Cam-type pump structure for a refrigerant recycling machine

Abstract

A cam-type pump structure for a refrigerant recycling machine includes a cam device driven by a motor for pistons to be reciprocated in conjunction with cylinders and valve bodies so as to pump liquid. The pump apparatus is compact in size and has high efficiency for the demand of recycling refrigerant.

1 . A cam-type pump structure for a refrigerant recycling machine, comprising a main body, a cam device and a cylinder;
 the main body comprising a motor, the motor having an output end provided with a shaft, the main body having a space therein, the shaft of the motor being disposed in the space, the cam device being inserted on the shaft, the main body having an opening at one side thereof;   the cam device comprising a central rotating body and two eccentric rotating bodies, each of the two eccentric rotating bodies being connected with a piston, the cam device having an axial hole along a central axis thereof, the shaft being inserted through the axial hole and the eccentric rotating bodies; and   the cylinder being coupled to the opening of the main body, the cylinder having a chamber therein to receive the piston for reciprocation.   
     
     
         2 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein the main body has a casing shape, a fan being provided at an outer side of the motor, the main body having a ring portion at an outer edge of the space, the main body further comprising a plate and a rubber washer associated with an oil seal ring to seal the space, the plate and the rubber washer being connected to the ring portion with screws. 
     
     
         3 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein a distal end of the shaft is provided with a shaft bearing. 
     
     
         4 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein the two eccentric rotating bodies of the cam device are located at two sides of the central rotating body. 
     
     
         5 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein a bearing is provided at an outer end of each of the eccentric rotating bodies, an outer sleeve being provided at an outer end of the bearing, the outer sleeve having a protrusion at one end thereof, the piston being located at a distal end of the protrusion. 
     
     
         6 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein the axial hole is located at the center of the central rotating body. 
     
     
         7 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein the cylinder is connected with a valve body, the inside of the cylinder communicating with the inside of the valve body, the valve body having an inlet and an outlet. 
     
     
         8 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein the centers of the two eccentric rotating bodies are located at different axes. 
     
     
         9 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 1 , wherein the centers of the two eccentric rotating bodies are located at the same axis. 
     
     
         10 . The cam-type pump structure for a refrigerant recycling machine as claimed in  claim 9 , wherein one side of the central rotating body is provided with a counterweight block, the counterweight block being located at an opposite side relative to the eccentric rotating bodies for balance, the side of the central rotating body having an engaging groove and a threaded hole in the engaging groove, the engaging groove being adapted to receive a rib of the counterweight block, the counterweight block having a hole thereon for insertion of a screw so that the counterweight block is coupled to the central rotating body.