DE8813131U1 - Two-chamber filter trough - Google Patents

Description

ti

1 I

Two-pot pilsner trough

The invention relates to a filter trough made of refractory material for liquid metals with a filter chamber, an inlet for the metal to be filtered, a filter insert arranged at the bottom of the filter chamber and an outlet for the filtered metal. Such a filter trough is known, for example, from US Pat. No. 4,081,371.

Filters of the aforementioned type are used, for example, to filter molten aluminum and gold, but also to filter liquid gray cast iron and steel. The filter inserts are preferably made of a ceramic foam of a known type, the material of which is tailored to the respective melting temperatures and the porosity to the respective intended use of the liquid metal.

Filter troughs of the aforementioned type are usually installed as an insert in a sheet metal container, which protects the fragile trough. In addition, insulation between the trough and the container ensures that heat loss is limited.

Filters of the known type do their job. However, there are still things to be desired. In particular, the filter trough should be as small as possible in relation to the desired flow volume. This increases handling and the risk of breakage and thus the service life. In addition, the filters made of fireproof bricks in the known manner according to the state of the art have leakage problems caused by gaps between the individual parts of the filter.

Accordingly, the invention is based on the object of creating a filter trough which is small and compact in relation to the flow volume and is also as light as possible and has a good filtering effect. The solution to the problem is specified in claim 1.

The one-piece design of the filter trough ensures that no leaks occur that could

-4-

liquid metal can escape” The walls can be made relatively thin so that the filter as a whole remains clean. The partition wall with downstream overflow chamber ensures a calm flow and thus ensures a uniform and good filter effect.

Further developments of the invention are the subject of the subclaims. The filter trough can have any cross-section in horizontal section, but a round or oval cross-section is particularly useful. The filter chamber is advantageously much larger in cross-section than the overflow chamber. This allows the filter insert to have a maximum flow area. It is advantageous if the filter insert has the shape of a circular disk with a missing segment and that the partition wall rests against the segment surface. This also enables optimal use of the filter cross-section.

In order to be able to drain the liquid metal in the filter after the end of a filtering process or in the event of a malfunction, it is advisable to arrange a drain at the bottom of the overflow chamber, which is closed off by a plug during filtering. At the inlet and outlet and, if necessary, at the outlet, it is advantageous to form gutter attachments or pipe sockets onto the filter trough.

The invention is described below with reference to the drawings in conjunction with an embodiment. They show:

Fig. 1 is a vertical central section through a filter trough according to the invention;

Fig. 2 is a side view of the filter trough according to Fig. 1;

Fig. 3 is a top view of the filter trough according to Fig. 1 and 2.

The filter trough shown in the figures has a filter chamber 1 and an overflow chamber 2 3üf. A filter insert 3 is arranged at the bottom of the filter chamber 1, which is designed to be replaceable in a known manner and is sealed against the surrounding walls in a known manner. Example-

Ceramic fiber material is often used for this purpose.

The liquid metal flows through in the direction of the arrows shown in Fig. 1. An inlet channel 4 is formed on the inlet side and an outlet channel 5 is formed on the outlet side of the trough. A drain connection 6 is located at the bottom of the overflow chamber 2 and enables the filter to be emptied. When the filter is in operation, the drain connection is closed with a plug (not shown). The filter chamber 1 and the overflow chamber 2 are separated from one another by a partition wall 7, which forms a boundary for the filter insert 3 at the lower edge, which has the shape of a circular disk, but is segment-shaped in the area of the partition wall 7.
All parts of the filter trough shown with

The filter insert 3 and its parts form a single piece of ceramic material. During production, individual parts, such as the attached channels and nozzles 4, 5, 6, the walls of the trough and the partition wall 7, are made separately from ceramic material and then assembled. Before firing, the parts are joined together by applying a ceramic mass so that after firing, a single-piece trough is produced.

The inlet and outlet channels 4, 5 do not have to be offset by 180° from one another, as shown in Fig. 3. It is sufficient if the respective channel opens into its chamber 1 or 2. The same applies to the nozzle 6.

Filter troughs according to the invention can, depending on the

- desired flow volume can be manufactured in different sizes, for example with a height between 200 and 350 mm (without restriction) and a cross-section between 300 and 250 mm ² (without restriction).

Claims (6)

Protection claims 1. Filter trough made of refractory material for liquid metals with a filter chamber (1), an inlet (4) for the metal to be filtered, a filter insert (3) arranged at the bottom of the filter chamber (1) and an outlet (5) for the filtered metal, characterized in that the filter chamber (1) is followed by an overflow chamber (2) which is separated from the filter chamber (1) by a wall (7) extending to the filter insert (3), is connected to the space below the filter insert (3) and contains the outlet (5) at the upper edge, and that the filter trough and preferably also the partition wall (7) are formed in one piece. 2. Filter trough according to claim 1, characterized in that the filter trough has a round or oval cross-section in the horizontal section. 3. Filter trough according to claim 1 or 2, dlcharacterized in that the filter chamber (1) is substantially larger in cross-section than the overflow chamber (2). 4. Filter trough according to claim 2 and 3, characterized in that the filter insert (3) has the shape of a circular disk which is missing a segment, and that the partition wall (7) rests against the segment surface. SonrHMbffpr penalty 43 0300WlMMdM TiMfM OBf21WQO 91. TiI* 4190237: TMfM 06121 -M 72 OS Tt WOO MOAdMfI 00 Tttttai CtBtJM 3« 03 .*&Ggr;#(&Lgr;&Bgr;&bgr;&idiagr;&Lgr;&idiagr;3&idiagr;&Tgr;·&Mgr;«0&bgr;&bgr;·8 34 4&bgr; 18 T«Mgf*fflffw •t • I I I -2- 5. Filter trough according to one of claims 1 to 4, characterized in that a drain (6) for the liquid metal is arranged at the bottom of the overflow chamber (2). 6. Filter trough according to one of claims 1 to 5, characterized in that channel attachments (4, 5, 6) or pipe sockets are formed on the filter trough at the inlet and outlet and optionally at the outlet.