Cooling fan assembly and air cooling motor using same

Abstract

The utility model discloses a heat radiation fan assembly and an air cooling motor using the same, and the heat radiation fan assembly comprises an air guide member which comprises a circular-ring-shaped pedestal and a ventilation hole formed in the circular-ring-shaped pedestal; at least one annular air guide cavity is formed in one shaft side end face of the annular base. The fan comprises an annular bracket and fan blades arranged in the annular bracket; at least one annular air guide groove is formed in the shaft side end face, facing the annular base, of the annular support. And each annular air guide cavity is suitable for being matched with one annular air guide groove in a staggered mode to form an S-shaped channel suitable for air zigzag circulation. According to the utility model, the radiating effect can be considered, the requirement on production precision is reduced, and the production difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a heat dissipation fan assembly and an air-cooled motor using the same. Background Art

[0002] When the air-cooled motor is running, the current generates a magnetic field that is converted into mechanical energy. A part of the current generates eddy currents on the iron core, which will be lost and generate heat sources, thus increasing the temperature of the motor. In order to keep the motor cool and keep it working normally at a suitable temperature without burning out, a fan is generally used to cool the motor.

[0003] For example, publication CN215934656U discloses a brushless motor for treadmills. This motor features cooling blades on the outside of the motor body, significantly increasing the amount of air drawn by the cooling fan, thereby improving the fan's cooling effect on the motor. These rear-mounted fans in air-cooled motors increase air flow into the motor, accelerating heat exchange and ensuring stable operation and longevity, leading to their widespread use.

[0004] For air-cooled motors with rear-mounted fans, which are widely used in the prior art, improving fan utilization requires reducing the gap between the fan and the motor housing to minimize ineffective air flow and ensure effective heat dissipation. Practical research and use have revealed that smaller assembly gaps require higher production precision. However, in actual production, cumulative assembly tolerances create production difficulties, making it difficult to effectively control the assembly gap within a range that minimizes ineffective air flow.

[0005] Therefore, for the air-cooled motor with a rear fan used in the prior art, its structure needs to be further optimized and improved in order to take into account the heat dissipation effect and reduce the production accuracy and difficulty. Utility Model Content

[0006] The first object of the present invention is to provide a heat dissipation fan assembly to solve the technical problem of taking into account the heat dissipation effect and reducing the requirements for production precision, thereby reducing the production difficulty.

[0007] The second object of the present invention is to provide an air-cooled motor to solve the technical problem of taking into account the heat dissipation effect and reducing the requirements for production accuracy, thereby reducing the production difficulty.

[0008] The heat dissipation fan assembly of the present utility model is realized as follows:

[0009] A heat dissipation fan assembly, comprising:

[0010] The air guide comprises a circular base and a ventilation hole formed in the circular base; an axial end surface of the circular base is provided with at least one annular air guide cavity;

[0011] A fan comprising a circular support and blades arranged in the circular support; the circular support is provided with at least one annular air guide groove on an axial end surface facing the circular base; and

[0012] Each of the annular air guiding cavities is adapted to be interlaced with an annular air guiding groove to form an S-shaped channel suitable for tortuous air circulation.

[0013] In an optional implementation of the present invention, the axial end surface of the annular base facing the fan is sequentially provided in the two annular air guide cavities along its radial direction; and

[0014] The annular bracket is provided with an annular air guide groove on the axial end surface facing the annular base;

[0015] The two annular walls of the annular air guiding groove are respectively inserted into an annular air guiding cavity.

[0016] In an optional embodiment of the present invention, the annular base is provided with a first air guide ring, a second air guide ring and a third air guide ring in sequence from outside to inside along its radial direction at intervals on the axial end surface facing the fan;

[0017] An annular air guiding cavity is formed between the first air guiding ring and the second air guiding ring, and another annular air guiding cavity is formed between the second air guiding ring and the third air guiding ring; and

[0018] The annular bracket has an axial end surface facing the annular base and is provided with an outer air guide ring and an inner air guide ring in sequence from the outside to the inside along its radial direction; an annular air guide groove is formed between the outer air guide ring and the inner air guide ring.

[0019] In an optional embodiment of the present invention, the annular bracket is provided with an annular wall extending along the annular bracket on the axial end surface facing the annular base and located on the side of the outer air guide ring facing away from the inner air guide ring;

[0020] An axial gap greater than 2.5 mm is formed between the annular wall and the first air guide ring.

[0021] In an optional implementation of the present invention, the outer air guide ring is inserted into the annular air guide cavity formed by the first air guide ring and the second air guide ring, and the insertion depth of the outer air guide ring is less than the depth of the annular air guide cavity;

[0022] The inner air guide ring is inserted into the annular air guide cavity formed by the second air guide ring and the third air guide ring, and the insertion depth of the inner air guide ring is less than the depth of the annular air guide cavity; and

[0023] A radial gap is formed between the outer air guide ring and the first air guide ring and the second air guide ring, and a radial gap is formed between the inner air guide ring and the second air guide ring and the third air guide ring.

[0024] In an optional implementation of the present invention, the radial gap formed by the inner air guide ring and the second air guide ring is smaller than the radial gap formed by the inner air guide ring and the third air guide ring.

[0025] In an optional implementation of the present invention, a radial gap formed by the inner air guide ring and the second air guide ring is greater than 1 mm.

[0026] In an optional implementation of the present invention, the cavity wall surface of the annular air guide cavity includes at least a partial arc-shaped surface along its radial direction; and

[0027] The groove wall surface of the annular air guide groove includes at least a partial arc-shaped surface along its radial direction.

[0028] In an optional implementation of the present invention, the outlet angle of the fan blade is greater than or equal to 45 degrees and less than 90 degrees.

[0029] The air-cooled motor of the present invention is realized as follows:

[0030] An air-cooled motor comprises: a motor body, a front end cover provided at one axial end of the motor body, a rear end cover provided at the other axial end of the motor body, and a heat dissipation fan assembly provided at the side of the rear end cover facing away from the motor body; wherein

[0031] The air guide of the heat dissipation fan assembly is located between the fan and the rear end cover;

[0032] The rotating shaft of the motor body sequentially passes through the rear end cover and the ventilation hole and is connected to the fan;

[0033] At least one vent hole is formed on each of the front end cover and the rear end cover.

[0034] In an optional implementation of the present invention, the air-cooled motor further comprises a cover provided on a side of the front end cover facing away from the motor main body;

[0035] The rotating shaft of the motor body passes through the front end cover and is connected to the housing; and

[0036] The housing includes a main board and an annular fin plate provided on the side of the main board facing the front end cover;

[0037] An axial gap suitable for air circulation is formed between the main board and the front end cover, and a radial gap suitable for air circulation is formed between the annular fin plate and the outer side wall of the motor main body.

[0038] By adopting the above technical solution, the present invention has the following beneficial effects: in the heat dissipation fan assembly and the air-cooled motor using the same, an S-shaped channel suitable for tortuous air circulation is formed between the air guide member in the heat dissipation fan assembly and the opposite surface of the fan, so that the air entering the S-shaped channel can only circulate along the rotating path (for the heat dissipation process of the air-cooled motor, it is ineffective air that does not flow into the interior of the motor to produce a heat exchange effect). In this way, during the circulation process, the collision between at least one wall surface in the S-shaped channel and the air causes the air volume to continuously attenuate, thereby reducing the amount of air entering the interior of the fan through the S-shaped channel. Based on this situation, even if the axial gap between the air guide member and the fan due to assembly is increased compared to the case where the S-shaped channel is not designed, it will not affect the total amount of ineffective air entering the fan. Therefore, the requirements for the axial installation gap between the air guide member and the fan can be reduced, thereby reducing the production difficulty and the requirements for production accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the exploded structure of the heat dissipation fan assembly of the present invention applied to a specific air-cooled motor;

[0040] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the heat dissipation fan assembly of the present invention applied to a specific air-cooled motor;

[0041] Figure 3 This is a partial cross-sectional enlarged structural diagram of the heat dissipation fan assembly of the present invention applied to a specific air-cooled motor;

[0042] Figure 4 This is a schematic structural diagram of the air guide member of the heat dissipation fan assembly of the present invention;

[0043] Figure 5 This is a schematic structural diagram of the fan of the heat dissipation fan assembly of the present invention;

[0044] Figure 6 This is a schematic structural diagram of the fan blades of the heat dissipation fan assembly of the present invention.

[0045] In the figure: a circular base 11, a ventilation hole 12, an annular air guide cavity 13, a first air guide ring 14, a second air guide ring 15, a third air guide ring 16, a circular bracket 21, fan blades 22, an annular air guide groove 23, a connecting part 24, an outer air guide ring 25, an inner air guide ring 26, an annular wall 27, an inner wall surface 28, a motor body 3, a rotating shaft 4, a front cover 51, a rear cover 52, a vent 53, a cover shell 6, a main board 61, an annular fin plate 62, and an inlet M. DETAILED DESCRIPTION

[0046] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0047] Example 1:

[0048] See also Figures 1 to 6 As shown, this embodiment provides a cooling fan assembly, which can be applied to a variety of motors that require heat dissipation, and can also be used in other structures. This embodiment does not make an absolute limitation to this, and it includes: an air guide member and a fan used in conjunction.

[0049] Specifically, the air guide includes a circular base 11 and a ventilation hole 12 formed in the circular base 11; the aperture of the ventilation hole 12 here is designed to be as large as possible so that effective air for heat dissipation can enter the fan through the ventilation hole 12 and then be discharged through the action of the fan.

[0050] Based on the above structure, when the air guide assembly of this embodiment is used in a motor that requires heat dissipation, the annular base 11 can be used to secure the air guide assembly to the motor. Furthermore, at least one annular air guide cavity 13 is provided on one axial end surface of the annular base 11; the annular air guide cavity 13 is located on the axial end surface of the annular base 11 that faces away from the motor.

[0051] The fan includes a circular support 21 and blades 22 disposed in the circular support. The circular support 21 is provided with at least one annular air guide groove 23 on the axial end surface facing the circular base 11. Based on this structure, it should be noted that each annular air guide cavity 13 is adapted to interlock with an annular air guide groove 23 to form an S-shaped channel suitable for tortuous air circulation. Under this structure, the air entering the S-shaped channel can only circulate along a rotating path (for the heat dissipation process of the motor, this is ineffective air that does not flow into the interior of the motor to produce a heat exchange effect). In this way, during the circulation process, the air volume continuously decreases due to the collision between at least one wall surface in the S-shaped channel and the air, thereby reducing the amount of air entering the fan through the S-shaped channel.

[0052] Here, an optional implementation is given as an example with reference to the accompanying drawings. Two annular air guide cavities 13 are arranged in sequence along the radial direction on the axial end surface of the circular ring base 11 facing the fan; and an annular air guide groove 23 is provided on the axial end surface of the circular ring bracket 21 facing the circular ring base 11; and the two annular walls 27 of the annular air guide groove 23 are each inserted into an annular air guide cavity 13.

[0053] More specifically, the annular base 11, on the axial end surface facing the fan, is provided with a first air guide ring 14, a second air guide ring 15, and a third air guide ring 16, spaced radially from outside to inside. An annular air guide cavity 13 is formed between the first and second air guide rings 14, 15, and another annular air guide cavity 13 is formed between the second and third air guide rings 15, 16. The annular bracket 21, on the axial end surface facing the annular base 11, is provided with an outer air guide ring 25 and an inner air guide ring 26, spaced radially from outside to inside. An annular air guide groove 23 is formed between the outer and inner air guide rings 25, 26.

[0054] Based on the above structure, the specific forming process of the S-shaped channel in this embodiment is as follows:

[0055] The outer air guide ring 25 is inserted into the annular air guide cavity 13 formed by the first air guide ring 14 and the second air guide ring 15, and the insertion depth of the outer air guide ring 25 is less than the depth of the annular air guide cavity 13; the inner air guide ring 26 is inserted into the annular air guide cavity 13 formed by the second air guide ring 15 and the third air guide ring 16, and the insertion depth of the inner air guide ring 26 is less than the depth of the annular air guide cavity 13; and radial gaps are formed between the outer air guide ring 25 and the first air guide ring 14 and the second air guide ring 15, respectively, and between the inner air guide ring 26 and the second air guide ring 15 and the third air guide ring 16, respectively.

[0056] Furthermore, it should be noted that the radial gap formed between the inner air guide ring 26 and the second air guide ring 15 in this embodiment is smaller than the radial gap formed between the inner air guide ring 26 and the third air guide ring 16, and the radial gap b formed between the inner air guide ring 26 and the second air guide ring 15 is greater than 1 mm. This radial gap b is larger than the 0.4 mm radial clearance required in the prior art without the S-shaped channel design, thereby reducing the production precision and difficulty requirements.

[0057] Based on the above structure, it should be noted that, in a specific optional implementation, the third air guide ring 16 forms the hole wall of the ventilation hole 12. In this regard, that is, for the ineffective air that is about to enter the fan along the S-shaped channel between the air guide and the fan, the third air guide ring 16 is the last wall that can form a stop for the ineffective air. To this end, from the axial dimension along the ventilation hole 12, the axial length of the third air guide ring 16 can be greater than that of the first air guide ring 14 and the second air guide ring 15. Moreover, in the structure where the axial length of the third air guide ring 16 is designed to be longer, it can also form a stop for the effective air flowing through the ventilation hole 12, reducing the total amount of air flowing into the S-shaped channel, thereby preventing the effective air and the ineffective air from intersecting in the S-shaped channel to form vortices and cause losses.

[0058] Based on the above situation, regarding the assembly gap between the fan and the air guide member of this embodiment, the situation of this embodiment is as follows:

[0059] An annular wall 27 extending along the annular support 21 is provided on the axial end surface of the annular base 11 and on the side of the outer air guide ring 25 facing away from the inner air guide ring 26. An axial clearance a greater than 2.5 mm is formed between the annular wall 27 and the first air guide ring 14. This axial clearance a of the annular wall 27 is greater than the 0.4 mm axial clearance required in conventional designs without an S-shaped channel, thereby reducing production precision and complexity.

[0060] In addition, in order to reduce the wind noise generated by the ineffective air flowing along the S-shaped channel, the cavity wall surface of the annular air guide cavity 13 in this embodiment includes at least a partial arc-shaped surface along its radial direction; and the groove wall surface of the annular air guide groove 23 includes at least a partial arc-shaped surface along its radial direction.

[0061] In addition, in an optional implementation, the following design is made regarding the fan:

[0062] First, the outlet angle A of the fan blade 22 is greater than or equal to 45 degrees and less than 90 degrees, and is preferably designed to be 60 degrees, thereby improving the efficiency of the fan.

[0063] Secondly, the main source of the fan's operating noise is the pressure pulsation on the wall. In this embodiment, the inner wall surface 28 of the annular base 11 away from the air guide and facing the fan blade 22 is designed to be a plane or a nearly plane structure, which can reduce this pressure pulsation and thus reduce the noise during the operation of the fan blade 22.

[0064] The above changes make the air flow smoother and the vortex less, which not only increases the air volume and improves the fan efficiency, but also reduces the pressure of the air on the wall, thereby reducing noise.

[0065] In summary, for the heat dissipation fan assembly used in this embodiment, combined with the attached Figure 3In the air guide member and fan shown, the invalid air enters the S-shaped channel from the axial gap a between the annular wall 27 and the first air guide ring 14, first flows along the annular air guide cavity 13 formed by the first air guide ring 14 and the second air guide ring 15, and then flows along the cavity wall of the annular air guide cavity 13 along the direction of the tangent K to the annular air guide groove 23 formed by the outer air guide ring 25 and the inner air guide ring 26. At this time, for the invalid air, a part of the invalid air flows along the groove wall of the annular air guide groove 23 to the axial gap a between the annular wall 27 and the first air guide ring 14, and the other part of the invalid air flows through the radial gap between the second air guide ring 15 and the inner air guide ring 26 into the annular air guide cavity 13 formed by the second air guide ring 15 and the third air guide ring 16. Here, since the radial gap b between the second air guide ring 15 and the inner air guide ring 26 is small, the amount of invalid air that can flow into the annular air guide cavity 13 formed by the second air guide ring 15 and the third air guide ring 16 through the radial gap b is small. Therefore, the design of the S-shaped channel in this embodiment can reduce the amount of ineffective air entering the fan through the fitting gap between the air guide and the fan, thereby taking into account the heat dissipation effect and reducing the requirements for production accuracy, thereby reducing production difficulty.

[0066] Example 2:

[0067] See also Figures 1 to 6 As shown, based on the cooling fan assembly of Example 1, this embodiment provides an air-cooled motor, including: a motor body 3, a front end cover 51 provided at one axial side end of the motor body 3, a rear end cover 52 provided at the other axial side end of the motor body 3, and a cooling fan assembly such as Example 1 provided at the side of the rear end cover 52 facing away from the motor body 3.

[0068] The air guide of the cooling fan assembly is located between the fan and the rear end cover 52; the rotating shaft 4 of the motor body 3 passes through the rear end cover 52 and the ventilation hole 12 in sequence and is connected to the fan; at least one ventilation hole 53 is formed on each of the front end cover 51 and the rear end cover 52. The motor body 3 involved in this embodiment can be any mature means in the prior art, including at least a motor housing and a stator assembly and a rotor assembly disposed in the motor housing, wherein the rotating shaft 4 cooperates with the rotor assembly. Under the action of the rotating shaft 4, the fan can rotate synchronously with the rotation of the rotating shaft 4. To this end, a connecting portion 24 for cooperating with the rotating shaft 4 is provided inside the annular bracket of the fan.

[0069] Based on the above structure, it should be noted that effective heat dissipation air enters the motor body 3 through the vents 53 in the front cover 51, where it exchanges heat with the heat energy generated by the operation of the stator and rotor assemblies. The hot air that has completed the heat exchange passes through the vents 53 in the rear cover 52, then through the vents 53 in the air guide, and finally is exhausted by the fan. This process is designed to improve the heat dissipation efficiency of the motor. Multiple vents 53 are provided on the front cover 51 and the rear cover 52, while meeting the requirements of their operational intensity.

[0070] In addition, in a specific optional implementation, the air-cooled motor used in this embodiment also includes a cover 6 arranged on the side of the front end cover 51 facing away from the motor main body 3; the rotating shaft 4 of the motor main body 3 passes through the front end cover 51 and is connected to the cover 6; the cover 6 here can rotate synchronously with the rotation of the rotating shaft 4, and the design of the cover 6 can form a turbulent effect on the air on the side of the front end cover 51, so that the air on the side of the front end cover 51 can flow to the vent 53 of the front end cover 51 as much as possible under the action of the cover 6.

[0071] More specifically, the housing 6 includes a main plate 61 and an annular fin 62 disposed on the side of the main plate 61 facing the front end cover 51. An axial gap, suitable for air circulation, is formed between the main plate 61 and the front end cover 51, and a radial gap, suitable for air circulation, is formed between the annular fin 62 and the outer wall of the motor body 3. The radial gap forms an inlet M for effective air intake to facilitate heat exchange within the motor body 3, while the axial gap is designed to allow effective air entering through the radial gap to pass through the vent holes 53 in the front end cover 51 and into the motor body 3.

[0072] In summary, for the air-cooled motor of this embodiment, the design of the cover 6 can increase the amount of effective air introduced, thereby improving the heat dissipation efficiency of the entire air-cooled motor and reducing the difficulty of production and assembly.

[0073] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0074] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0075] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0076] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0077] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0078] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A cooling fan assembly, characterized in that: include: An air guide member comprising a circular ring base and a ventilation hole formed in the circular ring base; At least one annular air guide cavity is provided on an axial end surface of the annular base; A fan comprising a circular support and fan blades arranged in the circular support; the circular support is provided with at least one annular air guide groove on its axial end surface facing the circular base; as well as Each of the annular air guiding cavities is adapted to be interlaced with an annular air guiding groove to form an S-shaped channel suitable for tortuous air circulation.

2. The heat dissipation fan assembly according to claim 1, characterized in that: The axial end surface of the annular base facing the fan is sequentially arranged in the two annular air guide cavities along its radial direction; and The annular bracket is provided with an annular air guide groove on the axial end surface facing the annular base; The two annular walls of the annular air guiding groove are respectively inserted into an annular air guiding cavity.

3. The heat dissipation fan assembly according to claim 2, characterized in that: The annular base is provided with a first air guide ring, a second air guide ring and a third air guide ring in sequence from the outside to the inside along its radial direction. An annular air guiding cavity is formed between the first air guiding ring and the second air guiding ring, and another annular air guiding cavity is formed between the second air guiding ring and the third air guiding ring; and The annular bracket has an axial end surface facing the annular base and is provided with an outer air guide ring and an inner air guide ring in sequence from the outside to the inside along its radial direction; an annular air guide groove is formed between the outer air guide ring and the inner air guide ring.

4. The heat dissipation fan assembly according to claim 3, characterized in that: The annular bracket is provided with an annular wall extending along the annular bracket on the axial end surface facing the annular base and located on the side of the outer air guide ring facing away from the inner air guide ring; An axial gap greater than 2.5 mm is formed between the annular wall and the first air guide ring.

5. The heat dissipation fan assembly according to claim 3, characterized in that: The outer air guide ring is inserted into the annular air guide cavity formed by the first air guide ring and the second air guide ring, and the insertion depth of the outer air guide ring is less than the depth of the annular air guide cavity; The inner air guide ring is inserted into the annular air guide cavity formed by the second air guide ring and the third air guide ring, and the insertion depth of the inner air guide ring is less than the depth of the annular air guide cavity; and A radial gap is formed between the outer air guide ring and the first air guide ring and the second air guide ring, and a radial gap is formed between the inner air guide ring and the second air guide ring and the third air guide ring.

6. The heat dissipation fan assembly according to claim 5, characterized in that: The radial gap formed by the inner air guide ring and the second air guide ring is smaller than the radial gap formed by the inner air guide ring and the third air guide ring.

7. The heat dissipation fan assembly according to claim 6, characterized in that: The radial gap formed by the inner air guide ring and the second air guide ring is greater than 1 mm.

8. The heat dissipation fan assembly according to any one of claims 1 to 7, characterized in that: The cavity wall surface of the annular air guide cavity includes at least a partial arc-shaped surface along its radial direction; and The groove wall surface of the annular air guide groove includes at least a partial arc-shaped surface along its radial direction.

9. The heat dissipation fan assembly according to claim 1, wherein: The outlet angle of the fan blade is greater than or equal to 45 degrees and less than 90 degrees.

10. An air-cooled motor, characterized in that: include: A motor body, a front end cover provided at one axial end of the motor body, a rear end cover provided at the other axial end of the motor body, and a cooling fan assembly according to any one of claims 1 to 9 provided at a side of the rear end cover facing away from the motor body; wherein The air guide of the heat dissipation fan assembly is located between the fan and the rear end cover; The rotating shaft of the motor body sequentially passes through the rear end cover and the ventilation hole and is connected to the fan; At least one vent hole is formed on each of the front end cover and the rear end cover.

11. The air-cooled motor according to claim 10, characterized in that: The air-cooled motor further comprises a cover shell provided on the side of the front end cover facing away from the motor main body; The rotating shaft of the motor body passes through the front end cover and is connected to the housing; and The housing includes a main board and an annular fin plate provided on the side of the main board facing the front end cover; An axial gap suitable for air circulation is formed between the main board and the front end cover, and a radial gap suitable for air circulation is formed between the annular fin plate and the outer side wall of the motor main body.

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