A shock-absorbing structure for plastic ducts of sweeping machines

Abstract

This utility model discloses a vibration damping structure for plastic ducts used in sweeping machines, belonging to the field of noise reduction technology for plastic ducts. It includes a duct body, a damping structure, and a noise reduction structure. The duct body comprises a straight section and a curved section. The damping structure includes a damping coating on the inner wall of the straight section and a damping sheet fixedly connected to the outer wall of the duct. The noise reduction structure includes a honeycomb mesh sleeved on the outside of the duct body and sound-absorbing cotton filled between the honeycomb mesh and the damping sheet. The inner wall of the straight section is provided with several spaced-apart annular reinforcing ribs, and the inner wall of the curved section is provided with multiple guide ribs along the airflow direction. Through the damping structure, a damping and vibration reduction effect is achieved, reducing the noise generated by vibration. The noise reduction structure can block the transmission of duct vibration to the surrounding air, absorb the air vibration generated by the duct vibration, and simultaneously absorb the sound waves generated by the vibration, reducing the noise generated when the duct is working.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology for plastic air ducts, specifically a shock-absorbing structure for plastic air ducts used in sweeping machines. Background Technology

[0002] In the vacuuming system of a sweeper, the plastic duct is the core component connecting the fan and the suction port. Its main function is to transport dust and debris from the ground to the dust collection box via airflow. However, in actual use, existing plastic ducts in sweepers generally suffer from noise caused by vibration and structural stability issues.

[0003] For example, when a robot vacuum is working, the vibration generated by the high-speed operation of the fan is directly transmitted to the duct. At the same time, the airflow is prone to turbulence when flowing inside the duct (especially in bends and where the duct diameter changes), and the airflow impacts the inner wall of the duct, generating secondary vibrations. These two types of vibration are transmitted to the machine body and the surrounding air through the duct body, and the vibration will produce obvious noise, affecting the user experience.

[0004] Therefore, how to design a shock-absorbing structure for the plastic duct of a sweeping machine has become a problem we need to solve. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a shock-absorbing structure for plastic ducts of sweeping machines, solving the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a shock-absorbing structure for a plastic duct of a sweeper, comprising a duct body, a damping structure and a noise reduction structure, wherein the duct body comprises a straight duct section and a curved duct section, and the damping structure comprises a damping coating disposed on the inner wall of the straight duct section and a damping film fixedly connected to the outer wall of the duct body.

[0009] The noise reduction structure includes a honeycomb mesh sleeved on the outside of the tube and sound-absorbing cotton filled between the honeycomb mesh and the damping film.

[0010] Preferably, the damping coating is an aqueous polyurethane damping adhesive.

[0011] Preferably, the damping sheet is butyl rubber.

[0012] Preferably, the inner wall of the straight pipe section is provided with a plurality of annular reinforcing ribs distributed at intervals, and the cross-section of the annular reinforcing ribs is semi-circular.

[0013] Preferably, the protruding height of the annular reinforcing rib does not exceed 1 / 10 of the inner diameter of the straight pipe section.

[0014] Preferably, the inner wall of the bend section is provided with multiple guide ribs along the airflow direction, and the cross-section of the guide ribs is semi-circular.

[0015] (III) Beneficial Effects

[0016] This utility model provides a shock-absorbing structure for plastic air ducts of sweeping machines, which has the following beneficial effects:

[0017] This invention utilizes a damping structure. When airflow carries dust within the duct, the damping coating converts the vibration energy of the wall surface into heat energy through molecular friction within the material. When the duct vibrates, the molecules inside the damping film generate damping force due to friction, directly consuming the vibration energy, thereby achieving a damping and vibration reduction effect and reducing the noise generated by vibration.

[0018] This invention, through the design of a noise reduction structure, can block the transmission of duct vibration to the surrounding air. The sound-absorbing cotton absorbs the air vibration generated by the duct vibration through fiber friction, and at the same time absorbs the sound waves generated by the vibration, thereby reducing the noise generated when the duct is working. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This utility model Figure 2 Enlarged view of the structure at point A in the middle.

[0022] In the diagram: 1. Pipe body; 11. Straight pipe section; 12. Bend pipe section; 13. Annular reinforcing rib; 14. Flow guide rib; 2. Damping structure; 21. Damping coating; 22. Damping film; 3. Noise reduction structure; 31. Honeycomb mesh; 32. Sound-absorbing cotton. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0026] like Figure 1-3 As shown, this utility model provides a technical solution: a shock-absorbing structure for a plastic duct of a sweeper, including a duct body 1, a damping structure 2 and a noise reduction structure 3. The duct body 1 includes a straight section 11 and a bent section 12, and the two ends of the duct body 1 are respectively connected to a fan and a suction nozzle.

[0027] Specifically, the damping structure 2 includes a damping coating 21 disposed on the inner wall of the straight pipe section 11 and a damping sheet 22 fixedly connected to the outer wall of the pipe body 1. The damping coating 21 is a water-based polyurethane damping adhesive, which is sprayed onto the inner wall of the straight pipe section 11. The damping sheet 22 is butyl rubber. Through the setting of the damping structure 2, when the airflow carries dust to flow in the pipe body 1, the damping coating 21 converts the wall vibration energy into heat energy consumption through molecular friction inside the material. When the duct vibrates, the molecules inside the damping sheet 22 generate damping force due to friction, directly consuming the vibration energy, thereby achieving the damping and vibration reduction effect and reducing the noise generated by vibration.

[0028] Specifically, the noise reduction structure 3 includes a honeycomb mesh 31 sleeved on the outside of the pipe body 1 and sound-absorbing cotton 32 filled between the honeycomb mesh 31 and the damping film 22. By setting the noise reduction structure 3, the transmission of duct vibration to the surrounding air can be blocked. The sound-absorbing cotton 32 absorbs the air vibration generated by the duct vibration through fiber friction and absorbs the sound waves generated by the vibration, thereby reducing the noise generated when the duct is working.

[0029] Furthermore, the inner wall of the straight pipe section 11 is provided with several spaced annular reinforcing ribs 13. The annular reinforcing ribs 13 are integrally injection molded with the inner wall of the duct. By setting the annular reinforcing ribs 13, the local thickness and rigidity of the inner wall of the duct can be increased. When the airflow impacts the inner wall, the annular reinforcing ribs 13 can disperse the stress, avoid the wall surface from vibrating continuously due to elastic deformation, and reduce resonance.

[0030] Specifically, the cross-section of the annular reinforcing rib 13 is semi-circular to reduce wind resistance and prevent dust accumulation. The protruding height of the annular reinforcing rib 13 does not exceed 1 / 10 of the inner diameter of the straight pipe section 11 to ensure the effective flow area of ​​the duct inner diameter and avoid excessive wind resistance that reduces dust collection efficiency.

[0031] Furthermore, the inner wall of the bend section 12 is provided with multiple guide ribs 14 along the airflow direction. By setting the guide ribs 14, the airflow can be guided to turn smoothly along the inner wall of the bend section 12, and the turbulent airflow can be sorted into an orderly flow state. This reduces the force of the airflow hitting the outer inner wall due to centrifugal force when turning, thereby reducing the vibration caused by the airflow impact.

[0032] Specifically, the cross-section of the guide rib 14 is semi-circular to reduce wind resistance and prevent dust accumulation.

[0033] The working process of this utility model is as follows: The guide ribs 14 guide the airflow to smoothly turn along the inner wall of the curved section 12, transforming the turbulent airflow into an orderly flow pattern. This reduces the impact force of centrifugal force on the outer inner wall during the turn, thereby reducing vibration caused by airflow impact. The annular reinforcing ribs 13 increase the local thickness and rigidity of the duct's inner wall. When the airflow impacts the inner wall, the annular reinforcing ribs 13 disperse stress, preventing continuous vibration due to elastic deformation of the wall surface and reducing resonance. When the airflow carries dust within the duct body 1, the damping coating 21 converts the wall vibration energy into heat energy through molecular friction within the material. When the duct vibrates, the molecules within the damping film 22 generate damping force due to friction, directly consuming vibration energy, thus achieving a damping and vibration reduction effect and reducing noise generated by vibration. The noise reduction structure 3 blocks the transmission of duct vibration to the surrounding air. The sound-absorbing cotton 32 absorbs air vibration generated by duct vibration through fiber friction and simultaneously absorbs sound waves generated by vibration, reducing noise generated during duct operation.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A damping structure for a plastic air duct of a floor sweeping machine, comprising a duct body (1), a damping structure (2) and a noise reduction structure (3), characterized in that: The pipe body (1) includes a straight pipe section (11) and a bent pipe section (12). The damping structure (2) includes a damping coating (21) disposed on the inner wall of the straight pipe section (11) and a damping film (22) fixedly connected to the outer wall of the pipe body (1). The noise reduction structure (3) includes a honeycomb mesh (31) sleeved on the outside of the tube (1) and sound-absorbing cotton (32) filled between the honeycomb mesh (31) and the damping film (22).

2. The shock absorbing structure for a plastic air duct of a floor sweeping machine according to claim 1, wherein: The damping coating (21) is an aqueous polyurethane damping adhesive.

3. The shock absorbing structure for a plastic air duct of a floor sweeping machine according to claim 1, wherein: The damping sheet (22) is butyl rubber.

4. The shock absorbing structure for a plastic air duct of a floor sweeping machine according to claim 1, wherein: The inner wall of the straight pipe section (11) is provided with a number of annular reinforcing ribs (13) distributed at intervals, and the cross section of the annular reinforcing ribs (13) is semi-circular.

5. The shock absorbing structure for a plastic air duct of a floor sweeping machine according to claim 4, wherein: The protruding height of the annular reinforcing rib (13) shall not exceed 1 / 10 of the inner diameter of the straight pipe section (11).

6. The shock absorbing structure for a plastic air duct of a floor sweeping machine according to claim 1, wherein: The inner wall of the bend section (12) is provided with multiple guide ribs (14) along the airflow direction, and the cross section of the guide ribs (14) is semi-circular.

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