Pumping Device

Abstract

A pumping device includes a frame body, a pump body, a piston rod, a drive shaft, a main guiding member, a carrier block, a plug unit, and a rotary-to-linear motion conversion mechanism disposed between the carrier block and the drive shaft so as to convert rotation of the drive shaft to linear motion of the carrier block. A shaft axis of the drive shaft and a piston axis of the piston rod cooperatively define a vertical plane. A bottom surface of the carrier block is guided by the main guiding member and defines a bottom plane which is orthogonal to the vertical plane.

What is claimed is: 
     
         1 . A pumping device comprising:
 a frame body extending in a longitudinal direction and having front and rear ends, and a main chamber defined between said front and rear ends, said front end having a passage extending therethrough and along a passage axis;   a pump body defining an elongated duct extending along a pump axis, and disposed forwardly of said front end such that said elongated duct is aligned with said passage with the passage axis in line with the pump axis, said pump body having an outlet port disposed downstream of said elongated duct, and an inlet port which is in fluid communication with said elongated duct, and which is disposed upstream of said outlet port;   a piston rod which is disposed in said elongated duct for reciprocating linear motion therein, and which extends along a piston axis toward said outlet port to terminate at a head end, and through said passage into said main chamber to terminate at a fixed end;   a drive shaft configured to be journaled in said front and rear ends so as to be rotatable about a shaft axis which is parallel to the piston axis and which is opposite to the piston axis in a transverse direction relative to the longitudinal direction, the shaft axis and the piston axis cooperatively defining a vertical plane therebetween;   a main guiding member disposed under said drive shaft, and defining a guideway extending in the longitudinal direction;   a carrier block having
 a bottom surface configured to be guided by said guideway, and defining a bottom plane orthogonal to the vertical plane, 
 a top surface opposite to said bottom surface in the transverse direction, 
 a forward surface facing toward said front end, 
 a rearward surface opposite to said forward surface in the longitudinal direction, 
 a cavity extending through said forward and rearward surfaces along a cavity axis, and including a smaller-dimension front subcavity, a larger-dimension rear subcavity, and a shoulder abutting surface therebetween, and 
 a through bore configured to permit said drive shaft to pass through said forward and rearward surfaces; 
   a plug unit having a grip hole which is configured to permit said fixed end to be fitted therein, said plug unit being configured to be plugged in said smaller-dimension front subcavity such that said fixed end is retained in said grip hole to thereby permit said piston rod to be moved with said carrier block; and   a rotary-to-linear motion conversion mechanism disposed between said drive shaft and said carrier block so as to convert rotation of said drive shaft to linear motion of said carrier block to thereby permit said carrier block to move along said guideway when said drive shaft is driven to rotate.   
     
     
         2 . The pumping device according to  claim 1 , wherein said plug unit includes a plug body disposed in said smaller-dimension front subcavity, and a plug head abutting against said shoulder abutting surface. 
     
     
         3 . The pumping device according to  claim 2 , wherein said pumping device comprises two of said carrier blocks and two of said plug units, said carrier blocks being displaced from each other in the longitudinal direction, said piston rod extending through a front one of said carrier blocks to a rear one of said carrier blocks. 
     
     
         4 . The pumping device according to  claim 3 , further comprising a spacer sleeve which is disposed between said carrier blocks and mounted to one of said carrier blocks, and which is sleeved on said drive shaft. 
     
     
         5 . The pumping device according to  claim 1 , further comprising an auxiliary guiding member disposed opposite to said main guiding member in the transverse direction, said carrier block further including a protruding member disposed on said top surface thereof and configured to be guided by said auxiliary guiding member. 
     
     
         6 . The pumping device according to  claim 1 , further comprising a driving unit having an output shaft configured to be coupled to said drive shaft so as to transmit a driving force to rotate said drive shaft. 
     
     
         7 . The pumping device according to  claim 1 , wherein said piston rod is disposed above said drive shaft. 
     
     
         8 . The pumping device according to  claim 1 , wherein said plug unit is made from a deformable material.