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Backwashable filter device having means to add additional fluids to filtrate backwash fluid
| Details |
Inventors: Seibel, Heinrich; Hermann, Rudi; Siller, Rudi;
Assignee: Intek Handels-GmbH fur Innovationstechnische Produkte (Ludwigshafen, DE)
Primary Examiner: Drodge; Joseph W.
Assistant Examiner:
Attorney, Agent or Firm: Dubno; Herbert
The invention concerns a backwashable filter device, specially for domestic water conduits that includes an inlet for raw water, a raw water chamber connected to the inlet, an outlet for clean water, a clean water chamber connected to the outlet, a filter element and an outlet for backwash water. The filter element is arranged between the raw water chamber and the clean water chamber and features a partial area (B) that accommodates water flow only in backwash but not normal operation. A conduit channel connects the outlet for backwash water with the partial area (B). At least one separate conduit connection is provided from the clean water chamber to the partial area (B). A conduit area is present in the conduit connection and designed in a nozzle-like shape so that clean water can be conducted from the clean water chamber at increased velocity against the partial area (B). |
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DETAILED DESCRIPTION The filter device 10 shown in FIGS.
1 to 3 has a pipe connection part 12, which is connected with its two pipe connections 14, 16, to a not shown liquid line, e.
g.
a domestic water supply line.
The raw water enters through the top pipe connection shown in the drawing in the pipe connection part 12, flows then through the filter device, in which the impurities are removed, and is returned then as clean water through the bottom pipe connection shown in the drawing to the conduit system.
This direction of flow is indicated by the arrow included in FIG.
1.
In this operating condition, the filter device 10 operates in the so-called normal operation.
A casing part 18 is fastened by means of a clamping ring 20 to the pipe connection part 12.
This clamping ring 20 is screwed to the pipe connection part 12 and presses the casing part 18 tightly and liquid-proof against said pipe connection part 12.
A raw water chamber 22 is centrically arranged in the casing part 18 and pipe-connected to the pipe connection 14.
The raw water chamber 22 is surrounded by a filter element 24 designed as annular disk.
The raw water chamber is provided with side openings 26, through which the raw water in the raw water chamber 22 can be diverted on the outside and flow--in FIG.
1--from right to left through the filter element 24.
The filter element 24, which consists of one or several layers of fine-meshed wire cloth, rests in flow direction on a support 28, which has a perforated surface 29 in its areas in contact with the filter element 24, so that the clean water which has passed through the filter element 24 can flow through the support 28.
The clean water flows from the area of the support 28 into an annular chamber 30, which is pipe-connected to the pipe connection 16.
This flow possibility beyond the filter element 24 takes place in an area A (FIG.
3) of the filter element 24, which covers almost all its surface.
In the remaining area B (FIG.
3), no raw water can flow through the filter element 24 in normal operation, as a channel section 34 rests in this area B directly on the rear side of the filter element 24
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