Sound and noise reduction structure and sweeping robot
By arranging the air collecting structure and sound silence structure around the fan of smart furniture equipment, controlling the airflow direction and air output, the problem of unsatisfactory noise reduction in the existing technology is solved, and more effective noise reduction is achieved and user experience is improved.
Patent Information
- Application Number
- CN202420510525.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-16
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-03-16
AI Technical Summary
The prior art has poor results in noise reduction processing, and it is difficult to completely reduce noise in smart furniture equipment.
Design a sound reduction and noise reduction structure. By arranging the air collecting structure around the fan, the airflow is divided into two strands, and the combination of the wind direction adjustment baffle, the guided sound silencer and the airflow hole is used to control the airflow direction and airflow output, and the sound silencer is introduced. The structure is subject to noise reduction.
Accurate noise reduction processing of fan airflow is achieved, significantly reducing noise and improving user experience.
Smart Images
Figure CN222303844U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of household appliances, in particular to a sound reduction and noise reduction structure and a sweeping robot. Background Art
[0002] With the improvement of living standards and the acceleration of the pace of life, people's requirements for smart homes are also increasing.
[0003] In people's daily life, there are all kinds of smart furniture devices, which often contain drive machines or fans, etc. Such devices often generate a lot of noise in daily work, affecting people's use experience. In the prior art, some silencer structures are often set near the airflow flow path output by the fan to reduce the noise, but this effect is difficult to be thorough and the noise reduction effect is not ideal.
[0004] In this regard, the above-mentioned technical problems need to be solved. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, the utility model proposes a sound reduction and noise reduction structure. The technical solution arranges an air collecting structure around the fan, and the air collecting structure can divide the airflow blown out by the fan into at least two streams. By disassembling the airflow, each airflow is silenced and noise reduced one by one, so as to achieve the sound reduction and noise reduction of the technical solution.
[0006] In order to solve the above technical problems, the basic technical solution proposed by the utility model is:
[0007] A sound reduction and noise reduction structure comprises a shell, in which a fan and a silencer structure are arranged, and the periphery of the fan has a wind collecting structure; the wind collecting structure is used to control and adjust the air flow or air outlet direction blown out by the fan.
[0008] Further, the wind direction adjustment baffle has an end portion and a tail portion;
[0009] The extended lines of the tangents of the end and the tail of the wind direction adjustment baffle and the extended line of the diameter of the fan form an angle a;
[0010] The larger the angle a is, the greater the air volume of the air outlet is, and conversely, the smaller the air volume of the air outlet is.
[0011] Furthermore, the angle a does not include 45°, so as to avoid resonance between the wind direction adjustment baffle and the fan.
[0012] Furthermore, an air outlet is formed at the connection between the end and the tail of the wind direction adjustment baffle, and the air outlet is used for the air flow blown out by the fan to flow out.
[0013] Furthermore, the air outlet faces at least a portion of the sound-absorbing structure.
[0014] The noise reduction structure further comprises a plurality of guide noise reduction plates and a plurality of air outlet holes; the plurality of guide noise reduction plates and the plurality of air outlet holes are arranged in the shell at intervals.
[0015] The noise reduction structure further includes a noise reduction space enclosed together with the inner side wall of the shell.
[0016] Furthermore, the angle between the extension line of the inner surface of the guide silencer plate and the upper end side wall of the shell is b; the difference in angles b between adjacent guide silencer plates is 4°.
[0017] Furthermore, the aperture ratio of the adjacent air holes from left to right between the aperture of the first air hole and the aperture of the second air hole is 1.12.
[0018] A further sweeping robot comprises an air inlet, an air outlet, a fan, a dust filter and a sound reduction and noise reduction structure as described above, wherein the dust filter is placed between the air inlet and the fan.
[0019] The beneficial effect of the utility model is that a sound reduction and noise reduction structure of the technical solution has an air collecting structure around the fan, and the air collecting structure can control the direction and air volume of the airflow blown out by the fan, so that the airflow coming out of the air outlet can be accurately introduced into the direction of the silencer structure, thereby achieving the effect that the airflow can be fully processed by sound reduction and noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is an exploded schematic diagram of the sound reduction and noise reduction structure of this embodiment;
[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the sound reduction and noise reduction of this example;
[0022] Figure 3 This is a structural schematic diagram of the wind direction wind collection structure of this embodiment;
[0023] Figure 4 This is a diagram showing the angle arrangement of the wind direction adjustment baffle in this embodiment;
[0024] Figure 5 This is a schematic diagram of the arrangement of the guide silencer plate of this embodiment;
[0025] Figure 6 This is a schematic diagram of the arrangement structure of the second embodiment of the air outlet;
[0026] Figure 7 This is a cross-sectional view of the sound reduction and noise reduction structure of this embodiment;
[0027] Figure 8 This is the layout diagram of the second embodiment of the guide silencer plate;
[0028] Description of reference numerals:
[0029] 1-shell, 2-fan, 3-silencing structure, 4-air duct, 5-wind collecting structure, 6-air inlet, 7-dust filtering device, 11-upper cover, 12-lower cover, 13-detachable structure, 31-guide silencer plate, 31-air outlet, 33-silencing space, 34-silencing cotton, 41-opening, 42-sub-channel, 51-wind direction adjustment baffle, 52-storage space, 53-air outlet, 421-main channel, 422-secondary channel, 511-end, 512-tail, E-center line, D-parallel line, F-parallel line, W-extension line. DETAILED DESCRIPTION
[0030] The following will be combined with the attached Figure 1 To Attachment Figure 8 The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] It should be noted that if there are directions involved in the embodiments of the present invention, they shall be based on the directions shown in the drawings, such as front and rear. Figure 1 The specific Figure 1 The left side is the front, Figure 1 The right side is the back; at the same time Figure 2 As shown in the figure, the left-right direction is roughly the horizontal direction, and the up-down direction shown in the figure is the vertical direction. If a certain posture changes, the directional indication will also change accordingly.
[0032] A sound reduction and noise reduction structure of the technical solution, such as Figure 1 As shown, it includes a shell 1, and the shell 1 has an upper cover 11 and a lower cover 12. The upper cover 11 is covered on the lower cover 12, and the upper cover 11 and the lower cover 12 are connected by a detachable structure 13. The detachable structure 13 can be assembled by screws or the like. Further, a fan 2 and a silencer structure 3 are provided in the shell 1, and the silencer structure 3 includes a guide silencer plate 31 and an air outlet 32. The guide silencer plates 31 and the air outlet 32 are alternately spaced and distributed in the shell 1 in the form of an array. The guide silencer plates 31 and the air outlet 32 that form an array are combined with the inner side wall of the shell 1 to form a silencer space 33. The silencer space 33 is used to assemble silencer materials, so that the silencer structure 3 can reduce the sound generated by the fan 2 when it is working.
[0033] Further Figure 2 As shown, the housing also has an air duct 4 for air flow; the air duct 4 has openings 41 for air flow on both sides; the fan 2 is located in the air duct 4. In order to make the air flow around the fan 2 flow more smoothly in different directions, the outer periphery of the fan 2 further has an air collecting structure 5 that can concentrate and separate the air flow blown out by the fan 2 into at least two streams in different directions.
[0034] Specific as Figure 2 As shown, the wind collecting structure 5 is arranged around the fan 2 to accommodate the fan 2 therein, and the wind collecting structure 5 is connected to the inner top surface of the upper cover 11 and the inner bottom surface of the lower cover 12 to form a semi-enclosed pipe-like structure with an opening. The wind generated by the fan 2 when working can be guided and diverted by the wind collecting structure 5, and the airflow generated by the fan 2 can be blown into the direction of the muffler structure 3, so that the airflow is introduced into the muffler structure 3 more smoothly.
[0035] In some usage scenarios, a sound reduction and noise reduction structure of the present technical solution, when installed in furniture equipment such as the sweeping robot or air conditioner, is suitable for equipment with only one air duct 4.
[0036] Specifically, in the device, the wind collecting structure 5 is arranged around the fan 2 or the driving machine. The airflow generated by the fan 2 when working can be guided by the wind collecting structure 5 to the air duct 4, and then absorbed by the silencer structure 3 on the air duct 4 to perform sound reduction and noise reduction processing.
[0037] In some other scenarios, the air collecting structure 5 can also be used in a device having a plurality of the air ducts 4, and can also guide the airflow generated by the fan 2 into each of the air ducts 4 for sound reduction and noise reduction processing.
[0038] Further, such as Figure 2 As shown, the wind collecting structure 5 is a wind direction adjusting baffle 51; there are at least two wind direction adjusting baffles 51; the wind direction adjusting baffles 51 are arc-shaped, and the two wind direction adjusting baffles 51 enclose a semi-closed storage space 52, that is, it can be understood that the storage space 52 has two air outlets 53, and the fan 2 is accommodated in the storage space 52.
[0039] It should be noted that the fan 2 can be arranged in the middle of the two wind direction adjustment baffles 51, or can be arranged in a direction biased towards one side of the wind direction adjustment baffle 51. The wind direction adjustment baffle 51 on which side is closer to the fan 2 has a smaller air outlet 52, and the air volume is reduced accordingly. In actual applications, the distance between the fan 2 and the wind direction adjustment baffle 51 can be adjusted according to the specific usage scenario.
[0040] Further Figure 3 As shown, the wind direction adjusting baffle 51 has an end portion 511 and a tail portion 512 , and the air outlet 53 is formed at the connection between the end portion 511 and the tail portion 512 of the wind direction adjusting baffle 51 , and the air outlet 53 is used for the airflow blown out by the fan 2 to flow out.
[0041] It can be understood that when the fan 2 is working, the fan 2 emits airflow that rotates 360° around the fan 2. The path of the airflow first hits the inner wall of the wind direction adjusting baffle 51, flows along the curvature of the inner wall of the wind direction adjusting baffle 51 to the air outlet 53, and then flows into the air duct 4 after passing through the air outlet 53.
[0042] It should be noted that, in this embodiment, Figures 2 to 3 As shown, the wind direction adjusting baffle 51 decentralizes and diverts the airflow blown out of the fan 2 into at least two different directions. That is, the wind direction adjusting baffle 51 divides the airflow blown out of the fan 2 into two paths leading to different sub-channels 42 and then to the opening 41.
[0043] Further Figure 5 As shown, the tangent extension lines of the end 511 and the tail 512 of the wind direction adjustment baffle 51 form an angle a with the diameter extension line of the fan 2; the larger the angle a is, the greater the air volume of the air outlet 53 is, and vice versa, the smaller the air volume of the air outlet 53 is.
[0044] Furthermore, the angle a does not include 45°, so as to avoid resonance between the wind direction adjustment baffle 51 and the fan 2.
[0045] When the angle a is 45 degrees, the end 511 and the tail 512 of the wind direction adjustment baffle 51 are at the same distance from the fan 2. At this time, the wind blown out by the fan cannot be well guided out, which easily increases the friction of the airflow between the fan 2 and the wind direction adjustment baffle 51, thereby causing the vibration of the wind direction adjustment baffle 51 and the fan 2. However, when the angle a is an angle other than 45 degrees, the end 511 and the tail 512 of the wind direction adjustment baffle 51 are at different distances from the fan 2. At this time, the arrangement arc of the wind direction adjustment baffle 51 is consistent with the movement trajectory of the airflow, which is conducive to guiding the airflow out and does not increase the friction between the airflows.
[0046] Since the sub-channel 42 described above is divided into a main channel 421 and a secondary channel 422, it should be noted that the main channel 421 is longer than the secondary channel 422. Therefore, the side with a larger angle a is preferably on the same side as the main channel 421.
[0047] This design method is conducive to directing the airflow on the side with larger air output to the main channel 421. Since the main channel 421 is relatively long, it can accommodate more airflow and there is enough space for the airflow to flow slowly in the channel until it becomes smooth, thereby further reducing the whistling sound of the airflow.
[0048] It should be noted that in order to better guide the airflow blown out by the fan 2, Figure 6 As shown, more air outlets 53 may be provided on the wind direction adjusting baffle 51. The more air outlets 53 there are, the more conducive it is to guide the airflow out, so that the airflow can enter each channel more smoothly, reduce the whistling sound of the airflow, and thus reduce noise.
[0049] However, in order to achieve a better noise reduction effect, Figure 5 As shown, the further air outlet 53 faces at least a portion of the sound-absorbing structure 3 .
[0050] Specifically, the muffler structure 3 includes a plurality of guide muffler plates 31 and a plurality of air outlet holes 32; the plurality of guide muffler plates 31 and the plurality of air outlet holes 32 are arranged at intervals in the housing 1. The portion of the guide muffler plates 31 facing the air outlet 53 has a smaller windward area of the guide muffler plates 31, and the smaller the windward area of the guide muffler plates 31, the smaller the resistance to the airflow when the guide muffler plates 31 are impacted by the airflow blown out from the air outlet 53.
[0051] It should be understood that since air resistance is proportional to the square of speed, it is calculated according to the air resistance formula: F = (1 / 2) C*p*s*V^2, where: C is the air resistance coefficient; p is the air density; s is the windward area of the object; V is the relative speed between the object and the air. It can be seen from the above formula that under normal circumstances, the size of air resistance is proportional to the air resistance coefficient and the windward area, and is proportional to the square of speed.
[0052] It is understandable that, in the environment of the shell 1, when the air resistance, air density, and air flow velocity are constant, the larger the windward area of the object, the greater the air resistance, which will cause the air flow to generate great noise. Therefore, the guide muffler plate 31, as the windward object of the airflow, has a smaller contact area with the airflow, the better, which is more conducive to reducing the air resistance of the airflow.
[0053] Further, when the airflow flows out of the air outlet 53 along the curvature of the wind direction adjusting baffle 51, it flows in the direction of the guide muffler plate 31. It should be noted that the center point of the air outlet 53 and the connecting line of the corresponding guide muffler plate on the same straight line as the center point are defined as the center line E. Figure 5 shown.
[0054] The guide silencer plates 31 on the left side of the center line E are respectively parallel to the center line E. This design method is beneficial for the guide silencer plates 31 of this part to guide the airflow to the air outlet 32 after contacting the airflow, so that the airflow flows into the air outlet 32. It should be understood that this design method can divide and guide the airflow coming out of the air outlet 53 into the silencer space 33 in the form of minimum windward resistance, and be absorbed by the silencer material in the silencer space 33 enclosed by the silencer structure 3 and the inner wall of the shell 1.
[0055] Further Figure 5 As shown, a parallel line parallel to the upper side wall of the shell 1 is defined as D, and an angle between a center line E and a parallel line parallel to the upper side wall of the shell 1 is defined as b; since the angle difference between the adjacent guide silencer plates 31 is 4°, the guide silencer plates 31 in an array arrangement are distributed in a manner that tends to be parallel to the parallel line D from left to right.
[0056] Furthermore, when the angle b is between 30° and 45°, the guide silencer plate 31 can guide more than 80% of the airflow blown out by the fan 2.
[0057] It should be understood that when the angle b is between 30° and 45°, when the portion of the guide silencer 31 facing the air outlet 53 is arranged near the air outlet 53 in a manner nearly parallel to the center line E as mentioned above, the windward contact area of the guide silencer 31 in this portion with the airflow is the smallest, and therefore the wind resistance is minimized, which is beneficial for dividing the airflow and directing it into the air outlet 32.
[0058] On the right side of the dividing line E, i.e., area A, the arrangement of the guide silencer 31 in area A is beneficial when the airflow comes out of the fan 2. After part of the airflow is guided by the guide silencer 31 on the left side of the dividing line E, the other part of the airflow is guided by the guide silencer 31 arranged along the path of the air duct 4, i.e., the guide silencer 31 on the right side of the dividing line E. Since the airflow velocity of this section of the path is not as fast as the airflow velocity near the fan 2, the arrangement of the guide silencer 31 here in a manner nearly parallel to the upper side wall of the shell 1 is more conducive to assisting the smooth flow of the airflow, thereby avoiding noise.
[0059] Furthermore, the aperture ratio of the first air outlet hole 32 to the second air outlet hole 32 from left to right is 1.12.
[0060] It can be understood that the aperture of the air outlet 32 on the side of the main channel 42 in area A gradually increases from left to right. Figure 5 As shown, in area A, when the airflow flows to this side of the main channel 42 , the aperture of the air outlet 32 corresponding to the portion facing the air outlet 53 is smaller than the aperture of the air outlet 32 away from the air outlet 53 .
[0061] Since the velocity of the airflow blown out from the end of the fan 2 is relatively high at the beginning, arranging the air outlet 32 toward the air outlet 53 is conducive to guiding the airflow into the muffler structure 3. However, arranging the air outlet 32 away from the air outlet 53 with gradually increasing the aperture of the air outlet 32 is also conducive to guiding the airflow entering the rear side of the muffler structure 3 to flow out. As is well known, the relationship between the aperture size and wind resistance can be explained by the principles of fluid mechanics. When passing through the hole, collisions and frictions occur between gas molecules. The size of the hole determines the size of the channel through which the gas molecules pass. When the hole is large enough, gas molecules can pass more easily, reducing the friction that hinders the flow of gas, thereby reducing wind resistance. On the contrary, when the hole is small, gas molecules must pass through a narrow channel, resulting in more collisions and frictions, increasing resistance. The greater the resistance, the greater the noise.
[0062] Therefore, arranging the apertures of the air holes 32 in the main channel 42 to gradually increase in a ratio of 1.12 from left to right is beneficial to reducing the friction that hinders the airflow, thereby reducing the wind resistance of the airflow entering the silencer structure 3, and is beneficial to guiding the slower airflow in the main channel 421 into the air holes 32, thereby further reducing the generation of noise.
[0063] It should be understood that the larger the aperture of the air outlet holes 32 to the right on the side of the main channel 42, the more conducive it is to introduce the airflow here into the sound-reducing structure 3 for sound reduction and noise reduction processing. Because when the airflow blown out by the fan 2 blows here, the airflow speed here is not as fast as the airflow speed just out of the fan 2, the airflow speed here will be relatively slow, and gradually increasing the aperture of the air outlet holes 32 at this place will help to introduce the airflow here into the sound-reducing structure 3, thereby achieving sound reduction and noise reduction processing.
[0064] Further, such as Figure 5 As shown, in the auxiliary channel 422 on the left side of the fan 2, i.e., zone B, the connecting line between the center point of the air outlet 53 on this side and the guide silencer plate 31 in the same straight line is defined as W, and the parallel line parallel to the left side wall of the shell 1 is defined as F. The initial angle O of the angle between the connecting line W and the parallel line F is 35°. With the guide silencer plate 31 corresponding to the extended line W as the boundary, the angle O of the guide silencer plate 31 on the right side of zone B decreases by 4° per degree, so that each guide silencer plate 31 is arranged in a manner that gradually tends to be parallel to the D line. Similarly, this design method is also conducive to the wind coming out of the auxiliary channel 422 being introduced into the air outlet 32 in zone B for silencing and noise reduction processing.
[0065] In order to achieve a better effect of the sound reduction and noise reduction structure, further, a sound-absorbing material can be installed in the sound-absorbing space 33 enclosed by the sound-absorbing structure 3 and the side wall of the housing 1, that is, a sound-absorbing material such as sound-absorbing cotton can be installed in the sound-absorbing spaces 33 of the A area and the B area respectively. It can be understood that the sound-absorbing cotton is a porous material filled with air or other loose materials. This structure makes the sound waves reflected, superimposed and collided by the fiber material when passing through, thereby converting the energy of the sound waves into heat energy, resulting in a weakening of the sound wave intensity, and finally causing the noise to disappear.
[0066] In addition, the greater the density of the sound-absorbing cotton, the better its isolation effect, because the air molecules within the material are trapped in it, thereby reducing the reflection and propagation of sound waves, further achieving the purpose of reducing sound and noise.
[0067] In actual use scenarios of this technical solution, the upper cover 11 of the housing 1 needs to be placed on the lower cover 12, so that an area where the fan 2 works, an air duct 4 area where air flows, and a silencer area are formed inside the housing 1. It should be noted that at this time, the guide silencer plates 31 respectively provided in the upper and lower covers of the housing 1 are arranged in an aligned manner.
[0068] In addition, the air outlet 32 can also be Figure 1 and Figure 7 As shown, the air outlet 32 penetrates and connects the upper cover 11 and the lower cover 12 of the shell 1, and the height of the air outlet 32 is not lower than the height of the fan 2. Such a design is conducive to the wind blown out from different heights of the fan 2 being absorbed by the air outlet 32 into the sound-absorbing material for silent noise reduction processing.
[0069] Of course, in other usage scenarios, the air outlets 32 of the upper and lower covers may also be staggered, depending on the actual usage scenario.
[0070] In other usage scenarios, such as Figure 8 As shown, since the plurality of guide silencer plates 31 in the silencer structure 3 are arranged in an array, each row of guide silencer plates 31 is arranged in the housing 1 in a manner having a plurality of bends. It should be understood that when the airflow in the air duct 4 hits the guide silencer plates 31 at the bend, the airflow is blocked by the windward surface of the guide silencer plates 31, and under the action of mutual friction, the airflow reduces a part of the airflow velocity in the air duct 4; therefore, when the guide silencer plates 31 are arranged at the bends in the air duct 4, the airflow in the air duct 4 becomes smaller and smaller after passing through the friction blockage of the guide silencer plates 31, and the airflow velocity tends to zero. It can be understood that when the airflow velocity in the air duct 4 is zero, the friction between the airflow molecules in the air duct 4 does not exist. Since the noise is generated by the relative motion friction between the molecules, when the airflow molecules in the air duct 4 no longer move, the noise is reduced, thereby achieving the purpose of reducing sound and noise.
[0071] The sound reduction and noise reduction structure described above is generally in the form of a rectangular parallelepiped and can be installed in some household appliances such as sweeping robots, air conditioners, dust collectors, and mite removers.
[0072] When in the application scenario of a sweeping robot, a further sweeping robot includes an air inlet, an air outlet, a fan, a dust filter device and a sound reduction and noise reduction structure as described above, and the dust filter device is placed between the air inlet 6 and the fan 2.
[0073] It can be understood that arranging the dust filter device 7 (not shown in the figure) between the fan 2 and the air inlet 6 is beneficial to blocking the dust in the air there, so that the gas in the shell 1 reduces impurities and increases the service life of the machine. The dust in the dust filter device 7 can also be disassembled and cleaned for easy use.
[0074] In summary, a sound reduction and noise reduction structure of the present technical solution can be flexibly used with household appliances to achieve sound reduction and noise reduction when the household appliances are working, thereby improving user experience.
[0075] According to the disclosure and teaching of the above description, the technical personnel in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.
Claims
1. A sound reduction and noise reduction structure, comprising a housing, a fan and a noise reduction structure are arranged in the housing, characterized in that: The outer periphery of the fan has a wind collecting structure; An air collecting structure, used to control and adjust the air flow or air outlet direction blown out by the fan; The wind collecting structure comprises a wind direction adjusting baffle, wherein an air outlet is formed at the connection between the end and the tail of the wind direction adjusting baffle, and the air outlet is used for the air flow blown out by the fan to flow out; The air outlet faces at least a portion of the sound-absorbing structure.
2. The sound reduction and noise reduction structure according to claim 1, characterized in that: The wind direction adjustment baffle has an end portion and a tail portion; The extended lines of the tangents of the end and the tail of the wind direction adjustment baffle and the extended line of the diameter of the fan form an angle a; The larger the angle a is, the greater the air volume of the air outlet is, and conversely, the smaller the air volume of the air outlet is.
3. A sound reduction and noise reduction structure as claimed in claim 2, characterized in that: The angle a does not include 45°, so as to avoid resonance between the wind direction adjustment baffle and the fan.
4. The sound reduction and noise reduction structure according to claim 1, characterized in that: The noise reduction structure includes a plurality of guide noise reduction plates and a plurality of air outlets; A plurality of guide silencer plates and a plurality of air outlet holes are arranged in the shell at intervals.
5. The sound reduction and noise reduction structure according to claim 1, characterized in that: The noise reduction structure also includes a noise reduction space enclosed by the inner side wall of the shell.
6. The sound reduction and noise reduction structure according to claim 4, characterized in that: The angle between the extension line of the inner surface of the guide muffler plate and the upper end side wall of the shell is b; The difference in angles b between the adjacent guide silencer plates is 4°.
7. The sound reduction and noise reduction structure according to claim 4, characterized in that: The aperture ratio of the adjacent air holes from left to right between the aperture of the first air hole and the aperture of the second air hole is 1.
12.
8. A sweeping robot, characterized in that: It comprises an air inlet, an air outlet, a fan, a dust filter device and a sound reduction and noise reduction structure as described in any one of claims 1 to 7, wherein the dust filter device is placed between the air inlet and the fan.