SMALL PUMP DEVICE AND SPHYGMOMANOMETER USING THE PUMP DEVICE

摘要

A small pump device, comprising a motor which constitutes the small pump device, a case body installed on the output shaft surface of the motor, a rotating cylindrical body which is assembled onto the output shaft of the motor and performs the rotating motion according to the rotation of the motor, an air chamber formed of a soft elastic body, a driving body which compresses and expands the air chamber, an inner case having an intake hole and a discharge hole, intake and discharge valves for counterflow prevention, and a case cover having intake and discharge holes, wherein a spiral guide part engaged with a part of the driving body is provided on the outer surface of the rotating cylindrical body so that the driving body can be displaced at a specified pitch in response to the rotation of the rotating cylindrical body, whereby the rotating motion of the motor can be converted efficiently to a linear motion which compresses and expands the air chamber.