An inner circulation heat dissipation electric roller

Abstract

The application discloses an internal circulation heat dissipation electric roller, which comprises a roller device, a motor device and a transmission device, a first ventilation channel is formed between the transmission device and the roller device, a second ventilation channel is formed between the motor device and the roller device, a third ventilation channel is formed between the motor device and the roller device, the motor device comprises a motor shell, a motor stator, a motor rotor and a heat dissipation fan, the motor rotor and the heat dissipation fan are fixed on a motor output shaft respectively, the motor shell is provided with a front ventilation channel at a front end and a rear ventilation channel at a rear end, the heat dissipation fan can rotate with the motor output shaft to fan the air in a closed roller chamber, and the air flows in the closed roller chamber in sequence through the motor chamber, the front ventilation channel, the first ventilation channel, the second ventilation channel, the third ventilation channel, the rear ventilation channel and the motor chamber. The electric roller can realize internal circulation heat dissipation of the electric roller, avoids overheating of the electric roller during long-time work, prolongs the service life of the electric roller and has high practicability.

Description

Technical Field

[0001] This invention relates to the field of electric rollers, and more particularly to an electric roller with internal circulation cooling. Background Technology

[0002] An electric roller conveyor is a new type of drive device that places the motor inside the roller. It is mainly used in stationary and mobile belt conveyors, replacing traditional separate drive devices where the motor is located outside the drive roller. Electric roller conveyors offer many advantages, including compact structure, small footprint, and easy installation.

[0003] Most electric rollers currently on the market, like the invention patent titled "Electric Roller" (publication number: CN108832767B), place the motor inside the roller body. A transmission structure located between the motor's output shaft and the roller body drives the roller body to rotate with the motor's output shaft. However, in practical applications, electric rollers have high power requirements, and these rollers lack a cooling system, resulting in poor heat dissipation and a short service life. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing an electric roller with internal circulation cooling, which enables circulating heat dissipation inside the electric roller, preventing overheating during prolonged operation, extending the service life of the electric roller, and demonstrating strong practicality.

[0005] The technical solution adopted in this invention is as follows:

[0006] An electric roller with internal circulation cooling includes a roller assembly with an internally enclosed roller chamber, and a motor assembly and a transmission assembly respectively arranged within the roller chamber. The transmission assembly is tractively connected between the motor output shaft of the motor assembly and the roller assembly. The motor assembly and the transmission assembly are axially supported on an external support frame via front and rear support shafts. The front end of the roller assembly is rotatably connected to the front support shaft, and the rear end of the roller assembly is rotatably connected to the rear support shaft. The transmission assembly and the inner wall of the roller assembly are arranged with a gap to form a first ventilation channel. The motor assembly and the inner wall of the roller assembly are arranged with a gap to form a second ventilation channel communicating with the first ventilation channel. The motor assembly and the rear end wall of the roller assembly are arranged at intervals to form a second ventilation channel communicating with the second ventilation channel. The third ventilation duct; the motor device includes a motor housing with an internal motor chamber, and a motor stator, a motor rotor, and a cooling fan arranged in the motor chamber. The two ends of the motor output shaft are rotatably connected to the front and rear ends of the motor housing, respectively. The motor rotor and the cooling fan are fixed on the motor output shaft. The front end of the motor housing is provided with a front ventilation duct connecting the motor chamber and the first ventilation duct, and the rear end of the motor housing is provided with a rear ventilation duct connecting the motor chamber and the third ventilation duct. The cooling fan can rotate with the motor output shaft to fan the air in the closed roller chamber in sequence through the motor chamber, the front ventilation duct, the first ventilation duct, the second ventilation duct, the third ventilation duct, the rear ventilation duct, and the motor chamber, circulating in the closed roller chamber.

[0007] Preferably, the inner sidewall of the roller device is respectively provided with a first return fan assembly arranged around the first ventilation duct and a second return fan assembly arranged around the third ventilation duct. The roller device can rotate around the first rotation direction under the drive of the motor output shaft and the transmission device. When the roller device rotates around the first rotation direction, it drives the first return fan assembly and the second return fan assembly to rotate and fan air. The air outlet direction of the first return fan assembly is arranged in the opposite direction to the air outlet direction of the cooling fan, and the air outlet direction of the second return fan assembly is arranged in the same direction as the air outlet direction of the cooling fan.

[0008] Preferably, the roller device includes a roller structure, a roller front cover sealed to the front end of the roller structure, and a roller rear cover sealed to the rear end of the roller structure. The roller structure, the roller front cover, and the roller rear cover surround to form the closed roller chamber. The first return fan assembly is disposed on the inner wall of the roller structure and arranged between the roller front cover and the front end of the motor device. The second return fan assembly is disposed on the inner wall of the roller structure and arranged between the roller rear cover and the rear end of the motor device.

[0009] Preferably, the first recirculation fan assembly includes a plurality of first recirculation fan blades protruding from the inner wall of the roller device along a first spiral path. The distance between the beginning of the first spiral path and the rear end of the roller device is greater than the distance between the end of the first spiral path and the rear end of the roller device. The first spiral path is arranged from the beginning to the end of the first spiral path along a second rotation direction opposite to the first rotation direction. The second recirculation fan assembly includes a plurality of second recirculation fan blades protruding from the inner wall of the roller device along a second spiral path. The distance between the beginning of the second spiral path and the rear end of the roller device is greater than the distance between the end of the second spiral path and the rear end of the roller device. The second spiral path is arranged from the beginning to the end of the second spiral path along the first rotation direction.

[0010] Preferably, a fourth ventilation duct is provided through the motor rotor, with the front end of the fourth ventilation duct connected to the front part of the motor chamber and the rear end of the fourth ventilation duct connected to the rear part of the motor chamber.

[0011] Preferably, the motor rotor has a plurality of fourth ventilation channels extending from its rear end to its front end, and the plurality of fourth ventilation channels are arranged along the circumferential direction of the motor output shaft.

[0012] Preferably, the front end face of the motor housing has multiple front ventilation channels along its outer periphery, and the front end of the motor stator is spaced apart from the inner wall of the front end of the motor housing to form a fifth ventilation channel communicating with each of the front ventilation channels; and / or,

[0013] The rear end face of the motor housing is provided with a plurality of rear ventilation channels, and the rear end of the motor stator and the inner wall of the rear end of the motor housing are arranged at intervals to form a sixth ventilation channel that communicates with each of the rear ventilation channels.

[0014] Preferably, the motor rotor includes a rotor body coaxially fixed on the motor output shaft and a plurality of magnets attached to the outer peripheral sidewall of the rotor body. The outer peripheral sidewall of the rotor body is provided with a plurality of magnet slots arranged along its axial direction in its circumferential direction and a plurality of seventh ventilation channels arranged between adjacent magnet slots. The magnets are attached to the magnet slots. The front end of the seventh ventilation channel is connected to the front part of the motor chamber and the rear end of the seventh ventilation channel is connected to the rear part of the motor chamber.

[0015] Preferably, a stirring bar is provided radially along the rotor body inside the seventh ventilation duct, the stirring bar is arranged axially along the rotor body, and the cooling fan is arranged between the rear side of the motor rotor and the rear ventilation duct.

[0016] Preferably, the rear end of the motor housing is provided with a first wire passage through which the motor lead wire extends out of the motor housing, and the rear support shaft is provided with a second wire passage through the outer end of the rear support shaft. The side wall of the rear support shaft is provided with a wire hole that connects to the second wire passage. The motor lead wire passes through the wire hole and is led out to the outside along the second wire passage.

[0017] The beneficial effects achieved by this invention are as follows:

[0018] The electric roller provided by this invention, by installing a cooling fan inside the motor housing, with the cooling fan and motor rotor respectively fixed on the motor output shaft, allows the motor output shaft and cooling fan to rotate coaxially when the motor rotor rotates relative to the motor stator. The cooling fan, rotating and fanning air, causes the air inside the enclosed roller chamber to flow sequentially through the motor chamber within the motor housing, through a front ventilation duct at the front end of the motor housing, and into a first ventilation duct formed between the transmission device and the inner wall of the roller assembly. This simultaneously cools the inside of the motor assembly and the outside of the transmission device. The air flowing into the first ventilation duct, after impacting the front wall of the roller assembly or the transmission device, is propelled by the rebound force, sequentially through the first ventilation duct and a second ventilation duct formed along the inner wall of the motor assembly and the roller assembly, returning to a third ventilation duct formed between the rear end wall of the motor assembly and the roller assembly. This again cools the outside of the transmission device and the outside of the motor assembly. The airflow to the third ventilation duct, under the suction of the cooling fan, flows sequentially through the third ventilation duct and the rear ventilation duct located at the rear end of the motor housing, returning to the motor chamber. This creates a circulating flow within the enclosed roller chamber, achieving internal heat dissipation of the electric roller, preventing overheating during prolonged operation, extending its service life, and demonstrating strong practicality. Furthermore, during the air circulation, the heat generated by the motor and transmission devices exchanges heat with the sections of the roller assembly located near the first, second, and third ventilation ducts, dissipating the heat to the outside through the roller assembly. The first, second, and third ventilation ducts are located close to the inner side of the roller assembly, maximizing the contact area between the heat source and the roller assembly, as well as the contact area between the roller assembly and the outside environment. This allows for rapid temperature reduction of the roller assembly, thus achieving overall heat dissipation for the electric roller.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of an electric roller according to an embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional structural schematic diagram of an electric roller according to an embodiment of the present invention.

[0023] Figure 3 This is a partial structural diagram of a motor device according to an embodiment of the present invention. Figure 1 .

[0024] Figure 4 This is a partial structural diagram of an electric roller according to an embodiment of the present invention. Figure 2 .

[0025] Figure 5 This is a partial structural diagram of an electric roller according to an embodiment of the present invention. Figure 3 .

[0026] Figure 6 This is a cross-sectional view of a motor device according to an embodiment of the present invention.

[0027] Figure 7 This is a partial structural diagram of a motor device according to an embodiment of the present invention. Figure 1 .

[0028] Figure 8 This is a partial structural diagram of a motor device according to an embodiment of the present invention. Figure 2 .

[0029] Figure 9 This is a partial exploded view of the motor device according to an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the structure of a cooling fan according to an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the structure of the motor rear cover according to an embodiment of the present invention.

[0032] Figure 12 This is a schematic diagram of the structure of the motor front cover according to an embodiment of the present invention.

[0033] Reference numerals: Roller assembly 1, Roller structure 11, First return fan assembly 111, Second return fan assembly 112, Roller front cover 12, Roller rear cover 13, Motor assembly 2, Motor output shaft 21, Shaft shoulder 211, Limiting ring 212, Motor housing 22, Motor casing 221, Motor front cover 222, Motor rear cover 223, Rear cover reinforcing rib 224, Front cover reinforcing rib 225, Motor stator 23, Motor rotor 24, Rotor body 241, Magnet slot 2411, Stirring bar 2412, Magnet sheet 242, Cooling fan 25, Fan hub 251, Fan blade 252, First limiting plane 253, Front ventilation duct 26, Rear... Ventilation duct 27, first wire passage 28, motor lead wire 29, transmission device 3, reduction structure 31, reduction output shaft 311, gear transmission structure 32, front support shaft 4, rear support shaft 5, second wire passage 51, wire hole 52, first bearing 61, second bearing 62, third bearing 63, fourth bearing 64, first ventilation duct 10, second ventilation duct 20, third ventilation duct 30, fourth ventilation duct 40, fifth ventilation duct 50, sixth ventilation duct 60, seventh ventilation duct 70, eighth ventilation duct 80, ventilation slot 1 801, ventilation slot 2 802, ventilation slot 3 803, connecting slot 804, first rotation direction M, second rotation direction N. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0039] like Figures 1-12As shown in the figure, as an embodiment of the present invention, an electric roller with internal circulation cooling is provided, including a roller device 1 having an internally enclosed roller chamber, and a motor device 2 and a transmission device 3 respectively arranged in the enclosed roller chamber. The transmission device 3 is tractively connected between the motor output shaft 21 of the motor device 2 and the roller device 1. The motor device 2 and the transmission device 3 are axially supported on an external support frame by a front support shaft 4 and a rear support shaft 5. The front end of the roller device 1 is rotatably connected to the front support shaft 4, and the rear end of the roller device 1 is rotatably connected to the rear support shaft 5, so that the roller device 1 can rotate around the axes of the front support shaft 4 and the rear support shaft 5 under the drive of the motor device 2 and the power transmission of the transmission device 3. The transmission device 3 is arranged with a gap to the inner wall of the roller device 1 to form a first ventilation channel 10. The motor device 2 is arranged with a gap to the inner wall of the roller device 1 to form a second ventilation channel 20 communicating with the first ventilation channel 10. The motor device 2 is arranged with a space between the rear end wall of the roller device 1 to form a third ventilation channel 30 communicating with the second ventilation channel 20. The motor device 2 includes a motor housing 22 with an internal motor chamber, and a motor stator 23, a motor rotor 24, and a cooling fan 25 arranged in the motor chamber. The two ends of the motor output shaft 21 are rotatably connected to the front and rear ends of the motor housing 22, respectively. The motor rotor 24 and the cooling fan 25 are fixed on the motor output shaft 21. The front end of the motor housing 22 is provided with a front ventilation duct 26 that connects the motor chamber and the first ventilation duct 10, and the rear end of the motor housing 22 is provided with a rear ventilation duct 27 that connects the motor chamber and the third ventilation duct 30. The cooling fan 25 can rotate with the motor output shaft 21 to fan the air in the closed roller chamber to circulate in the closed roller chamber through the motor chamber, the front ventilation duct 26, the first ventilation duct 10, the second ventilation duct 20, the third ventilation duct 30, the rear ventilation duct 27, and the motor chamber.In this embodiment, the electric roller has a cooling fan 25 installed inside the motor housing 22. The cooling fan 25 and the motor rotor 24 are respectively fixed on the motor output shaft 21. When the motor rotor 24 rotates relative to the motor stator 23, it can drive the motor output shaft 21 and the cooling fan 25 to rotate coaxially. The cooling fan 25 rotates and blows air, thereby allowing the air in the closed roller chamber to flow sequentially through the motor chamber inside the motor housing 22, through the front ventilation duct 26 at the front end of the motor housing 22, and to the first ventilation duct 10 formed between the transmission device 3 and the inner wall of the roller device 1. At the same time, it dissipates heat and cools the inside of the motor device 2 and the outside of the transmission device 3. The air flowing to the first ventilation duct 10 impacts the front wall of the roller device 1 or the transmission device 3 and, under the rebound of the wind force, flows sequentially through the first ventilation duct 10 and the second ventilation duct 20 formed between the inner wall of the motor device 2 and the roller device 1, returning to the third ventilation duct 30 formed between the rear end wall of the motor device 2 and the roller device 1. At the same time, it dissipates heat and cools the outside of the transmission device 3 and the outside of the motor device 2. The airflow is cooled and dissipated externally. The air flowing to the third ventilation duct 30 is then drawn by the cooling fan 25 and returns to the motor chamber through the third ventilation duct 30 and the rear ventilation duct located at the rear end of the motor housing 22. This creates a circulating flow within the closed roller chamber, enabling heat dissipation inside the electric roller, preventing overheating during prolonged operation, extending the service life of the electric roller, and demonstrating strong practicality. In addition, during the air circulation, the heat source generated by the motor device 2 and the transmission device 3 exchanges heat with the parts of the roller device 1 located near the first ventilation duct 10, the second ventilation duct 20, and the third ventilation duct 30. This dissipates the heat source to the outside through the roller device 1. The first ventilation duct 10, the second ventilation duct 20, and the third ventilation duct 30 are located close to the inner side of the roller device 1, resulting in a large contact area for heat exchange between the heat source and the roller device 1, as well as a large contact area for heat exchange between the roller device 1 and the outside environment. This also allows for rapid temperature reduction of the roller device 1, thereby achieving heat dissipation for the entire electric roller.

[0040] like Figure 2As shown, in some specific embodiments, the inner sidewall of the roller device 1 is respectively provided with a first return fan assembly 111 arranged around the first ventilation duct 10 and a second return fan assembly 112 arranged around the third ventilation duct 30. The roller device 1 can rotate around the first rotation direction M under the drive of the motor output shaft 21 and the transmission device 3. When the roller device 1 rotates around the first rotation direction M, it drives the first return fan assembly 111 and the second return fan assembly 112 to rotate and fan. The air outlet direction of the first return fan assembly 111 is arranged in the opposite direction to the air outlet direction of the cooling fan 25, and the air outlet direction of the second return fan assembly 112 is arranged in the same direction as the air outlet direction of the cooling fan 25. In this embodiment, the roller device 1 and the first return fan assembly 111 and the second return fan assembly 112 disposed on its inner sidewall rotate and fan air under the transmission of the transmission device 3 along with the output shaft 21 of the motor. The air outlet direction of the first return fan assembly 111 is arranged in the opposite direction to the air outlet direction of the cooling fan 25, and the air outlet direction of the second return fan assembly 112 is arranged in the same direction as the air outlet direction of the cooling fan 25. This allows the air flowing to the first ventilation duct 10 to hit the front wall of the roller device 1 or the transmission device 3 and simultaneously flow towards the second ventilation duct 20 under the rebound of the wind force and the fanning of the first return fan assembly 111. The air flowing to the third ventilation duct 30 is simultaneously flowed into the motor cavity under the suction of the cooling fan 25 and the fanning of the second return fan assembly 112, thereby accelerating the air circulation in the closed roller cavity and improving the heat dissipation and cooling effect.

[0041] like Figure 2 As shown, in some specific embodiments, the roller device 1 includes a roller structure 11, a front roller cover 12 sealed to the front end of the roller structure 11, and a rear roller cover 13 sealed to the rear end of the roller structure 11. The roller structure 11, the front roller cover 12, and the rear roller cover 13 surround and form the closed roller chamber. The front and rear ends of the roller structure 11 are sealed by the front roller cover 12 and the rear roller cover 13, improving the sealing performance, reducing oil leakage, and avoiding affecting the friction coefficient between the roller device 1 and the external conveyor belt. This prevents the external conveyor belt from slipping relative to the roller device 1, ensuring that the roller device 1 can frictionally drive the external conveyor belt to rotate stably, thereby ensuring the normal operation of the belt conveyor. Furthermore, the improved sealing facilitates later maintenance. The roller structure 11 is designed as a cylindrical structure, which facilitates the rotation of the external conveyor belt.

[0042] In some specific embodiments, the transmission device 3 includes a reduction structure 31 connected to the motor output shaft 21, and a gear transmission structure 32 connected between the reduction output shaft 311 of the reduction structure 31 and the front cover 12 of the roller. The reduction structure 31 can reduce the output power of the motor output shaft 21 and increase the torque, and the gear transmission structure 32 can transmit the output power of the reduction output shaft 311 to the front cover 12 of the roller, thereby driving the roller device 1 to rotate. The first ventilation duct 10 is formed by the gap between the reduction structure 31 and the gear transmission structure 32 and the inner wall of the roller structure 11. When the airflow reaches the first ventilation duct 10, it can exchange heat with the outer periphery of the reduction structure 31 and the gear transmission structure 32, thereby dissipating heat and cooling the reduction structure 31 and the gear transmission structure 32, avoiding overheating of the gear transmission structure 32 during long-term operation, thereby reducing the risk of gear wear and extending the service life of the gear transmission structure 32 and the reduction structure 31.

[0043] like Figure 2 As shown, in some specific embodiments, the motor housing 22 includes a motor housing 221, a front cover 222 connected to the front end of the motor housing 221, and a rear cover 223 connected to the rear end of the motor housing 221. The motor chamber is formed by the motor housing 221, the front cover 222, and the rear cover 223. The front end of the motor output shaft 21 is rotatably connected to the front cover 222, and the rear end of the motor output shaft 21 is rotatably connected to the rear cover 223. A front ventilation duct 26 is disposed through the front cover 222, and a rear ventilation duct 27 is disposed through the rear cover 223. The motor output shaft 21 is rotatably connected to the front cover 222 via a first bearing 61, and the motor output shaft 21 is rotatably connected to the rear cover 223 via a second bearing 62, facilitating the rotation of the motor output shaft 21 relative to the motor housing 222. Figure 5 As shown, the inner wall of the motor rear cover 223 is provided with multiple rear cover reinforcing ribs 224. These reinforcing ribs 224 are arranged radially along the circumference of the motor rear cover 223. Multiple rear ventilation channels 27 are arranged between adjacent reinforcing ribs 224, and the rear ventilation channels 27 are designed in a fan shape. This increases the ventilation volume of the motor rear cover 223 while ensuring the structural stability of the motor rear cover 223. Figure 6 As shown, the inner wall of the motor front cover 222 is provided with multiple front cover reinforcing ribs 225. The multiple front cover reinforcing ribs 225 are arranged radially along the circumferential direction of the motor front cover 222. Multiple front ventilation channels 26 are arranged between two adjacent front cover reinforcing ribs 225, and the front ventilation channels 26 are set as fan-shaped structures, thereby increasing the ventilation volume of the motor front cover 222 while ensuring the structural stability of the motor front cover 222.

[0044] like Figure 2As shown, in some specific embodiments, the front support shaft 4 is rotatably connected to the front cover 12 of the roller, with its rear end extending into the roller cavity and positioned and connected to the gear transmission structure 32, and its front end extending out of the front cover 12 and positioned and connected to the external support frame. The rear support shaft 5 is rotatably connected to the rear cover 13 of the roller, with its front end extending into the roller cavity and positioned and connected to the rear cover 223 of the motor, and its rear end extending out of the rear cover 13 and positioned and connected to the external support frame. The front support shaft 4 and the front cover 12 of the roller are rotatably connected via a third bearing 63, and the rear support shaft 5 and the rear cover 13 of the roller are rotatably connected via a fourth bearing 64, facilitating the rotation of the roller device 1 relative to the front support shaft 4 and the rear support shaft 5. The motor rear cover 223 is fixed to the motor housing 221 by fasteners such as screws and bolts. The rear support shaft 5 is connected to the motor rear cover 223 by interference fit, which is easy to install. The rear support shaft 5 and the motor rear cover 223 are circumferentially limited by keys and keyways, which can prevent the motor rear cover 223 from rotating relative to the rear support shaft 5, thereby ensuring that the motor device 2 is stationary when the roller device 1 rotates.

[0045] like Figure 2 As shown, in some specific embodiments, the first return fan assembly 111 is disposed on the inner wall of the roller structure 11 and arranged between the front cover 12 of the roller and the front end of the motor device 2, and the second return fan assembly 112 is disposed on the inner wall of the roller structure 11 and arranged between the rear cover 13 of the roller and the rear end of the motor device 2. The structure is simple and stable. In other embodiments, the first return fan assembly 111 can also be disposed on the front cover 12 of the roller via a connecting bracket, or the second return fan assembly 112 can also be disposed on the rear cover 13 of the roller via a connecting bracket.

[0046] like Figure 3As shown, in some specific embodiments, the first return fan assembly 111 includes a plurality of first return fan blades that are respectively protruding along the first spiral path on the inner side wall of the roller device 1, i.e., the inner side wall of the roller structure 11 in this embodiment. The distance between the first spiral path and the rear end of the roller device 1, i.e., the roller rear cover 13 in this embodiment, is greater than the distance between the first spiral path and the rear end of the roller device 1, i.e., the roller rear cover 13 in this embodiment. The first spiral path is arranged from the first spiral path to the first spiral path along the second rotation direction N, which is opposite to the first rotation direction M, to ensure that each first return fan blade can fan the air in the first ventilation duct 10 toward the second ventilation duct 20 when the roller device 1 rotates along the first rotation direction M. The second return fan assembly 112 includes multiple second return fan blades that are respectively protruding along the second spiral path on the inner side wall of the roller device 1, i.e., the inner side wall of the roller structure 11 in this embodiment. The distance between the first end of the second spiral path and the rear end of the roller device 1, i.e., the rear cover 13 of the roller in this embodiment, is greater than the distance between the tail end and the rear end of the roller device 1, i.e., the rear cover 13 of the roller in this embodiment. The second spiral path is arranged from the first end to the tail end along the first rotation direction, ensuring that each second return fan blade can fan the air in the third ventilation duct 30 towards the rear ventilation duct 27 when the roller device 1 rotates along the first rotation direction M.

[0047] In some specific embodiments, a set of first return fan blades is arranged on the same radial plane of the inner wall of the roller device 1, i.e., the inner wall of the roller structure 11 in this embodiment. The set of first return fan blades includes at least two first return fan blades. When the roller device 1 rotates along the first rotation direction M, it can drive the set of first return fan blades to fan the air in the first ventilation duct 10 towards the second ventilation duct 20, thereby improving the fan efficiency. A set of second return fan blades is arranged on the same radial plane of the inner wall of the roller device 1, i.e., the inner wall of the roller structure 11 in this embodiment. The set of second return fan blades includes at least two second return fan blades. When the roller device 1 rotates along the first rotation direction M, it can drive the set of second return fan blades to fan the air in the third ventilation duct 30 towards the rear ventilation duct 27, thereby improving the fan efficiency. In this embodiment, the set of first return fan blades is set to three first return fan blades, and the set of second return fan blades is set to three second return fan blades. In other embodiments, other numbers may also be used.

[0048] In some specific embodiments, the first recirculation fan assembly 111 includes at least two sets of first recirculation fan blades, with adjacent sets of first recirculation fan blades spaced apart along the axial direction of the roller device 1, further improving the fan efficiency. The second recirculation fan assembly 112 includes at least two sets of second recirculation fan blades, with adjacent sets of second recirculation fan blades spaced apart along the axial direction of the roller device 1, further improving the fan efficiency. In this embodiment, the first recirculation fan assembly 111 is configured with two sets of first recirculation fan blades, and the second recirculation fan assembly 112 is configured with six sets of first recirculation fan blades; in other embodiments, other numbers may also be used.

[0049] like Figures 7-9 As shown, in some specific embodiments, a fourth ventilation duct 40 is provided through the motor rotor 24. The front end of the fourth ventilation duct 40 is connected to the front part of the motor chamber, and the rear end of the fourth ventilation duct 40 is connected to the rear part of the motor chamber. This allows the cooling fan 25 to rotate with the motor output shaft 21, fanning the air in the roller device 1 to flow through the third ventilation duct 30, the rear ventilation duct 27, the fourth ventilation duct 40, and the front ventilation duct 26 to the first ventilation duct 10. This allows the air in the motor chamber to pass through the interior of the motor rotor 24 and exchange heat with the motor rotor 24, thereby achieving good heat dissipation and cooling of the motor rotor 24, preventing the motor rotor 24 from overheating for a long time, and extending the service life of the motor device 2. In addition, the air in the motor chamber can also pass through the gap between the motor rotor 24 and the motor stator 23, and exchange heat with the outer wall of the motor rotor 24 and the inner wall of the motor stator 23, thereby achieving heat dissipation and cooling of the motor rotor 24 and the motor stator 23.

[0050] In some specific embodiments, a plurality of fourth ventilation channels 40 are provided through the motor rotor 24 from its rear end to its front end, and the plurality of fourth ventilation channels 40 are arranged along the circumferential direction of the motor output shaft 21. The arrangement of the plurality of fourth ventilation channels 40 increases the heat exchange area, which is more conducive to heat dissipation and cooling of the motor rotor 24. In this embodiment, eight fourth ventilation channels 40 are evenly arranged along the fourth ventilation channel 40, which can effectively dissipate heat and cool the inside of the motor rotor 24. The fourth ventilation channels 40 are arranged parallel to the motor output shaft 21, which facilitates manufacturing. In other embodiments, the fourth ventilation channels 40 can also be arranged in a spiral shape around the motor output shaft 21.

[0051] like Figure 6As shown, in some specific embodiments, the cooling fan 25 is arranged between the rear side of the motor rotor 24 and the motor stator 23 and the rear ventilation duct 27, facilitating the intake of air from the third ventilation duct 30 into the motor cavity via the rear ventilation duct 27, and then blown into the first ventilation duct 10 via the fourth ventilation duct 40 or the gap between the motor rotor 24 and the motor stator 23, and the front ventilation duct 26. In other embodiments, the cooling fan 25 may also be arranged between the front side of the motor rotor 24 and the motor stator 23 and the front ventilation duct 26, thereby intake of air from the third ventilation duct 30 into the motor cavity via the rear ventilation duct 27 through the fourth ventilation duct 40 or the gap between the motor rotor 24 and the motor stator 23, and then blown into the first ventilation duct 10 via the front ventilation duct 26.

[0052] like Figure 11 , Figure 12 As shown, in some specific embodiments, the front end face of the motor housing 22 has multiple front ventilation channels 26 along its outer periphery, and the rear end face of the motor housing 22 has multiple rear ventilation channels 27. Multiple fifth ventilation channels 50 are arranged along the circumferential direction of the motor output shaft 21, and multiple sixth ventilation channels 60 are also arranged along the circumferential direction of the motor output shaft 21, resulting in better ventilation. The front ventilation channels 26 are arranged along the outer periphery of the front end face of the motor housing 22, thus freeing up the middle area of ​​the front end face of the motor housing 22 for arranging the transmission device 3. The front end of the motor stator 23 is spaced apart from the inner wall of the front end of the motor housing 22 to form a fifth ventilation channel 50 communicating with each front ventilation channel 26. The rear end of the motor stator 23 is spaced apart from the inner wall of the rear end of the motor housing 22 to form a sixth ventilation channel 60 communicating with each rear ventilation channel 27. The front ends of the third ventilation channel 30 and the gap between the motor rotor 24 and the motor stator 23 are respectively connected to the fifth ventilation channel 50, and the rear ends are respectively connected to the sixth ventilation channel 60. This allows the cooling fan 25 to rotate with the motor output shaft 21, fanning the air inside the roller device 1 through the third ventilation duct 30, the rear ventilation duct 27, the sixth ventilation duct 60, the fourth ventilation duct 40, the fifth ventilation duct 50, and the front ventilation duct 26 to the first ventilation duct 10. This allows for heat exchange with the inside of the motor rotor 24, as well as the two ends of the motor rotor 24 and the two ends of the motor stator 23, resulting in better heat dissipation and cooling effects. It also prevents the motor stator 23 and the motor rotor 24 from blocking the front ventilation duct 26 and the rear ventilation duct 27, ensuring that the air can circulate within the electric roller.

[0053] like Figures 7-9As shown, in some specific embodiments, the motor rotor 24 includes a rotor body 241 coaxially fixed to the motor output shaft 21, and a plurality of magnet plates 242 attached to the outer peripheral sidewall of the rotor body 241. The outer peripheral sidewall of the rotor body 241 has a plurality of magnet slots 2411 arranged axially along its circumference, and a plurality of seventh ventilation channels 70 respectively arranged between adjacent magnet slots 2411. The magnet plates 242 are attached to the magnet slots 2411 and are used to generate a magnetic field with the motor stator 23 to drive the motor rotor 24 to rotate relative to the motor stator 23. The front end of the seventh ventilation duct 70 is connected to the front of the motor chamber, and the rear end of the seventh ventilation duct 70 is connected to the rear of the motor chamber. The air blown by the cooling fan 25 can flow through the sixth ventilation duct 60 at the rear of the motor chamber to the rear end of the seventh ventilation duct 70, and then flow along the first ventilation duct 10 to the fifth ventilation duct 50 at the front of the motor chamber. At the same time, it can dissipate heat and cool down the outer surface of the rotor body 241, the magnets 242 in the two adjacent magnet slots 2411, and the inner peripheral sidewall surface of the motor stator 23. In this embodiment, the fourth ventilation duct 40 is installed through the rotor body 241, so that the air blown by the cooling fan 25 can flow through the fourth ventilation duct 40 to dissipate heat and cool down the inside of the rotor body 241, and at the same time flow through the seventh ventilation duct 70 to dissipate heat and cool down the outside of the rotor body 241, the magnets 242, and the inner peripheral sidewall surface of the motor stator 23, thereby achieving better heat dissipation and cooling for the entire motor rotor 24 and the inner side of the motor stator 23.

[0054] like Figure 8 As shown, in some specific embodiments, a stirring bar 2412 is radially protruding from the seventh ventilation duct 70 along the rotor body 241, and the stirring bar 2412 is arranged axially along the rotor body 241. When the motor rotor 24 rotates, the stirring bar 2412 rotates coaxially with the motor rotor 24 to agitate the air in the seventh ventilation duct 70 and the air in the gap between the outer peripheral surface of the motor rotor 24 and the inner peripheral surface of the motor stator 23. This is more conducive to the uniform distribution of air between the outer peripheral surface of the motor rotor 24 and the inner peripheral surface of the motor stator 23, thereby uniformly dissipating heat and cooling the outer peripheral surface of the motor rotor 24 and the inner peripheral surface of the motor stator 23.

[0055] In some specific embodiments, the front and rear ends of the magnet slot 2411 are set as openings, and the distance between the two sides of the magnet slot 2411 arranged circumferentially along the rotor body 241 is set to gradually decrease from the end closer to the axis of the motor output shaft 21 to the end farther away from the axis of the motor output shaft 21. The two sides of the magnet sheet 242 arranged circumferentially along the rotor body 241 are matched with the two sides of the magnet slot 2411 arranged circumferentially along the rotor body 241. When attaching the magnet 242, the magnet 242 is inserted into the magnet slot 2411 from the opening along the axial direction of the rotor body 241. After the magnet 242 is attached, the two sides of the magnet 242 arranged circumferentially along the rotor body 241 are respectively limited within the two sides of the magnet slot 241 arranged circumferentially along the rotor body 241. This can serve to press the magnet 242 tightly. When the motor rotor 24 rotates at high speed, the two sides of the magnet slot 2411 arranged circumferentially along the rotor body 241 can prevent the magnet 242 from being thrown out, thus improving the stability of the magnet 242 attached within the magnet slot 2411.

[0056] In some specific embodiments, the two side walls of the seventh ventilation duct 70 arranged circumferentially along the rotor body 241 and the stirring bar 2412 are combined to form a rack structure with a W-shaped cross-section, which facilitates processing and production.

[0057] like Figure 9As shown, in some specific embodiments, the inner sidewall of the motor housing 22 is recessed with an eighth ventilation channel 80. The eighth ventilation channel 80 includes a plurality of ventilation slots 1 801 that penetrate the front end of the motor housing 22 and communicate with the front part of the motor chamber, a plurality of ventilation slots 2 802 that penetrate the rear end of the motor housing 22 and communicate with the rear part of the motor chamber, and at least one ventilation slot 3 803 that is arranged around the outer periphery of the motor stator and communicates with the ventilation slots 1 801 and 2 802 respectively. In this embodiment, after the motor stator 23 is interference-fitted into the motor housing 22, the air blown by the cooling fan 25 can flow from the sixth ventilation duct 60 at the rear of the motor chamber through the second ventilation slot 802, the third ventilation slot 803 and the first ventilation slot 801 to the fifth ventilation duct 50 at the front of the motor chamber. At the same time, it can dissipate heat and cool down the outer side of the motor stator 23 and the inner side of the motor housing 22. Since the third ventilation slot 803 is arranged around the outer periphery of the motor stator, it can increase the contact area between the air and the outer surface of the motor stator 23 and the inner surface of the motor housing 22 during the flow, which is conducive to achieving better heat dissipation and cooling effect. In this embodiment, six ventilation slots 801 and 802 are arranged along the circumference of the motor stator 23, and three ventilation slots 803 are arranged as annular slots along the axial direction of the motor stator 23. Adjacent ventilation slots 803 are connected by connecting slots 804 arranged along the axial direction of the motor stator 23. Each ventilation slot 801 is connected to the first ventilation slot 803 at the front end, and each ventilation slot 802 is connected to the last ventilation slot 803 at the rear end. The arrangement of multiple ventilation slots 801, 802, and 803 greatly increases the contact area between the air and the outer surface of the motor stator 23 and the inner surface of the motor housing 22, further improving the heat dissipation and cooling effect. The structure is simple and convenient for production and processing. In other embodiments, the ventilation slot 1 801, ventilation slot 2 802, or ventilation slot 3 803 may be configured in other quantities. The ventilation slot 3 803 may also be configured as a spiral slot or other shape arranged around the outer periphery of the motor stator 23, which can also increase the contact area between the wind and the outer surface of the motor stator 23 and the inner surface of the motor housing 22.

[0058] like Figure 10 As shown, in some specific embodiments, the cooling fan 25 includes a fan hub 251 circumferentially connected to the motor output shaft 21, and a plurality of fan blades 252 arranged circumferentially on the fan hub 251. The fan hub 251 is circumferentially connected to the motor output shaft 21 to prevent the cooling fan 25 from rotating relative to the motor output shaft 21, thereby ensuring that the cooling fan 25 can rotate with the motor output shaft 21.

[0059] In some specific embodiments, the fan hub 251 is provided with a hub channel, which has a first limiting plane 253 arranged along its axial direction. The motor output shaft 21 is provided with a first positioning plane corresponding to the first limiting plane 253. The hub channel is sleeved on the outside of the motor output shaft 21 and can be circumferentially limited by the first limiting plane 253 abutting against the first positioning plane. The structure is simple and robust. The hub channel and the motor output shaft 21 are in clearance fit to prevent damage to the motor output shaft 21 when the cooling fan 25 is installed on it. The distance between the outer peripheral side of the fan hub 251 and the hub channel gradually increases from the rear end to the front end, facilitating the guidance of airflow through the rear ventilation duct 27 into the motor cavity and then diffusing to the periphery of the motor housing 22, thereby achieving a larger area of ​​heat exchange and better heat dissipation and cooling effect inside the motor device 2. In other embodiments, multiple first limiting planes 253 may be provided.

[0060] like Figure 6 As shown, in some specific embodiments, the motor output shaft 21 is provided with a shoulder 211, and a limit ring 212 is snapped onto the motor output shaft 21. The fan hub 251 is axially limited between the shoulder 211 and the limit ring 212 to prevent the cooling fan 25 from moving axially relative to the motor output shaft 21.

[0061] like Figure 2 , Figure 4 As shown, in some specific embodiments, a first wire passage 28 is provided through the rear end of the motor housing 22, through which the motor lead wire 29 extends out of the motor housing 22. A second wire passage 51 is provided inside the rear support shaft 5, extending through the outer end of the rear support shaft 5. A wire hole 52 communicating with the second wire passage 51 is opened on the side wall of the rear support shaft 5. One end of the motor lead wire 29 is connected to the motor stator 23, and the other end passes through the first wire passage 28 and the wire hole 52, and is led out to the outside along the second wire passage 51. In this embodiment, the rear support shaft 5 is set as a hollow structure, and the second wire passage 51 is formed by the hollow interior of the rear support shaft 5. The structure is simple and easy to manufacture. Of course, in other embodiments, the second wire passage 51 may only be a part of the rear structure of the rear support shaft 5.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0063] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. An electric roller with internal circulation cooling, characterized in that: It includes a roller assembly with an enclosed roller chamber inside, and a motor assembly and a transmission assembly respectively arranged in the roller chamber. The transmission assembly is connected between the motor output shaft of the motor assembly and the roller assembly. The motor assembly and the transmission assembly are axially supported on an external support frame through a front support shaft and a rear support shaft. The front end of the roller assembly is rotatably connected to the front support shaft, and the rear end of the roller assembly is rotatably connected to the rear support shaft. The transmission device and the inner wall of the roller device are arranged with a gap to form a first ventilation channel. The motor device and the inner wall of the roller device are arranged with a gap to form a second ventilation channel that connects to the first ventilation channel. The motor device and the rear end wall of the roller device are arranged at intervals to form a third ventilation channel that connects to the second ventilation channel. The motor device includes a motor housing with an internal motor chamber, and a motor stator, a motor rotor, and a cooling fan arranged inside the motor chamber. The two ends of the motor output shaft are rotatably connected to the front and rear ends of the motor housing, respectively. The motor rotor and the cooling fan are fixed on the motor output shaft. The front end of the motor housing is provided with a front ventilation duct connecting the motor chamber and the first ventilation duct, and the rear end of the motor housing is provided with a rear ventilation duct connecting the motor chamber and the third ventilation duct. The cooling fan can rotate with the motor output shaft to fan the air in the closed roller chamber in sequence through the motor chamber, the front ventilation duct, the first ventilation duct, the second ventilation duct, the third ventilation duct, the rear ventilation duct, and the motor chamber, circulating within the closed roller chamber.

2. The electric roller according to claim 1, characterized in that: The inner wall of the roller device is respectively provided with a first return fan assembly arranged around the first ventilation duct and a second return fan assembly arranged around the third ventilation duct. The roller device can rotate around the first rotation direction under the drive of the motor output shaft and the transmission device. When the roller device rotates around the first rotation direction, it drives the first return fan assembly and the second return fan assembly to rotate and fan air. The air outlet direction of the first return fan assembly is arranged in the opposite direction to the air outlet direction of the cooling fan, and the air outlet direction of the second return fan assembly is arranged in the same direction as the air outlet direction of the cooling fan.

3. The electric roller according to claim 2, characterized in that: The roller device includes a roller structure, a front roller cover sealed to the front end of the roller structure, and a rear roller cover sealed to the rear end of the roller structure. The roller structure, the front roller cover, and the rear roller cover surround to form the closed roller chamber. The first return fan assembly is disposed on the inner wall of the roller structure and arranged between the front roller cover and the front end of the motor device. The second return fan assembly is disposed on the inner wall of the roller structure and arranged between the rear roller cover and the rear end of the motor device.

4. The electric roller according to claim 2, characterized in that: The first recirculation fan assembly includes a plurality of first recirculation fan blades that are respectively protruding along the first spiral path on the inner side wall of the roller device. The distance between the first end of the first spiral path and the rear end of the roller device is greater than the distance between the tail end of the first spiral path and the rear end of the roller device. The first spiral path is arranged from the first end of the first spiral path to the tail end of the first spiral path along a second rotation direction that is opposite to the first rotation direction. The second recirculation fan assembly includes multiple second recirculation fan blades that are respectively protruding along the second spiral path on the inner side wall of the roller device. The distance between the first end of the second spiral path and the rear end of the roller device is greater than the distance between the tail end and the rear end of the roller device, and the second spiral path is arranged from the first end of the second spiral path to the tail end of the second spiral path along the first rotation direction.

5. The electric roller according to any one of claims 1-4, characterized in that: A fourth ventilation duct is provided through the motor rotor. The front end of the fourth ventilation duct is connected to the front part of the motor chamber, and the rear end of the fourth ventilation duct is connected to the rear part of the motor chamber.

6. The electric roller according to claim 5, characterized in that: The motor rotor has multiple fourth ventilation channels extending from its rear end to its front end, and these channels are arranged along the circumference of the motor output shaft.

7. The electric roller according to any one of claims 1-4, characterized in that: The front end face of the motor housing has multiple front ventilation channels along its outer periphery. The front end of the motor stator and the inner wall of the front end of the motor housing are arranged at intervals to form a fifth ventilation channel communicating with each of the front ventilation channels; and / or, The rear end face of the motor housing is provided with a plurality of rear ventilation channels, and the rear end of the motor stator and the inner wall of the rear end of the motor housing are arranged at intervals to form a sixth ventilation channel that communicates with each of the rear ventilation channels.

8. The electric roller according to any one of claims 1-4, characterized in that: The motor rotor includes a rotor body coaxially fixed on the motor output shaft and multiple magnet plates attached to the outer peripheral sidewall of the rotor body. The outer peripheral sidewall of the rotor body has multiple magnet slots arranged along its axial direction in its circumferential direction and multiple seventh ventilation channels arranged between adjacent magnet slots. The magnet plates are attached to the magnet slots. The front end of the seventh ventilation channel is connected to the front part of the motor chamber, and the rear end of the seventh ventilation channel is connected to the rear part of the motor chamber.

9. The electric roller according to claim 8, characterized in that: The seventh ventilation duct is provided with a stirring bar protruding radially along the rotor body. The stirring bar is arranged axially along the rotor body. The cooling fan is arranged between the rear side of the motor rotor and the rear ventilation duct.

10. The electric roller according to any one of claims 1-4, characterized in that: The rear end of the motor housing is provided with a first wire passage through which the motor lead wire extends out of the motor housing. The rear support shaft is provided with a second wire passage through the outer end of the rear support shaft. The side wall of the rear support shaft is provided with a wire hole that connects to the second wire passage. The motor lead wire passes through the wire hole and is led out to the outside along the second wire passage.

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