Double-drive motor and clothes dryer using same

Abstract

The invention discloses a double-drive motor and a clothes dryer using the same. The double-drive motor comprises a first drive end motor unit and a second drive end motor unit which are independently controlled to operate. The first driving end motor unit comprises a first motor shaft, a first rotor assembly, a first stator assembly, a first side cover and a double-driving end cover; the second driving end motor unit comprises a second motor shaft, a second rotor assembly, a second stator assembly, a second side cover and a double-driving end cover; the output end of the first motor shaft is in driving connection with the machine barrel; the output end of the second motor shaft is in driving connection with the centrifugal wind wheel; the front projections of the first stator assembly and the second stator assembly are partially overlapped; compared with the prior art, a more excellent machine barrel driving effect and a more excellent centrifugal wind wheel driving effect can be achieved, meanwhile, the installation structure is compact, stable and reliable, the installation strength is guaranteed, noise caused by vibration is reduced, and the driving scheme is very suitable for being used as a driving scheme of the clothes dryer.

Description

[0001] The present invention relates to the field of motor driving for clothes dryers, and in particular to a dual-drive motor. The present invention also relates to a clothes dryer using the dual-drive motor. Background Art

[0002] As a household appliance, clothes dryers have been widely used. As one of the key core components of clothes dryers, the performance of clothes dryer motors directly determines the quality of clothes dryers. The current technology of clothes dryer motors is a dual output shaft drive mode of a single motor. Specifically, at the output shaft end A of the motor A centrifugal fan wheel is installed to transfer the heat energy generated by the heat pump to the dryer barrel, so that the objects in the dryer barrel are slowly dried; at the same time, a small pulley is pressed into the output shaft end B of the motor, and then the large pulley installed on the end cover is driven to rotate through the first-stage transmission, and the large pulley drives the dryer barrel to rotate through the belt. Through the two-stage transmission, the force of the motor is amplified and transmitted to the dryer barrel, so that the objects in the dryer barrel can be turned evenly to achieve the purpose of drying; the advantage of this solution is that the structure is simple, and the fan wheel and the dryer barrel are driven to rotate at the same time through the output shaft of the motor to achieve its drying purpose, but it also has many disadvantages: 1. Due to the working characteristics of the centrifugal fan, the motor can only rotate in one direction, which is understandable for air cooling, but for the dryer drum, it can only rotate in one direction. The objects in the dryer drum cannot be turned freely to be heated, and the quality of drying will be significantly reduced; 2. Further, for the dryer drum, the rotation speed is very important to the drying effect. If the speed is too high, the objects in the dryer will continue to rotate with the dryer drum, which will affect the heat entering the dryer drum and greatly reduce the drying effect. If the speed is too low, the objects in the dryer will fall by inertia before they reach the highest point, which will reduce the heating effect and increase the load. Under normal circumstances, the speed of the dryer drum is controlled at 50±5RPM for the best drying effect; however, once the speed of the dryer drum is fixed, the speed of the centrifugal impeller is determined, resulting in the air volume generated cannot be adjusted according to the drying effect of the dryer load. To a certain extent, it not only increases the drying time, but also consumes more energy; 3. The motor has two functions: to drive the centrifugal fan wheel and the dryer drum to rotate. Since the two load conditions are completely different, the motor must have sufficient power to ensure its operation during design, resulting in a relatively high design cost of the motor.

[0003] In addition, a certain amount of energy loss will be generated during the transmission of the motor torque, and the belt is a multi-V belt, and its transmission efficiency is generally around 95%. After two-stage transmission, it is reduced to around 90%, sacrificing about 5% of the transmission efficiency compared to the first-stage transmission; and the structure of the large pulley undertakes both the first-stage transmission and the second-stage transmission, which makes the pulley easy to wear and damage, especially the bearing supporting the pulley, which is extremely easy to be damaged, resulting in noise, vibration and other conditions after operation.

[0004] Therefore, the applicant hopes to seek a technical solution to solve the above technical problems. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a dual-drive motor and a dryer using the same, which can respectively achieve a more superior drum drive effect and a centrifugal impeller drive effect. At the same time, the installation structure of the present application is compact, stable and reliable, and the installation strength is guaranteed. The possibility of resonance generated by the dual output shaft drive of a single motor in the prior art is eliminated, and the noise caused by vibration is reduced, which is very suitable as a drive solution for a dryer.

[0006] The technical solution adopted by the present invention is as follows: A dual-drive motor comprises a first drive end motor unit and a second drive end motor unit which are independently controlled and operated; wherein: The first drive end motor unit comprises a first motor shaft, a first rotor assembly fixedly mounted on the first motor shaft, a first stator assembly located on the outer periphery of the first rotor assembly, and a first side cover and a dual-drive end cover rotatably sleeved on the outer periphery of the first motor shaft, and the first side cover and the dual-drive end cover are respectively fixedly mounted and connected to the first stator assembly; The second drive end motor unit comprises a second motor shaft, a second rotor assembly fixedly mounted on the second motor shaft, a second stator assembly located on the outer periphery of the second rotor assembly, and a second side cover and the dual-drive end cover which are relatively rotatably sleeved on the outer periphery of the second motor shaft, and the second side cover and the dual-drive end cover are respectively fixedly mounted and connected to the second stator assembly; The output end of the first motor shaft is drivingly connected to the barrel, and the output end of the second motor shaft is drivingly connected to the centrifugal impeller; The first motor shaft and the second motor shaft are parallel in the axial direction, and the front projections of the first stator assembly and the second stator assembly are partially overlapped.

[0007] Preferably, the output end of the first motor shaft is located on one side of the first side cover, and the output end of the second motor shaft is located on one side of the second side cover.

[0008] Preferably, a pulley is fixedly mounted on the output end of the first motor shaft, and the pulley is connected to the barrel via a belt in a primary transmission manner.

[0009] Preferably, the dual-drive end cover includes a first end cover unit for fixedly mounting and connecting to the first stator assembly and a second end cover unit for fixedly mounting and connecting to the second stator assembly; wherein the first end cover unit and the second end cover unit are an integrally formed structure, and the opening direction of the first end cover unit is opposite to the opening direction of the second end cover unit.

[0010] Preferably, a wiring harness opening is provided in the connection area between the first end cover unit and the second end cover unit; wherein the lead-out wiring harness of the first stator assembly and the lead-out wiring harness of the second stator assembly are both passed through the wiring harness opening and electrically connected to the wiring harness plug-in.

[0011] Preferably, the lead-out wiring harness of the first stator assembly and the lead-out wiring harness of the second stator assembly are electrically connected to the same wiring harness plug-in; wherein the wiring harness plug-in is provided with plug-in holes for electrically connecting to the lead-out wiring harnesses of each stator assembly.

[0012] Preferably, the rotational speed of the first drive-end motor unit is different from the rotational speed of the second drive-end motor unit; preferably, the rotational speed of the first drive-end motor unit is less than the rotational speed of the second drive-end motor unit.

[0013] Preferably, the outer diameter of the stator core of the first stator assembly is smaller than the outer diameter of the stator core of the second stator assembly, and the stack thickness of the stator core of the first stator assembly is greater than the stack thickness of the stator core of the second stator assembly.

[0014] Preferably, a clothes dryer adopts the dual-drive motor described above; wherein the barrel is a clothes dryer barrel of the clothes dryer, and the centrifugal wind wheel is a centrifugal wind wheel of the clothes dryer.

[0015] Preferably, the speed range of the first drive end motor unit is 800-1100RPM; the speed range of the second drive end motor unit is 2000-3000RPM; the RPM mentioned in this application refers to revolutions per minute.

[0016] The present application sets up a dual-drive motor solution consisting of a first drive-end motor unit and a second drive-end motor unit which are independently controlled and operated and are dual-driven at the same time. When implemented, the first drive-end motor unit is used to drive the barrel alone, and the second motor shaft is used to drive the centrifugal wind wheel alone. They will not restrict each other, and can respectively achieve a better barrel driving effect (the steering direction can be set according to actual needs and is no longer restricted by the unidirectional rotation of the centrifugal wind wheel) and a centrifugal wind wheel driving effect. At the same time, the present application adopts a dual-drive integrated installation solution in which the front projections of the dual-drive end cover, the first stator assembly and the second stator assembly are partially overlapped, which ensures the integrated installation performance of the dual-drive motor provided by the present application. The installation structure is compact, stable and reliable, and the installation strength is guaranteed, which is very suitable as a driving solution for a dryer. In addition, since the dual-drive motor of the present application adopts a driving structure solution with different motor shafts, the possibility of resonance generated by the dual output shaft drive of a single motor in the prior art is eliminated. Moreover, when the first drive-end motor unit of the present application is working, the second drive-end motor unit changes the center of mass of the first drive-end motor unit, increases the counterweight, and further reduces the noise caused by vibration.

[0017] The dual-drive end cover structure proposed in the present application ensures the assembly of the stator assemblies of two different motor shafts, and the first mounting portion and the second mounting portion are simultaneously arranged at the connection between the first end cover unit and the second end cover unit, so that the two are partially overlapped in the front projection, which not only saves space size but also increases the structural strength of the dual-drive end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a dual-drive motor in a specific implementation manner of the present invention; Figure 2 It is a schematic diagram of the side structure of a dual-drive motor in a specific embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of one end surface of a dual-drive motor according to a specific embodiment of the present invention; Figure 4 yes Figure 3 Section view in AA direction; Figure 5 It is a schematic diagram of the exploded structure of a dual-drive motor in a specific embodiment of the present invention; Figure 6 is a schematic diagram of the structure of a stator assembly in a dual-drive motor according to a specific embodiment of the present invention; Figure 7 It is a schematic diagram of the structure of the dual-drive motor end cover in a specific embodiment of the present invention; Figure 8 Yes Figure 7 Schematic diagram of the structure after rotation at a certain angle. DETAILED DESCRIPTION

[0019] The embodiment of the present invention discloses a dual-drive motor, comprising a first drive-end motor unit and a second drive-end motor unit which are independently controlled and operated; wherein the first drive-end motor unit comprises a first motor shaft, a first rotor assembly fixedly mounted on the first motor shaft, a first stator assembly located on the outer periphery of the first rotor assembly, and a first side cover and a dual-drive end cover which are relatively rotatably sleeved on the outer periphery of the first motor shaft, and the first side cover and the dual-drive end cover are respectively fixedly mounted and connected to the first stator assembly; the second drive-end motor unit comprises a second motor shaft, a second rotor assembly fixedly mounted on the second motor shaft, a second stator assembly located on the outer periphery of the second rotor assembly, and a second side cover and a dual-drive end cover which are relatively rotatably sleeved on the outer periphery of the second motor shaft, and the second side cover and the dual-drive end cover are respectively fixedly mounted and connected to the second stator assembly; the output end of the first motor shaft is drive-connected to the barrel, and the output end of the second motor shaft is drive-connected to the centrifugal impeller; the first motor shaft and the second motor shaft are parallel in the axial direction, and the front projections of the first stator assembly and the second stator assembly are partially overlapped.

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0021] This embodiment proposes a clothes dryer, which uses the dual-drive motor described below according to this embodiment, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a dual-drive motor 1 includes a first drive end motor unit 10 and a second drive end motor unit 20 which are independently controlled and operated (corresponding to different motor control units respectively); wherein, The first drive end motor 10 unit includes a first motor shaft 11, a first rotor assembly 12 fixedly mounted on the first motor shaft 11, a first stator assembly 13 located on the outer periphery of the first rotor assembly 12, and a first side cover 14 and a dual drive end cover 30 relatively rotatably sleeved on the outer periphery of the first motor shaft 11, and the first side cover 14 and the dual drive end cover 30 are respectively fixedly mounted and connected to the first stator assembly 13; The second drive end motor unit 20 includes a second motor shaft 21, a second rotor assembly 22 fixedly mounted on the second motor shaft 21, a second stator assembly 23 located on the outer periphery of the second rotor assembly 22, and a second side cover 24 and a dual drive end cover 30 relatively rotatably sleeved on the outer periphery of the second motor shaft 21, and the second side cover 24 and the dual drive end cover 30 are respectively fixedly mounted and connected to the second stator assembly 23; Preferably, in this embodiment, a pulley 40 is fixedly mounted on the output end of the first motor shaft 11, and the pulley 40 is connected to the barrel through a belt for primary transmission, eliminating the need for secondary transmission, thereby effectively improving transmission efficiency.

[0022] In the present embodiment, the output end of the first motor shaft 11 is drivingly connected to the barrel, and the output end of the second motor shaft 21 is drivingly connected to the centrifugal wind wheel, wherein the barrel is a dryer barrel of a clothes dryer, and the centrifugal wind wheel is a centrifugal wind wheel of a clothes dryer; preferably, in the present embodiment, in order to facilitate the driving output effect, the output end of the first motor shaft 11 is located on one side of the first side cover 14, and the output end of the second motor shaft 21 is located on one side of the second side cover 24; further preferably, in the present embodiment, the output end of the second motor shaft 21 is connected to the centrifugal wind wheel through a thread and an axis flat position, and shock-absorbing support pads 25 are respectively provided at both ends of the second motor shaft 21, and the dual-drive motor 1 is installed on the clothes dryer through the shock-absorbing support pads 25; Please see further Figure 6 As shown, in this embodiment, the first motor shaft 11 and the second motor shaft 21 are parallel in the axial direction, and the front projections of the first stator assembly 13 and the second stator assembly 23 are partially overlapped.

[0023] Preferably, in the present embodiment, the rotational speed of the first drive-end motor unit 10 is different from the rotational speed of the second drive-end motor unit 20; preferably, the rotational speed of the first drive-end motor unit 10 is less than the rotational speed of the second drive-end motor unit 20; further preferably, in the present embodiment, the rotational speed range of the first drive-end motor unit 10 is 800-1100RPM, more preferably 900-1000RPM, to ensure that after belt deceleration, the rotational speed of the dryer drum is controlled within the target range (usually set to about 50RPM). Since the rotational speed of the first drive-end motor unit 10 is significantly reduced, the noise and vibration defects caused by the high rotational speed are also eliminated, including vibration at the natural frequency, electromagnetic sound and friction sound, etc.; the rotational speed range of the second drive-end motor unit 20 is 2000-3000RPM, and the rotational speed of the second drive-end motor unit 20 can be flexibly adjusted according to the drying effect of the items, and the air volume of the centrifugal wind wheel can be changed, so as to obtain better drying effect and reduce energy consumption.

[0024] Preferably, in the present embodiment, the outer diameter of the stator core of the first stator assembly 13 is smaller than that of the stator core of the second stator assembly 23, and the stack thickness of the stator core of the first stator assembly 13 is greater than that of the stator core of the second stator assembly 23; in actual implementation, it can be comprehensively calculated according to the space capacity of the dryer and the strength of the motor mounting structure. Further preferably, in the present embodiment, the outer diameter range of the stator core of the first stator assembly 13 is set to 88-98 mm, and the outer diameter range of the stator core of the second stator assembly 23 is set to 104-112 mm; the stack thickness range of the stator core of the first stator assembly 13 is set to 25-35 mm, and the stack thickness range of the stator core of the second stator assembly 23 is set to 12-16 mm; the number of stator slots of the first drive-end motor unit 10 and the second drive-end motor unit 20 is 12, the number of rotor poles of the first drive-end motor unit 10 and the second drive-end motor unit 20 is 8 poles, the rated power is 60-100 W, and the motor efficiency is greater than 80%; Preferably, please further refer to Figure 7 and Figure 8 As shown, in the present embodiment, the double-drive end cover 30 includes a first end cover unit 31 for fixedly mounting and connecting with the first stator assembly 13 and a second end cover unit 32 for fixedly mounting and connecting with the second stator assembly 23; wherein, the first end cover unit 31 and the second end cover unit 32 are of an integrally formed structure, and the orientation of the opening 31a of the first end cover unit 31 is opposite to the orientation of the opening 32a of the second end cover unit 32; Preferably, in the present embodiment, the first end cover unit 31 includes a first shaft hole 31b at the center for inserting the first motor shaft 11; the second end cover unit 32 includes a second shaft hole 32b at the center for inserting the second motor shaft 21.

[0025] Preferably, in the present embodiment, the opening end face 31c of the first end cover unit 31 is provided with a plurality of first mounting parts 31d for fixedly mounting and connecting with the first stator assembly 13 and circumferentially spaced apart; the opening end face 32c of the second end cover unit 32 is provided with a plurality of second mounting parts 32d for fixedly mounting and connecting with the second stator assembly 23 and circumferentially spaced apart; further preferably, in order to facilitate the double-drive integrated installation effect of the double-drive end cover 30, in the present embodiment, at least 1 first mounting part 31d and at least 1 second mounting part 32d are provided in the connection area between the first end cover unit 31 and the second end cover unit 32; specifically preferably, in the present embodiment, both the first mounting part 31d and the second mounting part 32d adopt mounting holes; To ensure that after the dual-drive motor is installed on the dryer, the external mounting surface of the first drive-end motor unit 10 (i.e., the shape of the opening end face 31d of the first end-cover unit 31) is parallel to the cabinet of the dryer and to ensure that there is more space inside the dryer. Preferably, in this embodiment, the opening end face 31d of the first end-cover unit 31 is quadrilateral in shape, and the opening end face 32d of the second end-cover unit 32 is circular in shape.

[0026] Preferably, to facilitate the dual-drive integrated mounting strength of the dual-drive end cover 30, in this embodiment, a number of first reinforcing ribs 41 are provided on the first end-cover surface 31e between the first shaft hole 31b and the first mounting portion 31d; a number of second reinforcing ribs 42 are provided on the second end-cover surface 32e between the second shaft hole 32b and the second mounting portion 32d; Further preferably, in this embodiment, a connecting reinforcing rib 43 is provided in the connecting area between the first end-cover unit 31 and the second end-cover unit 32, and both ends of the connecting reinforcing rib 43 are connected to the first reinforcing rib 41 and the second reinforcing rib 42.

[0027] To facilitate the corresponding assembly effect, preferably, in this embodiment, the opening end face 31d of the first end-cover unit 31, the first side cover 14 and the first stator assembly 13 are fixedly installed and connected; the opening end face 32d of the second end-cover unit 32, the second stator assembly 23 and the second side cover 24 are fixedly installed and connected, so that the second stator assembly 23 is placed inside the inner space of the housing formed by the fixed connection of the second end-cover unit 32 and the second side cover 24.

[0028] Preferably, in the present embodiment, a wiring harness opening 50 is provided in the connection area between the first end cover unit 31 and the second end cover unit 32, wherein the lead-out wiring harness of the first stator assembly 13 (not shown in the figure) and the lead-out wiring harness of the second stator assembly 23 (not shown in the figure) are both passed through the wiring harness opening 50 and electrically connected to the wiring harness plug-in 60, so that the lead-out wiring harnesses of the two stator assemblies (i.e., the first stator assembly 13 and the second stator assembly 23) in a back-to-back shape are bundled together, and then centrally led out through the unified wiring harness opening 50 on the dual-drive end cover 30, so that the wiring harness of the motor is neater and less messy; further preferably, in the present embodiment, the lead-out wiring harness of the first stator assembly 13 and the lead-out wiring harness of the second stator assembly 23 are connected to the same wiring harness opening 50. A wiring harness plug-in 60 (the wiring harness plug-in 60 is connected to the control unit corresponding to each motor unit) is electrically connected; wherein, the wiring harness plug-in 60 is provided with plug-in holes for electrically connecting with the lead-out wiring harnesses of each stator assembly 13, 23; for example, the number of plug-in holes of the wiring harness plug-in is recommended to be set between 6 and 10, which can be set to a single row or a double row, wherein three lead-out wiring harnesses are used to drive the first drive end motor unit 10, and the other three lead-out wiring harnesses are used to drive the second drive end motor unit 20, and the lead-out wiring harnesses of the two independently controlled motor units are integrated on a wiring harness plug-in 60, so that the lead-out wiring harness of the dual-drive motor is more regular, and the number of wiring harness plug-ins is reduced, thereby reducing costs.

[0029] Preferably, in this embodiment, the dual-drive end cover 30, the first side cover 14 and the second side cover 24 are made of metal or plastic material, which can be selected according to actual needs, and this application does not make the sole limitation; specifically preferably, in this embodiment, the dual-drive end cover 30, the first side cover 14 and the second side cover 24 are all made of aluminum alloy.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A dual-drive motor, characterized in that: It includes a first drive end motor unit and a second drive end motor unit which are independently controlled and operated; wherein, The first drive end motor unit comprises a first motor shaft, a first rotor assembly fixedly mounted on the first motor shaft, a first stator assembly located on the outer periphery of the first rotor assembly, and a first side cover and a dual-drive end cover rotatably sleeved on the outer periphery of the first motor shaft, and the first side cover and the dual-drive end cover are respectively fixedly mounted and connected to the first stator assembly; The second drive end motor unit comprises a second motor shaft, a second rotor assembly fixedly mounted on the second motor shaft, a second stator assembly located on the outer periphery of the second rotor assembly, and a second side cover and the dual-drive end cover which are relatively rotatably sleeved on the outer periphery of the second motor shaft, and the second side cover and the dual-drive end cover are respectively fixedly mounted and connected to the second stator assembly; The output end of the first motor shaft is drivingly connected to the barrel, and the output end of the second motor shaft is drivingly connected to the centrifugal impeller; The first motor shaft and the second motor shaft are parallel in the axial direction, and the front projections of the first stator assembly and the second stator assembly are partially overlapped.

2. The dual-drive motor according to claim 1, characterized in that: The output end of the first motor shaft is located at one side of the first side cover, and the output end of the second motor shaft is located at one side of the second side cover.

3. The dual-drive motor according to claim 1, characterized in that: A pulley is fixedly mounted on the output end of the first motor shaft, and the pulley is connected to the barrel through a belt for primary transmission.

4. The dual-drive motor according to claim 1, characterized in that: The dual-drive end cover includes a first end cover unit for fixedly mounting and connecting with the first stator assembly and a second end cover unit for fixedly mounting and connecting with the second stator assembly; wherein the first end cover unit and the second end cover unit are an integrally formed structure, and the opening direction of the first end cover unit is opposite to the opening direction of the second end cover unit.

5. The dual-drive motor according to claim 4, characterized in that: A wiring harness opening is provided in the connection area between the first end cover unit and the second end cover unit; wherein the lead-out wiring harness of the first stator assembly and the lead-out wiring harness of the second stator assembly are both passed through the wiring harness opening and electrically connected to the wiring harness plug-in.

6. The dual-drive motor according to claim 5, characterized in that: The lead-out wire harness of the first stator assembly and the lead-out wire harness of the second stator assembly are electrically connected to the same wire harness plug-in; wherein the wire harness plug-in is provided with a plug-in hole for electrically connecting with the lead-out wire harnesses of each stator assembly.

7. The dual-drive motor according to claim 1, characterized in that: The rotation speed of the first drive-end motor unit is different from the rotation speed of the second drive-end motor unit; preferably, the rotation speed of the first drive-end motor unit is less than the rotation speed of the second drive-end motor unit.

8. The dual-drive motor according to claim 1 or 7, characterized in that: The outer diameter of the stator core of the first stator assembly is smaller than the outer diameter of the stator core of the second stator assembly, and the stack thickness of the stator core of the first stator assembly is greater than the stack thickness of the stator core of the second stator assembly.

9. A clothes dryer, characterized in that: A dual-drive motor according to any one of claims 1 to 8 is used; wherein the barrel is a dryer barrel of a clothes dryer, and the centrifugal wind wheel is a centrifugal wind wheel of a clothes dryer.

10. The clothes dryer according to claim 9, characterized in that: The speed range of the first drive end motor unit is 800-1100RPM; the speed range of the second drive end motor unit is 2000-3000RPM.

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