EP1887286B1 - Improvement in the ventilation arrangement of a fume extraction hood - Google Patents
Improvement in the ventilation arrangement of a fume extraction hood Download PDFInfo
- Publication number
- EP1887286B1 EP1887286B1 EP20070113229 EP07113229A EP1887286B1 EP 1887286 B1 EP1887286 B1 EP 1887286B1 EP 20070113229 EP20070113229 EP 20070113229 EP 07113229 A EP07113229 A EP 07113229A EP 1887286 B1 EP1887286 B1 EP 1887286B1
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- EP
- European Patent Office
- Prior art keywords
- extractor hood
- hood according
- cylindrical member
- air
- suction
- 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.)
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- 239000003517 fume Substances 0.000 title claims description 14
- 238000009423 ventilation Methods 0.000 title claims description 7
- 238000000605 extraction Methods 0.000 title description 6
- 238000010411 cooking Methods 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000009830 intercalation Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
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
Definitions
- the present invention refers to an improved kind of extractor hood for extracting fumes and vapours from a closed room and exhausting them outside, as provided with improved means adapted to perform the task of conveying and exhausting said fumes and vapours in a particularly quick, efficient and cost-effective manner.
- JP 02-183750 is an extractor hood that generates a vortex, which is generally of assistance to the circulation and the exhaustion of the gases being extracted; such vortex is brought about by at least a blowing port located vertically and laterally relative to the same hood.
- JP 01-114650 is an extractor hood that is provided on its lower side with a circular member having appropriate perforations distributed all over it, from which related air flows are ejected so as to bring about a whirling, i.e. vortex-like circulation inside them and, as a result, even in the space therebelow.
- a circular member having appropriate perforations distributed all over it, from which related air flows are ejected so as to bring about a whirling, i.e. vortex-like circulation inside them and, as a result, even in the space therebelow.
- Such circular member is capable of being oriented and located exactly in the preferred position above the burner or hotplate generating the fumes that are to be extracted.
- JP 9042734 is a further kind of extractor hood that is adapted to generate an air vortex in the region lying therebelow.
- this solution has the drawback of being scarcely effective owing to the fact that said air vortex is brought about by an air stream issuing obliquely downwards from the same hood and, therefore, from a certain distance from the zone where the fumes and gases to be extracted are generated, i.e. the cooking surface or hob, so that its capacity to adequately invest and affect the desired zone above the cooking surface or hob turns out as being quite modest, actually.
- JP 11-311432 Disclosed in JP 11-311432 is an extractor hood that is provided with means adapted to create, in the region lying therebelow, an air circulation of a rotary vortex, i.e. whirling kind. Even in this case, however, the air circulation is brought about by the action of a single suction fan that at the same time brings about also the whirling, vortex-like circulation generated from above.
- a hood according to the prior art and the present invention comprises:
- said ventilation means comprise:
- each one of said outflow channels 13 is in a generally cylindrical or prismatic shape, and is further provided with one or more outflow ports 14, which are:
- outflow ports are arranged in a coherent manner, in the sense that the outflow ports of two contiguous channels 13 are in no case opposing each other, but are rather turned in the same direction, i.e. facing the same way relative to a single direction of rotation extending horizontally over the inner surface of said cylindrical member 11.
- said cylindrical member 11 terminates at its bottom with a lower rim 120 that is abundantly spaced away from the cooking surface or hob 10 lying therebelow, so as to avoid interfering with the good accessibility of said cooking surface from all sides thereof or, still worse, preventing the same cooking surface from being capable of being conveniently accessed to from all sides thereof by an operator.
- the inner portion of said cylindrical member 11 is provided with the afore-described plurality of outflow ports 14 in an arrangement in which they are distributed with a certain regularity along the perimeter of such portion.
- the same air streams will be blown out through said outflow ports 14, thereby being converted into respective air jets "g" that are blown in a concordant manner all along the inner surface of said cylindrical member 11.
- the air velocity at such point can be represented by a vector having three components, i.e. an ascensional or upward component, a radial component directed towards said axis X, and a third tangential component.
- Such curve can be noticed to show a descending trend towards both extremities thereof, whereas in an intermediate position thereof the same curve reaches a peak at a point M.
- inventive extractor hood may be provided with a filtering member 25, which - for it to be conveniently accessible and, at the same time, be prevented from interfering with the rotary, i.e. whirling circulation of the air under the hood - is preferably provided in the shape of a frustum of a cone and is applied immediately under said suction mouth 24.
- a further advantageous embodiment of the present invention calls for said outflow ports to be provided in the form of a sequence of slots 33 opening onto the inner perimeter 30 of a horizontal channel 31 provided inside said cylindrical member 11 immediately underneath said upper planar member 1.
- Such horizontal channel 31 is delimited internally by an alternate sequence of closed vertical surfaces 34, which are spaced from each other by said slots 33, and which determine said inner perimeter 30; it is further delimited externally by a box-like casing 40 substantially coinciding with said cylindrical member 11, and at the bottom by a planar member 41 that is substantially similar and parallel to said upper planar member 1.
- Each one of said closed vertical surfaces 34 is provided at the sides with two respective edges 34A and 34B, wherein said edges are arranged in an alternate manner relative to the complete sequence of the leading and trailing edges of all said surfaces 34; on one 34A of said edges of each such closed surface 34 there is provided a respective airflow-deflecting fin or baffle 37 oriented inwardly, i.e. towards the interior of said channel 31, in a manner that is consistent relative to a single direction of circulation of the air inside said ring-like channel.
- each one of said air-flow deflecting fins 37 forms a member adapted to divert, i.e. deflect the flow of air circulating within said ring-like channel 31.
- the inclination of the fins in general can be easily modified and on the so defined inclination of the fins there depends not only the width of the respective slot, but also the rate and - to a certain extent - also the prevailing inclination of the airflow being blown into said cylindrical member 11 from such slot.
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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)
- Prevention Of Fouling (AREA)
- Superstructure Of Vehicle (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Description
- The present invention refers to an improved kind of extractor hood for extracting fumes and vapours from a closed room and exhausting them outside, as provided with improved means adapted to perform the task of conveying and exhausting said fumes and vapours in a particularly quick, efficient and cost-effective manner.
- Although reference will be made throughout the following description to an extractor hood intended for use in professional kitchens, in particular in the mass catering and commercial foodservice field, where fumes and vapours to be exhausted from the room and, above all, from spaces above cooking surfaces featuring a number of high-power burners or hotplates with a high heat output, are typically generated at high specific volumes (i.e. volumes per unit time), the same description and the explanations set forth hereinafter shall nevertheless be understood as equally applying to extractor hoods of the kind typically intended for household use.
- Various types of extractor hoods are known in the art to in various manners take advantage and make use of the principle of creating a vortex below them in view of improving the circulation of the gases to thereby facilitating the extraction thereof by suction.
Known from the disclosure inJP 02-183750 - Such solution, however, has a drawback in that a hood of this kind must be installed on the side of, i.e. laterally to a support wall, so that it is of practically no use if the intended application calls for an extraction task to be carried out under conditions requiring full freedom from installation constraints of any kind, i.e. conditions that do not allow for any limitations to exist as far as the installation of the hood is concerned, as this is typically true in the case that fume extraction has to take place at the centre of a large and wide room.
- It has to be further pointed out that the same presence of a support wall generally tends to restrain the whirling, i.e. vortex-like circulation of the gases to be extracted, thereby putting limits to the efficiency of the same hood.
- Known from the disclosure in
JP 01-114650 - Although quite flexible from a theoretical point of view, such solution has however a main drawback in that it practically proves scarcely effective due to the limited flow rate at which the air can be blown from the circular member; moreover, the hood lying thereabove is situated at a certain distance from the site where the vortex is generated and this puts further limits to the real effectiveness of the hood according to the solution described in the above-cited patent.
- Known from the disclosure in
JP 9042734 - Described in the patent publications
JP 21311542 JP 2004332967 - Such effect, however, is obtained with the use of a double structure having cone-shaped, parallel walls into and within which there is blown a flow of air that is then directed downwards upon being deflected by a plurality of fins that impart a rotary motion component to such flow.
- Although rather effective, these solutions have however a drawback in that they imply an elaborate, i.e. complex construction and, therefore, are certainly cost-intensive. A major drawback of such solutions, anyway, lies in the fact that the above-mentioned cone-shaped double structure of the hood causes the latter to be very, if not excessively high, making it difficult to install it in normal kitchen spaces.
- Disclosed in
JP 11-311432 - As a result, the vortex-like rotation - owing to its being actually "driven" from above, and not from the side - is extremely low in its effectiveness, which is anyway limited to just a small space lying immediately below the hood.
- Known from the disclosures in
US 4,622,888 ,US 4,550,650 andJP 63-267855 - Now, such situation is scarcely acceptable in all those cases in which access to the working zone has to be capable of being gained from all sides thereof, as this usually occurs when the hood is used to extract fumes, gases and vapours from cooking surfaces, hobs and the like, both in residential and mass-catering applications in general.
- It would therefore be desirable, and is actually a main object of the present invention, to provide a kind of extractor hood, particularly for use in connection to installations involving cooking on a specific cooking surface, which enables access to the cooking zone to be readily and conveniently gained from more sides thereof, is low-cost and simple in its construction and operation, and is nevertheless capable of generating a vortex that is effective in ensuring a fully adequate, consistent circulation of gas or air, as the case may be.
- According to the present invention, this aim, along with further ones that will become apparent from the following disclosure, is reached in an extractor hood for both home and professional applications, which incorporates the features and characteristics as recited in the appended claims.
- Anyway, features and advantages of the hood according to the present invention may be more readily understood from the description that is given below by way of non-limiting example with reference to the accompanying drawings, in which:
-
Figure 1 is a vertical cross-sectional view along a median central axis X of an extractor hood according to the present invention; -
Figure 2 is an upward view along the section plane A-A ofFigure 1 ; -
Figure 3 is a view along the section plane B-B ofFigure 2 ; -
Figure 4 is a similar view as the one inFigure 1 , but showing a symbolical pictorial representation of the air flow being circulated according to a rotary pattern under the hood; -
Figures 5 and6 are projection views on a plane extending orthogonally to said median central axis X and on a plane extending parallel to the same axis X, respectively, of the speed vector at a generic point K in the space under the extractor hood according to the present invention; -
Figure 7 is a graph illustrating the pattern of the tangential component of the speed at said generic point K; -
Figure 8 is a schematic, symbolical view of an improved embodiment of the extractor hood according to the present invention; -
Figures 9 ,10 and 11 are a perspective bottom view, a planar projection bottom view and a partially see-through side view, respectively, of a second improved embodiment of an extractor hood according to the present invention; -
Figure 12 is a perspective, see-through bottom view of an improved embodiment of the invention; -
Figures 13 and14 are respective cut-away views of the embodiment illustrated inFigure 12 ; -
Figure 15 is a simplified plan view of the embodiment illustrated inFigure 12 ; -
Figure 16 is an enlarged view of a portion ofFigure 15 ; -
Figures 17A and17B are views of the hood illustrated inFigure 15 , as viewed in two different operating states thereof. - With reference to
Figures 1 and2 , a hood according to the prior art and the present invention, as well, comprises: - an upper
planar member 1 adapted to intercept, i.e. capture and extract by suction the gases hovering about in the space therebelow, as generally produced by a cooking surface situated thereunder; - one or more suction conduits 2, the suction mouth or
port 24 of which opens into the central zone of said upperplanar member 1 to generally branch off vertically therefrom; - at least a
suction fan 21 housed in said suction conduit 2, adapted to suck in the gases from saidsuction mouth 24 and blow them outside through the exhaust mouth 24B; - ventilation means as generally described in the afore-cited prior art, capable of setting the mass of air lying under said upper
planar member 1 in motion according to a rotary pattern about the vertical axis X centered in saidsuction mouth 24. - According to the present invention, said ventilation means comprise:
- an internally hollow
cylindrical member 11, whose diameter D1 is substantially equal to the outside diameter of said upperplanar member 1, and which is applied on to theouter rim 110 of the latter, so that the outer surface of saidcylindrical member 11 comes to stand in a vertical position; - a plurality of
outflow channels 13, which are:- * vertical,
- * provided in the inner wall of said
cylindrical member 11 and arranged to extend therealong, - * distributed in a substantially uniform manner all over said wall,
- * so sized as to feature a crosswise size d2, i.e. a size on the horizontal plane that is substantially smaller than the diameter D1 of said
cylindrical member 11, so as to avoid interfering with or slowing down the flow of the fumes or gases that are sucked in from the bottom upwards through said suction conduit.
- With reference to
Figure 3 , each one of saidoutflow channels 13 is in a generally cylindrical or prismatic shape, and is further provided with one ormore outflow ports 14, which are: - provided in the respective cylindrical surface,
- oriented on the horizontal plane,
- and further oriented (
Figure 2 ) in a direction "a" that is substantially parallel to the horizontal tangent "t" to the surface of saidcylindrical member 11 at the point P, at which the respective outflow channel is applied on to the samecylindrical member 11. - In addition, said outflow ports are arranged in a coherent manner, in the sense that the outflow ports of two
contiguous channels 13 are in no case opposing each other, but are rather turned in the same direction, i.e. facing the same way relative to a single direction of rotation extending horizontally over the inner surface of saidcylindrical member 11. - Furthermore, said
cylindrical member 11 terminates at its bottom with alower rim 120 that is abundantly spaced away from the cooking surface orhob 10 lying therebelow, so as to avoid interfering with the good accessibility of said cooking surface from all sides thereof or, still worse, preventing the same cooking surface from being capable of being conveniently accessed to from all sides thereof by an operator. - Briefly, therefore, the inner portion of said
cylindrical member 11 is provided with the afore-described plurality ofoutflow ports 14 in an arrangement in which they are distributed with a certain regularity along the perimeter of such portion.
As a result, if respective air streams are blown into saidoutflow channels 13, the same air streams will be blown out through saidoutflow ports 14, thereby being converted into respective air jets "g" that are blown in a concordant manner all along the inner surface of saidcylindrical member 11. - These individual air jets will then immediately turn into a single air circulation that takes the form of a vortex moving spirally as a whirlwind round the axis X of said
cylindrical member 11, wherein such vortex will of course be contained within the volume being defined by saidcylindrical member 11. - It has however been found - and this is the real value of the present invention - that said vortex does not remain delimited within said
cylindrical member 11, actually, but tends to expand therebelow, to thereby produce a rather evident, marked entrainment effect, which will by the way be all the more marked the closer thecooking surface 10 is to thecylindrical member 11. - It has been demonstrated that, due to the effect of such vortex occurring externally, i.e. below said
cylindrical member 11, the gases diffusing under saidcylindrical member 11 are specifically conveyed into the roughly conical geometrical contour formed by the curved walls indicated at V inFigure 4 . - The ultimate result of such entrainment effect of the fumes, i.e. gases being so whirled in the space between said
cylindrical member 11 and saidcooking surface 10 is a quite more efficient suction effect of said gases, which is moreover further enhanced by the improved manner in which the same gases being sucked in, i.e. extracted are practically contained within said conical configuration V, so that any possibility for the same gases to leak and diffuse into the ambient where the hood is installed is greatly reduced, if not fully prevented. - In view of further enhancing to an optimum level the general performance capabilities of the inventive extractor hood as this has been described hereinbefore, the various design, i.e. geometrical and dimensional parameters, as well as the various operating parameters that most affect and directly determine such performance capabilities of the hood have been thoroughly and systematically investigated on an experimental basis. As all those skilled in the art are well aware with, such investigating activity is usually and normally carried out in the simplest, but at the same time quite effective form thereof, by practically avoiding to go through a sequence of experiments that have been planned, i.e. designed on the basis of criteria that are characteristic of the so-called fractional factorial experiments, while performing on the contrary a set of experiments, in which a factor or parameter is varied each time within a range of values that said factor or parameter is therefore caused to take sequentially, all other factors or parameters remaining unaltered in the process.
- The result obtained in each such experiment is duly measured to ultimately identify - for each parameter - a range of values, to which there correspond performance results being considered or selected as preferential or desired ones.
- On the other hand, such procedure is largely known to all those being familiar with statistical analysis techniques, so that it shall not be explained any further here.
- Anyway, the parameters that have been selected for experimental investigation in the particular case being considered will be indicated and described later on.
- Briefly, on the basis of an adequate number of properly designed and performed experiments, there have been identified the following optimum variation ranges for the parameters indicated below, which are generally applicable to extractor hoods to be used above cooking surfaces in professional and similar kitchens:
- angle between the direction "a", in which said outflow ports are oriented, and the direction of the tangent to said cylindrical member at the point of application P of the respective outflow channel,
>>>>>>>> smaller than 10°; - ratio of the height (h1) of said
cylindrical member 11 to the diameter D1 of said upperplanar member 1,
>>>>>>>> ranging from 3.5 to 4.0; - ratio of the sum of the flow rates of said
outflow ports 14 to the flow rate of said suction conduit 2,
>>>>>>>> ranging from 0.6 to 1.0; - air replacement frequency, i.e. the number of times the air contained within the
cylindrical member 11 is replaced by the air blown from saidoutflow ports 14 per unit of time (can also be calculated if the volume of said cylindrical member and the overall flow rate of said outflow ports are known),
>>>>>>>> ranging from 35 to 45 times per minute; - angular velocity of the rotary, i.e. whirling circulation of the air, as measured along the outermost perimeter,
>>>>>>>> ranging from 50 to 60 rpm; - ratio of the distance - as calculated on the surface of said cylindrical member - of two
contiguous outflow channels 13 to each other, to the height h1 of the same cylindrical member,
>>>>>>>> ranging from 1.2 to 1.8; - ratio of the outflow velocity of the air from said
outflow ports 14 to the angular velocity of the rotary, i.e. whirling circulation of the air, as measured along the outermost perimeter,
>>>>>>>> ranging from 4.0 to 6.0. - It should at this point be noticed that, for each point in the space below said
cylindrical member 11, the air velocity at such point can be represented by a vector having three components, i.e. an ascensional or upward component, a radial component directed towards said axis X, and a third tangential component. - On the basis of the above-cited experiments, and with particular reference to
Figure 5 , in which the projection on a plane n extending orthogonally to said axis X of the velocity vector A of the air at a generic point K is illustrated, and toFigure 6 , which shows a possible radial component Vr of the same air velocity vector on the same plane n, but as viewed from the same axis X, it has also been found that the trend or course of said tangential component Vt of the velocity of the air being sucked in, for each plane n extending orthogonally to said axis X and situated at a generic distance d from saidlower rim 120 of saidcylindrical member 11, follows a pattern that may be represented by the curve C inFigure 7 . - Such curve can be noticed to show a descending trend towards both extremities thereof, whereas in an intermediate position thereof the same curve reaches a peak at a point M.
- In the course of the above-described experiments it has also been found that a particular advantageous suction effect, i.e. extraction performance is reached if said tangential velocity component Vt and radial velocity component Vr, at said point M where the tangential velocity component Vt is at a maximum, for a generic point in the space lying below said
cylindrical member 11, have such values as to ensure that the Vt/Vr ratio is greater than 0.50. - This basically represents the fact that the air must circulate, i.e. flow with a rotary or spiral-like, i.e. whirling motion that is at least comparable with the radial motion directed towards the centre; and such condition is specifically achieved with a hood according to the present invention, rather than with a hood according to the prior art.
- However, since such ratio is an effect of each and any possible combination of the mechanical and operational features of the present invention, further to the distance of the extractor hood from the cooking surface or hob lying therebelow, and since such features and parameters may vary to even quite remarkable an extent, the present teaching suggests that such features and parameters should be combined, actually, which will result in an air circulation being generated altogether that best complies with such constraint.
- With reference to
Figure 8 , this can be noticed to symbolically illustrate a schematical representation of the means used to generate both the suction air flow and the whirling air circulation; in view of avoiding a needless duplication of the motors used to drive thesuction fan 21 and the blower orfan 22 used to circulate the air being blown into and through said outflow channels, such fans are associated to and driven by asingle motor 23; this solution is particularly advantageous considering the fact that the extractor hood generally operates under substantially constant, steady working conditions, so that there is no practical need for two different motors to be used in view of generating two different air flows at variable velocities or rates. - With reference to
Figures 9 to 11 , it has also been found that it may be quite advantageous for the inventive extractor hood to be provided with a filteringmember 25, which - for it to be conveniently accessible and, at the same time, be prevented from interfering with the rotary, i.e. whirling circulation of the air under the hood - is preferably provided in the shape of a frustum of a cone and is applied immediately under saidsuction mouth 24. - It has further been experimentally confirmed that the performance capabilities of the above-described extractor hood are conditional to the distance of such hood from the cooking surface or
hob 10 lying therebelow; in particular, it has been experimentally found that an improvement in the overall suction, i.e. extraction efficiency is obtained when the inventive extractor hood is installed and located in such manner relative to said cooking surface or hob 10 (seeFigure 1 ) as to ensure that the ratio of the largest horizontal size D1 of saidcylindrical member 11 to the distance Hs of saidlower rim 120 to thesame cooking surface 10 lies within 0.75 and 1.0. - With reference to
Figures 12 through to 16, a further advantageous embodiment of the present invention calls for said outflow ports to be provided in the form of a sequence ofslots 33 opening onto the inner perimeter 30 of ahorizontal channel 31 provided inside saidcylindrical member 11 immediately underneath said upperplanar member 1. - Such
horizontal channel 31 is delimited internally by an alternate sequence of closedvertical surfaces 34, which are spaced from each other by saidslots 33, and which determine said inner perimeter 30; it is further delimited externally by a box-like casing 40 substantially coinciding with saidcylindrical member 11, and at the bottom by aplanar member 41 that is substantially similar and parallel to said upperplanar member 1. - Each one of said closed
vertical surfaces 34 is provided at the sides with tworespective edges surfaces 34; on one 34A of said edges of each suchclosed surface 34 there is provided a respective airflow-deflecting fin or baffle 37 oriented inwardly, i.e. towards the interior of saidchannel 31, in a manner that is consistent relative to a single direction of circulation of the air inside said ring-like channel. - In practice, each one of said air-
flow deflecting fins 37 forms a member adapted to divert, i.e. deflect the flow of air circulating within said ring-like channel 31. - As a result, when an airflow is blown into said
channel 31, such flow will of course escape outside through saidslots 33; however, before being able to leak through such slots, said flow is clearly deflected and properly channelled by saidfins 37, with the ultimate result that, when said flow eventually blows into saidcylindrical member 11, i.e. practically into the hood, it is almost tangential - on the horizontal plane - to the verticalclosed surface 34 whose fin has deflected it, actually. - Obtained in the above-described manner is practically a kind of extractor hood which, while operating in a manner that is fully in keeping with the principles of the present invention as described hereinbefore, has the advantage of a greater simplicity in construction.
- On the other hand, even this particular embodiment of the present invention may be further improved: in fact, with reference to
Figure 16 , said airflow-deflecting fins are not firmly joined to the respectivevertical surfaces 34. Quite on the contrary, eachsuch fin 37 is rather hinged with aconnection edge 34A thereof on to therespective surface 34. - In this manner, the inclination of the fins in general can be easily modified and on the so defined inclination of the fins there depends not only the width of the respective slot, but also the rate and - to a certain extent - also the prevailing inclination of the airflow being blown into said
cylindrical member 11 from such slot. - For such condition to be able to be more readily and clearly understood, reference should be made to the illustrations in
Figures 17A and17B , which symbolically represent respective horizontal plan views of the above-described embodiment of the inventive hood, wherein the fins or baffles 37 have two distinct and different inclinations A and B relative to therespective surface 34, onto which they are hinged. - In particular, if all such fins or baffles are connected by means of appropriate mechanical means that are adapted to control in a synchronous and similar manner the inclination of such fins or baffles, e.g. by means of an adjusting
ring 38, it can be most readily appreciated that, by acting on such mechanical means, which can be provided in any of a number of manners that are largely known to and well within the ability of all those skilled in the art, so that they shall not be described or explained any further here, the basic characteristics in terms of both flow rate and orientation of the air being blown from said slots are most readily and easily varied in any desired manner.
Claims (14)
- Fume extractor hood comprising:- an upper planar horizontal member (1) adapted to capture and collect vapours and gases flowing up from a cooktop (10) lying therebelow, where the vapours and fumes to be extracted are generated,- a suction conduit (2) that is open in the middle region of said upper planar horizontal member (1),- first suction means associated to said suction conduit and adapted to suck in the fumes and vapours therefrom and blow them outside, wherein such means comprise a suction fan (21) associated to said conduit (2),- ventilation means adapted to impart a whirling motion about a vertical axis (X) to the mixture of air and other gases contained in the volume below said upper planar horizontal member (1),said ventilation means comprising an internally hollow cylindrical member (11), a peripheral edge of which is placed onto the outer edge (110) of said upper planar horizontal member (1), and which extends vertically downwards from said upper planar horizontal member (1) without reaching the level of the cooktop (10) or a similar surface lying therebelow, characterized in that inside said cylindrical member (11) there is defined an internally hollow horizontal channel (31) that is delimited inwardly by an inner perimeter comprising an alternate sequence of substantially vertical, closed surfaces (34) intercalating with a corresponding alternate sequence of respective slots (33), and delimited downwardly by a planar member (41).
- Extractor hood according to claim 1, characterized In that said closed surfaces are provided with respective fins or baffles (37) placed on a respective vertical edge (34A) thereof and oriented so that the alternating sequence of said slots (33) and said bafffes (37) associated to said closed surfaces (34) determines a plurality of outflow ports.
- Extractor hood according to claim 2, characterized in that said fins or baffles (37) are provided with control means adapted to enable the angle of rotation of each such fin or baffle (37) about the respective vertical edge (34A) to be adjusted.
- Extractor hood according to claim 3, characterized in that said fins or baffles (37) are connected by means of mechanical means adapted to control in a synchronous and similar manner the inclination of said fins or baffles (37).
- Extractor hood according to claim 4, characterized in that said mechanical means comprise an adjusting ring (38) connecting said fins or baffles (37).
- Extractor hood according to any of the preceding claims, characterized in that said slots (33) are oriented so that the respective airflows issuing therefrom are blown in a horizontal direction (a) with an inclination that is substantially smaller than 10° relative to the tangent (t) to the circumference of said cylindrical member (11) at the point of application (P) with the respective outflow channel.
- Extractor hood according to any of the preceding claims, characterized in that the ratio of the height (h1) of said cylindrical member (11) to the diameter, or largest dimension (D1), of said upper planar member (1) is situated anywhere between 3.25 and 4.0.
- Extractor hood according to any of the preceding claims, characterized in that the ratio of the sum of the flow rates of said slots (33) to the flow rate of said suction conduit (2) is situated anywhere between 0.6 and 1.0.
- Extractor hood according to any of the preceding claims, characterized in that the air replacement frequency, i.e. the number of times the air contained within said cylindrical member (11) is replaced by the air blown from said slots (33) per unit of time, is situated anywhere between 35 and 45 times per minute.
- Extractor hood according to any of the preceding claims, characterized in that the angular velocity of the rotary, i.e. whirling circulation of said air and fumes, as generated by said ventilation means and measured along the outermost path within said cylindrical member (11), is situated anywhere between 50 and 60 rpm.
- Extractor hood according to any of the preceding claims, characterized in that the ratio of the average outermost tangential velocity (V1) of said rotary or whirling air circulation to the air outflow velocity from said slots (33) is situated anywhere between 4.0 to 6.0.
- Extractor hood according to any of the preceding claims, characterized in that said first suction means and said ventilation means for generating said whirling air circulation comprise respective fans (21, 22), wherein both these fans are mechanically connected to a single and same drive motor (23).
- Extractor hood according to any of the preceding claims, characterized in that close to or at a suction mouth (24) of said suction conduit (2) there is housed a filtering member (25), which at least partially extends into the volume enclosed by said cylindrical member (11) in the shape of a frustum of a cone.
- Cooking assembly comprising:- an extractor hood according to any of the preceding claims;- a cooking surface or hob (10) lying below the extractor hood; characterized in that the ratio of the maximum horizontal dimension of said cylindrical member (11) to the distance of the lower rim (120) thereof from said cooking surface or hob (10) lying therebelow is situated anywhere between 0.75 and 1.0.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09004438.9A EP2088377B1 (en) | 2006-07-27 | 2007-07-26 | Improvement in the ventilation arrangement of a fume extractor hood |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPN20060058 ITPN20060058A1 (en) | 2006-07-27 | 2006-07-27 | SUCTION HOOD WITH PERFECT VENTILATION |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09004438.9A Division EP2088377B1 (en) | 2006-07-27 | 2007-07-26 | Improvement in the ventilation arrangement of a fume extractor hood |
EP09004438.9A Division-Into EP2088377B1 (en) | 2006-07-27 | 2007-07-26 | Improvement in the ventilation arrangement of a fume extractor hood |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1887286A2 EP1887286A2 (en) | 2008-02-13 |
EP1887286A3 EP1887286A3 (en) | 2008-07-16 |
EP1887286B1 true EP1887286B1 (en) | 2014-11-19 |
Family
ID=38511360
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09004438.9A Not-in-force EP2088377B1 (en) | 2006-07-27 | 2007-07-26 | Improvement in the ventilation arrangement of a fume extractor hood |
EP20070113229 Not-in-force EP1887286B1 (en) | 2006-07-27 | 2007-07-26 | Improvement in the ventilation arrangement of a fume extraction hood |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09004438.9A Not-in-force EP2088377B1 (en) | 2006-07-27 | 2007-07-26 | Improvement in the ventilation arrangement of a fume extractor hood |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP2088377B1 (en) |
IT (1) | ITPN20060058A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE549583T1 (en) * | 2008-12-10 | 2012-03-15 | Electrolux Home Prod Corp | EXTRACTOR HOOD |
EP2196737B1 (en) * | 2008-12-10 | 2013-07-03 | Electrolux Home Products Corporation N.V. | Suction Hood |
EP2196738B1 (en) * | 2008-12-10 | 2013-10-23 | Electrolux Home Products Corporation N.V. | Suction hood |
CN102954514B (en) * | 2011-08-27 | 2016-08-17 | 博西华电器(江苏)有限公司 | Smoke exhaust ventilator and tornado generator thereof |
IT201600071188A1 (en) * | 2016-07-07 | 2018-01-07 | B S Service S R L | ASPIRATING HOOD FOR KITCHENS WITH VORTEX FLOW. |
AU2016413663A1 (en) | 2016-07-07 | 2019-01-17 | B.S. Service S.R.L. | Kitchen extractor hood with directional flow |
IT201600071189A1 (en) * | 2016-07-07 | 2018-01-07 | B S Service S R L | ASPIRATING HOOD FOR KITCHENS WITH DIRECTIONAL FLOW. |
US10895386B2 (en) * | 2016-07-07 | 2021-01-19 | B.S. Service S.R.L. | Kitchen extractor hood with vortex flow |
CN106439964B (en) * | 2016-09-30 | 2019-11-12 | 宁波方太厨具有限公司 | A kind of range hood |
CN106594826A (en) * | 2016-12-02 | 2017-04-26 | 宁波方太厨具有限公司 | Rotary suction type extractor hood |
CN106594834B (en) * | 2016-12-23 | 2019-08-23 | 宁波方太厨具有限公司 | A kind of eddy flow auxiliary device of range hood |
CN108105824A (en) * | 2018-01-16 | 2018-06-01 | 青岛海尔智慧厨房电器有限公司 | Smoke sucking device of range hood and range hood |
DE102019206240A1 (en) * | 2019-04-30 | 2020-11-05 | BSH Hausgeräte GmbH | Extractor device, kitchen appliance with hob and extractor device and method for operating an extractor device |
CN112569719B (en) * | 2020-12-21 | 2024-07-02 | 玉环太平洋机械有限公司 | Top suction type oil mist separation purifier |
KR102469350B1 (en) * | 2020-12-21 | 2022-11-23 | 주식회사 포스코 | Dust collecting equipment and dust collecting method |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3208622C1 (en) | 1982-03-10 | 1983-12-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München | Deduction for extracting gases, vapors and suspended matter |
JPS63267855A (en) | 1987-04-24 | 1988-11-04 | Nippon Air Curtain Kk | Local discharge device by artificial swirl generating mechanism |
JPH01114650A (en) | 1987-10-26 | 1989-05-08 | Matsushita Electric Works Ltd | Smoke disposal device for cooking |
JPH02131142A (en) | 1988-11-11 | 1990-05-18 | Usui Internatl Ind Co Ltd | Preparation of metal carrier material for carrying exhaust gas purification catalyst |
JPH02183750A (en) * | 1989-01-06 | 1990-07-18 | Seibu Electric Ind Co Ltd | Range hood |
JPH0942734A (en) | 1995-07-24 | 1997-02-14 | Sun Wave Ind Co Ltd | Exhaust structure around heater |
JPH11311432A (en) | 1997-05-26 | 1999-11-09 | Toto Ltd | Range hood |
JP3327247B2 (en) * | 1999-01-14 | 2002-09-24 | ダイキン工業株式会社 | Ventilation equipment |
JP4526780B2 (en) * | 2003-04-30 | 2010-08-18 | 富士夫 堀 | Food equipment |
DE102005013806A1 (en) * | 2005-03-24 | 2006-09-28 | BSH Bosch und Siemens Hausgeräte GmbH | Extractor hood has suction fan and a flow direction element rotatable in suction area about rotational axis perpendicular to plane of same for improved vapour collection |
-
2006
- 2006-07-27 IT ITPN20060058 patent/ITPN20060058A1/en unknown
-
2007
- 2007-07-26 EP EP09004438.9A patent/EP2088377B1/en not_active Not-in-force
- 2007-07-26 EP EP20070113229 patent/EP1887286B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP1887286A3 (en) | 2008-07-16 |
EP2088377B1 (en) | 2017-06-28 |
EP2088377A3 (en) | 2014-09-17 |
EP2088377A2 (en) | 2009-08-12 |
EP1887286A2 (en) | 2008-02-13 |
ITPN20060058A1 (en) | 2008-01-28 |
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