JPS5894774A - Insulated conductor product and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the insulation of terminals of conductive wires which have already been insulated by providing a conventional insulating tube around them. The end of the conductive wire has a component connected thereto, such as a terminal or connector, and the purpose of further installing an insulating jacket is to encase the exposed terminal or component of the insulated conductive wire. be.

Molding an insulating jacket around the terminals of already insulated conductive wires has been practiced for a long time. In the past, insulating tubes placed around conductive wires have been made of thermoplastic materials. Thermoplastic plastics are plastics that become plastic when heated, and when heated, they melt and become plastic.
The resin is then cooled and used. This process can be repeated tens or hundreds of times without significant changes in properties. Examples of such materials include:
These include cellulose acetate, vinyl resin, polystyrene resin, and acrylic resin.In recent years, in cases where it is undesirable for insulation tubes to soften upon reheating, thermosetting plastic insulation tubes have been used instead of thermoplastic composition insulation tubes. □ has come to be placed around conductive wires. When a thermosetting composition is molded under heat and pressure, a chemical reaction takes place that completely changes its appearance and chemical and physical properties. The final product is also resistant to reheating. Thermosetting compositions include phenolic resins, urea resins, and I.T.T.S., Linton, Massachusetts, USA.
Examples include radioactive polyhalocarbons sold by Parnand Division.

However, the problem with using thermosetting materials such as radioactive polyhalocarbons as insulation chips for conductive wires is that they tend to adhere well to the thermoplastics such as polyethylene or polypropylene that form the insulation jacket. There is no point.

As a result, the seal between the insulating jacket and the conductor's insulating tube is not sufficient (and the conductor's insulating tube can twist, become misaligned, or pull out axially within the insulating jacket). It had drawbacks.

Furthermore, when injected into the mold, the thermoset material hardens to form a thin skin adjacent to the cold mold. However, the portions close to the conductive lines are not cooled as much, so the thermosetting material remains liquid. Therefore, they have a tendency to shrink when they are later cooled. To compensate for this contraction, air is drawn in along the insulating tube of the conductor, thereby forming an air pocket in a straight path along the insulating tube inside the jacket from the atmosphere to the edge of the conductor. Ta. However, this location was one where such air pockets should not form in order to reduce the brake down voltage of the path which is lower than the brake down voltage of the insulation jacket.

Therefore, an object of the present invention is to provide a seal for a coated conductor that can reliably cover the end of a conductive wire even with an insulating tube with poor adhesion.

Another object of the present invention is to provide an insulating seal that creates a tortuous path and increases its overall length where air pockets were formed in prior devices, reducing breakdown voltage.

According to a first aspect of the invention, an elongated electrical conductor having a terminal; an insulating tube provided around said electrical conductor, said electrical conductor having at least one insulating tube adjacent to and around an end of said electrical conductor; a tube having a groove; and an insulating body closely molded around the insulating tube, the insulating body having a ridge extending into each groove in the tube, thereby A double insulated electrical conductor product is provided comprising: an insulating body that seals and secures an electrical conductor to the insulating body.

According to another aspect of the invention, a method of attaching a body to a conductor encased in an insulating tube comprises: forming at least one annular groove around the insulating tube; Molding a body of insulating material in the groove portions of the tube, such that the insulating material forms a ridge extending into each groove, thereby defining a tortuous conductive path along the exterior of the insulating tube. A method is provided in which the conductor and the insulating tube are prevented from being pulled out of the main body in the axial direction.

Hereinafter, the insulator product according to the present invention will be explained in detail using the drawings.

FIG. 1 shows a conductive wire 1, a conventional tube 2 made of an insulating material surrounding the conductive wire 1, and a tube 2 made of an insulating material surrounding the conductive wire 1.
3 shows an elongated insulated electrical conductor 3 comprising an uninsulated end lα of a . The tube 2 made of an insulating material is manufactured from a thermosetting composition such as the above-mentioned radiation polyhalocarbon. Note that this thermosetting insulating material does not adhere well to the thermoplastic material used to form the enclosing insulating jacket 19 as shown in FIG.

FIGS. 2 and 3 illustrate a jig for forming grooves in an insulating tube of conductive wire. A V-shaped type 4 having a stop wall 6 and a V-shaped bottom 4α are shown to hold the insulated conductor 3 in place. tube 2
are grooved by a friction disc 7 rotated on a seat 8 driven by a motor M. The stop wall 6 is arranged such that when the insulating tube 2 contacts the inner wall of the stop wall 6, the uninsulated end 1a of the insulated conductor 3 can extend outwardly therethrough unhindered. It has a slot 6α. Insulated conductor 3
A presser roll 9, directly above and in rotational contact therewith, is attached to the swinging arm assembly 11. When the friction disc 7 extends upwardly through the opening 5 to cut a groove in the insulating tube 2 as shown in FIG. ing.

In FIG. 3, the arrow R indicates the insulated electrical conductivity for the V-shaped type 4 when the insulating tube 2 is being cut by the rotating friction disk 7 to form the groove 12 as shown in FIG. The direction of rotation of the body 3 and the swing arm assembly 110 is shown. In FIG. 4, an elongated electrical conductor 1 enveloped by a grooved insulating edge tube is shown adjacent to the uninsulated end 1a at 360
It has an annular groove 12 of . Conductive wire insulation tube 2
around it, two or more 360
It is preferable to form an annular groove of . in any case,
When two or more equally spaced grooves are formed, an annular ridge 10 having right-angled walls is formed between each adjacent pair of grooves. The groove 12 illustrated in FIG. 4 has square walls. That is, the radial walls 13 are parallel to each other and perpendicular to the conductive line 1, and the bottom of each groove is perpendicular to this wall 13.

FIG. 5 shows a soldered connector 1 placed in a mold 16 with an insulated conductor 3 and an encasing inlet 17.
4 is illustrated. According to the present invention, the ends 1a do not need to be connected, but in FIGS. 4 and 5, the ends 1α of the conductive wire 1 are soldered to the connector 14.

When a molten thermoplastic encapsulant (not shown), such as polyethylene, polypropylene or nylon, is injected into the mold via the encapsulant inlet 17, the encapsulant is deposited in the groove 12 of the insulating tube 2. It flows into the groove and insulation jacket forming space 18 to form an enveloping insulation jacket 19 as shown in FIG. 6 having an annular ridge 2o formed therein. As the molten thermoplastic enveloping material (not shown) cools and forms the encasing insulating jacket 19, linear contraction of the insulating jacket 190 occurs along the insulating tube 2 within the mold 16. This means that the adjacent annular ridges 2o of the insulating jacket 19 clamp or grip the intermediate ridges 10 shown in FIG.
It increases the tightness of the seal between the insulating jacket 19 and the insulating tube 2 and prevents relative rotation between the connector 14 and the insulating tube 2 that would cause the conductive wire 1 to twist and break. Furthermore, the jacket ridge 20 that enters the annular groove 12
Despite the poor adhesion between the thermoplastic material forming the insulation tube 2 and the thermosetting material forming the insulation tube 2, the insulation tube 2 is mechanically prevented from being pulled out from the insulation jacket 19. . Traditionally, when molten thermoplastic encapsulant material is cooled to form a ridge-free insulating jacket, air is drawn into it from outside the mold as the material forming the jacket contracts. This resulted in an undesirable situation in which air pockets were formed between the insulating jacket and the grooveless insulating tube.

In contrast, in the present invention, the combined structure of the raised portion 2° of the annular jacket that completely enters the annular groove 12 completely seals the air that was conventionally drawn into the mold. insulation jacket 19
and the insulating tube 2. A tortuous path is longer than a conventional straight path where air pockets are formed, reducing the effectiveness of the insulation along the path and increasing high voltage leakage, or arcing.

Experiments were conducted on enveloped conductor products in which the insulating jacket is made of thermoplastic, such as polypropylene, polyethylene, or nylon, and the conductor product is insulated with a thermosetting material with poor adhesion, such as radiation-polymerized carbon. I did a room test. None of these were grooved in the past, and are grooved for the first time in the present invention, but other points are the same as the conventional ones. That is, manufactured in the same mold, with the same molding process, and with the same molding time, and
It is designed to contain the same parts.

For conductor products with non-grooved insulating tubes, the breakdown voltage between the atmosphere and the end 1α of the conductor wire is 1
It was 5-200KVDC. For those with grooved insulating tubes according to the invention, it was 50-6 oKvDc (this is the limit of the power supply). In any case,
Although the length of the covered part was approximately 9.51101 mm, the breakdown voltage of the conductive product according to the present invention was more than twice that of the conventional product.

Various modifications and changes can be made to the present invention without departing from its technical scope.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of an insulated conductor product according to the present invention. FIG. 2 is an end view of a jig for grooving insulating tubing. 3 is a side view of the jig of FIG. 2; FIG. FIG. 4 is a side view of a grooved conductive tube and a connector attached thereto. FIG. 5 is a cross-sectional view of the conductive product within the mold. FIG. 6 is a sectional view of a covered conductor product according to the present invention. ■... Conductive wire 2... Tube 3...
... Insulated conductor 4 ... Figure 7 tank 7 ... Friction disk 9 ...
... Roll 10 ... Ridge part 14 - ... Connector 16 ... Mold 19 ... Insulation jacket 20 ... Protrusion part

Claims (1)

[Scope of Claims] (1) An insulated electrical conductor product, which is an elongated electrical conductor having a terminal; An insulating tube provided around the electrical conductor,
a tube having at least one groove adjacent to and around the end of the electrical conductor; and an insulating body closely molded around the insulating tube, wherein each insulating body in the tube An electrical conductor article comprising: an insulating body having a ridge extending into the body, thereby sealing and securing the electrical conductor to the insulating body. (2. The conductive product according to claim 1, wherein the tube has two or more grooves to define a ridge between each pair of grooves. (3) In the conductor product according to claim 2, the two protrusions of the main body are configured to tighten together with the intermediate ridge, so that the insulating tube is tightened against the main body. (4) In the conductive product according to claim 1, the ridged portion is configured to prevent relative rotation or misalignment of positioning. A conductive product having the same diameter as the insulating tube. (5) In the conductive product according to claim 1, the groove has parallel walls extending in the radial direction of the tube. (6) The conductor product according to claim 1, wherein the groove is provided at 36° in the circumferential direction. (7) Patent The conductor product according to claim 6, wherein the raised portion extending in the groove has an annular shape. (8) The conductor product according to claim 1. (9) In the conductor product according to claim 8, the insulating tube is thermosetting. 00) A method of attaching a body to a conductor enclosed in an insulating tube, the method comprising: forming at least one annular groove around the insulating tube; and A body moat of an insulating material is molded in the groove portion of the insulating tube, so that the insulating material forms a ridge extending into each groove, thereby providing a winding conductive line along the exterior of the insulating tube. A method for defining a body path and preventing said conductor and said insulating tube from being pulled out of said body in an axial direction.