Liquid pump

Abstract

The invention is directed to provide a liquid pump (lubricant circulation or lubricant supply pump) that is capable of lubricating a machine or apparatus even in a case that a passage supplying a liquid (lubricant) is in a vacuum condition. To solve the above, the invention is characterized in a liquid pump (lubricant circulation or lubricant supply pump) for delivering a liquid (lubricant) from a liquid storing portion (lubricant storing portion) to a predetermined position of at least one location, wherein at least one cylinder chamber is formed inside of the pump, a piston is arranged to reciprocate by a driving means in the cylinder chamber, the cylinder chamber is communicated with a liquid (lubricant) delivery port, so that the liquid (lubricant) discharged into a fluid passage communicating with the predetermined position of at least one location, the driving means is provided with a solenoid including an axial portion all of which or at least a part of which is made of a ferromagnetic substance and a solenoid coil that are relatively movable to each other, the axial portion all of which or at least a part of which is made of the ferromagnetic substance and the cylinder chamber are fixed by a predetermined means.

1 . A liquid pump characterized in a liquid pump for delivering a liquid from a liquid storing portion to a predetermined position of at least one location, wherein at least a cylinder chamber for introducing the liquid from the liquid storing portion is formed, a piston is arranged at the cylinder chamber, the cylinder chamber is formed with a liquid delivery port, and the piston includes driving means for driving a cylinder in an axial direction in the cylinder chamber.  
   
   
       2 . The liquid pump according to  claim 1 , characterized in that the piston is inserted from one end of the cylinder chamber and other end portion of the cylinder chamber is arranged with the liquid delivery port.  
   
   
       3 . The liquid pump according to  claim 1 , characterized in that a pair of the cylinder chambers are arranged at both ends of the piston, the piston is inserted from one end of each of the cylinder chambers, and other end of each of the cylinder chambers is opened with the liquid delivery port.  
   
   
       4 . The liquid pump according to  claim 2 , characterized in that sectional shapes and/or lengths of the piston and the cylinder chamber are optimized in accordance with an amount of supplying the liquid in the piston and the cylinder chamber.  
   
   
       5 . The liquid pump according to  claim 1 , characterized in that the piston is inserted into the cylinder chamber and the cylinder chamber is formed with a single or a plurality of the liquid delivery ports.  
   
   
       6 . The liquid pump according to  claim 5 , characterized in that a structure of forming a single of a plurality of stages of stepped portions at the cylinder chamber is constituted, the piston is formed by a shape to be substantially equal to a shape of the cylinder chamber, and the liquid delivery ports are arranged at the single or the plurality of respective stepped portions formed at the cylinder chamber are arranged.  
   
   
       7 . The liquid pump according to  claim 6 , characterized in that the single or the plurality of stepped portions of the cylinder chamber are formed to be substantially symmetrical in an axial direction, the piston is formed by a shape substantially equal to shapes of the substantially symmetrical stepped portions, and the single or the plurality of respective stepped portions formed at the cylinder chamber are formed with the liquid delivery ports.  
   
   
       8 . The liquid pump according to  claim 7 , characterized in that the cylinder chamber is arranged with a member for forming the single or the plurality of stepped portions substantially symmetrically.  
   
   
       9 . The liquid pump according to  claim 5 , characterized in that relative lengths in the axial direction and/or sectional areas orthogonal to an axis of the cylinder chamber and the piston are optimized in accordance with an amount of supplying the liquid by a shape of a liquid storage formed between the cylinder chamber and the piston.  
   
   
       10 . The liquid pump according to  claim 5 , characterized in that the cylinder chamber is provided with a liquid drawing hole.  
   
   
       11 . The liquid pump according to  claim 5 , characterized in that a plurality of structures each formed with the single or the plurality of stages of stepped portions at the cylinder chamber are arranged in series.  
   
   
       12 . The liquid pump according to  claim 1 , characterized in that pluralities of the pistons and the cylinder chambers are provided for single driving means.  
   
   
       13 . The liquid pump according to  claim 1 , characterized in that the driving means is constituted by a solenoid including a shaft portion a total or a portion of which comprises a magnetic member and a solenoid coil capable of moving relative to each other, the shaft portion and the solenoid coil isolated by a partition wall therebetween are brought into noncontract with each other, and the shaft portion and the piston are cooperatively moved by predetermined connecting means.  
   
   
       14 . The liquid pump according to  claim 13 , characterized in that a partition wall comprising a nonmagnetic member is used for the partition wall.  
   
   
       15 . A vacuum pump characterized in that the liquid pump according to  claim 13  is used as a lubricant circulating or a lubricant supplying pump, and a portion needing to lubricate and a lubricating path of an essential portion for delivering a lubricant of the lubricant circulating or the lubricant supplying pump are hermetically sealed.  
   
   
       16 . An apparatus having a rotating portion characterized in an apparatus having a rotating portion needing a lubricant to lubricate the rotating portion, wherein a lubricant storing tank for storing the lubricant communicating with the apparatus having the rotating portion to make the lubricant flow thereto is formed, and a lubricant circulating or a lubricant supplying pump and a supply path for supplying the oil from the lubricant storing tank to a predetermined portion needing to lubricate are arranged.  
   
   
       17 . The apparatus having a rotating portion according to  claim 16 , characterized in that an essential portion for delivering the lubricant of the lubricant circulating or lubricant supplying pump is integrally formed at inside of the lubricant storing tank.  
   
   
       18 . The apparatus having a rotating portion according to  claim 16 , characterized in that the lubricant storing tank is arranged at a position at which the lubricant of the apparatus having the rotating portion is made to flow by a gravitational force.  
   
   
       19 . The apparatus having a rotating portion according to  claim 16 , characterized in that the liquid pump according to any one of claims  1  through  14  is used as the pump.