CN220026554U - Air inlet pipeline in pressure swing adsorption oxygenerator - Google Patents

Abstract

The utility model relates to an air inlet pipeline in a pressure swing adsorption oxygenerator, and relates to the technical field of oxygenerators. The air inlet pipeline comprises a primary filtering silencer and a secondary interference silencer, and a communication pipeline is arranged between the primary filtering silencer and the secondary interference silencer; the first-stage filtering silencer comprises a first shell and a filtering silencer arranged in the first shell; the two ends of the first shell are respectively provided with a first air inlet and a first air outlet, and the filtering silencing piece is positioned between the first air inlet and the first air outlet; the second-stage interference silencer comprises a second shell and a silencing interference plate arranged in the second shell; the two ends of the second shell are respectively provided with a second air inlet and a second air outlet, and the silencing interference plate is positioned between the second air inlet and the second air outlet; one end of the communication pipeline is communicated with the first air outlet of the first shell, and the other end of the communication pipeline is communicated with the second air inlet of the second shell. The air inlet pipeline has good silencing and noise reducing effects.

Description

Air inlet pipeline in pressure swing adsorption oxygenerator

Technical Field

The utility model relates to the technical field of oxygenerators, in particular to an air inlet pipeline in a pressure swing adsorption oxygenerator.

Background

Pressure swing adsorption (Pressure Swing Adsorption, PSA for short) is a new gas separation technology that is a reversible physical adsorption process that works between two pressure states based on the physical adsorption of gas molecules by the internal surface of porous solid matter (adsorbent). Can be used to purify a gas mixture, taking adsorbent molecular sieves as an example, by taking advantage of the difference in molecular sieve "adsorption" properties of different gas molecules to separate the gas mixture.

The pressure swing adsorption oxygenerator is a device for producing oxygen by using air as a raw material and utilizing a pressure swing adsorption technology, and the pressure swing adsorption oxygenerator separates nitrogen and oxygen in the air by utilizing the selective adsorption performance of a high-efficiency and high-selectivity solid adsorbent (such as a carbon molecular sieve) on the nitrogen and the oxygen. The separation effect of the carbon molecular sieve on nitrogen and oxygen is mainly based on the fact that the diffusion rates of the two gases on the surface of the carbon molecular sieve are different, and the gas (oxygen) with smaller diameter diffuses faster and enters the molecular sieve solid phase more. Thus, a nitrogen enriched fraction is obtained in the gas phase. After a period of time, the adsorption of the carbon molecular sieve to oxygen reaches equilibrium, and according to the characteristic that the adsorption amount of the carbon molecular sieve to the adsorbed gas is different under different pressures, the pressure is reduced to enable the carbon molecular sieve to release the adsorption of the oxygen, and the process is called regeneration. Two adsorption columns are typically used to alternately perform pressure adsorption and pressure release regeneration to obtain a continuous oxygen stream.

The pressure swing adsorption oxygenerator needs to boost air by an air compressor and then convey the air to an adsorption tower of the pressure swing adsorption oxygenerator, the air compressor needs to filter and reduce noise in air intake, and a silencing and noise reducing device in the related art usually adopts primary filtering silencing, is single in comparison and has an unsatisfactory effect; if the effect is to be improved, the length of the air inlet pipeline is generally increased to increase air resistance of air inlet, so that noise reduction is realized, but the air inlet pipeline is prolonged to increase the complexity of an air path, so that the flow loss is larger.

Disclosure of Invention

In order to improve the filtering and noise reduction effects of inlet air in a pressure swing adsorption oxygenerator and reduce flow loss of the inlet air, the utility model provides an inlet air pipeline in the pressure swing adsorption oxygenerator.

The utility model provides an air inlet pipeline in a pressure swing adsorption oxygenerator, which adopts the following technical scheme:

an air inlet pipeline in a pressure swing adsorption oxygenerator comprises a primary filtering silencer and a secondary interference silencer;

the primary filter muffler comprises a first housing and a filter muffler disposed within the first housing; one end or one side of the first shell is provided with a first air inlet, the other end or the other side of the first shell opposite to the first shell is provided with a first air outlet, and the filtering silencer is positioned between the first air inlet and the first air outlet;

the secondary interference silencer comprises a second shell and a silencing interference plate arranged in the second shell; one end of the second shell is provided with a second air inlet, the other end of the second shell is provided with a second air outlet, and the silencing interference plate is positioned between the second air inlet and the second air outlet;

the first air outlet of the first shell is communicated with the second air inlet of the second shell.

The pressure swing adsorption oxygenerator is a device for efficiently purifying the oxygen concentration by adopting the pressure swing adsorption principle; the air inlet pipeline is mainly used for supplying air to the pressure swing adsorption oxygenerator. Through adopting the technical scheme, the silencer formed by two stages of serial connection is formed, air enters the first shell through the first air inlet and flows to the first air outlet, the air is subjected to first filtering and silencing through the filtering silencer, then enters the second shell through the second air inlet and flows to the second air outlet, the noise is reduced and silenced through the silencing interference plate in the process, and finally flows into the adsorption towers of the air compressor and the pressure swing adsorption oxygenerator through the second air outlet.

Optionally, the first housing is elongated; the filtering silencing piece is also in a strip shape, one end of the filtering silencing piece is abutted against the inner wall of one end of the first shell, and the other end of the filtering silencing piece is abutted against the inner wall of the other end of the first shell; the first air inlet is positioned at one side of the first shell and is close to one end of the filtering silencing piece, and the first air outlet is positioned at the other opposite side of the first shell and is close to the other end of the filtering silencing piece.

Through adopting above-mentioned technical scheme, the air flows from first air inlet to first gas outlet, and the circulation route is long to the complete amortization that carries out through filtering the amortization piece of maximum range is handled, further effective noise reduction that admits air.

Optionally, the filtering silencer comprises a plurality of V-shaped plates, and all the V-shaped plates are arranged side by side in a straight line;

and gas buffer cotton is arranged in the first shell and positioned at the first gas outlet.

Through adopting above-mentioned technical scheme, filter the amortization piece and present a plurality of V style of calligraphy and arrange or N style of calligraphy and arrange, through the gas buffering cotton, further reduction vibration, filtration air has the effect of high-efficient filtration amortization.

Optionally, the filtering silencer is detachably installed in the first shell; the first shell comprises a rear side plate and a front side cover shell, and the front side cover shell is detachably fastened on the rear side plate.

Through adopting above-mentioned technical scheme, the first shell adopts the detachable two parts of opening to constitute, is convenient for filter the installation of amortization piece, filters the amortization piece simultaneously and can regularly change, and it is convenient, with low costs to maintain, more sanitary safety.

Optionally, the filtering silencer is made of HEPA or aluminum silicate cotton or glass fiber surface.

By adopting the technical scheme, the filtering silencing piece is low in cost, mature in product and good in filtering silencing effect.

Optionally, the second housing includes a cylindrical barrel, one end of the barrel is closed, the other end of the barrel is provided with an opening, and the opening end of the barrel is provided with an end cover for closing the opening; the second air inlet is arranged at the closed end of the cylinder; the second air outlet is arranged on the end cover;

the silencing interference plate is disc-shaped and divides the interior of the cylinder into a first cavity close to the closed end of the cylinder and a second cavity close to the end cover; a plurality of vent holes are formed in the silencing interference plate; the second air outlet passes through the silencing interference plate through a first connecting pipe to be communicated with the first cavity, and the second air inlet passes through the silencing interference plate through a second connecting pipe to be communicated with the second cavity.

Through adopting above-mentioned technical scheme, after the air current gets into in the second shell, can turn back once in its inside, further increase amortization noise reduction's effect.

Optionally, a bar-shaped protruding edge is arranged on the inner wall of the cylinder, the length direction of the bar-shaped protruding edge is arranged along the axial direction of the cylinder, a clamping groove corresponding to the bar-shaped protruding edge is formed in the outer circumferential surface of the noise reduction interference plate, and the bar-shaped protruding edge is embedded in the corresponding clamping groove.

Through adopting above-mentioned technical scheme, the amortization interference plate is installed in the barrel, and through the cooperation of bar protruding stupefied and draw-in groove, it is spacing to carry out circumference to the amortization interference plate, prevents that it from rotating, realization that can be quick convenient is installed to improve its stability.

Optionally, an annular step is arranged on the inner wall of the cylinder, the annular step is arranged along the circumferential direction of the cylinder, and one side of the silencing interference plate, which faces the closed end of the cylinder, is abutted against the annular step.

Through adopting above-mentioned technical scheme, when amortization interference board installs, carry out axial spacing to the amortization interference board through annular step, can be quick convenient realization location and spacing, improve its convenience and the stability of installation.

Optionally, the open end of the cylinder is provided with a step groove; the end cover is embedded in the step groove, a connecting cylinder inserted into the cylinder body is arranged on the inner side of the end cover, and a sealing ring is arranged between the outer peripheral surface of the connecting cylinder and the inner wall of the cylinder body;

the first connecting pipe is fixedly connected to the end cover or integrally formed with the end cover; one end of the first connecting pipe extends into the first cavity, and the other end of the first connecting pipe extends to the outer side of the end cover.

Through adopting above-mentioned technical scheme, the equipment and the connection of whole product of being convenient for whole product has higher integrated level, and the gas circuit noise is difficult to transfer out, has reduced the degree of difficulty of making an uproar that falls, and can reduce gas flow loss.

Optionally, the noise reduction interference plate is made of plastic materials, or is sprayed with sound absorption paint.

The noise reduction interference plate is made of plastic materials and has a certain sound absorption effect, and meanwhile, the noise reduction interference plate can be produced through an injection molding process, and is simple in manufacturing process and low in manufacturing cost. The sound-absorbing coating can be formed by adopting biological fibers, and other main raw materials in combination with other fireproof agents, moisture-proof agents, enzyme corrosion-proof agents and the like, and is sprayed out together with an adhesive through professional machinery to be attached to the side surface of the noise-reducing interference plate, so that a cotton-shaped coating structure with pores and the appearance of 2-10 mm thickness is formed, and the noise-reducing function is realized. Through adopting above-mentioned technical scheme, amortization interference plate is with low costs, and the product is ripe, and can promote the sound absorbing effect.

In summary, the present utility model includes at least one of the following beneficial technical effects:

1. the utility model skillfully combines the filtering silencer and the silencing interference plate, adopts a two-stage series process to realize the filtering and noise reduction of the air inlet, and after the silencing treatment in the primary filtering silencer, the air inlet is treated by the secondary interference silencer through the communication pipeline, so that the noise energy attenuation is faster and the noise reduction effect is more obvious.

2. The communication pipeline is relatively short, the two-stage silencing structure effectively reduces air inlet noise, simultaneously greatly reduces flow loss and improves efficiency.

3. The first shell is formed by two parts which can be detached and opened, so that the installation of the filtering silencing piece is facilitated, meanwhile, the filtering silencing piece can be replaced regularly, the maintenance is convenient, the cost is low, and the device is more sanitary and safer.

4. The whole product has higher integration level, the gas path noise is not easy to transfer out, the noise reduction difficulty is reduced, and the gas flow loss can be reduced.

5. The product of the utility model has good consistency, small air resistance and small flow loss, thus having small influence on the temperature rise of the air compressor and greatly increasing the service efficiency and the service life.

Drawings

Fig. 1 is a schematic view of a first perspective structure of an air inlet pipeline in the utility model.

Fig. 2 is a schematic view of a second perspective structure of an air inlet pipeline in the utility model.

FIG. 3 is a schematic view of the explosive structure of the primary filter muffler of the present utility model.

FIG. 4 is a schematic cross-sectional view of a primary filter muffler of the present utility model.

FIG. 5 is a schematic cross-sectional view of a two-stage filtering muffler according to the present utility model.

In the figure:

100. a primary filtering muffler; 11. a first housing; 111. a first air inlet; 112. a first air outlet; 113. a rear side plate; 114. a front side cover; 12. a filtering silencer; 121. v-shaped plates; 13. an end plate; 14. gas buffer cotton;

200. a secondary interference muffler; 21. a second housing; 211. a second air inlet; 212. a second air outlet; 213. a cylinder; 2131. strip-shaped convex edges; 2132. an annular step; 2133. a step groove; 214. an end cap; 2141. a connecting cylinder; 215. a first cavity; 216. a second cavity; 217. a seal ring; 22. a silencing interference plate; 221. a vent hole; 23. a first connection pipe; 24. a second connection pipe;

300. and a communication pipeline.

Detailed Description

The present utility model will be described in further detail with reference to fig. 1 to 5.

Referring to fig. 1 and 2, an intake pipe in a pressure swing adsorption oxygenerator according to the present utility model includes a primary filtering silencer 100 and a secondary interference silencer 200, and the primary filtering silencer 100 and the secondary interference silencer 200 may be directly connected to each other, or a communication pipe 300 may be provided between the primary filtering silencer 100 and the secondary interference silencer 200, and may be connected to each other through the communication pipe 300; the first-stage filtering silencer 100 comprises a first shell 11, wherein the first shell 11 is of a cuboid structure, a first air inlet 111 is formed in one end side part of the first shell 11, a first air outlet 112 is formed in the other opposite end side part of the first shell 11, namely, the first air outlet 112 and the first air inlet 111 are respectively arranged at two opposite ends of the first shell 11 and are respectively arranged at two opposite sides of the first shell 11; the secondary interference silencer 200 includes a second casing 21, one end of the second casing 21 having a second air inlet 211, and the other end of the second casing 21 having a second air outlet 212. If the primary filtering muffler 100 and the secondary interference muffler 200 are directly connected, the first air outlet 112 of the first housing 11 and the second air inlet 211 of the second housing 21 are rigidly connected; if the communication pipeline 300 is provided, the communication pipeline 300 may be a flexible pipe or a rigid pipe, one end of the communication pipeline 300 is communicated with the first air outlet 112 of the first housing 11, and the other end of the communication pipeline 300 is communicated with the second air inlet 211 of the second housing 21.

Referring to fig. 3, a filter silencer 12 is disposed in the first housing 11, and the filter silencer 12 is located between the first air inlet 111 and the first air outlet 112; the filter silencer 12 is detachably arranged in the first shell 11; the first housing 11 comprises a rear side plate 113 and a front side cover 114, and the front side cover 114 is detachably fastened on the rear side plate 113, namely, the first housing 11 is formed by two parts which can be opened and closed in a detachable way, so that the first housing 11 can be opened and closed conveniently, and the filter silencer 12 can be installed conveniently; the filtering silencer 12 can be replaced regularly, is convenient to maintain and low in cost, and is more sanitary and safer. The whole filter silencer 12 is also in a strip shape, one end of the filter silencer 12 is abutted against the inner wall of one end of the first shell 11, and the other end of the filter silencer 12 is abutted against the inner wall of the other end of the first shell 11; the air flows from the first air inlet 111 to the first air outlet 112, so that the whole flow path is relatively long, and the maximum amplitude of the air can be completely subjected to silencing treatment through the filtering silencing piece 12, thereby effectively reducing the air inlet noise.

Referring to fig. 4, the filtering silencer 12 includes a plurality of V-shaped plates 121, and all V-shaped plates 121 are arranged side by side in a straight line; an end plate 13 is further arranged between the two V-shaped plates 121 at the outermost side in the filtering silencer 12 and the inner wall of the first shell 11, and the end plate 13 is used for coating the filtering silencer 12; the first shell 11 is internally provided with gas buffer cotton 14 at the first gas outlet 112; the filtering and silencing piece 12 is in a plurality of V-shaped arrangement or N-shaped arrangement, vibration is reduced through the end plate 13 and the gas buffering cotton 14, air is filtered, and the efficient filtering and silencing effect is achieved.

The filtering and silencing piece 12 is made of HEPA or aluminum silicate cotton or glass fiber surface, and is low in cost, mature in product and good in filtering and silencing effect.

Referring to fig. 5, a silencing interference plate 22 is provided in the second housing 21; the silencing interference plate 22 is located between the second air inlet 211 and the second air outlet 212; the second housing 21 includes a cylindrical tube 213, one end of the tube 213 being closed, the other end having an opening, the open end of the tube 213 being provided with an end cap 214 capable of closing the opening; the second air inlet 211 is arranged at the closed end of the cylinder 213; the second air outlet 212 is disposed on an end cap 214; the silencing interference plate 22 takes the shape of a disc and divides the interior of the cylinder 213 into a first cavity 215 near the closed end of the cylinder 213 and a second cavity 216 near the end cap 214; the silencing interference plate 22 is provided with a plurality of vent holes 221; the second air outlet 212 communicates with the first cavity 215 through the silencing interference panel 22 by the first connection pipe 23, and the second air inlet 211 communicates with the second cavity 216 through the silencing interference panel 22 by the second connection pipe 24. After the air flow enters the second housing 21, the air flow is turned back once in the second housing, so that the effects of noise reduction and noise reduction are further improved.

Referring to fig. 5, a bar-shaped protrusion 2131 is provided on the inner wall of the cylinder 213, the length direction of the bar-shaped protrusion 2131 is along the axial direction of the cylinder 213, a clamping groove corresponding to the bar-shaped protrusion 2131 is provided on the outer circumferential surface of the noise reduction interference plate 22, and the bar-shaped protrusion 2131 is embedded in the corresponding clamping groove; an annular step 2132 is arranged on the inner wall of the cylinder 213, the annular step 2132 is arranged along the circumferential direction of the cylinder 213, and the silencing interference plate 22 abuts against the annular step 2132 towards one side of the closed end of the cylinder 213; the silencing interference plate 22 is arranged in the cylinder 213, and the silencing interference plate 22 is circumferentially limited and prevented from rotating by the cooperation of the strip-shaped convex edges 2131 and the clamping grooves; the annular step 2132 is used for axially limiting the silencing interference plate 22, so that the positioning and limiting of the silencing interference plate 22 can be realized quickly and conveniently, and the convenience and stability of installation of the silencing interference plate are improved. The open end of the cylinder 213 is also provided with a stepped groove 2133; the end cap 214 is fitted in the stepped groove 2133, and the inside of the end cap 214 has a connecting tube 2141 inserted into the cylinder 213, and a seal ring 217 is provided between the outer peripheral surface of the connecting tube 2141 and the inner wall of the cylinder 213, thereby realizing the sealing connection between the end cap 214 and the cylinder 213.

Referring to fig. 5, the first connection pipe 23 is fixedly attached to the end cover 214 or integrally formed with the end cover 214; one end of the first connecting pipe 23 stretches into the first cavity 215, and the other end of the first connecting pipe 23 extends to the outer side of the end cover 214, so that the whole product is convenient to assemble and connect, the whole product has higher integration level, the air channel noise is not easy to transfer out, the noise reduction difficulty is reduced, and the air flow loss can be reduced.

The silencing interference plate 22 can be made of plastic materials, is produced through an injection molding process, is simple in manufacturing process and low in manufacturing cost, and has a certain sound absorption effect. Alternatively, the sound-absorbing paint may be sprayed on the noise-reducing interference plate 22, for example, the sound-absorbing paint is formed by combining main raw materials such as biological fibers and mineral fibers with other fireproof agents, moisture-proof agents, enzyme corrosion-proof agents and the like, and sprayed out together with the adhesive by professional machinery to adhere to the side surface of the noise-reducing interference plate 22, so that a cotton-like coating structure with pores and having a thickness of 2-10 mm is formed, and the noise-reducing function can be realized.

The implementation principle is as follows: the pressure swing adsorption oxygenerator adopts the pressure swing adsorption principle to purify the oxygen concentration efficiently; the air inlet pipeline is mainly used for supplying air to the pressure swing adsorption oxygenerator. The air inlet pipeline adopts a silencer consisting of two stages connected in series, and the filtering silencer 12 and the silencing interference plate 22 are skillfully combined to realize the filtering and noise reduction of the air inlet. When the silencer is used, air enters the first shell 11 through the first air inlet 111 and flows to the first air outlet 112, the air enters the second shell 21 through the first air inlet 111 and the second air inlet 211 after being filtered and silenced for the first time in the process, and flows to the second air outlet 212, the air enters the second air compressor and the adsorption tower of the pressure swing adsorption oxygenerator through the second air outlet 212 after being noise-reduced and silenced for the second time through the silencing interference plate 22 in the process, and the air is processed through the two-stage silencers, so that noise energy is fast attenuated and the noise reduction effect is obvious.

The embodiments of the present utility model are all preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model, wherein like reference numerals are used to refer to like elements throughout. Therefore: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (10)

1. An air inlet pipeline in a pressure swing adsorption oxygenerator is characterized by comprising a primary filtering silencer (100) and a secondary interference silencer (200);

the primary filtering silencer (100) comprises a first shell (11) and a filtering silencer (12) arranged in the first shell (11); one end of the first shell (11) is provided with a first air inlet (111), the other end of the first shell (11) is provided with a first air outlet (112), and the filtering silencer (12) is positioned between the first air inlet (111) and the first air outlet (112);

the secondary interference silencer (200) comprises a second shell (21) and a silencing interference plate (22) arranged in the second shell (21); one end of the second shell (21) is provided with a second air inlet (211), the other end of the second shell (21) is provided with a second air outlet (212), and the silencing interference plate (22) is positioned between the second air inlet (211) and the second air outlet (212);

the first air outlet (112) of the first housing (11) is in communication with the second air inlet (211) of the second housing (21).

2. An inlet line in a pressure swing adsorption oxygenerator according to claim 1, wherein the first housing (11) is elongated; the filtering silencer (12) is also in a strip shape, one end of the filtering silencer (12) is abutted against the inner wall of one end of the first shell (11), and the other end of the filtering silencer (12) is abutted against the inner wall of the other end of the first shell (11); the first air inlet (111) is located at one side of the first shell (11) and is close to one end of the filtering silencer (12), and the first air outlet (112) is located at the other opposite side of the first shell (11) and is close to the other end of the filtering silencer (12).

3. The air inlet pipeline in the pressure swing adsorption oxygenerator according to claim 2, wherein the filtering silencer (12) comprises a plurality of V-shaped plates (121) and all the V-shaped plates (121) are arranged side by side in a straight line;

a gas buffer cotton (14) is arranged in the first shell (11) and located at the first gas outlet (112).

4. A pressure swing adsorption oxygenerator inlet line according to claim 1, 2 or 3, wherein the filter silencer (12) is removably mounted in the first housing (11); the first shell (11) comprises a rear side plate (113) and a front side cover shell (114), and the front side cover shell (114) is detachably fastened on the rear side plate (113).

5. A gas inlet line in a pressure swing adsorption oxygenerator according to claim 1 or 2 or 3, wherein the filter silencer (12) is made of HEPA or of aluminium silicate wool or of glass fibre.

6. A gas inlet line in a pressure swing adsorption oxygenerator according to claim 1, 2 or 3, characterized in that the second housing (21) comprises a cylindrical barrel (213), one end of the barrel (213) being closed and the other end having an opening, the open end of the barrel (213) being provided with an end cap (214) closing the opening; the second air inlet (211) is arranged at the closed end of the cylinder (213); the second air outlet (212) is arranged on the end cover (214);

the silencing interference plate (22) takes a disc shape and divides the interior of the cylinder (213) into a first cavity (215) near the closed end of the cylinder (213) and a second cavity (216) near the end cover (214); a plurality of vent holes (221) are formed in the silencing interference plate (22); the second air outlet (212) penetrates through the silencing interference plate (22) through a first connecting pipe (23) to be communicated with the first cavity (215), and the second air inlet (211) penetrates through the silencing interference plate (22) through a second connecting pipe (24) to be communicated with the second cavity (216).

7. The air inlet pipeline in the pressure swing adsorption oxygenerator according to claim 6, wherein a strip-shaped protruding edge (2131) is arranged on the inner wall of the cylinder (213), the length direction of the strip-shaped protruding edge (2131) is arranged along the axial direction of the cylinder (213), a clamping groove corresponding to the strip-shaped protruding edge (2131) is formed in the outer peripheral surface of the silencing interference plate (22), and the strip-shaped protruding edge (2131) is embedded in the corresponding clamping groove.

8. An inlet line in a pressure swing adsorption oxygenerator according to claim 6, characterized in that an annular step (2132) is provided on the inner wall of the cylinder (213), the annular step (2132) being provided in the circumferential direction of the cylinder (213), the silencing interference plate (22) abutting against the annular step (2132) towards the side of the closed end of the cylinder (213).

9. The gas inlet pipeline in the pressure swing adsorption oxygenerator according to claim 6, wherein the open end of the cylinder (213) is provided with a stepped groove (2133); the end cover (214) is embedded in the step groove (2133), a connecting cylinder (2141) which is inserted into the cylinder body (213) is arranged on the inner side of the end cover (214), and a sealing ring (217) is arranged between the outer peripheral surface of the connecting cylinder (2141) and the inner wall of the cylinder body (213);

the first connecting pipe (23) is fixedly connected to the end cover (214) or is integrally formed with the end cover (214); one end of the first connecting pipe (23) extends into the first cavity (215), and the other end of the first connecting pipe (23) extends to the outer side of the end cover (214).

10. A pressure swing adsorption oxygenerator inlet line according to claim 1, 2 or 3, wherein the noise reducing interference plate (22) is made of plastic material or the noise reducing interference plate (22) is coated with a sound absorbing coating.