Filter unit, air supply apparatus, air suspension system and vehicle

Abstract

A filter unit, an air supply apparatus, an air suspension system, and a vehicle. The filter unit comprises: a housing, a desiccant, and a pressure relief device, an inlet and an outlet being formed in the housing, and the desiccant being provided in the housing. The pressure relief device is provided on the housing, and a pressure relief port is formed in the pressure relief device. When the pressure relief port is opened, a fluid at the outlet is suitable for flowing through the desiccant and being discharged to the external atmosphere through the pressure relief port.

Description

Filter unit, air supply device, air suspension system and vehicle

[0001] This application claims priority to Chinese Patent Application No. 202410985655.2, filed on July 22, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of vehicles, and in particular to a filter unit, an air supply device, an air suspension system and a vehicle. BACKGROUND

[0003] In the related art, the air supply device includes a drying filter unit and a compression unit. The compression unit is driven by a driving mechanism to make the piston move reciprocally. The gas enters the first compression cavity through the hole on the piston from the air inlet, and then enters the second compression cavity through the air duct on the piston. Finally, the gas enters the drying filter unit. The drying filter unit is controlled by the electromagnetic valve to realize the inflation, deflation and exhaust processes of the system. In addition, the filter shell separates the desiccant from the shell to remove the moisture of the desiccant through the filter cavity during deflation, thereby increasing the service life of the desiccant. SUMMARY

[0004] The present disclosure aims to at least solve one of the technical problems existing in the related art.

[0005] In one aspect, a filter unit is provided, which can simplify the structure of the filter unit and improve the reliability of the filter unit. The filter unit is suitable for an air suspension system and includes a housing, a desiccant and a pressure relief device. The housing has a cavity formed therein. The desiccant is arranged in the cavity. The pressure relief device is arranged on the housing. The pressure relief device has a pressure relief opening formed thereon. The pressure relief opening is in communication with the cavity. When the pressure relief opening is opened, the exhaust fluid is adapted to flow through the desiccant and be discharged to the external atmosphere through the pressure relief opening.

[0006] In the filter unit of the present disclosure, the housing serves as the main frame of the entire filter unit and functions to accommodate the internal components and form a fluid passage. When an abnormally high pressure is encountered, the pressure relief device can relieve the internal pressure by opening the pressure relief opening, thereby protecting the equipment from damage and ensuring the safety of the operating environment. The main function of the pressure relief device is to prevent the pressure in the housing from being too high. The filter unit of the present disclosure has fewer parts, high integration and simple structure, which is conducive to improving the space utilization of the filter unit as a whole, reducing the production cost of the filter unit, improving the overall reliability of the filter unit and prolonging the service life of the filter unit.

[0007] In some embodiments, the pressure relief device comprises a pressure relief pipe, a first end of the pressure relief pipe having the pressure relief port, when the pressure relief port is opened, the outflowing fluid flows through the desiccant and enters the pressure relief pipe through a second end of the pressure relief pipe, and is discharged to the external atmosphere through the pressure relief port.

[0008] In some embodiments, an inlet and an outlet are formed on the housing. The inlet and the outlet are respectively located at two ends of the housing, and the desiccant is located between the inlet and the outlet. The second end of the pressure relief pipe is located on the side where the inlet is located, and the first end of the pressure relief pipe is located on the side where the outlet is located.

[0009] In some embodiments, the pressure relief pipe is at least partially arranged in the housing, and an accommodation space configured to accommodate the desiccant is defined between the inner wall of the housing and the pressure relief pipe.

[0010] In some embodiments, the desiccant is in contact with the inner wall of the housing.

[0011] In some embodiments, the desiccant comprises a first perforated plate, a second perforated plate, and a desiccant body. The first perforated plate is arranged adjacent to the inlet, and the second perforated plate is arranged adjacent to the outlet. The desiccant body is arranged between the first perforated plate and the second perforated plate, and the pressure relief pipe is arranged through the first perforated plate, the desiccant body, and the second perforated plate.

[0012] In some embodiments, the first perforated plate and the corresponding inner wall of the housing are spaced apart from each other to define a first communication cavity. The inlet and the second end of the pressure relief pipe adjacent to the inlet are respectively in communication with the first communication cavity.

[0013] In some embodiments, the second perforated plate and the corresponding inner wall of the housing are spaced apart from each other to define a second communication cavity. The outlet is in communication with the second communication cavity.

[0014] In some embodiments, the pressure relief pipe of the pressure relief device and the housing are integrally injection molded.

[0015] In some embodiments, the pressure relief device comprises a pressure relief valve arranged at the pressure relief port, the pressure relief valve being configured to open and close the pressure relief port.

[0016] In some embodiments, the pressure relief valve comprises a pressure relief housing, a partition plate arranged in the pressure relief housing to divide the pressure relief housing into a first chamber and a second chamber. The pressure relief port is in communication with the first chamber in an on-off manner. An exhaust port is formed on the first chamber, and the exhaust port is adapted to communicate with the external atmosphere.

[0017] In some embodiments, the pressure relief valve further comprises a pressure relief movable rod, the pressure relief movable rod is arranged in the partition plate, one end of the pressure relief movable rod in the first chamber is provided with a pressure relief plug, the pressure relief plug is configured to block or open the pressure relief port, one end of the pressure relief movable rod in the second chamber is provided with a movable plate, the movable plate divides the second chamber into a first sub-chamber and a second sub-chamber, the first sub-chamber is switchably communicated with the outlet of the housing and the second sub-chamber.

[0018] In some embodiments, the pressure relief valve further comprises a switching valve, the first sub-chamber is switchably communicated with the outlet and the second sub-chamber through the switching valve.

[0019] In some embodiments, when the pressure at the outlet reaches a predetermined pressure threshold, the pressure relief plug opens the pressure relief port.

[0020] In some embodiments, when the pressure relief port is closed, the first sub-chamber and the second sub-chamber are communicated.

[0021] In some embodiments, the pressure relief valve further comprises an elastic member, the elastic member is abutted between the movable plate and the inner wall of the second sub-chamber.

[0022] In another aspect, an air supply device is provided, comprising a compression unit and the above-mentioned filter unit, the inlet of the filter unit is switchably communicated with the compression unit.

[0023] In some embodiments, the compression unit comprises a cylinder and a moving assembly, the cylinder is provided with an air inlet, the moving assembly is movably arranged in the cylinder, the moving assembly divides the cylinder into a first compression chamber and a second compression chamber, the first compression chamber is communicated with the air inlet, the second compression chamber is switchably communicated with the first compression chamber through the moving assembly.

[0024] In some embodiments, the cylinder is provided with a containing cavity configured to contain the moving assembly, the pressure relief port and the air inlet are respectively communicated with the containing cavity.

[0025] In some embodiments, the cylinder is provided with an airflow channel, the airflow channel is configured for gas to enter the first compression chamber from the air inlet.

[0026] In some embodiments, the cylinder comprises a cylinder body and an end cover, the end cover and the cylinder body jointly enclose the containing cavity, the airflow channel comprises an end cover communication channel formed on the end cover.

[0027] In some embodiments, the airflow passage further includes an air intake passage formed on the cylinder body, the air intake passage being connected to the air intake port and the end cover communication passage, respectively.

[0028] In some embodiments, the cylinder further includes a one-way valve adapted to be disposed in the airflow passage so that fluid flowing through the one-way valve flows unidirectionally to the first compression chamber.

[0029] In some embodiments, the one-way valve is located at one end of the end cap communication channel that communicates with the first compression chamber.

[0030] In some embodiments, the air supply device further includes a temperature sensor configured to acquire the temperature of the gas in the first compression chamber, the temperature sensor being disposed on the end cap.

[0031] In some embodiments, the air supply device further includes a drive mechanism connected to the motion component to drive the motion component to move relative to the cylinder.

[0032] In some embodiments, the moving assembly includes a piston rod and a sealing device. The piston rod is movably disposed within the cylinder body, dividing the interior of the cylinder body into a first compression chamber and a second compression chamber. A communicating channel is formed within the piston rod, and the second compression chamber is in continuous communication with the first compression chamber through the communicating channel. The sealing device is disposed between one end of the piston rod adjacent to the second compression chamber and the inner wall of the cylinder body.

[0033] In some embodiments, the sealing device includes a pressure head and a cup. The pressure head is disposed at one end of the piston connecting rod adjacent to the second compression chamber, and a through hole is formed on the pressure head. The second compression chamber is adapted to communicate with the communication channel through the through hole. The cup is disposed between the pressure head and the piston connecting rod, and the cup is located between the pressure head and the inner wall of the cylinder.

[0034] On the other hand, an air suspension system is proposed, which includes the air supply equipment described above.

[0035] On the other hand, a vehicle is proposed that includes the air suspension system described above.

[0036] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0037] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0038] Fig. 1 is a structural diagram of an air supply device according to some embodiments.

[0039] Fig. 2 is a side view of an air supply device according to some embodiments.

[0040] Fig. 3 is a sectional view of an air supply device according to some embodiments.

[0041] Fig. 4 is a schematic diagram of fluid flow when an air suspension system is in an inflated state according to some embodiments.

[0042] Fig. 5 is a schematic diagram of fluid flow when an air suspension system is in a deflated state according to some embodiments.

[0043] Fig. 6 is a schematic diagram of fluid flow when an air suspension system is in a deflated state according to some embodiments.

[0044] Fig. 7 is a sectional view of a motion assembly according to some embodiments.

[0045] Fig. 8 is a structural diagram of a motion assembly according to some embodiments.

[0046] Fig. 9 is a block diagram of an air suspension system according to some embodiments.

[0047] Fig. 10 is a block diagram of a vehicle according to some embodiments.

[0048] Reference Signs: 1000, vehicle; 200, air suspension system; 100, air supply device; 10, filter unit; 11, housing; 111, inlet; 112, outlet; 12, desiccant; 121, first orifice plate; 122, second orifice plate; 123, desiccant body; 124, first communication cavity; 125, second communication cavity; 20, pressure relief device; 21, pressure relief pipe; 22, pressure relief port; 23, pressure relief valve; 231, switching valve; 24, pressure relief housing; 25, pressure relief movable rod; 251, pressure relief plug; 252, movable plate; 26, partition plate; 27, first chamber; 271, discharge port; 272, air return pipe; 28, second chamber; 281, first sub-chamber; 282, second sub-chamber; 29, elastic member; 30, compression unit; 31, cylinder body; 32, air inlet; 33, first compression chamber; 34, second compression chamber; 35, containing cavity; 36, cylinder body; 361, air inlet passage; 37, end cover; 371, end cover communication passage; 38, one-way valve; 39, temperature sensor; 40, motion assembly; 41, piston connecting rod; 42, communication passage; 43, sealing device; 44, pressure head; 441, through hole; 45, leather cup; 46, driving mechanism; A, first direction; B, second direction. DETAILED DESCRIPTION

[0049] In the related art, the compression unit and the drying and filtering unit have a complex structure, high cost, low reliability, and low utilization rate of internal space of the air supply device.

[0050] Embodiments of the present disclosure are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary. Some embodiments of the present disclosure are described below with reference to the accompanying drawings, and a filtering unit 10 includes a housing 11, a desiccant 12, and a pressure relief device 20.

[0051] As shown in FIGS. 1 and 4, the filtering unit 10 is suitable for an air suspension system (i.e., an air suspension system), and the housing 11 has a cavity formed therein. The desiccant 12 is disposed in the cavity. The pressure relief device 20 is disposed on the housing 11, and the pressure relief device 20 has a pressure relief port 22 formed thereon. The pressure relief port 22 is in communication with the cavity, and when the pressure relief port 22 is opened, the air flow is adapted to flow through the desiccant 12 and be discharged to the outside atmosphere through the pressure relief port 22.

[0052] In combination with FIGS. 1 and 4, the desiccant 12 is installed inside the housing 11, and the desiccant 12 is configured to physically or chemically filter the fluid flowing therethrough to remove impurities and moisture in the fluid to achieve the effects of purification and drying. The pressure relief device 20 is provided with the pressure relief port 22, and the cavity of the filtering unit 10 is adapted to be in communication with the air suspension system. When the internal pressure of the air suspension system exceeds a set threshold value, part of the fluid in the air suspension system enters the cavity of the filtering unit 10. At this time, the pressure relief device 20 is started, and the pressure relief port 22 is opened, so that part of the fluid is discharged from the pressure relief port 22 to release the excessive pressure, thereby preventing the housing 11 from being broken or damaging the internal components.

[0053] In some embodiments of the present disclosure, the housing 11 serves as the main frame of the entire filtering unit 10, and plays a role of accommodating internal components and forming a fluid passage. When an abnormally high pressure is encountered, the pressure relief device 20 can relieve the internal pressure by opening the pressure relief port 22 to protect the equipment from damage and also ensure the safety of the operating environment. It can be understood that the main role of the pressure relief device 20 is to prevent the pressure in the housing 11 from being too high. In addition, since the desiccant 12 is directly disposed in the housing 11, an additional desiccant housing is not required, which makes the filtering unit 10 have fewer parts, high integration, and is also conducive to improving the space utilization of the entire filtering unit 10, increasing the capacity of the desiccant 12, and reducing the production cost of the filtering unit 10. The pressure relief port 22 is provided on the pressure relief device 20, which at least makes the structure of the housing 11 simple, can improve the reliability of the entire filtering unit 10, and prolong the service life of the filtering unit 10.

[0054] In some embodiments, as shown in FIGS. 4-6, the pressure relief device 20 includes a pressure relief pipe 21 having a first end with a pressure relief port 22, when the pressure relief port 22 is opened, the flow of the fluid passing through the desiccant 12 and entering the pressure relief pipe 21 through a second end of the pressure relief pipe 21, and is discharged to the external atmosphere through the pressure relief port 22.

[0055] In some embodiments, the pressure relief device 20 has a first direction A, and the pressure relief pipe 21 extends along the first direction A of the pressure relief device 20, so that the fluid in the housing 11 can flow through the desiccant 12 and then enter the pressure relief pipe 21, and be discharged to the external atmosphere through the pressure relief port 22, to release the excessive pressure inside the housing 11.

[0056] In this way, by providing the pressure relief pipe 21, the fluid in the housing 11 can flow through the desiccant 12 and then enter the pressure relief pipe 21, and the fluid flowing through the desiccant 12 can take away part of the moisture in the desiccant 12, to prolong the service life of the desiccant 12, and the structure of the pressure relief pipe 21 is simple, which is conducive to improving the space utilization rate inside the pressure relief device 20.

[0057] In some embodiments, as shown in FIGS. 4-6, the housing 11 is formed with an inlet 111 and an outlet 112, the inlet 111 and the outlet 112 are respectively located at two ends of the housing 11, and the desiccant 12 is located between the inlet 111 and the outlet 112. The second end of the pressure relief pipe 21 is located on the side where the inlet 111 is located, and the first end of the pressure relief pipe 21 is located on the side where the outlet 112 is located.

[0058] The housing 11 is provided with an inlet 111 and an outlet 112, the inlet 111 is configured to receive the fluid to be filtered (for example, it can be air), so that the fluid can enter the housing 11 and flow to the desiccant 12 for filtering treatment. The outlet 112 is configured to discharge the fluid purified by the desiccant 12, and deliver the fluid to the downstream equipment or system. The desiccant 12 is located on the fluid path between the inlet 111 and the outlet 112, for example, the inlet 111 of the housing 11 is formed at the first end of the housing 11 along the first direction A of the pressure relief device 20, and the outlet 112 of the housing 11 is formed at the second end of the housing 11 along the first direction A of the pressure relief device 20. The second end of the pressure relief pipe 21 along the first direction A is arranged adjacent to the inlet 111 of the housing 11, and the first end of the pressure relief pipe 21 along the first direction A is arranged adjacent to the outlet 112 of the housing 11. In this way, when the air suspension system is inflated, the fluid enters the housing 11 from the inlet 111, flows through the desiccant 12, and then flows to the air suspension system from the outlet 112, to complete the inflation process of the air suspension system. When the air suspension system needs to be deflated or discharged, the fluid released by the air suspension system enters the filter unit 10 through the outlet 112, flows through the desiccant 12, enters the pressure relief pipe 21, and is discharged to the external atmosphere through the pressure relief port 22, to complete the deflation and discharge process of the air suspension system.

[0059] Thus, the layout that the inlet 111 and the outlet 112 are respectively located at two ends of the shell 11 and the desiccant 12 is located between the inlet 111 and the outlet 112 is conducive to the inflation process of the air suspension system and realizes efficient filtration of the fluid. The arrangement of the pressure relief device 20 also facilitates the deflation and air release process of the air suspension system, is conducive to optimizing the layout inside the filtration unit 10, improves the space utilization rate inside the filtration unit 10, and improves the reliability of the filtration unit 10.

[0060] In some embodiments, as shown in FIGS. 4-6, the pressure relief pipe 21 is at least partially arranged in the shell 11, and the inner wall of the shell 11 and the pressure relief pipe 21 define a containing space configured to contain the desiccant 12.

[0061] In this way, the desiccant 12 is fixedly installed in the containing space defined between the inner wall of the shell 11 and the pressure relief pipe 21, and the fluid to be filtered must pass through the desiccant 12 to continue to flow to other parts after entering the inside of the shell 11, ensuring that the fluid passing through the shell 11 will be processed by the desiccant 12, thereby guaranteeing the filtering effect of the filtration unit 10.

[0062] Thus, the containing space defined between the inner wall of the shell 11 and the pressure relief pipe 21 is configured to contain and fix the desiccant 12, and the pressure relief pipe 21 is arranged in the desiccant 12, thereby effectively utilizing the space inside the shell 11, making the filtration unit 10 more compact as a whole, and ensuring normal filtering operation and stable and efficient operation of the filtration unit 10.

[0063] In some embodiments, as shown in FIGS. 4-6, the desiccant 12 is in direct contact with the inner wall of the shell 11.

[0064] In this way, the desiccant 12 is in close contact with the inner wall of the shell 11, which is conducive to fixing and positioning the desiccant 12 inside the shell 11, ensures that the desiccant 12 will not be displaced or loosened during the working process due to factors such as fluid pressure or vibration, and is conducive to maintaining the filtering efficiency and stability of the desiccant 12. In addition, the direct contact of the desiccant 12 with the inner wall of the shell 11 can reduce or prevent unfiltered fluid from bypassing the desiccant 12 and directly flowing from the inlet 111 to the outlet 112 or from the outlet 112 to the pressure relief port 22, thereby ensuring the filtering effect and the overall sealing performance of the filtration unit 10. Furthermore, the direct contact of the desiccant 12 with the inner wall of the shell 11 can also eliminate the need for an additional support frame or fixing structure, thereby simplifying the internal structure of the filtration unit 10, reducing the weight, lowering the manufacturing cost, and being conducive to maintenance and replacement of the desiccant 12. The direct contact of the desiccant 12 with the inner wall of the shell 11 can also make the desiccant 12 have a larger volume and stronger filtering capacity.

[0065] Therefore, the direct contact of the desiccant 12 and the inner wall of the shell 11 not only helps to firmly install the desiccant 12 and improve the sealing performance, but also simplifies the structural design and optimizes the pressure distribution, and improves the filtering capacity of the filtering unit 10, thereby ensuring the reliable operation of the filtering unit 10 under various working conditions.

[0066] In some embodiments, as shown in FIGS. 4-6, the desiccant 12 includes a first hole plate 121, a second hole plate 122, and a desiccant body 123. The first hole plate 121 is arranged adjacent to the inlet 111. The second hole plate 122 is arranged adjacent to the outlet 112. The desiccant body 123 is arranged between the first hole plate 121 and the second hole plate 122, and the pressure relief pipe 21 is arranged through the first hole plate 121, the desiccant body 123, and the second hole plate 122.

[0067] The first hole plate 121 is located on the side of the desiccant 12 close to the inlet 111, and the second hole plate 122 is located on the side of the desiccant 12 close to the outlet 112. The first hole plate 121 functions to preliminarily guide and distribute the fluid before the fluid enters the desiccant body 123, ensuring that the fluid is uniformly distributed on the surface of the desiccant body 123. A plurality of through holes are respectively formed on the first hole plate 121 and the second hole plate 122. The plurality of through holes penetrate the first hole plate 121 along the thickness direction of the first hole plate 121, and the plurality of through holes penetrate the second hole plate 122 along the thickness direction of the second hole plate 122. Except for the pressure relief pipe 21, the airflow enters the desiccant body 123 through the plurality of through holes on the first hole plate 121, and flows out through the plurality of through holes on the second hole plate 122 after being filtered by the desiccant body 123.

[0068] Therefore, the arrangement of the first hole plate 121 and the second hole plate 122 can provide certain support to the desiccant body 123, ensuring the firm installation of the desiccant 12 in the shell 11. Moreover, the arrangement of the first hole plate 121 and the second hole plate 122 is conducive to the uniform flow of the fluid through the desiccant body 123, thereby improving the filtering effect of the filtering unit 10 on the fluid and ensuring the reliability and efficiency of the filtering process. In some embodiments, the first hole plate 121 and the second hole plate 122 can be fixed on the pressure relief pipe 21.

[0069] In some embodiments, as shown in FIGS. 4-6, the first hole plate 121 and the corresponding inner wall of the shell 11 are spaced apart from each other to define a first communication cavity 124. The inlet 111 and the second end of the pressure relief pipe 21 adjacent to the inlet 111 respectively communicate with the first communication cavity 124.

[0070] The first orifice plate 121 is spaced apart from the corresponding inner wall of the housing 11 by a first communication cavity 124. The first communication cavity 124 can act as a small buffer zone to help regulate the transition of fluid from the inlet 111 to the desiccant body 123, reducing fluid impact, especially in the case of high pressure input, and smoothing the fluid pressure to protect the desiccant body 123 from instantaneous high pressure. The first communication cavity 124, as a transition zone between the inlet 111 and the desiccant body 123, can more evenly distribute the incoming fluid. When fluid enters from the inlet 111, it will first fill the first communication cavity 124, and then be evenly dispersed onto the desiccant body 123 through the multiple through-holes on the first orifice plate 121, thereby ensuring that every part of the surface of the desiccant 12 is fully utilized to improve filtration efficiency.

[0071] In some embodiments, as shown in FIGS. 4-6, the second orifice plate 122 is spaced apart from the corresponding inner wall of the housing 11 to define a second communication cavity 125, and the outlet 112 is in communication with the second communication cavity 125.

[0072] The second orifice plate 122 is spaced apart from the corresponding inner wall of the housing 11 by a second communication cavity 125. The second communication cavity 125, as a transition zone between the desiccant body 123 and the outlet 112, can collect the fluid filtered from the desiccant body 123, ensuring that the fluid is evenly distributed within the second communication cavity 125 before leaving the housing 11, thereby being smoothly and evenly discharged to the downstream system or environment through the outlet 112. The second communication cavity 125 helps to balance the pressure difference between the desiccant body 123 and the outlet 112. When fluid enters the second communication cavity 125 from the desiccant body 123, the space inside the cavity can temporarily store the fluid to alleviate sudden pressure changes and ensure smooth passage of the fluid through the outlet 112.

[0073] In some embodiments, as shown in FIGS. 4-6, the pressure relief pipe 21 is an integrally injection molded part with the housing 11.

[0074] Integrally injection molding ensures a seamless connection between the pressure relief pipe 21 and the housing 11, eliminating the risk of leakage that may be caused by traditional welding or bonding methods, and improving the sealing and structural strength of the entire filtration unit 10. In addition, integrally injection molding reduces the steps of subsequent assembly, reduces manufacturing costs and production time, eliminates the need for separate production of the pressure relief pipe 21 for assembly, simplifies the complexity of the production line, and improves production efficiency.

[0075] In some embodiments, as shown in FIGS. 3 and 4, the pressure relief device 20 includes a pressure relief valve 23 disposed at the pressure relief port 22, the pressure relief valve 23 being configured to open and close the pressure relief port 22.

[0076] The pressure relief valve 23 can be opened or closed automatically or manually by an operator according to the internal pressure of the filter unit 10, external instructions or other control signals. When the air suspension system is inflated, the pressure relief valve 23 remains closed to prevent the fluid inside the housing 11 from being directly discharged to the external atmosphere through the pressure relief port 22. The filtered fluid enters the housing 11 from the inlet 111, passes through the desiccant 12 for purification treatment, and is output to the downstream air suspension system from the outlet 112 of the housing 11. When the air suspension system needs to be deflated or vented, the pressure relief valve 23 is opened under the action of fluid pressure, allowing part or all of the fluid inside the housing 11 to be quickly discharged to the external atmosphere through the pressure relief port 22, thereby achieving the effect of pressure relief.

[0077] Thus, the provision of the pressure relief valve 23 enables precise control of the opening and closing of the pressure relief port 22, so that the filter unit 10 can quickly and effectively release excessive internal pressure when needed, while maintaining good sealing performance under normal working conditions to avoid fluid leakage. This design improves the pressure management capability and operating efficiency of the filter unit 10, and enhances the adaptability and reliability of the filter unit 10 under complex working conditions.

[0078] In some embodiments, as shown in FIGS. 4-6, the pressure relief valve 23 includes a pressure relief housing 24, a partition 26 is provided inside the pressure relief housing 24 to divide the pressure relief housing 24 into a first chamber 27 and a second chamber 28, and the pressure relief port 22 is in communication with the first chamber 27 and can be opened and closed. The discharge port 271 is formed on the first chamber 27 and is adapted to communicate with the external atmosphere. The pressure relief housing 24 constitutes the main structure of the pressure relief valve 23, and the interior of the pressure relief housing 24 is divided into two chambers by the partition 26.

[0079] In this way, the first chamber 27 is connected to the pressure relief port 22, and when the pressure relief valve 23 is opened, the fluid will first enter the first chamber 27. The discharge port 271 is formed on the first chamber 27 and directly communicates with the external atmosphere, thereby enabling the fluid in the first chamber 27 to be discharged to the external environment.

[0080] Thus, the pressure relief housing 24 constitutes the main structure of the pressure relief valve 23, and the pressure relief housing 24 can ensure the sealing performance and structural stability of the entire pressure relief device 20. The provision of the partition 26 to divide the pressure relief housing 24 into the first chamber 27 and the second chamber 28 helps to achieve more precise fluid control and pressure management.

[0081] In some embodiments, as shown in FIGS. 4-6, the pressure relief valve 23 further comprises a pressure relief movable rod 25 penetrating through the partition plate 26. One end of the pressure relief movable rod 25 located in the first chamber 27 is provided with a pressure relief plug 251 configured to block or open the pressure relief port 22. The other end of the pressure relief movable rod 25 located in the second chamber 28 is provided with a movable plate 252 separating the second chamber 28 into a first sub-chamber 281 and a second sub-chamber 282. The first sub-chamber 281 is switchably communicated with the outlet 112 and the second sub-chamber 282, and when the first sub-chamber 281 is communicated with the outlet 112, the pressure relief movable rod 25 drives the pressure relief plug 251 to open the pressure relief port 22.

[0082] Thus, the pressure relief movable rod 25 penetrates through the partition plate 26, the first end of the pressure relief movable rod 25 is connected with the pressure relief plug 251 located in the first chamber 27, the pressure relief plug 251 is detachably matched with the pressure relief port 22, and the second end of the pressure relief movable rod 25 is connected with the movable plate 252 located in the second chamber 28 and separating the second chamber 28 into the first sub-chamber 281 and the second sub-chamber 282. The pressure relief movable rod 25 is movable in the first direction A of the pressure relief device 20 relative to the partition plate 26 in the pressure relief housing 24, and drives the pressure relief plug 251 and the movable plate 252 to move in the first chamber 27 and the second chamber 28, respectively, to realize the opening and closing of the pressure relief port 22. When the pressure relief plug 251 is in the closed position, the fluid inside the housing 11 can be effectively blocked from being discharged through the pressure relief port 22. When the pressure relief plug 251 is opened, the fluid inside the housing 11 is allowed to enter the first chamber 27 through the pressure relief port 22 and be discharged to the outside atmosphere through the discharge port 271 of the first chamber 27. In some embodiments, the discharge port 271 is adapted to be communicated with a return air pipe 272 communicated with an air inlet chamber of an air pump, and the gas entering the air inlet chamber of the air pump is discharged to the outside atmosphere through an air outlet pipe of the air pump.

[0083] Thus, the pressure relief valve 23 realizes the precise control of the pressure relief port 22 through the cooperative work of the pressure relief movable rod 25, the pressure relief plug 251 and the movable plate 252, ensures that the pressure relief function can be effectively realized when needed, and also can maintain good sealing performance in the normal filtering state.

[0084] In some embodiments, as shown in FIGS. 4-6, the pressure relief valve 23 further comprises a switching valve 231, and the first sub-chamber 281 is switchably communicated with the outlet 112 and the second sub-chamber 282 through the switching valve 231.

[0085] During the process of inflating or deflating the air suspension system, the switching valve 231 blocks the communication between the first sub-cavity 281 and the outlet 112 of the housing 11, and opens the communication between the first sub-cavity 281 and the second sub-cavity 282. During the process of deflating the air suspension system, the switching valve 231 opens the communication between the first sub-cavity 281 and the outlet 112 of the housing 11, and blocks the communication between the first sub-cavity 281 and the second sub-cavity 282. In this way, the switching valve 231 is configured to control the flow path of the fluid, so as to control the working state of the filtering unit 10, thereby improving the reliability of the filtering unit 10.

[0086] In some embodiments, as shown in FIGS. 4-6, when the pressure at the outlet 112 reaches the predetermined pressure threshold, the pressure relief plug 251 opens the pressure relief port 22.

[0087] In normal filtering operation, the pressure relief plug 251 blocks the pressure relief port 22, and the filtered fluid enters the housing 11 from the inlet 111 of the housing 11, passes through the desiccant 12 for drying treatment, and the treated fluid is output from the outlet 112 of the housing 11 to the downstream system. At this time, the pressure inside the housing 11 is kept within a safe range, and the pressure relief does not need to be started. When the pressure at the outlet 112 of the housing 11 reaches the predetermined pressure threshold, the fluid inside the housing 11 enters the pressure relief pipe 21 to the pressure relief port 22, and the fluid pushes the pressure relief plug 251 to move in the first direction A of the pressure relief device 20 away from the pressure relief port 22, so that the pressure relief port 22 is opened. At this time, the fluid enters the first chamber 27, and is discharged to the outside atmosphere through the discharge port 271 on the first chamber 27, so as to reduce the pressure at the outlet 112 of the housing 11. When the pressure at the outlet 112 is reduced to below the predetermined pressure threshold, the pressure relief plug 251 resets and blocks the pressure relief port 22 again.

[0088] In this way, when the pressure at the outlet 112 reaches the predetermined pressure threshold, the fluid in the housing 11 can push the pressure relief plug 251 to automatically open the pressure relief port 22, so that the filtering unit 10 can timely and effectively release the internal pressure when the pressure at the outlet 112 is too high, thereby ensuring the safety and stability of the filtering unit 10 during operation.

[0089] In some embodiments, as shown in FIGS. 4-6, when the pressure relief port 22 is closed, the first sub-cavity 281 and the second sub-cavity 282 are in communication.

[0090] The movable plate 252 divides the second chamber 28 into the first sub-cavity 281 and the second sub-cavity 282, and when the pressure relief port 22 is closed, the first sub-cavity 281 and the second sub-cavity 282 are in communication to balance the pressure between the first sub-cavity 281 and the second sub-cavity 282, so that the movable plate 252 is at the preset position.

[0091] Thus, when the pressure relief port 22 is closed, the communication between the first sub-cavity 281 and the second sub-cavity 282 can improve the stability and reliability of the pressure relief device 20.

[0092] In some embodiments, as shown in FIGS. 4-6, the pressure relief valve 23 further comprises an elastic member 29 abutting between the movable plate 252 and the inner wall of the second sub-cavity 282.

[0093] The elastic member 29 extends along the first direction A of the pressure relief device 20, the first end of the elastic member 29 along the first direction A abuts against the side surface of the movable plate 252 facing the second sub-cavity 282, and the second end of the elastic member 29 along the first direction A abuts against the inner wall of the second sub-cavity 282 opposite to the movable plate 252. The elastic member 29 can push the movable plate 252 in a direction towards the pressure relief port 22, so that the pressure relief plug 251 can block the pressure relief port 22. When the pressure at the outlet 112 of the shell 11 reaches a predetermined pressure threshold, i.e., when the fluid pressure is greater than the force F1 exerted by the elastic member 29 on the movable plate 252, the fluid pushes the pressure relief plug 251 to move in a direction away from the pressure relief port 22 to open the pressure relief port 22 to release the pressure inside the shell 11. When the fluid pressure is less than the force F1 exerted by the elastic member 29 on the movable plate 252, the elastic member 29 pushes the movable plate 252 to block the pressure relief port 22 by the pressure relief plug 251.

[0094] Thus, during the inflation process of the air suspension system, the pressure relief valve 23 is in a closed state under the action of the elastic member 29, and the pressure relief plug 251 blocks the pressure relief port 22. When the pressure at the outlet 112 reaches the preset pressure threshold, the fluid pressure pushes the pressure relief plug 251 and the pressure relief movable rod 25 to overcome the pushing force of the elastic member 29, open the pressure relief port 22 for pressure relief. After the pressure relief is completed, the elastic member 29 automatically drives the pressure relief movable rod 25 to reset, closes the pressure relief port 22, and restores the filtration operation. The setting of the elastic member 29 can make the filtration unit 10 open when the pressure at the outlet 112 of the shell 11 is too large, so as to timely release the internal pressure, and automatically restore after the pressure decreases, thereby improving the automation degree and operation reliability of the filtration unit 10.

[0095] Some embodiments of the present disclosure also provide an air supply device 100, as shown in FIGS. 3-6, which comprises a compression unit 30 and the above-mentioned filtration unit 10, and the inlet 111 of the filtration unit 10 is in communicable connection with the second compression cavity 34.

[0096] The compression unit 30 is configured to compress external air to a required pressure level for use by the air suspension system, and the filtration unit 10 is configured to purify the compressed air generated by the compression unit 30 to remove impurities and particles in the compressed air, so as to ensure that the air entering the air suspension system is clean, thereby protecting the air suspension system from pollution and prolonging its service life.

[0097] The air supply device 100 of some embodiments of the present disclosure realizes continuous air suction, compression, purification and output by integrating the compression unit 30 and the filtering unit 10, ensuring the high quality and high pressure of the supplied air.

[0098] In some embodiments, as shown in FIGS. 3-6, the compression unit 30 includes a cylinder body 31 and a moving assembly 40, the cylinder body 31 is formed with an air inlet 32, and the moving assembly 40 is movably arranged in the cylinder body 31. The moving assembly 40 divides the cylinder body 31 into a first compression cavity 33 and a second compression cavity 34, the first compression cavity 33 is in communication with the air inlet 32, and the second compression cavity 34 is in communication with the first compression cavity 33 through the moving assembly 40.

[0099] In combination with FIGS. 1 and 4, the cylinder body 31 serves as the main structure of the compression unit 30, and plays a role in containing and protecting the moving assembly 40. The compression unit 30 has a second direction B, and the moving assembly 40 reciprocates in the cylinder body 31 along the second direction B to realize air compression and output, and divides the cylinder body 31 into two different compression cavities. The second compression cavity 34 is in communication with the first compression cavity 33 through the moving assembly 40, and the moving assembly 40 opens or closes the passage between the first compression cavity 33 and the second compression cavity 34 during movement. The first compression cavity 33 is in communication with the air inlet 32 to facilitate air entering the first compression cavity 33 from the air inlet 32. When the moving assembly 40 is in a certain specific condition, the passage between the first compression cavity 33 and the second compression cavity 34 is opened, and air enters the second compression cavity 34 from the first compression cavity 33. When the inlet 111 of the filtering unit 10 is in communication with the second compression cavity 34, air enters the filtering unit 10 from the second compression cavity 34 to realize air filtration and purification.

[0100] In this way, the compression unit 30 realizes air compression through the reciprocating movement of the moving assembly 40, while the filtering unit 10 can efficiently filter the compressed air and supply the filtered air to the downstream system to realize air charging of the air suspension system downstream, and complete the air suspension system deflation and air release process through the filtering unit 10, thereby improving the reliability and stability of the air supply device 100.

[0101] In some embodiments, as shown in FIGS. 3-6, the cylinder body 31 is provided with a containing cavity 35 configured to contain the moving assembly 40, and the pressure relief port 22 and the air inlet 32 are respectively in communication with the containing cavity 35.

[0102] In this way, the cylinder body 31 defines the accommodation cavity 35 which not only provides accommodation space for the moving assembly 40, but also communicates with the pressure relief port 22 and the air inlet port 32 to participate in the air flow path. The communication between the pressure relief port 22 and the accommodation cavity 35 facilitates the discharge of air in the accommodation cavity 35 to the external atmosphere through the pressure relief port 22 when pressure relief is required, thereby achieving the effect of rapid pressure relief.

[0103] In this way, the cylinder body 31 defines the accommodation cavity 35 which not only provides accommodation space for the moving assembly 40, but also communicates with the pressure relief port 22 and the air inlet port 32 to participate in the air flow path. The communication between the pressure relief port 22 and the accommodation cavity 35 facilitates the discharge of air in the accommodation cavity 35 to the external atmosphere through the pressure relief port 22 when pressure relief is required, thereby achieving the effect of rapid pressure relief.

[0104] In some embodiments, as shown in FIGS. 3-6, the cylinder body 31 is formed with an airflow passage which is configured to allow gas to enter the first compression cavity 33 from the air inlet port 32.

[0105] The airflow passage is a passage inside the cylinder body 31 which is configured to guide air to flow smoothly from the air inlet port 32 into the first compression cavity 33. In this way, by providing the airflow passage on the cylinder body 31, it is possible to avoid providing a flow channel from the air inlet port 32 to the first compression cavity 33 on the moving assembly 40, so that the moving assembly 40 is simple to manufacture and the precision is easy to guarantee, and the compression unit 30 can more effectively control and guide the flow of air, thereby improving the efficiency of the compression process and the stability of the air supply device 100.

[0106] In some embodiments, as shown in FIGS. 3-6, the cylinder body 31 includes a cylinder body 36 and an end cover 37, the end cover 37 and the cylinder body 36 together enclose the accommodation cavity 35, and the airflow passage includes an end cover communication passage 371 formed on the end cover 37. The cylinder body 36 is open on the lower side along the second direction B, and the end cover 37 is arranged on the side of the cylinder body 36 which is open along the second direction B, and the cylinder body 36 cooperates with the end cover 37 to define the accommodation cavity 35 together. It should be noted that the end cover communication passage 371 is a special passage formed on the end cover 37, and the end cover communication passage 371 is configured to guide air to enter the first compression cavity 33 from the air inlet port 32.

[0107] In this way, the separate design of the cylinder body 36 and the end cover 37 makes the manufacturing and maintenance of the cylinder body 31 more convenient, and the disassembly of the end cover 37 can easily realize the inspection and maintenance of the moving assembly 40. The provision of the end cover communication passage 371 helps to optimize the gas flow path, facilitating the entry of gas from the air inlet port 32 into the first compression cavity 33, so that the compression unit 30 can achieve more efficient and stable air flow control.

[0108] In some embodiments, as shown in FIGS. 3-6, the air flow passage further comprises an air inlet passage 361 formed on the cylinder body 36, the air inlet passage 361 being in communication with the air inlet port 32 and the end cover communication passage 371, respectively. The end cover communication passage 371 on the end cover 37 is in communication with the air inlet passage 361, and the end cover communication passage 371 is in communication with the first compression chamber 33. The first compression chamber 33 is adapted to be in communication with the air inlet passage 361 through the end cover communication passage 371, and the air in the air inlet passage 361 can enter the first compression chamber 33 through the end cover communication passage 371. The air inlet passage 361 is in communication with the air inlet port 32. In this way, external air can enter the air inlet passage 361 inside the cylinder body 36 through the air inlet port 32, and the air in the air inlet passage 361 can enter the first compression chamber 33 through the end cover communication passage 371.

[0109] In this way, by designing the air inlet passage 361 on the cylinder body 36 and connecting the air inlet passage 361 with the air inlet port 32 and the end cover communication passage 371, the compression unit 30 can more efficiently introduce external air into the first compression chamber 33, so that the compression unit 30 can achieve more efficient and stable air flow control and management, which not only improves the efficiency of air compression, but also improves the performance and reliability of the entire air supply device 100.

[0110] In some embodiments, as shown in FIGS. 3-6, the cylinder body 31 further comprises a one-way valve 38 adapted to be disposed in the air flow passage, the one-way valve 38 being configured to allow fluid flowing through the one-way valve 38 to flow unidirectionally to the first compression chamber 33.

[0111] The one-way valve 38 functions to ensure that air can only enter the first compression chamber 33 from the external environment through the air inlet port 32, and cannot flow in the opposite direction. In this way, during the compression process, when the moving assembly 40 compresses air, the pressure in the first compression chamber 33 will rise. If there is no one-way valve 38, the pressurized air may flow back to the air inlet passage 361 or the external environment, resulting in reduced compression efficiency and energy waste. The one-way valve 38 prevents this reverse flow phenomenon, ensuring the continuity and efficiency of the compression process.

[0112] In some embodiments, as shown in FIGS. 3-6, the one-way valve 38 is disposed at one end of the end cover communication passage 371 that is in communication with the first compression chamber 33.

[0113] The one-way valve 38 functions to ensure that fluid flows unidirectionally from the end cover communication passage 371 to the first compression chamber 33, preventing reverse flow. The air inlet port 32, the air inlet passage 361, the end cover communication passage 371, and the one-way valve 38 together form a complete air flow path, ensuring that external air can enter the first compression chamber 33.

[0114] Therefore, the one-way valve 38 is installed at the end of the end cover communication channel 371 communicating with the first compression cavity 33, which ensures the positive flow of air, improves the compression efficiency, reduces the air suspension system loss, simplifies the air suspension system design, and also enhances the safety and reliability of the air suspension system.

[0115] In some embodiments, as shown in FIGS. 1-3, the air supply device 100 further comprises a temperature sensor configured to collect the temperature of the gas in the first compression cavity 33, and the temperature sensor is arranged on the end cover 37. It can be understood that the end cover 37 is located at the junction between the inside of the cylinder body 31 and the external environment, and the temperature sensor 39 at this position can effectively monitor the air temperature inside the cylinder body 31 (especially near the first compression cavity 33) or monitor the temperature of the surface of the end cover 37, which indirectly reflects the thermal conditions of the working state inside the cylinder body 31.

[0116] Therefore, the arrangement of the temperature sensor 39 facilitates the air supply device 100 to monitor the temperature inside the cylinder body 31 or the surface of the end cover 37 in real time, which provides important data support for the operation state monitoring, fault early warning and efficiency optimization of the air supply device 100, and helps to improve the overall performance and service life of the device.

[0117] In some embodiments, as shown in FIGS. 1-6, the air supply device 100 further comprises a driving mechanism 46 connected to the motion assembly 40 to drive the motion assembly 40 to move relative to the cylinder body 31.

[0118] For example, the driving mechanism 46 can drive the motion assembly 40 to move relative to the cylinder body 31 in the second direction B to realize the compression of air. The pressure relief port 22 is in communication with the containing cavity 35 through the inside of the driving mechanism 46. Or, the pressure relief port 22 is in communication with the containing cavity 35 and the inside of the driving mechanism 46, respectively. In this way, when the air supply device 100 needs to be relieved, the high-pressure air in the containing cavity 35 or the inside of the driving mechanism 46 can be directly discharged to the outside atmosphere through the pressure relief port 22, so as to realize the rapid release of pressure.

[0119] Therefore, the driving mechanism 46 provides power for the movement of the motion assembly 40, and the driving mechanism 46 can drive the motion assembly 40 to reciprocate, so that the air supply device 100 can repeat the above-mentioned process of air suction, compression, discharge and filtration, and the air supply device 100 can also adjust the pressure through the pressure relief port 22 as needed. In this way, a complete air compression and discharge system is constructed, which improves the air flow efficiency inside the air supply device 100 and ensures the stable and safe operation of the air supply device 100.

[0120] In some embodiments, as shown in FIG. 3, FIG. 6, FIG. 7 and FIG. 8, the motion assembly 40 comprises a piston rod 41 movably arranged in the cylinder 31, and a sealing device 43. The piston rod 41 separates the cylinder 31 into a first compression chamber 33 and a second compression chamber 34. A communication passage 42 is formed in the piston rod 41, and the second compression chamber 34 is in communication with the first compression chamber 33 through the communication passage 42. The sealing device 43 is arranged between the end of the piston rod 41 adjacent to the second compression chamber 34 and the inner wall of the cylinder 31.

[0121] The piston rod 41 is driven by the driving mechanism 46 to reciprocate in the second direction B. The communication passage 42 is formed in the piston rod 41 and extends in the second direction B. The first end of the communication passage 42 in the second direction B is in communication with the first compression chamber 33. The second end of the communication passage 42 in the second direction B is adapted to be in communication with the second compression chamber 34. A one-way valve 38 is arranged at the second end of the communication passage 42 in communication with the second compression chamber 34, and is configured to allow fluid to flow from the first compression chamber 33 to the second compression chamber 34 in one direction. The second compression chamber 34 is in communication with the inlet 111 of the filtering unit 10, so that the compressed air in the second compression chamber 34 can enter the filtering unit 10. In some embodiments, a one-way valve 38 is arranged at the position where the second compression chamber 34 is in communication with the inlet 111 of the filtering unit 10, so that fluid can flow from the second compression chamber 34 to the filtering unit 10 in one direction.

[0122] In this way, the piston rod 41 is movably arranged in the cylinder 31 to compress air. The communication passage 42 formed in the piston rod 41 allows air in the first compression chamber 33 to enter the second compression chamber 34, so that air can flow in an orderly manner and be compressed efficiently. The sealing device 43 is arranged to ensure a gap between the piston rod 41 and the inner wall of the cylinder 31, so that the gap can maintain good sealing during movement and prevent compressed air from leaking from the second compression chamber 34 to the first compression chamber 33 or outside the cylinder 31 during movement of the piston rod 41, thereby avoiding affecting the compression efficiency and the performance of the device.

[0123] In some embodiments, as shown in FIG. 6 and FIG. 7, the sealing device 43 comprises a pressure head 44 and a leather cup 45. The pressure head 44 is arranged at the end of the piston rod 41 adjacent to the second compression chamber 34. A through hole 441 is formed in the pressure head 44, and the second compression chamber 34 is adapted to communicate with the communication passage 42 through the through hole 441. The leather cup 45 is arranged between the pressure head 44 and the piston rod 41, and is located between the pressure head 44 and the inner wall of the cylinder 31.

[0124] Thus, the pressure head 44 is formed with a through hole 441, which is in communication with the communication channel 42, facilitating the communication between the second compression chamber 34 and the first compression chamber 33. The leather cup 45 is arranged between the pressure head 44 and the piston connecting rod 41, and serves as a flexible sealing element, which can fill the gap between the pressure head 44 and the inner wall of the cylinder 31 through its deformation during the movement of the piston connecting rod 41, forming an effective seal, preventing the compressed air from leaking from the second compression chamber 34 to the first compression chamber 33 or the outside of the cylinder 31 during the movement of the piston connecting rod 41, and ensuring the efficiency of the compression process and the performance of the equipment.

[0125] Thus, the sealing device 43 forms an efficient and reliable sealing system through the cooperation of the pressure head 44 and the leather cup 45. The pressure head 44 ensures the stable connection between the communication channel 42 and the second compression chamber 34, and the leather cup 45 realizes the effective seal between the pressure head 44 and the inner wall of the cylinder 31 through its deformation, greatly reducing the leakage loss and improving the compression efficiency and overall performance of the equipment.

[0126] As shown in FIG. 9, some embodiments of the present disclosure also provide an air suspension system 200, which comprises the air supply device 100 described above. The air suspension system 200 is adapted to be in communication with the outlet 112 of the filter unit 10 of the air supply device 100, and has three working states of inflation, deflation and deflation. The principles of the three working states of the air suspension system 200 are as follows.

[0127] When the air suspension system 200 is in the inflation state, in combination with FIG. 4, the driving mechanism 46 drives the piston connecting rod 41 to move upward in the second direction B, and the volume of the first compression chamber 33 increases, and the pressure inside the first compression chamber 33 decreases. The one-way valve 38 at the end of the end cover communication channel 371 connected to the first compression chamber 33 is opened, and the gas is sucked into the first compression chamber 33 through the inlet 111, the gas inlet 361 and the end cover communication channel 371. The driving mechanism 46 drives the piston connecting rod 41 to move downward in the second direction B, and the one-way valve 38 at the end of the end cover communication channel 371 connected to the first compression chamber 33 is closed, the volume of the first compression chamber 33 decreases, the air is compressed, and the pressure inside the first compression chamber 33 increases. When the pressure inside the first compression chamber 33 is greater than the pressure inside the second compression chamber 34, the one-way valve 38 at the second end of the communication channel 42 is opened, and the compressed gas in the first compression chamber 33 enters the second compression chamber 34 through the communication channel 42. When the pressure inside the second compression chamber 34 is again greater than the pressure inside the first compression chamber 33, the one-way valve 38 at the second end of the communication channel 42 is closed.

[0128] The driving mechanism 46 drives the piston connecting rod 41 to move upward along the second direction B, and the gas in the second compression cavity 34 is compressed again. When the pressure in the second compression cavity 34 reaches the opening value of the one-way valve 38 arranged at the position where the second compression cavity 34 communicates with the inlet 111 of the filter unit 10, the one-way valve 38 opens. The compressed gas in the second compression cavity 34 enters the inside of the shell 11 of the filter unit 10 through the inlet 111 of the shell 11 of the filter unit 10. After the gas is filtered and dried by the desiccant 12, it enters the air suspension system 200 through the outlet 112 of the shell 11, and the air charging process of the air suspension system 200 is completed. At this time, the pressure relief port 22 is in a normally closed state under the action of the pressure relief valve 23, and the first sub-cavity 281 and the second sub-cavity 282 in the pressure relief valve 23 are in communication, and the first sub-cavity 281 is blocked from the outlet 112.

[0129] When the air suspension system 200 is in the deflation state, in combination with FIG. 5, the one-way valve 38 arranged at the position where the second compression cavity 34 communicates with the inlet 111 of the filter unit 10 is in a closed state, and the gas of the air suspension system 200 enters the inside of the shell 11 of the filter unit 10 through the outlet 112 of the shell 11 of the filter unit 10. After the high-pressure gas passes through the desiccant 12, it enters the pressure relief pipe 21 and exerts a certain force F2 on the pressure relief plug 251 of the pressure relief valve 23. When the force F2 exerted by the high-pressure gas on the pressure relief plug 251 is greater than the force F1 exerted by the elastic member 29 on the movable plate 252, the pressure relief plug 251 moves along the first direction A towards the direction away from the pressure relief port 22 to open the pressure relief port 22. The high-pressure gas enters the first cavity 27, and then enters the air pump through the discharge port 271 and the air return pipe 272 on the first cavity 27, and is discharged to the outside atmosphere through the air inlet pipe of the air pump, and the deflation process of the air suspension system 200 is completed. At this time, the first sub-cavity 281 and the second sub-cavity 282 in the pressure relief valve 23 are in communication, and the first sub-cavity 281 is blocked from the outlet 112.

[0130] When the air suspension system 200 is in the deflation state, in combination with FIG. 6, the one-way valve 38 arranged at the position where the second compression chamber 34 communicates with the inlet 111 of the filter unit 10 is in the closed state, the first sub-chamber 281 and the second sub-chamber 282 in the pressure relief valve 23 are blocked, and the first sub-chamber 281 communicates with the outlet 112. The gas released by the air suspension system 200 enters the inside of the shell 11 of the filter unit 10 through the outlet 112 of the shell 11 of the filter unit 10. At this time, part of the high-pressure gas directly enters the inside of the first sub-chamber 281 and exerts a certain force F3 on the movable plate 252, and part of the high-pressure gas enters the pressure relief pipe 21 after passing through the desiccant 12 and exerts a certain force F2 on the pressure relief plug 251 of the pressure relief valve 23. When the sum of the force F3 exerted on the movable plate 252 and the force F2 exerted on the pressure relief plug 251 is greater than the force F1 exerted by the elastic member 29 on the movable plate 252, the pressure relief plug 251 moves in the first direction A away from the pressure relief port 22 to open the pressure relief port 22, the high-pressure gas enters the first chamber 27, and then enters the air pump through the discharge port 271 and the air return pipe 272 on the first chamber 27. The air pump discharges to the outside atmosphere through the air inlet pipe, and the deflation process of the air suspension system 200 is completed.

[0131] As shown in FIG. 10, some embodiments of the present disclosure also provide a vehicle 1000 comprising the air suspension system 200 described above.

[0132] The vehicle 1000 of some embodiments of the present disclosure, by applying the air suspension system 200 described in the above embodiments, has efficient air supply, precise pressure regulation, comprehensive fault monitoring and protection functions, and can significantly improve the comfort, adaptability and reliability of the vehicle 1000.

[0133] In the description of the present disclosure, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0134] In the description of the disclosure, "a first feature", "a second feature" can include one or more of the features. In the description of the disclosure, the meaning of "a plurality of" is two or more. In the description of the disclosure, a first feature "above" or "below" a second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. In the description of the disclosure, the first feature "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature.

[0135] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example.

[0136] Although the embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

A filter unit (10) suitable for an air suspension system, comprising: a housing (11) having a cavity formed therein; a desiccant (12) disposed in the cavity; and a pressure relief device (20) disposed on the housing (11), the pressure relief device (20) having a pressure relief port (22) formed thereon, the pressure relief port (22) being in communication with the cavity, and when the pressure relief port (22) is open, a flow of a gas is adapted to flow through the desiccant (12) and be discharged to an external atmosphere through the pressure relief port (22). The pressure relief device (20) comprises: The filter unit (10) according to claim 1, wherein a pressure relief pipe (21) having a first end with the pressure relief port (22), when the pressure relief port (22) is open, the flow of the gas flows through the desiccant (12) and enters the pressure relief pipe (21) through a second end of the pressure relief pipe (21) and is discharged to the external atmosphere through the pressure relief port (22). The housing (11) has an inlet (111) and an outlet (112) formed thereon, the inlet (111) and the outlet (112) are respectively located at two ends of the housing (11), and the desiccant (12) is located between the inlet (111) and the outlet (112). The filter unit (10) according to claim 2, wherein The second end of the pressure relief pipe (21) is located on a side where the inlet (111) is located, and the first end of the pressure relief pipe (21) is located on a side where the outlet (112) is located. The pressure relief pipe (21) is at least partially disposed in the housing (11), and an accommodation space configured to accommodate the desiccant (12) is defined between an inner wall of the housing (11) and an outer wall of the pressure relief pipe (21). The filter unit (10) according to claim 3, wherein The desiccant (12) is in contact with the inner wall of the housing (11). The filter unit (10) according to any one of claims 1-4, wherein The desiccant (12) comprises: The filter unit (10) according to claim 4, wherein a first perforated plate (121) disposed adjacent to the inlet (111); a second perforated plate (122) disposed adjacent to the outlet (112); and a desiccant body (123) disposed between the first perforated plate (121) and the second perforated plate (122), and the pressure relief pipe (21) is disposed through the first perforated plate (121), the desiccant body (123) and the second perforated plate (122). The first perforated plate (121) and the corresponding inner wall of the housing (11) are spaced apart from each other to define a first communication cavity (124), and the inlet (111) and the second end of the pressure relief pipe (21) adjacent to the inlet (111) are respectively in communication with the first communication cavity (124). The filter unit (10) according to claim 6, wherein The second perforated plate (122) and the corresponding inner wall of the housing (11) are spaced apart from each other to define a second communication cavity (125), and the outlet (112) is in communication with the second communication cavity (125). The filter unit (10) according to claim 6 or 7, wherein The pressure relief pipe (21) of the pressure relief device (20) and the housing (11) are integrally injection molded. The filter unit (10) according to any one of claims 2-8, wherein The pressure relief device (20) comprises: The filter unit (10) according to any one of claims 3-9, wherein ​ A pressure relief valve (23) is provided at the pressure relief port (22), and is configured to open and close the pressure relief port (22). The filter unit (10) according to claim 10, wherein The pressure relief valve (23) comprises: A pressure relief housing (24) is provided with a partition plate (26) inside, so as to divide the pressure relief housing (24) into a first chamber (27) and a second chamber (28), the pressure relief port (22) is switchably communicated with the first chamber (27), and a discharge port (271) is formed on the first chamber (27) and adapted to be communicated with the external atmosphere. The filter unit (10) according to claim 11, wherein The pressure relief valve (23) further comprises: A pressure relief movable rod (25) is provided on the partition plate (26), one end of the pressure relief movable rod (25) in the first chamber (27) is provided with a pressure relief plug (251) configured to block or open the pressure relief port (22), and the other end of the pressure relief movable rod (25) in the second chamber (28) is provided with a movable plate (252) dividing the second chamber (28) into a first sub-chamber (281) and a second sub-chamber (282), the first sub-chamber (281) is switchably communicated with the outlet (112) of the housing (11) or the second sub-chamber (282). The filter unit (10) according to claim 12, wherein The pressure relief valve (23) further comprises a switching valve (231), and the first sub-chamber (281) is switchably communicated with the outlet (112) or the second sub-chamber (282) through the switching valve (231). The filter unit (10) according to claim 12 or 13, wherein When the pressure at the outlet (112) reaches a predetermined pressure threshold, the pressure relief plug (251) opens the pressure relief port (22). The filter unit (10) according to any one of claims 12-14, wherein When the pressure relief port (22) is closed, the first sub-chamber (281) and the second sub-chamber (282) are communicated. The filter unit (10) according to any one of claims 12-15, wherein The pressure relief valve (23) further comprises an elastic member (29) abutting between the movable plate (252) and the inner wall of the second sub-chamber (282). An air supply device (100) comprises: A compression unit (30); and A filtering unit (10) according to any one of claims 1-16, an inlet (111) of the filtering unit (10) is switchably communicated with an outlet of the compression unit (30). The air supply device (100) according to claim 17, wherein The compression unit (30) comprises a cylinder (31) and a moving assembly (40), the cylinder (31) is provided with an air inlet (32), the moving assembly (40) is movably arranged in the cylinder (31), and the moving assembly (40) divides the cylinder (31) into a first compression chamber (33) and a second compression chamber (34), the first compression chamber (33) is communicated with the air inlet (32), and the second compression chamber (34) is switchably communicated with the first compression chamber (33) through the moving assembly (40). The compression unit (30) comprises a cylinder (31) and a moving assembly (40), the cylinder (31) is provided with an air inlet (32), the moving assembly (40) is movably arranged in the cylinder (31), and the moving assembly (40) divides the cylinder (31) into a first compression chamber (33) and a second compression chamber (34), the first compression chamber (33) is communicated with the air inlet (32), and the second compression chamber (34) is switchably communicated with the first compression chamber (33) through the moving assembly (40). The air supply device (100) according to claim 18, wherein The cylinder (31) is provided with a containing cavity (35) configured to contain the motion assembly (40), and the pressure relief port (22) and the air inlet port (32) are respectively communicated with the containing cavity (35). The air supply device (100) according to claim 19, wherein The cylinder (31) is formed with an airflow channel configured for gas to enter the first compression cavity (33) from the air inlet port (32). The air supply device (100) according to claim 19 or 20, wherein The cylinder (31) comprises a cylinder body (36) and an end cover (37), and the end cover (37) and the cylinder body (36) jointly enclose the containing cavity (35), and the airflow channel comprises an end cover communication channel (371) formed on the end cover (37). The air supply device (100) according to claim 21, wherein The airflow channel further comprises an air inlet channel (361) formed on the cylinder body (36), and the air inlet channel (361) is respectively communicated with the air inlet port (32) and the end cover communication channel (371). The air supply device (100) according to claim 21 or 22, wherein The cylinder (31) further comprises: A one-way valve (38) adapted to be arranged in the airflow channel to allow fluid flowing through the one-way valve (38) to flow to the first compression cavity (33) in one direction. The air supply device (100) according to claim 23, wherein The one-way valve (38) is arranged at one end of the end cover communication channel (371) communicated with the first compression cavity (33). The air supply device (100) according to any one of claims 21-24, further comprising: A temperature sensor (39) configured to collect the temperature of the gas in the first compression cavity (33), and the temperature sensor (39) is arranged on the end cover (37). The air supply device (100) according to claim 18, further comprising: A driving mechanism (46) connected with the motion assembly (40) to drive the motion assembly (40) to move relative to the cylinder (31). The air supply device (100) according to any one of claims 18-26, wherein The motion assembly (40) comprises: A piston connecting rod (41) movably arranged in the cylinder (31), the piston connecting rod (41) divides the cylinder (31) into the first compression cavity (33) and the second compression cavity (34), and the piston connecting rod (41) is formed with a communication channel (42), and the second compression cavity (34) is communicatable with the first compression cavity (33) through the communication channel (42); and A sealing device (43) arranged between one end of the piston connecting rod (41) adjacent to the second compression cavity (34) and the inner wall of the cylinder (31). The air supply device (100) according to claim 27, wherein The sealing device (43) comprises: A pressure head (44) arranged at one end of the piston connecting rod (41) adjacent to the second compression cavity (34), and the pressure head (44) is formed with a through hole (441), and the second compression cavity (34) is adapted to communicate with the communication channel (42) through the through hole (441); and A leather cup (45) arranged between the pressure head (44) and the piston connecting rod (41), and the leather cup (45) is located between the pressure head (44) and the inner wall of the cylinder (31). An air suspension system (200) comprising an air supply device (100) according to any one of claims 17-28. A vehicle (1000) comprising an air suspension system (200) according to claim 29.

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