Pressure and noise reduction device and oxygen-enriched generator

Abstract

The utility model relates to the technical field of medical care equipment, and discloses a pressure reduction and noise reduction device and an oxygen enrichment generator, the pressure reduction and noise reduction device comprises a shell and a silencing pipe, the shell is provided with a silencing cavity, an air inlet hole and a first exhaust hole, the air inlet hole and the first exhaust hole are communicated with the silencing cavity, and the silencing pipe is arranged in the silencing cavity; the silencing pipe comprises a first pipe section and a second pipe section, one end of the first pipe section is used for being communicated with an air source, the other end of the first pipe section is communicated with the second pipe section, the cross section area of the second pipe section is larger than that of the first pipe section, and the end, away from the air inlet hole, of the second pipe section is arranged in a sealed mode. And the second pipe section is provided with a second exhaust hole communicated with the silencing cavity. The pressure reduction and noise reduction device can effectively reduce exhaust noise in the pressure reduction process.

Description

Technical Field

[0001] The utility model relates to the technical field of medical care equipment, in particular to a pressure reducing and noise reducing device and an oxygen enrichment generator. Background Art

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

[0003] Among them, the equipment composition of the oxygen-enriched generator mainly includes a pressurization system and an oxygen production system. When the oxygen-enriched generator is turned on, the pressurization system starts working first, and the pressure in the cabin increases. When it reaches the set pressure, the pressurization system and the oxygen production system work together to form an oxygen-enriched environment in the cabin. When the pressure in the cabin is higher than the set pressure, the solenoid valve that controls the pressure relief will open, and the air in the cabin will be discharged to the outside of the cabin. When the pressure in the cabin drops to the set pressure, the solenoid valve closes.

[0004] When the solenoid valve of the existing micro-pressure oxygen-enriched cabin is opened to relieve the pressure of the cabin, the exhaust noise generated is relatively large, which affects the user experience. Therefore, it is necessary to provide a decompression and noise reduction device to effectively reduce the cabin exhaust noise. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a decompression and noise reduction device to effectively reduce the exhaust noise during the decompression process.

[0006] In order to solve the above technical problems, the utility model provides a pressure reduction and noise reduction device, including a shell and a silencer pipe, the shell is provided with a silencer chamber, and an air inlet and a first exhaust hole connected to the silencer chamber, the silencer pipe is arranged in the silencer chamber, the silencer pipe includes a first pipe section and a second pipe section, one end of the first pipe section is used to connect with an air source, and the other end is connected with the second pipe section, the cross-sectional area of ​​the second pipe section is larger than the cross-sectional area of ​​the first pipe section, the second pipe section is sealed at one end away from the air inlet, and the second pipe section is provided with a second exhaust hole connected to the silencer chamber.

[0007] As an improvement of the above solution, a sound-absorbing layer is provided on the cavity wall of the sound-absorbing cavity.

[0008] As an improvement of the above solution, the ratio of the cross-sectional area of ​​the first pipe segment to the cross-sectional area of ​​the second pipe segment is 1 / 20 to 1 / 4.

[0009] As an improvement of the above solution, the ratio of the cross-sectional area of ​​the second pipe section to the cross-sectional area of ​​the muffler chamber is 1 / 20 to 1 / 4.

[0010] As an improvement of the above solution, in the axial direction of the silencer pipe, the length of the silencer pipe is 1 / 2 of the length of the silencer chamber, and the ratio of the length of the first pipe section to the length of the second pipe section is 1 / 3 to 1 / 1.5.

[0011] As an improvement of the above solution, the cross-sectional areas of the second pipe segment are equal at various locations, and the distances between the circumferential outer wall of the second pipe segment and the muffler cavity are equal.

[0012] As an improvement of the above solution, the second exhaust hole is arranged along the radial extension of the second pipe section.

[0013] As an improvement of the above solution, the silencer pipe is coaxially arranged with the first exhaust hole.

[0014] As an improvement of the above solution, the sound-absorbing layer is arranged on the side wall of the sound-absorbing cavity which circumferentially surrounds the first pipe section.

[0015] In addition, the utility model also provides an oxygen-enriched generator, which includes a pressure chamber, a pressure relief valve and the above-mentioned pressure reduction and noise reduction device, the inlet of the pressure relief valve is connected to the pressure chamber, and the outlet of the pressure relief valve is connected to the first pipe section of the shell.

[0016] The implementation of this utility model has the following beneficial effects:

[0017] The utility model discloses a pressure reducing and noise reducing device, which provides a silencer pipe in a silencer cavity, wherein the silencer pipe comprises a first pipe section and a second pipe section, wherein the cross-sectional area of ​​the second pipe section is larger than that of the first pipe section, the second pipe section is sealed at one end away from the air inlet, and the second pipe section is provided with a second exhaust hole connected to the silencer cavity, so that a gas with a relatively high pressure enters the second pipe section with a larger cross-sectional area through the first pipe section connected to the air inlet, enters the silencer cavity from the second exhaust hole of the second pipe section, and is discharged from a shell body through the first exhaust hole; the gas source enters the second pipe section with a larger cross-sectional area from the first pipe section with a smaller cross-sectional area, thereby helping to reduce the axial flow velocity of the gas and realizing primary noise reduction; when entering the silencer cavity with a larger cross-sectional area through the second exhaust hole, the flow direction changes, and the flow velocity is further reduced, realizing secondary noise reduction; thus, the pressure reducing and noise reducing device with this structure greatly reduces the exhaust noise during the pressure reducing process of the gas source. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a pressure reducing and noise reducing device of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the pressure reducing and noise reducing device through the center axis of the silencer pipe;

[0020] Figure 3The utility model is a schematic structural diagram of an oxygen-enriched generator according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 As shown, the utility model discloses an embodiment of a pressure reducing and noise reducing device, comprising a shell 1 and a silencer pipe 2, wherein the shell 1 is provided with a silencer chamber 11, and the silencer chamber 11 is communicated with the outside of the shell 1 through an air inlet 12 and a first exhaust hole 13. The silencer pipe 2 is arranged in the silencer chamber 11, and comprises a first pipe section 21 and a second pipe section 22, wherein one end of the first pipe section 21 is used to communicate with an air source, and the other end is communicated with the second pipe section 22, and the cross-sectional area of ​​the second pipe section 22 is larger than the cross-sectional area of ​​the first pipe section 21, and the second pipe section 22 is sealed at one end away from the air inlet 12, and the second pipe section 22 is provided with a second exhaust hole 221 communicated with the silencer chamber 11.

[0023] In this embodiment, a silencer pipe 2 is arranged in the silencer chamber 11, and the silencer pipe 2 includes a first pipe section 21 and a second pipe section 22. The cross-sectional area of ​​the second pipe section 22 is larger than that of the first pipe section 21. The second pipe section 22 is sealed at one end away from the air inlet 12, and the second pipe section 22 is provided with a second exhaust hole 221 connected to the silencer chamber 11. A gas with a relatively high pressure enters the second pipe section 22 with a larger cross-sectional area through the first pipe section 21 connected to the air inlet 12, and enters the silencer chamber 11 from the second exhaust hole 221 of the second pipe section 22, and is discharged from the shell 1 through the first exhaust hole 13; the gas source enters the second pipe section 22 with a larger cross-sectional area from the first pipe section 21 with a smaller cross-sectional area, which helps to reduce the axial flow velocity of the gas and realizes the first-level noise reduction; when entering the silencer chamber 11 with a larger cross-sectional area through the second exhaust hole 221, the flow direction changes, and the flow velocity is further reduced, realizing the second-level noise reduction; thus, the pressure reducing and noise reducing device of this structure greatly reduces the exhaust noise during the pressure reducing process of the gas source.

[0024] The shell 1 includes a cover 1a and a bottom shell 1b. The silencer chamber 11 is connected to the outside of the shell 1 only through the air inlet 12 and the first exhaust hole 13 on the bottom shell 1b. The first pipe section 21 of the silencer pipe 2 is used to introduce the air source, which is connected to the air inlet 12. The first pipe section 21 can be connected to the air inlet 12, or the first pipe section 21 can be directly sealed and penetrated in the air inlet 12. The second exhaust holes 221 on the silencer pipe 2 are arranged on the side wall of the second pipe section 22, and the second exhaust holes 221 are arrayed in multiple groups along the axial direction of the second pipe section 22. The multiple groups of second exhaust holes 221 are arranged in a circumferential array along the second pipe section 22, so that the airflow entering the second pipe section 22 is dispersed and discharged in the circumferential direction of the second pipe section 22.

[0025] Preferably, in this embodiment, a sound-absorbing layer 3 is provided on the inner wall of the silencing chamber 11, and the sound-absorbing layer 3 can be sound-insulating cotton or sound-absorbing cotton, preferably sound-insulating cotton. Among them, the sound-insulating cotton is mainly made of soft fiber or polycarbonate board, which is a high-density material without holes on the surface, and the sound-absorbing cotton is a porous inorganic material with sound absorption and noise reduction functions. The gas discharged into the silencing chamber 11 through the silencing pipe 2 is reduced by the rebound of the sound-insulating cotton, thereby achieving three-level noise reduction.

[0026] In order to significantly change the air flow velocity in the silencer pipe 2 and the silencer chamber 11 and achieve a better noise reduction effect, the ratio of the cross-sectional area of ​​the first pipe section 21 to the cross-sectional area of ​​the second pipe section 22 in this embodiment is preferably 1 / 20~1 / 4, and the ratio of the cross-sectional area of ​​the second pipe section 22 to the cross-sectional area of ​​the silencer chamber 11 is preferably 1 / 20~1 / 4.

[0027] Correspondingly, in the axial direction of the silencer pipe 2, the length of the silencer pipe 2 is 1 / 2 of the length of the silencer chamber 11, and the ratio of the length of the first pipe section 21 to the length of the second pipe section 22 is 1 / 3 to 1 / 1.5.

[0028] In this embodiment, the silencer pipe 2 is coaxially arranged with the air inlet 12 and the first exhaust hole 13, and the cross-sectional areas of the second pipe section 22 are set to be equal at all locations, and the distance between the outer wall of the second pipe section 22 in the circumferential direction and the silencer cavity 11 is set to be equal. The second exhaust hole 221 is arranged to extend radially along the second pipe section 22, and the silencer layer 3 is preferably arranged on the side wall of the silencer cavity 11 that surrounds the first pipe section 21 in the circumferential direction. The airflow discharged from the second exhaust hole 221 flows evenly to the outer periphery of the second pipe section 22, and the noise is reduced by the rebound of the sound insulation cotton.

[0029] In addition, combined Figure 3 The utility model also provides an oxygen-enriched generator, which includes a pressure chamber, a pressure relief valve 4 and the above-mentioned pressure reduction and noise reduction device, the inlet of the pressure relief valve 4 is connected to the pressure chamber, and the outlet of the pressure relief valve 4 is connected to the first pipe section 21 of the shell 1 through the air inlet pipe 5.

[0030] When the pressure relief valve 4 is opened, the gas in the pressure cabin flows into the silencer pipe 2 through the air inlet 12 of the pressure reduction and noise reduction device, and the air source enters the second pipe section 22 with a larger cross-sectional area from the first pipe section 21 with a smaller cross-sectional area, helping to reduce the axial flow velocity of the gas and achieve primary noise reduction; when the airflow flows through the second exhaust hole 221 of the silencer pipe 2 to the silencer chamber 11 with a larger cross-sectional area, the flow direction changes, and the flow velocity is further reduced, achieving secondary noise reduction; the gas discharged into the silencer chamber 11 through the silencer pipe 2 is reduced in noise by the rebound of the sound insulation cotton, achieving third-level noise reduction; the airflow is finally discharged from the first exhaust hole 13 of the shell 1, with a good silencing effect, which helps to improve the user's experience comfort when using the micro-pressure oxygen-enriched cabin.

[0031] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A pressure reducing and noise reducing device, characterized in that: The utility model comprises a shell and a silencer pipe, wherein the shell is provided with a silencer chamber, and an air inlet hole and a first exhaust hole connected with the silencer chamber, the silencer pipe is arranged in the silencer chamber, the silencer pipe comprises a first pipe section and a second pipe section, one end of the first pipe section is used to be connected with an air source, and the other end is connected with the second pipe section, the cross-sectional area of ​​the second pipe section is larger than the cross-sectional area of ​​the first pipe section, the second pipe section is sealed at one end away from the air inlet hole, and the second pipe section is provided with a second exhaust hole connected with the silencer chamber.

2. The pressure reducing and noise reducing device according to claim 1, characterized in that: The cavity wall of the silencing cavity is provided with a silencing layer.

3. The pressure reducing and noise reducing device according to claim 1, characterized in that: The ratio of the cross-sectional area of ​​the first pipe section to the cross-sectional area of ​​the second pipe section is 1 / 20 to 1 / 4.

4. The pressure reducing and noise reducing device according to claim 1 or 3, characterized in that: The ratio of the cross-sectional area of ​​the second pipe section to the cross-sectional area of ​​the muffler chamber is 1 / 20 to 1 / 4.

5. The pressure reducing and noise reducing device according to claim 1, characterized in that: In the axial direction of the silencer pipe, the length of the silencer pipe is 1 / 2 of the length of the silencer chamber, and the ratio of the length of the first pipe section to the length of the second pipe section is 1 / 3 to 1 / 1.

5.

6. The pressure reducing and noise reducing device according to claim 1, characterized in that: The cross-sectional areas of the second pipe section are equal at all locations, and the distances between the circumferential outer wall of the second pipe section and the muffler cavity are equal.

7. The pressure reducing and noise reducing device according to claim 1, characterized in that: The second exhaust hole is arranged to extend along the radial direction of the second pipe section.

8. The pressure reducing and noise reducing device according to claim 1, characterized in that: The silencer pipe is coaxially arranged with the first exhaust hole.

9. The pressure reducing and noise reducing device according to claim 2, characterized in that: The sound-absorbing layer is arranged on the side wall of the sound-absorbing cavity surrounding the first pipe section in the circumferential direction.

10. An oxygen-enriched generator, characterized in that: It comprises a pressure chamber, a pressure relief valve and the pressure reduction and noise reduction device according to any one of claims 2 to 9, wherein the inlet of the pressure relief valve is connected to the pressure chamber, and the outlet of the pressure relief valve is connected to the first pipe section of the shell.

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