JP2020003208A - Heat exchanger - Google Patents

Abstract

To provide a communication passage 43 which allows communication between a lower oil vertical passage L2B and an oil outlet vertical passage L3 and concurrently achieve reduction of the weight by reducing a thickness of a distance plate 13.SOLUTION: A heat exchanger includes: a core 11 in which oil passages 21 and coolant passages 22 are alternately formed between a number of laminated core plates 15 and a vertical passage L2 and an outlet vertical passages L3, in which oil flows, are formed along a lamination direction; a base plate 12 in which passage ports 31, 32 are opened; and a distance plate 13 disposed between the base plate 12 and the core 11. The vertical passage L2 and the outlet vertical passage L3 are disposed at a spacing from each other in a direction orthogonal to the lamination direction. The distance plate 13 has: a bottom wall part 33 joined to an upper surface of the base plate 12 and having a thin plate form; and an expansion part 40 forming a communication passage 43 which allows communication between the vertical passage L2 and the outlet vertical passage L3. A flange part 42 of a peripheral edge of an opening 41 of the expansion part 40 is joined to a lowermost surface of the core 11.SELECTED DRAWING: Figure 14

Description

  The present invention relates to an improvement of a heat exchanger applied to an oil cooler or the like of a vehicle.

  Patent Document 1 discloses an oil cooler for a vehicle as a heat exchanger. In this oil cooler, a large number of core plates are stacked, and an oil passage (first medium passage) through which oil (first medium) flows between adjacent core plates and cooling water (second medium) flow. Cooling water passages (second medium passages) are alternately formed in the stacking direction, and a core in which a vertical passage through which oil or cooling water flows is formed along the stacking direction, and a passage port connected to the vertical passage. The base plate has an opening and is thicker than the core plate, and a distance plate interposed between the base plate and the core. The distance plate has a plate shape thicker than the core plate, and a communication passage (bypass passage) that communicates the above-described vertical passage and the passage port is formed through the distance plate.

Japanese Patent No. 5161709

  When the vertical passage provided in the core and the passage port provided in the base plate are not arranged coaxially, and both are arranged in a direction perpendicular to the lamination direction (direction along the plane of the distance plate), The communication path is formed as a slit-like hole elongated in a direction along the surface of the distance plate. The same configuration applies when a plurality of vertical passages provided in the core communicate with each other on the base plate side.

  In order to suppress the pressure loss in the communication passage, it is necessary to secure a large passage cross-sectional area of the communication passage. However, if the opening area of the communication path is increased, the rigidity of the distance plate is reduced, and the rigidity of the heat exchanger is reduced. Also, if the dimension (wall thickness) in the thickness direction of the distance plate is set to be large in order to increase the passage cross-sectional area of the communication passage, not only the height of the heat exchanger itself increases, but also the layout property is lowered, This causes an increase in the weight of the entire heat exchanger.

  The present invention has been made in view of such circumstances. That is, in the heat exchanger according to the present invention, a large number of core plates are stacked, and the first medium passage through which the first medium flows and the second medium passage through which the second medium flows between adjacent core plates. A core formed alternately in the stacking direction and having a plurality of vertical passages through which the first medium or the second medium flows along the stacking direction; a base plate; and a base plate between the base plate and the core. And a distance plate interposed between them.

  The plurality of vertical passages are arranged apart from each other (offset) in a direction orthogonal to the stacking direction. The distance plate is expanded in the stacking direction from the bottom wall so as to surround a thin bottom wall joined to the upper surface of the base plate and a communication path connecting the plurality of vertical passages. And a protruding and elongated bulging portion.

  The bulging portion has an opening formed between the plurality of vertical passages except for a flange portion at the tip over the entire circumference, and the flange portion is formed on the lower surface of the lowermost core plate of the core. The communication path is formed by a space that is joined and surrounded by the inner wall surface of the bulging portion, the upper surface of the base plate, and the lower surface of the lowermost core plate of the core.

  In a preferred aspect, an auxiliary passage through which the first medium or the second medium flows is formed between an upper surface of a bottom wall portion of the distance plate and a lower surface of the lowermost core plate, The auxiliary passage and the communication passage are separated by the bulging portion.

  In another preferred aspect, the distance plate has a plurality of dimples projecting upward from an upper surface of the bottom wall portion and having a leading end in contact with a lower surface of the lowermost core plate.

  According to the present invention, while the distance plate joined to the base plate is made thinner and lighter, the bulging portion is provided on the bottom wall portion of the distance plate, so that the vertical passages are formed inside the bulging portion. A communication path communicating with each other can be provided. Since the bulging portion has the opening, the communication passage is formed between the upper surface of the base plate and the lower surface of the lowermost core plate, and a large passage cross-sectional area can be obtained.

FIG. 2 is a perspective view of an oil cooler serving as a first reference example. The top view of the said oil cooler. Sectional drawing which follows the AA line of FIG. FIG. 3 is an exploded perspective view of the oil cooler. FIG. 4 is a perspective view of a distance plate of the first reference example. FIG. 9 is a perspective view of a distance plate of a comparative example. The perspective view of the oil cooler used as the 2nd reference example. The top view of the oil cooler of the said 2nd reference example. FIG. 9 is a sectional view taken along the line BB of FIG. 8. FIG. 9 is a sectional view taken along line CC of FIG. 8. FIG. 6 is an exploded perspective view of the oil cooler of the second reference example. FIG. 9 is a perspective view of a distance plate according to the second reference example. FIG. 9 is a perspective view of a distance plate of a comparative example. 1 is an exploded perspective view of an oil cooler according to one embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 5 show, as a first reference example, an oil cooler that cools, for example, lubricating oil for an internal combustion engine of a vehicle or oil serving as hydraulic oil for an automatic transmission by heat exchange with cooling water. In the following, the terms “up” and “down” are used as necessary with reference to the posture of FIG. 3 to facilitate understanding, and more specifically, the base plate 12 is moved from the base plate 12 to the core 11 in the laminating direction described later. Although the direction in which the oil cooler moves is defined as the “upward” direction, it is not limited to the mounting posture of FIG. 3 when an actual oil cooler is used.

  The oil cooler includes a core 11 formed by stacking a number of thin core plates 15 together with fin plates 16, a relatively thick plate base plate 12, and a distance plate interposed between the core 11 and the base plate 12. 13, and a top plate 14 that is thicker than the core plate 15 is stacked on the core 11. Each component of the oil cooler is made of an aluminum-based material, and after being assembled in a predetermined state, is heated in a furnace while being held by a jig, and is brazed integrally with each part. As a method of supplying the brazing material, the core plate 15 and the like are formed as a so-called clad material in which a surface of a base material made of an aluminum-based material is coated with a brazing material (for example, an aluminum-based material having a lower melting point than the base material). Alternatively, another brazing material in the form of a sheet or the like may be arranged on the joining surface.

  As shown in FIG. 4, the core 11 is formed by laminating a large number of shallow dish-shaped core plates 15 having the same basic shape together with the fin plates 16 to form two adjacent core plates 15. An oil passage 21 (see FIG. 3) as a first medium passage through which oil as a first medium flows, and a cooling water passage 22 as a second medium passage through which cooling water as a second medium flows (See FIG. 3) are alternately formed in the laminating direction. The core plate 15 actually includes a plurality of types of core plates 15 having different details, and these are appropriately combined. It is roughly divided into a lower core plate 15A located below the oil passage 21 and an upper core plate 15B located above the oil passage 21. The fin plate is located between the two (that is, inside the oil passage 21). The layers 16 are sequentially stacked with the layers 16 interposed therebetween. The rectangular core plate 15 has peripheral flange portions 17 rising in a tapered shape around the four sides thereof, and these peripheral flange portions 17 are brazed in a state of being overlapped and laminated, so that the oil passage 21 is formed. And the cooling water passage 22 are defined alternately. In other words, this core 11 is a so-called housingless type in which a housing surrounding the oil passage 21 and the cooling water passage 22 is formed by overlapping and joining the peripheral flange portions 17 of the plurality of core plates 15. It has a structure.

  These core plates 15 have circular oil communication holes 23 formed at two corners on one diagonal line, and circular cooling water communication holes at two corners on the other diagonal line. An opening 24 is formed, and a circular oil outlet hole 25 is formed at the center position. The oil communication holes 23, the cooling water communication holes 24, and the oil outlet holes 25 are provided at positions aligned in the stacking direction with respect to the plurality of core plates 15 constituting the core 11. The circular boss portions 23A, 24A, 25A provided around the holes 23, 24, 25 are joined to each other, so that the oil passage 21 and the cooling water passage 22 at each stage are sealed, respectively. As described later, vertical passages L1 to L3, W1, and W2 are arranged in the stacking direction. The boss portions 23A, 24A, and 25A have different bulging directions in the lower core plate 15A and the upper core plate 15B.

  Each core plate 15 has a large number of hemispherical or truncated cone-shaped dimples 26 protruding toward the cooling water passage 22. As shown in FIG. 3, these dimples 26 are located in the cooling water passages 22, respectively, and the tops of the dimples 26 of the lower core plate 15A and the tops of the dimples 26 of the upper core plate 15B abut each other, so that the soldering is performed. It is joined by attaching.

  Although not shown in detail, the fin plate 16 has a general configuration including fine fins, and corresponds to the positions of the oil communication holes 23, the cooling water communication holes 24, and the oil outlet holes 25 of the core plate 15. And circular openings 23B, 24B and 25B.

  Also, this example is configured as a so-called multi-pass type oil cooler, in which a plurality of oil passages 21 are stacked, and a core plate 15 (lower core core) constituting an oil passage 21 corresponding to an intermediate stage is provided. In the middle lower core plate 15C, which is one of the plate 15A and the upper core plate 15B), one of the oil communication holes 23 is sealed as a sealing portion 23C.

  Since the uppermost upper core plate 15D located above the uppermost oil passage 21 is in close contact with the top plate 14, no dimple 26 is provided. As the oil communication hole 23, only one oil communication hole 23D is formed as a simple hole having no boss 23A. The lowermost lower core plate 15 </ b> E located below the lowermost oil passage 21 is joined to the distance plate 13, and thus has no dimple 26. As the oil communication hole 23, only one oil communication hole 23E is formed as a simple hole having no boss 23A.

  The top plate 14 superposed on the top of the core 11 formed by stacking the plurality of core plates 15 is brazed to the upper surface of the uppermost upper core plate 15D, and the top bulge extending along the diagonal line. A top portion which has an outlet portion 18 and communicates an oil communication hole 23D provided at a corner and an oil outlet hole 25 provided at the center between the top bulge portion 18 and the uppermost upper core plate 15D. A communication passage 19 (see FIG. 3) is formed.

  The base plate 12 has mounting portions 27 having mounting holes 27A at four corners, an oil inlet passage port 28 is formed at a position corresponding to one oil communication hole 23 of the core plate 15, and the other oil passage port 28 is formed. An oil outlet passage port 29 is formed at a position corresponding to the communication hole 23. A cooling water inlet passage port 31 is formed at a position corresponding to one of the cooling water communication holes 24 of the core plate 15, and a cooling water outlet passage port 32 is formed at a position corresponding to the other cooling water communication hole 24. An opening is formed. The oil cooler is mounted on a control valve housing or the like on the internal combustion engine / automatic transmission side via the mounting portion 27, and an oil inlet passage port 28 and an oil outlet passage port 29 are respectively connected to the oil passage on the internal combustion engine / automatic transmission side. And the cooling water inlet passage port 31 and the cooling water outlet passage port 32 are respectively connected to the cooling water passage side of the internal combustion engine / automatic transmission.

  Next, the distance plate 13 will be described with reference to FIG. FIG. 5 is a perspective view showing the distance plate 13 alone. The distance plate 13 is thicker than the core plate 15 but much thinner than the base plate 12, and has a rectangular shallow dish shape like the core plate 15. The distance plate 13 has a thin plate-shaped bottom wall portion 33 that is closely and joined to the upper surface of the base plate 12 by brazing, and the periphery flange portion 17 of the core plate 15 is provided around four sides of the bottom wall portion 33. Similarly to the above, a peripheral flange portion 17A rising in a tapered shape is provided. The peripheral flange portion 17A is overlapped with the peripheral flange portion 17 of the lowermost lower core plate 15E and then joined by brazing.

  Similarly to the core plate 15, a large number of hemispherical or truncated cone-shaped dimples 26A projecting in the laminating direction are formed on the bottom wall portion 33, and the tips of the dimples 26A are connected to the lowermost lower core plate 15E. It contacts the lower surface and is joined by brazing.

  As shown in FIG. 3, between the upper surface of the bottom wall portion 33 and the lower surface of the lowermost lower core plate 15E, an auxiliary passage 34 as a space through which cooling water or oil flows is liquid-tightly defined. ing. In the first embodiment, the cooling water flows through the auxiliary passage 34. Specifically, a cooling water inlet communication hole 35 and a cooling water outlet communication hole 36 are opened in the bottom wall portion 33 at positions corresponding to the cooling water inlet passage port 31 and the cooling water outlet passage port 32 of the base plate 12, respectively. Is formed. The cooling water inlet communication hole 35 and the cooling water outlet communication hole 36 are formed as simple holes without a boss. Therefore, as shown by the broken arrow W3 in FIG. 4, a part of the cooling water introduced from the cooling water inlet passage port 31 through the cooling water inlet communication hole 35 flows through the inside of the auxiliary passage 34, and communicates with the cooling water outlet communication. The cooling water is discharged from the cooling water outlet passage port 32 through the hole 36.

  Further, an oil inlet communication hole 37 is formed in the bottom wall portion 33 at a position corresponding to the oil inlet passage port 28 of the base plate 12. Around the oil inlet communication hole 37, a circular boss portion 37A that protrudes in the laminating direction is provided. The tip of the boss portion 37A is joined to the lower surface around the oil communication hole 23E of the lowermost lower core plate 15E, so that the auxiliary passage 34 through which the cooling water flows and the oil communication hole 23E (that is, a lower portion described later). Side oil vertical passage L1A) is liquid-tightly partitioned.

  Here, the oil outlet hole 25 located at the center of the lowermost lower core plate 15E and the oil outlet passage port 29 located offset to the corner of the base plate 12 are spaced apart in a direction orthogonal to the laminating direction. A swelling portion 40 swelling from the bottom wall portion 33 in the laminating direction is formed over a slender elliptical range along a diagonal line so that the two can communicate with each other. The flange portion 42 at the tip of the bulging portion 40 is bent inwardly in a flange shape over the entire circumference, and an opening portion 41 that is largely open in an elliptical shape is formed inside the flange portion 42. In other words, at the tip of the bulging portion 40, a flange portion 42 substantially parallel to the bottom wall portion 33 is left around the entire periphery of the opening portion 41, and the upper surface of the flange portion 42 is the lowermost lower core. The lower surface of the plate 15E is closely and joined by brazing. More specifically, at one end near the center of the bulging portion 40, the flange portion 42 at the tip of the bulging portion 40 is joined to the lower surface around the oil outlet hole 25 in the lowermost lower core plate 15E, and On the other end near the corner of the bulging portion 40, the bottom wall 33 around the bulging portion 40 is joined to the upper surface around the oil outlet passage port 29 in the base plate 12.

  The space inside the bulging portion 40, that is, the space surrounded by the inner wall surface of the bulging portion 40, the upper surface of the base plate 12, and the lower surface of the lowermost lower core plate 15E is the oil of the lowermost lower core plate 15E. The outlet hole 25 (that is, the oil outlet vertical passage L3) and the oil outlet passage port 29 are connected to each other, and formed as a communication passage 43 that connects the two.

  In a state where the above components are stacked and brazed integrally, as shown in FIGS. 3 and 4, several longitudinal passages L1 to L3, W1, which are continuous in the stacking direction, are formed in the core 11. W2 is formed, and oil is guided from the oil inlet passage port 28 to the oil outlet passage port 29 through the oil passages 21 of the respective stages through the longitudinal passages L1 to L3, W1 and W2. The cooling water is guided from the cooling water inlet passage port 31 to the cooling water outlet passage port 32 through the cooling water passage 22. In FIG. 4, the flow of oil is represented by solid arrows, and the flow of cooling water is represented by broken arrows.

  Specifically, the oil vertical passage L1 formed by stacking one oil communication hole 23 of each core plate 15 aligned above the oil inlet passage port 28 and the other oil communication hole 23 are stacked. And an oil outlet vertical passage L3 formed by stacking the central oil outlet hole 25 are formed as oil vertical passages extending in the stacking direction in the core 11. Further, the oil vertical passage L1 is divided into a lower oil vertical passage L1A and an upper oil vertical passage L1B by an intermediate sealing portion 23C.

  The lower oil vertical passage L1A has a lower end opening toward the oil inlet passage port 28 and is linearly connected to the oil inlet passage port 28. The upper oil vertical passage L <b> 1 </ b> B has an upper end opening toward a top communication passage 19 formed by the top plate 14. These oil vertical passages L1A, L1B communicate with respective oil passages 21 between the core plates 15A, 15B.

  The oil vertical passage L2 formed by the other oil communication hole 23 has an upper end sealed by the uppermost upper core plate 15D and a lower end sealed by the lowermost lower core plate 15E. The oil vertical passage L2 also communicates with each oil passage 21 between the core plates 15A and 15B.

  The center oil outlet vertical passage L3 has an upper end opening toward the top communication passage 19 formed by the top plate 14, and has an opening 41 formed in the bulging portion 40 of the distance plate 13 (that is, an opening 41). The lower end is open toward one end near the center of the communication passage 43). The oil outlet vertical passage L3 is separated and independent from the oil passage 21 between the core plates 15A and 15B, and the oil is guided only in the stacking direction. The lower end of the oil outlet vertical passage L3 communicates with the oil outlet passage port 29 provided at the corner of the base plate 12 through the communication passage 43.

  Also, as shown by the dashed arrows in FIG. 4, the cooling water communication holes 24 of each core plate 15 are laminated, so that a pair of cooling water vertical along the laminating direction is formed similarly to the oil vertical passages L1, L2. Passages W1 and W2 are configured. The cooling water inlet vertical passage W1 has an upper end sealed by the uppermost upper core plate 15D, a lower end opening toward the cooling water inlet passage port 31, and a straight line extending to the cooling water inlet passage port 31. It is connected to the. The other cooling water outlet vertical passage W2 has an upper end sealed by the uppermost upper core plate 15D, a lower end opening toward the cooling water outlet passage port 32, and a straight line extending to the cooling water outlet passage port 32. It is connected to the. These cooling water vertical passages W1 and W2 communicate with the cooling water passage 22 between the core plates 15A and 15B, respectively. Therefore, the cooling water flowing from the cooling water inlet passage port 31 flows upward through the cooling water inlet vertical passage W <b> 1, and is guided to the cooling water passage 22 of each stage of the core 11. The cooling water that has exchanged heat with the oil when flowing through the cooling water passages 22 of each stage flows out to the cooling water outlet vertical passage W2 on the opposite side, and flows downward through the cooling water outlet vertical passage W2 to form the cooling water outlet passage. Flows out to port 32.

  Next, the flow of the oil will be described. As shown by solid arrows in FIGS. 3 and 4, the oil flowing from the oil inlet passage port 28 flows upward through the lower oil vertical passage L1A, and It is guided to the oil passage 21 of each stage located in the half part. The oil that has exchanged heat with the cooling water in the oil passages 21 of each stage flows out to the opposite oil vertical passage L2 and also flows upward (that is, to the top side) through the oil vertical passage L2. It is guided to the oil passage 21 of each stage located. That is, it flows in the core 11 so as to make a U-turn from the lower half region to the upper half region. The oil further cooled in the oil passages 21 of the respective stages in the upper half flows out to the upper oil vertical passage L1B, flows upward through the upper oil vertical passage L1B, and passes through the top communication passage 19 to the central oil outlet vertical passage. It is led to passage L3. The oil flows downward in the oil outlet vertical passage L3, and flows out to the oil outlet passage port 29 via the communication passage 43 of the distance plate 13.

  FIG. 6 shows a distance plate 13B of a comparative example. This distance plate 13B has a thicker plate shape than the distance plate 13 shown in FIG. 5, and the entire lower surface thereof is closely attached to and joined to the upper surface of the base plate 12, and the entire upper surface is the lowermost lower core plate 15E. Is closely and joined to the lower surface of the main body. In addition to the cooling water inlet communication hole 35, the cooling water outlet communication hole 36, and the oil inlet communication hole 37, a slit-shaped communication hole 45 is formed in the distance plate 13B so as to correspond to the communication passage 43 of the present embodiment. Is formed.

  The characteristic configuration of the above-described reference example and its operation and effect will be described in comparison with such a comparative example. First, in the reference example, the distance plate 13 is sufficiently thinner than the comparative example, so that the weight can be reduced.

  Further, a swelling portion 40 swelling from the bottom wall portion 33 of the distance plate 13 in the laminating direction is provided, and a flange portion 42 at the tip thereof is joined to the lower surface of the lowermost lower core plate 15E constituting the lowermost surface of the core 11. By doing so, a communication passage 43 that connects the oil outlet vertical passage L3 of the core 11 and the oil outlet passage port 29 of the base plate 12 that are separated from each other can be formed inside the bulging portion 40. That is, the communication path 43 can be provided in the distance plate 13 while making the distance plate 13 thinner than the comparative example.

  Further, an auxiliary passage 34 through which cooling water flows is formed between the upper surface of the bottom wall portion 33 of the distance plate 13 and the lower surface of the lowermost lower core plate 15E, and the auxiliary passage 34 and the communication passage 43 protrude. It is partitioned liquid-tight by a part 40. Therefore, the auxiliary passage 34 through which the cooling water flows functions as a cooling water passage for performing heat exchange with the lowermost oil passage 21 of the adjacent core 11, and is smaller than the case where the distance plate 13B of the comparative example is used. Thus, the amount of heat exchange can be increased in the same package.

  In addition, since the distance plate 13 is formed with a plurality of dimples 26A projecting upward from the upper surface of the bottom wall portion 33 and having tips joined to the lower surface of the lowermost lower core plate 15E, as described above, the distance While the thickness of the plate 13 is reduced, the rigidity of the distance plate 13 in the laminating direction can be sufficiently ensured.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the following, only points different from the first reference example will be mainly described, and redundant description will be omitted as appropriate.

  In the second embodiment, the position of the oil passage port formed in the base plate 12 is different from that of the first embodiment due to the passage layout on the internal combustion engine / automatic transmission side. The flow of oil inside is also different.

  Specifically, as shown in FIG. 11, an oil inlet passage port 28A is formed in the vicinity of the center of the base plate 12 and is different from a diagonal line where the cooling water inlet passage port 31 and the cooling water outlet passage port 32 are arranged. An oil outlet passage port 29A is formed at one diagonal corner. The core 11 has a layout in which the sealing portion 23C, the oil communication hole 23E, the lower oil vertical passage L1A, and the upper oil vertical passage L1B are arranged on the diagonally opposite sides with respect to the first embodiment. ing.

  As shown in FIG. 12, the distance plate 13A is configured such that oil flows through an auxiliary passage 34 formed therein, and in this relation, the cooling water inlet communication disposed on one diagonal line is provided. Bosses 35A and 36A joined to the lowermost lower core plate 15E are respectively provided around the hole 35 and the cooling water outlet communication hole 36, and an oil outlet communication hole 38 formed at the other diagonal corner is provided. The opening is formed as a simple hole having no boss. The bulging portion 40A formed in the distance plate 13A is bent in a substantially L shape so as to bypass the central oil outlet vertical passage L3, and a communication passage 43A formed inside the bulging portion 40A. Thereby, the oil inlet passage port 28A provided near the center of the base plate 12 communicates with the lower oil vertical passage L1A provided at the corner of the core 11.

  The oil flow will be described. As shown by solid arrows in FIGS. 10 and 11, the oil flowing from the oil inlet passage port 28A passes through the communication passage 43A formed in the distance plate 13A to the lower oil vertical passage L1A. The core 11 flows upward through the lower oil vertical passage L1A and is guided to the oil passages 21 of each stage located in the lower half of the core 11. The oil that has exchanged heat with the cooling water in the oil passages 21 of each stage flows out to the opposite oil vertical passage L2 and also flows upward (that is, to the top side) through the oil vertical passage L2. It is guided to the oil passage 21 of each stage located. That is, similarly to the first embodiment, the flow flows in the core 11 so as to make a U-turn from the lower half region to the upper half region. The oil further cooled in the oil passages 21 of the respective stages in the upper half flows out to the upper oil vertical passage L1B, flows upward through the upper oil vertical passage L1B, and passes through the top communication passage 19 to the central oil outlet vertical passage. It is led to passage L3. Oil flows downward in the oil outlet vertical passage L3, and flows out to the oil outlet passage port 29A via the auxiliary passage 34 of the distance plate 13A and the oil outlet communication hole 38.

  The distance plate 13A connects the (lower end of) the oil outlet vertical passage L3 and the oil outlet communication hole 38 so as not to obstruct the flow of oil from the oil outlet vertical passage L3 to the oil outlet communication hole 38. The dimple 26A is omitted in the vicinity of the range, and the upper surface of the flat bottom wall portion 33 extends.

  FIG. 13 shows a distance plate 13C of a comparative example. This distance plate 13C has a thicker plate shape than the distance plate 13A of the second reference example shown in FIG. 12, and the entire lower surface thereof is closely contacted with and joined to the upper surface of the base plate 12, and the entire upper surface thereof is the smallest. The lower stage lower core plate 15E is closely joined to the lower surface of the lower stage core plate 15E. In addition to the cooling water inlet communication hole 35 and the cooling water outlet communication hole 36, a slit-shaped communication hole 46 is formed in the distance plate 13C so as to correspond to the communication passage 43A of the second reference example. As a configuration corresponding to the auxiliary passage 34 of the second reference example, another slit-shaped communication hole 47 is formed to penetrate.

  The configuration of the second reference example and its operation and effect will be described in comparison with such a comparative example. First, as in the first reference example, in the second reference example, the distance plate 13A can be reduced in weight by making the distance plate 13A thinner than in the comparative example, and the bulging portion 40A is formed in the distance plate 13A. The communication passage 43A that connects the oil inlet passage port 28A of the base plate 12 and the lower oil vertical passage L1A of the core 11 can be formed.

  Further, since the distance plate 13A is formed with a plurality of dimples 26A projecting upward from the upper surface of the bottom wall portion 33 and having tips joined to the lower surface of the lowermost lower core plate 15E, the distance plate 13A is laminated. The rigidity in the direction can be sufficiently ensured.

  In the comparative example shown in FIG. 13, since two slit-shaped communication holes 46 and 47 are formed close to each other, the communication holes 46 and 47 are formed to secure the rigidity of the bridge portion 48 between the two. And the size in the thickness direction needs to be secured to some extent. On the other hand, in the second comparative example, an auxiliary passage 34 through which oil flows is formed between the upper surface of the bottom wall portion 33 of the distance plate 13A and the lower surface of the lowermost lower core plate 15E. 34 and the communication passage 43A are liquid-tightly partitioned by a bulging portion 40A. The auxiliary passage 34 (and the oil outlet communication hole 38) is provided separately from the communication passage 43 </ b> A in the oil outlet vertical passage L <b> 3 provided near the center of the core 11 and the oil provided in the corner of the base plate 12. It functions as a communication passage that communicates with the outlet passage port 29A. Accordingly, there is no need to provide a bridge portion as in the comparative example, and the size of the communication passage 43A and the auxiliary passage 34 is not restricted, so that it is possible to secure a sufficient passage cross-sectional area and suppress passage resistance. In addition, since the size in the thickness direction is not restricted as in the comparative example, the size can be reduced by reducing the size in the stacking direction.

  As shown in FIG. 9, an oil inlet passage port 28 </ b> A opened near the center of the base plate 12 and an oil outlet longitudinal passage L <b> 3 extending in the stacking direction near the center of the core 11 partially overlap in the stacking direction. ing. The bulging portion 40A in the vicinity of the overlapping portion as described above rises from the bottom wall portion 33 in the vicinity of the oil inlet passage port 28A, and the flange portion 42 at the distal end is located around the oil outlet vertical passage L3. It is joined to the lower surface of the lower step lower core plate 15E.

  The broken line in FIG. 9 indicates the cross-sectional shape when the thick plate 13C of the comparative example shown in FIG. 13 is used. In this case, the distance plate 13C blocks the oil inlet passage port 28A and a part of the oil outlet vertical passage L3, so that the opening area is reduced and the passage resistance is increased.

  On the other hand, in the second comparative example, the bulging portion 40A has a shape in which the periphery of the oil inlet passage port 28A of the base plate 12 and the periphery of the oil outlet vertical passage L3 of the core 11 are obliquely connected. Unlike the comparative example, the oil inlet passage port 28A and the oil outlet longitudinal passage L3 are not partially closed, and the oil inlet passage port 28A and the oil outlet longitudinal passage L3 have a large opening area to reduce the passage resistance. The increase can be suppressed.

  FIG. 14 shows an embodiment of the present invention. In the following, only differences from the first and second reference examples will be described, and redundant description will be omitted as appropriate. In this embodiment, the oil flow is different from that of the first embodiment, and the oil passage port is provided on the top plate 14 instead of the base plate 12.

  Specifically, in this embodiment, the base plate 12 is not provided with an oil passage port serving as an oil inlet / outlet. On the other hand, a pair of oil passage ports (not shown) are opened at a pair of diagonally opposite ends along the top bulging portion 18 with respect to the top plate 14, and an oil inlet pipe 51 serving as an oil inlet / outlet and an oil An outlet pipe 52 is provided upright. The oil inlet pipe 51 is joined by brazing to an oil passage port (not shown) formed at a corner of the top plate 14 by brazing, and the oil outlet pipe 52 is provided at an end of the top bulging portion 18 near the outer periphery. Are joined by brazing around an oil passage port (not shown) formed on the upper surface side of the oil passage.

  In the uppermost upper core plate 15D, an oil communication hole 23F connected to the oil inlet pipe 51 is formed at a position corresponding to the oil inlet pipe 51, while an oil communication hole is formed at a position corresponding to the oil outlet pipe 52. Is not provided (or a closed portion is provided).

  In the middle stage lower core plate 15C, a closed portion 23C that closes the oil communication hole is provided at a position corresponding to the oil inlet pipe 51, and the oil communication hole 23 is formed at a position corresponding to the oil outlet pipe 52. Have been. The oil vertical passage L2 along the stacking direction is divided into an upper oil vertical passage L2A and a lower oil vertical passage L2B by the above-described closing portion 23C.

  In the lowermost lower core plate 15E, a pair of oil communication holes 23 are formed at two diagonal positions along the top bulging portion 18.

  The communication passage 43 defined inside the bulging portion 40 of the dance plate 13 includes an oil vertical passage L2 (lower oil vertical passage L2B) provided at a corner corresponding to the inlet passage port 51, It communicates with an oil outlet longitudinal passage L3 provided at the center. Further, the cooling water flows through the auxiliary passage 34 formed between the upper surface of the bottom wall 33 of the distance plate 13 and the lower surface of the lowermost lower core plate 15E, as in the first comparative example. It is configured as follows.

  The distance plate 13 has the same configuration as that of the first reference example, and the flange portion 42 at the tip of the bulging portion 40 is bent inwardly in a flange shape over the entire circumference. An opening 41 that opens largely in an oval shape is formed. In other words, at the tip of the bulging portion 40, a flange portion 42 substantially parallel to the bottom wall portion 33 is left around the entire periphery of the opening portion 41, and the upper surface of the flange portion 42 is the lowermost lower core. The lower surface of the plate 15E is closely and joined by brazing.

  The oil flow will be described. As shown by a solid arrow in FIG. 14, the oil flowing from the oil inlet pipe 51 enters the upper oil vertical passage L2A, flows downward through the upper oil vertical passage L2A, and Are guided to the oil passages 21 of each stage located in the upper half of the oil passage. The oil that has exchanged heat with the cooling water in the oil passages 21 of each stage flows out to the opposite oil vertical passage L1 and also flows downward in the oil vertical passage L1, and the oil of each stage located in the lower half of the core 11 Guided to passage 21. That is, it flows in the core 11 so as to make a U-turn from the upper half region to the lower half region. The oil further cooled in the oil passages 21 of the lower half stages flows out to the lower oil vertical passage L2B, flows downward in the lower oil vertical passage L2B, and communicates with the communication passage 43 provided in the distance plate 13. To the central oil outlet longitudinal passage L3. The oil flows upward in the oil outlet vertical passage L3, and flows out to the oil outlet pipe 52 via the top communication passage 19 (see FIG. 3) formed inside the top bulging portion 18 of the top plate 14.

  As described above, in the embodiment in which the oil passage ports (the oil inlet pipe 51 and the oil outlet pipe 52) serving as the oil inlet / outlet are provided on the top plate 14 side, the same operation and effect as those of the first reference example can be obtained. Can be. In other words, the lower oil longitudinal passage L2B and the oil outlet longitudinal passage L3, which are disposed apart from each other, are communicated with each other inside the bulging portion 40 bulging out from the distance plate 13 while reducing the thickness of the distance plate 13. The communication passage 43 can be formed. Further, similarly to the first reference example, since the auxiliary passage 34 functions as a cooling water passage, the heat exchange efficiency can be improved without increasing the size of the device.

  As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above embodiment, and various modifications are possible. For example, the oil inlet pipe 51 and the oil outlet pipe 52 may be reversed so that the oil flows in a direction opposite to the direction of the arrow shown in the figure. It is also possible to reverse the oil and the cooling water. Also in this case, the fin 16 is interposed in the oil passage.

  In the illustrated example, the oil passages 21 and the cooling water passages 22 are alternately defined by laminating the core plates 15 without providing a separate housing. It is also possible to adopt a configuration in which a core having only an oil passage is accommodated in a flowing housing.

  In the above embodiment, the cooling water passage port serving as the inlet / outlet of the cooling water is provided on the base plate 12, but a cooling water passage port may be provided on the top plate 14 side.

  Further, in the above embodiment, oil and cooling water are used as the first medium and the second medium. However, other mediums may be used. For example, in an air-cooled oil cooler, air is used instead of cooling water. .

DESCRIPTION OF SYMBOLS 11 ... Core part 12 ... Base plate 13, 13A ... Distance plate 15 ... Core plate 21 ... Oil passage 22 ... Cooling water passage 28, 28A ... Oil inlet passage port 29, 29A ... Oil outlet passage port 31 ... Cooling water inlet passage port 32 ... Cooling water outlet passage port 40, 40A ... Swelling part 41 ... Opening 42 ... Flange part 43, 43A ... Communication passage L1, L2 ... Oil vertical passage L3 ... Oil outlet vertical passage

Claims (3)

A large number of core plates are stacked, and a first medium passage through which the first medium flows and a second medium passage through which the second medium flows between adjacent core plates are alternately formed in the stacking direction. A core in which a plurality of vertical passages through which the first medium or the second medium flows are formed along a stacking direction;
A base plate,
Having a distance plate interposed between the base plate and the core,
The plurality of vertical passages are arranged apart from each other in a direction orthogonal to the stacking direction,
The distance plate swells in the stacking direction from the bottom wall portion so as to surround a thin bottom wall portion joined to the upper surface of the base plate and a communication path communicating the plurality of vertical passages. An elongated bulge,
The bulging portion has an opening formed between the plurality of vertical passages, leaving a flange portion at the tip over the entire circumference, and the flange portion is formed on the lower surface of the lowermost core plate of the core. The communication path is formed by a space that is joined and surrounded by the inner wall surface of the bulging portion, the upper surface of the base plate, and the lower surface of the lowermost core plate of the core.
A heat exchanger, characterized in that: An auxiliary passage through which the first medium or the second medium flows is formed between an upper surface of a bottom wall portion of the distance plate and a lower surface of the lowermost core plate,
The heat exchanger according to claim 1, wherein the auxiliary passage and the communication passage are separated by the bulging portion.   3. The distance plate according to claim 1, wherein a plurality of dimples projecting upward from an upper surface of the bottom wall portion and having a tip abutting on a lower surface of the lowermost core plate are formed. Heat exchanger.

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