A device for generating an air wall comprises a primary blower slit for generating a flat primary air stream in a passage opening mutually separating two spaces with different temperatures. Two adjacent air streams with the same direction and speed are added to the primary air stream. The primary ai
A device for generating an air wall comprises a primary blower slit for generating a flat primary air stream in a passage opening mutually separating two spaces with different temperatures. Two adjacent air streams with the same direction and speed are added to the primary air stream. The primary air stream has a temperature between those of the secondary air streams. The absolute humidity of the air of the primary air stream is at least equal to that of the cold secondary air stream and lower than that of the warm secondary air stream. The air speed of the primary air stream amounts to at least 15 m/s. The width of the primary blower slit lies in the range of 15-40 mm. The length of the primary blower slit in the direction of the air stream lies roughly in the range of 5-40 cm, preferably 10-30 cm. No mixing occurs hereby occurs between the primary air stream Sp and the second secondary air stream Ss2 on the side of the warm space, whereby condensation (misting and vaporization) and/or sublimation (icing) is prevented.
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1. A device (3) for generating an air wall (4) for thermal separation of the air in a first relatively cold space (1) from the air in a second relatively warm space, which spaces are mutually connected by a passage opening (2), the device (3) comprising: a primary blower fan means (6), a primary blo
1. A device (3) for generating an air wall (4) for thermal separation of the air in a first relatively cold space (1) from the air in a second relatively warm space, which spaces are mutually connected by a passage opening (2), the device (3) comprising: a primary blower fan means (6), a primary blower unit (5) positioned on one side of the passage opening (2), substantially parallel to a main plane of said passage opening (2) and extending over a relevant dimension of said passage opening (2), said primary blower unit (5) having a primary blower slit (7) of a given length and width which receives an air stream from said primary blower fan means, said primary blower unit (5) arranged for generating an at least more or less flat primary air stream (8) directed at least roughly toward an opposite side of said passage opening (2);wherein said primary blower fan means (6) generates an air speed in the primary air stream (8) of at least 30 m/s; and the width of the primary blower slit (7) lies in the range of 15-40 mm;wherein the device (3) further comprises:a suction unit (11) positioned on an opposite side of the passage opening and having a suction slit (12) extending substantially parallel to the blower slit (7) and having a length which is substantially the same as the given length of the primary blower slit (7), said suction slit (12) subjected to an air stream directed as said primary air stream;a row of control valves (14) located in the suction slit (12), said control valves (14) distributed along an extent of said suction slit (12) so as to obtain a substantially constantly passing airflow;wherein a length of the primary blower slit 7) in the direction of the air stream lies in the range of 5-40 cma secondary blower unit (39) with a secondary blower slit (36) which connects thereto on the blower side, disposed adjacently of the primary blower slit and having the same length as the primary blower slit, anda heating unit (16) arranged to change a temperature of air blown out by the secondary blower slit (36) slit. 2. The device (3) according to claim 1, wherein the primary blower unit (5) further comprises: a cavity (9) to which the primary blower slit (7) connects, said cavity having a cross-sectional area in the range of 400 cm2 to 2000 cm2. 3. The device (3) according to claim 1, wherein the primary blower slit (7) is connected via a duct (10, 13) to the suction slit (12), in which duct the primary blower fan means (6) are disposed. 4. The device (3) according to claim 1, which further includes a catching unit (127) for ice crystals, wherein said catching unit (127) is placed in the downstream zone of the primary outflow and includes a filter with a mesh of 0.4 to 2 mm. 5. The device (3) according to any of claims 1-3 and 4, wherein the device (3) comprises a generally tubular, hollow portal (15), with the general form of an open U with two legs, one leg of which has a blower slit (7) and another leg a suction slit (12). 6. The device (3) according to claim 5, wherein the fan means (6) are present in a hollow portal (12) in an air circuit (24) between the slits (7, 12). 7. An assembly (30) of at least two devices (3) according to any of claims 1-3 and 4, which assembly (30) is disposed in a transit tunnel which connects sealingly to the passage opening (2), in which assembly (30) adjacent primary air streams (8) have opposing directions. 8. A method for generating an air wall (4) for thermal separation of the air in a first relatively cold space (1) from the air in a second relatively warm space, which spaces are mutually connected by a passage opening (2), the method comprising: providing;a primary blower fan means,a primary blower unit (5) positioned on one side of the passage opening (2) and having a primary blower slit (7) of a given length and width which connects thereto on the blower side, said primary blower unit (5) being disposed substantially parallel to a main plane of the passage opening (2) and extending over a relevant dimension of the passage opening (2), anda suction unit (11) positioned on the opposite side of the passage opening (2) and having a suction slit (12) extending parallel to the blower slit (7) and having the same length as the primary blower slit (7), the suction slit (12) having a row of control valves (14) distributed along an extent of said suction slit (12),said primary blower fan means generating an at least more or less Out primary air stream (8) directed at least roughly toward the opposite side of the passage opening (2);said suction slit subjected to an air stream directed as said primary air stream,providing two secondary air streams Ss1 (18) and Ss2 (19) in addition to the primary air stream (8) on either side thereof, which secondary air streams (18, 19) have substantia the same direction as the primary air stream (8); Ts1
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이 특허에 인용된 특허 (6)
Rohrer, Stephen R.; Endter, Joseph M., Air curtain doorway.
Sharma Sudhir K. (Stormville NY) Riley Michael F. (Danbury CT) Nowotarski Mark S. (Stamford) Barlow Alan R. (Stamford CT), Multi-layer fluid curtains for furnace openings.
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