Treatment liquid spray nozzle

1 . A treatment liquid spray nozzle comprising:

a body having a mixing space portion formed therein to mix a first treatment liquid and a second treatment liquid, a first inlet formed on top of the body in such a way as to communicate with the mixing space portion to allow the first treatment liquid to flow into the mixing space portion, a second inlet formed on a side peripheral surface of the body in such a way as to communicate with the mixing space portion to allow the second treatment liquid to flow into the mixing space portion, and a spray hole formed on the a bottom of the body in such a way as to communicate with the mixing space portion; and a rotational flow guiding part disposed in the mixing space portion in such a way as to allow both ends of the rotational flow guiding part to face the first inlet and the spray hole respectively and having a spiral guide with a spiral groove formed on an outer peripheral surface of the rotational flow guiding part,

wherein an upper perforated plate is disposed above the spiral guide to be coupled with an inner peripheral surface of the mixing space portion, and one or more lower perforated plates are disposed below the spiral guide to be coupled with the inner peripheral surface of the mixing space portion,

wherein cross-sectional area of the mixing space portion in which the lower perforated plate is installed is formed smaller than cross-sectional area of the mixing space portion in which the upper perforated plate is installed, and the second inlet is arranged horizontally below the upper perforated plate and is arranged along the tangential line of the inner peripheral surface of the mixing space portion.

2 . The treatment liquid spray nozzle according to claim 1 , wherein the spiral guide has a circular cross-sectional shape, while having a tapered shape becoming narrower from an upper portion toward a lower portion of the spiral guide.

3 . The treatment liquid spray nozzle according to claim 1 , wherein one or more lower perforated plates are located under the spiral guide, and cross-sectional area of the mixing space portion where the lower perforated plates are located are smaller than cross-sectional area of the mixing space portion where the upper perforated plate is located.

4 . The treatment liquid spray nozzle according to claim 1 , wherein the rotational flow guiding part further comprises a top coupling bar extending upward from top of the spiral guide in such a way as to be coupled to the upper perforated plate.

5 . The treatment liquid spray nozzle according to claim 1 , wherein the rotational flow guiding part further comprises a bottom coupling bar extending downward from the underside of the spiral guide in such a way as to be coupled to at least one of the lower perforated plates.

6 . The treatment liquid spray nozzle according to claim 4 , wherein upper part of the top coupling bar faces the first inlet and has cross-sectional area that gradually decreases upward.

7 . The treatment liquid spray nozzle according to claim 1 , wherein the body comprises:

a mixing body having the mixing space portion formed in the mixing body and a top opening and a bottom opening formed on top and bottom of the mixing body respectively in such a way as to communicate with the mixing space portion;

an upper cover detachably coupled to the top opening and having the first inlet penetrating up and down into the upper cover; and

a lower cover detachably coupled to the bottom opening and having the spray hole penetrating into the lower cover.

8 . The treatment liquid spray nozzle according to claim 7 , wherein the mixing body has one or more perforated plates detachably coupled to the mixing body above or under the spiral guide inside the mixing space portion in a transverse direction with respect to the spray direction of the treatment liquids, and the rotational flow guiding part is detachably coupled to at least one of the perforated plates.

9 . The treatment liquid spray nozzle according to claim 8 , wherein one of the perforated plates is inserted into the bottom opening of the mixing body, and the through holes formed on the perforated plate inserted into the bottom opening are smaller in diameter than the through holes of the perforated plates disposed on different positions from the bottom opening.