JP2003126729A - Electric dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric dust collector which can easily remove particles captured by a dust collection electrode, and suppress lowering of the dust collection efficiency. SOLUTION: This electric dust collector 1 comprises a housing 10 having an air passage 9 to communicate an air inlet 7 with an air outlet 8, a suction fan 12 to generate an air flow W, a first discharge unit 13, a first dust collection unit 14, a second discharge unit 15, a second dust collection unit 16, a voltage supply unit 17 to supply the discharge voltage to generate corona discharge CD, and a drive motor to rotate a discharge electrode 4 and a dust collection electrode 5. The discharge units 13 and 15 comprise a discharge shaft 23, and a plurality of discharge electrodes 4, and are rotatably and pivotally supported. The dust collection units 14 and 16 comprise a dust collection shaft 28 and a plurality of dust collection electrodes 5 on the downstream side of the discharge units 13 and 15, and are rotatably and pivotally supported.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator, and more particularly to an electrostatic precipitator having rotatable dust collecting electrodes.

[0002]

2. Description of the Related Art Conventionally, before discharging so-called "industrial waste gas" such as soot and smoke emitted in large quantities from a boiler exhaust gas of a factory or a power plant into the atmosphere, various powders contained in the industrial waste gas are discharged. An air cleaning process may be performed to remove fine particles that may pollute the atmosphere, such as mist or dust containing body matter, oil or water. Since releasing industrial waste gas containing these fine particles directly into the atmosphere has a great impact on the global environment, it may be obliged to collect it according to the standards of the national and local governments. Further, in urban areas, air pollution due to vehicle exhaust gas is serious, and some households are equipped with indoor air purifiers and use them.

Many dust collectors are known for collecting fine particles contained in polluted air, which cause air pollution, and for purifying them into clean air because of differences in collection principle and the like. Specifically, when classified according to the principle of collecting fine particles, there are a filtration type, a gravity type, an inertia type, a centrifugal force type, an electric type, a washing type and the like. These are appropriately selected depending on the size and type of fine particles to be collected, installation conditions, and the like. Among them, in terms of dust collection performance,
Since the filter type (bag filter etc.) and the electric type are particularly excellent, they are widely used in various industrial fields.

Here, the collection principle of the electrostatic precipitator is that the particles are charged by the corona discharge generated from the discharge electrode, and the charged particles are used as a counter electrode by utilizing Coulomb force. It is electrically attracted to the electrodes and collected. The characteristics of this electrostatic precipitator have excellent advantages such as 1) small pressure loss, 2) treatment of a large amount of gas, and 3) high dust collection rate. Therefore, it is used in an environment where a large amount of polluted air is discharged, such as factories and power plants.

The main components of the electrostatic precipitator include a discharge electrode formed in a shape having a large surface curvature such as a needle or a wire that generates a corona discharge for giving an electric charge to fine particles, and charged fine particles as a counter electrode. A flat plate-shaped dust collecting electrode for collecting, a rectifying part for regulating the flow of air flow in the electrostatic precipitator, and a hammering device (dry type) or a spraying device for separating adhered fine particles from the dust collecting electrode. (Wet type), a hopper for collecting the separated fine particles, a power supply device for corona discharge as an auxiliary device, a charge control device, and the like.

The hammering device described above is used in a dry type electrostatic precipitator, and by hitting the dust collecting electrode with a hammer or the like, the collected fine particles are sieved and collected in a collecting portion such as a hopper provided below. It is used for. On the other hand, in the case of a wet method, the fine particles collected by the dust collecting electrode are washed away by spraying a cleaning liquid such as water. When a large amount of fine particles are collected by the dust collecting electrode, the Coulomb force that attracts the charged fine particles becomes weak, and the dust collecting efficiency may decrease. Therefore, in order to prevent dust from being unable to be collected in a stable state, fine particles are removed from the dust collecting electrode by the dry and wet methods described above.

On the other hand, in recent years, a type in which a discharge electrode and a dust collecting electrode are housed in a cartridge or the like and can be replaced is adopted. According to this, when a large amount of fine particles adhere to the dust collecting electrode and the dust collecting efficiency decreases, the dust collecting efficiency can be kept constant by replacing the cartridge. In addition, used cartridges are often reused after removal of fine particles by dedicated equipment installed in the manufacturer. As a result, the maintenance work of the device is facilitated, and since it is not necessary to provide the above-described removal equipment, the entire device can be downsized and the manufacturing cost can be reduced.

[0008]

However, as described above, the dry and wet electrostatic precipitators tend to be large in size, and the installation location is limited to a large factory or power plant. There were many On the other hand, in the case of the cartridge system, it is necessary to replace the cartridge each time the dust collection efficiency decreases, and in an environment in which a large amount of contaminated air is treated at one time, it is necessary to frequently perform such replacement work, which is labor intensive The burden and replacement cost increased, which was uneconomical.

In view of the above situation, the present invention has an object to provide an electrostatic precipitator capable of easily removing the fine particles collected by the dust collecting electrode and suppressing a decrease in dust collecting efficiency. is there.

[0010]

In order to solve the above problems, an electrostatic precipitator according to the invention of claim 1 discharges an intake port for sucking polluted air containing fine particles and clean air from which the fine particles are removed. A housing in which an air passage communicating with an exhaust port is formed, an air flow generating means for generating an air flow in the air passage, and a corona discharge that is provided in the air passage to generate the corona discharge to remove the fine particles in the air flow. A discharging means for charging, a collecting means provided in the air passage for collecting the fine particles charged by the discharging means using Coulomb force, and a discharge for supplying a discharge voltage capable of generating the corona discharge. In the electrostatic precipitator provided with a voltage supply means, the collecting means has a rod-shaped dust collecting shaft and a substantially disc shape, and has a dust collecting electrode attached to a peripheral surface of the dust collecting shaft. Equipped with a dust part The housing aligns the dust collecting shaft of the dust collecting portion in a direction substantially orthogonal to the air flow, bridges the dust collecting shaft in the air passage, and rotatably supports the dust collecting bearing portion, and the dust collecting bearing portion. And a dust collection driving unit that is connected to one end of the dust collection shaft pivotally supported by the dust bearing portion and rotates the dust collection electrode.

Here, the fine particles contained in the polluted air include industrial waste gas discharged from factories and the like, solid powdery substances contained in exhaust gas of vehicles, mist containing oil, water and the like. , Refers to suspended particulate matter suspended in the gas. These include those that have a great impact on the global environment, such as global warming, acid rain, and ozone layer depletion, when released directly into the atmosphere.

The airflow generating means is a means for generating an airflow in the air passage, and examples thereof include a suction fan connected to a conventionally known driving device such as a motor. In other words, it is possible to generate an air flow (air flow) by the rotating force of the propeller, and further control the amount of air to be sucked and the air flow speed by changing the size and rotation speed of the suction fan. It is possible.

Further, the collecting means is such that the discharging means gives an electric charge (for example, a negative electric charge) to the fine particles in the air flow, and the charged fine particles are collected by the Coulomb force at the counter electrode of the dust collecting electrode. It attracts and collects.

Therefore, according to the electrostatic precipitator of the first aspect of the present invention, the discharge voltage for generating the corona discharge is supplied to the discharge means by the discharge voltage supply means. Then, the generated corona discharge gives an electric charge to the fine particles contained in the air flow. In addition, generally, a negative charge is given to the fine particles by the corona discharge. Then, the charged fine particles are collected by the dust collecting electrode by the action of the Coulomb force. At this time, the dust collecting electrode is rotated by the dust collecting drive means. As a result, the fine particles collected by the dust collecting electrode are subjected to a centrifugal force directed from the dust collecting shaft toward the outer periphery due to the rotation. Therefore, when the centrifugal force becomes larger than the adsorption force of the fine particles collected by the dust collecting electrode, the fine particles separate from the dust collecting electrode. Therefore, a large amount of fine particles that reduce the action of the Coulomb force do not accumulate on the dust collecting electrode. Therefore, a stable action of the Coulomb force is received, and a decrease in the dust collection efficiency of the dust collection electrode can be suppressed.

An electrostatic precipitator according to a second aspect of the present invention is the electrostatic precipitator according to the first aspect, wherein the discharging means is
A discharge part having a rod-shaped discharge shaft and a plurality of discharge projections, and having a substantially disk-shaped discharge electrode attached to the peripheral surface of the discharge shaft is provided, and the air passage has an upstream side of the dust collecting part. The discharge shaft of the discharge unit is aligned with a direction substantially orthogonal to the air flow, and the discharge shaft is rotatably supported while being bridged in the air passage. A discharge driving means for rotating the discharge electrode, which is connected to one end of the discharge shaft supported by the shaft, is further provided.

Therefore, according to the electrostatic precipitator of the invention of claim 2, in addition to the function of the electrostatic precipitator of the invention of claim 1,
The discharge electrode that generates the corona discharge rotates. That is, since the location of the discharge protrusion of the discharge electrode changes due to rotation, corona discharge can be generated at any of the plurality of discharge protrusions. Therefore, corona discharge is not concentrated and generated from one place unlike the conventional case. Therefore, the discharge efficiency is increased, and since the locations where corona discharge is generated are dispersed, the life of the discharge electrode is extended.

An electrostatic precipitator according to a third aspect of the present invention is the electrostatic precipitator according to the first or second aspect, in which the plurality of the dust collecting electrodes of the dust collecting section mutually collect dust. The surfaces are opposed to each other and are attached to the peripheral surface of the dust collecting shaft at a predetermined interval.

Therefore, according to the electrostatic precipitator of the third aspect of the present invention, in addition to the function of the electrostatic precipitator of the first or second aspect of the invention, a plurality of dust collecting electrodes flow in the air passage. The contact area with the air flow containing the charged fine particles is increased, and the dust collection efficiency is increased.

An electrostatic precipitator according to a fourth aspect of the present invention is the electrostatic precipitator according to the second or third aspect, in which the discharge portion has a plurality of discharge electrodes facing each other. In this state, they are attached to the peripheral surface of the discharge shaft at a predetermined interval, and at least one surface of the discharge surface is in close proximity to the dust collecting surface while maintaining substantially parallel thereto.

Therefore, according to the electrostatic precipitator of the fourth aspect of the invention, in addition to the function of the electrostatic precipitator of the second or third aspect of the invention, a plurality of discharge electrodes can be used to prevent the corona discharge from occurring. It becomes possible to increase the number, and the discharge efficiency for charging the particles increases. In addition, since the dust collecting surface and at least one surface are arranged in a state of being substantially parallel and close to each other, an electric field is formed between both electrodes, and it becomes easier to collect charged fine particles.

An electrostatic precipitator according to a fifth aspect of the present invention is the electrostatic precipitator according to any one of the second to fourth aspects, in which the discharge bearing portion and the discharge voltage supply means are electrically connected to each other. The discharge electrodes, and the discharge voltage capable of generating the corona discharge is supplied to the discharge electrode through the bearing of the discharge bearing portion.

Therefore, according to the electrostatic precipitator of the invention of claim 5, in addition to the function of the electrostatic precipitator of the invention of any one of claims 2 to 4, it is electrically connected to the discharge bearing portion. The discharge voltage required for corona discharge is supplied to the discharge electrode of the discharge electrode through the bearing by the discharge voltage supply means. As a result, the discharge voltage can be supplied even when the discharge electrode is rotating, and the rotation is not hindered.

An electrostatic precipitator according to a sixth aspect of the present invention is the electrostatic precipitator according to any one of the second to fifth aspects, wherein a plurality of the discharge parts and the collector are provided in the air passage. The dust parts are alternately arranged, and the upstream discharge part arranged on the upstream side of the air passage generates the corona discharge by the discharge voltage higher than that of the downstream discharge part provided on the downstream side. Is.

Therefore, according to the electrostatic precipitator of the invention of claim 6, in addition to the operation of the electrostatic precipitator of the invention of any one of claims 2 to 5, the dust collecting part and the discharging part are air-cooled. It is provided alternately in the passage. As a result, the charging and collecting of the fine particles are repeated at a plurality of points in the air passage, so that the fine particles can be collected more reliably. further,
The discharge voltage supplied to the upstream discharge unit provided on the upstream side is set higher than that supplied to the downstream discharge unit. Therefore, by changing the generation condition of the corona discharge, it becomes possible to charge the fine particles that have not been collected on the upstream side and reliably collect them, and the dust collection efficiency of the entire electrostatic precipitator increases.

An electrostatic precipitator according to the invention of claim 7 is the electrostatic precipitator according to any one of claims 1 to 6, wherein the electrostatic precipitator is provided in the air passage and is provided on the dust collecting surface. An arm portion having a wiping portion at its tip for abutting and collecting the collected fine particles, and one end of the arm portion are pivotally supported to maintain the contact state between the dust collecting surface and the wiping portion. Meanwhile, a wiper having an arm shaft portion for rotating the arm portion is further provided.

Therefore, according to the electrostatic precipitator of the invention of claim 7, in addition to the action of the electrostatic precipitator of the invention of any one of claims 1 to 6, dust is collected by the wiping portion of the wiper. It becomes possible to mechanically remove the fine particles collected on the surface. This makes it possible to reliably remove the fine particles remaining on the dust collecting surface without being scattered by the centrifugal force. In addition,
It is preferable that one wiper is provided for each dust collecting surface of the dust collecting electrode provided in the air passage. Also,
When rotating the wiper to remove fine particles, it is desirable to rotate the dust collecting electrode without generating corona discharge. Further, the above-mentioned wet electrostatic precipitator may be provided with an ejecting unit, and the wiper may be operated while ejecting onto the dust collecting surface.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An electrostatic precipitator 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is an explanatory view schematically showing an arrangement configuration of a discharge unit 2 and a dust collecting unit 3 in an electrostatic precipitator 1 according to an embodiment of the present invention from above, and FIG. It is explanatory drawing which shows the arrangement | positioning structure of the electrode 4 and the dust collection electrode 5 typically from a side, FIG. 3 is explanatory drawing which shows a) the discharge electrode 4, and b) the shape of another example, FIG. Voltage / drive control unit 6
It is a side view which shows the structure of FIG.

An electrostatic precipitator 1 according to an embodiment of the present invention
As shown in FIGS. 1 and 2, a housing having an air passage 9 formed therein, which communicates with an intake port 7 for sucking in polluted air D containing fine particles P and an exhaust port 8 for discharging purified clean air F. 10, a suction fan 12 for sucking the contaminated air D from the intake port 7 and generating an air flow W in the air passage 9 by the rotation of the rotary fan unit 11 for discharging the clean air F from the exhaust port 8, and an air passage First discharge section 13, first dust collecting section 14, second discharge section 15, and second dust collecting section which are alternately arranged from the upstream side (corresponding to the right side of the paper in FIGS. 1 and 2) in 9 16 and housing 10
A voltage supply unit 17 for supplying a discharge voltage for generating a corona discharge CD, and a discharge unit 2
The drive motor 18 that rotationally drives the discharge electrode 4 and the dust collecting electrode 5 of the dust collecting portion 3, and the voltage / drive control portion 6 that includes the drive belt 19 that transmits the rotation of the drive motor 18 in synchronization with each other. Is configured. Here, the suction fan 12 corresponds to the airflow generating means in the present invention, and the voltage supply unit 17 corresponds to the discharge voltage supplying means in the present invention.

Further, a concrete structure will be described. A filter portion 20 is provided in the air passage 9 in the vicinity of the intake port 7 and physically filters and removes large contaminants.
Then, as described above, the first discharge part 13, the first dust collection part 14, the second discharge part 15, and the second dust collection part 16 are alternately installed from the upstream side. Here, in the first discharge portion 13 and the second discharge portion 15, the discharge shaft 23 is mounted on the discharge bearing portions 21 and 22 formed on both side surfaces of the housing 10 so as to be substantially orthogonal to the air flow W. It is passed and is rotatably supported. Then, the discharge electrodes 4 having the discharge protrusions 24 in the shape of protrusions that generate the corona discharge CD are formed on the peripheral surface of the discharge shaft 23 at a predetermined interval with the discharge surfaces 25 facing each other. The reason will be described later,
The distance between the discharge electrodes 4 of the first discharge portion 13 is set to be wider than the distance between the discharge electrodes 4 of the second discharge portion 15, so that the number of discharge electrodes 4 attached to the discharge shaft 23 also differs. Specifically, the first discharge part 13 is provided with seven discharge electrodes 4, while the second discharge part 15 is provided with 14 discharge electrodes 4.
Is provided.

On the other hand, the first dust collecting portion 14 and the second dust collecting portion 16
The dust collecting shaft 28 is bridged over the dust collecting bearing portions 26 and 27 formed on both side surfaces on the downstream side of the discharge portions 13 and 15 of the housing 10 so as to be substantially orthogonal to the air flow W. , Is rotatably supported. And corona discharge C
Dust collecting surfaces 29 of the dust collecting electrode 5 for collecting the fine particles P charged by D are formed on the circumferential surface of the dust collecting shaft 28 while facing each other at a predetermined interval. As shown in FIGS. 1 and 2, at least one discharge electrode 4 is inserted between the dust collecting electrodes 5 facing each other in a substantially parallel manner. In other words, at least a part of the discharge electrode 4 of the discharge part 2 and the dust collecting electrode 5 of the dust collecting part 3 are in a state of overlapping each other. Further, similarly to the interval between the discharge electrodes 4 of the first discharge unit 13 described above, the interval between the dust collecting electrodes 5 of the first dust collecting unit 14 is wider than the interval between the dust collecting electrodes 5 of the second dust collecting unit 16. The number of dust collecting electrodes 5 set and attached to the dust collecting shaft 28 is also different. Specifically, the first dust collecting portion 14 is provided with eight dust collecting electrodes 5, while the second dust collecting portion 16 is provided with fifteen dust collecting electrodes 5.

This is because the magnitudes of the discharge voltages supplied to the first discharge section 13 and the second discharge section 15 by the voltage supply section 17 are different. Here, in the present embodiment, the discharge voltage supplied to the first discharge unit 13 is 12
The discharge voltage supplied to the second discharge unit 15 is set to 6 kV. The dust collection efficiency of the fine particles P largely depends on the supplied discharge voltage and the interval of the electric field formed between the electrodes (that is, between the discharge electrode 4 and the dust collection electrode 5).

Therefore, the distance between the discharge electrode 4 of the first discharge section 13 to which a high discharge voltage (12 kV) is supplied and the dust collection electrode 5 of the first dust collection section 14 is equal to the charge given to the fine particles P. Since the amount is large, it can be set relatively wide. On the other hand, the distance between the discharge electrode 4 of the second discharge part 15 and the dust collection electrode 5 of the second dust collection part 16 to which a low discharge voltage (6 kV) is supplied is set to the above-mentioned distance in order to ensure the collection. It is necessary to set it smaller than the specified interval. Therefore, as shown in FIG. 1, the intervals between the discharge electrode 4 and the dust collecting electrode 5 of the second discharge portion 15 and the second dust collecting portion 16 installed on the downstream side are the same as those of the first discharge portion 13 and the second discharge portion 15. It is set to be narrower than the case of the dust collecting unit 14. The numerical values of the discharge voltage exemplified in this embodiment (12 kV and 6 kV)
Needless to say, it is not particularly limited and can be appropriately set according to the fine particles P to be collected.

Further, the first discharge section 13 and the second discharge section 15
As shown in FIG. 4, the discharge bearing portion 21 that axially supports each of the discharge shafts 23 on the voltage / drive control portion 6 side is electrically connected to the voltage supply portion 17 by the discharge side wiring cord 30. At this time, the discharge bearing portion 21 and the housing 10 are electrically insulated by an insulating material such as ceramic. Further, the discharge side wiring cord 30 is connected to the bearing 31 of the discharge bearing portion 21, and the voltage supply portion 1
A discharge voltage is supplied from 7 to the discharge shaft 23 and the discharge electrode 4. The discharge bearing portion 22 arranged on the other side is also made of an insulating material and is electrically insulated from the housing 10. That is, the discharge voltage supplied through the bearing 31 is discharged from the discharge protrusion 24 of the discharge electrode 4. In the present embodiment,
A negative charge is applied from the voltage supply unit 17 to the discharge electrode 4.

On the other hand, the first dust collecting portion 14 and the second dust collecting portion 16
The dust collecting electrode 5 is electrically connected through the housing 10 connected to the housing side wiring cord 33 extending from the voltage supply unit 17, and the housing 10 and the dust collecting unit 14,
16 is relatively positively charged. Further, the housing 10 is provided with a ground (not shown).
As a result, the corona discharge CD generated from the discharge electrode 4 causes the fine particles P to be negatively charged. After that, it is collected by the Coulomb force on the dust collecting electrode 5 of the counter electrode. The negative charge of the fine particles P collected by the ground escapes to the ground surface or the like, so that the charge is not accumulated in the electrostatic precipitator 1.

Further, since the discharge electrode 4 has a property that the corona discharge CD is more likely to be discharged from the portion having the projection than the flat surface, it has a substantially disc shape as shown in FIG. 2 or 3.
The discharge protrusion 24 has a notch on its outer periphery or a plurality of protrusions formed by hollowing out the discharge surface 25. These shapes are the conditions for generating the corona discharge CD (discharge voltage,
It can be appropriately selected depending on the fine particles to be collected). 3A and 3B show another example of the shape.

Further, as shown in FIG. 4, in the electrostatic precipitator 1 of this embodiment, the voltage / drive control unit 6 is provided with the first discharge unit 1.
3, a drive motor 18 for rotating the discharge shaft 23 and the dust collection shaft 28 of each of the first dust collection unit 14, the second discharge unit 15, and the second dust collection unit 16, and the drive shaft 4 of the drive motor 18.
5 and the respective shafts 23 and 28, and has a drive belt 19 for synchronously transmitting the rotation of the drive motor 18. It should be noted that tension rollers 32 are provided at two positions of the drive belt 19 to apply tension to the drive belt 19 so that stable rotation can be transmitted. A connecting roller 35 having a belt groove 34 at the tip of each of the shafts 23 and 28 so that the connection with the drive belt 19 is not lost.
a and 35b are provided. As a result, the rotation of one drive motor 18 transmits the rotation to all of the four shafts 23 and 28. Here, the drive motor 18, the drive belt 19, the tension roller 32, and the connection roller 3
5a and 35b correspond to the dust collection driving means and the discharge driving means in the present invention.

Further, the electrostatic precipitator 1 of this embodiment is provided with the wiper 36 for mechanically removing the fine particles P trapped in the dust collecting surface 29 of the dust collecting electrode 5 in the air passage 9. There is. Specifically, as shown in FIG. 2, the dust collecting surface 29 is provided at the end.
Arm part 38 having a wiping part 37 for contacting with and wiping the fine particles P, and one end of the arm part 38 is rotatably supported, while maintaining the contact state between the dust collecting surface 29 and the wiping part 36. And an arm shaft portion 39 for rotating the. The wiper 36 is installed for each of the dust collecting electrodes 5 installed in the air passage 9. Therefore, the arm shaft portion 39 is formed continuously in the direction of the dust collecting shaft 28,
All the arm parts 38 can be interlocked. Note that the configuration of the wiper 36 is omitted in FIG. 1 to simplify the drawing.

As shown in FIG. 2 or 4, the wiper 36 has the first dust collecting portion 14 formed in the air passage 9.
And a connecting member 40 for connecting the front and rear wipers 36 of the second dust collecting portion 16, a connecting support portion 43 having a connecting shaft 41 and a support shaft 42 for rotatably supporting the connecting member 40, and a connecting support portion 43. The voltage / drive control unit 6 further includes a rotation support portion 44 that rotatably supports the rotation. Thereby, the movement of the front and rear wipers 36 in the first dust collecting portion 14 and the second dust collecting portion 16 can be interlocked. A wiper drive means (not shown) such as a motor according to a conventionally known technique is provided in the housing 10, and the wiper 36 is driven using the wiper drive means.

Next, a method of using the electrostatic precipitator 1 of this embodiment will be described. First, the suction fan 12 is started. Then, by driving the drive motor 18,
The electrodes 4 of the discharge parts 13, 15 and the dust collecting parts 14, 16
Rotate 5. Due to the rotation of the rotary fan unit 11 of the suction fan 12, an airflow W is generated in the air passage 9 and the intake port 7
After the filter unit 20 removes large contaminants from the air, contaminated air D containing fine particles P such as fine mist that cannot be removed by the filter unit 20 is sucked into the air passage 9. Then, the contaminated air D containing the fine particles P flows into the first discharge part 13 installed on the most upstream side in the air passage 9 as the air flow W.
Get on and approach. At this time, the discharge electrode 4 of the first discharge part 13
The rotation of the drive motor 18 is transmitted to the discharge shaft 23 via the drive belt 19 and therefore rotates in the direction of the arrow in FIG.

Then, the discharge electrode 4 rides on the generated air flow W.
The fine particles P that have reached the vicinity of the
It is negatively charged by the corona discharge CD generated from. On the other hand, since the dust-collecting electrode 5 which is the opposite electrode of the discharge electrode 4 is relatively positively charged, the negatively-charged fine particles P are attracted to the dust-collecting electrode 5 by the action of the Coulomb force and the dust is collected. Collected on surface 29. As a result, the fine particles P containing fine mist and the like can be removed from the contaminated air D and purified into clean air F. Further, as described above, since the entire housing 10 is relatively positively charged, the charged fine particles P can be collected on the inner peripheral surface of the air passage 9.

At this time, the discharge electrode 4 of the first discharge section 13 is
A predetermined rotation speed (for example, 500
rpm). Therefore, the corona discharge CD is generated while rotating from each of the discharge protrusions 24 provided on the discharge electrode 4. Therefore, the discharge efficiency is improved and the life of the discharge electrode 4 can be extended.

Further, the fine particles P collected on the dust collecting electrode 5
Indicates that the dust collecting electrode 5 has the same number of revolutions (500 rpm) as the discharge electrode 4.
Since it is rotating at, it is subjected to a centrifugal force acting from the dust collecting shaft 28 toward the outer peripheral direction. That is, the collected fine particles P
Is applied to the outer circumference of the dust collecting electrode 5. At this time, the fine particles P repeatedly aggregate with other fine particles and mist in the surroundings to become relatively large particles having an increased weight. When the centrifugal force is resisted by the suction force of the fine particles P on the dust collecting surface 29, the fine particles P are scattered into the air flow W again from the dust collecting electrode 5. At this time, since the size and weight of the fine particles P are increased as compared with the state before being collected as described above, it becomes difficult to suspend the air flow W, and falls downward due to gravity. In the present embodiment,
Although not shown, a collection part such as a hopper and an oil pan for collecting the fine particles P reaching the bottom is provided with an air passage 9
May be provided on the bottom surface of the.

In addition, in the electrostatic precipitator 1 of the present embodiment, the fine particles P which could not be collected in the first dust collecting section 14 are re-collected in the second discharging section 15 provided further downstream. The particles P can be charged and the fine particles P can be collected stepwise by the second dust collecting portion 16. The clean air F from which the fine particles P have been removed is discharged from the exhaust port 8. In the present embodiment, two discharge units 2 and two dust collecting units 3 are alternately installed, but the number of installations is not particularly limited, and the characteristics of the fine particles to be collected are not limited. It can also be installed at one or three or more locations depending on the collection conditions.

As described above, according to the electrostatic precipitator 1 of this embodiment, the fine particles P collected on the dust collecting electrode 5 can be scattered from the dust collecting surface 29 by utilizing the centrifugal force. it can. Therefore, the removal work related to the operation of the electrostatic precipitator 1 can be performed at the same time. That is, it is possible to prevent the dust collection efficiency from being lowered due to the weakening of the action of the Coulomb force by collecting and accumulating the fine particles on the dust collection surface as in the conventional case. As a result, the operation can be performed in a state where the dust collection efficiency is stable for a long time, and the cartridge replacement work which has been conventionally required can be omitted. Therefore, the work load and the replacement cost can be reduced.

Further, by rotating the discharge electrode 4, corona discharge CD can be generated from a plurality of locations of the formed discharge protrusion 24. As a result, the life of the discharge electrode 4 is extended and good discharge efficiency can be obtained. Further, by disposing a plurality of discharge electrodes 4 and dust collecting electrodes 5 in the air passage 9 in the front-rear direction and the left-right direction, respectively, it is possible to increase the collecting area and the location where the corona discharge CD is generated, and thus the collecting electrode as a whole is collected. Increases dust efficiency.

In addition, the electrostatic precipitator 1 of this embodiment is provided with a wiper 36 capable of mechanically removing the fine particles P adhering to the dust collecting surface 29. As a result, it is possible to remove the fine particles P by utilizing the centrifugal force and mechanically remove them. As a result, it is possible to further suppress the decrease in dust collection efficiency. In addition, the removal operation using the wiper 36 is performed after the operation of the electrostatic precipitator 1 and the corona discharge CD is discharged to the discharge electrode 4.
It is desirable to rotate the dust collecting electrode 5 in a state where it is not generated.

The present invention has been described above with reference to the preferred embodiments, but the present invention is not limited to these embodiments, and as shown below, within the scope of the present invention, Various improvements and design changes are possible.

That is, although the discharge electrode 4 and the dust collecting electrode 5 are rotated at the same number of revolutions by the drive motor 18 and the drive belt 19, the present invention is not limited to this. May be different. Alternatively, a plurality of drive motors may be provided and rotated independently.

Further, the supplied discharge voltage is applied to each discharge unit 1.
Although the value changed every 3 and 15 is shown, it is not limited to this and the same value may be used. Furthermore, the numerical values (12 kV, 6 kV) of the discharge voltage in each of the discharge units 13 and 15 illustrated in this embodiment can be changed. Further, although the discharge unit 2 and the dust collecting unit 3 are linearly arranged along the air passage 9, they may be arranged in a curved shape or the like according to the shape of the air passage 9.

Further, equipment for removing the fine particles P collected by spraying a cleaning liquid such as water used in the conventional wet type electrostatic precipitator on the dust collecting surface 29 is further provided.
Can also be ensured.

[0051]

As described above, in the electrostatic precipitator according to the first aspect of the present invention, the collected fine particles can be scattered by the centrifugal force by rotating the dust collecting electrode. This allows
It is possible to prevent the dust collection efficiency from being lowered due to the particles collected and accumulated by the dust collection electrode. That is, it is possible to remove fine particles simultaneously with the operation of the electrostatic precipitator with a simple structure.

The electrostatic precipitator of the invention of claim 2 is the same as that of claim 1.
In addition to the effect of the electrostatic precipitator of the invention of claim 1, by rotating the discharge electrode, the location where corona discharge occurs is not biased to one location, discharge efficiency improves, and the life of the discharge electrode can be extended. . And, it leads to an increase in the dust collection efficiency as a whole.

The electrostatic precipitator of the invention of claim 3 is the same as that of claim 1.
Alternatively, in addition to the effect of the electrostatic precipitator according to the second aspect of the present invention, by providing a plurality of dust collecting electrodes, the collection area of fine particles is increased. Therefore, the dust collection efficiency is improved.

The electrostatic precipitator of the invention of claim 4 is the same as that of claim 2.
Alternatively, in addition to the effect of the electrostatic precipitator according to the third aspect of the invention, by providing a plurality of discharge electrodes, corona discharge can be generated from a plurality of locations. Therefore, the probability that the fine particles are charged increases, and therefore the dust collection efficiency increases.

The electrostatic precipitator of the invention of claim 5 is the same as that of claim 2.
In addition to the effect of the electrostatic precipitator according to any one of claims 4 to 4, since the discharge voltage is supplied through the bearing, the rotation of the discharge electrode is not hindered.

The electrostatic precipitator of the invention of claim 6 is the same as that of claim 2.
In addition to the effect of the electrostatic precipitator of the invention according to any one of claims 5 to 5, by providing a plurality of discharge parts and dust collecting parts alternately, it is possible to collect fine particles in a stepwise manner. The dust collection efficiency can be improved. Further, by setting the discharge voltage in each discharge unit to be different and changing the charging condition and the collecting condition, it is possible to collect many fine particles.

The electrostatic precipitator of the invention of claim 7 is the same as that of claim 1.
In addition to the effect of the electrostatic precipitator according to any one of claims 6 to 6, a wiper is provided, and the fine particles trapped on the dust collecting surface can be mechanically removed.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing a configuration from above of an electrostatic precipitator according to an embodiment.

FIG. 2 is an explanatory diagram schematically showing the configuration of the electrostatic precipitator of one embodiment from the side.

FIG. 3 is an explanatory diagram showing shapes of another example of the discharge electrode (a) and the discharge electrode (b).

FIG. 4 is an explanatory diagram schematically showing the configuration of a voltage / drive control unit.

[Explanation of symbols]

1 Electric dust collector 2 Discharge part 3 Dust collector 4 discharge electrodes 5 Dust collecting electrode 7 Intake port 8 exhaust port 9 air passages 10 housing 11 Rotating fan section 12 Suction fan (air flow generation means) 13 First discharge part (discharge part) 14 First dust collecting part (dust collecting part) 15 Second discharge part (discharge part) 16 Second dust collecting part (dust collecting part) 17 Voltage supply unit (discharge voltage supply means) 18 Drive motor (dust collection drive means, discharge drive means) 19 Drive belt (dust collection drive means, discharge drive means) 21,22 Discharge bearing 23 Discharge axis 24 Discharge protrusion 25 discharge surface 26, 27 Dust collection bearing 28 Dust collecting shaft 29 Dust collection surface 31 bearing 36 wiper 37 Wiping part 38 Arm 39 Arm shaft D Contaminated air F clean air P fine particles W airflow

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B03C 3/41 B03C 3/41 H 3/45 3/45 A 3/47 3/47 3/66 3 / 66 3/74 3/74 A

Claims (7)

[Claims] 1. A housing in which an air passage communicating with an intake port for sucking polluted air containing fine particles and an exhaust port for discharging clean air from which the fine particles are removed is formed, and an air flow is generated in the air passage. An air flow generating means, a discharge means provided in the air passage for generating a corona discharge to charge the fine particles in the air flow, and a fine particle charged in the air passage for being charged by the discharge means in a coulomb In an electrostatic precipitator comprising a collecting means for collecting by utilizing force and a discharge voltage supplying means for supplying a discharge voltage capable of generating the corona discharge, the collecting means is a rod-shaped dust collecting shaft. , And a substantially disk shape, and a dust collecting part having a dust collecting electrode attached to a peripheral surface of the dust collecting shaft, wherein the housing has the dust collecting shaft of the dust collecting part with respect to the air flow. Almost orthogonal The dust collecting electrode is connected to one end of the dust collecting shaft that is rotatably supported and rotatably supported while being aligned with the dust collecting electrode. An electrostatic precipitator comprising: a dust collector driving means for rotating the electric precipitator. 2. The discharge means includes a discharge portion having a rod-shaped discharge shaft, a plurality of discharge protrusions, and a discharge electrode having a substantially disc shape attached to a peripheral surface of the discharge shaft. The discharge passage is provided on the upstream side of the dust collecting portion in the air passage, the discharge axis of the discharge portion is aligned with a direction substantially orthogonal to the airflow, and the discharge passage is bridged in the air passage and rotatably supported. The electric collector according to claim 1, further comprising: a discharge bearing unit, and a discharge driving unit that is connected to one end of the discharge shaft pivotally supported by the discharge bearing unit and rotates the discharge electrode. Duster. 3. The dust collecting portion is characterized in that a plurality of the dust collecting electrodes are attached to a peripheral surface of the dust collecting shaft at a predetermined interval with their dust collecting surfaces facing each other. The electrostatic precipitator according to claim 1 or 2. 4. The discharge part is mounted on the peripheral surface of the discharge shaft with a plurality of the discharge electrodes, the discharge electrodes facing each other at a predetermined interval, and at least one surface of the discharge surfaces. 5. The electrostatic precipitator according to claim 2 or 3, wherein the electrostatic precipitator is close to the dust collecting surface while being substantially parallel to the dust collecting surface. 5. The discharge bearing part is electrically connected to the discharge voltage supply means, and supplies the discharge voltage capable of generating the corona discharge to the discharge electrode through a bearing of the discharge bearing part. The electrostatic precipitator according to any one of claims 2 to 4. 6. The plurality of discharge parts and the dust collecting parts are alternately arranged in the air passage, and the upstream discharge part arranged on the upstream side of the air passage is provided on the downstream side. The electrostatic precipitator according to any one of claims 2 to 5, wherein the corona discharge is generated by the discharge voltage higher than that of the downstream discharge unit. 7. An arm portion provided in the air passage, which has a wiping portion for abutting the dust collecting surface and for wiping off the collected fine particles, and one end of the arm portion is pivotally supported. ,
7. The wiper having an arm shaft portion for rotating the arm portion while maintaining the contact state between the dust collecting surface and the wiping portion, further comprising: One of the electric dust collectors.