| (19) |
 |
|
(11) |
EP 1 087 146 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
03.04.2002 Bulletin 2002/14 |
| (43) |
Date of publication A2: |
|
28.03.2001 Bulletin 2001/13 |
| (22) |
Date of filing: 15.09.2000 |
|
| (51) |
International Patent Classification (IPC)7: F04D 29/38 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
24.09.1999 JP 27083099
|
| (71) |
Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
|
Kadoma-shi, Osaka 571-8501 (JP) |
|
| (72) |
Inventors: |
|
- Izumi, Yoshiki
Kyoto-shi, Kyoto 607-8342 (JP)
- Sugio, Takashi
Kusatsu-shi, Shiga 525-0046 (JP)
|
| (74) |
Representative: Kügele, Bernhard et al |
|
Novagraaf SA 25, Avenue du Pailly
1220 Les Avanchets - Geneva
1220 Les Avanchets - Geneva (CH) |
|
| |
|
| (54) |
Impeller for fan, fan using the same, and air conditioner using the same |
(57) It is intended to lessen the effect of the blade end vortex of air generated on the
negative pressure surface near the outer circumference of a rotating blade given to
the influent air state on other blade rotating behind when it is separated from this
blade and flows away. As a result, disturbance of influent air on each succeeding
blade is reduced. The influent air coming into each blade is smooth. Unstable phenomena
in the succeeding rotating blade such as air separation and decline of speed hardly
take place. Accordingly, the blade noise is lowered and the static pressure is enhanced.
An impeller (1, 15, 16, 40) has a hub (3, 13) and two blades (2, 14) disposed in the
hub. Specifically, each blade has a shape with an aspect ratio (b/L) defined in a
range of b/L≤1 where "L" is the chord length of the blade at a representative square
mean radius (Rr) position of each blade of the two blades and "b" is the representative
actual length in the radial direction.