A propeller with front and rear blades connected as one

Abstract

The utility model discloses a propeller with front and rear blades connected as one, which includes a propeller shaft and multiple groups of blades, the multiple groups of blades are fixedly arranged on the propeller shaft, each group of blades includes a front blade part, an outer end plate and a rear blade part, the front blade part and the rear blade part have the same structure, and the front blade part and the rear blade part are connected by the outer end plate. The propeller of the utility model has multiple groups of blades arranged on the propeller shaft, each group of blades includes a front blade part, an outer end plate and a rear blade part, the blades of this structure have the structural features of an end plate propeller, an outer end plate is arranged at the outer end of the blade, and the front blade part and the rear blade part form a tandem propeller structure, through this arrangement, the propeller can have the advantages of both the end plate propeller and the tandem propeller, improve the propulsion efficiency of the propeller, and reduce vibration and noise.

Description

Technical Field

[0001] The utility model relates to the technical field of ship propellers, in particular to a propeller with front and rear blades connected as one. Background Art

[0002] In the prior art, a propeller of a ship thruster generally includes a shaft and a plurality of blades arranged on the shaft. Common blades are spiral curved plates. In order to improve the performance of the propeller, end plate propellers and tandem propellers are designed.

[0003] An endplate propeller is a propeller that has a certain chord length at the blade tip and is equipped with a small endplate. The endplate separates the pressure field between the blade surface and the blade back, weakens the lateral flow at the blade tip, and increases the pressure difference between the blade surface and the blade back, thereby making the propeller produce greater thrust and improving the propulsion efficiency of the propeller. In addition, the endplate propeller also has better cavitation performance, which is conducive to reducing the vibration and noise caused by the propeller.

[0004] Tandem propellers are two ordinary propellers installed on the same shaft, rotating in the same direction. Compared with ordinary propellers, tandem propellers can achieve higher propulsion efficiency under the conditions of the same power and the same diameter. Tandem propellers have great advantages when the propeller load is heavy or the diameter is limited. In addition, since the single propeller load of the tandem propeller is lighter, its vibration and noise are smaller than those of conventional propellers.

[0005] Although both the end plate propeller and the tandem propeller can improve the performance of the propeller, in the prior art, the end plate propeller and the tandem propeller are still not used in combination to fully utilize the advantages of the two propellers to further improve the performance of the propeller. Utility Model Content

[0006] The utility model aims to provide a propeller with front and rear blades connected as one body, which can fully utilize the advantages of two propellers to further improve the performance of the propeller, in view of the problems existing in the existing propellers described in the background technology.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A propeller with front and rear blades connected as one, comprising a propeller shaft and multiple groups of blades, wherein the multiple groups of blades are fixedly arranged on the propeller shaft, each group of blades comprises a front blade portion, an outer end plate and a rear blade portion, the front blade portion and the rear blade portion have the same structure, and the front blade portion and the rear blade portion are connected by the outer end plate.

[0009] In the above solution, the diameter of the paddle shaft gradually decreases from the rear side to the front side.

[0010] In the above solution, the front blade part and the rear blade part are smoothly connected through the outer end plate. Through this arrangement, the stability of the propeller can be improved and the vibration and noise can be reduced.

[0011] In the above scheme, the pitch angle of the front blade portion is 2°~5°; the pitch angle of the rear blade portion is -2°~-5°; the front blade portion and the rear blade portion are both distributed with equal chord length, and the ratio of chord length to diameter is 1:5; the skew angles of the front blade portion and the rear blade portion are both 5°~10°; the camber of the front blade portion and the rear blade portion are both 0, the pitch ratio of the front blade portion is in the range of 0.8~1.4, and the pitch ratio of the rear blade portion is 0.15 smaller than that of the front blade.

[0012] The utility model has positive effects: the propeller of the utility model is provided with multiple groups of blades on the propeller shaft, and each group of blades includes a front blade part, an outer end plate and a rear blade part. The blades of this structure have the structural characteristics of the end plate propeller, and the outer end plate is provided at the outer end part of the blade, and the front blade part and the rear blade part form a tandem propeller structure. Through this arrangement, the propeller can have the advantages of the end plate propeller and the tandem propeller at the same time, improve the propulsion efficiency of the propeller, and reduce vibration and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the front structure of the propeller of the utility model.

[0014] Figure 2 It is a three-dimensional structural schematic diagram of the propeller of the utility model.

[0015] The reference numerals in the figure are: propeller shaft 1 , propeller blade 2 , front propeller blade portion 21 , outer end plate 22 , rear propeller blade portion 23 . DETAILED DESCRIPTION

[0016] The technical solution of the utility model is described clearly and completely below through embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] like Figure 1 A propeller is shown, which comprises a propeller shaft 1 and a plurality of groups of blades 2.

[0018] The paddle shaft 1 is a columnar paddle shaft, and the diameter of the paddle shaft 1 gradually decreases from the rear side to the front side.

[0019] The number of blades 2 can be set as needed, for example, 3 groups of blades 2, 4 groups of blades or 5 groups of blades can be set. The blades 2 are evenly distributed on the propeller shaft 1 in the circumferential direction.

[0020] Each set of blades 2 includes a front blade portion 21, an outer end plate 22 and a rear blade portion 23, and the front blade portion 21 and the rear blade portion 23 are smoothly connected through the outer end plate 22. The inner ends of the front blade portion 21 and the rear blade portion 23 are fixedly connected to the propeller shaft 1, and the front blade portion 21 is arranged at the front side of the rear blade portion 23.

[0021] The longitudinal inclination angle of the front blade portion 21 is 2° to 5°; the longitudinal inclination angle of the rear blade portion 23 is -2° to -5°; the front blade portion 21 and the rear blade portion 23 are both distributed with equal chord length, and the ratio of chord length to diameter is 1:5; the skew angles of the front blade portion 21 and the rear blade portion 23 are both 5° to 10°, and the front blade portion 21 and the rear blade portion 23 are both small skew propellers; the camber of the front blade portion 21 and the rear blade portion 23 are both 0, that is, the front blade portion 21 and the rear blade portion 23 both have an airfoil profile; the pitch ratio of the front blade portion 21 ranges from 0.8 to 1.4, and the pitch ratio of the rear blade portion 23 is 0.15 smaller than that of the front propeller.

[0022] When the propeller of the utility model is used, it can be used by simply connecting the propeller shaft to the ship propeller. The design of the utility model combines the advantages of the end plate propeller and the tandem propeller, can improve the propulsion efficiency of the propeller, and reduce vibration and noise.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A propeller with front and rear blades connected as one, characterized in that: It includes a propeller shaft and multiple groups of blades, which are fixed on the propeller shaft, each group of blades includes a front blade part, an outer end plate and a rear blade part, and the front blade part and the rear blade part are connected through the outer end plate.

2. The propeller with front and rear blades connected as one according to claim 1, characterized in that: The diameter of the paddle shaft gradually decreases from the rear side to the front side.

3. The propeller with front and rear blades connected as one according to claim 1, characterized in that: The front blade portion and the rear blade portion are smoothly connected via an outer end plate.

4. The propeller with front and rear blades connected as one according to claim 1, characterized in that: The longitudinal inclination angle of the front blade portion is 2° to 5°; the longitudinal inclination angle of the rear blade portion is -2° to -5°; the front blade portion and the rear blade portion are both distributed with equal chord lengths, and the ratio of chord length to diameter is 1:5; the skew angles of the front blade portion and the rear blade portion are both 5° to 10°; the camber of the front blade portion and the rear blade portion are both 0, the pitch ratio of the front blade portion is in the range of 0.8 to 1.4, and the pitch ratio of the rear blade portion is 0.15 smaller than that of the front blade.

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