JP7021026B2 - Exhaust heat recovery device - Google Patents

Description

The present disclosure relates to an exhaust heat recovery device.

Exhaust heat recovery devices that recover the heat of exhaust gas in an internal combustion engine for automobiles with cooling water are known. The exhaust heat recovery device is provided in the exhaust gas discharge flow path. The exhaust heat recovered by the cooling water in the exhaust heat recovery device is used for heating the inside of the vehicle, warming up the internal combustion engine, and the like.

In such an exhaust heat recovery device, a valve for adjusting the amount of exhaust gas supplied to the heat exchange section of the exhaust heat recovery device is provided in order to adjust the amount of exhaust gas recovery according to the temperature of the exhaust gas. Is known (see Patent Document 1).

The valve is opened and closed by a thermoactuator that operates according to the temperature of the cooling water. The thermoactuator opens and closes a valve by expanding and contracting a thermal expansion body such as wax.

Japanese Unexamined Patent Publication No. 2010-31669

In a general internal combustion engine, when the internal combustion engine is stopped, the circulation of cooling water is also stopped. Therefore, when the internal combustion engine is stopped while the temperature of the exhaust gas is high due to an operation such as idling stop, the cooling water in the exhaust heat recovery device receives heat from peripheral parts and the atmosphere, and water vapor is generated in the exhaust heat recovery device. do.

If this water vapor stays in contact with resin parts such as the thermal expander and sealer of the thermoactuator in the exhaust heat recovery device, these resin members may be melted or deteriorated due to heat damage due to high heat. There is. As a result, malfunction of the thermoactuator may occur.

One aspect of the present disclosure is an object of the present invention to provide an exhaust heat recovery device capable of suppressing heat damage to a thermoactuator due to water vapor.

One aspect of the present disclosure is a heat exchange unit that exchanges heat between the exhaust gas of the internal combustion engine and the cooling water, a valve that adjusts the supply amount of the exhaust gas to the heat exchange unit, and expansion and contraction by the heat of the cooling water. A thermoactor having a heat expansion part, a casing for accommodating the heat expansion part, a sealant for sealing between the heat expansion part and the casing, and an output part for opening and closing the valve by expanding and contracting the heat expansion part, and cooling water. It is an exhaust heat recovery device including a first water passage port and a second water passage port constituting both ends of the flow path of the above. The first water outlet is arranged below the thermoactuator. The uppermost portion of the inner surface of the pipe constituting the flow path of the cooling water from the thermoactuator to the second water passage port is located above the thermal expansion portion and the sealing body.

According to such a configuration, the water vapor generated in the exhaust heat recovery device does not stay in the region where it can come into contact with the thermal expansion part and the sealing body, but flows upward due to the difference in specific gravity with water, and the second It is discharged to the outside from the water passage. Therefore, it is possible to suppress heat damage to the thermoactuator due to water vapor.

One aspect of the present disclosure may include a space capable of storing gas between the thermoactuator in the flow path of the cooling water and the first water passage port. According to such a configuration, water vapor can be retained in a space that does not come into contact with the thermal expansion portion and the sealing body, and then the water vapor that overflows from this space can be discharged from the second water passage port. Therefore, it is possible to more stably suppress heat damage to the thermoactuator due to water vapor.

In one aspect of the present disclosure, the heat exchange units are provided between the thermoactor in the cooling water flow path and the first water outlet, respectively, and the third water outlet and the fourth water outlet for circulating the cooling water to the heat exchange unit. It may have a water outlet. The fourth water outlet may be arranged closer to the thermoactuator than the third water outlet in the cooling water flow path, and may be located above the thermal expansion portion and the sealing body. According to such a configuration, it is possible to reduce the height dimension of the exhaust heat recovery device while suppressing heat damage to the thermoactuator due to water vapor.

In one aspect of the present disclosure, the heat exchange units are provided between the thermoactor in the cooling water flow path and the first water outlet, respectively, and the third water outlet and the fourth water outlet for circulating the cooling water to the heat exchange unit. It may have a water outlet. The fourth water outlet may be arranged closer to the thermoactuator than the third water outlet in the cooling water flow path and may be located above the third water outlet. With such a configuration, it is possible to improve the heat exchange efficiency in the exhaust heat recovery device while suppressing heat damage to the thermoactuator due to water vapor.

1A is a schematic front view of the exhaust heat recovery device of the embodiment, and FIG. 1B is a schematic view showing the positional relationship between the storage space P and the uppermost portion T2 of the sealing body 43 in FIG. 1A. FIG. 2 is a schematic perspective view of the exhaust heat recovery device of FIG. 1A. FIG. 3 is a schematic cut end view taken along the line III-III of FIG. FIG. 4 is a schematic cut end view taken along the line IV-IV of FIG. 5A-5G is a schematic diagram illustrating the positional relationship of each part in the exhaust heat recovery device different from FIG. 1A.

Hereinafter, embodiments to which the present disclosure has been applied will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
The exhaust heat recovery device 1 shown in FIGS. 1A, 1B and 2 is provided in the exhaust gas flow path of the internal combustion engine, and recovers the heat of the exhaust gas to the cooling water. Examples of the internal combustion engine provided with the exhaust heat recovery device 1 include a gasoline engine or a diesel engine used in an automobile.

The exhaust heat recovery device 1 includes a heat exchange unit 2, a valve 3, a thermoactuator 4, a first water outlet 5, a second water outlet 6, a third water outlet 7, and a fourth water outlet 8. A first pipe 10, a second pipe 11, and a third pipe 12 are provided.

<Water outlet>
The first water passage port 5 is an inlet of the cooling water C in the exhaust heat recovery device 1 in the present embodiment. The first water passage port 5 is provided at the end of the first pipe 10. A hose for supplying cooling water is connected to the first water passage port 5.

The second water passage port 6 is an outlet of the cooling water C in the exhaust heat recovery device 1 in the present embodiment. The second water passage 6 is provided at the end of the third pipe 12. A hose for discharging cooling water is connected to the second water passage port 6.

The first water passage port 5 and the second water passage port 6 form both ends of the flow path of the cooling water C in the exhaust heat recovery device 1. That is, the upstream end of the flow path of the cooling water C in the exhaust heat recovery device 1 is the first water passage port 5, and the downstream end is the second water passage port 6. The cooling water C flows from the first water passage port 5 toward the second water passage port 6.

The third water outlet 7 and the fourth water outlet 8 are provided between the thermoactuator 4 and the first water outlet 5 in the flow path of the cooling water C, respectively. The third water outlet 7 and the fourth water outlet 8 allow cooling water to flow through the heat exchange unit 2.

In the present embodiment, the third water outlet 7 is a cooling water inlet to the heat exchange unit 2, and the fourth water outlet 8 is a cooling water outlet from the heat exchange unit 2. Therefore, the fourth water passage port 8 is arranged closer to the thermoactuator 4 than the third water passage port 7 in the flow path of the cooling water C.

The first pipe 10 is connected to the heat exchange unit 2 via the third water passage port 7, and the second pipe 11 is connected to the heat exchange unit 2 via the fourth water flow port 8. Therefore, the cooling water supplied from the first water passage port 5 passes through the first pipe 10 and enters the heat exchange section 2 from the third water passage port 7. The cooling water that has entered the heat exchange unit 2 passes through the second pipe 11 and the third pipe 12 from the fourth water outlet 8, and is discharged to the outside of the system from the second water outlet 6.

<Heat exchange section>
The heat exchange unit 2 is a portion that exchanges heat between the exhaust gas of the internal combustion engine and the cooling water. As shown in FIG. 3, the heat exchange unit 2 has a plurality of plates 21.

The heat exchange unit 2 exchanges heat between the exhaust gas flowing outside the plurality of plates 21 and the cooling water flowing inside the plurality of plates 21 via the plates 21. As a result, the heat exchange unit 2 gives the heat of the exhaust gas to the cooling water.

The plurality of plates 21 are stacked in the flow direction of the exhaust gas G. Each plate 21 has a disk-like shape. However, the shape of each plate 21 is not limited to the disk shape, and may be another shape such as a rectangular shape having an opening in the center. The cooling water supplied from the third water outlet 7 into each plate 21 branches into two ascending routes on the left and right in each plate 21 and then collects at the fourth water outlet 8.

<Valve>
The valve 3 adjusts the amount of exhaust gas supplied to the heat exchange unit 2. As shown in FIG. 3, the valve 3 is arranged between the exhaust gas inlet 13 and the exhaust gas outlet 14 in the exhaust heat recovery device 1.

When the valve 3 is closed, the exhaust gas G introduced into the exhaust heat recovery device 1 from the exhaust gas inlet 13 is supplied to the heat exchange section 2 from the heat exchange section inlet 15. The exhaust gas G cooled by the cooling water in the heat exchange unit 2 is discharged to the outside of the heat exchange unit 2 from the heat exchange unit outlet 16 and discharged from the exhaust gas outlet 14. However, the heat exchange unit 2 may be configured to discharge the exhaust gas G from the outside to the inside in the radial direction.

On the other hand, when the valve 3 is open, a part or all of the exhaust gas G introduced into the exhaust heat recovery device 1 from the exhaust gas inlet 13 passes through the bypass path 17 and passes through the heat exchange unit 2. It is discharged from the exhaust gas outlet 14.

The valve 3 is connected to the thermoactuator 4 via the cam 4A and the drive shaft 4B shown in FIG. The cam 4A is connected to the output unit 44 of the thermoactuator 4 and the drive shaft 4B. However, even if the cam 4A and the drive shaft 4B are configured to be separated from each other in one of the open state of the valve 3 and the closed state of the valve 3 and to be in contact with each other only in the other state. good.

The cam 4A is a member that converts the linear motion of the output unit 44 into the rotary motion of the drive shaft 4B. The drive shaft 4B is connected to the valve 3 and opens and closes the valve 3 by rotating its own shaft. That is, the valve 3 is switched between an open state and a closed state by the thermoactuator 4.

<Thermo actuator>
The thermoactuator 4 opens and closes the valve 3 according to the temperature of the cooling water. As shown in FIG. 4, the thermoactuator 4 has a thermal expansion portion 41, a casing 42, a sealing body 43, an output portion 44, and a spring 48.

The thermal expansion portion 41 is a rod-shaped member that expands and contracts due to the heat of the cooling water. The thermal expansion unit 41 has a thermal expansion body, a case for sealing the thermal expansion body, and a pressure receiving member arranged in the case. As the thermal expander, for example, wax can be used. The pressure receiving member is a member that deforms with the expansion or contraction of the thermal expansion body.

The thermal expansion portion 41 is arranged inside the casing 42. The thermal expansion portion 41 has a dipping portion 41A and a pressing portion 41B. The dipping portion 41A is provided at one end in the axial direction of the thermal expansion portion 41, and the pressing portion 41B is provided at the end in the axial direction opposite to the dipping portion 41A.

The dipping portion 41A is immersed in the cooling water supplied to the casing 42, and heat is transferred to and from the cooling water. The pressing unit 41B is arranged in the vicinity of the output unit 44 and extends in the axial direction due to thermal expansion to press the output unit 44 in the axial direction.

The casing 42 is a tubular member that houses the thermal expansion portion 41. The casing 42 has a first opening 45 for introducing the cooling water into the casing 42, a second opening 46 for discharging the cooling water from the casing 42, and an internal space 47 for storing the cooling water.

In the present embodiment, the central axis L1 of the first opening 45 and the central axis L2 of the second opening 46 are arranged parallel to each other and at the same position in the axial direction of the thermal expansion portion 41 when viewed from above. However, the central axis L1 of the first opening 45 may be offset in the axial direction of the thermal expansion portion 41 with respect to the central axis L2 of the second opening 46. Further, the central axis L1 of the first opening 45 and the central axis L2 of the second opening 46 do not have to be parallel to each other.

The first opening 45 and the second opening 46 communicate with the internal space 47. Further, a second pipe 11 is connected to the first opening 45. A third pipe 12 is connected to the second opening 46. In the internal space 47, the immersion portion 41A of the thermal expansion portion 41 is arranged.

The sealing body 43 is a member that seals between the thermal expansion portion 41 and the casing 42 to prevent leakage of cooling water from the thermoactuator 4 to the outside. As the sealing body 43, for example, a rubber O-ring can be used.

The sealing body 43 is attached to the outer peripheral surface of the thermal expansion portion 41. Specifically, the sealing body 43 is arranged between the outer peripheral surface of the thermal expansion portion 41 and the inner peripheral surface of the casing 42 in the region between the immersion portion 41A and the pressing portion 41B of the thermal expansion portion 41. Has been done.

The output unit 44 is a rod-shaped member that opens and closes the valve 3 by expanding and contracting the thermal expansion unit 41. Specifically, the output unit 44 is arranged outside the pressing unit 41B of the thermal expansion unit 41 so that the thermal expansion unit 41 and the central axis are parallel to each other.

The output unit 44 has a first end portion 44A close to the thermal expansion portion 41 and a second end portion 44B on the opposite side of the first end portion 44A.
The first end portion 44A comes into contact with the pressing portion 41B when the thermal expansion portion 41 expands. A cam 4A shown in FIG. 2 is attached to the second end portion 44B.

The spring 48 is a compression spring arranged so as to surround the output unit 44. The central axis of the spring 48 is parallel to the central axis of the output unit 44. The spring 48 defines the pressing force required to close the valve 3. Further, the spring 48 has a function of pushing the pressing portion 41B back toward the internal space 47 by an elastic force.

When the thermal expansion unit 41 expands, the output unit 44 is pressed by the pressing unit 41B and slides in the axial direction. When the output portion 44 slides, the cam 4A attached to the second end portion 44B rotates. The rotation of the cam 4A opens the valve 3 via the drive shaft 4B. Also, the spring 48 is compressed.

On the other hand, when the thermal expansion portion 41 contracts, the pressing portion 41B retracts in the direction opposite to that at the time of expansion, so that the pressing portion 41B does not press the output portion 44. Therefore, the valve 3 is closed by the restoring force of the compressed spring 48.

<Positional relationship of each part>
As shown in FIG. 1A, the first water passage port 5 is arranged below the thermoactuator 4. Further, the uppermost portion T1 of the inner surface of the third pipe 12 constituting the flow path of the cooling water C from the thermoactuator 4 to the second water passage port 6 is the uppermost portion of the thermal expansion portion 41 of the thermoactuator 4 and the sealing body 43. It is located above T2. The uppermost portion T1 of the inner surface of the third pipe 12 is a portion located on the uppermost side of the inner surface of the wall 12A constituting the third pipe 12, and is the uppermost portion in the internal flow path of the third pipe 12. Is.

In the present embodiment, the third pipe 12 is arranged so as to extend linearly upward from the thermoactuator 4. The uppermost portion T3 of the second water passage port 6 is located above the uppermost portion T2 of the thermal expansion portion 41 and the sealing body 43, but a part of the second water passage port 6 is a thermal expansion portion 41. And located at the same height as the sealant 43. That is, a part of the second water passage port 6 overlaps the thermal expansion portion 41 and the sealing body 43 in the horizontal direction. In other words, the lowermost portion T4 of the second water passage 6 is located below the uppermost portion T2 of the thermal expansion portion 41 and the sealing body 43.

The inclination angle θ (acute angle) of the uppermost portion T1 of the inner surface of the third pipe 12 with respect to the horizontal direction is appropriately designed in consideration of the inclination of the automobile on which the exhaust heat recovery device 1 is mounted. That is, the inclination angle θ of the uppermost portion T1 is larger than the maximum inclination angle (for example, 7 ° or 8 °) when the exhaust heat recovery device 1 is inclined in the direction in which the second water passage port 6 is displaced downward. good.

In the present embodiment, the fourth water passage port 8 is located above the thermal expansion portion 41 and the sealing body 43 of the thermoactuator 4. The second pipe 11 is arranged so as to extend linearly downward from the fourth water passage port 8 toward the thermoactuator 4. However, the second pipe 11 may be curved or bent in the middle.

Therefore, as shown in FIG. 1B, a storage space P capable of storing gas (that is, water vapor) is formed on the fourth water outlet 8 side of the second pipe 11 (that is, the upstream side in the flow path of the cooling water C). Has been done. The storage space P is located above the thermal expansion portion 41 of the thermoactuator 4 and the uppermost portion T2 of the sealing body 43. Specifically, the storage space P is located above the lowest point α of the uppermost portion T1 of the inner surface of the third pipe 12.

When the internal combustion engine is stopped, the circulation of the cooling water is stopped, or the flow rate of the cooling water is low, a part of the cooling water is changed to steam. This water vapor gradually accumulates from the upper side of the heat exchange unit 2. That is, water vapor accumulates in the storage space P. When the water vapor accumulates to a position where it reaches the uppermost portion T1 on the inner surface of the third pipe 12, the water vapor is discharged to the outside from the third pipe 12. Since the steam is discharged without coming into contact with the thermal expansion portion 41 and the sealing body 43 in this way, the thermal expansion portion 41 and the sealing body 43 are less likely to be affected by the heat of the steam.

Further, in the present embodiment, the fourth water outlet 8 is located above the third water outlet 7. Therefore, the cooling water C supplied from the third water passage port 7 to the heat exchange unit 2 exchanges heat with the exhaust gas while flowing upward in the heat exchange unit 2.

In this embodiment, the first pipe 10 is arranged so that its central axis is parallel to the horizontal direction. That is, the height of the center of the first water outlet 5 and the third water outlet 7 is the same. Further, the center of the third water inlet 7, the center of the fourth water outlet 8, and the center of the exhaust gas flow path (that is, the exhaust gas inlet 13 and the exhaust gas outlet 14 in FIG. 3) overlap each other in the vertical direction. Is located in. However, these centers do not necessarily have to overlap in the vertical direction.

[1-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(1a) The water vapor generated in the exhaust heat recovery device 1 does not stay in the region where it can come into contact with the thermal expansion portion 41 and the sealing body 43 of the thermoactuator 4, but flows upward due to the difference in specific gravity with water. It is discharged to the outside from the second water outlet 6. Therefore, heat damage to the thermoactuator 4 due to water vapor can be suppressed.

(1b) Water vapor can be retained in the storage space P that does not come into contact with the thermal expansion portion 41 and the sealing body 43, and then the water vapor overflowing from the storage space P can be discharged from the second water passage port 6. Therefore, it is possible to more stably suppress heat damage to the thermoactuator 4 due to water vapor.

(1c) Since the fourth water passage port 8 is located above the thermal expansion portion 41 and the sealing body 43, the height of the exhaust heat recovery device 1 is suppressed while suppressing heat damage to the thermoactuator 4 due to steam. The dimensions can be reduced.

(1d) Since the fourth water outlet 8 is located above the third water outlet 7, the heat exchange efficiency in the exhaust heat recovery device 1 is improved while suppressing heat damage to the thermoactuator 4 due to water vapor. Can be done.

[2. Other embodiments]
Although the embodiments of the present disclosure have been described above, it is needless to say that the present disclosure is not limited to the above-described embodiments and can take various forms.

(2a) In the exhaust heat recovery device 1 of the above embodiment, if the uppermost portion T1 of the inner surface is located above the thermal expansion portion 41 and the sealing body 43, the third pipe 12 is curved or bent in the middle. You may.

(2b) In the exhaust heat recovery device 1 of the above embodiment, the cooling water C may flow from the second water passage port 6 toward the first water passage port 5. In this case, the cooling water C is supplied from the fourth water outlet 8 to the heat exchange unit 2, and the cooling water C is discharged from the heat exchange unit 2 to the third water outlet 7.

(2c) In the exhaust heat recovery device 1 of the above embodiment, the positional relationship between the third water outlet 7 and the fourth water outlet 8 is an example. In the exhaust heat recovery device 1, for example, the third water passage port 7 and the fourth water passage port 8 may be arranged as follows.

In the exhaust heat recovery device 1A shown in FIG. 5A, the fourth water passage port 8 is at the same height as the thermal expansion portion and the sealing body of the thermoactor 4 (that is, the position where the thermal expansion portion and the sealing body are horizontally overlapped with each other). It is provided in.

In the exhaust heat recovery device 1B shown in FIG. 5B, the third water passage port 7 and the fourth water passage port 8 are provided at the same height. In the heat exchange section 2A of FIG. 5B, the cooling water C flows in the horizontal direction. In the exhaust heat recovery device 1B, the third water passage port 7 is also located above the thermal expansion portion and the sealing body of the thermoactuator 4.

In the exhaust heat recovery device 1C shown in FIG. 5C, in the exhaust heat recovery device 1B of FIG. 5B, the third water passage port 7 and the fourth water flow port 8 are provided at the same height as the thermal expansion portion and the sealing body of the thermoactuator 4. It was done.

In the exhaust heat recovery device 1D shown in FIG. 5D, the fourth water passage port 8 is provided at a position lower than the thermal expansion portion and the sealing body of the thermoactuator 4. In the exhaust heat recovery device 1D, the second pipe 11 has a thermal expansion portion of the thermoactuator 4 and a bending portion 11A located above the sealing body. Therefore, a storage space capable of storing gas is formed in the bent portion 11A. Further, in the exhaust heat recovery device 1D, the third water passage port 7 and the fourth water passage port 8 are provided at the same height.

In the exhaust heat recovery device 1E shown in FIG. 5E, in the exhaust heat recovery device 1D of FIG. 5D, the bent portion 11A in the second pipe 11 is provided at the same height as the thermal expansion portion and the sealing body of the thermoactuator 4. It is a thing.

In the exhaust heat recovery device 1F shown in FIG. 5F, in the exhaust heat recovery device 1D of FIG. 5D, the third water passage port 7 is provided below the fourth water flow port 8.
In the exhaust heat recovery device 1G shown in FIG. 5G, the third water passage port 7 is provided below the fourth water flow port 8 in the exhaust heat recovery device 1E of FIG. 5E.

(2d) The functions of one component in the above embodiment may be dispersed as a plurality of components, or the functions of the plurality of components may be integrated into one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or substituted with respect to the other configurations of the above embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

1,1A, 1B, 1C, 1D, 1E, 1F, 1G ... Exhaust heat recovery device,
2,2A ... Heat exchanger, 3 ... Valve, 4 ... Thermoactuator, 4A ... Cam,
4B ... Drive shaft, 5 ... 1st water outlet, 6 ... 2nd water outlet, 7 ... 3rd water outlet, 8 ... 4th water outlet,
10 ... 1st pipe, 11 ... 2nd pipe, 11A ... Bent part, 12 ... 3rd pipe, 12A ... Wall,
13 ... Exhaust gas inlet, 14 ... Exhaust gas outlet, 15 ... Heat exchange part inlet,
16 ... heat exchange section outlet, 17 ... bypass path, 21 ... plate, 41 ... thermal expansion section,
41A ... Immersion part, 41B ... Pressing part, 42 ... Casing, 43 ... Sealed body, 44 ... Output part,
44A ... 1st end, 44B ... 2nd end, 45 ... 1st opening, 46 ... 2nd opening,
47 ... internal space, 48 ... spring.

Claims (5)

A heat exchange unit that exchanges heat between the exhaust gas of the internal combustion engine and the cooling water,
A valve that adjusts the amount of exhaust gas supplied to the heat exchange unit,
The thermal expansion portion that expands and contracts due to the heat of the cooling water, the casing that houses the thermal expansion portion, the sealant that seals between the thermal expansion portion and the casing, and the valve that opens and closes due to the expansion and contraction of the thermal expansion portion. A thermoactor with an output unit to make it
The first water outlet and the second water outlet constituting both ends of the cooling water flow path,
A space that can store gas and is provided between the thermoactuator and the heat exchange unit in the cooling water flow path.
It is an exhaust heat recovery device equipped with
The first water outlet is arranged below the thermoactuator.
An exhaust heat recovery device in which the uppermost portion of the inner surface of a pipe constituting the cooling water flow path from the thermoactuator to the second water passage port is located above the thermal expansion portion and the sealing body. The exhaust heat recovery device according to claim 1.
The space is an exhaust heat recovery device located above the thermal expansion portion and the uppermost portion of the sealing body. A heat exchange unit that exchanges heat between the exhaust gas of the internal combustion engine and the cooling water,
A valve that adjusts the amount of exhaust gas supplied to the heat exchange unit,
The thermal expansion portion that expands and contracts due to the heat of the cooling water, the casing that houses the thermal expansion portion, the sealant that seals between the thermal expansion portion and the casing, and the valve that opens and closes due to the expansion and contraction of the thermal expansion portion. A thermoactor with an output unit to make it
The first water outlet and the second water outlet constituting both ends of the cooling water flow path,
A space that can store gas and is provided between the thermoactuator and the first water passage port in the cooling water flow path.
It is an exhaust heat recovery device equipped with
The first water outlet is arranged below the thermoactuator.
The uppermost portion of the inner surface of the pipe constituting the cooling water flow path from the thermoactuator to the second water passage port is located above the thermal expansion portion and the sealing body.
The heat exchange section is provided between the thermoactuator and the first water flow port in the cooling water flow path, and has a third water flow port and a fourth water flow port for circulating cooling water to the heat exchange section, respectively. Have and
The fourth water outlet is arranged closer to the thermoactuator than the third water outlet in the cooling water flow path, and is located above the thermal expansion portion and the sealing body. Collector. A heat exchange unit that exchanges heat between the exhaust gas of the internal combustion engine and the cooling water,
A valve that adjusts the amount of exhaust gas supplied to the heat exchange unit,
The thermal expansion portion that expands and contracts due to the heat of the cooling water, the casing that houses the thermal expansion portion, the sealant that seals between the thermal expansion portion and the casing, and the expansion and contraction of the thermal expansion portion opens and closes the valve. A thermoactor with an output unit to make it
The first water outlet and the second water outlet constituting both ends of the cooling water flow path,
It is an exhaust heat recovery device equipped with
The first water outlet is arranged below the thermoactuator.
The uppermost portion of the inner surface of the pipe constituting the cooling water flow path from the thermoactuator to the second water passage port is located above the thermal expansion portion and the sealing body.
The heat exchange section is provided between the thermoactuator and the first water flow port in the cooling water flow path, and has a third water flow port and a fourth water flow port for circulating cooling water to the heat exchange section, respectively. Have and
The fourth water outlet is arranged closer to the thermoactuator than the third water outlet in the cooling water flow path, and is located above the thermal expansion portion and the sealing body. Collector. The exhaust heat recovery device according to any one of claims 1 to 4 .
The heat exchange section is provided between the thermoactuator and the first water flow port in the cooling water flow path, and has a third water flow port and a fourth water flow port for circulating cooling water to the heat exchange section, respectively. Have and
The fourth water outlet is an exhaust heat recovery device that is arranged closer to the thermoactuator than the third water outlet in the cooling water flow path and is located above the third water outlet.

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