Flow rate adjusting device

A flow rate adjusting device comprising:

• a first member having a valve portion, the valve portion being formed in a circularly columnar shape so as to extend along a first axis;
• and
• a second member having an accommodation hole, the accommodation hole being formed so as to extend along the first axis and having a circular cross section orthogonal to the first axis,
• wherein the first member is accommodated in the second member rotatably about the first axis with an outer circumferential face of the valve portion and an inner circumferential face of the accommodation hole being in contact with each other,
• wherein the second member has an outflow channel, the outflow channel being formed so as to extend along a second axis orthogonal to the first axis and configured to guide a fluid from the inner circumferential face of the accommodation hole to an outflow pipe connected to the second member,
• wherein the valve portion has
• an inflow hole into which a fluid flows,
• an outflow hole configured to allow a fluid flowing in from the inflow hole to flow out along a third axis orthogonal to the first axis, and
• at least one outflow groove formed in the outer circumferential face in a circumferential direction about the first axis from one end connected to the outflow hole,
• wherein the outflow groove forms a flow rate adjusting channel extending in the circumferential direction from the one end to the other end between the outflow groove and the inner circumferential face of the accommodation hole and connecting the outflow hole and the outflow channel to each other, and
• wherein the sectional area of the flow rate adjusting channel gradually decreases in accordance with a distance in the circumferential direction from the one end of the outflow groove.