Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing with axial flow runner
Reexamination Certificate
1999-12-06
2001-07-03
Ryznic, John E. (Department: 3745)
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing with axial flow runner
Reexamination Certificate
active
06254343
ABSTRACT:
FILED OF THE INVENTION
The present invention relates generally to cooling fans for electronic components. More specifically, the present invention relates to an improved housing for such fans which lowers ambient noise levels, and further relates to a method of reducing the noise levels in existing fans.
BACKGROUND OF THE INVENTION
Power devices in electronic components produce heat, and the heat must be removed in order for the electronic component to function properly. In some cases, simple convection provides adequate cooling. However, in a wide variety of applications, simple convection may not be sufficient and thus cooling fans must be used. The cooling fans greatly improve airflow past the devices, thereby preventing overheating and premature failure. Unfortunately, the cooling fans add a significant amount of noise to the overall system. In many cases, this added noise is undesirable and/or unacceptable.
Designers of electronic components are constantly searching for ways to reduce fan noise, such as by altering a number of design parameters including the design, pitch and size of the fan blades and the clearance of the fan blade tips within the housing. Nevertheless, there is a continuing need for ever quieter cooling fans for electronic components.
REFERENCES:
patent: 3334807 (1967-08-01), McMahan
patent: 4564335 (1986-01-01), Harmsen et al.
patent: 4568243 (1986-02-01), Schubert et al.
patent: 4734015 (1988-03-01), Wrobel
patent: 4819503 (1989-04-01), Fazi, Jr. et al.
patent: 5197854 (1993-03-01), Jordan
patent: 3612249 (1987-10-01), None
Morris Garron K.
Schmidt Detlef W.
Haas Kenneth A.
Mansfield Heather L.
Motorola Inc.
Ryznic John E.
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