WO2023072599A1

WO2023072599A1 - Filter fan in box form with screw-free rapid fastening device

Info

Publication number: WO2023072599A1
Application number: PCT/EP2022/078410
Authority: WO
Inventors: Michael Rudi Seifert; Alexander Camilleri
Original assignee: Seifert Systems Ltd.
Priority date: 2021-10-26
Filing date: 2022-10-12
Publication date: 2023-05-04
Also published as: DE102021127828B3

Abstract

The invention relates to a filter fan in box form with a screw-free rapid fastening device, consisting of an, at least two-part, housing comprising a main body with a fan receptacle and filter receptacle, wherein a frame-like set-back portion adjoins the main body, and an access opening opposite it can be closed by a cover protruding over it in the form of a roof. The wall of the main body has a multiplicity of flow openings, on the inside of which a filter material is exchangeably fitted. The frame-like set-back portion merges into a main body base having a plurality of flow openings. At least one clip-like rapid fastening device is inserted captively into each of the recesses in the side walls of the set-back portion in order to fix the air filter in a cutout in a switch cabinet in particular.

Description

Box-shaped filter fan with screwless quick-fastening device

Description

The invention relates to a filter fan in the form of a box with a screwless quick-fastening device, consisting of an at least two-part housing, comprising a base body with a fan and filter holder, with a frame-like recessed section adjoining the base body and an access opening opposite this can be closed with a roof-shaped projecting cover, furthermore, a wall of the base body has a large number of flow openings, on the inside of which a filter material is attached in an exchangeable manner, moreover, the frame-like recessed section merges into a base body floor having further flow openings, with at least one clip-type quick-action fastening device being able to be inserted captively into recesses in the side walls of the recessed section, to fix the filter fan in a recess of a structure that is complementary to the frame-like recess section, in particular a switch cabinet device or similar means, with at least part of the recess section being pushed into the recess in this regard according to the preamble of claim 1.

DE 10 2010 003 038 B4 discloses a filter box with a main base and at least one grid cover, with the main base being anchored inside a continuous opening in a wall of a switch cabinet, specifically with the help of elastic fastening inserts located in between.

The elastic fixing inserts comprise at least one pair of fork-shaped locking teeth capable of snapping by means of an elastic deformation force inside a corresponding anchoring seat of the main base. In a preferred embodiment of the elastic fastening insert piece, this has at least one section in the form of a curved Leaf spring, which is connected by means of at least one rib with at least one pair of fork-shaped locking teeth. These are adapted to be inserted, by means of an application of pressure, inside a respective locking seat located along the side walls of the main base, in order to keep this portion in the form of a curved spring leaf outside the corresponding side wall itself.

To mount the filter box in a continuous opening in a wall, the fork-shaped locking teeth of each fastening insert must be used. Upon insertion, a force is applied to the rib shown there, causing the rib to gradually curve. Thereby, the portion in the form of the bulging leaf spring adheres with its concave end to the outer surface of the side wall and the bulging itself is reduced. This fact favors the respective adjustment when inserting the main base to a depth necessary for each individual elastic fastening insert to be able to return to its respective rest position, thanks to its own restoring forces, as soon as contact with the edge of the opening itself shown there is broken.

The solution briefly outlined above enables improved screwless fixing, with the cover of a filter box being easier to open for replacing a filter cloth. However, it has been shown that, particularly with unavoidable tolerances, in particular with the dimensions of the relevant recesses or the material thickness of the filter box material or the associated control cabinet, the fastening insert breaks away, which jeopardizes the required secure hold and the necessary operational safety. Furthermore, due to thickness fluctuations of the materials used when unfavorable tolerances come together, the attachment is not free of play, which leads to undesirable mechanical vibrations, unnecessary noise development, leaks and other problems.

DE 10 2013 217 369 B3 shows a trough for accommodating a filter mat in a fan device. The pan has a peripheral side wall with an upper and a lower edge, the side wall forming a channel for air to flow through the pan. A floor is formed on the lower edge of the side wall and forms a floor grid. At least one resilient latching tongue is formed on the side wall. The latching tongue has a latching lug for latching the trough in an opening of a housing of a device into which the trough can be inserted.

The locking tongue is designed as an independent component.

In order to simplify the removal of the trough from a heat-generating device, it is proposed that the side wall be of closed design, with the exception of at least one opening next to the latching tongue at the level of its latching lug. Furthermore, the upper edge of the opening has a specific distance from the upper edge of the side wall. In addition, a fan device for installation in the wall of a heat-generating device is disclosed, this fan device comprising the briefly explained trough together with a grid cover.

DE 10 2016 107 190 B3 discloses a solution for stabilizing a protective grid against vibrations. In this respect, a protective grille clip is used to latch the protective grille.

Filter fan assemblies as roof-mounted devices are already known, for example, from DE 20 2013 103 846 U1.

The covering device for a roof vent according to EP 2 456 291 B1 is about simplifying the exchange of filter elements. Cover hood and a support frame there are detachably connected by means of a screw. Support frame and base frame are only fixed by means of a clamp connection. The covering hood and the support frame can thus be removed together from the base frame and possibly together with a filter element.

Furthermore, the covering hood and/or the support frame are designed there in such a way that the air flow is deflected several times when it passes through the covering device. Such a labyrinthine air flow reduces the ingress of foreign bodies and splashing water.

However, many years of experience have shown that all previously known filter fans, in particular so-called roof-mounted filter fans, have disadvantages with regard to the achievable degrees of protection, but also with regard to a particularly have easy installation and easy access to the filter materials used. One of the aims of further developments is to produce filter fans as a self-sufficient, complete component or a corresponding assembly that can be connected to the corresponding structure, for example a control cabinet, or arranged there, almost intuitively. Not only should all the necessary electrical and electronic components already be included in the filter fan, but it must also be ensured that the required degree of protection is maintained and the ingress of dirt and moisture is effectively prevented even over a long period of use under critical climatic or industrial conditions.

It is therefore the object of the invention to specify a further developed filter fan in the form of a box with screws or quick-action fastening devices, which basically consists of an at least two-part housing, specifically comprising a base body with a fan and filter mount, with a frame-like recessed section adjoining the base body. One of these opposite access openings is to be closed with a roof-shaped overhanging cover. The wall of the base body has a large number of flow openings, on the inside of which a filter material is attached, preferably in an exchangeable manner.

In particular, the object of the invention is to specify a further developed quick-action fastening device that can be used with very different filter fans with different dimensions of the base body and roof-shaped cover, and which ensures the necessary positive and non-positive connection under all circumstances, so that corresponding, known sealing elements , for example in the form of foam rubber strips, are kept under sufficient pretension so that the requirements for the degree of protection are met.

The shape of the base body and roof-shaped protruding cover should be implemented in such a way that the cover can be removed quickly for the purpose of accessing the filter material and the cover can be exposed, and the latter step can be carried out in a particularly self-centering manner. The object of the invention is achieved with the teaching according to patent claim 1, the subclaims comprising at least expedient configurations and developments.

Accordingly, a box-shaped filter fan with a screwless cutting attachment device is assumed.

The filter fan consists of an at least two-part housing, this comprising a base body with fan and filter holder.

A frame-like setback section is located on the base body. Opposite this set-back section is an access opening which can be closed with a roof-shaped overhanging cover.

The wall of the base body has a large number of flow openings, on the inside of which a filter material is attached in an exchangeable manner.

The frame-like setback section transitions into a base body bottom having a plurality of flow openings.

In recesses of the side walls of the recess section, at least one, preferably several, clip-type quick-action fastening devices are captively inserted in order to fix the filter fan in a recess of a structure, in particular a switch cabinet device, that is complementary to the frame-like recess section, with at least part of the recess section being pushed into the recess in this regard .

The base body is preferably a truncated pyramid or trapezoidal body, which rests on the control cabinet with its smaller base area and the recess section adjoining there, the recess section dipping at least partially into the opening in the control cabinet.

The roof-shaped cover is designed in the form of a hood with a lateral, sloping roof overhang. The dimensioning in this regard is carried out in such a way that the roof overhang covers at least partial areas of the side walls of the base body, so that the ingress of moisture or splashing water can be largely prevented.

The roof-shaped protruding cover can be fixed to the base body with the help of a quick-locking system. This can be a mechanical quick-locking system, a magnetic quick-locking system or a comparable quick-locking system.

For example, a quarter-turn locking system with a captive locking mechanism is used, or a locking system with a compression effect to keep the sealant between the housing side wall and the cover under the appropriate tension.

There are no fundamental restrictions with regard to the filter media used.

Fleece filters, foam filters, but also metal filters can be used.

The quick fastening device according to the invention is preferably realized from a plastic material by injection molding.

The quick attachment device has two base surfaces which are at right angles to one another.

The base surfaces are once designed as a long leg and on the other hand as a short leg.

The long, flat leg is inserted in a form-fitting manner in the region of one of the recesses on the respective side wall of the recessed section, and the short leg is inserted in a free cut of a collar of the recessed section.

At the lower end of the long leg in the immersion direction, a projecting web running transversely to the immersion direction is provided, which in one complementary slot engages in the side wall and, adapted to the material thickness of the side wall, at least one groove is formed on the long leg, which receives a section of the side wall in the region of the respective recess.

At least two elastic tongues extend on the long leg, starting from the web and reaching in the direction of the short leg. The tongue ends are designed to be freely movable and bent back and have several, parallel, graduated locking teeth for positive and non-positive hold in the recess of the structure, even if the material thickness of the structure, e.g. the roof area of a switch cabinet, has tolerances or a different Has thickness or material thickness.

A peripheral surface seal is formed in the area of the collar of the set-back section, which can be brought into contact with the surface of the structure. The necessary press fit is ensured by a sufficient number of quick-release fasteners. For example, if the basic body has a square base, there are two clips on each side, ie a total of eight clips, as quick-fastening devices.

As already mentioned, the base body is designed as a quasi upside-down truncated pyramid or trapezoidal body, the open access side of which accommodates the protruding cover, which can be attached to the truncated pyramid or trapezoidal body in a self-centering manner.

In the area between the elastic tongues, there is a rigid centering rib that is set back from the tongues and extends from the short to the long leg.

This centering rib leads to self-centering when the filter fan is inserted into an associated, complementary recess, for example in the control cabinet already mentioned several times or in a similar structure.

Means for attaching electronic control or regulating devices can be present on the base body floor. In particular, it is here to there for example by locking or screwing can be arranged thermal or Hydrostats, for example to ensure automatic or automatic control of the start-up of the filter fan.

The inner wall of the side walls of the base body has folded tabs for holding the filter material, so that further fastening means can be omitted.

The base body also has a stiffening body that bridges the side wall and on which the fan can be mounted.

According to the invention is also a switch cabinet with a switch cabinet roof, which has a recess for accommodating a filter fan, as described above.

The invention is to be explained in more detail below on the basis of exemplary embodiments and with the aid of figures.

Here show:

Fig. 1 is a perspective view of the clip-on invention

Quick attachment device;

2 shows a side view of the quick-action fastening device;

Fig. 3 is a front view of the quick attachment device;

FIG. 4 shows a view from below of the quick attachment device; FIG.

5 and 6 views to clarify the assembly process of the filter ventilator with a quick fastening device in a panel of a switch cabinet, for example, the panel having a relevant recess;

7 and 8 are detail views to clarify the process of assembling the quick fastening device in the recessed section the filter fan or the relevant housing, which has corresponding recesses;

9 shows a view from below into an exemplary control cabinet with an inserted filter fan and thermostats and hydrostats fastened there in the area of the base body floor; and

10 is a view of a complete filter fan with the cover lifted using the quarter turn locking means present there.

The quick-fastening device according to the invention, preferably made from a plastic material, will be described below with reference to FIGS.

The quick-action fastening device 10 initially has two base surfaces which are essentially at right angles to one another.

These base surfaces are designed as long legs 13 and as short legs 14 .

As can be seen from the combination of Figures 7 and 8, the long leg 13 is inserted in the area of one of the recesses 9 on the respective side wall of the recessed section 2 and the short leg 14 in a cutout 15 of a collar 16 of the recessed section 2 in a form-fitting manner.

In the immersion direction of the lower end 17 of the long leg 13, a projecting web 18 running transversely to the immersion direction is provided, in particular formed, which engages in a complementary slot 19 (see FIG. 8) in the corresponding side wall of the recessed section 2.

Adapted to the material thickness of the side wall, a groove 20 is formed on both sides of the long leg at the upper end, which receives a partial section 21 of the side wall of the corresponding recess (see FIG. 7). At least two elastic tongues 22 are present on the long leg 13, starting from the web 18 in the direction of the short leg 14 . As can be seen from Figure 2, the tongue ends 23 provided with the ratchet teeth 24 are designed in such a way that there is a gradation of the ratchet teeth, so that even with different thicknesses of the material of structure 12 there is a secure positive and non-positive connection between the filter fan and structure 12 (see Figure 6) results.

At the lower end 17 of the long leg 13 there is also a reinforcement section 31 which serves to stabilize the quick-action fastening device 10 .

Figures 5 and 6 serve to illustrate the process of assembling the complete filter fan assembly, specifically in relation to a recess 11 in a structure 12, for example a switch cabinet. This can be the surface of a finished switch cabinet, in order to ultimately allow the switch cabinet to be ventilated.

The base body 1 clearly has a setback section 2 here. There is an access opening on the upper side (see also FIG. 10), which can be closed with a roof-shaped cover 4.

The side wall 5 of the base body 1 has a large number of flow openings 6 (see FIG. 10). A filter material 7 is arranged on the inside.

A circumferential seal 25 is formed in the area of the collar 16 of the set-back section 2, which can be brought into contact with the surface of the structure 12, as can be seen from the sequence of illustrations according to FIGS.

The quick-fastening device 10 is inserted in a form-fitting manner in the region of one of the recesses 9 in the respective side wall of the recessed section 2 and in a free cut 15 of the collar 16 of the recessed section 2 . The web 18 is fixed in the complementary slot 19 in a latching manner. The elastic ones According to FIG. 5, tongues 22 are still relaxed. As the body 1 moves toward the structure 12, the tongues 22 come into contact with the edge portion of the recess 11 and are bent back. With further movement in the direction of the arrow, the respective rib 26 centers the base body 1 in the recess 11. The locking teeth 24 then latch in the edge area of the recess 11 with the material of the structure 12 present there. This takes place with partial relaxation of the relevant tongues 22 .

The cover 4 can be fastened to the centering collar 33, which is part of the base body 1, with the aid of a centering plate 32 fastened to the cover 4, with a captive quarter-turn quick-locking mechanism 34 being used in this regard.

The cover projection 41 protects against the ingress of moisture with respect to the wall 5, the flow openings provided there and the filter material 7 located on the inside.

Figures 7 and 8 show the insertion of the quick-fastening device 10 in one of the recesses 9 on the respective side wall of the recessed section 2. The short leg 14 is inserted in a free cut 15 of the collar 16 of the recessed section 2 in a form-fitting manner.

The web 18 dips into a slot 19 in the side wall.

The groove 20 can also be seen, which accommodates a partial section 21 of the side wall in the region of the respective recess. The centering rib 26 can be seen in FIG.

FIG. 9 shows a view of the underside of a filter fan arrangement used in a switch cabinet.

Visible here is the base body bottom 8 with flow openings 61 present there, the fixation by means of clip-type quick-action fastening devices and the arrangement of thermostats and hydrostats 27. The illustration 10 of a filter fan with the cover 4 lifted off reveals the stiffening support 29 with the fan 30 fastened there. The centering supports 33 for fastening the cover 4 with the aid of the locking system 34 can also be seen.

Reference List

body

return section

access opening

Lid

wall of the base body; 61 flow openings

filter material

body bottom

Recess in the side walls of the recess section 0 Clip-on cutting fastening device 1 Recess in the control cabinet 2 Control cabinet or structure 3 long leg 4 short leg 5 Cutout in the collar 6 collar 7 lower end of the long leg 8 web 9 slot in the side wall 0 groove in the long leg 1 Partial section of the side wall 2 tongue 3 tongue end 4 locking teeth 5 seal on the collar 6 centering rib 7 thermostat or hydrostat 8 folded tabs 9 stiffening beam 0 fan 1 tongue reinforcement section 2 centering plate 3 centering beam 4 quick-release lock 35 more seal

41 Lid overhang

Claims

Expectations

1. Box-shaped filter fan with screwless quick-fastening device, consisting of an at least two-part housing, comprising a base body (1) with fan and filter holder, with a frame-like recess section (2) adjoining the base body (1) and an access opening ( 3) can be closed with a cover (4) protruding in the shape of a roof, a wall (5) of the base body (1) has a large number of flow openings (6), on the inside of which a filter material (7) is attached in a replaceable manner, furthermore the frame-like recessed section (2 ) merges into a base body base (8) having further flow openings (61), wherein in recesses (9) of the side walls of the recessed section (2) at least one clip-type quick fastening device (10) can be inserted captively in order to mount the filter fan in a frame-like recessed section ( 2) complementary recess (11) of a structure (12), in particular a switch cabinet device or similar means, with at least part of the recess section (2) being inserted into the recess (11) in this regard, so that u rch marked nzeich net, that ss the respective quick-action fastening device (10) has two base surfaces at right angles to one another, designed as long (13) and short (14) legs, with the long leg (13) in the region of one of the recesses (9) on the respective side wall of the set-back section (2) and the short leg (14) is inserted in a form-fitting manner at a free cut (15) of a collar (16) of the set-back section (2), furthermore at the lower end (17) of the long leg (13) in the immersion direction a projecting, transverse web (18) running in the direction of immersion is provided, which engages in a complementary slot (19) in the side wall and, adapted to the material thickness of the side wall, at least one groove (20) is formed on the long leg (13), which has a partial section ( 21) of the side wall in the area of the respective recess, at least two elastic tongues (22) extend on the long leg (13), starting from the web (18) in the direction of the short leg (14), the tongue ends (23) of which are curved back and have a plurality of parallel locking teeth (24) for positive and non-positive hold in the recess (11) of the structure.

2. Filter fan according to claim 1, characterized in that in the region of the collar (16) of the recess section (2) a peripheral seal (25) is formed, which can be brought into contact with the surface of the structure (12).

3. Filter fan according to Claim 1 or 2, characterized in that the base body (1) is designed as a truncated pyramid or trapezoidal body, the access opening (3) of which receives the protruding cover (4), which can be fastened in a self-centering manner on the truncated pyramid or trapezoidal body.

4. Filter fan according to one of the preceding claims, characterized in that in the area between the elastic tongues (22) there is a rigid centering rib (26) set back in relation to the tongues (22) and extending from the short (14) to the long leg (13). extends, is formed.

5. Filter fan according to one of the preceding claims, characterized in that the cover (4) with its projection (41) shields part of the wall (5) of the base body (1) at a distance from this.

6. Filter fan according to one of the preceding claims, characterized in that means for fastening electronic control or regulating devices, in particular thermostats or hydrostats (27) are formed on the base body (8).

7. Filter fan according to one of the preceding claims, characterized in that the inner sides of the wall (5) of the base body (1) have folded tabs (28) for holding the filter material (7).

8. Filter fan according to one of the preceding claims, characterized in that the base body (1) accommodates a stiffening support (29) bridging the wall, on which a fan (30) can be mounted.

9. Control cabinet with a control cabinet roof, which has a recess (11) for receiving a filter fan according to at least one of the preceding claims.