JP2503839Y2 - Exhaust gas purification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an exhaust gas purifying apparatus for cleaning automobile exhaust gas by corona discharge, and particularly, to generate a paying corona discharge stably for a long period of time. The present invention relates to an exhaust gas purifying device having a blower corona generating unit.

[Prior Art] Conventionally, as this kind of technology, there is one disclosed in Japanese Patent Laid-Open No. 57-20510. According to the related art,
It is composed of a corrugated cylindrical dust collecting cylinder and a desired number of discharge lines stretched in the hollow portion of the cylindrical dust collecting cylinder. For example, fine particles such as tar particles and graphite have been removed. That is, fine particles floating in the exhaust gas are sucked and adhered to the inner wall of the dust collecting cylinder by the action of the strong electrostatic field generated between the cylindrical dust collecting cylinder and the discharge line to remove the dust.

[Problems to be Solved by the Invention] However, according to the above-mentioned conventional technique, there is a risk that the discharge wire is broken when a spark discharge occurs between the dust collecting tube and the discharge wire.

Further, the suction adhesion was weak and insufficient to remove harmful gases such as NOx and COx in the exhaust gas.

Corona discharge has recently been considered as an effective discharge generation mode for activating and removing such harmful gases.However, in a general corona discharge phenomenon, the suction force of dust and the like contained in the exhaust gas is not sufficient. We could not secure the value of the period.

Therefore, it is necessary to generate a peculiar corona, that is, a payoff corona in order to put into practical use the technique of removing harmful gas by the corona discharge, and it is necessary to secure an increase in the occurrence of payoff corona.

Further, in order to stably generate the payout corona for a long period of time, it is necessary to eliminate the influence of adhesion of carbonized particles or the like on the occurrence of the payoff corona.

[Means for Solving the Problems] The present invention has been devised in view of the above-mentioned problems, and includes a first electrode made of a threaded conductor and the first electrode.
Second electrode made of a conductor disposed so as to face the electrode, the insulating portion attached to at least the surface of the second electrode on the first electrode side, the first electrode and the second electrode. A viscous oil is generated in the atmosphere of the brush corona generating portion that is formed in the brush corona generating portion to form a viscous oil film on the surface of the insulating portion that is on the side of the first electrode. Provided is an injection means for injecting, and a circulation means for circulating viscous oil flowing out from the payout corona generating part to the injection means side, to provide a stable maintenance of the payoff corona. The purpose is to purify the exhaust gas over a long period of time as it is generated by the paying corona.

[Operation] The exhaust gas purifying apparatus according to the present invention having the above-described configuration operates as follows.

First, when a high voltage is applied between the first electrode and the second electrode made of a thread-shaped conductor in the brush corona generating portion, the insulating portion and the first electrode that adhere to the inner surface portion of the second electrode The pay-off corona is generated between the first electrode and the first electrode.

This state is shown in FIGS. 4 to 6, which will be described below.

FIG. 4 shows a state in which a high voltage power source 4 applies a positive voltage to the first electrode 1 and a negative voltage to the second electrode 2.

The arrow indicated by EO in FIG. 4 indicates the direction of the electric field generated by the high voltage applied between the first electrode 1 and the second electrode 2, and the arrow indicated by ES is covered by the viscous oil film 5a. The direction of the reverse electric field generated by the charge accumulated on the surface of the insulating portion 3 is shown, P indicates the positive charge accumulated on the surface of the insulating portion 3, C1 indicates the positive corona, and here the positive corona is the most Shows the grown Fusuko Corona.

In the state shown in FIG. 4, the payoff corona C1 is generated and the positive charge P is accumulated on the surface of the insulating portion 3, and the reverse electric field ES increases in accordance with the amount of the plus charge P to suppress the payoff corona C1. , The brush corona C1 changes and decays to a brush corona or a film corona that occurs only in the vicinity of the first electrode 1 with the passage of time.

This change attenuation phenomenon of the payout corona C1 is caused because the accumulated amount of the positive charge P becomes too large.
By taking measures to reduce this excess positive charge P, the payer corona C1 increases and grows.

In this invention, the generation of the payout corona C1 is ensured by neutralizing and reducing the excessive positive charge P through the steps shown in FIGS. 5 and 6 which will be described later.

FIG. 5 shows a so-called zero state in which the polarity of the output of the high voltage power source 4 is switched. In the state shown in FIG. 5, the generation of corona is temporarily stopped.

FIG. 6 shows the opposite polarity to the state shown in FIG.
A negative voltage is applied to the first electrode 1 by the high voltage power source 4,
A state where a positive voltage is applied to the second electrode 2 is shown.

In FIG. 6, e represents an electron and C2 represents a negative corona.

In the state shown in FIG. 6, the negative electrode corona C2 and the electron e are generated from the first electrode 1, and the electron e is combined with the positive charge P accumulated on the surface of the insulating portion 3 and neutralized.

As a result, the excess positive charge P is reduced, and when the state again shown in FIG. 4 is reached, the paying corona C1 is generated again.

As described above, in the brush corona generating portion, the brush corona C1 is continuously generated by repeating the states shown in FIGS. 4 to 6, but carbon particles or the like adhere to the insulating portion 3 and the surface of the insulating portion 3 When unevenness occurs in the wire, the brush corona C1 disappears and a spark discharge starts. However, in this invention, the viscous oil 5 circulated by the circulation means is injected into the brush corona generating portion by the injection means, for example, an oiling pipe, and the surface of the insulating portion 3 is always smoothed by the viscous oil film 5a. There is. Therefore, the payout corona generating unit 6 stably generates the payout corona C1 for a long period of time.

Then, when the exhaust gas is ventilated through the payout corona generating part 6, the ionized harmful gas in the exhaust gas is sucked into the inner wall of the payoff corona generating part, and the exhaust gas is cleaned.

[Embodiment] FIGS. 1 to 3 are views showing a preferred embodiment of the present invention.

This example illustrates an example configured to purify harmful gases in the exhaust gas of motor vehicles.

FIG. 1 is a vertical sectional view showing an entire exhaust gas purifying apparatus A according to the present invention formed in an exhaust gas pipe.

In the figure, reference numeral 6 denotes a brush corona generating portion that generates a brush corona C1 by applying a high voltage power source 4, and includes a first electrode 1, a second electrode 2, an insulating portion 3, a high voltage power source 4, and a supporting portion. It is composed of 7.

More specifically, the first electrode 1 is made of a threaded conductor, for example, a stainless rod processed into a threaded shape. For the processing of the threaded shape, a method performed using a cutting machine such as a milling machine or a method performed using a die processing machine such as sintering may be appropriately selected. Then, by changing the thread pitch of the thread cutting, a convex portion having a triangular sectional shape or a convex portion having a trapezoidal sectional shape is formed on the surface of the first electrode 1.

Next, the first electrode 1 is supported by the supporting portion 7 made of an insulating material at the center of the insulating portion 3 made of a material such as ceramics formed in a cylindrical shape.

Then, the second electrode 2 is deposited on the outside of the insulating portion 3.

The second electrode 2 is formed, for example, by printing a metal paste on the surface of the insulating portion 3 such as ceramics and firing the paste. Alternatively, the second electrode 2 is prepared in advance with a metal pipe, and then the surface of the second electrode 2 is enameled with organic glass or the like to form the insulating portion 3. Further, it may be a simple combination of an insulating pipe and a metal pipe.

The first electrode 1 and the second electrode made of the threaded conductor
Each of the electrodes 2 is electrically connected to a high voltage power source 4. The high-voltage power supply 4 is a circuit for generating a high voltage of positive and negative polarities at a certain frequency, and its waveform may be any of a sine wave and a pulse wave.

The above-mentioned frequency is a constant frequency or a frequency synchronized with the engine speed such as the ignition coil output.

Next, in FIG. 1, reference numeral 8 indicates the first portion of the insulating portion 3.
It is an oiling pipe as a means for injecting the viscous oil 5 on the surface of the electrode 1 side.

The oiling pipe 8 has a drip hole 8a in order to drip the viscous oil 5 having a predetermined viscosity such as engine oil from the upper end of the insulating part 3.

By the way, when the viscous oil 5 dripped from the drip hole 8a reaches the electric field formed by the first electrode 1 and the second electrode 2, it is subjected to Coulomb force and is applied to the first electrode of the insulating portion 3. 1
Diffuse on the side surface.

Further, 9 is a receiving portion for the viscous oil 5, and a cap 10 for discharging the viscous oil 5 and the sediment 5b at the bottom of the receiving portion 9 is screwed to the receiving portion 9.

A circulation pipe 12 connected to a pump 11 as a means for circulating the viscous oil 5 is further connected to the receiving portion 9.

The circulation pipe 12 is connected to the receiving portion 9 and the tank via the pump 11.
The tip portion 12a, which is a pipe connecting 13 and connected to the receiving portion 9, is set at a position higher than the bottom surface 9a of the receiving portion 9 and excludes suction of the precipitate 5b.

Further, the receiving portion 9 is provided with the viscous oil 5 contained in the exhaust gas.
It has a collision plate 9b for separating mist such as.

The receiving part 9 is connected to a lower duct 14 which is a passage for exhaust gas, and an upper part provided at a position facing the lower duct 14 is connected by a duct 15 to the payout corona generating part 6
Are pinched.

More specifically, the lower portion of the payout corona generating portion 6 is pressed against the lower duct 14 via a silicone rubber packing 16a, and the upper portion is also set via a packing 16b.
It is pressed against 7 and the set member 17 is fixed to the upper duct 15 by a screw 17a.

The set member 17 is a metal member having a shape as shown in FIG. 2, and facilitates removal and mounting of the brush corona generating portion 6 at the time of maintenance. Then, a collar portion 17c having a hole 17b into which the screw 17a is screwed,
The O-ring 17d is configured by a pressing portion 17f having a groove 17e into which the O-ring 17d is mounted.

Further, between the lower duct 14 and the upper duct 15, a ground plate 18 through which a plurality of brush corona generating portions 6 are inserted.
Is provided.

The earth plate 18 is the second part of each payer corona generating part 6.
Is a member for grounding the electrode 2 together with one end of the high-voltage power supply 4, and the earth plate 18 is electrically connected to the second electrode 2 via a contact member 19. The contact member 19 is a member made of a metal material such as beryllium or a copper alloy material, which is formed into a substantially U-shape as shown in FIG. The part 6 is easily removed and attached.

Although not shown in FIG. 1, the upper duct 15
A dehumidifying device is provided in the preceding stage to prevent the generation of dew drops in the brush corona generating section 6.

The upper duct 15 is connected to an engine (not shown), and the lower duct 14 is connected to an exhaust hole (not shown).

Next, the operation of the exhaust gas purifying device having each of the above-described configurations will be described with reference to FIG.

For example, an inlet hole 20 from an automobile engine (not shown).
The exhaust gas sent into the upper duct 15 through the arrow B passes through the plurality of payout corona generating portions 6 as indicated by the arrow C. At this time, the payer corona generating unit 6
The inside of the is lined with futon corona C1 due to the discharge phenomenon,
All the exhaust gas will pass through the atmosphere of the payer corona C1.

The exhaust gas contains impurities of harmful gases such as nitrogen compounds (NOx), and these ionized harmful gases are removed from the exhaust gas by the electric discharge action of the electric field in the payee corona generating portion 6. .

Then, the exhaust gas that has passed through the payout corona generating portion 6 reaches the lower duct 14 as indicated by an arrow D, and an arrow E
And an exhaust hole 21 at the rear stage through the receiving portion 9 as indicated by arrow F.
Is discharged to.

On the other hand, the viscous oil 5 is injected from the tank 13 to the brush corona generating section 6 through the oil injection pipe 8 and the drip hole 8a.
When the viscous oil 5 is dropped into the brush corona generating portion 6, it receives Coulomb force between both electrodes where the brush corona C1 is generated and is diffused and adsorbed on the surface of the insulating portion 3.

As a result, the surface of the insulating portion 3 is always smoothed by the viscous oil 5. Then, the viscous oil 5 flowing out of the brush corona generating portion 6 reaches the receiving portion 9 via the lower duct 14. At this time, part of the viscous oil 5 is contained in the exhaust gas as mist, and this mist collides with the collision plate 9b provided in the receiving portion 9, is stalled, and is collected in the receiving portion 9. As a result, the viscous oil 5 can be effectively used. Then, the viscous oil 5 accumulated in the receiving portion 9 is pumped up to the tank 13 by the pump 11 and is again injected into the payout corona generating portion 6.

[Advantages of the Invention] According to the invention, a first electrode made of a threaded conductor, a second electrode made of a conductor arranged so as to face the first electrode, and a second electrode Of at least the first electrode side surface of the insulating portion, the first electrode and the second
And a viscous oil in the atmosphere of the payoff corona generated in the payoff corona generating part to form a viscous oil film on the surface of the insulating part on the side of the first electrode. Is characterized in that it has an injection means for injecting and a circulation means for circulating the viscous oil flowing out from the brush corona generating portion to the injection means side, and in particular, the first electrode is a threaded conductor. Yes, the threads are formed on the surface of the threaded rod as a series of single pointed sharp protrusions.

Thus, since it is constructed together with the planar second electrode,
It has an excellent effect that the discharge phenomenon of corona discharge is extremely smoothed and the corona discharge capability is high. Further, by viscous oil film, it is possible to stably maintain and secure the generation of large-scale shoveling corona discharge over a long period of time, and by passing the exhaust gas of the automobile to the corona generating portion,
It has an excellent effect that harmful gases such as NOx in the exhaust gas can be stably removed over a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a preferred embodiment of the present invention, and FIG.
The figure is a side view of the set member shown in FIG.
FIG. 3 is a perspective view of an embodiment of the connector member shown in FIG. 4 to 6 are schematic diagrams for explaining the corona generation state of the present invention. FIG. 4 is a diagram showing a positive electrode corona generation state, FIG. 5 is a diagram showing a zero point state, and FIG. FIG. 6 is a diagram showing the state of occurrence of negative electrode corona. 1 ... First electrode made of a threaded conductor, 2 ...
… Second electrode, 3 …… Insulator, 4 …… High voltage power supply, 5 ……
Viscous oil, 5a ... Viscous oil film, 6 ... Pascher corona generating part, 7
…… Supporting part, 8 …… Oiling pipe, 8a …… Drip hole, 9 ……
Receiver, 10 ... Cap, 11 ... Pump, 12 ... Circulation pipe, 13 ... Tank, 14 ... Lower duct, 15 ... Upper duct, 17 ... Set member, 18 ... Ground plate, 19 ... …
Contact member

Claims (1)

(57) [Scope of utility model registration request] 1. A first electrode made of a threaded conductor, a second electrode made of a conductor arranged to face the first electrode, and at least the first electrode of the second electrode. An insulating part adhered to the surface of the electrode side and a brush corona generating part composed of a high voltage power source connected to the first electrode and the second electrode,
Injecting means for injecting viscous oil into the atmosphere of the brush corona generated in the brush corona generating portion to form a viscous oil film on the surface of the insulating portion on the first electrode side, and flowing out from the brush corona generating portion. An exhaust gas purifying apparatus, comprising: a circulation unit that circulates viscous oil to the injection unit side.