JPH0628739Y2 - Insulation tube assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an insulator of a lead wire connecting portion of an electric device, and particularly to a coated insulating tube of a connecting portion between a coil terminal and a lead wire of a motor or a transformer.

[Conventional technology]

For example, conventionally, for insulation of the connecting portion 13 between the coil terminal 11 and the lead wire 12 by soldering of an electric device or the like, a covered insulating tube such as 14 or 14 'shown in FIG. 3 or FIG. Is also used.) Is used. These coated insulating tubes are made of natural inorganic or organic fiber woven fabrics and their heat-resistant varnish impregnated products, synthetic fiber fabrics and their heat-resistant varnish impregnated products, vinyl chloride resin,
Extruded tubes made of Teflon resin or spiral tubes made of synthetic resin film such as biaxially stretched polyester film are used properly depending on the application in terms of withstand voltage, heat resistance, price and the like.

In addition, as shown in FIG. 3 or FIG. 4, these coated insulating tubes serve as one coated insulator for one lead wire, and are used in electric devices having many terminals such as motor and transformer coils. Connect the lead wires. These multiple coated insulation tubes are integrated and
It is fixedly attached to one of the ties.

[Problems to be solved by the invention]

Connections between the lead wires and a large number of terminals coming from these motors and transformers are dispersed in pieces. While arranging this dispersed connection part in the central part of each insulation tube, accumulate these individual insulation tubes in one place,
After the work process of binding these with a string, the work process of fixing with a string to a coil of a motor or a transformer is required. In this way, the complicated process involves many steps, resulting in very poor efficiency and low reliability of quality stability.

Further, from the viewpoint of electric insulation, a high breakdown voltage cannot be expected in the fiber woven fabric and the heat-resistant varnish-impregnated product thereof due to the texture holes and the pinholes of the varnish-impregnated film.

[Means for solving problems]

In the insulating tube assembly of the present invention, two biaxially stretched polyester films are heat-bonded in strips at a plurality of locations through a thermoplastic resin layer having a melting point lower than that of the biaxially stretched polyester film. According to the present invention, the insulating tube and the heat-sealing fixing portion are alternately formed in succession. The drawbacks due to the insulating tube and the material of the insulating tube and the process work in which the insulating tube is generally taken are completely solved.

Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG.
Is an insulating tube, 2 is a heat fusion fixing part, 3 is a biaxially stretched polyester film, 3 is a thermoplastic resin layer,
The insulating tubes 1 and the heat-sealing fixing portions 2 are formed alternately and continuously. In the heat fusion fixing portion 2, the two biaxially stretched polyester films 3 and 3 ′ are sandwiched by the thermoplastic resin layer 4,
It is a portion that is heat-bonded in a band shape.

In this embodiment, an example is shown in which the insulating tube 1 has a substantially semicircular cross section and the insulating tube 1 is a through tube.

FIG. 2 shows an example in which the insulating tube 1 has a substantially circular cross section and the insulating tube 1 is a one-side sealed tube.

The insulating tube assembly of the present invention can be manufactured, for example, as follows.

On one surface of the biaxially stretched polyester film 3, a thermoplastic resin layer 4 having a melting point within a temperature range lower than the melting point of the biaxially stretched polyester film 3 is laminated, and this laminated film and the biaxially stretched polyester film, or Two laminated films are superposed so that at least one thermoplastic resin layer 4 is on the inner side, and a heat fusion fixing part is formed so that the insulating tube 1 shown in FIG. 1 or 2 is formed intermittently and continuously. The portion 2 is heated and pressure-bonded and then cooled and solidified to form the heat-sealing fixing portion 2 and the insulating tube 1 alternately.

At this time, of the two films, one film is supplied as a flat plate and the other film is supplied as an uneven cross-section. When these are combined, the semi-circular insulation as shown in Fig. 1 is used. When the tube has a cross-sectional shape and both of the two films are provided with an uneven cross-section, the circular insulating tube cross-sectional shape as shown in FIG. 2 is formed.

First when the terminal 1 and the lead wire 2 are connected in a straight line
Form the through insulation tube as shown
When the lead wire 2 and the lead wire 2 are folded back at the connection portion 3 and are in the same direction, it is preferable to form a one-side sealed insulating tube as shown in FIG.

In the above structure, the biaxially stretched polyester film 3,
3'is not particularly limited, and any one may be used as long as the effect of the present invention is not impaired, and a commercially available ordinary polyester film can be used. Most commonly, it is a film obtained by biaxially stretching polyethylene terephthalate by a known method, but may contain other polyester in addition to polyethylene terephthalate, or may be a copolymer of other components. Good. Further, a component other than polyester may be contained within a range that does not impair the effects of the present invention.

The thickness of the biaxially stretched polyester film 3, 3'is not particularly limited, but usually 150 μm or less, preferably 25 μm or more and 125 μm or less is preferably used, and the surface thereof is, if necessary, corona discharge machined. As a means for further firmly adhering the thermoplastic resin layer 4 to the mat processing, an anchor coating treatment processing such as resin coating can be performed.

The melting point of the thermoplastic resin layer 4 needs to be lower than the melting points of the biaxially stretched polyester films 3 and 3 ', but the kind of the thermoplastic resin used for the thermoplastic resin layer 4 is not particularly limited, It may be a substance or a mixture.

However, in order to maintain a good adhesive force with respect to the biaxially stretched polyester film 3, 3'in a practical temperature range, the thermoplastic resin is in a range lower than the melting point of the biaxially stretched polyester film 3, 3 '. Therefore, a composition having a high melting point resin is preferable. On the other hand, the composition of the low melting point resin is preferable from the viewpoints of workability of laminating, economy, and prevention of dimensional change and appearance change of the biaxially stretched polyester films 3, 3 '.

As a thermoplastic resin that can simultaneously satisfy these contradictory requirements, a polyethylene terephthalate / polyethylene isophthalate copolymer as a main component and a melting point of 110 to 1 is used.
A copolymer composition within the range of 30 ° C. is preferred. Furthermore, as an auxiliary component, to maintain the adhesive strength on the high temperature side,
It is more preferable to add a polybutylene terephthalate / polybutylene isophthalate copolymer having a melting point in the range of 160 to 170 ° C. On the other hand, in order to maintain the adhesive strength on the low temperature side, especially to give impact resistance at 0 ° C or less,
Ethylene / vinyl acetate copolymer with a melting point of 95-120 ° C
It is more preferable to add a copolymer composition within the range.

These thermoplastic resin-based mixed compositions have a heating temperature of 160
Adhesive strength that is practically preferable is obtained under laminating conditions of 230 ° C and a heating time of 0.5 to 2 seconds. Of course, it is not limited to these thermoplastic resin compositions, and other thermoplastic resins or organic or inorganic additives may be mixed if necessary.

The laminated thickness of the thermoplastic resin layer 4 may be adjusted according to need, but is preferably 5 to 30 μm.

〔Example〕

Corona discharge treatment was performed on one surface of a biaxially stretched polyethylene terephthalate film (“Lumirror” # 50S10 manufactured by Toray Industries, Inc.) having a thickness of 50 μm, which was manufactured by a conventional method.
The thermoplastic resin mixture composition shown below was laminated on this treated surface by the treatment method shown below.

Thermoplastic resin mixture composition: "Vylon" GM-900 ¹⁾ (manufactured by Toyobo Co., Ltd.) 58 parts "Vylon" GM-400 ²⁾ (manufactured by Toyobo Co., Ltd.) 10 parts ・ Polybutylene terephthalate / Isophthalate copolymer ³⁾ (manufactured by Toray Industries, Inc.) 12 parts ・ "Eva Flex" P-0804 ⁴⁾ (manufactured by Mitsui Polychemicals Co., Ltd.) 20 parts Note: 1) melting point 113 ° C 2) melting point 143 ° C 3) Melting point 165 ° C 4) Melting point 95 ° C Treatment method: Corona discharge of the above-mentioned film using a general-purpose type melt extruder having a cylinder diameter of 65 mm and the above-mentioned thermoplastic resin mixture composition which has been pelletized by a usual method. It was melt-extruded and laminated on the treated surface by a usual method at a resin temperature of 280 ° C. This laminated thickness was 20 μm.

The thus-obtained structure of biaxially stretched polyethylene terephthalate film (50 μm) / thermoplastic resin layer (20 μm) was slit into widths of 46 mm and 35 mm. These two slit films are superposed so that the thermoplastic resin layers are in contact with each other and attracted, and a cross-sectional shape such as the film 3 of FIG. The diameter is 5 mm, the straight part is 3 mm, and the overall width is 35 mm. Continuous molding is performed, and while maintaining this size, the other 35 mm wide film is induction-merged, 3 mm wide, 5 rows. The heat-bonding zone of 1 was continuously formed in the film flow direction, and the thermoplastic resin layer was cooled and solidified while suppressing the upper and lower films from being separated.

Next, this continuous biaxially stretched polyethylene terephthalate film-made insulating tube assembly was cut into a length of 30 mm to obtain a through insulating tube assembly.

On the other hand, the length is 30 mm in the direction perpendicular to the film flow direction.
Make a 5mm width heat fusion fixing part for each, and from the fusion fixing part 1
It was cut at intervals of mm to obtain a one-side sealed type insulating tube assembly.

In the obtained insulating tube assembly, the upper and lower two films are firmly adhered, and the insulating tube can be smoothly inserted and attached to the lead wire and the coil terminal or these connecting parts. Good results have been obtained.

[Effect of device]

As described above, the present invention has contributed to and contributed to the rationalization of the spiral tube, the cost reduction of the insulation tube by integrating these insulation tubes, the rationalization of the process of binding the coil and the miniaturization of the motor body. The effect is enormous.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of an insulating tube assembly according to the present invention, FIG. 2 is a perspective view of another example of an insulating tube assembly according to the present invention, and FIGS. 3 and 4 are conventional insulation coatings. It is a usage example of a tube. 1 ... Insulation tube 2 ... Thermal fusion fixing part 3, 3 '... Biaxially stretched polyester film 4, 4' ... Thermoplastic resin layer 11 ... Coil terminal 12 ... Lead wire 13 ... Connection part 14 ...... Penetration tube 14 '…… One side sealed tube

Claims (6)

[Scope of utility model registration request] 1. Two biaxially stretched polyester films,
The insulating tubes and the heat-sealing fixing portions are alternately and continuously formed by being heat-sealed in a plurality of bands in a belt shape through a thermoplastic resin layer having a melting point lower than that of the biaxially stretched polyester film. Insulation tube assembly. 2. The insulating tube assembly according to claim 1, wherein the insulating tube has a semicircular cross section. 3. The insulating tube assembly according to claim 1, wherein the insulating tube has a circular cross-sectional shape. 4. The insulating tube assembly according to claim 1, wherein the insulating tube is a through tube. 5. The insulating tube assembly according to claim 1, wherein the insulating tube is a one-side sealed tube. 6. The insulating tube assembly according to claim 1, wherein the insulating tube is a mixed tube of a through tube and a one-side sealed tube.