阅读说明：本技术 一种密封电动喷泵推进器 (Sealed electric jet pump propeller ) 是由 王前进 于 2021-02-04 设计创作，主要内容包括：本发明公开了一种密封电动喷泵推进器,包括有壳体及转轴,转轴通过轴承活动连接在壳体两侧的端盖中,由电机定子与转子提供动力旋转,转轴输出端固定安装有螺旋桨,螺旋桨外侧设有文氏管中；轴承侧边设有密封组件,密封组件包括有凹极和凸极,凹极和凸极其中之一固定在转轴上；凹极呈环状结构,外侧设有永磁体,内侧设有凹槽；凸极顶部置于凹槽内,并与凹槽之间形成有U型间隙；所述间隙内填充磁流体；磁流体在永磁体内侧磁极提供的磁场作用下积聚在凹槽底部,利用流体在U型管中静压平衡的原理,在凸极与凹极之间形成U型的密封带。本发明利用磁流体密封提供了一种密封性能好、摩擦系数低的高性能的密封电动喷泵推进器。(The invention discloses a sealed electric jet pump propeller which comprises a shell and a rotating shaft, wherein the rotating shaft is movably connected in end covers at two sides of the shell through a bearing and is rotated by power provided by a motor stator and a rotor; the side edge of the bearing is provided with a sealing assembly, the sealing assembly comprises a concave pole and a convex pole, and one of the concave pole and the convex pole is fixed on the rotating shaft; the concave pole is in an annular structure, 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 groove; 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; magnetic fluid is filled in the gap; the magnetic fluid is accumulated at the bottom of the groove under the action of a magnetic field provided by the magnetic poles at the inner side of the permanent magnet, and a U-shaped sealing belt is formed between the salient pole and the concave pole by utilizing the principle of static pressure balance of the fluid in the U-shaped pipe. The invention provides a high-performance sealed electric jet pump propeller with good sealing performance and low friction coefficient by utilizing magnetic fluid sealing.)

1. The utility model provides a sealed electronic jet pump propeller which characterized in that: the device comprises a shell and a rotating shaft, wherein the rotating shaft is movably connected in end covers at two sides of the shell through a bearing, a motor stator and a rotor provide power to rotate, a propeller is fixedly installed at the output end of the rotating shaft, a venturi tube is arranged at the outer side of the propeller, and the venturi tube is connected on the shell; the side edge of the bearing is provided with a sealing assembly, the sealing assembly comprises a concave pole and a convex pole, and one of the concave pole and the convex pole is fixed on the rotating shaft; the concave pole is of an annular structure, 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 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; magnetic fluid is filled in the gap; the magnetic fluid is accumulated at the bottom of the groove under the action of a magnetic field provided by the magnetic poles at the inner side of the permanent magnet, and a U-shaped or V-shaped sealing belt is formed between the salient pole and the concave pole by utilizing the principle of static pressure balance of the fluid in the U-shaped pipe.

2. A canned motor-driven spray pump impeller in accordance with claim 1, wherein: and a liquid carrying bar for increasing the contact area with the magnetic fluid is arranged in the gap and is fixed on the rotating part.

3. A canned motor-driven spray pump impeller in accordance with claim 1, wherein: the concave pole and the permanent magnet are connected into a whole and fixed on the rotating shaft through the rotating ring, and the salient pole is fixed in the end cover of the shell through the support ring.

4. A canned motor-driven spray pump impeller in accordance with claim 3, wherein: the outer end of the rotating ring is provided with a separation plate, the separation plate is fixed in an end cover of the shell, and lubricating grease is filled in a gap between the rotating ring and the end cover.

5. A canned motor-driven spray pump impeller in accordance with claim 4, wherein: the outer end of the rotating ring is provided with a mud throwing ring which is fixed on the rotating shaft.

6. A canned motor-driven spray pump impeller in accordance with claim 1, wherein: the edge of the salient pole is in contact with the salient pole to form a closed space, and the magnetic fluid is limited in a U-shaped or V-shaped closed space formed between the salient pole and the salient pole.

7. A canned motor-driven spray pump impeller in accordance with claim 1, wherein: the salient pole is fixed on the rotating shaft, and the permanent magnet and the concave pole are connected into a whole and fixed in an end cover of the shell.

8. A canned motor-driven spray pump impeller in accordance with claim 1, wherein: an exciter body is arranged on the outer side of the permanent magnet, a coil winds on the exciter body, and a magnetic field is generated after the coil is electrified; the exciter body is fixed to the end cap of the housing.

9. A canned motor-driven spray pump impeller in accordance with claim 1, wherein: the shell is provided with an air pressure adjusting device for balancing the internal and external pressure difference.

10. A canned motor-driven spray pump impeller in accordance with claim 9, wherein: the air pressure adjusting device comprises a cylinder body and a piston, wherein the two ends of the cylinder body are provided with openings, and the piston is arranged in the cylinder body.

Technical Field

The invention belongs to the field of energy conversion engineering machinery, and particularly relates to a sealed electric jet pump propeller with good sealing performance and low friction coefficient.

Technical Field

With the recent requirement for environment-friendly clean energy, more and more propellers are developed in the aspect of electric propulsion and are continuously miniaturized, and in view of the fact that a jet pump type propulsion device has the same performance as a pitch-variable propeller in the aspects of acceleration and braking performance, has the advantages of excellent high-speed maneuverability, capability of effectively reducing radiation noise and the like, the jet pump type propulsion device is attracted by the attention of various research and development mechanisms, and the electric jet pump propulsion device is also greatly developed.

The main power of the electric jet pump propeller usually adopts a motor to start power, and in order to better cool the electric power, the motor is preferably placed in water, in order to ensure that silt, water and other impurities are prevented from entering the motor and the performance of the motor is influenced, the movable part of the output shaft end of the motor needs to be sealed, a bearing is used as an important part for supporting a rotating shaft, the friction coefficient in the moving process of a rotor is reduced, the rotation precision of the rotor is ensured, but the sealing performance of the bearing is insufficient, particularly in the running process, a sealing device is generally added on the outer side of the bearing, the existing sealing device adopts contact sealing, the sealing mode has large friction coefficient, the energy efficiency of the motor is low, and the friction generates a large amount of harmful heat.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a high-performance sealed electric jet pump propeller which is good in sealing performance and low in friction coefficient.

In order to achieve the purpose, the invention adopts the technical scheme that:

a sealed electric jet pump propeller comprises a shell and a rotating shaft, wherein the rotating shaft is movably connected in end covers at two sides of the shell through bearings and is rotated by power provided by a motor stator and a rotor; the side edge of the bearing is provided with a sealing assembly, the sealing assembly comprises a concave pole and a convex pole, and one of the concave pole and the convex pole is fixed on the rotating shaft; the concave pole is of an annular structure, 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 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; magnetic fluid is filled in the gap; the magnetic fluid is accumulated at the bottom of the groove under the action of a magnetic field provided by the magnetic poles at the inner side of the 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 the fluid in the U-shaped pipe; the beneficial effects are that: the venturi tube is arranged outside the propeller, so that the radiation noise can be effectively reduced, and the propelling efficiency can be improved by utilizing the venturi effect; the bearing ensures the stability of the relative position of each part of the sealing assembly in the rotating process and provides extremely strong bearing capacity, and the structural forms of the salient pole and the concave pole jointly create a gap with a U-shaped section, and the 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; if the distance between the outer ring and the inner ring of the bearing is large enough, the sealing assembly can be directly integrated between the outer ring and the inner ring of the bearing to form the sealing bearing for use in order to simplify the structure.

Preferably, a carrier liquid strip for increasing the contact area with the magnetic fluid is arranged in the gap and is fixed on the rotating part; the beneficial effects are that: the liquid carrying bar is used as an extension part of the concave pole or the convex pole, so that the surface contact area of the concave pole or the convex pole and the magnetic fluid is indirectly increased, the capacity of the concave pole or the convex pole for driving the magnetic fluid to rotate is enhanced, the magnetic fluid can obtain more energy to rotate, and a larger centrifugal force is generated; the carrier liquid bar can be made of a material with a sponge structure, such as high-density sponge, and is mainly characterized by flexibility and porosity, fluid can freely shuttle in pores of the carrier liquid bar without affecting the fluidity of the carrier liquid bar and further without affecting the sealing effect of the fluid, and more importantly, the sponge structure of the carrier liquid bar is criss-cross, so that the capacity of the rotating part for driving the magnetic fluid to rotate is greatly increased; in general, the carrier strip may be replaced with batt fiber or down for cost savings.

Furthermore, the permanent magnet is of an annular structure and is magnetized by radiation, the permanent magnet is a single-pole radiation ring, magnetic poles of the single-pole radiation ring are respectively positioned on the inner side and the outer side, as is known, the magnetic poles are the strongest parts in the magnet, magnetic induction lines are distributed most densely, magnetic field lines closer to the inner magnetic poles of the annular permanent magnet are in a radial distribution state, the groove is tightly attached to the inner magnetic poles of the annular permanent magnet and is positioned in a center position, the whole sealing band is positioned in the optimal position where the magnetic poles provide magnetic fields in a close distance, the maximum radial magnetic force can be obtained, further, magnetic fluid is promoted to be accumulated at the bottom of the groove to form the sealing band, the static pressure balance of the fluid in the U-shaped. The permanent magnet can be formed by combining a plurality of fan-shaped permanent magnets in a staggered manner, a radiation ring can be adopted for the annular permanent magnet with a small radius, the processing is easy, but the processing is not easy for the annular permanent magnet with a large diameter, and the processing difficulty can be reduced by adopting a combined manner; in order to make the magnetic field distribution more uniform, the sector permanent magnets are arranged in a staggered manner, and a radiation magnetizing or radial magnetizing mode is adopted.

Preferably, the concave pole and the permanent magnet are connected into a whole and fixed on the rotating shaft through the rotating ring, and the salient pole is fixed in the end cover of the shell through the support ring; the beneficial effects are that: the permanent magnet and the concave pole are connected into a whole to further shorten the distance between the magnetic pole and the magnetic fluid, so that the magnetic fluid can obtain larger magnetic force and generate stronger sealing performance; the concave pole is fixed on the rotating component, on one hand, the magnetic fluid is accumulated towards the bottom of the groove under the action of a magnetic field, the magnetic particles in the magnetic fluid are distributed unevenly under the action of the magnetic field, the concentration of the magnetic particles is denser at the part closer to the magnetic pole, and further the part closer to the magnetic pole is, the viscosity of the magnetic fluid is higher, compared with the salient pole, the concave pole rotates to drive the magnetic fluid to obtain centrifugal force, so that the sealing performance is higher in a dynamic sealing state, and the viscosity of the magnetic fluid close to the salient pole is small, the friction force between the magnetic fluid and the salient pole is small during rotation, and the heat generated during operation is relatively small; on the other hand, in the sealing structure, the concave part is arranged at the outer ring of the salient pole, the surface contact area of the concave pole and the magnetic fluid is larger than that of the salient pole and the magnetic fluid, the generated static friction force is large, the transmitted energy is large, the capacity of driving the magnetic fluid to rotate is better than that of the salient pole, and in the rotating process, the speed of the concave pole line at the outer ring is larger than that of the salient pole at the inner ring, the generated centrifugal force is larger, and the resistance to external pressure difference is better facilitated; the concave pole is preferably made of flexible materials, such as high-elasticity polymers with strong plasticity, more specifically polytetrafluoroethylene, which is resistant to high temperature and low temperature, and when the concave pole is made of flexible materials, the annular permanent magnet can be used as a support to provide powerful support for the concave pole, so that the concave pole is ensured not to deform during high-speed operation, the sealing effect is further ensured, and the number of parts is reduced; it is especially pointed out that, because the magnetic poles of the permanent magnet are respectively positioned at the inner side and the outer side, the inner side magnetic pole provides a magnetic field for the magnetic fluid, and the outer side magnetic pole can also provide a magnetic field, if a U-shaped gap is formed in the outer space of the permanent magnet, the magnetic grease can be filled in the non-Newtonian magnetic fluid with high viscosity and low cost, and an auxiliary sealing strip is formed under the action of centrifugal force.

Preferably, the outer end of the rotating ring is provided with a separation plate, the separation plate is fixed in an end cover of the housing, and a gap between the rotating ring and the end cover is filled with lubricating grease; the beneficial effects are that: the labyrinth type sealing structure is formed, a U-shaped gap is formed at the periphery of the permanent magnet, lubricating grease, preferably magnetic lubricating grease, is filled in the gap, centrifugal effect generated when the rotating ring operates and strong magnetic attraction of the magnetic pole of the permanent magnet to the magnetic lubricating grease are fully utilized to form auxiliary sealing, and sealing performance is improved.

Preferably, the outer end of the rotating ring is provided with a mud throwing ring which is fixed on the rotating shaft; the beneficial effects are that: rotatory mud ring that gets rid of utilizes centrifugal force to throw away dust, silt in the fluid, prevents that outside dust, silt from getting into the bearing in, reduces bearing wear, increase of service life.

Preferably, the female pole edge part is in contact with the salient pole to form a closed space, and the magnetic fluid is limited in a U-shaped or V-shaped closed space formed between the salient pole and the female pole; the beneficial effects are that: on one hand, the magnetic fluid can be prevented from being greatly leaked out when the magnetic fluid is separated from the constraint of magnetic force during violent vibration; on the other hand, the magnetic fluid sealing device can prevent external impurities from entering the magnetic fluid to influence the characteristics of the magnetic fluid and ensure the sealing effect.

Preferably, the salient pole is fixed on the rotating shaft, and the permanent magnet and the concave pole are connected into a whole and fixed in an end cover of the shell; the beneficial effects are that: the magnetic field generator is suitable for occasions where the exciting body needs to be arranged on the outer side of the permanent magnet, the connection of a winding coil on the exciting body is convenient, the rotating salient poles drive the magnetic fluid to rotate, and the fluid generates centrifugal force.

Preferably, an exciter is arranged on the outer side of the permanent magnet, a coil is wound on the exciter, and a magnetic field is generated after the coil is electrified; the excitation body is fixed on the outer sleeve; the beneficial effects are that: the exciter with the coil generates a magnetic field after being electrified, the intensity change of the magnetic field generated by the exciter can be controlled by changing the current, so that the sealing intensity is controllable, the exciter is suitable for working occasions with special requirements, and further, the exciter with the coil is fixedly arranged on a static part outside the concave pole, thereby facilitating the connection of a circuit.

Furthermore, the excitation body comprises excitation columns and excitation rings, and the excitation columns wound with coils are uniformly distributed on the excitation rings; the excitation column wound with the coil is electrified to provide a magnetic field, and the excitation ring distributes the magnetic field along the circumference, so that the distribution uniformity of the magnetic fluid is ensured, and the sealing effect is further ensured; the excitation body with large radius can be manufactured in a mode of split combination and staggered arrangement.

Preferably, the shell is provided with an air pressure adjusting device for balancing the internal and external pressure difference; the beneficial effects are that: for extreme environment, the air pressure adjusting device is used for balancing the pressure difference between the outside and the inside of the propeller, reducing the pressure difference between the inside and the outside, and ensuring the sealing effect within the range capable of being borne by the seal.

Furthermore, the air pressure adjusting device comprises a cylinder body and a piston, wherein the two ends of the cylinder body are provided with openings, and the piston is arranged in the cylinder body; the beneficial effects are that: the cylinder body is fixed on a static part, the openings at two ends are communicated with the outside and the atmosphere in the propeller, the piston is arranged in the cylinder body and slides under the action of the internal and external pressure difference to balance the pressure difference, and the purpose of self-adjusting the internal and external pressure difference is realized.

Preferably, the sealing assembly enables the inner space of the propeller to be made into a closed state, the inner space can be filled with insulating liquid, preferably insulating oil, so as to exhaust gas in the inner space, when the external pressure of the sealing assembly changes, the strong compression resistance of the inner liquid enables the liquid level difference of the sealing belt not to change basically, the high-strength sealing effect is guaranteed, and the insulating liquid can also play a role in lubricating moving parts and dissipating heat.

Compared with the prior art, the invention has the beneficial effects that: 1. the pod propeller has good sealing performance and low friction coefficient, thereby greatly providing the protection grade of the device and providing the energy conversion efficiency; 2. the method for sealing the magnetic fluid by binding the magnetic fluid in the air gap of the magnetic circuit through axial magnetic tension in the conventional method is broken through, the magnetic fluid is applied with a magnetic force which faces outwards in the radial direction, and the magnetic fluid is promoted to form a U-shaped sealing strip by utilizing the principle of static pressure balance of the fluid in a U-shaped pipe, so that the sealing strip not only ensures the characteristic of a low friction pair of the magnetic fluid, but also eliminates the risk of sealing failure caused by the action of centrifugal force of the magnetic fluid; 3. the centrifugal force is changed from the harmful surface to the beneficial surface, the higher the rotating speed is, the larger the centrifugal force is, the stronger the sealing effect is, and the self-regulation capability is extremely strong; 4. the device has the self-regulation capability of the internal and external pressure difference, and can be used in extreme environments.

Drawings

FIG. 1 is a schematic view of a sealed electric jet pump impeller according to a first embodiment;

FIG. 2 is a schematic structural view of a seal portion according to a first embodiment;

FIG. 3 is a schematic structural diagram of the recess and carrier bar according to one embodiment;

FIG. 4 is a schematic structural diagram of the monopole radiating ring according to the first embodiment;

FIG. 5 is a schematic view of a permanent magnet according to a first embodiment of the present invention;

FIG. 6 is a schematic view showing the equilibrium state of the magnetic fluid sealing tape in the presence of a pressure differential according to the first embodiment;

FIG. 7 is a schematic view of the sealed electric jet pump impeller according to the second embodiment;

FIG. 8 is a schematic structural view of a seal portion in the second embodiment;

FIG. 9 is a schematic view of the sealed electric jet pump impeller according to the third embodiment;

FIG. 10 is a schematic structural view of a seal portion in the third embodiment;

FIG. 11 is a schematic view of the sealed electric jet pump impeller according to the fourth embodiment;

FIG. 12 is a schematic structural view of a seal portion in the fourth embodiment;

FIG. 13 is a structural diagram of the integrated design of the exciter body according to the fourth embodiment;

FIG. 14 is a schematic structural diagram of the exciter assembly of the fourth embodiment;

FIG. 15 is a schematic view of the structure of a propeller of a sealed electric spray pump according to the fifth embodiment;

FIG. 16 is a schematic structural view of a seal portion in the embodiment;

in the figure: 1. a housing; 2. a motor stator; 3. a motor rotor; 4. a tail end cover; 5. a front end cover; 6. a bearing; 7. a concave pole; 8. salient poles; 9. a permanent magnet; 91. permanent magnetic tiles; 10. a magnetic fluid; 11. carrying a liquid bar; 12. a rotating ring; 13. a support ring; 14. a separator plate; 15. throwing mud rings; 16. lubricating grease; 17. a rubber ring; 18. a piston; 19. a cylinder body; 20. a holder; 21. a protective cover; 22. a lead slot; 23. an exciter body; 23-1, an excitation column; 23-2, a coil; 23-3, exciting a magnetic ring; 23-4, excitation tiles; 24. a shaft sleeve; 25. a water inlet; 26. insulating oil; 27. a propeller; 28. a venturi; 29. a commutator segment; 30. connecting the flow channel; 31. a rotating shaft; 32. a connecting rod.

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 to 6, a sealed electric jet pump propeller includes a housing 1 and a rotating shaft 31, wherein the rotating shaft 31 is movably connected to a front end cover 5 and a rear end cover 4 at two ends of the housing 1 through a bearing 6, and a motor stator 2 and a motor rotor 3 are respectively fixed to the housing 1 and the rotating shaft 31 to drive the rotating shaft 31 to rotate; the output end of the rotating shaft 31 is provided with a propeller 27; the outer ring of the propeller 27 is provided with a venturi 28, and the venturi 28 is fixed on the shell 1 through a connecting flow passage 30; the connecting flow passage 30 and the shell 1 can adopt an integrated design, and the abdomen part of the connecting flow passage is provided with a water inlet and a suction port; a fairing 29 is arranged in the venturi 28; a sealing assembly is arranged on the outer side of the bearing 6, the sealing assembly comprises a concave pole 7 and a convex pole 8, the concave pole 7 and a permanent magnet 9 are connected into a whole and are fixed on a rotating shaft 31 through a rotating ring 12; the end part of the rotating shaft 31 can be additionally provided with a shaft sleeve 24, and the concave pole 7 and the permanent magnet 9 can be fixed on the shaft sleeve 24 through the rotating ring 12 and indirectly fixed on the rotating shaft 31; the concave pole 7 is provided with a U-shaped groove, and the concave pole 7 is formed by pouring flexible materials such as silica gel, polytetrafluoroethylene and the like; the salient pole 8 is fixed in the end cover through a support ring 13, 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 10; the permanent magnet 9 is of an annular structure and is manufactured by splicing and combining fan-shaped permanent magnet tiles 91; the magnetic fluid 10 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 9, and a U-shaped sealing strip is formed between the salient pole 8 and the concave pole 7 by utilizing the static pressure balance principle of a U-shaped pipe; when the magnetic fluid generator runs, the rotor rotates to drive the concave pole 7 and the permanent magnet 9 to move, the concave pole 7 in a rotating state drives the magnetic fluid 10 to rotate, and the magnetic fluid 10 generates a radial outward centrifugal force; the magnetic fluid 10 is accumulated at the bottom of the groove under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 7 for driving the magnetic fluid 10 to rotate, a liquid carrying strip 11 is bonded on the recessed electrode 7, and the liquid carrying strip 11 is made of sponge; the outer end of the rotating ring 12 is provided with a separation plate 14, the separation plate 14 is fixed in an end cover, a U-shaped gap between the support ring 13 and the end cover, the separation plate 14 is filled with magnetic grease 16, it should be noted that the magnetic grease 16 is adsorbed on an outer magnetic pole under the action of the permanent magnet 9 and is not easy to leak out, when the rotating ring 12 rotates, the rotating ring 12 drives the magnetic grease 16 to generate centrifugal force, a sealing strip is formed in the U-shaped gap, an auxiliary sealing effect is achieved, and impurities can be effectively prevented from entering the U-shaped gap; the outer end of the isolation plate 14 is provided with a mud throwing ring 15, and the mud throwing ring 15 is fixed on the rotating shaft 31; and a protective cover 21 is arranged outside the mud throwing ring 15.

According to the principle of static pressure balance of fluid in the U-shaped pipe, when the sealing belt is in a static sealing state, the magnetic fluid 10 keeps balance under the action of a magnetic pole above the anode 7 of the concave pole; when there is no pressure difference between the two ends of the magnetic fluid 10, the height difference h of the liquid level at the two ends is zero, when the pressure at any end is increased, the magnetic fluid 10 will shift to the side with low pressure as a whole until the height difference h of the liquid level reaches a certain value, and a new balance is achieved under the action of magnetic force; when the sealing tape is in a dynamic sealing state, the magnetic fluid 10 is under the action of magnetic force and centrifugal force, the magnetic fluid and the centrifugal force are mutually superposed to provide a force field for balancing pressure difference, 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 failure is caused by the fact that the fluid is broken down due to the fact that the fluid is stretched and thinned under the influence of the centrifugal force in a high-speed state is avoided.

It should be noted that the permanent magnet 9 with an annular structure may be designed integrally, or may be formed by combining a plurality of permanent magnet tiles 91, so that the magnetic field is distributed more uniformly and is more convenient to install, the permanent magnet tiles 91 may be arranged in a staggered manner, and the processing cost for a large-diameter bearing may be greatly reduced.

Example two

As shown in fig. 7 to 8, a sealed electric jet pump propeller includes a housing 1 and a rotating shaft 31, the rotating shaft 31 is movably connected to a front end cover 5 and a rear end cover 4 at two ends of the housing through a bearing 6, a motor stator 2 and a motor rotor 3 are respectively fixed to the housing 1 and the rotating shaft 31, and the rotating shaft 31 is driven to rotate; the output end of the rotating shaft 31 is provided with a propeller 27; the outer ring of the propeller 27 is provided with a venturi 28, and the venturi 28 is fixed on the shell 1 through a connecting rod 32; a fairing 29 is arranged in the venturi 28; the shell 1 is also provided with an air pressure adjusting device, the air pressure adjusting device comprises a cylinder body 19 and a piston 18, two ends of the cylinder body 19 are provided with openings to communicate the inside of the propeller with the outside atmosphere, and the piston 18 is arranged in the cylinder body 19 and slides under the action of the internal and external pressure difference to balance the internal and external pressure difference; a sealing assembly is arranged on the outer side of the bearing 6, the sealing assembly comprises a concave pole 7 and a convex pole 8, the concave pole 7 and a permanent magnet 9 are connected into a whole and are fixed on a rotating shaft 31 through a rotating ring 12; the end part of the rotating shaft 31 can be additionally provided with a shaft sleeve 24, and the concave pole 7 and the permanent magnet 9 can be fixed on the shaft sleeve 24 through the rotating ring 12 and indirectly fixed on the rotating shaft 31; the concave pole 7 is provided with a U-shaped groove, and the concave pole 7 is formed by pouring flexible materials such as silica gel, polytetrafluoroethylene and the like; the salient pole 8 is fixed in the end cover through a support ring 13, 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 10; the permanent magnet 9 is of an annular structure and is manufactured by splicing and combining fan-shaped permanent magnet tiles 91; the magnetic fluid 10 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 9, and a U-shaped sealing strip is formed between the salient pole 8 and the concave pole 7 by utilizing the static pressure balance principle of a U-shaped pipe; when the magnetic fluid generator runs, the rotor rotates to drive the concave pole 7 and the permanent magnet 9 to move, the concave pole 7 in a rotating state drives the magnetic fluid 10 to rotate, and the magnetic fluid 10 generates a radial outward centrifugal force; the magnetic fluid 10 is accumulated at the bottom of the groove under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 7 for driving the magnetic fluid 10 to rotate, a liquid carrying strip 11 is bonded on the recessed electrode 7, and the liquid carrying strip 11 is made of sponge; the outer end of the rotating ring 12 is provided with a separation plate 14, the separation plate 14 is fixed in an end cover, a U-shaped gap between the support ring 13 and the end cover, the separation plate 14 is filled with magnetic grease 16, it should be noted that the magnetic grease 16 is adsorbed on an outer magnetic pole under the action of the permanent magnet 9 and is not easy to leak out, when the rotating ring 12 rotates, the rotating ring 12 drives the magnetic grease 16 to generate centrifugal force, a sealing strip is formed in the U-shaped gap, an auxiliary sealing effect is achieved, and impurities can be effectively prevented from entering the U-shaped gap; the outer end of the isolation plate 14 is provided with a mud throwing ring 15, and the mud throwing ring 15 is fixed on the rotating shaft 31; and a protective cover 21 is arranged outside the mud throwing ring 15.

It should be pointed out that this kind of electric pump spouts propeller makes full use of self good sealing performance, directly places the motor part in aqueous, need not extra motor cooling system, and in the course of advancing, most heat will be taken away to rivers, guarantees the normal operating of motor, also can integrate the propeller header with devices such as battery or driver if some needs.

EXAMPLE III

As shown in fig. 9 to 10, a propeller for a sealed electric jet pump includes a housing 1 and a rotating shaft 31, wherein the rotating shaft 31 is movably connected to a front end cover 5 and a rear end cover 4 at two ends of the housing through a bearing 6, and a motor stator 2 and a motor rotor 3 are respectively fixed on the housing 1 and the rotating shaft 31 to drive the rotating shaft 31 to rotate; the output end of the rotating shaft 31 is provided with a propeller 27; the outer ring of the propeller 27 is provided with a venturi 28, and the venturi 28 is fixed on the shell 1 through a connecting rod 32; a fairing 29 is arranged in the venturi 28; a sealing assembly is arranged on the outer side of the bearing 6, the sealing assembly comprises a concave pole 7 and a convex pole 8, and the concave pole 7 and a permanent magnet 9 are connected into a whole and fixed in an end cover; the concave pole 7 is provided with a U-shaped groove, and the concave pole 7 is formed by pouring flexible materials such as silica gel, polytetrafluoroethylene and the like; the salient pole 8 is directly fixed on the rotating shaft 31, 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 10; the permanent magnet 9 is in an annular structure, is magnetized by radiation and is a monopole radiation ring; the magnetic fluid 10 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 9, and a U-shaped sealing strip is formed between the salient pole 8 and the concave pole 7 by utilizing the static pressure balance principle of a U-shaped pipe; when the magnetic fluid generator runs, the rotor rotates to drive the concave pole 7 and the permanent magnet 9 to move, the concave pole 7 in a rotating state drives the magnetic fluid 10 to rotate, and the magnetic fluid 10 generates a radial outward centrifugal force; the magnetic fluid 10 is accumulated at the bottom of the groove under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the salient pole 8 for driving the magnetic fluid 10 to rotate, a liquid carrying bar 11 is bonded on the salient pole 8, and the liquid carrying bar 11 is made of sponge; in order to prevent the magnetic fluid from leaking out during severe vibration, the edge part of the concave pole 7 is slightly contacted with the salient pole 8 to form a closed space, and the magnetic fluid 10 is sealed in the closed space between the salient pole 8 and the concave pole 7; an isolation plate 14 is arranged on the outer side of the permanent magnet 9, and the isolation plate 14 is fixed on the end cover; the isolating plate 14 is provided with a rubber ring 17 which is slightly contacted with the rotating shaft to form a first seal for blocking silt and dust

It should be pointed out that, because the edge of the concave pole 7 slightly contacts with the convex pole 8 to form a closed space, when the external pressure changes, the edge contact part can form a first protection, if the first protection fails, a magnetic fluid sealing tape implements a second protection, and the sealing effect is ensured under the double action; and the bearings are wrapped by the two magnetic fluid sealing belts of the sealing assembly to form a closed space, the shell can be provided with a water inlet 25, the water inlet 25 opens the inner space of the propeller from the outside, so that liquid can enter the inside of the propeller, the two sides of the sealing bearing are under the same pressure, the two magnetic fluid sealing belts are subjected to the same pressure from the outside and are deflected inwards, gas in the closed space is compressed, the air pressure is increased, the pressure balance is finally realized, the liquid is prevented from entering the inside of the bearing, the self-adaptive sealing effect is realized, the bearing can not be subjected to the resistance of the liquid when moving, the power loss is reduced, and if the sealing assembly is used in seawater, the stator and the rotor are subjected to anticorrosion treatment such as protective coating, the contact with the seawater is avoided, and.

Example four

As shown in fig. 11 to 14, a propeller for a sealed electric jet pump includes a housing 1 and a rotating shaft 31, wherein the rotating shaft 31 is movably connected to a front end cover 5 and a rear end cover 4 at two ends of the housing through a bearing 6, and a motor stator 2 and a motor rotor 3 are respectively fixed to the housing 1 and the rotating shaft 31 to drive the rotating shaft 31 to rotate; the output end of the rotating shaft 31 is provided with a propeller 27; the outer ring of the propeller 27 is provided with a venturi 28, and the venturi 28 is fixed on the shell 1 through a connecting rod 32; a fairing 29 is arranged in the venturi 28; a sealing assembly is arranged on the outer side of the bearing 6, the sealing assembly comprises a concave pole 7 and a convex pole 8, the concave pole 7, a permanent magnet 9 and an exciter 23 are sequentially connected into a whole from inside to outside and are fixed in a retainer 20, and the retainer 20 is fixedly arranged in an installation groove of an end cover; the concave pole 7 is provided with a U-shaped groove, and the concave pole 7 is formed by pouring flexible materials such as silica gel, polytetrafluoroethylene and the like; the salient pole 8 is directly fixed on the rotating shaft 31, 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 10; the permanent magnet 9 is in an annular structure, is magnetized by radiation and is a monopole radiation ring; the magnetic fluid 10 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 9, and a U-shaped sealing strip is formed between the salient pole 8 and the concave pole 7 by utilizing the static pressure balance principle of a U-shaped pipe; when the magnetic fluid is operated, the rotor rotates to drive the salient poles 8 to move, the salient poles 8 in the rotating state drive the magnetic fluid 10 to rotate, and the magnetic fluid 10 generates a radial outward centrifugal force; the magnetic fluid 10 is accumulated at the bottom of the groove under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the concave pole 7 for driving the magnetic fluid 10 to rotate, liquid carrying strips 11 are bonded on the convex poles 8, and the liquid carrying strips 11 are made of sponge; stuffing boxes are arranged at two ends of the salient pole 8 and used for preventing impurities from entering the sealing belt; the outer end of the concave pole 7 is sequentially provided with a rotating ring 12, an isolating plate 14 and a mud throwing ring 15, wherein the rotating ring 12 and the mud throwing ring 15 are fixed on a rotating shaft, the isolating plate 14 is fixed in an end cover, a gap exists between the isolating plate and the end cover, lubricating grease 16 is filled in the gap between two side faces of the rotating ring 12, when the rotor rotates, the mud throwing ring 15 at the outermost side throws out dust particles in water by utilizing centrifugal force to play a role in protecting a first layer, and the lubricating grease 16 seals the top gap under the action of the centrifugal force of the rotating ring 12 to prevent fine particles from entering and form a second protection; the mud slinger 15 is externally provided with a protective cover 21.

It should be pointed out that the exciter 23 is in a ring structure, is arranged outside the permanent magnet 9, and is formed by combining an exciter post 23-1, a coil 23-2 and an exciter ring 23-3, the exciter post 23-1 wound with the coil 23-2 is uniformly distributed on the exciter ring 23-3, when the magnetic field generator works, the magnetic field generated by electrifying the coil 22-2 and the magnetic field of the permanent magnet are superposed in the same direction, so that the total intensity of the magnetic field applied on the magnetic fluid is enhanced along with the increase of the current, and the sealing performance of the propeller can be controlled according to the requirement; the end cover is provided with a lead groove 22 of a coil 23-2.

It should be noted that the exciter 23 may also be formed by combining a plurality of exciter units, where the exciter unit includes a pole 23-1, a coil 23-2 and a tile 23-4, and the pole 23-1 wound with the coil 23-2 is fixed on the tile 23-4.

EXAMPLE five

As shown in fig. 15 to 16, a propeller for a sealed electric jet pump includes a housing 1 and a rotating shaft 31, wherein the rotating shaft 31 is movably connected to a front end cover 5 and a rear end cover 4 at two ends of the housing through a bearing 6, and a motor stator 2 and a motor rotor 3 are respectively fixed to the housing 1 and the rotating shaft 31 to drive the rotating shaft 31 to rotate; the output end of the rotating shaft 31 is provided with a propeller 27; the outer ring of the propeller 27 is provided with a venturi 28, and the venturi 28 is fixed on the shell 1 through a connecting rod 32; a fairing 29 is arranged in the venturi 28; a sealing assembly is arranged on the outer side of the bearing 6, the sealing assembly comprises a concave pole 7 and a convex pole 8, and the concave pole 7 is fixed on a rotating shaft 31 through a rotating ring 12; the concave pole 7 is provided with a U-shaped groove, and the concave pole 7 is formed by pouring flexible materials such as silica gel, polytetrafluoroethylene and the like; the salient pole 8 is fixed in the end cover through a support ring 13, 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 10; the permanent magnet 9 is in an annular structure, adopts radiation magnetization, is a monopole radiation ring, is fixed in an end cover at the outer side of the concave pole 7, and has a gap with the concave pole 7; the magnetic fluid 10 overcomes the gravity and accumulates towards the bottom of the groove under the action of a radial magnetic field provided by the permanent magnet 9, and a U-shaped sealing strip is formed between the salient pole 8 and the concave pole 7 by utilizing the static pressure balance principle of a U-shaped pipe; when the magnetic fluid generating device runs, the rotor rotates to drive the concave pole 7 to move, the concave pole 7 in a rotating state drives the magnetic fluid 10 to rotate, and the magnetic fluid 10 generates a radial outward centrifugal force; the magnetic fluid 10 is accumulated at the bottom of the groove under the combined action of centrifugal force and magnetic force; in order to increase the capacity of the recessed electrode 7 for driving the magnetic fluid 10 to rotate, a liquid carrying strip 11 is bonded on the recessed electrode 7, and the liquid carrying strip 11 is made of sponge; an isolation plate 14 is arranged at the outer end of the rotating ring 12, the isolation plate 14 is fixed in an end cover, and magnetic lubricating grease 16 is filled in gaps among the support ring 13, the rotating ring 12 and the permanent magnet 9; the outer end of the isolation plate 14 is provided with a mud throwing ring 15, and the mud throwing ring 15 is fixed on the rotating shaft 31; and a protective cover 21 is arranged outside the mud throwing ring 15.

It should be pointed out that, at this time, the inner side and the outer side of the concave pole 7 both form a "U" shaped sealing band, when the concave pole 7 rotates, the inner and outer sealing bands resist external pressure difference under the same direction superposition of centrifugal force and magnetic force, and sealing performance is dually ensured; the rotating ring 12 is preferably made of a magnetic conductive material so as to reduce magnetic leakage and indirectly improve the magnetic force of the permanent magnet 4 on the magnetic fluid 2; disregarding cost, magnetic grease 16 may be replaced with magnetic fluid 10.

It is necessary to supplement that, the sealing assembly makes the inner space of the propeller be in a closed state, in order to increase the sealing performance of the sealed electric jet pump propeller, the inner space can be filled with insulating liquid, preferably insulating oil 26, to exhaust the gas in the inner space, when the external pressure of the sealing assembly changes, the strong compression resistance of the inner liquid makes the liquid level difference of the sealing strip not change basically, and ensures the high-strength sealing effect, and the insulating liquid can also play a role in lubricating the moving part and dissipating heat.

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.