KR100769285B1 - Multiple automatic air cleaner - Google Patents

Abstract

An air filtering device is provided to make an air current equally penetrate through the front side of an air filtering unit and to clean an electric dust collecting unit equally and repeatedly by plural water cleaning lines. An air filtering device is composed of a plasma discharge unit(30) which is installed adjacently to at least one inflow port(13) of a duct(10), applies an electric charge by applying high voltage and decomposes gaseous pollutants by using corona pulse discharge; an electric dust collecting unit(40) installed at the rear side of the plasma discharge unit to collect the charged dust; a water cleaning unit formed at the lower side of the electric dust collecting unit to clean the collected dust; an ultraviolet photocatalyst unit(50) formed at the rear side of the electric dust collecting unit to remove the gaseous pollutants by oxidation; and a turbulence preventing net(15) provided with plural holes and installed between at least one inflow port of the duct and the plasma discharge unit to prevent turbulence generated when air currents flowing from at least one inflow port of the duct interfere with each other.

Description

Compound air filtration device {MULTIPLE AUTOMATIC AIR CLEANER}

1 is a perspective view of a composite air filtration device according to an embodiment of the present invention

2 is a plan view of a composite air filtration device according to an embodiment of the present invention

Figure 3 is a front view of the electrostatic precipitator of the composite air filtration according to an embodiment of the present invention

4 is a detailed view of a washing unit included in the electrostatic precipitator of FIG.

5 is a state diagram of the photochemical reaction generated by the photocatalyst in the composite air filtration apparatus according to an embodiment of the present invention

6 is a state diagram for decomposing / removing toluene in the composite air filtration apparatus according to an embodiment of the present invention.

7 is a graph showing the dust collection efficiency according to the particle diameter of the particulate contaminants by the composite air filtration apparatus according to an embodiment of the present invention

* Explanation of symbols for the main parts of the drawings

10 duct 13 inlet

15: vortex prevention net 20: pretreatment filter

30: plasma discharge unit 40: electric dust collector

43: dust collection cell 45: water washing line

47: spray nozzle 49: washing water discharge portion 50: ultraviolet photocatalyst portion 51: mesh plate

53: UV Lamp 55: Driving Motor

57: washing water supply pump

The present invention relates to a composite air filtration device, and more particularly, to a composite air filtration device in which the overall air filtration efficiency is improved, and the electric dust collecting part is uniformly overlapped and cleaned by the plurality of water washing lines.

In order to create comfortable indoor air in living spaces and to protect human health, the installation of air filtration devices is continuously increasing. In recent years, it has become almost essential to provide not only an air conditioning function but also an air purifying function to an air conditioner installed in a building or an underground facility. However, in general, polluted dusts in human living spaces are distributed in various sizes ranging from submicron units to tens of microns, and have very different chemical or microbiological characteristics. Therefore, depending on the chemical or microbiological characteristics of these polluted dusts, the harmful effects of the polluted dusts on the human body also vary.

Accordingly, the air filtration device must be able to remove not only the filtration by a prefibrous pretreatment filter but also an electrostatic precipitating method and gaseous or microbial contaminants.

To this end, for example, Korean Patent Laid-Open Publication No. 10-2000-59884 (published on October 16, 2000) discloses a duct in which an inlet and an outlet are formed at its front and rear portions, respectively, in a duct adjacent to the inlet. A pre-treatment filter disposed in the first inlet and filtering the contaminants introduced through the inlet, a plasma discharge unit disposed at a rear of the pretreatment filter to impart charge to particulate matter passing through the pretreatment filter and decompose gaseous contaminants, and the plasma Disclosed is an air filtration apparatus including an electrostatic precipitator disposed behind a discharge unit to collect charged dust, and an ultraviolet photocatalyst unit disposed behind the electrostatic precipitator to oxidize and remove gaseous contaminants.

Such an air filtration device has an effect of efficiently removing particulate matter and improving the decomposition efficiency of gaseous contaminants by the interaction of an electrostatic precipitator, an ultraviolet photocatalyst, and a pulsed corona plasma.

In practice, however, when installing an air filtration device in a building or an underground facility, in many cases, two or more inlets must be formed in different directions at the front of the duct due to the structure of the ventilation holes or other reasons. When the inlets are formed in different directions as described above, vortices are generated in the duct by interfering with the airflows introduced at the same time at high pressure in each of the inlets, thereby proceeding to only one part of the filter element including the pretreatment filter. . Therefore, not only an overload is applied to the corresponding portion of the pretreatment filter or the like which reaches the vortex, but also affects the next stage air filtration unit, the plasma discharge unit, the electrostatic precipitating unit, and the ultraviolet photocatalyst unit, and eventually the overall air of the air filtration device. There is a problem that leads to a decrease in filtration efficiency. This problem occurs not only when two or more yugu are formed, but also when a vortex occurs due to structural problems of various inflow paths even when one inlet is formed.

In addition, in order to remove contaminants that are concentrated on only one portion of the pretreatment filter by vortex, the pretreatment filter has to be replaced or the contaminants have to be washed and removed frequently. Therefore, maintenance of the pretreatment filter is cumbersome and additional maintenance costs are required. As a result, there is a problem that the operation rate of the air filtration device is lowered.

In addition, the conventional air filtration apparatus is provided with a single water washing line formed at regular intervals in order to clean the electric dust collecting unit, the spray nozzle for spraying the washing water down to a high pressure. However, when one water cleaning line having spray nozzles is formed at regular intervals, a non-cleaning gap is generated in the middle portion between the nozzles of the water cleaning line, so that the electric dust collecting part to be cleaned can be uniformly cleaned as a whole. There is no problem.

That is, if the washing water spray angle of each spray nozzle of the water washing line is reduced, an uncleaning gap of the electric dust collecting part which does not reach the washing water sprayed from the nozzles is generated, and conversely, to clean a large area, When the washing water spray angle of the spray nozzle is increased, the washing water sprayed from the nozzles collide with each other and cause interference with the cleaning dust.

As described above, when the non-cleaning voids are generated in the electric dust collector and are not uniformly cleaned, the dust collection efficiency of the electric dust collector is lowered, which leads to a decrease in the air filtration efficiency of the air filtration device.

Accordingly, an object of the present invention is to uniformly distribute the airflow flowing into the duct by the vortex prevention net to uniformly penetrate the front surface of the air filtering unit of the next stage, and the electric dust collector is uniformly overlapped by the plurality of water washing lines. To provide a compound air filtration device to be cleaned.

In order to achieve the above object of the present invention, in one embodiment of the present invention, the plasma discharge portion is formed adjacent to one or more inlets of the duct to decompose gaseous contaminants, to remove the dust of the discharge portion for efficiency improvement A handmade part, an electric dust collecting part formed at the rear of the plasma discharge part to collect charged dust, a water washing part formed at the lower part of the electric dust collecting part to wash the collected dust, and a gaseous contaminant formed at the rear of the electric dust collecting part. In the air filtration device including an ultraviolet photocatalyst for oxidizing and removing the water, a plurality of holes are formed between the inlet of the duct and the pretreatment filter to prevent vortices from interfering with each other. A combined air filtration device is provided that includes a vortex barrier.

In the composite air filtration apparatus according to the present invention, the air flow flowing into the duct is uniformly distributed by the vortex prevention net, and uniformly penetrates the entire surface of the pretreatment filter and the air filtration unit of the next stage, thereby improving the overall air filtration efficiency, and pretreatment The filter replacement or cleaning cycle is extended, and the water cleaning device of the discharge part maintains high discharge efficiency, and the electric dust collecting part is uniformly cleaned by the plurality of water cleaning lines to improve cleanliness.

An embodiment of the composite air filtration device of the present invention will be described in detail with reference to the drawings.

1 is a schematic view of a composite air filtration device according to an embodiment of the present invention, Figure 2 shows a plane of the composite air filtration device according to an embodiment of the present invention.

1 and 2, the composite air filtration device according to an embodiment of the present invention is a vortex prevention net 15 formed between one or more inlet 13 of the duct 10 and the plasma discharge unit 30 ) Is included. In this case, a pretreatment filter 20 may be further formed between the inlet 13 and the plasma discharge unit 30 to filter particles of relatively large particles.

First, at least one inlet (shown in FIG. 1 and FIG. 2 having two inlets formed) formed in different directions at the front thereof so that air containing particulate dust or gaseous contaminants is introduced therein. (13) and a duct 10 including an exhaust port formed in the rear portion so that the air introduced from the inlet 13 is filtered out of the air filtration unit including the plasma discharge unit 30.

A vortex flow prevention net having a plurality of holes formed between the inlet 13 and the plasma discharge part 30 at a position adjacent to two inlets 13 formed in different directions of the front portion of the duct 10 ( 15 is located (when the pretreatment filter 20 is further formed at the inlet 13 and the plasma discharge unit 30, the vortex barrier 15 is disposed between the inlet 13 and the pretreatment filter 20. The same below).

As described above, the vortex prevention net 15 formed adjacent to the two inlets 13 prevents the generation of vortices due to the interference of the air streams simultaneously introduced from the respective inlets 13, thereby uniformly dispersing the air streams, thereby In addition to the pre-treatment filter 20, it is possible to uniformly transmit the entire surface of the plasma discharge unit 30, the electric dust collecting unit 40, and the ultraviolet photocatalyst unit 50, which are air filtering units of the next stage.

The vortex barrier net 15 is configured using a metal material excellent in mechanical properties. However, since the vortex prevention net 15 is formed adjacent to the inlet 13 of the duct 10 of the composite air filtration device, the air containing particulate or gaseous contaminants introduced into the duct 10 is first vortexed. It comes into contact with the guard net 15. Therefore, the use of the vortex barrier net 15, which is formed by plating zinc with excellent pollution resistance and durability against gaseous contaminants in a metal mesh including a wire mesh, can prevent corrosion of the vortex barrier net 15 and extend its life. It is preferable in that it is.

As described above, the vortex flow prevention net 15 provided between the inflow 13 and the pretreatment filter 20 is configured to have an opening ratio of 55 to 65%.

If the opening ratio of the vortex barrier net 15 is less than 55%, the pressure loss of the airflow passing through the vortex barrier net 15 is increased, and if the opening ratio of the vortex barrier net 15 exceeds 65%, it passes through the vortex barrier net 15 The vortex prevention effect with respect to the airflow to make falls.

In addition, the hole of the vortex barrier net 15 may have a variety of forms. At this time, if the hole is circular, the diameter is preferably 3 to 15 mm.

If the diameter of the hole formed in the vortex prevention net 15 is less than 3 mm while satisfying the opening ratio condition of the vortex prevention net 15, a very large number of holes must be formed per unit area, and the workability is reduced, and the vortex prevention net ( If the diameter of the hole of 15) exceeds 15 mm, the result is that only a few large sized holes are formed as a result, and the effect of preventing the vortex against the airflow passing through the vortex barrier net 15 is lowered.

By the vortex prevention net 15 having an aperture ratio of 55 to 65% and the hole having a diameter of 3 to 15 mm, the generation of vortices due to the interference of airflows simultaneously introduced from one or more inlets 1 is prevented. The air flow proceeds to the pretreatment filter 20 in the form of a laminar flow generated by uniformly dispersed. As a result, the overall air filtration efficiency is improved, and the period for replacing or cleaning the pretreatment filter 20 is extended.

Optionally, a pretreatment filter 20 is formed facing the rear of the vortex barrier net 15 to filter firstly the contaminants contained in the airflow flowing in from the inlet 13. The pretreatment filter 20 is configured to primarily remove dust having a large particle diameter, thereby preventing overloading in the next stage of the air filtration unit.

The plasma discharge part 30 is formed to face the rear of the pretreatment filter 20 to decompose gaseous contaminants. The plasma discharge unit 30 is configured to impart charge to particulate matter having a relatively small particle size passing through the pretreatment filter 20, and decompose gaseous contaminants using pulse corona discharge.

An electric dust collecting part 40 is formed to collect charged particulate dust facing the rear of the plasma discharge part 30. The electrostatic precipitator 40 is configured to collect and clean the particulate dust charged in the plasma discharge unit 30.

Specifically, the electrostatic precipitator 40 is composed of a plurality of dust collecting cells 43 for collecting charged particulate dust. Each dust collecting cell 43 is composed of a ground mesh made of an aluminum mesh, a plurality of collecting electrodes formed inside the ground mesh, a plurality of discharge electrodes arranged between the collecting electrodes, and an insulating coating body surrounding the discharge electrodes. do.

The dust collecting cell 43 which collects charged particulate dust is composed of a thickness of 10 to 100 mm. In general, when the thickness of the dust collecting cell 43 is increased, the dust collecting efficiency is increased. If the thickness of the dust collecting cell 43 is less than 10 mm, the dust collecting efficiency of the charged particulate dust is lowered, and if the thickness of the dust collecting cell 43 exceeds 100 mm, the volume of the electric dust collecting part 40 becomes too large, resulting in construction problems. Is generated and excessive power is required to operate the electric dust collector 40.

These dust collecting cells 43 are continuously connected, and configured to circulate in a support frame disposed inside the duct. That is, an upper sprocket and a lower sprocket are formed at upper and lower ends of the support frame, respectively, and the lower sprocket is connected to a driving motor 55 that provides rotational force. In addition, a pair of chains moving along the upper sprocket and the lower sprocket are respectively connected between the upper sprocket and the lower sprocket, and a plurality of dust collecting cells 43 are connected to the pair of chains in turn, so that the chain The electric dust collecting part 40 is infinitely rotated along the configuration.

In one embodiment of the present invention includes a washing unit for cleaning the dust collecting cell 43 that rotates indefinitely in the electric dust collector (40).

A plurality of water cleaning lines are formed in the inner lower portion of the electric dust collector. For example, two flush lines may be formed, a first flush line and a second flush line. The flushing unit in which the jetting nozzles of the first flushing line and the jetting nozzles of the second flushing line are alternately arranged will be described in detail with reference to the drawings.

3 is a front view of the electrostatic precipitator of the composite air filtration according to an embodiment of the present invention, and FIG. 4 is a detailed view of the washing part included in the electrostatic precipitator of FIG. 3.

3 and 4, the composite air filtration device according to an embodiment of the present invention includes a washing unit for washing the dust collected by the electric dust collector 40 by washing water spray. The water washing unit is configured such that two rows of water washing lines 45 connected to the washing water supply pump 57 are formed, and the spray nozzles 47 of the respective water washing lines 45 are alternately arranged.

Specifically, the first water washing line 45 and the second water washing line 45 spraying the washing water at a high pressure from the inner lower portion of the electric dust collecting part 40 toward the dust collecting cell 43 of the lower part of the electric dust collecting part 40 ( 45) The flushing governments are arranged so that they are arranged horizontally and parallel to each other. Although the height of the first flush line 45 and the second flush line 45 may be different from each other to form a flush unit, the first flush line 45 and the second flush line 45 may be formed. By arranging the heights of the same, constituting the water washing unit maintains the same washing effect by the washing water sprayed from the first water washing line 45 and the washing water spraying from the second water washing line 45. Can be.

The first and second flush lines 45 of the flushing unit are respectively formed with spray nozzles 47 at regular intervals. In order to spray the washing water evenly to the dust collecting cells 43, the first flush line The first water washing line 45 and the second water washing line 45 such that the injection nozzles 47 of the injection nozzles 45 and the injection nozzles 45 of the second water washing line 45 are alternately arranged. ) Is configured.

Specifically, nozzle 1 of the first water washing line, nozzle 1 of the second water washing line, nozzle 2 of the first water washing line, nozzle 2 of the second water washing line, 3 of the first water washing line No. 1 nozzle, No. 3 nozzle of the second flush line, No. 4 nozzle of the first flush line, No. 4 nozzle of the second flush line and the like are arranged in a zigzag pattern in order to be cleaned. 43) may have the effect of being washed twice while moving.

The dust collecting cell 43 is formed by the spray nozzles 47 of the first water washing line 45 and the washing water sprayed from the spray nozzles 47 of the second water washing line 45 which are alternately arranged as described above. This is washed uniformly as a whole. That is, the dust collecting cell 43 of the electric dust collecting part 40 is first washed by the first water washing line 45, and the non-cleaning non-cleaning space which is not cleaned by the first washed dust collecting cell 43 is the second. Secondary cleaning by the water washing line 45, the dust collecting cell 43 is uniformly cleaned as a whole.

In addition, most of the regions excluding the non-cleanable voids of the dust collecting cell 43 are cleaned by overlapping the first water washing line 45 and the second water washing line 45, thereby making the cleanliness of the dust collecting cell 43 clean. Is improved.

The water washing unit for washing the dust collecting cells 43 is formed on the lower part of the washing water supply pump 57 and the electric dust collecting unit 40 to supply the washing water at high pressure to the first and second washing lines 45. A washing water discharge part 49 for discharging the washing water injected from the first and second water washing lines 45 to the outside is included.

The ultraviolet photocatalyst 50 is formed to face the electric dust collector 40 and the back of the water washing unit to oxidize and remove gaseous contaminants. The ultraviolet photocatalyst 50 is spaced at a predetermined distance, and a pair of mesh plates 51 coated with titanium oxide, and an ultraviolet lamp 53 formed between the pair of mesh plates 51 are provided. Included. Ultraviolet light emitted by the ultraviolet lamp 53 and ultraviolet light emitted by pulsed plasma discharge are simultaneously propagated to the titanium oxide-coated mesh plate 51 to improve photocatalyst efficiency, thereby oxidizing and removing gaseous contaminants.

The operation of the compound air filtration device as described above will be described in detail with reference to the accompanying drawings.

Air containing particulate dust or gaseous contaminants is introduced at two inlets formed in different directions of the duct of the compound air filtration device. As the airflow introduced into the duct passes through the vortex prevention network, the generation of vortices due to the interference of the airflow is prevented, and the laminar flow generated by being uniformly distributed proceeds to the pretreatment filter.

Contaminants contained in the air stream uniformly dispersed in the vortex flow prevention net are first filtered in a pretreatment filter. The large particle size contained in the air stream is first removed from the pretreatment filter, so that the next stage of the air filtration unit is not overloaded.

The air stream from which the contaminants are first filtered and removed from the pretreatment filter is applied with a high voltage while passing through the plasma discharge unit, and charge is applied to the particulate dust contained in the air stream, and gaseous contaminants are decomposed.

The charged particulate dust is collected in the electrostatic precipitator, and the collected dust is washed by the water washing unit. Subsequently, the dust collecting cell is first washed by the first washing line of the water washing unit, and the non-cleaning non-cleaning voids not yet cleaned by the first washing dust collecting cell are secondly washed by the second washing line, thereby causing the scroll to be washed. The type dust collecting cell is cleaned uniformly throughout. In addition, since most of the regions excluding the non-cleanable blanks of the dust collecting cells are washed by the first water washing line and the second water washing line, the cleanliness of the scroll type dust collecting cell is improved.

On the other hand, gaseous contaminants not decomposed and removed by the plasma discharge unit and the electrostatic precipitating unit are oxidized and removed by the photocatalyst unit to effectively remove particulate matter as well as gaseous contaminants.

Figure 5 shows the state of the photochemical reaction generated by the photocatalyst in the composite air filtration apparatus according to an embodiment of the present invention.

Referring to FIG. 5, first, when ultraviolet light is projected onto a surface of a titanium oxide mesh plate having an anatase phase, at least 3.2 eV, which is a bandcap energy of titanium oxide, electrons e- _CB and holes may be used. hole h + _VB is generated. They react with water or oxygen molecules in air as follows to produce the active radicals OH ^* .

_{O 2 + 2H 2 O + 4e-} CB → 4OH -

_{^{4OH - + 4h + VB → 4OH}} *

Since the OH ^* radicals generated at this time are more oxidative than the oxidative power of general molecular reactions, the volatile organic substances and pollutants contained in the polluted gas are oxidized and stabilized.

As an example, the removal of toluene, which is a representative volatile organic substance of indoor air pollution, will be described in detail with reference to FIG. 6.

6 illustrates a state of decomposing / removing toluene contained in air in the composite air filtration apparatus according to an embodiment of the present invention.

Referring to Figure 6, OH ^* + ㅨ CH ₃ → ㅨ CH ₂ ^* + H ₂ O

₂ CH ₂ ^* + 7O ₂ + 7OH ^* → 7CO ₂ + 8H ₂ O

Then, the sulfur oxide SO _X and NO _X pollution NOx decomposition gas and particle formation reaction are all dust by reaction of the particles from becoming fine mist, or a solid phase the liquid phase of the screen by the following steps of Scheme 4.

_{1) N 2, O 2,} H 2 O + e - → OH, O, HO 2 ( active radical generating)

2) -SO _X + OH, O, HO ₂ → H ₂ SO ₄ (sulfurization gasification reaction)

-NO _X + OH, O, HO ₂ → HNO ₃ (nitrate gasification reaction)

3) H ₂ SO ₄ + HNO ₃ , H ₂ O → (NH ₄ ) ₂ SO ₄ (ammonium sulfate misting reaction)

4) (NH ₄ ) ₂ SO ₄ + NH ₃ , H ₂ O, HNO ₃ → (NH ₄ ) ₂ SO ₄ 2NH ₄ NO ₃ (Solid particle reaction)

In the composite air filtration device according to an embodiment of the present invention, the dust collecting efficiency of each particle was measured using a particle counter, and the results are shown in FIG. 7.

7 is a graph showing the dust collection efficiency according to the particle size of the particulate contaminants by the composite air filtration device according to an embodiment of the present invention.

Referring to FIG. 7, the composite air filtration apparatus of the present invention has a dust collecting efficiency of 90% or more for dusts having a particle diameter of 0.8 μm or more and a dust collecting efficiency of 50% or more for dusts having a particle size of 0.3 μm or more (by counting method). Measurement results)

Therefore, it can be seen that the composite air filtration device of the present invention can effectively remove particulate matter by the interaction of the electrostatic precipitator, the ultraviolet photocatalyst and the pulse corona plasma, and improve the decomposition efficiency of gaseous contaminants.

In the composite air filtration apparatus according to the present invention, the air flow flowing into the duct is uniformly distributed by the vortex prevention net, and uniformly penetrates the entire surface of the pretreatment filter and the air filtration unit of the next stage, thereby improving the overall air filtration efficiency, and pretreatment. The filter replacement or cleaning cycle is extended to improve the economic efficiency.

In addition, it is possible to improve the cleanliness of the electric dust collecting part by uniformly overlapping cleaning of the dust collecting cells of the electric dust collecting part by the washing water sprayed from the plurality of water cleaning lines in the electric dust collecting part.

While the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (7)

A plasma discharge portion formed adjacent to at least one inlet of the duct, applying a high voltage to impart a charge, and decomposing gaseous contaminants using corona pulse discharge, and collecting dust charged at the rear of the plasma discharge portion. An air filtering device comprising an electrostatic precipitating unit, a water washing unit formed at a lower portion of the electrostatic precipitating unit, and washing the collected dust, and an ultraviolet photocatalyst unit formed at the rear of the electrostatic precipitating unit to oxidize and remove gaseous contaminants. Compound air filtering device including a vortex prevention net having a plurality of holes formed between the at least one inlet of the duct and the plasma discharge portion to prevent the air flow flowing from one or more inlet of the duct to interfere with each other . The combined air filtration apparatus according to claim 1, further comprising a pretreatment filter which first filters the contaminants formed between the vortex preventing net and the plasma discharge unit. The composite air filtration device according to claim 1, wherein the vortex flow preventing net is formed by plating zinc on the metal net to prevent corrosion. The combined air filtering device according to claim 1, wherein the vortex barrier has an opening ratio of 55 to 65%. The composite air filtering device according to claim 1, wherein the diameter of the hole of the vortex barrier is 3 to 15 mm. The composite air filtering device according to claim 1, wherein the thickness of the dust collecting cell of the electric dust collecting part is 10 to 100 mm. The jet washing unit of claim 1, wherein the flush unit comprises a first flush line and a second flush line in a lower portion of the electric dust collecting unit, and the jet nozzle of the first flush line and the second flush line. Compound air filtering device characterized in that the alternate arrangement.

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