Fan and floor scrubber

Abstract

The present invention discloses a fan and also discloses a floor scrubber with the fan. The fan includes a shell assembly, a stator assembly and a rotor assembly. The shell assembly includes an outer shell and a casing. The outer shell is sleeved in the casing. An air outlet channel is formed between the outer shell and the casing. The stator assembly is installed in the casing. The rotor assembly is rotatably connected to the stator assembly. The rotating shaft of the rotor assembly is fixedly connected to an impeller. The outer wall of the casing is provided with fins, and at least part of the fins is located in the air outlet channel. The fins have a resistance effect on the airflow in the air outlet channel, which can extend the time for the airflow to pass through the fins, thereby extending the heat exchange time between the fins and the airflow. The airflow can absorb more heat and enhance the heat dissipation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a fan and a floor scrubber. Background Art

[0002] A floor scrubber is a cleaning device that combines sweeping, mopping and washing. It can be used in dry and wet environments to clean dry and wet garbage.

[0003] In the related technology, the floor scrubber has certain requirements for the suction performance. The suction force of the floor scrubber is provided by the fan, which requires a high speed of the fan, resulting in a large amount of heat generated by the stator assembly of the fan. In addition, the floor scrubber is used in dry and wet environments, and there are certain waterproof requirements for the fan, requiring the fan structure to be airtight. When the fan is well-sealed, the heat of the stator assembly cannot be dissipated in time, resulting in poor heat dissipation effect of the fan. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fan that can enhance the heat dissipation effect.

[0005] The present invention also provides a floor scrubber having the above-mentioned blower.

[0006] A wind turbine according to a first embodiment of the present invention includes:

[0007] The housing assembly comprises an outer shell and a casing, wherein the outer shell is sleeved on the casing, and an air outlet channel is formed between the outer shell and the casing;

[0008] a stator assembly, mounted in the housing;

[0009] a rotor assembly, rotatably connected to the stator assembly, wherein the rotating shaft of the stator assembly is fixedly connected to an impeller;

[0010] Wherein, the outer wall of the casing is provided with fins, and at least a part of the structure of the fins is located in the air outlet channel.

[0011] The fan according to the embodiment of the first aspect of the present invention has at least the following beneficial effects: the rotating shaft of the rotor assembly drives the impeller to rotate, the impeller inhales the airflow, the airflow flows out from the air outlet side of the impeller, the airflow gains kinetic energy, the airflow can enter the air outlet channel, the heat generated by the stator assembly is conducted to the casing, and the heat of the casing is conducted to the fins. Since part of the fins is located in the air outlet channel, the airflow in the air outlet channel will pass through the fins, and the fins have a resistance effect on the airflow in the air outlet channel, which can extend the time the airflow passes through the fins, thereby increasing the heat exchange time between the airflow and the fins. The airflow in the air outlet channel can be effectively utilized to absorb more heat, thereby enhancing the heat dissipation effect.

[0012] According to some embodiments of the present invention, a plurality of fins are provided, and the plurality of fins are arranged along the circumference of the casing.

[0013] According to some embodiments of the present invention, the distance from the edge of the fin to the housing gradually increases in a direction toward the air inlet end of the air outlet channel.

[0014] According to some embodiments of the present invention, the fan includes a diffuser, which is installed in the casing. The diffuser is provided with a plurality of diffuser blades, and a diffuser channel is formed between two adjacent diffuser blades. The diffuser channel is located between the impeller and the air outlet channel.

[0015] According to some embodiments of the present invention, the number M of the fins is greater than or equal to 3 and less than or equal to 17, and the number N of the diffuser blades is greater than or equal to 4 and less than or equal to 10.

[0016] According to some embodiments of the present invention, the maximum thickness W of the fin is greater than or equal to 0.2 mm and less than or equal to 5 mm.

[0017] According to some embodiments of the present invention, a portion of the housing is concave inward to form an arc-shaped surface, and the arc-shaped surface is used to guide the airflow in the air outlet channel to flow along the surface of the housing.

[0018] According to some embodiments of the present invention, the fins are provided on the arc-shaped surface.

[0019] According to some embodiments of the present invention, the housing is made of aluminum alloy.

[0020] According to some embodiments of the present invention, the surface of the housing is processed by at least one of electroplating, anodizing and passivation.

[0021] According to some embodiments of the present invention, the fan includes a wind cover, which is connected to the housing assembly, the wind cover is arranged to cover the impeller, and the wind cover is provided with an air inlet.

[0022] A floor scrubber according to a second embodiment of the present invention includes the fan according to the first embodiment.

[0023] The floor scrubber according to the embodiment of the present invention has at least the following beneficial effects: the fan applied to the embodiment of the first aspect, the rotating shaft of the rotor assembly drives the impeller to rotate, the impeller inhales the airflow, the airflow flows out from the air outlet side of the impeller, the airflow obtains kinetic energy, the airflow can enter the air outlet channel, the heat generated by the stator assembly is conducted to the casing, and the heat of the casing is conducted to the fins. Since part of the fins is located in the air outlet channel, the airflow in the air outlet channel will pass through the fins, and the fins have a resistance effect on the airflow in the air outlet channel, which can extend the time the airflow passes through the fins, thereby increasing the heat exchange time between the airflow and the fins. The airflow in the air outlet channel can be effectively utilized to absorb more heat, thereby enhancing the heat dissipation effect.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0026] Figure 1 A cross-sectional view of a fan according to an embodiment of the first aspect of the present invention;

[0027] Figure 2 A schematic structural diagram of a casing according to some embodiments of the present invention;

[0028] Figure 3 for Figure 2 An enlarged view of A shown in FIG;

[0029] Figure 4 A top view of a housing according to some embodiments of the present invention;

[0030] Figure 5 for Figure 4 An enlarged view of B shown in FIG;

[0031] Figure 6 Schematic diagram of the structure of the stator assembly of some embodiments of the present invention;

[0032] Figure 7 Schematic diagram of the structure of the casing of some embodiments of the present invention;

[0033] Figure 8 for Figure 7 An enlarged view of C shown in FIG;

[0034] Figure 9 Schematic diagram of the structure of a fan in some embodiments of the present invention;

[0035] Figure 10 A schematic structural diagram of a housing in some embodiments of the present invention;

[0036] Figure 11 Graph showing the relationship between the number of fins and the average temperature of the windings in a fan according to some embodiments of the present invention.

[0037] Reference numerals:

[0038] Fan 1000;

[0039] Housing 100, air outlet channel 110;

[0040] Casing 200, guide ribs 210, curved surface 211, heat dissipation ribs 220, curved surface 230, first curved surface 231, second curved surface 232, fins 240, beveled edges 241, ventilation slots 250, annular inner wall 260, first housing section 270, second housing section 280;

[0041] stator assembly 300, stator core 310, winding 320;

[0042] Rotor assembly 400, shaft 410, impeller 411;

[0043] Diffuser 500, diffuser blades 510;

[0044] Air hood 600, air inlet 610, impeller chamber 620;

[0045] End cap 700;

[0046] Circuit substrate 800. DETAILED DESCRIPTION

[0047] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0048] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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, they cannot be understood as limitations on the present invention.

[0049] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0050] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0051] A floor scrubber is a cleaning device that combines sweeping, mopping, and washing. It can be used in both dry and wet environments to remove both wet and dry debris. It includes a suction fan and a roller brush fan. The suction fan drives the impeller to generate suction, while the roller brush fan drives the roller brush to wipe the floor.

[0052] In the related art, floor scrubbers are usually provided with a hood for protection. For fans used for air suction, the fan's rotor assembly drives the impeller to rotate, forming a large vacuum at the entrance of the hood, and the airflow is sucked in from the entrance of the hood. Floor scrubbers require a large suction force and a high rotation speed of the fan. When the rotation speed is high, the stator assembly of the fan generates a large amount of heat. In addition, floor scrubbers are used in dry and wet environments, and there are certain waterproof requirements for the fan. The fan structure is required to have good airtightness. For example, the airflow inhaled by the fan is difficult to enter the interior of the fan, that is, the airflow inhaled by the fan is difficult to flow through the stator assembly and dissipate heat. When the fan is well-sealed, the heat of the stator assembly accumulates inside the casing and cannot be dissipated in time, which will cause the fan to overheat and be damaged. At present, there is room for improvement in the fan of floor scrubbers.

[0053] It needs to be explained that the stator assembly usually includes a stator core and windings. The stator core is cylindrical with open ends. The windings are wound inside the stator core and usually protrude to the axial ends of the stator core. The main function of the windings is to conduct current and thus generate induced electromotive force to realize the conversion of electromechanical energy. During the operation of the fan, the current passes through the windings and the windings will generate heat. Since the stator assembly is installed inside the casing and the casing is well sealed, the heat dissipation conditions inside the casing are poor.

[0054] In the related art, if the stator assembly is directly connected to the inner wall of the casing through interference fit, due to the large contact area between the stator assembly and the inner wall of the casing, a very large interference fit force is required when press-fitting the stator assembly. Existing press-fitting equipment is unable to meet such a large interference fit force requirement. Moreover, the stator assembly is difficult to remove after press-fitting. Currently, most wind turbines usually have a stator mounting portion installed in the casing. The stator assembly and the stator mounting portion are connected by bolts. The stator assembly does not have a close contact with the inner wall of the casing, making it difficult for the heat of the stator assembly to be transferred to the casing.

[0055] Based on this, refer to Figure 1As shown, the wind turbine 1000 according to the first embodiment of the present invention includes a housing assembly, a stator assembly 300 and a rotor assembly 400 .

[0056] Reference Figure 1 、 Figure 2 、 Figure 9 and Figure 10 As shown, specifically, the housing assembly includes an outer shell 100 and a housing 200. The outer shell 100 is annular in structure, having a cavity therein. The outer shell 100 is open at both ends along the axial direction. The housing 200 is a roughly cylindrical structure. The housing 200 is installed in the cavity of the outer shell 100, with one end of the housing 200 extending into the cavity of the outer shell 100. The outer shell 100 is sleeved on the housing 200. The outer shell 100 is located outside and surrounds the housing 200. The inner circumferential wall of the outer shell 100 and the outer circumferential wall of the housing 200 define an annular air outlet channel 110. It should be noted that part of the housing 200 is located within the air outlet channel 110, while part of the housing 200 is located outside the air outlet channel 110. The airflow in the air outlet channel 110 can flow along the surface of the housing 200.

[0057] More specifically, the housing 200 defines a mounting cavity, and the stator assembly 300 is mounted within the mounting cavity of the housing 200. A stator mounting portion may be provided within the mounting cavity of the housing 200, and the stator assembly 300 and the stator mounting portion may be bolted together, or the stator assembly 300 and the mounting cavity of the housing 200 may be secured together with adhesive. The rotor assembly 400 is rotatably coupled to the stator assembly 300. Specifically, the rotating shaft 410 of the rotor assembly 400 is located within the stator core 310 of the stator assembly 300, with a gap between the rotating shaft 410 and the stator core 310, allowing the rotating shaft 410 to rotate relative to the stator core 310. The rotating shaft 410 is arranged along the axial direction of the casing 200, and the end of the rotating shaft 410 extends out of the bottom of the casing 200. At the same time, the end of the rotating shaft 410 also extends out of the bottom of the outer shell 100. The end of the rotating shaft 410 is fixedly connected to the impeller 411. The rotating shaft 410 can drive the impeller 411 to rotate. The impeller 411 is located below the air outlet channel 110.

[0058] To ensure better sealing, the fan 1000 also includes a hood 600 and an end cover 700. The hood 600 is mounted on the bottom of the housing 100. A sealing ring can be provided between the inner circumferential wall of the hood 600 and the outer circumferential wall of the housing 100 to form a sealed connection. An impeller cavity 620 is provided within the hood 600. The impeller cavity 620 is connected to the air outlet channel 110. The impeller 411 is located within the impeller cavity 620. The hood 600 covers the impeller 411. An air inlet 610 is provided at the bottom of the hood 600. The end cover 700 is mounted on the top of the casing 200. The end cover 700 covers the installation cavity of the casing 200 to ensure good sealing.

[0059] Reference Figure 2 and Figure 3 As shown, a heat dissipation rib 220 is provided in the casing 200. Specifically, the casing 200 includes an annular inner wall 260, which can be formed by the inner circumferential wall of the casing 200. The heat dissipation rib 220 is provided on the annular inner wall 260. The heat dissipation rib 220 is located between the casing 200 and the stator assembly 300. The heat dissipation rib 220 abuts against the stator assembly 300. The heat dissipation rib 220 fits the outer wall of the stator assembly 300. The mating surface between the heat dissipation rib 220 and the stator assembly 300 is arc-shaped, so that the heat dissipation rib 220 can conduct the heat of the stator assembly 300 to the casing 200. It can be understood that the heat dissipation rib 220 can be integrally formed with the casing 200 for easy manufacturing.

[0060] When the fan 1000 is working, the rotor assembly 400 drives the impeller 411 to rotate, and the impeller 411 inhales airflow, forming a large vacuum at the air inlet 610 of the wind cover 600. The airflow is inhaled into the air inlet 610 of the wind cover 600, and the airflow flows out from the air outlet side of the impeller 411. The airflow is squeezed and obtains greater kinetic energy, thereby entering the air outlet channel 110. At the same time, the heat dissipation ribs 220 conduct the heat of the stator assembly 300 to the casing 200. The airflow in the air outlet channel 110 can flow through the surface of the casing 200 and take away the heat of the casing 200. When the fan 1000 has good sealing performance, the heat dissipation effect of the fan 1000 is enhanced, and the heat accumulation of the stator assembly 300 and the inability to dissipate it in time are reduced.

[0061] It is understandable that the mating surface between the heat dissipating rib 220 and the stator assembly 300 may also be an irregular shape. By increasing the area of ​​the mating surface between the heat dissipating rib 220 and the stator assembly 300, the heat conduction area between the heat dissipating rib 220 and the stator assembly 300 can be increased, so that the heat dissipating rib 220 can conduct more heat and further enhance the heat conduction effect of the heat dissipating rib 220.

[0062] Reference Figure 2 and Figure 4 As shown, it can be understood that there can be multiple heat dissipation ribs 220, and multiple heat dissipation ribs 220 are arranged at intervals along the circumference of the casing 200. Arranging multiple heat dissipation ribs 220 can increase the contact area with the stator assembly 300, thereby enhancing the thermal conductivity effect of the heat dissipation ribs 220. For example, there are three heat dissipation ribs 220, and the three heat dissipation ribs 220 are arranged at an interval of 120 degrees from each other, so that the heat conduction is more uniform and the thermal conductivity effect is better.

[0063] Reference Figures 1 to 4As shown, it is understood that the housing 200 is provided with guide ribs 210. Specifically, the guide ribs 210 are provided on the annular inner wall 260 of the housing 200. The guide ribs 210 are convex structures, and the guide ribs 210 can guide the stator assembly 300 into the housing 200. Specifically, the stator assembly 300 and the guide ribs 210 have an interference fit, and the mating surface between the guide ribs 210 and the stator assembly 300 is an arcuate surface 211. The stator assembly 300 presses against the guide ribs 210, and the stator assembly 300 can be tightly fitted with the guide ribs 210, so that the guide ribs 210 can conduct heat generated by the stator assembly 300 to the outer wall of the housing 200, thereby enhancing the heat dissipation effect. It is understood that the guide ribs 210 can be integrally formed with the housing 200 to facilitate manufacturing.

[0064] It is understandable that the mating surface between the guide rib 210 and the stator assembly 300 may also be an irregular shape. The area of ​​the mating surface between the guide rib 210 and the stator assembly 300 can be increased to ensure that the stator assembly 300 is tightly fitted with the guide rib 210 after being pressed in. At the same time, the heat conduction area between the guide rib 210 and the stator assembly 300 can also be increased to enhance the heat dissipation effect.

[0065] Reference Figure 3 and Figure 4 As shown, it can be understood that a plurality of guide ribs 210 can be provided, and the plurality of guide ribs 210 are spaced apart along the circumference of the housing 200. For example, three guide ribs 210 are spaced apart at 120 degrees from each other. Providing multiple guide ribs 210 can increase the contact area between the stator assembly 300 and the guide ribs 210, thereby enhancing the heat conduction effect of the guide ribs 210 and taking away more heat. At the same time, it can also fix the press-fit angle of the stator assembly 300, facilitating the subsequent assembly of the stator assembly 300 and the end cover 700. The plurality of guide ribs 210 can also be spaced apart at equal intervals along the circumference of the housing 200. For example, three guide ribs 210 can be provided, and the three guide ribs 210 are spaced apart at 120 degrees from each other. While ensuring that the stator assembly 300 and the guide ribs 210 are firmly fitted together, the heat dissipation effect is better. It can be understood that when there are multiple guide ribs 210, there are also multiple arcuate surfaces 211 of the guide rib 210. The multiple arcuate surfaces 211 are arranged at circumferential intervals of the housing 200, and a reference circle is formed between the multiple arcuate surfaces 211, and the reference circle has a diameter length.

[0066] Reference Figure 3 、 Figure 5 and Figure 6As shown, for the above-mentioned embodiment, based on extensive experimental data, the present embodiment defines the following: the interference fit X between the stator assembly 300 and the guide rib 210 is equal to half the difference between the outer diameter D of the stator assembly 300 and the diameter K1 of the reference circle formed by the plurality of arcuate surfaces 211, X is greater than or equal to 0.005 mm, and X is less than or equal to 0.5 mm. The diameter K1 of the reference circle is determined by the thickness of the guide rib 210. When these conditions are met, the pressing force between the stator assembly 300 and the guide rib 210 is moderate, achieving both a tight fit and thermal conductivity. If X is less than 0.005 mm, the pressing force between the stator assembly 300 and the guide rib 210 is too low, causing the stator assembly 300 to easily become loose. Furthermore, the stator assembly 300 and the guide rib 210 do not fit tightly enough, resulting in poor thermal conductivity. If X is greater than 0.5 mm, the pressing force between the stator assembly 300 and the guide rib 210 is too large. During press-fitting, the stator assembly 300 requires too much interference fit, which is not conducive to assembly. In addition, the excessive pressing force between the stator assembly 300 and the guide rib 210 may damage the structures of the stator assembly 300 and the guide rib 210.

[0067] Furthermore, with respect to the above-described embodiment, the present invention provides that the interference fit force F of the stator assembly 300 is less than or equal to 6000 N. When this condition is met, the pressing force between the stator assembly 300 and the guide rib 210 can be kept low during press-fitting of the stator assembly 300, thereby reducing the risk of structural damage. However, if the interference fit force F exceeds 6000 N, it may cause significant damage to the stator assembly 300 and the guide rib 210, such as causing defects such as cracks in the guide rib 210.

[0068] Reference Figure 2 and Figure 4 As shown, it is understood that multiple heat dissipation ribs 220 and guide ribs 210 can be provided. The heat dissipation ribs 220 and guide ribs 210 are spaced and alternately arranged along the circumference of the housing 200, so that heat conduction of the stator assembly 300 is more uniform and the compressive force on the stator assembly 300 is more balanced. For example, three guide ribs 210 and three heat dissipation ribs 220 are provided, and the three guide ribs 210 are spaced 120 degrees along the circumference of the housing 200. The three heat dissipation ribs 220 are also spaced 120 degrees along the circumference of the housing 200, and the heat dissipation ribs 220 are located between two guide ribs 210.

[0069] It can be understood that the heat dissipation rib 220 can be transitionally fitted with the stator assembly 300. For example, when the heat dissipation rib 220 and the stator assembly 300 are clearance-fitted, the heat dissipation rib 220 dissipates heat for the stator assembly 300. When the heat dissipation rib 220 and the stator assembly 300 are interference-fitted, the interference between the heat dissipation rib 220 and the stator assembly 300 can be set to be smaller than the interference between the guide rib 210 and the stator assembly 300, so that the heat dissipation rib 220 can not only dissipate heat but also assist in positioning and assembling the stator assembly 300.

[0070] In the case of interference fit between the heat dissipation rib 220 and the stator assembly 300, if the area of ​​the mating surface between the heat dissipation rib 220 and the stator assembly 300 is too large, the stator assembly 300 requires a large interference press force, which will affect the assembly of the stator assembly 300 in the housing 200. Based on this, refer to Figure 3 and Figure 5 As shown, based on a large amount of experimental data, embodiments of the present invention stipulate that: the sum of the arc length L of the heat dissipating rib 220 and the height H of the heat dissipating rib 220 is less than or equal to the inner diameter K2 of the annular inner wall 260. It should be noted that the inner diameter of the annular inner wall 260 of this embodiment remains constant within a certain range along the axial direction, and the inner diameter K2 of the annular inner wall 260 does not take into account the thickness of the heat dissipating rib 220. When the above conditions are met, a good heat dissipation effect can be achieved while the interference fit force of the stator assembly 300 is relatively small, and the assembly of the stator assembly 300 and the housing 200 is not affected. If L + H is greater than K2, the pressing force between the heat dissipating rib 220 and the stator assembly 300 will be too large, requiring a large interference fit force during press-fitting, which is not conducive to the assembly of the stator assembly 300.

[0071] The stator core 310 of the stator assembly 300 is provided with stator slots for winding windings 320. The number of stator slots is equal to the number of windings 320. The number of slots in the stator assembly 300 is the same as the number of stator slots. The operating performance of the wind turbine 1000 is related to the number of slots in the stator assembly 300. Under different operating conditions, the wind turbine 1000 needs to meet different operating performance requirements. Based on this, the embodiment of the present invention stipulates that the ratio of the outer diameter D of the stator assembly 300 to the number of slots N of the stator assembly 300 is greater than or equal to 1.25, and the ratio of the outer diameter D of the stator assembly 300 to the number of slots N of the stator assembly 300 is less than or equal to 20. It should be noted that the ratio of the outer diameter D of the stator assembly 300 to the number of slots N of the stator assembly 300 is the outer diameter D of the stator assembly 300 divided by the number of slots N of the stator assembly 300, with the outer diameter D of the stator assembly 300 as the numerator and the number of slots N of the stator assembly 300 as the denominator. When the above conditions are met, the fan 1000 can be widely used in most environments and has strong applicability.

[0072] Reference Figure 1 and Figure 7As shown, it can be understood that the housing 200 includes a first housing section 270 and a second housing section 280 arranged vertically. The first housing section 270 is located below the second housing section 280. The outer diameter of the second housing section 280 is smaller than that of the first housing section 270. The air outlet duct 110 is located between the second housing section 280 and the outer shell 100. A portion of the outer peripheral wall of the housing 200 is recessed inward to form a curved surface 230. In the region of the curved surface 230, the outer diameter of the housing 200 gradually decreases toward the bottom of the housing 200. The curved surface 230 connects the first housing section 270 and the second housing section 280, ensuring a smooth transition from the first housing section 270 to the second housing section 280 and a uniform wall thickness for the housing 200. During manufacturing, this embodiment can reduce defects caused by stress concentration. Furthermore, the large area of ​​the curved surface 230 can enhance the thermal conductivity of the housing 200.

[0073] In the case where the outer peripheral wall of the housing 200 is arranged in a vertical direction, the direction of the airflow in the air outlet duct 110 is parallel to the direction in which the outer peripheral wall of the housing 200 is arranged. The windward surface area of ​​the outer peripheral wall of the housing 200 is small, and the airflow can remove less heat, resulting in poor heat dissipation. In this embodiment, the airflow in the air outlet duct 110 can collide with the curved surface 230. The curved surface 230 can increase the windward area of ​​the housing 200, allowing the airflow to remove more heat. At the same time, the airflow flows along the curved surface 230 with less resistance, ensuring good ventilation of the air outlet duct 110 and taking into account both the heat dissipation performance and air intake performance of the fan 1000.

[0074] Reference Figure 1 As shown, specifically, the arcuate surface 230 includes a first curved surface 231 and a second curved surface 232. The second curved surface 232 is more concave inward than the first curved surface 231. The first curved surface 231 is connected to the first housing 270. The first curved surface 231 is located above the air outlet duct 110. The first curved surface 231 is connected to the second curved surface 232. The second curved surface 232 is connected to the second housing 280. Part of the second curved surface 232 is located within the air outlet duct 110. In the solution where a right-angle transition surface is provided to connect the first housing 270 and the second housing 280, the airflow will be subject to significant resistance, resulting in poor ventilation of the air outlet duct 110, thereby affecting the air suction performance of the fan 1000. The first curved surface 231 and the second curved surface 232 of this embodiment can guide the airflow in the air outlet channel 110. The airflow in the air outlet channel 110 flows along the surfaces of the first shell 270, the first curved surface 231, the second curved surface 232 and the second shell 280 in sequence. The airflow flows smoothly and the resistance to the airflow can be reduced, so that the air suction performance of the fan 1000 is better.

[0075] It can be understood that, for the above-mentioned embodiment, the position of the guide rib 210 is set corresponding to the arc surface 230 of the casing 200. The guide rib 210 directly conducts the heat of the stator assembly 300 to the arc surface 230, which can reduce the distance of heat conduction, make the heat conduction faster, and further enhance the heat dissipation effect.

[0076] Reference Figure 1 、 Figure 7 and Figure 8 As shown, it can be understood that the outer wall of the casing 200 is provided with fins 240, and the fins 240 are integrally formed with the casing 200. The fins 240 are in a raised sheet-like structure. The fins 240 can be arranged at the outlet of the air outlet channel 110, and the structure of the fin 240 part can extend into the air outlet channel 110. The extension direction of the fins 240 can be the same as the flow direction of the airflow in the air outlet channel 110. The fins 240 can extend in the vertical direction. The fins 240 have a resistance effect on the airflow, which can slow down the flow speed of the airflow, thereby extending the time for the airflow to pass through the fins 240, so that the airflow can fully exchange heat with the fins 240, and the airflow can also fully exchange heat with the casing 200, thereby making full use of the airflow in the air outlet channel 110 to take away the heat of the casing 200 to enhance the heat dissipation effect. In addition, since the fins 240 are connected to the housing 200 , the housing 200 can also conduct heat to the fins 240 . Since the fins 240 are in a sheet shape, the heat conduction area can be increased, thereby achieving a better heat dissipation effect on the housing 200 .

[0077] Reference Figure 1 As shown, it can be understood that the distance from the edge of the fin 240 to the housing 100 gradually increases in the direction toward the air inlet end of the air outlet channel 110. When the housing 100 is a rotating body, the distance from the edge of the fin 240 to the housing 100 can be understood as the distance from the edge of the fin 240 to the generatrix of the housing 100. This forms a beveled edge 241 at the edge of the fin 240. The beveled edge 241 extends in a straight line, resulting in a smaller area of ​​the fin 240. This appropriately reduces the resistance of the fin 240 to the airflow in the air outlet channel 110, thereby ensuring good ventilation of the air outlet channel 110 and ensuring the air suction performance of the fan 1000. It can be understood that the beveled edge 241 can also extend in an arc direction.

[0078] The thickness of the fin 240 has a certain influence on the resistance of the airflow in the air outlet channel 110. Based on a large amount of experimental data, the embodiment of the present invention stipulates that: the maximum thickness W of the fin 240 is greater than or equal to 0.2 mm, and the maximum thickness W of the fin 240 is less than or equal to 5 mm. It should be noted that the thickness of the fin 240 of this embodiment is uniform, and the thickness of each position of the fin 240 is the same. When the above conditions are met, the resistance of the fin 240 to the airflow in the air outlet channel 110 is moderate, so that the ventilation of the air outlet channel 110 is better, and the effect of extending the time for the airflow to pass through the fin 240 is also better. The fin 240 can take into account the air suction performance and heat dissipation performance of the fan 1000. If the maximum thickness W of the fin 240 is less than 0.2 mm, the resistance of the fin 240 to the airflow in the air outlet channel 110 is small, and the effect of extending the time for the airflow to pass through the fin 240 is poor. If the maximum thickness W of the fin 240 is greater than 5 mm, the fin 240 will have a greater resistance to the airflow in the air outlet channel 110 , which is not conducive to ventilation of the air outlet channel 110 and will affect the air suction performance of the fan 1000 .

[0079] Reference Figure 1 and Figure 7 As shown, it can be understood that the fin 240 is arranged at the arc-shaped surface 230, and the fin 240 is connected to the arc-shaped surface 230. A plurality of fins 240 can be provided, and a plurality of fins 240 are arranged along the circumference of the arc-shaped surface 230. The arc-shaped surface 230 can guide the airflow to flow along the arc-shaped surface 230, thereby reducing the resistance to the airflow. The fin 240 can fully utilize the airflow to achieve heat exchange and take away the heat of the casing. The combination of the fin 240 and the arc-shaped surface 230 can ensure that the heat dissipation is enhanced when the fluidity of the airflow is good, while taking into account the air suction performance and the heat dissipation performance.

[0080] Reference Figure 1 and Figure 7 As shown, for the above embodiment, it can be understood that the positions of the stator assembly 300, the arc-shaped surface 230 and the fins 240 are correspondingly arranged, so that the distance between the stator assembly 300, the arc-shaped surface 230 and the fins 240 is small, which can reduce the distance of heat transfer and make the heat conduction faster. The heat of the stator assembly 300 can be conducted to the outside of the casing 200 more quickly, and the airflow of the air outlet channel 110 takes away the heat, which can further enhance the heat dissipation effect.

[0081] Reference Figure 1 and Figure 7As shown, it can be understood that there are multiple fins 240, and the multiple fins 240 are spaced apart along the outer peripheral wall of the casing 200. The multiple fins 240 can also be spaced apart at equal intervals along the outer peripheral wall of the casing 200. The provision of multiple fins 240 can increase the resistance of the fins 240 to the airflow of the air outlet channel 110, further extend the time for the airflow of the air outlet channel 110 to pass through the fins 240, and achieve the effect of sufficient heat exchange. In addition, the multiple fins 240 can increase the heat conduction area, and the casing 200 can conduct more heat to the fins 240, further enhancing the heat dissipation effect.

[0082] Reference Figure 1 and Figure 10 As shown, it can be understood that a diffuser 500 is provided between the impeller 411 and the air outlet channel 110. The diffuser 500 is installed at the bottom of the casing 200. The diffuser 500 is located in the cavity of the outer shell 100. The diffuser 500 can convert the kinetic energy of the airflow into air pressure energy, reduce the flow rate of the airflow to increase the pressure. Specifically, the diffuser 500 includes diffuser blades 510. The diffuser blades 510 are arranged at an angle. There are multiple diffuser blades 510. The diffuser blades 510 are arranged at intervals along the circumference of the outer shell 100. The diffuser blades 510 are located in the annular area at the bottom of the outer shell 100. A diffuser channel is formed between two adjacent diffuser blades 510. The airflow flows out from the air outlet side of the impeller 411, obtains kinetic energy, and then enters the diffuser channel. The diffuser channel converts the kinetic energy of the airflow into air pressure energy, thereby achieving deceleration and pressurization of the airflow.

[0083] In the above embodiment, the number of fins 240 and the number of diffuser blades 510 are coordinated to achieve a better heat dissipation effect. Based on practical experience, the embodiment of the present invention stipulates that: the number M of fins 240 is greater than or equal to 3 and less than or equal to 17, and the number N of diffuser blades 510 is greater than or equal to 4 and less than or equal to 10. When these conditions are met, the airflow in the air outlet channel 110 is more fluid and the heat dissipation effect is better, thereby achieving a balanced heat dissipation and air intake performance of the fan 1000. If the number of fins 240 is less than 3 and the number N of diffuser blades 510 is less than 4, the resistance of the fins 240 and the diffuser blades 510 to the airflow is small, the effect of extending the airflow through the fins 240 is poor, the heat exchange time between the airflow and the fins 240 is short, and the heat dissipation effect is poor. If the number of fins 240 is greater than 17 and the number N of diffuser blades 510 is greater than 10, the resistance of the fins 240 and the diffuser blades 510 to the airflow is large, the ventilation of the air outlet channel 110 is poor, and the air suction performance of the fan 1000 is poor.

[0084] For the above embodiment, further, the embodiment of the present invention limits the number N of the diffuser blades 510 to 8, the number M of the fins 240 to 13, and the reference Figure 11 , Figure 11 This is a relationship diagram between the average winding temperature and the number of fins when the number N of diffuser blades 510 is 8. The vertical axis is the average winding temperature, and the horizontal axis is the number of fins 240. The average winding temperature parameter on the vertical axis is the temperature of the winding 320. When the number parameter of the fins 240 in the horizontal axis changes, the average winding temperature of the winding 320 also changes. When the number of fins 240 is 13 or 15, the average winding temperature is the lowest. In order to save costs, when the number N of diffuser blades 510 is 8, the number of fins 240 is 13. At this time, the heat dissipation effect is better and the cost is lower.

[0085] Since the interior of the housing 200 is relatively closed and the ventilation is poor, based on this, refer to Figure 2 and Figure 4 As shown, it is understood that the housing 200 is provided with ventilation slots 250, which are formed by removing material. A plurality of ventilation slots 250 may be provided, and multiple ventilation slots 250 are arranged along the circumference of the housing 200. For example, three ventilation slots 250 are arranged at 120-degree intervals. The ventilation slots 250 can increase the gap space to enhance the fluidity of the airflow within the housing 200. The airflow can remove heat from the housing 200, thereby enhancing the heat dissipation effect.

[0086] It can be understood that the casing 200 is cast from aluminum alloy material through a casting process. Aluminum alloy has the characteristics of low density, high strength, strong corrosion resistance and high thermal conductivity, which can make the casing 200 have the advantages of high structural strength, low weight and good heat dissipation performance.

[0087] Because wind turbine 1000 has certain requirements for waterproofing, the surface of casing 200 is required to have certain water resistance and corrosion resistance. Based on this, it can be understood that in the above-mentioned embodiment, the surface of casing 200 is treated with at least one of electroplating, anodizing, and passivation processes to form a protective film on the surface of casing 200. This can enhance corrosion resistance, reduce surface defects on casing 200, and improve the surface gloss of casing 200, making it more aesthetically pleasing. Furthermore, the protective film is very thin, which has a minimal impact on the thermal conductivity of casing 200 and does not affect the heat dissipation performance of casing 200.

[0088] It is understood that the impeller is made of PPS or PBT. PPS, or polyphenylene sulfide, is a new high-performance thermoplastic resin that improves the impeller's structural strength and high-temperature resistance. PBT, or polybutylene terephthalate, is a thermoplastic engineering polymer that enhances the impeller's mechanical strength and high-temperature resistance. Furthermore, glass fiber can be added to the PPS or PBT materials to further enhance the impeller's structural strength and high-temperature resistance.

[0089] Reference Figure 1As shown, it can be understood that the fan 1000 further includes a circuit substrate 800, which is located on the top of the housing 200 and inside the end cover 700. The circuit substrate 800 has a lead connected to an external power line.

[0090] The floor scrubber according to the second embodiment of the present invention includes the fan 1000 of the above embodiment. Therefore, the floor scrubber can achieve the technical effects of the above embodiment, which will not be described in detail here.

[0091] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A fan, characterized in that: include: The housing assembly comprises an outer shell and a casing, wherein the outer shell is sleeved on the casing, and an air outlet channel is formed between the outer shell and the casing; a stator assembly, mounted in the housing; a rotor assembly, rotatably connected to the stator assembly, wherein the rotating shaft of the stator assembly is fixedly connected to an impeller; In which, the outer wall of the casing is provided with fins, at least part of the structure of the fins is located in the air outlet channel, and part of the casing is concave inward to form an arc-shaped surface, and the arc-shaped surface is used to guide the airflow in the air outlet channel to flow along the surface of the casing, and the fins are provided at the arc-shaped surface. The casing includes a first section shell and a second section shell arranged in a vertical direction, the first section shell is located below the second section shell, the outer diameter of the second section shell is smaller than the outer diameter of the first section shell, and the air outlet channel is located between the second section shell and the outer shell. At the position of the arc-shaped surface area, the outer diameter of the casing gradually decreases in the direction toward the bottom of the casing, and the arc-shaped surface connects the first section shell and the second section shell. The stator assembly is attached to the inner wall of the casing, and the positions of the stator assembly, the arc-shaped surface and the fins are correspondingly arranged.

2. The fan according to claim 1, characterized in that There are a plurality of fins, and the plurality of fins are arranged along the circumference of the casing.

3. The fan according to claim 1, characterized in that The distance from the edge of the fin to the housing gradually increases in a direction toward the air inlet end of the air outlet channel.

4. The fan according to claim 1, characterized in that The fan includes a diffuser, which is installed on the casing. The diffuser is provided with a plurality of diffuser blades. A diffuser channel is formed between two adjacent diffuser blades. The diffuser channel is located between the impeller and the air outlet channel.

5. The fan according to claim 4, characterized in that: The number M of the fins is greater than or equal to 3 and less than or equal to 17, and the number N of the diffuser blades is greater than or equal to 4 and less than or equal to 10.

6. The fan according to claim 1, characterized in that The maximum thickness W of the fin is greater than or equal to 0.2 mm and less than or equal to 5 mm.

7. The fan according to claim 1, characterized in that The casing is made of aluminum alloy material.

8. The fan according to claim 1, characterized in that The surface of the housing is processed by at least one of electroplating, anodizing and passivation processes.

9. The fan according to claim 1, characterized in that The fan comprises a wind cover, which is connected to the housing assembly and is arranged on the impeller. The wind cover is provided with an air inlet.

10. Floor scrubber, characterized in that: The invention comprises a fan as claimed in any one of claims 1 to 9.

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