JP2005087436A - Air cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air cleaner which uses streamer discharge and positively suppresses non-conductive dust sticking on the discharge surface of a discharge electrode and stably performs the streamer discharge. <P>SOLUTION: A collecting means (20) for collecting the non-conductive dust of a relatively large particle size is provided on the upstream side of a discharge device performing the streamer discharge, then, discharge inhibition on the discharge surface of the discharge device is suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air purification apparatus that removes odorous components and harmful components in the air, and more particularly to an apparatus that purifies air by generating low-temperature plasma by streamer discharge.

  2. Description of the Related Art Conventionally, as an air purification device for decomposing and removing odor components and harmful components in the air, devices utilizing glow discharge, creeping discharge, and the like are known. In these air purification devices, active species such as ozone are generated in the air by glow discharge or creeping discharge, and the treated fluid is brought into aeration contact with the activated species, so that odor components and harmful components in the treated fluid are removed. Decompose and remove. However, in glow discharge and creeping discharge, active species having a low electron temperature (active energy) such as ozone can be generated in large quantities, but only a small amount of fast electrons having a high electron temperature can be generated. Therefore, there is a limit to the ability to decompose and remove odorous components and harmful components in the fluid to be treated.

As a technique for solving this problem, an air purifier using streamer discharge can be cited. The air purifying device includes a discharge device (29) including a needle-like discharge electrode (30) and a flat counter electrode (31) facing the discharge electrode (30) as shown in FIG. 5, for example. ing. Here, when a predetermined discharge voltage is applied to both electrodes (30, 31) of the discharge device (29), the tip surface (discharge surface) of the needle-like discharge electrode (30) is directed to the counter electrode (32). A streamer discharge is generated, and a low-temperature plasma is generated accordingly. When low-temperature plasma is generated in this streamer discharge, a large amount of active species (fast electrons) having a high electron temperature can be generated, so that the odorous components and harmful components in the fluid to be treated can be efficiently decomposed and removed. Yes (see Patent Document 1).
JP 2002-336689 A

  However, the air purification device using streamer discharge disclosed in Patent Document 1 has a smaller discharge surface area in the discharge electrode (30) than the air purification device using glow discharge or creeping discharge. There is a high possibility that the discharge surface is covered with dirt such as dust. For this reason, there is a problem that the discharge is not performed well due to the adhesion of the dust and the like, and as a result, the air purification efficiency is lowered. In particular, if the particle size of the dust adhering to the discharge surface is relatively large and the dust is non-conductive, the discharge surface of the discharge electrode (30) is insulated and the air purification efficiency is greatly reduced. It is possible that That is, in order to more stably demonstrate the high air purification efficiency of the air purification device using streamer discharge, in particular, non-conductive dust having a relatively large particle diameter is removed and discharge inhibition due to dust adhesion is prevented. It is necessary to reduce the influence of

  The present invention has been made in view of such points, and an object of the present invention is to positively suppress non-conductive dust adhesion on a discharge surface of a discharge electrode in an air purification apparatus using a streamer discharge. An object of the present invention is to provide an air purification device capable of stably performing streamer discharge.

  The present invention is provided with a collecting means (20) for collecting non-conductive dust having a relatively large particle size on the upstream side of a discharge device that performs streamer discharge, and discharge on the discharge surface of the discharge device. The inhibition is suppressed.

  Specifically, in the first invention, the discharge electrode (13), the counter electrode (14) facing the discharge electrode (13), and the connection to apply a discharge voltage to both the electrodes (13, 14) are provided. Power supply means (18), and both electrodes (13, 14) are disposed in the flow space (6) of the fluid to be treated, and streamer discharge is performed between the electrodes (13, 14). It presupposes an air purifier configured to process a fluid to be processed. In this air purifying device, in the flow space (6) on the upstream side of the electrodes (13, 14), dust collecting means (η) having a collection rate (η) for dust having a particle diameter of 2 μm or more is 80% or more. 20) is provided. Here, the collection rate (η) indicates the removal rate of the dust collected by the dust collecting means (20), and represents the concentration of dust in the fluid to be processed to be processed by the dust collecting means (20). Ci, what is calculated by the following equation when the concentration of dust after the fluid to be treated is treated by the dust collecting means (20) is Co.

Collection rate (η) = (1−Co / Ci) × 100 (%)
The collection rate (η) is obtained by a weight method in which the dust concentration (Ci, Co) is measured by the weight per air volume.

  In the first invention, the collection rate (η) described above for dust having a particle size of 2 μm or more is 80 in the upstream flow space (6) between the discharge electrode (13) and the counter electrode (14) for discharging. % Of dust collection means (20) is provided. With this configuration, dust having a particle diameter of 2 μm or more in the fluid to be treated is almost collected by the dust collecting means (20). Therefore, it is possible to suppress the dust in the fluid to be treated from adhering to the discharge surface of the discharge electrode (13).

  Further, the dust of the fluid to be processed after passing through the dust collecting means (20) has a particle size smaller than 2 μm. Here, since dust having a particle diameter smaller than 2 μm is almost conductive, even if dust having this particle diameter adheres to the discharge surface of the discharge electrode (13), The possibility of reducing the discharge effect is reduced. Therefore, it is possible to reduce the influence of the discharge inhibition due to the dust adhering to the discharge electrode (13), and stable discharge can be performed.

  According to a second aspect of the present invention, in the air purification apparatus of the first aspect, the dust collecting means (20) is constituted by a filtration filter.

  In the second aspect of the invention, the dust in the fluid to be treated is removed by the filtration filter, and the dust is prevented from adhering to the discharge surface of the discharge electrode (13). The filtration filter can be easily attached to the upstream side of both electrodes (13, 14). Therefore, the adhesion of the discharge electrode (13) to the dirt can be suppressed by a simple device structure.

  According to a third aspect of the present invention, in the air purification device of the second aspect, the filtration filter is constituted by an electrostatic filter.

  In the third aspect of the invention, the electrostatic filter removes dust in the fluid to be treated, and prevents the dust from adhering to the discharge surface of the discharge electrode (13). At this time, the electrostatic filter has an effect of adsorbing dust in the fluid to be processed by electrostatic action. Therefore, the collection rate (η) having a particle diameter of 2 μm or more by the dust collecting means (20) is further improved, and the influence of the discharge inhibition due to the dust adhesion on the discharge electrode (13) can be reduced.

  According to a fourth aspect of the present invention, in the air purification apparatus of the second aspect, the filtration filter is composed of a high performance particulate air filter. Here, the high-performance particulate air filter refers to a so-called HEPA filter (high efficiency particulate air filter) having a performance of collecting 99.97% or more with respect to dust having a particle diameter of 0.3 μm. Yes.

  In the fourth aspect of the invention, the high performance particulate air filter removes dust from the fluid to be treated and prevents the dust from adhering to the discharge surface of the discharge electrode (13). Therefore, the collection rate (η) having a particle diameter of 2 μm or more by the dust collecting means (20) is further improved, and the influence of the discharge inhibition due to the dust adhesion on the discharge electrode (13) can be reduced.

  Moreover, since this high performance particulate air filter has a high collection efficiency even with respect to dust having a particle diameter of less than 2 μm, it is possible to further suppress the adhesion of dirt on the discharge surface of the discharge electrode (13). Therefore, the discharge at both electrodes (13, 14) can be performed stably.

  According to a fifth aspect of the present invention, in the air purification device of the second aspect, the filtration filter is constituted by an ultra-low-permeability air filter. Here, the ultra-low-permeability air filter is a so-called ULPA filter (ultra low penetration air filter) having a performance of collecting 99.999% or more with respect to dust having a particle size of 0.1 to 0.3 μm. It shows that.

  In the fifth aspect of the invention, the ultra-low-permeability air filter removes dust in the fluid to be treated to prevent the dust from adhering to the discharge surface of the discharge electrode (13). Therefore, the collection rate (η) having a particle size of 2 μm or more by the dust collecting means (20) is further improved, and the influence of the discharge inhibition due to the dust adhering to the discharge electrode (13) can be further reduced.

  Moreover, since this ultra-low-permeability air filter has a higher collection efficiency even with respect to dust having a particle diameter of less than 2 μm, it is possible to further suppress the adhesion of dirt on the discharge surface of the discharge electrode (13). Therefore, the discharge at both electrodes (13, 14) can be performed more stably.

  According to a sixth aspect of the present invention, in the air purification apparatus of the first aspect, the dust collecting means (20) includes an ionization section (9) for charging the dust and a collection section (10) for collecting the charged dust. The electric dust collector (20) is configured.

  In the sixth invention, the dust in the fluid to be treated is removed by the electric dust collector (20) constituted by the ionization part (9) and the collection part (10), and the dust is discharged into the discharge electrode (13). It is intended to prevent adhesion to the discharge surface. At this time, the dust in the fluid to be treated is efficiently collected by the collecting part (10) by electrostatic action, so that the collection rate (η) of dust having a particle diameter of 2 μm or more is further improved, and the discharge is performed. The influence of the discharge inhibition due to the dust adhesion on the electrode (13) can be further reduced.

  According to a seventh aspect, in the air purification device according to the sixth aspect, the collection part (10) is constituted by an electrostatic filter (20b).

  In the seventh aspect of the invention, the trapping part (10) is an electrostatic filter (10), so that the action of adsorbing dust in the fluid to be treated can be enhanced. Therefore, the collection rate (η) of dust having a particle diameter of 2 μm or more can be further improved, and the influence of discharge inhibition due to dust adhering to the discharge electrode (13) can be further reduced.

  According to the first invention, the collection rate (η) is 80% or more with respect to dust having a particle diameter of 2 μm or more, which is likely to deteriorate the discharge effect due to adhesion to the discharge surface of the discharge electrode (13). A dust collecting means (20) is provided on the upstream side of the discharge electrode (13). With this configuration, it is possible to suppress a reduction in discharge efficiency due to adhesion of dust on the discharge surface of the discharge electrode (13). Accordingly, it is possible to stably remove odor components and the like in the fluid to be treated.

  In addition, by positively suppressing the adhesion of dust, it is possible to perform safe and highly reliable discharge without causing discharge abnormality on the discharge surface of the discharge electrode (13).

  According to the second invention, a filtration filter is used as the dust collecting means (20). With this configuration, it is possible to suppress the adhesion of dust having a particle diameter of 2 μm or more on the discharge electrode (13) with an easy device structure.

  According to the third invention, an electrostatic filter is used as the dust collecting means (20). This electrostatic filter has an effect of adsorbing dust in the fluid to be treated by electrostatic action, and can more effectively suppress dust adhesion on the discharge electrode (13).

  According to the fourth aspect of the invention, the high performance particulate air filter is used as the dust collecting means (20). This high-performance particulate air filter has a high collection efficiency even with respect to dust having a finer particle diameter. Therefore, it is possible to more effectively suppress dust from adhering to the discharge surface of the discharge electrode (13).

  According to the fifth aspect of the invention, an ultra-low transmittance air filter is used as the dust collecting means (20). This ultra-low-permeability air filter has an extremely high collection efficiency even with respect to dust having a finer particle diameter. Therefore, the adhesion of dust to the discharge surface of the discharge electrode (13) can be further reduced, and the discharge at both electrodes (13, 14) can be performed more stably.

  In the sixth invention, an electrostatic precipitator (20) is used as the dust collecting means (20). With this configuration, the dust in the fluid to be treated is charged by the ionization unit (9), and the charged dust is effectively adsorbed to the collection unit (10) by electrostatic action. Accordingly, dust having a particle diameter of 2 μm or more can be almost collected, and the influence of the discharge inhibition due to dust adhering to the discharge electrode (13) can be further reduced.

  In the seventh invention, an electrostatic filter (10) is used as the dust collecting part (10) of the electric dust collector (20). Dust in the fluid to be treated charged by the ionization section (9) is collected more effectively by the electrostatic action and adsorption action of the electrostatic filter (10). Therefore, the collection rate (η) of dust having a particle diameter of 2 μm or more can be further improved, and the influence of discharge inhibition due to dust adhering to the discharge electrode (13) can be further reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view of an air purification device (1) according to an embodiment of the present invention. This air purification device (1) is a consumer-use air purification device used in ordinary homes and small stores. The air purification device (1) generates low-temperature plasma by streamer discharge by the discharge device (11) to decompose and remove odor components and the like.

  The air purification device (1) includes a box-shaped casing body (2) having one end opened, and a front cover (3) fitted to the opening. Air suction ports (4) for introducing a fluid to be processed are formed on both side surfaces of the front cover (3). An air discharge port (5) through which the fluid to be processed flows out is formed on the upper surface of the casing body (2). A flow path (6) through which the fluid to be treated flows is formed between the air suction port (4) and the air discharge port (5). The casing body (2) is provided with a fan (not shown) for circulating the fluid to be treated through the flow path (6).

  In the distribution channel (6), a functional component (7) provided for air purification is arranged. This functional component (7) consists of a pre-filter (8), an electrostatic precipitator (dust collector) (from the air suction port (4) side (upstream side) to the air discharge port (5) (downstream side) ( 20), the discharge device (11), and the catalyst section (12). These functional components (7) are arranged substantially in a straight line with respect to the flow direction of the fluid to be processed.

  The prefilter (8) is for collecting relatively large dust contained in the air as a pretreatment of the fluid to be treated.

  The electrostatic precipitator (20) disposed on the downstream side of the prefilter (8) is for collecting relatively small dust in the fluid to be treated. The electrostatic precipitator (20) includes an ionization part (ionization part) (9) and an electrostatic filter (dust collection part) (10). The ionization unit (9) is for charging the dust in the fluid to be treated. The ionization section (9) is composed of a plurality of ionization lines (9a) and a counter plate (9b) facing the ionization lines (9a). The ionization lines (9a) are vertically extended and supported in a first electrode frame (9c) that is a support of the ionization section (9), and a plurality of ionization lines (9a) are arranged at a predetermined interval. On the other hand, the counter plate (9b) has a shape having a horizontal cross section in which a plurality of U-shaped plates are connected, and the counter plate (9b) has a U-shape around each ionization line (9a). It is supported by the first electrode frame (9c) so as to surround the portion. Then, when a predetermined voltage is applied to the ionization line (9a) and the counter plate (9b), a discharge occurs between the ionization line (9a) and the counter plate (9b), and the object to be processed passes through this discharge portion. The fluid is charged with a positive charge. The counter plate (9b) is formed with a plurality of vent holes (9d) through which the fluid to be treated after charging flows.

  The electrostatic filter (10) is provided on the downstream side of the ionization section (9), and serves to adsorb and collect dust charged by the ionization section (9) by electrostatic action. This electrostatic filter (10) is a so-called roll type filter.When a certain amount of dust is collected in the electrostatic filter (10), an unused electrostatic filter (10b) 10) is pulled out to prevent clogging of the electrostatic filter (10).

  The electrostatic precipitator (20) composed of the ionization part (9) and the electrostatic filter (10) is configured as described above, and collects dust with a particle diameter of 2 μm or more in the fluid to be treated ( η) has a performance of 80% or more and 100% or less.

  A discharge device (11) for performing streamer discharge is disposed on the downstream side of the dust collecting means (20). As shown in FIG. 1, the discharge device (11) supports a discharge electrode (13), a counter electrode (14) facing the discharge electrode (13), and both the electrodes (13, 14). Second electrode frame (15). Both electrodes (13, 14) extend vertically within the frame of the second electrode frame (15) so that the discharge electrode (13) and the counter electrode (14) are alternately spaced at a predetermined interval. Side by side.

  As shown in FIGS. 2 (A) and 2 (B), the discharge electrode (13) includes a plate-like discharge substrate (13b) supported by the electrode frame (15) and both left and right sides of the discharge substrate (16). And a plurality of discharge terminals (13a) provided at predetermined intervals. The discharge end (13a) is formed in a triangular or trapezoidal plate shape.

  The counter electrode (14) has electrode surfaces on both sides of the counter electrode (14) corresponding to the discharge ends (13a) arranged on the left and right of the discharge substrate (13b). The electrodes (13, 14) alternately arranged in the electrode frame (15) perform streamer discharge on the left and right sides of the discharge substrate (13b).

  Further, the discharge device (11) includes power supply means (18) for applying a discharge voltage to the discharge electrode (13) and the counter electrode (14). In this embodiment, a DC voltage is applied to both electrodes (13, 14) as the discharge voltage of the power supply means (18).

-Driving action-
Next, the operation of the air purification device (1) will be described with reference to FIG.

  When the air purification device (1) is energized, a fan (not shown) is activated and the fluid to be processed is sucked from the air suction ports (4) on both sides of the front cover (3). The fluid to be treated sucked from the air suction port (4) is introduced into the flow path (6), flows straight toward the rear of the casing body (2), and is purified by a multi-stage process described below. .

  In the first stage, relatively large dust in the fluid to be treated is collected and removed by the prefilter (8).

  Next, in the second stage, the fluid to be processed that has passed through the prefilter (8) flows between the ionization line (9a) of the ionization section (9) and the counter plate (9b). At this time, a discharge is performed between the ionization line (9a) and the counter plate (9b), and the dust in the fluid to be treated is charged to a positive charge by this discharge. Then, the fluid to be treated after being charged passes through a plurality of vent holes (9d) formed in the counter plate (9b).

  Next, in the third stage, the fluid to be processed after passing through the vent (9) flows to the electrostatic filter (10). Here, since the dust in the fluid to be treated is charged to a positive charge, it is induced and captured by the electrostatic filter (10) by the electrostatic action of the negatively charged electrostatic filter (10). Be collected. By the processing of the electric dust collector (20) in the second and third stages as described above, the fluid to be treated is generally collected with dust having a particle diameter of 2 μm or more and introduced into the discharge device (11).

  In the fourth stage, the fluid to be treated flows between the discharge electrode (13) and the counter electrode (14) of the discharge device (11). At this time, active species having high reactivity (fast electrons, ions, radicals, other excited molecules, etc.) are generated between the electrodes (13, 14) by the low temperature plasma that develops from the discharge surface of the discharge end (13a). Has occurred. Therefore, harmful substances and odor components in the fluid to be treated are decomposed and removed by aeration contact with the active species. Further, a catalyst part (12) is disposed downstream of the discharge device (11), and decomposition of the fluid to be treated can be promoted by the catalytic action of the catalyst part (12). With such a configuration, harmful substances and odor components in the fluid to be treated are decomposed and removed with high efficiency by a synergistic effect of low temperature plasma and catalytic action. The fluid to be treated purified by the above processing is discharged upward from the air discharge port (5) of the casing body (2).

-Effect of the embodiment-
In the air purification device (1) according to the present embodiment, the following effects are exhibited.

  In the present embodiment, an electrostatic precipitator (20) is provided as a dust collecting means (20) in the upstream flow path (6) between the discharge electrode (13) and the counter electrode (14). FIG. 3 shows the dust collection performance of the electric dust collector (20). In FIG. 3, the horizontal axis represents the particle size of the dust, and the vertical axis represents the dust collection rate (η) (measured by the gravimetric method).

  From FIG. 3, in the electrostatic precipitator (20) according to the present embodiment, the collection rate (η) for dust having a particle diameter of 2 μm or more shows a value close to 100%, and is a non-conductive particle. Dust with a diameter of 2 μm or more can be collected almost completely. Therefore, almost no conductive dust having a particle diameter of less than 2 μm flows to the discharge electrode (13), and it is possible to effectively suppress the discharge from being damaged by the adhesion of dust.

  Moreover, as shown in FIG. 3, the electrostatic precipitator (20) has a high collection rate even for dust having a particle size smaller than 2 μm. Therefore, it is possible to greatly suppress the progress of dirt adhesion on the discharge electrode (13), and the air purifying device (1) can perform stable streamer discharge and decompose and remove odor components.

  Further, as another feature of the air purification device (1) according to the present embodiment, a prefilter (8), an ionization unit (9), and an electrostatic filter (10) are arranged upstream of the discharge device (11), The catalyst section (12) is arranged on the downstream side, and these are arranged in a straight line so as to sandwich the discharge device (11). By the way, at the time of discharge of the discharge device (11), a relatively large discharge sound is generated due to the streamer discharge, and this discharge sound may become noise. In the present embodiment, the discharge noise during this discharge is blocked by the prefilter (8), the ionization section (9), the electrostatic filter (10), and the catalyst section (12), and this discharge noise is reduced. be able to. Therefore, it is possible to reduce the noise of the air purification device (1). Further, when the functional members (7) are arranged in a straight line, the fluid to be treated flows in a straight line in the casing body (2). Thereby, the pressure loss at the time of a to-be-processed fluid distribute | circulates a functional member (7) can also be reduced. Therefore, the power of the fan can be reduced, and the running cost of the air purification device (1) can be reduced.

  In the present embodiment, the air suction port (4) is formed on both side surfaces of the casing body (2), and the air discharge port (5) is formed on the upper surface of the casing body (2). For this reason, the discharge sound generated during the discharge of the discharge device (11) as described above is not transmitted directly to the air suction port (4) and the air discharge port (5) from the discharge device (11), but the casing body ( 2) Reflected within and then transmitted to the air suction / discharge port (4, 5). For this reason, the discharge sound is not directly transmitted to the outside of the casing body (2), and the noise due to the streamer discharge can be further reduced. Therefore, it is possible to further reduce the noise of the air purification device (1).

<< Other Embodiments >>
The present invention may be configured as follows with respect to the above embodiment.

  In the present embodiment, an electrostatic precipitator (20) is used as the dust collecting means (20) disposed upstream of the discharge electrode (13) and the counter electrode (14). However, it is not always necessary to apply the electric dust collector (20) as the dust collecting means (20). That is, as long as it has a collection rate (η) of 80% or more with respect to dust having a particle diameter of 2 μm or more in the fluid to be treated, the dust collecting means (20) other than the electrostatic precipitator (20) is used. The present invention can also be applied to the air purification device (1).

  FIG. 4 shows the dust collection performance of a filtration filter (medium performance filter, electrostatic filter, HEPA filter, ULPA filter) which is another dust collecting means (20).

  The medium performance filter has a collection rate (η) of approximately 80% for dust having a particle diameter of 2 μm or more. This medium performance filter is relatively inexpensive and can be easily applied as the dust collecting means (20). Therefore, by applying this medium performance filter to the air purification device (1), it is possible to easily suppress the adhesion of dust on the discharge electrode (13).

  Similar to the medium performance filter, the electrostatic filter has a collection rate (η) of approximately 80% for dust having a particle diameter of 2 μm or more. The electrostatic filter shown in FIG. 4 is an NBS (National Bureau of Standards) compliant dust collection efficiency measurement method (measurement in which dust having a particle diameter of about 1 μm is sucked by a filter, and the collection rate is obtained by light transmittance. The collection rate by method is 65%. Therefore, the electrostatic filter used as the dust collecting means (20) preferably has an NBS collection rate of 65% or more. In this electrostatic filter, dust in the fluid to be treated can be collected more effectively by electrostatic action, and the adhesion of dirt on the discharge electrode (13) can be further suppressed.

  As described above, the HEPA filter and the ULPA filter have a high collection performance even with respect to dust having a fine particle diameter. In FIG. % Collection rate. Therefore, by applying the HEPA filter or the ULPA filter as the dust collecting means (20), not only dust having a particle diameter of 2 μm or more but also dust having a particle diameter of less than 2 μm can be collected very effectively. . Accordingly, it is possible to more effectively suppress the adhesion of dirt on the discharge surface of the discharge electrode (13), and the streamer discharge by the discharge device (11) can be stably performed.

  In addition, the ULPA filter has higher collection performance against even finer dust than the HEPA filter. For this reason, if the ULPA filter is applied as the dust collecting means (20), more stable streamer discharge by the discharge device (11) can be performed.

  In the present embodiment, the electrostatic filter (10) is used as the dust collecting part (10) of the electric dust collector (20). However, the dust collecting part (10) does not necessarily need to be an electrostatic filter (10). For example, a dust collecting electrode may be used as long as it can adsorb dust charged by the ionization part (9) by electrostatic action. It may be something like this. Also in this case, if the collection rate (η) for dust with a particle diameter of 2 μm or more is 80% or more, the influence of the discharge inhibition due to dust adhering to the discharge electrode (13) can be reduced, and streamer discharge can be stabilized. Can be done.

It is a disassembled perspective view which shows the whole structure of the air purification apparatus which concerns on this embodiment. 2A is a configuration diagram of the discharge device as viewed from above, and FIG. 2B is an enlarged side view of the discharge electrode. It is a graph which shows the collection performance with respect to the dust of the electric dust collector which concerns on this embodiment. It is a graph which shows the collection performance with respect to the dust of the dust collection means which concerns on other embodiment. It is the schematic which shows the principal part structure of the discharge device in a prior art.

Explanation of symbols

(9) Ionization part
(10) Dust collector
(11) Discharge device
(13) Discharge electrode
(14) Discharge electrode
(18) Power supply means
(20) Dust collection means
(η) Collection rate

Claims (7)

A discharge electrode (13), a counter electrode (14) facing the discharge electrode (13), and a power supply means (18) connected to apply a discharge voltage to the electrodes (13, 14). The electrodes (13, 14) are arranged in the flow space (6) of the fluid to be treated, and are configured to treat the fluid to be treated by performing a streamer discharge between the electrodes (13, 14). An air purification device,
The flow space (6) upstream of the electrodes (13, 14) is provided with dust collecting means (20) having a collection rate (η) of 80% or more for dust having a particle diameter of 2 μm or more. An air purifier characterized by. The air purification device according to claim 1,
The air purification apparatus, wherein the dust collecting means (20) is constituted by a filtration filter. The air purification apparatus according to claim 2,
The air purification device, wherein the filtration filter is constituted by an electrostatic filter. The air purification device according to claim 2,
An air purification device, wherein the filtration filter is composed of a high performance particulate air filter. The air purification device according to claim 2,
The air filter according to claim 1, wherein the filtration filter comprises an ultra-low-permeability air filter. The air purification device according to claim 1,
The dust collecting means (20) is an electric dust collector (20) composed of an ionization part (9) for charging dust and a collection part (10) for collecting charged dust. Air purification device to do. The air purification apparatus according to claim 6,
The air purification device, wherein the collection part (10) is constituted by an electrostatic filter (10).

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