Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
  • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
  • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
  • B01D2275/10—Multiple layers

Definitions

• Filter bag for filtering fine particles from a gas
• the invention relates to a filter bag for filtering fine particles from a gas, which has at least one filter layer of a certain layer thickness and at least one downstream in the flow direction of the gas filter layer filter layer of certain layer thickness.
• Such filter bags are used, for example, as dust filter bags in stationary or mobile dedusting devices in industry and household or in ventilation and air conditioning systems application.
• filter materials and filter constructions are known from the prior art, such as two- or three-layer filter bags with an upstream filter layer optionally a downstream intermediate layer and a downstream supporting or carrier layer.
• the individual layers of the multi-layered dust filter bag are for the purpose of providing a high volume of dust collection in a dust collector of Entustaubungsauss very thin and running with each other almost the same layer thickness.
• These thin-layer filters are therefore also referred to as surface filters.
• the invention is therefore based on the object to provide a filter bag with low tendency to clog and thus to improve the service life of the dust filter bag, especially when filtering fine dusts. Disclosure of the invention
• the object is achieved by a dust filter bag, wherein the layer thickness of the filter layer is substantially greater than the layer thickness of the downstream filter layer.
• the layer thickness of the filter layer is substantially greater than the layer thickness of the downstream filter layer.
• the particle capacity of the conventional dust filter bag described in the prior art is without having to accept appreciable Saug sosmanne and without clogging phenomena occur. This effect is particularly effective for very fine dust particles.
• the speed of the dust particles from the exhaust air volume flow is slowed down sufficiently, so that the dust particles in the voluminous filter layer can be well distributed and accumulate and largely do not impinge on the subsequent filter layers prone to clogging.
• the dust filter bag according to the invention realizes, despite its multilayer design a novel depth filter, whereby the life of the dust filter bag is significantly increased.
• the layer thickness of the filter layer according to the invention can also be composed of several filter layers. In this respect, the "layer thickness" in this application is to be understood as the sum of the thicknesses of the individual filter layers.
• the layer thickness of the filter layer is therefore at least 5 times the downstream layer thickness of the filter layer.
• the layer thickness of the filter layer is 15 to 20 times the layer thickness of the downstream filter layer, this is an optimum
• the layer thickness of the filter layer may be 3 mm or more.
• the filter bag has a Staubhellraum, which is completely filled with the filter layer.
• the interior of the filter bag is filled with filter material, which is due to the softness of the filter material sufficient dust receiving space.
• the downstream filter layer has complementary filter functions.
• the downstream filter layer is formed as a carrier layer.
• the supporting effect of Carrier layer combined with a sufficient tear strength gives the filter bag the required stability, so that this the mechanical stress in the air flow without tearing, withstands.
• the carrier layer due to its low basis weight of low intrinsic stability embossed filter material of the filter layer by means of the carrier layer dimensionally stable the mechanical stresses, especially during the pressure increase in the dust filter bag parry, the usually denser material structure of the carrier layer not clogged by the beneficial effect of the filter layer.
• a plurality of downstream filter layers are provided, wherein according to the main claim for each of the filter layers applies that the layer thickness of the filter layer is substantially greater than the layer thickness of the downstream filter layers.
• the main focus is on a voluminous filter layer with respect to the downstream filter layers, wherein the advantageous property of the filter layer is supported by the functions of the downstream filter layers.
• the filter layer is kept dimensionally stable by a carrier layer, for example, a favorable combination of filter layers with filter materials having different filter properties, for example with regard to average fiber diameter, electrostatic charge, basis weight and air permeability, increases the overall filter performance and thus the service life of the filter bag according to the invention.
• the filter layer can be easily moved and vibrated by the flow of the gas through the dust filter bag, so that one on the surface of the Filter layer deposited particle stratification can be shaken off into the filter bag interior and the depth filter property of the filter layer according to the invention is largely not blocked.
• the filter layer is limited in its form flexibility by the downstream filter layer on which the filter layer under the delivery pressure of the flow applies, so that it is not exposed to tensile stress.
• the filter layer consists of meltblown nonwoven.
• Meltblown nonwoven is a superfine nonwoven fabric made from a thermoplastic polymer in a meltblown process and has a particularly high air permeability at a low basis weight. It also has an excellent separation efficiency for fine dusts with low flow resistance, so that it is particularly well suited for a voluminous filter layer according to the invention.
• this meltblown fleece has a very low rigidity, so that it can be easily inserted into the filter bag and can be adapted to any desired outer shape of the filter bag.
• FIG. 1 shows a layer structure of a dust filter bag in a schematic sectional view and in
• Fig. 2 is a sectional view through the dust filter bag.
• the application possibilities of the filter bag according to the invention not only concern dust filter bags for the dust compact household vacuum cleaner with a dust container volume of 1 to 5 liters but also, for example, large dust bags for mobile or stationary industrial vacuum cleaner (wet / dry vacuum) with high flow rates, where dust container volume of 50 liters and more can be found are.
• a dust filter bag of an industrial vacuum cleaner will be described by way of example.
• the layer structure of the dust filter bag according to the invention according to FIG. 1 consists of a voluminous filter layer 1 of meltblown nonwoven, an intermediate layer 3, which is downstream of the suction stream of the filter layer 1 in the flow direction 2 and from a further in the flow direction 2 of the suction downstream carrier layer 4.
• This is the layer thickness Di of the filter layer 1 is substantially greater than the layer thickness D 3 of the intermediate layer 3 or as the layer thickness D 4 of the carrier layer 4.
• the layer thickness Di of the filter layer. 1 18 times greater than the layer thickness D 3 of the intermediate layer 3 and the layer thickness D 4 of the carrier layer 4.
• the extremely thick filter layer 1 of meltblown nonwoven is therefore very voluminous, yet has a high air permeability.
• the filter volume gained it is possible to take a multiple of the particles 5, originally with dust filter bags were detectable according to the prior art.
• a dust filter bag according to the invention with a filling volume of 3 liters achieves a 10 times longer service life than conventional filters according to the prior art.
• the capacity of the dust filter bag increases from approx. 50 g up to 500g sanding dust. With the increased life of the dust filter bag, the continuous grinding time can be extended from 3 minutes to over 30 minutes.
• the gypsum particles 5 conveyed with the air volume flow are decelerated and absorbed in the voluminous filter layer 1, which reduces an impact of the gypsum particles 5 on the subsequent filter layers, in particular on the structurally denser carrier layer 4.
• the intermediate layer 3 and carrier layer 4 is kept away from blockages, while the flow resistance increases only slightly overall, so that the suction power is only imperceptibly impaired.
• the outer carrier layer 4 provides with its supporting effect the required dimensional stability and tensile strength of erfindunlicen dust filter bag with the very soft and voluminous filter layer 1, wherein the carrier layer 4 in addition to the intermediate layer 3, as shown in the embodiment of FIG. 2 can be connected. Furthermore, it can be seen that the filter layer 1 loose on the
• Interlayer 3 is added and is connected only to the folding edges 6 with the filter layers 3,4, which in addition the above-described, advantageous mobility of the filter layer 1 is realized in the dust filter bag.

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• 2006
  • 2006-08-16 DE DE102006038440A patent/DE102006038440A1/de not_active Withdrawn
• 2007
  • 2007-08-01 EP EP07788114A patent/EP2054138A1/de not_active Ceased
  • 2007-08-01 CN CNA2007800294709A patent/CN101522283A/zh active Pending
  • 2007-08-01 US US12/159,290 patent/US20090000256A1/en not_active Abandoned
  • 2007-08-01 WO PCT/EP2007/057943 patent/WO2008019944A1/de active Application Filing
  • 2007-08-01 RU RU2009109351/05A patent/RU2009109351A/ru not_active Application Discontinuation

Non-Patent Citations (1)

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