JP1746179S - underdrain - Google Patents

Abstract

This article is a lower water catchment device, and includes "reference enlarged lower perspective view 2 showing the name of each part omitted in the middle", "reference enlarged exploded view showing the name of each part omitted in the middle", "reference enlarged end view showing how to use ” and “Reference diagram showing how to use”, etc., among the multiple treatment processes for treating water to be treated such as river water, groundwater, and wastewater, the bottom of the sand filter basin for filtration or activated carbon adsorption It is arranged at the bottom of the pond, and a filtration layer made of granular materials such as gravel, sand, anthracite, etc. is placed on this product, and the filtered water flowing down from the filtration layer is evenly collected, and filtered during backwashing. Evenly distributing air and/or water in the bed cleans the sand filter basin. That is, at the time of water collection treatment, as shown by the arrows in the "reference enlarged end view showing usage" and "reference diagram showing usage", the filtered water flowing down from the filtration layer is pushed into the upper outer wall of the article It is taken into the side circulation part from the upper external inflow and outflow hole arranged in the inner wall body, and further taken into the central circulation part through the internal outflow and outflow hole arranged in the inner wall body. It is taken out from the fluid external connection part formed by cutting (constituted to be short in the longitudinal direction). During backwashing, water and/or air are taken into the central circulation portion through the external fluid connection portion, and taken into the side circulation portion through the internal inflow/outflow holes, as indicated by the same arrows in both figures. , the air and/or water evenly distributed through the upper outer inflow and outflow holes are ejected to the filter layer to remove foreign substances in the filter layer. In addition, a perforated plate is installed on the product as shown in "reference enlarged exploded view with middle omitted showing each part name", "reference enlarged lower exploded view with middle omitted" and "reference diagram showing how to use". It is also possible to use