JP2003148779A - Exhaust device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the suction performance of the polluted gas A2 and to reduce pollution of an exhaust duct 7, in an exhaust device in which an electrically-driven exhaust fan 2 is provided inside a casing 3, the exhaust duct 7 of the exhaust fan 2 is provided on an upper part of a range in a cooking room, and the polluted gas A2 generated from the range is indirectly sucked and exhausted. SOLUTION: An air direction regulating and speed-increasing ring 5 having the ring center on the axis of the exhaust fan 2 is provided on the exhaust side in the vicinity of a front side of the exhaust fan 2, an air outlet 8 is provided between an outlet side of the air direction regulating and speed-increasing ring 5 and the exhaust duct 7, the air direction regulating and speed-increasing ring 5 is formed of a strip-like ring with the diameter thereof contracted in the direction from the exhaust fan 2 to the exhaust duct 7, an air direction regulating projecting bar 13 to receive the swirl exhaust of the exhaust fan 2 and guide the air in the direction of the ring center of the strip-like ring is expanded in the width direction of the strip-like ring and continuously provided along the entire inner circumference of the strip-like ring with intervals, the polluted gas A2 is sucked from the air outlet 8, and merged in an exhaust flow B of the exhaust fan 2 and exhausted in the structure of the exhaust device 1.

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 mainly attached to an upper part of a range of a kitchen of a general household and is used for outdoor discharge of combustion gas and steam, smoke, cooking vapor, and other polluted gases. is there.

[0002]

2. Description of the Related Art Exhaust devices for ranges such as general households are in the form of a "direct intake / exhaust system using an electric exhaust fan" in which the polluted gas is directly sucked from the intake side of the exhaust fan and forcedly exhausted to the outdoors. It is mainstream.

In the above-mentioned "direct intake / exhaust system", the polluted gas to be forcibly discharged directly contacts the rotary blades, so that oil and fine suspended matter in the polluted gas adhere to the rotary blades and accumulate. This phenomenon is unavoidable, and if such an adhered and accumulated state occurs, the exhaust performance of the rotary blades will deteriorate and the rotation torque and rotation noise of the rotary blades will increase. There is a problem that the feeling of filth is further amplified.

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

[0005]

Although the above-mentioned conventional indirect suction / exhaust system solves the above-mentioned drawbacks of the "direct suction / exhaust system", it has a low suction force of polluted gas and is inferior in exhaust performance. At the same time, the rectifying action of the exhaust air by the exhaust rectifying body causes only a slight contraction of only the outer layer portion of the swirling air layer discharged from the exhaust fan, so that the sucked polluted gas diffuses in the exhaust duct. Since the "contaminant substance in polluted gas" is attached to the entire circumference of the exhaust duct by flowing the exhaust duct, the cleaning work of the exhaust duct existing at a high place is troublesome and troublesome, and the daily maintainability is lacking.

On the other hand, in a normal building such as a general house, although there are voids in the wall of the building and spaces in the ceiling and attic,
Since there is no suitable forced ventilation means for the voids / spaces, there is a problem that it causes dew condensation due to air humidity and premature corrosion.

The present invention provides an exhaust system that overcomes the above-mentioned drawbacks of the prior art.

[0008]

An exhaust system that solves the above technical problems is "in an exhaust system having an electric exhaust fan inside a casing and having an exhaust duct for the exhaust fan, in the vicinity of the front face of the exhaust fan. On the exhaust side of the exhaust fan, there is provided a wind direction restricting speed increasing ring having a ring center on the axial center of the exhaust fan, and an intake port is provided between the outlet side of the wind direction restricting speed increasing ring and the exhaust duct. The fast ring is a band-shaped ring that reduces the ring diameter from the exhaust fan toward the exhaust duct, and receives the swirling exhaust gas of the exhaust fan to guide the wind direction toward the ring center of the band-shaped ring. But,
The strip ring extends in the band width direction and is continuously provided along the entire inner circumference of the strip ring at intervals. The exhaust gas is sucked from the intake port and merges with the exhaust flow of the exhaust fan. It has a structure that allows it to be discharged.

That is, the exhaust system according to the present invention is an "indirect type in which the combustion gas of the range and the polluted gas of the cooking vapor by the range are not passed through the exhaust fan but are suction-merged with the forced flow exhaust of the exhaust fan and exhausted from the exhaust duct. In the "exhaust type exhaust device", the swirling flow of the exhaust gas generated on the discharge side of the exhaust fan is gathered into the central zone on the outlet side of the ring body by the "wind direction regulation speed increasing ring having the above-described structure" to be a substantially straight flow. The structure is characterized in that conversion regulation is performed, and at the same time, the speed is increased so as to improve the suction confluence function of the polluted gas by the exhaust flow.

Further, the intake duct of the exhaust fan of the exhaust device having the above-mentioned structure is constructed to suck air in the ceiling space opening to the ceiling space of the building, and the exhaust fan communicates with the building ceiling space and the building ceiling space. In the form of a forced suction ventilation system for the space inside the building wall.

[0011]

In the exhaust system of the present invention having the above-described structure, the wind direction regulating speed increasing 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 central direction of the band-shaped ring. The flow rate of the rectified high-speed flow is increased because the flow rate of the rectified high-speed flow is further increased by forcibly passing through the band-shaped ring in the forward diameter reduction mode. Has a "suction action of strong peripheral gas from the entire circumference of 360 ° of the rectified high-speed flow", and the polluted gas of the exhaust gas is extremely effectively sucked from the intake port which faces the opening to the rectified high-speed flow. It can be combined with the exhaust flow of the exhaust fan to provide effective outdoor exhaust.

[0012] Then, the exhaust gas flow which has passed through the wind direction regulation speed increasing ring and suctioned and merged the polluted gas is converted into the polluted gas by 360
° Suction and merge around the periphery to straighten the flow to pass through the exhaust duct, so there is less contact between the exhaust duct inner periphery and polluted gas, and the pollution degree of the exhaust duct inner periphery is less than that of the conventional swirl flow exhaust. Is significantly reduced.

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

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an exhaust system 1 according to an embodiment of the present invention applied to a cooking range of a general household will be described with reference to FIGS. That is, an exhaust fan 2 rotating an electric motor is installed inside a casing 3 installed above a cooking table (not shown), and contains combustion gas, oil vapor, cooking smoke, steam, etc. generated from the cooking table. In the exhaust device 1 that sucks the polluted gas A2 and forcibly exhausts it to the outdoors, the exhaust device 1 has a belt-like wind direction regulation speed increasing ring 5 (hereinafter, simply referred to as the wind direction regulation ring 5) on the exhaust side near the front surface of the exhaust fan 2. That is).

The housing 3 is provided with an intake duct 6 that opens into the ceiling space of the ceiling 31 of the building, and an exhaust duct 7 that projects an opening 9 from the wall 30 of the building, and the wind direction control ring thereof. An intake port 8 having a hood 4 which opens downward and has a reverse funnel shape is set between the outlet portion of 5 and the inlet portion of the exhaust duct 7.

The air intake port 8 is attached so as to be opened above the range of the kitchen, and the exhaust fan 2 is rotated to suck the air A1 in the ceiling space from the intake duct 6 to exhaust it from the exhaust duct 7. At the same time as the forced exhaust, the polluted air A2 is sucked into the exhaust flow B of the air A1 on the outlet side of the wind direction restricting ring 5 from the intake port 8, and the mixed gas A3 in which the polluted air A2 is suction-combined into the exhaust flow B is discharged through the exhaust duct 7 The exhaust process is such that air is exhausted outdoors from the end of (the exhaust duct 7 has a rectangular cross section).

More specifically, the wind direction restricting ring 5 (see FIG. 3) is a band having a front diameter reduction in which a "tapered ring portion 12 for reducing the diameter of the ring forward" is integrally formed in front of the annular portion 11 having a short and small annular shape. A ring is formed on the entire inner circumference of the tapered ring portion 12 by "indenting the peripheral wall of the tapered ring portion 12 and protruding toward the center of the ring body in the band width direction of the ring body (the front-back direction of the wind direction regulating ring 5). The height of the outlet portion of the wind direction regulating ring 5 is set to H, and the starting end of the tapered ring portion 12 serving as a raised base portion is formed into a triangular forward gradual shape having a height of zero. A large number of ridges 13 having a "triangular cross-section" for regulating the wind direction are formed by dividing the inner circumference 360 ° of the ring at an equal pitch and at intervals.
It is lined up.

Then, the swirling flow of the exhaust flow B is received by the wind direction restricting ridges 13 and the wind direction is guided toward the center of the wind direction restricting ring 5 to mitigate the swirling degree of the swirl flow and at the same time, the "contraction of the taper ring portion 12 is reduced. By reducing the cross-sectional area of gas passage due to the diameter, the exhaust flow B is contracted at high speed and forcedly delivered into the exhaust duct 7. Then, the polluted air A2 rising from the intake port 8 is added to the exhaust gas flow B that has been speeded up to form a substantially laminar flow.
Is strongly sucked from the entire 360 ° of the straight contraction flow to form the mixed gas A3, which is forcibly delivered to the exhaust duct 7.

Further, the exhaust device 1 of this embodiment is provided with an exhaust shutter 20 described in detail below. That is (see FIG. 4), a pair of hinges connected to the left and right side walls of the exhaust pipe 21 is fitted in the hollow portion of the rectangular exhaust pipe 21 that fits and is fixed to the front end of the exhaust duct 7 to form the front end portion of the exhaust duct 7. Half shutter plates 22A and 22B are provided so as to be openable and closable, and when the half shutter plates 22A and 22B are in the closed position shown by the solid line in the drawing, the tips of the half shutter plates 22A and 22B are slightly overlapped to close the inside of the exhaust pipe 21. When the exhaust flow B is generated in the exhaust duct 7, the exhaust shutter 20 of the twin butterfly type automatic opening / closing structure that automatically opens the exhaust duct 7 in the open posture shown by the dotted line by the exhaust flow force of the exhaust flow B is provided. It is installed.

The half shutter plate 22A
22B is attached to and supported by the exhaust pipe 21 "inclined at an inclination angle θ with respect to the perpendicular 23 of the exhaust pipe 21 attached to the exhaust duct 7", and when the exhaust flow B becomes absent, it is caused by its own weight. It has an automatic opening and closing shutter that automatically closes. The half-shutter plates 22A and 22B have a shape in which the lower half portion is bent toward the exhaust duct 7 to form a waist plate, which facilitates the automatic opening and closing. Reference numeral 26 in the figure denotes a stopper for closing the half shutter plates 22A and 22B.

The wind direction restricting ring 5 of the exhaust system 1 of this embodiment has the following formula: "Inlet-side diameter D1 = about 172 grout / outlet-side diameter D2"
= About 152 moulds, ring width W = about 70 moulds, height H of the wind direction regulating ridges 31 = about 10 moulds ".

The exhaust fan 2 of this embodiment is
In order to make the resistance on the suction side of the
The exhaust fan 2 is supported and supported by the “exhaust fan support member 16 made of a single pipe material” shown in FIG.

In one experimental data of the exhaust system 1 of the above-mentioned embodiment, the flow velocity of the contracted high-speed flow of the exhaust flow B is "upper point = 10.6 m / sec, lower point = 13.
5 meters, left outer point = 11.4 meters per second,
Right outside point = 12.7 meters per second, center point = 3.6 meters per second "was measured, and there is a fact that the outer zone of the contracted flow shows a particularly high speed. Suctions ambient gas with extremely high efficiency
The fact that it has an attractive effect was confirmed.

The exhaust system 1 of the above-described embodiment has the above-described action, and the exhaust flow on the delivery side of the exhaust fan 2 forms the above-described contracted high-speed flow and passes through the central portion of the exhaust duct 7. A strong gas suction force is generated around 360 ° of the contracted high-speed flow, and the polluted air A2 can be positively sucked and joined from the intake port 8 to form a mixed gas A3 and exhausted from the exhaust duct 7.

Since the polluted air A2 that has been suction-merged is generated in the central portion of the exhaust duct 7 and the polluted air A2 is actively sucked, the polluted air A2 that flows in contact with the inner circumference of the exhaust duct 7 is extremely small. The progress of pollution of the exhaust duct 7 is significantly less than that of the conventional structure.

Further, the exhaust fan 2 of this embodiment is used.
Since the opening 9 of is open to the ceiling space of the building,
Because the stagnant air behind the ceiling and the stagnant air in the space inside the attic and the attic space of the building that communicates with the above-ceiling space are sucked in and forced ventilation is performed, the humidity of such stagnant air causes It is possible to effectively prevent adverse effects on daily life such as "mold generation", "corrosion acceleration", "indoor humidification", and the like.

Next, another embodiment of the exhaust system 1 of the present invention will be described with reference to FIG. That is, what is shown in FIG. 5 includes the same “exhaust fan 2, wind direction restricting ring 5, casing 3, and intake duct 6” as in the embodiment of FIG. 1, and the intake duct 6 is opened on the axial center of the exhaust fan 2. It has a portion 9 and has a structure for sucking indoor air A1 in a cooking chamber or the like in which the exhaust device 1 is installed.

The exhaust system of the present invention is not limited to the above-mentioned embodiment, and the wind direction regulating ring 5 is "a structure in which a separate ring with the wind direction regulating ridge 13 is combined with a ring body having the tapered ring portion 12".
, 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 “automatic opening / closing shutter that automatically opens and closes by wind pressure” may be provided at the opening of the intake duct 6. Further, although not shown, a combined form of the embodiments of FIGS. 1 and 5 may be formed into a double intake port 8 with a damper that opens to the ceiling and indoors.

[0029]

As described above, the exhaust device of the present invention is capable of effectively discharging polluted gas in a kitchen room, a cooking chamber, etc. to the outside without compulsory contact between the polluted gas and the exhaust fan. Since "contamination of the exhaust fan and reduction of inner peripheral pollution of the exhaust duct can be prevented" by the polluted gas that requires exhaust, daily maintenance of the exhaust device becomes particularly easy.

In the case where the above-ceiling air is sucked from the intake duct, the forced ventilation of the above-ceiling air and the air inside the building wall is possible in conjunction with the outdoor exhaust of the polluted gas. Condensation due to stagnant air in the building wall
Trouble such as wetting, generation of mold and premature corrosion can be effectively prevented. There are various effective effects in daily life.

[Brief description of drawings]

1A and 1B show an exhaust device according to an embodiment of the present invention, in which FIG. 1A is an entire front view thereof, and FIG.

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

3A and 3B show a wind direction regulating speed increasing ring of the exhaust system of FIG. 1 embodiment, (A) is a front view thereof, (B) is a right side view thereof,
(C) is an enlarged side view of the wind direction regulating ridge, and (D) is an enlarged sectional view of the wind direction regulating ridge.

FIG. 4 shows an exhaust fan shutter of the exhaust device of FIG. 1 embodiment, (A) is a front view thereof, and (B) is a plan view thereof.

FIG. 5 is an overall front view of another embodiment of the exhaust system of the present invention.

[Explanation of symbols]

1 exhaust system 2 exhaust fan 3 casing 4 hood 5 Wind direction regulation speed-up ring 6 Intake duct 7 exhaust duct 8 air intake 11 torus 12 Taper ring 13 Wind direction regulation ridge 20 exhaust shutter 21 Exhaust stack 22A ・ 22B Half shutter plate A1 intake A2 polluted gas A3 gas mixture B exhaust flow

Claims (3)

[Claims] 1. An exhaust device having an electric exhaust fan provided in a casing and having an exhaust duct for the exhaust fan, wherein an exhaust center near the front face of the exhaust fan has a ring center on the axial center of the exhaust fan. And a suction port is provided between the outlet side of the wind direction restricting speed increasing ring and the exhaust duct, and the wind direction restricting speed increasing ring has a ring diameter from the exhaust fan toward the exhaust duct. And a wind direction regulating ridge that receives the swirl flow exhaust of the exhaust fan and guides the wind direction toward the ring center of the band ring.
The strip ring extends in the band width direction and is continuously provided along the entire inner circumference of the strip ring at intervals. The exhaust gas is sucked from the intake port and merges with the exhaust flow of the exhaust fan. An exhaust device characterized by a structure that allows it to be discharged. 2. The exhaust system according to claim 1, further comprising an intake duct for the exhaust fan, wherein the opening of the intake duct is in the form of an intake opening into a space above a ceiling of a building to which a casing is attached. 3. A pair of left and right half shutter plates hingedly connected to the left and right side walls of an exhaust pipe provided in the exhaust duct in an inclined posture with respect to the vertical direction, and in the free state, the inside of the duct is closed by its own weight. The exhaust device according to claim 1, further comprising an automatic opening / closing shutter that is opened by exhaust air pressure.