Relay valve for brake system of high-speed train

Abstract

The invention relates to a relay valve arranged in an air brake system and playing a role through the change of air pressure inside a control pipeline, in particular to a relay valve for a brake system of a high-speed train. The relay valve comprises a valve body, a movable cavity and a diaphragm plate type piston, wherein the valve body is internally provided with at least two air inlet channels; the movable cavity is arranged in the valve body and communicated with the air inlet channels; and the diaphragm plate type piston is arranged in the movable cavity and controls the air pressure inside the movable cavity through the air inlet channels so that the movable cavity is positioned on a preset position, therefore the integral relay valve can be in a remission state, a brake state and a brake hold state. The invention provides the relay valve for adapting to control strategies of the brake system of the high-speed train, precontrol pressure is input into the relay valve, therefore the relay valve outputs high-flow brake pressure changed with the precontrol pressure to a brake cylinder to achieve the effects of brake, pressure maintaining, remission, and the like of the high-speed train; and in addition, the relay valve can also regulate the output brake cylinder pressure according to the speed grade of the high-speed train.

Description

technical field [0001] The invention relates to a relay valve installed inside the air brake system and functions by controlling the change of gas pressure in the pipeline, more specifically, it refers to a relay valve used in the brake system of high-speed trains . Background technique [0002] The relay valve in the braking system of traditional rail transit vehicles accepts the manipulation of the automatic brake valve and acts according to the pressure change of the equalizing air cylinder to directly control the air filling or exhausting of the train pipe. The braking system using this relay valve It is a traditional train tube decompression braking method. The relay valve is composed of three parts: double-valve port relay valve, total wind shut-off valve and pipe seat. The double-valve relay valve is a single-diaphragm structure, and its function is to control the air filling or exhausting of the main air direction train pipe according to the pressure of the equaliz...

AI Technical Summary

Problems solved by technology

[0003] The relay valve in the high-speed train braking system is used to convert the brake control pressure into the brake cylinder pressure and amplify the flow. At the same time, it can switch the output brake cylinder pressure according to the speed level of the high-speed train to adapt to high-speed Adhesion restrictions at different speeds of trains, and traditional relay valves can no longer meet the technical and application requirements of high-speed train braking systems

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