Cooling fan assembly and motor using same

Abstract

The utility model discloses a cooling fan assembly and a motor using the same, and the cooling fan assembly comprises a fan blade unit which comprises a fan blade group which is formed through injection molding and is provided with a central through hole, and a metal insert which is fixed in the central through hole of the fan blade group through insert injection molding; the metal insert comprises a main body part fixed in the central through hole and at least one connecting part which is integrally connected with the outer wall of the main body part and is suitable for being wrapped by the fan blade group in an injection molding manner; a shaft hole is formed in the main body part; the rotating shaft penetrates through the shaft hole and is in interference fit connection with the shaft hole. The motor is reliable and stable in structure, is not liable to deform and damage, and can enhance the heat dissipation effect of the motor.

Description

Technical Field

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

[0002] To dissipate heat from the motor, a conventional method is to assemble a fan for heat dissipation in the motor to achieve the purpose of dissipating heat from the motor. Considering cost and weight issues, most of these fans are plastic fans, and the fan is fixed by an interference fit between the mounting hole in the middle of the fan and the rotating shaft of the motor.

[0003] Through actual research and use, it is found that when a plastic fan is directly in interference fit with the motor rotating shaft, there are many problems and defects. For example, the direct interference fit between the plastic fan and the metal rotating shaft of the motor may cause the plastic parts to crack, resulting in fan damage; another example is that the motor rotating shaft, as one of the main heat sources of the motor, is directly in contact with the plastic fan, which will cause the plastic fan to melt due to heat and lead to problems such as fan loosening.

[0004] In this regard, the patent with the publication number CN204205836U proposes to set a polygonal groove at the end of the fan blade sleeve, install a metal bushing in the groove, and the sleeve and the bushing are sleeved on the rotating shaft together to enhance the bonding force between the fan blade and the shaft. In this structure, the interference fit between the metal bushing and the shaft is used to increase the bonding force between the fan blade and the shaft. Although the problem of potential hazards caused by the direct contact between the rotor shaft and the plastic fan is solved, there is still a risk of loosening between the metal bushing in the groove and the fan blade after long-term use.

[0005] Another example is a wind turbine bearing heat dissipation fan disclosed in the patent with the publication number CN216044211U, which includes a generator shaft, and a shaft expansion sleeve is sleeved on the surface of the generator shaft; a heat dissipation fan inner ring is sleeved on the surface of the generator shaft; connection bolt holes are opened on the surfaces of the heat dissipation fan inner ring and the shaft expansion sleeve, and the heat dissipation fan inner ring and the shaft expansion sleeve are fixedly connected by bolts. In this structure, the heat dissipation fan and the shaft expansion sleeve are fixed by bolts. Although the loosening of the two can be avoided, the assembly is cumbersome, and in order to better cooperate with the bolts, both the shaft expansion sleeve and the heat dissipation fan inner ring need to have a certain thickness. In this structure, the overall weight of the fan will inevitably increase, thereby increasing the load on the motor rotating shaft corresponding to the fan operation.

[0006] In summary, in view of the drawbacks of the existing technologies in different time periods, it is necessary to further improve the structure by optimizing the cooperation effect between the fan and the motor shaft. Summary of the Utility Model

[0007] The first object of the utility model is to provide a heat dissipation fan assembly to solve the technical problem of optimizing the cooperation effect between the fan and the motor shaft.

[0008] The second object of the present utility model is to provide a motor to solve the technical problem of optimizing the matching effect between the fan and the motor shaft in the motor.

[0009] The heat dissipation fan assembly of the present utility model is realized as follows:

[0010] A heat dissipation fan assembly includes:

[0011] A fan blade unit, which includes a fan blade group formed by injection molding and having a central through hole, and a metal insert fixed in the central through hole of the fan blade group by insert injection molding; the metal insert includes a main body portion fixed in the central through hole and at least one connecting portion integrally connected to the outer wall of the main body portion and adapted to be injection molded and wrapped by the fan blade group; a shaft hole is provided in the main body portion;

[0012] A rotating shaft, which is adapted to pass through the shaft hole and is connected to the shaft hole in an interference fit.

[0013] In an optional embodiment of the present utility model, the main body portion is a cylindrical body; and each of the connecting portions is an annular flange integrally formed on the outer side wall of the cylindrical body.

[0014] In an optional embodiment of the present utility model, at least one of the connecting portions is arranged perpendicular to the outer side wall of the main body portion.

[0015] In an optional embodiment of the present utility model, at least one connecting portion is connected to one axial end of the main body portion, and the axial length of the main body portion is less than the axial length of the central through hole; and

[0016] When the fan blade unit is fixed in place with the rotating shaft, a radial gap is formed between a partial hole wall of the central through hole and the outer side wall of the rotating shaft.

[0017] In an optional embodiment of the present utility model, one axial end of the radial gap extends to one axial end of the central through hole, and the other axial end of the radial gap extends to one of the connecting portions; and

[0018] The proportion of the axial length of the radial gap in the axial length of the central through hole is greater than 1 / 3 and less than 1 / 2.

[0019] In an optional embodiment of the present utility model, the axial end of the main body portion facing away from the radial gap is flush with the axial end of the central through hole.

[0020] In an optional embodiment of the present utility model, a plurality of counterbores or through holes extending along its axial direction are spaced apart on at least one of the connecting portions.

[0021] In an optional embodiment of the present utility model, at least two ribs are spaced apart on the side wall of the portion where the rotating shaft is in interference fit with the shaft hole of the main body portion.

[0022] In an alternative embodiment of the present utility model, the fan blade group includes an integrally formed upper hub, a lower hub, a shaft sleeve disposed along the rotation axis of the fan blade group, and a plurality of blades arranged at intervals in the circumferential direction around the shaft sleeve;

[0023] The portion of each blade away from the shaft sleeve is disposed between the upper hub and the lower hub; and

[0024] Both the upper hub and the lower hub are annular bodies disposed around the shaft sleeve.

[0025] The motor of the present utility model is implemented as follows:

[0026] A motor includes: the heat dissipation fan assembly described above.

[0027] By adopting the above technical solution, the present utility model has the following beneficial effects: For the heat dissipation fan assembly of the present utility model and the motor using the same, the adopted fan blade unit is in interference fit with the rotating shaft through a metal insert, which can ensure the cooperation strength between the rotating shaft and the fan blade unit while preventing the plastic fan blade group from cracking and the plastic part from melting due to high temperature, resulting in the hidden danger of the fan becoming loose. Moreover, for the cooperation between the metal insert itself and the fan blade group, at least part of the metal insert is wrapped in the fan blade group, and the cooperation structure formed by the metal insert and the fan blade group is strengthened by insert injection molding, thereby preventing the problem of separation between the fan blade group and the metal insert. Description of the Drawings

[0028] Figure 1 is an exploded structural schematic diagram of the heat dissipation fan assembly of Embodiment 1 of the present application;

[0029] Figure 2 is an exploded structural schematic diagram of the fan blade unit of the heat dissipation fan assembly of Embodiment 1 of the present application;

[0030] Figure 3 is a structural schematic diagram of the fan blade group of the fan blade unit of the heat dissipation fan assembly of Embodiment 1 of the present application;

[0031] Figure 4 is a structural schematic diagram of the metal insert of the fan blade unit of the heat dissipation fan assembly of Embodiment 1 of the present application;

[0032] Figure 5 is a schematic diagram of the cooperation structure between the fan blade unit of the heat dissipation fan assembly of Embodiment 1 of the present application and the rotating shaft;

[0033] Figure 6 is a partial cooperation structure schematic diagram between the fan blade unit of the heat dissipation fan assembly of Embodiment 1 of the present application and the rotating shaft;

[0034] Figure 7It is a schematic diagram of the assembly direction of the fan blade unit and the rotating shaft of the heat dissipation fan assembly according to Embodiment 1 of the present application;

[0035] Figure 8 It is a schematic structural diagram of the assembly process of the fan blade unit and the rotating shaft of the heat dissipation fan assembly according to Embodiment 1 of the present application;

[0036] Figure 9 It is a partially enlarged schematic structural diagram of the assembly process of the fan blade unit and the rotating shaft of the heat dissipation fan assembly according to Embodiment 1 of the present application;

[0037] Figure 10 It is a schematic diagram of the cooperation between the heat dissipation fan assembly and the positioning member during the assembly process according to Embodiment 1 of the present application.

[0038] In the figure: rotating shaft 1, rib 11, metal insert 2, main body part 21, shaft end connection part 22, through hole 23, shaft hole 25, fan blade group 3, upper hub 31, lower hub 32, shaft sleeve 33, blade 34, radial clearance K, central through hole 35, press joint 41, positioning member 42, rotor assembly 5. Detailed implementation manners

[0039] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments in conjunction with the accompanying drawings.

[0040] Embodiment 1:

[0041] Please refer to Figures 1 to 10 As shown, this embodiment provides a heat dissipation fan assembly, including: a fan blade unit and a rotating shaft 1 that are used in cooperation. The fan blade unit is fixed on the rotating shaft 1, and the rotation of the rotating shaft 1 drives the operation of the fan blade unit.

[0042] Specifically, first is the fan blade unit, which includes a fan blade group 3 with a central through hole 35 formed by injection molding and a metal insert 2 fixed in the central through hole 35 of the fan blade group 3 by insert injection molding.

[0043] Among them, the fan blade group 3 includes an integrally formed upper hub 31, a lower hub 32, a shaft sleeve 33 arranged along the rotation axis 1 line of the fan blade group 3, and a plurality of blades 34 arranged at intervals in the circumferential direction around the shaft sleeve 33; the central through hole 35 is formed in the shaft sleeve 33, and the part of each blade 34 away from the shaft sleeve 33 is arranged between the upper hub 31 and the lower hub 32; and both the upper hub 31 and the lower hub 32 are annular bodies arranged around the shaft sleeve 33.

[0044] Based on the above structure, taking each blade 34 as an example, one end of it is fixed on the sleeve 33, and the other end is fixed by the upper hub 31 and the lower hub 32, thereby improving the service strength of the blade 34. Moreover, both the upper hub 31 and the lower hub 32 adopt a toroidal body. In this structure, that is to say, for the overall fan blade group 3, air inlets are formed not only at the axial sides of the upper hub 31 and the lower hub 32, but also at the circumferential sides of the blades 34. Through the cooperation of air inlets in multiple directions, the air output of the fan blade group 3 is increased, thereby improving the heat dissipation effect on the motor when it is applied to the motor. That is to say, in this embodiment, by adopting the toroidal upper hub 31 and lower hub 32, while taking into account the service strength of the fan blade unit, the heat dissipation effect is also taken into account.

[0045] Based on the above situation, it should be noted that the upper hub 31 and the lower hub 32 here can optionally adopt the same toroidal structure, or different toroidal bodies. The difference here can be specifically reflected in the radial width of the toroidal body. For example, the radial width of the lower hub 32 is smaller than that of the upper hub 31. When the heat dissipation fan assembly with this structure is applied to the motor, the lower hub 32 faces the stator and rotor of the motor, thereby increasing the air blowing volume at the axial side of the lower hub 32 facing the stator and rotor of the motor, and then accelerating the heat dissipation speed during the use of the motor.

[0046] In addition, it should also be noted that for the sleeve 33 of this embodiment, its axial height is less than the distance formed between the upper hub 31 and the lower hub 32. And for the fan blade unit after injection molding, the sleeve 33 is located at the middle position of the distance formed between the upper hub 31 and the lower hub 32. In this structure, the end of each blade 34 connected to the sleeve 33 is recessed relative to the end of the blade 34 connected to the upper hub 31 and the lower hub 32. Specifically, for the overall fan blade unit, regardless of which axial end face, the sleeve 33 is recessed relative to the upper hub 31 and the lower hub 32. Based on the fan blade unit with this structure, the recessed areas can be used to cooperate with the air inlets at both of its axial sides to form air storage intervals, so as to form a vortex effect during the air flow at both axial sides of the fan blade unit, and accelerate the heat dissipation speed of the motor.

[0047] Next, it should be noted that regarding the metal insert 2 adopted in this embodiment:

[0048] Generally speaking, the metal insert 2 includes a main body portion 21 fixed in the central through hole 35 and at least one connecting portion integrally connected to the outer wall of the main body portion 21 and adapted to be injection-molded and wrapped by the fan blade group 3; a shaft hole 25 is provided in the main body portion 21. The shaft hole here is adapted for the rotating shaft 1 to pass through, and the rotating shaft 1 is connected to the shaft hole 25 by interference fit. In an optional implementation case here, at least two ribs 11 are provided at intervals on the side wall of the portion where the rotating shaft 1 and the shaft hole 25 of the main body portion 21 are in interference fit. Under the design of the ribs 11 here, the fitting structure formed by the rotating shaft 1 and the main body portion 21 is more firm.

[0049] More specifically, in a preferred implementation case, the main body portion 21 is a cylindrical body; and each connecting portion is an annular flange integrally formed on the outer side wall of the cylindrical body. Considering that the connecting portion here is mainly for forming a firm fit with the plastic fan blade group 3, one connecting portion, two connecting portions or three connecting portions distributed at intervals along the axial direction of the main body portion 21 can be adopted. This embodiment does not make an absolute limitation on this.

[0050] When multiple connecting portions are adopted, the shapes and sizes of the connecting portions can be the same or not the same. This embodiment also does not make an absolute limitation on this, that is, as long as the situation that the connecting portion is wrapped by the fan blade group 3 during the injection molding of the fan blade group 3 meets the use requirements of this embodiment.

[0051] Next, in combination with the following, this embodiment only takes the case of designing one connecting portion as an example with reference to the drawings. Regarding this connecting portion, a plurality of counterbores or through holes 23 extending along its axial direction can be provided at intervals on the connecting portion, thereby improving the firmness of the structure formed by the connecting portion and the plastic fan blade group 3.

[0052] In addition, considering that the fan blade unit of this embodiment needs to form an interference fit effect with the rotating shaft 1, a crimping tooling needs to be used to press-fit the fan blade unit onto the rotating shaft 1 during the processing. And the fan blade group 3 is an injection-molded part. If the crimping tooling directly applies the pressing force on the fan blade group 3, it may cause deformation of the fan blade group 3. Therefore, this embodiment makes the following design:

[0053] First, the shaft side end of the main body portion 21 facing away from the radial gap K is flush with the shaft side end of the central through hole 35.

[0054] Second, if only one connecting portion is designed, the connecting portion is arranged perpendicular to the outer side wall of the main body portion 21. If there are multiple connecting portions, at least one connecting portion is arranged perpendicular to the outer side wall of the main body portion 21, and this connecting portion is located at one shaft end of the multiple connecting portions. For the convenience of description, for the connecting portion located at one shaft end of the multiple connecting portions and arranged perpendicular to the main body portion 21, it is defined as the shaft end connecting portion 22 in the following description.

[0055] Furthermore, in an alternative embodiment, the axial length of the main body portion 21 is less than the axial length of the central through hole 35; and when the fan blade unit is fixed in place with the rotating shaft 1, a radial gap K is formed between a partial hole wall of the central through hole 35 and the outer side wall of the rotating shaft 1. At this time, a U-shaped groove can also be formed between the radial gap K and the shaft end connecting portion 22.

[0056] Regarding the above U-shaped groove, it is also necessary to note that the groove opening of the U-shaped groove extends to one of the axial ends of the central through hole 35, and the axial length of the U-shaped groove (radial gap K) accounts for a proportion greater than 1 / 3 and less than 1 / 2 of the axial length of the central through hole 35. Through the design of the U-shaped groove here, on the one hand, the smoothness of demolding of the fan blade group 3 and the metal insert 2 after insert molding is improved, and on the other hand, it plays a guiding role during the pre-assembly process of the rotating shaft 1 when the rotating shaft 1 and the fan blade unit are press-fitted, preventing the fan blade unit from shaking and improving the convenience and efficiency of the press-fitting operation.

[0057] As Figures 7 to 10 shown, when the rotating shaft 1 is press-fitted into the fan blade unit through the press head 41 of the press-fitting tooling in this structure, the fan blade group 3 is placed upside down and fixed on the positioning member 42, so that the end face of the main body portion 21 of the metal insert 2 flush with the axial end of the central through hole 35 abuts against the positioning member 42, that is, the positioning member 42 plays a positioning and supporting role for the fan blade group 3 on the side facing away from the press head 41. Then, the shaft extension end of the rotating shaft 1 equipped with the rotor assembly 5 is passed downward through the central through hole 35 and pre-assembled on the fan blade unit. During this process, the radial gap K can play a guiding role during the pre-assembly process of the rotating shaft 1. After the pre-assembly is completed, a vertically downward force F is applied to the rotating shaft 1 or the rotor assembly 5 through the press-fitting tooling. For the positioning member 42 on the side of the fan blade group 3 facing away from the press head 41, it will receive the press-fitting force brought by the press-fitting tooling. However, due to the mutual action of forces, the positioning member 42 will also generate a reaction force on the fan blade unit, pressing the fan blade unit onto the rotating shaft 1. During this process, due to the mutual action of forces, the positioning member 42 will also generate a reaction force on the fan blade unit, and this reaction force directly acts on the main body portion 21 of the metal insert 2, so it will not cause damage to the fan blade group 3.

[0058] In addition, it is also necessary to note that in an alternative embodiment, regarding the shaft end connecting portion 22 that cooperates with the radial gap K to form the U-shaped groove, taking the circular ring structure as an example, only a part of its radial dimension is located in the U-shaped groove, while the other part is embedded in the fan blade group 3. Such a structure is mainly to simultaneously take into account the use requirements of adapting to the press-fitting tooling and the problem of improving the firmness of the connection structure formed by the metal insert 2 and the fan blade unit.

[0059] In summary, for the heat dissipation fan assembly of this embodiment, not only is the structure reliable and stable, not easily deformed or damaged, but also when applied to the motor, it can enhance the heat dissipation effect of the motor.

[0060] Embodiment 2:

[0061] Based on the heat dissipation fan assembly of Embodiment 1, this embodiment provides a motor, including: the heat dissipation fan assembly of Embodiment 1.

[0062] In the above specific embodiments, the purpose, technical solution, and beneficial effects of the present utility model have been further described in detail. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0063] In the description of the present utility model, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0064] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0065] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present utility model is habitually placed, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0066] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0067] In the present utility model, unless otherwise clearly defined and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being above, over and on the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

Claims

1. A cooling fan assembly, characterized in that: include: The fan blade unit comprises an injection-molded fan blade group having a central through hole and a metal insert fixed in the central through hole of the fan blade group by insert injection molding; the metal insert comprises a main body fixed in the central through hole and at least one connecting part integrally connected to the outer wall of the main body and suitable for being injection-molded and wrapped by the fan blade group; the main body is provided with an axial hole; The rotating shaft is adapted to pass through the shaft hole and be connected with the shaft hole by interference fit.

2. The heat dissipation fan assembly according to claim 1, characterized in that: The main body is a cylindrical body; and Each of the connecting parts is an annular flange integrally formed on the outer wall of the cylindrical body.

3. The heat dissipation fan assembly according to claim 2, characterized in that: At least one of the connecting parts is arranged vertically to the outer side wall of the main body.

4. The heat dissipation fan assembly according to claim 3, characterized in that: At least one connecting portion is connected to an axial end of the main body, and an axial length of the main body is smaller than an axial length of the central through hole; and When the fan blade unit and the rotating shaft are fixed in place, a radial gap is formed between a portion of the hole wall of the central through hole and the outer side wall of the rotating shaft.

5. The heat dissipation fan assembly according to claim 4, characterized in that: One axial end of the radial gap extends to one of the axial side ends of the central through hole, and the other axial end of the radial gap extends to a connecting portion; and The ratio of the axial length of the radial gap to the axial length of the central through hole is greater than 1 / 3 and less than 1 / 2.

6. The heat dissipation fan assembly according to claim 4 or 5, characterized in that: The axial side end of the main body portion facing away from the radial gap is flush with the axial side end of the central through hole.

7. The heat dissipation fan assembly according to any one of claims 1 to 5, characterized in that: At least one of the connecting parts is provided with a plurality of countersunk holes or through holes extending along the axial direction thereof at intervals.

8. The heat dissipation fan assembly according to claim 1, characterized in that: At least two convex ribs are arranged at intervals on the side wall of the portion where the rotating shaft and the shaft hole of the main body are interference-fitted.

9. The heat dissipation fan assembly according to claim 1, characterized in that: The fan blade assembly includes an integrally formed upper hub, a lower hub, a shaft sleeve arranged along the rotation axis of the fan blade assembly, and a plurality of blades arranged at intervals in a circumferential direction around the shaft sleeve; The portion of each blade away from the sleeve is disposed between the upper hub and the lower hub; and The upper hub and the lower hub are both annular bodies arranged around the shaft sleeve.

10. A motor, characterized in that: include: A cooling fan assembly as claimed in any one of claims 1 to 9.

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