Fan and ground cleaning equipment

Abstract

The invention discloses a fan and ground cleaning equipment with the fan. The fan comprises a shell, a motor and a diffuser. A first containing space and an air inlet communicated with the first containing space are formed in the shell, at least part of the motor is arranged in the first containing space, the motor is provided with an output shaft, the diffuser is arranged on the motor in a sleeving mode and connected with the motor, the diffuser comprises a first diffuser body, the first diffuser body is located in the first containing space, and the first diffuser body is provided with a plurality of first blades. Each first blade comprises a windward side and a leeward side which are arranged oppositely, and each first blade is provided with a vent hole communicated with the windward side and the leeward side. According to the fan and the ground cleaning equipment with the fan, the first blade is provided with the vent hole, so that the windward side is communicated with the leeward side, and gas can directly flow to one side of the leeward side of the first blade through the vent hole, so that the pressure difference between the windward side and the leeward side is reduced, and the aerodynamic force on the surface of the first blade is reduced; finally, the aerodynamic noise is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of cleaning equipment, and more specifically, to a fan and floor cleaning equipment. Background Art

[0002] A fan is a machine that relies on mechanical energy to increase gas pressure and discharge the gas. Fans are mainly used in floor cleaning equipment such as vacuum cleaners. Fans usually include impellers and diffusers. The impeller rotates to generate airflow, which is then discharged after being expanded by the diffuser. However, the gas is sucked into a narrow space due to the rotation of the impeller, and the high-speed airflow will collide and rub against the diffuser, causing vibration and noise. Summary of the invention

[0003] Embodiments of the present application provide a fan and a floor cleaning device having the fan.

[0004] A fan according to an embodiment of the present application includes:

[0005] a housing, wherein the housing is formed with a first accommodating space and an air inlet communicating with the first accommodating space;

[0006] a motor, wherein the motor is at least partially disposed in the first accommodating space;

[0007] A diffuser, wherein the diffuser is sleeved on the motor and connected to the motor, the diffuser comprises a first diffuser, the first diffuser is located in the first accommodating space, the first diffuser has a plurality of first blades, the first blades comprise a windward surface and a leeward surface arranged opposite to each other, and each of the first blades is provided with an air vent connecting the windward surface and the leeward surface.

[0008] In some embodiments, projections of two adjacent first blades along a direction perpendicular to the windward surface at least partially overlap, and positions of the vents overlap with projections of inlet ends of adjacent first blades along the first direction.

[0009] In some embodiments, the diffuser further comprises:

[0010] a second diffuser, the second diffuser comprising an annular side wall and a plurality of second blades, the plurality of second blades being arranged circumferentially along an inner wall of the annular side wall, and the annular side wall being further connected to the casing; or

[0011] The diffuser further comprises:

[0012] A third diffuser is located between the second diffuser and the first diffuser, and has a plurality of third blades.

[0013] In some embodiments, the end face of the first blade outlet end is coplanar with the end face of the third blade inlet end, and the end face of the third blade outlet end is coplanar with the end face of the second blade inlet end.

[0014] In some embodiments, the annular side wall is connected to the housing by interference fit.

[0015] In some embodiments, the annular side wall forms a cavity, and the third diffuser is located in the cavity.

[0016] In some embodiments, the second diffuser is provided with a support frame, the support frame is connected to the motor, the third diffuser is provided with a fixing groove, and the fixing groove is matched with the support frame.

[0017] In some embodiments, the first diffuser further includes a first connecting portion, the first connecting portion is connected to the support frame, and a plurality of the first blades are circumferentially arranged along the outer edge of the first connecting portion.

[0018] In some embodiments, the first diffuser further includes a plurality of fourth blades, each fourth blade is connected to the air outlet end of one of the first blades, a drainage gap is formed between two adjacent fourth blades, the fourth blades are connected to the first blades in one-to-one correspondence, and the plurality of fourth blades enclose a second accommodation space, and the drainage gap communicates with the second accommodation space.

[0019] In some embodiments, the inner surface of the fourth blade communicates with the leeward surface of the first blade, and the outer surface of the fourth blade communicates with the windward surface of the first blade.

[0020] A floor cleaning device according to another embodiment of the present application includes the blower according to any one of the above claims.

[0021] A blower and a floor cleaning device having the blower according to an embodiment of the present application, by providing ventilation holes in the first blade, enabling the windward surface and the leeward surface to communicate. When the impeller sucks air into the housing to form a high-speed air flow, the high-speed air flow impacts on the windward surface of the first blade. At this time, part of the air will directly flow to the leeward side of the first blade through the ventilation holes, so as to reduce the pressure difference between the windward surface and the leeward surface, thereby reducing the aerodynamic force on the surface of the first blade, and finally achieving the reduction of aerodynamic noise.

[0022] Additional aspects and advantages of the embodiments of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the embodiments of the present application. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0024] Figure 1 is a schematic structural diagram of a blower of an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a motor of an embodiment of the present application;

[0026] Figure 3 is a schematic structural diagram of a first diffuser of an embodiment of the present application;

[0027] Figure 4 is a schematic diagram of the opening position of a vent hole of an embodiment of the present application;

[0028] Figure 5 is a spectrogram of noise generated when the vent hole is at different positions of an embodiment of the present application;

[0029] Figure 6 is a schematic structural diagram of the first diffuser from another perspective of an embodiment of the present application;

[0030] Figure 7 is a schematic structural diagram of a second diffuser of an embodiment of the present application;

[0031] Figure 8 is a schematic structural diagram of a third diffuser of an embodiment of the present application;

[0032] Figure 9 is a schematic structural diagram of an impeller of an embodiment of the present application.

[0033] Main element symbol description: blower 100, housing 10, air inlet 11, first accommodation space 12, motor 20, output shaft 21, limit groove 22, coil winding 23, diffuser 30, first diffuser 31, first blade 311, vent hole 312, first connection part 313, avoidance hole 3131, stepped slot hole 3132, fourth blade 314, drainage gap 315, second accommodation space 316, second diffuser 32, annular side wall 321, connection groove 3211, second blade 322, first inner connection ring 323, limit boss 3231, cavity 324, support frame 325, fixing ring 3251, support leg 3252, third diffuser 33, third blade 331, second inner connection ring 332, fixing slot 3321, impeller 40, top cover 41, fifth blade 42, base 43, second connection part 431, air inlet 44, air outlet 45. Detailed embodiments

[0034] The embodiments of the present application will be further described below in conjunction with the accompanying drawings. The same or similar reference numerals in the drawings denote the same or similar elements or elements having the same or similar functions throughout.

[0035] In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be construed as a limitation of the present application.

[0036] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] The blower 100 in the existing vacuum cleaner is composed of a housing 10, an impeller 40, and a diffuser 30. The diffuser 30 includes a bladeless diffuser, a first-stage diffuser, and a second-stage diffuser. The blade-frequency aerodynamic noise of the blower 100 is generated by the dynamic and static interference between the trailing-edge airflow of the impeller 40 and the leading edge of the diffuser 30 blades. The traditional design is to completely seal the diffuser flow path, which is very effective for improving efficiency, but there are still defects. For example, the trailing-edge airflow of the impeller 40 impacts the leading edge of the diffuser blades with blades, resulting in harsh blade-frequency noise, seriously affecting the user experience. And because the impeller 40 rotates at a very high speed, the airflow velocity at the outlet of the diffuser 30 is too fast, and the noise is proportional to the sixth power of the airflow velocity, so the aerodynamic noise is very obvious. However, if a bladeless diffuser is used, it will cause an increase in turbulent noise, and the noise still cannot be effectively solved.

[0038] In view of this, please refer to Figure 1 , the present application discloses a floor cleaning device, and the floor cleaning device includes a blower 100, which includes a housing 10, a motor 20, and a diffuser 30.

[0039] The housing 10 is formed with a first accommodation space 12 and an air inlet 11 communicating with the first accommodation space 12. The motor 20 is at least partially disposed in the first accommodation space 12. The diffuser 30 is sleeved on the motor 20 and connected to the motor 20. The diffuser 30 includes a first diffuser 31. The first diffuser 31 is located in the first accommodation space 12. The first diffuser 31 has a plurality of first blades 311. The first blades 311 include a windward surface and a leeward surface disposed opposite to each other. Each first blade 311 is provided with a ventilation hole 312 communicating the windward surface and the leeward surface.

[0040] A fan 100 and a floor cleaning device having the fan 100 proposed by the embodiments of the present application, by opening ventilation holes 312 on the first blade 311, enabling the windward side and the leeward side to communicate. When the impeller 40 sucks air into the housing 10 to form a high-speed air flow, the high-speed air flow impacts on the windward side of the first blade 311. At this time, part of the air will directly flow to the leeward side of the first blade 311 through the ventilation holes 312 to reduce the pressure difference between the windward side and the leeward side, thereby reducing the aerodynamic force on the surface of the first blade 311, and finally achieving the reduction of aerodynamic noise.

[0041] Please refer to Figure 2 , the motor 20 is an important component in the fan 100, generally divided into a brushed motor and a brushless motor. The brushed motor has low cost and mature technology, but has a short service life, high noise and serious heat generation; the brushless motor has low noise and long service life, but has a high price. Since the performance of the brushless motor is better than that of the brushed motor and the noise is smaller, in this embodiment, the brushless motor is selected for the motor 20, wherein the motor 20 has an output shaft 21.

[0042] Please refer to Figure 4 , the fan 100 further includes an impeller 40, the impeller 40 is arranged on the output shaft 21, and the impeller 40 is located between the air inlet 11 and the first diffuser 31. Specifically, the impeller 40, as a component for energy conversion, is an important part of the fan 100, used to suck in air and accelerate the discharge, thereby generating power or pressure. The impeller 40 includes a top cover 41, a fifth blade 42 and a base 43. An air inlet 44 is opened in the middle of the top cover 41. A second connecting portion 431 is provided in the middle of the base 43, and the second connecting portion 431 connects to the output shaft 21 of the motor 20. The fifth blade 42 is arranged around the second connecting portion 431 on the base 43. One side of the fifth blade 42 is connected to the base 43, and the other side is connected to the top cover 41. The top cover 41, the base 43 and two adjacent fifth blades 42 enclose an exhaust passage and form an air outlet 45 at the edge of the base 43. When the impeller 40 rotates, air is sucked in from the air inlet 44 and discharged from the air outlet 45 after passing through the exhaust passage.

[0043] Please refer to Figure 1 , the diffuser 30 is a device for expanding the suction force of the vacuum cleaner. Its working principle is mainly to decelerate the high-speed flowing air and expand its cross-sectional area, thereby increasing the suction force of the vacuum cleaner. That is, the diffuser 30 introduces the sucked air and dust from a small opening into a gradually expanding space. In this process, the velocity of the fluid gradually decreases while the pressure gradually increases. In this way, the diffuser 30 can convert the low-pressure and high-speed air flow sucked by the vacuum cleaner into a high-pressure and low-speed air flow. This conversion increases the suction force of the vacuum cleaner, enabling it to clean various surfaces more effectively.

[0044] The first blade 311 is inclined with respect to the output shaft 21. When the motor 20 rotates, air enters the interior of the housing 10 of the blower 100. At this time, the air directly blows against the windward surface of the first blade 311, and the other side is the leeward surface of the first blade 311. The ventilation holes 312 penetrate through the first blade 311 to communicate the windward surface and the leeward surface. Preferably, the opening direction of the ventilation holes 312 should be parallel to the first direction so that air can directly pass through the ventilation holes 312 without being blocked and affecting the effect of the ventilation holes 312.

[0045] Please refer to Figures 3 to 5 , in some embodiments, the projections of two adjacent first blades 311 in the direction perpendicular to the windward surface at least partially overlap, and the position of the ventilation holes 312 coincides with the projection of the inlet end of the adjacent first blade 311 in the direction perpendicular to the windward surface. Wherein, the inlet end of the first blade 311 refers to the inlet edge of the first blade 311, that is, the starting position where air flows into the first blade 311. Correspondingly, the outlet end of the first blade 311 refers to the outlet edge of the first blade 311, that is, the position where air flows out of the first blade 311. In other embodiments, in order to improve the performance of the diffuser, the arc of the outlet end can also be adjusted to guide air to flow out of the diffuser blade better, or some protruding or concave structures can be added at the outlet end to reduce the disturbance and loss of air flow.

[0046] Specifically, as Figure 4 shown, at five positions labeled x1, x2, x3, x4, and x5 from right to left in the figure, they are the drilling positions of five different ventilation holes 312. As Figure 5 shown, it is the spectrogram of the ventilation holes 312 opened at different positions on the blade. Among them, the mass-produced prototype is a blower with the first blade 311 not drilled. The abscissa represents the frequency, the unit is Hertz, and the ordinate is the noise sound power, that is, the total energy radiated by the noise sound source into space per unit time, and the unit is watt or dB(A). Among them, the smaller the noise sound power, the better the noise reduction effect. According to the data given in the figure, it can be obtained that when the position of the ventilation holes 312 coincides with the projection of the inlet end of the adjacent first blade 311 in the first direction, that is, when the ventilation holes 312 are located at x3, at this time the noise sound power is 99.3, and when the position of the ventilation holes 312 is just outside the projection of the inlet end of the adjacent first blade 311 in the first direction, that is, when the ventilation holes 312 are located at x4, at this time the noise sound power is 99.3, and its noise reduction effect is the best.

[0047] Please refer to Figure 1, in some embodiments, the diffuser 30 further includes a second diffuser 32 and a third diffuser 33. The second diffuser 32 includes an annular side wall 321 and a plurality of second vanes 322. The plurality of second vanes 322 are circumferentially arranged along the inner wall of the annular side wall 321. The annular side wall 321 is further connected to the housing 10. The third diffuser 33 is located between the second diffuser 32 and the first diffuser 31, and the third diffuser 33 has a plurality of third vanes 331. Specifically, as Figure 7 shown, the second diffuser 32 further includes a first inner connection ring 323. The first inner connection ring 323 is sleeved outside the motor 20. One end of the second vane 322 is connected to the annular side wall 321, and the other end is connected to the first inner connection ring 323. As Figure 8 shown, the third diffuser 33 further includes a second inner connection ring 332. The second inner connection ring 332 is sleeved outside the motor 20. The plurality of third vanes 331 are circumferentially arranged along the outer wall of the second inner connection ring 332. The cross sections of the second vanes 322 and the third vanes 331 are both arc-shaped, and the second vanes 322 and the third vanes 331 are both inclined relative to the output shaft 21. The blower 100 in this embodiment adopts a three-stage pressure boosting method, further reducing the air flow velocity when the air flows out of the diffuser 30, thereby suppressing broadband noise.

[0048] Specifically, the inlet angle refers to the angle between the vane surface and the inlet air flow, and the outlet angle refers to the angle between the vane surface and the outlet air flow. The magnitudes of both depend on the vane design and operating conditions. By adjusting the inlet and outlet angles of the vanes, the air flow process can be optimized, the occurrence of turbulence and eddy currents can be reduced, and the suction and performance of the vacuum cleaner can be improved. At the same time, the generation of noise can be reduced, and the comfort and service life of the vacuum cleaner can be improved. Usually, the larger the inlet angle, the larger the outlet angle will be accordingly. This is because during operation, the angular momentum of the inlet flow needs to match the angle of the vane to achieve the best pressure boosting effect.

[0049] In some embodiments, the end surface of the outlet end of the first vane 311 is coplanar with the end surface of the inlet end of the third vane 331, and the end surface of the outlet end of the third vane 331 is coplanar with the end surface of the inlet end of the second vane 322. Specifically, the end surfaces of the inlet and outlet ends of the first vane 311, the second vane 322, and the third vane 331 are all flat surfaces. Such a setting can reduce the occurrence of these turbulences and eddy currents, improve the performance of the vacuum cleaner; reduce the loss of air flow, thereby improving the suction of the vacuum cleaner; and can reduce the disturbance of air flow and the generation of noise. It can reduce the friction and impact of air flow, reduce the wear on the vanes and the entire vacuum cleaner, and thus extend the service life of the vacuum cleaner.

[0050] In some embodiments, the annular side wall 321 is connected to the housing 10 by an interference fit. Specifically, the housing 10 is sleeved on the annular side wall 321. A connection groove 3211 is provided at the edge of the annular side wall 321. The inner side wall of the housing 10 abuts against the bottom wall of the connection groove 3211, and the end face of the housing 10 abuts against the side wall of the connection groove 3211. The outer surface of the housing 10 is coplanar with the outer wall surface of the annular side wall 321. The diameter of the circle where the inner side wall of the housing 10 is located is slightly smaller than the diameter of the circle where the bottom wall of the connection groove 3211 is located, so that an interference fit connection is formed between the annular side wall 321 and the housing 10. With such a setting, a seal can be formed between the annular side wall 321 and the housing 10, thereby guiding the air flow to the second diffuser 32 and the third diffuser 33 and avoiding noise caused by air leakage.

[0051] In some embodiments, the annular side wall 321 forms a cavity 324, and the third diffuser 33 is located in the cavity 324. Specifically, the cavity 324 is used to extend and expand the first cavity 324, that is, to expand the cavity volume of the diffuser. In other embodiments, the third diffuser 33 can also be arranged in the first cavity 324, and the specific arrangement can be selected according to actual production or assembly requirements.

[0052] Please refer to Figure 7 and Figure 8 , in some embodiments, the second diffuser 32 is provided with a support frame 325, the support frame 325 is connected to the motor 20, and the third diffuser 33 is provided with a fixing groove 3321, and the fixing groove 3321 is matched with the support frame 325. Specifically, the support frame 325 includes a fixing ring 3251 and support feet 3252 uniformly connected to the circumferential side of the fixing ring 3251. The fixing ring 3251 is sleeved outside the output shaft 21 and does not contact the output shaft 21. The support feet 3252 are connected to the first inner connection ring 323. A limiting boss 3231 extending downward along the direction of the support feet 3252 is further provided at the connection between the first inner connection ring 323 and the fixing frame. With such a setting, the connection strength between the support feet 3252 and the first inner connection ring 323 can be enhanced. A limiting groove 22 matching the limiting boss 3231 is provided on the side of the motor 20, as Figure 2 shown, which is used to cooperate with the limiting boss 3231 to realize the limitation of the second diffuser 32 and prevent the second diffuser 32 from rotating under the drive of air. A fixing groove 3321 is formed on the second inner connection ring 332 of the third diffuser 33, and the fixing groove 3321 is arranged corresponding to the position of the support feet 3252 of the support frame 325. When the third diffuser 33 is arranged in the cavity 324, the fixing groove 3321 is stuck on the support feet 3252 to prevent the third diffuser 33 from rotating under the drive of air and generating noise.

[0053] Please refer to Figure 3, in some embodiments, the first diffuser 31 further includes a first connecting portion 313. The first connecting portion 313 is connected to the support frame 325, and a plurality of first vanes 311 are circumferentially arranged along the outer edge of the first connecting portion 313. Specifically, an avoidance hole 3131 is provided in the middle of the first connecting portion 313. The avoidance hole 3131 is used to avoid the fixing ring 3251 of the second diffuser 32. Three stepped slot holes 3132 are uniformly arranged around the avoidance hole 3131. The first connecting portion 313 is detachably connected to the support frame 325 through fasteners passing through the stepped slot holes 3132. The end face of the first diffuser 31 close to the air inlet 11 is coplanar with the inlet end of the first vane 311. Such a setting can prevent the first diffuser 31 from rotating under the drive of air, causing the first diffuser 31 to fail.

[0054] Please refer to Figure 2 and Figure 6 , in some embodiments, the first diffuser 31 further includes a plurality of fourth vanes 314. Each fourth vane 314 is connected to the air outlet end of a first vane 311. A drainage gap 315 is formed between two adjacent fourth vanes 314. The fourth vanes 314 are connected to the first vanes 311 in a one-to-one correspondence. The plurality of fourth vanes 314 enclose a second accommodation space 316. The drainage gap 315 is communicated with the second accommodation space 316. Among them, the fourth vanes 314 start from the edge of the first connecting portion 313 and bend towards the inside of the first connecting portion 313. Projecting along the diameter direction of the first connecting portion 313, at least part of two adjacent fourth vanes 314 overlap. The second accommodation space 316 is used to arrange the motor 20. Specifically, part of the coil winding 23 of the motor 20 is inside the second accommodation space 316. When air enters the motor 20 along the air inlet 11, it flows along the windward surface of the first vane 311. Part of the air will flow into the second accommodation space 316 along the drainage gap 315 and directly blow towards the coil winding 23 of the motor 20, thereby cooling the previous winding, avoiding overheating and malfunction or even scrapping of the motor 20, and improving the service life of the blower 100.

[0055] Furthermore, the inner surface of the fourth vane 314 is communicated with the leeward surface of the first vane 311, and the outer surface of the fourth vane 314 is communicated with the windward surface of the first vane 311. Such a setting can ensure that air flows into the second accommodation space 316 along the drainage gap 315 without any obstruction, avoiding unnecessary collision and friction between the high-speed flowing air and the vanes, thereby improving the service life of the vanes and avoiding unnecessary vibration to reduce noise generation.

[0056] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the said features. In the description of the present application, "a plurality" means at least two, for example two, three, unless otherwise specifically and clearly defined.

[0058] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fan, characterized in that, Comprising: A housing, the housing being formed with a first accommodating space and an air inlet communicating with the first accommodating space; A motor, at least a part of the motor being disposed in the first accommodating space; A diffuser, the diffuser being sleeved on the motor and connected to the motor. The diffuser includes a first diffuser, the first diffuser being located in the first accommodating space. The first diffuser has a plurality of first blades, and each first blade includes a windward surface and a leeward surface arranged opposite to each other. Each first blade is provided with a ventilation hole communicating the windward surface and the leeward surface.

2. The blower according to claim 1, characterized in that, The projections of two adjacent first blades in a direction perpendicular to the windward surface at least partially overlap, and the position of the ventilation hole coincides with the projection of the inlet end of the adjacent first blade in a direction perpendicular to the windward surface.

3. The fan according to claim 1, characterized in that, The diffuser further includes: A second diffuser, the second diffuser including an annular side wall and a plurality of second blades, the plurality of second blades being circumferentially arranged along the inner wall of the annular side wall, and the annular side wall is further connected to the housing; or The diffuser further includes: A third diffuser, the third diffuser being located between the second diffuser and the first diffuser, and the third diffuser has a plurality of third blades.

4. The blower according to claim 3, wherein The end surface of the outlet end of the first blade is coplanar with the end surface of the inlet end of the third blade, and the end surface of the outlet end of the third blade is coplanar with the end surface of the inlet end of the second blade.

5. The blower according to claim 3, wherein, The annular side wall is connected to the housing by interference fit.

6. The fan according to claim 3, characterized in that, The annular side wall forms a cavity, and the third diffuser is located in the cavity.

7. The blower according to claim 3, characterized in that, The second diffuser is provided with a support frame, the support frame is connected to the motor, and the third diffuser is provided with a fixing groove, and the fixing groove matches the support frame.

8. The fan according to claim 7, characterized in that, The first diffuser further includes a first connecting portion, the first connecting portion is connected to the support frame, and the plurality of first blades are circumferentially arranged along the outer edge of the first connecting portion.

9. The fan according to claim 1, characterized in that, The first diffuser further includes a plurality of fourth blades, each fourth blade is connected to the air outlet end of a first blade, a drainage gap is formed between two adjacent fourth blades, the fourth blades are connected to the first blades in one-to-one correspondence, and the plurality of fourth blades enclose a second accommodating space, and the drainage gap communicates with the second accommodating space.

10. The blower according to claim 9, wherein The inner surface of the fourth blade communicates with the leeward surface of the first blade, and the outer surface of the fourth blade communicates with the windward surface of the first blade.

11. A floor cleaning device, characterized in that, Including the blower according to any one of claims 1-10.

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