Quiet vacuum cleaner

Abstract

A quiet vacuum cleaner, comprising an air exhaust assembly (1) and an upper cover (14), wherein the air exhaust assembly (1) is arranged inside the upper cover (14), and comprises a first air duct (2) and a second air duct (3), the first air duct (2) being annular; the first air duct (2) and the second air duct (3) are arranged in layers, and the second air duct (3) is arranged above the first air duct (2); one end of the second air duct (3) is arranged at a spiral center (4) of the first air duct (2), and the other end thereof radially extends to an outer ring of the first air duct (2); and the first air duct (2) is in communication with the second air duct (3).

Description

A mute dust collector TECHNICAL FIELD

[0001] The present application relates to a dust collector, more particularly, it relates to a mute dust collector. BACKGROUND

[0002] Common household dust collectors, usually household dust collectors are small particles by vacuum, that is, negative pressure into the dust bag or dust cup, is driven by the fan vortex fan, high speed, noise is also larger. Users need to avoid the impact of noise when using the dust collector to suck garbage in daily work, and the existing dust collector usually sets some noise reduction articles such as thick sponge, but the suction force will be weakened.

[0003] For example: Chinese patent No. CN2173100094U, announcement date August 30, 2022, the name of a kind of dust collector air outlet noise reduction device, the application discloses a noise reduction dust collector, including dust collector body and soundproof board, the left side of the dust collector body is fixedly installed with dust collection head, the inner wall right side of the dust collector body is provided with air outlet, the upper and lower sides of air outlet are provided with mounting plate, the soundproof board is located in the dust collector body inside and between two mounting plates. The dust collector air outlet noise reduction device is compressed by relatively pressing the left and right two push rods, the push rod drives the rotating rod to rotate through the fixed plate, the rotating rod drives the two clamping blocks to move away from each other, so that the clamping blocks and the fixed groove are disengaged, the two fixed rods move away from each other, and the fixed rods and the clamping grooves in the soundproof board are disengaged, so that the soundproof board can be disassembled conveniently;But the structure of this scheme is complex, and the noise reduction effect is not good. SUMMARY

[0004] The present application overcomes the problem that the existing dust collector is easy to produce noise, and provides a mute dust collector, which can greatly reduce the noise generated during the working process of the dust collector and improve the user experience.

[0005] In order to solve the above technical problems, the present application adopts the following technical scheme: a mute dust collector, comprising an air exhaust assembly and an upper cover, the air exhaust assembly is arranged in the upper cover, the air exhaust assembly comprises a first air duct and a second air duct, the first air duct is annular, the first air duct and the second air duct are arranged in layers, and the first air duct and the second air duct are communicated. In this scheme, the first air duct is arranged in an annular structure, which can effectively increase the suction air flow path in the dust collector, consume the energy inside the air flow by prolonging the air flow path, so as to reduce the noise generated by the air flow in the dust collector, and the second air duct can be used in series or parallel with the first air duct to realize different effects, increase the diversity and functionality of the air duct.

[0006] As preferred, the first air duct is a spiral ring, the size of the first air duct gradually increases from the air inlet end to the air outlet end, the air outlet end of the first air duct is provided with a bending portion, and the air outlet end of the first air duct is formed with a flared portion along the spiral direction thereof from the bending portion; the second air duct is arranged on the first air duct, one end of the second air duct is arranged at the spiral center of the first air duct, and the other end extends radially to the outer circle of the first air duct. The first air duct is a centrifugal air duct for dust suction of the dust collector, and the second air duct is a cooling air duct inside the dust collector. The spiral shape of the first air duct can increase the movement path of the centrifugal air, and the gradually increasing size of the first air duct along the air outlet direction can gradually reduce the wind speed of the centrifugal air, reduce the kinetic energy of the centrifugal air, and achieve the effect of buffering and noise reduction. The first air duct and the second air duct are arranged together, which can reduce the overall volume of the exhaust assembly and make the structure of the exhaust assembly more compact. The bending portion of the air outlet end of the first air duct enables the first air duct to expand along the circumferential direction, thereby further increasing the air outlet space at the outlet of the first air duct, further reducing the wind speed of the centrifugal air, and reducing the noise of the dust collector. The flared portion is located in the spiral direction of the first air duct, which can reduce the circumferential size of the exhaust assembly as much as possible.

[0007] As preferred, the vertical height ratio of the air outlet end to the air inlet end of the first air duct is in the range of (1, 2], and the width ratio of the air outlet end to the air inlet end of the first air duct is in the range of [1, 1.5]. Along the air outlet direction of the first air duct, the height gradually increases, thereby realizing the gradual increase of the size of the first air duct in the height direction and improving the vent hole diameter of the first air duct. At the same time, along the air outlet direction of the first air duct, the width can also gradually increase, thereby realizing the size increase of the first air duct in the width direction and improving the vent hole diameter of the first air duct. The height ratio of the height of the air outlet end to the height of the air inlet end of the first air duct is preferably selected in the range of 1.5 to 1.6. The size increase of the vent hole of the first air duct is preferably in the form of height increase, and the width can remain unchanged. That is, the size of the first air duct in the height direction gradually increases, and the size of the first air duct in the width direction can gradually increase or remain unchanged.

[0008] As preferred, the first air duct is further provided with a flat portion, and the included angle between the two ends of the flat portion and the spiral center is in the range of 30° to 60°. The flat portion on the first air duct can reduce the overall volume of the exhaust assembly to a certain extent, and on the basis of ensuring the length of the centrifugal air ventilation path, the size of the exhaust structure of the dust collector is reduced as much as possible. The length of the flat portion also needs to be limited, specifically, the included angle between the two ends of the flat portion and the spiral center is in the range of 30° to 60°, so that the length of the flat portion is neither too long to affect the noise reduction function nor too short to cause the size of the exhaust assembly to be large.

[0009] As preferred, the flared portion is provided with a first baffle plate, the flared portion is provided with a second baffle plate which is bent, one end of the second baffle plate is arranged above the first baffle plate, the other end of the second baffle plate is located at the flared portion to form a sound attenuation cavity, the first baffle plate is provided with a first sound attenuation hole, and the second baffle plate is provided with a second sound attenuation hole. The bent part of the first baffle plate and the second baffle plate is spaced to form a cavity, and the bent part of the other side of the second baffle plate is arranged at the flared portion to form a sound attenuation cavity structure, which can greatly reduce the noise of the airflow. The sound attenuation holes are arranged at the positions of the first baffle plate and the second baffle plate at the flared portion for the airflow out of the flared portion; wherein the first sound attenuation hole on the first baffle plate increases the exhaust space and reduces the exhaust flow rate.

[0010] As preferred, the first air duct and the sound attenuation cavity are provided with sound attenuation materials. Since the sound attenuation hole has a small diameter, the centrifugal wind is prone to generate turbulence in the sound attenuation cavity; therefore, the first air duct and the sound attenuation cavity are provided with sound attenuation materials on the inner walls thereof, so that the centrifugal wind is absorbed in the first air duct when moving, and is further absorbed at the outlet of the first air duct, thereby finally reducing the noise of the dust collector.

[0011] As preferred, it further comprises a filter support and an intermediate layer, the first air duct is arranged in the filter support, the first air duct is further provided with a bifurcated flow channel, the intermediate layer is buckled above the first air duct, the upper part of the intermediate layer is provided with a second air duct, and the bifurcated flow channel converges into the second air duct. The filter support can be used to install the filter, and can also be internally provided with a first air duct structure for conveying the filtered airflow. Since the first air duct is annular, the bifurcated flow channel is also annular, thereby providing a larger air guide diameter to slow down the airflow rate, and effectively utilizing the excess space inside the dust collector. The first air duct and the second air duct are directly connected, further lengthening the length of the air duct, thereby further increasing the flow path of the airflow to effectively reduce the noise of the dust collector.

[0012] As preferred, the spiral center is provided with a driving device, and the driving device is provided with a cooling device. The spiral center of the first air duct is an empty part, so it can provide installation space for the driving device, and the driving device can also guide the suction airflow into the first air duct; the cooling device can provide cooling effect for the driving device to prevent overheating of the driving device. The driving device can be an electric motor, and the cooling device can be a cooling fan.

[0013] As preferred, the upper part of the intermediate layer is provided with a base, the base is provided with a winding device, the winding device comprises a tray and a rotating disc, and a containing space is arranged between the tray and the rotating disc. The winding device can accommodate the power cord of the vacuum cleaner, the tray is used for supporting the entire winding device and supporting the wound power cord, and the rotating disc can drive the winding device to rotate to perform the winding and unwinding operation, thereby improving the convenience of power cord accommodation; and the containing space is used for accommodating the wound reel.

[0014] As preferred, the bottom cover is further provided, the exhaust assembly is fixed to the bottom cover, the upper cover is buckled on the exhaust assembly, and the upper cover is respectively provided with a first air window and a second air window corresponding to the first air duct and the second air duct. The upper cover is buckled on the exhaust assembly, and the bottom cover is buckled on the exhaust assembly to fix and limit the exhaust assembly. The upper cover can also protect the exhaust assembly, and the bottom cover can support and fix the exhaust assembly. The first air window and the second air window are arranged on the upper cover and are used for exhausting air from the first air duct and the second air duct respectively.

[0015] As preferred, the bottom cover is further provided, the exhaust assembly is fixed to the bottom cover, the upper cover is buckled on the exhaust assembly, and the upper cover is respectively provided with a first air window and a second air window corresponding to the first air duct and the second air duct. The upper cover is buckled on the exhaust assembly, and the bottom cover is buckled on the exhaust assembly to fix and limit the exhaust assembly. The upper cover can also protect the exhaust assembly, and the bottom cover can support and fix the exhaust assembly. The first air window and the second air window are arranged on the upper cover and are used for exhausting air from the first air duct and the second air duct respectively.

[0016] As preferred, the upper and lower parts of the driving device are provided with shock-absorbing rings. The shock-absorbing rings can buffer the driving device to prevent the driving device from generating noise due to large vibration during the dust collection work, and also protect the driving device from damage due to large vibration.

[0017] As preferred, the upper cover is further provided with a wire outlet, and the wire outlet is provided with a roller. The wire outlet on the upper cover can pass through the power cord of the vacuum cleaner, and the roller can guide the power cord. When the power cord is pulled out of the wire outlet or put into the wire outlet, the roller will rotate to ensure the winding and unwinding function of the power cord.

[0018] As preferred, the height of the first air duct is less than the height of the second air duct, and the second air duct passes through the outside of the first air duct. The driving device is arranged at the center of the spiral, and the second air duct is fixed to one end of the center of the spiral and covers the center of the spiral. The upper and lower parts of the driving device are provided with shock-absorbing rings, and the driving device is further provided with a cooling device.

[0019] Preferably, the inner side wall of the first air duct is extended along a spiral direction relative to the outer side wall at the air outlet end of the first air duct, and the inner and outer side walls at the air outlet end of the first air duct are at different spiral radial positions and are bent outward along the spiral radial direction.

[0020] Preferably, the first air duct and the sound attenuation cavity are both provided with sound attenuation materials.

[0021] Preferably, the filter is arranged on the filter support provided on the barrel opening of the dust collecting barrel. The filter support comprises a fixing plate adapted to the barrel opening of the dust collecting barrel and the upper cover, and an air inlet cylinder located at the middle part of the fixing plate and having an air inlet hole at the bottom thereof facing the dust collecting barrel.

[0022] Preferably, a first air duct in the shape of a ring is arranged between the air inlet cylinder and the fixing plate, and an air duct partition plate is arranged between the air inlet cylinder and the fixing plate, and the air duct partition plate, the air inlet cylinder and the fixing plate are arranged in the shape of concentric rings. The first air duct comprises a first bifurcated flow channel between the air inlet cylinder and the air duct partition plate, and a second bifurcated flow channel between the air duct partition plate and the fixing plate, and the first bifurcated flow channel and the second bifurcated flow channel are in communication.

[0023] Preferably, a cylinder partition plate is arranged at the top side of the air inlet cylinder, the cylinder partition plate is separated from the air inlet cylinder, and an air outlet is arranged on the cylinder partition plate.

[0024] Compared with the prior art, the dust collector has the following advantages: (1) the spiral air duct can greatly reduce the noise of the dust collector; (2) the straight section arranged in the spiral air duct reduces the outward rotation of the spiral air duct and reduces the radial dimension of the air duct; (3) the cooling device and the cooling air duct prevent the motor inside the dust collector from overheating and increase the service life; (4) the shock absorption structure can also reduce the noise of the dust collector to a certain extent; and (5) the wire winding device can store the wire structure and prevent the wire from winding. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is an axonometric view of the upper cover of the dust collector in an undocked state.

[0026] Fig. 2 is a schematic view of the air exhaust assembly and the dust collecting barrel.

[0027] Fig. 3 is an axonometric view of the air exhaust assembly.

[0028] Fig. 4 is a side view of the air exhaust assembly.

[0029] Fig. 5 is an axonometric view of the air exhaust assembly from another perspective.

[0030] Fig. 6 is a bottom view of the air exhaust assembly.

[0031] Fig. 7 is an axonometric view of the present application.

[0032] Fig. 8 is a schematic view of the exhaust assembly and the bottom cover of the present application.

[0033] Fig. 9 is a schematic view of embodiment 2 of the present application.

[0034] Fig. 10 is a schematic view of the exhaust assembly structure of embodiment 2 of the present application.

[0035] Fig. 11 is a top view of the exhaust assembly of embodiment 2 of the present application.

[0036] Fig. 12 is a schematic view of the exhaust assembly of embodiment 2 of the present application.

[0037] Fig. 13 is a schematic view of the exhaust assembly of embodiment 2 of the present application.

[0038] Fig. 14 is a schematic view of embodiment 3 of the present application.

[0039] Fig. 15 is a partial exploded schematic view of embodiment 3 of the present application.

[0040] Fig. 16 is a schematic view of the exhaust assembly structure of embodiment 3 of the present application.

[0041] Fig. 17 is a sectional view of embodiment 3 of the present application.

[0042] Fig. 18 is a schematic view of the upper cover and the filter holder of embodiment 3 of the present application.

[0043] Fig. 1. Exhaust assembly, 2. First air duct, 21. Inner spiral, 22. Outer spiral, 3. Second air duct, 31. Side plate, 4. Spiral center, 5. Bending part, 6. Flared part, 7. Straight part, 8. First partition, 9. Second partition, 10. Sound attenuation cavity, 11. First sound attenuation hole, 12. Second sound attenuation hole, 13. Driving device, 14. Upper cover, 15. Bottom cover, 16. First air window, 17. Second air window, 18. Dust collecting bucket, 19. Filter, 20. Shock absorbing ring, 23. Connecting rib, 24. Handle, 25. Universal wheel, 26. Filter holder, 261. Fixed plate, 262. Air inlet cylinder, 271. First bifurcated flow channel, 272. Second bifurcated flow channel, 28. Intermediate layer, 29. Tray, 30. Turntable, 32. Containing space, 33. Outlet, 34. Roller, 35. Air inlet hole, 36. Duct partition, 37. Cylinder partition, 38. Air outlet, 39. Air guide partition, 40. Layer plate, 41. Operating part. DETAILED DESCRIPTION

[0044] The technical solutions of the present application will be further described in detail below with specific embodiments and in conjunction with the drawings.

[0045] Embodiment 1: A silent dust collector as shown in Figs. 1-8, comprising an air exhaust assembly 1, an upper cover 14 and a dust collecting barrel 18, a bottom cover 15 is arranged at the barrel opening of the dust collecting barrel 18, the bottom cover 15 cooperates with the barrel opening of the dust collecting barrel 18, the air exhaust assembly 1 is fixedly arranged on the bottom cover 15, the upper cover 14 is arranged at the upper portion of the air exhaust assembly 1 and can cooperate with the bottom cover 15, and the air exhaust assembly 1 is fixed between the upper cover 14 and the bottom cover 15. The air exhaust assembly 1 is a structure of an air exhaust cover, the air exhaust assembly 1 comprises a first spiral air duct 2 and a second straight air duct 3, a driving device 13 is arranged at the spiral center 4 of the first air duct 2, which is used to generate the suction airflow of the dust collector, the driving device 13 is fixed on the bottom cover 15 and located in the spiral center 4 of the first air duct 2, and a cooling fan is arranged on the driving device 13, which is used to cool the driving device 13.

[0046] The first air duct 2 and the second air duct 3 are both rectangular openings, one end of the second air duct 3 is arranged at the spiral center 4 of the first air duct 2, and the other end of the second air duct 3 passes through the first air duct 2 from above, that is, the second air duct 3 is arranged at the upper portion of the shell of the first air duct 3 and extends linearly from the spiral center 4 to the outer circle of the first air duct 2, and the first air duct 2 and the second air duct 3 at this position are not connected, specifically, a clamping groove structure is arranged on the two side plates 31 of the second air duct 3, which is matched with the outer contour of the first air duct 2, so that after the clamping grooves of the two side plates 31 cooperate with the outer contour of the first air duct 2, the second air duct 3 can pass through the first air duct 2 radially. It should be noted that in order to prevent the first air duct 2 from hindering the ventilation of the second air duct 3, the height of the first air duct 2 is less than the height of the second air duct 3, that is, there is a certain opening inside the second air duct 3 for ventilation. Arranging the second air duct 3 outside the first air duct 2 and crossing the first air duct 2 and the second air duct 3 can greatly reduce the size of the air exhaust assembly 1, make the air duct arrangement compact, and simplify the layout of the air duct. In this scheme, passing the second air duct 3 from the outside of the first air duct 2 instead of from the inside of the first air duct 2 can ensure that there is enough ventilation space inside the first air duct 2, and the second air duct 3 is used for cooling exhaust air and will not produce a large and rapid airflow, so the second air duct 3 does not need a large ventilation space, and the design of this scheme is more reasonable.

[0047] The second air duct 3 is fixed with the driving device 13 at one end of the spiral center 4 and covers the spiral center 4. The bottom cover 15 is provided with a through hole at the spiral center 4 of the first air duct 2, so that the exhaust assembly 1 and the inside of the dust collecting barrel 18 are communicated. The suction air flow in the dust collecting barrel 18 is introduced into the first air duct 2 and forms centrifugal wind in the spiral structure of the first air duct 2. The spiral first air duct 2 increases the flow path of the suction air flow, which is conducive to the absorption of air flow noise by the sound-absorbing material in the first air duct 2. Three fixed screw holes are arranged on the side wall of the second air duct 3 for fixed connection with the driving device 13. In the embodiment, the driving device 13 is an electric motor.

[0048] The first air window 16 and the second air window 17 are further arranged on the upper cover 14. The first air window 16 is located at the air outlet end of the first air duct 2, and the second air window 17 is located at the air outlet end of the second air duct 3. The air flow in the first air duct 2 is discharged to the outside of the dust collector through the first air window 16 of the upper cover 14 after flowing out of the air outlet end thereof, and the cooling air of the second air duct 3 is discharged to the outside of the dust collector through the second air window 17 of the upper cover 14 after flowing out of the air outlet end thereof. The first air window 16 and the second air window 17 are both a plurality of vertically arranged grid hole structures.

[0049] The first air duct 2 is a spiral rising structure. The ratio of the vertical height dimension of the air outlet end of the first air duct 2 to the vertical height dimension of the air inlet end of the first air duct 2 is 1.5. The air inlet end of the first air duct 2 is located at the spiral center position of the first air duct 2, and the air outlet end of the first air duct 2 is located at the outer diameter of the spiral of the first air duct 2. The height of the first air duct 2 gradually increases in the flow direction thereof, which can increase the hole diameter of the first air duct 2. When the air flow flows in the first air duct 2, the pressure of the air flow gradually decreases as the hole diameter of the first air duct 2 gradually increases, that is, the flow rate of the air flow becomes relatively slow, so that the noise generated when the air flow flows in the first air duct 2 can be effectively reduced. Similarly, the width dimension of the first air duct 2 in the width direction thereof can also be changed. Specifically, the ratio of the width of the air outlet end of the first air duct 2 to the width of the air inlet end of the first air duct 2 is 1.2. The width of the first air duct 2 gradually increases in the flow direction thereof, which can also increase the hole diameter of the first air duct 2. By changing the height and width dimensions at the same time, the hole diameter of the first air duct 2 can be increased to a greater extent, so that the effect of speed reduction and noise reduction can be quickly achieved. The vertical height dimension change and the width direction dimension change of the first air duct 2 can be linear and uniform, or can be stepwise.

[0050] It should be noted that the size of the through hole of the first air duct 2 is preferably increased in height, and the width can remain unchanged; that is, the size of the first air duct 2 in the height direction gradually increases, and the size of the first air duct 2 in the width direction can gradually increase or remain unchanged. In this scheme, the ratio of the vertical height dimension of the air outlet end of the first air duct 2 to the vertical height dimension of the air inlet end of the first air duct 2 is in the range of 1 to 2, preferably in the range of 1.5 to 1.6; the ratio of the width of the air outlet end of the first air duct 2 to the width of the air inlet end of the first air duct 2 is in the range of 1 to 1.5; wherein the ratio of the vertical height dimension of the air outlet end of the first air duct 2 to the vertical height dimension of the air inlet end of the first air duct 2 is defined as a, and the ratio of the width of the air outlet end of the first air duct 2 to the width of the air inlet end of the first air duct 2 is defined as b, a and b are not taken as 1 at the same time; when a and b are both taken as 1, the first air duct 2 is a structure with unchanged size, and the effective noise reduction effect cannot be achieved. The cross-sectional area of the air duct in the vertical direction corresponding to the position of the air inlet end of the first air duct 2 to the position of the air outlet end of the first air duct 2 is between 2000mm 2 and 6000mm 2 , and the above parameters will change according to the size of the driving device 13 or the dust collector.

[0051] It should also be noted that the first air duct 2 is spiral, and the spiral first air duct 2 is separated from each other. Specifically, as shown in FIG. 5 or FIG. 6, in this embodiment, the first air duct 2 has a total of two spiral turns, which are respectively referred to as an inner spiral turn 21 and an outer spiral turn 22. The inner spiral turn 21 is lower in height, and the outer spiral turn 22 is higher in height. The inner spiral turn 21 and the outer spiral turn 22 are connected together, wherein the outer side wall of the inner spiral turn 21 serves as the inner side wall of the outer spiral turn 22, so that the inner spiral turn 21 and the outer spiral turn 22 share a side wall structure, and the spiral first air duct 2 is separated by the side wall. Since the bottom of the first air duct 2 needs to be fixed on the bottom cover 15, the bottom of the first air duct 2 is a relatively flat structure and is located on the plane of the bottom cover 15, so that the upper part of the first air duct 2 is a structure with inconsistent heights, and the height of the inner spiral turn 21 of the first air duct 2 is lower than the height of the outer spiral turn 22, thereby forming a vacant spiral center 4. The position of the spiral center 4 is the air inlet end of the second air duct 3, and also provides a mounting space for the driving device 13. Three screw holes are provided on the side wall of the second air duct 3 for fixing the driving device 13. A plurality of connecting ribs 23 are provided between the outer wall of the first air duct 2 and the air inlet end of the second air duct 3, which can make the structure of the first air duct 2 and the second air duct 3 more stable. A fixing hole is also provided on the connecting rib 23, which corresponds to the position of the upper cover 14. A positioning column corresponding to the fixing hole is provided in the inner part of the upper cover 14, so that the upper cover 14 and the air exhaust assembly 1 can be fixed together.

[0052] A bending portion 5 is further arranged at the air outlet end of the first air duct 2, and the air outlet end of the first air duct 2 forms an expanding portion 6 structure. Specifically, the first air duct 2 is bent upward and to the left and right at the bending portion 5, so as to increase the ventilation hole diameter of the first air duct 2. The expanding portion 6 is in the spiral direction of the first air duct 2, the vertical height dimension of the expanding portion 6 is greater than the vertical height dimension of the air outlet end of the first air duct 2 (as shown in FIG. 4), and the width dimension of the expanding portion 6 is much greater than the width dimension of the air outlet end of the first air duct 2 (as shown in FIG. 6). Specifically, at the air outlet end of the first air duct 2, the inner side wall of the first air duct 2 continues to extend along the spiral direction relative to the outer side wall for a certain length, so that the inner and outer side walls of the air outlet end of the first air duct 2 are not at the same spiral radial position, thereby greatly increasing the width dimension of the expanding portion 6. The inner and outer side walls of the air outlet end of the expanding portion 6 are bent outward to a certain extent along the spiral radial direction, which guides the centrifugal wind in the first air duct 2, so that the centrifugal wind can be directed to the first air window 16 on the upper cover 14 when the centrifugal wind flows out of the expanding portion 6. Specifically, when the centrifugal wind reaches the air outlet end of the first air duct 2, part of the airflow will continue to flow along the inner wall of the expanding portion 6, flow to the position away from the side where the outer side wall is located, and then enter the first air window 16. Another part of the airflow will directly enter the first air window 16 along the outer side wall of the expanding portion 6. Since the dimensions of the expanding portion 6 in the height direction and the width direction are further increased, the flow rate of the centrifugal wind is further reduced, and the noise generated by the centrifugal wind is greatly reduced.

[0053] A straight portion 7 is further arranged on the first air duct 2. The straight portion 7 is a straight structure relative to the spiral first air duct 2. As shown in FIGS. 5 and 6, the straight portion 7 is arranged at the outer spiral turn 22 of the first air duct 2. The straight portion 7 can reduce the overall volume of the air exhaust assembly 1 to a certain extent, and can reduce the size of the air exhaust structure of the dust collector as much as possible on the basis of ensuring the length of the centrifugal wind ventilation path, thereby reducing the volume of the upper cover 14. Specifically, the straight portion 7 is located at the spiral radial position of the air inlet end of the first air duct 2. The included angle between the two ends of the straight portion 7 and the connection line of the spiral center 4 is defined as α, and the range of α is between 30° and 60°, and preferably 45°. In this way, the length of the straight portion 7 is neither too long to affect the noise reduction function, nor too short to cause the size of the air exhaust assembly 1 to be large.

[0054] It should be noted that the inner wall of the first air duct 2 is further provided with a sound-absorbing material. When the centrifugal wind flows in the spiral first air duct 2, part of the noise can be absorbed by the sound-absorbing material, thereby achieving good sound-absorbing effect. Specifically, the sound-absorbing material used is glass fiber cotton. The glass fiber cotton is a common sound-absorbing material, and its sound-absorbing effect is related to parameters such as thickness, density, and air flow resistance. The thickness is about 5 mm, and the thicker glass fiber cotton has better sound-absorbing effect.

[0055] The upper cover 14 and the air exhaust assembly 1 are located above the dust collecting barrel 18, a bottom cover 15 is arranged at the barrel opening of the dust collecting barrel 18, the bottom cover 15 is used for packaging the dust collecting barrel 18 and is also used for mounting and fixing the air exhaust assembly 1, the bottom cover 15 is provided with a spiral protruding structure or a groove structure, which can be used for positioning the air exhaust assembly 1, the bottom of the first air duct 2 is matched with the protruding structure or the groove structure on the bottom cover, so that the preliminary positioning of the air exhaust assembly 1 can be realized, and the bottom cover 15 is also provided with a positioning blind hole and the like, so that the air exhaust assembly 1 can be completely fixed on the bottom cover 15 through a screw and the like fastener.

[0056] A filter 19 is also fixedly arranged below the bottom cover 15, the filter 19 can filter most of the dust and larger particles in the suction airflow of the dust collector, and then guide the suction airflow into the air exhaust assembly 1, so that the dust collector can continuously perform the suction operation. After the suction airflow passes through the filter 19, most of the suction airflow enters the first air duct 2 and is discharged from the dust collector, and a part of the suction airflow enters the second air duct 3, so that the airflow in the second air duct 3 can normally flow.

[0057] Shock-absorbing rings 20 are also arranged on the upper and lower sides of the driving device 13, specifically, the shock-absorbing ring 20 arranged above the filter 19 is clamped with the bottom of the driving device 13 below the driving device 13, and another shock-absorbing ring 20 is arranged between the driving device 13 and the upper cover 14 above the driving device 13, when the upper cover 14 and the bottom cover 15 are fixed with the air exhaust assembly 1, the two shock-absorbing rings 20 can abut against the driving device 13, can buffer the driving device 13, prevent the driving device 13 from generating large vibration and noise during the dust collection operation, and also have a protection effect on the driving device 13 to prevent the driving device 13 from being damaged by large vibration.

[0058] It should be noted that a handle 24 is arranged on the upper part of the upper cover 14, and four universal wheels 25 are arranged on the bottom of the dust collecting barrel 18, the handle 24 can be used for carrying the entire dust collector, and the dust collecting barrel 18 can also be controlled to be pushed through the handle 24, and the dust collector can be carried through the universal wheels 25.

[0059] Embodiment 2: A mute dust collector as shown in Figs. 9 to 13 and in combination with the partial structure of Figs. 1 to 8 in Embodiment 1. The difference from Embodiment 1 is that in this solution, the flared portion 6 and the first air duct 2 are integrally formed, the top of the flared portion 6 is a first baffle 8 structure, the two sides of the flared portion 6 are along the spiral radial direction, and a second baffle 9 is further provided at the flared portion 6, the second baffle 9 is a bending piece, and the second baffle 9 is a circular arc-shaped inverted L-shaped structure, the upper end of the second baffle 9 is located above the first baffle 8, and the lower end of the second baffle 9 is located at the opening of the flared portion 6, and the first baffle 8, the second baffle 9 and the flared portion 6 together form a sound attenuation chamber 10 structure.

[0060] Wherein, a gap is provided between the first baffle 8 and the second baffle 9, a plurality of first sound attenuation holes 11 are provided on the first baffle 8, two positioning columns are further provided on the first baffle 8, and corresponding positioning holes are provided on the second baffle 9, so that the second baffle 9 can be fixed at the flared portion 6 through the positioning columns and the positioning holes. A second sound attenuation hole 12 is provided at the lower end of the second baffle 9, and the second sound attenuation hole 12 is located at the opening position of the flared portion 6. The first sound attenuation hole 11 and the second sound attenuation hole 12 are both small holes with a diameter of 3mm to 5mm, and the first sound attenuation hole 11 and the second sound attenuation hole 12 are usually circular, or can be regular or irregular polygonal, the circular shape is convenient for molding, and the diameters of the first sound attenuation hole 11 and the second sound attenuation hole 12 can be set to be unequal.

[0061] When the centrifugal wind in the first air duct 2 reaches the air outlet end of the first air duct 2, the centrifugal wind enters the inside of the flared portion 6 (the sound attenuation chamber 10), part of the airflow directly passes through the second sound attenuation hole 12 on the second baffle 9, and then enters the first air window 16 from the second sound attenuation hole 12 to be discharged to the outside of the dust collector, and the other part of the airflow passes through the first sound attenuation hole 11 on the first baffle 8 to be discharged from above the flared portion 6, and after the airflow passes through the first sound attenuation hole 11, it enters the area between the upper end of the first baffle 8 and the second baffle 9, and then flows to the first air window 16 to be discharged to the outside of the dust collector.

[0062] It should be noted that the sound attenuation chamber 10 structure can greatly reduce the noise of the airflow. Due to the effect of the second baffle 9, the ventilation area of the flared portion 6 will be reduced to a certain extent, so that the first sound attenuation hole 11 is provided on the first baffle 8 above the flared portion 6, the first sound attenuation hole 11 increases the exhaust space of the flared portion 6, so as to reduce the exhaust flow rate.

[0063] The sound absorbing material is also arranged inside the sound absorbing cavity 10. Specifically, the sound absorbing material is arranged on the first partition plate 8 and the second partition plate 9 and on the inner wall of the flared portion 6. Different from the sound absorbing material inside the first air duct 2, the sound absorbing material inside the sound absorbing cavity 10 can be plant fiber, which is a natural sound absorbing material such as cotton, wool, down, etc. These materials have porosity and can absorb sound waves and reduce reflection. The plant fiber also has good heat preservation and environmental protection performance. The structure of the sound absorbing cotton of the muffler is mostly in a felt-like or net-like structure. The felt-like structure is a compressed form of fiber material with a fixed thickness and density, which has good sound absorbing performance and damping performance. The net-like structure is a structure in which the fiber material is woven into a net shape, which can filter while having general sound absorbing effect.

[0064] Embodiment 3: A silent dust collector as shown in Figs. 14 to 18 and in combination with the partial structure of Figs. 1 to 13 in Embodiment 2, which is different from Embodiment 2 in that the structure of the air exhaust assembly 1 is different.

[0065] Specifically, a filter support 26 is arranged at the position of the opening of the dust collecting bucket 18. The filter support 26 is adapted to the opening of the dust collecting bucket 18 and also to the upper cover 14. The filter support 26 includes a fixed plate 261 adapted to the opening of the dust collecting bucket 18 and to the upper cover 14, and also includes an air inlet cylinder 262 located in the middle of the fixed plate 261. The bottom of the air inlet cylinder 262 protrudes towards the inside of the dust collecting bucket 18 and is provided with an air inlet hole 35 at the bottom. The top of the air inlet cylinder 262 also protrudes upwards as a mounting seat of the intermediate layer 28. A plurality of vertical rib structures are arranged on the outer surface of the bottom of the air inlet cylinder 262 to strengthen the structure of the bottom of the air inlet cylinder 262 and facilitate the installation of the filter support 26 in the dust collecting bucket 18 and the upper cover 14. A filter is arranged inside the filter support 26 to filter the suction airflow inside the dust collecting bucket 18. The top of the air inlet cylinder 262 and the fixed plate 261 are provided with a first air duct 2 in the form of a ring. Specifically, an air duct partition plate 36 is arranged in a ring shape between the top of the air inlet cylinder 262 and the fixed plate 261. The air duct partition plate 36 is arranged with the same center as the air inlet cylinder 262 and is separated from the air inlet cylinder 262 and the fixed plate 261. Thus, a first bifurcated flow channel 271 is formed between the air inlet cylinder 262 and the air duct partition plate 36, and a second bifurcated flow channel 272 is formed between the air duct partition plate 36 and the fixed plate 261. A through hole (not shown in the figure) is arranged on the air duct partition plate 36 to connect the first bifurcated flow channel 271 and the second bifurcated flow channel 272 together to form the first air duct 2.

[0066] The top side of the air inlet cylinder 262 is provided with an air cylinder partition plate 37, which is also separated from the inner core of the air inlet cylinder 262, and the air outlet 38 is formed on the air cylinder partition plate 37. When the suction airflow enters from the air inlet hole 35 at the bottom of the air inlet cylinder 262, it enters the cavity between the air cylinder partition plate 37 and the inner core of the air inlet cylinder 262, and then exits from the air outlet 38. A plurality of horizontal and vertical intersecting ribs are arranged on the air cylinder partition plate 37 to ensure the strength of the air cylinder partition plate 37. In addition, the air outlet 38 on the air cylinder partition plate 37 and the through hole on the air duct partition plate 36 are arranged at opposite positions on both sides of the air inlet cylinder 262. After the suction airflow exits from the air outlet 38, it enters the first bifurcated flow channel 271 and is divided in the first bifurcated flow channel 271, flows around the outside of the air inlet cylinder 262, and then converges at the through hole on the air duct partition plate 36, enters the second bifurcated flow channel 272, and continues to be divided in the second bifurcated flow channel 272, flows around the outside of the air duct partition plate 36. Through the design of the air duct partition plate 36, the flow path of the suction airflow is greatly lengthened, and because the air duct can be divided in two directions, the flow space of the airflow is greatly increased (equivalent to double air duct flow), so that the airflow exiting from the air inlet cylinder 262 can be at a lower flow rate, thereby reducing noise.

[0067] The position corresponding to the air outlet 38 on the second bifurcated flow channel 272 is provided with a wind guide partition plate 39, and an intermediate layer 28 is arranged on the upper part of the filter support 26. The bottom of the intermediate layer 28 is recessed, so as to cooperate with the top of the air inlet cylinder 262 to support the intermediate layer 28. The lower part of the intermediate layer 28 is also provided with a ring-shaped clamping groove structure or a clamping block, which is used to buckle the upper edge of the air duct partition plate 36 and the fixed plate 261, so as to realize the assembly of the intermediate layer 28 and the filter support 26, and also can cap the top of the first air duct 2, so that the first air duct 2 becomes a good sealing air duct.

[0068] The second air duct 3 is arranged in the intermediate layer 28 and communicates with the first air duct 2 at the position of the wind guide partition plate 39. Specifically, a layer plate 40 is arranged at the bottom of the intermediate layer 28, which separates the first air duct 2 and the second air duct 3, and also caps the top of the first air duct 2. A plurality of mesh holes (not shown in the figure) are arranged on the layer plate 40 and correspond to the position of the wind guide partition plate 39. The mesh holes are similar to the sound attenuation holes, and sound attenuation materials can be arranged at the mesh holes to attenuate the airflow from the first air duct 2 to the second air duct 3. The mesh holes connect the first air duct 2 and the second air duct 3. Similarly, two second air windows 17 are arranged at the position of the intermediate layer 28, which are respectively located on both sides of the wind guide partition plate 39.

[0069] When the suction air flow is gathered from the first air duct 2 to the air guide baffle 39, the suction air flow moves upward along the air guide baffle 39, enters the second air duct 3 through the mesh, and then is divided left and right on the second air duct 3, and finally is discharged from the two second air windows 17 on the sides of the cleaner. The upper cover 14 is buckled on the air exhaust assembly 1, and corresponding slots are arranged on the upper cover 14 corresponding to the positions of the two second air windows 17, for adapting the second air windows 17 and ensuring the air flow discharge.

[0070] The upper part of the middle layer 28 is a base structure with a middle convex edge recess, and a winding device is arranged on the upper part of the middle layer 28, which includes a tray 29 matched with the base (the upper part of the middle layer 28) and a rotating disc 30 located above the tray 29. The structure of the tray 29 is similar to that of the base, which is also a structure with a middle convex edge recess. A rotating assembly such as a rotating shaft and a bearing is arranged in the middle of the tray 29, and the rotating shaft is fixed with the structure of the rotating disc 30. A circular groove matched with the rotating disc 30 is arranged on the upper cover 14, so that the rotating disc 30 and the upper cover are on the same surface, and the rotating disc 30 and the upper cover 14 are exposed outside the cleaner together, so that the user can rotate the rotating disc 30. An outlet 33 is also arranged on the upper cover 14, and the outlet 33 is arranged on the side of the upper cover 14. The rotating disc 30 drives the tray 29 to rotate, and the rotating disc 30 rotates relative to the middle layer 28 at the bottom (the middle layer 28 does not rotate), so that the power cord of the cleaner can be wound on the structure of the tray 29. Since the middle of the tray 29 is convex and the edge is recessed, a containing space 32 is formed between the recessed area of the upper cover 14 and the tray 29 after the upper cover 14 is buckled and assembled, which can accommodate the wound power cord.

[0071] A roller 34 is also arranged on the outlet 33, which is rotatably connected to the position of the outlet 33 and is used for guiding the power cord. The direction of the power cord can be limited to prevent the power cord from being wound in different directions when being retracted and extended, which affects the subsequent use. A convex operation part 41 is arranged on the rotating disc 30, which facilitates the user to rotate the rotating disc 30. Similarly, a handle 24 is arranged on the rotating disc 30, which is used to move the cleaner structure.

Claims

1. A silent vacuum cleaner characterised in that, The exhaust assembly is arranged inside the upper cover, and the exhaust assembly comprises a first air duct and a second air duct.

2. A silent vacuum cleaner according to claim 1, wherein The first air duct is a spiral ring, the size of the first air duct gradually increases from the air inlet end to the air outlet end, the air outlet end of the first air duct is provided with a bending part, and the air outlet end of the first air duct is provided with a flared part along the spiral direction of the flared part.

3. A silent vacuum cleaner according to claim 2, wherein The vertical height ratio of the air outlet end to the air inlet end of the first air duct is in the range of (1, 2], and the width ratio of the air outlet end to the air inlet end of the first air duct is in the range of [1, 1.5].

4. A silent vacuum cleaner according to claim 2, wherein The first air duct is also provided with a flat part, and the included angle between the two ends of the flat part and the spiral center is in the range of 30° to 60°.

5. A silent vacuum cleaner according to claim 2, wherein The flared part is provided with a first baffle above it, and a bent second baffle is arranged at the flared part, one end of the second baffle is arranged above the first baffle, and the other end of the second baffle is located at the flared part to form a sound attenuation cavity, the first baffle is provided with a first sound attenuation hole, and the second baffle is provided with a second sound attenuation hole.

6. The silent vacuum cleaner of claim 1, wherein The exhaust assembly comprises a filter support and an intermediate layer, the first air duct is arranged in the filter support, and a bifurcated flow channel is further arranged in the first air duct, the intermediate layer is buckled above the first air duct, and the upper part of the intermediate layer is provided with a second air duct, and the bifurcated flow channel converges in the second air duct.

7. A silent vacuum cleaner according to claim 1 or 6, wherein The upper part of the intermediate layer is provided with a base, the base is provided with a winding device, and the winding device comprises a tray and a rotating disc.

8. A silent vacuum cleaner according to any one of claims 1 to 5, characterised in that The bottom cover is also provided, the exhaust assembly is fixed on the bottom cover, the upper cover is buckled on the exhaust assembly, and the upper cover is respectively provided with a first air window and a second air window corresponding to the first air duct and the second air duct.

9. A silent vacuum cleaner according to claim 8, wherein, The bottom cover is provided with a dust collecting barrel below, the dust collecting barrel is provided with a filter inside, and the filter is arranged at the bottom of the bottom cover and communicates with the first air duct and the second air duct.

10. A silent vacuum cleaner according to claim 7, wherein, The upper cover is also provided with a wire outlet, and the wire outlet is provided with a roller shaft.

11. A silent vacuum cleaner according to claim 2, wherein, The height of the first air duct is less than the height of the second air duct, and the second air duct passes through the outside of the first air duct.

12. A silent vacuum cleaner according to claim 11, wherein, The driving device is arranged at the spiral center, and the second air duct is fixed with the driving device at one end of the spiral center and covers the spiral center.

13. A silent vacuum cleaner according to claim 12, wherein, The driving device is provided with a damping ring above and below, and the driving device is further provided with a cooling device.

14. A silent vacuum cleaner as claimed in claim 2, wherein the fan is mounted on the motor. The air outlet end of the first air duct, the inner side wall of the first air duct is elongated along the spiral direction relative to the outer side wall, and the inner and outer side walls of the air outlet end of the first air duct are at different spiral radial positions and are bent outward along the spiral radial direction.

15. A silent vacuum cleaner according to claim 5, wherein, The first air duct and the sound attenuation cavity are provided with sound attenuation materials.

16. The silent vacuum cleaner of claim 9, wherein, The barrel opening of the dust collecting barrel is provided with a filter support, and the filter is arranged on the filter support.

17. A silent vacuum cleaner as claimed in claim 16, wherein The filter support comprises a fixing plate matched with the dust collecting barrel mouth and the upper cover, and an air inlet cylinder located at the middle part of the fixing plate, the bottom of the air inlet cylinder is towards the dust collecting barrel and is provided with an air inlet hole.

18. A silent vacuum cleaner as claimed in claim 17, wherein An annular first air duct is arranged between the air inlet cylinder and the fixing plate, an air duct partition plate is arranged between the air inlet cylinder and the fixing plate, and the air duct partition plate, the air inlet cylinder and the fixing plate are arranged in a concentric ring.

19. A silent vacuum cleaner according to claim 17, wherein, An air cylinder partition plate is arranged at the top side of the air inlet cylinder, the air cylinder partition plate is separated from the air inlet cylinder, and an air outlet is arranged on the air cylinder partition plate.

20. A silent vacuum cleaner as claimed in claim 18, wherein The first air duct comprises a first bifurcated flow channel between the air inlet cylinder and the air duct partition plate, and a second bifurcated flow channel between the air duct partition plate and the fixing plate, and the first bifurcated flow channel is communicated with the second bifurcated flow channel.

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