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Variable Enclosure Inlet Vanes to Air-Movers for Enhanced Cooling When Fans Fail

IP.com Disclosure Number: IPCOM000240753D
Publication Date: 2015-Feb-25
Document File: 4 page(s) / 66K

Publishing Venue

The IP.com Prior Art Database

Abstract

Described are actions which can aid in mitigating the loss of cooling when using counter-rotating fans or any stacked fan arrangement but is not applicable to system designs utilizing single rows of single rotor axial fans.

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This is the abbreviated version, containing approximately 38% of the total text.

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Variable Enclosure Inlet Vanes to Air -

-Movers for Enhanced Cooling When Fans Fail

Movers for Enhanced Cooling When Fans Fail

Cooling fans can fail in various ways such as when a foreign object entering the fan system causing stoppage or damage to one or more of the impellers or impeller blades, or a motor failure causing the fan to no longer rotate, or causing the fan to rotate freely but not increasing the airflow. Each of these representative failures can cause the fan chassis containing one or more failed impellers to produce a lesser airflow compared to fully-functioning fan chassis without a failed impeller. The airflow differential can cause uneven airflow distribution leading to heat build-up within the system. This article describes actions which can aid in mitigating the loss of cooling when using counter rotating fans or any stacked fan arrangement but is not applicable to system designs utilizing single rows of single rotor axial fans.

    Counter-rotating fans are used to cool computational electronic components, which can include singular fan housings with multiple fan blades attached to multiple motors, configured such that placing two singular fans in line with each other such that the airflow exhaust becomes the intake of the next fan rotating opposite of the first fan, increasing the exhaust of the fan system. When fans in a computer system fail, the airflow within the system can be affected, leading to heat build-up, which can damage the computer system. Counter-rotating multiple impeller fans contain two or more impellers aligned in series, wherein an exhaust of the first impeller increases speed at which a second impeller will rotate by feeding the exhaust of the first impeller into the intake of the second impeller, in turn, increasing the speed at which the airflow exhausts the second impeller.

    When an impeller of counter-rotating fans of a multiple impeller fan fails, the surrounding sets of non-failed fans can exhaust two to three times more airflow, compared to the fan with the failed impeller(s). When the airflow is pulled away from the entrance of the failed fan into the non-failed fans, a negative pressure can result within the computer system, causing the cool air to be distributed unevenly. Uneven airflow distribution among the exhaust fans of a cooling system can lead to reduced cooling capacity of the system by the fans. The reduced cooling capacity of the system can lead to the heat build-up and component failure. This article discloses another method of cooling electrical components by directing airflow and reducing airflow and pressure differentials after a fan failure or malfunction instead of creating a static path, or duct, for air to travel down before reaching the fans. These methods do not increase the impedance to the non-failed fans to help the "failed" fan produce higher airflow rates.

    To combat the challenges of airflow distribution during a rotor failure within a counter-rotational fan,...