Integrated pressure swing adsorption nitrogen generator

Abstract

The application belongs to the technical field of pressure swing adsorption nitrogen making machine, in particular to an integrated pressure swing adsorption nitrogen making machine, which comprises a pair of lifting flow channels and an intermittent material moving module, the pair of lifting flow channels are symmetrically arranged in the adsorption tank, the intermittent material moving module is arranged at the bottom of the adsorption tank, the lifting flow channels are arranged between the intermittent material moving module and the inner wall of the adsorption tank, the intermittent material moving module is used for separating the internal space of the adsorption tank into a filling cavity and a shunt cavity, and controlling the carbon molecular sieve to move from the bottom of the filling cavity to the top of the filling cavity, through the synergistic effect of the lifting flow channels arranged in the adsorption tank and the intermittent material moving module, the axial circulation and dynamic position updating of the carbon molecular sieve are realized, the axial migration of the carbon molecular sieve is continuously carried out in the running, the problem of the overload failure of the bottom carbon molecular sieve caused by the uneven airflow distribution in the traditional fixed bed is effectively avoided, and the service life of the overall carbon molecular sieve is significantly prolonged.

Description

Technical Field

[0001] This invention belongs to the field of pressure swing adsorption nitrogen generator technology, specifically an integrated pressure swing adsorption nitrogen generator. Background Technology

[0002] Traditional integrated pressure swing adsorption (PSA) nitrogen generators rely primarily on carbon molecular sieves filled in the adsorption tank to adsorb oxygen. However, the adsorption tank is typically arranged vertically with airflow entering from the bottom up. This results in the lower layer of adsorbent always coming into contact with high concentrations of oxygen and impurities first, causing its degradation rate to be significantly faster than that of the upper layer. This uneven degradation necessitates differentiated replacement cycles for the carbon molecular sieves in different locations, thereby increasing maintenance complexity.

[0003] Chinese patent CN119281056A discloses an internal circulation waste gas reuse nitrogen production device, including a base, a top plate fixed to the top of the base, two adsorption towers fixed to the top surface of the top plate, an air inlet network connected to the outer sides of the two adsorption towers, a gas collection tank fixed to the top of the top plate, and a conveying mechanism inside the adsorption tower. The conveying mechanism includes a feed cylinder fixed to the inner side of the adsorption tower, and an auger rotating inside the feed cylinder. The auger conveys carbon molecular sieves from the bottom of the adsorption tower to the top of the adsorption tower. By changing the position of the carbon molecular sieves inside the adsorption tower, the carbon molecular sieves at different positions can uniformly and fully adsorb oxygen from the air to produce nitrogen.

[0004] The aforementioned patent discloses a screw conveyor-based system for transferring carbon molecular sieves from the bottom to the top of the adsorption tower. This system forces the carbon molecular sieves within the adsorption tower to maintain a relatively uniform lifespan, enabling overall replacement rather than partial replacement during maintenance and reducing maintenance complexity. However, in this technology, the transfer of carbon molecular sieves using a screw conveyor is problematic because the carbon molecular sieves are relatively fragile and prone to generating dust under pressure changes. Furthermore, the carbon molecular sieves are easily subjected to continuous compression between the screw conveyor blades and the inner wall of the conveying cylinder. Under compression, friction, and impact, they are prone to breakage and dust generation, causing fine dust to fill dead corners of the system with the airflow, clogging pipes and valves.

[0005] Therefore, the present invention provides an integrated pressure swing adsorption nitrogen generator. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The integrated pressure swing adsorption nitrogen generator of the present invention includes an air compressor, a filter, an adsorption tank, and a nitrogen storage tank; the air outlet of the air compressor is connected to the air inlet of the filter through a pipe, the air outlet of the filter is connected to the air inlet of the adsorption tank through a pipe, and the air outlet of the adsorption tank is connected to the air inlet of the nitrogen storage tank through a pipe, forming a path for airflow from the air compressor to the nitrogen storage tank; Also includes: A pair of lifting channels are symmetrically arranged inside the adsorption tank; An intermittent transfer module is located at the bottom of the adsorption tank; the lifting channel is arranged between the intermittent transfer module and the inner wall of the adsorption tank; the intermittent transfer module is used to separate the internal space of the adsorption tank into a filling chamber and a diversion chamber, and to control the transfer of carbon molecular sieve from the bottom of the filling chamber to the top of the filling chamber; The top of the lifting channel has a discharge port and the bottom has a feed port. When the airflow enters the adsorption tank from the bottom, the airflow is divided into two directions by the diversion chamber, flowing through the lifting channel and the filling chamber. In conjunction with the intermittent material transfer module, the carbon molecular sieve is controlled to enter the lifting channel through the feed port and then supplemented to the top of the filling chamber through the discharge port at the top of the lifting channel.

[0008] Preferably, a baffle and a guide plate are respectively provided at the top of the lifting channel and on the upper and lower sides of the feed inlet; the baffle can block the carbon molecular sieve that is lifted to the baffle position by the airflow, and cooperate with the guide plate to control the carbon molecular sieve to be replenished to the top of the filling cavity.

[0009] Preferably, the intermittent transfer module includes: An integrated plate is fixed to the bottom of the adsorption tank, and the space between the integrated plate and the adsorption tank is defined as a flow divider. A support plate is fixed to the integrated plate and spaced apart from the integrated plate. The space between the support plate and the adsorption tank is defined as a filling cavity for filling carbon molecular sieves. The on / off switch is slidably connected to the integrated plate and is used to block the support plate to control the flow of carbon molecular sieve; The cam is rotatably connected between the integrated plate and the support plate, and slides in cooperation with the on / off switch; The fan blades are rotatably connected to the center of the integrated plate via a drive shaft; the top of the drive shaft is fixed to a cam via a spline.

[0010] Preferably, the integrated plate is fixedly connected with symmetrically arranged baffles, and the opening and closing switch is slidably connected inside the baffles; the integrated plate is also fixedly connected with symmetrically arranged support plates, and the support plates and baffles are arranged alternately; the bottom surface of the bearing plate abuts against the top surface of the baffles and the support plates. The integrated board has multiple vent holes, and the vent holes connect the diversion cavity and the filling cavity, and the diversion cavity and the lifting channel.

[0011] Preferably, the support plate has a discharge port and a fitting groove corresponding to the on / off switch. The fitting groove is connected to the discharge port. When the support plate is installed on the integrated plate, the lifting channel is inserted into the fitting groove, and the discharge port is adjacent to the feed port at the bottom of the lifting channel. The two sides of the on / off switch block the feed port and the discharge port respectively. The support plate is also provided with equal flow air holes. When the airflow passes through the air holes, it enters the filling cavity evenly through the equal flow air holes.

[0012] Preferably, the on / off switch includes a slider, a sealing plate, a connecting rod, and a first spring; the connecting rod is connected to one end of the slider, and the other end of the slider is set as an inclined surface to guide the carbon molecular sieve flowing through the discharge port to the lifting channel; the sealing plate is slidably connected to the top of the slider to block the discharge port; the connecting rod is slidably engaged with the side wall of the baffle; and the first spring is sleeved on the connecting rod to provide the slider with a restoring force.

[0013] Preferably, the on / off switch further includes an abutment portion fixed to the bottom of the sealing plate, a partition plate parallel to the sealing plate is fixed inside the slider, the abutment portion penetrates the partition plate, and a second spring is sleeved on the abutment portion, the second spring being used to provide the restoring force of the sealing plate.

[0014] Preferably, the integrated plate has a pressing part fixedly connected to the abutment part, and the pressing part slides with the abutment part. When the slider slides radially to block the discharge port, the abutment part and the pressing part slide with each other and are lifted, and the sealing plate moves upward to press against the discharge port to block the discharge port.

[0015] Preferably, the intermittent material transfer module further includes a baffle box, inside which a gear and a pair of tamping rods are provided. The gear is rotatably connected to the middle of the baffle box, and both of the tamping rods are meshed with the gear. The two tamping rods are arranged symmetrically about the center of the gear, and the outer ends of the two tamping rods pass through the two end side walls of the baffle box respectively; the two tamping rods are respectively opposite to the symmetrical discharge ports; the top of the drive shaft passes through the bearing plate and is connected to the gear via a spline.

[0016] Preferably, the adsorption tank includes a tank cover, a tank body, an outlet flange, and an inlet flange. The tank cover is fixed to the tank body, the outlet flange is connected to the top side of the tank body, the inlet flange is connected to the bottom of the tank body, and the fan blade is aligned with the axis of the inlet flange.

[0017] The beneficial effects of this invention are as follows: 1. The integrated pressure swing adsorption nitrogen generator of this invention achieves axial circulation and dynamic position update of carbon molecular sieves through the synergistic action of the lifting channel and intermittent material transfer module set in the adsorption tank. When compressed air enters the adsorption tank, part of the airflow drives the fan blades and cam mechanism to periodically open and close the feed port, so that the carbon molecular sieves at the bottom intermittently enter the lifting channel. Carried by the airflow, the carbon molecular sieves are lifted to the top of the tank and evenly spread on the bed surface again. This allows the carbon molecular sieves to continuously undergo axial migration of bottom adsorption and top regeneration during operation, effectively avoiding the problem of overload failure of the bottom carbon molecular sieves caused by uneven airflow distribution in traditional fixed beds. This significantly extends the service life of the overall carbon molecular sieves, reduces damage to the carbon molecular sieves, improves the stability and purity of nitrogen production, and reduces maintenance costs and downtime caused by frequent replacement of carbon molecular sieves.

[0018] 2. The integrated pressure swing adsorption (PSA) nitrogen generator of the present invention simulates and realizes a continuous pressure swing adsorption working cycle similar to a dual-tower system through an integrated airflow diversion and intermittent material transfer mechanism inside the adsorption tank. During the adsorption and nitrogen production stage, while the main airflow separates oxygen and nitrogen, a portion of the diverted airflow drives the cyclic renewal of the carbon molecular sieve. This makes the adsorption and regeneration processes highly integrated in space and closely linked in time, eliminating the complex valve switching, pipeline connection, and inter-tower balancing steps in traditional dual-tower or multi-tower systems. This not only simplifies the system structure and reduces equipment manufacturing costs and floor space, but also improves nitrogen recovery rate and system energy efficiency by reducing pressure fluctuations and airflow switching losses. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a flowchart of the pressure swing adsorption nitrogen generation process of the present invention; Figure 2 This is a perspective view of the adsorption tank in this invention; Figure 3 This is a side view of the adsorption tank in this invention; Figure 4 yes Figure 3 Sectional view at point AA; Figure 5 yes Figure 4 Enlarged view of point I in the middle; Figure 6 yes Figure 4 A magnified schematic diagram of a local structure; Figure 7 This is an exploded view of the lifting channel and intermittent material transfer module in this invention; Figure 8 This is a schematic diagram of the baffle box and tamping rod in this invention; Figure 9This is a diagram showing the fit between the support plate and the integrated plate in this invention; Figure 10 This is a side view of the intermittent material transfer module in this invention; Figure 11 yes Figure 10 Sectional view at point BB; In the diagram: 1. Adsorption tank; 11. Tank cover; 12. Tank body; 121. Outlet flange; 122. Inlet flange; 13. Diverter chamber; 2. Lifting channel; 21. Outlet; 22. Baffle; 23. Guide plate; 24. Inlet; 3. Intermittent material transfer module; 31. Material baffle box; 311. Tamping rod; 312. Gear; 32. Bearing plate; 321. Flow equalization hole; 322. Fitting groove; 323. Lower... 33. Feed inlet; 34. Cam; 35. Integrated plate; 36. Vent hole; 37. Material baffle; 38. Support plate; 39. Extrusion section; 30. On / off switch; 31. Slider; 32. Sealing plate; 33. Connecting rod; 34. First spring; 35. Abutment part; 36. Second spring; 37. Fan blade; 38. Drive shaft; 4. Filter; 5. Air compressor; 6. Nitrogen storage tank; Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 11 As shown in the embodiment of the present invention, an integrated pressure swing adsorption nitrogen generator includes an air compressor 5, a filter 4, an adsorption tank 1, and a nitrogen storage tank 6. The outlet of the air compressor 5 is connected to the inlet of the filter 4 through a pipe, the outlet of the filter 4 is connected to the inlet of the adsorption tank 1 through a pipe, and the outlet of the adsorption tank 1 is connected to the inlet of the nitrogen storage tank 6 through a pipe, forming a path for airflow from the air compressor 5 to the nitrogen storage tank 6. It also includes: a pair of lifting channels 2 and an intermittent transfer module 3. The pair of lifting channels 2 are symmetrically arranged inside the adsorption tank 1. The intermittent transfer module 3 is located at the bottom of the adsorption tank 1. The lifting channels 2 are arranged between the intermittent transfer module 3 and the inner wall of the adsorption tank 1. The intermittent transfer module 3 is used to separate the internal space of the adsorption tank 1 into a filling cavity and a diversion cavity 13, and to control the transfer of carbon molecular sieve from the bottom of the filling cavity to the top of the filling cavity. The top of the lifting channel 2 is provided with a discharge port 21, and the bottom is provided with a feed port 24. When the airflow enters the adsorption tank 1 from the bottom, the airflow is divided into two directions by the diversion cavity 13, flowing through the lifting channel 2 and the filling cavity. In conjunction with the intermittent transfer module 3, the carbon molecular sieve is controlled to enter the lifting channel 2 through the feed port 24, and then supplemented to the top of the filling cavity through the discharge port 21 at the top of the lifting channel 2.

[0023] In the above technology, based on the transfer of carbon molecular sieve by the auger, the carbon molecular sieve is relatively fragile and easily generates dust under pressure changes. The carbon molecular sieve is easily subjected to continuous compression between the auger blades and the inner wall of the conveying cylinder. Under compression, friction and impact, it is easy to break and generate dust, causing fine dust to fill the dead corners of the system with the airflow, clogging pipes and valves.

[0024] Based on this, in one embodiment of the present invention, to address the potential inconsistency in the replacement cycle of the carbon molecular sieve within the adsorption tank 1 and the pulverization / crushing of the carbon molecular sieve caused by the auger, the intermittent material transfer module 3 controls the intermittent material transfer of the carbon molecular sieve at the bottom of the adsorption tank 1. This allows the carbon molecular sieve at the bottom of the adsorption tank 1 to be intermittently moved to the lifting channel 2 in small amounts. Furthermore, when the airflow enters the adsorption tank 1, the intermittent material transfer module 3 divides the airflow, causing it to be separated by the flow divider 13 into two directions: one flowing through the lifting channel 2 and the other through the filling cavity. It can be understood that when a portion of the airflow flows... When passing through the lifting channel 2, a small amount of carbon molecular sieve entering the channel can be lifted, allowing it to undergo spatial transfer within the channel 2, specifically from the bottom to the top of the adsorption tank 1. Meanwhile, another portion of the airflow flows through the filling chamber, where the main carbon molecular sieve adsorbs the oxygen contained in this portion of the airflow. It is worth noting that a portion of the airflow, while flowing through the lifting channel 2, also undergoes an adsorption reaction with the small amount of carbon molecular sieve that has simultaneously undergone spatial transfer. Furthermore, to improve the adsorption of oxygen and the purification of nitrogen in the airflow, a circulating airflow can be considered. The nitrogen gas is purified by fully adsorbing the gas flow through the adsorption tank 1. Alternatively, referring to a high-efficiency pressure swing adsorption nitrogen generator disclosed in CN112520711A, a transfer gas tank can be added. The gas flow can circulate between the adsorption tank and the transfer gas tank after passing through the filter. In this embodiment, the purity of nitrogen in the gas flow through the lift channel 2 and the gas flow directly through the filling chamber may be inconsistent. It is understood that only a small amount of carbon molecular sieve gas in a portion of the gas flow through the lift channel 2 can undergo an adsorption reaction. Another part of the airflow that flows directly through the filling chamber can undergo an adsorption reaction with the main carbon molecular sieve. Therefore, the oxygen in the other part of the airflow that flows directly through the filling chamber should be adsorbed more fully. Therefore, an intermediate gas tank is added to the system so that the airflow that flows through the lifting channel 2 and the airflow that flows directly through the filling chamber can simultaneously flow into the intermediate gas tank after the adsorption reaction, and then be recirculated into the adsorption tank 1. The airflow is then split in the splitting chamber 13. After multiple cycles, the adsorption effect of oxygen in the airflow and the purity of nitrogen can be gradually improved, so that the purity of the nitrogen finally output to the nitrogen storage tank 6 for storage reaches the expected level. In summary, in this embodiment, airflow is diverted into the diversion chamber 13, allowing a portion of the airflow to flow through the lifting channel 2. This lifts a small amount of carbon molecular sieve entering the lifting channel 2, enabling spatial transfer of the carbon molecular sieve within the adsorption tank 1. This forces a consistent replacement cycle for the carbon molecular sieve within the adsorption tank 1, allowing for complete replacement of the carbon molecular sieve during maintenance rather than partial replacement, thus reducing maintenance pressure. Furthermore, in this embodiment, the integrated airflow diversion and intermittent material transfer mechanism within the adsorption tank 1 simulates and implements a system similar to a dual-tower system. The continuous pressure swing adsorption (PSA) working cycle, during the nitrogen production stage, while the main gas flow separates oxygen and nitrogen, a portion of the diverted gas flow drives the cyclic renewal of the carbon molecular sieve. This makes the adsorption and regeneration processes highly integrated in space and tightly linked in time, eliminating the complex valve switching, pipeline connection, and inter-tower balancing steps in traditional dual-tower or multi-tower systems. This not only simplifies the system structure and reduces equipment manufacturing costs and floor space, but also improves nitrogen recovery rate and system energy efficiency by reducing pressure fluctuations and gas flow switching losses. It is suitable for application scenarios with high requirements for equipment compactness, reliability, and economic operation.

[0025] like Figures 4 to 7 As shown, a baffle 22 and a guide plate 23 are respectively provided on the top of the lifting channel 2 and on the upper and lower sides of the feed inlet 24. The baffle 22 can block the carbon molecular sieve that is lifted to the position of the baffle 22 by the airflow, and cooperate with the guide plate 23 to control the carbon molecular sieve to be replenished to the top of the filling cavity.

[0026] In this embodiment, the carbon molecular sieve at the bottom of the adsorption tank 1 is controlled by the intermittent transfer module 3 to enter the lifting channel 2 from the discharge port 323 and the feed port 24. In the lifting channel 2, there is always a part of the airflow generated by the diversion. This part of the airflow is defined as the lifting airflow. Under the entrainment of the lifting airflow, a small amount of carbon molecular sieve entering the lifting channel 2 can be transferred from the bottom of the adsorption tank 1 to the top of the adsorption tank 1. Under the action of the baffle 22 and the guide plate 23, the small amount of carbon molecular sieve is replenished to the top of the filling cavity, thereby completing the spatial transfer of the carbon molecular sieve in the adsorption tank 1. This allows the carbon molecular sieve in the adsorption tank 1 to dynamically adjust its spatial position, so that the carbon molecular sieve that the airflow that flows directly through the filling cavity contacts first can be dynamically adjusted. This forces the carbon molecular sieve to have a consistent life cycle. That is, during maintenance, it can be ensured that the replacement cycle of the carbon molecular sieve in the filling cavity is consistent. When replacing the carbon molecular sieve, the whole replacement can be considered instead of partial replacement, reducing the complexity and pressure of maintenance. Specifically, in Figure 4 The arrows shown indicate the direction of airflow that lifts the airflow. Figure 6 The arrows shown indicate the direction of airflow for lifting the air.

[0027] like Figure 4 , Figures 6 to 7 , Figures 9 to 11 As shown, the intermittent transfer module 3 includes: The integrated plate 34 is fixed to the bottom of the adsorption tank 1, and the space between the integrated plate 34 and the adsorption tank 1 is defined as the flow divider 13. The support plate 32 is fixedly connected to the integrated plate 34 and spaced apart from the integrated plate 34. The space between the support plate 32 and the adsorption tank 1 is defined as a filling cavity for filling carbon molecular sieve. The on / off switch 35 is slidably connected to the integrated plate 34 and is used to block the support plate 32 to control the flow of carbon molecular sieve. Cam 33 is rotatably connected between integrated plate 34 and bearing plate 32, and slides with on / off switch 35; The fan blade 36 is rotatably connected to the center of the integrated plate 34 via the drive shaft 361; the top of the drive shaft 361 is fixedly connected to the cam 33 via a spline.

[0028] In this embodiment, the intermittent transfer module 3 controls the carbon molecular sieves in the filling chamber to enter the lifting channel 2 in small quantities at fixed intervals, thereby coordinating with the lifting airflow to achieve spatial transfer of the small amount of carbon molecular sieves and forcing all carbon molecular sieves to have the same life cycle. Specifically, in the application stage, the adsorption tank 1 is divided into a diversion chamber 13 and a filling chamber based on the integrated plate 34 and the support plate 32. The chamber between the adsorption tank 1 and the integrated plate 34 is defined as the diversion chamber 13, while the chamber between the support plate 32 and the adsorption tank 1 is defined as the filling chamber. It can be understood that the airflow enters from the bottom of the adsorption tank 1 and directly enters the diversion chamber 13, while the carbon molecular sieves fill the filling chamber. The space between the integrated plate 34 and the support plate 32 is used to accommodate the on / off switch 35, the cam 33, and the fan blade 36. Specifically, when the airflow enters from the bottom of the adsorption tank 1, it is divided into two airflows in the diversion chamber 13. The lifting airflow enters the lifting channel 2 through the integrated plate 34, while the other part... The airflow directly penetrates the support plate 32 and enters the filling chamber, where it undergoes an adsorption reaction based on the carbon molecular sieves filled within. When the airflow enters the distribution chamber 13, it comes into contact with the fan blades 36, causing them to rotate. The fan blades 36, driven by the drive shaft 361, drive the cam 33 to rotate synchronously. After rotation, the cam 33 drives the on / off switch 35 to open and close intermittently, thereby controlling the intermittent feeding of the carbon molecular sieves from the support plate 32 to the lifting channel 2. This, combined with the lifting airflow, elevates the carbon molecular sieves fed into the lifting channel 2, allowing a small amount of carbon molecular sieves to be transferred spatially. By using the lifting airflow to elevate the small amount of carbon molecular sieves released into the lifting channel 2, the compression of the carbon molecular sieves is avoided, reducing the pulverization / crushing of the carbon molecular sieves. This effectively prevents the carbon molecular sieves from pulverizing / crushing during spatial transfer, thus preventing pulverized particles from clogging the adsorption tank 1 and affecting the airflow.

[0029] like Figure 4 , Figure 7 , Figures 9 to 11 As shown, symmetrically arranged baffles 342 are fixedly connected to the integrated plate 34, and the on / off switch 35 is slidably connected inside the baffles 342; symmetrically arranged support plates 343 are also fixedly connected to the integrated plate 34, and the support plates 343 and the baffles 342 are arranged alternately; the bottom surface of the bearing plate 32 abuts against the top surface of the baffles 342 and the support plate 343. The integrated plate 34 has multiple vent holes 341, and the vent holes 341 connect the diversion cavity 13 with the filling cavity and the diversion cavity 13 with the lifting channel 2.

[0030] In this embodiment, the support plate 32 is fixed to the integrated plate 34 by its bottom surface abutting against the support plate 343 and the baffle 342. It is understood that screws can be used to fix the support plate 32 to the integrated plate 34, and the support plate 343 and the baffle 342 create a fixed gap between the integrated plate 34 and the support plate 32 to accommodate the on / off switch 35 and the cam 33. The on / off switch 35 slides within the baffle 342, while the cam 33 rotates within the gap formed between the integrated plate 34 and the support plate 32. In order to allow airflow to enter the gap from the distribution cavity 13, a vent hole 341 is opened on the integrated plate 34, so that when the airflow enters the adsorption tank 1 from the bottom, it can enter the gap between the integrated plate 34 and the support plate 32 through the distribution cavity 13. A part of the airflow (lifting airflow) can directly enter the lifting channel 2 through the vent hole 341 corresponding to the lifting channel 2, thereby lifting the carbon molecular sieve entering the lifting channel 2. The other part of the airflow directly enters the filling cavity through the vent hole 341 and the support plate 32.

[0031] like Figures 4 to 6 , Figure 7 , Figures 9 to 11 As shown, the support plate 32 has a discharge port 323 and a fitting groove 322 corresponding to the on / off switch 35. The fitting groove 322 is connected to the discharge port 323. When the support plate 32 is installed on the integrated plate 34, the lifting channel 2 is inserted into the fitting groove 322, and the discharge port 323 is adjacent to the feed inlet 24 at the bottom of the lifting channel 2. The on / off switch 35 blocks the feed inlet 24 and the discharge port 323 on both sides respectively. The support plate 32 is also provided with equal flow air holes 321. When the airflow passes through the vent 341, it enters the filling cavity evenly through the equal flow air holes 321.

[0032] As mentioned above, another part of the airflow needs to enter the filling cavity directly through the vent 341 and the support plate 32. Therefore, the flow equalization vent 321 needs to be opened on the support plate 32. The flow equalization vent 321 can make the airflow in the filling cavity evenly distributed, so as to have a uniform adsorption reaction with the carbon molecular sieves piled in the filling cavity. The small amount of carbon molecular sieves that the lifting airflow comes into contact with can be exposed by the discharge port 323 on the support plate 32 under the control of the on / off switch 35, so as to satisfy the space for the small amount of carbon molecular sieves to pass through the support plate 32. The small amount of carbon molecular sieves flows directly into the lifting channel 2 through the exposed discharge port 323, the on / off switch 35 and the feed port 24, so as to merge with the lifting airflow. Under the drive of the lifting airflow, it is transferred from the bottom of the lifting channel 2 to the top of the lifting channel 2, and under the limiting action of the baffle 22 and the guide plate 23, it is transferred to the top of the filling cavity, realizing the spatial transfer of the small amount of carbon molecular sieves. The fitting groove 322 on the support plate 32 can be installed in conjunction with the lifting channel 2. When the support plate 32 is installed in place, the lifting channel 2 is inserted into the fitting groove 322, while the discharge port 323 is blocked by the on / off switch 35. When the on / off switch 35 is open, the discharge port 323 is exposed, allowing a small amount of carbon molecular sieve to pass through. When the on / off switch 35 is closed, the discharge port 323 is closed, and a small amount of carbon molecular sieve cannot pass through.

[0033] like Figures 4 to 5 , Figure 7 , Figure 9 As shown, the on / off switch 35 includes a slider 351, a sealing plate 352, a connecting rod 353, and a first spring 354. The connecting rod 353 is connected to one end of the slider 351, and the other end of the slider 351 is set as an inclined surface to guide the carbon molecular sieve flowing through the discharge port 323 into the lifting channel 2. The sealing plate 352 is slidably connected to the top of the slider 351 to block the discharge port 323. The connecting rod 353 is slidably engaged with the side wall of the baffle 342. The first spring 354 is sleeved on the connecting rod 353 to provide the restoring force of the slider 351.

[0034] The on / off switch 35 is used to open and close the discharge port 323 on the support plate 32. Based on the on / off switch 35, the flow path of the carbon molecular sieve at the bottom of the filling chamber can be controlled. Specifically, as described above, when the on / off switch 35 is open, the discharge port 323 is exposed, allowing a small amount of carbon molecular sieve to pass through. When the on / off switch 35 is closed, the discharge port 323 is closed, preventing a small amount of carbon molecular sieve from passing through. The main body of the on / off switch 35 is composed of a slider 351 and a connecting rod 353. Figure 5As shown, when the tip of the cam 33 presses against the connecting rod 353, the slider 351 will move radially toward the lifting channel 2 under the action of the connecting rod 353. At this time, the sealing plate 352 on the slider 351 can move to correspond to the discharge port 323, thereby blocking the discharge port 323, i.e., closing the discharge port 323. The other end face of the slider 351 can block the inlet 24, thereby achieving synchronous closure of the discharge port 323 and the inlet 24. When the tip of the cam 33 leaves the connecting rod 353, the connecting rod 353 will reset under the action of the first spring 354, i.e., the slider 351 will move radially away from the lifting channel 2. At this time, the sealing plate 352 will leave the discharge port 323, and both the discharge port 323 and the inlet 24 will be open. The carbon molecular sieve can flow directly into the lifting channel 2 through the discharge port 323, the inclined surface of the other end of the slider 351 and the inlet 24, and achieve spatial transfer in conjunction with the lifting airflow. When the slider 351 moves radially away from the lifting channel 2, a small amount of carbon molecular sieve passing through the discharge port 323 can quickly enter the lifting channel 2 through the feed port 24 under the guidance of the inclined surface at the other end of the slider 351. In addition, in this embodiment, the first spring 354 is used to pull the slider 351 back into the baffle 342 when the connecting rod 353 is not under force. Specifically, the slider 351 retracts, the connecting rod 353 slides on the side wall of the baffle 342, and the sealing plate 352 leaves the discharge port 323. Based on the above, through the sliding cooperation between the cam 33 and the connecting rod 353, when the tip of the cam 33 contacts the connecting rod 353, it can squeeze the connecting rod 353 to drive the slider 351 to move radially towards the lifting channel 2, thereby closing the discharge port 323 and the feed port 24. Conversely, the slider 351 opens the discharge port 323 and the feed port 24, realizing the intermittent spatial transfer of the small amount of carbon molecular sieve entering the lifting channel 2 by the lifting airflow.

[0035] like Figure 5 As shown, the on / off switch 35 also includes an abutment portion 355 fixed to the bottom of the sealing plate 352. A partition plate parallel to the sealing plate 352 is fixed inside the slider 351. The abutment portion 355 passes through the partition plate. A second spring 356 is sleeved on the abutment portion 355. The second spring 356 is used to provide the restoring force of the sealing plate 352.

[0036] like Figure 5 As shown, an extrusion part 344 is fixedly connected to the integrated plate 34 corresponding to the abutment part 355. The extrusion part 344 and the abutment part 355 are in sliding engagement. When the slider 351 slides radially to block the discharge port 323, the abutment part 355 and the extrusion part 344 are in sliding engagement and lifted. The sealing plate 352 moves upward to press against the discharge port 323 to block the discharge port 323.

[0037] The slider 351 and connecting rod 353 are radially displaced under the squeezing action of cam 33, realizing the switching of the opening and closing state of the discharge port 323 and the feed port 24. However, under the premise of smooth sliding, there must be a gap between the slider 351 and the support plate 32 and the integrated plate 34. This gap may cause the sealing effect of the discharge port 323 to fail. In this embodiment, when the slider 351 is displaced towards the lifting channel 2 when the connecting rod 353 is squeezed by the tip of cam 33, the abutting part 355 at the bottom of the sealing plate 352 can contact the squeezing part 344 at the bottom of the integrated plate 34, so that the abutting part 355 can be lifted, thereby achieving effective sealing of the discharge port 323. When the slider 351 is displaced in the opposite direction to open the discharge port 323 and the feed port 24, the sealing plate 352 can be reset to be flush with the top surface of the slider 351 under the action of the second spring 356, thereby ensuring the smooth movement of the slider 351. Based on the displacement of slider 351 and the sliding cooperation between the contact part 355 and the extrusion part 344, when slider 351 blocks the discharge port 323, the sealing plate 352 moves upward to effectively seal the discharge port 323. Conversely, when slider 351 opens the discharge port 323, the sealing plate 352 can be reset to be flush with the top surface of slider 351 under the action of the second spring 356, ensuring the smooth displacement of slider 351. like Figure 5 As shown, when slider 351 moves from right to left (corresponding to slider 351 moving towards the lifting channel 2), the abutment portion 355 (sloping surface) inside slider 351 can contact the extrusion portion 344 (sloping surface) at the bottom of integrated plate 34 and slide relative to it as slider 351 moves. Since the extrusion portion 344 on integrated plate 34 is in a fixed position, the abutment portion 355 inside slider 351 will be lifted synchronously during the radial displacement, thereby pressing against the discharge port 323 on the bearing plate 32, so that the bearing... The discharge port 323 on the carrier plate 32 is sealed. Conversely, when the slider 351 is reset from the left to the right, the abutment part 355 slides relative to the extrusion part 344. The abutment part 355 moves down, causing the sealing plate 352 to move down to remove the seal on the discharge port 323, so that the discharge port 323 and the outlet 21 are opened. At this time, a small amount of carbon molecular sieve can enter the lifting channel 2 from the discharge port 323, the inclined surface on the slider 351 and the feed port 24, thereby merging with the lifting airflow and completing the spatial transfer under the action of the lifting airflow.

[0038] like Figures 4 to 8 As shown, the intermittent material transfer module 3 also includes a baffle box 31. The baffle box 31 is equipped with a gear 312 and a pair of tamping rods 311. The gear 312 is rotatably connected to the middle of the baffle box 31, and the pair of tamping rods 311 are meshed with the gear 312. The two tamping rods 311 are arranged symmetrically about the center of the gear 312, and the outer ends of the two tamping rods 311 respectively penetrate the two end side walls of the baffle box 31; the two tamping rods 311 are respectively corresponding to the symmetrical discharge ports 323; the top of the drive shaft 361 penetrates the bearing plate 32 and is connected to the gear 312 via a spline.

[0039] Because the carbon molecular sieves are stacked in the filling cavity, after long-term use, the stacking effect may cause the bottom of the carbon molecular sieves to clump and harden. Therefore, when the discharge port 323 is opened, the hardened carbon molecular sieves cannot smoothly pass through the discharge port 323 into the lifting channel 2. In this embodiment, considering that the hardened carbon molecular sieves are difficult to pass through the discharge port 323 smoothly, a baffle box 31 is provided on the support plate 32. Based on the baffle box 31, the carbon molecular sieves can avoid direct contact with the tamping rod 311 and the gear 312. When the gear 312 drives the tamping rod 311 to move, the tamping rod 311 can intermittently extend out of the baffle box 31 and destroy the carbon molecular sieves that form a bridging effect, so that the bridging effect of the carbon molecular sieves fails. Subsequently, the carbon molecular sieves can effectively enter the lifting channel 2 through the discharge port 323. It should be noted that in this embodiment, the gear 312 is directly connected to the drive shaft 361 via a spline. However, if the speed of the drive shaft 361 is too fast, the intermittent extension and retraction speed of the tamping rod 311 may be too fast. In a unit of time, the high-frequency destruction of the carbon molecular sieve above the discharge port 323 will result in a certain amount of energy waste, and may even cause a small amount of carbon molecular sieve to be pulverized or broken. Therefore, considering this problem, based on this embodiment, a speed reducer can be integrated into the drive shaft 361 to control the rotation speed of the gear 312, thereby reducing the rotation speed of the gear 312 and strictly controlling the extension and retraction frequency of the tamping rod 311. In addition, in order to avoid the carbon molecular sieve breakage that may be caused by the high-frequency extension and retraction of the tamping rod 311, the size of the tamping rod 311 can be reduced so that it only achieves the bridging effect of destroying the carbon molecular sieve, without causing serious damage to the carbon molecular sieve, such as pulverization and breakage. Furthermore, it is worth noting that, such as Figure 8 As shown, the tamping rod 311 is zigzag-shaped, with its outer end configured to extend out of the baffle box 31 for tamping function, and its inner end configured to have teeth that mesh with the gear 312 on its inner side, and a cylindrical cavity is opened inside the inner end. A limiting rod (not shown in the figure) corresponding to the cylindrical cavity is fixedly connected to the inner wall of the baffle box 31. Based on the sliding fit between the limiting rod and the cylindrical cavity, the tamping rod 311 can be slidably limited. In addition, when the gear 312 slips off from the teeth, the tamping rod 311 can be reset based on the third spring (not shown in the figure) sleeved on the limiting rod.

[0040] like Figures 2 to 3As shown, the adsorption tank 1 includes a tank cover 11, a tank body 12, an outlet flange 121, and an inlet flange 122. The tank cover 11 is fixed to the tank body 12. The outlet flange 121 is connected to the top side of the tank body 12. The inlet flange 122 is connected to the bottom of the tank body 12, and the fan blade 36 is aligned with the axis of the inlet flange 122.

[0041] Specifically, in this embodiment, the airflow enters the tank 12 of the adsorption tank 1 through the inlet flange 122. After the airflow lifts a small amount of carbon molecular sieve and is adsorbed by the carbon molecular sieve, it can enter the nitrogen storage tank 6 or the transfer gas tank through the outlet flange 121 to achieve the circulation adsorption of the airflow.

[0042] Working principle: Ambient air is compressed to 0.6-1.0 MPa by air compressor 5, and then passes through filter 4 to remove oil, moisture and particulate impurities. The clean compressed air is then delivered through pipeline to the inlet flange 122 at the bottom of adsorption tank 1. This is the preparatory stage for PSA pressurization adsorption, ensuring the purity of the incoming air and preventing pollutants from poisoning the carbon molecular sieve. Subsequently, the airflow enters the diversion chamber 13 at the bottom of adsorption tank 1 from the inlet flange 122, and through the vent 341 on the integrated plate 34, the airflow is split into two paths: Main airflow (approximately 70%-80%): passes upward through the uniform airflow holes 321 of the support plate 32 and enters the filling chamber (carbon molecular sieve bed) evenly for oxygen and nitrogen separation; Boosting airflow (approximately 20%-30%): enters boosting channel 2 to drive the circulation of carbon molecular sieve; The uniform air holes 321 on the support plate 32 ensure uniform distribution of the main airflow, and the speed of the boosting airflow is naturally regulated by the inlet pressure. In this application, it is assumed that the speed of the boosting airflow is stable at 2-3 m / s (sufficient to boost the carbon molecular sieve). Subsequently, the main airflow comes into contact with the carbon molecular sieve in the filling chamber. The carbon molecular sieve selectively adsorbs oxygen, and the enriched nitrogen is output from the outlet flange 121 on the top of the tank to the nitrogen storage tank 6 or the transfer tank. During this stage, the pressure is maintained at a high level (0.8 MPa). In order to improve the enrichment efficiency of nitrogen in the airflow, the airflow can be circulated in the adsorption tank 1 and the transfer tank based on the transfer tank, thereby improving the purification effect of nitrogen. The airflow in the diversion chamber 13 impacts the fan blade 36, driving the cam 33 to rotate. The cam 33 controls the slider 351 of the on / off switch 35 to slide radially through the periodic compression of the connecting rod 353. When the slider 351 slides, it opens the discharge port 323 and the feed port 2. At 4 o'clock, a small amount of carbon molecular sieve at the bottom of the filling chamber is guided into the lifting channel 2 by the inclined plane. The lifting airflow carries the carbon molecular sieve to the top discharge port 21. Under the action of the baffle 22 and the guide plate 23, it falls back to the top of the filling chamber. Based on the above cycle, the position of the carbon molecular sieve is dynamically changed to avoid overloading of the bottom carbon molecular sieve and extend the overall life. The above stage corresponds to the adsorption period of PSA, and the utilization rate of carbon molecular sieve is optimized through internal circulation. After adsorption saturation (judged by time or oxygen sensor), the system enters the desorption stage. The air inlet valve is closed, the pressure of adsorption tank 1 drops to normal pressure or negative pressure, and the carbon molecular sieve releases the adsorbed oxygen. The desorbed oxygen (waste gas) is discharged from the exhaust valve at the bottom of adsorption tank 1.

[0043] The PLC controller coordinates the adsorption / desorption switching, airflow distribution, and intermittent material transfer frequency. During the adsorption period, the airflow is continuous, and the fan blade 36 drives the cam 33 to open and close every 2-3 seconds to achieve quantitative lifting of the carbon molecular sieve. During the desorption period, the airflow is paused, the material transfer stops, and the focus is on desorption. By integrating the lifting channel 2 and the intermittent material transfer module 3 into the adsorption tank 1, airflow lifting is used to replace the mechanical auger, reducing the compression of the carbon molecular sieve and forcing the replacement cycle of the carbon molecular sieve to be consistent, making the maintenance of the carbon molecular sieve simpler. The carbon molecular sieve can be replaced as a whole rather than partially at the end of its service life.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated pressure swing adsorption nitrogen generator, comprising an air compressor (5), a filter (4), an adsorption tank (1), and a nitrogen storage tank (6); the outlet of the air compressor (5) is connected to the inlet of the filter (4) through a pipe, the outlet of the filter (4) is connected to the inlet of the adsorption tank (1) through a pipe, and the outlet of the adsorption tank (1) is connected to the inlet of the nitrogen storage tank (6) through a pipe, forming a path for airflow from the air compressor (5) to the nitrogen storage tank (6); Its features are, Also includes: A pair of lifting channels (2) are symmetrically arranged inside the adsorption tank (1); Intermittent transfer module (3) is set at the bottom of the adsorption tank (1); the lifting channel (2) is arranged between the intermittent transfer module (3) and the inner wall of the adsorption tank (1); the intermittent transfer module (3) is used to separate the internal space of the adsorption tank (1) into a filling chamber and a diversion chamber (13) and to control the transfer of carbon molecular sieve from the bottom of the filling chamber to the top of the filling chamber; The top of the lifting channel (2) is provided with a discharge port (21) and the bottom is provided with a feed port (24). When the airflow enters the adsorption tank (1) from the bottom, the airflow is divided into two directions through the diversion chamber (13) and flows through the lifting channel (2) and the filling chamber. In conjunction with the intermittent material transfer module (3), the carbon molecular sieve is controlled to enter the lifting channel (2) through the feed port (24) and then supplemented to the top of the filling chamber through the discharge port (21) at the top of the lifting channel (2).

2. The integrated pressure swing adsorption nitrogen generator according to claim 1, characterized in that: The top of the lifting channel (2) and the upper and lower sides of the feed inlet (24) are respectively provided with baffle (22) and guide plate (23); the baffle (22) can block the carbon molecular sieve that is lifted to the position of the baffle (22) by the airflow, and cooperate with the guide plate (23) to control the carbon molecular sieve to be replenished to the top of the filling cavity.

3. The integrated pressure swing adsorption nitrogen generator according to claim 1, characterized in that: The intermittent transfer module (3) includes: An integrated plate (34) is fixed to the bottom of the adsorption tank (1), and the space between the integrated plate (34) and the adsorption tank (1) is defined as a flow divider (13). The support plate (32) is fixed on the integrated plate (34) and spaced apart from the integrated plate (34). The space between the support plate (32) and the adsorption tank (1) is defined as a filling cavity for filling carbon molecular sieves. The on / off switch (35) is slidably connected to the integrated plate (34) and is used to block the support plate (32) to control the flow of carbon molecular sieve; The cam (33) is rotatably connected between the integrated plate (34) and the support plate (32), and slides with the on / off switch (35); The fan blade (36) is rotatably connected to the center of the integrated plate (34) via the drive shaft (361); the top of the drive shaft (361) is fixed to the cam (33) via a spline.

4. The integrated pressure swing adsorption nitrogen generator according to claim 3, characterized in that: A symmetrically arranged baffle (342) is fixedly connected to the integrated plate (34), and the on / off switch (35) is slidably connected inside the baffle (342); a symmetrically arranged support plate (343) is also fixedly connected to the integrated plate (34), and the support plate (343) and the baffle (342) are arranged alternately; the bottom surface of the bearing plate (32) abuts against the top surface of the baffle (342) and the support plate (343); The integrated plate (34) has multiple vent holes (341) and the vent holes (341) connect the diversion cavity (13) and the filling cavity, and the diversion cavity (13) and the lifting channel (2).

5. An integrated pressure swing adsorption nitrogen generator according to claim 3, characterized in that: The support plate (32) is provided with a discharge port (323) and a fitting groove (322) corresponding to the on / off switch (35). The fitting groove (322) is connected to the discharge port (323). When the support plate (32) is installed on the integrated plate (34), the lifting channel (2) is inserted into the fitting groove (322), and the discharge port (323) is adjacent to the feed inlet (24) at the bottom of the lifting channel (2). The on / off switch (35) blocks the feed inlet (24) and the discharge port (323) on both sides respectively. The support plate (32) is also provided with equal flow air holes (321). When the airflow passes through the vent hole (341), it enters the filling cavity evenly through the equal flow air holes (321).

6. An integrated pressure swing adsorption nitrogen generator according to claim 4, characterized in that: The on / off switch (35) includes a slider (351), a sealing plate (352), a connecting rod (353), and a first spring (354). The connecting rod (353) is connected to one end of the slider (351), and the other end of the slider (351) is set as an inclined surface to guide the carbon molecular sieve flowing through the discharge port (323) to the lifting channel (2). The sealing plate (352) is slidably connected to the top of the slider (351) to block the discharge port (323). The connecting rod (353) is slidably engaged with the side wall of the baffle (342). The first spring (354) is sleeved on the connecting rod (353) to provide the restoring force of the slider (351).

7. An integrated pressure swing adsorption nitrogen generator according to claim 6, characterized in that: The on / off switch (35) also includes an abutment part (355) fixed to the bottom of the sealing plate (352). A partition parallel to the sealing plate (352) is fixed inside the slider (351). The abutment part (355) passes through the partition. A second spring (356) is sleeved on the abutment part (355). The second spring (356) is used to provide the restoring force of the sealing plate (352).

8. An integrated pressure swing adsorption nitrogen generator according to claim 7, characterized in that: An extrusion part (344) is fixedly connected to the integrated plate (34) corresponding to the abutment part (355). The extrusion part (344) and the abutment part (355) slide in cooperation. When the slider (351) slides radially to block the discharge port (323), the abutment part (355) and the extrusion part (344) slide in cooperation and are lifted. The sealing plate (352) moves upward to press against the discharge port (323) to block the discharge port (323).

9. An integrated pressure swing adsorption nitrogen generator according to claim 3, characterized in that: The intermittent material transfer module (3) also includes a baffle box (31), inside which a gear (312) and a pair of tamping rods (311) are provided. The gear (312) is rotatably connected to the middle of the baffle box (31), and the pair of tamping rods (311) are meshed with the gear (312). The two tamping rods (311) are arranged symmetrically about the center of the gear (312), and the outer ends of the two tamping rods (311) penetrate the two end side walls of the baffle box (31); the two tamping rods (311) are respectively opposite to the symmetrical discharge port (323); The top of the drive shaft (361) passes through the support plate (32) and is splined to the gear (312).

10. An integrated pressure swing adsorption nitrogen generator according to claim 3, characterized in that: The adsorption tank (1) includes a tank cover (11), a tank body (12), an outlet flange (121), and an inlet flange (122). The tank cover (11) is fixed to the tank body (12). The outlet flange (121) is connected to the top side of the tank body (12). The inlet flange (122) is connected to the bottom of the tank body (12). The fan blade (36) is aligned with the axis of the inlet flange (122).

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