Dust collector capable of reducing noise

Abstract

The invention discloses a dust collector capable of reducing noise, and relates to the field of life electric appliances, the dust collector capable of reducing noise mainly comprises a motor body, a fan and a motor cover, the motor body drives the fan to rotate with a rotating shaft as the center, and the motor cover covers the outer sides of the motor body and the fan. The front end of the motor cover is provided with an air inlet, the rear end of the motor cover is provided with an air outlet, a motor air duct is arranged between the air inlet and the air outlet, airflow entering from the air inlet flows along the motor air duct and is discharged from the air outlet, and at least two radial air outlet ducts are distributed on the rear side of the motor cover in the circumferential direction of the air outlet. The radial air outlet duct extends from inside to outside on the radial plane of the motor cover, the outer air outlet end faces the radial outer side, the inner air inlet end and the outer air outlet end of the radial air outlet duct are located at different radial positions so as to prolong the length of the radial air outlet duct, airflow exhausted from the air outlet flows along the radial air outlet duct, and airflow noise is gradually reduced. The noise of the dust collector is reduced.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, and particularly to a vacuum cleaner with reduced noise. Background Art

[0002] As an efficient cleaning tool, vacuum cleaners are widely used in daily life. Their main working principle is to drive the blades to rotate at high speed by an electric motor, generate negative air pressure in a sealed housing, and then suck dust through an external suction tube. However, such a working method usually generates a lot of noise, which mainly comes from the power source and the pneumatic noise generated by the high-speed airflow in the whole machine.

[0003] Most of the conventional methods for reducing the pneumatic noise of vacuum cleaners are to set sound-absorbing sponges or sound-absorbing components made of other sound-absorbing materials at the air inlet end and the air outlet end of the vacuum cleaner motor. For example, a vacuum cleaner disclosed in the prior art CN107456154A includes a vacuum cleaner housing. A dust suction channel is provided inside the vacuum cleaner housing. A dust suction port and an air outlet are provided at both ends of the dust suction channel. The dust suction port and the air outlet are provided on the inner wall of the vacuum cleaner housing. Inside the dust suction channel, a dust suction box for collecting dust, a suction fan blade, and a motor cover are sequentially arranged according to the dust suction direction. A motor is installed inside the motor cover. The rotating shaft of the motor extends outside the motor cover and is electrically connected to the suction fan blade. A first sound-absorbing structure and a second sound-absorbing structure are respectively provided on the inner wall and the outer wall of the motor cover. A third sound-absorbing structure is provided on the inner wall of the vacuum cleaner housing, and the third sound-absorbing structure extends to the dust suction port and the air outlet. The dust suction box is in the shape of a cylinder with openings at both ends, including a box body, a front cover, and a rear cover. The front cover and the rear cover are respectively connected to the box body. The front cover is provided with dust suction holes. Two mesh plates are provided inside the box body. A filter is provided between the two mesh plates. The rear cover is provided with air outlet holes. A handle is detachably connected to the vacuum cleaner housing. A receiving space is provided on the handle. A wire winder is provided in the receiving space. The wire winder includes two fixing plates and a rotating shaft provided between the two fixing plates. A rocker is provided on the outer wall of the handle. The rocker is connected to the rotating shaft. The rotation of the rocker drives the rotation of the rotating shaft. A receiving groove is further provided on the outer wall of the handle. The rocker is received in the receiving groove. The motor cover includes an outer cover and an inner cover. The outer cover is suspended inside the dust suction channel. The inner cover is suspended inside the outer cover. The motor is installed on the inner cover. Sponge is filled between the inner cover and the outer cover. In this prior art, the first sound-absorbing structure includes a closed-cell foam plastic layer, the second sound-absorbing structure includes an open-cell foam plastic layer, and the third sound-absorbing structure is a hollow microsphere material. By setting the first sound-absorbing structure, the second sound-absorbing structure, and the third sound-absorbing structure, the generation of noise during the use of the vacuum cleaner can be reduced, and the soundproof performance of the vacuum cleaner can be improved. The motor cover is provided with an outer cover, an inner cover, and the sponge between the outer cover and the inner cover, which can increase the shockproof effect and thus reduce the generation of noise. However, when the air flow discharges from the air outlet, the noise generated due to the impact of the air flow is relatively large. Only by using the sound-absorbing structure and the sound-absorbing sponge made of sound-absorbing materials for noise reduction, the noise reduction points are few, and the air flow velocity filtered by the sound-absorbing materials and the sound-absorbing sponge is still very large, and a good sound-absorbing effect cannot be achieved. Summary of the Invention

[0004] The object to be achieved by the present invention is to provide a vacuum cleaner with reduced noise to solve the problem of relatively large noise of the vacuum cleaner.

[0005] To achieve the above object, the present invention adopts the following technical solution: A vacuum cleaner for reducing noise, comprising a motor body, a fan, and a motor cover. The motor body drives the fan to rotate around a rotation axis. The motor cover is disposed outside the motor body and the fan. The front end of the motor cover is provided with an air inlet, and the rear end is provided with an air outlet. An air duct for the motor is provided between the air inlet and the air outlet. The air flow entering from the air inlet flows along the air duct for the motor and is discharged from the air outlet. At least two radial air outlet ducts are circumferentially distributed along the air outlet at the rear side of the motor cover. The radial air outlet ducts extend from the inside to the outside in the radial plane of the motor cover, and the outer air outlet ends face radially outward. The inner air inlet ends and the outer air outlet ends of the radial air outlet ducts are at different radial positions to extend the length of the radial air outlet ducts. The air flow discharged from the air outlet flows along the radial air outlet ducts and gradually reduces the air flow noise.

[0006] After adopting the above technical solution, the present invention has the following advantages: The air flow enters the air duct for the motor from the air inlet and then blows to the air outlet. The ingeniously arranged air duct for the motor and the air outlet duct between the air inlet and the air outlet can effectively guide and control the flow direction of the air flow, so that the air flow will flow along the radial air outlet ducts after passing through the air duct for the motor. Among them, the radial air outlet ducts extend from the inside to the outside in the radial plane of the motor cover. Such a design can form a relatively long air duct to guide the air flow without adding additional radial space. Then, by designing that the inner air inlet ends and the outer air outlet ends of the radial air outlet ducts are at different radial positions, the air flow does not directly blow out radially, but turns and flows between the inner air inlet ends and the outer air outlet ends. Such a design can not only make the air flow turn during the flow in the radial air outlet ducts, but also reduce the amplitude of the air flow, thereby suppressing the whistling sound and reducing the noise. Thus, the inner air inlet ends and the outer air outlet ends are staggered in different circumferences, greatly extending the length of the radial air outlet ducts. The air flow has a relatively long flow path along the radial air outlet ducts, and the air flow noise can be gradually reduced on a relatively long path. In addition, since the outer air outlet ends face radially outward, the interaction between the air flows discharged from adjacent outer air outlet ends can be avoided, which is beneficial to noise reduction.

[0007] Further, a curve extension portion is provided between the inner air inlet end and the outer air outlet end of the radial air outlet duct. The curve extension portion extends in a curve and forms a turning portion at the connection positions with the inner air inlet end and the outer air outlet end. The flow direction of the air flow is changed through the turning portion while the air flow noise is reduced.

[0008] With the above technical solution, the design of the curve extension part lengthens the length of the air outlet duct. The airflow has a relatively long flow path along the radial air outlet duct, which can reduce the airflow speed. At the same time, the curve design is beneficial to slowing down the impact of the airflow on the air outlet duct, thereby reducing noise. The airflow flows along the air outlet duct and changes its direction when passing through the turning part. Compared with straight-line flow, the sound waves generated by the airflow with multiple turns cannot propagate along a single direction, so the amplitude of the sound waves decreases, the whistling sound is effectively suppressed, and the sound propagation efficiency is reduced. As a result, the noise generated during the airflow movement is reduced. Through reasonable structural design, not only can the airflow speed be reduced, but also the impact force generated during the airflow movement can be reduced. The impact between the airflow discharged from the vacuum cleaner to the outside and the outside air is weak, thus reducing the noise transmitted from the vacuum cleaner to the outside and improving the user experience.

[0009] Further, an air outlet cover for the motor is provided at the rear side of the motor cover, and a radial air outlet duct is formed between the rear end of the motor cover and the air outlet cover for the motor.

[0010] With the above technical solution, the setting of the air outlet cover for the motor provides a separated flow space for the airflow, so that the airflow discharged from the air outlet can be guided more effectively, making the airflow flow more orderly and reducing the generation of noise.

[0011] Further, a front end cover for the duct is provided at the rear end of the motor cover, and a rear end cover for the duct is provided on the air outlet cover for the motor; a front duct rib protruding backward is provided on the front end cover for the duct, and / or a rear duct rib is provided on the rear end cover for the duct; the front end cover for the duct, the rear end cover for the duct, and the front duct rib and / or the rear duct rib enclose to form a radial air outlet duct.

[0012] With the above technical solution, the radial air outlet duct formed by the combination of the front end cover for the duct provided on the rear motor cover and the rear end cover for the duct provided on the air outlet cover for the motor can effectively guide the airflow to flow orderly. Among them, the front duct rib is designed to protrude axially, forming a relatively long duct in the limited radial space, which helps to more effectively reduce the airflow speed, thereby reducing the generation of noise. Similarly, a rear duct rib with the same function as the front duct rib can also be set. The limited space enclosed by the front end cover for the duct, the rear end cover for the duct, the front duct rib and the rear duct rib, or the radial air outlet duct formed only by the front end cover for the duct, the rear end cover for the duct and the rear duct rib enclosing to form the air outlet duct can also achieve the effect of reducing noise.

[0013] Further, the air outlet protrudes upward from the front end cover for the duct, the air outlet cover for the motor is provided with an air outlet cylinder covering the outside of the air outlet, and a protruding part is provided on the radial outside of the rear end cover for the duct at the air outlet cylinder. The inside of the protruding part is communicated with the inside of the air outlet cylinder and the inner end of the radial air outlet duct.

[0014] With the foregoing technical solution, the interior of the convex portion is connected to the inner side of the air outlet cylinder and the inner end of the radial air outlet duct. Such a design can guide the airflow to make multiple turns in the duct, thereby effectively reducing the noise, restricting the path of noise propagation, and improving the noise reduction effect.

[0015] Furthermore, a rear positioning step is provided on the inner circle of the rear end of the motor cover, and a motor shock-absorbing ring is provided between the outer circle of the rear end of the motor body and the rear positioning step.

[0016] With the foregoing technical solution, the existence of the rear positioning step provides a mechanical isolation point on the inner circle of the rear end of the front motor cover to prevent vibration from being directly transmitted to other components or the housing. The motor shock-absorbing ring further provides buffering on the outer circle of the rear end of the motor body, effectively reducing the possibility of vibration being transmitted through the structure; the motor shock-absorbing ring is usually made of a flexible material, and the flexible material can absorb and reduce the transmission of motor vibration, reducing the noise caused by mechanical vibration. In this embodiment, the motor shock-absorbing ring is made of silicone material.

[0017] Furthermore, a motor shock-absorbing member is provided between the front end portion of the motor body and the inner wall of the front end portion of the motor cover.

[0018] With the foregoing technical solution, the motor shock-absorbing member acts as a buffer between the front end portion of the motor body and the inner wall of the front end portion of the motor, and can effectively isolate the mechanical vibration generated by the motor, reducing the possibility of motor vibration being transmitted through the structure to other parts of the vacuum cleaner, thereby reducing the noise generated by irregular vibration.

[0019] Furthermore, the motor shock-absorbing member is a shock-absorbing ring. A front positioning step for positioning the end face of the outer circle of the front end of the motor body is provided on the inner side of the front end portion of the motor cover. The shock-absorbing ring is sequentially provided with a radially extending portion and an axially extending portion in the front-rear direction. The radially extending portion is provided between the end face of the outer circle of the front end of the motor body and the front positioning step, and the axially extending portion is provided between the outer circle of the outer circle of the front end of the motor body and the inner side wall of the front motor cover.

[0020] With the foregoing technical solution, the existence of the front positioning step helps to ensure the correct position of the shock-absorbing ring, enhance the vibration isolation effect, and reduce the possibility of vibration being transmitted to the front motor cover; the shock-absorbing ring can provide a larger contact area to absorb and isolate mechanical vibration. Among them, the radially extending portion of the shock-absorbing ring is provided between the end face of the outer circle of the front end of the motor body and the front positioning step, and the axially extending portion of the shock-absorbing ring is provided between the outer circle of the outer circle of the front end of the motor body and the inner side wall of the front motor cover, which can prevent mechanical vibration from being transmitted to other components through the structure in multiple directions, improving the noise reduction effect. In addition, the combined design of the shock-absorbing ring and the motor shock-absorbing ring can more effectively isolate the vibration of the motor body and the fan, reducing the occurrence of mechanical vibration being conducted from the motor to other components, thereby reducing the possibility of generating structural noise. Combined with the design of the air outlet duct, the noise of the vacuum cleaner can be significantly reduced.

[0021] Further, a flared structure for guiding the air flow to concentrate towards the air outlet is provided on the front side of the air outlet of the motor cover; and / or, the motor cover includes a front motor cover and a rear motor cover, and a first sealing ring is provided between the rear motor cover and the front motor cover.

[0022] By adopting the foregoing technical solution, through the reasonable design of the geometric shape of the flared opening, the diffusion angle of the air flow and the sound wave can be adjusted, which helps to focus the generated air flow in one direction, reducing the possibility of the air flow and the sound wave generated during the air flow movement spreading in other directions, thereby reducing the generation of noise; through the reasonable design and layout of the first sealing ring, the sealing performance of the vacuum cleaner can be improved to a great extent, reducing the noise caused by the air flow and vibration, and providing a quieter use environment for the user.

[0023] Further, the motor body is connected with a cable, the cable passes through the air outlet and the radial air outlet duct, and a wiring groove is provided in the radial air outlet duct, and the cable is routed along the wiring groove.

[0024] By adopting the foregoing technical solution, by providing a wiring groove in the radial air outlet duct, the cable can be directly routed in the wiring groove, avoiding the need to set up additional wiring structures or brackets, simplifying the structure of the vacuum cleaner and the wiring process.

[0025] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the drawings:

[0027] Figure 1 is the front view of the present invention;

[0028] Figure 2 is the sectional view of the present invention;

[0029] Figure 3 is the exploded view (I) of the present invention;

[0030] Figure 4 is the exploded view (II) of the present invention;

[0031] Figure 5 is the structural schematic diagram (I) of the present invention;

[0032] Figure 6 is the structural schematic diagram (II) of the present invention;

[0033] Figure 7 is the top view of the present invention;

[0034] Figure 8 is the structural schematic diagram (I) of the rear motor cover in the present invention;

[0035] Figure 9 This is the second schematic structural view of the motor rear cover in the present invention;

[0036] Figure 10 This is the schematic structural view of the motor air outlet cover in the present invention;

[0037] Description of the drawings: Motor front cover 1, front positioning step 11, air inlet 12, rear positioning step 13, step end face 14, positioning ring groove 15, first screw mounting groove 16, clamping groove 17, screw 18, motor rear cover 2, inner air inlet end 211, curve extension part 212, outer air outlet end 213, air outlet 22, air duct front end cover 23, air duct front baffle rib 231, flange part 24, sealing groove 241, wiring groove 25, clamping rib 26, motor air outlet cover 3, air duct rear end cover 31, protruding part 311, inner side 3111, outer side 3112, air outlet cylinder 32, second screw mounting groove 33, wire clamping structure 34, motor shock-absorbing ring 4, groove 41, motor shock-absorbing part 5, radial extension part 51, axial extension part 52, small diameter section 521, large diameter section 522, radial rib 5221, motor body 6, first step part 61, second step part 62, cable 63, first sealing ring 7, second sealing ring 8, sound-absorbing part 9, motor air duct 100, radial air outlet duct 200. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention.

[0039] The terms "first", "second", etc. (if any) in the description and claims of the present invention are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily imply the existence of "first". It should be understood that in the present invention, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. It should be understood that in the present invention, "a plurality of" means two or more. "And / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, X and / or Y may represent: X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. "Including X, Y and Z", "including X, Y, Z" means that all of X, Y, and Z are included, "including X, Y or Z" means including any one of X, Y, and Z, and "including X, Y and / or Z" means including any one or any two or all three of X, Y, and Z.

[0040] The technical solution of the present invention will be described in detail below with specific embodiments.

[0041] As Figures 1 to 10 shown, the present invention provides a vacuum cleaner for reducing noise, including a motor body 6, a fan, and a motor cover. The motor body 6 drives the fan to rotate around a rotation axis. The motor cover is disposed outside the motor body 6 and the fan. An air inlet 12 is provided at the front end of the motor cover, and an air outlet 22 is provided at the rear end. An air duct 100 for the motor is provided between the air inlet 12 and the air outlet 22. The air flow entering from the air inlet 12 flows along the air duct 100 for the motor and is discharged from the air outlet 22. In this embodiment, as Figure 1 shown, arrow I is the outflow direction of the air flow. Radial air outlet ducts 200 are circumferentially spaced along the rear side of the rear motor cover 2 around the air outlet 22. As Figure 7As shown, there are a total of four radial air outlet ducts 200, including two outer ring ducts and two inner ring ducts. The flow path of the air flow in the outer ring duct is as shown by arrow II, and the flow path of the air flow in the inner ring duct is as shown by arrow III. The radial air outlet duct 200 introduces air flow through the air inlet end and discharges it from the air outlet 22. The radial air outlet duct 200 extends from the inside to the outside in the radial plane of the motor cover, and the outer air outlet end 213 faces radially outward. In this embodiment, the radial plane is a radial plane that extends perpendicular to the axis of the motor cover with the axis of the motor cover as the reference. The inner air inlet end 211 and the outer air outlet end 213 of the radial air outlet duct 200 are at different radial positions to extend the length of the radial air outlet duct 200. Different radial positions mean that the inner air inlet end 211 and the outer air outlet end 213 are divided into multiple radials along the circumferential direction in the radial plane. By different radial positions, the length of the air outlet duct 200 can be adjusted, thereby changing the flow path of the air flow. Thus, the air flow discharged from the air outlet 22 flows along the radial air outlet duct 200 and gradually reduces the air flow noise. The air flow enters the motor duct 100 from the air inlet 12 and then blows towards the air outlet 22. The ingeniously designed motor duct 100 and the air outlet duct 200 can effectively guide and control the flow direction of the air flow, so that the air flow will flow along the radial air outlet duct 200 after passing through the motor duct 100. The radial air outlet duct 200 extends from the inside to the outside in the radial plane of the motor cover. Such a design can form a duct with a relatively large length to guide the air flow without adding additional radial space. Further, through reasonable structural design, especially the design of the inner air inlet end 211 and the outer air outlet end 213 of the radial air outlet duct 200 at different radial positions, the air flow does not directly blow out radially, but turns and flows between the inner air inlet end 211 and the outer air outlet end 213. Such a design can not only make the air flow turn during the flow in the radial air outlet duct 200, but also reduce the amplitude of the air flow, suppress the whistling sound, and reduce the noise. Thus, the inner air inlet end 211 and the outer air outlet end 213 are staggered in different circumferential directions, greatly extending the length of the radial air outlet duct 200. The flow path of the air flow along the radial air outlet duct is relatively long, and the air flow noise can be gradually reduced on a relatively long path. In addition, since the outer air outlet end 213 faces radially outward, the interaction of the air flows discharged from adjacent outer air outlet ends 213 is avoided, which is beneficial to noise reduction.

[0042] In this embodiment, a curved extension portion 212 is provided between the inner air inlet end 211 and the outer air outlet end 213 of the radial air outlet duct 200. The curved extension portion 212 extends in a curve and forms a turning portion at the connection positions with the inner air inlet end 211 and the outer air outlet end 213. While changing the air flow direction through the turning portion, the air flow noise is reduced. The design of the curved extension portion 212 prolongs the length of the air outlet duct 200, which can reduce the air flow speed. At the same time, the curve design is beneficial to slowing down the impact of the air flow on the air outlet duct 200, thereby reducing noise. The air flow flows along the air outlet duct 200 and changes its direction when passing through the turning portion. Compared with the straight flow, the sound waves generated by the air flow with multiple turns cannot propagate along a single direction, so the amplitude of the sound waves decreases, the whistling sound is effectively suppressed, and the sound propagation efficiency is reduced. As a result, the noise generated during the air flow process is reduced. Through reasonable structural design, not only can the air flow speed be reduced, but also the impact force generated during the air flow can be reduced. The impact between the air flow discharged from the vacuum cleaner to the outside and the outside air is weak, thereby reducing the noise transmitted from the vacuum cleaner to the outside and improving the user experience.

[0043] It can be understood that the above-mentioned turning portion refers to the portion on the radial air outlet duct 200 that can change the air flow direction, which can be a turning of an arc structure, a vertical turning, or a turning with a certain included angle, and the specific structure is not limited.

[0044] It can be understood that to ensure that the air flow makes multiple turns in the radial air outlet duct 200, at least two turning portions need to be provided, such as two, three, four, etc.

[0045] To better limit the air flow space, a motor air outlet cover 3 is provided at the rear side of the motor cover. A radial air outlet duct 200 is formed between the rear end of the motor cover and the motor air outlet cover 3. The setting of the motor air outlet cover 3 provides a separated air flow space for the air flow, thereby more effectively guiding the air flow discharged from the air outlet 22 and making the air flow flow more orderly, reducing the generation of noise.

[0046] Specifically, such as Figure 3 、 Figure 7 and Figure 8As shown, a front end cover 23 of the air duct is provided at the rear end of the motor cover, and a rear end cover 31 of the air duct is provided on the motor air outlet cover 3. A front air duct rib 231 protruding backward is provided on the front end cover 23 of the air duct. After the motor air outlet cover 3 and the rear motor cover 2 are assembled together, four radial air outlet ducts 200 are formed between the front end cover 23 of the air duct and the rear end cover 31 of the air duct. The four radial air outlet ducts 200 are composed of an inner air inlet end 211, a curve extension part 212, an outer air outlet end 213, the front air duct rib 231 and the motor air outlet cover 3. Among them, the outer air duct and the inner air duct share the front air duct rib 231 to form the air outlet end of the air outlet duct 200. Such a design simplifies the structure of the front end cover 23 of the air duct and the occupied space of the front air duct rib 231, while ensuring the stability and effectiveness of the air outlet duct 200.

[0047] The radial air outlet duct 200 formed by the combination of the front end cover 23 of the air duct provided on the rear motor cover 2 and the rear end cover 31 of the air duct provided on the motor air outlet cover 3 can effectively guide the air flow to flow orderly. Among them, the front air duct rib 231 is designed to protrude axially, forming a relatively long air duct within a limited radial space, which helps to more effectively reduce the air flow speed and reduce noise.

[0048] In this embodiment, the motor cover includes a front motor cover 1 and a rear motor cover 2. To ensure the airtightness between the rear motor cover 2 and the front motor cover 1, a first sealing ring 7 is provided between the rear motor cover 2 and the front motor cover 1, and a second sealing ring 8 is provided at the front end of the front motor cover 1. Through the reasonable design and layout of the first sealing ring 7 and the second sealing ring 8, the airtightness of the vacuum cleaner can be greatly improved, the noise caused by air flow and vibration can be reduced, and a quieter use environment can be provided for users. A first screw mounting groove 16 and a clamping groove 17 are provided on the front motor cover 1. A clamping rib 26 adapted to the clamping groove 17 is provided on the rear motor cover 2, and a second screw mounting groove 33 is provided on the motor air outlet cover 3. The clamping rib 26 is placed in the clamping groove 17, thereby realizing the clamping and fixing of the rear motor cover 2 and the front motor cover 1. Subsequently, the first screw mounting groove 16 and the second screw mounting groove 33 are fixed using a screw 18, thereby realizing the fastening connection between the front motor cover 1 and the motor air outlet cover 3. To ensure the effective fixed connection between the front motor cover 1, the rear motor cover 2 and the motor air outlet cover 3, four first screw mounting grooves 16, four second screw mounting grooves 33, two clamping grooves 17 and two clamping ribs 26 are provided, and four screws 18 are used to fix the first screw mounting groove 16 and the second screw mounting groove 33.

[0049] It can be understood that in other embodiments, a rear air duct cover 31 may also be provided with a rear air duct rib having the same function as the front air duct rib 231 of the air duct. The front air duct cover 23, the rear air duct cover 31, and the front air duct rib 231 and the rear air duct rib enclose a defined space, or only the front air duct cover 23, the rear air duct cover 31, and the rear air duct rib enclose the radial air outlet duct 200 of the air outlet duct 200, which can also achieve the effect of reducing noise.

[0050] Specifically, as Figure 10 shown, the air outlet 22 protrudes upward from the front air duct cover 23. The motor air outlet cover 3 is provided with an air outlet cylinder 32 covering the outside of the air outlet 22. The rear air duct cover 31 is provided with a protruding portion 311 on the radial outside of the air outlet cylinder 32. The protruding portion 311 is divided into two parts, with the inner side 3111 being higher and the outer side 3112 being lower. The designed protruding portion 311 can communicate with two adjacent air outlet ducts 200 respectively. Among them, the inner side 3111 communicates with the inner ring air duct, and the outer side 3112 communicates with the outer ring air duct, so as to guide the air flow to pass more evenly. The inside of the protruding portion 311 is connected to the inside of the air outlet cylinder 32 and the inner end of the radial air outlet duct 200, guiding the air flow to make multiple turns in the air duct. Such a structural design effectively reduces noise, limits the path of noise propagation, and improves the noise reduction effect.

[0051] In this embodiment, the widths of the inner air inlet end 211 and the outer air outlet end 213 are both greater than the width of the curved extension portion 212. Therefore, the cross-sectional areas of the inner air inlet end 211 and the outer air outlet end 213 are both greater than the area of the curved extension portion 212. Of course, the lengths of the inner air inlet end 211 and the outer air outlet end 213 can be both less than the length of the curved extension portion 212. The length of the curved extension portion 212 is the longest, extending the length of the air outlet duct 200. At the same time, a turning portion is formed between the inner air inlet end 211 and the outer air outlet end 213. The larger width is beneficial to avoid the impact of the turning portion and reduce noise. Especially when the width of the outer air outlet end 213 is increased again, the air flow velocity can be reduced, the impact can be reduced, and the noise can be reduced. The wider inner air inlet end 211 and outer air outlet end 213 provide a larger flow space for the air flow, reducing the possibility of air flow obstruction, and enabling the sound wave to disperse in different directions instead of propagating in one direction, thereby reducing the aggregation of sound and reducing the generation of noise. Of course, the lengths of the inner air inlet end 211 and the outer air outlet end 213 can also be greater than the length of the curved extension portion 212, that is, the specific structures of the inner air inlet end 211, the air outlet end, and the curved extension portion 212 can be designed according to needs.

[0052] It can be understood that the curve shape of the curve extension part 212 is not limited, and at least one turning part can also be formed in the curve extension part 212 through curve design. In this embodiment, the curve extension part 212 extends in an arc shape. The arc-shaped curve extension part 212 provides a longer flow path for the air flow. The longer movement path can slow down the flow velocity of the air flow, and is also more conducive to dispersing the sound source, making the sound waves more evenly distributed in space, thereby reducing the frequency of the sound and reducing the generation of noise.

[0053] It can be understood that in other embodiments, in order to better extend the flow path of the air flow, the curve extension part 212 extends in a spiral shape. In addition, the curve extension part 212 can also be designed into other structural forms to extend the length of the air outlet duct 200.

[0054] In this embodiment, a rear positioning step 13 is provided on the inner circle of the rear end of the motor cover. An electric motor shock-absorbing ring 4 is provided between the outer circle of the rear end of the electric motor body 6 and the rear positioning step 13. The existence of the rear positioning step 13 provides a mechanical isolation point on the inner circle of the rear end of the front motor cover 1 to prevent vibration from being directly transmitted to other components or the housing. The electric motor shock-absorbing ring 4 further provides buffering on the outer circle of the rear end of the electric motor body 6, effectively reducing the possibility of vibration transmission through the structure; the electric motor shock-absorbing ring 4 is usually made of a flexible material, and the flexible material can absorb and reduce the transmission of electric motor vibration, reducing the noise caused by mechanical vibration. In this embodiment, the electric motor shock-absorbing ring 4 is made of silicone material.

[0055] Specifically, a groove 41 is provided on the inner circle of the electric motor shock-absorbing ring 4, and the outer circle of the rear end of the electric motor body 6 is engaged in the groove 41. The groove 41 of the electric motor shock-absorbing ring 4 provides an additional support point for the electric motor body 6, enhancing the shock-absorbing effect. This additional support point helps to damp and disperse the vibration, thereby effectively reducing the possibility of vibration transmission to other components and reducing the noise level.

[0056] In this embodiment, an electric motor shock-absorbing member 5 is provided between the front end of the electric motor body 6 and the inner wall of the front end of the motor cover. The electric motor shock-absorbing member 5 acts as a buffer between the front end of the electric motor body 6 and the inner wall of the front end of the motor, and can effectively isolate the mechanical vibration generated by the electric motor, reducing the possibility of electric motor vibration being transmitted to other parts of the vacuum cleaner through the structure, thereby reducing the noise generated by irregular vibration.

[0057] Specifically, the motor shock absorber 5 is a shock-absorbing ring. An anterior positioning step 11 for positioning the front end face of the motor body 6 is provided on the inner side of the front end of the motor cover. The shock-absorbing ring is sequentially provided with a radially extending portion 51 and an axially extending portion 52 in the front-back direction. The radially extending portion 51 is disposed between the front end face of the motor body 6 and the anterior positioning step 11. The axially extending portion 52 is disposed between the outer circumference of the front end of the motor body 6 and the inner wall of the front motor cover 1. The presence of the anterior positioning step 11 helps to ensure the correct position of the shock-absorbing ring, enhance the vibration isolation effect, and reduce the possibility of vibration being transmitted to the front motor cover 1; the shock-absorbing ring can provide a larger contact area to absorb and isolate mechanical vibrations. Among them, the radially extending portion 51 of the shock-absorbing ring is arranged between the front end face of the motor body 6 and the anterior positioning step 11, and the axially extending portion 52 of the shock-absorbing ring is arranged between the outer circumference of the front end of the motor body 6 and the inner wall of the front motor cover 1, which can prevent mechanical vibrations from being transmitted to other components through the structure in multiple directions, improving the noise reduction effect. In addition, the combined design of the shock-absorbing ring and the motor shock-absorbing ring 4 can more effectively isolate the vibrations of the motor body 6 and the fan, reduce the occurrence of mechanical vibrations being conducted from the motor to other components, thereby reducing the possibility of generating structural noise. Combined with the design of the air outlet duct 200, the noise of the vacuum cleaner can be significantly reduced.

[0058] Specifically, the front end of the motor body 6 is sequentially provided with a first step portion 61 and a second step portion 62 in the front-back direction, and the diameter of the second step portion 62 is larger than that of the first step portion 61. The axially extending portion 52 is sequentially provided with a small-diameter section 521 and a large-diameter section 522 in the front-back direction. The small-diameter section 521 cooperates with the first step portion 61, and the large-diameter section 522 cooperates with the second step portion 62. Through the settings of the first step portion 61 and the second step portion 62, and the cooperation of the small-diameter section 521 and the large-diameter section 522, multi-stage shock absorption is achieved, thereby enabling more comprehensive vibration control within different frequency and amplitude ranges and reducing noises of various frequencies.

[0059] Specifically, a radially protruding rib 5221 for cooperating with the inner wall of the front motor cover 1 is provided on the outer circumference of the large-diameter section 522. The radially protruding rib 5221 can improve the structural stability between the front motor cover 1 and the motor body 6, thereby helping to reduce the possibility of vibration being transmitted to other parts of the vacuum cleaner, thus reducing the generation of noise.

[0060] In this embodiment, the motor rear cover 2 is provided with a flared structure for guiding the airflow to concentrate towards the air outlet 22 on the front side of the air outlet 22. By reasonably designing the geometric shape of the flared opening, the diffusion angle of the airflow and sound waves can be adjusted, which helps to focus the generated airflow in one direction and reduce the possibility of the airflow and the sound waves generated during the airflow movement spreading in other directions, thereby reducing the generation of noise.

[0061] Specifically, a stepped end face 14 is provided on the outer circle at the rear end of the front motor cover 1, and a positioning ring groove 15 is provided on the stepped end face 14. A flange portion 24 is provided at the front end of the rear motor cover 2. The flange portion 24 is inserted into the positioning ring groove 15. A sealing groove 241 is provided on the outer circle of the flange portion 24. The first sealing ring 7 is arranged in the sealing groove 241 and is in sealing cooperation with the inner wall of the outer circle of the positioning ring groove 15. The combination of the positioning ring groove 15 and the flange portion 24 provides effective sealing at the joint of the front motor cover 1 and the rear motor cover 2. The sealing groove 241 and the first sealing ring 7 can further ensure the sealing performance of the joint, prevent air leakage, and reduce the noise caused by air flow.

[0062] To better improve the sound insulation effect of the vacuum cleaner, a sound-absorbing member 9 is provided at the front end of the front motor cover 1. Airflow enters from the air inlet 12 and flows into the motor air duct 100 after passing through the sound-absorbing member 9. In this embodiment, the sound-absorbing member 9 is sound-absorbing sponge, and its shape is adapted to the shape of the air inlet 12. The sound-absorbing member 9 is usually designed to absorb and attenuate noise in a specific frequency range. Thus, by being arranged at the front end of the air inlet 12, the sound-absorbing member 9 plays a certain buffering role before the airflow enters the motor air duct 100, thereby effectively absorbing and slowing down the high-frequency noise in the airflow and providing a better user experience for users.

[0063] In this embodiment, the motor body 6 is connected with a cable 63. The cable 63 passes through the air outlet 22 and the radial air outlet duct 200. A wiring groove 25 is provided in the radial air outlet duct 200. The cable 63 is routed along the wiring groove 25. By providing the wiring groove 25 in the radial air outlet duct 200, the cable 63 can be directly routed in the wiring groove 25, avoiding the need to set up additional wiring structures or brackets, simplifying the structure of the vacuum cleaner and the wiring process. And as Figure 3 and Figure 6 shown, a wire clamping structure 34 is provided on the motor air outlet cover 3 to clamp the cable 63, preventing the cable 63 from loosening or moving randomly during the operation of the vacuum cleaner and avoiding problems caused by the collision or vibration of the cable 63.

[0064] It can be understood that the above vacuum cleaner can be a handheld vacuum cleaner or other types of vacuum cleaners. For other structures of the vacuum cleaner, reference can be made to the existing technology and will not be elaborated here one by one.

[0065] In addition to the above preferred embodiments, the present invention has other implementation manners. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection claimed by the present invention.

Claims

1. A noise-reducing vacuum cleaner, comprising a motor body, a fan, and a motor cover. The motor body drives the fan to rotate around a rotating shaft. The motor cover covers the outside of the motor body and the fan. The front end of the motor cover is provided with an air inlet, and the rear end is provided with an air outlet. An air duct for the motor is provided between the air inlet and the air outlet. The air flow entering from the air inlet flows along the air duct for the motor and is discharged from the air outlet. It is characterized in that, At least two radial air outlet ducts are circumferentially distributed along the rear side of the motor cover around the air outlet. The radial air outlet ducts extend from the inside to the outside in the radial plane of the motor cover, and the outer air outlet ends face radially outward. The inner air inlet ends and the outer air outlet ends of the radial air outlet ducts are at different radial positions to extend the length of the radial air outlet ducts. The air flow discharged from the air outlet flows along the radial air outlet ducts and gradually reduces the air flow noise.

2. The vacuum cleaner according to claim 1, wherein, A curved extension part is arranged between the inner air inlet end and the outer air outlet end of the radial air outlet duct. The curved extension part extends in a curve and forms a turning part at the connection positions with the inner air inlet end and the outer air outlet end. While changing the air flow direction through the turning part, the air flow noise is reduced.

3. The vacuum cleaner according to claim 2, characterized in that, A motor air outlet cover is arranged at the rear side of the motor cover. A radial air outlet duct is formed between the rear end of the motor cover and the motor air outlet cover.

4. The vacuum cleaner according to claim 3, wherein A duct front end cover is arranged at the rear end of the motor cover, and a duct rear end cover is arranged on the motor air outlet cover; a duct front retaining rib protruding backward is arranged on the duct front end cover, and / or a duct rear retaining rib is arranged on the duct rear end cover; the duct front end cover, the duct rear end cover, and the duct front retaining rib and / or the duct rear retaining rib enclose to form a radial air outlet duct.

5. The vacuum cleaner according to claim 4, characterized in that, The air outlet protrudes upward from the duct front end cover. The motor air outlet cover is provided with an air outlet cylinder covering the outside of the air outlet. A protruding part is arranged on the radial outside of the air outlet cylinder on the duct rear end cover. The inside of the protruding part is communicated with the inside of the air outlet cylinder and the inner end of the radial air outlet duct.

6. The vacuum cleaner according to claim 1, wherein A rear positioning step is arranged on the inner circle of the rear end of the motor cover. A motor shock-absorbing ring is arranged between the outer circle of the rear end of the motor body and the rear positioning step.

7. The vacuum cleaner according to claim 1, characterized in that, A motor shock-absorbing member is arranged between the front end of the motor body and the inner wall of the front end of the motor cover.

8. The vacuum cleaner according to claim 7, characterized in that, The motor shock-absorbing member is a shock-absorbing ring. A front positioning step for positioning the outer circle end face of the front end of the motor body is arranged on the inner side of the front end of the motor cover. The shock-absorbing ring is sequentially provided with a radial extension part and an axial extension part in the front-rear direction. The radial extension part is arranged between the outer circle end face of the front end of the motor body and the front positioning step, and the axial extension part is arranged between the outer circle of the outer circle of the front end of the motor body and the inner wall of the front motor cover.

9. The vacuum cleaner according to claim 1, characterized in that, The motor cover is provided with a flared structure for guiding the air flow to concentrate on the air outlet at the front side of the air outlet; and / or, the motor cover includes a front motor cover and a rear motor cover, and a first sealing ring is arranged between the rear motor cover and the front motor cover.

10. The vacuum cleaner according to claim 1, characterized in that, The motor body is connected with a cable. The cable passes through the air outlet and the radial air outlet duct. A wiring groove is arranged in the radial air outlet duct, and the cable is routed along the wiring groove.

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