JPS5858770B2 - Baking and forming method for insulated conductors - Google Patents

Description

Detailed Description of the Invention The present invention relates to a molding method for baking an insulated conductor, in which the outer periphery of an insulated conductor for electrical equipment is coated with a heat-shrinkable material, and the insulated conductor is pressurized by heating the heat-shrinkable material. Baking to form is related to the forming method.

Conventionally, as conductor insulation for electrical equipment, an uncured or semi-cured thermosetting resin is wrapped around the conductor, and the insulated conductor is heated and pressurized to harden the conductor. A sheet heating element and a sealed spacer are arranged on the outer periphery of an insulated conductor consisting of a thermosetting resin insulating layer surrounding the insulated conductor through a thermal conductor, and a heat shrinkable body made of synthetic resin is wrapped around the outermost periphery. A molding method is used for baking the insulated conductor, in which the insulated conductor is baked by heating the heating element and the insulated conductor is shaped by the contraction force of the heat-shrinkable body.

The structure of an insulated conductor produced by this conventional method is shown in FIG.

In FIG. 1, a conductor 1 is an insulating layer 2 made of thermosetting resin.
A heat conductor 3 made of metal is placed on top of the heat conductor 3, and a planar heating element 4 for heating and hardening the insulating layer 2 is placed thereon, and spacers 5 and 6 are brought into contact with the heat conductor 3, and the outermost periphery of the heat conductor 3 is placed. A heat absorber 7 made of plastic resin is wound around it.

This insulated conductor is heated by placing it in a heating furnace, or by heating it from the outside with hot air or the like, and simultaneously by energizing the planar heating element 4.

In the conventional method described above, the heat-shrinking body 7 of the outer layer of the electrically insulated conductor and the baking of the inner insulating layer 2 can be performed under optimal conditions. Two types of heat sources were required, one for heating and shrinking the sheet heating element 4 for curing the resin and the other for heating and shrinking the outer heat-shrinkable body 1.

Furthermore, since the planar heating element 4 is arranged, there is a drawback that the manufacturing process of the product is required.

The purpose of the present invention is to improve the above-mentioned drawbacks, and to provide an electrically insulated conductor in which the heat shrinkage of the outer heat shrinkable layer and the baking of the internal conductor insulation layer can be performed using a single heat source. It is about providing.

For the above purpose, the present invention provides an insulated conductor consisting of a conductor and a thermosetting resin insulating layer including the conductor, and a ventilation spacer having a space through which hot air can pass through the outer periphery of the insulated conductor via a thermal conductor. A spacer and a heat-shrinkable material are wrapped around the shiso.

Baking is a method in which hot air is passed through the ventilation spacer and at the same time the outer periphery of the heat-shrinkable body is heated to shrink the heat-shrinkable body, and the insulated conductor is baked and shaped by the contraction force.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

The conductor 1 is coated with an insulating layer 2 made of thermosetting resin,
Further, a ventilation spacer 8 having a void 9 is provided on the outer layer with a heat conductor 3 interposed therebetween.

A spacer 6 is provided above and in contact with the ventilation spacer 8, and the outer periphery of the spacer 8 is covered with a heat-shrinkable body 7.

As the insulating layer 2 covering the outside of the conductor 1, thermosetting resin such as epoxy resin is used.

The thermosetting resin is coated on the conductor 1 in an uncured or semi-cured state before baking.

As the thermal conductor 3 provided outside the insulating layer 2, metals such as iron plates, copper plates, aluminum plates, etc. are generally used.

Further, the ventilation spacer 8 having the space described above absorbs the heat of the hot air passing through the ventilation spacer 8 and conducts it to the heat conductor 3 in an average manner.

The spacer 8 is made of iron, copper, aluminum, or the like.

The ventilation spacer 8 having the void 9 is divided in the longitudinal direction (the axial direction of the conductor), and a plurality of ventilation spacers 8 are arranged around the outer periphery of the insulating layer 2 as necessary.

The hot air passing through the ventilation spacer 8 can move freely in the longitudinal direction and the width direction.

In FIG. 3, the heat-shrinkable body 7 covering the outermost periphery is spaced at a certain interval in the longitudinal direction so that a part of the ventilation spacer 8 is exposed so that hot air can easily pass through the ventilation spacer 8. covered.

The thermal conductor 3 further equalizes the temperature of the hot air passing through the ventilation spacer 8 and heats the insulating layer 2 .

As the spacer 6, rubber, wood, or the like, which has a relatively low thermal conductivity, is preferably used, and a heat conductor made of metal or the like can also be used by interposing a heat insulating material.

The shape of the spacer 6 is appropriately determined so that the heat-shrinkable body 7 covering the outer periphery can uniformly press the insulating layer 2 covering the conductor 1 by its shrinking force during baking and molding.

The heat-shrinkable body 7 coated on the outer periphery is made of polyester,
Tapes made of thermoplastic resin such as polypropylene are used.

The insulated conductor baking and forming equipment configured as above is
During molding, the heat of the heat medium is transferred from the ventilation spacer 8 to the conductor insulating layer 2 via the heat conductor 3, so that unlike conventional heat sources such as sheet heating elements that contact the outside of the heat conductor 3, An appropriate curing temperature can be obtained using one type of heat source without the need for a heat source, and the weight of the spacer can be reduced.

In the above embodiment, the thermal conductor 3, the ventilation spacer 8, and the spacer 6 may be sequentially coated on the insulating layer 2 of the conductor 1. 2, and further may be covered with a heat shrinkable body 7.

In this way, it is possible to reduce the manufacturing process and the number of planar heating elements.

As described above, according to the present invention, it is possible to obtain an appropriate shrinkage force of the heat-shrinkable body coated on the outermost layer of an insulated conductor, and at the same time obtain an appropriate heating temperature of the insulating layer coated on the conductor from a type of heat source. can.

Further, the heating temperature of the outer layer and the inner layer of the insulated conductor can be maintained appropriately without using a special heating control device such as a method of heating an insulating layer made of a thermosetting resin using a planar heating element.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view to explain the conventional baking and forming method, Fig. 2 is a cross-sectional view showing the forming method of the insulated conductor according to the embodiment of the present invention, and Fig. 3 is a side view of Fig. 2. It is. 1... Conductor, 2... Insulating layer, 3...
...Thermal conductor, 6...Spacer, 7...
・・Heat shrinkable body, 8・・Ventilation spacer, 9・・・・
...Gap in ventilation spacer.

Claims (1)

[Claims] 1. A heat shrinkable body is provided on the outer periphery of an insulated conductor consisting of a conductor and a thermosetting resin insulating layer surrounding the conductor through a heat conductor and a spacer, the heat shrinkable body is heated and contracted, and the insulated conductor is applied from the outside. A method of pressing and molding an insulated conductor, characterized in that a ventilation spacer having an internal space is disposed inside the spacer, and a heat medium is allowed to flow through the space of the ventilation spacer.・