Connecting structure of plastic intake manifold and EGR (exhaust gas recirculation) pipe

Abstract

The invention discloses a connecting structure of a plastic intake manifold and an EGR (exhaust gas recirculation) pipe. The connecting structure comprises the plastic intake manifold and the EGR pipe, wherein the EGR pipe is connected to the EGR waste gas inlet interface of the plastic intake manifold by virtue of a bolt through a flange connecting disc; the EGR waste gas inlet interface is arranged right behind the cold air inlet channel of the plastic intake manifold; the EGR waste gas inlet interface is provided with a seal ring; a heat isolating sleeve is welded at the connecting end of the EGR pipe and is horn-shaped; a small end port and the connecting end are welded; a large end port is arranged at the EGR waste gas inlet interface of the plastic intake manifold through a flanging, and is pressed by a connecting flange disc. According to the invention, the temperature of the waste gas after entering the intake manifold can be reduced effectively, the heat which is conducted to the plastic intake manifold from the waste gas can be isolated effectively, and the tightness of the intake manifold is ensured.

Description

technical field [0001] The invention relates to an automobile gasoline engine intake system, in particular to an EGR waste gas cooling, heat insulation and sealing structure for a plastic intake manifold of the intake system. Background technique [0002] With the development of automobile technology, the plastic intake manifold has been widely used in various high and low grade gasoline engines due to its light weight, smooth air passage, high intake efficiency, flexible structural design, and low cost, gradually replacing aluminum Alloy intake manifold trend. [0003] With the strengthening of people's awareness of environmental protection and stricter emission regulations, how to purify exhaust gas is a difficult problem in current engine design and manufacture. Exhaust gas recirculation technology (EGR) is a relatively mature exhaust gas purification technology and has been widely used. In recent years, studies have found that EGR technology can not only purify the exh...

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Problems solved by technology

[0005] The present invention solves the problem that EGR technology is used in plastic intake manifold engines or plastic intake manifolds are used in engines with EGR technology. Due to the high exhaust gas introduced from the EGR valve into the plastic intake manifold, the plastic intake manifold The technical problem of manifold failure during long-term use is to provide a structure that can simultaneously cool, insulate and seal the high-temperature exhaust gas introduced into the plastic intake manifold through the EGR valve

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