A purifier

Abstract

A purifier comprises a shell, both ends of which are provided with air inlets and air outlets along the axial direction thereof; an impeller provided inside the shell, a gap between the shell and the impeller constituting a flow passage; and a noise reduction part provided at the air inlet end of the flow passage, which comprises a first rib provided at the end of the impeller and a second rib provided at the inner side wall of the shell, at least one of the first rib and the second rib being provided with a sawtooth, and the first rib and the second rib being alternately distributed so that the gap therebetween forms a labyrinth structure in the shape of "S". Through the multi-layer synergy of sawtooth noise reduction, labyrinth structure dissipation and sound absorption of resonance film, the system can effectively cover low-frequency mechanical noise, medium-frequency airflow noise and high-frequency electromagnetic noise, and adapt to the requirements of complex acoustic environment.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a purifier. Background Technology

[0002] In existing centrifugal impeller structures, noise reduction is often achieved through features such as noise-reducing holes and toothed blades. Adding noise-reducing holes to the impeller blades significantly increases the difficulty of mold making, making product manufacturing more challenging and requiring greater investment. While biomimetic techniques can be used to add toothed structures to the blades, the limited number of serrations restricts the noise reduction effect due to limitations in mold making and manufacturing complexity. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a purifier.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A purifier, including

[0006] The casing has an air inlet and an air outlet at both ends along its axial direction;

[0007] An impeller is disposed inside the housing, and the gap between the housing and the impeller forms a flow channel; and

[0008] The noise reduction unit is located at the air inlet end of the flow duct. It includes a first rib located at the end of the impeller and a second rib located on the inner side wall of the housing. At least one of the first rib and the second rib is provided with serrations. The first rib and the second rib are alternately distributed so that the gap between them forms an "S"-shaped labyrinth structure.

[0009] Furthermore, the impeller is provided with a first cover plate and a second cover plate at both ends, and a plurality of first ribs are arranged circumferentially around the center of the first cover plate and distributed radially at intervals along the first cover plate.

[0010] Furthermore, the first rib is provided with serrations, and in the radial direction of the first cover plate and from the outside to the inside, in every two adjacent rings of serrations, the tip of the serration near the outer side of the first cover plate is located below the root of the adjacent serration near the inner side of the first cover plate.

[0011] Furthermore, the serration shape is one or more of triangle, rectangle, or arc, and the shape of the serration in each circle may be the same or different, and the shape of the serration in different circles may be the same or different.

[0012] Furthermore, along the radial direction of the first cover plate and from the inside out, the number of serrations in different rings gradually increases or remains the same.

[0013] Furthermore, a plurality of the second ribs are arranged circumferentially around the air inlet of the housing and are distributed radially at intervals along the air inlet.

[0014] Furthermore, along the radial direction of the housing and toward the air inlet, in every two adjacent rings of the second rib, the second rib closer to the air inlet is located below the adjacent second rib farther from the air inlet.

[0015] Furthermore, the housing is provided with noise reduction holes between two adjacent second ribs, and the noise reduction holes are connected to the outside.

[0016] Furthermore, a resonant diaphragm is provided on the outer surface of the housing at the location of the noise reduction hole to reduce noise in a specific frequency band.

[0017] Furthermore, it also includes a drive unit detachably connected to the housing, the output end of which is drively connected to the second cover plate of the impeller.

[0018] The beneficial effects of this utility model are:

[0019] 1. The air purifier proposed in this utility model has a serrated design. When the airflow passes through the gaps between the serrations, it undergoes multiple abrupt changes in direction, which prolongs the sound wave propagation path and dissipates sound energy through friction and collision between air molecules. It is particularly effective in attenuating discrete noise.

[0020] 2. The air purifier proposed in this utility model has a labyrinth structure, which requires the airflow to turn multiple times when passing through, generating local turbulence and destroying the coherence of sound waves. At the same time, it converts sound energy into heat energy through viscous dissipation. This physical barrier is particularly effective in suppressing mid-to-high frequency noise.

[0021] 3. The air purifier proposed in this utility model has a resonant membrane. The flexible characteristics of the resonant membrane can adapt to different pressure fluctuations, realize dynamic matching of acoustic impedance, and avoid the narrow frequency band problem of traditional rigid structures. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a noise-reducing impeller according to the present invention;

[0024] Figure 2This is a cross-sectional view of a purifier according to the present invention;

[0025] Figure 3 for Figure 2 A magnified view of point A.

[0026] In the figure, 101 is the first cover plate; 102 is the second cover plate; 103 is the impeller; 104 is the first rib; 1041 is the serration; 20 is the drive unit; 30 is the housing; 301 is the air inlet; 302 is the air outlet; 303 is the second rib; 304 is the noise reduction hole; 40 is the flow duct; and 50 is the resonant membrane. Detailed Implementation

[0027] The following is combined with Figure 1-3 This utility model will be described in detail.

[0028] A purifier, including

[0029] The housing 30 has an air inlet 301 and an air outlet 302 at both ends along its axial direction;

[0030] Impeller 103 is disposed inside the housing 30, and the gap between the housing 30 and the impeller 103 forms a flow channel 40; and

[0031] The noise reduction unit is located at the air inlet end of the flow duct 40. It includes a first rib 104 located at the end of the impeller 103 and a second rib 303 located on the inner side wall of the housing 30. At least one of the first rib 104 and the second rib 303 is provided with serrations 1041. The first rib 104 and the second rib 303 are alternately distributed so that the gap between them forms an "S"-shaped labyrinth structure.

[0032] The "S"-shaped labyrinth structure can block airflow between the ribs and the serrations 1041. Circumferential ribs are provided on the air inlet 301 side of the housing 30, intersecting with the serrations 1041 to form a multi-turn airflow path, dissipating energy through turbulence. On the air inlet 301 side, the circumferential ribs on the inner wall of the housing 30 are arranged alternately with the serrations 1041, forming an "S"-shaped tortuous channel. Airflow must turn multiple times as it passes through, generating local turbulence and disrupting acoustic coherence. This physical barrier is particularly effective in suppressing mid-to-high frequency noise.

[0033] The detachable housing 30 encloses the impeller 103, and the inner wall is provided with a sound-absorbing layer. It forms a gradually narrowing flow channel with the outer edge of the impeller 103 to stabilize the airflow. The flow channel 40 between the housing 30 and the impeller 103 is designed to be gradually narrowed to guide the airflow to maintain the flow attached to the wall when it accelerates, avoid energy loss and secondary eddies caused by sudden expansion, maintain efficient air volume output while suppressing noise sources.

[0034] In this embodiment, the impeller 103 is provided with a first cover plate 101 and a second cover plate 102 at both ends, and a plurality of first ribs 104 are arranged circumferentially around the center of the first cover plate 101 and distributed radially at intervals along the first cover plate 101.

[0035] The first cover plate 101 and the second cover plate 102 are arranged parallel to each other, with a gap between them. The impeller 103 is disposed between the first cover plate 101 and the second cover plate 102. The upper edge of the first cover plate 101 is provided with a flanged reinforcement structure to improve rigidity. The impeller 103 includes multiple backward-curved blades evenly distributed between the two cover plates, which are fixed by welding to form a centrifugal impeller 103 structure. In other embodiments, the impeller 103 and the second cover plate 102 are integrally formed.

[0036] Furthermore, the first rib 104 is provided with serrations 1041, and along the radial direction of the first cover plate 101 from the outside to the inside, in every two adjacent rings of serrations 1041, the tip of the serration 1041 near the outer side of the first cover plate 101 is located below the root of the adjacent serration 1041 near the inner side of the first cover plate 101. Multiple levels of first ribs 104 are radially distributed on the outer surface of the first cover plate 101, and each level of noise reduction is composed of serrations 1041 of different shapes arranged circumferentially.

[0037] The 1041 serrations are arranged in a staggered pattern. From the inside out, the tips and roots of adjacent 1041 serrations partially overlap vertically, guiding the airflow through a stepped arrangement to attenuate noise in layers. The tips and roots of adjacent 1041 serrations are vertically staggered, forming a stepped overlapping structure. This design forces the airflow to undergo multiple abrupt changes in direction as it passes through the gaps between the 1041 serrations, lengthening the sound wave propagation path and dissipating sound energy through friction and collisions between air molecules. It is particularly effective at attenuating discrete noise, such as the noise at the blade passing frequency.

[0038] In this embodiment, the serration 1041 is one or more of the following shapes: triangle, rectangle, or arc. The shape of the serration 1041 in each circle may be the same or different, and the shape of the serration 1041 in different circles may be the same or different.

[0039] The multi-level sawtooth 1041, such as triangular, rectangular, and arc-shaped sawtooth 1041 distributed radially along the first cover plate 101, uses differences in geometric shape to directionally interfere with broadband noise generated by airflow. The sharp edges of the triangular sawtooth 1041 can decompose high-frequency eddies, the rectangular sawtooth 1041 forms a sound wave reflection path through regular arrangement, and the arc-shaped sawtooth 1041 reduces airflow stripping noise through smooth transition. The combination of sawtooth 1041 of different shapes covers the noise frequency band from low frequency to high frequency. The arrangement of sawtooth 1041 of different shapes produces scattering and interference effects on noise in different frequency bands.

[0040] In this embodiment, along the radial direction of the first cover plate 101 from the inside to the outside, the number of serrations 1041 in different rings gradually increases or remains the same. Three to five concentric annular ribs are radially arranged on the windward side of the first cover plate 101, with the rib height increasing progressively from the inside to the outside. Viewed radially from the outside to the inside, the tips of the outer ribs are aligned with the recessed areas at the roots of the adjacent inner ribs, thus guiding airflow.

[0041] In this embodiment, a plurality of second ribs 303 are arranged circumferentially around the air inlet 301 of the housing 30 and are distributed radially at intervals along the air inlet 301. Further, along the radial direction of the housing 30 and towards the air inlet 301, in every two adjacent rings of second ribs 303, the second rib 303 closer to the air inlet 301 is located below the adjacent second rib 303 farther from the air inlet 301. The second ribs 303 of the housing 30 are distributed in a "stepped" manner along the air intake direction, with the second rib 303 near the air inlet 301 positioned lower than the second rib 303 farther from the air inlet 301. When the impeller 103 rotates, the first rib 104 on the first cover plate 101 and the second ribs 303 of the housing 30 form an axially interlocking meshing relationship.

[0042] In this embodiment, the housing 30 is provided with noise reduction holes 304 between two adjacent second ribs 303, and the noise reduction holes 304 are connected to the outside. The housing 30 has an array of noise reduction holes 304 and is covered with a resonant membrane 50, which generates an acoustic impedance matching absorption effect for noise in a specific frequency band.

[0043] In this embodiment, a resonant membrane 50 is provided on the outer surface of the housing 30 at the location of the noise reduction hole 304 to reduce noise in a specific frequency band. The noise reduction hole 304 and the resonant membrane 50 on the surface of the housing 30 form a tuning system. By adapting the cavity volume and membrane material parameters, noise in a specific frequency band, such as electromagnetic noise from a motor or the resonant frequency of blade rotation, is precisely absorbed. The flexible characteristics of the resonant membrane 50 can adapt to different pressure fluctuations, achieving dynamic matching of acoustic impedance and avoiding the narrow frequency band problem of traditional rigid structures.

[0044] In this embodiment, a drive device 20 is also included, which is detachably connected to the housing 30. The output end of the drive device 20 is driven to the second cover plate 102 of the impeller 103. A motor is centrally connected to the second cover plate 102, and a shock-absorbing component is provided at the connection to isolate mechanical vibration. The housing 30 and the drive device 20 are connected by a snap-fit ​​or standardized interface, which can be quickly disassembled without tools, facilitating cleaning or replacement of noise reduction components, such as the resonant diaphragm 50 and sound-absorbing cotton.

[0045] This utility model provides an air purifier that, through the synergistic effect of 1041 serrated geometric noise reduction, labyrinth dissipation, and resonant sound absorption, effectively covers low-frequency mechanical noise, mid-frequency airflow noise, and high-frequency electromagnetic noise, adapting to complex acoustic environments, such as industrial scenarios where equipment roars and airflow whistles coexist. By increasing or decreasing the number of 1041 serrations, adjusting the rib density, or changing the parameters of the resonant diaphragm 50, users can customize the noise reduction intensity for specific scenarios, such as ultra-quiet laboratory needs or daily home use, avoiding cost waste caused by over-design.

[0046] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A purifier, characterized in that, include The casing has an air inlet and an air outlet at both ends along its axial direction; An impeller is disposed inside the housing, and the gap between the housing and the impeller forms a flow channel; and The noise reduction unit is located at the air inlet end of the flow duct. It includes a first rib located at the end of the impeller and a second rib located on the inner side wall of the housing. At least one of the first rib and the second rib is provided with serrations. The first rib and the second rib are alternately distributed so that the gap between them forms an "S"-shaped labyrinth structure.

2. The air purifier as described in claim 1, characterized in that, The impeller is provided with a first cover plate and a second cover plate at both ends, and a plurality of first ribs are arranged circumferentially around the center of the first cover plate and distributed radially at intervals along the first cover plate.

3. The air purifier as described in claim 2, characterized in that, The first rib is provided with serrations, and in the radial direction of the first cover plate and from the outside to the inside, in every two adjacent rings of serrations, the tip of the serration near the outside of the first cover plate is located below the root of the serration near the inside of the adjacent first cover plate.

4. The air purifier as described in claim 2, characterized in that, The serration shape is one or more of triangle, rectangle or arc, and the shape of the serration in each circle may be the same or different, and the shape of the serration in different circles may be the same or different.

5. The air purifier as described in claim 2, characterized in that, Along the radial direction of the first cover plate and from the inside out, the number of serrations in different rings gradually increases or remains the same.

6. The air purifier as described in claim 1, characterized in that, Several second ribs are arranged circumferentially around the air inlet of the housing and are distributed radially at intervals along the air inlet.

7. The air purifier as described in claim 1, characterized in that, Along the radial direction of the housing and toward the air inlet, in every two adjacent rings of the second rib, the second rib closer to the air inlet is located below the adjacent second rib farther away from the air inlet.

8. The air purifier as described in claim 1, characterized in that, The housing has noise reduction holes located between two adjacent second ribs, and the noise reduction holes are connected to the outside.

9. The air purifier as described in claim 8, characterized in that, The outer surface of the housing is provided with a resonant membrane at the location of the noise reduction hole to reduce noise in a specific frequency band.

10. The air purifier as described in claim 2, characterized in that, It also includes a drive unit, which is detachably connected to the housing, and the output end of the drive unit is driven to the second cover plate of the impeller.

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