MX2007000821A

MX2007000821A - Fan blades and modifications.

Info

Publication number: MX2007000821A
Application number: MX2007000821A
Authority: MX
Inventors: Richard Michael Aynsley
Original assignee: Delta T Corp
Priority date: 2004-07-21
Filing date: 2005-01-28
Publication date: 2007-09-11
Also published as: CA2574762C; SG139757A1; CN101099028B; JP2011236914A; RU2353817C2; EG24639A; CN101608640B; NZ578817A; KR101297469B1; AU2010214764A1; CR8933A; AU2010214764B2; IL180822A; KR101320805B1; CA2574762A1; RU2008144966A; WO2006022812A1; IL180822A0; JP4987147B2; NO20070961L

Abstract

A winglet includes a vertical member and a mounting member. The mounting memberis configured to facilitate the mounting of the winglet to the tip of a fan blade.The vertical member is configured to extend perpendicularly relative the tipof a fan blade. Adding winglets to fan blades may improve the aerodynamics of thefan blades, and thereby increase efficiencies of a fan.

Description

PALETAS PE FAN AND MODIFICATIONS Priority Data This application claims priority of the description of United States Provisional Patent Application No. 60 / 589,945, entitled "FAN PALETTS AND MODIFICATIONS", filed on July 21, 2004.

Field of the Invention The present invention relates in general to fan blades and fan blade modifications, and is directed in particular to an aerodynamic section suitable for use with a fan blade and a fin suitable for use with a fan blade.

Background of the Invention People who work in large structures such as warehouses and manufacturing plants are exposed to working conditions that can range from uncomfortable to dangerous. The same applies in agricultural environments, such as a structure with animals. On a hot day, the indoor air temperature reaches a point where a person or an animal can not maintain a healthy or desirable body temperature. In areas where the temperature is uncomfortable or highly unsafe, it may be desirable to have a device that operates to create an improved air flow within the area. Such flow of partly air, can facilitate the reduction of the temperature in the area. In addition, certain activities that occur in these environments, such as welding or the operation of internal combustion engines, can create atmospheric pollutants that can be harmful to beings. The effects of air pollutants can be magnified when the air flow in the area is less than ideal. In these situations and in similar situations, it may be desirable to have a device that operates to create or improve the air flow within the area. Such air flow, in part, can facilitate the reduction of the harmful effects of contaminants, such as through the dilution and / or removal of contaminants. In certain structures or environments, problems may arise with heat collection and its remaining near the roof of the structure. This can be worrisome when the area near the floor of the structure is relatively cooler. Those skilled in the art will be able to recognize the disadvantages that arise from having this distribution or other unbalanced distribution of air / temperature. In these situations and in similar situations, it may be desirable to have a device that operates to create or improve the air flow within the area. Such air flow, in part, can facilitate de-stratification and induction of more ideal air / temperature distribution.

Brief Description of the Invention It is also desirable to have a fan with the ability to reduce energy consumption. Such reduction in energy consumption It can be done by having a fan that runs efficiently (for example, that requires less energy to activate the fan compared to other fans). The reduction in energy consumption can also be made by having a fan that improves air distribution, which reduces the heating or cooling costs associated with other devices.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings incorporate or form part of the specification illustrate various aspects of the present invention and together with the description serve to explain the principles of the invention, however, it should be understood that this invention is not limited to specific arrangements. In the drawings, the reference numbers refer to the same elements in the different views. In the drawings: Figure 1 is a plan view of a hub for mounting the fan blades. Figure 2 is a cross-sectional view of an aerodynamic section of the exemplary fan blade. Figure 3 is a cross-sectional view of an alternative, exemplary fan blade aerodynamic section. Figure 4 illustrates a graph showing two ellipses. Figure 5 illustrates a portion of the graph of Figure 4. Figure 6 is a side view of an exemplary fin fan blade modification. Figure 7 is a cross-sectional view of the fin of the Figure 6. Figure 8 is a top view of the flap of Figure 6. Figure 9 is an end view of the fan blade of Figure 2, modified with the flap of Figure 6. Figure 10 is a perspective, exploded view of a fin-vane assembly of Figure 9. Reference is now made in more detail to the preferred embodiment of the invention, the example of which is illustrated in the accompanying drawings.

Detailed Description of the Invention Reference is now made to the drawings in detail, wherein the identical reference numbers indicate the same elements through the different views. Figure 1 shows an exemplary fan hub 10, which can be used to provide a fan having fan blades 30 or 50. In the present example, a fan hub 10 includes a plurality of hub mounting elements 12, to which the fan blades 30 or 50 can be mounted. In one embodiment, the fan hub 1 0 is coupled with a drive mechanism for rotating the fan hub 10 at selectable or predetermined speeds. A suitable hub assembly may comprise the hub 10 and a drive mechanism coupled with the hub 10. Of course, the hub assembly may include a variety of other elements, including a different hub, and the hub 10 of the hub. Fan can be operated by any appropriate means. In addition, the hub 10 of the fan can have any number of 12 assembly elements of the cube. As shown in Figures 1 through 3, each hub mounting element 12 has an upper surface 14 and a lower surface 16, which terminate at a leading edge 18 and a trailing edge 20. In addition, each hub mounting element 12 includes an opening 22 formed through the upper surface 14 and extending to the lower surface 16. In the present example, the opening 22 has the dimensions to receive a fastener 26. Each hub mounting element 12 is configured to receive the vane 30 or 50 of the fan. Those skilled in the art will appreciate that the hub mounting elements 12 can be provided in a variety of alternative configurations. In one embodiment, the fan blades 30 or 50 are mounted in the hub assembly set forth in U.S. Patent No. 6,244,821. By. Of course, fan blades 30 or 50 can be mounted in any other hub and / or hub assembly. A suitable hub assembly can operate to rotate the hub 10 at any appropriate angular velocity. As an example only, any angular velocity may be within the range of about 7 to 108 revolutions per minute. Figure 2 shows a cross section of an exemplary fan blade 30 having a curved rear edge 38 mounted on the hub 10. The cross section is taken along the transverse plane located at the center of the fan blade 30, seen towards the hub 10. The vane 30 of the fan has an upper surface 32 and a surface 34 below, each one ends in a leading edge 36 and a trailing edge 38. As shown, the trailing edge 38 has an inclination of approximately 45 ° relative to the portion of the upper surface 32 that is near the trailing edge 38 and a portion of the lower surface 34 is close to the trailing edge 38. Of course, the trailing edge 38 may have any other suitable inclination, such as by way of example only, to the extent that it comprises a single planar surface. Those skilled in the art will be able to contemplate other appropriate configurations for the trailing edge 38. In the present example, the fan blade 30 is essentially hollow. A plurality of ribs or projections 40 are located within the vane 30 of the fan. As shown, when the hub mounting element 12 is inserted into the fan blade 30, the ribs or projections are placed in such a way that they make contact with the upper surface 14, the lower surface 16, the leading edge 18 and the rear edge 20 of the hub mounting element 12. The projections 40 thus provide a snap fit between the fan blade 30 and the hub mounting element 12. Alternative configurations for the fan blade 30, include but are not limited to those that effect the relationship between the fan blade 30 and the hub mounting element 12, as will be apparent to those skilled in the art. As used herein, terms such as "rope", "rope length", maximum thickness ", maximum sag", "angle of attack" and their like should be used with the same employee in the technique of the design of aircraft wings or aerodynamic sections. In one embodiment, the blade 30 of the fan has a cord length of approximately 16.35 cm. The vane 30 of the fan has a maximum thickness of about 16.2% of the rope and a maximum sag of about 12.7% of the rope. The radius of the leading edge 36 is approximately 3.9% of the cord. The dial radius of the trailing edge 38 of the lower surface 34 is approximately 6.8% of the rope. In an alternative embodiment, the blade 30 of the fan has a rope of approximately 17.78 cm. In another embodiment, the blade 30 of the fan has a cord of approximately 16.98 cm. Of course other dimensions and / or proportions may be used. As an example only, fan blade 30 may have lift-to-drag ratios ranging from about 39.8 under conditions where the Reynolds Number is about 120,000 to about 93.3, where the Reynolds Number is about 250,000. Of course, other drag relationships can be obtained with fan blade 30. In one embodiment, the fan blade 30 displays drag coefficients ranging from about 0.027 under conditions where the Reynolds Number is about 75,000 to about 0.127, where the Reynolds Number is about 1 12,500. Of course, other coefficients can be obtained with the blade 30 of the fan. In one example, under conditions where the Reynolds Number is approximately 200,000, the fan blade 30 moves air in a manner that there is a speed ratio of approximately 1.6 on the lower surface 34 at the rear edge 38 of the fan blade 30. Other speed relationships can be obtained with the fan blade 30. In one embodiment, the vane 30 of the fan provides aerodynamics without detachment for the attack angles between approximately -1 and 7o, under conditions where the Reynolds Number is approximately 112,000; and angles of attack between approximately -2 ° to 10 °, where the Reynolds Number is approximately 250,000. Of course, these values are merely exemplary. Figure 3 shows a cross section of another vane 50 of the fan having a generally elliptical upper surface 52 and a lower surface 54, each of which terminates at a leading edge 56 and a trailing edge 58, mounted on the hub 10 The cross section is taken along the transverse plane located at the center of the vane 50 of the fan, viewed towards the hub 10. In the present example, the vane 50 of the fan is hollow. A plurality of projections 60 are located within the vane 50 of the fan. As shown, when the mounting element 12 of the hub is inserted into the vane 50 of the fan, the projections 60 are positioned so as to make contact with the upper surface 14, the lower surface 16, the leading edge 18 and the edge 20 rear of the hub mounting element 12. The projections 60 thus provide a snap fit between the blade 50 of the fan and the hub mounting element 12. The configurations Alternatives for the vane 50 of the fan, include without limitation, those that effect the relationship between the vane 50 of the fan and the mounting element 12 of the hub, as will be appreciated by persons skilled in the art. As shown, the vane 50 of the fan has a lower radius of curvature towards its front edge 56, compared to a higher radius of curvature towards its rear edge 58. The curvatures of the vane 50 of the fan can be obtained, at least in part, by generating two ellipses with the use of the following formulas. Those skilled in the art will recognize that a first ellipse, with its origin at the intersection of the "x" and "y" Cartesian axes, can be generated by these equations: (1) x = a (COS (t)); and (2) y = b (SIN (t)); where: a = length of the primary radius; b = length of the secondary radius; and t = angle of rotation of a radius around the origin (for example, in radians). In accordance with this, a first ellipse can be generated with the use of the above equations. Similarly, a group of coordinates for the first ellipse can be obtained with the use of equations (1) and (2). The first exemplary ellipse 200 is illustrated in the graph illustrated in Figure 4, where a = 3 and b = 2. The coordinates for a second ellipse can be obtained with the use of the following equations: (3) x2 = x (COS (?)) - y (SIN (T)); and (4) y2 = y (COS (?)) - x (SIN (?)); where: x2 = the second coordinate "x" after a rotation to the left of the first ellipse through the radians? around the origin; and y2 = the second coordinate "y" after a rotation to the left of the first ellipse through? radians around the origin. In this way, the dimensions of the second ellipse depend on the dimensions of the first ellipse. The second exemplary ellipse 300 is illustrated on the graph illustrated in Figure 4, where? = 0.525 radians. It should be appreciated that, when the first and second ellipses are plotted in accordance with equations (1) through (4), the two ellipses can intersect at four points ("ellipse intersections"). Figure 4 shows four intersections 400 of ellipse between the first ellipse 200 and the second ellipse 300. The curvature of the upper surface 52 and the lower surface 54 may be based, at least in part, on the curvature of the first and second ellipse. second ellipses, between two consecutive ellipse intersections. An example of such a segment of the first ellipse 200 and the second ellipse 300 is shown in Figure 5, which shows the portion of the ellipses (200 and 300) between the consecutive ellipse intersections 400. In accordance with this, equations (1) through (4) can be used to generate surface coordinates for at least a portion of the upper surface 52 and the lower surface 54 of the fan blade. It should be appreciated that the length-to-thickness ratio of the vane rope 50 of the fan may vary with the amount of rotation,,, relative to the two ellipses. Of course, the portions of the vane 50 of the fan can deviate from the curvature of the first and second ellipses. As an example only, and as shown in Figure 3, the leading edge 56 can be modified to have a generally circular curvature. Those skilled in the art will be able to recognize other deviations. In one embodiment, the fan blade 50 is created with the use of equations (1) to (4), with a = 3 units, b = 2 units and? = 0.525 radians. In this embodiment, the vane 50 of the fan is adjusted with the circular leading edge 56 having a diameter of 3.5% of rope length. The curvature of the leading edge 56 fits tangentially to that of the upper surface 52 and that of the lower surface 54. Such an adjustment can be observed when comparing Figures 3 and 5. Of course, other dimensions can be used. In one embodiment, the vane 50 of the fan has a cord length of approximately 1 9.48 cm. In another embodiment, the fan blade has a rope length of approximately 1 9.52 cm. Of course, the blade 50 of the fan can have any appropriate length of rope. In the present example, the radius of the leading edge 56 is of approximately 3.5% of the rope. The maximum thickness of the blade 50 of the fan is approximately 14.2% of the rope. The maximum sag of the fan blade 50 is approximately 15.6% of the rope. Of course, other dimensions and / or proportions may be used. In one example, a fan having a diameter of 7.2 m and comprising ten blades 50 of the fan mounted at an angle of attack of 25.40 cm produces a pushing force of approximately 2.34 kg, when it rotates at approximately 7 revolutions per minute (rpm), which displaces approximately 26.21 cubic meters per minute (cfm = cubic feet per minute). When it rotates at approximately 14 rpm, the fan produces a pushing force of approximately 4.73 kg, which displaces approximately 37.25 cubic meters per minute. When it rotates at approximately 42 rpm, the fan produces a pushing force of approximately 31.95 kg, which displaces approximately 96.78 cubic meters per minute. Other pushing forces and / or displacement volumes can be obtained with a fan having vanes 50 of the fan. As an example only, a blade 50 of the fan having an angle of attack of about 10 ° may have lift-to-drag ratios ranging from about 39, under conditions where the Reynolds Number is about 120,000, to about 60, where the Reynolds Number is approximately 250,000. Other lift-to-drag relationships can be obtained with fan blade 50.

In one embodiment, the blade 50 of the fan provides aerodynamics without detachment for the angles of attack between about 1 ° and 1 1 °, under conditions where the Reynolds Number is about 1 12,000; and angles of attack between about 0 ° to 13 °, where the Reynolds Number is about 200,000 and for attack angles between about 1 ° and 13 °, where the Reynolds Number is about 250,000. Of course, these values are merely exemplary. In one example, a fan having a diameter of 42 m and comprising ten vanes 50 of the fan and rotating at approximately 25 rpm. The fan runs at approximately 54 watts, with a torque of approximately 200 cm-kg (cm.kg) and a flow rate of approximately 10.25 cubic meters per minute. The fan has an effectiveness of approximately 189.82 m3pm / Watt. In one example, a fan having a diameter of 42 m and comprising ten vanes 50 of the fan and rotating at approximately 37.5 rpm. The fan runs at approximately 82 watts, with a torque of approximately 47.63 meters-kg (m.kg) and a flow rate of approximately 1.872 cubic meters per minute. The fan has an effectiveness of approximately 228.36 m3pm / Watt. In another example, a fan having a diameter of 42 m and comprising ten blades 50 of the fan is rotated at approximately 50 rpm. The fan runs at approximately 263 watts, with a torque of approximately 956 cm-kg (cm-kg) and a flow velocity of approximately 29.04 m3pm. The fan has an effectiveness of approximately 1 10.43 m3pm / Watt. The following can be applied in any fan blade, as an example only, in a fan blade 30 or fan blade 50. In one embodiment, each blade 30 or 50 of the fan comprises a continuous transition zone of homogeneous material. As an example only, the blades 30 or 50 of the fan can be constructed of extruded aluminum. However, it will be appreciated that the vanes 30 and / or 50 can be constructed of any suitable material or materials, including, but not limited to, metal and / or plastic. Furthermore, it can be appreciated that the vanes 30 and / or 50 of the fan can be manufactured by any manufacturing method, including, but not limited to, stamping, bending, welding and / or molding. Other appropriate materials and methods of manufacture will be apparent to those skilled in the art. When the vane 30 or 50 of the fan is mounted in the hub 10, the hub mounting elements 12 can extend within the vane 30 or 50 of the fan, approximately to 15.24 cm, as an example only. Alternatively, the hub mounting elements 12 can be extended within the fan blade 30 or 50 to any suitable length. It should also be appreciated that the hub 10 may have mounting elements 12 that fit on the outer side of the fan blades 30 or 50, better than on the inside. Alternatively, the mounting elements 12 can be adjusted, both partially within and partially outside the fan blades 30 or 50. The blade 30 or 50 of the fan may also include one or more openings configured to align with the openings 22 in the hub mounting element 1 2. In this embodiment, when the openings in the vane 30 or 50 of the fan align with the openings 22 in the hub mounting element 12, a fastener 26 can be inserted through the openings to secure the vane 30 or 50 of the fan with the assembly element 1 2 of the hub. In one embodiment, the fastener 26 is a bolt. Other suitable accessories for the fastener 26 will be apparent to those skilled in the art, including, without limiting adhesives. Accordingly, it will be understood that the openings 22 are optional. The blade 30 or 50 of the fan can be approximately 1 .2, 1 .5, 1 .8, 2.1, 2.4, 2.7, 3.0, 3.3, 3.6, 3.9 or 4.2 meters long. Alternatively, the vane 30 or 50 of the fan may have another appropriate length. In one embodiment, the blade 30 or 50 of the fan and the hub 10 have the appropriate dimensions, so that a fan comprising vanes 30 or 50 of the fan and the hub 1 0 has a diameter of about 7.2 meters. In another embodiment, the blade 30 or 50 of the fan and the hub 10 have the appropriate dimensions, so that a fan comprising the blades 40 or 50 of the fan and the hub 10 has a diameter of about 4.2 meters. Those skilled in the art will be able to recognize other appropriate dimensions. As you can see, all the cross sections throughout The length of the fan blade 30 or 50 does not need to be identical. In other words, the configuration of fan blade 30 or 50 need not be uniform along the entire length of fan blade 30 or 50. As an example only, a portion of the "mounting end" of the vane bucket 30 or 50 of the fan (i.e., the end of vane 30 or 50 of the fan that will be mounted in hub 1 0) will be removed. In one example, an oblique cut is made in the front edge 56 of the vane 50 of the fan to accommodate another vane 50 in the hub 10. Alternatively, the vane 30 or 50 of the fan can be formed or constructed in such a way that an portion of the mounting end of the hub or other portion is omitted, released or "missing". It should be appreciated that the absence of such a portion (without considering whether it was removed or never existed) can solve the problems associated with the paddles 30 or 50, which interfere with each other in the hub 10. Such interference can be caused by a variety of factors , among which are counted but not limited, the rope length of the blades 30 or 50 of the fan. Of course, factors other than interference can influence the removal or absence of a portion of fan blade 30 or 50. The absent portion may comprise a portion of the leading edge 36 or 56, a portion of the trailing edge 38 or 58, or both. Alternatively, to direct the palette interference 30 or 50 of the fan in the hub 10, the diameter of the hub can be increased (for example, without increasing the number of hub mounting elements 12). Alternatively, the rope of the paddles 30 or 50 of Fan can be reduced. Other alternatives and variations of the hub 10 and / or blades 30 or 50 of the fan will be apparent to those skilled in the art. Those skilled in the art will appreciate that fan blade 30 or 50 can have a zero or non-zero angle of attack. As an example only, when mounted on the hub mounting element 12, the vane 30 or 50 of the fan can have an angle of attack within the range of about -1 ° to 7 °, inclusive, between -2 ° and 10 ° , inclusive or approximately 7 °, 8 °, 10 ° or 13 °, as an example. Of course, blade 30 or 50 of the fan can have any appropriate angle of attack. The vane 30 or 50 of the fan can be essentially straight along its length, and the angle of attack can be provided by having the hub mounting element 12 with the desired angle of attack. Alternatively, the angle of attack of the hub mounting element 12 may be zero and the angle of attack for a blade 30 or 50 of the fan may be provided by a twist in the blade 30 or 50. In other words, the blade 30 or 50 of the fan can be essentially straight along the length to which the hub mounting element 12 extends on a fan blade 30 or 50, and a twist can be provided to provide an angle of attack in the fan. remaining portion of fan blade 30 or 50. Such a torsion can occur over any suitable length of fan blade 30 or 50 (for example, the total length of fan blade 30 or 50 has a twist, or the torsion is short, so that almost all the rest of the palette 30 or 50 is essentially straight, etc.). Other suitable configurations and methods for providing an angle of attack for all or part of the pallet 30 will be apparent to those skilled in the art. In addition, it will be appreciated that all or any portion of the blade 30 or 50 of the fan may have one or more twists for any purpose. Those skilled in the art will appreciate that a fan blade 30 or 50 can be modified in several ways. Such modifications may alter the operating characteristics of the fan. As illustrated in the exemplary form in Figures 6 through 10, such modification may include a flap 70. While the flaps 70 will be described in the context of the blades 30 and 50 of the fan, it should be appreciated that the flaps 70 can be used with any suitable fan blade. The flap 70 of the present example includes a vertical element 72. The vertical element 72 comprises a flat internal surface 74 and a round surface 76. Those skilled in the art will be able to recognize other appropriate configurations for the inner surface 74 and for the outer surface 76. In the present example, the perimeter of the vertical element 72 is defined by the lower edge 78, the upper edge 80 and the rear edge 82. Each edge 78, 80 and 82 generally coincides at a respective corner 84. Thus, in the present example, the vertical element 72 has three corners 84. As shown, each corner 84 is round. In accordance with this, the term "corner" as used herein, should not be understood as requiring an acute angle.

In other words, a corner need not be limited to a point or region where a pair of straight lines are reached or intersected. While in the present example, the vertical element 72 is described with three corners, it will be appreciated that the vertical element 72 can have any number of appropriate corners 84. Other variations of the vertical element 72 will be apparent to those skilled in the art. The fin 70 of the present example also includes a fin mounting element 90, which extends essentially perpendicular to the inner surface 74 of the vertical element 72. As shown, the wing mounting element 90 is configured similar to the hub mounting element 12. The fin mounting element 90 has an upper surface 92 and a lower surface 94, each terminating at a leading edge 96 and a trailing edge 98. In addition, each fin mounting element 92 includes openings 100 formed through the upper surface 92 and the lower surface 94. In the present example, each opening 100 has the appropriate dimensions to receive a fastener 26. The fin assembly member 90 is configured to be inserted into one end of the fan blade 30 or 50. Those skilled in the art will appreciate that the fin assembly elements 90 can be provided in a variety of alternative configurations. Figure 9 shows a cross section of the vane 20 of the fan with the vane 70 mounted therein. The cross section is taken along the transverse plane located at the center of the pallet 30 of the fan, seen towards flap 70 (ie, away from hub 10). In the present example, and as shown in Figures 9 and 10, the fin assembly member 90 is configured to fit in. the end of the fan blade 30 or 50. Like the hub mounting element 12, the fin mounting element 90 is pressed against the projections 40 or 60 on the fan blade 30 or 50. In the present example, the upper edge 80 of the flap 70 extends over the upper surface 32 or 52 of the fan blade 30 or 50, in addition to extending beyond the leading edge 36 or 56. Similarly, the lower edge 78 of the vane 70 extends below the lower surface 34 or 54 of the vane 30 or 50 of the fan. The trailing edge 82 of the flap 70 extends beyond the trailing edge 38 or 58 of the fan blade 30 or 50. Of course, the vanes 70 and vanes 30 or 50 of the fan can have other sizes and / or alternative configurations. The vane 30 or 50 of the fan can have one or more openings, formed near the tip of the vane 30 or 50 of the fan through the upper surface 32 or 52 and / or the lower surface 34 or 54, which are placed to align with the opening 100 in the wing mounting element 90, when the wing mounting element 90 is inserted inside the fan blade 30 or 50, and having the measures to receive a fastener 26. The fins 70 may thus be secured with the fan blades 30 or 50 with one or more fasteners 26. In one embodiment, the fastener 26 is a bolt. In another embodiment, the fastener 26 comprises a complementary pair of interleaved connecting screws with thin heads, such as screw posts, occasionally used for joining a large volume of paper (eg, a "male" screw having an external surface with threads configured to match a "female" screw having an internal surface with threads). However, any appropriate fastener, including but not limited to adhesives, can be used. Accordingly, it can be seen that the openings 100 are optional. It should also be appreciated that the fin assembly element 90 need not be inserted into one end of the blade 30 or 50. In other words, and similar to the mounting elements 12 of the hub, the flange mounting element 90 can be formed to press fit on the outside of the fan blades 30 or 50, better than on the inside. Alternatively, the fin mounting elements 90 may be partially adjusted in and partially out of the fan blades 30 or 50. Those skilled in the art will appreciate other configurations. In an alternative embodiment, the flap 70 lacks the mounting element 90 and instead has a recess formed in the inner surface 74 of the vertical element 72. In this embodiment, the tip of the vane 30 or 50 of the fan is inserted inside the vane 70 for the coupling of the vane 70 with the vane 30 or 50 of the fan. In another embodiment, the vane 30 or 50 of the fan is formed integrally with the vane 70. Accordingly, persons skilled in the art will appreciate that there is a variety of configurations to provide a vane 30 or 50 of the vane fan 70. While the vertical element 72 is shown as being essentially perpendicular to the mounting element 90, it will be appreciated that these two elements can have any appropriate angle one with respect to the other. In this way and as an example only, the vertical element 72 can be tilted inwardly or outwardly when the vane 70 engages with the vane 30 or 50 of the fan. Alternatively, the vertical element 72 may comprise more than one angle. In other words, the vertical element 72 can be configured so that each of the upper portion of the vertical element and the lower portion of the vertical element is tilted inwardly when the vane engages the vane 30 or 50 of the fan. Those skilled in the art will be able to recognize other variations of flap 70, including angular variations, without being limited thereto. While the fin 70 is specifically described herein as a modification for the blades 30 or 50 of the fan, it should be appreciated that the fin 70 can be used to modify any other fan blade. In one embodiment, the flap 70 is formed of a molded plastic of homogeneous continuous cross section. However, it should be appreciated that flap 70 may be made of a variety of materials, including and not limited to metal and / or plastic and may comprise a plurality of pieces. In addition, it should be appreciated that the fin can be manufactured by any suitable manufacturing method. It should also be appreciated that the rear vortices formed at or near the tips of the vanes 30 or 50 of the fan can increase their elevation near the tips of the vanes 30 or 50 of the vane. fan. The fins 70 can prevent the flow of radial air over the upper surface 32 or 52 and / or the lower surface 34 or 54 near the tips of the vanes 30 or 50. Such inhibition can force the air to flow more normally from the edge 36 or 56 forward to the rear edge 38 or 58, which improves the efficiency of a fan having vanes 30 or 50 of the finned fan 70, at least at certain rotation speeds. In one example, the vanes 70 engage the ends of the vanes 30 or 50 of the fan in a fan that is 1.8 meters in diameter. With the addition of the fins 70, the air flow rate is increased by 4.4% at 171 rpm. In another example, the fins 70 engage the ends of the fan blades 30 or 50 in a fan that is 4.2 meters in diameter. With the addition of the fins 70, the air flow rate is increased by 4.4% at 75 rpm. The following two tables illustrate the effectiveness characteristic that can be obtained by adding the fins 70 to a fan that is 4.2 meters in diameter.

TABLE 1 Fan without fin TABLE 1 Fan with fin Of course, other values can be achieved with the use of the fins 70. In addition, appropriate variations of the fins, including but not limited to alternative configurations of the fin, will be apparent to those skilled in the art. In summary, many benefits have been described that result from employ the concepts of the invention. The above description of one or more embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the exact forms described herein. It can be seen that other modifications and variations are possible in the light of the previous teachings. One or more modalities were selected and described in order to better illustrate the principles of the invention and their practical application, thus enabling those skilled in the art to better utilize the invention in various embodiments and with various modifications that are appropriate for the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended thereto.

Claims

CLAIMS 1 . A fin for a vane of a fan, characterized in that it comprises: (a) a vertical element; and (b) a mounting element, wherein at least a portion of the mounting element is essentially perpendicular to at least a portion of the vertical element, wherein the mounting element is configured to be mounted at a first end of the vane. of the fan, wherein the fan blade is configured to be mounted in a fan hub at a second end of the fan blade, the second end is opposite the first end. 2. The modification for a fan blade according to claim 1, characterized in that the vertical element comprises a round external surface. 3. The modification for a fan blade according to claim 2, characterized in that the vertical element also comprises an essentially flat internal surface. 4. The modification for a fan blade according to claim 1, characterized in that the vertical element comprises a perimeter defined by the lower edge, an upper edge and a trailing edge. 5. The modification for a fan blade according to claim 4, characterized in that each of the edges it usually coincides in a respective corner. 6. The modification for a fan blade according to claim 5, characterized in that each of the corners is generally round. 7. The modification for a fan blade according to claim 1, characterized in that at least a portion of the mounting element is configured to fit within the first end of the fan blade. 8. Modification for a compliance fan blade I with claim 1, characterized in that the vertical element is configured to prevent the flow of radial air over at least a portion of the fan blade close to the first end of the fan blade. 9. The modification for a fan blade according to claim 1, characterized in that the mounting element comprises an internal surface, wherein at least a portion of the internal surface is at an angle not perpendicular to the mounting element. . 10. The modification for a fan blade according to claim 1, characterized in that the mounting element is configured to be essentially fixed with the first end of the fan blade by one or more fasteners. 1. The modification for a fan blade according to claim 1, characterized in that the vertical element has an upper edge, wherein the mounting element has an edge front, wherein when mounted at a first end of the fan blade having a leading edge, the distance from the leading edge of the mounting element to a point at the upper edge of the vertical element is greater than the distance from the edge front of the mounting element to the trailing edge of the fan blade at the first end. 12. The modification for a fan blade in accordance with claim 1, characterized in that the vertical element has a trailing edge, wherein the mounting element has a trailing edge, wherein when mounted on the first end of a blade of the fan having a trailing edge, the distance from the trailing edge of the mounting element to a point at the trailing edge of the vertical element, is greater than the distance from the trailing edge of the element to the trailing edge of the fan blade in the first extreme. 13. The modification for a fan blade according to claim 1, characterized in that the vertical element has a lower edge, wherein the mounting element has a lower surface, wherein when mounted on the first end of a fan blade having a lower surface, the distance from the bottom surface of the mounting element to a point at the lower edge of the vertical element is greater than the distance from the surface bottom of the element at any point on the bottom surface of the fan blade at the first end of the fan blade. 14. The modification for a fan blade according to claim 1, characterized in that the vertical element has a upper edge, wherein the mounting element has an upper surface, wherein when mounted on the first end of a fan blade having an upper surface, the distance from the upper surface of the mounting element to a point on the edge upper of the vertical element, is greater than the distance from the upper surface of the element to any point on the upper surface of the fan blade at the first end of the fan blade. 15. A modification case for a fan blade, characterized in that it comprises: (a) a vertical element; (b) a mounting element, wherein the mounting element is essentially perpendicular to at least a portion of the vertical element, wherein the mounting element is configured to be mounted at a first end of the fan blade, wherein the The fan blade is configured to be mounted in a fan hub at a second end of the fan blade, the second end is opposite the first end; and (c) at least one fastener, the at least one fastener is configured to secure the mounting element with the first end. 16. A fan characterized in that it comprises: (a) a hub, the hub operates to rotate, (b) a plurality of fan blades, each fan blade having a first end and a second end, in where each pallor of the veníilador monfa in the cube in his respecíivo first exíremo; and (c) a monied aleia in the second eximere of each pallia of the venfilador. 17. The venilator according to claim 16, characterized in that each aleia comprises a verlical element and an assembly element. 18. The venilator according to claim 17, characterized in that the moniage element is essentially perpendicular from the vertical element. 19. The fan according to claim 17, characterized in that at least a portion of each element of moniage is configured to be adjusted in the second eximeum of a respective pallet of the venfilator. 20. The venilator according to claim 16, characterized in that the disenciation between the first exirheme and the second exirheme of each pallet of the venilator is approximately 1.2 meters. 20. A method for modifying a fan blade, characterized in that it comprises securing a fin with one end of the fan blade, the fin comprising a vertical member and a moniage element, wherein at least a portion of the monoma element is essentially perpendicular to at least a portion of the veríical element, where the element of moníaje is configured to be coupled with an exíremo of the pallía of the venfilador. 22. A veniailator pallet configured to be mounted on a In the rotating cube of the fan, the vane of the fan is characterized because it comprises: (a) an upper surface having a generally elliptical curvature; (b) a lower surface that has a generally elliptic curvature; (c) a leading edge, wherein each of the upper surface and the lower surface terminate at a leading edge; and (d) a fringing edge, where each of the upper surface and the lower surface eermina in an iris edge. 23. The veniailator pallet according to claim 22, characterized in that it further comprises a first radius of curvature near the leading edge and a second radius of curvature near the outer edge, wherein the first radius of curvature is less than the second radius of curvature. 24. The fan blade according to claim 22, characterized in that the curvature of the upper surface is based on a first ellipse, wherein the curvature of the lower surface is based on a second ellipse. 25. The fan blade according to claim 24, characterized in that the curvature of the second ellipse depends on the curvature of the second ellipse.