Pump device

Abstract

A pump device may include an eccentric member mounted on an output shaft in an eccentric manner, a cam mechanism which is engaged with the eccentric member to convert a motion of the output shaft into a radial direction and at least one pump body which includes a diaphragm that is moved in the radial direction in relation to the output shaft by the cam mechanism for performing a pumping operation.

1 . A pump device comprising: 
 a motor;    an eccentric member which is mounted on an output shaft of the motor in an eccentric manner;    a cam mechanism which is engaged with the eccentric member to convert a motion of the output shaft into a radial direction; and    at least one pump body, which includes a diaphragm that is moved in the radial direction in relation to the output shaft by the cam mechanism for performing a pumping operation.    
   
   
       2 . The pump device according to  claim 1 , wherein the motor is a stepping motor.  
   
   
       3 . The pump device according to  claim 1 , wherein the cam mechanism includes a contact ring which is rotatably mounted with respect to the eccentric member and, when the eccentric member is rotated, the contact ring makes the diaphragm move in the radial direction relative to the output shaft while the contact ring relatively rotates with respect to the eccentric member.  
   
   
       4 . The pump device according to  claim 1 , further comprising: 
 a pressure chamber which is closed by the diaphragm and is in communication with an inflow passage and an outflow passage; and    a projecting part for moving the diaphragm which is formed on an opposite side to the pressure chamber with respect to the diaphragm,    wherein, when the pressure of the pressure chamber increases with the diaphragm being pushed by the contact ring through the projecting part, fluid flows out from the pressure chamber and, when the diaphragm returns, the pressure of the pressure chamber decreases to make fluid flow into the pressure chamber.    
   
   
       5 . The pump device according to  claim 4 , wherein a fluorine coating is applied to the projecting part of the diaphragm.  
   
   
       6 . The pump device according to  claim 4 , wherein the projecting part of the diaphragm is covered with material having an abrasion resistance property and a low friction coefficient.  
   
   
       7 . The pump device according to  claim 3 , wherein the plurality of pump bodies are four pump bodies disposed around the cam mechanism at every 90 degrees with an equal distance, and only one of the four pump bodies is operated by the contact ring at a time.  
   
   
       8 . The pump device according to  claim 1 , further comprising a slider which is provided in the cam mechanism and relatively rotatably mounted with respect to the eccentric member, 
 wherein, when the eccentric member is rotated, the diaphragm is moved in the radial direction of the output shaft while the slider is relatively rotated with respect to the eccentric member.    
   
   
       9 . The pump device according to  claim 8 , further comprising: 
 a pressure chamber which is closed by the diaphragm and is in communication with an inflow passage and an outflow passage; and    a projecting part for moving the diaphragm which is formed on an opposite side to the pressure chamber with respect to the diaphragm,    wherein, when the pressure of the pressure chamber increases with the diaphragm being pushed by the slider through the projecting part, fluid flows out from the pressure chamber and, when the diaphragm is returned by the slider through the projecting part, the pressure of the pressure chamber decreases to make fluid flow into the pressure chamber.    
   
   
       10 . A pump device comprising: 
 an eccentric member mounted on a output shaft;    a cam mechanism which is engaged with the eccentric member to convert a motion of the output shaft into a radial direction; and    at least one pump body comprising a diaphragm that is moved in the radial direction in relation to the output shaft by the cam mechanism for performing a pumping operation.    
   
   
       11 . The pump device according to  claim 10 , wherein the output shaft moves in discrete steps of rotation.  
   
   
       12 . The pump device according to  claim 10  wherein the cam mechanism includes a contact ring which is rotatably mounted with respect to the eccentric member and is structured so that when the eccentric member is rotated, the contact ring makes the diaphragm move in the radial direction relative to the output shaft while the contact ring relatively rotates with respect to the eccentric member.  
   
   
       13 . The pump device according to  claim 10 , further comprising: 
 a pressure chamber which is closed by the diaphragm and is in communication with an inflow passage and an outflow passage; and    a projecting part for moving the diaphragm which is formed on an opposite side to the pressure chamber with respect to the diaphragm,    wherein, when the pressure of the pressure chamber increases with the diaphragm being pushed by the contact ring through the projecting part, fluid flows out from the pressure chamber and, when the diaphragm returns, the pressure of the pressure chamber decreases to make fluid flow into the pressure chamber.    
   
   
       14 . The pump device according to  claim 13 , wherein a fluorine coating is applied to the projecting part of the diaphragm.  
   
   
       15 . The pump device according to  claim 13 , wherein the projecting part of the diaphragm is covered with material having an abrasion resistance property and a low friction coefficient.  
   
   
       16 . The pump device according to  claim 12 , wherein the plurality of pump bodies are four pump bodies disposed around the cam mechanism at every 90 degrees with an equal distance, and only one of the four pump bodies is operated by the contact ring at a time.  
   
   
       17 . The pump device according to  claim 10 , further comprising a slider which is provided in the cam mechanism and relatively rotatably mounted with respect to the eccentric member, 
 wherein, when the eccentric member is rotated, the diaphragm is moved in the radial direction of the output shaft while the slider is relatively rotated with respect to the eccentric member.    
   
   
       18 . The pump device according to  claim 15 , further comprising: 
 a pressure chamber which is closed by the diaphragm and is in communication with an inflow passage and an outflow passage; and    a projecting part for moving the diaphragm which is formed on an opposite side to the pressure chamber with respect to the diaphragm,    wherein, when the pressure of the pressure chamber increases with the diaphragm being pushed by the slider through the projecting part, fluid flows out from the pressure chamber and, when the diaphragm is returned by the slider through the projecting part, the pressure of the pressure chamber decreases to make fluid flow into the pressure chamber.