SU1637048A1 - Radioelectronic equipment unit - Google Patents

Abstract

The invention relates to electronics and can be used in the design of electronic components with a large number of modules of high power. The purpose of the invention is to improve the technological design and density of the arrangement due to the fact that in the electronic unit containing the opposite heat dissipating bases 1 with the fins 2 on their inner surfaces and the printed circuit boards 3 with the heat dissipating plates 4 ; amp; 90 ° to the sides of the base 1. The heat-removing plates 4 are fixed on the side surfaces of the fins 2 with screws 7, the head diameter d of each of which is selected from the d d ratio -: -) COS a, where a is the pitch is placed - fv sin & i no printed circuit boards, mm; S is the total thickness of the rib and the heat sink plate fixed on its side surface, mm; a is the angle between the rib and the corresponding side of the heat sink base, ang. hail. 2 Il.

Description

FIG. I

The invention relates to radio electronics and can be used in the design of electronic components with a large number of modules of high power.

The purpose of the invention is to improve the technological design and density of the layout.

FIG. 1 shows the heat-removing base of the electronic unit with printed circuit boards attached to it, top view; in fig. 2 is a section A-A in FIG. one.

The electronic unit contains opposite heat-conducting bases 1 with ribs 2 on their inner surfaces facing one another, printed-circuit boards 3 with heat-removing plates 4. Ribs 2 are placed at an angle a & 90 ° to - two opposite sides 5 and 6 of the heatsink base. 1. Heat-removing plates 4 are fixed on the side surfaces of the ribs 2, with screws 7 being used as fastening elements.

The diameter d of the head of each screw 7 is chosen from the ratio

M (

where a is the step of placing the printed circuit boards, mm,

S is the total thickness of the rib and attached to its lateral surface of the heat removal plate, mm;

a is the angle between the rib and the corresponding side of the heat sink base, coal. hail.

Between the contacting surfaces of the heat-removing plates 4 and the fins 2 a layer 8 of heat-conducting paste is displaced.

Electronic unit works as follows.

On the fins 2 of the heat-removing bases 1 the heat-removing plates 4 are fixed.

printed circuit boards 3 with screws 7. The heat flux from the elements of the printed circuit board 3 through the heat-conducting plate 4, the heat-conducting fins layer 8 is transferred to the fins 2 of the heat-removing base 1 and spreads to the surrounding medium.

The invention allows to increase the density of the layout and manufacturability of the design; and also provides effective

their cooling.

Claims (1)

Invention Formula Electronic unit containing opposing heat-removing bases with fins on their inner surfaces facing one another, between their two opposite sides, respectively, printed circuit boards with step-down plates fixed on the edges of the bases by means of fastening elements with the possibility of their thermal contact with the corresponding edges of the heat-removing bases, differing in the fact that, in order to improve the technological design and density of the layout, the edges of each heat-removing base are placed at an angle a to two respective opposite sides, the heat-removing plates of printed circuit boards are fixed on the side surfaces of the ribs, and screws are used as fastening elements, the diameter d of the head of each of which is selected from the following relationship: 0 d (a TO; ) cosal. sin a pitch printed where a - boards, mm; S is the total thickness of the rib and attached to its lateral surface of the heat removal plate, mm.