Title:
軸流送風機を備えた冷却塔
Document Type and Number:
Japanese Patent JP6673702
Kind Code:
B2
Abstract:
The invention provides a cooling tower having an axial-flow fan, by which reduction of actual negative pressrue area on the rear surface of a blade due to stripping of air flow is reduced, and static pressrue value is increased. A raised structure of the rear surface, as the negative pressrue side, of the blade is configured in the following manner: a first raised portion is formed at the position, from the 20-45% of width dimension, of the blade from the front end of rotation direction of the blade; a second raised portion is formed at the position, from the 65-85% of width dimension, of the blade from the front end of rotation direction of the blade; a sunk portion is formed at the position, from 45-65% of the width dimension, of the blade from the front end of rotation direction of the blade; in addition, on the first raised portion, the ratio of thickness to width of the blade in the direction, which is orthometric to a virtual line between two ends of the two ends, in width direction, of the blade is 6-20%, and relatively, on the second raised portion, the ratio value is 2-10%.
Inventors:
Michio Tatsumi
Application Number:
JP2016010278A
Publication Date:
March 25, 2020
Filing Date:
January 22, 2016
Export Citation:
Assignee:
Nihon Spindle Manufacturing Co., Ltd.
International Classes:
F04D29/38; F04D29/66; F28C1/10
Domestic Patent References:
| JP2013503999A | ||||
| JP2013011400A | ||||
| JP2004084524A | ||||
| JP2002317796A |
Attorney, Agent or Firm:
Osamu Mori
Tsutomu Inoue
Tsutomu Inoue