An Eccentric Control Mechanism and Realization Method of a Pitch Adjustable Straight Wing Propeller

A technology of eccentric control and thrusters, applied in the direction of rotary propellers, etc., can solve the problems of limiting the practicality of straight-wing propellers, increasing the weight of the turntable, and large installation space, etc., achieving excellent maneuverability, reducing the total weight, reducing Effect of small installation space

Active Publication Date: 2018-04-03
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic control mechanisms for adjustable pitch mainly include "planetary cam mechanism" and "eccentric disc-slider-link mechanism", but the cam and eccentric disc mechanisms require a large installation space and increase the weight of the turntable
Limits the practicality of straight-wing propellers

Method used

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  • An Eccentric Control Mechanism and Realization Method of a Pitch Adjustable Straight Wing Propeller
  • An Eccentric Control Mechanism and Realization Method of a Pitch Adjustable Straight Wing Propeller
  • An Eccentric Control Mechanism and Realization Method of a Pitch Adjustable Straight Wing Propeller

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Embodiment

[0077] In order to more fully understand the features of the invention and its applicability to engineering practice, the present invention is aimed at verifying the eccentric control mechanism of the double-slider linkage of the 5-bladed straight-wing propeller, and simplifies the mechanism. Figure 11 shown. Due to the blade and connecting rod l 7 The angle between them is a fixed value such as Image 6 shown. Therefore, find the control point and link l 7 functional relationship between them.

[0078] Due to the symmetry of the structure, only the linkage mechanism of one blade is analyzed, and the analytical solution of the swing angle of each rod of the multi-link mechanism with respect to the rod length can be obtained:

[0079]

[0080]

[0081]

[0082]

[0083]

[0084]

[0085] where θ 2 =θ 3 ,

[0086] A=l 5 -l 1 cosθ 1

[0087] B=-l 1 sinθ 1

[0088]

[0089] D=l 8 -l 45 cosθ 45

[0090] E=-l 45 sinθ 45

[0091] F=D 2 ...

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Abstract

The invention discloses an adjustable-screw pitch straight wing propeller eccentricity control mechanism and a realizing method. Aiming at the problems that a blade attack angle control mechanism of a straight wing propeller is relatively complicated and the using performance and the economic performance of the straight wing propeller are limited, the invention provides a blade control mechanism formed by a set of double slide blocks connecting rod mechanisms. Double blocks are control point control mechanisms, the connecting rods are connected with the control points and blades, a rotating shaft linear equation that a chord line is vertical to all blades and passes through the blades is established, and an intersection point of the rotating shaft linear equation is solved as an eccentric point, so that the control mechanism is realized. The device is mainly a connecting rod mechanism, and the weight of the device and the complexity degree of the device are reduced; because of the arrangement of the double blocks, the control input of the control points is simple, and meanwhile, adjustable screw pitch is realized, and the propelling efficiency is increased.

Description

technical field [0001] The invention is an improvement of the marine straight-wing propeller, and mainly adopts the double sliding block and the multi-link mechanism to replace the original cam mechanism to realize the eccentric control mechanism and the realization method. It involves the design of the link mechanism and the kinematic analysis of the link, and mainly realizes the process of controlling the movement trajectory of the control point to achieve the control of the blade swing angle to determine the position of the eccentric point and the size of the eccentricity. Background technique [0002] A straight-wing thruster is a special form of marine thruster. When the blade rotates around the center of the runner with the runner, it swings around its own axis. During the rotation of the blade, its chord line is always perpendicular to the line connecting the blade axis and the eccentric point. The design idea of ​​the straight-wing thruster originated in the ninete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63H1/08
CPCB63H1/08
Inventor 王晓军田靖军王磊耿新宇马雨嘉
Owner BEIHANG UNIV
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