EP3855085B1 - Vorrichtung zur erzeugung eines luftschleiers - Google Patents

Vorrichtung zur erzeugung eines luftschleiers Download PDF

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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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EP
European Patent Office
Prior art keywords
air
flow
cross
blow
outlet openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20153093.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3855085A1 (de
Inventor
Werner Reumüller
Gerhard Koblmüller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAUSER GmbH
Original Assignee
Hauser GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hauser GmbH filed Critical Hauser GmbH
Priority to PL20153093.8T priority Critical patent/PL3855085T3/pl
Priority to EP20153093.8A priority patent/EP3855085B1/de
Priority to HUE20153093A priority patent/HUE065154T2/hu
Publication of EP3855085A1 publication Critical patent/EP3855085A1/de
Application granted granted Critical
Publication of EP3855085B1 publication Critical patent/EP3855085B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
EP20153093.8A 2020-01-22 2020-01-22 Vorrichtung zur erzeugung eines luftschleiers Active EP3855085B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL20153093.8T PL3855085T3 (pl) 2020-01-22 2020-01-22 Urządzenie do generowania kurtyny powietrznej
EP20153093.8A EP3855085B1 (de) 2020-01-22 2020-01-22 Vorrichtung zur erzeugung eines luftschleiers
HUE20153093A HUE065154T2 (hu) 2020-01-22 2020-01-22 Készülék egy légfüggöny létrehozására

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20153093.8A EP3855085B1 (de) 2020-01-22 2020-01-22 Vorrichtung zur erzeugung eines luftschleiers

Publications (2)

Publication Number Publication Date
EP3855085A1 EP3855085A1 (de) 2021-07-28
EP3855085B1 true EP3855085B1 (de) 2023-11-08

Family

ID=69187640

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20153093.8A Active EP3855085B1 (de) 2020-01-22 2020-01-22 Vorrichtung zur erzeugung eines luftschleiers

Country Status (3)

Country Link
EP (1) EP3855085B1 (pl)
HU (1) HUE065154T2 (pl)
PL (1) PL3855085T3 (pl)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1462730B1 (de) * 2003-03-25 2015-09-09 Kampmann GmbH Vorrichtung zur Erzeugung eines Luftschleiers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
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 (de) * 2009-07-08 2011-01-13 Frico Ab Luftschleiervorrichtung
JP5881227B1 (ja) * 2015-08-07 2016-03-09 有限会社川野技研 エアカーテン装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1462730B1 (de) * 2003-03-25 2015-09-09 Kampmann GmbH Vorrichtung zur Erzeugung eines Luftschleiers

Also Published As

Publication number Publication date
PL3855085T3 (pl) 2024-05-13
HUE065154T2 (hu) 2024-05-28
EP3855085A1 (de) 2021-07-28

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