Unlock instant, AI-driven research and patent intelligence for your innovation.

Passive variable pitch system

A pitch system and passive technology, applied in the field of blades, can solve the problems of high cost and low reliability, and achieve the effects of low manufacturing cost and maintenance cost, good operation reliability and simple structure

Pending Publication Date: 2019-07-19
QINGDAO RANDALL AERODYNAMICS ENG LLC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a passive pitch control system, which solves the defects of low reliability and high cost of the automatic pitch control system in the prior art, realizes improving the reliability of the automatic pitch control system, and reduces its manufacturing cost and maintenance cost

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
  • Passive variable pitch system
  • Passive variable pitch system
  • Passive variable pitch system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0052] Such as Figure 18 As shown, the centrifugal force acting on all rotating blades is proportional to the square of the hub speed. The higher the RPM, the greater the centrifugal force pulling the blades away from the hub. This centrifugal force is countered by a linear spring that lengthens as the revs increase. When the spring is stretch...

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

The invention discloses a passive variable pitch system. The passive variable pitch system comprises a main shaft and a plurality of blades distributed around the axis of the main shaft, and is characterized by further comprising an elastic movable steering mechanism which is used for guiding the blades to deflect when the blades move relative to a blade cavity shell, and is used for applying elastic force to the blades, and a generator or a motor or an engine which is connected with a rotating shaft. According to the system, the optimal combination of the pitch angle and the rotation speed can be automatically obtained on different types of turbine machines, and a pure mechanical structure is adopted, so that the influence of power failure and an inaccurate wind speed meter or user erroris avoided, then the reliability, the strictness and the control efficiency of the system are improved, and the defects that an existing active control system is extremely complex and expensive are overcome.

Description

technical field [0001] The invention relates to blade technology, in particular to a passive pitch control system. Background technique [0002] At present, devices that use rotating blades to achieve power input or power output are widely used, for example, they are widely used in wind power generators, water turbines, screw propellers, turbines, rotary machines and other equipment. Wherein, since the blade is affected by the velocity of the fluid (gas or liquid) during the rotation process, it is usually necessary to adjust the pitch angle of the blade for different flow velocities. In the prior art, the pitch angle of the blades is usually adjusted by means of electronic control, and the pitch angle of the blades is adjusted by using a computer system to detect the wind speed. However, all of the above rely on several subsystems, such as computers, software, anemometers, thermometers, etc., which are easily affected by errors and failures, resulting in the overall system...

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
IPC IPC(8): F03D7/02F03D1/06
CPCF03D7/0224F03D1/065F03D1/0658Y02E10/72
Inventor 陈春梅瑞恩·迈克·兰德
Owner QINGDAO RANDALL AERODYNAMICS ENG LLC