CN112829911A - Counter-rotating rim propeller and underwater traveling tool adopting same - Google Patents
Counter-rotating rim propeller and underwater traveling tool adopting same Download PDFInfo
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- CN112829911A CN112829911A CN202110110560.2A CN202110110560A CN112829911A CN 112829911 A CN112829911 A CN 112829911A CN 202110110560 A CN202110110560 A CN 202110110560A CN 112829911 A CN112829911 A CN 112829911A
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- guide pipe
- propeller
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- rotating
- rear guide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/16—Propellers having a shrouding ring attached to blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
- B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/124—Sealing of shafts
Abstract
The invention discloses a contra-rotating rim propeller, which comprises a shell, a front guide pipe and a rear guide pipe; the front guide pipe is of a hollow and horn-shaped structure, and a first propeller is fixedly arranged in an inner ring of the large end part; the rear guide pipe is of a cylindrical annular structure, and a second propeller is fixedly arranged in the inner ring; the small end part of the front guide pipe is movably butted with the rear guide pipe and is fixed in end covers at two sides of the shell through bearings; the front guide pipe and the rear guide pipe are driven by power provided by the driving device to realize mutual reverse contrarotation. The invention fully utilizes the Venturi effect and the structural characteristics of the pipelines thereof, breaks through the conventional design, is reasonably arranged, excellently solves the contradiction between the high-power stator and rotor in the rim propeller and the limited installation space, greatly improves the propelling power and the propelling efficiency while ensuring the small volume of the rim propeller, fully utilizes the whirling energy of fluid by utilizing the movement mode of contra-rotating of double propellers, and further improves the propelling efficiency of the propeller.
Description
Technical Field
The invention belongs to the field of mechanical engineering sealing, and particularly relates to a self-adjusting sealing structure suitable for high rotating speed and a counter-rotating propeller adopting the counter-rotating sealing assembly.
Technical Field
As an effective energy-saving scheme for ship propulsion, a contra-rotating propeller is always concerned, namely two propellers are arranged in tandem on a propeller propulsion axis, the diameter of the front propeller is larger than that of the rear propeller, and the rotating directions of the two propellers are opposite, the vortex energy in the wake flow of the propeller cannot be utilized in the traditional single propeller propulsion system, the unused vortex energy generated by the front propeller is utilized on the rear propeller in the contra-rotating propeller propulsion system and is converted into effective propulsion power, although the contra-rotating propulsion system is beneficial to reducing the rotation loss of the wake flow and improving the propulsion efficiency, the contra-rotating propeller has the defects of complexity, high manufacturing difficulty, high manufacturing and maintenance cost and the like, and the blade tip part of the contra-rotating propeller has obvious cavitation phenomenon, the propeller has the defects of high radiation noise and low critical navigational speed, and a guide pipe is required to be additionally arranged outside the propeller and used for shielding the noise generated by the propeller and the inner flow passage.
Chinese patent "contra-rotating shaftless rim driving propeller" (CN105109650B) discloses a contra-rotating propeller, which uses a sliding bearing, and uses seawater to cool a motor, so as to be suitable for an environment with better water quality, but for a turbid environment with more sand grains, if the bearing and the contra-rotating connection part of two rotating shafts are not sealed and protected, the sand grains entering the gap will seriously affect the performance and the service life of parts, and a contra-rotating sealing part capable of simultaneously bearing radial load and axial load is required; in addition, the structure of the propeller is not difficult to find, the installation space of the stator and the rotor of the motor is extremely limited, the power of the motor has a direct relation with the volume, and in order to reduce water resistance, the guide pipe is required to be as thin as possible, so that the installation space of the motor part is further limited, the power of the propeller is also greatly limited, and the propeller becomes one of key technical bottlenecks for limiting the high power of the rim propulsion system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a contra-rotating sealing assembly which has self-adjustment performance and is suitable for high rotating speed and a contra-rotating propeller adopting the structure.
In order to achieve the purpose, the invention adopts the technical scheme that:
a contra-rotating rim propeller comprises a shell, a front guide pipe and a rear guide pipe; the front guide pipe is of a hollow and horn-shaped structure, and a first propeller is fixedly arranged in an inner ring of the large end part; the rear guide pipe is of a cylindrical annular structure, and a second propeller is fixedly arranged in the inner ring; the small end part of the front guide pipe is movably butted with the rear guide pipe, and the front guide pipe and the rear guide pipe which are connected into a whole are fixed in end covers at two sides of the shell through bearings; the front guide pipe and the rear guide pipe are powered by a driving device to realize mutual reverse rotation; the beneficial effects are that: the front guide pipe is of a hollow and horn-shaped structure, in the operation process, fluid enters from a large end part and passes through a gradual change part, the speed is increased due to the change of the inrush cross section area, the speed reaches the maximum value at the narrowest part, the static pressure reaches the minimum value, so that the fluid is sprayed out from a small end part at a high speed, the spraying speed of a water outlet is increased by utilizing the Venturi effect, the propelling efficiency is improved, particularly, the small end part with the horn-shaped reducing diameter of the front guide pipe is movably connected with a rear guide pipe, the installation space of a power driving part is greatly increased, as is well known, the volume of a driving device is greatly related to the output power, particularly, the motor has larger volume, the larger power can be provided, the conventional design and reasonable layout of the pair of wheel rim propellers break through, the contradiction between a high-power driving device and a narrow installation space in the wheel rim propellers is excellently solved, the small volume of the rim propeller is ensured, and the propelling power and the propelling efficiency are greatly improved; and the rotating directions of the first propeller and the second propeller are opposite in a mode of contra-rotating movement of the front guide pipe and the rear guide pipe, so that the tilting moment of the single propeller during rotation starting is eliminated, and the energy which cannot be utilized by the vortex energy of the wake flow in the single propeller propulsion system is utilized on the rear propeller and converted into effective propulsion power.
Preferably, the front guide pipe and the rear guide pipe are provided with heat dissipation structures; the beneficial effects are that: need give off a large amount of heats at motor operation process, if not timely heat dissipation, for the performance that influences the motor, the coil can probably be walked around under the serious condition, just in time at the motor operation, preceding pipe and back pipe can high-speed rotation drive the screw, in the effect of screw, a large amount of fluids can be followed the runner and passed through, can take away most heats, set up heat radiation structure such as recess or blade on preceding pipe and back pipe, not only can increase the area of contact of preceding pipe and back pipe and air, still can accelerate the inside hot air flow of motor, the radiating efficiency is greatly improved.
Preferably, the first propeller is detachably connected with the large end part, and a key groove is formed in the inner circle of the large end part; the second propeller is detachably connected with the rear guide pipe; the beneficial effects are that: the propeller belongs to a high-load moving part, needs regular maintenance and repair, has a complex structural form, greatly reduces the difficulty of integrated manufacture with the guide pipe by a detachable design, and is more convenient to maintain; the keyway transmits the kinetic energy of the guide pipe to the propeller, and provides torsional support for the rotation of the propeller.
Furthermore, first screw and second screw all can be assembled by a plurality of rim oar pieces and form, and to large-scale screw, the preparation of single rim oar piece is more convenient, can reduce the preparation degree of difficulty of screw greatly, saves the cost of manufacture.
Preferably, a clamping groove is formed in the inner circle of the large end part, and the first propeller is fixed through a clamping ring arranged in the clamping groove; the beneficial effects are that: during the rotation of the propeller, the fluid is pushed out backwards, and the propeller needs to bear large radial reaction force, and the clamping ring provides support for the reaction force needing to be borne.
Preferably, the small end part of the front guide pipe is movably butted with the rear guide pipe through a contra-rotating sealing assembly; the contra-rotating sealing assembly comprises a shaft hub and a shaft sleeve, wherein the shaft hub is wrapped on the shaft sleeve and is movably connected with the shaft sleeve through a bearing; the side edge of the bearing is provided with a salient pole and a concave pole; the concave pole is fixedly arranged on the shaft sleeve or the shaft hub, the outer side of the concave pole is provided with a permanent magnet, and the inner side of the concave pole is provided with a U-shaped or V-shaped groove; the salient pole is fixedly arranged on the shaft hub or the shaft sleeve, the top of the salient pole is arranged in the groove, and a U-shaped or V-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid; the magnetic fluid is accumulated at the bottom of the groove under the action of a magnetic field provided by the inner magnetic pole of the concave pole permanent magnet, and a U-shaped or V-shaped sealing strip is formed between the salient pole and the concave pole by utilizing the principle of static pressure balance of fluid in the U-shaped pipe; the beneficial effects are that: the bearing has good bearing capacity and rotation precision as the existing part, a gap with a U-shaped section is formed by the structural forms of the salient pole and the concave pole, and magnetic fluid is filled in the gap; the magnetic poles on the inner side of the permanent magnet provide a radial magnetic field for the magnetic fluid in a close distance, so that the two ends of the magnetic fluid generate a potential energy moving radially outwards, the magnetic fluid is further promoted to be accumulated at the bottom of the groove to form a sealing strip, the static pressure balance of the fluid in the U-shaped pipe is realized, the sealing strip is wholly deviated to achieve new balance under the condition that the pressure difference exists between the two ends of the magnetic fluid, the sealing surface cannot be damaged, and the sealing effect is not influenced; when the salient pole or the concave pole in a rotating state drives the magnetofluid to rotate, the magnetofluid can generate centrifugal force, the direction of the centrifugal force is also outward in the radial direction, the magnetofluid enhances the potential accumulated to the bottom of the concave pole under the equidirectional superposition effect of the magnetic force and the centrifugal force, according to the principle of static pressure balance of the fluid in the U-shaped tube, the pressure difference between two ends of the magnetofluid is zero, when the pressure difference is not zero, the magnetofluid can be wholly deviated in a gap to form liquid level height difference between two ends, so that the balanced pressure difference is realized, the higher the rotating speed is, the larger the centrifugal force is, the extremely small liquid level height difference can resist extremely strong external pressure difference, the extremely good dynamic sealing effect can be ensured, the problem that the sealing thickness is stretched and thinned and punctured due to the influence of the centrifugal force of the magnetofluid in a high-speed state is not worried about, the stronger the capacity of resisting the external pressure difference, the more suitable the working condition that the external pressure difference increases along with the increase of the rotating speed, and the self-regulation capacity is strong.
Preferably, the driving device is a plurality of motors which are uniformly distributed on the shell, and the motors drive the front guide pipe and the rear guide pipe to realize contra-rotation through transmission gears; the beneficial effects are that: compared with an internal combustion engine, the device for converting chemical energy into mechanical energy has the characteristics of simple structure, convenience and quickness in control, no pollution and the like, each motor is used as an independent power unit, and for a large propeller, the manufacturing and assembling are relatively simple, and the following points are pointed out: if one of the motors is damaged, the propeller can still work normally, and the reliability of the propeller is guaranteed.
Preferably, the driving device is formed by combining a motor stator fixed on the shell and a motor rotor respectively fixed on the front guide pipe and the rear guide pipe; the beneficial effects are that: the structure of the motor is combined with the front guide pipe and the rear guide pipe, so that the power of the motor is further improved, the space utilization rate is improved, and the motor is mainly used for small propulsion.
An underwater advancing tool comprises a body and a propeller for providing advancing power for the body, wherein the propeller is a rim propeller as claimed in any one of claims 1-7; the beneficial effects are that: the contra-rotating rim propeller has small volume, large power and high propelling efficiency, and can provide powerful power for underwater advancing tools; the contra-rotating rim propeller has low noise and small vibration, and can provide comfortable running experience for underwater moving tools; it should also be pointed out that this rim propeller is small, and the installation is convenient, establishes the equipment of electric power such as battery or generator in the body and provides the power for it, can greatly save the space in cabin in large-scale boats and ships, and convenient further optimization ship type improves the performance.
Compared with the prior art, the invention has the beneficial effects that: 1. the front propeller and the rear propeller rotate in opposite directions, so that the vortex energy in the fluid rotation process is completely converted into the propulsion power, the propulsion efficiency is improved, the dumping moment is eliminated, and the running stability of the propeller is ensured; 2. the front guide pipe increases the jet speed of the water outlet by utilizing the Venturi effect, improves the propelling efficiency, and simultaneously skillfully utilizes the structural characteristics of the rotating shaft to arrange the driving part at the small end part, thereby greatly increasing the installation space of the motor and improving the power of the propeller; 3. the contra-rotating sealing assembly adopts a magnetic fluid sealing mode, so that the loading capacity is ensured, the characteristics of low friction coefficient and good sealing performance are achieved, and the friction loss is reduced; 4. the contra-rotating rim propeller adopts the detachable propeller, so that the manufacture and the maintenance are convenient, and the manufacture and the maintenance cost are saved; 5. the underwater advancing tool adopting the runner edge propeller has low noise, small vibration, small occupied space of the propelling part and convenient linear optimization of the body.
Drawings
FIG. 1 is a schematic view of a contra-rotating rim propeller according to a first embodiment;
FIG. 2 is a schematic structural view of the front duct according to the first embodiment;
FIG. 3 is a schematic structural view of the counter-rotating seal assembly according to the first embodiment;
FIG. 4 is a schematic view of an equilibrium state of the counter rotating seal assembly in the presence of a differential pressure according to the first embodiment;
FIG. 5 is a schematic structural diagram of a propeller according to a first embodiment;
FIG. 6 is a schematic structural view of the contra-rotating rim propeller according to the second embodiment;
FIG. 7 is a schematic structural view of the counter-rotating seal assembly according to the second embodiment;
FIG. 8 is a schematic structural view of a contra-rotating rim propeller according to the third embodiment;
FIG. 9 is a schematic structural view of the contra-rotating seal assembly according to the third embodiment;
FIG. 10 is a schematic side view of the watercraft of the fourth embodiment;
FIG. 11 is a schematic view of the rear portion of the watercraft of the fourth embodiment;
in the figure: 1. a hub; 2. a shaft sleeve; 3. a bearing; 4. a permanent magnet; 41. a secondary permanent magnet; 5. salient poles; 6. a concave pole; 7. a magnetic fluid; 8. carrying a liquid bar; 9. an oil slinger; 10. lubricating grease; 11. a stuffing box; 12. adjusting the gasket; 13. an isolating ring; 14. throwing mud rings; 15. a snap ring; 16. an electric motor; 17. a front gear set; 18. a rear gear set; 19. a front conduit; 19-1, a keyway; 19-2, a clamping groove; 19-3, a heat dissipation structure; 20. a rear duct; 21. a first propeller; 21-1, convex strips; 22. a second propeller; 23. a front end cover; 24. a rear end cap; 25. a housing; 26. a front motor rotor; 27. a rear motor rotor; 28. a front motor stator; 29. a rear motor stator; 30. an auxiliary bearing; 31. a secondary bearing; 32. a rotating ring; 33. a body; 34. a propeller.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1-5, a contra-rotating rim propeller includes a housing 25, a front duct 19 and a rear duct 20; the front guide pipe 19 is of a hollow and horn-shaped structure, and a first propeller 21 is fixedly arranged in an inner ring of the large end part; the rear guide pipe 20 is of a cylindrical annular structure, and a second propeller 22 is fixedly arranged in an inner ring; the first propeller 21 and the second propeller 22 are detachably connected with respective installation guide pipes, the guide pipes are respectively provided with a key groove 19-1 and a clamping groove 19-2 for bearing radial and axial loads, and the front guide pipe and the rear guide pipe are respectively provided with a heat dissipation structure 19-3; the small end part of the front guide pipe 19 is movably connected with the rear guide pipe 20 through a contra-rotating sealing device and is fixed in a front end cover 23 and a rear end cover 24 at two sides of a shell 25 through bearings; the driving device is an electric motor 16, the electric motor 16 is fixed on the shell 25, and the front guide pipe 19 and the rear guide pipe 20 are driven by the electric motor 16 through the front gear set 17 and the rear gear set 18 to realize contra-rotation; the contra-rotating sealing assembly comprises a shaft hub 1 and a shaft sleeve 2, wherein the shaft hub 1 is wrapped on the shaft sleeve 2 and is connected with the shaft sleeve 2 through a main bearing 3; the inner end of the bearing 3 is provided with a salient pole 5 and a concave pole 6, the concave pole 6 is provided with a U-shaped groove and is connected with the permanent magnet 4 into a whole to be fixed on the shaft hub 1; the permanent magnet 4 is of an annular structure, is magnetized by radiation and is a monopole radiation ring, and the concave pole 6 is formed by injection molding of a flexible material; an adjusting gasket 12 is arranged between the bearing 3 and the permanent magnet 4; the salient pole 5 is fixed on the shaft sleeve 2, the top of the salient pole is arranged in the groove, and a U-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid 7; the magnetic fluid 7 is accumulated at the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 4 right above the outer side of the concave pole 6, and a U-shaped sealing belt is formed between the salient pole 5 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in a U-shaped pipe; in the running state, the magnetic fluid 7 is driven by the concave electrode 6 to rotate, so that the magnetic fluid 7 generates a radial outward centrifugal force; the magnetic fluid 7 is accumulated at the U-shaped bottom of the concave electrode 6 under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the concave electrode 6 for driving the magnetic fluid 7 to rotate, the carrier liquid strip 8 is bonded on the inner surface of a U-shaped groove of the concave electrode 6; an oil slinger 9 is arranged at the inner end of the permanent magnet 4, and the oil slinger 9 is fixed on the shaft sleeve 2 and rotates along with the shaft sleeve; a gap between the oil slinger 9 and the permanent magnet 4 is filled with magnetic lubricating grease 10; in order to increase the sealing performance of the structure, the end surface of the oil slinger 9 and the shaft hub 1 form labyrinth type seal; in order to prevent impurities from entering the sealing structure, a packing box 11 is arranged at the contact axial gap between the shaft hub 1 and the shaft sleeve; in order to increase the running stability and reliability of the contra-rotating sealing assembly, an auxiliary bearing 31 is integrated on the shaft hub 1; in order to guarantee the installation precision, the hub 1 and the shaft sleeve 2 are both provided with seam allowance structures.
When the contra-rotating rim propeller works, fluid enters from a large end part by the rotary pushing of the first propeller 21, passes through a gradually-changed part of a closing-in, the inrush current sectional area is gradually reduced, the flow rate is gradually increased, the speed reaches the maximum value at the narrowest part, and the static pressure reaches the minimum value, so that the fluid is sprayed out from the small end part at a high speed, the spraying speed of the fluid at a water outlet is increased by fully utilizing the Venturi effect, the propelling efficiency is improved, particularly, the front guide pipe 19 in a horn-shaped structure is connected with the rear guide pipe 20 in a reducing way, compared with the prior art, the installation space of the motor is further improved, the motor can be arranged at the rear end of the small end part, as well known, the power of the motor has a great relationship with the volume, and the larger the volume of the motor is, the larger the power can be provided; when fluid enters the second propeller 22, the second propeller 22 rotating in the reverse direction converts all vortex energy generated by the rotation of the first propeller 21 into propulsion power, so that the propulsion efficiency is further improved, the dumping moment is eliminated, and the running stability of the propeller is ensured; for the contra-rotating sealing assembly, according to the static pressure balance principle of the U-shaped tube, the magnetic fluid 7 keeps balance under the action of magnetic force in a static sealing state; if there is no pressure difference at the two ends of the magnetic fluid 7, the height difference h of the liquid level at the two ends is zero, if the pressure at one end is increased, the magnetic fluid 7 will wholly shift to the side with low pressure until a new balance state is reached, at this time, the height difference h of the liquid level is formed, and the magnetic fluid 7 in the height difference band balances the external pressure difference under the action of magnetic force; in a dynamic sealing state, the magnetic fluid 7 in a rotating state is acted by magnetic force and centrifugal force, the magnetic fluid and the centrifugal force are mutually superposed to provide a radial force field together to realize the static pressure balance of the U-shaped pipe, the higher the rotating speed is, the larger the centrifugal force is, the extremely small liquid level height difference h can resist extremely strong external pressure difference change, the excellent dynamic sealing effect is ensured, and the problem that the sealing is invalid due to the fact that the magnetic fluid 7 is thinned and punctured is not needed to be worried about; the magnetic lubricating grease 10 is adsorbed on the outer magnetic pole under the action of the permanent magnet 4 and is not easy to leak; when rotating, the oil slinger 9 drives the magnetic lubricating grease 10 to generate centrifugal force, and primary sealing is formed in the gap.
Example two
As shown in FIGS. 6-7, a contra-rotating rim propeller includes a housing 25, a front duct 19 and a rear duct 20; the front guide pipe 19 is of a hollow and horn-shaped structure, and a first propeller 21 is fixedly arranged in an inner ring of the large end part; the rear guide pipe 20 is of a cylindrical annular structure, and a second propeller 22 is fixedly arranged in an inner ring; the first propeller 21 and the second propeller 22 are detachably connected with respective installation guide pipes, and the guide pipes are provided with key grooves 19-1 and clamping grooves 19-2 for bearing radial and axial loads; the small end part of the front guide pipe 19 is movably connected with the rear guide pipe 20 through a contra-rotating sealing device and is fixed in a front end cover 23 and a rear end cover 24 at two sides of a shell 25 through bearings; the driving device is a combination of a motor stator fixed on the shell 25 and motor rotors fixed on the front guide pipe 19 and the rear guide pipe 20, and comprises a front motor rotor 26, a rear motor rotor 27, a front motor stator 28 and a rear motor stator 29; the front motor rotor 26 and the rear motor rotor 27 realize contra-rotating movement in opposite directions under the action of radial rotating magnetic fields provided by the front motor stator 28 and the rear motor stator 29; the contra-rotating sealing assembly comprises a shaft hub 1 and a shaft sleeve 2 which are respectively used for being connected to a pair of components which rotate in opposite directions; the shaft hub 1 is wrapped on the shaft sleeve 2 and is connected with the shaft sleeve 2 through a bearing 3; both sides of the bearing 3 are provided with a salient pole 5 and a concave pole 6, the concave pole 6 is provided with a U-shaped groove and is connected with the permanent magnet 4 into a whole and fixed on the shaft sleeve 2 through a rotating ring 32; the permanent magnet 4 is of an annular structure, is magnetized by radiation and is a monopole radiation ring, and the concave pole 6 is formed by injection molding of a flexible material; a spacer ring 13 is arranged between the permanent magnet 4 at the inner side end and the bearing 3; the salient pole 5 is fixed on the shaft hub 1, the top of the salient pole is arranged in the groove, and a U-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid 7; the magnetic fluid 7 is accumulated at the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 4 right above the outer side of the concave pole 6, and a U-shaped sealing belt is formed between the salient pole 5 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in a U-shaped pipe; in the running state, the magnetic fluid 7 is driven by the concave electrode 6 to rotate, so that the magnetic fluid 7 generates a radial outward centrifugal force; the magnetic fluid 7 is accumulated at the U-shaped bottom of the concave electrode 6 under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the concave electrode 6 for driving the magnetic fluid 7 to rotate, the carrier liquid strip 8 is bonded on the inner surface of a U-shaped groove of the concave electrode 6; the upper end of the outer ring of the rotating ring 32 is provided with an auxiliary permanent magnet 41 which is fixedly arranged on the shaft hub 1 and forms a gap with the rotating ring 32; the gap between the rotating ring 32 and the auxiliary permanent magnet 41 is filled with magnetic grease 10; in order to prevent impurities from entering the sealing structure, a packing box 11 is arranged at the contact axial gap between the shaft hub 1 and the shaft sleeve; in order to increase the running stability and reliability of the contra-rotating sealing assembly, an auxiliary bearing 30 is arranged on the shaft hub 1; in order to guarantee the installation precision, the hub 1 and the shaft sleeve 2 are both provided with seam allowance structures.
It should be noted that, at this time, the inner side of the notch 6 and the outer side of the rotating ring 32 both form a "U" shaped sealing band, when the rotating ring 32 drives the notch 6 to rotate, the inner and outer sealing bands resist external pressure difference under the same direction superposition of centrifugal force and magnetic force, and the sealing performance is doubly ensured; the magnetic grease 10 can be replaced by the magnetic fluid 7, if the cost is not counted.
EXAMPLE III
As shown in fig. 8-9, a contra-rotating rim propeller includes a housing 25, a front duct 19 and a rear duct 20; the front guide pipe 19 is of a hollow and horn-shaped structure, and a first propeller 21 is fixedly arranged in a large-end conical surface inner ring; the rear guide pipe 20 is of a cylindrical annular structure, and a second propeller 22 is fixedly arranged in an inner ring; the first propeller 21 and the second propeller 22 are detachably connected with respective installation guide pipes, and the guide pipes are provided with key grooves 19-1 and clamping grooves 19-2 for bearing radial and axial loads; the small end part of the front guide pipe 19 is movably connected with the rear guide pipe 20 through a contra-rotating sealing device and is fixed in a front end cover 23 and a rear end cover 24 at two sides of a shell 25 through bearings; the driving device is a combination of a motor stator fixed on the shell 25 and motor rotors fixed on the front guide pipe 19 and the rear guide pipe 20, and comprises a front motor rotor 26, a rear motor rotor 27, a front motor stator 28 and a rear motor stator 29; the front motor rotor 26 and the rear motor rotor 27 realize contra-rotating movement in opposite directions under the action of axial rotating magnetic fields provided by the front motor stator 28 and the rear motor stator 29; the contra-rotating sealing assembly comprises a shaft hub 1 and a shaft sleeve 2 which are respectively used for being connected to a pair of components which rotate in opposite directions; the shaft hub 1 is wrapped on the shaft sleeve 2 and is connected with the shaft sleeve 2 through a bearing 3; the inner side sealing edge of the bearing 3 is provided with a salient pole 5 and a concave pole 6, the concave pole 6 is provided with a U-shaped groove and is fixed on the shaft sleeve 2 through a rotating ring 32; the upper end of the outer ring of the rotating ring 32 is provided with a permanent magnet 4 which is fixed in the mounting groove of the shaft hub 1 and forms a gap with the rotating ring 32; the permanent magnet 4 is of an annular structure, is magnetized by radiation and is a monopole radiation ring, and the concave pole 6 is formed by injection molding of a flexible material; a spacer ring 13 is arranged between the permanent magnet 4 and the bearing 3; the salient pole 5 is fixed on the shaft hub 1, the top of the salient pole is arranged in the groove, and a U-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid 7; the magnetic fluid 7 is accumulated at the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 4 right above the outer side of the concave pole 6, and a U-shaped sealing belt is formed between the salient pole 5 and the concave pole 6 by utilizing the principle of static pressure balance of fluid in a U-shaped pipe; in the running state, the magnetic fluid 7 is driven by the concave electrode 6 to rotate, so that the magnetic fluid 7 generates a radial outward centrifugal force; the magnetic fluid 7 is accumulated at the U-shaped bottom of the concave electrode 6 under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the concave electrode 6 for driving the magnetic fluid 7 to rotate, the carrier liquid strip 8 is bonded on the inner surface of a U-shaped groove of the concave electrode 6; the gap between the rotating ring 32 and the permanent magnet 4 is filled with magnetic grease 10, and if the cost is not counted, the magnetic fluid 7 can be filled; in order to prevent impurities from entering the sealing structure, a packing box 11 is arranged at the contact axial gap between the shaft hub 1 and the shaft sleeve; in order to increase the running stability and reliability of the contra-rotating sealing assembly, an auxiliary bearing 30 is arranged on the shaft hub 1; in order to guarantee the installation precision, the hub 1 and the shaft sleeve 2 are both provided with seam allowance structures.
Example four
As shown in fig. 10 to 11, an underwater traveling tool includes a body 33 and a propeller 34 for providing a traveling power to the body 33, wherein a cross section of a tail of the body 33 is W-shaped, the W-shaped cross section extends to a position close to a head of the body 33, and a straight-through flow channel is formed in a longitudinal direction of a middle portion of the body 33; the propeller 34 is any one of the above-mentioned contra-rotating rim propellers and is installed in the stern runner of the body 33, so that the cabin space inside the body 33 occupied by the traditional propulsion system is effectively reduced, and the space utilization rate is improved; the body 33 is also provided with a storage battery or a generator and other devices for providing power and a driving and controlling device of the motor part of the rim propeller. When the body 33 advances in water, water can directly enter the contra-rotating rim propeller from the bow runner, so that the extra work of the loss required by water absorption at the bottom in the traditional pump jet propeller is avoided, the utilization rate of power is improved, and more power is converted into thrust.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A contra-rotating rim propulsor characterized by: comprises a shell, a front conduit and a rear conduit; the front guide pipe is of a hollow and horn-shaped structure, and a first propeller is fixedly arranged in an inner ring of the large end part; the rear guide pipe is of a cylindrical annular structure, and a second propeller is fixedly arranged in the inner ring; the small end part of the front guide pipe is movably butted with the rear guide pipe, and the front guide pipe and the rear guide pipe which are connected into a whole are fixed in end covers at two sides of the shell through bearings; the front guide pipe and the rear guide pipe are powered by a driving device to realize mutual reverse rotation.
2. A contra-rotating rim propulsor according to claim 1, wherein: and heat dissipation structures are arranged on the front guide pipe and the rear guide pipe.
3. A contra-rotating rim propulsor according to claim 1, wherein: the first propeller is detachably connected with the large end part, and a key groove is formed in the inner circle of the large end part; the second propeller is detachably connected with the rear guide pipe.
4. A contra-rotating rim propulsor according to claim 1, wherein: the circle is equipped with the draw-in groove in the big tip, first screw is fixed through the snap ring that sets up in the draw-in groove.
5. A contra-rotating rim propulsor according to claim 1, wherein: the small end part of the front guide pipe is movably butted with the rear guide pipe through a contra-rotating sealing assembly; the contra-rotating sealing assembly comprises a shaft hub and a shaft sleeve, wherein the shaft hub is wrapped on the shaft sleeve and is movably connected with the shaft sleeve through a bearing; the side edge of the bearing is provided with a salient pole and a concave pole; the concave pole is fixedly arranged on the shaft sleeve or the shaft hub, the outer side of the concave pole is provided with a permanent magnet, and the inner side of the concave pole is provided with a U-shaped or V-shaped groove; the salient pole is fixedly arranged on the shaft hub or the shaft sleeve, the top of the salient pole is arranged in the groove, and a U-shaped or V-shaped gap is formed between the salient pole and the groove; the gap is filled with magnetic fluid; the magnetic fluid is accumulated at the bottom of the groove under the action of a magnetic field provided by the inner magnetic pole of the concave pole permanent magnet, and a U-shaped or V-shaped sealing strip is formed between the salient pole and the concave pole by utilizing the principle of static pressure balance of fluid in the U-shaped pipe.
6. A contra-rotating rim propulsor according to claim 1, wherein: the driving device is a plurality of motors which are uniformly distributed on the shell, and the motors drive the front guide pipe and the rear guide pipe to realize contra-rotation through transmission gears.
7. A contra-rotating rim propulsor according to claim 1, wherein: the driving device is formed by combining a motor stator fixed on the shell and a motor rotor respectively fixed on the front guide pipe and the rear guide pipe.
8. An underwater travel tool, characterized in that: the propeller comprises a body and a propeller used for providing advancing power for the body, wherein the propeller is a contra-rotating rim propeller in any one of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110110560.2A CN112829911A (en) | 2021-01-27 | 2021-01-27 | Counter-rotating rim propeller and underwater traveling tool adopting same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110110560.2A CN112829911A (en) | 2021-01-27 | 2021-01-27 | Counter-rotating rim propeller and underwater traveling tool adopting same |
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| CN112829911A true CN112829911A (en) | 2021-05-25 |
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| CN202110110560.2A Pending CN112829911A (en) | 2021-01-27 | 2021-01-27 | Counter-rotating rim propeller and underwater traveling tool adopting same |
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Cited By (1)
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| CN114180018A (en) * | 2021-11-30 | 2022-03-15 | 赣州潜行精密制造有限公司 | Hub-free rim propeller |
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