US3128940A - Capillary fans - Google Patents
Capillary fans Download PDFInfo
- Publication number
- US3128940A US3128940A US3128940DA US3128940A US 3128940 A US3128940 A US 3128940A US 3128940D A US3128940D A US 3128940DA US 3128940 A US3128940 A US 3128940A
- Authority
- US
- United States
- Prior art keywords
- ring
- backplate
- annular
- rotor
- fans
- 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.)
- Expired - Lifetime
Links
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 229920005830 Polyurethane Foam Polymers 0.000 description 9
- 239000011496 polyurethane foam Substances 0.000 description 9
- 239000002657 fibrous material Substances 0.000 description 6
- 230000004323 axial length Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011491 glass wool Substances 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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/167—Operating by means of fibrous or porous elements, e.g. with sponge rotors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S417/00—Pumps
- Y10S417/01—Materials digest
Definitions
- This invention uses as the air moving element of a centrifugal fan, an annular ring of sponge-like foamed plastic.
- sponge-like is meant a three dimensional network of skeletal strands integrally joined together and forming therebetween voids which occupy the major portion of the volume air space of the foamed plastic.
- a preferred material is polyurethane foam, the advantages of which are its low cost, its being easily removable from a fan rotor when it has become clogged with dirt, its being easily cleaned and replaced on the rotor, its lack of break-up during handling and use, and its having sufficient stiffness, while it is resilient, to be largely self supporting.
- An advantage over well known, so-called open cell urethane foam is that there are no membrane-like windows connecting the strands, and which would offer increased resistance to air flow, and would prevent desired change of direction of air ow.
- This invention also reduces the costs of such rotors for single-inlet fans by greatly reducing their axial lengths, and by using spikes formed on the rotors, embedded in the inner end portions of fibrous rings for holding the rings on the rotors.
- This invention also reduces the costs of such rotors for double-inlet fans by supporting annular rings of fibrous material on the centerplates only of the rotors.
- An object of this invention is to improve capillary fans.
- Another object of this invention is to reduce the costs of capillary fans.
- Another object of this invention is to use sponge-like foamed plastic formed in annular rings as the air moving elements of centrifugal fans.
- Another object of this invention is to use annular rings of polyurethane foam as the air moving elements of centrifugal fans.
- FIG. 1 is a side view, in section, of a rotor of a singleinlet centrifugal fan embodying this invention
- FIG. 2 is an end view looking at the air inlet end of FIG. l;
- FIG. 3 is a side View, in section, of another rotor of a single-inlet centrifugal fan embodying this invention
- FIG. 4 is an end view looking at the air inlet end of FIG. 3;
- FIG. 5 is a side view, in section, of a rotor of a doubleinlet centrifugal fan embodying this invention.
- FIG. 6 is a greatly enlarged view showing the three dimensional network of skeletal strands integrally joined together, and the voids therebetween, of polyurethane foam which preferably is used on the rotors of FIGS. 1-5.
- a backplate 10 of cast plastic has a hub 11, and an outer ice cylindrical ring portion 12 around and concentric with the hub.
- the inner surface of the ring portion 12 has formed thereon radially extending spikes 13 which extend into the inner portion of an annular ring 14 of polyurethane foam.
- the length of the ring 14 in the direction of the axis of the rotor is many times that of the ring portion 12, since the stiffness of the ring 14 is sufficient to prevent its requiring support along its entire length as in the case of prior rotors which support annular rings of librous material.
- the supporting structure for the annular ring is simplier and less expensive than prior basket-like structures which extend the full lengths of their associated annular rings, and the annular rings are easier to remove and replace than in prior constructions.
- the rotor of FIGS. 3 and 4 is similar to that of FIGS. 1 and 2 except that its backplate 10A has spikes 13A which have axes parallel to the axis of the rotor extending into the inner portion of ring 14A of polyurethane foam, the rotor having a ring portion 12A at its rim similar to the ring portion 12 of FIGS. 1 and 2 except lthat it is free of spikes, and having a hub 11A.
- the rotor of FIGS. 3 and'4 has the same advantages as that of FIGS. l and 2.
- the rotor of FIG. 5 is for a double-inlet fan, and has a centerplate 2l) with an enlarged rim 21 having a central inwardly curved outer edge 22, and has a hub 23.
- the snap-ring 25 and the annular ring 24 are easily removable and replacable.
- FIGS. 1-5 While it is preferred that the rotors of FIGS. 1-5 use annular rings of polyurethane, they could support annular rings of other fibrous materials.
- FIG. 6 shows the skeletal structure of the polyurethane rings which preferably are used on the rotors of FIGS. 1 5. It has strands 30 which extend in three dimensions, which are integrally joined at their ends with other strands 30, and which form therebetween voids 31 which occupy the larger portion of the air volume of the foam.
- the strands 30 of the annular rings of polyurethane foam on the rotors change the direction of the air they impact in the direction of rotation of the rotors, and cause air flow in the usual centrifugal action.
- the centerplate of a double-inlet rotor is, of course, the backplate of each rotor section.
- a rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of sponge-like foamed plastic having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced from said rim portion a distance large than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said backplate into said end portion of said ring.
- a rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of polyurethane foam having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced from said rim portion a distance larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said backplate into said end portion of said ring.
- a rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of sponge-like foamed plastic having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said rim portion into said end portion.
- a rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of polyurethane foam having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said rim portion into said end portion.
- a rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of fibrous material having one end in Contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said baekplate, and a plurality of spikes extending from said backplate into said end portion.
- a rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of fibrous material having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in conact With the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said rim portion into said end portion.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
April 14, 1964 J, E MCDONALD CAPILLARY FANS Filed Aug. 16, 1962 4 United States Patent 3,128,940 CAPILLARY FANS John E. McDonald, Newton, Mass., assigner to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Filed Aug. 16, 1962, Ser. No. 217,341 6 Claims. (Cl. 230-134) This invention relates to capillary fans in which the movement of air is produced by rotating rings of fibrous material.
In air conditioning and other air handling units using centrifugal fans for moving air, and in which quietness of operation is more important than eiciency, it has been proposed to use rings of fibrous material such as socalled glass wool of fibre glass on the rotors of centrifugal fans instead of the usual fan blades, and to support such rings along their entire axial lengths.
This invention uses as the air moving element of a centrifugal fan, an annular ring of sponge-like foamed plastic. By sponge-like is meant a three dimensional network of skeletal strands integrally joined together and forming therebetween voids which occupy the major portion of the volume air space of the foamed plastic. A preferred material is polyurethane foam, the advantages of which are its low cost, its being easily removable from a fan rotor when it has become clogged with dirt, its being easily cleaned and replaced on the rotor, its lack of break-up during handling and use, and its having sufficient stiffness, while it is resilient, to be largely self supporting. An advantage over well known, so-called open cell urethane foam is that there are no membrane-like windows connecting the strands, and which would offer increased resistance to air flow, and would prevent desired change of direction of air ow.
This invention also reduces the costs of such rotors for single-inlet fans by greatly reducing their axial lengths, and by using spikes formed on the rotors, embedded in the inner end portions of fibrous rings for holding the rings on the rotors.
This invention also reduces the costs of such rotors for double-inlet fans by supporting annular rings of fibrous material on the centerplates only of the rotors.
An object of this invention is to improve capillary fans.
Another object of this invention is to reduce the costs of capillary fans.
Another object of this invention is to use sponge-like foamed plastic formed in annular rings as the air moving elements of centrifugal fans.
Another object of this invention is to use annular rings of polyurethane foam as the air moving elements of centrifugal fans.
This invention will now be described with reference to the annexed drawings, of which:
FIG. 1 is a side view, in section, of a rotor of a singleinlet centrifugal fan embodying this invention;
FIG. 2 is an end view looking at the air inlet end of FIG. l;
FIG. 3 is a side View, in section, of another rotor of a single-inlet centrifugal fan embodying this invention;
FIG. 4 is an end view looking at the air inlet end of FIG. 3;
FIG. 5 is a side view, in section, of a rotor of a doubleinlet centrifugal fan embodying this invention, and
FIG. 6 is a greatly enlarged view showing the three dimensional network of skeletal strands integrally joined together, and the voids therebetween, of polyurethane foam which preferably is used on the rotors of FIGS. 1-5.
Referring rst to FIGS. l and 2 of the drawings, a backplate 10 of cast plastic has a hub 11, and an outer ice cylindrical ring portion 12 around and concentric with the hub. The inner surface of the ring portion 12 has formed thereon radially extending spikes 13 which extend into the inner portion of an annular ring 14 of polyurethane foam. The length of the ring 14 in the direction of the axis of the rotor is many times that of the ring portion 12, since the stiffness of the ring 14 is sufficient to prevent its requiring support along its entire length as in the case of prior rotors which support annular rings of librous material. Thus, the supporting structure for the annular ring is simplier and less expensive than prior basket-like structures which extend the full lengths of their associated annular rings, and the annular rings are easier to remove and replace than in prior constructions.
The rotor of FIGS. 3 and 4 is similar to that of FIGS. 1 and 2 except that its backplate 10A has spikes 13A which have axes parallel to the axis of the rotor extending into the inner portion of ring 14A of polyurethane foam, the rotor having a ring portion 12A at its rim similar to the ring portion 12 of FIGS. 1 and 2 except lthat it is free of spikes, and having a hub 11A. The rotor of FIGS. 3 and'4 has the same advantages as that of FIGS. l and 2.
The rotor of FIG. 5 is for a double-inlet fan, and has a centerplate 2l) with an enlarged rim 21 having a central inwardly curved outer edge 22, and has a hub 23. An annular ring 24 of polyurethane foam having an inner diameter smaller than the distance between diametrally opposite portions of the edge 22, is placed at its longitudinal center on the edge 22, and a plastic snap-ring 25, circular in section, is placed around the longitudinal center of the ring 24, deforming the latter so that its inner surface at the edge 22 is forced against the latter, and forming the sole means for supporting the ring 24 from the centerplate 20. The snap-ring 25 and the annular ring 24 are easily removable and replacable.
While it is preferred that the rotors of FIGS. 1-5 use annular rings of polyurethane, they could support annular rings of other fibrous materials.
FIG. 6 shows the skeletal structure of the polyurethane rings which preferably are used on the rotors of FIGS. 1 5. It has strands 30 which extend in three dimensions, which are integrally joined at their ends with other strands 30, and which form therebetween voids 31 which occupy the larger portion of the air volume of the foam.
The strands 30 of the annular rings of polyurethane foam on the rotors change the direction of the air they impact in the direction of rotation of the rotors, and cause air flow in the usual centrifugal action.
The centerplate of a double-inlet rotor is, of course, the backplate of each rotor section.
What is claimed is:
l. A rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of sponge-like foamed plastic having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced from said rim portion a distance large than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said backplate into said end portion of said ring.
2. A rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of polyurethane foam having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced from said rim portion a distance larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said backplate into said end portion of said ring.
3. A rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of sponge-like foamed plastic having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said rim portion into said end portion.
4. A rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of polyurethane foam having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said rim portion into said end portion.
5. A rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of fibrous material having one end in Contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in contact with the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said baekplate, and a plurality of spikes extending from said backplate into said end portion.
6. A rotor for a centrifugal fan comprising a circular backplate having a hub around its axis, an annular ring of fibrous material having one end in contact with said backplate, said ring being concentric with said backplate, said backplate having an annular rim portion extending around the end portion of said ring at said end and having its inner surface in conact With the outer surface of said end portion, the other end of said ring being spaced a distance from said rim portion larger than the distance said rim portion extends from said backplate, and a plurality of spikes extending from said rim portion into said end portion.
References Cited in the tile of this patent UNITED STATES PATENTS 584,046 Moore June 8, 1897 630,365 Laplace Aug. 8, 1899 926,596 Patterson June 29, 1909 2,272,746 Hansen Feb. 10, 1942 2,966,960 Rochlin Ian. 3, 1961 2,991,84-3 Bell July 11, 1961 3,018,896 Gewiss Jan. 30, 1962 FOREIGN PATENTS 532,467 Great Britain Ian. 24, 1941 720,956 Great Britain Dec. 29, 1954 124,155 Australia May 15, 1947
Claims (1)
1. A ROTOR FOR A CENTRIFUGAL FAN COMPRISING A CIRCULAR BACKPLATE HAVING A HUB AROUND ITS AXIS, AN ANNULAR RING OF SPONGE-LIKE FOAMED PLASTIC HAVING ONE END IN CONTACT WITH SAID BACKPLATE, SAID RING BEING CONCENTRIC WITH SAID BACKPLATE, SAID BACKPLATE HAVING AN ANNULAR RIM PORTION EXTENDING AROUND THE END PORTION OF SAID RING AT SAID END AND HAVING ITS INNER SURFACE IN CONTACT WITH THE OUTER SUR-
Publications (1)
Publication Number | Publication Date |
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US3128940A true US3128940A (en) | 1964-04-14 |
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Family Applications (1)
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US3128940D Expired - Lifetime US3128940A (en) | Capillary fans |
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US (1) | US3128940A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3765155A (en) * | 1969-04-04 | 1973-10-16 | Charbonnages | Apparatus for the suction and purification of polluted air |
US3804548A (en) * | 1970-10-14 | 1974-04-16 | Buderus Eisenwerk | Blower construction |
US4019815A (en) * | 1973-06-28 | 1977-04-26 | Polaroid Corporation | Film handling apparatus blower system |
US4292055A (en) * | 1975-11-25 | 1981-09-29 | Castella Pierre M T De | Purifier for gaseous fluids |
US4669951A (en) * | 1983-07-28 | 1987-06-02 | Stern Leif E | Air operated motor |
US4795319A (en) * | 1986-11-17 | 1989-01-03 | Popovich John M | Quiet hair dryer |
US5265348A (en) * | 1992-08-12 | 1993-11-30 | Fleishman Roc V | Porous rotor |
WO1994004823A1 (en) * | 1992-08-12 | 1994-03-03 | Fleishman Roc V | Porous rotor |
US5649813A (en) * | 1995-04-20 | 1997-07-22 | Ingersoll-Rand Company | Chamber insulation for prevention of icing in air motors |
US5681364A (en) * | 1995-08-03 | 1997-10-28 | Fortune; William S. | Rotating element fume collection apparatus |
US20170089360A1 (en) * | 2014-06-18 | 2017-03-30 | Hewlett- Packard Development Company, L.P. | Fan Including an Acoustic Absorption Member in Contact and Movable with Vanes |
CN110195719A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
CN110195720A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
CN110195711A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
CN110195718A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
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US584046A (en) * | 1897-06-08 | Centrifugal machine | ||
US630365A (en) * | 1899-01-05 | 1899-08-08 | Ulysse Laplace | Filter attachment for centrifugal machines. |
US926596A (en) * | 1907-02-01 | 1909-06-29 | Oil And Waste Saving Machine Company | Centrifugal separator. |
GB532467A (en) * | 1939-07-28 | 1941-01-24 | John Ambrose Sadd Major | Improvements in apparatus for filtering and/or purifying air or other gas |
US2272746A (en) * | 1940-10-02 | 1942-02-10 | Gen Electric | Air purifying unit |
GB720956A (en) * | 1952-06-21 | 1954-12-29 | Westinghouse Electric Int Co | Improvements in or relating to centrifugal fan wheels |
US2966960A (en) * | 1958-12-01 | 1961-01-03 | Foamade Ind | Air filter |
US2991843A (en) * | 1958-12-30 | 1961-07-11 | Safeguard Corp | Ventilator construction |
US3018896A (en) * | 1958-03-12 | 1962-01-30 | Gewiss Lucien Victor | Fluid propelling and filtering apparatus |
-
0
- US US3128940D patent/US3128940A/en not_active Expired - Lifetime
Patent Citations (9)
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---|---|---|---|---|
US584046A (en) * | 1897-06-08 | Centrifugal machine | ||
US630365A (en) * | 1899-01-05 | 1899-08-08 | Ulysse Laplace | Filter attachment for centrifugal machines. |
US926596A (en) * | 1907-02-01 | 1909-06-29 | Oil And Waste Saving Machine Company | Centrifugal separator. |
GB532467A (en) * | 1939-07-28 | 1941-01-24 | John Ambrose Sadd Major | Improvements in apparatus for filtering and/or purifying air or other gas |
US2272746A (en) * | 1940-10-02 | 1942-02-10 | Gen Electric | Air purifying unit |
GB720956A (en) * | 1952-06-21 | 1954-12-29 | Westinghouse Electric Int Co | Improvements in or relating to centrifugal fan wheels |
US3018896A (en) * | 1958-03-12 | 1962-01-30 | Gewiss Lucien Victor | Fluid propelling and filtering apparatus |
US2966960A (en) * | 1958-12-01 | 1961-01-03 | Foamade Ind | Air filter |
US2991843A (en) * | 1958-12-30 | 1961-07-11 | Safeguard Corp | Ventilator construction |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3765155A (en) * | 1969-04-04 | 1973-10-16 | Charbonnages | Apparatus for the suction and purification of polluted air |
US3804548A (en) * | 1970-10-14 | 1974-04-16 | Buderus Eisenwerk | Blower construction |
US4019815A (en) * | 1973-06-28 | 1977-04-26 | Polaroid Corporation | Film handling apparatus blower system |
US4292055A (en) * | 1975-11-25 | 1981-09-29 | Castella Pierre M T De | Purifier for gaseous fluids |
US4669951A (en) * | 1983-07-28 | 1987-06-02 | Stern Leif E | Air operated motor |
US4795319A (en) * | 1986-11-17 | 1989-01-03 | Popovich John M | Quiet hair dryer |
US5265348A (en) * | 1992-08-12 | 1993-11-30 | Fleishman Roc V | Porous rotor |
WO1994004823A1 (en) * | 1992-08-12 | 1994-03-03 | Fleishman Roc V | Porous rotor |
US5297942A (en) * | 1992-08-12 | 1994-03-29 | Fleishman Roc V | Porous rotor |
US5649813A (en) * | 1995-04-20 | 1997-07-22 | Ingersoll-Rand Company | Chamber insulation for prevention of icing in air motors |
US5681364A (en) * | 1995-08-03 | 1997-10-28 | Fortune; William S. | Rotating element fume collection apparatus |
US20170089360A1 (en) * | 2014-06-18 | 2017-03-30 | Hewlett- Packard Development Company, L.P. | Fan Including an Acoustic Absorption Member in Contact and Movable with Vanes |
CN110195719A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
CN110195720A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
CN110195711A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
CN110195718A (en) * | 2018-02-26 | 2019-09-03 | 日本电产株式会社 | Centrifugal fan |
JP2019148178A (en) * | 2018-02-26 | 2019-09-05 | 日本電産株式会社 | Centrifugal fan |
JP2019148177A (en) * | 2018-02-26 | 2019-09-05 | 日本電産株式会社 | Centrifugal fan |
JP2019148180A (en) * | 2018-02-26 | 2019-09-05 | 日本電産株式会社 | Centrifugal fan |
US10962017B2 (en) * | 2018-02-26 | 2021-03-30 | Nidec Corporation | Centrifugal fan |
CN110195711B (en) * | 2018-02-26 | 2022-11-29 | 日本电产株式会社 | Centrifugal fan |
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