Solenoid valve and air suspension charging and deflation device

Abstract

The present invention provides a solenoid valve and an air suspension inflation and deflation device. The solenoid valve comprises: a valve body, a first opening, a second opening and an inflation port are provided on the valve body; a main valve core, the main valve core is movably arranged in a valve cavity; a connecting channel and an installation cavity are provided on the main valve core; the main valve core has a closed position and an open position in which the inflation port and the first opening are connected through the connecting channel; when the main valve core is in the closed position, a driving cavity is formed between the main valve core and the valve body; a control valve core, the control valve core is movably arranged in the installation cavity; the control valve core has a first position for blocking at the second opening and a second position for fitting with the main valve core, and when the control valve core is in the second position, the second opening is connected with the driving cavity; a coil, the coil is wound on the main valve core; the pressurized gas enters the driving cavity through the second opening, so that the main valve core moves from the closed position to the open position. The present invention solves the problem of large space occupied by air suspension valves in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to a solenoid valve and an air suspension charging and discharging device. Background Art

[0002] In the prior art, an air suspension valve is used in an automobile air suspension system to control the inflation and deflation of the air suspension.

[0003] However, in the existing air suspension valve, the internal structure of the air suspension valve is complex, including a switch valve located on one side and an inflation and exhaust valve located on the other side, and has the disadvantages of occupying a large space, having a complex structure, having many parts and a complex air path. Summary of the invention

[0004] The main purpose of the present invention is to provide a solenoid valve and an air suspension inflation and deflation device to solve the problem of large occupied space of the air suspension valve in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a solenoid valve is provided, comprising: a valve body, the valve body having a valve cavity, one end of the valve body being provided with a first opening communicating with the valve cavity, the other end of the valve body being provided with a second opening communicating with the valve cavity, and a side wall of the valve body being provided with an inflation port communicating with the valve cavity; a main valve core, the main valve core being movably arranged in the valve cavity; a connecting channel being provided on the side wall of the main valve core; an installation cavity being provided on the end surface of the main valve core facing the second opening; the main valve core having a closed position blocking between the inflation port and the first opening and an open position communicating with the inflation port and the first opening through the connecting channel; when the main valve core is in the closed position a driving cavity is formed between the main valve core and the valve body; a control valve core, the control valve core is movably arranged in the installation cavity; the control valve core has a first position of blocking at the second opening and a second position of fitting with the main valve core, when the control valve core is in the first position, the control valve core and the main valve core are spaced apart; when the control valve core is in the second position, the second opening is connected with the driving cavity; a coil, the coil is wound on the main valve core; when the coil is in an energized state, the control valve core moves from the first position to the second position under the action of magnetic attraction, and the pressurized gas enters the driving cavity through the second opening, so that the main valve core moves from the closed position to the open position under the push of the pressurized gas.

[0006] Further, the main valve core includes a small end portion arranged opposite to the first opening and a large end portion arranged opposite to the second opening; a cross-sectional area S1 of the second opening is smaller than a cross-sectional area S2 of the small end portion.

[0007] Furthermore, an installation cavity is opened on the large end; along the direction away from the second opening, the installation cavity includes a first chamber and a second chamber that are connected, the cross-sectional area S3 of the first chamber is larger than the cross-sectional area of ​​the second chamber, and the control valve core is movably arranged in the second chamber; wherein, S3>S2.

[0008] Furthermore, the connecting channel is connected to the installation cavity; when the control valve core and the main valve core are spaced apart, the connecting channel is connected to the installation cavity; when the control valve core and the main valve core are fitted, the control valve core is blocked at the connecting port where the connecting channel and the installation cavity are connected.

[0009] Furthermore, along the direction away from the second opening, the control valve core includes a first shaft segment and a second shaft segment connected to each other, and the diameter of the first shaft segment is larger than the diameter of the second shaft segment; the solenoid valve also includes a first spring, which is sleeved on the second shaft segment and abuts against the bottom wall of the installation cavity and the first shaft segment.

[0010] Furthermore, the control valve core also has a third position. When the coil is in an energized state and the main valve core moves from a closed position to an open position, the control valve core moves from the second position to the third position under the action of magnetic attraction; when the coil is in a de-energized state, the control valve core moves from the third position to the first position under the elastic action of the first spring.

[0011] Furthermore, along the direction from the first opening to the second opening, the valve cavity includes a first cavity section, a second cavity section and a third cavity section connected in sequence, and the diameters of the first cavity section, the second cavity section and the third cavity section gradually increase; a first stop surface is formed between the second cavity section and the third cavity section, and a second stop surface is formed between the second cavity section and the third cavity section; the main valve core includes a first core section and a second core section connected to each other, and the diameter of the first core section is smaller than the diameter of the second core section; the first core section is adapted to the first cavity section, and the second core section is adapted to the third cavity section; when the main valve core is in the open position, the second stop surface cooperates with the second core section stop; the solenoid valve includes a second spring, and the second spring is sleeved on the first core section and abuts between the first stop surface and the second core section; when the coil is in the power-off state, the main valve core moves from the open position to the closed position under the elastic force of the second spring.

[0012] Furthermore, a mounting groove for accommodating the second spring is formed on the end surface of the second core segment away from the second opening.

[0013] Furthermore, the valve cavity also includes a fourth cavity section connected between the first cavity section and the first opening, and the diameter of the fourth cavity section is greater than the diameter of the first cavity section; when the main valve core is in the open position, part of the structure of the main valve core extends into the fourth cavity section.

[0014] Furthermore, the main valve core includes a first core segment and a second core segment connected to each other, the diameter of the first core segment is smaller than the diameter of the second core segment; the coil is a spring coil, which is sleeved on the first core segment and abuts between the second core segment and the valve body.

[0015] Furthermore, a first pressure relief channel communicating with the valve cavity is provided on the side wall of the valve body; a second pressure relief channel communicating with the valve cavity is provided on the side wall of the main valve core; a third pressure relief channel communicating with the second pressure relief channel is provided on the side wall of the control valve core; wherein, when the control valve core is spaced apart from the control valve core, the first chamber and the second pressure relief channel are communicated through the third pressure relief channel; and when the control valve core is fitted with the main valve core, part of the structure of the control valve core is blocked between the first chamber and the second pressure relief channel.

[0016] Further, the solenoid valve also includes: a first pressure relief sealing ring, the first pressure relief sealing ring is connected to the main valve core, the first pressure relief sealing ring is arranged between the outer peripheral wall of the control valve core and the inner peripheral wall of the installation cavity, and the first pressure relief sealing ring is located on the side of the second pressure relief channel close to the second opening; and / or a second pressure relief sealing ring, the second pressure relief sealing ring is connected to the control valve core, the second pressure relief sealing ring is arranged between the outer peripheral wall of the control valve core and the inner peripheral wall of the installation cavity, and the first pressure relief sealing ring is located on the side of the third pressure relief channel away from the second opening; and / or a third pressure relief sealing ring, the third pressure relief sealing ring is connected to the main valve core and is located at one end of the main valve core close to the second opening; the third pressure relief sealing ring is arranged between the outer peripheral wall of the large end of the main valve core and the inner peripheral wall of the valve cavity.

[0017] Furthermore, the solenoid valve also includes: an inflatable sealing ring, which is connected to the valve body and is located between the inner circumferential wall of the valve cavity and the outer circumferential wall of the main valve core; two inflatable sealing rings are respectively arranged on both sides of the inflation port.

[0018] Furthermore, the solenoid valve further comprises: a first sealing gasket, which is arranged at a first end of the control valve core close to the connecting channel; and / or a second sealing gasket, which is arranged at a second end of the control valve core close to the second opening.

[0019] According to another aspect of the present invention, an air suspension inflation and deflation device is provided, which includes a plurality of solenoid valves connected in series, the solenoid valves being the above-mentioned solenoid valves; wherein the inflation ports of two adjacent solenoid valves are connected; one of the plurality of solenoid valves located at the end is a pilot valve, and the remaining solenoid valves are inflation valves; the first opening of the pilot valve is used to connect to the air tank of the air compressor; the first opening of the inflation valve is used to connect to the air bag of the air suspension; the valve body of the pilot valve also has a pressure relief port connected to the valve cavity, and the pressure relief port is spaced apart from the inflation port; when the main valve core is in a closed position, the inflation port is connected to the pressure relief port through a connecting channel; when the main valve core is in an open position, part of the structure of the main valve core is blocked between the inflation port and the pressure relief port.

[0020] Furthermore, the first opening of the pilot valve is connected to the gas tank through the first pipeline to allow pressurized gas with a pressure of P to be introduced into the first opening of the pilot valve; the second opening of the pilot valve is connected to the first pipeline through the second pipeline to allow pressurized gas with a pressure of P to be introduced into the second opening of the pilot valve; the second opening of the inflation valve is connected to the first pipeline through the third pipeline to allow pressurized gas with a pressure of P to be introduced into the second opening of the inflation valve; the first opening of the inflation valve is connected to the airbag through the fourth pipeline.

[0021] By applying the technical solution of the present invention, when the solenoid valve provided in the present application is in an initial state, the main valve core is in a closed position and the control valve core is in a first position; when the airbag of the air suspension needs to be inflated, the control coil is in an energized state, so that the main valve core has magnetism, and the control valve core moves from the first position to the second position under the magnetic attraction of the main valve core. At this time, the control valve core no longer blocks the second air inlet, and the pressurized gas can enter the drive chamber through the second air inlet. The main valve core moves toward the side close to the first air inlet under the push of the pressurized gas and moves to the open position, so that the first air inlet and the inflation port are connected through the connecting channel on the main valve core, and then the airbag of the air suspension can be inflated through the first air inlet, the connecting channel and the inflation port.

[0022] The solenoid valve provided in the present application movably mounts the control valve core on the main valve core, making full use of the internal space of the valve body, thereby helping to reduce the space occupied by the valve body, reducing the number of parts and simplifying the gas circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic structural diagram of a solenoid valve according to an optional embodiment of the present invention is shown, wherein the main valve core of the solenoid valve is located in a closed position, and the control valve core of the solenoid valve is located in a first position;

[0025] Figure 2 Shows Figure 1 A schematic diagram of the structure of the solenoid valve in another state, wherein the main valve core is in a closed position and the control valve core is in a second position;

[0026] Figure 3 Shows Figure 1 A schematic diagram of the structure of the solenoid valve in another state, wherein the main valve core is located in the open position and the control valve core is located in the third position;

[0027] Figure 4 Shows Figure 1A schematic diagram of the structure of the solenoid valve in another state, wherein the main valve core is located in an open position and the control valve core is located in a first position;

[0028] Figure 5 A schematic structural diagram of an air suspension inflation and deflation device according to an optional embodiment of the present invention is shown.

[0029] The above drawings include the following reference numerals:

[0030] 1. Pilot valve; 2. Inflating valve; 10. Valve body; 200. Valve body; 300. Valve body cover; 11. Valve cavity; 111. First cavity section; 112. Second cavity section; 113. Third cavity section; 114. Fourth cavity section; 115. First stop surface; 116. Second stop surface; 101. First opening; 102. Second opening; 103. Inflating port; 104. First pressure relief channel; 105. Pressure relief port; 106. First pressure relief hole; 107. Second pressure relief hole; 20. Main valve core; 21. First core section; 22. Second core section; 221. Mounting groove; 201. Connecting channel; 202, installation cavity; 211, first chamber; 212, second chamber; 203, second pressure relief channel; 30, control valve core; 31, first shaft section; 32, second shaft section; 301, third pressure relief channel; 302, assembly groove; 40, coil; 50, first spring; 70, first pressure relief sealing ring; 80, second pressure relief sealing ring; 90, third pressure relief sealing ring; 100, inflatable sealing ring; 110, first sealing gasket; 120, second sealing gasket; 130, first pipeline; 140, second pipeline; 150, third pipeline; 160, fourth pipeline. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In order to solve the problem of large occupied space of the air suspension valve in the prior art, the present invention provides a solenoid valve and an air suspension inflation and deflation device.

[0033] like Figures 1 to 4As shown, the solenoid valve includes a valve body 10, a main valve core 20, a control valve core 30 and a coil 40. The valve body 10 has a valve cavity 11. One end of the valve body 10 is provided with a first opening 101 communicating with the valve cavity 11, and the other end of the valve body 10 is provided with a second opening 102 communicating with the valve cavity 11. The side wall of the valve body 10 is provided with an air charging port 103 communicating with the valve cavity 11, and the main valve core 20 is movably arranged in the valve cavity 11; a connecting channel 201 is provided on the side wall of the main valve core 20; an installation cavity 202 is provided on the end surface of the main valve core 20 facing the second opening 102; the main valve core 20 has a closed position blocking between the air charging port 103 and the first opening 101 and an open position connecting the air charging port 103 and the first opening 101 through the connecting channel 201; when the main valve core 20 is opened, the air charging port 103 is opened, and the air charging port 103 is opened. When ... When the valve core 20 is in the closed position, a driving cavity is formed between the main valve core 20 and the valve body 10, and the control valve core 30 is movably arranged in the installation cavity 202; the control valve core 30 has a first position where it is blocked at the second opening 102 and a second position where it is in contact with the main valve core 20. When the control valve core 30 is in the first position, the control valve core 30 and the main valve core 20 are spaced apart; when the control valve core 30 is in the second position, the second opening 102 is connected to the driving cavity, and the coil 40 is wound on the main valve core 20; when the coil 40 is in an energized state, the control valve core 30 moves from the first position to the second position under the action of magnetic attraction, and the pressurized gas enters the driving cavity through the second opening 102, so that the main valve core 20 moves from the closed position to the open position under the push of the pressurized gas.

[0034] In this embodiment, when the solenoid valve provided in the present application is in the initial state, the main valve core 20 is in the closed position and the control valve core 30 is in the first position; when the airbag of the air suspension needs to be inflated, the control coil 40 is in the energized state, so that the main valve core 20 has magnetism, and the control valve core 30 moves from the first position to the second position under the magnetic attraction of the main valve core 20. At this time, the control valve core 30 no longer blocks the second opening 102, and the pressurized gas can enter the drive chamber from the second opening 102. The main valve core 20 moves toward the side close to the first opening 101 under the push of the pressurized gas and moves to the open position, so that the first opening 101 and the inflation port 103 are connected through the connecting channel 201 on the main valve core 20, and then the airbag of the air suspension can be inflated through the first opening 101, the connecting channel 201 and the inflation port 103.

[0035] The solenoid valve provided in the present application movably mounts the control valve core 30 on the main valve core 20, making full use of the internal space of the valve body 10, thereby helping to reduce the space occupied by the valve body 10, reducing the number of parts and simplifying the gas circuit.

[0036] like Figure 1 and Figure 2As shown, the main valve core 20 includes a small end portion disposed opposite to the first opening 101 and a large end portion disposed opposite to the second opening 102; the cross-sectional area S1 of the second opening 102 is smaller than the cross-sectional area S2 of the small end portion. Figure 1 In the initial state shown, the coil 40 is in the power-off state, and when the compressed air with a pressure of P is provided to the valve cavity 11 through the air supply line through the first opening 101 and the second opening 102, the gas pressure to which the control valve core 30 is subjected is P·S1. Since S1 is small, the gas pressure to which the control valve core 30 is subjected is also small, and the control valve core 30 cannot be pushed to move; Figure 2 As shown, when the coil 40 is in the energized state, a magnetic field is generated inside the coil 40, so that the main valve core 20 generates a magnetic attraction force, and the control valve core 30 is attracted to the main valve core 20 and moves from the first position to the second position. At this time, the control valve core 30 is no longer blocked at the second opening 102, so that the pressurized gas enters the drive chamber through the second opening 102. Since the cross-sectional area of ​​the large end of the main valve core 20 is larger than the cross-sectional area of ​​the small end of the main valve core 20, the gas pressure received by the large end of the main valve core 20 is greater than the gas pressure received by the small end of the main valve core 20, so that the main valve core 20 can be driven by the pressurized gas to move from the closed position to the start position, as shown in FIG. Figure 3 shown.

[0037] like Figure 1 and Figure 2 As shown, a mounting cavity 202 is provided on the large end portion; in the direction away from the second opening 102, the mounting cavity 202 includes a first cavity 211 and a second cavity 212 that are connected, the cross-sectional area S3 of the first cavity 211 is larger than the cross-sectional area of ​​the second cavity 212, and the control valve core 30 is movably disposed in the second cavity 212; wherein S3>S2. In this way, when the solenoid valve is in the state as shown in FIG. Figure 1 In the initial state shown, when the coil 40 is in the power-off state, the large end of the main valve core 20 abuts against the valve body 10, and the second chamber 212 is the driving chamber; Figure 2 As shown in FIG. 1 , when the coil 40 is in the energized state, the control valve core 30 moves from the first position to the second position, and the pressurized gas enters the drive chamber through the second opening 102. Since the cross-sectional area S3 of the first chamber 211 is larger than the cross-sectional area S2 of the small end, the gas pressure P·S3 received by the large end is larger than the gas pressure P·S2 received by the small end, thereby enabling the main valve core 20 to move from the closed position to the start position under the drive of the pressurized gas, as shown in FIG. Figure 3 shown.

[0038] The present application designs the structural dimensions of the main valve core 20 and the dimensions of the second opening 102 according to the formula that pressure is equal to pressure multiplied by the force-bearing area, thereby utilizing pressurized gas to drive the main valve core 20 to move from a closed position to an open position, and ensures that when the coil is in a power-off state, the main valve core 20 is reliably located in the closed position and the control valve core 30 is reliably located in the first position.

[0039] like Figure 1 and Figure 4 As shown, the connecting channel 201 is connected to the installation cavity 202; when the control valve core 30 and the main valve core 20 are spaced apart, the connecting channel 201 is connected to the installation cavity 202; Figure 2 and Figure 3 As shown, when the control valve core 30 is fitted with the main valve core 20, the control valve core 30 is blocked at the connecting port where the connecting channel 201 is connected to the installation cavity 202. In this way, when the control valve core 30 and the main valve core 20 are in a fitted state, it is possible to prevent the pressure gas entering the connecting channel 201 from the first opening 101 from leaking into the installation cavity 202 through the connecting port, which is beneficial to improving the sealing performance of the solenoid valve; at the same time, this is also beneficial to shortening the flow path of the pressure gas. When the main valve core 20 moves to the open position, the pressure gas introduced from the first opening 101 does not need to enter the installation cavity 202, but directly enters the inflation port 103 through the connecting channel 201, which is beneficial to improving the inflation efficiency.

[0040] like Figure 1 As shown, in the direction away from the second opening 102, the control valve core 30 includes a first shaft section 31 and a second shaft section 32 connected to each other, and the diameter of the first shaft section 31 is larger than the diameter of the second shaft section 32; the solenoid valve also includes a first spring 50, which is sleeved on the second shaft section 32 and abuts against the bottom wall of the installation cavity 202 and the first shaft section 31. In this way, the first spring 50 is pressed between the valve body 10 and the first shaft section 31, providing the control valve core 30 with a spring force to move toward the side away from the first opening 101.

[0041] Specifically, when the solenoid valve is in Figure 1 In the initial state shown, the gas pressure P·S1 on the control valve core 30 is less than the spring force provided by the first spring 50 on the control valve core 30, so that the control valve core 30 is reliably located at the first position; the spring force provided by the first spring 50 on the main valve core 20 is less than the gas pressure P·S2 on the main valve core 20, so that the main valve core 20 is reliably located at the closed position. When the coil 40 is in the energized state, the magnetic attraction provided by the main valve core 20 causes the control valve core 30 to overcome the spring force provided by the first spring 50 and move from the first position to the second position to engage with the main valve core 20, as shown in FIG. Figure 2As shown, at this time, the gas pressure P·S3 on the main valve core 20 is much greater than the gas pressure P·S2 on the main valve core 20, so that the main valve core 20 moves from the closed position to the open position, as shown in FIG. Figure 3 When the coil 40 is in the de-energized state, the main valve core 20 no longer provides magnetic attraction, and the control valve core 30 returns to the first position under the action of the spring force of the first spring 50, and re-blocks the second opening 102, as shown Figure 4 Afterwards, the main valve core 20 moves from the open position to the closed position under the action of the gas pressure P·S2.

[0042] like Figure 3 As shown, the control valve core 30 also has a third position. When the coil 40 is in an energized state and the main valve core 20 moves from the closed position to the open position, the control valve core 30 moves from the second position to the third position under the action of magnetic attraction; Figure 4 As shown, when the coil 40 is in the de-energized state, the control valve core 30 moves from the third position to the first position under the elastic action of the first spring 50. In this way, when the main valve core 20 moves from the closed position to the open position, the coil 40 is kept in the energized state, and due to the electromagnetic attraction, the control valve core 30 moves synchronously with the main valve core 20, thereby maintaining the gas path state inside the main valve core 20 unchanged.

[0043] like Figure 1 As shown, along the direction from the first opening 101 to the second opening 102, the valve cavity 11 includes a first cavity section 111, a second cavity section 112 and a third cavity section 113 connected in sequence, and the diameters of the first cavity section 111, the second cavity section 112 and the third cavity section 113 gradually increase; a first stop surface 115 is formed between the second cavity section 112 and the third cavity section 113, and a second stop surface 116 is formed between the second cavity section 112 and the third cavity section 113; the main valve core 20 includes a first core section 21 and a second core section 22 connected to each other, and the first core section 2 1 is smaller than the diameter of the second core segment 22; the first core segment 21 is matched with the first cavity segment 111, and the second core segment 22 is matched with the third cavity segment 113; when the main valve core 20 is in the open position, the second stop surface 116 is matched with the second core segment 22; the solenoid valve includes a second spring, which is sleeved on the first core segment 21 and abuts between the first stop surface 115 and the second core segment 22; when the coil 40 is in the power-off state, the main valve core 20 moves from the open position to the closed position under the elastic force of the second spring. In this way, the second spring is pressed between the second core segment 22 and the valve body 10, and the second spring provides the main valve core 20 with a spring elastic force to move toward the side away from the first opening 101.

[0044] Specifically, when the solenoid valve is in Figure 1In the initial state shown, the spring force provided by the first spring 50 on the main valve core 20 is smaller than the sum of the spring force provided by the second spring on the main valve core 20 and the gas pressure P·S2 on the main valve core 20, so that the main valve core 20 is reliably located in the closed position; when the coil 40 is in the energized state, as shown in FIG. Figure 2 As shown, after the control valve core 30 moves from the first position to the second position under the magnetic effect of the main valve core 20, the pressurized gas enters the driving chamber from the second opening 102. At this time, the gas pressure P·S3 on the main valve core 20 is greater than the sum of the spring force provided by the second spring on the main valve core 20 and the gas pressure P·S2 on the main valve core 20, so that the main valve core 20 moves from the closed position to the open position, as shown in FIG. Figure 3 When the coil 40 is in the de-energized state, the main valve core 20 overcomes the spring force provided by the first spring 50 under the action of the gas pressure P·S2 and the spring force provided by the second spring, and moves from the open position to the closed position, and the solenoid valve returns to the state as shown. Figure 1 The initial state is shown.

[0045] Optionally, Figure 1 The use direction shown is the actual use direction, that is, the valve body 10 is placed in the vertical direction for use. In this way, during the movement of the main valve core 20 and the control valve core 30, the gravity of the main valve core 20 and the gravity of the control valve core 30 also need to be considered. Figure 1 In the initial state shown, the gas pressure P·S1 on the control valve core 30 is less than the sum of the spring force provided by the first spring 50 and the gravity of the control valve core 30, so that the control valve core 30 is in the first position; the gas pressure P·S2 on the main valve core 20, the spring force provided by the second spring and the gravity of the main valve core 20 are greater than the spring force provided by the first spring 50 on the main valve core 20, so that the main valve core 20 is in the closed position. When the coil 40 is in the energized state, the magnetic attraction force on the control valve core 30 causes the control valve core 30 to overcome the spring force provided by the first spring 50 and the gravity of the control valve core 30 and move upward from the first position to the second position, as shown in FIG. Figure 2 As shown, at this time, the gas pressure P·S3 on the main valve core 20 is greater than the sum of the spring force provided by the second spring on the main valve core 20, the gas pressure P·S2 on the main valve core 20 and the self-weight of the main valve core 20, so that the main valve core 20 moves upward from the closed position to the open position, as shown in FIG. Figure 3As shown, since the coil 40 is always in the energized state, the control valve core 30 will move upward to the third position synchronously with the main valve core 20. When the coil 40 is in the de-energized state, the control valve core 30 overcomes the gas pressure and falls from the third position to the first position under the action of the spring force provided by the first spring 50 and its own gravity, and re-blocks the second opening 102; the main valve core 20 overcomes the spring force provided by the first spring 50 and falls from the open position to the closed position under the action of the gas pressure P·S2, its own gravity and the spring force provided by the second spring.

[0046] like Figure 1 As shown, the main valve core 20 includes a first core segment 21 and a second core segment 22 connected to each other, and the diameter of the first core segment 21 is smaller than the diameter of the second core segment 22; the coil is a spring coil, which is sleeved on the first core segment 21 and abuts between the second core segment 22 and the valve body 10. In this way, the spring coil can not only play the role of providing elastic force for the main valve core 20 to move toward the side away from the first opening 101, but also play the role of generating magnetic attraction force when electrified, which has the advantages of simple structure, space saving, good economy, simple assembly and high efficiency.

[0047] In an optional embodiment not shown in the present application, the coil 40 is separately disposed on the main valve core 20 .

[0048] like Figure 1 As shown, a mounting groove 221 for accommodating the second spring is provided on the end surface of the second core segment 22 away from the second opening 102. Thus, the second spring is limited by the mounting groove 221, which is conducive to improving the connection stability between the second spring and the second core segment 22.

[0049] Optionally, the first core segment 21 is a small end portion; the second core segment 22 is a large end portion, and the end surface of the second core segment 22 away from the first core segment 21 is provided with a mounting cavity 202. Figure 1 In the optional embodiment shown, the first chamber 211 of the installation cavity 202 is a driving cavity; in an optional embodiment not shown in the present application, an annular protrusion that cooperates with the stopper of the second core segment 22 may also be provided on the inner wall of the valve body 10, and the annular protrusion is arranged around the circumference of the second opening 102. When the second core segment 22 cooperates with the protrusion stopper, a driving cavity is enclosed between the end face of the second core segment 22 and the protrusion.

[0050] like Figure 1As shown, the valve cavity 11 further includes a fourth cavity section 114 connected between the first cavity section 111 and the first opening 101, and the diameter of the fourth cavity section 114 is greater than the diameter of the first cavity section 111; when the main valve core 20 is in the open position, part of the structure of the main valve core 20 extends into the fourth cavity section 114. In this way, by providing the fourth cavity section 114, space is provided for the movement of the main valve core 20 to prevent the main valve core 20 from extending out of the valve body 10. At the same time, when the diameter of the fourth cavity section 114 is large, the gas pressure of the pressurized gas introduced from the first opening 101 to the small end of the main valve core 20 can be P·S2.

[0051] like Figure 5 As shown, a first pressure relief channel 104 communicating with the valve cavity 11 is provided on the side wall of the valve body 10; Figure 1 As shown, a second pressure relief channel 203 communicating with the valve chamber 11 is provided on the side wall of the main valve core 20; a third pressure relief channel 301 communicating with the second pressure relief channel 203 is provided on the side wall of the control valve core 30; Figure 1 and Figure 4 As shown, when the control valve core 30 is spaced apart from the control valve core 30, the first chamber 211 and the second pressure relief channel 203 are connected through the third pressure relief channel 301; Figure 2 and Figure 3 As shown, when the control valve core 30 is fitted with the main valve core 20, part of the structure of the control valve core 30 is blocked between the first chamber 211 and the second pressure relief channel 203. In this way, the first pressure relief channel 104 is used to connect the valve cavity 11 with the outside of the valve body 10. When multiple solenoid valves are used in series, the first pressure relief channel 104 is used to connect the valve cavity 11 with the first pressure relief channel 104 of another solenoid valve.

[0052] like Figure 1 As shown, the solenoid valve is a pilot valve of the air suspension inflation and deflation device, wherein a pressure relief port 105 communicating with the valve cavity 11 is also provided on the side wall of the valve body 10, for communicating the valve cavity 11 with the atmosphere outside the valve body 10. Figure 1 In the initial state shown, the main valve core 20 is in the closed position, the pressure relief port 105 and the inflation port 103 are connected through the connecting channel 201 to achieve pressure relief, and the pressure relief port 105 is connected with the second pressure relief channel 203, the third pressure relief channel 301 and the driving chamber; when the control valve core 30 moves from the first position to the second position, the excess gas can be discharged through the pressure relief port 105; when the main valve core 20 moves from the closed position to the open position, the excess gas in the third cavity section 113, the second pressure relief channel 203 and the third pressure relief channel 301 can be discharged through the pressure relief port 105, and when the main valve core 20 is in the open position, the pressure relief port 105 and the inflation port 103 are in a disconnected state; when the solenoid valve is in Figure 4In the state shown, the pressure relief port 105 is connected with the second pressure relief channel 203, the third pressure relief channel 301 and the driving chamber, so that the main valve core 20 loses the effect of the gas pressure P·S3, and then the main valve core 20 overcomes the spring force provided by the first spring 50 and moves from the open position to the closed position under the action of its own gravity, the spring force provided by the second spring and the gas pressure P·S2.

[0053] In a specific implementation, the pressure relief port 105 includes a first pressure relief hole 106 connected to the first cavity section 111 in the horizontal direction and a second pressure relief hole 107 extending in the vertical direction and connecting the first pressure relief hole 106 with the second cavity section 112. The first pressure relief channel 104 extends in the horizontal direction and is connected to the second cavity section 112. The first pressure relief channel 104 is used to communicate with the first pressure relief channel 104 of another solenoid valve.

[0054] like Figure 1 As shown, the solenoid valve further includes a first pressure relief seal ring 70, which is connected to the main valve core 20, and is disposed between the outer peripheral wall of the control valve core 30 and the inner peripheral wall of the installation cavity 202, and is located on a side of the second pressure relief channel 203 close to the second opening 102. Figure 2 and Figure 3 As shown, when the main valve core 20 and the control valve core 30 are fitted together, the first pressure relief seal ring 70 is used to seal the pressure relief cavity formed by the first pressure relief channel 104, the second pressure relief channel 203, the third pressure relief channel 301 and the pressure relief port 105 and the driving cavity, thereby improving the sealing performance of the solenoid valve. Figure 1 and Figure 4 As shown, since the third pressure relief channel 301 is longer in the vertical direction, the second pressure relief channel 203 and the driving chamber can be communicated through the third pressure relief channel 301 .

[0055] like Figure 1 As shown, the solenoid valve further includes a second pressure relief seal ring 80, which is connected to the control valve core 30 and is disposed between the outer peripheral wall of the control valve core 30 and the inner peripheral wall of the mounting cavity 202, and the first pressure relief seal ring 70 is located on the side of the third pressure relief channel 301 away from the second opening 102. In this way, the third pressure relief channel 301 is sealed by the second pressure relief seal ring 80, which is conducive to ensuring the reliability of the pressure gas drive and further improving the sealing performance of the solenoid valve.

[0056] like Figure 1As shown, the solenoid valve further includes a third pressure relief seal ring 90, which is connected to the main valve core 20 and is located at one end of the main valve core 20 close to the second opening 102; the third pressure relief seal ring 90 is arranged between the outer peripheral wall of the large end of the main valve core 20 and the inner peripheral wall of the valve cavity 11. In this way, the arrangement of the third pressure relief seal ring 90 can avoid gas leakage, which is conducive to ensuring the reliability of the pressure gas drive and further improving the sealing performance of the solenoid valve.

[0057] like Figure 1 As shown, the solenoid valve further includes an inflatable sealing ring 100, which is connected to the valve body 10 and is located between the inner peripheral wall of the valve cavity 11 and the outer peripheral wall of the main valve core 20; two inflatable sealing rings 100 are respectively arranged on both sides of the inflatable port 103. In this way, by setting the inflatable sealing ring 100, the inflation effect is ensured, gas leakage is avoided, the sealing performance of the solenoid valve is further improved, and the reliability of the pressure gas drive is also ensured.

[0058] like Figure 1 As shown, the solenoid valve further includes a first sealing gasket 110, which is disposed at a first end of the control valve core 30 close to the connecting passage 201. Thus, the provision of the first sealing gasket 110 is conducive to improving the reliability and sealing performance of the control valve core 30 when blocking the connecting passage 201.

[0059] like Figure 1 As shown, the solenoid valve further includes a second sealing gasket 120, which is disposed at the second end of the control valve core 30 close to the second opening 102. Thus, the provision of the second sealing gasket 120 is conducive to improving the reliability and sealing performance of the control valve core 30 when blocking the second opening 102.

[0060] like Figure 1 As shown, a mounting groove 302 is provided on the end surface of the control valve core 30 close to the second opening 102, and the second sealing gasket 120 is arranged in the mounting groove 302. In this way, the connection reliability between the control valve core 30 and the second sealing gasket 120 is improved.

[0061] like Figure 1 As shown, the valve body 10 includes a valve body 200 and a valve body cover plate 300 . The main valve core 20 and the control valve core 30 are conveniently installed in the valve cavity 11 through the split setting. The valve body cover plate 300 is provided with a second opening 102 .

[0062] like Figure 5As shown, the present application also provides an air suspension inflation and deflation device, which includes a plurality of solenoid valves connected in series, and the solenoid valves are the above-mentioned solenoid valves; wherein the inflation ports 103 of two adjacent solenoid valves are connected; one of the plurality of solenoid valves located at the end is a pilot valve 1, and the remaining solenoid valves are inflation valves 2; the first opening 101 of the pilot valve 1 is used to connect to the air tank of the air compressor; the first opening 101 of the inflation valve 2 is used to communicate with the airbag of the air suspension; the valve body 10 of the pilot valve 1 also has a pressure relief port 105 connected to the valve cavity 11, and the pressure relief port 105 is spaced apart from the inflation port 103; when the main valve core 20 is in a closed position, the inflation port 103 is connected to the pressure relief port 105 through the connecting channel 201; when the main valve core 20 is in an open position, part of the structure of the main valve core 20 is blocked between the inflation port 103 and the pressure relief port 105. In this way, the technical effect of inflating and deflation of the airbag of the air suspension is achieved by using the cooperation of the three-position two-way pilot valve 1 and the two-position two-way inflation valve 2.

[0063] The air suspension inflation and deflation device provided in this application adopts multiple solenoid valve linkage applications, and the pilot valve 1 is used as the main switch. Figures 1 to 4 The structure of the solenoid valve shown takes the pilot valve 1 as an example.

[0064] In specific implementation, Figure 5 As shown, the air suspension charging and discharging device includes three solenoid valves connected in series, the one located on the far right is the pilot valve 1, and the two located on the left are the charging valves 2, and the charging ports 103 of two adjacent solenoid valves are connected; the first pressure relief channels 104 of two adjacent solenoid valves are connected; when the air suspension is inflated using the air suspension charging and discharging device, the coils 40 controlling the pilot valve 1 and the charging valve 2 are both in a conductive state, so that the first openings 101 and the charging ports 103 of the pilot valve 1 and the charging valve 2 are connected through the connecting channel 201, so that the air tank of the air compressor fills the airbag of the air suspension with compressed air of a pressure of P through the first opening 101 and the charging port 103 of the pilot valve 1 and the charging port 103 and the first opening 101 of the charging valve 2.

[0065] In the attached figure, two charging valves 2 are used to charge and discharge air of the air suspension of the left and right wheels of the front axle / rear axle respectively. The difference between the pilot valve 1 and the charging valve 2 is that the pilot valve 1 is provided with a pressure relief port 105. When the power is off and closed, the charging port 103 is connected to the pressure relief port 105, while the other two charging valves 2 have no pressure relief port 105. When the power is off and closed, the charging port 103 is cut off from the first opening 101.

[0066] Specifically, when the air suspension needs to be inflated, the coils 40 controlling the multiple solenoid valves are all in an energized state, each main valve core 20 is attracted to the corresponding control valve core 30, and each control valve core 30 moves from the first position to the second position to block the connecting channel 201. The pressurized gas entering from each second opening 102 drives each main valve core 20 to move synchronously from the closed position to the open position. At the same time, due to the magnetic attraction, each control valve core 30 moves with each main valve core 20 from the second position to the third position. At this time, the first opening 101 of each solenoid valve is connected to the inflation port 103. The pressurized gas entering through the first opening 101 of the pilot valve 1 can pass through the corresponding inflation port 103, and the pressurized gas in the inflation port 103 enters the corresponding first opening 101 through the inflation port 103 of the adjacent inflation valve 2, so as to inflate the air bag of the air suspension of a tire of the front axle or the rear axle; at the same time, the pressurized gas in the inflation port 103 of the inflation valve 2 enters the corresponding first opening through the inflation port 103 of another adjacent inflation valve 2, so as to inflate the air bag of the air suspension of another tire of the front axle or the rear axle. After the predetermined inflation time, when the coils 40 controlling the multiple solenoid valves are all in the power-off state, each main valve core 20 no longer absorbs the corresponding control valve core 30, and each control valve core 30 moves from the third position to the first position; wherein, the pressure relief port 105 of the pilot valve 1 is connected with the second pressure relief channel 203, the third pressure relief channel 301 and the drive chamber, and at this time, the force P·S3 acting on the end face of the second core segment 22 of the main valve core 20 facing the second opening 102 disappears, so that the main valve core 20 moves from the open position to the closed position under the action of the gas pressure P·S2, its own gravity and the spring force of the second spring; at the same time, due to the first pressure relief channel 104 of the pilot valve 1 and the inflation port adjacent to it, The first pressure relief channel 104 of the valve 2 is connected, so that the force P·S3 acting on the main valve core 20 of the inflation valve 2 disappears, and the main valve core 20 of the inflation valve 2 moves from the open position to the closed position under the action of its own weight and the spring force of the second spring; it is connected to another first pressure relief channel 104 of the inflation valve 2 and the first pressure relief channel 104 of another inflation valve 2 adjacent to it, so that the force P·S3 acting on the main valve core 20 of the other inflation valve disappears, and the main valve core 20 of the other inflation valve moves from the open position to the closed position under the action of its own weight and the spring force of the second spring, and each inflation port 103 is not connected to each first opening 101, and the inflation operation is completed.

[0067] When the air suspension is deflated by using the air suspension inflation and deflation device, the coil 40 of the inflation valve 2 is controlled to be in an energized state, so that the first opening 101 of the inflation valve 2 is connected to the corresponding inflation port 103, and the coil 40 of the pilot valve 1 is controlled to be in an de-energized state, so that the main valve core 20 of the pilot valve 1 is in a closed position, and the inflation port 103 is connected to the pressure relief port 105. The gas in the airbag of the air suspension can be discharged through the inflation port 103 of the inflation valve 2 and the inflation port 103 and the pressure relief port 105 of the pilot valve 1.

[0068] like Figure 5 As shown, the first opening 101 of the pilot valve 1 is connected to the gas tank through the first pipeline 130, so that the pressure gas with a pressure of P is introduced into the first opening 101 of the pilot valve 1; the second opening 102 of the pilot valve 1 is connected to the first pipeline 130 through the second pipeline 140, so that the pressure gas with a pressure of P is introduced into the second opening 102 of the pilot valve 1; the second opening 102 of the inflation valve 2 is connected to the first pipeline 130 through the third pipeline 150, so that the pressure gas with a pressure of P is introduced into the second opening 102 of the inflation valve 2; the first opening 101 of the inflation valve 2 is connected to the airbag through the fourth pipeline 160. In this way, through the setting of the first pipeline 130, the second pipeline 140 and the third pipeline 150, pressurized gas with a pressure of P is introduced into the first opening 101 of the pilot valve 1, the second opening 102 of the pilot valve 1 and the second opening 102 of the inflation valve 2, so as to drive the movement of the main valve core 20 by utilizing the formula that gas pressure is equal to pressure multiplied by the force area, realize the opening and closing of the solenoid valve, and further realize the inflation and deflation functions.

[0069] The solenoid valve provided in the present application sets the control valve core 30 on the main valve core 20, and the control valve core 30 can slide in the installation cavity 202 of the main valve core 20 to open or close the internal gas path of the main valve core 20. This composite structure setting can fully utilize the volume space of the main valve core 20, and can also simplify the gas path, reduce the number of parts and reduce production costs, thereby solving the technical problems of the complex gas path system, slow response speed and high failure rate of the solenoid valve in the related art, and by optimizing the gas path of the control valve core 30 and the main valve core 20 and simplifying them, the solenoid valve is more reliable and responds more promptly.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0072] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0073] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0074] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that: include: A valve body (10), the valve body (10) having a valve cavity (11), one end of the valve body (10) being provided with a first opening (101) communicating with the valve cavity (11), the other end of the valve body (10) being provided with a second opening (102) communicating with the valve cavity (11), and a side wall of the valve body (10) being provided with an air charging port (103) communicating with the valve cavity (11); A main valve core (20), the main valve core (20) being movably arranged in the valve cavity (11); a connecting channel (201) being provided on a side wall of the main valve core (20); a mounting cavity (202) being provided on an end surface of the main valve core (20) facing the second opening (102); the main valve core (20) having a closed position for blocking between the inflation port (103) and the first opening (101) and an open position for connecting the inflation port (103) and the first opening (101) through the connecting channel (201); when the main valve core (20) is located in the closed position, a driving cavity is formed between the main valve core (20) and the valve body (10); a control valve core (30), the control valve core (30) being movably arranged in the installation cavity (202); the control valve core (30) having a first position in which it is blocked at the second opening (102) and a second position in which it is in contact with the main valve core (20); when the control valve core (30) is located at the first position, the control valve core (30) and the main valve core (20) are spaced apart; when the control valve core (30) is located at the second position, the second opening (102) is in communication with the drive cavity; A coil (40), wherein the coil (40) is wound around the main valve core (20); when the coil (40) is in an energized state, the control valve core (30) moves from the first position to the second position under the action of magnetic attraction, and the pressurized gas enters the drive chamber through the second opening (102), so that the main valve core (20) moves from the closed position to the open position under the push of the pressurized gas.

2. The solenoid valve according to claim 1, characterized in that: The main valve core (20) comprises a small end portion arranged opposite to the first opening (101) and a large end portion arranged opposite to the second opening (102); a cross-sectional area S1 of the second opening (102) is smaller than a cross-sectional area S2 of the small end portion.

3. The solenoid valve according to claim 2, characterized in that: The large end portion is provided with the installation cavity (202); along the direction away from the second opening (102), the installation cavity (202) comprises a first chamber (211) and a second chamber (212) which are connected, the cross-sectional area S3 of the first chamber (211) being larger than the cross-sectional area of ​​the second chamber (212), and the control valve core (30) is movably arranged in the second chamber (212); wherein S3>S2.

4. The solenoid valve according to claim 1, characterized in that: The connecting passage (201) is connected to the installation cavity (202); when the control valve core (30) and the main valve core (20) are spaced apart, the connecting passage (201) is connected to the installation cavity (202); when the control valve core (30) and the main valve core (20) are fitted together, the control valve core (30) blocks the connecting opening between the connecting passage (201) and the installation cavity (202).

5. The solenoid valve according to claim 1, characterized in that: Along a direction away from the second opening (102), the control valve core (30) comprises a first shaft section (31) and a second shaft section (32) connected to each other, and the diameter of the first shaft section (31) is greater than the diameter of the second shaft section (32); The solenoid valve further comprises a first spring (50), wherein the first spring (50) is sleeved on the second shaft section (32) and abuts against the bottom wall of the installation cavity (202) and the first shaft section (31).

6. The solenoid valve according to claim 5, characterized in that: The control valve core (30) also has a third position. When the coil (40) is in an energized state and the main valve core (20) moves from the closed position to the open position, the control valve core (30) moves from the second position to the third position under the action of magnetic attraction; when the coil (40) is in an energized state, the control valve core (30) moves from the third position to the first position under the elastic action of the first spring (50).

7. The solenoid valve according to claim 1, characterized in that: Along the direction from the first opening (101) to the second opening (102), the valve cavity (11) comprises a first cavity section (111), a second cavity section (112) and a third cavity section (113) which are sequentially connected, and the diameters of the first cavity section (111), the second cavity section (112) and the third cavity section (113) gradually increase; a first stop surface (115) is formed between the second cavity section (112) and the third cavity section (113), and a second stop surface (116) is formed between the second cavity section (112) and the third cavity section (113); The main valve core (20) comprises a first core segment (21) and a second core segment (22) connected to each other, the diameter of the first core segment (21) being smaller than the diameter of the second core segment (22); the first core segment (21) is adapted to the first cavity segment (111), and the second core segment (22) is adapted to the third cavity segment (113); when the main valve core (20) is located at the open position, the second stop surface (116) is engaged with the second core segment (22); The solenoid valve comprises a second spring, which is sleeved on the first core segment (21) and abuts between the first stop surface (115) and the second core segment (22); when the coil (40) is in a power-off state, the main valve core (20) moves from the open position to the closed position under the elastic force of the second spring.

8. The solenoid valve according to claim 7, characterized in that: An installation groove (221) for accommodating the second spring is provided on the end surface of the second core segment (22) away from the second opening (102).

9. The solenoid valve according to claim 7, characterized in that: The valve cavity (11) further comprises a fourth cavity section (114) connected between the first cavity section (111) and the first opening (101), wherein the diameter of the fourth cavity section (114) is greater than the diameter of the first cavity section (111); when the main valve core (20) is located in the open position, part of the structure of the main valve core (20) extends into the fourth cavity section (114).

10. The solenoid valve according to claim 1, characterized in that: The main valve core (20) comprises a first core segment (21) and a second core segment (22) which are connected to each other, wherein the diameter of the first core segment (21) is smaller than the diameter of the second core segment (22); the coil is a spring coil, which is sleeved on the first core segment (21) and abuts against the second core segment (22) and the valve body (10).

11. The solenoid valve according to claim 3, characterized in that: A first pressure relief channel (104) communicating with the valve cavity (11) is provided on the side wall of the valve body (10); A second pressure relief channel (203) communicating with the valve cavity (11) is provided on the side wall of the main valve core (20); A third pressure relief channel (301) communicating with the second pressure relief channel (203) is provided on the side wall of the control valve core (30); Wherein, when the control valve core (30) is spaced apart from the control valve core (30), the first chamber (211) and the second pressure relief channel (203) are connected through the third pressure relief channel (301); when the control valve core (30) is fitted with the main valve core (20), part of the structure of the control valve core (30) is blocked between the first chamber (211) and the second pressure relief channel (203).

12. The solenoid valve according to claim 11, characterized in that: The solenoid valve further comprises: a first pressure relief sealing ring (70), the first pressure relief sealing ring (70) being connected to the main valve core (20), the first pressure relief sealing ring (70) being arranged between the outer peripheral wall of the control valve core (30) and the inner peripheral wall of the installation cavity (202), the first pressure relief sealing ring (70) being located on a side of the second pressure relief channel (203) close to the second opening (102); and / or a second pressure relief sealing ring (80), the second pressure relief sealing ring (80) being connected to the control valve core (30), the second pressure relief sealing ring (80) being arranged between the outer peripheral wall of the control valve core (30) and the inner peripheral wall of the installation cavity (202), the first pressure relief sealing ring (70) being located on a side of the third pressure relief channel (301) away from the second opening (102); and / or A third pressure relief sealing ring (90), the third pressure relief sealing ring (90) is connected to the main valve core (20) and is located at one end of the main valve core (20) close to the second opening (102); the third pressure relief sealing ring (90) is arranged between the outer peripheral wall of the large end of the main valve core (20) and the inner peripheral wall of the valve cavity (11).

13. The solenoid valve according to claim 1, characterized in that: The solenoid valve further comprises: An inflatable sealing ring (100), the inflatable sealing ring (100) is connected to the valve body (10), and the inflatable sealing ring (100) is located between the inner peripheral wall of the valve cavity (11) and the outer peripheral wall of the main valve core (20); two inflatable sealing rings (100) are respectively arranged on both sides of the inflation port (103).

14. The solenoid valve according to claim 1, characterized in that: The solenoid valve further comprises: a first sealing gasket (110), the first sealing gasket (110) being arranged at a first end of the control valve core (30) close to the connecting channel (201); and / or A second sealing gasket (120), wherein the second sealing gasket (120) is arranged at a second end of the control valve core (30) close to the second opening (102).

15. An air suspension inflation and deflation device, characterized in that: The air suspension inflation and deflation device comprises a plurality of solenoid valves connected in series, wherein the solenoid valve is the solenoid valve according to any one of claims 1 to 14; The inflation ports (103) of two adjacent solenoid valves are connected; one of the multiple solenoid valves located at the end is a pilot valve (1), and the remaining solenoid valves are inflation valves (2); the first opening (101) of the pilot valve (1) is used to connect to the air tank of the air compressor; the first opening (101) of the inflation valve (2) is used to communicate with the air bag of the air suspension; The valve body (10) of the pilot valve (1) further comprises a pressure relief port (105) connected to the valve cavity (11), and the pressure relief port (105) is arranged at a distance from the inflation port (103); when the main valve core (20) is located in the closed position, the inflation port (103) is connected to the pressure relief port (105) through the connecting channel (201); when the main valve core (20) is located in the open position, part of the structure of the main valve core (20) is blocked between the inflation port (103) and the pressure relief port (105).

16. The air suspension inflation and deflation device according to claim 15, characterized in that: The first opening (101) of the pilot valve (1) is connected to the gas tank through a first pipeline (130) so as to allow pressure gas of a pressure of P to be introduced into the first opening (101) of the pilot valve (1); the second opening (102) of the pilot valve (1) is connected to the first pipeline (130) through a second pipeline (140) so as to allow pressure gas of a pressure of P to be introduced into the second opening (102) of the pilot valve (1); the second opening (102) of the inflation valve (2) is connected to the first pipeline (130) through a third pipeline (150) so as to allow pressure gas of a pressure of P to be introduced into the second opening (102) of the inflation valve (2); the first opening (101) of the inflation valve (2) is connected to the airbag through a fourth pipeline (160).

Images