Mean valve with multiple air circuits

Abstract

The invention discloses a mean valve with multiple air circuits. The mean valve comprises a valve body, a valve seat and a mean piston. A valve cavity is formed in the valve body, the mean piston is arranged in the valve cavity, and the mean piston comprises a piston rod and a plurality of piston bodies, wherein the piston rod is sleeved with the piston bodies, the piston bodies are fixedly arranged on the piston rod, and the areas, under the air pressure action, of the piston bodies are equal. The sides, close to the valve seat, of the piston bodies and the inner wall of the valve body form pressure cavities only communicated with an air pressure inlet channel, and the pressure cavity formed by the side, close to the valve seat, of each piston body and the inner wall of the valve body is connected with a mean pressure outlet. The mean valve is suitable for the mean of two- or more-channel air spring pressure, and it is avoided that when two- or more-channel air spring pressure is processed, a plurality of mean valves need to be connected in parallel or in series, and consequently errors are caused; the concentricity is better, the situations that the friction between the piston and the wall surface of the valve body is enlarged due to overlarge deviations of the concentricity, and the resistance is increased, so that valve action is out of order are avoided.

Description

technical field [0001] The invention relates to the technical field of rail vehicle brake air pressure control valves, in particular to a multi-air path averaging valve. Background technique [0002] The emergency braking force of the rail transit vehicle changes with the change of the load. If the load distribution of the car body is uneven, the real load situation cannot be obtained through the pressure of an air spring. Therefore, in order to weaken the impact of the uneven load, the train brake The control system controls the emergency braking force according to the average pressure of multiple air springs. The averaging valve is mainly used in EMUs and urban rail vehicles. It is a key component of the air suspension control equipment. It can arithmetically average the independent pressure of the air spring, and the output pressure is used as the basis for the brake control system to calculate or adjust the braking force. [0003] At present, the average valves used in ...

AI Technical Summary

Problems solved by technology

With the development of urban rail technology, the accuracy of braking system control is becoming higher and higher. In order to obtain more accurate vehicle weight information, it is necessary to calculate the arithmetic mean of more than two air spring pressures per vehicle. However, at present The average valve does not meet the actual demand

In addition, the existing averaging valve adopts a stepped piston structure, and each air pressure has a different shape on the piston. problem introduces error

[0004] The problems of the average valve currently used are as follows: 1. There is a large deviation between the arithmetic mean value of the output air pressure value and the input air pressure value, and the deviation will vary with the input pressure; 2. In the case of more than two air pressure When averaging, it can only be achieved by connecting multiple averaging valves in parallel or in series, and in the case of parallel or series connection, the deviation between the pressure output value and the arithmetic mean value will also be superimposed, resulting in a large error and cannot accurately represent the vehicle weight information; 3 , At the same time, the upper end of the commonly used averaging valve adopts a slide valve structure. When the two air pressures are similar, the slide valve will stay in the middle position to block the air outlet, resulting in a failure of no pressure output

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