JP6753994B2 - Heat exchanger - Google Patents

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 laminated, and an oil passage (first medium passage) through which oil (first medium) flows and cooling water (second medium) flow between adjacent core plates. Cooling water passages (second medium passages) are alternately formed in the stacking direction, and a core in which vertical passages through which oil or cooling water flows are formed along the stacking direction and a passage port connected to the vertical passages. It has a base plate that is formed with an opening and is thicker than the core plate, and a distance plate that is interposed between the base plate and the core. The distance plate has a plate shape that is thicker than the core plate, and a communication passage (bypass passage) that communicates the above-mentioned vertical passage and the passage port is formed through.

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 are arranged apart from each other in the direction orthogonal to the stacking direction (the direction along the surface of the distance plate). The above-mentioned communication passage is formed as an elongated slit-shaped hole in the direction along the surface of the distance plate. The same configuration is used when a plurality of vertical passages provided in the core are communicated with each other on the base plate side.

In order to suppress the pressure loss of 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 passage is increased, the rigidity of the distance plate is lowered, which in turn causes the rigidity of the heat exchanger to be lowered. Further, if the dimension (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 continuous passage, the height of the heat exchanger itself is increased, and not only the layout is deteriorated, but also the layout is deteriorated. This will increase 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 laminated, and a first medium passage through which the first medium passes between adjacent core plates and a second medium passage through which the second medium passes are provided. A core in which the first medium or a plurality of vertical passages through which the second medium passes are formed alternately in the stacking direction, a base plate, and between the base plate and the core. It has a distance plate, which is interposed in the media.

The plurality of vertical passages are arranged apart from each other (offset) in a direction orthogonal to the stacking direction. Then, the distance plate expands in the stacking direction from the bottom wall portion so as to surround the thin plate-shaped bottom wall portion joined to the upper surface of the base plate and the periphery of the communication passage communicating the plurality of vertical passages with each other. It has an elongated bulge that protrudes.

In this bulging portion, an opening is 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 core plate at the bottom of the core. The connecting passage is formed by a space surrounded by the inner wall surface of the bulging portion, the upper surface of the base plate, and the lower surface of the core plate at the bottom of the core.

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

In another preferred embodiment, the distance plate is formed with a plurality of dimples that protrude upward from the upper surface of the bottom wall portion and whose tip abuts on the lower surface of the lowermost core plate.

According to the present invention, the distance plate joined to the base plate is thinned to reduce the weight, and by providing a bulging portion on the bottom wall portion of the distance plate, vertical passages are provided inside the bulging portion. It is possible to provide a communication passage that communicates with each other. Since the bulging portion has an opening, the continuous 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.

The perspective view of the oil cooler which becomes the 1st reference example. Top view of the above oil cooler. FIG. 2 is a cross-sectional view taken along the line AA of FIG. An exploded perspective view of the above oil cooler. The perspective view of the distance plate of the 1st reference example above. Perspective view of the distance plate of the comparative example. The perspective view of the oil cooler which becomes the 2nd reference example. Top view of the oil cooler of the second reference example. FIG. 8 is a cross-sectional view taken along the line BB of FIG. FIG. 8 is a cross-sectional view taken along the line CC of FIG. An exploded perspective view of the oil cooler of the second reference example. The perspective view of the distance plate of the 2nd reference example above. Perspective view of the distance plate of the comparative example. An exploded perspective view of an oil cooler according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 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 "upper" and "lower" will be used with reference to the posture of FIG. 3 as necessary to facilitate understanding, and more specifically, from the base plate 12 to the core 11 along the stacking direction described later. Although the direction in which the oil cooler is directed is defined as the "upward" direction, the mounting posture is not limited to that shown in FIG.

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

As shown in FIG. 4, the core 11 is formed by stacking a large number of shallow plate-shaped core plates 15 having the same basic shape and forming a rectangular shape together with the fin plates 16 to form two adjacent core plates 15. Between, an oil passage 21 as a first medium passage through which oil as a first medium flows (see FIG. 3) and a cooling water passage 22 as a second medium passage through which cooling water as a second medium flows. (See FIG. 3) and are alternately formed in the stacking direction. The core plate 15 actually includes a plurality of types of core plates 15 having different details, and these are appropriately combined. Broadly speaking, it has a lower core plate 15A located below the oil passage 21 and an upper core plate 15B located above the oil passage 21, and a fin plate is provided between the two (that is, inside the oil passage 21). 16 is sandwiched between them and is sequentially laminated. The rectangular core plate 15 has peripheral flange portions 17 that rise in a tapered shape around its four sides, and these peripheral flange portions 17 are brazed in a state of being overlapped and laminated, whereby the oil passage 21 And the cooling water passage 22 are alternately defined. That is, the 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 superimposing and joining the peripheral flange portions 17 of the plurality of core plates 15. It has a structure.

In these core plates 15, circular oil communication holes 23 are formed at two points on one diagonal corner, and circular cooling water communication holes 23 are formed at two points on the other diagonal corner. 24 is formed as an opening, and a circular oil outlet hole 25 is further formed as an opening at the center position. These oil communication holes 23, cooling water communication holes 24, and 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. Then, the circular boss portions 23A, 24A, and 25A provided around the holes 23, 24, and 25 are joined to each other, so that the oil passage 21 and the cooling water passage 22 of each stage are sealed. As will be described later, the vertical passages L1 to L3, W1 and W2 arranged in the stacking direction are configured. The boss portions 23A, 24A, and 25A have different bulging directions between the lower core plate 15A and the upper core plate 15B.

Further, a large number of hemispherical or conical trapezoidal dimples 26 are formed on each core plate 15 so as to project toward the cooling water passage 22. As shown in FIG. 3, these dimples 26 are located in the cooling water passage 22, and the top of the dimple 26 of the lower core plate 15A and the top of the dimple 26 of the upper core plate 15B are in contact with each other. It is joined by brazing.

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

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

The uppermost core plate 15D located above the uppermost oil passage 21 is not provided with dimples 26 because it is in close contact with the top plate 14. Then, as the oil communication hole 23, only one oil communication hole 23D is formed as a simple hole that does not include the boss portion 23A. Further, since the lowermost core plate 15E located below the lowermost oil passage 21 is joined to the distance plate 13, the dimple 26 is not provided. Then, as the oil communication hole 23, only one oil communication hole 23E is formed as a simple hole that does not include the boss portion 23A.

The top plate 14 that is laminated on the top of the core 11 formed by stacking the plurality of core plates 15 described above is brazed to the upper surface of the uppermost upper core plate 15D, and the top bulge extends along the diagonal line. A top portion having a protruding portion 18 and communicating an oil communication hole 23D provided at a corner and an oil outlet hole 25 provided at the center between the top bulging portion 18 and the uppermost upper core plate 15D. A communication passage 19 (see FIG. 3) is formed.

The base plate 12 is provided with 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 is formed. An oil outlet passage port 29 is formed at a position corresponding to the communication hole 23. Further, the 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 the 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 attached to the control valve housing on the internal combustion engine / automatic transmission side via the mounting portion 27, and the oil inlet passage port 28 and the oil outlet passage port 29 are the oil passages on the internal combustion engine / automatic transmission side, respectively. The cooling water inlet passage port 31 and the cooling water outlet passage port 32 are connected to the cooling water passage side of the internal combustion engine / automatic transmission side, respectively.

Next, the distance plate 13 will be described with reference to FIG. FIG. 5 is a perspective view showing the distance plate 13 as a single unit. The distance plate 13 has a plate thickness that 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 peripheral flange portion 17 of the core plate 15 is around the four sides of the bottom wall portion 33. Similarly, it has a peripheral flange portion 17A that rises in a tapered shape. The peripheral flange portion 17A is overlapped with the peripheral flange portion 17 of the lowermost core plate 15E and then joined by brazing.

Similar to the core plate 15, a large number of hemispherical or conical trapezoidal dimples 26A protruding in the stacking direction are formed on the bottom wall portion 33, and the tip of the dimples 26A is the lowermost core plate 15E. It abuts on the lower surface side and is joined by brazing.

As shown in FIG. 3, an auxiliary passage 34, which is a space through which cooling water or oil flows, is liquid-tightly defined between the upper surface of the bottom wall portion 33 and the lower surface of the lowermost lower core plate 15E. ing. In this first embodiment, the cooling water is configured to flow through the auxiliary passage 34. Specifically, the cooling water inlet communication hole 35 and the 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. It is formed. The cooling water inlet communication hole 35 and the cooling water outlet communication hole 36 are formed as simple holes having no boss portion. 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 inside the auxiliary passage 34 and communicates with the cooling water outlet. It is designed to be 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. A circular boss portion 37A overhanging in the stacking direction is provided around the oil inlet communication hole 37. By joining the tip of the boss portion 37A to the lower surface around the oil communication hole 23E of the lowermost core plate 15E, the auxiliary passage 34 through which the cooling water flows and the oil communication hole 23E (that is, the lower part described later) It is liquidtightly separated from the side oil vertical passage L1A).

Here, the oil outlet hole 25 located at the center of the lowermost core plate 15E and the oil outlet passage port 29 located offset to the corner of the base plate 12 are arranged apart from each other in a direction orthogonal to the stacking direction. A bulging portion 40 that bulges from the bottom wall portion 33 in the stacking direction is formed over an elongated oval range along the diagonal line so as to communicate the two with each other. The flange portion 42 at the tip of the bulging portion 40 is bent inward in a flange shape over the entire circumference, and an opening 41 having a large oval 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 opening 41 over the entire circumference, and the upper surface of the flange portion 42 is the lowermost lower core. It is closely and joined to the lower surface of the plate 15E by brazing. More specifically, on one end side of the bulging portion 40 near the center, 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. On the other end side of the bulging portion 40 near the corner, the bottom wall portion 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 are formed as a communication passage 43 that communicates the two.

In a state where the above components are laminated and integrally brazed, as shown in FIGS. 3 and 4, several vertical passages L1 to L3, W1 continuous in the stacking direction are contained in the core 11. W2 is configured, and oil is guided from the oil inlet passage port 28 to the oil outlet passage port 29 through the oil passage 21 of each stage through these vertical passages L1 to L3, W1 and W2, and at the same time, the oil is guided to the oil outlet passage port 29. 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 a solid arrow, and the flow of cooling water is represented by a broken line arrow.

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 laminated. The oil vertical passage L2 composed of the above and the oil outlet vertical passage L3 formed by laminating the central oil outlet hole 25 are configured as an oil vertical passage extending in the core 11 in the stacking direction. 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 end of the lower oil vertical passage L1A opens toward the oil inlet passage port 28 and is linearly connected to the oil inlet passage port 28. The upper end of the upper oil vertical passage L1B is open toward the top continuous passage 19 formed by the top plate 14. These oil vertical passages L1A and L1B communicate with each oil passage 21 between the core plates 15A and 15B, respectively.

The upper end of the oil vertical passage L2 formed by the other oil communication hole 23 is sealed by the uppermost upper core plate 15D, and the lower end is 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 central oil outlet vertical passage L3 has an upper end open toward the top continuous passage 19 formed by the top plate 14, and an opening 41 (that is, an opening 41) formed in the bulge 40 of the distance plate 13. 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. Then, the lower end of the oil outlet vertical passage L3 and the oil outlet passage port 29 provided at the corner of the base plate 12 are communicated with each other by the communication passage 43.

Further, as shown by the broken line arrow in FIG. 4, by stacking the cooling water communication holes 24 of each core plate 15, a pair of cooling water vertical lines along the stacking direction are formed in the same manner as the oil vertical passages L1 and L2. The passages W1 and W2 are configured. On the other hand, the upper end of the cooling water inlet vertical passage W1 is sealed by the uppermost upper core plate 15D, and the lower end opens toward the cooling water inlet passage port 31 and is linear to the cooling water inlet passage port 31. It is connected to the. The upper end of the other cooling water outlet vertical passage W2 is sealed by the uppermost upper core plate 15D, and the lower end opens toward the cooling water outlet passage port 32 and is linear 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 in from the cooling water inlet passage port 31 flows upward through the cooling water inlet vertical passage W1 and is guided to the cooling water passage 22 at each stage of the core 11. The cooling water that has exchanged heat with oil when flowing in the cooling water passage 22 of each stage flows out to the cooling water outlet vertical passage W2 on the opposite side, and also flows downward through the cooling water outlet vertical passage W2, and flows downward to the cooling water outlet passage. It flows out to port 32.

Next, the flow of oil will be described. As shown by the solid arrows in FIGS. 3 and 4, the oil flowing in from the oil inlet passage port 28 flows upward through the lower oil vertical passage L1A and below the core 11. 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 passage 21 of each stage flows out to the oil vertical passage L2 on the opposite side, and also flows upward (that is, to the top side) through the oil vertical passage L2 to the upper half of the core 11. 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 each stage in the upper half flows out to the upper oil vertical passage L1B, flows upward through the upper oil vertical passage L1B, and flows vertically through the top continuous passage 19 to the central oil outlet. It is led to the passage L3. The oil flows downward in the oil outlet vertical passage L3 and flows out to the oil outlet passage port 29 through the communication passage 43 of the distance plate 13.

FIG. 6 shows the distance plate 13B of the comparative example. The distance plate 13B has a plate shape thicker than the distance plate 13 shown in FIG. 5, and the entire lower surface thereof is closely and joined to the upper surface of the base plate 12, and the entire upper surface thereof is the lowermost lower core plate 15E. It is designed to be closely and joined to the lower surface of the. In addition to the cooling water inlet communication hole 35, the cooling water outlet communication hole 36, and the oil inlet communication hole 37, the distance plate 13B is penetrated by a slit-shaped communication hole 45 as a configuration corresponding to the communication passage 43 of the present embodiment. It is formed.

The characteristic configuration of the above-mentioned reference example and its action and effect will be described while comparing with such a comparative example. First, in the reference example, the distance plate 13 is sufficiently thinned as compared with the comparative example, so that the weight can be reduced.

Further, a bulging portion 40 that bulges from the bottom wall portion 33 of the distance plate 13 in the stacking direction is provided, and the flange portion 42 at the tip thereof is joined to the lower surface of the lowermost lower core plate 15E that constitutes the lowermost surface of the core 11. By doing so, it is possible to form a communication passage 43 that communicates the oil outlet vertical passage L3 of the core 11 and the oil outlet passage port 29 of the base plate 12 arranged apart from each other inside the bulging portion 40. That is, the distance plate 13 can be provided with the communication passage 43 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 bulge. It is liquidtightly partitioned by the part 40. Therefore, the auxiliary passage 34 through which the cooling water flows functions as a cooling water passage that exchanges heat with the oil passage 21 at the lowermost stage of the adjacent core 11, and is compared with the case where the distance plate 13B of the above comparative example is used. Therefore, the amount of heat exchange can be increased in the same package.

Moreover, since the distance plate 13 is formed with a plurality of dimples 26A that project upward from the upper surface of the bottom wall portion 33 and have the tip joined to the lower surface of the lowermost lower core plate 15E, the distance is as described above. While thinning the plate 13, it is possible to sufficiently secure the rigidity of the distance plate 13 in the stacking direction.

Next, a second reference example of the present invention will be described with reference to FIGS. 7 to 12. In the following, only the points different from the first reference example will be mainly described, and duplicate explanations will be omitted as appropriate.

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

Specifically, as shown in FIG. 11, the oil inlet passage port 28A is formed as an opening near the center of the base plate 12, and is different from the 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 corner on the diagonal line. Further, 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 opposite sides on the diagonal line with respect to the first embodiment. ing.

As shown in FIG. 12, the distance plate 13A is configured to allow oil to flow through the auxiliary passage 34 formed inside, and in this relationship, the cooling water inlet communication arranged diagonally on one side. Around the hole 35 and the cooling water outlet communication hole 36, boss portions 35A and 36A to be joined to the lowermost core plate 15E are provided, respectively, 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 portion. Further, the bulging portion 40A formed on the distance plate 13A is bent in a substantially L shape so as to bypass the central oil outlet vertical passage L3, and the continuous passage 43A formed inside the bulging portion 40A. The oil inlet passage port 28A provided near the center of the base plate 12 and the lower oil vertical passage L1A provided at the corner of the core 11 communicate with each other.

Explaining the flow of oil, as shown by the solid line arrows in FIGS. 10 and 11, the oil flowing in from the oil inlet passage port 28A enters the lower oil vertical passage L1A through the communication passage 43A formed in the distance plate 13A. It enters, flows upward through the lower oil vertical passage L1A, and is guided to the oil passage 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 passage 21 of each stage flows out to the oil vertical passage L2 on the opposite side, and also flows upward (that is, to the top side) through the oil vertical passage L2 to the upper half of the core 11. It is guided to the oil passage 21 of each stage located. That is, as in the first embodiment described above, 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 each stage in the upper half flows out to the upper oil vertical passage L1B, flows upward through the upper oil vertical passage L1B, and flows vertically through the top continuous passage 19 to the central oil outlet. It is led to the passage L3. The 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.

Further, the distance plate 13A connects the oil outlet vertical passage L3 (lower end) 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. Dimples 26A are omitted in the vicinity of the range so that the upper surface of the flat bottom wall portion 33 extends.

FIG. 13 shows the distance plate 13C of the comparative example. The 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 and joined to the upper surface of the base plate 12, and the entire upper surface thereof is the maximum. The lower core plate 15E is closely joined to the lower surface of the lower 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 through the distance plate 13C as a configuration corresponding 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 through.

The configuration of the second reference example and its action and effect will be described while comparing with such a comparative example. First, as in the first reference example, in this second reference example, in addition to being able to reduce the weight by thinning the distance plate 13A as compared with the comparative example, the bulging portion 40A on the distance plate 13A By providing the above, it is possible to form a communication passage 43A that communicates the oil inlet passage port 28A of the base plate 12 and the lower oil vertical passage L1A of the core 11 that are arranged apart from each other.

Further, since the distance plate 13A is formed with a plurality of dimples 26A that project upward from the upper surface of the bottom wall portion 33 and have the tip joined to the lower surface of the lowermost core plate 15E, the distance plates 13A are laminated. Sufficient rigidity in the direction can be ensured.

In the comparative example shown in FIG. 13, since the two slit-shaped communication holes 46, 47 are formed in close proximity to each other, the communication holes 46, 47 are formed in order to secure the rigidity of the bridge portion 48 between the two slit-shaped communication holes 46, 47. The size of the plate is limited, and it is necessary to secure a certain dimension in the plate thickness direction. 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, and this auxiliary passage is formed. The 34 and the communication passage 43A are liquid-tightly partitioned by the bulging portion 40A. Then, the auxiliary passage 34 (and the oil outlet communication hole 38) is provided in the corners of the oil outlet vertical passage L3 and the base plate 12 provided near the center of the core 11 in addition to the communication passage 43A. It functions as a communication passage that communicates with the exit passage port 29A. Therefore, it is not necessary 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. Therefore, it is possible to secure a sufficient passage cross-sectional area and suppress the passage resistance. In addition, since the dimensions in the plate thickness direction are not restricted as in the comparative example, the size can be reduced by reducing the dimensions in the stacking direction.

As shown in FIG. 9, the oil inlet passage port 28A formed as an opening near the center of the base plate 12 and the oil outlet vertical passage L3 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 rises from the bottom wall portion 33 in the vicinity of the oil inlet passage port 28A, and the flange portion 42 at the tip is located around the oil outlet vertical passage L3. It is joined to the lower surface of the lower core plate 15E.

The broken line in FIG. 9 represents the cross-sectional shape when the thick plate-shaped distance plate 13C of the comparative example shown in FIG. 13 is used. In this case, the distance plate 13C closes a part of the oil inlet passage port 28A and the oil outlet vertical passage L3, the opening area thereof 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 peripheral edge portion of the oil inlet passage port 28A of the base plate 12 and the peripheral edge portion of the oil outlet vertical passage L3 of the core 11 are diagonally connected. , The oil inlet passage port 28A and the oil outlet vertical passage L3 are not partially blocked as in the comparative example, and a large opening area of these oil inlet passage port 28A and the oil outlet vertical passage L3 is secured to reduce the passage resistance. The increase can be suppressed.

FIG. 14 shows an embodiment of the present invention. In the following, only the points different from the first reference example and the second reference example will be described, and duplicate explanations will be omitted as appropriate. In this embodiment, the oil flow is different from that of the first reference example, 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 that serves as an inlet / outlet for oil. On the other hand, with respect to the top plate 14, a pair of oil passage ports (not shown) are formed at a pair of diagonal ends along the top bulging portion 18, and an oil inlet pipe 51 and oil serving as oil inlets and outlets are formed. The outlet pipe 52 and the outlet pipe 52 are erected respectively. The oil inlet pipe 51 is joined by brazing around an oil passage port (not shown) having an opening formed in a corner of the top plate 14, and the oil outlet pipe 52 is an end portion of the top bulging portion 18 near the outer periphery. It is joined by brazing around an oil passage port (not shown) having an opening formed on the upper surface side of the.

In the uppermost 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 23F is formed at a position corresponding to the oil outlet pipe 52. Is not provided (or a closed portion is provided).

In the lower core plate 15C of the intermediate stage, a closing portion 23C that closes the oil communication hole is provided at a position corresponding to the oil inlet pipe 51, and an oil communication hole 23 is formed at a position corresponding to the oil outlet pipe 52. Has been done. 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 closing portion 23C.

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

The continuous passage 43 defined inside the bulging portion 40 of the discharge 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 the oil outlet vertical passage L3 provided in the center. Further, cooling water flows through the auxiliary passage 34 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, 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 inward in a flange shape over the entire circumference, and inside the flange portion 42, An opening 41 having a large 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 opening 41 over the entire circumference, and the upper surface of the flange portion 42 is the lowermost lower core. It is closely and joined to the lower surface of the plate 15E by brazing.

Explaining the flow of oil, as shown by the solid arrow in FIG. 14, the oil flowing in from the oil inlet pipe 51 enters the upper oil vertical passage L2A, flows downward through the upper oil vertical passage L2A, and the core 11 It is guided to the oil passage 21 of each stage located in the upper half. The oil that has exchanged heat with the cooling water in the oil passage 21 of each stage flows out to the oil vertical passage L1 on the opposite side, flows downward through the oil vertical passage L1, and is the oil of each stage located in the lower half of the core 11. You will be guided to the 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 each stage in the lower half flows out to the lower oil vertical passage L2B and flows downward through the lower oil vertical passage L2B, and the communication passage 43 provided in the distance plate 13 is provided. It is led to the central oil outlet vertical passage L3 via. The oil flows upward in the oil outlet vertical passage L3, and flows out to the oil outlet pipe 52 via the top continuous passage 19 (see FIG. 3) formed inside the top bulging portion 18 of the top plate 14.

As described above, even in the embodiment in which the oil passage port (oil inlet pipe 51 and oil outlet pipe 52) serving as the oil inlet / outlet is provided on the top plate 14 side, the same effect as that of the first reference example can be obtained. Can be done. That is, while trying to reduce the wall thickness of the distance plate 13, the lower oil vertical passage L2B and the oil outlet vertical passage L3 arranged apart from each other are communicated with each other inside the bulging portion 40 formed in the distance plate 13. The communication passage 43 can be formed. Further, as in the first reference example, since the auxiliary passage 34 functions as a cooling water passage, the heat exchange efficiency can be improved without inviting an increase in size of the apparatus.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, it is also possible to reverse the oil inlet pipe 51 and the oil outlet pipe 52 so that the oil flows in the direction opposite to the direction of the arrow shown in the figure. It is also possible to reverse the oil and the cooling water. In this case as well, the fins 16 are interposed in the oil passage.

Further, in the illustrated example, the oil passage 21 and the cooling water passage 22 are alternately defined by laminating the core plates 15 without providing a separate housing, which is a so-called housingless configuration. It is also possible to have a configuration in which a core portion having only an oil passage is housed in a flowing housing.

In the above embodiment, the base plate 12 is provided with a cooling water passage port that serves as an inlet / outlet for cooling water, 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, but other media may be used. For example, in an air-cooled oil cooler, air is used instead of the cooling water. ..

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 ... Continuous passage L1, L2 ... Oil vertical passage L3 ... Oil outlet vertical passage

Claims (3)

A large number of core plates are laminated, and a first medium passage through which the first medium flows and a second medium passage through which the second medium flows are alternately formed in the stacking direction between adjacent core plates. A core in which a plurality of vertical passages through which the first medium or the second medium passes is formed along the stacking direction.
With the base plate
It has 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 bulges in the stacking direction from the bottom wall portion so as to surround the thin plate-shaped bottom wall portion joined to the upper surface of the base plate and the communication passages communicating with the plurality of vertical passages. It has an elongated bulge and
In this bulging portion, an opening is 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 core plate at the bottom of the core. The continuous passage is formed by a space surrounded by the inner wall surface of the bulging portion, the upper surface of the base plate, and the lower surface of the core plate at the bottom of the core.
A heat exchanger characterized by the above. An auxiliary passage through which the first medium or the second medium passes is formed between the upper surface of the bottom wall portion of the distance plate and the lower surface of the lowermost core plate.
The heat exchanger according to claim 1, wherein the auxiliary passage and the continuous passage are separated by the bulging portion. The first or second claim, wherein the distance plate is formed with a plurality of dimples that protrude upward from the upper surface of the bottom wall portion and have a tip that abuts on the lower surface of the lowermost core plate. Heat exchanger.

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