CN111792013A

CN111792013A - Conduit type high-efficiency propeller

Info

Publication number: CN111792013A
Application number: CN202010793761.2A
Authority: CN
Inventors: 滕世成
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2020-10-20

Abstract

The invention discloses a conduit type high-efficiency propeller which comprises a propeller hub, a plurality of blades uniformly fixed on the circumferential side of the propeller hub and a conduit sleeved outside the blades, wherein the blades are surrounded by a propeller root, a guide edge, a propeller tip and a following edge which are sequentially connected, the guide edge is a curve of which one end far away from the propeller root extends in a direction deviating from water flow, and the blades are arc-shaped curved surfaces which are adaptive to the guide edge and of which one end far away from the propeller root bends in the direction of water flow. The efficient propeller adopting the structure has the advantages that the curve guide edge is adopted, the water chopping resistance is smaller during forward rotation, the edge discharge is smoother by matching with the curved blade, the guide pipe realizes the bundling effect on the reverse thrust water body, the reverse thrust is more concentrated, the normal reverse thrust is larger, and the propulsion efficiency is improved.

Description

Conduit type high-efficiency propeller

Technical Field

The invention relates to a technology of a marine ducted propeller, in particular to a ducted high-efficiency propeller.

Background

The propeller is a device for converting the rotational power of an engine into a propulsive force by rotating blades in the air or water, mainly comprises two or more blades and a hub, and is widely used for propellers of airplanes and ships, and the like.

The guide edge and the trailing edge of the blade are basically in a straight line shape or a shape with a slightly equal curvature and a convex shape, and the blade is arranged symmetrically by taking the center line of the blade as an axis. When the structure is arranged to work, the guide edge water chopping and edge discharge are easy to generate random negative pressure turbulence, and because the linear velocity of the blade tip is larger, the stress deformation rebound amplitude is large, and in addition, the impact rebound of the centrifugal water flow on the guide pipe and the combined action of the centrifugal water flow and the negative pressure turbulence enable the blades to generate multi-harmonic vibration and generate noise, so that the stress on the blade surface is uneven, the thrust is weakened, and the propulsion efficiency of the propeller is reduced.

Disclosure of Invention

The invention aims to provide a conduit type high-efficiency propeller, which has the advantages that by adopting a curve guide edge, the water chopping resistance is smaller during forward rotation, and the edge discharge is smoother by matching with a curved blade; the set guide pipe realizes the bundling effect on the reverse thrust water body, so that the reverse thrust is more concentrated, the normal reverse thrust is larger, and the propulsion efficiency is improved.

In order to achieve the purpose, the invention provides a ducted high-efficiency propeller which comprises a propeller hub, a plurality of blades uniformly fixed on the circumferential side of the propeller hub and a duct sleeved outside the blades, wherein the blades are surrounded by a propeller root, a guide edge, a propeller tip and a following edge which are sequentially connected, the guide edge is a curve of which one end far away from the propeller root extends in a direction deviating from water flow, and the blades are arc-shaped curved surfaces which are adaptive to the guide edge and of which one end far away from the propeller root is bent towards the direction of the water flow so as to form gradual change forward water flow bulges.

Preferably, a plurality of said blades are arranged symmetrically about the hub centre.

Preferably, four blades are uniformly fixed on the circumferential side of the hub and are respectively positioned on four axes of a bisector of a cross, and an included angle between a connecting line between the midpoint of the blade and the central point of the bisector of the cross and the axes of the bisector of the cross is 15-30 degrees.

Preferably, the width of the blade middle is greater than the width of the blade tip.

Preferably, the plane of the blade tip protrudes out of the plane of the rear end of the hub, an included angle between a connecting line between the midpoint of the blade tip and the center of the hub and an axial vertical line is a caster angle, and the caster angle is 10-15 degrees.

The invention has the following beneficial effects:

1. by adopting the curve guide edge, the water chopping resistance is smaller when clockwise forward rotation is carried out;

2. the middle width of the paddle is larger than the width of the paddle tip, the traditional maximum stress of the paddle tip is changed into the maximum stress of the middle part of the paddle, so that the equivalent acting force of the propeller is transferred to the middle part of the paddle from the part close to the paddle tip, and the rebound vibration caused by the elastic deformation of the paddle due to the maximum stress of the paddle tip is effectively avoided;

3. the blade surface which is arched in the direction facing to the water flow is matched between the guide edge and the trailing edge, so that the trailing edge discharge is smoother; the arranged guide pipe realizes the bundling effect on the reverse thrust water body, so that the reverse thrust is more concentrated, the normal reverse thrust is larger, and the propulsion efficiency is improved;

4. the blades symmetrically arranged around the center of the propeller hub enable the motion track of the blades to be matched with the relative centrifugal motion trend of the reverse thrust water body, and the blade surface is uniformly and stably stressed.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a perspective view of a ducted high efficiency propeller according to an embodiment of the present invention;

FIG. 2 is a plan view of a ducted high efficiency propeller according to an embodiment of the present invention;

fig. 3 is a plan view of a conventional propeller.

Wherein: 1. a hub; 2. a paddle; 20. guiding edges; 21. following; 22. a paddle tip; 3. a conduit; 4. and (4) equally dividing the cross into lines.

Detailed Description

The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.

Fig. 1 is a perspective view of a ducted high-efficiency propeller according to an embodiment of the present invention, fig. 2 is a plan view of a ducted high-efficiency propeller according to an embodiment of the present invention, fig. 3 is a plan view of a conventional propeller, as shown in the drawings, the structure of the present invention includes a hub 1, a plurality of blades 2 uniformly fixed to a circumferential side of the hub 1, and a duct 3 sleeved outside the blades 2, the blades 2 are surrounded by a root, a leading edge 20, a blade tip 22, and a trailing edge 21 which are connected in sequence, the leading edge 20 is a curve extending away from a direction of water flow at one end away from the root, and the blades 2 are arc curved surfaces which are adapted to the leading edge 20 and are curved toward the direction of water flow at one end away from the root; the conduit 3 achieves water fluid concentration.

Preferably, a plurality of blades 2 are arranged symmetrically about hub 1. Four blades 2 are uniformly fixed on the circumferential side of the propeller hub 1, the four blades 2 are respectively positioned on four axes of the bisector 4, an included angle alpha between a connecting line between the midpoint A of the propeller tip 22 and the central point O of the bisector 4 and the axes of the bisector 4 is 15-30 degrees, the bisector 4 of the propeller is a symmetrical line of the traditional propeller, namely, compared with the equivalent center line of the blades of the traditional propeller, the equivalent center line of the blades of the traditional propeller is close to the following direction and extends in a bending mode, and the water drainage resistance is smaller.

Preferably, the width of the middle of the blade 2 is larger than the width of the blade tip 22, and the widest position of the blade 2 in this embodiment may also be set at 50% -60% of the radius of the blade 2.

Preferably, the plane of the blade tip 22 protrudes out of the plane of the rear end of the hub 1, the included angle between the connecting line between the midpoint of the blade tip 22 and the center of the hub 1 and the axial vertical line is a retroversion angle beta, and the angle of the retroversion angle beta is 10-15 degrees; the farthest end of the paddle 2 from the paddle root is a paddle tip 22, and the widest part of the paddle 2 protrudes to an arc-shaped curved surface consistent with the water flow direction, so that the water chopping resistance is further reduced.

Therefore, the guide pipe type efficient propeller adopting the structure has the advantages that the water chopping resistance is smaller during forward rotation by adopting the curve guide edge, the edge discharge is smoother by matching with the curved surface paddle, the guide pipe realizes the bundling effect on the reverse thrust water body, the reverse thrust is more concentrated, the normal reverse thrust is larger, and the propulsion efficiency is improved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a high-efficient screw of pipe formula, includes the propeller hub, evenly be fixed in a plurality of paddles and the cover of propeller hub circumferencial side are located the pipe outside the paddle, the paddle is enclosed by consecutive oar root, leading edge, oar tip and follow limit, its characterized in that: the guide edge is a curve extending in a direction away from the water flow at one end far away from the propeller root, and the paddle is an arc-shaped curved surface which is adaptive to the guide edge and is bent in a direction towards the water flow at one end far away from the propeller root.

2. The ducted high efficiency propeller of claim 1, wherein: a plurality of the blades are arranged symmetrically about the hub center.

3. A ducted high efficiency propeller as claimed in claim 2, wherein: four blades are uniformly fixed on the circumferential side of the propeller hub and are respectively positioned on four axes of a bisector of a cross, and an included angle between a connecting line between the midpoint of the propeller tip and the central point of the bisector of the cross and the axes of the bisector of the cross is 15-30 degrees.

4. The ducted high efficiency propeller of claim 1, wherein: the width of the middle part of the paddle is larger than the width of the tip of the paddle.

5. The ducted high efficiency propeller of claim 1, wherein: the plane of the oar tip protrudes out of the plane of the back end of the oar hub, the included angle between the connecting line between the center point of the oar tip and the center of the oar hub and the axial perpendicular line is a caster angle, and the caster angle is 10-15 degrees.