FIELD OF INVENTION
The present invention relates to a novel detachable filter and fan assembly which is arranged in such a manner to concentrate wind through a dual converging cone structure and provide dual sided filtration that can overcome high resistance filters. The novel air purifier duct system can easily be attached and detached from a conventional ceiling fan.
BACKGROUND OF THE INVENTION
Air purifiers are widely used in homes, offices and hospitals which is used to purify the polluted air through filtering material in order to filter air. The traditional air purifiers relies on low-sweep centrifugal fans that are too expensive for a middle class household. These centrifugal fans create high static pressure which produces powerful suction that can overcome the high pressure drop created by High Efficiency Particulate Attenuator Filters (HEPA) or Activated Carbon Filters which are needed to clean either particulate matter or noxious gases.
There are conventional air purifier which are installed in room to purify air. But these air purifiers are present as a separate unit to perform purification of polluted air as present in the room. Air conditioners operated in hot weather usually include filters to ensure course particles do not destroy the compressor, but they rarely filter out particulate matter due to the increased strain on the system and reduced airflow produced by the filters. Although there are known ceiling fan dust removers, it is less common to incorporate filters in ceiling fans due to the low static pressure created by these fans. Few other conventional air purifer includes converting the axial fan into a centrifugal fan but that method is labour intensive, difficult, and time-consuming.
Devices and units are already known for purification of air pollution, germs and dust. Further, there are several conventional filter assembly attached to the ceiling fan assembly and are used to remove pollutants, germs and dust.
US5094676 (US '676) discloses a filter and fan assembly utilizes a conventional ceiling fan
having a motor and an upstanding tubular member above the motor which carries electrical wires
to the motor. It discusses a shallow cylindrical shroud is carried on the vertically extending
support members, with the shroud extending a limited distance above the radially extending

arms. A plurality of trays having porous bottoms are supported on the arms and contain a filter medium including a layer of activated charcoal granules covered by a membrane of polyester filaments.
The system disclosd in US '676 places the filter before the fan, as a result it incapable of handling high resistence filters due to the high backflow created by ceiling fan which further lowers an already very low static pressure differential.
US6174340 (US '340) relates to a room air filter apparatus includes a multi-sided housing having longitudinally spaced first and second ends, a plurality of sides between the first and second ends, and a plenum inside the housing. Each of the sides has an empty space framed by outer edges of the housing side. A fan is mounted to the housing and is operably disposed, preferably, within the plenum to draw air from the plenum and to exhaust the air outside of the housing. Filter panels are mounted on the sides. Each of the panels is removably attached to outer surfaces of the edges and filter material is mounted in the panels to cover the empty spaces. Attachment devices are used to removably attach the filter panels to the sides and hold the filter panels against the outer surfaces of the edges. Magnets mounted on edges or the panels may be used as attachment devices as well as other devices for clipping the panels onto the outer surfaces of the edges of the housing. The filter material is preferably a self-charging electrostatic washable material.
The room filter apparatus of US '340 cleans air using a fan filter assembly through reduced static pressure having casing with multiple filters. This system is filter and material intensive, additionally - the filters will not reach their expected lifetime in such a system as the filter cake will nullify the reduced pressure drop of having multiple filters.
CN204511930 discloses a ceiling fan lamp that has the air purification function. The ceiling fan lamp discloses dustcoat, flabellum, LED lights board, lamp shade, at dustcoat internally mounted air purifier and pass through the indoor air flow and the circulation of rotatory drive of flabellum, said air purifier comprises the main casing that has a plurality of cavities, fixed mounting active carbon filter screen in one of them cavity, one of them inner chamber of said air purifier is equipped with sterile lamp, at the inside anion generator that is equipped with of air purifier.

This ceiling fan lamp with air purification function uses ionizers which produce toxic ozone as opposed to filters to purify air.
CN2564784 discloses a Ceiling fan with air purifier. CN '784 discusses that in order to purify the air, in some ceiling fans, a filter screen is added on blades for filtering dust in the air. Because of the limited filter range of the filter screen, the filter effect is not good. In the utility model, an air exhaust worm wheel is arranged above all the blades of the ceiling fan and the outside of a ceiling fan motor; the outside of the air exhaust worm wheel is provided with an outer cover with a dust filter screen, wherein, an electrostatic generator is arranged above the air exhaust worm wheel. When the ceiling fan works, the electrostatic generator can be simultaneously electrified .to work, an electrostatic field is generated around, the ceiling fan to absorb dust, etc. in the air so as to forcibly form air stream from top to bottom above he ceiling fan following the air exhaust worm wheel. When the dust, etc. in the air pass through the dust filter screen on the outer cover, and the dust, etc. in the air can be implemented with filtration, dust removal and deodorization by the dust filter screen so as to achieve the purpose of air purification.
This ceiling fan with air purifier uses ionizers which produce toxic ozone. It additionally adds an additional exhaust wheel which increases the cost of the air purifier and will be expensive.
US2002/006962 discloses an air filtering device which comprises an upper circular plate, the circular plate being adapted for fixed attachment to and rotation by the rotor plate of a common ceiling fan. Further, such ceiling fan having its blades removed. Thereafter, the upper circular plate of the air filtering device preferably extends conically upward, such upward extension terminating in a flattened circular upper end which is fitted for attachment to the rotor plate of the ceiling fan. Screw receiving filter attachment apertures are either drilled into or molded into the flattened upper end of the circular plate, such apertures being positioned and aligned so that they may underlie the fan blade attachment apertures of the ceiling fan's rotor plate. Also, a light fixture shaft aperture may be drilled or molded into such flattened open end. Such configuration of the upper circular plate and the filtering attachment apertures allows the air filtering device to

be easily and conveniently attached to the rotor plate by means of screws or bolts. The filter used is HEPA filters or impregnated with activated charcoal.
This system effectively repurposes a ceiling fans motor to convert it into a centrifugal fan. It is difficult to install, difficult to remove, and expensive to manufacture.
A need is felt for a more effective, economical, compact, improved detachable ceiling fan and air purifier duct system which can provide cool air as well as purify the impurities and pollutants in the room.
It is, therefore, an object of the present invention to provide a filter and ceiling fan assembly of the type described which is simple in structure and inexpensive to prepare, manufacture, and assemble. Also, the present improved detachable ceiling fan and air purifier duct system uses a relatively cheaper high sweep axial fan that produces substantial amount of velocity pressure to be concentrated with a dual converging cone to produce the present dual filtration technique.
These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
The present invention envisages an economical novel detachable ceiling fan and air purifier duct system. Further, the present invention overcomes the problems associated with the available ceiling fan and air purifier units which exists as a separate unit as well as which exists a same unit.
The present invention provides an effective, economical, compact, convenient, competent, novel detachable ceiling fan and air purifier duct system which can provide cool air as well as purify the impurities and pollutants in the room.
According to one embodiment of the invention, with the help of the novel detachable ceiling fan and air purifier duct system, the ceiling fan is converted into air purifier duct which is capable of

removing dust and pollutant and particularly PM1, PM 2.5, and PM 10, and noxious gases such as formaldehyde.
According to another embodiment of the invention, the novel detachable ceiling fan and air purifier duct system uses an economical high sweep axial fan that produces relatively little static pressure but significant amount of windflow (velocity pressure). The benefit of using a high-sweep axial fan stems from the ability to use Bernoulli's principle (the total pressure within a system stays constant) to convert static pressure to higher velocity through the use of a dual converging cone design. As the sweep of the fan is large, the duct opens only in the section where maximum velocity is reached which allows for efficient usage of the filters that are attached. .
According to another embodiment, the present invention uses a relatively cheaper high sweep axial fan that produces substantial amount of velocity pressure. The axial fan then does not seal the filter on the sides and allows the resisted air to escape through the sides. It then directs the escaped air to flow tangentially across the outlet side of the filter. By having significant tangential flow, the scalar static pressure (the pressure that would normally resist air flow) is decreased increasing the pressure differential between the inlet and outlet side of the filter. This allows the large sweep axial fan to allow air to flow through the filter.
By using the present dual sided filtration technique, the need to seal the filters has been removed which eliminates the cost of sealing of the filters and thus decreases the associated cost.
Other aspects, advantages, and salient features of the present invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. Reference will now be made to the accompanying diagrams which illustrate, by way of an example, and not by way of limitation, of one possible embodiment of the invention.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following drawings are illustrative of particular examples for enabling systems and methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Figure 1 is a schematic cross-sectional view of novel detachable ceiling fan and air purifier duct system in accordance with the preferred embodiment of the present invention. Figure 2 is a cross sectional view of honey comb filter present in the present invention.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity of the system. Further, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.
Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
DETAILED DESCRIPTION OF THE INVENTION
The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention in respect of which patent protection is being claimed. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, persons skilled in the art will recognize that various changes and modifications to the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
The terms and words used in the following description are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of

the invention. Accordingly, it should be apparent to the person skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purpose only.
It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise.
The present invention relates to an economical novel detachable ceiling fan and air purifier duct system which overcomes the problems associated with the available ceiling fan and air purifier units which exists as a separate unit as well as which exists a same unit. Further, the present invention provides an effective, economical, compact, convenient, competent, novel detachable ceiling fan and air purifier duct system which can provide cool air as well as purify the impurities and pollutants in the room.
The novel detachable ceiling fan and air purifier duct system is able to convert the ceiling fan into air purifier duct which is capable of removing dust and pollutant and particularly PM1, PM 2.5, and PM 10, and noxious gases such as formaldehyde. The novel detachable ceiling fan and air purifier duct system uses an economical high sweep axial fan that produces relatively little static pressure but significant amount of windflow (velocity pressure). The benefit of using a high-sweep axial fan stems from the ability to use Bernoulli's principle (the total pressure within a system stays constant) to convert static pressure to higher velocity in a height efficient manner through the use of dual converging cones and honeycomb laminizers. As the sweep of the fan is large, the duct opens only in the section where maximum velocity is reached which allows for efficient usage of the filters that are attached.
Figure 1 is a schematic cross-sectional view of novel detachable ceiling fan and air purifier duct system in accordance with the preferred embodiment of the present invention. The novel detachable ceiling fan and air purifier duct system (15) at the centre includes a hole to hold tbe Rod Shaft. The outer wall novel detachable ceiling fan and air purifier duct system (15) is present to collect the air spread by the ceiling fan. Next to the central hole and the outer wall side threads for Clamp are present. Then plurality of adjoining piece are present which connects the outer wall with the central hole and are designed to minimize bend and curve.

In the novel detachable ceiling fan and air purifier duct system (15),the air flows from the axial ceiling fan into air purifier duct system (15) which is held in place by the top bit (21). The air will then flows through the honey comb flow straighter (23) which results in straightened, less noisy flow of air. The straighten air then flows between the outer truncated cone (8) and inner truncated cone (9) which results in increased velocity of the air. This dual truncated cone structure is the novel dual converging cone design. This system maximizes velocity in an outlet annulus ring, minimizes turbulence due to uneven flow creation, and minimizes the height required to reduce area of coverage substantially. The air with increased velocity will then partially flow through the primary filter (29) and partially through the the holed separator (27) present between primary and secondary filter and then flows to a secondary filter (28) for tangential filtration and then finally to below the outlet side of the primary filter (29) for dual sided filtration. Thus, the novel dual sided filtration is performed using the air purifier duct system (15).
The present invention uses a relatively cheaper high sweep axial fan that produces substantial amount of velocity pressure that is captured in a small area. It then does not seal the filter on the sides and allows the air to escape through the sides. Therafter, it directs the escaped air to flow tangentially across the outlet side of the filter. By having significant tangential flow, the scalar static pressure (the pressure that would normally resist air flow) is decreased in favor of tangential velocity pressure. The pressure differential on the two sides of the filter are thus altered. On the inlet side, significant velocity pressure flows against the filter. On the outlet side, the filter has a tangential flow which reduces the static pressure that would normally resist filtration. Hence, the pressure differential is far higher than it would be compared to sealing the filter and this is what we have labeled as Dual Sided Filtration. Darcy's law states that the volume is filtered is proportional to the pressure differential between inlet and outlet side of the filter, hence the technique increases the volume of fluid that flows through the filters. Additionally, as the flow is perpendicular to the fan, an axial fan would face significant backflow from the filter side. By giving an area to escape, this backflow is significantly mitigated, which both lowers stress on the motor and increases velocity pressure. Additionally, filter cake which develops over time as the filter gets clogged increases the pressure drop of the filter - using this technique there is an attenuating impact of lower static pressure on the outlet side of the filter.

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Also significant cost is used making the filters sealable and by using the present dual filtration technique, the need to seal filters has been removed and so has the associated cost.
The present novel dual sided filtration method can be preformed in a high recirculation environment like an enclosed room. Using this dual sided filtration method in an Heating Ventilation and Air Conditiong Unit (HVAC) or in stream filtration would allow significant amounts of fluid to escape filtration. This isn't a concern with an enclosed environment's air as sooner or later it will be cleaned. Thus, the present invention provides dual sided filtration to overcome high resistance filters.
Figure 2 is a cross sectional view of honey comb flow straightner present in the present invention. The honeycomb flow straightner(2) is a conventional lightweight and strong flow straightner which has a relatively large surface area for its volume, and provides low resistance to air. The honey comb flow straightner lowers turbulence. The honeycomb flow straightner has a honeycomb structure as a base and inlet opening cells with surface layers formed on respective inner surfaces thereof.
The present invention functions as a powerful air purifier. A ceiling fan with an 800 RPM that has been given the invention has a CADR of 460 M3/Hour with a 250 PA Pressure Drop HEPA filter. The ceiling fan is also be fitted with a multitude of other devices like particulate matter sensors and LED displays. Additionally the honeycomb can be replace with an adsorptive material like activated carbon, and can be made to taper into the dual converging cone structure.
The accompanying drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
The figures and the description above provide details of one particular design which is also specific to the design and configuration of the improved detachable ceiling fan and air purifier duct system considered. It would be obvious to person skilled in the art that, based on the concepts, ideas and issues described herein, several variations of the proposed design for the

design and configuration of the base engine considered, as well as, for engines with distinctly different design and configuration, will be possible without deviating from the scope of this invention.
Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the invention. It is also to be understood that the description is intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between.
This patent pertains to the development of models like the one so described that is capable of converting a high-sweep axial fan into one capable of pushing air through a high resistance filter through the usage of dual converging cones or dual sided filtration.

We claim:
An economical novel detachable ceiling fan and air purifier duct system attached
to a ceiling fan that perform dual sided air filtration comprising:
an outer wall to collect air spread by the ceiling fan;
an inner wall to reflect the air collected from the outer wall;
a centre portion that includes a hole to perform the dual sided air filtration;
a clamp present next to the central hole and the outer wall side threads;
a plurality of truncated cones are present to increase velocity of the air; and
a plurality of filters are present below the truncated cones to filter the air.
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein the central hole holds a rod shaft.
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein plurality of adjoining piece are present to connect the outer wall with the central hole.
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein plurality of adjoining piece are designed to minimize bend and curve.
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein air from the outer wall flows through a honey comb flow straighten
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein outer and inner truncated cones are present to increase the velocity of the air.
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein a primary and a secondary filters are present below the outer and inner truncated cones to filter the air.

The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein a primary filter and a holed separator is present between primary and secondary filter to filter the air.
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein the secondary filter perform tangential filtration and the primary filter perform dual sided filtration.
The economical novel detachable ceiling fan and air purifier duct system attached to a ceiling fan that perform dual sided air filtration as claimed in claim 1, wherein Bernoulli's principle is used to convert static pressure to higher velocity.