Ventilation device for a space zone

Details Ventilation device for a space zone Ventilation device for a space zone

1995-07-27

1997-11-25

Ford, John K.

Heat exchange

Structural installation

Related to wall, floor or ceiling structure of a chamber

454228, 454230, 454233, 454236, 454338, 92 34, F24F 100

Patent

active

056901658

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a ventilation device.
The increasing demand exists for ventilation devices. This applies in particular in the context of compact devices. They serve preferably for the thermodynamic treatment of ambient air of one or more spaces axes, in particular of an individual room or a space zone of such room/individual room. Such apparatus is employed by preference in office buildings and hotels. The advantage of such apparatus resides in the simple retrofitting of the rooms because in the case of an air treatment for, example, for heating or cooling purposes, it is merely necessary to provide an electricity and water connection to the extent that a mere air circulation operation takes place.
The known space ventilation devices of conventional construction comprise a fan which sucks in the air of the space and feeds it, for example to a heat exchanger. The air heated or cooled by the heat exchanger is then returned to the space due to the propelling action of the fan. A disadvantage is a relatively high noise level of the fan. Although motor noise can be damped substantially, if the motor is located in the air flow, the motor noise is unavoidably radiated as airborne sound, for example, in the case of compact compressor drums and axial ventilators with external rotor motors. Accordingly, the component contributed to the overall noise of the fan by the motor noise can only be reduced by the selection of a relatively silent, low vibration motor. Air flow noise generated by the impeller blades of the fan are always present. They can, however, be simply reduced by lowering the rotational speed. However, that results in an oversized fan. This causes the frequency spectrum to shift into a lower frequency region whereby the overall sensible noise level is slightly reduced. However, this causes a reduction of the efficiency of the motor because it operates far outside its designed range. Due to the required excess power of the motor, its construction size, its price and its heat output are also increased. Noise reduction in this manner can therefore, be effected only within narrow limits.
A further possibility of the airborne noise reduction lies in the use of silencers on the suction and pressure sides of the fans. This, however, excludes providing of a favorably priced compact device for one space axis or a plurality of space axes.
Accordingly, an object of the invention is to provide a ventilation device of the type as set forth in the introduction, which is of a simple construction, operates reliably, is favorably prices and, in particular, operates at low noise levels. In particular, a long life expectancy of 10,000-20,000 operating hours should also be attained.
This object is achieved according to the present invention by providing a ventilation installation, wherein the air propulsion plant conveys at least part of the air conveyed in a circulatory and pulse-wise fashion by means of at least one chamber the volume of which can be changed and which is connected to the space zone or a room by at least one air passage. This causes at least part of the conveyed air to be sucked in from the room by enlarging the volume of the chamber and to be returned back into the room again by reduction of the volume of the chamber. During the suction and/or the return movement, the air passes through the air passage. Surprisingly, it was found that the air suction and the subsequent expulsion of the air does not result in a "short circuit" even if the chamber is connected with the room only by a single air passage. Does not result in a "short circuit" means that the same air volume is not continuously sucked in and expelled again. This is possible due to the pulsating conveyance of the air, because the expulsion is effected with such an expulsion impulse that the expelled air is released as a vortex and penetrates into the space. During the subsequent air intake, new ambient air can, therefore, rush in. If, in accordance with a further embodiment of the invention, the ventilation device comprises air treatmen

REFERENCES:
patent: 472187 (1892-04-01), Brand
patent: 584154 (1897-06-01), Dunn, Sr.
patent: 2830675 (1958-04-01), Drager
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patent: 4952283 (1990-08-01), Besik
patent: 5016856 (1991-05-01), Tartaglino
Patent Abstract for JP 3249383 published Jul. 11, 1991, based on JP 90004970 applied for Feb. 28, 1990.

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