EP2775225B1 - System, comprising a support frame, a filter element fixed in it, as well as at least two fixing devices - Google Patents

Description

The invention relates to a system comprising a holding frame, which consists of interconnected frame parts, a filter element which can be fixed therein and at least two fixing devices, wherein each frame part has at least partially an L-shaped cross-section with an abutment leg and with a side leg formed on the outside thereof, wherein the Holding frame is in particular formed circumferentially and wherein the outer contour of the filter element is formed so that the filter element is reversibly insertable into the holding frame and by means of at least two distributed over the circumference of the filter element arranged fixing means relative to the holding frame can be fixed.

For example, an embodiment in which the holding frame consists of at least two separate frame parts which, for example, are interconnected in the corners, for example by screwing together, is understood by the formulation of interconnected frame parts. The holding frame can also be formed in one piece. In such an embodiment, the support frame in the corners corresponding angled and the two free ends are interconnected.

In known systems, the fixing means are formed as wire hanger, wherein each wire hanger is pivotally mounted on a frame part and the free end for fixing under a tab, which is arranged on the adjacent frame part is guided. The release thus requires on the one hand a pressing down of the wire bracket and on the other hand a lateral displacement, so far as the assembly and disassembly are complicated. Also, all wire brackets for loosening the filter element must be released from the support frame. From the DE 102 35 407 A1 a filter with a plate-shaped filter element according to the preamble of claim 1 is known. The object of the invention is to avoid the aforementioned disadvantages and to provide a system in which the installation and the removal of a filter element is easier.

This object is achieved in that at least one fixing device comprises an elastically formed and / or resiliently mounted fixing element with a contact region, wherein the fixing element from its fixing position in which it fixes the filter element in the holding frame, for inserting the filter element in the holding frame or to remove the filter element from the holding frame against its restoring force in the direction of the adjacent side leg is temporarily displaced and due to its restoring force, a subsequent automatic shift back is given back to its fixing position.

The filter element can be designed as desired. Thus, the filter element usually has a frame into which a suitable filter material is inserted. The filter element For example, it may also include pocket filters arranged side by side.

The holding frame usually has holes in the region of its side legs through which screws or rivets are guided for fixing the holding frame to the inside of a channel. The fixing devices are distributed at least approximately uniformly over the circumference. For example, if it is a quadrangular holding frame, in each case a fixing device can be arranged in the four corners.

When installing the filter element, the filter element only has to be pressed into the holding frame. The fixing elements are against their restoring force to the outside, d. H. shifted in the direction of the adjacent side leg. If the filter element has passed the fixing elements, an automatic displacement of the fixing elements takes place, so that the filter element is held securely by the contact regions of the fixing elements acting on it and a pressing into the holding frame takes place.

If the filter element is to be removed again, only one or more fixing elements must be displaced against their restoring force to the outside, so that then the filter element can be removed. The dimensions of the fixing elements are chosen so that the filter element can be brought into its fixing position. The contact region may be formed as a line or as a surface.

The distance between the plant leg on the one hand and the contact area on the other hand, at least in about the thickness, in particular, exactly the thickness of the filter element in correspond to the fixed area of the filter element. This causes a secure fixation of the filter element in the support frame.

At least one fixing device can be part of the side leg itself. In this case, the fixing device is formed integrally with the side legs.

At least one fixing element can be designed as a partial region of the side limb projecting inwards in relation to the general extension of this side limb. Inwardly above, an orientation is understood in which the partial region protrudes into the holding frame and insofar as the fixing element fixes the filter element in the fixing position. The contact region is arranged, for example, at the free end of the fixing element.

Alternatively, at least one fixing device may be formed as a separate component which can be fastened to the holding frame, in particular on the inside of at least one side leg. The support frame may for example consist of sheet metal or other suitable material. The fixing device may for example consist of a plastic or of another suitable material. The fixing device can be connected, for example, by gluing to the holding frame. Of course, other connections, such as screw or rivet connection, possible.

It is advisable if the holding frame on the inside at least one tab, preferably two, spaced apart, facing each other and inwardly directed tabs, each tab with the adjacent Area of the side leg forms a, in particular slot-shaped, insertion, and that the fixing device has a number of tabs corresponding number of holding areas. The tab can be viewed unilaterally opened in the insertion or formed closed on both sides. The fixing device must be performed with each holding area only in the corresponding slot-shaped insertion area. This embodiment allows easy replacement of a fixing device, if this is damaged, for example.

Preferably, all tabs of at least one fixing device are arranged on a common frame part of the holding frame.

In at least one fixing device, at least one holding region, seen in the insertion direction, can be formed protruding laterally over the side edge of the fixing device.

In at least one fixing device, two holding regions may be provided, wherein in each case one holding region is arranged on each of the two side edges of the fixing device aligned parallel to the insertion direction. In such an embodiment, the fixing device is fixed on both sides, which ensures a secure fixation.

In at least one fixing device, both holding regions can be formed laterally over the respective side edge.

Alternatively, the tabs of at least one fixing device on the corner of each one frame part of two in This corner of adjacent frame parts of the holding frame, ie, be arranged on separate, touching frame parts, wherein the one holding portion of the corresponding fixing device in the insertion direction is formed laterally over the side edge of the fixing device and the other holding portion is formed facing forward, so that both Lugs angle, in particular at a right angle, are arranged to each other. By pointing forward, it is understood that the holding area in question points in the mounting position of the fixing device in the direction of the opposite frame part.

At least one tab can be arranged on the inside of the side leg.

It is advisable if at least one tab is designed as a subregion protruding from the side limb, in particular processed by a bending process. Such a tab can be produced for example by punching and subsequent bending.

In order to avoid unintentional release of the fixing device from the mounting position, the fixing device can be brought in its mounting position in a latching connection with the holding frame.

On the one hand, the fixing device can have an elastically formed and / or spring-mounted projection on the side facing the side leg, and, on the other hand, a recess corresponding to the projection can be provided either in the side leg or the side leg can have an inwardly directed latching projection. behind the lead locked in the mounting position of the fixing device, have. Such a configuration allows for a simple installation and on the other hand a simple disassembly of a fixing device, if it is damaged, for example. Of course, a reverse arrangement of projection on the one hand and recess or latching projection on the other hand possible.

At least one fixing device may have at least one centering projection on its side facing the filter element in the fixing position. This centering projection preferably increases in depth when viewed in the insertion direction, so that the filter element is displaced when it is inserted into the desired fixing position.

It is advisable if the filter element is sealed off from the filter element by a seal, in particular by a circumferential seal arranged on the contact leg. By pressing the filter element to a seal applied in the holding frame a gas-tight connection is ensured. Of course, the seal may also be provided on the filter element.

Fig. 1

eine schräge Draufsicht auf einen Halterahmen,

Fig. 2

den Gegenstand nach Fig. 1 mit eingesetztem Filterelement,

Fig. 3

das Detail "X" aus Fig. 2,

Fig. 4

das Detail "Y" aus Fig. 1 und

Fig. 5

einen Bereich des Halterahmens einer alternativen Ausführungsform.

Embodiments of the invention illustrated in the drawings are explained below. Show it:

Fig. 1

an oblique top view of a holding frame,

Fig. 2

the object after Fig. 1 with inserted filter element,

Fig. 3

the detail "X" off Fig. 2 .

Fig. 4

the detail "Y" off Fig. 1 and

Fig. 5

a portion of the support frame of an alternative embodiment.

In all figures the same reference numerals are used for identical or similar components.

In the FIGS. 1 to 5 two different embodiments of a system according to the invention are shown.

The system according to the invention comprises a holding frame 1, which is quadrangular in the illustrated embodiment. The holding frame 1 is formed in one piece in the illustrated embodiment. In the four corners of the support frame 1 is angled, so that the support frame 1 has a total of four frame parts 2. The two free ends are connected. Each frame part 2 has an L-shaped cross section with a bearing leg 3 and with a side leg 4 formed on the outside thereof. In the area of the side leg 4, a circumferential seal 5 is provided.

In the holding frame 1, which is installed for example in a non-illustrated channel of a ventilation system and / or in a RLT device, a filter element 6 can be used. For mounting the holding frame 1 in a channel or for connection to one another to a channel wall 4 holes 7 are provided in the side legs. At the in FIG. 2 illustrated embodiment, the filter element 6 comprises a filter insert. Of course, other embodiments of a filter element 6 are possible.

The outer contour of the filter element 6 is formed so that the filter element 6 is reversibly inserted into the holding frame 1. For fixing the filter element 6 in the support frame 1 are in the embodiment according to Fig. 1 to 4 a total of four arranged in the four corners fixing 8, as provided in particular in FIG. 4 are shown in detail.

In the in the FIGS. 1 to 4 illustrated embodiment, each fixing device 8 is formed as a separate component which is reversibly attachable to the support frame 1. For this purpose, a total of two tabs 9 are provided on the inside of the side leg 4 of the holding frame 1 for each fixing device. Each tab forms with the adjacent region of the side leg 4 a slot-shaped insertion region 19.

The two corresponding tabs 9 of each fixing device 8 are arranged at a distance from each other, facing each other and inwardly aligned. Inwardly directed is understood to mean such an orientation, in which the tabs 9 point in the area spanned by the holding frame 1.

The two corresponding tabs 9 are arranged above the corner. Thus, one tab 9 is provided on the one frame part 2 and the other tab 9 on the adjacent other frame part 2 of the holding frame 1.

At each of the two parallel to the insertion direction (arrow 10) aligned side edges 11 a on the respective side edge 11 formed above holding portion 12 is provided. The holding region 12 on the one side edge 11 projects laterally beyond the fixing device 8 and thus lies in the general extent of the fixing device 8, while the holding portion 12 of the other side edge 11 protrudes forward over this side edge 11, so that the fixing device 8 receives an angular configuration and thus can cooperate with the tabs 9 arranged above the corner.

When mounting the fixing device 8, each of the two holding portions 12 seen in the insertion direction 10 is inserted into its corresponding tab 5 until the fixing device 8 has reached its mounting position. In the in the Fig. 1 to 4 illustrated embodiments, each tab 9 seen in the insertion direction 10 is formed open on one side.

On the side leg 4 facing side, the fixing device 8 has an elastically formed projection 13. Each projection 13 is assigned a recess 14 provided in the side limb 4, which corresponds with the associated projection 13 in the mounting position of the fixing device 8. The aligned parallel to the stop leg 3 and arranged closer to the stop leg 3 edge of each recess 14 is formed as an inwardly bent latching projection 14a. Upon reaching the mounting position of the projection 13 engages behind the locking projection 14a.

On the side opposite the side leg 4, each fixing device 8 has a fixing element 15, which is elastically formed and / or resiliently mounted. The fixing element 15 has a contact region 16. The fixing element 15 can be made of his in Fig. 4 shown fixing position for insertion of the filter element 6 in the holding frame 1 and for removing the filter element. 6 be displaced temporarily from the holding frame 1 against its restoring force in the direction (arrow 17) of the adjacent side leg 4, so that the filter element 6 can be inserted or removed. Due to its restoring force, the fixing element 15 is then automatically moved back again.

As FIG. 4 it can be seen, the free end of each fixing element 15 is formed as a contact region 16. In the fixing position, the contact region 16 of each fixing device 8 interacts with the top side of the filter element 6. In addition, a centering projection 18 is provided on each holding region 12 on the filter element 6 side facing each fixing 8. Thus, the support frame 1 has a total of eight centering projections 18 which automatically center the filter element 6 during insertion and hold it in a centered position.

In Fig. 5 an alternative embodiment of a fixing device 8 is shown. Here, the fixing device 8 is part of the side leg 4 itself. The fixing element 15 is designed as an opposite to the general extent of the side leg 4 inwardly projecting portion of the side leg 4. This subarea can be generated, for example, by punching and subsequent bending. In such an embodiment, the frame part 2 is made of sheet metal, for example, so that the fixing element 15 embodied as a partial region is elastically resilient. The mode of action is identical to the fixing device 8 according to FIGS. 1 to 4.

Claims (17)

1. System, comprising a support frame (1), comprising of frame parts (2) connected to one another, a filter element (6) which can be fixed therein, and at least two fixing devices (8), wherein each frame part (2) exhibits at least partially an L-shaped cross-section, with a locating arm (3) and a side arm (4) formed on the outside thereof, wherein the support frame (1) is configured in particular as circumferential, and wherein the outer contour of the filter element (6) is configured in such a way that the filter element (6) can be reversibly inserted into the support frame (1) and, by means of the at least two fixing devices (8), arranged so as to be distributed over the circumference of the filter element (6), can be fixed opposite the support frame (1), wherein at least one fixing device (8) comprises a fixing element (15) which is configured as elastic and/or mounted under spring force and with a contact region (16), characterised in that the fixing element (15) can be temporarily displaced out of its fixing position, in which it fixes the filter element (6) in the support frame (1), so as to insert the filter element (6) into the support frame (1) or, respectively, to remove the filter element (6) from the support frame (1) against its resetting force in the direction (arrow 17) of the adjacent side arm (4), and, due to its resetting force, a subsequent automatic return to its fixing position takes place.
2. System according to the preceding claim, characterised in that the distance interval between the locating arm (3) on the one hand and the contact region (16) on the other corresponds at least approximately to the thickness of the filter element (6), and in particular precisely to its thickness, in the fixed region of the filter element (6).
3. System according to any one of the preceding claims, characterised in that at least one fixing device (8) is a part of the side arm (4) itself.
4. System according to any one of the preceding claims, characterised in that at least one fixing element (15) is configured as a part region of the side arm (4), projecting inwards opposite the general extension of this side arm (4).
5. System according to any one of the preceding claims, characterised in that at least one fixing device (8) is configured as a separate component, which can be secured to the support frame (1), in particular to the inside of at least one side arm (4).
6. System according to any one of the preceding claims, characterised in that the support frame (1) comprises on its inside at least one link (9), and preferably two links (9) arranged at a distance from one another, facing one another and directed inwards, wherein each link (9) forms with the adjacent region of the side arm (4) an introduction region (19), in particular slot-shaped, and that the fixing device (8) comprises a number of holding regions (12) corresponding to the number of links (9).
7. System according to any one of the preceding claims, characterised in that all the links (9) are allocated to at least one fixing device (8) at a frame part (2) of the support frame (1).
8. System according to any one of claims 6 or 7, characterised in that, with at least one fixing device (8), at least one holding region (12), seen in the introduction direction (10), is configured so as to project laterally over the side edge (11) of the fixing device (8).
9. System according to any one of claims 6 to 8, characterised in that, with at least one fixing device (8), two holding regions (12) are provided for, wherein, arranged on each of the side edges (11) of the fixing device (8), aligned parallel to the introduction direction (10), is in each case a holding region (12).
10. System according to any one of the preceding claims, characterised in that, with at least one fixing device (8), both holding regions (12) are configured such as to project laterally over the respective side edge (11) in each case.
11. System according to any one of claims 6 to 10, characterised in that the links (9) of at least one fixing device (8), over a corner at a frame part (2) in each case, are arranged at two frame parts (2) of the support frame (1), which are adjacent at this corner, wherein the one holding region (12) of the corresponding fixing device (8), seen in the introduction direction, is configured such as to project laterally over the side edge (11) of the fixing device (8), and the other holding region (12) is configured such as to point forwards, such that both links (9) are arranged at an angle to one another, in particular at a right angle.
12. System according to any one of claims 6 to 11, characterised in that at least one link (9) is arranged on the inside of the side arm (4).
13. System according to any one of claims 6 to 12, characterised in that at least one link (9) is configured as a part region projecting out of the side arm (4), formed in particular by a bending process.
14. System according to any one of claims 5 to 13, characterised in that the filter device (8) in its installed position can be brought into a latching connection with the support frame (1).
15. System according to any one of the preceding claims, characterised in that, on the one hand, the fixing device (8) comprises, on the side facing the side arm (4), a projection (13) which is configured as elastic and/or mounted under spring force, and, on the other, either in the side arm (4) an aperture (14) is provided which corresponds in the installed position to the projection (13), or the side arm (4) comprises an inwards facing latch projection (14a), behind which, in the installed position of the fixing device (8), the projection (13) engages.
16. System according to any one of the preceding claims, characterised in that at least one fixing device (8) comprises at least one centring projection (18) on its side facing the filter element (6) in the fixed position.
17. System according to any one of the preceding claims, characterised in that the filter element (6) is sealed by means of a seal (5), in particular by a seal (5) arranged circumferentially on the locating arm (3), opposite the filter element (6).

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