Title:
AIR DUCT
Document Type and Number:
Japanese Patent JP3910283
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To compensate for decrease in the volume of air flowing through a duct by providing a gap between a throat formed by drawing an upstream side duct tubularly and a large diameter downstream side duct covering the throat.
SOLUTION: An upstream side duct 1 is drawn tubularly to form a throat 2 being inserted into a downstream side duct 4. A gap 5 is formed between the throat 2 and a large diameter duct 4 covering it in order to conduct between the inside of the duct and the outdoor air. A cone part 3 is tapered as gently as possible. During a process where the outdoor air from the upstream side duct 1 passes through the cone part 3 thence through the throat 2, pressure energy of fluid is converted partially into kinetic energy to produce sucking action and the pressure in a suction chamber R is reduced. Consequently, the outdoor air is sucked through the gap 5. The air volume Q1 of the upstream side duct 1 is added with the air volume Q2 from the gap 5 and the air volume Q3 of the downstream side duct 4 is increased to Q1+Q2.
Inventors:
Hitoshi Imura
Masahiro Hajiri
Masahiro Hajiri
Application Number:
JP36782897A
Publication Date:
April 25, 2007
Filing Date:
December 26, 1997
Export Citation:
Assignee:
Inoac Corporation
International Classes:
B60S1/54; F24F7/06; B60H1/00; B60H1/34; B60K37/00; F04F5/18; (IPC1-7): F24F7/06; B60H1/00; B60H1/34; B60K37/00; B60S1/54; F04F5/18
Domestic Patent References:
| JP61089741U | ||||
| JP939610A |
Attorney, Agent or Firm:
Yoshinobu Kobayashi