Noise reduction components and sweeping robots

Abstract

The present invention discloses a noise reduction component and a sweeping robot, wherein the sweeping robot comprises a machine body and a fan body, a driving wheel assembly and a rolling brush assembly arranged on the machine body, and the noise reduction component comprises at least two of an air duct noise reduction structure, a fan noise reduction structure, a motor noise reduction structure and a gear drive noise reduction structure; the fan noise reduction structure is connected between the fan body and the machine body; the air duct noise reduction structure is arranged in the air duct of the fan body to silence and reduce the noise of the airflow in the air duct; the motor noise reduction structure is to set the motor of the fan body as a brushless motor; the gear drive noise reduction structure is arranged in the machine body, and the gear drive noise reduction structure forms a noise reduction cavity that isolates the gear set of the driving wheel assembly and / or the gear set of the rolling brush assembly. The technical solution of the present invention aims to reduce the noise generated when the sweeping robot is working, so as to improve the comfort of using the sweeping robot.

Description

Technical Field

[0001] The present invention relates to the technical field of sweeping robots, and in particular to a noise reduction component and a sweeping robot using the noise reduction component. Background Art

[0002] With the improvement of living standards, sweeping robots have been increasingly used in household cleaning operations. However, when sweeping robots are running, there are many situations where they generate loud noises due to air duct flow or fan operation, and the traditional method is usually to reduce noise by reducing the working efficiency of the fan, which has little effect and affects the usability of users.

[0003] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a noise reduction component, which is intended to reduce the noise generated when a sweeping robot is working.

[0005] To achieve the above-mentioned object, the noise reduction component proposed in the present invention is applied to a sweeping robot, the sweeping robot comprising a body and a fan body, a driving wheel assembly and a roller brush assembly arranged on the body, the noise reduction component comprising at least two of an air duct noise reduction structure, a fan noise reduction structure, a motor noise reduction structure and a gear drive noise reduction structure;

[0006] The fan noise reduction structure is connected between the fan body and the machine body;

[0007] The air duct noise reduction structure is arranged in the air duct of the fan body to reduce the noise of the airflow in the air duct;

[0008] The motor noise reduction structure is to set the motor of the fan body as a brushless motor;

[0009] The gear-driven noise reduction structure is disposed in the body, and the gear-driven noise reduction structure forms a noise reduction cavity that isolates the gear set of the driving wheel assembly and / or the gear set of the roller brush assembly.

[0010] In one embodiment of the present application, a mounting pin is protrudingly provided on the inner wall surface of the body, and the fan noise reduction structure includes a fixing member, which is connected to the periphery of the fan body, and the fixing member is connected to the mounting pin so that the fan body is fixed in the body and a gap is formed between the outer surface of the fan body and the inner wall surface of the body.

[0011] In an embodiment of the present application, the fan noise reduction structure further includes a flexible kit, and the flexible kit is sleeved on the outer surface of the fan body.

[0012] In one embodiment of the present application, the air inlet duct and the air outlet duct of the fan body are connected in a bent manner to form the air duct noise reduction structure, and the fan body also includes fan blades, and the extension directions of the air inlet duct and the air outlet duct are both located on the tangent of the centrifugal direction of the fan blades.

[0013] In one embodiment of the present application, the inner wall surface of the connection between the air inlet duct and the air outlet duct is arranged in a smooth transition.

[0014] In one embodiment of the present application, the air duct noise reduction structure further includes sound-absorbing cotton, and the sound-absorbing cotton is arranged on one side of the air outlet duct.

[0015] In one embodiment of the present application, the air duct noise reduction structure further includes breathable sound-absorbing cotton, and the breathable sound-absorbing cotton is embedded and sealed in the air outlet of the air outlet duct.

[0016] In one embodiment of the present application, the gear-driven noise reduction structure includes a gear box, and the gear box includes:

[0017] A housing, wherein the housing is provided with a clearance opening; and

[0018] A cover body is provided to cover and seal the clearance opening, the cover body cooperates with the shell to form the noise reduction cavity, and the gear set is arranged in the noise reduction cavity.

[0019] In one embodiment of the present application, the gear drive noise reduction structure further includes a lubricating member, and the lubricating member is used to lubricate the gear set;

[0020] And / or, the shell is recessed on the surface of the periphery of the clearance opening to form a limiting groove, and the cover body is convexly provided with a protruding block on the surface circumferentially facing the limiting groove, and when the cover body is connected to the shell, the protruding block abuts and is limited in the limiting groove.

[0021] The present application also proposes a sweeping robot, comprising a noise reduction component, wherein the noise reduction component comprises at least two of an air duct noise reduction structure, a fan noise reduction structure, a motor noise reduction structure, and a gear drive noise reduction structure;

[0022] The fan noise reduction structure is connected between the fan body and the machine body;

[0023] The air duct noise reduction structure is arranged in the air duct of the fan body to reduce the noise of the airflow in the air duct;

[0024] The motor noise reduction structure is to set the motor of the fan body as a brushless motor;

[0025] The gear-driven noise reduction structure is disposed in the body, and the gear-driven noise reduction structure forms a noise reduction cavity that isolates the gear set of the driving wheel assembly and / or the gear set of the roller brush assembly.

[0026] The noise reduction component of the technical solution of the present invention is applied to a sweeping robot to reduce the noise generated during the working process of the sweeping robot. The noise reduction component includes at least two of an air duct noise reduction structure, a fan noise reduction structure, a motor noise reduction structure, and a gear drive noise reduction structure, wherein the fan noise reduction structure is connected between the fan body and the body to reduce the noise of the fan body through vibration reduction. The air duct noise reduction structure is arranged in the air duct of the fan body to silence and reduce the noise of the air flow in the air duct, and the motor noise reduction structure is to set the motor of the fan body as a brushless motor. Since the brushless motor runs more smoothly than the brushed motor, the noise of the brushless motor is smaller. The gear drive noise reduction structure is arranged in the body, and the gear drive noise reduction structure forms a noise reduction cavity that isolates the gear set of the driving wheel assembly and / or the gear set of the roller brush assembly. In this way, the noise reduction component can reduce the noise generated during the working process of the sweeping robot through a variety of noise reduction methods, so as to further improve the noise reduction ability of the working process of the sweeping robot and improve the comfort of the use of the sweeping robot. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 This is a schematic structural diagram of an embodiment of a sweeping robot of the present invention;

[0029] Figure 2 This is a schematic diagram of the assembly structure of the sweeping robot of the present invention;

[0030] Figure 3 It is a partial structural schematic diagram of the noise reduction component of the present invention;

[0031] Figure 4 A schematic diagram of a portion of the structure of the noise reduction assembly of the present invention from another perspective;

[0032] Figure 5 It is a schematic diagram of the assembly structure of a part of the structure of the noise reduction component of the present invention;

[0033] Figure 6 It is a partial structural schematic diagram of the sweeping robot of the present invention;

[0034] Figure 7This is a schematic diagram of the assembly structure of the sweeping robot of the present invention;

[0035] Figure 8 A schematic structural diagram of a housing of a gear-driven noise reduction structure of a noise reduction assembly of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the cover body of the gear-driven noise reduction structure of the noise reduction assembly of the present invention.

[0037] Description of Figure Numbers:

[0038] Label name Label name 100 Robot Vacuum Cleaner 141a Give way 10 Noise reduction components 141b Limit slot 11 Fan noise reduction structure 1412 Cover 111 Fixings 141c Raised blocks 112 Flexible Kit 20 Body 12 Air duct noise reduction structure 30 Fan body 121 Sound-absorbing cotton 31 Air inlet duct 122 Breathable sound-absorbing cotton 32 Air outlet duct 13 Motor noise reduction structure 33 Fan blade 14 Gear drive noise reduction structure 40 Drive wheel assembly 141 Gearbox 41 Gear Set 1411 case 50 Roller brush assembly

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The present invention provides a noise reduction component 10. The noise reduction component 10 is applied to a cleaning robot 100. The cleaning robot 100 includes a body 20, a fan body 30, a driving wheel assembly 40 and a roller brush assembly 50 arranged on the body 20.

[0045] Reference Figures 1 to 3 , Figure 6 as well as Figure 7 In an embodiment of the present invention, the noise reduction component 10 includes at least two of an air duct noise reduction structure 12, a fan noise reduction structure 11, a motor noise reduction structure 13 and a gear drive noise reduction structure 14; the fan noise reduction structure 11 is connected between the fan body 30 and the machine body 20; the air duct noise reduction structure 12 is arranged in the air duct of the fan body 30 to silence and reduce the noise of the airflow in the air duct; the motor noise reduction structure 13 is for setting the motor of the fan body 30 as a brushless motor; the gear drive noise reduction structure 14 is arranged in the machine body 20, and the gear drive noise reduction structure 14 forms a noise reduction cavity that isolates the gear group 41 of the drive wheel assembly 40 and / or the gear group 41 of the roller brush assembly 50.

[0046] The shape of the body 20 can be designed to be circular. The body 20 is formed as the main body of the sweeping robot 100, and can provide installation and support for other components. The driving wheel assembly 40 and the roller brush assembly 50 of the sweeping robot 100 can be arranged at the bottom of the body 20, and the roller brush assembly 50 and the driving wheel assembly 40 are provided with a gear set 41 for transmission, so that the sweeping robot 100 can mop and clean the floor during the movement. An installation cavity is formed in the body 20, and the fan body 30 and the electric control components of the sweeping robot 100 can be installed in the installation cavity, and the fan body 30 is formed with an air duct, and the fan body 30 provides suction for sucking dust from the plane to be cleaned. Compared with the brushed motor, the brushless motor runs more smoothly, not only has less working noise, but also has a longer life. The brushless motor can be adjusted by multiple layers of dynamic balancing before being installed in the fan body 30 to further prevent the working noise of the brushless motor from being too loud. It should be noted that, in order to reduce costs, the noise reduction component 10 can be set with only two of the noise reduction modes or a combination of three noise reduction modes. Of course, in order to improve the user experience, the noise reduction component 10 can also be set with all the noise reduction modes at the same time to achieve the best noise reduction effect. The specific selection can be made by those skilled in the art.

[0047] The noise reduction component 10 of the technical solution of the present invention is applied to the sweeping robot 100 to reduce the noise generated during the working process of the sweeping robot 100. The noise reduction component 10 includes at least two of the air duct noise reduction structure 12, the fan noise reduction structure 11, the motor noise reduction structure 13 and the gear drive noise reduction structure 14, wherein the fan noise reduction structure 11 is connected between the fan body 30 and the body 20 to reduce the noise of the fan body 30 by vibration reduction. The air duct noise reduction structure 12 is arranged in the air duct of the fan body 30 to silence and reduce the noise of the air flow in the air duct, and the motor noise reduction structure 13 is to set the motor of the fan body 30 as a brushless motor. Since the brushless motor runs more smoothly than the brushed motor, the brushless motor runs with less noise. The gear drive noise reduction structure 14 is arranged in the body 20, and the gear drive noise reduction structure 14 forms a noise reduction cavity that isolates the gear set 41 of the driving wheel assembly 40 and / or the gear set 41 of the roller brush assembly 50. In this way, the noise reduction component 10 can reduce the noise generated during the working process of the cleaning robot 100 through a variety of noise reduction methods, so as to further improve the noise reduction capability during the working process of the cleaning robot 100 and improve the comfort of use of the cleaning robot 100.

[0048] In one embodiment of the present application, refer to Figures 3 to 5, the inner wall surface of the machine body 20 is convexly provided with a mounting pin, and the fan noise reduction structure 11 includes a fixing member 111, the fixing member 111 is connected to the periphery of the fan body 30, and the fixing member 111 is connected to the mounting pin (not shown), so that the fan body 30 is fixed in the machine body 20, and a gap is formed between the outer surface of the fan body 30 and the inner wall surface of the machine body 20. Specifically, the inner wall surface of the machine body 20 is convexly provided with a mounting pin, and the fixing member 111 is connected to the periphery of the fan body 30. By connecting the fixing member 111 with the mounting pin, not only the fan body 30 is fixed in the machine body 20, but also the outer surface of the fan body 30 and the inner wall surface of the machine body 20 have a gap, so that the fan body 30 can be suspended relative to the inner wall surface of the machine body 20, effectively preventing the fan body 30 from resonating with the inner wall surface of the machine body 20 during operation to generate noise, thereby improving the usability of the sweeping robot 100. Among them, the fixing member 111 can be a collar structure, a fastening structure, or a sleeve structure. It can be understood that when the fixing member 111 is a collar structure, the fixing member 111 can be sleeved on the mounting pin, and the inner wall surface of the collar structure abuts against the peripheral side wall of the mounting pin. It can be understood that the mounting sheath and the fixing member 111 can be provided with multiple, that is, the fixing member 111 is sleeved on the mounting pin, and a force point is formed between a fixing member 111 and a mounting pin, so that multiple force points are formed between the axial edge of the fan body 30 and the inner wall surface of the body 20, so as to increase the connection strength between the fan body 30 and the inner wall surface of the body 20, thereby further reducing the resonance between the fan body 30 and the inner wall surface of the body 20, and improving the working stability of the sweeping robot 100.

[0049] In addition, an elastic washer (not shown) may be sleeved on the mounting pin, and when the mounting pin is connected to the fixing member 111, the mounting pin part is inserted into the fixing member 111, so that the elastic washer is sandwiched between the mounting pin and the fixing member 111. It can be understood that by providing the elastic washer between the mounting pin and the fixing member 111, the elastic washer is used as a buffer to reduce the resonance between the fan body 30 and the inner wall surface of the body 20.

[0050] Furthermore, the fan noise reduction structure 11 also includes a flexible kit 112, and the flexible kit 112 is sleeved on the outer surface of the fan body 30. Specifically, the flexible kit 112 can be made of soft rubber materials such as silicone or rubber, so that the flexible kit 112 can be sleeved on the outer surface of the fan body 30, so as to achieve the effect of vibration reduction and noise reduction. In order to avoid occupying too much internal space of the body 20 of the sweeping robot 100, the flexible kit 112 can only wrap part of the structure of the fan body 30, or in order to achieve a better effect of vibration reduction and noise reduction, the flexible kit 112 can completely wrap the fan body 30. In addition, a plurality of flexible kits 112 can be provided, and the plurality of flexible kits 112 are arranged at intervals along the extension direction of the air duct of the fan body 30 to further improve the effect of vibration reduction and noise reduction.

[0051] In one embodiment of the present application, refer to Figures 3 to 6 , the air inlet duct 31 and the air outlet duct 32 of the fan body 30, the air inlet duct 31 and the air outlet duct 32 are bent and connected to form an air duct noise reduction structure 12, the fan body 30 also includes a fan blade 33, and the extension direction of the air inlet duct 31 and the extension direction of the air outlet duct 32 are both located on the tangent of the centrifugal direction of the fan blade 33. Specifically, by making the extension direction of the air inlet duct 31 and the extension direction of the air outlet duct 32 both located on the tangent of the centrifugal direction of the fan blade 33, the fan body 30 can take in or out air at the maximum speed, and at the same time, the air inlet duct 31 and the air outlet duct 32 are bent and connected to form the air duct noise reduction structure 12, so as to increase the length of the air duct, increase the transmission distance of the noise, and thus reduce the transmission of the noise. And the air inlet duct and the air outlet duct connected in a bent manner can effectively reduce the length occupied by the fan body 30, thereby reducing the occupied area of ​​the sweeping robot 100.

[0052] Furthermore, the inner wall surface of the connection between the air inlet duct 31 and the air outlet duct 32 is smoothly transitioned. Specifically, the inner wall surface of the connection between the air inlet duct 31 and the air outlet duct 32 is smoothly transitioned, so as to avoid the dead corner in the air duct and the vortex howling when the airflow passes through, thereby further silencing and reducing the noise of the airflow in the air duct.

[0053] Optionally, the air duct noise reduction structure 12 further includes sound-absorbing cotton 121, which is arranged on one side of the air outlet duct 32. The side wall of the air outlet duct 32 is provided with a mounting position, so that the sound-absorbing cotton 121 can be fixed to the mounting position by snap-fitting, so as to facilitate the disassembly and cleaning of the sound-absorbing cotton 121 in the later stage. At the same time, the sound-absorbing cotton 121 is arranged in the air duct so that part of the sound generated by the air flow in the air duct will be absorbed by the sound-absorbing cotton 121, so as to achieve the effect of silencing and reducing the air flow in the air duct. It can be understood that the sound-absorbing cotton 121 is installed in a position that does not affect the air flow, such as the side wall close to the air outlet of the air outlet duct 32, so that the normal flow of the air flow can be ensured, and the sound of the air flow can be reduced.

[0054] In one embodiment of the present application, refer to Figure 5The air duct noise reduction structure 12 also includes a breathable sound-absorbing cotton 122, which is embedded and sealed in the air outlet of the air outlet duct 32. Specifically, the breathable sound-absorbing cotton 122 can cover and seal the air outlet of the air outlet duct 32 in a detachable manner such as snap-on, so as to facilitate the disassembly and cleaning of the breathable sound-absorbing cotton 122 later. When the airflow is discharged from the air outlet, the breathable sound-absorbing cotton 122 can silence and reduce the noise of the airflow to reduce the noise of the sweeping robot 100 when it is working. At the same time, the breathable sound-absorbing cotton 122 will not affect the normal flow of the airflow. In addition, the breathable sound-absorbing cotton 122 can also prevent foreign matter from entering the air duct from the air outlet to ensure the normal use of the fan body 30.

[0055] In one embodiment of the present application, refer to Figure 2 , Figures 7 to 9 The gear driven noise reduction structure 14 includes a gear box 141, and the gear box 141 includes a shell 1411 and a cover 1412. The shell 1411 is provided with a clearance opening 141a; the cover 1412 is sealed on the clearance opening 141a, and the cover 1412 cooperates with the shell 1411 to form a noise reduction cavity, and the gear set 41 is arranged in the noise reduction cavity. Specifically, the shell 1411 is mainly used to support and protect the gear set 41, etc., and its shape can be adapted to the shape of the gear set 41. The gear set 41 can be placed into the shell 1411 from the clearance opening 141a, and then the cover 1412 is sealed on the clearance opening 141a of the shell 1411 to form a noise reduction cavity, and the noise reduction cavity can isolate the gear set 41 from the outside, thereby reducing the diffusion of the running noise of the gear set 41 to achieve the effect of noise reduction. It is understandable that the shell 1411 and the cover 1412 are provided with a through hole connected to the noise reduction chamber, and the through hole is only for the motor connecting shaft, the driving wheel connecting shaft and the roller brush connecting shaft to pass through. The material of the shell 1411 and the cover 1412 can be selected as plastic (such as ABS, POM, PS, PMMA, PC, PET, PBT, PPO, etc.), that is, it provides support and protection without making the weight of the sweeping robot 100 too heavy. In addition, the cover 1412 and the shell 1411 can be connected by a detachable connection method such as a snap connection or a threaded connection, which can be selected by those skilled in the art and will not be elaborated here.

[0056] Furthermore, the gear-driven noise reduction structure 14 also includes a lubricating part, which is used to lubricate the gear set 41; specifically, the lubricating part can be a liquid such as a lubricant, so that the rotation of the gears of the gear set 41 is easier and smoother, thereby avoiding the noise generated by the mutual interference between the gears of the gear set 41, improving the noise reduction capability of the working process of the sweeping robot 100, and improving the usability of the sweeping robot 100.

[0057] Optionally, the surface of the housing 1411 is concavely provided with a limiting groove 141b on the periphery of the opening 141a, and the cover 1412 is provided with a protruding block 141c on the periphery of the limiting groove 141b. When the cover 1412 is connected to the housing 1411, the protruding block 141c is abutted and limited in the limiting groove 141b. Specifically, the limiting groove 141b and the protruding block 141c are similar in shape. When the cover 1412 is connected to the housing 1411, the protruding block 141c is inserted into the limiting groove 141b, which not only makes the alignment of the cover 1412 and the housing 1411 simple to facilitate connection, but also strengthens the gap between the sealing housing 1411 and the cover 1412, further improves the sealing effect, and further reduces the diffusion of the running noise of the gear set 41, so as to improve the noise reduction effect.

[0058] Furthermore, a sealing member (not shown) may be provided between the cover 1412 and the housing 1411. After the cover 1412 and the housing 1411 are covered, the cover 1412 presses the sealing member to achieve a waterproof sealing effect. It is understood that the material of the sealing member may also be an elastic material such as plastic, silicone, or rubber, and the assembly between the sealing member and the cover 1412 and the housing 1411 is an interference fit, so the sealing member can form appropriate bending and deformation, and the side wall of the sealing member is squeezed with the material of the housing 1411, so as to ensure that the sealing achieves the best effect.

[0059] The present invention further proposes a sweeping robot 100, which includes a noise reduction component 10. The specific structure of the noise reduction component 10 refers to the above-mentioned embodiment. Since the sweeping robot 100 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0060] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A noise reduction component, applied to a sweeping robot, the sweeping robot comprising a body and a fan body, a driving wheel assembly and a roller brush assembly arranged on the body, characterized in that: The noise reduction component includes at least two of an air duct noise reduction structure, a fan noise reduction structure, a motor noise reduction structure, and a gear drive noise reduction structure; The fan noise reduction structure is connected between the fan body and the machine body; The air duct noise reduction structure is arranged in the air duct in the fan body to reduce the noise of the airflow in the air duct; The motor noise reduction structure is to set the motor of the fan body as a brushless motor; The gear-driven noise reduction structure is disposed in the body, and the gear-driven noise reduction structure forms a noise reduction cavity that isolates the gear set of the driving wheel assembly and / or the gear set of the roller brush assembly; The fan body includes an air inlet duct and an air outlet duct, wherein the air inlet duct is bent and connected to the air outlet duct to form the air duct noise reduction structure, and the fan body further includes a fan blade, and the extension direction of the air inlet duct and the extension direction of the air outlet duct are both located on a tangent line of the centrifugal direction of the fan blade; The gear-driven noise reduction structure comprises a gear box, and the gear box comprises: A shell body, wherein the shell body is provided with a clearance opening; A cover body, wherein the cover body is sealed on the clearance opening, the cover body cooperates with the shell to form the noise reduction cavity, and the gear set is arranged in the noise reduction cavity; The inner wall surface of the body is convexly provided with a mounting pin, and the fan noise reduction structure includes a fixing part, which is connected to the periphery of the fan body. The fixing part is connected to the mounting pin so that the fan body is fixed in the body and a gap is formed between the outer surface of the fan body and the inner wall surface of the body.

2. The noise reduction assembly according to claim 1, characterized in that The fan noise reduction structure also includes a flexible kit, which is sleeved on the outer surface of the fan body.

3. The noise reduction assembly according to claim 1, wherein: The inner wall surface of the connection between the air inlet duct and the air outlet duct is arranged in a smooth transition.

4. The noise reduction assembly according to claim 3, characterized in that: The air duct noise reduction structure also includes sound-absorbing cotton, which is arranged on one side of the air outlet duct.

5. The noise reduction assembly according to claim 3, characterized in that: The air duct noise reduction structure also includes breathable sound-absorbing cotton, which is embedded and sealed in the air outlet of the air outlet duct.

6. The noise reduction assembly according to claim 1, wherein: The gear drive noise reduction structure further includes a lubricating member, and the lubricating member is used to lubricate the gear set; And / or, the shell is recessed on the surface of the periphery of the clearance opening to form a limiting groove, and the cover body is convexly provided with a protruding block on the surface circumferentially facing the limiting groove, and when the cover body is connected to the shell, the protruding block abuts and is limited in the limiting groove.

7. A sweeping robot, characterized in that: Comprising the noise reduction component as claimed in any one of claims 1 to 6.

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