Heat exchanger, and exhaust heat recovery apparatus having the heat exchanger

An exhaust heat recovery apparatus comprising:

• a main exhaust passage into which is introduced exhaust gas from an internal combustion engine;
• a bypass passage branched off from a part of the main exhaust passage to provide a gas inlet port, and merged into another part of the main exhaust passage to provide a gas outlet port;
• a heat exchanger for heat exchanging with the exhaust gas passing through the bypass passage to recover exhaust heat, wherein the heat exchanger comprises:
• a plurality of heat exchange segments juxtaposed in a housing that possesses an inner surface, the plurality of heat exchange segments being spaced apart from one another and from the inner surface of the housing;
• and
• a plug member connected fluid-tightly to the housing, the plug member supporting the plurality of heat exchange segments to provide cooling medium passages in each gap between the heat exchange segments adjacent to each other, and between the heat exchange segments and the inner surface of the housing;
• each heat exchange segment configuring the plurality of heat exchange segments, comprising;
• a case having an opening on only one surface of the case, at least outside of the opening being plugged fluid-tightly by the plug member,
• a guide member accommodated in the case, the guide member having a plurality of passages allowing gas flow in only a predetermined direction, and gas intake passages and gas exhaust passages at upstream and downstream of the plurality of passages of the guide member, and
• the opening of the case of each segment being provided with a gas inlet port communicated with the gas intake passages to configure the gas inlet port of the bypass passage, and a gas outlet port communicated with the gas exhaust passages to configure the gas outlet port of the bypass passage.