JPH1194293A - Electrical package box assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical parts box assembly capable of enough cooling even high output large capacity electronic parts, and of preventing, even when a flame builds up from electronic parts, the flame from leaking to the outside. SOLUTION: Ventilating holes 17, 18, 19, 20 are provided in an upper surface 16 of an electrical package box 1 comprising an incombustible material. Aluminum heat sinks 25, 26 are opposed to part of these holes. A power transistor is provided on a lower surface side of the heat sinks 25, 26. A rising air stream heated with heat from electronic parts is smoothly exhausted to the outside through the openings in the upper surface 16. Even when the electronic parts is fired and a flame is built up, the flame is prevented from leaking to the outside of the electrical package box 1 because part of the openings in the upper surface 16 of the electrical package box 1 is closed with the aluminum heat sinks 25, 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical component box assembly used for, for example, an air conditioner.

[0002]

2. Description of the Related Art Conventionally, in this type of electrical component box assembly, electronic components such as a power transistor and an electrolytic capacitor are arranged in an electrical component box made of a flame-retardant material such as a flame-retardant resin or metal. . The upper surface of the electrical component box has a sealed structure so that even if the electronic component ignites, the flame that rises from it is blocked by the sealed upper surface of the electrical component box so that the fire does not spread. Openings for ventilation are provided on the lower surface and side surfaces of the box to cool the electronic components.

[0003]

Recently, in a large-sized air conditioner, electronic components have a large output (for example, 90%).
W) When the capacity is increased, it has been found that there is a problem that the electronic components cannot be sufficiently cooled just by enlarging the electrical component box and opening the ventilation openings on the lower surface and side surfaces thereof. .

When an opening is formed in the upper surface of the electrical component box, even a high-output, large-capacity electronic component can be sufficiently cooled. However, when the electronic component is ignited, a flame is exposed to the outside. There is a problem of spreading.

Therefore, an object of the present invention is to sufficiently cool even a high-output, large-capacity electronic component, and furthermore, if a flame rises from the electronic component, the flame leaks out. It is an object of the present invention to provide an electrical component box assembly that can prevent the occurrence of the electrical component box.

[0006]

According to a first aspect of the present invention, there is provided an electric component box assembly formed of a flame-retardant material for accommodating an electronic component and having an opening in an upper surface portion. The electronic component box is characterized by comprising: a product box; and an aluminum heat sink, which is disposed in the electrical component box so as to face at least a part of the opening and has electronic components mounted on a lower surface side.

[0007] According to the above configuration, the rising airflow heated by the heat from the electronic components is smoothly discharged to the outside through the opening in the upper surface of the electrical component box. Further, since the heat sink faces the opening, the radiant heat from the heat sink is directly discharged to the outside through the opening. Therefore, the electronic component is sufficiently cooled.

Further, even if the electronic component ignites and a flame rises, at least a part of the opening on the upper surface of the electrical component box is closed by the aluminum heat sink, so that the flame leaks out of the electrical component box. Hateful. In particular, even if the electronic component on the lower surface of the heat sink ignites, the flame from the electronic component is blocked by the heat sink and hardly exits through the opening. Therefore, fire spread can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

As shown in FIG. 1, the electrical component box 1 comprises an electrical component box body 2 made of a flame-retardant resin and a front lid 3 made of a flame-retardant resin. The front lid 3 is detachably fixed to the electrical component box main body 2 by locking portions 4 and 5. Openings 11 and 12 for ventilation are provided in side portions 7 and 8 of the electrical component box main body 2, respectively.

On the other hand, as shown in FIG. 2, the upper surface portion 16 of the electrical component box main body 2 is provided with elongated openings 17, 18, 19, 20 extending in parallel in the front-rear direction. A printed circuit board 23 is attached to the side surface 7 of the electrical component box main body 2. As shown in FIG. 3, transistors 31 and 35, electrolytic capacitors 32 and
Electronic components such as a connector 33, a connector 34, and a resistor are mounted.

Further, heat sinks 25, 26 made of aluminum are fixed to the printed circuit board 23, and the heat sinks 25 face a part of the elongated openings 17, 18 in the upper surface portion 16 of the electrical component box main body 2. 26 faces a part of the elongated openings 19 and 20. A slight gap is provided between the upper surfaces of the heat sinks 25 and 26 and the lower surface of the upper surface 16 of the electrical component box 2. Further, power transistors 36 and 37 are fixed on the lower surface side of the heat sinks 25 and 26, that is, on the rear surface side.
Furthermore, a large-capacity electrolytic capacitor 32 is connected to the printed circuit board 23 so as to be located directly below the heat sink 26.
It is fixed to.

According to the above configuration, heat from the electronic components is radiated to the outside by the air flow passing through the ventilation openings 11, 12, 17, 18, 19, and 20 of the electrical component box 1 and the radiant heat. In particular, the ascending air current generated by the heat from the electronic components is generated by the elongated openings 17, 18, 19, 2 in the upper surface 16 of the electrical component box main body 2.
It is smoothly discharged outside through 0. Further, the heat sink 25 made of aluminum faces each part of the openings 17 and 18 and the heat sink 26 faces each part of the openings 19 and 20.
The radiant heat from 6 is released directly to the outside through the openings 17, 18, 19, 20. Therefore, the electronic component is sufficiently cooled.

Further, even if the electronic component is ignited and a flame rises, the openings 17, 18,
Since the heat sinks 25 and 26 made of aluminum respectively block a part of the components 19 and 20, the flame is hardly leaked to the outside of the electrical component box 1. In particular, even if the power transistors 36, 37, etc. on the lower surfaces of the heat sinks 25, 26 and the electrolytic capacitor 32 immediately below the heat sink 26 are ignited, the rising flame from them is blocked by the heat sinks 25, 26 and the opening 17 , 18, 19, and 20. Therefore, fire spread can be prevented.

In the above embodiment, the front cover of the electrical component box can be removed from the electrical component box main body. However, the side portion, the upper surface portion, or the lower surface portion may be removable from the electrical component box main body.

In the above embodiment, the aluminum heat sink faces part of each opening on the upper surface of the electrical component box. However, the heat sink may face all of the openings. However, in this case, it is necessary to leave a considerable gap between the lower surface of the upper surface of the electrical component box and the upper surface of the heat sink. The electrical component box may have one opening on the upper surface.

[0017]

As is apparent from the above description, the electrical component box assembly according to the first aspect of the present invention is provided with an opening in the upper surface portion of the electrical component box which is formed of a flame-retardant material and accommodates electronic components. An aluminum heat sink is provided so as to face at least a part of the opening, and an electronic component is provided on the lower surface side of the heat sink. Through the opening, and the heat sink faces the opening, so that the radiant heat from the heat sink can be directly emitted to the outside through the opening, and thus the electronic component can be sufficiently cooled. .

Even if the electronic component ignites and a flame rises, at least a part of the opening on the upper surface of the electrical component box is closed by the aluminum heat sink, so that the flame leaks out of the electrical component box. Hateful. In particular, even if the electronic component on the lower surface side of the heat sink ignites, the flame from the electronic component is blocked by the heat sink and hardly exits through the opening. Therefore, fire spread can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electrical component box of an electrical component box assembly according to an embodiment of the present invention.

FIG. 2 is a plan view of the electrical component box assembly according to the embodiment of the present invention.

FIG. 3 is a perspective view of a printed circuit board and a heat sink.

[Explanation of symbols]

1 ... electrical component box, 2 ... electrical component box body, 3 ... front lid, 1
6 ... upper surface part, 17, 18, 19, 20 ... opening, 25, 2
6 ... heat sink.

Claims (1)

[Claims] 1. An electronic component formed of a flame-retardant material for accommodating an electronic component, and an opening (17, 18, 19, 2) in an upper surface portion (16).
An electronic component box (1) having an electronic component (1) having at least a part of the opening (17, 18, 19, 20). An electrical component box assembly comprising: an aluminum heat sink (25, 26) on which is mounted.