Axial flux electric pump

Abstract

The invention relates to an axial flux electric pump. An axial magnetic flux electric pump having an axially symmetrical structure includes: a stator assembly configured to generate an axial magnetic flux; the rotor driver assembly and the stator assembly are coaxially arranged, the rotor driver assembly can rotate around the axis under the action of the axial magnetic flux, and when the axial magnetic flux electric pump works, the rotor driver assembly drives fluid and bears opposite fluid acting force; wherein the axial symmetrical structure is realized by one of the following two modes: the stator assembly comprises a first stator and a second stator which are respectively positioned on two axial sides of the rotor driver assembly; or, the rotor driver assembly comprises a first rotor driver and a second rotor driver which are located on the two axial sides of the stator assembly respectively.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 202410071153.9 and the invention title "Axial Flux Electric Pump" filed on January 17, 2024, the entire content of which is incorporated herein by reference. Technical Field

[0002] The present invention relates to the field of electric pumps, and more particularly, to an axial flux electric pump. Background Art

[0003] In the automotive field, the application of electric water pumps is becoming increasingly widespread. In the traditional automotive field, due to the need to reduce fuel consumption, electric water pumps are gradually replacing mechanical water pumps to pump coolant for the engine cooling system. In the new energy vehicle field, electric water pumps provide circulating cooling for key components such as drive motors and power batteries.

[0004] For existing axial flux rotor-driven electric water pumps, the fluid agitator is located on one side of the stator. During operation, there is always an imbalance between the axial magnetic force and the axial thrust generated by the liquid pressure. Therefore, this will cause frictional losses, reduce the pump efficiency of the electric water pump, shorten the bearing life, and generate additional noise. Summary of the Invention

[0005] The purpose of the present invention is to provide an axial flux electric pump with reduced axial resultant force.

[0006] The present invention provides an axial flux electric pump. The axial flux electric pump has an axially symmetric structure, including:

[0007] A stator assembly configured to generate an axial magnetic flux; and

[0008] A rotor drive assembly coaxially arranged with the stator assembly, configured to be able to rotate around an axis under the action of the axial magnetic flux, and when the axial flux electric pump operates, drive the fluid and be subjected to an opposite fluid acting force;

[0009] Wherein, the axially symmetric structure is realized by one of the following two methods:

[0010] The stator assembly includes a first stator and a second stator respectively located on the axial two sides of the rotor drive assembly; or,

[0011] The rotor drive assembly includes a first rotor drive and a second rotor drive respectively located on the axial two sides of the stator assembly.

[0012] According to an embodiment of the present invention, the axial flux electric pump includes:

[0013] A housing, the housing is provided with a first fluid inlet, a second fluid inlet and a fluid outlet, the first fluid inlet and the second fluid inlet respectively correspond to the two axial sides of the rotor drive assembly, and the rotor drive assembly is configured to drive fluid from the first fluid inlet and the second fluid inlet to the fluid outlet.

[0014] According to an embodiment of the present invention, the rotor drive assembly includes:

[0015] A base, configured to be able to rotate around the axis;

[0016] Permanent magnets, a plurality of permanent magnets are provided, and the plurality of permanent magnets are fixed on both axial sides of the base;

[0017] A fluid agitating member, connected to the outer peripheral surface of the base.

[0018] According to an embodiment of the present invention, a shaft body is provided inside the housing;

[0019] The first stator is provided with a first central hole, the second stator is provided with a second central hole, and the first central hole and the second central hole are fixedly sleeved on the outer peripheral surface of the shaft body;

[0020] The base is provided with a third central hole, a bearing is provided in the third central hole, and the bearing is sleeved on the outer peripheral surface of the shaft body.

[0021] According to an embodiment of the present invention, a sleeve extending axially towards both sides is provided in the middle of the base, and the hollow part of the sleeve constitutes the third central hole.

[0022] According to an embodiment of the present invention, the rotor drive assembly further includes:

[0023] A first cover plate, covering the first side in the axial direction of the base, the permanent magnet includes a first permanent magnet provided on the first side of the base, and the first permanent magnet is covered by the first cover plate;

[0024] A second cover plate, covering the second side in the axial direction of the base, the permanent magnet includes a second permanent magnet provided on the second side of the base, and the second permanent magnet is covered by the second cover plate.

[0025] According to an embodiment of the present invention, a first cavity is provided between the first stator and the second stator and the fluid agitating member;

[0026] A second cavity is provided between the first stator and the first cover plate, and between the second stator and the second cover plate;

[0027] A third cavity is further provided in the middle of the first stator and the second stator,

[0028] The first cavity, the second cavity and the third cavity are communicated in sequence.

[0029] According to an embodiment of the present invention, both the first stator and the second stator include a stator core, a winding and an insulating frame, and the winding is disposed on the stator core through the insulating frame.

[0030] According to an embodiment of the present invention, the axial flux electric pump includes a housing, and the housing is provided with a first fluid inlet, a second fluid inlet and a fluid outlet.

[0031] The first rotor driver is configured to drive the fluid from the first fluid inlet to the fluid outlet, and the second rotor driver is configured to drive the fluid from the second fluid inlet to the fluid outlet.

[0032] According to an embodiment of the present invention, the first rotor driver includes a first mechanical driving element and a plurality of third permanent magnets, and the third permanent magnets are embedded in the first mechanical driving element, and

[0033] The second rotor driver includes a second mechanical driving element and a plurality of fourth permanent magnets, and the fourth permanent magnets are embedded in the second mechanical driving element.

[0034] According to an embodiment of the present invention, the axial flux electric pump further includes:

[0035] A shaft body, which can rotate around the axis and has a flow channel axially penetrating through itself.

[0036] The stator assembly has a stator cavity axially penetrating through itself, the first rotor driver has a first rotor cavity axially penetrating through itself, the second rotor driver has a second rotor cavity axially penetrating through itself, the shaft body is located in the first rotor cavity, the stator cavity and the second rotor cavity, and

[0037] The first fluid inlet is communicated with the second fluid inlet through the flow channel.

[0038] For the axial flux electric pump provided by the present invention, because it is an axially symmetric structure, when the axial flux electric pump works, the rotor driver assembly is subjected to opposite fluid acting forces, so that at least a part of the fluid acting forces can be offset from each other, reducing the axial resultant force. Furthermore, the problem of imbalance caused by the rotor driver being subjected to a unidirectional axial force and resulting in frictional loss can be avoided. Description of the Drawings

[0039] Figure 1 is a cross-sectional view showing an axial flux electric pump according to a first embodiment of the present invention.

[0040] Figure 2 is Figure 1 a cross-sectional view of a rotor drive.

[0041] Figure 3 is Figure 1 a cross-sectional view of a first stator.

[0042] Figure 4 is a cross-sectional view showing an axial flux electric pump according to a second embodiment of the present invention.

[0043] Figure 5 is Figure 4 a partially enlarged cross-sectional view of an axial flux electric pump.

[0044] Figure 6 is Figure 4 an exploded perspective view of an axial flux electric pump. Detailed Description of the Invention

[0045] Specific embodiments of the present invention will be described below with reference to the accompanying drawings. The following detailed description and the drawings are used to exemplarily illustrate the principles of the present invention. The present invention is not limited to the described preferred embodiments, and the protection scope of the present invention is defined by the claims.

[0046] It should be noted that the directions or positional relationships indicated in this specification are based on the directions or positional relationships shown in the drawings, and are only for convenience and simplification of description, rather than indicating or implying that the device referred to must have a specific direction and be constructed in a specific direction. Therefore, it should not be construed as a limitation to the present invention.

[0047] The axial flux electric pump is used to pump water or coolant for cooling, for example, an engine, a drive motor, etc. In the axial flux electric pump, the magnetic flux extends in the axial direction. The axial flux electric pump can be a vane pump. However, those skilled in the art should understand that the present invention is not limited thereto, and the axial flux electric pump can be any electric pump capable of generating axial flux, for example, a cycloidal pump, a turbine pump.

[0048] The axial flux electric pump has an axially symmetric structure and includes a stator assembly and a rotor drive assembly coaxially arranged with the stator assembly. The stator assembly is configured to generate axial flux. The rotor drive assembly is configured to be able to rotate around the axis under the action of the axial flux, and when the axial flux electric pump is operating, it drives the fluid and is subjected to an opposite fluid force.

[0049] The axially symmetric structure can be implemented through two embodiments respectively. In the first embodiment, the stator assembly includes a first stator and a second stator respectively located on the two axial sides of the rotor drive assembly. In the second embodiment, the rotor drive assembly includes a first rotor drive and a second rotor drive respectively located on the two axial sides of the stator assembly.

[0050] Since the axial flux electric pump has an axially symmetric structure, when the axial flux electric pump operates, the rotor drive assembly is subjected to opposite fluid forces. Therefore, at least a part of the fluid forces can be offset from each other, reducing the axial resultant force. Furthermore, it can avoid the problem of imbalance caused by the unidirectional axial force on the rotor drive, resulting in frictional losses.

[0051] Figures 1 to 3 An axial flux electric pump according to the first embodiment is shown. As Figures 1 to 3 shown, the axial flux electric pump has an axially symmetric structure and includes a first stator 11, a second stator 12, and a rotor drive assembly 13.

[0052] Among them, the first stator 11 is configured to generate a first axial flux, and the second stator 12 is configured to generate a second axial flux. The rotor drive assembly 13 is coaxially arranged with the first stator 11 and the second stator 12, and the first stator 11 and the second stator 12 are respectively located on the two axial sides of the rotor drive assembly 13.

[0053] The rotor drive assembly 13 is configured to be able to rotate around the axis under the combined action of the first axial flux and the second axial flux. When the axial flux electric pump operates, under the combined action of the first axial flux and the second axial flux, the rotor drive assembly 13 rotates around the axis, and the rotor drive assembly 13 rotates to drive the fluid to flow. At the same time, the rotor drive assembly 13 is subjected to opposite fluid forces.

[0054] The axial force directions of the first axial flux and the second axial flux received by the rotor drive assembly 13 are opposite, and are preferably set to be opposite in direction and equal in magnitude.

[0055] For the axial flux electric pump provided in this embodiment, since its rotor drive assembly 13 is coaxially arranged with the first stator 11 and the second stator 12, and the first stator 11 and the second stator 12 are respectively located on the axial two sides of the rotor drive assembly 13. The axial magnetic forces of the first stator 11 and the second stator 12 acting on the rotor drive assembly 13 are in opposite directions, and thus at least a part of them can cancel each other out, reducing the axial resultant force. Therefore, it is beneficial to form a water film on the bearing 137, reduce the frictional loss of the bearing 137, and improve the efficiency. And this can ultimately improve the noise, vibration, harshness (NVH, Noise Vibration Harshness) and durability problems of the bearing 137. In addition, since the pump has two stator assemblies, the power density is high, improving the overall efficiency of the pump.

[0056] In a further embodiment, the axial flux electric pump includes a housing 14, and the first stator 11, the second stator 12 and the rotor drive assembly 13 are all arranged inside the housing 14.

[0057] The housing 14 is provided with a first fluid inlet 161, a second fluid inlet 162 and a fluid outlet 163. The first fluid inlet 161 and the second fluid inlet 162 respectively correspond to the axial two sides of the rotor drive assembly 13. The rotor drive assembly 13 is configured to drive the fluid from the first fluid inlet 161 and the second fluid inlet 162 to the fluid outlet 163.

[0058] When the axial flux electric pump works, the rotor drive assembly 13 rotates to drive the fluid from the first fluid inlet 161 and the second fluid inlet 162 to the fluid outlet 163 respectively. Since the first fluid inlet 161 and the second fluid inlet 162 respectively correspond to the axial two sides of the rotor drive assembly 13, the fluid acting forces on the two axial sides of the rotor drive assembly 13 are basically equal in magnitude and opposite in direction. Therefore, the axial acting forces of the fluid on the rotor drive assembly 13 can basically cancel each other out, and the problem of imbalance caused by the axial force on the rotor drive assembly 13 and resulting in frictional loss can also be avoided.

[0059] In some embodiments, the housing 14 may include a first half-shell 141 and a second half-shell 142. The first half-shell 141 and the second half-shell 142 are hermetically butted to form a housing 14 with a cavity. Among them, the first fluid inlet 161 may be provided on the first half-shell 141, the second fluid inlet 162 is provided on the second half-shell 142, and a fluid outlet 163 is formed at the butting position after the first half-shell 141 and the second half-shell 142 are butted.

[0060] In some embodiments, the rotor drive assembly 13 includes a base body 131, permanent magnets 132, and a fluid agitator 133. Among them, the base body 131 is configured to be rotatable about an axis. Specifically, the base body 131 may have a circular plate-like structure, and a shaft hole is provided at the center of the base body 131. The shaft hole is engaged with the shaft through a bearing 137, so that the base body 131 can rotate around the shaft.

[0061] A plurality of permanent magnets 132 are provided, and the plurality of permanent magnets 132 are fixed on both axial sides of the base body 131. A plurality of permanent magnets 132 are provided on each axial side of the base body 131. The permanent magnets 132 are moved under the magnetic force of the stator assembly.

[0062] The fluid agitator 133 is connected to the outer peripheral surface of the base body 131. Specifically, the fluid agitator 133 is provided with a central hole, and the base body 131 can be sleeved in the central hole of the fluid agitator 133 and fixedly connected.

[0063] In some embodiments, a shaft body 15 is provided inside the housing 14. Specifically, a first shaft seat 171 may be provided at a position inside the housing 14 close to the first fluid inlet 161, and a second shaft seat 172 may be provided at a position inside the housing 14 close to the second fluid inlet 162. Both ends of the shaft body 15 are respectively fixed on the first shaft seat 171 and the second shaft seat 172.

[0064] The first stator 11 is provided with a first central hole, and the second stator 12 is provided with a second central hole. The first central hole and the second central hole are fixedly sleeved on the outer peripheral surface of the shaft body 15. The base body 131 is provided with a third central hole, and a bearing 137 is provided in the third central hole. The bearing 137 is sleeved on the outer peripheral surface of the shaft body 15.

[0065] Since the thickness of the plate-like base body 131 is small and it is not convenient to install the bearing 137. In view of this, in order to facilitate the installation of the bearing 137, a sleeve 136 extending axially from the middle of the base body 131 to both sides thereof is provided, and the hollow portion of the sleeve 136 constitutes the above-mentioned third central hole.

[0066] The rotor drive assembly 13 further includes a first cover plate 134 and a second cover plate 135, which respectively cover the first side and the second side of the base body 131 in the axial direction. The permanent magnets 132 include a first permanent magnet 1321 and a second permanent magnet 1322. The first permanent magnet 1321 and the second permanent magnet 1322 are respectively provided on the first side and the second side of the base body 131, and the first permanent magnet 1321 and the second permanent magnet 1322 are respectively covered by the first cover plate 134 and the second cover plate 135.

[0067] Specifically, the first cover plate 134 and the second cover plate 135 can be of an annular structure. The inner ring edges of the first cover plate 134 and the second cover plate 135 are in airtight contact with the outer side wall of the above-mentioned sleeve 136. The outer ring edges of the first cover plate 134 and the second cover plate 135 are provided with flanges that fold towards the base body 131, and the flanges are in airtight contact with the axial side surfaces of the base body 131. In this way, the first cover plate 134 and the second cover plate 135 can seal the first permanent magnet 1321 and the second permanent magnet 1322 inside them, preventing fluid from entering the inside of the first cover plate 134 and the second cover plate 135 and causing pollution to the permanent magnet 132.

[0068] In a further embodiment, a first cavity 181 is provided between each of the first stator 11 and the second stator 12 and the fluid stirring member 133. The first cavity 181 can extend axially, and the fluid in the housing 14 can enter the first cavity 181.

[0069] A second cavity 182 is provided between the first stator 11 and the first cover plate 134 and between the second stator 12 and the second cover plate 135.

[0070] A third cavity 183 is further provided in the middle of the first stator 11 and the second stator 12, and the first cavity 181, the second cavity 182, and the third cavity 183 are communicated in sequence.

[0071] With such an arrangement, the fluid can enter the first cavity 181, the second cavity 182, and the third cavity 183. Furthermore, both sides of the first stator 11 and the second stator 12 can be subjected to the heat exchange effect of the fluid, which helps to dissipate the heat of the stator.

[0072] In some embodiments, both the first stator 11 and the second stator 12 include a stator core 111, a winding 112, and an insulating frame 113. The winding 112 is arranged on the stator core 111 through the insulating frame 113.

[0073] The first stator 11 and the second stator 12 have the same structure, and the first stator 11 and the second stator 12 are symmetrically arranged with respect to the rotor drive assembly 13. With such an arrangement, the first axial magnetic flux and the second axial magnetic flux generated by the first stator 11 and the second stator 12 are equal. Furthermore, the axial force directions of the first axial magnetic flux and the second axial magnetic flux received by the rotor drive assembly 13 are opposite and the magnitudes are equal.

[0074] Figures 4 to 6 An axial flux electric pump showing a second embodiment of the present invention is as Figures 4 to 6As shown, the axial flux electric pump has an axially symmetric structure and includes a stator assembly 1, a first rotor driver 2, and a second rotor driver 3. The stator assembly 1 is configured to generate an axial magnetic flux. The first rotor driver 2 and the second rotor driver 3 are coaxially arranged with the stator assembly 1 and are respectively located on the two axial sides of the stator assembly 1. The first rotor driver 2 and the second rotor driver 3 are configured to be able to rotate simultaneously around the axis under the action of the axial magnetic flux, and when the axial flux electric pump is operating, drive the fluid and receive opposite fluid forces.

[0075] The axial flux electric pump has an axially symmetric structure. The first rotor driver 2 and the second rotor driver 3 are respectively arranged on the two axial sides of the stator assembly 1 and receive opposite fluid forces during operation. Therefore, at least a part of the fluid forces on both sides of the pump can cancel each other out. In addition, the two sides of the entire rotor driver assembly 13 receive opposite axial magnetic fluxes. Therefore, at least a part of the axial force can be cancelled out. Thus, the resultant axial force received is reduced, and the problem that the rotor driver assembly 13 is unbalanced due to the axial force and causes frictional losses can be avoided.

[0076] The axial flux electric pump further includes a housing 14. The housing 14 has a first side end cover 41, a body 43, and a second side end cover 42. The first side end cover 41 and the second side end cover 42 are respectively connected to the two axial sides of the body 43, so as to form a receiving cavity for receiving the stator assembly 1, the first rotor driver 2, and the second rotor driver 3, playing a role in protecting the internal components of the pump. The receiving cavity is divided by the stator assembly 1 into a first receiving cavity for receiving the first rotor driver 2 and a second receiving cavity for receiving the second rotor driver 3. The first side end cover 41 and the second side end cover 42 may have the same structure.

[0077] The stator assembly 1 is a stationary component in the pump and includes a plurality of stator cores 111, a plurality of windings 112, and a receiving member 115. The stator cores 111 may be formed by laminating steel sheets or silicon steel sheets to increase the magnetic permeability of the magnetic circuit. The windings 112 are wound around the stator cores 111 to generate an axial magnetic field. The plurality of stator cores 111 and the plurality of windings 112 are integrally formed into a ring shape. Correspondingly, the receiving member 115 has a ring-shaped receiving space for receiving the stator cores 111 and the windings 112. In addition, the stator assembly 1 also has a stator cavity axially penetrating itself. Specifically, the stator cavity is formed in the receiving member 115. For example, the receiving member 115 is made of plastic. The shaft body 15 is supported in the stator cavity in a rotatable manner around the axis through a stator bearing 114. For example, the stator bearing 114 is a graphite bearing.

[0078] The first rotor driver 2 is a moving component within the pump and includes a first mechanical drive element 22 and a plurality of third permanent magnets 21. The plurality of third permanent magnets 21 are embedded within the first mechanical drive element 22. When current passes through the windings 112 of the stator assembly 1, the magnetic field generated by the windings 112 causes the third permanent magnets 21 of the first rotor driver 2 to be subjected to a force, thereby driving the first mechanical drive element 22 connected to the third permanent magnets 21 to rotate. Compared with the scheme where the mechanical drive element and the magnet are arranged axially, the scheme where the permanent magnet is embedded in the mechanical drive element reduces the number of parts of the pump and decreases the axial dimension of the pump, thus making the structure compact.

[0079] The first mechanical drive element 22 includes a first main body 221, a first bushing 222, and a first soft magnetic body 223. The first main body 221 is configured as a disc-shaped structure and has an annular cavity facing the stator assembly 1. The first bushing 222 is integrally annular and is located within the annular cavity. The third permanent magnets 21 are configured as fan-shaped. Correspondingly, a plurality of fan-shaped spaces facing the stator assembly 1 are formed on the first bushing 222 and are distributed circumferentially. The plurality of third permanent magnets 21 are respectively received within the plurality of fan-shaped spaces of the first bushing 222. For example, the first bushing 222 is made of plastic. The first soft magnetic body 223 is integrally annular, is located within the annular cavity, and covers the plurality of third permanent magnets 21.

[0080] The first rotor driver 2 has a first rotor cavity that axially penetrates itself. Specifically, the first rotor cavity is formed on the first main body 221 and has a stepped inner surface. As Figure 1 shown, the shaft body 15 axially overlaps with a part of the first rotor cavity. The shaft body 15 is non-rotatably supported within the first rotor cavity by a first shaft sleeve 23. The outer surface of the first shaft sleeve 23 has an interference fit with the first rotor cavity, and its inner surface has an interference fit with the shaft body 15. When the shaft body 15 rotates, the first rotor driver 2 rotates together with the shaft body 15. For example, the first shaft sleeve 23 is made of metal. The first main body 221 can be injection molded.

[0081] The second rotor driver 3 is a moving component within the pump and includes a second mechanical drive element 32 and a plurality of fourth permanent magnets 31. The plurality of fourth permanent magnets 31 are embedded within the second mechanical drive element 32. When current passes through the windings 112 of the stator assembly 1, the magnetic field generated by the windings 112 causes the fourth permanent magnets 31 of the second rotor driver 3 to be subjected to a force, thereby driving the second mechanical drive element 32 connected to the fourth permanent magnets 31 to rotate. Compared with the scheme where the mechanical drive element and the magnet are arranged axially, the scheme where the magnet is embedded in the mechanical drive element reduces the number of parts of the pump and decreases the axial dimension of the pump, thus making the structure compact.

[0082] The second mechanical drive element 32 includes a second main body 321, a second bushing 322, and a second soft magnetic body 323. The second main body 321 is configured as a disc-shaped structure and has an annular cavity facing the stator assembly 1. The second bushing 322 is integrally annular and is located within the annular cavity. The fourth permanent magnet 31 is configured as a sector shape. Correspondingly, a plurality of sector-shaped spaces facing the stator assembly 1 and distributed circumferentially are formed on the second bushing 322. The plurality of fourth permanent magnets 31 are respectively received in the plurality of sector-shaped spaces of the second bushing 322. For example, the second bushing 322 is made of plastic. The second soft magnetic body 323 is integrally annular, is located within the annular cavity, and covers the plurality of fourth permanent magnets 31.

[0083] The second rotor driver 3 has a second rotor cavity axially penetrating therethrough. Specifically, the second rotor cavity is formed on the second main body 321, and the second rotor cavity has a stepped inner surface. As Figure 1 shown, the shaft body 15 axially overlaps a part of the second rotor cavity. The shaft body 15 is supported in the second rotor cavity by a second bushing 33. The outer surface of the second bushing 33 is in interference fit with the second rotor cavity, and its inner surface is in interference fit with the shaft body 15. When the shaft body 15 rotates, the second rotor driver 3 rotates together with the shaft body 15. For example, the second bushing 33 is made of metal. The second main body 321 can be injection molded.

[0084] Since the first rotor driver 2 and the second rotor driver 3 are respectively arranged on the two axial sides of the stator assembly 1 and are subjected to opposite fluid forces during operation, part of the axial magnetic force and fluid force on both sides of the pump can cancel each other out, reducing the axial resultant force. Therefore, it is beneficial to form a water film on the bearing, reduce the frictional loss of the bearing, and improve the efficiency. And this can ultimately improve the noise, vibration, noise, vibration, harshness (NVH), and durability problems of the bearing. In addition, since the pump has two rotor drivers, the power density is high, improving the overall efficiency of the pump.

[0085] The first rotor driver 2 and the second rotor driver 3 have the same structure. That is to say, the first rotor driver 2 and the second rotor driver 3 are the same type of rotor driver and have the same shape, structure, and size. Thus, the axial resultant force can be further reduced. For example, the first rotor driver 2 and the second rotor driver 3 can be fluid agitation members, such as impellers, turbines, gears, etc.

[0086] The first rotor driver 2 and the second rotor driver 3 are symmetrically arranged with respect to the stator assembly 1. That is to say, the first rotor driver 2 and the second rotor driver 3 have the same positional relationship with respect to the stator assembly 1. Thus, the axial resultant force can be further reduced.

[0087] The axial flux electric pump can be designed to have an axisymmetric structure with respect to the center line passing through the center of the stator assembly 1 and perpendicular to the axis, so that the axial component forces on both sides of the pump can be completely offset. Therefore, in addition to the above advantages, the axial flux electric pump according to the embodiments of the present invention can also eliminate the thrust bearing used in the prior art to balance the axial force.

[0088] The housing 14 is provided with a first fluid inlet 161, a second fluid inlet 162 and a fluid outlet 163. The first rotor driver 2 is configured to drive the fluid from the first fluid inlet 161 to the fluid outlet 163, and the second rotor driver 3 is configured to drive the fluid from the second fluid inlet 162 to the fluid outlet 163. Since the axial flux electric pump is provided with two fluid inlets, it is easier to dissipate heat compared to the axial flux electric pump with a single fluid inlet, and there is no need for additional pipes for cooling, thereby reducing the number of components of the pump.

[0089] The first fluid inlet 161 and the second fluid inlet 162 are arranged in the axial direction, and the fluid outlet 163 is arranged in the radial direction. However, it should be understood that the arrangement positions of the first fluid inlet 161, the second fluid inlet 162 and the fluid outlet 163 are not limited thereto, and can be selected according to the type of the axial flux electric pump. For example, for a vortex pump, the first fluid inlet 161, the second fluid inlet 162 and the fluid outlet 163 are all arranged in the radial direction.

[0090] The first fluid inlet 161 is communicated with the second fluid inlet 162, that is to say, the first accommodation cavity and the second accommodation cavity are in through connection. The through connection of the two cavities can balance the pressure difference between the two accommodation cavities. If the pressures in the two cavities are the same, the fluid will not flow between the two cavities. If there is some difference in pressure, the fluid will flow between the two cavities, thereby balancing the pressures in the two cavities and achieving dynamic force balance.

[0091] In one embodiment, the shaft body 15 has a flow channel 15a axially penetrating through itself, and the first fluid inlet 161 is communicated with the second fluid inlet 162 through the flow channel 15a.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0093] Description of reference numerals:

[0094] 1. Stator assembly; 11. First stator; 111. Stator core; 112. Winding; 113. Insulating frame; 114. Stator bearing;

[0095] 2. First rotor driver; 21. Third permanent magnet; 22. First mechanical drive element; 221. First body; 222. First bushing; 223. First soft magnetic body; 23. First sleeve;

[0096] 3. Second rotor driver; 31. Fourth permanent magnet; 32. Second mechanical drive element; 321. Second body; 322. Second bushing; 323. Second soft magnetic body; 33. Second sleeve;

[0097] 12. Second stator; 13. Rotor driver assembly; 131. Substrate; 132. Permanent magnet; 1321. First permanent magnet; 1322. Second permanent magnet; 133. Fluid agitator; 134. First cover plate; 135. Second cover plate; 136. Sleeve; 137. Bearing;

[0098] 14. Housing; 141. First half shell; 142. Second half shell; 41. First side end cover; 42. Second side end cover; 43. Body;

[0099] 15. Shaft body; 15a. Flow channel;

[0100] 161. First fluid inlet; 162. Second fluid inlet; 163. Fluid outlet; 171. First shaft seat; 172. Second shaft seat; 181. First cavity; 182. Second cavity; 183. Third cavity.

Claims

1. An axial flux electric pump having an axially symmetric structure, comprising: A stator assembly (1) configured to generate an axial magnetic flux; And A rotor drive assembly (13) coaxially arranged with the stator assembly (1), configured to be able to rotate about an axis under the action of the axial magnetic flux, and when the axial flux electric pump is operating, drive a fluid and be subjected to an opposite fluid force; Wherein, the axially symmetric structure is achieved by one of the following two methods: The stator assembly (1) includes a first stator (11) and a second stator (12) respectively located on the axial two sides of the rotor drive assembly (13); or, The rotor drive assembly (13) includes a first rotor drive (2) and a second rotor drive (3) respectively located on the axial two sides of the stator assembly (1).

2. The axial flux electric pump according to claim 1, wherein, The axial flux electric pump includes: A housing (14), the housing (14) is provided with a first fluid inlet (161), a second fluid inlet (162) and a fluid outlet (163), the first fluid inlet (161) and the second fluid inlet (162) respectively correspond to the axial two sides of the rotor drive assembly (13), and the rotor drive assembly (13) is configured to drive the fluid from the first fluid inlet (161) and the second fluid inlet (162) to the fluid outlet (163).

3. The axial flux electric pump according to claim 2, wherein, The rotor drive assembly (13) includes: A base body (131) configured to be able to rotate about the axis; Permanent magnets (132), provided in a plurality, and the plurality of permanent magnets (132) are fixed on both axial sides of the base body (131); A fluid agitator (133) connected to the outer peripheral surface of the base body (131).

4. The axial flux electric pump according to claim 3, wherein, A shaft body (15) is provided inside the housing (14); The first stator (11) is provided with a first central hole, the second stator (12) is provided with a second central hole, and the first central hole and the second central hole are fixedly sleeved on the outer peripheral surface of the shaft body (15); The base body (131) is provided with a third central hole, a bearing (137) is provided in the third central hole, and the bearing (137) is sleeved on the outer peripheral surface of the shaft body (15).

5. The axial flux electric pump according to claim 4, wherein, A sleeve (136) extending axially towards both sides thereof is provided in the middle of the base body (131), and the hollow part of the sleeve (136) constitutes the third central hole.

6. The axial flux electric pump according to claim 5, wherein, The rotor drive assembly (13) further includes: A first cover plate (134) covering the first axial side of the base body (131), the permanent magnet (132) includes a first permanent magnet (1321) provided on the first side of the base body (131), and the first permanent magnet (1321) is covered by the first cover plate (134); A second cover plate (135) covers the second side of the base body (131) in the axial direction. The permanent magnet (132) includes a second permanent magnet (1322) disposed on the second side of the base body (131), and the second permanent magnet (1322) is covered by the second cover plate (135).

7. The axial flux electric pump according to claim 6, wherein, A first cavity (181) is provided between each of the first stator (11) and the second stator (12) and the fluid stirring member (133). A second cavity (182) is provided between the first stator (11) and the first cover plate (134) and between the second stator (12) and the second cover plate (135). A third cavity (183) is further provided in the middle of the first stator (11) and the second stator (12). The first cavity (181), the second cavity (182), and the third cavity (183) are communicated in sequence.

8. The axial flux electric pump according to claim 1, wherein Each of the first stator (11) and the second stator (12) includes a stator core (111), a winding (112), and an insulating frame (113). The winding (112) is disposed on the stator core (111) through the insulating frame (113).

9. The axial flux electric pump according to claim 1, wherein the axial flux electric pump includes a housing (14). The housing (14) is provided with a first fluid inlet (161), a second fluid inlet (162), and a fluid outlet (163). The first rotor driver (2) is configured to drive the fluid from the first fluid inlet (161) to the fluid outlet (163), and the second rotor driver (3) is configured to drive the fluid from the second fluid inlet (162) to the fluid outlet (163).

10. The axial flux electric pump according to claim 1, wherein the first rotor driver (2) includes a first mechanical driving element (22) and a plurality of third permanent magnets (21). The third permanent magnets (21) are embedded in the first mechanical driving element (22), and the second rotor driver (3) includes a second mechanical driving element (32) and a plurality of fourth permanent magnets (31). The fourth permanent magnets (31) are embedded in the second mechanical driving element (32).

11. The axial flux electric pump according to claim 9, further comprising:[[]] a shaft body (15) that can rotate around the axis and has a flow channel (15a) axially penetrating through itself. The stator assembly (1) has a stator cavity axially penetrating through itself. The first rotor driver (2) has a first rotor cavity axially penetrating through itself. The second rotor driver (3) has a second rotor cavity axially penetrating through itself. The shaft body (15) is located in the first rotor cavity, the stator cavity, and the second rotor cavity, and the first fluid inlet (161) is communicated with the second fluid inlet (162) through the flow channel (15a).

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