Fluid transfer pump

Abstract

A fluid transfer pump comprises a cylinder having a suction opening and a discharge opening, a plunger provided within the cylinder movable to and fro in a direction of an axis line of the cylinder, and a membrane-like sealing member for sealing a gap between the cylinder and the plunger, wherein the plunger is driven to and fro for carrying out suction operation and discharge operation alternately, so that fluid is sucked through the suction opening, then the sucked fluid is discharged through the discharge opening, wherein the suction opening is provided on a side portion of the cylinder so that a fluid transfer pump is provided which has an extremely small accumulation rate of fluid, and has good fluid displacement characteristic.

1 . A fluid transfer pump comprising: 
 A cylinder having a suction opening and a discharge opening;    A plunger provided within the cylinder movable to and fro in a direction of an axis line of the cylinder; and    A membrane-like sealing member for sealing a gap between the cylinder and the plunger,    Wherein the plunger is driven to and fro for carrying out suction operation and discharge operation alternately, so that fluid is sucked through the suction opening, then the sucked fluid is discharged through the discharge opening,    Wherein the suction opening is provided on a side portion of the cylinder.    
   
   
       2 . A fluid transfer pump as set forth in  claim 1 , wherein the suction opening is provided within an extent which allows forming of the gap when the plunger reaches an upper dead point.  
   
   
       3 . A fluid transfer pump as set forth in  claim 1 , wherein the suction opening is provided so that an axis line of the suction opening is inclined at an angle which is equal to or less than 90 degrees, with respect to the axis line of the cylinder.  
   
   
       4 . A fluid transfer pump as set forth in  claim 2 , wherein the suction opening is provided so that an axis line of the suction opening is inclined at an angle which is equal to or less than 90 degrees, with respect to the axis line of the cylinder.  
   
   
       5 . A fluid transfer pump as set forth in  claim 1 , wherein the suction opening is provided so that an axis line of the suction opening is inclined at an angle which is less than 90 degrees, with respect to a line which is orthogonal to the axis line of the cylinder.  
   
   
       6 . A fluid transfer pump as set forth in  claim 2 , wherein the suction opening is provided so that an axis line of the suction opening is inclined at an angle which is less than 90 degrees, with respect to a line which is orthogonal to the axis line of the cylinder.  
   
   
       7 . A fluid transfer pump as set forth in  claim 3 , wherein the suction opening is provided so that an axis line of the suction opening is inclined at an angle which is less than 90 degrees, with respect to a line which is orthogonal to the axis line of the cylinder.  
   
   
       8 . A fluid transfer pump as set forth in  claim 1 , wherein the membrane-like sealing member consists of a cap-like member made of flexible material, wherein a body section of the cap-like member covers the plunger under a condition that an opening edge section of the cap-like member is secured on an inner face of the cylinder, and wherein the gap is sealed by a U-shaped turn back which is formed by turning back downwardly within the gap between the cylinder and the plunger.  
   
   
       9 . A fluid transfer pump as set forth in  claim 2 , wherein the membrane-like sealing member consists of a cap-like member made of flexible material, wherein a body section of the cap-like member covers the plunger under a condition that an opening edge section of the cap-like member is secured on an inner face of the cylinder, and wherein the gap is sealed by a U-shaped turn back which is formed by turning back downwardly within the gap between the cylinder and the plunger.  
   
   
       10 . A fluid transfer pump as set forth in  claim 3 , wherein the membrane-like sealing member consists of a cap-like member made of flexible material, wherein a body section of the cap-like member covers the plunger under a condition that an opening edge section of the cap-like member is secured on an inner face of the cylinder, and wherein the gap is sealed by a U-shaped turn back which is formed by turning back downwardly within the gap between the cylinder and the plunger.  
   
   
       11 . A fluid transfer pump as set forth in  claim 4 , wherein the membrane-like sealing member consists of a cap-like member made of flexible material, wherein a body section of the cap-like member covers the plunger under a condition that an opening edge section of the cap-like member is secured on an inner face of the cylinder, and wherein the gap is sealed by a U-shaped turn back which is formed by turning back downwardly within the gap between the cylinder and the plunger.  
   
   
       12 . A fluid transfer pump as set forth in  claim 1 , wherein the cylinder is disposed so that the axis line is vertical.  
   
   
       13 . A fluid transfer pump as set forth in  claim 2 , wherein the cylinder is disposed so that the axis line is vertical.  
   
   
       14 . A fluid transfer pump as set forth in  claim 3 , wherein the cylinder is disposed so that the axis line is vertical.  
   
   
       15 . A fluid transfer pump as set forth in  claim 4 , wherein the cylinder is disposed so that the axis line is vertical.  
   
   
       16 . A fluid transfer pump as set forth in  claim 5 , wherein the cylinder is disposed so that the axis line is vertical.