JPH034072Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a cabinet in which a printed circuit board on which electrical components are arranged is housed.

[Prior art] Conventionally, some of the components installed on printed circuit boards generate heat, and if the temperature increases due to the heat generated by the components, performance will deteriorate, so consideration must be given to avoid placing heat-generating components in a concentrated manner. However, this resulted in inconveniences such as restrictions on the arrangement of parts.

For this reason, Japanese Patent Laid-Open No. 77300/1983 discloses a method in which a printed wiring board is bonded onto an aluminum plate to speed up heat conduction and improve heat dissipation. Japanese Utility Model Application Laid-open No. 60-49691 discloses a system in which the temperature is lowered by increasing the heat dissipation area and promoting heat dissipation.

[Problems to be solved by the invention] Boards and electronic devices equipped with the above-mentioned cooling mechanism are equipped with a fan that generates airflow inside the cabinet, so the amount of heat generated by the fan itself becomes a problem. When the heat generation density becomes high, heat dissipation cannot be done in time, resulting in a significant temperature rise, resulting in a disadvantage that the electrical characteristics change.

Therefore, in view of the above points, the present invention was developed to provide cooling for electrical equipment that efficiently cools the parts without changing their performance, does not deteriorate the performance of the parts, and is not subject to restrictions on the placement of power generation parts. It provides cabinets.

[Means for Solving the Problems] In order to solve the above problems, the cooling cabinet for electrical equipment of the present invention has a blower installed on the outer wall of the cabinet, and a corrugated metal fin that connects and holds two metal plates. Both side walls are formed by tapered heat sinks with the gap between the two metal plates of the heat sink having a narrower gap on the blower side and a wider gap on the other end, and two metal plates parallel to the both side walls in the middle of the both side walls. A central duct is formed by a tapered heat sink with the gap between two metal plates widened on the side where the blower is installed and narrowed on the other side opposite to the side walls, and a heat sink is attached to the printed circuit board between the side walls and the center duct. A multilayer printed circuit board with a heat dissipation plate that is polymerized and bonded is installed. And the blower is located in the central duct.
It is arranged on the outer wall of the cabinet so that air is blown between two metal plates, and the connection part between the heat sink of a multilayer printed circuit board with a heat sink and both side walls, and the connection part between the heat sink of the multilayer printed circuit board with a heat sink and the central duct. are connected so that air can flow through them.

[Function] The cooling air sent into the central duct by the blower is narrowed at the tip in the air blowing direction, so it flows smoothly between the heat sinks of the multilayer printed circuit board with heat sinks between the center duct and both side walls. As the cooling air passes through the heat sink of the multilayer printed circuit board with heat sink,
The heat generated from the attached parts is removed from the heated metal plate and fins, and is exhausted through the tapered heat sinks on both side walls. At this time, since the gap between the tapered heat sinks on both side walls is wide on the exhaust side, air flows down smoothly.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a perspective view of an air-cooled cabinet for electrical equipment according to the present invention. It is box-shaped. A central duct 18 parallel to both side ducts 19 is provided in the center between the side ducts 19 on both side walls, and both side ducts 19 and the central duct 1
8, the front wall plate 20, and the rear wall plate 21 are connected by brazing. A blower 16 is attached to the outer wall of the front wall plate 20 at approximately the center thereof.

The heat dissipation plate forming the side duct 19 and the central duct 18 that constitute the side wall has a metal plate 3 and a metal plate 4 arranged side by side, and a wavy metal fin 5 that maintains this space between the metal plates 3 and 4. It is a plate-shaped body with a The distance between the metal plates 3 and 4 is tapered such that the distance at one end in the longitudinal direction is narrow and the distance at the other end in the longitudinal direction is wide. In the side duct 19, this tapered heat dissipation plate 1B is arranged on the side where the interval between the metal plates 3 and 4 on the front wall plate 20 side is narrowed and the cross-sectional area is reduced, and in the central duct 18, the metal plate on the front wall plate 20 side 3,
4, and the side with a larger cross-sectional area is arranged. Further, a discharge port (not shown) is provided at the connection portion of the rear wall plate 21 with the side duct 19.

A multilayer printed circuit board 8 with a heat sink 1A is mounted between the side duct 19 and the center duct 18 on the front wall plate 20.
be placed parallel to the The multilayer printed circuit board 8 with a heat sink has a heat sink 1A on an insulating multilayer printed circuit board 9.
are adhered, polymerized, and integrated. Heat sink 1
In A, two metal plates 3 and 4 are arranged in parallel, and a fin 5 is interposed between the two metal plates 3 and 4.

Components 11 are arranged on the upper surface of the heat sink 1A of the multilayer printed circuit board 8 with a heat sink as shown in FIG. A small hole is drilled in the multilayer printed circuit board 8 with a heat sink, and an epoxy insulating material 13 is inserted into the small hole of the heat sink 1A, and the legs 12 of the component 11 are inserted into the small hole through the through-hole plating 15. , connect it to the printed wiring and fix it by means such as soldering.

Multilayer printed circuit board 8 with 19 side walls and heat sink
The connecting portion between the center duct 18 and the multilayer printed circuit board 8 with a heat sink is provided with a communication hole so that air can flow from the tapered heat sink to the heat sink 1A of the multilayer printed circuit board 8 with a heat sink. Connect. Further, the air outlet of the air blower 16 is connected between the metal plates of the tapered heat sink of the central duct 18.

The operation of the cooling cabinet for electrical equipment constructed in this way will be explained.

The blower 16 is operated to send cooling air between the metal plates of the central duct 18. At this time, blower 1
Since the blower 6 is mounted on the outside of the cabinet, the inside of the cabinet will not be affected by temperature rise due to heat generated by the operation of the blower 16. Cooling air enters the heat sink 1A of the multilayer printed circuit board 8 with each heat sink from the central duct 18, and then passes through the side duct 1.
It is exhausted through 9. The front wall plate 20 side of the central duct 18 has a large cross-sectional area, and the rear wall plate side is narrowly closed, so that cooling air can smoothly flow into the heat sink 1A of the multilayer printed circuit board 8 with a heat sink. Further, since the side duct 19, which is the side wall, is narrow on the side closer to the front side wall 20 and widened on the outflow side, the air in the side duct 19 flows down quickly and smoothly.

When the component 11 disposed on the multilayer printed circuit board 8 with a heat sink generates heat, the heat is conducted to the metal plates 3 and 4 of the heat sink 1A, which have excellent thermal conductivity, and further,
It is conducted to the metal fins 5. The wide contact surface of the wavy fins 5 inside the heat sink 1A hits the cooling air flowing through the heat sink 1A, and heat is removed therefrom. Furthermore, the metal plate 3 of the side duct 19 which is the side wall,
The heat transferred to the fins 4 and fins 5 is also actively radiated by the air flow. This cooling air flow is rapid and is discharged smoothly, so there is no heat accumulation in the heat sink 1A, and even if heat-generating parts are arranged in a concentrated manner, heat dissipates quickly and is prevented from rising due to temperature rise. The deterioration of component functions that occurs does not occur.

[Effects of the invention] The cooling cabinet for electrical equipment of the invention transfers the heat generated by the electrical components arranged on the multilayer printed circuit board to the metal plate and fins of the heat dissipation plate, which have excellent thermal conductivity. The cooling efficiency is high because the cooling air sent from the blower immediately cools the inside of the heat sink. In addition, the heat sink that forms the central duct is tapered to allow cooling air to smoothly flow into the heat sink of the multilayer printed circuit board with a heat sink, and the heat sink that forms both side walls is designed to have a tapered surface. The wide structure allows for rapid air circulation, so the cooling effect is large, and even if there is a large amount of heat generated from the parts, the temperature inside the cabinet will not rise.

Furthermore, the heat generated by the blower operation of the blower disposed outside the cabinet does not affect the inside of the cabinet.

In this way, by efficiently cooling the inside of the cabinet, it is possible to prevent performance deterioration or change in the performance of parts, and since the heat sink is superimposed on the multilayer printed circuit board and the cooling air passes through the heat sink, Even if the heat generation density of the components is high, heat dissipation is ensured, and unlike conventional printed circuit boards, there are no restrictions on component placement.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a sectional view showing how parts are attached. 1A... Heat sink, 1B... Tapered heat sink,
3, 4...metal plate, 5...metal fin, 8...
Multilayer printed circuit board with heat sink, 9... Multilayer printed circuit board, 11... Parts, 16... Air blower, 18...
...Central duct, 19...Side duct.

Claims (1)

[Claims for Utility Model Registration] Both side walls formed of heat sinks each having two metal plates and a wavy metal fin that connects and holds the metal plates together, and a printed circuit board disposed between the two side walls. and a blower for blowing air between the metal plates of the heat sink, wherein a central duct made of the heat sink is disposed parallel to the both side walls and between the side walls, and the outer wall of the cabinet is A blower for blowing air is arranged between two metal plates of the central duct, and the gap between the two metal plates of the central duct is widened on the side of the wall where the blower is installed, and the wall corresponding to the wall is widened. A tapered heat dissipation plate with narrow sides is used, and the interval between the two metal plates of the heat dissipation plate forming the both side walls is narrow on the side of the wall where the blower is installed.
The wall side corresponding to the wall is a tapered heat sink with a wide structure, and between the both side walls and the central duct is a multilayer printed circuit board with a heat sink in which the heat sink is polymerized and adhered to the printed circuit board. A connecting portion between a heat sink of the multilayer printed circuit board with a board and the both side walls and a connecting portion between the heat sink of the multilayer printed circuit board with a heat sink and the central duct are connected so that air can circulate. Air-cooled cabinet for electrical equipment.