Method for manufacturing a heat transfer member and a heat exchanger

Abstract

To provide a method for manufacturing a heat conductive member capable of improving sealability between a heat recovery member and an inner cylinder member.SOLUTION: A method for manufacturing a heat conductive member comprises: preparing a hollow heat recovery member 1 having an inner peripheral surface 2 and an outer peripheral surface 3 in an axial direction, and a first end surface 4a and a second end surface 4b in a direction perpendicular to the axial direction; inserting an inner cylinder member 30 into a hollow part 5 formed in an inside region of the inner peripheral surface 2; and plastically working the inner cylinder member 30 and fitting at least a portion of the inner cylinder member 30 with at least a portion of one or more types selected from the inner peripheral surface 2, the first end surface 4a and the second end surface 4b of the heat recovery member 1.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a heat transfer member and a heat exchanger. [Background technology]

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

[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. Such a heat exchanger can effectively utilize heat by exchanging heat from a high-temperature fluid (e.g., exhaust gas) to a low-temperature fluid (e.g., cooling water).

[0004] A heat exchanger that recovers heat from high-temperature gases such as automobile exhaust gases has been proposed (Patent Document 1), which includes a hollow heat recovery member (columnar honeycomb structure), a first outer cylindrical member that is fitted onto the surface of the outer wall of the heat recovery member, an inner cylindrical member that is fitted onto the surface of the inner wall of the heat recovery member, an upstream cylindrical member that has portions that are arranged at intervals radially inside the inner cylindrical member to form a flow path for a first fluid, a cylindrical connecting member that connects the upstream end of the first outer cylindrical member to the upstream side of the upstream cylindrical member to form a flow path for the first fluid, and a downstream cylindrical member that is connected to the downstream end of the first outer cylindrical member and has portions that are arranged at intervals radially outside the inner cylindrical member to form a flow path for the first fluid. This heat exchanger includes two seal members disposed on the outer peripheral surface of the inner cylindrical member and at least one of two seal portions provided on the outer peripheral surface of the inner cylindrical member, and the surfaces of the outer peripheral wall on the first end face side and the second end face side of the heat recovery member are fitted via at least one of the two seal members and two seal portions. By providing the seal members and seal portions in this manner, it is possible to prevent the heat recovery member from shifting in position due to the inflow of the first fluid or thermal expansion. It is also possible to prevent a decrease in heat recovery performance due to the inflow of the first fluid. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2021 / 171670 Summary of the Invention [Problem to be solved by the invention]

[0006] The seal member described in Patent Document 1 needs to be welded to the outer circumferential surface of the inner cylindrical member, but welding can be difficult. In addition, positioning the seal member relative to the outer circumferential surface of the inner cylindrical member is also difficult, and if the positioning is not appropriate, a gap will occur between the heat recovery member and the seal member. Furthermore, the seal portion described in Patent Document 1 needs to be formed in advance on the inner cylindrical member. Therefore, it is difficult to position the seal portion on the inner cylindrical member, and if the positioning is not appropriate, a gap will occur between the heat recovery member and the seal portion.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a method for manufacturing a heat conduction member that can improve the sealing performance between the heat recovery member and the inner cylindrical member. Another object of the present invention is to provide a heat exchanger that has excellent sealing properties between the heat recovery member and the inner cylindrical member. [Means for solving the problem]

[0008] As a result of intensive research to solve the above problems, the inventors discovered that by inserting an inner cylindrical member into the hollow portion of the heat recovery member and then plastically processing a predetermined position of the inner cylindrical member, it is possible to eliminate the need to position the sealing portion and improve the sealing performance between the heat recovery member and the inner cylindrical member, thereby completing the present invention.

[0009] That is, the present invention provides a shaft having an inner peripheral surface and an outer peripheral surface in the axial direction, and a first end surface and a second end surface in the direction perpendicular to the axial direction. and ceramics are the main component. Providing a hollow heat recovery member; inserting an inner cylindrical member into a hollow portion formed in an inner region of the inner circumferential surface; The inner cylindrical member bulge and fitting at least a portion of the inner cylindrical member to at least a portion of one or more selected from the inner circumferential surface, the first end surface, and the second end surface of the heat recovery member. The method for manufacturing a heat conducting member includes the steps of:

[0010] The present invention also provides a method for manufacturing a bearing having an inner peripheral surface and an outer peripheral surface in an axial direction and a first end surface and a second end surface in a direction perpendicular to the axial direction. and ceramics are the main component. A hollow heat recovery member; a first outer casing member fitted to the outer peripheral surface of the heat recovery member; an inner cylindrical member that is fitted to the heat recovery member so as to be in surface contact with a portion of the inner circumferential surface of the heat recovery member other than both axial end portions; an upstream cylindrical member having a portion disposed at a distance from the inner cylindrical member in a radial direction thereof to form a flow path for a first fluid; a cylindrical connecting member that connects an upstream end of the first outer cylindrical member and an upstream side of the upstream cylindrical member so as to form a flow path for the first fluid; a downstream cylindrical member connected to a downstream end of the first outer cylindrical member and having a portion disposed radially outside the inner cylindrical member at a distance so as to form a flow path for the first fluid; It is a heat exchanger comprising: [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a method for manufacturing a heat transfer member that can improve the sealing performance between the heat recovery member and the inner cylindrical member. Furthermore, according to the present invention, it is possible to provide a heat exchanger that has excellent sealing properties between the heat recovery member and the inner cylindrical member. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a cross-sectional view of a hollow heat recovery member taken parallel to the axial direction. [Figure 2] FIG. 1 is a perspective view of a hollow pillar-shaped honeycomb structure. [Figure 3] 10A and 10B are diagrams for explaining the inserting step of the inner cylindrical member. [Figure 4] FIG. 10 is a diagram illustrating a fitting process. [Figure 5] 10 is a cross-sectional view of a heat conduction member having an inner cylindrical member that has been subjected to bulging (plastic working) so as to be in surface contact with a first end face of a heat recovery member. FIG. [Figure 6] 1 is a cross-sectional view of a heat transfer member having an inner cylindrical member that has been subjected to bulging (plastic working) so as to be in surface contact with the axial center portion of the inner peripheral surface of the heat recovery member. [Figure 7]FIG. 1 is a cross-sectional view of a heat transfer member having an inner cylindrical member that has been subjected to bulging (plastic working) so as to be in surface contact with the entire inner circumferential surface of the heat recovery member. [Figure 8] FIG. 1 is a cross-sectional view of a heat transfer member having an inner cylindrical member that has been subjected to bulging (plastic working) so as to come into surface contact with the inner circumferential surface of the heat recovery member at two points. [Figure 9] FIG. 1 is a cross-sectional view of a heat conduction member having a buffer material between an inner cylindrical member that has been subjected to bulging (plastic working) and a heat recovery member. [Figure 10] 1 is a cross-sectional view parallel to the flow direction of a first fluid of a heat exchanger according to an embodiment of the present invention. [Figure 11] 11 is a cross-sectional view of the heat exchanger of FIG. 10 taken along line aa'. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the following embodiments, and it should be understood that modifications and improvements made to the following embodiments based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention are also within the scope of the present invention.

[0014] (1) Manufacturing method of thermal conductive material A method for manufacturing a heat conduction member according to an embodiment of the present invention includes a heat recovery member preparation step, an inner cylindrical member insertion step, and a fitting step. Each step will be described in detail below.

[0015] <Preparation process for heat recovery components> The heat recovery member preparation step is a step of preparing a hollow heat recovery member having inner and outer circumferential surfaces in the axial direction (the flow path direction of the first fluid) and first and second end faces in a direction perpendicular to the axial direction. A cross-sectional view parallel to the axial direction of a hollow heat recovery member (hereinafter sometimes simply referred to as "heat recovery member") is shown in Fig. 1. As shown in Fig. 1, the heat recovery member 1 has an inner circumferential surface 2 and an outer circumferential surface 3 in the axial direction, and a first end face 4a and a second end face 4b in a direction perpendicular to the axial direction.

[0016] The heat recovery member is not particularly limited as long as it has the above-mentioned structure, but is preferably a hollow columnar honeycomb structure. A perspective view of a hollow columnar honeycomb structure is shown in Fig. 2. As shown in Fig. 2, a hollow columnar honeycomb structure 10 has an inner peripheral wall 11, an outer peripheral wall 12, and partition walls 15 disposed between the inner peripheral wall 11 and the outer peripheral wall 12 to define a plurality of cells 14 that serve as flow paths for a first fluid and extend from a first end face 13a to a second end face 13b. In this specification, the term "hollow columnar honeycomb structure 10" refers to a columnar honeycomb structure 10 having a hollow region at the center in a cross section of the hollow columnar honeycomb structure 10 perpendicular to the flow direction of the first fluid.

[0017] The shape (external shape) of the hollow pillar-shaped honeycomb structure 10 is not particularly limited, and may be, for example, a circular cylinder, an elliptical cylinder, a square cylinder, or other polygonal cylinder. Furthermore, the shape of the hollow region in the hollow pillar-shaped honeycomb structure 10 is not particularly limited, and may be, for example, a circular cylinder, an elliptical cylinder, a quadrangular cylinder, or other polygonal cylinder. The shape of the hollow pillar-shaped honeycomb structure 10 and the shape of the hollow region may be the same or different, but from the viewpoint of resistance to external impacts, thermal stress, and the like, it is preferable that they are the same.

[0018] The shape of the cells 14 is not particularly limited, and may be a circle, an ellipse, a triangle, a rectangle, a hexagon, or any other polygon in a cross section perpendicular to the flow direction of the first fluid. Moreover, the cells 14 are preferably arranged radially in a cross section perpendicular to the flow direction of the first fluid. With such a configuration, the heat of the first fluid flowing through the cells 14 can be efficiently transferred to the outside of the hollow columnar honeycomb structure 10.

[0019] The thickness of the partition walls 15 is not particularly limited, but is preferably 0.1 mm to 1.0 mm, and more preferably 0.2 mm to 0.6 mm. By making the thickness of the partition walls 15 0.1 mm or more, it is possible to ensure sufficient mechanical strength of the hollow columnar honeycomb structure 10. Furthermore, by making the thickness of the partition walls 15 1.0 mm or less, it is possible to suppress problems such as 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.

[0020] The thicknesses of the inner circumferential wall 11 and the outer circumferential wall 12 are not particularly limited, but are preferably larger than the thickness of the partition wall 15. This configuration can increase the strength of the inner circumferential wall 11 and the outer circumferential wall 12, which are prone to damage (for example, cracks, fractures, etc.) due to external impacts, thermal stress caused by the temperature difference between the first fluid and the second fluid, and the like. The thicknesses of the inner peripheral wall 11 and the outer peripheral wall 12 are not particularly limited and may be adjusted appropriately depending on the application. For example, when the heat exchanger 100 is used for general heat exchange purposes, the thicknesses of the inner peripheral wall 11 and the outer peripheral wall 12 are preferably 0.3 mm to 10 mm, more preferably 0.5 mm to 5 mm, and even more preferably 1 mm to 3 mm. When the heat exchanger 100 is used for heat storage purposes, the thickness of the outer peripheral wall 12 may be set to 10 mm or more to increase the heat capacity of the outer peripheral wall 12.

[0021] The partition walls 15, the inner peripheral wall 11, and the outer peripheral wall 12 are mainly composed of ceramics. "Mainly composed of ceramics" means that the mass ratio of ceramics to the mass of all components is 50 mass % or more.

[0022] The porosity of the partition walls 15, the inner peripheral wall 11, and the outer peripheral wall 12 is not particularly limited, but is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. The porosity of the partition walls 15, the inner peripheral wall 11, and the outer peripheral wall 12 may be 0%. By setting the porosity of the partition walls 15, the inner peripheral wall 11, and the outer peripheral wall 12 to 10% or less, the thermal conductivity can be improved.

[0023] The partition wall 15, the inner peripheral wall 11, and the outer peripheral wall 12 preferably contain, as a main component, SiC (silicon carbide), which has high thermal conductivity. Examples of such materials include Si-impregnated SiC, (Si+Al)-impregnated SiC, metal composite SiC, recrystallized SiC, Si3N4, and SiC. Among these, it is preferable to use Si-impregnated SiC and (Si+Al)-impregnated SiC because they can be manufactured inexpensively and have high thermal conductivity.

[0024] The cell density (i.e., the number of cells 14 per unit area) in the cross section of the hollow pillar-shaped honeycomb structure 10 perpendicular to the axial direction is not particularly limited, but is preferably 4 to 320 cells / cm. 2 The cell density is 4 cells / cm 2 By setting the cell density to the above, it is possible to sufficiently secure the strength of the partition walls 15, and in turn the strength and effective GSA (geometric surface area) of the hollow columnar honeycomb structure 10 itself. 2 By setting the above, it is possible to suppress an increase in pressure loss when the first fluid flows.

[0025] The isostatic strength of the hollow columnar honeycomb structure 10 is not particularly limited, but is preferably 100 MPa or more, more preferably 150 MPa or more, and even more preferably 200 MPa or more. By making the isostatic strength of the hollow columnar honeycomb structure 10 100 MPa or more, it is possible to improve the durability of the hollow columnar honeycomb structure 10. The isostatic strength of the hollow columnar honeycomb structure 10 can be measured in accordance with the isostatic strength measurement method specified in JASO standard M505-87, an automotive standard issued by the Society of Automotive Engineers of Japan.

[0026] The diameter (outer diameter) of the outer peripheral wall 12 in a cross section perpendicular to the axial direction is not particularly limited, but is preferably 20 mm to 200 mm, more preferably 30 mm to 100 mm. By setting the diameter in this range, it is possible to improve the heat recovery efficiency. When the outer peripheral wall 12 is not circular, the diameter of the outer peripheral wall 12 is defined as the diameter of the largest inscribed circle inscribed in the cross-sectional shape of the outer peripheral wall 12. Furthermore, the diameter of the inner circumferential wall 11 in a cross section perpendicular to the axial direction is not particularly limited, but is preferably 1 mm to 50 mm, and more preferably 2 mm to 30 mm. If the cross section of the inner circumferential wall 11 is not circular, the diameter of the inner circumferential wall 11 is the diameter of the largest inscribed circle inscribed in the cross section of the inner circumferential wall 11.

[0027] The thermal conductivity of the hollow columnar honeycomb structure 10 is not particularly limited, but 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) at 25°C. By setting the thermal conductivity of the hollow columnar honeycomb structure 10 within this range, the thermal conductivity becomes good, and heat inside the hollow columnar honeycomb structure 10 can be efficiently transferred to the outside. The thermal conductivity value means a value measured by a laser flash method (JIS R1611-1997).

[0028] When exhaust gas is flowed as the first fluid through the cells 14 of the hollow columnar honeycomb structure 10, a catalyst may be supported on the partition walls 15 of the hollow columnar honeycomb structure 10. Supporting a catalyst on the partition walls 15 makes it possible to convert CO, NOx, HC, and other substances in the exhaust gas into harmless substances through a catalytic reaction, and also makes it 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.

[0029] The amount of catalyst (catalytic metal + support) supported is not particularly limited, but is preferably 10 to 400 g / L. When a catalyst containing a precious metal is used, the amount supported is not particularly limited, but is preferably 0.1 to 5 g / L. By setting the amount of catalyst (catalytic metal + support) supported to 10 g / L or more, the catalytic action is easily exhibited. Furthermore, by setting the amount of catalyst (catalytic metal + support) supported to 400 g / L or less, it is possible to suppress pressure loss and increases in production costs. The support is a carrier on which the catalytic metal is supported. As the support, one containing at least one selected from the group consisting of alumina, ceria, and zirconia can be used.

[0030] The hollow columnar honeycomb structure 10 can be manufactured in accordance with a method known in the art. For example, the hollow columnar honeycomb structure 10 can be manufactured according to the method described below. First, a clay containing ceramic powder is extruded into a desired shape to produce a honeycomb molded body. By selecting an appropriate die and tool, the shape and density of the cells 14, the shapes and thicknesses of the partition walls 15, the inner peripheral wall 11, and the outer peripheral wall 12, etc., can be controlled. The ceramics described above can be used as the material for the honeycomb molded body. For example, when manufacturing a honeycomb molded body primarily composed of a Si-impregnated SiC composite material, a predetermined amount of SiC powder is mixed with a binder and water and / or an organic solvent, and the resulting mixture is kneaded to form a clay, which is then molded to produce a honeycomb molded body of the desired shape. The resulting honeycomb molded body is then dried and impregnated with metal Si in a reduced-pressure inert gas or vacuum, followed by firing to produce a hollow columnar honeycomb structure 10 having cells 14 separated by partition walls 15.

[0031] <Insertion process of the inner cylindrical member> The step of inserting the inner cylindrical member is a step of inserting the inner cylindrical member into a hollow portion formed in the inner region of the inner circumferential surface of the heat recovery member. Here, a diagram for explaining the process of inserting the inner cylindrical member is shown in Fig. 3. Fig. 3 is a cross-sectional view parallel to the axial direction of the hollow heat recovery member. 3, the inner cylindrical member 30 is inserted into the hollow portion 5 formed in the inner region of the inner circumferential surface 2 from the second end face 4b side of the heat recovery member 1, and is arranged at a predetermined position. Note that although the inner cylindrical member 30 is inserted from the second end face 4b side of the heat recovery member 1 in FIG. 3, the inner cylindrical member 30 may also be inserted from the first end face 4a side of the heat recovery member 1.

[0032] It is preferable that the difference in diameter between the part of the inner cylindrical member 30 that is inserted into the hollow portion 5 of the heat recovery member 1 and the diameter of the hollow portion 5 of the heat recovery member 1 is 1 mm to 10 mm. By controlling the difference in diameter to this extent, it becomes easier to insert the inner cylindrical member 30 into the hollow portion 5 of the heat recovery member 1 and to perform the plastic working described below.

[0033] Before the insertion step of the inner cylindrical member 30, a buffer material may be placed in advance on the outer circumferential surface of the inner cylindrical member 30. By placing a buffer material in advance on the outer circumferential surface of the inner cylindrical member 30, it becomes possible to place the buffer material between the heat recovery member 1 and the inner cylindrical member 30 in the fitting step. The buffer material is not particularly limited, but examples thereof include a graphite sheet and a heat insulating mat.

[0034] The inner cylindrical member 30 is not particularly limited, and may have a uniform diameter in the axial direction, or may have a diameter that decreases and / or increases in the axial direction. It is preferable that the axial direction of the inner cylindrical member 30 coincides with the axial direction of the heat recovery member 1 , and that the central axis of the inner cylindrical member 30 coincides with the central axis of the heat recovery member 1 .

[0035] The material of the inner cylindrical member 30 is not particularly limited, but is preferably a metal from the viewpoint of manufacturability. Furthermore, if the inner cylindrical member 30 is made of a metal, it is advantageous in that it can be easily welded to other members, etc., as described below. For example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, etc. can be used as the inner cylindrical member 30. Among these, stainless steel is preferred because of its high durability, reliability, and low cost.

[0036] The thickness of the inner cylindrical member 30 is not particularly limited, but is preferably 0.1 mm or more, more preferably 0.3 mm or more, and even more preferably 0.5 mm or more. By making the thickness of the inner cylindrical member 30 0.1 mm or more, durability and reliability can be ensured. Furthermore, the thickness of the inner cylindrical member 30 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less. By making the thickness of the inner cylindrical member 30 10 mm or less, thermal resistance can be reduced and thermal conductivity can be increased.

[0037] <Mating process> The fitting process is a process of plastically processing the inner cylindrical member 30 to fit at least a portion of the inner cylindrical member 30 with at least a portion of one or more selected from the inner circumferential surface 2, the first end face 4a, and the second end face 4b of the heat recovery member 1. Here, in this specification, plastic working means working in which a workpiece (the inner cylindrical member 30) is deformed into a predetermined shape by applying force to the workpiece. The plastic working is not particularly limited, and examples thereof include bulging (stretching), spinning, and press working. Here, a diagram for explaining the fitting step is shown in Fig. 4. Fig. 4 is a cross-sectional view parallel to the axial direction of a hollow heat recovery member. Fig. 4 shows, as an example, a case where bulge forming is used as the plastic forming. Bulging is performed by placing a mold 200 on the outer peripheral surface of the inner cylindrical member 30 other than the portion to be bulged (in FIG. 4, the periphery of the portion corresponding to the second end surface 4b of the heat recovery member 1), and then compressing both shafts of the inner cylindrical member 30 in the axial direction while filling the inner cylindrical member 30 with high-pressure liquid. After bulging, the mold 200 is removed to obtain the inner cylindrical member 30 in which predetermined portions are fitted with the heat recovery member 1 by bulging. In Figure 4, as an example, an inner cylindrical member 30 engaged with the second end face 4b of the heat recovery member 1 is shown, but by changing the part to be bulged, an inner cylindrical member 30 engaged with each part of the heat recovery member 1 can be obtained.

[0038] In the fitting process, after the inner cylindrical member 30 is inserted into the hollow portion 5 of the heat recovery member 1, the inner cylindrical member 30 is deformed by plastic processing such as bulging, so that a seal portion 35 can be formed that conforms to the shape of the heat recovery member 1. Therefore, it is not necessary to form a positioned seal portion in the inner cylindrical member 30 in advance or to weld a seal member to the inner cylindrical member 30 as in the conventional case, and the sealing performance between the heat recovery member 1 and the inner cylindrical member 30 can be improved.

[0039] The plastic working such as bulging can be performed so that the inner cylindrical member 30 comes into surface contact with the first end face 4a and / or the second end face 4b of the heat recovery member 1. When a buffer material is arranged beforehand on the outer circumferential surface of the inner cylindrical member 30, the plastic working can be performed so that the inner cylindrical member 30 comes into indirect surface contact with the first end face 4a and / or the second end face 4b of the heat recovery member 1 via the buffer material. FIG. 4 shows an example of an inner cylindrical member 30 that has been bulged so as to come into surface contact with the second end face 4b (particularly, the outer periphery of the second end face 4b) of the heat recovery member 1. FIG. 5 shows an example of an inner cylindrical member 30 (a cross-sectional view parallel to the axial direction of the heat recovery member 1) that has been bulged so as to come into surface contact with the first end face 4a (particularly, the outer periphery of the first end face 4a) of the heat recovery member 1. Although not shown, the inner cylindrical member 30 may be bulged so as to come into surface contact with both the first end face 4a and the second end face 4b of the heat recovery member 1. By bulging so as to come into surface contact with these portions, the sealing performance between the heat recovery member 1 and the inner cylindrical member 30 can be stably improved.

[0040] The plastic working such as bulging can be performed so that the inner cylindrical member 30 comes into surface contact with a portion other than both axial ends of the inner circumferential surface 2 of the heat recovery member 1. When a buffer material is arranged on the outer circumferential surface of the inner cylindrical member 30 in advance, the plastic working can be performed so that the inner cylindrical member 30 comes into indirect surface contact with a portion other than both axial ends of the inner circumferential surface 2 of the heat recovery member 1 via the buffer material. 6 shows an example of an inner cylindrical member 30 (a cross-sectional view parallel to the axial direction of the heat recovery member 1) that has been bulged so as to have surface contact with the axial center portion of the inner circumferential surface 2 of the heat recovery member 1. By performing bulging so as to have surface contact with this portion, it is possible to stably improve the sealing performance between the heat recovery member 1 and the inner cylindrical member 30.

[0041] The plastic working such as bulging can be performed so that the inner cylindrical member 30 comes into surface contact with the entire inner peripheral surface 2 of the heat recovery member 1. When a buffer material is arranged on the outer peripheral surface of the inner cylindrical member 30 in advance, the plastic working can be performed so that the inner cylindrical member 30 comes into indirect surface contact with the entire inner peripheral surface 2 of the heat recovery member 1 via the buffer material. 7 shows an example (cross-sectional view parallel to the axial direction of the heat recovery member 1) of an inner cylindrical member 30 that has been bulged so as to be in surface contact with the entire inner circumferential surface 2 of the heat recovery member 1. By performing bulging so as to be in surface contact with this portion, it is possible to stably improve the sealing performance between the heat recovery member 1 and the inner cylindrical member 30.

[0042] The plastic working such as bulging can be performed so that the inner cylindrical member 30 comes into surface contact at two or more locations with the inner peripheral surface 2 of the heat recovery member 1. When a buffer material is arranged on the outer peripheral surface of the inner cylindrical member 30 in advance, the plastic working can be performed so that the inner cylindrical member 30 comes into indirect surface contact at two or more locations with the inner peripheral surface 2 of the heat recovery member 1 via the buffer material. 8 shows an example of an inner cylindrical member 30 that has been bulged so as to have surface contact with the inner circumferential surface 2 of the heat recovery member 1 at two locations (a cross-sectional view parallel to the axial direction of the heat recovery member 1). The upper limit of the number of contact locations is not particularly limited and can be set appropriately depending on the axial length of the heat recovery member 1, but is, for example, five locations. By performing bulging so as to have surface contact with these locations, the sealing performance between the heat recovery member 1 and the inner cylindrical member 30 can be stably improved.

[0043] 9 shows an example of an inner cylindrical member 30 (a cross-sectional view parallel to the axial direction of the heat recovery member 1) in which a buffer material 300 is arranged beforehand on the outer peripheral surface of the inner cylindrical member 30, and then the inner cylindrical member 30 is inserted into the hollow portion 5 of the heat recovery member 1 and then bulged. By arranging the buffer material 300 beforehand on the outer peripheral surface of the inner cylindrical member 30, the buffer material 300 is interposed between the heat recovery member 1 and the inner cylindrical member 30, and the sealing performance can be stably improved.

[0044] (2) Heat exchanger A heat exchanger according to an embodiment of the present invention includes a hollow heat recovery member, a first outer cylindrical member, an inner cylindrical member, an upstream cylindrical member, a cylindrical connecting member, and a downstream cylindrical member. Fig. 10 is a cross-sectional view of the heat exchanger according to the embodiment of the present invention, taken along a line parallel to the flow direction of the first fluid, and Fig. 11 is a cross-sectional view of the heat exchanger of Fig. 10, taken along line aa'. 10, a heat exchanger 100 according to an embodiment of the present invention includes a heat recovery member 1 (hollow columnar honeycomb structure 10), a first outer cylindrical member 20, an inner cylindrical member 30, an upstream cylindrical member 40, a cylindrical connecting member 50, and a downstream cylindrical member 60. The heat exchanger 100 according to an embodiment of the present invention can further include a second outer cylindrical member 70 and a valve mechanism 80. Each component will be described below.

[0045] <Heat recovery component 1> As shown in Fig. 1, the heat recovery member 1 has an inner peripheral surface 2 and an outer peripheral surface 3 in the axial direction, and a first end face 4a and a second end face 4b in a direction perpendicular to the axial direction. The heat recovery member 1 is not particularly limited, and a hollow columnar honeycomb structure 10 as shown in Fig. 2 can be used. The details of the heat recovery member 1 have already been explained above, so the explanation will be omitted.

[0046] <First outer cylindrical member 20> The first outer casing member 20 is fitted to the outer peripheral surface 3 of the heat recovery member 1. The fitting may be either direct or indirect, but direct fitting is preferable from the viewpoint of heat recovery efficiency. The first outer cylindrical member 20 is a cylindrical member having an upstream end 21a and a downstream end 21b. It is preferable that the axial direction of the first outer tubular member 20 coincides with the axial direction of the heat recovery member 1, and the central axis of the first outer tubular member 20 coincides with the central axis of the heat recovery member 1. The central position in the axial direction of the first outer tubular member 20 may coincide with the central position in the axial direction of the heat recovery member 1. Furthermore, the diameter (outer diameter and inner diameter) of the first outer tubular member 20 may be uniform along the axial direction, but at least a part of it (for example, both axial ends) may be reduced or increased in diameter. The first outer cylindrical member 20 is not particularly limited, and for example, a cylindrical member that fits onto the outer peripheral surface 3 of the heat recovery member 1 and covers the outer peripheral surface 3 of the heat recovery member 1 can be used.

[0047] Here, in this specification, "fitting" refers to the heat recovery member 1 and the first outer casing member 20 being fixed in a fitted state to each other. Therefore, the fitting of the heat recovery member 1 and the first outer casing member 20 includes fixing methods using fitting such as clearance fitting, interference fitting, and shrink fitting, as well as cases where the heat recovery member 1 and the first outer casing member 20 are fixed to each other by brazing, welding, diffusion bonding, etc.

[0048] The first outer tubular member 20 preferably has an inner circumferential surface shape that corresponds to the outer circumferential surface 3 of the heat recovery member 1. When the inner circumferential surface of the first outer tubular member 20 is in direct contact with the outer circumferential surface 3 of the heat recovery member 1, thermal conductivity is improved, and heat in the heat recovery member 1 can be efficiently transferred to the first outer tubular member 20.

[0049] From the viewpoint of increasing the heat recovery efficiency, it is preferable that the ratio of the circumferential area of ​​the portion of the outer circumferential surface 3 of the heat recovery member 1 that is circumferentially covered by the first outer tubular member 20 to the entire circumferential area of ​​the outer circumferential surface 3 of the heat recovery member 1 is high. Specifically, the ratio of the circumferential area is preferably 80% or more, more preferably 90% or more, and even more preferably 100% (i.e., the entire outer circumferential surface 3 of the heat recovery member 1 is circumferentially covered by the first outer tubular member 20). Note that the "surface of the outer peripheral surface 3" here refers to a surface parallel to the flow direction of the first fluid in the heat recovery member 1, and does not refer to a surface perpendicular to the flow direction of the first fluid in the heat recovery member 1 (first end surface 4a and second end surface 4b).

[0050] The material of the first outer cylindrical member 20 is not particularly limited, and the same material as that of the inner cylindrical member 30 described above can be used. Furthermore, the thickness of the first outer cylindrical member 20 is not particularly limited, and can be the same as that of the inner cylindrical member 30 described above.

[0051] <Inner cylindrical member 30> The inner cylindrical member 30 is fitted so as to be in surface contact with the inner peripheral surface 2 of the heat recovery member 1 except for both axial ends (4a, 4b). The fitting may be direct or indirect via another member (for example, the above-mentioned buffer material 300). The inner cylindrical member 30 is a cylindrical member having an upstream end 31a and a downstream end 31b.

[0052] The inner cylindrical member 30 can be in surface contact with the inner circumferential surface 2 of the heat recovery member 1 at two or more locations. Fig. 10 shows, as an example, a case where the inner cylindrical member 30 is in surface contact with the inner circumferential surface 2 of the heat recovery member 1 at two locations. The upper limit of the number of contact locations is not particularly limited and can be set appropriately depending on the axial length of the heat recovery member 1, but is, for example, five locations. By bringing the inner cylindrical member 30 and the heat recovery member 1 into surface contact in this manner, a stable seal between the heat recovery member 1 and the inner cylindrical member 30 is ensured.

[0053] The inner cylindrical member 30 can be in surface contact with the first end face 4a and / or the second end face 4b of the heat recovery member 1. For example, as shown in FIG. 4, the inner cylindrical member 30 can be in surface contact with the second end face 4b of the heat recovery member 1 (particularly, the outer periphery of the second end face 4b). Also, as shown in FIG. 5, the inner cylindrical member 30 can be in surface contact with the first end face 4a of the heat recovery member 1 (particularly, the outer periphery of the first end face 4a). Furthermore, although not shown, the inner cylindrical member 30 can be in surface contact with both the first end face 4a and the second end face 4b of the heat recovery member 1. By bringing the inner cylindrical member 30 and the heat recovery member 1 into surface contact in this manner, stable sealing between the heat recovery member 1 and the inner cylindrical member 30 is ensured.

[0054] 9, a buffer material 300 may be disposed between the heat recovery member 1 and the inner cylindrical member 30. By providing the buffer material 300, it is possible to make the heat recovery member 1 less susceptible to damage. As the buffer material 300, the materials described above can be used. The buffer material 300 can be placed only in the area where the heat recovery member 1 and the inner cylindrical member 30 are in surface contact. In this case, the heat recovery member 1 and the inner cylindrical member 30 are in indirect surface contact via the buffer material 300. However, the buffer material 300 may be placed not only in the area where the heat recovery member 1 and the inner cylindrical member 30 are in surface contact, but also in the area where they are not in surface contact.

[0055] The inner cylindrical member 30 preferably has a tapered section 32 whose diameter decreases from the position of the second end surface 4b of the heat recovery member 1 toward the downstream end 31b. By providing such a tapered section 32, it is possible to reduce the difference between the inner diameter of the downstream end 31b of the inner cylindrical member 30 and the inner diameter of the downstream end 41b of the upstream cylindrical member 40. In this case, during heat recovery suppression (when the on-off valve 83 is open), the flow velocity of the first fluid near the downstream end 41b of the upstream cylindrical member 40 (near the inlet A of the heat recovery passage during heat recovery promotion) can be made approximately the same as the flow velocity of the first fluid near the downstream end 31b of the inner cylindrical member 30 (near the outlet B of the heat recovery passage during heat recovery promotion). This reduces the pressure difference between the downstream end 41b of the upstream cylindrical member 40 and the downstream end 31b of the inner cylindrical member 30. As a result, the backflow phenomenon of the first fluid flowing from the heat recovery path outlet B toward the heat recovery path inlet A can be suppressed, and the heat blocking performance can be improved.

[0056] The inclination angle of the tapered portion 32 with respect to the axial direction of the inner cylindrical member 30 is preferably 45° or less, more preferably 42° or less, and even more preferably 40° or less. By controlling the inclination angle to such an angle, the flow of the first fluid passing between the inner cylindrical member 30 and the upstream cylindrical member 40 and entering the heat recovery member 1 can be suppressed during heat recovery suppression (when the on-off valve 83 is open), thereby improving the heat blocking performance. The lower limit of the inclination angle of the tapered portion 32 is not particularly limited, but from the viewpoint of making the heat exchanger 100 compact, it is generally 10°, and preferably 15°.

[0057] It is preferable that the upstream end 31a of the inner cylindrical member 30 is disposed at substantially the same position as the first end face 4a of the heat recovery member 1. With such a structure, when heat recovery is promoted (when the on-off valve 83 is closed), the flow path of the first fluid that passes between the inner cylindrical member 30 and the upstream cylindrical member 40 and enters the heat recovery member 1 becomes shorter, thereby improving the heat recovery performance. Here, in this specification, "approximately the same position as the first end face 4a of the heat recovery member 1" is a concept that includes not only the same position as the first end face 4a, but also a position that is shifted from the first end face 4a of the heat recovery member 1 by approximately ±10 mm in the axial direction of the heat recovery member 1.

[0058] The other features of the inner cylindrical member 30 have already been described above, so a description thereof will be omitted.

[0059] <Upstream Cylindrical Member 40> The upstream cylindrical member 40 has a portion that is arranged radially inward of the inner cylindrical member 30 at a distance so as to form a flow path for the first fluid. The upstream cylindrical member 40 is a cylindrical member having an upstream end 41a and a downstream end 41b. It is preferable that the axial direction of the upstream cylindrical member 40 coincides with the axial direction of the heat recovery member 1 , and that the central axis of the upstream cylindrical member 40 coincides with the central axis of the heat recovery member 1 .

[0060] It is preferable that the downstream end 41b of the upstream cylindrical member 40 extends downstream of the position of the second end face 4b of the heat recovery member 1. With this configuration, the distance between the vicinity of the downstream end 41b of the upstream cylindrical member 40 (near the inlet A of the heat recovery channel when heat recovery is promoted) and the vicinity of the downstream end 31b of the inner cylindrical member 30 (near the outlet B of the heat recovery channel when heat recovery is promoted) can be shortened, thereby reducing the pressure difference between them when heat recovery is suppressed (when the on-off valve 83 is open). As a result, the backflow phenomenon of the first fluid flowing from the outlet B of the heat recovery channel toward the inlet A of the heat recovery channel can be suppressed, and the heat blocking performance can be improved.

[0061] The structure of the upstream end 41a side of the upstream cylindrical member 40 is not particularly limited, and can be adjusted appropriately depending on the shape of another component (e.g., a pipe) to which the upstream end 41a of the upstream cylindrical member 40 is connected. For example, if the diameter of the other component is larger than the diameter of the upstream end 41a, the diameter of the upstream end 41a side may be increased as shown in FIG.

[0062] The method for fixing the upstream cylindrical member 40 is not particularly limited, but for example, it may be fixed to the first outer cylindrical member 20 via a cylindrical connecting member 50 described below. The fixing method is not particularly limited, and may be the same as the method for fixing the first outer cylindrical member 20 described above.

[0063] The material of the upstream cylindrical member 40 is not particularly limited, and the same material as that of the inner cylindrical member 30 described above can be used. Furthermore, the thickness of the upstream cylindrical member 40 is not particularly limited, and can be the same as that of the inner cylindrical member 30 described above.

[0064] <Cylindrical connecting member 50> The tubular connecting member 50 is a tubular member that connects the upstream end portion 21a of the first outer tubular member 20 and the upstream side of the upstream tubular member 40 so as to form a flow path for the first fluid. The connection may be either direct or indirect. In the case of an indirect connection, for example, the upstream end portion 71a of the second outer tubular member 70 (described later) may be disposed between the upstream end portion 21a of the first outer tubular member 20 and the upstream side of the upstream tubular member 40. The axial direction of the cylindrical connecting member 50 preferably coincides with the axial direction of the heat recovery member 1 , and the central axis of the cylindrical connecting member 50 preferably coincides with the central axis of the heat recovery member 1 .

[0065] The shape of the cylindrical connecting member 50 is not particularly limited, but may have a curved structure. By adopting such a structure, when heat recovery is promoted (when the on-off valve 83 is closed), the flow of the first fluid that enters from the heat recovery path inlet A and flows into the heat recovery member 1 can be made smooth, thereby reducing pressure loss.

[0066] The material of the cylindrical connecting member 50 is not particularly limited, and the same material as that of the inner cylindrical member 30 described above can be used. Furthermore, the thickness of the tubular connecting member 50 is not particularly limited, and can be the same as that of the inner tubular member 30 described above.

[0067] <Downstream Cylindrical Member 60> The downstream cylindrical member 60 is connected to the downstream end 21b of the first outer cylindrical member 20 and has a portion arranged at a distance radially outside the inner cylindrical member 30 so as to form a flow path for the first fluid. The connection may be either direct or indirect. In the case of an indirect connection, for example, the downstream end 71b of the second outer cylindrical member 70 (described later) may be arranged between the downstream cylindrical member 60 and the downstream end 21b of the first outer cylindrical member 20.

[0068] The downstream cylindrical member 60 is a cylindrical member having an upstream end 61a and a downstream end 61b. The axial direction of the downstream cylindrical member 60 preferably coincides with the axial direction of the heat recovery member 1 , and the central axis of the downstream cylindrical member 60 preferably coincides with the central axis of the heat recovery member 1 . The diameter (outer diameter and inner diameter) of the downstream cylindrical member 60 may be uniform along the axial direction, but may also be reduced or increased in diameter at least in part.

[0069] The material of the downstream cylindrical member 60 is not particularly limited, and the same material as that of the inner cylindrical member 30 described above can be used. Furthermore, the thickness of the downstream cylindrical member 60 is not particularly limited, and can be the same as that of the inner cylindrical member 30 described above.

[0070] <Second outer cylindrical member 70> The second outer cylindrical member 70 is disposed radially outward of the first outer cylindrical member 20 at a distance so as to form a flow path for the second fluid. The second outer cylindrical member 70 is a cylindrical member having an upstream end 71a and a downstream end 71b. The axial direction of the second outer cylindrical member 70 preferably coincides with the axial direction of the heat recovery member 1 , and the central axis of the second outer cylindrical member 70 preferably coincides with the central axis of the heat recovery member 1 .

[0071] It is preferable that the upstream end 71a of the second outer cylinder member 70 extends upstream beyond the position of the first end face 4a of the heat recovery member 1. With this configuration, it is possible to improve the heat recovery efficiency.

[0072] The second outer casing member 70 is preferably connected to a supply pipe 72 for supplying the second fluid to the region between the second outer casing member 70 and the first outer casing member 20, and a discharge pipe 73 for discharging the second fluid from the region between the second outer casing member 70 and the first outer casing member 20. The supply pipe 72 and the discharge pipe 73 are preferably provided at positions corresponding to both axial ends of the heat recovery member 1. Furthermore, the supply pipe 72 and the discharge pipe 73 may extend in the same direction or in different directions.

[0073] The second outer cylindrical member 70 is preferably disposed so that the inner peripheral surfaces of the upstream end 71a and downstream end 71b are in direct or indirect contact with the outer peripheral surface of the first outer cylindrical member 20. The method for fixing the inner surfaces of the upstream end 71a and downstream end 71b of the second outer tube member 70 to the outer surface of the first outer tube member 20 is not particularly limited, but may include fixing methods using fitting such as clearance fitting, interference fitting, and shrink fitting, as well as brazing, welding, diffusion bonding, etc.

[0074] The diameters (outer diameter and inner diameter) of the second outer cylindrical member 70 may be uniform along the axial direction, or at least a portion (e.g., the axial center portion, both axial ends, etc.) may be reduced or increased in diameter. For example, by reducing the diameter of the axial center portion of the second outer cylindrical member 70, the second fluid can be distributed throughout the entire outer periphery of the first outer cylindrical member 20 within the second outer cylindrical member 70 on the supply pipe 72 and discharge pipe 73 side. Therefore, the amount of the second fluid that does not contribute to heat exchange in the axial center portion is reduced, thereby improving heat exchange efficiency.

[0075] The material of the second outer cylindrical member 70 is not particularly limited, and the same material as that of the inner cylindrical member 30 described above can be used. Furthermore, the thickness of the second outer cylindrical member 70 is not particularly limited, and can be the same as that of the inner cylindrical member 30 described above.

[0076] <Valve mechanism 80> The valve mechanism 80 has an on-off valve 83 arranged on the downstream end 31b side of the inner cylindrical member 30. The on-off valve 83 is rotatably supported by a bearing 81 arranged radially outside the downstream cylindrical member 60 and is fixed to a shaft 82 arranged to penetrate the downstream cylindrical member 60 and the inner cylindrical member 30.

[0077] By arranging the bearing 81 radially outside the downstream cylindrical member 60, the bearing 81 is not exposed to high-temperature exhaust gas, making the bearing 81 less likely to deteriorate. As a result, the on-off valve 83 can be stably closed during heat recovery promotion, improving heat recovery performance. In addition, since the bearing 81 is not present in the flow path of the first fluid, pressure loss can also be reduced. Furthermore, because the bearing 81 is arranged radially outside the downstream cylindrical member 60, there is no need to secure a space for arranging the bearing 81 between the radial outside of the inner cylindrical member 30 and the downstream cylindrical member 60, and this space can be made smaller, allowing the heat exchanger 100 to be made smaller and lighter.

[0078] The valve mechanism 80 is not particularly limited as long as it has the above-described structure. Note that the structure of the valve mechanism 80 itself is known in the art, and therefore known valve mechanisms can be applied to the heat exchanger 100 according to the embodiment of the present invention. In addition, the shape of the on-off valve 83 may be selected appropriately depending on the shape of the inner cylindrical member 30 in which the on-off valve 83 is arranged.

[0079] The valve mechanism 80 can drive (rotate) the shaft 82 by an actuator (not shown). The on-off valve 83 rotates together with the shaft 82, so that the on-off valve 83 can be opened and closed. The on-off valve 83 is configured to be able to adjust the flow of the first fluid inside the inner cylindrical member 30. Specifically, by closing the on-off valve 83 when promoting heat recovery, the first fluid can be circulated from the heat recovery path inlet A to the columnar honeycomb structure 10. In addition, by opening the on-off valve 83 when suppressing heat recovery, the first fluid can be circulated from the downstream end 31b side of the inner cylindrical member 30 to the downstream cylindrical member 60 and discharged to the outside of the heat exchanger 100.

[0080] <First fluid and second fluid> The first fluid and the second fluid used in the heat exchanger 100 are not particularly limited, and various liquids and gases can be used. For example, when the heat exchanger 100 is installed in an automobile, exhaust gas can be used as the first fluid, and water or antifreeze (LLC as defined in JIS K2234:2006) can be used as the second fluid. The first fluid can also be a fluid with a higher temperature than the second fluid.

[0081] <Method for manufacturing heat exchanger 100> The heat exchanger 100 can be manufactured in accordance with a method known in the art. For example, when a hollow columnar honeycomb structure 10 is used as the heat recovery member 1, the heat exchanger 100 can be manufactured in accordance with the method described below. First, a clay containing ceramic powder is extruded into a desired shape to produce a honeycomb molded body. By selecting an appropriate die and tool, the shape and density of the cells 14, the shapes and thicknesses of the partition walls 15, the inner peripheral wall 11, and the outer peripheral wall 12, etc., can be controlled. The ceramics described above can be used as the material for the honeycomb molded body. For example, when manufacturing a honeycomb molded body primarily composed of a Si-impregnated SiC composite material, a predetermined amount of SiC powder is mixed with a binder and water and / or an organic solvent, and the resulting mixture is kneaded to form a clay, which is then molded to produce a honeycomb molded body of the desired shape. The resulting honeycomb molded body is then dried and impregnated with metal Si in a reduced-pressure inert gas or vacuum, followed by firing to produce a hollow columnar honeycomb structure 10 having cells 14 separated by partition walls 15.

[0082] Next, the hollow columnar honeycomb structure 10 is inserted into the first outer cylindrical member 20, and the first outer cylindrical member 20 is fitted onto the surface of the outer peripheral wall 12 of the hollow columnar honeycomb structure 10. Next, the inner cylindrical member 30 is inserted into the hollow region of the hollow columnar honeycomb structure 10, and the inner cylindrical member 30 is fitted onto the surface of the inner peripheral wall 11 of the hollow columnar honeycomb structure 10. The fitting method at this time is not particularly limited, but plastic working such as bulging is preferred. The use of plastic working eliminates the need to previously form a positioned seal portion in the inner cylindrical member 30 or to weld a seal member to the inner cylindrical member 30, and can improve the sealing performance between the hollow columnar honeycomb structure 10 and the inner cylindrical member 30. Next, the second outer cylindrical member 70 is positioned and fixed radially outward of the first outer cylindrical member 20. The supply pipe 72 and the discharge pipe 73 may be fixed to the second outer cylindrical member 70 in advance, or may be fixed to the second outer cylindrical member 70 at an appropriate stage. Next, the upstream cylindrical member 40 is placed radially inside the inner cylindrical member 30, and the upstream end portion 21a of the first outer cylindrical member 20 is connected to the upstream side of the upstream cylindrical member 40 using a cylindrical connecting member 50. Next, the downstream cylindrical member 60 is placed and connected to the downstream end portion 21b of the first outer cylindrical member 20. Next, the valve mechanism 80 is attached to the downstream end portion 31b of the inner cylindrical member 30. The arrangement and fixing (fitting) order of each member is not limited to the above, and may be changed as appropriate within the range of manufacturability. [Explanation of symbols]

[0083] 1 Heat recovery components 2 Inner surface 3 Outer surface 4a 1st end surface 4b 2nd end face 5 Hollow part 10. Pillar honeycomb structure 11 Inner wall 12 Peripheral wall 13a First end surface 13b Second end face 14 cells 15 Bulkhead 20 First outer cylindrical member 21a Upstream end 21b Downstream end 30 Inner cylinder member 31a Upstream end 31b Downstream end 32 Tapered section 35 Seal part 40 upstream cylindrical member 41a Upstream end 41b Downstream end 50 Cylindrical connecting member 60 downstream cylindrical member 61a Upstream end 61b Downstream end 70 second outer cylindrical member 71a Upstream end 71b Downstream end 72 Supply pipe 73 Discharge pipe 80 Valve mechanism 81 Bearings 82 Shaft 83 On-off valve 100 heat exchanger 200 molds 300 Cushioning material

Claims

1. preparing a hollow heat recovery member made primarily of ceramic, the hollow heat recovery member having inner and outer circumferential surfaces in an axial direction and first and second end faces in a direction perpendicular to the axial direction; inserting an inner cylindrical member into a hollow portion formed in an inner region of the inner circumferential surface; a step of bulging the inner cylindrical member and fitting at least a portion of the inner cylindrical member to at least a portion of one or more selected from the inner circumferential surface, the first end surface, and the second end surface of the heat recovery member; A method for manufacturing a heat conduction member, comprising:

2. The method for manufacturing a heat conduction member according to claim 1 , wherein the bulge forming is performed so that the inner cylindrical member is in surface contact with the first end face and / or the second end face.

3. The method for manufacturing a heat conduction member according to claim 1 or 2, wherein the bulge forming is performed so that the inner cylindrical member is in surface contact with a portion of the inner circumferential surface other than both axial ends thereof.

4. The method for manufacturing a heat conduction member according to claim 1 or 2, wherein the bulge forming is performed so that the inner cylindrical member is in surface contact with the entire inner circumferential surface.

5. The method for manufacturing a heat conduction member according to any one of claims 1 to 4, wherein the bulge forming is performed so that the inner cylindrical member comes into surface contact with the inner circumferential surface at two or more points.

6. The method for manufacturing a heat conduction member according to any one of claims 1 to 5, wherein the difference between the diameter of the portion of the inner tube member that is inserted into the hollow portion of the heat recovery member and the diameter of the hollow portion of the heat recovery member is 1 mm to 10 mm.

7. The method for manufacturing a heat conduction member according to any one of claims 1 to 6, further comprising a step of preliminarily arranging a buffer material on an outer peripheral surface of the inner cylindrical member before inserting the inner cylindrical member into the hollow portion of the heat recovery member.

8. The method for manufacturing a heat conduction member according to any one of claims 1 to 7, wherein the heat recovery member is a hollow columnar honeycomb structure having an inner peripheral wall, an outer peripheral wall, and partition walls arranged between the inner peripheral wall and the outer peripheral wall, which partition walls form 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.

9. a hollow heat recovery member made primarily of ceramics, the hollow heat recovery member having an inner circumferential surface and an outer circumferential surface in an axial direction and a first end surface and a second end surface in a direction perpendicular to the axial direction; a first outer casing member fitted to the outer peripheral surface of the heat recovery member; an inner cylindrical member that is fitted to the heat recovery member so as to be in surface contact with a portion of the inner circumferential surface of the heat recovery member other than both axial end portions; an upstream cylindrical member having a portion disposed at a distance from the inner cylindrical member in a radial direction thereof to define a flow path for a first fluid; a cylindrical connecting member that connects an upstream end of the first outer cylindrical member and an upstream side of the upstream cylindrical member so as to form a flow path for the first fluid; a downstream cylindrical member connected to a downstream end of the first outer cylindrical member and having a portion disposed radially outside the inner cylindrical member at a distance so as to form a flow path for the first fluid; A heat exchanger comprising:

10. The heat exchanger according to claim 9 , wherein the inner cylindrical member is in surface contact with the inner circumferential surface of the heat recovery member at two or more locations.

11. The heat exchanger according to claim 9 or 10, wherein the inner cylindrical member is in surface contact with the first end surface and / or the second end surface of the heat recovery member.

12. The heat exchanger according to any one of claims 9 to 11, wherein a buffer material is disposed between the heat recovery member and the inner cylindrical member.

13. The heat exchanger according to claim 12 , wherein the buffer material is disposed only in a portion where the heat recovery member and the inner cylindrical member are in surface contact with each other.

14. The heat exchanger according to any one of claims 9 to 13, wherein the heat recovery member is a hollow columnar honeycomb structure having an inner peripheral wall, an outer peripheral wall, and partition walls arranged between the inner peripheral wall and the outer peripheral wall, which partition walls form a plurality of cells that serve as a flow path for the first fluid and extend from a first end face to a second end face.

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