JP2000046358A - Electrostatic air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrostatic air cleaning method suitable for removal of dust in wide space. SOLUTION: An electrostatic air cleaner 1 is equipped with a DC high-voltage power source 8, a discharge electrode 7 which performs corona discharge, having either negative or positive high voltage applied by the DC high-voltage power source, a dust collecting electrode 5 which attracts the particles charged with corona discharge by electrostatic force, having the other the high voltage applied by the DC high-voltage power source 8, and a collecting member 9 which catches the charged particles attracted by the dust collecting electrode 5, being provided to cover the dust collecting electrode 5. The dust collecting electrode 5 is arranged at the center of the device 1, and a discharge electrode 7 is arranged around the dust collecting electrode 5, and an air suction port 10 is provided in the periphery of the device 1 outside the discharge electrode 7, and an air discharge port 11 is provided in the position facing the center of the dust collecting electrode 5, and a fan 12 for accelerating the air flow sucked in through the air suction port 10 and discharged from the air discharge port 11 is provided in the discharge port 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic air purifying apparatus that uses static electricity to adsorb and remove particles such as dust in the air.

[0002]

2. Description of the Related Art Generally, air contains dust such as smoke particles of cigarettes, pollen and mite droppings which cause allergies, and purifies the air by removing these particles. Doing so is said to be effective in maintaining health and preventing allergies. Devices for purifying air in this manner are roughly classified into filter-type devices and electrostatic-type devices.

FIG. 6 is a diagram showing a schematic configuration of a general filter type air cleaning device, and FIG. 7 is a diagram showing a VII-VI of FIG.
It is an I line sectional view. The filter-type air purifying apparatus a has a filter c at an air inlet b on the front and a fan e with a drive motor at an air outlet d on the upper surface. Fan e
Drives a motor connected to an external power supply (not shown) to suck air from the air suction port b and discharge air from the air discharge port d to circulate the air. When air is sucked from the air inlet b through the filter c, dust in the air is captured by the filter c. As a result, dust is removed from the air, and the air is cleaned. This filter c
Known are a filter that mechanically captures dust, an electric filter that electrostatically captures dust, and a physical and chemical deodorizing filter.

[0004] However, the filter has a large pressure loss for passing the airflow, and the pressure loss increases as dust is collected and deposited. Therefore, there is an inconvenience that the filter needs to be cleaned in a short cycle. . Further, in order to lengthen the cleaning interval, it is necessary to increase the filter area, and it is necessary to employ a fan having a high discharge output.

Next, FIG. 8 is a view showing a schematic configuration of a conventional electrostatic air cleaning apparatus, and FIG. 9 is a sectional view taken along line IX-IX of FIG. The electrostatic air cleaning device f includes a back panel g made of an insulating flat plate, a dust collecting electrode h made of two metal flat plates adhered to the upper and lower surfaces of the back panel g, and a support member i. , A discharge electrode j composed of a metal wire arranged in a horizontal direction in the front center space of the back panel g, a negative output connected to the discharge electrode j, and a positive output connected to the dust collection electrode h. High voltage power supply k and dust collecting paper l covering dust collecting electrode h
And a front cover m made of an insulating material. The front cover m is formed in a louver shape so that dust in the air can freely enter and exit from the front and up and down.

When a negative high voltage is applied to the discharge electrode j by the DC high voltage power supply k and a positive high voltage is applied to the dust collecting electrode h,
Corona discharge occurs at the discharge electrode j, and particles such as dust are negatively charged. The negatively charged particles are attracted to the positive dust collecting electrode h by the electrostatic force, adhere to the dust collecting paper l covering the dust collecting electrode h, and are collected. In addition, due to the movement of the charged particles as described above, an airflow that is sucked into the apparatus from the center of the front cover m and discharged upward and downward is formed as shown by an arrow in FIG. As a result, the airflow sucked from the center of the front cover m collects and removes particles such as dust contained therein in the dust collecting paper l, is cleaned, and is discharged from above and below the front cover m. .

However, since the electrostatic force acting on the dust is inversely proportional to the square of the distance, in the conventional apparatus f, the dust near the apparatus can be sucked, but the dust collecting action becomes weaker as the distance increases. . For this reason, there is an inconvenience that dust in a large space cannot be quickly removed as compared with a filter-type air cleaning device having a fan.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrostatic air cleaning apparatus suitable for removing dust in a wide space in view of the above-mentioned disadvantages.

[0009]

In order to achieve the above object, the present invention provides a DC high-voltage power supply, and a discharge electrode for applying a negative or positive high voltage by the DC high-voltage power supply to perform corona discharge. The other high voltage is applied by the DC high-voltage power supply, a dust collecting electrode that attracts particles charged by the corona discharge by electrostatic force, and provided so as to cover the dust collecting electrode,
A collecting member for adhering the charged particles sucked to the dust collecting electrode, wherein the discharge electrode is arranged around the planarly formed dust collecting electrode; An air suction port is provided on the outer peripheral portion of the dust collecting electrode, and an air discharge port is provided at a position facing the center of the dust collecting electrode to promote an air flow sucked from the air suction port and discharged from the air discharge port. A fan is provided at the air discharge port.

According to the electrostatic air cleaning apparatus of the present invention, for example, when a negative high voltage is applied to the discharge electrode and a positive high voltage is applied to the dust collecting electrode, corona discharge is performed at the discharge electrode. Particles such as smoke particles and dust in the air are negatively charged. The negatively charged particles move toward the positive dust collection electrode by the electrostatic force, and adhere to and collect on the collection member covering the dust collection electrode.

With the movement of the charged particles, an air flow is formed from the surrounding discharge electrodes to the central dust collection electrode. Further, an air suction port is provided at a peripheral portion outside the discharge electrode, and an air discharge port is provided at a position facing the center of the dust collection electrode, so that the air flow is sucked from the air suction port at the peripheral portion. Then, it is formed so as to be directed from the peripheral discharge electrode to the central dust collecting electrode and discharged from the central air discharge port. Further, the air flow is promoted by the fan, and the air in the space is smoothly circulated.

As a result, the circulation in which the air in the space is sucked in from the air suction port and discharged from the air discharge port is smoothly formed, and the air in the wide space can be quickly led to the two electrodes. As a result, dust and the like in the air in a wide space can be removed to clean the air.

Further, unlike the filter type, air is not sucked through the filter, so that even if dust or the like accumulates on the collecting member, the air flow is not hindered. Therefore, it is possible to make the cleaning interval of the air cleaning device relatively long.

Preferably, the fan of the present invention is a fan using a corona motor. In the corona motor, positive discharge electrodes and negative discharge electrodes are alternately arranged adjacent to the outer circumference of an insulating cylinder or disk rotating body, and a high DC voltage is applied to each discharge electrode to generate corona discharge. And supplying the generated positive and negative air ions to the surface of the rotating body to locally charge the surface of the rotating body positively and negatively, thereby forming static electricity between the rotating body and each discharge electrode. This is a device for rotating the rotating body by suction and repulsion by force. A corona motor using a rotating cylinder is called a cylindrical type, and a corona motor using a rotating disk is called a disk type. Either type of corona motor can be applied to the electrostatic air cleaning device of the present invention.

When the fan of the present invention is a fan using a corona motor, a DC high-voltage power supply used for the dust collecting function of the air cleaning device can be shared as a power supply for the corona motor. Also, when the corona motor generates negative ions by corona discharge, ozone is also generated, so that the ozone can deodorize the air.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a schematic configuration of an electrostatic air cleaning apparatus according to one embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. As shown in FIGS. 1 and 2, the electrostatic air cleaning device 1 according to the present embodiment includes four support columns 4 provided with a back panel 2 made of a flat insulating material and a front cover 3 at four corners. Joined to form a shell.

The apparatus 1 includes a dust collecting electrode 5 made of a flat metal plate adhered to substantially the center of the inner surface of the back panel 2;
It is erected on four support members 6 fixed to the front cover 4,
A discharge electrode 7 made of a thin metal wire arranged in a space facing the dust collecting electrode 5 so as to surround the outer periphery of the dust collecting electrode 5;
It has a positive output and a negative output, connects the positive output to the dust collection electrode 5, connects the negative output to the discharge electrode 7,
A DC high-voltage power supply 8 that generates corona discharge and a dust-collecting electrode 5 are provided so as to cover the dust-collecting electrode 5. When the particles charged by the corona discharge are attracted to the dust-collecting electrode 5, the charged particles are attached and collected. And a collecting member 9 made of dust collecting paper.

An opening is provided between the columns 4 on the outer peripheral side surface of the device 1, and this opening forms an air suction port 10. An air discharge port 11 is formed in the center of the front cover 3 at a position facing the center of the dust collection electrode 5. A fan 12 with a drive motor connected to a power supply (not shown) for discharging air toward the outside of the apparatus 1 is provided inside the air discharge port 11, and a finger guard 13 is provided outside the air discharge port 11. I have. In order to prevent the charged particles attracted to the dust collecting electrode 5 by the electrostatic force from being discharged from the discharge port 11 by the fan 12 before adhering to the collecting member 9, the blowing amount of the fan 12 and the fan 12 and the collecting member 9 Is set.

Next, the operation of the above embodiment will be described. When a negative high voltage is applied to the discharge electrode 7 and a positive high voltage is applied to the dust collection electrode 5 by the DC high-voltage power supply 8, the discharge electrode 7
, A negative corona discharge occurs. When a negative corona discharge occurs, negative air ions are generated, and the negative ions move toward the positive dust collection electrode 5 by electrostatic force. In response to the impact of the negative ions, dust particles such as smoke particles, pollen, mite droppings and the like existing in the air are negatively charged. The negatively charged particles move toward the dust collecting electrode 5 due to the electrostatic force of the electric field formed by the dust collecting electrode 5 and the discharge electrode 7 and adhere to the collecting member 9 covering the dust collecting electrode 5. And collected.

The movement of the charged particles causes the discharge electrode 7 to move.
, An air flow is formed toward the dust collecting electrode 5. here,
Since the discharge electrode 7 is arranged so as to surround the periphery outside the dust collecting electrode 5, the air flow is formed in a direction from the surrounding discharge electrode 7 to the central dust collecting electrode 5. And
An air inlet 10 is provided on the outer peripheral side of the device 1 located outside the discharge electrode 7, and an air outlet 11 is provided at the center of the front cover 3 of the device 1 facing the center of the dust collecting electrode 5. The air flow is formed so as to be sucked into the device 1 from an air suction port 10 opened on the outer peripheral side surface of the device 1 and discharged out of the device 1 from an air discharge port 11 opened at the front center of the device 1. You.

Further, air is forcibly discharged from the air discharge port 11 to the outside of the apparatus 1 by a fan 12 driven by a motor connected to a power supply (not shown). The air flow discharged from the outlet 11 is promoted. Accordingly, the air in the space is smoothly circulated, so that the air is smoothly sucked from the outer peripheral side surface of the device 1 and discharged from the front center.

As a result, the air in a wide space can be quickly removed from the device 1.
Since the particles are guided into the inside, the particles such as dust are charged by the corona discharge of the discharge electrode 7, and the charged particles are sucked by the dust collecting electrode 5 and attached to the collecting member 9 to be removed. It is possible to clean the air by removing dust and the like in the air.

Next, as another embodiment of the present invention, an electrostatic air purifier using a fan using a corona motor instead of the fan 12 of the electrostatic air purifier 1 shown in FIGS. 1 and 2 will be described. explain. FIG. 3 is a longitudinal sectional view of a corona motor,
FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is an explanatory perspective view for explaining the arrangement of the rotating cylinder and the discharge electrodes. The corona motor 14 shown in FIGS. 3 to 5 is applied to the air discharge port 11 instead of the fan 12 of the electrostatic air cleaning device 1 shown in FIGS. The description of the configuration common to that of the air purifier will be omitted.

As shown in FIGS. 3 to 5, the corona motor 14 includes a rotating cylinder 15 having an outer peripheral surface formed of an insulating material such as Teflon, and a blade integrally coaxially fixed inside the rotating cylinder 15. A plurality of positive and negative discharge electrodes 17 and 18 alternately arranged at equal intervals around the entire circumference in the circumferential direction facing the outer surface of the wheel 16 and the rotating cylinder 15; and a cylindrical shape around the discharge electrodes 17 and 18. And a case 21 made of an insulator having one end serving as a large-diameter suction port 19 and the other end serving as a small-diameter discharge port 20.
And A back cover 24 is provided in the suction port 19 of the case 21 and supports the bearing member 22 with a plurality of support rods 23 extending in the radial direction. The rotating cylinder 15 formed integrally with the impeller 16 is rotatably supported on the center shaft 25 of the impeller 16 by the bearing member 22.
7 and 18 are supported by a back cover 24 by a support member 26. The positive discharge electrode 17 is connected to a positive output of a DC high-voltage power supply (not shown) by a wiring (not shown), and the negative discharge electrode 18 is connected to a positive output of the DC high-voltage power supply. A conductive material 27 (for example, a metal plate, a metal foil, a coating of a conductive paint, or the like) is lined on the inner peripheral surface of the rotating cylinder 15, and the concentration of charges on the outer peripheral surface of the rotating cylinder 15 is improved. .

Next, the operation of the corona motor 14 will be described.
When a high DC voltage is applied to both of the discharge electrodes 17 and 18 by the DC high-voltage power supply, a positive corona discharge is generated at the positive discharge electrode 17 and a negative corona discharge is generated at the negative discharge electrode 18. Positive and negative air ions are generated by the positive and negative corona discharge, and the air ions are supplied to the outer peripheral surface of the rotary cylinder 15, and the entire circumferential direction of the outer peripheral surface of the rotary cylinder 15 alternates between positive and negative. Is charged. Thereby, the rotating cylinder 1
The rotating cylinder 15 rotates integrally with the impeller 16 due to the attractive force and the repulsive force of the static electricity between the discharge electrode 5 and the two discharge electrodes 17 and 18. By the rotation of the impeller 16, air is sucked from the suction port 19 and passes through the inside of the rotating cylinder 15 to discharge the air to the discharge port 2
An air flow ejected from zero is formed. Therefore, in the electrostatic air purifying apparatus 1 shown in FIGS. 1 and 2, if the corona motor 14 is used instead of the fan 12, air in a wide space can be quickly introduced into the apparatus 1, and a large space can be introduced. An air purifying apparatus for purifying air by removing dust and the like from the air can be provided.

A part of the air sucked from the suction port 19 is discharged from the discharge port 20 through the outside of the rotary cylinder 15, and here, the ozone is discharged together with the negative air ions by the negative corona discharge. Is generated. Therefore, if this corona motor 14 is used, an electrostatic air cleaning device having a deodorizing function with ozone can be provided.

The amount of ozone generated by the corona discharge of the corona motor 14 is proportional to the discharge current, and the rotation speed of the rotary cylinder 15 increases in proportion to the discharge current.
6 increases the air flow. Therefore, even if the amount of ozone generation increases or decreases due to the increase or decrease of the discharge current, the amount of air blown by the impeller 16 also increases or decreases at the same time, so that the ozone concentration in the case 21 is always maintained within a certain range. Therefore, the occurrence of a situation in which the ozone concentration is suddenly increased and a structure such as an insulator such as a plastic or a metal of the device is deteriorated is prevented, and the device has excellent durability while having a deodorizing function by ozone. An air purifier can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a schematic configuration of an electrostatic air cleaning device according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a longitudinal sectional view of a corona motor applied in place of the fan of the electrostatic air cleaning device of FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is an explanatory perspective view for explaining the arrangement of a rotating cylinder and discharge electrodes.

FIG. 6 is a schematic configuration diagram of a conventional filter-type air cleaning device.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a schematic configuration diagram of a conventional electrostatic air cleaning device.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;

[Explanation of symbols]

1. Electrostatic air cleaning device, 5. Dust collection electrode, 7.
・ Discharge electrode, 8 ・ ・ DC high voltage power supply, 9 ・ ・ Collecting member, 10 ・ ・ Air inlet, 11 ・ ・ Air outlet,
12. Fan, 13. Corona motor

Continued on the front page (72) Inventor Tatetoshi Tsuka 1-3-1 507 Namamugi, Tsurumi-ku, Yokohama-shi, Kanagawa F term (reference) 3L051 BC01 4D054 AA11 BA01 BA02 BB02 BB06 BB12 BC02 BC12 BC14 EA11

Claims (2)

[Claims] A DC high-voltage power supply; a discharge electrode for applying a negative or positive high voltage by the DC high-voltage power supply to perform corona discharge; and a corona discharge receiving the other high voltage by the DC high-voltage power supply. A dust collecting electrode that attracts particles charged by the discharge by electrostatic force, and provided so as to cover the dust collecting electrode;
A collecting member for adhering the charged particles attracted to the dust collecting electrode, wherein the discharge electrode is arranged around the planarly formed dust collecting electrode; An air inlet is provided around the outside of the
An air discharge port is provided at a position facing the center of the dust collecting electrode,
An electrostatic air cleaning device, wherein a fan is provided at the air discharge port for promoting an air flow sucked from the air suction port and discharged from the air discharge port. 2. The electrostatic air cleaning apparatus according to claim 1, wherein said fan is a fan using a corona motor.