CN101282776A - Air filter cartridge and air cleaner - Google Patents

Abstract

The disclosure concerns air cleaners (70) and replacement parts for air cleaners. A preferred replacement part air filter cartridge (1) is depicted which includes first and second ends, with filter media extending therebetween; and, a laterally outwardly flexible axial seal ring (22) on the first end, circumscribing an air flow exit aperture. Examples of preferred filter cartridges with preferred laterally flexible axial seal rings (22) thereon, are shown and described. Also described is an air cleaner (70) including the filter cartridge (1). Further, an air cleaner including an air aperture (105) in communication with a region between an axial seal ring (22) and a radially extending dust shield (45) is provided. Methods of assembly and use are described.

Description

Filtering element for air filter and air filter

Cross reference to related application

[0001] the application be on July 11st, 2006 as the pct international patent application with the name application of u s company-Donaldson Company, Inc, the said firm is designated as the applicant of All Countries except that the U.S., and WilliamMichael Juliar, David Escher, with Kevin Schrage, be United States citizen, the applicant who only is designated as in the U.S..

[0002] the application comprises that the applying date is the content of the U.S. Provisional Application 60/726,907 on October 14th, 2005.US60/726,907 complete content is incorporated into this paper reference at this, and requires the priority of U. S. application 60/726,907 with suitable degree.

[0003] the application comprises that also the applying date is some theme of the U.S. Provisional Application 60/699,136 on July 13rd, 2005.The complete content of provisional application 60/699,136 is incorporated into this paper reference at this.In addition, require the priority of U.S. Provisional Application 60/699,136 with suitable degree.

Technical field

[0004] the present invention relates to air filter and parts thereof.The invention particularly relates to and have shell and can take out the also air filter of replaceable (can keep in repair) filter element.This paper concrete structure shown and that disclose relates to maintainable filter element, and it has improved axial seal structure.

Background technology

[0005] air filtration is used on the multiple structure.Common application is as air filter, is used for air inlet to internal combustion engine.After using a period of time, the filter medium in the cleaner needs repairing, perhaps by cleaning or all changing.Usually, for the air filter on the internal combustion engine that is used in vehicle for example, filter medium is contained in and can takes out or the parts of replaceable (can keep in repair), in element or the filter core.Example is disclosed in the U.S. Provisional Application 60/421,882 that the applying date is on October 28th, 2002; The applying date is the U.S. Provisional Application 60/453,737 on March 6th, 2003; The applying date is the U. S. application 10/691,856 on October 28th, 2002, and is existing open with US 2004/0134171 on July 15th, 2004; The applying date is the PCT application US 03/33952 on October 28th, 2002, and is existing open with PCT WO04/039476 on May 13rd, 2004; And the applying date is the U.S. Provisional Application 60/699,136 on July 13rd, 2005.

[0006] the selected structure of every part of list of references disclosed in the above-mentioned paragraph relates to formation axial seal as body seal, in use between filter element and shell.In this application, disclosed forming the improvement of described axial seal.

Summary of the invention

[0007] the present invention relates to the improvement of air filter.Described technology is especially developed and is used for air filter, is used for the engine charge of cleaning internal combustion engines, and described internal combustion engine for example is used for vehicle, as bus, and truck or mobile device, as tractor or Architectural Equipment, or the stationary power generation machine.Improvement relates generally to air filter, and wherein filter medium is the part that can take out with the parts of replaceable (can keep in repair).

[0008] improvement that the present invention relates to was on July 15th, 2004 in open day with using basis, and US publication is 2004/0134171; Open day is on May 13rd, 2004, and the PCT publication number is WO 04/039476; With, the applying date is on July 13rd, 2005, and the air filter of U.S. Provisional Application 60/699,136 is relevant, and above document is incorporated into this paper reference at this.Described technology partly relates to the improvement of the axial seal of filter element, to obtain certain desirable effect.In addition, provide the optional improvement of shell, be disclosed in the U.S. Provisional Application 60/699,136 that is incorporated into this paper reference at this.

[0009] in this article, disclose and show some specific, favourable feature.Do not need structure to comprise all above-mentioned features as herein described, obtain some advantage.

I. description of drawings

[0010] Fig. 1 is the side view according to filter element of the present invention;

[0011] Fig. 2 is the end-view of filter core shown in Figure 1;

[0012] Fig. 3 is the amplification view of filter core shown in Figure 1 along the line 3-3 of Fig. 2;

[0013] Fig. 4 is the local figure of amplification of Fig. 3 part;

[0014] Fig. 4 A is a view shown in Figure 4, has the dimension line that illustrates, radius, and angle.

[0015] Fig. 5 is the cutaway view that amplifies, and the filter element that Fig. 1 is shown is installed in the air cleaner assembly together with inner supporting structure;

[0016] Fig. 6 is the amplification partial schematic diagram of the part of Fig. 5;

[0017] Fig. 7 is the side view of the another kind of filter element of filter element shown in Figure 1;

[0018] Fig. 8 is the end-view of the blind end of filter element shown in Figure 7;

[0019] Fig. 9 is the amplification view along the line 9-9 of Fig. 8;

[0020] Figure 10 is the local figure of amplification of the part of Fig. 9;

[0021] Figure 10 A is the view of Figure 10, has the dimension line that illustrates, radius and angle.

[0022] Figure 11 is the face upwarding view that can be used for other air cleaner casings of filter element shown in Fig. 1-4 and Fig. 7-10;

[0023] Figure 12 is the cutaway view of air filter shown in Figure 11, has from filter core shown in Fig. 1-4 and Fig. 7-10 to carry out improved filter element arrangement wherein; With,

[0024] Figure 13 is the local figure of amplification of the part of Figure 12.

The specific embodiment

I. example filter filter core, Fig. 1-6.

[0025] as previously mentioned, it is the US publication US 2004/0134171 on July 15th, 2004 that the present invention partly relates to open day, with the improvement of the filter element that discloses the general type disclosed in the PCT publication number WO 04/039476 that day is on May 13rd, 2004, it is for referencial use that above-mentioned two pieces of documents are incorporated into this paper at this.The example of described improved filter element has been shown among Fig. 1-6.

[0026] at first referring to Fig. 1, Reference numeral 1 is represented described filter element generally.Generally, filter core 1 comprises first and second opposite ends 3 and 4, has filter medium 7 and extends therebetween.Medium 7 can comprise the media type of any kind, and common example is a folded medium.Specific medium is selected and is provided with is the problem of design alternative, depends on the particular requirement of related air filter.

[0027] endways 4, filter core 1 comprises end cap 10.Shown concrete end cap 10 comprises closed end cap 11.In this article, term " closed " expression, end cap 10 does not comprise that the hole passes through wherein, walks around medium 7 when described hole allows air-flow to enter the inside of filter core in the outside from filter core 1, as hereinafter discussing in conjunction with Fig. 3.

[0028] in opposing ends 3, filter core 1 comprises end cap 15.End cap 15 is end caps 16 of opening, represents that it comprises medium pore 17 by therebetween, and as shown in Figure 3, described hole allows air to pass through, and without medium 7, between the zone of inner space 20 that forms by medium 7 and filter element 1 outside, to flow.In common use, hole 17 can be an outlet opening, and the location communicates with the admission line air-flow of engine or similar structures.

[0029] therefore, in common work, filtered air to enter zone 20 by medium 7 from the outside of filter core 1.Medium 7 is around inner space 20, and therefore, air just can not arrive inner space 20 by medium 7.Filtered air discharges by the hole on the end cap 16 17 from filter element 1 then.Described air is conducted through the air inlet of suitable pipeline to engine or similar device subsequently.

[0030] general, have body seal structure 22 on the end cap 16 of opening.Body seal structure 22 generally is configured to the bonding part air cleaner casing, when filter element 1 is mounted use, makes filter core 1 sealing against shell, walks around medium 7 to prevent air.Shown concrete body seal structure 22 be included in hereinafter will more detailed introduction axial seal 23.Employed in this article term " axially " and version thereof are meant the sealing force along central shaft 24 directions consistent with the direction of filter core 1 shown in Figure 3.Therefore, axial seal 23 is such sealings, and it is set on the cardinal principle bearing of trend of axis 24, forms sealing under the effect of compression or bias force.

[0031] more broadly, term " axially " is meant generally along the bearing of trend of central axis 24 directions when being applied to this paper.On the contrary, in Fig. 3, term used herein " radially " and version thereof are meant the bearing of trend of cardinal principle perpendicular to central axis 24,, radially around axis 24, see Fig. 3 that is.

[0032] filter element 1 comprises a plurality of other features, be disclosed in substantially and openly day be the US publication US 2004/0134171 on July 15th, 2004 and be among the PCT publication number WO04/039476 on May 13rd, 2004 in open day that these two parts of documents all are incorporated into this paper reference at this.

[0033] referring to Fig. 1, filter element 1 comprises outside or outer support frame or structure 30, and it is around medium 7, and in the example shown, extends between relative end cap 15 and 10.Shown concrete outer support frame 30 comprises: the first, in the present example, the shield region 31 of atresia; With, the second, in the present example, perforation cushion region 32.The shield region 31 of atresia is extended between the supporting zone 32 of end cap 16 and perforation substantially.The supporting zone 32 of perforation extends between the shield region 31 of atresia and closed end cap 10 substantially.Common external support structure 30 comprises the structure of single one, and is for example molded by plastics.

[0034] common, the distance that the shield region 31 of atresia is extended be not more than filter element 1 between end cap 15 and 10 axial length 40%, and be generally at least 10% of this length.

[0035] Chuan Kong shield region 32, at least 50% opening usually, and frequent at least 70% opening.Term " % opening " expression, by the circumference amount of area that the supporting zone of perforation forms, described at least percentage is the opening that air communication is therebetween crossed.Common perforation supporting zone 32 comprises axial rib 37, is interconnected by beam structure 38.Shown beam structure 38 is helical structures 39, has at least two strands usually.The shield region 32 of perforation extend usually filter core 1 between the end caps 15 and 10 length at least 50%.

What [0036] be provided with around the supporting zone 32 of perforation is the radially outstanding rings 41 of central authorities.Central rings 41 can be used as the integral part of perforation supporting zone 32 and forms, and is the integral part of external support structure 30 therefore.Ring 41 location conducts are ledge easily, so that enter during manufacture.

[0037] still referring to Fig. 1 and 3, and especially at first here referring to the shield region 31 of atresia.The shield region 31 of atresia comprises radially outward from its outstanding dust ring 45.Dust ring 45 is radially outward outstanding from the adjacent part of supporting construction 30 substantially, promptly from the radially outward outstanding distance of 4mm at least of atresia shield region 31, and is generally 5mm-15mm.The effect of dust ring 45 will further be discussed in conjunction with the explanation of Fig. 5 below.

[0038] contiguous dust ring 45 places are set, filter core 1 comprises first parts 48 of the rotation connected structure 47 of discontinuous screw.

[0039] in this article, the following fact represented in term " discontinuous screw ", and when engaging mechanism was worked by the form of helicitic texture, it was not continuous screw thread on the rotation extension.Term " rotation connected structure " is meant the following fact, in case after filter core 1 partly rotated in shell, engaging mechanism work was moved between following two positions: (1) locking and the position of installing when mounted; (2) non-locking and movably position.

[0040] the rotation connected structure 47 of discontinuous screw, day is the US publication 2004/0134171 on July 15th, 2004 substantially as openly, disclosed with the PCT publication number WO 04/039476 that open day is on May 13rd, 2004, above-mentioned each part document is incorporated into this paper reference at this.On the example filter core 1 shown in the concrete parts 48 of the rotation connected structure 47 of discontinuous screw are arranged on, the distance piece 49 that comprises grading ring, each is included in the top 49a of first end, cam face 50, the back side or locking surface 51 and have the end block 52 second end.In use, when filter core 1 is installed in the enclosure, distance piece 49 is axially promoted plate washer or the lug by being positioned at shell, and then along with the rotation of filter core 1, ledge on parts 49 rotations and the shell, lug or parts (being known as second parts of the rotation engaging mechanism with discontinuous screw) locking engages.Rotate normally like this, outer casing member is engage cam surfaces 50 at first, and engages locking surface 51 then, rotates by end block 52 to stop.When this situation occurring, in relevant shell, filter core 1 is axially driven generally along axial direction shown in the arrow 55, sees Fig. 1 and 3, and locked on the throne.This can make axial seal 23 biasings and be held against case surface, is used for sealing.

[0041], comprises groove 58 on the end cap 16 of opening referring to Fig. 3.Groove 58 is provided with the terminal axial overlap with medium 7, and around opening 17.Except other effect, groove 58 provides the gap on the case member during installation.This will be discussed in conjunction with Fig. 5 hereinafter.

[0042] for shown in concrete filter core 1, medium 7 is configured to circular cone (or taper) shape, 10 bearing of trend shrinks downwards gradually from end cap 15 to end cap in peripheral dimension (circumference) upper edge.Cone angle is generally at least 1 °, in 2 ° of-4 ° of scopes of being everlasting, comprises endpoint value.But, should be pointed out that numerous principle as herein described can be applicable to for medium and do not have on the filter element of taper (taper shape) shape, or have on the filter element of more obvious tapering.

[0043] in order to provide external agency to support, and for convenience's sake, external support structure 30 also shrinks downwards on peripheral dimension gradually, extends along medium 7 as it, for example from dust ring 45 towards end cap 10.

[0044] referring to Fig. 2, shown closed end cap 11 comprises optional central indentation 60 on it, has non-circular central accommodation section 61, is arranged to " plus sige " or "+" shape here.Central authorities accommodation section 61 can be used for holding the non-circular ledge on the casing cover, is used for fixing installation.This is disclosed in substantially and openly day is the US publication 2004/0134171 on July 15th, 2004 and was the PCT publication number WO04/039476 on May 13rd, 2004 in open day, more than each part document all be incorporated into this paper reference at this.In Fig. 2, have mark 65 on the shown end cap 11, illustrate filter core 1 is installed to locking and sealing station, and the correct rotation direction that filter core 1 is broken away from from latched position.

[0045] still referring to Fig. 2, should be pointed out that in central indentation 60, between the both wings 61a of non-circular central accommodation section 61, be provided with optional ledge 66.Ledge 66 is arc, and 60 surperficial 60a is outwards outstanding from the accommodation section.Ledge 66 provides the interference with the part of casing cover, if incorrect words are installed.This will be discussed in conjunction with Fig. 5.

Can find out obviously from Fig. 3 and 4 that [0046] axial seal 23 has unique favourable shape and profile construction.But, before the unique construction of describing axial seal 23 in detail, describe the general characteristics of example air filtering device structure earlier, wherein filter element 1 can be set so that use.About this point, referring to Fig. 5.

[0047] referring to Fig. 5, shown air filter 70 comprises shell 70A, and it comprises housing main body 71.Housing main body 71 comprises sidewall 72 and end wall 73, wherein has air stream outlet 74.Shell also comprises air intake 75 (being the side entrance) and dust fall pipe 76 here, has valve gap 77 on it.In an example shown, dust fall pipe 76 is positioned at an end of contiguous air outflow port 74 place's housing main bodies 71; And air inflow aperture 75 is positioned on the contiguous main body 71 ends relative with outlet 74.In some application of the present invention and principle, other schemes are feasible.But, shown structure is preferred, is used for the filter core of the above-mentioned type, has the feature of filter core 1.

[0048] at the 73A place, the inner surface of end wall 73 is set, directed around (promptly around) outlet 74.Surface 73A is the end enclosure sealing surfaces, and above-mentioned body seal structure 22 compresses it, forms axial body seal when being installed in the inside 70B of shell 70A at filter core 1.This will do further discussion hereinafter.

[0049] opposite end walls 73, and housing main body 71 comprises openend 80, by removable access cover 81 closures.When removing access cover 81, filter core 1 can take out from the inside 70B of housing main body 71 or install.

[0050] access cover 81 is fixing on the throne by lock pin 83.

[0051], can observe ledge 66 still referring to Fig. 5.If incorrect rotation of filter core 1 is arranged on latched position, just be difficult to access cover 81 emplaces the ledge 66 because the ledge that covers 85 can be attempted to conflict on the filter core 1.

[0052] to be disclosed in open day be the US publication 2004/0134171 on July 15th, 2004 to a lot of features, in general of shell 70; Open day is the PCT publication number WO 04/039476 on May 13rd, 2004; With the applying date be the U.S. Provisional Application 60/699,136 on July 13rd, 2005, more than each part document all be incorporated into this paper reference at this.For example, housing main body 71 can comprise second parts 84 of the rotation engaging mechanism 47 with discontinuous screw, so that engage with the locking of first parts.Second parts can comprise lug or ledge at interval usually, and are disclosed as U.S.2004/0134171 and PCT WO 04/039476.

[0053] side entrance 75 can be according to application, with any direction rotary steering.Shown example side entrance 75 is tangential inlets, and the air that expression flows into inlet 75 is directed centering on filter core 1 with the rotation form, and by entered the inner surface of sidewall 71 by tangential guiding, described sidewall has the section of circle substantially.

[0054] comprises central ledge 85 on the access cover 81, have non-circular shape, be used to receive the accommodation section 61 of filter core 1, see Fig. 2.For shown in concrete example, ledge 85 has the ledge structure, can engage "+" shape accommodation section.In addition, if the incorrect locking of filter core 1 is on the throne, ledge 85 can engage ledge 66, and the conflict lid is installed.

[0055] general, for shown in example, end cap 10 is composite end caps, comprises inner preform constructions 87 and moulding material 88.Preform constructions 87 can be integrally formed with outer support 30.Preform constructions 87 is understood usually in annular region 87a opening or perforation, and in middle section 87b closure or atresia.This is disclosed in, and for example, US publication 2004/0134171 that open day is on July 15th, 2004 and open day are the PCT publication number WO 04/039476 in May 13 in 2004, and above document is incorporated into this paper reference at this.

When [0056] calibration structure or other structures can be used for guaranteeing that access cover 81 is on being installed to housing main body 71, be positioned at correct position of rotation.

[0057] comprises the cyclone separator structure on the access cover 81, comprise guard shield 90 and spiral slope 91.When air by entering the mouth 75 when entering, it against guard shield 90, is driven into the cyclone pattern by slope 91 between guard shield 90 and sidewall 72.This helps dust-separating, and described dust can finally be discharged by valve 77 by being fallen and pre-separation by dust fall pipe 76.These contents are disclosed in equally and openly day are the US publication 2004/0134171 on July 15th, 2004 and were among the PCT publication number WO 04/039476 on May 13rd, 2004 in open day, more than each part document all be incorporated into this paper reference at this.

[0058], should be pointed out that when filter core 1 is installed in the air filter 70 the dust flange on the filter core 1 or guard shield 45 is provided with and aligns with the shoulder 99 of abutting aperture 100 on the shell or adjacent referring to Fig. 5.Hole 100 provides with the air-flow of dust fall pipe 76 and communicates.Specifically, dust flange or guard shield 45 are provided with the edge of positioned adjacent towards the hole 100 of outlet 74.As a result, in normal work period, dust flange or guard shield 45 stop dust to arrive zone 101, wherein are provided with the rotation connected structure 47 of discontinuous screw.

[0059] referring to Fig. 6, at 105 places, show optional hole site, here the hole can communicate with the space 101 between rotation connected structure 47 with discontinuous screw and the axial seal 23.As the applying date be on July 13rd, 2005, and disclosed at this U.S. Provisional Application 60/699,136 that is incorporated into this paper reference, can allow the environmental pressure in the zone 101 in the hole of this position, this helps to stop dust along dust cover 45 inflow regions 101.Specifically, the pressure in zone 102 is usually less than environmental pressure, and this is because air moves by air filter 70.If zone 101 is in environmental pressure,, dust unlikely occurs and flow into this regional situation owing to be positioned at the hole at 105 places.

[0060], pays close attention to and support 110 referring to Fig. 5.Supporting the 110 inside 7a along medium 7 is provided with.In other words, supporting 110 is arranged in the zone 20 that is formed by medium 7.During operation, support 110 inner support that provide medium 7.Support 110 is installed separately with main filter core 1.Shown support 110 is sealing 115 place's fix in position to the flange 116 of housing main body 71.In an example shown, sealing 115 is o-shape rings.Support 110 comprises the rib 120 of a plurality of elongations, has crossbeam 121 therebetween.Endways 122, support 110 and comprise closed end.Endways 123, outward flange 124 is set, it comprises that o ring 116 is mounted thereto.Flange 124 is overlapped by the end cap 15 on the main filter core 1.

[0061] if desired, support the medium that can comprise on 110, can also be used as safety or auxiliary element so that support 110 as shown in 130.This is disclosed in, for example, WO 04/039476 and U.S.2004/0134171, more than each part document all be incorporated into this paper reference at this.

[0062] referring to Fig. 5, at 130 places, housing main body 71 comprises a plurality of axial ledges, is provided with around hole 131, and extends towards access cover 81.Ledge 130 helps to make during installation support 110 placed in the middle.Comprise groove 140 on the end cap 15, be provided with and divide 130 so that end cap 15 can be removed spaced projections.

[0063] still referring to Fig. 5 and Reference numeral 150, housing main body 71 comprises pressure tap, if desired, is used for erection unit with the pressure in the monitoring outlet 74.

[0064] existing referring to Fig. 4.In Fig. 4, show the cutaway view of sealing 22 and molded end cap 16.Sealing 22 comprises rib, and is outwards outstanding from the adjacent part of end cap 16, the outside vertically direction away from medium 7.Rib 22 has top 160, with relative side 161 and 162.Side 161 is generally known as " madial wall " or " inwall " or its version in this article.In this article, term " interior " is meant such fact, and promptly surface 161 is positioned at the radially inside position of sealing 22, that is, wall 161 is seen Fig. 3 towards central axis 24.Surface 162 is generally known as " outer wall " or " lateral wall " in this article; These terms in this article refer to such fact, promptly wall 162 from seal 22 and the central axis 24 of Fig. 3 radially outward outstanding.

[0065] axial seal ring 23 (sealing 22) is provided with to surround or wound hole 17.Ring 23 is by the other parts and 17 intervals, hole of end cap.

[0066] for shown in example, inwall 161 comprises straight relatively part (section) extend through zone 171; With, wall 162 comprises straight relatively part (section) extend through zone 170.Zone 171 axial length (section) is 1.4mm at least generally, and 1.5-4mm often is 1.5-3mm usually.Zone 170 axial length (section) is 4mm at least generally, and 6-10mm, often 6-8mm usually.Therefore, sidewall 162 is longer than sidewall 161, and the former length is generally at least 1.5 times of sidewall 161 length, is at least 2 times sometimes, when the length with the linearity region 171 of the length of the linearity region 170 of sidewall 162 and sidewall 161 compares.

[0067] common, wall 162 is excircle parts of end cap 16, is positioned at the extension of preformation shell 30.

[0068] in general, sealing 22 (particularly the axial seal ring 23), is one type sealing ring, is known as " horizontal, outside deflectable flexible shaft is to sealing ring " in this article.In this article, when this term and version thereof are illustrated in work, sealing ring 23 (when compacting and rotation against shell when forming sealing) when sealing, along general direction deflection radially outward or the bending of arrow M among Fig. 4.Therefore, axial seal ring 23 is antelabium or skirt sealing, and it is radial and outward deformation when sealing.This passes through the shape of sealing ring 22, size and position, and installation method is realized.

[0069] be appreciated that by above explanation sealing ring 23 is configured to be installed in the shell when using when filter core 1 under pressure and rotational motion, radially outward crooked as skirt.Such operation realizes by some selected shape and size of the part of axial seal ring 23.

[0070] for example, in example shown in Figure 4, top 160 is configured to circular radius.It is outwardly-bent as skirt that this helps the top, is convenient to molded operation simultaneously and can air entrapment.Top 160 can be improved, so that further help outwardly-bently, for example, radius curve is modified into makes that top 160 can further radially outward crooked curve during composition surface during sealing.But, for producing and guaranteeing outwardly-bently, semicircle radius is easily.

[0071] in addition, be set to make in Fig. 4 with the axial distance between base portion B shown in the dimension D 1 and the top 160 less than the radius thickness T, help during the rotation outwardly-bent as skirt if seal 23.

[0072] common, thickness T is at least 1.5mm, often is 2.5mm at least, and is generally 2.5-4.0mm, although other sizes are feasible.Often, thickness T is not more than 5mm, preferably is not more than 4mm.

[0073] common, see Fig. 4 A, the angle B W of part 170 relative axis 24 extensions on surface 162 or be 0 °, perhaps towards the top 160 to stretch out up to about 6 ° angle B W.Usually, see Fig. 4 A, its outward extending angle B W is at least 0.5 °, and in 1 ° of-5 ° of scope of being everlasting, comprises endpoint value, preferred 2.5-4.0.In this article, for convenience's sake, the extension of 0 ° of angle is known as angle for the purpose that defines.If angle B W, is generally 0.5 ° or bigger greater than 0 °, be 2 ° or bigger often, be generally 2.5 °-4 °, help sealing 23 as outwards expansion or crooked of skirt.

[0074] referring to Fig. 3, angle BW can be considered to wall 162 from the outside angle of central axis 24, or with respect to the extension angle of any other structure in the filter core 1, and described other structures are extended and do not had angle with it along the longitudinal axis 24.

[0075] referring to Fig. 4, the straight line portion of wall 161 171 generally extends with 0 ° of angle with respect to the central axis 24 of Fig. 3, or 160 extends radially outwardly with an angle towards the top, and this angle is not more than 6 ° usually, often is not more than 5 °.If straight line portion 171 greater than 0 ° (outwards), at least 0.5 ° usually, often at least 2 °, common 2 °-5 °, in the time of common 3 °-4 °, helps the outside expansion or the bending of axial seal 23 from the extension angle of central axis 24.Often, part 171 can be parallel to part 170 extends, although other schemes are feasible.

[0076] in addition, an advantage of axial seal 23 is that it is configured to see Fig. 5 when being pressed or rotating abutment walls 73A, when sealing to form, laterally to extrinsic deflection or bending.As a result, zone 23 can be outwardly-bent as antelabium, and form favourable axial seal.This schematically shows with mark 175 in Fig. 6.

[0077] Yu at this is incorporated into the U.S.10/691 of this paper reference, 856 compare with the disclosed axial seal structure in PCT U.S./03/33952, the advantage of the hermetically-sealed construction 22 of filter core 1 is, the hermetically-sealed construction in zone 23 can be easily to extrinsic deflection or bending, so that as skirt and shell wall 73A sealing, this helps to make filter core 11 relatively easily to install and lock on the throne.Hereinafter disclosure is used for molded end cap 16 on the throne, and the common preferred material that seals 23.Usually, sealing 22 (being axial seal 23) are when forming end cap 16, and are integrally moulded with the remainder of end cap 16.

[0078] in Fig. 1-3, provides the size of example.These sizes are only represented available example, and principle of the present invention can also be applied on other purposes.The size of example is as follows: AA=150.1mm; AB=166mm; AC=130mm; AD=331mm; AE=82.2mm; And AF=146.6mm.

[0079] in Fig. 4 A, the end cap 16 of example is shown selected size.Can change for other structures, but, provide the example of work structuring here.BA=75.9 ° (in 50 ° of-80 ° of scopes, depending on the following parameter of being discussed usually); BB=11.4mm; BC=14.4mm; BD=16.4mm; The BE=1.0mm radius; The BF=1.5mm radius; The BG=0.8mm radius; The BH=0.8mm radius; BI=29.8mm; BJ=29.4mm; BK=1.8 °; BL=1 °; BM=22.7mm; BN=17.6mm; The BO=1.5mm radius; The BP=0.5mm radius; The BQ=1.6mm radius; BR=5.6mm; BS=2.4mm; BT=0.4mm; BU=0.8mm; BV=3.2mm; BW=3.1 °; The BX=0.5mm radius; The BY=0.5mm radius; BZ=7.0mm.

[0080] above-mentioned size can be used for forming common end cap 16, has axial seal ring 23, and it can be outwardly-bent when filter core is installed in the above described manner.General selected angle B A makes it outwards extend towards the zone 200 near ring 23 from the base portion 140a of groove 140.It is wide that zone 200 is at least 2mm usually, often is that 3-5mm is wide.Angle B A can select, and part is according to the integral diameter of filter core 1.Concerning a lot of structures, aforementioned range is used always.

[0081] size of base portion 14a between area B G and BH is generally 3mm at least, and 4-7mm is wide usually.Inwall 140b is generally dark at least about 2mm, often is that 2.5-4mm is dark.

[0082] in Fig. 6, in the inclination of regional 140C, Z represents with angle among Fig. 4 A.

[0083] at 166 places, show the outside of end cap 15, be arranged on the inside of sealing area 22 and contiguous with it.Zone 166 generally is parallel to media end 165, and perpendicular to central axis 24.We can say, groove 140 by sealing ring 23 around or surround, and inwardly the distance of separation seal ring 23 is at least 2mm, common distance is in the 3-5mm scope.

The shape of the groove [0084] is convenient to extend ledge 131.In addition, during molded end cap 16, the mould structure of the groove 140 of shape and size shown in size be fit to form can conveniently rise, curing resin material, such as the mobile control of polyurethane foam.Specifically, the inclined-plane in the mould of formation wall 140C can guide the perimeter of resin towards mould, and here the molded of sealing ring 23 is important.

II. second example, Fig. 7-10A

[0085] in Fig. 7-10A, shows alternative structure.In Fig. 7-10A, feature similar to the above gives identical Reference numeral.The main difference of structure shown in structure and Fig. 1 shown in Fig. 7-10-6 is groove 280 and end cap 16.Groove 280 has been done improvement by groove 140.Groove 280 correspondences are than the end cap of minor diameter.

[0086] formation of described groove 280 also can be removed the ledge 131 in the shell, and it relate to can be molded other common structures.

[0087] in Fig. 7-9, size is as follows: AI=150.1mm; AJ=166mm; AK=130mm; AL=331mm; AM=82.2mm; And AN=146.6mm.Certainly, other structures can be used other sizes.

[0088] referring to Figure 10 A, size is as follows: CA=53.7 ° (in 50 ° of-80 ° of scopes, depending on the diameter of element in the common application); CB=16.4mm; CC=14.4mm; CD=11.4mm; The CE=1.0mm radius; CF=21.2mm; CG=20.8mm; CH=1.8 °; CI=1 °; CJ=14.7mm; The CK=1.5mm radius; The CL=0.8mm radius; The CM=0.8mm radius; The CN=1.5mm radius; CO=9.7mm; CP=5.6mm; The CQ=1.6mm radius; The CR=0.5mm radius; CS (BW among Fig. 4 A)=3.1 °; CT=3.2mm; CU=0.8mm; CV=0.4mm; CW=2.3mm; The CX=0.5mm radius; The CY=0.5mm radius; CZ=7.0mm.

[0089] general, the groove 280 of Fig. 9 is worked in the mode that is similar to groove 140 shown in Figure 3.

III. examples material and structure.

[0090] principle according to the above description can be implemented on the device of multiple size, shape and structure, and uses multiple material.But, these principle exploitations are used for the application of preferred structure and structure, and have some preferable material.

[0091] although other schemes are feasible, general, shown structure especially has advantage as the air filter of vehicle, described vehicle has the air-flow requirement, under nominal working conditions, and about 1,500 cubic feet/min (cfm) or below, be generally about 300cfm or following; That is, 43 cubic metres or below, usually about 9 cubic metres or below.The air filter of these types is generally on the device that uses small-sized gas or small diesel engine.

[0092] preferred, by described structure, selected polyurethane formulations provides high foam, very soft molded end cap.

[0093] preferred, selected prescription is such, the molded density that it makes end cap (by the parts of polyurethane molding) have is not more than 28lbs./cubic feet (about 450 kilograms per cubic meter), more preferably no more than 22lbs./cubic feet (355 kilograms per cubic meter), usually be not more than 18lbs./cubic feet (290 kilograms per cubic meter), and usually in the scope of 12-17lbs/ cubic feet (192-275 kilograms per cubic meter).If material is made that by preparation it can be controlled so that correct molded and rising then can be used lower density.

[0094] in this article, term " molded density " is meant that weight is divided by the standard definition of volume.Can adopt water displacement test or similar test to determine the volume of the sample of molded foam.When using the volume test, unnecessary pursuit water is absorbed in the hole of porous material and the air of displacement hole representative.Therefore, adopting water volume displacement test to come the working sample volume, is direct displacement, need not wait as long for the air that comes in the replacing material hole.In other words, calculate, only need to use by the represented volume of the periphery of sample for molded density.

[0095] general, the compression load amount of deflection is a physical features, expression robustness, i.e. crushing resistance.Generally, it is measured by making given sample thickness be out of shape 25% required amount of pressure.The compression load flexure test can be carried out according to the ASTM 3574 that is incorporated into this paper reference at this.Generally, the compression load amount of deflection can be assessed in conjunction with old sample.Common technology is the compression load amount of deflection of measuring on the sample, and described sample has solidified under 190 ℉ 5 hours in abundant curing 72 hours or pressure under 75 ℉.

[0096] preferable material is such, when molded, shows the compression load amount of deflection of measuring according to ASTM 3574 on sample, described sample heat ageing 7 days under 158 ℉, average 14psi or following is usually in the scope of 6-14psi, and in the scope of the 7-10psi that is everlasting.

[0097] compressive deformation be to material sample after pressure relief, return to its previous thickness or the height degree assessment (described material has stood the compression of define styles, and the definition condition under).The condition of the compressive deformation of assessment polyurethane material also is provided in ASTM 3574.

[0098] usually desirable material is such, in case solidify, it is about 18% that the compressive deformation of resultant material is not more than, and be generally about 8-13%, and this moment, institute's test sample product were compressed to 50% of its height, and under 180 ℉ maintenance this compress 22 hours.

[0099] general, compression load amount of deflection and compressive deformation feature can be measured with sample plug, and described sample plug is prepared by the same resin that is used to form end cap, or use from the sample in measurement of end cap cutting.Usually, the industrial processes method relates to the sample plug that conventionally test is made by resin material, rather than directly to directly testing from the part of molded end cap cutting.

[0100] can be used for providing have above-mentioned molded density, the urethane resin system of the material of the physical characteristic in compressive deformation and the compression load amount of deflection range of definition, can obtain from a plurality of polyurethane resin prescription merchants easily there, comprise for example BASF AG of supplier, Wyandotte MI, 48192.

[0101] a kind of Available Material of example comprises following polyurethane, and it is 14-22 pound/cubic feet (224-353 kilograms per cubic meter) that the end product that is processed into has " molded " density.Described polyurethane comprises the material made from I36070R resin and I305OU isocyanates, and described material is by BASF AG, Wyandotte, Michigan48192, unique assignee of the present invention Donaldson Company, Inc that is sold to.

[0102] described material mixes with the blending ratio of 100 parts of I36070R resins to 45.5 parts of I3050U isocyanates (by weight) usually.The proportion of resin is 1.04 (8.7 pounds/gallon), and the proportion of isocyanates is 1.20 (10 pounds/gallon).Described material mixes by high dynamic shearing agitator usually.Part temperatures should be at 70-95 ℉.Mold temperature should be 115-135 ℉.

[0103] resin material I36070R is described below:

(a) mean molecule quantity

1) basic PPG=500-15,000

2) glycol=0-10,000

3) triol=500-15,000

(b) average functionality

1) total system=1.5-3.2

(c) hydroxyl value

1) total system=100-300

(d) catalyst

1) amine=air products 0.1-3.0PPH

(e) surfactant

1) total system=0.1-2.0PPH

(f) water

1) total system=0.2-0.5%

(g) pigment/dyestuff

1) total system=1-5% carbon black

(h) blowing agent

1) water.

Being described below of I3050U isocyanates:

(a) NCO content-22.4-23.4wt%

(b) viscosity, the cps=600-800 under 25 ℃

(c) density=1.21g/cm ³, at 25 ℃

(d) initial boiling point-190 ℃ is at 5mm Hg

(e) steam pressure=0.0002Hg is at 25 ℃

(f) outward appearance-colourless liquid

(g) flash-point (Densky-Martins closed-cup)=200 ℃.

[0104] selecting to be used for the material of medium can be different, depends on the availability of expection environment for use and various collapsible substrates.

[0105] can adopt the obtainable traditional sucrose from following supplier, supplier such as Hollingsworth and Vose, East Walpole, Massachusetts.Can predict, on common structure, when using conical component, folded depth is 3/8 inch-3 inches (0.9cm-7.6cm), has around the number of folds of internal diameter be about 10-14/inch (is 15-20/inch in smaller diameter end) than larger diameter end.But, can use the medium of other types and quantity.

[0106] main structural components of main filter element 1 promptly supports 30, generally makes by rigidity plastics, the nylon of filling as glass (for example, 33% glass-filled nylon 6/6,1.5mm is thick).Described parts are generally made by the plastic mould manufacturing, for example injection molding.

[0107] supporting construction 110, see Fig. 5, with the interior support of the filter element 1 of deciding, perhaps with deciding the interior support of filter element 1 and the support of safe filter core, generally form by being similar to support 30 used rigidity plastics.The medium 130 of security filter filter core is preferred problem for concrete application, and is non-folding medium usually, and the side scribbles selected surface modifier, as tackifier.

[0108] preferred, main filter element and support (or secondary filter filter core) be at least 98% containing metal not by weight separately, most preferably 100% containing metal not.

[0109] housing main body 71 is preferably molded by plastic material, and the nylon of filling as glass (for example, the nylon 6/6 that 33% glass is filled, 2mm is thick).For described parts, can adopt molding process.Preferably, case member (except holding bolt by the metal grommet, being used to connect outside miscellaneous part such as truck framework and/or the lock pin) is 98% containing metal not by weight at least, preferred 100% containing metal not.

[0110] for shown in concrete preferred embodiment, the size of lid 87 and shape make it can enough plastic materials molded.Parts guard shield 90 and slope 91 can be made by molding process with nylon or polypropylene that glass is filled.They are can be with lid 83 integrally moulded or can prepare in advance, and are connected to the remainder of lid 83 then, for example by hot melt, use bonding agent or hasp (machinery) to cooperate.

[0111] above-mentioned size, material and the concrete shape that discloses only are exemplary, and do not attempt restriction, unless clearly characterize in claims.But, as can be seen from the above description, how various technology that this paper is disclosed and improvement can be applied in multiple occasion and the special-purpose.

IV. other examples, Figure 11-13

[0112] at first referring to Figure 12.Figure 12 totally comprises the air cleaner assembly that is similar to Fig. 8, comprises improvement as herein described.Parts like the similar Reference numeral representation class.Described improvement is airflow hole (ventilating an or discharging) structure 300, is arranged on the outer shell outer wall 301, between following two positions: (i) dust fall pipe and/or dust cover 310; With, the position of (2) end wall 305, wherein axial sealing ring 322 can form body seal between filter core 331 and shell end wall 305.

[0113] air hole structure 300 provides the pressure that makes in the space 350 near surrounding environment substantially.Space 350 is the spaces in the air cleaner casing 351, at guard shield 310 with seal between 322.It is such space, and wherein, it may be a problem that dust load or dust retain, and has the rotation mounting structure 340 of discontinuous screw with installation or removal filter core 1551 with respect to operation.

[0114] general, in space 350, at the air filter duration of work, pressure can relative surrounding environment reduce, and this is owing to following factor causes: the restriction that is caused by pre-cleaner structure; With, around and enter the air movement of medium bag 371.The effect of air hole structure 300 is that the pressure in the zone 350 can be more near surrounding environment.Therefore, there is pressure differential in tendency between zone 350 and the zone 370.This helps to stop dust to flow to into zone 2005.

[0115] in addition, the effect of guard shield 310 is that any air movement in the zone 350 all can be less relatively, suppressed dust equally and be moved into zone 350.This is being close to or is implementing near the shell shoulder 380 between dust fall outlet opening 381 and the zone 350 by guard shield 310.

[0116] general, air hole structure 300 can be single hole or a plurality of hole.Usually, single hole 300 is just enough.The position in hole 300 can directly communicate with zone 350 (being that direct gas flow communicates) at shell 351 Anywhere.In this article, term " directly " and version thereof represent that the feasible air-flow by hole 300 in the position of hole 300 on shell 351 enters zone 350 from environment, and by any other zone in the shell 351.

[0117] concrete structure shown in Figure 11-13, airflow hole structure 300 is single holes, be positioned near and with dust fall pipe 307 position at interval.This illustrates with enlarged drawing in Figure 13.

[0118] the concrete shape in any dust hole is the problem of selecting in the dust pore structure.Usually, commonly use hole, but this not requirement with circular cross-section.

[0119] size requirements in hole is enough to provide by the minimum pressure differential of shell between inside 370 and environmental area 350.The size of at least 0.003 square inch usually, (corresponding 1/16 inch diameter) is just enough.This is equivalent to the size (that is, diameter is 1.59mm) of about 2.0sq.mm.When using single hole, the largest cross-sectional sized in described hole is generally at least 1/16 inch (.0625 inch or 1.59mm), at least 1/8 inch usually (0.125 inch or 3.18mm).The corresponding diameter of this size is if adopt circular port.Usually, when using single hole, need be greater than the hole of about 1/4 inch (0.25 inch or 6.35mm).If the use circular port, the general corresponding diameter of this size.

[0120] the common unnecessary dust cap that provides on pore structure, as high thickness dielectric or similar structures, but in some system, it may need.Particularly, when below air filter is arranged on the truck hood, preferably on pore structure 300, do not use any medium or screen cloth usually.

[0121] described improvement is specially adapted to use in such air filter, described cleaner uses main filter cartridge arrangement, it has axial seal on filter core, with the dust cover on the filter core, it is provided with contiguous filter core end, has axial seal and enters the mounting structure between dust cover and axial seal on the filter core (as non-rotating screw thread mounting structure) to stop dust.

[0122] on other features, structure can be identical with previous embodiment shown in Figure 11-13.But, should be pointed out that referring to Figure 12 and Figure 13 that shown filter element 500 comprises aforesaid many features, but have the end cap 501 of opening, its relative foregoing data has been done to revise a little, that is: sealing area 322 has two parallel side; With, groove 540 has different slightly shapes.These difference just help expression according to principle of the present invention, and how feasible replacement scheme is.

[0123] should be pointed out that the structure shown in Figure 11-13 is that the document is incorporated into this paper reference at this shown in the U.S. Provisional Application 60/699,136 on July 13rd, 2005 in the applying date also.

Claims (23)

1. filtering element for air filter comprises:

(a) first and second opposite ends;

(i) described first end has end cap, and described end cap has airflow hole by therebetween;

(b) filter medium that between first and second ends, extends;

(c) external frame has side wall construction, centers on medium in the position near first end at least, and has outer surface;

(i) described filter core comprises first parts of the rotation engaging mechanism with discontinuous screw, is arranged on the outer surface of external frame; With

(d) horizontal bandy flexible shaft is positioned on first end cap to sealing ring, and around described airflow hole.

2. filtering element for air filter according to claim 1, wherein:

(a) described axial seal ring has inwall, outer wall and top;

(i) extension of the thickness T of described axial seal ring between the radially overlapping portion of described inner and outer wall is not more than 4mm.

3. filtering element for air filter according to claim 2, wherein:

(a) described outer wall comprises the part that 4mm at least is long, the angle B W that the vertical central axis of its relative filter element extends be 0 ° or more than, extension is that the remainder from described filter core stretches out towards described top.

4. filtering element for air filter according to claim 3, wherein:

(a) described outer wall comprises the long part of 4mm at least, and the outward extending angle of its relative vertical central axis is 1 °-5 °.

5. filtering element for air filter according to claim 4, wherein:

(a) described inwall comprises the part that 1.4mm at least is long, and the vertical central axis of its described relatively filter element extends with 0 ° or above angle, and extension is that the remainder from described first end cap stretches out towards described top.

6. filtering element for air filter according to claim 5, wherein:

(a) angle B W is in 2.5 °-4 ° scope;

(b) described inwall comprises the part parallel with described outer wall; With

(c) thickness T is 2.5mm at least.

7. according to the described filtering element for air filter of arbitrary claim among the claim 1-6, wherein:

(a) described axial seal ring is positioned at the periphery of described first end cap.

8. according to the described filtering element for air filter of arbitrary claim among the claim 2-7, wherein:

(a) straight line portion of described outer wall than the straight line portion of described inwall to 1.5 times of the youthful and the elderlys.

9. according to the described filtering element for air filter of arbitrary claim among the claim 1-8, wherein:

(a) described axial seal ring and described first end cap are integrally moulded.

10. according to the described filtering element for air filter of arbitrary claim among the claim 1-9, wherein:

(a) described first end cap comprises groove disposed thereon:

(i) center on by described axial seal ring; With

(ii) terminal overlapping with described filter medium;

(iii) described groove is 2mm at least from the degree of depth of the adjacent external surfaces of first end cap part.

11. filtering element for air filter according to claim 10, wherein:

(a) described groove is provided with the described axial seal ring of distance 2mm at least.

12. filtering element for air filter according to claim 11, wherein:

(a) described groove comprises inwall, outer wall and base portion;

(i) 3mm is wide at least for described base portion.

13. filtering element for air filter according to claim 12, wherein:

(a) described groove outer wall outwards shrinks from described base portion gradually with respect to the acute angle of described media end with 50 °-80 °.

14. according to the described filtering element for air filter of arbitrary claim among the claim 1-13, wherein:

(a) described external frame is extended between first and second ends of described filter element fully.

15. according to the described filtering element for air filter of arbitrary claim among the claim 1-14, wherein:

(a) described first end cap and sealing ring comprise integrally moulded foamed polyurethane.

16. according to the described filtering element for air filter of arbitrary claim among the claim 1-15, wherein:

(a) first parts of rotation engaging mechanism comprise grading ring on the outer surface of external frame.

17. filtering element for air filter according to claim 16, wherein:

(a) each section of grading ring has first and second opposite ends: wherein:

(i) first end of each section has the top; With

(ii) second end of each of grading ring section has block.

18. according to the described filtering element for air filter of arbitrary claim among the claim 1-17, wherein:

(a) described external frame is extended to described second end from described first end, and comprises;

(i) the guard shield part of atresia, contiguous described first end, and extend at least 10% axial distance of the axial length that covers external frame; With

(ii) perforated portion has at least 50% the open area of extending between the described guard shield part and second end; The axial length that described perforated portion has be described external frame axial length at least 50%.

19. according to the described filtering element for air filter of arbitrary claim among the claim 1-18, wherein:

(a) described external frame comprises the dust cover that extends radially outwardly, and having radially, the extension is of a size of 4mm at least.

20. according to the described filtering element for air filter of arbitrary claim among the claim 1-19, wherein

(a) described medium has tapering part, inwardly shrinks extension gradually towards second end.

21. an air filter comprises:

(a) shell comprises housing main body and access cover;

(i) described housing main body comprises the end with maintenance opening, and access cover is installed on it;

(ii) described shell comprises air flow inlet and air stream outlet; With

(A) described air stream outlet is arranged on the end wall of described housing main body, and has the terminal relative of access cover; With,

(B) described end wall has axial seal surface, around described air stream outlet;

Second parts that comprise rotation engaging mechanism on the (iii) described housing main body with discontinuous screw; With

(b) according to the described filtering element for air filter of arbitrary claim among the claim 1-20, be arranged in the described shell, wherein:

(i) against described housing main body end wall axial seal surface, described axial seal ring is radially outward crooked to sealing for described axial seal annulate shaft; With,

First parts that (ii) have the rotation engaging mechanism of discontinuous screw engage with second parts locking of the rotation engaging mechanism with discontinuous screw.

22. air filter according to claim 21, wherein:

(a) filter element is a filter core according to claim 19; With,

(b) described housing main body comprises that airport passes through therebetween, communicates with zone between the dust cover that radially extends on axial seal ring and the filter element.

23. an air filter comprises:

(a) shell comprises air flow inlet, air stream outlet, dust fall pipe and main filter case axial seal end surfaces;

(b) removable service cover; With,

(c) maintainable main filter element comprises:

(i) medium extension forms the inner space and extends between the first and second relative end caps;

(ii) be positioned at the axial seal on described first end cap;

(iii) from the outwards outstanding shell engaging mechanism of described filter element; With

(iv) radially outward outstanding dust cover around described filter element, makes described shell engaging mechanism in a position between radially outward outstanding dust cover and described axial seal;

(d) described maintainable main filter element is positioned at described shell; Wherein:

(i) sealing of the axial seal of described main filter element is against described main filter case axial seal end surfaces;

Shell engaging mechanism on the (ii) described main filter element engages with described shell, so that described main filter core is fixing on the throne; With

Radially outward outstanding dust cover on the described filter element (iii) is set,, described shell engaging mechanism is set wherein to form the first area between described dust cover and the axial seal; With,

(e) described shell comprises that the airport structure by therebetween, is arranged on a position of shell, carries out direct gas flow with the first area between dust cover and the axial seal and communicates.

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