A fin stabilizer device
By adding a water jet system to the anti-roll fin device, the reaction force generated by water jets from the upper and lower surfaces of the fins is utilized, which solves the problem of poor anti-roll performance at low speeds and achieves better anti-roll effect without increasing the fin area.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA SHIP DEV & DESIGN CENT
- Filing Date
- 2021-11-27
- Publication Date
- 2026-06-02
Smart Images
Figure CN113998065B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of special equipment technology for ships, and in particular to a roll-damping fin device. Background Technology
[0002] Anti-roll fins are currently the most widely used active roll reduction device. They typically consist of an electrical control system, a hydraulic system, and a mechanical system, with the mechanical components symmetrically mounted on the bilges on both sides of the ship. When the fin moves relative to the water flow at a certain angle with the ship's speed, the water flowing over the fin generates lift, creating a righting moment that is opposite in direction to the disturbance moment generated by the waves, thus reducing the ship's roll. See [link to documentation]. Figure 1 .
[0003] Conventional anti-roll fins rely on the velocity of the incoming current for lift generation, thus they only reduce roll at medium to high speeds, losing their effectiveness at low speeds and during anchoring. In recent years, all-speed anti-roll fin technology has seen some development. Its control strategy at medium to high speeds is consistent with conventional anti-roll fins; at low speeds, it generates lift through the flapping of the fins to achieve roll reduction. However, its roll reduction effect is weaker at low speeds compared to medium to high speeds.
[0004] Based on existing technology, the only way to improve the roll reduction effect of anti-roll fins at low speeds is to increase the fin area. However, the fin area is usually limited by the overall resources of the ship and is difficult to change significantly. How to further improve the roll reduction performance of anti-roll fins at low speeds while keeping the fin area constant has become an urgent problem to be solved. Summary of the Invention
[0005] The purpose of this invention is to provide a roll-damping fin device that further improves the roll-damping effect at low speeds without increasing the fin area.
[0006] To achieve the above-mentioned technical effects, the technical solution of the present invention is: to provide a roll stabilizing fin device, including an electrical control system, a hydraulic system, and a fin base; the electrical control system is responsible for the operation and control of the entire roll stabilizing fin device, and the hydraulic system is used to drive the rotation of the roll stabilizing fin device;
[0007] It also includes a water spray system; the water spray system consists of a seawater intake, a seawater delivery pipeline, a motor, a spray pump, a hollow fin shaft, fin plates, and spray nozzles;
[0008] The seawater intake port is installed on the hull plating and connected to the seawater delivery pipeline to facilitate seawater intake and minimize the impact of turbulence.
[0009] The seawater delivery pipeline is used to transport seawater between the seawater intake, the spray pump and the spray nozzle;
[0010] The motor is used to drive the injection pump;
[0011] The jet pump is used to pressurize and accelerate seawater before delivering it to the jet nozzle;
[0012] The cooler is used for system heat dissipation;
[0013] The hollow fin shaft is used to fix the fin plates and drive the rotation of the fin plates. The hollow structure of the fin shaft is used to lay seawater delivery pipelines.
[0014] The fin plate is fixedly installed on the fin seat and is the part that generates lift. The water nozzle is installed on the upper and lower plates of the fin plate. After the seawater is ejected through the water nozzle, the water flow will generate a thrust on the fin plate that is proportional to the water flow rate and velocity.
[0015] When one side's fin strikes downwards, the jet nozzles on the lower panel of the fin spray high-speed water. The fin experiences an upward force due to the reaction force of the water flow, which is superimposed on the upward force generated when the fin strikes downwards. At the same time, the other side's fin strikes upwards, and the jet nozzles on the upper panel of the fin spray high-speed water. The fin experiences a downward force due to the reaction force of the water flow, which is superimposed on the downward force generated when the fin strikes upwards. This increases the anti-roll torque of the fin at low speeds, thereby improving the anti-roll performance of the fin system at low speeds.
[0016] Furthermore, the size of the seawater intake, the specifications of the seawater delivery pipe, the specifications of the motor and the spray pump, and the number and size of the spray nozzles can be designed and adjusted according to the overall parameters of the ship and the requirements for roll reduction.
[0017] Furthermore, the seawater transmission pipeline is made of B10 pipe or other seawater corrosion resistant pipe, and the pipeline is laid in accordance with the principle of horizontal and vertical alignment, and is equipped with pipe joints and pipe clamps.
[0018] Furthermore, the seawater intake is located in a region of gentle curve change at the bow, as close as possible to the jet pump.
[0019] Furthermore, a filter and a shut-off valve are installed between the seawater delivery pipeline and the seawater intake.
[0020] Furthermore, the motor is selected as a variable frequency motor.
[0021] Furthermore, the fin has a NACA airfoil profile and consists of a top plate, a bottom plate, a front plate, horizontal partitions, and vertical partitions. The inner surface of the fin is coated with asphalt paint.
[0022] The anti-roll fin device provided by this invention adds a water jet system to the conventional anti-roll fin device. When one side fin strikes downward, the water jet nozzle on the lower panel of the fin sprays a high-speed water jet. The fin is subjected to the reaction force of the water jet and generates an upward force, which is superimposed with the upward force generated when the fin strikes downward, and vice versa. This can further enhance the anti-roll torque of the anti-roll fin and solve the problem of poor anti-roll performance of conventional anti-roll fin devices at low speeds. Attached Figure Description
[0023] The invention will be further described below with reference to the accompanying drawings:
[0024] Figure 1 This is a schematic diagram of the installation of a rock-damping fin device according to the present invention.
[0025] In the diagram, 1 is the seawater intake, 2 is the seawater delivery pipeline, 3 is the motor, 4 is the spray pump, 5 is the cooler, 6 is the hollow fin shaft, 7 is the fin plate, and 8 is the spray nozzle.
[0026] Figure 2 This is a schematic diagram of the external structure of the ship's hull with anti-roll fins.
[0027] Figure 3 This is a schematic diagram of the hollow fin shaft structure.
[0028] The same or similar reference numerals in the accompanying drawings represent the same or similar parts. Detailed Implementation
[0029] The anti-roll fin device proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, and are only used to facilitate and clarify the illustration of the embodiments of this invention.
[0030] The anti-roll fin device provided by this invention adds a water jet system to the conventional anti-roll fin device. When one side fin strikes downward, the water jet nozzle on the lower panel of the fin sprays a high-speed water jet. The fin is subjected to the reaction force of the water jet and generates an upward force, which is superimposed with the upward force generated when the fin strikes downward, and vice versa. This can further enhance the anti-roll torque of the anti-roll fin and solve the problem of poor anti-roll performance of conventional anti-roll fin devices at low speeds.
[0031] This invention provides a novel anti-roll fin device, comprising an electrical control system, a hydraulic system, a fin mount, and a water jet system. The electrical control system is responsible for the operation and control of the entire anti-roll fin device, including the acquisition of ship roll and speed signals, the calculation of control laws, and information exchange with other external devices. The hydraulic system utilizes an electro-hydraulic servo valve to convert electrical signals into hydraulic signals, which are then used by hydraulic cylinders to drive the fin's oscillation. The fin mount is used to install the fin plates. The electrical control system, hydraulic system, and fin mount are similar to existing anti-roll fin technologies and will not be described in detail below. The water jet system will be described in detail below.
[0032] The water jet system consists of a seawater intake, seawater delivery pipeline, motor, jet pump, hollow fin shaft, fin plates, and jet nozzles. The novel anti-roll fin device has jet nozzles on the upper and lower surfaces of the fin plates. When one fin plate strikes downwards, the jet nozzles on the lower surface of the fin plate spray high-speed water. The fin plate experiences an upward force due to the reaction force of the water flow, which is superimposed on the upward force generated when the fin plate strikes downwards. Simultaneously, when the other fin plate strikes upwards, the jet nozzles on the upper surface of the fin plate spray high-speed water. The fin plate experiences a downward force due to the reaction force of the water flow, which is superimposed on the downward force generated when the fin plate strikes upwards. This increases the anti-roll torque of the anti-roll fin at low speeds, thereby improving the anti-roll performance of the anti-roll fin device at low speeds.
[0033] Example 1
[0034] Figure 1 This is a schematic diagram of the installation of a rock-damping fin device according to the present invention; Figure 2 A schematic diagram of the external structure of the anti-roll fin device on the hull. Figure 3 This is a schematic diagram of the hollow fin shaft structure; for reference. Figures 1 to 3 The anti-roll fin device provided in this embodiment mainly consists of an electrical control system, a hydraulic system, fins, and a water spray system (the electrical control system, hydraulic system, and fins are similar to existing anti-roll fin technologies). The water spray system consists of a seawater intake, a seawater delivery pipeline, a motor, a spray pump, a cooler, a hollow fin shaft, fins, and spray nozzles.
[0035] As attached Figure 1 As shown, the seawater intake 1 is installed on the outer plating of the ship and connected to the seawater delivery pipeline. In order to facilitate the intake of seawater and reduce the influence of turbulence, the seawater intake should be arranged in the area of gentle change of the bow line, as close as possible to the spray pump. The external dimensions of the intake should be calculated according to the required flow rate.
[0036] As attached Figure 1 As shown, the seawater delivery pipeline 2 is used for the delivery of seawater between the intake, the spray pump and the spray nozzle. A filter and a shut-off valve should be installed between the seawater delivery pipeline and the seawater intake.
[0037] As attached Figure 1As shown, the motor 3 is used to drive the spray pump. To facilitate the adjustment of the flow rate according to the anti-sway requirements, the motor is selected as a variable frequency motor.
[0038] As attached Figure 1 As shown, the spray pump 4 is used to pressurize and accelerate seawater before delivering it to the spray nozzle.
[0039] As attached Figure 1 As shown, the cooler 5 is used for system heat dissipation.
[0040] As attached Figure 2 As shown, the hollow fin shaft 6 is used to fix the fin plate and drive the rotation of the fin plate, and the hollow structure of the fin shaft is used to lay seawater transmission pipelines.
[0041] As attached Figure 2 As shown, the fin 7 is the part that generates lift. The fin has a NACA airfoil profile and is mainly composed of a top plate, a bottom plate, a front plate, horizontal baffles, and vertical baffles. The inner surface of the fin is coated with asphalt paint.
[0042] As attached Figure 2 As shown, the water jet 8 is installed on the upper and lower plates of the fin. After the seawater is ejected through the water jet, the water flow will generate a thrust on the fin that is proportional to the water flow rate and velocity.
[0043] The contents not described in detail in this specification are prior art known to those skilled in the art. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.
Claims
1. A roll stabilizing fin device, comprising an electrical control system, a hydraulic system, and a fin base; the electrical control system is responsible for the operation and control of the entire roll stabilizing fin device, and the hydraulic system is used to drive the rotation of the roll stabilizing fin device; Its features are, It also includes a water spray system; the water spray system consists of a seawater intake, a seawater delivery pipeline, a motor, a spray pump, a hollow fin shaft, fin plates, a cooler, and spray nozzles; The seawater intake port is installed on the hull plating and connected to the seawater delivery pipeline to facilitate seawater intake and minimize the impact of turbulence. The seawater delivery pipeline is used to transport seawater between the seawater intake, the spray pump and the spray nozzle; The motor is used to drive the injection pump; The jet pump is used to pressurize and accelerate seawater before delivering it to the jet nozzle; The cooler is used for system heat dissipation; The hollow fin shaft is used to fix the fin plates and drive the rotation of the fin plates. The hollow structure of the fin shaft is used to lay seawater delivery pipelines. The fin plate is fixedly installed on the fin seat and is the part that generates lift. The water nozzle is installed on the upper and lower plates of the fin plate. After the seawater is ejected through the water nozzle, the water flow will generate a thrust on the fin plate that is proportional to the water flow rate and velocity. When one side fin strikes downwards, the nozzles on the lower panel of the fin spray high-speed water. The fin is subjected to the reaction force of the water flow, generating an upward force, which is superimposed on the upward force generated when the fin strikes downwards. At this moment, the other fin strikes upward, and the jet nozzles on the upper surface of the fin spray high-speed water. The fin is subjected to the reaction force of the water flow, which generates a downward force. This force is superimposed on the downward force generated when the fin strikes upward, thereby increasing the anti-roll torque of the anti-roll fin at low speeds, and thus improving the anti-roll performance of the anti-roll fin device at low speeds.
2. The anti-roll fin device as described in claim 1, characterized in that, The dimensions of the seawater intake, the specifications of the seawater delivery pipe, the specifications of the motor and the spray pump, and the number and size of the spray nozzles can be designed and adjusted according to the overall parameters of the ship and the requirements for roll reduction.
3. The anti-roll fin device as described in claim 1, characterized in that, The seawater transmission pipeline uses B10 pipe or other seawater corrosion resistant pipes. The pipeline is laid in accordance with the principle of horizontal and vertical alignment and is equipped with pipe joints and pipe clamps.
4. The anti-roll fin device as described in claim 1, characterized in that, The seawater intake is located in a region of gentle curve change at the bow, as close as possible to the jet pump.
5. The anti-roll fin device as described in claim 2, characterized in that, A filter and a shut-off valve are installed between the seawater delivery pipeline and the seawater intake.
6. The anti-roll fin device as described in claim 2, characterized in that, The motor is a variable frequency motor.
7. The anti-roll fin device as described in claim 1, characterized in that, The fin has a NACA airfoil profile and consists of a top plate, a bottom plate, a front plate, horizontal baffles, and vertical baffles. The inner surface of the fin is coated with asphalt paint.