ES2197404T3 - HELIC CYCLOIDAL. - Google Patents

Abstract

A PROTECTION PLATE IS PROVIDED AT THE END FREE OF THE HELICE ASPES (2); THE PROTECTION PLATE PRESENTS AN INTENSE PROFILE IN THE AREA AROUND THE PLANE OF THE SECTION THROUGH THE EXTREME POSITION OF THE CONTROL POINT FOR GOING FORWARD IN THE SENSE OF THE MARCH, IN SECTIONS (A, B, C) PERPENDICULAR TO THE AXIS BETWEEN THE EXTREME POSITIONS OF THE CONTROL POINT; THE PROTECTION PLATE (2) PRESENTS A PROFILE INTENSE OF APPROXIMATELY THE SAME MAGNITUDE IN THE AREA AROUND THE SECTION PLANE THROUGH THE EXTREME POSITION OF THE CONTROL POINT FOR REVERSE, IN FRONT OF THE RUNNING SENSE.

Description

Cycloidal propeller

The invention concerns a cycloidal propeller with a rotor, where the rotor blades are housed cyclically rotating, the axis of rotation of the rotor and the pivoting axes of the blades run in parallel operation between them and perpendicular and at the free end of the rotor blades are provides a protection plate that is strongly profiled in the direction of travel

A description of a propeller of this type in the separate run of HANSA Nº 16/1965, p. 1543 - 1548, as well as in the publication of the Voith company: Helix Voith-Schneider, 2500 B65, p. 15. In each of these publications, a cycloidal helix is presented that is used for port tugs and presenting a protection plate for the propeller blade blades forward in the direction of March.

Today, a port tug is required that is reached in both directions of travel, that is, for the forward and reverse gear, the same tensile effort out. During the rotation of the blades are generated in your profile the greatest thrusts in the control point area. According to this, the greatest swirling forces also develop and output speeds in this area. In case the propellers are arrange each other, each of the points of Propeller control is located outside in the direction of push. In the reverse direction, they are, by the opposite, inside. The profiling of the protection plate, as extracted from the prior art mentioned Previously, you cannot meet these requirements.

The invention is based on the objective of shaping the protection plate in relation to the important forces of swirl that occur and to a degree of quality correspondingly good suited to the tensile stresses of out for forward and reverse gear.

This objective is achieved according to the invention. through the features of claim 1.

According to this, the profile of the protection plate it is shaped in such a way that in the forward direction there is a strong profiled in front, in the direction of push in front of the propeller in the area of the control point for forward gear, and in the reverse direction is behind the propeller in the control point area for reverse.

Next, the invention is explained from of the figures in the drawing.

Specifically, it represents:

Fig. 1 a partial view of the ship's hull,

Fig. 2 a plan view of the plate protection and

Fig. 3 fundamentally, sections through the protection plate in different planes.

In figure 1, 12 is the bow of a ship, by example of a port tugboat, and 13 is the bottom of the ship, in which the protection plate 2 is fixed by means of struts 9. This protects with each one of the blades of the propeller 1, 1 ' against, for example, contact with the ground or contact with through other foreign bodies. The protection plate 2 is represented again in figure 2, where the circle of the 8 or 8 'blades of the propeller blades that belongs to each of the two propellers arranged here the one next to the another, referring to the direction of travel. Also indicated are extreme positions of control points for forward travel  S and the reverse gear S 'and the eccentricities e_ {v} corresponding (for forward gear) and e_ {r} (for reverse). Additionally, the profiles of flow for forward and reverse through the arrows

From figure 3, it is recognized through the forms of the protection plate given for each of the sections a and c, its profiling. Profiling is recognized as parable primarily in the area between the corresponding song and the circle of the blades. In the central area between the plane of section through the extreme positions of the control point (section b) the transition zone of the plate is recognized protection in which there is no profiling.

In addition, it is recognized that in the area of the plate profiled protection itself, the protection plate narrows towards the song located in front. The edges of the plate protection where there is no profile are also at least slightly rounded. The degree of narrowing of the plate protection is approximately between 40 and 60% of the maximum thickness of it, being the maximum thickness of the plate protection approximately 15% of the diameter of the circle of blades It should also be noted that profiling obviously does not it has to run exactly following a parable.

It is obvious, and should not be mentioned additionally, that profiling is performed in the area of the plate or on the side of it that is opposite the blades. In the Figure 3, these parabola-shaped rounding zones are designated with 5 for forward gear or with 6 for march behind. The central zone or the transition zone with less profiling corresponds to section b.

By this type of embodiment of the plate protection, a good adaptation of the plate is achieved with respect to the degree of quality in the flow conditions on the fly forward or in reverse. The improvement of the quality degree is of approximately 10% compared to a plate made in a way normal.

Claims (6)

1. Cycloidal propeller with a rotor; rotor propeller blades are housed cyclically rotating; the rotational axis of the rotor and the pivoting axes of the blades run parallel to each other and perpendicular during operation; at the free end of the propeller blades (1) a protection plate (2) is provided; the protection plate (2) has a strong profiling (in sections perpendicular to the axis between the extreme positions of the control point (S, S ')) in the area that surrounds the cutting plane through the extreme position (e_ {v}) of the control point for forward travel in the direction March forward. the protection plate (2) has a strong profiling of approximately the same magnitude in the area surrounding the cutting plane, through the extreme position (e_ {r}) of the control point for reversing in the direction reverse. 2. Cycloidal propeller according to claim 1, characterized in that in the center between the planes, through the extreme positions of the control points, the protection plate (2) is poorly profiled. 3. Cycloidal propeller according to claim 1 or 2, characterized in that the profiling of the corresponding edge of the protection plate (2) in the area between the planes through the extreme positions of the control point is carried out at most approximately up to the circle of the blades (8), and in the rest of the area of the protection plate, that is to say its lateral edges (referred to the longitudinal axis of the ship), approximately only the maximum profiling that occurs in the other area is correspondingly provided. . 4. Cycloidal propeller according to one of claims 1 to 3, characterized in that the profiling runs along a parabola. 5. Cycloidal propeller according to one of claims 1 to 4, characterized in that the protection plate, in the area where there is no profiling, narrows in its cross-section in the direction of its edge from which its profiling exits to its located edge in front. 6. Cycloidal propeller according to claim 5, characterized in that the degree of narrowing is between 40 ° and 60 °.