A height valve

Abstract

The present invention is a height valve, comprising a valve body with a valve cavity, a drive shaft assembly and a piston assembly are arranged in the valve cavity, the drive shaft assembly comprises a drive shaft and an eccentric pin eccentrically arranged at the bottom of the drive shaft, the top of the drive shaft extends out of the valve cavity and is connected to a lever, the drive shaft can drive the piston assembly to move along the length direction of the valve body in the valve cavity through the eccentric pin, a slide groove is provided on the piston assembly, a roller is sleeved in the gap outside the eccentric pin, and the gap of the roller is inserted in the slide groove. The height valve of the present invention can reduce the bending deformation of the lever and the wear of the piston assembly, effectively improve the service life of the lever and the piston assembly, reduce the debugging cost during mass production, and improve the reliability of the height valve.

Description

Technical Field

[0001] The present invention relates to the technical field of height adjustment of EMU body, and in particular to a height valve, which is mainly applicable to EMUs, and in particular to Fuxing high-cold EMUs. Background Art

[0002] In the rail vehicle braking system, in order to control the filling and exhaust of the vehicle bogie air spring, it is often achieved through a height valve (i.e., height adjustment valve). For example, in the urban rail braking system, the same car is equipped with two bogies, three-point type is equipped with three height valves, and four-point type is equipped with four height valves. In the same car, whether it is three-point or four-point type, there is at least one bogie, and two height valves are set. For the convenience of distinction, they are referred to as left valve and right valve, respectively. The height valves on the left and right sides are fixed on both sides of the bottom of the car body. The height valve includes a horizontal lever, a drive shaft assembly, a piston assembly and a valve core assembly. The drive shaft assembly includes a drive shaft and an eccentric pin eccentrically arranged at the bottom of the drive shaft. The drive shaft is fixed to one end of the horizontal lever, and the other end of the horizontal lever is connected to the vertical adjustment rod installed on the bogie through a joint bearing. The end of the eccentric pin is installed on the piston assembly. When the vehicle load causes the vertical movement of the car body relative to the bogie, it is transmitted to the horizontal lever through the vertical adjustment rod, and further transmitted to the drive shaft assembly installed on the height valve body, so that the drive shaft rotates around its own axis. The driving shaft assembly drives the piston assembly to move left or right as the driving shaft rotates through the eccentric pin, thereby controlling the valve core assembly of the height valve to realize the filling and exhausting of the height valve.

[0003] When the car body is at the set height, the horizontal lever of the height valve is in the so-called neutral position, and the valve core assembly of the height valve remains closed. At this time, the air spring neither fills nor exhausts air. When the height of the car body changes, the height valve will move up and down with the height of the car body, and the horizontal lever of the height valve will drive the drive shaft assembly to rotate, thereby driving the piston assembly to move horizontally on both sides to control the valve core assembly inside the height valve to charge or exhaust air to the air spring. When the car body is lowered, the horizontal lever of the height valve rotates upward around the drive shaft, at which time the air intake valve port opens, and the total air of the train charges the air spring through the height valve, forcing the car body to rise; when the car body rises, the horizontal lever of the height valve rotates downward around the drive shaft, at which time the exhaust valve port opens, and the air spring exhausts air to the outside through the height valve, and the height of the car body decreases.

[0004] However, in reality, the safe operation requirements of Fuxing EMUs are the most stringent. Its operating environment includes weather such as wind, sand, rain, snow, and haze, and occasionally there are phenomena such as salt fog, acid rain, and sandstorms. There is also a long-term continuous salt fog phenomenon in coastal areas. For example, the ambient temperature varies greatly from north to south in China, and the altitude span is large from east to west. In the braking system of Fuxing EMUs, especially the braking system of Fuxing high-cold EMUs, higher requirements are put forward for the performance requirements, technical indicators, safety protection, stability and reliability of the height valve. For example, in the braking system of Fuxing EMUs, a height valve main valve and a height valve auxiliary valve are respectively provided on the same bogie. The main valve can both charge and exhaust air, and the auxiliary valve only has an exhaust function. When the exhaust function of the main valve fails, the exhaust function of the auxiliary valve is used for safety redundancy.

[0005] However, the existing height valves in rail vehicle braking systems often have the following shortcomings:

[0006] First, the horizontal lever of the height valve is prone to bending and deformation due to irresistible external forces, and the non-wear-resistant piston assembly is prone to jamming and sintering, affecting its service life and the performance of the height valve.

[0007] On the one hand, it is reflected in: when the EMU accelerates, brakes, turns, the body load changes within a certain range, or the body is in normal operation and generates high-frequency vibration, it is easy to cause the lever to rotate at a large angle and the piston assembly to move frequently. On the other hand, it is reflected in: when the EMU turns or the air spring pressure on both sides of the same bogie is inconsistent, or when the EMU brakes urgently, the body will have a lateral displacement relative to the bogie. The external force generated by the above changes will be transmitted to the horizontal lever. When the external force exceeds the allowable bending stress of the horizontal lever, it will cause the horizontal lever to bend and deform. If the deformation is serious, it will affect the normal use of the height valve. Under normal circumstances, the external force borne by the horizontal lever can alleviate the above displacement changes through the joint bearing connected to the vertical adjustment rod. However, when the maximum adjustment displacement of the joint bearing of the vertical adjustment rod cannot meet the lateral displacement of the body relative to the bogie, because the horizontal lever and the drive shaft assembly are rigidly connected, the external force will be transmitted to the piston assembly through the horizontal lever and the drive shaft assembly, causing local pressure damage to the piston assembly and eccentric wear, stagnation, sintering and other phenomena between the piston assembly and the valve body.

[0008] Second, due to the dimensional chain requirements between the various components in the height valve, the adjustment of the neutral position, dead zone and flow rate of the existing height valve is time-consuming and laborious during mass production and maintenance.

[0009] Third, since the height valve is exposed under the vehicle and is subject to harsh working conditions, such as oil erosion, snow and ice accumulation in cold environments, and ice melting caused by high-pressure water impact, if the height valve is not properly protected, it may easily lead to failure of the height valve function, which will affect the normal operation of the vehicle.

[0010] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a height valve to overcome the defects of the prior art. Summary of the invention

[0011] The purpose of the present invention is to provide a height valve that can reduce the bending deformation of the lever and the wear of the piston assembly, effectively increase the service life of the lever and the piston assembly, reduce the debugging cost during mass production, and improve the reliability of the height valve.

[0012] The objective of the present invention is achieved in this way. A height valve comprises a valve body having a valve cavity, in which a drive shaft assembly and a piston assembly are arranged. The drive shaft assembly comprises a drive shaft and an eccentric pin eccentrically arranged at the bottom of the drive shaft. The top of the drive shaft extends out of the valve cavity and is connected to a lever. The drive shaft can drive the piston assembly to move in the valve cavity along the length direction of the valve body through the eccentric pin. A slide groove is provided on the piston assembly, and a roller is provided in the gap outside the eccentric pin, and the gap of the roller is inserted in the slide groove.

[0013] In a preferred embodiment of the present invention, a preset gap is left between the eccentric pin and the roller and the bottom of the slide groove.

[0014] In a preferred embodiment of the present invention, the driving shaft and the eccentric pin are made of stainless steel, and the roller and the slide groove portion of the piston assembly are made of plastic.

[0015] In a preferred embodiment of the present invention, a threaded hole is provided on the end face of the drive shaft extending out of the valve cavity, two parallel clamping planes are symmetrically formed on the side of the portion of the drive shaft extending out of the valve cavity, and one end of the lever is threadedly connected to the threaded hole by a fastening bolt.

[0016] In a preferred embodiment of the present invention, a side reference plane is formed by extending outward from the edge of the end surface of the drive shaft extending out of the valve cavity, and the side surface of the lever can abut against the side reference plane.

[0017] In a preferred embodiment of the present invention, the drive shaft assembly also includes a bushing and a positioning ring sleeved on the outside of the drive shaft, the bushing is interference fit with the inner wall of the valve body, and the positioning ring is clamped on the inner wall of the valve body and axially positions the drive shaft.

[0018] In a preferred embodiment of the present invention, the drive shaft is composed of a first cylinder and a second cylinder with successively decreasing diameters, the eccentric pin is eccentrically arranged at the bottom of the first cylinder, the bushing is sleeved on the first cylinder, and one end of the lever is connected to the second cylinder; the positioning ring includes a first washer and an elastic retaining ring which are sequentially sleeved on the second cylinder, and the first washer abuts against the end face of the first cylinder; an annular groove is opened on the inner wall of the valve body, and the elastic retaining ring is clamped in the annular groove.

[0019] In a preferred embodiment of the present invention, a stepped portion with an enlarged diameter is formed outwardly on the inner wall of the valve body, and a first sealing ring is sleeved on the first cylinder and located on the outer end surface of the bushing, and the first sealing ring abuts against the stepped portion.

[0020] In a preferred embodiment of the present invention, an air inlet and an air outlet are respectively provided at both ends of the valve body, and an air outlet is provided on the side of the valve body; a piston mounting hole with a reduced diameter is formed on the inner wall of the valve body, and the valve cavity is divided into a first cavity which can be communicated with the air inlet and a second cavity which can be communicated with the air outlet, and the air outlet is communicated with the piston mounting hole; the end of the air inlet close to the first cavity constitutes a check valve port, and the end of the piston mounting hole close to the first cavity constitutes an intake valve port, a check valve core which can elastically abut against the check valve port and a control valve core which can elastically abut against the intake valve port are provided in the first cavity and between the check valve port and the intake valve port, and a compression spring is sandwiched between the check valve core and the control valve core; a piston assembly is provided in the second cavity, one end of the piston assembly can be slidably penetrated in the piston mounting hole, the end of the piston assembly close to the first cavity constitutes the exhaust valve port and can abut against the control valve core, and a connecting channel which can connect the exhaust valve port and the air outlet is provided inside the piston assembly.

[0021] In a preferred embodiment of the present invention, the piston assembly includes a piston body and a piston rod connected to each other, the piston body is arranged in the second cavity, and the slide groove is opened on the piston body; the first end of the piston rod is connected to the piston body, and the second end of the piston rod can be slidably penetrated into the piston mounting hole, the end of the second end of the piston rod constitutes an exhaust valve port, and the connecting channel is arranged in the piston rod.

[0022] In a preferred embodiment of the present invention, a second sealing ring is sandwiched between the piston rod and the piston mounting hole, a piston neck with a reduced outer diameter is formed at the portion of the piston rod close to the first chamber, and the end of the piston neck constitutes an exhaust valve port.

[0023] In a preferred embodiment of the present invention, two air outlets are symmetrically provided on the upper and lower sides of the valve body, and a screw plug is detachably connected to one of the air outlets.

[0024] In a preferred embodiment of the present invention, a shrinkage plug is provided in the air outlet.

[0025] In a preferred embodiment of the present invention, a first transition joint, a second transition joint and a third transition joint are sealed at the air inlet, the air exhaust port and the air outlet, respectively, and filters are provided in the air inlet, the air exhaust port and the air outlet.

[0026] In a preferred embodiment of the present invention, an exhaust component is sealed at the exhaust port, the interior of the exhaust component has an exhaust passage connected to the exhaust port, and the exhaust passage is vertically arranged downward.

[0027] In a preferred embodiment of the present invention, the exhaust assembly includes a hollow bolt and an exhaust pipe connected to the interior of the hollow bolt, the hollow bolt is connected to the exhaust port and the interior of the hollow bolt is connected to the exhaust port, and the interior of the exhaust pipe constitutes an exhaust channel.

[0028] As described above, the height valve in the present invention is sleeved with a roller on the outside of the eccentric pin, and the eccentric pin and the roller, as well as the roller and the slide groove, are all fitted with clearances. The clearances between them can be used to control the rotation angle of the lever within a certain range, reduce the degree of bending deformation of the lever, effectively reduce the number of horizontal movements of the piston assembly, and effectively increase the service life of related parts such as the lever and piston assembly in the height valve. At the same time, the number of frequent inflation and exhaust of the height valve is reduced, which can reduce the discomfort caused by the continuous inflation and exhaust of the air spring, improve the smoothness of the EMU vehicle during driving, and make the performance more stable and reliable. In addition, the existence of the above-mentioned gap can also provide adjustment space for mass production and maintenance of the height valve, which is more convenient for adjusting the neutral position and the dead zone, reduces the debugging cost during mass production, and improves the reliability of the height valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0030] Figure 1 : is an overall diagram of the height valve provided in the present invention.

[0031] Figure 2 : It is the front view of the height valve provided in the present invention.

[0032] Figure 3 : A top view of the height valve provided in the present invention.

[0033] Figure 4 :for Figure 2 A partial enlarged view of point A in the middle.

[0034] Figure 5 : It is a schematic structural diagram of the cooperation between the drive shaft and the piston body provided in the present invention.

[0035] Figure 6 : A schematic diagram of the structure of the drive shaft provided in the present invention Figure 1 .

[0036] Figure 7 : A schematic diagram of the structure of the drive shaft provided in the present invention Figure 2 .

[0037] Figure 8 : It is a simplified structural diagram of the height valve provided in the present invention when it is in the neutral position.

[0038] Fig. 9: It is a simplified structural diagram of the height valve provided in the present invention when it is in the air-filled state.

[0039] Fig.10 : is a simplified structural diagram of the height valve provided in the present invention when it is in the exhaust state. Among them, Fig. 9 and Fig.10 The arrows in the diagram represent the direction of air flow.

[0040] Description of Figure Numbers:

[0041] 1. Valve body; 11. Valve cavity; 111. First cavity; 112. Second cavity; 12. First cylinder; 121. Piston mounting hole; 122. Step hole; 13. Second cylinder; 131. Annular groove; 132. Step portion; 14. Screw plug; 15. First transition joint; 16. Second transition joint; 17. Filter element;

[0042] V, air inlet; E, air outlet; L, air outlet;

[0043] 2. Drive shaft assembly;

[0044] 21. driving shaft; 211. clamping plane; 212. side reference plane; 213. first cylinder; 214. second cylinder; 215. threaded hole;

[0045] 22. eccentric pin; 23. roller; 24. fastening bolt; 241. first gasket;

[0046] 25. Bushing; 26. Positioning ring; 261. First gasket; 262. Circlip; 27. First sealing ring;

[0047] 3. Piston assembly; 31. Piston body; 311. Slide groove; 32. Piston rod; 321. Piston neck; 322. Axial hole; 323. Radial hole; 33. Connecting spring; 34. Second sealing ring; 35. Second gasket; 36. Retaining ring; 37. Positioning pin;

[0048] 4. Valve core assembly; 41. Check valve core; 42. Control valve core; 43. Compression spring; V1. Check valve port; V2. Intake valve port; V3. Exhaust valve port;

[0049] 5. Leverage;

[0050] 6. Exhaust assembly; 61. Exhaust channel; 62. Hollow bolt; 63. Exhaust pipe; 631. Core pipe; 632. Press sleeve; 633. Rubber hose; 64. Second gasket. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0052] like Figures 1 to 10 As shown, this embodiment provides a height valve, including a valve body 1 with a valve cavity 11, a drive shaft assembly 2 and a piston assembly 3 are arranged in the valve cavity 11, the drive shaft assembly 2 includes a drive shaft 21 and an eccentric pin 22 eccentrically arranged at the bottom of the drive shaft 21, the top of the drive shaft 21 extends out of the valve cavity 11 and is connected to a lever 5, and the drive shaft 21 can drive the piston assembly 3 to move along the length direction of the valve body 1 in the valve cavity 11 through the eccentric pin 22. A slide groove 311 is opened on the piston assembly 3, and a roller 23 is sleeved in the gap outside the eccentric pin 22, and the roller 23 is inserted in the slide groove 311.

[0053] The above-mentioned slide groove 311 preferably adopts a long strip-shaped slide groove, and the length direction of the long strip-shaped slide groove is perpendicular to the length direction of the valve body 1, so that when the drive shaft 21 rotates relative to the valve body 1, it is convenient to convert the rotational motion of the drive shaft 21 into the horizontal motion of the piston assembly 3 through the eccentric pin 22. When in use, the above-mentioned lever 5 is connected to the vertical adjustment rod installed on the bogie. When the EMU accelerates, brakes, turns, the body load changes within a certain range, or the body is in normal operation and generates high-frequency vibration, the body will be relatively displaced relative to the bogie, causing the lever 5 to rotate at a small angle. Since there are gaps between the eccentric pin 22 and the roller 23 and between the roller 23 and the slide groove 311 (the specific gap size is determined according to actual needs), the rotation angle of the lever 5 can be controlled within a certain range, that is, the height valve is still kept in a neutral position, so that the piston assembly 3 will not be frequently driven to cause horizontal displacement, resulting in frequent switching of the valve core assembly 4 of the height valve.

[0054] Therefore, in the height valve of this embodiment, a roller 23 is sleeved on the outside of the eccentric pin 22, and the eccentric pin 22 and the roller 23, as well as the roller 23 and the slide groove 311 are all fitted with clearance. The clearance between them can be used to control the rotation angle of the lever 5 within a certain range, reduce the degree of bending deformation of the lever 5, effectively reduce the number of horizontal movements of the piston assembly 3, and effectively improve the service life of the lever 5 and the piston assembly 3 and other related parts in the height valve. At the same time, the number of frequent inflation and exhaust of the height valve is reduced, which can reduce the discomfort caused by the continuous inflation and exhaust of the air spring, improve the smoothness of the EMU vehicle during driving, and make the performance more stable and reliable. In addition, the existence of the above-mentioned gap can also provide adjustment space for mass production and maintenance of the height valve, which is more convenient for adjusting the neutral position and the dead zone, reducing the debugging cost during mass production, and improving the reliability of the height valve.

[0055] In the specific implementation, Figure 3 and Figure 5As shown, a preset gap is left between the eccentric pin 22 and the roller 23 and the bottom of the slide groove 311. The size of the preset gap is determined according to actual needs. In this way, when the EMU turns or the air spring pressures on both sides of the same bogie are inconsistent, or when the EMU is in emergency braking, the car body will be lateral displacement relative to the bogie. In this embodiment, due to the existence of the above-mentioned preset gap, the degree of freedom between the transmission mechanism can be increased, and the pressure transmitted to the piston assembly 3 from the outside can be reduced, thereby avoiding the piston assembly 3 and local damage due to pressure, and effectively reducing the occurrence of eccentric wear, stagnation, sintering and other phenomena between the piston assembly 3 and the valve body 1.

[0056] Preferably, the drive shaft 21 and the eccentric pin 22 are made of stainless steel, and the roller 23 and the slide groove 311 in the piston assembly 3 are made of plastic. This not only ensures the structural strength of the components, but also reduces the friction loss of the piston assembly 3 on the valve body 1 during the movement of the piston assembly 3, thereby increasing the service life of the valve body 1. At the same time, the eccentric pin 22 is fitted onto the roller 23 through clearance fit and then matched with the slide groove 311 of the piston assembly 3, thereby avoiding direct contact between the eccentric pin 22 made of metal and the slide groove 311 made of non-metal, and effectively preventing the eccentric pin 22 from damaging the slide groove 311 of the piston assembly 3 when transmitting force to the piston assembly 3, thereby affecting the operating performance of the height valve.

[0057] Further, in order to facilitate the connection between the lever 5 and the drive shaft 21, as shown in FIG. Figure 3 as well as Figures 5 to 7 As shown, a threaded hole 215 is provided on the end surface of the drive shaft 21 extending out of the valve cavity 11, and two parallel clamping planes 211 are symmetrically formed on the side surface of the portion of the drive shaft 21 extending out of the valve cavity 11, and one end of the lever 5 is threadedly connected to the threaded hole 215 through a fastening bolt 24, so that the lever 5 is rigidly connected to the drive shaft 21. The clamping plane 211 can be formed by milling on both sides of the drive shaft 21 by a milling machine, so as to facilitate the fixed clamping when the drive shaft 21 and the lever 5 are connected by the fastening bolt 24.

[0058] Generally, a first gasket 241 is provided on the contact surface between the lever 5 and the fastening bolt 24 and the drive shaft 21. The above-mentioned lever 5 can be a straight rod or a bent rod according to the actual working conditions. A mounting hole is processed at the other end of the lever 5 for connecting with the vertical adjustment rod, which is more convenient for quickly adjusting the neutral position and dead zone of the height valve with a larger operating space. Through the rotation angle of the end (i.e., the other end) of the lever 5, it is easier to quickly locate the slow charging, slow discharging and fast charging, fast discharging angles of the height valve, greatly improving the production operation efficiency. In order to prevent conduction, it is preferred to install an insulating pad at the mounting hole at the other end of the lever 5 before connecting with the vertical adjustment rod.

[0059] Preferably, a side reference plane 212 is formed by extending outward from the edge of the end surface of the drive shaft 21 extending out of the valve cavity 11, and the side surface of the lever 5 can abut against the side reference plane 212. The side reference plane 212 can be formed by milling the end surface of the drive shaft 21 by a milling machine, so that the rotation angle of the drive shaft assembly 2 can be adjusted quickly and accurately during the production of the height valve, thereby quickly positioning the neutral position of the height valve.

[0060] Furthermore, in order to facilitate the installation and positioning of the drive shaft 21, as Figure 3 and Figure 6 As shown, the drive shaft assembly 2 also includes a bushing 25 and a positioning ring 26 sleeved on the outside of the drive shaft 21. The bushing 25 is interference fit with the inner wall of the valve body 1, and the positioning ring 26 is clamped on the inner wall of the valve body 1 and axially positions the drive shaft 21.

[0061] Specifically, the drive shaft 21 is composed of a first cylinder 213 and a second cylinder 214 whose diameters are successively reduced, the eccentric pin 22 is eccentrically arranged at the bottom of the first cylinder 213, the bushing 25 is sleeved on the first cylinder 213, and one end of the lever 5 is connected to the second cylinder 214. The positioning ring 26 includes a first washer 261 and an elastic retaining ring 262 which are sleeved on the second cylinder 214 in sequence, and the first washer 261 abuts against the end surface of the first cylinder 213. An annular groove 131 is provided on the inner wall of the valve body 1, and the elastic retaining ring 262 is clamped in the annular groove 131. The drive shaft 21 can be quickly disassembled and assembled through the cooperation of the elastic retaining ring 262 and the first washer 261, which is more convenient.

[0062] It can be understood that the threaded hole 215 is provided on the second cylinder 214 and the first cylinder 213, and the clamping plane 211 and the side reference plane 212 are both formed on the second cylinder 214. Generally, a mounting hole is provided at the bottom of the first cylinder 213 at a position deviating from the axis of the drive shaft 21, and the eccentric pin 22 is interference-fitted with the mounting hole to be fastened to the bottom of the drive shaft 21. Preferably, a stepped portion 132 with an enlarged diameter is formed outwardly on the inner wall of the valve body 1, and a first sealing ring 27 is sleeved on the first cylinder 213 and located at the outer end surface of the bushing 25. The first sealing ring 27 abuts against the stepped portion 132, which can effectively protect the lubricating grease between the drive shaft 21 and the bushing 25 from spilling out, and effectively prevent the invasion of foreign matter from the outside.

[0063] Furthermore, if Figure 2 and Figure 3As shown, an air inlet V and an air outlet E are respectively provided at both ends of the valve body 1, and an air outlet L is provided at the side of the valve body 1. A piston mounting hole 121 with a reduced diameter is formed on the inner wall of the valve body 1, and the valve cavity 11 is divided into a first cavity 111 that can communicate with the air inlet V and a second cavity 112 that can communicate with the air outlet E, and the air outlet L is connected to the piston mounting hole 121. The end of the air inlet V close to the first cavity 111 constitutes a check valve port V1, and the end of the piston mounting hole 121 close to the first cavity 111 constitutes an intake valve port V2. A check valve core 41 that can elastically abut against the check valve port V1 and a control valve core 42 that can elastically abut against the intake valve port V2 are provided in the first cavity 111 and located between the check valve port V1 and the intake valve port V2, and a compression spring 43 is sandwiched between the check valve core 41 and the control valve core 42. The piston assembly 3 is arranged in the second chamber 112, and one end of the piston assembly 3 can be slidably inserted into the piston mounting hole 121. The end of the piston assembly 3 close to the first chamber 111 constitutes the exhaust valve port V3 and can be abutted against the control valve core 42. A connecting channel that can connect the exhaust valve port V3 and the exhaust port E is provided inside the piston assembly 3.

[0064] Generally, an axial hole 322 connected to the exhaust valve port V3 is provided in the piston rod 32, and a radial hole 323 connected to the axial hole 322 is provided on the side wall of the piston rod 32. The axial hole 322 and the radial hole 323 constitute the above-mentioned communication channel, which is connected to the exhaust port E through the second chamber 112. The above-mentioned check valve port V1, the air inlet valve port V2, the exhaust valve port V3, the check valve core 41, the control valve core 42 and the compression spring 43 constitute the valve core assembly 4 of the height valve. When in use, the air inlet V is connected to the main air duct, the exhaust port E is connected to the outside atmosphere, the air outlet L is connected to the air spring, and the check valve port V1 can prevent the air in the air spring from flowing back; when the air inlet valve port V2 is opened, the height valve is connected to the air spring, and the air spring is charged with air; when the exhaust valve port V3 is opened, the height valve is connected to the atmosphere, and the air spring is discharged.

[0065] The control valve core 42 is preferably composed of a skeleton and vulcanized rubber parts. When the vehicle is at a set height, the external total wind source acts on the check valve core 41 through the air inlet V. The check valve core 41 is sealed and contacted with the check valve port V1 under the action of the preset spring force of the compression spring 43. The other end of the compression spring 43 acts on the control valve core 42 to seal the control valve core 42 and the intake valve port V2. When the input pressure of the total air duct is reduced, the height valve can close the check valve port V1 in a timely, sensitive and reliable manner to prevent air from flowing back from the air spring to the total air duct, ensure the stability of the air spring pressure, and ensure the safe operation of the vehicle.

[0066] like Figures 1 to 3As shown, the entire valve body 1 is in the shape of a cylinder, including a first cylinder 12 and a second cylinder 13 which are vertically connected to each other, the above-mentioned piston assembly 3, the check valve core 41 and the control valve core 42 are all arranged in the first cylinder 12, the above-mentioned drive shaft assembly 2 is arranged in the second cylinder 13, and the above-mentioned step 132 and the annular groove 131 are both formed on the second cylinder 13. A mounting hole is provided on the outer wall of the first cylinder 12, through which the height valve is fastened to the mounting seat of the vehicle body or the pillow beam, and the axis of the first cylinder 12 and the plane where the axis of the second cylinder 13 is located are installed parallel to the horizontal plane. When in use, the entire piston assembly 3 can slide along the axial direction of the first cylinder 12 to control the valve core assembly 4 to charge or exhaust the air spring. The material of the valve body 1 is preferably cast aluminum or profile aluminum to reduce the weight of the valve body 1.

[0067] In detail, Figure 3 As shown, the piston assembly 3 includes a piston body 31 and a piston rod 32 connected to each other, the piston body 31 is arranged in the second chamber 112, and the slide groove 311 is opened on the piston body 31. The first end of the piston rod 32 is connected to the piston body 31, and the second end of the piston rod 32 can be slidably penetrated in the piston mounting hole 121. The end of the second end of the piston rod 32 constitutes an exhaust valve port V3, and a communication channel is arranged in the piston rod 32.

[0068] Generally, the piston body 31 is made of a non-metallic material with high wear resistance and low friction coefficient, such as plastic, and the piston rod 32 is made of a metal material with wear resistance and high hardness. More preferably, the first end of the piston rod 32 is preferably connected to the piston body 31 through a connecting spring 33 (the specific connection method is the prior art) or a universal joint (the structure of the universal joint is the prior art) to increase the degree of freedom of the piston rod 32 when the piston assembly 3 moves horizontally, and avoid stagnation and eccentric wear between the valve stem and the valve body 1.

[0069] In actual use, in order to ensure that the air does not leak from the exhaust port E when the height valve is charging the air spring, Figures 2 to 4 As shown, a second sealing ring 34 is sandwiched between the piston rod 32 and the piston mounting hole 121 to ensure the sealing between the piston rod 32 and the piston mounting hole 121. Preferably, a piston neck 321 with a reduced outer diameter is formed at the portion of the piston rod 32 close to the first chamber 111, and the end of the piston neck 321 constitutes an exhaust valve port V3. In this way, a large gap can be formed between the outer wall of the piston neck 321 and the inner wall of the piston mounting hole 121, and the gap is connected to the air outlet L. The flow rate during air filling can be adjusted by adjusting the outer diameter of the piston neck 321 during processing, which is simple and convenient.

[0070] Generally, in order to facilitate the fixing of the second sealing ring 34, a stepped hole 122 with an enlarged diameter is formed at one end of the piston mounting hole 121 close to the second chamber 112, and the above-mentioned second sealing ring 34 and a second gasket 35 are embedded in the stepped hole 122. A retaining ring 36 is also sleeved on the piston rod 32 and located in the second chamber 112, which abuts against the second gasket 35. A positioning pin 37 for positioning the retaining ring 36 is provided on the valve body 1, and the second sealing ring 34 and the second gasket 35 are fixed in the stepped hole 122 through the positioning pin 37 and the retaining ring 36. When the piston body 31 and the piston rod 32 are installed in the valve chamber 11, an appropriate amount of special lubricating oil will be applied to increase lubricity to reduce the resistance of the piston and the piston rod 32 when they move.

[0071] In the specific implementation process, Figure 2 As shown, generally, two air outlets L are symmetrically provided on the upper and lower sides of the valve body 1, and a screw plug 14 is detachably connected to one of the air outlets L. In specific applications, both air outlets L can be connected to the same air spring. According to the actual air supply requirements of the air spring of the vehicle, a single-port or dual-port air supply mode can be selected. When a single port is used for air supply, one of the air outlets L can be blocked with a screw plug 14. Preferably, a shrink plug is provided in the air outlet L. By designing shrink plugs of different specifications and sizes or the diameter size of the air outlet L, a height valve suitable for different specific flow requirements can be quickly matched, which greatly improves the versatility of the valve body 1.

[0072] Furthermore, in order to ensure the versatility of the valve body 1, the ports of the height valve can be adapted to more pipe fittings of different models and sizes, and to facilitate the subsequent disassembly, inspection and maintenance to effectively protect the threads of the ports of the valve body 1 from damage, thereby greatly improving the service life of the valve body. Figure 2 As shown, the first transition joint 15, the second transition joint 16 and the third transition joint (at the air inlet V, the air outlet E and the air outlet L) are respectively sealed and provided at the air inlet V, the air outlet E and the air outlet L. Figure 2 (not shown in the figure). Each transition joint preferably adopts a stainless steel transition joint, which is more applicable by connecting with the corresponding pipeline joint through the transition joint. It can be understood that the inner port of the first transition joint 15 constitutes the above-mentioned check valve port V1. In addition, when the ports of the height valve are connected to the pipeline joint, in order to prevent foreign matter from entering the valve body 1 during disassembly or maintenance, a filter 17 is provided in the air inlet V, the exhaust port E and the air outlet L. The filter 17 can be a filter screen or a filter element to play a protective role.

[0073] Furthermore, when in use, due to the installation requirements of the height valve when installed on a vehicle, the valve body 1 is in a horizontal position, that is, the air inlet V and the air outlet E of the height valve are both in a horizontal direction. In a high-cold environment, in order to prevent the exposed air outlet E from leaking and freezing and affecting the normal use of the height valve, Figure 2 As shown, an exhaust assembly 6 is sealed at the exhaust port E, and the exhaust assembly 6 has an exhaust channel 61 connected to the exhaust port E, and the exhaust channel 61 is arranged vertically downward. The exhaust channel 61 of the entire exhaust assembly 6 is arranged downward. When the EMU, especially the Fuxing high-cold train, has various unfavorable factors such as snow accumulation and ice formation under the vehicle, and high-pressure water impact melting ice in winter, it can effectively prevent rain and snow melt water from entering the valve body 1, causing the freezing failure of the internal parts of the height valve, and increasing the protection measures in the high-cold environment.

[0074] In detail, the general exhaust component 6 includes a hollow bolt 62 and an exhaust pipe 63 connected to the interior of the hollow bolt 62. The hollow bolt 62 is connected to the exhaust port E and the interior of the hollow bolt 62 is connected to the exhaust port E. The interior of the exhaust pipe 63 constitutes an exhaust channel 61.

[0075] In this embodiment, the exhaust pipe 63 includes a core tube 631, a compression sleeve 632 and a hose 633. One end of the core tube 631 has a C-shaped joint and is connected to the hollow bolt 62. The compression sleeve 632 is fixed on the outer side of the core tube 631 and forms an annular installation cavity between the core tube 631. One end of the hose 633 is embedded in the annular installation cavity. The interior of the core tube 631 is connected to the hose 633 and forms an exhaust passage 61. After the airflow passes through the exhaust port E, it enters the core tube 631 through the interior of the hollow bolt 62, and then is discharged to the atmosphere through the hose 633. Among them, when the above-mentioned second transition joint 16 is provided, the hollow bolt 62 is directly connected to the second transition joint 16. At the same time, a second gasket 64 is provided on the contact surface between the C-shaped joint and the hollow bolt 62 and the second transition joint 16. The hose 633 and the compression sleeve 632 are connected by a mature press-fitting process. The structure of the C-shaped joint is a prior art and is not described here.

[0076] Furthermore, combined with Figures 8 to 10 The working principle of the height valve in this embodiment is as follows:

[0077] During installation, the height valve is fastened to the vehicle body or the mounting seat of the contact bolster through the mounting hole on the valve body 1, and the lever 5 is connected to the vehicle bogie through the vertical adjustment rod. The air inlet V and the air outlet L are respectively connected to the main air duct and the air spring through metal hard pipes, and the air outlet E is connected to the outside atmosphere.

[0078] The vertical movement of the vehicle body relative to the bogie caused by the vehicle load is transmitted to the lever 5 through the vertical adjustment rod, and further transmitted to the drive shaft 21 and the eccentric pin 22 installed on the valve body 1. The eccentric pin 22 moves in the slide groove 311 of the piston assembly 3, so that the piston assembly 3 moves along the length direction of the valve body 1 as the drive shaft 21 rotates, that is, according to Figure 2The check valve core 41 and the check valve port V1 constitute a check valve, which can prevent the air from flowing back from the air spring to the air inlet V when the pressure of the air inlet V drops.

[0079] (1) The height valve is in the neutral position

[0080] If the vehicle is at a set height, the height valve is in the so-called neutral position, and the air spring is neither inflated nor exhausted. The inlet valve port V2 and the exhaust valve port V3 are both in a closed state, that is, the control valve core 42 is in sealing contact with the inlet valve port V2 and the exhaust valve port V3. Figure 8 shown.

[0081] (2) Loading: Filling the air spring with air

[0082] When the vehicle load increases, the vehicle body begins to sink. When the air spring is compressed, the drive shaft 21 rotates, causing the eccentric pin 22 to pull the piston assembly 3 to move to the left to open the intake valve port V2. The compressed air from the total wind enters the check valve core 41, thereby opening the check valve port V1. The air outlet L is connected to the intake valve port V2, and the passage of compressed air is throttled by the tiny gap between the piston neck 321 and the piston mounting hole 121 before reaching the air outlet L to enter the air spring. Specifically, after the air enters the first chamber 111 through the air inlet V, it enters the air outlet L through the gap between the piston neck 321 and the piston mounting hole 121. The air flow direction is as follows: Fig. 9 Indicated by the direction of the arrow.

[0083] When the lever 5 deflects more, the piston assembly 3 moves further to the left, the gap between the intake valve port V2 and the control valve core 42 increases, and the air intake volume increases. After the vehicle body is raised to the set position, the lever 5 returns to the horizontal position, the height valve is in the neutral position again, and the check valve port V1 and the intake valve port V2 are closed.

[0084] (3) Load reduction: air spring exhaust

[0085] When the vehicle load decreases, the air spring expands and the vehicle body begins to rise. At this time, the drive shaft 21 rotates, causing the eccentric pin 22 to pull the piston to move to the right to open the exhaust valve port V3. The intake valve port V2 remains closed under the action of the compression spring 43 and the pressure on the control valve core 42. The passage between the auxiliary air cylinder and the air spring on the vehicle is cut off. In the height valve with throttling, the compressed air passage leading to the air spring is throttled by the small gap between the piston neck 321 and the piston mounting hole 121, and then flows to the exhaust port E. The air flow direction is as follows: Fig.10 Indicated by the direction of the arrow.

[0086] When the lever 5 deflects more, the piston assembly 3 moves further to the right, the gap between the exhaust valve port V3 and the control valve core 42 increases, and the exhaust volume increases. After the vehicle body descends to the set position, the lever 5 returns to the initial horizontal position, the height valve is in the neutral position again, and the exhaust valve port V3 is closed.

[0087] In the process of charging and discharging the air spring, it is divided into slow charging, slow discharging and fast charging, fast discharging according to the size of the rotation angle of the lever 5, so as to quickly respond to the load change of the vehicle due to passengers getting on and off the vehicle, or quickly respond to the uncomfortable riding experience caused by the tilt of the vehicle body when turning. When the above-mentioned change trend increases and causes the rotation angle of the lever 5 to exceed the critical value, the height valve quickly switches from slow charging and slow discharging to fast charging and fast discharging mode, thereby ensuring the rapid charging and discharging of air springs on different bogies, thereby ensuring the stability, comfort, safety and reliability of the entire vehicle. The critical value of the rotation angle of the lever 5 is based on the angle specified in the industry standard, corresponding to the different opening sizes of each valve port, which in turn causes different flow rates.

[0088] In summary, the height valve in this embodiment has good filling and exhaust performance, simple structure, adjustable flow (mainly reflected in the shrinkage plug of different specifications and sizes, the diameter size of the air outlet L and the size design of the piston neck 321), stable performance, good protection performance (mainly reflected in the downward setting of the exhaust channel 61, the setting of the filter 17 and the setting of each sealing ring, which all play a good protective role, especially the coordinated use of each sealing ring and the exhaust component 6 further enhances the protection performance of the height valve and extends the service life of the height valve), sensitive response and stable and reliable transmission mechanism, it is easy to inspect and maintain, and it is more convenient to adjust the neutral position, dead zone and flow.

[0089] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A height valve, comprising a valve body with a valve cavity, a drive shaft assembly and a piston assembly are arranged in the valve cavity, the drive shaft assembly comprises a drive shaft and an eccentric pin eccentrically arranged at the bottom of the drive shaft, the top of the drive shaft extends out of the valve cavity and is connected to a lever, the drive shaft can drive the piston assembly to move in the valve cavity along the length direction of the valve body through the eccentric pin, characterized in that: A slide groove is provided on the piston assembly, a roller is sleeved in the gap outside the eccentric pin, and the gap of the roller is inserted in the slide groove; a preset gap is left between the eccentric pin and the roller and the bottom of the slide groove; the drive shaft and the eccentric pin are made of stainless steel, and the roller and the slide groove portion of the piston assembly are made of plastic; the piston rod is made of metal material, and the first end of the piston rod is connected to the piston body through a connecting spring or a universal joint to increase the freedom of the piston rod when the piston assembly moves horizontally.

2. The height valve according to claim 1, characterized in that A threaded hole is provided on the end surface of the drive shaft extending out of the valve cavity, two parallel clamping planes are symmetrically formed on the side of the portion of the drive shaft extending out of the valve cavity, and one end of the lever is threadedly connected to the threaded hole through a fastening bolt.

3. The height valve according to claim 2, characterized in that: A side reference plane is formed by extending outward from the end surface edge of the drive shaft extending out of the valve cavity, and the side surface of the lever can abut against the side reference plane.

4. The height valve according to claim 1, characterized in that: The drive shaft assembly also includes a bushing and a positioning ring sleeved on the outside of the drive shaft, the bushing is interference fit with the inner wall of the valve body, and the positioning ring is clamped on the inner wall of the valve body and axially positions the drive shaft.

5. The height valve according to claim 4, characterized in that: The driving shaft is composed of a first cylinder and a second cylinder with successively smaller diameters, the eccentric pin is eccentrically arranged at the bottom of the first cylinder, the bushing is sleeved on the first cylinder, and one end of the lever is connected to the second cylinder; The positioning ring includes a first gasket and an elastic retaining ring which are sequentially sleeved on the second cylinder, and the first gasket abuts against the end surface of the first cylinder; an annular groove is opened on the inner wall of the valve body, and the elastic retaining ring is clamped in the annular groove.

6. The height valve according to claim 5, characterized in that A stepped portion with an enlarged diameter is formed outwardly on the inner wall of the valve body, and a first sealing ring is sleeved on the first cylinder and located at the outer end surface of the bushing, and the first sealing ring abuts against the stepped portion.

7. The height valve according to claim 1, characterized in that: An air inlet and an air outlet are respectively provided at both ends of the valve body, and an air outlet is provided on the side of the valve body; a piston mounting hole with a reduced diameter is formed on the inner wall of the valve body, and the valve cavity is divided into a first cavity that can communicate with the air inlet and a second cavity that can communicate with the air outlet, and the air outlet is connected to the piston mounting hole; The end of the air inlet near the first chamber constitutes a check valve port, and the end of the piston mounting hole near the first chamber constitutes an intake valve port. A check valve core that can elastically abut against the check valve port and a control valve core that can elastically abut against the intake valve port are provided in the first chamber and between the check valve port and the intake valve port, and a compression spring is sandwiched between the check valve core and the control valve core; the piston assembly is provided in the second chamber, one end of the piston assembly can be slidably inserted into the piston mounting hole, the end of the piston assembly near the first chamber constitutes an exhaust valve port and can abut against the control valve core, and a connecting channel that can connect the exhaust valve port and the exhaust port is provided inside the piston assembly.

8. The height valve according to claim 7, characterized in that The piston assembly includes a piston body and a piston rod which are connected to each other. The piston body is arranged in the second cavity, and the slide groove is opened on the piston body. The first end of the piston rod is connected to the piston body, and the second end of the piston rod can be slidably inserted into the piston mounting hole. The end of the second end of the piston rod constitutes the exhaust valve port, and the connecting channel is arranged in the piston rod.

9. The height valve according to claim 8, characterized in that A second sealing ring is sandwiched between the piston rod and the piston mounting hole, and a piston neck with a reduced outer diameter is formed at the portion of the piston rod close to the first chamber, and the end of the piston neck constitutes the exhaust valve port.

10. The height valve according to claim 7, characterized in that: Two air outlets are symmetrically arranged on the upper and lower sides of the valve body, and a screw plug is detachably connected to one of the air outlets.

11. The height valve according to claim 7, characterized in that: A shrinkage plug is provided in the air outlet.

12. The height valve according to claim 7, characterized in that: A first transition joint, a second transition joint and a third transition joint are respectively sealed at the air inlet, the air outlet and the air outlet, and filters are provided in the air inlet, the air outlet and the air outlet.

13. The height valve according to claim 7, characterized in that: An exhaust component is sealed at the exhaust port, and an exhaust channel connected to the exhaust port is provided inside the exhaust component, and the exhaust channel is vertically arranged downward.

14. The height valve according to claim 13, characterized in that The exhaust assembly includes a hollow bolt and an exhaust pipe connected to the interior of the hollow bolt. The hollow bolt is connected to the exhaust port and the interior of the hollow bolt is connected to the exhaust port. The interior of the exhaust pipe constitutes the exhaust channel.

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