US5720243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for separation of dust
Assignee: Husqvarna AB
•
Filing: 1996-12-20
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Granted: 1998-02-24
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Expires: 2016-12-20
Abstract
Abstract A device for centrifugal purification of combustion air in an internal combustion engine, especially for a motor saw, wherein the engine has an air cooling system including a fan wheel (19) provided in a helical fan housing (18). The device includes an air nozzle which defines an air passage for conducting combustion air from the fan housing to the engine. The air nozzle (10) is located adjacent to the fan wheel. The nozzle has an inlet (12) including a baffle wall (14) located close to the periphery of the fan wheel and conducting air to the inlet. The baffle wall has a part-elliptical shape as seen in the direction of air flow.
Inventors
- 👤 Erik Stegemyr
- 👤 Staffan Bjorklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:56
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/12; F02; F02M; F02M35/00; F02M35/02; F02M35/022; F02M35/04; F02M35/06; Y; Y10; Y10S; Y10S55/00; Y10S55/14; Y10S55/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
103 words
A system for centrifugal purification of combustion air, said system comprising a fan wheel, a helical fan housing surrounding said fan wheel, and an air nozzle disposed within said fan housing close to said fan wheel, said air nozzle serving as a passageway for combustion air and having an inlet (12) comprising a baffle wall (14) located close to the periphery of said fan wheel and conducting air to said inlet, said baffle wall having a semi-elliptical shape as seen in a direction of air flow, said semi-elliptical shape being defined by an ellipse having an axes ratio of between 2.0:1 to 3.5:1.
Claim 2
Independent Claim
103 words
A system for centrifugal purification of combustion air, said system comprising a fan wheel, a helical fan housing surrounding said fan wheel, and an air nozzle disposed within said fan housing close to said fan wheel, said air nozzle serving as a passageway for combustion air and having an inlet (12) comprising a baffle wall (14) located close to the periphery of said fan wheel and conducting air to said inlet, said baffle wall having a semi-elliptical shape as seen in a direction of air flow, said semi-elliptical shape being defined by an ellipse having an axes ratio of between 2.0:1 to 3.5:1.
Claim 3
Dependent Claim
12 words
A system according to claim 1, wherein the axes ratio is 2.4:1.
Claim 4
Dependent Claim
70 words
A system according to claim 2, wherein the semi-elliptical baffle wall (14) is integrally connected to a straight wall portion (16) and wherein the inlet (12) has a generally rectangular cross-section, a width to height ratio of said inlet being between 3:1 to 4:1, a height of said inlet being defined by a radial distance between said straight wall portion (16) and an outer edge (17) of said air nozzle.
Claim 5
Dependent Claim
18 words
A system according to claim 3, wherein the width to height ratio of the inlet (12) is 3.5:1.
Claim 6
Dependent Claim
43 words
A system according to claim 4, wherein the straight wall portion (16) is inclined at an angle (α) of between 90° to 98° relative to a reference line between an axis of rotation of the fan wheel (19) and the outer edge (17).
Claim 7
Dependent Claim
43 words
A system according to claim 4, wherein the straight wall portion (16) is inclined at an angle (α) of between 92° to 95° relative to a reference line between an axis of rotation of the fan wheel (19) and the outer edge (17).
Claim 8
Dependent Claim
56 words
A system according to claim 6, wherein the air passage (11) of the air nozzle (10) from the inlet (12) extends generally tangentially to a periphery of the fan wheel (19) and then bends 90° such that an outlet (13) of the nozzle is directed generally parallel to the axis of rotation of the fan wheel.
Claim 9
Dependent Claim
56 words
A system according to claim 1, wherein the air passage (11) of the air nozzle (10) from the inlet (12) extends generally tangentially to a periphery of the fan wheel (19) and then bends 90° such that an outlet (13) of the nozzle is directed generally parallel to an axis of rotation of the fan wheel.
Claim 10
Dependent Claim
70 words
A system according to claim 1, wherein the semi-elliptical baffle wall (14) is integrally connected to a straight wall portion (16) and wherein the inlet (12) has a generally rectangular cross-section, a width to height ratio of said inlet being between 3:1 to 4:1, a height of said inlet being defined by a radial distance between said straight wall portion (16) and an outer edge (17) of said air nozzle.
Claim 11
Dependent Claim
18 words
A system according to claim 9, wherein the width to height ratio of the inlet (12) is 3.5:1.
Claim 12
Dependent Claim
56 words
A system according to claim 10, wherein the air passage (11) of the air nozzle (10) from the inlet (12) extends generally tangentially to a periphery of the fan wheel (19) and then bends 90° such that an outlet (13) of the nozzle is directed generally parallel to an axis of rotation of the fan wheel.
Claim 13
Dependent Claim
43 words
A system according to claim 9, wherein the straight wall portion (16) is inclined at an angle (α) of between 90° to 98° relative to a reference line between an axis of rotation of the fan wheel (19) and the outer edge (17).
Claim 14
Dependent Claim
56 words
A system according to claim 12, wherein the air passage (11) of the air nozzle (10) from the inlet (12) extends generally tangentially to a periphery of the fan wheel (19) and then bends 90° such that an outlet (13) of the nozzle is directed generally parallel to the axis of rotation of the fan wheel.
Claim 15
Dependent Claim
43 words
A system according to claim 9, wherein the straight wall portion (16) is inclined at an angle (α) of between 92° to 95° relative to a reference line between an axis of rotation of the fan wheel (19) and the outer edge (17).
Claim 16
Dependent Claim
56 words
A system according to claim 14, wherein the air passage (11) of the air nozzle (10) from the inlet (12) extends generally tangentially to a periphery of the fan wheel (19) and then bends 90° such that an outlet (13) of the nozzle is directed generally parallel to the axis of rotation of the fan wheel.
Claim 17
Dependent Claim
56 words
A system according to claim 9, wherein the air passage (11) of the air nozzle (10) from the inlet (12) extends generally tangentially to a periphery of the fan wheel (19) and then bends 90° such that an outlet (13) of the nozzle is directed generally parallel to an axis of rotation of the fan wheel.
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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) | 2001-02-23 | 2001-08-25 | 2002-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-23 | 2005-08-25 | 2006-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-23 | 2009-08-25 | 2010-02-24 | $7700.00 | Window Closed / Lapsed |