CN212389659U - Annular electric propeller supported by liquid suspension bearing - Google Patents

Abstract

The utility model relates to an annular electric power propeller that liquid suspension bearing supported, include: the propeller comprises a shell, a rim type motor, a liquid suspension bearing system and a propeller. The utility model discloses a arrange the permanent magnet brushless motor of aquatic in and directly drive no hub formula screw and rotate, saved middle transmission equipment, rotor and screw subassembly are supported by the liquid suspension bearing and on transmitting motor and hull with thrust, reduce the middle transmission loss between motor to the screw, raise the efficiency, simplify propulsion system structure, reduce noise and vibration etc..

Description

Annular electric propeller supported by liquid suspension bearing

Technical Field

The utility model belongs to the technical field of marine propeller among the boats and ships turbine, concretely relates to annular electric power propeller that liquid suspension bearing supported.

Background

With the development of electric propulsion technology, electric propulsion systems are increasingly used on ships. Common electric propulsion systems include change-speed gearboxes, shafting (including shafts, couplings, various bearings and bearing blocks, stern tube seals), propellers, etc.; the propulsion mode of the electric propulsion system is that after the speed change gear box is driven by the motor to decelerate, the drive shafting and the propeller rotate to generate the thrust of advancing or retreating the ship, as shown in fig. 1. This propulsion method has the following problems: the structure is complex, the number of parts is large, the failure rate is high, the occupied space is large, and the weight is heavy; the propulsion efficiency is low: the motor and the propeller are driven by components such as a gear, a shaft system and the like, the gear is meshed to generate energy loss, and meanwhile, the bearing is usually a sliding bearing, so that the friction force is large and the friction power consumption is large; the transmission links generate intermediate transmission loss, and the propulsion efficiency of the system is reduced; the transmission gear is meshed to generate vibration and cause noise, then, water flow generates turbulent flow after flowing through the shafting and the underwater appendage, the propeller rotates in the turbulent flow to generate excitation and cavitation, and the cavitation bursts to generate noise.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, provided an annular electric power propeller that liquid suspension bearing supported, the utility model discloses a permanent magnet brushless motor who arranges the aquatic in directly drives no hub formula screw and rotates, has saved middle transmission, and rotor and screw subassembly are supported by liquid suspension bearing and are transmitted motor and hull with thrust on. The intermediate transmission loss between the motor and the propeller is reduced, the efficiency is improved, the structure of a propulsion system is simplified, and noise, vibration and the like are reduced.

For solving one of above-mentioned technical problem at least, the utility model discloses the technical scheme who takes is:

an annular electric thruster supported by a hydrodynamic bearing, comprising: a housing, a rim motor, a liquid suspension bearing system and a propeller, wherein,

the rim type motor includes: the stator assembly and the rotor assembly are arranged in the shell, and the end face flanges are respectively arranged at two ends of the shell;

the fluid suspension bearing system is located on the end face flange, the fluid suspension bearing system includes: the rotor end plate is connected with the rotor assembly, a first gap channel is formed between the rotor end plate and the end face flange, a first water flow channel communicated with the first gap channel is arranged inside the rotor end plate, the thrust disc is fixed at the end part of the rotor end plate, a second gap channel communicated with the first gap channel is formed between the thrust disc and the end face flange, and a second water flow channel communicated with the second gap channel and the first water flow channel is arranged inside the thrust disc and used for forming liquid suspension when water flows pass through the thrust disc;

the propeller is connected with the rotor assembly.

Further, the rotor end plate is also provided with a radial high-pressure water cavity, and the radial high-pressure water cavity is respectively communicated with the first clearance channel and the first water flow channel and is used for generating radial high-pressure water flow.

Further, the thrust disc is further provided with an axial high-pressure water cavity and a water inlet, the axial high-pressure water cavity is respectively communicated with the second gap channel and the second water flow channel and is used for generating axial high-pressure water flow, and the water inlet is communicated with the second water flow channel.

Furthermore, the water inlet is connected with a high-pressure water pump.

Further, the fluid suspension bearing system further includes: and the friction reducing block is arranged on the outer wall of the end face flange.

Further, the stator assembly is fixed above the inner side steps of the end face flanges at two ends, and the rotor assembly is located on the inner side of the stator assembly.

Further, the propeller is an integral propeller or a split propeller.

Further, the rim type motor is a rim type permanent magnet brushless motor.

The beneficial effects of the utility model include at least:

1) the liquid suspension bearing is adopted, so that the cost is reduced, and in addition, the reliability is improved due to the simpler structure;

2) the propulsion efficiency is improved: firstly, a permanent magnet brushless motor is adopted, and a permanent magnet replaces a coil, so that compared with a traditional separately excited motor, the current loss is reduced, and the motor efficiency and the power factor are improved; secondly, the inner circle of the rotor of the motor directly fixes the propeller, and the rotor directly drives the propeller to rotate, so that any intermediate transmission link is not needed; thirdly, the hydrodynamic suspension bearing supports the rotor assembly and the propeller to bear the weight and the thrust of the rotor assembly and the propeller, so that the rotor assembly and the propeller are in a suspension state in the rotating process, the friction force is reduced, the friction power consumption is reduced, and the propulsion efficiency is improved by the measures;

3) noise vibration reduction: because the rotor directly drives the propeller, the vibration and noise caused by the meshing of gears of a gear box in the traditional propulsion mode are eliminated; secondly, when the propeller runs, the bearing pair is a liquid suspension bearing in a non-contact mode, so that friction noise and vibration are greatly reduced, and in conclusion, noise vibration is reduced;

4) the structure is simplified, the weight is lightened, the reliability is improved, and the occupied space in the cabin is less: the middle transmission components such as a coupler, a gear box, a shafting, a sliding bearing, a bearing seat, a stern tube sealing system and the like which are inherent in the traditional electric propulsion type are eliminated, the structure is simpler, the reliability is higher, and the weight is greatly reduced. In addition, the motor is arranged under water, so that the space in the cabin is saved.

Drawings

FIG. 1 is a schematic diagram of a prior art electric propulsion system.

Fig. 2 is the structural schematic diagram of the annular electric thruster of the present invention.

Fig. 3 is a cross-sectional view taken along line C-C of fig. 2.

Fig. 4 is a schematic structural view of an integral propeller according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a split propeller according to an embodiment of the present invention.

Fig. 6 is a partially enlarged view of a portion a of fig. 3, illustrating a structure of the fluid suspension bearing system.

The structure comprises a motor 1, a gear box 2, a shafting 3, a propeller 4, a blade tip 401, a blade tip flange 402, a blade 403, a rotor assembly 5, a left end face flange 6, a shell 7, a stator assembly 8, a right end face flange 9, a liquid suspension bearing system 10, a rotor end plate 11, a first clearance channel 111, a first water flow channel 112, a radial high-pressure water cavity 113, a thrust disc 12, a second clearance channel 121, a second water flow channel 122, an axial high-pressure water cavity 123, a water inlet 124, a radial friction reducing block 13 and an axial friction reducing block 14.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following specific embodiments. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.

Fig. 2 is the utility model discloses annular electric power propeller structure schematic diagram, fig. 3 is the C-C of fig. 2 to the cross-sectional view, combine fig. 2 and 3 to show, the utility model relates to an annular electric power propeller that liquid suspension bearing supported mainly includes: the device comprises a shell, a rim type motor, a propeller and a liquid suspension bearing system.

The utility model discloses a rim formula permanent magnet brushless motor has replaced traditional separately excited formula three-phase asynchronous motor. The rim type motor mainly comprises a stator assembly, a rotor assembly, a machine shell and an end face flange. Motor stator module constitutes for iron core and coil, and whole embedment seals the insulating cement, and isolated and play insulating effect with water, the rotor includes the permanent magnet and embedment seals the insulating cement, prevents that water from getting into the inside permanent magnet that corrodes of rotor, and two ends are the rotor end plate about the rotor, form the rotor subassembly with the rotor together. Stator core pressure equipment is in motor housing, and the casing is the casing of propeller promptly, and the terminal surface flange of two end connection motors about the casing is: the stator assembly is fixed above the steps at the inner sides of the end face flanges at the two ends, and the rotor assembly is located on the inner side of the stator assembly.

Circle diameter is big in the rotor, can hold the screw, and the screw passes through the leaf tip to be fixed on the rotor subassembly inner circle, directly drives the screw by the rotor and rotates, and motor speed is screw rotational speed promptly, does not need intermediate transmission links such as gears. The motor stator generates a rotating magnetic field after a three-phase power supply is connected, the permanent magnet in the motor rotor generates electromagnetic force under the action of the rotating magnetic field, and the rotor rotates and outputs torque to drive the propeller to rotate in water to generate thrust for pushing a ship.

The screw is a metallic screw and also can be a composite material screw. The number of propeller blades is determined by calculation of hydrodynamic performance, and the number of blades can be 2, 3, 4, 5, 6 and the like, and the specific number is not particularly limited.

Fig. 4 is a schematic view of an integral propeller structure according to an embodiment of the present invention, and as shown in fig. 4, the propeller of this embodiment is integral, and each blade is connected to a whole through a common blade tip flange and then connected to the rotor assembly through the blade tip flange.

Fig. 5 is the split type screw structure sketch map of an embodiment, it is shown with reference to fig. 5, the screw blade of this embodiment is split type, and every paddle passes through the blade tip flange to be fixed on the rotor subassembly, is supported and direct drive by the rotor subassembly, because the screw is made split type simultaneously, has also made things convenient for dismantlement and change.

It can be understood that both the integral propeller and the split propeller are hub-free propellers without hubs, each blade is fixed on the rotor assembly through a blade tip flange and is directly driven by the rotor assembly, and the rotating speed of the motor, namely the rotating speed of the propeller, does not need a shafting and a hub for supporting and driving, and does not need intermediate driving links such as a transmission gear and the like.

Fig. 6 is a partial enlarged view of a portion a of fig. 3, and referring to fig. 6, the hydrodynamic bearing system is located on the end flange, and the hydrodynamic bearing system bears the weight of the rotor assembly and the propeller and the thrust of the propeller. The liquid suspension bearing system consists of a thrust disc, a friction reducing block, a rotor end plate and a water flow channel arranged inside the rotor end plate and the thrust disc, and more specifically: the rotor end plate is connected with the rotor assembly and provided with a first gap channel between the end face flanges, a first water flow channel communicated with the first gap channel is arranged inside the rotor end plate, the thrust disc is fixed at the end part of the rotor end plate and provided with a second gap channel communicated with the first gap channel between the end face flanges, and a second water flow channel communicated with the second gap channel and the first water flow channel is arranged inside the thrust disc.

The rotor end plate is further provided with a radial high-pressure water cavity, and the radial high-pressure water cavity is communicated with the first gap channel and the first water flow channel respectively and is used for generating radial high-pressure water flow.

The thrust disc is further provided with an axial high-pressure water cavity and a water inlet, the axial high-pressure water cavity is communicated with the second gap channel and the second water flow channel respectively and used for generating axial high-pressure water flow, and the water inlet is communicated with the second water flow channel.

The antifriction piece set up in on the outer wall of end face flange, include: the radial friction reducing block is positioned at the relative position of the radial high-pressure water cavity, and the axial friction reducing block is positioned at the relative position of the axial high-pressure water cavity.

The theory of operation of liquid suspension bearing system does: when the motor is started, the rotor assembly starts to rotate, the thrust disc connected with the rotor assembly rotates together, water at a water inlet of a second water flow channel in the thrust disc is sucked into the second water flow channel in the thrust disc, along with the high-speed rotation of the thrust disc and the rotor assembly, high-pressure water flow is formed under the action of centrifugal force, the water is guided into radial high-pressure water cavities in the thrust disc and a rotor end plate through a water path (in the direction shown by an arrow), the flow speed of the water flow is reduced, the water pressure is increased, a local high-pressure water area is formed between the radial high-pressure water cavity and the inner circular surface of a matched motor end face flange, the hydraulic thrust F acts on the inner circular surface of the end flange, the supporting force for supporting the rotor assembly is formed, the gravity of the rotor assembly is overcome, the rotor assembly is supported and is not contacted with the stator assembly.

When the motor is started to accelerate and stopped to decelerate, the centrifugal force is weakened, the supporting force generated by high-pressure water pressure is not enough to overcome the gravity of the rotor assembly and the propeller, the rotor end plate is in contact with the radial friction reducing block on the end face flange at the moment and is in a sliding friction state, and the direct friction pair is in a low-resistance friction state due to the low friction coefficient and the low wear rate of the friction reducing block, so that the reliable operation of the propeller in a low-speed state is ensured. The high-pressure water can be generated by the centrifugal force caused by the high-speed rotation of the rotor assembly, and can also be directly pumped in by a high-pressure water pump externally connected with a water inlet.

Referring to fig. 6, high-pressure water flow generated by high-speed rotation is simultaneously guided into an axial high-pressure water cavity on the end face of a thrust disc facing the end face of a motor end face flange, the water flow is decelerated, the water pressure is increased, axial water pressure is formed in a gap between the axial high-pressure water cavity and the end face flange, the high-pressure water generates water pressure thrust forces F towards two sides, namely the water pressure acts between the end face flange and the thrust disc to form axial pressure, the rotating thrust disc and the motor end face flange are separated by overcoming the thrust force of a propeller, the rotating thrust disc and the motor end face flange keep a certain gap and are in a non-contact suspension state, in the process, the pressure of the high-pressure water keeps balance with the thrust force of the propeller, the water pressure acting on the end face flange is transmitted to a shell and a hull through the motor end face flange to form thrust force for pushing the hull to advance, so that the function of a thrust bearing is realized, the heating and the abrasion are greatly reduced. Especially in the water with more silt, silt can produce the grinding effect between the relative frictional terminal surface, aggravate the friction between the terminal surface and generate heat. The utility model discloses use the liquid suspension bearing system that high-pressure rivers formed, eliminate the direct friction between the relative motion terminal surface, reduced the noise that direct sliding friction brought, reduced frictional force and the wearing and tearing that direct sliding friction leads to, improved the mechanical efficiency of motor, prolonged vice life-span and the reliability of friction.

When the motor is started to accelerate and stopped to decelerate, the centrifugal force is weakened, the supporting force generated by high-pressure water pressure is not enough to overcome the thrust of the propeller, the thrust disc is in direct contact with the end face flange through the axial friction reducing block at the moment and is in a sliding friction state, and the direct friction pair is in a low-resistance friction state due to the low friction coefficient and the low wear rate of the friction reducing block, so that the reliable operation of the propeller in a low-speed state is ensured.

Liquid suspension bearing system can be located the one end of rotor subassembly, also can arrange simultaneously in the two ends of rotor subassembly, when being located the one end of rotor subassembly, and the processing of being convenient for has ensured the vice axiality of friction between end flange and the rotor subassembly, has also improved machining efficiency simultaneously and has reduced manufacturing cost. When arranged at both ends of the rotor assembly, the support stiffness of the rotor assembly and the propeller will be increased, but at the same time with manufacturing complexity.

In summary, the utility model adopts the liquid suspension bearing, which reduces the cost, and in addition, the reliability is improved because the structure is simpler; the utility model provides high propulsion efficiency: firstly, a permanent magnet brushless motor is adopted, and a permanent magnet replaces a coil, so that compared with a traditional separately excited motor, the current loss is reduced, and the motor efficiency and the power factor are improved; secondly, the inner circle of the rotor of the motor directly fixes the propeller, and the rotor directly drives the propeller to rotate, so that any intermediate transmission link is not needed; thirdly, the hydrodynamic suspension bearing supports the rotor assembly and the propeller to bear the weight and the thrust of the rotor assembly and the propeller, so that the rotor assembly and the propeller are in a suspension state in the rotating process, the friction force is reduced, the friction power consumption is reduced, and the propulsion efficiency is improved by the measures; the utility model discloses noise vibration reduces: because the rotor directly drives the propeller, the vibration and noise caused by the meshing of gears of a gear box in the traditional propulsion mode are eliminated; secondly, when the propeller runs, the bearing pair is a liquid suspension bearing in a non-contact mode, so that friction noise and vibration are greatly reduced, and in conclusion, noise vibration is reduced; the utility model discloses simple structure, weight become light, the reliability improves, it is few to occupy the under-deck space: the middle transmission components such as a coupler, a gear box, a shafting, a sliding bearing, a bearing seat, a stern tube sealing system and the like which are inherent in the traditional electric propulsion type are eliminated, the structure is simpler, the reliability is higher, and the weight is greatly reduced. In addition, the motor is arranged under water, so that the space in the cabin is saved.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that various changes, modifications, substitutions and alterations can be made in the above embodiments by those skilled in the art without departing from the scope of the present invention, and that various changes in the detailed description and applications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims (8)

1. An annular electric thruster supported by a hydrodynamic bearing, comprising: a housing, a rim motor, a liquid suspension bearing system and a propeller, wherein,

the rim type motor includes: the stator assembly and the rotor assembly are arranged in the shell, and the end face flanges are respectively arranged at two ends of the shell;

the fluid suspension bearing system is located on the end face flange, the fluid suspension bearing system includes: the rotor end plate is connected with the rotor assembly, a first gap channel is formed between the rotor end plate and the end face flange, a first water flow channel communicated with the first gap channel is arranged inside the rotor end plate, the thrust disc is fixed at the end part of the rotor end plate, a second gap channel communicated with the first gap channel is formed between the thrust disc and the end face flange, and a second water flow channel communicated with the second gap channel and the first water flow channel is arranged inside the thrust disc and used for forming liquid suspension when water flows pass through the thrust disc;

the propeller is connected with the rotor assembly.

2. The annular electric thruster of claim 1, wherein the rotor end plate is further provided with a radial high pressure water chamber, and the radial high pressure water chamber is respectively communicated with the first clearance passage and the first water flow passage for generating radial high pressure water flow.

3. The annular electric thruster of claim 1, wherein said thrust disc is further provided with an axial high-pressure water chamber communicating with said second clearance passage and with a second water flow passage, respectively, for generating an axial high-pressure water flow, and a water inlet communicating with said second water flow passage.

4. The annular electric thruster of claim 3, wherein the water inlet is connected with a high pressure water pump.

5. The toroidal electric thruster of claim 1, wherein said hydrokinetic bearing system further comprises: and the friction reducing block is arranged on the outer wall of the end face flange.

6. The annular electric thruster of claim 1, wherein the stator assembly is fixed above the inner steps of the end flanges at both ends, and the rotor assembly is positioned inside the stator assembly.

7. The annular electric thruster of claim 1, wherein the propeller is an integral propeller or a split propeller.

8. An annular electric thruster according to claim 1, characterized in that the rim motor is a rim permanent magnet brushless motor.

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