DE9203474U1 - Suspended matter filter system - Google Patents

Description

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The invention relates primarily to exhaust air and exhaust gas filter systems for industrial use and to the use of cleanable particulate filter cells - the latter at least on the working filter.

State of the art:

Conventional filter systems usually consist of individual housings. But these are housings in which the working filters are located together with the cleaning technology and those in which the safety filters are located alone. If the latter are omitted, the housing required for this is usually omitted or saved. Retrofitting later is expensive - or is no longer possible at all. The pipes carrying the exhaust gas are usually installed externally and the individual filter chambers are connected via individual lines. The same applies to the clean gas. The raw gas lines are usually connected to the dust collection chambers, from which the working filters are supplied with air. Both housings - the one for the working filters and the one for the safety filters - each require its own access opening.

A typical filter system of the type described is shown in Fig. 3 .

Cleanable filter cells, as used in filter systems of Fig.3 and in the proposed housing technology, are described in G 89 10 110.3 and G 89 15 110.0 .

Object of the invention

is to create a filter housing that can be used both on its own - i.e. for a small filter system - and for assembling a large system from such individual systems (individual housings)

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suitable and which accommodates all the essential functional parts of a suspended matter filter system with cleanable suspended matter filters, with cleaning technology, and with safety filters (police filters). It was also desired to place such a filter system directly against a wall and to only need one access opening or only one door per individual housing to access the working filters, the cleaning technology, and the safety filters. The housings should allow relatively inexpensive retrofitting with safety filters without great effort and overall - as far as putting together a large filter system is concerned - be more economical than conventional technology.

The solution is achieved

by assembling a large filter system (1) from individual filter systems, whereby each such individual filter system can accommodate all its functional parts in a single filter housing (2), which in the front part of the filter housing provides the filter chamber (2.1) - with its air flow from bottom to top and the space for the working filter cells (6), the cleaning unit (7), and safety filter cells (9), as well as a supply channel or downdraft channel (2.2) for the raw gas between the two rear walls (5) and (5.1) in the back part of the filter housing (2). This means that individual connections of pipes to the dust collection chambers (3) can be dispensed with. In addition to costs, this also saves valuable space.

By placing the filter housing (2) on a dust collection chamber (3), a space is formed together with the dust collection chamber and the downdraft channel (2.2), which, in addition to its nominal function, also serves as a deflection space for the exhaust gas flowing into the dust collection chamber (3) from top to bottom, and from which the filter chamber (2.1) is flowed from bottom to top. The desired properties are achieved in particular by

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the safety filter cell(s) (9) suspended under the outlet surface (8) of the filter housing (2.1) and thus by dispensing with a separate housing and a second access opening (13), as well as by constructing the filter housing (2) in individual walls, floors and cover plates using screw technology.

Further advantages beyond the intended advantages arise from the possibility of designing the side walls (1.1) of the filter housings open in the area of the downdraft channel (2.2), so that by screwing the filter housings (2) together, a longitudinal channel is created as the sum of all the downdraft channels (2.2), which serves to supply exhaust gas to the individual filter chambers (2.1) and which makes an external channel (a pipe) and the required branch lines superfluous at the lowest possible cost.

The relocation of the shut-off device (2.3) for the exhaust gas to the floor level (10) of the downdraft channel also allows the device to be designed as a flow baffle.

In the design presented here, a discharge channel for the clean gas (14) can be mounted directly on the outlet level of the filter housing (2), which eliminates the need for an external channel (pipe) and individual connections. In this case, too, the clean gas shut-off devices (15) can be mounted in or on the filter housing.

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shows in one embodiment a filter system (1) of the type presented with a total of six filter housings (2), where in each of these filter housings (2) there is space for, for example, 2 working filter cells (6) and a safety filter cell (9).

Fig.2 and Fiq.l

show the filter housing (2), several of which, when put together and provided with dust collection chambers or funnels (3), form a more or less large filter system, as shown as an example in Fig . 1. The filter chamber (2.1) - that is the front part of the filter housing (2) - is formed by the inner rear wall (5.1), the lower floor (10), the front level (13) or door (13.1), the upper floor (8) and the side walls (11), the downdraft channel (2.2) at the back of the filter chamber (2.1) by the rear wall (5) and the inner rear wall (5.1) as well as the side walls (11).

In the case of a small filter system - it then only consists of a filter housing (2) and a dust collection chamber (3) - the exhaust gas is led into the downdraft channel (2.2) via the top opening (4) or via a side opening (4.1) or rear opening (4.2).

From there, the exhaust gas flows through the open shut-off device (2.3) into the dust collection chamber (3), where it is diverted upwards to flow from there through the working filter cells (6), where the dust collects in their dust collection pockets. The working filter cells (6) are mounted on the clamping base (lO). The cleaning unit (7) is located above the filter cell(s) (6). In the example shown, it is a hoseless pneumatic blow-off unit running above it.

The safety filter cell (9) is attached below the upper chamber floor (8). Access to the filter chamber (2.1) is

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through an opening in the wall (13) and via door/lid (13.1).

In a filter system consisting of several filter housings (2) (1), the side walls (11) in the area of the respective downdraft channels (2.2) are omitted. A pipe connection (12.1) is created on the side of the filter system (1) - see Fig. 1 - or on the top of the system, so that the exhaust air/exhaust gas from a pipe can flow into the longitudinal channel (12) formed within the filter system and supply the individual filter chambers (2.1) via the flaps (2.3). The housings are usually mounted on mounting feet (16). As a rule, the dust is thrown into the dust collection containers (3.1) during each cleaning.

A clean gas channel (14), which can be mounted on the filter system (1), leads away the cleaned gas (air). The clean gas shut-off devices (15) serve to separate individual filter chambers (2.1) from the entire filter system (1).

Fig. 3

shows a conventional filter system of the same size as the one in Fig.l :

with filter chambers (1) for the working filter cell(s) (6) here for 2 pieces per chamber and the cleaning unit (7), with filter chambers (2) for one safety filter cell each (8), with dust collection chambers (3) and dust collection containers (3.1), with the raw gas line (4), the outlets (4.1) and the raw gas shut-off valves (4. 2), with the clean gas pipeline (5) and the individual pipes (5.1), and the clean gas shut-off valves (5.2), as well as with the feet (9).

Claims (7)

-2- Claims: 1. HEPA filter system with cleanable working filter cells - and space for the HEPA filter cell(s) as safety or police filters - made of cubic filter housings constructed using single-wall screw technology and mounted in series, each with a rectangular downdraft channel for uncleaned exhaust gas formed between their two rear walls and in the front part of the housing (filter chamber) on its lower boundary surface the mounting base for the cleanable HEPA filter cell(s), above it space for the cleaning technology, and on its upper boundary surface indirectly or directly offering a mounting frame for the safety filter cell(s) to be mounted at the top of the filter chamber, such that that the working filter cell(s) and the safety filter cell(s) are horizontally mounted filter cells of the HEPA filter cell type, that the lower floor of the filter chamber offers open mounting and flow surfaces for the inflow surfaces of the HEPA filter cell(s) mounted on it or the upper floor offers open surfaces for the outflow from the HEPA filter(s) mounted below it (&eegr;), that the working filter cell(s) is/ are mounted at the bottom of the housing and the safety filter cell(s) is/are mounted hanging at the top of the housing, that the dust collection chamber mounted under a housing collects the exhaust gas flow from the downdraft channel of the housing and redirects it upwards, that each of these individual filter housings, together with the dust collection chamber mounted underneath it and the shut-off devices on the raw gas side and the clean gas side, can represent an independent micro-filter system that can be switched off from the large filter system, that each filter housing has an operating opening with a door or cover on its operating side (front side), i.e. on the side facing away from the integrated downdraft channel. 2. Suspended matter filter system according to claim 1 such that that the cubic filter housings can be constructed as a welded construction instead of using screw technology. 3. Suspended matter filter system according to claim 1 and 2 such that that if the side walls in the area of the downdraft channel of the individual cubic filter housings are omitted, by screwing several filter housings together, a longitudinal exhaust gas channel is created that runs across all filter housings and is thus integrated into the filter system, via which the individual filter housings can be supplied with the dust-carrying exhaust gas (exhaust air). 4. Suspended matter filter system according to claims 1 to 3 such that that a raw gas shut-off device - preferably a flap - is installed in the rear downstream channel of the filter housings for each housing, which enables the associated dust collection chamber and the filter chamber to be shut off from the exhaust gas flow. 5. Suspended matter filter system according to claims 1 to 4 such that that the dust collection chamber under each filter housing can also be designed other than as a funnel. -4- 6. Suspended matter filter system according to claim 1 such that that more than one filter housing can be mounted on a common dust collection chamber. 7. Suspended matter filter system according to claim 1 and 2 such that that a channel with a rectangular flow cross-section is mounted above the system created by assembling the individual filter housings to remove the cleaned exhaust gas, and that each of the filter chambers can be separated from this channel by means of a shut-off device.