Internal heat exchanger and refrigeration cycle apparatus including internal heat exchanger

摘要

PROBLEM TO BE SOLVED: To reduce a refrigerant pipe branched from a double pipe and to fix the double pipe directly to a connector. An inner flow path (18b) through which a refrigerant on the low pressure side of a refrigeration cycle (11) flows is formed inside a double tube inner tube (182), and a high pressure side of the refrigeration cycle (11) is formed between an outer tube (181) and an inner tube (182). An internal/external flow path 18a through which the refrigerant flows is formed. In addition, the inner passage 18b and the inner-outer passage 18a communicate with the refrigerant passages of the connection target members by interposing between the tip ends of the outer pipe 181 and the inner pipe 182 and the connection target members 14, 35, 37. The expansion valve side connector 186 and the anti-expansion valve side connector 31 are provided. The outer diameter of the outer tube is 30 mm or less, and the ratio of the difference between the inner diameter of the outer tube and the outer diameter of the inner tube to the inner diameter of the outer tube is 25% or less. The outer pipe 181 and the inner pipe 182 are provided with seal members 191, 192 for preventing the leakage of the refrigerant, and the outer pipe 181 and the inner pipe 182 are mechanically fixed to the expansion valve side connector 186 and the anti-expansion valve side connector 31. .. [Selection diagram] Fig. 15