EXHAUST GAS INLET STRUCTURE OF AN EXHAUST GAS RECIRCULATION COOLER

摘要

The present invention discloses an exhaust gas inlet structure of an exhaust gas recirculation (EGR) Cooler which includes a water shell, a gas inlet pipe, a bellow, an insulated pipe, an inlet chamber, a pre-cooling water chamber and a main board. The water shell is equipped with a water inlet pipe. Its main feature is the insulated pipe is placed within the bellow and connected with the gas inlet pipe at one end while the other end is suspended. The large-bore end of the inlet chamber is connected with the main board to form a gas inlet cavity while leaving a space to form a coolant channel between the joining part and the water shell. An external surface of a middle pipe body connects to the bellow to form a pre-cooling cavity connected to the coolant channel. The advantages of the present invention are as follow: newly-added pre-cooling water chamber reduces the wall temperature of the main board and the inlet chamber; newly-added supporting in the middle part of the insulated pipe improves the vibration-proof function of the insulated pipe; the special structure of the inlet chamber increases the ability of the axial displacement compensation. The above-mentioned improvement of the present invention significantly improves the reliability of the EGR cooler.

主权项

1. An exhaust gas inlet structure of an exhaust gas recirculation (EGR) cooler comprising a water shell, a gas inlet pipe, a bellow, an insulated pipe, an inlet chamber, a pre-cooling water chamber and a main board, the water shell is equipped with a water inlet pipe, characterized in that the gas inlet pipe, the bellow, the pre-cooling water chamber and the water shell are connected in sequence; the insulated pipe is placed within the bellow and connected with the gas inlet pipe at one end while the other end is suspended; the inlet chamber is a two-grade reducing pipe including a large-bore end, a middle pipe body and a small-bore end, the large-bore end is connected with the main board to form a gas inlet cavity while leaving a space to form a coolant channel between the jointing part and the water shell; an external surface of the middle pipe body connects to the bellow and/or an end of pre-cooling water chamber to form a pre-cooling cavity connected to a coolant channel; the small-bore end contacts an external surface of a middle part of the insulated pipe.