JP6689230B2 - Exhaust heat recovery device - Google Patents

Description

  The present invention relates to an exhaust heat recovery device that exchanges heat with the heat of exhaust gas.

  There is known an exhaust heat recovery device that warms cooling water by the heat of exhaust gas generated by an engine while a vehicle is traveling. As an exhaust heat recovery device, for example, there is a technique disclosed in Patent Document 1.

  Reference is made to FIGS. 8 (a) and 8 (b). FIGS. 8 (a) and 8 (b) are the same as FIGS. 2 (a) and 4 of Patent Document 1, but are renumbered. The exhaust heat recovery apparatus 100 includes a branch part 101 capable of branching exhaust gas into two flow paths, a first flow path 102 extending from the branch part 101, and a branch part 101 to a first flow path 102. A second flow path 103 extending along the heat exchanger 104, a heat exchanger 104 provided in the second flow path 103, a first pipe 105 for introducing cooling water into the heat exchanger 104, A connecting portion 106 attached to the heat exchanger 104, a second pipe 107 connected to the connecting portion 106 for discharging cooling water, and a thermoactuator 108 connected to the connecting portion 106 and operating according to the temperature of the cooling water. And a valve 109 that opens and closes the first flow path 102 by the thermoactuator 108, and a merging section 110 that merges the exhaust gas that has passed through the first flow path 102 and the second flow path 103.

JP, 2011-231714, A

  Reference is made to FIG. The arrangement of the connection unit 106, the thermoactuator 108, and the second pipe 107 will be described. The connection part 106 is attached to the upper surface part 104 a of the heat exchanger 104. The thermoactuator 108 is inserted into the insertion hole 106a formed in the side surface of the connection portion 106. The outlet 106b is located above the insertion hole 106a. One end portion 107a of the second pipe 107 is fitted in the discharge port 106b. That is, the heat exchanger 104, the thermoactuator 108, and the second pipe 107 are arranged in a superposed manner. Therefore, the height of the exhaust heat recovery device 100 becomes high.

  Reference is made to FIG. A heat exchanger 104 and a thermoactuator 108 are arranged on the second flow path 103 side (left side). Therefore, the center of gravity of the exhaust heat recovery device 100 is biased toward the second flow path 103 side. The exhaust heat recovery device 100 is connected to the exhaust pipe at the branch portion 101 and the confluence portion 110. Therefore, the center of gravity is preferably coaxial with the exhaust pipe. When the center of gravity is deviated, the influence of vibration applied to the exhaust heat recovery device 100 becomes large while the vehicle is traveling.

  An object of the present invention is to provide an exhaust heat recovery device that is compact in the height direction and that suppresses the deviation of the center of gravity.

According to a first aspect of the present invention, there is provided a branch portion capable of branching exhaust gas into two flow passages, a first flow passage extending from the branch portion, and a portion extending from the branch portion along the first flow passage. A second flow path extending in the form of a heat exchanger, a heat exchanger provided in the second flow path for transferring heat from the exhaust gas to the cooling water, and a pipe connected to the heat exchanger and through which the cooling water flows. And a thermoactuator which is connected to the pipe and operates according to the temperature of the cooling water, and a valve which opens and closes the first flow path by the thermoactuator,
The thermoactuator and the heat exchanger provided in the second flow path are
In the height direction, it is arranged at a height overlapping the first flow path,
An exhaust heat recovery device is provided, which is arranged so as to sandwich the first flow path with reference to a plan view.

As described in claim 2, preferably, a flange is provided at one end of the pipe,
The flange is fixed to the heat exchanger via a fastening member.

  As described in claim 3, preferably, the flange is fixed to the upper surface of the heat exchanger, and is fixed so as to be inclined downwardly toward the thermoactuator.

As described in claim 4, preferably, the other end portion of the pipe is located upstream of the one end portion of the pipe with respect to the flow direction of the exhaust gas, and at the same time to the thermoactuator. Is connected .

  As described in claim 5, preferably, the pipe has a vibration absorbing portion or a thermal expansion absorbing portion.

  As described in claim 6, preferably, the thermoactuator is held by a holding member supported by the first flow path.

  As described in claim 7, preferably, the first flow path has a heat insulating structure portion that suppresses heat of the exhaust gas from being transferred to the outside.

As described in claim 8, preferably, the heat insulating structure is constituted by a double pipe in which a peripheral edge of an inner pipe is surrounded by an outer pipe with a space therebetween,
Only one end of the inner pipe is connected to the outer pipe and the other end is a free end.

  In the invention according to claim 1, the thermoactuator and the second flow passage are arranged at a height overlapping the first flow passage in the height direction, and the first actuator is provided with reference to the plan view. It is arranged so as to sandwich the flow path. That is, the thermoactuator, the first flow path, and the second flow path are arranged horizontally. Therefore, the exhaust heat recovery device can be made compact in the height direction.

  In addition, it can be said that the heat exchanger is arranged on one side and the thermoactuator is arranged on the other side with respect to the first flow path. Since the heat exchangers and the thermoactuators through which the medium flows are dispersed, the center of gravity of the entire exhaust heat recovery apparatus is less likely to be biased. The torsion due to vibration can be suppressed, and the strength of the exhaust heat recovery device can be increased.

  In addition, it can be said that the first flow path is arranged between the thermoactuator and the heat exchanger. A predetermined space is maintained between the thermoactuator and the heat exchanger. The degree of freedom in the layout of the piping that connects the thermoactuator and the heat exchanger is increased, and the angle of bending of the piping can be reduced. As a result, the pressure loss of the cooling water flowing inside the pipe can be suppressed, and the load on the pump for flowing the cooling water is also reduced.

  In the invention according to claim 2, a flange is provided at one end of the pipe, and the flange is fixed to the heat exchanger via a fastening member. Therefore, the pipe can be attached to and detached from the heat exchanger, and the maintainability of the exhaust heat recovery device is improved. In addition, since the pipe is fixed via the fastening member, the alignment at the time of assembly becomes easy.

  In the invention according to claim 3, the flange is fixed to the upper surface of the heat exchanger, and is fixed so as to be inclined downwardly toward the thermoactuator. That is, one end of the pipe is fixed so that the axis of the one end of the pipe inclines toward the thermoactuator. Therefore, the bending angle of the pipe can be reduced by the angle of inclination of the flange. As a result, the height of the pipe can be made compact.

  In the invention according to claim 4, the other end of the pipe is located on the upstream side of the one end with respect to the exhaust gas flow direction (front-back direction). If the other end of the pipe were located on the side of the one end, the thermoactuator would have to be arranged further downstream. The length of the exhaust heat recovery device becomes long in the flow direction of the exhaust gas. On the other hand, if the other end is located on the upstream side, the exhaust heat recovery device can be made compact in the exhaust gas flow direction.

  In the invention according to claim 5, the pipe has a vibration absorbing portion or a thermal expansion absorbing portion. Vibration during engine operation or running is absorbed, and thermal expansion displacement between the first flow path and the second flow path due to heat of exhaust gas can be absorbed, so that the life of the exhaust heat recovery device is extended.

  In the invention according to claim 6, the thermoactuator is held by the holding member supported by the first flow path. Therefore, the thermoactuator is held more reliably. The attachment of the holding member is required not to impair the function of the component to which it is attached. Exhaust gas and cooling water flow inside the heat exchanger. On the other hand, only the exhaust gas flows through the first flow path. Therefore, as compared with a heat exchanger that requires more attention when attaching the holding member, attachment to the first flow path becomes easier.

  In the invention according to claim 7, the first flow path has a heat insulating structure that suppresses the heat of the exhaust gas from being transferred to the outside. Therefore, it becomes difficult for the radiant heat from the first flow path to be transmitted to the holding member attached to the first flow path, the thermoactuator held by the holding member, and the heat exchanger adjacent to the first flow path. Can suppress the influence of. In addition, it can be said that the heat insulating structure reduces heat radiation from the first flow path. Therefore, the efficiency of heat exchange is increased.

  In the invention according to claim 8, the heat insulating structure is constituted by a double pipe, and the inner pipe has only one end connected to the outer pipe and the other end being a free end. The space between the inner pipe and the outer pipe can suppress the heat of the exhaust gas from being transferred to the outer pipe. Therefore, it is possible to prevent the outer tube from expanding due to the heat of the exhaust gas. Further, since the other end of the inner pipe is a free end, it is possible to reduce the stress that can occur when the inner pipe is stretched by the heat of the exhaust gas. As a result, the life of the exhaust heat recovery device can be extended.

1 is a perspective view of an exhaust heat recovery device according to an embodiment of the present invention. FIG. 2 is a plan view of the exhaust heat recovery device shown in FIG. 1. FIG. 2 is a right side view of the exhaust heat recovery device shown in FIG. 1. It is a front view of the exhaust heat recovery apparatus shown in FIG. It is a principal part enlarged view of the exhaust heat recovery apparatus shown in FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. 2. It is a figure explaining the exhaust heat recovery apparatus by the modification of this invention. It is a figure explaining the exhaust heat recovery apparatus by a prior art.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure, Fr is front, Rr is rear, L is left, R is right, Up is up, and Dn is down.
<Example>

  Please refer to FIG. FIG. 1 shows an exhaust heat recovery device 10 mounted on a vehicle. The exhaust heat recovery device 10 warms the cooling water by the heat of the exhaust gas generated by the engine.

  Please refer to FIG. 1 to FIG. The exhaust heat recovery device 10 includes a branch portion 11 that can branch exhaust gas introduced from the engine into two flow paths, a first flow path 20 extending from the branch portion 11, and a first flow path from the branch portion 11 to the first flow path 20. Second flow passage 30 extending along the flow passage 20, the heat exchanger 31 provided in the second flow passage 30, and the first heat exchanger 31 for introducing cooling water. Pipe 40, a second pipe 50 (pipe 50) for discharging the cooling water from the heat exchanger 31, a thermoactuator 60 connected to the second pipe 50 and operating according to the temperature of the cooling water, and a thermo A third pipe 70 that discharges cooling water from the actuator 60, a valve 12 that opens and closes the first flow path 20 by the thermoactuator 60, a valve chamber 13 that houses this valve 12, and a valve chamber 13 are connected. First flow path 20 and second Has a merging portion 14 where the exhaust gas passing through the flow path 30 are merged, the.

  The branch portion 11 includes a box-shaped main body 17 and a lid 18 that covers the main body 17. The lid 18 is formed with an inlet 18a through which exhaust gas is introduced. The main body portion 17 is formed with a first outlet 17a connected to the first flow passage 20 and a second outlet 17b connected to the second flow passage 30.

  The second flow path 30 has a connecting portion 32 that connects the rear end of the heat exchanger 31 and the merging portion 14. It can be said that the heat exchanger 31 constitutes a part of the second flow path 30.

  Next, the operation of the exhaust heat recovery device 10 will be described.

  When the cooling water circulated by the pump P (see FIG. 2) is lower than the predetermined temperature, the valve 12 provided downstream of the first flow path 20 is closed. Therefore, the exhaust gas introduced into the branch portion 11 passes through the second outlet 17b and flows into the heat exchanger 31. Cooling water flows into the heat exchanger 31 through the first pipe 40. The heat of the exhaust gas flowing into the heat exchanger 31 is transferred to the cooling water, and the cooling water is warmed. The heated cooling water passes through the second pipe 50 and flows into the thermo actuator 60.

  When the cooling water reaches a predetermined temperature, the wax filled in the thermo actuator 60 expands and the rod 61 advances. The rod 61 that has advanced advances the valve 12 by a crank mechanism (see FIG. 6). When the valve 12 is opened, the first flow path 20 is opened, and the exhaust gas passes through the first flow path 20. The first flow path 20 is located immediately after the introduction port 18a. Therefore, most of the exhaust gas passes through the first flow path 20.

  Then, when the cooling water falls below the predetermined temperature again, the wax of the thermo actuator 60 contracts. The rod 61 moves forward by the urging force of the return spring housed in the thermo actuator 60. The rod 61 reversely rotates the valve 12, and the lower end of the first flow path 20 is closed. The exhaust gas again flows through the heat exchanger 31, and the transfer of heat from the exhaust gas to the cooling water is restarted. The direction of circulating the cooling water may be reversed.

  Next, the structure of the exhaust heat recovery apparatus 10 and the arrangement and shape of each component constituting the exhaust heat recovery apparatus 10 will be described.

  Please refer to FIG. 3 and FIG. The thermo actuator 60 is held by the stay 21 (holding member 21) supported by the first flow path 20. The details will be described below.

  A stay receiving portion 23 is provided in the first flow path 20. The stay 21 is fixed to the stay receiving portion 23 via two bolts 24, 24.

  The case 62 of the thermo actuator 60 has a cylindrical shape. The case 62 includes a case front portion 63 connected to the third pipe 70 and a case rear portion 64 located on the rod 61 side. A connection flange 63a is formed on the edge of the rear end of the case front portion 63. A connection flange 64a is formed on the front edge of the case rear portion 64. The connecting flanges 63a and 64a abut each other and are fixed by bolts 65 and 65.

  The upper portion 25 of the stay 21 is curved along the outer peripheral surface of the cylindrical case front portion 63. The case front portion 63 is fixed to the upper portion 25 of the stay 21 from the lower end portion 63b to the right side portion 63c (the lower right portion of the quadrant).

  Please refer to FIG. The thermo-actuator 60 and the heat exchanger 31 provided in the second flow passage 30 are arranged at a height overlapping the first flow passage 20 in the height direction.

  That is, most of the heat exchanger 31 is located between the upper end H1 and the lower end H2 of the first flow path 20 in the height direction. A part of the case 62 of the thermo actuator 60 is located between the upper end H1 and the lower end H2 in the height direction.

  The connecting flanges 63 a and 64 a are a part of the thermo actuator 60. That is, in the height direction, only the connecting flanges 63a and 64a of the case 62 may be arranged between the upper end H1 and the lower end H2.

  Please refer to FIG. The thermoactuator 60 and the heat exchanger 31 are arranged so as to sandwich the first flow path 20 with reference to the plan view. The front end 66 of the thermo actuator 60 is located rearward of the inlet port 18a of the branch portion 11.

  The heat exchanger 31 may be arranged in front of or behind the present embodiment. That is, it suffices that the thermoactuator 60 and the second flow path 30 are arranged so as to sandwich the first flow path 20 with reference to the plan view, and the heat exchange provided in the second flow path 30. The position of the container 31 may be moved back and forth.

  An outlet 51 (the other end 51) of the second pipe 50 is connected to the case front portion 63. The outlet 51 of the second pipe 50 is located in front of the inlet 52 (one end 52) (on the upstream side with respect to the exhaust gas flow direction).

  The second pipe 50 has a bellows portion 53 (vibration absorbing portion 53, thermal expansion absorbing portion 53) formed in a bellows shape.

  Please refer to FIG. 2 and FIG. A flange 54 is provided at the inlet 52 of the second pipe 50. The flange 54 is fixed to the heat exchanger 31 via bolts 55, 55 (fastening members 55, 55). The flange 54 has a substantially elliptical shape. The bolt 55 that fixes the flange 54 is located at the end portion of the flange 54 in the longitudinal direction (the major axis direction of the ellipse). The details will be described below.

  Please refer to FIG. An insertion port 56 is formed in the flange 54. The inlet 52 of the second pipe 50 is inserted into the insertion port 56 and welded. A cylindrical portion 36 extending upward is formed on the upper surface portion 35 of the heat exchanger 31. A flange receiving portion 57 that receives the flange 54 is fixed to the upper end of the tubular portion 36.

  The flange receiving portion 57 has the same size and shape as the flange 54. The flange receiving portion 57 is inclined so as to have a downward slope toward the thermo actuator 60 (see FIG. 4) (inclination angle θ). In the state where the flange 54 is fixed to the flange receiving portion 57, the flange 54 is inclined so as to have a downward slope toward the thermo actuator 60. That is, the axis L of the inlet 52 of the second pipe 50 is inclined toward the thermoactuator 60 (inclination angle θ).

  Please refer to FIG. The first flow path 20 has a heat insulating structure 80 that suppresses the heat of the exhaust gas from being transferred to the outside. The heat insulating structure 80 is composed of a double pipe in which the peripheral edge of an inner pipe 81 is surrounded by an outer pipe 82 with a space in between.

  The front end 83 (one end 83) of the inner pipe 81 is expanded in diameter and connected to the outer pipe 82. At the rear end 84 (the other end 84) of the inner pipe 81, a convex portion 85 protruding toward the outer pipe 82 is formed in the circumferential direction. The convex portion 85 and the inner peripheral surface 82a of the outer tube 82 are in contact with each other. That is, the rear end 84 is a free end.

  Next, the effect of the present invention will be described.

  Please refer to FIG. 2 and FIG. The thermo-actuator 60 and the heat exchanger 31 provided in the second flow path 30 are arranged at a height overlapping the first flow path 20 in the height direction, and based on a plan view, It is arranged so as to sandwich the first flow path 20. That is, the thermoactuator 60, the first flow path 20, and the heat exchanger 31 are arranged side by side in the horizontal direction. Therefore, the exhaust heat recovery device 10 can be made compact in the height direction.

  In addition, it can be said that the heat exchanger 31 is arranged on one side and the thermoactuator 60 is arranged on the other side with respect to the first flow path 20. Since the heat exchangers 31 and the thermoactuators 60 through which the medium flows are dispersedly arranged, the center of gravity of the exhaust heat recovery apparatus 10 is unlikely to be biased. Twisting due to vibration can be suppressed, and the strength of the exhaust heat recovery device 10 can be increased.

  In addition, it can be said that the first flow path 20 is arranged between the thermo actuator 60 and the heat exchanger 31. A predetermined space is maintained between the thermo actuator 60 and the heat exchanger 31. The degree of freedom in the layout of the second pipe 50 that connects the thermo actuator 60 and the heat exchanger 31 is increased, and the bending angle of the second pipe 50 can be reduced. As a result, the load on the pump P that flows the cooling water is also reduced.

  Please refer to FIG. In addition, the outlet 51 of the second pipe 50 is located in front of the inlet 52 (upstream from the exhaust gas flow direction). If the outlet 51 of the second pipe 50 is located on the side of the inlet 52, the thermoactuator 60 has to be arranged further rearward. The length of the exhaust heat recovery device 10 becomes longer in the front-back direction (exhaust gas flow direction). On the other hand, if the outlet 51 is located in front of the inlet 52, the exhaust heat recovery device 10 can be made compact in the front-rear direction.

  In addition, the second pipe 50 has a bellows portion 53 formed in a bellows shape. Vibration during engine operation or running is absorbed, and thermal expansion displacement between the first flow path 20 and the second flow path 30 can be absorbed, so that the life of the exhaust heat recovery device 10 is extended.

  Please refer to FIG. 3 and FIG. The thermoactuator 60 is held by the stay 21 supported by the first flow path 20. Therefore, the thermo actuator 60 is more reliably held. The attachment of the stay 21 is required not to impair the function of the component to which it is attached. Exhaust gas and cooling water flow inside the heat exchanger 31. On the other hand, only the exhaust gas flows through the first flow path 20. Compared to the heat exchanger 31 that requires more attention when attaching the stay 21, the attachment to the first flow path 20 becomes easier.

  Please refer to FIG. 4 and FIG. A flange 54 is provided at the inlet of the second pipe 50. The flange 54 is fixed to the heat exchanger 31 via bolts 55, 55. Therefore, the second pipe 50 can be attached to and detached from the heat exchanger 31, and the maintainability of the exhaust heat recovery device 10 is improved. In addition, the second pipe 50 is fixed via the bolts 55, 55, which facilitates the alignment during assembly.

  In addition, the flange receiving portion 57 is inclined toward the thermo actuator 60 so as to have a downward slope (inclination angle θ). That is, the axis L of the inlet 52 of the second pipe 50 is inclined toward the thermoactuator 60 (inclination angle θ). Therefore, the bending angle of the second pipe 50 can be reduced by the amount of the inclination angle θ. As a result, the height of the second pipe 50 can be made compact.

  Please refer to FIG. The first flow path 20 has a heat insulating structure 80 that suppresses the heat of the exhaust gas from being transferred to the outside. Therefore, the radiant heat of the first flow path 20 is transmitted to the stay 21 attached to the first flow path 20, the thermoactuator 60 held by the stay 21, and the heat exchanger 31 adjacent to the first flow path 20. It becomes difficult and the influence of heat can be suppressed. It can be said that the heat insulating structure 80 reduces heat radiation from the first flow path 20. Therefore, the efficiency of heat exchange is increased.

  In addition, the heat insulating structure 80 is composed of a double pipe. Therefore, the heat of the exhaust gas can be prevented from being transferred to the outer pipe 82 by the space between the inner pipe 81 and the outer pipe 82.

  In addition, the front end 83 of the inner pipe 81 is connected to the outer pipe 82. On the other hand, the rear end 84 is a free end. Therefore, it is possible to suppress the extension of the outer pipe 82 due to the heat of the exhaust gas. Further, since the rear end 84 of the inner pipe 81 is a free end, it is possible to reduce the stress that may occur when the inner pipe 81 extends due to the heat of the exhaust gas. As a result, the life of the exhaust heat recovery device 10 can be extended.

  Please refer to FIG. Next, a modified example of the present invention will be described.

  The exhaust heat recovery device 10A according to the modification is different from the exhaust heat recovery device 10 according to the embodiment in the heat insulating structure 80A and the flange 54A. Other configurations are similar to those of the exhaust heat recovery device 10, and the reference numerals are used and the description thereof is omitted.

  Reference is made to FIG. Unlike the inner tube 81 (see FIG. 6), the inner tube 81A does not have the convex portion 85. An annular mesh 88 is provided between the outer peripheral surface 86 of the rear end 84A of the inner tube 81A and the inner peripheral surface 87 of the rear end 82a of the outer tube 82. Note that a plurality of meshes may be intermittently arranged in a ring shape.

  Reference is made to FIG. The flange 54A has a substantially rectangular shape. The flange 54A is formed with a first insertion port 58 into which the outlet of the first pipe 40 is inserted and a second insertion port 59 into which the inlet of the second pipe 50 is inserted.

  The front end of the left end, the rear end of the left end, and the central part of the right end of the flange 54A are fixed to the upper surface portion 35 of the heat exchanger 31 by three bolts 26. That is, the three bolts 26 are arranged in a triangular shape.

  The exhaust heat recovery device 10A has the following effects in addition to the predetermined effects of the present invention.

  Reference is made to FIG. Unlike the inner pipe 81 (see FIG. 6) of the embodiment, the inner pipe 81A does not require the processing of the convex portion 85.

  Reference is made to FIG. Not only the second pipe 50 but also the first pipe 40 can be attached to and detached from the heat exchanger 31. Therefore, the maintainability of the exhaust heat recovery device 10 is improved. In addition, the first pipe 40 and the second pipe 50 are attached to one flange 54A. Therefore, the number of parts does not increase.

  Although the exhaust heat recovery system of the present invention is applied to a four-wheeled vehicle in the embodiment, it is applicable to all vehicles and may be used for purposes other than the vehicle. That is, the present invention is not limited to the examples as long as the actions and effects of the present invention are exhibited.

  The exhaust heat recovery device of the present invention is suitable for a four-wheeled vehicle.

10 ... Exhaust heat recovery device 12 ... Valve 20 ... First flow path 21 ... Stay (holding member)
23 ... Stay receiving part 24 ... Bolt 25 ... Upper part 30 ... 2nd flow path 31 ... Heat exchanger 40 ... 1st piping 50 ... 2nd piping 51 ... Exit 52 ... Inlet 53 ... Bellows part 54 ... Flange 55 ... Bolt 56 ... Slot 57 ... Flange receiving portion 58 ... First slot 59 ... Second slot 60 ... Thermoactuator 62 ... Case 63 ... Case front part, 63a ... Connection flange 64 ... Case rear part, 64a ... Connection flange 80 ... Thermal insulation structure 81 ... Inner tube 82 ... Outer tube 83 ... Front end 84 ... Rear end 85 ... Convex portion 86 ... Outer peripheral surface 87 ... Inner peripheral surface 88 ... Mesh

Claims (8)

A branch portion capable of branching the exhaust gas into two flow paths, a first flow path extending from the branch portion, and a second flow path extending from the branch portion along the first flow path. A flow passage, a heat exchanger provided in the second flow passage for transferring heat from the exhaust gas to the cooling water, a pipe connected to the heat exchanger, through which the cooling water flows, and a pipe connected to the pipe. In an exhaust heat recovery device having a thermoactuator that operates according to the temperature of cooling water and a valve that opens and closes the first flow path by the thermoactuator,
The thermoactuator and the heat exchanger provided in the second flow path are
In the height direction, it is arranged at a height overlapping the first flow path,
The exhaust heat recovery device is arranged so as to sandwich the first flow path with reference to a plan view. A flange is provided at one end of the pipe,
The exhaust heat recovery device according to claim 1, wherein the flange is fixed to the heat exchanger via a fastening member.   The exhaust heat recovery device according to claim 2, wherein the flange is fixed to an upper surface of the heat exchanger and is inclined and fixed so as to have a downward slope toward the thermoactuator.   The other end of the pipe is located upstream of the one end of the pipe with respect to the flow direction of the exhaust gas, and is connected to the thermoactuator. The exhaust heat recovery device according to claim 2 or claim 3.   The exhaust heat recovery device according to any one of claims 1 to 4, wherein the pipe has a vibration absorbing portion or a thermal expansion absorbing portion.   The exhaust heat recovery device according to any one of claims 1 to 5, wherein the thermoactuator is held by a holding member supported by the first flow path.   The exhaust heat recovery device according to any one of claims 1 to 6, wherein the first flow path has a heat insulating structure that suppresses the heat of the exhaust gas from being transferred to the outside. The heat insulating structure is composed of a double tube in which the peripheral edge of the inner tube is surrounded by an outer tube through a space,
The exhaust heat recovery device according to claim 7, wherein only one end of the inner pipe is connected to the outer pipe and the other end is a free end.

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