JPH073618Y2 - High current terminal board mounting flange structure for electrical equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a large current terminal plate mounting flange structure fixed to an electric device such as a transformer.

[Conventional technology]

Conventionally, for example, when a large current is taken out to the outside in a transformer, it is configured as shown in FIGS. 2 and 3. In the figure, 1 is an outer box, 2 is a content part as an electric device main body, 3 is a content extraction terminal, 4 is a large current terminal plate connected to the content extraction terminal 3 via a connection conductor 5, and 6 is a large current terminal board. A terminal plate mounting flange for fixing the current terminal plate 4 to the outer box 1, the large current terminal plate 4 is fixed with bolts 7, and the other end is welded 8 to the outer box 1. Incidentally, 9 is a packing fitted in the packing groove 4a.

In the above transformer, the large current generated in the contents component 2 flows from the contents extraction terminal 3 through the connection conductor 5 to the large current terminal plate 4 and is drawn to the outside. After that, it is used as a power source for a rectifier or furnace.

[Problems to be solved by the device]

As described above, the conventional large-current terminal plate mounting flange 6 is directly fixed to the outer box 1 by welding 8, so that the terminal plate mounting flange 6 is distorted due to heat shrinkage due to welding.
There is a problem that there is a gap between the packing groove 4a and the airtightness, and because the material of the large current terminal plate 4 is an electrical problem, for example, epoxy resin is used, and if the mounting flange is distorted, When the bolt 7 was tightened, a crack sometimes occurred.

To eliminate these problems, attach the mounting flange 6 to the outer box 1.
After welding to, the method of machining the mounting flange surface,
Alternatively, there is a method of attaching a jig that restrains welding strain to the mounting flange and performing welding with the outer box, but these require large labor for the work to be machined and the need for jig production. Therefore, there is a problem that the cost becomes high.

This invention has been made to solve the above problems, and it is possible to minimize the distortion of the terminal plate mounting flange surface due to the heat shrinkage caused by welding, and to reduce the cost without making a jig for welding. The purpose is to obtain a large-current terminal plate mounting flange structure.

[Means for Solving the Problems]

In the large current terminal plate mounting flange structure according to the present invention, a spring plate is previously mounted on the lower portion of the flange, and welding between the outer box of the electric device and the terminal plate mounting flange is performed via the spring plate.

[Action]

The spring plate in this invention has the effect of absorbing the wavy force of the mounting flange surface due to heat contraction during welding, and minimizing the distortion of the flange surface.

〔Example〕

FIG. 1 shows an embodiment of the present invention. The difference from FIG. 2 is that a spring plate 10 is attached between the terminal plate mounting flange 6 and the outer case 1, and the end portion is attached to the outer case 1. And is fixed by welding 8a.

With the above-described structure, the spring plate 10 and the terminal plate mounting flange 6 are integrated, and the mounting flange surface is machined to obtain the surface accuracy of the flange surface. And then
The outer casing 1 is welded by the outer peripheral welding 8a of the spring plate 10. In this case, heat contraction during welding is absorbed by the deformation of the spring plate 10 only,
Strain on the terminal plate mounting flange surface is suppressed to a minimum and it can be fixed.

Although the above embodiment describes the large-current terminal plate mounting flange, it is necessary to machine the mounting flange surface of other electric devices, particularly where the surface accuracy is required, and to weld the product to another. It can also be applied to certain various parts.

[Effect of device]

As described above, according to the present invention, the spring plate is attached to the terminal plate mounting flange portion, and the welding with the outer box is performed via this spring plate. Therefore, the large current terminal plate mounting flange is attached to the outer box. Distortion of the flange surface due to welding at the time can be prevented, and a jig at the time of welding becomes unnecessary, which has an effect of reducing cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a large current terminal plate mounting flange according to an embodiment of the present invention, FIG. 2 is a sectional view of an essential part of a conventional device of this type, and FIG. 3 is a right side surface of FIG. It is a figure. In the figure, 1 is an outer box of the main body, 2 is a contents part, 3 is a lead-out terminal for the contents part, 4 is a large current terminal plate, 5 is a connecting conductor, 6 is a large current terminal plate mounting flange, 7 is a bolt, 8a is welding, 10 is a spring plate. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A large current terminal plate for extracting a large current from an electric device body to the outside, wherein a spring plate is interposed between a mounting flange of the terminal plate and an outer box of the electric device body, and A large current terminal plate mounting flange structure for electrical equipment, characterized in that the outer box is fixed to the tip by welding.