JP2702069B2 - Jointing device for plastic pipes such as copper pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint device for a flexible tube such as a copper tube.

[0002]

2. Description of the Related Art For example, when piping a water system such as water supply, there are many places where copper pipes and copper pipes or equipment need to be connected. Conventionally, when connecting copper pipes to copper pipes or equipment, brazing means is used. Is generally used.

[0003] Although the brazing means is effective due to its strength, it lacks work efficiency and requires a certain level of skill.

The present invention focuses on the complexity of the brazing operation and has been devised for the purpose of avoiding this.

[0005]

Means for Solving the Problems Between the screw cylinder and the union nut screwed into the screw cylinder, a broken metal ring which is fitted into a plastic pipe such as a copper pipe is interposed. A tapered inner edge which engages and reduces the diameter is formed on one or both of the screw cylinder and the union nut, and a locking groove surrounding the plastic tube is formed at an appropriate position on the inner surface of the screw cylinder. The seal groove is configured to be fitted and locked in the locking groove so as to be in pressure contact with the outer peripheral surface of the plastic tube.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a joint device for a plastic pipe such as a copper pipe according to the present invention. FIG.
Is a partial cross-sectional view of a state before connection.

As shown in the drawings, a male screw part 2 for attachment formed on one side peripheral surface of the connector main body 1 is screwed to a female screw part 13 formed on the device 3, and another one of the connector main body 1 is provided. An embodiment in which a copper tube 4 is connected to one side without detaching from the connector main body 1 while maintaining the sealing property is shown. May be connected, a female screw part may be provided in place of the male screw part 2, and this may be screwed into a male screw cylinder provided in the device. Screw part 2
Alternatively, a female pipe may be omitted to form a protruding pipe integrated with the device, and a copper pipe may be connected to the protruding pipe.

In the figure, reference numeral 5 denotes a screw tube provided on the other side of the connector main body 1. On the inner surface on the screw tube 5 side, the copper tube 4 inserted into the screw tube 5 through a union nut 6 is provided.
Is formed, and a sealing ring 8 pressed against the outer peripheral surface of the copper tube 4 is fitted and locked in the locking groove 7.

At the tip of the screw tube 5, there is provided a tapered inner edge 9 whose diameter gradually decreases in the base direction of the screw tube 5 (in the direction of the seal ring 8), and is opposite to the tapered inner edge 9. A tapered inner edge 10 whose diameter gradually decreases in the direction is provided on the inner edge of the screw cylinder 5 of the union nut 6.

The union nut 6 is engaged with the screw cylinder 5 of the connector main body 1 so as to be able to be engaged and disengaged. The union nut 6 is provided between the tapered inner end edges 9 and 10 of the screw cylinder 5. With a circular metal ring (split ring) 11 interposed, the metal ring 11 is provided with inclined surfaces 11 ′, 11 ′ that overlap each other when the diameter is reduced at both ends, and are pressed by the tapered inner edges 9, 10 to reduce the diameter. Diameter the copper tube 4
Is forcibly inserted into the.

In order to connect the copper tube 4 to the connector body 1, first, the end of the copper tube 4 in which the union nut 6 and the metal ring 11 are sequentially assembled is inserted into the connector body 1.
At this time, the copper tube end is locked to the locking step 12 provided inside the connector main body 1 against the urging of the seal ring 8 fitted and locked in the locking groove 7 in the radial direction. This locking step 12
Is not always necessary).

Next, when the union nut 6 is screwed and fastened to the screw cylinder 5, the metal ring 11 interposed between the tapered inner edges 9, 10 gradually decreases in diameter due to the tapered shape.
The diameter of the copper tube 4 corresponding to the ring 11 is reduced and press-fitted into the tube to obtain the joint device of the embodiment.

Although the tapered inner edge is formed on both the screw cylinder 5 and the union nut 6, either one of them may be used.

Further, the present invention is not limited to a copper pipe, but may be any plastic pipe such as an iron pipe having a small thickness.

The metal ring has inclined surfaces 1 at both ends.
1 'and 11', the inclined surfaces 11 'and 11' having the same inclination angle are overlapped with each other when the diameter is reduced, so that the diameter-reducing deformation is favorably performed.
1 'and 11' are not necessarily required.

When the inclined surfaces 11 ', 11' overlap with each other, the deformed (reduced diameter) portion on the copper tube 4 side is deformed into a substantially circular shape. It can be connected to the main body 1.

The apparatus was subjected to a water pressure test (load pressure: 30 kg) using a copper tube having an inner diameter of 14.2 mm. As a result, there was no water leakage and the copper tube was not detached from the connector.

[0018]

The present invention has the configuration described above,
Just by screwing the union nut into the screw tube, the plastic tube can be securely connected to the screw tube.

Further, depending on the presence of the seal ring, the seal ring also has a sealing property, so that it can be effectively applied to plumbing works such as water supply.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view.

FIG. 2 is a partial cross-sectional view of a state before connection.

[Explanation of symbols]

 Reference Signs List 4 Copper tube 5 Screw tube 6 Union nut 7 Lock groove 8 Seal ring 9 Tapered inner edge 10 Tapered inner edge 11 Metal ring

Claims (1)

(57) [Claims] 1. A metal ring having a partially circular shape inserted into a plastic pipe such as a copper pipe is interposed between a screw cylinder and a union nut screwed into the screw cylinder. A tapered inner edge for reducing the diameter is formed on one or both of the screw cylinder and the union nut, and a locking groove surrounding the plastic tube is formed in a proper position on the inner surface of the screw cylinder,
A fitting device for a plastic pipe such as a copper pipe, in which a seal ring that presses against the outer peripheral surface of the plastic pipe is fitted and locked in the locking groove.