SU788461A1 - Device for cooling radio electronic units - Google Patents

Description

(54) DEVICE FOR COOLING RADIO ELECTRONIC

BLOCKS

one

The invention relates to the design of electronic equipment and can be used in cooling systems.

A cooling device is known, comprising a hermetic casing with a CEA disposed therein, a bellows chamber with relief valves, and a heat exchanger placed on the base. In the presence of vibration, a change in the volume of the bellows chamber causes pressure drops in the cooling system and the flow of the cooling medium fl.

This device does not allow to cool the equipment with a small value of the amplitude of vibration and in its absence.

The purpose of the invention is to increase the cooling efficiency.

The goal is achieved by the fact that the device for cooling electronic units, comprising a hermetic housing, a bellows chamber with relief valves and a heat exchanger, is provided with a heat insulating gasket, a hermetic chamber with a slide valve, and an additional bellows chamber installed inside the main bellows chamber and communicating with the housing through holes made in its wall, and the main bellows chamber is placed in the sealed chamber and communicates with it, as well as with the cavity of the casing through the overflow cells apane, the hermetic chamber communicating with the cavity of the casing and the heat exchanger separated from the casing by a heat insulating gasket, through a slide valve mounted with the possibility of interaction with the main bellows chamber.

The drawing shows the device, General view.

Sealed casing 1 contains a heat-loaded unit 2 with printed circuit boards 3

5 and elements 4. A guide rail 5 is attached to the edges of the boards 3, which serves to distribute the air flow between the boards. The casing 1 is connected on three sides through a heat insulating gasket 6

2Q a U-shaped flat heat exchanger 7 connected by a nozzle 8 to a hermetic chamber 9 adjacent to the surface of the casing 1 through a heat insulating gasket 10. In the chamber 9 there are additional

11 and 12 main bellows chambers of different diameters located concentrically one inside the other, the corrugated walls of which are made of durable elastic material and spring-loaded so that the additional chamber 11 has a slightly increased elasticity compared to the chamber 12. The chamber 11 communicates through the apertures 13 with the casing cavity 1, the chamber 12 through the bypass valve 14 communicates with the cavity of the chamber 9, and through the bypass valve 15 - with the cavity of the casing 1, which communicates with the heat exchanger 7 through the nozzles 16 and the spool valve 17, extreme The open and closed locks are electrically or mechanically connected to the extreme positions of the bellows chambers 11 and 12 when they are expanded and contracted. The bypass valves 14, 15 and 17 provide a hermetic separation of the cavities of the casing 1 and the heat exchanger 7, thereby creating a pressure differential during operation of the device.

The device works as follows.

In the initial position, the bellows chambers 11 and 12 are reduced to a minimum volume by the action of elastic forces, and the bypass valves 14, 15 and 17 are closed.

When the air is heated in the cavity of the casing 1 and cooled in the heat exchanger 7, a pressure differential is created between them, which varies in direct proportion to the temperature differential in constant volumes. Under the action of a pressure differential exceeding the resistance of the elastic forces, the additional bellows chamber 11 is expanded, entraining the main bellows chamber 12. The overflow valve 15 is reliably closed by pressure in the casing 1, and through the overflow valve 14 the cold air from the chamber 9 enters the main bellows chamber 12. The clearance of the air in the cavity of the casing 1 and, accordingly, the reduction of the volume of the sealed chamber 9 communicated with the heat exchanger 7, is accompanied by a further increase in temperature difference and a slight increase in The study of pressure differential due to the increasing resistance of elastic forces.

When the maximum expansion of the bellows chambers 11 and 12 is reached, the spool overflow valve 17 opens, the pressure in the casing 1 and the heat exchanger 7

the chambers 11 and 12 are equalized by the action of elastic forces, the cold air is forced out into the cavity of the casing 1, and the warmer air is displaced from the chamber 11 first of all, because it has a greater elasticity than the chamber 12. The cold air flow is distributed between the boards 3 by means of the guide lattice 5, partially displaces the hot air into the heat exchanger 7, and partially mixed with it, cooled

elements 4. At the same time, the cooled air from the heat exchanger is forced into the hermetic chamber 9. At the end of the contraction of the bellows chambers 11 and 12, the spool overflow valve 17 is closed and the cycle is repeated. As a result, in the casing 1, hot air is periodically replaced with cold air.

The elasticity of the bellows chambers and the degree of expansion of the air should be chosen such that the operation of the device is stable at a pressure drop of 0.1-0.2 bar and a maximum temperature difference between the air in the casing and the radiator is 10-15 ° C.

Claims (1)

Invention Formula A device for cooling the radioelectronic units, comprising a sealed casing, a bellows chamber with relief valves and a heat exchanger, characterized in that, in order to increase the cooling efficiency, it is equipped with a heat insulating gasket, an airtight chamber, a slide valve, and an additional bellows chamber installed inside the main body. bellows chamber, and communicating with the casing through holes made in its wall, and the main bellows chamber is placed in a sealed chamber and communicates with it, also the cavity housing through the bypass valves, wherein the sealed chamber communicates with the cavity of the casing and the heat exchanger, separated from the housing thermal insulation gasket, through the spool valve mounted to interwork with the main bellows chamber. Sources of information taken into account in the examination 1. USSR author's certificate in patent No. 2640645 / 18-21, cl. H 05 K 7/20, 07.07.77. // / 9 17 f6 / T