EP2414066A1 - Filter device and gas generator having a filter device - Google Patents

Filter device and gas generator having a filter device

Info

Publication number
EP2414066A1
EP2414066A1 EP10716305A EP10716305A EP2414066A1 EP 2414066 A1 EP2414066 A1 EP 2414066A1 EP 10716305 A EP10716305 A EP 10716305A EP 10716305 A EP10716305 A EP 10716305A EP 2414066 A1 EP2414066 A1 EP 2414066A1
Authority
EP
European Patent Office
Prior art keywords
filter
sheet metal
filter device
material web
filter material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10716305A
Other languages
German (de)
French (fr)
Inventor
Gerrit Von Breitenbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Takata AG
Original Assignee
Takata Petri AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Takata Petri AG filed Critical Takata Petri AG
Publication of EP2414066A1 publication Critical patent/EP2414066A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • B01D45/06—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by reversal of direction of flow
    • 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
    • B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
    • B01D46/0041—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
    • B01D46/0043—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding containing fixed gas displacement elements or cores
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • 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
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • 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
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/528—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/261—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow with means other than bag structure to diffuse or guide inflation fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/10—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air bags, e.g. inflators therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26011—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a filter through which the inflation gas passes

Definitions

  • the invention relates to a filter device for filtering a gas flow according to the preamble of claim 1 and a gas generator with such a filter device.
  • a filter device in which a filter element consisting of a plurality of filter material layers of different permeability is formed as a wound body, which is formed by winding a filter material web. This filter sections are provided with different permeability.
  • the document DE 10 2004 032 609 B4 describes a filter and cooling unit in which a plurality of disc-shaped, metallic filter individual elements are stacked to form a filter.
  • baffles it is further known to combine filtering with baffles to improve filter use in gas generators from both a thermal and particle retention standpoint, which are used to direct the gas flow generated by a gas generator through the filter and thus improve filter utilization.
  • Such arrangements which are also referred to as “baffled filter” or “bsffled filter design”, are realized in conjunction with wire knit filters, which, however, are expensive to manufacture and relatively expensive. Also, it is difficult in the manufacturing process to control the uniformity of the knitted wire over the circumference and length of the filter. In addition, the assembly of the baffles means an extra effort.
  • the present invention has for its object to provide a filter device and a gas generator available, which allow a good filter use through the use of baffles, but are easy to produce. This object is achieved by a filter device with the features of claim 1 and a gas generator with the features of claim 15. Embodiments of the invention are specified in the subclaims.
  • the solution according to the invention provides a filter device which is produced by a wound or folded filter material web.
  • a filter material web is connected to a closed sheet metal section or forms such.
  • the closed sheet metal section has at least one recess for the inflow or outflow of gas into or out of the filter device.
  • the solution according to the invention allows the use of conventional wound filters, which are formed for example from expanded metal sheets.
  • baffles are integrated into the filter, which direct a gas flow directed through the filter and thereby improve the filter use both in thermal and in particle retention technology point of view.
  • the guide elements designed as sheet metal sections of the filter material web do not have to be mounted separately, since they are integrated into the filter material web or connected to it so that the sheets are automatically suitably positioned during winding or folding of the filter material web.
  • a filter device with integrated baffles and without the need for separate baffle components and their assembly is provided.
  • Openings direct a gas flow directed through the filter and thus the
  • the actual filter can be made from conventional wound filters without the need to resort to relatively expensive and expensive wire mesh filters.
  • the filters are formed from expanded metal sheets or stamped or embossed or textured sheets.
  • the filter material web may consist of one or more layers of such sheets, which are then wound together.
  • the solution according to the invention has the further advantage that there is only little installation effort, since the baffles do not have to be arranged and mounted separately. By eliminating your own baffle components is beyond also given a weight saving. Also can be done by reducing the number of parts quality monitoring with reduced effort.
  • the wound filter material web forms a hollow cylindrical winding body of the filter device, wherein a closed sheet metal section forms the inner or outer circumferential surface of the winding body or at least a part thereof.
  • the hollow cylindrical winding body is thereby flowed through radially from the inside to the outside of a gas stream to be cleaned.
  • both ends of the filter material web are each connected to a closed sheet metal section.
  • one of the sheet-metal sections forms the inner and the other sheet-metal section the outer lateral surface of the hollow-cylindrical winding body.
  • the radial flow of the gas stream to be cleaned from the inside to the outside in the hollow cylindrical winding body can thereby be added a component directed in the longitudinal direction of the winding body by the recesses in the two sheet metal sections being offset from one another.
  • recesses in the sheet metal sections may be formed, for example, as holes and / or as marginal material omissions or indentations. It should be noted that such recesses only serve the directional supply or the directed outflow of gas into or out of the filter device.
  • the recesses are due to their number and / or size not suitable to form a filter element itself. It is essentially closed baffles, which adjoin the actual filter material of the filter material web.
  • the one or more sheet metal sections constitute separately produced parts which are connected to the filter material web. For this example, they are welded to the filter material web. However, it is also within the scope of the invention that the one or more sheet metal sections are formed integrally with the filter material web.
  • the filter device has a metal strip which is punched and / or embossed in the region of the filter material web and / or forms three-dimensional structural elements, so that the filter material web acts as a filter in the wound state.
  • the metal strip is formed closed in the region of the sheet metal sections except for the at least one recess for the inflow or outflow of gas and forms a guide plate for the gas to be cleaned. Also, a plurality of such metal strips can be arranged one above the other and wound together.
  • the invention further relates to a gas generator of a vehicle occupant protection device having a filter according to claim 1.
  • a filter is arranged for example in a cylindrical generator housing.
  • Fig. 1A is a flat spread filter material web with integrated gas baffles in plan view
  • Fig. 1B in a sectional view of the wound filter material web of Figure 1A, which forms a hollow cylindrical winding body.
  • Fig. 2A shows a spread filter material web according to the prior art
  • FIG. 2B shows the filter material web of FIG. 2A in the wound state
  • Fig. 3A, 3B embodiments of integrated gas baffles, in which recesses for inflow or outflow of gas as an edge
  • FIG. 5A, 5B embodiments of integrated gas baffles in which
  • Fig. 6 in plan view an alternative embodiment of a filter material web formed by punched round holes
  • FIG. 7 in plan view another alternative embodiment of a
  • Filter material web formed by triangular punched holes
  • FIG. 8 in side view another alternative embodiment of a
  • a filter material web formed by a sheet having an embossed structure
  • FIG. 9 is a sectional view of a further embodiment of a filter material web, which is formed by a structural sheet with three-dimensional structural elements;
  • FIG. 10 is a sectional view of another embodiment of a filter material web, which is formed by a structural sheet with punched Hutzen;
  • FIG. 1 1 in sectional view a first embodiment of a gas generator with a wound filter device according to FIG. 1 B and
  • FIG. 12 is a sectional view of a second embodiment of a gas generator with a wound filter device according to FIG. 1 B.
  • FIG. 2A shows a rolled, flat-spread filter material web 10 'with rectangular dimensions.
  • a hollow cylindrical winding body V is formed, which forms the filter and is shown in FIG. 2B.
  • the air passage through the hollow cylindrical winding body takes place in the radial direction, as indicated by the arrows of Figure 2B.
  • the filter material web consists of a conventional filter material such as an expanded metal strip. This can be formed in one or more layers. By winding the expanded metal strip, the filter of FIG. 2B is formed.
  • expanded metal is generally understood to mean a material having openings in the surface, which have been produced by staggered cuts without loss of material while at the same time stretching.
  • the meshes of such a lattice-like material are neither braided nor welded.
  • expanded metal is also used.
  • FIG. 1A shows a rolled-out, longitudinally spread filter 1.
  • the filter 1 has a filter material web 10, which may consist of any rollable filter material.
  • the filter material web 10 consists of one or more expanded metal sheets joined together.
  • the filter material web 10 is formed rectangular and has two narrow sides or ends 1 1, 12.
  • the filter 1 further comprises two closed sheet metal sections 30, 40, which are respectively attached to the ends 1 1, 12 of the filter material web 1. This is done for example by welding.
  • the sheet metal sections 20, 30 have the same width as the filter material web 10, so that the filter material web 10 and the sheet metal sections 20, 30 together form an elongated, rectangular filter web.
  • the closed sheet metal sections 20, 30 are thus integrated components of the filter 1.
  • each recesses 40, 50 are formed in the sheet metal sections 20, 30 of the filter 1 .
  • the recesses are formed as a plurality of circular holes 40, 50 extending along the bottom edge of one sheet portion 20 and the top edge of the other sheet portion 30 along a straight line, respectively. As will be explained, these recesses 40, 50 serve the defined inflow or outflow of gas into the filter 1.
  • Figure 1 B shows the wound filter 1, which is formed by winding the filter web of Figure 1 A. It should be noted that the sheet metal sections 20, 30 of the filter web be wrapped. During the winding process, a hollow cylindrical winding body forms, which forms the filter 1. Due to the winding also of the sheet metal sections 20, 30, the inner circumferential surface of the hollow cylindrical body is formed by the one sheet metal section 30 and the outer circumferential surface of the hollow cylindrical body by the other sheet metal section 20.
  • the offset between the openings 40, 50 results in that shown in FIG. 1 B gas generated inside the hollow cylinder first enters through the openings 50 of a sheet metal portion 30 radially outwardly into the filter, then in addition to a radially outward movement undergoes movement in the longitudinal direction of the filter axis 7 and then leaves through the openings 40 in the outer plate portion 20 in the radial direction of the filter.
  • the gas flow is thus directed and compared to a purely radial flow with a longer filter path through the filter 1, so that there is an improved filter use. This is the case both in thermal terms and in terms of particulate retention, since the longer passage of the gas to be cleaned through the filter 1 makes possible, on the one hand, improved heat transfer to the filter and, on the other hand, better particle retention.
  • the sheet metal sections 20, 30 thus provide baffles which direct the gas flow through the filter 1 and which are an integral part of the filter 1. With manufacture of the filter from the filter web of Fig. 1A, the baffles 20, 30 are automatically provided and aligned.
  • the length of a sheet metal section 20, 30 substantially corresponds to the circumferential length of the hollow cylindrical formed from the filter web
  • regions of a sheet metal section 20, 30 do not overlap.
  • Length has such that it forms overlapping areas after the winding process.
  • the openings formed in the sheet metal section are in this case preferably aligned such that they are aligned with one another in the sections lying one above the other.
  • Figures 3A, 3B, 4A, 4B and 5A, 5B show different embodiments of integrated gas baffles.
  • recesses 41, 51, 42, 52, 43, 53 in sheet metal sections 21, 31, 22, 32, 23, 33 are provided, which are offset from each other, so that a directed, not purely radially aligned gas flow through the filter ,
  • the recess for the inflow or outflow of gas into the filter is designed as edge-side material outlet 41, 51.
  • the respective sheet metal section 21, 31 has for this purpose adjacent to the filter material web 10 has a smaller width compared to the width of the filter material web 10.
  • the recesses 42, 52 for the inflow or outflow of gas are likewise formed on the edge side on the sheet-metal section.
  • the recesses 42, 52 are provided as a zigzag edge with corresponding notches.
  • Edge-side recesses 41, 51, 42, 52 according to FIGS. 3A, 3B, 4A, 4B have the advantage of a relatively simple production.
  • FIGS. 5A, 5B in the sheet-metal sections 23, 33, similar to the embodiment of FIGS. 1A, 1B, circular holes 43, 53 are formed, each extending along a line extending in the longitudinal direction of the sheet-metal section.
  • a centrally arranged row of holes 43 is provided in one sheet metal section 23.
  • two edge rows of holes 53 are provided in the other sheet section 33. This ensures that the gas flow in the filter branches and flows, for example, from the centrally arranged holes 43 both upwards and downwards to the holes 53.
  • FIGS. 6 to 10 show alternative embodiments of the semifinished products for producing wound filters according to the invention. It should be noted in advance that in Figures 6 to 10, the lateral closed sheet metal sections are not shown separately. However, these are also present in these embodiments, but formed integrally with the actual filter material web. The training can be carried out according to the figures 1A to 5B.
  • a section of the unrolled filter qualifies as a filter material or as a gas guide plate as a function of whether filter structures are formed in the semifinished product or not.
  • the gas guide plates forming sheet metal sections no filter structures are provided. Rather, it is closed sheet metal sections, which have only recesses for inflow or outflow of gas.
  • a perforated plate 13 with punched holes 131 is provided as semifinished product for producing a wound filter, which are formed, for example, but not necessarily, round.
  • the punched holes are formed only in the region of the filter material web 13, not in the (not shown) closed sheet metal sections.
  • the filter material web is formed as a perforated plate 14 with punched holes in the form of triangles 141. Other form punching are of course also possible.
  • the filter material web 15 has an embossed structure with a wall thickness change ⁇ t in the sheet-metal plane direction. Due to the change in wall thickness arise in the wound sheet metal channels for gas flow in the filter.
  • the filter material web 16 is designed as a structural sheet having three-dimensional miniature structural elements 161. These can be formed on one or two sides, drawn, profiled, rolled, hydroformed, etc.
  • the structural elements 161 again create channels for air conduction in the filter.
  • FIG. 10 shows an exemplary embodiment in which a filter material web 17 punched out 171 forms, wherein the shrouds 171 both form three-dimensional miniature structural elements and openings 172 provide.
  • the sheets may be, for example, steel sheets, aluminum sheets or copper sheets.
  • the described filter 1 with integrated gas baffles 20, 30 can basically be used in any context, for example in household technology or rocket technology.
  • a preferred implementation is in a gas generator of a vehicle occupant protection device. Examples of such implementations are shown in FIGS. 11 and 12.
  • FIG. 11 shows a sectional view of a rotationally symmetrical gas generator 100 which has a generator housing 101 consisting of a generator pot 102 and a generator cap 103 connected thereto.
  • a combustion chamber 1 10 is formed, in which a Anzündelement 120, a Anzündladung and fuel means (not shown) are arranged.
  • the interior of the gas generator 100 which is shown only schematically in FIG. 11, can be subdivided into a plurality of chambers, for example a centrally arranged ignition chamber to which the actual combustion chamber and subsequently a deposition chamber adjoin.
  • the exact structure of the gas generator 100 is not important here.
  • a wound filter 200 is arranged, which is formed, for example, according to the figures 1 A, 1 B.
  • the filter 200 comprises a windable filter material 210, an inner integrated baffle 220, and an outer integrated baffle 230.
  • the inner integrated baffle 220 lower recesses 221 and in the outer integrated baffle 230 upper recesses 231 realized.
  • the exemplary embodiment of FIG. 12 differs from the exemplary embodiment of FIG. 11 in that the generator pot 102 is flatter and the generator cap 103 extends more strongly in the direction of the generator pot 102 for compensation.
  • the gas guide A ' is such that the exhaust openings 130 are formed in the generator cover 103 in the upper region of the generator housing.
  • the invention is not limited in its embodiment to the embodiments shown above.
  • the integrated baffles may have a different shape than shown and / or otherwise be provided with recesses for entry or outflow of gas into or out of the filter.
  • the invention is not limited to certain filter materials as long as they are windable. It can also be provided that the filter has no wound, but instead folded filter material webs. It then applies again that the ends of the folded filter material are formed as closed sheet metal sections for the realization of baffles.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Air Bags (AREA)

Abstract

The invention relates to a filter device for filtering a gas stream having a wound or folded filter material web. According to the invention, at least one end (11, 12) of the filter material web (10) has a section or is connected to a section that is formed by a closed sheet metal section (20, 30), wherein the closed sheet metal section (20, 30) has at least one recess (40, 50) for streaming gas in or out of the filter device (1).

Description

Filtervorrichtung und Gasgenerator mit einer Filtervorrichtung Filter device and gas generator with a filter device
Beschreibungdescription
Die Erfindung betrifft eine Filtervorrichtung zum Filtern einer Gasströmung gemäß dem Oberbegriff des Anspruchs 1 und einen Gasgenerator mit einer solchen Filtervorrichtung.The invention relates to a filter device for filtering a gas flow according to the preamble of claim 1 and a gas generator with such a filter device.
Aus der Druckschrift EP 0 552 706 B1 ist eine Filtervorrichtung bekannt, bei der ein aus mehreren Filtermateriallagen unterschiedlicher Durchlässigkeit bestehendes Filterelement als Wickelkörper ausgebildet ist, der durch Wickeln einer Filtermaterialbahn gebildet ist. Dabei werden Filterabschnitte mit unterschiedlicher Durchlässigkeit bereitgestellt.From the document EP 0 552 706 B1 a filter device is known, in which a filter element consisting of a plurality of filter material layers of different permeability is formed as a wound body, which is formed by winding a filter material web. This filter sections are provided with different permeability.
Die Druckschrift DE 10 2004 032 609 B4 beschreibt eine Filter- und Kühleinheit, bei der eine Mehrzahl scheibenförmiger, metallischer Filtereinzelelemente zu einem Filter gestapelt sind.The document DE 10 2004 032 609 B4 describes a filter and cooling unit in which a plurality of disc-shaped, metallic filter individual elements are stacked to form a filter.
Es ist weiter bekannt, zur Verbesserung der Filternutzung in Gasgeneratoren sowohl aus thermischer als auch aus partikelrückhaltetechnischer Sicht Filter mit Leitblechen zu kombinieren, die derart eingesetzt werden, dass sie den durch einen Gasgenerator erzeugten Gasstrom gerichtet durch den Filter hindurchleiten und somit die Filternutzung verbessern. Derartige Anordnungen, die auch als „Baffled Filter" oder „Bsffled Filter Design" bezeichnet werden, werden in Verbindung mit Drahtgestrickfiltern realisiert, die jedoch aufwändig in der Herstellung und relativ teuer sind. Auch ist es im Herstellungsprozess schwierig, die Gleichmäßigkeit des Drahtgestrickes über den Umfang und die Länge des Filters zu kontrollieren. Zusätzlich bedeutet die Montage der Leitbleche einen zusätzlichen Aufwand.It is further known to combine filtering with baffles to improve filter use in gas generators from both a thermal and particle retention standpoint, which are used to direct the gas flow generated by a gas generator through the filter and thus improve filter utilization. Such arrangements, which are also referred to as "baffled filter" or "bsffled filter design", are realized in conjunction with wire knit filters, which, however, are expensive to manufacture and relatively expensive. Also, it is difficult in the manufacturing process to control the uniformity of the knitted wire over the circumference and length of the filter. In addition, the assembly of the baffles means an extra effort.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Filtervorrichtung und einen Gasgenerator zur Verfügung zu stellen, die eine gute Filternutzung durch die Verwendung von Leitblechen ermöglichen, dabei jedoch einfach herstellbar sind. Diese Aufgabe wird erfindungsgemäß durch eine Filtervorrichtung mit den Merkmalen des Anspruchs 1 und einen Gasgenerator mit den Merkmalen des Anspruchs 15 gelöst. Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The present invention has for its object to provide a filter device and a gas generator available, which allow a good filter use through the use of baffles, but are easy to produce. This object is achieved by a filter device with the features of claim 1 and a gas generator with the features of claim 15. Embodiments of the invention are specified in the subclaims.
Danach sieht die erfindungsgemäße Lösung eine Filtervorrichtung vor, die durch eine gewickelte oder gefaltete Filtermaterialbahn hergestellt ist. Dabei ist zumindest ein Ende der Filtermaterialbahn mit einem geschlossenen Blechabschnitt verbunden oder bildet einen solchen aus. Der geschlossene Blechabschnitt weist mindestens eine Aussparung zum Ein- oder Ausströmen von Gas in die oder aus der Filtervorrichtung auf.Thereafter, the solution according to the invention provides a filter device which is produced by a wound or folded filter material web. In this case, at least one end of the filter material web is connected to a closed sheet metal section or forms such. The closed sheet metal section has at least one recess for the inflow or outflow of gas into or out of the filter device.
Die erfindungsgemäße Lösung erlaubt die Verwendung konventioneller gewickelter Filter, die beispielsweise aus Streckmetallblechen gebildet sind. Mit den geschlossenen Blechabschnitten werden Leitbleche in den Filter integriert, der einen Gasstrom gerichtet durch den Filter hindurchleiten und hierdurch die Filternutzung sowohl in thermischer als auch in partikelrückhaltetechnischer Sicht verbessern. Die als Blechabschnitte der Filtermaterialbahn ausgebildeten Leitelemente müssen dabei nicht gesondert montiert werden, da sie in die Filtermaterialbahn integriert oder mit dieser verbunden sind, so dass bei einem Wickeln oder Falten der Filtermaterialbahn die Bleche automatisch geeignet positioniert werden. Damit wird eine Filtervorrichtung mit integrierten Leitblechen und ohne die Notwendigkeit separater Leitblechkomponenten und deren Montage bereitgestellt.The solution according to the invention allows the use of conventional wound filters, which are formed for example from expanded metal sheets. With the closed sheet metal sections baffles are integrated into the filter, which direct a gas flow directed through the filter and thereby improve the filter use both in thermal and in particle retention technology point of view. The guide elements designed as sheet metal sections of the filter material web do not have to be mounted separately, since they are integrated into the filter material web or connected to it so that the sheets are automatically suitably positioned during winding or folding of the filter material web. Thus, a filter device with integrated baffles and without the need for separate baffle components and their assembly is provided.
Die erfindungsgemäße Lösung führt zu einer verbesserten Filternutzung, da die integrierten Blechabschnitte über die in diesen ausgebildeten Aussparungen oderThe solution according to the invention leads to an improved use of filters, since the integrated sheet-metal sections via the recesses formed in these or
Öffnungen einen Gasstrom gerichtet durch den Filter hindurchleiten und damit dieOpenings direct a gas flow directed through the filter and thus the
Filternutzung verbessern. Gleichzeitig kann der eigentliche Filter aus konventionellen gewickelten Filtern hergestellt werden, ohne die Notwendigkeit, auf relativ teure und aufwändige Drahtgestrickfilter zurückgreifen zu müssen. Beispielsweise sind die Filter aus Streckmetallblechen oder gestanzten oder geprägten oder mit Strukturen ausgebildeten Blechen gebildet. Dabei kann die Filtermaterialbahn aus einer oder mehreren Lagen solcher Bleche bestehen, die dann gemeinsam gewickelt werden.Improve filter usage. At the same time, the actual filter can be made from conventional wound filters without the need to resort to relatively expensive and expensive wire mesh filters. For example, the filters are formed from expanded metal sheets or stamped or embossed or textured sheets. In this case, the filter material web may consist of one or more layers of such sheets, which are then wound together.
Die erfindungsgemäße Lösung weist den weiteren Vorteil auf, dass ein nur geringer Montageaufwand besteht, da die Leitbleche nicht gesondert angeordnet und montiert werden müssen. Durch den Wegfall eigener Leitblechkomponenten ist darüber hinaus auch eine Gewichtseinsparung gegeben. Auch kann durch die reduzierte Teilzahl eine Qualitätsüberwachung mit reduziertem Aufwand erfolgen.The solution according to the invention has the further advantage that there is only little installation effort, since the baffles do not have to be arranged and mounted separately. By eliminating your own baffle components is beyond also given a weight saving. Also can be done by reducing the number of parts quality monitoring with reduced effort.
Die gewickelte Filtermaterialbahn bildet einen hohlzylindrischen Wickelkörper der Filtervorrichtung, wobei ein geschlossener Blechabschnitt die innere oder äußere Mantelfläche des Wickelkörpers oder zumindest einen Teil derselben bildet. Der hohlzylindrische Wickelkörper wird dabei radial von innen nach außen von einem zu reinigenden Gasstrom durchströmt.The wound filter material web forms a hollow cylindrical winding body of the filter device, wherein a closed sheet metal section forms the inner or outer circumferential surface of the winding body or at least a part thereof. The hollow cylindrical winding body is thereby flowed through radially from the inside to the outside of a gas stream to be cleaned.
In einer Ausgestaltung sind beide Enden der Filtermaterialbahn jeweils mit einem geschlossenen Blechabschnitt verbunden. Grundsätzlich ist es jedoch auch möglich, lediglich ein Ende der Filtermaterialbahn mit einem geschlossenen Blechabschnitt zu verbinden, wobei dann entweder auf ein Leitblech im Bereich des anderen Endes der Filtermaterialbahn verzichtet oder ein solches in herkömmlicher Weise gesondert montiert wird.In one embodiment, both ends of the filter material web are each connected to a closed sheet metal section. In principle, however, it is also possible to connect only one end of the filter material web to a closed sheet metal section, in which case either a guide plate in the region of the other end of the filter material web is omitted or such is separately mounted in a conventional manner.
Sofern zwei geschlossene Blechabschnitte als Leitbleche vorgesehen sind, bildet der eine Blechabschnitt die innere und der andere Blechabschnitt die äußere Mantelfläche des hohlzylindrischen Wickelkörpers. Der radialen Strömung des zu reinigenden Gasstroms von innen nach außen im hohlzylindrischen Wickelkörper kann dabei eine in Längsrichtung des Wickelkörpers gerichtete Komponente hinzugefügt werden, indem die Aussparungen in den beiden Blechabschnitten versetzt zueinander ausgebildet sind.If two closed sheet-metal sections are provided as baffles, one of the sheet-metal sections forms the inner and the other sheet-metal section the outer lateral surface of the hollow-cylindrical winding body. The radial flow of the gas stream to be cleaned from the inside to the outside in the hollow cylindrical winding body can thereby be added a component directed in the longitudinal direction of the winding body by the recesses in the two sheet metal sections being offset from one another.
Was die Ausgestaltung der Aussparungen angeht, sind hier zahlreiche Realisierungsmöglichkeiten denkbar. Es kommt lediglich darauf an, einen Lufteintritt in den eigentlichen Filter in definierter Weise zu ermöglichen. Entsprechende Aussparungen in den Blechabschnitten können beispielsweise als Löcher und/oder als randseitige Materialauslassungen oder Einkerbungen ausgebildet sein. Dabei ist zu beachten, dass solche Aussparungen lediglich der gerichteten Zufuhr bzw. dem gerichteten Ausströmen von Gas in die oder aus der Filtervorrichtung dienen. Die Aussparungen sind aufgrund ihrer Anzahl und/oder ihrer Größe nicht geeignet, selbst ein Filterelement zu bilden. Es handelt sich um im Wesentlichen geschlossene Leitbleche, die an das eigentliche Filtermaterial der Filtermaterialbahn angrenzen.As far as the design of the recesses is concerned, numerous implementation possibilities are conceivable here. It is only important to allow air to enter the filter itself in a defined manner. Corresponding recesses in the sheet metal sections may be formed, for example, as holes and / or as marginal material omissions or indentations. It should be noted that such recesses only serve the directional supply or the directed outflow of gas into or out of the filter device. The recesses are due to their number and / or size not suitable to form a filter element itself. It is essentially closed baffles, which adjoin the actual filter material of the filter material web.
In einer Ausgestaltung der Erfindung ist vorgesehen, dass der oder die Blechabschnitte gesondert hergestellt Teile darstellen, die der Filtermaterialbahn verbunden sind. Hierzu werden Sie beispielsweise mit der Filtermaterialbahn verschweißt. Es liegt jedoch ebenso im Rahmen der Erfindung, dass der oder die Blechabschnitte einstückig mit der Filtermaterialbahn ausgebildet sind.In one embodiment of the invention it is provided that the one or more sheet metal sections constitute separately produced parts which are connected to the filter material web. For this For example, they are welded to the filter material web. However, it is also within the scope of the invention that the one or more sheet metal sections are formed integrally with the filter material web.
Im letzteren Fall ist beispielsweise vorgesehen, dass die Filtervorrichtung einen Blechstreifen aufweist, der im Bereich der Filtermaterialbahn gestanzt und/oder geprägt ist und/oder dreidimensionale Strukturelemente ausbildet, so dass die Filtermaterialbahn im gewickelten Zustand als Filter wirkt. Dagegen ist der Blechstreifen im Bereich der Blechabschnitte bis auf die mindestens eine Aussparung zum Ein- oder Ausströmen von Gas geschlossen ausgebildet und bildet ein Leitblech für das zu reinigende Gas. Auch können mehrere solcher Blechstreifen übereinander angeordnet und gemeinsam gewickelt sein.In the latter case, for example, it is provided that the filter device has a metal strip which is punched and / or embossed in the region of the filter material web and / or forms three-dimensional structural elements, so that the filter material web acts as a filter in the wound state. In contrast, the metal strip is formed closed in the region of the sheet metal sections except for the at least one recess for the inflow or outflow of gas and forms a guide plate for the gas to be cleaned. Also, a plurality of such metal strips can be arranged one above the other and wound together.
Die Erfindung betrifft des Weiteren einen Gasgenerator einer Fahrzeuginsassen- Schutzvorrichtung, die einen Filter gemäß dem Anspruch 1 aufweist. Ein solcher Filter ist beispielsweise in einem zylindrischen Generatorgehäuse angeordnet. In einerThe invention further relates to a gas generator of a vehicle occupant protection device having a filter according to claim 1. Such a filter is arranged for example in a cylindrical generator housing. In a
Brennkammer des Gasgenerators erzeugte Gase durchströmen den Filter und verlassen das Generatorgehäuse gereinigt durch in diesem ausgebildeteGas generated by the combustion chamber of the gas generator flow through the filter and leave the generator housing cleaned by trained in this
Ausblasöffnungen.Exhaust openings.
Die Erfindung wird nachfolgend unter Bezugnahme der Figuren der Zeichnung anhand mehrerer Ausführungsbeispiele näher erläutert. Es zeigen:The invention will be explained in more detail below with reference to the figures of the drawing with reference to several embodiments. Show it:
Fig. 1A eine flach ausgebreitete Filtermaterialbahn mit integrierten Gasleitblechen in Draufsicht;Fig. 1A is a flat spread filter material web with integrated gas baffles in plan view;
Fig. 1 B in Schnittansicht die gewickelte Filtermaterialbahn der Fig. 1A, die einen hohlzylindrischen Wickelkörper ausbildet;Fig. 1B in a sectional view of the wound filter material web of Figure 1A, which forms a hollow cylindrical winding body.
Fig. 2A eine ausgebreitete Filtermaterialbahn gemäß dem Stand der Technik;Fig. 2A shows a spread filter material web according to the prior art;
Fig. 2B die Filtermaterialbahn der Fig. 2A im gewickelten Zustand;FIG. 2B shows the filter material web of FIG. 2A in the wound state; FIG.
Fig. 3A, 3B Ausgestaltungen von integrierten Gasleitblechen, bei denen Aussparungen zum Ein- oder Ausströmen von Gas als randseitigeFig. 3A, 3B embodiments of integrated gas baffles, in which recesses for inflow or outflow of gas as an edge
Materialauslassungen ausgebildet sind; Fig. 4A, 4B Ausgestaltungen von integrierten Gasleitblechen, bei denenMaterial omissions are formed; 4A, 4B embodiments of integrated gas baffles in which
Aussparungen zum Ein- oder Ausströmen von Gas als randseitigeRecesses for inflow or outflow of gas as edge-side
Einkerbungen ausgebildet sind;Notches are formed;
Fig. 5A, 5B Ausgestaltungen von integrierten Gasleitblechen, bei denenFig. 5A, 5B embodiments of integrated gas baffles in which
Aussparungen zum Ein- oder Ausströmen von Gas als kreisförmigeRecesses for inflow or outflow of gas as a circular
Gasdurchtrittsöffnungen ausgebildet sind;Gas passage openings are formed;
Fig. 6 in Draufsicht eine alternative Ausgestaltung einer Filtermaterialbahn, die durch gestanzte runde Löcher gebildet ist;Fig. 6 in plan view an alternative embodiment of a filter material web formed by punched round holes;
Fig. 7 in Draufsicht eine weitere alternative Ausgestaltung einerFig. 7 in plan view another alternative embodiment of a
Filtermaterialbahn, die durch dreieckförmige gestanzte Löcher gebildet ist;Filter material web formed by triangular punched holes;
Fig. 8 in Seitenansicht eine weitere alternative Ausgestaltung einerFig. 8 in side view another alternative embodiment of a
Filtermaterialbahn, die durch ein Blech mit einer geprägten Struktur gebildet ist;A filter material web formed by a sheet having an embossed structure;
Fig. 9 in Schnittansicht eine weitere Ausgestaltung einer Filtermaterialbahn, die durch ein Strukturblech mit dreidimensionalen Strukturelementen gebildet ist;9 is a sectional view of a further embodiment of a filter material web, which is formed by a structural sheet with three-dimensional structural elements;
Fig. 10 in Schnittansicht eine weitere Ausgestaltung einer Filtermaterialbahn, die durch ein Strukturblech mit ausgestanztem Hutzen gebildet ist;10 is a sectional view of another embodiment of a filter material web, which is formed by a structural sheet with punched Hutzen;
Fig. 1 1 in Schnittansicht ein erstes Ausführungsbeispiel eines Gasgenerators mit einer gewickelten Filtervorrichtung gemäß Fig. 1 B undFig. 1 1 in sectional view a first embodiment of a gas generator with a wound filter device according to FIG. 1 B and
Fig. 12 in Schnittansicht ein zweites Ausführungsbeispiel eines Gasgenerators mit einer gewickelten Filtervorrichtung gemäß der Fig. 1 B.12 is a sectional view of a second embodiment of a gas generator with a wound filter device according to FIG. 1 B.
Zum besseren Verständnis der vorliegenden Erfindung wird zunächst ein Filter gemäß dem Stand der Technik anhand der Figuren 2A, 2B erläutert. Die Figur 2A zeigt eine abgerollte, flach ausgebreitete Filtermaterialbahn 10' mit rechteckigen Abmessungen. Durch rollen der Filtermaterialbahn 10' entlang ihrer Längsrichtung entsteht ein hohlzylindrischer Wickelkörper V, der den Filter bildet und in der Figur 2B dargestellt ist. Der Luftdurchtritt durch den hohlzylindrischen Wickelkörper erfolgt in radialer Richtung, wie durch die Pfeile der Figur 2B angedeutet ist. Die Filtermaterialbahn besteht aus einem konventionellen Filtermaterial wie beispielsweise einem Streckmetallband. Dieses kann ein- oder mehrlagig ausgebildet sein. Durch Wickeln des Streckmetallbandes entsteht der Filter der Figur 2B.For a better understanding of the present invention, first a filter according to the prior art will be explained with reference to FIGS. 2A, 2B. FIG. 2A shows a rolled, flat-spread filter material web 10 'with rectangular dimensions. By rolling the filter material web 10 'along its longitudinal direction, a hollow cylindrical winding body V is formed, which forms the filter and is shown in FIG. 2B. The air passage through the hollow cylindrical winding body takes place in the radial direction, as indicated by the arrows of Figure 2B. The filter material web consists of a conventional filter material such as an expanded metal strip. This can be formed in one or more layers. By winding the expanded metal strip, the filter of FIG. 2B is formed.
Unter Streckmetall im Sinne der vorliegenden Erfindung wird dabei allgemein ein Werkstoff mit Öffnungen in der Oberfläche verstanden, die durch versetzte Schnitte ohne Materialverlust unter gleichzeitig streckender Umformung entstanden sind. Die Maschen eines solchen gitterartigen Materials sind dabei weder geflochten noch geschweißt. Neben dem Begriff Streckmetall findet auch der Begriff Streckgitter Verwendung.For the purposes of the present invention, expanded metal is generally understood to mean a material having openings in the surface, which have been produced by staggered cuts without loss of material while at the same time stretching. The meshes of such a lattice-like material are neither braided nor welded. In addition to the term expanded metal, the term expanded metal is also used.
Die Figur 1A zeigt einen abgerollten, längs ausgebreiteten Filter 1. Der Filter 1 weist eine Filtermaterialbahn 10 auf, die aus einem beliebigen wickelbaren Filtermaterial bestehen kann. Beispielsweise besteht die Filtermaterialbahn 10 aus einem oder mehreren aneinander gefügten Streckmetallblechen. Die Filtermaterialbahn 10 ist rechteckförmig ausgebildet und besitzt zwei schmale Seiten bzw. Enden 1 1 , 12. Der Filter 1 weist des Weiteren zwei geschlossene Blechabschnitte 30, 40 auf, die an die Enden 1 1 , 12 der Filtermaterialbahn 1 jeweils angefügt sind. Dies erfolgt beispielsweise durch Schweißen. Die Blechabschnitte 20, 30 weisen dabei die gleiche Breite wie die Filtermaterialbahn 10 auf, so dass die Filtermaterialbahn 10 und die Blechabschnitte 20, 30 gemeinsam eine längliche, rechteckförmige Filterbahn ausbilden. Die geschlossenen Blechabschnitte 20, 30 sind damit integrierte Bestandteile des Filters 1.FIG. 1A shows a rolled-out, longitudinally spread filter 1. The filter 1 has a filter material web 10, which may consist of any rollable filter material. For example, the filter material web 10 consists of one or more expanded metal sheets joined together. The filter material web 10 is formed rectangular and has two narrow sides or ends 1 1, 12. The filter 1 further comprises two closed sheet metal sections 30, 40, which are respectively attached to the ends 1 1, 12 of the filter material web 1. This is done for example by welding. The sheet metal sections 20, 30 have the same width as the filter material web 10, so that the filter material web 10 and the sheet metal sections 20, 30 together form an elongated, rectangular filter web. The closed sheet metal sections 20, 30 are thus integrated components of the filter 1.
In den Blechabschnitten 20, 30 des Filters 1 sind jeweils Aussparungen 40, 50 ausgebildet. Im Ausführungsbeispiel der Fig. 1A sind die Aussparungen als eine Mehrzahl kreisförmiger Löcher 40, 50 ausgebildet, die sich an der unteren Kante des einen Blechabschnitts 20 und an der oberen Kante des anderen Blechabschnitts 30 jeweils entlang einer geraden Linie erstrecken. Wie noch erläutert wird, dienen diese Aussparungen 40, 50 dem definierten Ein- oder Ausströmen von Gas in den Filter 1.In the sheet metal sections 20, 30 of the filter 1 each recesses 40, 50 are formed. In the embodiment of FIG. 1A, the recesses are formed as a plurality of circular holes 40, 50 extending along the bottom edge of one sheet portion 20 and the top edge of the other sheet portion 30 along a straight line, respectively. As will be explained, these recesses 40, 50 serve the defined inflow or outflow of gas into the filter 1.
Figur 1 B zeigt den gewickelten Filter 1 , der durch Aufwickeln der Filterbahn der Figur 1 A entsteht. Dabei ist zu beachten, dass auch die Blechabschnitte 20, 30 der Filterbahn gewickelt werden. Beim Wickelvorgang bildet sich ein hohlzylindrischer Wickelkörper, der den Filter 1 bildet. Aufgrund des Wickeins auch der Blechabschnitte 20, 30 wird die innere Mantelfläche des hohlzylindrischen Körpers durch den einen Blechabschnitt 30 und die äußere Mantelfläche des hohlzylindrischen Körpers durch den anderen Blechabschnitt 20 gebildet.Figure 1 B shows the wound filter 1, which is formed by winding the filter web of Figure 1 A. It should be noted that the sheet metal sections 20, 30 of the filter web be wrapped. During the winding process, a hollow cylindrical winding body forms, which forms the filter 1. Due to the winding also of the sheet metal sections 20, 30, the inner circumferential surface of the hollow cylindrical body is formed by the one sheet metal section 30 and the outer circumferential surface of the hollow cylindrical body by the other sheet metal section 20.
Die in den Blechabschnitten 20, 30 ausgebildeten Aussparungen 40, 50, die bezogen auf die Längsachse 7 des Hohlzylinders bzw. Filters 1 zueinander versetzt sind, erzeugen einen gerichteten Gasstrom durch den Filter 1. Der Versatz zwischen den Öffnungen 40, 50 führt dabei dazu, dass gemäß der Fig. 1 B im Inneren des Hohlzylinders erzeugtes Gas zunächst durch die Öffnungen 50 des einen Blechabschnitts 30 radial nach außen in den Filter eintritt, in diesem dann zusätzlich zu einer radial nach außen gerichteten Bewegung eine Bewegung in Längsrichtung der Filterachse 7 erfährt und dann durch die Öffnungen 40 in dem äußeren Blechabschnitt 20 in radialer Richtung den Filter verläßt. Durch die Blechabschnitte 20, 30 wird der Gasstrom somit gerichtet und im Vergleich zu einer rein radialen Durchströmung mit einem längerem Filterweg durch den Filter 1 geführt, so dass eine verbesserte Filternutzung vorliegt. Dies ist sowohl in thermischer Hinsicht als auch in partikelrückhaltetechnischer Hinsicht der Fall, da der längere Durchströmungsweg des zu reinigenden Gases durch den Filter 1 zum einen eine verbesserte Wärmeübertragung auf den Filter und zum anderen einen besseren Partikelrückhalt ermöglicht.The recesses 40, 50 formed in the sheet metal sections 20, 30, which are offset relative to each other with respect to the longitudinal axis 7 of the hollow cylinder or filter 1, generate a directed gas flow through the filter 1. The offset between the openings 40, 50 results in that shown in FIG. 1 B gas generated inside the hollow cylinder first enters through the openings 50 of a sheet metal portion 30 radially outwardly into the filter, then in addition to a radially outward movement undergoes movement in the longitudinal direction of the filter axis 7 and then leaves through the openings 40 in the outer plate portion 20 in the radial direction of the filter. By the sheet sections 20, 30, the gas flow is thus directed and compared to a purely radial flow with a longer filter path through the filter 1, so that there is an improved filter use. This is the case both in thermal terms and in terms of particulate retention, since the longer passage of the gas to be cleaned through the filter 1 makes possible, on the one hand, improved heat transfer to the filter and, on the other hand, better particle retention.
Die Blechabschnitte 20, 30 stellen damit Leitbleche bereit, die den Gasstrom gerichtet durch den Filter 1 hindurchführen und die dabei integraler Bestandteil des Filters 1 sind. Mit Herstellung des Filters aus der Filterbahn der Fig. 1A werden die Leitbleche 20, 30 automatisch bereitgestellt und ausgerichtet.The sheet metal sections 20, 30 thus provide baffles which direct the gas flow through the filter 1 and which are an integral part of the filter 1. With manufacture of the filter from the filter web of Fig. 1A, the baffles 20, 30 are automatically provided and aligned.
In einer Ausgestaltung entspricht die Länge eines Blechabschnitts 20, 30 im Wesentlichen der Umfangslänge des aus der Filterbahn gebildeten hohlzylindrischenIn one embodiment, the length of a sheet metal section 20, 30 substantially corresponds to the circumferential length of the hollow cylindrical formed from the filter web
Körpers. In diesem Fall überschneiden sich Bereiche eines Blechabschnitts 20, 30 nicht.Body. In this case, regions of a sheet metal section 20, 30 do not overlap.
Grundsätzlich kann jedoch auch vorgesehen sein, dass ein Blechabschnitt 20, 30 eineIn principle, however, it can also be provided that a sheet metal section 20, 30 a
Länge derart aufweist, dass er nach dem Wickelvorgang sich überlappende Bereiche ausbildet. Die in dem Blechabschnitt ausgebildeten Öffnungen sind für diesen Fall bevorzugt derart ausgerichtet, dass sie in den übereinander liegenden Abschnitten miteinander fluchten. Die Figuren 3A, 3B, 4A, 4B und 5A, 5B zeigen unterschiedliche Ausführungsbeispiele integrierter Gasleitbleche. Es sind dabei jeweils Aussparungen 41 , 51 , 42, 52, 43, 53 in Blechabschnitten 21 , 31 , 22, 32, 23, 33 vorgesehen, die zueinander versetzt sind, so dass ein gerichteter, nicht rein radial ausgerichteter Gasstrom durch den Filter erfolgt.Length has such that it forms overlapping areas after the winding process. The openings formed in the sheet metal section are in this case preferably aligned such that they are aligned with one another in the sections lying one above the other. Figures 3A, 3B, 4A, 4B and 5A, 5B show different embodiments of integrated gas baffles. There are in each case recesses 41, 51, 42, 52, 43, 53 in sheet metal sections 21, 31, 22, 32, 23, 33 are provided, which are offset from each other, so that a directed, not purely radially aligned gas flow through the filter ,
Bei der Ausgestaltung der Figuren 3A, 3B ist die Aussparung zum Ein- oder Ausströmen von Gas in den Filter als randseitige Materialauslassung 41 , 51 ausgebildet. Der jeweilige Blechabschnitt 21 , 31 weist hierzu angrenzend an die Filtermaterialbahn 10 eine geringere Breite im Vergleich zu der Breite der Filtermaterialbahn 10 auf.In the embodiment of FIGS. 3A, 3B, the recess for the inflow or outflow of gas into the filter is designed as edge-side material outlet 41, 51. The respective sheet metal section 21, 31 has for this purpose adjacent to the filter material web 10 has a smaller width compared to the width of the filter material web 10.
Bei der Ausgestaltung der Figuren 4A, 4B sind die Aussparungen 42, 52 zum Ein- oder Ausströmen von Gas ebenfalls randseitig am Blechabschnitt ausgebildet. Die Aussparungen 42, 52 sind dabei als zickzackförmiger Rand mit entsprechenden Einkerbungen vorgesehen. Randseitige Aussparungen 41 , 51 , 42, 52 gemäß den Figuren 3A, 3B, 4A, 4B weisen den Vorteil einer relativ einfachen Herstellung auf.In the embodiment of FIGS. 4A, 4B, the recesses 42, 52 for the inflow or outflow of gas are likewise formed on the edge side on the sheet-metal section. The recesses 42, 52 are provided as a zigzag edge with corresponding notches. Edge-side recesses 41, 51, 42, 52 according to FIGS. 3A, 3B, 4A, 4B have the advantage of a relatively simple production.
Bei der Ausgestaltung der Figuren 5A, 5B sind in den Blechabschnitten 23, 33 ähnlich wie bei der Ausgestaltung der Figuren 1A, 1 B kreisförmige Löcher 43, 53 ausgebildet, die jeweils entlang einer sich in Längsrichtung des Blechabschnitts erstreckende Linie verlaufen. Anders als bei der Ausgestaltung der Figuren 1A, 1 B ist dabei in dem einen Blechabschnitt 23 eine mittig angeordnete Reihe von Löchern 43 vorgesehen. In dem anderen Blechabschnitt 33 sind zwei randseitige Reihen von Löchern 53 vorgesehen. Hierdurch wird erreicht, dass der Gasstrom im Filter sich verzweigt und beispielsweise von den mittig angeordneten Löchern 43 sich sowohl nach oben als auch nach unten zu den Löchern 53 strömt.In the embodiment of FIGS. 5A, 5B, in the sheet-metal sections 23, 33, similar to the embodiment of FIGS. 1A, 1B, circular holes 43, 53 are formed, each extending along a line extending in the longitudinal direction of the sheet-metal section. In contrast to the embodiment of FIGS. 1A, 1B, a centrally arranged row of holes 43 is provided in one sheet metal section 23. In the other sheet section 33 two edge rows of holes 53 are provided. This ensures that the gas flow in the filter branches and flows, for example, from the centrally arranged holes 43 both upwards and downwards to the holes 53.
Bei den oben erläuterten Ausführungsbeispielen sind die jeweils dargestellten Blechabschnitte 20-23, 30-33 an eine Filtermaterialbahn 10 angefügt. Es handelt sich insofern um gegenüber der Filtermaterialbahn 10 gesondert hergestellte Bleche, die zur Herstellung der in der Figur 1A dargestellten Gesamtbahn in einem gesonderten Vorgang mit der Filtermaterialbahn 10 verbunden werden. Es liegt jedoch ebenso im Rahmen der Erfindung, dass die Filtermaterialbahn 10 und die diese begrenzenden Blechabschnitte 20, 30 einstückig ausgebildet sind. Die Figuren 6 bis 10 zeigen alternative Ausgestaltungen für die Halbzeuge zur Herstellung gewickelter erfindungsgemäßer Filter. Dabei wird vorab darauf hingewiesen, dass in den Figuren 6 bis 10 die seitlichen geschlossenen Blechabschnitte nicht gesondert dargestellt sind. Diese sind aber bei diesen Ausgestaltungen ebenso vorhanden, dabei jedoch einstückig mit der eigentlichen Filtermaterialbahn ausgebildet. Die Ausbildung kann entsprechend den Figuren 1A bis 5B erfolgen.In the exemplary embodiments explained above, the respectively illustrated sheet metal sections 20-23, 30-33 are attached to a filter material web 10. It is insofar as compared to the filter material web 10 separately produced sheets, which are connected to produce the overall web shown in the figure 1A in a separate operation with the filter material web 10. However, it is also within the scope of the invention that the filter material web 10 and the limiting sheet metal sections 20, 30 are integrally formed. FIGS. 6 to 10 show alternative embodiments of the semifinished products for producing wound filters according to the invention. It should be noted in advance that in Figures 6 to 10, the lateral closed sheet metal sections are not shown separately. However, these are also present in these embodiments, but formed integrally with the actual filter material web. The training can be carried out according to the figures 1A to 5B.
Dabei qualifiziert sich ein Abschnitt des abgerollten Filters als Filtermaterial oder als Gasleitblech in Abhängigkeit davon, ob Filterstrukturen in dem Halbzeug ausgebildet sind oder nicht. In den die Gasleitbleche bildenden Blechabschnitten sind keine Filterstrukturen vorgesehen. Vielmehr handelt es sich um geschlossene Blechabschnitte, die lediglich Aussparungen zum Ein- oder Ausströmen von Gas aufweisen.In this case, a section of the unrolled filter qualifies as a filter material or as a gas guide plate as a function of whether filter structures are formed in the semifinished product or not. In the gas guide plates forming sheet metal sections no filter structures are provided. Rather, it is closed sheet metal sections, which have only recesses for inflow or outflow of gas.
Gemäß der Ausgestaltung der Figur 6 ist als Halbzeug zur Herstellung eines gewickelten Filters ein Lochblech 13 mit gestanzten Löchern 131 vorgesehen, die beispielsweise, jedoch nicht notwendigerweise, rund ausgebildet sind. Die gestanzten Löcher sind dabei nur im Bereich der Filtermaterialbahn 13 ausgebildet, nicht in den (nicht dargestellten) geschlossenen Blechabschnitten. Bei der Ausgestaltung der Figur 7 ist die Filtermaterialbahn als Lochblech 14 mit Formstanzungen in Form von Dreiecken 141 ausgebildet. Andere Formstanzungen sind natürlich ebenfalls möglich.According to the embodiment of FIG. 6, a perforated plate 13 with punched holes 131 is provided as semifinished product for producing a wound filter, which are formed, for example, but not necessarily, round. The punched holes are formed only in the region of the filter material web 13, not in the (not shown) closed sheet metal sections. In the embodiment of Figure 7, the filter material web is formed as a perforated plate 14 with punched holes in the form of triangles 141. Other form punching are of course also possible.
Im Ausführungsbeispiel der Figur 8 weist die Filtermaterialbahn 15 eine geprägte Struktur mit einer Wanddickenänderung Δt in der Blechebenenrichtung auf. Durch die Wanddickenänderung entstehen bei dem gewickelten Blech Kanäle zur Gasführung im Filter.In the exemplary embodiment of FIG. 8, the filter material web 15 has an embossed structure with a wall thickness change Δt in the sheet-metal plane direction. Due to the change in wall thickness arise in the wound sheet metal channels for gas flow in the filter.
Bei der Ausgestaltung der Figur 9 ist die Filtermaterialbahn 16 als Strukturblech ausgebildet, das dreidimensionale Miniatur-Strukturelemente 161 aufweist. Diese können einseitig oder zweiseitig ausgebildet, gezogen, profiliert, gewalzt, hydrogeformt usw. sein. Durch die Strukturelemente 161 entstehen wieder Kanäle zur Luftleitung im Filter.In the embodiment of FIG. 9, the filter material web 16 is designed as a structural sheet having three-dimensional miniature structural elements 161. These can be formed on one or two sides, drawn, profiled, rolled, hydroformed, etc. The structural elements 161 again create channels for air conduction in the filter.
Die oben genannten Maßnahmen zur Filterbildung wie Stanzen, Prägen und Strukturieren eines Blechs können beliebig kombiniert werden. Beispielsweise ist in derThe above-mentioned measures for filter formation, such as stamping, embossing and structuring of a sheet, can be combined as desired. For example, in the
Figur 10 ein Ausführungsbeispiel dargestellt, bei dem eine Filtermaterialbahn 17 ausgestanzte Hutzen 171 bildet, wobei die Hutzen 171 sowohl dreidimensionale Miniatur-Strukturelemente ausbilden als auch Öffnungen 172 bereitstellen.FIG. 10 shows an exemplary embodiment in which a filter material web 17 punched out 171 forms, wherein the shrouds 171 both form three-dimensional miniature structural elements and openings 172 provide.
Bei den Blechen kann es sich beispielsweise um Stahlbleche, Aluminiumbleche oder Kupferbleche handeln.The sheets may be, for example, steel sheets, aluminum sheets or copper sheets.
Es wird darauf hingewiesen, dass der beschriebene Filter 1 mit integrierten Gasleitblechen 20, 30 grundsätzlich in beliebigem Kontext einsetzbar ist, beispielsweise in der Haushaltstechnik oder Raketentechnik. Eine bevorzugte Implementierung erfolgt in einem Gasgenerator einer Fahrzeuginsassen-Schutzvorrichtung. Beispiele für solche Implementierungen sind in den Figuren 1 1 und 12 dargestellt.It should be noted that the described filter 1 with integrated gas baffles 20, 30 can basically be used in any context, for example in household technology or rocket technology. A preferred implementation is in a gas generator of a vehicle occupant protection device. Examples of such implementations are shown in FIGS. 11 and 12.
Die Figur 11 zeigt in Schnittansicht einen rotationssymmetrisch aufgebauten Gasgenerator 100, der ein Generatorgehäuse 101 bestehend aus einem Generatortopf 102 und einen mit diesem verbundenen Generatordeckel 103 aufweist. Innerhalb des Generatorgehäuses 101 ist eine Brennkammer 1 10 ausgebildet, in der ein Anzündelement 120, eine Anzündladung und Treibstoffmittel (nicht dargestellt) angeordnet sind. Der Innenraum des Gasgenerators 100, der in der Figur 1 1 lediglich schematisch dargestellt ist, kann dabei in mehrere Kammern untergliedert sein, beispielsweise eine mittig angeordnete Anzündkammer, an die sich die eigentliche Brennkammer und daran anschließend eine Abscheidekammer anschließen. Auf den genauen Aufbau des Gasgenerators 100 kommt es dabei vorliegend nicht an.FIG. 11 shows a sectional view of a rotationally symmetrical gas generator 100 which has a generator housing 101 consisting of a generator pot 102 and a generator cap 103 connected thereto. Within the generator housing 101, a combustion chamber 1 10 is formed, in which a Anzündelement 120, a Anzündladung and fuel means (not shown) are arranged. The interior of the gas generator 100, which is shown only schematically in FIG. 11, can be subdivided into a plurality of chambers, for example a centrally arranged ignition chamber to which the actual combustion chamber and subsequently a deposition chamber adjoin. The exact structure of the gas generator 100 is not important here.
Innerhalb des Generatorgehäuses 101 ist ein gewickelter Filter 200 angeordnet, der beispielsweise entsprechend den Figuren 1 A, 1 B ausgebildet ist. Der Filter 200 weist ein wickelbares Filtermaterial 210, ein inneres integriertes Leitblech 220 und ein äußeres integriertes Leitblech 230 auf. In dem inneren integrierten Leitblech 220 sind untere Aussparungen 221 und in dem äußeren integrierten Leitblech 230 obere Aussparungen 231 realisiert.Within the generator housing 101, a wound filter 200 is arranged, which is formed, for example, according to the figures 1 A, 1 B. The filter 200 comprises a windable filter material 210, an inner integrated baffle 220, and an outer integrated baffle 230. In the inner integrated baffle 220 lower recesses 221 and in the outer integrated baffle 230 upper recesses 231 realized.
Nach Zünden des in der Brennkammer 1 10 angeordneten Treibstoffmittels entsteht Gas. Das erzeugte Gas strömt durch die unteren Aussparungen 221 des inneren Leitbleches 220 in das Filtermaterial 210 und in diesem, wie durch die Gasführungslinie A schematisch dargestellt, in Längsrichtung durch den Filter. An den oberen Aussparungen 231 des äußeren Leitbleches 230 verlässt der Gasstrom gereinigt und gekühlt den Filter 100. Das gereinigte und gekühlte Gas verlässt dann das Generatorgehäuse 101 über seitliche, im Generatortopf 102 ausgebildete Ausblasöffnungen 130.After ignition of the arranged in the combustion chamber 1 10 fuel gas is generated. The generated gas flows through the lower recesses 221 of the inner baffle 220 into the filter material 210 and, in this, as shown schematically by the gas guide line A, in the longitudinal direction through the filter. At the upper recesses 231 of the outer baffle 230, the gas stream exits and cools the filter 100. The cleaned and cooled gas then exits Generator housing 101 via lateral, formed in the generator 102 exhaust openings 130th
Das Ausführungsbeispiel der Figur 12 unterscheidet sich von dem Ausführungsbeispiel der Figur 1 1 dadurch, dass der Generatortopf 102 flacher ausgebildet ist und der Generatordeckel 103 sich zum Ausgleich stärker in Richtung des Generatortopfes 102 erstreckt. Die Gasführung A' ist derart, dass die Ausblasöffnungen 130 im Generatordeckel 103 im oberen Bereich des Generatorgehäuses ausgebildet sind.The exemplary embodiment of FIG. 12 differs from the exemplary embodiment of FIG. 11 in that the generator pot 102 is flatter and the generator cap 103 extends more strongly in the direction of the generator pot 102 for compensation. The gas guide A 'is such that the exhaust openings 130 are formed in the generator cover 103 in the upper region of the generator housing.
Die Erfindung beschränkt sich in ihrer Ausgestaltung nicht auf die vorstehend dargestellten Ausführungsbeispiele. Beispielsweise können die integrierten Leitbleche eine unterschiedliche Form als dargestellt aufweisen und/oder in anderer Weise mit Aussparungen zum Ein- oder Ausströmen von Gas in oder aus dem Filter versehen sein. Weiter ist die Erfindung nicht beschränkt auf bestimmte Filtermaterialien, solang diese wickelbar sind. Auch kann vorgesehen sein, dass der Filter keine gewickelte, sondern stattdessen gefaltete Filtermaterialbahnen aufweist. Es gilt dann wiederum, dass die Enden des gefalteten Filtermaterials als geschlossene Blechabschnitte zur Realisierung von Leitblechen ausgebildet sind.The invention is not limited in its embodiment to the embodiments shown above. For example, the integrated baffles may have a different shape than shown and / or otherwise be provided with recesses for entry or outflow of gas into or out of the filter. Further, the invention is not limited to certain filter materials as long as they are windable. It can also be provided that the filter has no wound, but instead folded filter material webs. It then applies again that the ends of the folded filter material are formed as closed sheet metal sections for the realization of baffles.
* * * * ** * * * *

Claims

Patentansprüche claims
1. Filtervorrichtung zum Filtern einer Gasströmung mit einer gewickelten oder gefalteten Filtermaterialbahn,A filter device for filtering a gas flow with a wound or folded filter material web,
dadurch gekennzeichnet,characterized,
dass mindestens ein Ende (1 1 , 12) der Filtermaterialbahn (10, 13-17) mit einem geschlossenen Blechabschnitt (20-23, 30-33) verbunden ist oder einen solchen ausbildet, wobei der geschlossene Blechabschnitt (20-23, 30-33) mindestens eine Aussparung (40-43, 50-53) zum Ein- oder Ausströmen von Gas in die oder aus derin that at least one end (11, 12) of the filter material web (10, 13-17) is connected to or forms a closed sheet metal section (20-23, 30-33), the closed sheet metal section (20-23, 30-33) 33) at least one recess (40-43, 50-53) for input or outflow of gas into or out of the
Filtervorrichtung (1 ) aufweist.Filter device (1).
2. Filtervorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die gewickelte Filtermaterialbahn (10, 13-17) einen hohlzylindrischen Wickelkörper der Filtervorrichtung bildet, wobei der geschlossene Blechabschnitt (20-23, 30-33) die innere oder äußere Mantelfläche des Wickelkörpers oder zumindest einen Teil derselben bildet.2. Filter device according to claim 1, characterized in that the wound filter material web (10, 13-17) forms a hollow cylindrical winding body of the filter device, wherein the closed sheet metal section (20-23, 30-33), the inner or outer circumferential surface of the winding body or at least forms part of it.
3. Filtervorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass beide Enden (1 1 , 12) der Filtermaterialbahn (10, 13-17) jeweils mit einem geschlossenen3. Filter device according to claim 1 or 2, characterized in that both ends (1 1, 12) of the filter material web (10, 13-17) each with a closed
Blechabschnitt (20-23, 30-33) verbunden sind.Sheet metal section (20-23, 30-33) are connected.
4. Filtervorrichtung nach Anspruch 3, soweit rückbezogen auf Anspruch 2, dadurch gekennzeichnet, dass der eine Blechabschnitt (30) die innere und der andere Blechabschnitt (20) die äußere Mantelfläche des hohlzylindrischen Wickelkörpers bildet.4. Filter device according to claim 3, as far as dependent on claim 2, characterized in that the one sheet metal section (30), the inner and the other sheet metal portion (20) forms the outer circumferential surface of the hollow cylindrical winding body.
5. Filtervorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die in den beiden Blechabschnitten (20-23, 30-33) jeweils ausgebildeten Aussparungen versetzt zueinander in den beiden Blechabschnitten (20-23, 30-33) ausgebildet sind.5. Filter device according to claim 3 or 4, characterized in that in the two sheet metal sections (20-23, 30-33) respectively formed recesses offset from one another in the two sheet metal sections (20-23, 30-33) are formed.
6. Filtervorrichtung nach Anspruch 5, soweit rückbezogen auf Anspruch 2, dadurch gekennzeichnet, dass der Versatz derart erfolgt, dass die Aussparungen (40-43, 50-53) in Längsrichtung des hohlzylindrischen Wickelkörpers zueinander versetzt sind. 6. Filter device according to claim 5, as far as dependent on claim 2, characterized in that the offset takes place such that the recesses (40-43, 50-53) are offset from each other in the longitudinal direction of the hollow cylindrical winding body.
7. Filtervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass als Aussparung (40, 43, 50, 53) im geschlossenen Blechabschnitt (20, 23, 30, 33) mindestens eine Gasdurchtrittsöffnung vorgesehen ist.7. Filter device according to one of the preceding claims, characterized in that as a recess (40, 43, 50, 53) in the closed sheet metal section (20, 23, 30, 33) at least one gas passage opening is provided.
8. Filtervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass als Aussparung (41 , 42, 51 , 52) im geschlossenen Blechabschnitt (21 , 22, 31 , 32) mindestens eine randseitige Materialauslassung oder Einkerbung vorgesehen ist.8. Filter device according to one of the preceding claims, characterized in that as a recess (41, 42, 51, 52) in the closed sheet metal section (21, 22, 31, 32) at least one edge-side material omission or indentation is provided.
9. Filtervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Filtermaterialbahn (10, 13-17) ein metallisches Filtermaterial aufweist.9. Filter device according to one of the preceding claims, characterized in that the filter material web (10, 13-17) comprises a metallic filter material.
10. Filtervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der oder die Blechabschnitte (20-23, 30-33) einstückig mit der Filtermaterialbahn (13-17) ausgebildet sind.10. Filter device according to one of the preceding claims, characterized in that the one or more sheet metal sections (20-23, 30-33) are formed integrally with the filter material web (13-17).
1 1. Filtervorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Filtervorrichtung einen Blechstreifen aufweist, wobei der Blechstreifen im Bereich der Filtermaterialbahn (13-17) gestanzt und/oder geprägt ist und/oder dreidimensionale Strukturelemente ausbildet, so dass die Filtermaterialbahn (13-17) im gewickelten Zustand als Filter wirkt, während der Blechstreifen im Bereich der Blechabschnitte bis auf die mindestens eine Aussparung (40-43, 50-53) zum Ein- oder Ausströmen von Gas geschlossen ausgebildet ist.1 1. Filter device according to claim 10, characterized in that the filter device has a metal strip, wherein the metal strip in the region of the filter material web (13-17) is punched and / or embossed and / or three-dimensional structural elements formed, so that the filter material web (13-17) 17) in the wound state acts as a filter, while the metal strip in the region of the sheet metal sections is formed closed except for the at least one recess (40-43, 50-53) for the input or outflow of gas.
12. Filtervorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der oder die Blechabschnitte (20-23, 30-33) gesondert hergestellt Teile darstellen, die der Filtermaterialbahn (10) verbunden sind.12. Filter device according to one of claims 1 to 9, characterized in that the or the sheet metal sections (20-23, 30-33) separately produced parts represent, which are connected to the filter material web (10).
13. Filtervorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass die Filtermaterialbahn (10) mindestens ein Streckmetallblech aufweist.13. Filter device according to claim 12, characterized in that the filter material web (10) has at least one expanded metal sheet.
14. Filtervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Filtermaterialbahn (10, 13-17) mehrere aufeinanderliegende Materiallagen aufweist, die gemeinsam gewickelt sind. 14. Filter device according to one of the preceding claims, characterized in that the filter material web (10, 13-17) has a plurality of superimposed layers of material, which are wound together.
15. Gasgenerator einer Fahrzeuginsassen-Schutzvorrichtung, gekennzeichnet durch einen Filter gemäß Anspruch 1. 15. Gas generator of a vehicle occupant protection device, characterized by a filter according to claim 1.
EP10716305A 2009-03-31 2010-03-29 Filter device and gas generator having a filter device Withdrawn EP2414066A1 (en)

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DE102009015217A DE102009015217B3 (en) 2009-03-31 2009-03-31 Filter device and gas generator with a filter device
PCT/EP2010/054075 WO2010112450A1 (en) 2009-03-31 2010-03-29 Filter device and gas generator having a filter device

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EP (1) EP2414066A1 (en)
JP (1) JP2012517941A (en)
CN (1) CN102271783A (en)
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RU2011126628A (en) 2013-05-10
DE102009015217B3 (en) 2010-10-14

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