Fan shroud with flow directing deflectors
AssigneeUnada Co. Ltd.
InventorsEduardo Strle, Vinícius Burigo Neto
Life of this patent
Estimating the term…
Abstract
A shroud for an axial fan includes a plurality of air-deflector vanes positioned on the pressure side of the fan impeller. Each vane has a surface oriented at an angle to the axial direction that is between 0 and 90 degrees. Preferably, the angle is between 40 and 60 degrees. Each vane has a longitudinal axis and the vanes are oriented so that these axes are approximately but not necessarily exactly parallel to each other and are approximately but not necessarily exactly perpendicular to the axial direction. Preferably, the axes are oriented within 5 degrees of each other and within 5 degrees of perpendicular to the axial direction.
Claims16
A fan shroud for an axial fan impeller having an axis of rotation and an axial direction of air flow, the shroud comprising:
- (a) a roughly cylindrical body comprising:
- (i) a periphery defining a cavity configured to receive the axial fan impeller,
- (ii) a longitudinal axis that is configured to be coaxial with the impeller's axis of rotation when the impeller is placed in the cavity,
- (iii) an x axis extending radially from the longitudinal axis, and
- (iv) a y axis extending radially from the longitudinal axis and perpendicular to the x axis,
- (b) a plurality of air-deflector vanes connected to the body, each vane having a length spanning points on the periphery, a width, and a flow-facing surface;
- (c) wherein each air-deflector vane is disposed at a longitudinal-axial position apart from the cavity in the direction of the air flow;
- (d) wherein each air-deflector vane's flow-facing surface has a facing angle relative to the longitudinal axis such that the flow-facing surface is neither parallel nor perpendicular to the longitudinal axis;
- and
- (e) wherein each air-deflector vane's flow-facing surface has a tilt angle relative to the x axis.
A cooling fan comprising:
- (a) a fan shroud comprising a body with a periphery defining a cavity;
- (b) an axial impeller disposed within the cavity and having an axis of rotation and an axial direction of air flow;
- (c) a first air-deflector vane having a first length, a first width, a first longitudinal axis, and a first flow-facing surface, the first air-deflector vane connected to the body with the first length spanning points on the periphery;
- and
- (d) a second air-deflector vane having a second length, a second width, a second longitudinal axis, and a second flow-facing surface, the second air-deflector vane connected to the body with the second length spanning points on the periphery, wherein the second length is different from the first length and the second width is different from the first width;
- (e) wherein the first air-deflector vane is positioned adjacent to the impeller and spaced apart from the impeller in the axial direction of air flow such that the first flow-facing surface forms a facing angle relative to the axial direction of air flow of between 45 and 70 degrees and the first longitudinal axis forms an angle with the axial direction of air flow between 80 and 100 degrees;
- and
- (f) wherein the second air-deflector vane is positioned adjacent to the impeller and spaced apart from the impeller in the axial direction of air flow such that the second flow-facing surface forms a facing angle relative to the axial direction of air flow of between 45 and 70 degrees and the second longitudinal axis forms an angle with the axial direction of air flow between 80 and 100 degrees.
Dependencies are inferred from the claim text.