Magnetic suspension pumps

Abstract

A magnetically suspended piston pump comprises a cylinder made of cylindrical permanent magnet, a piston made of circular permanent magnet, and a circular magnetic plate located at an end of the cylinder, in which an outer surface of the piston has an identical magnetic polarity with an inner surface of the cylinder, and a surface of the circular magnetic plate towards an inside portion of the cylinder has an identical magnetic polarity with a surface of the piston facing to the circular magnetic plate.

1 . A magnetically suspended piston pump, which comprises 
 a cylinder made of permanent magnet;    a piston made of permanent magnet, the piston being provided within the cylinder and driven by a driving mechanism; and    an inlet valve and an outlet valve disposed at the cylinder,    wherein an outer surface of the piston has an identical magnetic polarity with an inner surface of the cylinder, a circular magnetic plate is provided at an end of the cylinder, and a surface of the circular magnetic plate facing to an inside portion of the cylinder has an identical magnetic polarity with a surface of the piston facing to the circular magnetic plate.    
   
   
       2 . The piston pump according to  claim 1 , wherein the circular magnetic plate is disposed within the cylinder, and is made of permanent magnet or electromagnet.  
   
   
       3 . (canceled)  
   
   
       4 . The piston pump according to  claim 1 , wherein the driving mechanism comprises two electromagnets provided at both ends of the cylinder, respectively, and an electronic circuit controlling the two electromagnets to generate an alternating magnetic field around them, which thereby drives the piston to move.  
   
   
       5 . (canceled)  
   
   
       6 . The piston pump according to  claim 4 , wherein the electronic circuit comprises a common-mode rejection circuit, a microprocessor control circuit, and a power amplification circuit, wherein a signal for indicating a variation of the magnetic field is transmitted to the microprocessor control circuit through the common-mode rejection circuit, the microprocessor control circuit generates a response to the signal for driving the power amplification circuit, and then an output signal of the power amplification circuit is transmitted to the electromagnets.  
   
   
       7 . The piston pump according to  claim 6 , wherein the signal is generated by two magnetic sensors provided at both ends of the cylinder.  
   
   
       8 . The piston pump according to  claim 6 , wherein the signal is generated by the two electromagnets.  
   
   
       9 . The piston pump according to  claim 1 , wherein the driving mechanism comprises a connecting rod connected to the piston.  
   
   
       10 . The piston pump according to  claim 1 , wherein the cylinder is configured to generate a uniform magnetic field so that the intensity of the magnetic field is identical at each of 360 degrees to the inner surface of the cylinder.  
   
   
       11 . The piston pump according to  claim 1 , wherein two fixed circular magnetic plates are respectively provided at both ends of the cylinder, the fixed circular magnetic plates are configured to have the same magnetic polarity as surfaces of the piston facing to them, respectively.  
   
   
       12 . A magnetically suspended piston pump, which comprises: 
 an upper cylinder and a lower cylinder made of permanent magnet, each having an inlet valve and an outlet valve;    an upper piston and a lower piston made of permanent magnet and provided within the upper cylinder and the lower cylinder, respectively; and    a driving mechanism connected to the upper piston and the lower piston, 
 wherein an outer surface of the upper piston has an identical magnetic polarity with an inner surface of the upper cylinder and an outer surface of the lower piston has an identical magnetic polarity with an inner surface of the lower cylinder;  
 an upper circular magnetic plate is provided at a bottom portion of the upper cylinder and a lower circular magnetic plate is provided at a top portion of the lower cylinder; and  
 a surface of the upper circular magnetic plate facing to an inside portion of the upper cylinder has an identical magnetic polarity with a surface of the piston facing to the upper circular magnetic plate and a surface of the lower circular magnetic plate facing to an inside portion of the lower cylinder has an identical magnetic polarity with a surface of the piston facing to the lower circular magnetic plate.  
   
   
   
       13 . The piston pump according to  claim 12 , wherein each of the two cylinders is configured to generate a uniform magnetic field so that the intensity of the magnetic field is identical at each of 360 degrees to the inner surface of the cylinder.  
   
   
       14 . The piston pump according to  claim 12 , wherein each of the two circular magnetic plates is made of permanent magnet or electromagnet.  
   
   
       15 . The piston pump according to  claim 12 , wherein the driving mechanism comprises a connecting rob connected between the upper piston and the lower piston, two circular permanent magnets provided at the connecting rob, a pair of electromagnets respectively provided at two sides of the circular permanent magnets forming an angle of 180 degrees from each other, and two groups of coils respectively disposed in the electromagnets and connected in series with each other.