[0001] The present invention relates to a device for removing gas, vapor, particulate, or
mixed type pollutants, and more particularly, to a range hood generates two air curtains
above the counter top so as to remove pollutants between the two air curtains.
BACKGROUND OF THE INVENTION
[0002] Generally, kitchens, laboratories or dust factories generate gas with grease particles
or toxic gases which are harmful to the people in the sites and pollutes the surroundings.
[0003] Taken the conventional kitchen hood as an example (see for example patent document
WO-98/22755A), as show in Fig. 12, the hood 10 is fixed to an underside of the cabinet 15 in which
a pipe 12 is received. The pipe 12 guides the gas sucked by the hood from the cook
ware and expel the gas out of the kitchen. The cabinet 15 is connected with other
cabinet 16 on the wall 14 to which the hood 10 is connected and the other wall 13
that is perpendicular to the wall 14 is in contact with a side of the hood 10. The
oven 18 is installed in the counter top 17 and includes two burners 19. The counter
top 17 is connected on the top of yet another cabinet 20. The hood 10 includes two
suction fans 11 which are located above the burners 19 so as to suck the gas from
the cook ware into the hood 10 and the gas can be expelled out side of the kitchen
via the pipe 12.
[0004] The conventional range hoods 10 used in kitchens are similar to a canopy hood which
is used in working sites. As shown in Fig. 13, the upward speed of the gas flow decreases
quickly with the increase of the downward distance beneath the suction face. At the
distance further than about 1.5 times of the diameter of the suction opening, the
upward velocity becomes negligibly small and the suction force would not be large
enough to draw effectively the gas. Therefore, the effective suction distance beneath
the canopy hood is generally within about 1.5 times of the diameter of the suction
opening. Besides, because of the characteristics of the suction flow field of the
canopy hood, the gas flow can easily be affected by drafts such as the air flows generated
from fans, air conditioning device, people walking by, opening or closing doors or
windows, etc. When such interference air flows exist, as shown in Fig. 14, the flow
field beneath the canopy hood would be modified drastically and the capture zone will
become an area like the half-oval enclosed in a dividing streamline. The larger the
ratio of the interference air flow speed to the suction speed presents, the smaller
the capture zone becomes. When this situation happens, the grease particles, toxic
gases, or pollutants originally generated under the hood is extremely tentative to
be dispersed to the environment and therefore are more easily attached to the wall
and inhaled by the users. One of the most intuitive way of avoid happening of this
situation is to install the canopy hood as low as possible towards the position of
the pollutants. In practical applications, however, the hood cannot be installed too
low because movements and operations of cook wares or apparatus by hands or tools
in the room between the table top and the canopy hood are commonly required. Because
that the draft currents generated by fans, air conditioning device, people walking
by, opening or closing doors or windows almost exist around the hood all the time,
the conventional hood therefore can hardly have satisfied performance.
[0005] Fig. 15 shows an improved rang hood wherein three cross-flow fans 21 are installed
on the front side, left side, and right side of the oven to provide three upward-issuing
slot jets. This design is aimed to use the three cross-flow fans 21 cooperated with
the back wall to reduce the negative effects of the draft currents generated in the
environment. However, because the area above the oven is enclosed by the three jets
generated by the three fans 21 and the back wall, the pollutants around the lower
portion of the enclosed area would present unsteady, chaotic flow motions with violent
three-dimensional tumbling and swirling vortices. The reason why this arrangement
would inevitably induce instability of flow is because of the unbalanced mass and
momentum conservation laws. The induced turbulent dispersion would therefore reduce
the efficiency of pollutant removal through the canopy hood installed at a distance
above the oven. Because the residence time of the grease particles and pollutants
staying around the area above the oven becomes much longer due to the vortical motion
of the flow, it becomes very dangerous when the draft currents pass over - the high-concentration
grease particles and pollutants accumulated in that area may be dispersed by the cross
flow. Besides, the chaotic motions of the vortical flow structures induced by the
three cross-flow fans may affect the flames of the burners, e.g., drift or extinguishment
of flames, and reduce the burning efficiency.
[0006] As mentioned above, the conventional kitchen hoods cannot effectively remove the
pollutants and this is because of the poor fluid dynamics of the air flow that the
conventional kitchen hoods generate.
SUMMARY OF THE INVENTION
[0007] The primary object of the present invention is to provide a gaseous, vapor, particulate,
or mixed type pollutant removing device which includes two elongate air blow devices
installed on the front and rear ends of the counter top and an elongate suction device
located at a distance above the counter top and between the two air blow devices so
as to form two air curtains such that the gaseous, vapor, or particulate type pollutants
generated between the two air curtains can be effectively sucked by the elongate suction
hood installed above the counter top. By this arrangement the compensation air is
naturally provided into the capture zone from two "open sides" of the dual-air curtain
so that the flow field would behave more like "two-dimensional" although in strict
sense it is not. The three-dimensional, unsteady tumble and swirl vortical flows would
not appear so that the pollutants generated between the two air curtains can be effectively
sucked by the elongate suction device located at a distance above the counter top
and the influences on the flames can be reduced.
[0008] In order to achieve the objects mentioned above, the present invention relates to
a pollutant removing device which comprises first and second air blow devices which
are respectively located at a front end and a rear end of a pollution source on a
counter top as well as a suction device is located above the counter top and includes
at least one elongate suction opening which is connected with a suction machine. The
first and second air blow devices respectively may also be elongate air blow slots
so as to blow air upward. The elongate suction opening(s) of the suction device located
above the counter top is parallel to the first and second elongate air blow slots.
The first and second elongate air blow slots issue upward two planar jets and drawn
by the at least one elongate suction opening of the suction device to form two air
curtains so that the pollutants between the air curtains would be less affected by
the draft currents existing in the environment. The at least one elongate suction
device draws the pollutants encapsulated between the two air curtains out to the outdoors
through the suction opening(s).
[0009] The present invention will become more obvious from the following description when
taken in connection with the accompanying drawings which show, for purposes of illustration
only, a preferred embodiment in accordance with the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010]
Figs. 1A-1C show the basic theory used in the pull-push air curtains of the present
invention;
Fig. 2 is a side view to show the pollutant removing device of the present invention;
Fig. 3 is a front view of the pollutant removing device of the present invention;
Fig. 4 is a perspective view to show the dual-air curtain range hood of the present
invention;
Figs. 5 and 6 show the flow field results tested by laser Doppler velocimeter (LDV)
while no top cabinet and back wall are existed;
Figs. 7 and 8 show the flow field results tested by laser Doppler velocimeter (LDV)
while the top cabinet and back wall are existed;
Fig. 9 shows the results of capture efficiencies by using a large upright board to
simulate drafts generated by fan, air conditioner, or walk-by of people for both of
the hood of the present invention and the conventional hood;
Fig. 10 shows the oil collection device used in the hood of the present invention;
Fig. 11 shows a cross sectional view of the connection of the oil collection device
and the hood of the present invention;
Fig. 12 shows a conventional range hood;
Fig. 13 shows the non-dimensional upward velocity on central axis under hood opening
when tested by laser Doppler velocimeter;
Fig. 14 shows the capture zone of a conventional hood subject to influence of cross
draft when tested by laser Doppler velocimeter, and
Fig. 15 shows the conventional range hood with left, right and front upward-blowing
jets.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0011] Figs. 1A-1C show the hand sketches of the simplified flow fields associated to a
planar jet, a suction slot, and a combination of the jet and the suction slot, respectively.
As shown in Fig. 1A, a jet 50 is ejected from a nozzle 51 from the left to the right.
During the evolution process the environmental air nearby the jet 50 would be entrained
inward through the jet boundary. The jet 50 therefore will expand outward in the downstream
area. The fashion of expansion will depend on the characteristic regimes of Reynolds
number. Downstream the nozzle 51 within a distance about 80 nozzle diameters, the
momentum conservation usually is observed. The jet may expand, break up and disperse
quickly after a distance about 100∼150 nozzle diameters downstream the nozzle 51.
During the evolution processes of the jet 50, continuous exchanges of momentum, mass,
and heat happen between the jet 50 and the nearby environmental air. As shown in Fig.
1B, a suction slot 53 draws air from the left to the right. The air flows around the
suction slot 53 are denoted by reference 52. The active suction area is located within
a downstream distance from the suction slot 53 to about only 1.5 times diameters of
the suction slot 53, as mentioned previously. Individual use of the jet usually lead
to early dispersion and individual use of the suction slot usually lead to poor suction
capability at the distance beyond the effective suction range. As shown in Fig. 1C,
when a jet 50 and a suction slot 53 are arranged face to face at a distance,
the flow field in-between the two physical devices varies with the suction strength
provided by the suction slot 53 and the Reynolds number of the jet issued from the
nozzle 51. If the factors mentioned above are properly adjusted, the poor suction
capability of the individual suction slot beyond the effective suction range and the
early dispersion characteristics of the individual jet can be improved by the interaction
between the jet and the suction which is called the push-pull effect. As this happens,
an air curtain which can resist the interference of side drafts to some levels can
be established.
[0012] As shown in Fig. 2 and 3, a preferable embodiment of the pollutant removing device
includes a first air blow device 6 and a second air blow device 6' respectively located
at a front end and a rear end of a pollutant generation source 65 which is installed
in a counter top 6". The first and second air blow devices 6, 6' respectively include
a first elongate air blow slot 63 and a second elongate air blow slot 64 so as to
blow air upward. The first and second elongate air blow slots 63, 64 are respectively
located in parallel to the front and rear ends of the pollutant generation source
65. A suction device 61 is located above the counter top 6" to which the pollutant
generation source 65 is installed and the suction device 61 includes at least one
elongate suction opening 60 which is connected with a suction machine which is not
shown. The at least one elongate suction opening 60 is arranged parallel to the first
and second elongate air blow slots 63, 64. The number of the elongate suction opening
60 can be two. In a preferable embodiment, there is one elongate suction opening 60
which is located above the first and second elongate air blow slots 63, 64.
[0013] A rectangular suction device 61 is located at a distance from the counter top 6"
and two flanges 62 extend from two sides of the elongate suction opening 60 of the
suction device 61. The upward-blowing jets issued from the first and second elongate
air blow slots 63, 64 located at the front and rear end of the counter top 6" associated
with the upward-drawing suction flow induced by the elongate suction opening 60 form
the two inclined air curtains 66, 67 as shown in Figs. 2 and 3. Because of the existence
of the counter top 6", no air can be fed from the underside. A recirculation bubble
therefore is formed above the counter top 6" between the two air curtains 66, 67.
The air flows inside and outside the recirculation bubble are exchanged by the turbulence
diffusion. The air flows above the recirculation bubble are drawn by the suction device
61 and released to outside of the room. The two sides above the counter top 6" are
left open or equipped with grids or porous boards through which the compensation air
can be naturally provided into the area between the two air curtains as shown in Fig.
3 so that the air flows are steady.
[0014] As shown in Fig. 4, a dual-air curtain range hood using the pollutant removing device
is disclosed and comprises a first air blow device 7, a second air blow device 7'
and a suction device 70, wherein the first and second air blow devices 7, 7' are respectively
located at a front end and a rear end of an oven 79 installed on a counter top 77.
The first and second air blow devices 7, 7' respectively include a first elongate
air blow slot 80 and a second elongate air blow slot 80', the first and second elongate
air blow slots 80, 80' are located in parallel to the front and rear ends of the oven
79 and blow air upward. The suction device 70 is located above the counter top 77
to which the oven 79 is installed and includes at least one elongate suction opening
81 which is connected with a suction machine 72. The at least one elongate suction
opening 81 is parallel to the first and second elongate air blow slots 80, 80'. The
number of the elongate suction opening 81 can be two, preferably, one elongate suction
opening 81 is located between the first and second elongate air blow slots 80, 80'.
[0015] The suction device 70 includes an elongate suction opening 81 which forms a suction
opening facing downward and two flanges 71 extend from two sides of the elongate suction
opening 81. The suction device 70 is located at a certain height from the counter
top 78 so as to provide an upward suction force. The elongate suction opening 81 is
connected with a suction machine 72 which is located in the cabinet 75 above the counter
top 78 so as to reduce noise. The pipe 721 is opened to outside of the room or is
connected to a filter/oil-separation device/oil-collection device and then brings
the pollutant out of the room. Two flanges 71 extend from the two sides of the elongate
suction opening 81 of the suction device 70. The first and second air blow devices
7, 7' are located at the front and rear ends of the oven 79. The first air blow device
7 and the second air blow device 7' are two cross flow fans which are co-operated
with the suction machine 72. The first and second air blow devices 7 and 7' can be
two elongate slots and cooperated with a blower (not shown) so as to form two upward-blowing
air jets.
[0016] The two upward-blowing air jets issued from the first and second air blow devices
7, 7' installed at the front and rear ends of the oven 79 combined with the upward
suction flow generated by the suction device 70 that has the elongate suction opening
81, a dual-air curtain flow structure which can prevent the pollutant from escaping
from the capture area is formed. The air curtain at the rear end of the oven 79 can
effectively prevent the grease particles from attaching on the wall on the rear end
of the counter top 78. Besides, the two sides above the counter top 77 are opened
so that air can be sucked into the area between the two air curtains to feed the suction
action. By this way, the flow field can maintain nearly "two-dimensional." The two
sides above the counter top 77 may have porous boards or grids to allow the air be
drawn into the area between the two air curtains with small flow resistance.
[0017] If a smoke is released on the counter top 77 and uses laser-assisted smoke flow visualization
technique to trace the flow of the smoke on the planes across the side view, the flow
patterns look just similar to that shown in Fig. 2. In addition, when measuring the
velocity of the area under the suction device 70 by using laser Doppler velocimeter
(LDV), the results are shown in Figs. 5 and 6 when no rear wall and the cabinet above
the suction device are installed. The status of the air flows in the area is almost
identical to the disclosures in Figs. 2 and 3. The results shown in Figs. 7 and 8
are for the case when there are rear wall and the cabinet installed above the suction
device 70. In the mediate portion of the area as shown in Fig. 7, there will be no
recirculation bubbles close to the oven as shown in Fig. 5, rather has a source point.
The velocity between the position below the source point and the position above the
counter top 78 is small so that it would almost hardly affect the flames. The air
curtain at the rear end is affected by the wall and performs an asymmetric pattern
when compared with that of the front air curtain. The flows close to the rear wall
generates corner vortexes due to the flow topology. Observations in the laboratory
show that the smokes or pollutants restricted between the two air curtains can be
effectively drawn away by the suction device 70 through the elongate suction opening
81.
[0018] Moreover, the tracer gas method is used to examine the capture efficiencies of the
present invention and the conventional range hood. The suction device is installed
at different distances from the counter top and a large upright board swings at 0.35
m/s to simulate air flows generated by fan, or air conditioner or by people walking
by the counter. Pure SF
6 gas is provided at constant flow rate by a gas releasing device placed on the counter
top. The velocity and concentration of the SF
6 are detected at a remote cross section of the suction pipe. The capture efficiency,
which is defined as the flow rate of SF
6 passes through the suction pipe divided by the flow rate of pure SF
6 released from the gas releasing device, can be calculated. The result is disclosed
in Fig. 9. Obviously, the dual-air curtain range hood has much higher capture efficiency
than that of the conventional range hood. The ability for reducing the interference
by the reference flows of the range hood of the present invention is much higher than
that of the conventional range hood.
[0019] Figures 10 and 11 show an oil collection device 9 which is removably connected to
the elongate suction opening 81 of the suction device 70 so as to collect the oil
flowing along insides of the elongate suction opening 81. The elongate suction opening
81 protrudes a little from the flanges 71 and faces downward. The oil collection device
9 is a rectangular box with an open top and includes a base board 91 from which a
first side panel 92, a first upright board 93, a second upright board 94 and a second
side panel 95 extend upward. A filter 96 is connected to the base board 91. A first
space 97 is defined between the first side panel 92, the first upright board 93 and
the base board 91, and a second space 98 is defined between the second side panel
95, the second upright board 94 and the base board 91. Two support plates 99 are located
above the filter 96 and connected between the first and second upright boards 93,
94.
[0020] When pushing the oil collection device 9 upward to engage with the elongate suction
opening 81, the first and second side panels 92, 95 are engaged with two outsides
of the elongate suction opening 81. When the gas containing pollutants are sucked
and passed through the filter 96, the oil mist may be condensed into grease particles
and attach on the insides of the elongate suction opening 81. The condensed grease
will flow along the insides of the suction device 70 by the effect of gravity and
drop into the first and second spaces 97, 98. The grease collected in the first and
second spaces 97, 98 can be cleaned by removing the oil collection device 9 from the
elongate suction opening 81.
[0021] While we have shown and described the embodiment in accordance with the present invention,
it should be clear to those skilled in the art that further embodiments may be made
without departing from the scope of the present invention as defined by the appended
claims.
1. A pollutant removing device comprising:
a first air blow device (6) and a second air blow device (6') respectively located
at an end of a pollutant generation source (65)and respectively including a first
elongate air blow slot (63) and a second elongate air blow slot (64) so as to blow
air upward, and
a suction device (61) located above a counter top to which the pollutant generation
source (65) is installed, the suction device (61) including at least one suction opening
(60) which is connected with a suction machine,
characterized
in that the first air blow device and the second air blow device are respectively located
at a front end and a rear end of the pollutant generation source (65), and in that
the at least one suction opening being an elongate suction opening arranged parallel
to the first and second elongate air blow slots (63,64), wherein the at least one
elongate suction opening is located between the first and second elongate air blow
slots,
thereby defining two air curtains being formed between the at least one elongate suction
opening and the first and second elongate air blow slots.
2. A range hood using a pollutant removing device comprising:
a first air blow device (7) and a second air blow device (7') respectively located
at an end of an oven (79) and respectively including a first elongate air blow slot
(80) and a second elongate air blow slot (80'), the first and second elongate air
blow slots located in a counter top so as to blow air upward, and
a suction device (70) located above the counter top to which the burner is installed,
the suction device (70) including at least one suction opening (81) which is connected
with a suction machine,
characterized
in that the first air blow device (7) and the second air blow device (7') are respectively
located at a front end and a rear end of the oven (79), and
in that the at least one suction opening (81) being an elongate suction opening arranged
parallel to the first and second elongate air blow slots (80,80'), wherein the at
least one elongate suction opening (81) is located between the first and second elongate
air blow slots (80,80')
thereby defining two air curtains being formed between the at least one elongate suction
opening and the first and second elongate air blow slots.
3. The device as claimed in claim 2, wherein the first air blow device and the second
air blow device are two cross flow fans which are co-operated with the suction machine.
4. The device as claimed in claim 2 further comprising a blower communicates with the
first and second elongate air blow slots and co-operated with the suction machine.
5. The device as claimed in claim 2 further comprising an oil collection device which
is removably connected to the at least one elongate suction opening of the suction
device.
6. The device as claimed in claim 5, wherein the oil collection device is a rectangular
box with an open top and includes a base board from which a first side panel, a first
upright board, a second upright board and a second side panel extend upward, a filter
is connected to the base board, a first space is defined between the first side panel,
the first upright board and the base board, a second space is defined between the
second side panel, the second upright board and the base board, the first and second
side panels are engaged with two outsides of the at least one elongate suction opening
and adapted to collect oil flowing along insides of the at least one elongate suction
opening in the first and second spaces.
1. Schadstoffentfernungseinrichtung mit den folgenden Bestandteilen:
einer ersten Luftblaseinrichtung (6) und einer zweiten Luftblaseinrichtung (6'), die
jeweils an einem Ende einer Schadstoff erzeugenden Quelle (65) angeordnet sind und
jeweils einen ersten langgestreckten Luftblasschlitz (63) und einen zweiten langgestreckten
Luftblasschlitz (64) umfassen, um die Luft nach oben zu blasen, und
eine Absaugeinrichtung (61), die oberhalb einer Arbeitsfläche angeordnet ist, auf
der die Schadstoff erzeugende Quelle (65) angeordnet ist, wobei die Absaugeinrichtung
(61) wenigstens eine Absaugöffnung (60) umfasst, die mit einer Absauganlage verbunden
ist,
dadurch gekennzeichnet, dass
die erste Luftblaseinrichtung an einem vorderen und die zweite Luftblaseinrichtung
an einem hinteren Ende der Schadstoff erzeugenden Quelle (65) angeordnet sind und
dass die wenigstens eine Absaugöffnung eine langgestreckte Absaugöffnung ist, die
parallel zu den ersten und zweiten langgestreckten Luftblasschlitzen (63, 64) angeordnet
ist, wobei die wenigstens eine langgestreckte Absaugöffnung zwischen dem ersten und
dem zweiten langgestreckten Luftblasschlitz angeordnet ist,
wodurch sie zwei Luftschleier definiert, die zwischen der wenigsten einen langgestreckten
Absaugöffnung und dem ersten und dem zweiten langgestreckten Luftblasschlitz gebildet
werden.
2. Dunstabzugshaube, die eine Schadstoffentfernungseinrichtung mit den folgenden Bestandteilen
verwendet:
eine erste Luftblaseinrichtung (7) und eine zweite Luftblaseinrichtung (7'), die jeweils
an einem Ende eines Herdes (79) angeordnet sind und jeweils einen ersten langgestreckten
Luftblasschlitz (80) und einen zweiten Luftblasschlitz (80') umfassen, wobei der erste
und der zweite langgestreckte Luftblasschlitz auf einer Arbeitsfläche angeordnet sind,
um Luft nach oben zu blasen, und
eine oberhalb der Arbeitsfläche angeordnete Absaugeinrichtung (70), auf der der Brenner
angeordnet ist, wobei die Absaugeinrichtung wenigstens eine mit einer Absauganlage
verbundene Absaugöffnung (81) aufweist,
dadurch gekennzeichnet, dass
die erste Luftblaseinrichtung (7) an einem vorderen und die zweite Luftblaseinrichtung
(7') an einem hinteren Ende des Herdes (79) angeordnet sind, und dass die wenigstens
eine Absaugöffnung (81) eine langgestreckte Absaugöffnung ist, die parallel zu dem
ersten und zweiten langgestreckten Luftblasschlitz (80, 80') angeordnet ist,
wobei die wenigstens eine langgestreckte Absaugöffnung (81) zwischen dem ersten und
zweiten langgestreckten Luftblasschlitz (80, 80') angeordnet ist,
wodurch zwei Luftschleier definiert werden, die zwischen der wenigstens ersten langgestreckten
Absaugöffnung und dem ersten und zweiten Entlüftungsschlitz gebildet werden.
3. Einrichtung nach Anspruch 2, bei der die erste Luftblaseinrichtung und die zweite
Luftblaseinrichtung zwei Querstromventilatoren sind, die mit der Absauganlage zusammenwirken.
4. Einrichtung nach Anspruch 2, die weiterhin ein Gebläse umfasst, das mit dem ersten
und dem zweiten langgestreckten Entlüftungsschlitz in Verbindung steht und mit der
Absauganlage zusammenwirkt.
5. Einrichtung nach Anspruch 2, die weiterhin eine Ölauffangeinrichtung aufweist, die
entfernbar mit der wenigstens einen langgestreckten Absaugöffnung der Absaugeinrichtung
verbunden ist.
6. Einrichtung nach Anspruch 5, bei der die Ölauffangeinrichtung eine rechteckige Box
mit offener Oberseite ist und ein Bodenplatte umfasst, von der eine erste Seitenwand,
eine erste aufrecht stehende Platte, eine zweite aufrecht stehende Platte und eine
zweite Seitenwand nach oben ragen, wobei ein Filter mit der Bodenplatte verbunden
ist, ein erster Raum zwischen der ersten Seitenwand, der ersten aufrechten Platte
und der Bodenplatte definiert ist, ein zweiter Raum zwischen der zweiten Seitenwand,
der zweiten aufrechten Platte und der Bodenplatte definiert ist, wobei die erste und
zweite Seitenwand mit zwei Außenseiten der wenigstens einen langgestreckten Absaugöffnung
zusammenwirken und so ausgebildet sind, dass sie in dem ersten und zweiten Raum Öl
auffangen, das innerhalb der wenigstens einen langgestreckten Absaugöffnung fließt.
1. Dispositif de suppression de polluant comprenant :
un premier dispositif à jet d'air (6) et un second dispositif à jet d'air (6') respectivement
situés au niveau d'une extrémité d'une source de production de polluant (65) et incluant
respectivement une première fente allongée à jet d'air (63) et une seconde fente allongée
à jet d'air (64) de façon à souffler de l'air vers le haut, et
un dispositif d'aspiration (61) situé au-dessus d'un plan de travail sur lequel la
source de production de polluant (65) est installée, le dispositif d'aspiration (61)
incluant au moins une ouverture d'aspiration (60) qui est reliée à une machine d'aspiration,
caractérisé
en ce que le premier dispositif à jet d'air et le second dispositif à jet d'air sont respectivement
situés au niveau d'une extrémité avant et d'une extrémité arrière de la source de
production de polluant (65) et en ce que l'au moins une ouverture d'aspiration est
une ouverture d'aspiration allongée agencée parallèlement aux première et seconde
fentes allongées à jet d'air (63, 64), dans lequel l'au moins une ouverture d'aspiration
allongée est située entre les première et seconde fentes allongées à jet d'air,
définissant ainsi deux rideaux d'air formés entre l'au moins une ouverture d'aspiration
allongée et les première et seconde fentes allongées à jet d'air.
2. Hotte utilisant un dispositif de suppression de polluant comprenant :
un premier dispositif à jet d'air (7) et un second dispositif à jet d'air (7') respectivement
situés au niveau d'une extrémité d'un four (79) et incluant respectivement une première
fente allongée à jet d'air (80) et une seconde fente allongée à jet d'air (80'), les
première et seconde fentes allongées à jet d'air étant situées dans un plan de travail
de façon à souffler de l'air vers le haut, et
un dispositif d'aspiration (70) situé au-dessus du plan de travail sur lequel le brûleur
est installé, le dispositif d'aspiration (70) incluant au moins une ouverture d'aspiration
(81) qui est reliée à une machine d'aspiration,
caractérisé
en ce que le premier dispositif à jet d'air (7) et le second dispositif à jet d'air (7') sont
respectivement situés au niveau d'une extrémité avant et d'une extrémité arrière du
four (79), et
en ce que l'au moins une ouverture d'aspiration (81) est une ouverture d'aspiration allongée
agencée parallèlement aux première et seconde fentes allongées à jet d'air (80, 80'),
dans lequel l'au moins une ouverture d'aspiration allongée (81) est située entre les
première et seconde fentes allongées à jet d'air (80, 80')
définissant ainsi deux rideaux d'air formés entre l'au moins une ouverture d'aspiration
allongée et les première et seconde fentes allongées à jet d'air.
3. Dispositif selon la revendication 2, dans lequel le premier dispositif à jet d'air
et le second dispositif à jet d'air sont deux ventilateurs tangentiels qui sont conjointement
mis en oeuvre avec la machine d'aspiration.
4. Dispositif selon la revendication 2, comprenant en outre une soufflerie qui communique
avec les première et seconde fentes allongées à jet d'air et qui est conjointement
mise en oeuvre avec la machine d'aspiration.
5. Dispositif selon la revendication 2, comprenant en outre un dispositif de collecte
d'huile qui est relié de façon amovible à l'au moins une ouverture d'aspiration allongée
du dispositif d'aspiration.
6. Dispositif selon la revendication 5, dans lequel le dispositif de collecte d'huile
est une boite rectangulaire avec un sommet ouvert et qui inclut une planche de base
à partir de laquelle un premier panneau latéral, une première planche verticale, une
seconde planche verticale et un second panneau latéral s'étendent vers le haut, un
filtre est relié à la planche de base, un premier espace est défini entre le premier
panneau latéral, la première planche verticale et la planche de base, un second espace
est défini entre le second panneau latéral, la seconde planche verticale et la planche
de base, les premier et second panneaux latéraux sont en prise avec deux côtés extérieurs
de l'au moins une ouverture d'aspiration allongée et sont conçus pour recueillir l'huile
s'écoulant le long des côtés intérieurs de l'au moins une ouverture d'aspiration allongée
dans les premier et second espaces.