Specifications

The Patent Office Journal 17/12/2010
4501
(12) PATENT APPLICATION PUBLICATION (21) Application No.114/MUM/2009 A
(19) INDIA
(22) Date of filing of Application :19/01/2009 (43) Publication Date : 17/12/2010
(54) Title of the invention : AN EXTERNAL ROTOR AXIAL FLOW FAN
(51) International classification
:F04D19/00;
F04D25/08;
F04D29/00
(31) Priority Document No :NA
(32) Priority Date :NA
(33) Name of priority country :NA
(86) International Application No
Filing Date
:NA
:NA
(87) International Publication No :N/A
(61) Patent of Addition to Application Number
Filing Date
:NA
:NA
(62) Divisional to Application Number
Filing Date
:NA
:NA
(71)Name of Applicant :
1)CROMPTON GREAVES LTD
Address of Applicant :CG HOUSE, DR ANNIE BESANT
ROAD, WORLI, MUMBAI 400 030, MAHARASHTRA, INDIA.
(72)Name of Inventor :
1)KAMBLE DEEPAK
2)SHENOY TALACHERY PURUSHOTHAM
(57) Abstract :
An external rotor axial flow fan (1) comprising a shroud (2) having a cupshaped portion (3) at the back end thereof. The cupshaped
portion has an inwardly extending support portion (4) at the center thereof. An impeller (5) comprises a recessed impeller body (6)
having a plurality of impeller blades (7) on the outer surface thereof and an external rotor (8) located at the inner surface thereof and
an axially inwardly extending impeller shaft (9). The impeller shaft is rotatably held in the support portion of the cupshaped portion
with the edge of the recessed impeller body disposed over the edge of the cupshaped portion. A support sleeve (13) is disposed over
the impeller shaft and located against the support portion of the cupshaped portion. A controller comprising a printed circuit board
(14) with a hall sensor (20) is located over the support sleeve and a wound stator pack (21) located over the support sleeve and
disposed within the rotor describing a clearance with the rotor.
No. of Pages : 12 No. of Claims : 3