JP2004077073A - Range hood fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a range hood fan capable of enhancing the capturing efficiency of an upward air flow even if a heating cooking unit is an electromagnetic induction heating type cooking heater by effectively utilizing an exhaust flow from an exhaust device as an air blasting device as a control flow injected toward a swirl produced in order to enhance the capturing efficiency of the upward air flow. <P>SOLUTION: The range hood fan is provided with a hood body 1; a swirl production body 5 provided above the heating cooking unit, downwardly guiding the upward air flow B and producing the swirl Q by Coanda effect in the hood body 1; an exhaust device 6 provided on the back side of a filter 3 of the hood body 1 or the outside of the hood body 1 and sucking and exhausting the swirl Q produced in the swirl production body 5; and a control flow injection part 7 provided below the swirl production body 5 and injecting it toward the produced swirl Q to strengthen the power of the swirl Q. The exhaust flow is used as the control flow F having the exhaust device 6 as an air blasting source. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a range hood fan suitable for a gas stove, an electric stove, and an electromagnetic induction heating type cooking heater (IH heater).
[0002]
[Technical background]
Conventionally, there are various types of range hood fans called a flat type, a boot type, and the like. In general, an exhaust device is provided behind the filter, and an ascending airflow collecting space is provided between the front of the filter and the hood body. And a filter for removing oils and fats contained in the updraft by the filter and exhausting the air outdoors by the exhaust device while preventing the updraft from leaking into the room in the collection space.
In addition, a top plate of the hood body, a face plate called a rectifying plate is arranged in front of the filter with a gap between the left and right side plates, and the rising airflow guided by the rectifying plate from the gap is increased by increasing the wind speed. There is also a range hood fan of a type configured to suction with an exhaust device to prevent leakage of upward airflow outside the hood body.
By the way, gas stoves and electric stoves using city gas, LP gas or the like as fuel are generally spread as cooking appliances, but today, there is a need for electromagnetic induction heating type cooking heaters (IH heaters). There is an urgent need to provide a range hood fan for the electromagnetic induction heating type cooking heater.
[0003]
In addition, the gas stove generates a relatively strong updraft of combustion gas containing harmful substances such as carbon dioxide and possibly carbon monoxide together with steam from a cooking pot or the like.
Although the electric stove is not as strong as a gas stove, it generates an updraft during cooking.
On the other hand, the electromagnetic induction heating type cooking heater only generates a weak ascending airflow (cooking odor including steam) during cooking.
[0004]
Therefore, in particular, in the electromagnetic induction heating type cooking heater, even if a conventional range hood fan is used, the rising airflow is weak, and thus it is insufficient to effectively collect and exhaust the rising airflow generated during cooking. In addition to the problem that the rising air current (cooking smell including steam) is not collected and diffuses in all directions and contaminates the ceiling of the kitchen, etc., and because the rising air temperature is low, steam is There is a problem in that it adheres to the internal components and contaminates the cooking container and the cooking being cooked.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned conventional circumstances, and a purpose thereof is to provide a range hood fan capable of improving the efficiency of collecting an updraft even if the cooking device is an electromagnetic induction heating type cooking heater. Is to be newly provided.
Another object is to provide a range hood fan that makes effective use of an exhaust flow from an exhaust device as a control flow that is ejected toward a vortex generated to further improve the efficiency of collecting the upward air flow. It is to provide.
[0006]
[Means for Solving the Problems]
The technical measures taken to solve the above object are a hood body, a vortex generator which is provided above the cooking device in the hood and guides upward airflow downward to generate a vortex by the Coanda effect, An exhaust device that is provided behind the filter of the body or outside the hood and sucks and exhausts the vortex generated by the vortex generator; and an exhaust device that is provided below the vortex generator and squirts toward the generated vortex to generate the vortex. A ranged fan, comprising: a control flow jetting portion for increasing the power of the vortex, wherein the exhaust device is used as a blower and the exhaust flow is used as the control flow (claim 1).
As a specific configuration, the eddy current generator is constituted by a rectifying plate provided with a gap secured between the left and right side plates of the hood body and the top plate above the cooking utensil, Is formed in a shape having a downward guide surface formed including a portion where the upward air current collides, and a curl-shaped surface which is formed to be curved in an arc toward the front continuously from the guide surface (claim) Item 4), More specifically, a lower portion of the front opening portion of the hood body having a substantially right-angled triangular shape in side view is closed with a cover, and a rectifying plate is provided above the hood body with a gap between at least the left and right side plates of the hood body. And a filter is installed behind the rectifying plate, and an exhaust device is provided behind the filter or outside the hood, and the rectifying plate is provided with a downward guide surface including a portion where the updraft impinges. And continuously on the guide surface Control in which the control flow is provided in the cover in the tangential direction of the generated vortex, and the control flow for increasing the vortex force is directed obliquely upward from below. An example is a configuration in which a flow jetting unit is provided, and an exhaust flow using the exhaust device as a blowing source is jetted from the control flow jetting unit as a control flow, and the control flow is supplied through a deodorizing unit. Claim 5).
The cooking utensils include gas stoves, electric stoves, electromagnetic induction heating type cooking heaters (IH heaters), and the like.
[0007]
According to the above means, the upward airflow hitting the vortex generator is guided downward to generate a vortex by the Coanda effect. The Coanda effect is a fluid phenomenon that creates a negative pressure effect when a rising airflow flowing along a wall surface is guided along the wall surface, thereby generating a vortex.
In a more specific aspect, the upward airflow guided by the guide surface that guides downward is formed into an arc shape by a curl surface that is formed in an arc shape continuously curved forward toward the front of the guide surface. A vortex is generated by the negative pressure effect at the time of guiding the vortex, and the vortex is sucked and exhausted by an exhaust device.
Then, a control flow is jetted from the lower control flow jetting portion toward the generated eddy current to stably generate the eddy current of the required power, thereby improving the collection efficiency of the upward airflow.
Therefore, even if an electromagnetic induction heating type cooking heater (IH heater) is used as a heating cooker, the weak ascending air current is quickly drawn without being diffused outside the hood body, collected and exhausted, thereby improving collection efficiency. Can be done.
The control flow utilizes an exhaust flow using the exhaust device as a blow source. This makes it possible to obviate the need for an air supply source for supplying the control flow.
[0008]
In order to effectively use the exhaust stream as the control stream, it is preferable that the control stream is supplied to the control stream jetting section via the deodorizing means (claims 2 and 5). As the deodorizing means, an appropriate means for effectively adsorbing and removing or decomposing and removing components of gases generated from each of the gas stove, the electric stove, and the electromagnetic induction heating type cooking heater, which are heating cooking appliances, is used. The deodorizing means is freely replaceable with a new one or detachable for cleaning.
[0009]
Further, it is preferable that the wind speed of the control flow is controlled to a predetermined value irrespective of the exhaust amount of an exhaust device (claims 3 and 6). As described above, in order to guide the ascending airflow downward and stably obtain the vortex generated by the Coanda effect, it is preferable to assist by a control flow at a predetermined wind speed. When the exhaust amount of the exhaust device is reduced, the blowing speed of the control flow is naturally reduced, so that the supply amount of the control flow necessary for stably generating the vortex cannot be provided. Conversely, when the exhaust amount of the exhaust device increases, the blowing speed of the control flow increases, preventing the rise of the rising airflow and dispersing it toward the hood body, thereby hindering the stable generation of the vortex. Therefore, regardless of the displacement of the exhaust device (switching between "strong", "medium" and "weak"), the control flow at a predetermined wind speed required to stably generate the vortex is not blown off regardless of the rising airflow. It is always supplied during operation.
The wind speed of the control flow is preferably 2-3 m / sec. If it is less than 2 m / sec, it is weak to stably generate the vortex generated by the Coanda effect, and if it is more than 3 m / sec, a turbulent flow that inhibits stable generation of the vortex will be created.
[0010]
The control flow is provided with an ejection portion for ejecting a control flow for enhancing vortex force in a tangential direction of the generated vortex generated from below in a tangential direction of the generated vortex. Therefore, it is very effective in stably generating the vortex of the required power and improving the efficiency of collecting the updraft (claim 7).
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the range hood fan of the present invention will be described. FIGS. 1 to 3 show an embodiment of a range hood fan in which an electromagnetic induction heating type cooking heater (IH heater) is used as a cooking appliance.
[0012]
As shown in FIG. 2 and the like, the range hood fan A includes a hood 1, a support plate 2 for a filter 3, a dew condensation water guide plate 4 laterally provided at a lower level of the support plate 2, and a vortex provided in front of the filter 3. The configuration includes a generator 5, an exhaust device 6 installed in a space behind the filter 3, a control flow jetting unit 7 disposed below the vortex generator 5, and enhancing a generated vortex force.
[0013]
As shown in FIGS. 1 to 3 and the like, the hood body 1 is formed in a substantially right-angled triangular shape including a top plate 11, left and right side plates 21, 21, and a back plate 31, and has a sloped front opening. .
[0014]
The vortex generator 5 is a face plate referred to as a rectifying plate (hereinafter, described with reference numeral 5) in the present embodiment, and has a front opening portion of the hood body 1 as shown in FIGS. The lower part is disposed in the upper part left by closing the lower part with the removable curved cover 8.
[0015]
As shown in FIG. 2, the rectifying plate 5 is disposed in the hood body 1 in a housed state, and extends over the entire width including a portion where a cooking smell (updraft) including steam just collides. The guide surface 15 includes a downwardly directed guide surface 15 and a curl-shaped surface 25 that is formed below the guide surface 15 and that is curved in an arc shape over the entire width continuously from the guide surface 15 toward the front.
Specifically, the curled surface 25 is formed in an arc shape in which the lowermost end is located forward of a middle portion closest to the back plate 31 side.
[0016]
As shown in FIG. 2, the rectifying plate 5 has an upper half (one half) side and a lower half (other half) on a support plate 2 provided at a position deeper in the hood body 1. ) Side is detachably supported on the dew condensation water guide plate 4 by appropriate means.
[0017]
As shown in FIG. 2, the dew condensation water guide plate 4 has a flat V-shape with the middle part in the depth direction as the lowermost end, and the left and right ends are supported by the left and right side plates 21, 21 of the hood body. 6, the rear end of which is connected to a lower end open edge of a control flow path 9 described later, and a dropping hole 14 of dew condensation water is formed at a pointed portion which is the lowest end portion. (See FIG. 2).
[0018]
As shown in FIG. 2, the support plate 2 has a concave and concave shape, and has a mounting surface 11 a for an operation unit formed by bending downward on a front edge of a top plate 11 of the hood body 1, and a dew condensation water guide plate 4. The filter 3 is provided over the front half part slightly behind the rectifying plate 5 in the above, and the filter 3 is detachably provided on a bottom portion behind the rectifying plate 5.
The left and right edges of the support plate 2 are in contact with the left and right side plates 21, 21 of the hood 1.
[0019]
As shown in FIGS. 2 and 3, the current plate 5 is suctioned between the upper edge and the upper piece 12 of the support plate 2 and between the left and right edges and the left and right side plates 21 of the hood body 1. The filter 3 is accommodated in front of the filter 3 so as to form a gap S for use, and is supported on the support plate 2 via a mounting means so as to be detachable.
[0020]
As shown in FIG. 2, the exhaust device 6 composed of a sirocco fan is accommodated in a back space defined by the support plate 2 and the dew condensation water guide plate 4.
[0021]
Further, the curved cover 8 is provided with the control flow jetting portion 7 over the entire length in the length direction with the lighting 10 arranged in the center interposed therebetween. As shown in FIGS. 2 and 3, a disposal liquid container 10a for receiving the disposal liquid falling from the drop hole 14 is provided directly above the illumination 10 so as to be removable.
[0022]
As shown in FIG. 3, the control flow jetting section 7 is provided with an interval in the width direction of the hood body 1 so as to jet an air flow obliquely upward on the upper side of the curved cover 8 along the cover 8. In the form of a slit. In the present embodiment, after the upper side of the cover 8 is opened in a slit shape at intervals, the curved cover 8 on the upper edge side of the opening is deformed in an inclined shape toward the inside of the back space. A control flow is jetted along the cover in a tangential direction of a vortex described later.
The control flow jetting portion 7 which is opened in a slit shape at the interval is inclined upward in front view so as to intersect when the lighting 10 side portion (specifically, the left and right half portions) is extended upward. The rectifying plate 5 is also opened, and the rising airflow rising in front of the lighting 10 can be satisfactorily guided to the central portion of the rectifying plate 5 so that a vortex is generated uniformly over the entire length of the rectifying plate 5 in the width direction. It is good (see FIG. 3).
[0023]
Further, in the present invention, the exhaust device 6 is used as a blowing source, and the exhaust flow thereof is used as the control flow. In detail, the exhaust device 6, the branch box 16 communicating with the exhaust device 6, The control channel 9 is configured.
[0024]
The control flow path 9 has a back plate 31 of the hood body 1 as a constituent member, and communicates the lower end opening of an air chamber 19 that opens both the upper and lower ends to the lower space of the dew condensation water guide plate 4, The latter half of the drive source 16 of the exhaust device 6 is arranged in the air chamber 19.
The upper end opening of the control flow path 9 is opened by the top plate 11 of the hood body 1 and communicates with the flow dividing box 16.
[0025]
The diversion box 16 is a hollow internal box body installed on the top plate 11 of the hood body 1, communicates with an exhaust port of an exhaust device (sirocco fan) 6, opens an inlet, and has a back wall portion. A partition 16c having a required height not extending from the portion near 16a to the upper wall 16b in parallel with the rear wall 16a is provided, and the control flow path is provided between the partition 16c and the rear wall 16a. 9 is formed, and an upside-down L-shaped upright portion 16d is erected at the same height as the partition portion 16c across the entrance from the partition portion 16c. The deodorizing means 100 between the partition 16a and the partition 16a is detachably accommodated, and a grill 16f is provided in a range facing the internal space of the horizontal portion of the vertical wall 16d in the curtain 16e serving as the front wall of the same branch box 16. Have been.
[0026]
Further, an electric shunt damper D is rotatably provided in the shunt box 16 in order to control the wind speed of the control flow blown to the control flow path 29 irrespective of the exhaust amount of the exhaust device 6. Have been.
[0027]
As shown in FIG. 2, the motor-driven shunt damper D has a motor d1 mounted on the upper side of the back wall 16a of the shunt box 16 and controls the rotation angle of the damper body d2 with the motor d1 to control the partition 16c. The opening amount of the exhaust device 6 is adjusted by varying the amount of approach to the upper end of the exhaust device 6 and linked to the drive source 16 and the changeover switch of the exhaust device 6 via the control unit. The damper body is configured such that the control flow is jetted from the control flow jetting portion 7 at a predetermined wind speed (described in an experimental example described later) regardless of the appropriately selected "strong", "medium", and "weak" displacements. In order to automatically adjust the branch opening at d2, it is automatically linked to the operation signals of the "strong", "medium" and "weak" changeover switches.
Of course, in the case of an exhaust system in which the number of revolutions is variable by a continuously variable transmission, the flow is divided by the damper body so that the control flow is jetted from the control flow jetting portion at a predetermined wind speed regardless of the exhaust amount. The opening is automatically adjusted via the control unit.
[0028]
In the present embodiment, in the space where the lighting 10 and the waste liquid container 10a are installed, partition walls 39, 39 partitioning both sides of the lighting 10 and the waste liquid container 10a so that the control flow is not supplied. Is extended to the upper end of the control channel 9 and the upper end opening is closed so that the control flow is supplied only to both sides of the illumination 10 and the waste liquid container 10a.
[0029]
In the present embodiment, the curvature of the curled surface 25 is 90 mm.
[0030]
The range hood fan A configured as described above collides the cooking smell (updraft including steam) B containing steam generated during cooking with the guide surface 15 of the flow straightening plate 5 to guide the cooking odor downward. A negative pressure action is generated when the further guiding is performed by the curled surface 25 curved in an arc shape forward toward the front of the guide surface 15, thereby generating a vortex Q (see FIGS. 1 to 3).
A tangential direction of the vortex Q from the control flow jetting section 7 to the vortex Q as a control flow F for generating a vortex force, using an exhaust flow using the driving source 16 of the exhaust device 6 as a blowing source without hindering the upward power of the upward air flow B. Vortex Q is ejected from the curved cover 8 obliquely upward from below toward below, so that the vortex Q of the required power that takes in the updraft B quickly can be generated more stably (see FIGS. 2 and 3). .
Then, even under the restriction that the control flow jetting portion 7 must be provided on both sides of the hood body 1 below the current plate 5 so as to avoid the illumination 10 provided in the width direction, even if the control flow jetting portion 7 is restricted. When the lighting 10 side portion (specifically, the left and right halves) is extended upward, the control flow F is provided so as to intersect and incline upward in front view (see FIG. 3). The vortex Q is ejected from below over the entire length in the width direction to uniformly generate the vortex Q over the entire length in the width direction of the rectifier plate 5, so that the efficiency of collecting and exhausting the rising airflow B can be improved.
Further, the exhaust stream P not used as the control stream is circulated indoors after passing through the deodorizing means 100 similarly to the control stream. (See FIG. 2).
Thereby, the ascending airflow B can be efficiently collected and exhausted without diffusing out of the hood body 1. In addition, when colliding with the guide surface 15, there is also an upward airflow B that is not guided downward, but the upward airflow B is generated between the upper piece 12 of the support plate 2 and the upper edge of the rectifying plate 5. It is sucked through the gap S.
[0031]
【Example】
A curl-shaped surface 25 having a diameter of 90 mm is continuously formed below the gentle inclined surface 15 formed so as to include the portion where the rising air current B just collides with the hood body 1 having a total width of 750 mm, a depth of 630 mm and a total height of 450 mm. It is curved in the shape of a forward arc, and the suction air velocity from the gap S between the upper piece 12 of the support plate 2 and the upper edge of the rectifying plate 5 is 2-3 m / sec. The suction wind speed from the gap S between the left and right edges of the plate 5 was set to 0.5 to 2 m / sec, and was adjusted to the predetermined wind speed of 2 to 3 m / sec from the control flow jetting section 7 irrespective of the displacement of the exhaust device 6. The control flow F was jetted from the control flow jetting section 7 at an inclination angle (elevation angle) of 38 degrees.
[0032]
According to this, the cooking odor (rising airflow) B including steam rising, which is visually observed, is not disturbed by the jetted control flow F, and is generated by the swirl flow Q generated over the entire width of the straightening plate F. The eddy current Q is collected without being leaked from the hood body 1 and leaked from the hood body 1, and the eddy current Q is passed through the left and right gaps S, S secured between the right and left side plates 21, 21 of the hood body 1 and the rectifying plate 5. The air was exhausted by the exhaust device 6 via the filter 3 in a shared manner. In the hood body 1 having the above-mentioned size, the control flow F jetted from the control flow jetting portion 7 at a wind speed of 2 m / sec generates a stable vortex Q to increase the exhaust efficiency of the rising airflow B. Was something.
[0033]
Needless to say, the range hood fan of the present invention can equally be used for cooking appliances such as gas stoves and electric stoves. Further, in the present embodiment, a configuration in which an exhaust flow not used as a control flow is circulated indoors is disclosed, but the present invention also includes a configuration in which an exhaust flow not used as a control flow is exhausted outdoors.
[0034]
【The invention's effect】
As described above, the present invention provides a hood body, a vortex generator provided above the cooking device in the hood to guide upward airflow downward to generate a vortex by the Coanda effect, and a filter behind the hood body or the hood. An exhaust device that is provided outside the body and suctions and exhausts a vortex generated by the vortex generator, and a control flow ejection unit that is provided below the vortex generator and increases the power of the generated vortex, Since the exhaust device is used as a blower and the exhaust flow is used as the control flow, a vortex is generated stably by increasing the power with the control flow, and an extremely weak rise is caused by the entrainment action of the vortex. Even air currents (cooking odors including steam) can be quickly drawn to collect and exhaust without diffusing out of the hood body, thereby ensuring high collection efficiency.
In addition, since the control flow uses the exhaust flow by using the driving source of the exhaust device as a blowing source, there is no need to install a dedicated blower for blowing the control flow, and the equipment cost can be significantly reduced.
In addition, since the generated eddy current accelerates the updraft and is exhausted, not only the eddy current generator, but also the contact time with the filter behind is shortened, and the steam characteristic of the electromagnetic induction heating type cooking heater is reduced. Is prevented as much as possible, and it is possible to prevent the cooking container and the dish being cooked from being stained by dripping during cooking.
[0035]
Further, since the gas contained in the control stream is removed by the deodorizing means, it does not become a factor that makes the interior of the kitchen uncomfortable.
[0036]
A vortex generator is formed above the cooking utensil with a rectifying plate provided with a gap between the left and right side plates of the hood body and the top plate, and the rectifying plate guides upward airflow downward. According to the fourth aspect of the present invention, a vortex is generated by the Coanda effect, and the vortex can be stably generated by effectively using the current plate, and the structure becomes complicated and costs are reduced. It will no longer soar.
[0037]
In addition, since the control flow is ejected from below in the tangential direction of the vortex generated as described in claim 7, the vortex can be generated more stably and the vortex force can be increased. The collection efficiency of the ascending airflow is further improved, and this is optimal when the electromagnetic induction heating type cooking heater that generates a weak ascending airflow is used as a heating cooker.
[0038]
Further, the lower part of the front opening portion of the hood body having a substantially right-angled triangular shape as viewed from the side is closed with a cover, and the upper portion is provided with a gap between at least the left and right side plates of the hood body. A rectifying plate is arranged and a filter is installed behind the rectifying plate, and an exhaust device is provided behind the filter or outside the hood body, and the rectifying plate is moved downward including a portion where the updraft impinges. It is formed in a shape having a guide surface and a curl-shaped surface that is curved and formed forward in an arc shape continuously from the guide surface, and is provided on the cover in a tangential direction of the generated vortex to be inclined from below. A control flow ejection section for ejecting a control flow for increasing the vortex force is provided upward, and an exhaust flow using the exhaust device as a blower is ejected from the control flow ejection section as a control flow, and the control flow is passed through a deodorizing means. Range foo to supply In the fan, a control flow for increasing the vortex force that does not hinder the rise of the updraft is ejected from a position away from the updraft and approaching the vortex, and a vortex of a stable power that entrains the updraft is always generated. In addition to greatly improving the collection efficiency, by jetting a clean exhaust stream as a control stream, there is no danger of dirtying the inside of the hood.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing a usage state of a range hood fan according to an embodiment, partially cut away.
FIG. 2 is an enlarged side view of the range hood fan, partially cut away.
FIG. 3 is a front view of a range hood fan showing a relationship among an updraft, a generated vortex, and a control flow.
[Explanation of symbols]
1: Hood body 5: Eddy current generator (rectifier plate)
6: Exhaust device 7: Control flow jetting part 100: Deodorizing means 21: Left and right side plates 11: Top plate 15: Guide surface 25: Curled surface 8: Cover (curved cover)
Q: Eddy current F: Control flow B: Updraft 3: Filter

Claims (9)

A hood body, a vortex generator that is provided above the cooking device in the hood and guides upward airflow downward to generate a vortex by the Coanda effect, and the vortex generator that is provided behind a filter of the hood body or outside the hood body. An exhaust device that sucks and exhausts the vortex generated in the exhaust device, and a control flow ejection unit that is provided below the vortex generator and ejects toward the generated vortex to enhance the power of the vortex, A ranged fan, wherein the exhaust device is used as a blower and an exhaust flow thereof is used as the control flow. The range hood fan according to claim 1, wherein the control flow is supplied to a control flow blowing unit via a deodorizing unit. 3. The range hood fan according to claim 2, wherein the wind speed of the control flow is controlled to a predetermined value regardless of an exhaust amount of an exhaust device. The vortex generator is constituted by a rectifying plate provided with a gap secured between the left and right side plates of the hood body and the top plate above the cooking utensil, and the rectifying plate defines a portion where the rising air current collides. A downwardly-facing guide surface formed so as to include a curl-shaped surface that is curved and formed forward in an arc shape continuously from the guide surface. The described range hood fan. A lower portion of the front opening portion of the hood body having a substantially right-angled triangular shape in side view is closed with a cover, and a rectifying plate is disposed above the hood body with a gap between at least the left and right side plates, and a rear side of the rectifying plate. A filter is provided, and an exhaust device is provided behind the filter or outside the hood body, and the straightening plate is connected to a downward guide surface including a portion where the upward air current collides, and the guide surface is continuously connected to the guide surface. It is formed in a shape having a curled surface curved in an arc shape toward the front, and a control flow for increasing the vortex force is provided on the cover in a tangential direction of the generated vortex flow and obliquely upward from below. A control flow jetting section to be provided, so that an exhaust stream with the exhaust device as a blowing source is jetted from the control flow jetting section as a control stream, and the control stream is supplied via a deodorizing means. Ranger Dofan. The range hood fan according to claim 5, wherein a wind speed of the control flow is controlled to a predetermined value regardless of an exhaust amount of an exhaust device. The range hood fan according to any one of claims 1 to 4, wherein the control flow is ejected from below in a tangential direction of the generated vortex flow. 7. The range hood fan according to claim 3, wherein a wind speed of the control flow is 2 to 3 m / sec. The ranged fan according to any one of claims 1 to 8, wherein the cooking device is an electromagnetic induction heating type cooking heater.

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