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US 7,029,229 B2Granted
Axial flow fan
AssigneesHitachi, Ltd., Japan Servo Co., Ltd.
InventorsTaku Iwase, Kazuyuki Sugimura, Taro Tanno
Life of this patent
Estimating the term…
Abstract
An axial flow fan of high efficiency and low noise level is provided. The fan includes a motor, an impeller having a plurality of blades around a hub fitted to the motor, and a fan casing having an air inlet on one side and an air outlet on the other, wherein a radial position with a maximum setting angle in a blade section, and a radial position with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction are located between 60% and 80% of the outside diameter of the impeller.
Claims18
An axial flow fan comprising:
- a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and
- a fan casing having an air inlet on one side and an air outlet on the other;
- wherein a radial position with a maximum setting angle ξ in a blade section, and a radial position Aa with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction are located between 60% and 80% of the outside diameter of the impeller.
2 more elements
An axial flow fan comprising:
- a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and
- a fan casing having an air inlet on one side and an air outlet on the other;
- wherein a radial position with a maximum setting angle ξ in a blade section, and a radial position with a maximum chord-pitch ratio σ when the chord-pitch ratio σ is defined as σ=L/T, where L is a length of a chord line to connect a leading edge to a trailing edge of the blade, and T is a pitch of a circumferential length at the radius R divided by the blade number Z, are located between 60% and 80% of the outside diameter of the impeller.
2 more elements
An axial flow fan comprising:
- a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and
- a fan casing having an air inlet on one side and an air outlet on the other;
- wherein a radial position with a maximum setting angle ξ in a blade section, a radial position Aa with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction, and a radial position with a maximum chord-pitch ratio σ when the chord-pitch ratio σ is defined as σ=L/T, where L is a length of a chord line to connect a leading edge to a trailing edge of the blade, and T is a pitch of a circumferential length at the radius R divided by the blade number Z, are located between 60% and 80% of the outside diameter of the impeller.
2 more elements
A method for using an axial flow fan, the fan comprising a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and a fan casing having an air inlet on one side and an air outlet on the other;
- a radial position with a maximum setting angle ξ in a blade section, and a radial position Aa with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction being located between 60% and 80% of the outside diameter of the impeller;
- the method comprising arranging an object to be cooled to project at a position of the radius larger than the tip portion radius Rt on the air outlet side of the axial flow fan and operating the axial flow fan.
1 more element
A method for using an axial flow fan, the fan comprising a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and a fan casing having an air inlet on one side and an air outlet on the other;
- a radial position with a maximum setting angle ξ in a blade section, and a radial position with a maximum chord-pitch ratio σ being located between 60% and 80% of the outside diameter of the impeller, when the chord-pitch ratio σ is defined as σ=L/T, where L is a length of a chord line to connect a leading edge to a trailing edge of the blade, and T is a pitch of a circumferential length at the radius R divided by the blade number Z,
- the method comprising arranging an object to be cooled to project at a position of the radius larger than the tip portion radius Rt on the air outlet side of the axial flow fan and operating the axial flow fan.
1 more element
A method for using an axial flow fan, the fan comprising a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and a fan casing having an air inlet on one side and an air outlet on the other;
- a radial position with a maximum setting angle ξ in a blade section, a radial position Aa with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction, and a radial position with a maximum chord-pitch ratio σ being located between 60% and 80% of the outside diameter of the impeller, when the chord-pitch ratio σ is defined as σ=L/T, where L is a length of a chord line to connect a leading edge to a trailing edge of the blade, and T is a pitch of a circumferential length at the radius R divided by the blade number Z,
- the method comprising arranging an object to be cooled to project at a position of the radius larger than the tip portion radius Rt on the air outlet side of the axial flow fan and operating the axial flow fan.
1 more element
A heat sink with an axial flow fan comprising:
- an axial flow fan including a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and a fan casing having an air inlet on one side and an air outlet on the other;
- a radial position with a maximum setting angle ξ in a blade section, and a radial position Aa with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction being located between 60% and 80% of the outside diameter of the impeller;
- and
- a heat sink placed on an outlet side of the axial flow fan at the position projecting from the tip portion radius Rt.
3 more elements
A heat sink with an axial flow fan comprising:
- an axial flow fan including a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and a fan casing having an air inlet on one side and an air outlet on the other;
- a radial position with a maximum setting angle ξ in a blade section, and a radial position with a maximum chord-pitch ratio σ being located between 60% and 80% of the outside diameter of the impeller, when the chord-pitch ratio σ is defined as σ=L/T, where L is a length of a chord line to connect a leading edge to a trailing edge of the blade, and T is a pitch of a circumferential length at the radius R divided by the blade number Z;
- and
- a heat sink placed on an outlet side of the axial flow fan at the position projecting from the tip portion radius Rt.
3 more elements
A heat sink with an axial flow fan comprising:
- an axial flow fan including a motor;
- an impeller having a plurality of blades around a hub fitted to the motor;
- and a fan casing having an air inlet on one side and an air outlet on the other;
- a radial position with a maximum setting angle ξ in a blade section, a radial position Aa with a contour of a leading edge portion in a fluid flowing direction forming a projecting apex in the flowing direction, and a radial position with a maximum chord-pitch ratio σ being located between 60% and 80% of the outside diameter of the impeller, when the chord-pitch ratio σ is defined as σ=L/T, where L is a length of a chord line to connect a leading edge to a trailing edge of the blade, and T is a pitch of a circumferential length at the radius R divided by the blade number Z;
- and
- a heat sink placed on an outlet side of the axial flow fan at the position projecting from the tip portion radius Rt.
3 more elements
Dependencies are inferred from the claim text.