Electromagnetic pump

Abstract

An electromagnetic pump including a piston that reciprocates inside a cylinder; an electromagnetic portion and a biasing member that respectively forwardly and backwardly move the piston; a support for the biasing member that defines a chamber with the cylinder and the piston; a valve incorporated into the support member that allows fluid to move from an intake port to the chamber and prohibits reverse flow; and a valve that allows the fluid to move from the chamber to a discharge port and prohibits reverse flow. The support member includes a bottomed hollow portion accommodating at least a portion of the intake on-off valve, and a hole providing communication between a bottom portion of the hollow portion on the chamber side and the chamber. The support member includes a portion that supports the biasing member, and a portion that communicates with the hole and projects from the support toward the piston.

1 . An electromagnetic pump comprising:
 a cylinder;   a piston that can reciprocate inside the cylinder;   an electromagnetic portion that forwardly moves the piston;   a biasing member that backwardly moves the piston;   a support member that supports the biasing member and, with the cylinder and the piston, defines a pump chamber;   an intake on-off valve that is incorporated into the support member, and allows a hydraulic fluid to move from an intake port to the pump chamber and prohibits reverse movement of the hydraulic fluid; and   a discharge on-off valve that allows the hydraulic fluid to move from the pump chamber to a discharge port and prohibits reverse movement of the hydraulic fluid, wherein   the support member includes therein a bottomed hollow portion accommodating from the intake port side at least a portion of the intake on-off valve, and a communication hole providing communication between a bottom portion of the hollow portion on the pump chamber side and the pump chamber, and   the support member is formed with a support portion that supports the biasing member, and a projection portion that is in communication with the communication hole and projects from the support portion toward the piston side.   
     
     
         2 . The electromagnetic pump according to  claim 1 , wherein a diameter of the projection portion on the piston side is formed smaller than a diameter of the projection portion on the support portion side. 
     
     
         3 . The electromagnetic pump according to  claim 2 , wherein the projection portion is formed into a truncated conical shape. 
     
     
         4 . The electromagnetic pump according to  claim 1 , wherein the hydraulic fluid is discharged by the biasing member backwardly moving the piston. 
     
     
         5 . The electromagnetic pump according to  claim 1 , wherein the hollow portion of the support member is formed such that the bottom portion is more toward the piston side than a support surface of the support portion.