Joint surface propeller high speed boat lift-off pitch control device and high speed boat

Abstract

The application discloses a combined surface propeller high-speed boat take-off and landing pitch control device and a high-speed boat. The high-speed boat is driven by two surface propellers. The surface propeller comprises a stern shaft and a propeller installed on the stern shaft. The stern shaft is sleeved in a stern shaft pipe. A pitch control device is arranged between the two stern shaft pipes and located in front of the propeller. The pitch control device comprises a hydrofoil arranged below the stern shaft. The two ends of the hydrofoil are connected with the two stern shaft pipes through connecting structures. Before the high-speed boat takes off and lands, the propeller and the pitch control device are located below the free surface. During the take-off and landing process of the high-speed boat, the hydrofoil is subjected to force, so that the high-speed boat is subjected to a low-pitch torque. The low-pitch torque can offset most of the high-pitch torque, thereby reducing the pitch of the high-speed boat, increasing the visual angle of the driver and improving the steering safety.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, in particular to a device for controlling the take-off and elevation angle of a high-speed boat with a combined surface propeller and the high-speed boat. Background Art

[0002] In order to achieve a quick start, high-speed boats using surface propeller propulsion systems usually adjust the driving device pitch angle to the maximum downward angle, which will increase the lifting moment M ( Figure 1 As shown in the figure, the high-speed boat will have a large elevation angle during the start-up process, affecting the driver's vision. Summary of the Invention

[0003] In view of the above-mentioned shortcomings, the technical problem to be solved by the present invention is: to provide a combined surface propeller thruster high-speed boat take-off elevation angle control device and a high-speed boat, the control device can balance the lifting torque applied to the high-speed boat during the take-off process, reduce the elevation angle of the high-speed boat, increase the driver's field of view, and improve the safety of the take-off process.

[0004] In order to solve the above-mentioned first technical problem, the technical solution of the present invention is:

[0005] A device for controlling the take-off angle of a high-speed boat with a combined surface propeller propulsion system. The high-speed boat is driven by two surface propellers. The surface propellers include a stern shaft and a propeller mounted on the stern shaft. The stern shaft is sleeved in a stern shaft tube. A device for controlling the elevation angle is provided between the two stern shaft tubes. The device for controlling the elevation angle is located in front of the propeller.

[0006] The elevation angle control device includes a hydrofoil located below the stern shaft, and both ends of the hydrofoil are connected to the two stern shaft tubes through connecting structures.

[0007] Preferably, the airfoil profile of the hydrofoil longitudinal section is a NACA66 airfoil profile.

[0008] Preferably, the connecting structure includes a transverse connecting rod and a vertical frame, one end of the transverse connecting rod is connected to the stern tube, the other end of the transverse connecting rod is fixedly connected to the upper end of the vertical frame, and the lower end of the vertical frame is fixedly connected to the end of the hydrofoil.

[0009] Preferably, the cross section of the stand is a NACA16 airfoil.

[0010] Preferably, the cross section of the stand is trapezoidal or arched.

[0011] Preferably, the transverse connecting rod and the stern tube are connected via a universal coupling.

[0012] Preferably, the transverse connecting rod includes a rod body and a telescopic rod, the telescopic rod is threadedly connected to the rod body, the telescopic rod is threadedly connected to a first locking nut, and the telescopic rod is fixedly connected to the first half-shaft of the universal joint.

[0013] Preferably, a shaft sleeve is fixed to the stern tube, and the second half shaft of the universal joint is fixed in the shaft sleeve.

[0014] Preferably, the rod body is threadedly connected to the stand, and the rod body is threadedly connected with a second locking nut.

[0015] In order to solve the above second technical problem, the technical solution of the present invention is:

[0016] A high-speed boat comprises the above-mentioned combined surface propeller propeller high-speed boat take-off elevation angle control device.

[0017] After adopting the above technical solution, the beneficial effects of the present invention are:

[0018] The present application provides a pitch control device between the two stern tubes, located forward of the propeller. The pitch control device comprises a hydrofoil located below the stern shaft, with each end of the hydrofoil connected to the two stern tubes via a connecting structure. Before the high-speed boat takes off, the propeller and pitch control device are located below the free surface of the liquid. During the takeoff process, the hydrofoil is subjected to a force that causes the boat to experience a nose-down moment. This moment can offset most of the nose-down moment, thereby reducing the boat's pitch angle, increasing the driver's field of view, and improving operational safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the pitching moment during the take-off of a high-speed boat using surface propellers in the prior art;

[0020] Figure 2 1 is a schematic structural diagram of an embodiment of a high-speed boat of the present invention;

[0021] Figure 3 This is a schematic diagram of the working of the elevation angle control device for a high-speed boat before taking off;

[0022] Figure 4 This is a schematic diagram of the operation of the elevation angle control device during the high-speed boat's take-off process;

[0023] Figure 5 yes Figure 2 Schematic diagram of the structure of the middle cross link;

[0024] In the figure: 1. propeller; 2. stern tube; 21. shaft sleeve; 3. hydrofoil; 4. cross-link; 41. rod body; 42. telescopic rod; 43. first locking nut; 44. screw; 45. second locking nut; 5. stand; 6. cross-axis universal joint; 7. stern shaft. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Example 1

[0027] like Figure 2 As shown, a device for controlling the pitch angle of a high-speed boat with a combined surface propeller propulsion system is provided. The high-speed boat is driven by two surface propellers. The surface propellers include a stern shaft 7 and a propeller 1 mounted on the stern shaft 7. The stern shaft 7 is sleeved in a stern shaft tube 2. A pitch angle control device is provided between the two stern shaft tubes 2 and is located in front of the propeller 1.

[0028] The pitch angle control device includes a hydrofoil 3 located below the stern shaft 7, and both ends of the hydrofoil 3 are connected to the two stern shaft tubes 2 through connecting structures.

[0029] like Figure 3 As shown in FIG, before the high-speed boat completes the take-off, the pitch angle control device and the propeller 1 are both located below the free liquid surface. When the high-speed boat is sailing at a speed V, the lift FL exerted on the hydrofoil 3 is:

[0030] FL=0.5ρV 2 C L S;

[0031] Where ρ is the fluid density, C L is the lift coefficient of the wing section, and S is the surface area of ​​the hydrofoil 3. To ensure that the high-speed boat takes off quickly, the lift force on the hydrofoil 3 causes the high-speed boat to be subjected to a nose-down moment M0.

[0032] M0=FL·I0.

[0033] The relationship between M0 and the nose-up moment M on the high-speed boat satisfies the following:

[0034] M0≤M;

[0035] Wherein, I0 is the distance between the force application point of the hydrofoil 3 and the center of gravity of the high-speed boat.

[0036] Before the high-speed boat completes its takeoff, the nose-down moment M0 provided by the elevation control device can offset most of the nose-up moment M, reducing the elevation angle of the high-speed boat to a certain extent, thereby increasing the driver's viewing angle and enhancing operational safety.

[0037] like Figure 4 As shown, after the high-speed boat completes its takeoff, half of the propeller 1 is located below the free liquid surface, and the elevation angle control device is located above the free liquid surface. At this time, the hydrofoil 3 no longer provides lift and does not affect the navigation state of the high-speed boat.

[0038] Preferably, the airfoil profile of the longitudinal section of the hydrofoil 3 is a NACA66 airfoil profile.

[0039] The connection structure includes a transverse connecting rod 4 and a vertical frame 5. One end of the transverse connecting rod 4 is connected to the stern tube 2, the other end of the transverse connecting rod 4 is fixedly connected to the upper end of the vertical frame 5, and the lower end of the vertical frame 5 is fixedly connected to the end of the hydrofoil 3.

[0040] The cross section of the stand 5 is a NACA16 airfoil, or a trapezoidal or arched cross section. The shape of the cross section of the stand 5 can assist in steering.

[0041] The transverse connecting rod 4 is connected to the stern tube 2 via a universal joint, such as a cross-shaft universal joint 6 or a ball cage universal joint.

[0042] The cross-link 4 consists of a rod body 41 and a telescopic rod 42. The rod body 41 has a threaded hole at its first end and a screw 44 at its second end. The telescopic rod 42 is threaded into the threaded hole. A first locking nut 43 is also threaded onto the telescopic rod 42, securing the telescopic rod 42 to the first half-axle of the cross-axis universal joint 6. For high-speed boats with different stern-axle distances, the first locking nut 43 is loosened, the telescopic rod 42 is rotated to the appropriate extension length, and then the first locking nut 43 is tightened to secure the adjusted length of the cross-link 4, meeting the requirements of high-speed boats with different stern-axle distances.

[0043] A shaft sleeve 21 is fixed to the stern tube 2 , and the second half shaft of the cross-shaft universal joint 6 is fixed in the shaft sleeve 21 .

[0044] The screw rod 44 is threadedly connected to the vertical frame 5 , and the screw rod 44 is threadedly connected to a second locking nut 45 . The second locking nut 45 is tightened to fix the horizontal connecting rod 4 and the vertical frame 5 together.

[0045] Example 2

[0046] A high-speed boat comprises the combined surface propeller propeller high-speed boat take-off elevation angle control device involved in the first embodiment.

[0047] The foregoing is an example of the best mode of carrying out the present invention. Any portion not described in detail herein is common knowledge within the skill of one of ordinary skill in the art. The scope of protection of the present invention is determined by the claims. Any equivalent transformation based on the technical teachings of the present invention is also within the scope of protection of the present invention.

Claims

1. A device for controlling the take-off angle of a high-speed boat with a combined surface propeller propulsion system. The high-speed boat is driven by two surface propellers. The surface propellers include a stern shaft and a propeller mounted on the stern shaft. The stern shaft is sleeved in a stern shaft tube. The device is characterized in that: An elevation angle control device is provided between the two stern tubes, and the elevation angle control device is located in front of the propeller; The elevation angle control device includes a hydrofoil located below the stern shaft, and both ends of the hydrofoil are connected to the two stern shaft tubes through connecting structures.

2. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 1, characterized in that: The airfoil profile of the hydrofoil longitudinal section is a NACA66 airfoil profile.

3. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 1, characterized in that: The connecting structure includes a transverse connecting rod and a vertical frame, one end of the transverse connecting rod is connected to the stern tube, the other end of the transverse connecting rod is fixedly connected to the upper end of the vertical frame, and the lower end of the vertical frame is fixedly connected to the end of the hydrofoil.

4. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 3, characterized in that: The cross section of the stand is a NACA16 airfoil.

5. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 3, characterized in that: The cross section of the stand is trapezoidal or arched.

6. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 3, characterized in that: The transverse connecting rod is connected to the stern tube via a universal coupling.

7. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 6, characterized in that: The transverse connecting rod includes a rod body and a telescopic rod, the telescopic rod is threadedly connected to the rod body, the telescopic rod is threadedly connected to a first locking nut, and the telescopic rod is fixedly connected to the first half-shaft of the universal joint.

8. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 7, characterized in that: The stern tube is fixed with a shaft sleeve, and the second half shaft of the universal joint is fixed in the shaft sleeve.

9. The device for controlling the take-off angle of a high-speed boat with a combined surface propeller as claimed in claim 7, characterized in that: The rod body is threadedly connected to the stand, and the rod body is threadedly connected to a second locking nut.

10. A high-speed boat, characterized in that: It comprises the lift-off angle control device for a high-speed boat with a combined surface propeller as described in any one of claims 1 to 9.

Images