Valve core structure of vacuum electromagnetic regulator with guide sleeve

Abstract

The invention discloses a valve core structure of a vacuum electromagnetic regulator with a guide sleeve. The valve core structure comprises a valve core, an inner hole formed above the valve core, a stopper in the inner hole, a sealing rubber ring, and a spring, wherein the inner hole of the valve hole is a straight-wall hole; a guide sleeve is arranged on the bottom of the inner hole; the spring, which is a conical spring, is arranged above the guide sleeve in such a manner that the large-diameter end of the conical spring faces downwards and is in interference fit with the guide sleeve; the sealing rubber ring is arranged above the spring, and the outer circle of the sealing rubber ring is arranged in the inner cavity of the guide sleeve; the stopper is arranged above the sealing rubber ring; the outer diameter of the stopper is in interference fit with the inner hole; and the upper end face of the stopper is flushed to the upper plane of the inner hole. The friction force of the sealing rubber ring and the spring with the valve core can be reduced by changing the direct contact structure of the sealing rubber ring and a straight spring with the inner hole of the valve core in the prior structure to the guide sleeve structure, and the friction between the straight spring and the inside of the valve core as well as oscillation of the straight spring in the valve core can be obviated by changing the straight spring to the conical spring, thereby reducing friction force of the valve core during movement and obviating failure of the sealing rubber ring caused by long-term movement of the valve core.

Description

technical field [0001] The invention relates to a valve opening adjustment device in an engine tail gas exhaust gas recirculation system (EGR), in particular to a vacuum electromagnetic regulator. Background technique [0002] The vacuum electromagnetic regulator is used as an engine exhaust gas recirculation system (EGR system) to regulate the flow of recirculated exhaust gas. [0003] At present, during the working process of the high-speed moving valve core of the vacuum electromagnetic regulator, the sealing rubber needs to move up and down in the valve core hole continuously. In the original structure, the inner hole of the valve core adopts stepped cylindrical holes with different diameters, such as figure 1 As shown, the sealing rubber cooperates with the inner hole 5, and the straight spring cooperates with the inner hole 6. Since the valve core is made of metal material, the surface roughness of the inner hole cannot achieve high precision. Therefore, the sealing ru...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the existing valve core structure, provide a valve that can improve the performance of the vacuum electromagnetic regulator, and solve the problem of performance degradation and failure of the vacuum electromagnetic regulator caused by the stagnation of the sealing rubber and spring movement in the valve core. core structure

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