瑞典专利SE534941C2 Safety Propeller

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专利摘要:
A propeller (10, 110) has a hub (20, 120) with blades (40, 140). A safety member (50, 150) is disposed along at least a portion of the leading edge (43, 143) of each blade (40, 140); and the blades (140) may include anti-cavitation slots (160). Published with Figure 3.
公开号:SE534941C2
申请号:SE0950293
申请日:2007-09-25
公开日:2012-02-28
发明作者:Colin David Chamberlain
申请人:Colin David Chamberlain；
IPC主号:

专利说明:

In one aspect, the present invention relates to: a safety propeller, preferably intended for watercraft, of the type having a hub and a plurality of blades, each blade having a leading edge extending from a proximal end of the vehicle. the blade adjacent the hub to a distal end spaced from the hub; and a respective safety member disposed over at least 50% of the leading edge of each blade, each safety member having a greater thickness / circumference and / or higher height than the leading edge and at least a portion of the safety member extending from a traction or drive face on the blade in the forward direction of rotation of the propeller, which safety part can be placed with a center axis substantially parallel to or aligned with the leading edge where it is preferred that the central axis increasingly follows / runs on the leading edge of the blade in the direction from the proximal end to the distal end of the blade, and the safety member is preferably provided with a soft contour transition to the adjacent portion of the blade.
For a propeller, which rotates in a clockwise direction, (when viewed from the rear end of the hub), each safety member on each traction or drive front surface of the blade appears to be directed towards the rear end of the propeller.
The safety part preferably extends over more than 50% of the length of the leading edge of the blade and has a higher height so that the safety part will hit all obstacles before the remaining part of the leading edge which is not provided with the safety part. Although the safety member may have a constant height along the leading edge, it may have a relatively increasing height in the direction of the distal end of the blade.
The safety part can be mounted on the blade (eg by welding or soldering) or designed integrally with the blade.
The relative height of the safety part in relation to the leading edge of the blade; the relative thickness of the safety part in relation to the thickness of the blade; and / or the relative degree / extent / extent by which the center axis of the safety member follows / runs on the leading edge of the blade, may be varied to suit the specific intended application of the safety component. At least one anti-cavitation slot is preferably provided in each blade.
Each anti-cavitation slot can have a circular, square, rectangular or modified rectangular shape (ie a rectangle with semicircular ends) in plan view.
The side wall or each side wall of the anti-cavitation slot preferably extends through the blade substantially parallel to the axis of rotation of the propeller.
In a second aspect, the present invention relates to a propeller, preferably for watercraft, of the type having a hub and a plurality of blades, each blade having a respective leading edge and trailing edge extending from respective proximal ends of the blade adjacent the hub to a distal end spaced from the hub; and at least one anti-cavitation slot extending through each blade, spaced from the respective leading edge and trailing edge of the blade. The anti-cavitation slot or each anti-cavitation slot may have a circular, square, rectangular or modified rectangular shape (ie a rectangle with semicircular ends) or other shape in plan view.
The side wall or each side wall of the anti-cavitation slot is preferably substantially parallel to the axis of rotation of the hub.
The anti-cavitation slot or each anti-cavitation slot is preferably located at a distance of at least 50% of the distance between the leading edge and the trailing edge of the blade measured at the hub.
The anti-cavitation slot or any anti-cavitation slot is preferably located at a distance of 20% to 70 ° /> of the distance from the hub to the distal end of the blade.
For the anti-cavitation slits of square, rectangular or modified shape, the opposite side walls of the anti-cavitation slits preferably extend substantially parallel to a central axis of the slits, which axis extends substantially radially from the hub.
In a third aspect, the present invention relates to a safety propeller according to the first aspect, which comprises the anti-cavitation slots according to the second aspect.
Brief Description of the Drawings In order to enable full understanding of the invention, preferred embodiments will now be described with reference to the accompanying drawings, in which: Figs. 1 and 2 are respective front and rear plan views of a first embodiment of a propeller in accordance with with the present invention; Figs. 3 and 4 are a respective perspective view and a side plan view of the first embodiment; Fig. 5 is a front perspective view of the first end molding showing cross-sectional views of a blade taken along lines A-A and E-E, respectively; Fig. 6 is a front view of a second embodiment of a propeller in accordance with the present invention; Figs. 7 and 8 are a respective perspective view and a side plan view of the second embodiment; Fig. 9 is a cross-sectional view taken along line a-a of Fig. 8; and Fig. 10 is a front plan view showing three (3) alternative shapes of the anti-cavitation slots according to the second embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment shown in Figs. 1 to 5, a "shelf / bearing propeller" has had each of its 3 blades modified to incorporate the safety parts of the present invention. It will be clear to the person skilled in the art that the safety parts can be manufactured integrated with the blades; and that the number, size and shape of the blades of the propeller will depend on the intended application (s) of the particular safety propeller manufactured in accordance with the present invention.
In the specific embodiment shown, the propeller 10 has a hub 20 with three (3) equally spaced blades 40 and will be described in more detail below.
The hub 20 has an outer tubular body 21, which is widened in the outward direction to a rear edge 22.
An inner tubular body 23 is connected to the outer tubular body 21 by three (3) spaced edges / walls 24; where the outer body 21, the inner body 23 and the partitions 24 define three (3) outflow openings / channels 25 through the hub 20.
The inner body 23 has a tubular vibration damping body 26, which supports a splined tubular drive body 27 which is mountable on the output shaft (not shown) of a suitable power source (e.g., an outboard / inboard / outboard drive or the drive shaft or propeller shaft of an inboard engine). .
Each blade 40 has a curved leading edge 41 with a proximal end 42 near the hub 20 and a distal end 43 at the periphery of the blade 40, where the distal end 43 leads into / merges into the trailing edge 44 of the blade.
A recess / recess 45 is machined into the leading edge 41 of the blade along approximately 70-80% of the length of the leading edge. In the specific example described below, the depth of the recess 45 is approximately 4-5 mm, where the safety part 50 described below is formed by a rod or a cylinder with a diameter of 6 mm.
Those skilled in the art will appreciate that the depth of the recess 45 may be as shallow as, for example, 1 mm, so that the relative height of the safety member 50 relative to the leading edge 41 of the blade 40 may be varied to suit the specific intended application when the safety member 50 is made of a specific thickness or diameter.
The safety member 50 in the present example is formed of an aluminum bar length 6 mm in diameter, which bar is located in the recess 45 and where the central axis of the safety member 50 is progressively laid / moved along the leading edge 41 of the blade 40 in the direction from the proximal end 42 to the distal end 43. (As described hereinbefore, in side view, the safety member 50 extends toward the rear of the traction or drive front surface of the blade 40, i.e., toward the rear end of the hub 20.).
For a counterclockwise rotating propeller, the propeller will be a "mirror image" of the propeller shown. Although it is preferred that the center axis of the safety member 50 extend progressively from the leading edge 41 of the blade 40 toward the proximal end 42 to the distal end 43, this is not necessary for the invention, and the central axis may be parallel to or aligned with leading edge 41 of the blade. In experiments performed with the propeller according to the first embodiment shown in Figs. 1 to 5 of the drawings have no loss in power / performance in the forward direction compared to the propeller before modification (and it has in fact, there has been a minimal increase in speed). Furthermore, there is a small, if any, loss in efficiency of the modified propeller when driven in the reverse direction.
The profile of the safety part 50 is "mixed" or "contoured" in the profile of the blade 40 near the safety part 50. Although the safety part 50 in this embodiment has been made of a solid rod, it could be made of eg sawn and processed wood products or materials with U-shaped cross section.
It will be apparent to those skilled in the art that the safety member 50 may be formed integrally with each blade during manufacture.
The safety part 50 may be made of the same material as the propeller, such as metal (eg aluminum), plastic (which may be fiber reinforced), "Kevlar" (trademark), carbon fiber or other suitable material or may be made of material selected e.g. impact strength. In experiments performed on very shallow water, it has been found that the blades 40 do not cut into the underlying bed / bottom, instead the propeller 10 tends to "travel" over the bottom until deeper water has been reached. Furthermore, little, if any, damage was noted to the blades 40 (or the safety part SO), which minimizes imbalances in the propeller 10 or potential sites for blade breakage. Although the security member 50 may be provided over the entire length of the leading edge of each blade 40, it is preferred that the security member extend along such a portion of the leading edge 41 so that the security member 50 will hit all obstacles before the rest of the leading edge 41 contacts it. .
If preferred, the safety member 50 may extend past the distal ends 43 of the blades 40 and thereby extend a short distance along the trailing edges 44.
Figs. 6 to 9 show a second embodiment of the propeller 110, where the three blades 140 (around the hub 120) have a substantially rectilinear / straight, trailing edge 144.
The security portion 150 extends along the leading edge 143 of each blade 140 in the manner previously described herein with reference to the first embodiment of Figs. 1 to 4.
As shown in Fig. 7 and 8, the safety member 150 extends from the traction or drive front surface 149 of each blade 140 so that, seen in side view, it extends from the leading edge 143 of the blade 140 toward the rear end 122 of the hub 120.
In this embodiment, an anti-cavitation slot 160 is disposed in each blade 140 approximately midway between the leading and trailing edges 143, 144, and disposed at approximately 50% of the radial distance from the hub 120.
Each anti-cavitation slot 160 has a longitudinal axis which is substantially radial with respect to the centerline (or axis of rotation) of the hub 120. In this embodiment, each anti-cavitation slot 160 has a modified rectangular shape with parallel side walls. 161, 162 which are interconnected by semicircular end walls 163, 164.
As shown in Fig. 9, the side walls 161, 162 run substantially parallel to the center line of the hub 120 and are angled / inclined towards the opposite front surfaces of the blade 140.
In tests performed with a propeller 110 in accordance with this embodiment, it has been shown that the propeller is marginally / slightly, if at all, affected by cavitation over a wide range of operating conditions and thereby minimizes all losses due to cavitation, eg at high engine speeds or in case of sudden acceleration. Furthermore, the propeller has good performance when chopping.
Pig. 10 shows alternative shapes of the anti-cavitation slots including rectangular (260), square (360) and circular (460).
In another alternative, which is not shown, the anti-cavitation slots may be “hook / hook shaped” and may follow the shape of the blades.
The size, shape and location of the anti-cavitation slot type 160, 260, 360, 460 on the blades 140, 240, 340, 440 can be varied to suit the specific intended application.
In addition, the side walls of the anti-cavitation slots may be angled / inclined in the forward or backward direction or be perpendicular to the opposite / opposite front sides of the blades.
The propeller 11 has the dual advantages of the safety member 150 which has the anti-cavitation slots 160 to provide a propeller which is safe in operation and has no deterioration in performance or even improved performance over existing propellers.
Various changes and modifications may be made to the described embodiments shown without departing from the present invention as defined in the appended claims.

权利要求:
Claims (12)
[1]
A safety propeller (10) for water craft of the type having a hub (20) and a plurality of blades (40), each blade having a respective leading edge (41) and a trailing edge (44) extending from the respective proximal ends (42) of the blade adjacent the hub to a distal end (43) spaced from the hub; and a safety member (50) disposed over at least 50% of the leading edge (41) of each blade (40), characterized in that each safety member (SO) has a greater thickness and / or higher height than the leading edge (41), and at least a portion of the safety member (50) extends from a traction or drive front surface of the blade (40) in the forward direction of rotation of the propeller (10), with a center axis of the safety member substantially parallel to or aligned with the leading edge (41) or with the the central axis that increasingly leads the leading edge of the blade in the direction from the proximal end (42) to the distal end (43) of the blade, and the safety member (50) has a soft contour transition into an adjacent rear surface of the blade (40).
[2]
A propeller (10) according to claim 1, wherein the safety member (50) on each traction or drive front surface of the blade (40) of a propeller, which propeller rotates in a clockwise direction (when viewed from a rear end of the hub) , appears to be directed toward the rear end of the propeller.
[3]
A propeller (10) according to claim 1 or 2, wherein the safety part (50) extends over more than 50% of the length of the leading edge (41) of the blade (40) and has a higher height so that the safety part will hit all obstacles before the remainder of the leading edge which are not provided with the safety part.
[4]
A propeller (10) according to claim 3, wherein the safety member (50) has a constant height above the leading edge (41) or has a relatively increasing height towards the distal end (43) of the blade (40).
[5]
A propeller (10) according to any one of claims 1 to 4, wherein the safety part (50) is mounted on the blade (40) or formed integrally with the blade.
[6]
A propeller (10, 110) according to any one of claims 1 to 5, wherein at least one anti-cavitation slot (160, 260, 360, 460) is provided in each blade (40).
[7]
A propeller (10, 110) according to claim 6, wherein each anti-cavitation slot (160, 260, 360, 460) has a circular, square, rectangular or modified rectangular shape in plan view.
[8]
A propeller (10, 110) according to claim 7, wherein the side wall or each side wall of the anti-cavitation slot (160, 260, 360, 460) extends through the blade (40) substantially parallel to the axis of rotation of the propeller.
[9]
A propeller (10, 110) according to claim 7, wherein the side wall or each side wall of each anti-cavitation slot (160, 260, 360, 460) extends substantially parallel to the axis of rotation of the hub (20).
[10]
A propeller (10, 110) according to any one of claims 7 to 9, wherein the anti-cavitation slot or each anti-cavitation slot (160, 260, 360, 460) is located at a distance of at least 50% of the distance between the leading edge (41) and the trailing edge (44) of the blade (40) measured at the hub (20).
[11]
A propeller (10, 110) according to any one of claims 7 to 10, wherein the anti-cavitation slot or each anti-cavitation slot (160, 260, 360, 460) is located at a distance of at least 20% to 70% of the distance from the hub (20) to the distal end (43) of the blade (40).
[12]
A propeller (10, 110) according to claim 9, wherein the opposing side walls of the anti-cavitation slots (160, 260, 360, 460), for anti-cavitation slots of square, rectangular or modified shape, extend substantially parallel to a center axis of the slots, which axis extends substantially radially from the hub (20).

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同族专利:

公开号 | 公开日

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引用文献:

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FI126594B|2014-11-06|2017-02-28|OutotecOy|propeller|

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CN108820175B|2017-09-20|2019-12-17|航天晨光（福建）管业科技有限公司|Cutting type anti-winding marine propeller|

KR102150102B1|2018-04-03|2020-08-31|필드지 주식회사|Ship propeller|

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法律状态:
2020-05-05| NUG| Patent has lapsed|

优先权:

申请号 | 申请日 | 专利标题

AU2006905421A|AU2006905421A0|2006-10-02|Safety propeller|

AU2006233263A|AU2006233263B2|2006-10-02|2006-10-30|Safety propeller|

PCT/AU2007/001448|WO2008040049A1|2006-10-02|2007-09-25|Safety propeller|

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