CN100509114C

CN100509114C - Two-stage air filter

Info

Publication number: CN100509114C
Application number: CNB028287258A
Authority: CN
Inventors: K·A·布罗尼尔; S·W·马修斯; A·L·布雷顿非尔德; E·W·耐齐尔
Original assignee: Greenheck Fan Corp
Current assignee: Greenheck Fan Corp
Priority date: 2002-03-01
Filing date: 2002-03-01
Publication date: 2009-07-08
Anticipated expiration: 2022-03-01
Also published as: CN1625430A; EP1487562A1; AU2002248526A1; CA2478383C; MXPA04008478A; EP1487562A4; CA2478383A1; WO2003084643A1

Abstract

A two stage air purification system is provided for the removal of airborne impurities from an airflow prior to the airflow entering a building's ductwork. In particular, a primary air filter is mounted within the hood of, for example, a cooking area and operable to receive grease laden air and remove a portion of the impurities. The air is then sent to a secondary filter, also mounted within the hood, that removes additional impurities. The air is then sent through the building's duckwork and eventually out the building.

Description

The two-stage air cleaner

Technical field

Relate generally to air cleaner of the present invention relates to the air cleaning system that is used for commercial kitchen especially.

Background technology

Air cleaning system is mainly used to extract impurity, for example, removes grease in the air of the band grease that forms from commercial kitchen and other similar environment in cooking process.The oil extraction device normally is arranged on the capable of washing or parts changed of the kitchen exhaust system of the cooking zone top such as cooking stove.Fan in the exhaust system extracts the air that carries grease and passes through filter medium, and before air was discharged in the atmosphere, filter medium intercepted grease from air.The grease of intercepting flows down along filter wall, and collects to do suitable processing, and perhaps grease can collect in the filter media that in the future can clean.

Traditionally, primary air filter is installed on the petticoat pipe of cooking zone, so that finally be discharged to by the flue system of building at air before the environment of outside, removes the particle that a large amount of greases and other air carry.A level air cleaner is positioned at the exit of building flue system, so that before air discharges, removes less air plankton in addition.Various filters are available for such air cleaning system.

Traditional centrifugal type air filter causes air to enter the interior spirality channel of cyclone chamber, and makes impurity stand centrifugal force.Impurity expels the whirlwind center and strikes on the whirlwind locular wall.Air withdraws from cyclone chamber and impurity is stayed within.Such centrifugal type air filter is found in the U.S. Patent No. 6,251,153 that is entitled as " centrifugal type air filter ", and the full content that this paper quotes this patent for your guidance.The advantage of centrifugal type air filter is that the air plankton of extraction flows down along filter wall, and is collected to do suitable processing, thus, and to cleaning and can causing other the needs of maintaining of down time to reduce to minimum.Although such air cleaner is that effectively less impurity still can remain in the air, and moves in the flue system and fan of building at can the fiercely attack big air plankton of filter wall of removal.

Baffle filter forms a cavity, and it has the inlet that the air of grease is carried in an admittance.This cavity forms a plurality of baffle plates, and they force air several times ground flip-flop direction of motion before withdrawing from filter.Because air changes direction, grease and other impurity are evicted from air stream, and bump whirlwind locular wall.Then, grease can flow down and enter in the collection cups.

Be referred to as the filter of the another kind of type of impact filter, comprise that traditionally one fills up the wire mesh bed of filtering particle.Because air is drawn through impact filter, so medium will be subside impurity therein, with the air of output than cleaning.Although impact filter is suitable for the big particle of centrifugal fan and can is successful aspect the escape smaller particles from centrifugal fan in removal, it depends on filter media, in the quite short time, and a large amount of foul of they regular meeting's accumulation.This accumulation is blocked air by therebetween, and the significant pressure that filter is traversed in this generation falls, and the air mass flow of restricted passage cleaning system and the air final cleannes by therebetween.Therefore impact filter needs frequent cleaning and maintaining.

The air cleaning system of even now is applicable to the purpose of its requirement, but the organic compound (VOC) of grease and other volatilization is tending towards being accumulated in the flue system, thus, needs regular maintenance and cleaning.

Therefore, needing to provide a kind of reliable air cleaning system, and it can remove big and little particle from air before air enters the building flue system.

Summary of the invention

The invention provides an air cleaning system, it is used for admitting in inflow air that contains impurity and the flue system of the exporting the building that purifies air.This system comprises a petticoat pipe, and it forms a petticoat pipe outlet that is communicated with flue system.One primary filter parts are installed on the petticoat pipe, are used for admitting flowing into air, therefrom remove at least a portion impurity, and export a preliminary air stream.Level filter component is installed on the petticoat pipe at downstream portion place of primary filter, and admits preliminary delivery air stream.Secondary filter member has secondary filter media, and its operation can be removed impurity from primary air stream, and exports level air and flow to the petticoat pipe outlet, and it is cleaner than primary air stream.

A general purpose of the present invention provides a clean air package, it in air stream is flowed through buildings internal before, realize the improved impurity that from air stream, contains in the extraction air.By provide one remove impurity first filter component and-remove second filter component of other impurity, a cleaner air outputs in the flue system, therefore, reduces to safeguard the frequency of flue system.

From the following description, will be appreciated that above-mentioned purpose and advantage with other of the present invention.In the description of this paper, with reference to constituting the accompanying drawing of this specification part, for illustrative purposes, and do not have a limiting sense, in all accompanying drawings, demonstrate embodiments of the invention.These embodiment do not necessarily represent four corner of the present invention.Therefore, should be with reference to the appended claims of explaining the scope of the invention.

Brief description of drawings

With reference to following accompanying drawing, wherein, identical label is corresponding to components identical in the full text, in all accompanying drawings:

Fig. 1 is the side view that has according to the exhaust hood of the primary air filter of preferred embodiment structure and secondary air filter;

Fig. 2 is the stereogram that is shown in the decomposition of the exhaust hood among Fig. 1, to further specify primary air filter;

Fig. 3 is the partial front perspective view of the main cross section of primary air filter shown in Figure 1;

Fig. 4 is the side cross-sectional, view of the air cleaner shown in Figure 3 of 4-4 interceptings along the line;

Fig. 5 is the stereogram of petticoat pipe shown in Figure 1, and wherein, part office cuts open and illustrates removing of filter;

Fig. 6 is the stereogram that the secondary air filter shown in Figure 1 of inlet is shown;

Fig. 7 is the stereogram that the secondary air filter shown in Figure 1 of outlet is shown;

Fig. 8 is the side cross-sectional, view of the secondary air filter shown in Figure 7 of 8-8 interceptings along the line;

Fig. 9 is the view that is used for according to the porous filter medium of the secondary air filter of preferred embodiment;

Figure 10 is the view that is used for according to the non-porous filter media of the secondary air filter of an embodiment who changes;

Figure 11 is the side view according to the exhaust hood of the of the present invention one embodiment structure that changes.

The specific embodiment

At first with reference to Fig. 1, one is applicable to the air cleaning system of oil and grease extracting and other particle such as VOC (VOC) from the air that carries grease, is installed on a jiao of an end place of the exhaust hood 12 that is arranged on (not shown) top, food cooking zone.The outlet of duct collar 27 is led in petticoat pipe 12 formation one, and duct collar 27 provides the butt joint interface of the flue system (not shown) from the petticoat pipe to the building.Especially, a primary air filter 18 is mounted obliquely within the petticoat pipe 12, and it forms a cavity 21 that is arranged between filter and the outlet duct collar 27 together with the inwall of petticoat pipe.This cavity 21 guarantees to have only the air that filters can flow into duct collar 27.One time level filter 22 also is mounted obliquely within the petticoat pipe, the position in the cavity between primary filter 18 and duct collar 27.Particularly, lower and upper guided

way

126 and 127 traverses respectively that petticoat pipe 12 laterally extends and the outer end (will describe in detail hereinafter) of supporting filter device 22.

In operating process, the air 16 that fan (not shown) suction has grease enters petticoat pipe 12, and by primary air filter 18, thereby from air, remove big particle.The air 20 that this part cleaned aspirates basically by secondary air filter 22, so that remove littler particle from the air that primary filter 18 was removed.Therefore, " totally " air 24 is discharged by duct collar 27 from petticoat pipe 12, and flows through inner flue system and flow out building.Advantageously, the inside flue system of building as the traditional system that uses a level filter in the exit of building flue system apace by and do not accumulate foul and grease.

In particular with reference to Fig. 2-4, primary air filter 18 has-and antetheca 26 is connected rear wall 28 on its periphery with one by a roof 30, diapire 32 and relative sidewall 34.Be divided into a plurality of whirlpool chambers that separate 35 by all

walls

26,28,30,32 with 34 inner chambers that form.

Each whirlpool chamber 35 has a pair of inlet 36 that is positioned at 38 places, whirlpool chamber 35 opposite ends, and one is positioned at the single outlet of locating in the middle of the whirlpool chamber 35 39.The air 16 that has grease enters whirlpool chamber 35 by a pair of inlet 36 that is formed in the filter front wall 26, and withdraws from whirlpool chamber 35 by the outlet 39 that is formed in the filter rear wall 28.Filter 18 is caught grease by the air 16 that has grease along the spirality path guiding through whirlpool chamber 35.Spirality path causes and is suspended in airborne fat particles and strikes on the whirlpool locular wall, then, flows into bleeding point along locular wall.Form inlet 36 near relative chamber end 38, can prevent to enter and respectively enter the mouth 36 air 16, and avoid spirality path directly by outlet 39.This guarantees the grease of extraction maximum from air 16.

According to preferred embodiment, filter 18 comprises that one has the tray-shaped base 40 of filter front wall 26, and roof 30, diapire 32 and sidewall 34 form filter perimeter.All

walls

30,32 and 34 extend back vertical with antetheca 26 basically, with the inner chamber 41 that forms a dish type.Separate all demarcation strips 42 and base plate 40 cooperations of inner chamber 41 and formation whirlpool chamber 35, they are installed in the inner chamber 41.Base plate 40 is preferably formed by single sheet material, so that eliminate the cleaning of stitching and being convenient to filter front wall 26.

Paired inlet 36 is formed in the antetheca 26, and provides an inlet to the air that has grease 16 that enters whirlpool chamber 35.Paired inlet 36 is spaced apart along antetheca, is arranged essentially parallel to downside wall 34.Preferably, antetheca 26 is out of shape backward, and 36 places form eddy generator 44 at each to enter the mouth.Eddy generator 44 guiding air 16 enter the spirality paths of inlet 36 in inflow chambers 35 46, center, chamber.

Demarcation strip 42 remains on inner chamber 41 by the folding wings 48 that is positioned at demarcation strip 42 tops that are inserted in wherein.Watch Fig. 4 especially, folding wings 48 is formed on the back edge of base top 30 and the end 32 and side 34, and they are folding and the demarcation strip 42 of interlocking is remained in the base plate inner chamber 41.Advantageously, the air that folding folding wings will be leaked from whirlpool chamber 35 on demarcation strip reduces to minimum.Adopt method known in the art, for example, adopt intermittent weld, spot welding, screw type securing member etc., folding wings 48 is fixed on each base corner and the limit, does not carefully discharge demarcation strip 42 to prevent folding wings 48.

Whirlpool chamber 35 is discharged in all holes 50 that impinge upon in the base bottom 32 at 38 places, end of grease by being punched in each whirlpool chamber 35 on the whirlpool locular wall.Load in the process of heavy oil fat at filter, be similar to heavy culinary art operation, eddy generator 44 can become and loaded by grease.This heavy grease loading can develop into antetheca 26 and become bad.In order to prevent that whole antetheca 26 from fully becoming bad, can form little skylight 52, for example, just, the skylight is die-cut in the front below the eddy generator 44 at 36 places that respectively enter the mouth of filter top.Adopt the skylight 52 of two misarrangements row to cover whole film (left-to-right).Guarantee in the skylight 52 of stagger arrangement will be by the sky window capture from any flowing of eddy generator 44.

Skylight 52 only need be formed on the top of filter, rather than on the bottom, makes filter directed from the top to bottom especially.Yet if do not require the skylight, hole 50 can be punched in the base top 30 and the end 32, is not installed in the petticoat pipe 12 with respect to the filter top 30 and the orientation at the end 32 to allow filter 18.

In order to simplify filter assemblies 18 and to reduce assembly cost, whirlpool chamber 35 forms by the demarcation strip 42 that interlocking is inserted in the inner chamber 41.Elongated L shaped demarcation strip 42 is inserted in the tray cavity 41, and cooperates with the demarcation strip 42 of base plate 40 and vicinity, to form elongated whirlpool chamber 35.Each demarcation strip 42 extends the width of base plate 40, and has the rear wall 37 that a sidewall and that is arranged essentially parallel to sidewall of the bottom plate 34 is arranged essentially parallel to antetheca 26, so that form the rear wall 28 of filter.The rear wall of each demarcation strip 42 is arranged on the top of the right inlet 36 of difference, and has approximate centre ground formation groove therein, to form the outlet 39 of chamber.The neck-in of divider rear wall and sidewall, and in abutting connection with base plate 40 or adjacent divider 42, leakage of air is reduced to minimum.

Demarcation strip 42 preferably adopts the process identical with base plate 40 to be processed to form by identical materials, and carries out interlocking and simplify filter assemblies 18.The contact pin that is formed in each demarcation strip extends in the groove that is formed in the contiguous demarcation strip 42, so that adjacent divider 42 is locked together.This contact pin and groove structure do not need the method in the inner chamber 41 that each demarcation strip 42 is fixed on of spot welding or other.

By the whirlpool chamber 35 with preceding inlet 36 and back outlet 39 is provided, air enters and withdraws from filter 18 along parallel direction basically, so that air can easily enter secondary filter 22 (will be described in more detail below).This structure also further provides a filter 18 more compact with respect to following a kind of air cleaner, and in this air cleaner, air withdraws from air cleaner to be substantially perpendicular to the direction of air that enters filter, such as by the chamber end.In addition, a back outlet air filter does not require the hood that is fit to especially, withdraws from the chamber end with the guiding air and enters petticoat pipe.

In another embodiment, base plate, demarcation strip or its part are coated with the lubricant of doing, and for example, as are entitled as United States Patent (USP) 6,050, the 258 described lubricants of " exhaust fan that has dried lubricant coating ", and the paper quoted in its entirety by reference.

Should be realized that traditional centrifugal type filter can not be removed all greases and other impurity from the air that has grease.For this reason, secondary filter is installed in the exit of building flue system traditionally, so that further removed pollutant before air is discharged in the environment.Yet, in the inside of flue system and petticoat pipe space, stay grease, Dirty thing and mud by the air that partly cleaned of primary filter output, thus, need to clean frequently and maintaining.

According to preferred embodiment, level filter 22 is installed in the petticoat pipe of downstream position of the primary air filter 18 in the cavity 21, and the air (primary air stream) that cleaned from the primary filter receiving portion.Should be realized that employed term " downstream " is for the direction of

air stream

16,20 and 24 here.As will hereinafter be described in detail, secondary filter 22 is impact filters, and its filter medium comprises pearl (porous or non-porous), and they remove other impurity from air 20.Yet, should be realized that the term " filter media " that broadly uses is used for defining any operation and removes the particulate filtration device mechanism of carrying in the air, comprises the structure of centrifugal type filter 18 herein.Therefore, clean air (secondary airflow) 24 is exported, and is extended and be connected to duct collar 27 admittances of buildings internal from petticoat pipe 12.Therefore air 24 can directly flow out building, is not further cleansed, and thus, increases the time interval between the regular pipeline cleaning, and reduces the risk of fire.In addition, because secondary filter 22 is arranged in the petticoat pipe 12, so when filter was cleaned, the user is easier to enter.

Referring now to Fig. 6-8, secondary filter 22 comprises a framework 61, and it forms one and operationally admits the front 60 that flows into air.Front 60 has outer peripheral edges, and it is formed by roof 62, diapire 64 and relative end wall 66.One rear surface 68 relatively is provided with front surface 60, and the air that allows to clean withdraws from filter 22.The inner chamber that is formed by all

walls

62,64 and 66 is traversed the

demarcation strip

71 and 73 that extends front 60 and is separated into two outer

air intake chambers

70 and 72, and the air intake chamber 74 in the middle of.The inlet of three chambers is led in front 60 formation one.Will recognize that from the following

description intake chamber

70,72 and 74 shape provide a bigger surface to flowing into air, thus, compare, increase the efficient of filter 22 with traditional flat filter design.

Here employed rear surface 68 collectively identifies the rear wall of the correspondence of each intake chamber, should be realized that, the rear surface needs not to be a flat or continuous wall.For example, the rear wall 68 at outer chamber 70 places is formed by first and second outer walls 75 and 77 respectively.Especially, first wall 75 stretches out with 45 from the front end 80 of diapire 64.Second wall 77 is from the front 60 (therefore, with respect to front 60 form a 45) of far-end to extend to chamber 70 in 90 ° of angles of wall 75.First and second walls 75 and 77 form roughly a right angled triangle (as shown in Figure 8, when from cross-sectional view) together with front 60.

First wall 75 by in one pair and outer woven wire 76 and 78 form, they extend parallel to each other, and spaced apart and form a gap that holds filter media 89 betwixt.Similarly, second wall 77 forms with outer woven wire 82 and 84 in one pair respectively, and they are connected to the outer end of silk screen 76 and 78 respectively.Silk screen 82 and 84 extends parallel to each other, and spaced apart and form a continuous gap with silk screen 76 and 78.Silk screen 76 and 78 far-end be by a Grip 86 sealings, and silk screen 82 and 84 far-end are by an inner clamp 88 sealings.The cavity that is formed by two pairs of silk screens and clip 86 and 88 is guaranteed will be by filter media 89 by the air of chamber 70.

Rear surface 68 at intermediate cavity 74 places is formed by 60 vertically outward extending two sidewalls 90 from the front are connected the outer end of sidewall 90 with one the roof that extends laterally 92.Wall 90 and 92 forms the chamber 74 (when from cross-sectional view) of an essentially rectangular together with front 60.With outer woven wire 94 and 96, they departed from a predetermined distance each other, to form a space that holds filter media 89 betwixt in sidewall 90 comprised respectively.In roof 92 comprises respectively and outer paired silk screen 98 and 100, in they are connected to respectively and the outer ends of outer silk screen 94 and 96, and apart from one another by and form one betwixt and also be filtered the gap that device medium 89 occupies.Silk screen 94 and the inner of 96 are sealed by clip 102, guarantee that to form a cavity all air that enter intermediate cavity 74 will be by filter media 89.

Outer chamber 72 is similar to chamber 70, and is formed by a first wall 104, and this wall stretches out with 45 from the front end 81 of roof 62.-the second wall 106 extends in 90 ° of angles towards the front 60 of chamber 72 from the far-end of wall 104.For example, rear surface 68 forms outer chamber 72 by first and second walls 104 and 106 thus respectively.First and second walls 104 and 106 form roughly a right angled triangle (when from cross-sectional view) together with front 60.

First wall 104 by in one pair and outer woven wire 108 and 110 form, they extend parallel to each other, and spaced apart and form a gap that holds filter media 89 betwixt.Similarly, second wall 106 respectively by in one pair and outer woven wire 112 and 114 form, they are connected to the outer end of silk screen 108 and 110 respectively, and are also spaced apart and hold filter media.Silk screen 112 and 114 extends parallel to each other, and spaced apart and form a gap that holds filter media 89.Silk screen 108 and 110 far-end be by a Grip 86 sealings, and silk screen 112 and 114 far-end are by an inner clamp 88 sealings.Guarantee that by the cavity that two pairs of silk screens and clip 86 and 88 form all air that enter chamber 72 will pass through filter media.

In operating process, leaked-in air 20 is admitted perpendicular to the front 60 of secondary filter 22, and is directed to each

chamber

70,74 and 72.Then, air 20 is by forming the interior silk screen of chamber wall, wherein, withdraws from before the filter 22 by outer silk screen, and the particle that air has is filtered the device medium and removes.Before being discharged to outdoor environment, the secondary air 24 of cleaning guides the inside flue system that passes through duct collar 27 and pass through building then.

Interior and the outer silk screen preferably spaced apart one of wall that forms

chamber

70,72 and 74 is less than one inch distance,, but should be realized that preferably less than 1/2 inch according to preferred embodiment, can adopt any distance according to the present invention.Advantageously, can be positioned to sufficiently separate with outer silk screen in having determined already, the filter media bed for a given air flows and fills up is not more than 2 water column height so that traverse the pressure drop of secondary filter 22, and this will describe in detail hereinafter.

Because the air that flows through filter 22 can apply the pressure of a significant quantity on chamber wall, all walls 116 supportings that the outer surface of the outer silk screen of each chamber is extended between the end wall 66 of junction between two silk screens.All walls 116 also are used as and seal each interface, to guarantee entering all air of secondary filter 22 by filter media 89.Silk screen also is connected the beam that extends laterally 118 supportings of the mid point of wall 116.A pair of wall 120 60 extends along the front, and surrounds clip 88 and 102, so as

outer chamber

70 and 72 and intermediate cavity 74 between a sealing is provided at the interface.Therefore, all walls 116 prevent from also to flow into that air 20 flows through filter 22 and by filter media 89.

Although chamber wall has been described as being formed by interior and outer woven wire in this article, should be realized that Zhu Bike is made by any suitable porous, as long as they can provide the enough air mass flows by therebetween.

Referring now to Fig. 9 and 10, filter media 89 comprises roughly spherical pearl 91, and they can absorb grease from leaked-in air 20.In manufacture process, one first end plate 66 is attached on wall 62 and 64.Pearl 91 is poured between the interior of the other end and outer chamber silk screen, to form a pearl bed that fills up or any bed that is applicable to other material of the present invention.Second end plate 66 is basically attached the enclosed cavity locular wall.Should be realized that the diameter of pearl can change, but be popularly designed for 1 and 4mm between diameter.Pearl 91 can be removed not less impurity in the air of being removed by primary air filter 18.Advantageously, because end plate 66 is attached to framework by the nuts and bolt (not shown), so the end user can remove end plate 66 and with the pearl of crossing 91, and new pearl 91 is inserted in the filter, and need not changes whole filter 22.

In particular with reference to Fig. 9, pearl 91 is porous, and can comprise silica gel, pottery, diatomite, zeolite, or any other porous material, and they are considered to sufficiently suitable and durable and can be made as the form of pearl shape, and are filled within the filter.Because compare with water vapour, it has high affinity to grease, so, adopt silica gel according to preferred embodiment.Although the past uses silica gel as oil strainer always, the present invention recognizes that silica gel also can be used to remove grease and other impurity (for example, VOC) from the air that has grease.

In operating process, the air 20 that has grease enters by chamber wall and by pearl 91.It causes leaked-in air to do the unexpected variation of several times on direction to 91 on pearl as baffle, so that is suspended in airborne grease and other particles hit on pearl and be absorbed in the space 124 of filter media 89 in course of normal operation.Advantageously,,, thus, can make air, not produce significant pressure drop and traverse chamber wall easily by filter 22 so there is not the Dirty thing in the gap between the contiguous porous pearl because impurity is stored in each pearl 89.In case it is saturated that pearl becomes, grease can begin to be accumulated in the air gap between contiguous pearl 91.Therefore, can require to install a collection cups (not shown), admit any grease (being described) that accumulates with reference to Figure 10.

Especially, filter media 89 can comprise non-porous pearl 93 with changing, for example, and metal pearl, glass bead, or be applicable to any other non-porous material of the present invention.According to this embodiment, the grease that has in the air and other impurity strike on the pearl, and are accumulated in the air gap 125 that is formed between the contiguous pearl.When impurities accumulation, the pressure drop of traversing chamber wall begins to rise, and is enough big up to pressure drop, breaks away from till the pearl 89 so that leaked-in air drives grease.Filter 22 comprises a collection cups (not shown), and when adopting non-porous pearl 93, it is used for catching impurity.

Should be realized that to also have other filter media 89 to can be used for secondary filter 22.For example, filter media 89 can comprise the ceramic structure of porous, and it is the shape of the inside that is formed by any wall 75,77,90,92,104 and 106, and like this, but all wall cavity ceramic structures are made.According to this embodiment, leaked-in air 20 is by the structure of porous, and its porous absorbs the impurity of not removed by primary air filter 18.Found that ceramic filter media presents the enough affinity of grease than water vapour, therefore, be applicable to the filter media in the secondary filter 22.

The primary and secondary filter can use the dish-washing machine cleaning fluid of commercial dish-washing machine and standard to remove grease and VOC in the hope of regeneration.In some cases, fully extend through such as the hole in the situation of pearl, filter should be immersed in the solution of commercial cleaning agent, so that remove in commercial dish-washing machine before the grease, removes the grease that has absorbed earlier.

With reference to Fig. 5, primary and

secondary filter

18 and 22 rests on guided

way

126 and 127, and they are convenient to take off from petticoat pipe 12.Fig. 5 illustrates removing of secondary filter 22, but should be realized that, primary filter 18 can take off in the same way.Especially, a pair of handle 128 extends from the front of end wall 66, so that can easily take off and transport of filter 22.Guided

way

126 and 127 spaced apart one enough distances so that a user can upwards promote filter 22 facing to the lower limb of last guided way 127, turn over corresponding following guided way 126 so that the gap to be provided with diapire 64.In case a wall 64 breaks away from guided

way

126 and 127, upper wall 62 can easily shift out from organizing the engaging of guided way with another.Should be realized that, can use similar system that primary filter 18 removably is installed.

Now refer again to Figure 11, according to of the present invention one embodiment that changes, a flat secondary filter 122 can be installed in the downstream of primary filter 18.Yet, should be realized that to have the petticoat pipe that primary air filter 18 only is installed, businessman manufactures it and is used in such system at present, and this system uses a level filter in the exit of the internal pipeline system of building.Because secondary filter 122 is flat,,, simultaneously, support enough air mass flows so that provide an enough big surf zone to come effectively and clean air 20 reliably so it must be more elongated than filter 22.Yet the position of the primary filter 18 in the legacy system does not allow an enough elongated secondary filter to be installed in the cavity 21.Therefore, primary filter 18 need be moved back in the petticoat pipe 12, so that hold another elongated secondary filter 122.The installation of flat secondary filter 122 requires to revise the manufacture process of petticoat pipe 12 thus, and this can consume additional expense and resource.

Advantageously, the chamber wall 75,77,90,92,104 of filter 22, and 106 60 stretch out at least in part from the front.Therefore, filter 22 is provided by the degree of depth that provides in lateral distance that traditional petticoat pipe 14 allowed and the cavity 21, obtaining the surf zone bigger than flat filter 122, and does not occupy the relatively large lateral space in the petticoat pipe 12.Known traditional filter wall extends upward from front surface and reaches 45 °.Yet the wall 90 of secondary filter 22 extends upward from front surface and reaches 90 °, should be realized that, will provide surf zone greater than prior art with respect to any angle greater than 45 ° of front surface 60.The surf zone of the increase that reaches by

chamber

70,72 and 74 can have the bigger flow that passes through filter 22 and also obtain a high efficient.Therefore, preferred embodiment can make secondary filter 22 be installed in the petticoat pipe 12, and need not revise hood/primary filter and increase traditional manufacturing and assembling.

Although the present invention is described with reference to an elementary centrifugal type air filter 18 and a level impact type air cleaner 22, but should be realized that, other filter also can be used for such air cleaning system, it has the first order and a level thereafter of collecting the large-size particle that contains in most of air, enter at air before the internal pipeline system of building, in this back level, remove the smaller particles in the first order, do not removed and such as the non-particulate pollutant of VOC.For example,

filter

18 and 22 can comprise any one in centrifugal type filter, baffle formula filter, the impact filter, or is applicable to any other similar filter of removing the impurity that contains in the air.

Preferred embodiment of the present invention has below been described.Under the premise without departing from the spirit and scope of the present invention, the practitioner in the present technique field will make many modifications.In order to notify the various embodiment of the public can fall within the scope of the present invention, the spy makes following claims.

Claims

1. an air cleaning system, it is used for admitting the inflow air that contains impurity and output to purify air in the flue system of building, and this air cleaning system comprises:

One petticoat pipe, it forms a petticoat pipe outlet that is communicated with flue system;

One primary filter parts, it is installed on the petticoat pipe, is used for admitting flowing into air, therefrom removes at least a portion impurity, and exports a primary air stream; And

A level filter component, it is installed on the petticoat pipe at downstream portion place of primary filter, and therefrom admit primary air stream, secondary filter member has secondary filter media, it operationally removes impurity from primary air stream, and export level air and flow to the petticoat pipe outlet, it is cleaner than primary air stream.

2. air cleaning system as claimed in claim 1 is characterized in that, comprises that also one is connected the duct collar between petticoat pipe outlet and the flue system, be used for admitting secondary airflow from secondary filter, and the guiding secondary air flows to flue system.

3. air cleaning system as claimed in claim 1 is characterized in that, primary filter utilizes the centrifugal filtration principle to operate.

4. air cleaning system as claimed in claim 3 is characterized in that, comprises that also one is arranged on the gatherer at an end place of primary filter, and it operationally admits the impurity of removing from flow into air.

5. air cleaning system as claimed in claim 1 is characterized in that, secondary filter comprises the wall of interior and outer porous, and their formation one fills up the bed of filter media betwixt, and this medium is operationally caught the impurity of removing from primary air stream.

6. air cleaning system as claimed in claim 5 is characterized in that filter media is a porous.

7. air cleaning system as claimed in claim 6 is characterized in that the medium of porous comprises a silica gel.

8. air cleaning system as claimed in claim 5 is characterized in that, secondary filter is operationally collected grease and volatile organic compound.

9. air cleaning system as claimed in claim 5 is characterized in that filter media is non-porous, and forms the gap betwixt, and the size in gap is suitable for storing therein other impurity.

10. air cleaning system as claimed in claim 9 is characterized in that, comprises that also one is arranged on the gatherer at an end place of secondary filter member, and it operationally therefrom admits other particle.

11. air cleaning system as claimed in claim 9 is characterized in that, non-porous medium is selected from such cohort, and it comprises glass and metal.

12. air cleaning system as claimed in claim 5 is characterized in that, comprises that also one surrounds dismountable outer wall of bed.

13. air cleaning system as claimed in claim 2 is characterized in that, also comprises a fan, its operationally extracting air by the primary and secondary filter component, and output duct collar.

14. air cleaning system as claimed in claim 3 is characterized in that, the primary filter parts also comprise:

One elongated air cleaner chamber, it has front, back of closing and the opposite end of closing;

The a pair of inlet that is formed on described air cleaner chamber front, each inlet of described paired inlet are positioned at one of contiguous described air cleaner chamber end and locate; And

One be formed on described chamber back and basically between the opposite end in the middle of the place outlet, wherein, air enters described air cleaner chamber by described inlet, and in a spirality path, longitudinally flow through described air cleaner chamber towards described outlet, wherein, before described air withdrawed from described air cleaner chamber by described outlet, described spirality path caused described airborne impurity to impinge upon on the described air cleaner chamber wall.

15. air cleaning system as claimed in claim 1 is characterized in that, secondary filter member also comprises at least one chamber with a front, be used for admitting leaked-in air, wherein, chamber is formed by the porous wall that fills up filter media, and wherein, porous wall in the past facing epitaxy stretch.

16. an air cleaner chamber comprises:

One roof;

Pair of sidewalls, they extend internally from the outer end of at one end roof, and have far-end at place, an opposite end; And

One front that forms by the far-end of sidewall, structure is admitted the impure air of inflow and is guided air to enter in roof and the sidewall;

Wherein, roof and sidewall are formed by the interior and outer porous member comprising a filter media; And

Wherein, sidewall vertically stretches out from the front.

17. air cleaner chamber as claimed in claim 16 is characterized in that, interior and outer porous member spaced apart distance is less than one inch.

18. air cleaner chamber as claimed in claim 16 is characterized in that, interior and outer porous member spaced apart distance does not allow to produce the pressure drop greater than 2 water columns.

19. air cleaner chamber as claimed in claim 16 is characterized in that filter media comprises a porous materials.

20. air cleaner chamber as claimed in claim 19 is characterized in that filter media comprises a silica gel.

21. air cleaner chamber as claimed in claim 19 is characterized in that filter media comprises a pottery.

22. air cleaner chamber as claimed in claim 16 is characterized in that, filter media comprises a non-porous material.

23. air cleaner chamber as claimed in claim 22 is characterized in that filter media is selected from such cohort, it comprises glass and metal.

24. air cleaner chamber as claimed in claim 16 is characterized in that, also comprises pair of end walls, it is arranged on the far-end of interior and outer porous member, with sealing filter media wherein.

25. air cleaner chamber as claimed in claim 24 is characterized in that at least one end wall is dismountable.

26. remove the method for impurity the air stream in the air cleaning system of the upstream that is arranged on the building flue system, this air cleaning system is the type with a primary filter and a level filter, all steps comprise:

(A) extract inflow air and enter primary filter with air plankton;

(B) from flow into air stream, remove air plankton at the primary filter place, to produce a primary air stream;

(C) primary air stream is outputed to secondary filter;

(D) from primary air stream, remove air plankton at the secondary filter place, to produce a secondary airflow; And

(E) the output secondary air flows in the flue system.

27. method as claimed in claim 26 is characterized in that, step (B) also comprises makes the inflow air stand centrifugal force.

28. method as claimed in claim 26 is characterized in that, step (D) comprises that also the guiding primary air stream enters into the step of the bed that fills up filter media.

29. method as claimed in claim 28 is characterized in that, filter media comprises the pearl of a plurality of porous, and wherein, step (D) also comprises the step that absorbs impurity the primary air stream in entering pearl.

30. method as claimed in claim 29 is characterized in that, the pearl of porous is made by a silica gel.

31. method as claimed in claim 28 is characterized in that, filter media comprises a plurality of non-porous pearls that form the air gap betwixt, and wherein, step (D) also comprises the step that absorption impurity enters the air gap from primary air stream.

32. method as claimed in claim 31 is characterized in that, non-porous pearl is selected from such cohort, and it comprises glass and metal.

A 33. air cleaning system, be used for before air stream is discharged in the building flue system, from air stream, removing the particle that has in the air, this air cleaning system comprises that one forms one and admits the petticoat pipe in the space of the inflow air with impurity, and an outlet that is connected to flue system, a primary filter is installed in the space of petticoat pipe, wherein, primary filter is admitted and is flowed into air, and, remove impurity exporting a filtered air before outlet, its improvement comprises:

One time the level filter is installed in the petticoat pipe, and be arranged in the space at downstream portion place of primary filter, secondary filter is operationally admitted a filtered air from primary filter, and further removes the particle that has in the air, to export twice filtered air towards outlet.

34. air cleaning system as claimed in claim 33 is characterized in that, the primary and secondary filter is mounted obliquely within the petticoat pipe.

35. one makes the method for two-stage air cleaning system, so that operationally admit the air with air plankton and export twice filtered air in the flue system of a building, all steps comprise:

One petticoat pipe is provided, and petticoat pipe forms a petticoat pipe that can be connected to flue system and exports, and wherein, petticoat pipe has first filter mounted thereto, is used for admitting leaked-in air and filtered air of output towards outlet; And

One second filter is installed on the petticoat pipe at downstream portion place of first filter, so that admit filtered air and twice filtered air of output to export towards petticoat pipe.