Air duct noise reduction structure of window cleaning robot and window cleaning robot with air duct noise reduction structure

Abstract

The invention provides an air duct noise reduction structure of a window cleaning robot and the window cleaning robot with the air duct noise reduction structure, the air duct noise reduction structure comprises an upper shell and a chassis, the chassis is provided with an air inlet area, the air inlet area is correspondingly provided with a fan used for adsorbing a structural surface, the upper shell is provided with at least one group of air outlet channels, and the air outlet channels are communicated with the air inlet area. The fan is connected with a noise reduction device used for receiving high-speed airflow, and the noise reduction device communicates with at least one set of air outlet channels. The multi-stage noise reduction device is arranged between the fan and the upper shell, high-speed and high-pressure airflow generated by the fan is effectively treated, and therefore on the premise that the core adsorption performance is not sacrificed, generation and propagation of aerodynamic noise are remarkably restrained from the source.

Description

Technical field

[0001] Several attempts have been made to address this issue. However, the air duct design of most window-cleaning robots is driven solely by aerodynamic efficiency, employing simple straight-through or slightly curved structures that offer little noise suppression. Some solutions employ the use of sound-absorbing materials, but this not only has limited effectiveness in reducing critical mid- and low-frequency noise but can also lead to secondary problems such as increased wind resistance and material aging and shedding.

[0002] Therefore, how to effectively suppress aerodynamic noise through innovative design of the air duct structure itself while ensuring core adsorption performance and not significantly increasing the body size is a technical problem that needs to be solved urgently in this field. [Summary of the invention] The purpose of the present invention is to provide an air duct noise reduction structure for a window cleaning robot, aiming to solve the above-mentioned problem in the prior art that the window cleaning robot has huge working noise due to unreasonable air duct structure design, which seriously affects the user experience.

[0003] The present invention is achieved by the following technical solutions: A duct noise reduction structure for a window cleaning robot includes an upper shell and a chassis. The chassis is provided with an air inlet area, and a fan for adsorbing a structural surface is correspondingly provided in the air inlet area. The upper shell is provided with at least one group of air outlet channels, and the fan is connected to a noise reduction device for receiving high-speed airflow, and the noise reduction device is connected to at least one group of the air outlet channels.

[0004] As described above, the air duct noise reduction structure of the window cleaning robot, the noise reduction device includes a first silencer air chamber connected to the fan, a transition air port is provided on the first silencer air chamber, the transition air port is connected to a second silencer air chamber, and an air outlet is provided at one end of the second silencer air chamber connected to the air outlet duct.

[0005] In the air duct noise reduction structure of the window cleaning robot as described above, the opening edge of the first silencer air chamber is matched and connected with the fan, and gradually shrinks from its opening toward the transition air outlet.

[0006] As described above, the air duct noise reduction structure of the window cleaning robot is provided with a guide cap at the transition air outlet to guide the air flow into the second silencer air chamber.

[0007] The air duct noise reduction structure of the window cleaning robot described above, wherein the second silencing air chamber includes a first air cavity connected to the transition air outlet, the first air cavity is connected to a narrowing channel, and the narrowing channel is connected to a second air cavity connected to the air outlet channel; The cross-sectional area of the first air cavity along the airflow direction is configured to first increase and then decrease; The cross-sectional area of the second air cavity is larger than the cross-sectional area of the narrowed channel.

[0008] In the air duct noise reduction structure of the window cleaning robot as described above, at least one air guide plate for guiding the airflow into a tortuous path is provided in the second silencing air chamber.

[0009] In the air duct noise reduction structure of the window cleaning robot described above, the air guide plate includes a first curved plate extending from the inner wall of the second sound-absorbing air chamber, and a second curved plate corresponding to the inner wall of the second sound-absorbing air chamber near the rear end of the first curved plate extends outward; The air duct noise reduction structure of the window cleaning robot as described above, wherein the second air cavity is further provided with at least one air guide plate for guiding the airflow into a tortuous path; The wind deflector includes a first curved plate extending from the inner side wall of the narrowed channel, and a corresponding second curved plate extending from the inner wall of the second air cavity near the tail of the first curved plate; In the air duct noise reduction structure of the window cleaning robot as described above, the upper end surface of the second silencer air chamber is fitted with the upper shell.

[0010] A window cleaning robot comprises the air duct noise reduction structure described above.

[0011] Compared with the prior art, the present invention has the following advantages: The present invention effectively processes the high-speed and high-pressure airflow generated by the fan by arranging a multi-stage noise reduction device between the fan and the upper shell, thereby significantly suppressing the generation and propagation of aerodynamic noise from the source without sacrificing the core adsorption performance. The structural design of the present invention is sophisticated and can be highly integrated with the limited space inside the window cleaning robot. It can significantly reduce the working noise of the whole machine from more than 75 decibels commonly seen in the prior art to a comfortable range of about 60 decibels, thereby improving the user experience of the product. In addition, the noise reduction effect of the present invention is achieved without reducing the performance of the fan or sacrificing the safe adsorption force. By optimizing the airflow path and structural design to dissipate sound energy rather than reducing the wind speed, the technical contradiction of "high suction" and "low noise" that is difficult to strike a balance in the prior art is solved, thereby ensuring the safety and reliability of the window cleaning robot.

Brief Description of the Drawings

[0012] Figure 1 Schematic diagram of the three-dimensional structure of Example 1 of the present invention; Figure 2 The decomposition structure of Example 1 of the present invention is shown as follows Figure 1 ; Figure 3 The decomposition structure of Example 1 of the present invention is shown as follows Figure 2 ; Figure 4 Schematic diagram of the connection structure between the upper shell and the noise reduction device in Example 2; Figure 5 Schematic diagram of the connection structure between the fan and the noise reduction device of Example 2 of the present invention; Figure 6 Schematic diagram of the exploded structure of the fan and the noise reduction device of Example 2 of the present invention; Figure 7 Schematic diagram of an optional structure of the noise reduction device in Example 1 of the present invention Figure 1 ; Figure 8 Schematic diagram of an optional structure of the noise reduction device in Example 1 of the present invention Figure 2 ; Figure 9 A three-dimensional schematic diagram of an implementation structure of the noise reduction device in Example 2 of the present invention Figure 1 ; Figure 10 A three-dimensional schematic diagram of an implementation structure of the noise reduction device in Example 2 of the present invention Figure 2 ; Figure 11 The figure is a schematic diagram of the flow of airflow when the present invention is in operation. [Specific implementation method] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this application can be combined with each other. The descriptions in the following embodiments are intended to explain the present invention and should not be construed as limiting the present invention.

[0013] Please refer to the relevant attachments Figures 1 to 11 The present application provides an air duct noise reduction structure for a window cleaning robot, aiming to solve the technical problem in the prior art that the fan noise of the window cleaning robot is too loud when working, affecting the user experience.

[0014] Example 1: The window-cleaning robot's air duct noise reduction structure comprises an upper shell 1 and a chassis 2. Serving as the basic support structure of the entire robot, the upper shell 1 and chassis 2 can be made of high-strength, lightweight ABS engineering plastic or PC / ABS alloy. They are securely connected using conventional means such as snaps and screws, forming a cavity that houses the internal components. The chassis 2 is provided with an air inlet area 21, which is a circular grid-like or porous structure for drawing air from the outside. A fan 3 is positioned corresponding to the air inlet area 21, which is used to adhere to a structural surface, such as a glass window. This fan 3 can be a conventional centrifugal or axial flow fan, generating negative pressure that allows the entire window-cleaning robot to securely adhere to a vertical glass surface. Corresponding to the air inlet, the upper shell 1 is provided with at least one set of air outlet channels 11 for discharging airflow from within the robot. The core of the present invention is a noise reduction device 4, designed to receive and process high-speed airflow, connected downstream of the airflow path of the fan 3. The distal end of the noise reduction device 4 is connected to the air outlet channels 11. In order to prevent the vibration of the fan 3 from being transmitted to the noise reduction device 4 and the casing, causing resonance noise, a flexible sealing ring can be used to seal the connection between the fan 3 and the noise reduction device 4. The sealing ring can not only isolate the vibration, but also ensure airtightness, preventing air leakage from causing a decrease in suction.

[0015] Furthermore, as a preferred embodiment, in order to achieve an efficient noise reduction effect, the noise reduction device 4 is designed as a multi-stage noise reduction structure. Specifically, it includes a first noise reduction chamber 41 directly or indirectly connected to the air outlet of the fan 3. A transition air port 42 is provided on the first noise reduction chamber 41, and the transition air port 42 is connected to a second noise reduction chamber 43. Finally, an air outlet 44 is provided at one end of the second noise reduction chamber 43, and the air outlet 44 is connected to the air outlet channel 11. When the high-speed airflow generated by the fan 3 carries huge sound energy and suddenly enters the first noise reduction chamber 41 with a larger space, the airflow velocity drops sharply, the pressure changes stepwise, and the sound waves are reflected and interfered due to impedance mismatch, so that part of the sound energy, especially the sound energy in the medium and low frequency parts, is effectively attenuated. Subsequently, the airflow enters the second noise reduction chamber 43 for secondary processing to further enhance the overall noise reduction effect, and is finally discharged through the air outlet 44.

[0016] Furthermore, to optimize the effectiveness of the first-stage noise reduction, the structure of the first silencing plenum 41 can be specially designed. Specifically, its opening edge mates with the air outlet of the fan 3, and its cross-sectional area is configured to taper from its opening toward the transition plenum 42. This tapering structure, resembling a "funnel" or "bell mouth," effectively guides the airflow, preventing drastic boundary layer separation immediately after entering the first silencing plenum 41, thereby suppressing the generation of vortices, a significant source of secondary noise.

[0017] Furthermore, as an optional optimization solution, in order to ensure a smoother flow of air from the first muffler plenum 41 into the second muffler plenum 43, a guide cap 45 for guiding the airflow can be added to the transition plenum 42. The guide cap 45 can be an integrally injection-molded raised structure with a smooth curved surface such as a bullet head or a hemisphere. It can effectively prevent the airflow from making a sudden right-angle turn when entering the second muffler plenum 43, thereby reducing aerodynamic losses and the generation of secondary noise.

[0018] In this embodiment, the second muffler air chamber 43 can have two different but equally effective internal structural solutions: Option 1: See also Figure 7 As a specific implementation, the second muffler chamber 43 includes a first air cavity 431 connected to the transition air outlet 42. The first air cavity 431 is connected to a narrowing channel 432 with a smaller cross-sectional area. This narrowing channel 432 is in turn connected to a second air cavity 433 connected to the outlet channel 11. The cross-sectional area of the first air cavity 431 along the airflow direction is configured to first increase and then decrease, forming an expansion-contraction section. The cross-sectional area of the second air cavity 433 is larger than that of the narrowing channel 432, forming a re-expansion section. The cross-sectional area of the second air cavity 433 is significantly larger than that of the narrowing channel 432, forming a re-expansion section. When airflow passes through this complex "expansion-contraction-re-expansion" acoustic path, sound waves experience multiple dramatic impedance changes at the interfaces of different cross-sections, resulting in strong reflection and interference effects. This allows broadband acoustic energy to be efficiently converted into heat and dissipated, achieving excellent noise reduction.

[0019] Option 2: See also Figure 8 As another alternative implementation, the interior of the second silencing plenum 43 achieves noise reduction primarily by extending the airflow path. Specifically, at least one air deflector 46 is provided within the second silencing plenum 43 to guide the airflow into a zigzag path. This air deflector 46 can be integrally injection-molded from an engineering plastic such as ABS or PC. Its shape and number can be adjusted based on the desired noise reduction effect and space constraints.

[0020] As a specific implementation of this solution, the air deflector 46 can be cleverly formed by two curved plates. Specifically, it includes a first curved plate 461 extending from the inner sidewall of the second muffler chamber 43, and a second curved plate 462 extending from the inner sidewall near the rear of the first curved plate 461, corresponding to its streamline. These two curved plates together form an S-shaped, smooth flow channel, forcing the airflow path to be extended, thereby significantly extending the propagation distance of sound waves within a limited space and causing their energy to naturally decay during propagation.

[0021] Preferably, in order to improve the structural strength and stability of the first curved plate 461 and prevent it from vibrating or deforming due to high wind speed impact during long-term use, an integrally formed curved reinforcement rib 463 is provided at its root, that is, at the connection with the inner wall of the second silencer air chamber 43.

[0022] Furthermore, to ensure structural stability and space utilization, the upper end surface of the second silencing air chamber 43 can be aligned with the inner surface of the upper shell 1 to provide support. Furthermore, the air outlet duct 11 is preferably located on the side of the upper shell 1 to prevent the exhaust airflow from blowing upward or downward, thereby interfering with the cleaning operation or adsorption stability of the window cleaning robot.

[0023] Example 2: This embodiment provides a more effective air duct noise reduction structure based on Example 1. Most of the structures of this embodiment and Example 1, such as the upper shell 1, chassis 2, fan 3, and first muffler chamber 41, are the same. The core difference lies in the composite design of the internal structure of the second muffler chamber 43, aiming to achieve a superimposed and synergistic noise reduction effect.

[0024] Please refer to the relevant attachments Figure 5 、 Figure 6 、 Figure 9 ,and Figure 10 The internal structure of the second silencing air chamber 43 first includes a first air cavity 431, a narrowing channel 432, and a second air cavity 433. Furthermore, to further "suppress" residual noise, at least one air guide plate 46 is added inside the second air cavity 433 to guide the airflow into a zigzag path.

[0025] The ingenuity of this structure lies in its integration of two distinct noise reduction mechanisms—"resistive noise reduction" targeting mid- and low-frequency sounds, and "resistive noise reduction" targeting mid- and high-frequency sounds—into a single component, achieving the remarkable effect of "synergistic noise reduction across frequency bands and regions." After the initial noise reduction process of the first air cavity 431 and the narrowing channel 432, the airflow's turbulence intensity is reduced, and its sound energy is attenuated. Upon entering the second air cavity 433, the airflow is forced to flow smoothly around it by the air guide 46, effectively absorbing and dissipating any residual mid- and high-frequency noise energy it carries.

[0026] As a specific implementation of this composite structure, the wind guide plate 46 can also include a first curved plate 461 extending from the inner wall of the narrowed channel 432, and a corresponding second curved plate 462 extending from the inner wall of the second air cavity 433 near the tail of the first curved plate 461.

[0027] Similarly, for structural reliability, an arc-shaped reinforcing rib 463 may also be provided at the root of the first arc-shaped plate 461 .

[0028] Example 3: This embodiment provides a window cleaning robot, which is integrated with an air duct noise reduction structure described in Example 1 or Example 2.

[0029] Specifically, the window cleaning robot of this embodiment includes the necessary components conventional in the art for achieving autonomous operation, such as a control system module for processing algorithms and sensor data, a cleaning execution module for performing cleaning actions such as wiping or spraying water, and a power supply module for powering the entire machine. Its innovation lies in the integration of the air duct noise reduction structure described in the aforementioned embodiment 1 or 2. Due to the integration of the air duct noise reduction structure described in embodiment 1 or 2, the high-speed airflow generated by the fan 3 is greatly attenuated before it is discharged from the body. Therefore, the window cleaning robot of this embodiment can significantly reduce the operating noise of the entire machine compared to the window cleaning robots of the prior art, while ensuring that the fan 3 provides sufficient suction force to achieve safe operation. This greatly improves the comfort and user experience of the product, allowing users to enjoy the convenience brought by automated cleaning in a quieter environment, and has very significant market competitive advantages and practical value.

[0030] Those skilled in the art will appreciate that the above embodiments are preferred embodiments of the present invention and are intended to illustrate the present invention in more detail. However, the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wind duct noise reduction structure for a window cleaning robot, comprising an upper shell (1) and a chassis (2), characterized in that: The chassis (2) is provided with an air inlet area (21), and the air inlet area (21) is correspondingly provided with a fan (3) for adsorbing the structural surface. The upper shell (1) is provided with at least one set of air outlet channels (11), and the fan (3) is connected to a noise reduction device (4) for receiving high-speed airflow, and the noise reduction device (4) is connected to at least one set of the air outlet channels (11).

2. The air duct noise reduction structure of the window cleaning robot according to claim 1, characterized in that: The noise reduction device (4) comprises a first silencer air chamber (41) connected to the fan (3), a transition air port (42) being provided on the first silencer air chamber (41), the transition air port (42) being connected to a second silencer air chamber (43), and an air outlet (44) being provided at one end of the second silencer air chamber (43) and connected to the air outlet channel (11).

3. The air duct noise reduction structure of the window cleaning robot according to claim 2, characterized in that: The opening edge of the first muffler air chamber (41) is matched and connected to the fan (3), and gradually shrinks from its opening toward the transition air outlet (42).

4. The air duct noise reduction structure of the window cleaning robot according to claim 2, characterized in that: A guide cap (45) is provided at the transition air port (42) for guiding the air flow into the second muffler air chamber (43).

5. The air duct noise reduction structure of the window cleaning robot according to any one of claims 2 to 4, characterized in that: The second muffler air chamber (43) comprises a first air cavity (431) connected to the transition air port (42), the first air cavity (431) being connected to a narrowing channel (432), and the narrowing channel (432) being connected to a second air cavity (433) connected to the air outlet channel (11); The cross-sectional area of the first air cavity (431) along the airflow direction is configured to first increase and then decrease; The cross-sectional area of the second air cavity (433) is greater than the cross-sectional area of the narrowing channel (432).

6. The air duct noise reduction structure of the window cleaning robot according to any one of claims 2 to 4, characterized in that: At least one air guide plate (46) for guiding the airflow into a zigzag path is provided in the second muffler air chamber (43).

7. The air duct noise reduction structure of the window cleaning robot according to claim 6, characterized in that: The air guide plate (46) comprises a first curved plate (461) extending from the inner side wall of the second silencer air chamber (43), and a corresponding second curved plate (462) extending from the inner side wall of the second silencer air chamber (43) near the tail of the first curved plate (461).

8. The air duct noise reduction structure of the window cleaning robot according to claim 5, characterized in that: At least one wind guide plate (46) for guiding the airflow into a zigzag path is further provided in the second air cavity (433); The air guide plate (46) comprises a first curved plate (461) extending from the inner wall of the narrowing channel (432), and a corresponding second curved plate (462) extending from the inner wall of the second air cavity (433) near the tail of the first curved plate (461).

9. The air duct noise reduction structure of the window cleaning robot according to claim 2, characterized in that: The upper end surface of the second muffler air chamber (43) is in contact with the upper shell (1).

10. A window cleaning robot, characterized in that: It comprises the air duct noise reduction structure according to any one of claims 1 to 9.

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