Emergency valve for high-speed motor train units and urban rail transit vehicles

Abstract

The invention relates to an emergency valve for high-speed motor train units and urban rail transit vehicles. The emergency valve comprises a pneumatic control valve and an electromagnetic valve mounted on the pneumatic control valve, the electromagnetic valve is connected with a control air channel of the pneumatic control valve, the pneumatic control valve comprises a valve body assembly, a spool assembly and a piston, the spool assembly and the piston are both mounted in an inner cavity of the valve body assembly in a sleeved manner, a piston spring is arranged between the piston and the valve body assembly, a spring seat is mounted at one end of the valve body assembly, an end cap is mounted at the other end of the valve body assembly, and a retaining spring is arranged between the spool assembly and the spring seat. Three air channel ports are arranged on the valve body assembly and are respectively communicated with the inner cavity of the valve body assembly. Emergency braking of the emergency valve is controlled by power on and power off of the electromagnetic valve, once the electromagnetic valve is powered off due to manipulation of a driver or other reasons, the emergency valve cuts off a closed circuit of a pneumatic and electric conversion valve and a relay valve and connects a closed circuit of a braking air storage cylinder and the relay valve so as to achieve emergency braking, and response time of the emergency valve to an emergency braking instruction is not longer than 0.2s.

Description

technical field [0001] The invention relates to a braking control device for railway vehicles, in particular to an emergency valve for high-speed EMUs and urban rail transit vehicles. Background technique [0002] High-speed EMUs and urban rail transit vehicles mainly use computer-controlled through-electro-pneumatic braking systems, and emergency braking is an important function of the braking system. The emergency valve is the emergency braking action control part of the braking system of high-speed EMUs and urban rail transit vehicles. It is one of the core key parts of the braking control unit. , play a key role. The existing emergency valve has a long emergency braking response time, cannot guarantee stopping within a short braking distance, and has poor reliability and safety performance. Contents of the invention [0003] The present invention aims at the above-mentioned shortcomings of the existing emergency valve in the braking process, such as long response tim...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the above-mentioned shortcomings of the existing emergency valve in the braking process, such as long response time, poor reliability and safety, etc., and provides a high-speed motor vehicle that can meet the emergency braking action control requirements of the microcomputer-controlled direct-through electro-pneumatic braking system Emergency valves for group and urban rail transit vehicles, which can reliably produce emergency braking in emergency situations

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