Air suspension closed type air supply system

Abstract

The utility model discloses a closed type air supply system of an air suspension. The closed type air supply system comprises at least one air spring air bag and an air supply loop used for inflating and deflating the air spring air bag. The air supply loop comprises a high-pressure pipeline, a low-pressure pipeline and a circulating air supply pipeline; wherein the high-pressure pipeline comprises a high-pressure air storage tank, an air inlet and an air outlet of the high-pressure air storage tank are communicated with the air spring air bag through a fifth electromagnetic valve, and the air inlet and the air outlet of the high-pressure air storage tank are communicated with an air outlet of the circulating air supplementing pipeline through a sixth electromagnetic valve; the low-pressure pipeline comprises a low-pressure air storage tank, an air inlet and an air outlet of the low-pressure air storage tank are communicated with the air spring air bag through a seventh electromagnetic valve, and the air inlet and the air outlet of the low-pressure air storage tank are communicated with an air inlet of the circulating air supplementing pipeline through an eighth electromagnetic valve. Compared with the prior art, the gas supply system has the advantages that the number of used electromagnetic valves is smaller, the pipeline structure is simpler, the cost is lower, and the maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to air suspension gas supply technology field, concretely relates to an air suspension closed gas supply system. BACKGROUND

[0002] The main components of the air suspension system are the adjustable air spring that provides elastic support for the vehicle body and the air supply device that provides compressed air; the two components are connected to each other through a pneumatic pipeline. The main function of the air suspension system is to actively adjust the height / level of the vehicle body relative to the axle. According to the requirements, the air spring is inflated or deflated by connecting a certain valve to adjust the height of the vehicle.

[0003] Patent application CN118700773A discloses a double-tank closed gas supply system for air suspension and a control method thereof, and specifically discloses that it adopts a double-tank design. In some working conditions, the suspension height adjustment does not require the intervention of the compressor C in the gas supply system, and the suspension height adjustment can be realized without the noise of the compressor operation. During vehicle driving, the low-pressure gas tank LAT and the high-pressure gas tank HAT are adjusted, and the compressed air in the low-pressure gas tank LAT is pumped into the high-pressure gas tank HAT by the compressor, so that the pressure of the gas tank LAT is restored to the set state or the pressure of the gas tank HAT is restored to the set state.

[0004] However, the pipeline structure of the above-mentioned patent application is complex, the cost is high, and it is not convenient to maintain; and in the external air supplementing working condition, it uses the compressor C to compress and discharge the external air into the low-pressure gas tank LAT, and then the low-pressure gas tank LAT is pumped into the high-pressure gas tank HAT. However, during the process of pumping the gas in the low-pressure gas tank to the high-pressure gas tank, excessive suction may occur, which may cause the low-pressure gas tank to be damaged due to vacuum. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an air suspension closed gas supply system to solve the problems of complex pipeline structure and high cost of the existing air suspension closed gas supply system.

[0006] To solve the above technical problems, the utility model provides an air suspension closed gas supply system, which comprises at least one air spring air bag and a gas supply circuit for inflating and deflating the air spring air bag; the gas supply circuit comprises a high-pressure pipeline, a low-pressure pipeline and a circulating air supplementing pipeline; wherein,

[0007] The high-pressure pipeline comprises a high-pressure gas tank, the gas inlet and outlet of the high-pressure gas tank are communicated with the air spring air bag through a fifth electromagnetic valve, and the gas inlet and outlet of the high-pressure gas tank are communicated with the gas outlet of the circulating air supplementing pipeline through a sixth electromagnetic valve;

[0008] The low-pressure pipeline comprises a low-pressure gas tank, the gas inlet and outlet of the low-pressure gas tank is communicated with the air spring air bag through a seventh electromagnetic valve, and the gas inlet and outlet of the low-pressure gas tank is communicated with the gas inlet of the circulating air supplement pipeline through an eighth electromagnetic valve.

[0009] Further, the low-pressure gas tank is provided with an air supplement port, and the air supplement port is communicated with the external atmosphere through a first one-way valve.

[0010] Further, the circulating air supplement pipeline comprises an air pump and a second one-way valve, the gas inlet of the air pump is communicated with the eighth electromagnetic valve, the gas outlet of the air pump is communicated with the gas inlet of the second one-way valve, and the gas outlet of the second one-way valve is communicated with the sixth electromagnetic valve.

[0011] Further, the gas inlet of the air pump is communicated with the external atmosphere through a third one-way valve, and the gas outlet of the air pump is communicated with the external atmosphere through a ninth electromagnetic valve.

[0012] Further, the gas inlet and outlet of the air pump are connected in parallel with a power limiting valve.

[0013] Further, an air dryer is connected between the air pump and the second one-way valve, and the gas inlet of the third one-way valve is connected with an air filter.

[0014] Further, the gas inlet of the first one-way valve is communicated with the air filter.

[0015] Further, the system further comprises an external air charging pipeline, the external air charging pipeline comprises an external air charging interface, a manual pressure limiting valve and a manual on-off valve which are sequentially connected in series, and the gas inlet end of the manual on-off valve is communicated with the gas inlet and outlet of the high-pressure gas tank.

[0016] Further, the system further comprises a cooling system for cooling the high-pressure gas tank, and the cooling system comprises a spiral water channel arranged along the tank wall of the high-pressure gas tank, and a cooler, a whole vehicle thermal management module, a water pump and a temperature control valve which are sequentially communicated are connected between the liquid outlet and the liquid inlet of the spiral water channel.

[0017] The beneficial effects of the utility model are as follows:

[0018] 1. By connecting the circulating air supplement pipeline between the high-pressure pipeline and the low-pressure pipeline, the high-pressure gas tank and the low-pressure gas tank can be controlled by two electromagnetic valves, compared with the prior art, the number of electromagnetic valves is smaller, the pipeline structure is simpler, the cost is lower, and the maintenance is facilitated.

[0019] 1. By connecting the circulating air supplement pipeline between the high-pressure pipeline and the low-pressure pipeline, the high-pressure gas tank and the low-pressure gas tank can be controlled by two electromagnetic valves, compared with the prior art, the number of electromagnetic valves is smaller, the pipeline structure is simpler, the cost is lower, and the maintenance is facilitated.

[0020] 2. By setting the first check valve, when the internal pressure of the low-pressure gas tank is less than or equal to atmospheric pressure, the first check valve is opened, the gas inlet of the low-pressure gas tank is connected with the outside atmosphere, so that the vacuum condition of the low-pressure gas tank caused by excessive gas suction during the process of pumping the gas of the low-pressure gas tank to the high-pressure gas tank can be avoided.

[0021] 3. By setting the external charging pipeline, the system can be used for outdoor air charging, and by setting the pressure-adjustable manual pressure-limiting valve, the highest pressure of the charging object can be adjusted and overpressure protection can be provided.

[0022] 4. By setting the cooling system to cool the high-pressure gas tank, the temperature rise of the high-pressure gas tank during the charging process can be reduced, the charging efficiency can be improved, the suspension charging and discharging time interval can be reduced, and by setting the temperature control valve, the cooling system can be closed when the gas temperature in the high-pressure gas tank is reduced, so as to reduce the load of the water pump. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. In the drawings, the same reference numerals are used to represent the same or similar parts. The schematic embodiments of the present application and the descriptions thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It is a structure schematic view of an embodiment of the present application.

[0025] Figure 2 It is an external structure schematic view of the high-pressure gas tank of an embodiment of the present application.

[0026] Wherein: 1a, left front air spring gas bag; 1b, right front air spring gas bag; 1c, left rear air spring gas bag; 1d, right rear air spring gas bag; 11a, first electromagnetic valve; 11b, second electromagnetic valve; 11c, third electromagnetic valve; 11d, fourth electromagnetic valve; 2, high-pressure gas tank; 201, gas inlet and outlet; 202, liquid inlet 202; 203, spiral water channel; 204, liquid outlet; 21, fifth electromagnetic valve; 22, first temperature and pressure sensor; 23, sixth electromagnetic valve; 3, low-pressure gas tank; 31, seventh electromagnetic valve; 32, second temperature and pressure sensor; 33, eighth electromagnetic valve; 34, first check valve; 4, gas pump; 41, power limiting valve; 42, air dryer; 43, second check valve; 5, ninth electromagnetic valve; 6, third check valve; 61, air filter; 7, manual on-off valve; 71, manual pressure-limiting valve; 8, cooler; 81, whole vehicle thermal management module; 82, water pump; 83, temperature control valve. DETAILED DESCRIPTION

[0027] The air suspension closed air supply system provided by the embodiment includes at least one air spring air bag and an air supply circuit for charging and discharging the air spring air bag. In an exemplary embodiment, as shown in Figure 1 four air spring air bags can be provided, and the four air spring air bags belong to four air suspensions respectively, i.e., a left front wheel air suspension, a right front wheel air suspension, a left rear wheel air suspension, and a right rear wheel air suspension. An air inlet and outlet pipe of each air spring air bag is connected with an air spring electromagnetic valve.

[0028] Specifically, the air supply circuit can include a high-pressure pipe, a low-pressure pipe, and a circulating air supplement pipe. The high-pressure pipe includes a high-pressure air tank 2. An air inlet and outlet port 201 of the high-pressure air tank 2 is in communication with the air spring electromagnetic valve through a fifth electromagnetic valve 21. The air inlet and outlet port 201 of the high-pressure air tank 2 is in communication with an air outlet of the circulating air supplement pipe through a sixth electromagnetic valve 23. The low-pressure pipe includes a low-pressure air tank 3. An air inlet and outlet port 201 of the low-pressure air tank 3 is in communication with each air spring electromagnetic valve through a seventh electromagnetic valve 31. The air inlet and outlet port 201 of the low-pressure air tank 3 is in communication with an air inlet of the circulating air supplement pipe through an eighth electromagnetic valve 33.

[0029] In an initial state, the high-pressure air tank 2 is inflated to a high-pressure state, and the inside of the low-pressure air tank 3 is the same as the atmospheric pressure. When the vehicle frame needs to be raised, the fifth electromagnetic valve 21 is powered on and opened, and the sixth electromagnetic valve 23 and the seventh electromagnetic valve 31 remain powered off and closed. A plurality of air spring air bags include a left front air spring air bag 1a, a right front air spring air bag 1b, a rear air spring air bag 1c, and a right rear air spring air bag 1d. A plurality of air spring electromagnetic valves include a first electromagnetic valve 11a, a second electromagnetic valve 11b, a third electromagnetic valve 11c, and a fourth electromagnetic valve 11d. When the first electromagnetic valve 11a and the second electromagnetic valve 11b are powered on and opened, high-pressure air in the high-pressure air tank 2 is communicated with the left front air spring air bag 1a and the right front air spring air bag 1b of the front suspension. High-pressure gas rushes into the front air suspension air spring due to the pressure difference, the front suspension is raised, and the vehicle head is lifted.

[0030] When it is detected that the suspension lifting height meets the requirements, the first electromagnetic valve 11a and the second electromagnetic valve 11b are closed to keep the suspension stable.

[0031] Similarly, when the rear suspension needs to be raised, the third electromagnetic valve 11c and the fourth electromagnetic valve 11d are opened, high-pressure air in the high-pressure air tank 2 is communicated with the rear air spring air bag 1c and the right rear air spring air bag 1d, and high-pressure gas rushes into the rear air suspension air spring due to the pressure difference.

[0032] When the front and rear suspensions need to be raised at the same time, the first solenoid valve 11a, the second solenoid valve 11b, the third solenoid valve 11c and the fourth solenoid valve 11d are powered on at the same time; the high-pressure air in the high-pressure gas tank 2 is communicated with the left front air spring bag 1a, the right front air spring bag 1b, the rear air spring bag 1c and the right rear air spring bag 1d, and the high-pressure gas rushes into the front and rear air spring bags due to the pressure difference. During this process, the air compressor does not work.

[0033] When the vehicle frame needs to be lowered, the seventh solenoid valve 31 is opened, and the fifth solenoid valve 21 and the eighth solenoid valve 33 are not powered and remain in a closed state to prevent the high-pressure gas tank 2 from entering the low-pressure gas tank 3. When the front suspension needs to be lowered, the first solenoid valve 11a and the second solenoid valve 11b are opened, and the pressure gas in the left front air spring bag 1a and the right front air spring bag 1b enters the low-pressure gas tank 3 due to the pressure difference, the gas in the air spring bag is reduced, and the front suspension is lowered. When the suspension detects that the suspension lowering height meets the requirements, the first solenoid valve 11a and the second solenoid valve 11b are closed to keep the suspension stable.

[0034] Similarly, when the rear suspension needs to be lowered, the third solenoid valve 11c and the fourth solenoid valve 11d are opened; when the front and rear suspensions need to be lowered at the same time, the first solenoid valve 11a, the second solenoid valve 11b, the third solenoid valve 11c and the fourth solenoid valve 11d are powered on at the same time. During this process, the air compressor does not work.

[0035] In the above process of raising and lowering the vehicle frame, the air spring bag charging and discharging process corresponding to the suspension raising or lowering is completed by the gas pressure difference between the air spring bag and the low-pressure gas tank 3, without starting the air pump 4, reducing the air pump motor working frequency in the suspension charging and discharging process, prolonging the air pump motor working life, and reducing the noise of the air pump motor working process on the driver. And, the air supply circuit directly connects the circulating air supply pipeline between the high-pressure pipeline and the low-pressure pipeline, and the high-pressure gas tank 2 and the low-pressure gas tank 3 can be controlled by two solenoid valves, compared with the prior art, the number of solenoid valves is smaller, the pipeline structure is simpler, the cost is lower, and the maintenance is more convenient.

[0036] According to one embodiment of the present application, the circulating air supply pipeline comprises the air pump 4 and the second one-way valve 43, the air inlet of the air pump 4 is communicated with the eighth electromagnetic valve 33, the air outlet of the air pump 4 is communicated with the air inlet of the second one-way valve 43, and the air outlet of the second one-way valve 43 is communicated with the sixth electromagnetic valve 23. After the air suspension completes one lifting and lowering, the high-pressure air tank 2 discharges air to the air spring once due to the lifting of the air spring, the internal mass decreases, and the pressure decreases; the low-pressure air tank 3 is inflated once by the air in the air spring due to the lowering of the air spring, the internal mass increases, and the pressure increases; therefore, in order to enable the air suspension to perform the next inflation and deflation, the embodiment of the present application circulates the air in the low-pressure air tank 3 to the high-pressure air tank 2 by the air pump 4 to supplement air, and returns to the initial state to be ready for the next inflation and deflation of the air suspension.

[0037] During the circulating air supply process, the sixth electromagnetic valve 23 and the eighth electromagnetic valve 33 need to be opened, and the remaining electromagnetic valves remain in the closed state, and at the same time, the air pump motor is started to drive the piston to reciprocate, so that the air in the low-pressure air tank 3 is supplied into the high-pressure air tank 2 through the eighth electromagnetic valve 33, the air pump 4, the air dryer 42, the second one-way valve 43 and the sixth electromagnetic valve 23. When it is detected that the pressure of the low-pressure air tank 3 is atmospheric pressure, the air discharge process of the low-pressure air tank 3 is completed, and the eighth electromagnetic valve 33 is closed. If the suspension needs to be lifted during this process, the fifth electromagnetic valve 21 and the electromagnetic valves for controlling the inflation and deflation of the corresponding air spring are opened, and the suspension is lifted correspondingly; if the suspension needs to be lowered during this process, the seventh electromagnetic valve 31 and the electromagnetic valves for controlling the inflation and deflation of the corresponding air spring are opened, and the suspension is lowered correspondingly.

[0038] In one possible implementation, the low-pressure air tank 3 is provided with an air supply port, and the air supply port is communicated with the external atmosphere through the first one-way valve 34. The first one-way valve 34 is opened when the internal pressure of the low-pressure air tank 3 is less than or equal to atmospheric pressure, so that the low-pressure air tank 3 is communicated with the external atmosphere, thereby avoiding the vacuum condition of the low-pressure air tank 3 due to excessive air suction during the process of pumping the air in the low-pressure air tank 3 to the high-pressure air tank 2.

[0039] According to one embodiment of the present application, the air inlet of the air pump 4 is communicated with the external atmosphere through the third one-way valve 6, and the air outlet of the air pump 4 is communicated with the external atmosphere through the ninth electromagnetic valve 5. During the working process of the air suspension, the air bag is continuously inflated and deflated, and there is a small amount of air leakage. As the time accumulates, the air mass in the closed air suspension air supply system is insufficient, and therefore, the third one-way valve 6 which is communicated with the external atmosphere is arranged in the embodiment, so that air can be supplemented from the atmosphere environment through the third one-way valve 6 as needed.

[0040] In the process of supplementing air to the high-pressure gas tank 2, if the pressure of the high-pressure gas tank 2 does not reach the target value after internal circulation supplementing, the air pump 4 is used to suck air from the atmosphere through the second air filter and the third one-way valve 6, and then the air enters the high-pressure gas tank 2 through the second air filter, the second one-way valve 43 and the sixth electromagnetic valve 23 for air supplementing; if the pressure of the high-pressure gas tank 2 has reached the target value before, but the pressure of the low-pressure gas tank 3 has not reached the atmospheric pressure, the sixth electromagnetic valve 23 is closed and the ninth electromagnetic valve 5 is opened, and the gas in the low-pressure gas tank 3 is discharged to the atmosphere outside the system through the ninth electromagnetic valve 5; when it is detected that the pressure of the low-pressure gas tank 3 is as low as the atmospheric pressure and the pressure of the high-pressure gas tank 2 reaches the target atmospheric pressure, the air charging process of the high-pressure gas tank 2 is completed, the sixth electromagnetic valve 23 is closed, and the air pump motor stops running.

[0041] According to one embodiment of the present application, the air inlet and outlet 201 of the high-pressure gas tank 2 is provided with a first pressure sensor for detecting the gas pressure in the high-pressure gas tank 2; the air inlet and outlet 201 of the low-pressure gas tank 3 is provided with a second pressure sensor for detecting the gas pressure in the low-pressure gas tank 3. By providing the first pressure sensor and the second pressure sensor, the charging and discharging pressures of the high and low pressure tanks can be detected in real time, which is beneficial to realize automatic control. The first pressure sensor and the second pressure sensor can adopt temperature-integrated pressure sensors 22 / 32 to facilitate the detection of the charging and discharging temperature of the high and low pressure tanks.

[0042] According to one embodiment of the present application, a power limiting valve 41 is connected in parallel between the inlet and outlet of the air pump 4. In order to protect the high-pressure gas tank 2 and avoid the risk of explosion caused by the internal pressure of the high-pressure gas tank 2 being higher than the safe pressure of the high-pressure gas tank 2 during continuous air charging of the high-pressure gas tank 2, the embodiment provides the power limiting valve 41, when the internal pressure of the high-pressure gas tank 2 exceeds the opening pressure of the power limiting valve 41, the air pump 4 exhaust port and the air pump 4 suction port are the same, and the internal gas pressure of the gas tank no longer rises.

[0043] According to one embodiment of the present application, an air dryer 42 is connected between the air pump 4 and the second one-way valve 43, and an air filter 61 is connected to the air inlet of the third one-way valve 6. By providing the air dryer 42, the gas entering the high-pressure gas tank 2 from the low-pressure gas tank 3 can be dried; by providing the air filter 61, the gas charged into the high-pressure gas tank 2 from the outside can be dried and filtered. The air dryer 42 and the air filter 61 not only can slow down the corrosion of the equipment and protect the pipeline equipment, but also can improve the stability of the gas pressure.

[0044] According to one embodiment of the present application, the air inlet of the first one-way valve 34 communicates with the air filter 61. The first one-way valve 34 and the air filter 61 in this embodiment can filter the gas entering the low-pressure gas tank 3, ensuring the air quality of the air entering the system.

[0045] According to one embodiment of the present application, the system further comprises an external inflation pipeline, which comprises a manual on-off valve 7 in communication with the gas inlet and outlet 201 of the high-pressure gas tank 2, and the manual on-off valve 7 is externally inflated by a pressure-adjustable manual pressure-limiting valve 71. The gas outlet of the manual pressure-limiting valve 71 is provided with an external inflation interface, which can facilitate the external inflation of the system (such as inflating a camping air mattress or a tire, etc.) outdoors. By setting the manual on-off valve 7, it can be selected whether to deflate externally, and by setting the pressure-adjustable manual pressure-limiting valve 71, the maximum pressure of the inflated object can be adjusted and overpressure protection can be provided.

[0046] When inflating externally, the manual on-off valve 7 is opened, and the high-pressure gas tank 2 can supply gas externally through the manual on-off valve 7 and the manual pressure-limiting valve 71. The pressure-adjustable manual pressure-limiting valve 71 is in communication with the high-pressure gas tank 2 and the inflated object under the action of the spring force. When the internal gas pressure of the inflated object reaches the threshold set by the spring force of the manual pressure-limiting valve 71, the gas pressure acting on the manual pressure-limiting valve 71 will overcome the spring force to push the manual pressure-limiting valve 71 to move, thereby closing the gas path and protecting the inflated object.

[0047] When the inflated object requires a higher pressure, the plug can be tightened by rotating the knob to compress the spring and increase the spring pre-tightening force. In this way, the internal gas pressure of the inflated object needs to be greater to push the manual pressure-limiting valve 71 to move and close the gas path to end the inflation, so as to meet the requirement of high pressure of the inflated object. For an object with unknown inflation pressure, the manual on-off valve 7 can be closed after the desired effect is achieved, and the inflation can also be ended.

[0048] Due to the limited gas storage capacity of the high-pressure gas tank 2, for a large-volume inflated object, after the manual on-off valve 7 is opened, the vehicle can be powered to select the "ambient air supplementing mode" to operate, and the sixth solenoid valve 23 is opened. The air pump motor is started to work to drive the air pump 4 to achieve the purpose of externally inflating the large-volume object.

[0049] According to one embodiment of the present application, the system further comprises a cooling system for cooling the high-pressure gas tank 2. As shown in Figure 2 The cooling system comprises a spiral water channel 203 arranged along the tank wall of the high-pressure gas tank 2. The liquid outlet 204 of the spiral water channel 203 is in communication with the liquid inlet of the vehicle thermal management module 81. The liquid outlet 204 of the vehicle thermal management module 81 is in communication with the liquid inlet 202 of the spiral water channel 203 through a water pump 82 and a temperature control valve 83 connected in sequence. A cooler 8 is connected between the liquid outlet of the spiral water channel 203 and the liquid inlet of the vehicle thermal management module 81.

[0050] The embodiment can reduce the temperature rise of the high-pressure gas tank 2 during the inflation process, improve the inflation efficiency, reduce the time interval of the suspension inflation and deflation, and reduce the working time of the air pump motor. By arranging the cooler 8 between the liquid outlet of the spiral water channel 203 and the liquid inlet of the vehicle thermal management module 81, the high-pressure gas tank can be cooled when the vehicle thermal management module 81 is not working.

[0051] When the high-pressure gas tank 2 is inflated, the temperature control valve 83 is opened, and the circulating cooling liquid of the thermal management module enters the surface of the gas tank to quickly remove the heat generated during the inflation process. In order to reduce the influence of the air pump 4 on the NVH of the driver and passenger during the inflation process, it is hoped that the inflation process is short, and the inflation efficiency can be improved by increasing the speed of the air pump 4 and the displacement of the air pump 4. At the same time, it is necessary to avoid the huge temperature rise caused by the rapid inflation and high pressure in the closed gas tank. The high-pressure gas tank 2 with the spiral water channel 203 can quickly remove the heat generated by the inflation and pressure increase of the gas tank in a short time through forced convection and heat exchange between the circulating cooling liquid and the gas tank, thereby improving the inflation efficiency and reducing the damage of high-temperature gas to the system.

[0052] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced without departing from the spirit and scope of the present application. The modifications and replacements should be included in the scope of the claims of the present application.

Claims

1. A closed-loop air supply system for air suspension, characterized in that, It includes at least one air spring bladder and an air supply circuit for inflating and deflating the air spring bladder; the air supply circuit includes a high-pressure line, a low-pressure line, and a recirculation air supply line; wherein, The high-pressure pipeline includes a high-pressure gas storage tank. The inlet and outlet of the high-pressure gas storage tank are connected to the air spring airbag through a fifth solenoid valve. The inlet and outlet of the high-pressure gas storage tank are connected to the outlet of the circulating gas supply pipeline through a sixth solenoid valve. The low-pressure pipeline includes a low-pressure gas storage tank. The inlet and outlet of the low-pressure gas storage tank are connected to the air spring bladder through a seventh solenoid valve. The inlet and outlet of the low-pressure gas storage tank are connected to the inlet of the circulating gas supply pipeline through an eighth solenoid valve.

2. The air suspension closed-loop air supply system according to claim 1, characterized in that, The low-pressure gas storage tank is equipped with a gas replenishment port, which is connected to the outside atmosphere through a first one-way valve.

3. The air suspension closed-loop air supply system according to claim 2, characterized in that, The circulating air supply pipeline includes an air pump and a second one-way valve. The air inlet of the air pump is connected to an eighth solenoid valve, the air outlet of the air pump is connected to the air inlet of the second one-way valve, and the air outlet of the second one-way valve is connected to a sixth solenoid valve.

4. The air suspension closed-loop air supply system according to claim 3, characterized in that, The air pump's inlet is connected to the outside atmosphere via a third one-way valve; the air pump's outlet is connected to the outside atmosphere via a ninth solenoid valve.

5. The air suspension closed-loop air supply system according to claim 4, characterized in that, The high-pressure gas storage tank is equipped with a first pressure sensor at its inlet and outlet for detecting the gas pressure inside the high-pressure gas storage tank; the low-pressure gas storage tank is equipped with a second pressure sensor at its inlet and outlet for detecting the gas pressure inside the low-pressure gas storage tank.

6. The air suspension closed-loop air supply system according to claim 4, characterized in that, A power limiting valve is connected in parallel between the inlet and outlet of the air pump.

7. The air suspension closed-loop air supply system according to claim 4, characterized in that, An air dryer is connected between the air pump and the second one-way valve, and an air filter is connected to the air inlet of the third one-way valve.

8. The air suspension closed-loop air supply system according to claim 7, characterized in that, The air inlet of the first one-way valve is connected to the air filter.

9. The air suspension closed-loop air supply system according to claim 1, characterized in that, The system also includes an external inflation pipeline, which includes an external inflation port, a manual pressure relief valve, and a manual switching valve connected in series. The inlet of the manual switching valve is connected to the inlet and outlet of the high-pressure gas storage tank.

10. The air suspension closed-loop air supply system according to claim 1, characterized in that, The system also includes a cooling system for cooling the high-pressure gas storage tank; the cooling system includes a spiral water channel arranged along the tank wall of the high-pressure gas storage tank, and a cooler, a vehicle thermal management module, a water pump and a temperature control valve are connected in sequence between the liquid outlet and the liquid inlet of the spiral water channel.

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