KR20030032298A - a - Google Patents

Abstract

PURPOSE: A method for connecting water supply pipes by expanding the pipe is provided to prevent a water leakage by integrating an expanded part with the water supply pipe and a heating bushing. CONSTITUTION: A method for connecting water supply pipes(1) by expanding the pipe comprises the steps of: melting the inner and outer surfaces of the water supply pipe(1) at one side of the water supply pipe; inserting an expanding mold(2) into one side of the water supply pipe(1) and forming an expanded part(5); inserting a heating bushing(6) and another pipe into the expanded part(5); and integrating the expanded part(5) with the water supply pipe(1) and the heating bushing(6) by supplying power to a metal mesh of the heating bushing.

Description

Connection method by expansion of water pipes {a}

The present invention heats one side of the water pipe produced by extruding in a straight line with a heater and then expanded using a mold, and then the water pipe is integrally fused to the water pipe connected by using a heat generating bushing in the expansion pipe. It relates to a connection method by expansion.

In general, the tube formed by polyethylene is a water pipe used for tap water, a double wall pipe used for sewage and waste water, and a gas pipe used for moving gas.

The water pipe is produced in a length of about 6m in nature, and the joint pipe is used to connect the water pipes to each other.

The joint pipe is divided into fusion joint pipe and clamp joint pipe according to the connection method of joint pipe and water pipe.

In order to manufacture a double clamp joint pipe, a method of mutually fusion of the joint pipe formed separately to one side of the water supply pipe is used, and a patent registration is made to solve many defects for forming the joint pipe and the water pipe as a single body. An arc was proposed.

Patent registration No. 0125615 is a method of inserting the water supply pipe into the mold and supplying the raw material to integrally form the water supply pipe and the joint pipe.

However, even in the case of manufacturing a joint pipe through such a method, after inserting a water pipe connected to the inside of the joint pipe, the rubber packing must be inserted into the interior of the joint pipe, and a method of fixing the rubber packing from the outside should be used.

The structure for fixing rubber packing is domestic utility model publication No. 2000-3316 (released February 15, 2000), after inserting a water supply pipe connected to the water pipe of the water supply pipe, insert the rubber packing into the pipe and connect the pipe joint from the outside. While assembling the fixed to the joint pipe is to press the packing to prevent leakage.

However, due to the nature of the water supply pipes buried underground, the force forcing the packing is not provided continuously, because the leakage of water is easily generated due to the short life of the packing, there is a drawback that a lot of water leakage occurs.

The present invention by applying heat to one side of the water supply pipe in order to solve the defects generated when manufacturing a joint pipe to the water pipe through a separate mold or fusion method to expand the pipe through expansion mold It can be molded.

The present invention inserts a water pipe to be connected to the water pipe formed by the expansion pipe to eliminate the defect to prevent leakage by using rubber packing and insert the heat generating bushing in the expansion pipe outside the fusion fusion integrally in the expansion pipe To be connected.

The present invention is a melting process for melting the surface using a heater on the inside and the outside from one side of the water pipe,

An expansion process of forming an expansion pipe by inserting an expansion pipe mold at one side of the molten water pipe,

Insert the heating bushing and the water supply pipe to the expansion pipe to supply power to the metal mesh of the heating bushing and press the heating bushing to connect the water supply pipe through the connection process of the water supply pipe so that the water pipe, the heating bushing and the expansion pipe are integrally fused together. It is characterized by that.

1 is a cross-sectional view of a state of heating the water supply pipe of the present invention

Figure 2 is a cross-sectional view before expanding the water pipe in the present invention

Figure 3 is a cross-sectional view of a state in which the water pipe is expanded in the present invention

Figure 4 is a partial cross-sectional view before connecting the expanded water pipe in the present invention

Figure 5 is a cross-sectional view of the state connected to the water pipe expanded in the present invention

[Description of Symbols for Main Parts of Drawing]

1, 1 ': water pipe 2: expansion pipe mold

3: inclined plane 4: dated plane

5: expansion pipe 6: heat generating bushing

7: lead wire 8: connecting terminal

9: heating wire 10: metal mesh

11: heater

The present invention is to heat the outer surface and the inner surface through the heater 11 on one side of the water pipe (1) to be compressed in a straight line so that a part of the shell is melted.

The expansion pipe mold 2 is inserted into the molten water pipe 1 so that the expansion pipe 5 is molded to one side.

Therefore, it is possible to reduce the molding time and the complicated process because it does not need to fusion a separate joint pipe to one side of the water supply pipe (1), or to put it in a mold and dip it at once.

Another water supply pipe 1 'for connection is inserted into the water supply pipe 1 in which the expansion pipe 5 is formed, and the outside of the water supply pipe 1' is formed to have the same shape as the expansion pipe 5. The heating bushing 6 is inserted.

The heating bushing 6 has a metal mesh 10 integrally connected to the outer side and the inner side, and the lead wire 7 having the connection terminal 8 formed thereon protrudes on the outer side and protrudes from the inside of the lead wire 7. The copper wire in the metal mesh 10 is to be located on the outer side and the inner side of the heating bushing (6) so as to be connected from all sides.

Power is supplied to the connection terminal 8 so that the metal mesh 10 has a resistance value of 3.2 to 3.8 kW on the entire surface through the heating wire 9.

As the metal mesh 10 generates heat by the resistance value, the outer surface of the expansion part 5 and the water conduit 1 'is melted and the heat generating bushing 6 is pressed from the outside, so that the water conduit 1' is exothermic bushing ( 6) is to be integrally fixed to the expansion pipe (5).

Preferred embodiments of this invention will be described in detail with reference to the accompanying drawings.

Example

① Heating process

The heater 11 is inserted into one side of the water supply pipe 1 to heat the inner and outer surfaces of the water supply pipe 1.

At this time, the inner surface and the outer surface of the water supply pipe 1 are melted to maintain a soft state.

② Extension process

After the inner and outer surfaces of the water supply pipe 1 are melted through the heater 11, the inclined surface 3 is formed to the outside, and the expansion mold 2 of FIG. 2 having the straight surface 4 formed therein is inserted. As shown in FIG. 3, the expansion tube 5 is molded along the outer shape of the expansion tube mold 2.

③ Connection process of water pipe

The heat generating bushing 6 is inserted into the expansion pipe 5 of the water supply pipe 1, and then the water supply pipe 1 'is inserted therein.

The fusion machine is connected to the connection terminal 8 of the heating bushing 6 to supply power from the outside so that the power is supplied to the entire surface of the metal mesh 10 from the heating wire 9.

Water supply pipe (1 ') using the fusion fastening device of Utility Model Registration No. 207788, filed by the applicant from the outside while maintaining the resistance value of 3.2 to 3.8 kW when the power is supplied to the entire surface by the metal mesh 10. Outside of the heat sink (6) is pressed down.

Since the exothermic portion 5 and the outside of the water supply pipe 1 'are melted by the metal mesh 10, the exothermic bushing 6 is stepped down, so that the water supply pipe 1' is carried out through the exothermic bushing 6 as shown in FIG. ) Is integrally fused to the expansion pipe (5).

The present invention is melted by using a heater on one side of the water supply pipe after forming the expansion pipe using an expansion pipe mold to form a water pipe and expansion pipe integrally formed by eliminating the separate joint process or molding process in a short time It can be molded.

According to the present invention, the water supply pipe and the heating bushing are inserted into the expansion pipe, and then the power supply bushing is forced out from the outside while supplying power to the metal mesh of the heating bushing so that the water supply pipe, the heating bushing, and the expansion pipe are melted together so that there is no leakage. It is possible to connect water pipes.

Claims (2)

Melting process of melting the surface by using a heater on the inside and the outside from one side of the water supply pipe, An expansion process of forming an expansion pipe by inserting an expansion pipe mold at one side of the molten water pipe, Insert the heating bushing and the water supply pipe to the expansion pipe to supply power to the metal mesh of the heating bushing and press the heating bushing to connect the water supply pipe through the connection process of the water supply pipe so that the water pipe, the heating bushing and the expansion pipe are integrally fused together. Connection method by expansion of the water supply pipe, characterized in that the. The method according to claim 1, wherein the metal mesh of the heat generating bushing maintains a resistance value of 3.2 to 3.8 kW.