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Quiet propeller

A propeller, noiseless technology, applied in the direction of rotary propellers, machines/engines, non-variable pumps, etc., can solve problems such as rotational energy loss

Active Publication Date: 2008-11-05
BELLSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Torsion of water flow and cavitation cause loss of rotational energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] Embodiments of the present invention will be described below. figure 1 is the rear view of the noiseless thruster according to the present invention, figure 2 is the top plan view. The propeller 1 comprises four propeller blades 2 equally spaced around the punch 1a. The number of propeller blades 2 is not limited to four.

[0036] The base-to-tip lengths of the individual propeller blades 2 are substantially equal to each other. Between the first side 2c and the second side 2d is a bending line 2a.

[0037] From the bending line 2a, a tapered warped end portion 2b is formed.

[0038] The bent end portion 2b is bent from the bending line 2a.

[0039] Depending on the length of the blade 2b, the angle of the warped end 2b can vary between 15° and 45°.

[0040] exist figure 2 Among them, the warped tip 2b is 15% of the blade length, but can vary from 15% to 60%.

[0041] exist figure 1 In , the diagonal line 2e extends from the end of the first side 2c of the bl...

Embodiment approach 2

[0054] image 3 is a rear view of a second embodiment of a propeller according to the invention, Figure 4 is its top plan view.

[0055] In the second embodiment, the bending line 2 a of the propeller blade 2 is located at a distance of 40% of the propeller 1 radius from the peripheral end. The length of the warped end 2b is 40% of the length of the blade 2 or the radius of the propeller. But not limited to this.

[0056] The warped rear surface 2f and the warped end portion 2b having the pitch angle P are wider than those of the first embodiment so that the pushing amount of water can be increased. The length of the warped end portion 2 b is set to be 15% to 60% of the length of the blade 2 . If the warped end 2b is longer, the warped angle of the warped end 2b can be smaller.

Embodiment approach 3

[0058] Figure 5 is a rear view of a third embodiment of the thruster, Figure 6 is the top plan view. The description of the same components as those of the previous embodiment denoted by the same reference numerals will be omitted.

[0059] exist Figure 5 In the third embodiment, the distal end of the second side 2d of the propeller blade 2 contacts the bending line 2a. A diagonal line 2e extends from the aforementioned contact point to the proximal end of the first side 2c.

[0060] exist Figure 6 Among them, the first side 2c gradually becomes thinner from the punch 1a to the periphery of the pusher 1 . The propeller blades 2 are warped forward to form a pitch angle P with respect to the diagonal 2e. exist Figure 6 , the pitch angle P is in the range of 7 degrees to 25 degrees.

[0061]In the third embodiment, the pitch angle is not formed close to the center of the propeller 1 . Therefore, in high speed rotation, there is neither cavitation nor eddy current. ...

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Abstract

The invention provides a quiet propeller (1) including a propeller (1) blade having such a pitch angle not at its root portion but at its blade end edge portion with respect to a relative flow in the rotational direction, as to raise the internal pressure of a liquid thereby to eliminate a cavity, a water bubble or a cavitation at the blade root portion at the time of a high-speed rotation so that the propeller (1) is rotated at a high speed by a small prime mover and by a prime mover capable of moving much fluid backward. In the quiet propeller, a propeller blade (3) is curved backward at its leading end portion to form a slope portion (3d), and a rotational front side (3a) end portion in the slope portion (3d) is formed into an arcuate shape in the side view whereas a rotational rear side (3b) end portion is so gradually extended backward from the rotational front side end portion as to become straight from the blade root to the blade end, thereby to form a deflecting slope face (3e). At the rotating time, the fluid is pushed toward the back axis from the deflecting slope face (3e) in the slope portion.

Description

technical field [0001] The present invention relates to a noiseless propeller, in particular to a noiseless propeller comprising a plurality of helical blades having pitch angles to increase pressure to the center of the propeller during high-speed rotation without creating cavitation, Air bubbles or air pockets, allowing high speed rotation using a small motor and pushing large volumes of fluid backwards. Background technique [0002] In a conventional screw propeller for underwater propulsion, blades are inclined with respect to a main shaft at a portion near the center of the propeller, and the blades are twisted from the center to the periphery. [0003] Japanese patent JP8-72794A discloses a high-speed propeller in which the blades are twisted backwards. [0004] In a conventional screw propeller for a ship, the pitch angle is large at a portion near the center of the propeller, so the propeller is thick, and the water flow is twisted as the propeller rotates. [0005...

Claims

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Application Information

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IPC IPC(8): B63H1/18F04D29/38B63H1/26
Inventor 铃木政彦
Owner BELLSION
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