Blower apparatus

Patent metadata

Field	Value
Publication number	US-2016169249-A1
Application number	US-201514950405-A
Country	US
Kind code	A1
Filing date	Nov 24, 2015
Priority date	Dec 16, 2014
Publication date	Jun 16, 2016
Grant date	—

Abstract

A blower apparatus of the type which comprises a body housing with air inlet and outlet ends, a cylindrical motor casing assembled within the body housing in such a manner as to permit therethrough airflow introduced into the air inlet end of the body housing and exhausted outwardly from the air outlet end of the body housing, an electric motor mounted within the motor housing, an axial-flow fan having a plurality of fan blades attached on a rotary drive shaft driven by the electric motor, wherein the number Z of fan blades of the axial-flow fan and the rated rotation speed n (r/s) of the rotary drive shaft under maximum power in normal operation of the blower apparatus are determined to satisfy the following correlation
Z·n≦2000 (provided, n>160).

First claim

What is claimed is:

1 . A blower apparatus of the type comprising a body housing with air inlet and outlet ends, a cylindrical motor casing assembled within the body housing in such a manner as to permit therethrough airflow introduced into the air inlet end of the body housing and exhausted outwardly from the air outlet end of the body housing, an electric motor mounted within the motor housing, an axial-flow fan having a plurality of fan blades attached on an output drive shaft driven by the electric motor,
wherein the number Z of fan blades of the axial-flow fan and the rated rotation speed n (r/s) of the rotary drive shaft under maximum power in normal operation of the blower apparatus are determined to satisfy the following correlation
Z·n≦ 2000 (provided, n> 160).

2 . A blower apparatus as claimed in claim 1 , wherein said electric motor is a brush-less DC electric motor, and wherein a rechargeable battery pack is detachably mounted on a rear portion of said body housing for supply of electric power to the electric motor.

3 . A blower apparatus as claimed in claim 2 , wherein said electric motor is activated under control of a signal applied from a rotation control circuit provided on an upper portion of said body housing.

4 . A blower apparatus as claimed in claim 1 , wherein said axial-flow fan has three fan blades, and the rated rotation speed n (r/s) is defined to be 367 (r/s)(22000 rpm).

Assignees

• Makita Corp

Inventors

• Takahashi Makoto
• Ojima Akira

Classifications

• F04D25/0673

  Battery powered · CPC title

• F04D29/325 Primary

  for axial flow fans (blade mountings F04D29/34, blades F04D29/38) · CPC title

• E01H1/08

  Pneumatically dislodging or taking-up undesirable matter {or small objects}({E01H1/006 and E01H1/005 take precedence;} suction cleaners in general A47L5/00 - A47L9/00; {sucking-off liquids or semi-liquids E01H1/108}); Drying by heat only or by streams of gas (permanently-installed heating or blowing devices E01C11/26; heating or drying for road- building or repairing E01C23/14; {devices for melting snow or ice in situ E01H5/10, E01H8/08; for scorching undesirable vegetation E01H11/00}); Cleaning by projecting abrasive particles (sand-blasting in general B24C; {roughening of road surfaces E01C23/08; cleaning of road joints E01C23/0906}) · CPC title

• F04D27/004

  by varying driving speed · CPC title

• F04D19/002

  Axial flow fans · CPC title