JPS5855839Y2 - small electrical equipment - Google Patents

Description

[Detailed description of the invention] This invention aims to simplify the assembly of small electric devices that incorporate semiconductor elements such as various thyristors and transistors, such as power supplies for heaters, small dimmers, and speed controllers for small motors. It is.

Conventionally, small electrical equipment has an electrically insulated external case, and the necessary parts of the small electrical equipment, such as semiconductor elements, heat sinks, and printed circuit boards that serve as control circuits, are housed inside the case, and electrical connections are made between these necessary parts. are doing.

However, in recent years, the cases of these small electrical devices have become smaller, and there are almost no gaps when storing components, so when attaching a semiconductor heat sink to the case, it is difficult to insert your fingers into the small case with no gaps. It was difficult to manufacture, and screws and nuts were used to attach the heat sink to the case and to fix the printed circuit board to the case, which required a lot of man-hours, and the screws and nuts were protruding from the front. The appearance was unsightly.

The present invention was developed in view of this.

In the figure, 1 is a main body case of a small electrical device made of a material with good heat dissipation and has a U-shaped cross section.A large number of heat dissipating fins 11 are provided on the bottom of the main body case 1, and one side (the end piece) is provided with a printed circuit board insertion groove 12 for supporting a printed circuit board and a first cover insertion groove 13 for supporting a cover at a position in contact with the bottom surface, and on the other side, an external A terminal insertion groove 14 for supporting a wire connection terminal and a second cover insertion groove 15 for supporting a cover are provided at a position in contact with the bottom surface.

The main body case is designed to have the required internal volume, and semiconductor elements, printed circuit boards, etc. are housed therein.

Reference numeral 2 denotes semiconductor elements such as various thyristors and transistors, and the lead portion 21 of the semiconductor element and the main body case are insulated.

In this case, an insulated type element is used as the semiconductor element, or an insulator is provided between the element and the case.

Reference numeral 3 denotes a printed circuit board provided with control parts for controlling semiconductor elements, which is inserted into the printed circuit board insertion groove 12 of the main body case 1.
is inserted and supported.

Reference numeral 4 denotes a terminal for connecting a small electrical device to an external power source or other device. A terminal fitting or a lead wire 6 is provided to connect the printed circuit board 3 and the terminal 4, and a terminal is provided under the terminal. There are provided projections 41 and 42 on the top and the bottom, respectively, which can be engaged with the main body case and the cover.

Reference numeral 5 denotes a cover to prevent contact with electrical parts such as semiconductor elements and control parts, and to prevent dust from entering the inside.This side is provided with a large number of armor or holes for cooling air circulation holes 51. The ceiling is provided with a flap 52 that can be secured with a terminal, and the side surface is provided with a cover insertion groove 13.1.
Folds 53,54 are provided which can be mated with 5.

The assembly of each component configured as described above will be explained below.

First, the semiconductor element 2 is provided on the inner surface of the main body case 1 .

This semiconductor element 2 uses an insulated type element or is provided between the semiconductor element and the case with an insulator interposed therebetween, and the lead part 21 and the main body case are insulated.

Next, the printed circuit board 3 on which the control circuit has been formed in advance and the external wire connection terminal 4 are bent at right angles with the metal fittings 6 of the terminals.
Connect by soldering directly to the printed circuit board or using lead wires.

Note that when the terminal fittings are used, the printed circuit board 3 and the terminals are firmly fixed.

Next, insert the end of this printed circuit board 3 into the printed circuit board insertion groove 12 of the main body case 1 and engage it, and insert one protrusion 41 of the external wire connection terminal 4 into the terminal insertion groove 14 and engage it. Then, the semiconductor element and the printed circuit board are electrically connected.

Next, one fold 53 of the cover 5 is inserted into the first cover insertion groove 13 and engaged.

At this time, the fold 52 on the ceiling of the cover is connected to the protrusion 42 of the terminal.
and are engaged with the grooves in the terminal section.

In this state, the cover 5 can be easily attached and detached from the main body case 1 and the terminals 4, but if the other fold 54 of the cover 51 is designed and manufactured to be small, it can be removed with the necessary tools from the cooling air circulation hole 51. The fold 54 is bent into the second cover insertion groove 15, the fold 54 and the second cover insertion groove 15 are engaged, and the cover 5 and the main case 1 can be firmly fixed.

According to the present invention, the printed circuit board, terminals, and semiconductor elements can be electrically connected easily without a cover, the cover and the main case are firmly fixed by the folding back and the cover insertion groove, and the above assembly is possible. However, since this is done by insertion method, assembly is easy.

Furthermore, it is easy to attach other panels, the storage density inside the panel is high, wiring to other devices is done easily at the front, and there are no screws or nuts protruding from the outside, allowing for a beautiful finish. It has the following advantages.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view, and FIG. 2 is a sectional view of the main parts. 1...Body case, 11...Radiation fin, 12...Printed circuit board insertion groove, 13...
... Cover insertion groove, 2 ... Semiconductor element, 3.
...Printed circuit board, 4...Terminal 5...
...Cover, 52,53.54...Fold back.

Claims (1)

[Scope of utility model registration request] A main body case having a U-shaped cross section and having a large number of heat dissipating fins on the outer bottom surface and a U-shaped cross section for fixing a semiconductor has a pair of opposing printed circuit board insertion grooves and a pair of cover insertion grooves on the inner surface of both opposing sleeves. At the same time, a cover having a U-shaped cross section is attached to the main body case, and the fold formed on the inner edge of the cover is force-fitted into the cover insertion groove of the main body case so as to be integrated with the main body case. A small electrical device whose terminals are sandwiched between the cover and the cover.