Single-tower VPSA (Vacuum Pressure Swing Adsorption) oxygen production device

Abstract

The utility model discloses a single-tower VPSA oxygen production device, which comprises an adsorption tower, a cooler, a filter silencer, an air blower, a pressure equalizing tank and an oxygen buffer tank, the adsorption tower, the cooler, the filter silencer, the air blower, the pressure equalizing tank and the oxygen buffer tank are connected through pipelines and valves, and a plurality of groups of screening frames are arranged in the adsorption tower. A lead screw is in threaded connection with the interior of the screening frame, the lower end of the lead screw is rotationally connected with the inner wall of the adsorption tower, a cover plate is arranged at the upper end of the adsorption tower, a through hole is formed in the middle of the cover plate and aligned with the upper end of the lead screw, a sealing ring is fixedly installed on the inner side wall of the through hole, and supporting legs are fixedly connected to the lower end of the adsorption tower. The upper surface of the cover plate is fixedly connected with an exhaust pipe. The trouble of workers is reduced, meanwhile, the burden of the workers is reduced, the workers can conveniently take out the screening frame in the adsorption tower to replace screened particles in the screening frame, and the practicability of the adsorption tower is further improved.

Description

Technical Field

[0001] This utility model relates to the field of adsorption tower technology, specifically a single-tower VPSA oxygen generation device. Background Technology

[0002] Medical oxygen generation requires stringent on-site installation conditions and has high system costs, making it unaffordable for many users. With the rapid development of the international and domestic oxygen generation industry, the emergence of medical PSA oxygen generation technology has effectively alleviated this problem. However, the oxygen generation process requires the use of oxygen generation equipment, and existing oxygen generation equipment generally uses a dual-tower VPSA for oxygen production.

[0003] Currently, the area occupied by dual-tower VPSA oxygen production is relatively large, and the investment cost is relatively high. In addition, there are many adsorption towers and moving equipment, which will increase the failure rate of the equipment and is not conducive to stable and long-term oxygen production.

[0004] Existing oxygen production equipment generally requires the use of adsorption towers. However, the existing adsorption towers have a relatively simple structure. When it is necessary to disassemble the internal screening components, a lot of screws need to be removed. To take out the screening components, it is necessary to enter the interior of the adsorption tower, which increases the trouble and burden on the staff and further reduces the practicality of the adsorption tower.

[0005] Practical content

[0006] To address the shortcomings of existing technologies, this invention provides a single-tower VPSA oxygen generation device, which solves the problem that the existing adsorption tower has a relatively simple structure and is inconvenient to replace the internal molecular sieve, reducing the trouble and burden on the staff, and further improving the practicality of the adsorption tower.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A single-tower VPSA oxygen generator includes an adsorption tower, a cooler, a filter silencer, a blower, a pressure equalization tank, and an oxygen buffer tank. The adsorption tower, cooler, filter silencer, blower, pressure equalization tank, and oxygen buffer tank are connected by pipes and valves. Multiple sets of screening frames are installed inside the adsorption tower. Each screening frame is internally threaded with a lead screw, the lower end of which is rotatably connected to the inner wall of the adsorption tower. A cover plate is provided at the upper end of the adsorption tower, with a through hole in the middle. The through hole is aligned with the upper end of the lead screw, and a sealing ring is fixedly installed on the inner wall of the through hole. A support leg is fixedly connected to the lower end of the adsorption tower. An exhaust pipe is fixedly connected to the upper surface of the cover plate, and a sealing ring is fixedly connected to the lower surface of the cover plate, the sealing ring being aligned with the upper end of the adsorption tower.

[0008] Preferably, a snap-fit ​​block is fixedly connected to the side surface of the cover plate, and an installation groove is provided on the upper outer surface of the adsorption tower. The installation groove has an L-shaped structure, and the upper end of the installation groove is aligned with the snap-fit ​​block.

[0009] Preferably, the lower surface of the support leg is fixedly connected with an anti-slip pad, and the side surface of the support leg is fixedly connected with two sets of reinforcing plates, which are connected by a support plate.

[0010] Preferably, a sealing strip is fixedly connected to the side surface of the screening frame, and a sealing door is installed on the upper surface of the screening frame.

[0011] Preferably, an air inlet pipe is fixedly connected to the lower side surface of the adsorption tower, and a filter box is fixedly connected to one end of the air inlet pipe. A filter screen plate is slidably connected inside the filter box, and a cooler is fixedly connected to one side surface of the filter box.

[0012] Preferably, the upper surface of the lead screw is provided with a groove, and the groove is a hexagonal groove.

[0013] This invention provides a single-tower VPSA oxygen generation device. Compared with existing technologies, it has the following advantages:

[0014] 1. The multiple sets of screening frames inside the adsorption tower, the threaded rods inside the screening frames, the grooves at the top of the rods, and the cover plate installed at the top of the adsorption tower via snap-fit ​​blocks and mounting slots reduce the trouble and burden on the staff. This makes it easier for staff to remove the screening frames inside the adsorption tower and replace the sieved particles inside the screening frames, further improving the practicality of the adsorption tower.

[0015] 2. The support legs, which are fixedly connected to the lower end of the support legs on the lower surface of the adsorption tower and reinforced by anti-slip pads and reinforcing plates fixedly connected to the side surfaces of the support legs, work together to enhance the reinforcement effect of the support legs, preventing them from easily deforming and further improving the stability of the support legs in supporting the adsorption tower.

[0016] 3. This utility model changes the double-tower VPSA to a single-tower VPSA, thereby reducing the floor space and investment costs. It also reduces the number of devices used and lowers the equipment failure rate, thus facilitating stable and long-term oxygen production. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure from below, which is useful for this project.

[0019] Figure 3 This is a schematic diagram of the internal structure of the adsorption tower used in this application.

[0020] Figure 4 This is a schematic diagram of the oxygen production process structure for this practical application.

[0021] In the diagram: 1. Adsorption tower; 101. Inlet pipe; 102. Mounting slot; 2. Cooler; 3. Filter box; 301. Filter screen plate; 4. Cover plate; 401. Through hole; 402. Exhaust pipe; 403. Clip block; 404. Sealing ring; 5. Support leg; 501. Anti-slip pad; 502. Reinforcing plate; 503. Support plate; 6. Lead screw; 602. Groove; 7. Screening frame; 701. Sealing strip; 702. Sealing door; 8. Blower; 9. Filter silencer; 10. Pressure equalizing tank; 11. Oxygen buffer tank. Detailed Implementation

[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution: a single-tower VPSA oxygen generator, including an adsorption tower 1, a cooler 2, a filter silencer 9, a blower 8, a pressure equalization tank 10, and an oxygen buffer tank 11. The adsorption tower 1, cooler 2, filter silencer 9, blower, pressure equalization tank, and oxygen buffer tank are connected by pipes and valves. Multiple sets of screening frames 7 are set inside the adsorption tower 1. The internal threads of the screening frames 7 are connected to lead screws 6, and the lower end of the lead screws 6 is rotatably connected to the inner wall of the adsorption tower 1. The upper end of the adsorption tower 1 is provided with a cover plate 4, and a through hole 401 is opened in the middle of the cover plate 4. The through hole 401 is aligned with the upper end of the lead screw 6, and a sealing ring is fixedly installed on the inner side wall of the through hole 401. The lower end of the adsorption tower 1 is fixedly connected to a support leg 5. An exhaust pipe 402 is fixedly connected to the upper surface of the cover plate 4, and a sealing ring 404 is fixedly connected to the lower surface of the cover plate 4. The sealing ring 404 is aligned with the upper end of the adsorption tower 1.

[0024] As a technical optimization solution of this utility model, a snap-fit ​​block 403 is fixedly connected to the side surface of the cover plate 4, and an installation groove 102 is opened on the upper outer surface of the adsorption tower 1. The installation groove 102 has an L-shaped structure, and the upper end of the installation groove 102 is aligned with the snap-fit ​​block 403. The cover plate 4 can be quickly installed through the snap-fit ​​block 403 and the installation groove 102, which reduces the trouble for workers and improves the efficiency of installation and disassembly of the cover plate 4.

[0025] As a technical optimization solution of this utility model, the lower surface of the support leg 5 is fixedly connected with an anti-slip pad 501, and the side surface of the support leg 5 is fixedly connected with two sets of reinforcing plates 502. The reinforcing plates 502 are connected by a support plate 503, which can enhance the support performance of the support leg 5 and further improve the stability of the adsorption tower 1.

[0026] As a technical optimization solution of this utility model, a sealing strip 701 is fixedly connected to the side surface of the screening frame 7, and a sealing door 702 is installed on the upper surface of the screening frame 7. The sealing strip 701 can enhance the adsorption and filtration of oxygen by the screening frame 7 and prevent oxygen leakage. The sealing door 702 on the upper surface of the screening frame 7 can facilitate the replacement of the screening particles inside the screening frame 7 by the staff.

[0027] As a technical optimization scheme of this utility model, an air inlet pipe 101 is fixedly connected to the lower side surface of the adsorption tower 1, and a filter box 3 is fixedly connected to one end of the air inlet pipe 101. A filter screen plate 301 is slidably connected inside the filter box 3, and a cooler 2 is fixedly connected to one side surface of the filter box 3. The cooled oxygen can be initially filtered through the filter screen plate 301 inside the filter box 3, and the purification effect of oxygen can be further improved.

[0028] As a technical optimization solution of this utility model, a groove 602 is provided on the upper surface of the lead screw 6, and the groove 602 is a hexagonal groove, which allows the operator to easily drive the lead screw 6 to rotate using a hexagonal wrench.

[0029] The workflow of this utility is as follows:

[0030] Step 1: Adsorption Process

[0031] After being pressurized by a blower, the raw gas enters adsorption tower 1 from the bottom of the adsorption tower. After selective adsorption by the adsorbent, oxygen with a purity of 70-90% is directly obtained and discharged from the top of the tower into the product oxygen buffer tank V102.

[0032] Step 2: Pressure Equalization and Reduction Process

[0033] After the adsorption process is completed, the inlet and oxygen production valves (all valves described below are programmable valves) are closed, and the pressure equalization valve of the adsorption tower is opened. Since the pressure in adsorption tower 1 is higher than that in pressure equalization tank 10 at this time, under the action of pressure difference, the gas in adsorption tower 1 flows into pressure equalization tank 10 along the adsorption direction. The oxygen content of this gas is also relatively high (but lower than the oxygen purity of the product). This process is not only a pressure reduction process, but also recovers the oxygen-rich gas in the dead space in the adsorption bed. When the pressures of the two containers, adsorption tower 1 and pressure equalization tank 10, are basically close, the pressure equalization valve is closed, and the pressure equalization and pressure reduction process of adsorption tower 1 ends.

[0034] Step 3: Vacuuming process

[0035] After the pressure equalization and depressurization process is completed, adsorption tower 1 immediately enters the vacuuming process. At this time, the vacuum valve is opened, and the gas in adsorption tower 1 flows out against the adsorption direction. Under the action of pressure, the gas is forcibly extracted by the blower (at this time, the blower acts as a vacuum pump). At this time, the nitrogen adsorbed on the adsorbent is gradually desorbed. All the gas in the adsorption tower is extracted by the blower until the impurities in the adsorbent are fully desorbed. Then the vacuum valve is closed, and the vacuuming process ends.

[0036] Step 4: Pressure Equalization and Pressure Increase Process

[0037] This process corresponds to the pressure equalization and depressurization process. After the vacuuming process of adsorption tower 1 is completed, the pressure equalization valve of the adsorption tower is opened. Since the gas pressure in the pressure equalization tank 10 is higher than that in adsorption tower 1 at this time, the gas in the pressure equalization tank 10 flows into adsorption tower 1 under the action of pressure difference. At the same time, the pressure in adsorption tower 1 increases. After the gas comes into full contact with the adsorbent, the nitrogen in it is fully adsorbed by the adsorbent. When the pressures of the two containers, adsorption tower 1 and pressure equalization tank 10, are basically close, the pressure equalization is closed, and the pressure equalization and depressurization process of adsorption tower 1 ends.

[0038] Step 5: Product Gas Pressurization Process

[0039] After the pressure equalization and pressurization process is completed, the oxygen generation valve is opened. Since the gas pressure inside the tower is still low (lower than the product gas pressure), the product oxygen enters the adsorption tower due to pressure. This serves two purposes: one is to use the product gas to blow nitrogen gas that has not yet come into contact with the adsorbent into the adsorbent layer from the top end caps of the adsorption tower, allowing it to come into contact with the adsorbent and be adsorbed; the other purpose is to increase the pressure inside the adsorption tower, bringing it to the adsorption pressure. At this point, the product gas pressurization process in adsorption tower 1 is complete.

[0040] After this process, the adsorption tower completes the entire regeneration process and is ready for the next adsorption cycle.

[0041] When using this utility model, if it is necessary to replace the sieved particles inside the screening frame 7 during the use of the adsorption tower 1, the operator first rotates the cover plate 4 and removes the snap-fit ​​block 403 from the inside of the mounting groove 102. Then, the cover plate 4 is opened, and the operator inserts a hex wrench into the groove 602. By rotating the hex wrench, the screw 6 is rotated. At this time, the screening frame 7, which is threaded on the side surface of the screw 6, will be conveyed to the upper end of the adsorption tower 1 by the screw 6. The operator then removes the screening frame 7 from the inside of the adsorption tower 1, opens the sealing door 702, and replaces the sieved particles inside the screening frame 7. After the replacement is completed, the screening frame 7 is placed on the side surface of the screw 6, and then the screw 6 is rotated in the opposite direction to install the screening frame 7 back in its original position. Finally, the cover plate 4 is placed on the upper end of the adsorption tower 1, and the cover plate 4 is rotated in the opposite direction to seal the adsorption tower 1.

[0042] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Although embodiments of the present utility have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present utility, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single column VPSA oxygen generation plant comprising of adsorption column (1), cooler (2), filter silencer (9), blower (8) and equalizing tank (10) and oxygen buffer tank (11) characterized by: The adsorption tower (1), cooler (2), filter silencer, blower and equalizing tank and oxygen buffer tank are connected by pipes and valves, and the inside of the adsorption tower (1) is provided with a plurality of screening boxes (7), the inside of the screening box (7) is threadedly connected with a lead screw (6), and the lower end of the lead screw (6) is rotatably connected with the inner wall of the adsorption tower (1), the upper end of the adsorption tower (1) is provided with a cover plate (4), and the middle of the cover plate (4) is provided with a through hole (401), the through hole (401) is aligned with the upper end of the lead screw (6), and the inner wall of the through hole (401) is fixedly installed with a sealing ring, the lower end of the adsorption tower (1) is fixedly connected with a supporting leg (5), the upper surface of the cover plate (4) is fixedly connected with an exhaust pipe (402), and the lower surface of the cover plate (4) is fixedly connected with a sealing ring (404), the sealing ring (404) is aligned with the upper end of the adsorption tower (1).

2. The single-column VPSA oxygen generation apparatus of claim 1, wherein: The side surface of the cover plate (4) is fixedly connected with a buckle block (403), the upper end of the cover plate (4) is fixedly connected with a mounting groove (102), and the mounting groove (102) is an L-shaped structure, the upper end of the mounting groove (102) is aligned with the buckle block (403).

3. The single-column VPSA oxygen generation apparatus of claim 1, wherein: The lower surface of the supporting leg (5) is fixedly connected with an anti-skid pad (501), and the side surface of the supporting leg (5) is fixedly connected with two groups of reinforcing plates (502), the reinforcing plates (502) are connected by supporting plates (503).

4. The single-column VPSA oxygen generation apparatus of claim 1, wherein: The side surface of the screening box (7) is fixedly connected with a sealing strip (701), and the upper surface of the screening box (7) is provided with a sealing door (702).

5. The single-column VPSA oxygen generation apparatus of claim 1, wherein: The lower end of the adsorption tower (1) is fixedly connected with an air inlet pipe (101), and one end of the air inlet pipe (101) is fixedly connected with a filter box (3), the inside of the filter box (3) is slidably connected with a filter screen (301), and one side surface of the filter box (3) is fixedly connected with a cooler (2).

6. The single-column VPSA oxygen generation apparatus of claim 1, wherein: The upper surface of the lead screw (6) is provided with a recess (602), and the recess (602) is a hexagonal recess.

Images