Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1986-06-27
1988-03-08
Pellinen, A. D.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
361391, H05K 720
Patent
active
047302330
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The invention relates to an arrangement for cooling circuit boards that are positioned in a magazine in a cabinet, in which arrangement air flows between the boards.
BACKGROUND
In modern telephone stations, for example, a large number of magazines containing circuit boards are used, air flowing between the boards to take away the heat generated by the circuit board components. The air can be caused to flow by convection, a draft thus occurring as warm air rises. Forced cooling may also be used, and implemented by mechanical means such as a fan which preferably reinforces the convection draft.
In such an arrangement, a problem may exist that the cooling of certain circuit boards may be insufficient, even if the total air flow through a magazine is nominally large enough. This may result from the fact that whereas the air flows passing close to all the circuit boards are substantially equal, the boards may generate different amounts of heat.
The risk of components or certain boards becoming too hot, and thus being damaged, is especially large if the magazines are placed in a closed cabinet. Further, if a fan is used to increase the air flow, it must be powerful enough to insure that the boards generating the most heat will be sufficiently cooled. Such a fan requires energy as well as space, and can also cause troublesome noise.
SUMMARY OF INVENTION
The object of the present invention is to provide an arrangement of the kind mentioned above, with which the air flows passing along different circuit boards in a magazine may be adjusted to the required cooling effect in response to the heat generation of the respective boards.
This is achieved by the provision of a regulator plate which is assigned to each magazine, and provided with a plurality of holes or slots which, dependent on their sizes and positions, distribute the flowing air in a suitable manner.
BRIEF DESCRIPTION OF DRAWING
The invention will next be described in detail with reference to the drawing in which:
FIG. 1 illustrates a magazine for circuit boards;
FIG. 2 represents a cabinet in cross section and containing a plurality of magazines, one above the other; and
FIG. 3 illustrates an inventive regulator plate associated with a magazine provided in accordance with the invention.
DETAILED DESCRIPTION
A magazine for circuit boards is illustrated in FIG. 1. The magazine is denoted by the numeral 1, and has a number of places each intended for a board. For the sake of clarity, only two boards 2 are shown, and these are thrust into and thereby positioned in adjacent places. Such magazines are intended to be in side-by-side arrangement and at different levels above each other in apparatus such as modern telephone exchanges. The magazine is open at top and bottom so that air can pass between the boards and thus lead off the heat generated by components on the boards.
In FIG. 2, there is shown a number of magazines 1, seen in elevation in a cabinet 3. The magazines are placed one above the other at their different levels in the cabinet, in such a way that air can flow between the boards from the bottom of each magazine to its top, or vice versa. The so-called back-planes to which the circuit boards are connected are denoted by 4. The air can flow by free convection or with the aid of a fan 5. The air is supplied, e.g. via unillustrated ducts opening at the sides of the cabinet, and flows upwards in the illustrated embodiment through the magazines via special plates 6, which will be described in connection with FIG. 3. The air that has flowed through a magazine is fed by sloping plates 7 to a flue 8, through which it is led out of the cabinet.
In FIG. 3, there is illustrated an embodiment of a regulator plate 6 of which there may be a plurality, each such plate being associated with its respective magazine. Each plate is manufactured specifically for its associated magazine, taking into consideration the circuit boards included in the magazine. The illustrated regulator plate is provided, for example with a plurality of thr
REFERENCES:
patent: 3387648 (1968-06-01), Ward et al.
patent: 4093021 (1978-06-01), Groom
patent: 4277815 (1981-07-01), Skroupa
Pellinen A. D.
Telefonaktiebolaget LM Ericsson
Thompson Gregory D.
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