Double-axial-flow fan and vehicle
By using a combination of conductor ring and brushes in a dual-rotor permanent magnet motor, the problem of flying conductors is solved, safety is improved, and the convex is achieved through one motor, reducing hardware costs.
Patent Information
- Application Number
- CN202420616546.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-03-27
AI Technical Summary
Existing dual-rotor permanent magnet motors are prone to fly wires when the wire is energized, which affects safety and cannot use the shaft to hide the wires.
Using a combination of conductor ring and brush, the conductor ring sleeve is arranged on the mounting shaft and corresponding to the winding. The brush realizes the electrical connection between the winding and the conductor ring. The current is sent to the winding through the conductor ring and the brush, generating a rotating magnetic field to interact with the permanent magnet, and achieving reverse rotation of the inner rotor and the outer rotor.
The risk of external wiring harness being exposed between the outer rotor and the inner rotor is avoided, and the safety of use is improved, and the convex is achieved through a dual rotor motor, significantly reducing hardware costs.
Smart Images
Figure CN222735973U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of motor technology, and in particular to a dual axial flow fan and a vehicle. Background Art
[0002] Dual-axial flow fans generally use two motors to drive the two fans respectively, or use a dual-rotor motor to drive the two fans. The dual-rotor motor has two rotors and shafts with independent speeds, which can realize dual-axis independent drive. Therefore, it has broad application prospects in various occasions.
[0003] The outer rotor and the inner rotor of the currently known dual-rotor permanent magnet motor are rotated by the interaction force between the electromagnet and the coil, and the outer rotor shaft and the inner rotor shaft are rotatably connected to the motor housing through bearings. When in use, the coil needs to be energized through a wire, and the rotation direction, rotation speed and other parameters of the inner rotor and the outer rotor are controlled by controlling the frequency of the current input to the coil. Since the coil is generally located between the inner rotor and the outer rotor, when the wire is arranged to energize the coil, the wire is prone to fly between the inner rotor and the outer rotor, affecting the safety of the dual-rotor permanent magnet motor. The inner rotor shaft and the outer rotor shaft must rotate with the inner rotor and the outer rotor respectively, so it is impossible to use the inner rotor shaft and the outer rotor shaft to install and hide the wire. Utility Model Content
[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a dual axial flow fan and a vehicle.
[0005] The first aspect of the present application provides a dual axial flow fan, including a mounting shaft, an outer rotor, an inner rotor, a conductor ring and a brush, wherein the mounting shaft is fixedly arranged in the air duct along the axial direction of the air duct; the outer rotor and the inner rotor are respectively rotatably mounted on the mounting shaft, one of the inner rotor and the outer rotor is provided with a permanent magnet, and the corresponding position of the other is provided with a winding; the conductor ring is sleeved on the mounting shaft and arranged corresponding to the winding, the mounting shaft is provided with a first threading channel along the axial direction, one end of the external wiring harness is connected to the winding after passing through the first threading channel, and the conductive ring and the winding are electrically connected through a brush. Optionally, one end of the outer rotor is sleeved on the inner rotor, and the other end of the outer rotor is provided with an outer rotor shaft, the outer rotor shaft is rotatably sleeved on the mounting shaft, and a first fan is provided on the outer rotor shaft; one end of the inner rotor away from the outer rotor extends out of the outer rotor to form an inner rotor shaft, the inner rotor shaft (202) is rotatably sleeved on the mounting shaft, and a second fan is provided on the inner rotor shaft.
[0006] Optionally, at least two fixed plates are provided in the air duct, and both ends of the mounting shaft are fixedly connected to the fixed plates respectively, one of the fixed plates opens a second wire threading channel along the radial direction of the air duct, the second wire threading channel is connected to the first wire threading channel, one end of the external wire harness passes through the second wire threading channel and the first wire threading channel in sequence and then is connected to the winding, and the other end of the external wire harness passes through the second wire threading channel out of the air duct.
[0007] Optionally, the winding is a three-phase winding, the number of the conductor rings and the number of the brushes are both three, the three conductor rings are arranged at intervals along the axial direction of the installation shaft, and the three-phase winding is electrically connected to the three conductor rings through three brushes respectively.
[0008] Optionally, the three brushes are evenly distributed at an angle of 120° around the circumference of the mounting axis, and the three brushes are arranged in a one-to-one correspondence with the three conductor rings.
[0009] Optionally, the brush is pressed onto the conductor ring through an elastic member, and the brush and the elastic member rotate together with the inner rotor or the outer rotor.
[0010] Optionally, the permanent magnet is arranged on the inner wall of the outer rotor, and the winding is arranged on the inner rotor and corresponds to the permanent magnet.
[0011] Optionally, the inner rotor is axially provided with a first mounting channel, the mounting shaft passes through the first mounting channel, the brush and the conductor ring are arranged in the first mounting channel, one end of the elastic member is connected to the brush, and the other end is connected to the side wall of the first mounting channel.
[0012] Optionally, the permanent magnets are arranged on the inner rotor, and the windings are arranged on the outer rotor and correspond to the permanent magnets.
[0013] Optionally, the outer rotor shaft is axially provided with a second mounting channel, the second mounting channel is sleeved on the mounting shaft and rotatably connected to the mounting shaft, the brush and the conductor ring are arranged in the second mounting channel, one end of the elastic member is connected to the brush, and the other end is connected to the side wall of the second mounting channel.
[0014] The present application also provides a vehicle, characterized in that it comprises a dual axial flow fan as described in any one of the above items.
[0015] Compared with the prior art, the dual axial flow fan provided in the embodiment of the present application has the following beneficial effects:
[0016] The double axial flow fan provided in the embodiment of the present application has a permanent magnet on one of the inner rotor and the outer rotor, and a winding is correspondingly provided on the other. The conductor ring is sleeved on the mounting shaft and is arranged corresponding to the winding. The conductor ring is electrically connected to the external wiring harness. The brush is electrically connected between the winding and the conductor ring. The external wiring harness is connected to a battery or a power supply, and the current is sent to the winding through the conductor ring and the brush, generating a rotating magnetic field in the winding, which interacts with the magnetic field generated by the permanent magnet, thereby realizing the reverse rotation of the inner rotor and the outer rotor. A first threading channel is axially provided on the mounting shaft, and one end of the external wiring harness passes through the first threading channel and is connected to the winding. The conductive ring and the winding are electrically connected through the brush, thereby avoiding the danger caused by the external wiring harness being exposed between the outer rotor and the inner rotor, and improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0019] Figure 1 It is a structural schematic diagram of a double axial flow fan according to some embodiments of the present disclosure;
[0020] Figure 2 This is a schematic structural diagram of a dual axial flow fan according to some other embodiments of the present disclosure.
[0021] Among them, 101, air duct; 102, fixing plate; 103, mounting shaft; 104, first threading channel; 105, second threading channel; 106, external wiring harness; 201, inner rotor; 202, inner rotor shaft; 203, winding; 204, first mounting channel; 205, conductor ring; 206, brush; 207, elastic member; 208, first accommodating chamber; 301, outer rotor; 302, outer rotor shaft; 303, permanent magnet; 304, second accommodating groove; 4, bearing; 5, second fan; 6, first fan. DETAILED DESCRIPTION
[0022] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.
[0024] like Figure 1 As shown, the embodiment of the present application provides a double axial flow fan, specifically, the double axial flow fan includes a fixed plate 102, a mounting shaft 103, an outer rotor 301 and an inner rotor 201, the number of the fixed plates 102 is two, and the fixed plates 102 can be single-layer plates or multi-layer plates, the two fixed plates 102 are arranged in the air duct 101 along the axial direction of the air duct 101, the mounting shaft 103 is arranged in the air duct 101 along the axial direction of the air duct 101, and the two ends of the mounting shaft 103 are respectively connected to the two fixed plates 102, the fixed plates 102 provide support for the fixed installation of the mounting shaft 103, the inner rotor 201 and the outer rotor 301 are arranged between the two fixed plates 102, and the outer rotor 301 is a hollow cylindrical structure as a whole, and one end of the outer rotor 301 is open, and the other end is closed. The outer rotor shaft 302 is closed and protrudes axially outward in the middle, and a second installation channel is opened in the axial direction of the outer rotor shaft 302. The outer rotor 301 and the outer rotor shaft 302 are sleeved on the installation shaft 103 through the second installation channel and are rotatably connected to the installation shaft 103. A first fan 6 is provided on the outer rotor shaft 302. The inner rotor 201 is located in the outer rotor 301. The inner rotor 201 is rotatably sleeved on the installation shaft 103, and one end of the inner rotor 201 extends from the open end of the outer rotor 301 to form the inner rotor shaft 202. A second fan 5 is provided on the inner rotor shaft 202. A permanent magnet 303 is provided on one of the inner rotor 201 and the outer rotor 301, and a winding 203 is correspondingly provided on the other, and the winding 203 is electrically connected to the external wiring harness 106. The external wiring harness 106 is connected to a battery or a power source, and sends current to the winding 203, generating a rotating magnetic field in the winding 203, which interacts with the magnetic field generated by the permanent magnet 303, thereby realizing the reverse rotation of the inner rotor 201 and the outer rotor 301. The dual-axial flow fan provided in this embodiment can realize the counter-rotation of the first fan 6 and the second fan 5 by using a dual-rotor motor. A dual-rotor motor only needs one controller to realize control, which can significantly reduce the number of switch tubes in the controller, thereby directly reducing the hardware cost, and also reducing the cost of other hardware related to the controller, such as power supply and interface circuit.
[0025] It should be noted that the air duct 101 can be a part of the air duct 101 of the house fresh air system, air conditioning system or new energy vehicle air conditioning, and the dual axial flow fan can be installed in the air duct 101 to increase the wind pressure and improve the air supply volume.
[0026] Further, in some embodiments of the present application, the winding 203 is a three-phase winding, and its winding method is the same as the winding method of the stator of a conventional permanent magnet synchronous motor. The three-phase windings are star-connected or delta-connected, and the three-phase windings are evenly arranged at 120 electrical degrees. An external cable is connected to the three-phase winding to provide controllable three-phase alternating current to the three-phase winding, and the three-phase windings are evenly arranged, so that the overall structure of the winding 203 is more stable.
[0027] Three conductor rings 205 are provided on the mounting shaft 103. The three conductor rings 205 are sleeved on the mounting shaft 103 at intervals along the axial direction of the mounting shaft 103 and are fixedly connected to the mounting shaft 103. That is to say, when the dual axial flow fan is running, the conductor rings 205 and the mounting shaft 103 are fixed, the inner rotor 201 and the outer rotor 301 make circular motions with the mounting shaft 103 as the rotation axis, and the three-phase winding is electrically connected to the three conductor rings 205 respectively through three brushes 206, and the conductor rings 205 are connected to the external wiring harness. Specifically, each phase winding 203 corresponds to a brush 206 and a conductor ring 205, one end of the brush 206 is electrically connected to the winding 203, and the other end is electrically connected to the conductor ring 205, and the external wiring harness 106 transmits current to the winding 203 through the conductor ring 205 and the brush 206. When the dual axial flow fan is running, the brush 206 rotates with the inner rotor 201 or the outer rotor 301, and maintains contact with the conductor ring 205 during rotation to achieve electrical connection with the conductor ring 205. The conductor ring 205 is made into a ring structure to ensure that the brush 206 can achieve contact with the conductor ring 205 no matter where it rotates, thereby improving the stability of the electrical connection.
[0028] Furthermore, in some embodiments of the present application, three brushes 206 are respectively arranged in one-to-one correspondence with the three conductor rings 205, and the three brushes 206 are evenly distributed at an angle of 120° around the circumference of the installation axis 103, making the dual axial flow fan more symmetrical in the overall structure and improving the stability of the overall structure.
[0029] Furthermore, in some embodiments of the present application, a first wire threading channel 104 is axially provided on the mounting shaft 103, one end of the first wire threading channel 104 extends to a position corresponding to the winding, and the other end extends to a connection point between the mounting shaft 103 and the fixed plate 102, a second wire threading channel 105 is radially opened on the fixed plate 102 along the air duct 101, the second wire threading channel 105 is communicated with the first wire threading channel 104, one end of the external wire harness 106 extends to the conductor ring 205 through the first wire threading channel 104 and the second wire threading channel 105 and is connected to the conductor ring 205, the external wire harness 106 includes three cables, which are electrically connected to the three conductor rings 205 respectively, the other end of the external wire harness 106 passes through the second wire threading channel 105 out of the air duct 101 and is connected to an external power supply or battery to provide three-phase alternating current for the winding 203. A first wire threading channel 104 and a second wire threading channel 105 are opened on the mounting shaft 103 and the fixing plate 102 to facilitate the introduction of the external wire harness 106 into the winding 203, thereby avoiding the flying wires of the external wire harness and improving the safety performance of the dual-axial flow fan, thereby achieving a compact overall structure and having a potential effect on improving the motor performance.
[0030] Specifically, in some embodiments of the present application, the shape of the outer rotor 301 is similar to a flat water cup, the inner rotor 201 extends from the open end of the outer rotor 301 into the outer rotor 301, the outer rotor 301 is rotatably connected to the mounting shaft 103 at the closed end and the outer rotor shaft 302, the inner rotor shaft 202 is located outside the outer rotor 301, and the inner rotor 201 is provided with a second fan 5, and the inner rotor shaft 202 is extended from the inside of the outer rotor 301, mainly to install the second fan 5, to avoid interference between the outer rotor 301 and the second fan 5, and to affect the normal operation of the second fan 5. The shape of the fixing plate 102 is a long strip, a cross or a cross shape, and it is required that the edge of the fixing plate 102 can be fixedly connected to the inner wall of the air duct 101, and the setting of the fixing plate 102 will not affect the flow of wind in the air duct 101.
[0031] Furthermore, in some embodiments of the present application, the brush 206 is pressed on the conductor ring 205 through the elastic member 207, and the brush 206 and the elastic member 207 move together with the inner rotor 201 or the outer rotor 301. The brush 206 is pressed on the conductor ring 205 through the elastic member 207, which ensures that the brush 206 is always in contact with the conductor ring 205. Even if the position of the brush 206 changes with the rotation of the inner rotor 201 or the outer rotor 301 during the operation of the dual axial flow fan, the brush 206 can always be pressed on the conductor ring 205 due to the action of the elastic member 207.
[0032] Furthermore, in some embodiments of the present application, the permanent magnet 303 is disposed on the inner wall of the outer rotor 301 , and the winding 203 is disposed on the inner rotor 201 and is disposed corresponding to the permanent magnet 303 .
[0033] Specifically, the permanent magnets 303 are arranged in an annular shape on the inner wall of the outer rotor 301, the inner rotor 201 is in a cylindrical shape with closed ends, and the mounting shaft 103 passes through the inner rotor 201 along the axial direction of the inner rotor 201, the inner rotor 201 is rotatably connected to the mounting shaft 103, the inner rotor 201 includes an inner shell and an outer shell in the radial direction, the inner shell and the outer shell together form a closed first accommodating chamber 208, the winding 203 is wound in the first accommodating chamber 208 with the mounting shaft 103 as the center line, the position of the permanent magnet 303 is set corresponding to the position of the winding 203, the permanent magnet 303 is set in an annular shape, the winding 203 is wound in the first accommodating chamber 208 of the inner rotor 201 with the mounting shaft 103 as the center, and the inner rotor 201 and the outer rotor 301 can form a mutual magnetic field force no matter what angle they are rotated to.
[0034] Furthermore, in some embodiments of the present application, a first mounting channel 204 is axially arranged on the inner rotor 201, the mounting shaft 103 passes through the first mounting channel 204, the brush 206 and the conductor ring 205 are both arranged in the first mounting channel 204, one end of the elastic member 207 is connected to the brush 206, and the other end is connected to the side wall of the first mounting channel 204. Specifically, the inner shell of the inner rotor 201 is a cylindrical structure, and the inner side of the inner shell forms a first installation channel 204. The conductor ring 205 is located at a position corresponding to the installation shaft 103 and the inner rotor 201, specifically located in the first installation channel 204 and arranged corresponding to the terminal head of the three-phase winding. The terminal head of the three-phase winding passes through the inner shell and extends into the first installation channel 204 to be electrically connected to the brush 206. The brush 206 is correspondingly pressed on the conductor ring 205 by the elastic member 207. One end of the elastic member 207 is connected to the inner wall of the inner shell, and the other end is connected to the brush 206. The elastic member 207 can be a spring. The elastic member 207 is always in a compressed state after assembly is completed. Therefore, the elastic member 207 will provide a reaction force on the brush 206, press the brush 206 on the conductor ring 205, and keep it in contact with the conductor ring 205 at all times.
[0035] like Figure 2 As shown, in some other embodiments of the present application, the permanent magnet 303 may also be disposed on the inner rotor 201 , and the winding 203 may be disposed on the outer rotor 301 and disposed opposite to the permanent magnet 303 .
[0036] Specifically, the permanent magnet 303 is annular and is sleeved on the inner wall of the inner rotor 201. The winding 203 is arranged in the outer rotor 301. The outer rotor shaft 302 is axially provided with a second mounting channel, the second mounting channel is sleeved on the mounting shaft 103 and is rotatably connected to the mounting shaft 103. The brush 206 and the conductor ring 205 are arranged in the second mounting channel. One end of the elastic member 207 is connected to the brush 206, and the other end is connected to the side wall of the second mounting channel.
[0037] The outer rotor 301 is arranged to have a two-layer structure, and a second accommodating chamber 304 for the winding 203 is formed between the two layers, which is similar to the structure of the inner rotor 201 in the previous embodiment. In this embodiment, the structure of the outer rotor 301 is similar to the structure of the inner rotor 201 in the previous embodiment, that is, the positions and corresponding relationship of the inner rotor 201 and the outer rotor 301 are interchanged, and correspondingly, the positions of the brush 206 and the conductor ring 205 also need to change. Since the winding 203 is arranged in the outer rotor 301, for the convenience of connection, the brush 206 and the conductor ring 205 are also arranged in a second installation channel closer to the winding 203. The conductor ring 205 is fixed on the installation shaft 103 corresponding to the second installation channel. The brush 206 corresponds to the conductor ring 205 one by one. One end of the elastic member 207 is connected to the side wall of the second installation channel, and the other end is connected to the brush 206, so that the brush 206 is pressed on the conductor ring 205.
[0038] It should be noted that the inner rotor 201 and the outer rotor 301 are rotatably connected to the mounting shaft 103 by means of the bearing 4, the first fan 6 is fixedly connected to or integrally formed with the outer rotor shaft 302, and the second fan 5 is fixedly connected to or integrally formed with the inner rotor shaft 202. In some embodiments of the present application, the first fan 6 is arranged at the air inlet end as a front fan, and the second fan 5 is arranged at the air outlet end as a rear fan. Of course, the positions of the first fan 6 and the second fan 5 can also be interchanged. The first fan 6 is arranged at the air outlet end, and the second fan 5 is arranged at the air inlet end. In this case, the positions of the outer rotor 301 and the inner rotor 201 should also be interchanged accordingly. In other words, the relative positions of the outer rotor 301 and the inner rotor 201 are not fixed. The inner rotor 201 can be located at the rear side of the outer rotor 301, or at the front side of the outer rotor 301. The "front side" and "rear side" mentioned here are defined by the wind flow direction, and the wind flows from front to back in the air duct 101. Refer to Figure 1 and Figure 2 As shown, Figure 1 The arrow in refracts the direction of the wind flow in the air duct 101 .
[0039] During specific assembly, since the inner rotor 201 and the outer rotor 301 are required to have the same moment of inertia, and the mass of the permanent magnet 303 is lighter than that of the winding 203 , in a preferred embodiment, the permanent magnet 303 is disposed on the outer rotor 301 and the winding 203 is disposed on the inner rotor 201 .
[0040] The dual axial flow fan of the present application can be controlled by a motor controller. The speed signal of the controller input represents the speed difference between the inner rotor 201 and the outer rotor 301. The speed difference is the control quantity of the controller. The speed of the inner rotor 201 and the outer rotor 301 relative to the air duct 101 is determined by the speed difference and the load torque and rotational inertia distribution of the two. Through the mechanical design of the blade structure and rotational inertia counterweight of the first fan 6 and the second fan 5, the precise distribution of the speed of the first fan 6 and the second fan 5 can be achieved.
[0041] Furthermore, in some embodiments of the present application, a vehicle is provided, comprising the dual axial flow fan in any of the above embodiments, and the dual axial flow fan is applied to an air conditioning system of the vehicle.
[0042] In summary, the dual axial flow fan provided in the present application realizes the counter-rotation of the first fan 6 and the second fan 5 through the interaction between the permanent magnets 303 and the windings 203 on the inner rotor 201 and the outer rotor 301. The dual axial flow fan can be controlled by a controller, thereby greatly reducing the cost of realizing the counter-rotation structure.
[0043] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
Claims
1. A double axial flow fan, characterized in that: It includes a mounting shaft, an outer rotor, an inner rotor, a conductor ring and a brush. The mounting shaft is fixedly arranged in the air duct along the axial direction of the air duct; the outer rotor and the inner rotor are rotatably mounted on the mounting shaft respectively, one of the inner rotor and the outer rotor is provided with a permanent magnet, and the corresponding position of the other is provided with a winding; the conductor ring is sleeved on the mounting shaft and arranged corresponding to the winding, the mounting shaft is provided with a first threading channel along the axial direction, one end of the external wire harness passes through the first threading channel and is connected to the winding, and the conductor ring and the winding are electrically connected through a brush.
2. The dual axial flow fan according to claim 1, characterized in that: One end of the outer rotor is sleeved on the inner rotor, and the other end of the outer rotor is provided with an outer rotor shaft, the outer rotor shaft is rotatably sleeved on the mounting shaft, and a first fan is provided on the outer rotor shaft; one end of the inner rotor away from the outer rotor extends out of the outer rotor to form an inner rotor shaft, the inner rotor shaft is rotatably sleeved on the mounting shaft, and a second fan is provided on the inner rotor shaft.
3. The dual axial flow fan according to claim 1, characterized in that: At least two fixing plates are provided in the air duct, and both ends of the mounting shaft are fixedly connected to the fixing plates respectively, one of the fixing plates has a second threading channel opened along the radial direction of the air duct, the second threading channel is connected to the first threading channel, one end of the external wiring harness passes through the second threading channel and the first threading channel in sequence and is connected to the winding, and the other end of the external wiring harness passes through the second threading channel out of the air duct.
4. The dual axial flow fan according to claim 1, characterized in that: The winding is a three-phase winding, the number of the conductor rings and the number of the brushes are both three, the three conductor rings are arranged at intervals along the axial direction of the installation shaft, and the three-phase winding is electrically connected to the three conductor rings through three brushes respectively.
5. The dual axial flow fan according to claim 2, characterized in that: The three brushes are evenly distributed at an angle of 120° around the circumference of the installation axis, and the three brushes are arranged in a one-to-one correspondence with the three conductor rings.
6. The dual axial flow fan according to claim 2, characterized in that: The brush is pressed onto the conductor ring through an elastic member, and the brush and the elastic member rotate together with the inner rotor or the outer rotor.
7. The dual axial flow fan according to claim 6, characterized in that: The permanent magnet is arranged on the inner wall of the outer rotor, and the winding is arranged on the inner rotor and corresponds to the permanent magnet.
8. The dual axial flow fan according to claim 7, characterized in that: The inner rotor is axially provided with a first mounting channel, the mounting shaft passes through the first mounting channel, the brush and the conductor ring are arranged in the first mounting channel, one end of the elastic member is connected to the brush, and the other end is connected to the side wall of the first mounting channel.
9. The dual axial flow fan according to claim 6, characterized in that: The permanent magnets are arranged on the inner rotor, and the windings are arranged on the outer rotor and corresponding to the permanent magnets.
10. The dual axial flow fan according to claim 9, characterized in that: The outer rotor shaft is axially provided with a second mounting channel, the second mounting channel is sleeved on the mounting shaft and rotatably connected to the mounting shaft, the brush and the conductor ring are arranged in the second mounting channel, one end of the elastic member is connected to the brush, and the other end is connected to the side wall of the second mounting channel.
11. A vehicle, characterized in that: It comprises a dual axial flow fan as described in any one of claims 1 to 10.