Flow path structure

A flow path structure for a medium circulation device in which a medium circulates, the flow path structure comprising:

• a flow path tube including a flow path tube space through which the medium flows;
• at least one connection portion including a connection portion space in which the medium flows, at least a portion of the at least one connection portion being located in the flow path tube space;
• and
• a clamp portion located on an outer peripheral surface of the flow path tube;
• wherein
• a thermal expansion coefficient of the flow path tube is different from a thermal expansion coefficient of the at least one connection portion;
• the clamp portion includes:
• a band portion surrounding the outer peripheral surface of the flow path tube at a position where the flow path tube and the at least one connection portion overlap each other in a radial direction;
• and
• an acting portion that changes size of an inner diameter of the band portion in accordance with a change in size of at least one of an outer diameter of the flow path tube, an inner diameter of the flow path tube, and an outer diameter of the at least one connection portion;
• the flow path tube includes:
• an inflow path tube through which the medium flows into the medium circulation device;
• and
• an outflow path tube through which the medium flows out of the medium circulation device;
• at least a portion of the inflow path tube and at least a portion of the outflow path tube overlap each other when viewed along a first direction extending away from the medium circulation device;
• the at least one connection portion includes:
• a first connection portion;
• and
• a second connection portion different from the first connection portion;
• the inflow path tube further includes a first portion in which one end side of the flow path tube overlaps the first connection portion, a second portion in which another end side of the flow path tube overlaps the second connection portion, and a folded portion connecting the first portion and the second portion;
• the folded portion is located on a same side of both of the first connection portion and the second connection portion in a second direction which intersects the first direction;
• and
• the outflow path tube is located at a side of the inflow path tube in the first direction.