DE4111789A1 - Dust filter insert arrangement for filter materials of poor mechanical strength - in which each filter core incorporates support frame, filter sock and core cap which is spray joined to end of sock and frame - Google Patents

Abstract

A dust filter incorporates a support element upon which numerous filter cores are secured. The novelty is that each of the filter cores incorporates a support frame, a filter sock and a core cap, which is spray-joined to the end of the filter sock and the frame end. USE/ADVANTAGE - The arrangement permits the choice of material for the filter core irrespective of the mechanical strength of the material.

Description

The invention relates to a filter element according to the Oberbe handle of claim 1.

Such a filter element is in DE-OS 28 07 159 described.

The individual are attached to the support element Filter candles made of a self-supporting filter material produced. Such filter materials are suitable for use at temperatures that are not too high (in practice up to about 80 ° C) and not chemically aggressive for filtering, dry suspended solids, due to this property due to pressure backwashing easily from the filter material separate.

For some applications it would now be desirable to have a filter element available, with which the actual filter material with regard to use temperature, chemical resistance, pore size and disposal availability can be chosen more freely. Such filter material lien are available in the form of fabrics, fleeces, etc. bar. However, these materials are not self-supporting.

From DE-PS 32 38 783 a filter cartridge is also known in which a non-self-supporting filter stump over a perforated contactor body is arranged. The latter is carried by a filter head, and by a special trained seal and a special candle clamping head is the sealing of the filter sock against the support element receive. Such a candle structure is only with behaves large candle diameter possible: These well-known  Filter candles used for sugar filtration, have a diameter of 8 to 15 cm in practice. With such candle diameters, however, the filter is upper area based on the volume occupied by the candle small.

The present invention aims to provide a filter element be created according to the preamble of claim 1, in which the actual filter material regardless be chosen on its mechanical strength which has a high specific filter surface and where there are no sealing problems on the candle head.

According to the invention, this object is achieved by a filter element according to claim 1.

In the filter element according to the invention, the mate rial of the filter stump within wide limits according to the respective desired temperature resistance, pore size, chemical Durability, disposability, affinity for the filter cake etc. choose. Which acts on the filter material in operation forces are caused by the behind the filter stump lying support body reliably recorded. The support body has small, preferably flat transverse Cross-section, so that you have a high specific overall Filter surface (filter surface / taken from the candle menes volume).

In the present description, a small cross section should be used exercise should be understood as being so small that tight mechanical clamping of the filter sock end not according to the principle described in DE-PS 32 38 783 is more possible. In practice, this is with a scope less than 15 cm. Such small cross sections are fine in terms of high surface area per volume  worth it.

Would the top of the filter stocking and support body in a known manner with a rubber elastic Seal the seal, there would be sealing problems with the strongly curved surface sections. To get this out clear, there is a seal between the filter sock and candle head according to the invention by in situ Material. For this you can either use the filter sock glue or pour the support element or that Spray the support element directly onto the filter sock.

The small, preferably flat cross-sectional shape of the Support body leads to the fact that there is also a filter filter cake collecting heavily curved sections on which it is particularly easy with pressure surge backwashing begins to break. A fil terelement also for the separation of for caking inclining suspended matter can be used without the in Special rejection of the filter cake mechanical aids would be necessary or the filter should be opened.

To create a tight detachable connection to the filter element Manufacturing receiving filter housing will be a you device between the support element and the filter housing see. Here the seal does not need any sharp bends to show.

Advantageous developments of the invention are in Unter claims specified.

The development of the invention according to claim 2 is in With a view to simple machine production of the Sealing point at the end of the filter sock is an advantage. One can  in a filter element according to claim 2 also slightly Replace all or part of the filter cartridges. There the candle head has larger dimensions and also none must have sharply curved sealing surfaces, one can there a secure, releasable sealing point between the supporting element and ensure filter sock with a normal seal.

In principle, the support body can also be loosely inserted into the filter insert stocking. It also fulfills its task a radial collapse of the filter stocking during operation to prevent conditions. With such a filter element you can then remove the support body before throwing away the filter Remove the candle and reuse it or use a separate one Send for recycling.

The development of the invention according to claim 3, which the support body also firmly with the candle head is connected, such separate disposal the support body is not too, but is with regard to easy and quick handling of the individual Filter candle groups an advantage.

With the development of the invention according to claim 4 achieved that the candle head, which simultaneously a plurality of support bodies and filter stockings, larger size has, so that even lower demands on the Sealing point between filter head and support element will. The filter cartridges are also mounted on the support element facilitated.

The development of the invention according to claim 5 allows a particularly close stacking of the individual Support body and filter stockings and thus a high spec fish filter surface. It also ensures that the individual support body with mechanical change  loads such as z. B. in the pressure pulse backwash occur, move synchronously in the same direction, whereby relatively large vibration amplitudes at the bottom End possible. This is for good Detachment of the filter deposited on the filter sock cake is an advantage. Also with regard to one if possible vortex-free flow around the filter cartridges is the same orientation is an advantage.

The further development of the invention according to claim 6 is in terms of a tight packing of each Filter candles and with a view to easy mounting and removing the filter cartridges from the support element is advantageous. The specified shape of the candle head is forcing wise angular alignment of the twin candles and an advantage with regard to reliable sealing points.

With a filter element according to claim 7, one receives precisely specified sealing force inevitably when inserted the filter candle in the support element.

With a filter element according to claim 8 you only need a smaller number of connection openings to housing-fixed Provide connection openings.

The development of the invention according to claim 9 is again with a view to swinging the support body and filter stockings are an advantage when backwashing with pressure impulses. Due to the flat cross section of the individual support bodies is guaranteed that the swing of the different Support body takes place in the same direction, namely perpendicular to the large cross-sectional axis.

The development of the invention according to claim 10 in view of an inexpensive manufacture of the support  body beneficial.

A filter element according to claim 11 can also be found under use unfavorable environmental conditions for a long time.

The claims 12 to 16 give preferred training of the filter sock.

Closes the lower end of the filter sock according to Claim 17 with a separate end piece, this serves End piece at the same time as a stop at the lower end of the support body. There is therefore no danger that the lower one End of the filter stocking inside the support body is pulled.

The development of the invention according to claim 18 facilitates the handling of the filter carried by a support element candle set. This is also the movement of the lower filter candle ends synchronized.

With a filter element according to claim 19 you can Support body on the one hand from simple basic geometry assemble profiles inexpensive and variable. Since the individual profiles are also somewhat against each other can move, you get a further improved detachment the filter cake during pressure backwashing.

The development of the invention according to claim 20 is in With regard to favorable, vortex-free flow conditions beneficial for both filtration and backwashing.

The invention will now be described with reference to embodiments play explained with reference to the drawing. In this show:  

Figure 1 is a vertical section through a filter for separating solid suspended matter from gaseous media.

FIG. 2 shows an enlarged partial section through part of a filter drawer of the filter according to FIG. 1 (only partially fitted with candles);

Fig. 3 is a plan view of the drawer part of Fig. 2;

Fig. 4 is a view similar to Figure 2, but in which a modified filter drawer is given again.

FIG. 5 shows a top view of the drawer part according to FIG. 4; and

Fig. 6 is a view similar to Fig. 2, in which a further modified filter drawer is shown.

In Fig. 1, a housing 10 of a dust filter is shown, which is divided by a horizontal partition 12 into a working space 14 and an outlet space 16 .

The intermediate wall 12 carries a plurality of parallel arranged vertically aligned filter drawers 20 , the structure of which will be described in more detail later. The interior of the filter drawers 20 communicates with the outlet space 16 .

To the outlet chamber 16, a fan 20 is flanged, which draws gas from the outlet chamber 16 and delivers it to a clean gas line 24th

The gas to be cleaned, containing suspended solids, enters the working space 14 via an inlet connection 26, passes through the filter drawers 20 , on the filter material of which the suspended matter sticks, and is then pressed into the pure gas line 24 .

The retained on the filter drawer 20 Schweb materials there form a filter cake. This is replaced from time to time by pressure pulse backwashing. For this purpose, a compressed gas line 30 is connected to the outlet space 16 via a switching valve 28 .

The filter cakes 20 dropping when the interior of the filter drawer is pressurized pass through a funnel-shaped housing base 32 into a collecting container 34 .

As can be seen from FIG. 2, the filter drawers 20 each have a strip-shaped support element 36 which is injection molded from fiber-reinforced plastic. In the support element 36 successively in the longitudinal direction substantially square cross-section having graduated receptacles 38 are provided. In each of the receptacles 38 a candle head 40 is seated with a substantially complementary, stepped geometry. A sealing ring 42 , the cross section of which corresponds to a rectangle with a semicircle placed on the outside, seals the lower section of a receptacle 38 against the lower section of an associated candle head 40 .

In the candle head 40 , two further receptacles 44 are provided arranged parallel to one another, which are stepped, are separated by a wedge-shaped molded guide part 46 and each hold the end of a support body 48 . The support bodies 48 are injection molded from temperature-resistant plastic and have openings 50 . Their transverse cross-section corresponds to a lower rectangle.

A filter sock 52 is drawn over each of the support bodies 48 in such a way that it extends into the associated receptacle 44 or 46 .

The upper end of the filter stocking 52 is tightly connected to the candle head 40 in that the latter is glued, pointed, foamed or cast onto the two support body / filter stocking units.

The candle head 40 has seen in axial supervision in wesent union square shape with generously rounded corners, so that the sealing ring 42 is not strongly curved in any section and a reliable seal between the candle head 40 and the receptacle 38 is ensured everywhere.

In the filter drawer shown in FIG. 2, the filter material has to be replaced due to exhaustion, so only the filter candles, designated 54 in total, need to be pulled out of the supporting element 36 and replaced by new filter candles.

The filter drawer shown in FIG. 4 largely corresponds to the exemplary embodiment according to FIG. 2. Functionally equivalent parts are again provided with the same reference symbols and are not described in detail again.

In the filter drawer according to Fig. 2, only the filters are stockings 52 in the cartridge head 40 is injected or poured into. The support body 48 are inserted into the candle head / filter stocking unit. They can thus be easily pulled out of a filter candle when it is replaced and either reused or disposed of separately.

In addition, the support body each consist of two adjacent oval tubes 48 a and 48 b, so that the cross-section of the support body corresponds in total to approximately a lying eight. The constriction between the tubes 48 a and 48 b provides a further predetermined breaking point for the filter cake. A remaining mobility of the tubes 48 a and 48 b against each other also supports the filter cake detachment during the pressure surge backwashing of the filter candles.

Alternatively, the support body can also be a one-piece spray select part whose cross-section has the shape of an "8".

Furthermore, in the exemplary embodiment according to FIG. 4, the lower ends of the filter stockings 52 are closed by disk-shaped fixed end parts 56 which are glued or molded onto the lower end of the filter. So that the material of the filter stocking is not drawn with a sharp curvature over the lower end of the support body 48 when a larger pressure difference has to be absorbed on the filter stocking material. The pressure sock is only caught by filter sock material where it is flat and well supported. With such a candle training you can also use more sensitive materials for the filter stocking without the risk of damage.

In a modification of this exemplary embodiment, the end parts 56 can also be provided with downwardly projecting sections which are connected by a more or less flexible web or a strip in order to couple the lower candles more or less mechanically.

In the filter drawer shown in Fig. 6, the support member 36 is hollow and thus delimits a distribution chamber 58 which is only connected to corresponding housing-fixed connection openings of the outlet space 16 via a small number of outlet openings 60 .

For fluid-tight attachment of the support body 48 and the filter stockings 52 on the lower bottom 62 of the support member 36 , a continuous candle head is provided in the form of a casting layer. A sealing plate 64 serves to seal the upper side of the support element 36 against the outlet space 16 . Holes 66 , 68 shown in the left part of FIG. 6 serve as a passage for fastening means with which the support element 36 can be screwed tightly to the bottom wall of the outlet space 16 .

The material for the filter socks can be made from one large number of known fiber materials without Consideration of self-supporting properties like this looking for how this is cheapest for filtering each is. E.g. can one such fiber materials from the choose a standing, very wide group: polyethylene, Polypropylene, polyester, polyamide, polyacrylonitrile, aramids, Polyphenylene sulfides, polyimides, polyether ketones, polytetra fluorethylene, glass fibers, stainless steel fibers, ceramic fibers.

The filter stocking material can additionally with a Filter and / or support the filter cake detachment the equipment is provided, e.g. B. a hydrophobic, oleophobic, anti-electrostatic, or membrane equipment.

Claims (20)

1. Filter element, in particular for dust filters, with a support element ( 36 ) and at least one fluid tightly attached to this filter candle ( 54 ), characterized in that the filter candle ( 54 ) each have a small, preferably flat cross-section, radially stiff, openwork Support body ( 48 ) and a filter stock pushed onto this ( 52 ); and that the support element ( 36 ) with the ends of the filter stockings ( 52 ) glued or potted or molded onto the filter stocking ends. 2. Filter element according to claim 1, characterized in that the filter stocking ends are glued, potted or sprayed with candle heads ( 40 ) and that the candle heads ( 40 ) are each seated in a receptacle ( 44 , 46 ) of the support element ( 36 ) and by a seal ( 42 ) are sealed against this receptacle ( 44 , 46 ). 3. Filter element according to claim 2, characterized in that in each case the candle head ( 40 ) is also glued or potted to the end of the associated support body ( 48 ) or is molded onto this end. 4. Filter element according to claim 2 or 3, characterized in that the candle heads ( 40 ) each carry a plurality of support bodies ( 48 ) and associated filter stockings ( 52 ). 5. Filter element according to one of claims 1 to 4, characterized in that the cross-sectional axes of the support body ( 48 ) are aligned parallel to each other. 6. Filter element according to claim 4 or 5, characterized in that a candle head ( 40 ) each has two flat cross-sectional shape supporting body ( 48 ) and associated filter stockings ( 52 ) and has a substantially square cross-section with rounded corners. 7. Filter element according to one of claims 2 to 6, characterized in that a portion of the peripheral surface of the candle head ( 40 ) each carries the seal ( 42 ) and the inner surfaces of the receptacles ( 38 ) cooperate with the associated candle head seal ( 42 ). 8. Filter element according to one of claims 1 to 7, characterized in that the support element ( 36 ) delimits a distributor chamber ( 58 ). 9. Filter element according to one of claims 1 to 9, characterized in that the support body ( 48 ) are bendable in the direction perpendicular to the support body axis. 10. Filter element according to one of claims 1 to 9, characterized in that the support body ( 48 ) are extruded plastic parts. 11. Filter element according to one of claims 1 to 10, characterized in that the support body ( 48 ) made of temperature-resistant and / or corrosion-resistant material, for. B. stainless steel are made. 12. Filter element according to one of claims 1 to 11, characterized in that the filter sock ( 52 ) is made of a fabric or a nonwoven. 13. Filter element according to claim 12, characterized in  that the woven or non-woven fabric of fibers of the following Materials is manufactured: polyethylene, polypropylene, Polyester, polyamide, polyacrylonitrile, aramide, polyphenylene sulfides, polyimides, polyether ketones, polytetrafluoroethylene, Glass fibers, stainless steel fibers, ceramic fibers. 14. Filter element according to claim 12 or 13, characterized in that the filter sock ( 52 ) has a material to be separated repelling equipment, for. B. a hydrophobic, an oleophobic, an anti-electrostatic or a membrane finish. 15. Filter element according to one of claims 12 to 14, characterized in that the filter stocking ( 52 ) is a circular-needled or round-woven piece of material. 16. Filter element according to one of claims 12 to 14, characterized in that the filter sock ( 52 ) is made of a flat material web and is sewn, welded or glued along a surface line. 17. Filter element according to one of claims 1 to 16, characterized in that the filter stocking ( 52 ) is closed at the free end by a fixed end part ( 56 ). 18. Filter element according to claim 17, characterized in that that the fixed end parts of adjacent filter socks are molded onto each other. 19. Filter element according to one of claims 1 to 18, characterized in that the support body ( 48 ) each consist of a plurality of parallel support profiles lying parallel to one another ( 48 a, 48 b). 20. Filter element according to one of claims 4 to 19, characterized in that between the receptacles ( 44 ) for the ends of the filter stockings ( 52 ), a guide member ( 46 ) providing laminar flow conditions is arranged.