EP1657494B1 - Exhaust hood - Google Patents

Exhaust hood Download PDF

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Publication number
EP1657494B1
EP1657494B1 EP05005889.0A EP05005889A EP1657494B1 EP 1657494 B1 EP1657494 B1 EP 1657494B1 EP 05005889 A EP05005889 A EP 05005889A EP 1657494 B1 EP1657494 B1 EP 1657494B1
Authority
EP
European Patent Office
Prior art keywords
air stream
air
exhaust hood
wall jet
stream guide
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 - Fee Related
Application number
EP05005889.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1657494A1 (en
Inventor
Seung Jo Baek
Sung Bae Song
Sang Bum Sohn
Je Jun Lee
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP1657494A1 publication Critical patent/EP1657494A1/en
Application granted granted Critical
Publication of EP1657494B1 publication Critical patent/EP1657494B1/en
Expired - Fee Related 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
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2064—Removing cooking fumes illumination for cooking hood
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • 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

Definitions

  • the present invention relates to an exhaust hood, and more particularly, to an exhaust hood including an air stream guide for effectively connecting an air stream formed by the wall jet generated in front of the exhaust hood without separation of the air stream so as to enhance collection efficiency of polluted air generated from the food preparation area in the kitchen.
  • heating devices such as electric heaters, gas ranges, and the like for cooking food by supplying heat so as to heat or roast food are placed.
  • odors due to the high temperatures caused by the heating device in food preparation area, these odors may take the form of oil particles or other various aerosols which are dispersed in the air within the kitchen and thus stimulate the sense of smell of persons present thereabouts. These odors are generally considered to be unpleasant to the senses and, additionally, decrease ones concentration and have negative health effects.
  • Fig. 1 is a schematic view illustrating a conventional kitchen exhaust hood.
  • the conventional kitchen exhaust hood as shown in Fig. 1 , is spaced apart from the food preparation area 7 for cooking food so as to form a cooking space, and has a side fixed on a mounting wall 8 and a top fixed to the ceiling 9.
  • the conventional exhaust hood includes body 2 forming the outward appearance of the conventional exhaust hood, a motor (not shown) for generating driving power for sucking air into the body 2 and exhausting the air to the exterior, an exhaust fan 6 electrically connected to the motor and sucking the air, a filter 4, disposed at the bottom of the body 2, through which the air passes while being sucked into the body 2, and a pipe (not shown) serving as a passage through which the air passed through the filter 4 and sucked into the body 2 is exhausted to the exterior.
  • the conventional exhaust hood is operated as follows.
  • Polluted air containing gas, grease droplets, and the like generated during cooking ascend because of their own buoyancy due to temperature higher than the ambient air or compulsorily ascend by the exhaust fan 6, and the ascended polluted air passes through the filter 4 and is exhausted to the exterior through the external duct.
  • the conventional exhaust hood for exhausting the polluted air using the exhaust fan sucks air, near to an inlet disposed at the bottom of the body of the exhaust hood, but suction power of the conventional exhaust hood with respect to air far from the inlet is weakened in proportion to the inverse square of the distance, and even if the exhaust fan has large suction power, the collecting efficiency of the conventional exhaust hood is not directly proportional to the suction power when distance between the food preparation area where the polluted air is generated and the inlet is long.
  • the amount of the polluted air which is not collected by the conventional exhaust hood is increased when the exhaust fan 6 generates an air stream with slower than a polluted air stream with desired flow rate, and the flow rate of the polluted air substantially sucked through the inlet is reduced by the resistance of the filter 4. Even when the exhaust fan 6 generates the desired flow rate to suck the polluted air, the polluted air cannot be effectively collected into the conventional exhaust hood and pollutes the kitchen.
  • an exhaust hood comprises a suction fan, which sucks polluted air through a surface filter, which is then guided to an exhaust conduit.
  • a fan suctions air through the surface filter in the center of the hood from the vapor area and blows the air through a blast channel to a front side of the hood.
  • the wall jet generated at the front side of the hood by the air injected by the blast channel is guided along a curved surface on the basis of a coanda effect.
  • a second wall jet stabilizes the jet diversion so that the adherence of the jet at the bottom side of the hood is improved.
  • the hood is shown with a blow out channel, suction slots, a curved blast jet guide, a surface filter, and a twin blast channel.
  • DE 199 11 850 A1 describes a method and a device for limiting, detecting and sucking off harmful substances, especially in extractor hoods.
  • an exhaust hood generates an air stream guided between an inner wall and an outer wall to a plurality of injection holes within a perforated strip.
  • the perforated strip is connected to a coanda pipe having a curved surface.
  • the wall jet is guided along the lower side of the bottom of the hood.
  • a fumes extractor hood having an air curtain.
  • a fumes extractor hood comprises a housing equipped with a suction opening and a discharge opening, and in which a fan is installed.
  • An air blast is located outside the suction opening and it extends across the whole width of the housing.
  • EP 0 555 676 A1 describes an exhaust hood and a method for sucking off dust and mist.
  • an exhaust hood comprises a suction blower, a filter arrangement, air guides and a horizontal wall-blowing jet, which is directed from the front lower hood edge towards the sucking-off surface or the filter and sucks in the mist flow and takes it to the sucking-in surface.
  • An additional blower is provided for generating the wall-blowing jet, wherein a helical flow is generated on the underside of the hood in the region of the blow-out nozzle by means of a double slit injection nozzle.
  • the present invention has been made in view of the above and/or other problems, and it is an object of the present invention to provide an exhaust hood for effectively collecting the polluted air generated from the food preparation area in the kitchen using a small amount of exhaust air so as to prevent the polluted air from spreading throughout the kitchen and other rooms.
  • an exhaust hood including a body including an exhaust fan disposed at the upper side of a food preparation area and exhausting indoor air, and a filter disposed at an inlet through which the indoor air is sucked and filtering the sucked indoor air, a wall jet generator for generating wall jet flowing along the curved surface at the front side of the body by injecting air, and an air stream guide disposed a predetermined distance from the curved surface and guiding the air stream generated by the wall jet flowing to the filter inlet.
  • the air stream guide is disposed at the position where the air stream is generated by the wall jet.
  • the curved surface formed at the front side of the body is the outer circumference of a hollow cylindrical rod.
  • the air stream guide is constructed such that the position where the air stream guide starts is the position where an angle from the position where the wall jet is generated on the hollow cylindrical rod is 80 degrees to 100 degrees in the direction that the air stream is formed, and the position where the air stream guide ends is where an angle from the position where the air stream guide starts is 20 degrees to 40 degrees.
  • the wall jet generator is constructed such that the position where the wall jet is generated on the hollow cylindrical rod is 80 degrees to 100 degrees from a plane parallel to the filter inlet.
  • the hollow cylindrical rod further includes an illuminating device.
  • the wall jet generator maintains the velocity of the air stream guided by the air stream guide within the range of 3 m/s to 5 m/s.
  • the air stream guide is constructed such that an upper gap between the air stream guide and the curved surface where the generated wall jet is introduced is wider than a lower gap between the air stream guide and the curved surface where the wall jet passes.
  • the air stream guide is constructed such that the upper gap between the air stream guide and the curved surface is about 8 mm, and the lower gap between the air stream guide and the curved surface is about 6 mm.
  • the wall jet generator injects the outside air of the body, or injects the air introduced into the body.
  • the body further includes a slit formed at the lower side of the body, through which the wall jet, after passing through the air stream guide, is directly introduced into the body.
  • the exhaust hood according to the present invention is capable of exhausting the polluted air near to the inlet of the body of the exhaust hood using the conventional exhaust fan effectively. Since the exhaust hood according to the present invention further includes the wall jet generator and the air stream guide for preventing the separation of the wall jet generated by the wall jet generator in order to collect the polluted air spaced apart from the inlet of the body and ineffectively collected by the conventional exhaust hood, the polluted air can be effectively collected without increasing the capacity of the exhaust fan.
  • Fig. 2 is a sectional view illustrating the exhaust hood according to the first embodiment of the present invention.
  • the exhaust hood includes a body 12 having a curved front side and an inlet 12a formed at the bottom, a motor (not shown) for generating driving power for sucking air into the body 12 and exhausting the air to the exterior, an exhaust fan 16 electrically connected to the motor and sucking the air into the inlet 12a, a filter 14, disposed at the inlet 12a of the body 12, through which the air passes while being sucked into the body 12, and a pipe (not shown) serving as a passage through which the air, after passing through the filter 14 and being sucked into the body 12, is exhausted to the exterior, a wall jet generator 20 provided in the body 12 and injecting air to generate wall jet at a curved front of the body 12, and an air stream guide 30 provided where the wall jet generated by the wall jet generator 20 is separated and guiding an air stream toward the inlet 12a.
  • a motor not shown
  • an exhaust fan 16 electrically connected to the motor and sucking the air into the inlet 12a
  • a filter 14 disposed at the inlet 12a of
  • the wall jet generator 20 includes a wall jet fan motor 24 for flowing air flow by force so as to generate the wall jet, a discharge pipe 26 serving as a passageway through which the air flows toward the front side of the body 12 by the wall jet fan motor 24, a hollow cylindrical rod 28 horizontally disposed to the front lower corner of the body 12, and an injection nozzle 22 provided at the end of the discharge pipe 26 and injecting air flow generated by the wall jet fan motor 24 so as to generate the wall jet.
  • the lower side of the body 12 has a circular surface formed by the outer circumference of the hollow cylindrical rod 28, and the hollow cylindrical rod 28 is further provided with an illuminating device 29 therein.
  • the hollow cylindrical rod 28 is preferably made of transparent synthetic resin so that light emitted from the illuminating device 29 passes through the hollow cylindrical rod 28 and illuminates the kitchen.
  • the injection nozzle 22 injects air so as to generate the wall jet from the upper outer side of the hollow cylindrical rod 28.
  • the injection nozzle 22 is preferably provided to generate the wall jet at a place ⁇ 1 on the outer circumference of the hollow cylindrical rod 28, where an angle from a plane parallel to the inlet 12a is 80 degrees to 100 degrees.
  • the air stream guide 30 includes a connecting device 31 provided at the sides of the air stream guide 30 and connecting the air stream guide 30 to the hollow cylindrical rod 28 such that an upper gap between the air stream guide 30 and the hollow cylindrical rod 28, through which the wall jet is introduced, is wider than a lower gap therebetween through which the wall jet passes.
  • the widest upper gap between the air stream guide 30 and the hollow cylindrical rod 28 is about 8 mm
  • the narrowest lower gap between the air stream guide 30 and the hollow cylindrical rod 28 is about 6 mm
  • the size of the gaps gradually decreases closer to the lower side of the hollow cylindrical rod 28.
  • the air stream guide 30 is provided at a position ⁇ 2 where the air stream generated by the wall jet is separated.
  • the air stream guide 30 is preferably extended from the position where an angle, from the position ⁇ 1 where the wall jet is generated on the outer circumference of the hollow cylindrical rod 28 to the position on the hollow cylindrical rod 28 in the direction that the air stream flows, is 80 degrees to 100 degrees.
  • the air stream guide 30 preferably has a length from a position ⁇ 2 where the air stream generated by the wall jet is separated to a position ⁇ 3, wherein an angle from the position ⁇ 2 to the position ⁇ 3 is 20 degrees to 40 degrees.
  • the exhaust hood constructed as described above is operated as follows.
  • the exhaust hood operates the exhaust fan 16 to suck the indoor polluted air into the body 12 and the wall jet generator 20 during cooking.
  • the wall jet fan motor 24 When the wall jet fan motor 24 is activated to suck the air at the upper side of the body 12, the sucked air passes through the discharge pipe 26 and is jetted on the upper side of the hollow cylindrical rod 28 by the injection nozzle 22.
  • the wall jet is generated and the air stream is formed along the outer circumference of the hollow cylindrical rod 28, and a negative pressure is generated at a region A where the wall jet and the air stream are generated.
  • the Coanda effect is phenomenon that a fluid tends to adhere to and flow along a convex surface, and this phenomenon is caused by viscosity of fluid.
  • the wall jet produced by the injection nozzle 22 is generated at the upper outer circumference of the hollow cylindrical rod 28, that is, at the place ⁇ 1 on the outer circumference of the hollow cylindrical rod 28, where an angle from a plane parallel to the inlet 12a is 80 degrees to 100 degrees as seen from the left side of the hollow cylindrical rod 28, flows along the outer circumference of the hollow cylindrical rod 28, and is separated at the position ⁇ 2 where an angle, from the position ⁇ 1 where the wall jet is generated on the outer circumference of the hollow cylindrical rod 28 in the direction that the air stream is formed, is 80 degrees to 100 degrees.
  • the wall jet Since the air stream guide 30 is provided at the position ⁇ 2 where the air stream formed by the wall jet is separated, the wall jet is not separated, but is introduced into the upper gap between the air stream guide 30 and the hollow cylindrical rod 28, and then another negative pressure occurs at the lower region B while the wall jet passes through the lower gap.
  • the wall jet generator 20 preferably injects the air such that the velocity of the air passing through the gap between the air stream guide 30 and the hollow cylindrical rod 28 can be maintained in the range of 3 m/s to 5 m/s.
  • the air stream guide 30 Since the air stream guide 30 has a length equal to the length from the position ⁇ 2 where the air stream formed by the wall jet is separated to the position where the angle is 20 degrees to 40 degrees, the air stream, after passing through the air stream guide 30, is guided to the inlet 12a of the body 12.
  • the polluted air generated when cooking and escaped to a place far from the inlet 12a of the body 12, is led to the region B of the lower side of the hollow cylindrical rod 28 where the negative pressure is generated by the air stream guide 30, and the polluted air not collected into the region B of the lower side of the body 12 ascends due to its own buoyancy and is led to the region A of the upper side of the hollow cylindrical rod 28 where the air stream is generated by the wall jet generated by the wall jet generator 20, so that the air streams of the polluted air is guided into the inlet 12a of the body.
  • the air streams led to the regions A and B are guided into a collecting area near to the inlet 12a of the exhaust hood toward the filter 14, and are sucked into the body 12 of the exhaust hood after passing through the filter, so that the collection efficiency is increased.
  • Fig. 3 is a view illustrating comparison of streamlines formed around the front side of the exhaust hood according to the first embodiment of the present invention with streamlines formed around the front side of the exhaust hood without the air stream guide.
  • the air stream formed by the separation of the wall jet at the position ⁇ 2 where the air stream generated by the wall jet is separated is spaced apart from the lower side of the body 12, so that the separated wall jet does not substantially flow to the inlet 12a.
  • the air stream guide 30 provided at the position ⁇ 2 where the air stream formed by the wall jet is separated, guides the separated wall jet to flow along the outer circumference of the hollow cylindrical rod 28 again, so that the pollute air effectively heads the inlet 12a.
  • Fig. 4 is a sectional view illustrating the exhaust hood according to the second embodiment of the present invention.
  • the exhaust hood according to the second embodiment of the present invention is constructed such that a wall jet fan motor 24' sucks air in the body instead of air in front of the body 12 so as to generate the wall jet using recirculation of the air sucked into the body 12. Since the components, except for the wall jet fan motor 24', and the operation of the exhaust hood according to the second embodiment of the present invention are identical to those of the exhaust hood according to the first embodiment of the present invention, identical reference numerals are assigned to like components and their description will be omitted.
  • Fig. 5 is a sectional view illustrating the exhaust hood according to the third embodiment of the present invention.
  • the exhaust hood according to the third embodiment of the present invention is constructed such that the wall jet fan motor 24' recirculates the air in the body 13 so as to generate the wall jet. Moreover, the exhaust hood according to the third embodiment of the present invention is constructed such that a slit 15 is formed at a region where the lower side 13a of the body 13 meets the hollow cylindrical rod 28, so that a part of the wall jet generated by the wall jet generator is directly sucked into the body 13.
  • the exhaust hood according to the present invention is described as being installed to the front corner of the outer lower side of the body 12, the wall jet generator and the air steam guide can be provided to the right and left lower corners, respectively.
  • the exhaust hood according to the present invention is capable of exhausting the polluted air near to the inlet of the body of the exhaust hood using the conventional exhaust fan effectively. Since the exhaust hood according to the present invention further includes the wall jet generator and the air stream guide for preventing the separation of the wall jet generated by the wall jet generator in order to collect the polluted air spaced apart from the inlet of the body and ineffectively collected by the conventional exhaust hood, the polluted air can be effectively collected without enhancing the performance of the exhaust fan.
  • the polluted air escaped from the front side of the body is collected through negative pressure surfaces respectively formed at the upper and lower sides of the hollow cylindrical rod, the polluted air flowing to a cooker's face is minimized so as to provide clean indoor air.
  • the exhaust hood can be further provided to the conventional exhaust hood, and the collection efficiency of the polluted air can be enhanced by a small amount of the exhausted air.
  • the illuminating device is installed in the hollow cylindrical rod provided to the wall jet generator so as to provide an aesthetically pleasing appearance and to improve work efficiency.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
EP05005889.0A 2004-11-10 2005-03-17 Exhaust hood Expired - Fee Related EP1657494B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020040091432A KR100644837B1 (ko) 2004-11-10 2004-11-10 배기후드

Publications (2)

Publication Number Publication Date
EP1657494A1 EP1657494A1 (en) 2006-05-17
EP1657494B1 true EP1657494B1 (en) 2014-03-05

Family

ID=35784747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05005889.0A Expired - Fee Related EP1657494B1 (en) 2004-11-10 2005-03-17 Exhaust hood

Country Status (4)

Country Link
EP (1) EP1657494B1 (zh)
KR (1) KR100644837B1 (zh)
CN (1) CN1773174B (zh)
AU (1) AU2005201104B2 (zh)

Families Citing this family (15)

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KR100664069B1 (ko) * 2005-08-22 2007-01-04 엘지전자 주식회사 월젯모듈 및 이를 구비한 배기 후드
KR100677289B1 (ko) * 2005-08-22 2007-02-02 엘지전자 주식회사 배기 후드
KR100664067B1 (ko) * 2005-08-22 2007-01-03 엘지전자 주식회사 배기 후드
KR100664068B1 (ko) * 2005-08-22 2007-01-03 엘지전자 주식회사 배기 후드
KR100677288B1 (ko) * 2005-08-22 2007-02-02 엘지전자 주식회사 배기 후드
KR100741786B1 (ko) * 2005-08-23 2007-07-24 엘지전자 주식회사 배기 후드
KR100826022B1 (ko) * 2006-11-22 2008-04-28 엘지전자 주식회사 후드 및 후드의 순환장치
DE102007039635A1 (de) * 2007-03-20 2008-09-25 BSH Bosch und Siemens Hausgeräte GmbH Dunstabzugshaube
DE102007039633A1 (de) * 2007-08-22 2009-02-26 BSH Bosch und Siemens Hausgeräte GmbH Gehäuse einer Dunstabzugshaube mit einem Luftaustrittsspalt
DE102007039634A1 (de) * 2007-08-22 2009-02-26 BSH Bosch und Siemens Hausgeräte GmbH Gehäuse einer Dunstabzugshaube
KR101486268B1 (ko) * 2013-01-01 2015-01-28 진남기 각종 국소배기 후드 흡인장치
CN108571757B (zh) * 2017-03-08 2021-06-08 博西华电器（江苏）有限公司 吸油烟机的摄像装置及吸油烟机
CN106949513A (zh) * 2017-04-11 2017-07-14 广东美的智美科技有限公司 用于形成射流的喷嘴装置及排烟装置
KR20220156316A (ko) * 2021-05-18 2022-11-25 삼성전자주식회사 레인지 후드 및 이를 포함하는 조리 기기
JP7430673B2 (ja) 2021-08-23 2024-02-13 理研ビタミン株式会社 わかめ種糸、わかめ種糸の製造方法及びわかめ種糸を用いたわかめの養殖方法

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KR100384700B1 (ko) * 2001-06-04 2003-05-23 주식회사 엑타 주방용 배기 후드
CN1752591A (zh) * 2004-09-24 2006-03-29 乐金电子(天津)电器有限公司 厨房用抽油烟机

Also Published As

Publication number Publication date
AU2005201104A1 (en) 2006-05-25
CN1773174A (zh) 2006-05-17
KR100644837B1 (ko) 2006-11-10
EP1657494A1 (en) 2006-05-17
KR20060042687A (ko) 2006-05-15
CN1773174B (zh) 2010-10-06
AU2005201104B2 (en) 2007-03-22

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