SE521922C2 - Filter cartridge suitable for use in the outlet of a centrifugal separator - Google Patents

Description

521 922 2 a central pipe arranged in the cyclone separator, which directs the gas out of the cyclone separator and to the outside of a filter cartridge, through which the gas is passed. Among other things, the central pipe also has the task of protecting the filter against coarser particles and other material, which with the treated gas is introduced into the cyclone separator and which can damage the filter. This protective effect causes the central pipe to be subjected to wear and deformation, which can cause most of it to be replaced or repaired. Furthermore, the central tube can lead to a certain limitation of the design of the centrifugal separator and the filter.

The filter cartridge and cyclone separator of this type are often used for separating gas, preferably air, from hazardous material, which can consist of large amounts of fine dust. Hazardous particles, e.g. of quartz, asbestos, etc., often with a size below 5 microns, can be very light and float in the air for a long time. For the operator, who changes filters, this can be a major health problem. It is therefore of great importance that the operator can change filters with the least possible turbulence of dust when changing the filter. The invention also enables a solution of this problem.

According to the invention, it has been found possible to dispense with or supplement the use of a central tube in such filter devices by providing a filter cartridge equipped with a filter material, preferably in pleated form, such as a filter body in the form of a filter layer or filter sheet, with a filter cartridge and with this replaceable jacket, which can completely or partially take over the function of the central pipe.

A filter cartridge according to the invention is shown in perspective view in Figure 1 and in a section in Figure 2. Figure 3 shows a sketch of a section perpendicular to the axial direction through the filter cartridge placed in a cyclone separator indicated by dashed lines.

A FILTER ~ 41DOC.dOC 521 922 3 A second embodiment of the invention, according to which the filter body is divided into two or more filter body parts is shown in Figures 4,5,6,7,8 and 9.

An embodiment which combines the two first-mentioned embodiments is shown in Figures 10 and 11.

Figures 12 and 13 show a further embodiment with a pre-filter, which can be combined with the previously mentioned embodiments.

Figure 14 shows an embodiment with the filter bodies arranged as a filter body group.

Figures 15 and 16 show an embodiment with a filter body with a cross-sectional shape, which deviates from a circular shape and which can be combined with the above-mentioned embodiments.

According to the embodiment shown in Figures 1-3, the invention comprises a filter cartridge 1 with a filter body 22 in the form of a pleated filter layer 2, which enables separation of solid and / or liquid material from a fluid, which is caused to pass the filter cartridge from its outside to its inside.

The filter cartridge further comprises a jacket 3 arranged at the outside of the filter cartridge next to at least a part of the filter layer spaced therefrom, the filter body (filter layer) and the jacket according to the embodiment shown being connected to a filter end 4, with which the filter unit can be mounted in a filter housing. shown in the figure, but which may be of the type shown in the above-mentioned SE 8202223-7. The filter cartridge can e.g. be arranged in an elastic membrane attached to the outer sheath of the centrifugal separator, e.g. as set forth in the aforementioned patent. At the bottom end of the filter cartridge a bottom end 7 is arranged. The sketchy section of Figure 3 shows in broken lines a centrifugal separator housing with outer jacket 8 with a tangential inlet 9 for gas to be purified, indicated by an arrow 10.

The jacket is suitably made of a permeable material, preferably porous material, in particular a filter material, preferably the same material which forms the filter layer of the filter body, for a filtered medium. It is also suitable that the jacket is made of an elastically resilient material, e.g. a material which can pass larger particles, such as stones and the like, which does not fit between the outer jacket of the cyclone and the jacket of the filter cartridge.

The pleated filter layer of the filter body preferably has a substantially cylindrical or conical shape (including also a pyramidal shape or other tapered shape and a truncated such shape), preferably with substantially parallel or straight or helical folds (5) which preferably extend substantially in the longitudinal or axial direction of the cylinder or cone. essentially towards the top of the cone. The jacket surrounds at least a part of the filter body (or the filter bodies or the filter body group if such a variant is used) calculated in its radial direction (circumferential direction) and / or axial direction (longitudinal direction), preferably at an angle between the filter body (filter layer) and the jacket of 0 to 30 degrees.

The jacket may suitably extend around the entire circumference of the filter body (respectively the bodies or body group) from one axial end thereof, preferably from that end, the connecting end, where the filter cartridge is sealingly connected to an opening in a filter housing, and preferably along at least 25%. at least 50% or at least 75% of, or the axial extent of the entire filter body etc (filter layer).

The jacket is preferably cylindrical or conical, tapering or widened from the connection end or filter end, the shape of the jacket preferably being congruent with the shape of the filter body (filter bodies or filter body group), i.e. preferably the shape of the filter layer or having a relative to the filter body A: ~ 41lDOC.dOC 521 922 5 extended widened shape, so that a widened gap 6 between them from the filter end is obtained.

A further embodiment of the invention comprises a particularly efficient and space-saving design of a pleated filter.

In order to obtain a good degree of separation, especially for a longer period of time, the filter surface should be adapted to the actual fluid flow, ie. preferably the gas flow.

Filter loads of max. 100 m3 / m2h air is common. To improve service life and separation, it is desirable to reduce this value by increasing the filter surface, resulting in less pressure loss and better separation. A pleated filter provides a large filter surface, but certain materials can cause clogging or jamming in the folds when separated. In particular, the lower filter end is a mechanical obstacle for the dust cake that falls off because a pocket is formed between the bottom end and the filter folds.

According to an embodiment of the invention, an improved filter with filter body of folded filter layer is provided by dividing the filter body into at least two filter body parts, a first, outer filter body part being arranged surrounding or enclosing a second or more inner filter body parts.

This is exemplified e.g. on the accompanying drawing figures 4,5,6,7,8 and 9.

This embodiment thus comprises a filter cartridge with a filter body of a pleated filter layer, which enables separation of solid and / or liquid material from a fluid flowing through the filter layer from the outside to its inside, the filter cartridge being characterized in that the filter body comprises at least two filter bodies, , preferably having a substantially cylindrical or conical shape, these filter body parts being arranged with an inner filter body part 22b completely or partially enclosed by an outer filter body part 22a, these filter body parts being sealingly connected to each other at their one end and at their other end between the insides of the filter body parts form a gap 26 for the escape of filtered fluid which has passed through the filter body parts from the outside thereof, as indicated by arrows 28.

In the filter cartridge according to this embodiment, the filter body parts may be formed by a continuous filter layer sheet, which is folded and bent to form two or more at one or more bending lines or one or more bending areas 29 of the sheet connected filter layer parts, preferably so that fold peaks resp. fold valleys of one filter layer part (filter body part) are continuously transient in peaks resp. valleys of an adjoining second filter layer portion (filter body portion). Instead of a continuous bent filter sheet, the filter body parts (filter layer parts) 22a, 22b, etc. can be formed by separate, by e.g. filter layer sheets designed, filter layer parts, which at one end are sealingly joined together, e.g. by gluing, etc.

The filter cartridge may also comprise a filter body made up of three or more filter body parts arranged inside each other, such as a filter layer divided into three or more filter layer parts arranged inside each other, which are sealingly connected to each other, e.g. along two or more bending lines or bending areas formed in a coherent filter layer material, or as separate parts, which are joined sealingly together, e.g. by gluing at the ends.

Figure 6 also shows an upper end 24 and a bottom end 27, which connect to the filter body part 22a resp. 22b, e.g. with A: \ FILTER ~ 4lDOC.dOC 521 922 7 glue joints 30 resp. Figure 6 also shows an annular part 32, which may be a jacket or a central tube.

A filter cartridge according to the invention may comprise filter body parts which are arranged concentrically and / or congruently in relation to each other, preferably with a common longitudinal axis line 30, preferably with substantially the same or on average with at most 50% or at most 75% mutually varying longitudinal extent in axial direction .

As shown in Figures 10 and 11, a filter cartridge according to the invention may have a combination of the two above-mentioned embodiments, i.e. characterized in that it comprises a filter body divided into two or more filter bodies parts 22a, 22b and a jacket 3 arranged outside the filter layers.

Figure 12 shows a filter cartridge, which is surrounded by a pre-filter 32, which e.g. may have the task of separating coarser particles, which may clog the inner filter body parts 22a, 22b. The pre-filter can be selected from a variety of different materials, e.g. reticulated, preferably flexible materials. The pre-filter can e.g. consists of a flexible filter passage, which is attached to the outside of the jacket 3, if used, or to the outside of the filter body or filter end and which is held extended towards the filter folds, as indicated in Figure 13, which is a subsection through the filter folds 2 and the pre-filter 32.

Figure 14 shows a filter cartridge comprising a plurality of frustoconically shaped filter bodies 22 arranged on a common end 4 such as a filter body group 122. The filter bodies are optionally designed as indicated above with a filter body divided into two or more filter body parts. This filter cartridge can e.g. be used as a filter cassette in ventilation systems, e.g. for housing, offices, industrial premises, means of communication, etc. and provides a large filter area in a small cassette without a support basket, support elements or the like between the folds or the like.

A: \ FILTER ~ 4lDOC.dOC 521 922 8 Figures 15 and 16 show a filter body 22 of pleated filter material, which in cross section has a shape which is substantially square with rounded corners forming circular arc segments.

In general, the filter body can have a variety of oval, cross-sectional shapes, usually e.g. circular, polygonal, e.g. triangular, quadrangular, such as rectangular, square, hexagonal, etc.

The jacket and / or filter material can advantageously also be made antistatic. This can be achieved by electrically conducting the jacket or filter material, e.g. by coating or incorporating antistatic agents, electrically conductive particles, e.g. metal wires or the like, whereby one should at the same time ensure that the jacket resp. the filter is connected or grounded in a suitable way, e.g. connected to a metal filter housing. The antistatic properties should be sufficient to prevent the occurrence of electrical discharges which may occur in the presence of certain solids or liquids in the filtered fluid during its flow and which may damage the equipment, cause noise, risk to personnel or explosion and fire .

A: \ FILTER ~ 4lDOC.dOC

Claims (14)

f 521 922 in ä 'Patent claim A filter cartridge (1), suitable for use in the outlet of a centrifugal separator, having one or more filter bodies (22) comprising a pleated layered or sheet-shaped filter material, which enables the separation of solid and / or liquid materials from a fluid , which is caused to pass the filter body or bodies from its outside to its inside, characterized in that the filter cartridge comprises a jacket (3) arranged at the outside of the filter cartridge next to at least a part of the filter body or filter bodies at intervals thereof, wherein the filter body or the filter bodies and the jacket are connected to a filter end (4), with which the filter cartridge can be fitted in a filter housing in a centrifugal separator, the jacket extending around the entire circumference of the filter body or the filter bodies from the filter end (4) and surrounding at least a part of the axial extent of the filter body or filters from the filter end. Filter cartridge according to claim 1, characterized in that the jacket is made of an elastically resilient, preferably permeable or porous material for a filtered fluid, in particular the same material which forms the filter body or filter bodies. Filter cartridge according to claim 1 or 2, characterized in that the pleated filter material forms one or more filter bodies connected to the same end, possibly forming a filter body group (122), which has a substantially cylindrical or conical shape, e.g. with mainly circular, elliptical or polygonal, e.g. rectangular or square cross-sectional shape, e.g. the shape of a polygon with straight sides connecting to each other with curved, e.g. circular cup segment-shaped connecting parts, and with substantially parallel or towards the same point, substantially straight folds (5), extending in the longitudinal or axial direction of the cylinder or cone 521 922, / Ö respectively towards the top of the cone, the angle between the surface filter material body and the jacket is preferably 0 to 30 degrees. Filter cartridge according to one of the preceding claims, characterized in that the jacket extends around the entire circumference of the filter body or group of filter bodies from one axial end thereof along at least 25%, at least 50% or at least 75% of, or the whole of the filter body. or the axial extent of the filter body group. Filter cartridge according to one of the preceding claims, characterized in that the jacket has a substantially cylindrical shape or a substantially conical shape which tapers or widens from the filter end, the shape of the jacket possibly being congruent with the shape of the filter body or group of filter bodies. Filter cartridge with at least one pleated filter material, which enables the separation of solid and / or liquid material from a gaseous or liquid fluid flowing through the filter material from its outside to its inside, characterized in that the pleated filter material forms or forms part of one or more filter bodies (22), optionally in a group (122) of filter bodies, the filter body resp. the bodies comprise at least two filter body parts (22a, 22b), preferably with a substantially cylindrical or conical, such as frustoconical, shape, and preferably with a substantially circular, elliptical or polygonal, cross-sectional shape, e.g. rectangular or square cross-sectional shape, e.g. the shape of a polygon with straight sides connecting to each other with curved, e.g. circular arc segment-shaped connecting parts, and preferably with substantially parallel or towards substantially the same point, substantially straight folds (5), which preferably extend in the longitudinal or axis direction of the cylinder or cone and towards the top of the cone, respectively, these filter body parts being provided with a first, outer filter body part (22a) completely or 521 922 ???? 1 / partially enclosing an inner filter body portion (22b), a filter body portion being sealingly connected to an adjacent, outer or inner filter body portion at at least one end (29) and internally forming a flow path (26) for escaping filtered fluid passing through the filter body portions from the outside thereof, and wherein a jacket according to any one of the preceding claims may be arranged on the filter cartridge. A filter cartridge according to claim 6, in which the filter material forms a group of filter bodies, which are arranged next to each other as a group (122), e.g. forming a substantially flat disc of filter bodies, and wherein the jacket, if used, surrounds at least a part of the filter body and the filter bodies and the group of filter bodies, respectively. Filter cartridge according to claim 6 or 7, characterized in that the filter body parts are formed by a continuous filter sheet, which is folded and bent to form at least two filter parts connected at least one bending line (29) of the sheet, preferably so that fold peaks resp. fold valleys of one filter body part (22a) are continuously transient in peaks resp. valleys of an adjoining second filter body portion (22b). Filter cartridge according to any one of claims 6-9, characterized in that the filter sheet is divided into three or more filter body parts arranged inside each other, which are sealingly connected to each other, preferably along two or more bending lines or bending areas formed in a continuous filter sheet material. Filter cartridge according to one of Claims 6 to 9, characterized in that the filter body parts are arranged concentrically and / or congruently in relation to one another, preferably with a common longitudinal axis (30), preferably with substantially the same or on average with i, 521 922 / -3._ not more than 50% direction. mutually varying length extension in axial Filter cartridge according to one or more of claims 1-5 in combination with one or more of claims 6-10, characterized in that it comprises a filter body of a pleated filter material divided into two or more filter body parts (22a, 22b) and an outside filter body arranged jacket (3). A filter cartridge according to any one of the preceding claims, that it is designed to cooperate with or (32), arranged to be passed by at least the main part of a genome thereof, is provided with a pre-filter e.g. a filter bag, which is the filter cartridge flowing medium, which is subjected to filtration. Filter cartridge according to any one of the preceding claims, characterized in that it comprises a first, (22a), direction away from the filter end, (22a) which is tapered in the same direction as but in smaller outer filter body part which is cylindrical or tapered in an inside the outer filter body portion arranged second, inner filter body portion (22a), degree greater than the first filter body portion, or is cylindrical or tapered toward the filter end, and optionally a third, or more, inner, consecutive filter body portions, the filter body portions having a tapered degree or direction, including cylindrical shape, which deviates from the degree of narrowing or direction of an adjacent filter body part, the filter body parts being preferably arranged concentrically around a common longitudinal axis line (30). Use of a filter cartridge according to any one of the preceding claims for separating liquid and / or solid constituents from a gaseous or liquid material stream containing these solid and / or liquid constituents.