JP2017008913A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently suppress unevenness of the flow rate of medium flowing into a core, in a heat exchanger.SOLUTION: A tank 30 of an EGR cooler 1 (heat exchanger) has: guide surfaces 32A, 32B guiding coolant (medium) flowing from an inlet 31 toward outlet 39; a first side surface 32C and a second side surface 32D opposite to each with the guide surfaces 32A, 32B held therebetween; and a guide rib 33 projecting from the guide surface 32A and the first side surface 32C and making cooling flow toward the outlet 39. The guide rib 33 has a tip 33A forming a first intermediate flow passage 44, in which coolant flows, between itself and a core 20 so as to face the outlet 39, and a side end 33B forming a second intermediate flow passage 45, in which coolant flows, between itself and the second side surface 32D.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat exchanger in which heat exchange is performed between a circulating medium and a passing fluid.

  Patent Document 1 discloses an EGR cooler including a shell in which cooling water circulates and a core formed of a plurality of tubes that are arranged inside the shell and through which EGR gas passes.

  The EGR cooler includes a hollow adapter member that guides circulating cooling water to the shell. The shell has a plurality of inflow holes that guide the cooling water to the core. The adapter member is provided so as to cover each inflow hole portion of the shell, and an introduction port through which cooling water is introduced opens at one end thereof. The inflow hole portion and the introduction port are arranged so as to be orthogonal to each other.

  During operation of the engine, circulating cooling water flows into the adapter member from the inlet. The cooling water that has flowed into the adapter member from the introduction port is directed to each inflow hole by the adapter member, and flows into the core in the shell from each inflow hole. In the core, the cooling water circulates around the tube, and the EGR gas is cooled by passing the EGR gas through the inside of the tube.

JP 2009-114924 A

  However, in such a conventional EGR cooler, since the flow of the cooling water is bent by the adapter member, there is an operation state in which the cooling water is concentrated from some inflow holes and flows into the core. There is a problem that the deviation of the flow rate of the cooling water flowing in cannot be sufficiently suppressed.

  The present invention has been made in view of the above problems, and an object of the present invention is to sufficiently suppress a deviation in the flow rate of a medium flowing into a core in a heat exchanger.

  According to an aspect of the present invention, there is provided a heat exchanger that includes a core in which heat exchange is performed between a circulating medium and a fluid that passes therethrough, and a tank that guides the medium to the core. An inlet for flowing in, an outlet for discharging the medium to the core, a guide surface for guiding the medium from the inlet to the outlet, a first side surface and a second side surface facing each other across the guide surface, a guide surface and a first surface A guide rib protruding from the side surface and directing the flow direction of the medium toward the outlet, the guide rib opposing the outlet and forming a first intermediate flow path through which the medium flows between the core and the second side surface And a side end forming a second intermediate flow path through which the medium flows.

  According to the above aspect, in the tank, the medium is guided by the guide ribs and flows toward the core, the medium flows through the first intermediate flow path toward the core, and the medium passes through the second intermediate flow path. The flow is directed to the core by being guided by the street guide surface. Thereby, the deviation of the flow rate of the medium flowing into the core can be sufficiently suppressed.

It is a perspective view which shows the EGR cooler which concerns on embodiment of this invention. It is sectional drawing of the tank which follows the II-II line of FIG. It is sectional drawing of the tank which follows the III-III line of FIG. It is a perspective view which shows the cross section of the tank which follows the IV-IV line of FIG. It is sectional drawing which shows the modification of a tank. It is sectional drawing of the tank which follows the VI-VI line of FIG. It is a perspective view which shows the cross section of the tank which follows the VII-VII line of FIG. It is sectional drawing which shows the other modification of a tank. It is sectional drawing of the tank which follows the IX-IX line of FIG. It is a perspective view which shows the cross section of the tank which follows the XX line of FIG. It is sectional drawing which shows the other modification of a tank. It is sectional drawing of the tank which follows the XII-XII line | wire of FIG. It is a perspective view which shows the cross section of the tank which follows the XIII-XIII line | wire of FIG. It is sectional drawing which shows the other modification of a tank. It is sectional drawing of the tank which follows the XV-XV line | wire of FIG. It is a perspective view which shows the cross section of the tank which follows the XVI-XVI line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing, three axes X, Y, and Z that are orthogonal to each other are set and described.

  In the EGR cooler 1 shown in FIG. 1, EGR gas recirculated to the engine (not shown) passes as indicated by an arrow A, and engine coolant (medium) circulates as indicated by an arrow B. The EGR cooler 1 is a heat exchanger that cools high-temperature EGR gas with a coolant.

  The engine includes an EGR passage (not shown) that recirculates a part of the exhaust discharged from the cylinder (not shown) as EGR gas to the cylinder.

  The engine includes a coolant circuit (not shown) through which coolant circulates. In the coolant circuit, coolant sent by a pump (not shown) circulates between a water jacket (not shown) and a radiator (not shown).

  A pair of headers 11 for guiding EGR gas are provided at both ends of the shell 10. An EGR gas pipe (not shown) that constitutes an EGR passage is connected to each header 11 via each flange portion 21.

  As shown in FIG. 2, the EGR cooler 1 includes a cylindrical shell 10 and a core 19 accommodated inside the shell 10.

  The core 19 is formed by stacking a plurality of tubes 12 in the X-axis direction. Each tube 12 extends in the Y-axis direction and the Z-axis direction, and is arranged so as to be arranged at intervals in the X-axis direction.

  Each tube 12 is formed in a flat cylindrical shape and has heat transfer fins 13 inside thereof. Both ends (not shown) of each tube 12 open into each header 11. An EGR gas flow path 14 through which EGR gas flows is provided inside each tube 12.

  During operation of the engine, EGR gas flows into each tube 12 in the core 19 through one header 11 as indicated by an arrow A in FIG. The EGR gas flows through each tube 12 in the Y-axis direction and then flows out through the other header 11.

  Inside the shell 10, a medium flow path 18 that circulates a coolant around each tube 12 is provided. The inside of the core 19 is partitioned into an EGR gas flow path 14 and a medium flow path 18 by each tube 12.

  The shell 10 is provided with an introduction pipe 15 and a tank 30 through which the cooling liquid flows in, and a lead-out pipe 16 through which the cooling liquid flows out. Pipes (not shown) constituting a coolant circuit are connected to the introduction pipe 15 and the lead-out pipe 16, respectively.

  During the operation of the engine, the coolant flows into the shell 10 through the introduction pipe 15 and the tank 30 as indicated by an arrow B. The cooling liquid flows around each tube 12 in the medium flow path 18 in the shell 10, and then flows out through the outlet pipe 16. In the core 19, the EGR gas is cooled by transferring the heat of the passing EGR gas to the circulating coolant through each tube 12.

  As shown in FIGS. 3 and 4, the tank 30 includes an inlet 31 through which the cooling liquid guided from the introduction pipe 15 flows, an outlet 39 through which the cooling liquid flows out to the core 20, and a cooling liquid from the inlet 31 to the outlet 39. An inner surface 32 that leads to the inner surface, and a guide rib 33 that protrudes from the inner surface 32 in a plate shape.

  The inlet 31 is an opening of the tank 30 to which the introduction pipe 15 is connected. The inlet 31 and the introduction pipe 15 form an inlet channel 41 through which the coolant flows. The inlet channel 41 is formed as a cylindrical space. The flow path center line O31 of the inlet 31 is disposed so as to extend in the stacking direction (X-axis direction) of the tubes 12 when viewed from above (Z-axis direction).

  The outlet 39 is an opening of the tank 30 connected to the inlet 17 of the shell 10. The outlet 39 forms an outlet channel 46 through which the coolant flows out. The outlet channel 46 is formed as a space having a substantially rectangular cross-sectional shape. A flow path center line O39 of the outlet 39 is disposed so as to extend in the Z-axis direction.

  With the above configuration, the inlet 31 and the outlet 39 of the tank 30 are disposed so as to be inclined substantially orthogonal to each other.

  The inner surface 32 of the tank 30 sandwiches the first guide surface 32A and the second guide surface 32B and the first guide surface 32A and the second guide surface 32B that direct the flow direction of the coolant flowing from the inlet 31 toward the outlet 39. A first side surface 32C and a second side surface 32D.

  The first guide surface 32 </ b> A, the first side surface 32 </ b> C, and the second side surface 32 </ b> D are arranged to extend substantially parallel to the flow path center line O <b> 31 of the inlet 31. The first guide surface 32A is formed in a planar shape extending in the X-axis direction and the Y-axis direction. The first side surface 32C and the second side surface 32D are formed in a planar shape extending in the X-axis direction and the Z-axis direction, and are substantially orthogonal to the first guide surface 32A.

  The second guide surface 32B is formed in a planar shape that is inclined with respect to the flow path center line O31 of the inlet 31. The second guide surface 32 </ b> B faces the inlet 31 and the outlet 39 and directs the flow direction of the coolant flowing in from the inlet 31 toward the outlet 39.

  The guide rib 33 protrudes from the first guide surface 32A and the first side surface 32C. The space in the tank 30 is divided into an upper flow path 42 and a lower flow path 43 by the guide rib 33.

  The guide rib 33 has a tip 33A that faces the core 20 and a side end 33B that faces the second side surface 32D. The tip 33A and the side end 33B are formed so as to be substantially orthogonal to each other. The tip 33A extends in the Y-axis direction, and the side end 33B extends in the Z-axis direction.

  As shown in FIG. 2, a first intermediate flow path 44 is formed between the tip 33 </ b> A of the guide rib 33 and the core 20. The first intermediate flow path 44 is formed as a space extending in the Y-axis direction and the Z-axis direction.

  As shown in FIG. 3, a second intermediate flow path 45 is formed between the side end 33B of the guide rib 33 and the second side surface 32D. The second intermediate flow path 45 is formed as a space extending in the Y-axis direction and the Z-axis direction.

  The guide rib 33 is formed so that its side end 33B extends in the vicinity of the flow path center line O31 of the inlet 31 when viewed from above (Z-axis direction). Thereby, the guide rib 33 is arrange | positioned so that it may oppose a part (substantially half) of the inlet 31 seeing from a X-axis direction.

  The guide rib 33 is formed in a flat plate shape that is substantially orthogonal to the flow path center line O31 of the inlet 31 and extends in the X-axis direction and the Z-axis direction.

  When the engine is in operation, the coolant flows into the tank 30 through the introduction pipe 15 and the inlet 31 as indicated by an arrow B. In the tank 30, a flow toward the core 20 guided by the guide rib 33 as indicated by an arrow C in FIGS. 2 and 4, and a flow through the first intermediate flow path 44 to the core 20 as indicated by an arrow D. As shown by the arrow E, the flow toward and the flow toward the core 20 through the second intermediate flow path 45 are generated. Thereby, the deviation of the flow rate of the coolant flowing into the core 20 can be sufficiently suppressed, and the flow rate difference of the coolant flowing between the tubes 12 can be reduced.

  As a comparative example, in an EGR cooler in which the tank 30 is not provided with the guide rib 33, the coolant is directed to the back side (left side in FIG. 2) of the tank 30 on the second guide surface 32B, and as shown by the arrow G in FIG. 2 concentrates on the left side, and as indicated by the arrow H, the flow of the coolant flowing into the right side in FIG. For this reason, in the part of the core 20 on the right side in FIG. 2, the coolant rises between the tubes 12 as indicated by the arrow F and flows toward the outlet 39. In such an operating state, the flow of the cooling water may stagnate in the medium flow path 18 near the outlet 39, and the temperature of the tube 12 may locally rise.

  On the other hand, in the EGR cooler 1, by providing the tank 30 with the guide ribs 33, as described above, the coolant can be prevented from being concentrated and flowing into a part of the core 20. For this reason, it is prevented that the temperature of the core 20 rises locally, and the heat resistance of the core 20 is ensured.

  The guide rib 33 is formed so as to extend in the longitudinal direction (Y-axis direction) of the tube 12. As a result, in the upper flow path 42 in the tank 30, the coolant flowing from the inlet 31 and bent by the guide rib 33 flows in the stacking direction (X-axis direction) of the tubes 12. For this reason, in the tank 30, the flow rate of the coolant distributed in the stacking direction (X-axis direction) of the tubes 12 is adjusted by the shape and arrangement of the guide ribs 33.

  In the lower flow path 43 in the tank 30, the cooling liquid flows toward the core 20 through the first intermediate flow path 44 and the second intermediate flow path 45 that bypass the guide rib 33, thereby causing stagnation in the flow of the cooling liquid. Is suppressed.

  As shown in FIG. 3, the guide rib 33 is formed so as to be aligned with the flow path center line O39 of the outlet 46 in the stacking direction (X-axis direction) of the tubes 12. The guide ribs 33 are disposed so as to face the central portion of the core 20 in the stacking direction (X-axis direction) of the tubes 12. Thereby, in the tank 30, since the volume of the upper flow path 42 and the lower flow path 43 partitioned by the guide ribs 33 is sufficiently ensured, the stagnation of the flow of the cooling liquid is suppressed, and the cooling liquid flows smoothly.

  Next, a modified example of the tank 30 shown in FIGS. 5 to 7 will be described.

  The guide rib 33 is formed at a position closer to the inlet 31 than the flow path center line O39 of the outlet 46 in the stacking direction (X-axis direction) of the tubes 12. The guide ribs 33 are arranged so as to face each other in a position closer to the inlet 31 than the central portion of the core 20 in the stacking direction (X-axis direction) of each tube 12.

  As a result, in the tank 30, as indicated by an arrow C, the coolant is guided by the guide rib 33 and the force of the flow toward the core 20 is increased. For this reason, the flow rate of the coolant flowing into the right part of the core 20 in FIG. 5 is secured, and it is effectively prevented that the flow between the tubes 12 and the flow toward the outlet 39 occurs as shown by the arrow F. it can.

  Next, another modification of the tank 30 shown in FIGS. 8 to 10 will be described.

  The guide rib 33 is formed in a flat plate shape inclined with respect to the flow path center line O31 of the inlet 31. The guide rib 33 constitutes an inclined portion that is inclined upward facing the second guide surface 32B. The guide rib 33 is inclined so that the distal end 33A approaches the inlet 31 from the base end 33C.

  As a result, in the tank 30, the force of the flow toward the core 20 is increased by being guided by the guide rib 33 in which the coolant is inclined as indicated by the arrow C.

  Next, another modified example of the tank 30 shown in FIGS. 11 to 13 will be described.

  The guide rib 33 includes a flat plate-like orthogonal portion 33D substantially orthogonal to the flow path center line O31 of the inlet 31, and a plate-like curved portion 33E that curves so as to approach the inlet 31 from the orthogonal portion 33D to the tip 33A. Have.

  As a result, in the tank 30, as indicated by an arrow C, the coolant is guided by the orthogonal portion 33 </ b> D and the curved portion 33 </ b> E of the guide rib 33 and the force of the flow toward the core 20 is increased.

  Next, another modification of the tank 30 shown in FIGS. 14 to 16 will be described.

  The guide rib 33 has a flat plate-shaped inclined portion 33F that is inclined with respect to the flow path center line O31 of the inlet 31, and a plate-shaped curved portion 33G that is curved so as to approach the inlet 31 from the inclined portion 33F to the tip 33A. .

  Thereby, in the tank 30, as indicated by an arrow C, the coolant is guided by the inclined portion 33 </ b> F and the curved portion 33 </ b> G of the guide rib 33, and the force of the flow toward the core 20 is increased.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, in the above embodiment, the core 20 has an EGR gas flow path 14 for EGR gas formed inside the tube 12, and a coolant liquid medium flow path 18 formed outside the tube 12. Not limited to this, the core 20 may have a configuration in which an EGR gas flow path 14 for EGR gas is formed outside a tube (not shown), and a medium flow path 18 for cooling liquid is formed inside the tube. In this case, a plate (not shown) in which the tubes are opened side by side is coupled to the tank 30.

  The present invention can be applied not only to an EGR cooler but also to a heat exchanger such as a charge air cooler mounted on a vehicle. Moreover, it is applicable also to the heat exchanger used other than a vehicle.

1 EGR cooler (heat exchanger)
12 Tube 14 EGR gas flow path 18 Medium flow path 20 Core 30 Tank 31 Inlet
32B guide surface
32C 1st side surface 32D 2nd side surface 33 Guide rib 33A Front end 33B Side end 39 Outlet 44 1st intermediate flow path 45 2nd intermediate flow path 33E, 33G Bending part 33F Inclination part

Claims (6)

A core in which heat is exchanged between the circulating medium and the passing fluid;
A heat exchanger comprising a tank for guiding a medium to the core,
The tank
An inlet through which the medium flows,
An outlet for allowing media to flow into the core;
A guide surface that guides the medium from the inlet to the outlet;
A first side surface and a second side surface facing each other across the guide surface;
A guide rib that protrudes from the guide surface and the first side surface and directs the flow direction of the medium toward the outlet,
The guide rib is
A tip that forms a first intermediate channel through which a medium flows between the core and the core;
And a side end forming a second intermediate flow path through which the medium flows between the second side surface and the second side surface. The heat exchanger according to claim 1,
The core includes a plurality of tubes stacked so as to partition a medium flow path through which a medium flows and an EGR gas flow path through which EGR gas flows.
The heat exchanger according to claim 1, wherein the guide rib extends along a longitudinal direction of the tube. The heat exchanger according to claim 1 or 2,
The heat exchanger according to claim 1, wherein the guide rib faces the central portion of the core in the tube stacking direction. The heat exchanger according to claim 1 or 2,
The heat exchanger according to claim 1, wherein the guide rib is opposed to a position closer to the inlet than a central portion of the core in the stacking direction of the tubes. The heat exchanger according to any one of claims 1 to 4,
The heat exchanger according to claim 1, wherein the guide rib has an inclined portion that is inclined so that the tip approaches the inlet. A heat exchanger according to any one of claims 1 to 5,
The heat exchanger according to claim 1, wherein the guide rib has a curved portion that curves so that the tip approaches the inlet.