Motor noise reduction structure of a handheld wireless dust collector

Abstract

The utility model discloses a hand -held wireless dust catcher's motor noise reduction structure. It includes: motor, motor cover, the motor is located at the inside of motor cover, first elastic soft glue body and second elastic soft glue body, first elastic soft glue body with second elastic soft glue body is arranged respectively in the axial both ends of motor, the axial both ends of motor are fixed support respectively by first elastic soft glue body with second elastic soft glue body in the inside of motor cover. The utility model has the beneficial effect that: effectively absorbs and attenuates the mechanical vibration that the motor produces in the high -speed rotation process, significantly reduces the solid sound transmission and radiation noise that is caused by structure resonance, restrains the transmission of high -frequency noise, avoids airflow separation, vortex shedding and turbulence enhancement phenomenon, absorbs airflow impact energy, effectively suppresses the generation and propagation of pneumatic noise, significantly reduces wideband noise, especially the peak noise of medium frequency band.

Description

Technical Field

[0001] This utility model relates to the technical field of noise reduction for vacuum cleaner motors, and in particular to a noise reduction structure for a handheld cordless vacuum cleaner motor. Background Technology

[0002] Handheld cordless vacuum cleaners have gradually become the mainstream tool for household cleaning due to their freedom from power cords and flexible operation. However, limited by their compact structural design, high-speed motors, and space constraints in the air duct system, handheld cordless vacuum cleaners generally generate significant aerodynamic and mechanical noise during operation, seriously affecting the user experience.

[0003] In existing technologies, the noise of handheld cordless vacuum cleaners mainly comes from the following aspects: 1. High-speed motor operating noise: Brushless DC motors generate high-frequency electromagnetic noise and mechanical vibration at high speeds, which is especially noticeable during load changes or startup; 2. Aerodynamic noise: When airflow passes through narrow ducts, cyclone separators, filter components, and exhaust vents at high speed, it generates turbulence, eddies, and airflow impact, causing mid-to-high frequency broadband noise; 3. Structural resonance noise: The vacuum cleaner casing and internal motor structure resonate under high-frequency vibration excitation, amplifying noise radiation; 4. Vent noise: Some products do not have effective sound-absorbing structures in the motor cover vent, causing airflow to pass through directly at high speed, forming a significant aerodynamic noise source.

[0004] In summary, there is a need for a motor noise reduction structure for handheld cordless vacuum cleaners that can effectively reduce noise. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art and provides a motor noise reduction structure for a handheld cordless vacuum cleaner that can effectively reduce noise.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A noise reduction structure for the motor of a handheld cordless vacuum cleaner includes: Electric motor; A motor housing, wherein the motor is disposed inside the motor housing; A first elastic soft gel and a second elastic soft gel are respectively disposed at both ends of the axial direction of the motor, and the two ends of the axial direction of the motor are respectively fixedly supported inside the motor cover by the first elastic soft gel and the second elastic soft gel.

[0007] A flexible suspension structure is formed for the motor by the first and second elastic soft rubber bodies. This structure can effectively absorb and attenuate the mechanical vibration generated by the motor during high-speed rotation, and significantly reduce solid-borne and radiated noise caused by structural resonance.

[0008] Preferably, the motor cover includes a first cover and a second cover. The motor is placed inside the second cover. The first cover is fixed to the port portion of the second cover. A first elastic soft rubber body is fixed to the inner bottom surface of the first cover. One end of the motor is fixedly supported on the inner side of the first cover by the first elastic soft rubber body. The second elastic soft rubber body is fixed to the outer bottom surface of the second cover. The bottom surface of the second cover has a cover through hole. A limiting support block is fixed on the second elastic soft rubber body. The limiting support block passes through the cover through hole and is placed inside the second cover. The other end face of the motor has a limiting groove that matches the limiting support block. The other end of the motor is fixedly supported on the inner side of the second cover through the installation and cooperation of the limiting support block and the limiting groove. Both the first cover and the first elastic soft rubber body are provided with ventilation holes for airflow. The impeller on the motor is positioned directly opposite the ventilation holes.

[0009] Preferably, the bottom surface of the second cover is also provided with several primary filter holes. The microporous structure of the primary filter holes scatters and interferes with the high-frequency sound wave components in the airflow, initially disrupting the propagation path of the sound waves and shortening their effective wavelength, thereby suppressing the transmission of high-frequency noise to a certain extent.

[0010] Preferably, a circumferential flange is fixed to the outer wall of the second cover, located at the bottom of the second cover. The second elastic soft rubber body is bowl-shaped, and the outer edge of the circumferential flange is adapted to and fixedly connected to the opening of the second elastic soft rubber body. The side of the second elastic soft rubber body facing the second cover adopts a smooth arc transition design. The airflow rectified by the first-stage filter plate enters the inner side of the second elastic soft rubber body. The inner wall of the second elastic soft rubber body adopts a large curvature rounded corner transition design to avoid local airflow separation, vortex shedding, and turbulence enhancement caused by right angle or acute angle structures. In addition, the second elastic soft rubber body is made of soft rubber material, which has certain damping characteristics and can further absorb the impact energy of the airflow; at the same time, its elastic deformation capability can produce small deformations under the action of airflow pulsation, playing a passive pressure regulation and buffering role, effectively suppressing the generation and propagation of aerodynamic noise.

[0011] Preferably, the circumferential flange is provided with a plurality of secondary filter holes, the distribution density of which is greater than that of the primary filter holes on the bottom surface of the second cover. The airflow then enters the secondary filter holes on the circumferential flange, which have a finer pore size distribution in their structure, further reflecting and dissipating residual mid-to-high frequency noise, forming a second acoustic barrier.

[0012] Preferably, a sound-absorbing sponge is fitted and fixed to the outer side of the second cover, with the end face and circumferential flange of the sound-absorbing sponge fitting together. The sound-absorbing sponge has a mesh-like structure. At the rear of the secondary filter holes, a sound-absorbing sponge is disposed adjacent to it. This sound-absorbing sponge is configured with a high porosity porous mesh structure, which can convert sound energy into heat energy through viscous dissipation and heat conduction mechanisms, significantly reducing broadband noise, especially peak noise in the mid-frequency range.

[0013] The beneficial effects of this invention are: it effectively absorbs and attenuates the mechanical vibration generated by the motor during high-speed rotation, significantly reduces solid-borne and radiated noise caused by structural resonance; it suppresses the transmission of high-frequency noise; it avoids airflow separation, eddy shedding, and turbulence enhancement; it absorbs airflow impact energy; it effectively suppresses the generation and propagation of aerodynamic noise; and it significantly reduces broadband noise, especially peak noise in the mid-frequency band. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention; Figure 2 This is the front view of this utility model; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 This is a schematic diagram of the second cover.

[0015] In the diagram: 1. Motor, 2. First elastic soft rubber body, 3. Second elastic soft rubber body, 4. First cover, 5. Second cover, 6. Cover through hole, 7. Limiting support block, 8. Limiting groove, 9. Primary filter hole, 10. Circumferential flange, 11. Secondary filter hole, 12. Sound-absorbing sponge, 13. Ventilation hole, 14. Impeller. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1-4 In the embodiments described above, a motor noise reduction structure for a handheld cordless vacuum cleaner includes: Motor 1; Motor cover, motor 1 is installed inside the motor cover; The first elastic soft gel 2 and the second elastic soft gel 3 are respectively disposed at both ends of the axial direction of the motor 1, and the two ends of the axial direction of the motor 1 are respectively fixedly supported inside the motor cover by the first elastic soft gel 2 and the second elastic soft gel 3.

[0018] The motor cover includes a first cover 4 and a second cover 5. The motor 1 is placed inside the second cover 5. The first cover 4 is fixed to the port of the second cover 5. A first elastic soft rubber body 2 is fixed to the inner bottom surface of the first cover 4. One end of the motor 1 is fixedly supported on the inner side of the first cover 4 by the first elastic soft rubber body 2. A second elastic soft rubber body 3 is fixed on the outer bottom surface of the second cover 5. The bottom surface of the second cover 5 is provided with a cover through hole 6. A limiting support block 7 is fixed on the second elastic soft rubber body 3. The limiting support block 7 passes through the cover through hole 6 and is placed inside the second cover 5. The other end face of the motor 1 is provided with a limiting groove 8 that matches the limiting support block 7. The other end of the motor 1 is fixedly supported on the inner side of the second cover 5 by the installation and cooperation of the limiting support block 7 and the limiting groove 8. Both the first cover 4 and the first elastic soft rubber body 2 are provided with ventilation holes 13 for airflow. The impeller 14 on the motor 1 is positioned directly opposite the ventilation holes 13.

[0019] Several primary filter holes 9 are also provided on the bottom surface of the second cover 5.

[0020] A circumferential flange 10 is fixed on the outer wall of the second cover 5. The circumferential flange 10 is located at the bottom of the second cover 5. The second elastic soft rubber body 3 is a bowl-shaped cover. The outer edge of the circumferential flange 10 is adapted to and fixedly connected with the opening of the second elastic soft rubber body 3. The side of the second elastic soft rubber body 3 facing the second cover 5 adopts a smooth arc transition design.

[0021] The circumferential flange 10 is provided with a number of secondary filter holes 11. The distribution density of the secondary filter holes 11 on the circumferential flange 10 is greater than the distribution density of the primary filter holes 9 on the bottom surface of the second cover 5.

[0022] The outer side of the second cover 5 is fitted with a sound-absorbing sponge 12. The end face of the sound-absorbing sponge 12 is in contact with the circumferential flange 10. The sound-absorbing sponge 12 has a mesh-like structure.

[0023] The two ends of the motor 1 are fixedly supported inside the motor cover by the first elastic soft rubber body 2 and the second elastic soft rubber body 3, respectively, forming a flexible suspension structure for the motor 1. This structure can effectively absorb and attenuate the mechanical vibration generated by the motor 1 during high-speed rotation, and significantly reduce the solid-borne sound and radiation noise caused by structural resonance.

[0024] The bottom surface of the second cover 5 is provided with a primary filter hole 9. Its microporous structure scatters and interferes with the high-frequency sound wave components in the airflow, initially disrupting the propagation path of the sound waves and shortening their effective wavelength, thereby suppressing the transmission of high-frequency noise to a certain extent. The airflow rectified by the primary filter hole 9 enters the flexible air duct made of soft rubber material (i.e., the inner side of the second elastic soft rubber body 3). Its inner wall adopts a large curvature rounded corner transition design to avoid local airflow separation, vortex shedding, and turbulence enhancement caused by right angle or acute angle structures. In addition, the soft rubber material itself has certain damping characteristics, which can further absorb the impact energy of the airflow and its elastic deformation energy. The force can produce slight deformation under the action of airflow pulsation, playing a passive pressure regulation and buffering role, effectively suppressing the generation and propagation of aerodynamic noise; the airflow then enters the secondary filter hole 11 on the circumferential flange 10. The secondary filter hole 11 has a finer pore size distribution in its structure, which further reflects and dissipates the residual mid-to-high frequency noise, forming a second acoustic barrier; at the rear of the secondary filter hole 11, a sound-absorbing sponge 12 is arranged adjacent to it. The sound-absorbing sponge 12 is configured as a porous mesh structure with a high porosity, which can convert sound energy into heat energy through viscous dissipation and heat conduction mechanisms, significantly reducing broadband noise, especially the peak noise in the mid-frequency band.

[0025] Through the aforementioned multi-stage series noise reduction structure, this application achieves synergistic suppression of motor mechanical noise and aerodynamic noise without significantly increasing system volume and wind resistance, thereby improving the quietness performance of the vacuum cleaner.

Claims

1. A noise reduction structure for the motor of a handheld cordless vacuum cleaner, characterized in that, include: Motor (1); Motor cover, wherein the motor (1) is disposed inside the motor cover; The first elastic soft gel (2) and the second elastic soft gel (3) are respectively disposed at both ends of the axial direction of the motor (1). The two ends of the axial direction of the motor (1) are respectively fixedly supported inside the motor cover by the first elastic soft gel (2) and the second elastic soft gel (3).

2. The motor noise reduction structure for a handheld cordless vacuum cleaner according to claim 1, characterized in that, The motor cover includes a first cover (4) and a second cover (5). The motor (1) is placed inside the second cover (5). The first cover (4) is fixed at the port of the second cover (5). The first elastic soft rubber (2) is fixed on the inner bottom surface of the first cover (4). One end of the motor (1) is fixedly supported on the inner side of the first cover (4) by the first elastic soft rubber (2). The second elastic soft rubber (3) is fixed on the outer bottom surface of the second cover (5). The bottom surface of the second cover (5) is provided with a cover through hole (6). A limit support block (7) is fixed on the second elastic soft rubber (3). The limit support block (7) passes through the cover through hole (6) and is placed inside the second cover (5). The other end of the motor (1) is provided with a limit groove (8) that matches the limit support block (7). The other end of the motor (1) is fixedly supported on the inner side of the second cover (5) by the installation and cooperation of the limit support block (7) and the limit groove (8).

3. The motor noise reduction structure for a handheld cordless vacuum cleaner according to claim 2, characterized in that, The bottom surface of the second cover (5) is also provided with several primary filter holes (9).

4. The motor noise reduction structure for a handheld cordless vacuum cleaner according to claim 3, characterized in that, A circumferential flange (10) is fixed on the outer wall of the second cover (5). The circumferential flange (10) is located at the bottom of the second cover (5). The second elastic soft rubber body (3) is a bowl-shaped cover. The outer edge of the circumferential flange (10) is adapted to and fixedly connected with the opening of the second elastic soft rubber body (3). The side of the second elastic soft rubber body (3) facing the second cover (5) adopts a smooth arc transition design.

5. The motor noise reduction structure for a handheld cordless vacuum cleaner according to claim 4, characterized in that, The circumferential flange (10) is provided with a plurality of secondary filter holes (11), and the distribution density of the secondary filter holes (11) on the circumferential flange (10) is greater than the distribution density of the primary filter holes (9) on the bottom surface of the second cover (5).

6. The motor noise reduction structure for a handheld cordless vacuum cleaner according to claim 5, characterized in that, The outer side of the second cover (5) is fitted with a sound-absorbing sponge (12), the end face of the sound-absorbing sponge (12) and the circumferential flange (10) are in contact, and the sound-absorbing sponge (12) has a mesh-like structure.

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