| CPC G01F 11/027 (2013.01) [B05B 9/0413 (2013.01); B05B 9/0838 (2013.01)] | 9 Claims |
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1. A liquid supply apparatus comprising:
a chamber configured to contain a liquid;
an injector disposed on a first side of the chamber and configured to spray the liquid;
a piston extending from a second side of the chamber toward an interior of the chamber; and
a cap provided on the second side of the chamber and having an opening,
wherein the chamber comprises:
a first area configured to store the liquid and having a width; and
a second area between the first area and the injector and having a width that is less than the width of the first area,
wherein a maximum width of a lower portion of the piston is less than the width of the first area of the chamber,
wherein the lower portion of the piston is configured to, based on a position of the lower portion, selectively seal the second area from the first area and allow the liquid to transfer between the first area and the second area by the liquid passing by the lower portion of the piston, and press the liquid in the second area to expel the liquid from the liquid supply apparatus,
wherein the piston is movably disposed within the opening,
wherein the piston is further configured to open or block a flow path, through which a gas is selectively flowable from an exterior of the chamber to the interior of the chamber, by a relative movement of the piston with respect to the cap,
wherein a first groove is provided in a first portion of an inner side surface of the opening,
wherein the piston comprises a protrusion extending along an outer side surface of the piston, and
wherein a second groove is provided in a portion of the protrusion.
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