Pump jet propeller and aircraft

Abstract

The utility model discloses a pump jet thruster and an aircraft, and relates to the technical field of thrusters, the pump jet thruster comprises a guide pipe, a first stator, a rotor and a second stator are sequentially arranged in the guide pipe along the advancing direction of the pump jet thruster, and the rotor comprises a plurality of first blades arranged along the circumferential direction of the guide pipe; the first stator comprises a plurality of second blades arranged in the circumferential direction of the guide pipe, and the second stator comprises a plurality of third blades arranged in the circumferential direction of the guide pipe; a third blade enables water flow to rotate before passing through the third blade and entering the rotor, so that the inflow condition of the rotor is improved, and the propelling efficiency of the rotor is improved; the second blades can rectify the water flow flowing out of the rotor, so that the generation of vortexes is reduced, and the water flow resistance and the energy loss are reduced; according to the cavitation damage reducing assembly, the problem that the propelling efficiency of the pump-jet propeller is seriously reduced due to the fact that the pump-jet propeller generates much damage under the cavitation phenomenon is solved, and it is guaranteed that the aircraft adopting the pump-jet propeller has high propelling efficiency and reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of propellers, in particular to a pump-jet propeller and a navigation vehicle. Background Art

[0002] Cavitation refers to the phenomenon that when liquid flows inside the propeller, the local pressure drops below the saturated vapor pressure of the liquid due to excessive flow rate, thus forming bubbles. These bubbles will quickly collapse when the pressure is restored, generating strong shock waves and vibrations, leading to blade surface erosion, increased vibration and noise, and seriously reducing the performance and life of the propeller.

[0003] Therefore, how to reduce the damage caused by cavitation to the pump-jet propulsion system and improve the propulsion efficiency and reliability of the pump-jet propulsion system has become a technical problem that technical personnel in this field need to solve urgently. Utility Model Content

[0004] The utility model aims to provide a pump-jet propeller and a navigation vehicle, so as to reduce the damage of the pump-jet propeller caused by cavitation and improve the propulsion efficiency and reliability of the pump-jet propeller.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a pump-jet propeller, the pump-jet propeller comprises a conduit, a first stator, a rotor and a second stator are sequentially arranged in the conduit along the travel direction of the pump-jet propeller; the rotor comprises a plurality of first blades arranged along the circumference of the conduit, the first blades are rotatably arranged in the conduit, the first stator comprises a plurality of second blades arranged along the circumference of the conduit, the second stator comprises a plurality of third blades arranged along the circumference of the conduit, the second blades and the third blades are both fixed in the conduit;

[0007] At least one of the first blade, the second blade and the third blade is provided with a cavitation mitigation component;

[0008] Wherein, the cavitation damage reduction component can disturb the flow field, reduce low pressure areas and uneven flow;

[0009] And / or, the cavitation reduction assembly can reduce contact between water and the pump-jet propulsion system;

[0010] And / or, the cavitation damage reduction assembly can evenly distribute the pressure of the fluid on the pump-jet propulsor;

[0011] And / or, the cavitation damage reduction component can increase the strength of the pump-jet propulsor.

[0012] Preferably, the cavitation reduction component comprises a spoiler, the spoiler comprises a plurality of sawtooth groups arranged on the guide edge of the first blade, the sawtooth group comprises a plurality of first sawtooths arranged tangentially along the guide edge of the first blade.

[0013] Preferably, the tooth height of the first sawtooth is A, the chord length of the first blade is B, the tooth pitch of the first sawtooth is C, the tooth profile angle of the first sawtooth is D, the tooth root curvature radius of the first sawtooth is R, the diameter of the end of the conduit close to the first stator is E, and the diameter of the rotor is F;

[0014] Among them, A=0.6%~3.5%B; and / or, C=3A~9A; and / or, 25°≤D≤65°; and / or, 0.2A≤R≤0.6A; and / or, 0.90≤E / F≤0.98.

[0015] Preferably, the cavitation reduction component includes a pressure equalizing member, which includes a progressive transition fillet provided at the root of the first blade, and the curvature radius of the progressive transition fillet is G, G≥0.4A; and / or, the thickness of the first blade gradually decreases from the root of the first blade toward the tip of the first blade, at which time the pressure equalizing member includes the first blade.

[0016] Preferably, the root thickness of the first blade is H, the tip thickness of the first blade is I, and H=1.0I~1.7I.

[0017] Preferably, the cavitation reduction component includes a reinforcement member, wherein the reinforcement member includes a first reinforcement layer arranged at the root of the first sawtooth and along the principal stress direction of the first sawtooth; and / or the reinforcement member includes a second reinforcement layer, and the second reinforcement layer is arranged on at least one of the first blade, the second blade and the third blade.

[0018] Preferably, the second blade and the third blade are staggered.

[0019] Preferably, the sawtooth group includes a plurality of second sawtooths whose tooth height and / or tooth pitch and / or tooth angle gradually changes along the tangent direction of the guide edge of the first blade; and / or, the sawtooth group includes a plurality of sawtooth groups arranged in sequence along the thickness direction of the first blade.

[0020] Preferably, the cavitation damage reduction component includes a hydrophobic member, and the hydrophobic member includes a hydrophobic layer or an air vent, and the air vent is connected to an air supply source that supplies gas to the air vent.

[0021] In addition, the utility model also discloses an aircraft, which includes the above-mentioned pump-jet propulsion device.

[0022] Compared with the prior art, the utility model has achieved the following technical effects:

[0023] The pump-jet propeller of the utility model comprises a conduit, in which a first stator, a rotor and a second stator are sequentially arranged along the travel direction of the pump-jet propeller, the rotor comprises a plurality of first blades arranged along the circumference of the conduit, the first blades are movably arranged in the conduit, the first stator comprises a plurality of second blades arranged along the circumference of the conduit, the second stator comprises a plurality of third blades arranged along the circumference of the conduit, and the second blades and the third blades are both fixed in the conduit;

[0024] Because the third blade is arranged according to the working condition requirements, that is, the arrangement angle, curvature radius, chord length distribution and other structural parameters of the third blade are designed according to the working condition requirements, the water flow will rotate, i.e. pre-rotate, before entering the rotor after passing through the third blade (pre-rotation means that the water flow rotates before entering the rotor), which improves the inflow condition of the rotor, controls the entry direction and path of the water flow, and enables the water flow to flow to the rotor at the angle required by the rotor, thereby improving the propulsion efficiency of the rotor. At the same time, the second stator also reduces the radiation noise of the pump-jet propulsion system.

[0025] Because the first blade is rotatably arranged in the conduit, the water flow can be accelerated under the stirring of the first blade, and according to the interaction of forces, the accelerated water flow generates thrust for the aircraft using the utility model, pushing the aircraft forward, and because the second blade is arranged according to the working condition requirements, that is, the arrangement angle, curvature radius, chord length distribution and other structural parameters of the second blade are designed according to the working condition requirements, the second blade can rectify the water flow out of the rotor, so that the water flow flows more regularly and more smoothly, thereby reducing the generation of vortices, reducing water flow resistance and energy loss;

[0026] Furthermore, at least one of the first blade, the second blade and the third blade is provided with a cavitation damage reduction component; and because the cavitation damage reduction component can disturb the flow field, reduce low-pressure areas and uneven flow; and / or, the cavitation damage reduction component can reduce the contact between water and the pump-jet propeller; and / or, the cavitation damage reduction component can make the fluid evenly distributed on the pump-jet propeller; and / or, the cavitation damage reduction component can improve the strength of the pump-jet propeller; this reduces the problem of serious reduction in the propulsion efficiency of the pump-jet propeller due to more damage to the pump-jet propeller under cavitation, thereby ensuring that the aircraft using the pump-jet propeller in the utility model has higher propulsion efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a vehicle using the pump-jet propulsion system of the utility model;

[0029] Figure 2 It is a schematic diagram of the structure of a pump-jet propulsion system;

[0030] Figure 3 is a schematic diagram of the structure of the rotor;

[0031] Figure 4 is a schematic structural diagram of the first stator;

[0032] Figure 5 is a schematic structural diagram of the second stator;

[0033] Among them, 1. duct; 2. first blade; 3. second blade; 4. third blade; 5. first sawtooth; 6. pump-jet propeller; 7. hull module; 8. rotating shaft; 9. first propeller hub; 10. second propeller hub. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] like Figure 1~Figure 5As shown, the utility model discloses a pump-jet propeller 6 including a conduit 1, in which a first stator, a rotor and a second stator are sequentially arranged along the travel direction of the pump-jet propeller 6 in the conduit 1; the rotor includes a plurality of first blades 2 arranged along the circumference of the conduit 1, and the first blades 2 are movably arranged in the conduit 1; the first stator includes a plurality of second blades 3 arranged along the circumference of the conduit 1; the second stator includes a plurality of third blades 4 arranged along the circumference of the conduit 1, and the second blades 3 and the third blades 4 are both fixed in the conduit 1, and the second blades 3 and the third blades 4 are both arranged according to working conditions; at least one of the first blade 2, the second blade 3 and the third blade 4 is provided with a cavitation damage reduction component; wherein the cavitation damage reduction component can disturb the flow field, reduce low pressure areas and uneven flow; and / or, the cavitation damage reduction component can reduce the contact between water and the pump-jet propeller; and / or, the cavitation damage reduction component can make the fluid evenly distributed on the pump-jet propeller; and / or, the cavitation damage reduction component can improve the strength of the pump-jet propeller.

[0037] The pump-jet propeller 6 in the utility model comprises a conduit 1, in which a first stator, a rotor and a second stator are sequentially arranged along the travel direction of the pump-jet propeller 6, the rotor comprises a plurality of first blades 2 arranged along the circumference of the conduit 1, the first blades 2 are movably arranged in the conduit 1, the first stator comprises a plurality of second blades 3 arranged along the circumference of the conduit 1, the second stator comprises a plurality of third blades 4 arranged along the circumference of the conduit 1, and the second blades 3 and the third blades 4 are both fixed in the conduit 1;

[0038] Since the third blade 4 is arranged according to the working condition requirements, that is, the arrangement angle, curvature radius, chord length distribution and other structural parameters of the third blade 4 are designed according to the working condition requirements, the water flow will rotate, i.e., pre-rotate, before entering the rotor after passing through the third blade 4 (pre-rotation means that the water flow rotates before entering the rotor), which improves the inflow condition of the rotor, controls the inflow direction and path of the water flow, and enables the water flow to flow to the rotor at the angle required by the rotor, thereby improving the propulsion efficiency of the rotor. At the same time, the second stator also reduces the radiation noise of the pump-jet propulsor 6;

[0039] Because the first blade 2 is movably arranged in the conduit 1, the water flow can be accelerated under the stirring of the first blade 2, and according to the interaction of forces, the accelerated water flow generates thrust for the aircraft using the pump-jet propulsion device of the utility model, pushing the aircraft forward, and because the second blade 3 is arranged according to the working condition requirements, that is, the arrangement angle, curvature radius, chord length distribution and other structural parameters of the second blade 3 are designed according to the working condition requirements, the second blade 3 can rectify the water flow out of the rotor, so that the water flow flows more regularly and more smoothly, thereby reducing the generation of vortices, reducing water flow resistance and energy loss;

[0040] Furthermore, at least one of the first blade 2, the second blade 3 and the third blade 4 is provided with a cavitation damage reduction component; and because the cavitation damage reduction component can disturb the flow field, reduce low-pressure areas and uneven flow; and / or, the cavitation damage reduction component can reduce the contact between water and the pump-jet propeller; and / or, the cavitation damage reduction component can make the fluid evenly distributed on the pump-jet propeller; and / or, the cavitation damage reduction component can improve the strength of the pump-jet propeller; this reduces the problem of serious reduction in the propulsion efficiency of the pump-jet propeller 6 due to more damage to the pump-jet propeller 6 under the cavitation phenomenon, ensuring that the aircraft using the pump-jet propeller 6 in the utility model has higher propulsion efficiency and reliability, and can maintain good performance at both high and low speeds (at low speeds, the pump-jet propeller 6 can provide sufficient thrust to ensure stable navigation of the aircraft; at high speeds, the pump-jet propeller 6 can effectively reduce the damage to the pump-jet propeller 6 caused by cavitation and maintain efficient propulsion performance), so that the pump-jet propeller 6 has strong adaptability and can meet the use requirements under different working conditions.

[0041] The conduit 1 can be understood as a cover located outside the rotor, the first stator and the second stator. The two ends of the conduit 1 have a water inlet and a water outlet respectively. The conduit 1 can also be called an "annular fairing". When the conduit 1 is made of sound-absorbing and vibration-damping materials, the conduit 1 can also shield the huge noise generated by the operation of the rotor in the internal flow channel. The conduit 1 is an important component of the pump-jet propeller 6. Its main function is to guide the water flow through the pump-jet propeller 6. Figure 1 As shown, the cross section of the conduit 1 gradually decreases from the water inlet to the water outlet, which makes the water flow cross section continuously smaller, thereby realizing the acceleration of the water flow and enabling the water flow to flow along the axial direction of the conduit 1, thereby reducing the vortex and resistance of the water flow inside the pump-jet propeller 6, reducing energy loss, and improving the propulsion efficiency and the hydrodynamic performance of the pump-jet propeller 6. For the processing of the conduit 1, high-strength composite materials such as carbon fiber reinforced polyetheretherketone composite materials can be selected, the material is cut into the required size and shape as a blank, and the plate is rolled into a circular or elliptical tubular structure by a plate rolling machine, and then the interface is connected by welding or riveting, etc., and then the formed conduit 1 is machined by CNC processing equipment to ensure the dimensional accuracy and surface quality of the conduit 1 and meet the assembly requirements with other components. After the processing is completed, the conduit 1 is fully inspected, including dimensional accuracy inspection, shape inspection and surface quality inspection, etc. If defects or places that do not meet the design requirements are found, they are repaired and processed in time.

[0042] It should be noted that, according to the working conditions, the first stator, the rotor and the second stator can be equipped with corresponding hubs, such as Figure 2~Figure 5As shown, the first stator includes a first hub 9 and a plurality of second blades 3 arranged along the circumference of the first hub 9, the second stator includes a second hub 10 and a plurality of third blades 4 arranged along the circumference of the second hub 10, and the rotor includes a rotating shaft 8 and a plurality of first blades 2 arranged along the circumference of the rotating shaft 8. The first end of the second blade 3 is fixed to the first hub 9, and the second end of the second blade 3 is fixed to the inner wall of the duct 1; similarly, the two ends of the third blade 4 are respectively fixed to the second hub 10 and the inner wall of the duct 1, that is, the second blade 3 and the third blade 4 are fixedly installed blades. The first hub 9 and the second hub 10 are rotatably connected to the rotating shaft 8. The rotation of the rotor can be achieved by setting a drive assembly that is transmission-connected to the rotating shaft 8, and the drive assembly can be a rotating motor or other equipment that can drive the rotating shaft 8 to rotate. Alternatively, the hub may not be set, and the rotor is driven to rotate through the duct 1. In this case, the pump-jet propeller 6 is a shaftless pump-jet propeller.

[0043] When the first stator includes the second blade 3 and the first hub 9, and the second stator includes the third blade 4 and the second hub 10, aluminum alloy can be selected for the processing of the first stator and the second stator, and a blank can be made by a casting process. A corresponding casting mold is made, and the molten metal liquid is poured into the mold. After cooling and solidification, a blank is obtained. The cast blank is fully machined on a CNC machining center. The machining accuracy is strictly controlled during the machining process to ensure that the profile and angle of the second blade 3 and the third blade 4 meet the design requirements. After the machining is completed, various tests are performed on the front stator. If defects or machining errors are found, they are promptly repaired and adjusted to ensure that the quality meets the design standards.

[0044] When the rotor includes a rotating shaft 8 and a first blade 2, a CF / PEEK composite material, i.e., a carbon fiber reinforced polyetheretherketone composite material, with good fatigue resistance and cavitation corrosion resistance is selected for the processing of the rotor. Its fatigue resistance is 20% to 30% higher than that of traditional titanium alloys. The blank is forged into a preformed part close to the shape of the rotor through a forging process. The forging process strictly controls parameters such as forging temperature and forging ratio to improve the density and mechanical properties of the material. The preformed part after forging is rough-turned on a CNC lathe to remove most of the excess, and the shape of the rotor's journal, rotating shaft and other parts is initially formed, and then five-axis machining is used to process the preformed part. Axis linkage CNC machine tools, such as CNC milling machines, perform profiling milling on the first blade 2. For example, rough milling roughly outlines the outline of the first blade 2, and further semi-finishing the first blade 2 on the CNC milling machine to accurately process the profile, thickness and other dimensions of the first blade 2. At the same time, the shaft and the journal are further processed to improve their dimensional accuracy and surface quality. The first blade 2 is processed with the first sawtooth 5 by using a process such as electric spark machining. The curvature radius of the root of the first sawtooth 5 is controlled to 0.3~0.5 times the tooth height through electric spark machining; and plasma spraying Al is performed on the surface of the first blade 2. 2 O 3-TiO 2 A coating (thickness 50~100μm) is applied to enhance cavitation resistance; finally, a high-precision grinder is used to grind the rotor journal, shaft and first blade 2 to ensure that the dimensional accuracy and surface roughness of each part meet the design requirements, and the rotor is surface treated to improve its wear resistance and corrosion resistance.

[0045] like Figure 2 As shown, the second blade 3 and the third blade 4 are staggered. The staggered setting reduces the third blade 4 being periodically affected by the wake of the second blade 3 due to the alignment of the second blade 3 and the third blade 4, resulting in an increase in pulsating loads and aggravated blade fatigue damage; it reduces local pressure mutations and cavitation phenomena, and improves the durability of the pump-jet propulsor 6.

[0046] The cavitation damage reduction component of the utility model has a variety of settings. When the cavitation damage reduction component includes a spoiler, the cavitation damage reduction component can disturb the nearby flow field, reduce low-pressure areas and uneven flow; and / or, when the cavitation damage reduction component includes a hydrophobic component, the cavitation damage reduction component can reduce the contact between water and the pump-jet propeller; and / or, when the cavitation damage reduction component includes a pressure equalizing component, the cavitation damage reduction component can make the fluid evenly distributed on the pump-jet propeller; and / or, when the cavitation damage reduction component includes a reinforcing member, the cavitation damage reduction component can increase the strength of the pump-jet propeller. In short, the cavitation damage reduction component of the utility model does not only include a structure for reducing cavitation. Even if it cannot reduce cavitation, a structure that can reduce the damage of cavitation to the pump-jet propeller can also serve as a cavitation damage reduction component.

[0047] Specifically, when the cavitation reduction component includes a spoiler, the spoiler includes a plurality of sawtooth groups arranged on the leading edge of the first blade 2 , and the sawtooth groups include a plurality of first sawtooths 5 arranged tangentially along the leading edge of the first blade 2 .

[0048] The guide edge refers to the leading edge of the first blade 2 when it pushes the aircraft using the present invention forward, that is, when the rotor is rotating forward (forward rotation refers to the direction of rotation of the rotor when the aircraft using the pump-jet propeller 6 of the present invention is moving normally), the edge of the first blade 2 is on the front side, that is, the side of the first blade 2 that first contacts the water. The first sawtooth 5 can not only suppress cavitation, but also optimize propulsion efficiency and reduce noise: the first sawtooth 5 discretizes the continuous vortex at the leading edge of the guide edge of the first blade 2, significantly reducing the vortex energy density, and then suppressing the generation of cavitation; and the tooth tip of the first sawtooth 5 can induce a local high-pressure area, and the tooth valley forms a low-pressure buffer zone, delaying fluid separation, avoiding the formation of an extreme low-pressure area, and increasing the cavitation threshold pressure by 15% to 25%.

[0049] The geometric parameter design of the first sawtooth 5 is the key to the first sawtooth 5 realizing the above functions. The first sawtooth 5 is set based on the proportional relationship between the boundary layer thickness and the chord length to ensure that the disturbance of the first sawtooth 5 can effectively penetrate the boundary layer. The tooth height of the first sawtooth 5 is A, the chord length of the first blade 2 is B, the tooth pitch of the first sawtooth 5 is C, the tooth profile angle of the first sawtooth 5 is D, the tooth root curvature radius of the first sawtooth 5 is R, the diameter of the conduit 1 close to the first stator end is E, and the diameter of the rotor is F; wherein, A=0.6%~3.5%B, specifically, A=0.8%~3%B; and / or, C=3A~9A, specifically, C=4A~8A, preferably C=6A; and / or, 25°≤D≤65°, specifically, 35°≤D≤55°; and / or, 0.2A≤R≤0.6A, specifically, 0.3A≤R≤0.5A, to avoid stress concentration; and / or, 0.90≤E / F≤0.98, to accelerate the uniformity of the flow field and avoid flow separation at the first sawtooth 5, specifically, 0.92≤E / F≤0.96.

[0050] Alternatively, the sawtooth group includes a plurality of second sawtooths whose tooth height and / or tooth pitch and / or tooth angle gradually change along the tangent direction of the leading edge of the first blade 2; this makes the fluid load evenly distributed, avoids the second sawtooth of a single size from being subjected to excessive local stress, and improves the fatigue resistance of the second sawtooth; makes the disturbance generated when the fluid passes through the second sawtooth relatively gentle, reduces the shear force impact caused by the sudden change of the shape of the first blade 2, reduces the risk of damage to the second sawtooth and the first blade 2, and the smaller second sawtooth reduces fluid adhesion, improves flow stability, and reduces the invasion of the second sawtooth during cavitation collapse. Erosion; and / or, the sawtooth group includes a plurality of sawtooth groups arranged in sequence along the thickness direction of the first blade 2, which is equivalent to providing the first sawtooth 5 in a larger area of ​​the first blade 2, which disperses the shear stress on the sawtooth group, reduces the force on a single first sawtooth 5, and reduces local fatigue damage; and since the sawtooth groups are located at different thickness positions of the first blade 2, the bending stiffness of the first blade 2 can be effectively increased, and the impact resistance can be improved; different sawtooth groups can perform graded disturbances on the fluid, making the flow more stable, reducing the impact of turbulence on the first blade 2, thereby reducing the first vibration and deformation of the blade.

[0051] Furthermore, the first serration 5 may not be provided, and grooves or protrusions in shapes other than serrations may be provided on the first blade and / or the second blade and / or the third blade. For example, grooves or protrusions may be provided on the blades of the second stator near the tip area to suppress tip vortex cavitation; or strip protrusions or grooves may be provided along the entire span direction of the blade (the span direction refers to the direction from the blade tip to the blade root) upstream of the maximum cavitation length of the first blade and / or the second blade and / or the third blade to suppress cloud cavitation.

[0052] When the cavitation damage reduction component includes a pressure equalizing member, the pressure equalizing member includes a progressive transition fillet provided at the root of the first blade 2, and the curvature radius of the progressive transition fillet is G, G≥0.4A, and more precisely, the value range of G is G≥0.5A. By setting a progressive transition fillet, the problem of the first sawtooth 5 being easily damaged due to stress concentration at the root of the first sawtooth 5 due to the sudden change in shape at the root of the first blade 5 is reduced. And / or, the thickness of the first blade 2 gradually decreases from the root of the first blade 2 to the tip of the first blade 2. At this time, the pressure equalizing member includes the first blade 2. The root thickness of the first blade 2 is H, and the tip thickness of the first blade 2 is I, H=1.0I~1.7I, specifically, H=1.2I~1.5I. By increasing the thickness of the high-pressure area of ​​the first blade 2, the pressure can be evenly distributed on the first blade 2, reducing the damage to the first sawtooth 5 and the first blade 2 caused by cavitation.

[0053] When the cavitation damage reduction component includes a reinforcement, the reinforcement includes a first reinforcement layer arranged at the root of the first sawtooth 5 and arranged along the principal stress direction of the first sawtooth 5. The first reinforcement layer can be a carbon fiber reinforcement layer, which is distributed along the principal stress direction of the first sawtooth 5. Compared with the traditional carbon alloy layer, the carbon fiber reinforcement layer increases the fatigue strength of the first sawtooth 5 by 20% to 30%, so as to improve the fatigue resistance of the first sawtooth 5 and make the first sawtooth 5 less prone to damage. And / or, the reinforcement includes a second reinforcement layer, which is arranged on at least one of the first blade 2, the second blade 3 and the third blade 4; the second reinforcement layer can be made of a material such as a carbon fiber reinforced polyetheretherketone composite material that can improve the impact resistance and fatigue resistance. To facilitate understanding of the setting position of the second reinforcement layer, the setting position of the second reinforcement layer is explained. When the second reinforcement layer is only arranged on the first blade 2, the second reinforcement layer is a reinforcement material layer coated on the outer surface of the first blade.

[0054] When rotating at high speed, the first blade 2 will be subjected to large centrifugal force and water pressure, and is prone to vibration. The first reinforcement layer increases the surface area and thickness of the first blade 2, effectively improves the rigidity of the first blade 2, reduces vibration, and at the same time, reduces noise, thereby improving the concealment and comfort of the pump-jet propeller 6 (comfort means reducing noise).

[0055] When the cavitation damage reduction component includes a hydrophobic component, the hydrophobic component includes a hydrophobic layer, and the hydrophobic layer is made of a super-hydrophobic material such as a super-hydrophobic cellulose-based material. The hydrophobic layer reduces the contact between water and the blade surface, making it easier for cavitation bubbles to detach from the surface, reducing cavitation damage, or the flexibility of the polymer material on the super-hydrophobic surface weakens the damage of the pump-jet propeller 6 caused by the cavitation shock wave; and / or, the hydrophobic component includes an air vent, and an air supply source connected to the air vent, the air supply source can supply gas to the air vent, so that an air film is formed at the air vent, reducing the contact between the liquid and the blade, thereby reducing the damage to the blade caused by cavitation; the air supply source includes a gas storage tank storing required gas, and a delivery pump that delivers the gas in the gas storage tank to the air vent, and the delivery pump is arranged on a pipe connecting the gas storage tank and the air vent.

[0056] It should be noted that the structures of the spoiler, the hydrophobic member, the pressure equalizing member and the reinforcement are not limited to the above-mentioned forms, and the structures that can achieve the above-mentioned functions of the spoiler, the hydrophobic member, the pressure equalizing member and the reinforcement can also be used as the spoiler, the hydrophobic member, the pressure equalizing member and the reinforcement respectively. The spoiler, the hydrophobic member, the pressure equalizing member and the reinforcement are mostly described in the form of being arranged on the first blade 2. The spoiler, the hydrophobic member, the pressure equalizing member and the reinforcement can also be arranged on the second blade 3 and the third blade 4. If the working conditions permit, they can also be arranged on the inner wall of the conduit 1; and when the first blade 2 is provided with one or more structures of the spoiler, the hydrophobic member, the pressure equalizing member and the reinforcement, it is necessary to pay attention to the avoidance arrangement to ensure that the respective functions can be smoothly realized.

[0057] As can be seen from the above, the pump-jet propeller 6 in the utility model can maintain good performance at both high and low speeds, has the advantages of high efficiency, low noise, high reliability and long life, and is suitable for various underwater vehicles.

[0058] In addition, the utility model also discloses a vehicle including the above-mentioned pump-jet propeller 6, the vehicle adopts the above-mentioned pump-jet propeller 6, the vehicle includes a hull module 7, and the hull module 7 plays a key role in many aspects in the overall design and function realization. The vehicle refers to a device that can sail on water and / or underwater. The hull module 7 provides a basis for installation and fixation of the pump-jet propeller 6 and other related components. It ensures that the duct 1, the rotor, the first stator, the second stator and other components can be stably installed to maintain their relative positions and structural integrity. This stable support structure is a prerequisite for the normal operation of the propulsion system, avoiding problems such as vibration, increased noise or performance degradation caused by unstable installation. The hull module 7 selects high-strength aluminum alloy, optimizes the structure of the hull module 7, and analyzes its stress distribution, deformation and the like under different loads and working conditions to ensure the rationality and reliability of the structure. The cut aluminum alloy plates are spliced ​​into the hull module 7 by welding, riveting and other processes. Appropriate welding methods and parameters should be used during welding to ensure the quality and strength of the weld. The dimensional accuracy and surface roughness requirements should be guaranteed during processing. According to the use environment and requirements, the surface of the hull module 7 is coated for protection to improve the corrosion resistance and anti-fouling ability of the hull.

[0059] In the present utility model, "and / or" means that the text content before "and" and "or" and the text content after "and" and "or" can exist at the same time or separately; for example, "A and / or B" includes the situation where only A or B exists, and the situation where both A and B exist at the same time.

[0060] The utility model discloses multiple technical solutions, but does not provide any contrary technical inspiration.

[0061] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A pump-jet propulsion system, characterized in that: The pump-jet propeller comprises a conduit, in which a first stator, a rotor and a second stator are sequentially arranged along the travel direction of the pump-jet propeller; the rotor comprises a plurality of first blades arranged along the circumference of the conduit, the first blades are rotatably arranged in the conduit, the first stator comprises a plurality of second blades arranged along the circumference of the conduit, the second stator comprises a plurality of third blades arranged along the circumference of the conduit, and the second blades and the third blades are both fixed in the conduit; At least one of the first blade, the second blade and the third blade is provided with a cavitation mitigation component; Wherein, the cavitation damage reduction component can disturb the flow field, reduce low pressure areas and uneven flow; And / or, the cavitation reduction assembly can reduce contact between water and the pump-jet propulsion system; And / or, the cavitation damage reduction assembly can evenly distribute the pressure of the fluid on the pump-jet propulsor; And / or, the cavitation damage reduction assembly can improve the strength of the pump-jet propulsor; The cavitation damage reduction assembly includes a spoiler, the spoiler includes a plurality of sawtooth groups arranged on the guide edge of the first blade, the sawtooth group includes a plurality of first sawtooths arranged tangentially along the guide edge of the first blade; The tooth height of the first sawtooth is A, the chord length of the first blade is B, the tooth pitch of the first sawtooth is C, the tooth profile angle of the first sawtooth is D, the tooth root curvature radius of the first sawtooth is R, the diameter of the end of the conduit close to the first stator is E, and the diameter of the rotor is F; Among them, A=0.6%~3.5%B; and / or, C=3A~9A; and / or, 25°≤D≤65°; and / or, 0.2A≤R≤0.6A; and / or, 0.90≤E / F≤0.

98.

2. The pump-jet propeller according to claim 1, characterized in that: The cavitation reduction component includes a pressure equalizing member, which includes a progressive transition fillet provided at the tooth root of the first blade, and the curvature radius of the progressive transition fillet is G, G≥0.4A; and / or, the thickness of the first blade gradually decreases from the root of the first blade toward the tip of the first blade, and at this time the pressure equalizing member includes the first blade.

3. The pump-jet propeller according to claim 2, characterized in that: The root thickness of the first blade is H, the tip thickness of the first blade is I, and H=1.0I~1.7I.

4. The pump-jet propeller according to claim 1, characterized in that: The cavitation damage reduction component includes a reinforcement member, wherein the reinforcement member includes a first reinforcement layer arranged at the root of the first sawtooth and arranged along the principal stress direction of the first sawtooth; and / or the reinforcement member includes a second reinforcement layer, and the second reinforcement layer is arranged on at least one of the first blade, the second blade and the third blade.

5. The pump-jet propeller according to claim 1, characterized in that: The second blade and the third blade are staggered.

6. The pump-jet propeller according to claim 1, characterized in that: The sawtooth group includes a plurality of second sawtooths whose tooth height and / or tooth pitch and / or tooth angle gradually changes along the tangent direction of the guide edge of the first blade; and / or, the sawtooth group includes a plurality of the sawtooth groups arranged in sequence along the thickness direction of the first blade.

7. The pump-jet propeller according to claim 1, characterized in that: The cavitation damage reduction component includes a hydrophobic component, and the hydrophobic component includes a hydrophobic layer or an air vent. The air vent is connected to an air supply source that supplies gas to the air vent.

8. An aircraft, characterized in that: The aircraft comprises the pump-jet propulsion system according to any one of claims 1 to 7.

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