A fan noise reduction assembly and a scrubber

Abstract

The utility model provides a kind of fan noise reduction assembly and scrubber, belong to cleaning equipment technical field, the fan noise reduction assembly includes: shell, and air inlet passage and air outlet passage are equipped on shell;Fan body and flow guide cover are equipped in shell, the flow guide cover with the shell forms first chamber;The fan body includes air intake and air outlet, the air outlet is located below the flow guide cover, and the air intake with the air inlet passage abuts;Air current enters from the air inlet passage of shell, then passes through the air intake of fan body, discharges from the air outlet, air current flows towards the direction of flow guide cover, under the guidance of the flow guide cover, change the flow trajectory of air current in the first chamber, and then discharge from the air outlet passage.This scheme is guided to air current by setting flow guide cover, play the buffering and direction-changing effect to air current, make wind more smoothly, reduce the impact of air current and side wall, effectively reduce the noise when fan works.

Description

Technical Field

[0001] This utility model relates to the field of cleaning equipment technology, and in particular to a fan noise reduction component and a floor scrubber. Background Technology

[0002] As living standards improve, people have increasingly higher requirements for floor cleaning. Currently, the market offers a variety of surface cleaning equipment, such as vacuum cleaners, floor scrubbers, and steam mops, to meet diverse needs. Floor scrubbers, in particular, are convenient and quick, as they can both collect dirt and perform wet cleaning on the surface.

[0003] In the market, surface cleaning equipment mainly uses fans as a power source to generate suction airflow to clean stains, dust, mites, and other contaminants from object surfaces. However, fans generate noise due to vibration during operation, and the high-speed airflow also produces noise, resulting in a less than ideal user experience. To address the issue of excessive noise from surface cleaning equipment, the market typically uses special soundproof covers or sound-absorbing cotton to reduce noise. However, this design method is complex, has high design requirements, and its noise reduction effect is limited. Utility Model Content

[0004] To address the shortcomings of the aforementioned technologies, this utility model provides a fan noise reduction component that is simple in structure, easy to manufacture, and resource-saving, and can effectively reduce the noise of surface cleaning equipment during operation.

[0005] On one hand, this utility model provides a fan noise reduction component, including: a housing with an air inlet channel and an air outlet channel; a fan body and a guide shroud disposed within the housing, the guide shroud forming a first chamber with the housing; the fan body includes an air intake and an air outlet, the air outlet being located below the guide shroud, the air intake abutting against the air inlet channel; airflow enters from the air inlet channel of the housing, then passes through the air intake of the fan body, and exits from the air outlet, the airflow flowing towards the guide shroud, and under the guidance of the guide shroud, the flow trajectory of the airflow in the first chamber is changed, and then it is discharged from the air outlet channel.

[0006] This solution guides the airflow by setting up a deflector in conjunction with the fan body and casing, changing the airflow direction to make it smoother, buffering the airflow, and reducing the impact of the airflow on the side walls, thereby reducing noise. Secondly, the first chamber formed by the deflector and casing allows the airflow to interfere with each other and cancel each other out within the first chamber, reducing the sound of the airflow and achieving the purpose of noise reduction.

[0007] The air deflector has an arc-shaped guide section located near the fan body. This arc-shaped guide section is positioned above the air outlet. Airflow exiting from the fan body's outlet blows towards the arc-shaped guide section, changing its direction. This design, by incorporating the arc-shaped guide section, better guides the airflow. The arc design allows the airflow to smoothly change direction when it hits the air deflector, reducing collisions with the sidewalls of the casing and achieving better noise reduction.

[0008] Optionally, the shroud at least partially abuts against the sidewall of the housing in the circumferential direction.

[0009] Optionally, the flow guide shroud has a through hole, and the fan body passes through the through hole.

[0010] Optionally, a limiting member is provided circumferentially on the inner wall of the through hole. The limiting member is annular and is connected to the inner wall of the through hole by several connecting members. The connecting members divide the space between the limiting member and the inner wall of the through hole into several second chambers. The top of the limiting member is lower than the horizontal height of the top of the shock-absorbing part, and is used to limit the fan body.

[0011] Optionally, the fairing includes a flow guide and a shock absorber connected to each other.

[0012] Optionally, the shock-absorbing part is provided with a plurality of grooves, which are arranged in a honeycomb pattern on the shock-absorbing part.

[0013] Optionally, the inner surface of the bottom of the housing is provided with at least one continuously tortuous baffle, which divides the first chamber into a first flow channel space and a second flow channel space.

[0014] Optionally, the inner surface of the bottom of the housing is provided with two continuously tortuous baffles, which divide the first chamber into a first flow channel space, a second flow channel space, and a third flow channel space.

[0015] Optionally, the air outlet channel of the housing is a plurality of funnel-shaped holes.

[0016] Optionally, the bottom of the fan body is provided with a first sound-absorbing pad to reduce the noise generated by fan vibration; the first sound-absorbing pad is a ring structure with a closed bottom part, and its bottom inner diameter is smaller than its top inner diameter; Optionally, the first sound-absorbing pad has two sets of protruding ribs along its bottom circumference, namely a first protruding rib and a second protruding rib. The first protruding rib is connected to both the side wall and the bottom inner wall of the first sound-absorbing pad, and the second protruding rib is connected to the bottom inner wall of the first sound-absorbing pad. The first protruding rib and the second protruding rib are connected by a connecting part. Optionally, the edge of the air intake of the fan body is tightly connected to the edge of the unsealed channel at the bottom of the first sound-absorbing pad, and both the first and second protruding ridges are in close contact with the bottom of the fan body.

[0017] Optionally, the top of the fan body is also provided with a second sound-absorbing pad. The second sound-absorbing pad is an annular structure with a closed top part. Several annular grooves are provided on the closed top wall. Several transverse ribs are provided on the annular grooves to divide the annular grooves into several third chambers.

[0018] On the other hand, this utility model also provides a floor scrubber, including a handle, a floor scrubber body and a mop head, wherein the floor scrubber body includes the aforementioned fan noise reduction component.

[0019] The fan noise reduction component provided by this utility model has the following beneficial effects: First, by setting a guide shroud in conjunction with the fan body and casing, the airflow is guided, the airflow direction is changed to be smoother, the airflow is buffered, and the impact between the airflow and the side wall is reduced, thereby reducing noise; Second, through the first chamber formed by the guide shroud and the casing, the airflow interferes with each other and cancels each other out in the first chamber, reducing the sound of the airflow and achieving the purpose of noise reduction; Furthermore, the labyrinth array inside the casing causes the airflow to continuously hit the wall surface and be reflected in the labyrinth channel, which is forcibly dispersed, slowed down, and changed in direction. The sound waves of different paths interfere with each other and cancel each other out, weakening the airflow. Most of the mid-to-high frequency noise and turbulence noise are significantly attenuated, and the airflow is also stabilized to a certain extent, thereby reducing noise pollution. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of a fan noise reduction component according to an embodiment of the present invention; Figure 2 This is a connection diagram of the fan noise reduction component in one embodiment of the present utility model; Figure 3 for Figure 2 Schematic diagram of the vertical cross-section structure; Figure 4 for Figure 1 Enlarged schematic diagram of the central fairing; Figure 5 This is a schematic diagram of the cross section after the air guide is connected to the fan body; Figure 6 for Figure 1 Schematic diagram of the internal structure of the middle shell; Figure 7 for Figure 1 Schematic diagram of the structure of the first sound-absorbing pad; Figure 8 for Figure 1 Schematic diagram of the structure of the second sound-absorbing pad; Figure 9for Figure 1 A schematic diagram of the internal structure of the middle shell from another angle; Figure 10 This is a schematic diagram of the floor scrubber in Example 4.

[0021] The reference numerals in the figure are as follows: 10-shell, 101-air inlet channel, 102-air outlet channel, 103-baffle, 1031-first flow channel space, 1032-second flow channel space, 1033-third flow channel space, 110-first chamber, 20-fan body, 201-air inlet, 202-air outlet, 30-guide shroud, 302-arc-shaped guide shroud, 303-limiting component, 304-connector, 305-second chamber, 310-shock absorber, 320-guide component, 330-through hole, 40-first sound-absorbing pad, 410-first protruding ridge, 420-second protruding ridge, 430-connector, 50-second sound-absorbing pad, 510-annular groove, 520-rib. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0026] Please refer to the attached document. Figure 1-2 This application provides a fan noise reduction component for use in surface cleaning equipment, including common commercially available floor scrubbers, robotic vacuum cleaners, vacuum cleaners, mite removers, and other similar devices. The fan noise reduction component is used to reduce the noise generated by the surface cleaning equipment, thereby improving the user experience.

[0027] In the embodiments of this application, the fan noise reduction component includes: a housing 10, which serves to house the fan body and form an airflow channel. The bottom wall or peripheral wall of the housing 10 is provided with an air inlet channel 101 and an air outlet channel 102. The air inlet channel 101 is for airflow to pass through, and the air outlet channel 102 is for discharging the airflow from the housing 10. The housing 10 can be divided into an upper housing and a lower housing. The upper housing can be formed by a peripheral wall; the lower housing is formed by a peripheral wall and a bottom wall, with an installation space defined between the peripheral wall and the bottom wall. The fan body 20 can be detachably installed within the installation space of the housing 10 to draw in airflow and form an airflow channel. The fan body 20 includes an air inlet 201 and an air outlet 202. The air inlet can directly abut against the air inlet channel, or it can be simply abutted against it.

[0028] A detachable air guide shroud 30 is installed inside the housing 10. The air outlet 202 of the fan body 20 is located below the air guide shroud 30. The air guide shroud 30 can be made of a flexible material. Utilizing its flexibility and recoverability, it can effectively guide airflow and buffer vibration, thereby achieving the purpose of noise reduction. Materials that can be selected include rubber, silicone, etc. In other embodiments, the air guide shroud 30 can also be made of a plastic material. The air guide shroud 30 made of a plastic material can not only guide airflow but also buffer the operating vibration of the fan body 20, thus having a good noise reduction effect. The air guide shroud 30 can be integrally injection molded from silicone or plastic, or it can be formed by connecting several parts together.

[0029] In this embodiment, the air guide shroud 30 and the housing 10 form a first chamber 110, and the fan body is at least partially located in the first chamber 110. When the fan noise reduction component starts working, the airflow enters from the air inlet channel 101 of the housing 10, then passes through the air intake 201 of the fan body 20, and is discharged from the air outlet 202. The airflow flows towards the air guide shroud 30, and under the guidance of the air guide shroud 30, the flow trajectory of the airflow in the first chamber 110 is changed, and then it is discharged from the air outlet channel 102. When the equipment is working normally, the airflow discharged from the air outlet channel 102 is discharged to the outside through the gap between the sewage tank and the main body. By guiding the airflow through the air guide shroud 30, the mutual collision between gases is reduced, and the noise is effectively reduced. Example

[0030] Based on Example 1, please refer to the appendix. Figure 2 and attached Figure 3 The main difference of the fan noise reduction component provided in this embodiment is that the air guide shroud 30 is provided with an arc-shaped guide portion 302 near the fan body 20, and the arc-shaped guide portion 302 is located above the air outlet 202 of the fan body 20; the side of the arc-shaped guide portion 302 near the fan body 20 is the lower end of the arc shape, and the side away from the fan is the upper end of the arc shape; in some other embodiments, the positions of the upper and lower ends of the arc-shaped guide portion 302 can be interchanged, or there can be no distinction between the upper and lower ends, and the heights of both ends are the same.

[0031] The size of the arc-shaped guide portion 302 can be determined according to the distance between the guide shroud 30 and the air outlet 202 of the fan body 20. Relatively speaking, the closer the guide shroud 30 is to the air outlet 202 of the fan body 20, the smaller the arc of the arc-shaped guide portion; the farther the guide shroud 30 is from the air outlet 202 of the fan body 20, the larger the arc of the arc-shaped guide portion 302, or the farther the guide shroud 30 is from the air outlet 202 of the fan body 20, the farther the arc-shaped guide portion 302 is from the fan body 20. The arc-shaped guide portion 302 described in this embodiment includes arcs, semi-arcs, U-shapes formed by multiple arc designs, or other irregular shapes. The arc-shaped guide portion 302 has a circular or elliptical design on the guide shroud 30, which has a better air guiding effect.

[0032] The specific airflow process of the noise reduction component during operation is as follows: the airflow enters from the air inlet channel 101 of the housing 10, then enters the air intake 201 of the fan body 20, and is discharged from the air outlet 202. The airflow flows towards the guide shroud 30. Under the guidance of the arc-shaped guide part 302 of the guide shroud 30, the flow trajectory of the airflow in the first chamber 110 is changed, and then it is discharged from the air outlet channel 102. When the equipment is working normally, the airflow discharged from the air outlet channel 102 is discharged to the outside through the gap between the sewage tank and the main body. In this embodiment, the airflow at the air outlet 202 of the fan body 20 can change direction more smoothly under the action of the arc-shaped guide part 302, reducing its collision with the inner wall of the housing 10, reducing the generation of noise, and achieving the purpose of further noise reduction. Example

[0033] This embodiment provides a fan noise reduction component, see attached document. Figure 1-9 The device includes: a housing 10 for mounting a fan body 20 and a flow guide 30; the housing 10 has an air inlet channel 101 and an air outlet channel 102 on its peripheral wall and / or bottom wall; the fan body 20 for forming an airflow channel; the fan body 20 includes an air inlet 201 and an air outlet 202, the air outlet 202 being located below the flow guide 30, and the air inlet 201 abutting against the air inlet channel 101; the flow guide 30 is integrally injection molded from silicone or plastic material; the flow guide and the housing form a first chamber.

[0034] In this embodiment, the working state of the fan noise reduction component is as follows: the airflow enters from the air inlet channel 101 of the housing 10, then passes through the air intake 201 of the fan body 20, and is discharged from the air outlet 202. The airflow flows towards the direction of the guide shroud 30, enters the first chamber 110 under the guidance of the guide shroud 30, and is then discharged from the air outlet channel 102.

[0035] To save space and reduce noise from fan vibration, refer to Figure 4 and Figure 5 The shroud 30 is at least partially in contact with the side wall of the housing 10 in the circumferential direction. The shroud 30 may be provided with a through hole 330, and the fan body 20 may be inserted into the through hole 330. The top diameter of the through hole 330 may be larger than the bottom diameter, or the top diameter of the through hole 330 may be equal to the bottom diameter. The through hole 330 is designed to be snapped into the fan body 20. The diameter of the through hole 330 is set to be larger at the top and smaller at the bottom to improve the fit and shock absorption effect between the fan body 20 and the shroud 30, thereby improving the noise reduction effect.

[0036] In a preferred embodiment, to further improve the noise reduction effect, save resources, and improve the heat dissipation effect of the fan, refer to Figure 4The flow guide shroud 30 may include a flow guide section 320 and a shock absorber section 310 that are interconnected or integrally formed. The flow guide section 320 guides the airflow, and the shock absorber section 310 reduces the noise of the fan body 20 during operation. The shock absorber section 310 is provided with a plurality of grooves, which may be circular blind holes of the same shape and size, or strip holes of different shapes and sizes, or other irregular shapes. The grooves can be arranged in a honeycomb pattern on the damping part 310, or the grooves can be symmetrically arranged on the damping part 310 along the central axis; the volume and / or shape of the grooves may include at least two types to correspond to more noise peak frequencies and further reduce noise; the lateral area of ​​the flow guide part 320 may be greater than or equal to the lateral area of ​​the damping part 310, and the through hole 330 on the flow guide cover 30 penetrates the flow guide part 320 and the damping part 310. In one embodiment, the through hole 330 is located in the middle of the relative position of the flow guide cover 30; when the flow guide part 320 of the flow guide cover 30 is installed downwards, the damping part 310 is installed upwards. In other embodiments, the installation directions of the flow guide part 320 and the damping part 310 may be interchanged.

[0037] In this embodiment, to further improve the noise reduction effect, an arc-shaped guide portion 302 is provided near the through hole 330 of the air guide portion 320. The arc-shaped guide portion 302 has a lower arc end on the side near the through hole 330 and a higher arc end on the side away from the fan. The airflow enters from the air inlet channel 101 of the housing 10, then passes through the air intake 201 of the fan body 20 and is discharged from the air outlet 202. The airflow flows towards the air guide shroud 30. Under the guidance of the arc-shaped guide portion 302 of the air guide shroud 30, the flow trajectory of the airflow in the first chamber 110 is changed, reducing its collision with the inner wall of the housing 10. This allows for very smooth airflow reversal, reducing noise generation and achieving further noise reduction.

[0038] refer to Figure 4 The inner wall of the through hole 330 may also be provided with a limiting member 303. The limiting member 303 is annular and is connected to the inner wall of the through hole 330 by several connecting members 304. The connecting members 304 divide the space between the limiting member 303 and the inner wall of the through hole 330 into several second chambers 305. The top of the limiting member 303 is lower than the top horizontal height of the shock absorber 310, which is used to limit the fan body 20. The several second chambers 305 can buffer the vibration of the fan body 20 during operation and further reduce noise.

[0039] refer to Figure 6The inner surface of the bottom of the housing 10 is provided with at least one continuously tortuous baffle 103, which divides the first chamber 110 into a first flow channel space 1031 and a second flow channel space 1032. In a preferred embodiment, the inner surface of the bottom of the housing 10 is provided with two continuously tortuous baffles 103, which are symmetrically arranged along the central axis. The two baffles 103 divide the first chamber 110 into a first flow channel space 1031, a second flow channel space 1032, and a third flow channel space 1033. Accordingly, the number of tortuous baffles 103 can be increased or decreased according to actual needs. The shape and size of the multiple baffles 103 can be the same or different, which will not be elaborated here. By designing the tortuous baffles 103, the airflow is forced to not pass through in a straight line. The airflow continuously hits the wall surface and is reflected in the tortuous flow channel space. The sound waves of different paths interfere with each other, cancel each other out, and weaken each other, thereby achieving the purpose of noise reduction. In one embodiment, the continuously tortuous baffles 103 form a maze array for noise reduction. The maze array can be a snail maze array, that is, the continuously tortuous baffles 103 form a flow channel space shaped like a snail. The snail maze array is symmetrical about the central axis. In other embodiments, the continuously tortuous baffles 103 can also be designed in other common vortex or wave shapes.

[0040] In this embodiment, reference Figure 6 To further reduce noise, the air outlet channel 101 of the housing 10 consists of several funnel-shaped holes. These funnel-shaped holes form a large inlet and a small outlet for the airflow. This design suppresses eddy noise at its source, enhances high-frequency sound energy dissipation, and maintains low wind resistance and high flow rate. The funnel-shaped hole structure in this embodiment further disperses the airflow into a large number of low-speed micro-airflows. Through streamlined airflow guidance and gradual changes in acoustic impedance, the remaining high-frequency noise and any potential jet noise are effectively attenuated, achieving the goal of noise reduction. The number and / or position of the funnel-shaped holes can be symmetrically arranged along the central axis at the bottom of the housing 10, or they can be arranged irregularly.

[0041] In a preferred embodiment, a first sound-absorbing pad 40 is provided at the bottom of the fan body 20, as shown in the reference. Figure 7The first sound-absorbing pad 40 is disposed between the fan body 20 and the air inlet channel of the housing 10, and fits tightly therewith, serving to seal, buffer vibration, and reduce noise. The first sound-absorbing pad 40 can be designed as a closed annular structure at the bottom, with its bottom inner diameter smaller than its top inner diameter. Two sets of protruding ribs, namely the first protruding rib 410 and the second protruding rib 420, are provided circumferentially along the bottom of the first sound-absorbing pad 40. The first protruding rib 410 connects to both the side wall and the bottom inner wall of the first sound-absorbing pad 40, and the second protruding rib 420 connects to the bottom inner wall of the first sound-absorbing pad 40. The first protruding rib 410 and the second protruding rib 420 are connected by a connecting part 430. The edge of the air inlet 201 of the fan body 20 is tightly connected to the edge of the unclosed channel at the bottom of the first sound-absorbing pad 40, and both the first protruding rib 410 and the second protruding rib 420 are in close contact with the bottom of the fan body 20.

[0042] A second sound-absorbing pad 50 can also be installed on the top of the fan body, for reference. Figure 8 The second sound-absorbing pad 50 is a closed annular structure at the top. Several annular grooves 510 are provided on the closed top wall, and several transverse ribs 520 are provided on the annular grooves 510, dividing the annular grooves 510 into several third chambers. The second sound-absorbing pad 50 is located on the top of the fan body 20, serving to buffer vibration and reduce noise. At the same time, the groove design of the second sound-absorbing pad 50 saves resources and improves the heat dissipation effect on the fan body. Example

[0043] This embodiment provides a floor scrubbing machine, see reference. Figure 10 The system mainly includes a handle, a floor scrubber body, and a mop head. The floor scrubber body includes the aforementioned fan noise reduction component. The handle and mop head are respectively located at both ends of the floor scrubber body. The handle includes a grip portion and a slender rod, which can be a telescopic rod or a non-telescopic straight rod. The slender rod can also pivot or bend relative to the body. The floor scrubber body is equipped with a clean water tank, a wastewater tank, and the fan noise reduction component. The mop head is equipped with a roller brush for cleaning the floor.

[0044] During operation, the clean water tank supplies clean water to the roller brush to clean the floor. The fan noise reduction component activates, and the fan itself turns on to generate a suction airflow that draws the cleaned wastewater into the duct and ultimately into the wastewater tank. In the wastewater tank, the dirt undergoes gas-liquid separation, and the gas is expelled from the equipment by the motor. The floor scrubber provided in this embodiment, with the assistance of the fan component, has the advantages of strong suction, low energy consumption, and low noise.

[0045] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A fan noise reduction component, characterized in that, include: The casing is equipped with an air inlet channel and an air outlet channel; A fan body and a guide shroud are disposed within the housing, the guide shroud and the housing forming a first chamber; The fan body includes an air inlet and an air outlet. The air outlet is located below the air guide shroud, and the air inlet abuts against the air inlet channel. Airflow enters through the air inlet channel of the housing, then passes through the air intake of the fan body and exits through the air outlet. The airflow flows toward the guide shroud, and under the guidance of the guide shroud, the flow trajectory of the airflow in the first chamber is changed, and then it is discharged from the air outlet channel.

2. The fan noise reduction component as described in claim 1, characterized in that, The air guide shroud is provided with an arc-shaped guide section near the fan body. The arc-shaped guide section is located above the air outlet. The airflow is discharged from the air outlet of the fan body and blows towards the arc-shaped guide section, changing the airflow direction under the action of the arc-shaped guide section.

3. The fan noise reduction component as described in claim 1 or 2, characterized in that, The shroud is at least partially in contact with the sidewall of the housing in the circumferential direction.

4. The fan noise reduction component as described in claim 1 or 2, characterized in that, The flow guide shroud has a through hole, and the fan body passes through the through hole.

5. The fan noise reduction component as described in claim 4, characterized in that, The inner wall of the through hole is provided with a limiting member in the circumferential direction. The limiting member is circular and is connected to the inner wall of the through hole by several connecting members. The connecting members divide the space between the limiting member and the inner wall of the through hole into several second chambers. The top of the limiting member is lower than the top horizontal height of the shock-absorbing part of the guide shroud, and is used to limit the fan body.

6. The fan noise reduction component as described in claim 1 or 2, characterized in that, The air deflector includes an air guiding section and a shock-absorbing section that are connected to each other.

7. The fan noise reduction component as described in claim 6, characterized in that, The shock-absorbing part is provided with a number of grooves, which are arranged in a honeycomb pattern.

8. The fan noise reduction component as described in claim 1 or 2, characterized in that, The bottom inner surface of the housing is provided with at least one continuously tortuous baffle, which divides the first chamber into a first flow channel space and a second flow channel space.

9. The fan noise reduction component as described in claim 8, characterized in that, The bottom inner surface of the shell is provided with two continuously curved baffles, which divide the first chamber into a first flow channel space, a second flow channel space and a third flow channel space.

10. The fan noise reduction component as described in claim 1 or 2, characterized in that, The air outlet channel of the shell is a number of funnel-shaped holes.

11. The fan noise reduction component as described in claim 1 or 2, characterized in that, The bottom of the fan body is provided with a first sound-absorbing pad to reduce the noise generated by fan vibration; the first sound-absorbing pad is a ring structure with a closed bottom part, and its bottom inner diameter is smaller than its top inner diameter. The first sound-absorbing pad has two sets of protruding ribs along its bottom circumference, namely the first protruding rib and the second protruding rib. The first protruding rib is connected to both the side wall and the bottom inner wall of the first sound-absorbing pad. The second protruding rib is connected to the bottom inner wall of the first sound-absorbing pad. The first protruding rib and the second protruding rib are connected by a connecting part. The edge of the air intake of the fan body is closely connected to the edge of the unsealed channel at the bottom of the first sound-absorbing pad, and the first and second protruding ridges are in close contact with the bottom of the fan body.

12. The fan noise reduction component as described in claim 11, characterized in that, The top of the fan body is also provided with a second sound-absorbing pad. The second sound-absorbing pad is a ring structure with the top part closed. Several ring grooves are provided on the closed top wall. Several transverse ribs are provided on the ring grooves, dividing the ring grooves into several third chambers.

13. A floor scrubber, comprising a handle, a scrubber body, and a mop head, characterized in that, The main body of the floor scrubber includes the fan noise reduction component as described in any one of claims 1-12.

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