Train pipe constant pressure conversion system and control method

Abstract

This invention relates to a locomotive train pipe constant pressure switching system and control method. The system includes: a first equalizing pressure regulating valve, a second equalizing pressure regulating valve, a switching valve, an electrically interlocked switching valve, the first end of which is connected to the main air duct, and the second end of which is connected to the pre-control port of the switching valve; an electrically interlocked switch connected to the electrically interlocked switching valve; an air circuit cutoff unit connected between the switching valve and the equalizing air cylinder; and an exhaust unit connected to the equalizing air cylinder. The system controls the electrically interlocked switching valve to switch the train pipe constant pressure between the set values ​​of the first and second equalizing pressure regulating valves. Furthermore, when switching from the second to the first equalizing pressure regulating valve, the electrically interlocked feedback signal from the switching valve controls the air supply and exhaust passages of the equalizing air cylinder, causing the pressure in the equalizing air cylinder to decrease over a period of time.

Description

Technical Field

[0001] This invention belongs to the field of train pipe pressure control technology, and particularly relates to a train pipe constant pressure conversion system and control method. Background Technology

[0002] my country's freight trains have consistently used two types of train pipe pressure control: 500 kPa and 600 kPa. The locomotive controls the train pipe pressure indirectly. A fixed-volume equalizing cylinder and a relay valve are inserted between the automatic brake valve and the train pipe. The automatic brake valve controls the small-volume equalizing cylinder, which in turn controls the charging and discharging of the large-volume train pipe through the relay valve, thus controlling the train pipe pressure.

[0003] Currently, locomotives using logic brake control units require the driver and crew to adjust the equalizing air cylinder pressure regulating valve to the required pressure before switching from a constant pressure of 600 kPa to 500 kPa. They also need to operate the brake controller in the driver's cab to apply excessive pressure reduction to ensure the locomotive and rolling stock can be relieved during re-inflation. If the pressure reduction in the locomotive's equalizing air cylinder is insufficient during the switch from 600 kPa to 500 kPa, the pressure in the locomotive's working air cylinder and the vehicle's auxiliary air cylinder will remain close to or even exceed 500 kPa. This prevents an effective pressure difference from forming between the train pipe and the locomotive's working air cylinder or the vehicle's auxiliary air cylinder during re-inflation after the pressure switch to 500 kPa. Consequently, the locomotive and rolling stock cannot be relieved, ultimately leading to brake failure, the risk of wheel abrasion, and compromised driving safety. Summary of the Invention

[0004] To address the shortcomings of related technologies, this invention provides a locomotive train pipe pressure control system and method to improve the accuracy of train pipe pressure control.

[0005] This invention provides a locomotive train pipe pressure control system, comprising:

[0006] Main air duct;

[0007] Intermediate valve, the inlet of which is connected to the main air duct;

[0008] The train pipe is connected to the output port of the relay valve;

[0009] A balancing air cylinder, which is connected to the control port of the relay valve;

[0010] Also includes:

[0011] The first equalizing pressure regulating valve has its input port connected to the main air duct.

[0012] The second equalizing pressure regulating valve, the input port of the second equalizing pressure regulating valve is connected to the main air duct, the first

[0013] The set value of the second equalizing pressure regulating valve is greater than the set value of the first equalizing pressure regulating valve;

[0014] A switching valve, wherein the first air inlet of the switching valve is connected to the output port of the first equalizing pressure regulating valve.

[0015] The second air inlet of the switching valve is connected to the output port of the second equalizing pressure regulating valve;

[0016] An electrically interlocked changeover valve, the first end of which is connected to the main air duct.

[0017] The second end of the electric interlock switching valve is connected to the pre-control port of the switching valve;

[0018] An electric interlock switch, which is connected to the electric interlock changeover valve;

[0019] The air path cutoff unit is connected between the switching valve and the equalizing air cylinder; the air path cutoff...

[0020] The unit has: a first working state in which the air circuit cut-off unit connects the switching valve to the equalizing air cylinder; and a second working state in which the air circuit cut-off unit disconnects the switching valve from the equalizing air cylinder for a period of time and then reconnects them.

[0021] An exhaust unit is connected to the equalizing air cylinder. The exhaust unit has the following functions: a third working state in which the exhaust unit disconnects the equalizing air cylinder from the outside; and a fourth working state in which the exhaust unit connects the equalizing air cylinder to the outside for a period of time before disconnecting it.

[0022] When the outlet of the electric interlock switching valve is connected to the exhaust port, the pre-control port of the switching valve is not present.

[0023] At a preset air pressure, the second air inlet and outlet of the switching valve are connected, the electric interlock switch is disconnected, the air circuit cut-off unit is in the first working state, and the exhaust unit is in the third working state.

[0024] When the air inlet and outlet of the electric interlock switching valve are connected, the pre-control port of the switching valve has a preset air pressure, the first air inlet and outlet of the switching valve are connected, the electric interlock switch is closed, the air circuit cut-off unit enters the second working state, and the exhaust unit enters the fourth working state.

[0025] The aforementioned locomotive train pipe constant pressure conversion system simplifies the constant pressure conversion of the locomotive into a single operation. By controlling the connection between the air inlet and outlet of the electric interlock conversion valve or the connection between the air outlet and exhaust outlet of the electric interlock conversion valve, the constant pressure of the train pipe can be converted between the set value of the first equalization pressure regulating valve and the set value of the second equalization pressure regulating valve. Furthermore, when switching from the second equalizing pressure regulating valve to the first equalizing pressure regulating valve, the air circuit cut-off unit is controlled by the electric interlock feedback signal of the electric interlock switching valve to cut off the air circuit for a certain period of time. This cuts off the air charging passage of the equalizing air cylinder for a period of time, while the exhaust unit is briefly connected to the outside. That is, the exhaust passage of the equalizing air cylinder is opened for a period of time, forcing the pressure of the equalizing air cylinder to drop to a certain extent. This ensures that the pressure reduction of the train pipe is large enough so that an effective pressure difference can be formed between the train pipe and the locomotive working air cylinder or the vehicle auxiliary air cylinder during recharging, allowing the locomotive and vehicles to be relieved normally. After a period of time, the air charging passage of the equalizing air cylinder is restored, while the exhaust passage of the equalizing air cylinder is cut off to ensure that the equalizing air cylinder can perform normal charging and discharging control according to external commands.

[0026] In some embodiments, the gas path cutoff unit includes:

[0027] A shut-off valve, wherein the air inlet of the shut-off valve is connected to the air outlet of the switching valve, and the air outlet of the shut-off valve is connected to the equalizing air cylinder.

[0028] A shut-off solenoid valve is electrically connected to the electrical interlock switch. The air inlet of the shut-off solenoid valve is connected to the main air duct, and the air outlet of the shut-off solenoid valve is connected to the pre-control port of the shut-off valve.

[0029] When the shut-off solenoid valve is de-energized, the air inlet of the shut-off solenoid valve is disconnected from the air outlet of the shut-off solenoid valve, there is no preset air pressure at the pre-control port of the shut-off valve, and the air inlet and air outlet of the shut-off valve remain connected.

[0030] When the shut-off solenoid valve is energized, the air inlet of the shut-off solenoid valve is connected to the air outlet of the shut-off solenoid valve, the pre-control port of the shut-off valve has a preset air pressure, and the air inlet and outlet of the shut-off valve are disconnected for a period of time and then connected again.

[0031] In the first operating state, the shut-off solenoid valve is de-energized; in the second operating state, the shut-off solenoid valve is energized for a period of time and then de-energized.

[0032] In some embodiments, the exhaust unit includes:

[0033] An exhaust solenoid valve is provided, the air inlet of which is connected to the equalizing air cylinder; when the exhaust solenoid valve is energized, the air inlet and exhaust outlet of the exhaust solenoid valve are connected, and the equalizing air cylinder exhausts air to the outside; when the exhaust solenoid valve is de-energized, the air inlet and exhaust outlet of the exhaust solenoid valve are disconnected, and the equalizing air cylinder maintains pressure.

[0034] In the third working state, the exhaust solenoid valve is de-energized; in the fourth working state, the exhaust solenoid valve remains energized for a period of time before being de-energized.

[0035] In some embodiments, the train pipe constant pressure conversion system further includes:

[0036] The first power-off delay relay is connected in series with the shutdown solenoid valve and the electrical interlock switch;

[0037] The second power-off delay relay is connected in series with the exhaust solenoid valve and the electrical interlock switch;

[0038] When the electrical interlock switch is closed, the first power-off delay relay is energized, and the shut-off solenoid valve enters the second working state. At the same time, the second power-off delay relay is energized, and the exhaust solenoid valve enters the fourth working state.

[0039] In some embodiments, the first power-off delay relay is energized, and the normally open contact of the first power-off delay relay is closed, thereby energizing the shut-off solenoid valve. After the delay ends, the normally open contact of the first power-off delay relay is opened, thereby de-energizing the shut-off solenoid valve.

[0040] When the second power-off delay relay is energized, its normally open contact closes, energizing the exhaust solenoid valve. After the delay ends, the normally open contact of the second power-off delay relay opens, de-energizing the exhaust solenoid valve.

[0041] In some embodiments, the train pipe constant pressure conversion system further includes:

[0042] A relief solenoid valve is provided, which is located between the air circuit cutoff unit and the equalizing air cylinder. The air outlet of the relief solenoid valve is connected to the equalizing air cylinder. When the relief solenoid valve is energized, the air inlet and outlet of the relief solenoid valve are connected, and the equalizing air cylinder is filled with air. When the relief solenoid valve is de-energized, the air inlet and outlet of the relief solenoid valve are disconnected, and the equalizing air cylinder maintains pressure.

[0043] A brake solenoid valve, wherein the air inlet of the brake solenoid valve is connected to the equalizing air cylinder, and the air outlet of the brake solenoid valve is connected to the exhaust port; when the brake solenoid valve is energized, the air inlet and outlet of the brake solenoid valve are connected, and the equalizing air cylinder exhausts air; when the brake solenoid valve is de-energized, the air inlet and outlet of the brake solenoid valve are disconnected, and the equalizing air cylinder maintains pressure.

[0044] In some embodiments, the train pipe constant pressure conversion system further includes:

[0045] A braking control unit is configured to control the braking solenoid valve and the release solenoid valve according to the braking or release command of the train. Under the braking command, the braking control unit controls the braking solenoid valve to be energized and the release solenoid valve to be de-energized, and the equalizing air cylinder exhausts air through the braking solenoid valve. Under the release command, the braking control unit controls the braking solenoid valve to be de-energized and the release solenoid valve to be energized, and the equalizing air cylinder is filled with air through the release solenoid valve.

[0046] In addition, the present invention also provides a train pipe constant pressure switching control method, based on the above-mentioned train pipe constant pressure switching system, comprising:

[0047] Receive the second constant pressure conversion command;

[0048] Connect the second equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a second set pressure value;

[0049] The relay valve amplifies the pressure, allowing the train pipe to obtain a second constant pressure.

[0050] Receive the first constant pressure conversion command;

[0051] Control the equalizing air cylinder to reduce pressure to zero;

[0052] Connect the first equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a first set pressure value;

[0053] The relay valve amplifies the pressure, allowing the train pipe to obtain its first constant pressure.

[0054] Wherein, the first set value is less than the second set value.

[0055] In some embodiments, the train pipe constant pressure switching control method includes:

[0056] The electrical interlocking switch valve cutting off the pressure transmission of the main air duct to the pre-control port of the switching valve is regarded as issuing the second constant pressure switching command;

[0057] The second air inlet and outlet of the switching valve are connected, thereby connecting the second equalizing pressure regulating valve and the switching valve.

[0058] The normally open contact of the electrical interlock switch is open;

[0059] The air circuit cut-off unit connects the second equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit disconnects the equalizing air cylinder from the outside, thereby connecting the second equalizing pressure regulating valve, the switching valve, and the shut-off valve, so that the equalizing air cylinder obtains the pressure of the second set value;

[0060] The relay valve amplifies the pressure, allowing the train pipe to obtain the second constant pressure.

[0061] The electric interlock switching valve transmits the pressure of the main air duct to the pre-control port of the switching valve, which is regarded as issuing the first constant pressure switching command;

[0062] The first air inlet and the air outlet of the switching valve are connected, thereby connecting the first equalizing pressure regulating valve and the switching valve.

[0063] The electric interlock switch receives the feedback signal from the electric interlock changeover valve, and its normally open contact closes.

[0064] The air circuit cut-off unit cuts off the connection between the first equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit connects the equalizing air cylinder to the outside, so that the equalizing air cylinder is depressurized to zero.

[0065] The air circuit cut-off unit connects the second equalizing pressure regulating valve and the equalizing air cylinder. The exhaust unit disconnects the equalizing air cylinder from the outside and then connects the first equalizing pressure regulating valve and the equalizing air cylinder, so that the equalizing air cylinder obtains a first set pressure value.

[0066] The relay valve amplifies the pressure, allowing the train pipe to obtain the first constant pressure.

[0067] In some embodiments, the gas circuit cutoff unit and the electrical interlock switch are connected in series with a first power-off delay relay;

[0068] The exhaust unit and the electrical interlock switch are connected in series with a second power-off delay relay;

[0069] When the electrical interlock switch is closed, the first power-off delay relay is energized, the air circuit cut-off unit cuts off the connection between the first equalizing pressure regulating valve and the equalizing air cylinder, and at the same time, the second power-off delay relay is energized, the exhaust unit connects the equalizing air cylinder to the outside, so that the equalizing air cylinder is depressurized to zero.

[0070] After the delay ends, the air circuit cut-off unit connects the first equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit disconnects the equalizing air cylinder from the outside, thereby connecting the first equalizing pressure regulating valve, the shut-off valve and the equalizing air cylinder, so that the equalizing air cylinder obtains the pressure of the first set value. Attached Figure Description

[0071] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0072] Figure 1 This is a schematic diagram of the pipeline principle of an embodiment of the train pipe constant pressure conversion system of the present invention, wherein the air outlet of the electric interlock conversion valve is connected to the exhaust outlet;

[0073] Figure 2 for Figure 1 A schematic diagram of the circuit principle of the electrical interlock switch of the train pipe constant pressure conversion system and the first power-off delay relay and the second power-off delay relay;

[0074] Figure 3 for Figure 1 A magnified view of part A in the middle;

[0075] Figure 4 for Figure 1 A magnified view of part B in the middle section;

[0076] Figure 5 A schematic diagram of the pipeline principle of an embodiment of the train pipe constant pressure conversion system, wherein the air inlet and outlet of the electric interlock conversion valve are connected, and the normally open contact of the power-off delay relay is closed;

[0077] Figure 6 for Figure 5 A schematic diagram of the circuit principle of the electrical interlock switch of the train pipe constant pressure conversion system and the first power-off delay relay and the second power-off delay relay;

[0078] Figure 7 A schematic diagram of the pipeline principle of an embodiment of the train pipe constant pressure conversion system, wherein the air inlet and outlet of the electric interlock conversion valve are connected, and the normally open contact of the power-off delay relay is open;

[0079] In the picture:

[0080] 1. Relay valve; 2. Train pipe; 3. Equalizing air cylinder; 4. First equalizing pressure regulating valve; 5. Second equalizing pressure regulating valve; 6. Switching valve; 7. Electrical interlocking conversion valve; 8. Shutdown solenoid valve; 9. Shutdown valve; 10. Exhaust solenoid valve; 11. Electrical interlocking switch; 12. Release solenoid valve; 13. Braking solenoid valve; 14. Distribution valve; 15. Working air cylinder; K11. First power-off delay relay; K12. Second power-off delay relay. Detailed Implementation

[0081] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0082] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0083] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0084] It is understood that although the accompanying drawings may show a specific order of method steps, the order of the steps may differ from the depicted order. Furthermore, two or more steps may be performed simultaneously or partially simultaneously. Such variations will depend on the chosen software and hardware, as well as the designer's choices. All such variations are within the scope of this disclosure.

[0085] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0086] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0087] Train pipe pressure refers to the target pressure when the train pipe in the air braking system is fully filled before braking. The train pipe pressure is controlled by the equalization cylinder pressure.

[0088] As attached Figures 1 to 4 As shown, in one illustrative embodiment of the train pipe constant pressure conversion system of the present invention, the train pipe constant pressure conversion system includes:

[0089] Main air duct;

[0090] Relay valve 1, whose inlet is connected to the main air duct;

[0091] Train pipe 2 is connected to the output port of relay valve 1;

[0092] The equalizing air cylinder 3 is connected to the control port of the relay valve 1;

[0093] Also includes:

[0094] The first equalizing pressure regulating valve 4 has its input port connected to the main air duct.

[0095] The second equalizing pressure regulating valve 5 has its input port connected to the main air duct, and its set value is greater than that of the first equalizing pressure regulating valve 4.

[0096] The switching valve 6 has a first air inlet 61 connected to the output port of the first equalizing pressure regulating valve 4, and a second air inlet 62 connected to the output port of the second equalizing pressure regulating valve 5.

[0097] The electric interlocking changeover valve 7 has its first end connected to the main air duct and its second end connected to the pre-control port 63 of the switching valve.

[0098] Electric interlock switch 11, which is connected to electric interlock changeover valve 7;

[0099] The air circuit cut-off unit is connected between the switching valve 6 and the equalizing air cylinder 3. The air circuit cut-off unit has a first working state: the air circuit cut-off unit connects the switching valve 6 and the equalizing air cylinder 3; and a second working state: the air circuit cut-off unit disconnects the switching valve 6 and the equalizing air cylinder 3 for a period of time and then reconnects them.

[0100] The exhaust unit is connected to the equalizing air cylinder 3. The exhaust unit has the following functions: a third working state in which the exhaust unit disconnects the equalizing air cylinder 3 from the outside; and a fourth working state in which the exhaust unit connects the equalizing air cylinder 3 to the outside for a period of time before disconnecting it.

[0101] refer to Figures 1 to 4 When the outlet 72 of the electric interlock switching valve is connected to the exhaust port 73, there is no preset air pressure in the pre-control port 63 of the switching valve, the second air inlet 62 of the switching valve is connected to the outlet 64 of the switching valve, the electric interlock switch 11 is disconnected so that the air circuit cut-off unit is in the first working state and the exhaust unit is in the third working state.

[0102] refer to Figure 5 , Figure 6 and Figure 7 When the air inlet 71 and air outlet 72 of the electric interlock switching valve are connected, the pre-control port 63 of the switching valve has a preset air pressure, which connects the first air inlet 61 of the switching valve with the air outlet 64 of the switching valve. At the same time, the electric interlock switching valve 7 outputs a feedback signal to the electric interlock switch 11, which closes the electric interlock switch 11, so that the air circuit cut-off unit enters the second working state and the exhaust unit enters the fourth working state.

[0103] In the above illustrative embodiment, the train pipe constant pressure conversion system simplifies the locomotive's constant pressure conversion into a single operation. By controlling the connection between the air inlet 71 and the air outlet 72 of the electric interlock conversion valve, or between the air outlet 72 and the exhaust outlet 73 of the electric interlock conversion valve, the train pipe constant pressure can be switched between the set value of the first equalizing pressure regulating valve 4 and the set value of the second equalizing pressure regulating valve 5. Furthermore, referring to... Figure 5 and Figure 6 When switching from the second equalizing pressure regulating valve 5 to the first equalizing pressure regulating valve 4, the electric interlock feedback signal of the electric interlock switching valve 7 controls the electric interlock switch 11, causing the air circuit cut-off unit to be cut off for a certain period of time, thus cutting off the air supply passage of the equalizing air cylinder 3 for a period of time. At the same time, the exhaust unit connected to the equalizing air cylinder 3 is briefly connected to the outside, so that the exhaust passage of the equalizing air cylinder 3 is open for a period of time, forcing the pressure of the equalizing air cylinder 3 to drop to a certain extent, so as to ensure that the pressure reduction of the train pipe is large enough, so that an effective pressure difference can be formed between the train pipe and the locomotive working air cylinder or the vehicle auxiliary air cylinder during refilling, and the locomotive and vehicles can be relieved normally; Reference Figure 7After a period of time, the air supply passage of the equalizing air cylinder 3 is restored, while the air exhaust passage of the equalizing air cylinder 3 is cut off to ensure that the equalizing air cylinder 3 can perform normal air supply and exhaust control according to external commands.

[0104] In the train pipe constant pressure conversion system provided in this embodiment, the first equalizing pressure regulating valve 4 and the second equalizing pressure regulating valve 5 correspond to two constant pressures of the train pipe, respectively. For example, for railway freight trains, the constant pressures of the train pipe are 500 kPa and 600 kPa. In this embodiment, the first and second equalizing pressure regulating valves are pressure regulating valves, with the setpoint of the first equalizing pressure regulating valve 4 being 500 kPa and the setpoint of the second equalizing pressure regulating valve 5 being 600 kPa. The electric interlocking conversion valve 7 is a two-position three-way valve with electric interlocking feedback, and it has two positions: "constant pressure 600 kPa" and "constant pressure 500 kPa". When the pressure is set to "600 kPa", the electric interlocking changeover valve cuts off the main air supply path, and the pressure at the pre-control port 63 of the switching valve is discharged to the atmosphere through the outlet 72 and exhaust port 73 of the electric interlocking changeover valve. When the pressure is set to "500 kPa", the inlet 71 and outlet 72 of the electric interlocking changeover valve are connected, and the main air is transmitted to the pre-control port 63 of the switching valve through the electric interlocking changeover valve 7, while simultaneously outputting a high-level feedback signal. The switching valve 6 controls the pressure switching based on whether there is pressure at the pre-control port 63.

[0105] The switching valve 6 is a two-position three-way valve. When the electric interlock switching valve is in the "fixed pressure 600kPa" position, since there is no pressure at the pre-control port 63 of the switching valve, the second air inlet 62 communicates with the air outlet 64 under the action of the spring pressure at the bottom of the switching valve 6. When the electric interlock switching valve is in the "fixed pressure 500kPa" position, the switching valve 6 overcomes the spring pressure at the bottom of the switching valve 6 under the action of the total air pressure at the pre-control port 63, so that the first air inlet 61 communicates with the air outlet 64.

[0106] refer to Figure 1 , Figure 5 and Figure 7 In another illustrative embodiment, the gas path cutoff unit includes:

[0107] Shutdown valve 9, the air inlet of shutdown valve 9 is connected to the air outlet of switching valve 6, and the air outlet of shutdown valve 9 is connected to equalizing air cylinder 3.

[0108] The shut-off solenoid valve 8 is electrically connected to the electric interlock switch 11. The air inlet of the shut-off solenoid valve 8 is connected to the main air duct, and the air outlet of the shut-off solenoid valve 8 is connected to the pre-control port of the shut-off valve 9.

[0109] When the shut-off solenoid valve 8 is de-energized, the air inlet and outlet of the shut-off solenoid valve 8 are disconnected, the preset control port of the shut-off valve 9 does not have preset air pressure, and the air inlet and outlet of the shut-off valve 9 remain connected.

[0110] When the shut-off solenoid valve 8 is energized, the air inlet of the shut-off solenoid valve 8 is connected to the air outlet of the shut-off solenoid valve 8, and the pre-control port of the shut-off valve 9 has a preset air pressure. The air inlet and outlet of the shut-off valve 9 are disconnected for a period of time and then connected again.

[0111] In the first operating state, the shut-off solenoid valve 8 is de-energized; in the second operating state, the shut-off solenoid valve 8 is energized for a period of time and then de-energized. The shut-off solenoid valve 8 is a two-position three-way solenoid valve. The shut-off valve is a two-position two-way valve, used to control the opening and closing of the air path from the switching valve to the equalizing cylinder based on the presence or absence of pressure at the pre-control port. The air path cut-off unit can also use a high-flow solenoid valve independently, which is used to cut off the air supply path of the equalizing cylinder for a certain period of time when the electric interlock switching valve changes from "constant pressure 600kPa" to "constant pressure 500kPa".

[0112] refer to Figure 1 , Figure 5 and Figure 7 In another illustrative embodiment, the exhaust unit includes:

[0113] The exhaust solenoid valve 10 has an air inlet connected to the equalizing air cylinder 3. When the exhaust solenoid valve is energized, the air inlet and exhaust outlet of the exhaust solenoid valve 10 are connected, and the equalizing air cylinder 3 exhausts air to the outside. When the exhaust solenoid valve 10 is de-energized, the air inlet and exhaust outlet of the exhaust solenoid valve 10 are disconnected, and the equalizing air cylinder 3 maintains pressure.

[0114] In the third operating state, the exhaust solenoid valve 10 is de-energized; in the fourth operating state, the exhaust solenoid valve 10 remains energized for a period of time before being de-energized. The exhaust solenoid valve is a two-position, two-way solenoid valve. The exhaust unit can also use a combination control method of pilot solenoid valve and vent valve. This is used to ensure that when the electric interlock switching valve changes from "constant pressure 600kPa" to "constant pressure 500kPa", the pressure of the equalizing air cylinder decreases to a certain extent within a certain period of time, ensuring that when the constant pressure is 500 kPa, the pressure of the train pipe for refilling air and the pressure of the auxiliary air cylinder of individual vehicles form a normal relief pressure difference (generally at least 20kPa). For example, the exhaust unit can control the equalizing air cylinder to discharge pressure to zero.

[0115] refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In another illustrative embodiment, the train pipe constant pressure conversion system further includes:

[0116] The first power-off delay relay K11 is connected in series with the trip solenoid valve 8 and the electrical interlock switch 11.

[0117] The second power-off delay relay K12 is connected in series with the exhaust solenoid valve 10 and the electrical interlock switch 11.

[0118] When the interlock switch 11 is closed, the first power-off delay relay K11 is energized, and the solenoid valve 8 enters the second working state. At the same time, the second power-off delay relay K12 is energized, and the exhaust solenoid valve 10 enters the fourth working state.

[0119] When the first power-off delay relay K11 is energized, its normally open contact closes, energizing the shut-off solenoid valve 8. After the delay ends, the normally open contact of the first power-off delay relay K11 opens, de-energizing the shut-off solenoid valve 8.

[0120] The second power-off delay relay K12 is energized, and its normally open contact closes, energizing the exhaust solenoid valve 10. After the delay, the normally open contact of the second power-off delay relay K12 opens, de-energizing the exhaust solenoid valve 10. During de-energization, the normally open contacts of power-off delay relays K11 and K12 remain open. The pressure reduction can be controlled by adjusting the delay duration of the first power-off delay relay.

[0121] In another illustrative embodiment, the train pipe constant pressure conversion system further includes:

[0122] The solenoid valve 12 is located between the air circuit cutoff unit and the equalizing air cylinder 3. The outlet of the solenoid valve 12 is connected to the equalizing air cylinder. When the solenoid valve 12 is energized, the inlet and outlet of the solenoid valve 12 are connected, and the equalizing air cylinder 3 is filled with air. When the solenoid valve 12 is de-energized, the inlet and outlet of the solenoid valve 12 are disconnected, and the equalizing air cylinder 3 maintains pressure.

[0123] The brake solenoid valve 13 has an air inlet connected to the equalizing air cylinder 3 and an air outlet connected to the exhaust port. When the brake solenoid valve 13 is energized, its air inlet and outlet are connected, and the equalizing air cylinder 3 exhausts air. When the brake solenoid valve 13 is de-energized, its air inlet and outlet are disconnected, and the equalizing air cylinder 3 maintains pressure.

[0124] In another illustrative embodiment, the train pipe constant pressure conversion system further includes:

[0125] The brake control unit controls the brake solenoid valve 13 and the release solenoid valve 12 according to the braking or release command of the train. Under the braking command, the brake control unit controls the brake solenoid valve 13 to be energized and the release solenoid valve 12 to be de-energized, and the equalizing air cylinder 3 exhausts air through the brake solenoid valve 13. Under the release command, the brake control unit controls the brake solenoid valve 13 to be de-energized and the release solenoid valve 12 to be energized, and the equalizing air cylinder 3 is filled with air through the release solenoid valve 12.

[0126] Another illustrative embodiment of this application discloses a train pipe constant pressure switching control method, based on the train pipe constant pressure switching system described above, including:

[0127] Receive the second constant pressure conversion command;

[0128] Connect the second equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a second set pressure value;

[0129] The relay valve amplifies the pressure, allowing the train pipe to obtain a second constant pressure.

[0130] Receive the first constant pressure conversion command;

[0131] Control the pressure reduction of the equalizing air cylinder;

[0132] Connect the first equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a first set pressure value;

[0133] The relay valve amplifies the pressure, allowing the train pipe to obtain its first constant pressure.

[0134] Wherein, the first set value is less than the second set value.

[0135] The first constant pressure conversion command is converted by the electric interlocking switching valve to a preset air pressure at the pre-control port 63 of the switching valve when the air inlet 71 and outlet 72 of the electric interlocking switching valve are connected. The second constant pressure conversion command is converted by the electric interlocking switching valve to a preset air pressure at the pre-control port 63 of the switching valve when the air outlet 72 and exhaust port 73 of the electric interlocking switching valve are connected. It is worth noting that there is no order restriction between the second and first constant pressure conversion commands. Whether the first or second constant pressure conversion command is used depends on the constant pressure before the constant pressure conversion in the train pipe. For example, if the constant pressure in the train pipe is 500 kPa, and the constant pressure is converted to 600 kPa, from low pressure to high pressure, it is based on the received second constant pressure conversion command.

[0136] In another illustrative embodiment, the train pipe constant pressure switching control method includes:

[0137] The electrical interlocking switch valve cutting off the pressure transmission of the main air duct to the pre-control port of the switching valve is regarded as issuing the second constant pressure switching command;

[0138] The second air inlet and outlet of the switching valve are connected, thereby connecting the second equalizing pressure regulating valve and the switching valve.

[0139] The normally open contact of the electrical interlock switch is not closed;

[0140] The air circuit cut-off unit connects the second equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit disconnects the equalizing air cylinder from the outside, thereby connecting the second equalizing pressure regulating valve, the switching valve, and the shut-off valve, so that the equalizing air cylinder obtains the pressure of the second set value;

[0141] The relay valve amplifies the pressure, allowing the train pipe to obtain the second constant pressure.

[0142] The electric interlock switching valve transmits the pressure of the main air duct to the pre-control port of the switching valve, which is regarded as issuing the first constant pressure switching command;

[0143] The first air inlet and the air outlet of the switching valve are connected, thereby connecting the first equalizing pressure regulating valve and the switching valve.

[0144] The electric interlock switch receives the feedback signal from the electric interlock changeover valve, and its normally open contact closes.

[0145] The air circuit cut-off unit cuts off the connection between the first equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit connects the equalizing air cylinder to the outside, so that the equalizing air cylinder is depressurized;

[0146] The air circuit cut-off unit connects the second equalizing pressure regulating valve and the equalizing air cylinder. The exhaust unit disconnects the equalizing air cylinder from the outside and then connects the first equalizing pressure regulating valve and the equalizing air cylinder, so that the equalizing air cylinder obtains a first set pressure value.

[0147] The relay valve amplifies the pressure, allowing the train pipe to obtain the first constant pressure.

[0148] In another illustrative embodiment, the train pipe constant pressure switching control method includes:

[0149] The gas circuit cutoff unit and the electrical interlock switch are connected in series to the first power-off delay relay;

[0150] The exhaust unit and the electrical interlock switch are connected in series with a second power-off delay relay;

[0151] When the electrical interlock switch is closed, the first power-off delay relay is energized, the air circuit cut-off unit cuts off the connection between the first equalizing pressure regulating valve and the equalizing air cylinder, and at the same time, the second power-off delay relay is energized, the exhaust unit connects the equalizing air cylinder to the outside, so that the equalizing air cylinder is depressurized;

[0152] After the delay ends, the air circuit cut-off unit connects the first equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit disconnects the equalizing air cylinder from the outside, thereby connecting the first equalizing pressure regulating valve, the shut-off valve and the equalizing air cylinder, so that the equalizing air cylinder obtains the pressure of the first set value.

[0153] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0154] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A train pipe constant pressure conversion system, characterized in that, include: Main air duct; Intermediate valve, the inlet of which is connected to the main air duct; The train pipe is connected to the output port of the relay valve; A balancing air cylinder, which is connected to the control port of the relay valve; Also includes: The first equalizing pressure regulating valve has its input port connected to the main air duct. The second equalizing pressure regulating valve has its input port connected to the main air duct, and its set value is greater than that of the first equalizing pressure regulating valve. A switching valve, wherein the first air inlet of the switching valve is connected to the output port of the first equalizing pressure regulating valve. The second air inlet of the switching valve is connected to the output port of the second equalizing pressure regulating valve; An electric interlocking changeover valve, the first end of which is connected to the main air duct, and the second end of which is connected to the pre-control port of the switching valve; An electric interlock switch, which is connected to the electric interlock changeover valve; An air path cut-off unit is connected between the switching valve and the equalizing air cylinder; the air path cut-off unit has: a first working state in which the air path cut-off unit connects the switching valve and the equalizing air cylinder; and a second working state in which the air path cut-off unit disconnects the switching valve and the equalizing air cylinder for a period of time and then reconnects them. An exhaust unit is connected to the equalizing air cylinder. The exhaust unit has the following functions: a third working state in which the exhaust unit disconnects the equalizing air cylinder from the outside; and a fourth working state in which the exhaust unit connects the equalizing air cylinder to the outside for a period of time before disconnecting it. When the outlet and exhaust port of the electric interlock switching valve are connected, there is no preset air pressure at the pre-control port of the switching valve, the second inlet and outlet of the switching valve are connected, the electric interlock switch is disconnected, the air circuit cut-off unit is in the first working state, and the exhaust unit is in the third working state. When the air inlet and outlet of the electric interlock switching valve are connected, the pre-control port of the switching valve has a preset air pressure, the first air inlet and outlet of the switching valve are connected, the electric interlock switch is closed, the air circuit cut-off unit enters the second working state, and the exhaust unit enters the fourth working state.

2. The train pipe constant pressure conversion system according to claim 1, characterized in that, The gas path cutoff unit includes: A shut-off valve, wherein the air inlet of the shut-off valve is connected to the air outlet of the switching valve, and the air outlet of the shut-off valve is connected to the equalizing air cylinder. A shut-off solenoid valve is electrically connected to the electrical interlock switch. The air inlet of the shut-off solenoid valve is connected to the main air duct, and the air outlet of the shut-off solenoid valve is connected to the pre-control port of the shut-off valve. When the shut-off solenoid valve is de-energized, the air inlet of the shut-off solenoid valve is disconnected from the air outlet of the shut-off solenoid valve, there is no preset air pressure at the pre-control port of the shut-off valve, and the air inlet and air outlet of the shut-off valve remain connected. When the shut-off solenoid valve is energized, the air inlet of the shut-off solenoid valve is connected to the air outlet of the shut-off solenoid valve, the pre-control port of the shut-off valve has a preset air pressure, and the air inlet and outlet of the shut-off valve are disconnected for a period of time and then connected again. In the first operating state, the shut-off solenoid valve is de-energized; in the second operating state, the shut-off solenoid valve is energized for a period of time and then de-energized.

3. The train pipe constant pressure conversion system according to claim 2, characterized in that, The exhaust unit includes: An exhaust solenoid valve is provided, the air inlet of which is connected to the equalizing air cylinder; when the exhaust solenoid valve is energized, the air inlet and exhaust outlet of the exhaust solenoid valve are connected, and the equalizing air cylinder exhausts air to the outside; when the exhaust solenoid valve is de-energized, the air inlet and exhaust outlet of the exhaust solenoid valve are disconnected, and the equalizing air cylinder maintains pressure. In the third working state, the exhaust solenoid valve is de-energized; in the fourth working state, the exhaust solenoid valve remains energized for a period of time before being de-energized.

4. The train pipe constant pressure conversion system according to claim 3, characterized in that, Also includes: The first power-off delay relay is connected in series with the shutdown solenoid valve and the electrical interlock switch; The second power-off delay relay is connected in series with the exhaust solenoid valve and the electrical interlock switch; When the electrical interlock switch is closed, the first power-off delay relay is energized, and the shut-off solenoid valve enters the second working state. At the same time, the second power-off delay relay is energized, and the exhaust solenoid valve enters the fourth working state.

5. The train pipe constant pressure conversion system according to claim 4, characterized in that, When the first power-off delay relay is energized, its normally open contact closes, energizing the shut-off solenoid valve. After the delay ends, the normally open contact of the first power-off delay relay opens, de-energizing the shut-off solenoid valve. When the second power-off delay relay is energized, its normally open contact closes, energizing the exhaust solenoid valve. After the delay ends, the normally open contact of the second power-off delay relay opens, de-energizing the exhaust solenoid valve.

6. The train pipe constant pressure conversion system according to claim 1, characterized in that, Also includes: A relief solenoid valve is provided, which is located between the air circuit cutoff unit and the equalizing air cylinder. The air outlet of the relief solenoid valve is connected to the equalizing air cylinder. When the relief solenoid valve is energized, the air inlet and outlet of the relief solenoid valve are connected, and the equalizing air cylinder is filled with air. When the relief solenoid valve is de-energized, the air inlet and outlet of the relief solenoid valve are disconnected, and the equalizing air cylinder maintains pressure. A brake solenoid valve, wherein the air inlet of the brake solenoid valve is connected to the equalizing air cylinder, and the air outlet of the brake solenoid valve is connected to the exhaust port; when the brake solenoid valve is energized, the air inlet and outlet of the brake solenoid valve are connected, and the equalizing air cylinder exhausts air; when the brake solenoid valve is de-energized, the air inlet and outlet of the brake solenoid valve are disconnected, and the equalizing air cylinder maintains pressure.

7. The train pipe constant pressure conversion system according to claim 6, characterized in that, Also includes: A braking control unit, which controls the braking solenoid valve and the release solenoid valve according to the braking or release command of the train; Under the braking command, the braking control unit controls the braking solenoid valve to be energized and the release solenoid valve to be de-energized, and the equalizing air cylinder exhausts air through the braking solenoid valve; under the release command, the braking control unit controls the braking solenoid valve to be de-energized and the release solenoid valve to be energized, and the equalizing air cylinder is filled with air through the release solenoid valve.

8. A train pipe constant pressure switching control method, based on the train pipe constant pressure switching system as described in any one of claims 2 to 5, characterized in that, include: Receive the second constant pressure conversion command; Connect the second equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a second set pressure value; The relay valve amplifies the pressure, allowing the train pipe to obtain a second constant pressure. Receive the first constant pressure conversion command; Control the pressure reduction of the equalizing air cylinder; Connect the first equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a first set pressure value; The relay valve amplifies the pressure, allowing the train pipe to obtain its first constant pressure. Wherein, the first set value is less than the second set value.

9. The train pipe constant pressure switching control method according to claim 8, characterized in that, include: The electrical interlocking switch valve cutting off the pressure transmission of the main air duct to the pre-control port of the switching valve is regarded as issuing the second constant pressure switching command; The second air inlet and outlet of the switching valve are connected, thereby connecting the second equalizing pressure regulating valve and the switching valve. The normally open contact of the electrical interlock switch is open; The air circuit cut-off unit connects the second equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit disconnects the equalizing air cylinder from the outside, thereby connecting the second equalizing pressure regulating valve, the switching valve, and the shut-off valve, so that the equalizing air cylinder obtains the pressure of the second set value; The relay valve amplifies the pressure, allowing the train pipe to obtain the second constant pressure. The electric interlock switching valve transmits the pressure of the main air duct to the pre-control port of the switching valve, which is regarded as issuing the first constant pressure switching command; The first air inlet and the air outlet of the switching valve are connected, thereby connecting the first equalizing pressure regulating valve and the switching valve. The electric interlock switch receives the feedback signal from the electric interlock changeover valve, and its normally open contact closes. The air circuit cut-off unit cuts off the connection between the first equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit connects the equalizing air cylinder to the outside, so that the equalizing air cylinder is depressurized; The air circuit cut-off unit connects the second equalizing pressure regulating valve and the equalizing air cylinder. The exhaust unit disconnects the equalizing air cylinder from the outside and then connects the first equalizing pressure regulating valve and the equalizing air cylinder, so that the equalizing air cylinder obtains a first set pressure value. The relay valve amplifies the pressure, allowing the train pipe to obtain the first constant pressure.

10. The train pipe constant pressure switching control method according to claim 9, characterized in that: The gas circuit cutoff unit and the electrical interlock switch are connected in series to the first power-off delay relay; The exhaust unit and the electrical interlock switch are connected in series with a second power-off delay relay; When the electrical interlock switch is closed, the first power-off delay relay is energized, the air circuit cut-off unit cuts off the connection between the first equalizing pressure regulating valve and the equalizing air cylinder, and at the same time, the second power-off delay relay is energized, the exhaust unit connects the equalizing air cylinder to the outside, so that the equalizing air cylinder is depressurized; After the delay ends, the air circuit cut-off unit connects the first equalizing pressure regulating valve and the equalizing air cylinder, and the exhaust unit disconnects the equalizing air cylinder from the outside, thereby connecting the first equalizing pressure regulating valve, the shut-off valve and the equalizing air cylinder, so that the equalizing air cylinder obtains the pressure of the first set value.

11. A train pipe constant pressure switching control method, based on the train pipe constant pressure switching system as described in any one of claims 1, 6-7, characterized in that, include: Receive the second constant pressure conversion command; Connect the second equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a second set pressure value; The relay valve amplifies the pressure, allowing the train pipe to obtain a second constant pressure. Receive the first constant pressure conversion command; Control the pressure reduction of the equalizing air cylinder; Connect the first equalizing pressure regulating valve to the equalizing air cylinder, so that the equalizing air cylinder obtains a first set pressure value; The relay valve amplifies the pressure, allowing the train pipe to obtain its first constant pressure. Wherein, the first set value is less than the second set value.

Images