Structure for an air pump

Abstract

An improvement in the structure for an air pump, and in particular, an air pump, which is sealed to isolate the noise of operation, and the motor body and the cylinder, can be rapidly cooled. The improved air pump employs the circulation of air to the motor so as to lead the external air to the cylinders of the pump so as to keep the motor body and the cylinder at a cooler temperature. This allows the motor to work effectively and efficiently.

1 . An air pump comprising: 
 a motor body having a main shaft, said motor body having a front sealing cap that is provided with a plurality of air inlets;    a cylinder seat having a plurality of air holes and connected to said motor body such that said plurality of air holes are positioned in corresponding relation to the plurality of air inlets such that air is allowed to flow from the motor body into the cylinder seat, said cylinder seat having a main shaft hole to accommodate the main shaft;    a driving gear connected to said main shaft;    an eccentric gear operatively engaging the driving gear, said eccentric gear being provided with an eccentric axial member having a center shaft extending outwardly from one side of said eccentric gear and an eccentric linking shaft at an opposite side of said eccentric gear having an eccentric linking shaft, said center shaft being accommodated in a sealed hole in the cylinder seat, said eccentric gear being provided with a weight opposite to said eccentric axial member;    a piston having a piston shaft provided with a shaft seal connected to the eccentric linking shaft to allow for reciprocating movement of the piston;    a silencer cap having a top section which forms a circular engaging mount with a top section of said cylinder seat; and    a cylinder top cap positioned on said cylinder seat and having a cylinder within which said piston is reciprocated.    
   
   
       2 . The air pump as claimed in  claim 1 , wherein said eccentric gear is integrally formed with said center shaft and said eccentric linking shaft.  
   
   
       3 . The air pump as claimed in  claim 1 , wherein said motor body is enclosed in a turbulence shield, and a filtering device is mounted to a slot provided on said motor body, said filtering device including a top cover and a cap body, a surface of said top cover being provided with air holes and the circumferential edge being provided with sealing edge, and said cap body being filed with air filtering aids.  
   
   
       4 . An air pump comprising: 
 a motor body having a main shaft, said motor body having a front sealing cap that is provided with a plurality of air inlets;    a cylinder seat having a plurality of air holes and connected to said motor body such that said plurality of air holes are positioned in corresponding relation to the plurality of air inlets such that air is allowed to flow from the motor body into the cylinder seat, said cylinder seat having a main shaft hole to accommodate the main shaft;    a driving gear connected to said main shaft;    an eccentric gear operatively engaging the driving gear, said eccentric gear being provided with an eccentric axial member having a center shaft extending outwardly from one side of said eccentric gear and an eccentric linking shaft at an opposite side of said eccentric gear having an eccentric linking shaft, said center shaft being accommodated in a sealed hole in the cylinder seat, said eccentric axial member being circular in shape;    a piston having a piston shaft provided with a shaft seal connected to the eccentric linking shaft to allow for reciprocating movement of the piston;    a silencer cap having a top section which forms a circular engaging mount with a top section of said cylinder seat; and    a cylinder top cap positioned on said cylinder seat and having a cylinder within which said piston is reciprocated.    
   
   
       5 . An air pump comprising: 
 a motor body having a main shaft, said motor body having a front sealing cap that is provided with a plurality of air inlets;    a cylinder seat having a plurality of air holes and connected to said motor body such that said plurality of air holes are positioned in corresponding relation to the plurality of air inlets such that air is allowed to flow from the motor body into the cylinder seat, said cylinder seat having a main shaft hole to accommodate the main shaft;    a driving gear connected to said main shaft;    an eccentric gear operatively engaging the driving gear, said eccentric gear being provided with an eccentric axial member having a center shaft extending outwardly from one side of said eccentric gear and an eccentric linking shaft at an opposite side of said eccentric gear having an eccentric linking shaft, said center shaft being accommodated in a sealed hole in the cylinder seat, said eccentric axial member being sectorial in shape;    a piston having a piston shaft provided with a shaft seal connected to the eccentric linking shaft to allow for reciprocating movement of the piston;    a silencer cap having a top section which forms a circular engaging mount with a top section of said cylinder seat; and    a cylinder top cap positioned on said cylinder seat and having a cylinder within which said piston is reciprocated.