US20170298959A1 - Extraction blower - Google Patents
Extraction blower Download PDFInfo
- Publication number
- US20170298959A1 US20170298959A1 US15/132,576 US201615132576A US2017298959A1 US 20170298959 A1 US20170298959 A1 US 20170298959A1 US 201615132576 A US201615132576 A US 201615132576A US 2017298959 A1 US2017298959 A1 US 2017298959A1
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- United States
- Prior art keywords
- facing blades
- housing
- base plate
- extraction blower
- chamber
- 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.)
- Abandoned
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Classifications
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- 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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
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- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- 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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
Definitions
- the present disclosure relates generally to blowers and, more particularly, to extraction blowers for separating solids and/or liquids from an air source.
- Extraction blowers may be used to blow air obtained from the atmosphere to cool and/or ventilate structures or equipment.
- the air obtained from the atmosphere may contain solid and/or liquid particles.
- extraction blowers are utilized to remove at least some of the solid and/or liquid particles from the obtained atmospheric air to thereby deliver “clean” air for the process of cooling and/or ventilating structures or equipment.
- an extraction blower comprises a housing having a main air chamber, a debris chamber and a particulate removal port connected to the debris chamber, an impeller configured to rotate within the housing about a central axis and having a base plate disposed in the debris chamber and a top plate disposed in the main air chamber, a plurality of front-facing blades mounted on a front side of the base plate between the base plate and the top plate, and a plurality of rear-facing blades mounted on a rear side of the base plate.
- FIG. 1 is a perspective view of an exemplary extraction blower
- FIG. 2 is a rear view of an exemplary extraction blower
- FIG. 3 is a cutaway view of the interior space of the hood of an exemplary extraction blower
- FIG. 4 is a cutaway, perspective view of a housing with an impeller of an exemplary extraction blower
- FIG. 5 is another cutaway, perspective view of a housing with an impeller of an exemplary extraction blower
- FIG. 6 is a bottom view of an exemplary extraction blower
- FIG. 7 is a side view of an exemplary impeller.
- FIG. 8 is a perspective view of an exemplary impeller.
- the extraction blower 10 comprises a motor 100 , a housing 200 , a hood 300 and an impeller 400 configured to be driven by the motor 100 and configured to rotate within the housing 200 .
- the motor 100 of the extraction blower 10 may be an electric motor comprising a rotating output shaft (not shown).
- the housing 200 defines an air intake opening 202 , a shaft opening 204 , a partition opening 208 , a main air chamber 210 , a debris chamber 212 , an air outlet 214 and particulate removal ports 218 .
- the housing 200 comprises a front housing wall 220 , a rear housing wall 222 , a partition wall 224 , a side housing wall 228 , a bottom support 230 and particulate removal conduits 232 .
- the front housing wall 220 defines the air intake opening 202 .
- the rear housing wall 222 defines the shaft opening 204 .
- the partition wall 224 defines the partition opening 208 .
- the air intake opening 202 , the shaft opening 204 and the partition opening 208 are circular in shape, although of different sizes.
- the bottom support 230 defines the air outlet 214 , which is shown as a large rectangular opening at the bottom of the housing 200 .
- the side housing wall 228 and rear housing wall 222 define the particulate removal ports 218 . As shown in FIGS. 4 and 5 , the particulate removal ports 218 are circular openings in the side housing wall 228 and rear housing wall 222 .
- the particulate removal ports 218 is formed substantially perpendicular to the central axis 408 and at least another particulate removal port 218 is formed substantially parallel to the central axis 408 .
- the particulate removal conduits 232 extend around and outwardly from the particulate removal ports 218 in the side housing wall 228 and rear housing wall 222 . As shown in FIGS. 4 and 5 , the particulate removal conduits 232 have a cylindrical shape and extend outwardly from the housing 200 to lead away the particulates removed from the air.
- the front housing wall 220 , rear housing wall 222 , side housing wall 228 and bottom support 230 are connected together to delimit an interior space of the housing 200 .
- the side housing wall 228 is disposed between the front housing wall 220 and rear housing wall 222 and is connected to the perimeter edges of the front housing wall 220 and rear housing wall 222 .
- the bottom support 230 is also disposed between the front housing wall 220 and rear housing wall 222 and is connected to the bottom edges of the front housing wall 220 and rear housing wall 222 .
- partition wall 224 is disposed inside the interior space of the housing between the front housing wall 220 and the rear housing wall 222 , to delimit the main air chamber 210 and the debris chamber 212 of the housing 200 .
- the perimeter edge of the partition wall 224 is connected to the side housing wall 228 .
- a debris chamber wall 226 is disposed between the partition wall 224 and the rear housing wall 222 around the perimeter edge of the partition wall 224 .
- the front housing wall 220 , partition wall 224 and side housing wall 228 define the main air chamber 210 .
- the rear housing wall 222 , partition wall 224 , debris chamber wall 226 and side housing wall 228 define the debris chamber 212 .
- the partition wall 224 and debris chamber wall 226 completely separate the debris chamber 212 from the main air chamber 210 , except for the connection of the debris chamber 212 and the main air chamber 210 through the partition opening 208 in the partition wall 224 .
- the front housing wall 220 , rear housing wall 222 and side housing wall 228 are shaped and configured to form the housing 200 in a generally volute shape 234 .
- the generally volute shape 234 includes a circular portion 238 and a tail portion 240 .
- the air outlet 214 defined by the bottom support 230 is arranged at the bottom of the tail portion 240 . Which side of the circular portion 238 the tail portion 240 is formed is a matter of design choice when constructing an extraction blower 10 depending on the intended direction of rotation of the impeller 400 .
- the side housing wall 228 may define an access opening that may be covered by an access panel.
- the access opening permits servicing and cleaning of the housing 200 , hood 300 and impeller 400 without requiring significant disassembly of the extraction blower 10 .
- the hood 300 defines an air inlet chamber 302 , an air inlet 304 , an extension opening 308 and an access opening 310 .
- the hood 300 comprises a front hood wall 312 , a rear hood wall 314 , an extension lip 318 , a side hood wall 320 , a grate 322 and an access panel 324 .
- the side hood wall 320 is positioned between the front hood wall 312 and the rear hood wall 314 , and is connected to the perimeter edges of the front hood wall 312 and the rear hood wall 314 to define the air inlet chamber 302 .
- Collectively, the bottom edges of the front hood wall 312 , rear hood wall 314 and side hood wall 320 define the air inlet 304 for allowing air to enter the air inlet chamber 302 .
- the side hood wall 320 is configured to form a rounded top opposite the air inlet 304 .
- the grate 322 is positioned at the air inlet 304 to prevent large debris from entering the extraction blower 10 during operation.
- the rear hood wall 314 defines the extension opening 308 .
- the extension lip 318 is disposed around the extension opening 308 and extends from the rear hood wall 314 in a direction away from the front hood wall 312 .
- the front hood wall 312 defines the access opening 310 , which is covered by access panel 324 .
- the hood 300 is configured to be connected to the housing 200 so that the rear hood wall 314 abuts the front housing wall 220 .
- the extension opening 308 of the hood 300 and the air intake opening 202 of the housing 200 are configured and sized to connect with each other when the hood 300 is connected to the housing 200 .
- the extension opening 308 of the hood 300 and the air intake opening 202 of the housing 200 are configured, so that the extension lip 318 of the hood 300 extends into the main air chamber 210 of the housing 200 when the hood 300 is connected to the housing 200 .
- the extension lip 318 is rounded and causes the air to more efficiently flow from the air inlet chamber 302 of the hood 300 toward the impeller 400 disposed in the housing 200 .
- FIG. 3 shows a cutaway view into the interior space of the hood 300 .
- connection of the hood 300 to the housing 200 may be accomplished by connections 330 that connect the rear hood wall 314 to the front housing wall 220 from the interior of the hood 300 .
- An advantage of having the connections 330 disposed on the rear hood wall 314 inside the hood 300 , rather than on an external flange, is that the dimensions of the rear hood wall 314 can be made large relative to the front housing wall 220 , because there is no need to accommodate an external flange for the connections 330 .
- a desired internal volume of the air inlet chamber 302 may be achieved with a shorter depth, which makes the hood 300 more compact.
- internal connections 330 are shown as bolt attachments, it should be understood that the internal connections 330 may be of other connection types as known by those of ordinary skill in the art, including without limitation screws, rivets, or clasps. Further, while a specific number of internal connections 330 are shown, it should be understood that in accordance with the present disclosure the number of internal connections 330 may vary to be greater or lesser in number.
- FIG. 1 shows the access panel 324 detached from the front hood wall 312 so that the access opening 310 is visible. Similar to the access opening and access panel that the side housing wall 228 may accommodate as described above, the access panel 324 allows servicing and cleaning of the impeller 400 , main air chamber 210 and debris chamber 212 without having to remove the hood 300 . While the access panel 324 is shown in FIG. 1 as being rectangular in shape, it should be understood that the access panel 324 may be any suitable shape, including without limitation a square, an oval, or a circle. The access panel 324 can be attached to the front hood wall 312 through the use of access panel bolts 328 .
- the access panel 324 is sized to entirely cover the access opening 310 when the access panel 324 is attached to the front hood wall 312 .
- the access panel 324 can be mounted to the front hood wall 312 in different manners, including screws, latches, clasps, magnets, hooks, sliding retention members, and/or other fasteners known to those of ordinary skill in the art.
- the access panel 324 can be mounted with a hinge to make the access panel “door-like” in the respect that it can reveal the access opening 310 by moving the access panel 324 from a closed position where the access opening 310 is completely covered to an open position where the access opening is revealed.
- the access panel 324 may be configured to completely cover the access opening 310 in such a way so as to prevent air flow through the access opening 310 , i.e., configured to be “air-tight.” This may be accomplished through a tight fitting of the access panel 324 to the front hood wall 312 and/or through the use of rubber seals or gaskets disposed between the access panel 324 and the front hood wall 312 or in other ways as known by those of ordinary skill in the art.
- the impeller 400 defines a front end opening 402 , a shaft channel 404 , a central axis 408 and a plurality of notches 410 .
- the impeller 400 comprises a base plate 412 , a collar 414 , front-facing blades 418 , a top plate 420 , rear-facing blades 422 and diverters 424 .
- the base plate 412 has a flat ring shape that defines a base plate opening 413 .
- the collar 414 has a tubular shape that defines a central bore 415 .
- One side of each of the front-facing blades 418 is connected to the front side of the base plate 412 .
- the front-facing blades 418 are connected to the base plate 412 along different radii and are evenly angularly spaced around the base plate 412 .
- On another side opposite the side connected to the base plate 412 each of the front-facing blades 418 is connected to the back side of the top plate 420 .
- the top plate 420 also has a flat ring shape and defines a top plate opening 421 .
- the front-facing blades 418 are connected to the top plate 420 along different radii and are evenly angularly spaced around the top plate 420 . Accordingly, the front-facing blades 418 are disposed between the base plate 412 and the top plate 420 and extend transversely to the planes of both the base plate 412 and the top plate 420 .
- Each of the front-facing blades 418 is planar and comprises a base edge 430 , a top edge 432 , an inner edge 434 , a curvilinear edge 436 , an outer edge 438 , a notch 410 and a hole 428 .
- the base edge 430 is disposed opposite and parallel to the top edge 432 .
- the inner edge 434 and curvilinear edge 436 are disposed between the base edge 430 and the top edge 432 in the region of the front-facing blade 418 that is disposed radially inward toward the central axis 408 of the impeller 400 .
- the inner edge 434 is straight and extends perpendicularly from the base edge 430 toward the top edge 432 .
- the curvilinear edge 436 extends from the end of the inner edge 434 to the top edge 432 .
- the inner edge 434 and curvilinear edge 436 together connect the base edge 430 and the top edge 432 .
- the outer edge 438 disposed between the base edge 430 and the top edge 432 in the region of the front-facing blade 418 that is disposed radially outward away from the central axis 408 of the impeller 400 .
- the outer edge 438 defines a notch 410 in the corner of the front-facing blade 418 adjacent the base edge 430 .
- the notches 410 in each of the front-facing blades 418 can be said to give the impeller 400 a “stepped construction,” which allows the full diameter of the impeller blades to be disposed in the main air chamber 210 and a reduced diameter of the impeller blades to be disposed in the debris chamber 212
- notches 410 are shown as rectangular in shape, it should be readily understood that the notches 410 may take on any other suitable shape.
- Adjacent to the outer edge 438 are disposed holes 428 configured to receive weights (e.g., bolts) for balancing rotation of the impeller 400 .
- the tubular collar 414 is connected to the front side of the base plate 412 extending transversely to the plane of the base plate 412 such that the longitudinal axis of the central bore 415 runs along the central axis 408 of the impeller 400 .
- the radius of the central bore 415 of the collar 414 is sized and configured to match the radius of the circular base plate opening 413 in the base plate 412 , so that the base plate opening 413 and the central bore 415 define the shaft channel 404 that accepts the rotating output shaft of the motor 100 .
- the central axis 408 runs through the shaft channel 404 and is substantially perpendicular to the plane of the base plate 412 .
- the impeller 400 is configured to rotate about the central axis 408 .
- the base edge 430 of each of the front-facing blades 418 is connected to the front face of the base plate 412 . Accordingly, as shown, the length of the base edge 430 is preferably the same as the radial dimension of the annulus of the base plate 412 .
- the inner edge 434 of each of the front-facing blades 418 is connected to the side of the collar 414 . Accordingly, as shown, the length of the inner edge 434 is preferably the same as the length of the tubular collar 414 .
- the top edge 432 of each of the front-facing blades 418 is connected to the back face of the top plate 420 .
- the length of the top edge 432 is preferably the same as the radial dimension of the annulus of the top plate 420 .
- the top plate opening 421 defines the front end opening 402 of the impeller 400 .
- the radius of the top plate opening 421 is large compared to the radius of the base plate opening 413 .
- the top plate opening 421 is the opening through which air is drawn into the housing 200 by impeller 400
- the base plate opening 413 is the opening that accommodates the rotating output shaft of motor 100 .
- the rear-facing blades 422 are disposed on the back side of the base plate 412 opposite the front-facing blades 418 and are radially aligned with the front-facing blades 418 . Accordingly, as shown in FIGS. 7 and 8 , the number of rear-facing blades 422 is the same as the number of front-facing blades 418 .
- the rear-facing blades 422 have a generally triangular shape. Each of the rear-facing blades 422 is disposed on the rear side of the base plate 412 so that the rear-facing blade 422 tapers in a radially inward direction toward the central axis 408 of the impeller 400 .
- the diverters 424 are disposed on one side of each of the front-facing blades 418 , preferably perpendicularly to the plane of the front-facing blades 418 .
- the diverters 424 are disposed on the side of the front-facing blades 418 that leads relative to the rotation of the impeller 400 (i.e., the leading side, not the trailing side). Thus, which side of the front-facing blades 418 the diverters are disposed on depends on the direction of the rotation of the impeller 400 .
- the diverters 424 have a generally planar rectangular shape.
- a first end 440 of the diverter 424 is disposed adjacent to the junction of the top edge 432 and curvilinear edge 436 of the front-facing blade 418
- a second end 442 of the diverter 424 is disposed adjacent to the notch 410 of the front-facing blade 418 .
- the first end 440 is radially closer to the central axis 408 than the second end 442 , such that the diverter is inclined toward the central axis 408 .
- the impeller 400 is disposed inside the housing 200 so that the top plate 420 is positioned in the main air chamber 210 and the base plate 412 is positioned in the debris chamber 212 .
- the notches 410 of the front-facing blades 418 accommodate the partition wall 224 so that the partition wall 224 extends radially inward (toward the central axis 408 ) of the most radially outward portion of the outer edge 438 of each of the front-facing blades 418 .
- a portion of the front-facing blades 418 are disposed in the main air chamber 210 on one side of the partition wall 224 and another portion of the front-facing blades 418 are disposed in the debris chamber 212 on the other side of the partition wall 224 .
- the housing 200 and the impeller 400 are sized and configured so that the front end opening 402 of the impeller 400 is disposed adjacent to the air intake opening 202 of the housing 200 so that air can flow from the air inlet chamber 302 of the hood 300 toward the main air chamber 210 of the housing 200 .
- the outermost radius of the top plate 420 is about the same as the radius of the air intake opening 202 .
- the housing 200 and the impeller 400 are sized and configured so that the shaft channel 404 of the impeller 400 is disposed adjacent to the shaft opening 204 of the housing 200 .
- the radius of the shaft channel 404 is about the same as the radius of the shaft opening 204 to accommodate the rotating output shaft of the motor 100 that extends through the shaft opening 204 of the housing 200 and into the shaft channel 404 of the impeller 400 .
- the motor 100 drives an output shaft (not shown) that causes the impeller 400 to rotate within the housing 200 .
- the rotation of the impeller 400 causes air from outside of the extraction blower 10 to flow through the air inlet 304 and then into the air inlet chamber 302 .
- One purpose of the grate 322 being positioned at the air inlet 304 is to prevent relatively large sized particulates from entering the extraction blower 10 during operation.
- the air then flows through the extension opening 308 and through the air intake opening 202 of the housing 200 .
- the extension lip 318 causes the air to more efficiently flow from the air inlet chamber 302 of the hood 300 toward the impeller 400 disposed in the housing 200 .
- the air then flows through the front end opening 402 of the impeller 400 inside the main air chamber 210 .
- debris in the air may enter the front end opening 402 of the impeller 400 and move directly into the debris chamber and hit the base plate 412 or, alternatively, debris in the air may hit the front-facing blades 418 in the main air chamber 210 .
- the debris in the air hits the front-facing blades 418 , it is guided by the diverters 424 from the main air chamber 210 toward the debris chamber 212 .
- the angular momentum imparted to the particulates by rotation of the front-facing blades 418 , the base plate 412 and/or the air flow in the housing 200 generated by the impeller 400 causes the particulates to move radially outward along or near the base plate 412 and eventually to exit the debris chamber 212 through one of the particulate removal ports 218 and its respective particulate removal conduit 232 to an area outside of the extraction blower 10 .
- debris is removed from the air in the main air chamber 210 and the clean air flows through the air outlet 214 to an area outside of the extraction blower 10 .
- the particulate removal port 218 that is formed substantially perpendicular to the central axis 408 is formed in side of housing 200 so as to be substantially in alignment with an air flow generated by the impeller 400 during operation.
- An advantage of having at least one particulate removal port 218 formed in the side of the housing 200 substantially in alignment with a generated air flow is that moving particulates are not required to change direction in their travel path in order to exit the debris chamber 212 . This arrangement allows for a relatively quick and efficient exit of the particulates from the debris chamber 212 .
- the particulate removal ports 218 are formed relatively low in the debris chamber 212 in order to naturally serve as a drain for moisture and water even when the extraction blower 10 is not in operation.
- the particulate removal ports 218 may be formed additionally and/or alternatively elsewhere in the debris chamber as well.
- the rear-facing blades 422 mounted or connected on the rear side of the base plate 412 advantageously impart more air flow into the debris chamber 212 , which thereby supports more particulates and/or greater chance for particulates to eventually exit through one of the particulate removal ports 218 instead of the air outlet 214 .
- the impeller 400 of an exemplary extraction blower 10 has been shown with the rear-facing blades 422 generally aligning with the front-facing blades 418 on the opposite side of the base plate 412 , e.g. as seen in FIG. 8 , it should be understood that in accordance with principles of the present disclosure that the rear-facing blades 422 can be staggered so as to not align with the front-facing blades 418 on the opposite side of the base plate 412 .
- the drawings show an embodiment having six front-facing blades 418 and six rear-facing blades 422 , it should be understood that there may be a larger or smaller number of front-facing blades 418 and rear-facing blades 422 .
- the number of rear-facing blades 422 is the same as the number of front-facing blades 418 , it should be understood that that the number of rear-facing blades 422 may be different than the number of front-facing blades 418 .
- the holes 428 on the impeller 400 provide an optional means for balancing the impeller 400 . While the holes 428 are shown near the stepped construction of the front-facing blades 418 , it should be understood that the holes 428 can be formed in other areas of the front-facing blades 418 as an alternative or in addition to the shown holes 428 .
- the present disclosure advantageously describes an extraction blower 10 that can be suitably modified for a wide range of extraction blower 10 sizes and/or motor 100 capacities.
- embodiments in accordance with the present disclosure are advantageously scalable in size to achieve a variety of different applications.
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Abstract
An extraction blower having a housing having a main air chamber, a debris chamber and a particulate removal port connected to the debris chamber, an impeller configured to rotate within the housing about a central axis and having a base plate positioned in the debris chamber, a plurality of front-facing blades mounted on a front side of the base plate and a plurality of rear-facing blades mounted on a rear side of the base plate.
Description
- The present disclosure relates generally to blowers and, more particularly, to extraction blowers for separating solids and/or liquids from an air source.
- Extraction blowers may be used to blow air obtained from the atmosphere to cool and/or ventilate structures or equipment. The air obtained from the atmosphere may contain solid and/or liquid particles. Thus, extraction blowers are utilized to remove at least some of the solid and/or liquid particles from the obtained atmospheric air to thereby deliver “clean” air for the process of cooling and/or ventilating structures or equipment.
- According to the present disclosure, an extraction blower comprises a housing having a main air chamber, a debris chamber and a particulate removal port connected to the debris chamber, an impeller configured to rotate within the housing about a central axis and having a base plate disposed in the debris chamber and a top plate disposed in the main air chamber, a plurality of front-facing blades mounted on a front side of the base plate between the base plate and the top plate, and a plurality of rear-facing blades mounted on a rear side of the base plate.
- These and other aspects, features and advantages of the present disclosure will become apparent in light of the following detailed description of non-limiting embodiments, with reference to the accompanying drawings.
-
FIG. 1 is a perspective view of an exemplary extraction blower; -
FIG. 2 is a rear view of an exemplary extraction blower; -
FIG. 3 is a cutaway view of the interior space of the hood of an exemplary extraction blower; -
FIG. 4 is a cutaway, perspective view of a housing with an impeller of an exemplary extraction blower; -
FIG. 5 is another cutaway, perspective view of a housing with an impeller of an exemplary extraction blower; -
FIG. 6 is a bottom view of an exemplary extraction blower; -
FIG. 7 is a side view of an exemplary impeller; and -
FIG. 8 is a perspective view of an exemplary impeller. - Before the various embodiments are described in further detail, it is to be understood that the invention is not limited to the particular embodiments described. It will be understood by one of ordinary skill in the art that the devices described herein may be adapted and modified as is appropriate for the application being addressed and that the devices described herein may be employed in other suitable applications, and that such other additions and modifications will not depart from the scope thereof.
- Although various features have been shown in different figures for simplicity, it should be readily apparent to one of skill in the art that the various features may be combined without departing from the scope of the present disclosure.
- With reference to
FIGS. 1-3 , an extraction blower is shown according to an embodiment of the present disclosure. Theextraction blower 10 comprises amotor 100, ahousing 200, ahood 300 and animpeller 400 configured to be driven by themotor 100 and configured to rotate within thehousing 200. Themotor 100 of theextraction blower 10 may be an electric motor comprising a rotating output shaft (not shown). - Referring to
FIGS. 4 and 5 , thehousing 200 defines anair intake opening 202, ashaft opening 204, apartition opening 208, amain air chamber 210, adebris chamber 212, anair outlet 214 andparticulate removal ports 218. Thehousing 200 comprises afront housing wall 220, arear housing wall 222, apartition wall 224, aside housing wall 228, abottom support 230 andparticulate removal conduits 232. - The
front housing wall 220 defines theair intake opening 202. Therear housing wall 222 defines the shaft opening 204. Thepartition wall 224 defines thepartition opening 208. As shown inFIGS. 4 and 5 , the air intake opening 202, the shaft opening 204 and thepartition opening 208 are circular in shape, although of different sizes. Thebottom support 230 defines theair outlet 214, which is shown as a large rectangular opening at the bottom of thehousing 200. Theside housing wall 228 andrear housing wall 222 define theparticulate removal ports 218. As shown inFIGS. 4 and 5 , theparticulate removal ports 218 are circular openings in theside housing wall 228 andrear housing wall 222. As shown, at least one of theparticulate removal ports 218 is formed substantially perpendicular to thecentral axis 408 and at least anotherparticulate removal port 218 is formed substantially parallel to thecentral axis 408. Theparticulate removal conduits 232 extend around and outwardly from theparticulate removal ports 218 in theside housing wall 228 andrear housing wall 222. As shown inFIGS. 4 and 5 , theparticulate removal conduits 232 have a cylindrical shape and extend outwardly from thehousing 200 to lead away the particulates removed from the air. - As shown in
FIGS. 4 and 5 , thefront housing wall 220,rear housing wall 222,side housing wall 228 andbottom support 230 are connected together to delimit an interior space of thehousing 200. Theside housing wall 228 is disposed between thefront housing wall 220 andrear housing wall 222 and is connected to the perimeter edges of thefront housing wall 220 andrear housing wall 222. Thebottom support 230 is also disposed between thefront housing wall 220 andrear housing wall 222 and is connected to the bottom edges of thefront housing wall 220 andrear housing wall 222. Further, thepartition wall 224 is disposed inside the interior space of the housing between thefront housing wall 220 and therear housing wall 222, to delimit themain air chamber 210 and thedebris chamber 212 of thehousing 200. The perimeter edge of thepartition wall 224 is connected to theside housing wall 228. Further, adebris chamber wall 226 is disposed between thepartition wall 224 and therear housing wall 222 around the perimeter edge of thepartition wall 224. - Collectively, the
front housing wall 220,partition wall 224 andside housing wall 228 define themain air chamber 210. Collectively, therear housing wall 222,partition wall 224,debris chamber wall 226 andside housing wall 228 define thedebris chamber 212. Thepartition wall 224 anddebris chamber wall 226 completely separate thedebris chamber 212 from themain air chamber 210, except for the connection of thedebris chamber 212 and themain air chamber 210 through thepartition opening 208 in thepartition wall 224. - The
front housing wall 220,rear housing wall 222 andside housing wall 228 are shaped and configured to form thehousing 200 in a generallyvolute shape 234. As shown inFIGS. 2, 4 and 5 , the generallyvolute shape 234 includes acircular portion 238 and atail portion 240. Theair outlet 214 defined by thebottom support 230 is arranged at the bottom of thetail portion 240. Which side of thecircular portion 238 thetail portion 240 is formed is a matter of design choice when constructing anextraction blower 10 depending on the intended direction of rotation of theimpeller 400. - While not shown in the drawings, the
side housing wall 228 may define an access opening that may be covered by an access panel. The access opening permits servicing and cleaning of thehousing 200,hood 300 andimpeller 400 without requiring significant disassembly of theextraction blower 10. - Referring to
FIGS. 1 and 3 , thehood 300 defines anair inlet chamber 302, anair inlet 304, anextension opening 308 and anaccess opening 310. Thehood 300 comprises afront hood wall 312, arear hood wall 314, anextension lip 318, aside hood wall 320, agrate 322 and anaccess panel 324. - The
side hood wall 320 is positioned between thefront hood wall 312 and therear hood wall 314, and is connected to the perimeter edges of thefront hood wall 312 and therear hood wall 314 to define theair inlet chamber 302. Collectively, the bottom edges of thefront hood wall 312,rear hood wall 314 andside hood wall 320 define theair inlet 304 for allowing air to enter theair inlet chamber 302. Theside hood wall 320 is configured to form a rounded top opposite theair inlet 304. Thegrate 322 is positioned at theair inlet 304 to prevent large debris from entering theextraction blower 10 during operation. Therear hood wall 314 defines theextension opening 308. Theextension lip 318 is disposed around the extension opening 308 and extends from therear hood wall 314 in a direction away from thefront hood wall 312. Thefront hood wall 312 defines theaccess opening 310, which is covered byaccess panel 324. - The
hood 300 is configured to be connected to thehousing 200 so that therear hood wall 314 abuts thefront housing wall 220. As shown inFIGS. 1 and 3 , the extension opening 308 of thehood 300 and the air intake opening 202 of thehousing 200 are configured and sized to connect with each other when thehood 300 is connected to thehousing 200. In particular, the extension opening 308 of thehood 300 and the air intake opening 202 of thehousing 200 are configured, so that theextension lip 318 of thehood 300 extends into themain air chamber 210 of thehousing 200 when thehood 300 is connected to thehousing 200. Theextension lip 318 is rounded and causes the air to more efficiently flow from theair inlet chamber 302 of thehood 300 toward theimpeller 400 disposed in thehousing 200. -
FIG. 3 shows a cutaway view into the interior space of thehood 300. As shown inFIG. 3 , connection of thehood 300 to thehousing 200 may be accomplished byconnections 330 that connect therear hood wall 314 to thefront housing wall 220 from the interior of thehood 300. An advantage of having theconnections 330 disposed on therear hood wall 314 inside thehood 300, rather than on an external flange, is that the dimensions of therear hood wall 314 can be made large relative to thefront housing wall 220, because there is no need to accommodate an external flange for theconnections 330. Thus, a desired internal volume of theair inlet chamber 302 may be achieved with a shorter depth, which makes thehood 300 more compact. While theinternal connections 330 are shown as bolt attachments, it should be understood that theinternal connections 330 may be of other connection types as known by those of ordinary skill in the art, including without limitation screws, rivets, or clasps. Further, while a specific number ofinternal connections 330 are shown, it should be understood that in accordance with the present disclosure the number ofinternal connections 330 may vary to be greater or lesser in number. -
FIG. 1 shows theaccess panel 324 detached from thefront hood wall 312 so that the access opening 310 is visible. Similar to the access opening and access panel that theside housing wall 228 may accommodate as described above, theaccess panel 324 allows servicing and cleaning of theimpeller 400,main air chamber 210 anddebris chamber 212 without having to remove thehood 300. While theaccess panel 324 is shown inFIG. 1 as being rectangular in shape, it should be understood that theaccess panel 324 may be any suitable shape, including without limitation a square, an oval, or a circle. Theaccess panel 324 can be attached to thefront hood wall 312 through the use ofaccess panel bolts 328. Theaccess panel 324 is sized to entirely cover the access opening 310 when theaccess panel 324 is attached to thefront hood wall 312. Instead ofaccess panel bolts 328, it should be readily understood that theaccess panel 324 can be mounted to thefront hood wall 312 in different manners, including screws, latches, clasps, magnets, hooks, sliding retention members, and/or other fasteners known to those of ordinary skill in the art. Alternatively, theaccess panel 324 can be mounted with a hinge to make the access panel “door-like” in the respect that it can reveal the access opening 310 by moving theaccess panel 324 from a closed position where the access opening 310 is completely covered to an open position where the access opening is revealed. Theaccess panel 324 may be configured to completely cover the access opening 310 in such a way so as to prevent air flow through the access opening 310, i.e., configured to be “air-tight.” This may be accomplished through a tight fitting of theaccess panel 324 to thefront hood wall 312 and/or through the use of rubber seals or gaskets disposed between theaccess panel 324 and thefront hood wall 312 or in other ways as known by those of ordinary skill in the art. - Referring to
FIGS. 7 and 8 , theimpeller 400 defines afront end opening 402, ashaft channel 404, acentral axis 408 and a plurality ofnotches 410. Theimpeller 400 comprises abase plate 412, acollar 414, front-facingblades 418, atop plate 420, rear-facingblades 422 anddiverters 424. - The
base plate 412 has a flat ring shape that defines abase plate opening 413. Thecollar 414 has a tubular shape that defines acentral bore 415. One side of each of the front-facingblades 418 is connected to the front side of thebase plate 412. The front-facingblades 418 are connected to thebase plate 412 along different radii and are evenly angularly spaced around thebase plate 412. On another side opposite the side connected to thebase plate 412, each of the front-facingblades 418 is connected to the back side of thetop plate 420. Thetop plate 420 also has a flat ring shape and defines a top plate opening 421. The front-facingblades 418 are connected to thetop plate 420 along different radii and are evenly angularly spaced around thetop plate 420. Accordingly, the front-facingblades 418 are disposed between thebase plate 412 and thetop plate 420 and extend transversely to the planes of both thebase plate 412 and thetop plate 420. - Each of the front-facing
blades 418 is planar and comprises abase edge 430, atop edge 432, aninner edge 434, acurvilinear edge 436, anouter edge 438, anotch 410 and ahole 428. As shown inFIG. 7 , thebase edge 430 is disposed opposite and parallel to thetop edge 432. Theinner edge 434 andcurvilinear edge 436 are disposed between thebase edge 430 and thetop edge 432 in the region of the front-facingblade 418 that is disposed radially inward toward thecentral axis 408 of theimpeller 400. Theinner edge 434 is straight and extends perpendicularly from thebase edge 430 toward thetop edge 432. Thecurvilinear edge 436 extends from the end of theinner edge 434 to thetop edge 432. Thus, theinner edge 434 andcurvilinear edge 436 together connect thebase edge 430 and thetop edge 432. Theouter edge 438 disposed between thebase edge 430 and thetop edge 432 in the region of the front-facingblade 418 that is disposed radially outward away from thecentral axis 408 of theimpeller 400. Theouter edge 438 defines anotch 410 in the corner of the front-facingblade 418 adjacent thebase edge 430. Thenotches 410 in each of the front-facingblades 418 can be said to give the impeller 400 a “stepped construction,” which allows the full diameter of the impeller blades to be disposed in themain air chamber 210 and a reduced diameter of the impeller blades to be disposed in thedebris chamber 212 Although,notches 410 are shown as rectangular in shape, it should be readily understood that thenotches 410 may take on any other suitable shape. Adjacent to theouter edge 438 are disposedholes 428 configured to receive weights (e.g., bolts) for balancing rotation of theimpeller 400. - The
tubular collar 414 is connected to the front side of thebase plate 412 extending transversely to the plane of thebase plate 412 such that the longitudinal axis of thecentral bore 415 runs along thecentral axis 408 of theimpeller 400. The radius of thecentral bore 415 of thecollar 414 is sized and configured to match the radius of the circular base plate opening 413 in thebase plate 412, so that the base plate opening 413 and thecentral bore 415 define theshaft channel 404 that accepts the rotating output shaft of themotor 100. Thecentral axis 408 runs through theshaft channel 404 and is substantially perpendicular to the plane of thebase plate 412. Theimpeller 400 is configured to rotate about thecentral axis 408. - The
base edge 430 of each of the front-facingblades 418 is connected to the front face of thebase plate 412. Accordingly, as shown, the length of thebase edge 430 is preferably the same as the radial dimension of the annulus of thebase plate 412. Theinner edge 434 of each of the front-facingblades 418 is connected to the side of thecollar 414. Accordingly, as shown, the length of theinner edge 434 is preferably the same as the length of thetubular collar 414. Thetop edge 432 of each of the front-facingblades 418 is connected to the back face of thetop plate 420. Accordingly, as shown, the length of thetop edge 432 is preferably the same as the radial dimension of the annulus of thetop plate 420. As shown inFIGS. 7 and 8 , the top plate opening 421 defines the front end opening 402 of theimpeller 400. As shown, the radius of the top plate opening 421 is large compared to the radius of thebase plate opening 413. The top plate opening 421 is the opening through which air is drawn into thehousing 200 byimpeller 400, whereas the base plate opening 413 is the opening that accommodates the rotating output shaft ofmotor 100. - As shown, the rear-facing
blades 422 are disposed on the back side of thebase plate 412 opposite the front-facingblades 418 and are radially aligned with the front-facingblades 418. Accordingly, as shown inFIGS. 7 and 8 , the number of rear-facingblades 422 is the same as the number of front-facingblades 418. The rear-facingblades 422 have a generally triangular shape. Each of the rear-facingblades 422 is disposed on the rear side of thebase plate 412 so that the rear-facingblade 422 tapers in a radially inward direction toward thecentral axis 408 of theimpeller 400. - The
diverters 424 are disposed on one side of each of the front-facingblades 418, preferably perpendicularly to the plane of the front-facingblades 418. Thediverters 424 are disposed on the side of the front-facingblades 418 that leads relative to the rotation of the impeller 400 (i.e., the leading side, not the trailing side). Thus, which side of the front-facingblades 418 the diverters are disposed on depends on the direction of the rotation of theimpeller 400. Thediverters 424 have a generally planar rectangular shape. As shown, afirst end 440 of thediverter 424 is disposed adjacent to the junction of thetop edge 432 andcurvilinear edge 436 of the front-facingblade 418, and asecond end 442 of thediverter 424 is disposed adjacent to thenotch 410 of the front-facingblade 418. As shown inFIG. 7 thefirst end 440 is radially closer to thecentral axis 408 than thesecond end 442, such that the diverter is inclined toward thecentral axis 408. - As shown in
FIGS. 4 and 5 , theimpeller 400 is disposed inside thehousing 200 so that thetop plate 420 is positioned in themain air chamber 210 and thebase plate 412 is positioned in thedebris chamber 212. Thenotches 410 of the front-facingblades 418 accommodate thepartition wall 224 so that thepartition wall 224 extends radially inward (toward the central axis 408) of the most radially outward portion of theouter edge 438 of each of the front-facingblades 418. Accordingly, as shown, a portion of the front-facingblades 418 are disposed in themain air chamber 210 on one side of thepartition wall 224 and another portion of the front-facingblades 418 are disposed in thedebris chamber 212 on the other side of thepartition wall 224. - As shown in
FIGS. 4 and 5 , thehousing 200 and theimpeller 400 are sized and configured so that the front end opening 402 of theimpeller 400 is disposed adjacent to theair intake opening 202 of thehousing 200 so that air can flow from theair inlet chamber 302 of thehood 300 toward themain air chamber 210 of thehousing 200. As shown, the outermost radius of thetop plate 420 is about the same as the radius of theair intake opening 202. Also, as shown inFIGS. 4 and 5 , thehousing 200 and theimpeller 400 are sized and configured so that theshaft channel 404 of theimpeller 400 is disposed adjacent to theshaft opening 204 of thehousing 200. As shown, the radius of theshaft channel 404 is about the same as the radius of theshaft opening 204 to accommodate the rotating output shaft of themotor 100 that extends through theshaft opening 204 of thehousing 200 and into theshaft channel 404 of theimpeller 400. - In operation, the
motor 100 drives an output shaft (not shown) that causes theimpeller 400 to rotate within thehousing 200. The rotation of theimpeller 400 causes air from outside of theextraction blower 10 to flow through theair inlet 304 and then into theair inlet chamber 302. One purpose of thegrate 322 being positioned at theair inlet 304 is to prevent relatively large sized particulates from entering theextraction blower 10 during operation. The air then flows through theextension opening 308 and through theair intake opening 202 of thehousing 200. Theextension lip 318 causes the air to more efficiently flow from theair inlet chamber 302 of thehood 300 toward theimpeller 400 disposed in thehousing 200. The air then flows through the front end opening 402 of theimpeller 400 inside themain air chamber 210. As air enters thehousing 200, debris in the air may enter the front end opening 402 of theimpeller 400 and move directly into the debris chamber and hit thebase plate 412 or, alternatively, debris in the air may hit the front-facingblades 418 in themain air chamber 210. As the debris in the air hits the front-facingblades 418, it is guided by thediverters 424 from themain air chamber 210 toward thedebris chamber 212. Once the particulates have reached thedebris chamber 212, the angular momentum imparted to the particulates by rotation of the front-facingblades 418, thebase plate 412 and/or the air flow in thehousing 200 generated by theimpeller 400 causes the particulates to move radially outward along or near thebase plate 412 and eventually to exit thedebris chamber 212 through one of theparticulate removal ports 218 and its respectiveparticulate removal conduit 232 to an area outside of theextraction blower 10. Thus, by rotation of theimpeller 400, debris is removed from the air in themain air chamber 210 and the clean air flows through theair outlet 214 to an area outside of theextraction blower 10. - The
particulate removal port 218 that is formed substantially perpendicular to thecentral axis 408 is formed in side ofhousing 200 so as to be substantially in alignment with an air flow generated by theimpeller 400 during operation. An advantage of having at least oneparticulate removal port 218 formed in the side of thehousing 200 substantially in alignment with a generated air flow is that moving particulates are not required to change direction in their travel path in order to exit thedebris chamber 212. This arrangement allows for a relatively quick and efficient exit of the particulates from thedebris chamber 212. It is also advantageous that theparticulate removal ports 218 are formed relatively low in thedebris chamber 212 in order to naturally serve as a drain for moisture and water even when theextraction blower 10 is not in operation. However, it should be readily understood that theparticulate removal ports 218 may be formed additionally and/or alternatively elsewhere in the debris chamber as well. - The rear-facing
blades 422 mounted or connected on the rear side of thebase plate 412 advantageously impart more air flow into thedebris chamber 212, which thereby supports more particulates and/or greater chance for particulates to eventually exit through one of theparticulate removal ports 218 instead of theair outlet 214. - While the
impeller 400 of anexemplary extraction blower 10 has been shown with the rear-facingblades 422 generally aligning with the front-facingblades 418 on the opposite side of thebase plate 412, e.g. as seen inFIG. 8 , it should be understood that in accordance with principles of the present disclosure that the rear-facingblades 422 can be staggered so as to not align with the front-facingblades 418 on the opposite side of thebase plate 412. Moreover, while the drawings show an embodiment having six front-facingblades 418 and six rear-facingblades 422, it should be understood that there may be a larger or smaller number of front-facingblades 418 and rear-facingblades 422. Furthermore, while the number of rear-facingblades 422 is the same as the number of front-facingblades 418, it should be understood that that the number of rear-facingblades 422 may be different than the number of front-facingblades 418. - With reference to
FIGS. 7 and 8 , theholes 428 on theimpeller 400 provide an optional means for balancing theimpeller 400. While theholes 428 are shown near the stepped construction of the front-facingblades 418, it should be understood that theholes 428 can be formed in other areas of the front-facingblades 418 as an alternative or in addition to the shown holes 428. - The present disclosure advantageously describes an
extraction blower 10 that can be suitably modified for a wide range ofextraction blower 10 sizes and/ormotor 100 capacities. Thus, embodiments in accordance with the present disclosure are advantageously scalable in size to achieve a variety of different applications. - While the present disclosure has been illustrated and described with respect to particular embodiments thereof, it should be appreciated by those of ordinary skill in the art that various modifications to this disclosure may be made without departing from the spirit and scope of the present disclosure.
Claims (20)
1. An extraction blower comprising:
a housing having a main air chamber, a debris chamber and a particulate removal port connected to the debris chamber;
an impeller configured to rotate within the housing about a central axis and having a base plate positioned in the debris chamber;
a plurality of front-facing blades mounted on a front side of the base plate; and
a plurality of rear-facing blades mounted on a rear side of the base plate.
2. The extraction blower of claim 1 , wherein the particulate removal port is formed substantially toward a bottom end of the debris chamber.
3. The extraction blower of claim 1 , wherein the particulate removal port is formed substantially parallel to the direction of the central axis.
4. The extraction blower of claim 1 , wherein the particulate removal port is formed substantially perpendicular to the direction of the central axis.
5. The extraction blower of claim 1 , wherein the particulate removal port is formed substantially in alignment with an air flow generated by the impeller when in operation.
6. The extraction blower of claim 1 , wherein at least one of the front-facing blades has a hole formed therein.
7. The extraction blower of claim 1 , wherein each of the rear-facing blades extends furthest from the rear side of the base plate at the radially outer most part of the base plate from the central axis.
8. The extraction blower of claim 1 , wherein each of the rear-facing blades is triangle shaped.
9. The extraction blower of claim 1 , wherein the housing further comprises a partition positioned between the main air chamber and the debris chamber, and wherein the front-facing blades extend from the front side of the base plate and into the main air chamber.
10. The extraction blower of claim 9 , wherein the front-facing blades have a stepped construction whereby at least a portion of each of the front-facing blades is recessed radially inward, wherein another portion of each of the front-facing blades that is not recessed is positioned in the main air chamber and at least the portion of each of the front-facing blades that is recessed is positioned in the debris chamber and wherein the other portion of each of the front-facing blades that is not recessed extends a larger radial distance from the central axis than the portion of each of the front facing blades that is recessed.
11. The extraction blower of claim 1 , further comprising a diverter disposed on one of the front-facing blades and extending substantially perpendicularly from a planar surface of the front facing blade.
12. The extraction blower of claim 11 , wherein the diverter is disposed on a leading surface of one of the front-facing blades with respect to a direction of rotation of the impeller.
13. The extraction blower of claim 1 , further comprising a hood attached to the housing, wherein the hood defines an extension opening and an air inlet and wherein the hood comprises an extension lip disposed around the extension opening.
14. The extraction blower of claim 13 , wherein the hood comprises an access opening and an access panel mounted to the hood, and wherein the access panel is sized and shaped to completely cover the access opening.
15. The extraction blower of claim 13 , wherein the hood is connected to the housing with at least one internal connection disposed inside an interior space of the hood.
16. An extraction blower comprising:
a housing having a main air chamber, a debris chamber and at least two particulate removal ports connected to the debris chamber;
an impeller configured to rotate within the housing about a central axis and having a base plate positioned in the debris chamber; and
a plurality of front-facing blades mounted on a front side of the base plate.
17. The extraction blower of claim 16 , wherein at least one of the at least two particulate removal ports is formed to align with an air flow generated by the impeller when in operation.
18. The extraction blower of claim 16 , wherein a first particulate removal port of the at least two particulate removal ports is formed parallel to the direction of the central axis and a second particulate removal port is formed perpendicular to the direction of the central axis.
19. The extraction blower of claim 18 , wherein the first particulate removal port and the second particulate removal port are formed substantially towards a bottom end of the debris chamber.
20. An extraction blower comprising:
a housing having a main air chamber, a debris chamber and a particulate removal port connected to the debris chamber;
a partition connected to the housing and positioned between the main air chamber and the debris chamber;
a hood attached to the housing, wherein the hood defines an air inlet, an extension opening and an access opening;
an extension lip disposed around the extension opening;
an access panel mounted to the hood and completely covering the access opening;
an impeller configured to rotate within the housing about a central axis and having a base plate positioned in the debris chamber;
a plurality of front-facing blades mounted on a front side of the base plate;
a plurality of rear-facing blades mounted on a rear side of the base plate; and
a diverter formed on one of the front-facing blades and extending substantially perpendicularly from a planar surface of the front facing blade;
wherein at least one of the front-facing blades has a hole formed therein,
wherein the front-facing blades extend from the front side of the base plate and into the main air chamber, and
wherein the front-facing blades have a stepped construction whereby a first portion of the plurality of front facing blades disposed in the main air chamber extend a larger radial distance from the central axis than a second portion of the plurality of front facing blades disposed in the debris chamber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/132,576 US20170298959A1 (en) | 2016-04-19 | 2016-04-19 | Extraction blower |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/132,576 US20170298959A1 (en) | 2016-04-19 | 2016-04-19 | Extraction blower |
Publications (1)
Publication Number | Publication Date |
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US20170298959A1 true US20170298959A1 (en) | 2017-10-19 |
Family
ID=60038728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US15/132,576 Abandoned US20170298959A1 (en) | 2016-04-19 | 2016-04-19 | Extraction blower |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US11286949B2 (en) * | 2018-12-27 | 2022-03-29 | Sanyo Denki Co., Ltd. | Waterproof blower fan |
US11346358B2 (en) * | 2019-05-28 | 2022-05-31 | Mikuni Corporation | Impeller and centrifugal pump |
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