JP2008128128A - Heat transfer member and thermoelectric power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat transfer member as a heat exchanging body having high heat conductivity, being not easily deteriorated, and taking heat out of exhaust gas, and a thermoelectric power generation device. <P>SOLUTION: The heat transfer member 1 is formed as a honeycomb structure body provided with a cell structure part 3 formed out of ceramic material having thermal conductivity 40W/mK or greater at 300°C and including a bulkhead 3a forming a plurality of cells establishing communication between one end surface and another end surface, and an outer wall part 2 provided on an outer circumference of the cell structure part. The honeycomb structure body which is the heat transfer member 1 includes a plurality of cells penetrating in an axial direction divided by the bulkhead 3a, and is formed in a cylindrical shape. Also, the thermoelectric power generation device includes a heat transfer member 1 formed as the honeycomb structure body and a thermoelectric element as a thermoelectric conversion part converting heat from the heat transfer member 1 to electricity, and generates electric power by heat. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat transfer member used as a heat exchanger that recovers heat discharged together with exhaust gas from an engine, combustion equipment, or the like, and a thermoelectric power generation device.

  For example, in the case of automobiles, in order to further improve fuel efficiency, a technique for recovering heat in exhaust gas from an engine or the like and converting it into electric energy or the like has been studied. And the thermoelectric power generation apparatus which collect | recovers the thermal energy of the waste gas discharged | emitted from the engine of a motor vehicle, the fuel equipment with which the factory was equipped, etc. as an electrical energy is known (for example, patent documents 1-3). These thermoelectric power generation devices include heat exchange fins that recover the heat of exhaust gas and thermoelectric conversion modules (thermoelectric conversion elements), and generate power by the thermoelectric effect due to temperature differences in the thermoelectric conversion modules.

  And in order to transmit heat | fever efficiently to a thermoelectric conversion module, improvement of heat-transfer members, such as a heat exchange fin which collect | recovers the heat | fever of waste gas, is advanced.

JP 2006-207428 A JP 2005-295725 A Japanese Patent Application Laid-Open No. 2006-21780

  However, when the heat transfer member is a high thermal conductivity metal such as Cu, it cannot be used due to deterioration in the exhaust gas. In SUS that can be used in an exhaust gas environment, the thermal conductivity is low, and the required performance cannot be obtained. In order to more efficiently recover exhaust heat from engines and combustion equipment, it is necessary to enhance the functionality of heat transfer members used as heat exchangers that extract heat from exhaust gas.

  An object of the present invention is to provide a heat transfer member as a heat exchanger that extracts heat from exhaust gas and a thermoelectric power generation device that have high thermal conductivity and are not easily deteriorated.

  The present inventors have found that the above problem can be solved by adopting a configuration in which a heat transfer member is formed as a honeycomb structure with a ceramic material having a thermal conductivity of 40 W / mK or higher at 300 ° C. . That is, according to the present invention, the following heat transfer member and thermoelectric power generation device are provided.

[1] A cell structure part including a partition wall forming a plurality of cells communicating from one end face to another end face by a ceramic material having a thermal conductivity of 40 W / mK or more at 300 ° C., and an outer periphery of the cell structure part A heat transfer member formed as a honeycomb structure including an outer wall portion disposed on a surface.

[2] The heat transfer member according to [1], wherein the ceramic material is any one of Si-impregnated SiC, Si ₃ N ₄ , and SiC.

[3] The heat transfer member according to [1] or [2], wherein the cell density of the cells is 80 cells / in ² or more.

[4] The heat transfer member according to any one of [1] to [3], wherein a non-cell structure portion in which the cell structure portion is not formed is formed in a center portion along a height direction.

[5] The heat transfer member according to [4], wherein a ratio of (inner diameter of the cell structure portion) / (outer diameter of the outer wall portion) is 30% or more and 80% or less.

[6] The heat transfer according to any one of [1] to [5], wherein a ratio of (height from the one end surface to the other end surface) / (outer diameter of the outer wall portion) is 1 or less. Element.

[7] The heat transfer member according to any one of [1] to [6], wherein the heat transfer member includes a flat portion formed integrally with the outer wall portion on the outer wall portion and having a flat outer peripheral surface.

[8] A cell structure part including a partition that forms a plurality of cells communicating from one end face to another end face by a ceramic material having a thermal conductivity of 40 W / mK or more at 300 ° C., and an outer periphery of the cell structure part A heat transfer member formed as a honeycomb structure including an outer wall portion disposed on the surface, and heat transfer provided on the outer wall portion of the heat transfer member and transferring heat from the heat transfer member An auxiliary member, a thermoelectric conversion part that is attached in contact with the outer surface of the heat transfer auxiliary member and converts heat from the heat transfer member into electricity, and on the opposite side of the heat transfer member with respect to the thermoelectric conversion part A thermoelectric power generation device comprising: a cooling unit that is disposed and cools the thermoelectric conversion unit.

[9] The thermoelectric power generation device according to [8], wherein the outer wall portion of the heat transfer member and the inner side surface of the heat transfer auxiliary member are formed as contact surfaces that contact each other.

[10] The thermoelectric power generation device according to [8] or [9], wherein the outer surface of the heat transfer auxiliary member and the inner surface of the thermoelectric converter are formed as contact surfaces that contact each other.

[11] The outer surface of the heat transfer auxiliary member is formed as a flat portion, and the inner surface of the thermoelectric conversion portion that is in contact with the outer surface of the heat transfer auxiliary member is also formed as a flat portion. The thermoelectric power generation device described in 1.

[12] The thermoelectric power generation device according to any one of [8] to [11], wherein the thermoelectric conversion unit is arranged in a circumferential direction on the outer surface of the heat transfer auxiliary member.

[13] The thermoelectric power generation device according to any one of [8] to [12], wherein the cooling unit is formed in a cylindrical shape, and a cooling fluid hole through which the cooling fluid flows is formed in the cylindrical main body.

[14] In the above [13], the cooling part is formed with a fitting part that fits an outer surface side opposite to the inner surface side of the thermoelectric conversion part on the inner peripheral surface of the cylindrical main body part. The thermoelectric power generation device described.

  By forming a heat transfer member as a honeycomb structure with a ceramic material having a thermal conductivity of 40 W / mK or more at 300 ° C., a heat transfer member having good heat conductivity and durability can be obtained. .

  Further, by forming a thermoelectric power generation device including a heat transfer member formed as a honeycomb structure with a ceramic material having a thermal conductivity of 40 W / mK or more at 300 ° C., heat in exhaust gas is recovered, and electric energy Can be converted efficiently. The thermoelectric power generation device including the heat transfer member is also excellent in durability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and changes, modifications, and improvements can be added without departing from the scope of the invention.

  FIG. 1 is a plan view schematically showing one end face of the heat transfer member 1 of the present invention. FIG. 2 is a perspective view schematically showing the heat transfer member 1 formed as a honeycomb structure. The heat transfer member 1 includes a cell structure portion 3 including a partition wall 3a forming a plurality of cells communicating from one end surface to another end surface, and an outer wall portion 2 disposed on the outer peripheral surface of the cell structure portion 3. It is formed as a provided honeycomb structure. That is, the honeycomb structure which is the heat transfer member 1 has a plurality of cells penetrating in the axial direction partitioned by the partition walls 3a, and is formed in a cylindrical shape. The cell has a square cross section formed by the partition walls 3a. In addition to the cylindrical shape, the overall shape may be a quadrangular prism shape, a triangular prism shape, or the like, and the cell shape (the shape of the cell in the cross section perpendicular to the fluid flow path direction) may be a square shape, It may be a shape such as a square, a triangle, or a circle.

  And as shown in FIG. 1, the rim | limb part 5 for transferring heat to a thermoelectric conversion element is provided on the outer wall part 2 of the heat-transfer member 1 formed as a honeycomb structure. The rim portion 5 has a flat portion 5a formed on the outer peripheral surface thereof, and a thermoelectric conversion element (not shown) is attached to the flat portion 5a. The rim portion 5 is a heat transfer auxiliary member. The rim portion 5 may be formed as a separate body from the outer wall portion 2 or may be formed integrally.

The heat transfer member 1 is preferably formed of a ceramic material having a thermal conductivity of 40 W / mK or higher at 300 ° C., more preferably 50 W / mK or higher, and even more preferably 70 W / mK or higher. . When the heat transfer member 1 is formed of such a ceramic material, good heat conductivity is exhibited, and thus heat energy can be efficiently recovered. Si-impregnated SiC, Si ₃ N ₄ , SiC, or the like can be used as the ceramic material forming the heat transfer member 1.

The cell density (number of cells per unit cross-sectional area) of the honeycomb structure of the heat transfer member 1 is preferably 80 cells / in ² (cpsi) or more, more preferably 100 cpsi or more, More preferably, it is 150 cpsi or more. By forming the heat transfer member 1 so as to have such a cell density, the contact area of the exhaust gas flowing through the cell increases, and the thermal energy can be efficiently recovered. Further, by employing a ceramic material as a material for forming the heat transfer member 1, a honeycomb structure having the cell density as described above can be easily formed.

  Furthermore, the non-cell structure part 4 in which the cell structure part 3 is not formed may be formed along the height direction in the center part. The non-cell structure part 4 is preferably formed as a cavity. In this way, the non-cell structure part 4 is formed in the center so that the exhaust gas does not flow into the non-cell structure part 4 and only flows through the cell structure part 3 so that the heat of the exhaust gas is transferred to the heat transfer member. It becomes easy to be transmitted to the outer wall 2 of 1. Thereby, heat can be efficiently recovered.

  In other words, since the heat energy absorbed from the partition walls 3a of the cell is transmitted from the outer wall 2 to the thermoelectric element 20 via the rim 5, the non-cell structure 4 in which the cell structure 3 is not formed at the center. When formed, heat absorption can be performed in a region close to the outer wall 2, so that heat recovery efficiency can be increased. And if it forms so that ratio of (the inner diameter of the cell structure part 3) / (the outer diameter of an outer wall part) may be 30% or more and 80% or less, heat | fever can be collect | recovered efficiently.

  Further, it may be formed such that the ratio of (height from one end surface to the other end surface) / (outer diameter of the outer wall portion) is 1 or less. In the process of undeveloped laminar velocity distribution near the inlet end face, it has a higher gas / solid heat transfer coefficient than the fully developed state, so the height here, that is, the longer the length in the flow direction, the more it develops. Since the area ratio increases, the average heat transfer coefficient as a whole becomes small. When the ratio of the distance between the end faces to the outer wall portion outer shape exceeds 1, the influence of the decrease in the average heat transfer coefficient is large, so 1.0 or less is preferable. Furthermore, if the height here is large, the thermal stress due to the temperature difference in the height direction becomes excessive and the probability of breakage due to the thermal stress increases, so 1.0 or less is preferable from the viewpoint of preventing breakage due to the thermal stress.

Si-impregnated SiC, Si ₃ N ₄ , SiC, or the like can be employed as the ceramic material forming the heat transfer member 1, but it is particularly desirable to employ Si-impregnated SiC, and the case where Si-impregnated SiC is employed. explain. Si-impregnated SiC has a structure in which the SiC particle surface is surrounded by a solidified metal silicon melt and SiC is integrally joined via metal silicon, so that silicon carbide is shielded from oxygen-containing atmospheres and prevented from oxidation. Is done. Further, SiC has a feature of high thermal conductivity and easy heat dissipation, but SiC impregnated with Si is densely formed while exhibiting high thermal conductivity and heat resistance, and is sufficient as the heat transfer member 1. Indicates strength. In other words, the honeycomb structure made of Si-SiC (Si impregnated SiC) material has excellent heat resistance, thermal shock resistance, oxidation resistance, corrosion resistance against acids and alkalis, and high thermal conductivity. Indicates.

  More specifically, when the honeycomb structure has a Si-impregnated SiC composite material as a main component, if the Si content defined by Si / (Si + SiC) is too small, the bonding material is insufficient, and therefore adjacent SiC particles. Bonding between the Si phases becomes insufficient, and not only the thermal conductivity is lowered, but also it is difficult to obtain a strength capable of maintaining a thin-walled structure such as a honeycomb structure. On the other hand, if the Si content is too high, the honeycomb structure is excessively shrunk by firing due to the presence of metal silicon more than the SiC particles can be appropriately bonded together, resulting in a decrease in porosity, average It is not preferable in that adverse effects such as pore diameter reduction occur at the same time. Therefore, the Si content is preferably 5 to 50% by mass, and more preferably 10 to 40% by mass.

  Such Si-impregnated SiC has pores filled with metallic silicon, has a porosity of 0 or close to 0, is excellent in oxidation resistance and durability, and can be used for a long time in a high-temperature atmosphere. Once oxidized, an oxidation protective film is formed, so that no oxidative degradation occurs. Moreover, since it has high strength from room temperature to high temperature, a thin and lightweight structure can be formed. Furthermore, the thermal conductivity is as high as that of copper or aluminum metal, the far-infrared emissivity is also high, and since it is electrically conductive, it is difficult to be charged with static electricity.

  Next, a method for manufacturing the heat transfer member 1 formed as a honeycomb structure including a Si-impregnated SiC composite material as a main component will be described. First, a predetermined amount of C powder, SiC powder, binder, water or organic solvent is kneaded and molded to obtain a molded body having a desired shape. Next, the compact is placed in a reduced pressure inert gas or vacuum under a metal Si atmosphere, and the compact is impregnated with metal Si.

Even when Si ₃ N ₄ , SiC, or the like is adopted, the molding raw material is converted into clay, and the clay is extruded in the molding process, thereby forming a plurality of exhaust gas flow paths partitioned by the partition walls 3a. A honeycomb-shaped formed body having cells can be formed. By drying and firing this, the heat transfer member 1 formed as a honeycomb structure can be obtained.

As described above, by forming the heat transfer member 1 as a honeycomb structure with a ceramic material having a thermal conductivity of 40 W / mK or more at 300 ° C. such as Si-impregnated SiC, Si ₃ N ₄ , and SiC, it is favorable It can be set as the heat-transfer member 1 which shows a sufficient heat conductivity and also has durability.

  Next, the thermoelectric power generation device 100 will be described with reference to FIG. The thermoelectric power generation device 100 according to the present invention is attached in contact with the heat transfer member 1 formed as a honeycomb structure and the outer wall 2 of the heat transfer member 1 and transmits heat from the heat transfer member 1. A thermoelectric element 20 as a thermoelectric conversion unit that is attached in contact with the member 10 and the outer surface 12 of the heat transfer auxiliary member 10 and converts heat from the heat transfer member 1 into electricity, and is transferred to the thermoelectric element 20. And a cooling unit 30 disposed on the opposite side of the thermal member 1 to cool the thermoelectric element 20.

  As described above, the heat transfer member 1 is disposed on the cell structure portion 3 including the partition walls 3a forming a plurality of cells communicating from one end surface to the other end surface, and on the outer peripheral surface of the cell structure portion 3. The outer wall 2 is formed of a ceramic material having a thermal conductivity of 40 W / mK or more at 300 ° C.

  The outer wall portion 2 of the heat transfer member 1 and the inner side surface 11 of the heat transfer auxiliary member 10 are formed as contact surfaces that contact each other, and the heat transfer auxiliary member 10 is attached to the outer wall portion 2 of the heat transfer member 1. By forming in this way, the heat energy absorbed by the heat transfer member 1 is transmitted to the heat transfer auxiliary member 10.

  Further, the outer side surface 12 of the heat transfer auxiliary member 10 and the inner side surface 21 of the thermoelectric element 20 are formed as contact surfaces that contact each other. More specifically, the outer surface 12 of the heat transfer auxiliary member 10 is formed as a flat portion, and the inner surface 21 of the thermoelectric element 20 that contacts the outer surface 12 of the heat transfer auxiliary member 10 is also formed as a flat portion. The heat transfer auxiliary member 10 has a high thermal conductivity and preferably has a high temperature durability. For example, the heat transfer auxiliary member 10 can be formed using the same material as the heat transfer member 1. Alternatively, in a structure that does not easily come into contact with gas or outside air, a high thermal conductivity metal such as Cu can be used only for this member. Since the outer side surface 12 of the heat transfer auxiliary member 10 and the inner side surface 21 of the thermoelectric element 20 are formed as flat portions, they are in close contact with each other, and the heat energy from the heat transfer member 1 is transmitted to the thermoelectric element 20 satisfactorily. Is done.

  In FIG. 3, the heat transfer auxiliary member 10 is formed in a plate shape and attached to the heat transfer member 1, but as shown in FIG. 1, an integral tubular body into which the heat transfer member 1 is fitted. You may form as the rim | limb part 5 which is. In that case, in order to make the outer surface 12 contact with the thermoelectric element 20, it is good to form so that it may have a plane part. Alternatively, a honeycomb structure extruded in a shape having a flat outer periphery may be formed, and the thermoelectric element 20 may be bonded to the flat portion of the honeycomb structure without providing the heat transfer auxiliary member 10.

  The thermoelectric element 20 converts thermal energy into electric energy, and generates an electromotive force due to the Seebeck effect due to a temperature difference generated between the inner side surface 21 on the high temperature side and the outer side surface 22 on the low temperature side. A plurality of thermoelectric elements 20 are discretely arranged in the circumferential direction on the outer surface 12 of the heat transfer auxiliary member 10, and by arranging in this way, more thermoelectric elements 20 can be arranged. , Can efficiently convert thermal energy into electrical energy. The thermoelectric element 20 is formed with an electrode (not shown).

  The cooling unit 30 is formed in a cylindrical shape, and a cooling water hole 35 through which the cooling water flows is formed in the cylindrical main body 31. A plurality of cooling water holes 35 are formed in the circumferential direction so that the cooling water flows in the height direction of the cylindrical main body 31. Instead of the cooling water, air may be circulated through the cooling water hole 35 to perform air cooling. That is, the cooling water hole 35 is a cooling fluid hole. In the cooling unit 30, a fitting portion 36 is formed on the inner peripheral surface 32 of the cylindrical main body portion 31, and the outer surface 22 side of the thermoelectric element 20 is fitted to the fitting portion 36.

  In the thermoelectric power generation device 100 having the above configuration, the thermal energy absorbed by the heat transfer member 1 is transmitted to the thermoelectric element 20 via the heat transfer auxiliary member 10 and is converted into electric energy in the thermoelectric element 20.

  FIG. 4 shows an example in which the thermoelectric power generation device 100 is provided in an exhaust system of a vehicle. The thermoelectric power generation device 100 is an apparatus that is provided in a vehicle such as an automobile, introduces exhaust gas discharged from an engine, collects heat of the exhaust gas, and generates power. Specifically, the exhaust gas discharged from the engine 40 during operation of the engine 40 is a CC catalyst (a light-weight, high-cell density carrier that emphasizes temperature-ignitability immediately after the start of engine operation, Pt, Rh, Pd precious metals and oxygen Purification of NOx, HC, CO that cannot be treated with the CC catalyst under high flow rate operation conditions, such as the first catalyst unit 41 provided with a three-way catalyst supported on an alumina coat containing CeO2 as an occlusion component. After being introduced into the second catalyst unit 42 having a higher volume three-way catalyst), the thermoelectric power generation device 100 is introduced. As described above, the exhaust gas introduced into the cell structure 3 of the thermoelectric power generation device 100 absorbs thermal energy and is transmitted to the thermoelectric element 20 to generate electricity.

  In order to improve the power generation efficiency, the thermoelectric power generation device 100 may be provided in parallel to the exhaust gas flow path as shown in FIG. Moreover, as shown in FIG.5 (b), electric power generation efficiency can be improved further by providing the thermoelectric power generation device 100 in parallel and in series.

FIG. 6 shows the heat flux in the outer wall 2 of the heat transfer member 1 according to the cell density. The heat transfer member 1 formed of a ceramic material having a thermal conductivity of 40 W / mK or more and having a cell density of 80 cells / in ² (cpsi) or more has a heat flux / honeycomb cross-sectional area of the outer wall 2 of about 90 ×. ^{10 -6 W / m 2 / m} 2 or more indicates, it is understood that it is possible to satisfactorily transfer heat. That is, the heat transfer member 1 formed as a honeycomb structure from a ceramic material exhibits a good heat flux similar to that of a conventional metal fin-type heat transfer member.

  FIG. 7 shows the heat flux when the non-cell structure part 4 in which the cell structure part 3 is not formed is formed in the center part along the height direction. The inner diameter r = 0 is a case where the non-cell structure portion 4 is not formed, and the inner diameter r = 25.5 mm is a case where the non-cell structure portion 4 is formed in a cylindrical shape having a radius of 25.5 mm. The outer diameter is r = 48 mm. As shown in FIG. 7, it can be seen that when the inner diameter is large, the heat flux in the outer wall portion 2 is large, and good thermal conductivity is exhibited. That is, the ratio of (inner diameter of cell structure portion) / (outer diameter of outer wall portion) is preferably 30% or more and 80% or less.

As described above, the heat transfer member 1 formed of a ceramic material having a thermal conductivity of 40 W / mK or more and having a cell density of 80 cells / in ² (cpsi) or more has good durability and is easy to manufacture. At the same time, the thermal conductivity and heat flux are as good as those of conventional metal heat transfer members.

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

(Examples 1 to 11)
As the ceramic material forming the heat transfer member 1, Si-impregnated SiC, Si ₃ N ₄ , SiC, or the like was adopted to produce a heat transfer member, which was used as samples of Examples 1 to 11.

  In the case of Si-impregnated SiC, first, a predetermined amount of C powder, SiC powder or other raw material was kneaded with a binder, water or an organic solvent, and molded to obtain a molded body having a desired shape. Next, the compact was placed in a reduced pressure inert gas or vacuum under a metal Si atmosphere, and the compact was impregnated with metal Si.

Similarly, in the case of Si ₃ N ₄ and SiC, the forming raw material was kneaded and the kneaded material was extruded in the molding step to obtain a molded body. This was dried and fired to obtain a heat transfer member formed as a honeycomb structure.

  The cell pitch and wall thickness of the heat transfer member (honeycomb structure) were changed by changing the extrusion die. Moreover, the thing with different thermal conductivity (SiC) by the same material changed the thermal conductivity as a heat-transfer member by changing raw material mixing and baking conditions and adjusting the porosity.

(Comparative Examples 1-4)
In Comparative Examples 1 to 4, honeycomb-shaped heat transfer members having a predetermined cell pitch and wall thickness were produced from a SUS bulk body by electric discharge machining.

  And, a heat transfer member formed as a honeycomb structure, a heat transfer auxiliary member that transfers heat from the heat transfer member, a thermoelectric element that converts heat from the heat transfer member into electricity, and cooling that cools the thermoelectric element The thermoelectric power generation device provided with a part.

Attach a thermoelectric power generation device with a heat transfer member to the engine piping, set the ambient temperature around the thermoelectric power generation device to 25 ° C, introduce exhaust gas at a temperature of 500 ° C, and set the temperature of the outer wall (outer periphery) of the heat transfer member to It was measured. The honeycomb structure on the outer wall portion obtained with a constant heat transfer coefficient with the outside (a stainless steel water cooling device having a water channel inside is brought into contact with the outer periphery and the flow rate of water flowing through the water channel is constant) The heat flux per cross-sectional area at the end face was measured. Moreover, the pressure loss in calorie | heat amount 5Nm < ³ > / min was measured. L / D represents a ratio of (height from one end surface to the other end surface) / (outer diameter of the outer wall portion). Comparative Example 1 is a quotation from Patent Document 1, and the member is not circular but rectangular.

As shown in Table 1, a heat transfer member having a thermal conductivity of 40 W / mK can be formed by SiC, Si ₃ N ₄ , and Si-impregnated SiC. In particular, as shown in Example 9, Si-impregnated SiC exhibited a high thermal conductivity of 100 W / mK. Examples 1-11 are better than the comparative example 1 in which the heat flux and the pressure loss were formed by SUS. Further, Comparative Example 2 having an inner diameter / outer diameter ratio of less than 30% had a poor heat flux, and Comparative Example 3 having an inner diameter / outer diameter ratio exceeding 80% had a high pressure loss. Furthermore, Comparative Example 4 with L / D> 1 also had poor heat flux and high pressure loss.

  The heat transfer member of the present invention can be used as a heat exchanger that recovers heat discharged together with exhaust gas from automobiles, construction machines, industrial stationary engines, combustion equipment, and the like.

It is a top view which shows typically the end surface of a heat-transfer member. It is a perspective view which shows typically the heat-transfer member formed as a honeycomb structure. It is a top view which shows typically the end surface of a thermoelectric power generation device. It is explanatory drawing explaining the exhaust system of the vehicle carrying a thermoelectric power generation device. It is explanatory drawing explaining the thermoelectric power generation device arrange | positioned in multiple numbers. It is a figure which shows the heat flux in the outer wall part of the heat-transfer member by a cell density. It is a figure which shows the heat flux of the heat-transfer member in which the non-cell structure part was formed.

Explanation of symbols

1: heat transfer member, 2: outer wall part, 3: cell structure part, 3a: partition wall, 4: non-cell structure part, 5: rim part, 5a: flat part of rim part, 10: heat transfer auxiliary member, 11: Inner side surface of heat transfer auxiliary member, 12: outer side surface of heat transfer auxiliary member, 20: thermoelectric element (thermoelectric conversion part), 21: inner side surface of thermoelectric element, 22: outer side surface of thermoelectric element, 30: cooling part, 31 : Cylindrical main body, 32: inner peripheral surface of cylindrical main body, 33: outer peripheral surface of cylindrical main body, 35: cooling water hole, 36: fitting portion, 40: engine, 41: first catalyst portion, 42: first Two catalyst parts, 100: Thermoelectric power generation device.

Claims (14)

  On the outer peripheral surface of the cell structure portion including a partition wall forming a plurality of cells communicating from one end face to the other end face by a ceramic material having a thermal conductivity of 40 W / mK or more at 300 ° C. A heat transfer member formed as a honeycomb structure including an outer wall portion disposed. The heat transfer member according to claim 1, wherein the ceramic material is any one of Si-impregnated SiC, Si ₃ N ₄ , and SiC. The heat transfer member according to claim 1 or 2, wherein a cell density of the cells is 80 cells / in ² or more.   The heat transfer member according to any one of claims 1 to 3, wherein a non-cell structure part in which the cell structure part is not formed is formed in a center part along a height direction.   The heat transfer member according to claim 4, wherein a ratio of (inner diameter of the cell structure portion) / (outer diameter of the outer wall portion) is 30% or more and 80% or less.   The heat transfer member according to claim 1, wherein a ratio of (height from the one end surface to the other end surface) / (outer diameter of the outer wall portion) is 1 or less.   The heat transfer member according to any one of claims 1 to 6, further comprising a flat portion formed integrally with the outer wall portion on the outer wall portion and having a flat outer peripheral surface. A ceramic structure having a thermal conductivity of 40 W / mK or more at 300 ° C., including a cell structure part including a partition wall forming a plurality of cells communicating from one end face to another end face; and on the outer peripheral surface of the cell structure part A heat transfer member formed as a honeycomb structure having an outer wall portion disposed;
A heat transfer auxiliary member that is provided on the outer wall portion of the heat transfer member and transfers heat from the heat transfer member;
A thermoelectric conversion part that is attached in contact with the outer surface of the heat transfer auxiliary member and converts heat from the heat transfer member into electricity; and
A thermoelectric power generation device comprising: a cooling unit that is disposed on the opposite side of the heat transfer member with respect to the thermoelectric conversion unit and cools the thermoelectric conversion unit.   The thermoelectric power generation device according to claim 8, wherein the outer wall portion of the heat transfer member and the inner side surface of the heat transfer auxiliary member are formed as contact surfaces that contact each other.   The thermoelectric power generation device according to claim 8 or 9, wherein an outer surface of the heat transfer auxiliary member and an inner surface of the thermoelectric converter are formed as contact surfaces that contact each other.   11. The thermoelectric device according to claim 10, wherein the outer side surface of the heat transfer auxiliary member is formed as a flat portion, and the inner side surface of the thermoelectric conversion portion that contacts the outer side surface of the heat transfer auxiliary member is also formed as a flat portion. Power generation device.   The thermoelectric power generation device according to any one of claims 8 to 11, wherein the thermoelectric conversion unit is arranged in a circumferential direction on the outer surface of the heat transfer auxiliary member.   The thermoelectric power generation device according to any one of claims 8 to 12, wherein the cooling part is formed in a cylindrical shape, and a cooling fluid hole for circulating a cooling fluid is formed in the cylindrical main body part.   The thermoelectric power generation according to claim 13, wherein the cooling portion is formed with a fitting portion that fits an outer surface side opposite to the inner surface side of the thermoelectric conversion portion on an inner peripheral surface of the cylindrical main body portion. device.

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