JP2013213424A - Exhaust gas heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas heat exchanger having a structure capable of improving the heat exchange efficiency of an exhaust gas by a refrigerant even if a center shaft direction in an exhaust gas introduction pipe provided in the exhaust gas heat exchanger tilts to a direction in which an exhaust gas path in the exhaust gas heat exchanger extends.SOLUTION: Regarding an exhaust gas heat exchanger 100, one end T1 of a refrigerant guide member 190 is located on the side of an exhaust gas outlet ER2 from a refrigerant introduction port CR1 near the refrigerant introduction port CR1, and the other end T2 of the refrigerant guide member 190 is located on the side of the exhaust gas introduction port ER1 from the refrigerant introduction port CR1 and in a region overlapped with opening projection of an exhaust gas introduction pipe 121.

Description

  The present invention relates to a structure of an exhaust gas heat exchanger that performs heat exchange between an exhaust gas generated by combustion and a refrigerant using water, gas, or the like.

  As prior art documents disclosing exhaust gas heat exchangers, Japanese Patent Application Laid-Open No. 2004-177060 (Patent Document 1), Japanese Patent Application Laid-Open No. 2003-090693 (Patent Document 2), Japanese Patent Application Laid-Open No. 2006-20787 (Patent Document 3) And JP 2010-190064 (Patent Document 4).

  Patent Document 1 discloses an exhaust gas heat exchanger in which protrusions are formed on the surface of a flat pipe disposed inside a casing so that cooling water flows evenly.

  Patent Document 2 discloses an exhaust heat exchanger that diverts cooling water by providing ribs on the surface of a flat pipe disposed inside a tank.

  In Patent Document 3, a plurality of flat plates are folded to form a cooling water passage and an exhaust gas passage, and a plurality of dimples (convex portions) are formed so as to protrude into the cooling water passage. A heat exchanger for circulating cooling water is disclosed.

  In Patent Document 4, a rectifying unit for preventing the cooling water introduced into the EGR gas cooler from flowing out at the shortest distance in the gas exchange unit is provided so as to extend from the cooling water inflow unit side to the opposite side. ing.

JP 2004-177060 A Japanese Patent Laid-Open No. 2003-090693 JP 2006-208787 A JP 2010-190064 A

  When an exhaust gas heat exchanger is to be installed around the engine, the central axis direction of the exhaust gas introduction pipe provided in the exhaust gas heat exchanger is aligned with the exhaust gas in the exhaust gas heat exchanger due to mounting restrictions such as the installation space. In some cases, the direction of the central axis of the exhaust gas introduction pipe is not parallel to the direction in which the passage extends and is inclined with respect to the direction in which the exhaust gas passage in the exhaust gas heat exchanger extends.

  As described above, when the exhaust gas introduction pipe is provided in the exhaust gas heat exchanger in a state where the central axis direction of the exhaust gas introduction pipe is inclined, a high temperature is generated inside the exhaust gas passage of the exhaust gas heat exchanger. Of the exhaust gas drifts, the contact area with the coolant such as cooling water decreases, and the exhaust gas cannot be efficiently cooled.

  This is because “the main flow of exhaust gas” generated in the exhaust gas passage due to the drift of the exhaust gas and the “refrigerant of refrigerant” rectified by the guide member provided in the cooling water passage disclosed in the above-mentioned prior art document. This is because the route with respect to the “main flow” is different, and there are few opportunities for contact between the exhaust gas and the refrigerant, so that efficient heat exchange is hindered.

  Therefore, the present invention has been made in view of the above problems, and due to mounting restrictions such as the arrangement space, the central axis direction of the exhaust gas introduction pipe provided in the exhaust gas heat exchanger is the exhaust gas in the exhaust gas heat exchanger. Even if it is a case where it inclines with respect to the direction where a channel | path extends, it aims at providing an exhaust-gas heat exchanger provided with the structure which can improve the heat exchange efficiency of the exhaust gas by a refrigerant | coolant.

  In the exhaust gas heat exchanger according to one aspect based on the present invention, the exhaust gas heat exchanger is partitioned into an exhaust gas passage and a refrigerant passage, the exhaust gas is introduced into the exhaust gas passage, the refrigerant is introduced into the refrigerant passage, An exhaust gas heat exchanger that cools the exhaust gas by exchanging heat between the exhaust gas and the refrigerant, and includes the following configuration.

  A case in which the exhaust gas passage and the refrigerant passage are formed; an exhaust gas inlet pipe connected to the case for introducing the exhaust gas into the exhaust gas passage; and a case connected to the case; An exhaust gas outlet pipe led out from the exhaust gas passage.

  A refrigerant introduction path connected to the case and introducing the refrigerant into the refrigerant passage, a refrigerant outlet path connected to the case and leading the refrigerant from the refrigerant path, and a predetermined gap inside the case. A plurality of the exhaust gas passages and the plurality of refrigerant passages are alternately formed, an exhaust gas introduction port is formed at a position facing the exhaust gas introduction tube, and the exhaust gas outlet tube is formed. A partition wall member that forms an exhaust gas outlet at a position opposite to the refrigerant inlet, forms a refrigerant inlet at a position opposite to the refrigerant inlet, and forms a refrigerant outlet at a position opposite to the refrigerant outlet. Prepare.

  The exhaust gas introduction pipe is connected to one end side of the case and the exhaust gas outlet pipe is connected to the other end side of the case with the exhaust gas passage extending in one direction interposed therebetween, and the refrigerant introduction path Is provided on the side crossing the one direction and near the exhaust gas introduction pipe of the case, and the refrigerant outlet path is the same as the connection position side of the refrigerant introduction path. On the side of the exhaust gas outlet pipe of the case.

  The exhaust gas introduction pipe is connected to the case so that the central axis of the exhaust gas introduction pipe is inclined away from the refrigerant introduction port as it goes to the exhaust gas introduction port.

  Each of the refrigerant passages is provided with a continuous linear refrigerant guide member that closes a part of the refrigerant passage, and one end of the refrigerant guide member is located near the refrigerant inlet from the refrigerant inlet. Is located on the exhaust gas outlet side, and the other end of the refrigerant guide member is located on the exhaust gas inlet side of the refrigerant inlet and is located in a region overlapping the projection of the opening of the exhaust gas inlet pipe To do.

  In another form, in the refrigerant passage, the first minimum opening area of the refrigerant passage when viewed from the refrigerant introduction port side is any of the minimum opening area of the refrigerant introduction passage and the total opening area of the refrigerant introduction port. It is larger than the smaller area.

  In another form, in the refrigerant passage, the second minimum opening area of the refrigerant passage as viewed from the exhaust gas inlet side is the minimum opening area of the refrigerant introduction passage and the total opening area of the refrigerant inlet. It is larger than the smaller one.

  In another embodiment, the partition wall member has a linear continuous convex region that bulges from the exhaust gas passage side toward the refrigerant passage side, and the convex region of the adjacent partition wall member. The refrigerant guide members are formed by contacting each other.

  In an exhaust gas heat exchanger according to another aspect based on the present invention, the exhaust gas heat exchanger is partitioned into an exhaust gas passage and a refrigerant passage, the exhaust gas is introduced into the exhaust gas passage, the refrigerant is introduced into the refrigerant passage, and An exhaust gas heat exchanger that cools the exhaust gas by exchanging heat between the exhaust gas and the refrigerant, and includes the following configuration.

  A case in which the exhaust gas passage and the refrigerant passage are formed; an exhaust gas inlet pipe connected to the case for introducing the exhaust gas into the exhaust gas passage; and a case connected to the case; An exhaust gas outlet pipe led out from the exhaust gas passage.

  A refrigerant introduction path connected to the case and introducing the refrigerant into the refrigerant passage, a refrigerant outlet path connected to the case and leading the refrigerant from the refrigerant path, and a predetermined gap inside the case. A plurality of the exhaust gas passages and the plurality of refrigerant passages are alternately formed, an exhaust gas introduction port is formed at a position facing the exhaust gas introduction tube, and the exhaust gas outlet tube is formed. A partition wall member that forms an exhaust gas outlet at a position opposite to the refrigerant inlet, forms a refrigerant inlet at a position opposite to the refrigerant inlet, and forms a refrigerant outlet at a position opposite to the refrigerant outlet. Prepare.

  The exhaust gas introduction pipe is connected to one end side of the case and the exhaust gas outlet pipe is connected to the other end side of the case with the exhaust gas passage extending in one direction interposed therebetween, and the refrigerant introduction path Is provided on the side of the direction crossing the one direction and close to the exhaust gas outlet pipe of the case, and the refrigerant outlet path is the same as the connecting position side of the refrigerant inlet path. On the side of the exhaust gas introduction pipe of the case.

  The exhaust gas introduction pipe is connected to the case so that the central axis of the exhaust gas introduction pipe is inclined away from the refrigerant outlet as it goes to the exhaust gas introduction.

  Each of the refrigerant passages is provided with a continuous linear refrigerant guide member that closes a part of the refrigerant passage, and one end of the refrigerant guide member is located near the refrigerant outlet port from the refrigerant outlet port. Is located on the exhaust gas outlet side, and the other end of the refrigerant guide member is located on the exhaust gas inlet side of the refrigerant outlet and in a region overlapping the projection of the opening of the exhaust gas inlet pipe. To do.

  According to the exhaust gas heat exchanger according to the present invention, the central axis direction of the exhaust gas introduction pipe provided in the exhaust gas heat exchanger is inclined with respect to the extending direction of the exhaust gas passage in the exhaust gas heat exchanger. Even if it is a case, an exhaust gas heat exchanger provided with the structure which can improve the heat exchange efficiency of the exhaust gas by a refrigerant | coolant is provided.

It is a schematic diagram of the EGR gas cooling device using the exhaust gas heat exchanger in embodiment. It is a partial section perspective view showing the structure of the exhaust gas heat exchanger in an embodiment. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. FIG. 6 is a sectional view taken along line VI-VI in FIG. 3. It is a VII-VII line arrow directional cross-sectional view in FIG. FIG. 7 is a cross-sectional view taken along line VIII-VIII in FIG. 6. FIG. 3 is a schematic diagram showing “main flow of exhaust gas” and “main flow of refrigerant” of the exhaust gas heat exchanger in the embodiment. FIG. 4 is a cross-sectional view taken along line XX in FIG. 3. It is a figure which shows the contact state in the edge part of the refrigerant | coolant guide member of the exhaust gas heat exchanger in embodiment. FIG. 4 is a cross-sectional view taken along line XII-XII in FIG. 3. FIG. 4 is a cross-sectional view taken along line XIII-XIII in FIG. 3. It is a figure equivalent to the VIII-VIII line arrow directional cross-sectional view in FIG. It is a figure equivalent to the XV-XV arrow directional cross-sectional view in FIG. It is a figure equivalent to the III-III arrow line cross section in FIG. 2 which shows the structure of the exhaust gas heat exchanger in other embodiment. It is sectional drawing which shows "the main flow of exhaust gas" and the "main flow of a refrigerant | coolant" of the exhaust gas heat exchanger in other embodiment. It is sectional drawing which shows the structure of the exhaust gas heat exchanger in other embodiment.

  The structure of the exhaust gas heat exchanger in the embodiment based on the present invention will be described below with reference to the drawings. Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In addition, it is planned from the beginning to use a combination of the configurations appearing in each embodiment as appropriate.

(EGR gas cooling device)
With reference to FIG. 1, an EGR (Exhaust Gas Recirculation) gas cooling apparatus using an exhaust gas heat exchanger in the present embodiment will be described. FIG. 1 shows an exhaust gas heat exchanger 100 according to this embodiment applied to an EGR gas cooling device for a diesel engine (internal combustion engine) 200.

  The diesel engine 200 (hereinafter abbreviated as “engine”) is provided with an exhaust gas recirculation pipe 210 that allows a part of the exhaust gas discharged from the engine 200 to flow to the intake side of the engine.

  An EGR valve 220 that adjusts the amount of EGR gas according to the operating state of the engine 200 is provided in the middle region of the exhaust gas recirculation pipe 210. An exhaust gas heat exchanger 100 is disposed in the exhaust gas recirculation pipe 210 between the EGR valve 220 and the engine 200. In the exhaust gas heat exchanger 100, the exhaust gas is cooled by introducing the exhaust gas into the exhaust gas passage, introducing the refrigerant into the refrigerant passage, and exchanging heat between the exhaust gas and the refrigerant.

(Exhaust gas heat exchanger 100)
The configuration of the exhaust gas heat exchanger 100 will be described with reference to FIGS. 2 is a partial cross-sectional perspective view showing the structure of the exhaust gas heat exchanger 100 in the present embodiment, FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2, and FIG. 4 is IV in FIG. 5 is a cross-sectional view taken along line VV in FIG. 3, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 3, and FIG. VII-VII line arrow sectional drawing, FIG. 8 is the VIII-VIII line arrow sectional drawing in FIG.

  2 and 3, exhaust gas heat exchanger 100 includes a case 110 in which exhaust gas passage ER and refrigerant passage CR are partitioned. The case 110 is long along the X direction in which the exhaust gas passage ER extends, and has a box shape with a square cross section.

  An exhaust gas introduction pipe 121 for introducing the exhaust gas EG into the exhaust gas passage ER is provided on one end side of the case 110. The exhaust gas introduction pipe 121 is provided with a flange 120 used when connecting to an external pipe. The exhaust gas introduction pipe 121 is provided with a circular pipe member, and an introduction skirt 122 is provided between the case 110 and the exhaust gas introduction pipe 121 to prevent leakage of the exhaust gas EG to the outside. Yes.

  In the case 110, in the X direction (one direction) in which the exhaust gas passage ER extends with respect to the exhaust gas introduction pipe 121, the exhaust gas passage ER is sandwiched between the exhaust gas passage ER and the exhaust gas passage ER. An exhaust gas outlet pipe 131 is provided for leading the introduced exhaust gas EG from the exhaust gas passage ER.

  The exhaust gas outlet pipe 131 is provided with a flange 130 used when connecting to an external pipe. The exhaust gas lead-out pipe 131 is provided with a circular pipe member, and a lead-out skirt 132 is provided between the case 110 and the exhaust gas lead-out pipe 131 to prevent leakage of the exhaust gas EG to the outside. Yes.

  The case 110 is provided with a refrigerant introduction path 150 for introducing the refrigerant CM into the refrigerant path CR and a refrigerant outlet path 170 for deriving the refrigerant CM from the refrigerant path CR. The refrigerant introduction path 150 and the refrigerant outlet path 170 are provided on the same side of the case 110 on the side in the Y direction that intersects the X direction (one direction) in which the exhaust gas passage ER extends. The passage 150 is provided at a position near the exhaust gas introduction pipe 121, and the refrigerant outlet path 170 is provided at a position near the exhaust gas outlet pipe 131.

  The refrigerant introduction path 150 includes a refrigerant introduction pipe 151 and a box-shaped refrigerant introduction cover 152. The refrigerant outlet path 170 includes a refrigerant outlet pipe 171 and a box-shaped refrigerant outlet cover 172.

  A refrigerant introduction port CR1 is opened at a position facing the refrigerant introduction pipe 151 on the outer surface of the case 110 covered with the refrigerant introduction cover 152 (see FIG. 8). A refrigerant outlet CR <b> 2 is opened at a position where the refrigerant outlet pipe 171 on the outer surface of the case 110 covered with the refrigerant outlet cover 172 faces.

  Referring to FIG. 4, a plurality of exhaust gas passages ER and a plurality of refrigerant passages CR are alternately divided and disposed in the case 110 with a predetermined gap therebetween, and an exhaust gas introduction pipe is provided. In the present embodiment, ten partition wall members 180 are provided in which the exhaust gas introduction port ER1 is formed at a position facing the 121 and the exhaust gas lead-out port ER2 is formed at a position facing the exhaust gas discharge pipe 131. Yes.

  With reference to FIGS. 5 to 7, in the present embodiment, a flat tube member 180 </ b> A is used as the partition wall member 180. The tube member 180A is formed by press-molding a single plate material into a tube shape, and both ends are fixed by brazing. This brazing part is located on the refrigerant introduction cover 152 and the refrigerant outlet cover 172 side. Note that the brazing position of the tube member 180A is not limited to the position of the present embodiment.

  Both end portions on the X direction side of the tube member 180A are formed so as to expand outward, and one end side constitutes an exhaust gas inlet ER1, and the other end side constitutes an exhaust gas outlet ER2. The tube member 180A expanded outward is brazed to the expanded portion of the adjacent tube member 180A.

  In the present embodiment, five flat tube members 180A are arranged with a predetermined gap therebetween. 5 to 7, the lower end of the tube member 180A in the drawing and the upper end in the drawing are connected to each other without causing a gap on the inner surface of the case 110. Thereby, the internal space (5 places) of tube member 180A constitutes exhaust gas passage ER, respectively, and the space (6 places) sandwiched between adjacent tube members 180A constitutes refrigerant passage CR.

  Referring to FIG. 8, a refrigerant introduction port CR <b> 1 is opened at a position where the refrigerant introduction pipe 151 of the case 110 covered with the refrigerant introduction cover 152 faces. Six refrigerant passages CR partitioned by the tube member 180A are exposed from the refrigerant inlet CR1.

  Although not shown in detail, similarly to FIG. 8, the refrigerant outlet CR2 is opened at a position where the refrigerant outlet pipe 171 of the case 110 covered with the refrigerant outlet cover 172 faces. Six refrigerant passages CR partitioned by the tube member 180A are exposed from the refrigerant outlet CR2.

  Referring to FIG. 3 again, in the present embodiment, the exhaust gas inlet pipe 121 is exhausted so that the central axis CL1 inclines in a direction away from the refrigerant inlet CR1 toward the exhaust gas inlet ER1. A gas introduction pipe 121 is connected to the case 110.

(Refrigerant guide member 190)
In each of the refrigerant passages CR, a continuous linear refrigerant guide member 190 is disposed so as to block a part of the refrigerant passage CR. The refrigerant guide member 190 has one end T1 positioned nearer to the exhaust gas outlet ER2 than the opening L1 on the exhaust gas outlet ER2 side of the refrigerant inlet CR1 in the vicinity of the refrigerant inlet CR1. The other end T2 of 190 is located closer to the exhaust gas introduction port ER1 than the opening end L2 on the exhaust gas introduction port ER1 side. Furthermore, the other end T <b> 2 of the refrigerant guide member 190 is located in a region overlapping the opening projection P <b> 1 of the exhaust gas introduction pipe 121.

  The opening projection P1 of the exhaust gas introduction pipe 121 is a case where the inner region of the exhaust gas introduction pipe 121 is projected toward the refrigerant guide member 190 along the central axis CL1 with the central axis CL1 of the exhaust gas introduction pipe 121 as the center. That projection plane.

  As clearly shown in FIGS. 4 and 6, the refrigerant guide member 190 is formed by the convex regions 180 g provided on the adjacent partition wall members 180 being in contact with each other. The convex region 180g is a linear continuous region that bulges from the exhaust gas passage ER side toward the refrigerant passage CR side.

  Further, as shown in FIG. 4, the refrigerant guide members 190 located on the most side surfaces facing the inner surface of the case 110 are provided with a convex region 110 g provided on the case 110 and a convex provided on the partition wall member 180. The refrigerant guide member 190 is formed by the partial areas 180g contacting each other.

  In addition, the structure of the refrigerant | coolant guide member 190 is not limited by formation of a convex part area | region. A member different from the partition wall member 180 (for example, a rod-shaped member having a rectangular cross section) may be attached.

("Main flow of exhaust gas" and "Main flow of refrigerant")
Next, with reference to FIG. 9, the “main flow of refrigerant in the exhaust gas heat exchanger 100 having the above configuration” and “the main flow of exhaust gas” will be described. FIG. 9 is a schematic diagram showing “main flow of refrigerant” and “main flow of exhaust gas” of exhaust gas heat exchanger 100 in the present embodiment.

  FIG. 9 shows a cross section in which the refrigerant passage CR is exposed. Note that liquid and gas can be used as the refrigerant, but in this embodiment, a case where cooling water is used as the refrigerant will be described.

  First, “main flow of refrigerant” will be described. As described above, in the vicinity of the refrigerant inlet CR1, one end T1 of the refrigerant guide member 190 is closer to the exhaust gas guide than the opening end L1 on the exhaust gas outlet ER2 side of the refrigerant inlet CR1 in the vicinity of the refrigerant inlet CR1. Located on the outlet ER2 side, the other end T2 of the refrigerant guide member 190 is located on the exhaust gas inlet ER1 side with respect to the opening end L2 on the exhaust gas inlet ER1 side. Furthermore, the other end T <b> 2 of the refrigerant guide member 190 is located in a region overlapping the opening projection P <b> 1 of the exhaust gas introduction pipe 121.

  Thereby, the cooling water CM introduced from the refrigerant introduction path 150 through the refrigerant introduction port CR1 into the refrigerant path CR flows along the refrigerant guide member 190 toward the exhaust gas introduction pipe 121. At this time, the opening area of the flow path through which the cooling water CM defined by using the refrigerant guide member 190 gradually decreases toward the exhaust gas introduction pipe 121 side. As a result, the flow rate of the cooling water CM gradually increases.

  Further, when the refrigerant guide member 190 is inclined toward the exhaust gas inlet ER1 side, the refrigerant guide is provided even when the refrigerant inlet CR1 is provided at the exhaust gas outlet ER2 side. Since the opening area of the flow path through which the cooling water CM defined using the member 190 flows can be gradually reduced toward the exhaust gas introduction pipe 121 side, the flow velocity at which the cooling water CM flows is gradually increased. be able to.

  Thereafter, the cooling water CM that has reached the other end T2 of the refrigerant guide member 190 forms a flow around the other end T2 toward the refrigerant outlet CR2. This flow of the cooling water CM becomes the “main flow of the refrigerant”.

  Next, “main flow of exhaust gas” will be described. As described above, the exhaust gas introduction pipe 121 is connected to the case 110 such that the central axis CL1 is inclined in a direction away from the refrigerant introduction port CR1 toward the exhaust gas introduction port ER1.

  As a result, the exhaust gas EG introduced into the exhaust gas passage ER from the exhaust gas introduction pipe 121 through the exhaust gas introduction port ER1 flows toward the other end T2 side of the refrigerant guide member 190. Thereafter, the exhaust gas EG contacts the exhaust gas passage ER and forms a flow toward the exhaust gas outlet ER2. The flow of the exhaust gas EG becomes “the main flow of the exhaust gas”.

  As described above, according to the exhaust gas heat exchanger 100 of the present embodiment, the refrigerant passage CR and the exhaust gas passage ER disposed on both sides of the partition wall member 180 are separated from each other in the refrigerant passage CR. The “main flow” and the “main flow of exhaust gas” in the exhaust gas passage ER can be made to coincide with each other around the other end T2 of the refrigerant guide member 190.

  Around the other end T2 of the coolant guide member 190, the coolant water CM flows in the fastest region. Further, the hot exhaust gas EG is also concentrated in this region. As a result, it is possible to efficiently exchange heat between the cooling water CM and the exhaust gas EG around the other end T2 of the refrigerant guide member 190.

  Here, when the position of the other end T <b> 2 of the refrigerant guide member 190 does not overlap with the opening projection P <b> 1 of the exhaust gas introduction pipe 121, it cannot be expected that the flow of the cooling water CM is accelerated. As a result, it is considered that efficient heat exchange cannot be expected.

  On the other hand, the position of the other end T2 of the refrigerant guide member 190 overlaps the projection P1 of the opening of the exhaust gas introduction pipe 121, and the other end T2 of the refrigerant guide member 190 is extended to a position exceeding the central axis CL1. Although the opening area of the flow path through which the CM flows can be reduced and the flow speed of the cooling water CM can be increased, there is a concern that the pressure loss of the cooling water CM will be increased and the flow rate will be lowered. Therefore, the position of the other end T <b> 2 of the refrigerant guide member 190 may be provided at an optimal position that overlaps with the opening projection P <b> 1 of the exhaust gas introduction pipe 121 in consideration of heat exchange efficiency.

  With reference to FIGS. 10 to 15, the opening area of the refrigerant passage CR through which the cooling water CM flows is examined. FIG. 10 is a cross-sectional view taken along line XX in FIG. 3, FIG. 11 is a diagram showing a contact state at the end of the refrigerant guide member of the exhaust gas heat exchanger in the present embodiment, and FIG. 3 is a cross-sectional view taken along line XII-XII in FIG. 3, FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 3, FIG. 14 is a cross-sectional view taken along line VIII-VIII in FIG. FIG. 5 is a view corresponding to a cross-sectional view taken along line XV-XV in FIG. 3.

  As shown in FIG. 10, in the refrigerant passage CR, the first minimum opening area S10 of the refrigerant passage CR when viewed from the refrigerant introduction port CR1 side is a region of the other end T2 of the refrigerant guide member 190. In FIG. 10 and FIG. 11, the point A means the contact of the convex part area | region 180g which contact | abuts. At the other end T2 of the refrigerant guide member 190, the end of the convex region 180g has a spherical shape with a radius r.

  It is preferable that the first minimum opening area S10 is larger than the smaller one of the minimum opening area of the refrigerant introduction path 150 and the total opening area of the refrigerant introduction port CR1.

  The minimum opening area of the refrigerant introduction path 150 is one of the opening area S20 of the refrigerant introduction pipe 151 shown in FIG. 12 and the opening area S30 surrounded by the case 110 and the refrigerant introduction cover 152 shown in FIG. Means the opening area.

  Further, as shown in FIG. 14, the total opening area of the refrigerant inlet CR1 means the sum of the opening areas S40 of the refrigerant passage CR exposed at the refrigerant inlet CR1, and in the case of the present embodiment, S40 × 6

  As described above, the first minimum opening area S10 is provided larger than the smaller one of the minimum opening area of the refrigerant introduction path 150 and the total opening area of the refrigerant introduction port CR1, so that in the refrigerant passage CR. While controlling the generation of the pressure loss, the heat exchange between the cooling water CM and the exhaust gas EG can be efficiently performed around the other end T2 of the refrigerant guide member 190.

  Further, as shown in FIG. 15, in the refrigerant passage CR, the second minimum opening area S50 of the refrigerant passage CR when viewed from the exhaust gas introduction port ER1 side occurs in the region of the other end T2 of the refrigerant guide member 190. In FIG. 15, point A is the same as above.

  The second minimum opening area S50 is preferably larger than the smaller one of the minimum opening area of the refrigerant introduction path 150 and the total opening area of the refrigerant introduction port CR1.

  The minimum opening area of the refrigerant introduction path 150 and the total opening area of the refrigerant introduction port CR1 are the same as described above.

  As described above, the second minimum opening area S50 is provided larger than the smaller one of the minimum opening area of the refrigerant introduction path 150 and the total opening area of the refrigerant introduction port CR1, so that in the refrigerant passage CR. While controlling the generation of the pressure loss, the heat exchange between the cooling water CM and the exhaust gas EG can be efficiently performed around the other end T2 of the refrigerant guide member 190.

  In addition, although the refrigerant | coolant guide member 190 shown in the said embodiment has a linear form, it is not limited to this form. It is also possible to employ a refrigerant guide member 190A having an inclined portion 190a and a straight portion 190b as shown in FIG.

  The refrigerant guide member 190A also has an end T1 of the inclined portion 190a in the vicinity of the refrigerant inlet CR1, and an exhaust gas that is closer to the exhaust gas outlet ER2 side of the refrigerant inlet CR1 than the opening L1 in the vicinity of the refrigerant inlet CR1. The other end T2 of the straight line portion 190b is positioned on the exhaust gas inlet ER1 side with respect to the opening end L2 on the exhaust gas inlet ER1 side. Furthermore, the other end T <b> 2 of the straight portion 190 b is located in a region overlapping the opening projection P <b> 1 of the exhaust gas introduction pipe 121.

  As described above, according to the exhaust gas heat exchanger 100 in the present embodiment, the high-temperature exhaust gas can be obtained by guiding the cooling water CM to the vicinity of the central axis CL1 of the exhaust gas introduction pipe 121 using the refrigerant guide members 190 and 190A. The exhaust gas EG can be efficiently cooled by aiming at the main flow of the gas EG.

  Further, as a result of the efficient cooling of the exhaust gas EG, the exhaust gas heat exchanger 100 can be downsized. Further, the occurrence of a temperature difference between the case 110 and the tube member 180A is reduced, and the generation of thermal stress on the tube member 180A due to the difference in thermal expansion can be suppressed.

  Even when the central axis CL1 of the exhaust gas introduction pipe 121 is inclined in a direction away from the refrigerant introduction port CR1 toward the exhaust gas introduction port ER1, the exhaust gas EG can be efficiently cooled. Therefore, the degree of freedom in designing the exhaust gas heat exchanger 100 and the mounting performance on the vehicle can be greatly increased.

(Other embodiments)
(Exhaust gas heat exchanger 100A)
In the exhaust gas heat exchanger 100 in the above embodiment, as described with reference to FIG. 9, “main refrigerant flow” and “main exhaust gas flow” are in the same direction (in FIG. 9). The case of flowing in the direction from the right side to the left side) has been described, but the present invention is not limited to this configuration.

  As another form of the exhaust gas heat exchanger 100, the configuration of the exhaust gas heat exchanger 100A shown in FIG. 17 can be adopted. Compared with the exhaust gas heat exchanger 100, the exhaust gas heat exchanger 100A has the “main refrigerant flow” and the “main exhaust gas flow” in opposite directions (in FIG. The “na flow” has a configuration in which the flow direction is from the left side to the right side, “the main flow of exhaust gas”, and the flow direction from the right side to the left side).

  Specifically, in the exhaust gas heat exchanger 100A, the case 110 is provided with a refrigerant introduction path 150 for introducing the refrigerant CM into the refrigerant path CR and a refrigerant outlet path 170 for deriving the refrigerant CM from the refrigerant path CR. ing. The refrigerant introduction path 150 and the refrigerant outlet path 170 are provided on the same side of the case 110 on the side in the Y direction that intersects the X direction (one direction) in which the exhaust gas passage ER extends. The passage 150 is provided at a position near the exhaust gas outlet pipe 131, and the refrigerant outlet path 170 is provided at a position near the exhaust gas introduction pipe 121. The exhaust gas heat exchanger 100 is attached in the reverse direction.

  The refrigerant introduction path 150 includes a refrigerant introduction pipe 151 and a box-shaped refrigerant introduction cover 152. The refrigerant outlet path 170 includes a refrigerant outlet pipe 171 and a box-shaped refrigerant outlet cover 172.

  A refrigerant introduction port CR1 is opened at a position facing the refrigerant introduction pipe 151 on the outer surface of the case 110 covered with the refrigerant introduction cover 152 (see FIG. 17). A refrigerant outlet CR <b> 2 is opened at a position where the refrigerant outlet pipe 171 on the outer surface of the case 110 covered with the refrigerant outlet cover 172 faces.

  One end T1 of the refrigerant guide member 190 is positioned in the vicinity of the refrigerant outlet port CR2 closer to the exhaust gas outlet ER2 than the opening end L1 of the refrigerant outlet CR2 on the exhaust gas outlet ER2 side. The other end T2 is located on the exhaust gas inlet ER1 side with respect to the opening end L2 on the exhaust gas inlet ER1 side. Furthermore, the other end T <b> 2 of the refrigerant guide member 190 is located in a region overlapping the opening projection P <b> 1 of the exhaust gas introduction pipe 121.

  The opening projection P1 of the exhaust gas introduction pipe 121 is a case where the inner region of the exhaust gas introduction pipe 121 is projected toward the refrigerant guide member 190 along the central axis CL1 with the central axis CL1 of the exhaust gas introduction pipe 121 as the center. That projection plane. Other specific configurations of the exhaust gas heat exchanger 100A are the same as those of the exhaust gas heat exchanger 100.

  Also in the exhaust gas heat exchanger 100A having this configuration, the same effects as those of the exhaust gas heat exchanger 100 can be obtained.

(Exhaust gas heat exchanger 100B)
Further, as another form of the exhaust gas heat exchanger 100, a configuration of an exhaust gas heat exchanger 100B shown in FIG. 18 can be adopted. As compared with the exhaust gas heat exchanger 100, the exhaust gas heat exchanger 100B is also provided with a refrigerant guide member 190 on the refrigerant outlet path 170 side.

  Specifically, the refrigerant guide member 190 provided on the refrigerant outlet path 170 side is disposed so as to be substantially bilaterally symmetrical in the drawing with respect to the refrigerant guide member 190 provided in the refrigerant introduction path 150.

  The refrigerant guide member 190 provided on the refrigerant outlet path 170 side has one end T11 in the vicinity of the refrigerant outlet port CR2, and the exhaust gas inlet ER1 side of the refrigerant outlet port CR2 closer to the exhaust gas inlet ER1 than the opening end L11. The other end T12 of the refrigerant guide member 190 is located closer to the exhaust gas outlet ER2 than the opening end L12 on the exhaust gas outlet ER2 side. Furthermore, the other end T <b> 12 of the refrigerant guide member 190 is located in a region overlapping the opening projection P <b> 11 of the exhaust gas outlet pipe 131.

  The opening projection P12 of the exhaust gas outlet pipe 131 is a case where the inner region of the exhaust gas outlet pipe 131 is projected toward the refrigerant guide member 190 along the central axis CL11 with the central axis CL11 of the exhaust gas outlet pipe 131 as the center. That projection plane. Other specific configurations of the exhaust gas heat exchanger 100B are the same as those of the exhaust gas heat exchanger 100.

  Also in the exhaust gas heat exchanger 100B having this configuration, the same operational effects as those of the exhaust gas heat exchanger 100 can be obtained.

  Furthermore, by providing the refrigerant guide member 190 on both the refrigerant introduction path 150 side and the refrigerant outlet path 170 side, it is possible to maintain the right and left rigidity balance of the exhaust gas heat exchanger 100B. Moreover, it becomes possible to make the partition wall member 180 symmetrical, so that it becomes easy to press-mold the partition wall member 180.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100, 100A, 100B Exhaust gas heat exchanger, 110 case, 110g, 180g convex region, 120, 130 flange, 121 exhaust gas introduction pipe, 122 introduction side skirt, 131 exhaust gas outlet pipe, 132 outlet side skirt, 150 refrigerant Inlet passage, 151 Refrigerant introduction pipe, 152 Refrigerant introduction cover, 170 Refrigerant outlet passage, 171 Refrigerant outlet pipe, 172 Refrigerant outlet cover, 180 Partition wall member, 180A tube member, 190, 190A Refrigerant guide member, 190a Inclined portion, 190b Straight line Part, 200 diesel engine (engine), 210 recirculation pipe, 220 valve, CL1 central shaft, CR refrigerant passage, CR1 refrigerant inlet, CR2 refrigerant outlet, EG exhaust gas, ER exhaust gas passage, ER1 exhaust gas inlet, ER2 Exhaust gas outlet, P Opening projection, S10 first minimum opening area, S20, S30, S40 open area, S50 second minimum opening area, T1 end, T2 other end.

Claims (5)

The exhaust gas passage is divided into a refrigerant passage, the exhaust gas is introduced into the exhaust gas passage, the refrigerant is introduced into the refrigerant passage, and heat exchange is performed between the exhaust gas and the refrigerant. An exhaust gas heat exchanger for cooling the gas,
A case in which the exhaust gas passage and the refrigerant passage are formed;
An exhaust gas introduction pipe connected to the case and introducing the exhaust gas into the exhaust gas passage;
An exhaust gas outlet pipe connected to the case and leading out the exhaust gas from the exhaust gas passage;
A refrigerant introduction path connected to the case and introducing the refrigerant into the refrigerant passage;
A refrigerant lead-out path connected to the case and leading out the refrigerant from the refrigerant passage;
A plurality of exhaust gas passages and a plurality of refrigerant passages are alternately formed inside the case with a predetermined gap therebetween, and exhaust gas introduction is performed at positions where the exhaust gas introduction pipes face each other. Forming an outlet, forming an exhaust gas outlet at a position where the exhaust gas outlet pipe is opposed, forming a refrigerant inlet at a position where the refrigerant inlet path is opposite, and introducing a refrigerant to a position where the refrigerant outlet path is opposite. A partition wall member forming an outlet;
With
The exhaust gas introduction pipe is connected to one end side of the case with the exhaust gas passage extending in one direction, and the exhaust gas outlet pipe is connected to the other end side of the case,
The refrigerant introduction path is provided on a side in a direction intersecting the one direction and at a position near the exhaust gas introduction pipe of the case,
The refrigerant lead-out path is provided on the same side as the connection position side of the refrigerant introduction path, at a position near the exhaust gas lead-out pipe of the case,
The exhaust gas introduction pipe is connected to the case so that a central axis of the exhaust gas introduction pipe is inclined in a direction away from the refrigerant introduction port as it goes to the exhaust gas introduction port,
In each of the refrigerant passages, a part of the refrigerant passage is closed, and a continuous linear refrigerant guide member is disposed,
One end of the refrigerant guide member is located closer to the exhaust gas outlet than the refrigerant inlet in the vicinity of the refrigerant inlet,
The other end of the refrigerant guide member is located closer to the exhaust gas introduction port than the refrigerant introduction port, and is located in a region overlapping the projection of the opening of the exhaust gas introduction pipe.   In the refrigerant passage, the first minimum opening area of the refrigerant passage as viewed from the refrigerant introduction port side is the smaller one of the minimum opening area of the refrigerant introduction passage and the total opening area of the refrigerant introduction port. The exhaust gas heat exchanger according to claim 1, wherein the exhaust gas heat exchanger is provided larger than the exhaust gas heat exchanger.   In the refrigerant passage, the second minimum opening area of the refrigerant passage when viewed from the exhaust gas introduction port side is the smaller of the minimum opening area of the refrigerant introduction passage and the total opening area of the refrigerant introduction port. The exhaust gas heat exchanger according to claim 1 or 2, wherein the exhaust gas heat exchanger is provided larger than an area. The partition wall member has a linear continuous convex region that bulges from the exhaust gas passage side toward the refrigerant passage side,
The exhaust gas heat exchanger according to any one of claims 1 to 3, wherein the refrigerant guide member is formed by bringing the convex regions of the adjacent partition wall members into contact with each other. The exhaust gas passage is divided into a refrigerant passage, the exhaust gas is introduced into the exhaust gas passage, the refrigerant is introduced into the refrigerant passage, and heat exchange is performed between the exhaust gas and the refrigerant. An exhaust gas heat exchanger for cooling the gas,
A case in which the exhaust gas passage and the refrigerant passage are formed;
An exhaust gas introduction pipe connected to the case and introducing the exhaust gas into the exhaust gas passage;
An exhaust gas outlet pipe connected to the case and leading out the exhaust gas from the exhaust gas passage;
A refrigerant introduction path connected to the case and introducing the refrigerant into the refrigerant passage;
A refrigerant lead-out path connected to the case and leading out the refrigerant from the refrigerant passage;
A plurality of exhaust gas passages and a plurality of refrigerant passages are alternately formed inside the case with a predetermined gap therebetween, and exhaust gas introduction is performed at positions where the exhaust gas introduction pipes face each other. Forming an outlet, forming an exhaust gas outlet at a position where the exhaust gas outlet pipe is opposed, forming a refrigerant inlet at a position where the refrigerant inlet path is opposite, and introducing a refrigerant to a position where the refrigerant outlet path is opposite. A partition wall member forming an outlet;
With
The exhaust gas introduction pipe is connected to one end side of the case with the exhaust gas passage extending in one direction, and the exhaust gas outlet pipe is connected to the other end side of the case,
The refrigerant introduction path is provided on a side in a direction intersecting with the one direction and at a position near the exhaust gas outlet pipe of the case.
The refrigerant lead-out path is provided on the same side as the connection position side of the refrigerant introduction path, and is provided at a position near the exhaust gas introduction pipe of the case,
The exhaust gas introduction pipe is connected to the case so that a central axis of the exhaust gas introduction pipe is inclined in a direction away from the refrigerant outlet as it goes to the exhaust gas introduction;
In each of the refrigerant passages, a part of the refrigerant passage is closed, and a continuous linear refrigerant guide member is disposed,
One end of the refrigerant guide member is positioned closer to the exhaust gas outlet than the refrigerant outlet in the vicinity of the refrigerant outlet.
The other end of the refrigerant guide member is located closer to the exhaust gas introduction port than the refrigerant outlet, and is located in a region overlapping the projection of the opening of the exhaust gas introduction pipe.

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