JP2017193972A - Exhaust heat recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust heat recovery device capable of suppressing boiling of a cooling medium due to heating by exhaust gas by controlling flowing of the cooling medium.SOLUTION: In an exhaust heat recovery device 1, a number of communication holes 15 are formed in an inner tube 10 to introduce exhaust gas G from a bypass passage 11 in the inside of the inner tube 10 to an annular heat exchange passage 21 lying between the inner tube 10 and an outer tube 20 when the bypass passage 11 is closed, and an annular cooling medium passage 35 having a cooling medium inlet pipe 36 and a cooling medium outlet pipe is provided on the outer peripheral side of the outer tube 20. In at least one of the cooling medium inlet pipe 36 and the cooling medium outlet pipe, a control member 38 is provided for controlling a cooling medium W such that the same flows to a part H side of the annular cooling medium passage 35, which faces a gas introduction side of the exhaust gas G.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an exhaust heat recovery device (exhaust heat recovery device) that recovers heat discharged together with exhaust gas from an engine or combustion equipment.

  For example, an exhaust heat recovery device that recovers heat of exhaust gas discharged from an engine is known as described in Patent Document 1.

  As shown in FIG. 11, the exhaust heat recovery apparatus 100 includes an inner cylinder 110 that forms a first exhaust passage 111 as a bypass passage through which exhaust gas G flows, and an outer cylinder that is disposed on the outer peripheral side of the inner cylinder 110. 120, the intermediate cylinder 130 forming the annular second exhaust passage 121 as a heat exchange passage between the inner cylinder 110 and the outer cylinder 120, and the heat of the exhaust gas G flowing through the annular second exhaust passage 121 are circulated. An annular cooling medium passage 140 formed between the outer cylinder 120 and the intermediate cylinder 130 so as to be transmitted to a cooling medium (for example, cooling water) W, and a cooling medium provided at one end and the other end of the outer cylinder 120 The exhaust gas G formed in the circumferential direction on the upstream side of the inner cylinder 110 and the introduction port 125 and the cooling medium outlet port 126 is introduced into the upstream end of the first exhaust passage 111 from the first exhaust passage 111 in an annular shape. 2 exhaust passage 12 Are provided on the downstream side of the first exhaust passage 111, and the exhaust gas G is circulated through the first exhaust passage 111 in an open state, and the exhaust gas G is closed in a closed state. And a valve body 150 that circulates to the annular second exhaust passage 121 through a large number of communication holes 115.

  When the heat is recovered, the valve body 150 is closed, and the exhaust gas G flows through the plurality of communication holes 115 of the inner cylinder 110 into the annular second exhaust passage 121 and flows into the cooling medium introduction port 125. The medium W exchanges heat with the exhaust gas G while flowing through the annular cooling medium passage 140, and heat is recovered by flowing out of the cooling medium outlet port 126 with heat.

  A spiral groove-like unevenness 131 is provided on the surface of the intermediate cylinder 130 on the second exhaust passage 121 side where the annular second exhaust passage 121 as the heat exchange passage and the cooling medium passage 140 are in contact with each other, thereby increasing the heat exchange area. Wide.

JP 2006-250524 A JP 2008-128128 A

  In the conventional exhaust heat recovery apparatus 100 described above, the communication holes 115 for introducing the exhaust gas G from the first exhaust passage 111 to the annular second exhaust passage 121 are equally spaced over the entire circumference of the inner cylinder 110. Therefore, a large amount of high-temperature exhaust gas G also flows in the direction in which the cooling medium outlet port 126 exists, and the cooling medium W is heated excessively in the vicinity of the cooling medium outlet port 126 and boils. It was easy, and the low temperature cooling medium W could not be made to flow positively to the portion that easily boiled (exhaust gas G introduction side). Further, since the annular cooling medium passage 140 is narrow in the passage, it is difficult to control the flow of the cooling medium W by providing inclined plates and ribs in the passage.

  In view of the above circumstances, an object of the present invention is to provide an exhaust heat recovery apparatus that can control boiling of a cooling medium due to heating of exhaust gas by controlling the flow of the cooling medium.

  In order to solve the above-mentioned problems, the invention of claim 1 is directed to an exhaust heat recovery device that recovers exhaust heat by transferring heat of exhaust gas to a cooling medium through a heat transfer member. An inner pipe that forms a bypass passage, and an outer pipe that is arranged on the outer circumference side of the inner pipe and that forms an annular heat exchange passage between the outer circumference of the inner pipe, and an annular heat exchange passage, An annular heat transfer member for receiving heat from the exhaust gas flowing in the axial direction through the annular heat exchange passage, and the annular heat transfer so as to transfer the heat received by the annular heat transfer member to a circulating cooling medium. An annular cooling medium passage disposed on the outer peripheral side of the member and formed on the outer peripheral side of the outer tube, and a cooling medium inlet pipe and a cooling medium provided at different positions in the circumferential direction of the annular cooling medium passage An outlet pipe and a pipe wall on the upstream side of the inner pipe, The exhaust gas introduced into the upstream end of the bypass passage is provided on the downstream side of the bypass passage with a large number of communication holes through which the exhaust gas can be introduced from the bypass passage to the upstream side of the annular heat exchange passage. An open / close valve that circulates exhaust gas through the bypass passage and circulates the exhaust gas through the communication hole to the annular heat exchange passage in a closed state, and includes at least one of the cooling medium inlet pipe and the cooling medium outlet pipe. On the other hand, a control member for controlling the cooling medium so as to flow to a portion of the annular cooling medium passage facing the gas introduction side of the exhaust gas is provided.

  A second aspect of the present invention is the exhaust heat recovery apparatus according to the first aspect, wherein the control member has an inclined portion on a side of the annular cooling medium passage facing the gas introduction side of the exhaust gas. It is characterized by being formed with a cylindrical tube material.

  A third aspect of the present invention is the exhaust heat recovery apparatus according to the first aspect, wherein the control member has an inverted U shape on a side of the annular cooling medium passage facing the gas introduction side of the exhaust gas. It is characterized by being formed of a tubular tube material having a notch.

  A fourth aspect of the present invention is the exhaust heat recovery apparatus according to the first aspect, wherein the control member has an opening on a side of the annular cooling medium passage facing the gas introduction side of the exhaust gas. It is characterized by being formed of a semi-cylindrical tube material.

  A fifth aspect of the present invention is the exhaust heat recovery apparatus according to any one of the second to fourth aspects, wherein the control member has the annular shape of at least one of the cooling medium inlet pipe and the cooling medium outlet pipe. It is characterized in that the end of the cooling medium passage side is integrally formed by extending in a cylindrical shape.

  According to the first aspect of the present invention, the cooling medium is supplied to at least one of the cooling medium inlet pipe and the cooling medium outlet pipe provided at different positions in the circumferential direction of the annular cooling medium passage. By providing a control member that controls the gas introduction side so as to flow toward the opposite side, it is possible to control the flow of the cooling medium and suppress boiling of the cooling medium due to heating of the exhaust gas.

  According to the second aspect of the present invention, the control member is formed of a tubular tube member having an inclined portion on the side of the annular cooling medium passage facing the exhaust gas introduction side. With a simple structure that only forms the inclined portion, the low-temperature cooling medium can be controlled to flow toward the portion that is likely to boil.

  According to the invention of claim 3, the control member is formed of a tubular tube having an inverted U-shaped notch on the side of the annular coolant passage facing the exhaust gas introduction side. Thus, it is possible to control the low-temperature cooling medium to flow to the portion where it is likely to boil with a simple structure in which the control member is simply formed with an inverted U-shaped notch.

  According to the invention of claim 4, the control member is formed of a semi-cylindrical tube member having an opening on the side of the annular cooling medium passage facing the exhaust gas introduction side. With a simple structure that merely forms an opening, it is possible to control the low-temperature cooling medium to flow toward the portion that is likely to boil.

  According to the invention of claim 5, the control member is formed integrally by extending the end portion of at least one of the cooling medium inlet pipe and the cooling medium outlet pipe on the annular cooling medium passage side into a cylindrical shape. A control member can be provided easily and at low cost on at least one of the inlet pipe and the cooling medium outlet pipe.

It is a side view of the exhaust heat recovery device of a 1st embodiment of the present invention. It is A arrow directional view of FIG. It is sectional drawing which follows the BB line in FIG. (A) is a fragmentary sectional view of the periphery of the cooling medium inlet pipe of the exhaust heat recovery apparatus, and (b) is a perspective view of the main part of the cooling medium inlet pipe. It is sectional drawing which follows the CC line in FIG. It is a fragmentary sectional view around the cooling medium inlet pipe of the second embodiment of the present invention. It is a perspective view of the principal part of the cooling-medium inlet pipe of the said 2nd Embodiment. It is a fragmentary sectional view around the cooling medium inlet pipe of the third embodiment of the present invention. It is a perspective view of the principal part of the cooling medium inlet pipe of the said 3rd Embodiment. It is sectional drawing which follows the CC line in FIG. 3 of 4th Embodiment of this invention. It is sectional drawing of the conventional exhaust heat recovery apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a side view of the exhaust heat recovery apparatus according to the first embodiment, FIG. 2 is a view taken along the arrow A in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4B is a perspective view of the main part of the cooling medium inlet pipe, and FIG. 5 is a sectional view taken along the line CC in FIG.

  This exhaust heat recovery device (exhaust heat recovery device) 1 is provided in the middle of an exhaust pipe (not shown) through which exhaust gas G flows from the upstream side toward the downstream side. As shown in FIGS. The pipe 10, the outer pipe 20, the cooling medium jacket member 30, the on-off valve 16, the downstream communication pipe 50, the mounting flanges 18 and 53, and the like.

  As shown in FIG. 3, the inner pipe 10 is composed of a small-diameter circular pipe that forms a bypass passage 11 through which the exhaust gas G flows. A large-diameter upstream communication pipe 12 is connected to the upstream side via a taper portion 13. It is integrally formed. An upstream attachment flange 18 for connecting to the exhaust pipe is joined to the upstream end of the upstream communication pipe 12 by welding.

  Further, exhaust gas G introduced to the upstream end of the bypass passage 11 can be introduced from the bypass passage 11 to the upstream side of an annular heat exchange passage 21 described later on the entire circumference of the pipe wall on the upstream side of the inner pipe 10. A large number of communication holes 15 are provided.

  Further, at the downstream end of the inner pipe 10 constituting the bypass passage 11, the exhaust gas G is circulated through the bypass passage 11 in an open state, and the exhaust gas G is passed through the communication hole 15 in a closed state to form an annular heat exchange passage. An on-off valve 16 is provided at 21 as shown by the solid line arrow in FIG. The on-off valve 16 is attached to a downstream communication pipe 50, which will be described later, via a support shaft 17, and can be opened and closed by an electric control actuator (not shown). The on-off valve 16 may be opened and closed by another actuator such as a cooling medium temperature sensing actuator or an exhaust pressure sensing actuator.

  As shown in FIGS. 3 and 5, the outer tube 20 is disposed concentrically on the outer peripheral side of the inner tube 10, and an annular heat exchange passage 21 is formed between the outer tube 20 and the outer peripheral surface 10 b of the inner tube 10. . That is, the outer tube 20 is formed of a circular tube having a larger diameter than the inner tube 10, and includes an annular heat transfer member 22 provided integrally with the outer tube 20 on the inner peripheral surface 20 a. The heat transfer member 22 is formed in an annular shape with a circular cross section, and has a hollow portion 22a with a circular cross section through which the inner tube 10 is inserted. The annular heat transfer member 22 is disposed substantially at the center of the annular heat exchange passage 21 and serves to receive heat from the exhaust gas G flowing in the axial direction through the annular heat exchange passage 21. . As the annular heat transfer member 22, a honeycomb structure in which a large number of cells penetrating in the axial direction are defined by heat transfer partitions, a fin structure in which a large number of fins are radially arranged, or the like is used.

  Further, the outer tube 20 is integrally provided with a cooling medium jacket member 30 on the outer peripheral side thereof. The cooling medium jacket member 30 has an annular bulging portion 31 and straight pipe portions 32 and 33 on the upstream side and the downstream side thereof, and a circular shape is provided between the annular bulging portion 31 and the outer tube 20. An annular cooling medium passage 35 is formed. The annular cooling medium passage 35 is arranged on the outer peripheral side of the annular heat transfer member 22 so that the heat received by the heat transfer member 22 can be effectively transferred to the cooling medium (for example, coolant) W flowing therethrough. Is provided. The axial length of the annular cooling medium passage 35 corresponds to the axial length of the annular heat transfer member 22.

  The outer tube 20 and the cooling medium jacket member 30 are fixed by welding the end of the straight tube portion 32 of the cooling medium jacket member 30 to the upstream connecting tube 12 via an annular plate-like support plate 41 and cooled. An end of the straight pipe portion 33 of the medium jacket member 30 is fixed by welding in a downstream communication pipe 50 described later, and an end of the inner pipe 10 is fixed to the downstream communication pipe 50 by welding. By supporting the support plate 42 so as to be freely inserted (slidable), the elongation due to heat of the inner tube 10 is absorbed. Although the upstream side support plate 41 is configured as a blocking plate, the downstream side support plate 42 is formed with an opening hole 43 for allowing the exhaust gas G to flow therethrough.

  A downstream communication pipe 50 is connected to the downstream ends of the outer pipe 20 and the cooling medium jacket member 30, and a downstream end of a small-diameter communication pipe 52 provided on the downstream side of the downstream communication pipe 50 via a tapered portion 51. A downstream mounting flange 53 for connecting to the exhaust pipe is joined by welding.

  As shown in FIGS. 3 and 5, a pair of mounting holes 31 a and 31 b are formed in a circular shape on the peripheral wall of the annular bulging portion 31 of the cooling medium jacket member 30 with a predetermined distance therebetween. A cylindrical cooling medium inlet pipe 36 and a cylindrical cooling medium outlet pipe 37 are attached to the mounting holes 31a and 31b, respectively. The cooling medium inlet pipe 36 and the cooling medium outlet pipe 37 are arranged at different positions in the circumferential direction of the annular cooling medium passage 35 (positions separated in the circumferential direction by 90 ° in the illustrated example). In addition, since the high-temperature exhaust gas G flows to the side where the cooling medium outlet pipe 37 exists and bubbles may be generated in the vicinity of the cooling medium outlet pipe 37 due to excessive heating (boiling) of the cooling medium W, the bubbles are generated. From the viewpoint of discharging the bubbles at the time of generation, it is better to provide a cooling medium outlet pipe 37 on the upper part of the cooling medium jacket member 30 as shown in FIG.

  As shown in FIGS. 3, 4 (a) and 4 (b), the low-temperature cooling medium W is exhausted from the cooling medium passage 35 at the end 36 a of the cylindrical cooling medium inlet pipe 36 on the cooling medium passage 35 side. A control member 38 is provided for controlling the gas G to flow to the side opposite to the gas introduction side (portion where the cooling medium W is likely to boil) H. The control member 38 is integrally formed with the end portion 36a by further extending the end portion 36a of the cylindrical cooling medium inlet pipe 36 into a cylindrical shape. That is, the control member 38 is formed of a cylindrical tube material that is integral with the end 36 a of the cooling medium inlet pipe 36, and is a portion H that faces the gas introduction side of the exhaust gas G in the annular cooling medium passage 35. An inclined portion 38b is provided on the side. As shown in FIG. 4A, the inclined portion 38b is formed by connecting a cylindrical tube material formed integrally with the end portion 36a of the cooling medium inlet pipe 36 from the distal end portion 38a to the flange portion 36b of the cooling medium inlet pipe 36. It is formed by cutting obliquely toward the side. The inclined portion 38b of the control member 38 is directed to the portion H side opposite to the gas introduction side of the exhaust gas G in the annular cooling medium passage 35, so that the low-temperature cooling supplied from the cooling medium inlet pipe 36 is achieved. The medium W flows to a portion H side facing the gas introduction side of the exhaust gas G in the annular cooling medium passage 35.

  Further, as shown in FIG. 4A, a gap t is formed between the distal end portion 38a of the control member 38 and the outer peripheral surface 20b of the outer tube 20. As shown in FIGS. 4A and 5, the cooling medium inlet pipe 36 has its end 36a fitted into the mounting hole 31a of the bulging portion 31 of the cooling medium jacket member 30, and the flange 36b bulged. It is fixed to the cooling medium jacket member 30 by welding to the portion 31. Further, as shown in FIG. 5, the cooling medium outlet pipe 37 has its end portion 37 a fitted into the mounting hole 31 b of the bulging portion 31 of the cooling medium jacket member 30, and the flange portion 37 b is welded to the bulging portion 31. And is fixed to the cooling medium jacket member 30.

  Next, the operation will be described.

  When the on-off valve 16 of the exhaust heat recovery apparatus 1 is open, the exhaust gas G flows through the bypass passage 11 and reaches the downstream side. When the on-off valve 16 is open, the exhaust gas G does not flow from the bypass passage 11 to the annular heat exchange passage 21, so that the heat of the exhaust gas G is transferred to the annular heat transfer member 22. There is no. Therefore, the heat of the exhaust gas G is transferred to the cooling medium W flowing through the annular cooling medium passage 35 and is not recovered.

  On the other hand, when the on-off valve 16 of the exhaust heat recovery device 1 is closed, the exhaust gas G flows from the bypass passage 11 to the annular heat exchange passage 21 as shown by the solid line arrow in FIG. It flows to the downstream side communication pipe 50 through the opening hole 43 of 42. During this time, the heat of the exhaust gas G is transferred to the annular heat transfer member 22, and the heat transferred to the annular heat transfer member 22 is transferred to the annular cooling medium passage as shown in FIG. It is transmitted to the cooling medium W flowing through 35 and collected.

  At this time, as shown in FIG. 5, an annular heat transfer member 22 having a hollow portion 22a through which the inner tube 10 is inserted in the center portion defined a large number of cells penetrating in the axial direction with heat transfer partitions. In the case of the honeycomb structure, the annular heat transfer member 22 can efficiently receive the heat of the exhaust gas G without hindering the flow of the exhaust gas G flowing through the annular heat exchange passage 21. The heat recovery efficiency can be improved.

  According to the exhaust heat recovery apparatus 1, the control member 38 is formed by a cylindrical tube material integral with the end portion 36 a of the cooling medium inlet pipe 36, and the control member 38 is an exhaust gas G in the annular cooling medium passage 35. Since the inclined portion 38b is provided on the portion H side opposite to the gas introduction side, the low-temperature cooling medium W supplied from the cooling medium inlet pipe 36 is the gas of the exhaust gas G in the annular cooling medium passage 35. The flow is controlled so as to flow to the part H side opposite to the introduction side. That is, it is possible to control the low-temperature cooling medium W to flow toward the portion H where it is likely to boil with a simple structure in which the inclined portion 38b is formed in the control member 38. Thereby, since the cooling medium W that is easily boiled by the heating of the exhaust gas G is cooled by the low-temperature cooling medium W, the boiling of the cooling medium W due to the heating of the exhaust gas G can be reliably suppressed.

  Further, as shown in FIG. 4A, the inclined portion 38b of the control member 38 is directed to the portion H side opposite to the gas introduction side of the exhaust gas G in the annular cooling medium passage 35, so that the low temperature is reduced. By controlling the cooling medium W to flow to the portion H side facing the gas introduction side of the exhaust gas G in the annular cooling medium passage 35, the cooling medium flow rate on the gas introduction side of the annular cooling medium passage 35 is controlled. Therefore, boiling of the cooling medium W due to heating of the exhaust gas G can be reliably suppressed.

  Further, the end portion 36a of the cooling medium inlet pipe 36 is extended in a cylindrical shape, and the control member 38 is integrally formed with the end portion 36a. Can be provided.

  FIG. 6 is a partial cross-sectional view around the cooling medium inlet pipe of the exhaust heat recovery apparatus of the second embodiment, and FIG. 7 is a perspective view of the main part of the cooling medium inlet pipe.

  In the second embodiment, the control member 38 has a cooling medium inlet having an inverted U-shaped notch 38c on the portion H side opposite to the gas introduction side of the exhaust gas G in the annular cooling medium passage 35. It is formed of a cylindrical tube material integral with the end portion 36 a of the tube 36. Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the second embodiment, the inverted U-shaped notch 38c of the control member 38 is directed to the portion H side facing the gas introduction side of the exhaust gas G in the annular cooling medium passage 35. Since the low-temperature cooling medium W supplied from the cooling medium inlet pipe 36 can be controlled to flow to the portion H side opposite to the gas introduction side of the exhaust gas G in the annular cooling medium passage 35, As in the first embodiment, boiling of the cooling medium W due to heating of the exhaust gas G can be reliably suppressed.

  FIG. 8 is a partial cross-sectional view of the vicinity of the cooling medium inlet pipe of the exhaust heat recovery apparatus of the third embodiment, and FIG. 9 is a perspective view of the main part of the cooling medium inlet pipe.

  In the third embodiment, the control member 38 includes an end portion 36a of the cooling medium inlet pipe 36 having an opening 38d on the portion H side facing the gas introduction side of the exhaust gas G in the annular cooling medium passage 35. And is formed of a semi-cylindrical tube material. Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the third embodiment, the opening 38 d of the control member 38 is directed to the portion H side facing the gas introduction side of the exhaust gas G in the annular cooling medium passage 35, whereby the cooling medium inlet pipe 36. It is possible to control the low-temperature cooling medium W supplied from the refrigerant to flow to the portion H side opposite to the gas introduction side of the exhaust gas G in the annular cooling medium passage 35. Similarly, boiling of the cooling medium W due to heating of the exhaust gas G can be reliably suppressed.

  FIG. 10 is a sectional view taken along the line CC in FIG. 3 of the fourth embodiment.

  In the fourth embodiment, control members 38 each having an inclined portion 38b are integrally formed at each end portion 36a, 37a of both the cooling medium inlet pipe 36 and the cooling medium outlet pipe 37. Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the fourth embodiment, the inclined portion 38b of each control member 38 is directed to the portion H side opposite to the gas introduction side of the exhaust gas G in the annular cooling medium passage 35, so that the cooling medium inlet port Control is performed so that the low-temperature cooling medium W supplied from the pipe 36 and flowing out to the cooling medium outlet pipe 37 flows to the portion H side opposite to the gas introduction side of the exhaust gas G in the annular cooling medium passage 35. Therefore, similarly to the first embodiment, boiling of the cooling medium W due to heating of the exhaust gas G can be reliably suppressed.

  In each of the embodiments described above, the control member is provided in the cooling medium inlet pipe, or the control member is provided in both the cooling medium inlet pipe and the cooling medium outlet pipe. However, the control is performed only on the cooling medium outlet pipe. A member may be provided. In this case, it is possible to reliably suppress the generation of bubbles due to excessive heating (boiling) of the cooling medium in the vicinity of the cooling medium outlet pipe.

DESCRIPTION OF SYMBOLS 1 Exhaust heat recovery apparatus 10 Inner pipe 11 Bypass path 15 Communication hole 16 On-off valve 20 Outer pipe 21 Annular heat exchange path (annular heat exchange path)
22 Annular heat transfer member (annular heat transfer member)
35 Annular coolant passage (annular coolant passage)
36 Cooling medium inlet tube 36a End portion 37 Cooling medium outlet tube 37a End portion 38 Control member 38b Inclined portion 38c Inverted U-shaped cutout portion 38d Opening portion G Exhaust gas W Cooling medium H Gas exhaust gas introduction into cooling medium passage Opposite side (part where cooling medium is likely to boil)

Claims (5)

In the exhaust heat recovery device (1) for recovering the exhaust heat by transferring the heat of the exhaust gas (G) to the cooling medium (W) through the heat transfer member (22),
An inner pipe (10) forming a bypass passage (11) through which the exhaust gas (G) flows;
An outer pipe (20) disposed on the outer peripheral side of the inner pipe (10) and forming an annular heat exchange passage (21) with the outer circumference of the inner pipe (10);
An annular heat transfer member (22) disposed in the annular heat exchange passage (21) and receiving heat from exhaust gas (G) flowing in the axial direction through the annular heat exchange passage (21);
It arrange | positions at the outer peripheral side of the said annular heat-transfer member (22) so that the heat received by the said annular heat-transfer member (22) may be transmitted to the circulating cooling medium (W), and the said outer tube (20) ) An annular cooling medium passage (35) formed on the outer peripheral side of
A cooling medium inlet pipe (36) and a cooling medium outlet pipe (37) provided at different positions in the circumferential direction of the annular cooling medium passage (35);
Exhaust gas (G) drilled in the upstream pipe wall of the inner pipe (10) and introduced into the upstream end of the bypass passage (11) is transferred from the bypass passage (11) to the annular heat exchange passage ( 21) a number of communication holes (15) that can be introduced upstream of
Provided downstream of the bypass passage (11), the exhaust gas (G) flows through the bypass passage (11) in an open state, and the exhaust gas (G) passes through the communication hole (15) in a closed state. An on-off valve (16) that circulates in the annular heat exchange passage (21),
The cooling medium (W) is placed on at least one of the cooling medium inlet pipe (36) and the cooling medium outlet pipe (37) on the gas introduction side of the exhaust gas (G) in the annular cooling medium passage (35). An exhaust heat recovery apparatus, characterized in that a control member (38) is provided for controlling the flow so as to flow toward the opposite part (H). An exhaust heat recovery device (1) according to claim 1,
The control member (38) is a tubular tube member having an inclined portion (38b) on a portion (H) side facing the gas introduction side of the exhaust gas (G) of the annular cooling medium passage (35). An exhaust heat recovery device, characterized in that it is formed by. An exhaust heat recovery device (1) according to claim 1,
The control member (38) has an inverted U-shaped notch (38c) on the side (H) of the annular cooling medium passage (35) facing the gas introduction side of the exhaust gas (G). An exhaust heat recovery apparatus, characterized in that the exhaust heat recovery apparatus is formed of a cylindrical tubular material. An exhaust heat recovery device (1) according to claim 1,
The control member (38) has a semi-cylindrical shape having an opening (38d) on the side (H) of the annular cooling medium passage (35) facing the gas introduction side of the exhaust gas (G). An exhaust heat recovery device, characterized by being formed of a tube material. An exhaust heat recovery device (1) according to any one of claims 2 to 4,
The control member (38) has a cylindrical end (36a, 37a) on the annular cooling medium passage (35) side of at least one of the cooling medium inlet pipe (36) and the cooling medium outlet pipe (37). An exhaust heat recovery device, wherein the exhaust heat recovery device is formed integrally with the exhaust heat.

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