Rudder and propeller combined balanced pod thruster

Abstract

The invention provides a rudder and propeller combined balanced pod thruster, and belongs to the technical field of ship pod type electric propulsion systems. In order to solve the problems that an existing thruster is lagged in control response, insufficient in steering precision, low in thrust efficiency and the like, a motor-horizontal gear-vertical gear is adopted to drive a propeller, and efficient thrusting and fine steering are achieved in combination with the technical scheme that a contraction-expansion venturi guide pipe and a front rudder plate are combined; the propeller can be widely applied to the occasions of port operation, shallow water navigation and high-precision control.

Description

Technical Field

[0001] The present invention relates to the technology of ship propulsion devices, and specifically to a balanced podded thruster integrating a rudder plate and a propeller, belonging to the field of ship podded electric propulsion systems. Background Art

[0002] In the technical field of ship podded electric propulsion systems, the existing technologies mainly include the following technical solutions: The podded full-rotation electric propulsion system, such as the "podded full-rotation ship electric propulsion system" disclosed in CN109625223B, integrates a permanent magnet synchronous motor and a propeller in the pod, and realizes 360° thrust vector control through overall rotation, improving maneuverability and energy efficiency. However, the system cancels the independent rudder plate and lacks the pre-guiding function for the inflow field. The podded propulsion device with a rudder plate, such as the "podded ship electric propulsion system device" disclosed in CN202320761U, sets an independent rudder plate on one side of the pod to assist in steering control. However, there is no integrated Venturi duct structure between its rudder plate and the propeller, and the propulsion efficiency and low-speed maneuverability still need to be improved. The ducted propeller propulsion technology, such as the ducted thruster in CN2018116551642, forms a convergent-divergent flow channel by surrounding the impeller with a duct to enhance thrust and improve cavitation performance. However, most of the related technologies do not integrate the duct and the rudder plate, making it difficult to balance efficient propulsion and fine steering.

[0003] Although the above-mentioned published documents have made improvements in terms of maneuverability, steering assistance, and thrust efficiency respectively, they have not provided a podded propulsion device that can place the rudder plate in front, integrate it with the propeller and the duct, and achieve efficient propulsion and precise steering through simplified gear transmission. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides the following technical solutions: A balanced podded thruster with a combined rudder and propeller, characterized by comprising: A motor (110) installed on the upper part of the pod housing; A horizontal drive gear (120) coaxial with the motor; A second gear (130) meshing laterally with the horizontal drive gear and having a vertical axis; A propeller shaft (140) coaxially arranged with the second gear, and a propeller impeller (150) is fixed to the lower end of the propeller shaft; A duct (170) sleeved on the outer periphery of the propeller impeller, and the inner diameter of the duct gradually decreases from front to back; A fixed rudder plate (160) disposed at the front end of the duct and coaxial with the propeller shaft; wherein, the motor drives the horizontal drive gear to rotate, and drives the propeller to rotate through the horizontal-vertical gear transmission; the duct forms a Venturi effect to improve the thrust efficiency; the rudder plate pre-guides the oncoming flow to improve the steering response.

[0005] Furthermore, the cross-section of the duct with gradually decreasing inner diameters at the front and rear forms a converging-diverging flow channel to accelerate the water flow and reduce turbulence. A gap is reserved between the rudder plate and the propeller impeller to avoid interference.

[0006] The technical solution of the present invention is consistent with the technical features defined in claim 1, and can be further optimized according to actual needs by implementing means such as adjusting the gear module or duct cross-section parameters. Advantages

[0007] Compared with the prior art, the present invention has the following advantages: Setting the rudder in front of the propeller can achieve active control of the incoming water flow field and improve the maneuvering stability; Adopting a gear steering transmission structure simplifies the internal structure of the pod and reduces the maintenance difficulty; Integrating the duct structure improves the propulsion efficiency and the low-speed operation performance; The structure is compact and has strong adaptability, and is suitable for shallow water or port navigation environments. Description of the Drawings

[0008] Figure 1 It is a schematic side view structure diagram of the pod thruster of the present invention; Figure 2 It is a schematic three-dimensional structure diagram of the pod thruster of the present invention.

[0009] In the figure: 100 - pod housing; 110 - motor; 115 - transmission column; 120 - horizontal drive gear; 130 - vertical drive gear; 140 - propeller shaft; 150 - propeller impeller; 160 - rudder plate; 170 - duct. Specific Embodiments

[0010] The following combines the attached Figure 1 and the attached Figure 2 , and details a preferred embodiment of the present invention, so that those skilled in the art can implement the present invention according to the content of the specification.

[0011] In this embodiment, the main components of the balanced rudder-propeller pod thruster and their connection relationships are as follows:

[0012] The pod housing (100) is a streamlined sealed outer shell, and a motor support base and a gear transmission mechanism are installed inside the shell. The shell is provided with a top mounting hole and a front duct interface.

[0013] The motor (110) is fixed to the mounting hole on the top of the pod housing by bolts, and the lower end of the motor output shaft is connected to the transmission column (115). The transmission column (115) and the housing are matched through bearings to ensure rotation reliability.

[0014] A horizontal driving gear (120) is fixedly provided at the lower end of the transmission column (115). The horizontal driving gear (120) is coaxial with the transmission column and is arranged around the transmission column, and its tooth surface is meshed with the vertical driving gear (130).

[0015] The vertical drive gear (130) is fixed to the inner side of the housing via a rotating shaft bracket, and its axis is perpendicular to the tooth surface of the horizontal drive gear (120). The lower end of the vertical drive gear is coaxially connected to the propeller shaft (140).

[0016] A propeller impeller (150) is installed at the lower end of the propeller shaft (140), and a 5mm gap is retained between the propeller impeller and the conduit (170). The conduit (170) is connected to the front interface of the shell through a flange, and the inner diameter of the conduit gradually decreases from front to back to form a contraction-expansion flow channel.

[0017] The rudder plate (160) is fixedly mounted on the front end of the conduit (170), and the width of the rudder surface matches the inner diameter of the conduit. The rudder plate and the propeller are coaxially arranged to pre-guide the water flow before it enters the conduit.

[0018] When the motor (110) is powered on, its output shaft drives the transmission column (115) and the horizontal drive gear (120) to rotate; the horizontal drive gear (120) engages with the vertical drive gear (130) to achieve 90° rotation transmission; the vertical drive gear (130) drives the propeller shaft (140) and the impeller (150) to rotate, generating thrust.

[0019] After the water flow generated by the rotation of the propeller passes through the contraction-expansion channel of the duct (170), the flow velocity increases and the turbulence decreases. At the same time, the rudder (160) deflects and guides the incoming flow, thereby achieving efficient propulsion and flexible steering.

[0020] The materials, dimensions, and installation methods of the various structural components in this embodiment can be appropriately adjusted according to the ship type and operating conditions. The above embodiments are intended only to illustrate the principles of the present invention and should not be construed as limiting the invention. Any equivalent substitutions or improvements within the scope of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A balanced pod thruster with a combined rudder and propeller. The necessary technical features common to the subject of the thruster and the closest prior art pod thruster include a pod housing, a motor, and a propeller. It is characterized in that: The motor (110) is installed on the upper part of the nacelle housing, and its output end meshes with a vertically arranged second gear (130) through a horizontally arranged first gear (120); the second gear (130) is coaxially connected to a propeller shaft (140), and a propeller impeller (150) is installed at the lower end of the propeller shaft; a duct (170) is sleeved outside the propeller impeller (150), and the inner diameter of the duct gradually decreases from front to back; a rudder plate (160) is coaxially fixed at the front end of the duct (170); the motor drives the first gear (120) to rotate, and drives the propeller impeller (150) to rotate through the meshing of the first gear and the second gear (130) in sequence; the duct forms a Venturi effect to improve the thrust efficiency, and the rudder plate pre-guides the oncoming flow to improve the steering response.

2. The pod thruster according to claim 1, characterized in that: The cross-section of the duct (170) with a gradually decreasing inner diameter from front to back forms a converging-diverging flow channel.

3. The pod thruster according to claim 1, characterized in that: A 5-mm gap is reserved between the rudder plate (160) and the propeller impeller (150) to avoid mutual interference.

4. The pod thruster according to claim 1, characterized in that: The first gear (120) and the second gear (130) have the same gear module to ensure the transmission accuracy.

5. The pod thruster according to claim 1, characterized in that: The motor (110) is an AC variable-frequency motor or a DC motor.

6. The podded thruster according to claim 1, characterized in that: The propeller impeller (150) is a fixed-pitch impeller or a variable-pitch impeller.

7. The pod thruster according to claim 1, characterized in that: The material of the propeller duct (170) is made of corrosion-resistant plastic or aluminum alloy.

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