JPS6233283Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bushing device for static induction electric appliances such as transformers.

Conventionally, bushing devices for low-voltage, large-current stationary induction appliances such as furnace transformers for rectifiers have a bushing device for connecting the lead from the winding end to an external circuit, as shown in Figures 1 and 2. The bushing conductor 1 is integrally joined with the bushing flange 2 to form a bushing, and this bushing is fixed to an insulating plate 3 via a holding plate 4, and is further attached to a bushing receiving seat 5a of a tank 5 via the insulating plate 3. It has an attached structure. The bushing conductor 1 and the bushing flange 2 can be joined together by brazing the divided bushing conductors 1a and 1b to both sides of the bushing flange 2 at the same time, as shown in Figure 3a. Because of the high temperature, the adhesive metal 6 drips and flows, making the work difficult and causing poor adhesion of the conductive parts, resulting in a lack of reliability. As shown in Fig. 3b, arc welding can also be used for joining, but in this method, the weld metal 7 is welded in multiple layers, so the bushing flange 2 deforms due to welding heat input, and it takes time to correct the distortion. Not only is this a problem, but the oil-tightness of the gasket portion 8 after being installed as a bushing is unreliable.

For this reason, as a structure that increases the reliability of the conductive part,
Bushing conductor 1 as shown in Figure 4a and b.
A structure is adopted in which the bushing flange 2 is made into a single plate, which passes through the bushing flange 2, and the two are joined by brazing or arc welding. However, in this method, it is necessary to process the two surfaces of the bushing flange after joining, and since the bushing conductor 1 protrudes, machining becomes difficult. The bushing flange 2 is machined at the same time as the hole for inserting the bushing conductor 1, but the flange surface is machined at the same time as the hole for inserting the bushing conductor 1. However, this requires a lot of man-hours, and leakage tests are required for the parts that have been brazed or arc welded, so it requires a lot of skill. It is a necessary work. Another disadvantage is that it requires a lot of labor and time to manufacture, and is also expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the above-mentioned drawbacks by using electron beam welding or laser beam welding to manufacture bushings, and to provide a bushing device that is easy to manufacture and inexpensive.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 5, the bushing conductors 1a and 1b made of copper or aluminum and the bushing flange 2 made of copper or aluminum are heated by an electron beam or laser using a high energy density linear heat source. By butt welding and welding and integrating with the weld bead 9 of beam welding, a good bushing device can be manufactured without generating welding distortion. In this case, the bushing conductor 1a,
Butching flange 2 is used for positioning 1b.
By providing a protrusion 2a on the weld and making the thickness of the protrusion 2a equal to the thickness of the bushing conductors 1a and 1b, the welding heat input becomes uniform and quality is further improved.

Moreover, although dissimilar metals such as copper and aluminum cannot be directly welded by ordinary arc welding, even if the bushing conductors 1a and 1b shown in FIG. 5 are made of aluminum and the bushing flange 2 is made of copper, the weld bead 9 It can be welded.

Furthermore, as shown in FIG. 6, flexible bushing conductors 1c and 1d made of thin copper or thin aluminum materials with good flexibility and a bushing flange 2 are welded together using a weld bead 9 of electron beam or laser beam welding. They can also be integrated by welding. In addition, for large current applications, two or more flexible bushing conductors 1c and 1d made of thin copper or aluminum material as shown in FIG. 1
It can also be embodied.

According to the present invention having the above configuration, by using electron beam or laser beam welding using a linear heat source with high energy density, the weld cross-sectional bead area is 1/20 compared to conventionally used arc welding.
Since it is possible to weld with a penetration depth of ~1/30, there is no welding deformation that would cause problems when attaching the two bushing flanges, making it possible to manufacture high-precision bushing devices. Therefore, as shown in FIG. 5, by dividing the bushing conductors 1a and 1b and attaching them to the bushing flange 2, the leakage test required in the conventional bushing device can be omitted, quality is improved, and manufacturing is simplified. This has the effect of making a simple and inexpensive bushing device.

Furthermore, since a protrusion is formed on the bushing flange for positioning, not only can manufacturing be performed reliably, but by making the thickness of the protrusion the same as the thickness of the bushing conductor, welding heat input becomes uniform, further improving quality. .

[Brief explanation of the drawing]

Figure 1 is a front view showing a conventional bushing device for stationary induction appliances, Figure 2 is an enlarged perspective view of the main parts of Figure 1, Figures 3 a, b and 4 a, b are conventional bushing devices. 5 is a sectional view showing the mounting structure of the conductor and the bushing flange, FIG. 5 is a sectional view of a bushing device showing an embodiment of the present invention, and FIGS. 6 and 7 are
The figures are sectional views of bushing devices showing other examples of the present invention. 1, 1a, 1b, 1c, 1d... Bushing conductor, 2... Bushing flange, 3... Insulating plate,
5...tank, 9...electron beam or laser beam welding bead.

Claims (1)

[Scope of utility model registration request] A bushing conductor is attached to the tank via a bushing flange and an insulating plate to connect the windings housed inside the tank and an external circuit, and is made of copper or aluminum material with good conductivity. The said bushing conductor is irradiated with an electron beam or a laser beam on the said projection part of a bushing flange made of a copper material or aluminum material having good conductivity and having projection parts with a thickness substantially equal to the thickness of this bushing conductor formed on both sides. A bushing device for stationary induction electric appliances, characterized in that they are integrally joined by.