DE10111118B4 - Filter device for equipping a ventilation and / or heating and / or air conditioning, in particular for motor vehicles - Google Patents

Abstract

A filtering device for equipping a ventilation and / or heating and / or air conditioning system, comprising a filter medium (31) comprising pleats and at least partially surrounded by a plastic frame (32) attached to the filter medium (31), said pleats (42) of the filter medium in cross section have a V-shape, wherein the side walls (33, 34, 133) of the frame (32) to the V-shape of the ends of the folds (42) of the filter medium (31) and at least alternately adapt Contain openings so that the ends of the pleats (42) of the filter medium are not clogged, characterized in that the side walls comprise alternately arranged trays whose height is smaller than the height of a fold (42) of the filter medium.

Description

The present invention relates to a filter device for equipping a ventilation, and / or heating and / or air conditioning, in particular for motor vehicles.

Such a device is for example in the publications US 5,667,545 A and US 5,679,122 A described.

In these references, the device includes a pliable filter medium that includes pleats and is surrounded by a frame having two sidewalls and two transverse walls. The sidewalls have an angular shape in cross-section and comprise an intermediate piece and triangular-shaped bottoms which extend over the entire height of the pleats of the filter medium to close the ends of these pleats.

The side walls therefore have a sawtooth shape.

In the publication US 5,667,545 A the frame is rigid, so that the filter device can not be deformed.

In the publication US 5,679,122 A For example, a filtering device has been proposed which can be temporarily or permanently deformed as it is being inserted or removed from a plant to accommodate a non-planar shape of its mounting in the plant.

For this purpose, the intermediate piece comprises thin hinge bands between two consecutive floors. These wristbands can tear off during various manipulations, so that the frame may have a displaced appearance and the filter medium may be subjected to an abnormal manner.

From the EP 0 925 101 B1 For example, a filter device is known which comprises a carded web filter medium in which the fibers have a length between 38 mm and 120 mm and a diameter of more than 10 μm.

A filter device according to the preamble of claim 1 is known from JP 61 074 618 A known. It comprises a filter medium arranged in V-shaped folds in a frame, wherein the side walls of the frame are exactly adapted to the terminal V-shape of the folds and have alternately upwardly and downwardly open opening cross-sections, so that the ends of the folds are not closed are. Although this achieves good flexibility of the frame, which can easily be bent around an axis extending parallel to the longitudinal extent of the folds, the stability of this frame with the zigzag-shaped side walls is only limited.

The present invention has for its object to remedy these disadvantages in a simple and economical manner.

This object is achieved by a filter device according to claim 1. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

It is essential in the solution according to the invention that the side walls of the frame comprise alternately arranged trays whose height is smaller than the height of a fold of the filter medium.

By means of this alternating arrangement of bottoms in the side walls of the frame of the filter device corresponding to the folds of the filter medium, a more stable frame construction is obtained. At the same time, however, despite this improved mechanical strength, the desired flexibility of the filter frame is achieved in that the alternately up and down facing floors only have a lower height than the height of the folds of the filter medium.

Thanks to the invention, and especially thanks to the openings, the filter device is temporarily or permanently deformable when it is inserted into a receptacle with non-planar shape.

The mechanical strength of the filter device is good.

It should be noted that it is not necessary to provide a thin hinge band outside of the filter medium as the frame adapts to the ends of the folds. The filter medium and the side walls of the frame are therefore deformed simultaneously.

It should also be noted that the material consumption is reduced due to the presence of the openings in the frame. In addition, the weight of the filter device decreases as well as their susceptibility.

In one embodiment, the sidewalls have a V-shape, following and thus conforming to the ends of the pleats of the filter media.

In this case, the ends of the folds may be partially closed by alternately arranged half-floors comprising the side walls.

The frame may be attached to the ends of the pleats of the filter medium by gluing, ultrasonic welding, indirect heat welding, etc.

The frame is advantageously attached to the ends of the pleats of the filter medium by molding, which can easily provide a robust attachment and a good control of the thickness of the side walls.

The filter medium advantageously comprises, in view of a low density of the filter medium, a nonwoven mat consisting of a carded web.

The carded web preferably forms a uniform layer.

The filter medium advantageously comprises a flexible grid for good mechanical strength.

The filter medium advantageously comprises gas adsorbents disposed between the grid and said nonwoven mat.

The adsorbents preferably comprise a flexible activated carbon fabric.

Said adsorbents advantageously comprise an activated carbon bed.

A nonwoven mat consisting of a carded web is preferably arranged on both sides of the adsorbent.

Advantageously, a grid is arranged on both sides of the filter medium.

The nonwoven mat is preferably made on the basis of long fibers, the length of which is preferably at least equal to 38 mm.

The said long fibers advantageously have an average diameter greater than or equal to 10 μm.

The said long fibers are preferably made of thermoplastic.

The said long fibers are advantageously polypropylene fibers.

The plastic of the frame is preferably a flexible thermoplastic to further improve the flexibility of the filter device.

The plastic of the frame is advantageously a thermoplastic elastomer.

As a variant, the plastic of the frame is a rigid thermoplastic, such as a talc-containing polypropylene.

The side walls are advantageously connected at one end by a transverse front surface, which is provided with a peripheral edge strip and on the outside with handle means. The transverse front surface carries fastening means.

The side walls are preferably connected at one end by a bottom wall which is formed on the transverse edge of the filter medium.

The side walls and / or the bottom wall are externally provided with an attached seal.

The side walls preferably comprise, in addition to the formation of the V-shaped ends of the folds, two alternately arranged half floors. The alternately arranged half floors are made by molding. As a variant, the alternately arranged half floors are added in the form of inserts.

The side walls advantageously comprise a bar.

The filter device according to the invention is therefore advantageously in the form of a flexible cassette, which can be temporarily deformed when it is inserted into or removed from a ventilation and / or heating and / or air conditioning system, whereby the corresponding work is considerably simplified. especially if the accessibility to receive the filter device in general is not easy.

Further features and advantages of the invention will become apparent from the following description of an embodiment with reference to the accompanying drawings. In it show in detail:

1 a schematic perspective view of a filter device not according to the invention;

2 an enlarged partial view of the section II of 1 ;

the 3 and 4 similar views as 2 , each representing a variant of the invention.

The filter device 30 comprises a flexible filter medium serving as a particle filter 31 , which is advantageously formed by a non-woven mat, which consists of a single-layer carded web. The filter medium 31 is folded.

The said nonwoven mat is designed on the basis of long fibers whose length is preferably at least equal to 38 mm. The said long fibers have a mean diameter greater than or equal to 10 microns. The said fibers are made of thermoplastic, here for economic reasons made of polypropylene.

The nonwoven mat is preferably connected to a flexible grid, for example made of polypropylene. This grid is, based on the flow direction of the air in the filter device 30 , arranged at the back.

The filter medium 31 can be connected to two, also folded, flexible grids.

This or these grid are firmly connected to the nonwoven mat or not. If they are firmly connected to said mat, this firm connection takes place, which can also be carried out only partially, for example by ultrasonic welding, by gluing, by mechanical hardening in particular by means of water jet, or otherwise.

The filter device 30 can form a particulate filter or a so-called combined filter, that is, a combination of particulate filter and gas filter. In this case, gas adsorbents are added.

The said gas adsorbents may comprise an activated carbon bed or a flexible carbon fabric, in the same manner as the filter medium 31 folded.

It is a frame 32 provided whose task is the various components of the filter device 30 and by any means, such as by gluing, ultrasonic welding, indirect heat welding, is attached to the filter medium.

The attachment of the frame 32 on the filter medium takes place here by molding.

In particular, the frame includes 32 two side walls 33 . 34 which are formed by molding to the V-shape of the ends of the folds 42 of the folded filter medium 31 to adjust. The section II of 2 illustrates the increased shaping of the ends of the pleats 42 , the sides of the two walls 33 . 34 forms.

The folds of the filter medium 31 have in cross-section a V-shape with a vertex portion and two spaced apart to the apex portion base portions. There are therefore troughs between the apices of the folds.

On a side designated as the front side are the side walls 33 . 34 at one of its ends by a transverse wall, referred to as a transverse front surface 36 connected, which are parallel to the folds 42 extends and in height and in width relative to the side walls 33 . 34 and to the flexible filter medium 31 survives, so that a peripheral edge strip 37 is defined with the bottom of an opening for the insertion of the filter device 30 can interact, containing the equipment to be equipped. If desired, the insertion of a seal causes a tight interaction.

One from the inside of the cross-face 36 Outgoing survey surrounds here by molding the transverse edge of the filter medium 31 , In the illustrated form, it is the transverse edge of the filter medium 31 around the edge of the total horizontal narrow partition 38 that the last V-shaped fold 42 in the direction of the transverse front surface 36 extended. Lateral connections 43 . 44 Of course, connect the inside of the front surface with the side walls 33 . 36 to also on the longitudinal edges of said narrow partition 38 and the first flank of the first V-shaped fold 42 überzugreifien. On its outside is the cross-front surface 36 with grip means, such as with a tongue 40 , as well as with fastening attachments 45 Mistake.

On the side opposite to the side on which the cross-front surface 36 is attached, covered here called a bottom wall transverse wall 41 by shaping the transverse edge of a narrow partition 39 as well as the narrow curtain wall 38 overall runs horizontally and the last V-shaped fold of the filter medium 31 extended. This bottom wall 41 is intended to cooperate with the bottom of the housing of the equipment to be equipped. It will of course be laterally along side ports 53 . 54 lengthens the longitudinal edges of the narrow partition wall 39 cover.

In the example shown, the side walls are made 33 . 34 Therefore, from a formation of the V-shaped ends of the folds 42 and therefore have even a V-shape, so that the material consumption is reduced accordingly and the frame has a low weight. The solution is simple and economical. Apart from the small dimension of the side walls, the V-shaped ends of the folds 42 not closed by the frame.

The formation of the filter medium 31 can be done using a rigid thermoplastic or a flexible thermoplastic having properties comparable to those of a vulcanized rubber. Regardless of the material, the deformation of the filter device 30 thanks to the caused by the folds natural deformation of the filter medium 31 and thanks to the deformation of the frame 32 , in particular its side walls 33 . 34 allows, for example, to deform in their plane, without the deformation of the filter medium 31 in directions perpendicular to the direction of the folds.

The advantageously carried out by injection molding process allows, as stated above, the inclusion of special functions, such as for attachment. It can also be provided other functions, such as sealing, if it is the plastic used is a flexible plastic.

Different materials can be formed simultaneously, these materials have different properties depending on the required stresses.

As far as the materials are concerned, good results have been obtained with talc-containing polypropylenes or with thermoplastic elastomers, such as the elastomer sold under the MULTFLEX brand by MULTIBASE or sold under the SANTOPRENE brand by Advanced Elastomer Systems, AES.

Thanks to the composition of the filter described above, this has interesting Biegsamkeitseigenschaften that make it possible to bend it for a short time or even screw it to use the filter easier in a heating and / or ventilation and / or air conditioning of a motor vehicle or remove it can. This is particularly advantageous when the accessibility for receiving the filter proves to be difficult, as is very often the case.

In the illustrated form, the side walls 33 . 34 and the bottom wall 41 with a, for example by gluing, attached seal 35 covered. Such a seal 35 may advantageously be a foam gasket. The seal 35 is equal to the crest portions of the folds 42 arranged.

After the variant of 3 include the side walls, such as the side wall 133 , except the formation 33 the V-shaped ends of the folds 42 half floors 63 with triangular overall shape and in an alternating arrangement, the shaping 33 in a transverse plane relative to the folds 42 extend. These half floors 63 are either also by shaping or as a variant by the introduction of inserts in the molding process of the V-shaped ends of the folds 42 produced.

After the variant of 4 includes the sidewall 133 a bar 73 with a small cross-section, which is intended, for example, the filter device 30 to guide in their insertion in the housing, the inside grooves for receiving the said strips 73 or for receiving a seal.

According to a variant not shown, the side walls comprise 33 . 34 of the 1 and 2 also a bar similar to the bar 73 from 4 ,

As it should be easy to understand, the side walls, as used in connection with the 3 and 4 described the filter device 30 their entire flexibility, in connection with the 1 and 2 was pointed out.

In all cases, there are openings in the side walls of the frame so that the ends of the folds 42 of the filter medium are not clogged. These openings are at least alternately distributed.

In 2 are, ignoring the elevation of the side walls 33 . 34 , the interior of the wrinkles and the troughs are not clogged.

In the 3 and 4 the half-floors extend 63 in alternating arrangement. A half-ground 63 closes the inside of a fold 41 at the height of its apex, while a half-ground 63 closing the bottom of each of the aforementioned fold adjacent trough, wherein the two half floors 63 outside the relevant fold 42 and near the base portions of this fold 42 extend. There are therefore openings in the frame in alternating and with the half floors 63 positive arrangement.

There are material strips on the one hand between the half floors 63 that the interior of the folds 42 Close at the level of their apex portions, and on the other hand, the half-floors, which close the bottoms of the base portions of the folds adjacent troughs. In the 3 and 4 These strips of material extend halfway up the folds, since here half floors 63 available. The height of these half floors 63 can of course be reduced and thereby the height of the strips of material can be increased, whereby a deformation of the filter device is made possible.

This reduction may be until the embodiment of the 1 and 2 done at the side walls 33 . 34 have a V shape and the ends of the folds 42 follow the filter medium and therefore adapt to the said wrinkles.

As a variant, the strips of material that make up the floors 63 separate, slightly below or above half the height of the folds 42 be arranged so that the side walls comprise alternately arranged floors having a height which is smaller than the height of a fold 42 of the filter medium.

The design of the non-woven mat, which is the filter medium 31 can be made as follows.

Polypropylene fibers with a fineness of 1.7 dtex (diameter 14 μm) cut to a length of 40 mm are introduced into a mixer.

The fiber mixture obtained is then introduced into an entleaver and then into a storage container before it is carded by a double-take wool carding machine equipped with a random fiber entangler to obtain an isotropic carded web.

Upon leaving the card, the carded web is introduced into a compactor to form a nonwoven ply.

The parameters of the carding and the compressor are chosen so that a nonwoven or nonwoven fabric with a basis weight of about 20 to about 150 g / m ² results.

The nonwoven or nonwoven fabric is placed on a belt and then solidified by a process for water pressure bonding.

The process for water pressure binding is to let through the applied on a rotary drum fleece or non-woven fabric very thin water jets under very high pressure (40 to 200 bar) to pass.

As a result of the bouncing on the drum, the jets of water cause the fibers to become entangled, as a result of which the nonwoven or nonwoven fabric acquires high mechanical strength, without thereby causing a corresponding increase in its density.

After staying in a drying oven, the fleece or non-woven fabric is wound up.

With a 0.84 mm thick nonwoven or nonwoven fabric filter could be formed, which has a basis weight of 66 g / m ² and a density of 0.07.

In order to test the efficiency of the filter produced in this way, it was arranged transversely in a strand with a cross-section equal to 100 cm ² , through which a particle-containing air flow at a speed of 20 cm / s flowed through.

The particles correspond to a powder called "SAE Fine Powder", which is defined by United States Standard No. SAE J 726 / ISO 5011.

The particle concentration is 100 mg / m ³ .

It should be noted on the one hand that the pressure loss during the filter passage under these conditions is only 14 Pa, and on the other hand that the efficiency reaches 80%.

Thanks to these arrangements, a filter medium having a low density, a low manufacturing cost and a high mechanical strength is obtained. This filter medium has a very good flexibility.

As a variant, the fibers of the nonwoven mat can of course also be selected from the group of thermoplastic fibers, such as polyethylene, polyester, polycarbonate and polyamide fibers, etc.

The filter medium may comprise nonwoven fabric layers, between which a flexible reinforcing grid is arranged, wherein the two nonwoven fabric layers at least partially mutually penetrate to firmly connect the system formed by the two layers and the grid.

Claims (27)

Filter device for equipping a ventilation and / or heating and / or air conditioning system, consisting of a filter medium ( 31 ) that includes wrinkles and at least partially of one on the filter medium ( 31 ) fixed frame ( 32 ) is surrounded by plastic, whereby the folds ( 42 ) of the filter medium in cross section have a V-shape, wherein the side walls ( 33 . 34 . 133 ) of the frame ( 32 ) to the V-shape of the ends of the folds ( 42 ) of the filter medium ( 31 ) and at least alternately contain openings so that the ends of the folds ( 42 ) of the filter medium are not clogged, characterized in that the side walls comprise alternately arranged trays whose height is less than the height of a fold ( 42 ) of the filter medium. Filter device according to claim 1, characterized in that the filter medium ( 31 ) comprises a non-woven mat consisting of a carded web. Filter device according to claim 2, characterized in that the carded web forms a uniform layer. Filter device according to one of claims 1 to 3, characterized in that the filter medium ( 31 ) comprises a grid. A filter device according to claims 2 and 4 in combination, characterized in that it comprises gas adsorbents mounted between the grid and said nonwoven mat. Filter device according to claim 5, characterized in that the adsorbent comprises a flexible activated carbon fabric. Filter device according to claim 5, characterized in that said adsorbents comprise an activated carbon bed. Filter device according to one of claims 5 to 7, characterized in that a consisting of a carded web nonwoven mat is disposed on both sides of the adsorbent. Filter device according to one of claims 4 to 8, characterized in that a grid on both sides of the filter medium ( 31 ) is arranged. Filter device according to one of claims 2 to 9, characterized in that the nonwoven mat is designed on the basis of long fibers whose length is preferably at least equal to 38 mm. Filter device according to claim 10, characterized in that said long fibers have an average diameter greater than or equal to 10 microns. Filter device according to one of claims 10 or 11, characterized in that said long fibers are made of thermoplastic. Filter device according to claim 10, characterized in that said long fibers are polypropylene fibers. Filter device according to one of claims 1 to 13, characterized in that the plastic of the frame ( 32 ) is a flexible thermoplastic. Filter device according to claim 14, characterized in that the plastic of the frame ( 32 ) is a thermoplastic elastomer. Filter device according to one of claims 1 to 13, characterized in that the plastic of the frame ( 32 ) is a rigid thermoplastic. Filter device according to claim 16, characterized in that the plastic of the frame ( 32 ) is a talc containing polypropylene. Filter device according to one of claims 14 to 17, characterized in that the side walls ( 33 . 34 . 133 ) at one end by a transverse face ( 36 ) connected to a peripheral edge strip ( 37 ) and on the outside with grip means ( 40 ) is provided. Filter device according to claim 18, characterized in that the transverse front surface ( 36 ) Fastening means ( 45 ) wearing. Filter device according to one of claims 14 to 19, characterized in that the side walls ( 33 . 34 . 133 ) at one end by a bottom wall ( 41 ) connected on the transverse edge of the filter medium ( 31 ) is formed. Filter device according to claim 20, characterized in that the side walls ( 33 . 34 . 134 ) and / or the bottom wall ( 41 ) outside with an attached seal ( 35 ) are provided. Filter device according to one of claims 1 to 21, characterized in that the side walls ( 33 . 34 ) have a V-shape and the ends of the folds ( 42 ) of the filter medium ( 31 ) consequences. Filter device according to claim 22, characterized in that the side walls ( 33 . 34 . 133 ) by molding to the V-shape of the ends of the folds ( 42 ) of the filter medium ( 31 ), so that the frame ( 32 ) made of plastic by molding on the filter medium ( 31 ) is attached. Filter device according to claim 22 or 23, characterized in that the side walls ( 133 ) except the formation ( 33 ) of the V-shaped ends of the folds ( 42 ) alternately arranged half floors ( 63 ). Filter device according to one of the preceding claims, characterized in that the half-floors ( 63 ) are made by molding. Filter device according to one of the preceding claims, characterized in that the half-floors ( 63 ) are added in the form of inserts. Filter device according to one of claims 1 to 26, characterized in that the side walls ( 33 . 34 . 133 ) a bar ( 73 ).

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