Liquid supply system

Abstract

A liquid supply system in which the generation of twisting of a bellows is prevented. The liquid supply system has a first bellows 130 which is fixed to a shaft 150 and expands or contracts in accordance with the reciprocating motion of the shaft 150 and a second bellows 200 which expands or contracts in accordance with the reciprocating motion of the shaft 150 . The second bellows 200 and the first bellows 130 forms a pump chamber therebetween and the second bellows 200 has an outer diameter smaller than an outer diameter of the first bellows 130 . One end of the second bellows 200 is fixed to one of the shaft 150 and a cylindrical member 161 , and the other end of the second bellows 200 is positioned to the other of the shaft 150 and the cylindrical member 161 in a state being allowed to move in a circumferential direction.

1 . A liquid supply system, comprising:
 a container;   a shaft which extending from the outside to the inside of the container and configured to perform reciprocating motion by a driving source;   a cylindrical member which is disposed in the container, through which the shaft is inserted;   a first bellows which is fixed to the shaft and configured to expand and contract in accordance with the reciprocating motion of the shaft; and   a second bellows which is configured to expand and contract in accordance with the reciprocating motion of the shaft, the second bellows and the first bellows forming a pump chamber therebetween and the second bellows having an outer diameter smaller than an outer diameter of the first bellows, wherein   one end of the second bellows is fixed to one of the shaft and the cylindrical member, and   the other end of the second bellows is positioned to the other of the shaft and the cylindrical member in a state being allowed to move in a circumferential direction.   
     
     
         2 . The liquid supply system according to  claim 1 , wherein
 a seal portion is disposed on the other end of the second bellows, the seal portion being configured to have a contact with the other of the shaft and the cylindrical member to seal fluid and having a larger area than an effective area of the second bellows.   
     
     
         3 . The liquid supply system according to  claim 1 , further comprising:
 a third bellows which is configured to expand and contract in accordance with the reciprocating motion of the shaft, the third bellows forming a sealed space between the cylindrical member and the second bellows and the third bellows, wherein   a part of liquid transferred from the pump chamber is supplied to the sealed space.   
     
     
         4 . The liquid supply system according to  claim 3 , wherein one end of the third bellows is fixed to one of the shaft and the cylindrical member, and
 the other end of the third bellows is positioned to the other of the shaft and the cylindrical member in a state being allowed to move in the circumferential direction.