Navigation propeller

Abstract

The sailing propeller comprises a motor and a propeller, the motor comprises a rotor assembly and a stator assembly, the rotor assembly comprises a hollow rotor shaft, fluid passes through the rotor shaft, and a rotor iron core and a permanent magnet are installed on the outer side of the rotor shaft; the stator assembly comprises a motor shell, a coil, a sensor group and a wire harness group, the shell sleeves the outer side of the rotor shaft in a clearance manner, and the coil is close to the rotor iron core and the permanent magnet. The propeller is installed at the front end of the rotor shaft, the propeller is of an inner-outer double-propeller structure, an outer-shaft propeller is arranged on the outer side of the rotor shaft, and an inner-shaft propeller is arranged in a hollow part of the rotor shaft. According to the utility model, the propulsive force is improved, the water flow distribution and the velocity field are also improved, and the noise is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to propeller technical field especially relates to a rotor shaft motor propeller, be applicable to underwater or aerial vehicle. BACKGROUND

[0002] In underwater or aerial navigation propulsion system, the structure of motor and propeller separation is mostly adopted, relies on long transmission shaft to realize power transmission, and the traditional architecture causes a large amount of energy loss due to the inertia of shaft rotation in long transmission shaft operation process, and is unstable.In addition, long transmission shaft and other key transmission components are easily affected by factors such as wear and corrosion during long-term operation, and need to be replaced and maintained regularly, so the operation cost of equipment is high.The complexity of structure also constitutes a serious obstacle to the optimized use and miniaturized design of the internal space of the vehicle.

[0003] Therefore, it is necessary to develop a new propeller with compact structure, high efficiency, energy saving, low noise and convenient maintenance. SUMMARY

[0004] In view of the background problem, the utility model provides a kind of propeller, which is designed with rotor shaft, realizes shaft internal flow, assists double propeller rotation, improves propelling force, effectively improves power transmission efficiency, significantly reduces energy loss and operating noise, and also realizes compact structure and light weight, meets the urgent needs of underwater vehicles, aerial vehicles and other various equipment for high-performance propulsion systems.

[0005] The technical scheme of the utility model is: a navigation propeller, comprising a motor and a propeller, the motor comprises a rotor assembly and a stator assembly, characterized by:

[0006] The rotor assembly comprises a hollow rotor shaft, the rotor shaft is passed through by fluid, and a rotor core and a permanent magnet are installed outside the rotor shaft;

[0007] The stator assembly comprises a motor housing, a coil, a sensor group and a wire harness group, the motor housing is gapingly sleeved outside the rotor shaft, the coil is fixed in the inner cavity of the motor housing and is close to the rotor core and the permanent magnet.

[0008] Further, the outer surface of the rotor shaft is provided with a plurality of honeycomb-shaped grooves, each of the grooves is embedded with a heat-conducting column, the rotor core is sleeved outside the heat-conducting column, and the permanent magnet is installed on the outer circumferential surface of the rotor core.

[0009] Further, a heat-dissipating spiral ring is installed inside the rotor shaft, and the position of the heat-dissipating spiral ring corresponds to the heat-conducting column.

[0010] Further, the motor further comprises an end cover assembly for supporting and sealing the rotor assembly and the stator assembly;

[0011] The end cover assembly comprises an end cover, a housing, a bearing, a magnetic fluid sealing system, a small end cover, a skeleton seal and an end cap; wherein the end cover end face is tightly engaged with the motor housing end face, and the end cover is radially sealedly engaged with the rotor shaft through the bearing and the magnetic fluid sealing system;

[0012] The housing is fixedly connected with the end cover, and the bearing, the magnetic fluid sealing system, the small end cover and the skeleton seal are enveloped therein;

[0013] The small end cover and the skeleton seal seal the magnetic fluid sealing system; and the end cap is assembled outside the connection between the housing and the end cover to protect the fasteners.

[0014] Further, the propeller is fixedly installed at the front end of the rotor shaft, and the propeller adopts an inner-outer dual propeller structure. The propeller comprises an outer shaft propeller and an inner shaft propeller; the outer shaft propeller is arranged outside the rotor shaft, and the inner shaft propeller is arranged inside the rotor shaft.

[0015] The hollow rotor shaft motor + propeller form is adopted, the propeller is installed at the front end of the rotor shaft, the rotor shaft drives, the rotation thrust of the propeller is relied on to push the machine body forward, meanwhile, the fluid can pass through the hollow rotor shaft, the propulsion efficiency can be effectively improved, the jet thrust is formed by the water flow in the shaft through the inner shaft propeller, the jet propulsion can reduce the cavitation phenomenon, reduce the energy loss, and reduce the propulsion noise. Hollowing of the rotor shaft can reduce the moment of inertia during rotation to make the structure more stable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structure schematic diagram of the propeller (wherein the motor part is a sectional view);

[0017] Figure 2 is a rotor assembly schematic diagram;

[0018] Figure 3 is a stator assembly schematic diagram;

[0019] Figure 4 is an end cover assembly schematic diagram;

[0020] Figure 5 is a shaftless propeller-outer shaft propeller structure schematic diagram;

[0021] Figure 6 is a pump propeller-outer shaft propeller structure schematic diagram. DETAILED DESCRIPTION

[0022] The utility model is described in detail below in combination with the drawings and embodiments, and those skilled in the art should know that the following embodiments are not the only limitation on the technical scheme of the utility model, and any equivalent transformation or change within the spirit and essence of the technical scheme of the utility model should be regarded as falling within the protection scope of the utility model.

[0023] The utility model provides a rotor shaft motor navigation propeller, including motor and propeller two parts, propeller is installed in the rotor shaft front end of motor, rotates together with rotor shaft.

[0024] As Figure 1 Indicated, the motor part includes rotor assembly 11 and stator assembly 12 two parts in the utility model, and stator assembly 12 is assembled around the periphery of rotor assembly 11, and the both make the rotor rotate through electromagnetic induction, forms motor power part.

[0025] As Figure 2 Indicated, rotor assembly 11 includes: rotor shaft 111, rotor core 112, permanent magnet 113 and positioning sleeve 114.

[0026] Rotor shaft 111 is located at the center position of the whole motor system, and other components are assembled with this as the axis, and rotor shaft is similar to the shape of circular tube, has the basic characteristics of shaft, such as stepped shaft and the structure for positioning shoulder and groove.

[0027] Rotor core 112 is sleeved on the periphery of rotor shaft 111, is used for providing magnetic circuit passage, and permanent magnet 113 surface is sleeved or embedded on rotor core 112, is used for providing permanent magnet power.The positioning sleeve 114 is sleeved on the periphery of rotor shaft 111 for positioning rotor core 112.Rotor shaft 111, rotor core 112, permanent magnet 113 and positioning sleeve 114 are relatively fixed to form an integral whole.

[0028] Further, heat conduction column 115 is further provided on rotor shaft 111, and heat conduction column 115 is used for conducting the heat generated by rotor core 112 and permanent magnet 113, and is beneficial to motor heat dissipation.The specific mode is that a plurality of honeycomb-shaped grooves are arranged in the axial range of the outer surface of rotor shaft 111, heat conduction column 115 is embedded in each groove, rotor core 112 is sleeved on the outer side of the rotor shaft in the part where heat conduction column 115 is embedded, for assisting the cooling of rotor core and permanent magnet, and the material of heat conduction column can be selected from copper, aluminum and the like.

[0029] In this invention, the rotor shaft 111 adopts a hollow shaft design to allow fluid (water or air) to flow through the shaft hole. For a propeller, a hollow shaft is beneficial for propelling the fluid. Furthermore, this structure can reduce weight while maintaining strength, lower rotational inertia, resulting in faster motor response and reduced energy loss. Additionally, the hollow shaft design allows for a streamlined design to adapt to fluid characteristics, facilitating fluid flow and the installation of heat dissipation structures.

[0030] Therefore, a heat dissipation spiral ring 116 is further provided inside the rotor shaft 111. The heat dissipation spiral ring 116 is snapped onto the inner wall of the rotor shaft 111, corresponding to the position of the heat-conducting column 115. The heat dissipation spiral ring 116 is used to conduct heat to the heat-conducting column 115. The heat dissipation spiral ring 116 rotates with the rotor shaft, and the fluid is agitated in the spiral ring, making the fluid flow rate faster and enhancing the heat dissipation effect. Moreover, because of its spiral ring shape, the contact area with the fluid is increased, which also improves the heat dissipation efficiency. On the other hand, the heat dissipation spiral ring is driven to rotate by the rotor shaft, generating a spiral thrust on the fluid, which also accelerates the propulsion of the fluid and promotes the propulsion effect.

[0031] Furthermore, the heat dissipation spiral ring 116 is installed inside the rotor shaft. One end is blocked by the internal shoulder of the rotor shaft 111, and the other end can be positioned by the positioning sleeve 117. The positioning sleeve 117 is screwed into the rotor shaft, which plays the role of positioning the heat dissipation spiral ring and protecting the internal structure.

[0032] In this invention, the rotor shaft 111 and the heat dissipation spiral ring 116 can be made of corrosion-resistant materials such as stainless steel, nickel-copper alloy, titanium alloy, austenitic stainless steel and carbon fiber composite material.

[0033] In this invention, the rotor shaft 111 adopts a hollow design strategy. After testing and verification, the ratio of the inner diameter to the thickness of the designed rotor shaft is 0.15-0.35, which is considered good.

[0034] like Figure 3 As shown, the stator assembly 12 includes: a motor housing 121, a coil 122, a sensor group 123, and a wiring harness group 124. The stator assembly 12 is intermittently fitted onto the outside of the rotor assembly 11, and its position corresponds to the rotor core 112 and the permanent magnet 113.

[0035] The motor housing 121 serves as a basic support structure, providing physical housing space and mechanical protection for the entire motor stator system. The motor housing 121 has a central shaft hole and is intermittently fitted onto the outside of the rotor shaft 111.

[0036] The coil 122 is fixed inside the motor housing 121, close to the rotor core 112 and permanent magnet 113 of the rotor assembly, and is a key component for the motor to achieve electromagnetic conversion. The sensor group 123 is arranged in a suitable position inside the motor housing 121 to monitor relevant parameters during motor operation, such as temperature, humidity, Hall effect signals, and magnetic field strength. Since the motor stator assembly is a stationary component, arranging the sensors near the axial axis and magnetic field allows for accurate detection of the central shaft speed, the temperature rise of the rotor system due to movement, and the magnetic field strength. The wiring harness 124 connects the coil 122 and sensor group 123, transmitting electrical energy and signals. One end connects to the relevant electrical components, and the other end extends out of the motor housing 121 to connect to an external control system or power supply.

[0037] When the coil 122 of the stator assembly 12 is energized, it generates current, which in turn generates electromagnetic induction with the rotor core 112 and the permanent magnet 113. That is, the motor stator assembly and the rotor assembly work together to achieve electromagnetic power function. The rotor core 112 and the permanent magnet 113 generate force under the magnetic field, which in turn drives the rotor shaft to rotate.

[0038] Furthermore, the motor part also includes end cover assemblies 13, which are respectively installed at both ends of the stator assembly, and play a supporting and sealing role for the motor stator and rotor.

[0039] The basic structural form of end cap assembly 13 is as follows: Figure 4 As shown, it includes: end cap 131, housing 132, bearing 133, magnetohydrodynamic sealing system 134, small end cap 135, skeleton seal 136, and end cap 137.

[0040] End cover 131 serves as the mounting base for the left-end assembly of the motor, and is directly or indirectly connected to housing 132, bearing 133, magnetohydrodynamic sealing system 134, small end cover 135, skeleton seal 136, and left end cap 137. End cover 131 is radially and tightly engaged with rotor shaft 111 through bearing 133 and magnetohydrodynamic sealing system 134. End cover 131 is axially fixedly connected to housing 132 through bolts and other connecting parts, and is also connected to motor housing 121 through bolts and other connecting parts.

[0041] The housing 132 encloses the end cap 131, bearing 133, magnetohydrodynamic sealing system 134, small end cap 135, and skeleton seal 136, providing external protection and connection interface for the entire system.

[0042] The bearing 133 is installed in the inner cavity of the end cover 131 and is axially sealed to the rotor shaft 111. It is used to support the rotor shaft 111, ensure the stability and accuracy of the component during rotation, and enable the shaft to rotate smoothly.

[0043] The magnetohydrodynamic (MHD) sealing system 134 is installed at a suitable position within the inner cavity of the end cover 131. It utilizes the properties of MHD to achieve dynamic sealing, preventing internal media leakage and the ingress of external impurities. The MHD sealing system 134 consists of a magnetohydrodynamic fluid, a permanent magnet, and pole shoes. The magnetic fluid is injected into the gap of the magnetic circuit formed by the high-performance permanent magnet, the highly conductive pole shoes, and the rotor shaft. Under the influence of the magnetic field, the MHD forms several liquid O-rings within the gap. When subjected to a pressure difference, the MHD moves slightly in the non-uniform magnetic field, generating a magnetic force that counteracts the pressure difference, thereby achieving a new equilibrium and providing a seal. Centrifugal MHD sealing is even more effective in this invention.

[0044] The small end cap 135, relying on the skeleton seal 136, is tightly attached to the outside of the magnetic fluid sealing system 134, further fixing and protecting the magnetic fluid sealing system, and playing a role in sealing and positioning.

[0045] The skeleton seal 136 is fastened to the rotor shaft 111 and pressed tightly against the outside of the small end cover 135. As an auxiliary sealing device, it enhances the sealing effect and prevents fluid leakage.

[0046] End cap 137 is fitted on the outside of the connection between housing 132 and end cover 131, serving to protect the fasteners and also reduce fluid resistance.

[0047] The propeller system is installed at the front end of the rotor shaft 111 and provides propulsion.

[0048] Furthermore, this utility model adopts a dual-propeller combined structure, such as... Figure 5 and Figure 6 As shown, the propeller system consists of two parts: an external propeller 21 and an internal propeller 22. The external propeller 21 is located outside the rotor shaft, and the internal propeller 22 is located inside the rotor shaft. Because this motor adopts a hollow shaft strategy, it provides convenient conditions for the design of a dual-propeller system.

[0049] The outer propeller 21 and the inner propeller 22 together form a propeller system, which is fixedly installed at the front end of the rotor shaft by any feasible means (such as key connection, interference fit, etc.).

[0050] Furthermore, the internal propeller of this invention can be of two types: shaftless propeller and pump-thrust propeller. Figure 5 It is a shaftless propeller type. Figure 6 It is a pump-paddle type.

[0051] The blades of the shaftless propeller are streamlined to reduce turbulence and are fixed by an external support structure (i.e., the propeller shaft). Without a traditional hub, the absence of a central shaft reduces fluid resistance, improves propulsion efficiency, and lowers noise.

[0052] The difference between a pump propeller and a shaftless propeller is that the pump propeller has a hub. The pump propeller is similar to the impeller of an axial flow pump, with wide blades and a curved surface design to improve thrust efficiency. The pump propeller has an outer shaft and inner blades. The outer shaft is the rotor shaft and has a streamlined hub to reduce resistance and improve propulsion efficiency. The blades are mounted on the outer shaft and the hub, and together they bear the hydrodynamic load.

[0053] This invention employs a dual-propeller design, effectively improving propulsion efficiency and reducing propulsion noise. The outer propeller primarily generates thrust through blade rotation, while the inner propeller generates jet thrust through water flow within the shaft. The combination of these two components enhances overall propulsion efficiency. During high-speed navigation, jet propulsion reduces cavitation, minimizes energy loss, and improves propulsion performance.

[0054] Therefore, in general, this utility model adopts a hollow shaft motor design. When fluid passes through the shaft hole, the fluid is accelerated, and the conversion method of its kinetic and pressure energy changes, causing pressure energy to be converted into kinetic energy (Bernoulli's principle), thereby enhancing the propulsion effect. Simultaneously, when the propeller rotates, it exerts a force on the surrounding fluid, causing it to rotate. As the fluid flows through the shaft hole, some fluid flows axially due to the presence of the shaft hole. This axially flowing fluid, combined with the fluid propelled by the external propeller blades, can alter the overall fluid distribution and velocity field to a certain extent. The presence of the shaft hole reduces energy loss caused by turbulence and boundary layer separation during propeller operation. Driven by the motor system, the inner and outer propellers of the dual-propeller system rotate synchronously at high speed, propelling the fluid and generating a reaction force according to Newton's third law, providing thrust enhancement for the equipment in forward or other directions.

Claims

1. A propulsion device comprising a motor and a propeller, wherein the motor comprises a rotor assembly (11) and a stator assembly (12), characterized in that: The rotor assembly (11) includes a hollow rotor shaft (111) through which fluid flows, and a rotor core (112) and a permanent magnet (113) are mounted on the outside of the rotor shaft (111). The stator assembly (12) includes a motor housing (121), a coil (122), a sensor group (123), and a wire harness group (124). The motor housing (121) is intermittently sleeved on the outside of the rotor shaft (111). The coil (122) is fixed in the inner cavity of the motor housing (121) and is close to the rotor core (112) and the permanent magnet (113).

2. The propulsion device according to claim 1, characterized in that: The outer surface of the rotor shaft (111) is provided with a plurality of honeycomb-shaped slots, and a heat-conducting column (115) is embedded in each slot. The rotor core (112) is fitted on the outside of the heat-conducting column (115), and the permanent magnet (113) is installed on the outer circumferential surface of the rotor core (112).

3. The propulsion device according to claim 1 or 2, characterized in that: A heat dissipation spiral ring (116) is installed inside the rotor shaft (111), and the position of the heat dissipation spiral ring (116) corresponds to the heat conduction column (115).

4. The propulsion device according to claim 1, characterized in that: The motor also includes an end cover assembly (13) for supporting and sealing the rotor assembly (11) and the stator assembly (12); The end cap assembly (13) includes: an end cap (131), a housing (132), a bearing (133), a magnetohydrodynamic sealing system (134), a small end cap (135), a skeleton seal (136), and an end cap (137). Among them, the end face of the end cover (131) is tightly joined to the end face of the motor housing (121), and the end cover (131) is radially joined to the rotor shaft (111) through the bearing (133) and the magnetic fluid sealing system (134); The housing (132) is fixedly connected to the end cap (131), enclosing the bearing (133), the magnetohydrodynamic sealing system (134), the small end cap (135), and the skeleton seal (136) inside; The small end cap (135) and the skeleton seal (136) seal the magnetohydrodynamic sealing system (134); An end cap (137) is fitted on the outside of the connection between the housing (132) and the end cover (131) to protect the fastener.

5. The propulsion device according to claim 1, characterized in that: The propeller is fixedly installed at the front end of the rotor shaft (111), and the propeller adopts an inner and outer double propeller structure.

6. The propulsion device according to claim 1 or 5, characterized in that: The propeller includes an outer propeller (21) and an inner propeller (22); the outer propeller (21) is located on the outside of the rotor shaft (111), and the inner propeller (22) is located on the inside of the rotor shaft (111).

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