Brake butterfly valve

Abstract

The invention relates to a brake butterfly valve. The brake butterfly valve comprises a valve body, a rotating shaft, a valve plate and a power mechanism, wherein the valve plate is fixedly arranged in an inner cavity in the valve body through the rotating shaft, the valve plate is connected with the power mechanism, the power mechanism drives the valve plate to overturn in the inner cavity by taking the rotating shaft as the center, the inner cavity is separated into an air inlet cavity and an air outlet cavity when the valve plate is switched off, a sealing ring which is used for forming sealing connection with the cavity wall of the inner cavity is fixedly arranged on the valve plate, and sealing surfaces between the sealing ring and the cavity wall of the inner cavity are staggered by a hollow part on the sealing ring. The brake butterfly valve disclosed by the invention has the beneficial effects that the hollow part which is not in contact with the cavity wall of the inner cavity is arranged on the sealing ring and enables the sealing surfaces to be arranged in a staggered way, the area, which is in contact with the inner cavity, of the sealing ring is reduced on the premise that enough width of the sealing ring is ensured, the sealing ring is easily subjected to extrusion deformation to reduce the operation torque when the valve plate is switched on / off, the energy consumption of an engine is reduced, the flexibility of switching on and off the valve plate is ensured, and normal running of an exhaust brake function of the engine is ensured.

Description

technical field [0001] The invention relates to a brake butterfly valve. Background technique [0002] With the increasing requirements of commercial vehicles on the braking system, only relying on upgrading the traditional braking system can no longer fully meet the needs of customers, so auxiliary braking has emerged as the times require, although the auxiliary braking cannot reach the main braking system Such a large braking force is output, but when the vehicle needs to decelerate during driving, the use of auxiliary braking not only reduces the wear of the friction lining, but also has the effect of braking and decelerating. Exhaust brake is a kind of deceleration brake that assists the braking effect of the vehicle. It has a simple structure and low price, and is widely used in trucks or buses equipped with diesel engines. The exhaust brake system usually installs an exhaust brake butterfly valve at the exhaust pipe of the engine. When the exhaust brake does not work,...

AI Technical Summary

Problems solved by technology

However, the sealing ring of this structure has poor elasticity, and the sealing ring and the inner cavity are pressure-forced seals, so the operating torque when the valve is opened and closed is relatively large, which increases the energy loss of the engine and also affects the opening and closing of the valve. flexibility

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