CN101522282A - Wound wire filter elements - Google Patents

Abstract

A cylindrical wound wire filter with an inner bore, suitable for use with an airbag inflator, has at least two different outer diameters and/or at least two different inner diameters. Wires in adjacent layers can be bonded together by adhesive or brazing, or have a sheet-like material therebetween, such as a ceramic filter paper.

Description

Wound wire filter elements

Background technology

The manufacture method that the present invention relates to filter element and undertaken by Wound wire around mandrel.

Making filter by screw winding such as paper or material strips wiry exists for a long time.US2122582 has described the air intake filter that is used for internal combustion engine by screw winding gimp wire (gimped wire) preparation.As describing among the US4048074, the spiral wound polymer fiber has been used to make various filtrations or separator.

In the gas generator field, for example be used for being used for the airbag aeration of passenger vehicle, use filter to control and cool off this thermal explosion product of this gas generator generation.US5230726 has described the hollow barrel-type core body that has a plurality of material layers (comprising filter layer) of screw winding around it; The core body that to reel cuts into the filter of required size then.Described in US5702494 and US5908481, ceramic fibre is wound in a spiral in core body on every side with preparation airbag aeration tube filter.As for wire filter, WO05/065811 has described filter, and it has the copper coated iron wire of tight woollen yarn knitting, and the temperature between copper fusing point and its sintering temperature is heat-treated then, makes wire bonded to each other in the position of its intersection.WO05/065999 has described has two-layer screw winding wire filter, is symmetrical in the helical angle that is superimposed upon the ground floor on himself in the radial direction wherein, and the second layer has thinner filter effect by using thinner wire.

From the machine that is used for metal wire is reeled around the prestressed pipe with several rice diameters, to the machine that is used for line is reeled around bobbin with several cm diameters or pipe, these coiling machines are known.Be provided for these and computer control also is known.

Existence is to simpler and be used for Wound wire is fixed to the demand of the method for itself, and has the demand to the filter with the profile that is different from tubular or geometry.

Summary of the invention

According to more than, the invention provides the Wound wire filter that is different from positive rectangular cylinder (right rectangular cylinder), this Wound wire filter has improved intensity, and this Wound wire filter has as another material that is arranged on the radially mid portion between the contiguous metal silk layer.

The invention provides the tubular Wound wire filter that has endoporus,, it is fit to use with airbag inflator, has at least two different external diameters and/or at least two different internal diameters.Wire in the adjacent layer can be combined by brazing, and perhaps between has flaky material, for example ceramic filter.Brazing material for example is an assistant, and it can be adhesive or braiding or non-woven material bar, for example ceramic filter of supplying with wire.

Generally speaking, the invention provides a kind of Wound wire filter, it has first internal diameter and first external diameter, with at least one second (different) internal diameter (being different from first internal diameter) or one second (difference) external diameter (being different from first external diameter).

Description of drawings

Fig. 1 has described this coiler device.

Fig. 2 has described the Wound wire filter of dumbbell shaped.

Fig. 3 has described the cross section of the filter with a plurality of internal diameters and sacrifice mems.

Fig. 4 has described the device that has one group of grovved roll and be used for applying Fig. 1 of the applicator that maybe can spray the assistant material.

Fig. 5-7 described have smooth exterior, screw winding is inner and more than the Wound wire filter of an internal diameter.

Fig. 8 has described the Wound wire filter with expanded metal core.

Fig. 9 A, 9B and 9C have described side view, plane and the perspective view according to the filter design of the present invention's preparation respectively.

The specific embodiment

Described as the background technology part, the computer control coiler device is known.In one embodiment, the present invention utilizes computer control that filter is had to be different from the shape of positive rectangular cylinder (rightrectangular cylinder) in new ways.As shown in Figure 1, typical coiler have mandrel 1 and indefinite length material material source 2, be wire 3 in the present invention, be wound on the mandrel.In order to reach purpose of the present invention, the wire that this wire is preferably flat is though circle, ellipse or other shape of cross section also are operable.This mandrel is preferably collapsible mandrel, the similar chuck that is used for drill bit.In these computer-controlled machines, control the position L of this material source with respect to the rotary speed R of mandrel.Angle [alpha] (helical angle) between wire and the mandrel center line between (rotation) remains unchanged usually and material source moves with a direction regularly, perhaps back and forth movement (perhaps on the required any length of these parts of preparation) before and after doing between the end of mandrel regularly.Be generally zero in the time of staying of end; Like this, in case this material source arrives an end of mandrel promptly returns to the other end.

In the present invention, angle [alpha] changes, and the mobile of material source change, to realize required geometry.By simple programming,, come the adjustable screw angle and the time of staying to be different from the geometry of simple positive rectangular cylinder with preparation perhaps to the adjusting of active computer control.As to the substituting of helical angle, can specified volume around than; " ratio of reeling " is meant the coiling number on the parallel unit straight length of getting with the rotation of this mandrel.Therefore because along with change has taken place winding girth wiry, constant helical angle can cause reeling than changing along with the growth of this device, and similarly, constant coiling is than causing helical angle to change along with the growth of this device.The time of staying in specific axial length process can change the thickness that changes winding layer on this length.This device improves by ready-made parts or by existing coil winding machine ground relatively simply and makes.

Fig. 2 has described the Wound wire filter 10 with dumbbell shape, has central cylinder 12 and disc end 13, and the latter has the radius bigger than central cylinder separately.In order to make such device, computer programming to twine, is twined one of them dumbbell end then on the central cylinder on the whole length of filter, move to the other end again and twine this end.If translational speed is slow excessively, the wire that the first dumbbell end is placed outward will be wound into core earlier, and can not make a distinction with the wire at core substantially from the teeth outwards.Therefore filter shown in Figure 2 has the profile that is different from the simple right rectangular cylindrical shell.This device but have two external diameters, one is meant core, one is meant the dumbbell end, also has single internal diameter.

These filters can be used to airbag inflator, as wire gauze filter, for example described in the US6277166, by with reference to its content is introduced herein.In the patent of ' 166, wire gauze filter is pressed into and forms annular filter in the mould, and it has the rib of axial arranging on the filter outer surface.Utilize the present invention, can prepare filter, on function, be similar to the dumbbell type design among Fig. 2, between the disk of outermost, can have other more big disk (two different external diameters of promptly many groups) with a plurality of ribs of laterally arranging.

In some airbag inflator, on the shorter length of solid tubes, provide the blasting charge, the sealing of the end of pipe, split ring around the outer surface that is distributed in pipe so that gas overflow.Utilize the present invention, can be provided with on mandrel and sacrifice band, filter is wound into required geometry simultaneously.To install then and remove, and remove taking from mandrel.This band can be an organic polymer, as neoprene, removes with machine or manual mode, or polystyrene, burnt or dissolved with chemical mode, or water-soluble polymer.As shown in Figure 3, the filter 31 that obtains has hole 32, and expendable material band 33 acts on coiling material and forms chamber 35.Filter shown in Figure 3 has single external diameter and a plurality of internal diameter.Be surprisingly found out that, in addition at wire under the situation of reeling under the tension force, when the expendable material band is removed rear chamber the deformation that any people of allowing worries can not take place yet.In use, this chamber is as the manifold that is used for explosion gas.Fig. 3 has also described continuous (axially) skin 37, and it is formed by continuous winding arranged side by side; That is, the positive cartridge filter that almost will reel of this skin is arranged in the pipe.Use this pantostrat, this explosion gas axially leaves this filter.

Fig. 4 has described and can put on improved procedure wiry before reeling.In one embodiment, this wire passes one group of serrated roller 42, makes Wound wire produce gauffer like this.If filter is set in the tubular structure, the wire that preferably this is had fold is placed on the outside; Crisp wire has better compressibility (radially) than the wire that does not have gauffer of monolithic filter, therefore has the easier inner barrel that is press-fit to of fold filter wiry on the outer surface.Same, plicated layer can directly adjacent formation with this mandrel so that tubular structure (airbag charge As mentioned above) can be pushed in the hole of filter.

Another embodiment shown in Figure 4 is before wire twines assistant to be coated to its surface.For example, use the applicator 44 adjacent to apply maybe can to spray fluid and from liquid reservoir 46, be coated on this wire with wire.This applicator can be brush or nozzle.This assistant needn't be used in combination with gauffer, and can be coated to one or both sides wiry.This assistant can be an adhesive, thinks that this winding-structure increases shear strength.This assistant can be the paste that is used for brazing.Can be with the filter sintering of so reeling to provide diffusion bonding in the wire cross part.Stronger bonding by using the brazing assistant to realize, the copper powder in medium (for example propane diols) (for example 300 orders) for example.Wire is by brazed process, and the wire place of intersection forms stronger bonding.Keeping filter bits in sintering or other heat treatment process can be to suit on mandrel, can apply non-active material (for example SiN, BN) in this case on mandrel, it will make this can more easily remove from mandrel after heat treatment through heat treated filter.

Assistant is similar with applying on wire, can be in winding process with strip of sheet-like material with this wire feeding.Suitable flaky material comprises braided metal or glass fibre, non-woven mat (for example glass or carbon fiber, or ceramic filter (described in US4890860 and US6913059, by with reference to its disclosure is introduced herein), stainless steel microfibre (for example screen cloth form); The width of filter paper preferably is wider than width wiry.Utilize non-woven textile or filter paper can filter thinner particle relatively.According to being used for metal wiry (for the present invention, preferably have at least and SS 309 same good stable on heating stainless steels), but the polymer fiber or the band of pyrolysis can be imported with wire, this band pyrolysis is pottery or carbon in the heat treatment process of filter.

Fig. 5-7 has described the Wound wire filter, and it has smooth outer surface, inner surface and less internal diameter, and wire is reeled side by side in outer surface, and in inner surface the wire screw winding.Fig. 5 is the close up view of Wound wire filter, wherein has interior diameter 501, and wherein this wire twines side by side and forms smooth or flat surface, and mid portion, and wherein wire twines and becomes spiral 503.Innermost surface stops at support (shelf) 505 places, forms flange effectively on inside, with the less internal diameter (ID) of device with separate than large diameter.Fig. 6 has described similar device, and the outer surface 601 of its middle filtrator is smooth (reeling side by side), and stops at small rack 603 places, and reeling at this place becomes spiral 605, as seeing on the inner surface than major diameter.As shown in Figure 5, the internal diameter than minor diameter stops at another support 607 places.Fig. 7 is another perspective view with similar device of the smooth outer surface 701 that covers on the screw winding inside 703, and this device has larger-diameter internal diameter (ID) at 703 places, and 705 places have internal diameter than minor diameter at the edge.From the device shown in Fig. 5-7 as can be seen, the coiling filter can be manufactured with a plurality of internal diameters and/or external diameter, and innermost layer and/or outermost surface can with smooth coiling (promptly reeling side by side) or more the screw winding mode of porosity and looseness prepare.

In another embodiment, expanded metal sleeve can be set on internal diameter and/or the external diameter.The axial strength of filter can be increased by the diamond opening of arranging on this expanded metal sleeve along filter axial.In addition, if the thickness of sleeve greater than the thickness wiry that is used to reel, then this sleeve can be used as radiator, protects less wire.This expanded metal sleeve can be used the manufacturings of carbon steel, stainless steel or other metal material.If this device of sintering, this sleeve can be just in position so, and this sleeve will fuse together with any wire that contacts with it thus.

In another embodiment, can metal wire be wound on the mandrel, insert is placed on the existing winding, reel then and continue effectively this insert is embedded between the relative inside and outside winding at the end time-out of not finishing winding.This operation can be carried out repeatedly, and can comprise the inside porous sleeve of the described expanded metal sleeve of similar preamble.This insert can be form (metal or polymer comprise weaves like screens or fabric), preformation type tube (similar net form metal cylinder), the screen cloth (plastics or metal, preferred braiding) of porous chips, or its any combination.

In aforementioned embodiments, filter preferably has the length of internal diameter and about one to two inch (20-50cm) of about one to three inch (2.5-7.5cm), is suitable for being installed in the steering wheel of vehicle the part as the air bag of driver side.Be used for the filter much longer usually (approximately 12-18cm) of the airbag safety device of passenger side, and have littler diameter (about 15-40cm).The encapsulated window curtain device that protection does not contact with side window has even littler internal diameter (5-20mm) and length (about 20-30mm).The thickness of filter depends on specific purposes and used cartridge bag.Preceding (driver and passenger) air bag generally uses explosive material to be used for this cartridge bag, and side (curtain) air bag uses the blasting charge of lighting or breaks in knockout process with the gas tank of release gas in knockout process.

The preceding air bag that is used for Vehicular occupant one side is generally much bigger than driver's preceding air bag, therefore needs to produce more gas.Preceding airbag apparatus the driver may comprise under the situation of single cartridge bag, passenger's preceding air bag may have nearly five cartridge bags that are equal to, the cartridge bag that comprises different size (is not that all can be lighted, because in the airbag technology of " clever intelligence ", this position of perception passenger's body weight decides the explosive force that needs).Because vehicle inside design, passenger's preceding air bag must cover the much bigger part of instrument board than driver's preceding air bag (its driver that adequately protects is away from steering wheel).Therefore, this device and therefore this filter is much longer such as the above.

In another embodiment, the invention provides the filter that is particularly useful for the preceding air bag of passenger, wherein wire is wound on around the hollow core with a plurality of openings.This core body can be any material that can bear blast and filtration is provided.The wire mesh screen that can use weaving or braiding is as this core body.Woven metal wire sheet or screen cloth are wound into pipe or cylindrical shell, and the end of soldered adjacency.Usually wire netting is woven into cylindrical shell, in the position that knit wire overlaps, can be with its spot welding to give screen cloth with globality; This screen cloth cut into required pipe range thereafter.Another kind of alternative is an expanded metal sheet; Similar with pieces of fabric, this expanded metal sheet is cut the size of application and soldered joining edge so that cylindrical shell to be provided.Because blast is isotropic basically, and wire is wound on around the core body, so joining edge is preferably imbricate.As shown in Figure 8, expanded metal sheet is wound into cylindrical shell and joining edge is welded so that core body 801 to be provided.Preferably () outwards opened in each end 803 of this core body.Then this core body is placed on the mandrel, wire 805 is wound on the core body so that filter to be provided.Filter is the same as previously described, preferably end points wiry is soldered on the winding, stops suddenly then to guarantee wire can not scatter (loose).As previously mentioned, this Wound wire can be formed in various patterns or structure are provided in the winding.Core body has the thickness of about 0.1mm to about 1.0mm (thickness is approximately 0.5mm in the drawings) preferably by the stainless steel manufacturing, and has about 5% to about 50% interstitial space (being the mark of number of openings as the area of a side).

Fig. 9 A-9C is side, plane and the perspective view of filter, and wherein inner surface 901 is smooth relatively, and outer surface 903 is to make with big relatively angle, makes the spiral winding that loose relatively pattern is provided.Compare with the support shown in Fig. 6, because the winding method shown in these figure, support 905 obtains limiting more clearly, has so just formed the flange with good tolerance limit, to closely cooperate with the shell that this filter is used for wherein.

The description of preamble only is intended to illustrate and is not used in restriction.According to studying carefully of the present invention, various changes, improvement and increase can become apparent for those skilled in the art, and these mean still within the scope and spirit of the present invention that are defined by the claims.

Claims (18)

1, a kind of Wound wire filter, by continuous single wire manufacturing and have first internal diameter and first external diameter, and at least one is not equal to second internal diameter and second external diameter of corresponding first diameter.

2, filter as claimed in claim 1 is characterized in that, comprises two second external diameters.

3, Wound wire filter, wherein the wire of adjacent layer interosculates.

4, filter as claimed in claim 3 is characterized in that, this wire is by the brazing combination.

5, filter as claimed in claim 3 is characterized in that, this wire is by the adhesive combination.

6, a kind of Wound wire filter, wherein at least a portion of winding comprises strip of sheet-like material, with this wire in abutting connection with and at least a portion of spreading all over Wound wire.

7, filter as claimed in claim 6 is characterized in that, this flaky material is a braided metal.

8, filter as claimed in claim 6 is characterized in that, this flaky material is a ceramic filter.

9, filter as claimed in claim 1 is characterized in that, comprises first and second internal diameters, and further comprises continuous skin.

10, a kind of method for preparing filter, comprise: Wound wire has interior and ring device most outer diameter to make to mandrel, and changes pitch angle alpha will wiry to be spooled, the nothing motion time of staying and position to make the filter with at least two internal diameters or at least two external diameters effectively.

11, method as claimed in claim 10 is characterized in that, further comprises changing helical angle to produce smooth surface in the inside of this filter or the outside of this filter effectively.

12, method as claimed in claim 10 is characterized in that, further being included in reels applies this wire with brazing material before.

13, method as claimed in claim 10 is characterized in that, further comprises and flaky material this wire that is adjacent to reel.

14, a kind of Wound wire filter comprises: the hollow barrel-type core body with a plurality of openings; With the continuous single wire that is wound on along this core body length around this core body.

15, filter as claimed in claim 14 is characterized in that, this core body is the expanded metal sheet that is wound into tubular and welds at joining edge.

16, filter as claimed in claim 14 is characterized in that, radially outwards open the end of this core body.

17, filter as claimed in claim 14 is characterized in that, this hollow barrel-type core body is arranged between inner winding and the outside winding.

18, filter as claimed in claim 14 is characterized in that, this hollow barrel-type core body is screen cloth or the fabric of being made by metal or plastics.

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