Nozzle

A nozzle adapted to eject liquid, comprising:

• a main body;
• a buffer chamber provided in the main body, whose central axis is an axis line serving as a center line of a jet stream of a liquid, which has an internal space whose outer shape is of a cylinder, and which cylinder has a front end plane surface and a rear end surface;
• a constrictor part adapted to eject the liquid, provided on the front end plane surface of the buffer chamber in a direction of the axis line and whose central axis is the axis line;
• a disk having a front plane surface and a back surface and provided inside the buffer chamber, the front plane surface of the disk facing the front end plane surface of the buffer chamber and whose central axis is the axis line, there being a gap between the front plane surface of the disk and the front end plane surface of the buffer chamber, the disk having a diameter smaller than the diameter of the buffer chamber, and which disk has a groove provided on the front plane surface thereof;
• a supporting member adapted to support the disk within the buffer chamber, the supporting member having a shaft provided on the back surface of the disk, the shaft being of a cylindrical shape whose central axis is the axis line;
• a supply opening provided in the main body, adapted to supply the liquid;
• and
• an inflow channel provided along a direction different from an extending direction of the axis line, and connected to the buffer chamber at a location between the back surface of the disk and the rear end surface of the buffer chamber, the inflow channel communicating with the supply opening, wherein
• the groove has an internal space whose outer shape is of a cylinder whose central axis is the axis line, or of a truncated cone shape whose section broadens as the internal space approaches the one side, and
• the disk partitions the buffer chamber into a storage chamber rear of the disk, a disk-shaped rectification space front of the disk, and an annular-shaped communication passage, the storage chamber communicating to the inflow channel, the communication passage being space between a circumferential surface of the disk and an inner circumferential surface of the buffer chamber.