Pneumatic automatic reversing transfer pump

Abstract

The utility model discloses a pneumatic automatic reversing feeding pump, which belongs to the technical field of pneumatic pumps, and it comprises a pneumatic part, a connecting part, and a pumping part. The pneumatic part adopts the design structure of a square cylinder; the design structure of a square integrated reversing valve and valve plate; the spherical piston rod connection structure; the pneumatic part and the hydraulic part are easy to install and dismantle with the clamp design structure. The hydraulic part includes a bung adapter assembly, a pump body, a up suction tube, a lower suction tube, an intake valve, and other related parts. It has a reasonable structural design, simple operation, seamless transition between forward and reverse strokes, easy installation, and maintenance, better sealing effect, strong reliability, and can be applied to various working environments

1 . A pneumatic pump assembly for liquid products, the pneumatic pump assembly comprising:
 a cylinder;   a cylinder cap coupled to a top of the cylinder;   a cylinder base coupled to a bottom of the cylinder;   a piston head of a piston slidably received within the cylinder, a piston rod of the piston passes through the cylinder base, wherein a top of the piston head and the cylinder cap form an upper chamber, wherein a bottom of the piston head and the cylinder base form a lower chamber;   an upper pilot valve disposed in the cylinder cap, wherein the upper pilot valve comprises a first spring and a first gasket, wherein the first spring in an extended state results in closing of the upper pilot valve and the first spring in a compressed state results in opening of the upper pilot valve;   a lower pilot valve disposed in the cylinder base, wherein the lower pilot valve comprises a second spring and a gasket, wherein the spring in an extended state results in closing of the upper pilot valve and the spring in a compressed state results in opening of the upper pilot valve; and   a directional control valve configured to direct air from a pressurized air source to the upper chamber and the lower chamber, the directional control valve configured to switch between an up mode and a down mode by actuation of the upper pilot valve and the lower pilot valve, wherein the air is directed to the upper chamber in the up mode and to the lower chamber in the down mode, the directional control valve comprises:
 reversing valve shaft that has an upper shaft head and a lower shaft head, wherein the reversing valve shaft is configured to be driven in a reciprocating manner by air under pressure for directing the air to the upper chamber and the lower chamber, wherein the movement of the reversing valve shaft is controlled by the upper pilot valve and the lower pilot valve; and 
 a housing encasing an upper cavity and a lower cavity, wherein the upper shaft head moves within the upper cavity and the lower shaft head moves within the lower cavity, wherein a first air path connects the upper cavity to the upper pilot valve and a second air path connects the lower cavity to the lower pilot valve, 
 wherein the upper cavity and the lower cavity have an air input port for filling air under pressure into the upper cavity and the lower cavity, wherein the air under pressure in the upper cavity and the lower cavity is configured to cause a valve core to press the gasket of each of the upper pilot valve and the lower pilot valve. 
   
     
     
         2 . The pneumatic pump assembly according to  claim 1 , wherein the upper pilot valve is configured to be actuated by the piston head during upward movement of the piston head, when the piston head strikes the upper pilot valve. 
     
     
         3 . The pneumatic pump assembly according to  claim 2 , wherein the actuation of the upper pilot valve switches the directional control valve to the up mode. 
     
     
         4 . The pneumatic pump assembly according to  claim 3 , wherein the lower pilot valve is configured to be actuated by the piston head during downward movement of the piston head, when the piston head strikes the lower pilot valve. 
     
     
         5 . The pneumatic pump assembly according to  claim 4 , wherein the actuation of the lower pilot valve switches the directional control valve to the down mode. 
     
     
         6 . The pneumatic pump assembly according to  claim 5 , wherein the directional control valve is coupled to the cylinder cap and the cylinder base through a manifold. 
     
     
         7 . (canceled) 
     
     
         8 . The pneumatic pump assembly according to claim  7 , wherein a lower air intake port is disposed in the cylinder base and the air from the directional control valve is received through a lower air duct. 
     
     
         9 . The pneumatic pump assembly according to  claim 8 , wherein an upper air intake port is disposed in the cylinder cap and the air from the directional control valve is received through an upper air duct. 
     
     
         10 . The pneumatic pump assembly according to  claim 5 , wherein the pneumatic pump assembly comprises an air motor part and a pump part, the air motor part comprises the lower pilot valve, the upper pilot valve, the piston, the directional control valve, and the cylinder. 
     
     
         11 . The pneumatic pump assembly according to  claim 10 , wherein the pump part is removably coupled to the air motor part through a clamp. 
     
     
         12 . The pneumatic pump assembly according to  claim 11 , wherein the piston of the air motor part is coupled to a second piston of the pump part through a piston rod coupler.