JP2017157363A - Plasma reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma reactor which can improve its reliability by preventing the deformation or breakage of its components.SOLUTION: A plasma reactor according to the present invention comprises a plasma panel laminate 20, clamps 50 to 55, and a mat 71. The plasma panel laminate 20 has a structure in which electrode panels 30 are laminated on top of each other, and generates plasma by applying a voltage between the adjacent electrode panels 30. The clamps 50 to 55 clamp the plurality of electrode panels 30 from the outside so as to fix them. The mat 71 is interposed between a case and the plasma panel laminate 20 so as to hold the plasma panel laminate 20. The plasma reactor has gaps S1 to S4 at least in one of the portions between the mat 71 and the clamps 50 to 55, or between the case and the clamps 50 to 55.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a plasma reactor, and more particularly to a plasma reactor suitable for an apparatus for purifying exhaust gas from an internal combustion engine (engine).

  Conventionally, exhaust gas from an engine or incinerator is passed through a plasma field, so that CO (carbon monoxide), HC (hydrocarbon), NOx (nitrogen oxide), and PM (particulate matter) contained in the exhaust gas are in particulate form. Plasma reactors for treating harmful substances such as substances have been proposed.

  For example, by laminating a plurality of electrode panels on which discharge electrodes are formed and applying a voltage between adjacent electrode panels to generate low temperature plasma (non-equilibrium plasma) due to dielectric barrier discharge, the electrodes flow between the electrode panels. Various plasma reactors that oxidize and remove PM in exhaust gas have been proposed (see Patent Documents 1 to 3). The plasma reactors described in Patent Documents 1 to 3 include a case for accommodating a plasma panel laminate formed by laminating electrode panels, a mat interposed between the case and the plasma panel laminate, and the like. Yes. Further, another component is provided in the plasma reactor. For example, a lead line member is provided in the plasma reactor described in Patent Document 1, and the lead line member is in contact with a housing (case) via a mat. Further, in the plasma reactor described in Patent Document 3, a fixed mat (mat) is interposed between the frame body and the case body (case), and the frame body contacts the case body via the fixed mat. Yes.

Japanese Patent No. 3832654 (FIG. 4 etc.) US Pat. No. 6,464,945 (FIG. 8 etc.) Japanese Patent No. 4448097 (paragraphs [0068] to [0070], FIG. 9 etc.)

  By the way, when the plasma reactor is mounted on a vehicle or the like and used, high-temperature exhaust gas flows through the plasma reactor, so that the inside of the plasma reactor is heated by the exhaust gas. On the other hand, since the outside of the plasma reactor is cooled by the traveling wind, the temperature does not increase as in the inside of the plasma reactor. Therefore, the plasma panel stack inside the plasma reactor expands as the temperature rises, but the case exposed outside the plasma reactor does not rise so much in temperature, so it expands like a plasma panel stack. Disappear. As a result, a large force acts on the above-described separate part through the mat from the case due to the stress caused by the difference in thermal expansion between the case and the plasma panel laminate (electrode panel), resulting in deformation or breakage of the separate part. There is a fear.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a plasma reactor capable of improving reliability by suppressing the occurrence of deformation and destruction of parts.

  As means (means 1) for solving the above-mentioned problems, a plasma panel has a structure in which a plurality of electrode panels having discharge electrodes are laminated, and plasma is generated by applying a voltage between the adjacent electrode panels. A laminated body, a clamp that sandwiches and fixes the plurality of electrode panels from the outside, a case in which the plasma panel laminated body is accommodated, and the plasma panel laminated body interposed between the case and the plasma panel laminated body A plasma reactor comprising a mat for holding a gap between at least one of the mat and the clamp and between the case and the clamp. is there.

  Therefore, in the invention described in the above means 1, there is a gap between at least one of the mat and the clamp and between the case and the clamp. For this reason, even if a stress due to the difference in thermal expansion between the case and the plasma panel laminate occurs, it is difficult for the stress to act on the clamp (component) from at least one of the mat and the case. Destruction is suppressed. Therefore, the reliability of the plasma reactor can be improved.

The plasma panel laminate constituting the plasma reactor has a structure in which a plurality of electrode panels having discharge electrodes are laminated. Examples of the material for forming the discharge electrode include tungsten (W), molybdenum (Mo), ruthenium oxide (RuO ₂ ), silver (Ag), copper (Cu), platinum (Pt), and the like.

  The clamp preferably has a gap between it and the mat. In this way, even if a stress due to the difference in thermal expansion between the case and the plasma panel laminate occurs, the stress is less likely to act on the clamp from the mat, so that deformation and breakage of the clamp are suppressed. . Therefore, the reliability of the plasma reactor can be improved. The size of the gap generated between the mat and the clamp is preferably, for example, not less than 0.5 mm and not more than 30 mm. Considering the influence of variation at the time of assembly, the size of the gap is preferably 0.5 mm or more. On the other hand, if the size of the gap is larger than 30 mm, the contact area between the case and the mat and the contact area between the mat and the plasma panel laminate are reduced, so that the plasma panel laminate can be securely attached to the case via the mat. There is a possibility that it cannot be fixed.

  In addition, the structure having a gap between the mat and the clamp is not particularly limited. For example, a notch that penetrates the mat in the thickness direction is arranged on the mat, and the clamp is clamped in the inner region of the notch. For example, there may be provided a gap between the mat and the clamp. In this way, for example, it is not necessary to use a plurality of mats in order to provide a gap, so that the number of parts can be reduced and the mat assembly work is facilitated.

  Further, the structure having a gap between the case and the clamp is not particularly limited. For example, a relief recess for generating a gap between the inner surface of the case and the region in contact with the clamp in the mat is provided. Examples include those provided, and those in which a gap is formed between the case and the case by forming the area corresponding to the clamp in the mat thinner than other areas. If these structures are adopted, even if a stress due to the difference in thermal expansion between the case and the plasma panel laminate occurs, it becomes difficult for the stress to act on the clamp from the case through the mat. And destruction is suppressed. Therefore, the reliability of the plasma reactor is improved.

1 is a schematic cross-sectional view showing a plasma reactor in the present embodiment. The top view which shows a plasma reactor. The perspective view which shows the state in which the plasma panel laminated body is accommodated in the case. The side view which shows the state in which the plasma panel laminated body is accommodated in the case. The top view which shows a plasma panel laminated body, a clamp, an external terminal, and a mat | matte. The perspective view which shows a plasma panel laminated body, a clamp, an external terminal, and a mat | matte. The top view which shows a plasma panel laminated body, a clamp, and an external terminal. The perspective view which shows a plasma panel laminated body, a clamp, and an external terminal. The perspective view which shows an electrode panel. The top view which shows a plasma panel laminated body, a clamp, an external terminal, and a mat | matte in other embodiment. The perspective view which shows a plasma panel laminated body, a clamp, an external terminal, and a mat | matte in other embodiment. The perspective view which shows a plasma panel laminated body, a clamp, an external terminal, and a mat | matte in other embodiment. In other embodiment, the fragmentary sectional view which shows the state in which the plasma panel laminated body is accommodated in the case. In other embodiment, the fragmentary sectional view which shows a plasma panel laminated body, a clamp, an external terminal, and a mat | matte.

  Hereinafter, an embodiment of the plasma reactor 1 of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 4, the plasma reactor 1 of the present embodiment is a device that removes PM contained in exhaust gas of an automobile engine (not shown), and is attached to an exhaust pipe 2. . The plasma reactor 1 includes a pulse generation power source 3, a case 10, and a plasma panel laminate 20.

  The case 10 is formed in a rectangular cylinder shape using, for example, stainless steel. The thermal expansion coefficient of the case 10 is about 10 to 18 ppm / ° C. In addition, the thermal expansion coefficient of case 10 says the average value of the measured value between normal temperature and 300 degreeC. A first cone portion 11 is connected to a first end portion (left end portion in FIG. 1) of the case 10, and a second cone portion 12 is connected to a second end portion (right end portion in FIG. 1) of the case 10. Yes. Further, the first cone portion 11 is connected to the upstream portion 4 (engine portion) of the exhaust pipe 2, and the second cone portion 12 is connected to the downstream portion 5 (opposite side of the engine side) of the exhaust pipe 2. Part). The exhaust gas from the engine flows into the case 10 from the upstream portion 4 of the exhaust pipe 2 through the first cone portion 11, passes through the case 10, and then passes through the second cone portion 12 to the exhaust pipe. 2 flows out to the downstream part 5.

  As shown in FIGS. 1 and 3 to 8, the plasma panel laminate 20 is housed in the case 10, and includes a pair of gas passage surfaces 21 and 22 and four gas non-passage surfaces 23, 24, 25 and 26 and has a substantially rectangular parallelepiped shape. Both gas passage surfaces 21 and 22 are located on opposite sides of the plasma panel laminate 20. On the other hand, the gas non-passing surfaces 23 to 26 are located between the pair of gas passing surfaces 21 and 22.

  The plasma panel laminate 20 has a structure in which a plurality of electrode panels 30 are laminated. Each electrode panel 30 is arranged in parallel with the passage direction of the exhaust gas in the case 10 (the direction from the exhaust gas inlet 11 toward the exhaust gas outlet 12), and is spaced from each other (in this embodiment, a gap of 0.5 mm). It is arranged to have.

  As shown in FIG. 1, the first wiring 6 and the second wiring 7 are alternately and electrically connected to each electrode panel 30 along the thickness direction of the plasma panel laminate 20. The first wiring 6 is electrically connected to the first terminal of the pulse generating power supply 3, and the second wiring 7 is electrically connected to the second terminal of the pulse generating power supply 3.

As shown in FIG. 1 and FIG. 9, the electrode panel 30 of the present embodiment has a first main surface 31 and a second main surface 32 and has a substantially rectangular plate shape of 100 mm long × 200 mm wide. . The first main surface 31 and the second main surface 32 are located on opposite sides in the thickness direction of the electrode panel 30. Further, the electrode panel 30 has a structure in which a discharge electrode 34 (thickness 10 μm) is built in a rectangular plate-like dielectric 33. In the present embodiment, the dielectric 33 is made of ceramic such as alumina (Al ₂ O ₃ ), and the discharge electrode 34 is made of tungsten (W). In addition, the thermal expansion coefficient of the dielectric 33 is about 2 to 8 ppm / ° C., and in the present embodiment in which the dielectric 33 is made of alumina, it is about 7 ppm / ° C. The thermal expansion coefficient of the dielectric 33 is an average value of measured values between room temperature and 400 ° C. In addition, the dielectric 33 has a recess 35 that opens at the second main surface 32. The recess 35 extends in the lateral direction of the electrode panel 30 and opens at both end faces of the electrode panel 30. In the plasma panel laminate 20 of the present embodiment, the exhaust gas flow path is constituted by the recess 35 and the first main surface 31 of the electrode panel 30 adjacent to the lower layer side. The lowermost electrode panel 30 constituting the plasma panel laminate 20 is not formed with the recess 35 because the electrode panel 30 does not exist on the lower layer side.

  As shown in FIG. 9, conductive structures 40 that connect the first main surface 31 side and the second main surface 32 side are respectively provided on both side portions of the recess 35 in the electrode panel 30. Each conduction structure 40 includes a through-hole conductor 41, a first pad 42, and a second pad 43. The through-hole conductor 41 passes through the first main surface 31 and the second main surface 32. And the through-hole conductor 41 provided in one conduction | electrical_connection structure 40 penetrates the extension part 36 extended in the outer peripheral side from the discharge electrode 34 in addition to the 1st main surface 31 and the 2nd main surface 32. Yes. The first pad 42 is formed on the first main surface 31 and is electrically connected to the end of the through-hole conductor 41 on the first main surface 31 side. On the other hand, the second pad 43 is formed on the second main surface 32 and is electrically connected to the end of the through-hole conductor 41 on the second main surface 32 side. The first pad 42 and the second pad 43 each have a rectangular shape, and the surface thereof is plated with Ni or the like.

  As shown in FIG. 7 and FIG. 8, the plasma reactor 1 includes three third electrodes that sandwich and fix each electrode panel 30 (plasma panel laminate 20) from the outside (specifically, the gas non-passing surface 24 side). 1 clamp 50, 51, 52 and three 2nd clamps 53, 54, 55 which clamp and fix each electrode panel 30 from the outside (specifically, the gas non-passing surface 26 side). Each clamp 50-55 is formed by bending a metal plate (for example, stainless steel plate). The first clamps 50 to 52 are arranged at equal intervals along the horizontal direction of the plasma panel stack 20 (direction perpendicular to the stacking direction of the electrode panel 30) on the gas non-passing surface 24. The second clamps 53 to 55 are arranged at equal intervals along the horizontal direction of the plasma panel stack 20 on the gas non-passing surface 26. In addition, the 1st clamp 51 arrange | positioned in the center part of the gas non-passing surface 24 among the 1st clamps 50-52 and the 1st clamp arrange | positioned in the center part of the gas non-passing surface 26 among the 2nd clamps 53-55. The two clamps 54 have a function as an electrically conductive member that is electrically connected to the discharge electrode 34 in addition to the function of sandwiching each electrode panel 30 in the stacking direction. On the other hand, among the first clamps 50 to 52, the first clamps 50 and 52 disposed on both sides of the gas non-passing surface 24 and the second clamps 53 to 55 are disposed on both sides of the gas non-passing surface 26. The second clamps 53 and 55 have only a function of sandwiching each electrode panel 30 in the stacking direction.

  As shown in FIGS. 7 and 8, each of the clamps 50 to 55 includes a clamp body 56 and a pressing plate 57. The clamp body 56 extends in the stacking direction of the electrode panels 30. The holding plate 57 is formed integrally with the clamp body 56 and is disposed at both ends of the clamp body 56. Each pressing plate 57 is a leaf spring having elasticity and a folded structure. Note that the pressing plates 57 constituting the clamps 50 to 55 are in pressure contact with the gas non-passing surface 23 and the gas non-passing surface 25 of the plasma panel laminate 20, respectively. The pressing plates 57 constituting the clamps 51 and 54 are provided with a first pad 42 formed on the gas non-passing surface 23 (the first main surface 31 of the uppermost electrode panel 30) and the gas non-passing surface 25 ( It is in pressure contact with the second pad 43 formed on the second main surface 32) of the lowermost electrode panel 30.

  As shown in FIGS. 2 to 8, the plasma reactor 1 includes a pair of external terminals 60 and 61. The external terminals 60 and 61 of this embodiment have the same structure as a spark plug. More specifically, the external terminals 60 and 61 include an external connection portion, a conductive seal containing metal powder, an insulator, a metal shell, talc, packing, and the like. The external connection portion is connected to the middle shaft 62 via a conductive seal. The external terminal is not limited to the one in the present embodiment, and may have another structure as long as the external connection portion and the case 10 are insulated by an insulator.

  In addition, the external terminal 60 is electrically connected to the clamp main body 56 of the first clamp 51 at the proximal end portion, and the distal end portion is exposed from the case 10 (see FIGS. 2 to 4). Similarly, the external terminal 61 is electrically connected to the clamp main body 56 of the second clamp 54 at the proximal end portion, and the distal end portion is exposed from the case 10. That is, the external terminal 60 is disposed on the gas non-passing surface 24 of the plasma panel laminate 20, and the external terminal 61 is disposed on the gas non-passing surface 26 located on the opposite side of the gas non-passing surface 24. The external terminals 60 and 61 protrude in opposite directions. In the present embodiment, the tip of the external terminal 60 is connected to the first wiring 6 (see FIG. 1), and the tip of the external terminal 61 is connected to the second wiring 7 (see FIG. 1). It has become so.

  As shown in FIGS. 3 to 6, a mat 71 having a rectangular ring shape when viewed from the side is interposed between the case 10 and the plasma panel laminate 20. The mat 71 has a function of fixing the plasma panel laminate 20 to the case 10. Further, the mat 71 covers the outer surface of the plasma panel laminate 20. Specifically, the mat 71 includes a substantially rectangular plate-shaped first mat piece 72 covering the gas non-passing surface 23, a substantially rectangular plate-shaped second mat piece 73 covering the gas non-passing surface 24, and a gas non-passing surface. 25, a third mat piece 74 having a substantially rectangular plate shape covering 25, and a fourth mat piece 75 having a substantially rectangular plate shape covering the gas non-passing surface 26. The mat 71 is configured by bonding the mat pieces 72 to 75 to each other using an adhesive tape or the like as necessary. Here, as a material constituting the mat 71, for example, an insulating material such as ceramic fiber, metal fiber, and foam metal can be used.

  As shown in FIGS. 5 and 6, the plasma reactor 1 of the present embodiment has a gap between the mat 71 and the clamps 50 to 55. In the mat 71 of the present embodiment, three first notches 81 penetrating the mat 71 in the thickness direction are formed, and three second notches 82 penetrating the mat 71 in the thickness direction are formed. Has been. The first clamps 50, 51, 52 are located in the inner regions of the first notches 81, and the second clamps 53, 54, 55 are located in the inner regions of the second notches 82, respectively. It has become.

  More specifically, the first notch 81 includes a first groove 83 that penetrates the second mat piece 73 in the thickness direction and a pair of first recesses 84 that respectively penetrate the mat pieces 72 and 74 in the thickness direction. ing. The first groove 83 extends along the stacking direction of the electrode panel 30 and divides the second mat piece 73. On the other hand, the 1st recessed part 84 is formed only in a part of outer peripheral part of the mat pieces 72 and 74, and the mat pieces 72 and 74 are not divided. In the first groove 83, the clamp body 56 of the first clamps 50 to 52 and the center shaft 62 connected to the proximal end portion of the external terminal 60 are disposed, and in the first recess 84, the first clamp 50 to 52 pressing plates 57 are arranged.

  As shown in FIG. 5, in the plasma reactor 1 of the present embodiment, between the mat 71 and the first clamps 50 to 52 (specifically, the inner wall surface of the first groove 83 and the clamp body 56). A first gap S <b> 1 is provided between the side edges and between the inner side surface of the first recess 84 and the outer peripheral edge of the pressing plate 57. The magnitude | size of 1st clearance gap S1 is set to 0.5 mm or more and 30 mm or less (5 mm in this embodiment at the minimum).

  As shown in FIGS. 5 and 6, the second notch portion 82 includes a second groove portion 85 that penetrates the fourth mat piece 75 in the thickness direction, and a pair that penetrates the mat pieces 72 and 74 in the thickness direction. The second recess 86. The second groove 85 extends along the stacking direction of the electrode panel 30 and divides the fourth mat piece 75. On the other hand, the second recess 86 is formed only in a part of the outer peripheral portion of the mat pieces 72 and 74 so that the mat pieces 72 and 74 are not divided. A clamp body 56 of the second clamps 53 to 55 and a middle shaft 62 connected to the proximal end portion of the external terminal 61 are disposed in the second groove 85, and the second clamp 86 has a second clamp 86. 53 to 55 pressing plates 57 are arranged.

  In the plasma reactor 1 of the present embodiment, between the mat 71 and the second clamps 53 to 55 (specifically, between the inner wall surface of the second groove 85 and the side edge of the clamp body 56, and A second gap S <b> 2 is provided between the inner side surface of the second recess 86 and the outer peripheral edge of the pressing plate 57. The size of the second gap S2 is equal to the size of the first gap S1, and is set to 0.5 mm or more and 30 mm or less (in this embodiment, 5 mm at the minimum).

  Furthermore, as shown in FIGS. 4 and 5, the plasma reactor 1 of the present embodiment has a gap between the case 10 and the clamps 50 to 55 in addition to the gap between the mat 71 and the clamps 50 to 55. Have. More specifically, the mat 71 has a thickness of 8 mm, and the clamps 50 to 55 have a thickness of 0.5 mm. Therefore, between the case 10 and the first clamps 50 to 52 (specifically, between the inner surface of the case 10 and the surface of the clamp body 56 of the first clamps 50 to 52, and between the inner surface of the case 10 and the first clamp 50-52). A first gap S3 is provided between the surface of the pressing plate 57 of each clamp 50-52. Furthermore, between the case 10 and the second clamps 53 to 55 (specifically, between the inner surface of the case 10 and the surface of the clamp body 56 of the second clamps 53 to 55, and between the inner surface of the case 10 and the second clamp A second gap S4 is provided between the surfaces of the clamp plates 53 to 55 and the pressing plate 57. In addition, the size of the gaps S3 and S4 in this embodiment is about 7.5 mm.

  As shown in FIG. 1, the plasma reactor 1 of the present embodiment is used, for example, to remove PM contained in exhaust gas. In this case, when a pulse voltage (for example, peak voltage: 5 kV (5000 V), pulse repetition frequency: 100 Hz) is applied between the electrode panels 30 adjacent to each other from the pulse generating power supply 3, dielectric barrier discharge occurs, and the discharge electrode 34 generates plasma due to dielectric barrier discharge. Due to the generation of plasma, PM contained in the exhaust gas flowing between the discharge electrodes 34 is oxidized (burned) and removed.

  Next, a method for manufacturing the plasma reactor 1 will be described.

  First, the 1st-3rd ceramic green sheet used as the dielectric material 33 is formed using the ceramic material which has an alumina powder as a main component. In addition, as a formation method of a ceramic green sheet, well-known shaping | molding methods, such as tape shaping | molding and extrusion molding, can be used. And each ceramic green sheet is laser-processed and a through-hole is formed in a predetermined position. The through hole may be formed by punching, drilling, or the like.

  Next, using a conventionally known paste printing apparatus (not shown), the through holes of each ceramic green sheet are filled with a conductive paste (in this embodiment, a tungsten paste), and an unfired portion that becomes the through-hole conductor 41 is obtained. A through-hole conductor is formed.

  Next, the first ceramic green sheet is placed on a support base (not shown). Furthermore, a conductive paste is printed on the back surface of the first ceramic green sheet using a paste printing apparatus. As a result, an unsintered electrode having a thickness of 10 μm to be the discharge electrode 34 is formed on the back surface of the first ceramic green sheet. In addition, as a printing method of the unsintered electrode with respect to the 1st ceramic green sheet, well-known printing methods, such as screen printing, can be used.

  Then, after drying the conductive paste, the second ceramic green sheet and the third ceramic green sheet are sequentially laminated on the back surface of the first ceramic green sheet on which the unfired electrodes are printed, and in the sheet lamination direction. Apply pressing force. As a result, the ceramic green sheets are integrated to form a ceramic laminate. Further, using a paste printing device, a conductive paste is printed on the main surface of the first ceramic green sheet to form the unfired first pad 42 and conductive on the back surface of the third ceramic green sheet. The non-sintered second pad 43 is formed by printing the conductive paste. The third ceramic green sheet is laminated after being subjected to a punching process that matches the shape of the recess 35.

  Next, after performing a drying process, a degreasing process, and the like according to a well-known method, a predetermined temperature (for example, about 1400 ° C. to 1600 ° C.) at which the ceramic laminate (ceramic green sheet and green electrode) can be sintered by alumina and tungsten. ) Is simultaneously fired. As a result, alumina in the ceramic green sheet and tungsten in the conductive paste are simultaneously sintered, and the dielectric 33, the discharge electrode 34, the through-hole conductor 41, the first pad 42, and the second pad 43 are simultaneously fired. The formed ceramic laminate becomes the electrode panel 30.

  Thereafter, a plurality of obtained electrode panels 30 are laminated to form a plasma panel laminate 20. Next, the clamps 50 to 55 are used to sandwich and fix the plurality of electrode panels 30 in the stacking direction. At this time, the pair of pressing plates 57 constituting the clamps 51 and 54 are in pressure contact with the first pad 42 and the second pad 43. Further, by performing welding or the like, the proximal end portion of the external terminal 60 is connected to the clamp body 56 constituting the first clamp 51 via the middle shaft 62, and the middle shaft 62 is connected to the clamp body 56 constituting the second clamp 54. The base end of the external terminal 61 is connected via Next, after attaching the mat 71 so as to cover the outer surface of the plasma panel laminate 20, the case 10 is attached so as to cover the outer surface of the mat 71. Thereafter, the first wiring 6 is connected to the distal end portion of the external terminal 60, and the second wiring 7 is connected to the distal end portion of the external terminal 61. The plasma reactor 1 is completed through the above processes.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the plasma reactor 1 of the present embodiment, the gaps S1 and S2 are provided between the mat 71 and the clamps 50 to 55, and the gaps S3 and S4 are provided between the case 10 and the clamps 50 to 55. Yes. For this reason, even when a stress caused by a difference in thermal expansion between the case 10 and the plasma panel laminate 20 occurs when high-temperature exhaust gas flows in, stress is applied from the mat 71 and the case 10 to the clamps 50 to 55. Since it becomes difficult to act, the deformation | transformation and destruction of the clamps 50-55 are suppressed. Therefore, the reliability of the plasma reactor 1 can be improved.

  (2) In the present embodiment, the notches 81 and 82 are formed on the mat 71 so as to avoid the clamps 50 to 55, thereby providing the gaps S1 and S2 between the mat 71 and the clamps 50 to 55. Yes. For this reason, for example, the number of parts of the plasma reactor 1 can be reduced as compared with the case where a gap is provided between the mat and the clamp by arranging clamps between the plurality of mats.

  (3) The plasma reactor 1 of this embodiment is attached to the exhaust pipe 2 via the first cone portion 11 and the second cone portion 12. As a result, the resistance in the exhaust gas flow path in which the exhaust gas flows in the order of the upstream portion 4 of the exhaust pipe 2 → the first cone portion 11 → the plasma reactor 1 → the second cone portion 12 → the downstream portion 5 of the exhaust pipe 2 is reduced. Therefore, the pressure loss in the exhaust gas passage can be suppressed. As a result, it is possible to prevent the engine output from decreasing due to pressure loss.

  In addition, you may change the said embodiment as follows.

  In the above embodiment, the notches 81 and 82 are formed in the mat 71, and the clamps 50 to 55 are positioned in the inner region of the notches 81 and 82, whereby the gap S1 is provided between the mat 71 and the clamps 50 to 55. , S2 is provided, but a gap may be provided by another structure. For example, as shown in FIGS. 10 and 11, the four mats 91, 92, 93, 94 are arranged apart from each other, thereby completely dividing each mat 91-94, and adjacent mats 91-94. You may make it provide the clearance gap S5 between the mats 91-94 and the clamps 95 and 96 by arrange | positioning the clamps 95 and 96 between them. Further, a clamp relief portion (not shown) may be provided on the inner surface of the mat between the area in contact with the clamp and a gap may be generated between the mat and the clamp.

  In the plasma reactor 1 of the above embodiment, the gaps S1 and S2 are provided between the inner side surfaces of the notches 81 and 82 and the outer peripheral edges of the clamps 50 to 55. However, the gaps S1 and S2 are omitted, and the notches The inner side surfaces of the portions 81 and 82 and the outer peripheral edges of the clamps 50 to 55 may be brought into contact with each other.

  The mat 71 of the above embodiment is configured by joining a plurality of mat pieces 72 to 75 to each other using an adhesive tape or the like, if necessary. However, the mat 71 is configured by using other methods. May be. For example, as shown in FIG. 12, the mat 100 is configured by fitting the convex portion 102 provided on the outer peripheral portion of the mat piece 101 into the concave portion 104 formed on the outer peripheral portion of the adjacent mat piece 103. Also good.

  The plasma reactor 1 of the above embodiment has the gaps S1 and S2 between the mat 71 and the clamps 50 to 55, and the gaps S3 and S4 between the case 10 and the clamps 50 to 55. However, the plasma reactor may have a gap only between the case 10 and the clamps 50 to 55. More specifically, for example, as shown in FIG. 13, a relief recess 112 is provided on the inner surface of the case 111, and between the case 111 and the area where the mat 113 contacts the clamp 114, that is, the case 111 and the clamp 114. You may make it produce gap S6 between. Further, as shown in FIG. 14, the area A1 corresponding to the clamp 122 in the mat 121 is formed thinner than the other areas, so that the area between the case and the mat 121, that is, between the case and the clamp 122. You may make it provide a clearance gap in.

  -The electrode panel 30 of the said embodiment was comprised by incorporating the discharge electrode 34 in the dielectric material 33. FIG. However, the electrode panel may be configured by forming the discharge electrode 34 on the surface of the dielectric 33.

  -Although the plasma reactor 1 of the said embodiment was used for the exhaust gas purification of the engine of a motor vehicle, you may use it for exhaust gas purification, such as a ship, for example. Moreover, the plasma reactor 1 should just perform a plasma process, and does not need to perform the process of waste gas, and does not need to be used for purification | cleaning.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.

  (1) In the above means 1, the mat has a notch that penetrates the mat in the thickness direction, the clamp is located in an inner region of the notch, and the notch has the plurality of notches A plasma reactor, wherein the plasma reactor extends along a direction in which the electrode panels are stacked.

  (2) In the above means 1, a plurality of the mats are arranged apart from each other, and the clamp is located between the adjacent mats.

  (3) In the above means 1, the plasma reactor is characterized in that the mat covers the outer surface of the plasma panel laminate.

  (4) In the above means 1, the electrode panel has a first main surface and a second main surface, and the first main surface side and the second main surface side are electrically connected to the electrode panel. A conduction structure is provided, and the conduction structure is formed in the first main surface and the through hole conductor penetrating the first main surface and the second main surface, and the first main surface side of the through hole conductor. A first pad that is electrically connected to the end, and a second pad that is formed on the second main surface and is electrically connected to the end of the through-hole conductor on the second main surface. A plasma reactor characterized by.

DESCRIPTION OF SYMBOLS 1 ... Plasma reactor 10, 111 ... Case 20 ... Plasma panel laminated body 30 ... Electrode panel 34 ... Discharge electrode 50, 51, 52 ... 1st clamp 53, 54, 55 as a clamp ... 2nd clamp 71, 91 as a clamp , 92, 93, 94, 100, 113, 121... Mat 81... First notch 82 as a notch. Second notch 95, 96, 114, 122... Clamp 112. Region S1, S3 corresponding to the clamp in the first gap S2, S4 as the gap second gaps S5, S6 as the gap

Claims (5)

A plasma panel laminate having a structure in which a plurality of electrode panels having discharge electrodes are laminated, and generating plasma by applying a voltage between the adjacent electrode panels;
A clamp that sandwiches and fixes the plurality of electrode panels from the outside;
A case for accommodating the plasma panel laminate;
A plasma reactor comprising a mat interposed between the case and the plasma panel laminate and holding the plasma panel laminate,
A plasma reactor comprising a gap in at least one of the mat and the clamp and between the case and the clamp.   The plasma reactor according to claim 1, wherein the clamp has the gap between the clamp and the mat.   3. The plasma reactor according to claim 1, wherein the mat has a notch that passes through the mat in the thickness direction, and the clamp is located in an inner region of the notch.   3. The plasma reactor according to claim 1, wherein an escape recess for generating the gap is provided on an inner surface of the case between the mat and a region in contact with the clamp. 4.   3. The plasma according to claim 1, wherein a region corresponding to the clamp in the mat is formed to be thinner than other regions, thereby having the gap between the case and the case. Reactor.

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