JPH0418215B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to a furnace that discharges smoke generated when meat, fish, etc. are grilled indoors so as not to pollute the indoor air. This invention relates to a smoke evacuation method and its device.

(Prior art) When grilling meat, fish, etc. at home, the heat source of a gas range is used as the upper side to suppress smoke generation as much as possible, and in the restaurant industry,
Smoke is removed by forced suction through a hood installed in the kitchen, but this is not sufficient.

In particular, yakiniku tastes best when eaten while the customer is grilling it themselves. Therefore, a horizontal air curtain suction type and a vertical air curtain suction type have been proposed, which use an air curtain to surround and exhaust smoke.

(Problems to be Solved by the Invention) However, in the horizontal air curtain suction type, the finished side of meat, fish, etc. that has been grilled after being grilled on one side is cooled with a stream of cold air, which impairs the taste. In addition, a vertical air curtain suction type was proposed in Special Publication No. 15695/1988, ``Yakimono Cooking Apparatus,'' but the vertical air curtain that extends from the area around the furnace to the hood is vulnerable to external disturbances.
They are damaged by the vibrations of the surrounding air, and the smoke is not necessarily exhausted sufficiently, and when a large number of such devices are used, the inside of the store becomes smoky.

(Means for Solving the Problems) The present invention provides a method and device for exhausting smoke from a stove, which allows customers to enjoy meat, fish, etc. while grilling it, and which does not easily pollute the interior of the room with smoke. The configuration is as follows.

The first invention is when cooking grilled food on a stove,
The air supplied to the furnace body is divided into combustion air and whirlpool air, and the whirlpool air is guided to a whirlpool generator installed on the outer periphery of the open end of the fire bed, and the smoke generated by combustion is passed through the whirlpool generator. This is a method of exhausting smoke from a furnace in which the smoke is surrounded by a rush of blown air and discharged from an exhaust duct provided above the furnace body.

In a second aspect of the present invention, an outer shell of a furnace main body having an air passage in which a blower fan is installed surrounds a fire bed provided with combustion air ventilation holes across an air passage, and an opening of the outer shell includes: an annular top plate; a short tube having an end surface fixed to the annular top plate; an annular bottom plate having an annular air inlet for swirling air between the inner peripheral surface and the outer peripheral edge of the short tube; A plurality of guide vanes are fixed in a space defined by the top plate, the short cylinder, and the annular bottom plate, and bias the air introduced from the air passage through the air inlet toward the center of the annular top plate. A vortex generator is provided,
This is a smoke exhaust system for a furnace, in which an exhaust duct with an exhaust fan is placed above the furnace body.

In a third aspect of the present invention, an outer shell of a furnace main body having an air passage in which a blower fan is installed surrounds a fire bed provided with combustion air ventilation holes across an air passage, and in an opening of the outer shell, an annular plate having a plurality of vortex air holes arranged around the circumference connected to the air passage; and an air outlet each disposed on each of the holes and having an opening oriented in a constant direction in the circumferential direction. , a vortex generator is provided above the furnace main body, and includes a short conical cylinder member that surrounds the outside of the air outlet and has a small diameter at the top for deflecting the air blown from the air outlet toward the center. This is a smoke exhaust system for a furnace equipped with an exhaust duct equipped with an exhaust fan.

(Function) When cooking roasted food on the stove, the air supplied to the stove body is divided into combustion air and whirlpool air. There is a general tendency for fats and oils to fall onto the heat source in the fire bed of the furnace to which combustion air is supplied and burn, producing smoke and polluting the room. Thus, the smoke generated from the fire bed is surrounded by swirling air and exhausted from an exhaust duct provided above the furnace body. That is, swirl air is guided to a swirl generator provided on the outer periphery of the open end of the fire bed, and smoke generated by combustion is surrounded by the swirl of air blown out from the swirl generator. Since the swirling air is difficult to be disturbed by external disturbances, the smoke becomes an upward current and is efficiently exhausted from the exhaust duct.

According to the device according to the second aspect of the invention, meat, fish, etc. are placed on the fire bed via a grill, etc., and the blower fan is driven to blow air into the air passage between the fire bed and the outer shell of the furnace body. When air is fed into the firebox, part of it is sent through the vents into the firebox as combustion air, and the heat source inside the firebox grills meat, fish, etc., producing smoke.

On the other hand, the swirl air consisting of the remaining air fed into the air passage reaches the air inlet of the annular bottom plate of the swirl generator provided at the opening of the outer shell, and enters the swirl generator from the air inlet. , is biased toward the center of the annular top plate by a plurality of guide vanes, becomes a vortex, and blows out from between the annular top plate and the annular bottom plate.

The air that blows out in the form of a vortex surrounds the smoke generated on the fire bed, and due to the rising air current generated from the fire bed and the blowing force of the exhaust fan installed in the exhaust duct, the air blows out in the form of a vortex. It is discharged outside.

The device according to the third invention differs from the second invention in the configuration of the vortex generator. The swirling air sent to the air passage by the blowing fan passes through each hole in the annular plate and is blown out from the air outlet whose opening is oriented in a constant circumferential direction, forming a swirling stream. It is deflected toward the center by the inner wall of the cylindrical member, surrounds the smoke generated on the fire bed, and becomes an upward vortex due to the rising airflow generated from the fire bed and the suction force of the exhaust fan installed in the exhaust duct, and the smoke is exhausted. The smoke is discharged from the duct to the outside.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

A first embodiment of the apparatus used in the method for exhausting smoke from a furnace according to the present invention will be described with reference to FIGS. 1 to 3.

In FIG. 1, 1 indicates the furnace body. Fire bed 2
The jar is made of a fireproof and insulating material, and is provided with one or more ventilation holes 2a for intake of air for combustion. 4
is an outer shell constituting the furnace body 1, which surrounds the grate 2 with an air passage 3 in between, and is provided with an annular portion 4a projecting upward from the open end of the grate 2, and has a lower end provided with a blower fan 5; The air passage 6 in the section communicates with the air passage 3. 7 is a fixture for the outer shell 4 of the fire bed 2, and an appropriate number of fixtures are provided so as not to obstruct air circulation. 8 is a grill placed on the open end of the fire bed 2.

10 is a vortex generator, and the left half of FIGS. 2 and 3 shows the external appearance, and the right half shows the internal structure. 11 is
It is an annular top plate having an opening that is approximately the same size as the opening of the fire bed 2, and one end of a short tube 12 is fixed, leaving the outer periphery of the top plate 11, facing the top plate 11, and the short tube 12 is fixed. An annular bottom plate 1 in which an annular air inlet 13a for swirling air is formed between the inner peripheral surface and the outer peripheral edge of the cylinder 12.
4 is arranged and fixed to the inner peripheral surface of the top plate 11, the short tube 12, and the annular bottom plate 14, and biases the air flow from the air inlet 13a toward the center of the top plate 11 to create a vortex-like flow. A plurality of guide vanes 15 are provided to air the air outlet 1.
3b is formed.

Such an annular top plate 11, a short cylinder 12 whose end face is fixed to the annular top plate 11, and an annular air inlet 1 for swirling air between the inner peripheral surface and outer peripheral edge of the short cylinder 12.
The annular top plate 14 is fixed in a space defined by the annular top plate 11, the short tube 12, and the annular bottom plate 14, and the annular top plate A vortex generator 10 provided at the opening of the outer shell 4 is constituted by a plurality of guide vanes 15 that are biased toward the center of the guide vanes 11 . Here, the angle .alpha. between the arrow indicating the outflow direction of the air blown from the guide vanes 15 shown in FIG. 2 and the normal to the annular bottom plate 14 is preferably in the range of 20.degree. to 80.degree.

In the above-mentioned embodiment, the inner peripheral edge of the annular bottom plate 14 is bent upward to provide a weir facing the short tube 12 to form the guide plate 16 for guiding the eddy air flow upward. Here, the maximum value of the upward angle β of the airflow shown in FIG. 3 is preferably about 45 degrees. For this purpose, the guide plate 16 may be appropriately inclined with respect to the annular bottom plate 14.

The vortex generator 10 as described above has its short tube 12
is fitted into the annular part 4a which is the opening of the outer shell 4 of the furnace main body 1, the lower peripheral surface of the annular top plate 11 is engaged with the end face of the annular part 4a, and the inner peripheral edge of the annular bottom plate 14 is fitted. is secured to the outer periphery of the opening of the fire bed 2.

21 is a hood installed above with its core aligned with the furnace body 1, 22 is an exhaust fan that rotates in the same direction as the vortex generated by the vortex generator 10, and 23 is a
This is an exhaust duct that guides smoke outdoors. In a general home or the like, the outer end of the duct 23 can be installed just in front of an existing exhaust system. The hood 21 is positioned with respect to the furnace main body 1 by being suspended from the ceiling using a hanging tool (not shown) or by providing a support (not shown) between the hood 21 and the annular top plate 11.

Next, the operation of the first embodiment will be explained.

If a heat source such as charcoal is provided in the fire bed 2, the blower fan 5 is driven, combustion air is supplied into the fire bed 2 through the ventilation hole 2a, and meat, fish, etc. is grilled on the grill 8. Smoke is generated. The combustion air supplied into the fire bed 2 is a portion of the air sent into the air passage 3 by the blower fan 5 .

Most of the air sent by the blower fan 5 flows into the annular air inlet 13a of the vortex generator 10 as swirl air, is guided by each guide vane 15, and is biased toward the center of the annular top plate 11. The air outlet 13b
It blows out as a turbulent flow, and is assisted by the rising airflow from the fire bed 2 and the suction force of the exhaust fan 22 provided in the exhaust duct 23, and becomes an upward turbulent flow.

The smoke generated in the furnace main body 1 is wrapped in the upward vortex and exhausted from the exhaust duct 23 to the outside.
At this time, if the guide plate 16 is provided, the rise of the vortex will be promoted.

A second embodiment will be explained based on FIGS. 4 and 5.

The same reference numerals as in the first embodiment indicate the same parts. That is, 1 is the furnace body, 2 is the fire bed, 2a is the ventilation hole, 3
is an air passage. 4' is an outer shell, and 4'a is an annular portion projecting upward from the open end of the grate 2 of the outer shell 4'. 5 is a blower fan, 6 is an air duct, 7 is a fixture, and 8 is a grill, which are substantially the same as in the first embodiment.

10' is a vortex generator, which includes an annular plate 17;
Single roof-shaped air outlet 18 and conical short cylindrical member 1
It consists of 9. The annular plate 17 has a plurality of (six in this embodiment) swirling air holes 17a.
are provided on almost the same circumference. Air outlet 18
is provided above each through hole 17a, and its opening 18a
are provided in a fixed direction on the circumference, and in this embodiment are oriented clockwise, but may be oriented counterclockwise. The air passage area of the air outlet 18 is expanded toward the opening 18a so that the air flow is directed upward.

In such a vortex generator 10', the lower surface of the inner peripheral edge of the annular plate 17 is placed on the outer peripheral edge of the opening end of the fire bed 2, and the outer peripheral surface of the annular plate 17 is placed on the opening of the outer shell 4' of the furnace body 1. It is provided so as to fit into the annular part 4'a, which is the annular part 4'a, so as to cover the space between the outer periphery of the open end of the fire bed 2 and the outer shell 4'.
is connected to the air passage 3.

The conical short cylindrical member 19 has a small diameter at the top, surrounds the outside of the air outlet 18, and has the function of deflecting the air flow blown out from the outlet 18 toward the center. In this embodiment, a flange portion 19a facing outward is provided at the upper end portion of the conical short cylindrical member 19, and the flange portion 19a is placed on the upper end surface of the annular portion 4'a.
The lower end portion is located outside the air outlet 18 and fitted into the inner periphery of the annular portion 4'a. Note that the lower end of the short conical tube member 19 may be fixed to the outer peripheral edge of the annular plate 17 to be integrated with the annular plate 17.

Reference numeral 23'a denotes an exhaust duct body, which is provided above the fire bed 2 with its center line substantially coinciding with the core of the fire bed 2. 23'b is the exhaust duct main body 23'a
It is an outer cylinder fitted onto the outside of the main body 23'a, and is movable up and down with respect to the main body 23'a. In this embodiment, a protrusion 23'a' is provided at the lower end of the exhaust duct body 23'a, and the outer shell 23'a' is provided with a protrusion 23'a'.
3'b has a vertical groove in the axial direction and a horizontal groove in the circumferential direction 23'.
A plurality of protrusions 23'a' are provided, and the protrusions 23'a' are moved up and down along the longitudinal groove to engage with any one of the protrusions 23'b',
The distance between the lower end of the outer cylinder 23'b and the open end of the fire bed 2 can be changed.

The operation of the second embodiment will be explained.

When grilling meat, fish, etc. on the grill 8, the outer cylinder 23'b is fixed at an appropriate lower position with respect to the exhaust duct body 23'a. A part of the air sent into the air passage 3 by the blower fan 5 is supplied as combustion air to the heat source in the fire bed 2 from the vent 2a,
The remaining air passes through each through hole 17a of the annular plate 17 of the vortex generator 10' as vortex air, and then enters each air outlet 18.
It is blown out in a certain direction from The air blown out from each air outlet 18 becomes a clockwise turbulent flow along the wall surface of the conical short cylindrical member 19, and the swirling current rises, surrounding the smoke and hot air generated from the fire bed 2. When the exhaust fan 22 operates, the air is sucked into the exhaust duct main body 23'a through the outer cylinder 23'b.

(Effects of the Invention) As understood from the above explanation, according to the present invention, the smoke generated by grilling meat, fish, etc. in the oven is surrounded by a vortex of air that is resistant to external disturbances. Since the air is discharged outdoors from the exhaust duct as an upward current, the indoor air is not easily polluted by smoke, and the most delicious grilled meat, grilled fish, etc. can be eaten in a clean air environment. In addition, since the combustion air and swirl air are fed from the same air source to the furnace body, the blowing structure is simple.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the device used in the smoke evacuation method for a furnace according to the present invention, and FIG. 2 is a half cutaway of the vortex generator used in the first embodiment. FIG. 3 is a side view of the same half cut away, FIG. 4 is a sectional view of the second embodiment, and FIG. 5 is a plane view of the annular plate used in the second embodiment. It is a diagram. 1: Furnace body, 2: Fire bed, 2a: Ventilation hole, 3:
Air passage, 4, 4': Outer shell, 4a, 4'a: Annular part (opening), 5: Ventilation fan, 6: Air duct, 8: Grid, 10, 10': Vortex generator, 11: circular top plate,
12: Short tube, 13a: Air inlet, 13b: Air outlet, 14: Annular bottom plate, 15: Guide vane, 16 Guide plate, 17: Annular plate, 17a: Through hole, 18: Air outlet, 18a: Opening , 19: conical short cylinder member,
22: Exhaust fan, 23, 23'a, 23'b: Exhaust duct.

Claims (1)

[Claims] 1. When grilling food on a stove, the air supplied to the furnace body is divided into combustion air and whirlpool air, and the whirlpool air is distributed around the outer periphery of the open end of the fire bed. A combustion furnace characterized in that smoke generated by combustion is guided to a vortex generator provided therein, surrounded by a vortex of air blown out from the vortex generator, and discharged from an exhaust duct provided above the furnace main body. Method. 2. The outer shell 4 of the furnace body 1, which has an air passage 6 in which a blower fan 5 is installed, surrounds the grate 2, which is provided with a ventilation hole 2a for combustion air, across an air passage 3, and the outer shell 4 An annular top plate 11, a short cylinder 12 whose end face is fixed to the annular top plate 11, and the short cylinder 1 are provided in the opening.
In the space defined by the annular bottom plate 14, which has an annular air inlet 13a for swirling air between the inner peripheral surface and the outer peripheral edge of 2, the annular top plate 11, the short tube 12, and the annular bottom plate 14, A vortex generator 10 is provided which is fixed and has a plurality of guide vanes 15 that bias the air introduced from the air passage 3 through the air inlet 13a toward the center of the annular top plate 11, and is arranged above the furnace main body 1. A smoke exhaust system for a furnace, characterized in that an exhaust duct 23 equipped with an exhaust fan 22 is disposed at the top. 3. The outer shell 4' of the furnace body 1 having the air passage 6 in which the blower fan 5 is installed surrounds the fire bed 2 provided with the ventilation holes 2a for combustion air across the air passage 3,
At the opening of the outer shell 4', there is provided an annular plate 17 in which a plurality of vortex air holes 17a connected to the air passage 3 are arranged on the circumference; An air outlet 18 with 18a oriented in a constant direction in the circumferential direction, and a cone that surrounds the outside of the air outlet 18 and has a smaller diameter on the upper side for deflecting the air blown from the air outlet 18 toward the center. a vortex generator 10' comprising a short cylindrical member 19;
A smoke exhaust system for a furnace, characterized in that an exhaust duct 23'a having an exhaust fan 22 is disposed above the furnace body 1.