Fan and scrubber

Abstract

The application discloses a fan, and discloses a scrubber with the fan, the fan comprising a shell assembly, a stator assembly and a rotor assembly, the shell assembly comprising an outer shell and a casing, the outer shell being sleeved on the casing, an air outlet channel being formed between the outer shell and the casing, the stator assembly being installed in the casing, the rotor assembly being rotatably connected with the stator assembly, and a rotating shaft of the rotor assembly being fixedly connected with an impeller, wherein the casing is provided with a heat dissipation rib, the heat dissipation rib abutting against the stator assembly to conduct heat of the stator assembly to the casing, the heat dissipation rib can conduct heat of the stator assembly to the casing, and airflow in the air outlet channel flows through the surface of the casing to take away heat of the casing, thereby enhancing the heat dissipation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a fan and a scrubber. BACKGROUND

[0002] The scrubber is a cleaning device integrating sweeping, mopping and washing, which can be used in dry and wet environments to clean dry and wet garbage.

[0003] In the related art, the rotor assembly of the fan drives the impeller to rotate, forming a large vacuum degree at the inlet of the air cover, and the airflow is sucked into the inlet of the air cover. The scrubber requires a large suction force, and the rotational speed of the fan is required to be high, resulting in a large heat generation of the stator assembly of the fan. In addition, the scrubber is used in dry and wet environments, and has certain waterproof requirements for the fan, requiring the structure of the fan to have good airtightness. In the case that the airtightness of the fan is good, the heat of the stator assembly cannot be dissipated in time, which may cause the fan to overheat and be damaged. Therefore, the fan has certain room for improvement. SUMMARY

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

[0005] The present application also provides a scrubber with the above fan.

[0006] The fan according to the first aspect of the present application comprises:

[0007] A housing assembly comprising an outer shell and a casing, the outer shell being sleeved on the casing, and an air outlet channel being formed between the outer shell and the casing;

[0008] A stator assembly installed in the casing;

[0009] A rotor assembly rotationally connected with the stator assembly, and a rotating shaft of the rotor assembly being fixedly connected with an impeller;

[0010] The casing is provided with a heat dissipation rib, and the heat dissipation rib abuts against the stator assembly to conduct the heat of the stator assembly to the casing.

[0011] The fan according to the first aspect of the present application has at least the following beneficial effects: the rotating shaft of the rotor assembly drives the impeller to rotate, the impeller sucks in the airflow, the airflow flows out from the air outlet side of the impeller, the airflow obtains kinetic energy, and the airflow can enter the air outlet channel. At the same time, the heat dissipation rib abuts against the stator assembly, and the heat dissipation rib can conduct the heat of the stator assembly to the casing. Since the air outlet channel is formed between the casing and the outer shell, the airflow in the air outlet channel can flow through the surface of the casing to carry away the heat of the casing, thereby achieving the effect of enhancing the heat dissipation effect.

[0012] According to some embodiments of the present application, the plurality of heat dissipation ribs are arranged along the circumference of the casing.

[0013] According to some embodiments of the present application, the casing is provided with a plurality of guide ribs for guiding the stator assembly into the casing.

[0014] According to some embodiments of the present application, the plurality of guide ribs are arranged along the circumference of the casing.

[0015] According to some embodiments of the present application, the plurality of heat dissipation ribs and the plurality of guide ribs are arranged alternately along the circumference of the casing.

[0016] According to some embodiments of the present application, the stator assembly is in interference fit with the plurality of guide ribs.

[0017] According to some embodiments of the present application, the mating surface of the stator assembly and the guide ribs is arc-shaped, the interference amount X of the stator assembly and the guide ribs is equal to half of the difference between the outer diameter D of the stator assembly and the diameter K1 of a reference circle formed by the plurality of arc-shaped surfaces, the X is greater than or equal to 0.005 mm and less than or equal to 0.5 mm.

[0018] According to some embodiments of the present application, the casing comprises an annular inner wall, the heat dissipation ribs are arranged on the annular inner wall, and the sum of the arc length L of the heat dissipation ribs and the height H of the heat dissipation ribs is less than or equal to the inner diameter K2 of the annular inner wall.

[0019] According to some embodiments of the present application, the ratio of the outer diameter D of the stator assembly to the number N of slots of the stator assembly is greater than or equal to 1.25 and less than or equal to 20.

[0020] According to some embodiments of the present application, the casing is made of aluminum alloy material.

[0021] According to some embodiments of the present application, the fan comprises a fan cover connected to the housing assembly, the fan cover covers the impeller, and the fan cover is provided with an air inlet.

[0022] The scrubber according to the second aspect of the embodiments of the present application comprises the fan according to the first aspect of the embodiments of the present application.

[0023] The scrubber provided by the embodiment of the present application has at least the following beneficial effects: the fan provided by the first aspect of the present application, the rotating shaft of the rotor assembly drives the impeller to rotate, the impeller inhales the air flow, the air flow flows out from the air outlet side of the impeller, the air flow obtains kinetic energy, the air flow can enter the air outlet channel, meanwhile, the heat dissipation ribs abut against the stator assembly, the heat dissipation ribs can conduct the heat of the stator assembly to the machine shell, since the air outlet channel is formed between the machine shell and the outer shell, the air flow in the air outlet channel can flow through the surface of the machine shell and take away the heat of the machine shell, so that the heat dissipation effect is enhanced.

[0024] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0026] Figure 1 A sectional view of the fan provided by the first aspect of the present application;

[0027] Figure 2 A structural schematic view of the machine shell provided by some embodiments of the present application;

[0028] Figure 3 An enlarged view of A shown in FIG. 1; Figure 2

[0029] An enlarged view of B shown in FIG. 1; Figure 4

[0030] An enlarged view of C shown in FIG. 1; Figure 5 Figure 4 A structural schematic view of the stator assembly provided by some embodiments of the present application;

[0031] Figure 6 A structural schematic view of the machine shell provided by some embodiments of the present application;

[0032] Figure 7 An enlarged view of D shown in FIG. 2;

[0033] Figure 8 Figure 7 An enlarged view of E shown in FIG. 2;

[0034] Figure 9 A structural schematic view of the fan provided by some embodiments of the present application;

[0035] Figure 10 A structural schematic view of the outer shell provided by some embodiments of the present application;

[0036] Figure 11 A graph showing the relationship between the number of fins and the winding temperature in the fan provided by some embodiments of the present application.​​

[0037] Reference signs:

[0038] Fan 1000;

[0039] Housing 100, air outlet channel 110;

[0040] Casing 200, guide rib 210, arc surface 211, heat dissipation rib 220, arc curved surface 230, first section curved surface 231, second section curved surface 232, fin 240, bevel 241, ventilation groove 250, annular inner wall 260, first section housing 270, second section housing 280;

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

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

[0043] Diffuser 500, diffuser blade 510;

[0044] Fan cover 600, air inlet 610, impeller cavity 620;

[0045] End cover 700;

[0046] Circuit substrate 800. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary only and are intended to explain the present application, and are not to be understood as limiting the present application.

[0048] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[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 1 As 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] Referring to Figure 1 , Figure 2 , Figure 9 and Figure 10 , specifically, the shell assembly includes an outer shell 100 and a casing 200, the outer shell 100 has a cavity inside and is open at both ends in the axial direction, the casing 200 has a substantially cylindrical structure, the casing 200 is installed in the cavity of the outer shell 100, one end of the casing 200 extends into the cavity of the outer shell 100, the outer shell 100 is sleeved on the casing 200, the outer shell 100 is located outside the casing 200 and surrounds the casing 200, the inner circumferential wall of the outer shell 100 and the outer circumferential wall of the casing 200 define an air outlet channel 110, and the air outlet channel 110 has an annular structure. It should be noted that part of the casing 200 is located inside the air outlet channel 110, and part of the casing 200 is located outside the air outlet channel 110, and the airflow in the air outlet channel 110 can flow along the surface of the casing 200.

[0057] More specifically, the casing 200 has a mounting cavity inside, and the stator assembly 300 is installed in the mounting cavity of the casing 200. A stator mounting portion can be provided in the mounting cavity of the casing 200, and the stator assembly 300 is connected to the stator mounting portion by bolts, or the stator assembly 300 is fixed to the mounting cavity of the casing 200 by adhesive. The rotor assembly 400 is rotatably connected to the stator assembly 300. Specifically, the rotating shaft 410 of the rotor assembly 400 is located in the stator core 310 of the stator assembly 300, and the rotating shaft 410 and the stator core 310 have a gap therebetween, and the rotating shaft 410 can rotate relative to the stator core 310. The rotating shaft 410 is arranged in the axial direction of the casing 200, and the end of the rotating shaft 410 extends out of the bottom of the casing 200, and 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, and the rotating shaft 410 can drive the impeller 411 to rotate. The impeller 411 is located below the air outlet channel 110.

[0058] In order to have better sealing performance, the fan 1000 further includes a fan cover 600 and an end cover 700. The fan cover 600 is installed on the bottom of the outer shell 100, and a sealing ring can be arranged between the inner circumferential wall of the fan cover 600 and the outer circumferential wall of the outer shell 100 to form a sealed connection. The fan cover 600 is provided with an impeller cavity 620, the impeller cavity 620 is communicated with the air outlet channel 110, the impeller 411 is located in the impeller cavity 620, and the fan cover 600 covers the impeller 411. The bottom of the fan cover 600 is provided with an air inlet 610. The end cover 700 is installed on the top of the casing 200, and the end cover 700 covers the mounting cavity of the casing 200 to ensure good sealing performance.

[0059] Referring to Figure 2 and Figure 3As shown, the housing 200 is provided with a heat dissipation rib 220. Specifically, the housing 200 includes an annular inner wall 260 which can be formed by an inner circumferential wall of the housing 200. The heat dissipation rib 220 is arranged on the annular inner wall 260. The heat dissipation rib 220 is located between the housing 200 and the stator assembly 300 and abuts against the stator assembly 300. The heat dissipation rib 220 is in close contact with the outer wall of the stator assembly 300. The mating surface of the heat dissipation rib 220 and the stator assembly 300 is arc-shaped. Therefore, the heat dissipation rib 220 can conduct the heat of the stator assembly 300 to the housing 200. It can be understood that the heat dissipation rib 220 can be integrally formed with the housing 200, which is convenient to manufacture.

[0060] When the fan 1000 is working, the rotor assembly 400 drives the impeller 411 to rotate. The impeller 411 inhales air flow. A relatively large vacuum degree is formed at the air inlet 610 of the fan cover 600. The air flow is inhaled into the air inlet 610 of the fan cover 600. The air flow flows out of the air outlet side of the impeller 411. The air flow is extruded to obtain a relatively large kinetic energy, thereby entering the air outlet channel 110. At the same time, the heat dissipation rib 220 conducts the heat of the stator assembly 300 to the housing 200. The air flow in the air outlet channel 110 can flow through the surface of the housing 200 to take away the heat of the housing 200. In the case that the fan 1000 has good sealing performance, the heat dissipation effect of the fan 1000 is enhanced, and the accumulation of heat of the stator assembly 300 and the failure of timely dissipation are reduced.

[0061] It can be understood that the mating surface of the heat dissipation rib 220 and the stator assembly 300 can also have an irregular shape. The heat dissipation area of the heat dissipation rib 220 and the stator assembly 300 can be increased by increasing the area of the mating surface of the heat dissipation rib 220 and the stator assembly 300. Therefore, the heat dissipation rib 220 can conduct more heat, and the heat dissipation effect of the heat dissipation rib 220 is further enhanced.

[0062] Referring to Figure 2 and Figure 4 It can be understood that the heat dissipation rib 220 can be provided in plurality. The plurality of heat dissipation ribs 220 are arranged at intervals along the circumference of the housing 200. The plurality of heat dissipation ribs 220 can increase the contact area with the stator assembly 300, thereby enhancing the heat dissipation effect of the heat dissipation rib 220. For example, the heat dissipation rib 220 is provided with three heat dissipation ribs 220 which are arranged at intervals of 120 degrees. The heat conduction is relatively uniform, and the heat dissipation effect is good.

[0063] Referring to Figures 1 to 4As shown, it can be understood that the guide ribs 210 are arranged in the casing 200, specifically, the guide ribs 210 are arranged on the annular inner wall 260 of the casing 200, the guide ribs 210 are in a convex structure, and the guide ribs 210 can guide the stator assembly 300 to be installed in the casing 200. Specifically, the stator assembly 300 is in interference fit with the guide ribs 210, the fitting surface of the guide ribs 210 and the stator assembly 300 is an arc surface 211, the stator assembly 300 presses the guide ribs 210, and the stator assembly 300 can be tightly attached to the guide ribs 210, so that the guide ribs 210 can conduct the heat generated by the stator assembly 300 to the outer wall of the casing 200, thereby enhancing the heat dissipation effect. It can be understood that the guide ribs 210 can be integrally formed with the casing 200 to facilitate manufacturing.

[0064] It can be understood that the fitting surface of the guide ribs 210 and the stator assembly 300 can also be irregularly shaped, and the area of the fitting surface of the guide ribs 210 and the stator assembly 300 can be increased to ensure that the stator assembly 300 is tightly fitted with the guide ribs 210 after being pressed in, and at the same time, the heat conduction area of the guide ribs 210 and the stator assembly 300 can be increased to enhance the heat dissipation effect.

[0065] Referring to Figure 3 and Figure 4 As shown, it can be understood that the guide ribs 210 can be provided in plurality, and the plurality of guide ribs 210 are arranged at intervals along the circumference of the casing 200, for example, three guide ribs 210 are arranged at intervals of 120 degrees. The plurality of guide ribs 210 can increase the contact area of the stator assembly 300 and the guide ribs 210 to enhance the heat dissipation effect of the guide ribs 210 and carry away more heat, and at the same time, the pressing angle of the stator assembly 300 can be fixed to facilitate subsequent assembly of the stator assembly 300 and the end cover 700. The plurality of guide ribs 210 can also be equidistantly arranged along the circumference of the casing 200, for example, three guide ribs 210 can be arranged, and the three guide ribs 210 are arranged at intervals of 120 degrees. Under the condition that the stator assembly 300 is firmly fitted with the guide ribs 210, the heat dissipation effect is better. It can be understood that when the guide ribs 210 are provided in plurality, the guide ribs 210 also have plurality of arc surfaces 211, and the plurality of arc surfaces 211 are arranged at intervals along the circumference of the casing 200, and a reference circle is formed between the plurality of arc surfaces 211, and the reference circle has a diameter.

[0066] Referring to Figure 3 , Figure 5 and Figure 6As shown, for the above-mentioned embodiment, according to a large amount of experimental data, the embodiment of the present application limits that the interference amount X of the stator assembly 300 and the guide ribs 210 is equal to half of 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 arc surfaces 211, X is greater than or equal to 0.005 mm, and X is less than or equal to 0.5 mm, and the diameter K1 of the reference circle is determined by the thickness of the guide ribs 210. When the above-mentioned conditions are met, the pressing force between the stator assembly 300 and the guide ribs 210 can be moderate, and the assembly tightness and the heat conduction performance of the stator assembly 300 and the guide ribs 210 can be considered. If X is less than 0.005 mm, the pressing force between the stator assembly 300 and the guide ribs 210 is too low, the stator assembly 300 is easy to loosen, and the stator assembly 300 and the guide ribs 210 are not close enough, and the heat conduction effect is poor. If X is greater than 0.5 mm, the pressing force between the stator assembly 300 and the guide ribs 210 is too large, and when the stator assembly 300 is pressed, the interference pressing force required by the stator assembly 300 is too large, which is not conducive to assembly, and the large pressing force between the stator assembly 300 and the guide ribs 210 will also damage the structure of the stator assembly 300 and the guide ribs 210.

[0067] Further, for the above-mentioned embodiment, the embodiment of the present application limits that the interference pressing force F of the stator assembly 300 is less than or equal to 6000N. When the above-mentioned condition is met, when the stator assembly 300 is pressed, the pressing force between the stator assembly 300 and the guide ribs 210 can be low, and the damage to the structure can be reduced. If the interference pressing force F is greater than 6000N, the stator assembly 300 and the guide ribs 210 will be damaged more seriously, for example, the guide ribs 210 will have cracks and other defects.

[0068] Referring to Figure 2 and Figure 4 As shown, it can be understood that the heat dissipation ribs 220 and the guide ribs 210 can be provided in plurality, and the heat dissipation ribs 220 and the guide ribs 210 are arranged alternately and spaced along the circumference of the casing 200, so that the heat conduction of the stator assembly 300 is more uniform, and the pressing force on the stator assembly 300 is also more balanced. For example, three guide ribs 210 and three heat dissipation ribs 220 are provided, the three guide ribs 210 are spaced 120 degrees along the circumference of the casing 200, the three heat dissipation ribs 220 are also arranged 120 degrees along the circumference of the casing 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 shell 200 includes a first shell section 270 and a second shell section 280 arranged in a vertical direction, the first shell section 270 is located below the second shell section 280, the outer diameter of the second shell section 280 is smaller than that of the first shell section 270, and the air outlet channel 110 is located between the second shell section 280 and the outer shell 100. The outer peripheral wall of part of the shell 200 is inwardly recessed to form an arc-shaped curved surface 230, so that the outer diameter of the shell 200 gradually decreases in the direction towards the bottom of the shell 200 at the position of the arc-shaped curved surface 230, the arc-shaped curved surface 230 connects the first shell section 270 and the second shell section 280, so that the transition from the first shell section 270 to the second shell section 280 is smooth, and the wall thickness of the shell 200 is uniform. In the production and manufacturing, the present embodiment can reduce the defect caused by stress concentration, at the same time, the area of the arc-shaped curved surface 230 is larger, which can also enhance the heat conduction effect of the shell 200.

[0073] For the scheme that the outer peripheral wall of the shell 200 is arranged in a vertical direction, the flow direction of the airflow in the air outlet channel 110 is parallel to the arrangement direction of the outer peripheral wall of the shell 200, the windward area of the outer peripheral wall of the shell 200 is small, and the airflow can carry away less heat, so the heat dissipation effect is poor. In the present embodiment, the airflow in the air outlet channel 110 can collide with the arc-shaped curved surface 230, the arc-shaped curved surface 230 can increase the windward area of the shell 200, and the airflow can carry away more heat. At the same time, the airflow flows along the arc-shaped curved surface 230, the resistance is small, the ventilation of the air outlet channel 110 is good, and the heat dissipation performance and the air suction performance of the fan 1000 are balanced.

[0074] Referring to Figure 1 As shown, specifically, the arc-shaped curved surface 230 includes a first curved surface 231 and a second curved surface 232, the inward recess degree of the second curved surface 232 is greater than that of the first curved surface 231, the first curved surface 231 is connected with the first shell section 270, the first curved surface 231 is located above the air outlet channel 110, the first curved surface 231 is connected with the second curved surface 232, the second curved surface 232 is connected with the second shell section 280, and part of the second curved surface 232 is located in the air outlet channel 110. For the scheme that a right-angled transition surface is arranged to connect the first shell section 270 and the second shell section 280, the airflow will be subjected to great resistance, so that the ventilation of the air outlet channel 110 is poor, thereby affecting the air suction performance of the fan 1000. The first curved surface 231 and the second curved surface 232 of the present embodiment can guide the airflow in the air outlet channel 110 to flow, the airflow in the air outlet channel 110 flows along the surfaces of the first shell section 270, the first curved surface 231, the second curved surface 232 and the second shell section 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 good.

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

[0076] Referring to FIGS. 1-3, Figure 1 , Figure 7 and Figure 8 It can be understood that the outer peripheral wall of the shell 200 is provided with a fin 240, the fin 240 is integrally formed with the shell 200, the fin 240 has a protruding sheet structure, the fin 240 can be arranged at the outlet of the air outlet channel 110, part of the structure of the fin 240 can extend into the air outlet channel 110, the extension direction of the fin 240 can be the same as the flow direction of the airflow in the air outlet channel 110, the fin 240 can extend in the vertical direction, the fin 240 has a resistance effect on the airflow, which can slow down the flow speed of the airflow, thereby prolonging the time of the airflow passing through the fin 240, so that the airflow can be fully exchanged with the fin 240, and the airflow can also be fully exchanged with the shell 200, thereby fully utilizing the airflow in the air outlet channel 110 to take away the heat of the shell 200, so as to enhance the heat dissipation effect. In addition, since the fin 240 is connected with the shell 200, the shell 200 can also conduct heat to the fin 240, and since the fin 240 has a sheet structure, the heat conduction area can be increased, and the heat dissipation effect of the shell 200 is better.

[0077] Referring to FIGS. 1-3, Figure 1 It can be understood that the distance from the edge of the fin 240 to the shell 100 gradually increases in the direction towards the air inlet end of the air outlet channel 110, and when the shell 100 is a rotating body, the distance from the edge of the fin 240 to the shell 100 can be understood as the distance from the edge of the fin 240 to the generatrix of the shell 100, so that the edge of the fin 240 forms an oblique edge 241, the oblique edge 241 extends in a straight line direction, so that the area of the fin 240 is smaller, thereby appropriately reducing the resistance of the fin 240 to the airflow in the air outlet channel 110, so as to make the ventilation performance of the air outlet channel 110 good, thereby ensuring the air suction performance of the fan 1000. It can be understood that the oblique edge 241 can also extend in an arc direction.

[0078] The thickness of the fin 240 has an influence on the resistance of the airflow in the air outlet channel 110. According to a large amount of experimental data, the embodiment of the present application limits 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 the present embodiment is uniform, and the thickness of the fin 240 at each position 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 prolonging the time of airflow passing through the fin 240 is also better, and the fin 240 can balance the air suction performance and the 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 prolonging the time of airflow passing through the fin 240 is poor. If the maximum thickness W of the fin 240 is greater than 5 mm, the resistance of the fin 240 to the airflow in the air outlet channel 110 is large, which is not conducive to the ventilation of the air outlet channel 110, and will affect the air suction performance of the fan 1000.

[0079] Referring to Figure 1 and Figure 7 It can be understood that the fin 240 is arranged at the arc-shaped curved surface 230, the fin 240 is connected with the arc-shaped curved surface 230, and the fin 240 can be arranged in plurality, the plurality of fins 240 are arranged along the circumference of the arc-shaped curved surface 230, the arc-shaped curved surface 230 can guide the airflow to flow along the arc-shaped curved surface 230, reduce the resistance to the airflow, and the fin 240 can fully utilize the airflow to realize heat exchange and take away the heat of the casing. The combination of the fin 240 and the arc-shaped curved surface 230 can ensure that the airflow has good flowability, and enhance the heat dissipation while balancing the air suction performance and the heat dissipation performance.

[0080] Referring to Figure 1 and Figure 7 For the above embodiment, it can be understood that the positions of the stator assembly 300, the arc-shaped curved surface 230 and the fin 240 are correspondingly arranged, so that the distance between the stator assembly 300, the arc-shaped curved surface 230 and the fin 240 is small, the distance of heat transfer is reduced, the heat conduction is faster, the heat of the stator assembly 300 can be conducted to the outside of the casing 200 faster, the airflow of the air outlet channel 110 takes away the heat, and the heat dissipation effect can be further enhanced.

[0081] Referring to Figure 1 and Figure 7As shown, it can be understood that the fin 240 is provided in plurality, the plurality of fins 240 are arranged at intervals along the outer peripheral wall of the casing 200, and the plurality of fins 240 can also be arranged at equidistance intervals along the outer peripheral wall of the casing 200. The plurality of fins 240 can increase the resistance of the airflow of the air outlet channel 110, further prolong the time of the airflow of the air outlet channel 110 passing through the fin 240, achieve the effect of sufficient heat exchange, and the plurality of fins 240 can increase the heat conduction area, the casing 200 can conduct more heat to the fin 240, further enhance the heat dissipation effect.

[0082] Referring to Figure 1 and Figure 10 As shown, it can be understood that the impeller 411 and the air outlet channel 110 are provided with a diffuser 500, the diffuser 500 is installed at the bottom of the casing 200, the diffuser 500 is located in the cavity of the shell 100, and the diffuser 500 can convert the kinetic energy of the airflow into pressure energy to reduce the flow rate of the airflow to achieve pressure increase. Specifically, the diffuser 500 includes diffuser blades 510, the diffuser blades 510 are arranged obliquely, the diffuser blades 510 are provided in plurality, the diffuser blades 510 are arranged at intervals along the circumference of the shell 100, the diffuser blades 510 are located in the annular region at the bottom of the shell 100, and the diffuser channel is formed between adjacent two diffuser blades 510. The airflow flows out from the air outlet side of the impeller 411 to obtain kinetic energy, and then enters the diffuser channel. The diffuser channel converts the kinetic energy of the airflow into pressure energy to achieve deceleration and pressure increase of the airflow.

[0083] For the above-mentioned embodiments, the number of fins 240 cooperates with the number of diffuser blades 510 to achieve better heat dissipation effect. According to actual experience, the number M of fins 240 is greater than or equal to 3, and the number M of fins 240 is less than or equal to 17, the number N of diffuser blades 510 is greater than or equal to 4, and the number N of diffuser blades 510 is less than or equal to 10. When the above conditions are met, the airflow in the air outlet channel 110 has good flowability, and the heat dissipation effect is better. The heat dissipation performance and air suction performance of the fan 1000 can be considered at the same time. 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 airflow to the fins 240 and the diffuser blades 510 is small, the effect of prolonging the airflow passing through the fins 240 is poor, the heat exchange time between the airflow and the fins 240 is short, and thus 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 airflow to the fins 240 and the diffuser blades 510 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-mentioned embodiments, further, the number N of diffuser blades 510 is 8, and the number M of fins 240 is 13, referring to Figure 11 , Figure 11This 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 comprises a circuit board 800, the circuit board 800 is located at the top of the casing 200, the circuit board 800 is located in the end cover 700, and the circuit board 800 has a lead wire connected with an external power line.

[0090] The scrubber according to the second aspect of the present application comprises the fan 1000 of the above-mentioned embodiments, so that the scrubber can achieve the technical effects of the above-mentioned embodiments, which will not be described herein again.

[0091] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

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 is rotatably connected to the stator assembly, and a rotating shaft of the rotor assembly is fixedly connected to an impeller; In which, a heat dissipation rib is provided in the casing, and the heat dissipation rib abuts the stator assembly to conduct the heat of the stator assembly to the casing. There are multiple heat dissipation ribs, and the multiple heat dissipation ribs are arranged at intervals along the circumference of the casing; the casing includes an annular inner wall, and the heat dissipation rib is provided on the annular inner wall. The heat dissipation rib is interference fit with the stator assembly, and the sum of the arc length L of the heat dissipation rib and the height H of the heat dissipation rib is less than or equal to the inner diameter K2 of the annular inner wall.

2. The fan according to claim 1, characterized in that Guide ribs are provided in the casing, and the guide ribs are used to guide the stator assembly to be installed into the casing.

3. The fan according to claim 2, characterized in that: There are a plurality of guide ribs, and the plurality of guide ribs are spaced apart along the circumference of the housing.

4. The fan according to claim 2, characterized in that: There are a plurality of heat dissipation ribs and a plurality of guide ribs, and the heat dissipation ribs and the guide ribs are spaced and alternately arranged along the circumference of the housing.

5. The fan according to claim 3, characterized in that: The stator assembly is interference-fitted with the plurality of guide ribs.

6. The fan according to claim 5, characterized in that The mating surface between the stator assembly and the guide rib is an arcuate surface. The interference X between the stator assembly and the guide rib is equal to half of the difference between the outer diameter D of the stator assembly and the diameter K1 of the reference circle formed by the multiple arcuate surfaces. The X is greater than or equal to 0.005 mm and less than or equal to 0.5 mm.

7. The fan according to claim 1, characterized in that A ratio of an outer diameter D of the stator assembly to a number N of slots of the stator assembly is greater than or equal to 1.25 and less than or equal to 20.

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

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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