VPSA (Vacuum Pressure Swing Adsorption) oxygen production device

Abstract

The embodiment of the utility model provides a VPSA (Vacuum Pressure Swing Adsorption) oxygen production device, which comprises a molecular sieve adsorption tower, a vacuum pressure swing adsorption tower, a vacuum pressure swing adsorption tower, a vacuum pressure swing adsorption tower and a vacuum pressure swing adsorption tower, the pressure equalizing chamber is connected to the molecular sieve adsorption tower and is used as a buffer space for gas in the adsorption switching process; the airflow distribution plate is arranged in the molecular sieve adsorption tower, adopts a stepped structure to uniformly guide the airflow inlet direction, comprises a micro-perforated structure and is used for regulating and controlling the air flow and distribution, and a hydrophilic coating is arranged on the surface of the airflow distribution plate to guide wet air in the air to flow; the adsorbent fixing device is arranged in the molecular sieve adsorption tower and is provided with the adsorbent layer; and the gas-liquid separator is arranged at the top of the molecular sieve adsorption tower and is used for intercepting and discharging condensed water entering along with gas flow. Through the scheme of the embodiment of the invention, the energy consumption can be reduced while the oxygen purity is improved.

Description

Technical Field

[0001] This application relates to the field of gas separation technology, specifically to a VPSA oxygen generator. Background Technology

[0002] VPSA (Vacuum Pressure Swing Adsorption) oxygen generators separate oxygen from the air at room temperature through adsorption and desorption processes. They are characterized by their compact structure, high degree of automation, and low operating costs, and are widely used in industrial, medical, and environmental fields. However, in practical applications, this device faces the technical challenge of reducing energy consumption while improving oxygen purity. Increasing oxygen purity often requires increasing energy consumption in the adsorption cycle, while reducing energy consumption may affect the quality of the product gas. Balancing these two factors becomes a key issue limiting its efficiency optimization and economic viability. Summary of the Invention

[0003] In view of this, the present disclosure provides a VPSA oxygen generator that at least partially solves the problems existing in the prior art.

[0004] This application discloses a VPSA oxygen generator, comprising:

[0005] Molecular sieve adsorption towers are used to separate different components in the air through the selective adsorption and desorption of molecular sieves.

[0006] The equalization chamber, connected to the molecular sieve adsorption tower, serves as a buffer space for the gas during the switching of the adsorption process;

[0007] An airflow distribution plate is disposed inside the molecular sieve adsorption tower. The airflow distribution plate adopts a stepped structure to uniformly guide the airflow inlet direction. The airflow distribution plate includes a micro-perforated structure for regulating airflow and distribution. The surface of the airflow distribution plate is provided with a hydrophilic coating to guide the flow of humid air in the gas.

[0008] An adsorbent fixing device is installed inside the molecular sieve adsorption tower and is provided with the adsorbent layer;

[0009] A gas-liquid separator, installed at the top of the molecular sieve adsorption tower, is used to intercept and remove condensate that enters with the gas flow; wherein...

[0010] The equalizing chamber is connected to the molecular sieve adsorption tower via a sealed pipe; the adsorbent fixing device is in close contact with the inner wall of the molecular sieve adsorption tower; the gas-liquid separator is connected to the molecular sieve adsorption tower and leads to the outlet, so that all components form a continuous and closed operating environment.

[0011] In one specific embodiment, the gap between the multi-layered stepped structure of the airflow distribution plate is between 5 mm and 2 mm to improve the precision of airflow control and reduce energy loss.

[0012] In one specific embodiment, the micro-perforated structure of the airflow distribution plate has a micro-perforation diameter ranging from 2 mm to 8 mm, so as to make the gas distribution uniform and reduce the pressure drop.

[0013] In one specific embodiment, a pressure regulating valve is installed on the sealed pipeline to reduce pressure fluctuations during the switching process.

[0014] In one specific embodiment, the internal cavity structure of the pressure regulating valve is configured as a stepped flow channel to make the gas flow path smoother.

[0015] In one specific embodiment, the adsorbent layer has two layers with a gap between each layer to allow air to pass through smoothly.

[0016] In one specific embodiment, the gas-liquid separator (5) is provided with a drain pipe at the bottom end, and a drain valve is provided on the drain pipe for discharging the separated liquid.

[0017] In one specific embodiment, the sealed pipe adopts a double-layer composite structure, with an inner layer being a soft and wear-resistant layer and an outer layer being a support layer, to enhance the sealing and durability of the pipe.

[0018] This disclosure provides a VPSA oxygen generator, comprising: a molecular sieve adsorption tower for separating different components in air through selective adsorption and desorption of the molecular sieve; a pressure equalization chamber connected to the molecular sieve adsorption tower, serving as a buffer space for the gas during the switching adsorption process; an airflow distribution plate disposed inside the molecular sieve adsorption tower, wherein the airflow distribution plate adopts a stepped structure to uniformly guide the airflow inlet direction, the airflow distribution plate includes a micro-perforated structure for regulating airflow and distribution, and the surface of the airflow distribution plate is provided with a hydrophilic coating to guide the flow of humid air in the gas; an adsorbent fixing device installed inside the molecular sieve adsorption tower and having an adsorbent layer thereon; and a gas-liquid separator disposed at the top of the molecular sieve adsorption tower for intercepting and removing condensate entering with the airflow; wherein the pressure equalization chamber is connected to the molecular sieve adsorption tower via a sealed pipe; the adsorbent fixing device is in close contact with the inner wall of the molecular sieve adsorption tower; and the gas-liquid separator is connected to the molecular sieve adsorption tower and leads to the outlet, so that all components form a continuous and closed operating environment. The solution provided by this disclosure provides a way to improve oxygen purity while reducing energy consumption. Attached Figure Description

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0020] Figure 1 This is a schematic diagram of the structure of a VPSA oxygen generator according to the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the molecular sieve adsorption tower in a VPSA oxygen generator according to the present invention;

[0022] Figure 3 This is an exploded schematic diagram of the airflow distribution plate in a VPSA oxygen generator according to the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the sealed pipeline in a VPSA oxygen generator according to the present invention.

[0024] In the diagram: 1. Molecular sieve adsorption tower; 2. Pressure equalization chamber; 3. Airflow distribution plate; 31. Step structure; 32. Micro-perforation; 33. Hydrophilic coating; 4. Adsorbent fixing device; 5. Gas-liquid separator; 6. Pressure regulating valve; 7. Sealed pipeline; 8. Adsorbent layer; 9. Drain pipe; 10. Drain valve; 11. Polytetrafluoroethylene material layer; 12. Corrosion-resistant stainless steel layer. Detailed Implementation

[0025] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] In this invention, "VPSA" is an abbreviation for Vacuum Pressure Swing Adsorption Technology.

[0027] like Figure 1As shown, a VPSA oxygen generation device of this application includes a molecular sieve adsorption tower 1, a pressure equalization chamber 2, an airflow distribution plate 3, an adsorbent fixing device 4, a gas-liquid separator 5, and pipes or sealed interfaces connecting these components. Each component achieves an oxygen generation process that optimizes oxygen purity and energy consumption through special design and functional integration.

[0028] As the core component of the oxygen production unit, the molecular sieve adsorption tower 1 is primarily responsible for separating different components in the air through the selective adsorption and desorption processes of molecular sieves. Specifically, the molecular sieve adsorption tower 1 provides an internal environment that allows compressed gas to enrich oxygen and other inert gases by passing through specifically arranged adsorption materials, such as releasing nitrogen from the surface of the adsorption materials through pressure swing or vacuum technology. The internal dimensions of this device require precise design to reduce vortex losses and the impact of ineffective volume, further reducing energy consumption and improving process performance.

[0029] The equalizing chamber 2 is connected to the molecular sieve adsorption tower 1 and serves as a buffer space to stabilize the system pressure during adsorption process switching. Its main technical implementation involves using high-strength materials to manufacture a sealed cavity, and connecting all components through pipelines to ensure there are no leaks in the entire system. The equalizing chamber 2 is also equipped with pressure detection equipment to monitor real-time pressure values ​​during operation and feed them back to the control center for adjusting valve opening / closing times or other operating conditions.

[0030] The airflow distribution plate 3 is a component installed inside the molecular sieve adsorption tower 1. It uses a stepped structure 31 and micro-perforation 32 technology to improve the flow direction of the incoming gas (see details). Figure 3 The stepped structure 31 is designed to guide the high-speed airflow flowing in from the inlet to gradually decelerate and disperse throughout the entire cross-section of the adsorption tower. Furthermore, the plate includes micro-perforations 32, which, through small openings in the physical structure, limit and regulate the width and position of the gas channels, thereby achieving precise flow rate regulation. To address the challenges posed by humid gas environments, the surface is treated with a hydrophilic coating to effectively absorb moisture and prevent moisture condensation from interfering with the working efficiency of the molecular sieve layer. This measure significantly improves gas contact efficiency and promotes the generation of high oxygen content extraction rates.

[0031] The adsorbent fixing device 4 is arranged at the inner boundary of the molecular sieve adsorption tower 1, closely fitting the inner wall of the tower. This fixing method ensures that the adsorbent operates at a defined level without relative displacement. It typically consists of a metal frame or a grid-like mesh system made of high-temperature resistant polymer, which can be attached to the inner wall surface of the adsorption tower using bolts, welding, or embedding. The presence of the fixing device not only improves the operational stability of the entire device but also extends the adsorbent's lifespan, indirectly reducing the heat energy required for regeneration cycles.

[0032] The gas-liquid separator 5, located at the top of the molecular sieve adsorption tower 1, primarily removes condensed moisture from the gas stream, protecting the output gas from additional impurities. It utilizes the principle of gravity settling in its separation structure; for example, cyclone-shaped channels allow liquid particles to be thrown away from the main gas stream, moving to the periphery and collecting in the internal storage tank. Finally, they are discharged through a dedicated drain outlet into an external container for storage or disposal. Because this stage reduces unnecessary additional loads (such as the useless heat demand caused by moisture evaporation), it plays a crucial role in reducing energy consumption while ensuring that the product gas quality meets industrial standards.

[0033] Finally, the key to solving the problem of improving oxygen purity while reducing energy consumption lies in several important innovations: First, the design of the airflow distribution plate 3 optimizes the uniformity of air diffusion and the rationality of path planning inside the adsorption tower, reducing the problem of wasted adsorption capacity due to improper airflow distribution; second, the gas-liquid separator 5 successfully intercepts the moisture carried by the airflow, preventing the molecular sieve from failing prematurely due to frequent exposure to moisture; and third, the introduction of the equalization chamber 2 improves the dynamic stability of the system, avoiding additional energy demand caused by sudden pressure changes.

[0034] like Figure 3 As shown, in one embodiment, the airflow distribution plate 3 of a VPSA oxygen generator of this application is disposed inside the molecular sieve adsorption tower 1, which optimizes the gas flow path in the adsorption tower through a multi-layer stepped structure 31. The airflow distribution plate 3 consists of multiple parallel stepped stages, which maintain specific gaps to regulate the airflow direction and flow rate, and ensure that air can be uniformly diffused to the adsorbent layer 8. Specifically, the gap size between these stages is designed to decrease progressively from 5 mm to 2 mm. This gap variation helps to reduce local pressure drop while precisely controlling airflow characteristics.

[0035] The airflow distribution plate 3 also includes a micro-perforated structure 32, the diameter and arrangement of which are customized according to airflow requirements. In this way, the micro-perforations 32 work in conjunction with the stepped structure 31 to further achieve precise airflow distribution. Furthermore, to adapt to humid air environments and optimize gas flow behavior, a hydrophilic coating 33 is applied to the surface of the airflow distribution plate 3, guiding the moisture distribution rationally without interfering with the overall process. In addition, the entire airflow distribution plate 3 is firmly installed on the upper part of the inner wall of the adsorption tower, directly contacting the adsorbent fixing device 4, thereby ensuring stability during operation.

[0036] For example, the ladder structure 31 can achieve the desired gap range by adjusting the welding position between each ladder step or fixing the support rods. By strictly controlling the processing error of each ladder step, the precision requirements between different gap levels can be effectively guaranteed, while simplifying manufacturing complexity and reducing assembly deviations.

[0037] like Figure 2 As shown, in one embodiment, the airflow distribution plate 3 of a VPSA oxygen generator of this application adopts a special micro-perforated 32 structure design, wherein the diameter of the micro-perforated 32 is set to range from 2 mm to 0.8 mm. This micro-perforated 32 structure is uniformly distributed inside the airflow distribution plate 3 and works in conjunction with the stepped structure 31 to ensure that the gas entering the molecular sieve adsorption tower 1 can be more rationally distributed, avoiding the problem of excessively concentrated or dispersed local airflow. Furthermore, combined with the hydrophilic coating 33 on the surface of the airflow distribution plate 3, the micro-perforated 32 structure further optimizes the path guidance of humid air during the adsorption process, ensuring the stability of the working environment and adsorption efficiency of the molecular sieve.

[0038] For example, the aforementioned micro-perforations 32 can be fabricated inside the airflow distribution plate 3 using laser drilling or mechanical drilling techniques, while adjusting the pore size and density layout to adapt to different working pressures and flow rate requirements. The airflow distribution plate 3 is assembled on one side of the inner wall of the molecular sieve adsorption tower 1, adjacent to the outlet of the equalizing chamber 2, ensuring that the airflow can smoothly flow to the adsorbent layer 8 after passing through the distribution plate. This installation method, combined with the design features of the micro-perforated 32 structure, significantly improves airflow characteristics without affecting the overall airtightness.

[0039] like Figure 2 and Figure 3 As shown, in one embodiment, the airflow distribution plate 3 of a VPSA oxygen generator of this application is coated with a hydrophilic coating 33 made of nano-silica material to enhance the guidance of the humid airflow path. The airflow distribution plate 3 is located inside the molecular sieve adsorption tower 1 and is installed in conjunction with the adsorbent fixing device 4 to ensure that it covers the air inlet area while avoiding any impact on the structure of the adsorbent layer 8. The airflow distribution plate 3 has a multi-level stepped structure 31 for dispersing the airflow, and the micro-perforations 32 are designed to precisely adjust the gas flow rate entering the adsorption tower. Combined with its special hydrophilic coating 33, it forms a complete performance system. In actual operating conditions, when humid air flows through this distribution plate, the moisture is less likely to condense and accumulate on a large scale due to the directional guidance of the hydrophilic coating 33.

[0040] For example, firstly, a basic component, the airflow distribution plate 3, featuring a stepped structure 31 and uniformly distributed micro-perforations 32, is formed through machining. Then, a hydrophilic coating 33 made of nano-silica material within a specific thickness range is applied to its surface using a spraying method to ensure strong adhesion and integrity of the coating's physical properties, thus meeting the requirements of complex operating conditions. Finally, the component is precisely installed and fixed to the corresponding position within the molecular sieve adsorption tower 1 and connected to the pipeline to achieve the overall assembly effect.

[0041] like Figure 1As shown, in one embodiment, one feature of the VPSA oxygen generator of this application is the optimized design of the sealed pipeline 7 and the pressure regulating valve 6. To reduce performance changes caused by pressure fluctuations during adsorption tower switching, a pressure regulating valve 6 is installed on the sealed pipeline 7. The pressure regulating valve 6 is specifically connected to the section of the sealed pipeline 7 between the equalization chamber 2 and the molecular sieve adsorption tower 1 to achieve a stabilizing effect during gas flow direction switching. This component is fixed to the outside of the sealed pipeline 7 by a flange or thread and communicates with its internal flow path. Furthermore, the design of the pressure regulating valve 6 ensures that it has an appropriate opening and closing range and sensitive response, avoiding excessive damping that could restrict gas flow.

[0042] For example, the above functions can be achieved by using a spring-loaded direct-acting pressure regulating valve 6, which controls the valve's opening and closing points through a preset spring force, while simultaneously adjusting the inlet pressure to a set range. The main body of the pressure regulating valve 6 is made of a high-hardness material to resist structural fatigue under high-pressure conditions. Specifically, the valve's internal cavity structure is designed as a stepped flow channel, making the gas flow path smoother, and the pressure stability characteristics are further optimized by fine-tuning the dimensions of the internal components.

[0043] like Figure 2 As shown, in one embodiment, the adsorbent layer 8 of the VPSA oxygen generator of this application consists of two layers, and its functionality is ensured through a specific design. The adsorbent layer 8 is located inside the molecular sieve adsorption tower 1, and there is a certain spacing between each layer. This spacing is precisely defined and maintained by the adsorbent fixing device 4, thereby preventing the adsorbent from shifting or agglomerating during operation. This structure ensures smooth gas flow during the adsorption process, while allowing the gas flow to uniformly contact the adsorbent surface.

[0044] The adsorbent layer 8 is installed in the core area of ​​the molecular sieve adsorption tower 1. The two layers of adsorbent are fixed and positioned from all sides by the adsorbent fixing device 4 to ensure their stability under dynamic operating conditions. The distance between the two layers of adsorbent is precisely calculated and set; this gap does not interfere with the airflow direction but rather creates more favorable conditions for airflow distribution. Furthermore, the adsorbent fixing device 4 is tightly attached to the inner wall of the molecular sieve adsorption tower 1, further reinforcing the overall airtightness and reliability of the mechanism.

[0045] For example, the spacing between the two layers of adsorbent can be set by adjusting the adjustment components or brackets on the adsorbent fixing device 4. Specifically, these adjustment components can achieve millimeter-level precise positioning, thereby achieving effective control of the adsorbent spacing and ensuring that the equipment always maintains an ideal technical state during actual operation.

[0046] like Figure 1As shown, in one embodiment, the gas-liquid separator 5 of the VPSA oxygen generator of this application is provided with a drain pipe 9 at the bottom for discharging liquid. A drain valve 10 is also installed on the drain pipe 9 to achieve controlled discharge of the separated liquid. The gas-liquid separator 5 is located in the top region of the molecular sieve adsorption tower 1 and is mainly used to separate condensate or impurity liquid carried by the gas. The drain pipe 9 extends from the bottom of the gas-liquid separator 5, forming a vertical or slightly downward-sloping pipe structure to facilitate smooth liquid discharge. The drain valve 10 is installed in the middle section of the drain pipe 9, and the liquid discharge state is determined by adjusting the valve opening.

[0047] For example, the connection between the gas-liquid separator 5 and the drain pipe 9 can be achieved through welding or flange fixing, ensuring a tight and leak-free connection. The drain pipe 9 is made of metal with a corrosion-resistant coating to extend its service life. Meanwhile, the drain valve 10 is selected as a manual or automatic valve type suitable for the operating conditions and installed in an easily accessible location according to the specific usage environment. Specifically, this device can prevent the accumulation of liquid substances from adversely affecting gas purity by rationally setting the opening and closing logic of the drain valve 10 during actual operation.

[0048] like Figure 4 As shown, in one embodiment, the sealing pipe 7 of a VPSA oxygen generator according to this application is made of a double-layer composite material. The inner layer is composed of polytetrafluoroethylene (PTFE), which has excellent high-temperature resistance, chemical stability, and a low coefficient of friction, suitable for ensuring smooth airflow and sealing performance during transmission. The outer layer is made of corrosion-resistant stainless steel to improve the overall structure's durability and mechanical strength under complex operating conditions. This design gives the sealing pipe 7 excellent corrosion resistance, thus adapting to the complex working environment requirements between the molecular sieve adsorption tower 1 and the equalization chamber 2.

[0049] Further, the PTFE (polytetrafluoroethylene) material layer, as the inner layer, is tightly bonded to the inside of the pipe, forming a complete sealing surface to prevent air leakage. An outer layer of corrosion-resistant stainless steel wraps around the PTFE material layer, providing mechanical protection and enhanced corrosion resistance. The two layers are connected seamlessly using a specialized process. Specifically, during pipe installation, both ends are fixed to the equalization chamber 2 and the molecular sieve adsorption tower 1 using flange connections, ensuring that the overall airtightness requirements of the system are met.

[0050] For example, the two-layer materials can be bonded together using a high-temperature thermoplastic process, and high-performance sealing gaskets can be used to reinforce the connection points during actual assembly, thus ensuring the practical realization of this feature.

[0051] In actual operation, when this device is in use, compressed air first enters the molecular sieve adsorption tower 1. Under the action of the internal airflow distribution plate 3, the air is evenly distributed and selectively adsorbed through the adsorbent layer 8. Unwanted gases such as nitrogen are separated out, while oxygen is enriched. Subsequently, before the end of the adsorption cycle, a portion of the high-pressure gas is introduced into the pressure equalization chamber 2 through the sealed pipe 7 connecting the molecular sieve adsorption tower 1 and the pressure equalization chamber 2 to balance the pressure and prepare for switching to the next adsorption tower. During the desorption stage, the low-pressure state causes the adsorbed substances to desorb from the surface of the molecular sieve, and the waste gas is discharged outside the device. In addition, the moisture and condensate generated during the adsorption process are intercepted and discharged by the gas-liquid separator 5 to ensure the purity of the output gas. Throughout the process, the adsorbent fixing device 4 stabilizes the position of the adsorbent layer 8, preventing it from loosening due to airflow impact, thereby ensuring the long-term stable operation of the device and improving oxygen purity and production efficiency.

[0052] This document describes several embodiments of the present invention; however, for the sake of brevity, the descriptions of the embodiments are not exhaustive, and identical or similar features or parts between the embodiments may be omitted. In this document, "one embodiment," "some embodiments," "example," "specific example," or "some examples" refers to embodiments applicable to at least one, but not all, of the present invention. The above terms do not necessarily refer to the same embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of the different embodiments or examples.

[0053] The exemplary systems and methods of the present invention have been specifically shown and described with reference to the above embodiments, which are merely examples of the best mode for implementing the systems and methods. Those skilled in the art will understand that various changes can be made to the embodiments of the systems and methods described herein without departing from the spirit and scope of the invention as defined in the appended claims when implementing the systems and / or methods.

Claims

1. A VPSA oxygen generation plant, characterized in that, Comprising: a molecular sieve adsorption tower (1) for separating different components in air by selective adsorption and desorption of molecular sieve; an equalization chamber (2) connected to the molecular sieve adsorption tower (1) for use as a buffer space for gas during switching adsorption process; an air flow distribution plate (3) arranged inside the molecular sieve adsorption tower (1), wherein the air flow distribution plate (3) adopts a stepped structure (31) to uniformly guide the air flow inlet direction, the air flow distribution plate (3) contains a micro-perforated structure (32) for regulating air flow and distribution, and the surface of the air flow distribution plate (3) is provided with a hydrophilic coating (33) to guide the flow of wet air in the gas; an adsorbent fixing device (4) installed in the molecular sieve adsorption tower (1) and provided with an adsorbent layer (8); a gas-liquid separator (5) arranged at the top of the molecular sieve adsorption tower (1) for intercepting and removing condensed water entering with the gas flow; wherein the equalization chamber (2) and the molecular sieve adsorption tower (1) are connected through a sealed pipeline (7); the adsorbent fixing device (4) is closely attached to the inner wall of the molecular sieve adsorption tower (1); and the gas-liquid separator (5) is connected to the molecular sieve adsorption tower (1) and leads to the outlet, so that all components form a coherent and closed operating environment.

2. A VPSA oxygen generation plant as claimed in claim 1, wherein: The gap size between the multi-layer stepped structure (31) of the air flow distribution plate (3) is between 5 mm and 2 mm, to improve the regulation accuracy of air flow and reduce energy loss.

3. A VPSA oxygen generation plant as claimed in claim 1, wherein: In the micro-perforated structure (32) of the air flow distribution plate (3), the micro-perforated diameter ranges from 2 mm to 0.8 mm, to make the gas distribution uniform and reduce the pressure drop.

4. The VPSA oxygen generation plant of claim 1, wherein: A pressure stabilizing valve (6) is installed on the sealed pipeline (7) to reduce pressure fluctuations during switching.

5. A VPSA oxygen generation plant as claimed in claim 4, wherein: The inner cavity structure of the pressure stabilizing valve (6) is arranged in a stepped flow channel to make the gas flow path smoother.

6. A VPSA oxygen generation plant as claimed in claim 1, wherein: The adsorbent layer (8) has two layers with a gap between each layer to allow smooth air passage.

7. A VPSA oxygen generation plant as claimed in claim 1, wherein: The gas-liquid separator (5) is provided with a drain pipe (9) at the bottom end, and a drain valve (10) is arranged on the drain pipe (9) to drain the separated liquid.

8. A VPSA oxygen generation plant as claimed in claim 1, wherein: The sealed pipeline (7) adopts a double-layer composite structure, with a soft and wear-resistant inner layer and a supporting outer layer to enhance the sealing performance and durability of the pipeline.

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