Propeller propelling system for shallow-channel ship

Abstract

The invention relates to a shallow-channel ship propeller propulsion system which comprises a shaft body, a plurality of blades distributed along the circumference of a central shaft of the shaft body in an array mode are arranged on the periphery of the shaft body, each blade comprises at least two flexible sections, the flexible sections are made of memory metal and are arranged to deform along with changes of water flow, and the flexible sections are arranged on the periphery of the shaft body. The flexible sections and / or the flexible sections and the shaft body are connected through hinge assemblies, the hinge assemblies enable the flexible sections to swing in the extending direction of the paddles, the shaft body is further provided with a through hole in the axial direction, a sliding block is arranged in the through hole in a sliding mode, the outer side of the shaft body is further provided with a flow guide cover, and the flow guide cover and the shaft body are coaxially arranged. When the sliding block slides along the through hole, the flow guide cover moves in the axial direction of the shaft body. According to the shallow channel ship propeller propelling system, the propeller blades formed by the multiple flexible sections can be passively adjusted according to the actual shallow water environment, and the shallow channel ship propeller propelling system can adapt to the complex and changeable shallow water environment.

Description

Technical Field

[0001] The present invention relates to the technical field of ship propulsion systems, and in particular to a propeller propulsion system for shallow channel ships. Background Art

[0002] Compared with deep waters, when a ship sails in shallow waters, the propeller will be affected by the vibrations caused by the water flow, and cavitation (bubbles) will form in the low-pressure area on the surface of the propeller blades. When these cavitations burst, they will produce impact. Long-term effects will cause metal fatigue and shorten the life of the propeller. In existing technologies, this problem is usually alleviated by optimizing the propeller shape and performing surface treatment on the propeller.

[0003] When the same propeller shape is used to cope with complex and changeable shallow water environments, the existing technology usually adapts to this complex and changeable shallow water environment by deforming the propeller itself. Since the deformation range of the propeller itself is limited, its adaptability to the complex and changeable shallow water environment is limited. Therefore, there is an urgent need for a shallow channel ship propeller propulsion system that can adapt to complex shallow water environments. Summary of the Invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the inability of the propeller propulsion system in the prior art to adapt to the complex and changeable shallow water environment, and thus provide a propeller propulsion system for shallow channel ships that can adapt to the complex shallow water environment.

[0005] In order to solve the above technical problems, the present invention provides a propeller propulsion system for shallow channel ships, comprising: The shaft body has an outer periphery provided with: A plurality of blades, the blades comprising: At least two flexible segments, each of which is made of memory metal and configured to deform with changes in water flow, with the following passing between each flexible segment and / or between the flexible segment and the shaft: The hinge assembly is connected, and the hinge assembly enables the flexible section to swing along the extension direction of the blade. The axial direction of the shaft body is also provided with: A through hole, wherein the through hole is slidably provided with: The outer side of the shaft body is also provided with a slider coaxially arranged with the shaft body: The air guide cover moves along the axial direction of the shaft body when the slider slides along the through hole.

[0006] As a further improvement of the present invention, the deflector is composed of: At least two arc segments are spliced ​​together, each arc segment passing through: The traction rod is connected with the sliding block.

[0007] As a further improvement of the present invention, it also includes: A hydraulic system is connected to the shroud. When the ship speed or water depth changes, the relationship between the deployment angle of the shroud and the ship speed and water depth is: ,in is the expansion angle of the shroud, is the speed, For water depth.

[0008] As a further improvement of the present invention, the inner side of the deflector is provided with: There are at least two cutting pieces, and the cutting pieces are evenly distributed along the inner circumference of the air guide cover.

[0009] As a further improvement of the present invention, the inner side of the deflector is provided with: The accommodating groove is used to accommodate the cutting member.

[0010] As a further improvement of the present invention, the through hole is further provided with: The guide rod is sleeved on the slide block and slides along the guide rod.

[0011] As a further improvement of the present invention, it also includes: The optical detection module for sand content is used to detect the sand content in the water flow. The rotation speed of the shaft ,in is the shaft speed, is the sand content, For water depth, is the initial speed, is the initial water depth.

[0012] As a further improvement of the present invention, the pitch ratio is 0.6283.

[0013] As a further improvement of the present invention, the camber gradient ratio of the propeller is 5%-12%.

[0014] As a further improvement of the present invention, the blade is of MAU type.

[0015] The above technical solution of the present invention has the following advantages over the prior art: The present invention provides a propeller propulsion system for shallow channel ships. The blades formed by multiple flexible sections can have a larger adaptability range and are passively adjusted according to the actual shallow water environment. At the same time, the flexible sections made of memory metal will gradually return to their original shape after the external force disappears, thereby ensuring normal use. In addition, the connection through the hinged assembly ensures that the flexible sections will not separate from each other and can rotate smoothly, so that the blades can adjust to the shape that adapts to the water flow environment more quickly after being subjected to external force, thereby improving the response speed of the propulsion system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the propeller propulsion system for shallow channel ships in the preferred embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the propeller propulsion system for shallow channel ships in the preferred embodiment of the present invention. Figure 2 ; Figure 3 2. It is a front view of a propeller propulsion system for shallow channel ships according to a preferred embodiment of the present invention; Figure 4 yes Figure 3 Cross-sectional view along the AA axis.

[0017] Explanation of the reference numerals in the specification: 1. shaft; 101. through hole; 102. guide rod; 2. blade; 201. flexible section; 202. hinge assembly; 3. slider; 4. fairing; 5. traction rod; 6. cutting piece. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0019] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "fixed on" another element, or "fixedly connected" to another element, they may be fixed in a detachable manner or in a non-detachable manner. When an element is considered to be "connected" or "rotatably connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used are for illustrative purposes only and do not represent the only implementation method.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to constrain the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] The terms "first", "second", "third" and the like in the present invention do not represent specific quantities and orders, but are only used to distinguish names.

[0022] In some embodiments, reference Figures 1-4 As shown, a propeller propulsion system for a shallow channel ship of the present invention comprises: The shaft body 1 has an outer periphery provided with: A plurality of blades 2, each blade 2 comprising: At least two flexible segments 201 are made of memory metal and are configured to deform with changes in water flow. Between each flexible segment 201 and / or between the flexible segment 201 and the shaft body 1 are: The hinge assembly 202 is connected, and the hinge assembly 202 enables the flexible section 201 to swing along the extension direction of the blade 2. The axial direction of the shaft body 1 is also provided with: Through hole 101, in which the following is slidably provided: The slider 3 is provided on the outside of the shaft body 1 and is coaxially arranged with the shaft body 1: The air guide cover 4 moves along the axial direction of the shaft body 1 when the slider 3 slides along the through hole 101 .

[0023] When the propulsion system is in operation, when water flows through the blades 2, the blades 2 will deform according to the external force they are subjected to. Since the blades 2 are connected by the hinge assembly 202, the overall shape change is smoother and faster. When the external force decreases or disappears, the blades 2 gradually return to their original shape under the action of the memory metal until the external force is generated again. At the same time, the external force of the water flow on the deflector 4 will cause the slider 3 to slide along the through hole 101. At this time, the deflector 4 moves along the axial direction of the shaft body 1, which can not only cut aquatic plants but also adjust the angle of the deflector 4. Preferably, the hinge assembly 202 may be composed of a rotating shaft and a shaft sleeve, which are respectively arranged on the two flexible segments 201 so as to form a hinge between the two flexible segments 201 .

[0024] In one embodiment, the air guide cover 4 is composed of: At least two arc segments are spliced ​​together, each arc segment passing through: The traction rod 5 is connected to the slider 3 .

[0025] The air deflector 4 is set to a split structure, which is spliced ​​from two arc-shaped segments, which can make it easier to adjust the angle of the air deflector 4. The arc-shaped segment is connected to the slider 3 through the traction rod 5. When the slider 3 slides, the arc-shaped segment is directly pulled by the traction rod 5, thereby pulling the entire air deflector 4, and the transmission efficiency is higher.

[0026] Preferably, the shaft body 1 is further provided with a waist-shaped hole (not shown in the figure) for passing the traction rod 5 , and an elastic material is provided in the waist-shaped hole to wrap the traction rod 5 and fill the remaining space in the waist-shaped hole.

[0027] In one embodiment, it further includes: A hydraulic system (not shown) is connected to the shroud 4. When the ship speed or water depth changes, the relationship between the deployment angle of the shroud 4 and the ship speed and water depth is: ,in is the deployment angle of the air deflector 4, is the speed, For water depth.

[0028] The angle adjustment of the shroud 4 driven by the hydraulic system can more accurately control the angle of the shroud 4. When the shroud 4 is driven by the hydraulic system, the angle adjustment range of the shroud 4 is between 0°-45°, and its specific deployment angle is related to the ship speed and water depth. According to the above formula, when the ship speed is higher and the water depth is shallower, the deployment angle of the shroud 4 is larger; when the ship speed is lower and the water depth is deeper, the deployment angle of the shroud 4 is smaller.

[0029] In one embodiment, the inner side of the air guide cover 4 is provided with: There are at least two cutting pieces 6 , and the cutting pieces 6 are evenly distributed along the inner circumference of the air guide cover 4 .

[0030] The cutting piece 6 is provided to cut the waterweed in the radial direction of the shaft 1 to prevent it from affecting the rotation of the blade 2.

[0031] In one embodiment, the inner side of the air guide cover 4 is provided with: The accommodating groove is used to accommodate the cutting member 6.

[0032] By providing a receiving groove to accommodate the cutting member 6, the cutting member 6 can be stored in the receiving groove when the cutting member 6 is not needed, thereby preventing the cutting member 6 from being exposed and affecting the operation of the propeller.

[0033] In one embodiment, the through hole 101 is further provided with: The guide rod 102 , the slider 3 is sleeved on the guide rod 102 and slides along the guide rod 102 .

[0034] The guide rod 102 is provided to further guide the slider 3 , so that the slider 3 can slide more stably along the predetermined direction.

[0035] In one embodiment, it further includes: The optical detection module for sand content (not shown in the figure) is used to detect the sand content in the water flow. The rotation speed of the shaft 1 ,in is the rotation speed of shaft 1, is the sand content, For water depth, is the initial speed, is the initial water depth.

[0036] The sand content in the water flow is detected by the sand content optical detection module, and the rotation speed of the shaft 1 is adjusted according to the sand content. The corresponding rotation speed of the shaft 1 is adjusted in water bodies with different sand contents. When the sand content increases, the rotation speed is correspondingly reduced, and when the sand content decreases, the rotation speed is correspondingly increased.

[0037] In one embodiment, the pitch ratio is 0.6283.

[0038] The pitch ratio of a propeller is the ratio of the propeller's pitch to its diameter. It has a decisive influence on the propeller's thrust, efficiency, cavitation performance, and vibration characteristics. A low pitch ratio is suitable for low-speed, high-thrust demand scenarios (such as tugboats and tankers). It has greater thrust per unit speed and better efficiency at low speed and high load. In addition, the pressure distribution of a low pitch ratio is smooth and the cavitation tendency is low, which helps further reduce the generation of cavitation.

[0039] In one embodiment, the camber gradient ratio of the propeller is 5%-12%.

[0040] Where, the camber gradient ratio = ×100%; When a high camber gradient ratio is used, the efficiency at different radii of blade 2 can be improved, energy loss can be reduced, and the gradient ratio can be coordinated with the pressure gradient to slow down the generation of cavitation. However, a high camber gradient ratio may aggravate unsteady flow, induce periodic vortex shedding, and cause vibration and noise. When a low camber gradient ratio is used, the camber changes smoothly, the flow is more stable, and it is more suitable for low-speed or uniform flow field conditions. However, the lift distribution may not be able to adapt to complex flow fields (such as uneven wake), resulting in a decrease in propulsion efficiency. At the same time, a smooth change in camber can reduce the risk of low-pressure areas and reduce the tendency to cavitation. However, under high-load conditions, insufficient lift may cause the pressure on the back of blade 2 to be too low, which in turn induces cavitation. However, under a low camber gradient ratio, the flow is more uniform, the pressure pulsation is reduced, and vibration and noise can be effectively reduced.

[0041] Preferably, when the working conditions require: gentle camber change, stable flow, and low cavitation risk, the camber gradient ratio is 5%-8%; when the working conditions require: balanced lift distribution and flow separation control, the camber gradient ratio is 8%-10%; when the working conditions require: local lift concentration, the camber gradient ratio is 10%-12%; The relationship between each gradient ratio range and performance parameters is shown in Table 1. The comparison between the 7.5% gradient ratio and the 10.8% gradient ratio is shown in Table 2: Table 1: Relationship between each gradient ratio range and performance parameters Table 2: Comparison of 7.5% gradient ratio and 10.8% gradient ratio Among them, @0.7R means that the measurement distance is 0.7m, and the 7.5% gradient ratio is efficient and stable at 0.7m, which is suitable for uniform flow field; The 10.8% gradient ratio concentrates the lift at 0.85m, but at the expense of flow stability.

[0042] In one embodiment, the blade 2 is of MAU type.

[0043] In shallow water environments, the MAU type (Japan Ship Technology Association standard propeller) can reduce the slip rate and maintain high propulsion efficiency due to its low camber, and its medium disk ratio can avoid local water flow overload and reduce thrust fluctuations caused by shallow water effects.

[0044] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A propeller propulsion system for shallow channel ships, characterized by: include: The shaft body has an outer periphery provided with: A plurality of blades, the blades comprising: At least two flexible segments, each of which is made of memory metal and configured to deform with changes in water flow, with the following passing between each flexible segment and / or between the flexible segment and the shaft: The hinge assembly is connected, and the hinge assembly enables the flexible section to swing along the extension direction of the blade. The axial direction of the shaft body is also provided with: A through hole, wherein the through hole is slidably provided with: The outer side of the shaft body is also provided with a slider coaxially arranged with the shaft body: The air guide cover moves along the axial direction of the shaft body when the slider slides along the through hole.

2. The shallow channel ship propeller propulsion system according to claim 1, characterized in that: The deflector cover is composed of: At least two arc segments are spliced ​​together, each arc segment passing through: The traction rod is connected with the sliding block.

3. The shallow channel ship propeller propulsion system according to claim 2, characterized in that: Also includes: A hydraulic system is connected to the shroud. When the ship speed or water depth changes, the relationship between the deployment angle of the shroud and the ship speed and water depth is: ,in is the expansion angle of the shroud, is the speed, For water depth.

4. The shallow channel ship propeller propulsion system according to claim 1, characterized in that: The inner side of the deflector is provided with: There are at least two cutting pieces, and the cutting pieces are evenly distributed along the inner circumference of the air guide cover.

5. The propeller propulsion system for shallow channel ships according to claim 4, characterized in that: The inner side of the deflector is provided with: The accommodating groove is used to accommodate the cutting member.

6. The propeller propulsion system for shallow channel ships according to claim 1, characterized in that: The through hole is further provided with: The guide rod is sleeved on the slide block and slides along the guide rod.

7. The propeller propulsion system for shallow channel ships according to claim 1, characterized in that: Also includes: The optical detection module for sand content is used to detect the sand content in the water flow. The rotation speed of the shaft ,in is the shaft speed, is the sand content, For water depth, is the initial speed, is the initial water depth.

8. The propeller propulsion system for shallow channel ships according to claim 1, characterized in that: The pitch ratio is 0.6283.

9. The propeller propulsion system for shallow channel ships according to claim 1, characterized in that: The propeller's camber gradient ratio is 5%-12%.

10. The propeller propulsion system for shallow channel ships according to claim 1, characterized in that: The blade is of MAU type.

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