Pump device with turning prevention protruded part to prevent turning of a first case relative to a second case

摘要

A pump device may include a first case provided with a circular ring-shaped protruded part, a second case provided with a circular ring-shaped stepped part into which the circular ring-shaped protruded part is coaxially inserted, an O-ring which is mounted on a circular outer peripheral face of the circular ring-shaped protruded part and is crushed between the circular outer peripheral face of the circular ring-shaped protruded part and a circular inner peripheral face of the circular ring-shaped stepped part in a direction perpendicular to an axial line of the circular ring-shaped protruded part, and a turning prevention mechanism which prevents the first case and the second case from being relatively turned to each other around the axial line when the circular ring-shaped protruded part of the first case is inserted into the circular ring-shaped stepped part of the second case to form the pump chamber.

主权项

1. A pump device comprising:
a first case provided with a circular ring-shaped protruded part; a second case which is provided with a circular ring-shaped stepped part into which the circular ring-shaped protruded part is coaxially inserted and which partitions a pump chamber on an inner peripheral side of the circular ring-shaped stepped part together with the first case; an O-ring which is mounted on a circular outer peripheral face of the circular ring-shaped protruded part and is crushed between the circular outer peripheral face of the circular ring-shaped protruded part and a circular inner peripheral face of the circular ring-shaped stepped part in a direction perpendicular to an axial line of the circular ring-shaped protruded part; a turning preventing protruded part which is provided in the first case and is extended to the second case; and a recessed part which is provided in the second case so that the turning preventing protruded part fits into the recessed part in an axial direction; wherein the turning preventing protruded part is located at a position separated to an outer side from the circular ring-shaped protruded part and the recessed part is at a position separated to an outer side from the circular ring-shaped stepped part so as to be abutted with the turning preventing protruded part in a circumferential direction; and wherein, when the turning preventing protruded part engages the recessed part, an axial distance between a tip end part of the turning preventing protruded part to an upper end face of the second case is greater than or equal to an axial distance between the upper end face of the of the second case to a circular ring-shaped end face of the of the circular ring-shaped stepped part.