AU2007202183A1

AU2007202183A1 - Fan device for smoke exhauster

Info

Publication number: AU2007202183A1
Application number: AU2007202183A
Authority: AU
Inventors: Chao-Cheng Chiang; Chi-Hsiung Chiang; I-Wen Chiang
Original assignee: Chiang Chi Hsiung; Chiang I Wen
Current assignee: Chiang Chi Hsiung; Chiang I Wen
Priority date: 2007-05-16
Filing date: 2007-05-16
Publication date: 2008-12-04

Description

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S):: Chi-Hsiung Chiang AND I-Wen Chiang AND Chao-Cheng Chiang ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Nicholson Street, Melbourne, 3000, Australia INVENTION TITLE: Fan device for smoke exhauster The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5102 1 The invention relates to a smoke exhauster including an improved fan device for increasing the air drawing effect thereof and for reducing the noise that may be generated by the smoke exhauster.

Cc Typical smoke exhausters comprise a number of radially 00 Sextended fan blades directly punched or forged or extended from the (fan casing for agitating the air or the like and for generating a circulating air. Due to the directly punching or forming of the fan blades from the fan casing, the fan blades may only be formed with a single curvature and may include a limited or a small area for actuating the air.

For increasing the air drawing effect to the fan device, the applicants have further developed various kinds of typical smoke exhausters comprising a fan device including a number of preformed fan blades to be assembled and secured between two casing members for increasing the air drawing effect to the fan devices.

For example, U.S. Patent No. 6,866,481 to Chiang et al., and U.S. Patent No. 6,945,753 to Chiang et al. discloses two of the typical smoke exhausters each comprising a fan device including a number of preformed and curved and suitably shaped fan blades to be assembled and secured between an upper plate and a lower plate for increasing the air drawing effect to the fan devices.

H-owever, the fan blades include a solid structure that may generate a great noise particularly when the fan blades are rotated or driven or operated in a great speed.

It is accordingly an object of the invention to provide a smoke

O

c- exhauster including an improved fan device for increasing the air tdrawing effect thereof and for reducing the noise that may be generated by the smoke exhauster.

According to the invention there is provided a fan device for a o, smoke exhauster comprising:- 00 oo a housing including an upper plate, and a lower plate disposed

O

N below the upper plate for forming a chamber between the upper plate and the lower plate, the upper plate including a number of slits formed therein, the lower plate including a number of slots formed therein, and including a bore formed therein, and the upper plate including a casing provided therein, the chamber of the fan device being communicating with the bore of the lower plate to allow an air to flow through the bore of the lower plate and to flow into the chamber of the fan device, a motor received in the casing of the upper plate and including a spindle secured to the casing of the upper plate of the housing for allowing the casing of the housing to be rotated and driven by the spindle of the motor and to be rotated relative to the motor, and a number of fan blades disposed in the chamber which is formed between the upper plate and the lower plate of the housing, the fan blades each include an upper portion having a number of ears extended upwardly therefrom and engaged through the slits of the upper plate for securing the fan blades to the upper plate, and each include a lower portion having a number of ears extended downwardly therefrom and engaged through the slots of the lower b plate for securing the fan blades to the lower plate and for securing c the fan blades between the upper plate and the lower plate, and the fan blades each include a curved bottom edge curved Sinwardly and upwardly from the lower plate toward the upper plate to allow the air to flow into the chamber of the fan device before contacting with the fan blades, and the fan blades each include a oo number of orifices formed therein for allowing the air to flow through the orifices of the fan blades and for reducing a noise generated by the fan blades when the fan blades are rotated relative to the motor.

FIG. 1 is a partial exploded view of a fan device for a smoke exhauster; FIG. 2 is a bottomrn perspective view of the fan device for the smoke exhauster; FIG. 3 is a bottom plan schematic view of the fan device for the smoke exhauster; FIG. 4 is a side plan schematic view of the fan device for the smoke exhauster; FIG. 5 is an upper plan schematic view of the fan device for the smoke exhauster; FIG. 6 is a partial exploded and partial cross sectional view of the fan device for the smoke exhauster taken along lines 6-6 of FIG.

illustrating the inner structure of the fan device for the smoke exhauster.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1-5, a fan device 1 for attaching to an outer receptacle (not shown) ofa smoke exhauster comprises a housing L including an upper plate 11 having a recess or depression or I concave 12 formed in the upper portion thereof, or including a casing 13 provided or formed in the middle portion of the upper IDplate I 1 and having the recess or depression or concave 12 formed in the middle portion of the casing 13 for receiving a motor S(FIGS. 5, and including a tube or barrel or hub 14 provided or oo formed or extended outwardly from the middle or center portion of ,i the casing 13 for receiving a spindle 31 that is extended outwardly from the lower portion of the motor 30 (FIGS. 1-3 and and one or more fasteners 16 may be used to secure the spindle 31 of the motor 30 to the hub 14 of the casing 13.

The motor 30 may further include a frame or bracket 32 (FIGS.

6) for attaching or securing to the outer receptacle (not shown) of the smoke exhauster and thus for allowing the casing 13 of the housing 10 to be rotated or driven by the spindle 31 of the motor and to be rotated relative to the motor 30 and the outer receptacle of the smoke exhauster. The upper plate I 1 includes a number of slits 17, 18, such as two rows or two circles of slits 17, 18 formed therein (FIGS. 1, 5) for attaching or securing a number of fan blades 40 to the upper plate 11 of the housing 10. The rows or two circles of slits 17, 18 preferably include different inclinations or are inclined relative to each other, best shown in FIG. 1. The housing 10 further includes a lower plate 20 disposed below the upper plate I 1I and to be secured to the upper plate 11 with the fan blades 40, and for forming a space or chamber 21 between the upper plate 11 and the lower plate The lower plate 20 includes a bore 22 formed therein (FIGS.

'0 1-3) and communicating with the chamber 21 of the housing 10 of

O

the fan device 1, for allowing the air to be drawn through the bore 22 of the lower plate 20 and to be drawn into the chamber 21 of the Ihousing 10 of the fan device 1. The lower plate 20 includes a number of slots 23 formed therein (FIGS. 1-3) and also provided f'or attaching or securing the fan blades 40 to the lower plate 20 of the 00 housing 10. Each of the fan blades 40 include an upper portion 41 Ohaving one or more ears 42 extended upwardly therefrom and engaged through the slits 17, 18 of the upper plate I 1I, and bent or secured to the upper plate 11, for securing the fan blades 40 to the upper plate 11. Each of the fan blades 40 further include a lower portion 43 having one or more ears 44 extended downwardly therefrom and engaged through the slots 23 of the lower plate and bent or secured to the lower plate 20, for securing the fan blades to the lower plate The fan blades 40 may thus be solidly attached and secured between the outer peripheral portion of the upper plate 11 and the lower plate 20. As shown in FIG. 1, each of the fan blades include a curved lower or bottom portion or edge 45 curved inwardly and upwardly from the lower plate 20 toward the upper plate 11 and/or the casing 13 of the housing 10. As shown in FIGS.

1-3, each of the fan blades 40 include a first or outer curved segment 46 and a second or inner planar segment 47 for scooping the air in the chamber 21 of the housing 10. It is preferable that the curved outer segment 46 of the fan blade 40 includes a width equals to or greater than that of the lower plate 20 of the housing 10, but smaller than that of the planar inner segment 47 of the fan blade SThe above-described structure for the housing 10 of the fan device I cl has been disclosed and patented in U.S. Patent No. 6,945,753 to Chiang et al.

ID The fan blades 40 of the housing 10 of the fan device 1 each further include a number of orifices 48 formed therein for allowing Sthe air to flow through the orifices 48 of the fan blades 40 and for oo c reducing the noise that may be generated by the fan blades 40 when the fan blades 40 are rotated or driven or operated in a great speed.

The fan blades of the typical fan devices have no noise reducing orifices formed in the fan blades such that the fan blades of the typical fan devices may generate great noises particularly when the fan blades are rotated or driven or operated in a great speed. It is to be noted that a single fan device 1 has been shown and illustrated in FIGS. 1-6 of the drawing figures, and the smoke exhauster may include two or more fan devices 1 attached to the outer receptacle of the smoke exhauster and each driven by one motor It is further to be noted that the fan blades 40 are shown in the drawing figures to be secured between the upper plate 11 and the lower plate 20, and the fan blades 40 may be disposed or arranged perpendicular to the upper plate 11 and the lower plate 20, or the fan blades 40 may be arranged or disposed to be tilted or inclined relative to the upper plate II and the lower plate 20, best shown in FIGS. 4 and 6, for increasing the air drawing or scooping effect of the fan blades 40. In operation, as shown in FIGS. 1-3 and 6, due to the formation or provision of the curved lower or bottom edges of the fan blades 40, the fan device 1 may include a widely opened lower portion formed and defined by the bore 22 of the lower plate and the chamber 21 of the fan device 1, for allowing the air to flow through the bore 22 of the lower plate 20 and deeper into the tchamber 21 of the fan device 1, before the air may be contacted and Sscooped by the fan blades The formation or provision of the orifices 48 in the fan blades S40 allows the air to flow through the orifices 48 of the fan blades oo 00 Sand to reduce the noise that may be generated by the fan blades and the inclination of the fan blades 40 relative to the upper plate I and the lower plate 20 may further increase the air drawing or scooping effect of the fan blades Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise" and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge in Australia.

Claims

1. A fan device for a smoke exhauster comprising: a housing including an upper plate, and a lower plate disposed Nbelow the upper plate for forming a chamber between the upper plate and the lower plate, the upper plate including a plurality of slits formed therein, the 0O lower plate including a plurality of slots formed therein, and .1 including a bore formed therein, and the upper plate including a casing provided therein, the chamber of the fan device being communicating with the bore of the lower plate to allow an air to flow through the bore of the lower plate and to flow into the chamber of the fan device, a motor received in the casing of the upper plate and including a spindle secured to the casing of the upper plate of the housing for allowing the casing of the housing to be rotated and driven by the spindle of the motor and to be rotated relative to the motor, and a plurality of fan blades disposed in the chamber which is formed between the upper plate and the lower plate of the housing, the fan blades each including an upper portion having a plurality of ears extended upwardly therefrom and engaged through the slits of the upper plate for securing the fan blades to the upper plate, and each including a lower portion having a plurality of ears extended downwardly therefrom and engaged through the slots of the lower plate for securing the fan blades to the lower plate and for securing the fan blades between the upper plate and the lower plate, and the fan blades each including a curved bottom edge curved inwardly and upwardly from the lower plate toward the upper plate b to allow the air to flow into the chamber of the fan device before contacting with the fan blades, and the fan blades each including a plurality of orifices formed therein for allowing the air to flow IDthrough the orifices of the fan blades and for reducing a noise generated by the fan blades when the fan blades are rotated relative e¢ to the motor. oo

2. The smoke exhauster as claimed in claim 1, wherein the fan blades each includes a curved outer segment, and a planar inner segment.

3. The smoke exhauster as claimed in claim 1, wherein the fan blades are disposed inclined relative to the upper plate and the lower plate for increasing an air scooping effect of the fan blades.

4. The smoke exhauster substantially as herein described with reference to the accompanying drawings.

Any invention described or claimed herein.

6. The steps, features, compositions and compounds disclosed herein or referred to or indicated in the individually or collectively, and any and all combinations of any two or more of the steps or features.