Electric axial flow counter-rotating fan

Abstract

The invention provides an electric axial flow contra-rotating fan. The electric axial flow contra-rotating fan comprises a first fan impeller and a second fan impeller, the double-rotor motor comprises a first rotating shaft, a second rotating shaft, a first motor rotor assembly, a motor stator assembly and a second motor rotor assembly which are coaxially arranged; wherein the first rotating shaft is a hollow shaft and sleeves the radial outer side of the second rotating shaft, the first motor rotor assembly is connected to the first rotating shaft in an anti-torque mode, the second motor rotor assembly is connected to the second rotating shaft in an anti-torque mode, and the motor stator assembly is fixedly arranged on a shell of the double-rotor motor and located between the first motor rotor assembly and the second motor rotor assembly; the first motor rotor assembly and the motor stator assembly form a first motor to drive the first fan impeller to rotate, and the second motor rotor assembly and the motor stator assembly form a second motor to drive the second fan impeller to rotate. The impeller assembly of the counter-rotating fan is independently driven by the double-rotor motor, so that the miniaturization design of the counter-rotating fan is realized.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to an electric axial-flow counter-rotating fan. Background Art

[0002] As a new type of aerodynamic device, counter-rotating fans are widely used in a variety of fields, including cooling fans and aircraft propulsion fans, due to their high flow rate and high efficiency. Compared with traditional single-fans, counter-rotating fans offer better airflow characteristics and higher thrust efficiency, and therefore are receiving increasing attention in modern engineering.

[0003] However, existing electric counter-rotating fan systems usually use two independent motors to drive the rotation of two impellers respectively. For example, CN111043057B discloses a counter-rotating fan, which includes a first-stage impeller and a second-stage impeller, and the two impellers are driven by independent motors. This design allows the two impellers to have different speeds and directions. However, the configuration of the dual motors makes the fan system complicated, especially increasing the volume and weight of the motor structure, especially in high-power application scenarios (such as aviation propulsion or industrial-grade heat dissipation). In addition, the dual-motor system also leads to an increase in the overall axial size of the fan, which not only affects the flexibility of installation, but may also affect the performance and stability of the fan.

[0004] The patent also discloses an embodiment in which a single motor drives the impeller, with a transmission mechanism, such as a planetary gear mechanism, connected between the motor and the impeller. However, due to mechanical transmission losses, uneven torque distribution, or axial space occupation, this design struggles to achieve both efficiency and compactness. Therefore, simplifying the drive system of an electric counter-rotating fan, reducing its size and weight while maintaining or improving its performance, has become a technical challenge that needs to be addressed. Summary of the Invention

[0005] In order to overcome or alleviate the above-mentioned deficiencies in the prior art, one object of the present application is to provide an electric axial-flow counter-rotating fan, which realizes a miniaturized design of the counter-rotating fan by using a dual-rotor motor to independently drive the impeller assembly of the counter-rotating fan.

[0006] In order to achieve the above-mentioned purpose of the invention, the present application may adopt the following technical solutions.

[0007] The present application provides an electric axial-flow counter-rotating fan, comprising:

[0008] An impeller assembly includes a first fan impeller and a second fan impeller, wherein blades of the first fan impeller and the second fan impeller have opposite rotation directions;

[0009] A dual-rotor motor, comprising a coaxially arranged first rotating shaft, a second rotating shaft, a first motor rotor assembly, a motor stator assembly, and a second motor rotor assembly; wherein the first rotating shaft is a hollow shaft and is sleeved radially outside the second rotating shaft, the first motor rotor assembly is torsionally connected to the first rotating shaft, the second motor rotor assembly is torsionally connected to the second rotating shaft, the motor stator assembly is fixedly disposed on the housing of the dual-rotor motor and is located between the first motor rotor assembly and the second motor rotor assembly, the first fan impeller is torsionally connected to the first rotating shaft, and the second fan impeller is torsionally connected to the second rotating shaft;

[0010] a fan guide support plate, which is installed on the radial outer side of the dual-rotor motor and is used to form a gas channel;

[0011] The first motor rotor assembly and the motor stator assembly form a first motor to drive the first fan impeller to rotate, and the second motor rotor assembly and the motor stator assembly form a second motor to drive the second fan impeller to rotate.

[0012] In at least one embodiment, the motor stator assembly includes a stator core and a stator winding coil embedded in the stator core, the stator core includes a plurality of stator teeth evenly arranged along the circumferential direction, stator slots are formed between adjacent stator teeth, and the stator winding coil is wound around the stator teeth.

[0013] In at least one embodiment, the stator core includes a first stator tooth portion and a second stator tooth portion extending axially, and the ratio of the axial length of the first stator tooth portion to the second stator tooth portion is equal to the ratio of the rated powers of the first fan impeller to the second fan impeller.

[0014] In at least one embodiment, the first motor rotor assembly and the second motor rotor assembly have the same structure, wherein the first motor rotor assembly includes a rotor back iron, a rotor magnet and a rotor sleeve, the rotor magnet is fixed to the mounting surface of the rotor back iron and is arranged at intervals along the circumference of the rotor back iron, the rotor sleeve is covered on the radial outer side of the rotor back iron, and the mounting surface of the rotor back iron of the first motor rotor assembly is opposite to the mounting surface of the rotor back iron of the second motor rotor assembly.

[0015] In at least one embodiment, the dual-rotor motor includes a first bearing, a second bearing, a third bearing and a fourth bearing arranged in sequence along the axial direction; wherein the first rotating shaft is supported on or passes through the second bearing, the third bearing and the fourth bearing in sequence, and the second rotating shaft is supported on or passes through the first bearing, the second bearing and the fourth bearing in sequence.

[0016] In at least one embodiment, the counter-rotating fan includes a first locking nut and a second locking nut, the first locking nut locks the first fan impeller to the second rotating shaft; the second locking nut locks the second fan impeller to the first rotating shaft, and the first fan impeller and the second fan impeller are adjacently arranged on one axial side of the dual-rotor motor.

[0017] In at least one embodiment, the counter-rotating fan includes a cooling water jacket, and the dual-rotor motor includes a front cover and a rear cover arranged coaxially, the front cover being arranged on the other axial side of the second rotating shaft, the front cover being rotatably connected to the second rotating shaft, and the front cover being connected to the cooling water jacket;

[0018] The rear end cover is rotatably connected to the first rotating shaft, and the rear end cover is respectively connected to the fan guide support plate and the cooling water jacket.

[0019] In at least one embodiment, the dual-rotor motor includes a coaxially arranged tail end cover, the tail end cover is arranged on one axial side of the second rotating shaft, a fifth bearing is provided between the tail end cover and the second rotating shaft, the tail end cover is rotatably connected to the second rotating shaft through the fifth bearing, and the outer ring of the tail end cover is covered on the radial outer side of the impeller assembly and is fixedly connected to the fan guide support plate.

[0020] In at least one embodiment, the motor stator assembly includes a first motor stator winding coil and a second motor stator winding coil;

[0021] The counter-rotating fan also includes a motor controller, which is electrically connected to the first motor stator winding coil and the second motor stator winding coil; the motor controller can independently control and adjust the rotational speed and acceleration of the first motor rotor assembly and the second motor rotor assembly.

[0022] In at least one embodiment, the counter-rotating fan includes a cooling water jacket and two stator cores, and the two stator cores are axially fixed side by side to the radial inner side of the cooling water jacket; the fan guide support plate is provided with a plurality of high-voltage wire holes and a plurality of water outlets, the plurality of high-voltage wire holes are used to supply power to the dual-rotor motor, and the plurality of water outlets include a water inlet and a water outlet, and the plurality of water outlets are connected to the cooling water channel of the cooling water jacket.

[0023] By adopting the above-mentioned technical solution, the present application provides an electric axial-flow counter-rotating fan. The dual-rotor motor can independently drive the impeller assembly of the counter-rotating fan, solving the weight problem caused by the traditional two drive motors driving the impeller assembly separately. Furthermore, the dual-rotor motor is a dual-rotor single-stator motor that uses a centralized stator assembly to achieve independent control of the two motor rotor assemblies and impeller assemblies. This motor design significantly shortens the motor's axial dimensions and reduces its volume, enabling a miniaturized counter-rotating fan design. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the three-dimensional structure of an electric axial-flow counter-rotating fan according to an embodiment of the present application;

[0025] Figure 2 for Figure 1 A schematic cross-sectional view of an electric axial-flow counter-rotating fan taken along the central axis of its dual-rotor motor;

[0026] Figure 3 This is a schematic structural diagram of a dual-rotor motor according to an embodiment of the present application;

[0027] Figure 4 This is a schematic structural diagram of a dual-rotor motor according to an embodiment of the present application;

[0028] Figure 5 for Figure 4 A schematic cross-sectional view of a dual-rotor motor taken along the central axis of its stator core;

[0029] Figure 6 for Figure 4 Schematic diagram of the structure of the stator core;

[0030] Figure 7 for Figure 4 A schematic structural diagram of the first motor rotor assembly, the second motor rotor assembly and the motor stator assembly;

[0031] Figure 8 for Figure 4 A schematic structural diagram of the first motor rotor assembly and the second motor rotor assembly;

[0032] Figure 9 This is a schematic structural diagram of an electric axial-flow counter-rotating fan structure according to an embodiment of the present application, wherein the tail end cover is not included;

[0033] Figure 10 for Figure 4 Schematic diagram of the structure of the first motor stator winding coil, the stator core and the second motor stator winding coil.

[0034] Description of Reference Numerals

[0035] 10 impeller assembly;

[0036] 11 first fan impeller; 12 second fan impeller;

[0037] 20 dual-rotor motors;

[0038] 21 first axis;

[0039] 22 second rotating shaft;

[0040] 23 first motor rotor assembly;

[0041] 230 rotor back iron; 231 rotor magnetic steel; 232 rotor sleeve;

[0042] 24 motor stator assembly;

[0043] 240 stator core; 241 first motor stator winding coil; 242 second motor stator winding coil; 243 stator teeth; 244 stator slots; 245 first stator tooth portion; 246 second stator tooth portion;

[0044] 25 second motor rotor assembly;

[0045] 26 front end cover;

[0046] 27 rear end cover;

[0047] 28 tail end cap;

[0048] 29 cooling water jacket;

[0049] 30 Fan guide plate;

[0050] 41 first bearing; 42 second bearing; 43 third bearing; 44 fourth bearing; 45 fifth bearing;

[0051] 51 first locking nut; 52 second locking nut;

[0052] R radial;

[0053] A axial direction;

[0054] C circumferential DETAILED DESCRIPTION

[0055] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all possible methods of the present application, nor to limit the scope of the present application.

[0056] Embodiments of the present application provide an electric axial-flow counter-rotating fan (hereinafter sometimes referred to as a "fan"). Unless otherwise specified, "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions, respectively, of a dual-rotor motor (hereinafter sometimes referred to as a "motor") of the electric axial-flow counter-rotating fan of the present application.

[0057] Furthermore, "radially outer side" refers to the side away from the central axis of the motor in the radial direction, and "radially inner side" refers to the side close to the central axis of the motor in the radial direction. Figure 2 The right side of the axis refers to Figure 2 on the left side of the .

[0058] In this application, "torsionally-resistant connection" of two components means that the two components are connected in a manner capable of transmitting torque, including direct connection or indirect connection. For example, the two components can be directly torsionally-resistant connected via splines.

[0059] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] like Figure 1 、 Figure 2 and Figure 9 As shown, an embodiment of the present application provides an electric axial counter-rotating fan, which may include an impeller assembly 10 , a dual-rotor motor 20 and a fan guide support plate 30 .

[0061] The impeller assembly 10 may include a first fan impeller 11 and a second fan impeller 12 , and the rotation directions of the blades of the two impellers may be opposite.

[0062] like Figure 2 As shown, the dual-rotor motor 20 may include a first rotating shaft 21 , a second rotating shaft 22 , a first motor rotor assembly 23 , a motor stator assembly 24 and a second motor rotor assembly 25 that are coaxially arranged.

[0063] Furthermore, in this embodiment, the dual-rotor motor 20 may be an axial flux motor.

[0064] like Figure 2 As shown, the first rotating shaft 21 can be a hollow shaft, and the first rotating shaft 21 can be sleeved on the radially outer side of the second rotating shaft 22. At the same time, the first motor rotor assembly 23 can be torsionally connected to the first rotating shaft 21, the second motor rotor assembly 25 can be torsionally connected to the second rotating shaft 22, and the motor stator assembly 24 can be fixedly disposed in the housing of the dual-rotor motor 20 and located between the first motor rotor assembly 23 and the second motor rotor assembly 25.

[0065] In this embodiment, the first motor rotor assembly 23 and the second motor rotor assembly 25 of the dual-rotor motor 20 can share a stator assembly 24. It will be appreciated that the first motor rotor assembly 23 and the motor stator assembly 24 can constitute a first motor, which drives the first fan impeller 11 to rotate via the first rotating shaft 21. The first fan impeller 11 can be torque-proof connected to the first rotating shaft 21 and secured with a first locking nut 51. The first fan impeller 11 and the second fan impeller 12 are disposed adjacent to each other and on one axial side of the dual-rotor motor 20.

[0066] Similarly, the second motor rotor assembly 25 and the motor stator assembly 24 can constitute a second motor, which drives the second fan impeller 12 to rotate via the second rotating shaft 22. The second fan impeller 12 can be connected to the second rotating shaft 22 in a torsion-proof manner and fastened by a second locking nut 52.

[0067] As can be seen from the above, the motor stator assembly 24 can perform the functions of two stators. This design can effectively reduce iron loss and allow the rotor assembly to be controlled separately, greatly shortening the axial dimension of the motor and reducing the overall volume.

[0068] Preferably, the first rotating shaft 21 and the second rotating shaft 22 may be made of the same material, such as 45 steel.

[0069] Further, see Figure 2 and Figure 3 Because the second rotating shaft 22 is longer along the axial direction A and nested within the first rotating shaft 21, its diameter is relatively small. Therefore, considering structural reliability and rotor dynamics, in this embodiment, the second fan impeller 12 can be designed to be lighter than the first fan impeller 11.

[0070] Preferably, in this embodiment, the design weight of the second fan impeller 12 may be 0.3 to 0.8 times the design weight of the first fan impeller 11 .

[0071] See also Figure 4 and Figure 5 The motor stator assembly 24 may include a stator core 240, stator winding coils embedded within the stator core 240, and a cooling water jacket 29. In this embodiment, the motor stator assembly 24 includes a cooling water jacket 29 and two stator cores. The two stator cores may be fixedly mounted side by side radially inward of the cooling water jacket. This effectively improves the heat dissipation performance of the motor stator assembly 24 and increases the power density of the motor.

[0072] like Figure 6As shown, the stator core 240 may include a plurality of stator teeth 243 evenly distributed along the circumferential direction C. Stator slots 244 may be formed between adjacent stator teeth 243 , and stator winding coils may be wound in the stator slots 244 along the axial direction A of the motor.

[0073] Furthermore, the stator core 240 can adopt a variety of structural forms. First, it can be designed as a laminated structure, that is, it can be composed of thin-plate core laminations stacked in the axial direction. The stator core of this structure can be made of materials with low magnetic resistance and low eddy current loss. Secondly, the stator core can also be made of soft magnetic composite materials, which can also reduce eddy current losses. Its size and shape can be determined according to the electromagnetic design of the motor. In addition, the stator core 240 can also include a thin-plate magnetic conductive material wound along the radial direction R, which needs to be wound at least once to ensure the integrity of the structure.

[0074] Further, if Figure 6 As shown, each stator tooth 243 of the stator core 240 includes an axially extending first stator tooth portion 245 and a second stator tooth portion 246. The relative position between the first stator tooth portion 245 and the second stator tooth portion 246 can be designed to be relative or staggered by a certain mechanical angle, and the specific design method is not limited.

[0075] like Figure 7 and Figure 10 As shown, the stator winding coil may be wound around the stator core 240 along the axial direction A. Specifically, the stator winding coil may include a first stator winding coil 241 and a second stator winding coil 242 , and the first stator winding coil 241 may be provided on the first stator tooth portion 245 , and the second stator winding coil 242 may be provided on the second stator tooth portion 246 .

[0076] Furthermore, the stator winding coil can be composed of multiple components divided into blocks along the circumferential direction C, and these components together constitute the entire stator winding coil. During the manufacturing process of the stator winding coil, traditional winding methods can be used, or flat copper wire and flat copper plate can be used for insert molding.

[0077] Furthermore, based on the aerodynamic design results of the counter-rotating fan, it is known that the power of the first and second fan impellers is different, resulting in a difference in the axial lengths of the first stator teeth 245 and the second stator teeth 246. However, because the inner and outer diameters of the first and second stator teeth 245, 246 are the same, the ratio of the axial lengths of the first and second stator teeth 245, 246 can be equal to the ratio of the rated power of the first and second fan impellers 11, 12.

[0078] like Figure 2 As shown, the dual-rotor motor 20 may include a first motor rotor assembly 23 and a second motor rotor assembly 25. Figure 8 The first motor rotor assembly 23 and the second motor rotor assembly 25 can be axial flux rotor assemblies with the same structure, but the mounting surfaces of the rotor back iron 230 of the two are opposite (that is, both are facing the axial middle position of the dual-rotor motor 20, or in other words, both are facing the stator core 240).

[0079] Specifically, if Figure 8 As shown, the first motor rotor assembly 23 and the second motor rotor assembly 25 may each include a rotor back iron 230 , a rotor magnet 231 and a rotor sleeve 232 .

[0080] The rotor magnets 231 can be fixed to the mounting surface of the rotor back iron 230 and evenly spaced along the circumferential direction C. Furthermore, the rotor magnets 231 can employ a design such as a Halbach magnet array or a concentrated tangential magnet array to enhance the air gap magnetic field strength of the motor. The rotor magnets 231 can be directly attached to the mounting surface of the rotor back iron 230 by bonding. Furthermore, the rotor magnets 231 can also be composed of a combination of multiple magnets.

[0081] The rotor sheath 232 can be wrapped around the radially outer side of the rotor back iron 230 to protect the rotor back iron 230 and the rotor magnet 231 from the centrifugal force during high-speed rotation. The rotor sheath 230 can be machined from a metal material or wound from a carbon fiber composite material.

[0082] In addition, a plurality of threaded holes are reserved on the mounting surface of the rotor back iron 230 to facilitate mounting and fixing with the rotating shaft of the dual-rotor motor 20 .

[0083] The dual-rotor motor 20 may include a motor controller that may be electrically connected to the first motor stator winding coil 241 and the second motor stator winding coil 242. Furthermore, the motor controller can independently control and adjust the rotational speed and acceleration of the first motor rotor assembly 23 (and the first fan impeller 11) and the second motor rotor assembly 25 (and the second fan impeller 12), thereby achieving stable power output.

[0084] like Figure 2 As shown, the dual-rotor motor 20 may further include a front end cover 26 and a rear end cover 27 that are coaxially arranged to seal and fix the left and right sides of the motor.

[0085] like Figure 2 As shown, the dual-rotor motor 20 may include a first bearing 41, a second bearing 42, a third bearing 43, and a fourth bearing 44 arranged in sequence along the axial direction A. The first rotating shaft 21 may be supported on or pass through the second bearing 42, the third bearing 43, and the fourth bearing 44 in sequence, and the second rotating shaft 22 may be supported on or pass through the inner rings of the first bearing 41, the second bearing 42, and the fourth bearing 44 in sequence.

[0086] The first bearing 41 is used to connect and support the left side of the second rotating shaft 21 and the front end cover 26, so that the second rotating shaft 22 can rotate within the front end cover 26. The second bearing 42 is used to connect and support the left side of the first rotating shaft 21 and the second rotating shaft 22, so that the first rotating shaft 21 and the second rotating shaft 22 can rotate relative to each other. The third bearing 43 is used to connect and support the first rotating shaft 21 and the rear end cover 27, so that the axial force on the first rotating shaft 21 can be transmitted to the rear end cover 27. The fourth bearing 44 is used to connect and support the right side of the first rotating shaft 21 and the second rotating shaft 22, so that the first rotating shaft 21 and the second rotating shaft 22 can rotate independently.

[0087] Further, if Figure 2 As shown, the front end cover 26 can be disposed at the axial end of the second rotating shaft 22 near the second motor rotor assembly 25, i.e., the end on the other axial side. The front end cover 26 can be rotatably connected to the second rotating shaft 22 via a first bearing 41 to provide support for the second rotating shaft 22, and is connected to the cooling water jacket 29 to achieve sealing on the left side of the motor.

[0088] Further, if Figure 2 As shown, the rear end cover 27 is rotatably connected to the first rotating shaft 21 via a third bearing 43 and is connected to the fan guide plate 30 and the cooling water jacket 29 via fasteners (such as bolts), thereby sealing the right side of the motor. Simultaneously, the thrust transmitted from the third bearing 43 is transmitted to the fan guide plate 30 and the entire fan, thereby achieving forward thrust.

[0089] like Figure 1 and Figure 2 As shown, the dual-rotor motor 20 may include a coaxially arranged tail end cap 28. The tail end cap 28 may be disposed at an end of the second rotating shaft 22 proximal to the second fan impeller 12, i.e., on one axial side of the second rotating shaft 22. A fifth bearing 45 may also be disposed between the tail end cap 28 and the second rotating shaft 22. The bearing serves to connect and support the second rotating shaft 22 and the tail end cap 28, thereby providing a support point on the right side of the second rotating shaft 22 and maintaining independent rotation, thereby reducing axial wobble.

[0090] The tail end cover 28 includes an outer ring, which can be wrapped around the radial outer side of the impeller assembly 10 and fixedly connected to the fan guide support plate 30 by fasteners (such as bolts). Furthermore, the tail end cover 28 can be used to form a gas flow channel and build a circle of outer shell protection around the impeller assembly. This can not only prevent the impeller assembly from falling off and causing damage to external personnel and the environment, but also prevent damage caused by external objects. In addition, the middle position of the tail end cover 28 can also provide support for the second rotating shaft 22, thereby reducing the radial swing caused by the excessive length of the second rotating shaft 22 and increasing the stability of the fan.

[0091] Furthermore, if the design length of the second rotating shaft 22 is short and there is no need to protect the impeller assembly 20, the design of the tail end cover 28 can be eliminated. Figure 9 As shown, the fan in this embodiment is not equipped with the rear end cover 28. In this case, the thrust of the first rotating shaft 21 and the second rotating shaft 22 will be transmitted to the rear end cover 27 through the third bearing 43, and further transmitted to the fan, which places higher requirements on the load-bearing capacity of the third bearing 43.

[0092] In this embodiment, if Figure 2 As shown, the fan guide plate 30 can be installed on the radial outer side of the dual-rotor motor 20 to form a gas channel.

[0093] Furthermore, the fan guide support plate 30 can be a curved flow channel composed of symmetrical elliptical lines, or a straight flow channel or a flow channel of any shape. The final flow channel design depends on the application scenario and spatial layout of the fan, and is not limited here.

[0094] Specifically, the fan guide plate 30 may also be provided with multiple high-voltage cable holes and multiple water outlets. The multiple high-voltage cable holes can be used to provide three-phase power to the dual-rotor motor 20. Preferably, in this embodiment, six high-voltage cable holes are provided. The multiple water outlets may include a water inlet and a water outlet, respectively, for the inlet and outlet of motor cooling water.

[0095] It can be understood that the fan guide support plate 30 not only plays a role in mechanical structural support for the entire fan, thereby increasing the overall rigidity of the fan, but also can transfer the heat of the motor cooling water jacket 29 and dissipate the heat of the motor cooling water jacket 29 through gas flow.

[0096] See also Figure 2 For the fan provided in this application, the axial force transmission process between the fan and the motor can be divided into two parts. The first part is that the thrust generated by the first fan impeller 11 is transmitted to the first rotating shaft 21 through the first locking nut 51. The first rotating shaft 21 then transmits the thrust to the outer ring of the third bearing 43 through the boss located on the left side of the third bearing 43. Then, the third bearing 43 can transmit the force through the inner ring to the rear end cover 27, and the rear end cover 27 then transmits the thrust to the fan guide support plate 30 through bolts, completing the thrust transmission of the first fan impeller 11.

[0097] The second part is the thrust generated by the second fan impeller 12, which is transmitted to the second rotating shaft 22 through the second locking nut 52. The second rotating shaft 22 divides the thrust into two parts for transmission: the first part of the thrust is directly transmitted to the tail end cover 28 through the protrusion on the right side of the fifth bearing 45, and the tail end cover 28 then transmits the thrust to the fan guide support plate 30 through bolts; the second part of the thrust is transmitted to the first rotating shaft 21 through the protrusion of the second rotating shaft 22 on the left side of the second bearing 42, and the first rotating shaft 21 then transmits the thrust to the rear end cover 27 through the third bearing 43, and the rear end cover 27 transmits the thrust to the fan guide support plate 30 through bolts, completing the thrust transmission of the second fan impeller 12.

[0098] In this embodiment, the design of the fan system can comprehensively consider the axial arrangement of components and the selection of bearings to ensure the overall thrust of the fan and the thrust distribution of the impeller assembly 10. Furthermore, the design of the fan guide plate 30 and the tail end cover 28 can also focus on aerodynamic indicators such as overall flow rate and constraints such as motor heat dissipation, while also considering the overall length and weight of the fan system.

[0099] Furthermore, the fan system can meet different power and thrust requirements by adjusting the blade shape of the impeller assembly 10. The output ratio of different impeller assemblies can also be adjusted to achieve various control requirements. Furthermore, since the shape of the fan blades determines the direction of wind, changing the blade shape can also reconfigure the fan's air inlet and outlet layout, changing from the original arrangement of air intake through the tail cover 28 and air outlet through the fan guide plate 30 to air intake through the fan guide plate 30 and air outlet through the tail cover 28.

[0100] An embodiment of the present application provides an electric axial-flow counter-rotating fan. A dual-rotor motor can independently drive the fan's impeller assembly, resolving the weight issue associated with traditionally using two separate drive motors to drive the impeller assembly. Furthermore, the dual-rotor motor utilizes a centralized stator assembly, enabling independent control of the two motor rotor and impeller assemblies. The dual-rotor motor is an axial flux motor. This motor design significantly shortens the motor's axial dimensions and reduces its volume, enabling a compact counter-rotating fan design.

[0101] It should be understood that the above embodiments, examples, or examples are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments, examples, or examples based on the teachings of the present application without departing from the scope of the present application.

Claims

1. An electric axial-flow counter-rotating fan, characterized in that: include: An impeller assembly (10) comprises a first fan impeller (11) and a second fan impeller (12), wherein the blades of the first fan impeller (11) and the second fan impeller (12) rotate in opposite directions; A dual-rotor motor (20) comprises a first rotating shaft (21), a second rotating shaft (22), a first motor rotor assembly (23), a motor stator assembly (24) and a second motor rotor assembly (25) which are coaxially arranged; wherein the first rotating shaft (21) is a hollow shaft and is sleeved on the radially outer side of the second rotating shaft (22); the first motor rotor assembly (23) is torsionally connected to the first rotating shaft (21); the second motor rotor assembly (25) is torsionally connected to the second rotating shaft (22); the motor stator assembly (24) is fixedly arranged on the housing of the dual-rotor motor (20) and is located between the first motor rotor assembly (23) and the second motor rotor assembly (25); the first fan impeller (11) is torsionally connected to the first rotating shaft (21); and the second fan impeller (12) is torsionally connected to the second rotating shaft (22); a fan guide support plate (30), which is installed on the radially outer side of the dual-rotor motor (20) and is used to form a gas channel; The first motor rotor assembly (23) and the motor stator assembly (24) form a first motor to drive the first fan impeller (11) to rotate, and the second motor rotor assembly (25) and the motor stator assembly (24) form a second motor to drive the second fan impeller (12) to rotate.

2. The electric axial-flow counter-rotating fan according to claim 1, characterized in that: The motor stator assembly (24) includes a stator core (240) and a stator winding coil embedded in the stator core (240); the stator core (240) includes a plurality of stator teeth (243) uniformly arranged along the circumferential direction; stator slots (244) are formed between adjacent stator teeth (243); and the stator winding coil is wound around the stator teeth (243).

3. The electric axial-flow counter-rotating fan according to claim 2, characterized in that: The stator core (240) includes a first stator tooth portion (245) and a second stator tooth portion (246) extending axially, and the ratio of the axial length of the first stator tooth portion (245) to the second stator tooth portion (246) is equal to the ratio of the rated power of the first fan impeller (11) to the second fan impeller (12).

4. The electric axial-flow counter-rotating fan according to claim 1, wherein: The first motor rotor assembly (23) and the second motor rotor assembly (25) have the same structure, wherein the first motor rotor assembly (23) comprises a rotor back iron (230), a rotor magnetic steel (231) and a rotor sleeve (232), the rotor magnetic steel (231) being fixed to the mounting surface of the rotor back iron (230) and being spaced apart along the circumferential direction (C) of the rotor back iron, the rotor sleeve (232) being covered on the radial outer side of the rotor back iron (230), and the mounting surface of the rotor back iron (230) of the first motor rotor assembly (23) being opposite to the mounting surface of the rotor back iron (230) of the second motor rotor assembly (25).

5. The electric axial-flow counter-rotating fan according to claim 1, wherein: The dual-rotor motor (20) includes a first bearing (41), a second bearing (42), a third bearing (43) and a fourth bearing (44) arranged in sequence along the axial direction; wherein the first rotating shaft (21) is supported on or passes through the second bearing (42), the third bearing (43) and the fourth bearing (44) in sequence, and the second rotating shaft (22) is supported on or passes through the first bearing (41), the second bearing (42) and the fourth bearing (44) in sequence.

6. The electric axial-flow counter-rotating fan according to any one of claims 1 to 5, characterized in that: The counter-rotating fan comprises a first locking nut (51) and a second locking nut (52), wherein the first locking nut (51) locks the first fan impeller (11) to the second rotating shaft (22); and the second locking nut (52) locks the second fan impeller (12) to the first rotating shaft (21), and the first fan impeller (11) and the second fan impeller (12) are adjacently arranged on one axial side of the dual-rotor motor (20).

7. The electric axial-flow counter-rotating fan according to claim 1, characterized in that: The counter-rotating fan includes a cooling water jacket (29), and the dual-rotor motor (20) includes a front end cover (26) and a rear end cover (27) arranged coaxially, the front end cover (26) being arranged on the other axial side of the second rotating shaft (22), the front end cover (26) being rotatably connected to the second rotating shaft (22), and the front end cover (26) being connected to the cooling water jacket (29); The rear end cover (27) is rotatably connected to the first rotating shaft (21), and the rear end cover (27) is respectively connected to the fan guide support plate (30) and the cooling water jacket (29).

8. The electric axial-flow counter-rotating fan according to claim 1, wherein: The dual-rotor motor (20) includes a coaxially arranged tail end cover (28), the tail end cover (28) being arranged on one axial side of the second rotating shaft (22), a fifth bearing (45) being provided between the tail end cover (28) and the second rotating shaft (22), the tail end cover (28) being rotatably connected to the second rotating shaft (22) via the fifth bearing (45), and an outer ring of the tail end cover (28) covering the radial outer side of the impeller assembly (10) and being fixedly connected to the fan guide support plate (30).

9. The electric axial-flow counter-rotating fan according to any one of claims 1 to 8, characterized in that: The motor stator assembly (24) includes a first motor stator winding coil (241) and a second motor stator winding coil (242); The counter-rotating fan further comprises a motor controller electrically connected to the first motor stator winding coil (241) and the second motor stator winding coil (242); the motor controller is capable of independently controlling and adjusting the rotational speed and acceleration of the first motor rotor assembly (23) and the second motor rotor assembly (25).

10. The electric axial-flow counter-rotating fan according to any one of claims 1 to 8, characterized in that: The counter-rotating fan comprises a cooling water jacket (29) and two stator cores (240), wherein the two stator cores (240) are fixedly mounted axially side by side on the radial inner side of the cooling water jacket (29); the fan guide support plate (30) is provided with a plurality of high-voltage wire holes and a plurality of waterway openings, wherein the plurality of high-voltage wire holes are used to supply power to the dual-rotor motor (20), and the plurality of waterway openings comprise a water inlet and a water outlet, and the plurality of waterway openings are connected to the cooling water path of the cooling water jacket (29).

Images