JPH11154619A - Transformer for welding source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure insulation of a bare wire on the right and left sides by making the cross-section of the bare wire rectangular and wrapping and winding the bare wire with an insulating tape having a width that covers at least the specific number of the rectangular planes. SOLUTION: In a process of taking up a wire 1 on an iron core 3 through an insulating spacer 5, a bare wire 1 having a rectangular cross-section and an insulating tape 2 having a width that covers at least four planes of the rectangular wire 1 are wound up on the iron core 3. Then, while the bare wire 1 and the insulating tape 2 are fed from each spool and are wound up on the iron core 3, a tape guide 4 is arranged. The tape guide 4 is formed in a shape to wrap the right and left sides of the bare wire 1 from the bottom as it winds up the insulating tape 2 and then to wrap the upper plane from the right and left sides. Thus, in the process of winding the wire 1, as the entire circumference of the wire 1 can be wrapped by the insulating tape 2, insulation of a transformer for a welding source can be maintained for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for a welding power source, and in particular, employs a forced air cooling method in which a cooling fan sucks in outside air or discharges it to outside air to suck in new outside air in order to increase the cooling effect of the transformer. The present invention relates to a method for insulating a transformer for a welding power source.

[0002]

2. Description of the Related Art In recent years, a power supply for welding has adopted a forced air cooling method using a cooling fan for the purpose of saving the installation area by miniaturization or responding to the demand for portability and saving resources. Two types of methods are employed for insulating the electric wires of the welding power transformer.

[0003] One is a method using an insulated wire in advance. As the insulating material, those coated with an insulating paint such as enamel, those using rubber for the insulating garment, and those obtained by spirally winding an insulating tape are used.

[0004] The other is an uninsulated bare electric wire, mainly in the case where the cross section of the electric wire is rectangular, an insulating tape between the lower electric wire and the next upper electric wire in the process of winding the electric wire around the iron core. It is a method of sandwiching. In this method, the insulation between the upper and lower wires is secured by the tape, but the insulation between the left and right wires is not secured by the tape. Insulation is adopted. This method can be manufactured at a lower cost than the former.

[0005]

However, the latter method, that is, a method of winding a tape between bare wires, has the following problems. That is, in a factory having a large amount of dust such as conductive iron powder such as a welding factory, the dust adheres to the transformer for the welding power source because the dust is mixed in the outside air of the forced cooling. If conductive dust adheres to the left and right sides of the wires, the insulation between the wires will be broken. Insulation could also be broken when deposited between the wire and the iron core.

The present invention solves the above-mentioned problem by adopting the latter method using an inexpensive bare wire and an insulating tape, and secures the left and right insulation of the bare wire to provide a long-term reliable inexpensive welding power source. The purpose is to provide a transformer.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a wire having a rectangular cross section is wrapped and wound with an insulating tape having a width covering at least four sides of the rectangle. Things.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In a transformer for a welding power source according to the present invention, the width of an insulating tape is wider than before, and the width of a rectangular electric wire exceeds the lower right and left side surfaces and reaches the upper surface, for example, twice the width of the electric wire. The wires are wrapped from one side (bottom) to the other side (top) of the bare wire, and the other side (top) is wrapped with the wire wound up. The following points are different from the method of employing an insulated wire in which a tape is spirally wound in advance. In the conventional method of using an insulated wire, the insulating tape is fixed by spiral interference wrapping and winding of the insulating tape. Therefore, an insulated wire is manufactured in another process (specialized wire manufacturer), and the wire is wound around the iron core in the next process (transformer manufacturer). On the other hand, in the present invention, the insulating tape is fixed by the upper electric wire to be wound next. Therefore, the insulating tape is fixed in the step of winding the electric wire around the iron core, and the manufacturing of the insulating tape and the step of winding the transformer are performed at the same time.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a bare wire, 2 is an insulating tape, 3 is an iron core, 4 is a tape guide, 5 is an insulating spacer,
Reference numeral 6 denotes a winding unit that has already been completed. FIG. 2 illustrates the shape of the tape guide.

In the process of winding the electric wire 1 around the iron core 3 via the insulating spacer 5, the iron core 3 is rotated in the direction of an arrow by an external drive system (not shown). At this time, the bare wire 1 and the insulating tape 2 are wound around an iron core. A tape guide 4 embodying the present invention is installed while the bare wire and insulating tape exit from each spool (not shown) and are wound on an iron core 3.

As shown in FIG. 2, the tape guide wraps the left and right sides of the bare wire (cross section A) from below (cross section B) (cross section B) and then wraps the upper surface from right and left (cross section C) as the insulating tape is wound up. ing.

The insulating tape cannot maintain its wrapped shape as it is, but is held down and fixed by the upper electric wire wound next in the winding stroke. If the lowermost wire is insulated from the left and right sides, the uppermost wound wire is functionally insulated. Therefore, the upper surface shape of the insulating tape may not be able to maintain the wrapped shape.

FIG. 3 shows an example of a rotary roller type tape guide. As compared with the tape guide type, the insulating tape can be strongly pressed against the electric wire by the larger number of rotating rollers 7, so that the adhesion between the insulating tape and the electric wire can be further improved.

[0015]

As described above, according to the present invention, since the entire circumference of the electric wire can be wrapped with the insulating tape during the winding process of the electric wire, the insulation of the power transformer for welding can be performed for a long time even under forced cooling air containing conductive dust. Can be maintained.

[Brief description of the drawings]

FIG. 1 is a schematic view of a step of winding an electric wire of a power transformer for welding according to an embodiment of the present invention.

FIG. 2 is a diagram showing the detailed shape of the tape guide in FIG.

FIG. 3 is a diagram showing an embodiment in which the tape guide in FIG. 2 is constituted by a rotating roller;

[Description of Signs] 1 Insulated wire 2 Insulating tape 3 Iron core 4 Tape guide

Claims (1)

[Claims] 1. A transformer for a welding power source, comprising: a rectangular insulated wire having a rectangular cross section; and an insulating tape having a width covering at least four sides of the rectangular shape.