Nitrogen removal and noise reduction structure

Abstract

The utility model relates to the technical field of oxygen generators, in particular to a nitrogen removal and noise reduction structure, which comprises a box body, an air outlet channel and a noise reduction device, and is characterized in that the bottom surface of the box body is provided with an air outlet channel; the cover plate is arranged on the box body in a covering mode, and an air inlet channel is formed in the cover plate; the partition plate is arranged in the box body and divides the box body into a plurality of cavities, silencing cotton is arranged in the cavities, when the box body is covered with the cover plate, the bottom face of the cover plate makes contact with the tops of the partition plate and is sealed, the partition plate is provided with a plurality of air holes, the cavities are communicated through the air holes, and airflow flows through the cavities through the air inlet channel and then flows out of the air outlet channel. Air flow passes through the air inlet cavity, the circulating air cavity and the air outlet cavity, so that the air flow forms a loop, the time for the air flow to flow through the silencing cotton is prolonged, the noise during nitrogen removal is reduced, the adjacent air holes are arranged in a staggered mode, the air flow forms a reciprocating spiral structure, the flowing path of the air flow is longest, and the silencing effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oxygen generators, and particularly relates to a nitrogen discharge and noise reduction structure. Background Art

[0002] At present, most of the existing oxygen generators on the market adopt a single noise reduction means for nitrogen discharge, such as installing simple sound-absorbing cotton or mufflers. Although these methods can reduce noise to a certain extent, they often have problems such as limited noise reduction effect, complex structure, and inconvenient maintenance. Especially during the high-pressure nitrogen discharge process, a single noise reduction means is often difficult to achieve the ideal noise reduction effect. In current oxygen generators, after the compressor inhales air, it needs to pass through a molecular sieve barrel to adsorb nitrogen and then discharge it. At its outlet, due to the sudden expansion of volume, a particularly high-decibel noise will be generated. Therefore, a noise reduction nitrogen discharge box component structure is usually designed inside the oxygen generator to relieve the pressure and volume of the discharged air and achieve the purpose of reducing the noise during nitrogen discharge.

[0003] Therefore, this application develops a nitrogen discharge and noise reduction structure to solve the problems existing in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a nitrogen discharge and noise reduction structure to solve the problem that a high-decibel noise is generated at the outlet of the oxygen generator due to volume expansion in the prior art.

[0005] The technical solution of the utility model is: a nitrogen discharge and noise reduction structure, including:

[0006] A box body, the bottom surface of the box body is provided with an air outlet channel;

[0007] A cover plate, covering the box body, and the cover plate is provided with an air inlet channel;

[0008] A partition plate, arranged inside the box body, separating the box body into multiple chambers, and sound-absorbing cotton is provided in each of the multiple chambers. When the cover plate covers the box body, the bottom surface of the cover plate contacts and seals the top of the partition plate, and a plurality of air holes are opened on the partition plate to communicate the multiple chambers, so that the air flow passes through the multiple chambers through the air inlet channel and then flows out from the air outlet channel.

[0009] Preferably, the chambers include an air inlet chamber, an air outlet chamber, and a circulating air chamber. The air inlet chamber is communicated with the air inlet channel, the air outlet chamber is communicated with the air outlet channel, and the circulating air chamber is communicated with the air inlet chamber and the air outlet chamber respectively through the air holes, so that the air flow sequentially passes through the air inlet chamber, the circulating air chamber, and the air outlet chamber.

[0010] Preferably, at least one partition plate is provided in the circulating air chamber, and corresponding air holes are provided on the partition plate to enable the air flow in the circulating air chamber to circulate.

[0011] Preferably, along the direction of the airflow movement, two adjacent ones of the air holes are arranged in a staggered manner, so that the airflow passing through the adjacent air holes forms a reciprocating spiral structure.

[0012] Preferably, the air hole is of a U-shaped structure, and the height of the air hole is greater than half of the height of the partition plate.

[0013] Preferably, a stepped surface is provided at the inner edge of the box body, and the top of the partition plate is on the same horizontal plane as the stepped surface, so that when the cover plate is covered on the box body, the bottom surface of the cover plate coincides with the top of the partition plate and the stepped surface.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] (1) The airflow passes through the air inlet cavity, the circulating air cavity and the air outlet cavity, so that the airflow forms a loop to increase the time for the airflow to flow through the sound-absorbing cotton, thereby reducing the noise during nitrogen discharge;

[0016] (2) The adjacent air holes are arranged in a staggered manner, so that the airflow forms a reciprocating spiral structure, making the path of the airflow the longest and increasing the sound-absorbing effect. Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0018] Figure 1 is an exploded schematic view of a nitrogen discharge sound-absorbing structure according to the present utility model;

[0019] Figure 2 is an exploded schematic view of a nitrogen discharge sound-absorbing structure according to the present utility model;

[0020] Figure 3 is a schematic structural view of the box body according to the present utility model;

[0021] Figure 4 is a schematic structural view of a nitrogen discharge sound-absorbing structure according to the present utility model.

[0022] Wherein: 1. Box body; 11. Air outlet channel; 2. Cover plate; 21. Air inlet channel; 3. Partition plate; 4. Chamber; 41. Air inlet chamber; 42. Air outlet chamber; 43. Circulating air chamber; 5. Sound-absorbing cotton; 6. Air hole; 7. Stepped surface. Detailed Embodiments

[0023] The content of the present utility model will be further described in detail below in conjunction with specific embodiments:

[0024] Such as Figures 1-4As shown in the figure, a nitrogen discharge and noise reduction structure includes a box body 1, a cover plate 2, and a partition plate 3. The bottom surface of the box body 1 is connected with an air outlet channel 11 for discharging gas, the top of the cover plate 2 is connected with an air inlet channel 21 for introducing gas, the partition plate 3 is arranged in the box body 1 to divide the box body 1 into multiple chambers 4, and sound-absorbing cotton 5 is installed in the multiple chambers 4. The partition plate 3 is also provided with air holes 6 to connect the multiple chambers 4. After the gas enters the box body 1 through the air inlet channel 21, the air flow will first enter the chamber 4 and pass through the multiple chambers 4 through the air holes 6 and finally flow out from the air outlet channel 11. By increasing the flow time of the air flow and the retention time in the chamber 4, the contact time with the sound-absorbing cotton 5 is increased, thereby reducing the noise of the air flow.

[0025] In this embodiment, as Figure 2 shown, the chamber 4 includes an air inlet chamber 41, an air outlet chamber 42, and a circulating air chamber 43. Among them, the air inlet chamber 41 is connected with the air inlet channel 21, the air outlet chamber 42 is connected with the air outlet channel 11, and the circulating air chamber 43 connects the air inlet chamber 41 and the air outlet chamber 42. The air inlet channel 21 and the air outlet channel 11 are not connected to the same chamber 4 and are separated by the partition plate 3, so that the air flow can only enter the air outlet channel 11 through the circulating air chamber 43. When the air flow flows out of the air outlet channel 11, the air flow completes a loop movement. When the air flow flows in the air inlet chamber 41, the air outlet chamber 42, and the circulating air chamber 43, it will encounter different walls and cross-sections multiple times, resulting in multiple reflections, thereby increasing the reflection path of the sound wave, further increasing the loss of sound energy, so that the energy will gradually decay, thereby achieving the effect of noise reduction. And through multiple reflections, the speed of the air flow can be slowed down, reducing the generation of vortex and jet noise, thereby suppressing the formation of secondary noise, and the shape, size, and arrangement of the circulating air chamber 43 can be changed to perform targeted noise reduction treatment for different frequencies of noise.

[0026] In an embodiment, as Figure 1 shown, at least one partition plate 3 is provided in the circulating air chamber 43, and air holes 6 are correspondingly provided on the partition plate 3 to enable the air flow to circulate in the circulating air chamber 43. When the air flow passes through the air holes 6 on the baffle, because the air holes 6 increase the resistance of the air flow, the speed of the air flow is significantly reduced, which helps to reduce the noise generated by the air flow hitting the baffle or the inner wall of the air chamber. At the same time, the air holes 6 can guide the air flow to be distributed more evenly in the entire circulating air chamber 43, avoiding the local air flow speed being too fast or too slow, thereby reducing the noise and vibration generated by the uneven air flow.

[0027] In another embodiment, as Figure 2As shown, there is no baffle in the circulating air chamber 43. There are baffles between the circulating air chamber 43, the intake air chamber 41 and the outlet air chamber 42, and there are air holes 6 on the baffle. The air flow enters the circulating air chamber 43 from the intake air chamber 41 through the air holes 6 and then enters the outlet air chamber 42. The air flow passes through multiple chambers, changing the direction of the air flow, gradually reducing the air flow speed, and at the same time increasing the retention time of the air flow in the box body 1, making the effect of the sound-absorbing cotton 5 better, so as to achieve a better sound-absorbing effect.

[0028] To extend the retention time of the air flow in the chamber 4, two adjacent air holes 6 along the movement direction of the air flow are arranged in a staggered manner, so that the air flow passing through the adjacent air holes 6 forms a reciprocating spiral structure. When the air flow flows in the reciprocating spiral channel, the sound wave will be reflected and interfered multiple times between the partition plates 3, increasing the opportunity of sound wave attenuation and further improving the retention time of the air flow, thus improving the sound-absorbing effect. The staggered air holes 6 disperse the air flow in multiple directions, causing the sound wave energy to be dispersed in multiple directions, reducing the directly transmitted sound energy, and further reducing the noise level. At the same time, the staggered arrangement of the air holes 6 on the partition plate 3 helps to disperse the impact force of the air flow on the silencer structure, improving the overall stability and durability of the structure.

[0029] Furthermore, the air hole 6 is of a U-shaped structure, so that the air flow needs to pass through a longer path and more reflection points in the chamber 4, which helps to increase the contact area and time between the air flow and the sound-absorbing cotton 5, thus improving the attenuation effect on noise. And the height of the air hole 6 is greater than half of the height of the partition plate 3, which can reduce the turbulent noise generated due to the obstruction of the air flow and improve the overall efficiency of the silencer, ensuring that the air flow will not be overly obstructed during the sound-absorbing process.

[0030] Furthermore, a stepped surface 7 is provided on the inner side edge of the box body 1, and the top of the partition plate 3 is on the same horizontal plane as the stepped surface 7. When the cover plate 2 is covered on the box body 1, the bottom surface of the cover plate 2 coincides with the top of the partition plate 3 and the stepped surface 7, so that the cover plate 2 is completely pressed on the top of the partition plate 3, thus completely sealing the box body 1. After the air flow enters the box body 1 through the intake channel 21, due to the good sealing performance, the air flow can only pass through the air holes 6 on the partition plate 3 and sequentially pass through the intake air chamber 41, the circulating air chamber 43 and the outlet air chamber 42, and fully contact the sound-absorbing cotton 5 in the chamber 4, so as to achieve the sound-absorbing effect.

[0031] The implementation principle of this embodiment:

[0032] The cover plate 2 is placed on the box body 1, positioned by the stepped surface 7 and pressed on the top of the partition plate 3 to completely seal the box body 1. The air flow enters the air inlet cavity 41 from the air inlet channel 21, contacts the sound-absorbing cotton 5, and passes through the circulation air cavity 43 and the air outlet cavity 42 in sequence through the air holes 6, and finally is discharged from the air outlet channel 11. Inside the chamber 4, the air flow passes through multiple reflections of the baffle plate, gradually reducing the flow velocity of the air flow. At the same time, the adjacent air holes 6 are arranged in a staggered manner, further increasing the movement path and time of the air flow in the chamber 4, increasing the contact area and contact time with the sound-absorbing cotton 5. Under the combined action of the partition plate 3, the air holes 6 and the sound-absorbing cotton 5, the flow velocity of the air flow is gradually reduced, and the sound wave energy is gradually reduced, so as to achieve the reduction of the noise generated during nitrogen discharge.

[0033] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A nitrogen discharge and noise reduction structure, characterized in that, Comprising: A box body (1), the bottom surface of the box body (1) is provided with an air outlet channel (11); A cover plate (2), covering the box body (1), the cover plate (2) is provided with an air inlet channel (21); A partition plate (3), arranged inside the box body (1), dividing the box body (1) into multiple chambers (4), sound-absorbing cotton (5) is provided in each of the multiple chambers (4). When the cover plate (2) covers the box body (1), the bottom surface of the cover plate (2) contacts and seals the top of the partition plate (3). A plurality of air holes (6) are formed in the partition plate (3) to communicate the multiple chambers (4), so that the air flow passes through the multiple chambers (4) through the air inlet channel (21) and then flows out from the air outlet channel (11).

2. The nitrogen discharge and noise elimination structure according to claim 1, characterized in that: The chamber (4) includes an air inlet chamber (41), an air outlet chamber (42), and a circulating air chamber (43). The air inlet chamber (41) communicates with the air inlet channel (21), the air outlet chamber (42) communicates with the air outlet channel (11), and the circulating air chamber (43) communicates with the air inlet chamber (41) and the air outlet chamber (42) respectively through the air holes (6), so that the air flow sequentially passes through the air inlet chamber (41), the circulating air chamber (43), and the air outlet chamber (42).

3. The nitrogen discharge and noise elimination structure according to claim 2, characterized in that: At least one partition plate (3) is provided in the circulating air chamber (43), and corresponding air holes (6) are provided on the partition plate (3) to enable the air flow in the circulating air chamber (43) to circulate.

4. A nitrogen discharge and noise reduction structure according to claim 1, characterized in that: Along the movement direction of the air flow, two adjacent air holes (6) are arranged in a staggered manner, so that the air flow passing through the adjacent air holes (6) forms a reciprocating spiral structure.

5. The nitrogen discharge and noise elimination structure according to claim 1, characterized in that: The air hole (6) is of a U-shaped structure, and the height of the air hole (6) is greater than half of the height of the partition plate (3).

6. The nitrogen discharge and noise elimination structure according to claim 1, characterized in that: A step surface (7) is provided at the inner edge of the box body (1), and the top of the partition plate (3) is on the same horizontal plane as the step surface (7). When the cover plate (2) covers the box body (1), the bottom surface of the cover plate (2) coincides with the top of the partition plate (3) and the step surface (7).

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