Air filter device for air suspension

Abstract

The present invention proposes an air filter device for air suspension, including a filter housing, a filter element and a return air pipe; the filter housing is provided with a filter cavity, the filter housing is provided with an exhaust port and an air inlet and a pressure relief port connected to the filter cavity, one end of the filter housing is provided with a first mounting tube and a second mounting tube, the first mounting tube is provided with a first mounting cavity, a pressure relief valve is installed in the first mounting cavity, the second mounting tube is provided with a second mounting cavity connected to the exhaust port and the first mounting cavity, and a solenoid valve is installed in the second mounting cavity; the filter element is installed in the filter cavity and a gap is left between the filter element and the inner wall of the filter housing, the filter element is open at one end close to the air inlet and is provided with an air outlet connected to the exhaust port at one end away from the air inlet; the return air pipe is connected to the first mounting tube and is connected to the first mounting cavity. The present invention integrates functions such as filtration and drying, air path control, and overpressure protection, reduces the number of parts of the automobile air suspension system, and is more convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to an air filtering device for an air suspension. Background Art

[0002] As an important part of the active suspension system of automobiles, air suspension can adjust the stiffness, damping and height of the suspension in real time according to the movement state of the automobile and the road conditions, so that the suspension system is in the best shock absorption state and the vehicle has good comfort under various road conditions. At present, air suspension is widely used in large buses, heavy trucks, special vehicles and high-end small cars.

[0003] The air suspension adjusts the stiffness, damping and height mainly by high-pressure air, and the high-pressure air of the air suspension is provided by an air pump, which can inhale the outside air and compress it to a certain pressure before inputting it into the air spring. In order to avoid the adverse effects of moisture and impurities in the air on the air spring and related auxiliary components, the air needs to be filtered through a dry filter before the high-pressure air is input into the air spring to remove moisture and impurities in the air. There are many types of air filters in use on the market, but most of them only have the function of drying and filtering, with a single function, and most of them use a closed metal shell, and the product quality is relatively heavy. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes an air filtering device for an air suspension.

[0005] The present invention provides an air filter device for an air suspension, comprising a filter housing, a filter element and an air return pipe;

[0006] The filter housing is provided with a filter cavity, the filter housing is provided with an exhaust port, an air inlet and a pressure relief port connected with the filter cavity, a first mounting tube and a second mounting tube are provided at one end of the filter housing, a first mounting tube is provided with a first mounting cavity, a pressure relief valve for controlling the opening and closing of the pressure relief port and the first mounting cavity is installed in the first mounting cavity, a second mounting tube is provided with a second mounting cavity connected with the exhaust port and the first mounting cavity, and a solenoid valve for controlling the action of the pressure relief valve is installed in the second mounting cavity;

[0007] The filter element is installed in the filter cavity with a gap between the filter element and the inner wall of the filter housing, the filter element is open at one end close to the air inlet and is provided with an outlet connected to the exhaust port at the end away from the air inlet;

[0008] The air return pipe is connected to the first installation pipe and communicates with the first installation cavity.

[0009] Preferably, it also includes an end cover, the filter housing is open at one end away from the first mounting tube, the end cover is cooperatively connected with the open end of the filter housing to seal the filter housing, and the end cover is provided with an air inlet.

[0010] Preferably, a spring is provided between the end cover and the filter element.

[0011] Preferably, the filter element comprises a filter housing, a filter screen and filter paper are installed in the filter housing, and the filter housing is filled with a desiccant.

[0012] Preferably, the pressure relief valve includes a valve core, an adjustment cover and a valve cover. The valve cover is rotatably engaged with the end of the first mounting tube, the adjustment cover is installed on the inner side of the valve cover, the valve core is movably installed in the first mounting cavity and can block the pressure relief port, and the first sealing ring and the second sealing ring are installed on the valve core. The first sealing ring and the second sealing ring divide the first mounting cavity into a first air cavity, a second air cavity and a third air cavity. The first air cavity is connected to the pressure relief port and the return air pipe, and a compression spring is installed in the third air cavity to keep the valve core in a normally closed state.

[0013] Preferably, the solenoid valve is connected to the second mounting pipe via bolts.

[0014] The air filter device for air suspension proposed by the present invention integrates functions such as filtration and drying, air path control, and overpressure protection, reduces the number of parts of the automobile air suspension system, and is more convenient to use; the present invention is equipped with a pressure relief valve, and the safety pressure setting of the pressure relief valve is adjustable in multiple levels, which can avoid the danger caused by excessive gas pressure; the present invention can control the air path to allow high-pressure gas to pass through the filter element in the reverse direction when the automobile air suspension system is deflated, thereby taking away moisture and impurities in the filter element, and effectively extending the service life of the drying filter; the filter housing and filter shell of the present invention are both made of plastic parts, which can greatly reduce the weight of the product; the parts of the present invention are mainly fixed by rotating and tightening, which reduces the number of parts and facilitates assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an air filter device for an air suspension proposed by the present invention;

[0016] Figure 2 This is a structural exploded view of an air filter device for an air suspension proposed by the present invention;

[0017] Figure 3 This is an inflation principle diagram of an air filter device for an air suspension proposed by the present invention;

[0018] Figure 4 A pressure relief principle diagram of an air filter device for an air suspension proposed by the present invention;

[0019] Figure 5 This is a deflation principle diagram of an air filter device for an air suspension proposed by the present invention. DETAILED DESCRIPTION

[0020] Reference Figure 1 , Figure 2The present invention provides an air filter device for an air suspension, comprising a filter housing 1, an end cover 15, a filter element 13 and an air return pipe 2; wherein:

[0021] The filter housing 1 is provided with a filter cavity 3, one end of the filter housing 1 is open and the open end is connected with an end cover 15, the end cover 15 is provided with an air inlet 5 connected with the filter cavity 3, and the filter housing 1 is provided with an exhaust port 4 and a pressure relief port 6 at one end away from the end cover.

[0022] The filter housing 1 is provided with a first mounting tube 7 and a second mounting tube 8 at one end away from the end cover 15. A first mounting cavity is provided in the first mounting tube 7, and a pressure relief valve 11 for controlling the opening and closing of the pressure relief port 6 and the first mounting cavity is installed in the first mounting cavity. The pressure relief valve 11 includes a valve core 1101, an adjustment cover 1102 and a valve cover 1103. The valve cover 1103 is rotatably engaged with the end of the first mounting tube 7. The inner end surface of the valve cover 1103 is provided with three groups of multi-level deep stepped grooves evenly distributed along the circumference. The adjustment cover 1102 is installed on the inner side of the valve cover 1103 and can rotate along its axis. The outer end surface of the adjustment cover 1102 is provided with three bosses that can cooperate with the grooves on the inner end surface of the valve cover 1103. Rotating the adjustment cover 1102 changes the adjustment The cooperation between the boss on the outer end face of the cover 1102 and the grooves of different depths on the inner end face of the valve cover 1103 can adjust the set safety pressure of the pressure relief valve 11. The valve core 1101 is movably installed in the first installation cavity and can block the pressure relief port 6. The valve core 1101 is installed with a first sealing ring 1105 and a second sealing ring 1106. The first sealing ring 1105 and the second sealing ring 1106 divide the first installation cavity into a first air cavity 9, a second air cavity 18, and a third air cavity 17. The first air cavity 9 is connected to the pressure relief port 6 and the return air pipe 2. The third air cavity 17 is installed with a compression spring 1104 that keeps the valve core 1101 in a normally closed state. The second installation tube 8 is provided with a second installation cavity 10 that is connected to the exhaust port 4 and the first installation cavity. The second installation cavity 10 is installed with a solenoid valve 12 that controls the pressure relief valve 11 through a bolt 19.

[0023] The filter element 13 is installed in the filter chamber 3 with a gap between the filter element 13 and the inner wall of the filter housing 1, and a spring 16 is provided between the filter element 13 and the end cover 15. The filter element 13 is open at one end close to the air inlet 5 and is provided with an outlet 14 connected to the exhaust port 4 at the end away from the air inlet 5.

[0024] The air return pipe 2 is connected to the first mounting pipe 7 and communicates with the first air cavity 9 .

[0025] In this embodiment, the filter element 13 includes a filter housing 1301 , in which a filter screen 1302 and filter paper are installed, and the filter housing 1301 is filled with a desiccant.

[0026] In this embodiment, the filter housing 1 and the filter housing 1201 are both made of plastic, which can greatly reduce the weight of the product.

[0027] When the present invention is used, the air inlet 5 of the filter housing 1 is connected to the air pump exhaust port, the air return pipe 2 is connected to the air pump return port, the exhaust port 4 is connected to the automobile air suspension system through the inflation pipeline, and the solenoid valve 12 is connected to the vehicle control system through a wire.

[0028] In addition to drying and filtering, the invention also includes air path control and overpressure protection functions, which reduces the number of parts in the automobile air suspension system and is more convenient to use. The specific implementation principle is:

[0029] Inflation principle: refer to Figure 3 When the air pump inflates the air suspension system, the solenoid valve 12 is controlled to connect the third air chamber 17 with the second air chamber 18. At this time, the pressure relief valve 11 is in a normally closed state under the action of the elastic force F1 of the compression spring 1104. The high-pressure gas from the air pump is filtered and dried by the filter element 13 and then filled into the air suspension system.

[0030] Deflation principle: refer to Figure 4 When the exhaust pressure is too high and exceeds the safety pressure set by the pressure relief valve 11, the force F2 exerted by the high-pressure gas on the pressure relief valve core 1101 exceeds the elastic force F1 of the compression spring 1104 (i.e., F2>F1), the pressure relief valve 11 opens, and part of the gas is discharged through the pressure relief valve 11 until the exhaust pressure returns to a safe range;

[0031] Deflation principle: refer to Figure 5 When the automobile air suspension system is deflated, the lower air chamber 18 and the exhaust port 4 are connected by controlling the solenoid valve 12, and the force F3 of the high-pressure gas on the valve core 1101 of the pressure relief valve exceeds the elastic force F1 of the compression spring 1104 (i.e., F3>F1), and the pressure relief valve is opened. The high-pressure gas from the air suspension system is discharged into the air pump intake chamber after passing through the filter element 13, the filter chamber 3, the first installation chamber, and the return air pipe 2, and then discharged into the outside atmosphere through the air pump intake pipe.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An air filter device for air suspension, characterized in that: It comprises a filter housing (1), a filter element (13) and an air return pipe (2); The filter housing (1) is provided with a filter cavity (3), the filter housing (1) is provided with an exhaust port (4), an air inlet (5) and a pressure relief port (6) which are in communication with the filter cavity (3), a first mounting tube (7) and a second mounting tube (8) are provided at one end of the filter housing (1), a first mounting cavity is provided in the first mounting tube (7), a pressure relief valve (11) for controlling the opening and closing of the pressure relief port (6) and the first mounting cavity is installed in the first mounting cavity, a second mounting cavity (10) which is in communication with the exhaust port (4) and the first mounting cavity is provided in the second mounting tube (8), and a solenoid valve (12) for controlling the operation of the pressure relief valve (11) is installed in the second mounting cavity (10); The filter element (13) is installed in the filter cavity (3) and a gap is left between the filter element (13) and the inner wall of the filter housing (1); the filter element (13) is open at one end close to the air inlet (5) and is provided with an air outlet (14) communicating with the air outlet (4) at one end away from the air inlet (5); The air return pipe (2) is connected to the first installation pipe (7) and communicates with the first installation cavity; The pressure relief valve (11) comprises a valve core (1101), an adjustment cover (1102) and a valve cover (1103). The valve cover (1103) is connected to the end of the first mounting tube (7) by rotational engagement. The inner end surface of the valve cover (1103) is provided with three groups of multi-level stepped grooves evenly distributed along the circumference. The adjustment cover (1102) is installed on the inner side of the valve cover (1103) and can rotate along its axis. The outer end surface of the adjustment cover (1102) is provided with three bosses that can cooperate with the grooves on the inner end surface of the valve cover (1103). The adjustment cover (1102) is rotated to change the outer end surface boss of the adjustment cover (1102) and the inner end surface of the valve cover (1103) The different depths of the grooves are changed. The grooves can be matched to adjust the set safety pressure of the pressure relief valve (11); the valve core (1101) is movably installed in the first installation cavity and can block the pressure relief port (6); a first sealing ring (1105) and a second sealing ring (1106) are installed on the valve core (1101); the first sealing ring (1105) and the second sealing ring (1106) divide the first installation cavity into a first air cavity (9), a second air cavity (18), and a third air cavity (17); the first air cavity (9) is connected to the pressure relief port (6) and the return air pipe (2); and a compression spring (1104) is installed in the third air cavity (17) to keep the valve core (1101) in a normally closed state.

2. The air filter device for air suspension according to claim 1, characterized in that: It also includes an end cover (15); one end of the filter housing (1) away from the first mounting tube (7) is open; the end cover (15) is cooperatively connected to the open end of the filter housing (1) to seal the filter housing (1); and the end cover (15) is provided with an air inlet (5).

3. The air filter device for air suspension according to claim 2, characterized in that: A spring (16) is provided between the end cover (15) and the filter element (13).

4. The air filter device for air suspension according to any one of claims 1 to 3, characterized in that: The filter element (13) comprises a filter housing (1301), a filter screen (1302) and filter paper are installed in the filter housing (1301), and a desiccant is filled in the filter housing (1301).

5. The air filter device for air suspension according to any one of claims 1 to 3, characterized in that: The solenoid valve (12) is connected to the second mounting pipe (8) via a bolt (19).

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