JP2002349923A - Exhaust device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve further suction performance for a polluted gas A2, and restrict fouling of the lower half part of an exhaust duct 7 in an exhaust device, in which an electric exhaust-fan 2 is placed in a casing 3, the exhaust duct 7 for the fan 2 is provided in the top of a range for indirect suction and then discharging of the gas A2. SOLUTION: A ring 5 for wind-direction control and speedup is provided in the vicinity of the front of the fan 2, and the ring 5 is centered on the axis of the fan 2. An outlet 8 is provided between the exit side of the ring 5 and the duct 7. The ring 5 is formed in a band shape, having a diameter gradually reducing in the direction from the fan 2 the duct 7; a wind-direction control part 15 is formed in the upper half of the internal periphery of the ring; the part 15 receives the swirl flow from the fan 2 and induces it in the direction of the center of the ring. The polluted gas A2 is sucked from the inlet 8 to be merged in a discharge flow B of the fan 2 and then is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust device which is attached to an upper part of a range of a kitchen in a general household and is used for outdoor discharge of pollutant gas such as combustion gas or steam, smoke, cooking vapor or the like by cooking. is there.

[0002]

2. Description of the Related Art An exhaust system for a range of a general household or the like is of a type of "direct intake / exhaust system using an electric exhaust fan" for directly sucking the polluted gas from the intake side of an exhaust fan and forcibly exhausting the air outdoors. The mainstream.

In the above-mentioned "direct suction / exhaust system", the polluted gas to be forcibly exhausted comes into direct contact with the rotating blades, so that the oil and fine suspended matter in the polluted gas adhere to and deposit on the rotating blades. Inevitably, such a deposition state causes a decrease in the exhaust performance due to the rotating blades, an increase in the rotating torque of the rotating blades, an increase in the rotational vibrations of the rotating blades, and a clean room in which respect for cleanliness must be respected. There is a drawback that the sense of filth is further amplified.

Therefore, as an exhaust device for solving the above-mentioned difficulties, Japanese Patent Application Laid-Open No. Hei 10-318196 (Japanese Patent Application No. Hei 9-3672) has been proposed.
No. 94), by providing an exhaust flow rectifier on the exhaust side of an exhaust fan, and allowing the polluted gas to be sucked into the exhaust flow of the exhaust fan rectified by the exhaust flow rectifier.
There is a proposal of an "indirect suction and exhaust system" in which the polluted gas can be forcibly exhausted without passing through an exhaust fan.

[0005]

The above-mentioned prior art indirect suction / exhaust system eliminates the disadvantages of the above-mentioned "direct suction / exhaust system", but has a low suction performance for polluting gas and is inferior in exhaust performance. At the same time, the rectifying action of the exhaust air by the exhaust rectifier only slightly straightens the outer layer portion of the swirling air layer discharged from the exhaust fan, so that the sucked pollutant gas diffuses in the exhaust duct. Since the flow causes the “contaminants in the polluted gas” to adhere to the entire circumference of the exhaust duct, cleaning the exhaust duct located at a high place is troublesome and troublesome, and lacks daily maintenance.

On the other hand, ordinary buildings such as general dwellings have voids in the walls of the building walls and spaces in the ceiling and attic,
Since no appropriate forced ventilation means is adopted for the voids / spaces, there is a problem that dew condensation or early corrosion occurs due to moisture in the air.

[0007] The present invention provides an exhaust device that solves the above-mentioned disadvantages of the prior art.

[0008]

An exhaust system which solves the above technical problem is described in an exhaust system in which an electric exhaust fan is provided in a casing and an exhaust duct for the exhaust fan is provided. A wind direction regulating speed-up ring having a ring center on the axis of the exhaust fan, and an intake port provided between the outlet side of the wind direction regulating speed-up ring and the exhaust duct. The speed ring is a band-shaped ring that reduces the ring diameter in the direction of the exhaust duct from the exhaust fan, and a wind direction restricting unit that receives the swirling flow exhaust of the exhaust fan and guides the wind direction toward the ring center of the band-shaped ring. A structure is provided in which the exhaust gas is required to be sucked from the intake port, merged with the exhaust flow of the exhaust fan, and discharged.

[0009] That is, the exhaust device of the present invention is an indirect device in which the combustion gas of the range or the contaminated gas of the cooking vapor due to the range is sucked and combined with the forced flow exhaust of the exhaust fan and discharged from the exhaust duct without passing through the exhaust fan. In the exhaust device of the exhaust type, the swirling flow of the exhaust gas generated on the exhaust side of the exhaust fan is gathered into the lower half portion of the ring body by the "wind direction regulating speed increasing ring of the above-described configuration", and is converted into a substantially straight flow. At the same time, the structure is characterized in that the speed is increased and the function of sucking and contaminating the polluted gas by the exhaust stream is particularly improved.

In order to further improve the above-mentioned specific action, the wind direction regulating speed-up ring is provided with a wind direction regulating section of the above-mentioned constituent element, which has a shape of a swirling flow having a shape moving away from the center of the annular body in the flow direction of the swirling flow. A guide groove and a fluid contact wall portion which stands up at the end of the swirling flow guide groove and forms a substantially radial contact wall of the annular body "are adopted.

Further, the air intake duct of the exhaust fan of the exhaust device having the above-described structure is formed in a form of sucking air from the ceiling space opening into the building ceiling space, and the exhaust fan communicates with the building ceiling space and the building ceiling space. The form of the forced suction ventilation system of the space in the wall of the building wall.

[0012]

In the exhaust system of the present invention having the above-described structure, the wind direction regulating speed-up ring of the band-shaped ring is present on the exhaust side of the exhaust fan to guide the exhaust flow in the swirling form of the exhaust fan to the center of the band-shaped ring. At the same time, the exhaust flow is further speeded up by forcible passage of the belt-shaped ring having the front reduced diameter, so that the exhaust flow of the rectified high-speed flow is “ `` Strong peripheral gas suction action '', the polluted gas of the required exhaust gas is sucked very effectively from the inlet opening the opening to the rectified high-speed flow and merges with the exhaust flow of the exhaust fan to be effective. Can be exhausted outdoors.

[0013] Then, the exhaust gas that has passed through the wind direction regulating speed increasing ring and sucked and joined the polluted gas is concentrated in the lower half of the exhaust duct. Has the effect of being concentrated only in the lower half.

Further, in the case of the form of intake from the ceiling space, forced ventilation of "ceiling space / air in the building wall communicating with the ceiling space" utilizing a range exhaust device becomes possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an exhaust system 1 according to an embodiment of the present invention applied to a range of a cooking place such as a general home will be described with reference to FIGS. That is, an exhaust fan 2 that rotates with an electric motor is provided inside a casing 3 installed above a cooking stove (not shown), and contains combustion gas, oil vapor, cooking smoke, steam, and the like generated from the cooking stove. In the exhaust device 1 for sucking the polluted gas A2 and forcibly exhausting it outdoors, the exhaust device 1 is provided with a band-shaped wind direction regulating speed increasing ring 5 (hereinafter simply referred to as a wind direction regulating ring 5) on the exhaust side near the front surface of the exhaust fan 2. ).

The housing 3 is provided with an intake duct 6 opening into the ceiling space of a ceiling 21 of the building, and an exhaust duct 7 projecting from the wall 20 of the building through an opening 9. An intake port 8 having a hood 4 that opens downward and forms an inverted funnel shape is provided between an outlet portion of the exhaust duct 5 and an inlet portion of the exhaust duct 7.

The intake port 8 is mounted so as to open above the range of the cooking place. By rotating the exhaust fan 2, the air A 1 in the ceiling space is sucked from the intake duct 6 and the air is exhausted from the exhaust duct 7. Simultaneously with the forced exhaust, the polluted air A2 is sucked from the intake port 8 into the exhaust stream B of the air A1 on the outlet side of the wind direction regulating ring 5, and the mixed gas A3 obtained by sucking the polluted air A2 into the exhaust stream B is discharged into the exhaust duct 7. This is an exhaust process for exhausting air outdoors from the opening 9 of the terminal.

More specifically, the wind direction restricting ring 5 (see FIG. 3 and FIG. 4) has a front shrinkable portion in which a "tapered ring portion 12 for reducing the ring diameter forward" is integrated in front of a short and small ring-shaped annular portion 11. An inner diameter of the upper half portion of the tapered ring portion 12 is formed into a band-shaped ring having a diameter of “the exhaust guide groove 13 whose shape gradually increases in the direction of the swirl flow F of the exhaust flow B of the exhaust fan 2, At the end of the exhaust guide groove 13, a wind direction restricting portion 15 comprising an impact wall portion 14 forming an impact wall in a ring radial direction is continuously provided at substantially equal pitches (seven in this embodiment).

Then, the swirl flow F of the exhaust flow B is received by the wind direction restricting portion 15 and the wind direction is guided toward the center of the wind direction restricting ring 5, so that the exhaust flow B is gathered in a substantially lower half of the wind direction restricting ring 5. At the same time, the speed of the exhaust flow B is increased by "reducing the gas passage cross-section by reducing the diameter of the tapered ring portion 12 of the wind direction restricting ring 5" and forcedly sent into the exhaust duct 7. Then, the high-speed exhaust gas B, which forms a substantially laminar flow, strongly absorbs the polluted air A2 rising from the intake port 8, forms a mixed gas A3, and forcibly sends the mixed gas A3 to the exhaust duct 7. Made up of

In the exhaust device 1 of this embodiment, the diameter of the exhaust fan 2 is about 20 cm, and the wind direction restricting ring 5 is "the inlet side diameter D1 = about 23 cm, the outlet side diameter D2 = about 20 cm, the ring width. W =
Approximately 8 cm, the maximum height H of the striking wall portion 14 (height at the front end of the tapered ring portion 12) = approximately 1.2 cm,
The lower half circumference of the tapered ring portion 12 of the wind direction restricting ring 5 forms a “bottom raised arc bottom 16” obtained by raising the lower half circumference 17 of a perfect circular shape in the inward direction. Then, the intake duct 7 (FIG. 2)
(See (B)) It has a separate structure that can be detachably attached to the casing 3.

In the exhaust device 1 of the above embodiment, since the wind direction regulating ring 5 is present and the lower half circumference of the wind direction regulating ring 5 is composed of the above-mentioned "bottom raised circular bottom 16", the exhaust flow B of the exhaust fan 2 is increased. Presents a compressed laminar flow in which the swirling flow is reduced and the speed is increased, and the compressed laminar flow is condensed in the lower half zone of the delivery zone of the exhaust fan 2, and the bottom portion of the high-speed flow has the highest speed (The illustrated exhaust flow B has a top point flow velocity S1 of about 3.0 meters per second,
The flow rate at bottom point S2 was measured at about 9.0 meters per second).

As described above, the suction action of the polluted air A2 from the intake port 8 is increased, and the polluted air A2 rising from the range or the like is increased.
Is very efficiently sucked and merged with the exhaust stream B to form a mixed gas A3, which enables effective outdoor exhaust.

The mixed gas A3 is supplied to the exhaust duct 7
, The contamination of the inner periphery of the exhaust duct 7 due to the polluted gas A2 contained in the mixed gas A3 is limited to only the lower half, and the cleaning of the exhaust duct 7 located at a high place in the daily cleaning maintenance is restricted. Work becomes easier.

Further, in this embodiment, the exhaust fan 2
Opening 9 is open to the ceiling space of the building,
Due to the forced ventilation effect by sucking the stagnant air in the attic space and the stagnant air in the wall space and attic space of the building wall communicating with the attic space, the stagnant air due to the moisture It is possible to effectively prevent adverse effects on daily life such as "mold generation", "promotion of corrosion", and "humidification of indoors".

Next, another embodiment of the exhaust device 1 of the present invention will be described with reference to FIGS. That is, the one shown in FIG. 5 is composed of the same “exhaust fan 2, wind direction regulating ring 5, casing 3, intake duct 6” as in the embodiment of FIG. 1, and the intake duct 6 of FIG. It has an opening 9 on the axis, and has a structure of sucking indoor air A1 such as a cooking room in which the exhaust device 1 is installed.

On the other hand, the one shown in FIG. 6A also has a wind direction regulating ring 5 and the like, and the intake duct 6 is
In the combined structure of the embodiment of FIG. 5, an opening 9A opening behind the ceiling and an opening 9B opening indoors are provided side by side, and these two openings 9A and 9B have opening / closing dampers 18 respectively. Any of them or "any" can be used in an open state.

FIGS. 6B and 6C show the wind direction regulating ring 5.
Another embodiment is shown, and a wind direction restricting ridge 19 for receiving the swirl flow F of the exhaust flow B and restricting the wind direction toward the center of the ring is connected to the upper half inner periphery of the tapered ring 12. This figure 6
(B) and (C) also have an operation similar to that of the embodiment of FIG.

The center line of the air flow direction restricting ring 5 and the exhaust duct 7 of the embodiment shown in FIG. The "square section of one side is about 24 cm" is set, and the interval (width of the intake port 8) between the wind direction regulating ring 5 and the inlet of the exhaust duct 7 is set to about 18 cm. Style B
Has a low exhaust resistance, and the above-mentioned action is stabilized.

The exhaust device of the present invention is not limited to the above-described embodiment. The intake duct 6 and the exhaust duct 7 have a circular cross section, the intake duct 6 has an outdoor air intake form, the intake duct 6 has In some cases, a “shutter that automatically opens and closes with wind pressure” may be provided at the opening of the exhaust duct 7.

[0030]

As described above, the exhaust system of the present invention is capable of effectively exhausting polluted gas from a kitchen room, a cooking room, or the like to the outside without directly contacting the polluted gas with the exhaust fan. Since it is possible to "prevent the exhaust fan from being contaminated and prevent the upper half circumference of the exhaust duct from being contaminated" by the polluted gas required for exhaust, daily maintenance of the exhaust device becomes particularly easy.

In the type in which the air behind the ceiling is sucked from the intake duct, the forced ventilation of the air behind the ceiling and the air in the building wall can be performed in conjunction with the outdoor exhaust of the polluted gas. Troubles such as dew condensation, humidification, mold generation, and early corrosion caused by stagnant air in the back and walls can be effectively prevented. There are various effective effects on daily life as described above.

[Brief description of the drawings]

1A and 1B show an exhaust device according to an embodiment of the present invention, wherein FIG. 1A is an overall front view, and FIG.

2A and 2B show the exhaust device of the embodiment shown in FIG. 1, wherein FIG. 2A is a right side view thereof, and FIG.

3A and 3B show a wind direction regulating speed-up ring of the exhaust device of the embodiment of FIG. 1, wherein FIG. 3A is a front view thereof, FIG.
(C) is an explanatory view of its operation.

FIG. 4 is a partial front view for explaining the operation of the exhaust device of FIG. 1 embodiment;

FIG. 5 shows another embodiment of the exhaust device of the present invention,
(A) is a perspective view of the intake duct, (B) is an overall front view thereof.

FIG. 6 shows another embodiment of the exhaust device of the present invention,
(A) is the whole front view, (B) is the front view of the wind direction regulating high-speed ring, (C) is the EE end view of (B).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust apparatus 2 Exhaust fan 3 Casing 4 Hood 5 Wind direction regulation speed-up ring 6 Intake duct 7 Exhaust duct 8 Intake port 11 Annular part 12 Tapered annular part 13 Exhaust guide groove 14 Shock wall part 15 Wind direction regulating part 16 Bottom raised arc bottom A1 Intake A2 Contaminated gas A3 Mixed gas B Exhaust flow F Swirling flow

Claims (3)

[Claims] 1. An exhaust system in which an electric exhaust fan is provided in a casing and has an exhaust duct for the exhaust fan, wherein an exhaust side near the front surface of the exhaust fan is provided with a ring center on an axis of the exhaust fan. And a suction port is provided between the outlet side of the wind direction regulating speed-up ring and the exhaust duct, and the wind direction regulation speed-up ring has a ring diameter in the direction from the exhaust fan to the exhaust duct. And a wind direction restricting portion that receives the swirling flow exhaust of the exhaust fan and guides the wind direction toward the center of the ring of the band-shaped ring is provided continuously with the upper half portion of the ring inner periphery, An exhaust device having a structure in which exhaust gas required is sucked from an intake port, merged with the exhaust flow of the exhaust fan, and discharged. 2. A wind direction restricting portion of the wind direction restricting speed increasing ring comprises an exhaust guide groove having a shape that is away from the center of the ring in the direction of the exhaust swirling flow of the exhaust fan, and a collision wall portion at the end of the exhaust guide groove. 1 exhaust device. 3. The exhaust device according to claim 1, further comprising an intake duct of an exhaust fan, wherein an opening of the intake duct has an intake form that opens into a space above a ceiling of a building to which a casing is attached.