Heat exchanger, and internal combustion engine blow-by gas processing device

A heat exchanger, comprising:

• an inner pipe;
• a first flow path which is formed inside the inner pipe and through which a first fluid flows;
• an outer pipe which is coaxially arranged on an outer side of the inner pipe in a radial direction;
• a second flow path which is formed between the inner pipe and the outer pipe and through which a second fluid flows;
• a partition wall which has an annular shape and which divides the second flow path into a plurality of spaces in an axial direction of the outer pipe;
• and
• a space outlet which is formed at one location, in a circumferential direction, of the partition wall and which allows the second fluid to flow from the space on an upstream side to the space on a downstream side,
• wherein the space is configured to swirl the second fluid around a second axis orthogonal to a first axis located at a center of the outer pipe,
• wherein the heat exchanger is included in a blow-by gas processing device for an internal combustion engine,
• wherein the internal combustion engine includes:
• an intake passage;
• a compressor of a turbocharger which is installed in the intake passage;
• and
• a refrigerant passage through which refrigerant, as a first fluid, flows,
• wherein the blow-by gas processing device further includes:
• a blow-by gas passage through which blow-by gas flows;
• an oil separator which is provided in the blow-by gas passage and which separates oil from blow-by gas by using compressed air, as a second fluid, generated by the compressor;
• and
• an air passage which takes out compressed air from the intake passage further on the downstream side than the compressor and which introduces the compressed air into the oil separator,
• wherein refrigerant is introduced into a first flow path of the heat exchanger from the refrigerant passage, and
• wherein a second flow path of the heat exchanger forms a part of the air passage.