JP2002030920A - Plasma type exhaust gas purification device - Google Patents

Abstract

(57) [Problem] To loosen an extension pole or the like by extending one extension pole and a main connection line of a plurality of discharge tubes on one line or by increasing the strength of a support member. In order to stabilize the plasma intensity and prevent the exhaust gas from deteriorating. SOLUTION: A plurality of discharge tubes 8 each having a cylindrical outer pole 9 and an extension pole 11 arranged in the outer pole and extending in the length direction of the outer pole are arranged in parallel to an exhaust path R, and each discharge tube is arranged in parallel. In the plasma-type exhaust gas purifying apparatus 1 for purifying exhaust gas by generating a discharge between an inner pole and an outer pole of a tube, one of the plurality of discharge tubes is connected through a main connecting line 19 from which the inner pole extends. Connected to the power supply 24 and stretched under the tension for preventing loosening in the same direction as the main connection line 19, and the inner line pole of the other discharge tube is connected to the branch connection line 20 branched from the main connection line. It is characterized by having been done.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifier using discharge by a discharge tube, and more particularly to an improvement of a plasma type exhaust gas purifier having a plurality of discharge tubes arranged in parallel in an exhaust path.

[0002]

2. Description of the Related Art A plasma exhaust gas purifying apparatus connects a discharge tube to a high-voltage power supply and uses plasma generated by discharge of the discharge tube to detoxify NOx and the like in exhaust gas. A plasma exhaust gas purifying apparatus in which a large number of discharge tubes are arranged in parallel to purify exhaust gas has been proposed, and one example thereof is disclosed in Japanese Patent Application Laid-Open No. 2-207812. Here, since the distance between the cylindrical outer and inner poles of the discharge tube affects the plasma intensity, the distance between the outer and inner poles must be kept constant to generate stable plasma. In addition, both ends of the cylindrical outer pole support the ends of the extension pole via support members. By the way, in a plasma exhaust gas purifying apparatus having a large number of discharge tubes arranged in parallel in order to purify a large amount of exhaust gas, it is necessary to apply a voltage from a power supply circuit to the extension poles of the large number of discharge tubes. In this case, the extension pole of each discharge tube passes through the support member,
The branch connection lines extending from the portion are concentrated at one place, connected to a single common connection line, and then connected to the power supply side. Therefore, each branch connection line is displaced and stretched in a direction deviated in a direction normal to each extension pole with respect to a portion supported by the support member at the end of the extension pole of each discharge tube. Become. Here, in order for a large number of discharge tubes arranged in parallel to generate stable plasma, the distance between the outer and inner poles of each discharge tube must be kept constant, and the counter electrode of each discharge tube must be maintained. For the same reason, it is important that the power supply path between the power supply and the power supply is maintained in a stretched state without slack.

[0003]

In order to maintain the power supply path without slack, it is necessary to apply a certain amount of tension to each extension pole and the branch connection line extending therefrom.
However, in the case of a plasma exhaust gas purification apparatus using a large number of discharge tubes arranged in parallel, as described above, the branch connection line extending from the end of each extension pole to the end of each extension pole is in the normal direction. When a tension from the common connection line is received, a force acts to bring the inner pole closer to the outer pole by a component of the tension in the normal direction.
In this case, since the end of the extension pole of each discharge tube is supported by the support member, the support member is subjected to a component force and deteriorates with time, or excessive tension due to vibration or the like is applied to the extension pole and the branch connection. It may be damaged by receiving from the wire side, and the inner pole may be shifted so as to approach the outer pole. In this case, there is a possibility that the plasma intensity becomes unstable and the exhaust gas deteriorates.

Here, measures to simply increase the cross-sectional area of the support member and improve the strength can be considered. However, when it is necessary to form an exhaust gas passage area in the support member, the cross-sectional area of the support member is simply increased. There are limits to doing so. Based on the above-mentioned problem, the present invention provides an extension pole or the like by extending one extension pole and a main connection line of a plurality of discharge tubes on a line, or by increasing the strength of a support member. An object of the present invention is to provide a plasma exhaust gas purifying apparatus which is stretched without slack, stabilizes plasma intensity, and prevents exhaust gas deterioration.

[0005]

In order to achieve the above-mentioned object, a first aspect of the present invention is to provide a cylindrical outer pole and an inner pole disposed in the outer pole and extending in the longitudinal direction of the outer pole. A plurality of discharge tubes having a plurality of discharge tubes are arranged in parallel in an exhaust path, and a discharge is generated between an inner pole and an outer pole of each discharge tube to purify exhaust gas. Is connected to the power supply via a main connection line whose extension pole extends therefrom, and is stretched in the same direction as the main connection line under tension to prevent loosening. It is characterized by being connected to a branch connection line branched from the main connection line. In this way, one extension pole of the plurality of discharge tubes and the main connection line extending therefrom are stretched on one line under the tension for preventing loosening in the same direction, so that the extension pole is connected to the outer pole. It is possible to suppress the component force of the approaching tension from acting on the support member, the outer pole, or another discharge tube, which is a peripheral member of the extension pole. Therefore, the durability of the support member, the outer pole, and other discharge tubes can be ensured, and a large tension is applied to the main connection line, which is stably stretched. Since the extension pole of the tube is extended, the extension pole of the other discharge tube and the branch connection line extending therefrom can be extended without loosening, improving reliability, stabilizing the plasma intensity, and reducing the exhaust gas deterioration. Can be prevented.

According to a second aspect of the present invention, a discharge tube having a cylindrical outer pole and an inner pole disposed in the outer pole and extending in the length direction of the outer pole is provided in an exhaust path. In a plasma type exhaust gas purifying apparatus, which is disposed in parallel with each other and purifies exhaust gas by generating a discharge between an inner pole and an outer pole of each discharge tube, the plasma type exhaust gas purifying apparatus is provided between an outer pole and an inner pole of each discharge tube. A support member for supporting the end of the extension pole, and a plurality of branch connections each having one end connected to the extension pole of each of the discharge tubes, a plurality of other ends being assembled and connected to the power supply side, and having tension applied to prevent loosening. And the rigidity of the supporting member in the direction in which the tension or its component acts is greater than the rigidity in the other direction. As described above, since the support member of each discharge tube can enhance the rigidity in the direction in which the tension or its component acts, the durability can be improved and the plasma intensity can be stabilized. Preferably, the support member may be formed such that a pillar portion extending in a direction in which the tension or the component force acts thereon is larger than a cross-sectional shape of a pillar portion extending in another direction. In this case, since the cross-sectional shape of the pillar portion extending in the direction in which the tension or the component force acts is formed relatively large,
Enhance rigidity sufficiently against tension, etc., and ensure durability.
As a result, the plasma intensity can be stabilized. Moreover, the cross-sectional shape of the column extending in other directions is set relatively small,
A space such as a gas passage can be easily secured, and the function as a support member with a gas passage can be maintained.

[0007]

1 to 4 show a plasma type exhaust gas purifying apparatus 1 as an embodiment of the present invention. In this plasma type exhaust gas purifying apparatus 1, a casing 2 is disposed in the middle of an exhaust pipe 3 forming an exhaust path R.
The exhaust gas from the vehicle engine (not shown) on the upstream a side is made harmless and is opened to the atmosphere via a muffler (not shown) on the downstream b side. Casing 2 is inlet 4
And the bulging space 6 and the outlet 5 form a deformed cylindrical member formed continuously in this order along the front-rear direction X. Flanges 7 are welded to the outer walls of the inflow port 4 and the outflow port 5, respectively. The flanges 7 are hermetically sealed to the front and rear exhaust pipes 3 via the respective flanges 7, and then tightened and connected by bolts or fasteners (not shown). .

[0008] Three discharge tube rows A1, A2 and A3 (see FIG. 3) are vertically arranged in a bulging space 6 at the center of the casing 2.
(In FIGS. 1 and 3, in the direction perpendicular to the paper surface), they are accommodated in a state of being overlapped, and an electrode extension frame 15 is disposed in front of them. As shown in FIGS. 1 and 3, the discharge tube row A1 is configured by arranging four discharge tubes 8 whose front and rear ends are directed to the inflow port 4 and the outflow port 5 in parallel in the width direction Y. Row A2 is a discharge tube 8 having the front and rear ends directed to the inlet 4 and the outlet 5 in the width direction Y.
The discharge tube row A3 is also formed by arranging four discharge tubes 8 in parallel in the width direction Y. Each discharge tube 8 has a metallic cylindrical outer pole 9 and an inner pole 11 arranged in the outer pole 9 and extending in the front-rear direction X which is the length direction of the outer pole. The three discharge tube rows A1, A2, A3 sequentially overlapping in the vertical direction Z are attached to the inner peripheral wall 2 of the casing 2 via mounting frames 13, 14 formed of front and rear insulating materials.
01 is attached without any shift.

As shown in FIG. 1, the front mounting frame 13 has a main portion 131 and a front flange 13 which is a front and rear bent extension portion.
2 and the rear locking portion 133 are integrally formed. Main part 1
31 is fixed to the inner peripheral wall 201 by fixing means (not shown),
The front flange 132 is formed as an annular flange projecting a predetermined amount inside the inner peripheral wall 201. The rear locking portion 133 is formed in a perforated plate shape having a large number of holes that penetrate the respective outer poles 9 and lock the insulating tube 12. Similarly, the rear mounting frame 14 integrally forms the main portion 141, the front locking portion 142 and the rear flange 143 which are bent and extended portions thereof. The main part 141 is fixed to the inner peripheral wall 201 by fixing means (not shown), and the front locking part 142 is formed in a perforated plate shape having a large number of holes for penetrating the outer poles 9 and locking the insulating cylinder 12. . The rear flange 143 is formed as an annular flange protruding from the inner peripheral wall 201 by a certain amount. For this reason, each discharge tube 8 is attached to the bulging space 6 of the casing 2 without displacement by the rear locking portion 133 of the front mounting frame 13 and the front locking portion 142 of the rear mounting frame 14, and from the upstream a side. The exhaust gas is formed so as to be dispersed and passed through the plurality of discharge tubes 8. Also, the exhaust gas is blocked so as not to flow into the gap between the discharge tubes.

Each of the discharge tubes 8 of the three discharge tube rows A1, A2, A3 has the same structure as a single unit without a connection line.
The outer pole 9 of each discharge tube 8 is formed as a metal cylindrical body,
Support members 16 and 17 for supporting the ends of the extension pole 11 are respectively provided at the front and rear ends of the inner peripheral wall, and are fixed with a predetermined heat-resistant adhesive. The front and rear support members 16 and 17 have the same shape, and as shown in FIG. 4A, are block members having cross-shaped end faces, and are formed of an insulating material, for example, ceramic. The front and rear support members 16 and 17 (represented by the front support member) are vertical columns 1 extending in the vertical direction Z.
61 and the horizontal columns 162 extending in the width direction Y intersect, and a gas passage r for allowing exhaust gas to pass in the front-rear direction X is formed between the columns.

At the center of the intersection between the vertical column 161 and the horizontal column 162, a pore p is formed in the front and rear direction, and is formed in the pore p so as to penetrate the extension pole 11 which is a metallic cable. . Here, the extension pole 11 supported by the later supporting member 17
The rear end portion is subjected to a diameter increasing process to form a retaining portion d, so that each extension pole 11 is formed so as not to come off even if it receives a pulling force forward. In this way, each discharge tube 8 can be supported by the front and rear support members 16 and 17 so that the extension pole 11 is located on the center line of the outer pole 9, and the distance between the counter electrode composed of the extension pole 11 and the outer pole 9 of the discharge vessel is provided. To the front-back direction X
At a constant interval. By connecting a high-voltage power supply 24 described later to such a counter electrode, the discharge tube 8 forms a uniform discharge region in the front-rear direction X, and the plasma generated by the discharge tube 8 generates hydrocarbons, nitrogen oxides, and monoxide. Exhaust gas components containing carbon and other emissions such as carbon are reacted with harmless components and discharged to the downstream b side.

The four discharge tubes 8 forming the first discharge tube row A1
Of which is second from one end (third from above in FIGS. 1 and 3)
Of the discharge tube 8 is set as the center electrode 11a in particular. The center-of-gravity electrode 11a has its front end penetrated through the pore p of the front support member 16 and is connected to the tension adjuster 18a of the electrode extension frame 15 via the main connection line 19 extending therefrom. . Five discharge tubes 8 forming a second discharge tube row A2
Of these, the third discharge tube 8 (third from above in FIG. 3) from one end has its extension pole 11 set as a center-of-gravity electrode 11b. The center-of-gravity electrode 11b has its front end penetrated through the pore p of the front support member 16 and is connected to the tension adjuster 18b of the electrode tension frame 15 via the main connection line 19 extending therefrom. .

Four discharge tubes 8 forming a third discharge tube row A3
Of these, the second (from the top in FIG. 3) discharge tube 8 from one end has its extension pole 11 set as a center-of-gravity electrode 11c. The center-of-gravity electrode 11c has its front end penetrated through the fine hole p of the front support member 16 and is connected to the tension adjuster 18c of the electrode tension frame 15 via the main connection line 19 extending therefrom. . The electrode extension frame 15 has a rigid frame portion 151.
And a board part 153 attached at the center of the frame part via an insulating material 152. The frame 151 abuts its peripheral edge against the inner peripheral wall 201 of the casing 2, and a plurality of portions are fixed to the inner peripheral wall 201 via the locking bracket 21 without displacement.
In addition, the frame portion 151 has a plurality of through holes 30 at positions that do not interfere with the peripheral edge of the central hole to secure a gas passage. Further, the frame 151 has an annular step e1 having a step in the thickness direction at the inner peripheral edge of the center hole. An annular locking portion e2 on the outer peripheral edge of the substrate portion 153 can abut on the annular step portion e1 via the insulating material 152.
53 is reliably prevented from moving downstream b. In addition,
The substrate 153 is integrally connected to the frame 151 by fastening means (not shown).

In the center of the substrate section 153, three tension adjusters 18a, 18b, 18c having the same structure are sequentially mounted at predetermined intervals. Each of the tension adjusters 18a, 18b, 18c includes a bolt B with a hole screwed into the base plate 153 and a locking block C abutting on the head thereof. The locking block C is made of metal and is integrally connected to the tip of the main connection wire 19 that has penetrated the bolt with hole B. The periphery of the connection portion abuts on the head of the bolt with hole B, and the top on the opposite side is One of the branches on the side of the external connection line 22 is joined. Here, the tension of the main connection line 19 integral with the locking block C can be changed by rotating the bolt B with a hole. In some cases, a spacer (not shown) may be inserted between the head of the bolt B with a hole and the substrate 153,
A positioning nut (not shown) may be screwed to the bolt B with holes to prevent a deviation in tension.

Each of the thus supported discharge tubes 8 is applied with a high voltage from a high-voltage power supply 24 described later,
As the outer pole 9 approaches the extension pole 11, a discharge region having a higher level of discharge potential is formed, and the discharge region can be formed continuously in the front-rear direction X. Moreover, the purification efficiency for detoxifying the exhaust gas passing through each discharge tube 8 is set to an appropriate value.
That is, the number, outer diameter, and the like of each discharge tube 8 of the three discharge tube rows A1, A2, and A3 are appropriately set so that the pressure of the exhaust gas, the exhaust gas flow rate, and the like are maintained at appropriate values. Here, each discharge tube row A1, A2, A3 is connected to each center-of-gravity electrode 11a, 11b, 1
1c and each main connection line 19 are arranged on one line, and are formed so that tension in the front-rear direction X, which is the same direction, is set. Further, the branch connection line 20 extending from the extension pole 11 of the other discharge tube 8 of each discharge tube row A1, A2, A3 is located on the side of the main connection line 19 which is a direction deviated in the normal direction of each extension pole 11. Each is bent and displaced, and the tip portions are assembled together, and are connected to the main connection line 19 at the assembly connection portion g.

In this state, the tension adjusters 18a, 18b,
When the predetermined tension is set by 18c, the slack of each extension pole 11, main connection line 19, branch connection line 20 and the like can be eliminated, and these wirings can be stably set at predetermined positions. On this occasion,
Each main connection line 19 and center-of-gravity electrodes 11a, 11b, 11c
On the sides, tension is applied to them in the same direction, that is, on the center line of each outer pole 9, and no component force is generated in the normal direction.
For this reason, the supporting members 16 on the front side supporting the center-of-gravity electrodes 11a, 11b, and 11c are hardly applied with a pressing force from the side of the center-of-gravity electrodes, and the durability of the supporting member 16 formed of ceramic or the like can be ensured. Damage can be prevented.

Furthermore, the tension applied to the branch connection line 20 and the extension pole 11 of the other discharge tube 8 is reduced by the center-of-gravity electrodes 11a and 11b.
Compared to the tension applied to the b and 11c sides, the tension acts in a direction smaller by the displacement in the normal direction. Therefore, on the other discharge tube 8 side, the pressing force on the supporting member 16 caused by the change in the pulling direction between the branch connection line 20 and the extension pole 11 at the contact position with the supporting member 16 is compared. Very small
It is possible to reduce the possibility that the front support member 16 receives the pressing force to reduce its durability or breakage. As shown in FIG. 1, the external connection lines 22 joined via the branch portions from the respective locking blocks C of the three tension adjusting devices 18a, 18b, 18c.
Extends from the casing 2 to the outside and is connected to the high voltage terminal 241 of the high voltage power supply 24. The base terminal 242 on the low potential side of the high voltage terminal 241 is grounded to a vehicle body base (not shown) and extends a base connection line 25. The extension end branches into a plurality of branch lines, and each branch line is opposed to each other. Connected to the outer pole 9 of the discharge tube 8.

In such a plasma-type exhaust gas purifying apparatus 1, the high-voltage power supply 24 is turned on at the same time as the driving of the engine of the vehicle (not shown), and the discharge tubes 8 of the three discharge tube rows A1, A2, A3.
Starts discharging. Here, the electrode extension frame 1
Exhaust gas that has passed through the through hole 30 of the front and rear mounting frames 1
Three discharge tube arrays A1, A2, A3 supported by 3, 14
Into each discharge tube 8. Here, the plasma-type exhaust gas purifying apparatus 1 uses each discharge tube 8 set to an appropriate number, an outer diameter, and the like, and maintains the gas pressure and the gas flow rate appropriately, and also forms the outer pole 9 and the extension pole 11 of each discharge tube 8. The exhaust gas can be rendered harmless in an atmosphere that appropriately maintains a discharge area between the gas and the gas, and can flow to the downstream side b.

As described above, in the plasma type exhaust gas purification apparatus 1 shown in FIG. 1, the supporting member 16 supporting the center-of-gravity electrodes 11a, 11b, 11c of the three discharge tube rows A1, A2, A3 is not subjected to the pressing force, and Since the support member 16 of the discharge tube 8 also receives only a relatively small pressing force from the branch connection line 20 and the extension pole 11 side, the durability of each of these support members can be maintained, their breakage is prevented, and Center of gravity electrodes 11a, 11
b, 11c and the slack of the extension pole 11 side and the slack of the main connection line 19 and the branch connection line 20 can be eliminated, and can be stably extended, the stable discharge operation can be continued, and the plasma intensity can be stabilized. In addition, exhaust gas deterioration can be prevented. FIGS. 5 and 6 show a plasma type exhaust gas purifying apparatus 1b as one embodiment of the second invention.

This plasma type exhaust gas purifying apparatus 1b is different from the plasma type exhaust gas purifying apparatus 1 shown in FIG.
1, B2, and B3 are different from each other, and include a large number of the same components except that the layout of connection lines extending from each of the discharge tubes 8 described later is different. For this reason, the same reference numerals are given to the overlapping members within a range not to be confused here, and a suffix b is added to a part, and the overlapping description is omitted. In a plasma type exhaust gas purification apparatus 1b shown in FIG. 5, a casing 2b is provided in the middle of an exhaust pipe 3 forming an exhaust path R. In the casing 2b, three discharge tube arrays B1, B2, and B3 (see FIG. 6) are accommodated in the bulging space 6 in a state where they overlap each other in the vertical direction Z, and an electrode extension frame 15b is disposed in front of them. You.

As shown in FIG. 5, each discharge tube row B1, B
2 and B3, four discharge tubes 8 whose front and rear ends are directed to the inflow port 4 and the outflow port 5 are arranged in parallel in the width direction Y.
The three discharge tube arrays B1, B2, and B3 are connected to the casing 2b via mounting frames 13 and 14 formed of front and rear insulating materials.
Are attached to the inner peripheral wall 201 without deviation. Support members 16b and 17b for supporting the front and rear ends of the extension pole 11 are fixed to the inner peripheral wall of the outer pole 9 of each discharge tube 8 with a heat-resistant adhesive.

As shown in FIG. 4B, front and rear support members 31 and 32 (represented by the front support member) are a vertical column 311 extending in the vertical direction Z and a horizontal column extending in the width direction Y. 3
12 intersect with each other to form a gas passage r between the columns for allowing exhaust gas to pass in the front-rear direction X. Here, the support member 3
In 1, the vertical column 311 has a larger cross-sectional shape than the horizontal column 312. Since the vertical column 311 is located in a direction in which tension or its component acts as described later, the vertical column 31
1 is formed so as to have a larger cross-sectional shape and a larger cross-sectional rigidity than the horizontal column 312 to enhance durability, and the horizontal column 312 is set to have a relatively small cross-sectional shape. A predetermined passage area is secured. Although FIG. 4B shows an example in which the width of the vertical column 311 is larger than that of the horizontal column 312, the length in the axial direction may be increased to set the cross-sectional shape larger.

At the center of the intersection between the vertical column 311 and the horizontal column 312, a pore p penetrating through the extension pole 11 is formed forward and backward. Here, the rear end portion of the extension pole 11 supported by the later support member 32 is subjected to a diameter expansion process to form a retaining portion d. Here, the front and rear support members 31 and 32 have the same shape. However, in some cases, only the rear support member 32 is configured as shown in FIG.
As shown in (a), the vertical columns and the horizontal columns may be formed so that their cross-sectional shapes are substantially the same and maintain the same rigidity.

Each discharge tube 8 of each discharge tube row B1, B2, B3
Extends the branch connection line 20b from the extension pole 11, and the branch connection line 20b is bent and displaced toward the center position side of each discharge tube row, which is a direction deviated in the normal direction of each extension pole 11, and has a tip portion. It is configured to be assembled together and to be connected to the main connection line 19b side at the assembly connection part g. Here, when the tension adjusters 18a, 18b and 18c (only one is shown in FIG. 5 because they are sequentially arranged in the direction perpendicular to the paper surface) set a predetermined tension, each extension pole 11, branch connection line 20b, main connection The slack of the wire 19b and the like can be eliminated, and these wires can be stably set at predetermined positions.

At this time, the tension of the branch connection line 20b which is branched from each of the main connection lines 19 changes at the contact position with each of the support members 31 on the front side.
Transmit the branch pulling force to 1. In this state, a component force of a pulling force is applied to the extension pole 11 side such that the extension pole approaches the outer pole 9 side. In this case, the vertical column 311 of each support member 31 which receives the component force directly has a relatively large sectional shape,
Since the sectional rigidity is relatively large, the durability can be sufficiently maintained even when the above-described component force is constantly applied, and the occurrence of breakage or the like is prevented.

The plasma type exhaust gas purifying apparatus 1b shown in FIG. 5 uses discharge tubes 8 set to an appropriate number and an outer diameter, etc., as in the case of the plasma type exhaust gas purifying apparatus 1 shown in FIG.
Exhaust gas can be rendered harmless in an atmosphere in which the gas flow rate is properly maintained and the discharge area between the outer pole 9 and the inner pole 11 of each discharge tube 8 is appropriately maintained, and the exhaust gas can flow to the downstream b side. here,
In particular, the cross-sectional shape of the vertical column 311 at a portion where the tension of the supporting member 31 of each discharge tube or the component thereof acts in a direction in which it is relatively large is set to enhance rigidity, improve durability, and further improve plasma intensity. Can be stabilized. Moreover, the cross-sectional shape of the horizontal pillar 312 extending in the other direction is set relatively small, so that the space for the gas passage r can be easily secured, and the function as the support member with the gas passage can be easily secured.

In the above description, the plasma-type exhaust gas purifying apparatuses 1 and 1b are arranged so that the discharge tube rows A1, A2, A3 or B1, B2, B3 in which a plurality of discharge tubes are connected in parallel are vertically arranged.
Although a stacked structure was adopted, the present invention is not limited to this.The discharge tube rows to be superimposed and the number of discharge tubes constituting each discharge tube row can be changed as appropriate. The discharge tube row may be formed in a state where the outer poles 9 of the tube are directly joined to each other. In these cases, the same operation and effect as those of the apparatus of FIG. 1 can be obtained. In addition, the embodiment shown in FIG.
1B, the support member 16 of the discharge tube other than the center-of-gravity electrode of FIG. 1 may be a support member 31 having the shape shown in FIG. 4B. In this case, durability and reliability are reduced. It can be further improved.

[0028]

As described above, according to the first aspect of the present invention, the component of the tension at which the inner pole approaches the outer pole acts on the supporting member, the outer pole, or another discharge tube which is a peripheral member of the inner pole. Therefore, it is possible to secure the durability of the support member, the outer pole, other discharge tubes, etc., and furthermore, to connect the branch connection line to the main connection line which is stably stretched by applying a large tension. Since the extension pole of the other discharge tube is stretched through, the extension pole of the other discharge tube and the branch connection line extending therefrom can be stretched without loosening, thereby improving reliability and eventually stabilizing the plasma intensity. In addition, exhaust gas deterioration can be prevented.

According to the second aspect of the present invention, since the supporting member of each discharge tube can increase the rigidity in the direction in which the tension or its component acts, the durability can be improved and the plasma intensity can be stabilized.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a plasma type exhaust gas purification apparatus as one embodiment of the present invention.

FIG. 2 is a side sectional view of the plasma type exhaust gas purification apparatus of FIG.

FIG. 3 is a partial perspective view of an upper part of a discharge tube row of the plasma type exhaust gas purification apparatus of FIG. 1;

4A and 4B are perspective views of a support member used in each of the plasma-type exhaust gas purification apparatuses of the present invention, wherein FIG. 4A is employed in the plasma-type exhaust gas purification apparatus of FIG. 1 and FIG. Shows what was adopted in the device.

FIG. 5 is a plan sectional view of a plasma type exhaust gas purification apparatus as another embodiment of the present invention.

6 is a partial perspective view of an upper part of a discharge tube row of the plasma type exhaust gas purification apparatus of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1b Plasma-type exhaust gas purification device 8 Discharge tube 9 Outer pole 11 Extension pole 16, 17 Support member 19 Main connection line 20 Branch connection line 24 High-voltage power supply (power supply) 31, 32 Support member R Exhaust path (exhaust path)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhito Kawashima 5-33-8 Shiba, Minato-ku, Tokyo, Mitsubishi Motors Corporation (72) Keisuke Kawamura 5-7-17-1 Fukahori-cho, Nagasaki-shi・ Mitsubishi Heavy Industries, Ltd.Nagasaki Research Laboratories (72) Inventor Yo Kawamura 1200, Higashi-Tanaka, Komaki City, Aichi Prefecture ・ Mitsubishi Heavy Industries, Ltd. Nagoya Guidance Propulsion System Works CA20 4G075 AA03 BA01 BA05 BA06 BD05 BD12 CA47 EB42

Claims (2)

[Claims] A plurality of discharge tubes having a cylindrical outer pole and an inner pole disposed in the outer pole and extending in the length direction of the outer pole are arranged in parallel with the exhaust path, and the inner line of each discharge tube is arranged. In a plasma type exhaust gas purification apparatus for purifying exhaust gas by generating a discharge between a pole and an outer pole, one of the plurality of discharge tubes is connected to a power supply via a main connection line whose extension pole extends therefrom. And at the same time as the main connection line, is stretched under tension for preventing loosening, and the extension pole of another discharge tube is connected to a branch connection line branched from the main connection line. Plasma type exhaust gas purifier. 2. A plurality of discharge tubes having a cylindrical outer pole and an inner pole disposed in the outer pole and extending in the length direction of the outer pole are arranged in parallel in the exhaust path, and each discharge tube has an inner line. In a plasma-type exhaust gas purification apparatus that purifies exhaust gas by generating a discharge between a pole and an outer pole, a supporting member provided between an outer pole and an inner pole of each of the discharge tubes and supporting an end of the inner pole, A plurality of branch connection lines, one end of which is connected to an extension pole of each of the discharge tubes, the other end of which is collectively connected to a power supply side, and a plurality of branch connection lines to which tension for preventing loosening is applied; Alternatively, the plasma type exhaust gas purification apparatus is characterized in that the rigidity in the direction in which the component force acts is formed larger than the rigidity in other directions.