US 8,262,444 B2Granted

Electronic device with airflow reversal prevention assembly

AssigneeHon Hai Precision Industry Co., Ltd.

InventorMing-Der Chou

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Abstract

An electronic device includes a housing, and an active fan and an airflow reversal prevention assembly installed in the housing. The assembly includes a first grid plate defining a plurality of vents, a second grid plate abutting against the first grid plate, a passive fan, and an elastic member. The second grid plate defines a plurality of vents being selectively aligned with the vents of the first grid plate. The passive fan is driven by air from the active fan to rotate, thereby driving the second grid plate to slide relative to the first grid plate. Thus the vents of the second grid plate are aligned with the corresponding vents of the first grid plate. The elastic member is capable of urging the second grid plate to slide to return, whereby the vents of the second grid plate are out of alignment with the vents of the first grid plate.

Claims10

Dependent claims

An electronic device comprising:

a housing defining an outlet;
an active fan installed in the housing;
and
an airflow reversal prevention assembly fixed in the housing, comprising:
a first grid plate defining a plurality of vents;
a second grid plate clinging to the first grid plate in parallel, the second grid plate defining a plurality of vents being selectively aligned with the vents of the first grid plate;
a passive fan comprising a stator shaft unmovable relative to the first grid plate, and a plurality of vanes rotatably mounted to the stator shaft to be driven to rotate about the stator shaft by air from the active fan;
at least one drive member connected between the second grid plate and the vanes of the passive fan, such that the second grid plate is moved with the rotation of the vanes of the passive fan to align the vents of the second grid plate with the vents of the first grid plate;
and
at least one elastic member to bias the second grid plate to move back to make the vents of the second grid plate being out of alignment with the vents of the first grid plate.

7 more elements

An electronic device comprising:

a housing;
an electric fan installed in the housing;
a first grid plate attached in the housing and spaced from the electric fan, the first grid plate defining a plurality of vents;
a second grid plate abutting against the first grid plate in parallel, the second grid plate defining a plurality of vents capable of being aligned with the vents of the first grid plate;
a passive fan located between the electric fan and the second grid plate, and comprising a stator shaft fixed to the first grid plate, and a plurality of vanes rotatably mounted to the stator shaft and connected to the second grid plate to drive the second grid plate to slide relative to the first grid plate to a first position, where the vents of the second grid plate are aligned with the vents of the first grid plate, in response to the vanes of the passive fan being driven to rotate about the stator shaft by air from the electric fan;
and
elastic means for biasing the second grid plate to slide relative to the first grid plate to a second position, where the vents of the second grid plate is out of alignment with the vents of the first grid plate.

4 more elements

Dependencies are inferred from the claim text.