US4859140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal fan
Assignee: Sinko Industries Ltd
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Filing: 1986-06-13
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Granted: 1989-08-22
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Expires: 2006-06-13
Abstract
Abstract A centrifugal fan in which the cone and wheel have a telescoping relationship to vary the rated capacity of the fan. The mechanism effects the relative movement manually, or by a servo arrangement responsive to system pressure. The telescoping relationship includes an anti-recirculation sleeve on the cone. The wheel and cone can be moved to effect engagement of the cone and the wheel back plate to cut off the fan, when in a parallel arrangement, and to arrest wheel movement, after the drive to the wheel has been stopped. In another aspect, the cone and wheel are bodily stationary and a separate movable flow control sleeve is positioned to control flow.
Inventors
- 👤 Albert M. Passadore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:35
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/46; F04D29/462; F04D29/464; F04D27/00; F04D27/002
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
An air system comprising: an air conducting ductwork having plural outlets; an area controller for each of at least some of the outlets; a centrifugal fan connected to said ductwork; said fan having a cone and a wheel in telescopic relationship of the cone within the wheel; at least one air pressure sensor connected to said ductwork; and a servo position controller interconnecting said sensor to at least one of said cone and wheel for effecting relative positional control over the telescopic relationship of the same in accordance with the variations of air pressure at said sensor.
Claim 2
Dependent Claim
97 words
An air system comprising: an air conducting ductwork having plural outlets; an area controller for each of at least some of the outlets; a centrifugal fan connected to said ductwork; said fan having a cone and a wheel in telescopic relationship of the cone within the wheel; at least one air pressure sensor connected to said ductwork; and a servo position controller interconnecting said sensor to at least one of said cone and wheel for effecting relative positional control over the telescopic relationship of the same in accordance with the variations of air pressure at said sensor.
Claim 3
Dependent Claim
134 words
A centrifugal fan comprising: a rotary bladed wheel having a central opening with an entry mouth of circular form; an inlet cone for directing air into said wheel having an inlet and an outlet end, said inlet cone having a non-cylindrical interior surface for air flow management; means mounting said wheel and cone for relative telescopic movement of the outlet end of said cone into said wheel at said mouth, to vary the volume of air moved by said fan; said cone having an anti-recirculating sleeve of cylindrical shape telescopically received by said circular mouth; a housing enclosing said wheel and said cone; means within said housing spring-supporting said wheel and cone; said housing having an inlet opening; and a bellows connecting the inlet of said cone to said housing at said inlet opening.
Claim 4
Dependent Claim
134 words
A centrifugal fan comprising: a rotary bladed wheel having a central opening with an entry mouth of circular form; an inlet cone for directing air into said wheel having an inlet and an outlet end, said inlet cone having a non-cylindrical interior surface for air flow management; means mounting said wheel and cone for relative telescopic movement of the outlet end of said cone into said wheel at said mouth, to vary the volume of air moved by said fan; said cone having an anti-recirculating sleeve of cylindrical shape telescopically received by said circular mouth; a housing enclosing said wheel and said cone; means within said housing spring-supporting said wheel and cone; said housing having an inlet opening; and a bellows connecting the inlet of said cone to said housing at said inlet opening.
Claim 5
Dependent Claim
98 words
A centrifugal fan comprising: a rotary bladed wheel, disposed in a bodily stationary position; inlet cone means for directing air into said wheel, said cone means having an inlet and outlet end, said inlet cone means being bodily stationary; sleeve means slidably interposed between the outlet end of said inlet cone and interior of said wheel for reducing the effective area of the interior of said wheel; and means for moving the sleeve means axially to disposed it in a desired masking position at the interior of the wheel so as to controllably starve the wheel for air.
Claim 6
Dependent Claim
98 words
A centrifugal fan comprising: a rotary bladed wheel, disposed in a bodily stationary position; inlet cone means for directing air into said wheel, said cone means having an inlet and outlet end, said inlet cone means being bodily stationary; sleeve means slidably interposed between the outlet end of said inlet cone and interior of said wheel for reducing the effective area of the interior of said wheel; and means for moving the sleeve means axially to disposed it in a desired masking position at the interior of the wheel so as to controllably starve the wheel for air.
Claim 7
Dependent Claim
16 words
The centrifugal fan of claim 3 wherein said sleeve surrounds the exterior of said inlet cone.
Claim 8
Dependent Claim
29 words
The centrifugal fan of claim 3 wherein the means for moving the sleeve axially comprises a jackshaft operatively interconnected with the sleeve for effecting axial movement of the same.
Claim 9
Dependent Claim
106 words
The centrifugal fan of claim 5 including: a first crank arm secured to the jackshaft; a drive shaft; a second crank arm secured to the drive shaft; a push rod extending between the first and second crank arms, the push rod being pivotally connected to the first and second crank arms; a third crank arm secured to the drive shaft; a roller track secured to the sleeve, the third crank arm being rollably connected to the roller track whereby said first, second, and third crank arms, push rod, drive shaft and roller track cooperate for providing axial movement of said sleeve upon turning of said jackshaft.
Claim 10
Dependent Claim
54 words
The centrifugal fan of claim 3 in which the last named means moves the sleeve from a retracted position in which it does not hinder the supply of sair to the interior of the wheel to an extended position in which it entirely blocks the supply of air to the interior of the wheel.
Claim 11
Dependent Claim
33 words
The centrifugal fan of claim 7 in which the fan further includes anti-recirculation means for preventing air that has not first passed through the inlet cone from entering the interior of the wheel.
Claim 12
Dependent Claim
56 words
The centrifugal fan of claim 3 in which a portion of the sleeve means that is movable into the interior of the wheel has tubular outer surface for positioning adjacent the inner edges of blades attached about the periphery of the wheel, to thereby more effectively reduce the effective area of the interior of the wheel.
Claim 13
Dependent Claim
22 words
The centrifugal fan of claim 3 in which the outlet end of the cone means extends into the inside of the wheel.
Claim 14
Dependent Claim
139 words
A centrifugal fan comprising: a rotary bladed wheel having a central opening with an entry mouth of circular form; an intake cone for directing air into said wheel, said intake cone having an inlet and an outlet, said intake cone further having a non-cylindrical interior surface for air flow management and having a cylindrical outer surface for preventing recirculation; a housing including a pressurized chamber into which air is urged by the rotary bladed wheel, one of the boundaries of said pressurized chamber being the cylindrical outer surface of the intake cone; bearing means mounted to said wheel and intake cone permitting relative telescopic movement of the outlet of said cone into the entry mouth of said wheel; and motive means for moving the intake cone relative to the wheel so as to controllably starve the wheel for air.
Claim 15
Dependent Claim
139 words
A centrifugal fan comprising: a rotary bladed wheel having a central opening with an entry mouth of circular form; an intake cone for directing air into said wheel, said intake cone having an inlet and an outlet, said intake cone further having a non-cylindrical interior surface for air flow management and having a cylindrical outer surface for preventing recirculation; a housing including a pressurized chamber into which air is urged by the rotary bladed wheel, one of the boundaries of said pressurized chamber being the cylindrical outer surface of the intake cone; bearing means mounted to said wheel and intake cone permitting relative telescopic movement of the outlet of said cone into the entry mouth of said wheel; and motive means for moving the intake cone relative to the wheel so as to controllably starve the wheel for air.
Claim 16
Dependent Claim
81 words
The fan of claim 11 in which the motive means includes a first member attached to the housing, a second member attached to the intake cone and means coupled to said members for effecting relative movement therebetween, said motive means being positioned externally of an imaginary cylinder defined by the circular entry mouth of the rotary bladed wheel and extending axially therefrom, whereby the motive means does not interfere with the flow of air into the inlet of the intake cone.
Claim 17
Dependent Claim
47 words
The fan of claim 12 in which one of the boundaries of said pressurized chamber is a flexible sealing member coupled between the housing and the inlet of the intake cone to seal any air gap therebetween regardless of the intake cone's position relative to the housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |