JP2530192Y2 - Repair welding joints - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a repair welding joint used for repairing a damaged portion of a synthetic resin gas pipe, water pipe, or the like.
About the hand.

As a method of repairing a damaged portion of a synthetic resin tube, for example, the synthetic resin tube is squeezed off on both sides of the damaged portion, and the damaged portion is cut off in the squeezed-off state, and the cut portion is cut off. After connecting a new synthetic resin pipe to the part via a joint, it is squeezed on to return the synthetic resin pipe to its original position.

When the damaged portion is repaired by the above-described method when the synthetic resin pipe is used as a gas pipe, air in a new synthetic resin pipe is mixed with the gas. It is necessary to remove the air from the new synthetic resin tube after connecting the new synthetic resin tube so that taking in the air from the new synthetic resin tube does not cause a trouble. Conventionally, as means for extracting air, when connecting a new synthetic resin pipe, a metal joint having an air release mechanism is used on one of the joints, and after connecting a new synthetic resin pipe, means for extracting air by an air release mechanism is used. It has been known. It should be noted that a welded joint made of a synthetic resin having an air release mechanism has not been found in the past.

[0004]

[Problems to be Solved by the Invention] However, in a conventional metal joint having an air venting mechanism, a connecting jig such as a bolt different from a jig for connecting a synthetic resin pipe is required for use. Therefore, there was a case where work was hindered. Further, the metal joint also has a problem that electric corrosion, corrosion, and the like are easily generated. An object of the present invention is to provide a repair welding joint suitable for cutting out and repairing a damaged portion of a synthetic resin pipe, focusing on the above problems.

[0005]

In order to solve the above-mentioned problems, in the repair welding joint of the present invention, a cylindrical joint body whose inner surface is joined to an outer surface of a synthetic resin pipe is formed of a thermoplastic resin. A heating element is provided on an inner peripheral portion of the joint body, and a through-hole for venting air is formed in the joint body in and out of the joint body .

[0006]

According to the present invention, when repairing a damaged portion of a synthetic resin tube, the synthetic resin tube is squeezed off on both sides of the damaged portion,
In the squeeze-off state, the damaged part is cut off, and a new synthetic resin pipe is connected to the cut-out part via a repair joint. The connection of this new synthetic resin pipe is achieved by causing a heating element embedded in the inner peripheral part of the joint body to generate heat and welding the inner peripheral part of the joint body to the outer peripheral part of the new synthetic resin pipe and the original synthetic resin pipe. It can be completed in a high welding state. Then Sukuizuo down the upstream side of the synthetic resin pipe than repair for welding joint, withdrawing air new synthetic resin tube from the air vent through-holes of the repair for welding joint. Then, the through hole for air release of the welding joint for repair is closed with a cap,
Then to Sukuizuo down the downstream side of the synthetic resin pipe than repair for welding joint.

[0007] When a cap body to be fitted into the through hole is formed of a thermoplastic resin and a heating element is provided in the cap body as a cap for closing the through hole, the cap body is heated. Heat the element,
High sealing performance can be ensured by welding the cap body and the through hole.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. First, a first embodiment will be described with reference to FIGS. FIG. 1 is a sectional view showing a repair welding socket and a cap for the socket, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional view showing a use state of the repair welding socket and the cap, and FIG. FIG. 4 is a process explanatory view when the damaged portion of the synthetic resin pipe is repaired by the repair welding socket.

In the repair welding socket S, a synthetic resin pipe P1 inserted from both open ends 12 and 13 is provided at an axially central position of an inner peripheral portion of the joint main body 1 in a cylindrical shape. , P2 are projected. The joint body 1 is made of polypropylene resin,
It is formed by injection molding using a thermoplastic resin such as a polyethylene resin, an ABS resin, a vinyl chloride resin, and a polybutene resin as a material.

A single conductive wire 2 serving as a heating element is buried in the inner periphery of the joint body 1 in a swirling state. In this case, the conductive wires 2
a, 2b are spirally arranged. As the conductive wire 2, besides nichrome wire, copper, nickel, copper-nickel alloy, iron-nickel alloy, iron-chromium alloy,
A metal wire made of manganese, copper nickel manganese alloy, nickel chromium alloy, or the like can be used.

A boss 1 is provided on the outer peripheral surfaces of both ends of the joint body 1.
4a and 14b are projected, and the bosses 14a and 14b
b, terminal pins 20a and 20b connected to both ends of the conductive wire 2 are built in. The terminal pins 20a and 20b are mainly made of brass, gunmetal, or the like.

The joint body 1 has a joint body 1
The air evacuation through holes 15 penetrating in and out is formed, the air vent through-holes 15 are arranged between the groups 2a and the group 2b of the conductive lines 2. Further, a tubular body 16 is raised outside the air vent through hole 15.

The cap C1 is connected to the air of the welding joint S for repair.
The cap body 3 for closing the piercing through hole 15 is fitted in the air piercing through hole 15. The cap body 3 is formed of a thermoplastic resin in a columnar shape. Is buried in a swirling state.
The conductive wire 4 has both ends protruding from the upper end surface of the cap body 3.

Therefore, the damaged portion H of the synthetic resin pipe P1 is repaired.
Squeeze the synthetic resin tube at both sides of the damaged part H
Off (see (a) in FIG. 4) and the squeeze-off state
And cut off the damaged portion H (see (b) of FIG. 4).
A new synthetic resin pipe P2 through a welding socket S for repair
(See (c) of FIG. 4). For repair welding
At least one end S of the new synthetic resin pipe P2
It can be used, there is no through hole on the other end side
Ordinary sockets may be used. This new synthetic resin
The pipe P2 is connected to a conductive wire embedded in the inner peripheral portion of the joint body 1.
2 to generate heat when energized, so that the inner circumference of the joint body 1 and the synthetic resin
High density by welding the outer circumferences of the oil pipes P1 and P2
Can be completed by wearing. Then, repair welding
The synthetic resin pipe P1 on the upstream side of theN
When the synthetic resin pipe P1 is used as a gas pipe,
Through the gas for repair welding socket SFor air releasePenetrating
Air in the new synthetic resin pipe P2 is completely removed from the hole 15
(See (d) of FIG. 4). And the welding socket for repair
To SFor air releaseThe through hole 15 is closed with the cap C1,
Then, the synthetic resin downstream from the welding socket S for repair
Squeeze pipe P1NTo return the synthetic resin pipe P1 to its original state.
Return (see (e) in FIG. 4).For air releaseClose through hole 15
In this case, the conductive material embedded in the inner peripheral portion of the cap body 3
The wire 4 generates heat, and the inner peripheral portion of the cap body 3For air release
High welded state by welding the outer periphery of through hole 15
State can be secured.

As described above, by using the welding socket S for repair and the cap C1 of this embodiment, the controller provided for connecting the ordinary welding joint and the synthetic resin pipe P1 can be used as it is at the time of repair. Therefore, the operation can be easily performed without the need for a connection jig such as a bolt as in the related art, and further, there is no electric corrosion or corrosion. Further, the adhesion between the synthetic resin P1 and the welding socket S for repair is also high. Furthermore, the cap C 1 to vent through holes 15 of the repair for welding socket S is fit into a compact, also air by the cap C1
The airtightness of the vent hole 15 is also high.

Next, a second embodiment will be described with reference to FIGS. FIG. 5 is a sectional view showing a repair welding reducer and a cap for the reducer, and FIG. 6 is a sectional view taken along line VI-VI of FIG.
It is sectional drawing.

The welding reducer R for repairing is for connecting synthetic resin pipes of different diameters, and the joint body 5 is formed in a cylindrical shape having opening ends 51 and 52 of different diameters. One conductive wire 6 serving as a heating element is buried in the inner peripheral portion of the joint main body 5 in a swirling state, and both ends of the conductive wire 6 slightly protrude from the outer peripheral surface of the joint main body 5. The joint body 5 has an air vent that penetrates the joint body 5 in and out.
A through-hole 53 is formed, and a tubular body 55 stands up outside the through-hole 53 for air release . still,
As the material of the joint body 5 and the material of the conductive wire 6, the same material as the repairing socket S of the first embodiment can be used.

The cap C2 has a cap body 3a formed in a bottomed cylindrical shape. A conductive wire 4 serving as a heating element is buried in the inner peripheral portion of the cap C2, and both ends protrude from the outer peripheral surface of the cap body 3a. That is, the cap C2 is fixed to the cylindrical body 55 of the welding socket S for repair.
Then, the conductive wire 4 is heated by energization, so that the cap C2 and the cylindrical body 55 of the repair welding socket S can be welded. The repair welding reducer R is used in accordance with the repair welding socket S shown in the first embodiment.
The case is the same as that of the second embodiment except that the used portion is different, and the description is omitted.

As described above, by using the repair welding reducer R and the cap C2 of the present embodiment,
At the time of repair, an ordinary conch roller can be used as it is, and the operation can be easily performed without the need for a connecting jig such as a bolt as in the conventional case, and further, there is no electric corrosion or corrosion. In addition, the adhesion between the synthetic resin pipes P1 and P2 and the welding reducer R for repair and the tightness of the through hole 53 for venting by the cap C2 are high.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a change in the design without departing from the gist of the present invention, the present invention will be described. Included in the invention. For example, in the embodiment as repairs for welding joint it has been taken as an example a socket and reducer, In addition, e Rubo applicable cheese, to the joint, such as a service Qi. Also, an indicator may be provided on the joint body, and the molten resin that has entered due to thermal expansion at the time of melting by the heating element may cause the indicator to protrude from the outer surface of the joint body to check the molten state.
In addition, the cross-sectional shape of the cap body is not limited to a circular shape or a square shape as long as it corresponds to the shape of the air vent through hole, the inside may be solid or hollow, or a combination of a heating element and a seal ring. Good. Further, the cap in which the conductive wire is embedded may be provided with terminal pins at both ends of the conductive wire, or bosses for incorporating the terminal pins may be provided. Further, in the embodiment, the conductive wire is used as the heating element, but a conductive resin, a conductive nonwoven fabric made of carbon fiber or metal foil, or the like may be used instead of the conductive wire.

[0021]

[Effects of the Invention] As described above, according to the present invention,
The following effects can be obtained. The present invention repairs for welding joint, air disconnect penetrating the joint body in and out to the joint body
Since come through holes are formed, to be able to extract the air of a new synthetic resin tube was replaced with damaged portion, also, the fitting body is formed of a thermoplastic resin, heating the inner periphery of the該継hand body Since the elements are arranged, the controller provided for connecting the normal welding joint and the synthetic resin pipe can be used as it is, and the work can be easily performed without the need for connecting jigs such as bolts as in the conventional case Further, there is obtained an effect that there is no electrolytic corrosion or corrosion.

[0022]

[Brief description of the drawings]

FIG. 1 is a sectional view showing a repair welding socket and a cap for the socket according to the first embodiment of the present invention;

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view showing a use state of the repair welding socket and the cap.

[Figure 4] is a process explanatory diagram when repairing the damaged portion of the synthetic resin tube with the repair socket, (a) is more Sukuizuo off Engineering <br/>, (ii) the cutting step, (c) is connecting step, (d) is an air vent step, (e) is a Sukuizuo down process.

FIG. 5 is a sectional view showing a repair welding reducer and a cap for the reducer according to a second embodiment of the present invention;

FIG. 6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

S welding socket for repair 1 joint body 15 , 53 air vent through hole 2 conductive wire (heating element) C1 , C2 cap 3, 3a cap body 4 conductive wire (heating element)

Claims (1)

(57) [Scope of request for utility model registration] 1. A circle for joining an inner surface to an outer surface of a synthetic resin tube.
The tubular joint body is formed of a thermoplastic resin, a heating element is provided on an inner peripheral portion of the joint body, and the joint body has an air vent through-hole penetrating the joint body in and out. Characterized welding joint for repair.