EP1757871A2 - Hotte d'évacuation - Google Patents

Hotte d'évacuation Download PDF

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Publication number
EP1757871A2
EP1757871A2 EP06001224A EP06001224A EP1757871A2 EP 1757871 A2 EP1757871 A2 EP 1757871A2 EP 06001224 A EP06001224 A EP 06001224A EP 06001224 A EP06001224 A EP 06001224A EP 1757871 A2 EP1757871 A2 EP 1757871A2
Authority
EP
European Patent Office
Prior art keywords
air
flow path
air supply
nozzle
curved shape
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.)
Withdrawn
Application number
EP06001224A
Other languages
German (de)
English (en)
Other versions
EP1757871A3 (fr
Inventor
Seung-Jo Baek
Sang-Bum Sohn
Sung-Bae Song
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 EP1757871A2 publication Critical patent/EP1757871A2/fr
Publication of EP1757871A3 publication Critical patent/EP1757871A3/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • 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

Definitions

  • the present invention relates to an exhaust hood, and more particularly, to an exhaust hood of which contaminated air collecting efficiency is enhanced.
  • an exhaust hood is disposed above a cooker such as a gas range or a laboratory table that generate materials causing air pollution like smoke, smells and grease vapor.
  • FIG 1 is a side sectional view that illustrates one example of an exhaust hood according to the conventional art.
  • the conventional exhaust hood includes a canopy 21 installed above a cooker 10 having a plurality of burners 11 a and 11 b spaced at a predetermined distance therebetween, and an exhaust part 31 communicating with the canopy 21 and upwardly protruding from the canopy 21 to a predetermined height.
  • An inlet 23 is formed at the bottom of the canopy 21, through which the polluted air including pollutants like smoke, smells and grease vapor generated from the cooker 10 is drawn in. Also, a grease filter 24 that can collect pollutants is mounted at the inlet 23.
  • An exhaust path 33 is formed in the exhaust part 31, through which the polluted air having been introduced through the inlet 23 is exhausted to the outside.
  • An exhaust fan 34 for forcibly taking in the air is installed under the exhaust path 33.
  • the polluted air including smoke, smells and grease vapor generated as burners 11 a and 11 b of the cooker heat food items is in a buoyancy jet form and increases in width as it ascends.
  • a method of increasing a rotation rate of the exhaust fan 34 and thusly increasing an intake force may be used.
  • the rotation rate of the exhaust fan 34 is increased to increase the intake force, the intake performance is not improved in proportion to the increased rotation force. For this reason, only the intake force of the exhaust fan 34 used in such a method is not enough to guide the polluted air, which is moved to outside along the bottom surface of the canopy 21, to the inlet 23.
  • the conventional exhaust hood cannot prevent the polluted air from moving out from the canopy 21, polluting an upper region (A) of the front side of the canopy 21 and spreading to a room to thus pollute a surrounding environment.
  • FIG 2 is a side sectional view that illustrates another example of a conventional exhaust hood.
  • the conventional exhaust hood in accordance with another example includes a hood body 51 disposed above a cooker 10 at a predetermined distance therebetween, and a nozzle part 81 installed at a front region of the hood body 51 and downwardly discharging the air.
  • the hood body 51 includes a canopy 61 installed above the cooker 10, which has a plurality of burners 11a and 11b, at a predetermined distance therebetween, and an exhaust part 71 communicating with the canopy 61 and upwardly protruding from the canopy 61 to a predetermined height.
  • the nozzle part 81 is formed at a front region of a bottom surface of the canopy 61 and discharges the air downwardly.
  • An air supply fan 83 for blowing the air to the nozzle part 81 is installed in the canopy 61.
  • a curve shape portion 85 having an arc shaped section which is convex downwardly is formed at a lower side of the front surface of the canopy 61, so that a portion of the air discharged through the nozzle part 81 can flow to a region of the inlet 63 by the so-called coanda effect.
  • the curved shape portion 85 the polluted air cannot be moved outside the canopy 61 but is guided to the inlet 63.
  • the nozzle part 81 is formed at a spot inwardly spaced apart from the front end of the canopy 61 at a predetermined distance.
  • the polluted air having ascended inside the canopy 61 can be guided to the inlet 63 by the air discharged through the nozzle part 81.
  • the method does not solve the problem that the polluted air ascending to the front end of the canopy 61 is moved out from the front end of the canopy 61 and pollutes an upper region (B).
  • an object of the present invention is to provide an exhaust hood of which contaminated air collecting efficiency is enhanced.
  • an exhaust hood comprising: a hood body 110 having a canopy 111 including an inlet 117, and an exhaust part 121 connected with the canopy 111 and having an exhaust flow path 123 therein; and a nozzle unit 140 installed at a front side of the hood body 110, and having a curved shape portion 141, a first nozzle 143 discharging air from top along a circumferential direction of the curved shape portion 141, and a second nozzle 145 discharging air from bottom along the circumferential direction of the curved shape portion 141 therein.
  • Figure 3 is a perspective view of an exhausted hood in accordance with a first embodiment of the present invention
  • Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3
  • Figure 5 is an enlarged view of a C portion of Figure 4.
  • an exhaust hood in accordance with the first embodiment of the present invention includes a hood body 110 and a nozzle unit 140 that is installed to a front side of the hood body 110.
  • the arrow indicates the air flow.
  • the hood body 110 includes a canopy 111 installed above a cooker 10 (refer to Figure 1) having a plurality of burners 11 a and 11 b thereon and separated therefrom at a certain distance, and an exhaust part 121 connected with the canopy 111 and protruding above the canopy 111 at a certain height.
  • the canopy 111 has a rectangular platy shape, and includes an inlet 117 taking in air and a grease filter 118 installed at the inlet 117 so as to collect pollutants at its lower surface at a lower surface of the canopy 111.
  • the canopy 111 has an air supply fan 135 sending air to the nozzle unit 140 and an air supply motor 136 operating the air supply fan 135 therein.
  • An intake flow path 133 is formed at the right of the air supply motor 136 and allows part of air introduced through the inlet 117 and the grease filter 118 to flow into the air supply fan 135.
  • An exhaust flow path 123 is formed at an upper side of the exhaust part 121 so as to exhaust air passing through the grease filter 118 so that pollutants are removed therefrom to the outside.
  • An exhaust fan 124 forcibly taking in air and an exhaust motor 125 operating the exhaust fan 124 are installed at a lower part of the exhaust flow path 123.
  • the nozzle unit 140 includes a curved shape portion 141, a first nozzle 143 discharging air from top along a circumferential surface of the curved shape portion 141, and a second nozzle 145 discharging air from bottom along the circumferential surface of the curved shape portion 141.
  • the curved shape portion 141 is a circular pole or a circular pipe and has a circular cross section whose diameter (D) is 40 to 65 mm.
  • the curved shape portion 141 is disposed at a front side of the canopy 111 such that a ratio (h/D) of a distance (h) between the center of the curved shape portion 141 and the lower surface of the canopy 111 with respect to the diameter (D) of the curved shape portion 141 is 0 to 0.25.
  • the first nozzle 143 is disposed at the upper side along a radial direction of the curved shape portion 141 so as to put a gap as many as 1.5 to 4 mm from the curved shape portion 141.
  • an interior angle ( ⁇ 1) formed by an imaginary line (L1) connecting the end of the first nozzle 143 with the center (O) of the curved shape portion 141 and a vertical line (Lv) passing through the center (O) of the curved shape portion 141 is 0 to 40 degrees in order to maximize the Coanda effect.
  • the first nozzle 143 is connected with a fist air supply flow path 137. Because of the first air supply flow path 137, air having been sent by the air supply fan 135 is discharged through the first nozzle 143.
  • velocity of air discharged through the first nozzle 143 is 3 to 5 m/sec in order to maximize the Coanda effect.
  • the second nozzle 145 is disposed at the lower side along the radial direction of the curved shape portion 141 so as to put a gap (d2) as many as 1.5 to 4 mm from the curved shape portion 141.
  • a gap (d2) as many as 1.5 to 4 mm from the curved shape portion 141.
  • an interior angle ( ⁇ 2) formed by an imaginary line (L2) connecting the end of the second nozzle 145 with the center (O) of the curved shape portion (141) and a vertical line (Lv) passing through the center (O) of the curved shape portion 141 is 90 to 135 degrees in order to maximize the Coanda effect.
  • the second nozzle 143 is connected to the second air supply flow path 138. Because of the second air supply flow path 138, air having been sent by the air supply fan 135 is discharged through the second nozzle 145.
  • velocity of air being discharged through the second nozzle 145 is 3 to 5 m/sec in order to maximize the Coanda effect.
  • a first air supply flow path 137 and a second air supply flow path 138 are disposed at the upper and lower sides of the curved shape portion 141, respectively, such that a central direction (L3) of a mixed air current formed by air discharged through the first nozzle 143 and flowing counterclockwise along a circumferential surface of an outer side of the curved shape portion 141 by the Coanda effect and air discharged through the second nozzle 145 and flowing clockwise along the circumferential surface of the outer side of the curved shape portion 141 exists between an angle ( ⁇ 3) of 160 to 200 degrees on the basis of the vertical line (Lv).
  • the air supply fan 135 rotates, part of the air from which the pollutants are removed is introduced into the intake flow path 133.
  • the introduced air is moved along the first air supply flow path 137 and the second air supply flow path 138 and then is discharged through the first nozzle 143 and the second nozzle 145, respectively.
  • the air discharged from the first nozzle 143 flows along the upper surface of the curved shape portion 141 and forms a negative pressure area of minus(-) gauge pressure at upper and front surfaces of the curved shape portion 141. Because of the formed negative pressure area (S1), contaminated air which is likely to flow out of the exhaust hood is curved toward the negative pressure area (S1) and is introduced into the inlet 117 again.
  • the mixed air current generated by adding air from the first nozzle 143 and the second nozzle 145 to each other generates an extended zone (S2) that forms the angle ( ⁇ 3) of approximately 200 degrees with respect to the vertical line (Lv), into which the contaminated air being discharged toward the lower side of the curved shape portion 141 and being likely to flow toward an outer circumferential surface of the exhaust hood is drawn. Since the extended zone (S2) brings about great indraft of fluid thereto, the contaminated air can be blocked and collected more effectively than air curtain. Because of the formed extended zone (S2), the contaminated air which is likely to flow out of the outer circumferential surface of the exhaust hood is curved toward the extended zone (S2) and is introduced into the inlet 117 again. In addition, since hot contaminated air toward the face of a cook is blocked, a pleasant cooking environment can be created.
  • Figure 6 is a perspective view in accordance with a second embodiment of the present invention
  • Figure 7 is a cross sectional view taken along line VII-VII of Figure 6.
  • air introduced through an inlet 117 is not supplied to a first nozzle 143 and a second nozzle 145 but air introduced through an upper inlet 153 formed on an upper surface of a canopy 111 and a grease filter 155 installed at the upper inlet 153 is supplied as air to be discharged through the first nozzle 143 and the second nozzle 145 in the second embodiment.
  • FIG 8 is a cross-sectional view of an exhaust hood in accordance with a third embodiment of the present invention.
  • air introduced through an inlet 117 is not supplied to a first nozzle 143 and a second nozzle 145, but part of air leaving through an exhaust flow path 123 is supplied as air to be discharged through the first nozzle 143 and the second nozzle 145 in the third embodiment.
  • a reflux flow path 161 is formed inside a canopy 111 and an exhaust part 121, in which one end of the reflux flow path 161 is connected to the exhaust flow path 123 and the other end is connected to a first air supply flow path 137 and a second air supply flow path 138.
  • an air supply fan 135 (refer to Figure 4) and an air supply motor 136 (refer to Figure 4) are not necessary anymore to cut down costs for them.
  • Figure 9 is a perspective view of an exhaust hood in accordance with a fourth embodiment of the present invention
  • Figure 10 is a plan view of Figure 9
  • Figure 11 is a sectional view taken along line XI-XI
  • Figure 12 is a sectional view taken along line XII-XII of Figure 10.
  • the fourth embodiment includes a nozzle unit 140 keeping contaminated air from moving toward the front of a canopy 111 and an auxiliary nozzle unit 170 preventing contaminated air from moving toward the side of the canopy 111.
  • an air supply fan 135 is installed at a central portion of the canopy 111 so as to supply air through the nozzle unit 140 and the auxiliary nozzle unit 170.
  • An intake flow path 133 is formed under the air supply fan 135 in order to lead air introduced through an inlet 117 and a grease filter 118 to the air supply fan 135.
  • a front air supply flow path 181 is formed at a front side of the air supply fan 135 so as to supply air to the nozzle unit 140.
  • the front air supply flow path 181 is connected to a first air supply flow path 137 and a second air supply path 138 in order to supply air to the first nozzle 143 and the second nozzle 145 along a direction in which air flows.
  • a plurality of lighting lamps 191 are installed inside a curved shape portion 141 and a lateral curved shape portion 171 for internal lighting and appearance.
  • a lateral air supply flow path 183 through which air is introduced to supply air to the auxiliary nozzle unit 170 is formed at right and left sides of the air supply fan 135.
  • the auxiliary nozzle unit 170 includes a lateral curved shape portion 171, a first lateral nozzle 173 discharging air from top along a circumferential direction of the lateral curved shape portion 171, and a second lateral nozzle 175 discharging air from bottom along the circumferential direction of the lateral curved shape portion 171.
  • the lateral air supply flow path 183 is connected to the first lateral air supply flow path 177 and the second lateral air supply flow path 178 so as to supply air to the first lateral nozzle 173 and the second lateral nozzle 175, respectively, along a direction in which air flows.
  • the first lateral nozzle 173, the second lateral nozzle 175, the first lateral air supply flow path 177, and the second lateral air supply flow path 178 are the same as the above-described the curved shape portion 141, the first nozzle 143, the second nozzle 145, the first air supply flow path 137, and the second air supply flow path 138 of the nozzle unit 140, descriptions for them will be omitted.
  • the air having been moved along the front air supply flow path 181 is moved along the first air supply flow path 137 and the second air supply flow path 138, and then is discharged through the first nozzle 143 and the second nozzle 145, respectively. Meanwhile, the air having been moved along the lateral air supply flow path 183 is moved along the first lateral air supply flow path 177 and the second lateral air supply flow path 178, and then is discharged through the first lateral nozzle 173 and the second lateral nozzle 175.
  • the auxiliary nozzle unit 170 can prevent contaminated air that moves toward the side as well as the front of the canopy 111 from being separated and spread.
  • air introduced through the upper inlet 153 can be supplied to the nozzle unit 140 and the auxiliary nozzle unit 170 by forming the upper inlet 153 on the upper surface of the canopy 111 as illustrated in the second embodiment.
  • air moving through the exhaust flow path 123 can be supplied to the nozzle unit 140 and the auxiliary nozzle unit 170 by forming the reflux flow path 161 (refer to Figure 8) inside the canopy 111 and the exhaust hood 121 as illustrated in the third embodiment.

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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)
EP06001224A 2005-08-22 2006-01-20 Hotte d'évacuation Withdrawn EP1757871A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020050077010A KR100664068B1 (ko) 2005-08-22 2005-08-22 배기 후드

Publications (2)

Publication Number Publication Date
EP1757871A2 true EP1757871A2 (fr) 2007-02-28
EP1757871A3 EP1757871A3 (fr) 2008-12-03

Family

ID=37433900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06001224A Withdrawn EP1757871A3 (fr) 2005-08-22 2006-01-20 Hotte d'évacuation

Country Status (2)

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EP (1) EP1757871A3 (fr)
KR (1) KR100664068B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1757865A2 (fr) * 2005-08-23 2007-02-28 LG Electronics Inc. Hotte d'aspiration
CN101646904B (zh) * 2007-03-20 2011-09-07 Bsh博施及西门子家用器具有限公司 抽油烟机
WO2017012630A1 (fr) * 2015-07-23 2017-01-26 Diehl Ako Stiftung & Co. Kg Hotte aspirante et procédé pour faire fonctionner une hotte aspirante

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6336451B1 (en) 1996-04-04 2002-01-08 Roehl-Hager Hannelore Process and device for confining, retaining and sucking off fumes, dust or the like

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203916C1 (fr) * 1992-02-11 1993-04-29 Hannelore 8400 Regensburg De Roehl-Hager
JP2920495B2 (ja) * 1996-04-16 1999-07-19 善洋 山田 遊煙通路を備えたレンヂフード
DE10015666A1 (de) * 1999-12-14 2001-06-28 Georg Emanuel Koppenwallner Verfahren und Einrichtung zum Erfassen, Trennen und Absaugen von fluiden Medien unter Verwendung von Frontalwirbelgeneratoren
KR100384700B1 (ko) * 2001-06-04 2003-05-23 주식회사 엑타 주방용 배기 후드
KR100347959B1 (en) 2001-12-28 2002-08-21 Ecta Co Ltd Ventilation hood for kitchen
JP4541672B2 (ja) 2003-09-25 2010-09-08 富士工業株式会社 Ｉｈクッキングヒータ用のレンジフード
JP4495474B2 (ja) 2004-02-02 2010-07-07 富士工業株式会社 Ｉｈクッキングヒータ用のレンジフード
KR100644837B1 (ko) * 2004-11-10 2006-11-10 엘지전자 주식회사 배기후드

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6336451B1 (en) 1996-04-04 2002-01-08 Roehl-Hager Hannelore Process and device for confining, retaining and sucking off fumes, dust or the like

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1757865A2 (fr) * 2005-08-23 2007-02-28 LG Electronics Inc. Hotte d'aspiration
EP1757865A3 (fr) * 2005-08-23 2013-07-03 LG Electronics Inc. Hotte d'aspiration
CN101646904B (zh) * 2007-03-20 2011-09-07 Bsh博施及西门子家用器具有限公司 抽油烟机
WO2017012630A1 (fr) * 2015-07-23 2017-01-26 Diehl Ako Stiftung & Co. Kg Hotte aspirante et procédé pour faire fonctionner une hotte aspirante

Also Published As

Publication number Publication date
KR100664068B1 (ko) 2007-01-03
EP1757871A3 (fr) 2008-12-03

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