JPH1136981A - Exhaust heat power generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a power generating function from being eliminated by preventing the peeling and damage of a thermoelectric converting module from occurring and to facilitate an assembly by simplifying a structure in an exhaust heat power generating device. SOLUTION: This exhaust heat power generating device comprises a thermoelectric converting module 14 with a flat hot end surface and low temperature end surface; an inner pipe 12 in which the exhaust gas from an engine is circulated and a flat part 12b connected to the hot end surface of the thermoelectric converting module is provided at least on a part of its outer periphery; a heat radiating member 13 with a flat part 13b connected to the cold end surface of the thermoelectric converting module; and outer shells 10 and 11 which are arranged around the inner pipe 12 at specified intervals and hold the heat radiating member 13 with smaller heat conductivity than the hear radiating member. The thermoelectric converting module 14 is fixedly held between the flat part 12b of the inner pipe 12 and the flat part 13b of the heat radiating member 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat power generator for recovering thermal energy of exhaust gas flowing through an exhaust pipe of an internal combustion engine or exhaust gas discharged from an incinerator or the like to generate electric energy.

[0002]

2. Description of the Related Art Conventionally, in automobiles and factories, for example, Japanese Patent Application Laid-Open Publication No. Sho 61-61 discloses a method of recovering thermal energy of exhaust gas discharged from an engine (internal combustion engine), a furnace or the like and converting it into electric power. Japanese Patent Application Laid-Open No. 254082, Japanese Patent Application Laid-Open No. 63-262075, and Japanese Patent Application Laid-Open No. 7-307493 are known.

FIG. 1 shows an exhaust heat power generator disclosed in Japanese Patent Application Laid-Open No. 63-262075. In this exhaust heat power generator, an exhaust pipe through which exhaust gas discharged from an automobile engine flows. 1, a box-shaped heat absorbing cylinder 2 having opposed flat surfaces is interposed.

[0004] A thermoelectric conversion module 3 is disposed on both surfaces of the heat absorption cylinder 2 so as to face each other. The high-temperature end face of the thermoelectric conversion module 3 and the plane of the heat absorption cylinder 2 are joined by screws or adhesive. .

Further, the low-temperature end face of the thermoelectric conversion module 3 and the water-cooling jacket 4 are arranged to face each other, and the low-temperature end face of the thermoelectric conversion module 3 and the cooling face of the water-cooling jacket 4 are joined by screws or adhesive. .

In the above-described exhaust heat power generator, the exhaust heat of the high-temperature exhaust gas flowing from the exhaust pipe 1 is transmitted to the high-temperature end face of the thermoelectric conversion module 3 through the plane of the heat absorption cylinder 2 and at the same time, the thermoelectric conversion module 3 Is cooled by cooling water flowing back through the water cooling jacket 4.

[0007] Then, according to the temperature gradient generated between the high-temperature end face and the low-temperature end face of the thermoelectric conversion module 3, power is generated by the thermoelectromotive force generated by the Seebeck effect, thereby recovering the thermal energy of the exhaust gas. And convert it to electric power.

FIG. 2 shows an exhaust heat power generator disclosed in Japanese Patent Application Laid-Open No. 61-254082. In this exhaust heat power generator, an exhaust pipe 5 through which exhaust gas discharged from an automobile engine flows. An inner cylinder 6 having a circular cross-sectional shape is interposed, and an outer cylinder 7 having a circular cross-sectional shape is arranged concentrically outside the inner cylinder 6 at a predetermined interval.

[0009] Further, between the outer peripheral surface of the inner cylinder 6 and the inner peripheral surface of the outer cylinder 7, a plurality of such members are provided such that the high-temperature end surface faces the inner cylinder 6 and the low-temperature end surface faces the outer cylinder side. Thermoelectric conversion element 8
Are arranged in an annular shape.

In the above-described exhaust heat power generator, the exhaust heat of the high-temperature exhaust gas flowing from the exhaust pipe 5 is transmitted to the high-temperature end face of the thermoelectric conversion element 8 via the inner cylinder 6, and the heat of the low-temperature end face is transferred to the outside. The heat is radiated to the outside through the cylinder 7.

The thermal energy generated by the Seebeck effect is generated in accordance with the temperature gradient generated between the low-temperature end and the high-temperature end of the thermoelectric conversion element 8, thereby recovering the heat energy of the exhaust gas. And convert it to electric power.

Further, Japanese Unexamined Patent Application Publication No. 7-307493 discloses an exhaust heat power generator in which a thermoelectric conversion module is wound between an inner cylinder and an outer shell having a circular cross section. In this exhaust heat power generation device, the thermoelectric conversion module is formed in a special shape so as to withstand thermal deformation due to a temperature difference between the inner cylinder and the outer cylinder, so that the thermoelectric conversion module between the inner side and the thermoelectric conversion module or the thermoelectric conversion module and the outer cylinder can be heat-treated. It is configured to ensure contact.

[0013]

However, in the exhaust heat power generator disclosed in Japanese Patent Application Laid-Open No. 63-262075, the cooling jacket 4 is fixed to the heat absorbing cylinder 2 by a method such as bonding or screwing. Has been taken.

Therefore, in the case of fixing by adhesion, there is a problem that the power generation function is easily lost due to peeling or breakage of the thermoelectric conversion module 3 due to vibration of the vehicle or the like.

In the case of fixing by screwing, a heavy water-cooling jacket 4 must be attached to the high-temperature heat collecting section via the thermoelectric conversion module 3, so that displacement due to mechanical vibration is reduced. It is necessary to attach firmly using a high-strength metal screw so that it does not occur. Generally, metal has a thermal conductivity about five times that of the thermoelectric conversion module 3, so that a large amount of heat flows into the water cooling jacket 4 via the screw portion, and as a result, There is a problem that the temperature difference between the high-temperature end and the low-temperature end is significantly reduced, and the power generation output is reduced.

In the exhaust heat power generator disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 61-254082, the area of the high-temperature end is smaller than that of the low-temperature end because the thermoelectric conversion elements 8 are arranged in an annular shape. As a result, there is a problem that the heat recovery efficiency of the exhaust gas is poor. Further, the thermoelectric conversion element 8 is provided so that good thermal contact can be obtained on both wall surfaces of the inner cylinder 6 and the outer shell 7 having a circular curved surface.
There is a problem that both end faces of the thermoelectric conversion element 8 must be processed with high accuracy in order to install the thermoelectric conversion element 8. Further, it is necessary to assemble the apparatus while assembling modules composed of several hundred or more thermoelectric conversion elements 8 and electrodes directly between the inner cylinder 6 and the outer cylinder 7, and there is a problem that the manufacturing process becomes complicated.

In the waste heat power generator disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-307493, it is necessary to process the thermoelectric conversion module into a special shape as described above. There is a problem that it is difficult to form the thermoelectric conversion element so as not to cause cracks, defects, and the like, and to mass-produce the thermoelectric conversion element.

The present invention has been achieved in view of the above-mentioned problems of the prior art, and an object thereof is to provide an exhaust gas discharged from an internal combustion engine, a combustion furnace, or the like, or a heating method using these exhaust gases. In the exhaust heat power generation device that heats the high-temperature end face with the heat medium that has been heated and cools the low-temperature end face with a heat medium such as air or cooling water, the heat collection efficiency from the heat source is improved, and the power generation output is increased. The purpose is to reduce the size of the device.

Another object of the present invention is to reduce the variation in heat transfer performance from a high-temperature end to a low-temperature end by using a highly versatile rectangular parallelepiped thermoelectric conversion module, thereby making the structure easy to manufacture. It is an object of the present invention to provide a waste heat power generation device capable of increasing the power generation output.

Another object of the present invention is to reduce the heat transfer efficiency due to breakage of the electrical joint due to thermal or mechanical vibration, thermal deformation, etc., and decrease in power generation output due to breakage of the thermoelectric conversion module. It is an object of the present invention to provide a waste heat power generation device capable of preventing the occurrence of heat.

Another object of the present invention is to provide a waste heat power generation device capable of reducing the number of steps for assembling a plurality of thermoelectric conversion modules.

Another object of the present invention is to provide a compact and highly reliable exhaust heat power generator.

[0023]

According to a first aspect of the present invention, there is provided a waste heat power generator comprising: a thermoelectric conversion module having a flat high-temperature end face and a low-temperature end face; The inner tube having a flat portion joined to the high-temperature end face of the thermoelectric conversion module, the heat dissipation member having the flat portion joined to the low-temperature end face of the thermoelectric conversion module, and a predetermined space around the inner tube. An outer shell having a holding portion for holding the heat dissipating member and having a heat conductivity smaller than that of the heat dissipating member, wherein the thermoelectric conversion module includes The structure is sandwiched between the flat portion and the flat portion of the heat dissipating member.

The exhaust heat power generator according to claim 2 of the present invention is
The outer shell comprises a first outer shell half and a second outer shell half joined so as to surround the outer circumference of the inner tube from both sides, and the holding portion is formed of the first and second outer shell halves. At least one is formed of a through-hole that is formed in a complementary shape so as to fit a part of the heat-dissipating member.

According to a third aspect of the present invention, there is provided a waste heat power generator,
The heat dissipating member is configured to be sandwiched and held by the outer shell and the thermoelectric conversion module in a border region of the through hole.

The exhaust heat power generator according to claim 4 of the present invention is
The heat dissipating member is fixed to the outer shell in advance in the vicinity of the border area of the through hole.

The exhaust heat power generator according to claim 5 of the present invention is
The outer shell is made of an elastic material.

The exhaust heat power generator according to claim 6 of the present invention is
A buffer member is provided between the holding portion of the outer shell holding the heat radiating member and the heat radiating member.

The exhaust heat power generator according to claim 7 of the present invention is
A heat insulator is provided in a space surrounded by the inner tube and the outer shell and in a region where the thermoelectric conversion module and the heat radiating member are not arranged.

[0030]

According to the exhaust heat power generator according to the first aspect of the present invention, the heat of the high-temperature heat medium such as the combustion gas or the high-temperature steam flowing inside the inner tube is applied to the flat portion provided in the inner tube. As a result, the high-temperature end face of the thermoelectric conversion module is heated.

At the same time, the low-temperature end face of the thermoelectric conversion module is cooled by a radiating member cooled by the atmosphere or cooling water.

Thus, an electromotive force is generated according to the temperature difference between the high-temperature end and the low-temperature end of the thermoelectric conversion module, and power generation is performed.

In this case, the heat conductivity of the outer shell that holds the heat radiating member and surrounds the inner tube is smaller than the heat conductivity of the heat radiating member, and the thermoelectric conversion module has the flat portion of both the inner tube and the heat radiating member. Since the structure is sandwiched between the thermoelectric conversion modules, sufficient thermal contact between the thermoelectric conversion module, the inner tube, and the heat radiating member is ensured. Therefore, most of the heat transmitted from the high-temperature heat medium is guided to the thermoelectric conversion module, and power can be efficiently generated. Thereby, the power generation output can be improved.

Further, since the thermoelectric conversion module has a simple structure of being sandwiched between the inner tube and the heat radiating member, it is easy to manufacture and the variation in the heat transfer characteristics can be reduced, thereby improving the functional reliability. Can be improved.

According to the exhaust heat power generator according to claim 2 of the present invention, the outer shell is composed of the first outer shell half and the second outer shell half.
Since the heat dissipation member is held in the framed area of the through hole formed in the outer shell, the thermoelectric conversion module, heat dissipation member, and outer shell can be easily assembled to the inner tube. Thus, the number of assembling steps can be reduced.

According to the exhaust heat power generator according to claim 3 of the present invention, since the fixing of the heat radiating member is performed by being sandwiched between the outer shell and the thermoelectric conversion module in the rim area of the through hole, the separate heat radiating member is provided separately. This eliminates the need for fixing parts, thereby achieving simplification of assembly and lowering the cost of the product by reducing the number of parts.

According to the fourth aspect of the present invention, since the heat radiating member is integrally fixed to the outer shell in advance, the thermoelectric conversion module is connected to the inner tube and the heat radiating member during assembly. And can be easily clamped and fixed between them, thereby improving the assembling accuracy.

According to the exhaust heat power generator according to claim 5 of the present invention, since the outer shell is formed of an elastic material, the thermoelectric conversion module can be fixed to the flat portion of the inner tube with uniform pressure during assembly. In addition, even when the inner tube thermally expands due to the heat from the high-temperature heat medium, the expansion pressure associated with the thermal expansion is relieved by the elastic deformation of the outer shell, so that the thermal contact portion of the thermoelectric conversion module can be prevented from fluctuating. It is possible to prevent the thermoelectric conversion module from being damaged by high pressure locally generated on both the high-temperature end and the low-temperature end of the conversion module.
Furthermore, it is possible to reduce the variation of the installation pressure between the plurality of installed thermoelectric conversion modules, thereby uniformly maintaining the amount of heat flowing into each thermoelectric conversion module,
Extremely stable power output can be obtained.

According to the exhaust heat power generator according to claim 6 of the present invention, since the buffer member is provided at the fastening portion between the heat radiating member and the outer shell, the thermoelectric conversion module is connected to the flat portion of the inner tube at the time of assembly. Can be fixed with a uniform pressure, and deformation of the inner tube and the outer shell can be prevented. Furthermore, even when the inner tube thermally expands due to heat from the high-temperature heat medium, the expansion pressure accompanying the expansion can be reduced by the buffer member, thereby preventing deformation of the inner tube, the outer shell, the heat radiation member, and the like.

Further, it is possible to reduce the variation in the installation pressure among the plurality of installed thermoelectric conversion modules, whereby the amount of heat flowing into each thermoelectric conversion module can be maintained uniformly, and an extremely stable power generation output can be obtained. Obtainable.

According to the exhaust heat power generator according to claim 7 of the present invention, the heat insulator is provided in the space surrounded by the inner tube and the outer shell and in the area where the thermoelectric conversion module and the heat radiating member are not arranged. By doing so, it is possible to prevent heat radiation due to width radiation from a region other than the flat portion of the inner tube, and more efficiently guide heat from the high-temperature heat medium to the thermoelectric conversion module.
The power generation output can be further improved.

[0042]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 3 to 6 show a first embodiment of the exhaust heat power generator according to the present invention. As shown in FIGS. 3 to 5, this exhaust heat power generation device has an inner pipe 12 through which exhaust gas from an engine as a high-temperature heat medium passes,
An outer shell 9 surrounding or surrounding 2, a heat radiating member 13 held by the outer shell 9, a thermoelectric conversion module 14 sandwiched between the heat radiating member 13 and the inner tube 12, etc. are provided.

Here, the inner pipe 12 has, at both ends in the longitudinal direction, a flange portion 12a for connection to an exhaust pipe (not shown) of the engine. As shown in FIG. Flat portions 12 each having an elliptical shape extending in the horizontal direction (X direction) and facing each other in the vertical direction (Z direction).
b is formed.

As shown in FIGS. 3 to 6, the outer shell 9 is divided in the vertical direction (Z direction), and the upper shell 20 and the lower shell 11 each have a U-shaped cross section.
It consists of The upper shell 10 and the lower shell 11 are assembled at predetermined intervals so as to surround the inner tube.
Through holes 10b and 11b are formed in regions facing 2b and 12b, and in the regions of the through holes 10b and 11b, the heat radiating member 13 is incorporated and held. In the joint region between the upper shell 10 and the lower shell 11, fastening ribs 10a extending in the longitudinal direction are provided.
A pair of fastening ribs 10a, 11a are joined to each other to form a bolt 15a.
And so on.

The heat dissipating member 13 serves as a low-temperature source of the thermoelectric conversion module 14, and includes a plurality of cooling fins 13 a projecting in the vertical direction.
flat portion 13b extending horizontally at the base of a
And a stepped portion 13c formed by rimming the outer periphery of the flat portion 13b.

The thermoelectric conversion module 14 has a high-temperature end face and a low-temperature end face which are parallel and flat to each other, and generates a thermoelectromotive force by the Seebeck effect based on a temperature difference generated between both end faces.

In assembling the components having the above-described configuration, first, as shown in FIGS.
2 so that the high-temperature end face of the thermoelectric conversion module 14 is in close contact with the flat portion 12b of the thermoelectric conversion module 1 from above and below.
4 and then the heat radiating member 13 is further arranged from the upper and lower outer sides so that the flat portion 13b of the heat radiating member 13 is in close contact with the low-temperature end face of the thermoelectric conversion module 14, and then the cooling fins 13a of the heat radiating member 13 penetrate. The step 13c of the heat radiating member 13 that passes through the holes 10b and 11b and is fitted to the steps 10c and 11c (see FIG. 6) formed on the outer periphery of the through holes 10b and 11b so as to form a complementary shape. The upper shell 10 and the lower shell 11 are brought closer together from above and below and joined together, and fastened with bolts 15.

According to the above configuration, each thermoelectric conversion module 14 is securely fixed by being sandwiched between the flat portion 12b of the inner tube 12 and the flat portion 13b of the heat radiation member 13.
The heat dissipating member 13 is sandwiched between the thermoelectric conversion module 14 and the outer shell 9 and securely fixed.

The upper shell 1 forming the outer shell 9
As a material of the lower shell 11 and the material of the lower shell 11, a material whose thermal conductivity is smaller than the thermal conductivity of the heat radiating member,
A ceramic material or stainless steel is used.
By forming the outer shell 9 from such a material having a low thermal conductivity, most of the heat released from the inner tube 12 can be guided to the thermoelectric conversion module 14, thereby performing high-efficiency power generation. Can be.

Further, by forming the outer shell 9 from an elastic material such as stainless steel, the fixed holding force (pressure) of the thermoelectric conversion module 14 sandwiched between the inner cylinder 12 and the heat radiating member 13 is increased. In addition, the spring effect of each of the lower shell 11 and the lower shell 11 ensures a certain level, and the stress generated when the inner cylinder 12 thermally expands is also reduced by the elastic deformation of the upper shell 10 and the lower shell 11.

Here, when a thin stainless steel plate having a thickness of about 1 mm to 2 mm is used as the elastic material for forming the outer shell 9, as shown in FIG. 7, the upper shell 100 (see FIG. 7A) and The lower shell 110 (see FIG. 7B) is formed by press molding or the like, and the edges of the through holes 100b, 110b are folded so as to protrude in the vertical direction (Z direction). Through hole 10
The bending stiffness of the region where 0b and 110b are provided can be increased, so that the thermoelectric conversion module 14 can be securely fixed even after assembly.

The outer shell shown in FIG.
In the case of using the lower shell 110), the heat radiating member 13 is configured such that the step portion 13c has the upper shell 100 and the lower shell 1
By being joined to the inner side surfaces 100c (not shown) and 110c (see FIG. 7B) of the outer peripheral portions of the respective through holes 100b and 110b, they are clamped and fixed.

FIGS. 8 to 10 show a second embodiment of the exhaust heat power generator according to the present invention. In this embodiment, the outer shell 30 is not assembled later as in the above-described embodiment. For example, the inner tube 12 is formed at both ends in the longitudinal direction by a method such as brazing, welding, or screwing. Is fixed in advance to the outer peripheral surface.

When assembling, the thermoelectric conversion module 14 is inserted through the through hole 30b provided in the outer shell 30, the high temperature end face is brought into close contact with the flat portion 12b of the inner tube 12, and the heat dissipating member 22 The heat dissipating member 22 is inserted so that the flat part 22b of the thermoelectric conversion module 14 is in close contact with the low-temperature end face of the thermoelectric conversion module 14, and a flange part 22c that is bordered on the outer peripheral part of the flat part 22b is formed in the outer peripheral area of the through hole 30b. Into the counterbore-shaped stepped portion 30c.

Then, as shown in FIG. 9, which is an enlarged view of a portion C in FIG. 8, a bolt 24 is used for fastening and fixing with a buffer member 23 for relaxing stress and the like interposed therebetween.

According to the above configuration, the step portion 30 c as the holding portion of the outer shell 30 holding the heat radiating member 22 and the heat radiating member 2
By the action of the cushioning member 23 disposed between the second flange portions 22c, the stress generated at the time of assembly or thermal expansion can be relaxed, whereby the thermoelectric conversion module 14 can be fixed with a desired clamping force. it can.

FIG. 11 and FIG. 12 show a third embodiment of the exhaust heat power generation device according to the present invention. In the present embodiment, the basic configuration is the same as that of the first embodiment, and a cushioning member 34 such as rubber is provided between the upper shell 40 and the lower shell 41 and the heat radiating member 33.
Similarly, a cushioning member 35 made of rubber or the like is also provided in the fastening areas 0, 41 and the like.
Is provided.

The relationship between the heat dissipating member 33 and the two shells 40 and 41 is, for example, as shown in FIG. 12A, the step portion 41 c of the through hole 41 b provided in the lower shell 41 and the heat dissipating member 33. The buffer member 34 is sandwiched in a region facing the step portion 33c formed on the outer periphery of the flat portion 33b.

On the other hand, in the fastening region between the shells 40 and 41, as shown in FIG.
The cushioning member 35 is sandwiched between the opposing areas of the upper shell 40 and the bolts 36.
The cushioning member 35 'is also sandwiched between
Fastening is performed by screwing 7.

According to the above configuration, when the upper shell 40 and the lower shell 41 forming the outer shell are fastened, or when the outer shell 40,
When fastening the heat dissipating member 33 to the heat dissipating member 41,
By compressing 35 and 35 ′, thermal contact between the high-temperature end face of the thermoelectric conversion module 14 and the flat portion 12 b of the inner cylinder 12, and the low-temperature end face of the thermoelectric conversion module 14 and the flat portion 33 b of the heat radiating member 33 are uniformly secured. In addition to this, the thermoelectric conversion module 14 can be shielded from a poor environment in which the exhaust heat power generation device is placed.

FIG. 13 is a sectional view showing a fourth embodiment of the exhaust heat power generator according to the present invention. In this embodiment, FIG.
As shown in the figure, the cross section is substantially hexagonal, that is, the flat portion 5
Outer tubes 60 and 61 having a substantially hexagonal cross section provided with a required number of inner tubes 50 having six surfaces 0b and through holes 60b for holding and fixing the heat radiating members 70 arranged opposite to the flat portions 50b. And a thermoelectric conversion module 14 and the like sandwiched between the heat radiating member 70 and the inner tube 50.

Here, the outer shells 60 and 61 are formed of a metal or a ceramic having a thermal conductivity smaller than that of the heat radiating member 30 as in the above-described embodiment. The outer shell has a two-part structure composed of an upper shell 60 and a lower shell 61, and a cushioning member 63 is provided between each of the fastening ribs 60a, 61a.
By screwing the bolt 66 and the nut 67 across the, the two are fastened.

The outer shell does not necessarily have to be divided into upper and lower parts, but may be divided into a number of shells and fixed by the above-described method at the respective fastening rib portions.

Further, this outer shell is connected and integrated by a hinge or the like at a corner E (five places in the case of six flat parts) shown in FIG. 13 and is restrained by the hinge. It can also be fixed with no start and end ribs.

The cushioning member may be interposed between the heat radiating member 70 and the outer shells 60 and 61.

As described above, since the present invention can cope with the inner pipe 50 having a shape having a large number of flat portions in the cross section in the direction perpendicular to the flow direction of the exhaust gas, the flow of the high-temperature heat medium, the pressure, etc. It can respond to various requirements for the inner tube, and can further expand the range of application.

FIG. 14 is a sectional view showing a fifth embodiment of the exhaust heat power generator according to the present invention. In this embodiment, FIG.
As shown in the figure, in a space surrounded by the inner tube 12 and the outer shells 10 and 11 and in a region where the thermoelectric conversion module 14 and the heat radiating member 13 are not arranged, the heat resistance is high and the heat conductivity is small, for example, glass. , Ceramics cotton, felt, beads and other heat insulators 80 are filled.

According to the above configuration, heat radiation due to radiation from the flat portion of the inner tube 12, that is, the area where the thermoelectric conversion module 14 is not in contact with the thermoelectric conversion module 14 is prevented, and the heat from the high-temperature heat medium is more efficiently transferred. 14 can be led.

In the above-described embodiment, the inner tube has a flat portion having two opposing surfaces or a flat portion having six surfaces. However, the present invention is not limited to this.
A shape having a flat portion having another number of surfaces can be employed.

Further, in the above-described embodiment, the case where the air-cooled fins are provided as the heat radiating member is shown, but other water-cooled jackets and the like can be used.

Further, as the cushioning member used in the present invention, heat-resistant silicon rubber, carbon gasket, metal gasket and the like can be used.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a conventional exhaust heat power generation device.

FIG. 2 is an external perspective view showing a conventional exhaust heat power generator.

FIG. 3 is an external perspective view showing one embodiment of a waste heat power generation device according to the present invention.

FIG. 4 is a sectional view taken along the line AA in FIG.

FIG. 5 is a sectional view taken along a line BB in FIG. 3;

FIGS. 6A and 6B are external perspective views of a shell constituting an outer shell of the exhaust heat power generation device according to the present invention, wherein FIG.

FIGS. 7A and 7B are external perspective views of another example of an outer shell, in which FIG. 7A is an external perspective view of an upper shell, and FIG.

FIG. 8 is a sectional view of a second embodiment of the exhaust heat power generation device according to the present invention, taken in a direction perpendicular to the flow direction of the high-temperature heat medium.

FIG. 9 is an enlarged cross-sectional view enlarging a portion C in FIG. 8;

FIG. 10 is a sectional view of a second embodiment of the exhaust heat power generator according to the present invention, taken in a flowing direction of a high-temperature heat medium.

FIG. 11 is a sectional view of a third embodiment of a waste heat power generator according to the present invention, taken in a direction perpendicular to the flow direction of a high-temperature heat medium.

12 is a partial enlarged view of the exhaust heat power generation device shown in FIG. 11, (a) is an enlarged sectional view of a D part in FIG. 11, and (b) is an enlarged sectional view of a fastening portion of an upper and a lower shell. .

FIG. 13 is a sectional view of a fourth embodiment of the exhaust heat power generation device according to the present invention, taken in a direction perpendicular to the flow direction of the high-temperature heat medium.

FIG. 14 is a sectional view of a fifth embodiment of the exhaust heat power generator according to the present invention, taken in a direction perpendicular to the flow direction of the high-temperature heat medium.

[Explanation of symbols]

 Reference Signs List 9 outer shell 10 upper shell 10a fastening rib 10b through hole 10c stepped portion 11 lower shell 11a fastening rib 11b through hole 11c stepped portion 12 inner tube 12b flat portion 13 heat dissipation member 13b flat portion 13c stepped portion 14 thermoelectric conversion module 22 heat dissipation Member 22b Flat portion 22c Flange portion 23 Buffer member 24 Bolt 30 Outer shell 30b Through hole 30c Step portion 33 Heat radiating member 33c Step portion 34, 35, 35 'Buffer member 36 Bolt 37 Nut 40 Upper shell 40a Fastening rib 41 Lower shell 41a Fastening rib 41b Through hole 50 Inner tube 50b Flat part 60 Upper shell 60a Fastening rib 60b Through hole 61 Lower shell 61a Fastening rib 61b Through hole 63 Buffer member 66 Bolt 67 Nut 70 Heat radiating member 80 Heat insulator 100 Upper shell 1 0a fastening rib 100b through holes 110 lower shell 110a fastening rib 110b through holes 110c inside surface

Continuation of front page (72) Inventor Masakazu Kobayashi Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Kenji Furutani Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Katsumi Amada Calsonic Co., Ltd. 5-24-15 Minamidai, Nakano-ku, Tokyo

Claims (7)

[Claims] 1. A thermoelectric conversion module having a flat high-temperature end face and a flat low-temperature end face, and an inner part having a flat portion joined to the high-temperature end face of the thermoelectric conversion module at least in a part of an outer periphery while flowing a high-temperature heat medium therein. A tube, a heat dissipating member having a flat portion joined to the low-temperature end face of the thermoelectric conversion module, and a holding portion arranged to surround the inner tube at a predetermined interval and holding the heat dissipating member. Having an outer shell having a thermal conductivity smaller than the thermal conductivity of the heat dissipating member, wherein the thermoelectric conversion module is sandwiched between a flat portion of the inner tube and a flat portion of the heat dissipating member. An exhaust heat power generator characterized by the above-mentioned. 2. The outer shell comprises a first outer shell half and a second outer shell half joined so as to surround the outer periphery of the inner tube from both sides, and the holding portion includes the first and second outer shells. Comprising a through-hole formed in at least one of the outer shell halves and being complementarily shaped so that a part of the heat dissipation member fits therein,
The exhaust heat power generator according to claim 1, wherein: 3. The exhaust heat power generator according to claim 2, wherein the heat radiating member is sandwiched and held by the outer shell and the thermoelectric conversion module in an edge region of the through hole. 4. The exhaust heat power generator according to claim 2, wherein the heat radiating member is fixed to the outer shell in advance in the vicinity of a border area of the through hole. 5. The exhaust heat power generator according to claim 1, wherein the outer shell is made of an elastic material. 6. A cushioning member for relaxing stress is provided between a holding portion of an outer shell holding the heat dissipation member and the heat dissipation member. The waste heat power generator according to any one of the above. 7. A heat insulator is provided in a space surrounded by the inner tube and the outer shell and in a region where the thermoelectric conversion module and the heat radiating member are not arranged.
A waste heat power generator according to any one of the above items 6 to 6.