An oxygen generator system

Abstract

This application provides an oxygen generator system, belonging to the field of oxygen generator technology. The oxygen generator system includes: a molecular sieve module, comprising an air inlet, a nitrogen outlet, and an oxygen outlet; a compressor for supplying compressed air to the molecular sieve module; a first valve group including a first one-way valve located at the air inlet and a second one-way valve located at the nitrogen outlet, the first one-way valve including a state that maintains the flow of air to the molecular sieve module and a closed state that blocks the flow, the second one-way valve including a state that maintains the flow of nitrogen discharge from the molecular sieve module and a closed state that blocks the flow; and an intelligent delayed shutdown module for controlling the oxygen generator system to reach a shutdown state after shutdown by a predetermined time to discharge residual moisture, wherein when the oxygen generator system reaches the shutdown state, the compressor is turned off and both the first and second one-way valves are closed. This application can solve the problems of external moisture being difficult to block and internal moisture residue existing in the prior art.

Description

Technical Field

[0001] This application belongs to the field of oxygen generator technology, and specifically relates to an oxygen generator system. Background Technology

[0002] An oxygen generator system is a device that produces oxygen using air separation technology, and the molecular sieve module is the core component of the system. The working principle of the molecular sieve module is through a high-pressure adsorption-low-pressure desorption cycle (working pressure 0.14-0.2 MPa, desorption pressure ≤0.05 MPa), utilizing its porous crystal structure (pore size 0.3-1.0 nm) to selectively adsorb nitrogen from the air, thereby achieving oxygen separation.

[0003] However, the strong hydrophilicity of molecular sieve modules limits their oxygen separation capacity. Since water molecules (approximately 0.28 nm) are typically smaller than the pore size of molecular sieves (0.3-1.0 nm), they preferentially occupy nitrogen adsorption sites in the porous crystal structure, leading to a decrease in nitrogen adsorption capacity. Experimental data shows that when the ambient humidity is greater than 60% RH, the nitrogen adsorption capacity of the molecular sieve module decreases by 15%-20% per adsorption cycle, and the separated oxygen concentration drops from 93% to below 88%. Furthermore, long-term water absorption can cause irreversible damage to the molecular sieve framework: water molecules and Na+ in the molecular sieve lattice... + and K + The combination of cations leads to swelling and collapse of the porous crystal structure, which in turn shortens the service life of the molecular sieve module from the designed 2000+ hours to less than 500 hours, becoming the primary cause of after-sales failures in small oxygen generators (accounting for more than 65%).

[0004] Current industry technologies for moisture protection of molecular sieve modules have significant limitations. The main moisture protection solutions for molecular sieve modules suffer from two core problems: (1) Poor pressure adaptability: The opening pressure needs to be ≥5kPa, while the pressure swing adsorption oxygen generator only has a pressure of 0.02-0.05MPa during the desorption stage, which easily leads to "not closing tightly" (leakage >0.5mL / min), and external moisture can still penetrate in; (2) Single function: It can only block in one direction and cannot solve the problem of the discharge of residual humid air in the adsorption tower after the equipment is shut down. The residual moisture will continue to damage the molecular sieve.

[0005] In summary, moisture infiltration and moisture residue leading to molecular sieve failure remain the core bottlenecks restricting the reliability of oxygen generators. Summary of the Invention

[0006] This application aims to provide an oxygen generator system that can solve the problems of poor pressure adaptability and limited functionality in the protection scheme of molecular sieve modules of existing oxygen generator systems, which are prone to moisture infiltration and moisture residue, leading to molecular sieve failure.

[0007] According to a first aspect of this application, this application provides an oxygen generator system, comprising: Molecular sieve module, which includes an air inlet end, a nitrogen outlet end, and an oxygen outlet end; The compressor is used to supply compressed air to the air inlet of the molecular sieve module; The first valve group includes a first one-way valve located at the air inlet end and a second one-way valve located at the nitrogen discharge end. The first one-way valve includes a state that maintains the external environment supplying air to the molecular sieve module and a state that blocks the external environment from communicating with the molecular sieve module. The second one-way valve includes a state that maintains the molecular sieve module discharging nitrogen to the external environment and a state that blocks the external environment from communicating with the molecular sieve module. The intelligent delayed shutdown module is used to control the entire oxygen generator system to reach the shutdown state after receiving a shutdown command, which is delayed by a predetermined time to discharge residual moisture in the molecular sieve module. When the oxygen generator system reaches the shutdown state, the compressor is turned off and the first one-way valve and the second one-way valve are both closed.

[0008] Preferably, in this oxygen generator system, the oxygen outlet end of the molecular sieve module is equipped with a first solenoid valve. The first solenoid valve is used to immediately enter the closed state when the oxygen generator system receives a shutdown command, so as to block the connection between the oxygen outlet end of the molecular sieve module and the external environment. Moreover, the control signal of the first solenoid valve is triggered synchronously with the shutdown command of the intelligent delayed shutdown module.

[0009] Preferably, in this oxygen generator system, the compressor is used to supply compressed air to the air inlet of the molecular sieve module, and the air inlet of the compressor is connected to the first one-way valve.

[0010] Preferably, in this oxygen generator system, the first check valve is a low-pressure spring-reset check valve. When the compressor's outlet pressure increases to a first predetermined pressure value, the first check valve is in the open state, allowing the compressed air output by the compressor to enter the molecular sieve module through the air inlet; and / or The second check valve is a micro-pressure spring reset check valve. When the nitrogen discharge pressure of the molecular sieve module reaches the second predetermined pressure value, the second check valve is in the conducting state so that the nitrogen in the molecular sieve module can be discharged to the external environment through the nitrogen discharge end.

[0011] Preferably, in this oxygen generator system, the molecular sieve module further includes: a first molecular sieve tower, a second molecular sieve tower, and a main control valve, wherein, When the oxygen generator system is in operation, the main control valve is used to switch the gas path between the first molecular sieve tower and the second molecular sieve tower at predetermined intervals to alternate between the adsorption and desorption phases of the first and second molecular sieve towers.

[0012] Preferably, the oxygen generator system further includes an oxygen storage tank connected to both the first molecular sieve tower and the second molecular sieve tower, wherein... The first molecular sieve tower is connected to the oxygen storage tank through the first oxygen delivery passage, and is also connected to the second molecular sieve tower through the first purging passage. The second molecular sieve tower is connected to the oxygen storage tank through the second oxygen delivery passage, and is also connected to the first molecular sieve tower through the second purging passage. The first purging passage and the second purging passage are selectively opened and closed so that: when the first molecular sieve tower supplies oxygen to the oxygen storage tank through the first oxygen supply passage, the oxygen storage tank can be controlled to supply or interrupt the purging gas flow to the second molecular sieve tower by opening or closing the first purging passage; and when the second molecular sieve tower supplies oxygen to the oxygen storage tank through the second oxygen supply passage, the oxygen storage tank can be controlled to supply or interrupt the purging gas flow to the first molecular sieve tower by opening or closing the second purging passage.

[0013] Preferably, in the oxygen generator system, the first purging passage is provided with a first control valve, which is used to control the opening and closing of the first purging passage, and / or, the second purging passage is provided with a second control valve, which is used to control the opening and closing of the second purging passage.

[0014] Preferably, in the oxygen generator system, the first purging passage and the second purging passage have an overlapping section, which constitutes a common passage for the first purging passage and the second purging passage; the first control valve and the second control valve are both constructed as second solenoid valves located in the overlapping section, and the second solenoid valves synchronously control the selective opening and closing of the first purging passage and the second purging passage.

[0015] Preferably, the oxygen generator system further includes a second valve assembly, wherein, The second valve assembly includes a third check valve and a fourth check valve, which are connected to a second solenoid valve. When the first molecular sieve column is in the adsorption stage, the purge gas flow in the first molecular sieve column passes sequentially through the third check valve, the second solenoid valve, and the fourth check valve before flowing into the second molecular sieve column; and / or The second valve group includes a fifth check valve and a sixth check valve. The fifth check valve and the sixth check valve are connected to a second solenoid valve. When the second molecular sieve tower is in the adsorption stage, the purge gas flow in the second molecular sieve tower passes through the fifth check valve, the second solenoid valve and the sixth check valve in sequence and flows into the first molecular sieve tower.

[0016] Preferably, in this oxygen generator system, oxygen from the oxygen storage tank flows sequentially through a second solenoid valve and a fourth check valve into the second molecular sieve tower; and / or The oxygen in the oxygen storage tank flows into the first molecular sieve tower after passing through the second solenoid valve and the sixth check valve in sequence.

[0017] Preferably, in this oxygen generator system, a pressure equalization valve is further provided between the first molecular sieve tower and the second molecular sieve tower; wherein, After the adsorption stage of the first molecular sieve tower is completed, the gas in the first molecular sieve tower flows into the second molecular sieve tower through the pressure equalization valve, and / or, after the adsorption stage of the second molecular sieve tower is completed, the gas in the second molecular sieve tower flows into the first molecular sieve tower through the pressure equalization valve.

[0018] The technical solution of this application has at least the following technical effects: The technical solution for the oxygen generator system provided in this application constructs a full life-cycle protection system for the molecular sieve module through a collaborative design of "hardware mechanical seal + software dehumidification control" using a compressor, a first valve group, and an intelligent delayed shutdown module. Specifically, when the oxygen generator system is in operation, the air pressurized by the compressor can overcome the elastic force to open the first one-way valve located at the air inlet end, thereby keeping the first one-way valve in a state that maintains the flow of air from the external environment to the molecular sieve module. At this time, the molecular sieve module adsorbs nitrogen, and the produced oxygen is discharged through the oxygen outlet end. The desorbed nitrogen and humid air can overcome the elastic force of the second one-way valve located at the nitrogen discharge end, keeping the second one-way valve in a state that maintains the flow of nitrogen discharge from the molecular sieve module to the external environment, thereby discharging nitrogen and humid air to the external environment and maintaining the continuous dehumidification of the molecular sieve module. When the oxygen generator system is about to shut down, in order to reduce the residual moisture in the molecular sieve module, the intelligent delayed shutdown module can control the entire oxygen generator system to delay the shutdown state from the working state for a predetermined time after receiving the shutdown command. During this time, the compressor and molecular sieve module will continue to work for a certain period of time. Multiple adsorption and desorption operations will be performed inside the molecular sieve module. Under the action of the compressor, high-concentration oxygen will be continuously backflushed to remove residual moisture, thereby maintaining a high oxygen concentration and a relatively dry state in the molecular sieve module.

[0019] When the oxygen generator system reaches the shutdown state, the compressor is turned off and both the first and second one-way valves are closed. At this time, since the compressor stops working, there is no longer compressed air at the air inlet of the molecular sieve module, and the internal air pressure is less than the spring force of the first one-way valve. Therefore, the first one-way valve is in a closed state that blocks the external environment from communicating with the molecular sieve module. Furthermore, the nitrogen pressure discharged from the molecular sieve module after shutdown is insufficient to open the second one-way valve at the nitrogen discharge end, so the second one-way valve is also in a closed state that blocks the external environment from communicating with the molecular sieve module. Therefore, the first valve group is completely closed, the molecular sieve module is isolated from the external environment, and it can prevent the external humid air from seeping in from the air inlet and nitrogen discharge ends. The molecular sieve module enters a "dry and sealed state".

[0020] In summary, the configuration of the first valve group (including the first and second check valves) and the intelligent delayed shutdown module forms a two-dimensional solution of "external moisture barrier + internal residual moisture removal," thereby constructing a protection system for the entire life cycle of the molecular sieve module. This achieves deep integration with the original gas path structure of the oxygen concentrator, forming an integrated "adsorption-separation-protection" architecture for the oxygen concentrator system, reducing moisture infiltration and residual moisture. Experimental verification shows that the bidirectional micro-pressure spring-reset check valve of this application improves the moisture barrier rate by 90%, and the triple sealing mechanism can achieve full sealing of the molecular sieve module in a high-humidity environment (90% RH). The 15-second delayed shutdown reduces the humidity inside the molecular sieve to below the safe threshold (40% RH). Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall machine structure of an oxygen generator system provided in an embodiment of this application; Figure 2 for Figure 1 A cross-sectional view of an oxygen generator system provided in the embodiment shown; Figure 3 for Figure 1 The illustrated embodiment provides a schematic diagram of the gas path structure of the first type of oxygen generator system. Figure 4 This is a comparison diagram of the gas path structure of the oxygen generator system according to the present application and the existing gas path structure; Figure 5 for Figure 4 The pressure-time comparison line graph of the gas path structure shown; Figure 6 This is a schematic diagram of the working process of an oxygen generator system provided in an embodiment of this application.

[0022] The relevant symbols are marked as follows: 1-Molecular sieve module, 101-Air inlet, 102-Nitrogen outlet, 103-Oxygen outlet, 104-First molecular sieve tower, 1041-First filter, 1042-First airflow distribution plate, 1043-First molecular sieve compression spring, 1044-A tower check valve, 105-Second molecular sieve tower, 1051-Second filter, 1052-Second airflow distribution plate, 1053-Second molecular sieve compression spring, 1054-B tower check valve, 106-Main control valve, 2-Compressor, 3-First valve group, 301-First check valve, 302-Second check valve, 4-First solenoid valve, 5-Oxygen storage tank, 6 7-First oxygen delivery passage, 8-Second oxygen delivery passage, 9-Second purging passage, 10-Second solenoid valve, 11-Second valve group, 1101-Third check valve, 1102-Fourth check valve, 1103-Fifth check valve, 1104-Sixth check valve, 12-Equalizing valve, 13-Oxygen filter, 14-Inlet filter sealing cover, 15-Inlet filter replacement cover, 16-Battery, 17-Pressure sensor, 18-Inlet filter, 19-Oxygen sensor, 20-Negative pressure sensor, 22-Axial flow fan, 23-Exhaust silencer, 24-Throttle valve, 25-Spring pressure relief valve. Detailed Implementation

[0023] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0025] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the first feature and the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0026] To address the issues of poor pressure adaptability and limited functionality in existing molecular sieve module moisture protection solutions, leading to moisture infiltration and residue, the technical solution provided in the following embodiments of this application, through the inclusion of a first valve group (including a first one-way valve and a second one-way valve located at the air inlet and nitrogen outlet ends of the molecular sieve module, respectively) and an intelligent delayed shutdown module, achieves a collaborative design of "hardware mechanical sealing + software dehumidification," constructing a full life-cycle protection system for the molecular sieve. This addresses the moisture infiltration and residue problems of existing technologies from two dimensions: "external moisture barrier + internal residual dehumidification." The technical solution of this application is deeply integrated with the existing gas path of the oxygen generator, forming an integrated "adsorption-separation-protection" architecture.

[0027] To achieve the above objectives, see [link to relevant documentation]. Figure 1 , Figure 1 This is a schematic diagram of the overall machine structure of an oxygen generator system provided in an embodiment of this application. Figure 1 As shown, the machine structure of this oxygen generator system includes: Molecular sieve module 1 is equipped with a first one-way valve 301 and an air intake filter assembly (such as air intake filter cotton, air intake filter sealing cover 14, and air intake filter replacement cover 15, etc.) at the air intake end. The first one-way valve 301 is used to control the air entering from the external environment, and the air intake filter assembly is used to filter out impurities in the air.

[0028] For details on the structural layout and gas path structure of the oxygen generator system, please refer to [link / reference]. Figure 2 and Figure 3 , Figure 2 for Figure 1 A cross-sectional view of the oxygen generator system provided in the embodiment shown; Figure 3 for Figure 1 The illustrated embodiment provides a schematic diagram of the gas path structure of an oxygen generator system. (Combined with...) Figure 2 and Figure 3 It can be seen that the oxygen generator system specifically includes: Molecular sieve module 1 includes an air inlet 101, a nitrogen outlet 102, and an oxygen outlet 103. Air from the external environment enters the molecular sieve module 1 through the air inlet 101, where nitrogen is adsorbed and oxygen is generated. The generated oxygen is discharged through the oxygen outlet 103, and the desorbed nitrogen is discharged through the nitrogen outlet 102.

[0029] Other examples Figure 2As shown, the molecular sieve module 1 also includes a first molecular sieve tower 104 and a second molecular sieve tower 105. The first molecular sieve tower 104 is fixed inside the oxygen generator housing by a first molecular sieve compression spring 1043, and the second molecular sieve tower 105 is fixed inside the oxygen generator housing by a second molecular sieve compression spring 1053. To buffer the airflow from the air inlet 101 into the molecular sieve towers and to make the airflow distribution more uniform, this embodiment also provides a first airflow distribution plate 1042 at the bottom of the first molecular sieve tower 104 and a second airflow distribution plate 1052 at the bottom of the second molecular sieve tower 105. Furthermore, to filter and trap impurities in the air, this embodiment incorporates a first filter element 1041 in the first molecular sieve tower 104 and a second filter element 1051 in the second molecular sieve tower 105. Simultaneously, to control oxygen outflow and ensure sealing, a one-way valve connected to the oxygen storage tank 5 is also provided at the oxygen outlet end of the molecular sieve tower. Figure 2 The A-tower check valve 1044 and the B-tower check valve 1054 are described below. The gas path structure of the A-tower check valve 1044 and the B-tower check valve 1054 is as follows. Figure 3 The embodiments shown are described in detail; specifically, the one-way valve of tower A corresponds to... Figure 3 The third check valve 1101 and the fourth check valve 1102 in the middle; the check valve 1054 of tower B corresponds to Figure 3 The fifth check valve 1103 and the sixth check valve 1104 are included. Additionally, in... Figure 2 The oxygen generator system shown has a built-in battery 16 at the bottom of its casing to power the entire system, including the compressor 2 and axial flow fan and other electronic components.

[0030] Other examples Figure 3 As shown, the oxygen generator system also includes: Compressor 2, which is used to supply compressed air to the air inlet 101 of the molecular sieve module.

[0031] The first valve group 3 includes a first one-way valve 301 located at the air inlet end 101 and a second one-way valve 302 located at the nitrogen discharge end 102. The first one-way valve 301 includes a conducting state that maintains the external environment supplying air to the molecular sieve module and a closed state that blocks the external environment from communicating with the molecular sieve module. The second one-way valve 302 includes a conducting state that maintains the molecular sieve module discharging nitrogen to the external environment and a closed state that blocks the external environment from communicating with the molecular sieve module 1. The technical solution provided in this application embodiment, by setting a first valve group 3 (including a first one-way valve 301 and a second one-way valve 302), can ensure the one-way flow and reverse blockage of the molecular sieve module 1, thereby maintaining the strict sealing of the molecular sieve module 1 and reducing the infiltration of moisture from the external environment. Specifically, ① One-way flow: When the oxygen generator system is running, the air pressurized by the compressor 2 can overcome the 1-2 kPa elastic force to open the first one-way valve 301 located at the air inlet end, and the nitrogen gas and humid air generated by desorption can overcome the 3-4 kPa elastic force to open the second one-way valve 302 at the nitrogen discharge end 102 and be discharged, maintaining the one-way flow of the gas path from the air inlet end 101 to the nitrogen discharge end 102 of the molecular sieve module 1; ② Reverse blockage: After the oxygen generator system stops, the springs in the two one-way valves reset and push the valve core to press the sealing gasket, forming a two-way gas path closed loop, preventing external humid air from seeping in from the air inlet / nitrogen discharge port, and avoiding irreversible impact damage to the molecular sieve skeleton structure inside the adsorption tower after water absorption.

[0032] Furthermore, this application embodiment achieves a dual-dimensional solution of "external air barrier + internal residual moisture removal" through hardware mechanical sealing of the first one-way valve 301 and the second one-way valve 302, and through software-based intelligent delayed shutdown module. Through the collaborative design of "hardware mechanical sealing + software moisture removal," a full life-cycle protection system for molecular sieves is constructed. Specifically: The intelligent delayed shutdown module is used to control the entire oxygen generator system to delay its operation for a predetermined time after receiving a shutdown command. During this time, the compressor 2 and molecular sieve module 1 will continue to operate for a period of time. Multiple adsorption and desorption processes will occur inside the molecular sieve module 1. Under the action of the compressor 2, the high-concentration oxygen in the oxygen storage tank will be continuously backflushed to remove residual moisture from the molecular sieve module 1 within the predetermined time, thereby maintaining a high oxygen concentration and a relatively dry state inside the molecular sieve module 1. When the oxygen generator system reaches the shutdown state, the compressor 2 will be immediately shut down, and both the first one-way valve 301 and the second one-way valve 302 will be closed. At this time, the air inlet 101, nitrogen outlet 102, and oxygen outlet 103 of the molecular sieve module 1 will be sealed to prevent the infiltration of humid air from the external environment.

[0033] As a preferred solution, the intelligent delayed shutdown module includes a 72MHz STM32 microprocessor, a built-in timer, and a signal output module. The microprocessor is electrically connected to the compressor, the first solenoid valve / second solenoid valve, and the main control valve through an I / O interface. The timer is used to set the predetermined time for delayed shutdown, for example, 13.5-18 seconds.

[0034] The oxygen generator system provided in this application embodiment includes adsorption + pressure equalization + desorption backflushing in a complete working cycle, such as... Figure 5As shown, the entire working cycle is controlled within 11.9 seconds; as a preferred option, the complete working cycle is preferably 4.5 seconds (2 seconds of adsorption + 0.5 seconds of pressure equalization + 2 seconds of desorption backflushing). This allows for 3-4 working cycles (13.5-18 seconds) to ensure that residual humid air inside the molecular sieve module is fully discharged. Experiments have verified that with a 15-second delay, the relative humidity inside the molecular sieve module drops from 75%-80%RH at shutdown to below 30%RH, which is lower than the safe humidity for molecular sieves (40%RH). This significantly reduces the aging process of the molecular sieve crystals and extends the service life of the molecular sieve.

[0035] In summary, the oxygen generator system provided in this application embodiment, through the compressor 2, the first valve group 3, and the intelligent delayed shutdown module, employs a collaborative design of "hardware mechanical seal + software dehumidification control" to construct a full life-cycle protection system for the molecular sieve module 1. Specifically, when the oxygen generator system is in operation, the air pressurized by the compressor 2 can overcome the elastic force to open the first one-way valve 301 located at the air inlet end 101, thereby keeping the first one-way valve 301 in a state that maintains the external environment supplying air to the molecular sieve module 1. Furthermore, the nitrogen and humid air generated by the desorption of the molecular sieve module 1 can overcome the elastic force of the second one-way valve 302 located at the nitrogen discharge end 102, thereby keeping the second one-way valve 302 in a state that maintains the molecular sieve module 1 discharging nitrogen to the external environment, thus discharging the nitrogen and humid air to the external environment and maintaining the continuous dehumidification of the molecular sieve module 1. When the oxygen generator system needs to be shut down, in order to reduce the residual moisture in the molecular sieve module 1, the intelligent delayed shutdown module can control the entire oxygen generator system to delay the shutdown state from the working state for a predetermined time after receiving the shutdown command. At this time, the compressor 2 and the molecular sieve module 1 will continue to work for a certain period of time. The molecular sieve module 1 will perform multiple adsorption and desorption operations. Under the action of the compressor 2, it will continuously backflush with high-concentration oxygen, thereby maintaining the molecular sieve module 1 with a high oxygen concentration and a relatively dry state. When the oxygen generator system reaches the shutdown state, the compressor 2 is turned off and both the first one-way valve 301 and the second one-way valve 302 are closed. At this time, the compressor 2 stops working, and there is no more compressed air at the air inlet 101 of the molecular sieve module 1. The internal air cannot open the first one-way valve 301, so the first one-way valve 301 is in a closed state that blocks the external environment from communicating with the molecular sieve module 1. Furthermore, after shutdown, the nitrogen pressure discharged from the molecular sieve module 1 is insufficient to open the second one-way valve 302, so the second one-way valve 302 is also in a closed state that blocks the external environment from communicating with the molecular sieve module 1. Therefore, the first valve group 3 is completely closed, and the molecular sieve module 1 is isolated from the external environment, preventing external humid air from seeping in from the air inlet 101 and the nitrogen outlet 102. Thus, the molecular sieve module 1 enters a "dry and sealed state".

[0036] In summary, through the configuration of the first valve group 3 (including the first one-way valve 301 and the second one-way valve 302) and the intelligent delayed shutdown module, a dual-dimensional solution of "external moisture barrier + internal residual moisture removal" can be achieved, constructing a protection system for the entire life cycle of molecular sieves, realizing deep integration with the original gas path structure of the oxygen generator, and forming an integrated architecture of "adsorption-separation-protection" for the oxygen generator system.

[0037] As a preferred embodiment, such as Figure 3 As shown, in this oxygen generator system, the oxygen outlet 103 of the molecular sieve module 1 is equipped with a first solenoid valve 4. The first solenoid valve 4 is used to enter a closed state when the oxygen generator system receives a shutdown command, so as to block the connection between the oxygen outlet 103 of the molecular sieve module 1 and the external environment. The first solenoid valve 4 can be a two-position normally closed solenoid valve.

[0038] In the technical solution provided in this application embodiment, when the oxygen generator system receives a shutdown command, the first solenoid valve 4 enters the closed state. For example, during the triggering phase, when the user presses the shutdown button, the microprocessor of the oxygen generator system immediately cuts off the first solenoid valve 4 upon receiving the shutdown command. The first solenoid valve 4 is de-energized and closes, thereby blocking the connection between the oxygen outlet 103 of the molecular sieve module 1 and the external environment, maintaining the airtightness of the molecular sieve module 1, and preventing humid air from the external environment from flowing back into the molecular sieve module 1 from the oxygen outlet 103.

[0039] Specifically, as a preferred embodiment, such as Figure 3 As shown, in this oxygen generator system, compressor 2 is used to provide compressed air to molecular sieve module 1, and the air inlet of compressor 2 is connected to the first one-way valve 301.

[0040] In the technical solution provided in this application embodiment, the air inlet of compressor 2 is connected to the aforementioned first one-way valve 301. When the oxygen generator system is powered on, compressor 2 starts, and air from the outside environment is filtered by air inlet filter 18. At this time, the compressed air is pressurized by compressor 2 to 0.08-0.2 MPa, which will overcome the valve core pressure of the first one-way valve 301 at the air inlet end 101 of the molecular sieve module, making the first one-way valve 301 in a conducting state. At this time, air from the outside environment can flow into the molecular sieve module 1, realizing one-way conduction of the gas path structure. When the oxygen generator system receives a shutdown command, compressor 2 stops operating, and the gas path pressure of molecular sieve module 1 drops sharply (it can be stabilized at 0.01-0.05 MPa). The spring of the first one-way valve 301 returns to its original position, and the valve core presses the sealing gasket. After the first one-way valve 301 enters the closed state, the molecular sieve module 1 is completely sealed, and humid air from the outside environment cannot flow into the molecular sieve module 1 from the air inlet end 101. Of course, the first one-way valve 301 can also be located at the outlet end of the compressor 2. However, by setting the first one-way valve 301 at the inlet of the compressor 2, the compressor 2 can open the first one-way valve 301 with a smaller pressure. Therefore, by setting the first one-way valve 301 at the compressor inlet, it is easier to open the first one-way valve 301 when the compressor 2 starts, ensuring that air is quickly and smoothly drawn into the compressor 2.

[0041] In addition, as a preferred embodiment, in this oxygen generator system, the first one-way valve 301 is a micro-pressure spring-reset one-way valve. When the outlet pressure of the compressor 2 increases to a first predetermined pressure value, the first one-way valve 301 is in the open state, so that the compressed air output by the compressor 2 enters the molecular sieve module 1; and / or The second one-way valve 302 is a micro-pressure spring reset one-way valve. When the nitrogen discharge pressure of the molecular sieve module 1 reaches the second predetermined pressure value, the second one-way valve 302 is in the conducting state so that the nitrogen in the molecular sieve module 1 is discharged to the external environment through the nitrogen discharge end 102.

[0042] The micro-pressure spring-reset one-way valve includes a valve body, a valve core sealing gasket, and a reset spring. The valve body is made of modified ABS engineering plastic with 15% glass fiber added, which can adapt to the high-temperature heat dissipation environment of oxygen generators. The valve core sealing gasket is made of nitrile rubber, and the sealing surface adopts a double sealing structure of "cone + annular groove". The valve core stroke is 0.8mm. The reset spring is made of galvanized 65Mn spring steel wire with a stiffness of 0.5N / mm. The spring force threshold is adapted to 1-2kPa at the air inlet end and 3-4kPa at the nitrogen discharge end.

[0043] In the technical solution provided in this application embodiment, the first one-way valve 301 is a micro-pressure spring-reset one-way valve. The first predetermined pressure value set by the micro-pressure spring-reset one-way valve at the air inlet end 101 is 1-2 kPa. When the oxygen generator system is running, the compressor 2 starts. At this time, the pressurized compressed air can overcome the 1-2 kPa valve core pressure of the first one-way valve 301, so that the first one-way valve 301 is in the conducting state, thereby allowing the compressed air output by the compressor 2 to enter the molecular sieve module 1. The second one-way valve 302 is set at the nitrogen discharge end 102, and its corresponding second predetermined pressure value is 3-4 kPa. The second one-way valve 302 is set as a micro-pressure spring-reset one-way valve. The nitrogen and humid air generated by the desorption of the molecular sieve module 1 can overcome the 3-4 kPa valve core pressure of the second one-way valve 302, so that the second one-way valve 302 is in the conducting state, thereby enabling the entire molecular sieve module 1 to achieve unidirectional flow from the air inlet end 101 to the nitrogen discharge end 102. Of course, the aforementioned check valve can also be a diaphragm-type check valve. The structural differences between a diaphragm-type check valve and a micro-pressure spring-reset check valve are as follows: a silicone diaphragm (0.5mm thick) replaces the spring, achieving unidirectional flow through diaphragm deformation, eliminating the need for a metal spring component. Diaphragm-type check valves suffer from poor elastic stability and short lifespan, making them unsuitable for the long-term stable operation of oxygen concentrators.

[0044] Among them, such as Figure 3 As shown, in a preferred embodiment, in this oxygen generator system, the molecular sieve module, in addition to the air inlet 101, nitrogen outlet 102, and oxygen outlet 103 mentioned above, also includes: a first molecular sieve tower 104 (i.e., Figure 3 The adsorption tower A), the second molecular sieve tower 105 (i.e. Figure 3 The adsorption tower B) and the main control valve 106, wherein, When the oxygen generator system is in operation, the main control valve 106 is used to switch the gas path between the first molecular sieve tower 104 and the second molecular sieve tower 105 at predetermined intervals to alternate between the adsorption and desorption phases of the first molecular sieve tower 104 and the second molecular sieve tower 105 in order to stably produce high concentrations of oxygen.

[0045] Specifically, such as Figure 3 As shown, after the equipment is powered on, the microprocessor first starts the axial flow fan 22 to run for 3 seconds (for pre-heating), and then starts the compressor 2. After the air is filtered by the air intake filter 18, it enters the compressor 2 and is pressurized to 0.08-0.2MPa. The pressure of the compressed air overcomes the 1-2kPa elastic force of the first one-way valve 301 at the air intake end 101, and the outside air enters the molecular sieve module.

[0046] Then, the main control valve 106 switches the gas path under the control of the microprocessor, specifically as follows: Figure 3 As shown: First molecular sieve tower 104 (adsorption tower A): Under high pressure (0.08-0.2MPa), the first solenoid valve 4 (this solenoid valve is a two-position two-way solenoid valve) is energized and open. The molecular sieve adsorbs nitrogen and produces oxygen, which is filtered by oxygen filter 13 and then transported to oxygen outlet 103. Second molecular sieve tower 105 (adsorption tower B): under low pressure (0.01-0.05MPa), the molecular sieve desorbs nitrogen and humid air. The mixed gas overcomes the 3-4kPa elastic force of the second one-way valve 302 at the nitrogen discharge end 102 and is discharged after noise reduction by the exhaust silencer 23. Preferably, the main control valve 106 switches after 4.5 seconds, allowing the two adsorption towers to alternately complete adsorption and desorption, continuously producing qualified oxygen. During this process, the oxygen sensor 19 provides real-time data feedback to ensure stable system operation. The main control valve 106 switches the gas path every 4.5 seconds (2 seconds of adsorption + 0.5 seconds of pressure equalization + 2 seconds of desorption backflushing). This timing is optimized and determined based on the adsorption / desorption characteristics of the molecular sieve and the working pressure of the oxygen generator.

[0047] The main control valve 106 and the two molecular sieve tower structures of the aforementioned molecular sieve module also provide hardware support for the intelligent delayed shutdown module provided in the above embodiments of this application to achieve shutdown protection of the oxygen generator system. Based on the structure of the aforementioned molecular sieve module, the innovative control logic of the intelligent delayed shutdown module for the shutdown protection phase of the oxygen generator system in this embodiment is as follows: Upon detecting that the user has pressed the power off button, the oxygen concentrator system does not immediately cut off power, but instead initiates a "three-step protection process," as follows: a. Prioritize closing the first solenoid valve 4 at the oxygen outlet 103 (response time 8-10ms) to prevent moisture from flowing back from the oxygen outlet 103 into the molecular sieve module; b. Keep compressor 2, main control valve 106 and axial flow fan 22 running for 15 seconds. Main control valve 106 continues to switch the gas path of the two molecular sieve towers to ensure that the two molecular sieve towers complete several adsorption and desorption cycles while being backflushed with high-concentration oxygen (oxygen from oxygen storage tank 5 can be used). Since the separated oxygen is dry and the relative humidity is around 7%RH, high-concentration oxygen is used for backflushing. Finally, both towers maintain a high oxygen concentration and a relatively dry state. Axial flow fan 22 continues to dissipate heat to prevent compressor 2 from being overloaded for a short time. c. After 15 seconds, the microprocessor triggers a total power outage. At this time, the high-pressure tower and the low-pressure tower are connected. The pressure flows from the high-pressure tower to the low-pressure tower and the nitrogen discharge end 102 until the pressure of the two towers is balanced. Then, the gas is discharged synchronously to the nitrogen discharge end 102. Finally, the pressure is close to equal to the external pressure. At this time, the springs of the first one-way valve 301 and the second one-way valve 302 reset and seal, and the adsorption tower is isolated from the external environment and enters the "dry and sealed state".

[0048] In summary, under the control of the main control valve 106, the first molecular sieve tower 104 and the second molecular sieve tower 105 can alternately switch gas paths to alternately perform the adsorption and desorption stages, thus ensuring the normal operation of the molecular sieve module 1. Furthermore, during the shutdown protection phase of the intelligent delayed shutdown module, the main control valve 106 continues to switch gas paths according to the set cycle. The first molecular sieve tower 104 transitions from the adsorption stage to the desorption stage, discharging residual humid air. The second molecular sieve tower 105 (from its original desorption state) briefly adsorbs and then desorbs again, ensuring no residual moisture remains inside the tower. This method efficiently removes residual moisture from the interior of the molecular sieve module 1.

[0049] like Figure 3 As shown, in a preferred embodiment, the oxygen generator system further includes an oxygen storage tank 5 connected to the first molecular sieve tower 104 and the second molecular sieve tower 105, respectively. The first molecular sieve tower 104 is connected to the oxygen storage tank 5 through the first oxygen supply passage 6, and is also connected to the first purging passage 7 ( Figure 3 The solid arrow in the image is connected to the second molecular sieve tower 105; The second molecular sieve tower 105 is connected to the oxygen storage tank 5 through the second oxygen supply passage 8, and is also connected to the second purging passage 9 ( Figure 3 The dashed arrow portion in the diagram is connected to the first molecular sieve tower 104; The first purge passage 7 and the second purge passage 9 are selectively opened and closed so that: when the first molecular sieve tower 104 supplies oxygen to the oxygen storage tank 5 through the first oxygen supply passage 6, the purge gas flow is provided to or interrupted to the second molecular sieve tower 105 by opening or closing the first purge passage 7; and when the second molecular sieve tower 105 supplies oxygen to the oxygen storage tank 5 through the second oxygen supply passage 8, the purge gas flow is provided to or interrupted to the first molecular sieve tower 104 by opening or closing the second purge passage 9.

[0050] In the technical solution provided in this application embodiment, the first molecular sieve tower 104 is connected to the oxygen storage tank 5 through the first oxygen supply passage 6 and to the second molecular sieve tower 105 through the first purge passage 7. Thus, when the first molecular sieve tower 104 can supply oxygen to the oxygen storage tank 5 through the first oxygen supply passage 6, and by opening and closing the first purge passage 7, the high-concentration oxygen output from the first molecular sieve tower 104 and the high-concentration oxygen in the oxygen storage tank 5 can provide or interrupt the purge flow to the second molecular sieve tower 105, thereby promoting desorption in the second molecular sieve tower 105 and controlling oxygen storage. The same applies to the second molecular sieve tower 105. In summary, the oxygen storage tank 5 not only stores oxygen but also, under the control of the intelligent delayed shutdown module, allows for high-concentration oxygen backflushing of the second molecular sieve tower 105 through the first purge passage 7; or high-concentration oxygen backflushing of the first molecular sieve tower 104 through the second purge passage 9. Furthermore, through the selective opening and closing of the aforementioned gas path structure, alternating adsorption and desorption of the first molecular sieve tower 104 and the second molecular sieve tower 105 can be achieved. During the shutdown protection phase of the oxygen generator system, when the gas pressure in the oxygen storage tank 5 is higher than the pressure in the first molecular sieve tower 104 or the second molecular sieve tower 105, the residual humid air in the molecular sieve module 1 can be discharged through backflushing with high-concentration oxygen from the oxygen storage tank 5, ensuring that no moisture remains in the two molecular sieve towers.

[0051] In addition, by Figure 3As can be seen from the gas path structure shown, the oxygen generator system provided in this application embodiment is deeply integrated with the original gas path structure of the oxygen generator, forming an integrated "adsorption-separation-protection" architecture. In addition to the above-mentioned structural modules, the oxygen generator system also includes auxiliary modules, such as: air intake filter 18, oxygen sensor 19 (for monitoring oxygen concentration), negative pressure sensor 20 (for monitoring breathing pressure), microprocessor (MCU / STM32) and axial flow fan 22 (for heat dissipation), exhaust silencer 23, throttle valve 24 and spring pressure relief valve 25, etc. The intake filter 18 can be made of polyester needle-punched felt with a precision of 1-100µm, which can filter dust and organic impurities, avoid contaminating the molecular sieve, and reduce wear on the one-way valve core; the compressor can be a 2YUWELL1021 reciprocating oil-free piston compressor, which can provide the pressure basis for the one-way valve to open and continuously provide desorption power during the delayed shutdown period; the first solenoid valve 4 and the second solenoid valve 10 can be 1-2W, two-position, two-way solenoid valves with a voltage of about 12VDC, which can provide the pressure basis for the one-way valve to open and continuously provide desorption power during the delayed shutdown period; oxygen sensor; The 19-meter measuring range is 21%-96% O2 with an accuracy of ±1.5%, enabling real-time monitoring of oxygen concentration. If the concentration drops below 82% due to humidity, an alarm is triggered, reminding the user to check the one-way valve's sealing status. The 20-meter negative pressure sensor has a measuring range of ±500Pa and an accuracy of ±0.2%FS, used to monitor the breathing trigger pressure and ensure normal triggering function. The microprocessor has a main frequency of 72MHz and a built-in timer and interrupt controller, enabling precise control of the delayed shutdown time and the opening and closing of the two-position two-way solenoid valve. It also stores equipment operating data (cumulative running time, number of humidity alarms) for easy after-sales maintenance.

[0052] Additionally, refer to Figure 4 In the existing gas path structure, the passage between the first molecular sieve tower 104 and the second molecular sieve tower 105 is simply equipped with a throttle valve 24, and this throttle valve 24 is always open. Thus, when the main control valve 106 is open and the first one-way valve 301 is activated, the compressed air output from the compressor 2 will directly rush into the first molecular sieve tower 104 and then flow out through the passage below the first molecular sieve tower 104. This results in low adsorption efficiency and uneven gas distribution in the first molecular sieve tower 104, leading to insufficient pressure in the first molecular sieve tower 104. Figure 5 You can tell from the darker lines.

[0053] To address this problem, as a preferred embodiment, such as Figure 3 As shown, in the oxygen generator system, the first purging passage 7 is provided with a first control valve, which is used to control the opening and closing of the first purging passage 7, and / or, the second purging passage 9 is provided with a second control valve, which is used to control the opening and closing of the second purging passage 9.

[0054] Among them, such as Figure 3As shown, in this oxygen generator system, the first purging passage 7 and the second purging passage 9 have an overlapping section, which constitutes a common passage for the first purging passage 7 and the second purging passage 9; the first control valve and the second control valve are both constructed as second solenoid valves 10 located in the overlapping section, and the second solenoid valves 10 synchronously control the selective opening and closing of the first purging passage 7 and the second purging passage 9.

[0055] In the technical solution provided in this application embodiment, the alternating adsorption and desorption of the two molecular sieve towers in the molecular sieve module 1 can be achieved through the cooperation of the first control valve and the second control valve, ensuring the normal operation of the molecular sieve module 1 and ensuring that no moisture remains in the molecular sieve towers. By using the first and second control valves in this way, the passage between the two adsorption towers can be blocked during the inflow of compressed air, thereby ensuring that the compressed air flowing into the adsorption towers is evenly distributed, enhancing the adsorption pressure of the adsorption towers, and improving the adsorption efficiency. Figure 5 As shown, the pressure rises to approximately 300 kPa during the adsorption stage of column A alone. For ease of control, this embodiment of the application incorporates a portion of the overlapping section between the first purge passage 7 and the second purge passage 9, forming a shared passage for both. This combines the first and second control valves, resulting in a second solenoid valve 10 located in the overlapping section. By synchronously controlling the selective opening and closing of the first and second purge passages 7 and 9 through the second solenoid valve 10, the gas path can be flexibly switched, alternating the adsorption and desorption processes of the first molecular sieve column 104 and the second molecular sieve column 105.

[0056] As a preferred embodiment, such as Figure 3 As shown, the oxygen generator system also includes a second valve assembly 11, wherein, The second valve group 11 includes a third check valve 1101 and a fourth check valve 1102. The third check valve 1101 and the fourth check valve 1102 are connected to a second solenoid valve 10. When the first molecular sieve column 104 is in the adsorption stage, the purge gas flow in the first molecular sieve column 104 sequentially passes through the third check valve 1101, the second solenoid valve 10, and the fourth check valve 1102, and flows into the second molecular sieve column 105; and / or The second valve group 11 includes a fifth one-way valve 1103 and a sixth one-way valve 1104. The fifth one-way valve 1103 and the sixth one-way valve 1104 are connected to the second solenoid valve 10. When the second molecular sieve tower 105 is in the adsorption stage, the purge gas flow in the second molecular sieve tower 105 passes through the fifth one-way valve 1103, the second solenoid valve 10 and the sixth one-way valve 1104 in sequence and flows into the first molecular sieve tower 104.

[0057] In the technical solution provided in this application embodiment, the opening and closing of the node can be controlled by setting the second valve group 11, specifically in the adsorption stage of the first molecular sieve tower 104 (see...). Figure 5 During the 0-5 second phase, the second solenoid valve 10 closes, and purging does not occur. The pressure inside the first molecular sieve tower 104 increases, allowing for more complete adsorption by the molecular sieve, and ensuring sufficient adsorption of the adsorbent on the inner periphery of the molecular sieve tower. During the backflushing phase of the second molecular sieve tower 105 (see...),... Figure 5 The process involves purging during the 5-5.9 second phase, followed by the equalization phase (see [link]). Figure 5 During the 5.9-6 second phase, the second molecular sieve tower 105 can be prevented from being pulverized by a sudden impact of high-pressure gas flow.

[0058] Specifically, such as Figure 4 As shown, in a preferred embodiment, in this oxygen generator system, oxygen in the oxygen storage tank 5 flows sequentially through the second solenoid valve 10 and the fourth one-way valve 1102 into the second molecular sieve tower 105; and / or The oxygen in the oxygen storage tank 5 flows into the first molecular sieve tower 104 after passing through the second solenoid valve 10 and the sixth one-way valve 1104.

[0059] In the technical solution provided in this application embodiment, oxygen from the oxygen storage tank 5 flows sequentially through the second solenoid valve 10 and the fourth one-way valve 1102 into the second molecular sieve tower 105. The high-concentration oxygen from the oxygen storage tank 5 backflushes the second molecular sieve tower 105, maintaining a high oxygen concentration and a relatively dry state. The high-concentration oxygen from the oxygen storage tank 5 then flows sequentially through the second solenoid valve 10 and the sixth one-way valve 1104 into the first molecular sieve tower 104, thoroughly flushing the first molecular sieve tower 104 and maintaining a high oxygen concentration and a relatively dry state. Through this method, the high-concentration oxygen from the oxygen storage tank 5 can backflush the two molecular sieve towers in the molecular sieve module 1 during the delayed dehumidification stage, maintaining a relatively dry state for both towers and achieving efficient dehumidification of the molecular sieve module.

[0060] Other examples Figure 3 and Figure 4 As shown in the diagram, in a preferred embodiment, a pressure equalization valve 12 is further provided between the first molecular sieve tower 104 and the second molecular sieve tower 105 in the oxygen generator system; wherein, After the adsorption stage of the first molecular sieve tower 104 is completed, the gas in the first molecular sieve tower 104 flows into the second molecular sieve tower 105 through the pressure equalization valve 12, and / or, after the adsorption stage of the second molecular sieve tower 105 is completed, the gas in the second molecular sieve tower 105 flows into the first molecular sieve tower 104 through the pressure equalization valve 12.

[0061] In the technical solution provided in this application embodiment, a pressure equalization valve 12 is provided between the first molecular sieve tower 104 and the second molecular sieve tower 105. After the adsorption stage of the first molecular sieve tower 104 is completed, the gas in the first molecular sieve tower 104 flows into the second molecular sieve tower 105 through the pressure equalization valve 12. Similarly, after the adsorption stage of the second molecular sieve tower 105 is completed, the gas in the second molecular sieve tower 105 flows into the first molecular sieve tower 104 through the pressure equalization valve 12, thereby achieving pressure equalization between the two molecular sieve towers. The pressure equalization design of the pressure equalization valve can avoid pressure shocks during the switching of the two towers, prevent molecular sieve pulverization, and, in conjunction with the dehumidification function of delayed shutdown, further improve the service life of the molecular sieve.

[0062] In detail Figures 3-4 The diagram showing a comparison between the gas path structure of the oxygen generator system of this application and existing gas path structures is as follows: Figure 5 The pressure-time comparison line graph of the gas path structure shown can be used to list the detailed workflow of the oxygen generator system of this application embodiment, including: Phase 1 ( Figure 5 During the 0-5 second phase, the main control valve 106 switches to side B, and compressed air directly enters the first molecular sieve tower (adsorption tower A) 104. At the same time, the first molecular sieve tower 104 is pressurized and in an adsorption state. At this time, the second solenoid valve 10 is closed for a duration of T1 (approximately 5 seconds). In the second stage, the second solenoid valve 10 switches to the left position (when it is on), and in conjunction with the conduction direction of the third one-way valve 1101, the fourth one-way valve 1102, the fifth one-way valve 1103, and the sixth one-way valve 1104, the second molecular sieve tower (adsorption tower B) 105 enters the regeneration backflushing state for a duration of T2 (5-5.9 seconds). At this time, the first molecular sieve tower 104 pressurizes slowly, the second molecular sieve tower 105 backflushes, and oxygen flows to the oxygen storage tank 5, the second molecular sieve tower 105, and the oxygen outlet 103. In the latter half of this stage, the first molecular sieve tower 104 pressurizes the slowest, the second molecular sieve tower 105 backflushes / slowly pressurizes, and oxygen flows to the oxygen storage tank 5, the second molecular sieve tower 105, and the oxygen outlet 103.

[0063] In the third stage, before the regeneration of the second molecular sieve tower 105 ends, the equalizing valve 12 and the second solenoid valve 10 are opened for a period of time T3 (5.9-6 seconds) to quickly equalize the pressure between the first molecular sieve tower 104 and the second molecular sieve tower 105; at this time, the main control valve 106 is still on the B side, the first molecular sieve tower 104 desorbs and discharges nitrogen, and oxygen hardly flows.

[0064] In the fourth stage, the main control valve 106 switches to position A, and compressed air directly enters the second molecular sieve tower 105. At the same time, the second molecular sieve tower 105 is pressurized and in an adsorption state for a duration of T1 (in the 6th-11th second stage). In the fifth stage, the second solenoid valve 10 switches to the left position (when it is on), and in conjunction with the conduction direction of the third check valve 1101, the fourth check valve 1102, the fifth check valve 1103 and the sixth check valve 1104, the first molecular sieve tower 105 enters the regeneration backflushing state for a duration of T2. In the sixth stage, before the regeneration of the first molecular sieve column 104 is completed, the two two-position two-way solenoid valves, the equalizing valve 12 and the second solenoid valve 10, are opened for a period of time T3. Figure 5 During the 11th to 11.9th second phase, the pressure in the first molecular sieve tower 104 and the second molecular sieve tower 105 is rapidly averaged. During each of the above stages, the third check valve 1101, the fourth check valve 1102, the fifth check valve 1103, and the sixth check valve 1104 prevent backflow of airflow throughout the process, ensuring stable pressure in the adsorption tower and smooth discharge of regenerated airflow.

[0065] The above steps constitute one work cycle, and the oxygen generator system operates cyclically.

[0066] The advantage of this design is that: 1. The bidirectional symmetrical one-way valve + two-position valve structure makes the switching between the two towers smoother, avoids damage to the tower body and packing caused by pressure shock, and extends the service life of the oxygen generator equipment. 2. The one-way conduction characteristic of the check valve eliminates the risk of cross-flow without the need for additional complex control, simplifying the control logic and significantly improving system reliability; 3. The integrated valve assembly design makes the airflow path more compact, which reduces pipeline resistance and leakage risks, and also facilitates later maintenance and troubleshooting; 4. This structure supports seamless switching between adsorption and regeneration, ensuring process continuity and effectively improving overall processing efficiency.

[0067] Finally, by Figure 6 As shown in the flowchart, the oxygen generator system of the above embodiments of this application mainly includes a normal operation stage and a shutdown protection stage; based on the structural diagram of the above oxygen generator system, the workflow and working principle in the shutdown stage are as follows: S110: The user presses the power off button.

[0068] S120: The microprocessor receives the shutdown command.

[0069] S130: Cut off the power supply to the first solenoid valve 4 → close the oxygen outlet 103 passage.

[0070] S140: Start a 15s timer to keep compressor 2 / main control valve 106 / axial fan 22 running.

[0071] S150: Continuous desorption and moisture removal.

[0072] S160: Has the 15-second countdown ended? If yes, proceed to step S170; otherwise, return to step S150.

[0073] S170: Microprocessor-triggered total power failure.

[0074] S180: Compressor 2 / Main control valve 106 / Axial flow fan 22 closed.

[0075] S190: The springs of the first check valve 301 and the second check valve 302 are reset → the first molecular sieve tower 104 and the second molecular sieve tower 105 are sealed.

[0076] S1100: The equipment is shut down, and the molecular sieve is in a drying protection state.

[0077] Combination Figure 3 The working principle of the oxygen generator system, as shown in the structural diagram, is as follows: I. Normal Operation Phase (Protection System Working Together): 1. After the equipment is powered on, the microprocessor first starts the axial fan 22 to run for 3 seconds (pre-cooling), and then starts the compressor 2; 2. After being filtered by the intake filter 18, the air enters the compressor 2 and is pressurized to 0.08-0.2MPa. The pressure overcomes the 1-2kPa elastic force of the first one-way valve 301, and the air enters the molecular sieve oxygen generation unit. 3. The main control valve 106 switches the gas path under the control of the microprocessor: First molecular sieve tower 104: Under high pressure (0.08-0.2MPa), the molecular sieve adsorbs nitrogen and produces oxygen. After being filtered by oxygen filter 13, the first solenoid valve 4 (energized and opened) delivers the oxygen to the outlet. Second molecular sieve tower 105: Under low pressure (0.01-0.05MPa), the molecular sieve desorbs nitrogen and humid air. The mixed gas overcomes the 3-4kPa elastic force of the second one-way valve 302 at the nitrogen discharge end 102 and is discharged after noise reduction by the exhaust silencer 23. 4. After 4.5 seconds, the main control valve 106 switches, and the two adsorption towers alternately complete adsorption and desorption, continuously producing qualified oxygen. The sensor group provides real-time feedback data to ensure stable system operation.

[0078] II. Shutdown Protection Phase (Core Innovation Achievement) 1. Triggering phase (0s): When the user presses the power off button, the microprocessor receives the instruction and immediately cuts off the power supply to the two normally closed solenoid valves. The first solenoid valve 4 is de-energized and closes, blocking the oxygen outlet 103 from the atmospheric passage.

[0079] 2. Delayed dehumidification stage (0-15s): The microprocessor starts a 15s timer, and the compressor 2, main control valve 106, and axial flow fan 22 continue to operate: the main control valve 106 continues to switch according to the set cycle, the first molecular sieve tower 104 (original adsorption state) switches to desorption, and discharges the residual humid air; the second molecular sieve tower 105 (original desorption state) briefly adsorbs and then desorbs again to ensure that no moisture remains in the tower; the axial flow fan 22 continues to dissipate heat, and the exhaust temperature of the compressor 2 is controlled at <60℃ (to avoid short-term overload).

[0080] 3. Sealing stage (after 15s): After the 15s countdown ends, the microprocessor triggers a total power outage, compressor 2 stops running, the gas pressure drops sharply, the springs of the first one-way valve 301 and the second one-way valve 302 reset, the valve core presses the sealing gasket, and the two molecular sieve towers are completely sealed.

[0081] 4. Final state: The relative humidity inside the two molecular sieve towers is ≤30%RH, the pressure is stable at about 0.1MPa (atmospheric pressure), and the molecular sieves are in a dry protection state, which is to prepare the optimal operating conditions for the next start-up.

[0082] The actual experimental data and testing methods of the oxygen concentrator system are as follows: Experimental conditions: ambient humidity 90% RH, oxygen generator operating pressure 0.14-0.2MPa (adsorption) / ≤0.05MPa (desorption), molecular sieve type 5A molecular sieve; Testing methods: The humidity inside the molecular sieve was measured using a thermo-hygrometer (accuracy ±1% RH), and the lifespan of the molecular sieve was measured using an oxygen generator lifespan test bench (continuous operation).

[0083] Based on the above experimental conditions and detection methods, the actual experimental data can be compared with the existing technical solutions as follows: Table 1 – Comparison of Indicators between the Technical Solution of this Application and Existing Technical Solutions

[0084] In summary, the technical solution presented in this application addresses the core pain point of "molecular sieve failure" in the oxygen concentrator industry. It innovatively proposes a synergistic solution of "two-way one-way valve + delayed shutdown," fundamentally resolving the shortcomings of existing technologies that either "only block moisture without removing it" or "only remove moisture without blocking it." Experimental data shows that the molecular sieve lifespan is extended by 150%, and failures in high-humidity environments are significantly reduced. This solution can be directly applied to home and medical oxygen concentrators, significantly improving product reliability and market competitiveness.

[0085] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram can represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks can actually be executed substantially in parallel, and they can sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or can be implemented using a combination of dedicated hardware and computer instructions.

[0086] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not, in certain circumstances, constitute a limitation on that unit within this application.

[0087] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0088] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An oxygen generator system, characterized in that, include: Molecular sieve module (1), the molecular sieve module (1) includes an air inlet end (101), a nitrogen outlet end (102) and an oxygen outlet end (103). Compressor (2), the compressor (2) is used to supply compressed air to the air inlet (101) of the molecular sieve module (1); The first valve group (3) includes a first one-way valve (301) located at the air inlet end (101) and a second one-way valve (302) located at the nitrogen discharge end (102). The first one-way valve (301) includes a conducting state that keeps the external environment supplying air to the molecular sieve module (1) and a closed state that blocks the external environment from communicating with the molecular sieve module (1). The second one-way valve (302) includes a conducting state that keeps the molecular sieve module (1) discharging nitrogen to the external environment and a closed state that blocks the external environment from communicating with the molecular sieve module (1). The intelligent delayed shutdown module is used to control the entire oxygen generator system to reach the shutdown state after receiving the shutdown command, which is delayed by a predetermined time to discharge the residual moisture in the molecular sieve module (1). When the oxygen generator system reaches the shutdown state, the compressor is turned off and the first one-way valve (301) and the second one-way valve (302) are both controlled to be in the closed state.

2. The oxygen generator system according to claim 1, characterized in that, The oxygen outlet (103) of the molecular sieve module (1) is provided with a first solenoid valve (4). The first solenoid valve (4) is used to immediately enter the closed state when the oxygen generator system receives the shutdown command, so as to block the connection between the oxygen outlet (103) of the molecular sieve module (1) and the external environment. The control signal of the first solenoid valve (4) is triggered synchronously with the shutdown command of the intelligent delayed shutdown module.

3. The oxygen generator system according to claim 1, characterized in that, The compressor (2) is used to supply compressed air to the air inlet (101) of the molecular sieve module (1). The air inlet of the compressor (2) is connected to the first one-way valve (301), and the first one-way valve (301) is connected to the air inlet (101).

4. The oxygen generator system according to claim 1, characterized in that, The first check valve (301) is a micro-pressure spring-reset check valve. When the outlet pressure of the compressor (2) increases to a first predetermined pressure value, the first check valve (301) is in the open state, so that the compressed air output by the compressor (2) enters the molecular sieve module (1) through the air inlet (101); and / or The second one-way valve (302) is a micro-pressure spring reset one-way valve. When the nitrogen discharge pressure of the molecular sieve module (1) reaches the second predetermined pressure value, the second one-way valve (302) is in the conducting state so that the nitrogen gas in the molecular sieve module (1) is discharged to the external environment through the nitrogen discharge end.

5. The oxygen generator system according to claim 1, characterized in that, The molecular sieve module (1) further includes: a first molecular sieve tower (104), a second molecular sieve tower (105), and a main control valve (106), wherein, When the oxygen generator system is in operation, the main control valve (106) is used to switch the gas path between the first molecular sieve tower (104) and the second molecular sieve tower (105) at predetermined intervals to alternately perform the adsorption stage and desorption stage of the first molecular sieve tower (104) and the second molecular sieve tower (105).

6. The oxygen generator system according to claim 5, characterized in that, The oxygen generator system also includes an oxygen storage tank (5) that is connected to the first molecular sieve tower (104) and the second molecular sieve tower (105) respectively. The first molecular sieve tower (104) is connected to the oxygen storage tank (5) through the first oxygen delivery passage (6) and is connected to the second molecular sieve tower (105) through the first purging passage (7); The second molecular sieve tower (105) is connected to the oxygen storage tank (5) through the second oxygen delivery passage (8), and is connected to the first molecular sieve tower (104) through the second purging passage (9); The first purge passage (7) and the second purge passage (9) are selectively opened and closed such that: when the first molecular sieve tower (104) supplies oxygen to the oxygen storage tank (5) through the first oxygen supply passage (6), the purge flow is provided to or interrupted to the second molecular sieve tower (105) by opening or closing the first purge passage (7); and when the second molecular sieve tower (105) supplies oxygen to the oxygen storage tank (5) through the second oxygen supply passage (8), the purge flow is provided to or interrupted to the first molecular sieve tower (104) by opening or closing the second purge passage (9).

7. The oxygen generator system according to claim 6, characterized in that, The first purging passage (7) is provided with a first control valve, which is used to control the opening and closing of the first purging passage (7), and / or the second purging passage (9) is provided with a second control valve, which is used to control the opening and closing of the second purging passage (9).

8. The oxygen generator system according to claim 7, characterized in that, The first purge passage (7) and the second purge passage (9) have an overlapping section, which constitutes a common passage for the first purge passage (7) and the second purge passage (9); the first control valve and the second control valve are both constructed as second solenoid valves (10) located in the overlapping section, and the second solenoid valve (10) synchronously controls the selective opening and closing of the first purge passage (7) and the second purge passage (9).

9. The oxygen generator system according to claim 8, characterized in that, The oxygen generator system also includes a second valve assembly (11), wherein... The second valve group (11) includes a third check valve (1101) and a fourth check valve (1102). The third check valve (1101) and the fourth check valve (1102) are connected to the second solenoid valve (10). When the first molecular sieve tower (104) is in the adsorption stage, the purge gas flow in the first molecular sieve tower (104) passes sequentially through the third check valve (1101), the second solenoid valve (10), and the fourth check valve (1102) and flows into the second molecular sieve tower (105); and / or The second valve group (11) includes a fifth one-way valve (1103) and a sixth one-way valve (1104). The fifth one-way valve (1103) and the sixth one-way valve (1104) are connected to the second solenoid valve (10). When the second molecular sieve tower (105) is in the adsorption stage, the purge gas flow in the second molecular sieve tower (105) passes through the fifth one-way valve (1103), the second solenoid valve (10) and the sixth one-way valve (1104) in sequence and flows into the first molecular sieve tower (104).

10. The oxygen generator system according to claim 9, characterized in that, The oxygen in the oxygen storage tank (5) flows into the second molecular sieve tower (105) through the second solenoid valve (10) and the fourth one-way valve (1102) in sequence; and / or the oxygen in the oxygen storage tank (5) flows into the first molecular sieve tower (104) through the second solenoid valve (10) and the sixth one-way valve (1104) in sequence.

11. The oxygen generator system according to claim 5, characterized in that, A pressure equalization valve (12) is also provided between the first molecular sieve tower (104) and the second molecular sieve tower (105); wherein, After the adsorption stage of the first molecular sieve tower (104) is completed, the gas in the first molecular sieve tower (104) flows into the second molecular sieve tower (105) through the equalizing valve (12), and / or, after the adsorption stage of the second molecular sieve tower (105) is completed, the gas in the second molecular sieve tower (105) flows into the first molecular sieve tower (104) through the equalizing valve (12).

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