JP2000073754A - Exhaust heat recovery equipment for vehicles - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To recover the exhaust heat of a vehicle, which can improve the thermoelectric conversion efficiency by a thermoelectric element and can recover heat from exhaust gas as electricity without newly providing a cooling circuit dedicated to the thermoelectric element. Providing equipment. SOLUTION: A vehicle in which a cylindrical thermoelectric module 3 including a plurality of thermoelectric elements 4a, 4b, 4c, 4d is interposed between an engine and an exhaust manifold that guides exhaust gas from the engine to a catalyst. In the exhaust heat recovery device of FIG.
a, 4b, 4c, and 4d are provided on the exhaust manifold-side end face of the thermoelectric module 3 and the low-temperature joint section 6 is provided on the engine-side end face.
The heterogeneous conductors constituting the above were arranged in parallel with the flow direction of the exhaust gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle exhaust heat recovery apparatus for recovering heat of exhaust gas flowing inside an automobile exhaust pipe as electricity using a thermoelectric element.

[0002]

2. Description of the Related Art As an apparatus for recovering a large amount of exhaust heat discharged from an engine, a water jacket is provided around an exhaust pipe, and the heat is recovered by cooling water flowing inside the apparatus (Japanese Utility Model Application Laid-Open No. 62-12730). And a thermoelectric element attached to the surface of an exhaust pipe to convert the amount of heat into electricity so as to effectively use energy (Japanese Patent Application Laid-Open No. Hei 8-26164).

[0003]

FIG. 7 is a cross-sectional view of the above-described embodiment.
2 shows an exhaust manifold 82 described in Japanese Patent Application Laid-Open No. 12730. This exhaust manifold 82
Then, when the temperature of the cooling water at the time of starting the engine 81 or the like is low, the amount of heat recovered from the exhaust gas to the cooling water in the water jacket 83 increases the cooling water temperature early.
This is effective for shortening the warm-up operation and supplying heat to the heater in cold weather. On the other hand, when the cooling water temperature is sufficiently high,
In order to prevent overheating of the engine 81, the control valve stops the cooling water flowing into the water jacket 83 in the exhaust manifold 82, thereby preventing the recovery of heat from the exhaust gas. For this reason,
While the heat from the exhaust gas cannot be used effectively,
The cooling water remaining in the water jacket 83 becomes higher in temperature due to the exhaust gas flowing in the exhaust manifold 82, and the internal pressure increases due to boiling, which may deform the water jacket 83 and the piping of the cooling water in the middle. Occurs. For this reason, some structures have been proposed in which the cooling water is drained from the water jacket 83 and the cooling water piping while the flow of the cooling water is stopped, but all of these structures are complicated and expensive. FIG.
1 shows an exhaust heat power generation system described in Japanese Patent Application Laid-Open No. 266104. In this exhaust heat power generation system, a cooling water passage 92 through which a cooling water 94 dedicated to exhaust heat power generation having a radiator 94 dedicated to heat power generation is arranged on one surface of a thermoelectric power generation unit 91 having a thermoelectric power generation element. An exhaust passage 93 through which the exhaust gas 95 of the engine is guided is disposed on the other side of the engine 91. The heat amount of the exhaust gas 95 is constantly collected as electricity and can be used effectively regardless of the operating state of the vehicle and the engine. However, a dedicated cooling water circuit 92 is required to recover the amount of heat that cannot be converted into electricity by the thermoelectric elements, out of the amount of heat that passes through the thermoelectric generator unit 91, and the radiator 94 of the cooling circuit is installed in the engine room. For example, there is a problem that the ambient temperature in the engine room is increased. Also, by making the cooling side of the thermoelectric element air-cooled,
A structure in which a cooling circuit is not provided and the configuration is simplified (Japanese Unexamined Patent Publication No.
No. 2538), there is a sufficiently large temperature difference between the high-temperature side and the low-temperature side of the thermoelectric element, but the temperature difference between the high-temperature section and the low-temperature section of the thermoelectric element itself is small. The energy that can be converted into electricity is small. In consideration of the above circumstances, the present invention provides a thermoelectric module including a thermoelectric element between an engine and an exhaust manifold, thereby reducing the amount of heat from exhaust gas without newly providing a cooling circuit dedicated to the thermoelectric element. It is intended to be collected as.

[0004]

In order to achieve the above object, a vehicle exhaust heat recovery apparatus according to the present invention comprises: an engine;
In a vehicle exhaust heat recovery device in which a cylindrical thermoelectric module including a plurality of thermoelectric elements is interposed between an exhaust manifold that guides exhaust gas from the engine to a catalyst, a thermoelectric element constituting the thermoelectric module The high-temperature junction is provided on the end face of the thermoelectric module on the exhaust manifold side, and the low-temperature junction is provided on the engine-side end face, and the heterogeneous conductors constituting the thermoelectric module are installed in parallel with the exhaust gas flow direction. . The two types of thermoelectric elements constituting the thermoelectric module are alternately arranged from the inside to the outside of the cylindrical shape, and the end of the innermost first thermoelectric element on the exhaust manifold side is the first thermoelectric element. A high-temperature junction is formed by connecting the end of a different type of second thermoelectric element disposed outside the element with a conductive member, and the second thermoelectric element and the second thermoelectric element are disposed outside the second thermoelectric element. A low-temperature junction is formed by connecting the engine-side end faces of the third thermoelectric element of the same type as the first thermoelectric element with a conductive member, from the innermost thermoelectric element to the outermost thermoelectric element, The thermoelectric elements are connected in series via a conductive member, the gaps between the thermoelectric elements are filled with an insulating member having high heat insulating properties, and the inside and outside of the thermoelectric module are formed of reinforcing members. Further, an electrode is connected to the engine-side end of the innermost thermoelectric element and the outermost thermoelectric element of the thermoelectric module, and the thermoelectric module is composed of a plurality of blocks having electrodes at both ends, and each block is The electrodes from are connected in parallel. The invention according to claim 4, wherein the thermoelectric module alone has a shape in which the low-temperature bonding portions of the thermoelectric elements arranged alternately project toward the engine outside the reinforcing member with respect to the axial direction of the thermoelectric module. The thermoelectric element outside each of the two thermoelectric elements formed outside of the reinforcing member is formed at the same position in the axial direction as the reinforcing member, and the conductive member forming the high-temperature bonding portion The insulating member filled in the gap between the thermoelectric element and the elastic element has elasticity, and the high-temperature joint is attached to the exhaust manifold surface and the low-temperature joint is attached to the engine in a state of being mounted between the engine and the exhaust manifold. It is characterized by being in contact via a gasket.
The invention according to claim 5, wherein the reinforcing member has an axial length shorter than a combined length of the thermoelectric element and the conductive member, and is formed between the engine and the exhaust manifold. A gasket is interposed in a gap between the exhaust manifold and the exhaust manifold, and the thermoelectric module is connected to the engine and the exhaust manifold via an insulating member. The invention according to claim 6, wherein each of the thermoelectric elements constituting the thermoelectric module has a shape spreading radially inward from the inside of the thermoelectric module to the outside, and two types of thermoelectric elements are alternately arranged in the circumferential direction. It is characterized by.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 2 is a view showing a state in which an exhaust heat recovery device for a vehicle according to Embodiment 1 of the present invention is mounted between an engine 1 and an exhaust manifold 2, and FIG.
FIG. 2 is a cross-sectional view illustrating a thermoelectric module 3 according to the first embodiment. FIG. 1 is a sectional view taken along line BB of FIG. The thermoelectric module 3 is mounted between the engine 1 and the exhaust manifold 2 via an insulating non-metallic gasket (not shown). The thermoelectric module 3
A plurality of thermoelectric elements 4 (4a, 4b, 4) made of a p-type semiconductor and an n-type semiconductor have a cylindrical shape as a whole.
c, 4d), each thermoelectric element 4a, 4b, 4
c, 4d, as shown in FIG. 3, the fan shape cut into a plurality when viewed in a cross section obtained by cutting the thermoelectric module 3 into circles.
Two types of thermoelectric elements are alternately arranged from the inside to the outside of the thermoelectric module 3 so as to be parallel to the flow direction of the exhaust gas in the cylindrical axial direction. Therefore, each of the thermoelectric elements 4a, 4b, 4c, and 4d has a thin cylindrical shape and is divided into a plurality of sections as viewed in a cross section.

A first thermoelectric element 4a at the innermost side in the thermoelectric module 3 and a second thermoelectric element formed of a semiconductor different in type from the first thermoelectric element 4a disposed outside the first thermoelectric element 4a. The end face of the exhaust manifold 4b on the exhaust manifold 2 side is connected by a conductive member, and a high-temperature joining portion 5 is formed. A third thermoelectric element 4c formed of the same semiconductor as the first thermoelectric element 4a installed outside the second thermoelectric element 4b,
The end surface of the second thermoelectric element 4b on the engine 1 side is connected by a conductive member, and a low-temperature joint 6 is formed. The end faces of the second thermoelectric element 4b and the third thermoelectric element 4c on the exhaust manifold 3 side are electrically insulated. Third
The end faces of the thermoelectric element 4c and the outermost thermoelectric element 4d on the exhaust manifold 3 side are connected by a conductive member, and a high-temperature bonding portion 5 is formed.

As described above, from the first thermoelectric element 4a inside the thermoelectric module 3 to the fourth thermoelectric element 4d outside,
Electrodes 9 (9a, 9b) are connected to the engine 1 side end surfaces of the inner thermoelectric element 4a and the outer thermoelectric element 4d. For this reason, the thermoelectric element 4a near the exhaust gas passage of the thermoelectric module 3 and the outermost thermoelectric element 4d have a structure in which the high-temperature bonding portion 5 is provided on the exhaust manifold 2 side.

Further, each of the thermoelectric elements 4a, 4b, 4c, 4
The gap d is filled with a heat-insulating insulating member 10,
Reinforcing members 7 and 8 are installed inside and outside the thermoelectric module 3. For this reason, the exhaust gas is not directly exposed to the insulating member 10 or the thermoelectric elements 4a, 4b, 4c, and 4d. The thermoelectric module 3 has electrodes 9a at both ends,
9b, each electrode 9a,
9b are electrically connected in parallel.

Next, the operation of the vehicle exhaust recovery apparatus according to this embodiment will be described. First, exhaust manifold 2
The heat transfer from the engine to the engine 1 will be described. Except immediately after starting the engine, the temperature of the entire engine 1 is governed by the temperatures of the cooling water and the lubricating oil during the general running of the vehicle.
Except for the internal combustion chamber, the temperature is maintained at approximately 80 to 130 ° C. irrespective of the operating state of the engine 1. On the other hand, due to the exhaust gas flowing inside, the surface of the exhaust manifold 2 changes depending on the operating state of the engine 1, but reaches a high temperature of about 300 to 800 ° C. Therefore, part of the heat amount of the exhaust manifold 2 heated by the exhaust gas moves toward the engine 1, and the heat amount moved to the engine 1 is absorbed by the cooling water of the water jacket in the engine 1, and finally Is radiated to the outside by a radiator.

In the exhaust heat recovery apparatus of the present embodiment, each of the thermoelectric elements 4a, 4b, 4c,
4d is installed from the engine 1 to the exhaust manifold 2 side so as to be parallel to the flow of the exhaust gas. Therefore, the heat flow from the exhaust manifold 2 to the engine 1 is reduced by the thermoelectric elements 4a, 4b, 4c, and 4c. It passes in the length direction of 4d. At this time, the high-temperature bonding portion 5 formed by bonding the first thermoelectric element 4a and the second thermoelectric element 4b with a conductive member, the second thermoelectric element 4b, and the third thermoelectric element 4b
and a low-temperature joining portion 6 formed by joining the first and second members with an electrically conductive member.
Are located on the exhaust manifold 2 side and the engine 1 side, respectively, so that the high-temperature joint 5 becomes hot due to the amount of heat from the exhaust manifold 2, and the low-temperature joint 6 absorbs heat in the engine 1. Therefore, the temperature is lower than that of the high-temperature bonding portion 5.

Therefore, each of the thermoelectric elements 4a, 4b, 4c,
4d is to generate an electromotive force due to a temperature difference (temperature gradient) between the high-temperature bonding portion 5 and the low-temperature bonding portion 6, generate a potential difference between the electrode 9a and the electrode 9b, and convert the calorific value into electricity to collect. Can be. At this time, the thermoelectric elements 4a, 4b, 4c, 4
Since d is connected in series, it is possible to obtain a potential difference larger than the potential difference generated between the set of the high-temperature junction 5 and the low-temperature junction 6. It is clear that the potential difference obtained increases as the number of combinations of the high-temperature junction 5 and the low-temperature junction 6 increases.

At this time, each of the thermoelectric elements 4a, 4b, 4c, 4d of the thermoelectric module 3 and the joints 5, 6 formed by the conductive members.
Other than the above, since it is filled with a heat insulating insulating member 10,
The thermoelectric elements 4a, 4b, 4c, 4d do not conduct except at the junctions 5, 6 formed by the conductive members. Also, the two high-temperature joints 5 shown in FIG. 1 and the thermoelectric elements 4a, 4
The three or more high-temperature joints 5 and the plurality of low-temperature joints 6 generated by increasing b, 4c, and 4d are connected to the exhaust manifold 2 and the engine 1 with an insulating nonmetallic gasket (not shown). Since they are attached, the plurality of high-temperature joints 5 and the low-temperature joints 6 do not conduct with each other.

Accordingly, the conduction of the thermoelectric elements 4a, 4b, 4c, 4d other than the junctions 5, 6 and the reduction of the electromotive force due to the conduction between the junctions 5, 6 are reduced.
A decrease in the potential difference between the electrodes 9b is suppressed, and a decrease in the thermoelectric conversion efficiency is prevented.

Each of the thermoelectric elements 4a, 4b, 4c, 4d
Of the joints 5 and 6, a heat insulating layer due to gaps between the joints 5 and 6 and a gasket (not shown), the insulating member 1
0 each thermoelectric element 4a, 4b, 4
When conduction occurs between c and 4d, the thermoelectric conversion efficiency of the entire thermoelectric module 3 is greatly reduced. However, in the exhaust heat recovery device according to the present embodiment, the thermoelectric module 3
Divided into a plurality of blocks having electrodes 9a and 9b at both ends,
Since the electrodes 9a and 9b are electrically connected in parallel, a decrease in thermoelectric conversion efficiency in any block does not significantly reduce the thermoelectric conversion efficiency of the entire thermoelectric module 3. Furthermore, each thermoelectric element 4a, 4b,
The electrodes 9a and 9b from 4c and 4d are connected to the thermoelectric module 3
Electrode 9 is taken out from the engine 1 side.
a and 9b become high temperature and do not break.

Next, the amount of heat passing through the thermoelectric module 3 will be described. The thermoelectric conversion efficiency of the entire thermoelectric module 3 varies depending on the type of thermoelectric element used as each of the thermoelectric elements 4a, 4b, 4c, 4d, but is about 10 to 20%. Therefore, of the amount of heat passing through the thermoelectric module 3,
About 80% to 90% will be absorbed by the cooling side. For this reason, in order to increase the amount of power generation from the thermoelectric module 3, it is necessary to increase the amount of heat passing through the thermoelectric module 3. Circuit is required.
In general, a cooling circuit dedicated to the thermoelectric module 3 and a cooling circuit using cooling water of the engine 1 are provided. The amount of heat originally discharged as exhaust gas is converted into a cooling circuit dedicated to the thermoelectric module 3 and a cooling circuit of the engine 1. The radiator provided in the cooling circuit radiates heat to raise the ambient temperature in the engine room.

In the exhaust heat recovery apparatus according to the present embodiment, the thermoelectric element 4 (4a, 4b, 4c, 4d) is provided with a thermoelectric element so that the heat quantity passes through the thermoelectric element 4 (4a, 4b, 4c, 4d) to the portion where the heat quantity moves from the exhaust manifold 2 to the engine 1. Since the module 3 is installed, a part of the amount of heat transmitted from the exhaust manifold 2 to the engine 1 is recovered by the thermoelectric module 3 and converted into electricity when the conventional exhaust manifold 2 is mounted without the exhaust heat recovery device. Will do. Therefore, a new cooling circuit is not required, and the amount of heat transferred from the exhaust manifold 2 to the engine 1 is reduced, so that the amount of heat radiation from the radiator is reduced, the temperature of the engine cooling water is reduced, and the atmosphere in the engine room is reduced. The temperature drops. In terms of the heat balance of the cooling water of the engine 1, this means that a part of the amount of heat transmitted from the exhaust manifold 2 to the engine 1 and radiated from the radiator is converted into electricity. Is a different form of energy conversion.

(Embodiment 2) Next, a vehicle heat recovery apparatus according to Embodiment 2 will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals in the drawings, and redundant description will be omitted. The exhaust heat recovery device for a vehicle according to the present embodiment includes a thermoelectric module 3a before the thermoelectric module 3a constituting the exhaust heat recovery device is attached between the engine 1 and the exhaust manifold 2.
In a single state, the low-temperature joining portion 6 formed by the conductive members of the second thermoelectric element 4b and the third thermoelectric element 4c is moved in the direction parallel to the exhaust gas flow in the axial direction of the reinforcing members 7 and 8 of the thermoelectric module 3a. Are installed so as to protrude outward, and a high-temperature joining portion 5a formed by a conductive member of a first thermoelectric element 4a and a second thermoelectric element 4b, a third thermoelectric element 4c and a fourth thermoelectric element 4d, and a heat insulating member 10a Is a structure with an elastic member. The first thermoelectric element 4a and the outermost thermoelectric element, in FIG. 4, the fourth thermoelectric element 4d are installed at the same position in the axial direction as the reinforcing members 7, 8.

In this embodiment, when the thermoelectric module 3a is mounted between the engine 1 and the exhaust manifold 2, the high-temperature joint 5a and the insulating member 10a have elasticity. 1 and the thermoelectric elements 4b and 4c connected to the low-temperature joint 6 by the gasket (not shown) are pushed into the same position in the axial direction as the other thermoelectric elements 4a and 4d, and the same state as FIG. Become.

For this reason, the adhesion between the high-temperature joint 5a and the exhaust manifold 2 via the gasket is improved, and the low-temperature joint 6 also improves the adhesion between the engine 1 via the gasket. improves. Therefore, the thermal resistance from the exhaust manifold 2 to the high-temperature joint 5a and the thermal resistance from the low-temperature joint 6 to the engine 1 are reduced, and the heat flow at each contact is improved, and the exhaust gas in the exhaust gas passage is improved. Leakage to the outside is further suppressed.

(Embodiment 3) Next, an exhaust heat recovery apparatus for a vehicle according to Embodiment 3 will be described with reference to FIG. The same components as those in the first or second embodiment are denoted by the same reference numerals in the drawings, and redundant description will be omitted. The exhaust heat recovery device for a vehicle according to the present embodiment includes a thermoelectric module 3
b, the length of the reinforcing members 7a and 8a in the axial direction is set to be equal to each of the thermoelectric elements 4a and 4 including the high-temperature joint 5 and the low-temperature joint 6.
b, 4c, 4d, the length of the thermoelectric module 3b
A gasket 13 is attached to a gap generated when the gasket is attached between the engine 1 and the exhaust manifold 2, and the thermoelectric module 3 b is attached to the engine 1 and the exhaust manifold 2 via an insulating member.

In this embodiment, since there are no gaskets between the low-temperature joint 6 and the engine 1 and between the high-temperature joint 5 and the exhaust manifold 2, the thermoelectric module 3b, the engine 1 and the exhaust manifold 2 The gasket 13 can be used as the gasket 13 as well as the adhesion between them is improved. In addition, the thermoelectric module 3b and the exhaust manifold 2
The conductive member between the high-temperature bonding portions 5 is prevented by the insulating member between the high-temperature bonding portions 5 and 6. The operation of the thermoelectric module 3b is described in the first embodiment.
Is the same as

(Embodiment 4) Next, an exhaust heat recovery apparatus for a vehicle according to Embodiment 4 will be described with reference to FIG. The same components as those in the first to third embodiments are denoted by the same reference numerals in the drawings, and redundant description will be omitted. The exhaust heat recovery device for a vehicle according to the present embodiment includes a thermoelectric module 3c.
Each of the thermoelectric elements 4a, 4b, 4c, and 4d has only one stage in the radial direction, and has a shape that spreads radially from the inside to the outside of the thermoelectric module 3c. Are arranged alternately in the direction, and on the exhaust manifold 2 side, high-temperature joints for connecting adjacent thermoelectric elements 4b and 4c with conductive members are provided, and the respective thermoelectric elements 4b and 4c are provided.
A low-temperature junction is provided on the engine 1 side of the adjacent thermoelectric elements 4a and 4d on the opposite side of the
The gap between a, 4b, 4c and 4d is filled with an insulating member 10b. The operation of the present embodiment is the same as that of the first embodiment.

[0023]

According to the present invention having the above-described structure, the high-temperature junction forming the thermoelectric module is formed on the exhaust manifold side and the low-temperature junction is formed on the engine side, so that the temperature between the exhaust manifold and the engine is reduced. Because a large amount of heat passes through the thermoelectric module due to the difference, the thermoelectric conversion efficiency of the thermoelectric element is improved. In addition, since the low-temperature junction was formed on the engine side, the amount of heat that passed through the thermoelectric module and was not recovered by the thermoelectric element was recovered by the cooling water in the water jacket in the engine.
Exhaust heat can be recovered without installing a new cooling circuit at the low-temperature junction. In addition, since the low-temperature joint and the high-temperature joint of the thermoelectric module and the reinforcing member have a step, and a gasket is mounted at the step,
Because the low-temperature joint is outside the reinforcing member and the high-temperature joint is inside the reinforcing member, it is possible to prevent the exhaust gas flowing inside the thermoelectric module from leaking to the outside with the thermoelectric module installed. it can.

[Brief description of the drawings]

FIG. 1 is a view showing a thermoelectric module according to Embodiment 1 of the present invention, and is a cross-sectional view taken along line BB of FIG.

FIG. 2 is a schematic diagram showing a state in which the exhaust heat recovery device for a vehicle according to the first embodiment is mounted between an engine and an exhaust manifold.

FIG. 3 is a view showing the thermoelectric module according to the first embodiment, and is a cross-sectional view taken along line AA of FIG. 2;

FIG. 4 is a diagram showing a thermoelectric module according to a second embodiment.

FIG. 5 is a diagram showing a thermoelectric module according to a third embodiment.

FIG. 6 is a diagram illustrating a thermoelectric module according to a fourth embodiment.

FIG. 7 is a diagram showing a conventional example.

FIG. 8 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Exhaust manifold 3 Thermoelectric module 3a Thermoelectric module 3b Thermoelectric module 3c Thermoelectric module 4 Thermoelectric element 4a First thermoelectric element 4b Second thermoelectric element 4c Third thermoelectric element 4d Fourth thermoelectric element 5 High temperature junction 5a High temperature junction 6 Low temperature Joint 7 Reinforcement member 7a Reinforcement member 8 Reinforcement member 8b Reinforcement member 9 Electrode 9a Electrode 9b Electrode 10 Insulation member 10a Insulation member 10b Insulation member 13 Gasket

Claims (6)

[Claims] An exhaust heat recovery device for a vehicle having a cylindrical thermoelectric module including a plurality of thermoelectric elements interposed between an engine and an exhaust manifold for guiding exhaust gas from the engine to a catalyst, The high-temperature junction of the thermoelectric elements constituting the thermoelectric module is provided on the exhaust manifold side end surface of the thermoelectric module, and the low-temperature junction is provided on the engine side end surface of the thermoelectric module. An exhaust heat recovery device for a vehicle, which is installed in a vehicle. 2. The exhaust heat recovery device for a vehicle according to claim 1, wherein the two types of thermoelectric elements constituting the thermoelectric module are alternately arranged from the inside to the outside of the cylindrical shape.
The end of the innermost first thermoelectric element on the exhaust manifold side is connected to the end of a different type of second thermoelectric element disposed outside of the first thermoelectric element by a conductive member to perform high-temperature bonding. A portion is formed, and the engine-side end faces of the second thermoelectric element and a third thermoelectric element of the same type as the first thermoelectric element disposed outside the second thermoelectric element are connected to each other by a conductive member. A low-temperature junction is formed, and the thermoelectric element is connected in series from the innermost thermoelectric element to the outermost thermoelectric element via a conductive member. An exhaust heat recovery device for a vehicle, wherein the inside and outside of the vehicle are constituted by reinforcing members. 3. The exhaust heat recovery device for a vehicle according to claim 1, wherein an electrode is connected to an engine-side end of the innermost thermoelectric element and an outermost thermoelectric element of the thermoelectric module. An exhaust heat recovery device for a vehicle, comprising a plurality of blocks having electrodes at both ends, and electrodes from each block being connected in parallel. 4. The exhaust heat recovery device for a vehicle according to claim 1, wherein the thermoelectric module is configured such that a low-temperature joining portion of thermoelectric elements arranged alternately has the reinforcing member with respect to an axial direction of the thermoelectric module. Outer thermoelectric elements are formed in a shape protruding toward the engine on the outer side, and the outer thermoelectric elements of the two thermoelectric elements formed outside the reinforcing member are formed at the same position in the axial direction as the reinforcing member. The insulating member filled in the gap between the conductive member and the thermoelectric element forming the high-temperature joint has elasticity and is mounted between the engine and the exhaust manifold, and the high-temperature joint is disposed on the exhaust manifold surface. The low-temperature joints to the engine,
An exhaust heat recovery device for a vehicle, wherein the exhaust heat recovery devices contact each other via a gasket. 5. The exhaust heat recovery device for a vehicle according to claim 1, wherein the length of the reinforcing member in the axial direction is shorter than the combined length of the thermoelectric element and the conductive member, and between the engine and the exhaust manifold. A gasket is interposed in a gap between the reinforcing member and the engine and the exhaust manifold generated in a state of being attached to the vehicle, and the thermoelectric module is connected to the engine and the exhaust manifold via an insulating member. apparatus. 6. The exhaust heat recovery device for a vehicle according to claim 1, wherein each of the thermoelectric elements constituting the thermoelectric module has a shape that spreads radially from the inside to the outside of the thermoelectric module.
An exhaust heat recovery device for a vehicle, wherein two types of thermoelectric elements are alternately arranged in a circumferential direction.