CN101943444B - Clapboard air conditioner filter - Google Patents

Abstract

The invention discloses a clapboard air conditioner filter, which comprises a ventilating filter port, a frame, folding filter materials and clapboards. The clapboards are arranged in folding cavities of the folding filter materials; the ventilating filter port is at least divided into three filter zones; each filter zone consists of a folding filter material and a clapboard; the filter zone position on the central part is square, and the rest filter zones enclose the filter zone on the central part in turn to form a hollow square area; the filter zones are glued and sealed with one another through glue; and the filter efficiencies of the filter materials selected by the filter zones are decreased gradually in turn from the square filter zone on the central part to the hollow square filter zones enclosing the filter zone on the central part. Besides, the invention discloses a method for dividing filter zones at a ventilating filter port of a bag air conditioner filter. Two technical indexes, namely the filter efficiency and the clogging capacity, and the economical index of running cost are considered, and the characteristic of fluid speed field in a ventilating duct is combined so as to improve the filter efficiency of the air filter.

Description

Iris type Air Conditioning filter

Technical field

The present invention relates to air cleaner, relate more specifically to a kind of iris type Air Conditioning filter of considering rectangle ventilation duct fluid velocity inside field inhomogeneities and designing.

Background technology

The topmost task of indoor air purification is to remove indoor dust granules thing, and effective method is to utilize air cleaner that air is carried out filtration, purification.Filtration is a kind of of isolation technics, mainly is to rely on filtering material to capture to hold back the solid particulate matter that is suspended in the fluid, thereby makes the operation of solid particulate matter and air separation.

The rectangle ventilation shaft is comparatively common in ventilating system, is the important component part of ventilating system.Utilize hydrodynamics knowledge; Can derive the velocity field of rectangle ventilation duct inner fluid, the result finds: speed presents the conic section distribution in the ventilation duct, and promptly speed reaches vertex of a conic at the center of ventilation duct; Along with the increase of decentre distance, speed diminishes gradually.Utilization eddy stress (RSM) with can realize k-ε (Realizablek-ε) model, obtain simulating air flow field result in the square ventilation shaft shown in accompanying drawing 1 and accompanying drawing 2.As can be seen from the figure, fluid velocity diminishes along with the increase of decentre distance gradually, and central area speed is maximum.Because the pulsation of isopleth tangential velocity has caused the generation of cross-current in the isopleth buckled zone, this cross-current points to the corner of pipeline, and the gradient of eddy stress, makes possibly produce Secondary Flow in the square pipe.Secondary Flow has appearred in the flow field of RSM modeling, is more suitable for simulating the air stream flow field in the square ventilation shaft than Realizable k-ε model.This shows that rectangular air duct fluid velocity inside field is more approached shown in Figure 1.

If from participating in airfiltering 3 principal elements promptly: the characteristic of particle, decentralized medium (air) and filtering material considers that the most important parameter that influences the air filting material strainability is: particle diameter, air velocity, fibre diameter and filling rate.Traditional iris type air cleaner is not all considered the inhomogeneities of air velocity degree field in the ventilation duct.Like Fig. 3 is traditional iris type air cleaner; Comprise sealing gasket 1, fluid sealant 2, filtrate 3, demarcation strip 4 and framework 5; The design of filter various piece does not all design by the characteristics of ventilation duct fluid velocity inside field, and the selection of filtrate is not simultaneously distinguished by airduct fluid velocity inside field yet.Because ventilation duct central area wind speed is bigger, this will cause the penetrance of air cleaner central area bigger, and " short slab " that become filter directly influenced the filter efficiency of air cleaner.Therefore, exist technically to require simplicity of design, make and can combine the iris type air conditioner filter of the characteristics of ventilation duct fluid velocity inside field distribution easily, thereby improve the filter efficiency of iris type air conditioner filter better, strengthen its service life.

Summary of the invention

The purpose of this invention is to provide a kind of simple iris type Air Conditioning filter; This clapboard type filter made overall plans filter clogging effect, two technical indicators of dust containing capacity; And the economic indicator of operating cost; And combine the characteristics of ventilation duct fluid velocity inside field distribution, under the good situation of dust containing capacity and operating cost, improved the filter efficiency of air cleaner.

In order to realize the object of the invention, iris type Air Conditioning filter of the present invention comprising ventilate filtration mouth, frame, collapsible filtrate and dividing plate; In the folded cavity of collapsible filtrate, be provided with dividing plate; Described ventilation is filtered mouth and is divided into three filtering areas at least, and each filtering area is formed by collapsible filtrate and dividing plate, wherein; The filtering area that is positioned at the centre is a hollow, and remaining filtering area is centered around the centre filtering area successively and forms Back Word type zone.Pass through the mutual adhesive seal of viscose glue between said each filtering area.Its filter efficiency of filtrate that each filtering area is selected is successively decreased to the three-back-shaped filtering area direction that is centered around the centre filtering area by the hollow filtering area in centre successively.

The partition method of mouthful filtering area is filtered in the ventilation of described pocket type Air Conditioning filter, it is characterized in that comprising the steps:

Step 1: division number and the size of confirming filtering area: air quantity and size utilization SIMPLE algorithm computation according to mounting filtering device rectangular duct simulate the velocity field on the airduct section; Close velocity field is divided into same filtering area; And according to the definite size of respectively dividing number and each filtering area of filtering area of the size of velocity field; Wherein, the filtering area that is positioned at the centre is a hollow, and remaining filtering area is centered around the centre filtering area successively and forms Back Word type zone; The rate of filtration of confirming when each filtering area and the sum of products of each district's area should with the difference of the air quantity of setting less than 5% the time; Think that the zoning result is effective, otherwise need the repetition above-mentioned steps until the sum of products of the rate of filtration that each filtering area is confirmed and each district's area should with the difference of the air quantity of setting less than 5% o'clock till.

Step 2: select filtrate: filter efficiency and working environment according to filter are selected the filtering area filtrate, and its filter efficiency of the filtrate of selection is successively decreased to the three-back-shaped filtering area direction that is centered around the centre filtering area by the hollow filtering area in centre successively.

Step 3: the thickness of confirming each filtering area filtrate: the thickness that calculates each filtering area filtrate according to the filter clogging effect behind the zoning, dust containing capacity and operating cost.

The present invention will be ventilated through rationalization partition and filtered mouth and be divided into a plurality of zones as requested; Air to flowing through it filters; Effectively removed the airborne particulate pollutant that flows through airduct; Reach the purpose that purifies air, can effectively reduce operation and maintenance cost that ventilation duct filters simultaneously.

Description of drawings

Fig. 1 is the speed field pattern that the RSM model is simulated the rectangular air duct air;

Fig. 2 is the speed field pattern that can realize that Realizable k-ε model is simulated the rectangular air duct air;

Fig. 3 is a conventional baffle formula filter structure schematic representation;

Fig. 4 is a structural representation of the present invention;

Fig. 5 is that collapsible filtrate of the present invention is vertically placed the filtration sketch map;

Fig. 6 is a collapsible filtrate horizontal positioned filtration sketch map of the present invention;

Fig. 7 is that the collapsible filtrate of the present invention is vertically placed with horizontal positioned and intersected the Back Word type filtering area sketch map of composition.

Fig. 8 is middle effect filtering material resistance and the tendency chart that concerns of considering speed.

Fig. 9 is the employed instrument annexation of a subregion filter model experimental implementation sketch map.Wherein 91 is temperature, humidity measurement hole, and 92 is granular mass concentration particle diameter distribution tests hole, and 93 is the wind speed instrument connection, and 94 is filter material layer, and 95 is homogenizing plate, and 96 is blower fan, and 97 is speed-regulating switch, and 98 is AC/DC changeover switch.

Figure 10 is the comparative experiments sketch map as a result that adopts effect that technical scheme that subregion filters filters at the particle below 10 microns (PM10) particle diameter and conventional filter filter effect.

Figure 11 is the comparative experiments sketch map as a result that adopts effect that technical scheme that subregion filters filters at the particle below 4 microns (PM4.0) particle diameter and conventional filter filter effect.

Figure 12 is the comparative experiments sketch map as a result that adopts effect that technical scheme that subregion filters filters at the particle below 1 micron (PM1.0) particle diameter and conventional filter filter effect.

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are done explanation in further detail, but the present invention is not limited to these embodiment.On the contrary, the present invention is intended to cover all conversion scheme, remodeling and the coordinate that comprises in the spirit and scope of the present invention that are limited by the accompanying claims.

The specific embodiment

Referring to Fig. 4-Fig. 7, iris type Air Conditioning filter of the present invention, comprising ventilates filters mouth, frame 4, collapsible filtrate 5 and dividing plate 6; In the folded cavity of collapsible filtrate 5, be provided with dividing plate 6; Described ventilation is filtered mouth and is divided into three filtering areas at least, and each filtering area is formed by collapsible filtrate 5 and dividing plate 6, wherein; The filtering area 1 that is positioned at the centre is hollow, and remaining filtering area (2,3) is centered around centre filtering area 1 successively and forms Back Word type zone.Make it into as a whole through the mutual adhesive seal of viscose glue between said each filtering area; Collapsible filtrate 5 its filter efficiencies that each filtering area is selected are successively decreased to the three-back-shaped filtering area direction that is centered around the centre filtering area by the hollow filtering area in centre successively.

The partition method of mouthful filtering area is filtered in the ventilation of iris type Air Conditioning filter of the present invention, comprises the steps:

Step 1: division number and the size of confirming filtering area.Because the rate of filtration can produce very big influence to the filter efficiency and the resistance of filtrate, find with middle effect filtrate to be example through summing up us, middle effect filtering material resistance and the rapid-result positive correlation of worry are referring to shown in Figure 8.Therefore we can simulate the velocity field on the airduct section according to the air quantity and the size utilization SIMPLE algorithm computation in mounting filtering organ pipe road; Close velocity field is divided into same filtering area; And according to the definite size of respectively dividing number and each filtering area of filtering area of the size of velocity field; The filtering area 1 that is positioned at the centre is quadrangle; Remaining filtering area (2,3) is centered around the centre filtering area successively and forms ring-type; The rate of filtration of confirming when each filtering area and the sum of products of each district's area should with the difference of the air quantity of setting less than 5% the time, think that the zoning result is effective, otherwise need the repetition above-mentioned steps until the rate of filtration that each filtering area is confirmed and each distinguish area the sum of products should with the difference of the air quantity of setting less than 5% o'clock till.Recommend the wind speed method to design because the air conditioner airduct adopts, therefore under the situation of same size airduct, can make the not filter of model of the same race according to the different utilization of selected wind speed said method.Need to prove that this step utilization SIMPLE algorithm carries out numerical computations; This method be mainly used in find the solution can not the baric flow field numerical method (but also can be used for finding the solution baric flow moving); Its core is to adopt the process of " conjecture-correction "; The calculating pressure field of coming up on the basis of staggered-mesh, thus reach the purpose of finding the solution the equation of momentum (Navier-Stokes equation).Use the basic ideas of SIMPLE algorithm following in the present invention: for given pressure field (it can be the value of supposition, or the resulting result of last iterative computation), to find the solution the equation of momentum of discrete form, draw velocity field.Used equation is following:

Wherein: U: medium inlet velocity, m/s; C _μ, C ₁, C ₂,

,

: model constants, like table 1;

K: turbulent fluctuation kinetic energy, m ²/ s ²; v _t: kinematic coefficient of viscosity, m ²/ s.

Table 1 model constants

Step 2: select filtrate.According to the filter efficiency and the working environment comprehensive selection filtrate of filter, its filter efficiency of the filtrate of selection is successively decreased to the ring-type filtering area that is centered around the centre filtering area (2,3,4,5) direction by the filtering area (1) in centre successively; For example select filtering material grammes per square metre 66.3,70.5,150.0,200.0g/m ², fibre diameter can be selected multiple filtrates such as 14.3,16.3,19.5,22.5 microns.Can select the filtrate type to comprise in the present invention: acetate fiber, glass fibre, chlorination vinylon, polyamide, polypropylene, polyester, vinylon, propylene etc.; And make the series of products of different model according to different filter effects, to satisfy user's demand.

Step 3: the thickness of confirming filtrate.Calculate the thickness of filtrate according to the filter clogging effect behind the zoning, dust containing capacity and operating cost.Confirm best filtrate thickness according to the efficient of filter resistance and filter, minimum to realize air cleaner whole life expense.Because after filtrate was selected, fibre diameter and filling rate all were definite value, thus mainly be the thickness of confirming filter leaching material, easy for installation in order to make in actual motion, so each filtering area adopts identical filtration layer thickness H.Supposing at first that each filtering area fiber is all well-regulated is arranged on the vertical direction of air-flow, and each layer fiber has identical probability to the capture of particle, and particle is evenly distributed in the air-flow.So the filter efficiency of each subregion can adopt following formula to calculate:

$\mathrm{\η}=1-\exp [-\frac{4\mathrm{\α}{\mathrm{H\η}}_{\mathrm{\Σ}}}{(1-\mathrm{\α})\mathrm{\π}{d}_f}],$

Wherein:

${\mathrm{\η}}_{\mathrm{\Σ}}=-1.8\frac{(1-\mathrm{\α})d_f\lg K^{\′}}{\mathrm{H\α}}$

η _∑---the capture gross efficiency of single fiber on unit length

H---filter course thickness, m

μ---the gas coefficient of viscosity, Pas

V---filtering velocity m/s

d _f---the diameter of single fiber

Simultaneously, total filter efficiency of filter can adopt following formula to calculate:

${\mathrm{\η}}_Z=\frac{A_1}{A}\·{\mathrm{\η}}_1+\frac{A_2}{A}\·{\mathrm{\η}}_2+......+\frac{A_n}{A}\·{\mathrm{\η}}_n$

Wherein: A ₁---the area of first filtering area; A ₂---the area of second filtering area; A _nThe area of n filtering area; A---the filter area that filter is total; η ₁---the filter efficiency of first filtering area; η ₂---the filter efficiency of second filtering area; η _n---the filter efficiency of n filtering area; η _Z---total filter efficiency of filter.

In addition, each subregion resistance can adopt following formula to calculate:

Wherein: H-filter course thickness, m; μ-gas the coefficient of viscosity; V-filtering velocity m/s; Filling rate

d _f---the diameter of single fiber;

${\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="HDA0000023919220000041.png"\; state="\{\{state\}\}">m</figure-callout>}}_2=1.6d_f^{-0.05}$

It below is

value of the fiber of routine: acetate fiber 0.3～0.52; Glass fibre 1.0, chlorination vinylon 0.61, polyamide 1.0; Polypropylene 1.0; Polyester 1.0, vinylon 0.4, propylene 1.0.

After filtrate was selected, having only the layer thickness H of filtration in the above-mentioned formula was unknown number.Because each subregion belongs to the parallel connection relation, so filter drag overall Δ P _ZCan calculate by following formula:

$\frac{1}{\mathrm{\&Delta;}{P}_Z}=\frac{1}{\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA0000023919220000011.png,HDA0000023919220000031.png"\; state="\{\{state\}\}">P</figure-callout>}}_1}+\frac{1}{\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="HDA0000023919220000041.png"\; state="\{\{state\}\}">P</figure-callout>}}_2}+......+\frac{1}{\mathrm{\&Delta;}{P}_n}$

Wherein: Δ P ₁---the first subregion resistance; Δ P ₂---the second subregion resistance; Δ P _n---n subregion resistance; Δ P _Z---the filter drag overall.

The filter operation energy consumption can be calculated by following formula:

wherein: E=energy consumption [degree/year] q---air quantity [m3/s]; Δ P---resistance [Pa]; T---running time [hour/year]; E---fan operation efficient;

And the life-span of filter can be calculated by following formula:

${\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000023919220000011.png,HDA0000023919220000021.png"\; state="\{\{state\}\}">T</figure-callout>}}_0=\frac{P_0}{N\&times;{10}^{-3}\mathrm{Qt}{\mathrm{\&eta;}}_Z}$

Wherein: P ₀---filter criteria laying dust amount, g; T ₀---service life, day; Dust content before N---the filter, mg/m ³One running time of t---filter, h; η _Z---filter clogging effect

Price and the renewal cost of supposing each filter are a unit, and every degree electricity price lattice are b unit, so filter Life cycle operating cost can calculate with following formula: Because can Jiang Ge district area A according to step 1 _nAnd respectively distinguish rate of filtration Vn and confirm, and other filter parameter are definite value after filtrate is selected, be variable so have only the layer thickness H of filtration, ask extreme value can obtain under this operating mode to object function Z=F (H), this kind media filtration layer optimum thickness.

Following applicant adopt technical scheme of the present invention respectively to particle diameter at particle below 10 microns (PM10.0), particle diameter is experimentized at the particle below 1 micron (PM1.0) at the particle below 4 microns (PM4.0), particle diameter, and it is compared with the filter effect of traditional filter respectively.Hot-wire anemometer and atmospheric dust detector that the experimental implementation instrument that the present invention adopted is produced for U.S. Technical Sourcing Internation, the connection side of each instrument concerns with reference to accompanying drawing 9, wherein on airduct, has four instrument connections; Two holes 92 are granular mass concentration particle diameter distribution tests hole; Be used for test dust concentration, instrument connection 93 is used for testing wind speed, and instrument connection 91 is used for testing humiture; Be provided with homogenizing plate 95 in the back of blower fan; Purpose is to make even flow field before the filter, and blower fan 96 is connected with speed-regulating control device 97 with power supply, and purpose is to change fan delivery.

Embodiment 1; Selecting diameter is the ventilation shaft of 100 * 100mm; The wind speed of given 0.80.8m/s or air quantity utilize the SIMPLE algorithm computation to simulate the velocity field on the airduct section, and velocity field such as Fig. 1 on the airduct section are said; Can the ventilation duct road junction be divided into 3 filtering areas through diagram, the sum of products of the rate of filtration that this moment, each filtering area was confirmed and each district's area should with the difference of the air quantity of setting less than 5%.Each filtering area is formed by collapsible filtrate 5 and dividing plate 6, and the filtering area 1 that is positioned at the centre is hollow, and remaining filtering area (2,3) is centered around centre filtering area 1 successively and forms Back Word type zone.Make it into as a whole through the mutual adhesive seal of viscose glue between each filtering area.The zone of the filtering area in centre is selected for use and is adopted individual layer grammes per square metre 200g/m ²Fibre diameter be 14.3 microns terylene as filtrate, remaining filtering area (2,3) is selected identical grammes per square metre 200g/m successively for use ²But fibre diameter is respectively 16.3,19.5 microns terylene as filtrate.

Fig. 9-Figure 11 experimentizes at the particle below 1 micron (PM1.0) at particle below 10 microns (PM10.0), the particle (PM4.0) below 4 microns, particle diameter to particle diameter; As can be seen from the figure; The filter that uses this method is for the filter of traditional idea design; The filter efficiency that pellet PM10.0 still is prone to be deposited on the inner PM1.0 of alveolar all is improved significantly, and the gained conclusion is consistent under the different facial wind speed.

By above-mentioned visible, air cleaner provided by the invention filters the air that flows through it through five filtering areas, has effectively removed the airborne particulate pollutant that flows through airduct, has reached the purpose that purifies air.

Certainly, according to technical scheme of the present invention, can also the ventilation duct road junction be divided into the filtering area on 3, and can reach technique effect described in the invention equally.

Claims (2)

1. iris type Air Conditioning filter; Comprising ventilates filters mouth, frame (4), collapsible filtrate (5) and dividing plate (6); In the folded cavity of collapsible filtrate (5), be provided with dividing plate (6); It is characterized in that: described ventilation is filtered mouth and is divided into three filtering areas at least, and each filtering area is formed by collapsible filtrate (5) and dividing plate (6), wherein; The filtering area (1) that is positioned at the centre is a hollow, and remaining filtering area (2,3) is centered around centre filtering area (1) successively and forms Back Word type zone; Pass through the mutual adhesive seal of viscose glue between each filtering area; Its filter efficiency of collapsible filtrate (5) that each filtering area is selected is successively decreased to the three-back-shaped filtering area direction that is centered around the centre filtering area by the hollow filtering area in centre successively.

2. the partition method of mouthful filtering area is filtered in the ventilation of the described iris type Air Conditioning of claim 1 filter, it is characterized in that comprising the steps:

Step 1: division number and the size of confirming filtering area: air quantity and size utilization SIMPLE algorithm computation according to mounting filtering device rectangular duct simulate the velocity field on the airduct section; Close velocity field is divided into same filtering area; And according to the definite size of respectively dividing number and each filtering area of filtering area of the size of velocity field; Wherein, The filtering area (1) that is positioned at the centre is a hollow, and remaining filtering area (2,3) is centered around centre filtering area (1) successively and forms Back Word type zone; The rate of filtration of confirming when each filtering area and the sum of products of each district's area should with the difference of the air quantity of setting less than 5% the time; Think that the zoning result is effective, otherwise need the repetition above-mentioned steps until the sum of products of the rate of filtration that each filtering area is confirmed and each district's area should with the difference of the air quantity of setting less than 5% o'clock till;

Step 2: select filtrate: filter efficiency and working environment according to filter are selected the filtering area filtrate, and its filter efficiency of the filtrate of selection is successively decreased to the three-back-shaped filtering area direction that is centered around the centre filtering area by the hollow filtering area in centre successively;

Step 3: the thickness of confirming each filtering area filtrate: the thickness that calculates each filtering area filtrate according to the filter clogging effect behind the zoning, dust containing capacity and operating cost.

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