Tube assembly, compressor, refrigeration apparatus, and method of manufacturing tube assembly

A method of manufacturing a tube assembly comprising:

• placing an inner tube that includes an outer peripheral surface first portion and an outer peripheral surface second portion and constitutes an injection path of a compressor such that the outer peripheral surface first portion is located below the outer peripheral surface second portion, the outer peripheral surface second portion being located inward compared with the outer peripheral surface first portion;
• preparing an outer tube that includes an inner peripheral surface first portion and an inner peripheral surface second portion and constitutes the injection path, the inner peripheral surface first portion and the inner peripheral surface second portion having a same inner diameter, the inner peripheral surface first portion being located at a side of an end of the outer tube, the inner peripheral surface second portion being located farther from the end than the inner peripheral surface first portion is;
• press-fitting the outer peripheral surface first portion into the inner peripheral surface first portion such that the outer peripheral surface second portion and the inner peripheral surface second portion form a brazing gap;
• arranging a brazing material before the press-fitting or after the press-fitting such that the brazing material is located in the brazing gap;
• and
• brazing the inner tube, the outer tube, and the brazing material in a furnace such that the brazing material melted by the brazing fixes the outer peripheral surface second portion and the inner peripheral surface second portion.

A tube assembly comprising:

• an inner tube having an outer peripheral surface first portion and an outer peripheral surface second portion, the inner tube forming a refrigerant passage of a compressor;
• an outer tube having an inner peripheral surface first portion and an inner peripheral surface second portion, the outer tube forming the refrigerant passage, the inner peripheral surface first portion being located adjacent to an end of the outer tube, the inner peripheral surface second portion being located spaced from the end as compared with the inner peripheral surface first portion, and an entirety of a circumference of the outer peripheral surface first portion being press-fitted into the inner peripheral surface first portion;
• and
• a brazing material disposed in a brazing gap between the outer peripheral surface second portion and the inner peripheral surface second portion, the brazing material fixing the outer peripheral surface second portion and the inner peripheral surface second portion.