JP2023068901A - Heat exchanger - Google Patents

Abstract

To improve performance of a heat exchanger.SOLUTION: An oil cooler 1 comprises a heat exchange unit 2 in which a plurality of core plates 5 and 6 having a pair of through holes 11, 12 are laminated. The heat exchange unit 2 constitutes an inter-plate flow path through which fluid flows between each of the plurality of core plates. The heat exchange unit 2 comprises a pair of communication flow paths formed by the pair of through holes and communicating the plurality of inter-plate flow paths in a lamination direction of the plurality of core plates, a fluid introduction unit 14 that forms a flow path that communicates with one of the pair of communication flow paths, and a fluid discharge unit 17 that forms a flow path that communicates with the other of the pair of communication flow paths. A center C2 of the fluid introduction unit is separated from a center C1 of one of the pair of communication flow paths by a predetermined distance D1.SELECTED DRAWING: Figure 3

Description

The present invention relates to heat exchangers.

A heat exchanger that exchanges heat between a plurality of fluids is used as a water-cooled oil cooler that cools lubricating oil of an internal combustion engine using a refrigerant such as long-life coolant (LLC). In addition, the heat exchanger has a narrowed portion that partially reduces the cross-sectional area in the direction orthogonal to the plate stacking direction of the first refrigerant tank space that distributes the refrigerant flowing in from the refrigerant inflow portion to the plurality of refrigerant flow paths. is known (see Patent Document 1, for example).

Japanese Patent Application Laid-Open No. 2019-200039

In order to improve the performance of heat exchangers, that is, to improve the efficiency of heat exchange, there is room for further improvement in terms of evenly distributing fluids such as refrigerant and lubricating oil flowing in through multiple flow paths in the stacking direction. rice field.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to improve the performance of a heat exchanger by uniformly distributing a fluid through a plurality of flow paths in the stacking direction.

In order to solve the above problems, a heat exchanger according to the present invention is a heat exchanger in which a plurality of core plates having a pair of through holes are stacked to form an inter-plate flow path between which a fluid flows, A pair of communication channels formed by the pair of through holes and communicating the plurality of inter-plate channels in the stacking direction of the plurality of core plates, and a channel communicating with one of the pair of communication channels are formed. and a fluid discharge part forming a flow path communicating with the other of the pair of communication flow paths, wherein the center of the fluid introduction part is at a predetermined distance from the center of one of the pair of communication flow paths. distance away.

In the heat exchanger according to the present invention, a part of the fluid introduction part faces the core plate.

In the heat exchanger according to the present invention, the center of the fluid introduction portion is located at one of the pair of communication passages in the direction of a straight line connecting one and the other of the pair of communication passages in the plurality of core plates. away from the center.

In the heat exchanger according to the present invention, the center of the fluid introduction part is separated from the center of one of the pair of communication passages in the direction of the outer periphery of the plurality of core plates in the surface direction of the plurality of core plates. ing.

The heat exchanger according to the present invention includes a base plate on one end side of the plurality of core plates in the stacking direction, and the fluid introduction section is an opening formed in the base plate.

The fluid introduction part is provided at a position where the center of the opening on the inflow side of the base plate and the center of the opening on the outflow side of the base plate are separated in the plane direction.

According to the present invention, the performance of the heat exchanger can be improved by uniformly distributing the fluid through a plurality of flow paths in the stacking direction.

1 is a plan view of an oil cooler as a heat exchanger according to the first embodiment; FIG. 1 is a side view of an oil cooler according to a first embodiment; FIG. FIG. 2 is a cross-sectional view taken along line AA of the oil cooler according to the first embodiment; FIG. 2 is a BB cross-sectional view of the oil cooler according to the first embodiment; 3 is a plan view showing a first core plate and a second core plate of the oil cooler according to the first embodiment; FIG. 4 is a cross-sectional view of an oil cooler according to Reference Example 1. FIG. FIG. 4 is a schematic diagram showing results of flow analysis of cooling water in the oil cooler according to the first embodiment; FIG. 10 is a schematic diagram showing results of flow analysis of cooling water in an oil cooler according to Reference Example 1; FIG. 10 is a schematic diagram showing a result of flow analysis of cooling water in an oil cooler according to Reference Example 2; FIG. 11 is a schematic diagram showing a result of flow analysis of cooling water in an oil cooler according to Reference Example 3; FIG. 11 is a schematic diagram showing a result of flow analysis of cooling water in an oil cooler according to Reference Example 4; FIG. 5 is a cross-sectional view of an oil cooler according to a second embodiment; FIG. 9 is a schematic diagram showing results of flow analysis of cooling water in an oil cooler according to the second embodiment; FIG. 11 is a schematic diagram showing a result of flow analysis of cooling water in an oil cooler according to Reference Example 5; FIG. 11 is a schematic diagram showing the results of flow analysis of cooling water in an oil cooler according to Reference Example 6; FIG. 11 is a graph showing the distribution ratio of each stage of the inter-plate cooling water flow path of the oil cooler according to the second embodiment and reference examples 5 and 6. FIG. FIG. 7 is a cross-sectional view of an oil cooler according to a third embodiment; FIG. 11 is a cross-sectional view of an oil cooler according to a fourth embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the heat exchanger according to the present invention uses a refrigerant (cooling water) such as long-life coolant (LLC), which corresponds to the second fluid, to lubricate the internal combustion engine, which corresponds to the first fluid ( An example of use as a water-cooled oil cooler 1 for cooling oil) will be described.

[First embodiment]
FIG. 1 is a plan view of an oil cooler 1 as a heat exchanger according to the first embodiment. FIG. 2 is a side view of the oil cooler 1. FIG. FIG. 3 is a cross-sectional view of the oil cooler 1 taken along line AA. FIG. 4 is a BB cross-sectional view of the oil cooler 1. As shown in FIG.

First, a first embodiment of the heat exchanger of the present invention will be described. As shown in FIGS. 1 to 4, the oil cooler 1 includes a plurality of core plates (first core plate 5, second core plate 6) having a pair of through holes (oil passage hole 11, cooling water passage hole 12). (see FIG. 5) is provided. The heat exchange unit 2 includes inter-plate flow paths (inter-plate oil flow paths 7 and inter-plate cooling water flow paths 8) through which fluids (lubricating oil and cooling water) flow between each of the plurality of core plates. Configure. The heat exchange section 2 is formed of a pair of through holes, and includes a pair of communication passages (a pair of oil communication passages 31 and a pair of cooling water communication passages 31) that communicate the plurality of inter-plate passages in the stacking direction of the plurality of core plates. flow path 32), a fluid introduction portion (cooling water introduction portion 14 and oil introduction portion 18) forming a flow path communicating with one of the pair of communication flow paths, and a flow path communicating with the other of the pair of communication flow paths. and a fluid discharge portion (a cooling water discharge portion 15 and an oil discharge portion 19) forming a The center C2 of the fluid introduction portion is separated from the center C1 of one of the pair of communication channels by a predetermined distance D1. The oil cooler 1 according to this embodiment will be specifically described below.

Hereinafter, for convenience of explanation, among the directions along the surfaces of the first core plate 5, the second core plate 6, the top plate 3, and the bottom plate (base plate) 4 in the oil cooler 1 shown in FIGS. One direction along the X axis (horizontal direction) is defined as the X direction, and the other direction along the Y axis (forward and backward direction) is defined as the Y direction. Also, the direction along the Z-axis direction (Z direction) perpendicular to the X-axis and the Y-axis in the oil cooler 1 is the vertical direction or the first core plate 5, the second core plate 6, the top plate 3, and the bottom plate 4 The stacking direction of A direction along the surfaces of the first core plate 5, the second core plate 6, the top plate 3, and the bottom plate 4 in the oil cooler 1 (a plane extending in the X-axis and Y-axis directions) is called a surface direction. The planar direction is a direction perpendicular to the stacking direction. Furthermore, in the oil cooler 1, the one end side in the stacking direction is the bottom plate 4 side (lower end side), and the other end side in the stacking direction is the top plate 3 side (upper end side). In the following description, when the positional relationship and direction of each component are described as right, left, front, rear, top, bottom, top, bottom, etc., the positional relationship and direction in the drawings are shown, not the actual ones. The positional relationship and direction in the heat exchanger are not limited.

An outline of an oil cooler 1 as a heat exchanger according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

As shown in FIG. 1, the oil cooler 1 includes a heat exchange section 2 that exchanges heat between oil and cooling water, a top plate 3 attached to the upper surface of the heat exchange section 2, and a lower surface of the heat exchange section 2. and a bottom plate 4 formed by

In the heat exchange section 2, first core plates 5 as a plurality of core plates having a common basic shape and second core plates 6 as a plurality of core plates are alternately stacked. In addition, the heat exchanging portion 2 is provided between the first core plate 5 and the second core plate 6 with an inter-plate oil channel 7 (see FIGS. 3 and 4) as a first inter-plate channel and a second inter-plate channel. Inter-plate cooling water flow paths 8 (see FIGS. 3 and 4) are alternately formed as inter-plate flow paths. In the oil cooler 1 , for example, 10 inter-plate oil passages 7 and 9 inter-plate cooling water passages 8 are formed in the heat exchange portion 2 .

In FIG. 3, the straight line connecting one side (cooling water inlet side) and the other (cooling water outlet side) of the pair of cooling water communication passages 32 in the heat exchange section 2 is taken as line AA shown in FIG. It is a sectional view. FIG. 4 is a cross-sectional view taken along line BB shown in FIG. be. As shown in FIGS. 3 and 4 , the oil cooler 1 has an inter-plate oil flow path 7 between the upper surface of the first core plate 5 and the lower surface of the second core plate 6 . In the oil cooler 1 , an inter-plate cooling water flow path 8 is formed between the lower surface of the first core plate 5 and the upper surface of the second core plate 6 . A fin plate (schematically shown in FIGS. 3 and 4) is arranged in each inter-plate oil channel 7, and a plurality of embossments 20 (FIGS. 3 and 4) are arranged in the inter-plate cooling water channel 8. 4) protrudes.

The plurality of first and second core plates 5, 6, top plate 3 and bottom plate 4 are joined together by brazing. Each material of the plurality of first core plates 5, second core plates 6, top plate 3, and bottom plate 4 is formed using a so-called clad material in which the surface of an aluminum alloy base material is coated with a brazing material layer. It is The above materials are brazed together by heating in a furnace after temporarily assembling each part at a predetermined position.

Note that the first core plates 5 positioned at the top and bottom of the heat exchange section 2 are generally positioned in the middle of the heat exchange section 2 because of their relationship with the top plate 3 and the bottom plate 4. It has a slightly different configuration than plate 5 .

For example, the first core plate 5 positioned at the bottom of the heat exchange section 2 is formed thicker than the other first core plates 5 .

FIG. 5 is a plan view showing the first core plate 5 and the second core plate 6 of the oil cooler 1. FIG. As shown in FIG. 5, the first core plate 5 and the second core plate 6 are formed by press-molding a thin aluminum alloy base material, and are generally rectangular (substantially square) with a pair of through holes. , a pair of oil passage holes 11 , 11 and a pair of cooling water passage holes 12 , 12 . In FIG. 5 , line CC indicated by a dashed line is a straight line that connects one (oil introduction side) and the other (oil discharge side) of the pair of oil communication passages 31 in the heat exchange section 2 .

Moreover, as shown in FIG. 5, the first core plate 5 and the second core plate 6 have holes 13 through which neither oil nor cooling water can pass. As shown in FIGS. 3 and 4 , the hole portions 13 communicate with each other in the upper and lower portions of the heat exchanging portion 2 , but do not communicate with the inter-plate oil passages 7 and the inter-plate cooling water passages 8 . Further, the first core plate 5 and the second core plate 6 are formed with a plurality of embossments 20 around the pair of oil passage holes 11, 11, the pair of cooling water passage holes 12, 12, and the hole portion 13. ing. The embossing 20 is, for example, an uneven shape that is circular in plan view.

As shown in FIG. 3 , the top plate 3 has a cooling water discharge portion 15 that communicates with one of the cooling water passage holes 12 at the top of the heat exchanging portion 2 . A cooling water discharge pipe 17 is connected to the cooling water discharge portion 15 as shown in FIGS.

As shown in FIG. 3 , the bottom plate 4 as a base plate has a cooling water introduction portion 14 that communicates with one of the cooling water passage holes 12 at the bottom of the heat exchange portion 2 . A cooling water introduction passage (not shown) is connected to the cooling water introduction portion 14 . Further, as shown in FIG. 4, the bottom plate 4 has an oil introduction portion 18 communicating with one of the oil passage holes 11 at the bottom of the heat exchange section 2 and the other oil passage hole 11 at the bottom of the heat exchange section 2. and an oil discharge portion 19 that communicates with the oil discharge portion 19 . The oil introduction portion 18 and the oil discharge portion 19 of the bottom plate 4 are attached to a cylinder block or the like (not shown) via gaskets or the like (not shown) that seal each of them.

The oil cooler 1 is supplied with cooling water from the cooling water introduction portion 14 and discharged from the cooling water discharge pipe 17 . The oil cooler 1 is supplied with oil from an oil introduction portion 18 and discharged from an oil discharge portion 19 .

A pair of oil passage holes 11 , 11 are located at the outer edges of the first core plate 5 and the second core plate 6 . The pair of oil passage holes 11, 11 are formed at symmetrical positions with the centers of the first core plate 5 and the second core plate 6 interposed therebetween. More specifically, as shown in FIG. 5, the pair of oil passage holes 11, 11 are the outer edges of the first core plate 5 and the second core plate 6, and are located on the diagonal lines of the first core plate 5 and the second core plate 6. They are formed at symmetrical positions with the centers of the first core plate 5 and the second core plate 6 interposed therebetween. The pair of oil passage holes 11, 11 are formed so that their positions match in the stacking direction when the plurality of first core plates 5 and second core plates 6 are stacked.

A pair of cooling water passage holes 12 , 12 are located at the outer edges of the first core plate 5 and the second core plate 6 . A pair of cooling water passage holes 12 , 12 are formed at symmetrical positions with the centers of the first core plate 5 and the second core plate 6 interposed therebetween. More specifically, the pair of cooling water passage holes 12, 12 are the outer edges of the first core plate 5 and the second core plate 6, as shown in FIG. They are formed at symmetrical positions with respect to the center of the first core plate 5 and the second core plate 6 on the diagonal line. The pair of cooling water passage holes 12, 12 are formed so that their positions match in the stacking direction when the plurality of first core plates 5 and second core plates 6 are stacked.

The coolant passage holes 12 are formed in the first core plate 5 and the second core plate 6 so as not to overlap the oil passage holes 11 . Specifically, the cooling water passage holes 12 are formed on diagonal lines of the first core plate 5 and the second core plate 6 that are different from the oil passage holes 11 .

The hole 13 is positioned at the center of the first core plate 5 and the second core plate 6, as shown in FIG.

The cooling water introduced from the cooling water introduction portion 14 of the bottom plate 4 flows through the inter-plate cooling water flow path 8, and flows through the heat exchange portion 2 as a whole in the stacking direction of the first core plate 5 and the second core plate 6. , and reaches the cooling water discharge portion 15 of the top plate 3 . The oil introduced from the oil introduction portion of the bottom plate 4 flows through the inter-plate oil flow path 7, and the inside of the heat exchange portion 2 as a whole is perpendicular to the stacking direction of the first core plate 5 and the second core plate 6. direction to reach the oil drain on the bottom plate 4 .

As shown in FIG. 4 , the first core plate 5 is formed so that the periphery of the oil passage hole 11 protrudes toward the bottom plate 4 side (downward) as a boss portion 21 . Further, the first core plate 5 is formed one step higher so that the periphery of the cooling water passage hole 12 protrudes toward the top plate 3 side (upper side) as a boss portion 22 . 3 and 4, the first core plate 5 is arranged such that the periphery of the hole 13 protrudes toward the top plate 3 (upper side) and the bottom plate 4 (lower side) as bosses 23, respectively. is formed in In addition, in the lowermost first core plate 5 , the boss portion 23 around the hole portion 13 protrudes only toward the top plate 3 side.

As shown in FIG. 4 , the second core plate 6 is formed one step higher so that the periphery of the oil passage hole 11 protrudes toward the top plate 3 side (upper side) as a boss portion 24 . Further, the second core plate 6 is formed so that the periphery of the cooling water passage hole 12 protrudes toward the bottom plate 4 side (lower side) as a boss portion 25 . 3 and 4, the second core plate 6 is arranged so that the periphery of the hole 13 protrudes toward the top plate 3 (upper side) and the bottom plate 4 (lower side) as bosses 26, respectively. is formed in

Therefore, by alternately combining the first core plates 5 and the second core plates 6, the inter-plate oil passages 7 and the inter-plate cooling water passages 8 are provided between the first core plates 5 and the second core plates 6. A constant interval is formed.

The boss portion 21 provided around the oil passage hole 11 in the first core plate 5 is joined to the boss portion 24 provided around the oil passage hole 11 of the adjacent one of the second core plates 6. there is As a result, two adjacent upper and lower inter-plate oil passages 7 communicate with each other. Further, the two adjacent upper and lower inter-plate oil passages 7 are isolated from the inter-plate cooling water passage 8 therebetween. Therefore, when the plurality of first core plates 5 and the second core plates 6 are joined together, the inter-plate oil passages 7 communicate with each other through the plurality of oil passage holes 11 . Thus, the plurality of oil passage holes 11 form a pair of oil communication passages 31 that communicate the plurality of inter-plate oil passages 7 in the stacking direction of the plurality of first core plates 5 and second core plates 6. . The pair of oil communication channels 31 communicate with the inter-plate oil channel 7 as the first inter-plate channel.

The boss portion 25 provided around the cooling water passage hole 12 in the second core plate 6 is joined to the boss portion 22 provided around the cooling water passage hole 12 of the adjacent first core plate 5. It is As a result, two adjacent upper and lower inter-plate cooling water flow paths 8 communicate with each other. Further, two adjacent upper and lower inter-plate cooling water flow paths 8 are isolated from the inter-plate oil flow path 7 therebetween. Therefore, when the plurality of first core plates 5 and the second core plates 6 are joined together, the inter-plate cooling water passages 8 communicate with each other through the plurality of cooling water passage holes 12 . Thus, the plurality of cooling water passage holes 12 form a pair of cooling water communication passages 32 that communicate the plurality of inter-plate cooling water passages 8 in the stacking direction of the plurality of first core plates 5 and second core plates 6 . Form. The pair of cooling water communication channels 32 communicate with the inter-plate cooling water channel 8 as the second inter-plate channel.

The bosses 23 around the holes 13 in the first core plate 5 are joined to the bosses 26 provided around the holes 13 in the adjacent upper and lower second core plates 6 . Therefore, in a state in which many first core plates 5 and second core plates 6 are joined, the holes 13 do not communicate with the inter-plate oil passages 7 and the inter-plate cooling water passages 8 .

The pair of cooling water passage holes 12, 12 are formed so that their positions match in the stacking direction when the plurality of first core plates 5 and second core plates 6 are stacked. Therefore, the center positions of the cooling water communication passages 32 in the surface direction of the first core plate 5 and the second core plate 6 are aligned in the stacking direction as indicated by the dashed-dotted line C1 in FIG.

The cooling water introduction part 14 is a through hole-shaped opening formed in the bottom plate 4 . The cooling water introduction portion 14 communicates with one of the cooling water passage holes 12 at the bottom of the heat exchanging portion 2 . In the cooling water introduction part 14, the center position of the bottom plate 4 in the plane direction is separated from the center C1 of the cooling water communication channel 32 in the plane direction by a predetermined distance D1, as indicated by the dashed line C2 in FIG. (offset). The predetermined distance D1 is determined by the overall dimensions of the oil cooler 1, the dimensions of the cooling water introduction portion 14, the cooling water communication passage 32, and the like. For example, when the diameter of the cooling water communication channel 32 is 12 mm, the distance D1 is 5.5 mm. The center C2 of the cooling water introduction part 14 is located in the direction of the straight line connecting the cooling water introduction side and the cooling water discharge side of the pair of cooling water communication passages 32 in the heat exchange part 2 shown in FIG. It is separated from the center C1 of the cooling water communication channel 32 on the side. In addition, the center C2 of the cooling water introduction portion 14 is located in the direction of the outer peripheral edge of the first core plate 5 and the second core plate 6 (the outer peripheral side) in the surface direction of the first core plate 5 and the second core plate 6. direction) away from the center C1 of the cooling water communication passage 32 on the cooling water introduction side.

In the bottom plate 4, the cooling water introduction part 14 is provided at the position as described above, so that a part of the penetrating hole of the cooling water introduction part 14 is located in the lowest core plate among the plurality of core plates, specifically, in FIG. faces the lower surface of the first core plate 5 as shown in FIG. Therefore, in the oil cooler 1, the flow path at the connecting portion between the cooling water introduction portion 14 and the cooling water communication flow path 32 has a crank-like or substantially crank-like bent shape as indicated by the arrow F1.

Next, the operation of the oil cooler 1 described above will be described in comparison with the oil cooler 100 of Reference Example 1. FIG.

FIG. 6 is a sectional view corresponding to AA in FIG. 1 of the oil cooler 100 according to Reference Example 1. As shown in FIG. The oil cooler 100 of Reference Example 1 is different only in that the position of the center of the cooling water introduction portion 114 in the plane direction of the bottom plate 104 coincides with the position of the center C1 of the cooling water communication passage 32 in the plane direction. . Since the oil cooler 100 has other configurations similar to those of the oil cooler 1 previously described, the description of the other configurations is omitted.

FIG. 7 is a schematic diagram showing the result of the flow analysis of the cooling water of the oil cooler 1 according to the first embodiment along the AA cross section. FIG. 8 is a schematic diagram showing the results of flow analysis of the cooling water of the oil cooler 100 according to Reference Example 1 in a section corresponding to AA. The flow velocity of the cooling water is as indicated by flow scales S1 and S2 in FIGS. 7 and 8. FIG.

In FIGS. 7 and 8, distribution ratios are obtained as follows. First, at each stage of the plurality of inter-plate cooling water flow paths 8 of the heat exchange section 2, a cross section at a position indicated by line CC in FIG. 5 is set as an evaluation cross section. Next, the flow rate passing through the evaluation cross section at each stage of the plurality of inter-plate cooling water flow paths 8 is calculated from the flow velocity. Then, the distribution ratio is obtained from the ratio of the flow rate at each stage of the plurality of inter-plate cooling water flow paths 8 to the flow rate of the entire evaluation cross section of the plurality of inter-plate cooling water flow paths 8 .

As shown in FIGS. 7 and 8, in the oil cooler 1, compared to the oil cooler 100, the cooling water introduced from the cooling water introduction portion 14 to the heat exchange portion 2 is Not only the inter-plate cooling water flow path 8 on the distant top plate 3 side (uppermost side), but also the inter-plate cooling water flow path 8 of the bottom plate 4 (lowermost side) on the side closer to the cooling water introduction part 14 in the stacking direction. It can be seen that it is also distributed in Moreover, the lowest distribution ratio of the plurality of inter-plate cooling water passages 8 of the oil cooler 1 shown in FIG. It has a higher value than

In the oil cooler 1, the center C2 of the cooling water introduction portion 14 in the planar direction is separated from the center C1 of the cooling water communication channel 32 in the planar direction by a distance D1. It is introduced into the heat exchange section 2 as a flow oblique to the stacking direction (Z direction), which is the stretching direction. More specifically, the center C2 of the cooling water introduction portion 14 is directed toward the outer peripheral ends of the first core plate 5 and the second core plate 6 (outward direction), and the cooling water on the cooling water introduction side. It is away from the center C<b>1 of the communication channel 32 . Therefore, the cooling water is introduced from the outside of the inter-plate cooling water channel 8 formed by the first core plate 5 and the second core plate 6 toward the inside (the center side of the inter-plate cooling water channel 8). be. Therefore, as shown in FIG. 7, the oil cooler 1 can increase the distribution ratio of the plurality of inter-plate cooling water flow paths 8 on the lower side compared to the oil cooler 100 of the first reference example.

Next, a case where the diameters of the cooling water introduction portions 214, 314, 414 in the oil cooler 1 are changed as in Reference Examples 2 to 4 described below will be described.

9A and 9B are schematic diagrams showing results of flow analysis of the cooling water of the oil cooler 200 according to Reference Example 2. FIG. 10A and 10B are schematic diagrams showing the result of flow analysis of the cooling water of the oil cooler 300 according to Reference Example 3. FIG. 11A and 11B are schematic diagrams showing the result of flow analysis of the cooling water of the oil cooler 400 according to Reference Example 4. FIG. Similar to the results of the flow analysis in FIGS. 7 and 8, in the results of the flow analysis shown in FIGS. 9 to 11, the darker the gray color and the closer it is to black, the faster the flow rate of the cooling water, and the lighter the gray color becomes to white. It shows that the flow velocity of the cooling water becomes slower as it approaches.

Oil coolers 200, 300, and 400 of reference examples 2 to 4 shown in FIGS. coincides with the position of the center C1 of the cooling water communication channel 32 in the plane direction. Oil coolers 200, 300, and 400 of Reference Examples 2 to 4 differ from oil cooler 100 of Reference Example 1 in the diameters of cooling water introduction portions 214, 314, and 414, respectively. Specifically, the oil cooler 200 is a reference example for verifying the effect of increasing the flow velocity by reducing the diameter of the cooling water introduction portion 214 by 3.4 mm. The oil cooler 300 is a reference example for verifying the effect of increasing the flow velocity by reducing the diameter of the cooling water introduction portion 314 by 5.0 mm. The oil cooler 400 is a reference example for verifying the effect of increasing the flow velocity by reducing the diameter of the cooling water introduction portion 414 by 6.7 mm. In addition, in the oil coolers 200, 300, and 400 of Reference Examples 2 to 4, the diameter of the cooling water communication passage 32 is, for example, 12 mm.

As shown in FIGS. 9 to 11, the oil coolers 300 and 400 in which the diameters of the cooling water introduction portions 314 and 414 are narrowed to a small size are different from the oil cooler 200 in that the cooling water introduced into the heat exchange portion 2 is The coolant flows backward toward the cooling water introduction portions 314 and 414 . That is, according to the oil coolers 200, 300, 400 of Reference Examples 2 to 4, even if the diameters of the cooling water introduction portions 214, 314, 414 are narrowed down, the heat is exchanged like the oil cooler 1 according to the first embodiment. It can be seen that it is difficult to improve the performance of the oil cooler 1 by increasing the flow velocity and distribution ratio of the cooling water in each stage of the part 2 .

As described above, according to the oil cooler 1 , the performance of the oil cooler 1 can be improved by increasing the flow velocity and distribution ratio of the cooling water in each stage of the heat exchange section 2 .

[Second embodiment]
Next, an oil cooler 1B according to a second embodiment of the heat exchanger of the present invention will be described. In addition, in the oil cooler 1B according to the present embodiment, the same components as those of the oil cooler 1 described above are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 12 is a cross-sectional view of an oil cooler 1B according to the second embodiment. The oil cooler 1B shown in FIG. 12 is provided with the cooling water discharge portion 15 on the lower side. In terms of direction, it is away from the center C1 of the cooling water communication passage 32 on the cooling water introduction side toward the center of the first core plate 5 and the second core plate 6 (inward direction). In the heat exchanger of the present invention, the direction in which the center of the cooling water introduction part deviates from the cooling water communication channel is the outside of the inter-plate cooling water channel 8 in the oil cooler 1 described above. There is also a case near the center of the inter-plate cooling water flow path 8 as in 1B.
By shifting the center C2B of the cooling water introduction portion 14B in this way, in the oil cooler 1B, the flow of the fluid (cooling water) is deflected in the vicinity of the cooling water introduction portion 14B, and the fluid is difficult to flow between the plates in the stacking direction. Fluid flow to the cooling water flow path 8 can be improved.

FIG. 13 is a schematic diagram showing the result of flow analysis of the cooling water of the oil cooler 1B according to the second embodiment. 14A and 14B are schematic diagrams showing results of flow analysis of the cooling water of the oil cooler 500 according to Reference Example 5. FIG. 15A and 15B are schematic diagrams showing the result of flow analysis of the cooling water of the oil cooler 600 according to Reference Example 6. FIG. FIG. 16 is a graph showing the distribution ratio of each stage of the inter-plate cooling water flow path of the oil coolers according to the second embodiment and reference examples 5 and 6. FIG.

The oil cooler 500 according to Reference Example 5 is different only in that the position of the center of the cooling water introduction portion 514 in the plane direction of the bottom plate coincides with the position of the center C1 of the cooling water communication channel 32 in the plane direction. . In the oil cooler 600 according to Reference Example 6, similarly to the oil cooler 500, the position of the center of the cooling water introduction portion 514 in the plane direction of the bottom plate coincides with the position of the center C1 of the cooling water communication passage 32 in the plane direction. However, the difference is that the diameter of the cooling water introduction portion 614 is made smaller than that of the cooling water introduction portions 14B and 514 .

As shown in FIGS. 13 and 16, in the oil cooler 1B, compared to the oil coolers 500 and 600, the cooling water introduced from the cooling water introduction portion 14 to the heat exchange portion 2 is stacked from the cooling water introduction portion 14. It can be seen that the inter-plate cooling water flow path 8 on the side of the top plate 3 (uppermost stage side), which is separated in the direction, is also distributed.

With the oil cooler 1B, similarly to the previously described oil cooler 1, it is possible to improve the performance by increasing the flow velocity and distribution ratio of cooling water in each stage of the heat exchange section 2. FIG.

[Third embodiment]
Next, an oil cooler 1C according to a third embodiment of the heat exchanger of the present invention will be described. In the oil cooler 1C according to the present embodiment, the same components as those of the oil cooler 1 described above are denoted by the same reference numerals, and descriptions thereof are omitted.

FIG. 17 is a cross-sectional view of an oil cooler 1C according to the third embodiment. The oil cooler 1C shown in FIG. 17 is different from the previously described oil cooler 1 in that the bottom plate 4C is composed of two plates, a first bottom plate 41C and a second bottom plate 42C. In addition, the oil cooler 1C has a cooling water introduction portion 14C that includes a first cooling water introduction portion 141C provided in the first bottom plate 41C and a second cooling water introduction portion 142C provided in the second bottom plate 42C. is different from the oil cooler 1 described previously.

In the oil cooler 1C, the center C2C of the first cooling water introduction portion 141C is aligned with the first core plate 5 and the second 2 In the surface direction of the core plate 6, the center C1 of the cooling water communication channel 32 on the cooling water introduction side toward the outer direction (the outer peripheral direction) of the first core plate 5 and the second core plate 6 and the distance D31. is seperated. In addition, in the direction of the straight line connecting the cooling water introduction side and the cooling water discharge side of the pair of cooling water communication passages 32, the oil cooler 1C is configured such that the center C3C of the second cooling water introduction portion 142C The distance D32 is away from the center C1 of the cooling water communication channel 32 on the cooling water introduction side toward the outer direction (the outer peripheral direction) of the first core plate 5 and the second core plate 6 . In the heat exchanger of the present invention, a plurality of bottom plates 4C forming the cooling water introduction portion 14C may be used like the oil cooler 1C. Further, in the heat exchanger of the present invention, the cooling water introduction portion 14C, like the first cooling water introduction portion 141C and the second cooling water introduction portion 142C, is the cooling water introduction side of the pair of cooling water communication passages 32. The direction of the straight line connecting to the cooling water discharge side may be shifted stepwise with steps. The cooling water introduction portion 14C has a center C2C of an opening (first cooling water introduction portion 141C) on the cooling water inflow side in the thickness direction of the bottom plate 4C, and an opening (second cooling water The center C3C of the introduction portion 142C) is arranged apart in the planar direction.

With the oil cooler 1C as well, the performance can be improved by increasing the flow velocity and distribution ratio of cooling water in each stage of the heat exchange section 2, like the oil cooler 1 described above.

[Fourth embodiment]
Next, an oil cooler 1D according to a fourth embodiment of the heat exchanger of the present invention will be described. In addition, in the oil cooler 1D according to the present embodiment, the same components as those of the previously described oil cooler 1 are denoted by the same reference numerals, and descriptions thereof are omitted.

FIG. 18 is a cross-sectional view of an oil cooler 1D according to the fourth embodiment. The oil cooler 1D shown in FIG. 18 has the cooling water introduction pipe 16D provided on the top plate 3D and the cooling water discharge portion 15D provided on the bottom plate 4D. different from 1. In other words, the inlet side and outlet side of the cooling water are reversed. In the oil cooler 1D, similarly to the previously described oil cooler 1, the position of the center of the cooling water introduction portion 14D is the center C1 of the cooling water communication passage 32 in the plane direction, as indicated by the dashed line C2D in FIG. is separated (offset) by a predetermined distance D4 from the position of .

In the heat exchanger of the present invention, the cooling water introduction part 14 is not limited to the example provided in the bottom plate 4 like the oil cooler 1 described above, but is provided in the top plate 3. may

With the oil cooler 1D as well, the performance can be improved by increasing the flow velocity and distribution ratio of the cooling water in each stage of the heat exchange section 2, like the oil cooler 1 described above.

Although the embodiments of the present invention have been described above, the present invention is not limited to the heat exchangers according to the above-described embodiments of the present invention. including. Moreover, each configuration may be selectively combined as appropriate so as to achieve at least part of the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment may be changed as appropriate according to the specific usage of the present invention.

For example, in the embodiment described above, the cooling water introduction section 14, Oil coolers 1, 1B, 1C, 1D with 14B, 14C, 14D have been described. However, the fluid introduction part provided in the heat exchanger of the present invention may be applied to the oil introduction part (oil introduction part 18) to the heat exchange part.

1, 1B, 1C, 1D, 100, 200, 300, 400, 500, 600... oil cooler, 2... heat exchange part, 3, 3D... top plate, 4, 4C, 4D, 104... bottom plate, 5... third 1 core plate 6 second core plate 7 inter-plate oil passage 8 inter-plate cooling water passage 11 oil passage hole 12 cooling water passage hole 13 hole 14, 14B, 14C , 14D, 114, 214, 314, 414, 514, 614... Cooling water introduction part 15, 15D... Cooling water discharge part 16, 16D... Cooling water introduction pipe 17... Cooling water discharge pipe 18... Oil introduction part , 19... Oil discharge part 20... Emboss 21, 22, 23, 24, 25, 26... Boss part 31... Oil communication channel 32... Cooling water communication channel 41C... First bottom plate 42C... Second bottom plate, 141C... first cooling water introduction part, 142C... second cooling water introduction part

Claims (6)

In a heat exchanger in which a plurality of core plates having a pair of through-holes are stacked to form an inter-plate flow path between which a fluid flows,
a pair of communication channels formed by the pair of through holes and communicating the plurality of inter-plate channels in the stacking direction of the plurality of core plates;
a fluid introduction part forming a channel communicating with one of the pair of communication channels;
a fluid discharge part that forms a channel that communicates with the other of the pair of communication channels,
The heat exchanger, wherein the center of the fluid introduction part is separated from the center of one of the pair of communication channels by a predetermined distance. A part of the fluid introduction part faces the core plate,
A heat exchanger according to claim 1. The center of the fluid introduction part is separated from the center of one of the pair of communication channels in the direction of the straight line connecting one and the other of the pair of communication channels in the plurality of core plates,
A heat exchanger according to claim 1 or 2. The center of the fluid introduction part is separated from the center of one of the pair of communication channels in the direction of the outer periphery of the plurality of core plates in the surface direction of the plurality of core plates,
A heat exchanger according to any one of claims 1 to 3. A base plate is provided on one end side of the plurality of core plates in the stacking direction,
The fluid introduction part is an opening formed in the base plate,
A heat exchanger according to any one of claims 1 to 4. The fluid introduction part is provided at a position where the center of the opening on the inflow side and the center of the opening on the outflow side of the base plate in the thickness direction of the base plate are separated from each other in the plane direction.
A heat exchanger according to any one of claims 1 to 5.

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