JP2015148171A - Honeycomb structure, and exhaust emission control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a honeycomb structure for allowing the measurement of the internal temperature with high accuracy and easy replacement of a temperature measuring probe such as a thermoelectric couple.SOLUTION: A honeycomb structure 100 includes a honeycomb base material 10 having a porous partition wall 1 to define a plurality of cells 2 extending from an inflow end face 11 as one end face which forms a flow path for fluid and into which the fluid flows, to an outflow end face 12 as the another end face from which the fluid flows out, a flange part 15 formed encircling an outer periphery of the honeycomb base material 10 and protruding from the outer periphery of the honeycomb base material 10 to the outside, and plugging parts 25 arranged in openings of inlet cells as predetermined cells of the honeycomb material 10 at the side of the outflow end face 12 and in openings of outlet cells as the remaining cells at the side of the inflow end face 11. The flange part 15 is formed with at least one groove part 20 which has an opening in the side face of the flange part 15 and into which a temperature measuring probe is inserted.

Description

  The present invention relates to a honeycomb structure and an exhaust gas purification device. More specifically, the present invention relates to a honeycomb structure and an exhaust gas purification device that can measure the internal temperature with high accuracy and can easily exchange a temperature measurement probe such as a thermocouple.

  Conventionally, exhaust gas purification apparatuses that purify exhaust gas by removing fine particles contained in exhaust gas discharged from various engines and the like are known. As a filter element of this exhaust gas purification apparatus, there is a honeycomb structure having a honeycomb substrate having a plurality of cells partitioned by partition walls, a plugging portion, and a flange portion formed on the outer periphery of the honeycomb substrate. (For example, refer to Patent Document 1). In this honeycomb structure, when exhaust gas containing fine particles flows from one end side thereof, the fine particles are filtered by the partition walls, and the purified gas is discharged from the other end side. In this way, the exhaust gas purification device purifies the exhaust gas.

  In the exhaust gas purification device, a thermocouple is used behind the honeycomb structure to grasp the temperature inside the honeycomb structure, and this thermocouple measures the temperature of the gas discharged from the honeycomb structure. It is known to do (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 9-150024 JP-A-6-10654

  However, since the exhaust gas purifying apparatus described in Patent Document 2 measures the temperature of the gas discharged from the honeycomb structure, there is an error between the measured gas temperature and the temperature inside the honeycomb structure. It was happening. That is, since the temperature of the honeycomb structure is not directly measured, there may be a deviation between the temperature of the exhaust gas to be measured and the temperature inside the honeycomb structure. Therefore, the temperature inside the honeycomb structure, in other words, the temperature of the catalyst supported on the partition walls of the honeycomb structure cannot be accurately grasped. As a result, it is necessary to provide a margin for the determination of catalyst deterioration. That is, if the catalyst is exposed to a predetermined temperature or more for a predetermined period or longer, the catalyst deteriorates and the catalyst function cannot be sufficiently obtained. For this reason, a criterion for catalyst degradation is set based on temperature information from the thermocouple, and the presence or absence of catalyst degradation is determined. This “catalyst degradation criterion” is set with a margin more than necessary because the temperature is deviated as described above.

  For this reason, it is possible to measure the temperature inside the honeycomb structure with high accuracy, and when the temperature measurement probe such as a thermocouple is damaged, the honeycomb structure can be easily replaced. And development of an exhaust gas purification device was eagerly desired.

  The present invention has been made in view of such problems of the prior art. An object of the present invention is to provide a honeycomb structure and an exhaust gas purifying apparatus that can measure the internal temperature with high accuracy and can easily replace the temperature measurement probe.

  According to the present invention, the following honeycomb structure and exhaust gas purification device are provided.

[1] A honeycomb base having a porous partition wall that defines a plurality of cells that serve as a fluid flow path and extend from an inflow end surface that is one end surface into which the fluid flows in to an outflow end surface that is the other end surface from which the fluid flows out Material, a flange portion that surrounds the outer periphery of the honeycomb base material and protrudes outward from the outer periphery of the honeycomb base material, and an opening on the outflow end face side of an inlet cell that is a predetermined cell of the honeycomb base material And a plugging portion disposed in the opening portion of the inflow end surface of the outlet cell, which is a remaining cell, and a temperature measurement probe having an opening portion on a side surface of the flange portion. A honeycomb structure in which at least one groove is formed.

[2] The honeycomb structure according to [1], wherein a depth of the groove portion formed in the flange portion is a value equal to or less than a height value of the flange portion.

[3] The honeycomb structure according to [1] or [2], wherein an opening of the groove portion formed in the flange portion has a length in the circumferential direction of the honeycomb base material of 0.5 to 20 mm. .

[4] The length according to any one of [1] to [3], wherein a length of the opening of the groove formed in the flange portion in a cell extending direction of the honeycomb base material is 0.5 mm or more. Honeycomb structure.

[5] The honeycomb structure according to any one of [1] to [4], an inflow port into which exhaust gas flows, an outflow port from which purified exhaust gas flows out, and between the inflow port and the outflow port And a can body that houses the honeycomb structure in the body portion, and the body portion of the can body fits the flange portion of the honeycomb structure body. And at least one through hole having an opening having an area larger than the area of the opening of the groove formed in the flange portion of the honeycomb structure is formed in the convex portion, Is disposed at a position where the groove portion formed in the flange portion and the through hole of the convex portion of the can body communicate with each other, and further, passes through the through hole of the convex portion of the can body, Inserted into the groove portion of the flange portion of the honeycomb structure. An exhaust purification device comprises a temperature measuring probe for measuring the temperature of the honeycomb structure portion.

  In the honeycomb structure of the present invention, a groove portion is formed in the honeycomb base material, and a temperature measurement probe can be inserted into the groove portion and disposed inside the honeycomb structure, so that the temperature inside the honeycomb structure can be directly measured. As a result, the temperature inside the honeycomb structure can be measured with high accuracy. In addition, the honeycomb structure of the present invention can be easily replaced by removing a temperature measurement probe such as a thermocouple inserted in the groove and then inserting a new temperature measurement probe into the groove. It is.

  In the exhaust gas purifying apparatus of the present invention, a groove is formed in the honeycomb base material of the honeycomb structure, and a temperature measurement probe can be inserted into the groove to be disposed inside the honeycomb structure, so that the temperature inside the honeycomb structure can be directly measured. . As a result, the temperature inside the honeycomb structure can be measured with high accuracy. Further, the exhaust gas purifying apparatus of the present invention extracts the temperature measuring probe inserted into the through hole of the can body and the groove portion of the honeycomb base material of the honeycomb structure, and then inserts the new temperature measuring probe into the through hole of the can body. Therefore, the probe for temperature measurement can be easily replaced because it can be inserted into the groove of the honeycomb substrate of the honeycomb structure.

1 is a perspective view schematically showing an embodiment of a honeycomb structure of the present invention. Fig. 3 is a cross-sectional view schematically showing a cross section parallel to the cell extending direction in one embodiment of the honeycomb structure of the present invention. 1 is a cross-sectional view schematically showing a cross section parallel to a cell extending direction of a honeycomb structure in an embodiment of an exhaust gas purification apparatus of the present invention. It is a schematic diagram which shows the arrangement | sequence of the engine, DOC, and exhaust gas purification apparatus in a temperature measurement test. It is a graph which shows the measurement conditions (time, engine torque, engine speed) in a temperature measurement test. [Fig. 3] Fig. 3 is a plan view schematically showing a temperature measurement position in a temperature measurement test as seen from one end face side of the honeycomb structure. It is sectional drawing which shows typically the A-A 'cross section shown to FIG. 6A. [Fig. 3] Fig. 3 is a plan view schematically showing a temperature measurement position in a temperature measurement test as seen from one end face side of the honeycomb structure. FIG. 6B is an enlarged view schematically showing a part of FIG. 6B in an enlarged manner.

  Embodiments of the present invention will be described below. The present invention is not limited to the following embodiments, and appropriate modifications and improvements are added to the following embodiments on the basis of ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that what has been described also falls within the scope of the invention.

[1] Honeycomb structure:
One embodiment of the honeycomb structure of the present invention is a honeycomb structure 100 shown in FIGS. The honeycomb structure 100 is formed so as to surround the outer periphery of the honeycomb base material 10 having the porous partition walls 1 that define the plurality of cells 2 and project outward from the outer periphery of the honeycomb base material 10. And a flange portion 15. The partition wall 1 defines a plurality of cells 2 that serve as a fluid flow path and extend from an inflow end surface 11 that is one end surface into which fluid flows in to an outflow end surface 12 that is the other end surface from which fluid flows out. The plugging portion 25 is disposed in the opening on the outflow end surface 12 side of the inlet cell, which is a predetermined cell of the honeycomb substrate 10, and in the opening portion of the inflow end surface 11 of the outlet cell, which is the remaining cell. In the honeycomb structure 100, at least one groove 20 for inserting a temperature measurement probe having an opening on the side surface of the flange 15 is formed in the flange 15.

  The temperature inside the honeycomb structure is actually not uniform in the axial direction of the honeycomb structure (that is, the direction in which the cells of the honeycomb structure extend) and in the radial direction. In other words, the temperature of the catalyst supported on the partition walls of the honeycomb structure is not uniform in the axial direction and the radial direction of the honeycomb structure. That is, the temperature inside the honeycomb structure (particularly partition walls) is not uniform, and a temperature distribution exists inside the honeycomb structure. Therefore, a temperature measuring probe (hereinafter simply referred to as “measuring probe”) such as a thermocouple, which is disposed several tens of millimeters downstream of the honeycomb structure as in the past (ie, disposed outside the honeycomb structure). It is difficult to accurately grasp the temperature inside the honeycomb structure. As a result, there is a problem that a large error occurs between the temperature of the exhaust gas to be measured and the temperature inside the honeycomb structure. Thus, it has been difficult to accurately grasp the temperature inside the honeycomb structure, in other words, the temperature of the catalyst supported on the partition walls of the honeycomb structure. As a result, it is necessary to provide a margin for the determination of catalyst deterioration. That is, if the catalyst is exposed to a predetermined temperature or more for a predetermined period or longer, the catalyst deteriorates and the catalyst function cannot be sufficiently obtained. For this reason, a reference for catalyst deterioration is set based on temperature information from a measurement probe such as a thermocouple, and the presence or absence of catalyst deterioration is determined. This “catalyst degradation criterion” is set with a margin more than necessary because the temperature is deviated as described above. Thus, it is necessary to estimate a large amount of the catalyst to be supported in consideration of the temperature error. That is, the catalyst may be wasted. On the other hand, in the honeycomb structure 100, the groove portion 20 is formed in the flange portion 15, and the thermocouple (measurement probe) 30 (see FIG. 3) can be inserted into the groove portion 20 so that the honeycomb structure 100 can be disposed inside the honeycomb structure. The temperature inside 100 can be measured directly. As a result, the temperature inside the honeycomb structure 100 can be measured with high accuracy. Moreover, it is possible to prevent the catalyst from being wasted.

  In addition, the honeycomb structure 100 can be easily replaced because the thermocouple 30 inserted into the groove portion 20 is extracted and then a new thermocouple 30 is inserted into the groove portion 20. For example, it is easy to repair a thermocouple when it fails.

  Furthermore, even in the conventional technique, it is possible to insert a measurement probe into the honeycomb structure. In this case, the measurement probe is inserted from the exit end face side. However, when the measurement probe is inserted, the measurement probe may come into contact with the partition wall and the partition wall may be damaged. In addition, since the measurement probe is inserted along the cell which is the exhaust gas flow path, there is a problem that the flow path resistance is increased, resulting in an increase in pressure loss. Further, since the measurement probe is inserted into the cell as described above, a long measurement probe is required, resulting in an increase in cost. Further, when the measurement probe becomes longer, the influence of the flow of exhaust gas becomes larger. Specifically, the measurement probe moves in the cell due to the exhaust gas, and the honeycomb structure (partition wall) is damaged. Furthermore, the measurement probe needs to be inserted into a specific cell. In this case, the measurement probe needs to be inserted after dismantling the converter. Therefore, cost and work time will be required.

  FIG. 1 is a perspective view schematically showing one embodiment of a honeycomb structure of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section parallel to the cell extending direction in one embodiment of the honeycomb structure of the present invention.

[1-1] Flange part:
The flange portion surrounds the outer periphery of the honeycomb substrate and is formed to protrude outward from the outer periphery of the honeycomb substrate. By having such a flange portion, a stopper for fixing the position of the honeycomb structure (particularly the position in the central axis direction of the honeycomb structure) when the honeycomb structure is housed in the can body becomes unnecessary. In the honeycomb structured body of the present invention, the honeycomb structure is prevented from moving (displaced) in the direction of the central axis by the flange portion.

  The flange portion may surround “all” of the outer periphery of the honeycomb substrate. In this case, the outer shape of the flange portion can be said to be a shape in which the central portion of the disc (column) is hollowed out. Further, the flange portion may surround a part of the outer periphery of the honeycomb base material. That is, the flange part may be interrupted in the middle in the circumferential direction of the honeycomb substrate.

  The flange portion may be a so-called solid one whose inside is clogged, or the inside thereof may have a honeycomb structure. When the inside is a honeycomb structure, the flange portion has a flange partition wall that is a partition wall that defines a plurality of cells (flange cells), and the flange cell is a cell extending in the same direction as the cells of the honeycomb substrate. Can do. When a plurality of flange cells are formed, it is preferable that all the openings at both ends of the flange cell are plugged.

  The thickness (the thickness of the flange portion, that is, the length in the diameter direction) H (see FIG. 2) H (see FIG. 2) of the flange portion in a cross section perpendicular to the cell extending direction of the honeycomb structure is 1 to 30 mm. It is preferable that it is 25 mm, and it is especially preferable that it is 5-20 mm. If the thickness H of the flange portion in the cross section perpendicular to the cell extending direction is less than 1 mm, the flange portion is thin, and there is a possibility that the thermocouple cannot be inserted. Further, it may be difficult to prevent the honeycomb structure from being displaced in the can. If it exceeds 30 mm, it may be difficult to assemble the pipe or handle. When the outer peripheral coat layer is disposed on the honeycomb structure 100, the “thickness H in the cross section perpendicular to the cell extending direction of the flange portion” is the thickness based on the position of the surface of the outer peripheral coat layer. That's it.

  The length (flange portion width) L (see FIG. 2) of the flange portion in the cell extending direction of the honeycomb structure is preferably 1 to 90% of the length of the honeycomb structure cell extending direction. 3 to 50% is more preferable, and 5 to 30% is particularly preferable. When the width of the flange portion is within the above range, the honeycomb structure can be satisfactorily fixed in a limited space under the floor of an automobile or the like. Further, since the flange portion is not too large, the honeycomb structure can be reduced in weight. If the width of the flange portion is less than 1%, the strength of the flange portion may decrease. If it exceeds 90%, the honeycomb structure may be enlarged, and the honeycomb structure may not be satisfactorily fixed in a limited space under the floor of an automobile or the like. When the outer peripheral coat layer is disposed on the honeycomb structure, the width of the flange portion is a thickness based on the position of the surface of the outer peripheral coat layer. In addition, when the edge part of a flange part is a taper shape, as shown in FIG. 2, "width of a flange part" is the distance between both front-end | tips of a taper-shaped both ends.

  In the honeycomb structure 100, the flange portion 15 has a tapered shape in which both end surfaces (both end portions) in the cell 2 extending direction have a diameter that decreases toward the tip. In the honeycomb structure, both end surfaces in the cell extending direction are not tapered in the honeycomb structure, and both end surfaces in the cell extending direction of the honeycomb substrate may be orthogonal to the cell extending direction. .

  In a plane including the central axis of the honeycomb substrate, the angle θ (see FIG. 2) between the end face of the flange portion and the side surface of the honeycomb substrate is preferably 90 to 150 °, more preferably 90 to 140 °, and more preferably 90 to 135. ° is particularly preferred. Furthermore, 90 to 130 ° is most preferable. In addition, the angle θ between the end face of the flange portion and the side surface of the honeycomb substrate is 90 ° when the end face of the flange portion is orthogonal to the cell extending direction.

  The flange portion may be arranged at any position on the honeycomb substrate in the cell extending direction of the honeycomb substrate. For example, it may be disposed at the center of the honeycomb substrate, may be disposed at the end, or may be disposed at the center of the honeycomb substrate as shown in FIGS. Also good. Note that the central portion of the honeycomb base material is the central portion in the direction in which the cells of the honeycomb base material extend.

  As described above, at least one groove 20 for inserting a thermocouple is formed in the flange portion 15. The “groove portion” is a hole for inserting a thermocouple for measuring the temperature inside the honeycomb structure, and more specifically, a hole that fits with a thermocouple (particularly, a tip portion of a sensor of the thermocouple). .

  The shape of the opening of the groove is not particularly limited as long as a thermocouple can be inserted. That is, the shape of the opening of the groove can be appropriately set according to the shape of the thermocouple. Examples of the shape of the opening of the groove include a circle, an ellipse, a square, and a rectangle. In addition, when the shape of the opening is a rectangle, the groove can also be referred to as a “slit”. The groove 20 shown in FIGS. 1 and 2 is an example in which the shape of the opening is circular.

  There is no restriction | limiting in particular about the groove part's extending direction (namely, direction where the central axis of a groove part extends). For example, the groove portion has an opening formed on the side surface 21 (see FIGS. 1 and 2) of the flange portion, and the central axis of the groove portion is orthogonal to the side surface of the flange portion in a cross section orthogonal to the cell extending direction of the honeycomb structure. It may extend so that. Further, the groove portion has an opening formed in the end surface 23 (see FIGS. 1 and 2) of the flange portion, and the center axis of the groove portion is orthogonal to the end surface of the flange portion in a cross section orthogonal to the cell extending direction of the honeycomb structure. It may extend so that. Furthermore, the groove portion may extend so that the central axis of the groove portion passes through the center of the honeycomb structure in a cross section orthogonal to the cell extending direction of the honeycomb structure.

  The length of the groove portion in the circumferential direction of the honeycomb substrate (hereinafter sometimes referred to as “width of the groove portion”) is preferably 0.5 to 20 mm, and more preferably 0.5 to 5 mm. And 0.5 to 1.0 mm is particularly preferable. If the width of the groove is less than the lower limit, a measurement probe such as a thermocouple may not be inserted. There exists a possibility that the intensity | strength of a flange part may fall that the width | variety of a groove part is more than the said upper limit. “The length of the groove portion in the circumferential direction of the honeycomb substrate” means that when a plurality of “the length of the groove portion in the circumferential direction of the honeycomb substrate” is obtained in one groove portion, that is, the length of the groove portion in one groove portion is Is not uniform, it means the maximum length of “the length of the groove portion in the circumferential direction of the honeycomb substrate”.

  The length N of the groove portion in the cell extending direction of the honeycomb base material (hereinafter sometimes referred to as “the length of the groove portion”) N is preferably 0.5 mm or more. Further, the upper limit of the length of the groove portion is preferably the same as the width of the flange portion, and particularly preferably 50% of the width of the flange portion. If the length of the groove is less than the lower limit, a measurement probe such as a thermocouple may not be inserted. “The length of the groove portion in the cell extending direction of the honeycomb substrate” means that when “the length of the groove portion in the extending direction of the cell of the honeycomb substrate” is obtained in one groove portion, The maximum length of the “length in the extending direction of the cell of the substrate”. “When a plurality of grooves are obtained in one groove” means that “the length of the groove in the cell extending direction of the honeycomb substrate” is not uniform even in one groove.

  The groove is not particularly limited as long as it is formed in the flange. That is, the groove part may extend to the honeycomb substrate beyond the flange part. Moreover, the groove part may be formed only in the flange part. That is, the depth of the groove portion may be a value equal to or less than the height value of the flange portion. Of these, the groove is preferably formed only in the flange. In this way, when the thermocouple is inserted by extending the groove portion to the honeycomb base material, the pressure loss increases due to the thermocouple blocking the cell, or the exhaust gas flowing in the honeycomb base material cell It is possible to prevent leakage through the honeycomb structure to the outside. In addition, when the groove part extends to the honeycomb base material beyond the flange part, the temperature of the exhaust gas flowing in the cells of the honeycomb base material can be directly measured.

  The depth of the groove portion is preferably 20 to 100% of the height value of the flange portion, more preferably 30 to 100%, and particularly preferably 50 to 100%. If the depth of the groove is less than the lower limit, the temperature inside the honeycomb substrate may not be accurately estimated. If the depth of the groove part exceeds the upper limit, exhaust gas may flow out of the honeycomb structure through the groove part. Further, the pressure loss may increase due to the measurement probe obstructing the flow of exhaust gas in the cell. Note that when a plurality of “groove depths” are obtained in one groove portion, that is, when the depth is not uniform even in one groove portion, the depth at the position where the distance from the opening of the groove portion is farthest. Say.

  The number of the groove portions is preferably 1 to 4, more preferably 1 to 3, and particularly preferably 1 or 2. By forming a plurality of groove portions, the temperature inside the honeycomb structure can be measured more accurately. In particular, when the converter shape and the exhaust gas flow are not uniform in the direction perpendicular to the cell extending direction, the temperature inside the honeycomb structure can be accurately measured by forming a plurality of grooves.

  When a plurality of groove portions are formed, each groove portion may have the same shape or may be different.

  Since the groove portion is formed in the flange portion, the position of the groove portion is defined by the flange portion. The position where the groove portion is formed (the position in the cell extending direction of the honeycomb substrate) is as follows. It is preferable. That is, the position of the groove portion in the cell extending direction of the honeycomb base material (the position at which the groove portion is formed) is such that the distance from the inflow end surface is within the range of 5 to 95% of the length of the honeycomb base material cell extending direction. It is preferable that The “position for forming the groove” is more preferably within a range of 10 to 90% of the length in the cell extending direction of the honeycomb base material, and the distance from the inflow end surface is 10 to 50%. It is particularly preferable that it is within the range. If the “position for forming the groove” is less than the lower limit, the measurement accuracy may not be sufficiently improved if the “position for forming the groove” exceeds the upper limit.

  In addition to the temperature measurement probe, a sensor that can detect the type and concentration of a specific gas can be inserted into the groove.

[1-2] Honeycomb substrate:
The thickness of the partition walls 1 of the honeycomb substrate 10 is preferably 120 to 500 μm, more preferably 200 to 450 μm, and particularly preferably 250 to 400 μm. If the thickness of the partition wall 1 is less than 120 μm, the strength of the partition wall 1 may be insufficient. On the other hand, if it exceeds 500 μm, the pressure loss may increase.

  The porosity of the partition walls 1 of the honeycomb substrate 10 is preferably 30 to 75%, more preferably 35 to 70%, and particularly preferably 40 to 65%. If the porosity is less than 30%, pressure loss may increase. On the other hand, if it exceeds 75%, the strength of the partition wall 1 may decrease. Here, in this specification, “porosity” is a value measured with a mercury porosimeter.

  The average pore diameter of the partition walls 1 of the honeycomb substrate 10 is preferably 5 to 35 μm, more preferably 8 to 30 μm, and particularly preferably 10 to 25 μm. There exists a possibility that a pressure loss may increase that the said average pore diameter is less than 5 micrometers. On the other hand, if it exceeds 35 μm, the exhaust gas purification performance may be reduced. Here, the “average pore diameter” in the present specification is a value measured with a mercury porosimeter.

The cell density of the honeycomb base material 10 is preferably from 15 to 70 cells / cm ^2, further preferably 30 to 65 cells / cm ^2, and particularly preferably 38 to 55 cells / cm ^2. If the cell density is less than 15 cells / cm ² , the pressure loss after soot deposition may increase. On the other hand, if it exceeds 70 cells / cm ² , the pressure loss may increase.

  As a material for the partition wall, a ceramic material is preferable. From the viewpoint of excellent strength and heat resistance, selected from the group consisting of cordierite, silicon carbide, silicon-silicon carbide based composite material, mullite, alumina, aluminum titanate, silicon nitride, and silicon carbide-cordierite based composite material More preferably, at least one selected from the above is used. Among these, cordierite is preferable.

  The shape of the cell 2 in the cross section orthogonal to the extending direction of the cell 2 of the honeycomb base material 10 can be a square shape, a hexagonal shape, or the like.

  The length in the cell extending direction of the honeycomb substrate 10 (honeycomb structure 100) can be set to 50 to 400 mm. Moreover, when the end surface of the honeycomb structure 100 is circular, the diameter of the end surface can be set to 100 to 400 mm.

  The shape of the honeycomb substrate 10 may be a columnar shape, an elliptical column shape, a quadrangular column shape, a hexagonal column shape, or the like. Among these, a cylindrical shape and a quadrangular prism shape are preferable.

[1-3] Plugging portion:
The honeycomb structure 100 is arranged in an opening on the outflow end face 12 side of an inlet cell that is a predetermined cell 2 of the honeycomb substrate 10 and an opening on an inflow end face 11 of an outlet cell that is a remaining cell 2. The sealing part 25 is provided.

  The arrangement state of the plugged portion is not particularly limited as long as the plugged portion is formed so as to plug the cell at either the inflow end surface side or the outflow end surface side. For example, the plugging portion 25 is preferably arranged so that the inlet cells and the outlet cells are alternately arranged.

  The depth of the plugged portion (the length in the cell extending direction) is preferably 1 to 20 mm, more preferably 2 to 15 mm, and particularly preferably 3 to 10 mm.

  The material of the plugging portion can be the same as that of the partition wall.

  The honeycomb structure 100 shown in FIG. 1 and FIG. 2 has the outer peripheral coat layer 26, but may not have the outer peripheral coat layer 26. The outer peripheral coat layer 26 can be formed by applying a ceramic material to the outer periphery of the honeycomb structure. Further, when the honeycomb structure is integrally formed by extrusion molding or the like, the outer peripheral coat layer 26 may be formed together with partition walls in the process of manufacturing the honeycomb substrate 10.

[1-4] Catalyst:
In the honeycomb structure of the present invention, a catalyst may be supported on the surfaces of the partition walls of the honeycomb base material or the inner surfaces of the pores of the partition walls.

Examples of the catalyst include a three-way catalyst, a NO _X storage reduction catalyst, an oxidation catalyst, and a NO _X selective reduction catalyst. In addition to the catalyst described above, it is possible to appropriately select an appropriate catalyst type for the oxidation of harmful components and soot in exhaust gas and the purification of NOx.

  The honeycomb structure of the present invention may have a “segment-structure honeycomb substrate” as in the honeycomb structure 100 shown in FIGS. 1 and 2, or may be formed integrally by extrusion or the like. It may have a substrate. A honeycomb structure 100 shown in FIGS. 1 and 2 includes a honeycomb substrate 10 having a plurality of honeycomb segments 22 and a bonding layer 24 that bonds the plurality of honeycomb segments 22 to each other.

[2] Exhaust gas purification device:
One embodiment of the exhaust gas purifying apparatus of the present invention is an exhaust gas purifying apparatus 200 shown in FIG. The exhaust gas purification apparatus 200 includes the above-described honeycomb structure 100 and a can body 150 that houses the honeycomb structure 100. The can body 150 includes an inlet 51 through which exhaust gas flows, an outlet 52 through which purified exhaust gas flows out, and a trunk portion 53 positioned between the inlet 51 and the outlet 52. The structure 100 is accommodated. The body portion 53 of the can body 150 has a convex portion 54 that fits with the flange portion 15 of the honeycomb structure 100. The convex portion 54 is formed with at least one through hole 55 having an opening having an “area larger than the area of the opening of the groove portion 20 formed in the flange portion 15 of the honeycomb structure 100”. The honeycomb structure 100 is disposed at a position where the groove portion 20 formed in the flange portion 15 communicates with the through hole 55 of the convex portion 54 of the can body 150. The exhaust gas purifying apparatus 200 is further inserted into the groove portion 20 of the flange portion 15 of the honeycomb structure 100 through the through hole 55 of the convex portion 54 of the can body 150 and disposed inside the honeycomb structure body. Is provided with a thermocouple (measuring probe) 30 for measuring the temperature. Fig. 3 is a cross-sectional view schematically showing a cross section parallel to the cell extending direction of the honeycomb structure in one embodiment of the exhaust gas purifying apparatus of the present invention.

  In such an exhaust gas purifying apparatus 200, the groove portion 20 is formed in the honeycomb base material 10 of the honeycomb structure 100, and the thermocouple 30 can be inserted into the groove portion 20 to be disposed inside the honeycomb structure 100. Can be measured directly. As a result, the temperature inside the honeycomb structure 100 can be measured with high accuracy. Moreover, since the exhaust gas purification apparatus 200 can replace the thermocouple (measuring probe) 30 by the following operation, the measuring probe can be easily replaced. That is, the through hole 55 of the can body 150 and the thermocouple 30 inserted in the groove portion 20 of the honeycomb base material 10 of the honeycomb structure 100 are extracted, and then the new thermocouple 30 is replaced with the through hole 55 of the can body 150 and the honeycomb structure. What is necessary is just to insert in the groove part 20 of the honeycomb base material 10 of the body 100. FIG. As described above, the exhaust gas purifying apparatus 200 can easily exchange a measurement probe such as a thermocouple.

  “A through-hole having an opening having an area larger than the area of the opening of the groove” means that the through-hole has the following opening. That is, the position of the can body and the honeycomb structure is adjusted, and the honeycomb structure is positioned so that the groove portion and the through hole of the can body communicate with each other. At that time, the through-hole has an opening having an area such that the area of the opening of the through-hole is too small so that a part of the groove is not covered by the body (convex portion) of the can body. Means that. That is, it is possible to prevent the groove portion from being covered with the body portion (convex portion) of the can body.

[2-1] Can body:
As described above, the can body is formed with at least one through hole having an opening having an area larger than the area of the opening of the groove formed in the honeycomb base material of the honeycomb structure.

  The through holes of the can body are preferably formed in the same shape, the same number, and the same arrangement as the openings of the groove portions formed in the honeycomb substrate (see FIG. 3).

  In the exhaust gas purifying apparatus of the present invention, the honeycomb structure is stored in a fixed state in the can while being held by a holding material arranged so as to cover the outer peripheral surface thereof.

  The can body 150 of the exhaust gas purifying apparatus 200 further includes an expanded tube portion 56 whose diameter gradually increases from the inlet 51 to the trunk portion 53 and a narrow tube portion 57 whose diameter gradually decreases from the trunk portion 53 to the outlet 52. .

  For example, the material of the can body 150 is preferably made of stainless steel, and particularly preferably made of chromium-based or chromium-nickel-based stainless steel.

[2-2] Measurement probe:
The measurement probe is not particularly limited as long as the sensor portion is large enough to be inserted into the groove portion of the honeycomb structure, and a conventionally known measurement probe can be used. Examples of the measurement probe include a temperature measurement probe. Examples of the temperature measuring probe include a thermocouple and a thermistor. Examples of the thermocouple include a K thermocouple, a J thermocouple, a T thermocouple, an E thermocouple, an N thermocouple, and an R thermocouple. A sensor having a diameter of 0.5 mm or the like can be used as a sensor (a part inserted into the groove) of these thermocouples or thermistors.

[3] Manufacturing method of honeycomb structure:
The honeycomb structure of the present invention can be manufactured as follows, for example. A segmented honeycomb structure will be described.

  First, a kneaded material for preparing a honeycomb base material is prepared, and this kneaded material is formed to prepare a honeycomb segment formed body (forming step).

  Next, the obtained honeycomb segment formed body (or the dried honeycomb segment dried body as necessary) is fired to produce a plurality of honeycomb segment fired bodies (honeycomb segment fired body producing step).

  Next, a plurality of honeycomb segment fired bodies are joined with a joining material to produce a honeycomb segment joined body (joining step).

  The material of the bonding material is not particularly limited, but an organic binder, a foamed resin, a dispersant, and the like are added to ceramic particles such as inorganic fibers, colloidal silica, clay, SiC particles and cordierite particles, and water is further added and kneaded. A slurry or the like is preferable.

  Next, in the joined honeycomb segment assembly, a plugging material is disposed by filling a plugging material into an opening of a “predetermined cell” on one end face and an opening of a “remaining cell” on the other end face. To do.

  The plugging material can be prepared by appropriately mixing the raw materials listed as the constituent elements of the ceramic forming raw material. The ceramic raw material contained in the plugging material is preferably the same as the ceramic raw material used as the raw material for the partition walls.

  It is preferable that cells having plugged portions and cells having no plugged portions are alternately arranged on one end face of the joined honeycomb segment assembly. In this case, a checkered pattern is formed by the plugged portion and the “cell opening” on one end face where the plugged portion is formed.

  Next, a flange portion forming material is applied to the outer periphery of the joined honeycomb segment assembly to form a solid flange portion. The solid flange portion surrounds the outer periphery of the joined honeycomb segment assembly and is formed to protrude outward from the outer periphery of the joined honeycomb segment assembly. The same material as the ceramic forming raw material described above can be adopted as the flange portion forming material.

  The flange portion can be formed by applying the flange portion forming material as described above, but may be formed by cutting a part of the outer peripheral portion of the joined honeycomb segment assembly. That is, a part of the outer peripheral portion of the joined honeycomb segment assembly may be left without being cut, and a portion that is not cut (remaining portion) may be used as the flange portion. In this way, it is possible to easily form the flange portion having the above-described “porous flange partition walls that define and form a plurality of flange cells”.

  Next, a groove part is formed in the formed flange part by cutting.

[4] Manufacturing method of exhaust gas purification device:
The exhaust gas purification apparatus of the present invention can be manufactured, for example, as follows.

  First, a honeycomb structure is manufactured as described above. Next, the outer peripheral surface of the manufactured honeycomb structure is wrapped with a holding material such as a ceramic fiber mat and pressed into the body of the can body. In the can body, a convex portion is formed in the body portion as described above, and a through hole is formed in the convex portion. When the honeycomb structure is press-fitted into the can body, the honeycomb structure body is adjusted and disposed at a position where the groove formed in the honeycomb base material and the through hole of the can body communicate with each other. Next, the tip of the thermocouple sensor is passed through the through hole of the can body and inserted into the groove of the honeycomb substrate of the honeycomb structure. In this way, the exhaust gas purification apparatus of the present invention can be produced.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited to these Examples.

Example 1
Silicon carbide (SiC) powder and metal silicon (Si) powder were mixed at a mass ratio of 80:20 to obtain a ceramic raw material. To the obtained ceramic raw material, hydroxypropylmethylcellulose as a binder and a water-absorbing resin as a pore former were added, and water was added as a forming raw material, and the forming raw material was kneaded with a vacuum kneader to prepare a clay. . The binder content is 7 parts by mass when the total of silicon carbide (SiC) powder and metal silicon (Si) powder is 100 parts by mass, and the pore former content is silicon carbide (SiC) powder and metal silicon. When the total amount of (Si) powder is 100 parts by mass, the content of water is 42 parts by mass when the total of silicon carbide (SiC) powder and metal silicon (Si) powder is 100 parts by mass. Was part.

  Next, the obtained kneaded material was molded using an extrusion molding machine to obtain a honeycomb molded body. The obtained honeycomb formed body was dried by high-frequency dielectric heating and then dried at 120 ° C. for 2 hours using a hot air dryer, and both end surfaces were cut by a predetermined amount. Next, the dried honeycomb formed body was degreased and fired to obtain a honeycomb fired body. The degreasing conditions were 550 ° C. for 3 hours. The firing conditions were 1450 ° C. and 2 hours in an argon atmosphere. In this way, a honeycomb segment fired body was obtained. Then, 16 such honeycomb segment fired bodies were produced.

  All of the obtained honeycomb segment fired bodies had a square shape with a cross section perpendicular to the cell extending direction of 36 mm on a side, and the length in the cell extending direction was 152 mm.

  Next, with respect to the obtained 16 honeycomb segment fired bodies, the respective side surfaces are bonded with a bonding material (4 vertical × 4 horizontal), dried, and the cross-sectional shape orthogonal to the central axis is square. A joined honeycomb segment assembly (a rectangular column shaped honeycomb segment assembly) was obtained. As the bonding material, a material obtained by further mixing an inorganic binder, a dispersant, and water with a mixture of an organic binder and a foamed resin, and kneading with a mixer for 30 minutes was used.

  Next, the outer peripheral portion of the obtained rectangular columnar honeycomb segment bonded body was cut to obtain a cylindrical honeycomb segment bonded body. Thereafter, an outer peripheral coating material was applied to the outer peripheral portion of the cylindrical honeycomb segment bonded body to form an outer peripheral coating layer.

  Next, with respect to the obtained cylindrical honeycomb segment bonded body, plugged honeycomb segment bonded bodies are formed by forming plugged portions at one end of a predetermined cell and the other end of the remaining cells. Got. The predetermined cells and the remaining cells are arranged alternately (alternately) so that a checkered pattern is formed on both end faces by the opening portions of the cells and the plugging portions. As the plugging filler, the same raw material as that for the honeycomb segment fired body was used.

  Next, a flange portion forming material was applied to a part of the outer periphery of the plugged honeycomb segment bonded body (the center portion in the cell extending direction) to form a solid flange portion. In this way, a solid honeycomb segment bonded body was obtained. The solid flange portion surrounds the entire outer periphery of the joined honeycomb segment assembly and is formed so as to protrude outward from the outer periphery of the joined honeycomb segment assembly. The solid flange portion was formed without interruption in the middle in the circumferential direction of the plugged honeycomb segment bonded body. The same raw material as that of the honeycomb segment fired body was used as the flange portion forming material.

  Thereafter, an outer periphery coating material was applied to the surface of the flange portion of the obtained solid honeycomb segment bonded body to form a flange portion coat layer.

  Next, drilling was performed on the flange portion of the “solid honeycomb segment joined body” on which the flange portion coat layer was formed to form one groove portion. The groove portion had an opening on the side surface of the flange portion, and the central axis of the groove portion was “a straight line passing through the center of the honeycomb structure in a cross section perpendicular to the cell extending direction of the honeycomb structure”. The groove portion had a circular shape of the opening, and the diameter of the opening was 1 mm. That is, the width of the groove portion (the length of the groove portion in the circumferential direction of the honeycomb substrate) was 1 mm. The length of the groove (the length of the groove in the cell extending direction of the honeycomb base material) was 1 mm. The depth of the groove was 5 mm. The formation position of the groove part (position in the length direction of the groove part) was a position where the distance in the cell extending direction of the honeycomb structure from the inflow end surface to the groove part was 76 mm. In this way, a honeycomb structure was produced.

  The honeycomb substrate of the obtained honeycomb structure had a cylindrical shape with a diameter of 144 mm in a cross section perpendicular to the cell extending direction and a length of 152 mm in the cell extending direction.

  The length (flange portion width) L of the flange portion in the cell extending direction of the honeycomb substrate was 20 mm. The maximum thickness (the height of the flange portion; the length in the diameter direction) H in the cross section orthogonal to the extending direction of the honeycomb base cell of the flange portion was 6 mm.

  The shortest distance X (see FIG. 2) between one end face of the honeycomb base material and the end face of the flange portion facing the same direction as the one end face of the honeycomb base material was 66 mm. The “shortest distance X” is the shortest distance from the “one end face” to the flange portion when one end face of the honeycomb substrate is used as a reference. Note that “one end face” may correspond to both the inlet end face and the outlet end face, but the “shortest distance X” is the one having the smaller distance to the flange portion.

The partition wall thickness was 0.305 mm. The cell density was 465,000 cells / cm ² . Moreover, the shape of the cell of the honeycomb base material in the cross section orthogonal to the cell extending direction was a square.

  The thickness of the outer peripheral coat layer was 1 mm. Moreover, the thickness of the flange part coat layer was 1 mm. The depth of the plugged portion was 6 mm.

  Next, with respect to the obtained honeycomb structure, a thermocouple (K thermocouple, diameter 0.5 mm) was inserted into the cell from the outlet end face and arranged. The temperature measurement position measured by this thermocouple was “TC-01” shown in FIGS. 6A and 6B. Specifically, “TC-01” is determined as follows. That is, in the cross section perpendicular to the cell extending direction of the honeycomb structure, assuming that the central axis of the honeycomb structure is the origin O (see FIG. 6A) and the X axis and the Y axis are assumed, 18 mm in the X axis direction from the origin, The position was 18 mm in the Y-axis direction. Furthermore, “TC-01” is a position where the distance from the inflow end face is 76 mm. Note that “TC-01” is a measurement target site where the temperature is to be measured. That is, the temperature at the measurement target portion was set as a reference temperature inside the honeycomb structure, and an error between the reference temperature and the temperature measurement position was measured. That is, it can be considered that the temperature inside the honeycomb structure can be measured with higher accuracy as the difference from the temperature measured at the measurement target portion is smaller. FIG. 6A is a plan view schematically showing a temperature measurement position in a temperature measurement test as seen from one end face side of the honeycomb structure. 6B is a cross-sectional view schematically showing an A-A ′ cross section shown in FIG. 6A. In addition, in FIG. 6A-FIG. 8, the groove part is abbreviate | omitted.

  The honeycomb structure had a partition wall porosity of 60%. The porosity is a value measured with a mercury porosimeter.

  Next, a catalyst was supported on the obtained honeycomb structure to produce a honeycomb catalyst body. As the catalyst, a Cu zeolite SCR catalyst (240 g) was used.

  Next, the produced honeycomb catalyst body was accommodated in a cylindrical can body. The can body had an inflow port, an outflow port, and a body portion therebetween, and a through hole was formed in the body portion. The honeycomb catalyst body was disposed at a position where the groove portion and the through hole of the can body communicated with each other. Thereafter, a thermocouple (K thermocouple: 0.5 mm in diameter) was inserted into the groove to produce an exhaust gas purification device.

  The produced exhaust gas purification device was subjected to a “temperature measurement test” by the following method.

[Temperature measurement test]
First, a flow-through honeycomb carrier (DOC) 62 (see FIG. 4) carrying an oxidation catalyst was disposed immediately below a 2-liter diesel engine 60 (see FIG. 4). This DOC was a cylindrical shape having a diameter of 144 mm and a length in the cell extending direction of 76 mm. Further, this DOC had a partition wall thickness of 0.1 mm and a cell density of 620,000 cells / m ² . Then, an exhaust gas purification device 200 (see FIG. 4) is disposed behind the DOC, and a thermocouple 64 (at a position 10 cm behind the honeycomb structure of the exhaust gas purification device (a position 10 cm from the outflow end surface of the honeycomb structure)). (See FIG. 4). FIG. 4 is a schematic diagram showing an arrangement of the engine, the DOC, and the exhaust gas purification device in the temperature measurement test.

  Next, 22 g / L of soot was deposited in the honeycomb catalyst body. The conditions for depositing soot were an engine speed of 2000 rpm and an engine torque of 60 Nm. Next, post-injection was performed for 90 seconds at an engine speed of 1700 rpm and an engine torque of 80 Nm, and then the engine speed was 1000 rpm and the torque was not loaded for 200 seconds (see FIG. 5). The temperature change at this time was measured with a thermocouple. FIG. 5 is a graph showing measurement conditions (time, engine torque, engine speed) in the temperature measurement test of Example 1. In FIG. 5, “DPF IN” indicates the temperature of exhaust gas between the flow-through honeycomb carrier 62 and the exhaust gas purification device 200.

  Then, the maximum difference between the estimated original temperature and the actual temperature was calculated. Specifically, the maximum error between the estimated source temperature and the measured temperature is a minimum of two based on the correlation between the “estimated source temperature (estimated source temperature)” and the “actual temperature inside the honeycomb structure (measured temperature)”. This is a value obtained by performing linear approximation by multiplication and calculating the maximum error between the estimated source temperature and the actually measured temperature. In the case of Comparative Example 1, the “estimation source temperature” is a temperature measured by a thermocouple behind the honeycomb structure. “Actual temperature inside the honeycomb structure” is a temperature (reference temperature) when the inside of the honeycomb structure (position of “TC-01”) is directly measured with a thermocouple. The results are shown in Table 1.

  In Table 1, in the case of Comparative Example 1, “estimated source temperature” is a temperature measured by the thermocouple 64 behind the honeycomb structure (position of TC-OUT). “TC-OUT” in the column of “estimated source temperature” indicates a temperature at a position 10 cm from the outflow end face of the honeycomb structure. In the case of Examples 1-5, the temperature of each part shown in the column of "estimated original temperature" is shown.

  In Table 1, “the position in the circumferential direction of the groove” indicates the position of the groove in the circumferential direction of the honeycomb structure. “A”, “B”, and “C” in the “Position of circumferential direction of groove” are as follows. In a cross section perpendicular to the cell extending direction of the honeycomb structure, a straight line passing through the center O of the honeycomb structure and the position of “TC-01” is drawn, and this is defined as a “center passing straight line” (in FIG. 7, reference numeral (Indicated by “T0”). “C” indicates a case where the groove is formed so that the central axis of the groove is positioned on the “center passing straight line”. “B” indicates a case where the groove is formed so that the central axis of the groove is positioned on the following “first rotation straight line (indicated by reference numeral“ T1 ”in FIG. 7)”. The “first rotation straight line” is a straight line obtained by rotating the “center passage straight line” clockwise by 45 ° around the position of “TC-01”. “A” indicates a case where the groove is formed such that the central axis of the groove is positioned on the following “second rotation straight line (indicated by reference numeral“ T2 ”in FIG. 7)”. The “second rotation straight line” is a straight line obtained by rotating the “center passing straight line” 45 ° clockwise around the center O of the honeycomb structure. FIG. 7 is a plan view schematically showing the temperature measurement position in the temperature measurement test as seen from one end face side of the honeycomb structure.

  “TC-A1” indicates the temperature at which the distance L1 from the outer peripheral surface of the flange portion in the honeycomb structure is 5 mm at the position “A” in “the circumferential position of the groove” (see FIG. 8). “TC-B1” indicates a temperature at a distance of 5 mm from the outer peripheral surface of the flange portion in the honeycomb structure at the position “B” in “the circumferential position of the groove portion”. “TC-C1” indicates a temperature at which the distance from the outer peripheral surface of the flange portion in the honeycomb structure is 5 mm at the position “C” of “the circumferential position of the groove”. “TC-A2” indicates the temperature at which the distance L2 from the outer peripheral surface of the flange portion in the honeycomb structure is 1 mm at the position “A” of “the circumferential position of the groove” (see FIG. 8). FIG. 8 is an enlarged view schematically showing a part of FIG. 6B in an enlarged manner.

  In Table 1, “TC-01 (inlet side)” in the column of “maximum error between estimated source temperature and measured temperature (° C.)” is the position of “TC-01” shown in FIGS. 6A and 6B. Indicates that the temperature was measured.

(Examples 2 to 4, Comparative Example 1)
First, an exhaust gas purification apparatus that satisfies the conditions shown in Table 1 was produced in the same manner as in Example 1. Next, a “temperature measurement test” was performed in the same manner as in Example 1. The results are shown in Table 1.

(Example 5)
First, a honeycomb structure satisfying the conditions shown in Table 2 was produced in the same manner as in Example 1. Next, the “easiness of inserting a thermocouple” was evaluated for the manufactured honeycomb structure.

[Easy insertion of thermocouple]
A K thermocouple (diameter 0.5 mm) was inserted into the groove of the honeycomb structure five times. Thereafter, the ease of thermocouple insertion (thermocouple insertion ease) was evaluated according to the following evaluation criteria. The case where “can be inserted relatively easily” is indicated by “◯”, and the case where “can be inserted but takes time for alignment” is indicated by “Δ”.

(Examples 6 to 8)
First, a honeycomb structure satisfying the conditions shown in Table 2 was produced in the same manner as in Example 5. Next, the evaluation of “thermocouple insertion ease” was performed in the same manner as in Example 5. The results are shown in Table 2.

  As is clear from Examples 1 to 8 and Comparative Example 1, the honeycomb structure of the present invention can measure the internal temperature with high accuracy and can easily replace a temperature measurement probe such as a thermocouple. It was confirmed that there was.

  The honeycomb structure of the present invention can be used as a filter for purifying exhaust gas discharged from an automobile or the like. The exhaust gas purifying apparatus of the present invention can be used as a filter for purifying exhaust gas discharged from an automobile or the like.

1: partition wall, 2: cell, 10: honeycomb substrate, 11: inflow end surface, 12: outflow end surface, 15: flange portion, 20: groove portion, 21: side surface, 22: honeycomb segment, 23: end surface, 24: bonding layer , 25: plugged portion, 26: outer periphery coating layer, 30: thermocouple, 51: inflow port, 52: outflow port, 53: trunk, 54: convex portion, 55: through hole, 56: expanded tube portion, 57: Narrow tube part, 60: Diesel engine, 62: DOC, 64: Thermocouple, 100: Honeycomb structure, 150: Can body, 200: Exhaust gas purification device, N: Length of groove part, L1, L2: Distance.

Claims (5)

A honeycomb substrate having a porous partition wall that defines a plurality of cells extending from an inflow end surface, which is one end surface into which the fluid flows, to an outflow end surface, which is the other end surface from which the fluid flows out, and serves as a fluid flow path;
A flange portion that surrounds the outer periphery of the honeycomb substrate and is formed to protrude outward from the outer periphery of the honeycomb substrate;
An opening on the outflow end face side of the inlet cell, which is a predetermined cell of the honeycomb base material, and a plugging portion disposed in the opening part of the inflow end face of the outlet cell, which is a remaining cell,
A honeycomb structure in which at least one groove for inserting a temperature measurement probe having an opening on a side surface of the flange is formed in the flange.   The honeycomb structure according to claim 1, wherein a depth of the groove portion formed in the flange portion is a value equal to or less than a height value of the flange portion.   The honeycomb structure according to claim 1 or 2, wherein a length of the opening of the groove portion formed in the flange portion in the circumferential direction of the honeycomb base material is 0.5 to 20 mm.   The honeycomb structure according to any one of claims 1 to 3, wherein a length of the opening portion of the groove portion formed in the flange portion in a cell extending direction of the honeycomb base material is 0.5 mm or more. . A honeycomb structure according to any one of claims 1 to 4,
A can body that has an inflow port through which exhaust gas flows in, an outflow port through which purified exhaust gas flows out, and a body portion located between the inflow port and the outflow port, and stores the honeycomb structure in the body portion And comprising
The trunk portion of the can body has a convex portion that fits into the flange portion of the honeycomb structure, and the opening portion of the groove portion formed in the flange portion of the honeycomb structure is formed in the convex portion. At least one through hole having an opening with an area equal to or larger than the area of
The honeycomb structure is disposed at a position where the groove portion formed in the flange portion and the through hole of the convex portion of the can body communicate with each other.
Further, an exhaust having a temperature measurement probe that measures the temperature inside the honeycomb structure through the through-hole of the convex portion of the can body and inserted into the groove of the flange portion of the honeycomb structure. Purification equipment.

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