JP7453003B2 - Integrated exhaust heat recovery device - Google Patents

Description

The present disclosure relates to an integrated exhaust heat recovery device that can integrate a purification device that purifies vehicle exhaust gas and an exhaust heat recovery device that recovers heat from the exhaust gas.

The integrated exhaust heat recovery device disclosed in Patent Document 1 includes a connecting portion, which is a portion located on the downstream side of the exhaust gas purification device, and is a tapered portion whose diameter decreases as it goes downstream, and a connecting portion. A pipe-shaped collection part extending straight from the outlet to the downstream side. Further, a plurality of plates are provided that surround the sides of the gathering portion, and each plate is formed with a flow path for the engine coolant. Further, a valve is provided downstream of the outlet of the collecting section.

The exhaust gas that has passed through the purification device and from which harmful substances have been removed flows into the collecting part through the connection, and then reaches the outlet of the collecting part. When the valve is closed, the exhaust gas flowing out from the outlet of the collecting section flows out to the side of the collecting section and heads toward the plurality of plates. After that, the exhaust gas comes into contact with the plurality of plates, so that heat exchange occurs between the exhaust gas and the engine coolant flowing through the plurality of plates, and the heat of the exhaust gas is recovered.

WO2017/126124

Further, in the integrated exhaust heat recovery device of Patent Document 1, each plate is arranged in a direction perpendicular to the downstream direction of exhaust gas. Further, the tapered connection part has an inclined part whose diameter decreases toward the downstream side, and a flat part perpendicular to the flow direction of the exhaust gas at the downstream end of the inclined part so as to surround the outlet. It is provided. The flat portion supports the most upstream plate.

However, an extra gap is created between the inclined part at the connection part and the most upstream plate, which hinders miniaturization of the integrated exhaust heat recovery device. In addition, the smooth flow of exhaust gas was hindered by the flat portion around the outlet of the connection.

In one aspect of the present disclosure, it is desirable to downsize the device while allowing exhaust gas to flow down smoothly.

One aspect of the present disclosure is an integrated exhaust heat recovery device disposed in a flow path of exhaust gas from an engine of a vehicle, which includes a case member, a reduction portion, a placement portion, a plurality of plates, and a valve portion. , and an outer shell member. An exhaust gas purification device can be placed in the case member. The reduced portion surrounds the flow path through which the exhaust gas that has passed through the purification device flows down. The arrangement portion extends in the axial direction from the outlet, which is an opening on the downstream side of the contraction portion, and forms a flow path for exhaust gas flowing out from the outlet. The plurality of plates are members in which heat exchange passages, which are fluid passages, are formed in order to perform heat exchange between exhaust gas and fluid, and are arranged on the side of the arrangement part so as to surround the arrangement part. , are members arranged side by side along the axial direction. The valve portion is configured to switch the path of the exhaust gas that has passed through the purification device. The outer shell member is a member surrounding the plurality of plates. At least a portion of the reduced portion including the outlet is inclined with respect to a reference plane perpendicular to the axial direction so that the width of the exhaust gas flow path becomes narrower toward the outlet. Further, each of the plurality of plates is arranged along the reduced portion so as to be inclined with respect to the reference plane.

According to the above configuration, since the reduced portion and the plurality of plates have an inclination, it is possible to suppress the generation of extra gaps between the reduced portion and the plates, and to downsize the integrated exhaust heat recovery device. can be achieved. Further, the inclination allows the exhaust gas to flow smoothly down the reduced portion and the gaps between the plates. Additionally, compared to the case where multiple plates are spread out along the reference plane, the area of the parts of the multiple plates that come into contact with the exhaust gas can be increased without increasing the width of the integrated exhaust heat recovery device. , the amount of heat recovered from the exhaust gas may be increased. This makes it possible to reduce the number of plates and downsize each plate without degrading the performance of heat recovery from exhaust gas, thereby shortening the length and width of the integrated exhaust heat recovery device. It becomes possible. Therefore, the integrated exhaust heat recovery device can be downsized while allowing the exhaust gas to flow down smoothly.

Note that the valve portion is located downstream of the plurality of plates.
According to the above configuration, exhaust gas can be suitably guided to a plurality of plates.
Further, each of the plurality of plates may have an annular shape.

According to the above configuration, it is possible to promote a uniform flow of exhaust gas in the gaps between the plurality of plates and around the plurality of plates. Therefore, the efficiency of heat exchange between the exhaust gas and the fluid can be improved.

Further, the integrated exhaust heat recovery device may further include a first connecting member that surrounds the exhaust gas flow path between the downstream opening of the case member and the upstream opening of the contracted portion.
According to the above configuration, by changing the configuration of the first connecting member, case members of different sizes and the reduced portion can be connected. For this reason, for example, even if the size of the case member changes depending on the vehicle in which the integrated exhaust heat recovery device is installed, the reduced part, arrangement part, and multiple It may be unnecessary to change the plate, valve portion, outer shell member, etc. Similarly, even if there is a change in the part that functions as the exhaust heat recovery device, the case member may not need to be changed. Therefore, the cost required for developing or manufacturing an integrated exhaust heat recovery device can be suppressed.

Furthermore, the integrated exhaust heat recovery device has an opening between the downstream opening of the outer shell member and the upstream opening of the downstream member that forms the exhaust gas flow path downstream of the integrated exhaust heat recovery device. The device may further include a second connecting member surrounding the exhaust gas flow path.

According to the above configuration, by changing the configuration of the second connection member, it is possible to connect the outer shell member and the downstream member of different sizes. Therefore, for example, even if the size of the downstream component changes depending on the vehicle in which the integrated exhaust heat recovery device is installed, there is no need to change the part or case component that functions as the exhaust heat recovery device. It can be. Therefore, the cost required for developing or manufacturing an integrated exhaust heat recovery device can be suppressed.

Furthermore, each of the plurality of plates may include first and second members that extend along the heat exchange channel and face each other along the thickness direction of the plate with the heat exchange channel in between. . Moreover, each of the first and second members may have an inner edge extending along the inner circumferential edge of the plate and an outer edge extending along the outer circumferential edge of the plate. Then, the inner edge of the first member and the inner edge of the second member may be joined, and the outer edge of the first member and the outer edge of the second member may be joined.

According to the above configuration, the plate can be easily assembled.

FIG. 2 is a cross-sectional side view of the integrated exhaust heat recovery device. FIG. 2 is a cross-sectional side view of a portion of a plurality of plates of the integrated exhaust heat recovery device in which an inlet member and an outlet member are provided. It is a front view of the downstream part of a plate. FIG. 3 is a cross-sectional view orthogonal to the heat exchange channels in the plate. FIG. 3 is a cross-sectional view orthogonal to the heat exchange channels in the plate.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that the embodiments of the present disclosure are not limited to the embodiments described below, and may take various forms as long as they fall within the technical scope of the present disclosure.

[1. Overall configuration]
The integrated exhaust heat recovery device 1 of this embodiment is mounted on a vehicle having an engine (see FIG. 1). The integrated exhaust heat recovery device 1 is a device that integrates a purification device 20 that purifies engine exhaust gas and an exhaust heat recovery device 3 that recovers heat from the exhaust gas, and is arranged in the flow path of the exhaust gas. . Specifically, the integrated exhaust heat recovery device 1 includes a case member 2 and an exhaust heat recovery device 3.

[2. Case components]
The case member 2 is a pipe-shaped member in which an exhaust gas flow path is formed, and an exhaust gas purification device 20 can be placed in the flow path. For example, the case member 2 extends in the axial direction 10 and includes an inlet portion 21 and a main body portion 22 (see FIG. 1).

The inlet portion 21 is a cylindrical portion that forms an inlet for exhaust gas into the case member 2 and guides the exhaust gas flowing from the inlet to the main body portion 22 . The diameter of the inlet portion 21 increases toward the downstream side.

The main body portion 22 is a cylindrical portion in which the purification device 20 can be placed. Here, the purifier 20 may be, for example, a columnar catalyst. Specifically, a catalyst has, for example, a large number of exhaust gas passages extending in the axial direction 10 formed therein, and purifies the exhaust gas by oxidizing and/or reducing the exhaust gas passing through these passages. It may be configured to do so. More specifically, the catalyst may be, for example, an oxidation catalyst that oxidizes substances such as nitrogen monoxide (NO), carbon monoxide (CO), or hydrocarbons (HC) contained in exhaust gas. Further, the catalyst may be, for example, an SCR (Selective Catalytic Reduction) catalyst that reduces NOx in exhaust gas. In addition to this, the purification device 20 may be, for example, a cylindrical filter that captures and burns PM (particulate matter) in exhaust gas.

[3. Exhaust heat recovery device]
The exhaust heat recovery device 3 is disposed downstream of the case member 2, recovers heat from high-temperature exhaust gas, and transfers it to the engine coolant. Note that the cooling liquid may be, for example, a fluid such as cooling water or oil liquid. Specifically, the exhaust heat recovery device 3 forms an exhaust gas flow path on the downstream side of the case member 2, and performs heat exchange between the exhaust gas passing through the flow path and the cooling liquid. The exhaust heat recovery device 3 includes a reduction section 30, an arrangement section 33, an outer section 36, a partition section 38, an outer shell member 46, a valve section 4, a plurality of plates 5, and first and second connections. It includes members 48 and 49.

[4. Reduced section]
The reduction part 30 is provided on the downstream side of the purification device 20 (in other words, the case member 2), and is a wall-shaped portion surrounding a flow path through which the exhaust gas that has passed through the purification device 20 flows down (see FIG. 1, (see 2). Further, in the reduced portion 30, the width of the exhaust gas flow path becomes narrower toward the downstream side. Hereinafter, the upstream opening of the reducing section 30 will be referred to as an inlet 31, and the downstream opening of the reducing section 30 will be referred to as an outlet 32.

More specifically, the reduced portion 30 is configured such that at least a portion including the outlet 32 is formed with respect to a plane perpendicular to the axial direction 10 (hereinafter referred to as the reference plane 11) so that the width of the exhaust gas flow path becomes narrower toward the outlet 32. It spreads in an inclined manner (see Figures 1 and 2). In this embodiment, the reduced portion 30 is formed in a tapered shape extending in the axial direction 10, and the direction of the axis 13 extending from the center of the inlet 31 to the center of the outlet 32 substantially coincides with the axial direction 10. . In addition, the entire section of the reduction section 30 from the inlet 31 to the outlet 32 has a substantially constant slope with respect to the reference plane 11, for example. Note that the gradient in the reduction section 30 is determined as appropriate.

Further, the inlet 31 of the reduced portion 30 is connected to the outlet 23, which is an opening on the downstream side of the case member 2, via a first connecting member 48, which is a joint-like part. Specifically, the first connecting member 48 is a connection between the outlet 23 of the case member 2 and the inlet 31 of the reduced part 30, which is configured as a separate member from the case member 2, the reduced part 30, and the outer shell member 46. This is a wall-shaped member that surrounds the exhaust gas flow path between the two. The first connecting member 48 has an upstream end joined to the edge surrounding the outlet 23 of the case member 2 , and a downstream end joined to the edge surrounding the inlet 31 of the reduced portion 30 . Note that, for example, by joining the downstream end of the first connecting member 48 to the edge surrounding the upstream opening of the outer shell member 46, the inlet 31 of the reduced portion 30 and the outlet 23 of the case member 2 can be connected. You can also connect.

[5. Placement]
The arrangement portion 33 extends substantially straight in the axial direction 10 from the outlet 32 of the reduced portion 30, and forms a flow path for exhaust gas flowing out from the outlet 32 (see FIGS. 1 and 2). The arrangement portion 33 is, for example, formed in a cylindrical shape. Hereinafter, the upstream opening and the downstream opening in the arrangement portion 33 will be referred to as an inlet 34 and an outlet 35, respectively. Further, hereinafter, a cross section perpendicular to the axial direction 10 will be simply referred to as a cross section. The center of the cross section of the arrangement portion 33 substantially coincides with the position of the axis 13.

[6. Outer shell member]
The outer shell member 46 is a wall-shaped portion surrounding the outer circumferential surface of the arrangement portion 33 and the outer circumferential surface of the reduced portion 30 (see FIGS. 1 and 2). In this embodiment, the outer shell member 46 is formed as a cylindrical member, for example, and the center of the cross section of the outer shell member 46 substantially coincides with the position of the axis 13. Further, the arrangement portion 33 is located approximately at the center of the cross section of the outer shell member 46. The edge of the outer shell member 46 surrounding the upstream opening is joined to a portion of the outer peripheral surface of the reduced portion 30 near the entrance 31, and the outer shell member 46 extends in the axial direction 10 from this portion.

Further, the outer shell member 46 is arranged so as to be spaced apart from the outer peripheral surface of the arrangement section 33, and a heat exchange chamber 42 is formed between the outer shell member 46 and the arrangement section 33. The heat exchange chamber 42 surrounds the side of the arrangement section 33 and is adjacent to the contraction section 30 on the downstream side. Note that details of the heat exchange chamber 42 will be described later.

Further, the outlet 47 that is the downstream opening of the outer shell member 46 is connected to the inlet that is the upstream opening of the downstream member 12 via the second connecting member 49 . Note that the downstream member 12 is a pipe-shaped member that forms a flow path for exhaust gas on the downstream side of the integrated exhaust heat recovery device 1, and the exhaust gas that has passed through the exhaust heat recovery device 3 is transferred to the downstream member 12. flows into.

Specifically, the second connection member 49 is configured as a separate member from the outer shell member 46 and the downstream member 12, and is configured to connect the exhaust gas between the outlet 47 of the outer shell member 46 and the inlet of the downstream member 12. It is a wall-shaped member surrounding the flow path, and is formed in a tapered shape, for example. Further, the second connecting member 49 has an upstream end joined to an edge surrounding the outlet 47 of the outer shell member 46, and a downstream end joined to an edge surrounding the inlet of the downstream member 12. .

[7. Outside part and partition]
The outer part 36 is arranged so as to surround the outer peripheral surface of the arrangement part 33 from the outside. In this embodiment, the outer portion 36 is formed as a cylindrical portion extending in the axial direction 10, for example (see FIGS. 1 and 2). The outer portion 36 is spaced apart from the reduced portion 30 . Further, the outer part 36 is arranged around the outlet 35 of the arrangement part 33 and is spaced apart from the arrangement part 33. That is, a gap is formed between the outer portion 36 and the outer circumferential surface of the placement portion 33 so as to surround the placement portion 33 . The gap forms an inlet flow path 43 that communicates with a heat exchange chamber 42 located upstream of the outer portion 36 .

The partition portion 38 is a wall-shaped portion that extends toward the outer shell member 46 from the edge surrounding the upstream opening of the outer portion 36 . The partition part 38 extends so as to surround the outer peripheral surface of the arrangement part 33, and closes off the heat exchange chamber 42 from the downstream side. Further, a gap is formed between the outer peripheral edge of the partition portion 38 and the outer shell member 46, and the gap forms an outlet 44 communicating with the heat exchange chamber 42.

Moreover, the partition part 38 faces the reduction part 30 with the heat exchange chamber 42 in between, and is inclined with respect to the reference plane 11 in the same manner as the reduction part 30. In this embodiment, as described above, the reduction part 30 is formed in a tapered shape, and the partition part 38 is also formed in an inclined taper shape similarly to the reduction part 30. That is, the partition portion 38 extends substantially parallel to the reduced portion 30.

[8. Multiple plates]
The plurality of plates 5 are arranged in the heat exchange chamber 42 and form a heat exchanger that exchanges heat between the exhaust gas and the cooling liquid (see FIGS. 1 to 3). Each plate 5 is a flat band-shaped member that extends along a closed path and has a substantially constant width. Each plate 5 is formed with a heat exchange channel 50 through which the cooling liquid flows, and the heat exchange channel 50 extends around the plate 5 . Note that each plate 5 has a similar configuration.

The plurality of plates 5 are arranged in the heat exchange chamber 42 in a line along the axial direction 10, with gaps between adjacent plates 5. Further, gaps are formed between the most upstream plate 5 and the reduced portion 30 and between the most downstream plate 5 and the partition portion 38, respectively. Moreover, each plate 5 is arranged on the side of the arrangement part 33 so as to surround the arrangement part 33.

Further, each plate 5 is provided so as to be inclined with respect to the reference plane 11 along the reduced portion 30 and the partition portion 38 (see FIGS. 1 and 2). In other words, each plate 5 is inclined so that the inner circumferential edge thereof protrudes further in the axial direction 10 than the outer circumferential edge. In this embodiment, as an example, each plate 5 is formed in an annular shape (see FIG. 3). On the other hand, the reduced portion 30 and the partition portion 38 are formed in a tapered shape. For this reason, each plate 5 is also formed in a tapered shape similar to the reduction part 30 and the partition part 38.

Furthermore, an inlet 51 for the cooling liquid into the heat exchange channel 50 and an outlet 52 for the coolant from the heat exchange channel 50 are provided on the outer peripheral edge of each plate 5 (see FIG. 2). The inlet 51 and the outlet 52 face each other across the center of the plate 5. The plurality of plates 5 are arranged such that each inlet 51 and each outlet 52 are lined up along the axial direction 10.

Furthermore, each inlet 51 of the plurality of plates 5 is connected to an inlet member 53 that allows the cooling liquid to flow into the heat exchange channel 50 of each plate 5 . The inlet member 53 is formed with an inlet into which the cooling liquid flows, and the inlet communicates with the inlet 51 of each plate 5 . On the other hand, each outlet 52 in the plurality of plates 5 is connected to an outlet member 54 through which the cooling liquid in the heat exchange channel 50 of each plate 5 flows out. The outlet member 54 is formed with an outlet through which the cooling liquid flows, and the outlet communicates with the outlet 52 of each plate.

The inlet member 53 and the outlet member 54 are respectively arranged to protrude to the outside through openings formed in the outer shell member 46, and the inlet of the inlet member 53 and the outlet of the outlet member 54 are connected to the outer shell member. It opens toward the side of 46. The coolant then flows into the inlet 51 of each plate 5 via the inlet of the inlet member 53 and flows down each heat exchange channel 50. Thereafter, when the coolant reaches the outlet 52 of each heat exchange channel 50, it passes through the outlet of the outlet member 54 and flows out to the outside.

[9. Valve section]
The valve section 4 is configured to switch the course of the exhaust gas that has passed through the purification device 20 (more specifically, the arrangement section 33) so that it heads toward the plurality of plates 5 (see FIGS. 1 and 2). Specifically, the valve part 4 opens and closes the outlet 37 of the outer part 36 located downstream of the plurality of plates 5 (more specifically, the arrangement part 33). The valve portion 4 includes a valve body 40 and a cushioning material 41.

The valve body 40 rotates around a rotating shaft provided around the outlet 37, thereby being displaced to a closed position 40a or an open position 40b, thereby opening and closing the outlet 37 of the outer portion 36. The valve body 40 is driven by, for example, an elastic member such as a spring, an actuator, or the like.

Specifically, the closed position 40a is a position where the valve body 40 closes the outlet 37. On the other hand, the open position 40b is a position to the side of the outlet 37, and the valve body 40 in the open position 40b is spaced apart from the outlet 37. When the valve section 4 closes the outlet 37, the valve body 40 is displaced from the open position 40b to the closed position 40a, and when the valve section 4 opens the outlet 37, the valve body 40 is displaced from the closed position 40a. It is displaced from the open position 40b.

The cushioning material 41 is provided to reduce the impact when the valve body 40 closes the outlet 37 of the outer part 36. The cushioning material 41 is made of, for example, a wire mesh or the like, and is provided on the outer circumferential surface of the arrangement portion 33 so as to surround the outlet 37 . Note that the diameter of the portion of the outer portion 36 where the buffer material 41 is provided decreases toward the downstream.

When the outlet 37 of the outer part 36 is closed by the valve part 4, when the exhaust gas reaches the outlet 37, it collides with the valve body 40 in the closed position 40a and reverses its course. Then, the exhaust gas flows out to the side of the outlet 35 of the arrangement portion 33 and flows into the inlet flow path 43, flows down the inlet flow path 43 in the opposite direction of the axial direction 10, and flows into the heat exchange chamber 42. Thereafter, the exhaust gas that has flowed into the heat exchange chamber 42 flows down toward the outer circumferential side of the heat exchange chamber 42 while contacting the plate 5 . More specifically, the exhaust gas passes through the gap between the plates 5 , the gap between the plate 5 and the reduced part 30 , or the gap between the plate 5 and the partition part 38 , and reaches the outer peripheral side of the heat exchange chamber 42 . (In other words, it flows down toward the outer shell member 46 side). At this time, the heat of the exhaust gas is transferred to the cooling liquid flowing through the heat exchange channels 50 in each plate 5.

When the exhaust gas reaches the outer shell member 46, it flows down along the outer shell member 46 in the axial direction 10, passes through the outlet 44, and flows out of the heat exchange chamber 42. Thereafter, the exhaust gas passes through the second connecting member 49 and flows into the downstream member 12.

On the other hand, when the outlet 37 of the outer part 36 is opened by the valve part 4, the exhaust gas that has passed through the arrangement part 33 passes through the outlet 37, and then passes through the second connecting member 49 to the downstream member. 12.

[10. Structure of each plate]
Each plate 5 includes first and second members 6 and 7 facing each other along the thickness direction of the flat plate 5 (see FIGS. 3 to 5). The first and second members 6 and 7 are annular and tapered, and extend along the heat exchange channel 50 of the plate 5. Further, a heat exchange channel 50 is formed between the first and second members 6 and 7. Further, the first member 6 is located on the partitioning part 38 side (in other words, downstream), and the second member 7 is located on the reducing part 30 side (in other words, upstream).

The first member 6 includes an inner edge 60, an outer edge 61, and a main body 62. On the other hand, the second member 7 includes an inner edge 70 , an outer edge 71 , and a main body 72 .
The inner edge 60 of the first member 6 is a band-shaped portion that is formed over the entire inner circumferential edge of the first member 6 and extends along the inner circumferential edge. Further, the outer edge portion 61 is a band-shaped portion that is formed over the entire outer circumferential edge of the first member 6 and extends along the outer circumferential edge. Moreover, an annular main body portion 62 extending along the heat exchange channel 50 is formed between the inner edge portion 60 and the outer edge portion 61.

On the other hand, the inner edge portion 70 of the second member 7 is a band-shaped portion that is formed over the entire inner circumferential edge of the second member 7 and extends along the inner circumferential edge. Further, the outer edge portion 71 is a band-shaped portion that is formed over the entire outer circumferential edge of the second member 7 and extends along the outer circumferential edge. Furthermore, an annular main body portion 72 that extends along the heat exchange channel 50 is formed between the inner edge portion 70 and the outer edge portion 71 .

The inner edge 60 of the first member 6 is arranged to face the inner edge 70 of the second member 7, and these inner edges 60, 70 are joined. Further, the outer edge 61 of the first member 6 is arranged to face the outer edge 71 of the second member 7, and these outer edges 61, 71 are joined. At this time, the main bodies 62 and 72 of the first and second members 6 and 7 are separated, and a heat exchange channel 50 is formed between the main bodies 62 and 72.

More specifically, in the present embodiment, the first member 6 includes an inner wall portion 63 and an outer wall portion 64, which are wall-shaped portions that protrude in the thickness direction from the inner peripheral edge and outer peripheral edge of the main body portion 62, respectively. (See FIG. 4). The inner edge 60 projects outward from the heat exchange channel 50 from the end of the inner wall 63 on the second member 7 side, and the outer edge 61 also extends from the end of the inner wall 64 on the second member 7 side. protrudes from the end of the heat exchange channel 50 to the outside of the heat exchange channel 50 . On the other hand, in the second member 7, the inner edge 70, the outer edge 71, and the main body 73 are arranged flush. That is, the inner wall portion 63 and the outer wall portion 64 provided on the first member 6 separate the main body portions 62 and 72 of the first and second members 6 and 7 from each other.

Of course, the present invention is not limited to this, and instead of the first member 6, the second member 7 may be provided with an inner wall portion and an outer wall portion.
Further, for example, an inner wall portion 63 may be formed on the inner peripheral edge of the main body portion 62 in the first member 6, and the main body portion 62 and the outer edge portion 61 may be arranged flush with each other (see FIG. 5). ). Further, the outer wall portion 74 may be formed on the outer peripheral edge of the main body portion 72 in the second member 7, and the main body portion 72 and the inner edge portion 70 may be arranged flush. That is, the main bodies 62 and 72 of the first and second members 6 and 7 may be separated from each other by the inner wall 63 of the first member 6 and the outer wall 74 of the second member 7. Of course, on the contrary, the first member 6 is formed with an outer wall on its outer circumferential edge, and the second member 7 is formed with an inner wall on its inner circumferential edge, and these walls allow the first and second members to be connected to each other. The main bodies 62 and 72 of the members 6 and 7 may be separated from each other.

[11. effect]
(1) According to the above embodiment, since the reduced portion 30 and the plurality of plates 5 have an inclination, it is possible to suppress the generation of an extra gap between the reduced portion 30 and the most upstream plate 5. Therefore, the integrated exhaust heat recovery device 1 can be downsized. Furthermore, the inclination allows the exhaust gas to flow smoothly through the gaps between the reduced portion 30 and each plate 5. Thereby, the ventilation resistance of the integrated exhaust heat recovery device 1 can be suppressed, and as a result, it is possible to promote an improvement in the fuel efficiency of the engine, and it is also possible to suppress an adverse effect on the output of the engine.

Furthermore, compared to the case where the plurality of plates 5 spread along the reference plane 11, it is possible to increase the area of the portion of the plurality of plates 5 that comes into contact with the exhaust gas without increasing the width of the integrated exhaust heat recovery device 1. As a result, the amount of heat recovered from the exhaust gas can be increased. This makes it possible to reduce the number of plates 5 and downsize each plate 5 without degrading the performance of heat recovery from exhaust gas. The width can be reduced. Therefore, the integrated exhaust heat recovery device 1 can be downsized while allowing the exhaust gas to flow down smoothly.

Further, due to the slope of the partition portion 38, the exhaust gas can flow smoothly in the vicinity of the inlet flow path 43 in the heat exchange chamber 42. Further, the inclination makes it possible to secure a distance between the outlet 44 of the heat exchange chamber 42 formed on the outer peripheral edge of the partition part 38 and the outlet 37 of the outer part 36 that is opened and closed by the valve part 4. Therefore, the exhaust gas flowing out from the outlet 37 when the valve portion 4 is opened can be suppressed from flowing into the heat exchange chamber 42 from the outlet 44, and heat exchange between the exhaust gas and the cooling liquid can be prevented from being performed more than necessary. It can be suppressed.

(2) Furthermore, when the valve part 4 is closed, the exhaust gas flowing down the arrangement part 33 at high speed collides with the valve body 40 and flows out laterally from the outlet 35 of the arrangement part 33, and is guided to the plurality of plates 5. be done. Therefore, the flow velocity of the exhaust gas toward the plurality of plates 5 and the flow velocity of the exhaust gas passing between the plurality of plates 5 are improved, making it possible to further maintain the exhaust gas at a high temperature. Therefore, the efficiency of heat exchange between the exhaust gas and the coolant can be improved.

(3) Furthermore, since each plate 5 is annular, the flow of exhaust gas in the gaps between the plurality of plates 5 and around the plurality of plates 5 can be made uniform. Therefore, the efficiency of heat exchange between the exhaust gas and the coolant can be improved.

(4) Furthermore, the outlet 23 of the case member 2 and the inlet 31 of the reduced portion 30 are connected by the first connecting member 48 . Therefore, by changing the configuration of the first connecting member 48, the case member 2 and the reduced portion 30 of different sizes can be connected. Therefore, for example, even if the size of the case member 2 changes depending on the vehicle in which the integrated exhaust heat recovery device 1 is installed, there is no need to change the part that functions as the exhaust heat recovery device 3. obtain. Similarly, even if the part that functions as the exhaust heat recovery device 3 is changed, the case member 2 may not need to be changed. Therefore, the cost required for developing or manufacturing the integrated exhaust heat recovery device 1 can be suppressed.

(5) Furthermore, the outlet 47 of the outer shell member 46 and the inlet of the downstream member 12 are connected by a second connecting member 49 . Therefore, by changing the configuration of the second connecting member 49, the outer shell member 46 and the downstream member 12 of different sizes can be connected. Therefore, for example, even if the size of the downstream member 12 is changed depending on the vehicle in which the integrated exhaust heat recovery device 1 is installed, the part that functions as the exhaust heat recovery device 3 or the case member 2 changes may not be necessary. Therefore, the cost required for developing or manufacturing the integrated exhaust heat recovery device 1 can be suppressed.

(6) Furthermore, as described above, in this embodiment, each plate 5 is arranged at an angle, so that a sufficient area of the portion of each plate 5 that comes into contact with the exhaust gas can be ensured. Therefore, heat can be sufficiently recovered from the exhaust gas without providing the heat exchange flow path 50 over the entire area of each plate 5. Therefore, in this embodiment, inner edges 60 and 70 and outer edges 61 and 71 are provided on the inner and outer edges of the first and second members 6 and 7 that constitute the plate 5, respectively. Each plate 5 is formed by joining the inner edges 60, 70 and the outer edges 61, 71 of the first and second members 6, 7, respectively. This facilitates assembly of each plate 5.

[12. Other embodiments]
(1) In the embodiment described above, the entire section of the reduced portion 30 from the inlet 31 to the outlet 32 has a substantially constant slope with respect to the reference plane 11. However, for example, the section of the reduction section 30 including the outlet 32 may be inclined with respect to the reference plane 11, and the remaining section may be made to expand along the reference plane 11. Even with such a configuration, similar effects can be obtained.

(2) In the embodiment described above, the reduction portion 30 and the partition portion 38 are formed in a tapered shape. However, the reduction part 30 and the partition part 38 have a cross section other than a circular shape (for example, an ellipse or a polygon), and are designed so that the width of the exhaust gas flow path becomes narrower toward the downstream side relative to the reference surface 11. It may be inclined. Then, each plate 5 may have the same shape as the reduced portion 30 and the partition portion 38, and the plurality of plates 5 may be arranged in an inclined state with respect to the reference plane 11 along the reduced portion 30 and the partition portion 38. Even with such a configuration, similar effects can be obtained.

(3) In the embodiment described above, the diameter of the outer shell member 46 is smaller than the diameter of the main body portion 22 of the case member 2. However, the diameter of the outer shell member 46 may be larger than the diameter of the main body portion 22 of the case member 2. Even with such a configuration, similar effects can be obtained.

(4) In the embodiment described above, exhaust gas is guided to the plurality of plates 5 by closing the outlet 37 of the outer part 36 located downstream of the plurality of plates 5 by the valve part 4. However, for example, the entrance to the heat exchange chamber 42 may be formed near the entrance 31 of the contraction section 30. Further, for example, a valve section may be provided that opens and closes a position on the upstream side of the plurality of plates 5 in the arrangement section 33 or a position on the side of the plurality of plates 5. Then, by closing the valve portion, the exhaust gas that has passed through the purification device 20 may be guided to the plurality of plates 5. Even with such a configuration, similar effects can be obtained.

(5) In the above embodiment, the reduced portion 30 and the first connecting member 48 may be configured as an integrated member, and the portion of the member including the inlet may be configured as the first connecting member. Alternatively, the outer shell member 46 and the second connecting member 49 may be configured as an integrated member, and a portion of the member including the outlet may be configured as the second connecting member. Even in such a case, similar effects can be obtained.

(6) Multiple functions of one component in the above embodiments may be realized by multiple components, and one function of one component may be realized by multiple components. . Further, a plurality of functions possessed by a plurality of constituent elements may be realized by one constituent element, or one function realized by a plurality of constituent elements may be realized by one constituent element. 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 to or replaced with the configuration of other embodiments.

DESCRIPTION OF SYMBOLS 1... Integrated exhaust heat recovery device, 10... Axial direction, 11... Reference plane, 12... Downstream side member, 13... Axis line, 2... Case member, 20... Purification device, 3... Exhaust heat recovery device, 30... Reduction part , 31... Outlet, 33... Arrangement part, 4... Valve part, 46... Outer shell member, 48... First connection member, 49... Second connection member, 5... Plate, 50... Heat exchange channel, 6... First Member, 60...inner edge, 61...outer edge, 7...second member, 70...inner edge, 71...outer edge.

Claims (4)

An integrated exhaust heat recovery device disposed in a flow path of exhaust gas from a vehicle engine, the device comprising:
a case member in which the exhaust gas purification device can be placed;
a reduced portion surrounding a flow path through which the exhaust gas that has passed through the purification device flows;
an arrangement part that extends in the axial direction from an outlet that is an opening on the downstream side of the contraction part and forms a flow path for the exhaust gas flowing out from the outlet;
A member having a heat exchange flow path, which is a flow path for the fluid, formed therein to perform heat exchange between the exhaust gas and the fluid, the member surrounding the placement portion on the side of the placement portion; a plurality of plates that are members arranged side by side along the axial direction;
an outer portion that is a cylindrical portion extending from a position downstream of the plurality of plates and lateral to the placement portion to a position downstream of the placement portion;
a partition part that extends laterally of the outer part so as to surround the arrangement part and is located on the downstream side of the plurality of plates;
a valve portion configured to switch the course of the exhaust gas that has passed through the purification device by opening and closing an opening on the downstream side of the outer portion;
an outer shell member surrounding the plurality of plates,
Each of the plurality of plates has a flat annular shape and a conical shape, and has two faces facing each other in the thickness direction , and two adjacent plates have two faces facing each other in the thickness direction. Lined up with
At least a portion of the contracted portion including the outlet is inclined with respect to a reference plane perpendicular to the axial direction so that the width of the exhaust gas flow path becomes narrower toward the outlet;
A cross section including an axis and parallel to the axis in a portion of the reducing portion including at least the outlet, the cross section of the plurality of plates, and the cross section of the partition portion extend substantially parallel to each other, and the cross section includes the axis and is parallel to the axis. is a line passing through the center of the outlet of the contracting section and extending in the axial direction.Integrated exhaust heat recovery device. The integrated exhaust heat recovery device according to claim 1,
The integrated exhaust heat recovery device further includes a first connecting member that surrounds the flow path of the exhaust gas between the downstream opening of the case member and the upstream opening of the reduced portion. An integrated exhaust heat recovery device according to claim 1 or claim 2,
surrounding the exhaust gas flow path between the downstream opening of the outer shell member and the upstream opening of the downstream member that forms the exhaust gas flow path downstream of the integrated exhaust heat recovery device; The integrated exhaust heat recovery device further includes a second connection member. An integrated exhaust heat recovery device according to any one of claims 1 to 3,
Each of the plurality of plates has first and second members that extend along the heat exchange flow path and face each other along the thickness direction of the plate with the heat exchange flow path in between,
Each of the first and second members is
An annular main body,
an inner edge located on the inner circumferential side of the main body and extending along the inner circumferential edge of the plate;
an outer edge located on the outer circumferential side of the main body and extending along the outer circumferential edge of the plate;
has
the inner edge of the first member and the inner edge of the second member are joined;
The outer edge of the first member and the outer edge of the second member are joined. The inner edge is the body of the first and second members in the plate including the inner edge. Spreads out substantially parallel to, or spreads out on substantially the same plane as,
The outer edge extends substantially parallel to or extends substantially on the same plane as the main body portions of the first and second members in the plate including the outer edge.

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