EP2557317A2 - Dual direction axial fan - Google Patents
Dual direction axial fan Download PDFInfo
- Publication number
- EP2557317A2 EP2557317A2 EP12179585A EP12179585A EP2557317A2 EP 2557317 A2 EP2557317 A2 EP 2557317A2 EP 12179585 A EP12179585 A EP 12179585A EP 12179585 A EP12179585 A EP 12179585A EP 2557317 A2 EP2557317 A2 EP 2557317A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- axial fan
- direction axial
- cover
- dual direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000009977 dual effect Effects 0.000 title claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 230000014759 maintenance of location Effects 0.000 claims abstract description 25
- 230000000717 retained effect Effects 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/34—Blade mountings
- F04D29/36—Blade mountings adjustable
- F04D29/362—Blade mountings adjustable during rotation
- F04D29/364—The blades having only a predetermined number of possible positions
Definitions
- the subject matter disclosed herein relates to a dual direction axial fan and, more particularly, to a dual direction axial fan having a switching mechanism.
- TEFC fan cooled
- a dual direction axial fan includes a body having a retention assembly and being rotatable in first or second directions, a blade being retained by the retention assembly such that the airfoil section extends from the body with the blade assuming first, second or third orientations and a switching mechanism coupled to the retention assembly to urge the blade to assume the second or the third orientation when the body rotates in the first or the second direction, respectively.
- a dual direction axial fan includes a body having a blade retention assembly and being rotatable about a centerline thereof in first or second directions, a blade having an airfoil section and a shank, the shank being retained in the body by the blade retention assembly such that the airfoil section extends from the body with the blade assuming first, second or third orientations and a switching mechanism coupled to the blade retention assembly to urge the blade to assume the second or the third orientation when the body rotates in the first or the second direction, respectively.
- a dual direction axial fan includes a hub, which is rotatable about a centerline thereof, having an annular sidewall and an endplate at a first end of the annular sidewall through which a u-shape hole is defined, a cover, through which a radial holes defined, and which is fittable to a second end of the sidewall such that the cover occupies and moves between first, second or third positions, a blade having a shank to extend through a radial hole defined in the sidewall, the blade being configured to assume first, second or third orientations, a sleeve, which is tightly fittable about the shank of the blade, a first elastic element anchored on the hub and engageable with the sleeve, a pin and nut combination to extend through a corresponding pair of the u-shaped hole and the radial hole and a second elastic element to bias the pin and nut combination toward a position whereby the cover is constrained in the second or the third position
- an axial fan is provided that can be operated in first and second rotational directions.
- an axial fan is a fan that blows fluid in axial directions.
- axial fans have blades with a given orientation that are rotated in one directed such that fluid is blown in only one direction.
- the blade orientation can be switched and the axial fan can be rotated in first and second directions to blow air in first and second axial directions.
- the axial fan can be used in many applications it would be otherwise necessary to employ inefficient radial fans.
- the axial fan includes a switching mechanism that adjusts the blades in both the directions of rotation.
- the switching mechanism is a combination of a rack and pinion mechanism and a centrifugal switch mechanism.
- the axial fan 10 includes a body 20.
- the body 20 is substantially cylindrical and is formed to define an interior therein in which a blade retention assembly 21 is retained.
- the body 20 is also rotatable about a centerline 22 thereof in first or second opposite directions.
- a rotor (not shown) may be provided along the centerline 22 to provide motive force for driving the body 20 to rotate in the first and second directions.
- the axial fan 20 further includes a blade 30 and a switching mechanism 40.
- the blade 30 includes an airfoil section 31, having an airfoil shape, and a shank32 to which the airfoil section 31 is connected.
- the shank 32 is retained in the interior of the body 20 by the blade retention assembly 21 such that the airfoil section 31 extends from the body 20 in a radial direction with the blade 30 assuming first, second or third orientations.
- the switching mechanism 40 is coupled to the blade retention assembly 21 and configured to urge the blade 30 to assume the second or the third orientations when the body 20 rotates in the first or the second direction, respectively.
- the blade retention assembly 21, the blade 30 and the switching mechanism 40 are each correspondingly plural in number and arrayed about the centerline 22 of the body 20 with substantially uniform separation.
- the switching mechanisms 40 when the body 20 is not rotating, the blades 30 as retained by the blade retention assemblies 21 are permitted by the switching mechanisms 40 to assume the first orientation, as shown in FIG. 2 .
- the switching mechanisms 40 When the body 20 rotates in the first direction, the switching mechanisms 40 cause the blades 30 to assume the second orientation, as shown in FIG. 3 , to blow air in a first axial direction.
- the switching mechanisms 40 cause the blades 30 to assume the third orientation, as shown in FIG. 4 , to blow air in a second axial direction opposite the first axial directions.
- the blade retention assembly 21 Although described above as being plural in number and arrayed about the body 20, the blade retention assembly 21, the blade 30 and the switching mechanism 40 will be hereinafter described as single features for the purpose of clarity and brevity. This is to be understood as being merely exemplary and not a limiting embodiment of the invention.
- the switching mechanism 40 includes a rack and pinion mechanism 41 and a centrifugal switch mechanism 42, which is operably coupled to the rack and pinion mechanism 41.
- the body 20 includes a hub 201 having an annular sidewall 202 with first and second opposite ends and an end plate 203 at the first end of the annular sidewall 202.
- a central aperture 204 may be formed through the end plate 203 for fitting the body 20 onto a rotor and an array of u-shaped (or "reversed smile") pin holes 205 are defined about the central aperture 204 with one pin hole 205 for each blade 30.
- a radial through hole 206 may be defined in the annular sidewall 202 through which the shank 32 of the blade 30 extends in a radial direction.
- the blade retention assembly 21 includes a portion 207 of the annular sidewall 202 at which the radial through hole 206 is defined and a first elastic element 208, such as a spring, which is anchored on the hub 201 and coupled to the shank 32 of the blade 30.
- a sleeve 209 is provided to be tightly fittable about the shank 32 of the blade 30 and engageable with the first elastic element 208.
- the body 20 further includes a cover 210 that may be snap fit onto the second end of the annular sidewall 202.
- the snap fit provides for clearance between the hub 201 and the cover 210 allowing for relative rotational movement of the hub 201 and the cover 210 between first, second or third positions.
- the first, second and third positions are respectively associated with the first, second and third orientations of the blade 30.
- the cover 210 is plate shaped and has a body 211 through which radial pin holes 212 are defined in a number and configuration that is in agreement with the pin holes 205.
- the centrifugal switch mechanism 42 includes an array of pin and nut combinations 220 and a second elastic element 230.
- Each pin and nut combination 220 includes an elongate pin 221, which extends through a corresponding pair of a pin hole 205 and a radial pin hole 212, and a nut 222 that locks the cover 210 onto the hub 201 in the axial direction.
- the second elastic element 230 may be a spring with a hook at each end to be respectively anchored to the hub 201 and the pin 221. The second elastic element 230 biases each pin and nut combination 220 toward a position whereby the cover 210 is constrained in the first, second or third position when the body 20 is not rotating or when the body 20 rotates in the first or the second direction, respectively.
- each of the pin and nut combinations 220 is illustrated.
- the pin and nut combination 220 is biased radially inwardly by the second elastic element 230 to occupy a position at a central point along the base of the pin hole 205 and at a radially inward point along the radial pin hole 212.
- the hub 201 trails the rotation and the cover 210 is static due to inertia.
- the hub 201 and the cover 210 demonstrate relative rotational movement in a first direction and the pin and nut combination 220 is forced radially outwardly against the bias of the second elastic element 230 by centrifugal force toward radially outward points of one side of the pin hole 205 (i.e., the side trailing the rotation) and the radial pin hole 212. This constrains the cover 210 at the second position.
- the pin and nut combination 220 is forced radially outwardly against the bias of the second elastic element 230 by centrifugal force toward radially outward points of one side of the pin hole 205 (i.e., the side trailing the rotation) and the radial pin hole 212.
- the hub 201 again trails the rotation with the cover 210 static such that the hub 201 and the cover demonstrate relative rotational movement in a second direction and the pin and nut combination 220 is forced radially outwardly against the bias of the second elastic element 230 by centrifugal force toward radially outward points of the other side of the pin hole 205 and the radial pin hole 212. This constrains the cover 210 at the third position.
- the rack and pinion mechanism 41 includes a gear 240 to which the shank 32 of the blade 30 is coupled and a rack 241 of the cover 210 to rotatably engage with the gear 240.
- the gear 240 includes a ring portion 242, which is tightly connected to the shank 32 of the blade 30 and teeth 243 extending from the ring portion 242 to rotatably engage with the rack 241 of the cover 210. Since the gear 240 moves with the hub 201, the relative rotational movement in the first and second directions between the hub 201 and the cover 210 causes the gear 240 to rotate about a longitudinal axis of the shank 32 of the blade 30.
- the gear 240 rotates in respectively opposite directions as well. Since the ring portion 242 is tightly connected to the shank 32, the rotation of the gear 240 causes corresponding rotation of the blade 30 into the second or the third orientations, respectively, in accordance with a rotational direction of the body 20.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A dual direction axial fan (10) is provided and includes a body (20) having a retention assembly (21) and being rotatable in first or second directions, a blade (30) being retained by the retention assembly such that the airfoil section (31) extends from the body (20) with the blade (30) assuming first, second or third orientations and a switching mechanism (40) coupled to the retention assembly (21) to urge the blade (30) to assume the second or the third orientation when the body (20) rotates in the first or the second direction, respectively.
Description
- The subject matter disclosed herein relates to a dual direction axial fan and, more particularly, to a dual direction axial fan having a switching mechanism.
- Industrial environments often employ totally enclosed, fan cooled (TEFC) motors. These motors are only slightly more expensive than open motors yet offer protection against common hazards. They are constructed with a small fan on the rear shaft of the motor, which is usually covered by a housing. This fan draws air over the motor fins and removes excess heat to cool the motor. The motor is dust tight and has a moderate water seal as well.
- In many rotating machines, it is necessary to use radial fans even though axial fans would be the ideal choice. The reason for this is that the motors are designed to rotate in both directions and, normally, single axial fans do not work in both directions. Thus, the use of radial fans represents a compromise on performance.
- According to one aspect of the invention, a dual direction axial fan is provided and includes a body having a retention assembly and being rotatable in first or second directions, a blade being retained by the retention assembly such that the airfoil section extends from the body with the blade assuming first, second or third orientations and a switching mechanism coupled to the retention assembly to urge the blade to assume the second or the third orientation when the body rotates in the first or the second direction, respectively.
- According to another aspect of the invention, a dual direction axial fan is provided and includes a body having a blade retention assembly and being rotatable about a centerline thereof in first or second directions, a blade having an airfoil section and a shank, the shank being retained in the body by the blade retention assembly such that the airfoil section extends from the body with the blade assuming first, second or third orientations and a switching mechanism coupled to the blade retention assembly to urge the blade to assume the second or the third orientation when the body rotates in the first or the second direction, respectively.
- According to yet another aspect of the invention, a dual direction axial fan is provided and includes a hub, which is rotatable about a centerline thereof, having an annular sidewall and an endplate at a first end of the annular sidewall through which a u-shape hole is defined, a cover, through which a radial holes defined, and which is fittable to a second end of the sidewall such that the cover occupies and moves between first, second or third positions, a blade having a shank to extend through a radial hole defined in the sidewall, the blade being configured to assume first, second or third orientations, a sleeve, which is tightly fittable about the shank of the blade, a first elastic element anchored on the hub and engageable with the sleeve, a pin and nut combination to extend through a corresponding pair of the u-shaped hole and the radial hole and a second elastic element to bias the pin and nut combination toward a position whereby the cover is constrained in the second or the third position when the hub rotates in the first or the second direction, respectively.
- These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
- The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
-
FIG. 1 is an enlarged cutaway side view of a dual direction axial fan; -
FIG. 2 is a side view of the duel direction axial fan ofFIG. 1 with the blades in a first orientation; -
FIG. 3 is a side view of the duel direction axial fan ofFIG. 1 rotating in a first direction with the blades in a second orientation; -
FIG. 4 is a side view of the duel direction axial fan ofFIG. 1 rotating in a second direction with the blades in a third orientation; -
FIG. 5 is a perspective view of a hub with a u-shaped through hole of the dual direction axial fan ofFIG. 1 ; -
FIG. 6 is an axial view of a cover of the hub ofFIG. 2 with radial holes; -
FIG. 7 is an axial view of a pin and nut combination in a first position when the axial fan is not rotating; -
FIG. 8 is an axial view of a pin and nut combination in a second position when the axial fan is rotating in a first direction; and -
FIG. 9 is an axial view of a pin and nut combination in a third position when the axial fan is rotating in a second direction. - The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
- In accordance with an aspect of the invention, an axial fan is provided that can be operated in first and second rotational directions. For the purposes of the detailed description below, an axial fan is a fan that blows fluid in axial directions. Normally, axial fans have blades with a given orientation that are rotated in one directed such that fluid is blown in only one direction. In the present invention, however, the blade orientation can be switched and the axial fan can be rotated in first and second directions to blow air in first and second axial directions. The axial fan can be used in many applications it would be otherwise necessary to employ inefficient radial fans. In order to achieve this, the axial fan includes a switching mechanism that adjusts the blades in both the directions of rotation. The switching mechanism is a combination of a rack and pinion mechanism and a centrifugal switch mechanism.
- With reference to
FIG. 1 , a dual directionaxial fan 10 is provided. Theaxial fan 10 includes abody 20. Thebody 20 is substantially cylindrical and is formed to define an interior therein in which ablade retention assembly 21 is retained. Thebody 20 is also rotatable about acenterline 22 thereof in first or second opposite directions. A rotor (not shown) may be provided along thecenterline 22 to provide motive force for driving thebody 20 to rotate in the first and second directions. Theaxial fan 20 further includes ablade 30 and aswitching mechanism 40. Theblade 30 includes anairfoil section 31, having an airfoil shape, and a shank32 to which theairfoil section 31 is connected. Theshank 32 is retained in the interior of thebody 20 by theblade retention assembly 21 such that theairfoil section 31 extends from thebody 20 in a radial direction with theblade 30 assuming first, second or third orientations. Theswitching mechanism 40 is coupled to theblade retention assembly 21 and configured to urge theblade 30 to assume the second or the third orientations when thebody 20 rotates in the first or the second direction, respectively. - With reference to
FIGS. 2, 3 and 4 , theblade retention assembly 21, theblade 30 and theswitching mechanism 40 are each correspondingly plural in number and arrayed about thecenterline 22 of thebody 20 with substantially uniform separation. With this construction, when thebody 20 is not rotating, theblades 30 as retained by theblade retention assemblies 21 are permitted by theswitching mechanisms 40 to assume the first orientation, as shown inFIG. 2 . When thebody 20 rotates in the first direction, theswitching mechanisms 40 cause theblades 30 to assume the second orientation, as shown inFIG. 3 , to blow air in a first axial direction. By contrast, when thebody 20 rotates in the second direction, theswitching mechanisms 40 cause theblades 30 to assume the third orientation, as shown inFIG. 4 , to blow air in a second axial direction opposite the first axial directions. - Although described above as being plural in number and arrayed about the
body 20, theblade retention assembly 21, theblade 30 and theswitching mechanism 40 will be hereinafter described as single features for the purpose of clarity and brevity. This is to be understood as being merely exemplary and not a limiting embodiment of the invention. - With reference back to
FIG. 1 and with further reference toFIGS. 5 and 6 , theswitching mechanism 40 includes a rack andpinion mechanism 41 and acentrifugal switch mechanism 42, which is operably coupled to the rack andpinion mechanism 41. - As shown in
FIG. 5 , thebody 20 includes ahub 201 having anannular sidewall 202 with first and second opposite ends and anend plate 203 at the first end of theannular sidewall 202. Acentral aperture 204 may be formed through theend plate 203 for fitting thebody 20 onto a rotor and an array of u-shaped (or "reversed smile")pin holes 205 are defined about thecentral aperture 204 with onepin hole 205 for eachblade 30. A radial throughhole 206 may be defined in theannular sidewall 202 through which theshank 32 of theblade 30 extends in a radial direction. Theblade retention assembly 21 includes aportion 207 of theannular sidewall 202 at which the radial throughhole 206 is defined and a firstelastic element 208, such as a spring, which is anchored on thehub 201 and coupled to theshank 32 of theblade 30. In accordance with an embodiment, asleeve 209 is provided to be tightly fittable about theshank 32 of theblade 30 and engageable with the firstelastic element 208. - As shown in
FIG. 6 , thebody 20 further includes acover 210 that may be snap fit onto the second end of theannular sidewall 202. The snap fit provides for clearance between thehub 201 and thecover 210 allowing for relative rotational movement of thehub 201 and thecover 210 between first, second or third positions. The first, second and third positions are respectively associated with the first, second and third orientations of theblade 30. Thecover 210 is plate shaped and has a body 211 through whichradial pin holes 212 are defined in a number and configuration that is in agreement with thepin holes 205. - The
centrifugal switch mechanism 42 includes an array of pin andnut combinations 220 and a secondelastic element 230. Each pin andnut combination 220 includes anelongate pin 221, which extends through a corresponding pair of apin hole 205 and aradial pin hole 212, and anut 222 that locks thecover 210 onto thehub 201 in the axial direction. The secondelastic element 230 may be a spring with a hook at each end to be respectively anchored to thehub 201 and thepin 221. The secondelastic element 230 biases each pin andnut combination 220 toward a position whereby thecover 210 is constrained in the first, second or third position when thebody 20 is not rotating or when thebody 20 rotates in the first or the second direction, respectively. - With reference back to
FIG. 1 and with further toFIGS. 1 ,7, 8 and 9 , the various positions of each of the pin andnut combinations 220 are illustrated. As shown inFIG. 7 , with thebody 20 not rotating, the pin andnut combination 220 is biased radially inwardly by the secondelastic element 230 to occupy a position at a central point along the base of thepin hole 205 and at a radially inward point along theradial pin hole 212. This constrains thecover 210 at the first position. As shown inFIG. 8 , with thebody 20 rotating in the first direction, thehub 201 trails the rotation and thecover 210 is static due to inertia. Thus, thehub 201 and thecover 210 demonstrate relative rotational movement in a first direction and the pin andnut combination 220 is forced radially outwardly against the bias of the secondelastic element 230 by centrifugal force toward radially outward points of one side of the pin hole 205 (i.e., the side trailing the rotation) and theradial pin hole 212. This constrains thecover 210 at the second position. By contrast, as shown inFIG. 9 , with thebody 20 rotating in the second direction, thehub 201 again trails the rotation with thecover 210 static such that thehub 201 and the cover demonstrate relative rotational movement in a second direction and the pin andnut combination 220 is forced radially outwardly against the bias of the secondelastic element 230 by centrifugal force toward radially outward points of the other side of thepin hole 205 and theradial pin hole 212. This constrains thecover 210 at the third position. - The rack and
pinion mechanism 41 includes agear 240 to which theshank 32 of theblade 30 is coupled and a rack 241 of thecover 210 to rotatably engage with thegear 240. Thegear 240 includes aring portion 242, which is tightly connected to theshank 32 of theblade 30 andteeth 243 extending from thering portion 242 to rotatably engage with the rack 241 of thecover 210. Since thegear 240 moves with thehub 201, the relative rotational movement in the first and second directions between thehub 201 and thecover 210 causes thegear 240 to rotate about a longitudinal axis of theshank 32 of theblade 30. Thus, when thecover 210 is rotated toward and constrained in the second or the third position, thegear 240 rotates in respectively opposite directions as well. Since thering portion 242 is tightly connected to theshank 32, the rotation of thegear 240 causes corresponding rotation of theblade 30 into the second or the third orientations, respectively, in accordance with a rotational direction of thebody 20. - While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the scope of the invention as defined in the appended claims. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
Claims (14)
- A dual direction axial fan (10), comprising:a body (20) having a retention assembly (21) and being rotatable in first or second directions;a blade (30) being retained by the retention assembly (21) such that the airfoil section 31 extends from the body (20) with the blade (30) assuming first, second or third orientations; anda switching mechanism (40) coupled to the retention assembly (21) to urge the blade (30) to assume the second or the third orientation when the body (20) rotates in the first or the second direction, respectively.
- The dual direction axial fan (10) according to claim 1, wherein the retention assembly (21), the blade (30) and the switching mechanism (40) are each correspondingly plural in number and arrayed about the body (20) with uniform separation.
- The dual direction axial fan (10) according to claim 1 or claim 2, wherein the switching mechanism (40) comprises:a rack and pinion mechanism (41); anda centrifugal switch mechanism (42) operably coupled to the rack and pinion mechanism (41).
- The dual direction axial fan (10) according to claim 3, wherein the body (20) comprises:a hub (201) having an annular sidewall (202) and an end plate (203) at a first end thereof, through which u-shaped pin holes (205) are defined; anda cover (210) through which radial pin holes (212) are defined, the cover (210) being fittable to a second end of the sidewall (202) such that the cover (210) occupies and moves between first, second or third positions associated with the first, second and third orientations, respectively.
- The dual direction axial fan according to claim 4, wherein the u-shaped pin holes (205) are defined about an axial aperture through the end plate (203).
- The dual direction axial fan (10) according to claim 4 or claim 5, wherein a radial through hole (206) through which a shank (32) of the blade (30) extends is defined through the sidewall (202).
- The dual direction axial fan (10) according to claim 6, the blade retention assembly (21) comprising:a portion of the sidewall (202) at which the radial through hole (206) is defined; anda first elastic element (208) anchored on the hub (201) and coupled to the shank (32) of the blade (30).
- The dual direction axial fan (10) according to claim 6 or claim 7, further comprising a sleeve (209), which is tightly fittable about the shank (32) of the blade (30) and which is engageable with the first elastic element (208).
- The dual direction axial fan (10) according to claim 6, 7 or 8, wherein the centrifugal switch mechanism (42) comprises:an array of pin and nut combinations (220), each pin and nut combination (220) being configured to respectively extend through a corresponding pair of a u-shaped pin hole (205) and a radial pin hole (212); anda second elastic element (230) to bias each pin and nut combination (220) toward a position whereby the cover (210) is constrained in the second or the third position when the body (20) rotates in the first or the second direction, respectively.
- The dual direction axial fan (10) according to claim 9, wherein the rack and pinion mechanism (41) comprises:a gear (240) to which the shank (32) of the blade (30) is coupled; anda rack (241) of the cover (210) to rotatably engage with the gear (240).
- The dual direction axial fan according to claim 10, wherein the gear (240) comprises:a ring portion connected to the shank (32) of the blade (30); andteeth extending from the ring portion to rotatably engage with the rack of the cover.
- The dual direction axial fan (10) according to any one of claims 1 to 11, comprising:a body (20) having a blade retention assembly (21) and being rotatable about a centerline thereof in first or second directions;a blade (30) having an airfoil section (31) and a shank (32), the shank (32) being retained in the body (20) by the blade retention assembly (21) such that the airfoil section (31) extends from the body (20) with the blade (30) assuming first, second or third orientations; anda switching mechanism (40) coupled to the blade retention assembly (21) to urge the blade (30) to assume the second or the third orientation when the body (20) rotates in the first or the second direction, respectively.
- The dual direction axial fan (10) according to claim 12, wherein the blade retention assembly (21), the blade (30) and the switching mechanism (40) are each correspondingly plural in number and arrayed about the centerline of the body (20).
- A dual direction axial fan, comprising:a hub (201), which is rotatable about a centerline thereof, having an annular sidewall (202) and an endplate (203) at a first end of the annular sidewall through which a u-shape hole (205) is defined;a cover (210), through which a radial hole (212) is defined, and which is fittable to a second end of the sidewall such that the cover (210) occupies and moves between first, second or third positions;a blade (30) having a shank to extend through a radial hole defined in the sidewall (202), the blade (30) being configured to assume first, second or third orientations;a sleeve (209), which is tightly fittable about the shank of the blade (30);a first elastic element (208) anchored on the hub (204) and engageable with the sleeve (209);a pin and nut combination (220) to extend through a corresponding pair of the u-shaped hole and the radial hole; anda second elastic element (230) to bias the pin and nut combination (220) toward a position whereby the cover (210) is constrained in the second or the third position when the hub (201) rotates in the first or the second direction, respectively.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/206,640 US20130039766A1 (en) | 2011-08-10 | 2011-08-10 | Dual direction axial fan |
Publications (1)
Publication Number | Publication Date |
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EP2557317A2 true EP2557317A2 (en) | 2013-02-13 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12179585A Withdrawn EP2557317A2 (en) | 2011-08-10 | 2012-08-07 | Dual direction axial fan |
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US (1) | US20130039766A1 (en) |
EP (1) | EP2557317A2 (en) |
CN (1) | CN102954037A (en) |
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DE102015002621B3 (en) * | 2015-02-27 | 2016-04-14 | Hägele GmbH | Fan wheel with a with a drive source rotatably to be connected hub shell |
US10948199B2 (en) * | 2018-12-12 | 2021-03-16 | Bsh Home Appliances Corporation | Cooktop ventilation system having a dual direction flow blower/fan |
EP3719972A1 (en) * | 2019-04-04 | 2020-10-07 | Siemens Aktiengesellschaft | Drive unit with a cooling unit |
DE102019134887A1 (en) * | 2019-12-18 | 2021-06-24 | Ie Assets Gmbh & Co. Kg | Fan wheel |
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US2257976A (en) * | 1938-11-02 | 1941-10-07 | Charles L Moorman | Variable pitch propeller |
US2869648A (en) * | 1956-08-09 | 1959-01-20 | Sears Roebuck & Co | Ventilating fan with reversible pitch blade |
EP0303917B1 (en) * | 1987-08-21 | 1991-10-30 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Fluid apparatus |
CA1328433C (en) * | 1988-10-03 | 1994-04-12 | Clarence Isert | Variable pitch fan with fan cranks and axle housed shifting means |
US6116856A (en) * | 1998-09-18 | 2000-09-12 | Patterson Technique, Inc. | Bi-directional fan having asymmetric, reversible blades |
KR100903050B1 (en) * | 2007-09-17 | 2009-06-18 | (주)한서정공 | Fan for spraying agricultural chemicals |
-
2011
- 2011-08-10 US US13/206,640 patent/US20130039766A1/en not_active Abandoned
-
2012
- 2012-08-07 EP EP12179585A patent/EP2557317A2/en not_active Withdrawn
- 2012-08-10 CN CN2012102836038A patent/CN102954037A/en active Pending
Non-Patent Citations (1)
Title |
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None |
Also Published As
Publication number | Publication date |
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CN102954037A (en) | 2013-03-06 |
US20130039766A1 (en) | 2013-02-14 |
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