SU1104695A1 - Electronic module with accessory circuit cards - Google Patents

Abstract

RADIO-ELECTRONIC MODULE WITH REPLACEMENT BOARDS, containing heat-loaded boards, between which heat exchange chambers are installed with the possibility of thermal contact with the boards, characterized in that, in order to increase cooling and maintainability, at least one heat exchange chamber is fitted with at least one pair of corrugated plates installed inside it. plates, on the corrugations of which evenly alternate cuts are made, with the cuts of one corrugated plate and the cuts of the other are arranged in a checkerboard pattern, gof The ripped plates are facing one another towards the corrugations and fixed to the inner walls of the heat exchange chambers by the Gofr vertices with the possibility of interaction between their bases. (L

Description

The invention relates to radio electronics, and more specifically to the arrangement of liquid cooled modules containing replaceable heat loaded boards. Designs of radio-electronic modules cooled by a fluid that flows inside a heat exchanger, which is a closed chamber made of an elastic heat-conducting material, with heat-generating elements pressed against the side surfaces are known. The efficiency of heat removal in such designs is determined by the quality of the thermal contact between the wall of the heat exchange chamber and the heat loaded boards l. The constructions of heat-exchange chambers are made of heat-conducting elastic material (heat-conducting rubber). Reliable thermal contact between the walls of the heat exchange chamber and the elements to be cooled is carried out due to the overpressure of the refrigerant inside the heat exchange chamber while the system is running. The disadvantage of the design is the impossibility of replacing the cooled elements when the system is running (in the presence of excess pressure inside the heat exchange chamber) due to the low mechanical strength of the material of the wall. Closest to the present invention is a device in which a radio electronic module contains a closed flat heat exchange chamber, to which heat-loaded plates are pressed onto both sides with screws. The walls of the heat exchange chamber, contacting with the boards, are made of flexible heat-conducting material, which ensures good thermal contact between the chamber walls and the boards in the presence of excessive refrigerant laziness inside the heat exchange chamber 2j. A disadvantage of the known construction is the impossibility of replacing the outdated heat-loaded boards in the presence of excess pressure inside the heat exchange chamber. This is caused by the fact that the heat exchange surface on the refrigerant side in this design is undeveloped, flat, therefore, to ensure high values of heat transfer coefficient to the refrigerant, significant flow rates are required (high refrigerant costs), thus creating a significant overpressure in the chamber. If the boards are disconnected, the thin wall of the heat exchange chamber may be destroyed due to internal overpressure. The purpose of the invention is to increase the cooling efficiency and maintainability. This goal is achieved by the fact that in an electronic module with interchangeable boards containing heat-loaded boards, between which heat exchangers are installed with the possibility of thermal contact with the boards, each heat exchange chamber is equipped with at least one pair of corrugated plates installed inside it, on the corrugations of which uniformly alternating the cuts, the cuts of one corrugated plate and the cuts of the other are arranged in a checkerboard pattern, the corrugated plates are facing corrugations one towards Another one is fixed on the inner walls of heat exchange chambers by the tops of the corrugations with the possibility of their interaction. FIG. 1 shows the module with plug-in cards, general view; in fig. 2 heat exchange chamber with corrugations in the absence of excessive pressure in the chamber; in fig. 3 - the same if available; in fig. 4 - corrugated plates. The electronic module (Fig. 1) contains a heat exchange chamber 1 fixed permanently in the electronic unit for connecting flanges 2 on the choke covers 3. The choke covers are fitted with guides 4 with symmetrically arranged bevels 5. Heat-loaded electronic boards 6 are pressed to the side surfaces of the heat exchange chamber by means of wedge clamps 7, screwed by screws 8. The heat exchange chamber 1 is made in the form of a flat pipe 9 made of thin heat-conducting sheet material, for example, aluminum alloy, t 0.5-1.0 mm thick, inside of which are corrugated plates with cutouts. The cuts of the plates are arranged in such a way that when assembling the structure of the remaining parts of the peaks, 10 corrugations of each of the plates pass through the cuts of the opposite plate 31

tina. The height of the corrugated plates should be more than half the height of the inner cavity of the chamber by the amount of necessary movement of its flat walls. When installing the plate assembly inside the heat exchange chamber, a gap is formed between the bases of the corrugations 11 of the corrugated plates. When moving the walls of the heat exchange chamber under the action of the internal overpressure of the base, the corrugations 11 interact with each other, thereby limiting the possibility of moving the walls of the chamber due to the fact that the tips of the corrugations are rigidly attached to the inner surfaces of the walls.

The installation of the electronic board in the module and the unit is carried out as follows.

The wedge clamps 7 (Fig. 1) are diluted with screws 8, the board 6 is inserted into the resulting gap between the clamps 7 and clamps 3 before connecting the plug and socket of the electrical connector, after which the board 6 is pressed against the side surface of the covers 3. A slight the gap between the wall of the heat exchange chamber 1 and the plane of the board 6 When the module is turned on in the operating mode in the internal cavity of the heat exchange chamber, the liquid cooling system pump creates an overpressure of the refrigerant, under the action of which its thin Tenko tightly pri954

are pressed to the surface of the heat-loaded boards. To replace one of the boards, the clamps 7 are separated with screws 8, while the wall of the flat pipe

9 (Fig. 2) is perpetuated until the gap between the bases of the corrugations 11 and the load from the excessive internal pressure on the side walls of the chamber take on corrugated plates. After that, the board can be freely removed from the rails. When the board is reinstalled, the thermal contact between the surface of the board and the wall of the heat exchange chamber is restored with the help of wedge 39ZHIMOV, 7, which are screwed by screw 8.

The use of the invention expands the field of application of the heat exchanging device, since when replacing individual outdated boards during operation of the cooling system, the rest of the cooled equipment is operated. In this case, the duration of the most severe start-up {modes, which increases the service life of the equipment and increases its reliability, decreases. In addition, due to the development of the heat exchange surface on the refrigerant side, the removal of equal amounts of heat is provided in the proposed structure. operation at lower refrigerant costs, which reduces energy consumption and improves the overall size of the cooling system.

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Claims (1)

RADIO ELECTRONIC MODULE WITH REPLACEMENT BOARDS, containing heat-loaded boards, between which heat-exchange chambers are installed with the possibility of thermal contact with the boards, characterized in that, in order to improve cooling efficiency and maintainability, each heat-exchange chamber is equipped with at least one pair of corrugated plates installed inside it, on the corrugations of which uniformly alternating cuts are made, moreover, the cutouts of one corrugated plate and the cutouts of the other are staggered, corrugated These plates face the corrugations one to the other and are fixed on the inner walls of the heat exchange chambers by the corrugations peaks with the possibility of interaction between their bases.