Air blowing device

Patent metadata

Field	Value
Publication number	US-9435350-B2
Application number	US-201013256527-A
Country	US
Kind code	B2
Filing date	Mar 4, 2010
Priority date	Apr 7, 2009
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

An air blowing device includes a housing with a suction port and a blow-off port, and a fan placed in the housing. The fan includes a fan case with a tongue section, an impeller, and a motor. The fan case includes an inlet and an outlet, and is shaped such that a space between the impeller and an inner wall of the fan case increases along a rotary direction of the impeller up to a cross section cut along a line between the tongue section and its opposite section. An opening area of the fan case at the tongue section is kept equal or decreases up to the outlet.

First claim

The invention claimed is:

1. An air blowing device comprising:
a housing including a suction port for sucking air in a room and a blow-off port for discharging the air outside the room;
a fan disposed in the housing; and
a connecting duct externally connecting to the blow-off port,
wherein the fan includes a fan case having a tongue section, an impeller disposed in the fan case, and a motor for driving the impeller,
the fan case includes an inlet communicating with the suction port and an outlet communicating with the blow-off port,
the fan case is shaped such that a space between the impeller and an inner face of the fan case increases along a rotary direction of the impeller up to a cross section cut along a line between the tongue section and an opposite section to the tongue section, and an opening area of the fan case is maintained equal from the tongue section through the outlet,
when viewed from a bottom face of the housing, the fan case has a linear section, the linear section being formed continuously and bending at the opposite section as a vertex,
a portion of the linear section between the outlet and the vertex is parallel to a portion of the fan case between the outlet and the tongue section, and
when the housing is connected to the connecting duct, the linear section becomes closer to a centerline of the duct as the linear section closes to the outlet of the fan case, the linear section also becomes closer to the centerline as the linear section extends farther from the outlet of the fan case, and a blow-off port side of the connecting duct has a greater opening area than an opening of the blow-off port.

2. The air blowing device of claim 1 further comprising a flange disposed to an outer periphery of the outlet, the flange extending over an outer periphery of the blow-off port at an interior side of the housing.

3. The air blowing device of claim 1 , wherein the blow-off port is connected with the connecting duct for connection to an exhaust duct for discharging the air outside the room.

4. The air blowing device of claim 3 , wherein a height of the impeller is smaller than a diameter of the connecting duct.

5. The air blowing device of claim 1 , wherein the connecting duct includes an inner duct, and an opening area of the inner duct at the blow-off port side is equal to the opening area of the blow-off port of the housing.

6. The air blowing device of claim 1 , wherein the fan case is formed unitarily, covering an area from positions between the tongue section and the opposite section thereto to the outlet including an outer periphery of the impeller.

7. The air blowing device of claim 6 , wherein the fan case covering the area from the positions between the tongue section and the opposite section thereto to the outlet is provided with a mounting section for mounting the fan case to the housing.

8. The air blowing device of claim 1 , wherein the suction port is formed in an underside of the housing, and the blow-off port is formed in a lateral face of the housing.

9. The air blowing device of claim 8 , wherein the housing has a box shape.

10. The air blowing device of claim 1 , wherein a plan area of the impeller falls within a range from not smaller than ⅛ to not greater than ⅓ of a plan area of the housing.

11. The air blowing device of claim 1 , wherein a plan area of the impeller falls within a range from not smaller than ⅛ to not greater than ¼ of a plan area of the housing.

12. The air blowing device of claim 1 , wherein the impeller is centered at a region farthest from the outlet, the region is one of four regions equally divided both laterally and longitudinally across a plan area of the housing.

13. The air blowing device of claim 1 , wherein a distance from the tongue section to the outlet is 5 times or more of a radius of the tongue section.

14. The air blowing device of claim 1 , wherein the fan case is curved to protrude toward the inlet where the impeller exists.

Assignees

• Shirahama Seiji
• Satou Munetada
• Takada Masayuki
• Muromachi Kazuhiro
• Panasonic Ip Man Co Ltd

Inventors

• Shirahama Seiji
• Satou Munetada
• Takada Masayuki
• Muromachi Kazuhiro

Classifications

• F04D29/4226 Primary

  Fan casings · CPC title

• F04D27/009

  by bleeding, by passing or recycling fluid · CPC title

• F04D29/422

  Discharge tongues (F04D17/04 takes precedence) · CPC title