CN219884064U - Screw propeller - Google Patents

Abstract

A propeller comprises a hub and three blades, wherein each blade comprises a blade root, a blade tip, a leading edge and a trailing edge, and a point at which the leading edge of any blade intersects with the outer peripheral surface of the hub is marked as a tangent point in a projection view along the direction of a rotation axis; an included angle alpha is formed between a tangent line of the guide edge on the tangent point and a tangent line of the peripheral surface of the hub on the tangent point; the included angle alpha is 0-15 degrees; the three paddles are not overlapped with each other. The gaps between the propellers can be used for passing sundries in water supply, so that contact and winding between the sundries and the propellers are avoided; and sundries wound on the propeller and the propeller hub can also move out of the propeller along the guide edge, so that the winding phenomenon is further reduced.

Description

Screw propeller

Technical Field

The utility model relates to the field of ship accessories, in particular to a propeller.

Background

The propeller means a device for converting the rotational power of an engine into propulsive force by rotating blades in air or water, and may have two or more blades connected to a hub, the backward face of the blades being a helicoid or a propeller similar to the helicoid. Propellers are widely used, such as propellers of airplanes and ships.

Chinese patent discloses a marine propeller (issued publication number: CN 103723260B), including a hub and blades uniformly distributed along the circumference of the hub, characterized in that: the hub is a waist drum-shaped hub with a shaft hole in the center; the blade surface profile of the blade is surrounded by a hyperbolic convex guide edge, a hyperbolic concave trailing edge and a circumferential arc edge, the blade surface of the blade is gradually increased from 0.2 to 0.8 times of the radius of the propeller, the arc chord length is gradually increased to 0.8 times and reaches the maximum value, and the arc chord length is slightly reduced from 0.8 to 1.0 times; the cross-sectional shape of the blade is: the cross section of the blade is circular from 0.2 to 1.0 times of the radius of the propeller, and the cross section of the blade is elliptical with the short axis gradually reduced; the pitch angle alpha of the blade is 10-25 degrees.

The Chinese patent also discloses a cutting device (publication No. CN 106516060A) for preventing propeller winding, comprising a propeller, a transmission shaft and a ship stern tube, wherein one end of the transmission shaft extends into the ship stern tube, the other end of the transmission shaft extends out of the ship stern tube and is connected with the propeller, the cutting device is characterized in that a cylindrical sheath is arranged around the hub of the propeller, the length of the cylindrical sheath is longer than that of the transmission shaft extending out of the ship stern tube, the diameter of the cylindrical sheath is longer than that of the ship stern tube, the cylindrical sheath wraps the cylindrical sheath on the edge of the ship stern tube, a cutter bracket is arranged on the lateral wall of the outer side of the ship stern tube, one end of the cutter bracket is connected with the lateral wall of the ship stern tube, the other end of the cutter bracket is provided with a cutter vertical to the cutter bracket, one end of the cutter is connected with the cutter bracket, the other end of the cutter is in conflict with the hub of the cutter of the propeller, the two sides of the cutter are respectively provided with blades, the width of the cutter is longer than that of the cylindrical sheath, the upper surface of the cylindrical sheath is provided with a cutting strip, the lower end of the cutting strip is connected with the upper end, and the upper end is provided with a cutting edge which is wound on the blade, and sundries are prevented.

In summary, the propeller in the prior art has no solution to the winding problem, when the propeller blade is used, the propeller blade is easy to wind with objects such as aquatic plants, the impeller is damaged when the propeller blade is light, and the rotating resistance of the propeller blade is increased when the propeller blade is heavy, so that the motor is burnt; or by additionally mounting a cutting device on the drive shaft to cut off the sundries wound on the propeller, which requires frequent replacement of worn blades, on the one hand, increasing production costs and, on the other hand, the cutting device itself also has the risk of winding.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a propeller, wherein a cutting device is not additionally arranged on the propeller, so that the cost is reduced, sundries in water are more easily separated after being wound on the propeller, or the sundries are not easily contacted when the sundries are not wound, and the winding phenomenon is reduced.

The utility model adopts the technical scheme that:

a propeller comprises a hub and three blades, wherein the blades comprise a blade root, a blade tip, a leading edge and a trailing edge, and in a projection view along the direction of a rotation axis,

a point at which the leading edge of any blade intersects the outer circumferential surface of the hub is marked as a tangent point;

an included angle alpha is formed between a tangent line of the guide edge on the tangent point and a tangent line of the peripheral surface of the hub on the tangent point;

the included angle alpha is 0-15 degrees;

the three paddles are not overlapped with each other.

Preferably, the included angle α is 0 °, that is, the tangent line of the guiding edge at the tangent point coincides with the tangent line of the peripheral surface of the hub at the tangent point, that is, the guiding edge is tangent to the hub.

According to an embodiment of the present utility model, in a projection view in the direction of the rotation axis,

the arc length of the blade root of the blade is a;

the circumference of the outer circumferential surface of the hub is b;

the arc length a and the perimeter b satisfy the relation: b=3a.

According to an embodiment of the utility model, the distance of the blade tip of the blade to the axis of rotation is the radius R of the propeller;

the distance from the peripheral surface of the hub to the rotation axis is the radius r of the hub;

the ratio between the radius R of the propeller and the radius R of the hub is as follows: r/r=0.2-0.5.

Preferably, R/r=0.3.

According to the embodiment of the utility model, the blade is of a bent structure, and the blade comprises a bending line;

from the blade root to the bending line, the blade inclines towards the back side of the ship; from the bend line to the blade tip, the blade is inclined to the front side of the vessel.

According to an embodiment of the utility model, the bend line is 0.7-0.9R from the axis of rotation.

Preferably, the bend line is spaced from the axis of rotation by a distance of 0.8R.

According to the embodiment of the utility model, the chord length of the blade is gradually increased from the blade root to the bending line; gradually decreasing from the bend line to the blade tip.

According to the embodiment of the utility model, the paddle hub is internally connected with a paddle seat, and the paddle seat is internally provided with a shaft hole;

the hub is connected with an output shaft of the motor through a shaft hole.

According to the embodiment of the utility model, a key groove is arranged in the shaft hole, and the shaft hole is connected with an output shaft key of the motor through the key groove.

According to the embodiment of the utility model, when the propeller rotates, the axes of the output shaft, the propeller seat and the propeller hub are all coincident with the rotation axis.

According to the embodiment of the utility model, the propeller is integrally formed by adopting an aluminum alloy pressure casting process.

In the production, sales and transportation process of the propeller, the projection of the blades on the circumferential surface of the propeller hub falls in the range of the propeller hub. That is, the whole blade does not exceed the length range of the hub, and the blade structure is prevented from being damaged in the packaging and transportation processes.

In the present utility model, some lines or faces referred to are general descriptive terms in the art, and specific definitions refer to the following:

when the propeller is rotating, one side of the blade which is contacted with water is called a leading edge, and the other side is called a trailing edge.

The end of the propeller blade that is close to the hub is called the blade root and the other end is called the blade tip.

The chord length of the propeller is the width of the blade, namely the distance from the leading edge to the trailing edge of the blade with a certain radius.

The utility model has the beneficial effects that:

when the propeller is in a static state, sundries in a water body such as water grass or fishing net can directly pass through gaps among the blades, so that contact entanglement between the propeller and the blades is prevented, and the occurrence of the entanglement phenomenon is reduced.

The included angle between the leading edge and the peripheral surface of the propeller hub is set to be as small as possible, and even the leading edge is tangent to the propeller hub, so that when sundries such as water grass or fishing net are wound on the propeller hub, the wound water grass or fishing net can move to the outside of the blade along the leading edge, and further the winding phenomenon is prevented.

The screw propeller can reduce the occurrence of winding phenomenon without using an additional cutting device, thereby simplifying the structure of the screw propeller and reducing the production cost.

Drawings

The utility model will be described in further detail below in connection with the drawings and the preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the utility model. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.

FIG. 1 is a perspective view of a propeller provided by an embodiment of the present utility model in the direction of the axis of rotation and from the rear of the boat toward the front of the boat;

FIG. 2 is a side view of a propeller provided by an embodiment of the present utility model;

FIG. 3 is a schematic view of the structure of the propeller from the rear of the ship toward the front of the ship according to the embodiment of the present utility model;

FIG. 4 is a schematic view of the structure of the propeller from the front of the ship to the rear of the ship according to the embodiment of the present utility model;

fig. 5 is a cross-sectional view of the propeller of fig. 1 taken along the A-A direction.

In the figure: 1. a paddle; 11. a leaf tip; 12. blade root; 13. edge guiding; 14. carrying out edge following; 2. a hub; 3. tangent points; 4. an axis of rotation; 5. a bending line; 6. a paddle seat; 61. a coupling; 62. a connecting rib; 63. a shaft hole; 64. a keyway.

Detailed Description

In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be described in detail, clearly and completely with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.

Example 1

Referring to fig. 1-5, the present embodiment provides a propeller.

The propeller comprises a hub 2 and blades 1, wherein the blades 1 can be arranged into 2-9 pieces, and the blades 1 are arranged on the peripheral surface of the hub 2.

Preferably, three blades 1 are equally spaced and symmetrically distributed on the outer circumferential surface of the hub 2.

The blade 1 comprises a blade root 12, a blade tip 11, a leading edge 13 and a trailing edge 14. Wherein, one end of the blade 1 close to the hub 2 and connected with the hub 2 is called a blade root 12, the other end of the blade 1 far away from the hub 2 is called a blade tip 11, and when the propeller is rotating, one side of the blade 1 which is firstly contacted with water and is scratched is called a leading edge 13, and the other side opposite to the leading edge 13 is called a trailing edge 14.

As shown in fig. 1, a point at which the leading edge 13 of any one blade 1 intersects the outer circumferential surface of the hub 2 is defined as a tangential point 3; on the blade 1, a tangent line of the guide edge 13 on the tangent point 3 is defined as a tangent line L, a tangent line of the outer peripheral surface of the hub 2 on the tangent point 3 is defined as a tangent line L ', the tangent line L and the tangent line L' are intersected, and the intersection point is the tangent point 3; further, an acute angle formed by the intersection between L and L' is defined as an included angle α, and the included angle α is in the range of 0 ° to 15 °. Preferably, the included angle α is 0 °, and the guiding edge 13 is exactly tangential to the outer circumferential surface of the hub 2, and the L and L' overlap.

The projections of the three blades 1 on fig. 1 do not overlap each other. Preferably, in the projection view shown in fig. 1, the projection of the blade root of any blade 1 on the front view is a circular arc of one third of a circle, the center of the circular arc coincides with the rotation axis, the projection of the blade root of the blade 1 on the front view is an arc length a, the perimeter of the outer peripheral surface of the hub 2 is b, and the arc length a and the perimeter b satisfy the relation: b=3a. On two adjacent blades 1, the tangential point 3 at which the leading edge 13 of one blade intersects the hub 2 coincides with the intersection point of the trailing edge 14 of the other blade with the hub 2.

The distance from the top of the blade tip 11 of the blade 1 to the rotation axis 4 is the radius of the propeller, and the radius length of the propeller is defined as R; the distance from the outer peripheral surface of the hub 2 to the rotation axis 4 is the radius of the hub 2, the radius length of the hub 2 is defined as R, and the ratio relation between the radius R of the propeller and the radius R of the hub 2 is satisfied: r/r=0.2-0.5. Preferably, in the present embodiment, the relationship between the radius R of the hub 2 and the radius R of the propeller is satisfied: r=0.3r. The screw propeller is applied to a boat for river or lake, the rotating speed working range of the screw propeller is 100-3000 revolutions, and the screw propeller is driven by a motor, and the hub diameter ratio (the diameter of a hub 2/the diameter of the screw propeller) between R and R can enable the screw propeller to have higher strength so as to adapt to the high-speed rotating environment.

In the present utility model, the embodiment of the propeller specifically given is a left-hand (counterclockwise rotation as viewed from the rear of the ship to the front of the ship), but the specific structure is equally applicable to a right-hand propeller.

When the propeller is in a static state, aquatic weeds or fishing nets and the like in the water body can directly pass through gaps among the blades 1, so that entanglement between the aquatic weeds or the fishing nets and the blades 1 is prevented, and the occurrence of the entanglement phenomenon is reduced.

The design of non-overlapping between the paddles 1 can enlarge the gap between the paddles 1, and when waterweed or fishing net is mixed between the paddles 1, the waterweed or fishing net is not easy to be clamped in the gap between the adjacent paddles 1.

The included angle between the leading edge 13 and the peripheral surface of the propeller hub 2 is set to be as small as possible, even the leading edge 13 is tangent to the propeller hub 2, so that when the aquatic weed or the fishing net is wound on the propeller hub 2, the wound aquatic weed or the fishing net can move to the outside of the blade 1 along the leading edge 13, and further the winding phenomenon is prevented.

Example two

Referring to fig. 1-5, the present embodiment provides another embodiment based on the above embodiment.

The blade 1 is provided with a forward-tilted bending structure, as shown in fig. 2 and 5, and the blade 1 comprises a bending line 5; from the blade root 12 to the bending line 5, the blade 1 is inclined to the rear side of the vessel; the purpose is to increase the clearance between the blade 1 and the hull so as to reduce the hull vibration induced by the excitation of the propeller. From the bending line 5 to the blade tip 11, the blade 1 is inclined to the front side of the vessel; the distance from the blade tip 11 to the axis of rotation 4 is the radius R of the propeller, and the distance from the bend line 5 to the axis of rotation 4 is 0.7-0.9R. Preferably, the distance from the bending line 5 to the rotation axis 4 is 0.8R. The bending structure is arranged, so that the diameter of the actual action of the propeller is effectively increased. The larger the propeller diameter, the lower the rotational speed, the higher the efficiency, but the propeller diameter can only be limited to a certain maximum diameter due to the limited water depth of the running channel and the design draft of the ship. The blade 1 of the utility model adopts a structure of bending towards the forward warping of the ship at the position close to the tip of the blade, thereby increasing the actual acting diameter thereof.

The diameter of the structure of the blade 1 is 1.06-1.2 times of that of the common blade 1, thereby improving the efficiency. The rear side of the propeller ship is a pressure surface, and the front side of the ship is a suction surface. The blade 1 in the utility model bends forward near the blade tip 11, increasing the pressure difference at the tip, thereby improving the lift of the propeller. The rotor efficiency can be improved by 3% -6% compared to conventional rotor designs and the vortexes generated at the blade tip 11 are reduced.

Further, as shown in fig. 1, the leading edge 13 and the trailing edge 14 of the blade 1 are hyperbolas protruding to the outside of the blade 1, and the chord length of the blade 1 gradually increases from the root to the position of the bending line 5, and when the chord length reaches the longest value at the bending line 5, then gradually decreases from the bending line 5 to the blade tip 11, and when the chord length reaches the minimum value at the blade tip 11, the chord length is equal to zero.

Further, as shown in fig. 2, in a side view of the propeller, a pitch angle β is formed between the blade root of the blade 1 and the outer circumferential surface of the hub 2, and the pitch angle β is set to be 45 ° -60 °. Preferably, the pitch angle β is set at 45 °, at which the angle of attack of the propeller upon contact with water is also equal to 45 °, the propeller being capable of good lift and thrust.

Further, as shown in fig. 2 or fig. 5, in the side view of the propeller, the orthographic projection of the blade 1 on the outer peripheral surface of the hub 2 falls within the range of the hub 2; that is, the whole blade 1 does not exceed the length range of the hub, and the structure of the blade 1 is prevented from being damaged in the packaging and transporting processes.

The rest of the present embodiment is the same as in the above embodiment.

Example III

Referring to fig. 1-5, the present embodiment provides another embodiment based on the above embodiment.

The rotor hub 2 is provided with a hollow inner cavity, the opening direction of the inner cavity is along the direction of the rotation axis 4 and penetrates through the rotor hub 2, a rotor seat 6 is arranged in the hollow inner cavity, a shaft hole 63 is formed in the middle of the rotor seat 6, the shaft hole 63 is a through hole, the axis of the shaft hole 63 coincides with the rotation axis 4, and the shaft hole 63 is used for being connected with an output shaft of a motor. Preferably, the paddle seat 6 includes a shaft 61 and three connecting ribs 62 disposed on an outer peripheral surface of the shaft 61, the three connecting ribs 62 are disposed on the outer peripheral surface of the shaft 61 at equal intervals and symmetrically, one end of each connecting rib 62 is connected with the outer peripheral surface of the shaft 61, the other end of each connecting rib 62 is connected with an inner peripheral surface of the hub 2, and the shaft hole 63 is formed in the middle of the shaft 61. The paddle seat 6 is fixed in the inner cavity of the paddle hub 2 through the connecting ribs 62, and the connecting shaft 61 is arranged on one side of the paddle seat 6, which is closer to the ship or the motor.

The shaft hole 63 is internally provided with a key groove 64, and the shaft hole 63 is connected with the output end of the motor through the key groove 64. Preferably, the key connection is spline connection or flat key connection.

The output shaft of the motor, the paddle seat 6, the shaft hole 63 and the axis of the paddle hub 2 are all coincident with the rotation axis when rotating, so that the stability and the safety of the whole propeller are ensured when rotating.

The rest of the present embodiment is the same as in the above embodiment.

Example IV

Referring to fig. 1-5, the present embodiment provides another embodiment based on the above embodiment.

The screw propeller is formed by adopting aluminum alloy pressure casting so as to meet the requirement of demolding and facilitate mass production.

The rest of the present embodiment is the same as in the above embodiment.

The foregoing has outlined rather broadly the more detailed description of the utility model in order that the detailed description of the utility model that follows may be better understood, and in order that the present utility model may be better understood. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (10)

1. Propeller comprising a hub (2) and three blades (1), the blades (1) comprising a blade root (12), a blade tip (11), a leading edge (13) and a trailing edge (14), characterized in that, in a projection view in the direction of the axis of rotation (4),

a point at which the leading edge (13) of any blade (1) intersects the outer circumferential surface of the hub (2) is marked as a tangent point (3);

an included angle alpha is formed between a tangent line of the guide edge (13) at the tangent point (3) and a tangent line of the peripheral surface of the hub (2) at the tangent point (3);

the included angle alpha is 0-15 degrees;

the three paddles (1) are not overlapped with each other.

2. The propeller of claim 1, wherein the propeller is configured to rotate,

on a projection view in the direction of the rotation axis (4),

the arc length of the blade root of the blade (1) is a;

the circumference of the outer circumferential surface of the hub (2) is b;

the arc length a and the perimeter b satisfy the relation: b=3a.

3. The propeller of claim 1, wherein the propeller is configured to rotate,

the distance from the blade tip (11) of the blade (1) to the rotation axis (4) is the radius R of the propeller;

the distance from the outer peripheral surface of the hub (2) to the rotation axis (4) is the radius r of the hub (2);

the ratio between the radius R of the propeller and the radius R of the hub (2) is as follows: r/r=0.2-0.5.

4. A propeller according to claim 3, wherein the blade (1) is of curved construction, the blade (1) comprising a curved line (5);

from the blade root (12) to the bending line (5), the blade (1) is inclined to the rear side of the ship; from the bending line (5) to the blade tip (11), the blade (1) is inclined to the front side of the vessel.

5. Propeller according to claim 4, wherein the bending line (5) is 0.7-0.9R from the rotation axis (4).

6. A propeller according to claim 5, wherein the chord length of the blade (1) increases gradually from the root to the bend line (5) and decreases gradually from the bend line (5) to the blade tip (11).

7. Propeller according to claim 1, wherein the hub (2) is connected with a hub (6), and wherein the hub (6) is provided with a shaft hole (63);

the hub (2) is connected with an output shaft of the motor through a shaft hole (63).

8. The propeller according to claim 7, wherein a key groove (64) is provided in the shaft hole (63), and the shaft hole (63) is keyed to the output shaft of the motor via the key groove (64).

9. Propeller according to claim 8, wherein the shaft centers of the output shaft, the hub (6) and the hub (2) coincide with the rotation axis (4) when the propeller rotates.

10. The propeller according to any one of claims 1-9, wherein the propeller is integrally formed using an aluminum alloy die casting process.