CN2219856Y

CN2219856Y - Marine propeller

Info

Publication number: CN2219856Y
Application number: CN 95233589
Authority: CN
Inventors: 谢心达
Original assignee: Penglai City No2 Shipyard
Current assignee: Penglai City No2 Shipyard
Priority date: 1995-04-06
Filing date: 1995-04-06
Publication date: 1996-02-14
Anticipated expiration: 2005-04-06

Abstract

The utility model discloses a marine propeller which is composed of a propeller blade 2 and a propeller hub 1, wherein the propeller blade 2 is in a B shape. The marine propeller is characterized in that the propeller blade 2 is a blade of which the thread pitch is gradually increased from the blade root to the blade tip. The marine propeller can absorb the power generated by a main machine more efficiently, increases the propulsion efficiency, enhances the sailing speed of a ship, etc. The test operated by the relevant departments shows that compared with the existing B-shaped propeller, the efficiency of the utility model is increased by more than 10%. The marine propeller is especially suitable for small and medium high-speed ships.

Description

A kind of marine propeller

The utility model relates to a kind of marine propeller, particularly is the marine propeller of Type B about blade.

According to theoretical calculate and practical experience, people design polytype marine propeller, as: Type B, BB type, AU type, MAU type etc.Different types of boats and ships require to use dissimilar screw propellers, and it also is different that dissimilar screw propeller design requires.To high-speed ship, the Type B screw propeller is used wider.The Type B propeller blade is Type B, and its pitch adopts constant pitch mostly; (R is to propeller hub centreline space vertical distance from blade tip) is variable pitch from blade root to 0.5R in the fraction employing, is constant pitch from 0.6R to blade tip.Above-mentioned Type B screw propeller existing problems and weak point are: because, the wake speed field is different to each radius of screw propeller, thereby to the main frame absorbed power is different, so blade adopts constant pitch or part constant pitch, just can not more effective absorption main frame send power, thereby just make propulsion coefficient and the speed of a ship or plane lower etc.

The purpose of this utility model is to provide a kind of can more effectively absorb the main frame developed power, increases propulsion coefficient, and the improved blade that improves ship speed is the Type B marine propeller.

The purpose of this utility model can reach by following measure: known blade is that the Type B marine propeller is made of blade 2 and propeller hub 1, and paddle 2 is Type B, and improvements of the present utility model are: the blade that blade 2 increases from blade root to blade tip gradually for pitch.

Can also reach by following measure: blade 2 is given birth to the blade that increases for pitch from blade root to the blade tip line.

The utility model has screw propeller to compare with existing Type B ship and has following advantage and actual effect: according to fluid mechanics principle, wake produces the flow velocity difference in each radius of screw propeller, and to blade tip, being linear basically increases from the blade blade root.Blade of the present utility model 2 increases from blade root to blade tip gradually for pitch, or be pitch from blade root to blade tip linear increasing.Blade 2 pitch from blade root to blade tip gather way with wake gather way to blade tip from blade 2 blade roots mutually suitable.The pitch of blade 2 increases gradually from blade root to blade tip, and propeller wake also increases gradually from blade root to blade tip.Thereby screw propeller absorbs main engine power to be increased, and propulsion coefficient increases, ship speed raising etc.Through relevant department's test shows: the utility model is raised the efficiency more than 10% than existing Type B screw propeller.

Accompanying drawing and drawing are described as follows:

Fig. 1, the utility model front view;

Fig. 2, the utility model lateral plan;

Fig. 3, the extension profilogram of blade 2.

1, propeller hub, 2, blade.

Below in conjunction with accompanying drawing with to make main engine power be that the utility model is described in further detail with the embodiment of the utility model screw propeller for the small wood trawlboat of 58.8KW:

In the present embodiment, blade 2 and propeller hub 1 all adopt ferromanganese brass to make raw MAT'L.Propeller hub 1 is the frustum body, and blade 2 is four leaves, and blade 2 is fixed on the propeller hub 1.This diameter of propeller is 860 millimeters, casterangle θ=15 °.Pitch is distributed as: the 0.2R place is 637 millimeters, and the 0.3R place is 6668.6 millimeters, and the 0.4R place is 700.2 millimeters, 0.5R locating is 731.8 millimeters, 763.4 millimeters at 0.6R place, 793.9 millimeters at 0.7R place, 0.8R locate 826.6 millimeters, 858.2 millimeters at 0.9R place, 1.0R place are 889.8 millimeters.The pitch of blade 2 disappears from blade root to leaf and gives birth to increase by line.All the other are known technology, so seldom narration.

Claims

1, a kind of marine propeller is made of blade (2) and propeller hub (1), and blade (2) is Type B, it is characterized in that the blade that blade (2) increases from blade root to blade tip gradually for pitch.

2, marine propeller according to claim 1 is characterized in that the blade of said blade (2) for pitch linear increase from blade root to blade tip.