WO2012014317A1 - 電気加熱式触媒 - Google Patents
電気加熱式触媒 Download PDFInfo
- Publication number
- WO2012014317A1 WO2012014317A1 PCT/JP2010/062914 JP2010062914W WO2012014317A1 WO 2012014317 A1 WO2012014317 A1 WO 2012014317A1 JP 2010062914 W JP2010062914 W JP 2010062914W WO 2012014317 A1 WO2012014317 A1 WO 2012014317A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mat
- case
- inner tube
- heating element
- water
- Prior art date
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- 239000003054 catalyst Substances 0.000 title claims abstract description 87
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 230000005611 electricity Effects 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 65
- 239000000463 material Substances 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 description 20
- 238000011144 upstream manufacturing Methods 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/10—Fibrous material, e.g. mineral or metallic wool
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an electrically heated catalyst.
- the present invention has been made in view of the above problems, and an object thereof is to suppress the flow of electricity to the case of the electrically heated catalyst.
- an electrically heated catalyst provides: A heating element that generates heat when energized; A case for housing the heating element; A mat provided between the heating element and the case for insulating electricity; An inner tube provided inside the case and outside the heating element, and supported by the mat while dividing the mat into the case side and the heating element side; With The inner tube protrudes from the mat; The distance between the inner tube and the case is a distance necessary to support the inner tube at the location where the mat is present, and the inner tube is located at a location where the inner tube protrudes from the mat. The distance is necessary to avoid the occurrence of discharge with the case.
- the heating element may be a catalyst carrier or may be provided upstream of the catalyst. Since the heating element generates heat by energizing the heating element, the temperature of the catalyst can be increased. Since the inner pipe divides the mat into the case side and the heating element side, there are places where the mat exists on the inner side and the outer side of the inner pipe. Further, since the inner tube is supported by the mat, the inner tube is not in contact with the heating element and the case.
- the water absorbed by the mat moves in the mat, but the movement of water from the case side to the heating element side is blocked by the inner tube. If it does so, the short circuit by water can be suppressed. Further, the water absorbed by the mat evaporates due to the heat of the exhaust and the heat of the heating element, so that it is removed over time. Further, by reducing the thickness of the mat, the amount of water absorbed by the mat can be reduced. Thereby, evaporation of water can be promoted. However, if the mat is too thin, it will be difficult to support the mat. Therefore, the thickness of the mat is set to the minimum necessary thickness for supporting the inner tube. Thereby, the distance between the inner tube and the case at the place where the mat exists is determined.
- the inner tube may have a communicating portion that communicates the case side and the heating element side at a location in contact with the mat. Since the communicating part communicates the case side and the heating element side at the place where it is in contact with the mat, the mat exists on both the case side and the heating element side of the communicating part. For this reason, when a lot of water is absorbed by the mat, the water moves from the case-side mat to the heating element-side mat through the communicating portion. Thereby, since it can suppress that water reaches
- the thickness of the inner tube where the mat is present it is possible to make the thickness of the inner tube where the mat is present larger than the portion where the inner tube protrudes from the mat. If the thickness of the inner tube is changed in this way, the distance between the inner tube and the case can be changed between the portion where the mat is provided and the portion where the inner tube protrudes from the mat.
- the thickness of the case where the mat is present can be made larger than the position where the inner tube protrudes from the mat. If the thickness of the case is changed in this way, the distance between the inner tube and the case can be changed between the portion where the mat is provided and the portion where the inner tube protrudes from the mat.
- the heating element can be made of a material capable of absorbing water. If it does so, the water which permeated through the communication part from the case side to the heat generating body side will be absorbed by the heat generating body. This water moves through the heating element and is removed from the heating element by the gas flowing through the heating element. Thereby, water can be quickly removed from the mat and the heating element.
- electricity can be prevented from flowing through the case of the electrically heated catalyst.
- FIG. 1 is a diagram showing a schematic configuration of an electrically heated catalyst according to Example 1.
- FIG. 3 is a diagram showing a schematic configuration of an electrically heated catalyst according to Example 2.
- FIG. 4 is a diagram showing a schematic configuration of an electrically heated catalyst according to Example 3.
- FIG. 1 is a diagram showing a schematic configuration of an electrically heated catalyst 1 according to the present embodiment.
- the electrically heated catalyst 1 according to this embodiment is provided in the exhaust pipe 2 of the internal combustion engine mounted on the vehicle.
- the internal combustion engine may be a diesel engine or a gasoline engine. It can also be used in a vehicle that employs a hybrid system equipped with an electric motor.
- FIG. 1 is a cross-sectional view of the electrically heated catalyst 1 cut in the longitudinal direction along the central axis A of the exhaust pipe 2.
- the electrically heated catalyst 1 shown in FIG. Since the shape of the electrically heated catalyst 1 is symmetrical with respect to the central axis A, only the upper part is shown in FIG.
- the electrically heated catalyst 1 includes a cylindrical catalyst carrier 3 centering on a central axis A.
- a catalyst carrier 3, an inner tube 4, and a case 5 are provided in this order from the central axis A side.
- a mat 6 is provided between the catalyst carrier 3 and the inner tube 4 and between the inner tube 4 and the case 5.
- the catalyst carrier 3 is made of a material that generates electrical resistance and generates heat when energized.
- SiC is used as the material of the catalyst carrier 3.
- the catalyst carrier 3 has a plurality of passages extending in the direction in which the exhaust flows (that is, in the direction of the central axis A) and having a cross section perpendicular to the direction in which the exhaust flows in a honeycomb shape. Exhaust gas flows through this passage.
- the outer shape of the catalyst carrier 3 is, for example, a cylindrical shape centered on the central axis A of the exhaust pipe 2.
- the cross-sectional shape of the catalyst carrier 3 having a cross section orthogonal to the central axis A may be, for example, an ellipse.
- the central axis A is a central axis common to the exhaust pipe 2, the catalyst carrier 3, the inner pipe 4, and the case 5.
- the catalyst carrier 3 corresponds to the heating element in the present invention. Even when the heating element is provided on the upstream side of the catalyst, the present embodiment can be similarly applied.
- the catalyst is supported on the catalyst carrier 3.
- the catalyst include an oxidation catalyst, a three-way catalyst, an NOx storage reduction catalyst, and a selective reduction NOx catalyst.
- Two electrodes 7 are connected to the catalyst carrier 3, and the catalyst carrier 3 is energized by applying a voltage between the electrodes 7.
- the catalyst carrier 3 generates heat due to the electrical resistance of the catalyst carrier 3.
- an electrical insulating material is used, for example, a ceramic fiber mainly composed of alumina.
- the mat 6 is wound around the outer peripheral surface of the catalyst carrier 3 and the outer peripheral surface of the inner tube 4. Since the mat 6 covers the outer peripheral surface of the catalyst carrier 3 (a surface parallel to the central axis A), electricity is prevented from flowing to the inner tube 4 and the case 5 when the catalyst carrier 3 is energized. .
- the inner tube 4 is formed in a tubular shape around the central axis A.
- the inner tube 4 is longer in the central axis A direction than the mat 6. For this reason, the inner tube 4 protrudes from the mat 6 to the upstream side and the downstream side.
- the inner diameter of the inner tube 4 is substantially the same as the outer diameter of the mat 6 when the outer periphery of the catalyst carrier 3 is covered with the mat 6.
- the thickness of the inner tube 4 differs between the central portion 41 that is in contact with the mat 6 and the end portion 42 that is a portion protruding upstream and downstream of the mat 6. This thickness is set so that the distance between the end portion 42 and the case 5 is longer than the distance between the central portion 41 and the case 5.
- the material of the case 5 is a metal, and for example, a stainless steel material can be used.
- the case 5 includes an accommodating portion 51 that includes a curved surface parallel to the central axis A, and a tapered portion 52 that connects the accommodating portion 51 and the exhaust pipe 2 on the upstream side and the downstream side of the accommodating portion 51. 53.
- the catalyst carrier 3, the inner tube 4, and the mat 6 are accommodated inside the accommodating portion 51.
- the tapered portions 52 and 53 have a tapered shape in which the passage cross-sectional area decreases as the distance from the accommodating portion 51 increases. That is, the taper portion 52 upstream of the catalyst carrier 3 has a smaller sectional area toward the upstream side, and the taper portion 53 downstream of the catalyst carrier 3 has a smaller sectional area toward the downstream side.
- the inner diameter of the accommodating portion 51 is substantially the same as the outer diameter of the mat 6 when the outer periphery of the inner tube 4 is covered with the mat 6.
- Two electrodes 7 are connected to the catalyst carrier 3.
- holes 43 and 54 are formed in the inner tube 4 and the case 5.
- the mat 6 is not provided around the electrode 7 until the electrode 7 is connected to the catalyst carrier 3.
- An insulating material 8 that supports the electrode 7 is provided in the hole 54 formed in the case 5.
- the insulating material 8 is provided between the case 5 and the electrode 7 without a gap. In this manner, a closed space 9 is formed in the case 5 around the electrode 7.
- water condensed on the upstream side of the catalyst carrier 3 may flow on the inner wall of the exhaust pipe 2 or the case 5 and adhere to the mat 6.
- the water adheres to the mat 6 between the inner tube 4 and the accommodating portion 51. That is, since the inner tube 4 protrudes upstream and downstream of the mat 6, water is prevented from entering the inner tube 4. Thereby, it is suppressed that the case 5 and the catalyst carrier 3 are short-circuited by water at the upstream end and the downstream end of the mat 6.
- the case 5 and the catalyst carrier 3 may be short-circuited by the PM.
- the inner tube 4 protrudes from the mat 6 and the temperature of the protruding portion is increased due to the heat of the exhaust, the PM adhering to the inner tube 4 can be oxidized and removed. Thereby, it is suppressed that case 5 and the catalyst support
- the water adhering to the mat 6 evaporates due to the heat of the exhaust and the heat of the catalyst carrier 3.
- the amount of adhering water increases, a part of the water does not immediately evaporate and stays in the mat 6. Then, water may reach the space 9 around the electrode 7 through the mat 6 and stay in the space 9 in some cases. In this way, the water present in the space 9 is difficult to remove even if it evaporates. If water vapor is present in the space 9, the insulation resistance between the electrode 7 and the case 5 is greatly reduced. If it does so, when there exists a request
- the distance between the end 42 and the case 5 is shortened at the end 42 of the inner tube 4, there is a possibility that electric discharge occurs. For this reason, when the end portion 42 is brought close to the case 5 in accordance with the central portion 41, a discharge can occur. Therefore, the distance between the end portion 42 and the case 5 is a distance that can avoid discharge. As a result, the distance between the end portion 42 and the case 5 is longer than the distance between the central portion 41 and the case 5.
- the required distance to the case 5 differs between the central portion 41 and the end portion 42 of the inner tube 4.
- the outer peripheral surface of the inner tube 4 is formed so that the center portion 41 and the end portion 42 of the inner tube 4 have a distance corresponding to each request.
- the distance from the central axis A to the inner peripheral surface of the inner tube 4 is the same at the central portion 41 and the end portion 42. That is, the thickness of the central portion 41 is increased in order to bring the central portion 41 closer to the case 5 than the end portion 42. For this reason, there is a step between the central portion 41 and the end portion 42.
- the mat 6 between the inner tube 4 and the case 5 can be thinned, the water absorption force of the mat 6 can be limited. Thereby, the time for removing water from the mat 6 can be shortened. Therefore, it is possible to suppress electricity from flowing to the case 5.
- the thickness of the central portion 41 is increased, but another member having no water absorption may be attached to the outer peripheral surface of the inner tube 4 instead.
- FIG. 2 is a diagram showing a schematic configuration of the electrically heated catalyst 10 according to the present embodiment. Differences from the electrically heated catalyst 1 shown in Example 1 will be described. In addition, the same code
- FIG. 2 is a diagram showing a schematic configuration of the electrically heated catalyst 10 according to the present embodiment. Differences from the electrically heated catalyst 1 shown in Example 1 will be described. In addition, the same code
- the inner tube 4 is provided with a plurality of communication holes 44 that allow communication between the case 5 side and the catalyst carrier 3 side.
- the communication hole 44 is provided at a place where the mat 6 and the inner tube 4 are in contact with each other.
- the diameter of the communication hole 44 is set to a size through which water absorbed by the mat 6 can pass.
- the communication hole 44 corresponds to the communication portion in the present invention.
- the communication hole 44 allows water to pass through, the water that has entered the mat 6 outside the inner tube 4 passes through the communication hole 44 and enters the mat 6 inside the inner tube 4.
- the temperature of the catalyst carrier 3 is increased by the heat of the exhaust, the water approaching the catalyst carrier 3 is easily evaporated.
- SiC has a large water absorption capacity, when water reaches the catalyst carrier 3, the water is absorbed by the catalyst carrier 3. This water is discharged from the catalyst carrier 3 together with the exhaust gas flowing through the catalyst carrier 3. In this way, water can be prevented from staying in the mat 6.
- it can suppress that water permeates into the space 9 around the electrode 7, it can suppress that the insulation resistance of the electrode 7 and the case 5 falls significantly.
- the position of the communication hole 44 it is possible to adjust the time when water enters the inside of the inner pipe 4 through the communication hole 44. For example, if the position of the communication hole 44 is brought close to the electrode 7, it takes time for the water that has entered the mat 6 to pass through the communication hole 44, so that a short circuit due to the water that has entered the mat 6 can be suppressed. In addition, if a small amount of water has entered the mat 6, it evaporates before passing through the communication hole 44. That is, water can be passed through the communication hole 44 only when there is a risk of water entering the space 9. Further, if the position of the communication hole 44 is too close to the electrode 7, water may enter the space 9. The optimum position and size of the communication hole 44 can be obtained by experiments or the like.
- FIG. 3 is a diagram showing a schematic configuration of the electrically heated catalyst 11 according to the present embodiment. Differences from the electrically heated catalyst 1 shown in Example 1 will be described. In addition, the same code
- FIG. 3 is a diagram showing a schematic configuration of the electrically heated catalyst 11 according to the present embodiment. Differences from the electrically heated catalyst 1 shown in Example 1 will be described. In addition, the same code
- the thickness of the housing portion 55 of the case 50 is different between the central portion 501 that is in contact with the mat 61 and the end portion 502 that is not in contact with the mat 61.
- the inner tube 40 has the same thickness at a portion in contact with the mat 61 and a portion protruding from the mat 61.
- the communication hole 44 is shown in FIG. 3, the communication hole 44 may not be provided as in the first embodiment.
- the mat 61 existing between the inner tube 40 and the case 50 is preferably thin.
- the distance between the inner tube 40 and the central portion 501 is set to the minimum necessary distance that can support the inner tube 40. Thereby, the distance between the inner tube 40 and the central portion 501 is relatively short.
- the distance between the inner tube 40 and the case 50 is shortened at the end portion 502 of the housing portion 55, there is a possibility that electric discharge occurs. For this reason, discharge can occur when the end portion 502 is brought close to the inner tube 40 in accordance with the central portion 501. Therefore, the distance between the inner tube 40 and the end 502 is set to a distance that can avoid discharge. Thereby, the distance between the inner tube 40 and the end portion 502 is longer than the distance between the inner tube 40 and the central portion 501.
- the required distance to the inner tube 40 differs between the central portion 501 and the end portion 502 of the accommodating portion 55.
- the inner peripheral surface of the accommodating part 55 is formed in the center part 501 and the edge part 502 of the accommodating part 55 so that it may become the distance according to each request
- the distance from the central axis A to the outer peripheral surface of the case 50 is the same at the central portion 501 and the end portion 502. That is, in order to bring the central portion 501 closer to the inner tube 40, the thickness of the central portion 501 is increased. For this reason, there is a step between the central portion 501 and the end portion 502.
- the central portion 501 and the end portion 502 have the same thickness around the hole 54.
- the range in which the thickness of the central portion 501 is the same as the thickness of the end portion 502 can be obtained in advance by experiments or the like as a range in which discharge between the electrode 7 and the central portion 501 can be avoided.
- the mat 61 between the inner tube 40 and the case 50 can be thinned, the water absorption force of the mat 61 can be limited. Thereby, the time for removing water from the mat 61 can be shortened.
- the thickness of the central portion 501 is increased, but another member having no water absorption may be attached to the inner peripheral surface of the case 50 instead.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
Abstract
Description
通電により発熱する発熱体と、
前記発熱体を収容するケースと、
前記発熱体と前記ケースとの間に設けられ電気を絶縁するマットと、
前記ケースよりも内側で且つ前記発熱体よりも外側に設けられ、前記マットを前記ケース側と前記発熱体側とに分割しつつ前記マットにより支持される内管と、
を備え、
前記内管は、前記マットから突出し、
前記内管と前記ケースとの間の距離を、前記マットが存在する箇所においては前記内管を支持するために必要な距離とし、前記内管が前記マットから突出する箇所においては前記内管と前記ケースとの間で放電が起こることを回避するために必要な距離とする。
2 排気管
3 触媒担体
4 内管
5 ケース
6 マット
7 電極
8 絶縁材
9 空間
10 電気加熱式触媒
11 電気加熱式触媒
41 中央部
42 端部
43 孔
51 収容部
52 テーパ部
53 テーパ部
54 孔
Claims (5)
- 通電により発熱する発熱体と、
前記発熱体を収容するケースと、
前記発熱体と前記ケースとの間に設けられ電気を絶縁するマットと、
前記ケースよりも内側で且つ前記発熱体よりも外側に設けられ、前記マットを前記ケース側と前記発熱体側とに分割しつつ前記マットにより支持される内管と、
を備え、
前記内管は、前記マットから突出し、
前記内管と前記ケースとの間の距離を、前記マットが存在する箇所においては前記内管を支持するために必要な距離とし、前記内管が前記マットから突出する箇所においては前記内管と前記ケースとの間で放電が起こることを回避するために必要な距離とする電気加熱式触媒。 - 前記内管は、前記マットと接する箇所において前記ケース側と前記発熱体側とを連通する連通部を有する請求項1に記載の電気加熱式触媒。
- 前記内管が前記マットから突出する箇所よりも、前記マットが存在する箇所の前記内管の厚さを大きくする請求項1または2に記載の電気加熱式触媒。
- 前記内管が前記マットから突出する箇所よりも、前記マットが存在する箇所の前記ケースの厚さを大きくする請求項1から3の何れか1項に記載の電気加熱式触媒。
- 前記発熱体は、吸水可能な材料からなる請求項1から4の何れか1項に記載の電気加熱式触媒。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/062914 WO2012014317A1 (ja) | 2010-07-30 | 2010-07-30 | 電気加熱式触媒 |
US13/395,989 US20120171082A1 (en) | 2010-07-30 | 2010-07-30 | Electric heating catalyst |
CN2010800407056A CN103025408A (zh) | 2010-07-30 | 2010-07-30 | 电加热式催化装置 |
EP10855326.4A EP2599538A4 (en) | 2010-07-30 | 2010-07-30 | CATALYST ELECTRICALLY HEATED |
JP2012526260A JP5472468B2 (ja) | 2010-07-30 | 2010-07-30 | 電気加熱式触媒 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2010/062914 WO2012014317A1 (ja) | 2010-07-30 | 2010-07-30 | 電気加熱式触媒 |
Publications (1)
Publication Number | Publication Date |
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WO2012014317A1 true WO2012014317A1 (ja) | 2012-02-02 |
Family
ID=45529560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2010/062914 WO2012014317A1 (ja) | 2010-07-30 | 2010-07-30 | 電気加熱式触媒 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20120171082A1 (ja) |
EP (1) | EP2599538A4 (ja) |
JP (1) | JP5472468B2 (ja) |
CN (1) | CN103025408A (ja) |
WO (1) | WO2012014317A1 (ja) |
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JPH05146686A (ja) * | 1991-04-05 | 1993-06-15 | W R Grace & Co | 電気的に加熱しうる触媒コンバーター・コアに対するコア員 |
JPH05269387A (ja) | 1992-03-26 | 1993-10-19 | Nissan Motor Co Ltd | 排気浄化用触媒コンバータ装置 |
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EP0456919A3 (en) * | 1990-04-16 | 1992-01-22 | W.R. Grace & Co.-Conn. | Catalytic converter system |
US5070694A (en) * | 1990-10-31 | 1991-12-10 | W. R. Grace & Co. -Conn. | Structure for electrically heatable catalytic core |
JPH062533A (ja) * | 1992-06-19 | 1994-01-11 | Mazda Motor Corp | 排気ガス浄化装置 |
JP2002153930A (ja) * | 2000-09-06 | 2002-05-28 | Toyota Motor Corp | 中空部材、その製造方法、その中空部材を用いた流体流通システム、および中空状材の成形装置 |
US7341699B2 (en) * | 2002-09-03 | 2008-03-11 | Arvin Technologies, Inc. | Emission abatement device and method of using same |
GB0507326D0 (en) * | 2005-04-12 | 2005-05-18 | Delphi Tech Inc | Catalytic converter apparatus and method |
KR101200893B1 (ko) * | 2010-03-29 | 2012-11-13 | 도요타 지도샤(주) | 촉매 컨버터 장치 |
JP5120500B2 (ja) * | 2010-07-15 | 2013-01-16 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
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2010
- 2010-07-30 CN CN2010800407056A patent/CN103025408A/zh active Pending
- 2010-07-30 WO PCT/JP2010/062914 patent/WO2012014317A1/ja active Application Filing
- 2010-07-30 EP EP10855326.4A patent/EP2599538A4/en not_active Withdrawn
- 2010-07-30 US US13/395,989 patent/US20120171082A1/en not_active Abandoned
- 2010-07-30 JP JP2012526260A patent/JP5472468B2/ja not_active Expired - Fee Related
Patent Citations (5)
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JPH05146686A (ja) * | 1991-04-05 | 1993-06-15 | W R Grace & Co | 電気的に加熱しうる触媒コンバーター・コアに対するコア員 |
JPH05269387A (ja) | 1992-03-26 | 1993-10-19 | Nissan Motor Co Ltd | 排気浄化用触媒コンバータ装置 |
JPH05277379A (ja) * | 1992-04-01 | 1993-10-26 | Nissan Motor Co Ltd | 排気浄化用触媒コンバータ装置 |
JPH0596423U (ja) * | 1992-05-26 | 1993-12-27 | カルソニック株式会社 | メタル触媒コンバータ |
JPH08266909A (ja) * | 1995-03-29 | 1996-10-15 | Showa Aircraft Ind Co Ltd | 電気加熱式触媒装置用メタル担体およびその製造方法 |
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See also references of EP2599538A4 |
Also Published As
Publication number | Publication date |
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CN103025408A (zh) | 2013-04-03 |
EP2599538A1 (en) | 2013-06-05 |
JP5472468B2 (ja) | 2014-04-16 |
EP2599538A4 (en) | 2014-01-15 |
US20120171082A1 (en) | 2012-07-05 |
JPWO2012014317A1 (ja) | 2013-09-09 |
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