Fanless fine dust collection and noise absorption device

Abstract

A fanless noise absorption device with a frontal panel 121 on a main body with a dust collection unit 130 to one side to purify air flowing into an inlet of the main body and out an outlet; the dust c

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0000000 filed on September 6, 2019, the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND 1. Field of the Invention The present invention relates to a dust collection and noise absorption device, and more particularly, to a fanless fine dust collection and noise absorption device capable of removing fine dust generated from railroads, roads, and construction sites without power, and at the same time, efficiently reducing noise. 2. Discussion of Related Art Noise barriers, which are walls for preventing noise from spreading by reflecting or absorbing noise, are installed around railroads, roadsides, schools, and apartments to prevent noise from affecting residential life. In this way, most noise barriers are installed around railroads or roads where noise is continuously generated. In addition to noise generated by vehicles on railroads or roads, soot, fine dust, and sand are generated and spread into air as vehicles move, and thus these air pollutants may spread outside the noise barriers and affect daily life. Accordingly, in order to reduce noise and air pollution, dust collectors and noise barriers are installed around railroads or roads. However, when dust collectors and noise barriers are installed separately, there is a problem in terms of cost. Dust collectors include a power device such as a blower unit that introduces external air to remove dust included in the external air, and thus when the blower unit is applied to a noise barrier applied to an underground station and a tunnel wall, there are problems in terms of maintenance, costs, breakdowns due to complex structures, possibilities of malfunctions, and an increase in size of the entire noise barrier. To solve these problems, Korean Patent Registration No. 10-2284828 and Korean Patent Registration No. 10-2284836 disclose a dust collector that simultaneously reduces noise and fine dust. However, the above related art has an advantage in that a power device such as a blower unit is not required through dust collection using an ion wind generated by a corona discharge, but have a problem in that it is difficult to commercialize the dust collector due to a high concentration of ozone generated during a corona discharge, and thus the development of a technology for solving this problem is required. Further, the above related art has problems in that the discharge part itself has no water-repellent structure and thus unstable operation due to sparks generated by water droplets during water cleaning cannot be prevented, and there is no sound absorbing means capable of attenuating sound waves incident through a hole of a sound absorption pail. In particular, in existing dust collectors using a corona discharge, when a pin-type discharge part is used instead of a wire-type discharge part, a discharge start voltage and an operating voltage are relatively low, and thus stable discharge characteristics and durability are achieved, but an ozone generation concentration increases. Thus, the development of a new pin-type discharge part capable of maintaining collection efficiency (ion wind speed) while reducing the ozone generation concentration is required. [Related Art Documents] [Patent Documents] KR 10-2284836 Bl (2021.08. 03) KR 10-2284828 Bl (2021.08, 03) SUMMARY OF THE INVENTION The present invention is directed to providing a fanless fine dust collection and noise absorption device that maintains collection efficiency while reducing an ozone generation concentration by providing a new type of pin-type discharge part. The present invention is also directed to providing a fanless fine dust collection and noise absorption device that may be easily cleaned with water to remove collected dust by applying a super water-repellent design to a discharge plate and a discharge plate support. The present invention is also directed to providing a fanless fine dust collection and noise sound absorption device having improved noise absorption performance by having an internal sound absorption panel capable of attenuating sound waves incident through a hole of a sound absorption unit. A fanless fine dust collection and noise absorption device according to the present invention includes a main body having an inlet provided in one side thereof and an outlet provided in the other side thereof opposite to the inlet, a sound absorption unit provided with a front sound absorption panel located on a front surface of the main body, and a dust collection unit that is provided on one side of the front sound absorption panel, purifies external air flowing into the inlet of the main body, discharges the purified air through the outlet of the main body, wherein the dust collection unit includes a housing installed adjacent to the inlet inside the main body, a plurality of discharge plates arranged at regular intervals at the inlet, inside the housing and having discharge pins formed at regular intervals, a plurality of collecting electrodes installed to be spaced apart from the discharge pins toward the outlet side and having a polarity opposite to that of the discharge pins, and a plurality of non-collecting electrodes arranged alternately with the collecting electrodes and having the same polarity as the discharge pins, and a thickness of the discharge pin ranges from 0.01 mm to 1.0 mm, a distance between the discharge pins ranges from 15 mm to 50 mm, and an ozone concentration generated when an ion wind is generated from the inlet to the outlet by the arrangement of the discharge pins, the collecting electrodes, and the non-collecting electrodes is less than 0.02 ppm. A distance between the discharge pin and the collecting electrode and a distance between the discharge pin and the non-collecting electrode may range from 10 mm to 40 mm. A distance between the collecting electrode and the non-collecting electrode may range from 10 mm to 40 mm. The discharge plate may be formed as a long strip-shaped plate, and an isosceles triangular' discharge part in which a negative voltage or a positive voltage applied to the discharge plate is collected may be formed at regular intervals toward the collecting electrode, and the discharge pin may be formed at an end edge of the discharge part located toward the collecting electrode. The discharge plate including the discharge pin and the discharge part may be manufactured of one of stainless steel, tungsten, plated steel, and plated tungsten to have a predetermined thickness. The housing may be provided with a first support and a second support crossing each other to support the plurality of discharge plates, and lower surfaces of the first support and the second support may be formed in a serrated shape. The front sound absorption panel may include an inflow surface provided with a plurality of holes through which the purified air is discharged and a non-inflow surface in which the holes are not formed, the dust collection unit may be installed at the non-inflow surface of the front sound absorption panel, and the sound absorption unit may further include an internal sound absorption panel that attenuates sound waves incident through the hole of the front sound absorption panel on a rear surface of the main body at the inflow surface. The fanless fine dust collection and noise absorption device according to the present invention may be provided as a plurality of device, the fanless fine dust collection and noise absorption devices may be consecutively installed, and a sound absorption material may be provided between the main bodies of adjacent fanless fine dust collection and noise absorption devices during the consecutive installation. When the fanless fine dust collection and noise absorption devices are consecutively installed, in some devices, the sound absorption material may be installed instead of the dust collection unit. The fanless fine dust collection and noise absorption device may further include an emergency call controller that detects whether the dust collection unit is abnormal and a signal generator that generates an emergency signal according to the detection result of the emergency call controller. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present disclosure will become more apparent to those of ordinary skill in the art by describing exemplary embodiments thereof in detail with reference to the accompanying drawings, in which: FIG. 1 is a perspective view of a fanless fine dust collection and noise absorption device according to the present invention; FIG. 2 is a side cross-sectional view of the fanless fine dust collection and noise absorption device according to the present invention; FIG. 3 is a front cross-sectional view of the fanless fine dust collection and noise absorption device according to the present invention; FIG. 4 is a transverse cross-sectional view for describing a dust collection unit in the fanless fine dust collection and noise absorption device according to the present invention; FIG. 5 is an enlarged side cross-sectional view for describing the dust collection unit in the fanless fine dust collection and noise absorption device according to the present invention; FIG. 6 is an enlarged front cross-sectional view of part A of FIG. 3; FIGS. 7A to 7C are views illustrating that the fenless fine dust collection and noise absorption device according to the present invention is applied to an installation structure; FIG. 8A and 8B are views illustrating an example in which the fanless fine dust collection and noise absorption device according to the present invention is consecutively installed; FIG. 9 is a view illustrating a flow diagram of an emergency call of the fanless fine dust collection and noise absorption device according to the present invention; FIG. 10 is a view illustrating an assembled state of the fanless fine dust collection and noise absorption device according to the present invention; FIG. 11 is a graph showing the comparison of ion wind speeds of a wire-type discharge part and a pin-type discharge part according to an embodiment of the present invention; and FIG. 12 is a graph showing the comparison of ozone generation concentrations of the pin-type discharge part according to the embodiment of the present invention. DEFAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, detailed descriptions of widely known functions and configurations that may unnecessarily obscure the gist of the present invention will be omitted. The present invention relates to a fanless fine dust collection and noise absorption device 100 capable of removing fine dust generated from railroads, roads, and construction sites without power, and at the same time, efficiently reducing noise. As illustrated in FIGS. 7A to 7C, when the fanless fine dust collection and noise absorption device 100 is used as a wall and a cavity cover at a lower end of a tunnel, the fanless fine dust collection and noise absorption device 100 may be installed and applied to various installation structures 150, for example, a cavity or a general noise barrier below7 a platform. In addition, the fanless fine dust collection and noise absorption device 100 may applied to all areas to simultaneously reduce noise and fine dust such as railroads, roads, and construction sites, or the like. Referring to FIGS. 1 to 6, the fanless fine dust collection and noise absorption device 100 according to the present invention may include a main body 110, a sound absorption unit 120, and a dust collection unit 130. The main body 110 may provide a frame for installing the sound absorption unit 120 and the dust collection unit 130 and may include a front surface to which a front sound absorption panel 121 is fixed, both side surfaces connected to both sides of the front sound absorption panel 121 and extending a certain length, and a rear surface connected to both side surfaces, and a lower portion and an upper portion thereof may be open. The open upper portion of the main body 110 may be an inlet 111 through which external air flow's thereinto, and the open lower portion of the main body 110 may be an outlet 112 through which purified air from which dust included in the external air is removed by the dust collection unit 130 is discharged. Inside the main body 110, the dust collection unit 130 fixed by both side surfaces and the rear surface of the main body 110 is installed, and an internal sound absorption panel 123 located below' the dust collection unit 130 and fixed to the rear surface of the main body 110 is further installed. Further, in an internal space of the main body 110, a support 113 extending a certain length from both side surfaces and the rear surface toward the internal space may be provided so that the dust collection unit 130 may be seated thereon. The outlet 112 of the main body 110 may have an open structure without a structure such as a cover, and an air guide unit (not illustrated) may be further installed to smoothly discharge purified air. The sound absorption unit 120 includes a front sound absorption panel 121 forming a front surface of the main body 110 and the internal sound absorption panel 123 fixed to the rear surface of the main body 110 to be located below the dust collection unit 130 inside the main body 110, and reflects or absorbs noise to prevent the noise from spreading. The front sound absorption panel 121 and the internal sound absorption panel 123 may be manufactured in the shape of a flat plate using a sound absorption material that absorbs noise. The front sound absorption panel 121 may include an inflow surface 121a provided with a plurality of holes 122 through which purified air is discharged and a non-inflow surface 121b in which the holes 122 are not formed. The dust collection unit 130 may be installed on one side of the non-inflow surface 121b of the front sound absorption panel 121. The plurality of holes 122 may be provided in the front sound absorption panel 121 to discharge purified air and may serve as a passage for discharging purified air to the outside of the main body 110 while reducing noise. The front sound absorption panel 121 may also serve to protect the dust collection unit 130 from an external impact. Further, the internal sound absorption panel 123 serves to allow sound waves incident through the holes 122 of the front sound absorption panel 121 to be absorbed in a resonant frequency band by a rear air layer inside the main body 110, then hit the sound absorption material, and attenuated again. Accordingly, noise attenuation performance of the fanless fine dust collection and noise absorption device 100 according to the present invention may be further improved. The internal sound absorption panel 123 is formed in a flat plate structure without holes and with a thickness at which the outlet 112 of the main body 110 is not blocked. In the present invention, the front sound absorption panel 121 and the internal sound absorption panel 123 constituting the sound absorption unit 120 have a sound absorption rate of NRC 0.7 or higher and non-combustibility suitable for semicombustible standards, and are preferably manufactured of aggregate sound absorption materials having a freeze-thaw resistance of 70% or more of a compressive strength ratio. The dust collection unit 130 may be installed on one side of the front sound absorption panel 121, specifically, on the non-inflow surface 121b side of the front sound absorption panel 121. The dust collection unit 130 may purify the external air flowing into the inlet 111 of the main body 110 without power and discharge the purified air through the outlet 112 of the main body 110 and the holes 122 of the front sound absorption panel 121 and may include a housing 131, a discharge plate 132, a collecting electrode 133, and a non-collecting electrode 134. The housing 131 may provide a frame in which the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134 may be installed and may include a frame 131a, a discharge plate support 131b, and an electrode support. 131c. In this case, the housing 131 is equipped with handles (not illustrated) on both outer sides to facilitate the removal of the housing 131 from the fanless fine dust collection and noise absorption device 100 during replacement or water cleaning. A lower portion of the frame 131a may be fixedly seated on the support 113 of the main body 110, and a peripheral surface thereof may come into close contact with both side surfaces and the rear surface of the main body 110. In this case, as illustrated in FIG. 10, an assembly configuration may be formed such that brackets 130a seated on both side surfaces of the main body 110 may be provided to protrude from the frame 131a of the dust collection unit 130 and this may be fixedly installed on the main body 110 by fixing means such as bolts. The discharge plate support 131b may be installed above the frame 131a to support the discharge plate 132 at regular intervals. The electrode support 131c may be installed below the frame 131a to support the collecting electrode 133 and the non-collecting electrode 134 at regular intervals. The discharge plate support 131b includes a first support 1311 to which each discharge plate 132 is coupled and a second support 1322 that supports the first support 1311 with respect to the housing 131 at regular intervals so that the discharge plates 132 may be installed at regular intervals. That is, the plurality of discharge plates 132 may be supported on the discharge plate support 131b and arranged on the inlet 111 side inside the housing 131 at regular intervals. In this case, the first support 1311 and the second support 1322 of the discharge plate support 131b may have serrated shapes formed on their lower surfaces, may minimize the tension of water droplets during water cleaning to prevent water droplets from being formed, and may prevent sparks generated by the water droplets formed on the discharge plate 132, and thus the device can be stably used. The discharge plate 132 may generate a corona discharge by applying a negative or positive voltage to a metal plate to generate ions and may act as an emitter. Referring to FIG. 6, in the present invention, the discharge plate 132 is formed as a long strip-shaped plate, an isosceles triangular discharge part 132a in which the negative or positive voltage applied to the discharge plate 132 is collected is formed at regular intervals toward the collecting electrode 133 and the noncollecting electrode 134, and a discharge pin 132 b in which a corona, discharge occurs is formed at an edge of an end of the discharge part 132a located toward the collecting electrode 133 and the non-collecting electrode 134. The discharge plate 132 may be formed such that a lower end surface between the discharge parts 132a has a water-repellent structure 132c that may minimize the tension of water droplets during water cleaning, and thus the water droplets formed on the discharge plate 132 can be minimized. The discharge plate 132 may be installed by welding or the like to the first support 1311, and the discharge part 132a and the discharge pin 132b may be integrally formed with the discharge plate 132 or may be separately formed and then coupled. The discharge plate 132 which includes the discharge part 132a and the discharge pin 132b is made of a metal such as stainless steel, tungsten, plated steel, and plated tungsten to have a certain thickness. In the present invention, a distance p between the discharge pins, a distance d between the discharge pins and the collecting (non-collecting) electrodes, a distance between the collecting electrode and the non-collecting electrode, and a thickness t of the discharge plate (discharge part and discharge pin) are set as follows to obtain a low ozone generation concentration while collection efficiency (ion wind speed) is maintained. - distance p between discharge pins: 15 to 50 mm - distance d between discharge pins and collecting (non-collecting) electrodes: 10 to 40 mm - distance between collecting electrode and non-collecting electrode: 10 to 40 mm - thickness t of discharge plate (discharge part and discharge pin): 0.01 to 1.0 mm In the above numerical ranges, a thickness of the discharge pin 132b of the pin-type discharge part is very thin (e.g., 0.025 mm) and an interval between the discharge pins 132b increases as compared to the related art. Through this, it was confirmed that the outlet wind speed or collection efficiency were maintained at levels similar to those of the conventional wire-type discharge part (see FIG. 11) and the ozone generation concentration decreased as compared to the conventional pintype (see FIG. 12), In particular, as illustrated in FIG. 12, it was confirmed that the pin-type discharge part having a numerical range according to the present invention had a very low ozone generation concentration of less than 0.02 ppm which is similar to a case in which an ozone reducing filter is added, and the concentration was maintained at a certain level over time (in the case of a device to which the conventional pin-type discharge part is applied, ozone is generated at a level of 0.1 ppm). The collecting electrode 133 may be installed to be spaced apart from the discharge pin 132b toward the outlet 112, may include a plurality of first metal plates having a polarity opposite to that of the discharge pin 132b to induce ions generated from the discharge pin 132b, and may generate an ion wind together with the discharge pin 132b. In this case, the collecting electrode 133 may act as a collector. The plurality of first metal plates constituting the collecting electrode 133 may be provided parallel to each other at predetermined intervals and arranged alternately at a first distance in a direction of the plurality of discharge pins 132 b and the outlet 112. The non-collecting electrode 134 may include a plurality of second metal plates having the same polarity as the discharge pin 132b. The plurality of second metal plates constituting the non-collecting electrode 134 may be alternately arranged in parallel with the plurality of first metal plates constituting the collecting electrode 133 and arranged side by side at a second distance greater than the first distance in the direction of the plurality of discharge pins 132b and the outlet H 2. The dust collection unit 130 may remove dust contained in the external air without power and without a blower unit by applying voltages to the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134. Specifically, when the discharge pin 132b generates ions, the generated ions are guided to the collecting electrode 133 to generate an ion wind that flows toward the outlet 112, That is, as the ions generated from the discharge pin 132b move to the collecting electrode 133 including the first metal plates having a polarity opposite to that of the discharge pin 132b, since momentum is transferred to neutral air molecules by collisions with the neutral air molecules, an ion wind is generated. Due to such ion wind, the external air may flow to the outlet 112 through a gap between the collecting electrodes 133 without power and without a blower unit. In this case, fine dust particles included in the external air drawn in by the ion wind collides with ions to cause the particles to become charged, and the charged particles also move and attach to the first metal plates, which are the collecting electrode 133. That is, the dust included in the external air collides with ions generated from the discharge pin 132b and is charged with the same polarity as the discharge pin 132b, and the charged dust is collected on the collecting electrode 133 by an attractive force with the collecting electrode 133 having an opposite polarity. In addition, the charged dust is collected on the collecting electrode 133 while being prevented from flowing to the outlet 112 by a repulsive force with the non-collecting electrode 134 having the same polarity. Meanwhile, as the discharge plate 132 is disposed above the collecting electrode 133 and the non-collecting electrode 134, the water droplets formed on each component during water cleaning fall in a downward direction in which the outlet 112 is formed by gravity and are removed. Further, a force for removing the water droplets increases due to the ion wind generated during the operation of the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134, and the water droplets remaining on the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134 are minimized. Thus, a water repellent effect can increase, and the occurrence of sparks can be prevented. Further, dust collected on the collecting electrode 133 may be removed using a mobile high-pressure cleaner and a vacuum cleaner. Meanwhile, the inlet 111 and the outlet 112 of the main body 110 are arranged in a flow direction of the ion wind generated from the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134 of the dust collection unit 130. In the above, it has been described that, since the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134 are vertically arranged from top to bottom and the ion wind is generated from top to bottom and the inlet 111 and the outlet 112 are formed at an upper portion and a lower portion of the main body 110, respectively, the external air flows into the upper inlet 111 and the purified air is discharged through the lower outlet 112 without power by the flow of the ion wind. However, when the vertical arrangement is changed when the dust collection unit 130 is installed, the vertical arrangement of the inlet 111 and the outlet 112 may also be changed to correspond to the flow of the ion wind. The fanless fine dust collection and noise absorption device 100 according to the present invention is a fanless dust collection device without a blower unit. Since the sound absorption unit 120 made of a high-strength sound absorption material is included as one component, the durability of the device may be secured. The direction of air flow may be induced in various directions according to the structure of the sound absorption unit 120. Also, as the dust collection unit 130 is installed inside the main body 110, an air layer inside the main body 110 may improve low-frequency noise reduction performance to help improve acoustical performance as compared to a general noise barrier. Further, a high voltage applied to the dust collection unit 130 by the sound absorption unit 120 may be prevented from being transmitted to the user or affecting the outside. Further, the fanless fine dust collection and noise absorption device 100 according to the present invention reduces noise and fine dust at the same time, and according to the test results of an accredited testing agency, it was found that the fanless fine dust collection and noise absorption device 100 has excellent performance as a fanless dust collection device by having a reduction efficiency of 70% or more for fine dust particles having a diameter of 0.3 pm with only one module having a size of 700*260*90 mm. The reduction efficiency of the fine dust may be further improved according to a size of the device or an applied voltage. Sound absorption performance varies depending on a thickness of the sound absorption material and whether the sound absorption material is perforated, and when a flat plate shape having a thickness of 50 mm is applied, excellent performance of NRC 0.75 or more can be secured. Meanwhile, fanless fine dust collection and noise absorption devices 100 according to the present invention may be consecutively installed to improve fine dust collection efficiency and noise reduction performance. When the devices are consecutively installed, as illustrated in FIG. 8A, a sound absorption material 140 is added between the main bodies 110 of the adjacent fanless fine dust collection and noise absorption devices 100 to increase sound absorption. When the sound absorption material 140 is added between the main bodies 110 of adjacent fenless fine dust collection and noise absorption devices 100, a sound absorption rate is improved by 10% or more. Further, as illustrated in FIG. 8B, no dust collection unit 130 is installed inside the fanless fine dust collection and noise absorption device 100, and in some devices, a sound absorption material 140a is added instead of the dust collection unit 130 to improve sound absorption performance. Meanwhile, as illustrated in FIG. 9, the fanless fine dust collection and noise absorption device 100 according to the present invention is provided with an installed emergency call controller 150 and a signal generator 152 to check whether there is a malfunction. That is, the emergency call controller 150 detects whether a malfunction such as a short circuit in the dust collection unit 130 occurs, and according to the detection result, the signal generator 152 such as lighting equipment installed above and below the fanless fine dust collection and noise absorption device 100 is called and lit up so that an operator may select a broken device and perform maintenance such as repair and replacement. In this way, the fanless fine dust collection and noise absorption device 100 according to the present invention may constitute the discharge fin 1.32b that generates the ions and the collection electrode 133 that has a polarity opposite to that of the discharge fin 132b and induces the ions to generate the ion winds, and may allow the external air to be introduced by the generated ion winds and thus collect the dust (dust charged by colliding with the ions) included in the external air by an attractive action of the collection electrode 133 without power without a blower unit. Thus, the device can be compacted. Further, the fanless fine dust collection and noise absorption device 100 according to the present invention may include the non-collecting electrode 134 having the same polarity between the discharge pin 132b and the collecting electrodes 133 in parallel, so that the charged dust included in the external air may be pushed by a repulsive force, and thus the charged dust may be more easily collected on the collecting electrodes 133 located on both sides. Further, in the fanless fine dust collection and noise absorption device 100 according to the present invention, as the dust collection unit 130 including the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134 is installed on the front sound absorption panel 121 of the sound absorption unit 120, the dust collection unit 130 can be protected from an external impact by the front sound absorption panel 121, and noise and fine dust can be efficiently reduced at the same time. Further, the fanless fine dust collection and noise absorption device 100 according to the present invention may be simply configured even while efficiently reducing noise and fine dust at the same time, and thus easily installed in a narrow tunnel and easily maintained. Further, the fanless fine dust collection and noise absorption device 100 according to the present invention may generate an ion wind from the inlet 111 to the outlet 112 by the arrangement of the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134 and minimize water remaining on the discharge plate 132, the collecting electrode 133, and the non-collecting electrode 134 by gravity and the ion wind during water cleaning. Further, the fanless fine dust collection and noise absorption device 100 according to the present invention may easily perform water cleaning to remove collected dust by applying a super water-repellent design to the discharge plate 132 and the discharge plate support 131b. Further, the fanless fine dust collection and noise absorption device 100 according to the present invention can further improve noise reduction performance by additionally providing the internal sound absorption panel 123 capable of attenuating the sound waves incident through the hole 122 in the sound absorption unit 120. In particular, the fanless fine dust collection and noise absorption device 100 according to the present invention may provide optimal numerical ranges for the distance between the discharge pins of the pin-type discharge part, the distance between the discharge pin and the collecting (non-collecting) electrode, the distance between the collecting electrode and the non-collecting electrode, and the thickness of the discharge plate (discharge part and discharge pin), and thus may obtain a low ozone generation concentration while maintaining the collection efficiency (the ion wind speed). A fanless fine dust collection and noise absorption device according to the present invention can provide optimal numerical ranges for a distance between discharge pins of a pin-type discharge part, a distance between the discharge pin and a collecting (non-collecting) electrode, a. distance between the collecting electrode and the non-collecting electrode, and a thickness of a discharge plate (discharge part and discharge pin), and thus can obtain a low ozone generation concentration while maintaining the collection efficiency (the ion wind speed). Further, as a water-repellent structure is formed on a discharge plate and a discharge plate support, the tension of water droplets can be minimized during water cleaning, and thus a phenomenon in which water droplets are formed on the discharge plate can be minimized. Further, as an internal sound absorption panel capable of attenuating sound waves incident through a hole is additionally provided in a sound absorption unit, noise reduction performance can be further improved. Hereinabove, embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the embodiments disclosed in the specification and the accompanying drawings are only used for easily describing the technical spirit of the present invention and are not used for limiting the scope of the present invention described in the appended claims. Thus, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

Claims

26WHAT IS CLAIMED IS:

1. A fanless fine dust collection and noise absorption device comprising:a main body having an inlet provided in one side thereof and an outlet 5 provided in the other side thereof opposite to the inlet;a sound absorption unit provided with a front sound absorption panel located on a front surface of the main body; anda dust collection unit provided on one side of the front sound absorption panel and configured to purify external air flowing into the inlet of the main body 10 and discharge the purified air through the outlet of the main body,wherein the dust collection unit includes:a housing installed adjacent to the inlet inside the main body;a plurality of discharge plates arranged at regular intervals at the inlet inside the housing and having discharge pins formed at regular intervals, each of the 15 discharge plates being formed as a long strip-shaped plate and including an isosceles triangular discharge part protruding toward an outlet side at regular intervals along an edge of the strip-shaped plate on the outlet side, and a discharge pin having a rectangular cross-section extending from an end edge of the discharge part on the outlet side and configured to generate a corona discharge;20 a plurality of collecting electrodes installed to be spaced apart from thedischarge pins toward the outlet and having a polarity opposite to that of the discharge pins; anda plurality of non-collecting electrodes arranged alternately with the collecting electrodes and having the same polarity as the discharge pins, and25 a thickness of the discharge pin ranges from 0.01 mm to 1.0 mm, a distance31 03 26between the discharge pins ranges from 15 mm to 50 mm, and an ozone concentration generated when an ion wind is generated from the inlet to the outlet by the arrangement of the discharge pins, the collecting electrodes, and the noncollecting electrodes is less than 0.02 ppm.

52. The fanless fine dust collection and noise absorption device of claim 1, wherein a distance between the discharge pin and the collecting electrode and a distance between the discharge pin and the non-collecting electrode range from 10 mm to 40 mm.

103. The fanless fine dust collection and noise absorption device of claim 1 or 2, wherein a distance between the collecting electrode and the non-collecting electrode ranges from 10 mm to 40 mm.15 4. The fanless fine dust collection and noise absorption device of claim 1,wherein the discharge plate including the discharge pin and the discharge part is manufactured of one of stainless steel, tungsten, plated steel, and plated tungsten to have a predetermined thickness.20 5. The fanless fine dust collection and noise absorption device of claim 1,wherein the housing is provided with a first support and a second support crossing each other to support the plurality of discharge plates, and lower surfaces of the first support and the second support are formed in a serrated shape.25 6. The fanless fine dust collection and noise absorption device of claim 1,31 03 26wherein the front sound absorption panel includes an inflow surface provided with a plurality of holes through which the purified air is discharged and a non-inflow surface in which the holes are not formed,the dust collection unit is installed at the non-inflow surface of the front5 sound absorption panel, andthe sound absorption unit further includes an internal sound absorption panel configured to attenuate sound waves incident through the hole of the front sound absorption panel on a rear surface of the main body at the inflow surface.10 7. The fanless fine dust collection and noise absorption device of claim 1,further comprising:an emergency call controller configured to detect whether the dust collection unit is abnormal; anda signal generator configured to generate an emergency signal according to a15 detection result of the emergency call controller.s

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