Patent
1983-11-21
1986-03-18
Bennett, Henry
49 31, 98 32, F23L 1700
Patent
active
045760888
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flap (or damper) or shutter for protecting against pressure waves equipment through which a gaseous or vaporous medium, particularly air, flows, according to the preamble of claim 1.
The components in ventilating and/or air conditioning plants, such as in particular, suspended-matter filters, but also heat exchangers, dampers and component housings and ducts themselves, must be protected from destruction by pressure waves and/or increased air velocity. A special problem, in this regard, is the response speed of the flap; the latter ought to have closed without any possibility of destruction of the components to be protected. Pressure wave protective flaps have particular importance in the supply and exhaust system of nuclear power stations. The inlet air may flow into the containment only in filtered condition and may leave the containment as exhaust air likewise only filtered. An exhaust air purification and filter system is described, for instance, in German Pat. No. 26 25 275; it has a multiplicity of suspended-matter filters 10 which are preceded and followed, respectively, by activated carbon filters 6, 13, and it includes further post-filters 15 which are connected to the activated carbon filters post-connected in the direction towards the exhaust-air chimney 18.
From British Pat. No. 569,013, a pressure wave protective flap of the type mentioned at the introduction hereto is known having a frame which can be mounted in a ventilating duct and to which slats, constructed as articulated flaps with V-shaped cross section and a swivel axis at the vertex, are, independently of each other, supported rotatably, about several mutually parallel axes and which, when a given air velocity is exceeded and/or in the case of increased air pressure, are acted upon, in the direction of closing and thereby close off the duct cross section automatically until the air velocity and/or the air pressure have dropped to normal value.
A V-shaped cross section is also shown by the articulated flap-like slats according to German Utility Model (DE-GM) 7 133 893 which relates to a ventilation window for housings of exposed transformer stations. In order to avoid the escape of hot or even burning gases through the ventilating window to the outside in the case of a short circuit, the articulated flap-like slats are supported on the narrow sides thereof by means of bearing pins in bearing holes of the frame in such a manner that they are swung by the internal excess pressure into a closed position, wherein they overlap each other. To avoid vibration or chattering of the free-swingingly suspended flaps, due to external influences, for instance, vibrations or also changing air pressure, the exposed edges of these articulating flap-like slats can be restoringly spring-loaded by a yielding force, specifically springs. Strip-shaped extensions of elastic plastic material at end-face plates having the bearing pins serve as the springs. It is, in particular, a disadvantage of these two known embodiments of protective pressure-wave flaps, that the individual slats exhibit complicated profiles and consequently have a considerable structural width as well as a relatively large weight. In the event of the occurrence of pressure-waves and increased air velocities, the reaction of the slats is therefore relatively sluggish. These known protective pressure-wave flaps are therefore not usable if the purpose is to protect sensitive components in ventilating and air conditioning installations such as suspended-matter filters, for example, spontaneously against mechanical destruction by occurring pressure-waves and increased air velocity. Such conditions prevail in particular, as already explained above, in nuclear power stations, the containment of which is ventilated via duct system; such conditions prevail if a defect in the pressure system of the containment occurs. Conventional overpressure protective flaps are relatively sluggish; they close generally only when an overpressure of 1.3 bar is built-up, which is sufficie
REFERENCES:
patent: 2965014 (1960-12-01), Lowery
patent: 3301168 (1967-01-01), Schindler
patent: 4167898 (1979-09-01), Barcant
Fitzner Klaus
Mathewes Wolfgang
Plitt Uwe
Bennett Henry
Greenberg Laurence A.
Kraftwerk Union Aktiengesellschaft
Lerner Herbert L.
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