Low-power self-heat-dissipation fan

Abstract

The utility model relates to fan technical field, concretely relates to a low -power self -cooling fan, it includes the shell, its inside is equipped with the accommodation cavity, and is set up with first heat dissipation mouth, second heat dissipation mouth, air inlet channel and air outlet channel, the pivot is rotatably connected in the shell, the rotor is fixedly established in the outer peripheral side of pivot, the stator is fixedly established in the accommodation cavity of shell, the first impeller is fixedly established in the one end of pivot close to first heat dissipation mouth, the second impeller is fixedly established in the other end of pivot, is located the intercommunication of air inlet channel and air outlet channel, is used for compressing airflow, and the present application has reduced the thermal resistance greatly, has promoted the heat dissipation efficiency, has effectively controlled motor temperature rise, this not only has avoided the problem that the motor because temperature rise is excessively high accelerates internal component ageing, reduces the service life, still provides strong support for promoting fan power density and performance.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a low-power self-cooling fan. Background Technology

[0002] Traditional small-power fans have long suffered from poor heat dissipation efficiency. Currently, most of these fans still use basic and inefficient cooling methods, mainly relying on natural heat dissipation from the outer casing or only cooling the fan casing itself. Under this cooling mechanism, the heat generated by the stator and rotor inside the motor must undergo a conduction process with high thermal resistance: the heat must first be conducted from the heat-generating core through the internal materials to the outer casing before it can be dissipated into the surrounding air. Due to numerous obstacles in this conduction path, the heat cannot be dissipated quickly and efficiently, resulting in a significant overall temperature rise in the motor. Excessive motor temperature rise brings a series of negative effects, not only accelerating the aging of internal components and reducing their service life. Utility Model Content

[0003] The purpose of this invention is to provide a low-power self-cooling fan to solve the problems in the existing technology. The technical solution of this utility model is: a low-power self-cooling fan, comprising: The outer shell has an internal cavity and is provided with a first heat dissipation port, a second heat dissipation port, an air inlet channel and an air outlet channel. The first heat dissipation port and the second heat dissipation port are respectively connected to the cavity. A rotating shaft is rotatably connected to the outer casing in a first direction; The rotor is coaxially fixed to the outer periphery of the rotating shaft; The stator is fixed in the receiving cavity of the housing and works in conjunction with the rotor through electromagnetic induction to drive the shaft to rotate; The first impeller is fixed to one end of the rotating shaft near the first heat dissipation port. It is used to pressurize the airflow flowing into the first heat dissipation port and then flow into the receiving cavity to carry away the heat generated by the stator and rotor, and then discharge it through the second heat dissipation port. The second impeller is fixed at the other end of the rotating shaft and located at the connection between the air inlet channel and the air outlet channel, and is used to compress the airflow.

[0004] Preferably, the outer casing includes a heat dissipation shell, a main shell, and a volute connected sequentially along the first direction. The first heat dissipation port is located on the heat dissipation shell, the second heat dissipation port is located near the middle of the main shell, the air inlet channel and the air outlet channel are located on the volute, and the receiving cavity is located inside the main shell.

[0005] Preferably, a first limiting member is fixedly provided inside the main housing on the side near the heat dissipation housing. The first limiting member is an annular structure, and its outer periphery is connected to the inner wall of the main housing. The first limiting member is provided with a plurality of guide holes for connecting the first heat dissipation port and the receiving cavity.

[0006] Preferably, the heat dissipation housing is provided with a transition chamber, the transition chamber is connected to the first heat dissipation port and the guide hole, the first impeller is located in the transition chamber and is directly opposite the entrance of the guide hole.

[0007] Preferably, a first air bearing is fixedly provided on the inner side of the first limiting member, the rotating shaft passes through the first air bearing and rotates with it to form an air film, and the airflow from the first heat dissipation port flows sequentially through the transition chamber, the gap between the first air bearing and the rotating shaft and then enters the receiving cavity.

[0008] Preferably, a second limiting member is fixedly provided inside the main housing on the side near the volute, and a second air bearing is fixedly provided on the inner side of the second limiting member. The second air bearing is coaxially arranged with the first air bearing, and the rotating shaft passes through the second air bearing and rotates with it to form an air film.

[0009] Preferably, a thrust chamber is formed between the second limiting member and the second air bearing, and a thrust plate is fixed on the outer periphery of the rotating shaft. The thrust plate has an annular structure and is located in the thrust chamber to restrict the axial movement of the rotating shaft.

[0010] Preferably, a portion of the airflow from the air intake channel can enter the thrust chamber, and after flowing through the gap between the second air bearing and the rotating shaft to form an air film, it enters the receiving cavity.

[0011] Compared with the prior art, the advantages of this utility model are: The first impeller actively draws airflow from the first heat dissipation port into the receiving cavity, directly carrying away the heat generated by the stator and rotor and expelling it from the second heat dissipation port. This breaks the inefficient mode of traditional fans that rely on heat conduction from the heat-generating core through materials to the outer casing for heat dissipation, significantly reducing thermal resistance, improving heat dissipation efficiency, and effectively controlling motor temperature rise. This not only avoids the problem of motors aging internal components and reducing service life due to excessive temperature rise, but also provides strong support for improving the power density and performance of the fan. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural schematic diagram of a low-power self-cooling fan according to the present invention; Figure 2This is a cross-sectional view of a low-power self-cooling fan according to the present invention. Figure 3 This is a longitudinal sectional view of a low-power self-cooling fan according to the present invention.

[0013] Explanation of reference numerals in the attached figures: 1. Outer shell; 11. Receiving cavity; 12. First heat dissipation vent; 13. Second heat dissipation vent; 14. Heat dissipation shell; 15. Main shell; 16. Volute; 17. Transition chamber; 18. Air inlet channel; 19. Air outlet channel; 21. Rotating shaft; 22. Stator; 23. Rotor; 31. First limiting member; 32. Second limiting member; 33. Thrust chamber; 34. Thrust plate; 35. Guide hole; 41. First air bearing; 42. Second air bearing; 51. First impeller; 52. Second impeller. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "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 utility model 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 utility model.

[0017] like Figures 1 to 3As shown, a low-power self-cooling fan includes a housing 1, a rotating shaft 21, a stator 22, and a rotor 23. The housing 1 has a receiving cavity 11, and the stator 22 is fixed to the inner wall of the receiving cavity 11. The rotating shaft 21 is rotatably connected to the housing 1 in a first direction, and the rotor 23 is coaxially fixed to the outer periphery of the rotating shaft 21. The rotating shaft 21 is driven to rotate by the electromagnetic induction between the stator 22 and the rotor 23. A first impeller 51 is fixed at one end of the rotating shaft 21, and a second impeller 52 is fixed at the other end. A first heat dissipation port 12 is provided near the first impeller 51 in the housing 1, and a second heat dissipation port 13 communicating with the receiving cavity 11 is provided near the middle position of the housing 1. Airflow enters from the first heat dissipation port 12 and is pressurized by the first impeller 51 before entering the receiving cavity 11, carrying away the heat in the receiving cavity 11 through the second heat dissipation port 13. Unlike traditional methods that rely solely on natural heat dissipation from the surface of the housing 1 or only cool the housing 1, the cooling airflow passes through the inside of the motor, directly carrying away the heat generated by the stator 22 and the rotor 23, thus improving cooling efficiency.

[0018] The outer casing 1 includes a heat dissipation casing 14, a main casing 15, and a volute 16 connected in sequence, with a receiving cavity 11 disposed within the main casing 15. A first limiting member 31 is fixedly provided on the main casing 15 near the first impeller 51, that is, the outer periphery of the first limiting member 31 is fixed to the inner wall of the main casing 15. The first limiting member 31 has a hollow annular structure. The first limiting member 31 has several guide holes 35 for connecting the main casing 15 and the heat dissipation casing 14, that is, the guide holes 35 connect the receiving cavity 11 and the first heat dissipation port 12.

[0019] Preferably, the heat dissipation housing 14 is provided with a transition chamber 17, which connects the first heat dissipation port 12 and the guide hole 35. The first impeller 51 is rotatably connected to the connection between the transition chamber 17 and the guide hole 35. When the first impeller 51 rotates, a negative pressure is generated in the transition chamber 17. External cold air is forcefully drawn into the transition chamber 17 from the first heat dissipation port 12. Subsequently, under the pressure of the impeller, the airflow passes through the guide hole 35 at high speed, forming a jet that blows directly onto the motor stator 22 and rotor 23 in the receiving cavity 11, and finally carries the heat out from the second heat dissipation port 13 in the middle of the main housing 15.

[0020] A first air bearing 41 is fixedly mounted on the inner side of the first limiting member 31. The rotating shaft 21 is rotatably connected to the first air bearing 41. The airflow from the first heat dissipation port 12 forms an air film after passing through the gap between the first air bearing 41 and the rotating shaft 21, and then enters the receiving cavity 11, causing the rotating shaft 21 to suspend and rotate. At the same time, the airflow entering the receiving cavity 11 through the first air bearing 41 can also dissipate heat from the stator 22 and the rotor 23. The airflow that forms a jet through the guide hole 35 and blows directly onto the motor stator 22 and the rotor 23, along with the airflow entering the receiving cavity 11 at the first air bearing 41, works in tandem with the first air bearing 41. The two channels work together to ensure that a sufficient amount of cold air participates in heat exchange, improving heat dissipation efficiency and removing the heat generated by the motor more quickly and effectively.

[0021] A second limiting member 32 is fixedly provided on the side of the main housing 15 near the second impeller 52. A second air bearing 42 is fixedly provided on the inner side of the second limiting member 32. The second air bearing 42 and the first air bearing 41 are coaxially arranged along the first direction. The rotating shaft 21 is rotatably connected to the second air bearing 42. The inner diameter of the first air bearing 41 is the same as the inner diameter of the second air bearing 42.

[0022] The volute 16 has an air inlet channel 18 and an air outlet channel 19. The second impeller 52 is located at the connection between the air inlet channel 18 and the air outlet channel 19. When the second impeller 52 rotates, on the one hand, a pressure difference is generated in the volute 16, which draws in external airflow from the air inlet channel 18 and discharges it from the air outlet channel 19, forming the main working airflow. On the other hand, part of the airflow on the high-pressure side of the second impeller 52 is forced to pass through the micron-level gap of the second air bearing 42, where a lubricating air film is formed to suspend the rotating shaft 21. Subsequently, this airflow enters the receiving cavity 11 to cool the stator 22 and the rotor 23, and finally merges with the cooling airflow passing through the first air bearing 41 and the guide hole 35 to form a through-type high-efficiency heat dissipation air duct.

[0023] The second limiting member 32 and the second air bearing 42 form a thrust chamber 33. A thrust plate 34 is fixed on the outer periphery of the rotating shaft 21. The thrust plate 34 has a circular structure and is located inside the thrust chamber 33. The thrust plate 34 is restricted by the thrust chamber 33 in the first direction. However, after the airflow from the air inlet channel 18 enters the thrust chamber 33, it flows into the gap between the second air bearing 42 and the rotating shaft 21 to form an air film before flowing into the receiving cavity 11. The mechanical limiting formed by the thrust plate 34 achieves precise axial positioning of the rotating shaft 21 and can effectively withstand the bidirectional axial force generated by the impeller. At the same time, the airflow entering the thrust chamber 33 will form an air film on the thrust end face, which will assist in bearing the axial load in a non-contact manner. Without affecting the original air flotation lubrication and internal cooling effect, the axial movement problem of the high-speed rotor 23 is solved, and the system rigidity and operational stability are significantly enhanced.

[0024] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A low-power self-cooling fan, characterized in that, include: The outer shell (1) has an internal cavity (11) and a first heat dissipation port (12), a second heat dissipation port (13), an air inlet channel (18) and an air outlet channel (19). The first heat dissipation port (12) and the second heat dissipation port (13) are respectively connected to the cavity (11). A rotating shaft (21) is rotatably connected to the outer casing (1) in a first direction; The rotor (23) is coaxially fixed to the outer periphery of the rotating shaft (21); The stator (22) is fixed in the receiving cavity (11) of the outer shell (1) and electromagnetically engages with the rotor (23) to drive the rotating shaft (21) to rotate; The first impeller (51) is fixed to one end of the rotating shaft (21) near the first heat dissipation port (12) and is used to pressurize the airflow flowing in from the first heat dissipation port (12) and then flow into the receiving cavity (11) to carry away the heat generated by the stator (22) and the rotor (23) and discharge it through the second heat dissipation port (13). The second impeller (52) is fixed at the other end of the rotating shaft (21) and located at the connection between the air inlet channel (18) and the air outlet channel (19), and is used to compress the airflow.

2. A low-power self-cooling fan according to claim 1, characterized in that: The outer casing (1) includes a heat dissipation casing (14), a main casing (15) and a volute (16) connected sequentially along the first direction. The first heat dissipation port (12) is located on the heat dissipation casing (14), the second heat dissipation port (13) is located near the middle part of the main casing (15), the air intake channel (18) and the air outlet channel (19) are located on the volute (16), and the receiving cavity (11) is located inside the main casing (15).

3. A low-power self-cooling fan according to claim 2, characterized in that: A first limiting member (31) is fixedly provided on one side of the main housing (15) near the heat dissipation housing (14). The first limiting member (31) is a ring structure, and its outer periphery is connected to the inner wall of the main housing (15). A plurality of guide holes (35) are provided on the first limiting member (31) for connecting the first heat dissipation port (12) and the receiving cavity (11).

4. A low-power self-cooling fan according to claim 3, characterized in that: The heat dissipation housing (14) is provided with a transition chamber (17), which connects the first heat dissipation port (12) and the guide hole (35). The first impeller (51) is located in the transition chamber (17) and is directly opposite the entrance of the guide hole (35).

5. A low-power self-cooling fan according to claim 4, characterized in that: The first limiting member (31) has a first air bearing (41) fixed on its inner side. The rotating shaft (21) passes through the first air bearing (41) and rotates with it to form an air film. The airflow from the first heat dissipation port (12) flows through the transition chamber (17), the gap between the first air bearing (41) and the rotating shaft (21) and then enters the receiving cavity (11).

6. A low-power self-cooling fan according to claim 5, characterized in that: A second limiting member (32) is fixedly provided on one side of the main housing (15) near the volute (16). A second air bearing (42) is fixedly provided on the inner side of the second limiting member (32). The second air bearing (42) is coaxially arranged with the first air bearing (41). The rotating shaft (21) passes through the second air bearing (42) and rotates with it to form an air film.

7. A low-power self-cooling fan according to claim 6, characterized in that: A thrust chamber (33) is formed between the second limiting member (32) and the second air bearing (42). A thrust plate (34) is fixed on the outer periphery of the rotating shaft (21). The thrust plate (34) is an annular structure and is located in the thrust chamber (33) to restrict the axial movement of the rotating shaft (21).

8. A low-power self-cooling fan according to claim 7, characterized in that: Part of the airflow from the air intake channel (18) can enter the thrust chamber (33), and after flowing through the gap between the second air bearing (42) and the shaft (21) to form an air film, it enters the receiving chamber (11).

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