphery of the valve receiving portion 11, a step portion 9 formed on the inner peripheral surface of the front cylindrical portion 2 that constitutes the socket body 1, and the front cylindrical portion 2
A flange portion 12 is formed which is sandwiched by the front end surface 10 of the rear tubular portion 3 screwed to the rear end. The flange portion 12 is sandwiched between the front tubular portion 2 and the rear tubular portion 3 so as to position the valve body described later and seal between the front tubular portion 2 and the rear tubular portion 3. There is. Further, on the inner circumference of the valve receiving portion 11, there is formed a valve seat annular projection 13 which opens and closes a fluid passage by contacting and separating a valve head portion of a valve body described later.

Reference numeral 14 is a valve body formed in a cylindrical shape, and the valve receiving portion 11 is slidably fitted on the outer periphery of the valve body 14. A valve head 15 is formed at the rear end of the valve body 14, and a seal ring 16 is attached to the valve head 15. A through hole 17 is formed in the rear cylindrical wall of the valve body 14. When the valve body 14 moves forward, the seal ring 16 of the valve head portion 15 contacts the valve seat annular protrusion 13 of the valve receiving portion 11 to close the fluid passage 18, and when the valve body 14 moves backward, the seal ring 16 of the valve head portion 15 is closed. Separates from the valve seat annular projection 13 and opens the fluid passage 18 through the through hole 17.

Reference numeral 19 is a spring fitted around the outer periphery of the valve body 14 and is interposed between the valve receiving portion 11 and the valve body 14 so that the valve body 14 can be moved toward the valve receiving portion 11 in the forward direction. I am biased. Reference numeral 20 is a seal ring that holds the valve receiving portion 11 and the valve body 14 and seals between them. A small diameter portion 21 and a large diameter portion 22 are formed at the tip of the valve body 14, and the small diameter portion 21
An annular groove 23 is formed on the tip surface of the plug, and a packing 24 for sealing the plug tip is attached to the annular groove 23. The packing 24 is pressed by the end surface of the lock ball receiving portion described later, and is prevented from coming out of the annular groove 23.

Reference numeral 25 denotes a lock ball receiving portion which slidably fits in the front cylindrical portion 2 constituting the socket body 1 and prevents the lock ball 5 from projecting to the inner peripheral surface.
Large diameter portion 2 whose rear end is formed at the tip of the valve body 14
It fits inside 2. An engagement protrusion 26 is formed on the outer periphery of the rear end of the lock ball receiving portion 25, while the valve body 14
An engagement protrusion 27 is also formed on the inner circumference of the front end of the large diameter portion 22 formed at the front end of the lock ball receiving portion 25. The lock ball receiving portion 25 is adapted to be resiliently engaged with the engagement protrusion 27 formed on the inner circumference of the tip end of the valve body 14 so as not to come off from the tip end of the valve body 14. Then, the rear end surface 28 of the lock ball receiving portion 25 attached to the large diameter portion 22 at the tip of the valve body 14 in this manner presses the packing 24 attached to the leading end surface of the small diameter portion 21 of the valve body 14, The packing 24 is designed to prevent the packing 24 from coming out of the annular groove 23. Further, the valve body 14 and the lock ball receiving portion 25 are configured in a sealed state via the packing 24.

An annular ridge 29 is formed on the side surface of the flange portion 12 of the valve receiving portion 11, and an annular groove portion 30 that engages with the annular ridge 29 is formed on the front end surface 10 of the rear tubular portion 3. The flange portion 12 is formed by the step portion 9 formed on the inner peripheral surface of the front cylindrical portion 2 constituting the socket body 1 and the front end surface 10 of the rear cylindrical portion 3 screwed to the rear end of the front cylindrical portion 2. When the two are pinched, the annular projection 29 is deformed by engaging the annular groove 30 with the tightening force, and the deformation of the annular projection 29 causes the front tubular portion 2 to be deformed.
The seal between the rear tubular portion 3 and the rear tubular portion 3 is made more reliable. Then, in order to prevent the annular projection 29 from being deformed more than necessary due to the tightening force, the rear end surface 33 of the front tubular portion 2 is prevented.
The large-diameter stepped portion 34 formed on the outer periphery of the rear tubular portion 3 is brought into contact with the rear cylindrical portion 3 to regulate the tightening force. Reference numeral 31 is a plug, and 32 is a lock ball locking groove formed on the outer periphery of the plug 31.

Next, the assembly of the above embodiment will be described. First, the packing 24 is attached to the annular groove 23 of the small diameter portion 21 formed at the tip of the valve body 14, and then the rear end portion of the pressing cylinder 25 is fitted into the large diameter portion 22. As a result, the engagement protrusion 26 formed on the outer periphery of the rear end of the lock ball receiving portion 25 and the engagement protrusion 27 formed on the inner periphery of the distal end of the large diameter portion 22 are elastically engaged, The integrity of the valve body 14 and the lock ball receiving portion 25 is maintained. In addition, the packing 24 mounted in the annular groove 23 of the small diameter portion 21 has a large diameter portion 22.
It is pressed by the rear end surface 28 of the lock ball receiving portion 25 fitted in the state of being prevented from coming out of the annular groove 23.

Next, after mounting the seal ring 20 and the spring 19 on the outer circumference of the valve body 14, the valve receiving portion 11 and the valve seat annular projection 13 are mounted on the outer circumference of the valve head portion of the valve body 14. It is slidably inserted so as to be located on the 15 side. Then, the valve receiving portion 11 is pushed against the elastic force of the spring 19 until the valve seat annular projection 13 is positioned inside the valve head 15, and the seal ring 16 is inserted into the circumferential groove 35 of the valve head 15. When the push-in of the valve receiving portion 11 is released after mounting the valve seat 14, the valve body 14 becomes
The spring 1 engaged with the end portion 37 of the large diameter portion 22 of No. 4
9, the seal ring 16 abuts against the valve seat annular projection 13, and the valve receiving portion 11, the spring 19 and the valve body 1
4 are held together.

In this way, the integrated valve receiving portion 1
1 and the like is inserted into the front cylinder portion 2 having the lock ball 5 on the tip side and the operation sleeve 6 fitted on the outer periphery, from the rear side of the front cylinder portion 2 with the lock ball receiving portion 25 in front. Part 11
The flange portion 12 formed on the outer periphery of the front cylindrical portion 2 is brought into contact with the step portion 9 formed on the rear inner peripheral surface of the front cylindrical portion 2,
When the rear tubular portion 3 is screwed to the rear end, the flange portion 12 is sandwiched between the step portion 9 of the front tubular portion 2 and the front end surface 10 of the rear tubular portion 3, and the valve receiving portion 11 is placed inside the socket body 1. Since it is fixed, the valve body 14, the spring 19, and the lock ball receiving portion 25 are also assembled in the socket body 1.

The flange portion 12 formed on the outer periphery of the valve receiving portion 11 sandwiched between the step portion 9 of the front tubular portion 2 and the front end surface 10 of the rear tubular portion 3 has an annular ridge 29 on its side surface. On the other hand, since the annular groove 30 that engages with the annular ridge 29 is formed on the tip end surface 10 of the rear tubular portion 3 that abuts against this side surface, the step portion 9 and the rear tubular portion of the front tubular portion 2 are formed. When the 3 is clamped at the tip surface 10, the elasticity and the plastic deformation due to the tightening caused by the material characteristics of the valve receiving portion 11 made of synthetic resin, and the annular projection 2
9 and the engagement of the annular groove portion 30 are combined to seal between the front cylindrical portion 2 and the rear cylindrical portion 3. In this way, the socket of the pipe joint is assembled.

[0021]

As described above, according to the present invention, the spring and the valve receiving portion are inserted and fitted around the outer periphery of the valve body having the lock ball receiving portion at the tip and are held by the seal ring. The valve body having the valve, the spring, and the valve receiving portion can be handled as a unit, and the flange portion formed on the outer periphery of the valve receiving portion is sandwiched between the front tubular portion and the rear tubular portion having the lock ball operating sleeve. Since the valve body is positioned, the socket can be assembled by a simple operation, the cost can be reduced by improving the assemblability, and the lock ball receiving portion and the valve body are separated from each other. Since it is configured to be sealed via the packing, it is possible to prevent fluid leakage from between the lock ball receiving portion and the valve body, and further, to form an annular groove portion on the side surface of the rear tubular portion, Since the annular projection that engages with the groove is formed on the side surface of the flange of the valve receiving portion, the annular projection and the annular groove should engage with each other when sandwiched between the front cylinder and the rear cylinder. As a result, the front tubular portion and the rear tubular portion are more reliably sealed, and the sealability between the front tubular portion and the rear tubular portion can be improved.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view showing a state in which a plug is connected to the socket shown in FIG.

FIG. 3 is an enlarged view of part A of FIG.

[Explanation of symbols]

 2 Front cylinder part 3 Rear cylinder part 5 Lock ball 6 Operation sleeve 11 Valve receiving part 12 Flange part 14 Valve body 19 Spring 20 Seal ring 24 Packing 25 Lock ball receiving part 29 Annular protrusion 30 Annular groove part

Claims (3)

[Claims] 1. A spring ball and a valve receiving portion are fitted into the outer periphery of a valve body having a lock ball receiving portion at its tip and held by a seal ring, and a flange portion formed on the outer periphery of the valve receiving portion is provided with a lock ball. 2. A socket for a pipe joint in which the valve body is positioned by being sandwiched between a front cylinder part and a rear cylinder part having the operation sleeve. 2. The socket of a pipe joint according to claim 1, wherein the lock ball receiving portion and the valve body are configured in a sealed state via a packing. 3. An annular groove portion is formed on a side surface of the rear tubular portion,
2. The socket for a pipe joint according to claim 1, wherein an annular protrusion that engages with the groove is formed on a side surface of the flange of the valve receiving portion.