Pump and air supply device

A pump, comprising:

• a vibration actuator which can be electromagnetically driven;
• and
• a pump unit for suctioning and discharging fluid due to electromagnetic drive of the vibration actuator,
• wherein the vibration actuator includes:
• a fixed body on which the pump unit is provided, the fixed body containing one of a coil core portion having a coil and a core portion around which the coil is wound and a magnet disposed so as to face an end portion of the core portion,
• a movable body elastically held by magnetic attraction force of the magnet, the movable body containing another one of the coil core portion and the magnet, and
• a shaft portion for supporting the movable body so that the movable body can perform reciprocating rotation,
• wherein the pump unit includes:
• a movable wall which can be moved by rotational movement of the movable body, and
• a sealed chamber which is communicated with a discharge port for the fluid and a suction port for the fluid and whose volume can be changed by displacement of the movable wall,
• wherein the movable body has:
• a pressing portion which can be moved in an arc track around the shaft portion and abut against the movable wall to press the movable wall when the movable body performs the reciprocating rotation, and
• an arm portion extending in a direction perpendicular to an axial direction of the shaft portion from a portion axially supported by the shaft portion,
• wherein the arm portion has:
• a round hole passing through the arm portion in the axial direction of the shaft portion, and
• a long hole passing through the arm portion in the axial direction of the shaft portion and elongated in the direction perpendicular to the axial direction of the shaft portion,
• wherein the pressing portion has:
• a shaft protrusion axially attached to the round hole of the arm portion, and
• a guide protrusion loosely fitted in the long hole of the arm portion,
• wherein the pressing portion linearly presses the movable wall when the movable body performs the reciprocating rotation, and
• wherein the movable wall is disposed in a moving direction of the pressing portion and displaced when the movable wall is linearly pressed by the pressing portion to discharge the fluid in the sealed chamber through the discharge port.