APPARATUS TO PREVENT BAD SMELL AND FLOWING BACKWARD FOR MANHOLE

摘要

The present invention is to provide an opening and closing device for a manhole, which is a relatively simple structure for the unit cost of production to be low and prevents only backdraught of a bad smell generated in a lower portion of sewerage. To achieve this, according to the present invention, an opening and closing device for a manhole, which is installed in a lower end of a manhole cover to block a bad smell generated in a manhole, comprises: a guide unit attached to a lower end of the manhole cover to guide wastewater flowing through the manhole cover; a discharge pipe attached to a lower end of the guide unit to discharge wastewater flowing through the guide unit to a lower portion; and a rotor rotationally fixated on a fixing axis crossing the discharge pipe for the center of gravity to be placed on a lower end of the fixing axis.