Exhaust heat recovery device

Abstract

The exhaust heat recovery device (100) comprises: a first flow path component (1) having a first flow path (14) formed therein; a second flow path component (2) arranged adjacent to the first flow path component (1) and having a second flow path (24) formed therein, and having a heat exchange portion (3) for performing heat exchange between the exhaust gas flowing in the second flow path (24) and a coolant; and a valve unit (4) for switching between the first flow path (14) and the second flow path (24) by rotating a rotating shaft portion (43) disposed in the first flow path component (14). 24) opening and closing; and a driving portion (5), which has a driving shaft (51) for rotating the rotating shaft portion (43), the second flow path component (2) is configured to be inclined relative to the flow direction of the exhaust gas in the first flow path (14), and the second flow path component (2) is configured to be inclined relative to the first flow path component (1), whereby, in an axial view of the driving shaft (51), in an area formed on the side of the second flow path component (2), the driving shaft (51) extends toward the first flow path component (1) and is connected to the rotating shaft portion (43).

Description

Technical Field

[0001] The invention relates to an exhaust heat recovery device. Background Art

[0002] JP6170842B discloses an exhaust heat recovery device, which has a first flow path for exhaust gas to pass through a heat exchanger and a second flow path for exhaust gas to bypass the heat exchanger, and recovers the heat of the exhaust gas by heat exchange between the exhaust gas and the medium. In the exhaust heat recovery device, the first valve body closes the second flow path by rotating the valve shaft. If the exhaust gas is introduced into the exhaust heat recovery device in this state, the exhaust gas flows to the first flow path and heats the medium flowing in the heat exchanger. Summary of the invention

[0003] However, in the exhaust heat recovery device of JP6170842B, the heat exchanger is arranged in parallel with the second flow path at a position in front of the valve shaft. Therefore, it is difficult to make the exhaust heat recovery device compact in the longitudinal direction (flow direction of the exhaust gas).

[0004] An object of the present invention is to provide a compact exhaust heat recovery device.

[0005] According to one embodiment of the present invention, an exhaust heat recovery device for recovering heat of exhaust gas discharged from an engine by heat exchange with a coolant comprises: a first flow path component having a first flow path formed therein for the exhaust gas to flow; a second flow path component arranged adjacent to the first flow path component, having a second flow path formed therein that bypasses a portion of the first flow path, and having a heat exchange portion for performing heat exchange between the exhaust gas flowing in the second flow path and the coolant; a valve unit that switches the opening and closing of the first flow path and the second flow path by rotating a rotating shaft portion arranged in the first flow path component; and a drive portion having a drive shaft for rotating the rotating shaft portion, the second flow path component being arranged to be inclined relative to the flow direction of the exhaust gas in the first flow path, the second flow path component being arranged to be inclined relative to the first flow path component, whereby, in an axial view of the drive shaft of the drive portion, in a region formed on the side of the second flow path component, the drive shaft is extended toward the first flow path component and connected to the rotating shaft portion.

[0006] In this method, the second flow path component is configured to be inclined relative to the flow direction of the exhaust gas in the first flow path. In addition, the second flow path component is configured to be inclined relative to the first flow path component, whereby, in an axial view of the drive shaft of the drive unit, in an area formed on the side of the second flow path component, the drive shaft is extended toward the first flow path component and connected to the rotating shaft portion. As a result, the rotating shaft portion and the drive shaft can be arranged on the upstream side of the flow direction of the exhaust gas in the first flow path. Therefore, the entire exhaust heat recovery device can be made compact in the flow direction of the exhaust gas in the first flow path. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a perspective view of the front side of the exhaust heat recovery device according to the embodiment of the present invention.

[0008] Figure 2 for Figure 1 A top view of the exhaust heat recovery device is shown in FIG.

[0009] Figure 3 for Figure 1 A perspective view of the rear side of the exhaust heat recovery device shown in FIG.

[0010] Figure 4 for Figure 1 A perspective view of the bottom side of the exhaust heat recovery device shown in FIG.

[0011] Figure 5 For use in Figure 4 A diagram for explaining the shaft portion provided on the first flow path member.

[0012] Figure 6 for Figure 1 An exploded perspective view of the exhaust heat recovery device shown in FIG.

[0013] Figure 7 for Figure 2 Schematic diagram of section VII-VII.

[0014] Figure 8 To view from the bottom side Figure 1 The diagram of the exhaust heat recovery device shown in FIG. 1 is a diagram for explaining the valve unit and the drive unit.

[0015] Fig. 9 For Figure 7 Schematic diagram of the exhaust gas flowing in the first flow path.

[0016] Fig.10 For Figure 7 Schematic diagram of the exhaust gas flowing in the second flow path.

[0017] Fig.11 for Figure 2The schematic diagram of the XI-XI cross section of FIG. 1 is a schematic diagram of a state where the exhaust gas flows in the first flow path.

[0018] Fig.12 For Fig.11 Schematic diagram of the exhaust gas flowing in the second flow path. DETAILED DESCRIPTION

[0019] Hereinafter, an exhaust heat recovery device 100 according to an embodiment of the present invention will be described with reference to the drawings.

[0020] First, refer to Figures 1 to 4 , the overall structure of the exhaust heat recovery device 100 is described.

[0021] Figure 1 It is a perspective view of the exhaust heat recovery device 100 from the front side. Figure 2 for Figure 1 FIG. 1 is a top view of the exhaust heat recovery device 100 shown in FIG. Figure 3 for Figure 1 2 is a perspective view of the rear side of the exhaust heat recovery device 100 shown in FIG. Figure 4 for Figure 1 FIG. 1 is a perspective view of the bottom side of the exhaust heat recovery device 100 shown in FIG. Figures 1 to 4 In FIG. 1 , the flow of the exhaust gas in the first flow path member 1 is indicated by arrow A.

[0022] like Figures 1 to 4 As shown, the exhaust heat recovery device 100 includes a first flow path member 1, a second flow path member 2, a heat exchanger 3, an actuator 5 as a driving unit, and a bracket 6. In addition, the exhaust heat recovery device 100 also includes a valve unit 4, which will be described in detail later.

[0023] like Figures 1 to 4 As shown, the first flow path member 1 includes a main body 11 , a first inlet 12 , and a first outlet 13 .

[0024] like Figure 1 As shown, the main body 11 is formed in a substantially rectangular parallelepiped. In the main body 11, a first inlet 12 opens at one end, and a first outlet 13 opens at the other end.

[0025] The first inlet 12 is connected to the upstream side of the exhaust flow path of the engine (not shown). In addition, the first outlet 13 is connected to the downstream side of the exhaust flow path of the engine (not shown). In addition, the main body 11 is a hollow structure through which the exhaust gas can pass, and the details will be described later. Figures 1 to 4 As shown by arrow A in the figure, exhaust gas flowing in from the exhaust flow path of the engine can flow into the main body 11 from the first inlet 12 and flow out from the first outlet 13 to the downstream side of the exhaust flow path (outside the main body 11).

[0026] like Figures 1 to 4 As shown, the second flow path component 2 is formed into a structure connected to the first flow path component 1. The second flow path component 2 is arranged adjacent to the first flow path component 1. The second flow path component 2 has a heat exchange portion 3. The second flow path component 2 is a hollow structure through which exhaust gas can pass, and the details will be described later. In addition, the hollow structure of the second flow path component 2 is connected to the hollow structure of the first flow path component 1, and the exhaust gas flowing into the first flow path component 1 can flow into the second flow path component 2.

[0027] like Figure 1 and Figure 3 As shown, the heat exchange part 3 constitutes a part of the outer periphery of the main body 21. Cooling water as a coolant flows through the inside of the heat exchange part 3, but the coolant (refrigerant) may also be a medium such as a liquid or gas suitable for heat exchange other than cooling water. When the exhaust gas passes through the second flow path member 2, the heat exchange part 3 performs heat exchange between the exhaust gas and the cooling water in the heat exchange part 3. The details of the structure of the heat exchange part 3 will be described later.

[0028] like Figure 3 As shown, in the actuator 5, the main body 52 is inclined and arranged at a position overlapping with a part of the outer peripheral side of the second flow path member 2 and the heat exchange portion 3. In addition, the actuator 5 has a driving shaft 51 extending toward the first flow path member 1 (see Figure 8 ).

[0029] like Figure 4 As shown, the protection frame 6 is provided at a position on the bottom surface side of the second flow path member 2 and the heat exchange portion 3 .

[0030] Then, refer to Figures 5 to 8 And refer to Figures 1 to 4 , details of the structure of the exhaust heat recovery device 100 described above and the valve unit 4 included in the exhaust heat recovery device 100 will be described.

[0031] Figure 5 For use in Figure 4 FIG. 1 is a diagram for explaining the bearing 15 provided in the first flow path member 1. Figure 5 In FIG. 1 , the flow of the exhaust gas in the first flow path member 1 is indicated by arrow A. Figure 6 for Figure 1 1 is an exploded perspective view of the exhaust heat recovery device 100 shown in FIG. Figure 7 for Figure 2 Schematic diagram of section VII-VII. Figure 8 To view from the bottom side Figure 1The exhaust heat recovery device 100 shown in FIG. 1 is a diagram for explaining the valve unit 4 and the actuator 5. Figure 8 In FIG. 1 , the flow of the exhaust gas in the first flow path member 1 is indicated by arrow A.

[0032] First, the details of the structures of the first flow path member 1 and the second flow path member 2 will be described.

[0033] like Figure 7 As shown, the first flow path component 1 is a hollow structure, and a first flow path 14 is formed inside.

[0034] like Figure 7 As shown, the second flow path member 2 comprises a body portion 21, a second inlet 22 and a second outlet 23. The body portion 21 is a hollow structure, and a second flow path 24 is formed inside.

[0035] In the main body 21, the second inlet 22 opens at one end, and the second outlet 23 opens at the other end. In addition, the opening positions of the second inlet 22 and the second outlet 23 can be appropriately changed according to the design of the exhaust heat recovery device 100, and are not limited to Figure 7 The location shown in .

[0036] like Figure 7 As shown, the second inlet 22 is connected to the first flow path member 1 on the side of the first inlet 12. The second outlet 23 is connected to the first flow path member 1 on the side of the first outlet 13. Thus, the first flow path 14 and the second flow path 24 are connected. That is, the exhaust gas flowing into the interior of the main body 11 from the first inlet 12 can flow into the main body 21 from the second inlet 22. In addition, the exhaust gas flowing into the main body 21 from the second inlet 22 can flow out to the main body 11 from the second outlet 23.

[0037] To express the above structure in another way, the second flow path 24 is a member that bypasses a portion of the first flow path 14 (between the second inlet 22 and the second outlet 23 ).

[0038] like Figure 7 As shown, the second inlet 22 and the second outlet 23 are connected to the first flow path component 1 at a position higher than the immersion line W. The immersion line W is a line showing the upper limit of the height of the water surface when water does not flow into the exhaust heat recovery device 100 (in the first flow path 14) when the exhaust heat recovery device 100 is immersed in water. Here, the first inlet 12 and the first outlet 13 have the same height, so the immersion line W is located at the lower end of the first inlet 12 and the first outlet 13. This is because when the height of the water surface exceeds the lower end of the first inlet 12 and the first outlet 13, water will flow from the first inlet 12 and the first outlet 13 into the first flow path 14 inside the exhaust heat recovery device 100.

[0039] The second inlet 22 and the second outlet 23 are located at a position higher than the water immersion line W. Thus, even when water enters the interior of the first flow path member 1 (the first flow path 14), water can be prevented from entering the second flow path 24. That is, a decrease in the heat recovery efficiency between the exhaust gas in the second flow path 24 and the cooling water in the heat exchange unit 3 caused by the water entering the second flow path 24 can be prevented.

[0040] like Figure 7 As shown, the second flow path member 2 is configured to be inclined relative to the first flow path member 1. In detail, the second flow path member 2 is configured to be inclined relative to the flow direction of the exhaust gas in the first flow path 14 flowing from the first inlet 12 to the first outlet 13. In more detail, the second flow path member 2 is configured to be inclined in a manner away from the first flow path 14 in the upward direction from the upstream side (first inlet 12 side) toward the downstream side (first outlet 13 side) of the flow direction of the exhaust gas in the first flow path 14.

[0041] like Figure 5 As shown in FIG. 1 , the second flow path member 2 is integrally joined to the first flow path member 1 without a gap along the first flow path member 1 and is arranged to be inclined relative to the flow direction of the exhaust gas in the first flow path 14, whereby, when viewed from the direction of the drive shaft 51 of the actuator 5 (in the axial view of the drive shaft 51 of the actuator 5), an area S (in the axial direction of the drive shaft 51 of the actuator 5) is formed in an area corresponding to the side of the second flow path member 2 Figure 5 In the region S, a bearing 15 is provided for supporting a rotating shaft portion 43 of the valve unit 4 which will be described later.

[0042] The region S can also be said to be a region surrounded by the lower edge 2a of the second flow path member 2, the lower edge 1a of the first flow path member 1, and the downstream end 1b of the exhaust gas flow direction in the first flow path member 1 when the exhaust heat recovery device 100 is viewed from the extending direction of the drive shaft 51 of the actuator 5 (see Figure 5 ).

[0043] The lower edge portion 2a is a portion including the edge of the bottom surface 2b of the second flow path member 2. That is, the lower edge portion 2a can also be said to be the bottom surface 2b of the second flow path member 2 (see Figure 5 ).

[0044] The lower edge portion 1a is a portion including the edge of the bottom surface 1c of the first flow path member 1. That is, the lower edge portion 1a can also be said to be the bottom surface 1c of the first flow path member 1 (see Figure 5 ).

[0045] The downstream end 1b is a portion including the edge of the side surface 1d on the downstream side of the first flow path member 1 in the exhaust gas flow direction. That is, the downstream end 1b can also be referred to as the side surface 1d on the downstream side of the first flow path member 1 in the exhaust gas flow direction (see Figure 5 ).

[0046] That is, the area surrounded by three planes including each surface (bottom surface 2b of second flow path member 2, bottom surface 1c of first flow path member 1, side surface 1d on the downstream side of exhaust gas flow direction of first flow path member 1) is area S. In addition, area S can also be said to be an area surrounded by bottom surface 2b of second flow path member 2 and side surface 1e of first flow path member 1 (refer to Figure 5 ).

[0047] In other words, the region S can be said to be a region of the outer periphery of the first flow path member 1 on the second flow path member 2 side that is not adjacent to the second flow path member 2. Figure 5 The bearing 15 disposed in the region S can be said to be arranged in parallel with the second flow path member 2 in the vertical direction of the paper (see Figure 5 ). In addition, the position of the bearing 15 may be appropriately changed within the region S according to the size of the exhaust heat recovery device 100.

[0048] Next, details of the components of the heat exchange portion 3 assembled to the second flow path member 2 will be described.

[0049] like Figures 1 to 3 , Figure 5 and Figure 7 As shown, the heat exchange portion 3 has a coolant inflow portion 31, a heat exchanger body portion 32 and a coolant outflow portion 33. Figure 7 As shown, the heat exchange unit 3 is provided at a position higher than the water line W.

[0050] That is, the heat exchange part 3 is disposed at a position where the water surface does not reach even when water enters the exhaust heat recovery device 100 and water enters the first flow path 14. Thus, it is possible to prevent water from entering the heat exchange part 3. Therefore, it is possible to prevent a decrease in the heat recovery efficiency between the exhaust gas in the second flow path 24 and the cooling water in the heat exchange part 3 due to water entering the heat exchange part 3.

[0051] The coolant inlet 31 is a hollow tube-shaped portion that connects a flow path (not shown) through which cooling water that has not yet cooled the engine flows and the interior of the heat exchanger body 32. The coolant inlet 31 allows the cooling water as a coolant supplied from the flow path to flow into the interior of the heat exchanger body 32.

[0052] like Figure 3As shown, the heat exchanger main body 32 constitutes a part of the outer periphery of the main body 21. Cooling water flowing in from the coolant inflow portion 31 flows inside the heat exchanger main body 32.

[0053] The coolant outflow portion 33 is a hollow tube-shaped portion that connects the inside of the heat exchanger body 32 and a flow path (not shown) for supplying cooling water to the engine. The coolant inflow portion 31 allows the cooling water flowing inside the heat exchanger body 32 to flow out to the flow path.

[0054] The heat exchange portion 3 of the above-mentioned structure performs heat exchange between the exhaust gas and the cooling water flowing inside the heat exchanger main body 32 when the exhaust gas flows in the portion surrounded by the heat exchanger main body 32 in the main body 21 of the second flow path component 2 (the portion surrounded by the heat exchanger main body 32 in the second flow path 24), so that the heat of the exhaust gas is transferred to the cooling water and the heat is recovered.

[0055] The second inlet 22 for allowing the exhaust gas to flow into the second flow path 24 and the second outlet 23 for allowing the exhaust gas to flow out of the second flow path 24 are provided at a position higher than the water line W (see Figure 7 ). Thus, water can be prevented from entering the heat exchange unit 3. Therefore, the influence on the flow of the exhaust gas in the second flow path 24 caused by the water entering the heat exchange unit 3 can be prevented. Thus, the decrease in the heat recovery efficiency between the exhaust gas and the cooling water in the heat exchange unit 3 can be prevented.

[0056] Next, the valve unit 4 will be described.

[0057] like Figures 6 to 8 As shown in FIG. 1 , the exhaust heat recovery device 100 includes a valve unit 4. The valve unit 4 includes a butterfly valve 41 and a shutter portion 42. The butterfly valve 41 includes a rotating shaft portion 43 and a valve body 44. Figure 6 As shown, when the divided first flow path member components 1A and 1B are assembled, the valve unit 4 is assembled in the first flow path member 1 .

[0058] like Figure 8 As shown in FIG. 1 , in the valve unit 4, one end (distal end portion) 43a of the rotating shaft portion 43 is supported by the bearing 15. Thus, the valve unit 4 is supported in the first flow path 14 so as to be rotatable.

[0059] like Figure 8 As shown, one end 43a of the rotating shaft portion 43 is oriented toward the outside of the first flow path member 1 (equivalent to Figure 5The one end 43a of the rotating shaft portion 43 is connected to the drive shaft 51 of the actuator 5 to be described later by means of a coupling 50. Specifically, the rotating shaft portion 43 is inserted into the bearing 15, and the one end 43a of the rotating shaft portion 43 protrudes from the front end of the bearing 15. A spring is assembled between the bearing 15 and the coupling 50 so as to surround the one end 43a of the rotating shaft portion 43, and the coupling 50 is pushed upward by the elastic force of the spring. As a result, the claw located at the front end of the drive shaft 51 is inserted into the insertion hole of the coupling 50, and the coupling 50 is connected to the drive shaft 51 while receiving the reaction force of the spring. That is, the rotating shaft portion 43 is rotatably connected to the drive shaft 51 by the mechanism of the coupling 50. In addition, for example, in the present embodiment, the position where the one end 43a of the rotating shaft portion 43 and the drive shaft 51 are connected by means of the coupling 50 is located within the area S (refer to Figure 5 ) In addition, a sealing member is provided at the root of the rotating shaft portion 43 and on the entire periphery between the root of the rotating shaft portion 43 and the bearing 15 to prevent leakage of gas or the like.

[0060] Thus, compared with the case where the rotating shaft portion 43 is entirely disposed in the first flow path member 1, in the rotating shaft portion 43 of the present embodiment, the connection with the drive shaft 51 is performed in the region S, so the range affected by the heat of the exhaust gas flowing in the first flow path 14 becomes smaller. Thus, the influence of the heat of the exhaust gas on the rotating shaft portion 43 (or the drive shaft 51) can be reduced. Therefore, the durability of the exhaust heat recovery device 100 can be improved.

[0061] like Figure 6 and Figure 8 As shown, the valve body 44 of the butterfly valve 41 is provided on the other end 43b side of the rotating shaft portion 43. The valve body 44 of the butterfly valve 41 is a plate-shaped portion formed to be able to close the length and width of the first flow path 14. The valve body 44 rotates together with the rotating shaft portion 43, and opens and closes the first flow path 14 according to the movement position.

[0062] like Figure 6 and Figure 7 As shown, the gate portion 42 is provided on one end 44 a side of the valve body 44 .

[0063] The gate portion 42 is a portion formed in a shape capable of closing the second outlet 23. In the present embodiment, the gate portion 42 includes: a gate body portion 42a formed in a length and width capable of closing the second outlet 23; and a connecting portion 42b connecting the gate body portion 42a and one end 44a of the valve body 44 to support the gate body portion 42a. Figure 6 As shown, in this embodiment, the gate body 42a is supported by two connecting parts 42b. In addition, the number of connecting parts 42b is not limited to Figure 6The number shown is sufficient as long as it can support the gate body 42a. For example, the number of the connecting parts 42b can be one or more than three.

[0064] The gate portion 42 rotates and moves together with the rotation of the valve body 44, and opens and closes the second flow outlet 23 according to the movement position. That is, the valve unit 4 only rotates the rotating shaft portion 43, thereby, the valve body 44 and the gate portion 42 of the butterfly valve 41 can be moved at the same time, and the first flow path 14 and the second flow outlet 23 can be opened and closed. In this way, the number of parts can be reduced compared to the case where the butterfly valve 41 (valve body 44) and the gate portion 42 are rotated and moved by different mechanisms. In addition, it is possible to Fig. 9 The state of the position shown. The details will be described later.) The second flow path 24 is not opened to prevent the exhaust gas from flowing into the second flow path 24, so the performance of the exhaust heat recovery device 100 during non-heat recovery can be improved.

[0065] However, the bearing 15 supporting the rotating shaft portion 43 of the valve unit 4 is provided adjacent to the first flow path member 1 and is arranged to be inclined with respect to the flow direction of the exhaust gas in the first flow path 14. Therefore, when viewed from the direction of the drive shaft 51 of the actuator 5, the bearing 15 is provided in the area S formed on the side of the second flow path member 2 (see Figure 5 ). That is, the rotating shaft portion 43 is also arranged at a position within the region S. The region S is formed by arranging the second flow path member 2 to be inclined relative to the flow direction of the exhaust gas in the first flow path 14. That is, the rotating shaft portion 43 is arranged in the region S, thereby, compared with the case where the second flow path member 2 is not arranged at an inclination, the rotating shaft portion 43 (valve unit 4) can be arranged on the upstream side of the flow direction of the exhaust gas in the first flow path 14. As a result, the entire exhaust heat recovery device 100 can be made compact in the flow direction of the exhaust gas in the first flow path 14.

[0066] In addition, if Figure 8 As shown in FIG. 1 , only one end 43a of the rotating shaft portion 43 is supported by the bearing 15. That is, the rotating shaft portion 43 has a cantilever structure. The one end 43a of the rotating shaft portion 43 supported by the bearing 15 is set to be long so as to be supported by the cantilever structure (see FIG. 1 ). Figure 6 ).

[0067] Thus, compared with the case where the rotating shaft portion 43 is supported on one end 43a and a bearing structure is also provided on the other end 43b side (i.e., the case where the rotating shaft portion 43 is supported at two points instead of a cantilever structure), the rotating shaft portion 43 of this embodiment is affected by the heat of the exhaust gas flowing in the first flow path 14 to a smaller range. Thus, the influence of the heat of the exhaust gas on the valve unit 4 (rotating shaft portion 43) and the bearing 15 can be reduced. Therefore, the durability of the exhaust heat recovery device 100 can be improved.

[0068] Next, the structure of the actuator 5 will be described in detail. Figures 2 to 4 , Figure 6 and Figure 8 As shown, the actuator 5 includes a driving shaft 51 , a body portion 52 , and a connector 53 .

[0069] like Figure 8 As shown, the drive shaft 51 is extended toward the side surface 1e of the first flow path member 1. The drive shaft 51 is connected to the end 43a of the rotating shaft portion 43 in the region S by means of a coupling 50 (see Figure 5 and Figure 8 ) Specifically, the drive shaft 51 is connected in the region S to one end 43 a of the rotating shaft portion 43 that protrudes to the outside of the first flow path member 1 .

[0070] The main body 52 has a mechanism for rotationally driving the drive shaft 51. The connector 53 is connected to a power supply unit (not shown) via an electric wire. The main body 52 rotationally drives the drive shaft 51 based on the power supplied from the power supply unit via the connector 53 and the control of the control unit (not shown).

[0071] When the drive shaft 51 rotates, the rotation shaft portion 43 connected to the drive shaft 51 rotates. According to the rotation of the rotation shaft portion 43, the butterfly valve 41 and the gate portion 42 of the valve unit 4 are rotationally moved.

[0072] like Figure 3 As shown, the main body 52 is configured to sandwich the second flow path component 2 between it and the first flow path component 1. In addition, a portion of the main body 52 is fixed to the shell (outer cover) of the heat exchanger main body 32 assembled to the second flow path component 2, and the other portion is fixed to the protective frame 6. That is, the main body 52 is configured at a position at least away from the first flow path 14. Therefore, by setting the main body 52 at the above-mentioned position, the main body 52 is not easily affected by the heat of the exhaust gas flowing in the first flow path 14. Thereby, the durability of the actuator 5 can be improved. In addition, in the present embodiment, the actuator 5 is set at a position corresponding to the heat exchanger main body 32, thereby preventing the influence of the heat of the exhaust gas flowing in the second flow path component 2. In addition, the actuator 5 can also be fixed only to the heat exchanger main body 32.

[0073] In addition, when the main body 52 is formed to a size that can be accommodated in the area S, the main body 52 can also be arranged in the area S. In this case, the exhaust heat recovery device 100 can be made compact in the direction (lateral direction) orthogonal to the flow direction (length direction) of the exhaust gas in the first flow path 14. Among them, when the main body 52 is arranged in the area S, it is preferred to provide an insulating material or a space at least between the first flow path component 1 and the main body 52. ​​In addition, even in this case, it is preferred to fix the main body 52 at a position corresponding to the heat exchange part 3 in the second flow path component 2. This is to prevent the main body 52 from being affected by the heat of the exhaust gas flowing in the first flow path component 1 and the second flow path component 2.

[0074] In addition, the actuator 5 (main body 52) is arranged at an angle (see Figure 3 and Figure 4 Specifically, the actuator 5 (main body 52) is arranged along the first flow path member 1 with respect to the flow direction of the exhaust gas in the first flow path 14 ( Figure 3 and Figure 4 The arrow A) is tilted.

[0075] According to the above configuration, a portion of the main body 52 is adjacent to the second outlet 23 side of the second flow path member 2 and the outer peripheral surface of the heat exchange portion 3 (see Figure 3 and Figure 4 ).

[0076] The exhaust gas flowing in the second outlet 23 side portion of the second flow path member 2 has been heat recovered by the heat exchange unit 3, so its temperature is low. Therefore, the temperature of the outer peripheral surface of the second flow path member 2 on the second outlet 23 side portion also becomes low. In addition, the temperature of the outer peripheral surface of the heat exchange unit 3 also becomes low due to heat recovery.

[0077] Therefore, by providing the main body 52 at the above position, the influence of the heat of the exhaust gas flowing in the second flow path 24 can be suppressed. As a result, the durability of the actuator 5 can be improved. Therefore, the durability of the exhaust heat recovery device 100 can be improved.

[0078] In addition, if Figure 3 and Figure 4 As shown, the connector 53 is also arranged obliquely. Thus, even if water enters the interior of the connector 53, the connector 53 can discharge the water to the outside. That is, the water will not be retained in the connector 53.

[0079] However, the bearing 15 supporting the rotating shaft portion 43 of the valve unit 4 is provided adjacent to the first flow path member 1 and is arranged to be inclined with respect to the flow direction of the exhaust gas in the first flow path 14. Therefore, when viewed from the direction of the drive shaft 51 of the actuator 5, the bearing 15 is provided in the area S formed on the side of the second flow path member 2 (see Figure 5 That is, the drive shaft 51 connected to the rotating shaft portion 43 is also arranged in the region S (see Figure 5 and Figure 8 ). The region S is formed by arranging the second flow path member 2 to be inclined relative to the flow direction of the exhaust gas in the first flow path 14. That is, the drive shaft 51 is arranged in the region S (in the region S, the drive shaft 51 is connected to the rotating shaft portion 43), thereby, compared with the case where the second flow path member 2 is not arranged at an inclination, the drive shaft 51 and the actuator 5 can be arranged as a whole on the upstream side of the flow direction of the exhaust gas in the first flow path 14. As a result, the exhaust gas in the first flow path 14 can be compact in the flow direction (length direction).

[0080] As described above, the exhaust heat recovery device 100 is a structure in which the drive shaft 51 is extended toward the first flow path member 1 and connected to the rotating shaft portion 43 in the area S formed by configuring the second flow path member 2 to be inclined relative to the first flow path member 1, and the actuator 5 is configured to sandwich the second flow path member 2 between the actuator 5 and the first flow path member 1. By setting the above two structures, the exhaust heat recovery device 100 becomes compact in the flow direction (length direction) of the exhaust gas in the first flow path 14, and at the same time, the influence of the heat of the exhaust gas on the actuator 5 is suppressed to improve the durability of the actuator 5 (and even the durability of the exhaust heat recovery device 100).

[0081] Next, the protection frame 6 will be described.

[0082] like Figure 4 and Figure 6 As shown, the exhaust heat recovery device 100 further includes a protection frame 6, which surrounds the outer side of the drive shaft 51, the bearing 15 and the rotating shaft portion 43. By providing the protection frame 6, the drive shaft 51, the bearing 15 and the rotating shaft portion 43 can be protected from splashing objects such as stepping stones. In this embodiment, the protection frame 6 is provided on the first flow path component 1 (refer to Figure 4 and Figure 6 ). The protection frame 6 may also be provided on the second flow path member 2 .

[0083] Then, refer to Figures 9 to 12 , heat recovery performed using the exhaust heat recovery device 100 having the above-mentioned structure is described.

[0084] Fig. 9 For Figure 7 FIG. 1 is a schematic diagram showing a state where the exhaust gas flows in the first flow path 14 . Fig.10 For Figure 7 FIG. 2 is a schematic diagram showing a state where the exhaust gas flows in the second flow path 24 . Fig.11 for Figure 2 The schematic diagram of the XI-XI cross section of FIG. 1 is a schematic diagram of a state where the exhaust gas flows in the first flow path 14 . Fig.12 For Fig.11 FIG. 2 is a schematic diagram showing a state where the exhaust gas flows in the second flow path 24 .

[0085] First, refer to Figures 9 to 11 , which is a case where heat recovery from the exhaust gas is not required (for example, a case where the engine does not need to be warmed up). In this case, the control unit drives the drive shaft 51 to rotate the rotating shaft portion 43, thereby switching the valve body 44 and the gate portion 42 of the valve unit 4 to Fig. 9 As a result, the valve unit 4 is switched so that the valve body 44 of the butterfly valve 41 opens the first flow path 14 and the gate portion 42 closes the second flow port 23 .

[0086] like Fig. 9 As shown, the first flow path 14 is opened while the second flow outlet 23 is closed, so that the exhaust gas flowing into the exhaust flow path flows from the first flow inlet 12 through the inside of the main body 11 as shown by arrow A and flows out from the first flow outlet 13 to the downstream side of the exhaust flow path (outside the main body 11). Fig.11 As shown, the exhaust gas does not flow in the body portion 21 (in the second flow path 24). Therefore, heat exchange does not occur between the exhaust gas and the cooling water flowing through the heat exchange portion 3. That is, the exhaust gas is discharged to the outside without recovering heat.

[0087] Then, refer to Figures 10 to 12 , which describes a case where heat recovery from exhaust gas is required (for example, a case where the engine needs to be warmed up). In this case, the control unit rotates the drive shaft 51 to rotate the rotating shaft portion 43, thereby switching the valve body 44 and the gate portion 42 of the valve unit 4 to Fig.10 As a result, the valve unit 4 is switched so that the valve body 44 of the butterfly valve 41 closes the first flow path 14 and the gate portion 42 opens the second flow port 23 .

[0088] like Fig.10 As shown, the first flow path 14 is closed and the second flow outlet 23 is opened, whereby the exhaust gas flowing in from the exhaust flow path flows from the first flow inlet 12 through the second flow inlet 22 as shown by arrow B and flows into the main body 21 of the second flow path member 2 (second flow path 24). Fig.12 As shown in FIG. 1 , the exhaust gas flowing into the main body 21 from the second inlet 22 flows in the direction of arrow C. When the exhaust gas flows in the heat exchanger main body 32 in the main body 21, the exhaust gas and the cooling water (along the direction of arrow C) flowing in the heat exchanger 3 are Fig.12 Heat is exchanged between the cooling water flowing in the direction of the dotted arrow X). That is, the cooling water is heated. The heated cooling water flows out from the coolant outflow portion 33 and is supplied to the engine, which can warm up the engine.

[0089] like Fig.10 and Fig.12 As shown by arrows C and D in FIG. 1 , the exhaust gas after heat recovery passes through the second outlet 23 and flows out from the first outlet 13 to the downstream side of the exhaust flow path (outside the main body 11 ).

[0090] According to the above embodiment, the following effects can be achieved.

[0091] An exhaust heat recovery device 100 for recovering heat of exhaust gas discharged from an engine by heat exchange with a coolant comprises: a first flow path member 1, in which a first flow path 14 for the exhaust gas to flow is formed; a second flow path member 2, which is arranged adjacent to the first flow path member 1 and in which a second flow path 24 bypassing a portion of the first flow path 14 is formed, and a heat exchange portion 3 for performing heat exchange between the exhaust gas flowing in the second flow path 24 and the coolant; and a valve unit 4, which is arranged in the first flow path member 1 via a rotating shaft portion 43. by rotating to switch the opening and closing of the first flow path 14 and the second flow path 24; and an actuator 5, which has a drive shaft 51 that rotates the rotating shaft portion 43, and the second flow path component 2 is configured to be inclined relative to the flow direction of the exhaust gas in the first flow path 14, and the second flow path component 2 is configured to be inclined relative to the first flow path component 1, thereby, in an axial view of the drive shaft 51 of the actuator 5, in an area S formed on the side of the second flow path component 2, the drive shaft 51 extends toward the first flow path component 1 and is connected to the rotating shaft portion 43.

[0092] Furthermore, the second flow path member 2 is arranged to be inclined so as to be away from the first flow path 14 from the upstream side toward the downstream side in the flow direction of the exhaust gas in the first flow path 14 .

[0093] Furthermore, in the axial view of the drive shaft 51 of the actuator 5 , the drive shaft 51 is arranged in a region surrounded by the lower edge 2a of the second flow path member 2 , the lower edge 1a of the first flow path member 1 , and the downstream end 1b in the exhaust gas flow direction within the first flow path member 1 .

[0094] According to these structures, the rotating shaft portion 43 (valve unit 4) and the driving shaft 51 (actuator 5) can be arranged on the upstream side of the flow direction of the exhaust gas in the first flow path 14. As a result, the exhaust heat recovery device 100 can be made compact in the flow direction (length direction) of the exhaust gas in the first flow path 14.

[0095] Furthermore, the drive shaft 51 is connected in the region S to one end 43 a of the rotating shaft portion 43 that protrudes to the outside of the first flow path member 1 .

[0096] Furthermore, the rotating shaft portion 43 has a cantilever structure in which only one end 43 a is supported.

[0097] According to these structures, the influence of the heat of the exhaust gas on the valve unit 4 (rotation shaft portion 43) can be reduced. Therefore, the durability of the exhaust heat recovery device 100 can be improved.

[0098] Furthermore, the actuator 5 is arranged with the second flow path member 2 interposed between the actuator 5 and the first flow path member 1 .

[0099] Furthermore, the actuator 5 is arranged along the first flow path 14 so as to be inclined with respect to the flow direction of the exhaust gas in the first flow path 14 .

[0100] According to these structures, the influence of the heat of the exhaust gas on the actuator 5 can be suppressed. That is, the durability of the actuator 5 can be improved. Therefore, the durability of the exhaust heat recovery device 100 can be improved.

[0101] Furthermore, the exhaust heat recovery device 100 further includes a protection frame 6 surrounding the outer side of the drive shaft 51 .

[0102] According to this structure, the drive shaft 51 can be protected from flying objects such as stepping stones.

[0103] In addition, the first flow path member 1 has a first inlet 12 for the exhaust gas to flow in and a first outlet 13 for the exhaust gas flowing in from the first inlet 12 to flow out, and the second flow path member 2 has a second inlet 22 connected to the first flow path member 1 on the side of the first inlet 12 and a second outlet 23 connected to the first flow path member 1 on the side of the first outlet 13. In addition, the valve unit 4 further has a butterfly valve 41 for opening and closing the first flow path 14 and a gate portion 42 for closing the second outlet 23 when the butterfly valve 41 opens the first flow path 14 and opening the second outlet 23 when the butterfly valve 41 closes the first flow path 14.

[0104] According to this structure, the butterfly valve 41 and the gate portion 42 move integrally, thereby opening and closing the first flow path 14 and the second flow outlet 23. That is, compared with the case where the butterfly valve 41 (valve body 44) and the gate portion 42 are rotated and moved by separate mechanisms, the number of components can be reduced. In addition, the second flow path 24 can be prevented from flowing into the second flow path 24 without opening it during non-heat recovery, so the performance of the exhaust heat recovery device 100 during non-heat recovery can be improved.

[0105] Furthermore, the heat exchange unit 3 is provided at a position higher than the water line W located at the lower ends of the first inlet 12 and the first outlet 13 .

[0106] Furthermore, the second inlet 22 and the second outlet 23 are provided at positions higher than the water line W.

[0107] According to these structures, water can be prevented from entering the heat exchange unit 3. Therefore, the influence on the flow of the exhaust gas in the second flow path 24 caused by the water entering the heat exchange unit 3 can be prevented. Thus, the reduction in the heat recovery efficiency between the exhaust gas and the cooling water in the heat exchange unit 3 can be prevented.

[0108] Furthermore, the main body 52 of the actuator (driving unit) 5 is fixed to the outer shell (housing) of the heat exchanger main body 32 in the heat exchange unit 3 .

[0109] According to this structure, the main body 52 of the actuator 5 is not easily affected by the heat of the exhaust gas flowing through the first flow path component 1 and the heat of the exhaust gas flowing through the second flow path component 2, so the durability of the actuator 5 can be ensured. In addition, there is no need to take special heat countermeasures for the actuator 5, thereby reducing costs.

[0110] As mentioned above, although the embodiment of the present invention has been described, the above embodiment merely shows a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific structure of the above embodiment.

[0111] This application claims priority based on Japanese Patent Application No. 2020-094806 filed with the Japan Patent Office on May 29, 2020, and the entire contents of the application are incorporated into this specification by reference.

Claims

1. An exhaust heat recovery device, which recovers heat from exhaust gas exhausted from an engine by heat exchange with a coolant, comprising: a first flow path member having a first flow path formed therein for the exhaust gas to flow; a second flow path member disposed adjacent to the first flow path member, having a second flow path formed therein that bypasses a portion of the first flow path, and having a heat exchange portion for performing heat exchange between the exhaust gas flowing in the second flow path and the coolant; a valve unit that switches opening and closing of the first flow path and the second flow path by rotating a rotating shaft portion disposed in the first flow path member; and a driving unit having a driving shaft for rotating the rotating shaft unit, The second flow path member is arranged to be inclined with respect to the flow direction of the exhaust gas in the first flow path. The second flow path member is arranged to be inclined relative to the first flow path member, whereby, in an axial view of the drive shaft of the drive unit, the drive shaft extends toward the first flow path member in a region formed on the side of the second flow path member and is connected to the rotating shaft portion.

2. The exhaust heat recovery device according to claim 1, wherein: The driving portion is arranged with the second flow path member interposed between the driving portion and the first flow path member.

3. The exhaust heat recovery device according to claim 1 or 2, wherein: The driving shaft is connected to one end of the rotating shaft portion protruding to the outside of the first flow path member in the region.

4. The exhaust heat recovery device according to any one of claims 1 to 3, wherein: The second flow path member is arranged to be inclined so as to be away from the first flow path from the upstream side toward the downstream side in the flow direction of the exhaust gas in the first flow path.

5. The exhaust heat recovery device according to any one of claims 1 to 3, wherein: The second flow path member is arranged to be inclined from the upstream side toward the downstream side in the flow direction of the exhaust gas in the first flow path and to be away from the first flow path in the upward direction. In an axial view of the drive shaft of the drive unit, the drive shaft is arranged in a region surrounded by a lower edge of the second flow path member, a lower edge of the first flow path member, and a downstream end of the first flow path member in the exhaust gas flow direction.

6. The exhaust heat recovery device according to any one of claims 1 to 5, wherein: The rotating shaft portion is a cantilever structure with only one end supported.

7. The exhaust heat recovery device according to any one of claims 1 to 6, wherein: The driving unit is arranged along the first flow path member so as to be inclined with respect to the flow direction of the exhaust gas in the first flow path.

8. The exhaust heat recovery device according to any one of claims 1 to 7, further comprising: A protection frame surrounds the outer side of the drive shaft.

9. The exhaust heat recovery device according to any one of claims 1 to 8, wherein: The first flow path member has a first inlet through which the exhaust gas flows in and a first outlet through which the exhaust gas flowing in from the first inlet flows out. The second flow path member has a second inlet connected to the first flow path member on the first inlet side and a second outlet connected to the first flow path member on the first outlet side. The valve unit also has: a butterfly valve for opening and closing the first flow path; and The gate portion closes the second outflow port when the butterfly valve opens the first flow path, and opens the second outflow port when the butterfly valve closes the first flow path.

10. The exhaust heat recovery device according to any one of claims 1 to 8, wherein: The first flow path member has a first inlet through which the exhaust gas flows in and a first outlet through which the exhaust gas flowing in from the first inlet flows out. The second flow path member has a second inlet connected to the first flow path member on the first inlet side and a second outlet connected to the first flow path member on the first outlet side. The heat exchange portion is provided at a position higher than a water immersion line at lower ends of the first inlet and the first outlet.

11. The exhaust heat recovery device according to claim 10, wherein: The second inlet and the second outlet are provided at positions higher than the water immersion line.

12. The exhaust heat recovery device according to any one of claims 1 to 11, wherein: The main body of the driving part is fixed to the heat exchanger main body in the heat exchange part.

Images