JPH07253182A - Coupling device of plastic pipe such as copper pipe - Google Patents

Abstract

PURPOSE:To provide a coupling device which is not removed easily, and has also a sealing property. CONSTITUTION:Between a screw tube 5 and a union nut 6 screwed to the screw tube 5, a metal ring 11 with a cut circular form to be inserted to a copper pipe 4 is provided. Taper form inner end edges 9 and 10 to which the metal ring 11 is engaged so as to contract its diameter are formed to the screw tube 5 and the union nut 6. Furthermore, a locking groove 7 to surround the copper pipe 4 at an adequate position on the inner surface of the screw tube 5 is formed, and a seal ring 8 to pressure contact to the outer peripheral surface of the copper pipe is fitted and locked to the locking groove 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for a plastic pipe such as a copper pipe.

[0002]

2. Description of the Related Art For example, when piping water systems such as tap water, there are many places where copper pipes and copper pipes or equipment must be connected. Conventionally, when connecting copper pipes and copper pipes or equipment, brazing means is used. Is commonly used.

Although the brazing means is effective because of its strength, it lacks work efficiency and requires appropriate skill.

The present invention was devised with the object of avoiding the complexity of brazing work.

[0005]

Means for Solving the Problems Between a screw cylinder and a union nut screwed to the screw cylinder, a metal ring having a truncated circular shape that fits into a plastic pipe such as a copper pipe is interposed, and the metal ring is A tapered inner end edge that engages to reduce the diameter is formed on one or both of the screw cylinder and the union nut,
In addition to this configuration, when a sealing property is expected, a locking groove surrounding the plastic tube is provided in a suitable position on the inner surface of the screw cylinder, and a sealing ring that press-contacts with the outer peripheral surface of the plastic tube is fitted into the locking groove. They are locked together.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of a connecting device for plastic pipes such as copper pipes according to the present invention. FIG. 1 is a partially cutaway front view and FIG.
FIG. 4 is a partial cross-sectional view of a state before connection.

In the drawing, the male threaded portion 2 for mounting formed on one side peripheral surface of the connector body 1 is screwed into the female threaded portion 13 formed on the device 3 so that the other male body of the connector body 1 is screwed. An example is shown in which the copper tube 4 is connected to one side without disconnecting from the connector body 1 while maintaining the sealing property. However, the male screw portion 2 side has the same configuration as the other one side and Copper tube may be connected, or a female screw portion may be provided in place of the male screw portion 2 and screwed into a male screw cylinder provided in the device, or these male pipes may be screwed together. Screw part 2
Alternatively, a female screw instead of this may be omitted to form a projecting pipe integrated with the device, and a copper pipe may be connected to the projecting pipe.

In the figure, 5 is a screw cylinder provided on the other side of the connector body 1, and the inner surface of the screw cylinder 5 side has the copper pipe 4 inserted into the screw cylinder 5 through a union nut 6.
A locking groove 7 surrounding the above is provided as a recess, and a seal ring 8 which presses the outer peripheral surface of the copper tube 4 is fitted and locked in the locking groove 7.

Further, at the tip of the screw cylinder 5, there is provided a tapered inner end edge 9 which is gradually reduced in diameter in the direction of the base of the screw cylinder 5 (direction of the seal ring 8), and is opposed to the tapered inner end edge 9. A taper-shaped inner end 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 screwed to the screw cylinder 5 of the connector body 1 so as to be disengageable, and the union nut 6 and the screw cylinder 5 have a notch between the tapered inner end edges 9 and 10, respectively. A circular metal ring (split ring) 11 is interposed, and the metal ring 11 is provided with inclined surfaces 11 ′ and 11 ′ that overlap each other when the diameter is reduced, and the metal ring 11 is compressed by the tapered inner end edges 9 and 10. Diameter of the copper tube 4
It was forcibly inserted into.

To connect the copper tube 4 to the connector body 1, first, the end side of the copper tube 4 in which the union nut 6 and the metal ring 11 are assembled in sequence is inserted into the connector body 1.
At this time, the end portion of the copper tube is locked to the locking step portion 12 provided inside the connector body 1 against the urging force of the seal ring 8 fitted and locked in the locking groove 7 in the diameter reducing direction ( This locking step 12
Is not necessarily required).

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

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

The present invention is not limited to copper pipes, but may be plastic pipes, such as thin iron pipes.

The metal ring has inclined surfaces 1 at both ends.
The inclined surfaces 11 ′ and 11 ′ having the same inclination angle are overlapped with each other when the diameter is reduced, whereby the diameter reduction deformation is favorably performed.
1'and 11 'are not always necessary.

When the inclined surfaces 11 'and 11' are overlapped with each other, the deformation (diameter reduction) portion on the copper tube 4 side is deformed into a substantially circular shape, so that the position of the copper tube 4 can be displaced as necessary to make the connector. It can be connected to the body 1.

When a water pressure test (load pressure of 30 kg) was performed on this apparatus using a copper tube having an inner diameter of 14.2 mm, there was no water leakage and the copper tube did not separate from the connector.

[0018]

Since the present invention has the above-mentioned constitution,
The plastic tube can be connected to the screw cylinder by simply screwing the union nut onto the screw cylinder.

Further, the inventions of the two items are also provided with a sealing property, so that they can be effectively applied to plumbing works such as water supply.

[Brief description of 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]

 4 Copper pipe 5 Screw cylinder 6 Union nut 7 Locking groove 8 Seal ring 9 Tapered inner edge 10 Tapered inner edge 11 Metal ring

Claims (2)

[Claims] 1. A non-circular metal ring fitted into a plastic pipe such as a copper pipe is interposed between a screw cylinder and a union nut screwed to the screw cylinder, and the metal ring is engaged with the metal ring. A joint device for a plastic pipe such as a copper pipe in which a tapered inner end edge for reducing the diameter is formed on one or both of the screw cylinder and the union nut. 2. A non-circular metal ring fitted into a plastic pipe such as a copper pipe is interposed between a screw cylinder and a union nut screwed to the screw cylinder, and the metal ring is engaged with the metal ring. A tapered inner end edge for reducing the diameter is formed on one or both of the screw cylinder and the union nut, and a locking groove that surrounds the plastic tube is recessed at an appropriate 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 is pressed against the outer peripheral surface of the plastic pipe is fitted and locked.