Motor heat dissipation structure

Abstract

The utility model relates to the field of motors, in particular to a motor heat dissipation structure, which comprises an outer cylinder arranged at the rear end of a casing, an air inlet casing is arranged at the rear end of the outer cylinder, an inner cylinder is arranged in the outer cylinder, the outer cylinder and the inner cylinder are separated from each other, and a cooling channel for cooling airflow to pass through is formed between the outer cylinder and the inner cylinder. A supporting pipe for fixedly connecting the outer cylinder and the inner cylinder is arranged between the outer cylinder and the inner cylinder, air outlet holes communicated with the supporting pipe are formed in the outer cylinder and the inner cylinder, an air baffle is arranged on the front side of the inner cylinder, the air baffle and the air inlet shell are mutually spaced, an avoiding hole for a motor rotor to penetrate through is formed in the air baffle, and a fan impeller is installed on the motor rotor. The fan impeller is located at the front portion of the air inlet shell, a motor stator is installed in the machine shell, the motor stator and the machine shell are arranged in a spaced mode to form an air outlet channel for cooling airflow to pass through, the motor heat dissipation structure optimizes the circulation path of the cooling airflow, and the cooling effect on heating components in the motor is enhanced. The problem that the cooling airflow cannot enter the motor for cooling is solved.

Description

Technical Field

[0001] This utility model relates to the field of motors, specifically to a motor heat dissipation structure. Background Technology

[0002] Traditional electric motors consist of a housing, within which a motor rotor is rotatably mounted. A stator surrounds the rotor within the housing. An air intake housing with air inlets and a fan impeller are located at the rear of the housing. The motor rotor includes a rotor shaft, on which the fan impeller is mounted. During operation, the stator, rotor, and other core components generate significant heat due to electromagnetic losses and mechanical friction. If this heat cannot be dissipated effectively, it will cause excessive temperature rise, affecting the motor's operating efficiency, reliability, and lifespan.

[0003] The primary cooling system for electric motors relies on a fan impeller mounted on the rotor shaft. This impeller drives a cooling airflow into the motor for forced cooling. However, this airflow only cools the rear end windings (the end coils) and cannot penetrate deep into the motor's interior to create a circulating airflow, resulting in limited cooling effectiveness. In particular, the complex structure of the stator end windings makes heat dissipation difficult, easily leading to localized high-temperature zones that degrade motor performance and even cause insulation aging. Furthermore, the airflow path in traditional cooling structures is often uneven, resulting in uneven temperature distribution within the motor and further impacting cooling efficiency, requiring improvement. Utility Model Content

[0004] The purpose of this invention is to provide a motor heat dissipation structure that can optimize the heat dissipation path and increase the heat dissipation area to address the above problems.

[0005] To achieve the above objectives, this utility model discloses a motor heat dissipation structure, including an outer cylinder installed at the rear end of the housing, an air inlet shell installed at the rear end of the outer cylinder, an inner cylinder inside the outer cylinder, the outer cylinder and the inner cylinder being spaced apart from each other, forming a cooling channel for cooling airflow between the outer cylinder and the inner cylinder, a support pipe fixedly connecting the two between the outer cylinder and the inner cylinder, air outlet holes communicating with the support pipe on both the outer cylinder and the inner cylinder, a baffle plate on the front side of the inner cylinder, the baffle plate being spaced apart from the air inlet shell, a clearance hole for the motor rotor to pass through on the baffle plate, a fan impeller installed on the motor rotor, the fan impeller being located at the front of the air inlet shell.

[0006] By optimizing the cooling airflow path, the airflow can penetrate deep into the casing and cool the motor stator and other heat-generating components. Compared with the traditional blower cooling structure, the heat dissipation area is increased, resulting in better cooling on both sides of the motor stator. This reduces the overall operating cost and is suitable for cooling larger power motors.

[0007] The motor stator is installed in the casing, and the stator and casing are spaced apart to form an air outlet channel for cooling airflow. The motor rotor is inserted into the stator, and the two are spaced apart. The space between the rotor and stator forms a return air channel for cooling airflow. The front part of the stator is spaced apart from the casing, forming a return air bend connecting the air outlet channel and the return air channel. Airflow enters from the air inlet to the rear of the air inlet casing, then enters the cooling channel, then the air outlet channel, then the return air bend, then the return air channel, then the inner cylinder, then through the support pipe into the exhaust hood, and finally discharged outwards through the exhaust pipe.

[0008] The housing contains a motor bushing for supporting the motor stator. The motor bushing is fitted onto the motor stator and has a through hole for cooling airflow. The cooling airflow in the exhaust duct can pass through the through hole and enter the return air bend, thereby cooling the front end of the motor stator.

[0009] An exhaust hood is installed on the outer cylinder, and an exhaust pipe is mounted on the exhaust hood. The exhaust hood is fitted around the outer perimeter of the outer cylinder. The combination of the exhaust hood and the exhaust pipe concentrates and exhausts hot air, improving heat dissipation efficiency. The exhaust hood includes a surrounding cylinder, which is fitted around the outside of the outer cylinder, with the surrounding cylinder and the outer cylinder spaced apart. Side plates connecting to the outer cylinder are provided on the left and right sides of the surrounding cylinder. The surrounding cylinder and the outer cylinder form a cavity, where hot air from multiple support pipes converges and is finally exhausted to the outside through the exhaust pipe.

[0010] The outer cylinder has two positioning edges on its outer wall, spaced apart from each other. Two side plates correspond one-to-one with the two positioning edges, resting against the sides of the corresponding positioning edges. The positioning edges precisely position the side plates, and then bolts are used to fix the two together, ensuring consistent installation of the exhaust hood. Multiple support pipes are provided, spaced around the inner cylinder. Both the outer and inner cylinders have multiple air outlets, distributed circumferentially along the outer or inner cylinder. The air outlets on the outer cylinder correspond one-to-one with those on the inner cylinder, and the support pipes are installed between two corresponding air outlets. The support pipes serve both as structural components to reinforce the inner and outer cylinders and to ensure that the gas passes evenly around the motor stator head during exhaust, preventing uneven airflow distribution that could lead to inconsistent temperature differences around the stator head during air cooling. Multiple support pipes optimize airflow guidance and improve heat dissipation uniformity.

[0011] Bearings are mounted on the motor rotor, and support rings are installed in the clearance holes, with the bearings inserted into the support rings. Ordinary bearings or air bearings can be used. Air bearings have connecting rings, and the support rings and connecting rings are connected by screws. The air bearing is fitted onto the rotor shaft. During motor operation, the air bearing and rotor shaft do not contact each other; there is a very small gap between them, which acts as a seal, ensuring that all airflow is used for effective cooling.

[0012] Ribs are installed on the wind deflector. One end of each rib is connected to the inner wall of the inner cylinder, and the other end is connected to the outer wall of the support ring. Multiple ribs are provided, arranged at intervals around the support ring. This enhances the structural strength of the wind deflector, resists rotor vibration, balances stress, and prevents the support ring from deforming due to uneven load.

[0013] The air intake casing has an air inlet, and the fan impeller is located at the rear of the air inlet and in front of the clearance hole. The rotation of the fan impeller creates a negative pressure in the air intake casing, and the airflow enters the air intake casing through the air inlet.

[0014] The outer cylinder has bosses at both ends for connecting the motor. The bosses are ring-shaped and extend outwards. The rear end of the housing and the air inlet housing both have corresponding recesses that fit together. The end of the outer cylinder near the baffle plate is connected to the air inlet housing, and the other end of the outer cylinder is connected to the motor housing. This simplifies the overall assembly, ensures the coaxiality of the motor and the outer cylinder, and reduces installation errors.

[0015] In summary, the beneficial effects of this utility model are as follows: This motor heat dissipation structure overcomes the problem that the motor stator cannot effectively dissipate heat, especially in medium and high power motors, where the inability to remove large amounts of heat in time can easily lead to motor overheating, insulation aging, or even failure. Forced ventilation via a fan enhances airflow, significantly improving heat dissipation efficiency. The structure is simple, requiring no additional cooling medium or complex equipment, and maintenance is convenient, reducing downtime and repair costs. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the arrangement of the outer and inner cylinders;

[0018] Figure 3 This is a schematic diagram of the cooling channel structure;

[0019] Figure 4 This is a cross-sectional view of the support tube.

[0020] Figure 5 This is a schematic diagram of the mounting structure of the outer cylinder on the motor.

[0021] Figure 6 This is a schematic diagram of the application of this heat dissipation structure in a fan.

[0022] In the diagram: 1. Exhaust pipe; 2. Inner cylinder; 3. Outer cylinder; 4. Exhaust hood; 5. Support pipe; 6. Baffle plate; 7. Support ring; 8. Rib plate; 9. Air outlet; 10. Clearance hole; 11. Enclosure; 12. Side plate; 13. Positioning edge; 14. Boss; 15. Motor stator; 16. Motor rotor; 17. Inlet housing; 18. Fan impeller; 19. Housing; 20. Bearing; 21. Connecting ring; 22. Air inlet hole; 23. Air outlet channel; 24. Return air channel; 25. Return air bend; 26. Motor sleeve; 27. Recess. Detailed Implementation

[0023] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0024] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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 application 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 application.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0028] A motor cooling structure includes an outer cylinder 3 installed at the rear end of a housing 19, an air inlet shell 17 installed at the rear end of the outer cylinder 3, an inner cylinder 2 disposed within the outer cylinder 3, the outer cylinder 3 and the inner cylinder 2 being spaced apart, forming a cooling channel for cooling airflow. A support pipe 5 is provided between the outer cylinder 3 and the inner cylinder 2 to fix them together. Both the outer cylinder 3 and the inner cylinder 2 are provided with air outlet holes 9 communicating with the support pipe 5. A baffle plate 6 is provided on the front side of the inner cylinder 2, the baffle plate 6 being spaced apart from the air inlet shell 17, and a clearance hole 10 for the motor rotor 16 to pass through is provided on the baffle plate 6. A fan impeller 18 is mounted on the motor rotor 16, and the fan impeller 18 is located at the front of the air inlet shell 17. (See attached diagram) Figure 1 By optimizing the path of the cooling airflow, the airflow can penetrate deep into the interior of the housing 19, and the cooling airflow is used to cool the motor stator 15 and other heat-generating components. Compared with the traditional blower heat dissipation structure, the heat dissipation area is increased, so that both sides of the motor stator 15 have a better cooling effect, reducing the overall operating cost and making it suitable for heat dissipation of high-power motors.

[0029] See attached document Figure 1 A motor stator 15 is installed in the housing 19. The motor stator 15 and the housing 19 are spaced apart to form an air outlet channel 23 for cooling airflow. The motor rotor 16 is inserted into the motor stator 15 and spaced apart. The space between the motor rotor 16 and the motor stator 15 forms a return air channel 24 for cooling airflow. The front part of the motor stator 15 is spaced apart from the housing 19 to form a return air bend 25 connecting the air outlet channel 23 and the return air channel 24. The airflow enters from the air inlet 22 to the rear of the air inlet shell 17, then enters the cooling channel, then enters the air outlet channel 23, then enters the return air bend 25, then enters the return air channel 24, then enters the inner cylinder 2, then passes through the support pipe 5 into the exhaust hood 4, and finally is discharged outward from the exhaust pipe 1. The housing 19 is equipped with a motor sleeve 26 for supporting the motor stator 15. The motor sleeve 26 is fitted onto the motor stator 15. The motor sleeve 26 is provided with a through hole for cooling airflow to pass through. The cooling airflow in the air outlet 23 can pass through the through hole and enter the return air bend 25, thereby cooling the front end of the motor stator 15.

[0030] See attached document Figure 2 Appendix Figure 5An exhaust hood 4 is installed on the outer cylinder 3, and an exhaust pipe 1 is installed on the exhaust hood 4. The exhaust hood 4 is fitted onto the outer periphery of the outer cylinder 3. The exhaust hood 4 and the exhaust pipe 1 are combined to concentrate the exhaust of hot air, which can improve heat dissipation efficiency. The exhaust hood 4 includes a surrounding cylinder 11, which is fitted onto the outside of the outer cylinder 3. The surrounding cylinder 11 and the outer cylinder 3 are spaced apart from each other, and side plates 12 connecting the outer cylinder 3 are provided on the left and right sides of the surrounding cylinder 11. The surrounding cylinder 11 and the outer cylinder 3 form a cavity, in which hot air from multiple support pipes 5 converges and is finally discharged to the outside through the exhaust pipe 1.

[0031] See attached document Figure 2 Appendix Figure 5 The outer cylinder 3 has two positioning edges 13 on its outer wall, spaced apart from each other. Two side plates 12 correspond one-to-one with the two positioning edges 13, and the side plates 12 are attached to the sides of the corresponding positioning edges 13. The positioning edges 13 precisely position the side plates 12, and then bolts are used to fix the two together to ensure consistent installation of the exhaust hood 4. Multiple support pipes 5 are provided, which are arranged at intervals around the inner cylinder 2. Both the outer cylinder 3 and the inner cylinder 2 have multiple air outlets 9, which are distributed at intervals along the circumference of the outer cylinder 3 or the inner cylinder 2. The air outlets 9 on the outer cylinder 3 and the air outlets 9 on the inner cylinder 2 correspond one-to-one, and the support pipes 5 are installed between two corresponding air outlets 9. The support pipes 5 can not only serve as structural components to strengthen the inner cylinder 2 and the outer cylinder 3, but also allow the gas to pass evenly around the head of the motor stator 15 when it is discharged, avoiding the situation where the temperature difference around the head of the motor stator 15 is inconsistent due to uneven airflow distribution during air cooling. Multiple support tubes 5 can optimize airflow guidance and improve heat dissipation uniformity.

[0032] See attached document Figure 1 A bearing 20 is mounted on the motor rotor 16. A support ring 7 is installed on the clearance hole 10, and the bearing 20 is inserted into the support ring 7. The bearing 20 can be a standard bearing 20 or an air bearing 20. The air bearing 20 has a connecting ring 21, and the support ring 7 is connected to the connecting ring 21 by screws. The air bearing 20 is fitted onto the rotor shaft. During motor operation, the air bearing 20 does not contact the rotor shaft; there is a very small gap between them, which acts as a seal, ensuring that all airflow is used for effective cooling. (See attached diagram.) Figure 3 Appendix Figure 4 Ribs 8 are installed on the wind baffle 6. One end of the rib 8 is connected to the inner wall of the inner cylinder 2, and the other end is connected to the outer wall of the support ring 7. Multiple ribs 8 are provided, spaced apart around the support ring 7. This enhances the structural strength of the wind baffle 6, resists rotor vibration, balances force distribution, and prevents eccentric deformation of the support ring 7. (See attached diagram.) Figure 1 The air intake housing 17 is provided with an air intake hole 22, and the fan impeller 18 is located in front of the rear clearance hole 10 of the air intake hole 22. The rotation of the fan impeller 18 creates a negative pressure in the air intake housing 17, and the airflow enters the air intake housing 17 through the air intake hole 22.

[0033] See attached document Figure 5 The outer cylinder 3 has protrusions 14 at both ends for connecting the motor. The protrusions 14 are annular and extend outward. The rear end of the housing 19 and the air inlet housing 17 are both provided with recesses 27 corresponding to the protrusions 14. The protrusions 14 and the recesses 27 are in a convex-concave fit. One end of the outer cylinder 3 near the baffle plate 6 is connected to the air inlet housing 17, and the other end of the outer cylinder 3 is connected to the motor housing 19. This simplifies the overall assembly, ensures the coaxiality of the motor and the outer cylinder, and reduces installation errors.

[0034] See attached document Figure 1 When the motor is powered on, the main source of heat comes from the two ends of the stator 15. Cooling gas enters the housing 19 through the cooling channel, and some of the heat from the stator 15 is directly carried away by the cooling air. In addition to cooling the motor, this component can also cool the air suspension fan. When the air suspension fan is working, the high-speed operation of the motor rotor 16 assembly generates a buoyancy force, which keeps the rotor assembly in a suspended state. Operation is contactless and frictionless. At this time, a non-contact annular airflow channel is formed between the motor stator 15 and the motor rotor 16 assembly. The cooling channel is aligned with the outer periphery of the motor stator 15. The cooling airflow first cools the motor stator 15, and then, after reaching the other end of the housing 19, enters the annular airflow channel to cool the motor rotor 16 assembly. While carrying away the heat generated by the blower, the entering cooling gas has become hot. At this time, the heated airflow is in the inner cylinder 2, passes through the support pipe 5 into the exhaust hood 4, and is discharged outward through the exhaust pipe 1.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An electric motor heat dissipation structure, characterized by comprising: The outer cylinder (3) is installed at the rear end of the housing (19). An air inlet shell (17) is installed at the rear end of the outer cylinder (3). An inner cylinder (2) is provided in the outer cylinder (3). The outer cylinder (3) and the inner cylinder (2) are spaced apart from each other. A cooling channel for cooling airflow is formed between the outer cylinder (3) and the inner cylinder (2). A support pipe (5) is provided between the outer cylinder (3) and the inner cylinder (2) to fix the two together. An air outlet (9) communicating with the support pipe (5) is provided on both the outer cylinder (3) and the inner cylinder (2). A baffle plate (6) is provided on the front side of the inner cylinder (2). The baffle plate (6) is spaced apart from the air inlet shell (17). An avoidance hole (10) is opened on the baffle plate (6) for the motor rotor (16) to pass through. A fan impeller (18) is installed on the motor rotor (16). The fan impeller (18) is located in front of the air inlet shell (17).

2. The motor heat dissipating structure according to claim 1, wherein The motor stator (15) is installed in the housing (19). The motor stator (15) and the housing (19) are spaced apart to form an air outlet channel (23) through which cooling airflow passes. The motor rotor (16) is inserted in the motor stator (15) and the two are spaced apart. The space between the motor rotor (16) and the motor stator (15) forms a return air channel (24) through which cooling airflow passes. The front part of the motor stator (15) is spaced apart from the housing (19) to form a return air bend (25) connecting the air outlet channel (23) and the return air channel (24).

3. The motor heat dissipating structure according to claim 2, wherein The housing (19) is equipped with a motor sleeve (26) for supporting the motor stator (15). The motor sleeve (26) is fitted onto the motor stator (15) and has a through hole for cooling airflow.

4. The motor heat dissipating structure according to claim 1, wherein An exhaust hood (4) is installed on the outer cylinder (3), and an exhaust pipe (1) is installed on the exhaust hood (4). The exhaust hood (4) is fitted onto the outer periphery of the outer cylinder (3).

5. The motor heat dissipating structure according to claim 4, wherein The exhaust hood (4) includes a surrounding tube (11), which is fitted on the outside of the outer tube (3). The surrounding tube (11) and the outer tube (3) are spaced apart from each other. Side plates (12) connecting the outer tube (3) are provided on the left and right sides of the surrounding tube (11).

6. The motor heat dissipating structure according to claim 5, wherein The outer wall of the outer cylinder (3) is provided with two positioning edges (13), the two positioning edges (13) are spaced apart from each other, and the two side plates (12) correspond one-to-one with the two positioning edges (13), and the side plates (12) are attached to the side of the corresponding positioning edge (13).

7. The motor heat dissipating structure according to claim 1, wherein The support tube (5) is provided in multiple ways. Multiple support tubes (5) are arranged at intervals around the inner cylinder (2). Both the outer cylinder (3) and the inner cylinder (2) are provided with multiple air outlets (9). The air outlets (9) are distributed at intervals along the circumference of the outer cylinder (3) or the inner cylinder (2). The air outlets (9) on the outer cylinder (3) and the air outlets (9) on the inner cylinder (2) correspond one-to-one. The support tube (5) is installed between two corresponding air outlets (9).

8. The motor heat dissipating structure according to claim 1, wherein The motor rotor (16) is fitted with a bearing (20), and a support ring (7) is installed on the clearance hole (10). The bearing (20) is inserted into the support ring (7).

9. The motor heat dissipating structure according to claim 7, wherein The wind deflector (6) is equipped with a rib (8), one end of which is connected to the inner wall of the inner cylinder (2), and the other end of which is connected to the outer wall of the support ring (7). There are multiple ribs (8), and multiple ribs (8) are arranged at intervals around the support ring (7).

10. The motor heat dissipation structure as described in claim 1, characterized in that, The air intake shell (17) is provided with an air intake hole (22), and the fan impeller (18) is located in front of the rear clearance hole (10) of the air intake hole (22).

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