Liquid supply system

Abstract

A liquid supply system that can be cooled efficiently. The liquid supply system 10 includes a container having an inlet 131 b and an outlet 131 c for liquid and provided with pump chambers P 1 , P 2 inside it, supply passages 131 e, 131 Xc through which the liquid flowing in through the inlet 131 b is supplied to the pump chambers P 1 , P 2 , and a discharge passage 131 Xd through which the liquid discharged from the pump chambers P 1 , P 2 is brought to the outlet 131 c . Portions 180, 181 of an inner surface of the liquid supply system 10 that are in contact with the liquid are each provided with an increased surface structure 400 having an increased liquid contact area and extending along the direction L 1 , L 2 of flow of the liquid.

1 . A liquid supply system comprising:
 a container having an inlet and an outlet for liquid and provided with a pump chamber inside it;   a supply passage through which the liquid flowing in through the inlet is supplied to the pump chamber; and   a discharge passage through which the liquid discharged from the pump chamber is brought to the outlet,   wherein a portion of an inner surface of the liquid supply system that is in contact with the liquid is provided with an increased surface structure having an increased liquid contact area and extending along the direction of flow of the liquid.   
     
     
         2 . The liquid supply system according to  claim 1 , wherein the increased surface structure includes depressions and projections. 
     
     
         3 . The liquid supply system according to  claim 1 , wherein the increased surface structure is provided in the pump chamber. 
     
     
         4 . The liquid supply system according to  claim 3 , wherein the pump chamber has a substantially axisymmetric shape, a pump inlet with which the supply passage is joined is provided on one axial side of the pump chamber, a pump outlet with which the discharge passage is joined is provided on the other axial side of the pump chamber, and the increased surface structure is provided uniformly along the axial direction of the pump chamber. 
     
     
         5 . The liquid supply system according to  claim 1 , wherein the increased surface structure is provided in the supply passage and the discharge passage. 
     
     
         6 . The liquid supply system according  claim 1 , comprising:
 a shaft member that moves vertically upward and downward in the container; and   a first bellows and a second bellows disposed one above the other along the vertical direction, each of which expands and contracts with upward and downward motion of the shaft member;   wherein the pump chamber includes a first pump chamber formed by a space surrounding the outer circumference of the first bellows and a second pump chamber formed by a space surrounding the outer circumference of the second bellows, and the increased surface structure includes depressions and projections that are provided on an inner surface of a wall that defines the space surrounding the outer circumference of the first bellows in the first pump chamber and extend parallel to the direction of expansion and contraction of the first bellows and depressions and projections that are provided on an inner surface of a wall that defines the space surrounding the outer circumference of the second bellows in the second pump chamber and extend parallel to the direction of expansion and contraction of the second bellows.