Nitrogen removal device of medical oxygen generation system

Abstract

The invention relates to the technical field of oxygen generation equipment, and discloses a nitrogen removal device of a medical oxygen generation system, which comprises a shell, a fixed baffle plate arranged in the shell, an adsorption assembly and a nitrogen removal mechanism arranged in the shell, and a conversion assembly arranged on the fixed baffle plate, and the nitrogen discharging mechanism comprises a nitrogen discharging shell fixedly assembled on the shell, and a driving assembly, an extrusion assembly and a nitrogen discharging assembly are assembled in the nitrogen discharging shell from left to right. According to the nitrogen discharging device of the medical oxygen generation system, nitrogen is conveyed to the spiral nitrogen discharging pipe through the nitrogen discharging connecting pipe, the nitrogen is specially guided and restrained when flowing in the pipe by means of the conical gradual change structure of the spiral nitrogen discharging pipe, the flow speed is correspondingly increased, the laminar flow state possibly formed by the nitrogen in the pipe can be broken, the nitrogen flows more evenly and fully, and the nitrogen discharging efficiency is improved. And meanwhile, the nitrogen is shunted through the exhaust holes uniformly distributed in the spiral nitrogen discharge pipe, so that the nitrogen is discharged orderly through the exhaust holes, and the problem of non-uniform discharge is avoided.

Description

Technical Field

[0001] This invention relates to the field of oxygen generation equipment technology, and more particularly to a nitrogen removal device for a medical oxygen generation system. Background Technology

[0002] A medical oxygen concentrator is a medical device based on the principle of pressure swing adsorption (PSA), which uses molecular sieves to selectively adsorb nitrogen from the air to extract high-purity oxygen. Its core structure includes an adsorption tower (containing a molecular sieve), an air compressor, a nitrogen removal device, and a control system. During oxygen production, compressed air enters the adsorption tower, where the molecular sieve preferentially adsorbs nitrogen, while oxygen is discharged and collected through the tower. However, as the adsorption process continues, the molecular sieve gradually reaches nitrogen adsorption saturation. At this point, the nitrogen removal device is needed to quickly desorb the adsorbed nitrogen and remove it from the tower to regenerate the molecular sieve and maintain continuous oxygen production capacity.

[0003] Currently, traditional nitrogen removal devices still have the following problems during use. Under long-term continuous operation, existing nitrogen removal devices often cannot ensure the high efficiency of nitrogen emission. Due to the limitations of the nitrogen removal structure design, the emission rate of nitrogen in the adsorption tower is slow, and the accumulated nitrogen cannot be discharged in time. In addition, the straight-pipe nitrogen removal channel, due to its constant pipe diameter, cannot adapt to changes in nitrogen concentration gradient in the adsorption tower, resulting in excessively high initial nitrogen removal pressure and insufficient nitrogen removal power in the later stage, which easily leads to nitrogen residue. At the same time, the lack of diversion design leads to severe local airflow turbulence and poor nitrogen removal uniformity. Therefore, these devices have shortcomings and cannot meet the user's needs. Thus, further improvements are necessary.

[0004] Therefore, in view of this, we will study and improve the existing structure and its shortcomings, and provide a nitrogen removal device for medical oxygen generation systems in order to achieve a more practical purpose. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a nitrogen removal device for a medical oxygen generation system, which is achieved by the following specific technical means: A nitrogen removal device for a medical oxygen generation system includes a housing, a fixed baffle disposed in the housing, an adsorption component and a nitrogen removal mechanism disposed in the housing, and a conversion component disposed on the fixed baffle. The nitrogen removal mechanism includes a nitrogen removal shell fixedly mounted on the housing, and the nitrogen removal shell is equipped with a drive assembly, a squeezing assembly and a nitrogen removal assembly from left to right inside the nitrogen removal shell; The nitrogen removal assembly includes a spiral nitrogen removal pipe, with a nitrogen removal connecting pipe fixedly connected to the left end of the spiral nitrogen removal pipe. A deformable rubber tube is fitted onto the nitrogen removal connecting pipe. Several evenly distributed exhaust holes are opened on the pipe wall of the spiral nitrogen removal pipe. An inner cavity is opened in the pipe wall of the spiral nitrogen removal pipe, and sound-absorbing cotton for sound absorption and noise reduction is placed in the inner cavity. The spiral nitrogen removal pipe uses a tapered gradient and spiral flow guidance to make the nitrogen gas flow form a stable vortex and be evenly discharged along the spiral path.

[0006] As a further description of the above technical solution: The adsorption assembly includes a rotating frame assembled in a housing, on which two adsorption towers are mounted, and molecular sieves are provided inside the adsorption towers. Ventilation connectors for ventilation are fixedly mounted on the upper and lower sides of the two adsorption towers.

[0007] As a further description of the above technical solution: An air inlet pipe for transmitting air is fixedly installed inside the shell and above the adsorption tower. One end of the air inlet pipe is connected to the adsorption tower through a vent connector. An oxygen supply pipe and a nitrogen discharge pipe are installed inside the shell and below the adsorption tower, respectively. Both the oxygen supply pipe and the nitrogen discharge pipe are connected to the two adsorption towers through vent connectors.

[0008] As a further description of the above technical solution: The conversion assembly includes a servo motor fixedly mounted on a fixed baffle and a rotating shaft fixedly mounted on a rotating frame. A first gear plate is fixedly mounted on the lower output end of the servo motor, and a second gear plate is fixedly mounted on the rotating shaft. A transmission belt connects the first gear plate and the second gear plate.

[0009] As a further description of the above technical solution: The drive assembly includes a fixed frame and a fixed bracket fixedly mounted on the nitrogen exhaust shell. A drive fan is fixedly mounted inside the fixed frame, and a reducer is fixedly mounted on the fixed bracket. A first rotating shaft is fixedly mounted on one side of the drive fan. One end of the first rotating shaft is fixedly connected to the reducer, and a second rotating shaft is fixedly connected to one side of the reducer through its output end.

[0010] As a further description of the above technical solution: The extrusion assembly includes an extrusion ring fixedly mounted on a nitrogen venting shell and an extrusion sleeve fixedly mounted on a second rotating shaft. An extrusion rod is fixedly mounted on the outer wall of the extrusion sleeve, and an extrusion block is fixedly mounted on the end of the extrusion rod away from the extrusion sleeve. An opening groove is formed on the inner wall of the extrusion ring, and the extrusion block is located in the opening groove of the extrusion ring.

[0011] As a further description of the above technical solution: The nitrogen venting mechanism also includes a pressure sealing assembly, which includes a pressure sealing block fixedly mounted on the inner wall of the nitrogen venting shell. The pressure sealing block has a ventilation channel and a groove, in which an elastic rubber ring is fixedly mounted. A pressure sealing plate for blocking the ventilation channel is fixedly connected to one side of the elastic rubber ring, and an exhaust port for venting nitrogen is provided on the pressure sealing plate.

[0012] As a further description of the above technical solution: The ventilation channel includes a first channel and a second channel, wherein the inner diameter of the first channel is larger than the inner diameter of the second channel.

[0013] As a further description of the above technical solution: The nitrogen removal mechanism also includes a protective baffle fixedly mounted on one side of the nitrogen removal shell for dust prevention; The sound-absorbing cotton is made of porous polyurethane material.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The nitrogen removal device of this medical oxygen generation system delivers nitrogen to a spiral nitrogen removal pipe via a nitrogen removal connecting pipe. Utilizing the tapered, gradually changing structure of the spiral nitrogen removal pipe, the nitrogen flow within the pipe is specially guided and constrained, resulting in a faster flow velocity. This helps break the laminar flow state that nitrogen might form within the pipe, making the nitrogen flow more uniform and sufficient. Simultaneously, the evenly distributed exhaust holes on the spiral nitrogen removal pipe divert the nitrogen flow, ensuring orderly discharge through each exhaust hole and avoiding uneven discharge. This design ensures that nitrogen is discharged from the adsorption tower in a more balanced manner. When the airflow is dispersed into multiple streams, each stream accelerates as the cross-sectional area of ​​the exhaust hole decreases, resulting in a more balanced overall pressure distribution. This prevents localized excessively fast or slow airflow, significantly improving nitrogen removal efficiency, reducing the residual time of nitrogen in the system, and ensuring uniform nitrogen discharge. Furthermore, the uniform nitrogen discharge avoids pressure unevenness caused by localized nitrogen accumulation, reducing pressure fluctuations within the system. This allows the oxygen generation system to operate more stably and extends the service life of key system components.

[0015] 2. The nitrogen removal device of this medical oxygen generation system incorporates porous polyurethane sound-absorbing cotton within the spiral nitrogen removal tube wall. This cotton absorbs and dissipates sound energy, effectively reducing sound propagation and vibration. Simultaneously, the spiral structure of the spiral nitrogen removal tube effectively reduces turbulent noise during high-speed nitrogen flow. Combined with the porous polyurethane sound-absorbing cotton, this further reduces emission noise. This dual noise reduction design creates a relatively quiet operating environment for the oxygen generation system, enhancing the overall user experience. It is particularly suitable for medical environments with high noise requirements.

[0016] 3. The nitrogen removal device of this medical oxygen generation system intermittently squeezes the rubber tube using a squeezing block. When the squeezing block periodically squeezes the rubber tube, the tube volume contracts instantaneously, forcing the internal nitrogen gas to be ejected at an accelerated speed, forming a pulsed airflow. This effectively enhances the nitrogen removal power, allowing residual nitrogen gas to be more thoroughly discharged from the adsorption tower. After the squeezing block is released, the elastic rebound of the rubber tube generates negative pressure, which can reverse the suction of residual gas in the adsorption tower, preventing nitrogen gas retention and a decrease in oxygen purity. At the same time, this structure also has a pressure buffering function. The elastic deformation of the rubber tube can absorb the pressure fluctuations during nitrogen gas emission, preventing the airflow impact from causing vibration or pulverization of the molecular sieve bed, extending the service life of the core components. Furthermore, the non-steady airflow generated by intermittent squeezing can disrupt the harmonic superposition of nitrogen removal noise, reducing the sound pressure level and further meeting the low-noise requirements of the medical environment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the installation structure of the housing and adsorption assembly provided according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of the overall shell structure provided according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of the installation structure of the housing and nitrogen removal mechanism according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the housing and conversion assembly mounting structure provided according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the housing and nitrogen venting shell installation structure provided according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the installation structure of the nitrogen venting shell and nitrogen venting assembly provided according to an embodiment of the present invention is shown; Figure 7 A schematic diagram of the internal structure of the nitrogen venting shell provided according to an embodiment of the present invention is shown; Figure 8 A schematic diagram of the installation structure of the drive assembly and the extrusion assembly provided according to an embodiment of the present invention is shown; Figure 9 A partial structural schematic diagram of a spiral nitrogen removal pipe provided according to an embodiment of the present invention is shown; Figure 10 The present invention provides an embodiment of the invention. Figure 3 Enlarged diagram of part A in the middle; Figure 11 The present invention provides an embodiment of the invention. Figure 7 Enlarged schematic diagram of part B in the middle.

[0019] Legend: 10. Shell; 11. Fixed baffle; 12. Main air intake pipe; 13. Main oxygen supply pipe; 14. Main nitrogen discharge pipe; 20. Adsorption assembly; 21. Rotating frame; 22. Adsorption tower; 23. Ventilation connector; 30. Conversion component; 31. Servo motor; 32. Rotary shaft; 33. First gear plate; 34. Second gear plate; 35. Drive belt; 40. Nitrogen venting mechanism; 41. Nitrogen venting shell; 42. Nitrogen venting assembly; 421. Spiral nitrogen venting pipe; 422. Nitrogen venting connecting pipe; 423. Rubber hose; 424. Exhaust port; 425. Sound-absorbing cotton; 43. Drive assembly; 431. Fixing frame; 432. Drive fan; 433. First rotating shaft; 434. Fixing bracket; 435. Reducer; 436. Second rotating shaft; 44. Extrusion assembly; 441. Extrusion ring; 442. Extrusion sleeve; 443. Extrusion rod; 444. Extrusion block; 45. Sealing assembly; 451. Sealing block; 452. Ventilation channel; 4521. First channel; 4522. Second channel; 453. Sealing plate; 454. Elastic rubber ring; 455. Exhaust port; 46. Protective baffle. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 11A nitrogen removal device for a medical oxygen generation system includes a housing 10, a fixed baffle 11 disposed within the housing 10, an adsorption assembly 20 disposed within the housing 10, a nitrogen removal mechanism 40, and a conversion assembly 30 disposed on the fixed baffle 11. The nitrogen removal mechanism 40 includes a nitrogen removal shell 41 fixedly mounted on the housing 10. From left to right, a drive assembly 43, a compression assembly 44, and a nitrogen removal assembly 42 are respectively mounted inside the nitrogen removal shell 41. The nitrogen removal assembly 42 includes a spiral nitrogen removal mechanism. The left end of the spiral nitrogen venting pipe 421 is fixedly connected to a nitrogen venting connecting pipe 422. A deformable rubber tube 423 is installed on the nitrogen venting connecting pipe 422. Several evenly distributed exhaust holes 424 are opened on the pipe wall of the spiral nitrogen venting pipe 421. An inner cavity is opened in the pipe wall of the spiral nitrogen venting pipe 421, and sound-absorbing cotton 425 for sound absorption and noise reduction is installed in the inner cavity. The spiral nitrogen venting pipe 421 makes the nitrogen gas flow form a stable vortex and evenly discharge along the spiral path through tapered gradual change and spiral flow guidance.

[0022] Nitrogen gas is transported to the spiral nitrogen venting pipe 421 via the nitrogen venting pipe 422. The tapered, gradually changing structure of the spiral nitrogen venting pipe 421 provides special guidance and constraint for the nitrogen flow within the pipe, resulting in a faster flow rate. This helps break the laminar flow state that nitrogen gas might form within the pipe, making the nitrogen flow more uniform and sufficient. Simultaneously, the evenly distributed exhaust holes 424 on the spiral nitrogen venting pipe 421 divert the nitrogen gas, ensuring orderly discharge through each exhaust hole 424 and avoiding uneven discharge. This design ensures that nitrogen gas is discharged from the adsorption tower 22 in a relatively balanced manner. When the gas flow is dispersed into multiple streams, each stream accelerates as the cross-sectional area of ​​the exhaust hole 424 decreases, resulting in a more balanced overall pressure distribution. This prevents localized excessively fast or slow airflows, significantly improving nitrogen venting efficiency and reducing the residual time of nitrogen gas in the system. Furthermore, the uniform nitrogen discharge avoids pressure unevenness caused by localized nitrogen accumulation, reducing pressure fluctuations within the system. This allows the oxygen production system to operate more stably and extends the service life of key system components.

[0023] Please see Figures 3 to 4 The adsorption assembly 20 includes a rotating frame 21 assembled in the housing 10. Two adsorption towers 22 are mounted on the rotating frame 21, and molecular sieves are provided inside the adsorption towers 22. Ventilation connectors 23 for ventilation are fixedly mounted on the upper and lower sides of the two adsorption towers 22. The molecular sieves inside the adsorption towers 22 have selective adsorption characteristics for nitrogen in the air, which can adsorb nitrogen and allow oxygen to pass through.

[0024] Please see Figures 3 to 4An air inlet pipe 12 for transmitting air is fixedly installed inside the housing 10 and above the adsorption tower 22. One end of the air inlet pipe 12 is connected to the adsorption tower 22 through a vent connector 23. An oxygen supply pipe 13 and a nitrogen exhaust pipe 14 are respectively installed inside the housing 10 and below the adsorption tower 22. Both the oxygen supply pipe 13 and the nitrogen exhaust pipe 14 are connected to the two adsorption towers 22 through the vent connector 23. During the operation of the medical oxygen generation system, the compressed and cooled air is first introduced into the adsorption tower 22 through the air inlet pipe 12. The adsorption tower 22 is filled with molecular sieves. The molecular sieves have selective adsorption characteristics for nitrogen in the air and can adsorb nitrogen while allowing oxygen to pass through. The oxygen is then transported along the oxygen supply pipe 13 to the gas storage tank in the subsequent process for user use.

[0025] Please see Figures 2 to 4 , Figure 10 The conversion assembly 30 includes a servo motor 31 fixedly mounted on a fixed baffle 11 and a rotating shaft 32 fixedly mounted on a rotating frame 21. A first gear 33 is fixedly mounted on the lower output end of the servo motor 31, and a second gear 34 is fixedly mounted on the rotating shaft 32. A transmission belt 35 drives the first gear 33 and the second gear 34. When the servo motor 31 is started, the output end of the servo motor 31 drives the first gear 33 to rotate. The first gear 33 is connected to the second gear 34 through the transmission belt 35. Under the coordinated action of the transmission belt 35, the second gear disk 34 rotates accordingly, and the second gear disk 34 drives the rotating shaft 32 to rotate. The rotating shaft 32 then drives the rotating frame 21 and the adsorption tower 22 to rotate synchronously, thereby realizing the replacement of the positions of the two adsorption towers 22. After the switch, the adsorption tower 22 in good condition moves to the oxygen filtration area to continue adsorbing and producing oxygen, and the saturated adsorption tower 22 moves to the nitrogen removal mechanism 40 side to desorb nitrogen, forming a dual-tower alternating operation mode, eliminating the intermittent oxygen production of a single tower, and realizing continuous oxygen output and synchronous nitrogen discharge.

[0026] Please see Figures 6 to 8 The drive assembly 43 includes a fixed frame 431 and a fixed bracket 434 fixedly mounted on the nitrogen venting shell 41. A drive fan 432 is fixedly mounted inside the fixed frame 431, and a reducer 435 is fixedly mounted on the fixed bracket 434. A first rotating shaft 433 is fixedly mounted on one side of the drive fan 432. One end of the first rotating shaft 433 is fixedly connected to the reducer 435. A second rotating shaft 436 is fixedly connected to one side of the reducer 435 through its output end. During operation, the drive fan 432, through the synergistic effect between the drive fan 432, the first rotating shaft 433, the reducer 435, and the second rotating shaft 436, causes the reducer 435 to drive the second rotating shaft 436 to rotate slowly, thereby driving the second rotating shaft 436.

[0027] Please see Figures 6 to 8The extrusion assembly 44 includes an extrusion ring 441 fixedly mounted on the nitrogen venting shell 41 and an extrusion sleeve 442 fixedly mounted on the second rotating shaft 436. An extrusion rod 443 is fixedly mounted on the outer wall of the extrusion sleeve 442. An extrusion block 444 is fixedly mounted on the end of the extrusion rod 443 away from the extrusion sleeve 442. An opening groove is opened on the inner wall of the extrusion ring 441, and the extrusion block 444 is located in the opening groove of the extrusion ring 441. The extrusion rod 443 drives the extrusion block 444 to rotate in the opening groove of the extrusion ring 441. During the movement of the extrusion block 444 in the opening groove, it will contact the rubber tube 423 and intermittently extrude the rubber tube 423.

[0028] Please see Figures 6 to 8 , Figure 11 The nitrogen removal mechanism 40 also includes a pressure sealing assembly 45, which includes a pressure sealing block 451 fixedly mounted on the inner wall of the nitrogen removal shell 41. The pressure sealing block 451 has a ventilation channel 452 and a groove. An elastic rubber ring 454 is fixedly mounted in the groove. A pressure sealing plate 453 for blocking the ventilation channel 452 is fixedly connected to one side of the elastic rubber ring 454. The pressure sealing plate 453 has an exhaust port 455 for nitrogen removal. When the rubber tube 423 is periodically squeezed by the squeezing block 444, the tube volume shrinks instantaneously, forcing the nitrogen inside to be ejected at an accelerated speed, forming a pulsed airflow, which effectively enhances the nitrogen removal power and makes the residual nitrogen more thoroughly discharged from the adsorption tower 22. After the squeezing block 444 is released, the rubber tube 423 elastically rebounds and generates negative pressure, which can reverse the suction of residual gas in the adsorption tower 22, avoiding the decrease in oxygen purity caused by nitrogen retention.

[0029] Please see Figure 11 The ventilation channel 452 includes a first channel 4521 and a second channel 4522. The inner diameter of the first channel 4521 is larger than that of the second channel 4522. During the process of nitrogen gas flow through the ventilation channel 452, since the ventilation channel 452 is configured as a first channel 4521 and a second channel 4522, and the inner diameter of the first channel 4521 is larger than that of the second channel 4522, the inner diameters of the first channel 4521 and the second channel 4522 gradually decrease. When the nitrogen gas flow passes through the first channel 4521 and enters the smaller inner diameter of the second channel 4522, the flow rate of the gas will increase due to the smaller cross-sectional area, thereby effectively accelerating the flow rate of nitrogen and improving the exhaust efficiency of nitrogen.

[0030] Please see Figures 5 to 6 , Figure 9The nitrogen venting mechanism 40 also includes a protective baffle 46 fixedly mounted on one side of the nitrogen venting shell 41 for dust prevention; the sound-absorbing cotton 425 is made of porous polyurethane material; by making the sound-absorbing cotton 425 of porous polyurethane material, the porous polyurethane sound-absorbing cotton 425 can absorb and consume sound energy, thereby effectively reducing the propagation and vibration of sound.

[0031] Working principle: During the operation of the medical oxygen generation system, the compressed and cooled air is first introduced into the adsorption tower 22 through the air inlet pipe 12. The adsorption tower 22 is filled with molecular sieves. The molecular sieves have selective adsorption characteristics for nitrogen in the air, which can adsorb nitrogen and allow oxygen to pass through. The oxygen is then transported to the gas storage tank in the subsequent process through the oxygen delivery pipe 13 for user use. As the oxygen production system operates for an extended period, the molecular sieve inside the adsorption tower 22 will gradually reach saturation. At this point, it is necessary to decompress and release the nitrogen in the molecular sieve. The servo motor 31 is activated, and its output drives the first toothed disc 33 to rotate. The first toothed disc 33 is connected to the second toothed disc 34 via a transmission belt 35. Under the synergistic effect of the transmission belt 35, the second toothed disc 34 rotates accordingly, driving the rotating shaft 32 to rotate. The rotating shaft 32 then drives the rotating frame 21 and the adsorption tower 22 to rotate synchronously, thus achieving the switching of the positions of the two adsorption towers 22. After the switch, the adsorption tower 22 in good condition moves to the oxygen filtration area to continue adsorbing and producing oxygen, while the saturated adsorption tower 22 moves to the nitrogen removal mechanism 40 side for nitrogen desorption, forming a dual-tower alternating operation mode. This eliminates the intermittent nature of single-tower oxygen production, achieving continuous oxygen output and synchronous nitrogen discharge. When nitrogen purging is required, the adsorption tower 22 is depressurized, and then the drive fan 432 is started. The wind generated by the drive fan 432 passes through the ventilation channel 452 and acts directly on the sealing plate 453. Under the push of the wind, the inner wall of the sealing plate 453 and the sealing block 451 are relatively displaced, forming a gap between the sealing plate 453 and the sealing block 451, providing a channel for subsequent nitrogen discharge. In addition, when nitrogen purging is stopped, the drive fan 432 is stopped, and the elastic rubber ring 454 pulls the sealing plate 453 back to its original position through elastic force, sealing the ventilation channel 452 and the exhaust port 455, effectively preventing external dust and impurities from entering the system. During nitrogen decompression and release, after desorption from adsorption tower 22, the nitrogen enters the spiral conical nitrogen venting pipe 421 via nitrogen venting main pipe 14 and nitrogen venting connecting pipe 422. The spiral nitrogen venting pipe 421 has a tapered, gradually changing structure. When nitrogen enters the spiral conical nitrogen venting pipe, the tapered, gradually changing structure of the spiral nitrogen venting pipe 421 provides special guidance and constraint for the nitrogen flow inside the pipe, resulting in a corresponding increase in flow velocity. This helps to break the laminar flow state that may form in the pipe, making the nitrogen flow more uniform and sufficient. At the same time, several uniformly distributed... During the nitrogen flow process, the exhaust port 424 is used to divert the nitrogen gas, allowing the nitrogen gas to be discharged outward in an orderly manner through each exhaust port 424. This diversion mechanism effectively avoids the problem of uneven nitrogen gas discharge, ensuring that the nitrogen gas can be discharged from the adsorption tower 22 in a relatively balanced manner. Furthermore, when the evenly distributed exhaust ports 424 disperse the airflow into multiple streams, each stream of airflow is accelerated as it passes through the exhaust port 424 due to the reduced cross-sectional area, making the overall pressure distribution more balanced, preventing local airflow from being too fast or too slow, and improving nitrogen removal efficiency. In addition, since nitrogen gas generates noise during the emission process, porous polyurethane sound-absorbing cotton 425 is installed in the wall of the spiral nitrogen venting pipe 421. The porous polyurethane sound-absorbing cotton 425 can absorb and consume sound energy, thereby effectively reducing the propagation and vibration of sound. Furthermore, the spiral structure of the spiral nitrogen venting pipe 421 can effectively reduce the turbulence noise when nitrogen gas flows through at high speed. Combined with the porous polyurethane sound-absorbing cotton 425, the emission noise can be further reduced, thereby effectively reducing the noise generated during the nitrogen venting process, creating a relatively quiet operating environment for the oxygen generation system, and improving the overall user experience. Furthermore, during operation, the drive fan 432, through the coordinated action of the drive fan 432, the first rotating shaft 433, the reducer 435, and the second rotating shaft 436, causes the reducer 435 to drive the second rotating shaft 436 to rotate slowly. During this rotation, the second rotating shaft 436, via the extrusion rod 443, drives the extrusion block 444 to rotate within the open slot of the extrusion ring 441. As the extrusion block 444 moves within the open slot, it simultaneously contacts the rubber tube 423, intermittently extruding it. When the extrusion block 444 periodically extrudes the rubber tube 423, the tube volume contracts instantaneously, forcing the internal nitrogen gas to accelerate. The jetting creates a pulsed airflow, effectively enhancing the nitrogen removal power and allowing residual nitrogen to be more thoroughly discharged from the adsorption tower 22. After the extrusion block 444 is released, the elastic rebound of the rubber tube 423 generates negative pressure, which can reverse the suction of residual gas in the adsorption tower 22, preventing the oxygen purity from decreasing due to nitrogen retention. This structure also has a pressure buffering function; the elastic deformation of the rubber tube 423 can absorb the pressure fluctuations during nitrogen discharge, preventing the airflow impact from causing vibration or pulverization of the molecular sieve bed, extending the service life of the core components. Furthermore, the non-steady airflow generated by intermittent extrusion can disrupt the harmonic superposition of nitrogen discharge noise, reducing the sound pressure level and meeting the low-noise requirements of the medical environment.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A nitrogen removal device for a medical oxygen generation system, comprising a housing (10) and a fixed baffle (11) disposed within the housing (10), characterized in that: It also includes an adsorption assembly (20) and a nitrogen removal mechanism (40) disposed in the housing (10), and a conversion assembly (30) disposed on the fixed baffle (11); The nitrogen removal mechanism (40) includes a nitrogen removal shell (41) fixedly mounted on the housing (10). The nitrogen removal shell (41) is equipped with a drive assembly (43), a squeezing assembly (44) and a nitrogen removal assembly (42) from left to right inside. The nitrogen removal assembly (42) includes a spiral nitrogen removal pipe (421), and a nitrogen removal connecting pipe (422) is fixedly connected to the left end of the spiral nitrogen removal pipe (421). A deformable rubber tube (423) is installed on the nitrogen removal connecting pipe (422). Several evenly distributed exhaust holes (424) are opened on the pipe wall of the spiral nitrogen removal pipe (421). An inner cavity is opened in the pipe wall of the spiral nitrogen removal pipe (421), and a sound-absorbing cotton (425) for sound absorption and noise reduction is provided in the inner cavity. The spiral nitrogen removal pipe (421) makes the nitrogen gas flow form a stable vortex and evenly discharge along the spiral path through tapered gradual change and spiral flow guidance.

2. The nitrogen removal device for a medical oxygen generation system according to claim 1, characterized in that: The adsorption assembly (20) includes a rotating frame (21) assembled in the housing (10), two adsorption towers (22) are assembled on the rotating frame (21), and molecular sieves are provided in the adsorption towers (22). Ventilation connectors (23) for ventilation are fixedly assembled on the upper and lower sides of the two adsorption towers (22).

3. The nitrogen removal device for a medical oxygen generation system according to claim 2, characterized in that: An air inlet pipe (12) for transmitting air is fixedly installed inside the housing (10) and above the adsorption tower (22). One end of the air inlet pipe (12) is connected to the adsorption tower (22) through a vent connector (23). An oxygen supply pipe (13) and a nitrogen discharge pipe (14) are respectively installed inside the housing (10) and below the adsorption tower (22). The oxygen supply pipe (13) and the nitrogen discharge pipe (14) are both connected to the two adsorption towers (22) through vent connectors (23).

4. The nitrogen removal device for a medical oxygen generation system according to claim 1, characterized in that: The conversion assembly (30) includes a servo motor (31) fixedly mounted on a fixed baffle (11) and a rotating shaft (32) fixedly mounted on a rotating frame (21). A first gear (33) is fixedly mounted on the lower output end of the servo motor (31), and a second gear (34) is fixedly mounted on the rotating shaft (32). A transmission belt (35) is drivingly connected between the first gear (33) and the second gear (34).

5. The nitrogen removal device for a medical oxygen generation system according to claim 1, characterized in that: The drive assembly (43) includes a fixed frame (431) and a fixed bracket (434) fixedly mounted on the nitrogen exhaust shell (41). A drive fan (432) is fixedly mounted inside the fixed frame (431). A reducer (435) is fixedly mounted on the fixed bracket (434). A first rotating shaft (433) is fixedly mounted on one side of the drive fan (432). One end of the first rotating shaft (433) is fixedly connected to the reducer (435). A second rotating shaft (436) is fixedly connected to one side of the reducer (435) through its output end.

6. The nitrogen removal device for a medical oxygen generation system according to claim 5, characterized in that: The extrusion assembly (44) includes an extrusion ring (441) fixedly mounted on a nitrogen venting shell (41) and an extrusion sleeve (442) fixedly mounted on a second rotating shaft (436). An extrusion rod (443) is fixedly mounted on the outer wall of the extrusion sleeve (442). An extrusion block (444) is fixedly mounted on one end of the extrusion rod (443) away from the extrusion sleeve (442). An opening groove is provided on the inner wall of the extrusion ring (441), and the extrusion block (444) is located in the opening groove of the extrusion ring (441).

7. The nitrogen removal device for a medical oxygen generation system according to claim 1, characterized in that: The nitrogen venting mechanism (40) further includes a pressure sealing assembly (45), which includes a pressure sealing block (451) fixedly mounted on the inner wall of the nitrogen venting shell (41). The pressure sealing block (451) has a ventilation channel (452) and a groove. An elastic rubber ring (454) is fixedly mounted in the groove. A pressure sealing plate (453) for blocking the ventilation channel (452) is fixedly connected to one side of the elastic rubber ring (454). An exhaust port (455) for venting nitrogen gas is provided on the pressure sealing plate (453).

8. The nitrogen removal device for a medical oxygen generation system according to claim 7, characterized in that: The ventilation channel (452) includes a first channel (4521) and a second channel (4522), wherein the inner diameter of the first channel (4521) is larger than the inner diameter of the second channel (4522).

9. The nitrogen removal device for a medical oxygen generation system according to claim 1, characterized in that: The nitrogen removal mechanism (40) also includes a protective baffle (46) fixedly mounted on one side of the nitrogen removal shell (41) for dust prevention. The sound-absorbing cotton (425) is made of porous polyurethane material.

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