JPH09191191A - Structure for cooling natural air cooled closed box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the max. temp. in a closed box by mounting metal pipes vertically with their openings up and down inside at least one of the side plates of the box to make uniform the heat in the box. SOLUTION: Metal pipes 2 composed of vertically extending C-shaped members with their openings 2a up and down are mounted inside right and left side plates 1a of a closed box 1 to form openings at the top and bottom in the box, thereby forming spaces connected from upper parts to down parts at the plates 1a. This causes a convection flow of the heated air produced in an electronic circuit package 4 in an internal space of the metal pipes 2 whereby the heat can be transmitted along the pipes 2 themselves from the upper part of the box 1 to the lower part by the thermal conduction to make the heat uniform in the box 1 to reduce the max. temp. in the box.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a natural air-cooled hermetically sealed cooling structure used in a communication device.

[0002]

2. Description of the Related Art A conventional hermetically sealed housing has a hermetically sealed structure in which upper, lower, left and right, front and rear surfaces are surrounded by metal plates. An electronic circuit unit is installed inside the sealed casing having such a structure, and an electronic circuit package is mounted therein.

[0003]

In the hermetically sealed case having the above-mentioned structure, the heat generated from the electronic circuit package is radiated from the case surface. Therefore, there is a problem that the cooling capacity of the housing is extremely low. Further, there is a problem that heat generated in the electronic circuit package easily stays in the upper part of the housing, and the upper part of the housing becomes hot.

[0004]

In order to solve the above-mentioned problems, the present invention extends vertically inside at least one of the side plates constituting the hermetically sealed casing so that the openings are vertically arranged. It is equipped with a metal tube.

[0005]

1 is an exploded perspective view of a hermetically sealed housing showing an example of an embodiment of the present invention. In the figure, reference numeral 1 denotes a hermetically sealed housing, and six surfaces, top, bottom, left and right, front and back, are surrounded by metal plates. Reference numeral 2 is a metal tube attached to the inside of the side plate of the closed casing.

In this metal tube 2, a U-shaped member is vertically extended so that its opening 2a is vertically arranged.
A plurality of the side plates 1a are attached inside the left and right side plates 1a of the closed casing 1, whereby a space having upper and lower openings inside the closed casing 1 and connected from the top to the bottom is formed in the side plate 1a. Will be. FIG. 2 is an explanatory diagram showing the operation of the closed casing of the embodiment described in FIG.

The heat generated from the electronic circuit package 4 mounted on the electronic circuit unit 3 installed inside the closed casing 1 rises to the upper part of the closed casing 1 by natural convection as shown by an arrow a. To do. A part of this heat is radiated from the surface of the closed casing 1 as shown by the arrow b, but a part of the heat passes through the inside of the metal tube 2 as shown by the arrow c and moves to the lower part. .

Further, a part of the heat moves to the lower side or the side plate of the closed casing 1 by heat conduction in the inside of the metal tube 2 itself as shown by an arrow d, and moves to the side plate. Is radiated from the surface of the closed casing 1 as indicated by an arrow b. In this way, since the metal tube 2 is attached to the inside of the side plate of the closed casing 1 so that the openings are vertically arranged, the heat generated in the electronic circuit package 4 is convected in the space inside the metal tube 2. At the same time, the metal tube 2 itself can be thermally conducted to move from the upper part to the lower part of the closed casing 1, so that the heat inside the closed casing 1 is made uniform and the maximum temperature in the closed casing 1 is lowered. Can be made.

Further, since the heat transmitted to the metal tube 2 itself is transmitted to the side plate of the closed casing 1, the side plate of the closed casing 1 can efficiently dissipate the heat, so that the temperature inside the closed casing 1 is lowered. be able to. FIG. 3 is an explanatory view showing another embodiment of the metal tube. Note that FIG. 3 is a view of the side plate of the closed casing 1 as seen from above.

In the embodiment described with reference to FIG. 1, the metal tube 2
In the above, a plurality of independent U-shaped members are used. However, as shown in FIG. 3A, a corrugated plate in which U-shaped members are connected may be used. Further, as shown in FIG. 3B, a pipe having a quadrangular cross section may be attached to the inside of the side plate of the hermetically sealed casing 1 so that the openings are vertically arranged. Further, although the heat conduction efficiency to the side plate of the closed casing 1 is lowered, the side plate of the closed casing 1 is a pipe having a circular cross section as shown in FIG. 3 may be attached in close contact with the inside of the closed casing 1, or as shown in FIG. 3 (d), a rounded corrugated plate may be attached in close contact with the inside of the side plate of the hermetically sealed housing 1 so that the openings are located vertically. May be.

Although the metal tube 2 is attached to the two side plates facing each other in FIG. 1, it may be attached to one of the four side plates or may be attached to three side plates. It may be attached to all four side plates.

[0012]

As described above, according to the present invention, since the metal tube is attached to the inside of the side plate of the hermetically sealed casing so that the openings are vertically arranged, heat is applied to the inside of the metal tube and the metal tube itself. It is possible to move from the upper part to the lower part of the hermetically-sealed housing, the heat inside the hermetically-sealed housing is made uniform, and the maximum temperature in the hermetically-sealed housing can be lowered.

Further, since the heat transmitted to the metal tube itself is transmitted to the side plate of the closed casing, the side plate of the closed casing can efficiently dissipate the heat, so that the temperature inside the closed casing can be lowered.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a hermetically sealed housing showing an example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of the closed casing of the embodiment described in FIG.

FIG. 3 is an explanatory view showing another embodiment of the metal tube.

[Explanation of reference numerals] 1 closed casing 1a side plate 2 metal tube 2a opening

Claims (1)

[Claims] 1. At least one of side plates constituting a hermetically sealed housing.
A cooling structure for a naturally air-cooled hermetically-sealed case, wherein a metal tube extending vertically so that openings are vertically arranged is attached to the inside of one side plate.