Heat exchange member, heat exchanger and heat conductive member

Abstract

To provide a heat exchange member which enables improvement of heat recovery efficiency and inhibits increase of a pressure loss and can inhibit occurrence of cracks in a honeycomb structure.SOLUTION: A heat exchange member 100 includes: a honeycomb structure 10 having an outer peripheral wall 11, and a partition wall 12 disposed at the inner side of the outer peripheral wall 11 and defining multiple cells 15 which form a first fluid passage extending from a first end surface 13 to a second end surface 14; and a cover member 20 which covers an outer peripheral surface of the outer peripheral wall 11. On a cross section of the honeycomb structure 10 which is orthogonal to a direction of the first fluid passage, the partition wall 12 includes: a first partition wall 12a extending in a radial direction; and a second partition wall 12b extending in a circumferential direction. Slits 30 are provided in parts of at least one of the outer peripheral wall 11 and the second partition wall 12b.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a heat exchange member, a heat exchanger, and a heat conduction member. [Background technology]

[0002] In recent years, there has been a demand for improved fuel economy in automobiles. In particular, to prevent a deterioration in fuel economy when the engine is cold, such as when the engine is started, there are hopes for a system that can quickly warm the coolant, engine oil, automatic transmission fluid (ATF), etc., thereby reducing friction loss. There are also hopes for a system that can heat the exhaust gas purification catalyst in order to quickly activate the catalyst.

[0003] An example of such a system is a heat exchanger. A heat exchanger is a device that exchanges heat between a first fluid and a second fluid by circulating a first fluid inside the heat exchanger and a second fluid outside the heat exchanger. In such a heat exchanger, heat is exchanged from a high-temperature fluid (e.g., exhaust gas) to a low-temperature fluid (e.g., cooling water), making it possible to effectively utilize heat.

[0004] For example, Patent Document 1 proposes a heat exchange element comprising a honeycomb structure having partition walls and an outer wall that define cells that penetrate from a first end face to a second end face and serve as a flow path for a first fluid, and a covering member that covers the outer wall of the honeycomb structure, in which, in a cross-section of the columnar honeycomb structure perpendicular to the flow path direction of the first fluid, the partition walls have first partition walls extending in the radial direction and second partition walls extending in the circumferential direction, and the number of first partition walls on the central portion side is smaller than the number of first partition walls on the outer wall side, and a heat exchanger comprising the heat exchange element. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-120488 A Summary of the Invention [Problem to be solved by the invention]

[0006] The heat exchange member described in Patent Document 1 has fewer first partition walls on the central side of the honeycomb structure than on the outer wall side, making it easier to form cells on the central side of the honeycomb structure as well, thereby achieving both improved heat recovery efficiency and suppression of increases in pressure loss. However, the honeycomb structure used in this heat exchanger member has a problem in that thermal stress is concentrated in the second partition walls extending in the circumferential direction and in the outer peripheral wall, compared to the first partition walls extending in the radial direction, and cracks are likely to occur.

[0007] The present invention has been made to solve the above problems, and provides a heat exchanger and a heat exchanger that can improve heat recovery efficiency and suppress an increase in pressure loss while suppressing the occurrence of cracks in the honeycomb structure. The present invention also provides a heat conduction member that can be mounted on the above heat exchanger and heat exchanger. [Means for solving the problem]

[0008] The above problems are solved by the present invention, which is specified as follows:

[0009] The present invention relates to a honeycomb structure having an outer peripheral wall and partition walls disposed inside the outer peripheral wall and defining a plurality of cells that serve as a flow path for a first fluid extending from a first end surface to a second end surface; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, the outer peripheral wall and the second partition wall One The heat exchange member has a slit in a portion.

[0010] The present invention also relates to a hollow honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, partitioning and forming a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, The outer peripheral wall and The inner peripheral wall and at least one part of The second interval Wall part and It is a heat exchange member having a slit provided therein.

[0011] The present invention also relates to a heat exchange member, an outer cylinder arranged radially outwardly of the covering member at a distance therefrom so that a second fluid can flow around the outer periphery of the covering member; It is a heat exchanger comprising:

[0012] The present invention also provides a heat transfer member including a honeycomb structure having an outer peripheral wall and partition walls disposed inside the outer peripheral wall and defining a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, The outer peripheral wall and the partition wall are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles, In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, the outer peripheral wall and the second partition wall One The heat conductive member has a slit in a portion.

[0013] Furthermore, the present invention provides a heat transfer member including a hollow honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, partitioning and forming a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, The outer peripheral wall, the inner peripheral wall and the partition wall are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles, In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, The outer peripheral wall and The inner peripheral wall and at least one part of The second interval Wall part and The heat conductive member has a slit formed therein. Effect of the Invention

[0014] According to the present invention, it is possible to provide a heat exchange member and a heat exchanger that can improve heat recovery efficiency and suppress an increase in pressure loss while suppressing the occurrence of cracks in the honeycomb structure. Also, according to the present invention, it is possible to provide a heat conductive member that can be mounted on the above-mentioned heat exchange member and heat exchanger. [Brief description of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view parallel to the axial direction of a honeycomb structure of a heat exchanger element according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line aa' of the heat exchange member shown in FIG. [Diagram 3] 3 is a partial enlarged view of a honeycomb structure constituting the heat exchange member shown in FIG. 2. [Figure 4] 3 is a partial enlarged view of another honeycomb structure that can be used in the heat exchanger member shown in FIGS. 1 and 2. FIG. [Diagram 5] 3 is a partial enlarged view of another honeycomb structure that can be used in the heat exchanger member shown in FIGS. 1 and 2. FIG. [Figure 6] 3 is a partial enlarged view of another honeycomb structure that can be used in the heat exchanger member shown in FIGS. 1 and 2. FIG. [Figure 7] 1 is a cross-sectional view parallel to a flow path direction of a first fluid in a honeycomb structure of a heat exchanger according to a first embodiment of the present invention. [Figure 8]8 is a cross-sectional view taken along line bb' of the heat exchanger shown in FIG. 7. [Figure 9] FIG. 5 is a cross-sectional view parallel to the axial direction of a hollow honeycomb structure of a heat exchanger element according to a second embodiment of the present invention. [Figure 10] 10 is a cross-sectional view of the heat exchanger member shown in FIG. 9 taken along the line c-c'. [Figure 11] FIG. 2 is a view for explaining the positions of slits in the honeycomb structures produced in Examples 1 to 3. [Figure 12] FIG. 13 is a view for explaining the positions of slits in the hollow honeycomb structures produced in Examples 4 and 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and it should be understood that modifications and improvements to the following embodiments, which are made based on the ordinary knowledge of a person skilled in the art, fall within the scope of the present invention, without departing from the spirit of the present invention.

[0017] <Embodiment 1> (1) Heat exchange and heat conduction components Fig. 1 is a cross-sectional view parallel to the axial direction of the honeycomb structure of the heat exchanger element according to the first embodiment of the present invention. Fig. 2 is a cross-sectional view of the heat exchanger element shown in Fig. 1 taken along line a-a', that is, a cross-sectional view perpendicular to the flow path direction (axial direction) of the first fluid of the honeycomb structure of the heat exchanger element according to the first embodiment of the present invention. Fig. 3 is a partial enlarged view of the honeycomb structure constituting the heat exchanger element shown in Fig. 2.

[0018] The heat exchange member 100 according to the first embodiment of the present invention includes a honeycomb structure 10 having an outer peripheral wall 11, partition walls 12 disposed inside the outer peripheral wall 11 and partitioning a plurality of cells 15 that serve as a flow path for a first fluid extending from a first end face 13 to a second end face 14, and a covering member 20 that covers the outer peripheral surface of the outer peripheral wall 11. In the heat exchange member 100 having such a structure, heat exchange between the first fluid that can flow in the cells 15 and the second fluid that can flow around the outer periphery of the covering member 20 is performed through the outer peripheral wall 11 of the honeycomb structure 10 and the covering member 20. In FIG. 1, the first fluid can flow in either the left or right direction on the paper. The first fluid is not particularly limited, and various liquids or gases can be used. For example, when the heat exchange member 100 is used in a heat exchanger mounted on an automobile, the first fluid is preferably exhaust gas.

[0019] Moreover, among the components of the heat exchange member 100 according to the first embodiment of the present invention, those excluding the covering member 20 are referred to as a heat conductive member. That is, the heat conductive member according to the first embodiment of the present invention includes a honeycomb structure 10 having an outer peripheral wall 11 and partition walls 12 disposed inside the outer peripheral wall 11 and defining a plurality of cells 15 that serve as flow paths for a first fluid extending from a first end face 13 to a second end face 14.

[0020] The partition walls 12 constituting the honeycomb structure 10 have first partition walls 12a extending in the radial direction (diameter direction) and second partition walls 12b extending in the circumferential direction in a cross section of the honeycomb structure 10 perpendicular to the flow path direction of the first fluid (i.e., the cross section shown in FIG. 2). With this structure, the heat of the first fluid can be transferred in the radial direction via the first partition walls 12a, and therefore the heat of the first fluid can be efficiently transferred to the outside of the honeycomb structure 10.

[0021] In the honeycomb structure 10 having the above-described structure, when the entire honeycomb structure 10 thermally expands in the radial direction, thermal stress in the circumferential direction is applied to the second partition walls 12b and the outer peripheral wall 11. Since the thermal stress in the circumferential direction is larger than the thermal stress in the radial direction, the thermal stress is concentrated in the second partition walls 12b and the outer peripheral wall 11, and cracks are likely to occur. Therefore, slits 30 are provided in a part of at least one of the outer peripheral wall 11 and the second partition wall 12b that constitute the honeycomb structure 10. By providing the slits 30 in this manner, thermal stress in at least one of the second partition wall 12b and the outer peripheral wall 11 is alleviated, making it possible to suppress the occurrence of cracks.

[0022] The slits 30 can be provided in a part of the outer peripheral wall 11 or the second partition wall 12b where cracks are likely to occur due to thermal stress concentration as shown in Figures 2 to 5, or in a part of the outer peripheral wall 11 and the second partition wall 12b as shown in Figure 6. Among them, it is preferable to provide the slits 30 in (i) a part of the outer peripheral wall 11 and the second partition wall 12b, or (ii) a part of the second partition wall 12b, and it is more preferable to provide the slits 30 in (i) a part of the outer peripheral wall 11 and the second partition wall 12b from the viewpoint of suppressing cracks in both the outer peripheral wall 11 and the second partition wall 12b. Note that Figures 4 to 6 show partially enlarged views of a honeycomb structure that can be used for the heat exchange member 100 and the heat conduction member, similar to Figure 3.

[0023] The length of the slits 30 in the axial direction of the honeycomb structure 10 (the flow path direction of the first fluid) is not particularly limited, and may be the same as the axial length of the honeycomb structure 10 or may be shorter than the axial length of the honeycomb structure 10. Furthermore, the width of the slit 30 in the cross section of the honeycomb structure 10 perpendicular to the flow direction of the first fluid is not particularly limited, and may be the same as the length between the two first partition walls 12a, or may be smaller than the length between the two first partition walls 12a.

[0024] The number of slits 30 provided in a portion of at least one of the outer peripheral wall 11 and the second partition wall 12b is not particularly limited, but the greater the number, the greater the effect of alleviating thermal stress. However, if the number of slits 30 is too large, there is a risk that the strength of the honeycomb structure 10 will decrease. Therefore, it is desirable to set the number of slits 30 according to the size of the honeycomb structure 10 and the number of partition walls 12.

[0025] The slits 30 are preferably provided in a part of the second partition wall 12b and are continuous in the radial direction. Such slits 30 can be easily formed by a general processing method, thereby improving the productivity of the heat exchange member 100 and the heat conduction member. Here, "slits 30 continuous in the radial direction" means that, as shown in Figure 3, in a cross section of the honeycomb structure 10 perpendicular to the flow path direction of the first fluid, multiple continuous slits 30 are located on a line L1 extending in the radial direction.

[0026] The slits 30 continuing in the radial direction may also continue into the outer peripheral wall 11 as shown in Fig. 6. Even in such a configuration, the slits can be easily formed by a general processing method, and therefore the productivity of the heat exchange member 100 and the heat conduction member is improved.

[0027] When the number of the second partition walls 12b in the radial direction is n, the slits 30 continuous in the radial direction are preferably provided in n×0.3 or more (rounded down to whole numbers) of the second partition walls 12b from the outer peripheral wall 11 side, and more preferably in n×0.4 or more (rounded down to whole numbers). This configuration can stably suppress cracks in the second partition walls 12b. In addition, the more the number of the second partition walls 12b in which the slits 30 continuous in the radial direction are provided, the more the pressure loss can be reduced. Reducing the pressure loss reduces the flow rate of the first fluid flowing through the cells 15, and the time during which the partition walls 12 and the first fluid are in contact with each other increases, thereby improving the heat recovery performance. The upper limit of the number of the second partition walls 12b having the slits 30 continuous in the radial direction is not particularly limited, and may be n or less (i.e., all the second partition walls 12b may have the slits 30 continuous in the radial direction), and is preferably n×0.7 or less (rounded down to nearest whole number). The number of the second partition walls 12b in the radial direction depends on the outer diameter of the honeycomb structure 10, but is preferably 5 to 30, and more preferably 10 to 20. For example, in the honeycomb structure 10 shown in Figures 1 to 4, since the number of second partition walls 12b in the radial direction is nine (n = 9), it is preferable that two or more second partition walls 12b from the peripheral wall 11 side have slits 30 that are continuous in the radial direction. Note that Figures 2 and 3 show an example in which four second partition walls 12b from the peripheral wall 11 side have slits 30 that are continuous in the radial direction. Also, Figure 6 shows an example in which the peripheral wall 11 and four second partition walls 12b from the peripheral wall 11 side have slits 30 that are continuous in the radial direction.

[0028] The number of slits 30 in the circumferential direction is not particularly limited, but is preferably 3 to 10, and more preferably 4 to 8. By controlling the number to such a value, it is possible to enhance the effect of suppressing cracks while ensuring the strength of the honeycomb structure 10. Furthermore, the greater the number of slits 30 in the circumferential direction, the more the pressure loss can be reduced. Reducing the pressure loss reduces the flow rate of the first fluid flowing through the cells 15, and the time during which the partition walls 12 and the first fluid are in contact with each other increases, thereby improving the heat recovery performance. Here, "the number of slits 30 in the circumferential direction" refers to the number of slits 30 in the circumferential direction when the second partition wall 12b in the region located between two first partition walls 12a is counted as one slit. For example, Fig. 2 shows an example in which the number of slits 30 in the circumferential direction is four.

[0029] The external shape of the honeycomb structure 10 is not particularly limited as long as the first fluid can flow through the cells 15 from the first end face 13 to the second end face 14. Examples of the external shape of the honeycomb structure 10 include a circular cylinder, an elliptical cylinder, a rectangular cylinder, or other polygonal cylinders. Therefore, in a cross section perpendicular to the flow direction of the first fluid, the external shape of the honeycomb structure 10 can be a circle, an ellipse, a rectangle, or other polygonal shape. Note that Figures 1 and 2 show an example in which the external shape of the honeycomb structure 10 is cylindrical and the cross-sectional shape is circular.

[0030] The number of first partition walls 12a on the central portion side of the honeycomb structure 10 is preferably smaller than the number of first partition walls 12a on the peripheral wall 11 side of the honeycomb structure 10. With this configuration, the cells 15 can be easily formed also on the central portion side of the honeycomb structure 10. Therefore, it is possible to suppress an increase in pressure loss in the heat exchange member 100 and the heat conduction member caused by the cells 15 being difficult to form on the central portion side of the honeycomb structure 10. Here, the number of first partition walls 12a on the central portion side of the honeycomb structure 10 means the total number of first partition walls 12a forming the plurality of cells 15 in a region (hereinafter referred to as the "circumferential region") having the plurality of cells 15 aligned in the circumferential direction, which is closest to the central portion of the honeycomb structure 10 (i.e., farthest from the peripheral wall 11) in the cross section shown in Fig. 2. In addition, the number of first partition walls 12a on the peripheral wall 11 side of the honeycomb structure 10 means the total number of first partition walls 12a forming the plurality of cells 15 in the circumferential region farthest from the central portion of the honeycomb structure 10 (i.e., closest to the peripheral wall 11) in the cross section shown in Fig. 2.

[0031] From the viewpoint of heat recovery efficiency, the number of first partition walls 12a on the outer peripheral wall 11 side of the honeycomb structure 10 is preferably 100 to 500, and more preferably 200 to 300. Furthermore, from the viewpoint of thermal stress relaxation and ensuring strength, the number of second partition walls 12b of the honeycomb structure 10 is preferably 500 to 4000, and more preferably 1000 to 3000.

[0032] The thickness of the first partition wall 12a is preferably greater than the thickness of the second partition wall 12b. Since the thickness of the partition wall 12 correlates with the amount of heat transfer, such a configuration can make the amount of heat transfer of the first partition wall 12a greater than the amount of heat transfer of the second partition wall 12b. As a result, the heat of the first fluid flowing through the cells 15 on the central side of the honeycomb structure 10 can be efficiently transferred to the outside of the honeycomb structure 10. The thickness of the partition walls 12 (first partition walls 12a and second partition walls 12b) is not particularly limited and may be appropriately adjusted depending on the application. The thickness of the partition walls 12 is preferably 0.1 to 1 mm, and more preferably 0.2 to 0.6 mm. By making the thickness of the partition walls 12 0.1 mm or more, the mechanical strength of the honeycomb structure 10 can be made sufficient. Furthermore, by making the thickness of the partition walls 12 1 mm or less, it is possible to prevent an increase in pressure loss due to a decrease in the opening area and a decrease in heat recovery efficiency due to a decrease in the contact area with the first fluid.

[0033] In the heat exchange member 100 and the heat conduction member, the outer peripheral wall 11 of the honeycomb structure 10 is exposed to external impacts, thermal stress due to the temperature difference between the first fluid and the second fluid, and the like. Therefore, from the viewpoint of ensuring resistance to these external forces, it is preferable that the thickness of the outer peripheral wall 11 is made larger than the thickness of the partition walls 12 (the first partition walls 12a and the second partition walls 12b). With this configuration, damage (e.g., cracks, breakage, etc.) of the outer peripheral wall 11 due to external forces can be suppressed. The thickness of the outer peripheral wall 11 is not particularly limited and may be adjusted appropriately depending on the application. For example, when the heat exchange member 100 and the heat conductive member are used for general heat exchange, the thickness of the outer peripheral wall 11 is preferably more than 0.3 mm and not more than 10 mm, more preferably 0.5 to 5 mm, and even more preferably 1 to 3 mm. When the heat exchange member 100 and the heat conductive member are used for heat storage, the thickness of the outer peripheral wall 11 is preferably 10 mm or more to increase the heat capacity of the outer peripheral wall 11.

[0034] The partition walls 12 and the outer peripheral wall 11 of the honeycomb structure 10 are mainly composed of ceramics. "Mainly composed of ceramics" means that the mass ratio of ceramics to the total mass of the partition walls 12 and the outer peripheral wall 11 is 50 mass % or more.

[0035] The porosity of the partition walls 12 and the outer peripheral wall 11 is preferably 10% or less, more preferably 5% or less, and further preferably 3% or less. The porosity of the partition walls 12 and the outer peripheral wall 11 can also be 0%. By setting the porosity of the partition walls 12 and the outer peripheral wall 11 to 10% or less, the thermal conductivity can be improved.

[0036] The partition walls 12 and the outer peripheral wall 11 preferably contain, as a main component, SiC (silicon carbide) having high thermal conductivity. "Containing SiC (silicon carbide) as a main component" means that the mass ratio of SiC (silicon carbide) to the total mass of the partition walls 12 and the outer peripheral wall 11 is 50 mass% or more.

[0037] More specifically, materials such as Si-impregnated SiC, (Si+Al)-impregnated SiC, metal composite SiC, recrystallized SiC, Si3N4, and SiC can be used as the material of the partition wall 12 and the outer peripheral wall 11. Among them, a Si-SiC material (sintered body) mainly made of SiC particles as an aggregate and containing metal Si between the SiC particles is preferred because it can be manufactured at low cost and has high thermal conductivity. Specifically, it is preferred to use Si-impregnated SiC or (Si+Al)-impregnated SiC as a material. In this specification, "mainly made of SiC as an aggregate" means that the ratio of SiC particles to the total mass of the aggregate is 50 mass% or more, preferably 70 mass% or more, more preferably 80 mass% or more, and particularly preferably 95 mass% or more.

[0038] The cell density (i.e., the number of cells 15 per unit area) in a cross section perpendicular to the flow direction of the first fluid is not particularly limited and may be appropriately adjusted depending on the application, etc., but is preferably 4 to 320 cells / cm. 2 The cell density is preferably in the range of 4 cells / cm. 2 By setting the cell density at or above 320 cells / cm, the strength of the partition walls 12, and in turn the strength and effective GSA (geometric surface area) of the honeycomb structure 10 itself can be sufficiently ensured. 2 By setting the above value, it is possible to prevent an increase in pressure loss when the first fluid flows.

[0039] The isostatic strength of the honeycomb structure 10 is preferably more than 5 MPa, more preferably 10 MPa or more, and even more preferably 100 MPa or more. When the isostatic strength of the honeycomb structure 10 exceeds 5 MPa, the honeycomb structure 10 can have excellent durability. The isostatic strength of the honeycomb structure 10 can be measured in accordance with the method for measuring isostatic strength stipulated in JASO standard M505-87, which is an automotive standard issued by the Society of Automotive Engineers of Japan.

[0040] The diameter of the honeycomb structure 10 in a cross section perpendicular to the flow direction of the first fluid is preferably 20 to 200 mm, more preferably 30 to 100 mm. By setting the diameter in this range, it is possible to improve the heat recovery efficiency. When the shape of the honeycomb structure 10 in the cross section is not circular, the diameter of the maximum inscribed circle inscribed in the cross-sectional shape of the honeycomb structure 10 is defined as the diameter of the honeycomb structure 10 in the cross section.

[0041] The length of the honeycomb structure 10 (length in the flow path direction of the first fluid) is not particularly limited and may be appropriately adjusted depending on the application, etc. For example, the length of the honeycomb structure 10 is preferably 3 to 200 mm, more preferably 5 to 100 mm, and further preferably 10 to 50 mm.

[0042] The thermal conductivity of the honeycomb structure 10 at 25° C. is preferably 50 W / (m·K) or more, more preferably 100 to 300 W / (m·K), and even more preferably 120 to 300 W / (m·K). By setting the thermal conductivity of the honeycomb structure 10 within this range, the thermal conductivity is improved, and the heat within the honeycomb structure 10 can be efficiently transferred to the outside. The thermal conductivity value is a value measured by a laser flash method (JIS R1611-1997).

[0043] When exhaust gas is made to flow as the first fluid through the cells 15 of the honeycomb structure 10, a catalyst may be supported on the partition walls 12 of the honeycomb structure 10. By supporting a catalyst on the partition walls 12, it becomes possible to convert CO, NOx, HC, and the like in the exhaust gas into harmless substances by catalytic reaction, and it becomes possible to use the reaction heat generated during the catalytic reaction for heat exchange. The catalyst preferably contains at least one element selected from the group consisting of precious metals (platinum, rhodium, palladium, ruthenium, indium, silver, and gold), aluminum, nickel, zirconium, titanium, cerium, cobalt, manganese, zinc, copper, tin, iron, niobium, magnesium, lanthanum, samarium, bismuth, and barium. The above elements may be contained as simple metals, metal oxides, or other metal compounds.

[0044] The covering member 20 is not particularly limited as long as it can cover the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10. For example, a tubular member that fits onto the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 and covers the outer peripheral wall 11 of the honeycomb structure 10 can be used. In addition, from the viewpoint of a cushioning effect, an inorganic mat or the like may be interposed between the honeycomb structure 10 and the covering member 20. In this specification, the term "fitting" refers to the honeycomb structure 10 and the covering member 20 being fixed in a mutually fitted state. Therefore, the fitting of the honeycomb structure 10 and the covering member 20 includes fixing methods using fitting such as clearance fitting, interference fitting, and shrink fitting, as well as methods in which the honeycomb structure 10 and the covering member 20 are fixed to each other by brazing, welding, diffusion bonding, and the like.

[0045] The covering member 20 can have an inner surface shape corresponding to the outer peripheral wall 11 of the honeycomb structure 10. When the inner surface of the covering member 20 is in direct contact with the outer peripheral wall 11 of the honeycomb structure 10, the thermal conductivity is improved and the heat in the honeycomb structure 10 can be efficiently transferred to the covering member 20.

[0046] From the viewpoint of improving the heat recovery efficiency, it is preferable that the ratio of the area of ​​the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 that is circumferentially covered by the covering member 20 to the total area of ​​the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 is high. Specifically, the area ratio is preferably 80% or more, more preferably 90% or more, and even more preferably 100% (i.e., the entire outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 is circumferentially covered by the covering member 20). Note that the "peripheral wall 11" referred to here refers to a surface of the honeycomb structure 10 that is parallel to the flow direction of the first fluid, and does not include surfaces of the honeycomb structure 10 that are perpendicular to the flow direction of the first fluid (first end face 13 and second end face 14).

[0047] From the viewpoint of manufacturability, the covering member 20 is preferably made of metal. In addition, if the covering member 20 is made of metal, it is also advantageous in that welding to the outer cylinder 40 (casing) described below can be easily performed. For example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, etc. can be used as the material of the covering member 20. Among them, stainless steel is preferable because it has high durability and reliability and is inexpensive.

[0048] The thickness of the covering member 20 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and even more preferably 0.5 mm or more, for reasons of durability and reliability. The thickness of the covering member 20 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less, for reasons of reducing thermal resistance and increasing thermal conductivity.

[0049] The length of the covering member 20 (the length in the flow path direction of the first fluid) is not particularly limited and may be appropriately adjusted depending on the size of the honeycomb structure 10. For example, the length of the covering member 20 is preferably greater than the length of the honeycomb structure 10. Specifically, the length of the covering member 20 is preferably 5 mm to 250 mm, more preferably 10 mm to 150 mm, and further preferably 20 mm to 100 mm. When the length of the covering member 20 is greater than the length of the honeycomb structure 10 , it is preferable that the covering member 20 is provided so that the honeycomb structure 10 is located at the center thereof.

[0050] Next, a method for manufacturing the heat exchanger 100 and the heat conductive member will be described, however, the method for manufacturing the heat exchanger 100 and the heat conductive member is not limited to the manufacturing method described below. First, a clay containing ceramic powder is extruded into a desired shape to produce a honeycomb molded body. At this time, by selecting a die and a jig of an appropriate shape, the shape and density of the cells 15, the number, length and thickness of the partition walls 12, the shape and thickness of the outer peripheral wall 11, etc. can be controlled. In addition, the above-mentioned ceramics can be used as the material of the honeycomb molded body. For example, when manufacturing a honeycomb molded body mainly composed of a Si-impregnated SiC composite material, a binder and water or an organic solvent are added to a predetermined amount of SiC powder, the resulting mixture is kneaded to form a clay, and the resulting mixture is molded to obtain a honeycomb molded body of a desired shape. Then, the obtained honeycomb molded body is dried, and the honeycomb molded body is impregnated with metal Si and fired in a reduced pressure inert gas or vacuum, thereby obtaining a honeycomb structure 10 (thermal conductive member). The slits 30 may be formed during extrusion molding, may be formed on the honeycomb structure 10 after firing, or may be formed on the dried honeycomb molded body before firing. When the slits 30 are formed during extrusion molding, the die may be processed so that the slits 30 are formed in a part of at least one of the outer peripheral wall 11 and the second partition wall 12b. When the slits 30 are formed in the honeycomb structure 10 after firing or in the dried honeycomb molded body before firing, a processing method known in the art may be used. The processing method is not particularly limited, but may be grinding, cutting, laser processing, water jet processing, electric discharge (EDM) processing, or the like.

[0051] Next, the honeycomb structure 10 is shrink-fitted into the covering member 20, so that the inner peripheral surface of the covering member 20 is fitted into the outer peripheral surface of the outer wall 11 of the honeycomb structure 10. Specifically, the covering member 20 is heated and expanded, the honeycomb structure 10 is inserted into the covering member 20, and then the covering member 20 is cooled and contracted, so that the honeycomb structure 10 can be fixed in the covering member 20. As described above, the honeycomb structure 10 and the covering member 20 can be fitted together by a fixing method using fitting such as a clearance fit or an interference fit, as well as shrink fitting, brazing, welding, diffusion bonding, or the like, in addition to shrink fitting. In this manner, the heat exchange member 100 can be obtained.

[0052] The heat exchange member 100 and heat conduction member of embodiment 1 of the present invention relieve thermal stress in at least one of the second partition wall 12b and the outer wall 11 by providing a slit 30 in a portion of at least one of the outer wall 11 and the second partition wall 12b that constitute the honeycomb structure 10, thereby achieving both improved heat recovery efficiency and suppression of increases in pressure loss while also suppressing the occurrence of cracks in the honeycomb structure 10.

[0053] (2) Heat exchanger The heat exchanger 200 according to the first embodiment of the present invention has the above-mentioned heat exchange member 100. The members other than the heat exchange member 100 are not particularly limited, and known members can be used. For example, the heat exchanger 200 according to the first embodiment of the present invention can include the heat exchange member 100 and an outer cylinder 40 (casing) arranged at a distance from the outer periphery of the covering member 20 of the heat exchange member 100 so that the second fluid can flow around the outer periphery of the covering member 20.

[0054] Fig. 7 is a cross-sectional view parallel to the flow path direction of the first fluid in the honeycomb structure of the heat exchanger according to the first embodiment of the present invention. Fig. 8 is a cross-sectional view of the heat exchanger shown in Fig. 7 taken along the line b-b', and is a cross-sectional view perpendicular to the flow path direction of the first fluid in the honeycomb structure of the heat exchanger 200 according to the first embodiment of the present invention.

[0055] A heat exchanger 200 according to the first embodiment of the present invention includes a heat exchange member 100 and an outer cylinder 40 arranged at a distance from the outer periphery of the covering member 20 of the heat exchange member 100 so that a second fluid can flow around the outer periphery of the covering member 20. The outer cylinder 40 has a supply pipe 41 and a discharge pipe 42 for the second fluid. In addition, it is preferable that the outer cylinder 40 covers the entire outer periphery of the heat exchange member 100. In the heat exchanger 200 having the above-mentioned structure, the second fluid flows into the outer casing 40 from the supply pipe 41. Next, while passing through the flow path of the second fluid, the second fluid exchanges heat with the first fluid flowing through the cells 15 of the honeycomb structure 10 via the covering member 20 of the heat exchange member 100, and is then discharged from the discharge pipe 42 of the second fluid. The outer peripheral surface of the covering member 20 of the heat exchange member 100 may be covered with a member for adjusting the heat transfer efficiency.

[0056] The second fluid is not particularly limited, but when the heat exchanger 200 is mounted on an automobile, the second fluid is preferably water or antifreeze (LLC as defined in JIS K2234:2006). Regarding the temperatures of the first and second fluids, it is preferable that the temperature of the first fluid is greater than the temperature of the second fluid. This is because the covering member 20 of the heat exchange element 100 does not expand at low temperatures, and the honeycomb structure 10 expands at higher temperatures, making it difficult for the fitting between the two to become loose. In particular, when the fitting between the honeycomb structure 10 and the covering member 20 is performed by shrink fitting, the risk of the fitting becoming loose and the honeycomb structure 10 falling off can be minimized.

[0057] The inner surface of the outer tube 40 is preferably fitted with the outer peripheral surface of the covering member 20 of the heat exchange member 100. In this way, the outer peripheral surface of the covering member 20 at both ends in the flow path direction of the first fluid is in close contact with the inner surface of the outer tube 40 in a circumferential manner, and the second fluid can be prevented from leaking to the outside. Methods for bringing the outer peripheral surface of the covering member 20 into close contact with the inner surface of the outer tube 40 include, but are not limited to, welding, diffusion bonding, brazing, mechanical fastening, and the like. Among these, welding is preferred because it has high durability and reliability and can also improve structural strength.

[0058] From the viewpoints of thermal conductivity and manufacturability, the outer cylinder 40 is preferably made of a metal. Examples of metals that can be used include stainless steel, titanium alloys, copper alloys, aluminum alloys, brass, etc. Among these, stainless steel is preferred because it is inexpensive and has high durability and reliability.

[0059] From the viewpoints of durability and reliability, the thickness of the outer cylinder 40 is preferably 0.1 mm or more, more preferably 0.5 mm or more, and even more preferably 1 mm or more. From the viewpoints of cost, volume, weight, etc., the thickness of the outer cylinder 40 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less.

[0060] The outer cylinder 40 may be an integrally molded product, or may be a joined member formed of two or more members. When the outer cylinder 40 is a joined member formed of two or more members, the design freedom of the outer cylinder 40 can be increased.

[0061] The positions of the supply pipe 41 and the discharge pipe 42 for the second fluid are not particularly limited, and can be appropriately changed in the axial and circumferential directions in consideration of the installation location of the heat exchanger 200, the piping position, the heat exchange efficiency, etc. For example, the supply pipe 41 and the discharge pipe 42 for the second fluid can be provided at positions corresponding to both axial ends of the honeycomb structure 10. Moreover, the supply pipe 41 and the discharge pipe 42 for the second fluid may extend in the same direction or in different directions.

[0062] Next, a description will be given of a manufacturing method of the heat exchanger 200. However, the manufacturing method of the heat exchanger 200 is not limited to the manufacturing method described below. The heat exchanger 200 can be manufactured by disposing and joining the outer tube 40 at a distance from the radial outside of the covering member 20 of the heat exchange member 100 so that the second fluid can flow around the outer periphery of the covering member 20. Specifically, both ends of the covering member 20 of the heat exchange member 100 are joined to the inner surface of the outer tube 40. As described above, there are various joining methods including fitting. If necessary, the joining points can be joined by welding or the like. As a result, the outer tube 40 that circumferentially covers the outer periphery of the covering member 20 is formed, and a flow path for the second fluid is formed between the outer periphery of the covering member 20 and the inner surface of the outer tube 40. In this manner, the heat exchanger 200 can be obtained.

[0063] The heat exchanger 200 according to the first embodiment of the present invention includes the above-mentioned heat exchange member 100, and therefore can improve heat recovery efficiency while suppressing an increase in pressure loss, while also suppressing the occurrence of cracks in the honeycomb structure 10.

[0064] <Embodiment 2> The heat exchanger, heat exchanger and heat conduction member according to the second embodiment of the present invention differ from the heat exchanger and heat exchanger according to the first embodiment of the present invention in that the honeycomb structure is a hollow honeycomb structure, but the other components are the same as those of the heat exchanger, heat exchanger and heat conduction member according to the first embodiment of the present invention. Therefore, in the following, the description of the same parts will be omitted, and only the differences will be described in detail. In addition, the components having the same reference numerals as those appearing in the first embodiment of the present invention are the same as those in the second embodiment of the present invention.

[0065] Fig. 9 is a cross-sectional view parallel to the axial direction of the hollow honeycomb structure of the heat exchanger element according to the second embodiment of the present invention. Fig. 10 is a cross-sectional view of the heat exchanger element shown in Fig. 9 taken along the line c-c', that is, a cross-sectional view perpendicular to the flow path direction (axial direction) of the first fluid of the hollow honeycomb structure of the heat exchanger element according to the second embodiment of the present invention.

[0066] The heat exchange member 300 according to the second embodiment of the present invention includes a hollow honeycomb structure 10a having an outer peripheral wall 11, an inner peripheral wall 16, and partition walls 12 disposed between the outer peripheral wall 11 and the inner peripheral wall 16, which partition walls 12 define a plurality of cells 15 that serve as a flow path for a first fluid extending from a first end face 13 to a second end face 14, and a covering member 20 that covers the outer peripheral surface of the outer peripheral wall 11. In the heat exchange member 300 having such a structure, heat exchange between the first fluid that can flow in the cells 15 and the second fluid that can flow around the outer periphery of the covering member 20 is performed through the outer peripheral wall 11 and the covering member 20 of the hollow honeycomb structure 10a. In FIG. 9, the first fluid can flow in either the left or right direction of the paper.

[0067] Moreover, among the components of the heat exchange member 300 according to the second embodiment of the present invention, those excluding the covering member 20 are referred to as a heat conducting member. That is, the heat conducting member according to the second embodiment of the present invention includes a hollow honeycomb structure 10a having an outer peripheral wall 11, an inner peripheral wall 16, and partition walls 12 disposed between the outer peripheral wall 11 and the inner peripheral wall 16 and defining a plurality of cells 15 that serve as flow paths for a first fluid extending from a first end face 13 to a second end face 14.

[0068] The partition walls 12 constituting the hollow honeycomb structure 10a have first partition walls 12a extending in the radial direction (diameter direction) and second partition walls 12b extending in the circumferential direction in a cross section of the hollow honeycomb structure 10a perpendicular to the flow direction of the first fluid (i.e., the cross section shown in FIG. 10). With this structure, the heat of the first fluid can be transferred in the radial direction via the first partition walls 12a, and therefore the heat of the first fluid can be efficiently transferred to the outside of the hollow honeycomb structure 10a.

[0069] In the hollow honeycomb structure 10a having the above-mentioned structure, when the hollow honeycomb structure 10a as a whole thermally expands in the radial direction, thermal stress in the circumferential direction is applied to the second partition walls 12b, the outer peripheral wall 11, and the inner peripheral wall 16. Since the thermal stress in the circumferential direction is larger than the thermal stress in the radial direction, the thermal stress is concentrated in the second partition walls 12b, the outer peripheral wall 11, and the inner peripheral wall 16, and cracks are likely to occur. Therefore, slits 30 are provided in a part of at least one of the outer peripheral wall 11, the inner peripheral wall 16, and the second partition wall 12b that constitute the honeycomb structure 10a. By providing the slits 30 in this manner, thermal stress in at least one of the outer peripheral wall 11, the inner peripheral wall 16, and the second partition wall 12b is relieved, making it possible to suppress the occurrence of cracks.

[0070] The slits 30 may be provided in a part of the second partition wall 12b, a part of the outer circumferential wall 11, a part of the inner circumferential wall 16, or a part of two of them, or a part of all of them, where cracks are likely to occur due to concentration of thermal stress. Among them, it is preferable to provide the slits 30 in (i) the outer circumferential wall 11, the inner circumferential wall 16, and a part of the second partition wall 12b, (ii) the outer circumferential wall 11 and a part of the second partition wall 12b, (iii) the inner circumferential wall 16 and a part of the second partition wall 12b, (iv) a part of the second partition wall 12b, or (v) a part of the inner circumferential wall 16, and from the viewpoint of ensuring strength while suppressing all cracks in the outer circumferential wall 11 and the second partition wall 12b, it is more preferable to provide the slits 30 in (ii) the outer circumferential wall 11 and a part of the second partition wall 12b.

[0071] The slits 30 are preferably provided in a part of the second partition wall 12b and are continuous in the radial direction. Such slits 30 can be easily formed by a general processing method, thereby improving the productivity of the heat exchange member 300 and the heat conduction member. Moreover, the slits 30 continuing in the radial direction may also be continuing in at least one of the outer peripheral wall 11 and the inner peripheral wall 16. Even in such a configuration, it can be easily formed by a general processing method, and therefore the productivity of the heat exchange member 300 and the heat conduction member is improved.

[0072] From the viewpoint of heat recovery efficiency, the number of the first partition walls 12a of the hollow honeycomb structure 10a is preferably 100 to 500, and more preferably 200 to 400. Moreover, from the viewpoint of thermal stress relaxation and ensuring strength, the number of the second partition walls 12b of the hollow honeycomb structure 10a is preferably 100 to 3000, and more preferably 300 to 2000.

[0073] The thickness and material of the inner peripheral wall 16 may be the same as those of the outer peripheral wall 11 . The diameter of the inner circumferential wall 16 in a cross section perpendicular to the flow path direction of the first fluid is preferably 1 to 70 mm, and more preferably 30 to 70 mm. When the cross-sectional shape of the inner circumferential wall 16 is not circular, the diameter of the maximum inscribed circle inscribed in the cross-sectional shape of the inner circumferential wall 16 is defined as the diameter of the inner circumferential wall 16. The shape of the hollow portion formed inside the inner peripheral wall 16 is not particularly limited, and may be, for example, a circular cylinder, an elliptical cylinder, a square prism, or other polygonal prism in a cross section perpendicular to the flow direction of the first fluid. Therefore, the shape of the hollow portion in a cross section perpendicular to the flow direction of the first fluid (i.e., the inner shape of the inner peripheral wall 16) may be a circle, an ellipse, a square, or other polygonal shape. The outer peripheral shape of the hollow honeycomb structure 10a and the shape of the hollow portion (inner peripheral wall 16) may be the same or different, but are preferably the same from the viewpoint of resistance to external impacts, thermal stress, and the like.

[0074] The manufacturing method of the heat exchange member 300 including the hollow honeycomb structure 10a and the heat conductive member is not particularly limited, and can be performed in the same manner as the manufacturing method of the heat exchange member 100 and the heat conductive member described above. Moreover, the method of forming the slits 30 in the inner peripheral wall 16 can be performed in the same manner as the method of forming the slits 30 in the outer peripheral wall 11 and the second partition wall 12b.

[0075] The heat exchange member 300 and heat conduction member of embodiment 2 of the present invention relieve thermal stress in at least one of the outer peripheral wall 11, the inner peripheral wall 16 and the second partition wall 12b by providing a slit 30 in a portion of at least one of the outer peripheral wall 11, the inner peripheral wall 16 and the second partition wall 12b that constitute the hollow honeycomb structure 10a, thereby achieving both improved heat recovery efficiency and suppression of increases in pressure loss while also suppressing the occurrence of cracks in the hollow honeycomb structure 10a.

[0076] The heat exchanger according to the second embodiment of the present invention has the above-mentioned heat exchange member 300. For example, the heat exchanger according to the second embodiment of the present invention can include the heat exchange member 300 and an outer cylinder (casing) disposed radially outwardly of the covering member 20 at a distance such that the second fluid can flow around the outer periphery of the covering member 20 of the heat exchange member 300. Moreover, the method for manufacturing the heat exchanger according to the second embodiment of the present invention is not particularly limited, and can be performed in the same manner as the method for manufacturing the heat exchanger 200 described above.

[0077] Since the heat exchanger according to the second embodiment of the present invention is equipped with the above-mentioned heat exchange member 300, it is possible to improve the heat recovery efficiency and suppress an increase in pressure loss while also suppressing the occurrence of cracks in the hollow honeycomb structure 10a. EXAMPLES

[0078] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0079] (Examples 1 to 3) A clay containing SiC powder was extruded into a desired shape, then dried, processed to the specified external dimensions, impregnated with metallic Si, and fired to produce a honeycomb structure composed of a Si-SiC material containing metallic Si between the SiC particles (Si-impregnated SiC). The characteristics of the honeycomb structure produced are as follows: Diameter at the cross section perpendicular to the flow direction (axial direction) of the first fluid: 75 mm Axial length: 42mm Number of first partitions on the outer wall side: 200 Number of secondary partitions: 1500 Thickness of first partition: 0.3mm Second partition thickness: 0.3mm Number of secondary partitions in the radial direction: 15 Outer wall thickness: 1mm Porosity of the first partition wall, the second partition wall and the outer peripheral wall: 3% Isostatic strength: 200MPa Thermal conductivity (25℃): 60W / (m K) Next, continuous slits in the radial direction were formed in the manufactured honeycomb structure by cutting at the predetermined positions shown in Fig. 11. It should be noted that Fig. 11 is a cross-sectional view perpendicular to the axial direction of the honeycomb structure, and detailed structure other than the slits is omitted. In Fig. 11, the straight lines within the circles represent the slits. The length of the slits in the axial direction of the honeycomb structure was the same as the axial length of the honeycomb structure. The slits continuous in the radial direction were provided in the outer peripheral wall and X number of second partition walls from the outer peripheral wall, and the number of slits in the circumferential direction was Y. The values ​​of X and Y are shown in Table 1.

[0080] Comparative Example 1 Honeycomb structures were produced under the same conditions as in Examples 1 to 3. In Comparative Example 1, no slits were formed in the honeycomb structure.

[0081] Next, the honeycomb structures obtained in the above examples and comparative examples were shrink-fitted onto a covering member to produce a heat exchanger element. A stainless steel tubular member (thickness 1 mm) was used as the covering member. Next, a test jig was produced using the heat exchanger element, similar to the heat exchanger structure shown in Figs. 7 and 8, in which a second fluid flows around the outer periphery of the heat exchanger element.

[0082] A heat resistance test was conducted on the test jig prepared as described above by passing a first fluid through the cells of the honeycomb structure and a second fluid through the outer periphery of the covering member, and the temperature of the gas (first fluid) that caused cracks in the honeycomb structure was evaluated. In the heat resistance test, a gas (first fluid) whose temperature was increased by 100°C from 500°C to a maximum temperature of 1000°C was passed through the cells of the honeycomb structure at a flow rate of 100g / s, and water (second fluid) at 40°C was passed through the outer periphery of the covering member at a flow rate of 10L / min. The honeycomb structure was observed under a microscope to evaluate whether cracks occurred. The evaluation results are shown in Table 1.

[0083] [Table 1]

[0084] As shown in Table 1, in a heat exchanger using a honeycomb structure without slits, cracks occurred in the honeycomb structure when the temperature of the gas (first fluid) was 700°C (Comparative Example 1), whereas in a heat exchanger using a honeycomb structure with slits, either the temperature of the gas at which cracks occurred in the honeycomb structure was high (Examples 1 and 2), or no cracks occurred in the honeycomb structure (Example 3). Therefore, it is considered that by providing slits in the honeycomb structure, cracks become less likely to occur in the honeycomb structure. Furthermore, as can be seen from Examples 1 to 3, by increasing the number of circumferential slits and the depth of the radial slits in a well-balanced manner, a honeycomb structure in which cracks do not occur can be obtained.

[0085] (Examples 4 and 5) A clay containing SiC powder was extruded into a desired shape, then dried, processed to the specified external dimensions, impregnated with metallic Si, and fired to produce a hollow honeycomb structure made of a Si-SiC material containing metallic Si between the SiC particles (Si-impregnated SiC). The hollow honeycomb structure produced had the following characteristics: Diameter (outer diameter) at a cross section perpendicular to the flow direction (axial direction) of the first fluid: 75 mm Diameter of the hollow section (inner wall) in a cross section perpendicular to the flow direction (axial direction) of the first fluid: 57 mm Axial length: 20mm Number of first bulkheads: 250 Number of secondary partitions: 1000 Thickness of first partition: 0.3mm Second partition thickness: 0.3mm Number of secondary partitions in the radial direction: 4 Outer and inner wall thickness: 1mm Porosity of the first partition wall, the second partition wall, the outer peripheral wall and the inner peripheral wall: 3% Isostatic strength: 200MPa Thermal conductivity (25℃): 60W / (m K) Next, continuous slits in the radial direction were formed in the prepared hollow honeycomb structure by cutting at the predetermined positions shown in Fig. 12. It should be noted that Fig. 12 is a cross-sectional view perpendicular to the axial direction of the hollow honeycomb structure, and detailed structure other than the slits is omitted. In Fig. 12, the straight lines within the circles represent the slits. The length of the slits in the axial direction of the hollow honeycomb structure was the same as the axial length of the hollow honeycomb structure. The slits continuous in the radial direction were provided on the outer peripheral wall and X number of second partition walls from the outer peripheral wall, and the number of slits in the circumferential direction was Y. The values ​​of X and Y are shown in Table 2.

[0086] Comparative Example 2 A honeycomb structure was produced under the same conditions as in Examples 4 and 5. In Comparative Example 2, no slits were formed in the hollow honeycomb structure.

[0087] Next, the hollow honeycomb structures obtained in the above examples and comparative examples were shrink-fitted into a covering member to produce a heat exchanger element. A stainless steel tubular member (thickness 1 mm) was used as the covering member. Next, a test jig was produced using the heat exchanger element, similar to the heat exchanger structure shown in Figs. 7 and 8, in which a second fluid flows around the outer periphery of the heat exchanger element. The test jig thus prepared was subjected to a heat resistance test in the same manner as above, and the temperature of the gas (first fluid) at which cracks were generated in the honeycomb structure was evaluated. The results are shown in Table 2.

[0088] [Table 2]

[0089] As shown in Table 2, in a heat exchanger using a hollow honeycomb structure without slits, cracks occurred in the hollow honeycomb structure when the temperature of the gas (first fluid) was 700°C (Comparative Example 2), whereas in a heat exchanger using a hollow honeycomb structure with slits, either the temperature of the gas at which cracks occurred in the hollow honeycomb structure became higher (Example 4) or no cracks occurred in the hollow honeycomb structure (Example 5). Therefore, it is considered that by providing slits in the hollow honeycomb structure, cracks become less likely to occur in the hollow honeycomb structure.

[0090] As can be seen from the above results, the present invention can provide a heat exchanger and a heat exchanger that can improve heat recovery efficiency and suppress an increase in pressure loss while suppressing the occurrence of cracks in the honeycomb structure. In addition, the present invention can provide a heat conductive member that can be mounted on the above heat exchanger and heat exchanger. [Explanation of symbols]

[0091] 10 Honeycomb structure 10a Hollow honeycomb structure 11 Peripheral wall 12 Bulkhead 12a 1st bulkhead 12b 2nd bulkhead 13 First end surface 14 Second end face 15 Cells 16 Inner wall 20 Covering material 30 Slit 40 Outer cylinder 41 Supply pipe 42 Discharge pipe 100,300 Heat exchange material 200 heat exchanger

Claims

1. A honeycomb structure having an outer peripheral wall and partition walls disposed inside the outer peripheral wall and defining a plurality of cells that serve as flow paths for a first fluid extending from a first end surface to a second end surface; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, A heat exchange member in which a slit is provided in a part of the outer peripheral wall and the second partition wall.

2. The heat exchange element according to claim 1 , wherein a portion of the second partition wall is provided with a slit that is continuous in a radial direction.

3. The heat exchange element according to claim 2 , wherein the slits extending continuously in the radial direction are also continuous with the outer peripheral wall.

4. a hollow honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, A heat exchange member in which a slit is provided in a part of at least one of the outer circumferential wall and the inner circumferential wall and in a part of the second partition wall.

5. The heat exchange element according to claim 4 , wherein a portion of the second partition wall is provided with a slit that is continuous in a radial direction.

6. The heat exchange element according to claim 5 , wherein the slits continuing in the radial direction are also continuing in at least one of the outer circumferential wall and the inner circumferential wall.

7. 7. The heat exchange element according to claim 2, wherein when the number of the second partition walls in the radial direction is n, the continuous slits are provided in n×0.3 or more (rounded down to nearest whole number) second partition walls from the outer peripheral wall side.

8. The heat exchange element according to any one of claims 1 to 7, wherein the number of the slits in the circumferential direction is 3 to 10.

9. The heat exchange member according to any one of claims 1 to 8, an outer cylinder arranged radially outwardly of the covering member at a distance therefrom so that a second fluid can flow around the outer periphery of the covering member; A heat exchanger comprising:

10. A heat conduction member including a honeycomb structure having an outer peripheral wall and partition walls disposed inside the outer peripheral wall and defining a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, the outer peripheral wall and the partition walls are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles; In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, A heat transfer member in which slits are provided in a portion of the outer peripheral wall and the second partition wall.

11. a slit continuous in a radial direction is provided in a portion of the second partition wall, The heat conducting member according to claim 10 , wherein the slits continuous in the radial direction are also continuous with the outer peripheral wall.

12. A heat conduction member including a hollow honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, the outer peripheral wall, the inner peripheral wall and the partition walls are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles; In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include first partition walls extending in a radial direction and second partition walls extending in a circumferential direction, A heat transfer member in which a slit is provided in a portion of at least one of the outer peripheral wall and the inner peripheral wall and in a portion of the second partition wall.

13. a slit continuous in a radial direction is provided in a portion of the second partition wall, The heat conducting member according to claim 12 , wherein the slits continuous in the radial direction are also continuous with at least one of the outer peripheral wall and the inner peripheral wall.

14. The heat conduction member according to claim 11 or 13, wherein when the number of the second partitions in the radial direction is n, the continuous slits are provided in n x 0.3 or more (rounded down to the nearest whole number) of the second partitions from the outer peripheral wall side.

15. The heat conducting member according to any one of claims 10 to 14, wherein the number of the slits in the circumferential direction is 3 to 10.

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