FIELD OF INVENTION:

[001] The present subject matter described herein, relates to ceiling fan, and, in particular, to ceiling fan blade with an air disruptor to increase air delivery.
BACKGROUND AND PRIOR ART:
[002] Generally, ceiling fans are powered by electric motors for circulating air. The ceiling fan has a motor within housing, i.e., hub mounted to a down rod that rotates a plurality of fan blades connected with the motor about the axis of the down rod. Their blades have traditionally been flat and oriented at an incline or pitch to present an angle of attack to the air mass in which they rotate. This causes air to be driven downwardly.
[003] When a fan blade that extends generally radially from its axis of rotation is rotated, its tip end travels in a far longer path of travel than does its root end for any given time. Thus, its tip end travels much faster than its root end. To balance the load of wind resistance along the blades, and the air flow generated by their movement, fan blades have been designed with an angle of attack that diminishes towards the tip.
[004] The ceiling fan or axial fan is suspended above the ground, the ceiling fan sucks air radially. This means that the air flow is not fully perpendicular to the fan blades. Also, wind causes variations in the air flow direction relative to the fan blade. This variation in air flow direction relative to the fan blades causes a non optimal functioning of the fan. It is known to use twisted fan blades to optimize the aerodynamic angle of attack of the fan blade. However, due to wind and to other particular conditions that can create turbulence at the outboard edge of the blade, only twisting of the fan blade does not provide an optimal solution for the outboard edge zone of a fan blade. These conditions could cause such an air flow direction relative to the tip of the fan blade, that stall can occur in the outboard edge zone resulting in lower performance, lower efficiency of the fan blade and causing extra noise.
[005] Technical problem in the conventional fan blade is that high air pressure is developed at bottom surface and lower pressure at the top surface due to which the air from the bottom moves toward the top surface which creates a push at the tip air towards the rotor side and leads to less air delivery.
[006] Further, conventional ceiling fan blade made of plastic or metal has high blade weight decreases the overall efficiency of the ceiling fan.
[007] With the heavy ceiling fan blade, revolution per minute and wattage consumption of the ceiling fan is also high. Further, ceiling fan can not obtain peak velocity with heavy weight.
[008] In the existing technologies, several technologies were suggested to reduce the weight of the ceiling fan blade, such as plastic fan blade. In the plastic blades, strength of the fan blade is an important issue. If thickness and weight of the plastic blade is reduced, it has direct impact on the strength of the fan blade.
[009] Therefore, there is a need to develop a ceiling fan blade which has less thickness and less weight with necessary strength for the fan blade. It is known that pressure on the top and bottom surface of the fan blade plays an important role for the strength of the fan blade. Accordingly, the inventor of the present application provides a technical solution by understanding aerodynamics of the fan blade.
OBJECTS OF THE INVENTION:
[0010] The principal objective of the present invention is to provide a ceiling fan blade with at least one air disruptor.
[001] Another object of the present invention is to provide a ceiling fan blade with at least one air disruptor closer to tip end of the ceiling fan blade.
[002] Another object of the present invention is to provide a ceiling fan blade with at least one air disruptor closer to rotor end of the ceiling fan blade.
[0011] Another object of the present invention is to provide a ceiling fan blade with at least one air disruptor to reduce weight of the ceiling fan blade.
[0012] Another object of the present invention is to provide a ceiling fan blade with at least one air disruptor which provides strength to the ceiling fan blade.
[0013] Yet another object of present invention is to provide a ceiling fan blade with at least one air disruptor to restrict movement of air to increase air delivery.
[0014] Yet another object of the present invention is to provide a simple and cost-effective ceiling fan blade with reduced weight.
SUMMARY OF THE INVENTION:
[0015] The present subject matter relates to a ceiling fan blade with an air disruptor for higher air delivery and less weight. The present ceiling fan blade has a rotor end and a tip end. An integrated air disruptor is provided at a location in between the rotor end and the tip end. The air disruptor is integrally formed with the ceiling fan blade.
[0016] To further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0018] Fig. 1 illustrates ceiling fan blade with an air disruptor, in accordance with an embodiment of the present subject matter;
[0019] Fig. 2 illustrates top view of the ceiling fan blade with an air disruptor, in accordance with the present subject matter; and
[0020] Fig. 3 illustrates front portion of the ceiling fan blade illustrating position of the air disruptor, in accordance with an embodiment of the present subject matter.
[0021] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0022] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be constructed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0023] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0024] The ceiling fan are coupled with ceiling structures via hanging rods. Generally, a ceiling fan has a plurality of ceiling fan blades, a motor, hanging rod, and canopies. Further, as per latest developments, the ceiling fan can have lighting features along with winglet and twist profile. The ceiling fan blades has convex shape and concave shape profile at top surface and bottom surface, respectively. The aerodynamics and air delivery of the ceiling fan depends on the shape, structure and configuration of the ceiling fan blades. The plurality of ceiling fan blade is mounted on hub of the motor which is a rotor. The mounting can be done by screw. The plurality of ceiling fan blade is mounted in such a manner that is looks smooth circumference at the hub.
[0025] Fig. 1 illustrates ceiling fan blade with an air disruptor over top surface, in accordance with the present subject matter. The ceiling fan blade 100 (hereinafter it can be referred as fan blade 100) has a rotor end 101 and a tip end 102. The ceiling fan blade 100 is defined a body 103 longitudinally from the tip end 102 and the rotor end 101. The ceiling fan blade 100 has a leading edge 105 and a trailing edge 106 along longitudinal length of the body 103. The ceiling fan blade 100 has at least one air disruptor 104 at a location in between the rotor end 101 and the tip end 102.
[0026] In another embodiment of the present subject matter, the air disruptor 104 can be one or more than one over the ceiling fan blade100. The air disruptor 104 is provided over top surface of the ceiling fan blade 100. Referring to figure 2, the air disruptor 104 is provided across transverse width ‘w’ of the ceiling fan blade from the leading edge 105 to the trailing ledge 106. The air disruptor 104 extend vertically upward from upper/top surface of the ceiling fan blade 100. The air disruptor 104 has curved profile corresponding to curved profile of the top surface of the ceiling fan blade 100. The air disruptor 104 tapers down toward the leading edge 105 and the trailing edge 106 along transverse direction. The air disruptor 104 has more height at middle position of the leading edge 105 and the trailing edge 106 as compare to height at the leading edge 105 and the trailing edge 106.
[0027] The air disruptor 104 is formed integral with the ceiling fan blade 100 during molding process of the ceiling fan blade 100. The ceiling fan blade 100 is formed of compounded polymer. Accordingly, the air disruptor 104 is also formed of compounded polymer. Integral formation of the air disruptor 104 with the ceiling fan blade 100 is an important and novel formulation.
[0028] In an embodiment of the present subject matter, the location of the air disruptor 104 over the ceiling fan blade can be decided based on current air delivery data which shows how air velocity profile changes after a certain distance. Accordingly, the location of the air disruptor 104 over the ceiling fan blade 100 vary from kind of blades. For instance, the air disruptor 104 can be positioned closer to the tip end 102 of the ceiling fan blade 100. In another instance, the air disruptor 104 can be positioned closer to rotor end 101. In yet another instance, the air disruptor 104 can be positioned in middle of the rotor end 101 and the tip end 102. The location of the air disruptor 104 is not fixed it can vary based on air delivery data which can be analyzed after testing the same and finding the weak location over the ceiling fan blade.
[0029] In an embodiment of the present subject matter, the number of air disruptor 104 is also depend on length of the ceiling fan blade 100 and air delivery data. Accordingly, on the ceiling fan blade 100, one or more than one air disruptor can be provided to interrupting slippage of air along the length or longitudinal axis of the fan blade and redirecting the air flow to a direction perpendicular to the longitudinal axis of the fan blade.
[0030] The present ceiling fan blade 100 with at least one integrated air disruptor 100 provides following advantages to the current plastic ceiling fan blades.
1 Air Delivery 10-15% improvement
2 Blade Weight reduced as air disruptor act as a rib which will help reducing blade thickness
3 RPM higher due to point no 2
4 Wattage lower due to point no 2
5 Service value Higher
6 Spread More (increased Air Delivery)
7 Peak Velocity Higher

[0031] Due to the air disruptor air delivery increases because air travels over the fan blade. There is a velocity difference between the top surface and the bottom surface air which results in pressure difference on both surfaces (Bernoulli’s principle). Because of the higher pressure on the bottom surface and lower pressure on the top surface, the air from the bottom surface move towards the top surface due to which there is push of tip air towards the rotor end and slippage of air over the top surface. With the air disruptor 104 on the top surface at optimized location, the air disruptor 104 act as a barrier to stop movement of the air from the tip end to the rotor end and avoid slippage of the air over the top surface.
[0032] Blade weight: the present ceiling fan blade 100 has reduced weight in comparison to existing plastic ceiling fan blades. The ceiling fan blade 100 has reducing thickness as the air disruptor 104 act as a rib to provide strength. The air disruptor 104 restrict flutter movement of the blade due to rotation which is there in the metal blades. By providing the air disruptor integrally, the continuous stress development in the ceiling fan blade breaks and flutter movement is also avoided even with less thickness.
[0033] Peak velocity: By providing integral air disruptor 104 over the top surface of the ceiling fan blade, the velocity profile improves (more uniform) over the blade surface which increases the tip velocity. Having air disruptor at each blade of the ceiling fan at same location, the ceiling fan has uniform velocity profile over the blade surface hence more peak velocity.
[0034] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
[0035] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present invention contemplates all these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.
[0036] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

We claim:

1. A ceiling fan blade (100) for high air delivery in ceiling fan, the ceiling fan blade (100) comprising:
a rotor end (101) provided at one end to connect with rotor of the ceiling fan;
a tip end (102) at distal end of the ceiling fan blade (100);
a leading edge (105) and a trailing edge (106) is defined along longitudinal length of the ceiling fan blade (100) from the rotor end (101) to the tip end (102);
characterized in that
at least one integrated air disruptor (104) is provided over the ceiling fan blade (100) at a location in between the rotor end (101) and the tip end (102).
2. The ceiling fan blade (100) as claimed in claim 1, wherein the at least one air disruptor (104) is provided across transverse width of the ceiling fan blade (100) from the leading edge (105) to the trailing edge (106).
3. The ceiling fan blade (100) as claimed in claim 1, wherein the at least one air disruptor (104) extends vertically upward from upper surface of the ceiling fan blade (100).
4. The ceiling fan blade (100) as claimed in claim 1, wherein the at least one air disruptor (104) taper down toward the leading edge (105) and the trailing edge (106).
5. The ceiling fan blade (101) as claimed in claim 1, wherein vertical height of the at least one air disruptor (104) is higher at middle of the leading edge (105) and the trailing edge (106) than at the leading edge (105) and the trailing edge (106).
6. The ceiling fan blade (100) as claimed in claim 1, wherein the at least one air disruptor (104) is formed integral with the ceiling fan blade (100).
7. The ceiling fan blade (100) as claimed in claim 1, wherein the at least one air disruptor (104) is positioned closer to the tip end (102).
8. The ceiling fan blade (100) as claimed in claim 1, wherein the at least one air disruptor (104) is positioned closer to the rotor end (101).
9. The ceiling fan blade (100) as claimed in claim 1, wherein the at least one air disruptor (104) is provided at top surface of the ceiling fan blade (100).
10. The ceiling fan blade (100) as claimed in claim 1, wherein position of the at least one air disruptor (104) decided upon air delivery data of the ceiling fan blade (100).
11. The ceiling fan blade (100) as claimed in claim 1, wherein the ceiling fan blade (100) is formed of compounded polymer.