Patent Grant
10619935
This invention relates to improvements in a multilayered type oil cooler used for cooling a lubricating oil in an internal combustion engine, a hydraulic oil in an automatic transmission or the like.
For example, in Patent Documents 1 and 2, there is disclosed a heat exchanger taking on such a structure that a plurality of plates are laminated and first fluid paths through which a first fluid flows and second fluid paths through which a second fluid flows are alternately formed thereby achieving heat exchange between both of the fluids.
Patent Document 1: Japanese Patent Application Publication No. H09-292193
Patent Document 2: Japanese Patent Application Publication No. 2001-248996
However, drawbacks have been encountered in the above discussed conventional oil cooler. More specifically, in the case of increasing the amount of exchanged heat in the technique as disclosed by Patent Documents 1 and 2, the number of laminated plates should necessarily be increased. However, a more increased number of laminated plates brings about a more pressure loss and more reduction of the flow velocities of the first and second fluids, so that increasing the number of plates does not necessarily result in a commensurate effect of enhancing the amount of exchanged heat.
Additionally, in the conventional heat exchanger as disclosed in Patent Documents 1 and 2, an inlet portion of the heat exchanger for the first fluid and an outlet portion of the heat exchanger for the first fluid are respectively disposed at both ends of the heat exchanger of the plate lamination direction, while an inlet portion of the heat exchanger for the second fluid and an outlet portion of the heat exchanger for the second fluid are disposed respectively at both ends of the heat exchanger of the plate lamination direction.
In most of the vehicle-mounted heat exchangers, a low temperature-side medium (fluid) such as a cooling water is delivered through a hose etc. connected to the heat exchanger while a high temperature-side medium (fluid) such as oil is directly delivered from an engine block, a transmission case etc. to a passage port attached onto a base portion of the heat exchanger. Such a configuration that the parts at which each medium (fluid) is delivered are separately disposed at both ends of the plate lamination direction is not preferable from the viewpoint of the layout at the time of being mounted on a vehicle.
Thus the conventional heat exchangers have been susceptible to further improvement in heat-exchanging efficiency and layout flexibility.
An aspect of the present invention resides in an oil cooler comprising: (i) a number of core plates each of which has three oil pass holes where oil flows and three cooling water pass holes where cooling water flows; (ii) a heat-exchanging section where the core plates are laminated to define an inter-plate oil flow passage and an inter-plate cooling water flow passage alternately between an adjacent pair of the core plates, in which oil and cooling water can mutually independently flow in a direction perpendicular to a core plate lamination direction while changing its flow direction by a U-turn thereby proceeding in the core plate lamination direction as a whole; (iii) one end part located at one side of the core plate lamination direction and provided with both an oil inlet for introducing oil into the heat-exchanging section and an oil outlet for draining oil out of the heat-exchanging section; and (iv) the other end part located at the other side of the core plate lamination direction and provided with both a cooling water inlet for introducing cooling water into the heat-exchanging section and a cooling water outlet for draining cooling water out of the heat-exchanging section.
According to the present invention, the oil cooler is provided in such a manner that the oil inlet and the oil outlet are disposed intensively at one end part in the core plate lamination direction while the cooling water inlet and the cooling water outlet are disposed intensively at the other end part in the core plate lamination direction. Furthermore, a plurality of oil flow passages are connected to each other in series and a plurality of cooling water flow passages are connected to each other in series, in which arrangement oil and cooling water can mutually independently flow in a direction perpendicular to the core plate lamination direction while changing its flow direction by a U-turn thereby proceeding in the core plate lamination direction as a whole. With this, it becomes possible to ensure an excellent amount of exchanged heat between oil and cooling water with a small number of core plates while keeping their flow velocities from reducing.
In other words, it is possible to enhance a heat-exchanging efficiency while improving layout flexibility at the time of being mounted on a vehicle.
Referring now to the accompanying drawings, some embodiments of an oil cooler according to the present invention will specifically be discussed. In the following description, there will be used the terms “upper”, “lower”, “top”, “bottom” etc. with respect to the posture as shown in
The heat-exchanging section 2 is configured by laminating a plurality of first core plates 6 and a plurality of second core plates 7 alternately one by one, the first core plates 6 and the second core plates 7 basically having a common shape. Between each of the first core plates 6 and the second core plate 7 adjacent thereto, inter-plate oil flow passages and inter-plate cooling water flow passages are alternately disposed. In the oil cooler 1 of the first embodiment, four inter-plate oil flow passages and three inter-plate cooling water flow passages are provided within the heat-exchanging section 2.
In the illustrated example, each inter-plate oil flow passage is constituted between a lower surface of the first core plate 6 and an upper surface of the second core plate 7 while each inter-plate cooling water flow passage is constituted between an upper surface of the first core plate 6 and a lower surface of the second core plate 7. At each of the inter-plate oil flow passages, an almost square fin plate 8 is provided.
A plurality of first and second core plates 6, 7, the top plate 3, the first and second bottom plates 4, 5 and a plurality of fin plates 8 are brazed to be integral with each other. More specifically, these members are formed of the so-called clad material produced by coating an aluminum alloy base material with a brazing material layer, and therefore brazed integral with each other when heated in a furnace under a state of being provisionally assembled in a given arrangement.
The first core plate 6 located at an uppermost portion of the heat-exchanging section 2 is provided to have a configuration somewhat different from that of the other first core plates 6 located at the midsection of the heat-exchanging section 2 while the second core plate 7 located at a lowermost portion of the heat-exchanging section 2 is provided to have a configuration somewhat different from that of the other second core plates 7, taking the relationship with the top plate 3 or the first and second bottom plates 4, 5 into account.
The fin plates 8 are schematically shown in
In other words, a fin plate 8 is a corrugated fin formed by bending one sheet of base material to have a rectangular shape or the shape of a latter U with a constant pitch, and more particularly, an offset type corrugated fin where corrugated lines are so aligned as to deviate the positions of the corrugations from each other with a half pitch.
For convenience in explanation, two direction orthogonal to each other in a plan view of the fin plate 8 are respectively defined as the direction of an arrow X and the direction of an arrow Y, as shown in
Hence the fin plate 8 is constituted of: a top wall 11 formed continuous in the direction X even with a zigzag pattern but not continuous in the direction Y; a bottom wall 12 formed continuous in the direction X even with a zigzag pattern but not continuous in the direction Y; and a great number of leg portions 13 connecting the top wall 11 and the bottom wall 12 to each other. Incidentally, the top wall 11 and the bottom wall 12 are substantially the same member. The great number of leg portions 13 forms broken lines each of which extends in the direction X, in which the broken lines are complementary arranged. In other words, the leg portions 13 establish a staggered layout as a whole.
In the state where the fin plate 8 is bonded between the first core plate 6 and the second core plate 7, the top wall 11 is in intimate contact with the first core plate 6 and the bottom wall 12 is in intimate contact with the second core plate 7; therefore in substance the great number of leg portions 13 are to exist as fins for heat exchange between the first core plate 6 and the second core plate 7, and the leg portions 13 are to take on a structure cutting across the inter-plate oil flow passage.
In the case of flowing oil in the direction X, accordingly, oil can flow linearly along an arrow 14 between adjacent lines of leg portions 13, and therefore the flow passage resistance is relatively small. On the contrary, in the case of flowing in the direction Y adjacent lines of leg portions 13 overlap with each other so that the oil cannot flow linearly but flow meanderingly, and therefore the flow passage resistance is relatively large. Namely, the inter-plate oil flow passage has anisotropy in terms of flow passage resistance between the directions X and Y since the fin plate 8 is interposed therein.
The first core plate 6 and the second core plate 7 are obtained by conducting press forming on a thin base material formed of aluminum alloy to have an almost square shape, and formed with three oil pass holes 15 and three cooling water pass holes 16.
In the oil cooler 1 the first core plate 6 and the second core plate 7 are each provided having three oil pass holes 15 and three cooling water pass holes 16. With this arrangement, it becomes feasible to dispose both an oil inlet 17 for introducing oil into the heat-exchanging section 2 and an oil outlet 18 for draining oil out of the heat-exchanging section 2, at a lower end servings as one end part located at one side of the core plate lamination direction, and additionally it becomes possible to provide both a cooling water inlet 19 for introducing cooling water into the heat-exchanging section 2 and a cooling water outlet 20 for draining cooling water out of the heat-exchanging section 2 at an upper end serving as the other end part located at the other side of the core plate lamination direction.
Incidentally, a member illustrated in
The oil pass holes 15 are constituted of: a retreating oil pass hole 25 piercing through the heat-exchanging section 2 in the core plate lamination direction to establish an oil-returning channel 24 (as shown in
As shown in
By the way, a portion illustrated by reference numeral 28 in
In the presence of the oil blockage portion 28, the four inter-plate oil flow passages are separated into a group of upper oil flow passages constituted of two upper inter-plate oil flow passages and a group of lower oil flow passages constituted of two lower inter-plate oil flow passages. The group of upper oil flow passages and the group of lower oil flow passages are connected in series, and the inter-plate oil flow passages of each group are connected substantially in parallel with each other. More specifically, by virtue of the presence of the oil blockage portion 28, oil is adapted to change its flow direction rightward or leftward inside the heat-exchanging section 2 by a U-turn thereby proceeding in the core plate lamination direction as a whole.
The cooling water pass holes 16 are constituted of: a retreating cooling water pass hole 31 piercing through the heat-exchanging section 2 in the core plate lamination direction to establish a cooling water-returning channel 30 (as shown in
As shown in
By the way, a portion illustrated by reference numeral 34 in
In the presence of the cooling water-blockage portion 34, the three inter-plate cooling water flow passages are separated into a group of upper cooling water flow passages constituted of two upper inter-plate cooling water flow passages and a group of lower cooling water flow passage constituted of one lower inter-plate cooling water flow passage. The group of upper cooling water flow passages and the group of lower cooling water flow passage are connected in series, and the inter-plate cooling water flow passages of each group are connected substantially in parallel with each other. More specifically, by virtue of the presence of the cooling water-blockage portion 34, cooling water is adapted to change its flow direction rightward or leftward inside the heat-exchanging section 2 by a U-turn thereby proceeding in the core plate lamination direction as a whole.
The retreating oil pass hole 25 and the retreating cooling water pass hole 31 are disposed at locations offset along at least one flow direction selected from the group consisting of: the mainstream of oil flowing inside the inter-plate oil flow passage from one of a pair of advancing oil pass holes 26 (formed in the core plate 6 or 7) to the other; and the mainstream of cooling water flowing inside the inter-plate cooling water flow passage from one of a pair of advancing cooling water pass holes 32 (formed in the core plate 6 or 7) to the other.
In a plan view of the core plate of the first embodiment, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are aligned on the diagonal line of the core plate on which a pair of advancing cooling water pass holes 32 are also located, and more specifically, these are disposed at locations offset along the flow direction of the cooling water mainstream. In the plan view of the core plate of the first embodiment, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are not disposed at locations offset along the flow direction of the oil mainstream.
Moreover, in the first embodiment and in the state where the fin plate 8 is installed inside the inter-plate oil flow passage, the direction X of the fin plate 8 along which the flow passage resistance is relatively small is arranged parallel with either one of two adjacent edges (of the almost square-shaped first and second core plates 6, 7) perpendicular to each other, while the direction Y of the fin plate 8 along which the flow passage resistance is relatively large is arranged parallel with the other of the two adjacent edges (of the almost square-shaped first and second core plates 6, 7) perpendicular to each other. With this arrangement, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 located aligned on a diagonal line of the core plate to be offset along the direction Y of the fin plate 8 where the flow passage resistance is relatively large.
In the first core plate 6, the periphery of each of the advancing oil pass holes 26 is formed into a boss section 35 somewhat protruding toward the inter-plate cooling water flow passage while the periphery of each of the advancing cooling water pass holes 32 is formed into a boss section 38 somewhat protruding toward the inter-plate oil flow passage. Furthermore, in the first core plate 6, the periphery of the retreating oil pass hole 25 is formed into a boss section 36 somewhat protruding toward both the inter-plate cooling water flow passage and the inter-plate oil flow passage, while the periphery of the retreating cooling water pass hole 31 is formed into a boss section 37 somewhat protruding toward both the inter-plate cooling water flow passage and the inter-plate oil flow passage.
In the second core plate 7, the periphery of each of the advancing cooling water pass holes 32 is formed into a boss section 38 somewhat protruding toward the inter-plate oil flow passage, while the periphery of each of the advancing oil pass holes 26 is formed into a boss section 35 somewhat protruding toward the inter-plate cooling water flow passage. Furthermore, in the second core plate 7, the periphery of the retreating oil pass hole 25 is formed into a boss section 36 somewhat protruding toward both the inter-plate cooling water flow passage and the inter-plate oil flow passage, while the periphery of the retreating cooling water pass hole 31 is formed into a boss section 37 somewhat protruding toward both the inter-plate cooling water flow passage and the inter-plate oil flow passage.
Consequently, by combining the first core plate 6 and the second core plate 7 alternately, it becomes possible to keep a certain clearance between the first core plate 6 and the second core plate 7, the clearance serving as the inter-plate cooling water flow passage or the inter-plate oil flow passage.
The boss sections 35 of the first core plate 6 (which boss sections are upwardly projectingly formed at the peripheries of the advancing oil pass holes 26) are respectively joined to the boss sections 35 of the second core plate 7 (which boss sections are downwardly projectingly formed at the peripheries of the advancing oil pass holes 26). With this, two adjacent inter-plate oil flow passages (or a pair of upper and lower inter-plate oil flow passages) come to communicate with each other and divided from the inter-plate cooling water flow passage intervening therebetween. Accordingly, in the state where a number of first and second core plates 6, 7 are assembled, the inter-plate oil flow passages are in communication with each other through a number of advancing oil pass holes 26 so that in the heat-exchanging section 2 oil can flow along the core plate lamination direction as a whole.
The boss sections 38 of the second core plate 7 (which boss sections are upwardly projectingly formed at the peripheries of the advancing cooling water pass holes 32) are respectively joined to the boss sections 38 of the first core plate 6 (which boss sections are downwardly projectingly formed at the peripheries of the advancing cooling water pass holes 32). With this, two adjacent inter-plate cooling water flow passages (or a pair of upper and lower inter-plate cooling water flow passages) come to communicate with each other and divided from the inter-plate oil flow passage intervening therebetween. Accordingly, in the state where a number of first and second core plates 6, 7 are assembled, the inter-plate cooling water flow passages are in communication with each other through a number of advancing cooling water pass holes 32 so that in the heat-exchanging section 2 cooling water can flow along the core plate lamination direction as a whole.
The boss section 36 of the first core plate 6 (which boss section is upwardly and downwardly projected at the periphery of the retreating oil pass hole 25) is joined to the boss section 36 of the second core plate 7 (which boss section is upwardly and downwardly projected at the periphery of the retreating oil pass hole 25). The boss section 37 of the first core plate 6 (which boss section is upwardly and downwardly projected at the periphery of the retreating cooling water pass hole 31) is joined to the boss section 37 of the second core plate 7 (which boss section is upwardly and downwardly projected at the periphery of the retreating cooling water pass hole 31).
The boss section 36 of the second core plate 7 (which boss section is upwardly and downwardly projected at the periphery of the retreating oil pass hole 25) is joined to the boss section 36 of the first core plate 6 (which boss section is upwardly and downwardly projected at the periphery of the retreating oil pass hole 25). The boss section 37 of the second core plate 7 (which boss section is upwardly and downwardly projected at the periphery of the retreating cooling water pass hole 31) is joined to the boss section 37 of the first core plate 6 (which boss section is upwardly and downwardly projected at the periphery of the retreating cooling water pass hole 31).
Therefore, in the state where a number of first and second core plates 6, 7 are assembled, the oil-returning channel 24 and the cooling water-returning channel 30 piercing the heat-exchanging section 2 in the core plate lamination direction are established. The oil-returning channel 24 does not directly communicate with the inter-plate oil flow passages formed between the first core plate 6 and the second core plate 7. The cooling water-returning channel 30 does not directly communicate with the inter-plate cooling water flow passages formed between the first core plate 6 and the second core plate 7.
Moreover, the first core plate 6 and the second core plate 7 are formed with a number of protrusions 43 protruding toward the side of the inter-plate cooling water flow passage.
The fin plate 8 incorporated in the inter-plate oil flow passage is provided having six openings 44 respectively corresponding to the three oil pass holes 15 and the cooling water pass holes 16. The openings 44 are defined to be larger than the three oil pass holes 15 and the cooling water pass holes 16 in diameter so as to allow some margins on the corresponding boss sections 35, 36, 37, 38.
Onto the uppermost portion of the heat-exchanging section 2, the top plate 3 is stacked as discussed above. The top plate 3 is provided including: the cooling water inlet 19 communicating with either one of the pair of advancing cooling water pass holes 32 defined at the uppermost portion of the heat-exchanging section 2; the cooling water outlet 20 communicating with the retreating cooling water pass hole 31 defined at the uppermost portion of the heat-exchanging section 2; and the above-mentioned swelling portion 27.
Onto the lowermost portion of the heat-exchanging section 2, the first bottom plate 4 and the second bottom plate 5 each of which has a sufficient rigidity and a relatively large thickness are stacked as mentioned above. Each of the first bottom plate 4 and the second bottom plate 5 is provided including: the oil inlet 17 communicating with either one of the pair of advancing oil pass holes 26, 26 defined at the lowermost portion of the heat-exchanging section 2; and the oil outlet 18 communicating with the retreating oil pass hole 25 defined at the lowermost portion of the heat-exchanging section 2. The first bottom plate 4 is to be connected to a cylinder block etc. (not shown) at the oil inlet 17 and the oil outlet 18, through a gasket etc. for sealing them (though not shown). Additionally, the first bottom plate 4 is to cover the communication hole 33 formed piercing the second bottom plate 5.
In the oil cooler 1 of the first embodiment, the first and second core plates 6, 7 each are formed to have three oil pass holes 15 and three cooling water pass holes 16, which makes it possible to provide the oil inlet 17 and the oil outlet 18 intensively at one end part in the core plate lamination direction while providing the cooling water inlet 19 and the cooling water outlet 20 intensively at the other end part in the core plate lamination direction. In other words, the oil inlet 17 and the oil outlet 18 may intensively be disposed at the lower end of the oil cooler 1 while the cooling water inlet 19 and the cooling water outlet 20 may intensively be disposed at the upper end of the oil cooler 1. With such an arrangement it becomes possible to enhance the layout flexibility at the time of being mounted on a vehicle.
Furthermore, since oil and cooling water mutually independently flows inside the heat-exchanging section 2 in a direction perpendicular to the core plate lamination direction while changing their flow direction by a U-turn thereby proceeding in the core plate lamination direction as a whole, it becomes possible to ensure an excellent amount of exchanged heat between oil and cooling water with a small number of first and second core plates 6, 7 while keeping their flow velocities from reducing.
In the inter-plate oil flow passage, the smaller the cross-sectional area of an oil mainstream path (which cross section is perpendicular to the oil mainstream) is, the larger the pressure loss becomes during the oil flow. Meanwhile, in the inter-plate cooling water flow passage, the smaller the cross-sectional area of a cooling water mainstream path (which cross section is perpendicular to the cooling water mainstream) is, the larger the pressure loss becomes during the cooling water flow. In view of this fact, the first embodiment of the present invention is configured such that, in a plan view of the core plate, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are aligned on a diagonal line of the core plate on which the pair of advancing cooling water pass holes 32 are located, and more specifically, these are disposed at locations offset along the flow direction of the cooling water mainstream. With this configuration, in the inter-plate cooling water flow passage, the reduction of the cross-sectional area of the cooling water mainstream path caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31 can relatively be suppressed. Namely, concerning the inter-plate cooling water flow passage, it is possible to suppress an increase of pressure loss caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31.
Since the advancing oil pass holes 26 and the advancing cooling water pass holes 32 are located in the vicinity of the outer edge of the core plate in a plan view of the core plate, it is possible to inhibit the pressure loss in the inter-plate oil flow passage or the inter-plate cooling water flow passage from increasing.
Moreover, since the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are provided to be offset along the direction Y of the fin plate 8 where the flow passage resistance is relatively large, it is possible to suppress an increase of pressure loss of the inter-plate oil flow passage caused by disposing the fin plate 8 inside the inter-plate oil flow passage.
Incidentally, in the case of giving an anisotropy to the flow passage resistance of the inter-plate cooling water flow passage by providing the first core plate 6 and the second core plate 7 with a number of protrusions 43, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 may be located to be offset in a direction along which the flow passage resistance is increased by the formation of a number of protrusions 43. With this, it is possible to suppress an increase of pressure loss of the inter-plate cooling water flow passage caused by the formation of a number of protrusions 43.
The present invention will hereinafter be discussed with reference to other embodiments, in which the same member as in the above-mentioned first embodiment will be given the same reference numeral, and redundant explanations will be omitted.
Referring now to
In the second embodiment, the top plate 3 attached to the top surface of the heat-exchanging section 2 is formed to have: the oil inlet 17; the oil outlet 18; the cooling water inlet 19; and the cooling water outlet 20 as shown in
Additionally, the second bottom plate 5 is formed having: the communication hole 33 with which either one of the pair of advancing cooling water pass holes 32 and the retreating cooling water pass hole 31 come to communicate with each other at the lowermost portion of the heat-exchanging section 2; and a second communication hole 52 for bringing either one of the pair of advancing oil pass holes 26 and the retreating oil pass hole 25 into communication with each other at the lowermost portion of the heat-exchanging section 2. Additionally, the first bottom plate 4 is to cover the communication hole 33 and the second communication hole 52 formed piercing the second bottom plate 5.
A member illustrated by reference numeral 53 in
As shown in
In the presence of the oil blockage portion 28, the four inter-plate oil flow passages are separated into a group of upper oil flow passages constituted of two upper inter-plate oil flow passages and a group of lower oil flow passages constituted of two lower inter-plate oil flow passages. The group of upper oil flow passages and the group of lower oil flow passages are connected in series, and the inter-plate oil flow passages of each group are connected substantially in parallel with each other. More specifically, by virtue of the presence of the oil blockage portion 28, oil is adapted to change its flow direction rightward or leftward inside the heat-exchanging section 2 by a U-turn thereby proceeding in the core plate lamination direction as a whole.
As shown in
In the presence of the cooling water-blockage portion 34, the three inter-plate cooling water flow passages are separated into a group of upper cooling water flow passages constituted of two upper inter-plate cooling water flow passages and a group of lower cooling water flow passage constituted of one lower inter-plate cooling water flow passage. The group of upper cooling water flow passages and the group of lower cooling water flow passage are connected in series, and the inter-plate cooling water flow passages of each group are connected substantially in parallel with each other. More specifically, by virtue of the presence of the cooling water-blockage portion 34, cooling water is adapted to change its flow direction rightward or leftward inside the heat-exchanging section 2 by a U-turn thereby proceeding in the core plate lamination direction as a whole.
Thus, the almost same effects as in the above-mentioned first embodiment can be obtained also in the second embodiment.
In the above-mentioned first and second embodiments, the flow direction of the oil mainstream and the flow direction of the cooling water mainstream are in parallel with different diagonal lines of the almost square-shaped first and second core plates 6, 7, respectively. Accordingly, if decomposing the flow vectors of oil and those of cooling water into directions of two edges of the first and second core plates 6, 7 which edges are adjacent and perpendicular to each other, the decomposed flow vectors of them should not oppose to each other in the direction of one edge but oppose to each other in the direction of the other edge. In other words, the flow of oil in the inter-plate oil flow passage and the flow of cooling water in the inter-plate cooling water flow passage establish a counterflow to each other, though not a perfect one. In the case where the core plate has a rectangular shape, a decomposed vector serving as the side establishing the counterflow may be oriented parallel with the direction of the longer side, with which the flow of oil in the inter-plate oil flow passage and the flow of cooling water in the inter-plate cooling water flow passage may establish a more perfect counterflow.
The example discussed in the first and second embodiments involves four first core plates 6, four second core plates 7, four inter-plate oil flow passages, and three inter-plate cooling water flow passages. However, the number of each of the first and second core plate 6, 7 is not particularly limited to four and it may be suitably modified, and in other words, the number of each of the inter-plate oil flow passage and the inter-plate cooling water flow passage may suitably be modified.
In the above-mentioned first and second embodiments oil and cooling water each change its flow direction between rightward and leftward inside the heat-exchanging section 2 once and for all by making one U-turn: however, only if suitably blocking either one of the pair of advancing oil pass holes 26 or either one of the pair of advancing cooling water pass holes 32 in a plurality of first and second core plates 6, 7 of suitable positions, it becomes possible to change the flow direction of oil and cooling water between rightward and leftward inside the heat-exchanging section 2 two or more times by a plurality of U-turns thereby delivering the oil and cooling water in the core plate lamination direction as a whole.
The flow direction of oil or cooling water in the heat-exchanging section 2, as discussed in the first and second embodiment may be reversed. More specifically, oil may be introduced from the oil outlet 18 and it may exit from the oil inlet 17, and cooling water may be introduced from the cooling water outlet 20 and it may exit from the cooling water inlet 19.
The retreating oil pass hole 25 and the retreating cooling water pass hole 31 are not limited to the locations as exemplified by the first and second embodiments, and therefore these may be formed at locations as shown in
In a core plate 61 as shown in
In the inter-plate oil flow passage of an oil cooler to which the above-mentioned core plate 61 is used, the reduction of the cross-sectional area of the oil mainstream path caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31 can relatively be suppressed. Namely, concerning the inter-plate oil flow passage, it is possible to suppress an increase of pressure loss caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31.
In a core plate 62 as shown in
In both the inter-plate oil flow passage and the inter-plate cooling water flow passage of an oil cooler to which the above-mentioned core plate 62 is used, it is possible to suppress an increase of pressure loss caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31. Namely, it is possible in the inter-plate oil flow passage to relatively suppress the reduction of the cross-sectional area of the oil mainstream path caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31, while it is possible in the inter-plate cooling water flow passage to relatively suppress the reduction of the cross-sectional area of the cooling water mainstream path caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31.
Furthermore, in the case of disposing the fin plate 8 in the inter-plate oil flow passage of an oil cooler to which the core plate 62 is employed, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 may be so located as to be offset along the direction Y of the fin plate 8 where the flow passage resistance is relatively large, with which it becomes possible in the inter-plate oil flow passage to suppress an increase of pressure loss caused by disposing the fin plate 8 inside the inter-plate oil flow passage. Particularly if the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are aligned in series along the direction Y of the fin plate 8 where the flow passage resistance is relatively large, an increase of pressure loss caused in the inter-plate oil flow passage by disposing the fin plate 8 inside the inter-plate oil flow passage can be suppressed to maximum.
In a core plate 63 as shown in
In both the inter-plate oil flow passage and the inter-plate cooling water flow passage of an oil cooler to which the above-mentioned core plate 63 is employed, it is possible to suppress an increase of pressure loss caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31. Namely, it is possible in the inter-plate oil flow passage to relatively suppress the reduction of the cross-sectional area of the oil mainstream path caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31, while it is possible in the inter-plate cooling water flow passage to relatively suppress the reduction of the cross-sectional area of the cooling water mainstream path caused by the formation of the retreating oil pass hole 25 and the retreating cooling water pass hole 31.
Furthermore, in the case of disposing the fin plate 8 in the inter-plate oil flow passage of an oil cooler to which the core plate 63 is employed, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 may be so located as to be offset along the direction Y of the fin plate 8 where the flow passage resistance is relatively large, with which it becomes possible in the inter-plate oil flow passage to suppress an increase of pressure loss caused by disposing the fin plate 8 inside the inter-plate oil flow passage. Particularly if the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are aligned in series along the direction Y of the fin plate 8 where the flow passage resistance is relatively large, an increase of pressure loss caused in the inter-plate oil flow passage by disposing the fin plate 8 inside the inter-plate oil flow passage can be suppressed to maximum.
In a core plate 64 as shown in
The pair of advancing oil pass holes 26 is located on a diagonal line of the core plate to be symmetric with each other with respect to the center of the core plate.
The retreating oil pass hole 25 and the retreating cooling water pass hole 31 are located on a diagonal line of the core plate to be symmetric with each other with respect to the center of the core plate.
The pair of advancing cooling water pass holes 32 is formed such that one of them is located between the retreating oil pass hole 25 and one of the pair of advancing oil pass holes 26 while the other is located between the retreating cooling water pass hole 31 and the other of the pair of advancing oil pass holes 26.
In an oil cooler employing the core plate 64, the advancing oil pass holes 26 are located adjacent to the advancing cooling water pass holes 32, respectively. With this, the flow direction of oil in the inter-plate oil flow passage and that of cooling water in the inter-plate cooling water flow passage may become nearly opposed to each other so as to relatively improve cooling efficiency. Additionally, as compared with the case of forming the retreating oil pass hole 25 and the retreating cooling water pass hole 31 at the center of the core plate 64, an increase of pressure loss can be suppressed. In other words, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are located at the outer edge of the inter-plate oil flow passage and at the inter-plate cooling water flow passage, respectively, thereby having difficulty in inhibiting both the oil mainstream and the cooling water mainstream, so that it becomes possible, in both the inter-plate oil flow passage and the inter-plate cooling water flow passage, to further suppress an increase of pressure loss caused by forming the retreating oil pass hole 25 and the retreating cooling water pass hole 31.
In a core plate 65 as shown in
A member illustrated in
In an oil cooler employing the core plate 65, an increase of pressure loss can be suppressed as compared with the case of forming the retreating oil pass hole 25 and the retreating cooling water pass hole 31 at the center of the core plate 65. In other words, the retreating oil pass hole 25 and the retreating cooling water pass hole 31 are located adjacent to different advancing cooling water pass holes 32, respectively, thereby having difficulty in inhibiting both the oil mainstream and the cooling water mainstream, so that it becomes possible, in both the inter-plate oil flow passage and the inter-plate cooling water flow passage, to further suppress an increase of pressure loss caused by forming the retreating oil pass hole 25 and the retreating cooling water pass hole 31.
The entire contents of Japanese Patent Application 2014-264673 filed Dec. 26, 2014 are herein incorporated by reference. Although the invention has been described above by reference to certain embodiments and examples of the invention, the invention is not limited to the embodiments and examples described above. Modifications and variations of the embodiments and examples described above will occur to those skilled in the art, in light of the above teachings. For example, the outer shapes of the core plate and the fin plate are not limited to almost square ones (though in the above-mentioned embodiments the core plate and the fin plate each are shaped generally into a square) and therefore these may be circular, ellipsoidal, rectangular or the like. The scope of the invention is defined with reference to the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2014-264673 | Dec 2014 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 5964283 | Pavlin | Oct 1999 | A |
| 20100206516 | Muller-Lufft | Aug 2010 | A1 |
| 20120325446 | Wakamatsu | Dec 2012 | A1 |
| Number | Date | Country |
|---|---|---|
| 19654365 | Jun 1998 | DE |
| 10049890 | Apr 2002 | DE |
| 9-292193 | Nov 1997 | JP |
| 2001-248996 | Sep 2001 | JP |
| Number | Date | Country | |
|---|---|---|---|
| 20160187067 A1 | Jun 2016 | US |
