Single-tower VPSA (Vacuum Pressure Swing Adsorption) oxygen production device adopting positive and negative pressure all-in-one machine

Abstract

The embodiment of the utility model provides a single-tower VPSA (Vacuum Pressure Swing Adsorption) oxygen generation device adopting a positive and negative pressure all-in-one machine, which comprises an oxygen generation tower body used for loading a filler and performing pressure swing adsorption operation, a filter arranged at a gas inlet of the oxygen generation tower body to filter impurities in gas entering the oxygen generation tower body, and a positive and negative pressure all-in-one machine, wherein the filter is provided with a rotatable flushing rod and a back flushing gas channel, reverse airflow generated in a positive pressure state is used for instantly flushing a filtering layer, a filtering material layer is arranged in the filter to intercept particles, a slag discharging pipe is arranged at the position, located at the lowest end of the filtering material layer, of the filter, and the slag discharging pipe is used for discharging slag. The slag discharge pipe is also provided with a control valve for controlling the on-off of the slag discharge pipe; the positive and negative pressure all-in-one machine is used for alternately applying vacuum extraction and pressurized filling; and the positive and negative pressure all-in-one machine is connected with the oxygen production tower body through a special connecting pipe. Through the scheme of the embodiment of the invention, unsmooth airflow caused by impurity accumulation can be reduced.

Description

A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit Technical Field

[0001] This application relates to the field of gas separation technology, specifically to a single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit. Background Technology

[0002] The single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit is a gas separation device based on vacuum pressure Swing Adsorption (VPSA) technology. Through a single adsorption tower and an integrated positive and negative pressure design, it can efficiently extract and purify oxygen. This device combines adsorption, desorption, and recovery processes, significantly improving operating efficiency and simplifying the system structure. However, in practical applications, due to the presence of various impurities in the air, these impurities may gradually accumulate on the surface of the adsorption material. Over time, this can lead to narrowing of the airflow channel, causing airflow obstruction and affecting the overall oxygen production efficiency and stability. Summary of the Invention

[0003] In view of this, the present disclosure provides a single-tower VPSA oxygen generator that employs an integrated positive and negative pressure unit, which at least partially solves the problems existing in the prior art.

[0004] This application discloses a single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit, comprising:

[0005] The oxygen generation tower body is used to load packing materials and for pressure swing adsorption operations.

[0006] A filter is installed at the air inlet of the oxygen generating tower to filter impurities in the gas entering the oxygen generating tower; wherein the filter is equipped with a rotatable cleaning rod, the filter is equipped with a backflush gas channel, and the filter layer is instantaneously flushed by the reverse airflow generated under positive pressure; the filter is equipped with a filter media layer to intercept particulate matter; a slag discharge pipe is installed at the lowest end of the filter media layer, and the slag discharge pipe is also equipped with a control valve to control the opening and closing of the slag discharge pipe;

[0007] The positive and negative pressure integrated machine is used to alternately apply vacuum extraction and pressurized filling; the positive and negative pressure integrated machine is connected to the oxygen generation tower body through a special connecting pipe.

[0008] An exhaust pipe is installed at the top of the oxygen generating tower.

[0009] The gas outlet regulating valve is installed on the exhaust pipe and is used to regulate the output of purified oxygen and control the pressure.

[0010] Preferably, the filter is inclined and connected to the outer wall of the oxygen tower via a support frame, so that larger particles naturally slide off due to gravity when air enters.

[0011] Preferably, the rotatable cleaning rod is equipped with a cleaning brush for removing sticky dust.

[0012] Preferably, the rotatable cleaning rod is connected to a stepper motor to control the rotation speed and the timing of rotation and stop.

[0013] Preferably, an airflow disk is fixed at one end of the backflush gas channel, and multiple sets of nozzles are arrayed at the top of the airflow disk to accelerate the impact force of the reverse jet.

[0014] Preferably, the gas passage is further provided with a solenoid valve for controlling the opening and closing of the gas passage.

[0015] Preferably, the positive and negative pressure integrated machine is equipped with an integrated pulse generator, which can trigger brief but intense pressure pulsations in the later stages of the filtration process.

[0016] Preferably, a conical guide is provided on the dedicated connecting pipe near the edge of the inner wall of the oxygen generating tower to allow air to flow tangentially along the inner wall.

[0017] Preferably, a pressure stabilizing valve is installed between the dedicated connecting pipe and the positive and negative pressure integrated machine to maintain the system pressure within a suitable range.

[0018] Preferably, the oxygen generating tower body has an observation window at a corresponding position on its side and is equipped with an inspection panel to facilitate viewing the internal condition.

[0019] This disclosure provides a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit, comprising: an oxygen generator tower body for loading packing material and pressure swing adsorption operation; a filter disposed at the air inlet of the oxygen generator tower body to filter impurities in the gas entering the oxygen generator tower; wherein the filter is equipped with a rotatable cleaning rod, the filter is provided with a backflush gas channel, utilizing the reverse airflow generated under positive pressure to instantaneously flush the filter layer, the filter contains a filter media layer to intercept particulate matter, a slag discharge pipe is disposed at the lowest end of the filter media layer, the slag discharge pipe is also provided with a control valve to control the opening and closing of the slag discharge pipe; a positive and negative pressure integrated unit for alternately applying vacuum extraction and pressurized filling; the positive and negative pressure integrated unit is connected to the oxygen generator tower body via a dedicated connecting pipe; an exhaust pipe is disposed at the top of the oxygen generator tower body; a gas outlet regulating valve is disposed on the exhaust pipe for regulating the output of purified oxygen and controlling pressure. The solution of this disclosure embodiment can solve the problem of reducing airflow obstruction caused by impurity accumulation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the exemplary embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 is a schematic diagram of the structure of a single-tower VPSA oxygen generator with an integrated positive and negative pressure unit according to the present invention.

[0022] Figure 2 is a rear view of a single-tower VPSA oxygen generator with an integrated positive and negative pressure unit as described in this utility model;

[0023] Figure 3 is a schematic diagram of the filter structure in a single-tower VPSA oxygen generator with integrated positive and negative pressure as described in this utility model;

[0024] Figure 4 is a schematic diagram of the internal structure of the filter in a single-tower VPSA oxygen generator with integrated positive and negative pressure as described in this utility model.

[0025] In the diagram: 1. Filter; 11. Cleaning brush rod; 12. Backflush gas channel; 13. Slag discharge pipe; 14. Control valve; 2. Positive and negative pressure integrated unit; 3. Oxygen generating tower body; 4. Regulating valve; 5. Exhaust pipe; 51. Support frame; 52. Filter media layer; 53. Cleaning brush; 54. Stepper motor; 55. Airflow disc; 56. Nozzle; 57. Solenoid valve; 58. Pulse generator; 59. Conical guide; 60. Pressure regulating valve; 61. Observation window Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings. The illustrative implementation methods and descriptions of the embodiments of this disclosure are only used to explain the embodiments of this disclosure and are not intended to limit the embodiments of this disclosure.

[0027] In this invention, "VPSA" is an abbreviation for Vacuum Pressure Swing Adsorption Technology.

[0028] As shown in Figure 1, a single-tower VPSA oxygen generator using an integrated positive and negative pressure unit 2 according to this application includes a filter 1, an oxygen generator tower 3, an integrated positive and negative pressure unit 2, and a gas outlet regulating valve 4. The specific structure of each component and its installation method will be described in detail below.

[0029] Filter 1 is installed at the air inlet of oxygen generator tower 3 to pre-treat the gas entering the tower 3 to remove impurities. It consists of a main filter component and a set of auxiliary cleaning devices. The main filter component is a multi-layer composite filter material structure, effectively intercepting airborne particles. To improve the efficiency of filter 1 and reduce the risk of clogging, filter 1 also includes a rotatable cleaning rod 11 (see Figure 4). The rotatable cleaning rod 11 is driven by a motor and maintains slight contact with the filter material surface, physically scraping away accumulated dust particles during periodic operation. Simultaneously, filter 1 is equipped with a backflush gas channel 12. This backflush gas channel 12 is connected to the pressure output end of the positive and negative pressure integrated unit 2. When the oxygen generation system is in the pressurization phase, the generated instantaneous positive pressure airflow can be used to backflush the filter layer through a specific pipe, further improving the cleaning effect and technical feasibility.

[0030] The oxygen generator tower 3, as the main component of the device, is primarily used to load the packing material and implement the pressure swing adsorption (PSA) process. It features a high-strength outer shell to withstand pressure differences caused by changes in the internal and external environment, and is filled with high-performance molecular sieves and other adsorbent materials. The oxygen generator tower 3 not only provides a sealed reaction space but also serves as a foundation platform for the filter 1 and other related components. Its design allows for connection to external devices via top and bottom piping, facilitating the introduction of feed gas and the output of the target product gas. Furthermore, the internal geometry of the oxygen generator tower 3 is optimized to enhance gas flow uniformity and reduce unnecessary energy consumption and mechanical losses.

[0031] The integrated positive and negative pressure unit 2 is a key power device for realizing gas circulation within the oxygen generation tower 3 and driving the molecular sieve regeneration process. It combines vacuum extraction and pressurized filling functions in a highly integrated manner, enabling precise alternating application of two pressure conditions according to system control requirements. The integrated positive and negative pressure unit 2 forms a stable connection with the oxygen generation tower 3 through a dedicated connecting pipe, continuously maintaining the system's specified pressure range under normal operating conditions to ensure the stability and high efficiency of the pressure swing adsorption process. For example, during regeneration, the unit can rapidly reduce the pressure within the oxygen generation tower, extracting the adsorbed components from the saturated adsorbent to restore its activity; while in the subsequent pressurization stage, it can provide an appropriate level of positive thrust to support a new round of adsorption cycle.

[0032] The gas outlet regulating valve 4 is located on the exhaust pipe 5, directly mounted on the top of the oxygen generator tower 3. It is primarily used to monitor, regulate, and control the oxygen discharge flow rate and final pressure. This valve features rapid response and precise control, and its operating logic is closely linked to the real-time status within the oxygen generator tower. The gas outlet regulating valve 4 is securely assembled using flanges or welding, forming a reliable and tightly connected gas flow path with the oxygen generator tower 3. When the system pressure or concentration reaches a preset value, the valve automatically adjusts its opening to ensure that the target oxygen quality delivered from the exhaust pipe 5 meets the usage standards. This also helps optimize resource utilization and improve overall production efficiency.

[0033] Through the aforementioned structural features, a single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit 2 can effectively address the technical challenge of airflow obstruction caused by impurity accumulation. Specifically, the filter 1 within the device integrates multiple innovative methods. On one hand, it uses high-efficiency filter media to initially intercept larger particulate impurities in the air, preventing them from directly intruding into critical operating areas. On the other hand, combined with a dynamically rotatable cleaning rod 11, it promptly cleans small dust particles adhering to the surface, thereby slowing down the rate of filter media blockage. Simultaneously, the periodically changing pressure state inside the oxygen generator tower activates the backflush gas channel 12 to complete additional cleaning. This interconnected technology significantly reduces the maintenance frequency after long-term operation, substantially extends the service life of the filter 1, and ensures smoother operation of the entire system.

[0034] As shown in Figure 1, in one embodiment, a filter 1 of a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit 2 is installed at the air inlet of the oxygen generator tower 3. The filter 1 is arranged at an inclined angle along its air inlet path. This inclined arrangement aims to alter the trajectory of larger particles in the incoming air, guiding these particles to slide off the filter media surface under gravity. Specifically, this inclined position enhances the filter 1's effectiveness in intercepting coarse particles while reducing the decrease in filtration efficiency caused by particle accumulation. Furthermore, a connecting structure is provided between the filter 1 and the exterior of the oxygen generator tower 3, providing stable support and ensuring that the filter assembly is not easily displaced or loosened by fluid impact during system operation.

[0035] For example, the connection structure consists of a metal support frame 51, which is fixed to the outer wall of the oxygen generator tower and both ends of the filter 1 by welding or fasteners, so that the entire filter component remains firm and stable. Specifically, to achieve the above characteristics, the filter 1 can be placed at the air inlet during the assembly process, and then the configuration of the support frame 51 can be adjusted to form a predetermined angle between the two to complete the spatial positioning and technical assembly that meet the process requirements.

[0036] As shown in Figure 4, in one embodiment, the filter 1 of a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit 2 of this application is equipped with a dedicated filter media layer 52 for intercepting impurity particles in the incoming gas, thereby reducing the impact of particulate matter on subsequent molecular sieve or oxygen generation processes. Specifically, the filter media layer 52 is typically made of a material with high-efficiency capture performance and excellent air permeability, and is securely installed in the main channel area inside the filter 1 using a fastening structure. To facilitate the removal of impurities accumulated in the filter media layer 52, a slag discharge assembly is provided at the lowest point where the filter media layer 52 is located. The slag discharge assembly consists of a pipe and a control valve 14. The valve can be precisely operated to close or open the pipe, thereby allowing the collected particulate matter to be periodically discharged from the filter 1.

[0037] For example, the combination of the slag discharge pipe 13 and the control valve 14 can be threaded or flanged to connect to the bottom of the filter 1, ensuring a well-sealed passage when discharge is required. Meanwhile, the control valve 14 can be electrically, pneumatically, or otherwise remotely driven to facilitate automated operation. This arrangement, combined with the valve's precise control capabilities, can flexibly adapt to different sewage discharge needs. Specifically, the outlet of the slag discharge assembly can point to a dedicated container for centralized waste collection, preventing environmental pollution or clogging of other parts of the equipment.

[0038] As shown in Figure 4, in one embodiment, the rotatable cleaning rod 11 of a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit 2 is equipped with a cleaning brush 53 to enhance physical cleaning capabilities and remove deposits from the surface of the filter 1. The cleaning brush 53 is installed at the end of the rotatable cleaning rod 11 and is evenly distributed along its length. This design ensures that the cleaning brush 53 can cover the entire filter layer surface, effectively removing dust and sticky particulate matter during equipment operation intervals. The rotatable cleaning rod 11 is securely connected to the internal structure of the filter 1, specifically by being nested in the inner wall of the filter 1 housing via a support bearing or similar rotating mechanism, allowing the cleaning rod 11 to rotate stably under a specific driving force.

[0039] For example, the cleaning brush 53 can be rotated by a small drive motor at one end of the cleaning brush rod 11 or by using torque provided by an external transmission component, thereby driving the cleaning brush 53 to act on the surface of the filter media. Meanwhile, the cleaning brush 53 is made of a wear-resistant and flexible material to avoid damaging the filter layer while ensuring good cleaning efficiency. During this process, the contact method between the cleaning brush 53 and the filter media is optimized to maintain an appropriate contact force, ultimately improving the overall reliability of the device and its long-term cleaning performance.

[0040] As shown in Figure 4, in one embodiment, the cleaning system of a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit 2 incorporates a rotatable cleaning rod 11 connected to a stepper motor 54. This rotatable cleaning rod 11 is located inside the filter 1 near the filter media and has a multi-branched flexible scraper or rigid brush head structure, designed to accommodate different types of contaminant removal needs. The stepper motor 54 is mounted outside the filter 1 housing and connected to the rotatable cleaning rod 11 via a transmission mechanism or a direct axial connection, providing precise rotational power output and pause control. This layout ensures that the frequency of the cleaning action can be controlled, while avoiding the impact of over-cleaning or incomplete cleaning on overall performance.

[0041] Specifically, by programming the operating angle and interval sequence of the stepper motor 54, the cleaning brush 11 can initiate one or more cleaning operations within a specific adsorption cycle. Furthermore, the drive signal of the stepper motor 54 is synchronized to the working phase of the positive and negative pressure integrated machine 2 to ensure that its operation does not interfere with the adsorption process, thereby ensuring that the equipment always maintains a highly efficient and stable operating state.

[0042] As shown in Figure 4, in one embodiment, the unique design of the backflush gas channel 12, which employs a positive and negative pressure integrated unit 2, is characterized by its distinctive design. A specially designed airflow disk 55 is fixed to one end of the backflush gas channel 12 via fastening components, ensuring a secure position. Multiple sets of nozzles 56 are arranged at the top of the airflow disk 55, distributed in an array on its surface to form a uniform spray area. The number and arrangement of the nozzles 56 can be optimized according to specific process requirements, thereby allowing gas to be ejected at high speed from the nozzles 56, thus accelerating the impact of the reverse airflow on the filter membrane surface.

[0043] Specifically, the airflow disc 55 and the nozzle 56 are fixed by mechanical connection or welding, ensuring a tight overall assembly and high sealing performance to prevent leakage from affecting performance. For example, the airflow disc 55 can be connected to the backflush gas channel 12 via a flange structure, while multiple sets of nozzles 56 are fixed to the surface of the airflow disc 55 by embedding. This enhances the backflush airflow force and effectively prevents excessive local pressure from damaging the filter membrane.

[0044] As shown in Figures 2 and 3, in one embodiment, the gas channel of a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit 2 is equipped with a solenoid valve 57 for controlling on / off operation. This solenoid valve 57 is installed on the gas channel, positioned between the filter 1 and the positive and negative pressure integrated unit 2. The solenoid valve 57 is installed via a threaded connection or flange fixation, maintaining a tight seal with the gas channel to prevent gas leakage. Its main function is to cut off or open the gas channel at specific times, coordinating with the oxygen generator system's cleaning operation procedures to achieve effective maintenance of the filter 1.

[0045] Specifically, to achieve periodic cleaning of filter 1, solenoid valve 57 can be opened or closed at set times by the control system. For example, during the backflushing operation, the control system activates solenoid valve 57 to close the gas passage, causing the reverse airflow generated by the positive and negative pressure integrated machine 2 to concentrate in the direction of filter 1. At this time, the backflushing airflow in the gas passage can effectively flush away the impurity particles accumulated on the surface of the filter media. During other operating periods, solenoid valve 57 is in the open state to ensure unobstructed normal air supply path, and works in conjunction with the rotatable cleaning rod 11 to complete the overall cleaning process. This structural design is reasonable and easy to integrate into existing systems, which helps to improve the long-term stability of the system.

[0046] As shown in Figures 1 and 2, in one embodiment, the positive and negative pressure integrated unit 2 of the single-tower VPSA oxygen generator of this application includes an integrated pulse generator 58, which is designed to be embedded inside or closely integrated with the positive and negative pressure integrated unit 2. It is connected to the oxygen generation tower 3 via precision connecting pipelines and can generate high-intensity, short-cycle pressure pulsation signals when the pressure swing adsorption process is nearing its end. The integrated pulse generator 58 mainly consists of a pressure oscillation unit and a control module. The pressure oscillation unit utilizes the residual pneumatic potential energy inside the positive and negative pressure integrated unit 2 to release energy, and the control module precisely adjusts the pressure waveform and duration. This component helps to thoroughly remove fine residual impurities accumulated in the gaps between the molecular sieve layers during the filtration process, avoiding recontamination caused by incomplete adsorption.

[0047] Specifically, the electromagnetically driven airflow control valve 14, in conjunction with the gas storage buffer chamber, can trigger brief but intense pressure pulsations when needed. This process can be synchronized and coordinated by a programmable controller, automatically activating the relevant components of the integrated pulse generator 58 at the end of the filtration stage to ensure the effectiveness and reliability of the gas purification process. During this period, the generator is positioned close to the gas exchange path, ensuring that the pressure pulsation signal can directly act on the molecular sieve packing area within the oxygen generation tower 3.

[0048] As shown in Figure 2, in one embodiment, the compressed air inlet pipe of a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit 2 is positioned near the inner edge of the oxygen generator tower 3. In this way, the incoming air can flow tangentially along the inner wall of the oxygen generator tower 3. During this flow, a specific conical guide vane 59 is installed to promote uniform airflow distribution within the oxygen generator tower. The design of the conical guide vane 59 helps to change the direction of the airflow and adjust its speed, allowing the airflow to be distributed more smoothly within the internal space of the oxygen generator tower. Furthermore, this design effectively reduces the possibility of eddy current formation, thereby avoiding energy loss due to turbulence.

[0049] Specifically, the compressed air inlet pipe can be tightly fitted to the inner wall of the oxygen generator tower 3, while ensuring that its outlet direction is tangent to the inner wall. The conical guide vane 59 is composed of a smooth curved surface and is fixed to a position near the inlet pipe by means of threads or clips. For example, during actual assembly, the distance between the guide vane and the inner wall can be adjusted through precision machining to optimize the gas inflow and ensure its stability under different pressures. This component combination simplifies the assembly process while meeting technical requirements.

[0050] As shown in Figure 2, in one embodiment, a dedicated connecting pipe for a single-tower VPSA oxygen generator employing a positive and negative pressure integrated unit 2 is installed between the positive and negative pressure integrated unit 2 and the oxygen generator tower 3, serving a crucial function in flow path communication. To ensure the pressure stability and operational continuity of the entire system, a pressure regulating valve 60 is added between the dedicated connecting pipe and the positive and negative pressure integrated unit 2. The pressure regulating valve 60 is fastened to the dedicated connecting pipe via a threaded connection or a compression fitting and is installed close to the positive and negative pressure integrated unit 2 to quickly respond to instantaneous pressure changes within the system. The pressure regulating valve 60 has an adjustable valve core assembly inside, which can effectively buffer pressure fluctuations during gas flow while ensuring that the pressure is maintained within a suitable range, thereby not affecting the normal operation of the positive and negative pressure integrated unit 2 and the oxygen generator tower 3.

[0051] For example, when the positive and negative pressure integrated machine 2 performs pressurization filling or vacuum extraction processes, changes in gas flow may cause the pressure in the dedicated connecting pipe to deviate from the set value for a short time. At this time, the pressure regulating valve 60 will dynamically adjust its opening to suppress large pressure fluctuations by balancing the internal and external gas flow. Specifically, the pressure regulating valve 60 adopts a spring-loaded structure with a sealing gasket, which can maintain reliable sealing performance and precise regulation capability under high-frequency operation switching.

[0052] Referring back to Figure 1, in one embodiment, the oxygen generating tower 3 of a single-tower VPSA oxygen generating device employing a positive and negative pressure integrated unit 2 of this application has an observation window 61 at a specific location on its side. This window is used to monitor the working status inside the tower in real time and promptly detect any obstructions. The observation window 61 is fitted with a maintenance panel made of pressure-resistant transparent material. This material can withstand the maximum pressure that the oxygen generating tower 3 may reach during operation while maintaining clear transparency for visual observation. This design ensures that operators can monitor the status of the packing material or the operation of the molecular sieve without stopping the machine, further ensuring the smooth operation of the device. The observation window 61 is located on the side of the oxygen generating tower 3 and near the middle, coinciding with the core oxygen generating area, thus more effectively reflecting the actual internal working conditions.

[0053] For example, a concave window structure can be pre-drilled at the corresponding position on the shell of the oxygen generator tower, and a pressure-resistant transparent panel can be installed there by bolting or welding. Specifically, to ensure airtightness and connection strength, the edges of the pressure-resistant transparent material can be pre-processed into a boss-type sealing ring structure, supplemented with high-pressure resistant gaskets and fasteners to ensure a secure installation. In addition, the pressure-resistant panel also features a reinforcing rib design, thus maintaining structural stability and optical performance even under high-pressure operating environments.

[0054] In actual operation, when this device is in use, the outside gas first undergoes preliminary purification through the filter media of filter 1. During this period, the rotating cleaning rod 11 can physically remove accumulated dust, and the filter layer is further flushed by the reverse airflow under positive pressure through the back-flushing gas channel 12 to enhance cleaning efficiency. The filtered gas enters the oxygen generating tower 3, where, under the operating conditions of pressure swing adsorption, the positive and negative pressure integrated machine 2 alternately applies vacuum extraction and pressurized filling, causing the molecular sieve to adsorb and separate impurity gases such as nitrogen to purify oxygen. After separation, the oxygen is discharged through the exhaust pipe 5. At this time, the gas outlet regulating valve 4 automatically adjusts its opening range according to the pressure state inside the oxygen generating tower, thereby ensuring that the purified oxygen reaches the required concentration and output pressure requirements.

[0055] 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.

[0056] 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 single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit, characterized in that, include: An oxygen generating tower (3) is used for loading packing material and pressure swing adsorption operation. A filter (1) is installed at the air inlet of the oxygen generating tower (3) to filter impurities in the gas entering the oxygen generating tower (3). The filter (1) is equipped with a rotatable cleaning rod (11) and a backflush gas channel (12) to use the reverse airflow generated under positive pressure to instantaneously flush the filter layer. The filter (1) is equipped with a filter material layer (52) to intercept particulate matter. The filter is located in the filter material layer. (52) A slag discharge pipe (13) is provided at the lowest end. The slag discharge pipe (13) is also provided with a control valve (14) to control the opening and closing of the slag discharge pipe; a positive and negative pressure integrated machine (2) is used to alternately apply vacuum extraction and pressurized filling; the positive and negative pressure integrated machine (2) is connected to the oxygen generating tower body (3) through a special connecting pipe; an exhaust pipe (5) is provided at the top of the oxygen generating tower body (3); a gas outlet regulating valve (4) is provided on the exhaust pipe (5) to regulate the output of purified oxygen and control the pressure.

2. The single-tower VPSA oxygen generator with integrated positive and negative pressure as described in claim 1, characterized in that: The filter (1) is inclined and connected to the outer wall of the oxygen tower body (3) through a support frame (51), so that larger particles will naturally slide off due to gravity when air enters.

3. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit as described in claim 1, characterized in that: The rotatable cleaning rod (11) is equipped with a cleaning brush (53) for removing sticky dust.

4. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit as described in claim 3, characterized in that: The rotatable cleaning rod (11) is connected to a stepper motor (54) for controlling the rotation speed and the timing of rotation and stop.

5. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit according to claim 1, characterized in that: One end of the backflush gas channel (12) is fixed with an airflow disk (55), and multiple sets of nozzles (56) are arrayed at the top of the airflow disk (55) to accelerate the impact force of the reverse jet flow.

6. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit according to claim 1, characterized in that: The gas passage (12) is also equipped with a solenoid valve (57) for controlling the opening and closing of the gas passage (12).

7. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit according to claim 1, characterized in that: The positive and negative pressure integrated machine (2) is equipped with an integrated pulse generator (58), which can trigger a brief but intense pressure pulse in the later stage of the filtration process.

8. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit according to claim 1, characterized in that: The special connecting pipe is provided with a conical guide (59) near the inner wall edge of the oxygen generating tower (3) so that air flows tangentially along the inner wall.

9. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit according to claim 1, characterized in that: A pressure regulating valve (60) is installed between the special connecting pipe and the positive and negative pressure integrated machine (2) to maintain the system pressure within a suitable range.

10. A single-tower VPSA oxygen generator employing an integrated positive and negative pressure unit according to claim 1, characterized in that: The oxygen generating tower body (3) has an observation window (61) on the side of the corresponding position, and is equipped with an inspection panel to facilitate the viewing of the internal condition.

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