Pressure swing adsorption system for oxygen separation

Abstract

The application discloses an oxygen separation device for a pressure swing adsorption system and relates to the technical field of oxygen separation. The oxygen separation device for the pressure swing adsorption system comprises an oxygen separation tank, a central shaft arranged in the oxygen separation tank along the axial direction of the oxygen separation tank and capable of rotating around its own axis, and zeolite molecular sieves which are sleeved outside the central shaft and are uniformly distributed along the axial direction of the central shaft. An up-down transposition mechanism is arranged on the zeolite molecular sieves and can move synchronously with the rotation of the central shaft and is used for driving the zeolite particles to alternately change positions in the axial direction. The up-down transposition mechanism which moves synchronously with the rotating drum is arranged to drive the zeolite particles to continuously and orderly change positions in the axial direction, realize dynamic circulation replacement of the adsorption area, make the zeolite particles at different positions alternately participate in the adsorption process, effectively balance the loads of the areas, and prevent local premature failure.

Description

Technical Field

[0001] This invention relates to the field of oxygen separation technology, specifically to an oxygen separation device for a pressure swing adsorption system. Background Technology

[0002] Pressure swing adsorption (PSA) is a physical separation technology based on the selective adsorption of gases on the surface of porous adsorbents. By periodically changing the pressure, it achieves efficient separation of different components in the air and is widely used in industrial gas separation (such as oxygen production) and natural gas purification. In oxygen production applications, the preferential adsorption characteristics of zeolite molecular sieves for nitrogen can be utilized. When pressurized, nitrogen is adsorbed, and oxygen is collected as unadsorbed gas; when depressurized, nitrogen is desorbed, and the adsorbent is regenerated, thereby achieving continuous separation and purification of oxygen.

[0003] However, existing oxygen separation devices still have the following problems:

[0004] 1. Most pressure swing adsorption (PSA) oxygen separation devices adopt a single fixed structure, in which zeolite molecular sieves are filled into adsorption towers of the same size, and the particle size distribution is uniform and the position is fixed. Although this structure is simple and easy to implement, it has significant defects: after compressed air enters, laminar or eccentric flow is easily formed, especially in the bottom inlet area where concentrated airflow impact often occurs, leading to local adsorption overload, while the utilization rate of particles at higher levels is low, forming an unbalanced adsorption phenomenon of "saturated front end and idle back end". At the same time, since the zeolite particles are stationary, long-term operation is prone to caking or channeling, resulting in decreased mass transfer efficiency, increased pressure drop, and affecting oxygen purity and system stability.

[0005] 2. In addition, although some improved structures have introduced a rotating design to improve airflow distribution, the zeolite particles tend to aggregate towards the periphery due to the influence of centrifugal force during operation, resulting in loose particles in the central area or even the formation of cavities, which causes airflow short-circuiting. At the same time, the airflow is prone to forming eddies or circumferential shear in the rotating field, causing disordered airflow distribution and uneven contact between airflow and particles. Furthermore, the particles are in a state of segregation for a long time, and there are still problems of premature local saturation and low overall utilization. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an oxygen separation device for pressure swing adsorption systems, which solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an oxygen separation device for a pressure swing adsorption system, comprising: an oxygen separation tank; a central shaft, which is arranged axially inside the oxygen separation tank and is capable of rotating around its own axis; a zeolite molecular sieve, which is sleeved on the outside of the central shaft and uniformly distributed along the central shaft axis, with zeolite particles disposed between adjacent zeolite molecular sieves for selectively adsorbing nitrogen components in the air; and an upper and lower displacement mechanism, which is disposed on the zeolite molecular sieves and can move synchronously with the rotation of the central shaft to drive the zeolite particles to alternate positions axially.

[0008] Furthermore, the upper and lower switching mechanism includes multiple mounting grooves evenly distributed along the circumference of the zeolite molecular sieve. An annular outer shaft penetrating the mounting groove is installed inside the zeolite molecular sieve, and a rotating inner shaft is rotatably installed inside the mounting groove. A circulating moving belt is connected between the annular outer shaft and the rotating inner shaft, and the circulating moving belt has uniformly distributed ventilation holes.

[0009] Furthermore, the circulating moving belt is provided with uniformly distributed grooves, and a molecular sieve slider is slidably arranged in the grooves. The zeolite molecular sieve is provided with a guide frame for restricting the movement path of the molecular sieve slider, so that the molecular sieve slider located on the downward side of the circulating moving belt moves towards the middle part, and the molecular sieve slider located on the upward side moves towards both sides.

[0010] Furthermore, the inner wall of the rotating inner shaft is provided with oblique tooth grooves, and a rotating toothed ring located inside the rotating inner shaft is rotatably installed inside the zeolite molecular sieve. The upper end of the rotating toothed ring is equipped with mating teeth that mesh with the oblique tooth grooves. A transmission gear that is rotatably connected to the zeolite molecular sieve is meshed on the inner side of the rotating toothed ring, and a central gear that meshes with the transmission gear is fixedly fitted on the outer side of the central shaft.

[0011] Furthermore, the upper and lower switching mechanism includes sector-shaped molecular sieves disposed on the upper and lower sides of the zeolite molecular sieve, the sector-shaped molecular sieves being rotatably connected to the zeolite molecular sieves and fixedly connected to the central shaft.

[0012] Furthermore, the upper and lower switching mechanism includes a spiral molecular sieve disposed on the upper and lower sides of the zeolite molecular sieve, the spiral molecular sieve being rotatably connected to the zeolite molecular sieve and fixedly connected to the central shaft.

[0013] Furthermore, the oxygen separator is equipped with multiple rotating cylinders, which are arranged coaxially from top to bottom with decreasing diameters. The rotating cylinders are rotatably connected to the inner wall of the oxygen separator. The size of the zeolite particles in each rotating cylinder increases sequentially from top to bottom, forming a gradient particle distribution structure.

[0014] Furthermore, the adjacent zeolite molecular sieves are connected by support columns, and fixed columns that are fixedly connected to the oxygen separator are installed on both the uppermost and lowermost zeolite molecular sieves. The circumferentially distributed fixed columns are connected to the same transition ring. A rotating frame that is rotatably connected to the transition ring is fixedly fitted at the end of the central shaft. A transition gear is rotatably installed inside the transition ring. An external toothed ring that meshes with the transition gear is fitted on the outside of the rotating frame. An internal toothed ring that meshes with the transition gear is fixedly installed on the inner wall of the rotating cylinder. A connecting toothed ring is fixedly fitted on the outside of the rotating cylinder in the middle. A rotating gear meshes on the outside of the connecting toothed ring. The rotating gear is connected to the output shaft of the drive motor.

[0015] Furthermore, the oxygen separator has an oxygen outlet at the upper end and an air inlet at the lower end; an air inlet ring is fixedly connected to the corresponding rotating drum inside the air inlet, and a lifting circular plate is installed inside the air inlet ring. The lifting circular plate has evenly distributed air outlet pipes. Except for the air outlet pipe located in the center, each of the other air outlet pipes has a base fixedly connected to the lifting circular plate on both sides. The air outlet pipe is hinged to the corresponding base by a pin, and the pin and the base slide vertically. A crossbar connects the inner and outer adjacent bases. A pull rod hinged to the outermost pin is hinged to the air inlet ring; the inner surface of the air inlet ring has a spiral groove connected end to end, and a sliding column that slides with the spiral groove is installed on the outer side of the lifting circular plate.

[0016] Furthermore, the outer side of the rotating drum is equipped with evenly distributed protrusions, and the inner wall of the oxygen separator is provided with evenly distributed grooves that cooperate with the protrusions.

[0017] The present invention has the following beneficial effects:

[0018] (1) The oxygen separation device of the pressure swing adsorption system uses a rotating drum that can rotate circumferentially, so that the incoming compressed air can achieve radial uniform diffusion under the synergistic effect of centrifugal force and rotating airflow, effectively breaking the laminar boundary, preventing the airflow from accumulating in the center or edge area, significantly improving the uniformity of gas distribution in the adsorption layer. At the same time, the rotation of the drum can also drive the zeolite particles inside to move circumferentially, promoting the dynamic dispersion of zeolite particles, avoiding local accumulation or retention, further improving the overall utilization rate of zeolite particles, and ensuring the stability and continuity of the oxygen separation process.

[0019] (2) The oxygen separation device of the pressure swing adsorption system drives the zeolite particles to continuously and orderly alternate positions in the axial direction by setting up an up-and-down switching mechanism that moves synchronously with the rotating drum. This achieves dynamic cyclic replacement of the adsorption area, allowing zeolite particles at different positions to participate in the adsorption process alternately, effectively balancing the load of each area, preventing premature failure of local areas, improving the overall utilization efficiency of zeolite particles and the stability of oxygen separation, and avoiding problems such as particle agglomeration, channeling or local caking caused by centrifugal force or airflow disturbance during the rotation of the rotating drum and the flow of air.

[0020] (3) The oxygen separation device of the pressure swing adsorption system is set up with a rotating drum with a gradually decreasing diameter from top to bottom. Combined with the distribution of zeolite particles with a size ranging from small to large, a synergistic gradient of airflow velocity and adsorption capacity is formed. The airflow velocity in the upper large diameter area is low and the residence time is long, which is conducive to the small zeolite particles to take advantage of their high specific surface area and achieve efficient initial capture of nitrogen. The airflow acceleration in the lower small diameter area is limited. Using large zeolite particles can reduce pressure drop and energy consumption, while enhancing the interparticle support force and preventing pulverization and collapse caused by compressed airflow.

[0021] (4) The oxygen separation device of the pressure swing adsorption system uses an outlet pipe that can rotate, lift and swing, so that compressed air enters the rotating drum in a dynamic sweeping manner. This not only avoids local penetration caused by concentrated airflow impact, but also promotes uniform distribution of gas on the cross-section of the adsorption layer through periodic sweeping action, reducing flow deviation and dead zone.

[0022] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a partial structural diagram of the oxygen separator and rotating drum in this invention;

[0025] Figure 3 This is a partial cross-sectional view of the oxygen separator in this invention;

[0026] Figure 4 This is a partial cross-sectional view of the rotating cylinder in this invention;

[0027] Figure 5 This is a schematic diagram of the structure of the intake ring, the lifting circular plate, and the exhaust pipe in this invention;

[0028] Figure 6 This is a partial cross-sectional view of the intake ring and the lifting circular plate in this invention;

[0029] Figure 7This is a schematic diagram of the intake ring and spiral groove in this invention;

[0030] Figure 8 This is a partial structural diagram of the rotating shaft, rotating frame, and transition ring in this invention;

[0031] Figure 9 This is a partial cross-sectional view of the zeolite molecular sieve and the upper and lower transposition mechanism in Embodiment 1 of the present invention.

[0032] Figure 10 This is a bottom view of the vertical switching mechanism in Embodiment 1 of the present invention.

[0033] Figure 11 This is a partial structural diagram of the annular outer shaft, the rotating inner shaft, and the rotating gear in Embodiment 1 of the present invention;

[0034] Figure 12 This is a schematic diagram of the transmission gear and rotating gear ring in Embodiment 1 of the present invention;

[0035] Figure 13 This is a schematic diagram of the upper and lower switching mechanism in Embodiment 2 of the present invention;

[0036] Figure 14 This is a schematic diagram of the upper and lower switching mechanism in Embodiment 3 of the present invention.

[0037] In the diagram, 1. Oxygen separator; 11. Rotary drum; 111. Partition screen; 12. Inlet ring; 121. Lifting disc; 122. Spiral groove; 123. Sliding column; 124. Outlet pipe; 125. Base; 126. Tie rod; 13. Central shaft; 14. Zeolite molecular sieve; 15. Support column; 16. Fixed column; 17. Up and down switching mechanism; 171. Mounting groove; 172. Annular outer shaft; 173. Circulating moving belt; 174. Rotating inner shaft; 175. Separator 176. Sub-sieve slider; 177. Guide frame; 178. Inclined toothed groove; 179. Rotating toothed ring; 180. Mating tooth; 181. Transmission gear; 182. Central gear; 183. Sector-shaped molecular sieve; 184. Spiral molecular sieve; 19. Transition ring; 195. Rotating frame; 196. Transition gear; 197. External toothed ring; 198. Internal toothed ring; 199. Connecting toothed ring; 190. Rotating gear; 191. Drive motor; 192. Protrusion; 193. Groove. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0040] The following is based on Figures 1-14 This invention describes an oxygen separation device for a pressure swing adsorption system provided in an embodiment of the present invention.

[0041] Example 1, please refer to this example. Figures 1-12 Please refer to Figure 1 This invention provides an oxygen separation device for a pressure swing adsorption (PSA) system, which can be applied to an oxygen production system. The oxygen production system includes an air compressor, a compressed air dryer, an oxygen separation device, and an oxygen storage tank connected sequentially via an air path. The air compressor pressurizes ambient air to provide a power source for subsequent separation; the compressed air dryer removes moisture from the compressed air to prevent water vapor from affecting adsorption performance; the oxygen separation device, as the core separation unit, is used to adsorb nitrogen from the compressed air to obtain high-purity oxygen; and the oxygen storage tank is used to store the separated oxygen.

[0042] For details, please refer to Figure 1 and Figure 2 The aforementioned oxygen separation device includes an oxygen separation tank 1. The oxygen separation tank 1 has an air inlet at the lower end, an oxygen outlet at the upper end, and an exhaust gas outlet on the outer side. The air inlet is connected to a compressed air dryer through an air inlet pipe, the oxygen outlet is connected to an oxygen storage tank through an oxygen outlet pipe, and the exhaust gas outlet is connected to an exhaust gas collection device (not shown in the figure). The exhaust gas collection device is used to collect and discharge the nitrogen-rich gas discharged during the adsorption stage to prevent backflow from affecting the oxygen purity of the product.

[0043] Please refer to Figure 2 and Figure 4 The oxygen separator 1 contains multiple fixedly connected rotating cylinders 11. Each rotating cylinder 11 is coaxially arranged from top to bottom with a decreasing diameter. The rotating cylinders 11 are rotatably connected to the inner wall of the oxygen separator 1. The size of the zeolite particles in each rotating cylinder 11 increases sequentially from top to bottom, forming a gradient particle distribution structure. The zeolite particles are used as an adsorbent to selectively adsorb nitrogen components in the air. A partition net 111 is provided between adjacent rotating cylinders 11 to isolate zeolite particles of different sizes. The rotating cylinder 11 itself is made of porous molecular sieve material, which has both support and adsorption functions. At the same time, its porous structure allows gas to pass through smoothly without obstructing the flow of exhaust gas, making it convenient for exhaust gas to enter the exhaust gas collection device for centralized discharge.

[0044] The airflow flows from bottom to top, first passing through the lower section of the small-diameter rotating cylinder 11. This section of the rotating cylinder 11 has a small cross-section and a relatively high gas velocity. Combined with large-sized zeolite particles, it has a high particle packing density and structural stability, which can effectively reduce airflow resistance and pressure drop, while avoiding fine powder blockage and channeling, ensuring smooth airflow. Subsequently, the airflow enters the upper section of the large-diameter rotating cylinder 11, where the flow area expands, the airflow velocity decreases, and the residence time is extended. Combined with the high specific surface area of ​​the small-sized zeolite particles, it is conducive to the full and deep adsorption of residual nitrogen, improving separation accuracy and oxygen purity.

[0045] Furthermore, the rotating drum 11 can rotate circumferentially, which drives the internal airflow to form a uniform radial diffusion, effectively breaking the laminar boundary and preventing the airflow from accumulating in the center or edge area. This significantly improves the uniformity of gas distribution within the adsorption layer and enhances the mass transfer efficiency between the gas and zeolite particles. At the same time, the rotation of the rotating drum 11 can also drive the zeolite particles to move circumferentially, promoting the dynamic dispersion of the zeolite particles, avoiding local accumulation or retention, further improving the overall utilization rate of the zeolite particles, and ensuring the stability and continuity of the oxygen separation process.

[0046] Please refer to Figures 4-7 To improve the uniformity of raw material air entering the rotating drum 11 from the air inlet and expand the airflow diffusion area, an air inlet ring 12 is provided inside the air inlet and is fixedly connected to the corresponding rotating drum 11. A lifting circular plate 121 is provided inside the air inlet ring 12. A spiral groove 122 with the ends connected is opened on the inner ring surface of the air inlet ring 12. A sliding column 123 that slides in cooperation with the spiral groove 122 is installed on the outer side of the lifting circular plate 121. When the rotating drum 11 drives the air inlet ring 12 to rotate, the sliding column 123 slides continuously along the spiral groove 122, driving the lifting circular plate 121 to achieve periodic up and down reciprocating motion.

[0047] Furthermore, the lifting circular plate 121 is provided with evenly distributed air outlet pipes 124. The air outlet pipes 124 can rise and fall synchronously with the lifting circular plate 121. Except for the air outlet pipe 124 located in the center, each of the other air outlet pipes 124 has a base 125 fixedly connected to the lifting circular plate 121 on both sides. The air outlet pipe 124 is hinged to the corresponding base 125 through a pin, and the pin and the base 125 slide up and down. A crossbar is connected between the inner and outer adjacent bases 125. A pull rod 126 hinged to the outermost pin is hinged to the air intake ring 12.

[0048] Since the axial position of the air intake ring 12 is fixed, the lifting disc 121 pulls the pin shaft through the pull rod 126 during the lifting process, thereby driving the air outlet pipe 124 to swing back and forth around the hinge point. At the same time, the lifting disc 121 rotates synchronously with the air intake ring 12, so that the air outlet pipe 124 can perform axial lifting and radial swing while rotating in the circumferential direction, forming a multi-dimensional dynamic air outlet mode, effectively dispersing the airflow bundle, promoting the uniform distribution of air in the rotating drum 11, and improving the airflow uniformity and mass transfer efficiency of the adsorption layer.

[0049] In addition, please refer to Figure 4 and Figure 8 A central shaft 13 is arranged axially inside the rotating drum 11. The central shaft 13 can rotate synchronously with the rotating drum 11. Multiple zeolite molecular sieves 14 are rotatably sleeved on the outside of the central shaft 13. The zeolite molecular sieves 14 are evenly distributed axially. Support columns 15 connect adjacent zeolite molecular sieves 14. The mesh 111 is also fixedly connected to the zeolite molecular sieves 14 through the support columns 15. Fixed columns 16 that are fixedly connected to the oxygen separator 1 are installed on the uppermost and lowermost zeolite molecular sieves 14, forming a static support frame. When the central shaft 13 rotates synchronously with the rotating drum 11, the zeolite molecular sieves 14 remain stationary, while the rotating drum 11 rotates around its outside. The stationary zeolite molecular sieves 14 divide and limit the zeolite particles inside, and at the same time play an adsorption function to ensure that nitrogen is effectively adsorbed and oxygen passes smoothly, thereby improving the separation efficiency.

[0050] It should be noted that the pore sizes of the zeolite molecular sieve 14 and the aforementioned partition mesh 111 are matched according to the size of the zeolite particles in the rotating drum 11, ensuring that the zeolite particles are effectively confined within their respective rotating drum 11 areas. This allows gas to pass freely while preventing zeolite particles from different levels from communicating or migrating with each other, thus maintaining the independence of each adsorption zone and the stability of the gradient structure.

[0051] Please refer to Figure 4 To improve the uniformity of zeolite particle distribution within the rotating drum 11, prevent uneven utilization due to local over-adsorption or airflow deviation, and avoid particle agglomeration or uneven flow during the rotation of the rotating drum 11 and airflow, an upper and lower displacement mechanism 17 is provided on the zeolite molecular sieve 14. The upper and lower displacement mechanism 17 can move synchronously with the rotation of the central shaft 13, driving the zeolite particles to continuously alternate positions in the axial direction during the adsorption process, realizing the dynamic cyclic replacement of zeolite particles, allowing zeolite particles from different regions to participate in the adsorption process alternately, effectively balancing the load of each region, preventing premature local failure, and improving the overall utilization efficiency of the adsorption layer and the stability of oxygen separation.

[0052] For details, please refer to Figures 9-11The upper and lower switching mechanism 17 includes multiple mounting grooves 171 evenly distributed around the circumference of the zeolite molecular sieve 14. An annular outer shaft 172, penetrating the mounting grooves 171, is installed inside the zeolite molecular sieve 14. A rotating inner shaft 174 is rotatably mounted within the mounting grooves 171. A circulating moving belt 173 connects the annular outer shaft 172 and the rotating inner shaft 174. The circulating moving belt 173 can circulate around the annular outer shaft 172 and the rotating inner shaft 174. The circulating moving belt 173 has evenly distributed ventilation holes. These holes ensure smooth gas flow during adsorption, reduce pressure drop in the adsorption layer, and assist in moving zeolite particles, preventing particle accumulation or localized stagnation. It should be noted that the circulating moving belt 173 is supported by a flexible material, which avoids wear or breakage of the zeolite particles due to rigid contact during operation, thus protecting the structural integrity of the zeolite particles.

[0053] To compensate for localized filling gaps caused by zeolite particle displacement during the operation of the circulating moving belt 173 and to ensure the continuity and uniformity of the adsorption layer, uniformly distributed grooves are provided on the circulating moving belt 173. Molecular sieve sliders 175 are slidably mounted within these grooves. A guide frame 176 is provided on the zeolite molecular sieve 14 to restrict the movement path of the molecular sieve sliders 175. The upper guide frame 176 has an inverted triangular end, which guides the downward-moving molecular sieve sliders 175 inwards. The lower guide frame 176... The ends of the 6-section open outwards, pushing the upward molecular sieve slider 175 to unfold to both sides. During the operation of the circulating moving belt 173, the downward molecular sieve slider 175 moves towards the center under the action of the guide frame 176, covering the empty area formed after the zeolite particles move. At the same time, the upward molecular sieve slider 175 moves to both sides, achieving misalignment and avoidance with the downward molecular sieve slider 175, so that the molecular sieve sliders 175 are staggered and dynamically fill the gaps in the displacement process of the zeolite particles, maintaining effective adsorption when the airflow passes through.

[0054] Please refer to Figure 11 and Figure 12 To achieve synchronous linkage between the multiple circumferentially distributed circulating moving belts 173 and the central shaft 13, a helical tooth groove 177 is provided on the inner wall of the rotating inner shaft 174. A rotating toothed ring 178 located inside the rotating inner shaft 174 is rotatably installed inside the zeolite molecular sieve 14. The upper end of the rotating toothed ring 178 is equipped with a mating tooth 179 that meshes with the helical tooth groove 177. A transmission gear 180 that is rotatably connected to the zeolite molecular sieve 14 is meshed on the inner side of the rotating toothed ring 178. A central gear 181 that meshes with the transmission gear 180 is fixedly fitted on the outer side of the central shaft 13.

[0055] During operation, the rotation of the central shaft 13 drives the central gear 181 to rotate, which in turn drives the transmission gear 180 to rotate around its own axis, thereby driving the rotating gear ring 178 to rotate synchronously. During the rotation, the rotating gear ring 178 transmits the rotational motion to the rotating inner shaft 174 through the meshing of the mating teeth 179 and the helical groove 177, causing it to rotate around its own axis, thereby driving the circulating moving belt 173 connected to it to run, ensuring that each circulating moving belt 173 moves in a coordinated manner in the circumferential direction, and ensuring the continuous and uniform replacement of zeolite particles in the axial direction.

[0056] Please refer to point 2. Figure 4 and Figure 8 To achieve synchronous rotation of the rotating drum 11 and the central shaft 13, the circumferentially distributed fixed columns 16 are connected together to the same transition ring 19. The transition ring 19 and the fixed columns 16 are fixed together to the inner wall of the oxygen separator 1 and remain stationary. A rotating frame 191 that is rotatably connected to the transition ring 19 is fixedly fitted at the end of the central shaft 13. A transition gear 192 is rotatably installed inside the transition ring 19. An external gear ring 193 that meshes with the transition gear 192 is fitted on the outside of the rotating frame 191. An internal gear ring 194 that meshes with the transition gear 192 is fixedly installed on the inner wall of the rotating drum 11. A connecting gear ring 195 is fixedly fitted on the outside of the rotating drum 11 in the middle. A rotating gear 196 that is rotatably connected to the oxygen separator 1 meshes on the outside of the connecting gear ring 195. The rotating gear 196 is connected to the output shaft of the drive motor 197. The drive motor 197 is installed on the inner wall of the oxygen separator 1.

[0057] During operation, the drive motor 197 drives the rotating gear 196 to rotate, thereby causing the connecting gear ring 195 and the rotating drum 11 to rotate synchronously. The rotating drum 11 drives the transition gear 192 to rotate around its own axis through the inner gear ring 194. The transition gear 192 simultaneously meshes with the outer gear ring 193, driving it to rotate synchronously, which in turn drives the rotating frame 191 and the central shaft 13 to rotate synchronously.

[0058] Please refer to Figure 2 and Figure 3 To improve the uniformity of airflow and zeolite particle distribution inside the rotating drum 11, uniformly distributed protrusions 198 are installed on the outside of the rotating drum 11. The protrusions 198 have a certain elastic deformation capability. The inner wall of the oxygen separator 1 is provided with uniformly distributed grooves 199 that cooperate with the protrusions 198. When the rotating drum 11 rotates, the protrusions 198 successively engage with the grooves 199 on the inner wall of the oxygen separator 1. During the entry and exit process, slight elastic deformation occurs, accompanied by slight impact and local vibration. This vibration is transmitted through the wall of the rotating drum 11 to its internal adsorption layer, which can effectively prevent zeolite particles from adhering to the inner wall of the rotating drum 11, promote particle loosening and uniform dispersion, and at the same time help release the internal air resistance of the adsorption layer and improve the uniformity of airflow penetration.

[0059] In practical use (operation), compressed and purified compressed air enters the bottom of the oxygen separator 1 through the air inlet. The airflow is output upward through the air outlet pipe 124 on the lifting circular plate 121 within the air inlet ring 12. At this time, the drive motor 197 drives the rotating gear 196 to rotate, and the connecting gear ring 195 drives the rotating drum 11 to rotate synchronously. The air outlet pipe 124 moves up and down reciprocally under the cooperation of the spiral groove 122 and the sliding column 123, and rotates with the rotating drum 11. Under the action of the pull rod 126, the airflow enters the interior of the rotating drum 11 evenly in a compound manner of rotation, lifting, and oscillation. The airflow passes through the multi-stage rotating drum 11 with decreasing diameter from bottom to top. The lower small-diameter area has high particle density and large particle size, which enhances adsorption stability and reduces air resistance. The upper large-diameter area has a high flow velocity. The system has a low density and, in conjunction with small-diameter zeolite particles and zeolite molecular sieve 14, achieves efficient adsorption of nitrogen. In addition, the rotating drum 11 drives the central shaft 13 to rotate through the internal gear ring 194, transition gear 192, external gear ring 193 and rotating frame 191. The central shaft 13 is driven by the central gear 181, transmission gear 180, rotating gear ring 178, mating gear 179 and helical groove 177, which drives the rotating inner shaft 174 to rotate, thereby driving the circulating moving belt 173 to run, realizing the continuous up and down displacement of zeolite particles in the axial direction. The separated oxygen is discharged from the top oxygen outlet and enters the oxygen storage tank for storage. When the oxygen storage process is completed, the system switches to the desorption state. The incompletely adsorbed nitrogen and residual waste gas are discharged into the waste gas collection device through the waste gas outlet for centralized treatment and emission.

[0060] Example 2, please refer to this example. Figure 13 The difference between this embodiment and Embodiment 1 is that the upper and lower displacement mechanism 17 here includes sector-shaped molecular sieves 182 disposed on the upper and lower sides of the zeolite molecular sieve 14. The sector-shaped molecular sieves 182 are rotatably connected to the zeolite molecular sieve 14 and fixedly connected to the central shaft 13. The sector-shaped molecular sieves 182 can rotate synchronously with the central shaft 13. During the rotation, the sector-shaped molecular sieves 182 periodically cut into the upper and lower regions, pushing the zeolite particles to alternately replace each other on both sides of the axial direction, thereby realizing the dynamic updating of the position of the zeolite particles. It should be noted that the sector-shaped molecular sieves 182 are made of flexible material, which can avoid causing mechanical damage to the zeolite particles when pushing them. Furthermore, the sector-shaped molecular sieves 182 will not obstruct or significantly disturb the airflow channel, ensuring smooth gas flow during the adsorption process.

[0061] Example 3, please refer to this example. Figure 14The difference between this embodiment and the two embodiments mentioned above is that the upper and lower displacement mechanism 17 here includes spiral molecular sieves 183 disposed on the upper and lower sides of the zeolite molecular sieve 14. The spiral molecular sieves 183 are rotatably connected to the zeolite molecular sieve 14 and fixedly connected to the central shaft 13. The spiral molecular sieves 183 can rotate synchronously with the central shaft 13. During rotation, the spiral molecular sieves 183 apply axial thrust to the zeolite particles using their spiral curved surface structure, guiding the particles to move continuously along the spiral path, realizing the orderly replacement of particles in the upper and lower regions, effectively improving the uniformity and cycle stability of the adsorption layer. It should be noted that the spiral molecular sieves 183 are supported by flexible materials, which can alleviate contact stress during the transport of zeolite particles, avoiding wear or breakage. Furthermore, the spiral molecular sieves 183 do not obstruct the airflow channel or generate significant flow resistance, ensuring smooth gas passage during the adsorption stage.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An oxygen separation device for a pressure swing adsorption system, characterized in that, include: Oxygen separator (1); A central shaft (13) is disposed inside the oxygen separator (1) along the axial direction therein and is capable of rotating about its own axis; Zeolite molecular sieve (14), the zeolite molecular sieve (14) is sleeved on the outside of the central shaft (13) and is evenly distributed along the central shaft (13). Zeolite particles are arranged between adjacent zeolite molecular sieves (14) for selective adsorption of nitrogen components in the air. The upper and lower switching mechanism (17) is set on the zeolite molecular sieve (14) and can move synchronously with the rotation of the central shaft (13) to drive the zeolite particles to alternate positions in the axial direction. The upper and lower switching mechanism (17) includes multiple mounting grooves (171) evenly distributed around the circumference of the zeolite molecular sieve (14). An annular outer shaft (172) penetrating the mounting groove (171) is installed inside the zeolite molecular sieve (14). A rotating inner shaft (174) is rotatably installed inside the mounting groove (171). A circulating moving belt (173) is connected between the annular outer shaft (172) and the rotating inner shaft (174). The circulating moving belt (173) has uniformly distributed ventilation holes. The circulating moving belt (173) is provided with uniformly distributed grooves, and a molecular sieve slider (175) is slidably arranged in the grooves. The zeolite molecular sieve (14) is provided with a guide frame (176) for restricting the movement path of the molecular sieve slider (175), so that the molecular sieve slider (175) located on the downward side of the circulating moving belt (173) moves towards the middle part, and the molecular sieve slider (175) located on the upward side moves towards both sides.

2. The oxygen separation device for a pressure swing adsorption system according to claim 1, characterized in that, The inner wall of the rotating inner shaft (174) is provided with a helical tooth groove (177). A rotating toothed ring (178) located inside the rotating inner shaft (174) is rotatably installed inside the zeolite molecular sieve (14). The upper end of the rotating toothed ring (178) is provided with a mating tooth (179) that meshes with the helical tooth groove (177). A transmission gear (180) that is rotatably connected to the zeolite molecular sieve (14) is meshed on the inner side of the rotating toothed ring (178). A central gear (181) that meshes with the transmission gear (180) is fixedly fitted on the outer side of the central shaft (13).

3. The oxygen separation device for a pressure swing adsorption system according to claim 1 or 2, characterized in that, The oxygen separator (1) is provided with multiple rotating cylinders (11), each rotating cylinder (11) is arranged coaxially from top to bottom and the diameter decreases sequentially, and the rotating cylinder (11) is rotatably connected to the inner wall of the oxygen separator (1); The size of the zeolite particles in each of the rotating cylinders (11) increases sequentially from top to bottom, forming a gradient particle distribution structure.

4. The oxygen separation device for a pressure swing adsorption system according to claim 3, characterized in that, A support column (15) connects the upper and lower adjacent zeolite molecular sieves (14). A fixed column (16) that is fixedly connected to the oxygen separator (1) is installed on both the uppermost and lowermost zeolite molecular sieves (14). The circumferentially distributed fixed columns (16) are connected to the same transition ring (19). The end of the central shaft (13) is fixedly fitted with a rotating frame (191) that is rotatably connected to the transition ring (19). A transition gear (192) is rotatably installed inside the transition ring (19). An external toothed ring (193) that meshes with the transition gear (192) is fitted on the outside of the rotating frame (191). An internal toothed ring (194) that meshes with the transition gear (192) is fixedly installed on the inner wall of the rotating cylinder (11). A connecting gear ring (195) is fixedly fitted on the outer side of the rotating drum (11) located in the middle. A rotating gear (196) meshes on the outer side of the connecting gear ring (195). The rotating gear (196) is connected to the output shaft of the drive motor (197).

5. The oxygen separation device for a pressure swing adsorption system according to claim 4, characterized in that, The oxygen separator (1) is provided with an oxygen outlet at the upper end and an air inlet at the lower end; An air intake ring (12) is fixedly connected to the corresponding rotating cylinder (11) inside the air intake port. A lifting circular plate (121) is provided inside the air intake ring (12). The lifting circular plate (121) is provided with evenly distributed air outlet pipes (124). Except for the air outlet pipe (124) located in the center, each of the other air outlet pipes (124) is provided with a base (125) fixedly connected to the lifting circular plate (121) on both sides. The air outlet pipe (124) is hinged to the corresponding base (125) through a pin, and the pin and the base (125) slide up and down. A crossbar is connected between the inner and outer adjacent bases (125). A pull rod (126) is hinged to the outermost pin and is hinged to the air intake ring (12). The inner surface of the intake ring (12) is provided with a spiral groove (122) that is connected end to end, and a sliding column (123) that slides in cooperation with the spiral groove (122) is installed on the outer side of the lifting plate (121).

6. The oxygen separation device for a pressure swing adsorption system according to claim 4, characterized in that, The outer side of the rotating drum (11) is equipped with evenly distributed protrusions (198), and the inner wall of the oxygen separator (1) is provided with evenly distributed grooves (199) that cooperate with the protrusions (198).

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