JP2507131Y2 - Pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pipe joint for fluid piping.

[Problems to be solved by conventional technology and device]

In the conventional pipe joint, a process of pre-processing such as thread cutting on the pipe to be joined is required, and a jig and a tool for that are required. Therefore, the work was troublesome and inefficient.

Therefore, an object of the present invention is to provide a pipe joint that solves the above-mentioned problems, is simple in work, and is highly efficient.

[Means for solving the problem]

According to the present invention, in order to achieve the above object, an inserted cylindrical portion for externally fitting a pipe is continuously provided at an outer end of a large diameter portion with a screw, and a concave circumferential groove is further formed on an outer peripheral surface of the cylindrical portion. A joint body in which is formed; an elastic seal member fitted in the concave circumferential groove;
A cap nut having a screw hole to be screwed into the large diameter portion with a thread on the base end side and a ball pressing inclined surface formed on the tip end side; A plurality of balls, which are plastically deformed on the insertion part of the pipe and form a groove in the insertion part to seal and lock the cylindrical part of the pipe; And a substantially cylindrical retainer having a ball holding portion which is held on the outer peripheral side.

[Action]

When the insertion part of the pipe is externally inserted into the inserted cylindrical part of the joint body and the cap nut is screwed to the large diameter part with a screw, the balls are attached to the outer peripheral side of the seal member at the ball holding part of the retainer. Since the ball pressing inclined surface presses the ball, the insertion portion of the pipe is plastically deformed on the sealing member by the ball, and a concave groove is formed in the insertion portion, and the cylinder of the pipe is formed. The part is sealed and locked.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 shows an embodiment of the pipe joint according to the present invention. The pipe joint includes a joint body 5, elastic seal members 6, 6, cap nuts 9, 9, a plurality of balls 12, ... And retainers 14, 14.

The joint body 5 shown in FIGS. 2 and 3 is integrally molded by casting or the like, and has an insertion hole 19 and a large diameter portion 1,1 with a screw. At the outer end of the
(See Fig. 1) Inserted cylindrical part 3, 3 into which the external fitting is inserted
Are lined up. Concave circumferential grooves 4, 4 are formed on the outer peripheral surfaces of the cylindrical portions 3, 3.
Are formed. Link-shaped elastic seal members 6 having a one-character cross section are fitted into the concave circumferential grooves 4, 4 (see FIG. 1).

The cap nut 9 shown in FIGS. 4 and 5 has a screw hole to be screwed into the large-diameter portion 1 on the base end side, and has a ball pressing inclined surface on the tip end side that expands toward the base end side. 8 is formed, and a plurality of locking recessed grooves 15 ... Are formed in the axial direction between the inclined surface 8 and the screw hole 7.

The retainer 14, which is loosely fitted between the cylindrical portion 3 and the cap nut 9 as shown in FIG. 1, has a substantially cylindrical shape as shown in FIG. 6 and FIG. Inclined surface 20 on the outer circumference
Are formed, and ball holding portions 13 such as a plurality of holes are formed in the vicinity of the tip, and locking protrusions 16 that are engaged with the locking recessed grooves 15 are formed on the outer peripheral surface.

As shown in FIG. 1, the retainer 13 of the retainers 14 and 14 described above.
, A plurality of metal balls 12, such as stainless steel, are held, and the retainers 14, 14 are attached to the cap nuts 9, 9. At this time, the engaging projections 16 ... And the engaging recessed grooves 15 are mounted so as to engage with each other. Next, in the screw holes 7,7 of the cap nuts 9,9,
Screw 1 lightly. Then, the end portions of the insertion portions 10, 10 of the pipes 2, 2 are inserted into the cylindrical portions 3, 3 until they come into contact with the outer ends of the large diameter portions 1, 1. Then, when the large-diameter portions 1,1 are gradually and strongly screwed into the cap nuts 9,9, the plurality of balls 12 ... At the ball holding portions 13 of the retainers 14,14 ... Since it is held on the surface side, the balls 12 are pressed by the ball pressing inclined surfaces 8. At the same time, the locking protrusions 16 ...
, The retainers 14, 14 also rotate with the cap nuts 9, 9. Therefore, with the ball 12, the insertion portion 10,
10 is plastically deformed on the elastic seal members 6, 6, and the insertion portion 10,
Grooves 11, 11 are formed on the outer periphery of 10. That is, the pipes 2 and 2 are sealed and locked to the cylindrical portions 3 and 3. Retainer 14
The balls 12 ... Rotate on the same circumferential line of the outer peripheral surface of the pipe 2.

The pipe joint of this embodiment is made of, for example, stainless steel or metal casting, but when the entire joint body 5 is made of synthetic resin, a metallic reinforcing link 17 as shown in FIG. It is desirable that the ball pressing inclined surface 8 of the cap nut 9 is formed by a metal reinforcing member 18 as shown in FIG.

FIG. 10 shows a modification of this embodiment. That is, the joint body 5
The small-diameter pipe 21 and the large-diameter pipe 22 are integrated by welding, and the large-diameter portions with screws 1 and 1 and the concave circumferential grooves 4 and 4 are formed by cutting or the like. According to this, there is an advantage that the cost can be reduced because the pipe material can be produced without casting such as the lost wax method.

It should be noted that the present invention is not limited to the above-described embodiment, and the design can be freely changed without departing from the gist of the present invention. For example, the retainer 14 may be press-molded with a thin wall, or the ball holding portions 13 may have a groove shape or a slit. Also,
Elbows, cheeses, plugs, etc. can be freely used as joints. The seal member 6 preferably has another cross-sectional shape, and may be formed of a soft synthetic resin coating layer.

[Effect of device]

Since the present invention is configured as described above, it has the great practical effects described below.

Pre-treatment steps such as thread cutting on the pipes 2 can be omitted, and the connection work of the pipes 2 can be performed easily and efficiently. Therefore, jigs and tools used in the pretreatment process are unnecessary.

The insertion portion 10 of the pipe 2 is made of the ball 12 ...
The above is plastically deformed, and the concave grooves 11 are formed, so that sealing and locking (prevention of removal) of the pipe 2 from the inserted cylindrical portion 3 are simultaneously performed reliably.

[Brief description of drawings]

1 is a sectional front view showing an embodiment of the present invention, FIG. 2 is a sectional front view of a joint body, FIG. 3 is a side view thereof, FIG. 4 is a sectional front view of a cap nut, and FIG. The same side view, FIG. 6 is a sectional front view of the retainer, FIG. 7 is the same side view, FIG. 8 is a sectional front view for explanation, and FIG. 9 is a sectional front view of a cap nut for explanation. FIG. 10 is a sectional front view showing a modified example of the joint body. 1 ... Large diameter part with screw, 2 ... Piping, 3 ... Inserted cylindrical part, 4 ... Recessed circumferential groove, 5 ... Joint body, 6 ... Elastic seal member, 7 ... Screw hole, 8 ... … Ball pressing slope, 9 ……
Cap nut, 10 …… insertion part, 11 …… concave groove, 12 …… ball,
13 …… Ball holder, 14 …… Retainer.

Claims (1)

(57) [Scope of utility model registration request] 1. An inserted cylindrical portion 3 into which a pipe 2 is externally fitted is continuously provided at an outer end of a large diameter portion 1 with a screw, and a concave peripheral groove 4 is formed on an outer peripheral surface of the cylindrical portion 3. The joint main body 5, the elastic seal member 6 fitted in the concave circumferential groove 4, the screw hole 7 threadedly engaged with the large diameter portion 1 with the screw, and the ball pressing inclined surface 8. The cap nut 9 formed on the tip end side and the cap nut 9 is pushed by the inclined surface 8 by the screwing of the cap nut 9, and the insertion portion 10 of the pipe 2 is plastically deformed on the seal member 6, and the insertion portion 10 is inserted. A plurality of balls 12 for forming a recessed groove 11 on the inner surface of the pipe 2 for sealing and locking the cylindrical portion 3 of the pipe 2.
And a substantially cylindrical retainer 14 having a ball holding portion 13 that holds the balls 12 on the outer peripheral side of the seal member 6, and a pipe joint.