PROBLEM TO BE SOLVED: To provide a washing water supply device for a dental unit in which, an extremely simple and small sized liquid processing nozzle is a principal part in a mechanism, problems of an integration space in the surrounding of the dental unit and construction can be solved, and washing in a pipeline and removal effects of a biofilm and dental plaque in an oral cavity can be achieved at high level, even at a low flow rate level of oral cavity washing.SOLUTION: A washing water supply device for a dental unit comprises a liquid processing nozzle 1 which is detachably attached between a water feeding branch part where a washing water supply tube and a supply pipeline of washing water for mouth wash are branched, and a stop valve, the liquid processing nozzle 1 comprising: a nozzle body 2 on which a liquid channel 3 having a liquid inlet 4 on one end and a liquid outlet 5 on the other end is formed and a processing core part CORE having a collision part 8 on which mountain parts in a peripheral direction and troughs where are high flow speed parts are alternately provided and respectively protrude from an inner surface of the liquid channel 3.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】極めて単純かつ小型の液体処理ノズルを機構上の要部とし、歯科ユニット周辺の組み込みスペースや施工上の問題も容易に解決できるとともに、口腔内洗浄の低流量レベルでも配管内の清浄化や、口腔内のバイオフィルムないしプラークの除去効果が高レベルにて達成できる歯科ユニット用洗浄水供給装置を提供する。【解決手段】歯科ユニット用洗浄水供給装置は、洗浄水供給チューブ及びうがい用洗浄水の供給配管が各々分岐する給水分岐部と止水栓との間に着脱可能に設けられる液体処理ノズル1であって、一端に液体入口4を、他端に液体出口5を有する液体流路3が形成されたノズル本体2と、液体流路3の内面から各々突出するとともに外周面に周方向の山部と高流速部となる谷部とが複数交互に連なるように形成された衝突部8を有する処理コア部COREとを備えた液体処理ノズル1と、を有して構成される。【選択図】図2
