Nitrogen-discharging and noise-eliminating device of oxygen generator

Abstract

The oxygenerator comprises a compressor cover, the interior of the compressor cover is a compressor installation space, a nitrogen discharge bin is arranged on the compressor cover, a nitrogen discharge pipe is arranged on the nitrogen discharge bin, the nitrogen discharge pipe is communicated with an inner cavity of the nitrogen discharge bin, and the inner cavity of the nitrogen discharge bin is provided with a water inlet and a water outlet. A plurality of through holes are formed in the side wall of the nitrogen discharging bin, and an inner cavity of the nitrogen discharging bin communicates with the compressor installation space through the through holes. The nitrogen removal bin is simple in structure and good in noise elimination effect; the device can be suitable for various complex working conditions such as high temperature, moisture and high-speed airflow, and is good in applicability.

Description

Technical Field

[0001] The utility model relates to a nitrogen exhaust silencing device for an oxygen generator, belonging to the technical field of nitrogen exhaust silencing for oxygen generators. Background Art

[0002] Existing oxygen generators mainly use the principle of pressure swing adsorption technology to produce oxygen. When this solution produces oxygen, nitrogen with a relatively high pressure will accumulate inside the molecular sieve, and the nitrogen in the molecular sieve needs to be discharged from the molecular sieve periodically.

[0003] When the nitrogen at a higher pressure in the molecular sieve is discharged, the sudden pressure drop will cause a larger airflow impact noise.

[0004] Common types of silencers are resistive, reactive and composite, and the commonly used silencers in the field of oxygen concentrators are resistive silencers. The Chinese invention patent application with publication number CN117198256A discloses a silencer that uses resistive materials to absorb sound energy and reduce noise. Although this solution has a wide range of silencers, the silencer performance is related to the material properties and effective amount of the resistive material. The designed silencer size is large, and when the exhaust nitrogen temperature is high and contains water vapor, the silencer performance of the resistive material will be reduced. Utility Model Content

[0005] The utility model provides a nitrogen exhaust silencer for an oxygen concentrator, which has a simple structure and strong adaptability and can be used in various complex nitrogen exhaust working conditions such as high temperature, humidity, and high-speed airflow. The specific technical scheme is as follows.

[0006] A nitrogen exhaust silencer for an oxygen concentrator, the oxygen concentrator comprising a compressor cover, the interior of the compressor cover being a compressor installation space, characterized in that:

[0007] The compressor cover is provided with a nitrogen exhaust bin, and the nitrogen exhaust bin is provided with a nitrogen exhaust pipe, one end of the nitrogen exhaust pipe is connected with the inner cavity of the nitrogen exhaust bin, and the other end is connected with the molecular sieve, and a plurality of through holes are provided on the side wall of the nitrogen exhaust bin, and the through holes connect the inner cavity of the nitrogen exhaust bin and the compressor installation space.

[0008] With the above technical solution, when the oxygen generator runs to the nitrogen exhaust cycle, the high-pressure nitrogen in the molecular sieve enters the inner cavity of the nitrogen exhaust bin from the nitrogen exhaust pipe. The inner cavity of the nitrogen exhaust bin is a cavity with a certain volume, which buffers and decompresses the nitrogen, reduces the flow rate, and achieves the effect of reducing the nitrogen exhaust noise. The nitrogen in the inner cavity of the nitrogen exhaust bin is then discharged into the compressor installation space through a number of through holes, and is discharged to the outside of the oxygen generator together with the air used to cool the compressor.

[0009] Furthermore, the oxygen concentrator further includes a cooling fan, and an air inlet is provided between the cooling fan and the compressor installation space; the oxygen concentrator further includes an exhaust port; the air inlet, the compressor installation space and the exhaust port together constitute a heat dissipation channel. When the cooling fan is working, the air outside the oxygen concentrator passes through the cooling fan, the air inlet, the compressor installation space and the exhaust port in sequence, thereby cooling the compressor, and at the same time, the nitrogen discharged into the compressor installation space can be discharged together, thereby achieving the purpose of quickly discharging nitrogen and reducing the concentration of the discharged nitrogen, and also helps to prevent the discharged nitrogen from being re-absorbed by the compressor to participate in the pressure swing adsorption oxygen production cycle to reduce the oxygen production concentration.

[0010] Furthermore, the nitrogen exhaust bin includes a bin body and a cover body fixed on the bin body, and the nitrogen exhaust pipe is arranged on the cover body. Preferably, a portion of the nitrogen exhaust pipe protrudes from the cover body and extends into the inner cavity of the nitrogen exhaust bin. During manufacturing and installation, the nitrogen exhaust pipe is first fixed to the cover body, and then the cover body is fixed to the bin body. The length of the protruding portion of the nitrogen exhaust pipe is selected according to needs, and the noise of the corresponding frequency can be eliminated.

[0011] Furthermore, the apertures at both ends of the through hole are gradually enlarged. That is, both ends of the through hole are in the form of trumpet-shaped openings, which helps the airflow to fully diffuse after being discharged and reduces the nitrogen exhaust noise.

[0012] Furthermore, a sound-absorbing material is arranged on the inner wall of the nitrogen exhaust bin, and the sound-absorbing material is preferably polyurethane acoustic foam or glass wool. The sound-absorbing material is arranged on the inner wall of the nitrogen exhaust bin to further reduce the noise of nitrogen exhaust.

[0013] The nitrogen exhaust bin of the utility model has a simple structure and good noise reduction effect; it can be applied to various complex working conditions such as high temperature, humidity, high-speed airflow, etc., and has good applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a vertical cross-sectional schematic diagram of the oxygen concentrator of the utility model (the arrow in the figure indicates the direction of gas flow);

[0015] Figure 2 It is a horizontal cross-sectional schematic diagram of the oxygen concentrator of the utility model;

[0016] Figure 3 It is a partial cross-sectional schematic diagram of the oxygen concentrator of the utility model (the arrow in the figure indicates the direction of gas flow);

[0017] Figure 4 It is a schematic diagram of the nitrogen exhaust bin and the compressor cover;

[0018] Figure 5 is a partial cross-sectional schematic diagram of a compressor cover;

[0019] Figure 6 yes Figure 5 A magnified image of area A;

[0020] Figure 7 is a schematic vertical cross-sectional view of a compressor cover;

[0021] Figure 8 yes Figure 7 A magnified view of the first example of region B;

[0022] Fig. 9 yes Figure 7 A magnified view of the second example of area B.

[0023] In the figure: 1 - oxygen generator housing, 1.1 - compressor installation space, 1.1.1 - air inlet, 1.1.2 - exhaust port, 2 - compressor cover, 3 - compressor, 4 - nitrogen exhaust bin, 4.1 - bin body, 4.2 - cover body, 4.3 - inner cavity, 4.4 - nitrogen exhaust pipe, 4.4.1 - protrusion, 4.5 - through hole, 5 - cooling fan. DETAILED DESCRIPTION

[0024] The utility model is described in further detail below in conjunction with the accompanying drawings.

[0025] See also Figure 1-Figure 9 The oxygen concentrator of the utility model includes an oxygen concentrator housing 1 and a compressor cover 2. The compressor cover 2 is mounted on the oxygen concentrator housing 1. The interior of the compressor cover 2 forms a compressor installation space 1.1. The compressor 3 is installed in the compressor installation space 1.1. In this embodiment, the compressor cover 2 and part of the oxygen concentrator housing 1 together form the compressor installation space 1.1, that is, in fact, part of the oxygen concentrator housing can also be regarded as a compressor cover; those skilled in the art can understand that the compressor cover 2 can be a complete and relatively closed cover body, so that the entire compressor is located inside the independent compressor cover 2.

[0026] The oxygen concentrator further includes a cooling fan 5, and an air inlet 1.1.1 is provided between the cooling fan 5 and the compressor installation space 1.1; the oxygen concentrator further includes an exhaust port 1.1.2; the air inlet 1.1.1, the compressor installation space 1.1 and the exhaust port 1.1.2 together constitute a heat dissipation channel. The fan airflow is blown out of the oxygen concentrator from the air inlet 1.1.1 through the compressor installation space 1.1 and the exhaust port 1.1.2.

[0027] The nitrogen exhaust bin 4 is located on the compressor cover 2, and the nitrogen exhaust bin 4 includes a bin body 4.1 and a cover body 4.2, and the bin body 4.1 and the cover body 4.2 are fastened by ultrasonic welding to form an inner cavity 4.3 of the nitrogen exhaust bin 4. In different embodiments, the bin body 4.1 and the cover body 4.2 can also be fastened by screws or adhesives to form an internal inner cavity 4.3. A plurality of through holes 4.5 are provided on the side wall of the nitrogen exhaust bin 4 (bin body 4.1), and the through holes 4.5 connect the inner cavity 4.3 of the nitrogen exhaust bin 4 with the compressor installation space 1.1. Among them, the bin body 4.1 is preferably integrally formed with the compressor cover 2, and part of the side wall of the bin body 4.1 is also used as a part of the compressor cover 2.

[0028] A nitrogen exhaust pipe 4.4 is provided on the cover body 4.2, one end of the nitrogen exhaust pipe 4.4 is connected to the inner cavity 4.3 of the nitrogen exhaust bin 4, and the other end is connected to the molecular sieve (not shown). The nitrogen enriched in the molecular sieve is blown into the inner cavity 4.3 of the nitrogen exhaust bin 4 through the nitrogen exhaust pipe 4.4. The inner cavity 4.3 is a cavity with a certain volume, which can initially decompress the high-pressure gas flow containing nitrogen and reduce the flow rate of the gas flow, so that the sudden pressure discharge at the original exhaust port is changed to a gradual discharge through the nitrogen exhaust bin 4, so as to reduce the nitrogen exhaust noise.

[0029] A portion of the nitrogen exhaust pipe 4.4 protrudes from the cover 4.2 and extends into the inner cavity 4.3 of the nitrogen exhaust bin 4. The protruding portion 4.4.1 has a certain length. Protruding portions 4.4.1 of different lengths can eliminate noise of corresponding frequencies.

[0030] The diameter and number of the through holes 4.5 are related to the capacity of nitrogen in the molecular sieve, the pressure of nitrogen and the nitrogen exhaust time. Specifically, in this embodiment, the molecular sieve used has a capacity of about 0.0004 m 3 , the nitrogen pressure in the molecular sieve is about 140 kPa, the nitrogen discharge time is about 6 seconds, and the corresponding micropores 4.5 have a diameter of about 0.8 mm and a number of about 30. In other embodiments, if the capacity of the molecular sieve is increased to 0.002 m 3 The pressure of nitrogen in the molecular sieve is about 140kPa, the nitrogen exhaust time is about 6s, and the corresponding micropore diameter increases to 1mm, with a number of about 100.

[0031] Preferably, if Figure 7-Figure 8 As shown, the diameter of the through hole 4.5 at one end (outer end) close to the compressor installation space 1.1 is gradually increased. In other words, the outer end of the through hole is in the form of a trumpet-shaped opening, which helps the airflow to fully diffuse after being discharged and reduces the nitrogen exhaust noise. Figure 7 , Fig. 9 As shown, of course, the end (inner end) of the through hole 4.5 close to the inner cavity 4.3 is also in a gradually enlarged form (trumpet-shaped opening form), which helps to guide the smooth transition of the nitrogen flow and reduce noise.

[0032] In different implementations, a sound-absorbing material (not shown) is provided on the inner wall of the nitrogen exhaust bin 4, and the sound-absorbing material is preferably polyurethane acoustic foam or glass wool. The sound-absorbing material is provided on the inner wall of the nitrogen exhaust bin 4 to further reduce the noise of nitrogen exhaust.

[0033] When the oxygen generator runs to the nitrogen exhaust cycle, the high-pressure nitrogen in the molecular sieve enters the inner cavity 4.3 from the nitrogen exhaust pipe 4.4. The inner cavity 4.3 is a cavity with a certain volume, which buffers and decompresses the nitrogen and reduces the flow rate. The nitrogen in the inner cavity 4.3 is then discharged into the compressor installation space 1.1 through the through hole 4.5, and is discharged to the outside of the oxygen generator together with the air used to cool the compressor. The nitrogen exhaust bin 4 changes the pressure of the exhaust port from a sudden change directly discharged to the air to a gradual change through the nitrogen exhaust bin 4, thereby achieving the effect of reducing the nitrogen exhaust noise.

[0034] The embodiments of the utility model are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments of the utility model and the features in the embodiments can be combined with each other. The utility model is not limited to the above-mentioned specific implementation methods, which are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all belong to the protection scope of the utility model.

Claims

1. A nitrogen exhaust silencer for an oxygen concentrator, the oxygen concentrator comprising a compressor cover (2), the interior of the compressor cover (2) being a compressor installation space (1.1), Features: The compressor cover (2) is provided with a nitrogen exhaust bin (4), the nitrogen exhaust bin (4) is provided with a nitrogen exhaust pipe (4.4), the nitrogen exhaust pipe (4.4) is connected with the inner cavity (4.3) of the nitrogen exhaust bin (4), and a plurality of through holes (4.5) are provided on the side wall of the nitrogen exhaust bin (4), and the through holes (4.5) connect the inner cavity (4.3) of the nitrogen exhaust bin (4) and the compressor installation space (1.1).

2. The nitrogen exhaust silencer of an oxygen concentrator according to claim 1, It is characterized in that The oxygen concentrator further comprises a heat dissipation fan (5), and an air inlet (1.1.1) is arranged between the heat dissipation fan (5) and the compressor installation space (1.1); the oxygen concentrator further comprises an exhaust port (1.1.2); the air inlet (1.1.1), the compressor installation space (1.1) and the exhaust port (1.1.2) together constitute a heat dissipation channel.

3. The nitrogen exhaust silencer of an oxygen concentrator according to claim 1, It is characterized in that The nitrogen exhaust bin (4) comprises a bin body (4.1) and a cover body (4.2) fixed on the bin body (4.1), and the nitrogen exhaust pipe (4.4) is arranged on the cover body (4.2).

4. The nitrogen exhaust silencer of an oxygen concentrator according to claim 3, It is characterized in that A portion of the nitrogen exhaust pipe (4.4) protrudes from the cover body (4.2) and extends into the inner cavity (4.3) of the nitrogen exhaust bin (4).

5. The nitrogen exhaust silencer of an oxygen generator according to claim 1, It is characterized in that The apertures at both ends of the through hole (4.5) are gradually increasing.

6. The nitrogen exhaust silencer of an oxygen concentrator according to claim 1, It is characterized in that The diameter of the through hole (4.5) at one end close to the compressor installation space (1.1) is in a gradually increasing form.

7. The nitrogen exhaust silencer of an oxygen concentrator according to claim 1, It is characterized in that A sound-absorbing material is provided on the inner wall of the nitrogen exhaust bin (4).

8. The nitrogen exhaust silencer of an oxygen concentrator according to claim 7, It is characterized in that The sound-absorbing material is preferably polyurethane acoustic foam or glass wool.

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