Patent ID: 8480383

Claim:
A solenoid pump comprising: a housing formed therein with a fluid passage through which a fluid flows from an inlet port to an outlet port; a movable member, which is displaced based on an excitation state of a solenoid section, for thereby opening and closing the fluid passage; and a diaphragm provided on an end portion of the movable member, the diaphragm being formed with an abutment that confronts a portion of the housing during a blocked condition of the fluid passage, wherein the fluid passage includes an inlet side passage that communicates with the inlet port, an outlet side passage that communicates with the outlet port, and a pump chamber made up of a space in communication with the inlet side passage and the outlet side passage, and surrounded by the housing and the end portion of the movable member, and wherein the movable member, accompanying displacement thereof, opens and closes communication between the pump chamber and the outlet side passage, wherein an opening of the outlet side passage is formed in a tapered shape expanding in diameter toward the movable member, wherein the diaphragm is formed with a projection, the projection engaging with the tapered shape of the opening of the outlet side passage by inserting therein, thereby sealing the opening of the outlet side passage, wherein the housing is formed by a fixed wall that surrounds the opening of the outlet side passage in communication with the pump chamber, wherein the diaphragm abutment confronts the fixed wall, and an outer peripheral edge portion of the diaphragm being fixed to the housing, and the abutment is placed in intimate contact with the fixed wall during a blocked condition of the fluid passage.