Exhaust heat exchanger

摘要

An exhaust heat exchanger includes a water tank accommodating tubes and having an outside space defined outside of the tubes, a gas tank having an exhaust passage and an outside space defined outside of the exhaust passage, a dividing portion to separate the outside space of the water tank from the exhaust passage of the gas tank, and a communication portion. The outside space of the gas tank and the outside space of the water tank communicate with each other through the communication portion.

主权项

1. An exhaust heat exchanger comprising:
a tube through which gas exhausted from an engine passes; a water tank to accommodate the tube, the water tank having an outside space located outside of the tube, heat being exchanged between cooling fluid passing through the outside space of the water tank and the exhaust gas passing through the tube; a flange to which an exhaust pipe of the engine is to be connected; a gas tank having dual structure constructed by
an exhaust passage through which the exhaust gas passes, the exhaust passage having a first opening part connected to an open end portion of the water tank, and a second opening part to which the flange is fixed, andan outside space located outside of the exhaust passage; a dividing portion to separate the outside space of the water tank from the exhaust passage of the gas tank, the exhaust passage communicating with an inside of the tube through the dividing portion; and a communication portion through which the outside space of the gas tank and the outside space of the water tank communicate with each other; wherein the open end portion of the water tank has a water tank expansion expanded outward, the gas tank has an outer wall defining a part of the outside space of the gas tank, the outer wall being located adjacent to the first opening part, the outer wall has a gas tank expansion expanded outward, the gas tank expansion communicating with the outside space of the water tank, and the communication portion is defined by the water tank expansion and the gas tank expansion connected with each other.