AUTOMATIC ANALYZER
An automatic analyzer includes a sample dispensing unit that dispenses a sample into a reaction vessel, a reagent dispensing unit that dispenses a reagent, a sample nozzle cleaning tank that cleans a nozzle of the sample dispensing unit, a reagent nozzle cleaning tank that cleans a nozzle of the reagent dispensing unit, a compressor that supplies compressed air, and cleaning water supply means that supplies cleaning water. The tanks each have an upper vent that allows a nozzle to have access for cleaning, a lower vent that drains the cleaning water, a cleaning water jet port that sprays the cleaning water to the nozzle, and a compressed air jet port that removes residual cleaning water left on the nozzle. The lower vent has an opening area wider than that of the upper vent.
1 . An automatic analyzer that performs a component analysis by measuring absorbance of a reaction solution chemically reacted in a reaction vessel, the automatic analyzer comprising:
a dispensing nozzle that dispenses a reagent or a sample to be analyzed into a reaction vessel;
a cleaning tank that cleans the nozzle;
a cleaning water supply means that supplies the cleaning tank with cleaning water; and
a compressed air supply means that supplies the cleaning tank with compressed air, wherein
the cleaning tank includes
a cleaning water jet port that supplies the cleaning tank with the cleaning water supplied from the cleaning water supply means,
a compressed air jet port that jets the compressed air supplied from the compressed air supply means toward the nozzle inserted in the cleaning tank,
an upper vent that allows the nozzle to have access thereto for cleaning,
a lower vent having an opening diameter wider than that of the upper vent, the lower vent allowing the cleaning water after cleaning to be discharged out of the cleaning tank, and
a protruding part that protrudes from an outer peripheral surface thereof so as to form a space in the cleaning tank, the space having a volume greater than that of an amount of jetted compressed air.
2 . The automatic analyzer according to claim 1 , wherein the cleaning tank further includes a movable mechanism that widens an opening area of the upper vent during access by the nozzle.
3 . (canceled)
4 . The automatic analyzer according to claim 1 , wherein the cleaning tank further includes a structure that guides the jetted compressed air in the space.
5 . The automatic analyzer according to claim 1 , wherein the cleaning tank further includes a check valve disposed in the space, the check valve allowing passage of air in one direction only.
6 . The automatic analyzer according to claim 1 , wherein the cleaning tank further has a vacuum suction port connected to a vacuum means.
7 . The automatic analyzer according to claim 1 , wherein the cleaning tank has a plurality of compressed air jet ports disposed at diagonally opposite positions.