EP0657702B1 - Arrangement for producing two air curtains moving in opposing directions - Google Patents

Abstract

In an air-curtain apparatus for doors, two circulating-air currents (14,15) rotating in opposite directions are produced with the aid of two blower devices (7,8). The direction of rotation of the two circulating-air currents (14,15) is chosen so that an upwardly directed air flow arises between the two circulating-air currents (14,15). This results in air which penetrates from outside being able to pass into the room interior (1) only via one of the blower devices (8) and thus being adequately conditioned. <IMAGE>

Description

Air curtains are used when on open doors or gates to prevent outside air from entering the room or an escape of room air to the outside should be prevented. An order to such Generating gate air curtains is known from DE-PS 30 50 685 known. There is a high pressure fan in the housing, its suction side to an air inlet and its Pressure side is connected to an ejector nozzle. The Ejector nozzle is used to create an induction air jet generate the with another fan from the air outlet blown air over the entire gate height to be able to transport. This so-called primary air is expelled from the air outlet at a lower pressure and wouldn't go far without the induction air jet enough to reach the ground.

It is also located in the flow path between an air conditioning device for the air inlet and the air outlet, around both the temperature and if necessary, the humidity of the blown air to be able to adjust.

The known device is used in such a way that its air inlet faces the interior of the room, while the air outlet with the ejector nozzles from above is directed downwards parallel to the door opening. Thereby creates an air roller during operation, whose air flow near the floor from the door opening to the Interior is directed, as is also the case in the essay "Energy saving through the use of air curtain systems" in the magazine "Ki air conditioning cooling heating", 9/1983 is described.

The known device works satisfactorily as long as than the pressure inside the room the pressure of the Atmosphere outside the room corresponds. However, as soon as in the room more ventilation facilities effective or there is thermal buoyancy a negative pressure and the air curtain is no longer in able to penetrate outside air through the air curtain to prevent through. Rather, it flows near the bed due to the air flow directed there accordingly the air roller of the air curtain outside air one that creates a cold air lake next to the door.

This type of airflow also creates a Air roller reaching far into the space to be protected.

One has therefore already tried, as also in the essay "Energy saving through Use of air curtain systems "in the magazine" Ki Air-conditioning-heating ", 9/1983 is explained, the known Mount device the other way around, so that the air roller on the floor no longer towards the inside of the room, but outside is directed. This arrangement has with pressure equalization between the inside of the room and the outside atmosphere the disadvantage of relatively large heat losses because below the top edge of the door into the air intake constantly Outside air is sucked in, which when blowing out of the Gate air curtain for increasing the pressure inside the room leads, so that there is an overpressure inside the room that pushes the air curtain outwards. Vice versa If there is negative pressure inside, there is an additional one Outflow of outside air as supply air into the room self.

The outside air that is constantly sucked in increases compared to the previously explained variant Energy expenditure for tempering the air curtain. The Energy consumption is about twice as large as the first Variant if the same interior temperature and one Temperature difference between inside and outside of approx. 10 up to 20 K is assumed.

Another embodiment known from practice provides for the use of two air curtains, to improve the shielding effect, the one on the inside of the door and the other on the Outside of the door is attached so that both Gate air curtain air rollers with opposite Generate sense of rotation, the descending air flow occurs between the rollers. This means that Gate air curtain located on the outside constantly sucking in cold outside air and consequently this Air curtain provide a great heat output must, because the downward flowing air from this air curtain must have about the same temperature as that with air curtain supplied to the room air. Otherwise If the room was under vacuum, the colder air would come out of the external air curtain is sucked into the room as drafts become. This supply air flow would be under the air roller of the inner air curtain on the floor and again in the neighborhood of the door Create cold air lake.

The energy requirement is about the same like a simple air roller, which is on the ground is directed outside.

Finally, it is from the essay "Cold Air Block through warm air curtains ", in" sanitary technology ", No. 2/1961 known two opposing air bells to use, with the upward flow occurs between the two air bells. To do this a common fan and a common heating device used to generate both air bells. The energy required to heat the circulated air is therefore at least as large as the one at the top as first discussed embodiment.

The facility shown in this magazine functionally does not differ from the arrangement according to EP 0 511 576 A2 or the air curtain system according to US-A-3 023 688. In both cases both air rollers have the same air temperature, resulting in one leads to significant energy loss.

Similar to the cold air lock explained earlier the device works through warm air curtains according to US-A-3 023 688. Also with this device are above the airlocked gate two blowers arranged, each for creates a roller-shaped air curtain. The roller-shaped Air curtains have the opposite direction of rotation and create an upward between them Air flow. In the known device are in heaters provided in both flow paths. On this way, not only does it become the interior of the room Air curtain kept at temperature but also the external air curtains, resulting in a significant Energy demand leads. Since this arrangement is not basically from the cold air lock previously explained distinguished by warm air curtains is the energy requirement correspondingly high.

Proceeding from this, it is the object of the invention an arrangement for generating a door or gate air curtain to create that even with negative pressure inside the room effectively prevents cold outside air from entering and has a lower energy requirement.

This object is achieved by the arrangement solved with the features of claim 1.

As a result of using the two blower devices two air rollers are generated, the opposite have direction of rotation. The blower equipment are arranged so that the rising air flow occurs between the rollers. This arrangement works the door air curtain directly adjacent to the door like a single gate air curtain according to the state of the art, i.e. the at high speed expelled air flows directly at the door opening down and gets on the ground towards that Inside the room and shortly thereafter redirected upwards. This The arrangement is for pressure equalization between the interior of the room and the outside atmosphere already extraordinary effective. The internal air roller flows in the opposite direction, though because of the reverse running air roller the door from the inner air roller no air to the outside can penetrate.

As a result of the operational independence of the two Blower devices need the outer blower device not to be heated without doing so a deterioration in comfort in the interior is coming. On the contrary, it tracks on the inside air flowing down to a less far inside reaching air roller and thus to a lower Air movement near the screened door opening. The heating energy requirement is reduced to around 60% with a gate air curtain with simple Air roller, which is directed inwards on the ground. The outer unheated air roller shields the inner heated Air roller and thus prevents heat loss to the outside.

In case of negative pressure in the room as a result of there working ventilation or ventilation equipment takes place through the open door and the air curtains constant pressure equalization. The cold coming from outside Air is thereby from the outer air roller to the Blower devices managed and divided into one Share that is fed into the outer air roller and another portion that goes into the inner air roller reached. Because this portion before entering the Interior of the room by the air conditioning device inner second blower device is running here penetrating outside air heated so far that none Tensile effect occurs.

Depending on the spatial conditions, the Blower devices either spaced apart be, for example, in a kind of windscreen, with between the two air curtain systems a considerable one Distance is, or the blower equipment can be accommodated in a common housing. In the case of shared accommodation in one Housing can also combine the two air intakes into one common air inlet.

According to the width of the door are next to each other optionally several first and second blower devices arranged.

Fig. 1 eine Anordnung mit zwei in einem Gehäuse untergebrachten Gebläseeinrichtungen in einer schematisierten Seitenansicht bei Druckausgleich,

Fig. 2 die Anordnung nach Fig. 1 bei Unterdruck im Raum,

Fig. 3 die Anordnung der Gebläseeinrichtungen bei räumlicher Trennung in einer schematisierten Seitenansicht und

Fig. 4 eine der Gebläseeinrichtungen in einem stark schematisierten Längsschnitt.

In the drawing, an embodiment of the object of the invention is shown. Show it:

1 shows an arrangement with two blower devices accommodated in a housing in a schematic side view with pressure equalization,

2 the arrangement of FIG. 1 with negative pressure in the room,

Fig. 3 shows the arrangement of the blower devices with spatial separation in a schematic side view

Fig. 4 one of the blower devices in a highly schematic longitudinal section.

Fig. 1 shows a in a highly schematic form Room 1 of a building covered by a floor 2, a ceiling 3 and a wall 4 surrounding it on all sides is bounded. In the wall 4 is at one point an open door or gate opening 5 from the floor 2 extends to a lintel 6 that extends from the ceiling 3 is spaced. 1 is located on the right from the wall 4 the interior of the room, to the left of wall 4 is "outside".

Above the lintel 6 are a first and one second blower device 7, 8 side by side on the same Height attached. The first blower device 7 has an air outlet 9, which is next to the lintel 6 is directed down towards the bottom 2. The first one points further to the interior of the room Blower device 7 has an air inlet on its underside 11, over which it sucks in air, which then over the aforementioned air outlet 9 is blown out.

The second blower device 8 has the same structure, but is built in mirror image, i.e. their air outlet 12 is further inside than you Air intake 13.

Both blower devices are expediently 7 and 8 designed so that their air inlets 11, 13 or air outlets 9, 12 over the entire width of the door 5 extend. If not for design reasons is possible, there is also the possibility along the Lintel 6 several first blower devices 7 and to provide a plurality of second blower devices 8 next to one another, thus the width of all air outlets 9, 12 and Air inlets 11, 13 together approximately the width of the door 5 corresponds.

When the blowers 7, 8 are started they create two side by side Air rollers 14 and 15. The air roller 15 consists of a blown out of the air outlet 9 onto the floor 2 Airflow 15 that is near the bottom 2 at 17 in Is diverted towards the interior of the room and then as an ascending air flow 18 to the air inlet 11 returned, i.e. the air roller 15 circulates to the illustration in Fig. 1, clockwise while the air roller 14 due to the mirror image Arrangement of the blower device in the counterclockwise direction running. Your airflow 19 directed towards the floor 2 is the furthest towards the interior of the room or in other words farthest from door 5 and will at 21 in the direction of the door 5 to then redirected as an upward air flow 22 to the air inlet 13 to get back.

With pressure equalization between the interior of the room and outside the air roller 14 on the door 5 prevents one Air exchange between outside and inside. The air roller 15 on the other hand, the expansion of the air roller 14 limits Interior because of the descending air flow 19 with the higher speed and thus the greater directional stability in any case the size of the air roller 14 limited to the interior of the room. This already results in a short distance from the door 5 practically draft free Indoor climate conditions or, in other words, the room air is a short distance from this one Gate air curtain system forming arrangement of the two Blower devices 7 and 8 soothes or low flow.

If in room 1 an additional ventilation device is provided, arises in room 1 opposite outside a negative pressure that is striving for outside air suck into room 1. This creates one Air flow, as illustrated schematically in Fig. 2 is. Because of the negative pressure one gets from the outside coming airflow 23 between the air roller 14 and the Floor 2 through the door opening 5. That airflow 23 is determined by the direction of rotation of the air roller 14 favors. But since the air roller 15 clockwise and thus against the direction of rotation of the air roller 14 runs, prevents the prevailing on the floor 2 Air flow 21 with its component directed towards the door 5 that the air flow 23 continues unhindered in the Room 1 can penetrate. Instead, the airflow 23 captured between the two air rollers 14 and 15 and up to the two blower devices 7 and 8 made. Depending on the pressure conditions, this is from outside air stream 23 now predominantly into the second Blower device 8 sucked in and can only after passing the blower device 8 through the air outlet 12 penetrate into the room like this through Arrows 24 is indicated.

There, as will be explained below, the second Blower device 8 an air conditioning device contains the flow between the air inlet 13th and the air outlet 12 is arranged, the outside air passes 23 only after temperature and Moisture is set to corresponding values as Air flow 24 the interior of the room. So is also at negative pressure in room 1 through the new arrangement ensures that no outside air immediately without Conditioning reaches the interior of the room.

The first blower device 7 does not need an air conditioning device, because it is supposed to be the inner air roller shield from the outside. Furthermore, the amount of air per unit of time of the outer air roller less than with the inner one, which is adjacent to the room Air roller.

1 and 2 are the two blower devices 7 and 8 arranged directly next to each other. They can also be shared if necessary Housing be housed, the common Air intake between the ends of the case lying air outlets.

It is essential in the new embodiment that the two blower devices 7 and 8 designed so are that for the outer air roller like that from the first Blower device 7 comes, no heating energy expended unlike the inner air roller. I.e. the two blower devices 7 and 8 are at least with regard to the heating of the air rollers in terms of ventilation essentially independent of each other.

In addition to the immediately adjacent attachment of the two blower devices 7 and 8 is also spatially spaced attachment possible, as shown in FIG. 3 shows. With this arrangement, the room contains 1 at a distance from its outer wall 4 with the door opening 5 to Located inside the room is another wall 25 with a own door opening 26, which is on its upper edge by a Lintel 27 is limited. The first blower device 7 is, as in the embodiment of FIG. 1, oriented above the lintel 6 towards the interior of the room attached. The air outlet 9 is directly the Door opening 5 adjacent.

The other blower device 8, however, is at a distance from the first blower device 7 on the wall 25 attached above the lintel 27, on that Side facing the outer wall 4. The real thing 3 inside to the right of the Partition 25 is located, thus contains no blower devices more. The second blower device 8 on the Partition 25 is attached such that its air outlet 12 creates an air curtain, the door opening 26 immediately is directed adjacent to the floor 2. Hereby again arise two air rollers 14 and 15 with opposite Sense of rotation, so that the upward air flows directed to the blower devices 7 and 8 18 and 22 of the two air rollers 14 and 15 between these lie.

The operation of this arrangement according to Figure 3 is the same as this in connection with FIGS. 1 and 2 is described.

Fig. 4 shows schematically the structure of the second Blower device 8. It has an all-round closed, rectangular sheet metal housing 31 with a Top 32, a bottom 33 and with a total four side walls 34 parallel to one another in pairs on. In the bottom 33 is next to the left Side wall 34 of the air inlet 13 in the form of a plurality notched longitudinal slots 35 through which the air can penetrate into the interior of the housing 31. An inner partition begins next to this air inlet 13 36, a chamber 37 inside the housing 31 departments. The partition 36 connects on the one hand to the Floor 33 next to the air inlet 13 and leads at a distance to the top 32 to the right side wall 34. The air outlet 12, for example in the form of a Grille cover, is also in the bottom 33 and connects the partitioned chamber 37 to the outside atmosphere. The arrangement is such that the air outlet 12 parallel to the right side wall 34 and runs adjacent to it.

The partition 36 consists of a on the bottom 33 beginning ascending part 38 which is at a distance from the Top 32 ends and in a horizontal section 39 passes, which leads to the right side wall 34 this is largely airtight. Furthermore these two sections 38 and 39 extend the partition 36 perpendicular to the plane of the drawing between the side walls 34 parallel to the plane of the drawing.

An intake funnel is located in the partition wall section 38 41, in which a fan 42 is arranged. At a distance to the blower 42 is a schematic in the chamber 37 indicated air conditioning device 43 is provided, which in the simplest case is a heat exchanger that the air flows through.

Next to the exhaust air end of the air conditioning device 43 that spanned the entire depth of the chamber 37, i.e. extends perpendicular to the plane of the drawing, a further partition 44 is arranged in the chamber 37, starting at the upper partition section 39 thence sloping down towards the right side wall 34 runs and above that in the Air outlet 12 seated grille 45 in a horizontal Section 46 passes over to its free end the right side wall 34 is attached. This will in the chamber 37 a further inner chamber 47 in terms of flow divided. This further chamber 47 serves as Air duct for generating an induction air jet using a high pressure blower 48 attached to an intake funnel 49 connected in the upper Partition section 39 is formed and into the inner Chamber 47 opens.

The air from the inner chamber 37 passes through a Ejector nozzle 51, which is designed as a spherical nozzle and thus adjustable in the lower partition section 46 sits.

The operation of the blower device is like follows:

With the aid of the blower 42, air is passed through the air inlet 13 sucked in and under pressure into the chamber 37 promoted. In the chamber 37 flows through the Blower 42 delivers air to the air conditioner 43 and impinges on the partition 44 on which it is deflected downward so that it passes through the grating 45 of the air outlet 12 can flow out. Another, air stream entering through the air inlet 13 flows past the blower 42 through the between the top 32 and the upper partition section 39 delimited Channel to the intake funnel 49. The high pressure fan 48, which is connected to the suction funnel 49 presses the air drawn in at relatively high pressure and thus a correspondingly high speed over the Ejector nozzle 51 to the outside, which is behind the grille 45 of the Air outlet 12 is arranged. The high speed of the induction jet emerging from the ejector 51 also serves as a support beam for stabilization of the air curtain and thus to that from the Air conditioning device 43 coming air with lower Air speed against the effect of the natural Convection to the floor 2 of the room 1 too create.

In the embodiment shown Blower device is thus only a part of the intake Air conditioned, while the other part without Conditioning blown out at high speed becomes. However, it is also possible to use a second air conditioning device to also provide the air that exits through the ejector nozzle 51 with respect to temperature and / or bring moisture to appropriate values.

Because of the type of representation is shown in the Blower device 8 only one ejector 51 visible. However, it is easy to understand that several according to the width of the blower device 8 such ejector nozzles 51 are arranged side by side can. The first blower device 7 can with Except for the air conditioning device 43 as well be constructed like the second blower device 8.

The training shown in Figs. 1 to 3 opposing air curtains can not only with the 4 achieve air curtain device according to FIG an additional induction air jet is used. Alternatively, it is also possible to use these air rollers 14 and 15 with air curtains to which the High pressure part and consequently the induction air jet are missing. It is sufficient to use only the primary air which is generated with the aid of the fan 42 and off exits the air outlet 12.

Claims (13)

1. Arrangement for producing an air curtain on a door or a doorway (5, 26) of a room (1),

   with a first fan arrangement (7) which is disposed above the door or the doorway (5, 26),

   has at least one air outlet (9) adjacent to the door or the doorway (5, 26),

   has at least one air inlet (11) positioned nearer to the interior of the room relative to the air outlet (9), and

   from the air outlet (9) of which an air stream (16) emerges which is directed downwards from above, is deflected upwards from the floor (2) to the fan arrangement (7) and at least part of it is drawn into the air inlet (11) in such a way that a first air roll (14) is produced of which the upwardly streaming part (18) is remote from the door or the doorway (5, 26),

   with a second fan arrangement (8) which has at least one air outlet (12) directed towards the floor (2) and at least one air inlet (13),

   and which lies further into the interior of the room relative to the first fan arrangement (7), and

   is oriented in such a way that its air inlet (13) is adjacent to the air inlet (11) of the first fan arrangement (7) in order to produce an air roll (15) which has a direction of rotation opposite to that of the first air roll (14), the rising air flow (18, 22) occurring between the air rolls (14, 15),

   characterised in that only the second fan arrangement (8) has an air conditioning arrangement (43) which is disposed between its air inlet (13) and its air outlet (12) in terms of the flow and with the aid of which the air flowing from the air inlet (13) to the air outlet (12) can be adjusted with regard to the temperature and/or humidity values.
2. Arrangement as claimed in Claim 1, characterised in that both fan arrangements (7, 8) are accommodated in their own housings (31) which are separate from one another.
3. Arrangement as claimed in Claim 1, characterised in that the first and the second fan arrangement (7, 8) are spaced from one another.
4. Arrangement as claimed in Claim 1, characterised in that both fan arrangements (7, 8) are accommodated in a common housing.
5. Arrangement as claimed in Claim 1, characterised in that the air inlet (11) of the first fan arrangement (7) and the air inlet (13) of the second fan arrangement (8) are combined into one common air inlet.
6. Arrangement as claimed in Claim 1, characterised in that a plurality of first and second fan arrangements (7, 8) are disposed adjacent to one another along the width of the door or the doorway (5, 26).
7. Arrangement as claimed in Claim 1, characterised in that the first and the second fan arrangement (7, 8) are optionally of identical construction up to an air conditioning arrangement (43).
8. Arrangement as claimed in Claim 1, characterised in that the first and/or the second fan arrangement (7, 8) comprises a secondary air fan (48) for producing an induction air jet as well as a primary air fan (42) which produces an air stream with a large volume and a slower speed than the secondary air fan (49).
9. Arrangement as claimed in Claim 8, characterised in that the secondary air fan (49) has at least one ejector nozzle (51) which belongs to the air outlet (9, 12).
10. Arrangement as claimed in Claim 1, characterised in that the first and/or the second fan arrangement (7, 8) contains its own fan, these fans being optionally adjustable independently of one another.
11. Arrangement as claimed in Claim 1, characterised in that the first and/or the second fan arrangement (7, 8) contains its own air guide arrangements which are substantially independent of one another.
12. Arrangement as claimed in Claim 1, characterised in that the first and the second fan arrangement (7, 8) are substantially independent of one another in aerodynamic terms.
13. Arrangement as claimed in Claim 1, characterised in that the air conditioning arrangement (43) is merely a heating arrangement.

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