JPH0429185Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a resin-coated pipe joint for connecting a plastic pipe and a flexible pipe whose outer surface is coated with resin. In particular, the present invention relates to a resin-coated pipe joint suitable for the case where the resin-coated flexible pipe is a metallic flexible pipe with a corrugated outer surface and a substantially cylindrical resin-coated pipe.

[Conventional technology] Conventional flexible pipe joints, for example,
This flexible pipe joint is disclosed in Japanese Patent No. 114392 and is shown in FIG. Further, a conventional plastic pipe joint is disclosed in, for example, US Pat. No. 4,229,025, which is shown in FIG. A pipe joint body 21 and a nut 22 of the flexible pipe joint shown in FIG. 2 are screwed together and are made of metal. On the other hand, the pipe joint body 31 of the plastic pipe joint shown in FIG. 3 is made of plastic because one end thereof is fused to another pipe joint body.

[Problems to be solved by the invention] These conventional plastic pipe joints and flexible pipe joints have the problem that they cannot connect plastic pipes and flexible pipes whose outer surfaces are coated with resin; If the conventional plastic pipe fitting main body 31 and the flexible pipe fitting main body 21 are made integral and made of metal in order to connect the There was a question of whether to apply it.

The object of the present invention is to provide a pipe joint whose outer surface is coated with resin and which can connect a plastic pipe and a flexible pipe.

[Means for Solving the Problems] The present invention is a pipe joint for connecting a flexible pipe whose outer surface is coated with resin and a plastic pipe, which has been made to achieve the above-mentioned object. a pipe joint body having a thread on its outer circumferential surface, its inner circumferential surface being a cylindrical inner circumferential surface, the outer surface on the connection side of the plastic pipe being coated with resin, and a radial groove formed on the inner circumferential surface; A nut whose outer surface is coated with resin and which is screwed into the female thread of the pipe fitting body and has a collar at the end; and a nut whose outer surface is fitted with the cylindrical inner circumferential surface of the pipe fitting body, and whose inner circumferential surface is made of resin. a retainer that engages with the outer surface of the flexible tube from which the coating has been removed; a stiffener having a collar portion that contacts the end of the plastic tube; and a cylindrical portion that fits into the inner peripheral surface of the plastic tube; and a collar portion of the nut. an annular rubber gasket provided on a longitudinal surface of the resin coating; an annular rubber gasket that seals the resin coating extending from the nut body on the side opposite to the brim of the nut and the resin coating of the pipe fitting body; and the pipe fitting. This pipe joint is characterized by comprising an annular rubber gasket provided on the longitudinal surface of the resin coating on the side surface of the end portion of the main body.

[Example] FIG. 1 shows an embodiment of a pipe joint according to the present invention.

FIG. 1 shows a pipe joint in which a plastic pipe 19 and a flexible pipe 18 are connected. The flexible tube 18 consists of a flexible tube body 181 made of metal and having a corrugated outer surface, and a resin coating section 182 that is coated with resin in a substantially circular tube shape.When connecting to a pipe joint, the end portion of the flexible tube 18 is coated with resin. Section 182 has been removed.

In this embodiment, the right side is the connection part with the flexible pipe 18, and the left side is the connection part with the plastic pipe 19. Only the fitting body 11 is present integrally with the flexible pipe connection and the plastic pipe connection. The pipe joint body 11 has a resin coating 111 applied to the outer peripheral surface of the plastic pipe connection side and the side surface of this end, and a plurality of annular grooves 113 are cut in the inner peripheral surface thereof. The flexible pipe connection side of the tube joint body 11 has a thread 114 on its outer circumferential surface, and its inner circumferential surface is a cylindrical inner circumferential surface 115. In addition, on the inner peripheral surface of the central part of the pipe joint body 11, there is a protrusion 11 on which the ends of the plastic pipe 19 and the flexible pipe 18 come into contact.
6 is formed all around the inner peripheral surface. A nut 1 that is screwed into the male thread 114 of this pipe joint body 11
2 has a collar 122 inside the end of a nut body 123, and a resin coating 121 is applied to the outer peripheral surface of the nut body 123 and the outer surface of the collar 122. Cylindrical inner circumferential surface 1 of the male thread part of the pipe joint body 11
The inner peripheral surface of the retainer 13 that fits into the flexible tube 15 has a corrugated shape that engages with the corrugated outer surface of the flexible tube main body 181 of the flexible tube 18 .

Next, the connection between the plastic pipe 19 and the pipe joint body 11 will be explained. First, plastic tube 19
Insert the stiffener 14 into the end of the. The stiffener 14 includes a cylindrical portion 141 having an outer diameter larger than the inner diameter of the plastic tube 19, and a collar portion 142 extending outwardly, that is, radially, from the end of the cylindrical portion 141.
When this is inserted into the plastic tube 19, the diameter of the plastic tube 19 expands, and one side of the collar portion 142 of the stiffener 14 comes into contact with the side end surface of the plastic tube 19. This stiffener 1
4, the plastic pipe 19 whose diameter has been enlarged is pushed in from the plastic pipe connection side of the pipe joint body 11. This insertion is done at the collar 1 of the stiffener 14.
42 until it hits the protrusion 116 formed all around the inner peripheral surface of the pipe joint body 11. Since the plastic tube 19 inserted in this manner has an expanded diameter, it bites into the groove 113 on the inner peripheral surface of the pipe joint body 11 and is prevented from being pulled out. At this time, plastic tube 1
In order to seal between the outer circumferential surface of the tube 9 and the resin coating 112 on the end side surface of the pipe joint body 11, a groove is dug in the surface of the resin coating 112 on the end side surface parallel to and opposed to the outer circumferential surface of the plastic tube 19. An annular rubber gasket 15 is attached and fixed in the groove.

Next, the connection between the flexible pipe 18 and the pipe joint body 11 will be explained. First, the flexible tube 18 is inserted into the nut 12 from the collar 122 side of the nut 12. The retainer 13 is attached to the end of the flexible tube 18 fitted into the nut 12, from which the resin coating 182 has been removed. This retainer 13 is 2
It is assumed that a cut groove is made at one location on the division or circumference over the entire length in the longitudinal direction. And this retainer 1
The attachment position No. 3 is a position where two to three peaks at the end of the flexible tube main body 181 protrude from the retainer 13.

The retainer 13 of the flexible pipe 18 with the retainer 13 attached is inserted into the cylindrical inner circumferential surface 115 of the pipe joint body 11, and then the nut 12 is inserted into the male thread 114 of the pipe joint body 11.
Tighten. At this time, nut 12's brim 122
is in contact with the side surface of the end of the retainer 13, so the retainer 13 and flexible pipe 18 are connected to the pipe joint body 1.
Push it deep into 1. This tightening is performed so that two to three peaks at the extreme end of the flexible pipe body 181 are connected to the pipe joint body 11.
This is done until it is crimped onto the protrusion 116 on the inner circumferential surface of. At this time, the resin coating portion 182 of the flexible tube 18
In order to seal between the resin coating 121 of the nut 12 and the outer surface of the collar 122 of the nut 12, a groove is dug in the surface of the resin coating 121 facing the flexible tube 18 on the outer surface of the brim 122 of the nut 12, and a rubber packing 16 is mounted and fixed in this groove.

Furthermore, the resin coating 121 of the nut 12 is
The resin coating 121 is extended to the side opposite to 2, and in order to seal the inner circumferential surface of this extending portion and the outer circumferential surface of the resin coating 111 of the pipe fitting body 11, a Annular rubber gasket 17
Attach and fix. As shown in FIG. 1, the rubber seal 17 is attached and fixed by forming a protrusion 117 over the entire outer circumference of the resin coating 111 of the pipe joint body 11 and covering the protrusion 117 with the rubber seal 17, or by digging a groove at this position. An annular rubber gasket having an O-shaped cross section may be fitted into this groove.

The pipe joint of this embodiment can connect the plastic pipe 19 and the flexible pipe 18, and the pipe joint is coated with resin.

[Effects of the invention] As explained above, the pipe joint according to the invention is coated with resin and has the effect of being able to connect a plastic pipe and a flexible pipe.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a partial sectional view showing a conventional flexible pipe joint, and FIG. 3 is a sectional view showing a conventional plastic pipe joint. 11...Pipe joint body, 12...Nut, 13...
...retainer, 14...stiffener, 15,1
6, 17...Rubber gasket, 18...Flexible tube, 19...Plastic tube, 111,121
... Resin coating, 113 ... Groove, 114 ... Male thread, 115 ... Cylindrical inner peripheral surface, 116 ... Protrusion, 1
22...Brim, 123...Natsuto body, 141...
...Cylindrical portion, 142...Brim portion, 182...Resin coating portion, 181...Flexible tube body.

Claims (1)

[Scope of utility model registration request] A pipe joint for connecting a flexible pipe whose outer surface is coated with resin and a plastic pipe, the flexible pipe having a thread on the outer peripheral surface on the connection side, the inner peripheral surface of which is a cylindrical inner peripheral surface, and The outer surface of the fitting body is coated with resin on the connecting side and has a radial groove formed on the inner circumferential surface of the fitting body, and the outer surface of the nut body is screwed onto the male thread of the fitting body and has a collar at the end. a retainer having an outer circumferential surface that fits into the cylindrical inner circumferential surface of the pipe joint body and whose inner circumferential surface engages with the outer surface of the flexible tube from which the resin coating has been removed; a stiffener having a contacting brim portion and a cylindrical portion that fits into the inner circumferential surface of the plastic tube; an annular rubber packing provided on the longitudinal surface of the resin coating of the brim portion of the nut; and a stiffener on the opposite side of the nut brim. It is characterized by comprising an annular rubber gasket that seals the resin coating extending from the main body and the resin coating of the pipe fitting body, and an annular rubber gasket provided on the longitudinal surface of the resin coating on the side surface of the end of the pipe fitting body. pipe fittings.