RU2794299C1 - Safety brake valve pneumatic bypass unit - Google Patents

Abstract

FIELD: railway transport; subway.

SUBSTANCE: invention relates to the brake system of a multi-unit rolling stock with an automatic electro-pneumatic brake. The unit includes a plate, on which a pressure limiting valve and a safety circuit recovery valve are installed, on the body of which a shunt valve and a safety brake valve are installed, the input of which is connected by a pneumatic line L1 to the pneumatic line of the auto mode, and the output by a pneumatic line L2 is connected to the inlet of the bypass valve and the control input of the safety circuit recovery valve, the shunt valve output is connected by a pneumatic line L3 to the control chamber of the pressure switch, one control input of the shunt valve is connected to the safety circuit restoration valve output by a pneumatic line L4, the other control input of the shunt valve is connected by a pneumatic line L6 to the pressure limiting valve output, the input of which is connected to the brake line by a pneumatic line L5.

EFFECT: increase in the reliability and safety of the braking system of the rolling stock of the railway transport and the subway.

1 cl, 2 dwg

Description

The invention relates to the field of railway transport and the subway, namely, to the braking system of multiple unit rolling stock with an automatic electro-pneumatic brake ("safety loop" circuit).

Known block of brake equipment, mainly metro rolling stock, containing a bracket-plate with pneumatic channels, on which pneumatic devices are mounted, including an air distributor associated with the brake line, communicated through a switching valve with a pressure switch, a transport mode unit consisting of a gearbox and a three-way valve, and electro-pneumatic control devices, including electro-pneumatic brake valves, a safety brake valve connected to the supply line and a reserve tank, an electronic automatic pressure regulator connected by a channel to an air distributor, a safety brake valve, a transport mode unit, a parking brake unit connected to the pressure line, an electronic control unit brake and pressure sensors installed on the channels of the lines, air distributor and switching valve, electronic automatic pressure regulator, cylinders, air springs, signaling device and pressure sensor on the parking brake cylinder channel, characterized in that it is equipped with an automatic pneumatic brake included in the circuit and installed on the electronic channel automatic pressure regulator with an electro-pneumatic valve, a second switching valve, a pressure sensor, while the switching valves are made with priority, and the spare tank is installed in the casing /Patent of the Russian Federation for utility model RU 198428 U1, 07/08/2020/.

The disadvantage of the known block of brake equipment (BTO) is that in the event of a malfunction of the safety brake valve (VTB) - spontaneous opening as a result of a breakdown of the locking element or removal of voltage from it, the car performs emergency braking. A shunt valve (23) is provided for quick troubleshooting. When a voltage of 75 volts DC is applied to it, the brakes are released. If, in addition to a valve (22) malfunction, the car’s on-board voltage of 75 Volts has disappeared, a manually operated uncoupling valve is provided, to interact with which you need to get out of the driver’s cab, go to the car with a faulty VTB and perform shunting.

The technical result, which will be obtained by implementing the proposed block of the pneumatic circuit for shunting the safety brake valve, is to increase the reliability and safety of the braking system of the railway and subway rolling stock. The use of the proposed block allows the rolling stock to quickly clear the path in the event of a malfunction of the safety loop circuit when the train follows the schedule even in the absence of electric current, without leaving the driver's cab.

The specified technical result is achieved in that the block of the pneumatic circuit for shunting the safety brake valve includes a plate on which a pressure limiting valve and a safety circuit recovery valve are installed, on the body of which a shunt valve and a safety brake valve are installed, the input of which is connected by a pneumatic line L1 to the automatic mode pneumatic line , and the output by pneumatic line L2 is connected to the bypass valve input and the control input of the safety circuit restoration valve, the bypass valve output by pneumatic line L3 is connected to the control chamber of the pressure switch, one control input of the bypass valve is connected to the safety circuit restoration valve output by pneumatic line L4, the other control the inlet of the bypass valve is connected by a pneumatic line L6 to the outlet of the pressure limiting valve, the inlet of which is connected to the brake line by a pneumatic line L5.

In FIG. 1 - schematically shows the block of the pneumatic circuit for shunting the safety brake valve, general view.

In FIG. 2 - the same is shown, a pneumatic circuit diagram.

The safety brake valve shunt pneumatic circuit block includes a plate (1) on which a pressure limiting valve (2) and a safety circuit recovery valve (3) are installed, on the body of which a shunt valve (4) and a safety brake valve (5) are installed, inlet which is connected by pneumatic line L1 to the automatic mode pneumatic line (6), and the output is connected by pneumatic line L2 to the inlet of the bypass valve (4) and the control input of the safety circuit recovery valve (3), the outlet of the bypass valve (4) is connected to the control cavity by the pneumatic line L3 pressure switch (7), one control input of the bypass valve (4) is connected to the output of the safety circuit recovery valve (3) by pneumatic line L4, the other control input of the bypass valve (4) is connected by pneumatic line L6 to the output of the pressure limiting valve (2), input which is connected to the brake line (8) pneumatic line L5.

The electro-pneumatic safety brake valve (5) performs the function of automatic electro-pneumatic braking "safety loop". The safety brake valve is included in the train safety brake circuit (“loop”) and is energized in normal mode.

When the "safety loop" breaks, power is removed from the safety brake valve (5) and the control input of the pressure switch (7) is filled through the shunt valve (4). The emergency brake is activated simultaneously along the entire length of the train. To release the brake, it is necessary to restore the power supply to the electro-pneumatic valve of the VTB safety brake (5). Due to the implementation of the pneumatic shunting circuit block, remote wagon-by-car shutdown of the "safety loop" is provided as follows.

When the train is moving, VTB (5) is energized. Line L1 is disconnected from line L2. Line L2 is connected to the atmosphere. The safety circuit recovery valve (3) is in the “open” position under the action of the spring. Line L1 is connected to line L4. The compressed air from auto mode (6) holds the shunt valve (4) in the "open" position. Line L3 connects to line L2 and to the atmosphere. The pressure in the brake line, line L5, corresponds to the train pressure. The brakes of the rolling stock are in the "vacation" state.

When the supply voltage from the VTB (5) fails, the L1 line is connected to the L2 line and the L3 line. Compressed air from auto mode (6) passes into the control cavity of the pressure switch (7). The rolling stock is decelerating. At the same time, compressed air in line L2 acts on the safety circuit recovery valve (3) by separating line L4 from line L1 and connecting line L4 to the atmosphere.

When the pressure in the brake line (8) increases to the supercharged pressure limiting valve (2), it connects the L5 line to the L6 line and the brake line (8). Compressed air from the brake line (8) acts on the shunt valve (4), and it separates lines L3 and L2 and connects line L3 to the atmosphere. There is a complete release of the brakes of the rolling stock. After reducing the pressure in the brake line (8) to the train pressure limiting valve (2) will disconnect the line L6 and L5. Line L6 will communicate with the atmosphere. At the same time, the bypass valve (4) will retain its position, communicating line L3 with the atmosphere.

When the power supply to VTB (5) is restored, air will be discharged from line L2 into the atmosphere. The safety circuit recovery valve (3) switches under the action of the spring and connects line L1 to line L4. The shunt valve (4) will switch by connecting line L3 to line L2. Those. the safety loop will be automatically restored.

Thus, the use of this scheme allows the rolling stock to quickly clear the way in the event of a malfunction of the safety loop circuit when the train follows the schedule even in the absence of electric current, without leaving the driver's cab.

Claims (1)

Pneumatic circuit block for shunting the safety brake valve, including a plate on which a pressure limiting valve and a safety circuit recovery valve are installed, on the body of which a shunt valve and a safety brake valve are installed, the input of which is connected by a pneumatic line L1 to the pneumatic line of auto mode, and the output is connected by a pneumatic line L2 connected to the bypass valve input and the control input of the safety loop recovery valve, the bypass valve output is connected by a pneumatic line L3 to the control chamber of the pressure switch, one control input of the bypass valve is connected to the safety loop recovery valve output by a pneumatic line L4, the other control input of the bypass valve is connected by a pneumatic line L6 with the outlet of the pressure limiting valve, the inlet of which is connected to the brake line by the pneumatic line L5.

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