A dehumidification method of a vehicle-mounted VPSA oxygen production system

Abstract

The present application relates to oxygen production technical field, particularly to a kind of vehicle-mounted VPSA oxygen production system's dehumidification method, including air intake filter, compressor, reversing valve, first molecular sieve tower and second molecular sieve tower, and relief valve is arranged between positive pressure output end and reversing valve;Negative pressure suction end is communicated with reversing valve by second pipeline;The reverse end of first molecular sieve tower and second molecular sieve tower is connected with third pipeline, and take gas valve and water removal device are arranged on third pipeline, and take gas valve is used to introduce sweep gas from cockpit.This application uses low humidity gas in cockpit after air intake filter and air conditioner processing as reverse sweep gas source, and combines the initiative suction power provided by compressor negative pressure suction end, realizes the collaborative deep dehumidification of low humidity gas reverse sweep and negative pressure forced suction and exhaust, compared with the atmospheric pressure passive sweep mode of prior art, can actively remove the combined water accumulated in molecular sieve micropore, improve the service life of molecular sieve in high humidity environment.

Description

Technical Field

[0001] This invention relates to the field of oxygen generation technology, and in particular to a dehumidification method for a vehicle-mounted VPSA oxygen generation system. Background Technology

[0002] Pressure swing adsorption (VPSA) oxygen generation technology has become the mainstream technology for small and medium-sized oxygen generation equipment due to its simple operation, relatively low energy consumption, and ability to separate oxygen and nitrogen at room temperature. Its core lies in utilizing the selective adsorption characteristics of molecular sieves for oxygen and nitrogen. When pressurized, nitrogen is adsorbed and oxygen is enriched. When depressurized, nitrogen is desorbed and the molecular sieve is regenerated. In this cycle, the adsorption capacity and separation efficiency of the molecular sieve directly determine the oxygen concentration, oxygen production, and long-term operational stability of the whole machine.

[0003] However, molecular sieve materials are extremely sensitive to moisture. Water molecules compete with nitrogen for active adsorption sites on the surface of the molecular sieve, causing the molecular sieve to "poison" and fail. This can result in reduced oxygen concentration or irreversible pulverization of the molecular sieve, significantly shortening the equipment's lifespan.

[0004] Patent application CN103130187A discloses a "nitrogen backwashing technology," which improves upon the traditional dual-tower VPSA oxygen generation structure. The specific technical route is as follows: Outdoor air is first pre-filtered by an activated alumina inlet filter, then pressurized by a compressor. The pressurized, high-temperature, high-humidity gas undergoes primary condensation and dehydration via a water-vapor separator, and is then sent to a backwashing gas supply reversing valve through the compressor's main oxygen supply pipeline. This reversing valve is controlled by a circuit board program and can cyclically switch the gas supply path between directions A and B. When the system supplies gas along direction A, the compressed air enters the corresponding molecular sieve tower for oxygen-nitrogen separation, and the oxygen-enriched gas is collected through a pipeline to an oxygen storage facility. The high-concentration nitrogen gas separated from the gas is discharged through a nitrogen purger. At the same time, the nitrogen gas flow is used to back purge the molecular sieve tower on the other side, carrying away the water vapor and impurity particles remaining in the molecular sieve and activated alumina layer from the previous oxygen production cycle. More importantly, the circuit board has a direction memory function, automatically switching the previous gas supply direction each time it is turned on (e.g., if it was direction A this time, it will automatically switch to direction B next time it is turned on), thereby achieving the effect of "alternating backflushing and bidirectional cleaning". In addition, this technology fills both ends of the molecular sieve tower with activated alumina layer and works with an air intake water vapor separator to reduce the impact of water vapor from both the air intake source and the adsorption inside the tower, in order to extend the service life of the molecular sieve.

[0005] However, in the aforementioned technologies, the air source is outdoor air. The relative humidity of outdoor air fluctuates greatly due to weather, season, and geographical environment. Especially in the rainy season, coastal areas, or high-humidity regions, the absolute moisture content of outdoor air is extremely high. Although the solution is equipped with an activated alumina inlet filter and a water vapor separator, both of these components are passive dehumidification elements with limited drying capacity. High humidity environments will quickly saturate the pre-activated alumina layer and cause it to fail. Once saturated, a large amount of insufficiently dried water vapor will directly flow into the molecular sieve tower, causing the internal activated alumina layer and molecular sieve bed to be in a high-humidity load state for a long time. This "pollute first, treat later" approach causes the activated alumina dehumidification layer inside the tower to quickly deplete its adsorption capacity, requiring frequent replacement and greatly increasing maintenance costs.

[0006] Secondly, although the above-mentioned technologies employ nitrogen backwashing and alternating direction start-up strategies, their nitrogen removal and regeneration processes essentially rely on pressure release at the end of the oxygen production cycle and atmospheric or slightly positive pressure purging. This purging method has a certain effect on removing residual water free on the surface of the molecular sieve, but for strongly bound water that has penetrated deep into the micropores of the molecular sieve and adsorbed through hydrogen bonds, simple airflow switching and ambient temperature purging alone cannot provide sufficient desorption driving force. Water vapor accumulates in the molecular sieve channels over a long period of time and gradually occupies effective adsorption sites, resulting in an irreversible decline in the adsorption capacity of the molecular sieve even with periodic backwashing, and the improvement in its service life is far from the theoretical expectation.

[0007] In summary, although the existing publicly available nitrogen backwashing technology has made some improvements in terms of structural control and alternating cleaning approach, it still fundamentally relies on the mode of "passive dehumidification of external air + simple end-point purging". It fails to solve the problem of performance degradation of molecular sieves caused by moisture accumulation in high humidity environments. Especially for oxygen generation equipment that operates outdoors, in vehicles, or in high humidity climates for a long time, there is still a lot of room for improvement in the actual service life of its molecular sieves.

[0008] Therefore, it is necessary to develop a dehumidification method for VPSA oxygen generation systems that can improve the actual service life of molecular sieves. Summary of the Invention

[0009] To address the aforementioned technical problems, the present invention aims to provide a dehumidification method for a vehicle-mounted VPSA oxygen generation system, thereby improving the actual service life of the molecular sieve.

[0010] The technical solution adopted by this invention to solve the problem is: a dehumidification method for an on-board VPSA oxygen generation system, wherein the oxygen generation system includes an intake filter, a compressor, a reversing valve, a first molecular sieve tower, and a second molecular sieve tower. Both the first and second molecular sieve towers have a positive end and a negative end. The compressor has a positive pressure output end and a negative pressure suction end. The positive pressure output end is connected to the reversing valve via a first pipeline, and a first branch is provided on the first pipeline, with a pressure relief valve on the first branch. The negative pressure suction end is connected to the reversing valve via a second pipeline. The negative ends of the first and second molecular sieve towers are connected to a third pipeline, which is equipped with an air intake valve and a water removal device. The air intake valve is used to introduce purge gas from the cockpit, and the water removal device is used to dry the introduced purge gas. The oxygen generation system includes a dehumidification mode, and the dehumidification steps of the dehumidification mode include: S1. When the preset dehumidification trigger condition is met, the oxygen generation system switches to dehumidification mode.

[0011] S2. The reversing valve is switched to a state that connects the negative pressure suction end with the molecular sieve tower to be dehumidified, and the pressure relief valve is opened to release the pressure at the positive pressure output end.

[0012] S4. Open the gas intake valve to introduce purge gas from the cockpit. After being dried by the dehumidification device, the purge gas flows into the reverse end of the molecular sieve tower to be dehumidified, and passes through the molecular sieve tower under the suction of the negative pressure suction end before being discharged outside the system.

[0013] As a further improvement to the above technical solution, the preset dehumidification trigger condition is that the humidity of the molecular sieve tower exceeds a set threshold or the cumulative operating time of the system reaches a set threshold.

[0014] As a further improvement to the above technical solution, a sensor is installed on the molecular sieve tower. The function of the sensor includes detecting the humidity of the molecular sieve tower, and the dehumidification trigger condition is that the humidity of the molecular sieve tower exceeds a set threshold.

[0015] As a further improvement to the above technical solution, the sensor is a temperature and humidity sensor, and the function of the sensor also includes detecting the temperature of the molecular sieve tower. The molecular sieve tower is equipped with a heating device, and the dehumidification step further includes: S3, the heating device raises the temperature of the molecular sieve tower to be dehumidified to 70-80℃.

[0016] As a further improvement to the above technical solution, a carbon dioxide filter device is also provided on the third pipeline, which is used to filter carbon dioxide in the purge gas.

[0017] As a further improvement to the above technical solution, the oxygen generation system includes an oxygen generation mode. The oxygen generation steps of the oxygen generation mode include: switching the reversing valve to allow the positive pressure output end of the compressor to alternately supply gas to the first molecular sieve tower and the second molecular sieve tower for pressurized adsorption oxygen generation; the other molecular sieve tower, which does not participate in oxygen generation, is regenerated by vacuum desorption through the negative pressure suction end of the compressor, and so on in a cycle.

[0018] As a further improvement to the above technical solution, the reverse ends of the first molecular sieve tower and the second molecular sieve tower are also connected to a fourth pipeline. The fourth pipeline is equipped with a pressure sensor, an oxygen storage tank, a flow sensor, a concentration sensor, a bacterial filter, and a throttling valve. The oxygen storage tank is equipped with a flow regulating valve. The reverse ends of the first molecular sieve tower and the second molecular sieve tower are provided with a first connecting pipeline and a second connecting pipeline that are interconnected. The first connecting pipeline is equipped with a backflush valve, and the second connecting pipeline is connected to the fourth pipeline.

[0019] As a further improvement to the above technical solution, a power supply and a control board are also included. The power supply is used to power the compressor and the control board, and the control board is used to communicate with the pressure relief valve, the reversing valve, the backflush valve, the pressure sensor, the flow sensor, the concentration sensor, and the flow regulating valve.

[0020] As a further improvement to the above technical solution, a one-way valve and a silencer are also provided on the second pipeline, and the outlet end of the second pipeline is a nitrogen discharge port.

[0021] The beneficial effects of this invention are as follows: This invention uses low-humidity gas processed by the air intake filter and air conditioning in the cockpit as the back purge gas source, and combines it with the active suction power provided by the negative pressure suction end of the compressor to achieve synergistic deep dehumidification of low-humidity gas back purge and negative pressure forced exhaust. Compared with the existing atmospheric pressure passive purge method, it can actively remove the bound water accumulated in the micropores of the molecular sieve, and significantly improve the activity recovery effect and service life of the molecular sieve in high humidity environment. Attached Figure Description

[0022] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a schematic diagram of the system structure of the dehumidification solution of the present invention; Figure 2 This is a schematic diagram of the system structure of the dehumidification and carbon dioxide solution of the present invention; In the diagram: 1-Intake air filter, 2-Compressor, 21-Positive pressure output end, 22-Negative pressure suction end, 3-Reversing valve, 41-First molecular sieve tower, 42-Second molecular sieve tower, 51-First pipeline, 511-First branch line, 5111-Pressure relief valve, 52-Second pipeline, 521-Check valve, 522-Silencer, 523-Nitrogen discharge port, 53-Third pipeline, 531-Gas intake valve, 532-Water removal device, 533-Carbon dioxide filter device, 54-Fourth pipeline, 541-Pressure sensor, 542-Oxygen storage tank, 543-Flow sensor, 544-Concentration sensor, 545-Bacterial filter, 546-Throttle valve, 55-First connecting pipeline, 551-Backflush valve, 56-Second connecting pipeline, 6-Power supply, 7-Control board. Detailed Implementation

[0024] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0025] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0026] Reference Figures 1 to 2 An in-vehicle VPSA oxygen generation system is disclosed. The system draws air from outside the driver's cabin as its oxygen source. The system includes an intake filter 1, a compressor 2, a reversing valve 3, a first molecular sieve tower 41, and a second molecular sieve tower 42. Outside air is filtered, dust-removed, and preliminarily dehumidified by the intake filter 1 before entering the compressor 2 for pressurization. The system utilizes the drying effect of the intake filter 1 and the air conditioning system to create a relatively low-humidity air source environment inside the driver's cabin, providing a dry purge air source for subsequent dehumidification modes. Both the first molecular sieve tower 41 and the second molecular sieve tower 42 have a forward end and a reverse end (see reference). Figure 1(The left side of the molecular sieve tower is the positive end, and the right side is the reverse end). The compressor 2 has a positive pressure output end 21 and a negative pressure suction end 22. The positive pressure output end 21 is used to pressurize the air to provide the adsorption pressure required for oxygen production. The negative pressure suction end 22 uses the negative pressure generated by the piston movement of the compressor 2 to perform vacuum desorption and regeneration of the molecular sieve tower. The positive pressure output end 21 is connected to the reversing valve 3 through a first pipeline 51. A first branch 511 is provided on the first pipeline 511, and a pressure relief valve 5111 is provided on the first branch 511. The pressure relief valve 5111 is opened in dehumidification mode to avoid excessive pressure at the air inlet during dehumidification. The negative pressure suction end 22 is connected to the reversing valve 3 through a second pipeline 52. The switching of the reversing valve 3... The positive pressure output end 21 can alternately supply gas to the first molecular sieve tower 41 or the second molecular sieve tower 42 to achieve alternating adsorption and oxygen production in the two towers. At the same time, the negative pressure suction end 22 can selectively connect with the molecular sieve tower that is not involved in oxygen production to perform vacuum desorption and regeneration, or connect with the molecular sieve tower to be dehumidified to perform reverse suction dehumidification operation. The reverse ends of the first molecular sieve tower 41 and the second molecular sieve tower 42 are connected to a third pipeline 53. The third pipeline 53 is equipped with a gas intake valve 531 and a water removal device 532. The gas intake valve 531 is used to introduce purge gas (i.e., cabin air with low humidity) from the cockpit. The water removal device 532 is used to perform deep drying treatment on the introduced purge gas. The oxygen production system includes an oxygen production mode and a dehumidification mode.

[0027] In some embodiments, the dehumidification device 532 is preferably an activated alumina dryer or a water vapor separator to ensure that the purge gas entering the molecular sieve tower has extremely low moisture content, thereby improving the dehumidification effect.

[0028] In some embodiments, the reversing valve 3 is a two-position four-way solenoid valve.

[0029] In a preferred embodiment, a temperature and humidity sensor is installed on the molecular sieve tower. The temperature and humidity sensor is used to detect the humidity and temperature of the molecular sieve tower. When the humidity of the molecular sieve tower is detected to be greater than a set threshold, it indicates that the molecular sieve has absorbed water to the point where intervention is required. The control board 7 automatically controls the oxygen generation system to start the dehumidification mode. This triggering method can accurately start the dehumidification program according to the actual water content of the molecular sieve, avoiding unnecessary energy consumption.

[0030] In other possible embodiments, the dehumidification mode can also be triggered when the cumulative system running time reaches a set threshold. When the oxygen generation system has accumulated a preset running time, the control board 7 automatically triggers the dehumidification mode to perform regular maintenance dehumidification on the molecular sieve tower.

[0031] In a preferred embodiment, a carbon dioxide filter 533 is also provided on the third pipeline 53. The carbon dioxide filter 533 is used to filter carbon dioxide in the purge gas. The carbon dioxide filter 533 is located between the gas intake valve 531 and the dehumidification device 532. The air in the cockpit contains carbon dioxide exhaled by the personnel. If it directly enters the molecular sieve tower, the carbon dioxide molecules will compete with nitrogen for the adsorption sites of the molecular sieve, affecting the adsorption performance of the molecular sieve. The carbon dioxide filter 533 effectively avoids this problem, ensuring that the purge gas does not introduce new pollution sources while being dehumidified.

[0032] In some embodiments, the reverse ends of the first molecular sieve tower 41 and the second molecular sieve tower 42 are further connected to a fourth pipeline 54. The fourth pipeline 54 is equipped with a pressure sensor 541, an oxygen storage tank 542, a flow sensor 543, a concentration sensor 544, a bacterial filter 545, and a throttling valve 546. The oxygen storage tank 542 is equipped with a flow regulating valve, and the outlet end of the fourth pipeline 54 is an oxygen outlet. The pressure sensor 541 monitors the internal pressure of the oxygen storage tank 542 to ensure that the oxygen storage pressure is within a safe range; the flow sensor 543 detects the flow rate of the output oxygen in real time; the concentration sensor 544 monitors whether the concentration of the output oxygen meets the standard; and the bacterial filter 545 filters… The oxygen-enriched gas is used to remove microorganisms; the throttle valve 546 is used to maintain a constant oxygen output flow rate; the oxygen storage tank 542 is equipped with a flow regulating valve, which allows the user to adjust the output flow rate as needed; the first molecular sieve tower 41 and the second molecular sieve tower 42 are connected to each other by a first connecting pipe 55 and a second connecting pipe 56 at their reverse ends. The first connecting pipe 55 is equipped with a backflush valve 551, and the second connecting pipe 56 is connected to the fourth pipe 54. Two one-way valves 521 are installed on the second connecting pipe 56, one of which is installed between the reverse end of the first molecular sieve tower 41 and the input end of the fourth pipe 54, and the other is installed between the reverse end of the second molecular sieve tower 42 and the input end of the fourth pipe 54.

[0033] In some embodiments, the system further includes a power supply 6 (preferably vehicle-mounted DC 12V) and a control board 7. The power supply 6 is used to supply power to the compressor 2 and the control board 7. The control board 7 is used to communicate with the pressure relief valve 5111, the reversing valve 3, the backflush valve 551, the pressure sensor 541, the flow sensor 543, the concentration sensor 544, and the flow regulating valve.

[0034] In some embodiments, the second pipeline 52 is further provided with a one-way valve 521 and a silencer 522. The outlet end of the second pipeline 52 is a nitrogen discharge port 523. The one-way valve 521 ensures that gas can only flow from the reversing valve 3 to the nitrogen discharge port 523, preventing backflow of external air. The silencer 522 is used to reduce the airflow noise generated by the rapid release of high-pressure gas during nitrogen discharge, improving the comfort of the vehicle environment. In oxygen generation mode, the second pipeline 52 is used to discharge the high-concentration nitrogen gas desorbed by the molecular sieve tower outside the vehicle; in dehumidification mode, the second pipeline 52 is used to discharge the humid waste gas extracted by the negative pressure suction end 22 outside the vehicle.

[0035] The oxygen generation system includes an oxygen generation mode and a dehumidification mode.

[0036] The oxygen generation mode operates as follows: By switching the reversing valve 3, the positive pressure output end 21 of the compressor 2 alternately supplies gas to the first molecular sieve tower 41 and the second molecular sieve tower 42. When the reversing valve 3 switches to the first molecular sieve tower 41 side, pressurized air enters the first molecular sieve tower 41 from the positive end, the pressure inside the first molecular sieve tower 41 increases, nitrogen is adsorbed by the molecular sieve, and oxygen-enriched gas enters the fourth pipeline 54 from the reverse end through the second connecting pipeline 56, and flows into the oxygen storage tank 542 through the one-way valve 521. At the same time, the second molecular sieve tower 42 is disconnected from the positive pressure end and connected to the negative pressure suction end 22. The nitrogen adsorbed by the molecular sieve is desorbed and released under the action of negative pressure, and discharged outside the vehicle through the nitrogen discharge port 523 of the second pipeline 52. After a predetermined time, the reversing valve 3 switches, the positive pressure end turns to supply gas to the second molecular sieve tower 42, and the first molecular sieve tower 41 turns to negative pressure desorption and regeneration. This cycle continues to generate oxygen-enriched gas.

[0037] The dehumidification mode operates as follows: S1. When the temperature and humidity sensor detects that the humidity inside the molecular sieve tower exceeds the set threshold, or when the system's cumulative running time reaches the set threshold, the dehumidification mode is triggered.

[0038] S2. The reversing valve 3 connects the negative pressure suction end 22 to the positive end of the first molecular sieve tower 41 or the second molecular sieve tower 42. At the same time, the control board 7 opens the pressure relief valve 5111 to directly release the pressurized gas generated by the positive pressure output end 21 of the compressor 2 to the atmosphere, so as to avoid the positive pressure gas interfering with the suction and dehumidification effect of the negative pressure suction end 22.

[0039] S3. Raise the temperature of the molecular sieve tower to be dehumidified to 70-80℃. In dehumidification mode, the temperature of the molecular sieve tower (first molecular sieve tower 41 or second molecular sieve tower 42) to be dehumidified is raised to 70-80℃. Specifically, the molecular sieve tower can be heated by setting a heating device outside the molecular sieve tower. The temperature increase can significantly reduce the adsorption binding energy of water molecules on the surface of the molecular sieve micropores, so that the bound water is converted from liquid to gaseous water vapor, which is more easily desorbed by negative pressure, greatly improving the dehumidification efficiency and depth.

[0040] S4. Open the air intake valve 531 to introduce low-humidity purge gas from the driver's cabin. The purge gas passes through the third pipeline 53 in sequence through the dehydration device 532 (deep drying) and the carbon dioxide filter device 533 (carbon dioxide removal). It then flows in from the reverse end of the molecular sieve tower to be dehumidified. Under the suction action of the negative pressure suction end 22, the purge gas passes through the molecular sieve bed in the opposite direction to the oxygen production mode, carrying away the water vapor desorbed from the surface of the molecular sieve and the micropores due to the temperature rise. The water-containing waste gas enters the second pipeline 52 through the reversing valve 3 and is discharged outside the vehicle after passing through the silencer 522.

[0041] S5. When the dehumidification time reaches the preset duration (e.g., 5-15 minutes) or the temperature and humidity sensor detects that the humidity of the molecular sieve tower has dropped below the safety threshold, the control board 7 closes the gas intake valve 531 and the heating device, closes the pressure relief valve 5111, and the reversing valve 3 switches back to the oxygen production mode, and the system resumes normal oxygen production.

[0042] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct or indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A dehumidification method for an on-board VPSA oxygen generation system, the oxygen generation system comprising an intake filter (1), a compressor (2), a reversing valve (3), a first molecular sieve tower (41) and a second molecular sieve tower (42), wherein the first molecular sieve tower (41) and the second molecular sieve tower (42) each have a positive end and a negative end, and the compressor (2) has a positive pressure output end (21) and a negative pressure suction end (22), characterized in that: The positive pressure output terminal (21) is connected to the reversing valve (3) through the first pipeline (51). The first pipeline (51) is provided with a first branch (511), and the first branch (511) is provided with a pressure relief valve (5111). The negative pressure suction end (22) is connected to the reversing valve (3) through the second pipeline (52); The first molecular sieve tower (41) and the second molecular sieve tower (42) are connected to a third pipeline (53) at their opposite ends. The third pipeline (53) is equipped with a gas intake valve (531) and a water removal device (532). The gas intake valve (531) is used to introduce purge gas from the cockpit, and the water removal device (532) is used to dry the introduced purge gas. The oxygen generation system includes a dehumidification mode, and the dehumidification steps of the dehumidification mode include: S1. When the preset dehumidification trigger condition is met, the oxygen generation system switches to dehumidification mode: S2, the reversing valve (3) switches to a state that connects the negative pressure suction end (22) with the molecular sieve tower to be dehumidified, and opens the pressure relief valve (5111) to release the pressure of the positive pressure output end (21); S4. Open the gas intake valve (531) to introduce purge gas from the cockpit. After being dried by the dehumidification device (532), the purge gas flows into the reverse end of the molecular sieve tower to be dehumidified and passes through the molecular sieve tower under the suction of the negative pressure suction end (22) before being discharged outside the system.

2. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 1, characterized in that: The preset dehumidification trigger condition is that the humidity of the molecular sieve tower exceeds the set threshold or the cumulative operating time of the system reaches the set threshold.

3. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 2, characterized in that: The molecular sieve tower is equipped with a sensor, the function of which includes detecting the humidity of the molecular sieve tower. The dehumidification trigger condition is that the humidity of the molecular sieve tower exceeds a set threshold.

4. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 3, characterized in that: The sensor is a temperature and humidity sensor, and the sensor also has the function of detecting the temperature of the molecular sieve tower, which is equipped with a heating device. The dehumidification step also includes: S3. The heating device raises the temperature of the molecular sieve tower to be dehumidified to 70-80℃.

5. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 1, characterized in that: The third pipeline (53) is also equipped with a carbon dioxide filter (533), which is used to filter carbon dioxide in the purge gas.

6. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 1, characterized in that: The oxygen generation system includes an oxygen generation mode. The oxygen generation steps of the oxygen generation mode include: by switching the reversing valve (3), the positive pressure output end (21) of the compressor (2) alternately supplies gas to the first molecular sieve tower (41) and the second molecular sieve tower (42) to perform pressurized adsorption oxygen generation. The other molecular sieve tower that does not participate in oxygen generation is vacuumed and desorbed for regeneration through the negative pressure suction end (22) of the compressor (2), and so on in a cycle.

7. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 1, characterized in that: The first molecular sieve tower (41) and the second molecular sieve tower (42) are connected to a fourth pipeline (54) at their opposite ends. The fourth pipeline (54) is equipped with a pressure sensor (541), an oxygen storage tank (542), a flow sensor (543), a concentration sensor (544), a bacterial filter (545), and a throttle valve (546). The oxygen storage tank (542) is equipped with a flow regulating valve. The first molecular sieve tower (41) and the second molecular sieve tower (42) are provided with a first connecting pipe (55) and a second connecting pipe (56) that are connected to each other at their opposite ends. A backflush valve (551) is provided on the first connecting pipe (55), and the second connecting pipe (56) is connected to the fourth pipe (54).

8. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 7, characterized in that: It also includes a power supply (6) and a control board (7), the power supply (6) being used to supply power to the compressor (2) and the control board (7), and the control board (7) being used to communicate with the pressure relief valve (5111), the reversing valve (3), the backflush valve (551), the pressure sensor (541), the flow sensor (543), the concentration sensor (544), and the flow regulating valve.

9. The dehumidification method of a vehicle-mounted VPSA oxygen generation system as described in claim 1, characterized in that: The second pipeline (52) is also equipped with a check valve (521) and a silencer (522), and the outlet end of the second pipeline (52) is a nitrogen discharge port (523).

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