Noise reduction device and sweeper

Abstract

The noise reduction device provided by the application is installed at the air outlet of a fan, and comprises a device body, a sound attenuation pipe, a driving assembly and a sliding plate. First and second partitions are arranged in the device body to divide the internal space of the device body into a sound wave reflection area, a resonance sound attenuation area and a noise adjustment area. The sound attenuation pipe is fixed on the first and second partitions, and the sliding plate is sleeved on the sound attenuation pipe. The sliding plate is in transmission connection with the driving assembly. The position of the sliding plate relative to the sound attenuation pipe is adjusted through the driving assembly, and then the number of sound attenuation holes of the sound attenuation pipe in the resonance sound attenuation area is adjusted, so that the noise reduction device has good sound attenuation effect on noises of different frequencies, and the problem that the existing sweeper produces noises of different frequencies when running at different gears and causes unsatisfactory sound attenuation quality is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of intelligent cleaning equipment, in particular to a noise reduction device and a sweeping machine. BACKGROUND

[0002] With the development of smart home devices, more and more smart home devices enter ordinary families to provide convenient services for users. The sweeping machine is favored by more and more users due to its automatic cleaning function, and becomes a commonly used household cleaning device.

[0003] As a household appliance, the intelligent sweeping machine generally has strict requirements for noise, so the sweeping machine is generally subjected to noise reduction treatment. However, the sweeping machine is a multi-gear operation mechanism, and the noise frequency generated by each gear is different. Therefore, there may be a case that the noise quality is good at one or two gears, but the noise quality is poor at other gears. SUMMARY

[0004] The noise reduction device and the sweeping machine provided by the present application aim to solve the problem that the sweeping machine in the prior art generates different frequencies of noise when running at different gears, resulting in unsatisfactory noise reduction quality.

[0005] In a first aspect, the present application provides a noise reduction device installed at an air outlet of a fan, comprising a device body, a noise reduction pipe, a driving assembly and a sliding plate. The device body is provided with an air inlet and an air outlet. The air inlet is in communication with the air outlet of the fan. A first partition plate and a second partition plate are arranged between the air inlet and the air outlet. The first partition plate and the second partition plate divide the internal space of the device body into a sound wave reflection zone, a resonance noise reduction zone and a noise adjustment zone along the inflow direction of the airflow. The first end of the noise reduction pipe extends out of the noise adjustment zone. The second end of the noise reduction pipe extends into the sound wave reflection zone and the resonance noise reduction zone through the first partition plate and the second partition plate. The noise reduction pipe is uniformly provided with noise reduction holes corresponding to the resonance noise reduction zone and the noise adjustment zone. The sliding plate is sleeved on the first end of the noise reduction pipe and is in transmission connection with the driving assembly. Under the action of the driving assembly, the sliding plate moves relative to the noise reduction pipe and the device body to adjust the number of noise reduction holes in the noise adjustment zone.

[0006] Preferably, the driving assembly comprises a driver installed on the device body. The output shaft of the driver is in transmission connection with the sliding plate. Under the driving action of the driver, the sliding plate can move relative to the noise reduction pipe and the device body.

[0007] Preferably, the driving assembly further comprises a gear shaft, the gear shaft is mounted on the device body through a bearing, the sliding plate is provided with a rack structure matched with the gear shaft, the output shaft of the driver is connected with the gear shaft, under the driving of the driver, the gear shaft can rotate relative to the device body, and then cooperates with the rack structure arranged on the sliding plate to drive the sliding plate to move relative to the muffling pipe and the device body.

[0008] Preferably, the sliding plate extends outwardly away from one side of the second partition plate to form a sleeve joint ring, the muffling pipe is arranged on the sliding plate through the sleeve joint ring, and the sleeve joint ring is used for covering the muffling hole.

[0009] Preferably, the sliding plate is provided with a sealing element, which is used for ensuring the sealing property of the contact between the sliding plate and the device body.

[0010] Preferably, the sealing element is made of graphite.

[0011] Preferably, the first partition plate is provided with a first opening, the second partition plate is provided with a second opening, and the outer diameter of the muffling pipe is the same as the diameter of the first opening and the diameter of the second opening.

[0012] Preferably, the cross-sectional area of the first partition plate is the same as the cross-sectional area of the second partition plate, and the cross-sectional area of the muffling pipe is different from the cross-sectional area of the first partition plate.

[0013] Preferably, the cross-sectional area of the air inlet is different from the cross-sectional area of the muffling pipe.

[0014] In a second aspect, the application further provides a sweeping machine, the sweeping machine is provided with the noise reduction device and the fan as described in any one of the above.

[0015] The noise reduction device of the application is installed at the air outlet of the fan, comprising a device body, a sound attenuation pipe, a driving assembly and a sliding plate, the device body is provided with an air inlet and an air outlet, the air inlet is communicated with the air outlet of the fan, a first partition plate and a second partition plate are arranged between the air inlet and the air outlet, the first partition plate and the second partition plate divide the internal space of the device body into a sound wave reflection zone, a resonance sound attenuation zone and a noise adjustment zone along the inflow direction of the airflow, the first end of the sound attenuation pipe extends out of the noise adjustment zone, the second end of the sound attenuation pipe extends into the sound wave reflection zone and the resonance sound attenuation zone through the first partition plate and the second partition plate, the sound attenuation pipe is provided with sound attenuation holes corresponding to the resonance sound attenuation zone and the noise adjustment zone, the sliding plate is sleeved on the first end of the sound attenuation pipe and is drivingly connected with the driving assembly, under the action of the driving assembly, the sliding plate moves relative to the sound attenuation pipe and the device body to adjust the number of sound attenuation holes in the noise adjustment zone, so that the noise reduction device has good sound attenuation effect on noise of different frequencies, and the problem of unsatisfactory sound attenuation quality caused by different frequencies of noise generated by the existing sweeper when running at different gears is solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The cross section of the noise reduction device in an embodiment Figure 1 ;

[0017] Figure 2 The cross section of the noise reduction device in an embodiment Figure 2 ;

[0018] Figure 3 The structure schematic view of the noise reduction device in an embodiment

[0019] Figure 4 The structure schematic view of the sweeper in an embodiment.

[0020] Wherein, 1, device body; 101, air inlet; 102, air outlet; 11, first partition plate; 12, second partition plate; 13, sound wave reflection zone; 14, resonance sound attenuation zone; 15, noise adjustment zone; 2, sound attenuation pipe; 3, driving assembly; 31, driver; 32, sliding plate; 33, gear shaft; 34, gear plate; 35, sleeve ring; 36, sealing element; 4, fan.

[0021] The implementation of the object of the application, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are merely intended to explain the application and are not intended to limit the application.

[0023] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0024] With reference to Figures 1 to 4 In a first aspect, the present application provides a noise reduction device installed at an air outlet of a fan 4, comprising a device body 1, a sound attenuation pipe 2, a driving assembly 3 and a sliding plate 32. The device body 1 is provided with an air inlet 101 and an air outlet 102. The air inlet 101 is in communication with the air outlet of the fan 4. A first partition plate 11 and a second partition plate 12 are arranged between the air inlet 101 and the air outlet 102. The first partition plate 11 and the second partition plate 12 divide the internal space of the device body 1 into a sound wave reflection area 13, a resonance sound attenuation area 14 and a noise adjustment area 15 along the inflow direction of the airflow. A first end of the sound attenuation pipe 2 extends out of the noise adjustment area 15. A second end of the sound attenuation pipe 2 extends into the sound wave reflection area 13 and the resonance sound attenuation area 14 through the first partition plate 11 and the second partition plate 12. The sound attenuation pipe 2 is uniformly provided with sound attenuation holes corresponding to the resonance sound attenuation area 14 and the noise adjustment area 15. The sliding plate 32 is sleeved on the first end of the sound attenuation pipe 2 and is in transmission connection with the driving assembly 3. Under the action of the driving assembly 3, the sliding plate 32 moves relative to the sound attenuation pipe 2 and the device body 1 to adjust the number of sound attenuation holes of the sound attenuation pipe 2 relative to the noise adjustment area 15.

[0025] As described above, the noise reduction device disclosed in the embodiment comprises a device body 1, a sound attenuation pipe 2 and a driving assembly 3, wherein the device body 1 is a hollow cavity with two open ends, one of the two open ends is defined as an air inlet 101 which is in communication with the air outlet of a fan 4, and the other end is an air outlet 102, it is worth mentioning that the air inlet 101 and the air outlet 102 can be oppositely arranged, that is, one opening can be formed on each of the two opposite surfaces of the device body 1 to serve as the air inlet 101 and the air outlet 102 of the device body 1 respectively; the air inlet 101 and the air outlet 102 can also be arranged on any two adjacent side walls of the device body 1, but no matter whether the air inlet 101 and the air outlet 102 are oppositely arranged or adjacently arranged, the first partition plate 11 and the second partition plate 12 need to be arranged between the air inlet 101 and the air outlet 102 to divide the internal space of the device body 1 into a sound wave reflection area 13, a resonance sound attenuation area 14 and a noise adjustment area 15, the driving assembly 3 is arranged on the side of the device body 1 away from the air inlet 101, that is, in the noise adjustment area 15, further, the driving assembly 3 can be arranged on the side of the side wall where the air outlet 102 is located facing the air inlet 101, preferably on the side of the side wall where the air outlet 102 is located away from the air inlet 101, that is, on the outside of the device body 1, the sound attenuation pipe 2 is installed in the device body 1, the sound attenuation pipe 2 is a regular hollow pipe body with openings at both ends, a plurality of sound attenuation holes are arranged on the pipe wall of the sound attenuation pipe 2, the sound attenuation holes are uniformly distributed on the part of the sound attenuation pipe 2 in the resonance sound attenuation area 14 and the noise adjustment area 15, a sliding plate 32 is sleeved on the sound attenuation pipe 2 and is located in the noise adjustment area 15, the peripheral side of the sliding plate 32 is in contact with the inner side wall of the noise adjustment area 15, the sliding plate 32 is in transmission connection with the driving assembly 3, under the driving action of the driving assembly 3, the sliding plate 32 can move relative to the sound attenuation pipe 2 and the device body 1, in the process that the sliding plate 32 moves relative to the sound attenuation pipe 2 to the first partition plate 11, that is, stretches into or withdraws from the direction close to the air inlet 101, the sliding plate 32 can cover the sound attenuation holes on the sound attenuation pipe 2, and at the same time can adjust the volume of the noise adjustment area 15 (becomes smaller), in the process that the sliding plate 32 moves relative to the sound attenuation pipe 2 away from the first partition plate 11, the volume of the noise adjustment area 15 (becomes larger), so that the number of sound attenuation holes exposed in the noise adjustment area 15 increases, at the same time, the sliding plate can cover the sound attenuation holes on the sound attenuation pipe 2, and at the same time can adjust the volume of the noise adjustment area 15 (becomes smaller), that is, stretches into or withdraws from the direction close to the air inlet, wherein the part of the sound attenuation pipe 2 exposed outside the second partition plate 12 forms the back cavity of the noise reduction device, the sound attenuation pipe 2 is driven relative to the first partition plate 11 and the second partition plate 12 by the driving assembly 3,Further, the length of the part of the sound muffling pipe 2 extending into the sound wave reflection area 13 and the length of the back cavity formed by the part of the sound muffling pipe 2 exposed outside the second partition plate 12 can be adjusted. When the fan 4 is in different gears during the operation of the sweeper, the speed of the fan 4 varies greatly when the gear of the fan 4 changes from a low gear to a high gear. The noise frequency curve generated by the fan 4 at different speeds is inconsistent. The higher the speed, the more obvious the high-frequency noise. When the noise generated by the fan 4 enters the noise reduction device, it first passes through the sound wave reflection area 13. The sound wave is reflected in the sound wave reflection area 13 after hitting the wall of the sound wave reflection area 13, thereby achieving a certain noise reduction effect. Then, the sound wave enters the resonance sound muffling area 14 through the sound muffling pipe 2. The sound muffling holes in the resonance sound muffling area 14 and the resonance sound muffling area 14 form a resonance system. When the sound wave flows through the resonance system, resonance occurs for noise of a specific frequency, thereby achieving the purpose of noise reduction. Therefore, the size and number of the sound muffling holes in the resonance sound muffling area 14 can determine the noise reduction effect of the resonance sound muffling area 14 on noise of different frequencies.

[0026] When the fan 4 is in a high gear, the driving assembly 3 drives the sliding plate 32 to move, so that the sliding plate 32 is located at the leftmost end of the noise reduction device (the leftmost end of the noise adjustment area 15, i.e., the outermost end). At this time, the resonance sound muffling area 14 is expanded from the original area space between the first partition plate 11 and the second partition plate 12 to the interval from the first partition plate 11 to the leftmost end of the noise adjustment area 15. At this time, the number of sound muffling holes in the resonance sound muffling area 14 of the sound muffling pipe 2 increases, i.e., the opening rate of the sound muffling pipe 2 in the resonance sound muffling area 14 increases, and the volume of the back cavity of the noise reduction device also increases, thereby achieving good noise reduction for high-frequency noise. Similarly, when the fan 4 changes from a high gear to a low gear, the driving assembly 3 drives the sliding plate 32 to move, so that the sliding plate 32 is located at the rightmost end. At this time, the number of sound muffling holes in the resonance sound muffling area 14 decreases, the opening rate decreases, and the volume of the back cavity of the noise reduction device also decreases, thereby achieving good noise reduction for low-frequency noise.

[0027] Referring to Figure 3 In one embodiment, the driving assembly 3 includes a driver 31 mounted on the device body 1. The output shaft of the driver 31 is in transmission connection with the sliding plate 32. Under the driving action of the driver 31, the sliding plate 32 can move relative to the sound muffling pipe 2 and the device body 1.

[0028] As described above, the driving assembly 3 in the embodiment comprises a driver 31 mounted on the device body 1 (the side wall of the noise adjusting area 15), wherein the driver 31 can be directly connected with the sliding plate 32 or indirectly connected through gears, belts, etc. The driver 31 can be an electric motor or a cylinder. When the driver 31 is a cylinder, the extension direction of the cylinder extension rod should be parallel to the moving direction of the sliding plate 32. The driver 31 drives the sliding plate 32 to move in a stroke range from the second partition plate 12 to the rightmost side (i.e. the innermost side) of the noise adjusting area 15. When the sliding plate 32 moves to the rightmost end and contacts the second partition plate 12, the rightmost end of the sound attenuation pipe 2 does not extend into the airflow inlet 101 or contact the side wall where the airflow inlet 101 is located. When the sliding plate 32 moves to the leftmost end, the rightmost end of the sound attenuation pipe 2 is still in the sound wave reflection area 13 instead of being retracted into the resonance sound attenuation area 14, and the sliding plate 32 does not separate from the device body 1.

[0029] In one embodiment, the driving assembly 3 further comprises a gear shaft 33 mounted on the device body 1 through a bearing. The sliding plate 32 is provided with a rack structure matched with the gear shaft 33. The output shaft of the driver 31 is connected with the gear shaft 33. Under the driving action of the driver 31, the gear shaft 33 can rotate relative to the device body 1, and then cooperate with the rack structure provided on the sliding plate 32 to drive the sliding plate 32 to move relative to the sound attenuation pipe 2 and the device body 1.

[0030] As described above, when the driver 31 is an electric motor, the driving assembly 3 further comprises a gear shaft 33 mounted on the device body 1 so that the gear shaft 33 can rotate relative to the device body 1. A rack structure matched with the gear shaft 33 is provided on the sliding plate 32. Specifically, a gear plate 34 provided with the rack structure can be arranged on the sliding plate 32. The rack structure of the gear plate 34 can intermesh with the gear shaft 33. The output shaft of the driver 31 can be directly connected with the gear shaft 33 or connected with the gear shaft 33 through a transmission gear. Then, the sliding plate 32 can be driven to move relative to the sound attenuation pipe 2 and the device body 1, thereby adjusting the number of sound attenuation holes in the noise adjusting area 15.

[0031] In one embodiment, the side of the sliding plate 32 away from the second partition plate 12 extends outward to form a sleeve joint ring 35. The sound attenuation pipe 2 is sleeved on the sliding plate 32 through the sleeve joint ring 35. The sleeve joint ring 35 is used to cover the sound attenuation holes.

[0032] As described above, the sliding plate 32 extends outwardly from the side away from the second partition plate 12 to form a sleeve ring 35, that is, the outer side wall of the sliding plate 32 extends outwardly to form a sleeve ring 35 with the same outer diameter as the noise reduction pipe 2, the noise reduction pipe 2 is sleeved in the sleeve ring 35, the sleeve ring 35 is a cylindrical structure with a certain length, and the two can slide relative to each other, so that when the sleeve ring 35 moves relative to the noise reduction pipe 2, the cylindrical structure can cover the noise reduction holes arranged on the noise reduction pipe 2, thereby adjusting the number of noise reduction holes in the noise adjustment area 15, and the length of the sleeve ring 35 should be long enough to ensure that the noise reduction pipe 2 always maintains in the same plane and does not tilt relative to each other.

[0033] In one embodiment, a sealing member 36 is arranged on the sliding plate 32 to ensure the airtightness of the contact between the sliding plate 32 and the device body 1.

[0034] In one embodiment, the sealing member 36 is made of graphite.

[0035] As described above, the contact surface between the sliding plate 32 and the device body 1 is provided with a sealing member 36 made of graphite, which has good wear resistance and a smooth surface, so that the resistance between the sliding plate 32 and the device body 1 during sliding is not too large, and the sealing property of the internal space of the device body 1 is ensured, so that the noise sound waves entering the device body 1 can be effectively transmitted out through the gap between the sliding plate 32 and the device body 1.

[0036] In one embodiment, the first partition plate 11 is provided with a first opening, the second partition plate 12 is provided with a second opening, and the outer diameter of the noise reduction pipe 2 is the same as the diameter of the first opening and the diameter of the first opening.

[0037] In one embodiment, the cross-sectional area of the first partition plate 11 is the same as the cross-sectional area of the second partition plate 12, and the cross-sectional area of the noise reduction pipe 2 is different from the cross-sectional area of the first partition plate 11.

[0038] In one embodiment, the cross-sectional area of the air inlet 101 is different from the cross-sectional area of the noise reduction pipe 2.

[0039] As described above, the cross-sectional area of the air outlet of the fan 4 and the cross-sectional area of the noise reduction pipe 2 are designed to be inconsistent, and the cross-sectional area of the first partition plate 11 and the cross-sectional area of the noise reduction pipe 2 are also designed to be inconsistent, so that when the sound waves are transmitted from the fan 4 into the sound wave reflection area 13, the sound waves will form a sound wave reflection 13 in the sound wave reflection area 13 after hitting the inner wall of the sound wave reflection area 13, thereby playing a certain noise reduction effect.

[0040] Referring to Figure 4 , in a second aspect, the application also provides a sweeping machine, which is provided with the noise reduction device and the fan 4 as described in any one of the above embodiments.

[0041] It should be noted that all directional indications, such as upper, lower, left, right, front, back, under, above, under, etc., are only used for the purpose of explanation and are not to be construed as indicating or implying relative importance or constituting a limitation of the described technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0042] In addition, the description in the present application such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0043] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A noise reduction device installed at an air outlet of a fan, characterized in that, The device comprises a device body, a muffling pipe, a driving assembly and a sliding plate. The device body is provided with an air inlet and an air outlet. The air inlet is communicated with an air outlet of the fan. A first partition plate and a second partition plate are arranged between the air inlet and the air outlet. The first partition plate and the second partition plate divide the internal space of the device body into a sound wave reflection zone, a resonance muffling zone and a noise adjusting zone along the inflow direction of the air flow. The first end of the muffling pipe extends out of the noise adjusting zone. The second end of the muffling pipe extends into the sound wave reflection zone and the resonance muffling zone through the first partition plate and the second partition plate. The muffling pipe is provided with muffling holes corresponding to the resonance muffling zone and the noise adjusting zone. The sliding plate is sleeved on the first end of the muffling pipe and is drivingly connected with the driving assembly. Under the action of the driving assembly, the sliding plate moves relative to the muffling pipe and the device body to adjust the number of muffling holes in the noise adjusting zone.

2. The noise reducing device of claim 1, wherein, The driving assembly comprises a driver. The driver is mounted on the device body. The output shaft of the driver is drivingly connected with the sliding plate. Under the driving action of the driver, the sliding plate can move relative to the muffling pipe and the device body.

3. The noise reducing device of claim 2, wherein, The driving assembly further comprises a gear shaft. The gear shaft is mounted on the device body through a bearing. The sliding plate is provided with a rack structure matched with the gear shaft. The output shaft of the driver is connected with the gear shaft. Under the driving action of the driver, the gear shaft can rotate relative to the device body. Then, the gear shaft cooperates with the rack structure arranged on the sliding plate to drive the sliding plate to move relative to the muffling pipe and the device body.

4. The noise reducing device of claim 2, wherein, The side of the sliding plate away from the second partition plate extends outward to form a sleeve joint ring. The muffling pipe is arranged on the sliding plate through the sleeve joint ring. The sleeve joint ring is used for covering the muffling holes.

5. The noise reducing device of claim 2, wherein, The sliding plate is provided with a sealing element for ensuring the airtightness of the contact between the sliding plate and the device body.

6. The noise reducing device of claim 5, wherein, The sealing element is made of graphite.

7. The noise reducing device of claim 1, wherein, The first partition plate is provided with a first opening. The second partition plate is provided with a second opening. The outer diameter of the muffling pipe is the same as the diameter of the first opening and the diameter of the second opening.

8. The noise reducing device of claim 1, wherein, The cross-sectional area of the first partition plate is the same as the cross-sectional area of the second partition plate. The cross-sectional area of the muffling pipe is different from the cross-sectional area of the first partition plate.

9. The noise reducing device of claim 1, wherein, The cross-sectional area of the air inlet is different from the cross-sectional area of the muffling pipe.

10. A robot vacuum cleaner characterised in that, The sweeping machine is provided with the noise reduction device and the fan as claimed in any one of claims 1 to 9.

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