CN100374731C - High efficiency ceiling fan - Google Patents
High efficiency ceiling fan Download PDFInfo
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- CN100374731C CN100374731C CNB031503268A CN03150326A CN100374731C CN 100374731 C CN100374731 C CN 100374731C CN B031503268 A CNB031503268 A CN B031503268A CN 03150326 A CN03150326 A CN 03150326A CN 100374731 C CN100374731 C CN 100374731C
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- ceiling fan
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- wheel hub
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- 230000007423 decrease Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract 1
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- 230000008901 benefit Effects 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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Abstract
Ceiling fan energy consumption efficiency is enhanced with fan blades that have an angle attack that decreases from root end to tip end at higher rates of decrease nearer their tip ends than at their root ends. Air flow distribution is enhanced with at least a portion of the blades having a dihedral that continuously increases.
Description
The related application reference
The application is that the sequence number of submission on July 11st, 2002 is 10/194,699 partial continuous application case.
Technical field
The present invention relates generally to ceiling fan, relate to electronic ceiling fan and efficient thereof especially.
Background technique
It is existing for many years to be used for circulating air by motor-driven ceiling fan.This type of ceiling fan typically has a motor that is arranged in shell, and this motor is fixed on the up-and-down rod, so that fan blade is around this up-and-down rod rotation.This fan blade is flat traditionally, makes it have certain inclination or pitch when directed, so that form an angle of attack with respect to air mass when rotating in air, so just can drive air downwards.
When the rotation of the fan blade that radially extended out by running shaft, the path that its tip experienced in the regular hour is more than path length that its root experienced.Therefore the speed of fan blade tip is much larger than the speed of its root.For balance along the resistance of the wind of blade and the air stream that produces by blade movement, when the design fan, its angle of attack is successively decreased towards distal direction.This design feature also is usually used in designing other rotation blade, for example marine propeller and properller.
1997, Florida, US solar energy center (Florida Solar Energy Center) did a research to the efficient of several commercially available ceiling fans.This test was reported in the U. S. application patent No. is 6039541 patent case.This owner of a patent finds, by making it reversing of several years be arranged at root at the design blade, this windup-degree evenly successively decreases until forming a less torsion angle or an angle of attack to blade tips, and (just the air stream (CFM) that produced of each power consumpiton (is unit with the watt) will increase efficiency.For example, this is applied to have reversing of one 26.7 ° of angles at its root, and is 6.9 ° at its tip torsion angle, on long 20 inches the blade (this blade has tapered chord).
Another long-standing problem of ceiling fan is an airflow distribution.Though an angle of attack is arranged when directed, the blade of most of ceiling fans only rotates in horizontal plane, and this just forces air-flow downward, especially the air-flow in the fan lower room.But because air-flow is directly from fan flow, the air-flow in the surrounding space seldom.Have place, the upper counterangle in fan blade, this type of problem has reduced.But this can only be a cost with the air-flow that reduces significantly under the fan.
Summary of the invention
Have now found that unification reduces the angle of attack equably or torsion angle is not the way of full blast for ceiling fan.The end of bipod blade or propeller cavitation is circumference of operation or 2 in one changes
π(2), therefore the mid point of outwardly directed blade moves 2 in one changes
π(1) distance of half in other words.Because the movement locus of properller is usually located in the plane vertical with its flight path, so this linear relationship is effective for properller.Yet the running orbit of ceiling fan is parallel to air stream and is positioned under the air stream constraint, just be parallel to ceiling board itself and be positioned under it, therefore its blade and unlike aircraft, evenly impacting with air mass, this be because at the tip of ceiling fan blade than at the easier acquisition in tip inboard " displacement " air.The air of blades adjacent running shaft must be from surrounding environment, and arriving at air will be through the confined space between ceiling plane and the fan blade in the process of root end of blade.
After understanding this point, having been found that now when forming blade increases the efficient that can improve ceiling fan unevenly by making from its angle of attack from the root to the tip.More particularly be exactly to have been found that now the variance ratio of the angle of attack or pitch should be than bigger at contiguous root place at blades adjacent tip place.This obviously is to be used for forcing the displaced air under the ceiling board restriction, on the blade inwardly to move, so that can easily obtain more air near the root end of blade.Yet no matter this theory correctness, the true verified efficient of making fan like this is improved.The angle of attack by making fan greater than the variance ratio at its root, has found that the efficient of fan is greatly improved at the variance ratio of its tip.
Because the blade of fan is formed by the upwards curve with the upper counterangle that continues variation, the air-flow of ceiling fan distributes and has also improved now.Be more preferably, air-flow is continuous distributed from the root of blade to the tip, and this point can non-homogeneously reduce the angle of attack or reverses and realize in conjunction with described above.The result who takes above measure can provide a kind of not only efficient height but also can make the better ceiling fan of distribution of gas.
Therefore, in order to overcome the shortcoming of traditional ceiling fan, the object of the present invention is to provide a kind of being not only efficiently and the ceiling fan of air distribution better.In one embodiment of the invention, a kind of ceiling fan is provided, it has a plurality of fan blade and rotates around wheel hub, and the root of each blade is installed on the described wheel hub, blade tips is away from described wheel hub, wherein each blade near described wheel hub than the one bigger angle of attack being arranged away from described wheel hub, and the angle of attack variation rate between the two is uneven, wherein each blade has at least a part upwards crooked gradually towards its tip, promotes air-flow to disperse to obtain a upper counterangle that continues to change.In another embodiment, a kind of ceiling fan is provided, it has a plurality of fan blade and rotates around a wheel hub, wherein each blade near described wheel hub than the one bigger angle of attack being arranged away from described wheel hub, angle of attack variation rate between the two is uneven, and the upwards arc that each blade has at least a part to increase progressively for the upper counterangle disperses to promote air-flow.
Description of drawings
Fig. 1 is for having realized the side view of ceiling fan of the present invention with preferred versions.
Fig. 2 is a sketch of the ceiling fan blade among Fig. 1, for ease of showing, supposes that it shows with two dimensional form.
Fig. 3 is a sketch of the ceiling fan blade among Fig. 2, has shown along the angle of the diverse location blade twist of blade.
Fig. 4 is a chart of air stream test parameter.
Fig. 5 is the side view of a blade of fan shown in Figure 1.
Fig. 6 is the top view of a blade of fan shown in Figure 1.
Fig. 7 is the end view of a blade of fan shown in Figure 1.
Embodiment
In Application No. is that disclosed fan blade technology is followed such supposition in 6039541 the patent case: all enter the air stream of fan blade all from a direction vertical with the blade plane of rotation.In addition, just as employed in the properller theory, suppose that also air stream flow to blade tips from the root of blade with constant speed.Utilize this hypothesis, just making the windup-degree from the root end to the tip in design during blade is certain value.
The purpose of twist blade is to attempt to optimize the relative angle of attack of airflow direction with respect to blade surface.Do like this is in order to guarantee that blade all turns round with optimum angle of attack to its tip from its root.It is in order to adapt to such fact that this angle changes, and promptly the speed that moves of blade tips is faster than the speed that blade diameter root moves, and the increase of speed has changed the relative wind direction of blade top.
Besides, have been found that now this supposition has not been suitable for ceiling fan.Ceiling fan is an air repetitive cycling device, and passes air unlike properller.On fan blade, to its tip, air does not move along same direction vector from its root, even speed is also inequality.
Fig. 1 has shown one, and all the other are the ceiling fan of conventional construction except that its blade shape.As seen from the figure, fan is installed under the ceiling board by a up-and-down rod, and this up-and-down rod extend out to a shell that is used for placing motor and switch capsule from ceiling board.Can also see also having a light fixture from here in the wind bottom.Provide power by the electric conductor that extend out to mains supply from up-and-down rod to motor, rotate with drive vane.
Can see that from figure fan blade has been reversed and do not become flat, so that form a upper counterangle that gradually changes.The air stream of turnover fan blade is represented with many lines of band arrow.We can see intuitively why not fan blade runs into air bolus as properller from these lines.On the contrary, the confined space on the blade has changed the air stream vector that enters fan, makes its air stream vector with aircraft opposite.
Sketch as shown in Figure 2, the width of each fan blade or wing chord all form a tapering.Each blade all is tapered to its tip from its base portion or root, so that it becomes narrower at tip.In addition, although for embodying advantage of the present invention and unnecessary, each blade had better have a upper counterangle as shown in fig. 1.The design upper counterangle is to distribute widelyer for air in the fan lower room is dispersed.
Continuation can be seen referring to figs. 2 and 3 us, although blade is actually monomer structure, still it is divided into three zones.24 inches long blades have the zone of three equal lengths herein, and promptly each zone is long 8 inches.As shown in Figure 1, All Ranges has all been reversed several angle, but it is different to reverse speed from the root to the tip.From reversing of beginning of root or the angle of attack reduces up to become 10 ° at tip always.Can also know from Fig. 1 and see that this angle of attack reduces with three kinds of different speed.In first the 8 inches zones near root, torsional variation speed is 0.4 ° of per inch; Zone in the centre, torsional variation speed are 0.7 ° of per inch; For the 3rd zone of contiguous tip, torsional variation speed is 1.0 ° of per inch.Certainly between each zone a little transformation is arranged, its conspicuousness can be ignored.Therefore in Fig. 3, the difference from an end of exterior lateral area to its other end angle of attack is 8 ° (1 °/inch * 8 inches).The difference of the zone line two ends angle of attack is approximately 6 °, and the angle of attack difference at medial region two ends is about 3 °.
Fig. 5-7 understands a blade 10 of fan among Fig. 1 in more detail.As can be seen from the figure, the root 11 of this blade is installed on the rotor wheel hub 12, and tip is away from hub end.As shown in Figure 1, wheel hub is around the straight vertical vertical rod rotation of stretching out from ceiling board.Can find out obviously that from blade centreline 15 blade is 0 ° at the upper counterangle at its root 11 places, upper counterangle d at its tip 13 places
tIt is 10 °.This fan blade is circular arc or the curve that continues from an end to the other end, thereby the upper counterangle that passes through also is to continue to change.Air-flow distribution dotted line as shown in fig. 1, its effect are with air-distribution under fan and in the space on every side.On the contrary, the fan in the prior art mainly moves downward gas-powered to fan, and the air-flow in the surrounding space is circuitous and faint.The fan at the upper counterangle has solved this problem though those have tilted fixedly in whole blade length, and this is to be cost to reduce air-flow under the fan.
The blade upper counterangle can continue to increase from an end to the other end, but along with circular arc or the approaching end of curve, near near the root or the upper counterangle the tip place may be definite value.According to the design of sea-gull formula, the most effective actual design is that the upper counterangle of half is 0 ° from root to the distance tip, continues to increase then, and the upper counterangle is 10 ° when arriving tip.In preferred embodiment, the root of blade upper counterangle is 0 °, 10 ° at the tip upper counterangle.But the root upper counterangle can less than or greater than 0 °, the tip upper counterangle also can less than or greater than 10 °.Fan dimension, power, height and application are all factors of required consideration when selecting the special upper counterangle.
In Hunter Fan Company (Hunter fan company) laboratory fan is tested; i.e. " Energy Star adaptability " (Energy Star Compliance) tests, and obtained the authentication of environmental protection institution (Environmental Protection Agency).Above the deacration velocity transducer also is installed in and near outside the fan blade, tested fan according to " Energy Star " test request.So just can test the contiguous air velocity of fan.In test process, from the root end to the tip, the speed of diverse location air is also inequality on fan blade in identification.Fig. 4 has provided test parameter, and table 1 is actual test result.
Table 1
| Sensor | Mean velocity feet per minute clock (FPM) | Air velocity feet per second (FPS) | Spinner velocity feet per second (FPS) | Resultant velocity | Accumulated angle | Degree/inch |
| 0 | 283 | 4.7 | 22.7 | 23.2 | 11.7 | |
| 1 | 303 | 5.1 | 24.4 | 24.9 | 11.7 | 0.07 |
| 2 | 320 | 5.3 | 26.2 | 26.7 | 11.5 | 0.16 |
| 3 | 325 | 5.4 | 27.9 | 28.4 | 11.0 | 0.54 |
| 4 | 320 | 5.3 | 29.7 | 30.1 | 10.2 | 0.79 |
| 5 | 313 | 5.2 | 31.4 | 31.8 | 9.4 | 0.76 |
| 6 | 308 | 5.1 | 33.1 | 33.5 | 8.8 | 0.63 |
| 7 | 305 | 5.1 | 34.9 | 35.3 | 8.3 | 0.51 |
| 8 | 290 | 4.8 | 36.6 | 37.0 | 7.5 | 0.77 |
| 9 | 275 | 4.6 | 38.4 | 38.7 | 6.8 | 0.71 |
| 10 | 262 | 4.4 | 40.1 | 40.4 | 6.2 | 0.60 |
| 11 | 235 | 3.9 | 41.9 | 42.0 | 5.3 | 0.87 |
| 12 | 174 | 2.9 | 43.6 | 43.7 | 3.8 | 1.54 |
| 13 | 132 | 2.2 | 45.4 | 45.5 | 2.8 | 1.03 |
Table 2 has provided the comparative test result, wherein blade 1 is a new blade of just having described, it has one 10 ° the fixedly upper counterangle, blade 2 is that to utilize the number of applying for a patent be the Hampton Bay Gossomer Wind/Windward blade of the art designs talked about in 6 039 541 the patent case, blade 3 be one fixedly the angle of attack be 15 ° flat blade.As defined above, listed data mean the improvement of efficiency aspect in the table.
Table 2
| Blade | Motor | The band cylinder | Improvement aspect Hampton Bay | Improvement on standard | Improvement aspect Hampton Bay | Be not with cylinder | Improvement outside 4 feet |
| 1 | 172× 18AM | 12878 | 21％ | 29％ | 37327 | 24％ | 27％ |
| 2 | 188× 15 | 10639 | NA | 6％ | 30034 | NA | NA |
| 3 | 172× 18AM | 10018 | -6％ | NA | 28000 | -7％ | -7％ |
Therefore can see that the ceiling fan that provides has now significantly improved efficiency than the ceiling fan that adopts prior art, and has promoted the air-flow distribution.Fan also can be used on other position certainly, on table.Although utilize the preferred versions of ceiling fan to show and describe, as long as we will be appreciated that without departing from the spirit and scope of the present invention, can carry out other change, increase and decrease.
Claims (12)
1. ceiling fan, it has a plurality of fan blade and rotates around wheel hub, and the root of each blade is installed on the described wheel hub, blade tips is away from described wheel hub, wherein each blade near described wheel hub than the one bigger angle of attack being arranged away from described wheel hub, and the angle of attack variation rate between the two is uneven, and wherein each blade has at least a part upwards crooked gradually towards its tip, promotes air-flow to disperse to obtain a upper counterangle that continues to change.
2. ceiling fan according to claim 1, wherein each blade is crooked continuously gradually from its root to tip.
3. ceiling fan according to claim 2, wherein the upper counterangle of each root of blade is 0 °, the upper counterangle of tip is 10 °.
4. ceiling fan according to claim 1, wherein attack angle of blade is from extremely continuing to reduce away from described wheel hub near the described wheel hub.
5. ceiling fan according to claim 4, wherein each blade has one 10 ° the upper counterangle at tip, and tip has one 10 ° the angle of attack.
6. ceiling fan, it has a plurality of fan blade and rotates around a wheel hub, wherein each blade near described wheel hub than the one bigger angle of attack being arranged away from described wheel hub, angle of attack variation rate between the two is uneven, and the upwards arc that each blade has at least a part to increase progressively for the upper counterangle disperses to promote air-flow.
7. ceiling fan according to claim 6, wherein each blade is the circular arc that makes progress continuously from its root to tip.
8. ceiling fan according to claim 6, wherein each blade is 0 ° at the upper counterangle of its root.
9. ceiling fan according to claim 6, wherein each blade is 10 ° at the upper counterangle of its tip.
10. ceiling fan according to claim 9, wherein each blade is 0 ° at the upper counterangle of its root.
11. ceiling fan according to claim 6, wherein each blade at root to being 0 ° apart from the upper counterangle at its half place of tip, from this mid point to tip, upper counterangle continuous increasing.
12. ceiling fan according to claim 11, wherein each blade is 10 ° at the upper counterangle of its tip.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/209,044 | 2002-07-30 | ||
| US10/209,044 US6719532B2 (en) | 2002-07-11 | 2002-07-30 | High efficiency ceiling fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1483940A CN1483940A (en) | 2004-03-24 |
| CN100374731C true CN100374731C (en) | 2008-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031503268A Expired - Fee Related CN100374731C (en) | 2002-07-30 | 2003-07-24 | High efficiency ceiling fan |
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| Country | Link |
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| CN (1) | CN100374731C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7726945B2 (en) * | 2007-02-08 | 2010-06-01 | Rite-Hite Holding Corporation | Industrial ceiling fan |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4640668A (en) * | 1982-08-02 | 1987-02-03 | Yang Tai Her | Ceiling fan with adjustable blowing scope thru a speed-servo and with driving speed control means |
| CN2110115U (en) * | 1991-07-30 | 1992-07-15 | 马中蓬 | Double curve degree fan vane |
| CN2171707Y (en) * | 1993-08-22 | 1994-07-13 | 蔡博 | Hanging fan |
| CN2360651Y (en) * | 1998-09-03 | 2000-01-26 | 殷建中 | Curved warped blade ceiling fan |
| US6341940B1 (en) * | 1998-10-08 | 2002-01-29 | Gate S.P.A. | Axial fan, particularly for cooling a heat-exchanger in a motor-vehicle |
-
2003
- 2003-07-24 CN CNB031503268A patent/CN100374731C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4640668A (en) * | 1982-08-02 | 1987-02-03 | Yang Tai Her | Ceiling fan with adjustable blowing scope thru a speed-servo and with driving speed control means |
| CN2110115U (en) * | 1991-07-30 | 1992-07-15 | 马中蓬 | Double curve degree fan vane |
| CN2171707Y (en) * | 1993-08-22 | 1994-07-13 | 蔡博 | Hanging fan |
| CN2360651Y (en) * | 1998-09-03 | 2000-01-26 | 殷建中 | Curved warped blade ceiling fan |
| US6341940B1 (en) * | 1998-10-08 | 2002-01-29 | Gate S.P.A. | Axial fan, particularly for cooling a heat-exchanger in a motor-vehicle |
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| Publication number | Publication date |
|---|---|
| CN1483940A (en) | 2004-03-24 |
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Granted publication date: 20080312 Termination date: 20120724 |