CN218986927U

CN218986927U - Rifling type honeycomb duct for ship propeller

Info

Publication number: CN218986927U
Application number: CN202223266948.0U
Authority: CN
Inventors: 冯振川
Original assignee: Jiangsu Xinhang Ship Technology Co ltd
Current assignee: Jiangsu Xinhang Ship Technology Co ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-05-09
Anticipated expiration: 2032-12-06

Abstract

The utility model discloses a rifling type flow guide pipe for a ship propeller, which comprises a hub, blades and a flow guide pipe, wherein the hub, the blades and the flow guide pipe are coaxially arranged; an incoming flow pre-rotation structure is arranged at the inlet end of the flow guide pipe and used for rectifying and deflecting forward incoming flow, so that water flow is cut by the blades at a certain deflection angle, the deflection angle of the water flow corresponds to the pitch angle of the blades, and the blades cut the water flow and push the water flow backwards; the utility model can rectify and pre-rotate the incoming flow, increase the rotation speed of the blades relative to the water flow, increase the hydrodynamic pitch angle of the blades, and effectively improve the propulsion efficiency.

Description

Rifling type honeycomb duct for ship propeller

Technical Field

The utility model belongs to the technical field of ship propellers, and particularly relates to a rifling type honeycomb duct for a ship propeller.

Background

The conduit propeller is a propeller assembly formed by the propeller and a conduit. The guide pipe is a circular sleeve arranged at the periphery of the propeller, compared with the common propeller, the guide pipe can ensure that directional water flow is supplied to the propeller, plays a role in equalizing and accompanying flow, can inhibit pitching of the ship, plays a role in damping, and improves the stability of the ship sailing in stormy waves; the guide pipe is surrounded outside the propeller to play a role in protection, the propeller is not easy to be exposed out of the water surface to generate a suction phenomenon, and foreign objects can be prevented from being damaged or a net twisting accident can be avoided. However, the existing conduit propeller only has the functions of rectifying and accelerating incoming flow, the lifting range of the propulsion efficiency of the propeller is limited, and the dead weight of the fixed conduit is large, so that the overall weight of the ship is increased, the gyratory performance and the low-speed rudder effect of the ship are poor, and the operability is affected.

Disclosure of Invention

Aiming at the problems and the technical requirements, the utility model provides the rifling type flow guide pipe for the ship propeller, which can rectify and pre-rotate the incoming flow, increase the rotation speed of the blades relative to the water flow, increase the hydrodynamic pitch angle of the blades and effectively improve the propulsion efficiency.

The technical scheme of the utility model is as follows: the rifling type flow guide pipe for the ship propeller comprises a hub, blades and a flow guide pipe which are coaxially arranged, wherein a circle of blades are arranged on the outer ring of the hub, and the flow guide pipe is fixedly arranged on the periphery of the blades; the inlet end of the flow guide pipe is provided with an incoming flow pre-rotation structure, the incoming flow pre-rotation structure rectifies and deflects the incoming flow in front, so that water flow is cut by the blades at a certain deflection angle, the deflection angle of the water flow corresponds to the pitch angle of the blades, and the blades cut the water flow and push the water flow backwards. The water flow enters the blade at a certain deflection angle, the blade has a pitch angle, the deflection angle corresponds to the pitch angle, the energy loss caused by the direct impact of the water flow on the blade can be avoided, the pitch of the blade is increased, and the improvement of the propulsion efficiency is realized.

Furthermore, the incoming flow pre-rotation structure is a circle of inclined line type boring grooves arranged on the inner wall of the inlet end of the flow guide pipe, deflection angles between each boring groove and the axis are consistent, the bottoms of the boring grooves recessed into the inner wall are straight planes, and opposite side walls of the boring grooves are flat elliptic arc shapes. The water flow flows in from the front end opening of the guide pipe, and the water flow can generate corresponding gradient change through the inclined boring groove due to the existence of the boring groove, so as to achieve the effect of pre-rotation.

Further, the 0.7R radius of the blade is the maximum chord length of the blade, the pitch angle range is 18-28 degrees, and the deflection angle of each boring groove relative to the rotating shaft is 18-28 degrees. The pitch angle of the blade is defined as the angle between the pitch line of the blade at a certain radius and the plane perpendicular to the axis, also called the angle of attack, so that the water flow is pre-screwed to be consistent with the angle of attack, the water flow can avoid the impact on the upstream surface of the blade, directly enters the rear of the blade along the upstream surface, the rotational energy loss of wake flow after the blade is reduced, the pitch of the blade is increased, and the propulsion efficiency is also increased.

And because the pitch of each position in the radius range of the blade is different, the position with the maximum chord length of 0.7R is selected, the pitch of the position is also the position with the maximum pitch of the blade, and the inclination of the boring groove is kept in a corresponding relation with the position, so that the flux of cutting water flow of the blade is maximum.

Further, the highest position of the middle part of the side wall of the boring groove is 5mm, and the heights of the two ends of the side wall are 0mm.

Further, the length range of the boring groove extends from the front end of the flow guide pipe to 100mm in front of the blade. The distance of 100mm is reserved, so that a stable deflection angle is formed when the water flow reaches the blade surface of the paddle.

Further, the width of the boring groove is 10 mm-15 mm, and the distance between two adjacent boring grooves is 15mm.

Furthermore, the outer peripheral surface of the flow guide pipe is of a conical structure, and the diameter of the front port of the flow guide pipe is larger than that of the rear port of the flow guide pipe. The conical tube structure is convenient for collecting water flow, so that water flow aggregation is more stable.

Further, the material of the honeycomb duct is marine steel. The marine steel is usually high-quality carbon steel and high-quality low-alloy steel, and has certain strength, toughness, low temperature resistance, corrosion resistance and good welding performance.

Compared with the prior art, the utility model has the beneficial effects that: when the incoming flow in front of the propeller flows through the guide pipe, the water flow generates pre-rotation flow opposite to the rotation direction of the blade due to the guiding effect of a circle of boring grooves, and under the condition that the spiral angle of the blade is unchanged, the flux of the water flow in one rotation period is increased, the flow of the blade rotation cutting is also increased, and the effect of increasing the hydrodynamic pitch of the blade is achieved; the pre-rotation flow opposite to the rotation direction of the blade weakens the rotation speed of the wake flow after the blade, reduces the rotation capacity loss of the wake flow after the blade, and improves the propulsion efficiency under the combined action of increasing the relative rotation speed of the blade and reducing the energy loss of the wake flow after the blade; under the condition that other conditions are unchanged, the propeller propulsion efficiency of processing boring grooves on the guide pipe is increased by more than 1.5%, and meanwhile, the quality of the guide pipe is reduced by more than 4%.

Drawings

FIG. 1 is a block diagram of a draft tube and a paddle according to the present utility model;

FIG. 2 is a block diagram of a draft tube according to the present utility model;

FIG. 3 is a partial bore groove block diagram of the present utility model;

FIG. 4 is a block diagram of a hub and blade according to the present utility model;

FIG. 5 is a schematic flow diagram of the water flow with the blade after being pre-spun;

marked in the figure as: hub 1, paddle 2, upstream surface 21, leading edge 22, trailing edge 23, flow guiding pipe 3, boring groove 4, boring groove bottom 41, boring groove side wall 42.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

1-5 show a rifling type flow guide pipe for a ship propeller, which comprises a hub 1, blades 2 and a flow guide pipe 3 which are coaxially arranged, wherein a circle of blades 2 are arranged on the outer ring of the hub 1, and the flow guide pipe 3 is fixedly arranged on the periphery of the blades 2; the surface of the blade 2 contacted with the incoming flow is an upstream surface 21, and water flow enters the upstream surface 21 from a leading edge 22 of the blade 2, leaves the upstream surface from a trailing edge 23 of the blade 2, and enters the rear side of the blade 2.

The material of honeycomb duct 3 is marine steel, and honeycomb duct 3 outer peripheral face is the toper structure, and the front port diameter of honeycomb duct 3 is greater than back port diameter, and the water flow is collected to the conical tube structure of being convenient for, makes the water flow gathering more stable.

An incoming flow pre-rotation structure is arranged at the inlet end of the flow guide pipe 3 and used for rectifying and deflecting forward incoming flow, so that water flow is cut by the blades 2 at a certain deflection angle, the deflection angle of the water flow corresponds to the pitch angle of the blades 2, and the blades 2 cut the water flow and push the water flow backwards; specifically, the incoming flow pre-rotation structure is a circle of inclined boring grooves 4 arranged on the inner wall of the inlet end of the flow guide pipe, deflection angles between each boring groove 4 and the axis are consistent, the boring groove bottom 41 recessed into the inner wall is a straight plane, and opposite side walls 42 of the boring groove are flat elliptic arc shapes.

The pitch angle of the blade 2 is defined as the angle between the pitch line of the blade at a certain radius and the plane perpendicular to the axis, also called the attack angle, so that the water flow is pre-screwed to be consistent with the pitch angle, the water flow can avoid the impact on the upstream surface 21 of the blade, directly enters the rear of the blade along the upstream surface 21, the rotational energy loss of wake flow after the blade is reduced, the pitch of the blade 2 is increased, and the propulsion efficiency is also increased. And because the pitch of each position in the radius range of the blade 2 is different, the position with the maximum chord length of 0.7R is selected, the pitch of the position is also the position with the maximum pitch of the blade 2, and the inclination of the boring groove 4 keeps a corresponding relation with the position, so that the flux of the blade 2 for cutting water flow reaches the maximum. Thus, in a preferred embodiment, the 0.7R radius of the blade 2 is at the maximum chord length of the blade 2, where the pitch angle is in the range of 18 to 28, and the deflection angle of each slot 4 relative to the axis of rotation is also in the range of 18 to 28.

The highest position of the middle part of the side wall 42 of the boring groove is 5mm, and the heights of the two ends of the side wall 42 are 0mm; the length of the boring groove 4 extends from the front end of the flow guide pipe 3 to 100mm in front of the blade. A distance of 100mm is reserved, so that a stable deflection angle is formed when water flow reaches the blade surfaces of the paddles; the width of the boring groove 4 is 10 mm-15 mm, and the distance between two adjacent boring grooves 4 is 15mm.

The operation process of the utility model comprises the following steps: the incoming flow flows in from the front port of the flow guide pipe 3, is deflected by 18-28 degrees under the flow guide effect of a circle of boring grooves 4, forms vortex opposite to the rotation direction of the propeller blades 2, and the deflected water flow enters the upstream surface 21 from the leading edge 22 of the propeller blades 2 and slides out from the trailing edge backwards parallel to the upstream surface 21 to form a propeller rear wake, so that the flux of the propeller blades 2 for cutting the incoming flow is increased in unit time, the rotation energy loss of the propeller rear wake is reduced, and the integral propulsion efficiency of the propeller is improved.

While the utility model has been described with respect to several preferred embodiments, the scope of the utility model is not limited thereto, and any changes and substitutions that would be apparent to one skilled in the art within the scope of the utility model are intended to be included within the scope of the utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A rifling formula honeycomb duct for boats and ships screw, its characterized in that: the device comprises a paddle hub, paddles and a flow guide pipe which are coaxially arranged, wherein a circle of paddles are arranged on the outer ring of the paddle hub, and the flow guide pipe is fixedly arranged on the periphery of the paddles; the inlet end of the flow guide pipe is provided with an incoming flow pre-rotation structure, the incoming flow pre-rotation structure rectifies and deflects the incoming flow in front, so that water flow is cut by the blades at a certain deflection angle, the deflection angle of the water flow corresponds to the pitch angle of the blades, and the blades cut the water flow and push the water flow backwards.

2. The rifling draft tube for a marine propeller as set forth in claim 1, wherein: the incoming flow pre-rotation structure is a circle of inclined line type boring grooves arranged on the inner wall of the inlet end of the flow guide pipe, deflection angles between each boring groove and the axis are consistent, the bottoms of the boring grooves recessed into the inner wall are straight planes, and opposite side walls of the boring grooves are flat elliptic arc shapes.

3. The rifling draft tube for a marine propeller as set forth in claim 2, wherein: the 0.7R radius of the blade is the maximum chord length of the blade, the pitch angle range is 18-28 degrees, and the deflection angle of each boring groove relative to the rotating shaft is 18-28 degrees.

4. The rifling draft tube for a marine propeller as set forth in claim 2, wherein: the highest position of the middle part of the side wall of the boring groove is 5mm, and the heights of the two ends of the side wall are 0mm.

5. The rifling draft tube for a marine propeller as set forth in claim 2, wherein: the length range of the boring groove extends from the front end of the flow guide pipe to 100mm in front of the blade.

6. The rifling draft tube for a marine propeller as set forth in claim 2, wherein: the width of the boring groove is 10 mm-15 mm, and the distance between two adjacent boring grooves is 15mm.

7. The rifling draft tube for a marine propeller as set forth in claim 2, wherein: the periphery of the flow guide pipe is of a conical structure, and the diameter of the front port of the flow guide pipe is larger than that of the rear port of the flow guide pipe.

8. The rifling draft tube for a marine propeller as set forth in claim 2, wherein: the honeycomb duct is made of marine steel.