Oil suction pump

Abstract

An oil suction pump has an air outlet normally closed by a valve controlled via a compression spring, and the valve may be pushed backward by flowing air to open the air outlet. Therefore, the oil suction pump may be connected to an air compressor or to a manual air pump to obtain flowing air to push backward the valve and thereby open the air outlet and vacuumize a container connected to the oil suction pump for sucking oil into the container. A user may freely select to operate the oil suction pump via the air compressor or the manual air pump depending on actual need.

1 . An oil suction pump, comprising a cover mounted to a front end of an air outlet of said oil suction pump, a manual air pump externally connected to a shell of said oil suction pump, and an oil suction pipe holder externally connected to the shell of said oil suction pump; and said manual air pump being provided with a movable connector identical to an air inlet connector that is usually provided on an air compressor, and a relief valve.  
   
   
       2 . The oil suction pump as claimed in  claim 1 , wherein said cover consists of a housing, a muffle, and a valve set.  
   
   
       3 . The oil suction pump as claimed in  claim 2 , wherein said housing is provided on an inner wall surface of a rear end close to the front end of said air outlet with screw threads.  
   
   
       4 . The oil suction pump as claimed in  claim 3 , wherein said housing is provided on a circumferential wall with several rows of axially sequentially arranged vents.  
   
   
       5 . The oil suction pump as claimed in  claim 4 , wherein said housing has a front end having a radially inward projected portion, a center of which is molded into a sleeve seat.  
   
   
       6 . The oil suction pump as claimed in  claim 5 , wherein said sleeve seat has an inner bore, and a radially inward annular projection formed in said inner bore near an inner end thereof.  
   
   
       7 . The oil suction pump as claimed in  claim 2 , wherein said valve set includes a base, a compression spring, and a sealing head.  
   
   
       8 . The oil suction pump as claimed in  claim 7 , wherein said base is provided around an outer circumferential surface with an annular groove.  
   
   
       9 . The oil suction pump as claimed in  claim 7 , wherein said base is provided at a central area with a bore.  
   
   
       10 . The oil suction pump as claimed in  claim 7 , wherein said sealing head has a front portion in the form of a cylindrical body, and a long shaft rearward extended from said front portion.  
   
   
       11 . The oil suction pump as claimed in  claim 10 , wherein said front cylindrical body of said sealing head includes a neck portion and an airtight seal ring mounted on said neck portion.  
   
   
       12 . The oil suction pump as claimed in  claim 11 , wherein said compression spring of said valve set normally pushes said front portion of said sealing head against a front opening of said air outlet of said oil suction pump, with said airtight seal ring on said neck portion of said sealing head tightly sealing said front opening of said air outlet.