Nitrogen-oxygen separation-based vehicle-mounted nitrogen suspension system and control method

Abstract

This invention discloses a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation, comprising an air compressor, a water separator, a pressure balancing valve assembly, a coaxially assembled oxygen-enriched gas storage tank, and a nitrogen-oxygen separation membrane. The pressure balancing valve assembly includes internally integrated oxygen-enriched gas pipelines and nitrogen-enriched gas pipelines, and a balancing valve. The nitrogen-enriched gas pipeline connects to the nitrogen-enriched gas storage tank and is internally connected to the storage tank. A turbine expander generator is connected to the oxygen-enriched gas pipeline, and the turbine expander generator is connected to the air compressor. The control method of this invention's vehicle-mounted nitrogen suspension system controls the flow rate and pressure difference of the nitrogen-enriched gas and oxygen-enriched gas through the pressure balancing valve assembly. The vehicle-mounted nitrogen suspension system and control method of this invention enable the nitrogen-oxygen separation membrane to adapt to the air pressure at the air compressor outlet, ensuring a stable supply of nitrogen-enriched gas. The separated oxygen-enriched gas can be used for cooling the air compressor and can also be injected into the passenger compartment to improve comfort, reduce fatigue, and ensure safety and reliability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle-mounted nitrogen suspension, and particularly relates to a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation and a control method of the vehicle-mounted nitrogen suspension system. BACKGROUND

[0002] With the development of the new energy vehicle market in China, commercial vehicles, passenger vehicles, medium and heavy trucks, and rail transit vehicles begin to be equipped with air suspension systems. In the existing air suspension systems, the gas medium used is mainly compressed air. Because of the presence of oxygen in the compressed air, the rubber airbags used in the vehicle suspension system are prone to oxidation, reducing the service life and causing leakage. Some luxury vehicles use nitrogen as the medium. However, nitrogen is pre-charged. Because of leakage during use, nitrogen needs to be recharged at irregular intervals, which is cumbersome to operate.

[0003] Membrane type nitrogen production is a commonly used method for producing nitrogen. The existing nitrogen-oxygen separation membrane is sealed by a plurality of hollow fiber membrane filaments through an outer end surface epoxy resin. The different passing selectivities of nitrogen and oxygen molecules in terms of diameter are used to make high-pressure air flow through the inside of the hollow fiber membrane filaments. The stable pressure difference between the inside and outside surfaces of the hollow fiber membrane filaments drives the separation of nitrogen and oxygen molecules. This kind of fiber membrane filament can only withstand a maximum pressure of 15 Bar. Excessive pressure will cause damage to the membrane filaments. In the existing air suspension system, a pressure as high as 20 bar is required, which is much higher than the normal working pressure of the nitrogen-oxygen separation membrane filaments. At the same time, stable pressure difference is required for the separation of nitrogen and oxygen molecules on the inside and outside surfaces of the hollow fiber membrane filaments to produce nitrogen-rich gas with stable purity. These factors determine that the existing nitrogen-oxygen separation membrane method cannot meet the demand of vehicle-mounted air suspension nitrogen-oxygen separation. SUMMARY

[0004] The application aims to provide a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation, which has the characteristics of simple operation and stable and efficient separation of nitrogen.

[0005] Another object of the application is to provide a control method of the vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation.

[0006] The technical solution adopted in this invention is a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation, comprising an air compressor, a water separator, and a nitrogen-oxygen separation device connected sequentially by pipelines. The nitrogen-oxygen separation device includes a pressure balancing valve assembly, a coaxially assembled oxygen-enriched gas storage tank, and a nitrogen-oxygen separation membrane. The pressure balancing valve assembly includes an internally integrated oxygen-enriched gas pipeline and a nitrogen-enriched gas pipeline, and a balancing valve disposed between the oxygen-enriched gas pipeline and the nitrogen-enriched gas pipeline. One end of the nitrogen-enriched gas pipeline, away from the oxygen-enriched gas storage tank, is connected to the nitrogen-enriched gas storage tank. One end of the nitrogen-enriched gas pipeline communicates with the internal space of the oxygen-enriched gas storage tank, and the other end of the nitrogen-enriched gas pipeline is connected to a turboexpander generator. The turboexpander generator is connected to the air compressor via a pipeline. The nitrogen-oxygen separation membrane extends out of the oxygen-enriched gas storage tank at both ends and is connected to the water separator and the nitrogen-enriched gas pipeline, respectively. The nitrogen-oxygen separation membrane is provided with a first oxygen-enriched gas outlet communicating with the internal space of the oxygen-enriched gas storage tank.

[0007] The technical solution of this invention is also characterized by,

[0008] The pressure balancing valve assembly has a second nitrogen-enriched gas outlet and a second oxygen-enriched gas outlet on its outer surface. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet through the balancing valve. The second nitrogen-enriched gas outlet is connected to the nitrogen-enriched gas storage tank through a pipeline. The nitrogen-enriched gas pipeline is also connected to the second nitrogen-enriched gas outlet through the balancing valve. A controllable check valve is also installed on the nitrogen-enriched gas pipeline near the second nitrogen-enriched gas outlet. The second nitrogen-enriched gas outlet is connected to the turboexpander generator through a pipeline. The end of the nitrogen-enriched gas storage tank near the pressure balancing valve assembly has a through hole that is connected to the nitrogen-enriched gas pipeline. A pressure sensor is also installed on the nitrogen-enriched gas pipeline.

[0009] The balancing valve includes a movable valve core. An adjusting spring is sleeved on one end of the movable valve core near the oxygen-enriched gas pipeline. An adjusting screw is inserted through the oxygen-enriched gas pipeline at the position corresponding to the movable valve core. One end of the adjusting screw is inserted into the oxygen-enriched gas pipeline and abuts against the adjusting spring.

[0010] The movable valve core has an obliquely opened air groove on the end side near the end of the oxygen-enriched gas pipeline, with the air groove facing the second oxygen-enriched gas outlet. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet through the air groove.

[0011] The movable valve core has a blind hole at the center of the end near the oxygen-enriched gas pipeline, and one end of the adjusting spring is nested inside the blind hole.

[0012] A normally open solenoid valve is installed on the connecting pipeline between the water separator and the oxygen-enriched gas storage tank. A compressed air bypass pipeline is installed on the connecting pipeline between the water separator and the normally open solenoid valve. The compressed air bypass pipeline is connected to the inlet of the nitrogen-enriched gas storage tank. A normally closed solenoid valve is installed on the compressed air bypass pipeline.

[0013] The nitrogen-oxygen separation membrane is provided with a compressed air inlet and a first nitrogen-rich gas outlet at both ends. The compressed air inlet is connected to the water separator, and the first nitrogen-rich gas outlet is connected to the nitrogen-rich gas pipeline.

[0014] The turboexpander generator is also connected to an oxygen-rich gas environment via pipelines, and it is also connected to a battery.

[0015] The nitrogen-rich gas storage tank is connected to shock-absorbing airbags via pipelines.

[0016] Another technical solution adopted in this invention is a control method for a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation. Using the aforementioned vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation, the method is implemented according to the following steps: When the system is started and the nitrogen-oxygen separation membrane is working normally, compressed air from the water separator enters the nitrogen-oxygen separation membrane and is separated into nitrogen-rich gas and oxygen-rich gas. The nitrogen-rich gas is stored in the nitrogen-rich gas storage tank, and the oxygen-rich gas enters the compressor after passing through the turbine expander generator. The pressure difference is controlled by adjusting the pressure balance valve group, thereby ensuring that the pressure difference value inside and outside the nitrogen-oxygen separation membrane filaments is always kept within the set range. When the nitrogen-oxygen separation membrane fails, the normally open solenoid valve closes and the normally closed solenoid valve opens, and compressed air enters the nitrogen-rich gas storage tank and shock absorber directly from the compressed air bypass pipeline.

[0017] Another feature of the technical solution of the present invention is that,

[0018] The pressure difference control method is as follows:

[0019] The adjusting pressure range of the adjusting spring is a preset range. If the pressure difference between the second nitrogen-rich gas outlet and the oxygen-rich gas pipeline side remains within the preset range, the moving valve core remains in a balanced state.

[0020] When the gas pressure on the second nitrogen-enriched gas outlet side rises to the maximum value of the pressure difference between the second nitrogen-enriched gas outlet side and the oxygen-enriched gas pipeline side, the movable valve core begins to move towards the oxygen-enriched gas pipeline side. The airflow channel between the movable valve core and the second oxygen-enriched gas outlet gradually becomes smaller, the flow rate decreases, and the pressure on the oxygen-enriched gas side gradually increases until the pressure difference returns to the preset range, and the movable valve core remains in a balanced state.

[0021] When the gas pressure at the second nitrogen-enriched gas outlet decreases to the point where the pressure difference between the second nitrogen-enriched gas outlet and the oxygen-enriched gas pipeline is less than the minimum value of the preset range, the movable valve core begins to move toward the nitrogen-enriched gas pipeline side. The airflow channel between the movable valve core and the second oxygen-enriched gas outlet gradually widens, the flow rate increases, and the pressure on the oxygen-enriched gas side gradually decreases until the pressure difference returns to the preset range, at which point the movable valve core remains in a balanced state.

[0022] The beneficial effects of this invention are:

[0023] The present invention relates to a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation, which coaxially assembles and installs a nitrogen-oxygen separation membrane and an oxygen-enriched gas storage tank. The nitrogen-oxygen separation membrane is installed inside the oxygen-enriched gas storage tank, reducing the size and weight of the device. Under the control of the pressure balance valve group, the compressor and the oxygen-enriched gas separated by the nitrogen-oxygen separation membrane provide back pressure on the outer surface of the hollow fiber membrane of the nitrogen-oxygen separation, enabling the nitrogen-oxygen separation membrane to work under the high-pressure requirements of air suspension.

[0024] High-pressure nitrogen-rich gas is generated by a nitrogen-oxygen separation membrane and injected into the shock absorber airbags in the nitrogen suspension system. This can isolate the air spring vulcanized rubber airbags from oxygen oxidation, slow down aging, improve the oxidation resistance of the shock absorber airbags, and extend the life of the suspension system. At the same time, nitrogen-rich gas has a lower expansion coefficient than compressed air, resulting in a lower leakage rate in the shock absorber airbags. Nitrogen-rich gas also has a lower audio conductivity, reducing chassis suspension noise transmission and improving the NVH comfort of the car chassis air suspension.

[0025] The present invention relates to a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation. The excess dry and clean oxygen-enriched gas generated by the separation can be used as needed. It can be used to cool the air compressor, extend the working time of the air compressor, and also fill the passenger compartment to form an oxygen-enriched space, improve passenger comfort, reduce driver fatigue, and improve driving safety. A turbine expansion generator is set at the second oxygen-enriched gas outlet, which can perform energy conversion to charge the battery and at the same time provide cooling oxygen-enriched gas for the air compressor.

[0026] The vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation of the present invention is equipped with a backup compressed air bypass pipeline, a normally open solenoid valve and a normally closed solenoid valve, to continue to fill the shock absorber with high-pressure compressed air. This can ensure that the vehicle suspension system can operate normally in the event of membrane failure, and provide time for emergency repair of the nitrogen-oxygen separation membrane.

[0027] The control method of the vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation of the present invention places the nitrogen-oxygen separation membrane fiber in the oxygen-enriched gas storage tank. Under the control of the pressure balance valve group, a stable pressure difference is formed inside and outside the fiber membrane fiber, thereby generating high-pressure nitrogen-enriched gas with stable purity. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation according to the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the nitrogen-oxygen separation membrane in the vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation of the present invention;

[0030] Figure 3 This is the present invention. Figure 1 A schematic diagram of the structure of the balance valve.

[0031] In the diagram: 1. Air compressor, 2. Water separator, 3. Compressed air inlet, 4. Nitrogen-oxygen separation membrane, 5. Oxygen-enriched gas storage tank, 6. First oxygen-enriched gas outlet, 7. First nitrogen-enriched gas outlet, 8. Pressure balancing valve assembly, 9. Balancing valve, 10. Second nitrogen-enriched gas outlet, 11. Second oxygen-enriched gas outlet, 12. Nitrogen-enriched gas storage tank, 13. Shock-absorbing airbag, 14. Oxygen-enriched gas environment, 15. Normally open solenoid valve, 16. Turbofacial expander generator, 17. Normally closed solenoid valve, 18. Hollow fiber membrane, 19. Inside of hollow fiber membrane, 20. Outside of hollow fiber membrane, 21. Movable valve core, 22. Adjusting screw, 23. Adjusting spring, 24. Air tank. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] The nitrogen-oxygen separation-based vehicle-mounted nitrogen suspension system of the present invention has the following structure: Figure 1 As shown, air compressor 1 is connected to water separator 2 through an air pipeline, and water separator 2 is connected to nitrogen-oxygen separation membrane device through an air pipeline.

[0034] like Figure 1 and Figure 3 As shown, the nitrogen-oxygen separation membrane device includes a pressure balancing valve group 8, a gas storage tank 5, and a nitrogen-oxygen separation membrane 4 coaxially assembled inside the oxygen-enriched gas storage tank 5; by assembling the nitrogen-oxygen separation membrane 4 inside the oxygen-enriched gas storage tank 5, the size and weight of the device can be reduced.

[0035] The nitrogen-oxygen separation membrane 4 extends through the oxygen-enriched gas storage tank 5 at both ends and is fixed thereon. Compressed air inlet 3 and first nitrogen-enriched gas outlet 7 are respectively provided at both ends. The compressed air inlet 3 is connected to the water separator 2. The nitrogen-oxygen separation membrane 4 is also provided with a first oxygen-enriched gas outlet 6. The first oxygen-enriched gas outlet 6 is connected to the space inside the oxygen-enriched gas storage tank 5 located outside the nitrogen-oxygen separation membrane 4. The oxygen-enriched gas storage tank 5 has a through hole at one end near the pressure balancing valve group 8. The through hole is connected to the oxygen-enriched gas pipeline through a pipeline. The oxygen-enriched gas separated by the nitrogen-oxygen separation membrane 4 is connected to the oxygen-enriched gas pipeline inside the pressure balancing valve group 8 after passing through the oxygen-enriched gas outlet 6 and the through hole.

[0036] like Figure 2As shown, the pressure balancing valve assembly 8 integrates a nitrogen-enriched gas pipeline and an oxygen-enriched gas pipeline. A pressure sensor is also installed on the oxygen-enriched gas pipeline. A balancing valve 9 is installed between the oxygen-enriched gas pipeline and the nitrogen-enriched gas pipeline to adjust the flow rate and differential pressure at the outlets of the nitrogen-enriched and oxygen-enriched gases. One end of the nitrogen-enriched gas pipeline has a second nitrogen-enriched gas outlet 10, which connects to a nitrogen-enriched gas storage tank 12 in the nitrogen suspension system. The nitrogen-enriched gas storage tank 12 is connected to a shock-absorbing airbag 13. The other end of the nitrogen-enriched gas pipeline is connected to the first nitrogen-enriched gas outlet 7 of the nitrogen-oxygen separation membrane 4. One end of the oxygen-enriched gas pipeline connects to the internal space of the oxygen-enriched gas storage tank 5 through a through-hole. A controllable high-pressure gas back pressure is provided to the hollow fiber membrane filaments 20 outside the nitrogen-oxygen separation membrane 4 through the oxygen-enriched gas outlet 6. This creates a pressure difference between the inside 19 of the hollow fiber membrane filaments and the inside of the oxygen-enriched gas storage tank 5, enabling the nitrogen-oxygen separation membrane to operate under the high-pressure requirements of nitrogen suspension. The other end of the oxygen-enriched gas pipeline has a second oxygen-enriched gas outlet 11, which is connected to a turbine expander generator 16 via a pipeline. The turbine expander generator 16 is connected to the air compressor 1 via a pipeline. The oxygen-enriched gas flows out from the second oxygen-enriched gas outlet 11 on the pressure balancing valve assembly 8, passes through the turbine expander generator 16, and then flows into the cooling gas inlet of the compressor 1. The exhaust energy of high-pressure oxygen-enriched gas is used to drive the turbine expander generator 16 to generate electricity. After the temperature of the oxygen-enriched compressed gas inside the turbine expansion chamber is reduced, it flows into the cooling gas inlet of the air compressor 1, providing the air compressor 1 with a low-temperature air medium. This achieves the purpose of simultaneously recovering energy and reducing the operating temperature of the air compressor 1, extending the working time of the air compressor 1 and preventing the air compressor 1 from stopping due to excessive temperature.

[0037] The separated oxygen-enriched gas can be used as needed. The turboexpansion generator 16 can also be connected to other oxygen-enriched gas environments 14 on the vehicle to form an oxygen-enriched space. The oxygen-enriched gas environment 14 serves as the passenger cabin, which can improve passenger comfort, reduce driver fatigue, and improve driving safety.

[0038] The turboexpansion generator 16 can also be connected to a battery to generate electricity for the battery.

[0039] The nitrogen-oxygen separation device separates dry compressed air into nitrogen-rich gas and oxygen-rich gas. The nitrogen-rich gas is stored in the nitrogen-rich gas tank 12 through the gas pipeline from the second nitrogen-rich gas outlet 10 on the pressure balance valve group 8. It then flows into the shock absorber airbag 13 through the pipeline. High-pressure nitrogen-rich gas is generated through the nitrogen-oxygen separation membrane 4 and fills the shock absorber airbag 13 in the nitrogen suspension system. This can isolate the air spring vulcanized rubber airbag from oxygen oxidation, slow down aging, improve the oxidation resistance of the shock absorber airbag 13, and extend the life of the suspension system. At the same time, the expansion coefficient of nitrogen-rich gas is lower than that of compressed air, resulting in a low leakage rate in the shock absorber airbag 13. The low audio conductivity of nitrogen-rich gas reduces chassis suspension noise transmission and improves the NVH comfort of the car chassis air suspension.

[0040] like Figure 1 and Figure 3 As shown, the balancing valve 9 includes a movable valve core 21. An inverted triangular groove 24 is obliquely opened on one side of the movable valve core 21 near the end of the oxygen-enriched gas pipeline, facing the second oxygen-enriched gas outlet 11. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet 11 through the groove 24. A controllable one-way valve is integrated on the nitrogen-enriched gas pipeline near the second nitrogen-enriched gas outlet 10 to control the initial pressure of the nitrogen-enriched gas. An adjusting screw 22 passes through the oxygen-enriched gas pipeline at the position corresponding to the movable valve core 21. A blind hole is opened at the center of the end of the movable valve core 21 near the oxygen-enriched gas pipeline. One end of the adjusting spring 23 is nested inside the blind hole, and the other end of the adjusting spring 23 abuts against the adjusting screw 22. The nitrogen-enriched gas pipeline and the oxygen-enriched gas pipeline achieve adaptive pressure regulation through the movable valve core 21. By adjusting the adjusting screw 22, the adjusting spring 23 generates elastic force, driving the movable valve core 21 to move, thereby controlling the pressure difference between the nitrogen-enriched gas and the oxygen-enriched gas.

[0041] A normally open solenoid valve 15 is installed on the connecting pipeline between the outlet of water separator 2 and the inlet of oxygen-enriched gas storage tank 5. A compressed air bypass pipeline is installed on the connecting pipeline between water separator 2 and normally open solenoid valve 15. The compressed air bypass pipeline is connected to the inlet of nitrogen-enriched gas storage tank 12, and a normally closed solenoid valve 17 is installed on the compressed air bypass pipeline. When the hollow fiber membrane 18 of nitrogen-oxygen separation membrane 4 ruptures or fails, the pressure sensor detects that the internal pressure of oxygen-enriched gas storage tank 5 will rise sharply and deviate from the equilibrium pressure. At this time, normally open solenoid valve 15 closes and normally closed solenoid valve 17 opens. Compressed air from water separator 2 bypasses nitrogen-oxygen separation membrane 4 and enters nitrogen-enriched gas storage tank 12 and shock absorber 13 directly through the compressed air bypass pipeline. This ensures that the vehicle suspension system can operate normally in the event of damage or rupture of hollow fiber membrane 18, and provides time for emergency repair of nitrogen-oxygen separation membrane 4.

[0042] The working principle of the vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation of this invention is as follows: Air compressor 1 is connected to water separator 2 through an air pipeline. Water separator 2 separates the moisture from the compressed air. The dry compressed air enters nitrogen-oxygen separation membrane 4 through compressed air inlet 3. Nitrogen-oxygen separation membrane 4 separates the dry compressed air into nitrogen-rich gas and oxygen-rich gas. Nitrogen-rich gas enters pressure balancing valve group 8 through first nitrogen-rich gas outlet 7, and oxygen-rich gas enters oxygen-rich gas storage tank 5 through first oxygen-rich gas outlet 6 and then flows into pressure balancing valve group 8. Pressure balancing valve group 8 is used to adjust the flow rate and pressure difference of nitrogen-rich and oxygen-rich gas outlets. A controllable one-way valve is installed at the second nitrogen-enriched gas outlet 10. A balance valve 9 is installed between the nitrogen-enriched gas pipeline and the oxygen-enriched gas pipeline. Under the action of the balance valve 9, a stable pressure difference is formed between the nitrogen-enriched gas and the oxygen-enriched gas, which is the internal and external pressure difference of the nitrogen-oxygen separation membrane wire, thereby ensuring that the nitrogen-oxygen separation membrane generates high-pressure nitrogen-enriched gas. The high-pressure nitrogen-enriched gas enters the nitrogen-enriched gas storage tank 12 and the shock-absorbing airbag 13 or other occasions where nitrogen-enriched gas is required. The oxygen-enriched gas enters the turbine expander generator 16 and flows into the air compressor cooling air circuit or other oxygen-enriched gas environment 14 that requires oxygen. The turbine expander generator 16 can also generate electricity for the battery.

[0043] The present invention relates to a control method for a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation. The method employs the aforementioned vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation and is implemented according to the following steps: When the system is started and the nitrogen-oxygen separation membrane 4 is working normally, the compressed air from the water separator 2 enters the nitrogen-oxygen separation membrane 4 and is separated into nitrogen-rich gas and oxygen-rich gas. The nitrogen-rich gas is stored in the nitrogen-rich gas storage tank 12, and the oxygen-rich gas enters the compressor 1 after passing through the turbine expander generator 16. The pressure difference is controlled by adjusting the pressure balance valve group 8, thereby ensuring that the pressure difference value inside and outside the membrane fiber of the nitrogen-oxygen separation membrane 4 is always kept within the set range.

[0044] When the nitrogen-oxygen separation membrane 4 fails, the normally open solenoid valve 15 closes and the normally closed solenoid valve 17 opens, allowing compressed air to directly enter the nitrogen-rich gas storage tank 12 and the shock-absorbing airbag 13 from the compressed air bypass pipeline.

[0045] The pressure difference control method is as follows: the adjustment pressure range of the adjusting spring 23 is a preset range. If the pressure difference between the second nitrogen-rich gas outlet 10 and the oxygen-rich gas pipeline side remains within the preset range, the movable valve core 21 remains in a balanced state.

[0046] By adjusting the pressure of the regulating spring 23, the sum of the pressure on the oxygen-enriched gas pipeline side and the preset pressure of the regulating spring 23 is made equal to the pressure at the second nitrogen-enriched gas outlet 10, thereby maintaining the pressure difference across the movable valve core 21 within the preset pressure adjustment range of the regulating spring 23. The pressure difference adjustment formula is: P N* S N =P O* SO+ kx, where P N S represents the pressure of nitrogen-rich gas. N P represents the area of ​​the nitrogen-rich gas end of the active valve core. O S represents the pressure of oxygen-rich gas. O The area of ​​the oxygen-enriched end of the moving valve core is represented by k, the spring constant is represented by x, and the spring adjustment distance is represented by x.

[0047] At the nitrogen-enriched gas pipeline end, the pressure rises rapidly under the action of the controllable check valve, while the pressure rises more slowly in the oxygen-enriched gas pipeline due to the oxygen-enriched gas storage tank 5.

[0048] When the gas pressure on the second nitrogen-enriched gas outlet 10 side rises to the maximum value of the pressure difference between the second nitrogen-enriched gas outlet 10 side and the oxygen-enriched gas pipeline side, the movable valve core 21 begins to move towards the oxygen-enriched gas pipeline side. The airflow channel between the movable valve core 21 and the second oxygen-enriched gas outlet 11 gradually becomes smaller, the flow rate decreases, and the pressure on the oxygen-enriched gas side gradually increases until the pressure difference returns to the preset range. The movable valve core 21 then remains in a balanced state.

[0049] When the gas pressure on the second nitrogen-enriched gas outlet 10 side decreases to the point where the pressure difference between the second nitrogen-enriched gas outlet 10 and the oxygen-enriched gas pipeline side is less than the minimum value of the preset range, the movable valve core 21 begins to move towards the nitrogen-enriched gas pipeline side. The airflow channel between the movable valve core 21 and the second oxygen-enriched gas outlet 11 gradually increases, the flow rate increases, and the pressure on the oxygen-enriched gas side gradually decreases until the pressure difference returns to the preset range, and the movable valve core 21 remains in a balanced state.

[0050] Example 1

[0051] The vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation includes an air compressor 1, a water separator 2, and a nitrogen-oxygen separation device connected sequentially by pipelines. The nitrogen-oxygen separation device includes a pressure balancing valve group 8, a coaxially assembled oxygen-enriched gas storage tank 5, and a nitrogen-oxygen separation membrane 4. The pressure balancing valve group 8 includes an internally integrated oxygen-enriched gas pipeline and a nitrogen-enriched gas pipeline, and a balancing valve 9 located between the oxygen-enriched gas pipeline and the nitrogen-enriched gas pipeline. A pressure sensor is also installed on the oxygen-enriched gas pipeline. The end of the nitrogen-enriched gas pipeline away from the oxygen-enriched gas storage tank 5 is connected to a nitrogen-enriched gas storage tank 12. The nitrogen-enriched gas storage tank 12 is connected to a shock-absorbing airbag 13 through a pipeline. One end of the oxygen-enriched gas pipeline is connected to the space inside the oxygen-enriched gas storage tank 5 located outside the nitrogen-oxygen separation membrane 4. The other end of the oxygen-enriched gas pipeline is connected to a turboexpander generator 16 through a pipeline. The turboexpander generator 16 is connected to the air compressor 1 through a pipeline. Both ends of the nitrogen-oxygen separation membrane 4 extend out of the oxygen-enriched gas storage tank 5 and are connected to the water separator 2 and the nitrogen-enriched gas pipeline, respectively. The turboexpansion generator 16 is also connected to the oxygen-enriched gas environment 14 via a pipeline, and the turboexpansion generator 16 is also connected to a battery.

[0052] The nitrogen-oxygen separation membrane 4 is provided with a compressed air inlet 3 and a first nitrogen-rich gas outlet 7 at both ends. The compressed air inlet 3 is connected to the water separator 2, and the first nitrogen-rich gas outlet 7 is connected to the nitrogen-rich gas pipeline. The nitrogen-oxygen separation membrane 4 is also provided with a first oxygen-rich gas outlet 6, which is connected to the oxygen-rich gas storage tank 5.

[0053] The outer surface of the pressure balancing valve assembly 8 is provided with a second nitrogen-enriched gas outlet 10 and a second oxygen-enriched gas outlet 11. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet 11 through a balancing valve 9. The second nitrogen-enriched gas outlet 10 is connected to the nitrogen-enriched gas storage tank 12 through a pipeline. The nitrogen-enriched gas pipeline is connected to the second nitrogen-enriched gas outlet 10 through a balancing valve 9. A controllable one-way valve is also provided on the nitrogen-enriched gas pipeline near the second nitrogen-enriched gas outlet 10. The second nitrogen-enriched gas outlet 11 is connected to the turboexpander generator 16 through a pipeline. The end of the nitrogen-enriched gas storage tank 5 near the pressure balancing valve assembly 8 is provided with a through hole, which is connected to the nitrogen-enriched gas pipeline.

[0054] The balancing valve 9 includes a movable valve core 21. A blind hole is provided at the center of the end of the movable valve core 21 near the oxygen-enriched gas pipeline. One end of the adjusting spring 23 is nested inside the blind hole. An adjusting screw 22 is provided at the position corresponding to the movable valve core 21 in the oxygen-enriched gas pipeline. One end of the adjusting screw 22 is inserted into the oxygen-enriched gas pipeline and abuts against the adjusting spring 23. An air groove 24 is obliquely provided on one side of the movable valve core 21 near the end of the oxygen-enriched gas pipeline. The air groove 24 faces the second oxygen-enriched gas outlet 11. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet 11 through the air groove 24.

[0055] A normally open solenoid valve 15 is installed on the connecting pipeline between the water separator 2 and the oxygen-enriched gas storage tank 5. A compressed air bypass pipeline is installed on the connecting pipeline between the water separator 2 and the normally open solenoid valve 15. The compressed air bypass pipeline is connected to the inlet of the nitrogen-enriched gas storage tank 12. A normally closed solenoid valve 17 is installed on the compressed air bypass pipeline.

[0056] Example 2

[0057] A vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation includes an air compressor 1, a water separator 2, and a nitrogen-oxygen separation device connected sequentially via pipelines. The nitrogen-oxygen separation device includes a pressure balancing valve assembly 8, a coaxially mounted oxygen-enriched gas storage tank 5, and a nitrogen-oxygen separation membrane 4. The pressure balancing valve assembly 8 includes internally integrated oxygen-enriched gas pipelines and nitrogen-enriched gas pipelines, and a balancing valve 9 positioned between the oxygen-enriched gas pipelines and nitrogen-enriched gas pipelines. The nitrogen-oxygen separation membrane 4 extends through both ends of the oxygen-enriched gas storage tank 5 and connects to the water separator 2 and the nitrogen-enriched gas pipeline, respectively. The oxygen-enriched gas pipeline also includes… A pressure sensor is installed. The end of the nitrogen-enriched gas pipeline furthest from the oxygen-enriched gas storage tank 5 is connected to a nitrogen-enriched gas storage tank 12. The nitrogen-enriched gas storage tank 12 is connected to a shock-absorbing airbag 13 via a pipeline. One end of the oxygen-enriched gas pipeline communicates with the space inside the oxygen-enriched gas storage tank 5 outside the nitrogen-oxygen separation membrane 4. The other end of the oxygen-enriched gas pipeline is connected to a turboexpander generator 16 via a pipeline. The turboexpander generator 16 is connected to an air compressor 1 via a pipeline. Both ends of the nitrogen-oxygen separation membrane 4 extend out of the oxygen-enriched gas storage tank 5 and are connected to the water separator 2 and the nitrogen-enriched gas pipeline, respectively. The turboexpander generator 16 is also connected to an oxygen-enriched gas environment 14 via a pipeline; the oxygen-enriched gas environment 14 is the cockpit.

[0058] The nitrogen-oxygen separation membrane 4 is provided with a compressed air inlet 3 and a first nitrogen-rich gas outlet 7 at both ends. The compressed air inlet 3 is connected to the water separator 2, and the first nitrogen-rich gas outlet 7 is connected to the nitrogen-rich gas pipeline. The nitrogen-oxygen separation membrane 4 is also provided with a first oxygen-rich gas outlet 6, which is connected to the oxygen-rich gas storage tank 5.

[0059] The outer surface of the pressure balancing valve assembly 8 is provided with a second nitrogen-enriched gas outlet 10 and a second oxygen-enriched gas outlet 11. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet 11 through a balancing valve 9. The second nitrogen-enriched gas outlet 10 is connected to the nitrogen-enriched gas storage tank 12 through a pipeline. The nitrogen-enriched gas pipeline is connected to the second nitrogen-enriched gas outlet 10 through a balancing valve 9. A controllable one-way valve is also provided on the nitrogen-enriched gas pipeline near the second nitrogen-enriched gas outlet 10. The second nitrogen-enriched gas outlet 11 is connected to the turboexpander generator 16 through a pipeline. The end of the nitrogen-enriched gas storage tank 5 near the pressure balancing valve assembly 8 is provided with a through hole, which is connected to the nitrogen-enriched gas pipeline.

[0060] The balancing valve 9 includes a movable valve core 21. An adjusting screw 22 passes through the oxygen-enriched gas pipeline at a position corresponding to the movable valve core 21. An adjusting spring 23 is sleeved on the movable valve core 21 near the oxygen-enriched gas pipeline, and the adjusting spring 23 abuts against the adjusting screw 22. An air groove 24 is obliquely opened on one side of the movable valve core 21 near the end of the oxygen-enriched gas pipeline, and the air groove 24 faces the second oxygen-enriched gas outlet 11. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet 11 through the air groove 24.

[0061] Example 3

[0062] The vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation includes an air compressor 1, a water separator 2, and a nitrogen-oxygen separation device connected sequentially via pipelines. The nitrogen-oxygen separation device includes a pressure balancing valve assembly 8, a coaxially mounted oxygen-enriched gas storage tank 5, and a nitrogen-oxygen separation membrane 4. The pressure balancing valve assembly 8 includes internally integrated oxygen-enriched gas pipelines and nitrogen-enriched gas pipelines, and a balancing valve 9 positioned between the oxygen-enriched gas pipelines and nitrogen-enriched gas pipelines. The nitrogen-oxygen separation membrane 4 extends through the oxygen-enriched gas storage tank 5 at both ends and connects to the water separator 2 and the nitrogen-enriched gas pipeline, respectively. The oxygen-enriched gas pipeline is also equipped with… Equipped with a pressure sensor, the nitrogen-enriched gas pipeline is connected to a nitrogen-enriched gas storage tank 12 at one end, away from the oxygen-enriched gas storage tank 5. The nitrogen-enriched gas storage tank 12 is connected to other applications requiring nitrogen-enriched gas via pipelines. One end of the oxygen-enriched gas pipeline is connected to the space inside the oxygen-enriched gas storage tank 5 outside the nitrogen-oxygen separation membrane 4, and the other end of the oxygen-enriched gas pipeline is connected to a turboexpander generator 16 via a pipeline. The turboexpander generator 16 is connected to an air compressor 1 via a pipeline. Both ends of the nitrogen-oxygen separation membrane 4 extend out of the oxygen-enriched gas storage tank 5 and are connected to the water separator 2 and the nitrogen-enriched gas pipeline, respectively. The turboexpander generator 16 is also connected to a battery.

[0063] The nitrogen-oxygen separation membrane 4 is provided with a compressed air inlet 3 and a first nitrogen-rich gas outlet 7 at both ends. The compressed air inlet 3 is connected to the water separator 2, and the first nitrogen-rich gas outlet 7 is connected to the nitrogen-rich gas pipeline. The nitrogen-oxygen separation membrane 4 is also provided with a first oxygen-rich gas outlet 6, which is connected to the oxygen-rich gas storage tank 5.

[0064] The pressure balancing valve assembly 8 has a second nitrogen-enriched gas outlet 10 and a second oxygen-enriched gas outlet 11 on its outer surface. The oxygen-enriched gas pipeline is connected to the second nitrogen-enriched gas outlet 11 through a balancing valve 9. The second nitrogen-enriched gas outlet 10 is connected to the nitrogen-enriched gas storage tank 12 through a pipeline. The nitrogen-enriched gas pipeline is connected to the second nitrogen-enriched gas outlet 10 through a balancing valve 9. A controllable check valve is also installed on the nitrogen-enriched gas pipeline near the second nitrogen-enriched gas outlet 10. The second nitrogen-enriched gas outlet 11 is connected to the turboexpander generator 16 through a pipeline.

[0065] The balancing valve 9 includes a movable valve core 21. An adjusting screw 22 passes through the oxygen-enriched gas pipeline at a position corresponding to the movable valve core 21. An adjusting spring 23 is sleeved on the end of the movable valve core 21 near the oxygen-enriched gas pipeline, and the adjusting spring 23 abuts against the adjusting screw 22. An air groove 24 is obliquely opened on the end of the movable valve core 21 near the oxygen-enriched gas pipeline, and the air groove 24 faces the second oxygen-enriched gas outlet 11. The oxygen-enriched gas pipeline is connected to the second oxygen-enriched gas outlet 11 through the air groove 24.

[0066] Example 4

[0067] This invention relates to a control method for a vehicle-mounted nitrogen suspension system based on nitrogen-oxygen separation. The method employs the nitrogen-oxygen separation-based vehicle-mounted nitrogen suspension system of Example 1, and is implemented according to the following steps: When the system is started and the nitrogen-oxygen separation membrane 4 is working normally, compressed air from the water separator 2 enters the nitrogen-oxygen separation membrane 4 and is separated into nitrogen-rich gas and oxygen-rich gas. The nitrogen-rich gas is stored in the nitrogen-rich gas storage tank 12, while the oxygen-rich gas enters the compressor 1 after passing through the turbine expander generator 16. The pressure difference is controlled by adjusting the pressure balance valve group 8, thereby ensuring that the pressure difference value inside and outside the membrane fibers of the nitrogen-oxygen separation membrane 4 is always maintained within the set range. When the nitrogen-oxygen separation membrane 4 malfunctions, the normally open solenoid valve 15 closes, and the normally closed solenoid valve 17 opens, allowing compressed air to directly enter the nitrogen-rich gas storage tank 12 and the shock absorber airbag 13 from the compressed air bypass pipeline.

[0068] The pressure difference control method is as follows: the adjustment pressure range of the adjusting spring 23 is a preset range. If the pressure difference between the second nitrogen-rich gas outlet 10 and the oxygen-rich gas pipeline side remains within the preset range, the movable valve core 21 remains in a balanced state.

[0069] When the gas pressure on the second nitrogen-enriched gas outlet 10 side rises to the maximum value of the pressure difference between the second nitrogen-enriched gas outlet 10 side and the oxygen-enriched gas pipeline side, the movable valve core 21 begins to move towards the oxygen-enriched gas pipeline side. The airflow channel between the movable valve core 21 and the second oxygen-enriched gas outlet 11 gradually becomes smaller, the flow rate decreases, and the pressure on the oxygen-enriched gas side gradually increases until the pressure difference returns to the preset range. The movable valve core 21 then remains in a balanced state.

[0070] When the gas pressure on the second nitrogen-enriched gas outlet 10 side decreases to the point where the pressure difference between the second nitrogen-enriched gas outlet 10 and the oxygen-enriched gas pipeline side is less than the minimum value of the preset range, the movable valve core 21 begins to move towards the nitrogen-enriched gas pipeline side. The airflow channel between the movable valve core 21 and the second oxygen-enriched gas outlet 11 gradually increases, the flow rate increases, and the pressure on the oxygen-enriched gas side gradually decreases until the pressure difference returns to the preset range, and the movable valve core 21 remains in a balanced state.

[0071] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A vehicle-mounted nitrogen suspension system based on separation of nitrogen and oxygen, characterized in that, The application relates to a nitrogen-oxygen separation device, which comprises an air compressor (1), a water separator (2) and a nitrogen-oxygen separation device connected in sequence through pipelines, wherein the nitrogen-oxygen separation device comprises a pressure balance valve group (8), a coaxially assembled oxygen-rich gas storage tank (5) and a nitrogen-oxygen separation membrane (4); the pressure balance valve group (8) comprises internally integrated oxygen-rich gas pipelines and nitrogen-rich gas pipelines, and a balance valve (9) arranged between the oxygen-rich gas pipelines and the nitrogen-rich gas pipelines; one end of the nitrogen-rich gas pipeline, which is far away from the oxygen-rich gas storage tank (5), is connected with a nitrogen-rich gas storage tank (12) through a pipeline; one end of the oxygen-rich gas pipeline is in communication with the internal space of the oxygen-rich gas storage tank (5); the other end of the oxygen-rich gas pipeline is connected with a turboexpansion generator (16) through a pipeline; the turboexpansion generator (16) is connected with the air compressor (1) through a pipeline; the nitrogen-oxygen separation membrane (4) penetrates through the oxygen-rich gas storage tank (5) at two ends and is connected with the water separator (2) and the nitrogen-rich gas pipeline respectively; and a first oxygen-rich gas outlet (6) in communication with the internal space of the oxygen-rich gas storage tank (5) is arranged on the nitrogen-oxygen separation membrane (4). A second nitrogen-rich gas outlet (10) and a second oxygen-rich gas outlet (11) are arranged on the outer surface of the pressure balance valve group (8); the oxygen-rich gas pipeline is in communication with the second oxygen-rich gas outlet (11) through the balance valve (9); the second nitrogen-rich gas outlet (10) is connected with the nitrogen-rich gas storage tank (12) through a pipeline; the nitrogen-rich gas pipeline is in communication with the second nitrogen-rich gas outlet (10) through the balance valve (9); a controllable one-way valve is further arranged at the position of the nitrogen-rich gas pipeline close to the second nitrogen-rich gas outlet (10); the second oxygen-rich gas outlet (11) is connected with the turboexpansion generator (16) through a pipeline; one end of the oxygen-rich gas storage tank (5) close to the pressure balance valve group (8) is provided with a through hole in communication with the oxygen-rich gas pipeline; and a pressure sensor is further arranged on the oxygen-rich gas pipeline. The balance valve (9) comprises a movable valve core (21); an adjusting spring (23) is sleeved with one end of the movable valve core (21) close to the oxygen-rich gas pipeline; an adjusting screw (22) is arranged at the position corresponding to the movable valve core (21) and the oxygen-rich gas pipeline; and one end of the adjusting screw (22) penetrates into the oxygen-rich gas pipeline and abuts against the adjusting spring (23). An air groove (24) is obliquely arranged on one side of the end of the movable valve core (21) close to the oxygen-rich gas pipeline; the air groove (24) faces the second oxygen-rich gas outlet (11); and the oxygen-rich gas pipeline is in communication with the second oxygen-rich gas outlet (11) through the air groove (24).

2. The on-board nitrogen gas suspension system based on separation of nitroxides according to claim 1, characterized in that, A blind hole is arranged at the center of the end of the movable valve core (21) close to the oxygen-rich gas pipeline; and one end of the adjusting spring (23) is nested in the blind hole.

3. The on-board nitrogen gas suspension system based on separation of nitroxides according to claim 1, characterized in that, The water separator (2) and the connecting pipeline of the oxygen-rich gas tank (5) are provided with a normally open electromagnetic valve (15), the connecting pipeline of the water separator (2) and the normally open electromagnetic valve (15) is provided with a compressed air bypass pipeline, the compressed air bypass pipeline is connected to the inlet of the nitrogen-rich gas tank (12), and the compressed air bypass pipeline is provided with a normally closed electromagnetic valve (17).

4. The on-board nitrogen gas suspension system based on separation of nitroxides according to claim 1, characterized in that, The nitrogen-oxygen separation membrane (4) is respectively provided with a compressed air inlet (3) and a first nitrogen-rich gas outlet (7) at two ends, the compressed air inlet (3) is connected to the water separator (2), and the first nitrogen-rich gas outlet (7) is connected to the nitrogen-rich gas pipeline.

5. The on-board nitrogen gas suspension system based on separation of nitroxides according to claim 1, characterized in that, The turbo-expander generator (16) is also connected to the oxygen-rich gas environment (14) through a pipeline, and the turbo-expander generator (16) is also connected to a battery.

6. The on-board nitrogen gas suspension system based on separation of nitroxides according to claim 1, characterized in that, The nitrogen-rich gas tank (12) is connected with a shock absorption air bag (13) through a pipeline.

7. Method for controlling a vehicle-mounted nitrogen suspension system based on separation of nitrogen and oxygen, characterized in that The nitrogen-oxygen separation-based vehicle-mounted nitrogen gas suspension system according to any one of claims 1-6 is used, and the following steps are specifically implemented: starting the system, when the nitrogen-oxygen separation membrane (4) is normally working, the compressed air from the water separator (2) enters the nitrogen-oxygen separation membrane (4) to be separated into nitrogen-rich gas and oxygen-rich gas, the nitrogen-rich gas enters the nitrogen-rich gas tank (12) to be stored, and the oxygen-rich gas enters the compressor (1) after the turbo-expander generator (16); the pressure difference is controlled through the pressure balance valve group (8), so that the pressure difference between the inside and outside of the membrane of the nitrogen-oxygen separation membrane (4) is always maintained within a set range; when the nitrogen-oxygen separation membrane (4) is faulty, the normally open electromagnetic valve (15) is closed, and the normally closed electromagnetic valve (17) is opened, so that the compressed air directly enters the nitrogen-rich gas tank (12) and the shock absorption air bag (13) from the compressed air bypass pipeline.

8. The control method of the on-board nitrogen gas suspension system based on separation of nitroxides according to claim 7, characterized in that, The control method of the pressure difference is as follows: The adjustment pressure range of the adjusting spring (23) is a preset range, if the pressure difference between the second nitrogen-rich gas outlet (10) and the oxygen-rich gas pipeline side is maintained within the preset range, the movable valve core (21) is kept in a balanced state, when the gas pressure on the second nitrogen-rich gas outlet (10) side rises, and the pressure difference between the second nitrogen-rich gas outlet (10) side and the oxygen-rich gas pipeline side is greater than the maximum value of the preset range, the movable valve core (21) starts to move to the oxygen-rich gas pipeline side, the gas flow passage between the movable valve core (21) and the second oxygen-rich gas outlet (11) gradually becomes smaller, the flow rate gradually becomes smaller, the pressure on the oxygen-rich gas side gradually rises, and until the pressure difference is restored to the preset range, the movable valve core (21) is kept in a balanced state; when the gas pressure on the second nitrogen-rich gas outlet (10) side drops, and the pressure difference between the second nitrogen-rich gas outlet (10) and the oxygen-rich gas pipeline side is less than the minimum value of the preset range, the movable valve core (21) starts to move to the nitrogen-rich gas pipeline side, the gas flow passage between the movable valve core (21) and the second oxygen-rich gas outlet (11) gradually becomes larger, the flow rate gradually becomes larger, the pressure on the oxygen-rich gas side gradually drops, and until the pressure difference is restored to the preset range, the movable valve core (21) is kept in a balanced state.

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