A window cleaning robot silent air duct device

Abstract

The application belongs to the technical field of cleaning robots, and particularly relates to a window-cleaning robot mute air duct device. The device comprises a lower machine body shell provided with an air inlet at the bottom, an upper machine body shell connected with the lower machine body shell and provided with an air outlet, an air duct component connected with the upper machine body shell, and a fan assembly connected with the air duct component and located between the air inlet and the air duct component. The air duct component is connected with the upper machine body shell to form an air cavity and an air outlet channel communicating the air cavity and the air outlet. A plurality of sound-absorbing holes corresponding to the air cavity are arranged on the air duct component. The plurality of sound-absorbing holes arranged on the air duct component can effectively absorb and dissipate the sound waves propagating in the air cavity, so that the noise can be significantly weakened before the air flow is discharged from the air outlet. The design is simple in structure and high in integration, and can reduce the working noise of the whole machine without adding additional complex components, thereby providing a more quiet and comfortable use experience for users.

Description

[Technical Field] This application belongs to the field of cleaning robot technology, specifically relating to a silent air duct device for a window cleaning robot. [Background Technology] Window cleaning robots use built-in fans to generate negative pressure, allowing them to adhere to vertical glass surfaces for movement and cleaning. This solves the problem of cleaning exterior windows and high-mounted interior windows in high-rise buildings. However, existing window cleaning robots on the market generate significant noise from their fan systems, typically reaching around 70 decibels. This high level of noise can severely impact the user experience, especially in quiet home or office environments where prolonged operation can become a bothersome noise source. [Utility Model Content] To address the issue of high noise levels generated during operation by existing window cleaning robots, this application provides a silent air duct device for window cleaning robots.

[0004] This application is achieved through the following technical solution: A silent air duct device for a window cleaning robot includes a lower body shell with an air inlet at the bottom, an upper body shell connected to the lower body shell and having an air outlet, an air duct component connected to the upper body shell, and a fan assembly connected to the air duct component and located between the air inlet and the air duct component. The air duct component is connected to the upper body shell to form an air cavity and an air outlet channel connecting the air cavity and the air outlet. The air duct component has a plurality of silencers corresponding to the air cavity.

[0005] As described above, a silent air duct device for a window cleaning robot has a first opening at the center of the air inlet on the air duct component, and the sound-absorbing holes are distributed in a ring array around the first opening.

[0006] As described above, a silent air duct device for a window cleaning robot includes a sound-absorbing medium inside the air cavity, and a second opening in the middle of the sound-absorbing medium corresponding to the air inlet.

[0007] As described above, a silent air duct device for a window cleaning robot includes multiple symmetrically arranged sound-absorbing fins in the air outlet duct. Two of the symmetrically arranged sound-absorbing fins gradually narrow the air outlet duct along the air outlet direction.

[0008] The silent air duct device for a window cleaning robot as described above also includes a rubber sleeve fitted on the outside of the fan assembly.

[0009] As described above, in a silent air duct device for a window cleaning robot, the outer side wall of the fan assembly is provided with multiple snap-fit ​​protrusions, and the inner side wall of the rubber sleeve is provided with multiple snap-fit ​​interfaces for the snap-fit ​​protrusions to snap into. The snap-fit ​​protrusions snap into the snap-fit ​​interfaces to connect the fan assembly and the rubber sleeve.

[0010] As described above, a silent air duct device for a window cleaning robot has a limiting groove on the lower shell of the body for inserting the bottom of the rubber sleeve, and the rubber sleeve is located between the fan assembly and the lower shell of the body.

[0011] As described above, a silent air duct device for a window cleaning robot has a flange at the bottom of the limiting groove arranged in its circumferential direction, and a groove at the bottom of the rubber sleeve; or the bottom of the rubber sleeve has a flange arranged in its circumferential direction, and the bottom of the limiting groove has a groove, wherein the flange is inserted into the groove to seal the lower shell of the machine body and the rubber sleeve.

[0012] As described above, a silent air duct device for a window cleaning robot has an arc-shaped slope extending upward to the air outlet at the end of the air outlet component corresponding to the end of the air outlet channel.

[0013] As described above, in a silent air duct device for a window cleaning robot, a connecting hole is provided on the rubber sleeve, and a connecting hole post corresponding to the connecting hole is provided on the lower shell of the machine body. Fasteners pass through the connecting hole and the connecting hole post to connect the rubber sleeve and the lower shell of the machine body.

[0014] Compared with the prior art, this application has the following advantages: This application discloses a silent air duct device for a window cleaning robot. By adding an air duct component and integrating it with the robot's outer shell to form an independent air cavity and air outlet channel, multiple sound-absorbing holes on the air duct component effectively absorb and dissipate the sound waves propagating within the air cavity when the high-speed airflow generated by the fan carries noise into the air cavity. This significantly reduces noise before the airflow exits the outlet. This design is simple in structure and highly integrated, reducing the overall operating noise of the machine without adding additional complex components, providing users with a quieter and more comfortable user experience. [Attached Image Description] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an exploded view of an embodiment of this application; Figure 2This is a partial exploded view of an embodiment of this application; Figure 3 This is a top view of an embodiment of this application; Figure 4 yes Figure 3 Cross-sectional view at point AA; Figure 5 yes Figure 4 Enlarged view at point A in the middle; Figure 6 This is a three-dimensional perspective view of the air duct component in the embodiment of this application; Figure 7 This is a three-dimensional perspective view of the rubber sleeve in the embodiments of this application.

Detailed Implementation Methods

[0018] Please see Figures 1 to 7 A silent air duct device for a window cleaning robot includes a lower body shell 2 with an air inlet 1 at the bottom, an upper body shell 4 connected to the lower body shell 2 and having an air outlet 3, an air duct component 5 connected to the upper body shell 4, and a fan assembly 6 connected to the air duct component 5 and located between the air inlet 1 and the air duct component 5. The air duct component 5 is connected to the upper body shell 4 to form an air cavity 51 and an air outlet channel 52 connecting the air cavity 51 and the air outlet 3. The air duct component 5 is provided with a plurality of silencers 53 corresponding to the air cavity 51.

[0019] This application discloses a silent air duct device for a window cleaning robot. By adding an air duct component and integrating it with the robot's outer shell to form an independent air cavity and air outlet channel, multiple sound-absorbing holes on the air duct component effectively absorb and dissipate the sound waves propagating within the air cavity when the high-speed airflow generated by the fan carries noise into the air cavity. This significantly reduces noise before the airflow exits the outlet. This design is simple in structure and highly integrated, reducing the overall operating noise of the machine without adding additional complex components, providing users with a quieter and more comfortable user experience.

[0020] Furthermore, as a preferred embodiment of this solution and not a limitation, the air duct component 5 is provided with a first opening 54 corresponding to the middle of the air inlet 1, and the silencing holes 53 are distributed in a ring array around the first opening 54.

[0021] In this embodiment, by placing the first opening 54 in the center of the air duct component 5 to directly receive the core airflow from the fan assembly, and distributing the silencing holes 53 in a ring array around it, an optimized structure for source noise reduction is constructed. Its working principle is that when the high-speed, high-noise concentrated airflow generated by the fan enters the air cavity through the first opening 54, its accompanying sound energy immediately diffuses in all directions. The ring array of silencing holes 53 absorbs and dissipates the noise in this area at the first moment and with maximum efficiency, thus significantly weakening the noise before it diffuses into the entire air cavity, achieving a more targeted noise reduction effect. The ring array of silencing holes 53 can be configured as a combination of holes of varying sizes or depths. Since holes of different sizes have different resonance absorption effects on sound waves of different frequencies, this design can effectively broaden the effective frequency range of noise reduction, solving the technical problem that the noise spectrum of the fan changes at different speeds, leading to unstable noise reduction effects. This allows the machine to maintain good quiet performance in various operating modes.

[0022] Furthermore, as a preferred embodiment of this solution and not a limitation, the air cavity 51 is provided with a sound-absorbing medium 55, and the middle part of the sound-absorbing medium 55 is provided with a second opening 551 corresponding to the air inlet 1.

[0023] In this embodiment, a highly efficient sound energy absorption structure is achieved by directly placing a sound-absorbing medium 55 (made of sound-absorbing cotton) inside the air cavity 51 and creating a second opening 551 specifically for the passage of the core airflow. The working principle is that the main airflow necessary to maintain the device's adsorption function can pass unimpeded through the second opening 551, ensuring that the fan's working efficiency is not affected, and the sound-absorbing cotton does not obstruct the airflow, thus not affecting the normal operation of the machine. Noise generated by the fan and radiating outwards is immediately intercepted and absorbed by the sound-absorbing medium 55 upon entering the air cavity. The porous structure inside the medium forces sound waves to repeatedly refract and rub against each other, achieving noise attenuation at its source. The beneficial effects of this design are direct and significant noise reduction, especially its strong absorption capacity for mid-to-high frequency noise. An annular flow guide ring can also be added to the inner wall of the second opening 551. This flow guide ring can serve as a skeleton to prevent the sound-absorbing medium from being drawn in by the high-speed airflow and deformed or damaged, thus solving the durability problem of the flexible medium. The sound-absorbing medium 55 can adopt a composite structure, for example, it can be composed of a high-density resistive layer near the fan and a low-density porous sound-absorbing layer away from the fan. This design can utilize the differences in the absorption characteristics of different materials for different frequency bands of sound to achieve more effective suppression of broadband noise, thus solving the technical problem of uneven absorption of complex noise spectrum by a single material.

[0024] Furthermore, as a preferred embodiment of this solution and not a limitation, the air outlet channel 52 is provided with a plurality of sound-absorbing fins 56 arranged symmetrically to each other, and the two sound-absorbing fins 56 arranged symmetrically to each other gradually narrow the air outlet channel 52 along the air outlet direction.

[0025] In this embodiment, by setting symmetrical and gradually narrowing sound-absorbing fins 56 in the air outlet channel 52, noise reduction effect is achieved on the final exhaust airflow. The working principle is as follows: First, these fins act as physical barriers, increasing the path for sound wave reflection and diffraction within the channel, effectively attenuating residual noise transmitted to the outlet with the airflow. Second, their symmetrically narrowing structure forms a rectifying channel, which can sort and constrain any turbulent airflow that may still exist in the air cavity, allowing it to be discharged in a smoother, laminar flow state. This significantly reduces the jet noise generated by the intense friction between the airflow and the outlet edge. Although this structural setting reduces the airflow discharge rate, it does not affect the normal operation of the machine. This design makes the entire machine operate more quietly. Alternatively, the surface of the sound-absorbing fins 56 can be designed as a rough frosted surface or a microporous structure. This improvement utilizes the increased surface area to further dissipate sound energy and disrupt the regular reflection of sound waves, solving the problem that smooth surfaces easily lead to sound focusing or reflection, and improving the passive noise reduction effect. Another optimized embodiment involves designing the silencer fins 56 with an aerodynamic curved profile, such as an arc resembling an airfoil, and shaping the narrowed channel section into the form of a Laval nozzle. This design not only guides airflow more smoothly and minimizes turbulence, but also recovers airflow energy to some extent and reduces wind resistance. It solves the energy loss and local pressure fluctuation problems that may result from simple straight-line narrowing, thereby improving the overall energy efficiency of the fan system while achieving quiet operation. Furthermore, multiple pairs of silencer fins can be arranged in series along the air outlet direction to form a multi-stage noise reduction structure to meet higher noise suppression requirements.

[0026] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, it also includes a rubber sleeve 7 fitted onto the outside of the fan assembly 6.

[0027] In this embodiment, a rubber sleeve 7 is wrapped around the outside of the fan assembly 6 to suppress noise at the source from both vibration and sound wave transmission dimensions. Its working principle is as follows: Firstly, the rubber sleeve 7 utilizes its own elastic damping characteristics as a vibration buffer medium, effectively absorbing the mechanical vibration generated by the fan motor during high-speed operation and isolating the fan assembly 6 from rigid collisions with the casing and other parts, thereby avoiding secondary noise generated by structural resonance and collisions. Secondly, the mass and density of the rubber sleeve 7 itself make it a sound barrier, directly blocking and absorbing some of the airborne noise radiated from the fan surface, reducing the external transmission of noise. The beneficial effect of this design is that it simultaneously solves both structural vibration noise and airborne noise, making the entire machine operate more smoothly and quietly. The rubber sleeve 7 can be injection molded from composite materials. For example, a softer rubber with lower hardness can be used inside near the motor to maximize vibration absorption, while a harder rubber with higher density can be used on the outside to enhance sound insulation. This multi-material layered structure can specifically address different types of noise, solving the technical problem that a single material cannot simultaneously optimize both vibration reduction and sound insulation. In addition, considering that the fan will generate heat during operation, the material of the sleeve 7 can be changed to thermally conductive silicone, and heat dissipation fins can be designed on its outer surface. This will not only reduce vibration and noise, but also help the fan dissipate heat, thus solving the problem of motor overheating that may be caused by the covering.

[0028] Furthermore, as a preferred embodiment of this solution and not a limitation, the outer side wall of the fan assembly 6 is provided with a plurality of snap-fit ​​protrusions 61, and the inner side wall of the rubber sleeve 7 is provided with a plurality of snap-fit ​​interfaces 71 for the snap-fit ​​protrusions 61 to snap into. The snap-fit ​​protrusions 61 snap into the snap-fit ​​interfaces 71 to connect the fan assembly 6 and the rubber sleeve 7.

[0029] In this embodiment, a tool-free, quickly assembled precision fixing structure is achieved through the circumferential array of snap-fit ​​protrusions 61 and snap-fit ​​interfaces 71. Its working principle utilizes the elasticity of the sleeve 7; when the fan assembly 6 is pressed in, the snap-fit ​​interface 71 instantly expands to accommodate the snap-fit ​​protrusions 61, and then quickly rebounds after the protrusions pass a specific position, forming a robust mechanical interlock. This improves assembly efficiency on the production line, reduces manufacturing costs, and, more importantly, ensures that the multiple circumferentially distributed snap-fit ​​points automatically center and circumferentially position the fan assembly 6 within the sleeve 7, avoiding abnormal vibrations caused by installation eccentricity or angular deviations, and guaranteeing the consistency and reliability of the vibration damping system.

[0030] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the lower housing 2 of the fuselage is provided with a limiting groove 21 for the bottom of the rubber sleeve 7 to be inserted, and the rubber sleeve 7 is located between the fan assembly 6 and the lower housing 2 of the fuselage.

[0031] In this embodiment, a limiting groove 21 is provided on the lower shell 2 of the fuselage to provide a precise, non-rigid bearing base for the rubber sleeve 7 that encloses the fan assembly 6. The working principle is to use the physical boundary of the limiting groove 21 to stably limit the radial and axial movement of the rubber sleeve 7 and the internal fan assembly, ensuring the precise position and attitude of the fan within the entire unit. Simultaneously, the entire supporting force is transmitted through the flexible rubber sleeve 7, avoiding rigid contact between the fan assembly and the enlarged fuselage shell. The beneficial effect of this design is the construction of a complete vibration isolation link, providing stable support for the core power components while maximizing the prevention of structural vibration noise transmission, achieving a perfect unity of support function and vibration reduction / noise reduction function. Alternatively, the mating surfaces of the limiting groove 21 and the rubber sleeve 7 can be designed as conical or spherical, using arc-shaped contact instead of planar contact. This method allows the fan assembly to make slight angular deflections and self-correction when subjected to external impacts, acting as a buffer similar to a universal joint. This solves the problem of hard transmission of impact force that may occur due to rigid limiting during equipment movement or collisions, improving the overall impact resistance and durability of the machine. In addition, a layer of independent shock-absorbing rubber pad with lower hardness and stronger damping characteristics can be pre-placed in the limiting groove 21, and the rubber sleeve 7 can be placed on top of it to form a double-layer shock-absorbing structure. This composite design can absorb vibrations of different frequencies in stages, thereby achieving a wider bandwidth and more efficient vibration suppression effect.

[0032] Furthermore, as a preferred embodiment of this solution and not a limitation, the bottom of the limiting groove 21 is provided with a flange 211 arranged in its circumferential direction, and the bottom of the rubber sleeve 7 is provided with a groove 72; or the bottom of the rubber sleeve 7 is provided with a flange 211 arranged in its circumferential direction, and the bottom of the limiting groove 21 is provided with a groove 72, wherein the flange 211 is inserted into the groove 72 to seal the lower shell 2 of the body and the rubber sleeve 7.

[0033] In this embodiment, a sealing structure is constructed by setting an interlocking flange 211 and groove 72 between the limiting groove 21 of the lower housing 2 and the bottom of the rubber sleeve 7. The core working principle is that when the rubber sleeve 7 is pressed into the limiting groove 21, the flange and groove will fit tightly together and deform due to the elasticity of the rubber sleeve. This not only forms a physical mechanical interlock, enhancing axial connection stability, but more importantly, it greatly extends and complicates the air leakage path at the joint surface. The beneficial effect of this design is a significant improvement in the airtightness of the fan assembly installation area, effectively preventing high-pressure gas in the air cavity from leaking to the outside of the equipment or low-pressure areas through this joint, thereby ensuring the working efficiency of the fan and the overall adsorption force of the machine, and solving the performance degradation problem caused by installation gaps.

[0034] Furthermore, as a preferred embodiment of this solution and not a limitation, the air duct component 5 is provided with an arc-shaped slope 57 extending upward to the air outlet 3 at the end of the air outlet channel 52.

[0035] In this embodiment, an arc-shaped slope 57 that smoothly transitions upwards to the air outlet 3 is provided at the end of the air outlet duct 52. Its core working principle is to use fluid dynamics principles to ultimately guide and optimize the exhaust airflow, thereby reducing noise. Without this structure, when the airflow reaches the end of the duct, it would violently collide with the right-angled or acute-angled edge of the air outlet, generating turbulence and eddies, resulting in high-frequency aerodynamic noise. The arc-shaped slope 57 provides a smooth path, guiding the airflow to smoothly turn and exit in a laminar or near-laminar state along a gentle radius of curvature, effectively avoiding airflow separation and turbulence. The beneficial effects of this design are not only a significant reduction in aerodynamic noise at the air outlet, making the equipment operate more quietly, but also a reduction in energy loss and local pressure drop caused by turbulence, improving the aerodynamic efficiency of the entire duct system and helping to enhance suction or reduce power consumption. As one possible implementation, the single arc-shaped slope 57 can be extended to the entire inner wall of the air outlet 3, forming a complete, funnel-shaped channel outlet. This minimizes outlet resistance and allows the airflow to enter the surrounding environment in the smoothest possible state, thereby minimizing aerodynamic noise. Furthermore, several small, similarly arc-shaped guide ribs can be arranged on the arc-shaped slope 57 along the airflow direction. These ribs can divide the wide airflow into several narrower, more stable airflows, effectively suppressing lateral boundary layer separation and the generation of unstable vortices, further enhancing airflow stability and noise reduction.

[0036] Furthermore, as a preferred embodiment of this solution and not a limitation, the rubber sleeve 7 is provided with a connecting hole 74, and the lower housing 2 of the body is provided with a connecting hole post 22 corresponding to the connecting hole 74. The fastener passes through the connecting hole 74 and the connecting hole post 22 to connect the rubber sleeve 7 and the lower housing 2 of the body.

[0037] In this embodiment, fasteners are passed through the connecting holes 74 of the rubber sleeve 7 and fixed to the connecting posts 22 of the lower housing 2. The working principle utilizes the strong and durable axial clamping force provided by the fasteners, such as screws, to firmly press and fix the flexible rubber sleeve 7 onto the housing, forming a reliable mechanical connection. The core advantage of this design is that it provides connection strength and reliability far exceeding that of ordinary snap-fit ​​or embedded structures, effectively resisting loosening and separation caused by long-term equipment vibration or accidental impact. Simultaneously, this connection method offers good maintainability, allowing maintenance personnel to easily replace the entire fan and rubber sleeve assembly by disassembling the fasteners, solving the problem of difficult maintenance with permanent or semi-permanent connection methods.

[0038] The working principle of this embodiment is as follows: This application discloses a silent air duct device for a window cleaning robot. By adding an air duct component and integrating it with the robot's outer shell to form an independent air cavity and air outlet channel, multiple sound-absorbing holes on the air duct component effectively absorb and dissipate the sound waves propagating within the air cavity when the high-speed airflow generated by the fan carries noise into the air cavity. This significantly reduces noise before the airflow exits the outlet. This design is simple in structure and highly integrated, reducing the overall operating noise of the machine without adding additional complex components, providing users with a quieter and more comfortable user experience.

[0039] The above are implementation methods provided in conjunction with specific content, and it is not intended that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A silent air duct device for a window cleaning robot, characterized in that, The device includes a lower housing (2) with an air inlet (1) at the bottom, an upper housing (4) connected to the lower housing (2) and having an air outlet (3), a duct component (5) connected to the upper housing (4), and a fan assembly (6) connected to the duct component (5) and located between the air inlet (1) and the duct component (5). The duct component (5) is connected to the upper housing (4) to form an air cavity (51) and an air outlet channel (52) connecting the air cavity (51) and the air outlet (3). The duct component (5) is provided with a plurality of silencers (53) corresponding to the air cavity (51).

2. The silent air duct device for a window cleaning robot according to claim 1, characterized in that, The air duct component (5) has a first opening (54) in the middle of the air inlet (1), and the sound-absorbing holes (53) are arranged in a ring array around the first opening (54).

3. The silent air duct device for a window cleaning robot according to claim 1, characterized in that, The air cavity (51) is provided with a sound-absorbing medium (55), and the middle part of the sound-absorbing medium (55) is provided with a second opening (551) corresponding to the air inlet (1).

4. The silent air duct device for a window cleaning robot according to claim 1, characterized in that, The air outlet channel (52) is provided with a plurality of sound-absorbing fins (56) arranged symmetrically to each other. Two of the sound-absorbing fins (56) arranged symmetrically to each other gradually narrow the air outlet channel (52) along the air outlet direction.

5. The silent air duct device for a window cleaning robot according to claim 1, characterized in that, It also includes a rubber sleeve (7) fitted on the outside of the fan assembly (6).

6. The silent air duct device for a window cleaning robot according to claim 5, characterized in that, The outer side wall of the fan assembly (6) is provided with a plurality of snap-fit ​​protrusions (61), and the inner side wall of the rubber sleeve (7) is provided with a plurality of snap-fit ​​interfaces (71) for the snap-fit ​​protrusions (61) to snap into. The snap-fit ​​protrusions (61) are snapped into the snap-fit ​​interfaces (71) to connect the fan assembly (6) and the rubber sleeve (7).

7. The silent air duct device for a window cleaning robot according to claim 5, characterized in that, The lower casing (2) of the fuselage is provided with a limiting groove (21) for the bottom of the rubber sleeve (7) to be inserted. The rubber sleeve (7) is located between the fan assembly (6) and the lower casing (2).

8. The silent air duct device for a window cleaning robot according to claim 7, characterized in that, The bottom of the limiting groove (21) is provided with a flange (211) arranged in its circumferential direction, and the bottom of the rubber sleeve (7) is provided with a groove (72); or the bottom of the rubber sleeve (7) is provided with a flange (211) arranged in its circumferential direction, and the bottom of the limiting groove (21) is provided with a groove (72), and the flange (211) is inserted into the groove (72) to seal the lower shell (2) of the body and the rubber sleeve (7).

9. The silent air duct device for a window cleaning robot according to claim 1, characterized in that, The air duct component (5) has an arc-shaped slope (57) that extends upward to the air outlet (3) at the end of the air outlet channel (52).

10. A silent air duct device for a window cleaning robot according to claim 5, characterized in that, The rubber sleeve (7) is provided with a connecting hole (74), and the lower shell (2) of the body is provided with a connecting hole post (22) corresponding to the connecting hole (74). The fastener passes through the connecting hole (74) and the connecting hole post (22) to connect the rubber sleeve (7) and the lower shell (2).

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