Closed air suspension compressor not integrated with controller and compatible with single air storage tank and double air storage tanks

Abstract

The utility model provides a closed air suspension compressor not integrated with a controller and compatible with a single air storage tank and double air storage tanks, which belongs to the technical field of compressors and comprises a valve body and a plug connector which are arranged on a solenoid valve glue pouring sealing area. An air inlet, an air outlet, a high-pressure air storage tank, a low-pressure air storage tank, an FL-left front air spring, an FR-right front air spring, an RL-left rear air spring, an RR-right rear air spring and a motor assembly are arranged at the top of the valve body; an air cylinder and a drying barrel are arranged on the side wall of the valve body. A double-air-storage-tank structure is adopted, in the rapid chassis descending mode, the compressor extracts high-pressure air in the air spring to the low-pressure air storage tank, in other words, in the rapid chassis descending mode, the compressor further extracts the high-pressure air in the air spring to the high-pressure air storage tank, and the high-pressure air in the low-pressure air storage tank is pumped to the low-pressure air storage tank. Therefore, the problem of low descending speed of the chassis in the closed compressor is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressor technical field, specifically, it relates to the closed air suspension compressor of not integrated controller and compatible single double gas tank. BACKGROUND

[0002] With the development of automobile chassis technology, air suspension system is widely used because of its excellent comfort and handling.

[0003] As the power unit of the whole system, the air compressor bears the core demand of chassis lifting and air spring, gas tank energy storage. Compared with the open air suspension system, the closed air suspension system usually integrates air compressor, distribution valve, controller and other components together, the required layout space of chassis is small, the product integration degree is high, and the development cost can be effectively reduced.

[0004] However, with the gradual maturity of chassis domain control technology, the demand of OEM gradually changes to the domain controller to complete the system control of all components of the chassis, and each sub-component only serves as an execution unit without separate control, so the closed compressor without integrated controller emerges as the times require.

[0005] The current closed air suspension compressor has the following problems:

[0006] 1. Slow chassis lowering speed: the closed compressor needs to work in the process of chassis lowering and lifting, unlike the open system that can directly discharge the high-pressure gas of the air spring to the gas tank, which leads to slow chassis lowering speed. The compressors on the market adopt similar single gas tank scheme (9 electromagnetic valves) or double gas tank scheme (12 electromagnetic valves), and the double gas tank scheme can refer to Figure 16 , which uses the compressor to extract high-pressure air in the air spring to the gas tank, resulting in slow chassis lowering speed.

[0007] 2. Complex double gas tank scheme design: the double tank scheme in the prior art is purely forced to be divided into two due to limited chassis space, and refers to Figure 16 , the internal gas circuit is still a single tank scheme, which cannot realize the advantages of high and low pressure gas tank. INVENTION CONTENTS

[0008] In order to make up for the above shortcomings, the utility model provides a closed air suspension compressor without integrated controller and compatible with single and double gas tanks, aiming at improving the problems of slow chassis lowering speed and complex double gas tank scheme design.

[0009] The utility model is realized as follows:

[0010] The utility model provides a kind of closed air suspension compressor of single double gas storage tank compatible without integrated controller, including the valve body and plug connector installed on electromagnetic valve glue sealing area, the valve body top is provided with air inlet, exhaust, high-pressure gas tank, low-pressure gas tank, FL-left front air spring, FR-right front air spring, RL-left rear air spring, RR-right rear air spring and motor assembly;The valve body side wall is provided with cylinder and drying barrel.

[0011] Preferably, the valve body is provided with LR solenoid valve, RV1 solenoid valve, RV2 solenoid valve, RV3 solenoid valve and RV4 solenoid valve.

[0012] Preferably, the valve body is provided with:

[0013] A1 gas pipe: the FL-left front air spring, the FR-right front air spring, the RL-left rear air spring and the RR-right rear air spring are sequentially and parallelly arranged on the A1 gas pipe.

[0014] Preferably, one end of the LR solenoid valve is communicated with the low-pressure gas tank, and the other end is communicated with the A1 gas pipe.

[0015] Preferably, the valve body is provided with:

[0016] A2 gas pipe: the A2 gas pipe is arranged at one end of the RV4 solenoid valve, and the other end of the RV4 solenoid valve is connected to the A1 gas pipe.

[0017] Preferably, one end of the RV3 solenoid valve is connected to the A1 gas pipe, and the other end is connected to one end of the RV2 solenoid valve.

[0018] The connection position of the RV3 solenoid valve and the A1 gas pipe is between the RL-left rear air spring and the RR-right rear air spring connected to the A1 gas pipe.

[0019] Preferably, one end of the RV2 solenoid valve is connected with the high-pressure gas tank, and the other end of the RV2 solenoid valve is connected with A3 gas pipe, and one end of the RV3 solenoid valve is connected to the A3 gas pipe.

[0020] Preferably, one end of the RV1 solenoid valve is connected to the RV2 solenoid valve and the high-pressure gas tank communication pipeline, and the other end is connected to the A2 gas pipe through A4 gas pipe.

[0021] Preferably, A5 gas pipe is further connected to the A2 gas pipe, one end of the A5 gas pipe is connected to the air inlet, and the connection position of the A5 gas pipe and the A2 gas pipe is downstream of the connection position of the A4 gas pipe and the A2 gas pipe.

[0022] The A5 gas conveying pipe is sequentially connected with an air filter, a guide valve A, a pump, a drying barrel and a one-way valve B.

[0023] The A3 gas conveying pipe is connected with the A5 gas conveying pipe, and the connection position is located between the guide valve A and the pump.

[0024] Preferably, a pressure relief valve is connected in parallel with the pump on the A5 gas conveying pipe.

[0025] The A5 gas conveying pipe is further connected with an A6 gas conveying pipe, the A6 gas conveying pipe is connected with a mechanical exhaust valve and an electromagnetic exhaust valve, and the other end of the electromagnetic exhaust valve is connected with the exhaust port.

[0026] The utility model discloses a beneficial effect is:

[0027] The utility model discloses a double gas storage tank structure, under the mode of quick chassis descending, the compressor extracts high pressure air in air spring to low pressure gas storage tank, the utility model further has the mode of quick chassis descending, under the mode of quick chassis descending, further, the compressor extracts high pressure air in air spring to high pressure gas storage tank, thereby solve the problem of slow chassis descending speed in closed compressor.

[0028] In addition, the utility model adopts 10 electromagnetic valves to realize high and low pressure double gas storage tank scheme, compared with 12 electromagnetic valve design in prior art, has same satisfaction chassis quick descending demand, can also realize the advantage of open system for some working conditions, and 10 electromagnetic valves of the utility model can also be compatible with the advantage of single gas storage tank, provide more chassis arrangement freedom. ACCURACY OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment needed to use the drawing briefly introduced, should understand, the following drawing only shows some embodiments of the utility model, therefore should not be seen as the limitation to the range, for ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0030] Figure 1 It is a closed air suspension compressor structure schematic view of the utility model embodiment that is compatible with single and double gas storage tanks without integrating a controller;

[0031] Figure 2 It is a top view of the closed air suspension compressor of the utility model embodiment that is compatible with single and double gas storage tanks without integrating a controller;

[0032] Figure 3 It is a single and double gas storage tank scheme switching mode diagram of the closed air suspension compressor of the utility model embodiment that is compatible with single and double gas storage tanks without integrating a controller.

[0033] Figure 4 is a single double gas tank in the fast chassis descending mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0034] Figure 5 is a single double gas tank in the rapid chassis descending mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0035] Figure 6 is a single double gas tank in the process state diagram of emptying the residual gas in the low pressure tank of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0036] Figure 7 is a single double gas tank in the chassis normal lifting mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0037] Figure 8 is a single double gas tank in the chassis fast (silent) lifting mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0038] Figure 9 is a single double gas tank in the road impact load relief mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0039] Figure 10 is a single double gas tank in the air spring exhaust to the outside mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0040] Figure 11 is a single double gas tank in the high pressure gas tank exhaust to the outside mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0041] Figure 12 is a single double gas tank in the air supplementing working condition mode state diagram of the closed air suspension compressor provided by the utility model embodiment not integrated with the controller and compatible with single double gas tank;

[0042] Figure 13is a single double gas tank in the single double gas tank in the pressure protection (internal leakage) mode state chart of the closed air suspension compressor compatible with single double gas tank without integrated controller provided by the utility model embodiment;

[0043] Figure 14 is a single double gas tank in the single double gas tank in the pressure protection (external leakage) mode state chart of the closed air suspension compressor compatible with single double gas tank without integrated controller provided by the utility model embodiment;

[0044] Figure 15 is a single double gas tank in the single double gas tank in the manual exhaust (maintenance mode) mode state chart of the closed air suspension compressor compatible with single double gas tank without integrated controller provided by the utility model embodiment;

[0045] Figure 16 is the electrical diagram of the closed air suspension compressor in the prior art.

[0046] In the figure: 1, motor assembly;2, drying barrel;3, valve body;4, plug-in part;5, cylinder;6, electromagnetic valve glue filling sealing area;7, air inlet;8, exhaust port;9, high-pressure gas tank;10, low-pressure gas tank;11, FL-left front air spring;12, FR-right front air spring;13, RL-left rear air spring;14, RR-right rear air spring. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely in combination with the drawings in the utility model embodiment. Obviously, the described embodiment is a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0048] EMBODIMENT

[0049] REFERENCE Figures 1-15 A closed air suspension compressor compatible with single double gas tank without integrated controller, comprising a valve body 3 and a plug-in part 4 installed on the electromagnetic valve glue filling sealing area 6, the valve body 3 top is provided with air inlet 7, exhaust port 8, high-pressure gas tank 9, low-pressure gas tank 10, FL-left front air spring 11, FR-right front air spring 12, RL-left rear air spring 13, RR-right rear air spring 14 and motor assembly 1;The side wall of valve body 3 is provided with cylinder 5 and drying barrel 2.

[0050] It needs to be added: the valve body 3 is provided with LR solenoid valve, RV1 solenoid valve, RV2 solenoid valve, RV3 solenoid valve and RV4 solenoid valve. Among them, RV1 solenoid valve, RV2 solenoid valve, RV3 solenoid valve and RV4 solenoid valve are two-position two-way reversing solenoid valves; FL-left front air spring 11, FR-right front air spring 12, RL-left rear air spring 13, RR-right rear air spring 14 and LR solenoid valve are two-position two-way solenoid valves with one-way conduction.

[0051] Based on the internal structure of the valve body 3, referring to Figures 3-15 , the utility model makes the following explanations to the internal structure:

[0052] 1, the valve body 3 is provided with A1 gas pipe: FL-left front air spring 11, FR-right front air spring 12, RL-left rear air spring 13 and RR-right rear air spring 14 are sequentially and parallelly arranged on A1 gas pipe;

[0053] 2, one end of LR solenoid valve is communicated with low-pressure gas storage tank 10, and the other end is communicated with A1 gas pipe.

[0054] 3, the valve body 3 is provided with A2 gas pipe: A2 gas pipe is arranged at one end of RV4 solenoid valve, and the other end of RV4 solenoid valve is connected to A1 gas pipe.

[0055] 4, one end of RV3 solenoid valve is connected to A1 gas pipe, and the other end is connected to one end of RV2 solenoid valve;

[0056] The connection position of RV3 solenoid valve and A1 gas pipe is located between RL-left rear air spring 13 and RR-right rear air spring 14 connected in A1 gas pipe.

[0057] 5, one end of RV2 solenoid valve is connected with high-pressure gas storage tank 9, and the other end of RV2 solenoid valve is connected with A3 gas pipe, and one end of RV3 solenoid valve is connected to A3 gas pipe.

[0058] 6, one end of RV1 solenoid valve is connected to the communication pipeline of RV2 solenoid valve and high-pressure gas storage tank 9; the other end is connected with A2 gas pipe through A4 gas pipe.

[0059] 7, A2 gas pipe is also connected with A5 gas pipe, and the other end of A5 gas pipe is connected with air inlet 7; the connection position of A5 gas pipe and A2 gas pipe is located downstream of the connection position of A4 gas pipe and A2 gas pipe; air filter, pilot valve A, pump, drying barrel and check valve B are sequentially connected on A5 gas pipe; A3 gas pipe is connected with A5 gas pipe, and the connection position is located between pilot valve A and pump. Referring to Figures 3-15 , air filter is Filter in the figure, drying barrel is Dryer in the figure, and pump is pump in the figure. The pump is the existing technology of air pump.

[0060] 8, A5 gas pipe with a parallel relief valve; A5 gas pipe also connected with A6 gas pipe, A6 gas pipe connected with mechanical exhaust valve and electromagnetic exhaust valve, the other end of the electromagnetic exhaust valve and exhaust port 8 connected. Among them, refer to Figures 3-15 , mechanical exhaust valve for the PRV in the figure, electromagnetic exhaust valve for the EV in the figure.

[0061] Finally, it needs to be added that: the valve body is also provided with a sensor, refer to Figures 3-15 , the sensor for the Sensor in the figure, the sensor and FL-left front air spring 11, FR-right front air spring 12, RL-left rear air spring 13, RR-right rear air spring 14, LR solenoid valve, RV1 solenoid valve, RV2 solenoid valve, RV3 solenoid valve, RV4 solenoid valve and electromagnetic exhaust valve are electrically connected.

[0062] The working principle of the closed air suspension compressor without integrated controller and compatible with single and double gas storage tank:

[0063] I. Single and double gas tank switching scheme

[0064] Refer to Figure 3 , shielding LR solenoid valve to realize mutual switching between single gas tank scheme and double gas tank scheme, to meet the complementarity between high performance and high cost performance.

[0065] II. Fast chassis lowering mode

[0066] Refer to Figure 4 , chassis lowering includes front axle lowering and rear axle lowering two working conditions (the figure only shows the front axle lowering process), this embodiment directly releases the high-pressure air spring internal gas to the low-pressure gas storage tank 10, without going through the compressor. The effect of releasing to the atmosphere similar to the open system is achieved, and the chassis lowering speed is higher than that of the traditional closed compressor through the air pump. Moreover, the compressor does not need to work, and will not produce additional compressor working noise and power consumption. The specific process is as follows:

[0067] FL-left front air spring 11, FR-right front air spring 12 flow to the low-pressure gas storage tank 10 through A1 gas pipe and LR solenoid valve in turn.

[0068] III. Rapid chassis lowering mode

[0069] Refer to Figure 5 , when the fast chassis lowering mode does not meet the owner's demand, we simultaneously start the compressor, release the high-pressure gas in the air spring to the low-pressure gas storage tank, and extract it to the high-pressure gas storage tank, to realize the rapid lowering mode (only show the front axle lowering process). The specific process is as follows:

[0070] FL - left front air spring 11, FR - right front air spring 12 in turn through the A1 gas pipe and LR solenoid valve to the low pressure gas tank 10; in addition, the A1 gas pipe in turn through the RV3 solenoid valve, A3 gas pipe, A5 gas pipe, A2 gas pipe, A4 gas pipe, RV1 solenoid valve, and is connected with the high pressure gas tank 9.

[0071] Four, emptying the residual gas in the low pressure tank process

[0072] Referring to Figure 6 Because the low pressure tank needs to keep near 0bar state at any time to simulate the open system atmospheric pressure state, after the chassis is lowered, the compressor needs to be started as soon as possible to extract the residual gas in the low pressure tank to the high pressure gas tank, so as to prepare for the next chassis rapid lowering condition. This process can be carried out during vehicle operation, reducing the user's noise annoyance. The specific process is as follows:

[0073] The low pressure gas tank 10 is connected with the high pressure gas tank 9 in turn through the LR solenoid valve, A1 gas pipe, RV3 solenoid valve, A3 gas pipe, A5 gas pipe, A2 gas pipe, A4 gas pipe and RV1 solenoid valve.

[0074] Five, the chassis normal lifting mode

[0075] Referring to Figure 7 When the pressure in the high pressure tank is insufficient, the gas in the high pressure tank is extracted to the air spring by the compressor to realize the lifting of the front and rear axles. The specific process is as follows:

[0076] The high pressure gas tank 9 is output from the FL - left front air spring 11 and FR - right front air spring 12 in turn through the RV2 solenoid valve, A3 gas pipe, A5 gas pipe, A2 gas pipe and A1 gas pipe.

[0077] Six, the chassis rapid (silent) lifting mode

[0078] Referring to Figure 8 When the pressure in the high pressure gas tank is high, the rapid lifting scheme is recommended, which is similar to the open system, and the gas in the high pressure tank is directly released to the air spring. This process does not need the participation of the compressor, and realizes better rapid and silent lifting effect; especially in the static state of the vehicle, this lifting strategy can meet the user's chassis lifting demand in complete silence. The specific process is as follows:

[0079] The high pressure gas tank 9 is output from the FL - left front air spring 11 and FR - right front air spring 12 in turn through the RV2 solenoid valve, A3 gas pipe, RV3 solenoid valve and A1 gas pipe.

[0080] Seven, the mode of relieving road impact load

[0081] Referring to Figure 9When the air spring encounters road impact load such as deceleration zone, pit, etc., the internal pressure of the air spring will rise rapidly. In order to avoid the influence of high pressure on the service life of the air spring, the FL, FR, RL, RR, LR electromagnetic valve is provided with a one-way conduction function, and after the air spring pressure exceeds a certain set value, it is quickly released to the low-pressure tank, and the impact load inside the air spring is linked. The specific process is as follows:

[0082] The internal air pressure of FL-left front air spring 11, FR-right front air spring 12, RL-left rear air spring 13 and RR-right rear air spring 14 flows into the low-pressure gas tank 10 through the A1 gas pipe, the LR electromagnetic valve in turn.

[0083] Eight, air spring exhaust to the outside mode

[0084] Reference Figure 10 When the vehicle needs to be repaired or some special conditions such as tests, etc., the air spring needs to be emptied, and the internal gas circuit principle is as follows: When the high-pressure gas passes through the RV4 electromagnetic valve, it will enter the orifice to realize high-pressure gas throttling and pressure reduction, thereby ensuring the regeneration performance of the drying agent and reducing the exhaust noise. The orifice is connected in parallel with the one-way valve B, and the specific process is as follows:

[0085] The internal air pressure of FL-left front air spring 11, FR-right front air spring 12, RL-left rear air spring 13 and RR-right rear air spring 14 flows into the low-pressure gas tank 10 through the A1 gas pipe, the LR electromagnetic valve in turn. Figure 10 The EV end in the exhaust valve is discharged.

[0086] Nine, high-pressure gas tank exhaust to the outside mode

[0087] Reference Figure 11 Similar to the air spring exhaust to the outside mode, this is to exhaust the high-pressure gas tank to the outside atmosphere, and still needs to throttle and reduce pressure and regenerate the drying agent. The specific process is as follows:

[0088] The high-pressure gas tank 9 passes through the RV1 electromagnetic valve, the A4 gas pipe, the A2 gas pipe, the orifice, the A5 gas pipe and the A6 gas pipe in turn, and is discharged from the electromagnetic exhaust valve, that is, the EV end in the exhaust valve is discharged. Figure 11 The EV end in the exhaust valve is discharged.

[0089] Ten, air supplementing mode

[0090] Reference Figure 12 The air supplementing mode includes two modes of air supplementing to the high-pressure gas tank and the air spring, and here only the process of air supplementing to the high-pressure tank is demonstrated. The external gas enters the compressor through the air filter (the filter in the Figure 12 The drying barrel (the drying barrel in the Figure 12After the air is exhausted from the air inlet 7, it passes through the A5 gas conveying pipe, the A2 gas conveying pipe, the A4 gas conveying pipe, and the RV1 electromagnetic valve in sequence, and finally enters the high-pressure gas tank 9. The specific process is as follows:

[0091] After the air is exhausted from the air inlet 7, it passes through the A5 gas conveying pipe, the A2 gas conveying pipe, the A4 gas conveying pipe, and the RV1 electromagnetic valve in sequence, and finally enters the high-pressure gas tank 9. The specific process is as follows:

[0092] Eleven, pressure protection (internal leakage) mode

[0093] Referring to Figure 13 , when the compressor outlet pressure exceeds the set value, the pressure relief valve opens, and the internal leakage is to the pump inlet end. During the internal leakage pressure protection, the gas in the air suspension system is still present in the interior.

[0094] Twelve, pressure protection (external leakage) mode

[0095] Referring to Figure 14 , when the compressor outlet pressure exceeds the set value, the pressure relief valve opens, and the internal leakage is to the air inlet end, and the external leakage leaks the excess flow to the atmosphere, and the total air volume in the compressor is reduced. The pressure relief valve is connected to the A5 gas conveying pipe through the A7 gas conveying pipe. The specific process is as follows:

[0096] In this mode, the high-pressure gas tank 9 supplies gas to the FL-left front air spring 11 and the FR-right front air spring 12, i.e. the high-pressure gas tank 9 outputs from the FL-left front air spring 11 and the FR-right front air spring 12 in sequence through the RV2 electromagnetic valve, the A3 gas conveying pipe, the A5 gas conveying pipe, the A2 gas conveying pipe, and the A1 gas conveying pipe.

[0097] Further, the pressure relief valve PRV discharges the excess flow in the A5 gas conveying pipe to the atmosphere through the connection of the A7 gas conveying pipe and the A5 gas conveying pipe.

[0098] Thirteen, manual exhaust mode maintenance mode

[0099] Referring to Figure 15 , if the EV valve fails, the entire system will not be able to exhaust to the outside, especially in special maintenance conditions, manual release of system pressure may be required. The MV valve here is a manual mechanical valve that can be manually opened to release system pressure to meet the manual exhaust requirements of test conditions or maintenance conditions. The specific process is as follows:

[0100] The internal air pressure of the FL-left front air spring 11, the FR-right front air spring 12, the RL-left rear air spring 13, and the RR-right rear air spring 14 passes through the A1 gas conveying pipe, the A2 gas conveying pipe, the orifice, the A5 gas conveying pipe, and the A6 gas conveying pipe in sequence, and is discharged from the MV pressure relief valve.

[0101] It should be noted that the specific model of the motor needs to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the art, so it will not be described in detail.

[0102] The preferred embodiments of the present application have been described above, and are not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A closed air suspension compressor without integrated controller and compatible with single or double gas tank, comprising a valve body (3) and a spigot (4) mounted on the solenoid valve glue-filled sealing area (6), characterized in that, The valve body (3) top is provided with air inlet (7), exhaust port (8), high pressure gas tank (9), low pressure gas tank (10), FL-left front air spring (11), FR-right front air spring (12), RL-left rear air spring (13), RR-right rear air spring (14) and motor assembly (1); The valve body (3) side wall is provided with cylinder (5) and drying barrel (2).

2. A closed air suspension compressor with non-integrated controller and compatible with single or dual gas tank according to claim 1, characterized in that, The valve body (3) is provided with LR solenoid valve, RV1 solenoid valve, RV2 solenoid valve, RV3 solenoid valve and RV4 solenoid valve.

3. A closed air suspension compressor of claim 2, wherein, The valve body (3) is provided with: A1 gas pipe: the FL-left front air spring (11), the FR-right front air spring (12), the RL-left rear air spring (13) and the RR-right rear air spring (14) are sequentially and parallelly arranged on the A1 gas pipe.

4. A closed air suspension compressor of claim 3, wherein, One end of the LR solenoid valve is communicated with the low pressure gas tank (10), and the other end is communicated with the A1 gas pipe.

5. A closed air suspension compressor of claim 4, wherein, The valve body (3) is provided with: A2 gas pipe: the A2 gas pipe is arranged at one end of the RV4 solenoid valve, and the other end of the RV4 solenoid valve is connected to the A1 gas pipe.

6. A closed air suspension compressor of claim 5, wherein, One end of the RV3 solenoid valve is connected to the A1 gas pipe, and the other end is connected to one end of the RV2 solenoid valve; The connection position of the RV3 solenoid valve and the A1 gas pipe is located between the RL-left rear air spring (13) and the RR-right rear air spring (14) connected to the A1 gas pipe.

7. A closed air suspension compressor of claim 6, wherein, One end of the RV2 solenoid valve is connected with the high pressure gas tank (9), and the other end of the RV2 solenoid valve is connected with A3 gas pipe, and one end of the RV3 solenoid valve is connected to the A3 gas pipe.

8. A closed air suspension compressor of claim 7, wherein, One end of the RV1 solenoid valve is connected to the communication pipeline of the RV2 solenoid valve and the high pressure gas tank (9); The other end is connected with the A2 gas pipe through A4 gas pipe.

9. A closed air suspension compressor of claim 8, wherein, The A2 gas pipe is also connected with A5 gas pipe, the other end of the A5 gas pipe is connected with the air inlet (7), and the connection position of the A5 gas pipe and the A2 gas pipe is located downstream of the connection position of the A4 gas pipe and the A2 gas pipe; The A5 gas pipe is sequentially connected with air filter, pilot valve A, pump, drying barrel and check valve B; The A3 gas pipe is connected with the A5 gas pipe, and the connection position is located between the pilot valve A and the pump.

10. The closed air suspension compressor of claim 9, wherein, The A5 gas pipe is connected with pressure relief valve in parallel with the pump: The A5 gas pipe is also connected with A6 gas pipe, the A6 gas pipe is connected with mechanical exhaust valve and electromagnetic exhaust valve, and the other end of the electromagnetic exhaust valve is connected with the exhaust port (8).

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