Ventilation – Having inlet airway – Including specific air distributor
Patent
1994-08-03
1996-02-13
Joyce, Harold
Ventilation
Having inlet airway
Including specific air distributor
454296, F24F 1306
Patent
active
054908132
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an air injection tube for injecting ventilating, cooling and/or heating air into a room in which the tube is installed. Such tubes, which may be made from an air-impervious, flexible material, comprise a great plurality of uniformly mutually spaced small openings defined in a peripheral zone extending along the length of the tube.
Tubes of this known type may be used for blowing fresh and/or heated air into a large room or hall, such as factory buildings, gymnasiums, etc.
An air injection tube of this type may, for example, be mounted in the upper part of the room or hall so that the air injection openings are directed upwardly and/or sidewise. For special applications the openings may also be directed downwardly. When ventilating and/or heating air is fed into the tube at a certain pressure above that of the atmosphere a high-velocity flow of primary air is directed outwardly through each of the air injection openings of the tube. Each such high-velocity air flow generates a surrounding zone with a subatmospheric pressure, which in turn induces an inflow of secondary air from the room towards the injection tube. The velocity of the primary air flows is reduced in response to the inflow of secondary air from the room in which the injection tube is installed.
GB-A-846,472 and GB-A-929,285 disclose an injection tube or air duct of the above type, wherein the openings defined in the tube are arranged in a pair of diametrically opposite rows. The tube may be divided into axial sections, and the mutual spacing of the openings in each row of openings may be smaller in sections adjacent to a closed end of the tube than in sections adjacent to an air inlet end of the tube. SE-B-212099 discloses an air injection tube which has a square cross-sectional shape and is located at and extends along a corner between the ceiling and an adjacent side wall of a room. This known air injection tube has a plurality of small, mutually spaced air injection openings which are arranged in longitudinally spaced groups or patterns. A longitudinally extending, slot-like air injection opening is positioned between each adjacent pair of groups of openings. Air is injected into the room through the groups of openings at a relatively low flow rate while the air injected through the slot-like openings has a substantially higher flow rate.
It is desired to obtain the best possible mixing of the injected primary air with the air present in the room without inducing uncomfortable draught therein.
The mixing of the primary air supplied through the injection tube and the air present in the room may be improved by increasing the pressure of the primary air supplied to the injection tube and, consequently, also the velocity of the primary air flows. However, this in turn increases the uncomfortable draught in the room.
The present invention provides an injection tube of the above type by means of which the mixing of primary air supplied through the injection tube may be substantially improved without increasing the uncomfortable draught in the room in which the injection tube is installed.
Thus, the present invention provides an air injection tube for injecting ventilating and/or heating air into a room in which the tube is installed, a plurality of small, mutually spaced air injecting openings being defined in the peripheral wall of the tube along at least one longitudinally extending wall zone of the tube and being arranged in at least two peripherally spaced rows of openings and in groups or patterns, which are mutually spaced along the length of the zone, the longitudinal spacing of adjacent groups or patterns substantially exceeding the mutual longitudinal spacing of the openings in each group or pattern of openings, and the injection tube according to the invention is characterized in that the tube wall zone in which the air injection openings are defined has a cross-sectional shape defining an arc of a circle, that the maximum angular spacing of the air injection openings in peripherally adjacent rows of ea
REFERENCES:
patent: 689739 (1901-12-01), Morill
patent: 2423241 (1947-07-01), Kurth et al.
patent: 3357088 (1967-12-01), Hoffman et al.
patent: 3719136 (1973-03-01), Criddle
patent: 4441402 (1984-04-01), Harris
patent: 5111739 (1992-05-01), Hall
Danielsen Frede
Jespersen Carsten
Joyce Harold
KE-Burgmann A/S
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