Diaphragm pump

Abstract

A diaphragm pump comprising a pressure chamber arranged such that the volume of the pressure chamber is expanded and contracted by oscillation of a diaphragm ( 5 ), a suction-side check valve ( 7 ) for sucking air into the pressure chamber and a discharge-side check valve ( 8 ) for discharging air from the pressure chamber. The suction-side check valve is arranged to close by a valve body ( 17 ) being elastically deformed and brought into close contact with a valve seat, and open by the valve body elastically returning to the normal shape and coming out of contact with the valve seat. The discharge-side check valve is arranged to open by a valve body ( 18 ) being elastically deformed and producing a space relative to a valve seat, and close by the valve body elastically returning to the normal shape and coming into close contact with the valve seat.

1 . A diaphragm pump, comprising: 
 a diaphragm driven to move back and forth;    a pressure chamber having the diaphragm as a wall so that the oscillation of the diaphragm expands and contracts the volume of the pressure chamber, the pressure chamber having another wall provided with an suction port and a discharge port;    a suction-side check valve fitted to the suction port and arranged to open and suck a fluid into the pressure chamber when the volume of the pressure chamber is expanded, and close when the volume of the pressure chamber is contracted, the suction-side check valve including a valve seat provided near the suction port and a valve body of an elastic material fitted to the valve seat with a space between, and being arranged to close by the valve body being elastically deformed and brought into close contact with the valve seat, and open by the valve body elastically returning to the normal shape and coming out of contact with the valve seat, and    a discharge-side check valve fitted to the discharge port and arranged to open and discharge the fluid from the pressure chamber when the volume of the pressure chamber is contracted, and close when the volume of the pressure chamber is expanded, the discharge-side check valve including a valve seat provided near the discharge port and a valve body of an elastic material fitted to the valve seat in close contact with the valve seat, and being arranged to open by the valve body being elastically deformed and producing a space relative to the valve seat, and close by the valve body elastically returning to the normal shape and coming into close contact with the valve seat.    
   
   
       2 . The diaphragm pump according to  claim 1 , wherein 
 the diaphragm is connected to an oscillator driven by an electromagnet to move back and forth.    
   
   
       3 . The diaphragm pump according to  claim 1 , wherein 
 the diaphragm is provided at each end of a rod-like oscillator driven by an electromagnet to move back and forth in the axial direction, and the pressure chamber is a pair of pressure chambers each including one of the diaphragms, where the volumes of the paired pressure chambers are expanded and contracted in a complementary manner.