Fluid transportation system

Abstract

A fluid transportation system includes: a micropump provided with a chamber and a diaphragm driven by an actuator; fluid communication sections communicating with both ends of the chamber of the micropump; a pressure absorbing section that is provided at least one of the fluid communication sections so as to absorb or reduce a fluid vibration pressure; and a narrow section that is provided at a position further than the pressure absorbing section from the chamber so as to narrow a flow path cross-section, wherein, when R represents a flow path resistance value of the narrow section and C represents an acoustic capacitance value of the pressure absorbing section, a value obtained by multiplication between R and C is not smaller than a driving cycle period value of the micropump.

1 . A fluid transportation system, comprising: 
 a micropump provided with a chamber and a diaphragm driven by an actuator;    fluid communication sections communicating with both ends of the chamber of the micropump;    a pressure absorbing section that is provided at least one of the fluid communication sections so as to absorb or reduce a fluid vibration pressure; and    a narrow section that is provided at a position further than the pressure absorbing section from the chamber so as to narrow a flow path cross-section,    wherein,    when R represents a flow path resistance value of the narrow section and C represents an acoustic capacitance value of the pressure absorbing section, a value obtained by multiplication between R and C is not smaller than a driving cycle period value of the micropump.    
   
   
       2 . The fluid transportation system of  claim 1 , wherein the narrow section is disposed on the downstream side, along a transportation direction, of the chamber.  
   
   
       3 . The fluid transportation system of  claim 1 , wherein the micropump transports fluid by repeatedly deforming the diaphragm; and 
 an acoustic capacitance of the pressure absorbing section has a larger value than an acoustic capacitance of the chamber.    
   
   
       4 . The fluid transportation system of  claim 1 , wherein 
 at least one wall surface of the pressure absorbing section comprises a thin plate deformable by a fluid pressure; and    a width of the thin plate is larger than a width of the chamber.    
   
   
       5 . The fluid transportation system of  claim 1 , wherein 
 a flow path resistance value of the narrow section is smaller than an effective inner flow path resistance value of the micropump.    
   
   
       6 . The fluid transportation system of  claim 1 , comprising a first throttle flow path and a second throttle flow path at the both ends of the chamber, of which respective flow path resistances change corresponding to a differential pressure, wherein, 
 a changing rate of the flow path resistance of the first throttle flow path is larger than that of the second throttle flow path;    the actuator transports fluid from the first throttle flow path toward the second throttle flow path, by repeatedly increasing and decreasing a pressure of fluid in the chamber in a first pattern where a time of increasing the pressure is shorter than a time of decreasing the pressure; and    the actuator transports fluid from the second throttle flow path toward the first throttle flow path, by repeatedly increasing and decreasing the pressure of fluid in the chamber in a second pattern where the time of increasing the pressure is longer than the time of decreasing the pressure.    
   
   
       7 . A fluid transportation system, comprising: 
 a micropump provided with a chamber and a diaphragm driven by an actuator;    fluid communication sections communicating with both ends of the chamber of the micropump;    a pressure absorbing section that is provided at least one of the fluid communication sections so as to absorb or reduce a fluid vibration pressure; and    a filtering section having a plurality of micro flow paths, the filtering section being provided at a position further than the pressure absorbing section from the chamber,    wherein,    when R represents a flow path resistance value of the filtering section and C represents an acoustic capacitance value of the pressure absorbing section, a value obtained by multiplication between R and C is not smaller than a driving cycle period value of the micropump.    
   
   
       8 . The fluid transportation system of  claim 7 , wherein the filtering section is disposed on the upstream side, along a transportation direction, of the chamber.  
   
   
       9 . The fluid transportation system of  claim 7 , wherein the micropump transports fluid by repeatedly deforming the diaphragm; and 
 an acoustic capacitance of the pressure absorbing section has a larger value than an acoustic capacitance of the chamber.    
   
   
       10 . The fluid transportation system of  claim 7 , wherein 
 at least one wall surface of the pressure absorbing section comprises a thin plate deformable by a fluid pressure; and    a width of the thin plate is larger than a width of the chamber.    
   
   
       11 . The fluid transportation system of  claim 7 , wherein 
 a flow path resistance value of the filtering section is smaller than an effective inner flow path resistance value of the micropump.    
   
   
       12 . The fluid transportation system of  claim 7 , comprising a first throttle flow path and a second throttle flow path at the both ends of the chamber, of which respective flow path resistances change corresponding to a differential pressure, wherein, 
 a changing rate of the flow path resistance of the first throttle flow path is larger than that of the second throttle flow path;    the actuator transports fluid from the first throttle flow path toward the second throttle flow path, by repeatedly increasing and decreasing a pressure of fluid in the chamber in a first pattern where a time of increasing the pressure is shorter than a time of decreasing the pressure; and    the actuator transports fluid from the second throttle flow path toward the first throttle flow path, by repeatedly increasing and decreasing the pressure of fluid in the chamber in a second pattern where the time of increasing the pressure is longer than the time of decreasing the pressure.    
   
   
       13 . A fluid transportation system, comprising: 
 a micropump provided with a chamber and a diaphragm driven by an actuator;    fluid communication sections communicating with both ends of the chamber of the micropump;    a first pressure absorbing section that is provided at one of the fluid communication sections so as to absorb or reduce a fluid vibration pressure;    a narrow section that is provided at a position further than the first pressure absorbing section from the chamber so as to narrow a flow path cross-section,    a second pressure absorbing section that is provided at another one of the fluid communication sections so as to absorb or reduce a fluid vibration pressure;    a filtering section having a plurality of micro flow paths, the filtering section being provided at a position further than the second pressure absorbing section from the chamber,    wherein,    when R represents a flow path resistance value of the narrow section and C represents an acoustic capacitance value of the first pressure absorbing section, a value obtained by multiplication between R and C is not smaller than a driving cycle period value of the micropump; and    when R′ represents a flow path resistance value of the filtering section and C′ represents an acoustic capacitance value of the second pressure absorbing section, a value obtained by multiplication between R′ and C′ is not smaller than the driving cycle period value of the micropump.    
   
   
       14 . The fluid transportation system of  claim 13 , wherein 
 the narrow section is disposed on the downstream side, along a transportation direction, of the chamber; and    the filtering section is disposed on the upstream side, along the transportation direction, of the chamber.    
   
   
       15 . The fluid transportation system of  claim 13 , wherein the micropump transports fluid by repeatedly deforming the diaphragm; and 
 acoustic capacitances of the first and second pressure absorbing sections have larger values than an acoustic capacitance of the chamber.    
   
   
       16 . The fluid transportation system of  claim 13 , wherein 
 at least one wall surface of each of the first and second pressure absorbing sections comprises a thin plate deformable by a fluid pressure; and    a width of each thin plate is larger than a width of the chamber.    
   
   
       17 . The fluid transportation system of  claim 13 , wherein 
 flow path resistance values of the narrow section and the filtering section are smaller than an effective inner flow path resistance value of the micropump.    
   
   
       18 . The fluid transportation system of  claim 13 , comprising a first throttle flow path and a second throttle flow path at the both ends of the chamber, of which respective flow path resistances change corresponding to a differential pressure, wherein, 
 a changing rate of the flow path resistance of the first throttle flow path is larger than that of the second throttle flow path;    the actuator transports fluid from the first throttle flow path toward the second throttle flow path, by repeatedly increasing and decreasing a pressure of fluid in the chamber in a first pattern where a time of increasing the pressure is shorter than a time of the pressure; and    the actuator transports fluid from the second throttle flow path toward the first throttle flow path, by repeatedly increasing and decreasing the pressure of fluid in the chamber in a second pattern where the time of increasing the pressure is longer than the time of decreasing the pressure.