EP3855085B1 - Device for generating an air curtain - Google Patents
Device for generating an air curtain Download PDFInfo
- Publication number
- EP3855085B1 EP3855085B1 EP20153093.8A EP20153093A EP3855085B1 EP 3855085 B1 EP3855085 B1 EP 3855085B1 EP 20153093 A EP20153093 A EP 20153093A EP 3855085 B1 EP3855085 B1 EP 3855085B1
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- European Patent Office
- Prior art keywords
- air
- flow
- cross
- blow
- outlet openings
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- 230000007423 decrease Effects 0.000 claims description 5
- 239000003570 air Substances 0.000 description 98
- 238000001816 cooling Methods 0.000 description 10
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F9/00—Use of air currents for screening, e.g. air curtains
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/081—Air-flow control members, e.g. louvres, grilles, flaps or guide plates for guiding air around a curve
Definitions
- Air curtain with an air duct and several flow chambers, each adjoining the air duct, having inlet and outlet openings, the outlet openings of which adjoin one another transversely to a common blow-out direction.
- the DE2402340B2 discloses a refrigerated display case for cooling goods, which includes a device for generating an air curtain with four air streams that differ from one another in temperature.
- the innermost cooled air flow i.e. the one facing the interior, has two functions.
- the DE2402340B2 also suggests adding a fourth air stream at ambient temperature to prevent mixing of the ambient air with the air curtain.
- the disadvantage of the prior art is that the air streams must have different temperatures in order to fulfill their respective functions. In order to apply different temperatures to the air streams, it is necessary for design reasons that each air stream passes through a different cooling circuit. This increases the construction and Space required by the device and therefore the costs.
- the different temperatures of the air flows must also be precisely coordinated in order to reduce, for example, icing of the goods as well as turbulence and heat input from the outside area.
- the temperature differences between the air flows and the outside area inevitably lead to turbulence at the boundary layers, which leads to heat input, reduces the stability of the air curtain and thus increases the energy requirement.
- the invention is therefore based on the object of achieving an energy-efficient air curtain that is stable over a large section and with the simplest possible construction conditions.
- the invention solves the problem in that the cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers decreases from a main flow chamber.
- the flow chambers act either as nozzles or as diffusers, these cross-sectional ratios being directly proportional to the speeds of the respective air flows as they leave the outlet openings, with other properties, such as the temperature of the air flows, being involved Cooling of the interior area can be essentially identical.
- the differences in speed of adjacent air flows are reduced by the decreasing cross-sectional ratios between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers.
- the main flow chamber generates the fastest air flow due to the largest cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings, which creates the actual shielding of the interior from the exterior.
- the speed of the air flows also decreases between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers.
- the number of flow chambers and the dimensioning of the cross-sectional ratios can reduce the decrease in speed of adjacent air flows, thereby minimizing turbulence and heat input from the outside area.
- the energy consumption of the device can be reduced by setting the cross-sectional ratio of the flow chambers between 0.05 and 1.5.
- too high performance and speeds mean that the air curtain is susceptible to turbulence and therefore becomes energetically inefficient.
- Tests have shown that in cooling technology, a cross-sectional ratio of the flow chambers between 0.05 and 1.5 leads to an optimized condition with regard to the energy consumption of the device and the stability of the air curtain created.
- the air curtain is additionally stabilized against external interference if the cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings of a first flow chamber is between 1 and 1.4, a second flow chamber is between 0.11 and 0.15 and a third flow chamber is between 0. 05 and 0.1.
- external interventions i.e. the entry of a physical object, such as a hand, into the air curtain, can endanger the stability of the air curtain and trigger turbulence.
- the speed, homogeneity and stability of the air curtain can be increased if at least three flow chambers are provided. Tests have shown that at least three flow chambers are necessary in order to implement sufficiently small speed differences between the air streams in order to avoid turbulence at sufficiently high speeds of the air streams. If additional flow chambers are provided, the speed difference can be continually reduced for given frame speeds.
- the fastest air flow from the main flow chamber is the one closest to the interior, with the cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers decreasing towards the exterior.
- the air curtain protects against turbulence and heat input from outside. Because the fastest air flow is directly adjacent to the stationary air layer of the interior area, turbulence occurs between these two layers, but this does not lead to any heat exchange if the temperature of the fastest air flow essentially corresponds to the temperature of the interior area.
- a flow chamber is formed by the air duct itself.
- the remaining flow chambers can be provided as internals in the flow channel, while one flow chamber is located from the remaining one to the others Flow chambers connected in parallel results in free volume of the air duct. It only needs to have its own outlet opening for the air duct, which adjoins the other outlet openings transversely to the common blow-out direction. By dimensioning this outlet opening in coordination with the flow chambers, the desired cross-sectional ratios can still be achieved, which not only saves material but also space.
- a common blow-out honeycomb stabilizes and directs the outflowing air flows under uniform conditions, making optimized blow-out easier.
- material costs are reduced and cleaning is made easier because only one component has to be replaced.
- blow-in direction for each flow chamber runs transversely to the blow-out direction. Since the speed of the air flows only depends on the cross-sectional ratio of the inlet to the outlet openings, the relative orientation of the inlet and outlet openings can be freely selected. This means that structural conditions can be better addressed and limited space can be better utilized.
- the device can be installed more efficiently in a refrigerated cabinet if the air duct in the area in front of the flow chambers runs transversely to the blow-out direction.
- the air in the cooling curtain can be circulated in a refrigerated shelf.
- the air curtain is sucked in again opposite the exhaust openings, for example with the help of a fan.
- the air flow In order to feed this air flow back into the air duct, the air flow must be redirected. If the air duct in the area in front of the flow chambers runs transversely to the blow-out direction, this deflection can be implemented easily from a structural engineering perspective, since the Air flow is only diverted in the flow chambers and before that can be fed to a common treatment, such as cooling.
- a device comprises an air duct 1, in which the inlet opening 2 flows into the flow chamber 3 and the inlet opening 4 flows into the flow chamber 5. Within the flow chambers 3, 5, the air is deflected and exits via the outlet openings 6, 7 of the flow chambers 3, 5 as several air streams A, B, C forming an air curtain.
- the air duct 1 itself forms a flow chamber 8 with the inlet opening 9 and the outlet opening 10.
- the outlet openings 6, 7, 10 adjoin one another transversely to a common blow-out direction 11.
- the cross-sectional ratio between the cross-sectional areas of the inlet openings 2, 4, 9 and the outlet openings 6, 7, 10 of adjacent flow chambers 3, 5, 10 decreases from a main flow chamber, which in the illustrated embodiment is formed by the flow chamber 8 of the air duct 1.
- the air flow A formed in the flow chamber 8 is at least as fast as the air in the air duct 1, since the cross-sectional ratio of the inlet opening 9 to the outlet opening 10 is between 1 and 1.4.
- the air flow B is due to of the cross-sectional ratio of the inlet opening 4 to the outlet opening 6, which is between 0.11 and 0.15, slower than the air flow A.
- the air flow C is due to the cross-sectional ratio of the inlet opening 2 to the outlet opening 7, which is between 0.05 and 0.1 is, the slowest of the three air flows A, B and C.
- the outlet openings 6, 7, 10 are followed by a common blow-out honeycomb 12, which stabilizes the outflowing air flows.
- the air duct 1 also runs transversely to the blow-out direction 11, which facilitates the dimensioning and applicability of the device for a refrigerated shelf, as in particular in the Fig. 2 will be shown.
- the air streams A, B and C forming the air curtain are sucked in opposite the device, for example by means of a fan 13.
- the fan 13 serves, on the one hand, to suck in the air from the air flows A, B and C, and on the other hand to maintain air circulation in the refrigerated shelf, so that the air can be fed back into the device.
- the air from the air streams A, B and C passes a heat exchanger 14, which is located upstream of the device. Because the air flows A, B and C are fed back to the cooling circuit via the fan 13, energy for cooling the air and thus costs can be saved.
Description
Luftschleiers mit einem Luftkanal und mehreren, je an den Luftkanal anschließenden, Einlass- und Auslassöffnungen aufweisenden Strömungskammern, deren Auslassöffnungen quer zu einer gemeinsamen Ausblasrichtung aneinander angrenzen.Air curtain with an air duct and several flow chambers, each adjoining the air duct, having inlet and outlet openings, the outlet openings of which adjoin one another transversely to a common blow-out direction.
Aus dem Stand der Technik sind Vorrichtungen zur Erzeugung von Luftschleiern bekannt, bei denen sich die Luftschleier aus mehreren, im Wesentlichen parallel zueinander verlaufenden Luftströmen zusammensetzen. Der Zweck eines solchen Luftschleiers ist, einen Innenbereich, in dem beispielsweise zu kühlende Waren gelagert sind, vor Wärmeeintrag aus einem Außenbereich zu schützen. Die
Dokument
Nachteilig am Stand der Technik ist jedoch, dass die Luftströme unterschiedliche Temperaturen aufweisen müssen, um ihre jeweiligen Funktionen zu erfüllen. Um die Luftströme mit unterschiedlichen Temperaturen zu beaufschlagen ist es konstruktionsbedingt notwendig, dass jeder Luftstrom einen anderen Kühlkreislauf durchläuft. Dies erhöht den Konstruktions - und Platzaufwand der Vorrichtung und demzufolge die Kosten. Die verschiedenen Temperaturen der Luftströme müssen darüber hinaus genau abgestimmt werden, um beispielswiese eine Vereisung der Ware sowie Verwirbelungen und Wärmeeinträge aus dem Außenbereich zu verringern. Die Temperaturdifferenzen der Luftströme zueinander und zum Außenbereich führen aber zwangsläufig zu Verwirbelungen an den Grenzschichten, was zu einem Wärmeeintrag führt, die Stabilität des Luftschleiers vermindert und somit den Energiebedarf erhöht.However, the disadvantage of the prior art is that the air streams must have different temperatures in order to fulfill their respective functions. In order to apply different temperatures to the air streams, it is necessary for design reasons that each air stream passes through a different cooling circuit. This increases the construction and Space required by the device and therefore the costs. The different temperatures of the air flows must also be precisely coordinated in order to reduce, for example, icing of the goods as well as turbulence and heat input from the outside area. However, the temperature differences between the air flows and the outside area inevitably lead to turbulence at the boundary layers, which leads to heat input, reduces the stability of the air curtain and thus increases the energy requirement.
Der Erfindung liegt somit die Aufgabe zugrunde, einen energieeffizienten, über einen größeren Abschnitt stabilen Luftschleier mit möglichst einfachen Konstruktionsbedingungen zu erreichen.The invention is therefore based on the object of achieving an energy-efficient air curtain that is stable over a large section and with the simplest possible construction conditions.
Die Erfindung löst die gestellte Aufgabe dadurch, dass das Querschnittsverhältnis zwischen den Querschnittsflächen der Einlass- und der Auslassöffnungen aneinander angrenzender Strömungskammern von einer Hauptströmungskammer aus abnimmt. Je nach Querschnittsverhältnis zwischen den Querschnittsflächen der Einlass- und der Auslassöffnungen wirken die Strömungskammern entweder als Düsen oder als Diffusoren, wobei diese Querschnittsverhältnisse direkt proportional zu den Geschwindigkeiten der jeweiligen Luftströme beim Verlassen der Ausblassöffnungen sind, wobei andere Eigenschaften, wie beispielsweise die Temperatur der Luftströme zur Kühlung des Innenbereiches, im Wesentlichen ident sein können. Da insbesondere durch großen Geschwindigkeitsunterschied angrenzender Luftströme hervorgerufene Verwirbelungen für einen Wärmeeintrag aus dem Außenbereich verantwortlich sind, werden die Geschwindigkeitsunterschiede benachbarter Luftströme durch die abnehmenden Querschnittsverhältnisse zwischen den Querschnittsflächen der Einlass- und der Auslassöffnungen aneinander angrenzender Strömungskammern gesenkt. Die Hauptströmungskammer erzeugt durch das größte Querschnittsverhältnis zwischen den Querschnittsflächen der Einlass- und der Auslassöffnungen den schnellsten Luftstrom, der die eigentliche Abschirmung des Innenbereiches vom Außenbereich erzeugt. Durch die Abnahme der Querschnittsverhältnisse zwischen den Querschnittsflächen der Einlass- und der Auslassöffnungen aneinander angrenzender Strömungskammern nimmt also auch die Geschwindigkeit der Luftströme ab. Durch die Anzahl der Strömungskammern und die Dimensionierung der Querschnittsverhältnisse kann also die Geschwindigkeitsabnahme benachbarter Luftströme verringert und dadurch Verwirbelungen und der Wärmeeintrag vom Außenbereich minimiert werden.The invention solves the problem in that the cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers decreases from a main flow chamber. Depending on the cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings, the flow chambers act either as nozzles or as diffusers, these cross-sectional ratios being directly proportional to the speeds of the respective air flows as they leave the outlet openings, with other properties, such as the temperature of the air flows, being involved Cooling of the interior area can be essentially identical. Since turbulences caused by large differences in speed of adjacent air flows are responsible for heat input from the outside, the differences in speed of adjacent air flows are reduced by the decreasing cross-sectional ratios between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers. The main flow chamber generates the fastest air flow due to the largest cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings, which creates the actual shielding of the interior from the exterior. By decreasing the cross-sectional ratios The speed of the air flows also decreases between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers. The number of flow chambers and the dimensioning of the cross-sectional ratios can reduce the decrease in speed of adjacent air flows, thereby minimizing turbulence and heat input from the outside area.
Der Energieverbrauch der Vorrichtung kann gesenkt werden, indem das Querschnittsverhältnis der Strömungskammern zwischen 0,05 und 1,5 liegt. Bei der Dimensionierung der Bauteile eines Luftschleiers gilt es, die Leistung der beteiligten Komponenten so zu wählen, dass durch die Geschwindigkeit des Luftschleiers eine kontinuierliche Luftzirkulation und Wärmeabschirmung ermöglicht wird. Andererseits führen aber zu hohe Leistungen und Geschwindigkeiten dazu, dass der Luftschleier anfällig für Turbulenzen und damit energetisch ineffizient wird. Versuche haben gezeigt, dass in der Kühltechnik ein Querschnittsverhältnis der Strömungskammern zwischen 0,05 und 1,5 zu einem optimierten Zustand im Hinblick auf den Energieverbrauch der Vorrichtung und der Stabilität des erzeugten Luftschleiers führt.The energy consumption of the device can be reduced by setting the cross-sectional ratio of the flow chambers between 0.05 and 1.5. When dimensioning the components of an air curtain, it is important to select the performance of the components involved so that the speed of the air curtain enables continuous air circulation and heat shielding. On the other hand, too high performance and speeds mean that the air curtain is susceptible to turbulence and therefore becomes energetically inefficient. Tests have shown that in cooling technology, a cross-sectional ratio of the flow chambers between 0.05 and 1.5 leads to an optimized condition with regard to the energy consumption of the device and the stability of the air curtain created.
Der Luftschleier wird gegen Eingriffe von außen zusätzlich stabilisiert, wenn das Querschnittsverhältnis zwischen den Querschnittsflächen der Einlass- und der Auslassöffnungen einer ersten Strömungskammer zwischen 1 und 1,4, einer zweiten Strömungskammer zwischen 0,11 und 0,15 und einer dritten Strömungskammer zwischen 0,05 und 0,1 liegt. Insbesondere Eingriffe von außen, also das Eintreten eines physischen Objektes, wie beispielsweise einer Hand, in den Luftschleier können die Stabilität des Luftschleiers gefährden und Turbulenzen auslösen. Bei diesen Parametern herrschen jedoch durch die resultierenden Geschwindigkeiten der Luftströme zusätzlich zum beschriebenen verringerten Energiebedarf, verbesserte Übergangsbedingungen zwischen den Luftströmen untereinander, sowie dem Außenbereich vor, sodass in diesem Wertebereich die Unempfindlichkeit des langsameren Luftstromes der dritten Strömungskammer gegenüber äußerer Eingriffe mit dem Wärmeschutzeffekt des schnellen Luftstromes der ersten Strömungskammer zusammenwirkt. Der Luftstrom der zweiten Strömungskammer, dessen Geschwindigkeit zwischen der des ersten und dritten Luftstromes liegt, dient hierbei als Puffer um Verwirbelungen, hervorgerufen durch zu hohe Geschwindigkeitsdifferenzen an der Grenzschicht, zwischen dem ersten und dritten Luftstrom zu verhindern. Dadurch stützen sich die drei Luftströme gegenseitig gegen Verwirbelungen und Wärmeeintrag.The air curtain is additionally stabilized against external interference if the cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings of a first flow chamber is between 1 and 1.4, a second flow chamber is between 0.11 and 0.15 and a third flow chamber is between 0. 05 and 0.1. In particular, external interventions, i.e. the entry of a physical object, such as a hand, into the air curtain, can endanger the stability of the air curtain and trigger turbulence. With these parameters, however, due to the resulting speeds of the air flows, in addition to the reduced energy requirement described, there are improved transition conditions between the air flows among themselves and the outside area, so that in this value range the insensitivity of the slower air flow of the third flow chamber to external interventions with the thermal protection effect of the fast air flow the first Flow chamber interacts. The air flow of the second flow chamber, whose speed is between that of the first and third air flow, serves as a buffer to prevent turbulence between the first and third air flow caused by excessive speed differences at the boundary layer. This means that the three air streams support each other against turbulence and heat input.
Die Geschwindigkeit, Homogenität und Stabilität des Luftschleiers kann erhöht werden, wenn wenigstens drei Strömungskammern vorgesehen sind. Versuche haben gezeigt, dass wenigstens drei Strömungskammern notwendig sind, um die ausreichend geringe Geschwindigkeitsdifferenzen zwischen den Luftströmen umzusetzen um bei ausreichend hohen Geschwindigkeiten der Luftströme Verwirbelungen zu vermeiden. Sind zusätzliche Strömungskammern vorgesehen, lässt sich die Geschwindigkeitsdifferenz bei gegebenen Rahmengeschwindigkeiten immer weiter verringern. In einer besonders bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung, ist der schnellste Luftstrom aus der Hauptströmungskammer der dem Innenbereich am nächsten gelegene, wobei das Querschnittsverhältnis zwischen den Querschnittsflächen der Einlass- und der Auslassöffnungen aneinander angrenzender Strömungskammern in Richtung Außenbereich abnimmt. So schützt der Luftschleier vor Verwirbelungen und Wärmeeintrag vom Außenbereich. Dadurch, dass der schnellste Luftstrom direkt an die ruhende Luftschicht des Innenbereiches angrenzt, kommt es zwar zwischen diesen beiden Schichten zu Verwirbelungen, diese führen aber zu keinem Wärmeaustausch, wenn die Temperatur des schnellsten Luftstromes im Wesentlichen der Temperatur des Innenbereichs entspricht.The speed, homogeneity and stability of the air curtain can be increased if at least three flow chambers are provided. Tests have shown that at least three flow chambers are necessary in order to implement sufficiently small speed differences between the air streams in order to avoid turbulence at sufficiently high speeds of the air streams. If additional flow chambers are provided, the speed difference can be continually reduced for given frame speeds. In a particularly preferred embodiment of the device according to the invention, the fastest air flow from the main flow chamber is the one closest to the interior, with the cross-sectional ratio between the cross-sectional areas of the inlet and outlet openings of adjacent flow chambers decreasing towards the exterior. The air curtain protects against turbulence and heat input from outside. Because the fastest air flow is directly adjacent to the stationary air layer of the interior area, turbulence occurs between these two layers, but this does not lead to any heat exchange if the temperature of the fastest air flow essentially corresponds to the temperature of the interior area.
Um die Vorrichtung besonders materialschonend und kompakt auszugestalten, wird vorgeschlagen, dass eine Strömungskammer durch den Luftkanal selbst gebildet ist. Zufolge dieser Maßnahme können die übrigen Strömungskammern als Einbauten in den Strömungskanal vorgesehen werden, während sich eine Strömungskammer aus dem verbleibenden, zu den übrigen Strömungskammern parallelgeschalteten freien Volumen des Luftkanales ergibt. Es muss lediglich für den Luftkanal eine eigene Auslassöffnung aufweisen, die quer zur gemeinsamen Ausblasrichtung an die übrigen Auslassöffnungen angrenzt. Durch die Dimensionierung dieser Auslassöffnung in Abstimmung mit den Strömungskammern können weiterhin die gewünschten Querschnittsverhältnisse realisiert werden, wodurch nicht nur Material, sondern auch Platz eingespart werden kann.In order to make the device particularly gentle on materials and compact, it is proposed that a flow chamber is formed by the air duct itself. As a result of this measure, the remaining flow chambers can be provided as internals in the flow channel, while one flow chamber is located from the remaining one to the others Flow chambers connected in parallel results in free volume of the air duct. It only needs to have its own outlet opening for the air duct, which adjoins the other outlet openings transversely to the common blow-out direction. By dimensioning this outlet opening in coordination with the flow chambers, the desired cross-sectional ratios can still be achieved, which not only saves material but also space.
Besonders praktische Betriebs- und Instandhaltungsbedingungen ergeben sich, wenn den Auslassöffnungen in Strömungsrichtung eine gemeinsame Ausblaswabe nachgelagert ist. Eine gemeinsame Ausblaswabe stabilisiert und lenkt die ausströmenden Luftströme unter uniformen Bedingungen, sodass ein optimiertes Ausblasen erleichtert wird. Außerdem sinken die Materialkosten und die Reinigung wird erleichtert, da nur ein Bauteil ausgetauscht werden muss.Particularly practical operating and maintenance conditions arise when a common blow-out honeycomb is downstream of the outlet openings in the direction of flow. A common blow-out honeycomb stabilizes and directs the outflowing air flows under uniform conditions, making optimized blow-out easier. In addition, material costs are reduced and cleaning is made easier because only one component has to be replaced.
Um den Platzbedarf der Vorrichtung zu verringern, wird vorgeschlagen, dass je Strömungskammer die Einblasrichtung quer zur Ausblasrichtung verläuft. Da die Geschwindigkeit der Luftströme nur vom Querschnittsverhältnis der Einlass- zu den Auslassöffnungen abhängt, kann die relative Ausrichtung der Einlass- zu den Auslassöffnungen frei gewählt werden. Dadurch kann auf bauliche Rahmenbedingen besser eingegangen, beziehungsweise ein begrenztes Raumangebot besser ausgenutzt werden.In order to reduce the space required by the device, it is proposed that the blow-in direction for each flow chamber runs transversely to the blow-out direction. Since the speed of the air flows only depends on the cross-sectional ratio of the inlet to the outlet openings, the relative orientation of the inlet and outlet openings can be freely selected. This means that structural conditions can be better addressed and limited space can be better utilized.
Die Vorrichtung kann effizienter in einem Kühlmöbel verbaut werden, wenn der Luftkanal im Bereich vor den Strömungskammern quer zur Ausblasrichtung verläuft. Um die Energie- und Kühleffizienz zu erhöhen, kann in einem Kühlregal die Luft des Kühlschleiers einem Kreislauf zugeführt werden. Hierbei wird gegenüber den Ausblassöffnungen, beispielsweise mit Hilfe eines Ventilators, der Luftschleier wieder angesaugt. Um diesen Luftstrom wieder dem Luftkanal zuzuführen, muss der Luftstrom umgelenkt werden. Verläuft der Luftkanal im Bereich vor den Strömungskammern quer zur Ausblasrichtung, kann diese Umlenkung bautechnisch einfach umgesetzt werden, da der Luftstrom erst in den Strömungskammern umgelenkt wird und davor einer gemeinsamen Behandlung, wie beispielsweise einer Kühlung, zugeführt werden kann. Zusätzlich dazu ist die Berechnung und Dimensionierung der Querschnittsflächen und deren Verhältnisse einfacher zu bewerkstelligen, da die notwendige Umlenkung der Luft erst nach der Einleitung in die Strömungskammern stattfindet, wo sie die Austrittsgeschwindigkeit und - richtung des Luftstromes nicht beeinflusst. Dadurch werden die strömungsmechanischen Überlegungen zur Versorgung der Strömungskammern mit Luft vereinfacht.The device can be installed more efficiently in a refrigerated cabinet if the air duct in the area in front of the flow chambers runs transversely to the blow-out direction. In order to increase energy and cooling efficiency, the air in the cooling curtain can be circulated in a refrigerated shelf. Here, the air curtain is sucked in again opposite the exhaust openings, for example with the help of a fan. In order to feed this air flow back into the air duct, the air flow must be redirected. If the air duct in the area in front of the flow chambers runs transversely to the blow-out direction, this deflection can be implemented easily from a structural engineering perspective, since the Air flow is only diverted in the flow chambers and before that can be fed to a common treatment, such as cooling. In addition, the calculation and dimensioning of the cross-sectional areas and their ratios is easier to accomplish, since the necessary deflection of the air only takes place after it has been introduced into the flow chambers, where it does not influence the exit speed and direction of the air flow. This simplifies the fluid mechanics considerations for supplying the flow chambers with air.
In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt. Es zeigen
- Fig.1
- einem Schnitt durch eine erfindungsgemäße Vorrichtung parallel zur Ausblasrichtung und
- Fig. 2
- eine schematische Darstellung der Vorrichtung in einem Kühlkreislauf.
- Fig.1
- a section through a device according to the invention parallel to the blow-out direction and
- Fig. 2
- a schematic representation of the device in a cooling circuit.
Eine Vorrichtung umfasst einen Luftkanal 1, bei der die Einlassöffnung 2 die Strömungskammer 3, und die Einlassöffnung 4 die Strömungskammer 5 anströmt. Innerhalb der Strömungskammern 3, 5 wird die Luft umgelenkt und tritt über die Auslassöffnungen 6, 7 der Strömungskammern 3, 5 als mehrere, einen Luftschleier bildende, Luftströme A, B, C aus. In der gezeigten, besonders bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung bildet der Luftkanal 1 selbst eine Strömungskammer 8 mit der Einlassöffnung 9 und der Auslassöffnung 10. Die Auslassöffnungen 6, 7, 10 grenzen dabei quer zu einer gemeinsamen Ausblasrichtung 11 aneinander an. Das Querschnittsverhältnis zwischen den Querschnittsflächen der Einlassöffnungen 2, 4, 9 und der Auslassöffnungen 6, 7, 10 aneinander angrenzender Strömungskammern 3, 5, 10 nimmt von einer Hauptströmungskammer, die in der dargestellten Ausführungsform von der Strömungskammer 8 des Luftkanals 1 gebildet wird, ab. Wie insbesondere aus
Claims (7)
- Device for producing an air curtain with an air duct (1) and a plurality of flow chambers (3, 5, 8) each having inlet openings (2, 4, 9) and outlet openings (6, 7, 10) adjoining the air duct (1), the outlet openings (6, 7, 10) of the flow chambers (3, 5, 8) adjoin one another transversely to a common blow-out direction (11), characterized in that the cross-sectional ratio between the cross-sectional areas of the inlet openings (2, 4, 9) and outlet openings (6, 7, 10) of mutually adjacent flow chambers (3, 5, 8) decreases from a main flow chamber, and in that the cross-sectional ratio between the cross-sectional areas of the inlet openings (2, 4, 9) and outlet openings (6, 7, 10) of the flow chambers (3, 5, 8) is between 0.05 and 1.5.
- Device according to claim 1, characterized in that the cross-sectional ratio between the cross-sectional areas of the inlet openings (2, 4, 9) and outlet (6, 7, 10) openings of a first flow chamber (8) is between 1 and 1.4, of a second flow chamber (5) is between 0.11 and 0.15, and of a third flow chamber (3) is between 0.05 and 0.1.
- Device according to claim 1 or 2, characterized in that at least three flow chambers (3, 5, 8) are provided.
- Device according to any one of claims 1 to 3, characterized in that a flow chamber (8) is formed by the air duct (1) itself.
- Device according to any one of claims 1 to 4, characterized in that a common discharge honeycomb (13) is arranged downstream of the outlet openings (6, 7, 10) in the blow-out direction (11).
- Device according to one any one of claims 1 to 5, characterized in that for each flow chamber (3, 5, 8) the blow-in direction is transverse to the blow-out direction.
- Refrigerating cabinet with a device according to any one of claims 1 to 6, characterized in that the air duct (1) runs transversely to the blow-out direction (11) in the region in front of the flow chambers (3, 5, 8).
Priority Applications (1)
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EP20153093.8A EP3855085B1 (en) | 2020-01-22 | 2020-01-22 | Device for generating an air curtain |
Applications Claiming Priority (1)
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EP20153093.8A EP3855085B1 (en) | 2020-01-22 | 2020-01-22 | Device for generating an air curtain |
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EP3855085A1 EP3855085A1 (en) | 2021-07-28 |
EP3855085B1 true EP3855085B1 (en) | 2023-11-08 |
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EP20153093.8A Active EP3855085B1 (en) | 2020-01-22 | 2020-01-22 | Device for generating an air curtain |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1462730B1 (en) * | 2003-03-25 | 2015-09-09 | Kampmann GmbH | Device for creating an air curtain |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3756038A (en) * | 1972-04-07 | 1973-09-04 | Emhart Corp | Refrigerated display equipment |
US3935803A (en) * | 1972-10-12 | 1976-02-03 | Flanders Filters, Inc. | Air filtration apparatus |
ZA74348B (en) | 1973-05-04 | 1974-11-27 | Emhart Corp | Refrigerated display case |
DE102009032232A1 (en) * | 2009-07-08 | 2011-01-13 | Frico Ab | Air curtain device |
JP5881227B1 (en) * | 2015-08-07 | 2016-03-09 | 有限会社川野技研 | Air curtain device |
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2020
- 2020-01-22 EP EP20153093.8A patent/EP3855085B1/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1462730B1 (en) * | 2003-03-25 | 2015-09-09 | Kampmann GmbH | Device for creating an air curtain |
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