Ship side thruster with tandem paddles

Abstract

The ship side thruster comprises a motor, a stand column, a gear box, a propeller hub, a front side propeller blade set and a rear side propeller blade set, a transmission shaft is arranged in the stand column, an output shaft of the motor is connected with the input end of the gear box through the transmission shaft, the output end of the gear box is fixedly connected with the propeller hub, and the front side propeller blade set and the rear side propeller blade set are arranged on the stand column. The propeller hub is connected to one side of the gear box, the front side propeller blade set and the rear side propeller blade set are arranged on the propeller hub and each comprise five spiral blades, and the spiral blades of the front side propeller blade set and the spiral blades of the rear side propeller blade set are arranged on the peripheral face of the propeller hub in a staggered mode. The blade diameter of the front-side blade group is the same as that of the rear-side blade group, the axial distance between the front-side blade group and the rear-side blade group is 17%-21% of the blade diameter, the pitch ratios of the front-side blade group and the rear-side blade group are the same, and a flow guide cap is arranged at the front end of the propeller hub. The thrust efficiency of the ship side thruster can be improved, and noise can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ship propellers, in particular to a ship thruster adopting tandem blades. Background Art

[0002] A ship thruster is a propeller installed in a transverse pipe at the bow or stern of a ship, and is used for steering a ship. It can drain water from one side of the ship to the other side, and use the reaction force of the water to achieve ship steering. The thruster improves the maneuverability and mobility of the ship, shortens the time to dock and leave the dock, and saves tugboat costs. It is an indispensable device for large ships. Existing ship thrusters generally use 4-blade propellers. Taking a 3.0m diameter thruster as an example, the maximum power of the main engine matched with it is generally around 3500KW, and the maximum thrust is about 500KN. If you want to get more thrust, you usually use the method of increasing the main engine power or increasing the blade diameter.

[0003] The patent document with publication number CN206813277A discloses a ship tandem propeller device, in which the blades include front blades and rear blades, and the front blades and the rear blades are arranged in a front-to-back sequence along the propeller axis A direction and are staggered with each other. The pitch of the rear blades is greater than the pitch of the front blades. Through this arrangement, the influence of cavitation on the power and life of the propeller is reduced at high speeds.

[0004] This type of tandem propeller thruster has different flow directions and speeds between the front and rear propellers, so the blade positions of the front and rear propellers need to be staggered, and the pitch of the rear propeller needs to be optimized according to the wake conditions of the front propeller at the highest speed, and is generally larger than the pitch of the front propeller. However, the problem with this type of thruster is that the pitch of the front and rear propellers needs to be changed, which makes the preparation process of the propeller complicated, resulting in a high manufacturing cost of the thruster, and the pitch change needs to be adapted to the speed of the ship. Since the speed of the ship cannot be fixed, this pitch change cannot effectively improve the performance of the thruster. Utility Model Content

[0005] The utility model aims to provide a ship thruster using tandem blades in view of the problems existing in the existing propellers described in the background technology.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A ship thruster using tandem blades comprises a motor, a column, a gearbox, a hub, a front blade group and a rear blade group, wherein the motor is arranged at the top end of the column, the gearbox is designed at the lower end of the column, a transmission shaft is arranged in the column, the output shaft of the motor is connected to the input end of the gearbox through the transmission shaft, the output end of the gearbox is fixedly connected to the hub, the hub is connected to one side of the gearbox, the front blade group and the rear blade group are respectively arranged on the hub, the front blade group and the rear blade group both comprise five spiral blades, the spiral blades of the front blade group and the rear blade group are respectively staggered on the outer circumferential surface of the hub, the blade diameter of the front blade group is the same as the blade diameter of the rear blade group, the axial spacing between the front blade group and the rear blade group is 17% to 21% of the blade diameter, the pitch ratio of the front blade group and the rear blade group is the same, and a guide cap is arranged at the front end of the hub.

[0008] In the above solution, the hub is a conical member, and the diameter of the hub gradually decreases from the rear side to the front side.

[0009] In the above scheme, the five blades of the front blade group and the rear blade group are distributed at equal intervals along the outer circumference of the hub.

[0010] In the above scheme, the five blades of the front blade group and the rear blade group are all blades with no lateral inclination, no longitudinal inclination and no camber.

[0011] The utility model has positive effects: 1) The ship thruster adopting tandem blades of the utility model, without increasing the motor power and the blade diameter, designs a front blade group and a rear blade group on the hub, and shares the load through two groups of blades, so that the load of each blade is reduced, thereby reducing noise and vibration; 2) The axial spacing between the front blade group and the rear blade group of the ship thruster adopting tandem blades of the utility model is designed to be 17% to 21% of the blade diameter, which can make the coordination between the front blade group and the rear blade group better, further improve the propulsion efficiency of the ship thruster, and reduce noise; 3) The ship thruster adopting tandem blades of the utility model can further improve the propulsion performance of the propeller and reduce vibration by setting a guide cap; 4) The ship thruster adopting tandem blades of the utility model, the front blade group and the rear blade group are designed to have the same diameter and pitch ratio, which is easy to manufacture and can reduce the manufacturing cost of the propeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic structural diagram of a ship thruster adopting tandem blades.

[0013] The reference numerals in the figure are: motor 1, column 2, gear box 3, hub 4, front blade group 5, rear blade group 6, guide cap 7. DETAILED DESCRIPTION

[0014] 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.

[0015] like Figure 1 A ship thruster using tandem blades is shown, which includes a motor 1, a column 2, a gear box 3, a hub 4, a front blade group 5 and a rear blade group 6.

[0016] The motor 1 is arranged at the top of the column, the gear box 3 is designed at the lower end of the column 2, a transmission shaft is arranged in the column 2, the output shaft of the motor 1 is connected to the input end of the gear box 3 through the transmission shaft, the output end of the gear box 3 is fixedly connected to the hub 4, and the hub 4 is connected to one side of the gear box 3, as shown in the attached figure. Figure 1 As shown, the hub 4 is arranged on the left side of the gear box 3. The front blade group 5 and the rear blade group 6 are arranged on the hub 4 respectively.

[0017] The front blade group 5 and the rear blade group 6 both include five spiral blades, and the spiral blades of the front blade group 5 and the rear blade group 6 are staggered on the outer circumferential surface of the hub 4. The blade diameter of the front blade group 5 is the same as the blade diameter of the rear blade group 6. The five blades of the front blade group 5 and the rear blade group 6 are equally spaced along the outer circumference of the hub 4; the five blades of the front blade group 5 and the rear blade group 6 can all be blades with no lateral inclination, no longitudinal inclination, and no camber.

[0018] The axial spacing between the front blade group 5 and the rear blade group 6 is 17% to 21% of the blade diameter, the front blade group 5 and the rear blade group 6 have the same pitch ratio, and a guide cap 7 is provided at the front end of the hub 4.

[0019] The hub 4 can be a conical member, and the diameter of the hub 4 gradually decreases from the rear side to the front side. Through this arrangement, it can cooperate with the guide cap 7 to improve the propulsion performance of the ship thruster. Compared with the propeller with only one set of blade groups, the length of the hub 4 is increased by 25%, so that the front blade group 5 and the rear blade group 6 can be arranged on the hub 4, and the axial spacing between the front blade group 5 and the rear blade group 6 can be guaranteed to meet the design requirements.

[0020] When the ship thruster adopting the tandem blades of the utility model is in use, the transmission shaft in the column is driven to rotate by the motor, which in turn drives the gears in the gear box to rotate, and the speed and torque are adjusted by the gears to drive the hub to rotate, and then drive the front blade group and the rear blade group to rotate, thereby realizing the thrust function of the ship thruster.

[0021] The utility model adopts a ship thruster with tandem blades. Without increasing the motor power and the blade diameter, a front blade group and a rear blade group are designed on the hub. The load is shared by the two blade groups, so that the load of each blade is reduced, thereby reducing noise and vibration.

[0022] The utility model adopts a ship thruster with tandem blades, and the axial spacing between the front blade group and the rear blade group is designed to be 17% to 21% of the blade diameter, which can make the front blade group and the rear blade group better matched, further improve the propulsion efficiency of the ship thruster, and reduce noise.

[0023] The ship thruster adopting the tandem blades of the utility model can further improve the propulsion performance of the thruster and reduce vibration by arranging the guide cap.

[0024] The utility model adopts a ship thruster with tandem blades, wherein the front blade group and the rear blade group are designed to have the same diameter and pitch ratio, which is convenient for manufacturing and can reduce the manufacturing cost of the propeller.

[0025] Although the 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 ship thruster using tandem blades, characterized in that: The propeller comprises a motor, a column, a gearbox, a hub, a front blade group and a rear blade group. The motor is arranged at the top end of the column, the gearbox is designed at the lower end of the column, a transmission shaft is arranged in the column, the output shaft of the motor is connected to the input end of the gearbox through the transmission shaft, the output end of the gearbox is fixedly connected to the hub, the hub is connected to one side of the gearbox, the front blade group and the rear blade group are respectively arranged on the hub, the front blade group and the rear blade group both include five spiral blades, the spiral blades of the front blade group and the rear blade group are respectively staggered on the outer circumferential surface of the hub, the blade diameter of the front blade group is the same as the blade diameter of the rear blade group, the axial spacing between the front blade group and the rear blade group is 17% to 21% of the blade diameter, the pitch ratio of the front blade group and the rear blade group is the same, and a guide cap is arranged at the front end of the hub.

2. The ship thruster using tandem blades according to claim 1, characterized in that: The propeller hub is a conical member, and the diameter of the propeller hub gradually decreases from the rear side to the front side.

3. The ship thruster using tandem blades according to claim 1, characterized in that: The five blades of the front blade group and the rear blade group are respectively distributed at equal intervals along the outer circumference of the hub.

4. The ship thruster using tandem blades according to claim 1, characterized in that: The five blades of the front blade group and the rear blade group are blades without lateral inclination, longitudinal inclination and camber.

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