Valve seat structure of double-valve-element hot-end EGR valve

Abstract

The invention relates to the technical field of engine waste gas recirculating, and specifically discloses a valve seat structure of a double-valve-element hot-end EGR valve. The valve seat structurecomprises an integrally cast valve seat, wherein a central hole is formed in the upper part of the valve seat; a gas inlet, a gas exhaust hole, an upper valve sealing hole and a lower valve sealing hole are formed in the valve seat; the gas exhaust hole is provided with a cavity which is in the shape of an external-expansion horn; a gas inlet channel which is upwards bent from the outside throughthe gas inlet to extend into the cavity is arranged in the valve seat; the side wall of the gas inlet channel is a smooth curved surface; the gas inlet is equipped with a gas inlet flange; the two sides of the gas inlet flange are separately equipped with connecting holes; and the end surfaces of the connecting holes in the two sides and the flange surface define an included angle greater than zero. The valve seat structure is further provided with a motor mounting part, and a cooling water path is further arranged in the valve seat. The valve seat structure effectively solves the problems that the gas inlet in the prior art easily leaks gas, gas flow of gas inlets and gas outlets of the double valves is not smooth, motor mounting is unstable, the valve is cooled badly, valve seat assemblyquality and efficiency is low, and the like.

Description

technical field [0001] The invention relates to the technical field of engine exhaust gas recirculation, in particular to a double-spool hot-end EGR valve. Background technique [0002] The full name of EGR is Exhaust Gas Recirculation, that is, the exhaust gas recirculation system. It guides part of the exhaust gas in the engine exhaust back to the intake pipe through the pipeline, merges with the gas in the intake pipe, and then enters the cylinder for recirculation, which can effectively reduce exhaust gas. Nitric oxide (NO X ) of discharge. As automobile exhaust emission regulations become more and more stringent, the role of EGR on the engine is becoming more and more obvious. As a key actuator in the engine exhaust gas recirculation system (EGR system), the EGR valve plays a role in regulating the flow of recirculated exhaust gas. Its specific role is to introduce a small amount of exhaust gas into the cylinder, reduce the temperature in the cylinder and reduce the e...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to design a valve seat structure for the EGR valve at the hot end of the double valve core, to solve the problems of poor airflow and poor sealing of the EGR valve in the prior art, and to make the assembly of the EGR valve more convenient , improve the service life of the EGR valve

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