Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Propeller

A technology of propellers and blades, applied in the field of propellers

Inactive Publication Date: 2007-02-07
MICHAELLA K CORP
View PDF1 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A disadvantage of the two known propellers is that each design of the propeller generates high aerodynamic loads acting on it, which leads to the necessity of providing its high strength and stiffness

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Propeller
  • Propeller
  • Propeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The propeller has a main shaft 1 on which at least two hubs 2 are arranged, and the main shaft 1 has blades 3 uniformly fixed on the circumference of each hub. The number of hubs with blades 3 can be different. The blades 3 on each sequential hub 2 can be fixed with the possibility of rotation in opposite directions, and with the possibility of rotation in one direction. This rotation can be performed by a motor through a drive shaft and a gear train.

[0017] Each blade 3 has a sharp front edge 4 and a sharp rear edge 5 and is configured along the extension of the blade 3 to have a maximum thickness (0.10-0.25) b of the profile, where b is the length of the local chord of the blade 3 .

[0018] In each blade 3 the maximum thickness 6 of the profile is located in the middle of each partial chord.

[0019] The profile can have different shapes, eg biconvex, wedge, rhombus. Profiles of different shapes can be formed along the extension of the blade.

[0020] Each blad...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A propeller has a shaft 1 with at least two hubs 2 arranged on it, with blades 3 fixed on each of the hubs. Each blade 3 has sharp front and rear edges and configured along an extension of the blades with a maximum thickness of profiles (0.10-0.25)b, wherein b is a length of a local chord of the blade 3. In each of the blades 3 a maximum thickness 6 of the profile is located in a middle of each local chord and twisted relative to an axis 8, extending through a middle of local chords along the extension of the blade 3. The blades 3 can be fixed on each of the hubs 2 inclinedly to a radius of the hub 2 at an angle < 90 , which leads to a reduction of local aerodynamic resistance and reduction of aerodynamic loads. The propeller can be provided with an immovable cylindrical casing, surrounding all the blades 3 and moved out forwardly of the blades of the front hub 2 not less than by a length of the blade, which increases a value of a torque.

Description

technical field [0001] The invention relates to propellers, which can be used in the fields of aviation and special transport (thruster skids, air-supported dirigibles). Background technique [0002] Known propellers have a main shaft on which two hubs are mounted, and the main shaft has blades fixed uniformly over the circumference on each hub. The blades on the two hubs are rotationally driven in opposite directions by motors (U.S. Patent no. 2953320 U.S. Cl.: 244-12, 1960). [0003] Known propellers have a main shaft on which two hubs are mounted, and the main shaft has blades fixed uniformly over the circumference on each hub. The blades of the two hubs are rotationally driven in opposite directions by motors (RU patent no. 2062246, IPC: B64C29 / 00, 1996). [0004] A disadvantage of the two known propellers is that each design of the propeller generates high aerodynamic loads acting on it, which leads to the necessity of providing its high strength and rigidity. Conte...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B64C11/48B64C11/18B64C11/00
CPCB64C11/18B64C11/48B64C11/001
Inventor A·I·阿卡罗A·M·泽林斯基M·M·梅德维德夫
Owner MICHAELLA K CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com