CN2188072Y

CN2188072Y - Propeller

Info

Publication number: CN2188072Y
Application number: CN 94210210
Authority: CN
Inventors: 黄善宗
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-24
Filing date: 1994-04-24
Publication date: 1995-01-25
Anticipated expiration: 2004-04-24

Abstract

The utility model relates to a propeller for propelling the ship. The propeller is characterized in that the front face of the blade is provided with a cambered blade, the screw pitch among radical direction points are equal, the screw pitch among axial direction points are unequal, the screw pitch of a trailing edge is larger than the screw pitch of a leading edge, and the back side of the blade is an inclined triangle pole surface. The ratio of the distance from the top line of the inclined triangle pole to the leading edge and the distance from the top line of the inclined triangle pole to the trailing edge is 1 to 3. Through test, the propulsion efficiency of ships is enhanced by 10% to 15% and the material is saved by one third.

Description

Propeller

The utility model relates to a kind of screw propeller, belongs to marine propulsion.

The existing screw propeller that is applied on the power driven vessel, the pitch of all each points equates on the screw propeller blade face, adopts this shape blade screw propeller, at oar during as propelling unit, because can not accomplish that friction entry, blade face, blade back all produce a large amount of cavitys, power consumption is big, efficient is also relatively low.

At above-mentioned shortcoming, it is main that the purpose of this utility model just is to provide the more conventional true screw of a kind of propulsion coefficient, during as propelling unit, only produces the microvoid bubble, the screw propeller of little vibration at oar.

The utility model is achieved like this, the leaf front of propeller blade is a cambered blade, the pitch of the radially each point of its curved surface equates, the pitch of the axial each point of curved surface is unequal, and the pitch of lagging edge is greater than the pitch of guide margin, such screw propeller not only water initial point can effectively be quickened after entering blade, can improve the propulsive force of blade, and when the blade entry, be difficult for producing cavity, in actual applications, in order further to improve the reversing sensitivity of boats and ships, the leaf back of the utility model blade is oblique triangle cylinder, and oblique trequetrous top line from guide margin distance be 1 to 3 from ratio with back gauge.

Advantage of the present utility model: 1, raise the efficiency, use according to reality, owing to realize the microvoid bubble during screw propeller entry of the present utility model, and the water initial point can effectively be quickened on blade, use the boats and ships and other screw propeller boats and ships of use of screw propeller of the present utility model, can raise the efficiency 10～15%, saving in material 1/3rd.2, because screw propeller of the present utility model than little with the screw propeller blade face of equipower boats and ships, in operation, can reduce the winding of screw blade in the face of foreign material in the water.

Fig. 1 is screw propeller a slice blade lateral plan of the present utility model.

Below in conjunction with accompanying drawing 1, architectural feature of the present utility model, screw propeller of the present utility model is made up of propeller hub (1) and blade (2), and the profile of blade is by guide margin (3), lagging edge (4), lateral projection's profile (5), blade tangent plane (6) and oblique triangular prism top line (7) are formed, and are cambered blade in blade leaf front, be that radially pitch is equal on the blade face, axial pitch is unequal, and the pitch of lagging edge (4) is greater than the pitch of guide margin (3), and the leaf back of blade is oblique triangle cylinder.The positive intersection with blade tangent plane (6) of blade is the AB curve, and the intersection of the blade back side and blade tangent plane (6) is AD and DB two straight lines, and blade lateral projection profile (5) is downward-sloping, near lagging edge.

The utility model can forge or cast and form with metallic material (for example: Stainless Steel, cast iron, cast copper).

Claims

1, a kind of screw propeller is made up of propeller hub (1) and blade (2), it is characterized in that the leaf front of blade is cambered blade, the radially pitch that is curved surface equates, the axial pitch of curved surface is unequal, and the pitch of lagging edge (4) is greater than the pitch of guide margin (3), and the leaf back of blade is oblique triangle cylinder.

2, screw propeller according to claim 1 is characterized in that oblique trequetrous top line (7) is 1 to 3 from guide margin (3) distance with ratio from lagging edge (4) distance.