Pear-shaped hole equipped braking distribution valve for heavy-loaded long and large train

Abstract

A pear-shaped hole equipped braking distribution valve for a heavy-loaded long and large train includes a slide valve and a slide valve seat, wherein the slide valve and the slide valve seat are provided with a slide valve braking charging hole and a slide valve seat hole respectively, and the slide valve slides up and down along the slide valve seat to realize overlap / non-overlap between the slide valve braking charging hole and the slide valve seat hole. The linear relation between the slide valve movement distance and the overlap area between the slide valve braking charging hole and the slide valve seat hole is divided into two segments, that is, the segment from a non-braking position of the slide valve to 1 / 2-2 / 3 of the slide valve maximum movement distance satisfies the linear relation y1=k1x1, and the segment from 1 / 2-2 / 3 of the slide valve maximum movement distance to the slide valve maximum movement distance satisfies the linear relation y2=ymax-k2x2. According to the invention, the pressure difference between vehicle brake cylinders at train front and back parts is reduced, without changing the existing train braking capacity, to improve consistency of charging speeds of the vehicle brake cylinders at the train front and back parts and reduce longitudinal impulse of the heavy-loaded long and large train; and the implementation method is simple and there is small modification on the original structure.

Description

technical field [0001] The invention belongs to the technical field of train braking, and in particular relates to a distribution valve for heavy-duty long train braking. Background technique [0002] Heavy-duty long trains are the development direction of freight trains in the world. The increase in axle load and the number of formations are the main development modes of heavy-duty transportation. Increasing the number of train formations is the most common form of heavy-duty transportation currently used in my country. The increase in the number of formations significantly increases the length of the train, and the difference in the inflation speed of the brake cylinders of the vehicles at the front and rear of the train increases significantly, which brings about a sharp increase in the longitudinal impulse of the train. Excessive train longitudinal impulse not only brings the risk of coupler breakage, but also brings great hidden dangers to transportation safety. At the ...

AI Technical Summary

Problems solved by technology

In single-breed trains, the decompression speed of the front train pipe is faster, and the decompression speed of the rear train pipe slows down, which results in a long moving distance of the slide valve of the front car, large air holes in the brake cylinder, and strong braking ability. , the moving distance of the slide valve of the rear vehicle is short, the air hole of the brake cylinder is small, and the braking ability is weak. The difference in the braking ability of each vehicle in the train leads to excessive longitudinal impulse of the train

Existing vehicle distribution valves can cause excessive longitudinal forces on the train during frequent braking

In combined trains, the train pipe decompression speed of the vehicles close to the locomotive is similar to that of the front vehicles in the single train, and the decompression speed of the train tubes of the vehicles far away from the locomotive is similar to that of the rear vehicles of the single train, and the combined train also has the train longitudinal impulse big problem

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