CN220608816U - Air inlet noise reduction structure for sleeping respirator - Google Patents
Air inlet noise reduction structure for sleeping respirator Download PDFInfo
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- CN220608816U CN220608816U CN202320769752.9U CN202320769752U CN220608816U CN 220608816 U CN220608816 U CN 220608816U CN 202320769752 U CN202320769752 U CN 202320769752U CN 220608816 U CN220608816 U CN 220608816U
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- air passage
- noise reduction
- inlet
- reduction structure
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- 238000005452 bending Methods 0.000 claims abstract description 4
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- 238000003379 elimination reaction Methods 0.000 abstract description 11
- 229920000742 Cotton Polymers 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229920001296 polysiloxane Polymers 0.000 description 1
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model relates to the technical field of medical equipment, in particular to an air inlet noise reduction structure for a sleeping respirator. The noise reduction structure is connected between the air passage inlet and the air passage inlet of the host; the noise reduction structure comprises an air passage cavity piece and a cover piece matched with the air passage cavity piece, wherein a bending type flow guide rib is arranged in the air passage cavity piece and used for forming a plurality of independent gas passages. The utility model adopts a novel anti-noise elimination structure of the air inlet of the sleeping respirator, the air inlet channel is divided into two parts from the inlet by the curved guide rib, two layers of air channels are formed with the air channel wall, then the two layers of air channels are intersected to generate air hedging, the cross section area of the air channel is reduced after the air channels pass through the long and narrow air channels, and the friction noise generated by high-speed air is reduced; on the other hand, noise transmitted outside through the gas path inside the machine is suppressed by reflection and interference of the acoustic wave.
Description
Technical Field
The utility model relates to the technical field of medical equipment, in particular to an air inlet noise reduction structure for a sleeping respirator.
Background
At present, the noise reduction scheme of the sleeping respirator mainly aims at a fan and an air outlet air channel, and the noise reduction scheme of the main machine and the air outlet air channel mainly comprises resistance noise elimination and resistance noise elimination, and the specific implementation method comprises expansion cavity (resistance noise elimination), bypass noise elimination (resistance noise elimination), sound absorption cotton (resistance noise elimination), small hole/micropore noise elimination (resistance noise elimination) and the like.
Because the resistance noise reduction structure at the air inlet part needs a certain space, the resistance noise reduction scheme is few, most of the resistance noise reduction schemes are the resistance noise elimination (noise reduction scheme of sound absorption cotton), the sound absorption cotton is added in the air inlet air channel, the noise reduction effect of the noise reduction mode aiming at noise in different frequency bands is greatly different due to the problem of fixing the inner aperture of the sound absorption cotton, the universality is poor, and meanwhile, the hidden danger of pollution of the sound absorption cotton in the high-speed air channel is caused. At present, the sleeping respirator has the condition that the noise of an air inlet is higher, wherein the noise source of the air inlet is analyzed to be the noise generated by high-speed air and the noise transmitted by the operation of parts (such as a fan and the like) in the machine. Therefore, there is a need for a novel air inlet noise reduction structure for a sleep ventilator that can effectively solve the problem.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides an air inlet noise reduction structure for a sleeping respirator.
The utility model provides an air inlet noise reduction structure for a sleeping respirator, which is connected between an air passage inlet and a main machine air passage inlet; wherein,
the noise reduction structure comprises an air passage cavity piece and a cover piece matched with the air passage cavity piece, wherein a bending type flow guide rib is arranged in the air passage cavity piece and used for forming a plurality of independent air passages.
Preferably, the air passage cavity piece comprises an air passage inlet part and a host air passage inlet part which are connected in sequence, and the flow passage sectional area of the air passage inlet part is larger than that of the host air passage inlet part.
Preferably, the curved flow guide rib is arranged in the gas path inlet part.
Preferably, the shape of the curved guide rib is one of U-shaped, L-shaped or W-shaped.
Preferably, the curved guide rib is used for forming two independent gas passages, and the gas path design length of the two gas passages is that the distance difference of sound propagation is odd times of half wavelength of sound waves to be eliminated.
Compared with the prior art, the utility model has the advantages that:
the utility model adopts a novel anti-noise elimination structure of the air inlet of the sleeping respirator, the air inlet channel is divided into two parts from the inlet by the curved guide rib, two layers of air channels are formed with the air channel wall, then the two layers of air channels are intersected to generate air hedging, the cross section area of the air channel is reduced after the air channels pass through the long and narrow air channels, and the friction noise generated by high-speed air is reduced; on the other hand, noise transmitted outside through the gas path inside the machine is suppressed by reflection and interference of the acoustic wave.
Drawings
FIG. 1 is a structural view of the present utility model;
FIG. 2 is an air flow intake pattern of the present utility model;
FIG. 3 is a flow chart of the flow of the present utility model with flow field direction controlled by different flow rates of the gas paths;
FIG. 4 is a schematic diagram of the reflection interference of sound waves in the gas path directly connected with the gas outlet (the broken line is a reflected wave);
FIG. 5 is a schematic diagram of the reflection interference of the sound wave of the whole gas circuit (the broken line is the reflected wave);
reference numerals
1. A filter element cover, 2, a filter element, 3, an air inlet cover, 4 cover parts, 5 and an air passage cavity part, 5-1, an air channel inlet part, 5-2, a main machine air channel inlet part, 6 and a bending type flow guide rib.
Detailed Description
The technical scheme of the utility model is described in detail below with reference to the accompanying drawings and examples.
The utility model provides an air inlet noise reduction structure (shown in figures 1-2) for a sleeping respirator, which comprises a filter element cover 1, a filter element 2, an air inlet cover 3, a cover piece 4 and an air passage cavity piece 5, wherein the filter element 2 is connected with the filter element cover 1, the filter element cover 1 is connected with the air inlet cover 3, and the three components form an air passage inlet and play a role in filtering air. The cover piece 4 is connected with the air passage cavity piece 5 to form a noise reduction structure and is connected between the air passage inlet and the air passage port of the host. The noise reduction unit formed by the cover piece 4 and the air passage cavity piece 5 can form an integral unit or can be connected through a clamping type; other flexible materials such as silicone, TPU, etc. may be selected; the air passage section can be in other shapes, preferably in an oblong shape, the bottom of the air passage cavity piece 5 is provided with a bent guide rib 6, and the bent guide rib 6 is used for forming a plurality of independent air passages; the air channel of the guide rib is divided, the shape of the guide rib can be adjusted according to actual requirements, the guide rib is not limited to U-shaped guide ribs, L-shaped guide ribs or W-shaped guide ribs can be used, and the like.
The air passage cavity piece 5 comprises an air passage inlet part 5-1 and a host air passage inlet part 5-2 which are connected in sequence, and the flow passage sectional area of the air passage inlet part is larger than that of the host air passage inlet part. The bent guide rib is arranged in the air channel inlet part. (as shown in figure 3). The bent guide rib is arranged at a position with a relatively large flow passage sectional area of the airway cavity piece. After the high-speed air enters the noise reduction structural unit, the air flow is divided into an upper flow channel and a lower flow channel through the bent guide ribs 6, the two flow channel sections are different in cross section area, the air flow with different flow rates is converged with an outlet air channel along the air channel formed by the outer wall and the guide ribs, the air flow is converged, the air flow enters a subsequent air channel with smaller cross section area, after the air flow passes through the long and narrow air channel, the flow rate of the process air is reduced, vortex generation is reduced, and noise generated by friction of the air channel is further reduced.
The noise generated by the host computer is transmitted through the air channels, and reflected and interfered by the two sections of air channels of the cover piece 4 and the air channel cavity piece 5 sequentially, when the difference of the propagation length distances of the sound waves of the two air channels is odd times of the half wavelength of the wave to be muffled, the phases of the two sound waves at the junction are opposite, so that the purpose of mutual cancellation is achieved, and the noise is effectively attenuated (as shown in figures 4-5).
The utility model utilizes the structure design of the bent guide rib of the air inlet channel for layering, and forms a plurality of independent air channels with the air channel wall through the bent rib in a limited space. The flow velocity difference is generated by utilizing the difference of different flow passage areas under the same pressure, the flow field direction is controlled, the flow enters the subsequent gas passage with smaller cross section smoothly at a lower speed, the flow and the pressure lost due to the reduction of the cross section of the flow passage are reduced, and the noise generated by the gas is reduced.
According to the utility model, after the main gas path is divided into a plurality of gas paths through structural design, the sectional area of an independent flow passage is reduced, and the calculation formula is calculated according to the Reynolds number:
wherein the smaller the cross-sectional characteristic length d, the smaller the reynolds number, the fluid flow tends to be laminar, and the less noise is generated.
Compared with the traditional straight-through gas flow channel, the structure of the utility model obviously reduces the noise generated by high-speed gas flow in the flow channel under the condition of the same flow rate in a mode that the bent flow guide ribs firstly layer the gas channel and then converge, and the structure occupies smaller space. The structural member has the advantages of resistance, noise reduction, moisture resistance, low material requirement, better noise reduction cost and effect than those of a resistive muffler (sound absorbing cotton), better experience for users and reduced production cost in the environment with larger flow velocity and higher cleaning requirement. The structure is subsequently improved to be manufactured into the air inlet noise reduction device, and the air inlet noise reduction device is used as a product accessory and has a wider application range.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and are not limiting. Although the present utility model has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the appended claims.
Claims (4)
1. The air inlet noise reduction structure for the sleeping respirator is characterized by being connected between an air passage inlet and a main machine air passage inlet; wherein,
the noise reduction structure comprises an air passage cavity piece and a cover piece matched with the air passage cavity piece, wherein a bent flow guide rib is arranged in the air passage cavity piece and used for forming a plurality of independent gas passages;
the bending type flow guide ribs are used for forming two independent gas passages, the difference value of the gas path sound wave propagation distances of the two gas passages is odd times of half wavelength of sound waves to be eliminated, and the phases of the two sound waves are opposite and offset.
2. The air inlet noise reduction structure according to claim 1, wherein the air passage cavity member includes an air passage inlet portion and a host air passage inlet portion connected in sequence, and a flow passage sectional area of the air passage inlet portion is larger than that of the host air passage inlet portion.
3. The air inlet noise reduction structure according to claim 2, wherein the curved deflector rib is disposed in the air inlet portion.
4. The air intake noise reduction structure according to claim 1, wherein the curved deflector rib has one of a U-shape, an L-shape, or a W-shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320769752.9U CN220608816U (en) | 2023-04-10 | 2023-04-10 | Air inlet noise reduction structure for sleeping respirator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320769752.9U CN220608816U (en) | 2023-04-10 | 2023-04-10 | Air inlet noise reduction structure for sleeping respirator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220608816U true CN220608816U (en) | 2024-03-19 |
Family
ID=90212368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320769752.9U Active CN220608816U (en) | 2023-04-10 | 2023-04-10 | Air inlet noise reduction structure for sleeping respirator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220608816U (en) |
-
2023
- 2023-04-10 CN CN202320769752.9U patent/CN220608816U/en active Active
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