# US 10,309,422 B2 · Blower

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- Number: US 10,309,422 B2
- Document ID: US10309422B2
- Status: Granted
- Kind: B2
- Application number: 15/112,706
- Filed: 2015-02-20
- Published: 2016-11-24
- Granted: 2019-06-04
- Earliest claimed: 2014-02-21
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Toshikatsu Kondou; Masashi Matsukawa; Youhei Kamiya; Masaru Kamiya; Takeshi Miyamoto; Isao Kondoh; Takashi Ito; Kazuhiro Takeuchi
- Web page: https://patentgrep.com/patent/US10309422B2

## CPC

- F04D 29/667: {by influencing the flow pattern, e.g. suppression of turbulence}
- B60H 1/00464: {The ventilator being of the axial type}
- F04D 19/002: {Axial flow fans}
- F04D 25/08: the working fluid being air, e.g. for ventilation
- F04D 29/164: {of an axial flow wheel}
- F04D 29/326: {comprising a rotating shroud}
- F04D 29/526: {Details of the casing section radially opposing blade tips (ducts F04D29/545)}
- F04D 29/541: {Specially adapted for elastic fluid pumps (F04D29/56 takes precedence)}
- B60H 2001/006: {Noise reduction}
- F05B 2240/33: Shrouds which are part of or which are rotating with the rotor
- F05B 2260/96: Preventing, counteracting or reducing vibration or noise
- F05B 2280/6015: Resin
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G

## Abstract

A blower fan includes a plurality of blades radially extending from a boss provided at the rotary center and spaced apart from each other in the rotational direction, and a ring portion connecting outer peripheral ends of the blades in a ring shape. An inner peripheral wall surface of an end part on an air-flow downstream side of a cylindrical portion is disposed on the outside in a radial direction of the rotary shaft in the blower fan, with respect to an end part on the air-flow downstream side of the ring portion. The end part on the air-flow downstream side of the cylindrical portion is positioned outward in the radial direction of the rotary shaft, as toward the air-flow downstream side. Thus, the blower can prevent the backflow air from being swirled, thereby reducing noise.

## Claims

### Claim 1

A blower comprising:
an axial flow blower fan that is rotatably driven to generate an airflow; and
a shroud provided with a suction port through which air is drawn into the blower fan, and an air outlet through which air is blown out of the blower fan,
the blower fan including:
a plurality of blades radially extending from a boss provided at a rotation center and spaced apart from each other in a rotational direction; and
a ring portion connecting outer peripheral ends of the blades in a circumferential direction, wherein
an inner peripheral wall surface of an end part on an air-flow downstream side of the air outlet is disposed on an outer side in a radial direction of the ring portion in the blower fan, with respect to an end part on the air-flow downstream side of the ring portion,
the end part on the air-flow downstream side of the air outlet is positioned outward in the radial direction of the ring portion, as toward the air-flow downstream side, and
the end part on the air-flow downstream side of the air outlet is curved and smoothly protruded toward an inner side in the radial direction of the ring portion.

### Claim 2 (depends on 1)

The blower according to claim 1, wherein
an inner peripheral wall surface of the end part on the air-flow downstream side of the air outlet is overlap with the end part on the air-flow downstream side of the ring portion in an air flow direction.

### Claim 3 (depends on 1)

The blower according to claim 1, wherein
the blower fan is disposed to form a clearance between the air outlet of the shroud and the ring portion of the blower fan, and
the ring portion is provided substantially in parallel to the air outlet.