JP2017057843A - Filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter device capable of efficiently removing soot.SOLUTION: A filter device includes: a ceramic filter having a first end becoming an inflow side of exhaust gas of an engine and a second end becoming an outflow side of the exhaust gas, which has a plurality of first hole portions extending from the first end toward the second end up to a part right before the second end, and a plurality of second hole portions extending from the second end toward the first end up to a part right before the first end, in an opposite direction to the first hole portions; particulate or wire-shaped metallic members, which are provided on inner walls of the first hole portions and the second hole portions; and a microwave radiating portion which is arranged on an outside surface of the filter or on an outer side than the outside surface, and radiates microwaves toward the inside of the filter.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a filter device.

  Conventionally, plasma is generated by a plasma generator provided in a flow path of exhaust gas from an engine, nitrogen components in the exhaust gas are turned into plasma to generate nitrogen dioxide, and graphite fine particles in the exhaust gas are oxidized and burned There is a processing method for engine exhaust gas (see, for example, Patent Document 1).

  Further, this Patent Document 1 describes the following engine exhaust gas treatment apparatus. A device for treating exhaust gas discharged from an engine, which is provided on the upstream side with respect to the flow direction of the exhaust gas, introduces a gas containing nitrogen and oxygen, and generates a plasma to generate an engine exhaust gas including a plasma generator. It is a processing device. The engine exhaust gas treatment device is further provided in a treatment gas merging portion for merging the treatment gas that has passed through the plasma generator into the flow of the exhaust gas, and a wake of the treatment gas merging portion. And a filter that collects black smoke fine particles (see, for example, Patent Document 1).

JP 2003-201825 A

  By the way, the conventional processing method of engine exhaust gas converts nitrogen component in exhaust gas into plasma to generate nitrogen dioxide and oxidizes and burns graphite fine particles in exhaust gas. The method for removing 煤) has a complicated structure and is not necessarily an efficient method for removing graphite fine particles (煤).

  Then, it aims at providing the filter apparatus which can remove a wrinkle efficiently.

  A filter device according to an embodiment of the present invention is a ceramic filter having a first end that becomes an exhaust gas inflow side of an engine and a second end that becomes an outflow side of the exhaust gas. A plurality of first holes extending from the end toward the second end and before the second end; and the first hole from the second end toward the first end and before the first end. A filter having a plurality of second holes extending alternately with the part, a particulate or wire-shaped metal member provided on the inner wall of the first hole and the second hole, and the filter A microwave radiating portion disposed outside the outer surface or the outer surface and radiating microwaves toward the inside of the filter.

  It is possible to provide a filter device that can efficiently remove wrinkles.

It is a figure showing filter device 100 of an embodiment. It is a figure showing filter device 100 of an embodiment. It is a figure which shows arrangement | positioning and a structure of the hole part 111 and the hole part 112. FIG. It is a figure which shows arrangement | positioning and a structure of the hole part 111 and the hole part 112. FIG. It is a figure which shows the area | region where the volume occupation rates of the metal wires 115 and 116 in the filter 110 differ. It is a figure which shows the state which connected the antenna 130 to the high frequency generation part 200. FIG. It is a figure which shows the relationship between the reflectance of the microwave with respect to the volume occupation rate of the metal wires 115 and 116, and the transmittance | permeability.

  Embodiments to which the filter device of the present invention is applied will be described below.

<Embodiment>
FIG.1 and FIG.2 is a figure which shows the filter apparatus 100 of embodiment.

  The filter device 100 includes a filter 110, a cover 120, and an antenna 130. As an example, the filter device 100 is a device that purifies exhaust gas from a diesel engine, and is inserted in series into an exhaust pipe that exhausts exhaust gas from the diesel engine.

  The filter 110 is a cylindrical and porous ceramic member, and has a plurality of holes 111 and a plurality of holes 112. The filter 110 may be formed of, for example, a ceramic made of silicon carbide (SiC).

  The filter 110 has one surface 110A (see FIG. 1), the other surface 110B (see FIG. 2), and a side surface 110C. One surface 110A and the other surface 110B are both circular, and the side surface 110C has a shape of a side surface of a cylindrical body (a shape obtained by curving a rectangle in an annular shape).

  The hole 111 extends along the Y-axis direction from the opening formed on one surface 110A of the filter 110 toward the other surface 110B, and is closed before the other surface 110B. The extending direction (Y-axis direction) of the hole 111 is equal to the direction in which the cylindrical central axis of the filter 110 extends.

  The shape of the cross section perpendicular to the extending direction of the hole 111 is, for example, a square. A cross section perpendicular to the extending direction of the hole 111 is a cross section parallel to the XZ plane. The plurality of holes 111 are arranged at positions of white squares in which a plurality of white squares and a plurality of black squares are arranged in a checkered pattern in an XZ plan view, and are formed in one surface 110A. It extends from this part to the front of the other surface 110B.

  The cross-sectional shape perpendicular to the extending direction of the hole 112 is, for example, a square. A cross section perpendicular to the extending direction of the hole 112 is a cross section parallel to the XZ plane. The plurality of holes 112 are arranged at the positions of the black squares of the plurality of white squares and the plurality of black squares arranged in a checkered pattern in the XZ plan view, and are formed in the other surface 110B. It extends from the portion to the front of one surface 110A.

  As described above, the plurality of hole portions 111 and the plurality of hole portions 112 are arranged in a nested manner, and are alternately arranged so as not to overlap or contact in three dimensions. The filter device 100 is inserted in series between the first section and the second section of the exhaust pipe that discharges exhaust gas from the diesel engine. The first section is a section closer to the diesel engine than the second section.

  Exhaust gas discharged from the first section flows into the plurality of holes 111. That is, the plurality of holes 111 are located on the inflow side into which the exhaust gas flows. Further, the plurality of holes 112 discharge the exhaust gas purified by the filter device 100 to the second section of the exhaust pipe. That is, the plurality of holes 112 are positioned on the outflow side from which the exhaust gas flows out.

  The exhaust gas that has flowed into the plurality of holes 111 passes through the porous holes of the filter 110 between the plurality of holes 111 and the plurality of holes 112 and flows out from the plurality of holes 112.

  As an example, the dimension of the hole 111 in the XZ plan view is 1 mm per side, and this is the same for the hole 112. As an example, the distance between the hole 111 and the hole 112 in the X-axis direction and the Z-axis direction is 300 μm.

  Moreover, what is necessary is just to set the diameter in the XZ planar view of the filter 110, and the length of a Y-axis direction to an appropriate value according to the displacement of a diesel engine using the filter apparatus 100, a use, or the like.

  In addition, the catalyst and metal member which are arrange | positioned inside the some hole part 111 and the some hole part 112 are later mentioned using FIG.3 and FIG.4.

  The cover 120 is a cylindrical dielectric member, and is arranged concentrically with the columnar filter 110 at a position spaced from the side surface 110C of the filter 110 by an XZ plan view. Further, the length of the cover 120 in the Y-axis direction is the same as that of the filter 110 as an example.

  An antenna 130 is disposed on the outer peripheral surface of the cover 120. The cover 120 is provided to arrange the antenna 130 on the outer periphery of the filter 110. Note that a distance between the inner peripheral surface of the cover 120 and the side surface 110C of the filter 110 may be, for example, about several millimeters. Further, the inner peripheral surface of the cover 120 and the side surface 110C of the filter 110 may be in close contact with each other.

  A plurality of antennas 130 are provided on the outer peripheral surface of the cover 120. The plurality of antennas 130 are arranged at equal intervals on the outer peripheral surface of the cover 120 in the circumferential direction and the Y-axis direction. The antenna 130 is an example of a microwave radiating unit.

  1 and 2 show an example in which four antennas 130 are arranged at 90 ° intervals in the circumferential direction of the cover 120 and four antennas 130 are arranged at equal intervals in the Y-axis direction of the cover 120 as an example. Although eight antennas 130 behind the cover 120 are not shown, the sixteen antennas 130 are arranged on the outer peripheral surface of the cover 120 at equal intervals.

  The antenna 130 is a patch antenna. The antenna 130 may be made of metal such as copper or aluminum, and can be realized with a thin metal foil. The antenna 130 is connected to a microwave power source (not shown), and radiates a microwave whose electric field is converted in the circumferential direction of the outer peripheral surface of the cover 120 or in the Y-axis direction.

  Here, in order to describe a mode in which the antenna 130 is a patch antenna that radiates microwaves, the length of one side of the square antenna 130 in plan view is an electrical length and is a half wavelength of the microwave wavelength (λ). What is necessary is just to set to ((lambda) / 2). The length of one side may be determined in consideration of the dielectric constants of the cover 120 and the filter 110. The frequency of the microwave is, for example, 2.45 GHz in an ISM (Industry-Science-Medical) band, but may be a frequency other than this. The microwave is an electromagnetic wave having a frequency of about 300 MHz to about several tens of GHz, for example.

  Here, a mode in which 16 antennas 130 are arranged on the outer peripheral surface of the cover 120 at equal intervals will be described. However, the number and positions of the antennas 130 are determined according to the size of the filter 110 and the inside of the filter 110. What is necessary is just to set suitably according to the distribution etc. of the microwave.

  Further, the antenna 130 may be any antenna that can radiate microwaves toward the inside of the filter 110, and thus is not limited to a patch antenna. As the antenna 130, a slot antenna, a dipole antenna, or a monopole antenna may be used.

  3 and 4 are diagrams showing the arrangement and configuration of the hole 111 and the hole 112. FIG.

  FIG. 3A shows one surface 110 </ b> A of the filter 110. In FIG. 3A, the hole 111 that appears on one surface 110A is indicated by a solid line, and the hole 112 that does not appear on one surface 110A is indicated by a broken line.

  FIG. 4A shows the other surface 110B of the filter 110. FIG. In FIG. 4A, the hole 112 that appears on the other surface 110B is indicated by a solid line, and the hole 111 that does not appear on the other surface 110B is indicated by a broken line.

  As shown in FIGS. 3A and 4A, the hole 111 and the hole 112 are arranged so as to construct a checkered pattern.

  FIG. 3B is a perspective perspective view showing part of the holes 111 and part of the holes 112. FIG. 3C shows a cross section parallel to the XZ plane along the Y-axis direction of the hole 111.

  Similarly, FIG. 4B shows a perspective view of a part of the holes 112 and a part of the holes 111. FIG. 4C shows a cross section parallel to the XZ plane along the Y-axis direction of the hole 112.

  FIGS. 3B and 4B show a portion of 3 rows and 3 columns in which five holes 111 and four holes 112 are arranged in a checkered pattern. About the shape of the hole part 111 and the hole part 112, only one each is shown with a broken line.

  The hole 111 extends in the Y-axis direction from the opening 111A formed on the one surface 110A, and is closed by the wall 111B. The hole 112 extends in the Y-axis direction from an opening 112A formed in the other surface 110B, and is closed by the wall 112B.

  Further, as shown in FIG. 3C, catalyst particles 113 are applied to the inner wall 111D of the hole 111, and the catalyst particles 113 are formed on five surfaces (four surfaces extending in the Y-axis direction) of the inner wall 111D. , 5 surfaces with the front surface of the wall 111B).

  As shown in FIG. 4C, catalyst particles 114 are applied to the inner wall 112D of the hole 112, and the catalyst particles 114 have five surfaces (four surfaces extending in the Y-axis direction) and the inner wall 112D. , 5 surfaces with the front surface of the wall portion 112B).

  The catalyst particles 113 and 114 are made of, for example, platinum, and oxidize carbon monoxide contained in the exhaust gas of the diesel engine to convert it into carbon dioxide. Further, the catalyst particles 113 and 114 oxidize nitric oxide and convert it into nitrogen dioxide. The catalyst particles 113 and 114 are an example of a catalyst part.

  The catalyst particles 113 can be formed, for example, by applying a solution (slurry) prepared by dispersing platinum particles in an organic solvent such as toluene or water to the inner wall 111D. Similarly, the catalyst particles 114 can be formed, for example, by applying a solution (slurry) prepared by dispersing platinum particles in an organic solvent such as toluene or water to the inner wall 112D.

  Further, as shown in FIG. 3C, a minute metal wire 115 is disposed on the catalyst particle 113 on the inner wall 111D of the hole 111, and as shown in FIG. A fine metal wire 116 is disposed on the catalyst particles 114 on the inner wall 112D of 112.

  The metal wires 115 and 116 are minute wires on the order of micrometers (μm) or nanometers (nm), and are made of, for example, iron or copper. The metal wires 115 and 116 are examples of metal members.

  The metal wires 115 and 116 are provided to reflect or transmit microwaves radiated from the antenna 130 toward the inside of the filter 110.

  The metal wire 115 is provided on the catalyst particle 113 on the five surfaces of the inner wall 111D, and the metal wire 116 is provided on the catalyst particle 114 on the five surfaces of the inner wall 112D.

  The metal wire 115 can be formed, for example, by applying a slurry in which the metal wire 115 is dispersed in water on the catalyst particles 113. Similarly, the metal wire 116 can be formed, for example, by applying a slurry in which the metal wire 116 is dispersed in water onto the catalyst particles 114.

  FIG. 5 is a diagram showing regions in which the volume occupation ratios of the metal wires 115 and 116 in the filter 110 are different. 5A shows one surface 110A, and FIG. 5B shows the other surface 110B.

  The volume occupancy of the metal wires 115 and 116 positioned inside the broken line A shown in FIGS. 5A and 5B is outside the broken line A shown in FIGS. 5A and 5B. It is set higher than the volume occupation ratio of the metal wires 115 and 116 located in the area.

  Here, among the regions inside the filter 110, the inner side from the broken line A is referred to as a region I, and the outer side from the broken line A is referred to as a region II.

  In the region I inside the broken line A, the volume occupancy of the metal wires 115 and 116 is made larger than that in the region II, so that the microwave radiated from the antenna 130 to the inside of the filter 110 becomes difficult to enter the region I. I am doing so.

  In other words, the microwave radiated from the outside to the inside of the filter 110 is returned to the region II by increasing the probability of being reflected by the metal wires 115 and 116 in the region I.

  Further, in the region II outside the broken line A, the volume occupancy of the metal wires 115 and 116 is made smaller than that in the region I, so that the microwaves are reflected by the metal wires 115 and 116 and the microwaves are Transmission of the wires 115 and 116 occurs, so that the microwave propagates efficiently throughout the region II.

  In other words, microwaves radiated from the outside to the inside of the filter 110 are concentrated inside the region II.

  The reason for concentrating the microwave in the region II in this way is as follows.

  In the purification process for periodically purifying the filter 110, if the fuel is burned, the temperature of the central part is sufficiently high and soot is decomposed, but the temperature does not rise sufficiently outside the central part. The soot may remain without being decomposed. Such a purification process is performed to regenerate the filter 110 in which soot is accumulated.

  In the filter device 100 of the embodiment, the microwaves are concentrated in the region II where it is relatively difficult to remove the soot in the regeneration process, and the soot is removed by the microwave. This is because the soot stored in the region II of the filter 110 is decomposed by microwaves, which may not be completely decomposed by the regeneration process in which the fuel is used for combustion. The soot is exhaust particulates contained in the exhaust gas of the diesel engine, and is black smoke particulates or graphite particulates.

  In the region I and the region II, the volume occupation ratios of the metal wires 115 and 116 are different. As described above, the region I and the region II in which the volume occupancy of the metal wires 115 and 116 are different may be formed by separately applying slurry having different contents of the metal wires 115 and 116. The slurry may be applied by pouring the slurry into the holes 111 and 112.

  For example, a slurry containing a large amount of the metal wires 115 and 116 may be applied to the inside of the holes 111 and 112 in the region I while the holes 111 and 112 in the region II are covered with a mask or the like. In addition, a slurry containing a small amount of the metal wires 115 and 116 may be applied to the inside of the holes 111 and 112 in the region II while the holes 111 and 112 in the region I are covered with a mask or the like.

  By performing such coating separately, the volume occupation ratio of the metal wires 115 and 116 inside the holes 111 and 112 in the region I can be made larger than that in the region II.

  FIG. 6 is a diagram illustrating a state in which the antenna 130 is connected to the high frequency generator 200. The filter device 100 includes 16 antennas 130, some of which are shown in FIG. The sixteen antennas 130 are connected in parallel to the high-frequency generator 200 via coaxial cables, microstrip lines, or the like. In FIG.

  The antenna 130 shown in FIG. 6 is a patch antenna. The antenna 130 is fed from a feeding point 131 by the high frequency generator 200. The antenna 130 is a rectangular metal foil in plan view, and radiates microwaves in the thickness direction of the metal foil.

  The high frequency generator 200 generates an electromagnetic wave of 200 MHz to 300 GHz, more preferably a microwave (300 MHz to 300 GHz), which becomes a high frequency electromagnetic wave. The frequency of the electromagnetic wave generated by the high frequency generator 200 is, for example, 300 to 10 GHz from the viewpoint of the output performance of the current amplifier, but is not limited to that range. The high frequency generator 200 is configured using, for example, a semiconductor element or magnetron formed of GaN or the like.

  If all the antennas 130 are connected to the high frequency generator 200 and microwaves are radiated from the antennas 130 to the filter 110 (see FIGS. 1 to 5), the microwaves can be concentrated in the region II (see FIG. 5). The soot stored in the holes 111 and 112 in the region II can be disassembled. Soot is broken down into carbon dioxide and water vapor.

  The high frequency generator 200 may be mounted on a vehicle, a ship, a construction machine, or the like on which the filter device 100 is mounted, and used when the soot is decomposed by microwaves.

  The high frequency generator 200 may not be mounted on a vehicle or the like. For example, the high frequency generator 200 may be installed in a service factory or the like, and connected to the antenna 130 when the vehicle or the like is received, The decomposition process may be performed.

  FIG. 7 is a diagram illustrating the relationship between the reflectance and transmittance of the microwave with respect to the volume occupation ratio of the metal wires 115 and 116.

  The horizontal axis represents the volume occupation ratio, and the vertical axis represents the transmittance and reflectance of the microwave power input from the antenna 130 to the filter 110. Note that the vertical axis indicates the transmittance and the reflectance as values normalized by the power input from the antenna 130 to the filter 110 (normalized power).

  As shown in FIG. 7, the transmittance and reflectance of the microwave change depending on the volume occupancy of the metal wires 115 and 116.

  As an example of the material of the metal wires 115 and 116, investigation was performed on the assumption that iron or copper was used. For this reason, in FIG. 7, the result calculated | required about iron (Fe) is shown as a continuous line, and the result calculated | required about copper (Cu) is shown with a broken line.

  Further, assuming that the conductivity is proportional to the density of the metal wires 115 and 116, an impedance equation expressed by the equation (1) and a reflection / transmission equation between the two media expressed by the equation (2) Was used to calculate the transmittance and reflectance of microwave power.

μ ₀ and ε ₀ indicate the permeability and dielectric constant in the air, respectively. σ is conductivity, and was set to 0 in air. In the metal wires 115 and 116, it was assumed that the conductivity was proportional to the density of the metal wires 115 and 116 as shown in the equation (3).

n is the volume occupancy of the metal wires 115 and 116, σ ₀ is the conductivity of the material of the metal wires 115 and 116, and ξ ₀ is the impedance in the air. Here, ξ ₀ was set to 120π. Further, Γ represents reflectance, and T represents transmittance. Note that T = 1 + Γ.

As can be seen from FIG. 7, in the region I, the microwave is almost reflected. If the volume occupancy is 1 × 10 ⁻⁵ or more, the microwave is reflected. The volume occupation ratio is 1 × 10 ⁻⁵ , for example, that the slurry including the metal wire 115 is 1 μm inside the hole 111 having a length of 1 mm in the X-axis direction and a length of 1 mm in the Z-axis direction. When applied in thickness, this corresponds to the condition that about 100 metal wires 115 having a diameter of 100 nm and a length of 10 μm exist in a slurry having a volume of 1 mm × 1 mm × 1 μm. The same applies to the case where the slurry containing the metal wire 116 is applied inside the hole 112.

   The volume occupancy can be adjusted by setting the size such as the diameter and length of the metal wires 115 and 116 and the density of the metal wires 115 and 116 mixed in the slurry.

Further, when the volume occupancy is 1 × 10 ⁻⁷ to 1 × 10 ⁻⁶ (substantially the same range as the region II), the reflectance and the transmittance are approximately the same. Such a volume occupancy is, for example, when a slurry containing a metal wire 115 is applied to a thickness of 1 μm inside a hole 111 having a length in the X-axis direction of 1 mm and a length in the Z-axis direction of 1 mm. This corresponds to the condition that about 30 metal wires 115 having a diameter of 20 nm and a length of 10 μm exist. The same applies to the case where the slurry containing the metal wire 116 is applied inside the hole 112.

If metal wires 115 and 116 distributed at a volume occupancy of 1 × 10 ⁻⁷ to 1 × 10 ⁻⁶ are applied to the inside of the holes 111 and 112 included in the region II of the filter 110, the region II is microwaved. Becomes an area where light is transmitted and reflected.

  Further, since the volume occupancy of the metal wires 115 and 116 in the holes 111 and 112 included in the region I is higher than the volume occupancy in the region I, the microwave is reflected near the boundary between the region I and the region II. Return to Region II.

  Therefore, the region II of the filter 110 becomes an environment in which microwaves are constantly irradiated, and the microwave energy can be efficiently applied to the soot.

Since the volume occupation ratio of the metal wires 115 and 116 formed in the region I is 1 × 10 ⁻⁵ or more, the concentration of the slurry is also set to a concentration of 1 × 10 ⁻⁵ or more. In the region II, a volume occupation ratio of 1 × 10 ⁻⁷ to 1 × 10 ⁻⁶ order is necessary. Therefore, if the slurry concentration is also set to a concentration of 1 × 10 ⁻⁷ to 1 × 10 ⁻⁶ or more. Good.

  The size and shape of the metal wires 115 and 116 may be nanowires having a diameter of 100 nm and a length of 10 μm in the region I, and may be nanowires having a diameter of 20 nm and a length of 10 μm in the region II. In addition, iron nanowires can be produced using, for example, a chemical vapor deposition (CVD) method.

  Moreover, the following effects can be expected by irradiating the metal wires 115 and 116 with microwaves. When a metal wire such as steel wool is placed in a microwave oven and irradiated with microwaves, a spark discharge occurs. A microwave oven heats an object by supplying energy to the object to be heated while the microwave generated from the magnetron is subjected to multiple reflections between the object to be heated and the side wall in the heating chamber.

  Inside the filter 110 of the filter device 100, the metal wires 115 and 116 corresponding to the steel wool installed in the microwave oven described above are exposed to an environment in which microwaves are multiple-reflected. Conceivable. For this reason, in the filter apparatus 100, it is expected that decomposition of soot is promoted by spark discharge.

  As described above, according to the embodiment, the volume occupancy ratio of the metal wires 115 and 116 provided inside the hole portions 111 and 112 in the region I on the center side of the filter 110 is set as the hole portion in the region II outside the filter 110. The volume occupancy is set to be larger than the volume occupancy of the metal wires 115 and 116 provided inside 111 and 112, respectively, and microwaves are irradiated from the outside of the filter 110.

  For this reason, the microwave is mainly concentrated inside the region II, and the transmission and reflection of the microwave are continuously performed inside the region II.

  Therefore, in the regeneration process performed by burning the fuel, the soot stored in the region II of the filter 110 that cannot completely remove soot can be efficiently decomposed by applying microwave energy.

  As described above, according to the embodiment, it is possible to provide the filter device 100 that can efficiently remove wrinkles.

  In the above, the volume occupancy of the metal wires 115 and 116 in the region I on the center side of the filter 110 is equal to the volume of the metal wires 115 and 116 in the region II outside the region I of the filter 110. A form larger than the occupation rate has been described. However, the volume occupancy of the metal wires 115 and 116 in the region I may be equal to the volume occupancy of the metal wires 115 and 116 in the region II. Even if they are equal, soot stored inside the region II can be efficiently decomposed by microwaves.

  Moreover, although the form which purifies the exhaust gas of a diesel engine was demonstrated, you may use for purification | cleaning of the exhaust gas of engines other than a diesel engine like a gasoline engine, for example.

  In the above description, the filter 110 has a cylindrical shape. However, the filter 110 allows exhaust gas to flow in from the first end and allows purified exhaust gas to flow out from the opposite second end. As long as it is a porous material having the holes 111 and 112, the outer shape may not be cylindrical.

  In the above description, the catalyst particles 113 and 114 are made of platinum, but may be a noble metal or metal having a catalytic action other than platinum.

  Moreover, although the form using the metal wires 115 and 116 has been described above, a particulate metal member may be used instead of the metal wires 115 and 116.

  In the above description, the antenna 130 is a patch antenna, a slot antenna, a dipole antenna, or a monopole antenna. However, instead of the antenna 130, a resonator that radiates microwaves, a waveguide, or the like May be used.

  In the above description, the 16 antennas 130 are arranged on the outer peripheral surface of the cover 120 at equal intervals. However, the position and number of the antennas 130 can sufficiently radiate microwaves inside the filter 110. If there is, it may be changed as appropriate.

The filter device of the exemplary embodiment of the present invention has been described above, but the present invention is not limited to the specifically disclosed embodiment, and does not depart from the scope of the claims. Various modifications and changes are possible.
Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A ceramic filter having a first end that becomes an exhaust gas inflow side of an engine and a second end that becomes an outflow side of the exhaust gas, the filter from the first end toward the second end. A plurality of first holes extending to the front of two ends, and a plurality of first holes extending alternately from the second end toward the first end to the front of the first end. A filter having two holes,
A particulate or wire-like metal member provided on the inner wall of the first hole and the second hole;
And a microwave radiating unit disposed outside the outer surface of the filter and disposed outside the outer surface and radiates microwaves toward the inside of the filter.
(Appendix 2)
The filter device according to appendix 1, wherein the metal member transmits or reflects the microwave inside the filter.
(Appendix 3)
In the cross section of the plurality of first holes and the plurality of second holes, the density of the metal member provided on the inner wall of the first hole and the second hole located on the center side is the cross section. The filter device according to appendix 1 or 2, wherein the density is higher than the density of the metal member provided on the inner wall of the first hole and the second hole located outside.
(Appendix 4)
A metal catalyst portion provided on inner walls of the first hole portion and the second hole portion;
The filter device according to any one of appendices 1 to 3, wherein the metal member is provided on the inner wall so as to overlap the catalyst portion.
(Appendix 5)
A cover covering the outer surface between the first end and the second end of the filter;
The filter device according to any one of appendices 1 to 4, wherein the microwave radiating unit is an antenna disposed on an outer surface of the cover.
(Appendix 6)
The filter device according to appendix 5, wherein the antenna is a patch antenna.
(Appendix 7)
The filter device according to any one of appendices 1 to 6, wherein the filter has a cylindrical shape.
(Appendix 8)
The filter device according to any one of appendices 1 to 7, wherein the filter is made of porous ceramic.
(Appendix 9)
The filter device according to appendix 8, wherein the first hole portion and the second hole portion communicate with each other through the porous filter.

DESCRIPTION OF SYMBOLS 100 Filter apparatus 110 Filter 111, 112 Hole part 110A One side 110B The other side 110C Side 113,114 Catalyst particle 115,116 Metal wire 120 Cover 130 Antenna 200 High frequency generating part

Claims (5)

A ceramic filter having a first end that becomes an exhaust gas inflow side of an engine and a second end that becomes an outflow side of the exhaust gas, the filter from the first end toward the second end. A plurality of first holes extending to the front of two ends, and a plurality of first holes extending alternately from the second end toward the first end to the front of the first end. A filter having two holes,
A particulate or wire-like metal member provided on the inner wall of the first hole and the second hole;
And a microwave radiating unit disposed outside the outer surface of the filter and disposed outside the outer surface and radiates microwaves toward the inside of the filter.   The filter device according to claim 1, wherein the metal member transmits or reflects the microwave inside the filter.   In the cross section of the plurality of first holes and the plurality of second holes, the density of the metal member provided on the inner wall of the first hole and the second hole located on the center side is the cross section. The filter device according to claim 1 or 2, wherein the density of the metal member provided on the inner wall of the first hole and the second hole located outside is higher than the density of the metal member. A metal catalyst portion provided on inner walls of the first hole portion and the second hole portion;
The filter device according to any one of claims 1 to 3, wherein the metal member is provided on the inner wall so as to overlap the catalyst portion. A cover covering the outer surface between the first end and the second end of the filter;
The filter device according to claim 1, wherein the microwave radiating unit is an antenna disposed on an outer surface of the cover.

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