Patent Application
20120273978
The present invention is directed to a centrifugal fan device and, in particular, a centrifugal fan device which is adapted for delivering a fragrance or an insecticide to an environment during use.
Many devices and apparatuses have been developed for delivering a fragrance (such as an air freshener) or insecticide (for example, citronella) to an environment of use. Some devices disseminate the fragrance or insecticide (collectively referred to as a compound) using passive means. Examples of devices with passive means include devices having a compound evaporate from a substrate or membrane which disseminate the compound into the environment. Other passive devices have a reservoir which contains a compound which is released into the environment as the compound evaporates.
In addition to the aforementioned passive devices, active devices have been developed to aid in the dissemination of the compound. Some active devices have fans which enhance the dissemination of a compound from either a substrate, membrane or reservoir. Still other devices have a heat source, separately or in combination with a fan, to disseminate the compound into the environment.
There is a need in the art for an improved apparatus for enhanced compound delivery.
The present invention is directed to a centrifugal fan device which is adapted for delivering a compound, such as a fragrance or insecticide, to an environment of use. Advantageously, the device has a reservoir for containing the compound and a compound permeable substrate. The substrate includes a series of legs or wicks which extend from a horizontal surface of the substrate to the reservoir, whereby the compound is wicked from the reservoir to the horizontal surface.
In one advantageous form, the horizontal surface of the substrate forms a top over the reservoir. In an alternative form, a cap or plug is disposed between the reservoir and the substrate, forming a cover over the reservoir. The cap or plug has holes of a sufficient size which allow the legs or wicks to extend through the holes, and into the reservoir, thereby allowing the compound to be wicked from the reservoir to the horizontal surface of the substrate.
A fan motor is disposed within a fan housing, and a centrifugal fan is connected to the motor. A cover having at least one aperture on a top surface is disposed over the centrifugal fan. The cover provides for a side passage from the centrifugal fan to the environment of use.
During operation, advantageously, the centrifugal fan draws in air from the environment of use through the aperture in the top of the cover, axially down to the centrifugal fan, radially across the compound permeable substrate, and out the side passage, back to the environment of use. In one specific embodiment, the side passage is defined by a gap formed between the cover and a base containing the reservoir.
The present invention, in one form thereof, comprises an apparatus for delivering a compound to an environment of use. The apparatus comprises a base having an exteriorly disposed reservoir defining a center cavity. The reservoir contains a compound. A compound permeable substrate has a substantially horizontal surface and at least one wick extending from the substrate into the reservoir. When a compound is disposed in the reservoir, the compound will be wicked from the reservoir onto the compound permeable substrate. A fan motor is disposed in the center cavity. A centrifugal fan is operatively associated with, and extends upward from, the fan motor. A cover is disposed over the centrifugal fan. The cover has at least one aperture through a top surface and provides a side air passage from the centrifugal fan to the environment of use.
In one embodiment, the cover comprises a plurality of apertures. In an alternative embodiment, the cover comprises a disc spaced from a main portion of the cover and is disposed over the at least one aperture. In a further specific form, the disc is attached to the main portion of the cover via a plurality of legs.
In accordance with another specific embodiment of the present invention, the base is annularly shaped, as is the reservoir defining the center cavity into which the fan housing is disposed.
The present invention, in another form thereof, is an apparatus for delivering a compound to an environment of use comprising a reservoir for containing a compound and a compound permeable substrate having a substantially horizontal surface. At least one wick extends from the substrate into the reservoir, wherein, when a compound is disposed in the reservoir, the compound will be wicked from the reservoir onto the compound permeable substrate. A centrifugal fan is at approximately a same level as a top surface of the compound permeable substrate. A cover is disposed over the centrifugal fan. The cover has at least one aperture on a top surface and provides for a side air passage from the centrifugal fan to the environment of use. During use, the centrifugal fan draws in air from the environment of use, through the aperture in the top of the cover, axially down to the centrifugal fan, radially across the compound permeable substrate, and out the side passage, back to the environment of use.
The above and other aspects of the present invention will be apparent from the following description of the preferred embodiments of the invention and from the accompanying drawings.
The following detailed description of specific non-limiting embodiments of the present invention can be best understood when read in conjunction with the following drawings, where like structures are indicated with like reference numbers.
The present invention will now be described with regard to
The base 20 has an annularly shaped reservoir 22 into which a compound 24, such as a fragrance or insecticide, is disposed. The annularly shaped reservoir 22 defines a cylindrically shaped center cavity 26 into which the fan assembly 40 is disposed. A cap, such as plug 28, has a complementary annular shape to that of the reservoir 22, which completely covers the reservoir 22. Although the base 20 of device 10 is annularly shaped, the base can be triangular, rectangular, pentagonal, etc.
The compound permeable substrate 30 is advantageously annularly shaped, adapted to be disposed over the plug 28. A plurality of wicks 32 extend from a horizontal surface 31 into the reservoir 22 and are, thus, in contact with the compound 24. A series of bores 29 in the plug 28 are of a sufficient size to allow the wicks 32 to extend down from the horizontal surface 31, through the plug 28, to the reservoir 22 below. As a result, the compound 24 is able to be wicked from the reservoir 22 up the plurality of wicks 32 to the horizontal surface 31.
The fan assembly 40 includes a housing 41 which contains an electric motor 42 and batteries 44, although other means for powering the electric motor may be used. Further, the fan assembly 40 includes a centrifugal fan 46. The centrifugal fan 46 further comprises a plurality of fan blades 48. Advantageously, a base 49 of the centrifugal fan 46 is approximately at the same level as a horizontal surface 31 of the compound permeable substrate 30.
Advantageously, the electric motor 42 propels the centrifugal fan 46 with RPMs between 100 and 4,000 and, preferably, between 200 and 600 RPMs. Further, advantageously, the centrifugal fan 46 has between 5 and 15 blades 48 and, preferably, between 10 and 14 blades. The centrifugal fan 46 has a fan blade outlet angle (β) between 30° and 150° and, preferably, between 90° and 145°. The centrifugal fan 46 has a fan blade inner height (Hi) between 5 mm and 15 mm and, preferably, between 9 mm and 12 mm, and has a fan blade outlet height (Ho) between 20% and 100% of the fan blade inlet height and, preferably, 50% of the inlet height. The centrifugal fan 46 has a fan blade inner radius (Ri) between 5 mm and 15 mm and a fan blade outer radius (Ro) of greater than or equal to (≧) 20 mm.
The cover 50 is disposed over the centrifugal fan 46. The cover comprises a plurality of apertures 52. The cover 50 provides for a side air passage from the centrifugal fan 46 to the outside environment, as identified by arrows 60. In one advantageous form, the passage is provided by a gap between the cover 50 and the base 20. The cover 50 is attached to the base 20 using a plurality of legs 54.
During use of the centrifugal fan device 10, the electric motor 42, powered by batteries 44, drives the centrifugal fan 46 to rotate, thereby drawing air in from the environment through the apertures 52 in the cover 50, as indicated by arrow 62. The air continues axially downward to the centrifugal fan 46. Then, the centrifugal fan 46 forces the air over the horizontal surface 31 of the compound permeable substrate 30 and, finally, the air exits the device 10 through the gap between the cover 50 and base 20, as identified by arrows 60.
Since the centrifugal fan 46 is substantially at the same height as a horizontal surface 31, and it directly forces air across the surface, the size of the horizontal surface 31 is minimized, as compared to the size it would have to be to achieve the same compound dispersement were the fan not at the same height as the substrate.
In addition, the centrifugal fan device 10 allows for a 360 degree dispersion of a compound 24 using the centrifugal fan 46, which draws air axially downward, in towards a center of the device, and blows air radially 360 degrees over a compound permeable substrate 30, which, as a result, becomes an evaporating surface.
Although the reservoir 22 is located below the centrifugal fan 46 in device 10, a reservoir and compound permeable substrate can be located above the centrifugal fan, e.g., in the cover section of the device.
Referring now to
Cover 150 comprises a disc 157 which is disposed over aperture 156. A plurality of legs 158 attach the disc 157 to a main portion 159 of the cover. During use of the centrifugal fan device 110, when the centrifugal fan motor 142 is energized, thereby causing the centrifugal fan 146 to spin, air is drawn in from the environment between the disc 157 and a main portion of the cover 159, as indicated by arrow 161. Air continues through the aperture 156, as indicated by arrow 162, and is then blown radially 360 degrees over the horizontal surface 131 of the compound permeable substrate 130, which thereby acts as an evaporating surface for the compound 124.
It will now be apparent that the present centrifugal fan device provides features and advantages not found in prior devices for delivering a fragrance or insecticide. For example, the combination of the centrifugal fan 46,146, and its location adjacent the compound permeable substrate 30,130, allows for better compound delivery, as compared to other known passive and/or heated devices.
A further advantage of the present centrifugal fan device is that it allows for a small, more compact device, due to better air flow across the compound permeable substrate 30,130. As a result, the present centrifugal fan device 10,110 allows the compound permeable substrate 30,130 to have a smaller surface area and requires fewer wicks 32,132 and/or allows for a reduction in the size of wicks 32,132, as compared with prior devices, in order to achieve the same compound 24,124 delivery to the environment of use.
An additional advantage of the present centrifugal fan device is that it has less resistance to air flow, as a result of the present configuration, thus requiring a minimal amount of energy and, thus, prolonging battery life, as compared with prior devices.
The exemplary embodiments herein disclosed are not intended to be exhaustive or to unnecessarily limit the scope of the invention. The exemplary embodiments were chosen and described in order to explain the principles of the present invention so that others skilled in the art may practice the invention. As will be apparent to one skilled in the art, various modifications can be made within the scope of the aforesaid description. Such modifications being within the ability of one skilled in the art form a part of the present invention and are embraced by the appended claims.
