JPS6394510U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the moving bed sand filter of the present invention, Fig. 2 is a sectional view of its internal fittings, and Fig. 3 is an enlarged sectional view of the upper end of the support tube. FIG. 4 is a sectional view of the filter sand separator portion. DESCRIPTION OF SYMBOLS 1... Can body, 1b... Filtrate extraction pipe, 2... Stock solution supply pipe, 3... Support pipe, 3b... Lower distribution plate, 4... Filter sand lift pipe, 5... Air supply pipe, 6... Filter sand separator, 7 ...Aperture plate, 8...Overflow pipe.

Claims (1)

[Scope of utility model registration request] A cylindrical can housing a filter sand layer, a stock solution supply pipe provided at the lower part of the cylindrical can so as to open into the filter sand layer, and a filtrate extraction pipe connected to the upper part of the cylindrical can, A support tube provided along the center of the cylindrical can body and having a downward conical lower distribution plate fixed to a position below the filter sand layer and an upper distribution plate fixed to a position higher than the filter sand layer; a filter sand lift tube inserted and fixed into the support tube so as to be located near the bottom of the filter sand layer;
an air supply pipe provided to open inside the lower end of the filter sand lift pipe; a filter sand separator provided at the top of the cylindrical can surrounding the upper end of the filter sand lift pipe;
A filter sand return pipe concentrically surrounding the filter sand lift pipe and connected to the bottom of the filter sand separator; and a washing liquid discharge pipe connected to the filter sand separator. A moving bed type sand filter characterized in that an overflow pipe is connected to an upper end of the support tube to communicate the space between the support tube and the sand filter lift tube with the space inside the filter sand separator.