Variable diameter screw propeller

A propeller and variable technology, applied in the direction of propellers, aircraft parts, transportation and packaging, etc., can solve the problems of increasing the overall weight of the propeller and increasing the complexity of the propeller control system, so as to improve the adaptability of high and low altitude flight and increase the range of diameter change , Improve the effect of aerodynamic performance

Inactive Publication Date: 2013-02-20
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pitch adjustment is to adjust the pitch according to the height or thrust requirements, and then lock the pitch, which requires a closed-loop control of the pitch adjustment device and the pitch locking device. These adjustment mechanisms are usually structurally independent of the propeller drive device, which not only increases The complexity of the propeller control system and more importantly increases the overall weight of the propeller, which is very detrimental to the already demanding weight requirement
Combined with the small changes in stratospheric high-altitude weather and few working conditions, some high-altitude low-dynamic aircraft also consider adopting variable speed from the perspective of economy and control systems, but this method will put higher demands on the high-altitude and low-altitude working performance and heat dissipation of the motor. Require

Method used

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  • Variable diameter screw propeller
  • Variable diameter screw propeller
  • Variable diameter screw propeller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The mechanism in this example realizes the telescopic movement of the blade through two-dimensional motion (rotation and compression), so that the diameter of the propeller disk can vary by nearly two diameters of the hub. The specific structure is as follows:

[0043] Such as Figure 3A , 3B As shown, the linkage mechanism 1 of the present invention is mainly composed of four parts, the waist link 101 , the bottom link 102 , the push rod 103 and the guide rod 104 . Among them, the waist connecting rod 101 and the bottom connecting rod 102 constitute an isosceles triangle connecting rod mechanism, which plays the role of rotation deformation and compression deformation; and the push rod 103 and guide rod 104 constitute a sliding connecting rod mechanism, which plays a role of pushing and sliding guiding. role. The isosceles triangle connecting rod mechanism is installed on the lead screw 210 with the central axis of the spinner cap 5 as the rotating shaft through the...

Embodiment 2

[0056] Of course, the structure of the present invention can only be realized by adopting the rotation method in Embodiment 1 when the diameter of the propeller does not require much change. At this time, the structure has little change compared with Example 1, and the difference is only reflected in the drive mechanism and the connecting rod mechanism. The specific structure is described as follows:

[0057] Drive mechanism 2 comprises motor 201, worm screw 202, worm screw fixed seat 203, worm wheel 204, worm wheel fixed shaft 205, differential gear 206, upper end bevel gear 208, rotating arm 209, rotating shaft and gear support seat 212; Motor 201 is fixedly installed on On the inner bottom surface of the propeller hub 4, the output shaft of the motor 201 is connected to the worm 202, and the two ends of the worm 202 are installed on the worm fixing seat 203, and the worm fixing seat 203 is installed on the inner bottom surface of the propeller hub 4; the worm wheel 204 is in...

Embodiment 3

[0060] Other possible institutional implementations:

[0061] In the above-mentioned two embodiments, the lock release mechanism adopts the armature and the spring to control the expansion and contraction of the pin, so as not to add an extra power source to the mechanism. Of course, if the structure permits, the expansion and contraction of the pin can be realized by means of a motor controlling the cam, or the expansion and contraction of the pin can be achieved by using the motor to control the rotation of the lead screw through the nut matched with the lead screw.

[0062] The motor, worm gear and worm gear in the driving mechanism in the above two embodiments can adopt motor, bevel gear meshing and other modes, as long as the output of the motor can drive the rotation of the differential gear.

[0063] As a further improvement, the number, diameter, and width of propeller blades can be comprehensively improved according to the characteristics of high and low altitude atmo...

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PUM

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Abstract

The invention relates to a variable diameter screw propeller, which comprises propeller blades (3) and propeller hubs (4), and further comprises a rod connection mechanism (1), a drive mechanism (2), a propeller cap (5), a slide support mechanism (6) and a locking releasing mechanism (7), wherein the propeller cap (5) is arranged on the propeller hub (4), and provides installation spaces and top supports for the rod connection mechanism (1), the drive mechanism (2), the slide support mechanism (6) and the locking releasing mechanism (7), the drive mechanism (2) and the slide support mechanism (6) are fixed on the propeller hub (4), an output shaft of the drive mechanism (2) is connected with the rod connection mechanism (1), the propeller blades (3) are fixed on a guide outlet end of the rod connection mechanism (1), the bottom of the guide outlet end of the rod connection mechanism (1) is connected with the slide support mechanism (6), the slide support mechanism (6) provides support and guide for the rod connection mechanism (1), the drive mechanism (2) drives the rod connection mechanism (1) to drive the propeller blades (3) along the slide support mechanism (6) to stretch along a diameter direction of the screw propeller so as to change a diameter of the whole screw propeller disc, and the rod connection mechanism (1) is locked through the locking releasing mechanism (7) after the propeller blades (3) stretch in place.

Description

technical field [0001] The invention relates to a novel high-performance propeller device with a variable-diameter mechanism that has strong adaptability and reliability to high and low-altitude flight environments and can be used in low dynamic aircraft propulsion systems. Background technique [0002] With the advancement of modern science and technology, the unique resource advantages of adjacent space have become the focus of attention of all countries. In recent years, driven by the needs of regional disaster prevention and reduction, environmental monitoring, and communication, military powers such as the United States and Europe have been working hard to develop adjacent space resources. Dynamic aircraft has become one of the most active aircraft researches today, which mainly includes high-altitude unmanned aerial vehicles and high-altitude airships. It can be seen from the design schemes of foreign advanced high-altitude unmanned aerial vehicles and high-altitude a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C11/28
Inventor 马蓉李振新李博李勇宋坚范春石杜庆安莫丽东姚伟
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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