Electromagnetic-type pump

Abstract

An electromagnetically driven diaphragm pump ( 100 ) includes a diaphragm ( 142 ), a first center disk ( 150 ) and a second center disk ( 160 ), and an oscillator ( 130 ). The first center disk ( 150 ) has a circular-ring shaped first disk contact surface ( 151 a ) that is disposed opposing an outer surface ( 144 ) of the diaphragm ( 142 ) and that makes contact with the outer surface ( 144 ) when the oscillator ( 130 ) is in the neutral position. The second center disk ( 160 ) has a circular-ring shaped second disk contact surface ( 161 a ) that is disposed opposing an inner surface ( 145 ) of the diaphragm ( 142 ), and makes contact with the inner surface ( 145 ) when the oscillator ( 130 ) is in the neutral position. The second center disk ( 160 ) has an outer diameter (D 2 b ) set in the range of 1.05-1.30 times an outer diameter (D 1 b) of the first disk contact surface ( 151 a ).

1 . A pump comprising:
 a discoidal diaphragm composed of an elastic material;   a first center disk and a second center disk that are both discoidal and concentric with the diaphragm, the first center disk being fixed with respect to the second center disk such that a central area of the diaphragm is interposed between the first center disk and the second center disk;   an oscillator coupled to at least one of the first center disk and the second center disk and configured to reciprocally oscillates the diaphragm in an intake direction and a discharge direction about a neutral position; and   a valve case disposed on a side of the oscillator that is opposite of the diaphragm, the valve case having a compression chamber for sucking in a fluid during movement in the intake direction of the oscillator and for compressing that fluid during movement in the discharge direction of the oscillator;   
       wherein:
 the first center disk has a circular-ring shaped first disk contact surface that is disposed opposing an outer surface of the diaphragm that (i) faces towards the compression chamber of the valve case, (ii) makes contact with the outer surface when the oscillator is in the neutral position and (iii) has an outer diameter; 
 the second center disk has a circular-ring shaped second disk contact surface that (i) is disposed opposing an inner surface of the diaphragm that faces towards the oscillator, (ii) makes contact with the inner surface when the oscillator is in the neutral position, and (iii) has an outer diameter set in the range of 1.05-1.30 times the outer diameter of the first disk contact surface; and 
 the diaphragm, the first center disk and the second center disk are configured such that, during reciprocating oscillation in the intake direction and the discharge direction of the oscillator, the diaphragm centrally bends at a contact part within the outer surface of the diaphragm, with respect to an outer circumference of the first disk contact surface of the first center disk, and centrally bends at a contact part within the inner surface of the diaphragm, with respect to an outer circumference of the second disk contact surface of the second center disk. 
 
     
     
         2 . The pump according to  claim 1 , wherein:
 the first center disk has a first disk curved surface that extends from the outer circumference of the first disk contact surface while curving outward in a radial direction of the first center disk with a radius of curvature, the first disk curved surface having a ring shape in a circumferential direction of the first center disk; and   the second center disk has a second disk curved surface that extends from the outer circumference of the second disk contact surface while curving outward in a radial direction of the second center disk with the same radius of curvature as that of the first disk curved surface, the second disk curved surface having a ring shape in a circumferential direction of the second center disk.   
     
     
         3 . A pump comprising:
 an elastic diaphragm;   a first center disk,   a second center disk fixed with respect to the first center disk such that a central area of the diaphragm is interposed between the first center disk and the second center disk;   an electromagnetic oscillator coupled to at least one of the first center disk and the second center disk and configured to reciprocally oscillate the diaphragm about a neutral position; and   a valve case disposed such that the diaphragm is interposed between the electromagnetic oscillator and the valve case, the valve case having a compression chamber configured to intake a fluid when the electromagnetic oscillator moves in an intake direction and to compress the fluid when the electromagnetic oscillator moves in a discharge direction;   
       wherein:
 the first center disk has a first circumference with a first diameter and the second center disk has a second circumference with a second diameter, 
 the first circumference is a radially outermost portion of the first center disk that makes contact with the diaphragm when the diaphragm is located in the neutral position, 
 the second circumference is a radially outermost portion of the second center disk that makes contact with the diaphragm when the diaphragm is located in the neutral position, 
 the second diameter is between 1.05 and 1.30 times greater than the first diameter. 
 
     
     
         4 . The pump according to  claim 3 , wherein the diaphragm, the first center disk and the second center disk are configured such that:
 the diaphragm bends along a first circle adjacent the first circumference of the first center disk when the diaphragm moves in the intake direction,   the diaphragm bends along a second circle adjacent the second circumference of the second center disk when the diaphragm moves in the discharge direction, the second circle being larger than the first circle.   
     
     
         5 . The pump according to  claim 4 , wherein the first center disk is disposed between the diaphragm and the valve case and the second center disk is disposed between the diaphragm and the electromagnetic oscillator. 
     
     
         6 . The pump according to  claim 5 , wherein:
 the first center disk has a third circumference with a third diameter and the second center disk has a fourth circumference with a fourth diameter,   the third circumference is a radially outermost edge of the first center disk,   the fourth circumference is a radially outermost edge of the second center disk,   the first center disk curves away from the diaphragm between the first circumference and the third circumference, and   the second center disk curves away from the diaphragm between the second circumference and the fourth circumference.   
     
     
         7 . The pump according to  claim 6 , wherein:
 the first center disk curves away from the diaphragm between the first circumference and the third circumference with a first radius of curvature, and   the second center disk curves away from the diaphragm between the second circumference and the fourth circumference with a second radius of curvature.   
     
     
         8 . The pump according to  claim 7 , wherein the elastic diaphragm is composed of a rubber material. 
     
     
         9 . The pump according to  claim 8 , wherein the second circle has a diameter that is between 1.05 and 1.30 times greater than the diameter of the first circle. 
     
     
         10 . The pump according to  claim 4 , wherein the second circle has a diameter that is between 1.05 and 1.30 times greater than the diameter of the first circle. 
     
     
         11 . The pump according to  claim 3 , wherein the first center disk is disposed between the diaphragm and the valve case and the second center disk is disposed between the diaphragm and the electromagnetic oscillator. 
     
     
         12 . The pump according to  claim 3 , wherein:
 the first center disk has a third circumference with a third diameter and the second center disk has a fourth circumference with a fourth diameter,   the third circumference is a radially outermost edge of the first center disk,   the fourth circumference is a radially outermost edge of the second center disk,   the first center disk curves away from the diaphragm between the first circumference and the third circumference, and   the second center disk curves away from the diaphragm between the second circumference and the fourth circumference.   
     
     
         13 . The pump according to  claim 12 , wherein:
 the first center disk curves away from the diaphragm between the first circumference and the third circumference with a first radius of curvature, and   the second center disk curves away from the diaphragm between the second circumference and the fourth circumference with a second radius of curvature.   
     
     
         14 . The pump according to  claim 13 , wherein the first radius of curvature is equal to the second radius of curvature.