| 摘要 |
<p>PURPOSE: To reduce the size over the entire part and to prevent water for cleaning from being discharged outside together with air by arranging a suction duct in a discharge duct and setting the air passage sectional area of the suction duct larger than the air passage sectional area of the suction duct. CONSTITUTION: Since the suction duct 10 is housed in the discharge duct 11, the size over the entire part is reduced and the smaller floor space is necessitated. The sectional area of the air passage part 15 of the discharge duct is larger than the sectional area of the air passage part 16 of the suction duct 10 and, therefore the flow velocity of the air in the discharge duct is lower and rising of water is no longer possible. As a result, the water is prevented from being discharged outside through the discharge duct 11. Since a tank 38 is hermetically closed, a negative pressure is generated in this tank 38 and water in a reservoir section 37 connected thereto is automatically recovered into a recovering section 42 when water in a supply section 44 is pumped up by a pump 39. Then, the constitution of the tank 38 and its periphery is simplified.</p> |
