US3947148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan assemblies
Assignee: Peugeot Motor Co PLC
•
Filing: 1974-11-26
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Granted: 1976-03-30
•
Expires: 1994-11-26
Abstract
Abstract The disclosure relates to a fan assembly including a duct in which an axial flow fan is mounted, there being a plurality of apertures formed in the duct wall around the fan and a layer of acoustic absorption material encircles the duct and projects through the apertures into the duct to have a minimum running clearance from the periphery of the fan.
Inventors
- 👤 Paul Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:55
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/661; F04D29/663; F04D29/664; F04D29/40; F04D29/52; F04D29/522; F04D29/526
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A fan assembly comprising a duct, an axial flow fan located within the duct and including rotor blades having outer tips, the wall of the duct having a plurality of radial apertures circumferentially spaced around at least the part of the duct encircling the fan, an acoustic absorption material encircling said part of the duct and having projecting portions extending radially inwardly through the apertures into the duct towards the fan axis, the projections terminating in radially inwardly directed end faces which lie in the path of rotation of the periphery of the fan in a manner to provide a minimum clearance between the projections and the tips of the rotor blades of the fan.
Claim 2
Dependent Claim
115 words
A fan assembly comprising a duct, an axial flow fan located within the duct and including rotor blades having outer tips, the wall of the duct having a plurality of radial apertures circumferentially spaced around at least the part of the duct encircling the fan, an acoustic absorption material encircling said part of the duct and having projecting portions extending radially inwardly through the apertures into the duct towards the fan axis, the projections terminating in radially inwardly directed end faces which lie in the path of rotation of the periphery of the fan in a manner to provide a minimum clearance between the projections and the tips of the rotor blades of the fan.
Claim 3
Dependent Claim
24 words
A fan assembly as claimed in claim 1 wherein the layer of acoustic absorption material is encircled by a layer of acoustic barrier material.
Claim 4
Dependent Claim
19 words
A fan assembly as claimed in claim 1 wherein the acoustic absorption material is an open cell polyurethane foam.
Claim 5
Dependent Claim
16 words
A fan assembly as claimed in claim 2 wherein the acoustic barrier material is a plastics.
Claim 6
Dependent Claim
25 words
A fan assembly as claimed in claim 1 wherein the apertures are elongate and extend along the duct both upstream and downstream of the fan.
Claim 7
Dependent Claim
21 words
A fan assembly as claimed in claim 5 wherein said apertures extend at an angle to the axis of the duct.
Claim 8
Dependent Claim
34 words
A fan assembly as claimed in claim 1 wherein the duct contains stator blades spaced around the inner periphery of the duct upstream of said fan and said apertures project between the stator blades.
Claim 9
Dependent Claim
17 words
A fan assembly as claimed in claim 2 wherein the acoustic barrier material is a synthetic rubber.
Claim 10
Dependent Claim
17 words
A fan assembly as claimed in claim 2 wherein the acoustic barrier material is a natural rubber.
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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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |