GB758466A - Improvements in fan impellers - Google Patents
Improvements in fan impellersInfo
- Publication number
- GB758466A GB758466A GB110454A GB110454A GB758466A GB 758466 A GB758466 A GB 758466A GB 110454 A GB110454 A GB 110454A GB 110454 A GB110454 A GB 110454A GB 758466 A GB758466 A GB 758466A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blades
- root
- blade
- tip
- curved
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
758,466. Screw fans. KEITH BLACKMAN, Ltd., and WOODLEY, D. S. Jan. 12, 1955 [Jan. 14, 1954], No. 1104/54. Class 110(1) In a fan impeller having three blades, the chord pitch angle of each blade decreases from root to tip to give a substantially constant geometric pitch, and the blade surfaces in contact with the air are compoundly curved. 'In the fan impeller shown in Fig. 3, the blades 26 are attached to cast or fabricated supports 25 which are positioned at the required angle on flat surfaces 24 of the impeller hub 23. Each blade is pressed or fabricated of sheet metal, plastic or other material, or cast, and is of fully curved profile, and the working surfaces are of anticlastic curvature. The chord pitch angle decreases from root to tip to provide a substantially constant geometric pitch, and the root diameter is about 27 per cent of the tip diameter. The leading edge 30 of each blade is heavily curved forwardly from root to tip in the direction of rotation, while the trailing edge is lightly curved backwardly. Both edges 30, 31 are inclined slightly forwardly in an axial direction. In a modification, the blades are flanged at the roots for attachment to the hub. In a further modification, the blades are formed integral with one another and are attached to a flanged hub. According to the Provisional Specification, there may be four blades.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB110454A GB758466A (en) | 1954-01-14 | 1954-01-14 | Improvements in fan impellers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB110454A GB758466A (en) | 1954-01-14 | 1954-01-14 | Improvements in fan impellers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB758466A true GB758466A (en) | 1956-10-03 |
Family
ID=9716224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB110454A Expired GB758466A (en) | 1954-01-14 | 1954-01-14 | Improvements in fan impellers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB758466A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11002292B2 (en) * | 2016-11-18 | 2021-05-11 | Mitsubishi Electric Corporation | Propeller fan and refrigeration cycle device |
-
1954
- 1954-01-14 GB GB110454A patent/GB758466A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11002292B2 (en) * | 2016-11-18 | 2021-05-11 | Mitsubishi Electric Corporation | Propeller fan and refrigeration cycle device |
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