EP1158177B1 - Lüfter - Google Patents

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Publication number
EP1158177B1
EP1158177B1 EP01401157A EP01401157A EP1158177B1 EP 1158177 B1 EP1158177 B1 EP 1158177B1 EP 01401157 A EP01401157 A EP 01401157A EP 01401157 A EP01401157 A EP 01401157A EP 1158177 B1 EP1158177 B1 EP 1158177B1
Authority
EP
European Patent Office
Prior art keywords
funnels
tunnel
products
fan
disc
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.)
Expired - Lifetime
Application number
EP01401157A
Other languages
English (en)
French (fr)
Other versions
EP1158177A1 (de
Inventor
Robert Taylor
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude
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 Air Liquide SA, LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP1158177A1 publication Critical patent/EP1158177A1/de
Application granted granted Critical
Publication of EP1158177B1 publication Critical patent/EP1158177B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers

Definitions

  • the subject of the present invention is a fan intended in particular to equip a refrigeration tunnel with products such as food products, as well as the tunnel equipped with such a set of fans, as defined in the preambles of claims 1 and 3.
  • Such The fan is known, for example, from EP-A-408956.
  • cryogenic refrigeration tunnels for food products a cold gaseous stream is circulated which ensures convective heat transfer between the cold gas and the food product to be refrigerated.
  • the goal is to ensure high levels of heat transfer without damaging or moving the products on the conveyor belt, while minimizing the energy dissipated inside the cryogenic tunnel.
  • This type of tunnel has been used for over thirty years with a wide variety of fans and devices to ensure the necessary gas movement.
  • the most common fans act axially and are arranged to blow down towards the food product. Centrifugal fans are also used to push the gas transversely to the products.
  • the heat transfer coefficients of such systems are normally between 45 and 90 W / m 2 / ° C.
  • Tunnels optimized for mainly thin products such as small burgers use gaseous vortices with a heat transfer coefficient of about 120 W / m 2 / ° C or produce gaseous jets impacting products with a heat transfer coefficient greater than 200 W / m 2 / ° C.
  • Gaseous vortices typically require the gas to flow through uncovered areas of the conveyor belt, limiting their application to products that do not completely cover the conveyor belt, a 65% upper limit for the coverage of the conveyor belt. carpet being usual.
  • Gaseous impact systems are normally based on fans that create an overpressure in a relatively large volume of the tunnel.
  • Gas jet impacts are produced by a gas that is expelled from a high pressure volume through a plurality of holes, or channels.
  • these impact systems In order for these impact systems to be used in cryogenic tunnels, they must be easy to clean, and special features are required to maintain their performance due to the potential presence of snow and ice formed in the holes and tubes or canals.
  • the invention therefore aims to provide a fan arranged to overcome these disadvantages.
  • the fan targeted by the invention is intended in particular to equip a refrigeration tunnel of products such as food products, this tunnel being traversed by a cold gaseous refrigeration stream.
  • this fan comprises at least one pair of funnels fixed on one side of a support rotatably mounted about a vertical axis and associated with a rotating drive means, and these funnels have their openings.
  • inlet arranged radially to allow the gas stream to enter and exit at an accelerated speed through their outlet opening.
  • a set of these fans can be conveniently arranged inside the tunnel, the funnels of each fan can be profiled to generate a gaseous jet moving for example at a speed of 20 to 30m / s and which impacts the product to be refrigerated .
  • the high speed of the exhaust gas jet of the fans provides high levels of heat transfer because the boundary layer around the product is very thin.
  • the action of the fan does not create high suction flows or areas of very low pressure, which advantageously makes it possible to minimize any displacement of the products.
  • the cryogenic tunnel also referred to by the invention, is equipped with a set of these fans, arranged to direct locally cold gaseous streams at an accelerated rate over predetermined areas of the conveyor.
  • the single figure is a simplified perspective view of an embodiment of a fan according to the invention, intended to equip for example a cryogenic tunnel.
  • the fan shown in the attached figure is intended in particular to equip a refrigeration tunnel of products such as food products.
  • the support 2 may be constituted for example by a disc axially equipped with a pin 3 adapted to receive an output shaft of the drive motor.
  • the two funnels 1, 2 are fixed diametrically opposite on a lower face of the disc 2 disposed in a substantially horizontal plane.
  • Their inlet openings 4 may have any contour, for example rectangular as shown, and are preferably situated substantially in the same diametral plane of the disk 2.
  • the funnels 1 are bent downwards in the direction opposite to the direction of rotation R
  • the section of the body of each funnel gradually decreases along the curvature thereof to a small diameter outlet opening 5.
  • the cold gas stream rushes into the inlets 4 and flows inside the funnels 1 as indicated by the set of arrows F, to an accelerated speed.
  • the gas streams impact the products to be refrigerated, not shown, disposed below the disk 2 on the conveyor belt conveyor not shown.
  • a set of such fans can be arranged in specific areas of the tunnel, in which must be provided a high degree of convective heat transfer. These fans are therefore located where they are considered the most advantageous for the operation of the tunnel. For example they can be arranged at the entrance, where the surface of the products can be refrigerated by minimizing their dehydration and creating an abrupt temperature gradient inside the product. It can also be placed near a cryogenic injection point, where there is a very large difference in temperature between the gas and the product to be refrigerated.
  • the rotation speed of the fan can vary widely to optimize its performance depending on the products to be refrigerated.
  • Cryogenic injection into the path of these funnel fans can be used to control frost formation or to increase heat transfer from the injection zone.
  • the conformation of these funnel fans is optimized to produce efficient gas movement and allow easy cleaning. These fans reduce the risk of moving lightweight products while providing a high degree of convective heat transfer.
  • fans according to the invention When fans according to the invention are used in the liquid nitrogen injection zone (cryogenic injection zone), it is possible to vaporize a ring around the fan to spray towards the axis of the fan.
  • the funnel fan collects the aerosol and directs directly to the product a combination of cold gas and liquid nitrogen droplets entrained by it at high speed.
  • Liquid Nitrogen Aerosol provides an added benefit of cleaning any snow or frost formation before it can reduce the aerodynamic performance of the funnel fan. The latter has proved effective at low temperatures but can also be used at high temperatures, for example for continuous cooking systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Manufacturing And Processing Devices For Dough (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Claims (3)

  1. Lüfter, der insbesondere dazu dient, einen Kühltunnel von Produkten wie Nahrungsmittelprodukten auszurüsten, wobei dieser Tunnel von einem Gasdurchfluss durchflossen wird, dadurch gekennzeichnet, dass er mindestens ein Paar Trichter (1) umfasst, die auf einer Seite eines Trägers (2) befestigt sind, der drehbar um eine vertikale Achse (XX) montiert ist und der einem Drehantriebsmittel zugeordnet ist, und dadurch gekennzeichnet, dass die Trichter ihre Eingangsöffnungen (4) radial angeordnet haben, um es dem Gasdurchfluss zu erlauben, dort einzudringen und dort auszutreten mit einer beschleunigten Geschwindigkeit durch ihre Ausgangsöffnung (5).
  2. Lüfter nach Anspruch 1, dadurch gekennzeichnet, dass der Träger eine Scheibe (2) ist, auf deren einer Seite die Trichter (1) befestigt sind und dies diametral entgegengesetzt zu ihren Eingangsöffnungen (4), die sich fast in einer selben Diametralebene befinden, und dass die Trichter nach unten und in der Gegenrichtung zur Drehrichtung (R) der Scheibe gebogen sind.
  3. Kryogener Kühltunnel von Produkten, beispielsweise von Nahrungsmittelprodukten, die auf einem Fördermittel ablaufen und in dem ein kalter Gasdurchfluss zirkulieren kann, dadurch gekennzeichnet, dass er mit einer Einheit von Lüftern ausgerüstet ist, die einem der Ansprüche 1 und 2 entsprechen und die angeordnet sind, um kalte Gasdurchflüsse mit einer beschleunigten Geschwindigkeit auf vorbestimmten Zonen des Fördermittels lokal zu leiten.
EP01401157A 2000-05-23 2001-05-04 Lüfter Expired - Lifetime EP1158177B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0006558A FR2809481B1 (fr) 2000-05-23 2000-05-23 Ventilateur destine notamment a equiper un tunnel de refrigeration de produits tels que des produits alimentaires et tunnel equipe d'un ensemble de ces ventilateurs
FR0006558 2000-05-23

Publications (2)

Publication Number Publication Date
EP1158177A1 EP1158177A1 (de) 2001-11-28
EP1158177B1 true EP1158177B1 (de) 2006-03-29

Family

ID=8850504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01401157A Expired - Lifetime EP1158177B1 (de) 2000-05-23 2001-05-04 Lüfter

Country Status (8)

Country Link
US (1) US6446457B1 (de)
EP (1) EP1158177B1 (de)
AT (1) ATE321948T1 (de)
AU (1) AU780894B2 (de)
CA (1) CA2348123A1 (de)
DE (1) DE60118318T2 (de)
ES (1) ES2261361T3 (de)
FR (1) FR2809481B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20021394A1 (it) * 2002-06-25 2003-12-29 Sol Spa Apparecchiatura di surgelazione particolarmente per prodotti alimentari atta a limitare l'inflitrazione di aria umida nella camera di surgel
US7231781B2 (en) * 2004-06-07 2007-06-19 Jessey Roger JR Ice Cool Fan
BE1018767A5 (nl) 2009-06-02 2011-08-02 Devriese Peter Diagonale ventilator.
CN103452902B (zh) * 2013-08-21 2015-12-30 谢坤 压缩空气收集装置
CN104359205B (zh) * 2014-10-29 2017-04-12 珠海格力电器股份有限公司 转动风道机构及空调器

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB212123A (en) * 1923-03-14 1924-03-06 American Blower Co Improvements in centrifugal fans
US1699201A (en) * 1928-11-27 1929-01-15 Edwin F Guth Fan
FR667554A (fr) * 1929-01-17 1929-10-18 Perfectionnements aux ventilateurs
US2765748A (en) * 1952-04-24 1956-10-09 Buchi Alfred Centrifugal blowers or pumps
US3260443A (en) * 1964-01-13 1966-07-12 R W Kimbell Blower
DE3923779A1 (de) * 1989-07-18 1991-01-31 Linde Ag Fluegelrad
US5123261A (en) * 1990-08-20 1992-06-23 Valley Grain Products, Inc. Cooling tunnel for food products
US5168711A (en) * 1991-06-07 1992-12-08 Air Products And Chemicals, Inc. Convective heat transfer system for a cryogenic freezer
US5551251A (en) * 1995-02-08 1996-09-03 York Food Systems Impingement freezer
US5478584A (en) * 1995-02-15 1995-12-26 Tyson Holding Company Freezing system
CA2216101C (en) * 1995-03-28 2010-04-13 The Boc Group, Inc. Apparatus and method for freezing food products
US5520013A (en) * 1995-06-05 1996-05-28 Industrial Technology Research Institute Food freezing conveyor system
US5765381A (en) * 1997-03-04 1998-06-16 Air Liquide America Corporation Multitier crossflow cryogenic freezer and method of use
US6298682B1 (en) * 1998-09-16 2001-10-09 Carrier Corporation Condensate deflector for an air conditioner

Also Published As

Publication number Publication date
DE60118318D1 (de) 2006-05-18
FR2809481A1 (fr) 2001-11-30
FR2809481B1 (fr) 2002-08-16
US20020124589A1 (en) 2002-09-12
EP1158177A1 (de) 2001-11-28
CA2348123A1 (fr) 2001-11-23
US6446457B1 (en) 2002-09-10
AU780894B2 (en) 2005-04-21
AU4612001A (en) 2001-11-29
DE60118318T2 (de) 2006-11-30
ES2261361T3 (es) 2006-11-16
ATE321948T1 (de) 2006-04-15

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