Pressure reduction and noise reduction device for air inlet end of equipment and oxygen-enriched generator

Abstract

The utility model relates to the technical field of medical care equipment, and discloses a decompression and noise reduction device and an oxygen-enriched generator for an air inlet end of equipment, the decompression and noise reduction device comprises a shell, the shell is provided with a silencing cavity, an air inlet and an air outlet, and the air inlet and the air outlet are respectively arranged at two ends of the silencing cavity. The silencing cavity is divided into a plurality of silencing unit cavities by partition plates located between the air inlet and the air outlet, the partition plates are provided with silencing holes communicating every two adjacent silencing unit cavities, and at least one silencing unit cavity is provided with protrusions between every two adjacent partition plates. The protrusion extends in the direction intersecting with the axial direction of the air inlet. The pressure reduction and noise reduction device for the air inlet end of the equipment can effectively reduce air inlet noise.

Description

Technical Field

[0001] The utility model relates to the technical field of healthcare equipment, in particular to a decompression and noise reduction device for the air inlet end of a device and an oxygen-enriched generator. Background Art

[0002] The micro-pressure oxygen-enriched cabin consists of a cabin body that can form a closed environment and an oxygen-enriched generator. The oxygen-enriched generator provides a pressure greater than the ambient pressure to the cabin body and supplies oxygen into the cabin to form an oxygen-enriched environment inside the cabin, which can be used for health care and rehabilitation to meet the user's need to improve sleep quality.

[0003] Among them, the oxygen-enriched generator mainly includes a pressurization system and an oxygen generation system, and the two systems are controlled by electromagnetic valves. When the oxygen-enriched generator is turned on, the pressurization system starts to work first, and the pressure inside the cabin increases. When the set pressure is reached, the pressurization system and the oxygen generation system work together to form an oxygen-enriched environment inside the cabin. When the pressure inside the cabin is higher than the set value, the electromagnetic valve for controlling pressure relief will open, and the air inside the cabin will be discharged outside the cabin. When the pressure inside the cabin drops to the set pressure, the electromagnetic valve closes.

[0004] When the existing micro-pressure oxygen-enriched cabin opens the electromagnetic valve to intake air into the cabin body, the generated noise is relatively large, affecting the user experience. Therefore, it is necessary to provide a decompression and noise reduction device for the air inlet end of the device to effectively reduce the intake noise of the cabin body. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a decompression and noise reduction device for the air inlet end of a device, which can effectively reduce the intake noise.

[0006] To solve the above technical problem, the utility model provides a decompression and noise reduction device for the air inlet end of a device, including a housing. The housing is provided with a sound absorption cavity, an air inlet and an air outlet. The air inlet and the air outlet are respectively arranged at both ends of the sound absorption cavity. The sound absorption cavity is divided into a plurality of sound absorption unit chambers by a partition located between the air inlet and the air outlet. The partition is provided with sound absorption holes communicating adjacent two of the sound absorption unit chambers. At least one of the sound absorption unit chambers is provided with a protrusion between adjacent two of the partitions, and the protrusion extends along a direction intersecting with the axial direction of the air inlet.

[0007] As an improvement of the above solution, sound absorption cotton is arranged in the sound absorption cavity.

[0008] As an improvement of the above solution, the sound absorption cotton is filled between adjacent two of the partitions, or each of the sound absorption unit chambers is filled with the sound absorption cotton.

[0009] As an improvement of the above solution, the sound absorption cotton is extruded and deformed by the protrusion.

[0010] As an improvement of the above solution, the protrusions are arranged on opposite sides of the silencing unit chamber or circumferentially around the silencing unit chamber.

[0011] As an improvement of the above solution, the protrusions are symmetrically arranged on both sides of the silencing unit chamber.

[0012] As an improvement of the above solution, the air inlet and the air outlet are coaxially arranged.

[0013] As an improvement of the above solution, the aperture of the silencing hole is d1, the aperture of the air inlet is d2, the aperture of the air outlet is d3, the distance between the end of the protrusion and the axis of the air inlet is D1, and the distance between the base of the protrusion and the axis of the air inlet is D2, where d = 0.8 - 1.2 mm, d2 = d3 = 7 - 12 mm, and D1 / D2 = 1 / 2 - 2 / 3.

[0014] As an improvement of the above solution, the housing includes a cover body and a bottom shell. The bottom shell is provided with a sealing groove surrounding the silencing cavity, and a sealing ring is arranged in the sealing groove. The sealing ring abuts against the cover body.

[0015] In addition, the present utility model also provides an oxygen-enriched generator, which includes a pressure chamber, a boosting solenoid valve, and the above-mentioned decompression and noise reduction device for the air inlet end of the equipment. The air inlet is communicated with the boosting solenoid valve, and the air outlet is communicated with the pressure chamber.

[0016] Implementing the present utility model has the following beneficial effects:

[0017] The present utility model discloses a decompression and noise reduction device for the air inlet end of equipment. By arranging a partition between the air inlet and the air outlet of the silencing cavity, the silencing cavity is divided into multiple silencing unit chambers. When the air flow passes through each silencing unit chamber and the silencing holes on each partition, the noise will gradually decrease. In addition, the extending direction of the protrusions arranged in the silencing unit chamber intersects with the axial direction of the air inlet. On the one hand, it can change the gas flow direction close to the wall of the silencing cavity to assist in noise reduction. On the other hand, it can help increase the flow rate so that the flow rate of the air inlet is basically equal to the flow rate of the air outlet. Installing the decompression and noise reduction device for the air inlet end of the equipment on the oxygen-enriched generator will basically not reduce the instantaneous air intake flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the first embodiment of a decompression and noise reduction device for the air inlet end of equipment according to the present utility model;

[0019] Figure 2 is Figure 1 a schematic cross-sectional structural diagram of the decompression and noise reduction device for the air inlet end of equipment passing through the central axis of the silencing pipe;

[0020] Figure 3 It is a schematic structural diagram of the second embodiment of a decompression and noise reduction device for the air inlet end of a device according to the present utility model.

[0021] Figure 4 It is a schematic structural diagram of an embodiment of an oxygen-enriched generator according to the present utility model. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] As Figure 1 and Figure 2 shown, the present utility model discloses a first embodiment of a decompression and noise reduction device for the air inlet end of a device, including a housing 1. The housing 1 is provided with a sound absorption cavity 11, an air inlet 12 and an air outlet 13. The air inlet 12 and the air outlet 13 are respectively arranged at both ends of the sound absorption cavity 11. At least two partition plates 2 are arranged in sequence between the air inlet 12 and the air outlet 13. The sound absorption cavity 11 is separated into a plurality of sound absorption unit chambers 111 by the partition plates 2. The partition plates 2 are provided with sound absorption holes 21 communicating adjacent two of the sound absorption unit chambers 111. At least one of the sound absorption unit chambers 111 is provided with a protrusion 14 between adjacent two of the partition plates 2. The protrusion 14 extends along a direction intersecting the axial direction of the air inlet 12.

[0024] In this embodiment, by arranging the partition plates 2 between the air inlet 12 and the air outlet 13 of the sound absorption cavity 11, the sound absorption cavity 11 is separated into a plurality of sound absorption unit chambers 111. When the air flow passes through each of the sound absorption unit chambers 111 and the sound absorption holes 21 on each of the partition plates 2, the noise will be gradually reduced. In addition, the extending direction of the protrusion 14 arranged in the sound absorption unit chamber 111 intersects the axial direction of the air inlet 12. On the one hand, it can change the gas flow direction close to the cavity wall of the sound absorption cavity 11 to assist in noise reduction. On the other hand, it can help improve the flow rate, so that the flow rate at the air inlet 12 is basically equal to the flow rate at the air outlet 13. When the decompression and noise reduction device for the air inlet end of the device is installed on an oxygen-enriched generator, the instantaneous air intake flow rate will basically not be reduced, and large fluctuations in the flow rate during startup and shutdown can be avoided.

[0025] The partition plate 2 and the housing 1 of this embodiment can be integrally formed, or the two can be separately arranged, and the partition plate 2 is fixedly connected into the sound absorption cavity 11 of the housing 1.

[0026] Among them, the housing 1 of this embodiment includes a cover body 1a and a bottom shell 1b. The bottom shell 1b is provided with a sealing groove 15 arranged around the sound absorption cavity 11. A sealing ring (not shown in the figure) is arranged in the sealing groove 15. The sealing ring abuts against the cover body 1a, so that the sound absorption cavity 11 is only communicated with the outside through the air inlet 12 and the air outlet 13 on the bottom shell 1b.

[0027] The air inlet 12 and the air outlet 13 are preferably arranged on opposite sides of the sound absorption cavity 11, and the air inlet 12 and the air outlet 13 are coaxially arranged. At the same time, both the air inlet 12 and the air outlet 13 are arranged facing the partition 2, so that the air flow can quickly pass through the entire sound absorption cavity 11.

[0028] As Figure 3 Shown in the figure, to further improve the sound absorption effect, the present utility model discloses a second embodiment of a pressure reducing and noise reducing device for the air inlet end of a device, including a housing 1. The housing 1 is provided with a sound absorption cavity 11, an air inlet 12 and an air outlet 13. The air inlet 12 and the air outlet 13 are respectively arranged at both ends of the sound absorption cavity 11. At least two partitions 2 are arranged in sequence between the air inlet 12 and the air outlet 13. The sound absorption cavity 11 is divided into multiple sound absorption unit chambers 111 by the partitions 2. The partitions 2 are provided with sound absorption holes 21 communicating adjacent two of the sound absorption unit chambers 111. At least one of the sound absorption unit chambers 111 is provided with a protrusion 14 between adjacent two of the partitions 2. The protrusion 14 extends along a direction intersecting the axial direction of the air inlet 12. In addition, in this embodiment, a porous inorganic material with a sound absorption and noise reduction function, namely sound absorption cotton 3, is also arranged in the sound absorption cavity 11.

[0029] The sound absorption cotton 3 is preferably filled between adjacent two of the partitions 2 and is deformed by the extrusion of the protrusion 14. The sound absorption cotton 3 will be compressed by the extrusion of the structure of the protrusion 14, and some of the pore structures inside the sound absorption cotton 3 will be deformed, increasing the sound absorption capacity per unit volume, which can help improve the sound absorption effect of this sound absorption unit chamber 111.

[0030] More preferably, the sound absorption cotton 3 is filled in each of the sound absorption unit chambers 111 to improve the sound absorption effect of each sound absorption unit chamber 111. Among them, in the sound absorption unit chamber 111 provided with the protrusion 14, the sound absorption cotton 3 will be compressed by the extrusion of the structure of the protrusion 14, and some of the pore structures inside the sound absorption cotton 3 will be deformed, which can help improve the sound absorption effect of this sound absorption unit chamber 111.

[0031] The protrusion 14 is arranged on opposite sides of the sound absorption unit chamber 111 or is arranged circumferentially around the sound absorption unit chamber 111.

[0032] The protrusion 14 preferably extends along a direction perpendicular to the axial direction of the air inlet 12 and is symmetrically arranged on both sides of the sound absorption unit chamber 111, so that the protrusion 14 causes uniform deformation of opposite sides of the sound absorption cotton 3 and at the same time causes more concentrated deformation along the air flow direction in the sound absorption cavity 11, further improving the sound absorption effect.

[0033] In this embodiment, the aperture diameter of the sound absorption hole 21 is d1, the aperture diameter of the air inlet 12 is d2, the aperture diameter of the air outlet 13 is d3, the distance between the end of the protrusion 14 and the axis of the air inlet 12 is D1, and the distance between the base of the protrusion 14 and the axis of the air inlet 12 is D2, where d = 0.8 - 1.2 mm, d2 = d3 = 7 - 12 mm, and D1 / D2 = 1 / 2 - 2 / 3. The decompression and noise reduction device for the air inlet end of the equipment with such structural dimensions can achieve better noise reduction effects, and at the same time, the air flow velocity in the sound absorption unit chamber 111 provided with the protrusion 14 changes significantly, realizing that the flow rate of the air inlet 12 is basically equal to that of the air outlet 13, and basically not affecting the flow rate to generate too large fluctuations.

[0034] It should be noted that the base of the protrusion 14 refers to the part where the protrusion 14 is connected to the side wall of the sound absorption unit chamber 111, and the end of the protrusion 14 refers to the end of the protrusion 14 far from the connection with the side wall of the sound absorption unit chamber 111. The end of the protrusion 14 is arc-shaped, and the base of the protrusion 14 is smoothly transitioned with the side wall of the sound absorption unit chamber 111.

[0035] In addition, as Figure 4 shown, the present invention also provides an oxygen-enriched generator, which includes a pressure chamber, a booster solenoid valve 4, and the above-mentioned decompression and noise reduction device for the air inlet end of the equipment. The air inlet 12 is communicated with the booster solenoid valve 4 through an air inlet pipe 5, and the air outlet 13 is communicated with the pressure chamber.

[0036] When the booster solenoid valve 4 is opened, high-pressure gas enters the decompression and noise reduction device for the air inlet end of the equipment through the booster solenoid valve 4. When passing through the sound absorption cotton 3 in each sound absorption unit chamber 111 and the sound absorption holes 21 on the partition plate 2, the air flow noise gradually decreases and enters the pressure chamber through the air outlet 13. The oxygen-enriched generator has a good sound insulation effect, which helps to improve the comfort of users when using the micro-pressure oxygen-enriched chamber.

[0037] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A pressure reducing and noise reducing device for the air inlet end of an equipment, characterized in that: The invention comprises a shell, wherein the shell is provided with a silencer chamber, an air inlet and an air outlet, wherein the air inlet and the air outlet are respectively arranged at two ends of the silencer chamber, and the silencer chamber is divided into a plurality of silencer unit chambers by a partition plate located between the air inlet and the air outlet, wherein the partition plate is provided with a silencer hole connecting two adjacent silencer unit chambers, and at least one silencer unit chamber is provided with a protrusion between two adjacent partition plates, and the protrusion extends along a direction intersecting with the axial direction of the air inlet.

2. The decompression and noise reduction device for the air inlet end of the equipment according to claim 1, characterized in that: The silencing cavity is provided with silencing cotton.

3. The decompression and noise reduction device for the air inlet end of the equipment according to claim 2, characterized in that: The sound-absorbing cotton is filled between two adjacent partitions, or each of the sound-absorbing unit chambers is filled with the sound-absorbing cotton.

4. The decompression and noise reduction device for the air inlet end of the equipment according to claim 2, characterized in that: The sound-absorbing cotton is squeezed and deformed by the protrusion.

5. The pressure reducing and noise reducing device for the air inlet end of the equipment according to any one of claims 2 to 4, characterized in that: The protrusions are arranged on opposite sides of the muffler unit chamber, or are arranged around the circumference of the muffler unit chamber.

6. The decompression and noise reduction device for the air inlet end of the equipment according to claim 5, characterized in that: The protrusions are symmetrically arranged on both sides of the muffler unit chamber.

7. The decompression and noise reduction device for the air inlet end of the equipment according to claim 6, characterized in that: The air inlet is coaxially arranged with the air outlet.

8. The decompression and noise reduction device for the air inlet end of the equipment according to claim 1 or 7, characterized in that: The aperture of the silencer hole is d1, the aperture of the air inlet is d2, the aperture of the air outlet is d3, the axial distance between the end of the protrusion and the air inlet is D1, and the axial distance between the base of the protrusion and the air inlet is D2, wherein d=0.8~1.2mm, d2=d3=7~12mm, and D1 / D2=1 / 2~2 / 3.

9. The decompression and noise reduction device for the air inlet end of the equipment according to claim 1, characterized in that: The housing comprises a cover body and a bottom shell. The bottom shell is provided with a sealing groove surrounding the muffler cavity. A sealing ring is provided in the sealing groove. The sealing ring abuts against the cover body.

10. An oxygen-enriched generator, characterized in that: It comprises a pressure chamber, a boost solenoid valve and a pressure reducing and noise reducing device for the air inlet end of the equipment as described in any one of claims 1 to 9, wherein the air inlet is connected to the boost solenoid valve, and the air outlet is connected to the pressure chamber.

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