U.S. patent application number 13/845803 was filed with the patent office on 2014-09-18 for all-speed-range propeller having stern fins.
This patent application is currently assigned to Ship and Ocean Industries R&D Center. The applicant listed for this patent is SHIP AND OCEAN INDUSTRIES R&D CENTER. Invention is credited to Kuan-Kai Chang, Shang-Sheng Chin, Ching-Yeh Hsing, Ya-Lin TSAI.
Application Number | 20140273673 13/845803 |
Document ID | / |
Family ID | 51529126 |
Filed Date | 2014-09-18 |
United States Patent
Application |
20140273673 |
Kind Code |
A1 |
TSAI; Ya-Lin ; et
al. |
September 18, 2014 |
ALL-SPEED-RANGE PROPELLER HAVING STERN FINS
Abstract
An all-speed-range propeller having stern fins comprises an
all-speed-range propeller installed on a propelling shaft of a
boat, and a plurality of stern fins installed between the
all-speed-range propeller and a hull of the boat. When the
all-speed-range propeller having stern fins is applied to the
oblique boat on which the propelling shaft is disposed obliquely,
the stern fins directly guide the water flow toward the
all-speed-range propeller, so that the uneven inflow caused by the
obliquely-designed propelling shaft can be conquered to promote the
operating efficiency of the all-speed-range propeller.
Inventors: |
TSAI; Ya-Lin; (New Taipei,
TW) ; Hsing; Ching-Yeh; (New Taipei, TW) ;
Chin; Shang-Sheng; (New Taipei, TW) ; Chang;
Kuan-Kai; (New Taipei, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHIP AND OCEAN INDUSTRIES R&D CENTER |
New Taipei |
|
TW |
|
|
Assignee: |
Ship and Ocean Industries R&D
Center
New Taipei
TW
|
Family ID: |
51529126 |
Appl. No.: |
13/845803 |
Filed: |
March 18, 2013 |
Current U.S.
Class: |
440/66 |
Current CPC
Class: |
B63H 5/15 20130101; B63H
23/34 20130101; B63H 1/28 20130101 |
Class at
Publication: |
440/66 |
International
Class: |
B63H 5/07 20060101
B63H005/07 |
Claims
1. An all-speed-range propeller having stern fins being able to be
installed on an oblique boat; wherein, said oblique boat having a
hull established along a horizontal line; at least one propelling
shaft being disposed on said hull, and said propelling shaft being
set with respect to said horizontal line by an included angle; said
all-speed-range propeller having stern fins further comprising: an
all-speed-range propeller disposed on said propelling shaft having
a plurality of blades; and a plurality of stern fins installed
surroundingly on said propelling shaft at intervals, between said
hull and said all-speed-range propeller.
2. The propeller as claimed in claim 1, wherein, said included
angle formed by said propelling shaft and said horizontal line is
between 6 degrees and 14 degrees.
3. The propeller as claimed in claim 1, wherein, a fin type of said
stern fins adopts a NACA 66 type.
4. The propeller device as claimed in claim 1, wherein, a height of
said stern fins is 0.5 to 1.5 times of a height of said blades of
said all-speed-range propeller.
5. The propeller as claimed in claim 1, wherein, a distance between
said stern fins and said all-speed-range propeller is 0.5 to 1.5
times of a radius of said blades of said all-speed-range
propeller.
6. The propeller as claimed in claim 1, wherein, 3 to 7 stern fins
are adopted.
7. The propeller as claimed in claim 1, wherein, a camber direction
of said stern fins is the same as a rotating direction of said
propelling shaft.
Description
1. FIELD OF THE INVENTION
[0001] The present invention relates to an all-speed-range
propeller having stern fins.
2. DESCRIPTION OF THE RELATED ART
[0002] Currently, the propellers of NACA series or KCA series are
only suited to the speed of the boat under 30 knots, and the
propellers of supercaviating series are only suited to the speed of
the boat above 30 knots. In order to conquer afore restrictions,
the inventor of the present invention disclosed "ADVANCED FOIL
DESIGN METHOD AND STRUCTURE FOR MULTI SPEEDS" of the Patent
Publication No. US 2011/0059663 A1, "METHOD OF AN ALL-SPEED
PROPELLER" of the Patent Publication NO. US 2012/0065942 A1, and
"MARINE PROPELLER APPLICABLE TO ALL SPEED RANGES" of a U.S. patent
application Ser. No. 13/324,589. These publications and application
discloses an all-speed-range propeller that contains the advantages
of the propeller of the supercaviating series when it is driven by
a high speed, and the performance of the propeller will not be
influenced when it is driven by a low speed. Thus, these propellers
are suited to all speed ranges.
[0003] However, although such all-speed-range propellers are
practical and popular in the market, the inventor finds out that
the propelling shaft of the all-speed-range propeller is an oblique
design. Herein, when the inflow angle of the all-speed-range
propeller is over 5 degrees, the operating efficiency of the
all-speed-range propeller is largely reduced. Accordingly, the
inventor of the present invention endeavors to improve the
all-speed-range propeller and bring out the present invention.
SUMMARY OF THE INVENTION
[0004] The object of the present invention is to provide an
all-speed-range propeller that is suited to an oblique propelling
shaft of an oblique boat, and concurrently keeping the efficiency
of the all-speed-range propeller.
[0005] The all-speed-range propeller having stern fins of the
present invention is able to be installed on an oblique boat.
Wherein, the oblique boat has a hull established along a horizontal
line. At least one propelling shaft is disposed on the hull, and
the propelling shaft is set with respect to the horizontal line by
an included angle. The all-speed-range propeller having stern fins
further comprises: an all-speed-range propeller is disposed on the
propelling shaft, and a plurality of stern fins are installed
surroundingly on the propelling shaft at intervals, between the
hull and the all-speed-range propeller.
[0006] Accordingly, the all-speed-range propeller of the present
invention is utilized on the oblique propelling shaft of the
oblique boat. The stern fins guide the water flow to the
all-speed-range propeller so as to conquer the uneven inflow caused
by the oblique propelling shaft. Thereby, the operating efficiency
of the all-speed-range propeller can be promoted, which preferably
amends the problems existing in the current all-speed-range
propeller.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a schematic view of the present invention;
[0008] FIG. 2 is a partially enlarged sided view of the present
invention;
[0009] FIG. 3 is a schematic view showing the operating
performances of the present invention; and
[0010] FIG. 4 is a schematic view showing the comparison of the
blades of the present invention while being driven.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0011] Referring to FIGS. 1 and 2, a schematic view of the present
invention and a partially enlarged sided view of the same are
provided. An all-speed-range propeller 100 is provided for being
installed on an oblique boat 200. Wherein, the oblique boat has a
hull established along a horizontal line L. At least one propelling
shaft 202 is disposed on the hull, and the propelling shaft 202 is
set with respect to the horizontal line L by an included angle
.theta.. The included angle .theta. formed by the propelling shaft
202 and the horizontal line L is between 6 degrees and 14 degrees.
The all-speed-range propeller 100 having stern fins comprises:
[0012] an all-speed-range propeller 10 disposed on the propelling
shaft 202 has a plurality of blades 11; the detailed structure of
the all-speed-range propeller 10 has been disclosed before, thus
hereby being omitted; and
[0013] a plurality of stern fins 20 installed surroundingly on the
propelling shaft 202 at intervals, between the hull 201 and the
all-speed-range propeller 10. Wherein, there are 3 to 7 stern fins
20 surroundingly established on the propelling shaft 202. The fin
type of the stern fins 20 adopts a NACA 66 type. A height of the
stern fins 20 is 0.5 to 1.5 times of a height of the blades 11 of
the all-speed-range propeller 10. A distance between the stern fins
20 and the all-speed-range propeller 10 is 0.5 to 1.5 times of a
radius of the blades 11 of the all-speed-range propeller 10. A
camber direction of the stern fins 20 is the same as a rotating
direction of the propelling shaft 202.
[0014] Referring to FIG. 3, a schematic view is showing the
operating performances of the present invention. When the
all-speed-range propeller 100 having stern fins is applied to the
oblique propelling shaft 202 of the oblique boat 200, the stern
fins 20 directly guide the water flow toward the all-speed-range
propeller 10 so as to conquer the uneven inflow caused by the
oblique propelling shaft 202. Namely, the disadvantage of an
overlarge inflow angle is amended, and the operating efficiency of
the all-speed-range propeller 10 is enhanced. Thus, the
all-speed-range propeller 10 is now suited to the oblique boat 200.
According to a practical test, when the speed of the boat is 40
knots and the included angle of the propelling shaft 202 and the
horizontal line L is 10 degrees, the operating efficiency of the
all-speed-range propeller 100 having stern fins can be enhanced 2
to 3%.
[0015] Further, referring to FIG. 4, a schematic view is showing
the comparison of the blades of the present invention while being
driven. According to a practical test, a static thrust of the
all-speed-range propeller 10 having stern fins is enhanced to 40
newton, and the amplitude of vibration of the propeller in time of
operating can be largely lessened. That is to say, the stern fins
20 not only promote the operating efficiency of the all-speed-range
propeller 10 but stabilize the thrusting force of the propeller.
Accordingly, the all-speed-range propeller 10 is not subject to
fatigue.
* * * * *