EP2151632A1 - Ecological kitchen hood and method for reducing thermal energy dispersion - Google Patents

Ecological kitchen hood and method for reducing thermal energy dispersion Download PDF

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Publication number
EP2151632A1
EP2151632A1 EP09009595A EP09009595A EP2151632A1 EP 2151632 A1 EP2151632 A1 EP 2151632A1 EP 09009595 A EP09009595 A EP 09009595A EP 09009595 A EP09009595 A EP 09009595A EP 2151632 A1 EP2151632 A1 EP 2151632A1
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EP
European Patent Office
Prior art keywords
internal environment
hood
aperture
kitchen hood
temperature
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Granted
Application number
EP09009595A
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German (de)
French (fr)
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EP2151632B1 (en
Inventor
Mario Cipriani
Stefano Socci
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Faber SpA
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Faber SpA
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    • 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
    • F24C15/2021—Arrangement or mounting of control or safety systems

Definitions

  • the present invention relates to an ecological kitchen hood and relative method for reducing thermal energy dispersion during its exhausting operation in accordance with the introduction to the main claims.
  • Traditional kitchen hoods are known to be provided with an exhaust fan and can operate in two ways, namely: exhausting, by which the air flow drawn from the environment in which the hood is located (internal environment) is totally fed through an exhaust conduit to the outside (external environment); or filtering, by which the air flow drawn from the internal environment is conveyed through a filtering conduit towards filters (for example active carbon filters) before being returned to the internal environment.
  • exhausting by which the air flow drawn from the environment in which the hood is located (internal environment) is totally fed through an exhaust conduit to the outside (external environment); or filtering, by which the air flow drawn from the internal environment is conveyed through a filtering conduit towards filters (for example active carbon filters) before being returned to the internal environment.
  • filters for example active carbon filters
  • the choice of operation type is generally made by the user on installing the kitchen hood, by closing either the exhaust conduit or the filtering conduit for example by means of a baffle.
  • the hood is arranged for exhausting operation as this is much more efficient in eliminating odours originating from food cooking.
  • this solution has the drawback that, particularly during winter, the air flow W drawn from the internal environment Al by the kitchen hood C, as shown in Figure 1 , has a temperature much higher than the temperature of the external environment AE.
  • the exit of a flow W of heated air from the internal environment Al has to be compensated by the entry, for example through shutters S1 and/or appropriate aeration grids S2, of a corresponding flow F1 and F2 of air colder than the expelled air.
  • a further quantity of thermal energy has therefore to be used to return the temperature of the internal environment (Al) to comfortable values after the hood C has expelled to the external environment (AE) a quantity of odour-containing hot air originating from a coking hob P.
  • the object of the present invention is therefore to provide an ecological kitchen hood to reduce thermal energy dispersion when operating by exhaustion.
  • this shows an ecological kitchen hood 1 comprising a housing 2 in which exhaust means 3, for example a fan, are fixed.
  • the housing 2 has at least one first aperture 4 leading to the external environment AE and at least one second aperture 5 leading to the internal environment Al.
  • the hood 1 is provided with closure means 6A, 6B able to assume a first position enabling the hood 1 for filtering operation.
  • the closure means 6B can close the first aperture 4 to allow an air flow drawn from the internal environment Al by the fan 3 to be completely fed into the internal environment Al after passing through conventional filter means 7.
  • the closure means 6 can also assume a second position to enable the hood 1 for exhausting operation.
  • the closure means 6B can also leave the first aperture 4 at least partially open to enable an air flow drawn from the internal environment Al by the fan 3 to be at least partially expelled to the external environment, as shown in Figure 4 .
  • total filtering operation Figure 3 when the temperature of the external environment is very low, total filtering operation Figure 3 can be enabled, whereas when particularly efficient odour elimination is required, exhausting operation Figure 2 be enabled.
  • the closure means 6 also enable the first aperture 4 to be opened only partially such that only a portion of the indrawn flow is expelled to the external environment (AE) while a portion of the indrawn flow is returned to the internal environment (IA) after being filtered.
  • This second operating position can be used in particular to expel a more or less large flow quantity drawn from the internal environment (Al).
  • the closure means 6 comprise two solenoid valves 6A and 6B arranged to tightly close the first and second aperture 4, 5 respectively, such as to set the type of operation for the hood 1.
  • the kitchen hood 1 comprises drive means (not shown in the figures) to move said closure means 6 into the first and second operating position, and control means (not shown in the figures) connected to the drive means, to pilot the closure means 6 into one of the operating positions.
  • the kitchen hood comprises a first temperature sensor to measure the temperature of the external environment (AE), a second temperature sensor to measure the temperature of the internal environment (Al), and means for calculating the difference between the measured temperatures and comparing these temperatures (not shown in the figures).
  • AE external environment
  • Al internal environment
  • means for calculating the difference between the measured temperatures and comparing these temperatures not shown in the figures.
  • the filter means 7 are positioned downstream of the second aperture 5.
  • the filter means 7 can be easily replaced and moreover only the recycled air flow passes through the filters, hence reducing wear and extending their life.
  • the hood is enabled for filtering operation, otherwise it is enabled for exhausting operation.
  • this external environment temperature can be measured by the user, who then manually arranges for filtering operation, or by a temperature sensor connected to control means provided in the hood to enable its filtering or exhausting operation. In this manner, each time an external environment temperature less than the reference temperature is sensed by the sensor, filtering operation is enabled for the hood.
  • exhausting operation is normally enabled during summer while at least partially filtering operation is enabled during the colder periods of the year.
  • a further control can be provided for enabling filtering or exhausting operation of the described hood.
  • hood filtering operation is enabled if the temperature of the external environment AE during winter is less that that of the internal environment Al by a predetermined value.
  • this further regulating parameter enables filtering operation only when there is an internal/external temperature difference such as to introduce into the internal environment Al air which is decidedly colder than the air currently present, hence making regulation of the hood operation more accurate.
  • the hood 1 remains enabled for filtering operation for rates of flow drawn from the internal environment which are less than a predetermined value, whereas the hood is enabled for at least partially exhausting operation for rates of flow drawn from the internal environment which are greater than this predetermined value.
  • the hood 1 of the invention will provide filtering operation for low speeds of the exhaust means conventionally provided in kitchen hoods, and an at least partially exhausting operation for high speeds.
  • the filtering capacity of conventional carbon filters is insufficient such that, advantageously according to the invention, the air drawn from the internal environment for high flows can be conveyed at least partially towards the external environment such as to make the elimination of odours originating from food cooking more effective. Consequently, exhausting or at least partially exhausting operation is enabled only when a particularly effective odour elimination action is required.
  • the method and hood of the invention enables thermal energy dispersion due to exhausting operation of a kitchen hood to be minimized.
  • this at least partially exhausting operation is enabled only for particularly high air flows which would not allow sufficient filtration by the active carbon filters.

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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)
  • Superstructure Of Vehicle (AREA)

Abstract

A kitchen hood (1) comprises a housing (2) in which a fan (3) is fixed. The housing (2) has at least one first aperture (4) leading to the ambient (AE) and at least one second aperture (5) leading to the internal environment (AI). The hood (1) also comprises closure means (flap 6) able to assume a first position for filtering operation in which they close said first aperture (4) to enable a flow of air drawn from the internal environment (AI) by the fan (3) to be totally fed into the internal environment (AI) after passing through filter means (7), and a second position for exhausting operation which leaves said first aperture (4) at least partially open to allow a flow of air drawn from the internal environment (AI) by the fan (3) to be at least partially expelled to the ambient (AE).

Description

  • The present invention relates to an ecological kitchen hood and relative method for reducing thermal energy dispersion during its exhausting operation in accordance with the introduction to the main claims.
  • Traditional kitchen hoods are known to be provided with an exhaust fan and can operate in two ways, namely: exhausting, by which the air flow drawn from the environment in which the hood is located (internal environment) is totally fed through an exhaust conduit to the outside (external environment); or filtering, by which the air flow drawn from the internal environment is conveyed through a filtering conduit towards filters (for example active carbon filters) before being returned to the internal environment.
  • The choice of operation type is generally made by the user on installing the kitchen hood, by closing either the exhaust conduit or the filtering conduit for example by means of a baffle.
  • Generally, if the user has an available outlet to the external environment, the hood is arranged for exhausting operation as this is much more efficient in eliminating odours originating from food cooking.
  • Although advantageous from various aspects, this solution has the drawback that, particularly during winter, the air flow W drawn from the internal environment Al by the kitchen hood C, as shown in Figure 1, has a temperature much higher than the temperature of the external environment AE. The exit of a flow W of heated air from the internal environment Al has to be compensated by the entry, for example through shutters S1 and/or appropriate aeration grids S2, of a corresponding flow F1 and F2 of air colder than the expelled air.
  • A further quantity of thermal energy has therefore to be used to return the temperature of the internal environment (Al) to comfortable values after the hood C has expelled to the external environment (AE) a quantity of odour-containing hot air originating from a coking hob P.
  • Hence although particularly effective in removing odours, a kitchen hood C operating by exhaustion results in a considerable dispersion of thermal energy.
  • The object of the present invention is therefore to provide an ecological kitchen hood to reduce thermal energy dispersion when operating by exhaustion.
  • This object is attained by a kitchen hood and relative operating method the inventive characteristics of which are highlighted in the accompanying claims.
  • The invention will be more apparent from the ensuing detailed description, provided by way of non-limiting example, of one embodiment thereof illustrated in the accompanying drawings, in which:
    • Figure 1, as stated, shows a schematic setting of a known kitchen hood during operation by exhausting;
    • Figures from 2 to 4 are schematic views of the ecological kitchen hood of the invention during its different types of operation.
  • With reference to Figure 2, this shows an ecological kitchen hood 1 comprising a housing 2 in which exhaust means 3, for example a fan, are fixed. The housing 2 has at least one first aperture 4 leading to the external environment AE and at least one second aperture 5 leading to the internal environment Al. According to the invention, the hood 1 is provided with closure means 6A, 6B able to assume a first position enabling the hood 1 for filtering operation. As shown in Figure 3, the closure means 6B can close the first aperture 4 to allow an air flow drawn from the internal environment Al by the fan 3 to be completely fed into the internal environment Al after passing through conventional filter means 7. The closure means 6 can also assume a second position to enable the hood 1 for exhausting operation. In particular, the closure means 6B can also leave the first aperture 4 at least partially open to enable an air flow drawn from the internal environment Al by the fan 3 to be at least partially expelled to the external environment, as shown in Figure 4.
  • According to the invention, when the temperature of the external environment is very low, total filtering operation Figure 3 can be enabled, whereas when particularly efficient odour elimination is required, exhausting operation Figure 2 be enabled.
  • Advantageously according to the invention, the closure means 6 also enable the first aperture 4 to be opened only partially such that only a portion of the indrawn flow is expelled to the external environment (AE) while a portion of the indrawn flow is returned to the internal environment (IA) after being filtered.
  • This second operating position can be used in particular to expel a more or less large flow quantity drawn from the internal environment (Al).
  • In one embodiment of the invention, the closure means 6 comprise two solenoid valves 6A and 6B arranged to tightly close the first and second aperture 4, 5 respectively, such as to set the type of operation for the hood 1.
  • For example, the kitchen hood 1 comprises drive means (not shown in the figures) to move said closure means 6 into the first and second operating position, and control means (not shown in the figures) connected to the drive means, to pilot the closure means 6 into one of the operating positions.
  • In a particularly advantageous embodiment, the kitchen hood comprises a first temperature sensor to measure the temperature of the external environment (AE), a second temperature sensor to measure the temperature of the internal environment (Al), and means for calculating the difference between the measured temperatures and comparing these temperatures (not shown in the figures). In this manner by acting on the control means on the basis of the calculated difference, one of the operating positions can be selected, as can the flow quantity to be expelled by operating to a greater or lesser extent the closure means 6 acting on the aperture 4.
  • Advantageously according to the invention, the filter means 7 are positioned downstream of the second aperture 5.
  • In this manner, the filter means 7 can be easily replaced and moreover only the recycled air flow passes through the filters, hence reducing wear and extending their life.
  • Hence a method is described for reducing thermal energy dispersion due to the aforedescribed exhausting operation of the kitchen hood.
  • In particular, if the temperature of the external environment is less than a reference temperature, the hood is enabled for filtering operation, otherwise it is enabled for exhausting operation.
  • For example, this external environment temperature can be measured by the user, who then manually arranges for filtering operation, or by a temperature sensor connected to control means provided in the hood to enable its filtering or exhausting operation. In this manner, each time an external environment temperature less than the reference temperature is sensed by the sensor, filtering operation is enabled for the hood.
  • Hence exhausting operation is normally enabled during summer while at least partially filtering operation is enabled during the colder periods of the year.
  • Advantageously, a further control can be provided for enabling filtering or exhausting operation of the described hood. In particular, hood filtering operation is enabled if the temperature of the external environment AE during winter is less that that of the internal environment Al by a predetermined value. In other words, this further regulating parameter enables filtering operation only when there is an internal/external temperature difference such as to introduce into the internal environment Al air which is decidedly colder than the air currently present, hence making regulation of the hood operation more accurate.
  • In particular, during winter, assuming the external reference temperature to be 14°C and the internal/external temperature difference to be 5°C (reference quantity), if the temperature of the external environment AE is 14°C while that of the internal environment Al is 16°C, this further control forces the hood to undergo an exhausting operation which is more effective for extracting odours.
  • Advantageously according to the invention, the hood 1 remains enabled for filtering operation for rates of flow drawn from the internal environment which are less than a predetermined value, whereas the hood is enabled for at least partially exhausting operation for rates of flow drawn from the internal environment which are greater than this predetermined value.
  • For example the hood 1 of the invention will provide filtering operation for low speeds of the exhaust means conventionally provided in kitchen hoods, and an at least partially exhausting operation for high speeds. In particular, for indrawn flow values greater than 500 m3/h, the filtering capacity of conventional carbon filters is insufficient such that, advantageously according to the invention, the air drawn from the internal environment for high flows can be conveyed at least partially towards the external environment such as to make the elimination of odours originating from food cooking more effective. Consequently, exhausting or at least partially exhausting operation is enabled only when a particularly effective odour elimination action is required.
  • In conclusion, the method and hood of the invention enables thermal energy dispersion due to exhausting operation of a kitchen hood to be minimized. Advantageously, when the external temperature is less than a predetermined value and the external temperature is less than the internal temperature by a predetermined delta, according to the invention, this at least partially exhausting operation is enabled only for particularly high air flows which would not allow sufficient filtration by the active carbon filters.

Claims (8)

  1. A kitchen hood (1) comprising a housing (2) in which exhaust means (3) are fixed, said housing (2) having at least one first aperture (4) leading to the external environment (AE) and at least one second aperture (5) leading to the internal environment (Al), characterised by comprising valve means (6) able to assume a first position for filtering operation in which they close said first aperture (4) to enable a flow of air drawn from the internal environment (Al) by the exhaust means (3) to be totally fed into the internal environment (Al) after passing through filter means (7), and a second position for exhausting operation which leaves said first aperture (4) at least partially open to allow a flow of air drawn from the internal environment (Al) by the exhaust means (3) to be at least partially expelled to the external environment (AE).
  2. A kitchen hood as claimed in claim 1, characterised in that said closure means (6) comprise two solenoid valves (6A, 6B) arranged to tightly close said first and said second aperture (4, 5) respectively.
  3. A kitchen hood as claimed in claim 1, characterised by comprising drive means for said closure means (6), to bring said closure means into the first and second operating position, and control means connected to said drive means to pilot the closure means (6) into one of the two operating positions.
  4. A kitchen hood as claimed in claim 1, characterised by comprising a first temperature sensor to measure the temperature of the external environment (AE), a second temperature sensor to measure the temperature of the internal environment (Al), and means for calculating the difference between the measured temperatures and for comparing these temperatures to select one of the two operating positions.
  5. A kitchen hood as claimed in claim 1, characterised in that said filter means (7) are positioned downstream of said second aperture (5).
  6. A method for reducing thermal energy dispersion during exhausting operation of a kitchen hood claimed in claim 1, wherein if the temperature of the external environment is less than a reference temperature, said kitchen hood is enabled for filtering operation, otherwise said kitchen hood is enabled for at least partially exhausting operation.
  7. A method as claimed in claim 6, characterised in that filtering operation is enabled if the temperature of the external environment is also less than that of the internal environment by a predetermined value.
  8. A method as claimed in claim 6 or 7, characterised in that the hood remains enabled for filtering operation for rates of flow drawn from the internal environment which are less than a predetermined value, whereas the hood is enabled for at least partially exhausting operation for rates of flow drawn from the internal environment which are greater than this predetermined value.
EP09009595.1A 2008-08-06 2009-07-24 Ecological kitchen hood and method for reducing thermal energy dispersion Active EP2151632B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001484A ITMI20081484A1 (en) 2008-08-06 2008-08-06 ECOLOGICAL KITCHEN HOOD AND ITS METHOD TO REDUCE THE DISPERSION OF THERMAL ENERGY DURING ITS SUCTION FUNCTION

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EP2151632A1 true EP2151632A1 (en) 2010-02-10
EP2151632B1 EP2151632B1 (en) 2015-11-11

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2487424A1 (en) 2011-02-11 2012-08-15 Miele & Cie. KG Vapour extractor for an oven, a hotplate or similar
EP2789921A1 (en) * 2013-04-09 2014-10-15 Silverline Küchengeräte und Handel GmbH Extractor hood
WO2016020382A1 (en) * 2014-08-08 2016-02-11 BSH Hausgeräte GmbH Odor filter module, range hood device, and method for operating a range hood device
CN105674369A (en) * 2016-03-23 2016-06-15 浙江汉丰风机有限公司 Lampblack purifying fan all-in-one machine
CN111623389A (en) * 2019-02-28 2020-09-04 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
CN111623385A (en) * 2019-02-28 2020-09-04 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
CN111623387A (en) * 2019-02-28 2020-09-04 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
EP4446659A1 (en) * 2023-04-14 2024-10-16 Microjet Technology Co., Ltd. Range hood

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2033133B1 (en) 2022-09-26 2024-04-03 Bos Fornuizen B V Extractor assembly for a household stove, stove arrangement, and working method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121569A (en) * 1976-06-28 1978-10-24 Rangaire Corporation Venting and recirculating vent kitchen hood
US4266528A (en) * 1978-12-13 1981-05-12 The Celotex Corporation Ducted/ductless range hood
EP0050277A2 (en) * 1980-10-18 1982-04-28 Bosch-Siemens HausgerÀ¤te GmbH Air-conditioning apparatus, in particular exhaust hood to be mounted above ranges or the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121569A (en) * 1976-06-28 1978-10-24 Rangaire Corporation Venting and recirculating vent kitchen hood
US4266528A (en) * 1978-12-13 1981-05-12 The Celotex Corporation Ducted/ductless range hood
EP0050277A2 (en) * 1980-10-18 1982-04-28 Bosch-Siemens HausgerÀ¤te GmbH Air-conditioning apparatus, in particular exhaust hood to be mounted above ranges or the like

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2487424A1 (en) 2011-02-11 2012-08-15 Miele & Cie. KG Vapour extractor for an oven, a hotplate or similar
DE102011000654A1 (en) 2011-02-11 2012-08-16 Miele & Cie. Kg Extractor hood for a stove, a hob or the like
EP2789921A1 (en) * 2013-04-09 2014-10-15 Silverline Küchengeräte und Handel GmbH Extractor hood
WO2016020382A1 (en) * 2014-08-08 2016-02-11 BSH Hausgeräte GmbH Odor filter module, range hood device, and method for operating a range hood device
CN105674369A (en) * 2016-03-23 2016-06-15 浙江汉丰风机有限公司 Lampblack purifying fan all-in-one machine
CN111623389A (en) * 2019-02-28 2020-09-04 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
CN111623385A (en) * 2019-02-28 2020-09-04 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
CN111623387A (en) * 2019-02-28 2020-09-04 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
CN111623385B (en) * 2019-02-28 2021-11-02 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
CN111623387B (en) * 2019-02-28 2021-11-02 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
CN111623389B (en) * 2019-02-28 2021-11-12 宁波方太厨具有限公司 Electric valve flow self-adaptive control method of range hood
EP4446659A1 (en) * 2023-04-14 2024-10-16 Microjet Technology Co., Ltd. Range hood

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Publication number Publication date
EP2151632B1 (en) 2015-11-11
DK2151632T3 (en) 2016-01-11
ITMI20081484A1 (en) 2010-02-07

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