Fan structure with efficient heat dissipation function

Through the design of external rotor brushless motor and heat dissipation blades, the fan's heat dissipation problem under high load conditions is solved, and efficient heat dissipation and stability are achieved.

CN223305978UActive Publication Date: 2025-09-05ZHONGSHAN GUANGRUI ELECTRIC CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202422203347.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-09
Publication Date
2025-09-05
Estimated Expiration
2034-09-09

AI Technical Summary

Technical Problem

Existing fans have low efficiency under high load or high demand conditions, insufficient power output, and high temperature rise under long-term operation, which affects stability and reliability.

Method used

The external rotor DC brushless motor design is adopted to guide the heat generated by the central drive shaft into the outside of the rotor, and the heat is quickly exported through the rotor rotation. Combined with the heat dissipation blades and the rotation of the stator, the airflow is driven to discharge heat, improving the heat dissipation effect.

Benefits of technology

Improves the heat dissipation effect of the fan, avoids heat attenuation, and improves efficiency and stability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223305978U_ABST
    Figure CN223305978U_ABST
Patent Text Reader

Abstract

The fan structure comprises a bottom air inlet cover and a top air inlet cover and further comprises an outer rotor brushless direct current motor, the top air inlet cover is arranged at the upper end of the bottom air inlet cover, an annular air inlet is formed in the bottom face of the bottom air inlet cover, and the outer rotor brushless direct current motor is arranged at the lower end of the top air inlet cover. And an outer rotor direct current brushless motor is arranged at the upper end of the top air inlet cover. According to the fan structure with the efficient heat dissipation function, the outer rotor direct-current brushless motor is arranged, heat generated by the center transmission shaft can be guided into the outer side of the rotor, heat generated by the stator can be reduced, meanwhile, the rotor rotates on the outer side of the stator, the heat can be rapidly guided out, and the heat dissipation efficiency is improved. In this way, the heat dissipation effect of the fan can be improved, heat attenuation generated by the stator and the rotor can be avoided, and therefore the efficiency and stability of the device are improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of fan heat dissipation, in particular to a fan structure with high-efficiency heat dissipation. Background Art

[0002] Fans increase gas pressure and velocity through rotating blades and are primarily used in systems that boost air pressure, such as automotive turbochargers or industrial gas delivery systems. When selecting a fan, consider the application requirements, fan type (e.g., centrifugal or axial), flow and pressure requirements, efficiency and power consumption, noise and vibration, and pay attention to maintenance and lifespan. Proper fan installation and commissioning, ensuring efficient operation within the system, and regular maintenance can extend fan life and optimize performance.

[0003] Existing fans also present the following technical issues: Shaded-pole fans have disadvantages including low efficiency and power output, limited starting torque, and insufficient performance under high load or demand conditions. Furthermore, the shaded-pole motor design can cause the fan to heat up significantly over extended periods of operation, impacting its long-term stability and reliability. Therefore, a fan structure with efficient heat dissipation is needed to provide a new technical solution to address the technical issues mentioned in the aforementioned patent. Utility Model Content

[0004] Based on this, it is necessary to provide a fan structure with efficient heat dissipation to address the above technical problems. By setting an outer rotor DC brushless motor, the heat generated by the central drive shaft can be introduced to the outside of the rotor, so that the stator can reduce the heat generated by itself. At the same time, the rotor rotates on the outside of the stator to quickly conduct heat away, which can improve the heat dissipation effect of the fan itself, and thus avoid the thermal attenuation generated by the stator and rotor, thereby improving the efficiency and stability of the device.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A fan structure with high-efficiency heat dissipation is used for improving the heat dissipation and efficiency of the fan.

[0007] The fan structure with efficient heat dissipation specifically includes a bottom air inlet cover and a top air inlet cover, and also includes an outer rotor DC brushless motor, the top air inlet cover is provided at the upper end of the bottom air inlet cover, the bottom surface of the bottom air inlet cover is provided with an annular air inlet, and the upper end of the top air inlet cover is provided with an outer rotor DC brushless motor;

[0008] The outer rotor DC brushless motor includes an annular support frame, a central positioning sleeve, a stator, a central transmission shaft, a bearing, a rotor and an impeller, the top surface of the top air inlet cover is fixedly connected to the annular support frame, the middle part of the annular support frame is fixedly connected to the central positioning sleeve, the surface of the central positioning sleeve is fixedly connected to the stator, the middle part of the central positioning sleeve is provided with a central transmission shaft, the surface of the central transmission shaft is fixedly connected to two bearings, the two bearings are fixedly connected to the inner wall of the central positioning sleeve, the central transmission shaft is rotatably connected to the middle part of the central positioning sleeve through the bearings, the top end of the central transmission shaft is provided with a rotor, the rotor is covered on the surface of the stator and a certain distance is maintained between the rotor and the middle part of the stator, the end of the central transmission shaft away from the rotor extends to the middle part of the bottom air inlet cover and the top air inlet cover, the central transmission shaft is rotatably connected to the middle part of the top air inlet cover, the end of the central transmission shaft away from the rotor is fixedly connected to the impeller, and the impeller is provided in the middle part of the bottom air inlet cover and the top air inlet cover.

[0009] As a preferred embodiment of the fan structure with efficient heat dissipation provided by the utility model, a top protective cover is provided at the upper end of the rotor, the top protective cover is fixedly connected to the top surface of the annular support frame, and the top surface of the top protective cover is provided with heat dissipation holes.

[0010] As a preferred embodiment of the fan structure with efficient heat dissipation provided by the utility model, a certain distance is left between the annular support frame and the middle of the top air inlet cover, and the surface of the central transmission shaft is fixedly connected with heat dissipation blades, and the heat dissipation blades are arranged in the middle of the top air inlet cover and the annular support frame.

[0011] As a preferred embodiment of the fan structure with efficient heat dissipation provided by the present invention, the top air inlet cover is fixedly connected to the annular support frame by positioning bolts, and a shock-absorbing rubber pad is provided at the connection between the positioning bolts and the annular support frame.

[0012] As a preferred embodiment of the fan structure with high-efficiency heat dissipation provided by the present invention, the surface of the middle positioning sleeve is located below the stator and is fixedly connected to a circuit board.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model provides a fan structure with efficient heat dissipation. By providing an outer rotor DC brushless motor, the heat generated by the central drive shaft can be introduced to the outside of the rotor, thereby reducing the heat generated by the stator itself. At the same time, the rotor rotates on the outside of the stator to quickly conduct heat away, thereby improving the heat dissipation effect of the fan itself, thereby avoiding thermal attenuation generated by the stator and rotor, and thus improving the efficiency and stability of the device.

[0015] The utility model provides a fan structure with efficient heat dissipation. By arranging heat dissipation blades to cooperate with the rotation of the stator, the rotation of the stator can drive the heat dissipation blades to rotate synchronously. Then, the external airflow can be guided into the middle part of the top protective cover through the rotation of the heat dissipation blades and then discharged from the heat dissipation holes, thereby further improving the heat dissipation effect of the outer rotor DC brushless motor itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the solutions in the present invention, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of the fan structure with high efficiency heat dissipation provided by the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the outer rotor DC brushless motor with a fan structure and high-efficiency heat dissipation provided by the utility model;

[0019] Figure 3 This is a schematic diagram of the exploded structure of the outer rotor DC brushless motor with a fan structure and high-efficiency heat dissipation provided by the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the fan structure with high-efficiency heat dissipation provided by the utility model, including a shock-absorbing rubber pad, a positioning bolt, and an annular support frame;

[0021] Figure 5 This is a schematic diagram of the internal structure of the bottom air inlet cover and the top air inlet cover of the fan structure with efficient heat dissipation provided by the utility model.

[0022] The markings in the figure are as follows:

[0023] 1. Bottom air inlet cover; 2. Top air inlet cover; 3. Annular air inlet; 4. Outer rotor DC brushless motor; 5. Annular support frame; 6. Middle positioning sleeve; 7. Stator; 8. Center drive shaft; 9. Bearing; 10. Rotor; 11. Impeller; 12. Top protective cover; 13. Heat dissipation holes; 14. Heat dissipation blades; 15. Shock-absorbing rubber pads; 16. Positioning bolts; 17. Circuit board. DETAILED DESCRIPTION

[0024] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0025] As mentioned in the background, shaded-pole fans have drawbacks including low efficiency and power output, limited starting torque, and insufficient performance under high load or demand conditions. Furthermore, the shaded-pole motor design can cause the fan to heat up significantly over extended periods of operation, impacting its long-term stability and reliability.

[0026] In order to solve this technical problem, the utility model provides a fan structure with high-efficiency heat dissipation, which is applied to the heat dissipation and efficiency improvement of the fan.

[0027] Specifically, please refer to Figure 1-Figure 2 The fan structure with efficient heat dissipation specifically includes a bottom air inlet cover 1 and a top air inlet cover 2, and also includes an outer rotor DC brushless motor 4. The upper end of the bottom air inlet cover 1 is provided with a top air inlet cover 2, and the bottom surface of the bottom air inlet cover 1 is provided with an annular air inlet 3, and the upper end of the top air inlet cover 2 is provided with an outer rotor DC brushless motor 4.

[0028] The utility model provides a fan structure with efficient heat dissipation. By providing an outer rotor DC brushless motor 4, the heat generated by the central transmission shaft 8 can be introduced to the outside of the rotor 10, so that the heat generated by the stator 7 can be reduced. At the same time, the rotor 10 rotates outside the stator 7 to quickly conduct heat, thereby improving the heat dissipation effect of the fan itself, thereby avoiding thermal attenuation generated by the stator 7 and the rotor 10, thereby improving the efficiency and stability of the device.

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] Example 1:

[0031] Please refer to Figure 2-Figure 5A fan structure with efficient heat dissipation, the outer rotor DC brushless motor 4 includes an annular support frame 5, a central positioning sleeve 6, a stator 7, a central transmission shaft 8, a bearing 9, a rotor 10 and an impeller 11. The top surface of the top air inlet cover 2 is fixedly connected to the annular support frame 5, the middle of the annular support frame 5 is fixedly connected to the central positioning sleeve 6, the surface of the central positioning sleeve 6 is fixedly connected to the stator 7, the middle of the central positioning sleeve 6 is provided with a central transmission shaft 8, the surface of the central transmission shaft 8 is fixedly connected to two bearings 9, and the two bearings 9 are fixedly connected to the central positioning sleeve 6. The inner wall of the central transmission shaft 8 is rotatably connected to the middle of the central positioning sleeve 6 through a bearing 9. A rotor 10 is provided at the top of the central transmission shaft 8. The rotor 10 is covered on the surface of the stator 7 and the rotor 10 maintains a certain distance from the middle of the stator 7. The end of the central transmission shaft 8 away from the rotor 10 extends to the middle of the bottom air inlet cover 1 and the top air inlet cover 2. The central transmission shaft 8 is rotatably connected to the middle of the top air inlet cover 2. The end of the central transmission shaft 8 away from the rotor 10 is fixedly connected to the impeller 11, and the impeller 11 is provided in the middle of the bottom air inlet cover 1 and the top air inlet cover 2.

[0032] Specifically, a top protective cover 12 is provided at the upper end of the rotor 10 . The top protective cover 12 is fixedly connected to the top surface of the annular support frame 5 . A heat dissipation hole 13 is opened on the top surface of the top protective cover 12 .

[0033] Specifically, a circuit board 17 is fixedly connected to the surface of the middle positioning sleeve 6 below the stator 7 .

[0034] Through the above-mentioned structural design, power is supplied to the circuit board 17 so that it supplies power to the stator 7. After the stator 7 is powered, an electromagnetic field is formed on its outer ring, so that the rotor 10 can rotate around the outer ring of the stator 7. When the rotor 10 rotates, it drives the central transmission shaft 8 to rotate in the middle of the central positioning sleeve 6 through the bearing 9. When the central transmission shaft 8 rotates, it can drive the impeller 11 at the bottom end to rotate in the middle of the bottom air inlet hood 1 and the top air inlet hood 2, so that the external airflow can be introduced into the bottom air inlet hood 1 and the top air inlet hood 2 through the annular air inlet 3 and blown out through the outlet at the front end of the bottom air inlet hood 1 and the top air inlet hood 2.

[0035] Example 2:

[0036] The fan structure with high efficiency heat dissipation provided in Example 1 is further optimized. Specifically, Figure 3-Figure 4 As shown, there is a certain distance between the annular support frame 5 and the middle of the top air inlet cover 2, and the surface of the central transmission shaft 8 is fixedly connected with the heat dissipation blade 14, which is arranged in the middle of the top air inlet cover 2 and the annular support frame 5. The reserved distance can ensure the installation space of the heat dissipation blade 14, and at the same time, the air inlet space at the bottom of the annular support frame 5 can be ensured.

[0037] Specifically, the top air inlet cover 2 is fixedly connected to the annular support frame 5 by means of positioning bolts 16 , and a shock-absorbing rubber pad 15 is provided at the connection between the positioning bolts 16 and the annular support frame 5 .

[0038] Through the above structural design, the central transmission shaft 8 rotates while driving the heat dissipation blades 14 to rotate. The heat dissipation blades 14 introduce external air into the interior of the top protective cover 12. After the airflow enters the interior of the top protective cover 12, it flows out from the heat dissipation holes 13, thereby achieving auxiliary heat dissipation of the internal stator 7 and rotor 10.

Claims

1. A fan structure with high-efficiency heat dissipation, comprising a bottom air inlet cover (1) and a top air inlet cover (2), characterized in that; It also includes an outer rotor DC brushless motor (4), a top air inlet cover (2) is provided at the upper end of the bottom air inlet cover (1), an annular air inlet (3) is provided on the bottom surface of the bottom air inlet cover (1), and an outer rotor DC brushless motor (4) is provided at the upper end of the top air inlet cover (2); The outer rotor DC brushless motor (4) comprises an annular support frame (5), a central positioning sleeve (6), a stator (7), a central transmission shaft (8), a bearing (9), a rotor (10) and an impeller (11); the top surface of the top air inlet cover (2) is fixedly connected to the annular support frame (5); the middle of the annular support frame (5) is fixedly connected to the central positioning sleeve (6); the surface of the central positioning sleeve (6) is fixedly connected to the stator (7); the middle of the central positioning sleeve (6) is provided with a central transmission shaft (8); the surface of the central transmission shaft (8) is fixedly connected to two bearings (9); the two bearings (9) are fixedly connected to the inner wall of the central positioning sleeve (6); the central The transmission shaft (8) is rotatably connected to the middle of the middle positioning sleeve (6) through a bearing (9); a rotor (10) is provided at the top end of the central transmission shaft (8); the rotor (10) is covered on the surface of the stator (7) and a certain distance is maintained between the rotor (10) and the middle of the stator (7); the end of the central transmission shaft (8) away from the rotor (10) extends to the middle of the bottom air inlet cover (1) and the top air inlet cover (2); the central transmission shaft (8) is rotatably connected to the middle of the top air inlet cover (2); the end of the central transmission shaft (8) away from the rotor (10) is fixedly connected to an impeller (11), and the impeller (11) is provided at the middle of the bottom air inlet cover (1) and the top air inlet cover (2).

2. The fan structure with high efficiency heat dissipation according to claim 1, characterized in that: A top protective cover (12) is provided at the upper end of the rotor (10), the top protective cover (12) is fixedly connected to the top surface of the annular support frame (5), and a heat dissipation hole (13) is provided on the top surface of the top protective cover (12).

3. The fan structure with high efficiency heat dissipation according to claim 2, characterized in that: A certain distance is left between the annular support frame (5) and the middle of the top air inlet cover (2); a heat dissipation blade (14) is fixedly connected to the surface of the central transmission shaft (8); and the heat dissipation blade (14) is arranged in the middle of the top air inlet cover (2) and the annular support frame (5).

4. The fan structure with high heat dissipation efficiency according to claim 1, characterized in that: The top air inlet cover (2) and the annular support frame (5) are fixedly connected via positioning bolts (16), and a shock-absorbing rubber pad (15) is provided at the connection between the positioning bolts (16) and the annular support frame (5).

5. The fan structure with high efficiency heat dissipation according to claim 1, characterized in that: The surface of the middle positioning sleeve (6) is located below the stator (7) and is fixedly connected to a circuit board (17).