Drive assembly

Abstract

The utility model provides a driving assembly which comprises a cylinder body, a driving assembly and a driving assembly, and the cylinder body comprises an outer ring part, an inner ring part and a plurality of connecting blades connecting the outer ring part and the inner ring part; the fan is contained in the outer ring part and arranged on the rear side of the inner ring part, and the fan comprises a hub and a plurality of blades arranged outside the hub in a surrounding mode at intervals; the motor comprises a stator assembly and a rotor assembly, the outer diameter of the motor is smaller than the inner diameter of the inner ring part, and the motor is installed on the inner side of the inner ring part; and the rear end of the fan backwards exceeds the rear end of the outer ring part. The rear end of the fan backwards exceeds the rear end of the outer ring part, so that flow suction and flow cutting of the fan are facilitated, the air inlet capacity is enhanced, and the air outlet effect is improved.

Description

Technical Field

[0001] The present application relates to the field of fan technology, and in particular to a drive assembly with good air intake effect. Background Art

[0002] As the size of daily electronic products continues to shrink, the requirements for the size and portability of fans are also getting higher and higher. In existing handheld fans, the drive components take up a lot of space, which compresses the air outlet channel and reduces the air outlet effect.

[0003] How to reasonably arrange the driving components, optimize the air outlet channel and increase the air volume in a handheld fan with limited size is an urgent problem that needs to be solved. Summary of the Invention

[0004] In view of this, the present application provides a drive assembly, which facilitates the fan to absorb and cut flow by setting the rear end of the fan to extend backward beyond the rear end of the outer ring part, thereby enhancing the air intake capacity and improving the air outlet effect.

[0005] The present application provides a drive assembly, comprising: a cylinder, comprising an outer ring portion, an inner ring portion, and a plurality of connecting blades connecting the outer ring portion and the inner ring portion; a fan, accommodated in the outer ring portion and arranged on the rear side of the inner ring portion, the fan comprising a hub and a plurality of blades arranged at intervals around the outside of the hub; a motor, comprising a stator assembly and a rotor assembly, the outer diameter of the motor being smaller than the inner diameter of the inner ring portion, the motor being installed on the inner side of the inner ring portion; wherein the rear end of the fan extends rearward beyond the rear end of the outer ring portion.

[0006] Furthermore, the outer diameter of the motor is smaller than the maximum inner diameter of the hub; the leading edge of each blade is provided with a plurality of first serrations, and the trailing edge of each connecting blade is provided with a plurality of second serrations.

[0007] Furthermore, the ratio of the tooth width of the first sawtooth to the length of the leading edge of the blade is in the range of 0.05-0.2, the ratio of the spacing between two adjacent first sawteeth to the tooth width of the first sawtooth is in the range of 0-1, and the ratio of the tooth depth of the first sawtooth to the tooth width of the first sawtooth is in the range of 0.5-2; the ratio of the tooth width of the second sawtooth to the length of the trailing edge of the connecting leaf is in the range of 0.05-0.2, the ratio of the spacing between two adjacent second sawteeth to the tooth width of the second sawtooth is in the range of 0-1, and the ratio of the tooth depth of the second sawtooth to the tooth width of the second sawtooth is in the range of 0.5-2.

[0008] Furthermore, the hub radially increases from back to front, the inner ring portion radially remains unchanged from back to front, and the maximum diameter of the hub differs from the diameter of the inner ring portion by less than 2 mm; the blades rotate clockwise from back to front, and the connecting leaves first rotate counterclockwise from back to front and then extend straight forward.

[0009] Furthermore, a mounting portion is provided in the inner ring portion, and the motor further includes a bearing seat, and the bearing seat is mounted on the mounting portion.

[0010] Furthermore, the bearing seat is made of metal, and the mounting portion is made of plastic. The bearing seat is fixedly connected to the mounting portion by one or more methods including in-mold injection molding, ultrasonic welding, hot melt, glue, and tight fit press-in.

[0011] Furthermore, the rotor assembly includes a rotating shaft, a bearing assembly, a magnetic ring and a yoke, the bearing assembly is arranged in the bearing seat, one end of the rotating shaft is fixed in the bearing seat through the bearing assembly, the magnetic ring is fixed to the radial inner side of the yoke, the yoke is fixedly connected to the rotating shaft, and the yoke and the magnetic ring are arranged on the radial outer side of the bearing seat; the stator assembly is arranged between the bearing seat and the magnetic ring, and the other end of the rotating shaft is fixedly connected to the fan.

[0012] Furthermore, the yoke includes an outer wall, an inner wall and a connecting wall, the connecting wall connects the outer wall and the inner wall, the inner wall is arranged on the inner side of the outer wall, the inner wall is fastened to the rotating shaft, and the connecting wall is penetrated by a plurality of through holes.

[0013] Furthermore, the bearing assembly includes a first bearing located in the front, a second bearing located in the rear, and a buffer member arranged between the first bearing and the second bearing, the front end of the inner wall directly abuts the second bearing, or an elastic member is provided between the front end of the inner wall and the second bearing.

[0014] Furthermore, the motor is a three-phase high-speed motor, and the motor also includes a drive plate. A fixing hole is provided on the inner side of the inner ring portion, and the drive plate is provided with a fixing opening. The fixing piece passes through the fixing opening and is fixed to the fixing hole.

[0015] Compared with the prior art, the drive assembly of the present application has the following beneficial effects: by setting the rear end of the fan to extend backward beyond the rear end of the outer ring part, it is beneficial for the fan to absorb and cut flow, thereby enhancing the air intake capacity and improving the air outlet effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a handheld fan according to an embodiment of the present application;

[0017] Figure 2 This is an exploded view of a handheld fan according to an embodiment of the present application;

[0018] Figure 3 is a cross-sectional view of a handheld fan according to an embodiment of the present application;

[0019] Figure 4 is a cross-sectional view of a drive assembly according to an embodiment of the present application;

[0020] Figure 5 is another cross-sectional view of a drive assembly according to an embodiment of the present application;

[0021] Figure 6 is an exploded view of a drive assembly according to an embodiment of the present application;

[0022] Figure 7 This is an exploded schematic diagram of a housing and a support frame according to an embodiment of the present application;

[0023] Figure 8 This is a schematic diagram of the assembly of the housing, support frame, first connecting member and handheld part according to an embodiment of the present application;

[0024] Figure 9 yes Figure 8 sectional view of

[0025] Figure 10 is a cross-sectional view of a housing, a support frame, a first connecting member, and a handheld portion of another embodiment of the present application;

[0026] Figure 11 This is a three-dimensional diagram of a battery module according to an embodiment of the present application;

[0027] Figure 12 This is an exploded view of a battery module according to an embodiment of the present application;

[0028] Figure 13 This is a cross-sectional view of a battery module according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to facilitate a better understanding of the purpose, structure, features and effects of this application, this application is further described in conjunction with the accompanying drawings and specific implementation methods.

[0030] It should be noted that when an element is considered to be “connected to” another element, it can be directly connected to the other element or there may be an intervening element at the same time.

[0031] In this application, descriptions such as “first”, “second”, etc. are only used for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0032] In the description of this application, the terms "front", "back", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on this application.

[0033] like Figure 1 As shown, the handheld fan of the present application includes an air outlet component 100 and a handheld portion 200 , and the air outlet component 100 is connected to the handheld portion 200 .

[0034] like Figures 1 to 3 As shown, in one embodiment, the handheld portion 200 includes a hand shell 10, which contains a battery module 20 and a control component 60. The air outlet component 100 includes a housing 1 and a drive component, which is located within the housing 1 and includes a motor 8 and a fan 9. The control component 60 controls the battery module 20 to supply power to the motor 8, which drives the fan 9 to rotate and generate wind.

[0035] like Figure 3 、 Figure 4 and Figure 6 As shown, in one embodiment, the drive assembly includes a cylinder 7, a fan 9 and a motor 8. The cylinder 7 includes an outer ring portion 71, an inner ring portion 72, and a plurality of connecting blades 73 connecting the outer ring portion 71 and the inner ring portion 72. The fan 9 is accommodated in the outer ring portion 71 and is arranged on the rear side of the inner ring portion 72. The motor 8 includes a stator assembly 81 and a rotor assembly 82. The outer diameter of the motor 8 is smaller than the inner diameter of the inner ring portion 72, and the motor 8 is installed on the inner side of the inner ring portion 72. Among them, the rear end of the fan 9 extends backward beyond the rear end of the outer ring portion 71, which is conducive to the fan 9 to absorb and cut the airflow on the rear side of the cylinder 7, thereby forming a stronger wind. In this embodiment, the outside of the cylinder 7 is also wrapped with a buffer sleeve (not numbered, the same below). Of course, in other embodiments, the buffer sleeve may not be provided.

[0036] like Figure 3 、 Figure 4 and Figure 6As shown, in one embodiment, the fan 9 includes a hub 91 and a plurality of blades 92 arranged at intervals around the outside of the hub 91. The outer diameter of the motor 8 is smaller than the maximum inner diameter of the hub 91, so a portion of the motor 8 can also be accommodated on the inner side of the hub 91. In this embodiment, the hub 91 radially increases from back to front, the inner ring portion 72 remains unchanged radially from back to front, the maximum diameter of the hub 91 is equal to the diameter of the inner ring portion 72, and the wind generated by the rotation of the fan 9 can flow smoothly to the outside of the inner ring portion 72, reducing wind resistance and wind loss. Of course, in other embodiments, the maximum diameter of the hub 91 and the diameter of the inner ring portion 72 differ by less than 2 mm, which can also achieve the effect of reducing wind resistance and wind loss.

[0037] like Figures 3 to 6 As shown, in one embodiment, the leading edge of each blade 92 is provided with a plurality of first serrations 921, and the trailing edge of each connecting blade 73 is provided with a plurality of second serrations 731. The ratio of the tooth width of the first serration 921 to the length of the leading edge of the blade 92 is in the range of 0.05-0.2, the ratio of the spacing between two adjacent first serrations 921 to the tooth width of the first serration 921 is in the range of 0-1, and the ratio of the tooth depth of the first serration 921 to the tooth width of the first serration 921 is in the range of 0.5-2. The ratio of the tooth width of the second serration 731 to the length of the trailing edge of the connecting blade 73 is in the range of 0.05-0.2, the ratio of the spacing between two adjacent second serrations 731 to the tooth width of the second serration 731 is in the range of 0-1, and the ratio of the tooth depth of the second serration 731 to the tooth width of the second serration 731 is in the range of 0.5-2. In this embodiment, there is a spacing between two adjacent first serrations 921, and there is a spacing between two adjacent second serrations 731. In other embodiments, there may be no spacing between two adjacent first serrations 921, and there may be no spacing between two adjacent second serrations 731. In this embodiment, the first serrations 921 and the second serrations 731 are generally triangular in shape. In other embodiments, the first serrations 921 and the second serrations 731 may also be trapezoidal, circular, or arcuate in shape. In this embodiment, the leading edge of the blade 92 and the trailing edge of the connecting blade 73 are provided with serrations. In other embodiments, the trailing edge of the blade 92 and the leading edge of the connecting blade 73 may also be provided with serrations. In this embodiment, the first serrations 921 are provided along the entire leading edge of the blade 92, and the second serrations 731 are provided along the entire trailing edge of the connecting blade 73. In other embodiments, the first serrations 921 may be provided only along a portion of the leading edge of the blade 92, and the second serrations 731 may be provided only along a portion of the trailing edge of the connecting blade 73.

[0038] The plurality of first serrations 921 and the plurality of second serrations 731 can effectively eliminate pressure concentration in the airflow, thereby making the overall internal pressure of the airflow more uniform, reducing turbulence, improving wind efficiency, and at the same time, reducing airflow noise.

[0039] like Figures 3 to 5 As shown, in one embodiment, the blades 92 rotate clockwise from back to front, while the connecting blades 73 rotate counterclockwise from back to front before extending straight forward. The adjacent areas of the blades 92 and connecting blades 73 extend in opposite directions. The portion of the connecting blades 73 that rotates counterclockwise from back to front can straighten and rectify the airflow generated by the rotation of the blades 92, reducing turbulence and noise.

[0040] like Figures 3 to 6 As shown, in one embodiment, the inner ring portion 72 is provided with a mounting portion 721. The motor 8 further includes a bearing seat 83, and the bearing seat 83 is mounted on the mounting portion 721. In this embodiment, the bearing seat 83 is made of metal, and the mounting portion 721 is made of plastic. The bearing seat 83 is mounted on the mounting portion 721 by one or more methods selected from in-mold injection molding, ultrasonic welding, hot melt, glue, and tight fit press-fitting. In other embodiments, the bearing seat 83 may also be made of plastic, and the bearing seat 83 is mounted on the mounting portion 721, or the bearing seat 83 and the mounting portion 721 may be integrally formed by injection molding.

[0041] like Figures 3 to 6 As shown, in one embodiment, the rotor assembly 82 includes a rotating shaft 821, a bearing assembly 822, a magnetic ring 823 and a yoke 824. The bearing assembly 822 is arranged in the bearing seat 83, and one end of the rotating shaft 821 is fixed in the bearing seat 83 through the bearing assembly 822. The magnetic ring 823 is fixed to the radial inner side of the yoke 824, and the yoke 824 is fixedly connected to the rotating shaft 821, and the yoke 824 and the magnetic ring 823 are arranged on the radial outer side of the bearing seat 83. The stator assembly 81 is arranged between the bearing seat 83 and the magnetic ring 823, and the other end of the rotating shaft 821 is fixedly connected to the fan 9. That is, the magnetic ring 823 is arranged on the radial outer side of the stator assembly 81, and the motor 8 is an outer rotor motor 8. Furthermore, the magnetic ring 823 is fixed to the radially inner side of the yoke 824, and the yoke 824 is fixedly connected to the rotating shaft 821. Therefore, when the stator assembly 81 drives the magnetic ring 823 to rotate, the magnetic ring 823 simultaneously drives the yoke 824, and the yoke 824 drives the rotating shaft 821 to rotate. Therefore, the magnetic ring 823 or the yoke 824 does not need to be connected to the fan 9. The fan 9 can be rotated by the rotating shaft 821 by being fixedly connected to the other end of the rotating shaft 821.

[0042] like Figure 4 and Figure 6 As shown, in one embodiment, the yoke 824 includes an outer wall 8241, an inner wall 8242, and a connecting wall 8243. The connecting wall 8243 connects the outer wall 8241 and the inner wall 8242. The inner wall 8242 is disposed inside the outer wall 8241 and is securely connected to the rotating shaft 821. The inner wall 8242 is shorter than the outer wall 8241 so that the bearing assembly 822 can be disposed on the portion of the rotating shaft 821 in front of the inner wall 8242. In this embodiment, the connecting wall 8243 is penetrated by a plurality of through holes 8244 to dissipate heat from the interior of the motor 8. In other embodiments, the connecting wall 8243 may not be provided with the through holes 8244.

[0043] like Figure 3 and Figure 4 In one embodiment, the bearing assembly 822 includes a first bearing 8221 located at the front, a second bearing 8222 located at the rear, and a buffer member 8223 disposed between the first bearing 8221 and the second bearing 8222. The front end of the inner side wall 8242 directly abuts the second bearing 8222, or an elastic member (unnumbered, the same below) is disposed between the front end of the inner side wall 8242 and the second bearing 8222. The buffer member 8223 may be a single spring, or may be composed of a spring and a rubber sleeve, or other elastic material. The elastic member may be a spring, or other elastic material.

[0044] like Figure 3 、 Figure 4 and Figure 6 As shown, in one embodiment, the motor 8 is a three-phase high-speed motor, and the motor 8 further includes a drive plate 84. A fixing hole 722 is defined on the inner side of the inner ring portion 72, and a fixing opening 841 is defined on the drive plate 84. The fixing member 44 passes through the fixing opening 841 and is fixed to the fixing hole 722, thereby fixing the drive plate 84 to the inner ring portion 72.

[0045] like Figures 1 to 3As shown, in one embodiment, the housing 1 includes a first section 11 and a second section 12 connected to each other, and the second section 12 is located behind the first section 11. The drive assembly is arranged in the first section 11, that is, the cylinder 7, the motor 8 and the fan 9 are arranged in the first section 11. The side of the second section 12 is surrounded by a plurality of air inlets 121, and the first section 11 discharges air. It should be understood that in this embodiment, the plurality of air inlets 121 are only arranged on the side of the second section 12, but in other embodiments, the plurality of air inlets 121 can also be arranged on the side and rear of the second section 12 at the same time. In this embodiment, a filter device 34 is also provided on the radial inner side of the plurality of air inlets 121, so that the blown air is cleaner. Of course, in other embodiments, the filter device 34 may not be provided on the radial inner side of the plurality of air inlets 121.

[0046] like Figures 1 to 3 As shown, in one embodiment, the length of the first section 11 is greater than the length of the second section 12. In other embodiments, the length of the first section 11 may also be equal to the length of the second section 12. Each of the multiple air inlets 121 is a circular hole, and the aperture size of each air inlet 121 is 0.8-2 mm. In other embodiments, each of the multiple air inlets 121 may also be a regular polygonal hole, or some of the multiple air inlets 121 may be circular holes, and some of the air inlets 121 may be regular polygonal holes.

[0047] like Figure 2 、 Figure 3 and Figure 7 As shown, in one embodiment, the air outlet component 100 further includes a support frame 2, which is accommodated in the housing 1. The support frame 2 includes a first support portion 21 and a second support portion 22 connected front and back, the first support portion 21 correspondingly accommodated in the first section 11, the second support portion 22 correspondingly accommodated in the second section 12, and the drive assembly accommodated in the first support portion 21.

[0048] like Figure 2 、 Figure 3 and Figure 7As shown, in one embodiment, a plurality of first matching portions 211 and a plurality of first guide portions 212 are provided on the outer side of the first support portion 21, and a plurality of second matching portions 111 and a plurality of second guide portions 112 are correspondingly provided on the inner side of the shell 1. The plurality of first guide portions 212 and the plurality of second guide portions 112 cooperate to guide the support frame 2 to slide into the shell 1. The plurality of first matching portions 211 and the plurality of second matching portions 111 cooperate with each other to fix the support frame 2 in the shell 1. In this embodiment, the plurality of first guide portions 212 are slide grooves, and the plurality of second guide portions 112 are sliders. In other embodiments, the plurality of first guide portions 212 may be sliders, and the plurality of second guide portions 112 may be slide grooves. The plurality of first guide portions 212 and the plurality of second guide portions 112 are not only a guiding relationship but also a positioning relationship. In this embodiment, the first mating portions 211 are hooks, and the second mating portions 111 are slots. In other embodiments, the first mating portions 211 may be slots, and the second mating portions 111 may be hooks. The first mating portions 211 and the second mating portions 111 are mated and fixed together, thereby limiting the relative position between the support frame 2 and the housing 1.

[0049] like Figure 2 、 Figure 3 and Figure 7As shown, in one embodiment, the air outlet component 100 further includes a fixing frame 3, a functional component 4, and a fixing ring 5. The diameter of the second support portion 22 is smaller than that of the first support portion 21. The second support portion 22 includes a connecting portion 221 connected to the first support portion 21, a plate portion 222 located at the rear, and a plurality of first columns 223 connecting the connecting portion 221 and the plate portion 222. The fixing frame 3 is disposed radially outward of the second support portion 22 and inside the housing 1. The fixing frame 3 includes a first ring 31, a second ring 32, and a plurality of second columns 33 connecting the first ring 31 and the second ring 32. The first ring 31 is disposed outside the connecting portion 221, and the plurality of second columns 33 are disposed outside the plurality of first columns 223. The functional component 4 is mounted on the rear side of the plate portion 222, and the second ring 32 is disposed outside the functional component 4. The fixing ring 5 includes a first sidewall 51 and a second sidewall 52 arranged concentrically, and a third sidewall 53 connecting the first sidewall 51 and the second sidewall 52. The fixing ring 5 is mounted on the rear side of the housing 1 from back to front, with the first sidewall 51 abutting and fixed against the housing 1, and the second sidewall 52 abutting and fixed against the functional component 4. The first sidewall 51, the second sidewall 52, and the third sidewall 53 are arranged around the second ring 32. With the support frame 2 fixed to the housing 1, the fixing frame 3, the functional component 4, and the fixing ring 5 are fixed to the housing 1 and the support frame 2.

[0050] like Figure 2 and Figure 3 As shown, in one embodiment, the functional component 4 is a lamp. The functional component 4 includes a light source assembly and a fixing member 44. The fixing member 44 passes through the light source assembly and is fixed to the plate portion 222 to fix the functional component 4 to the plate portion 222. The light source assembly includes a circuit board 41, an LED light-emitting component 42 and a light-transmitting component 43. The LED light-emitting component 42 is provided on the circuit board 41, and the light-transmitting component 43 is covered on the outside of the circuit board 41 and the LED light-emitting component 42. The circuit board 41 is connected to the control assembly 60, and the control assembly 60 can control the switch of the LED light-emitting component 42. Of course, in other embodiments, the functional component 4 can also be other components, such as an IP component, a humidifier, a heater, a semiconductor refrigerator, etc., and the examples are not limiting.

[0051] like Figure 2 、 Figure 7 、 Figure 8 and Figure 9As shown, in one embodiment, the air outlet component 100 further includes a first connecting member 6. The outer shell 1 includes a first opening 13 provided at the first section 11 and the second section 12, and the support frame 2 includes a second opening 23 provided at the first support portion 21 and the second support portion 22, and the second opening 23 at least partially overlaps with the first opening 13. The first connecting member 6 passes through the second opening 23 and the first opening 13 from the inner side of the support frame 2 and is exposed to the outside of the outer shell 1. The handheld part 200 further includes a second connecting member 70, which is connected to the upper side of the hand shell 10, and at least a portion of the second connecting member 70 is exposed upward and fixedly connected to the first connecting member 6.

[0052] like Figure 10 and Figure 13 As shown, in one embodiment, the first connecting member 6 is integrally formed with the support frame 2, and the housing 1 includes the first opening 13 provided in the first section 11 and the second section 12, and a portion of the first connecting member 6 is exposed downward through the first opening 13. The second connecting member 70 is integrally formed with the hand shell 10. A first vent 1021 is provided at the bottom of the hand shell 10, and a second vent 701 is provided on the second connecting member 70. When the fan 9 rotates, the main airflow path enters the air outlet component 100 from the multiple air inlets 121, and is finally blown out from the front end of the housing 1; the auxiliary airflow path flows into the hand shell 10 from the first vent 1021, and enters the air outlet component 100 through the second vent 701 and the first opening 13, and is finally blown out from the front end of the housing 1. By setting the first vent 1021 at the bottom of the hand shell 10, setting the second vent 701 on the second connecting member 70, and setting the first opening 13 on the support frame 2 to connect the hand shell 10 and the air outlet component 100, not only the air inlet area is widened and the air intake volume is increased; at the same time, the heat generated by the battery module 20 and the control component 60 can be taken away.

[0053] like Figures 11 to 13 As shown, in one embodiment, the battery module 20 includes a holder 30, a battery pack 40, and a controller 50. The holder 30 includes an upper side frame 301 and a lower side frame 302, and the upper side frame 301 and the lower side frame 302 are fixed to form a storage compartment 303. The battery pack 40 includes at least two battery cells 401, and the battery pack 40 is fixed to the storage compartment 303. The multiple battery cells 401 in the battery pack 40 are electrically connected. The positive and negative poles of the control board 501 are electrically connected to the positive and negative poles of the battery pack 40, respectively.

[0054] like Figures 11 to 13As shown, in one embodiment, the battery pack 40 includes three battery cells 401. The three battery cells 401 are arranged in an isosceles triangle. Of course, in other embodiments, the three battery cells 401 can also be arranged side by side. The model of the battery cell 401 is 18650 or 21700. In this embodiment, the three battery cells 401 are connected in series, and the operating voltage after series connection is 11.1-12.6V. The three battery cells 401 in series are directly powered by the motor 8. In other embodiments, the three battery cells 401 can also be connected in parallel, and the parallel operating voltage is 3.7-4.2V. After the three battery cells 401 are connected in parallel, the operating voltage is increased to 11.1-12.6V by a boost circuit, and then the power is supplied to the motor 8 after the boost. It should be understood that these voltage values ​​are rated values, that is, standard values, but in actual use, they will fluctuate due to constant voltage or constant current issues.

[0055] like Figures 11 to 13 As shown, in one embodiment, the upper side frame 301 includes a top wall 3011 and a plurality of first tabs 3013 extending downward from the top wall 3011. The plurality of first tabs 3013 form a plurality of first compartments 3016. The lower side frame 302 includes a bottom wall 3021 and a plurality of second tabs 3023 extending upward from the bottom wall 3021. The plurality of second tabs 3023 form a plurality of second compartments 3026. The plurality of first compartments 3016 and the plurality of second compartments 3026 together constitute the plurality of accommodating compartments 303. The plurality of first compartments 3016 accommodate a portion of the plurality of battery cells 401, and the plurality of second compartments 3026 accommodate another portion of the plurality of battery cells 401. A plurality of first fixing parts 3015 are provided on the periphery of the plurality of first contact pieces 3013, a plurality of second fixing parts 3025 are provided on the periphery of the plurality of second contact pieces 3023, the upper side frame 301 and the lower side frame 302 are correspondingly merged, and the plurality of first fixing parts 3015 and the plurality of second fixing parts 3025 are correspondingly fixed to each other so as to fix the plurality of battery cells 401 in the plurality of accommodating compartments 303.

[0056] like Figures 11 to 13As shown, in one embodiment, the positive pole of each battery cell 401 is oriented in the same direction as the negative pole of the adjacent battery cell 401, and the positive and negative poles of two adjacent battery cells 401 are connected in series via a conductive member 402. Alternatively, in other embodiments, the positive poles of multiple battery cells 401 are oriented in the same direction, the positive poles of two adjacent battery cells 401 are connected in parallel via a conductive member 402, and the negative poles of two adjacent battery cells 401 are connected in parallel via a conductive member 402. The top wall 3011 is provided with a plurality of first slots 3012, and the bottom wall 3021 is provided with a plurality of second slots 3022. The plurality of conductive members 402 are provided in the plurality of first slots 3012 and the plurality of second slots 3022.

[0057] like Figures 11 to 13 As shown, in one embodiment, the controller 50 is disposed above the top wall 3011. The positive electrode of the battery pack 40 is electrically connected to the positive electrode of the control board 501 via the positive electrode connector 403, and the negative electrode of the battery pack 40 is electrically connected to the negative electrode connector 404 of the control board 501. The first connector 3013 defines a plurality of third slots 3014, and the second connector 3023 defines a plurality of fourth slots 3024. The plurality of third slots 3014 and the plurality of fourth slots 3024 are connected in a one-to-one correspondence. The positive electrode connector 403 or the negative electrode connector 404 passes through one of the second slots 3022, one of the fourth slots 3024, and one of the third slots 3014, and then is electrically connected to the negative or positive electrode of the control board 501. It should be understood that the plurality of first connectors 3013 and the plurality of second connectors 3023 are generally arc-shaped, thereby securing and retaining the plurality of battery cells 401. The remaining third slots 3014 and the remaining fourth slots 3024 may be used to ventilate and dissipate heat within the battery pack 40 .

[0058] like Figure 1 、 Figures 11 to 13 As shown, in one embodiment, the length of the handheld portion 200 is 52-62 mm, the width of the handheld portion 200 is 25.5-35.5 mm, the height of the handheld portion 200 is 96.6-106.6 mm, and a portion of each of the battery cells 401 is arranged tangent to the handheld portion 200. The overall volume of the handheld portion 200 is small, and the handheld portion 200 is easy for the user to hold.

[0059] like Figures 11 to 13 As shown, in one embodiment, the handheld portion 200 includes a side cover 101 and a bottom cover 102, that is, the hand shell 10 includes a side cover 101 and a bottom cover 102. The bottom cover 102 is detachably connected to the side cover 101, and the bottom cover 102 is provided with the first vent 1021.

[0060] The above detailed description is only an illustration of the preferred embodiment of the present application, and does not limit the patent scope of the present application. Therefore, all equivalent technical changes made by using the description and illustrations of this invention are included in the patent scope of this invention.

Claims

1. A drive assembly, characterized in that: include: The cylinder comprises an outer ring portion, an inner ring portion, and a plurality of connecting leaves connecting the outer ring portion and the inner ring portion; a fan housed in the outer ring portion and disposed at the rear side of the inner ring portion, the fan comprising a hub and a plurality of blades spaced and arranged around the hub; A motor, comprising a stator assembly and a rotor assembly, wherein the outer diameter of the motor is smaller than the inner diameter of the inner ring portion, and the motor is mounted inside the inner ring portion; Wherein, the rear end of the fan extends backward beyond the rear end of the outer ring portion.

2. The drive assembly according to claim 1, wherein: The outer diameter of the motor is smaller than the maximum inner diameter of the hub; the leading edge of each blade is provided with a plurality of first serrations, and the trailing edge of each connecting blade is provided with a plurality of second serrations.

3. The drive assembly according to claim 2, wherein: The ratio of the tooth width of the first sawtooth to the length of the leading edge of the blade is in the range of 0.05-0.2, the ratio of the spacing between two adjacent first sawteeth to the tooth width of the first sawtooth is in the range of 0-1, and the ratio of the tooth depth of the first sawtooth to the tooth width of the first sawtooth is in the range of 0.5-2; the ratio of the tooth width of the second sawtooth to the length of the trailing edge of the connecting leaf is in the range of 0.05-0.2, the ratio of the spacing between two adjacent second sawteeth to the tooth width of the second sawtooth is in the range of 0-1, and the ratio of the tooth depth of the second sawtooth to the tooth width of the second sawtooth is in the range of 0.5-2.

4. The drive assembly according to claim 1, wherein: The hub radially increases from back to front, the inner ring portion radially remains unchanged from back to front, and the maximum diameter of the hub differs from the diameter of the inner ring portion by less than 2 mm; the blades rotate clockwise from back to front, and the connecting leaves first rotate counterclockwise from back to front and then extend straight forward.

5. The drive assembly according to claim 1, wherein: A mounting portion is provided in the inner ring portion, and the motor further comprises a bearing seat, wherein the bearing seat is mounted on the mounting portion.

6. The drive assembly according to claim 5, wherein: The bearing seat is made of metal, and the mounting portion is made of plastic. The bearing seat is fixedly connected to the mounting portion by one or more methods including in-mold injection molding, ultrasonic welding, hot melt, glue, and tight fit press-in.

7. The drive assembly according to claim 5, wherein: The rotor assembly includes a rotating shaft, a bearing assembly, a magnetic ring and a yoke. The bearing assembly is arranged in the bearing seat. One end of the rotating shaft is fixed in the bearing seat through the bearing assembly. The magnetic ring is fixed to the radial inner side of the yoke. The yoke is fixedly connected to the rotating shaft, and the yoke and the magnetic ring are arranged on the radial outer side of the bearing seat; the stator assembly is arranged between the bearing seat and the magnetic ring, and the other end of the rotating shaft is fixedly connected to the fan.

8. The drive assembly according to claim 7, wherein: The yoke includes an outer wall, an inner wall and a connecting wall, wherein the connecting wall connects the outer wall and the inner wall, the inner wall is arranged on the inner side of the outer wall, the inner wall is fastened to the rotating shaft, and a plurality of through holes are formed through the connecting wall.

9. The drive assembly according to claim 8, wherein: The bearing assembly includes a first bearing located in the front, a second bearing located in the rear, and a buffer member arranged between the first bearing and the second bearing. The front end of the inner wall directly abuts the second bearing, or an elastic member is arranged between the front end of the inner wall and the second bearing.

10. The drive assembly according to claim 1, wherein: The motor is a three-phase high-speed motor, and the motor further includes a drive plate. A fixing hole is provided on the inner side of the inner ring portion, and the drive plate is provided with a fixing opening. A fixing member passes through the fixing opening and is fixed to the fixing hole.

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