Air compression device and suspension system

Abstract

The utility model discloses an air compression device. An air compression unit comprises a crankcase and an air compression assembly arranged in the crankcase. The first function module comprises a shell installed on one side of the crankcase, a motor and an air dryer, the motor and the air dryer are arranged in the shell, an air inlet hole is formed in the shell, the motor drives an air compression assembly to compress air, and compressed air in the crankcase is dried through the air dryer; the second function module is installed on one side of the first function module and comprises a valve assembly and an electric control board arranged on one side of the valve assembly, the second function module and the first function module are both installed on the same side of the crankcase, the motor and the valve assembly are both electrically connected with the electric control board, and the integration level of the device is improved. The air compressor comprises the two-stage air compression device, air supply of high-pressure air in the air storage tank to the two-stage air compression device is achieved through the gain air path, and the air compression efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air compression, in particular to an air compression device and a suspension system. Background Art

[0002] The air suspension system can control the air compressor and exhaust valve according to different road conditions and the signal of the distance sensor to automatically compress or extend the spring, thereby lowering or raising the ground clearance of the chassis to increase the stability of the high-speed vehicle body or the passability of complex road conditions. As the core component of the air suspension system, the air compression device can compress the air and inflate it into the air spring. The existing air compression device known from the document US5600953A or EP1233183B1 mainly includes an air compressor, a valve, an air dryer, an electric control board and a motor. It usually has the following defects:

[0003] On the one hand, the various components of the air compression device are mostly connected together in an independent manner, resulting in low installation efficiency, low integration, unreasonable space utilization, and failure to meet the demand for lightweight;

[0004] On the other hand, most air compression devices used in motor vehicle suspension systems use a single-stage compression method. Although this type of compressor has a large output gas volume, the output gas pressure is relatively low, resulting in low adjustment sensitivity of the automobile air suspension system. Although some air compression devices in the prior art use a multi-stage compression method, the initial compressed air pressure is not high, making the overall air compression efficiency low. Utility Model Content

[0005] To this end, the utility model provides an air compression device and a suspension system to solve the above-mentioned defects in the prior art.

[0006] An air compression device, comprising:

[0007] An air compression unit, comprising a crankcase and an air compression assembly disposed inside the crankcase;

[0008] A first functional module includes a housing mounted on one side of the crankcase, a motor and an air dryer arranged inside the housing, an air inlet hole being provided on the housing, the motor driving the air compression assembly to compress air, and the compressed gas in the crankcase being dried by the air dryer;

[0009] The second functional module is installed on one side of the first functional module, and includes a valve assembly and an electric control board arranged on one side of the valve assembly. The second functional module and the first functional module are both installed on the same side of the crankcase, and the motor and the valve assembly are both electrically connected to the electric control board.

[0010] Preferably, the second functional module is detachably mounted on the first functional module.

[0011] Preferably, the valve assemblies are arranged side by side on one side of the first functional module, and the electric control board extends to one side of the housing.

[0012] Preferably, a mounting block is protrudingly provided on one side of the crankcase, the air inlet end of the air dryer is connected to the mounting end of the mounting block, an air circuit A is provided in the crankcase shell and the mounting block, the air circuit A is used to connect the exhaust port of the air compression unit and the air inlet end of the air dryer, an air circuit B is provided in the shell, and the two ends of the air circuit B are respectively connected to the air dryer and the valve assembly.

[0013] Preferably, the valve assembly includes a mounting seat, an intake air circuit constructed inside the mounting seat, multiple A solenoid valves and at least one B solenoid valve, the mounting seat has useful air circuits constructed inside corresponding to the positions of the A solenoid valves, and the mounting seat has an exhaust air circuit 1 constructed inside corresponding to the positions of the B solenoid valves, and the useful air circuit and the exhaust air circuit 1 are both connected to the intake air circuit.

[0014] Preferably, the valve assembly also includes a pneumatic safety valve, the intake air circuit is connected to the pneumatic safety valve through exhaust air circuit 2, the pneumatic safety valve can adjust the intake air circuit pressure by opening and closing the exhaust air circuit 2, the B solenoid valve is a two-position three-way valve, the B solenoid valve and the pneumatic safety valve are connected through exhaust air circuit 3, the B solenoid valve is used to switch the exhaust air circuit 1 to be connected to the intake air circuit or the intake air circuit to be connected to the exhaust air circuit 3.

[0015] Preferably, a pressure sensor is further included. The pressure sensor can be arranged on the valve assembly. The pressure sensor is used to measure the pressure of the air after being dried by the air dryer. The pressure sensor is electrically connected to the electric control board.

[0016] Preferably, the air compression component is a two-stage crank-connecting rod piston group arranged inside the crankcase and driven by an electric motor, the two-stage crank-connecting rod piston group is constructed with a primary compression chamber and a secondary compression chamber inside the crankcase, the two-stage crank-connecting rod piston group is used to pump the gas compressed by the primary compression chamber into the secondary compression chamber for further compression, the intake end of the primary compression chamber is provided with a primary one-way intake valve, the exhaust end of the primary compression chamber is provided with a primary one-way exhaust valve, the primary compression chamber and the secondary compression chamber are connected by a compressed gas medium channel, the intake end of the secondary compression chamber is provided with a secondary one-way intake valve, and the exhaust end of the secondary compression chamber is provided with a secondary one-way exhaust valve.

[0017] A suspension system, comprising an air compression device, an air spring and an air storage tank, wherein the air compression device is one of the above-mentioned air compression devices, an air intake path is sequentially connected to the primary compression chamber, the secondary compression chamber, an air dryer and a plurality of air springs, the air intake path located downstream of the air dryer is connected to an exhaust gas path 1 and the air storage tank, and the air storage tank is also connected to the primary compression chamber or the secondary compression chamber via a gain gas path;

[0018] The valve assembly is used to realize the opening and closing of the air path between the air compression unit, the air storage tank and the air spring.

[0019] Preferably, the exhaust end of the gain gas circuit is connected to the first-stage compression chamber, the exhaust branch of the gain gas circuit is connected to the crankcase communicated with the motor, and a pressure relief valve is provided on the gain gas circuit between the crankcase and the first-stage compression chamber.

[0020] The utility model has the following advantages:

[0021] (1) The utility model integrates the components of the air compression device on a detachably connected first functional module and a second functional module, and installs them on the same side of the air compression unit. On the one hand, due to the close fit between the modules and the compact layout, the integration of the device is improved; on the other hand, the layout of the gas pipeline and the circuit can be simplified, which is conducive to the lightweight demand of the device and is also more conducive to assembly and subsequent operation and maintenance;

[0022] (2) The utility model suspension system adds a gain air circuit on the basis of two-stage gas compression, so that the high-pressure gas in the gas storage tank can be supplied to the two compression chambers of the air compression device, thereby improving the efficiency of air compression, saving air compression and inflation time, and improving the adjustment sensitivity of the suspension system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a perspective view of the air compression device of the utility model;

[0024] Figure 2 A schematic diagram of the crankcase and the gas path in the shell of an embodiment of the utility model;

[0025] Figure 3 It is a partial cross-sectional structural schematic diagram of the air compression unit of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the first functional module housing of the utility model integrating the motor and the air dryer housing;

[0027] Figure 5 It is a schematic diagram of the air circuit of the suspension system of the utility model;

[0028] Figure 6It is a schematic diagram of the gas circuit of the utility model in the inflated state;

[0029] Figure 7 It is a schematic diagram of the gas path of the utility model in the exhaust state;

[0030] Figure 8 It is a schematic diagram of the gas circuit of the utility model in the gain inflation state 1;

[0031] Fig. 9 It is a schematic diagram of the second gas path in the gain inflation state of the utility model;

[0032] Fig.10 It is a schematic diagram of the gas circuit of the gain inflation state three of the utility model.

[0033] In the figure:

[0034] 100-air compression device; 110-first functional module; 120-housing; 122-end cover; 130-motor; 140-second functional module; 150-air dryer; 160-crankcase; 161-mounting block; 180-electric control board; 181-controller connection port; 190-valve assembly; 191-air path connection port; 194-air inlet;

[0035] 210-first-stage one-way intake valve; 220-first-stage connecting rod; 230-second-stage connecting rod; 240-second-stage piston; 260-first-stage one-way exhaust valve; 270-compressed gas medium channel; 280-crank; 290-first-stage piston;

[0036] 340-first stage compression chamber; 320-second stage one-way air inlet valve; 330-second stage one-way exhaust valve; 342-second stage compression chamber; 350-pneumatic safety valve; 360-B solenoid valve; 370-pressure sensor; 380-gas storage tank; 390-A solenoid valve;

[0037] 400-air spring; 820-pressure relief valve; 10-intake air circuit; 20-exhaust air circuit 1; 30-gain air circuit; 40-use air circuit; 50-exhaust air circuit 2; 60-exhaust air circuit 3; 70-air circuit A; 80-air circuit B; DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0039] The embodiments of the utility model are mainly aimed at improving the air compression device and the air suspension system on the motor vehicle, so as to improve the integration of the air compression device and the efficiency of air compression.

[0040] like Figure 1-10As shown, the utility model provides an air compression device, including an air compression unit, a first functional module 110 and a second functional module 140 .

[0041] The air compression unit is used to compress air, and includes a crankcase 160 and an air compression component disposed inside the crankcase 160 .

[0042] The first functional module 110 includes a housing 120 installed on one side of the crankcase 160, a motor 130 and an air dryer 150 arranged inside the housing 120, and an air inlet 194 is provided on the housing 120. Preferably, the air inlet 194 is provided on an end cover 122 of the housing 120 away from the crankcase 160. In this way, when the air compression unit takes in air, it can take away part of the heat on the surface of the motor 130.

[0043] The housing 120 can protect the motor 130 and the air dryer 150 from external collisions, and can also prevent dust from entering the motor 130 and the air dryer 150 .

[0044] The motor 130 drives the air compression assembly to compress the air. The motor can be configured in different types according to specific usage. The motor in the embodiment of the utility model is preferably a brushless motor.

[0045] The compressed gas in the crankcase 160 is dried by the air dryer 150 .

[0046] In the embodiment of the utility model, the housing 120 of the first functional module 110 is integrally formed with the housing of the motor 130 and the housing of the air dryer 150. During installation, the rotor assembly of the motor 130 is mounted on the crankcase 160 and connected to the air compression assembly, the stator assembly of the motor 130 is mounted in the housing of the motor 130, the molecular sieve is installed in the housing of the air dryer 150, and then the housing 120 is fixedly connected with the crankcase 160 by screws.

[0047] Among them, the second functional module 140 is installed on one side of the first functional module 110, which includes a valve assembly 190 and an electronic control board 180 arranged on one side of the valve assembly 190. The second functional module 140 and the first functional module 110 are both installed on the same side of the crankcase 160, and the motor 130 and the valve assembly 190 are both electrically connected to the electronic control board 180.

[0048] The surface of the valve assembly 190 is provided with a plurality of air circuit connection ports 191, and the surface of the electric control board 180 is provided with a controller connection port 181. The air circuit connection port 191 can be connected to the air tank 380 and a plurality of air springs 400 of the suspension system.

[0049] In the embodiment of the utility model, the valve assembly 190 is arranged side by side on one side of the first functional module 110, and the electric control board 180 extends to one side of the housing 120. This layout is conducive to shortening the wiring distance between the electric control board 180 and each connecting component.

[0050] The second functional module 140 is detachably mounted on the first functional module 110. The two can be positioned and fixed by screws (not shown in the figure). When connecting, the corresponding gas paths must be accurately connected and the airtightness of the connection parts must be ensured.

[0051] Preferably, a mounting block 161 is protrudingly provided on one side of the crankcase 160, and the mounting block 161 and the crankcase 160 are integrally formed, and the air inlet end of the air dryer 150 is connected to the mounting end of the mounting block 161, and an air circuit A70 is provided in the case shell of the crankcase 160 and the mounting block 161, and the air circuit A70 is used to connect the exhaust port of the air compression unit and the air inlet end of the air dryer 150, and an air circuit B80 is provided in the shell 120, and the two ends of the air circuit B80 are respectively connected to the air dryer 150 and the valve assembly 190. This layout can improve the integration degree of the air compression device, facilitate the installation between components, and optimize the air circuit layout. In addition, the air circuit of the utility model is mostly arranged in the shell wall, which can effectively shorten the air circuit.

[0052] The connecting end between the gas circuit B80 and the gas circuit of the valve assembly 190 is provided with a seal (not shown in the figure) to improve the sealing performance of the gas circuit.

[0053] In the embodiment of the utility model, the air compression assembly is a two-stage crank connecting rod piston group arranged inside the crankcase 160 and driven by the motor 130. The two-stage crank connecting rod piston group is configured with a primary compression chamber 340 and a secondary compression chamber 342 inside the crankcase 160. The two-stage crank connecting rod piston group is used to pump the gas compressed by the primary compression chamber 340 into the secondary compression chamber 342 for further compression. Specifically:

[0054] The double-stage crank-connecting rod piston group includes a crank 280 connected to the driving shaft of the motor 130, and a primary connecting rod 220 and a secondary connecting rod 230 are respectively mounted on the crank 280 through bearings. The distal end of the primary connecting rod 220 is connected to a primary piston 290 that can reciprocate along the primary compression chamber 340, and the distal end of the secondary connecting rod 230 is connected to a secondary piston 240 that can reciprocate along the secondary compression chamber 342.

[0055] Since both the primary connecting rod 220 and the secondary connecting rod 230 are mounted on the crank 280, the compressor operates smoothly, and also has smaller torque fluctuation and smaller starting torque.

[0056] The diameter of the primary piston 290 is larger than that of the secondary piston 240. This is because the gas pressure increases from the low pressure stage to the high pressure stage during the compression from the primary stage to the secondary stage, and the piston diameter gradually decreases, so that the gas pressure acting on the larger piston area of ​​the low pressure stage is small, while the higher gas pressure acts on the smaller piston area of ​​the high pressure stage, so that the operation of the entire air compression unit can be more stable.

[0057] The inlet end of the first compression chamber 340 is provided with a first one-way inlet valve 210, the exhaust end of the first compression chamber 340 is provided with a first one-way exhaust valve 260, the first compression chamber 340 and the second compression chamber 342 are connected via a compressed gas medium channel 270, the inlet end of the second compression chamber 342 is provided with a second one-way inlet valve 320, and the exhaust end of the second compression chamber 342 is provided with a second one-way exhaust valve 330. The first one-way inlet valve 210, the first one-way exhaust valve 260, the second one-way inlet valve 320 and the second one-way exhaust valve 330 are provided in sequence to control the one-way flow of gas and prevent gas backflow.

[0058] It should be noted that atmospheric gas enters the housing 120 through the air inlet hole 194, and enters the crankcase 160 between the primary piston 290 and the secondary piston 240, and enters the primary compression chamber 340 through the primary one-way intake valve 210, and enters the secondary compression chamber 342 from the primary one-way exhaust valve 260 through the compressed gas medium channel 270 from the secondary one-way intake valve 320, and is finally discharged through the secondary one-way exhaust valve 330.

[0059] In an embodiment of the utility model, the valve assembly 190 includes a mounting seat, an intake air circuit 10 constructed inside the mounting seat, a plurality of A solenoid valves 390 and at least one B solenoid valve 360, and the interior of the mounting seat is respectively configured with an air circuit 40 corresponding to the position of the A solenoid valve 390, and the interior of the mounting seat is configured with an exhaust air circuit 20 corresponding to the position of the B solenoid valve 360, and the air circuit 40 and the exhaust air circuit 20 are both connected to the intake air circuit 10.

[0060] Furthermore, the valve assembly 190 also includes a pneumatic safety valve 350, and the intake air circuit 10 is connected to the pneumatic safety valve 350 through the exhaust air circuit 2 50. The pneumatic safety valve 350 can adjust the air pressure of the intake air circuit 10 by opening and closing the exhaust air circuit 2 50. The B solenoid valve 360 ​​is a two-position three-way valve, and the B solenoid valve 360 ​​is connected to the pneumatic safety valve 350 through the exhaust air circuit 3 60. The B solenoid valve 360 ​​is used to switch the exhaust air circuit 1 20 to be connected to the intake air circuit 10 or the intake air circuit 10 to be connected to the exhaust air circuit 3 60.

[0061] In an embodiment of the utility model, the air compression device also includes a pressure sensor 370, which can be arranged on the valve assembly 190. The pressure sensor 370 is used to measure the pressure of the air after being dried by the air dryer 150. The pressure sensor 370 is electrically connected to the electrical control board 180.

[0062] The utility model also provides a suspension system, including an air compression device 100, an air spring 400 and an air storage tank 380, wherein the air compression device 100 is a two-stage air compression device, wherein an air intake path 10 is sequentially connected to the primary compression chamber 340, the secondary compression chamber 342, an air dryer 150 and a plurality of air springs 400, and the air intake path 10 located downstream of the air dryer 150 is connected to an exhaust gas path 20 and the air storage tank 380, and the air storage tank 380 is also connected to the primary compression chamber 340 or the secondary compression chamber 342 via a gain gas path 30;

[0063] The valve assembly 190 is used to realize the air path opening and closing between the air compression unit, the air storage tank 380 and the air spring 400. Specifically:

[0064] The A solenoid valve 390 can control the opening and closing of the corresponding gas supply circuit 40 and the gain circuit 30 respectively. The gas supply circuit 40 is connected to the corresponding air spring 400 and the air storage tank 380 respectively.

[0065] like Fig. 9 As shown, in one embodiment of the present invention: the exhaust end of the gain gas path 30 is connected to enter the first-stage compression chamber 340. Specifically: the exhaust end of the gain gas path 30 is connected to the intake gas path 10 before the first-stage one-way intake valve 210.

[0066] like Fig.10 As shown, further, in this embodiment, if the pressure of the gain gas circuit 30 is higher than the set pressure or the predetermined pressure, part of the gas delivered by the gas storage tank 380 is discharged to the substantially center through the pressure relief valve 820. Specifically:

[0067] The exhaust branch of the gain gas circuit 30 is connected to the crankcase 160 which is in communication with the motor 130 , and a pressure relief valve 820 is provided on the gain gas circuit 30 between the crankcase 160 and the first-stage compression chamber 340 .

[0068] like Figure 8 As shown, in another embodiment of the present invention, the exhaust end of the gain gas circuit 30 is connected to enter the secondary compression chamber 342. Specifically: the exhaust end of the gain gas circuit 30 is connected to the intake gas circuit 10 between the primary one-way exhaust valve 260 and the secondary one-way intake valve 320.

[0069] The suspension system embodiment of the utility model includes the following air circuit states:

[0070] 1. Inflation status:

[0071] like Figure 6 As shown, the thick line with arrows highlights the schematic diagram of the air path in the inflated state. The motor 130 drives the air compression component to work, so that the gas enters the first-stage compression chamber 340 from the atmosphere to complete the first-stage compression. The compressed air enters the second-stage compression chamber 342 for further compression. The two-stage compression method can output high-pressure gas, which is applied to the suspension system, improving the efficiency of air compression, saving working time, and improving the adjustment sensitivity of the automobile air suspension system. The above-mentioned gas after the second-stage compression is dried by the air dryer 150 and then reaches the corresponding air spring 400 or the air storage tank 380 after passing through the pressure sensor 370 and the A solenoid valve 390 opened on the valve assembly 190;

[0072] 2. Exhaust status:

[0073] like Figure 7 As shown, the gas starts from the gas tank 380 or an air spring 400, passes through the corresponding A solenoid valve 390 and the pressure sensor 370, and then energizes the B solenoid valve 360, so that the intake air path 10 and the exhaust air path 360 are connected to each other, which further prompts the pneumatic safety valve 350 to open, so that the gas dried by the air dryer 150 is discharged to the atmosphere from the opened pneumatic safety valve 350.

[0074] When the B solenoid valve 360 ​​is powered off, the exhaust gas line 360 ​​and the exhaust gas line 120 are connected to each other, and the high-pressure gas remaining in the pneumatic safety valve 350 can be discharged into the atmosphere through the exhaust gas line 120;

[0075] 3. Gain inflation state 1:

[0076] like Figure 8 As shown, in the inflated state, further, the gas in the gas storage tank 380 enters the secondary compression chamber 342 through the gain gas path 30 to promote the air compression process. Since the gas pressure in the gas storage tank 380 is relatively high, the secondary compression chamber 342 produces gas with a higher pressure value, thereby improving the efficiency of air compression;

[0077] 4. Gain inflation state 2:

[0078] like Fig. 9 As shown, in the inflated state, further, the gas in the gas storage tank 380 enters the primary compression chamber 340 through the gain gas path 30 to promote the air compression process. Since the gas pressure in the gas storage tank 380 is relatively high, the primary compression chamber 340 produces gas with a higher pressure value, thereby improving the efficiency of air compression;

[0079] 5. Gain inflation state three:

[0080] like Fig.10 As shown, in Fig. 9 On the basis of the second gain charging state, when the gas pressure of the gain gas path 30 exceeds the limit value, the pressure relief valve 820 is opened to release the pressure. Finally, the pressure in the crankcase 160 connected to the gain gas path 30 and the first-stage compression chamber 340 is kept consistent. The advantage of this method is that the first-stage piston 290 can be in a state close to "no work", which is similar to the gas directly entering the second-stage compression chamber 342 to do work, which can effectively save power consumption.

[0081] In summary, the utility model integrates the components of the air compression device on the detachably connected first functional module and the second functional module, and installs them on the same side of the air compression unit. On the one hand, due to the close cooperation between the modules and the compact layout, the integration of the device is improved; on the other hand, the layout of the gas pipeline and the circuit can be simplified, which is conducive to the lightweight demand of the device and is also more conducive to assembly and later operation and maintenance;

[0082] The utility model suspension system is provided with a gain gas circuit on the basis of two-stage gas compression, so that the high-pressure gas in the gas storage tank can be supplied to the two compression chambers of the air compression device, thereby improving the efficiency of air compression, saving air compression and inflation time, and improving the adjustment sensitivity of the suspension system.

[0083] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. An air compression device, characterized in that: include An air compression unit comprising a crankcase (160) and an air compression component arranged inside the crankcase (160); A first functional module (110) includes a housing (120) mounted on one side of the crankcase (160) and a motor (130) and an air dryer (150) disposed inside the housing (120); an air inlet (194) is provided on the housing (120); the motor (130) drives the air compression assembly to compress air; and the compressed gas in the crankcase (160) is dried by passing through the air dryer (150); The second functional module (140) is installed on one side of the first functional module (110), and comprises a valve assembly (190) and an electric control board (180) arranged on one side of the valve assembly (190); the second functional module (140) and the first functional module (110) are both installed on the same side of the crankcase (160); and the motor (130) and the valve assembly (190) are both electrically connected to the electric control board (180).

2. An air compression device according to claim 1, characterized in that: The second functional module (140) is detachably mounted on the first functional module (110).

3. An air compression device according to claim 1, characterized in that: The valve assembly (190) is arranged side by side on one side of the first functional module (110), and the electric control board (180) extends to one side of the housing (120).

4. An air compression device according to claim 1, characterized in that: A mounting block (161) is protrudingly provided on one side of the crankcase (160); an air inlet end of the air dryer (150) is connected to the mounting end of the mounting block (161); an air path A (70) is provided in the crankcase (160) and the mounting block (161); the air path A (70) is used to connect the exhaust port of the air compression unit and the air inlet end of the air dryer (150); an air path B (80) is provided in the housing (120); two ends of the air path B (80) are respectively connected to the air dryer (150) and the valve assembly (190).

5. An air compression device according to claim 1, characterized in that: The valve assembly (190) includes a mounting seat, an intake air path (10) constructed inside the mounting seat, a plurality of A solenoid valves (390) and at least one B solenoid valve (360), wherein the mounting seat has useful air paths (40) constructed inside corresponding to the positions of the A solenoid valves (390), and the mounting seat has an exhaust air path (20) constructed inside corresponding to the positions of the B solenoid valves (360), and both the useful air path (40) and the exhaust air path (20) are connected to the intake air path (10).

6. An air compression device according to claim 5, characterized in that: The valve assembly (190) further includes a pneumatic safety valve (350), wherein the intake air circuit (10) is connected to the pneumatic safety valve (350) via an exhaust air circuit 2 (50), wherein the pneumatic safety valve (350) can adjust the air pressure of the intake air circuit (10) by opening and closing the exhaust air circuit 2 (50), wherein the B solenoid valve (360) is a two-position three-way valve, wherein the B solenoid valve (360) is connected to the pneumatic safety valve (350) via an exhaust air circuit 3 (60), and wherein the B solenoid valve (360) is used to switch the exhaust air circuit 1 (20) to be connected to the intake air circuit (10) or the intake air circuit (10) to be connected to the exhaust air circuit 3 (60).

7. An air compression device according to claim 1, characterized in that: It also includes a pressure sensor (370), which can be arranged on the valve assembly (190). The pressure sensor (370) is used to measure the pressure of the air after being dried by the air dryer (150). The pressure sensor (370) is electrically connected to the electric control board (180).

8. An air compression device according to claim 1, characterized in that: The air compression assembly is a two-stage crank connecting rod piston group arranged inside the crankcase (160) and driven by the motor (130). The two-stage crank connecting rod piston group is configured with a primary compression chamber (340) and a secondary compression chamber (342) inside the crankcase (160). The two-stage crank connecting rod piston group is used to pump the gas compressed by the primary compression chamber (340) into the secondary compression chamber (342) for further compression. The intake end of the primary compression chamber (340) is provided with a primary one-way intake valve (210), and the exhaust end of the primary compression chamber (340) is provided with a primary one-way exhaust valve (260). The primary compression chamber (340) and the secondary compression chamber (342) are connected via a compressed gas medium channel (270). The intake end of the secondary compression chamber (342) is provided with a secondary one-way intake valve (320), and the exhaust end of the secondary compression chamber (342) is provided with a secondary one-way exhaust valve (330).

9. A suspension system, characterized in that: The invention comprises an air compression device (100), an air spring (400) and an air storage tank (380), wherein the air compression device (100) is an air compression device according to claim (8), wherein an air intake path (10) is sequentially connected to the primary compression chamber (340), the secondary compression chamber (342), an air dryer (150) and a plurality of air springs (400), and the air intake path (10) located downstream of the air dryer (150) is connected to an exhaust gas path 1 (20) and the air storage tank (380), and the air storage tank (380) is also connected to the primary compression chamber (340) or the secondary compression chamber (342) via a gain gas path (30); The valve assembly (190) is used to realize the opening and closing of the air path between the air compression unit, the air storage tank (380) and the air spring (400).

10. A suspension system according to claim 9, characterized in that: The exhaust end of the gain gas path (30) is connected to the primary compression chamber (340), and the exhaust branch of the gain gas path (30) is connected to the crankcase (160) which is in communication with the motor (130). A pressure relief valve (820) is provided on the gain gas path (30) between the crankcase (160) and the primary compression chamber (340).

Images