EP2947288A1 - Electric heating device and exhaust purification system for an internal combustion engine - Google Patents
Electric heating device and exhaust purification system for an internal combustion engine Download PDFInfo
- Publication number
- EP2947288A1 EP2947288A1 EP15169010.4A EP15169010A EP2947288A1 EP 2947288 A1 EP2947288 A1 EP 2947288A1 EP 15169010 A EP15169010 A EP 15169010A EP 2947288 A1 EP2947288 A1 EP 2947288A1
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- EP
- European Patent Office
- Prior art keywords
- heat generating
- generating member
- casing
- support member
- electric heating
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Classifications
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- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
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- 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
Definitions
- the present invention relates to an electric heating device and an exhaust purification system for an internal combustion engine.
- an exhaust purification system wherein an exhaust purification device such as a particulate filter which traps particulate matter in exhaust gas is arranged inside of an engine exhaust passage, wherein an electric heating device is arranged upstream of the exhaust purification device inside of the exhaust passage, and wherein the exhaust gas from the internal combustion engine is heated by the electric heating device and the heated exhaust gas is used to heat the exhaust purification device.
- an exhaust purification device such as a particulate filter which traps particulate matter in exhaust gas is arranged inside of an engine exhaust passage
- an electric heating device is arranged upstream of the exhaust purification device inside of the exhaust passage, and wherein the exhaust gas from the internal combustion engine is heated by the electric heating device and the heated exhaust gas is used to heat the exhaust purification device.
- an electric heating device wherein a honeycomb-shaped support member is fastened inside a casing through in which exhaust gas flows, wherein a honeycomb-shaped electric type heat generating member is arranged upstream in the flow of exhaust gas of the support member, and wherein the heat generating member is supported by the support member through a supporter (see PTL 1).
- an electric heating device wherein a support member is fastened inside a casing, wherein a first electric type heat generating member is arranged at one side of the support member in a longitudinal axial direction of the casing and a second electric type heat generating member is arranged at the other side of the support member, wherein each heat generating member is provided with an outer tube and a strip-shaped heat generating element, wherein each outer tube is arranged in the casing so that its center axial line is parallel to a longitudinal axial line of the casing, wherein each heat generating element has two end parts which are fastened to an inner circumferential surface of the corresponding outer tube and an intermediate part which extends between the two end parts without being fastened to the corresponding outer tube, wherein each intermediate part is wound about a winding axial line which is parallel to the center axial line of the corresponding outer tube, wherein a supporter is provided which run from the first heat generating member through the support member to the second heat generating member, wherein
- the first heat generating member and the second heat generating member are supported by the support member in the state where a winding direction of the intermediate part of the first heat generating member and a winding direction of the intermediate part of the second heat generating member are opposite to each other.
- the first heat generating member and the second heat generating member have weak heat generating regions, respectively, and the first heat generating member and the second heat generating member are supported by the support member so that the weak heat generating region of the first heat generating member and the weak heat generating region of the second heat generating member substantially do not overlap when viewed along the longitudinal axial line of the casing.
- the electric heating device is further provided with a fastener which fastens at least part of the supporter to an inside wall surface of the casing.
- an exhaust purification system for an internal combustion engine wherein an exhaust purification device is arranged in an engine exhaust passage, and wherein an electric heating device according to any one of claims 1 to 4 is arranged upstream of the exhaust purification device inside the exhaust passage, whereby the exhaust gas from the internal combustion engine is heated by the electric heating device and the heated exhaust gas is used to heat the exhaust purification device.
- an electric heating device A is provided with a cylindrical casing 10. Inside the casing 10, a columnar support member 20 is fastened. In the embodiment which is shown in FIG. 1 , a ring-shaped small diameter part 11 is formed at the casing 10. This small diameter part 11 presses against the support member 20 whereby the support member 20 is fastened to the casing 10.
- the support member 20 forms a honeycomb structure which is formed from, for example, a ceramic or metal. Therefore, the fluid which flows through the inside of the casing 10 can run through the support member 20 along a longitudinal axial line LC direction of the casing 10.
- a first electric type heat generating member 30a is arranged, while at the other side of the support member 20 in the longitudinal axial line LC direction of the casing 10 or the downstream side in the flow of fluid, a second electric type heat generating member 30b is arranged.
- These heat generating members 30a, 30b are supported by the support member 20 through supporters 40.
- the first heat generating member 30a and the second heat generating member 30b are separated from the casing 10, that is, are supported by the support member 20 without being supported by the casing 10. Further, between the first heat generating member 30a and the support member 20 and between the second heat generating member 30b and the support member 20, slight clearances are provided.
- the first heat generating member 30a is provided with a cylindrical outer tube 31. Inside the outer tube 31, a strip-shaped heat generating element 32 is held in a state wound about a winding axial line LW.
- the winding axial line LW matches a center axial line LHC of the outer tube 31.
- the winding axial line LW does not match the center axial line LHC of the outer tube 31, however, extends in parallel with the center axial line LHC of the outer tube 31.
- a heat generating element 32 forms a honeycomb structure which is formed by alternately stacking flat plates 33 and corrugated plates 34. Between the flat plates 33 and the corrugated plates 34, flow paths 35 through which the fluid can flow are formed.
- the outer tube 31, flat plates 33, and corrugated plates 34 are formed from electroconductive materials, for example, metal plates.
- FIG. 4 shows the state where the heat generating element 32 which is shown in FIG. 2 is unwound and rendered flat.
- the heat generating element 32 has two end parts 32e, 32e in the length direction LH and an intermediate part 32i which extends between the two end parts 32e, 32e.
- the heat generating element 32 is fastened and electrically connected to the outer tube 31 at the two end parts 32e, 32e. In this case, the intermediate part 32i is not fastened to the outer tube 31.
- the heat generating element 32 as shown in FIG. 2 and FIG. 3 , is wound so that a clearance 36 is formed between one part of the intermediate part 32i and another part of the intermediate part 32i.
- This clearance 36 acts as an electrical insulating member.
- the first heat generating member 30a further has an electrode 37 which is electrically connected to the heat generating element 32.
- the electrode 37 is electrically insulated from the outer tube 31 while passing through the outer tube 31 and being electrically connected to the intermediate part 32i of the heat generating element 32.
- the electrode 37 passes through the casing 10 and extends to the outside of the casing 10. Note that the outer tube 31 is grounded.
- the first heat generating member 30a and the second heat generating member 30b are arranged inside the casing 10 so that the center axial lines LHC of the outer tubes 31 of the first heat generating member 30a and the second heat generating member 30b match with each other.
- the center axial lines LHC of the outer tubes 31 of the first heat generating member 30a and the second heat generating member 30b do not match with each other but extend in parallel with each other. Further, in the embodiment which is shown in FIG.
- the first heat generating member 30a and the second heat generating member 30b are arranged in the casing 10 so that the center axial lines LHC of the outer tubes 31 of the first heat generating member 30a and the second heat generating member 30b match with the longitudinal axial line LC of the casing 10.
- the flow paths 35 of the above-mentioned heat generating elements 32 extend in parallel with the longitudinal axial line LC of the casing 10.
- the center axial lines LHC of the outer tubes 31 of the first heat generating member 30a and the second heat generating member 30b do not match with the longitudinal axial line LC of the casing 10, however, are parallel with the longitudinal axial line LC of the casing 10.
- the above-mentioned supporters 40 run from the first heat generating member 30a through the support member 20 to the second heat generating member 30b.
- one ends of the supporters 40 are fastened to the first heat generating member 30a
- the other ends of the supporters 40 are fastened to the second heat generating member 30b
- intermediate parts of the supporters 40 are fastened to the support member 20.
- the supporters 40 are fastened to the intermediate parts 32i of the heat generating elements 32.
- the heat generating element 32 of the first heat generating member 30a and the heat generating element 32 of the second heat generating member 30b are held inside the outer tubes 31 in a state wound around the corresponding winding axial lines LW.
- a force acts on the heat generating elements 32 in an unwinding direction.
- the above-mentioned supporters 40 have the action of maintaining the positions of the heat generating elements 32 against such an unwinding force. As a result, the clearances 36 are reliably maintained and occurrence of short-circuits is obstructed.
- FIG. 5 shows a layout of the first heat generating member 30a and the second heat generating member 30b in the electric heating device A which is shown in FIG. 1 .
- the winding direction of the heat generating element 32 of the first heat generating member 30a and the winding direction of the heat generating element 32 of the second heat generating member 30b are opposite to each other.
- the direction of the force unwinding the heat generating element 32 of the first heat generating member 30a and the direction of the force unwinding the heat generating element 32 of the second heat generating member 30b are opposite to each other.
- the electrodes 37 are electrically connected to a power source (not shown).
- a power source not shown
- current flows through the heat generating elements 32 whereby the heat generating elements 32 generate heat and thereby the fluid which runs through the heat generating elements 32 is heated.
- the fluid is heated by both the first heat generating member 30a and the second heat generating member 30b, so the fluid can be quickly heated. That is, the heating action of the electric heating device A is enhanced.
- the two heat generating members 30a, 30b are supported by a single support member 20, so the electric heating device A can be made smaller in size.
- the heat generating members 30a, 30b are fastened to the two ends of the support member 20, so the heat generating members 30a, 30b are stably supported.
- the incomplete regions 38, 38 the flat plates 33 and corrugated plates 34 are offset from each other in the length direction LH.
- the above-mentioned electrode 37 is electrically connected to one end 39a in the length direction LH of one side surface of the complete region 39.
- current flows from the electrode 37 through the complete region 39, and then reaches the outer tube 31 through the other end 39b in the length direction LH of the other side surface of the complete region 39.
- the incomplete regions 38, 38 will be called the "weak heat generating regions”.
- the fluid which passes through the weak heat generating regions 38, 38 is not heated much at all.
- the first heat generating member 30a and the second heat generating member 30b are supported by the support member 20 so that the weak heat generating regions 38 of the first heat generating member 30a and the weak heat generating regions 38 of the second heat generating member 30b substantially do not overlap when viewed along the longitudinal axial line LC of the casing 10.
- the angular positions of the first heat generating member 30a and the second heat generating member 30b about the longitudinal axial line LC of the casing 10 are set so that the weak heat generating regions 38 of the first heat generating member 30a and the weak heat generating regions 38 of the second heat generating member 30b substantially do not overlap.
- the fluid which passed through the weak heat generating regions 38 of the first heat generating member 30a and was not heated much at all is blocked from passing through the weak heat generating regions 38 of the second heat generating member 30b, that is, passes through a region which generates heat well. Therefore, a deviation in temperature of the fluid in the radial direction or circumferential direction of the casing 10 is reduced.
- FIG. 6 shows another embodiment of the layout of the first heat generating member 30a and the second heat generating member 30b.
- the winding direction of the heat generating element 32 of the first heat generating member 30a and the winding direction of the heat generating element 32 of the second heat generating member 30b is the same directions as each other.
- the angular positions of the first heat generating member 30a and the second heat generating member 30b about the longitudinal axial line LC of the casing 10 are set so that the weak heat generating regions 38 of the first heat generating member 30a and the weak heat generating regions 38 of the second heat generating member 30b substantially do not overlap each other when viewed along the longitudinal axial line LC of the casing 10. As a result, the variation in temperature of the fluid in the radial direction or circumferential direction of the casing 10 is reduced.
- FIG. 7 shows another embodiment according to the present invention.
- the thickness of the support member 20 is made smaller. That is, the plurality of heat generating members 30a, 30b are stably held through the supporters 40, so the support member 20 can be made smaller in size. Therefore, the electric heating device A is made further smaller in size.
- FIG. 8 shows still another embodiment according to the present invention.
- fasteners 41 are provided which fasten at least part of the supporters 40 to an inside wall surface of the casing 10. That is, the supporters 40 which adjoin the casing 10 extend running through the first heat generating member 30a and the second heat generating member 30b. At the two ends of these supporters 40, the fasteners 41 which extend outward in the radial direction are connected. As a result, the supporters 40 are fastened through the fasteners 41 to the inside wall surface of the casing 10. As a result, the first heat generating member 30a and the second heat generating member 30b are more stably supported.
- the fasteners 41 are connected to only one of the upstream side end parts and the downstream side end part of the supporters 40. In a still other embodiment which is not shown, all of the supporters 40 are fastened by fasteners 41 to the inside wall surface of the casing 10.
- FIG. 9 shows still another embodiment according to the present invention.
- a first support member 20a and a second support member 20b are arranged separated from each other in the long direction LC and are fastened to the casing 10 at a first small diameter part 11a and a second small diameter part 11b, respectively.
- a first heat generating member 30a is arranged, between the first support member 20a and the second support member 20b, a second heat generating member 30b is arranged, while downstream of the second support member 20b, a third heat generating member 30c is arranged.
- These heat generating members 30a, 30b, and 30c are supported by the support members 20a, 20b via supporters 40 which run from the first heat generating member 30a through the first support member 20a and the second support member 20b and reach the third heat generating member 30c.
- FIG. 10 shows the case of application of the above-mentioned electric heating device A to an exhaust purification system for an internal combustion engine.
- an internal combustion engine body B is connected through an exhaust pipe C1 to the electric heating device A, while the electric heating device A is connected through an exhaust pipe C2 to the exhaust purification device D.
- the exhaust purification device D is formed from a particulate filter which traps particulate matter which is contained in the exhaust gas or an exhaust purification catalyst which oxidizes or reduces ingredients in the exhaust gas.
- the electric heating device A is operated.
- the exhaust gas is heated by the electric heating device A, and the heated exhaust gas is used to heat the exhaust purification device D.
- the casing 10 of the electric heating device A is formed from an exhaust pipe of an internal combustion engine.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
- The present invention relates to an electric heating device and an exhaust purification system for an internal combustion engine.
- Known in the art is an exhaust purification system, wherein an exhaust purification device such as a particulate filter which traps particulate matter in exhaust gas is arranged inside of an engine exhaust passage, wherein an electric heating device is arranged upstream of the exhaust purification device inside of the exhaust passage, and wherein the exhaust gas from the internal combustion engine is heated by the electric heating device and the heated exhaust gas is used to heat the exhaust purification device.
- Further, known in the art is an electric heating device, wherein a honeycomb-shaped support member is fastened inside a casing through in which exhaust gas flows, wherein a honeycomb-shaped electric type heat generating member is arranged upstream in the flow of exhaust gas of the support member, and wherein the heat generating member is supported by the support member through a supporter (see PTL 1).
- PTL 1: Japanese Patent Publication No.
11-500205A - It has been desired to shorten a time required for raising a temperature of the exhaust purification device to a target temperature. This shortening of time is achieved by strengthening a heating action of the electric heating device. Strengthening this heating action is, for example, achieved by increasing the number of heat generating members.
- However, in the electric heating device of PTL 1, it is necessary to increase not only the number of heat generating members, but also increase the number of support members which support the heat generating members. As a result, a large space is required for arranging the electric heating device. If considering there is a limit to the space in which the electric heating device can be arranged, it may be said that there is also a limit to strengthening the heating action.
- According to one aspect of the present invention, there is provided an electric heating device, wherein a support member is fastened inside a casing, wherein a first electric type heat generating member is arranged at one side of the support member in a longitudinal axial direction of the casing and a second electric type heat generating member is arranged at the other side of the support member, wherein each heat generating member is provided with an outer tube and a strip-shaped heat generating element, wherein each outer tube is arranged in the casing so that its center axial line is parallel to a longitudinal axial line of the casing, wherein each heat generating element has two end parts which are fastened to an inner circumferential surface of the corresponding outer tube and an intermediate part which extends between the two end parts without being fastened to the corresponding outer tube, wherein each intermediate part is wound about a winding axial line which is parallel to the center axial line of the corresponding outer tube, wherein a supporter is provided which run from the first heat generating member through the support member to the second heat generating member, wherein the supporter is fastened to the intermediate part of the first heat generating member and the intermediate part of the second heat generating member to support the first heat generating member and the second heat generating member with the support member via the supporter, and wherein the support member and the first heat generating member and second heat generating member are designed so that fluid can flow therethrough in the longitudinal axis direction of the casing, whereby the fluid which flows through the inside of the casing is heated by the first heat generating member and the second heat generating member.
- Preferably, the first heat generating member and the second heat generating member are supported by the support member in the state where a winding direction of the intermediate part of the first heat generating member and a winding direction of the intermediate part of the second heat generating member are opposite to each other.
- Preferably, the first heat generating member and the second heat generating member have weak heat generating regions, respectively, and the first heat generating member and the second heat generating member are supported by the support member so that the weak heat generating region of the first heat generating member and the weak heat generating region of the second heat generating member substantially do not overlap when viewed along the longitudinal axial line of the casing.
- Preferably, the electric heating device is further provided with a fastener which fastens at least part of the supporter to an inside wall surface of the casing.
- According to another aspect of the present invention, there is provided an exhaust purification system for an internal combustion engine, wherein an exhaust purification device is arranged in an engine exhaust passage, and wherein an electric heating device according to any one of claims 1 to 4 is arranged upstream of the exhaust purification device inside the exhaust passage, whereby the exhaust gas from the internal combustion engine is heated by the electric heating device and the heated exhaust gas is used to heat the exhaust purification device.
- It is possible to strengthen the heating action while reducing the size of the electric heating device.
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FIG. 1 is a cross-sectional view of an electric heating device. -
FIG. 2 is a front view of a heat generating member. -
FIG. 3 is a partial enlarged view of a heat generating member. -
FIG. 4 is a view which shows an unwound heat generating element. -
FIG. 5 is a view which shows the layout of the first heat generating member and the second heat generating member. -
FIG. 6 is a view which shows another embodiment of the layout of the first heat generating member and the second heat generating member. -
FIG. 7 is a cross-sectional view of an electric heating device which shows another embodiment according to the present invention. -
FIG. 8 is a cross-sectional view of an electric heating device which shows still another embodiment according to the present invention. -
FIG. 9 is a cross-sectional view of an electric heating device which shows still another embodiment according to the present invention. -
FIG. 10 is an overview of an internal combustion engine. - Referring to
FIG. 1 , an electric heating device A is provided with acylindrical casing 10. Inside thecasing 10, acolumnar support member 20 is fastened. In the embodiment which is shown inFIG. 1 , a ring-shapedsmall diameter part 11 is formed at thecasing 10. Thissmall diameter part 11 presses against thesupport member 20 whereby thesupport member 20 is fastened to thecasing 10. Thesupport member 20 forms a honeycomb structure which is formed from, for example, a ceramic or metal. Therefore, the fluid which flows through the inside of thecasing 10 can run through thesupport member 20 along a longitudinal axial line LC direction of thecasing 10. - At one side of the
support member 20 in the longitudinal axial line LC direction of thecasing 10 or the upstream side in the flow of fluid, a first electric typeheat generating member 30a is arranged, while at the other side of thesupport member 20 in the longitudinal axial line LC direction of thecasing 10 or the downstream side in the flow of fluid, a second electric typeheat generating member 30b is arranged. Theseheat generating members support member 20 throughsupporters 40. In this case, the firstheat generating member 30a and the secondheat generating member 30b are separated from thecasing 10, that is, are supported by thesupport member 20 without being supported by thecasing 10. Further, between the firstheat generating member 30a and thesupport member 20 and between the secondheat generating member 30b and thesupport member 20, slight clearances are provided. - Next, referring to
FIG. 2 to FIG. 4 , the firstheat generating member 30a will be explained. The secondheat generating member 30b is similar to the firstheat generating member 30a, so the explanation will be omitted. Referring toFIG. 2 , the firstheat generating member 30a is provided with a cylindricalouter tube 31. Inside theouter tube 31, a strip-shapedheat generating element 32 is held in a state wound about a winding axial line LW. In the embodiment which is shown inFIG. 2 , the winding axial line LW matches a center axial line LHC of theouter tube 31. In another embodiment which is not shown, the winding axial line LW does not match the center axial line LHC of theouter tube 31, however, extends in parallel with the center axial line LHC of theouter tube 31. - A
heat generating element 32, as shown inFIG. 3 , forms a honeycomb structure which is formed by alternately stackingflat plates 33 andcorrugated plates 34. Between theflat plates 33 and thecorrugated plates 34,flow paths 35 through which the fluid can flow are formed. Theouter tube 31,flat plates 33, andcorrugated plates 34 are formed from electroconductive materials, for example, metal plates. -
FIG. 4 shows the state where theheat generating element 32 which is shown inFIG. 2 is unwound and rendered flat. Referring toFIG. 4 , theheat generating element 32 has twoend parts intermediate part 32i which extends between the twoend parts FIG. 2 , theheat generating element 32 is fastened and electrically connected to theouter tube 31 at the twoend parts intermediate part 32i is not fastened to theouter tube 31. - Further, the
heat generating element 32, as shown inFIG. 2 andFIG. 3 , is wound so that aclearance 36 is formed between one part of theintermediate part 32i and another part of theintermediate part 32i. Thisclearance 36 acts as an electrical insulating member. - The first
heat generating member 30a further has anelectrode 37 which is electrically connected to theheat generating element 32. As will be understood fromFIG. 2 andFIG. 4 , theelectrode 37 is electrically insulated from theouter tube 31 while passing through theouter tube 31 and being electrically connected to theintermediate part 32i of theheat generating element 32. As shown inFIG. 1 , theelectrode 37 passes through thecasing 10 and extends to the outside of thecasing 10. Note that theouter tube 31 is grounded. - In the embodiment which is shown in
FIG. 1 , the firstheat generating member 30a and the secondheat generating member 30b are arranged inside thecasing 10 so that the center axial lines LHC of theouter tubes 31 of the firstheat generating member 30a and the secondheat generating member 30b match with each other. In another embodiment which is not shown, the center axial lines LHC of theouter tubes 31 of the firstheat generating member 30a and the secondheat generating member 30b do not match with each other but extend in parallel with each other. Further, in the embodiment which is shown inFIG. 1 , the firstheat generating member 30a and the secondheat generating member 30b are arranged in thecasing 10 so that the center axial lines LHC of theouter tubes 31 of the firstheat generating member 30a and the secondheat generating member 30b match with the longitudinal axial line LC of thecasing 10. In this case, theflow paths 35 of the above-mentionedheat generating elements 32 extend in parallel with the longitudinal axial line LC of thecasing 10. In another embodiment which is not shown, the center axial lines LHC of theouter tubes 31 of the firstheat generating member 30a and the secondheat generating member 30b do not match with the longitudinal axial line LC of thecasing 10, however, are parallel with the longitudinal axial line LC of thecasing 10. - Referring again to
FIG. 1 , the above-mentionedsupporters 40 run from the firstheat generating member 30a through thesupport member 20 to the secondheat generating member 30b. In the embodiment which is shown inFIG. 1 , one ends of thesupporters 40 are fastened to the firstheat generating member 30a, the other ends of thesupporters 40 are fastened to the secondheat generating member 30b, and intermediate parts of thesupporters 40 are fastened to thesupport member 20. In this case, as shown inFIG. 2 , thesupporters 40 are fastened to theintermediate parts 32i of theheat generating elements 32. - As explained above, the
heat generating element 32 of the firstheat generating member 30a and theheat generating element 32 of the secondheat generating member 30b are held inside theouter tubes 31 in a state wound around the corresponding winding axial lines LW. In this case, due to the elasticity of theheat generating elements 32, a force acts on theheat generating elements 32 in an unwinding direction. The above-mentionedsupporters 40 have the action of maintaining the positions of theheat generating elements 32 against such an unwinding force. As a result, theclearances 36 are reliably maintained and occurrence of short-circuits is obstructed. -
FIG. 5 shows a layout of the firstheat generating member 30a and the secondheat generating member 30b in the electric heating device A which is shown inFIG. 1 . In the embodiment which is shown inFIG. 5 , the winding direction of theheat generating element 32 of the firstheat generating member 30a and the winding direction of theheat generating element 32 of the secondheat generating member 30b are opposite to each other. In this case, the direction of the force unwinding theheat generating element 32 of the firstheat generating member 30a and the direction of the force unwinding theheat generating element 32 of the secondheat generating member 30b are opposite to each other. As a result, the force unwinding theheat generating element 32 of the firstheat generating member 30a and the force unwinding theheat generating element 32 of the secondheat generating member 30b are cancelled out through thesupporters 40. Therefore, the positions of theheat generating elements 32 can be reliably maintained. - When the first
heat generating member 30a and the secondheat generating member 30b should be operated, theelectrodes 37 are electrically connected to a power source (not shown). As a result, current flows through theheat generating elements 32 whereby theheat generating elements 32 generate heat and thereby the fluid which runs through theheat generating elements 32 is heated. In this case, the fluid is heated by both the firstheat generating member 30a and the secondheat generating member 30b, so the fluid can be quickly heated. That is, the heating action of the electric heating device A is enhanced. Further, the twoheat generating members single support member 20, so the electric heating device A can be made smaller in size. Furthermore, theheat generating members support member 20, so theheat generating members - In this regard, if winding a laminate of
flat plates 33 andcorrugated plates 34 to thereby form theheat generating element 32, as shown inFIG. 4 ,incomplete regions end parts complete region 39 is formed between theseincomplete regions heat generating element 32 is formed by laminating predetermined numbers offlat plates 33 andcorrugated plates 34, the numbers of theflat plates 33 andcorrugated plates 34 which form thecomplete region 39 are equal to the predetermined numbers, but the numbers of theflat plates 33 andcorrugated plates 34 which form theincomplete regions incomplete regions flat plates 33 andcorrugated plates 34 are offset from each other in the length direction LH. On top of this, the above-mentionedelectrode 37 is electrically connected to oneend 39a in the length direction LH of one side surface of thecomplete region 39. As a result, current flows from theelectrode 37 through thecomplete region 39, and then reaches theouter tube 31 through theother end 39b in the length direction LH of the other side surface of thecomplete region 39. Here, if making current flow substantially evenly inside thecomplete region 39, almost no current will flow to theincomplete regions incomplete regions incomplete regions heat generating regions - In this regard, in the embodiment which is shown in
FIG. 5 , the firstheat generating member 30a and the secondheat generating member 30b are supported by thesupport member 20 so that the weakheat generating regions 38 of the firstheat generating member 30a and the weakheat generating regions 38 of the secondheat generating member 30b substantially do not overlap when viewed along the longitudinal axial line LC of thecasing 10. In other words, the angular positions of the firstheat generating member 30a and the secondheat generating member 30b about the longitudinal axial line LC of thecasing 10 are set so that the weakheat generating regions 38 of the firstheat generating member 30a and the weakheat generating regions 38 of the secondheat generating member 30b substantially do not overlap. As a result, the fluid which passed through the weakheat generating regions 38 of the firstheat generating member 30a and was not heated much at all is blocked from passing through the weakheat generating regions 38 of the secondheat generating member 30b, that is, passes through a region which generates heat well. Therefore, a deviation in temperature of the fluid in the radial direction or circumferential direction of thecasing 10 is reduced. -
FIG. 6 shows another embodiment of the layout of the firstheat generating member 30a and the secondheat generating member 30b. In the embodiment which is shown inFIG. 6 , the winding direction of theheat generating element 32 of the firstheat generating member 30a and the winding direction of theheat generating element 32 of the secondheat generating member 30b is the same directions as each other. Further, the angular positions of the firstheat generating member 30a and the secondheat generating member 30b about the longitudinal axial line LC of thecasing 10 are set so that the weakheat generating regions 38 of the firstheat generating member 30a and the weakheat generating regions 38 of the secondheat generating member 30b substantially do not overlap each other when viewed along the longitudinal axial line LC of thecasing 10. As a result, the variation in temperature of the fluid in the radial direction or circumferential direction of thecasing 10 is reduced. -
FIG. 7 shows another embodiment according to the present invention. In the example which is shown inFIG. 7 , compared with the embodiment which is shown inFIG. 1 , the thickness of thesupport member 20 is made smaller. That is, the plurality ofheat generating members supporters 40, so thesupport member 20 can be made smaller in size. Therefore, the electric heating device A is made further smaller in size. -
FIG. 8 shows still another embodiment according to the present invention. In the embodiment which is shown inFIG. 8 ,fasteners 41 are provided which fasten at least part of thesupporters 40 to an inside wall surface of thecasing 10. That is, thesupporters 40 which adjoin thecasing 10 extend running through the firstheat generating member 30a and the secondheat generating member 30b. At the two ends of thesesupporters 40, thefasteners 41 which extend outward in the radial direction are connected. As a result, thesupporters 40 are fastened through thefasteners 41 to the inside wall surface of thecasing 10. As a result, the firstheat generating member 30a and the secondheat generating member 30b are more stably supported. In another embodiment which is not shown, thefasteners 41 are connected to only one of the upstream side end parts and the downstream side end part of thesupporters 40. In a still other embodiment which is not shown, all of thesupporters 40 are fastened byfasteners 41 to the inside wall surface of thecasing 10. -
FIG. 9 shows still another embodiment according to the present invention. In the embodiment which is shown inFIG. 9 , inside thecasing 10, afirst support member 20a and a second support member 20b are arranged separated from each other in the long direction LC and are fastened to thecasing 10 at a firstsmall diameter part 11a and a secondsmall diameter part 11b, respectively. Upstream of thefirst support member 20a, a firstheat generating member 30a is arranged, between thefirst support member 20a and the second support member 20b, a secondheat generating member 30b is arranged, while downstream of the second support member 20b, a third heat generating member 30c is arranged. Theseheat generating members support members 20a, 20b viasupporters 40 which run from the firstheat generating member 30a through thefirst support member 20a and the second support member 20b and reach the third heat generating member 30c. -
FIG. 10 shows the case of application of the above-mentioned electric heating device A to an exhaust purification system for an internal combustion engine. Referring toFIG. 10 , an internal combustion engine body B is connected through an exhaust pipe C1 to the electric heating device A, while the electric heating device A is connected through an exhaust pipe C2 to the exhaust purification device D. The exhaust purification device D is formed from a particulate filter which traps particulate matter which is contained in the exhaust gas or an exhaust purification catalyst which oxidizes or reduces ingredients in the exhaust gas. When the temperature of the exhaust purification device D should be made to rise, the electric heating device A is operated. As a result, the exhaust gas is heated by the electric heating device A, and the heated exhaust gas is used to heat the exhaust purification device D. In another embodiment which is not shown, thecasing 10 of the electric heating device A is formed from an exhaust pipe of an internal combustion engine. -
- A: electric heating device
- 10: casing
- 20: support member
- 30a: first heat generating member
- 30b: second heat generating member
- 31: outer tube
- 32: heat generating element
- 32e: two end parts
- 32i: intermediate part
- 40: supporter
Claims (5)
- An electric heating device (A), wherein a support member (20) is fastened inside a casing (10), wherein a first electric type heat generating member (30a) is arranged at one side of the support member (20) in a longitudinal axial direction (LC) of the casing (10) and a second electric type heat generating member (30b) is arranged at the other side of the support member (20), wherein each heat generating member (30a, 30b) is provided with an outer tube (31) and a strip-shaped heat generating element (32), wherein each outer tube (31) is arranged in the casing (10) so that its center axial line (LHC) is parallel to a longitudinal axial line (LC) of the casing, wherein each heat generating element (32) has two end parts (32e) which are fastened to an inner circumferential surface of the corresponding outer tube (31) and an intermediate part (32i) which extends between the two end parts (32e) without being fastened to the corresponding outer tube (31), wherein each intermediate part (32i) is wound about a winding axial line (LW) which is parallel to the center axial line (LHC) of the corresponding outer tube (31), wherein a supporter (40) is provided which runs from the first heat generating member (30a) through the support member (20) to the second heat generating member (30b), wherein the supporter (40) is fastened to the intermediate part (32i) of the first heat generating member (30a) and the intermediate part (32i) of the second heat generating member (30b) to support the first heat generating member (30a) and the second heat generating member (30b) with the support member (20) via the supporter (40), and wherein the support member (20) and the first heat generating member (30a) and second heat generating member (30b) are designed so that fluid can flow therethrough in the longitudinal axis direction (LC) of the casing (10), whereby the fluid which flows through the inside of the casing (10) is heated by the first heat generating member (30a) and the second heat generating member (30b).
- The electric heating device (A) according to claim 1 wherein said first heat generating member (30a) and said second heat generating member (30b) are supported by said support member (20) in the state where a winding direction of said intermediate part (32i) of said first heat generating member (30a) and a winding direction of said intermediate part (32i) of said second heat generating member (30b) are opposite to each other.
- The electric heating device (A) according to claim 1 or 2 wherein said first heat generating member (30a) and said second heat generating member (30b) have weak heat generating regions, respectively, and wherein said first heat generating member (30a) and said second heat generating member (30b) are supported by said support member so that the weak heat generating region of said first heat generating member (30a) and the weak heat generating region of said second heat generating member (30b) substantially do not overlap when viewed along the longitudinal axial line of said casing.
- The electric heating device (A) according to any one of claims 1 to 3 which is further provided with a fastener which fastens at least part of said supporter (40) to an inside wall surface of said casing (10).
- An exhaust purification system for an internal combustion engine, wherein an exhaust purification device (D) is arranged in an engine exhaust passage, and wherein an electric heating device (A) according to any one of claims 1 to 4 is arranged upstream of the exhaust purification device (D) inside the exhaust passage, so as to heat the exhaust gas from the internal combustion engine is heated by said electric heating device (A) and the heated exhaust gas is used to heat said exhaust purification device (D).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014107054A JP6064944B2 (en) | 2014-05-23 | 2014-05-23 | Electric heating device and exhaust purification system for internal combustion engine |
Publications (2)
Publication Number | Publication Date |
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EP2947288A1 true EP2947288A1 (en) | 2015-11-25 |
EP2947288B1 EP2947288B1 (en) | 2017-06-28 |
Family
ID=53268690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP15169010.4A Not-in-force EP2947288B1 (en) | 2014-05-23 | 2015-05-22 | Electric heating device and exhaust purification system for an internal combustion engine |
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EP (1) | EP2947288B1 (en) |
JP (1) | JP6064944B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3108678A1 (en) * | 2020-03-31 | 2021-10-01 | Faurecia Systemes D'echappement | Heater for an exhaust gas purification device |
WO2023046631A1 (en) * | 2021-09-27 | 2023-03-30 | Vitesco Technologies GmbH | Heating conductor for heating an exhaust gas flow of an internal combustion engine |
Citations (3)
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GB2313559A (en) * | 1995-02-20 | 1997-12-03 | Emitec Emissionstechnologie | Honeycomb body with channels of differing flow resistances through which a fluid can flow |
WO2008062916A1 (en) * | 2006-11-23 | 2008-05-29 | Il Jin Electric Co., Ltd. | Vehicle exhaust aftertreatment using catalytic coated electric heater |
DE102007025417A1 (en) * | 2007-05-31 | 2008-12-04 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Electrically heatable honeycomb arrangement with support pins |
Family Cites Families (2)
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DE19806033A1 (en) * | 1998-02-13 | 1999-08-19 | Emitec Emissionstechnologie | Arrangement and method for implementing at least one exhaust gas component of an exhaust gas stream of an internal combustion engine |
JP2001244047A (en) * | 2000-02-29 | 2001-09-07 | Denso Corp | Electric heater device |
-
2014
- 2014-05-23 JP JP2014107054A patent/JP6064944B2/en not_active Expired - Fee Related
-
2015
- 2015-05-22 EP EP15169010.4A patent/EP2947288B1/en not_active Not-in-force
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2313559A (en) * | 1995-02-20 | 1997-12-03 | Emitec Emissionstechnologie | Honeycomb body with channels of differing flow resistances through which a fluid can flow |
JPH11500205A (en) | 1995-02-20 | 1999-01-06 | エミテツク ゲゼルシヤフト フユア エミツシオンス テクノロギー ミツト ベシユレンクテル ハフツング | Honeycomb body provided with a plurality of flow paths having different flow resistances passed through by a fluid |
WO2008062916A1 (en) * | 2006-11-23 | 2008-05-29 | Il Jin Electric Co., Ltd. | Vehicle exhaust aftertreatment using catalytic coated electric heater |
DE102007025417A1 (en) * | 2007-05-31 | 2008-12-04 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Electrically heatable honeycomb arrangement with support pins |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3108678A1 (en) * | 2020-03-31 | 2021-10-01 | Faurecia Systemes D'echappement | Heater for an exhaust gas purification device |
US11352925B2 (en) | 2020-03-31 | 2022-06-07 | Faurecia Systemes D'echappement | Heating element for an exhaust gas purification device |
WO2023046631A1 (en) * | 2021-09-27 | 2023-03-30 | Vitesco Technologies GmbH | Heating conductor for heating an exhaust gas flow of an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
EP2947288B1 (en) | 2017-06-28 |
JP6064944B2 (en) | 2017-01-25 |
JP2015222053A (en) | 2015-12-10 |
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