WO2015082041A1

WO2015082041A1 - Filter device, in particular in the form of an air filter device

Info

Publication number: WO2015082041A1
Application number: PCT/EP2014/003053
Authority: WO
Inventors: Johann WALGER; Marco Bautz
Original assignee: Rt-Filtertechnik Gmbh
Priority date: 2013-12-05
Filing date: 2014-11-14
Publication date: 2015-06-11
Also published as: DE102013020653A1

Abstract

Filter device, in particular in the form of an air filter device The invention relates to a filter device, in particular in the form of an air filter device, preferably for filtering cabin air in working machines, comprising an accommodating housing (1) for accommodating individual filter apparatuses (23, 25, 27), which interact with a sealing apparatus (29), which enables mutual sealing of the filter apparatuses (23, 25, 27) among each other and/or with the accommodating housing (1). The filter device is characterized in that a guiding apparatus (33, 39, 41, 43) is present, which brings the particular filter apparatus (23, 25, 27) from an unsealed position to a sealed position along a specifiable guiding path (43) when the particular filter device is inserted into the functional position of the particular filter device within the accommodating housing (1).

Description

Filter device, in particular in the form of an air filter device

The invention relates to a filter device, in particular in the form of an air filter device, preferably for filtering cabin air in work machines, with a receiving housing for receiving individual filter devices which cooperate with a sealing device, which allow mutual sealing of the filter devices with each other and / or with the receiving housing.

The increasing worldwide use of fossil fuels and fuels, in particular the ever increasing use of internal combustion engines with an increasing number of vehicles of all kinds, leads to correspondingly increasing loads on the ambient air. In particular, in enclosed spaces, such as interiors of vehicles, cabs of mobile equipment and other premises, resulting in the occupants alarming high risk of high concentrations of respirable micronutrients and nanoparticles in the air. Depending on their particle size, nano-dust not only penetrates the lungs, but also penetrates dangerously deep into the entire organism, the smaller, the more dangerous. Also away from the burdens of exhaust gases of internal combustion engines and from abrasion of tires and brakes of vehicles, loads result from ultra-fine and nanoparticles even in dusty working environments, such as mining, earthworks, Gebäudeabriss- and -Sanierung etc .. Usual, provided in motor vehicles filter for driving Guest aeration and heating do not meet the requirements, especially in the fine dust and nanoscale. In order to achieve an improved cleaning effect for particularly endangered work areas, single filter devices are provided in the composite for cabin ventilation of machines, which have different filter properties, such as coarse filter and fine filter, which are arranged interchangeable in the respective receiving housing. For the safe operation of such devices, the filter devices must be replaced after appropriate periods of operation. The relevant maintenance work is cumbersome in the known devices and are therefore faulty.

Based on this problem, the invention has the object to provide a filter device of the type considered available, which is particularly safe to operate with low maintenance.

According to the invention this object is achieved by a filter device having the features of claim 1 in its entirety. Accordingly, the invention is characterized in that a guide device is provided which brings the respective filter device when inserted into its functional position within the receiving housing along a predetermined guideway of an unsealed position in a sealed position. In the case of changing operations, this ensures that, during the process of inserting a respective filter device, it automatically reaches the sealed position in its functional position. This not only simplifies maintenance, but also avoids the risk of incorrect operation.

The solution according to the invention can be provided not only for air applications but also for filtering other media streams, for example for oil. finally hydraulic oil or for fuels, also in the form of diesel fuel. With the invention, a single filter cartridge in a device housing can be sealed in a sealing manner, but preferably a plurality of filter cartridges are accommodated, which are then also to be sealed against each other.

In advantageous embodiments, the guide device consists of at least one control part, which engages in a assignable guide receptacle as part of the guideway.

With particular advantage, the arrangement can be made in this respect so that the guide receptacle is formed from a widening in the direction of engagement of the respective control part receiving space which is bounded at least on one side by an at least partially inclined guide wall along which at least partially the control part movably guided, wherein at the end of the maximum possible Verfahrstre- cke along the guideway, the control part moves under frictional engagement the oblique guide wall to increase the sealing force effect in an end position. As a result, the insertion movement by means of the control part leads to a force component producing the sealing force, so that the insertion process effects the self-sealing of the system.

In particularly advantageous embodiments, the respective control part engages in a releasable manner at least when reaching the maximum possible sealing force effect in a recess of the receiving space of the guide means. As a result, a releasable locking of the respective filter device is realized in the functional position. In particular, the mentioned locking represents a pre-positioning of the filter devices to facilitate the overall assembly for the filter device. Advantageously, the respective control parts may be formed by knob-like projections, which are arranged opposite the bottom of the receiving housing in the same engagement height on the inside of two opposite side walls of the receiving housing, the pairs are mutually congruent with each other congruent.

In particularly advantageous embodiments, the respective filter device is formed from a filter cartridge, which, provided with a housing, the media, in particular air-permeable filter material, wherein the enclosure carries on at least one of its free end faces a flexible resilient sealing ring as part of the sealing device. Such can be formed by a strand consisting of a PU foam, which runs along the edge of a flow-through end face of the respective filter cassette.

With regard to the design of the guide device, the arrangement can advantageously be made such that the respective filter cassette on opposite side walls and facing outwards, the respective control part, each having assignable guide receptacle.

In particularly advantageous embodiments, the filter housing for receiving the respective filter cartridge forms a trough-like filter housing receiving space, which closable by a cover part, with increasing feed movement of the same initially upwardly out of the filter housing receiving space projecting respective filter cartridge down in the direction of the filter housing bottom the sealed functional position brings. As a result, the maintenance operations are particularly simple and safe, because the closing of the housing cover simultaneously ensures the achievement of the sealed functional position, because the lid is not closable when the respective filter cartridge is not in its correct operating position. For a further increase in the reliability of the device can be present with particular advantage in addition to the guide means a distinctive feature that ensures that depending on 5 of their assigned function task each correct filter cartridge passes beyond doubt in its assigned functional position.

Advantageously, the arrangement can be made in this respect so that as part of the distinctiveness of the filter housing bottom and T O has inside bevels, which cooperate with assignable corresponding recesses on the respective filter cartridge such that always unmistakably the respective correct filter cartridge enters its functional position.

The receiving housing may have at least one inflow and one outflow opening in order to flow through the respective filter cassette with a medium flow, in particular in the form of an air flow. Advantageously, for this purpose, a fan generating the flow may be provided within the receiving housing, so that the entire system of the filter device is located within the receiving housing and the device thereby forms a closed unit that can be installed in appropriate machines or vehicles or with the existing Vehicles and machines can be retrofitted. In particularly advantageous embodiments, a plurality of filter cartridges are arranged one behind the other, of which seen in the direction of flow of the medium increases the predetermined filter fineness of the respective filter cartridges, and additionally and finally in the flow direction a filter cartridge with activated charcoal components in the Aufnahmegehäu- 0 se is used. Activated carbon and comparable absorbing filter media also allow removal of toxic substances or unpleasant odors from a media stream passing through the filter.

The invention with reference to an embodiment shown in the drawing is explained in detail. Shown are perspective oblique views of the embodiment of the filter device according to the invention, as seen on the closure side or hinge side of the cover part. a plan view of the device with removed cover part; a drawn in approximately natural size of a practical embodiment perspective

An oblique view of a single filter cartridge, as seen on the sealing device having an end face;

Functional sketches showing the interaction of a guide means of the receiving housing with the track of three filter cartridges, wherein the movement sequence is shown during the insertion process of the cartridges. an oblique perspective view of the functional group used in the group of three filter cartridges;

9 is a perspective oblique view of a side wall of the receiving housing, as seen on the inside, and a similar to Figs. 5 to 7 functional sketch, in which the situation is shown in case of incorrect sequence of Filterkas setten.

In the drawings, the invention with reference to an embodiment of an air filter device for filtering cabin air, for example in cabs mobile work machines, explained. It goes without saying that the invention can likewise be advantageously used for filtering other fluid media, for example for process gases in which purity requirements have to be met. As shown particularly in FIGS. 1 to 3, the device has a receiving housing 1 with a rectangular outline and walls running perpendicular to the floor surface 3 (FIG. 3), of which the end walls are denoted by 5 and the side walls by 7. At the top of the receiving housing 1 by a pivotally hinged, planar cover part 9 is closed, which is connected to a side wall 7 via hinges 1 1 and in the closed state, as shown in Fig. 1 and 2, on the other side wall 7 via snap closures 13th usual type in the closed position is sicherbar. In the vicinity of this side wall 7 there is a handle 1 5 for pivoting the cover part 9. In the state shown closed in FIGS. 1 and 2, the receiving housing 1 forms a flat box. At the snap-in closures 1 3 having side wall 7 is an access 1 7 for an electrical connection connection, in particular for the control and power supply located in the housing 1 fan device, which is not shown in the drawings and which generates a stream of air in the usual way which enters via two flow inlets 19 on one end wall 5 and exits via a flow outlet 21 on the opposite end wall 5. The housing 1 is provided for receiving a group of three filter devices in the form of filter cassettes in a rectangular parallelepiped shape. One of the fi lter cassettes is shown separately in Fig. 4. 5 to 8 show the group of filter cartridges, wherein in the drawing in the right-to-left direction of flow serving as Voroder Grobfi older filter cartridge 23, a fine or Nanofi older filter cartridge 25 and located at the flow outlet end filter cartridge 27 are provided as a gas filter, the latter in the form of an activated carbon filter. Serving as a pre-filter or coarse filter filter cartridge 23 is designed for a filter fineness, in which the separation efficiency for particles of more than 10 μνη is about 90%. The separation efficiency of the filter cartridge 25 serving as a fine filter or nanofilter is about 99% for particles of the order of 0.3 μm or less. In order to provide the largest possible fi lterfläche available and at a air flow rate of 30 to 60 m ³ / h to achieve a small pressure difference, which is less than about 10 mbar, is preferably a filter material of the filter cartridges 23, 25 Pl issued Fi ltermatte provided. As shown most clearly in FIG. 4, the filter cassette 27, like the other filter cassettes 23, 25, is encapsulated by its enclosure 37 except for the flow-through end walls 5. On one of the end walls 35, which is visible in Fig. 4, on which the flow-through surface surrounding edge of the enclosure 37, a sealing ring 29 is provided, which is formed by a strand of a PU foam.

As a functional component of a guide device which, when the filter cassettes 23, 25, 27 are inserted into the receptacle housing 1, brings them into a sealed functional position, a guide receptacle 33 is provided on each of the sidewalls 31 of the housing 37 of each filter cassette 23, 25, 27. This bi lodges in the lower third of each side wall 31 of the filter box. Setten 23, 25, 27 each have a receiving space 39 for each control part. These control parts have the shape of nubs 41, which, as can be seen most clearly in FIG. 9, protrude from the inside of the respectively facing side wall 7 of the housing 1. The receiving spaces 39 are each on one side, in FIGS. 5 to 8 and 10 this is the left side, bounded by an inclined, rib-like guide wall 43. When inserting the filter cassettes 23, 25, 27 in the direction of movement to the bottom surface 3 of the receiving housing 1, the filter cassettes 23, 25, 27 mediated by the interaction of the guide walls 43 with the led nubs 41 a movement component, which in the

Viewing direction of Fig. 5 to 8 and 10 is directed to the left. As a result, the filter cassettes 23 and 25 with sealing force generated by the oblique course of the guide walls 43 sealingly pressed with their sealing rings 29 against each other. The last filter cartridge 27 in the direction of flow is pressed sealingly against its housing-mounted sealing frame 45, see FIG. 3, with its sealing ring 29.

Figs. 5 to 7 show the progress of the insertion process. 5 shows the first stage, wherein the filter cassettes 23, 25, 27 are located at a greater distance from the bottom part 3 with the cover part 9 of the housing 1 open. The knobs 41 are located on the guide wall 43 still below a shoulder 47 which separates the receiving space 39 from a latching recess 49. Fig. 6 shows the stage 2, wherein the cassettes 23, 25, 27 are further approximated to the bottom part 3 and the nubs 41 are already within the recess 49. In this vertical position, however, the cover part 9 of the housing 1 is not yet closable. FIG. 7 shows the end or functional position in which the knobs 41 have reached the upper end of the guide wall 43 for generating the maximum sealing force effect and are latched in the latching recess 49. By closing the lid part 9, the cassettes 23, 25, 27 are held in this functional position and, so to speak, pressed together sealingly. In the in Fig. 7 shown end or latching position press the studs 41 with an axial horizontally extending force component on the respective assignable oblique guide wall 43 which limits the receiving space 39 so as to exert in this horizontal direction a high pressing force on the individual seals in the form of the sealing rings 29 which flexibly compressed then abut against the respectively adjacent rear end wall of the preceding in a sequence filter cartridge 23, 25. The contact force is carried out purely on the cover part 9 of the container, so that additional bracing or fixing devices in addition to the container are not needed.

In order to ensure that the respectively correct filter cassette 23, 25, 27 reaches the functional position assigned to it in the housing 1 for the respectively provided cleaning task, a non-interchangeable device is provided. Their operation is most clearly Figs. 9 and 10 can be removed. As shown in FIG. 9, 41 fitting bodies 51 are provided with inclined surfaces 53 on the side walls 7 of the housing 1 below the knobs. In the correct order of the cassettes 23, 25, 27, see in particular Fig. 7, the fitting body 51 are suitably received with their inclined surfaces 53 in recesses 55 on the guide receptacle 33. As a result, the cassettes 23, 25, 27 can be inserted completely into the functional position, so that the cover part 9 of the housing 1 can be closed. On the other hand, Fig. 10 shows the state of the erroneous order. While, in the situation shown in FIGS. 5 to 7, the lengths of the fitting bodies 51 and the lengths of the recesses 55 are matched to each other in error-free cassette order, the wrong order of the cassettes 27 and 25 shown in FIG characterized collision points, so that the cassettes 25 and 27 are blocked with a housing projection and the lid part 9 is not closable. It will be understood that instead of a physical coding device as shown herein, a different type of coding, such as an RF-ID system, could be provided. Instead of the fitting bodies 51, in this case, at least one of the side walls 7 could be provided with RF antennas assigned to the cassette places. The unmistakable device maintains a distance to the respective filter cassette 23, 25, 27 in their functional positions, in order to avoid seating of the respective filter cassette 23, 25, 27 on the non-identifiable device; otherwise, the fixing system for the respective filter cassette 23, 25, 27 may prove to be over-determined and it could not be ruled out that when closing the lid 9 and advancing the respective filter cassette 23, 25, 27 in the direction of their functional position, this can not assume the functional position, but in advance on the slopes 51, 53 of the Unverwechselbarkeitseinrichtung seated. This is avoided by the spacing.

If the bevels with the oblique surfaces 53 come into corresponding overextension with the assignable fitting bodies 51 of the filter cassettes, it can be provided in any case that an inclined surface 53 here the middle inclined surface 53 according to FIG. 9, the unambiguity assignment of two adjacent filter cassettes, here the filter cartridges 25 and 27, serving in their juxtaposition.

The filter cassettes 23, 25 and 27 can be performed as shown in FIG. 3 in a central region of the overall container 1 in a kind of separate housing housing and received in the container 1 accordingly. In this way, in the direction of flow from the flow inlets 19 for the flow outlet side 21 in front of and behind the cassette composite, further media flow spaces are created within the container 1 which can be used to arrange additional coarse particle filters, for example on the flow inlet side and toward the flow outlet side 21, a corresponding fan or fan means (not shown) may be inserted into the container 1 to accomplish the media flow through the container 1. Since the individual filter cassettes 23, 25, 27 are sealed against each other and against the cassette receiving parts of the container 1, along their free, facing end faces, needs to be provided on the lid underside of the lid part 9 at this point no additional seal. The addressed adjacent spaces within the container 1 would, however, at least on the lid side, preferably on the container top side, be provided along an edge guide with an additional seal in order to prevent the medium from flowing out of the container 1, in particular if by fan operation Within parts of the container an overpressure should arise. The respective Umhausung 37 for the filter cartridges is made of a plastic material, such as polyamide material. The lower thirds of each side wall 31 of the filter cassettes, which face a side wall 7 of the container 1, have a complicated manufacturing geometry for forming the receiving spaces 39, the shoulders 47 and the guide wall 43, so that the housing parts are best described as To realize injection molded parts. The extent produced as an injection molded part independent side wall parts of each filter cartridge 23, 25, 27 are then adhesively connected to the other side wall parts of the enclosure 37, wherein corresponding recesses in the side wall parts 31 of the housing can be present in the then web-like projections of the Injection molding structured sidewall parts 31 can be glued (not shown). In this way results for the respective Kassettenumhausung 37 a robust construction.

Claims

P a n t a n s p r e c h e

Filter device, in particular in the form of an air filter device, preferably for filtering cabin air in working machines with a receiving housing (1) for receiving individual filter devices (23, 25, 27) which cooperate with a sealing device (29) which seals the filter devices ( 23, 25, 27) with each other and / or with the receiving housing (1), characterized in that a guide device (33, 39, 41, 43) is present, the respective filter means (23, 25, 27) when inserted into their functional position within the receiving housing (1) along a predetermined guideway (43) from an unsealed position brings in a sealed position.

Filter device according to claim 1, characterized in that the guide device consists of at least one control part (41) which engages in a assignable guide receptacle (33) as part of the guide track (43).

Filter device according to claim 1 or 2, characterized in that the guide receptacle (33) from a in the direction of engagement of the respective control part (41) widening receiving space (39) is formed, at least on one side of an at least partially inclined, the Guiding path forming guide wall (43) is limited along which at least partially the control part (41) is movably guided, and that at the end of the maximum possible travel along the guide wall (43), the control part (41) under frictional engagement the obliquely extending guide wall (43 ) moved to increase the sealing force effect in an end position.

4. Filter device according to one of the preceding claims, characterized in that the respective control part (41) engages at least when reaching the maximum possible sealing force effect in a Rastaus- recess (49) of the receiving space (39) of the guide device in a releasable manner again.

5. Filter device according to one of the preceding claims, characterized in that the respective control parts knob-like projections (41) form, with respect to the bottom (3) of the receiving housing (1) in the same engagement height on the inside of two opposite side walls (7) of the receiving housing ( 1) are arranged, which are in pairs opposite to each other congruent.

6. Filter device according to one of the preceding claims, characterized in that the respective filter device from a filter cartridge (23, 25, 27) is formed, which, provided with a housing (37), the media, in particular air-permeable filter material comprises, and that the housing (37) bears on at least one of its free end faces (35) a flexible yielding sealing ring (29) as part of the sealing device.

7. Filter device according to one of the preceding claims, characterized in that the respective filter cartridge (23, 25, 27) on opposite side walls (31) and outwardly facing the respective control part (41), each having assignable guide receptacle (33) ,

8. Filter device according to one of the preceding claims, characterized in that the housing (1) for receiving the respective filter cartridge (23, 25, 27) forms a trough-like filter housing receiving space (1) of a lid part (9) closable with increasing delivery movement of the same next upward from the filter housing receiving space (1) projecting respective filter cartridge (23, 25, 27) down in the direction of the filter housing bottom (3) brings in the sealed functional position.

9. Filter device according to one of the preceding claims, characterized in that in addition to the guide means (33, 39, 41, 43) a unique means (51, 55) is present, which ensures that depending on their assigned Funktionsauf- the respective correct filter cartridge (23, 25, 27) reaches the assigned functional position beyond doubt.

10. Filter device according to one of the preceding claims, characterized in that as part of the unambiguity device, the filter housing (1) on the inside and bottom slopes (51, 53), with assignable corresponding recesses (55) on the respective filter cartridge 23, 25, 27) cooperate in such a way that always unmistakably the respective correct filter cartridge (23, 25, 27) reaches its functional position.

1 1. Filter device according to one of the preceding claims, characterized in that the receiving housing (1) at least one inflow (19) and an outflow opening (21) for the passage of the respective filter cartridge (23, 25, 27) with a media stream, especially in the form of an airflow.

12. Filter device according to one of claims 1 to 1 1, characterized in that a plurality of filter cartridges (23, 25, 27) are arranged one behind the other, seen in the direction of flow of the medium, the predetermined filter fineness of the respective filter cartridges (23, 25) increases, wherein additionally and finally in the direction of flow, a filter cartridge (27) with activated charcoal constituents can be inserted into the receiving housing (1).