CN101504259B - Oil cooler - Google Patents

Abstract

The present invention relates to an oil cooler, and more particularly to an oil cooler provided with communication portions formed therein to allow the oil flowing therein to be evenly distributed and capable of promoting the generation of oil turbulence to Improve the heat exchange performance of oil and cooling water. An oil cooler according to the present invention includes: a pair of inlet/outlet bosses spaced apart from each other by a predetermined distance; an inlet pipe and an outlet respectively joined to the inlet/outlet bosses. a tube; and a plurality of tubes, both ends of which are joined to the inlet/outlet boss (110) to form an oil flow path. Here, wherein the plurality of pipes are arranged in parallel and in multiple stages, and the pipes are formed with a communication portion at a region between the inlet pipe and the outlet pipe for connecting the pipes to the adjacent The tubes are connected to allow oil to flow between the tubes.

Description

Oil cooler

technical field

The present invention relates to an oil cooler, and more particularly to an oil cooler provided with communication portions formed therein to allow the oil flowing therein to be evenly distributed and capable of promoting oil turbulence to Improve the heat exchange performance of oil and cooling water.

Background technique

A radiator is a device used to prevent the temperature of the engine from rising above a predetermined value. The radiator is a heat exchange device used to circulate the cooling water in the engine while circulating the high-temperature cooling water through the radiator through the water pump to absorb the heat generated by combustion in the engine and transfer the heat contained in the high-temperature cooling water to the outside, thereby preventing the engine from overheating and maintaining optimal driving conditions.

Meanwhile, an oil cooler is provided in an automatic transmission vehicle to cool the engine oil in the torque converter or power transmission system. Since the temperature of the oil in the automatic transmission communicated with the oil cooler is higher than that of the radiator, the oil is cooled by exchanging heat with the engine cooling water in the radiator.

The oil cooler can be mainly classified into an internal type oil cooler provided in a radiator case, and an external type oil cooler. Also, the internal type oil cooler can be classified into a double tube type oil cooler having a double tube shape, and a stacked type oil cooler. A dual tube oil cooler and radiator tank assembly is shown in FIG. 1A . The double-tube type oil cooler 10 shown in FIG. 1A is set in the radiator tank, has a concentric main body 11, and is formed with an inlet pipe 13 and an outlet pipe 14 on one side of the main body 11 to allow oil to be introduced Oil in and out of the body 11. The cooling water in the radiator flows in and out of the main body 11 to cool oil supplied to the main body 11 .

In order to improve heat exchange efficiency, a plurality of passages are formed in the main body 11 in the longitudinal direction of the case by inner fins and the like.

However, there is a problem that, in the case where the length of the oil cooler is limited, since the internal type oil cooler has a double pipe shape, the capacity of the oil cooler is limited, and since the oil cooler is used to distribute the oil to the passage formed on the main body The structure is more complicated, so the productivity is lowered.

A stacked type oil cooler 20 is shown in FIG. 1B, and the stacked type oil cooler 20 includes: a pair of oil pillows (header tanks) 25 spaced apart from each other by a predetermined distance as in the structure of a conventional heat exchanger; An inlet pipe 23 and an outlet 24 on the oil conservator 25 ; a plurality of pipes 21 whose both ends are fixed by the oil conservator 25 to form a flow path; and fins 22 arranged between the pipes 21 .

The fins 22 in the stack type oil cooler refer to outer fins arranged between the tubes 21 and formed at the portion of the radiator tank through which the cooling water flows, and additionally in the space through which the oil in the tubes flows. An inner fin is formed.

The above stacked type oil cooler has an advantage in that heat exchange efficiency is improved by arranging tubes and fins in a stacked state, but has a disadvantage in that the manufacturing cost is relatively high.

Also, although the portion formed with the outer fins serves to increase an area for heat exchange with cooling water (liquid flowing in the radiator tank), there is a problem that the portion formed with the outer fins hinders the flow of cooling water.

In addition, the oil flowing in the double pipe type oil cooler and the stack type oil cooler has a high viscosity, so that the oil flow cannot flow smoothly compared with conventional fluids. Thus, the double pipe type oil cooler and the stack type oil cooler have a problem in that it is difficult to evenly distribute the oil introduced through the inlet pipes, so that the heat exchange efficiency decreases.

The flow resistance and flow characteristics of the oil flowing in the oil cooler, and the density of the fins provided in the oil cooler significantly affect the performance of the oil cooler.

FIG. 2 is a perspective view of an inner fin 12 or 22 provided in a conventional oil cooler. As indicated by arrow A, when the oil flows in a direction perpendicular to the partition 30 of the inner fin 12 or 22 , the oil is dispersed in all directions by the partition 30 so that the oil flow turns into a turbulent flow. However, the above structure increases the oil resistance in proportion to the turbulent flow, so that the oil cannot flow smoothly. In order to solve the above-mentioned problems, the density of the inner fins 12 or 22 should be reduced, resulting in a reduction in the heat exchange area, thereby deteriorating the overall heat dissipation performance of the oil cooler.

In order to solve the above-mentioned problems, a structure has been proposed in which the partition 30 of the inner fin 12 or 22 is perpendicular to the oil flow direction indicated by arrow B in FIG. 2 .

The advantage of the structure of the inner fins shown in FIG. 2 is that it reduces the oil resistance and increases the density of the inner fins, thereby improving the heat dissipation performance. However, in the oil cooler including the inner fins having the above-mentioned structure, the oil flow is similar to laminar flow, thus degrading the heat exchange performance due to the reduction of the oil resistance.

In other words, there is a need for an oil cooler capable of directing oil flow in the B direction shown in FIG. 2 to reduce oil resistance and promoting generation of oil turbulence to improve heat dissipation performance.

Contents of the invention

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an oil cooler including a communication portion capable of mixing oil and formed between tubes to distribute the oil evenly.

Another object of the present invention is to provide an oil cooler that can convert oil flow into turbulent flow so that oil can flow smoothly, thereby improving heat exchange efficiency.

The oil cooler according to the present invention includes: a pair of inlet/outlet bosses 110 spaced apart from each other by a predetermined distance; inlet pipes respectively joined to the inlet/outlet bosses 110 120 and an outlet pipe 130; and a plurality of pipes 140, both ends of which are fixed by the inlet/outlet boss portion 110 to form oil flow passages. Herein, the tube 140 is formed with a communication portion 160 at the region between the inlet tube 120 and the outlet tube 130, and the communication portion is used to communicate the tube 140 with the adjacent tube 140 so that Oil flows between the tubes.

In addition, the plurality of communication parts 160 are formed in the longitudinal direction of the tubes 140 , and the communication parts 160 are formed in a line in a stacking direction of the tubes 140 .

The communication portion 160 is formed on the area of all the pipes 140 in a direction perpendicular to the flow direction of the oil in the pipe 140 so that the oil flowing in a specific pipe 140 flows into all other pipes 140 through the communication portion 160 middle. At this time, in the pipe 140 , the flow direction of the oil flowing upstream of the communication portion 160 is the same as the flow direction of the oil flowing downstream of the communication portion 160 .

In addition, the tube 140 is formed by joining an upper plate 141 to a lower plate 142, and one of two adjacent tubes 140 is formed on its plate 142 with a first protrusion protruding vertically toward the other tube 140. part 143, the other tube is formed on its plate 141 with a second protruding part 144 protruding vertically toward the one tube 140, the second protruding part and the inner surface of the first protruding part 143 or The outer surfaces are in close contact, and the communicating portion 160 is formed by joining the first protrusion 143 to the second protrusion 144 .

The oil cooler is characterized in that the tubes 140 have hollows 145 formed by cutting some regions thereof, the hollows 145 of the tubes 140 correspond to each other in the stacking direction of the tubes 140, and are formed There is a communication part 161 connecting the hollow parts 145 of adjacent tubes 140 to each other to form the communication part 160 .

Also, the tube 140 includes an inner fin 150 provided therein, and the inner fin 150 has a finless portion 155 formed by cutting off some area thereof, and the finless portion is formed at the communication portion. 160 so that the oil flowing in the communicating portion 160 can flow smoothly.

Here, the inner fins 150 include a first row and a second row arranged alternately and repeatedly, wherein the second row has the same configuration as the first row, and is identical to the first row of the first row. The bases of the partitions 152 are spaced apart by a predetermined distance, and the first row includes a plurality of first partitions 152 protruding vertically upward from the planar portion 151 , vertically from the first partitions 152 and parallel to the planar portion 151 The extending part 153 extending vertically, and the second partitioning part 154 extending vertically downward from the extending part 153 and parallel to the first partitioning part 152, wherein the first partitioning part 152, the extending part 153 and the second partitions 154 are repeatedly arranged in the first row.

Also, the inner fins 150 are arranged such that the first partition 152 and the second partition 154 are parallel to a flow direction of oil flowing in the oil cooler.

Meanwhile, the oil cooler according to the present invention includes: a pair of inlet pipe 120 and outlet pipe 130 spaced apart from each other by a predetermined distance; a plurality of pipes 140 whose both ends are connected to the inlet pipe 120 and the outlet pipe 130 to form an oil flow passage; and a turbulence generating portion formed on the oil flow passage in the pipe 140 .

Here, the turbulent flow generating part is a communication part 160 through which adjacent tubes 140 are communicated with each other to allow oil to flow between the tubes 140 .

In addition, the communication portion 160 is formed on the area of all the pipes 140 in a direction perpendicular to the flow direction of the oil in the pipe 140, so that the oil flowing in a specific pipe 140 flows into all other pipes 140 through the communication portion 160. Tube 140.

Description of drawings

FIG. 1A is a cross-sectional view showing a conventional double-pipe oil cooler and radiator tank assembly;

FIG. 1B is a perspective view showing a conventional stacked type oil cooler;

Fig. 2 is a perspective view of an inner fin provided in a conventional oil cooler;

3 is a perspective view showing an oil cooler according to an embodiment of the present invention;

Fig. 4A is a partially cutaway perspective view of the oil cooler of the present invention;

Figure 4B is a perspective view of the inner fin shown in Figure 4A;

5A is a partial sectional view showing an oil cooler of the present invention;

Figure 5B is a schematic diagram representing the temperatures at points C and D shown in Figure 5A;

6 is a perspective view showing a pipe of an oil cooler according to another embodiment of the present invention;

Fig. 7 is a diagram showing the manufacturing process of the pipe constituting the oil cooler of the present invention;

Fig. 8 is a diagram showing another manufacturing process of the pipes and the communicating portion constituting the oil cooler of the present invention;

Fig. 9 is another partial cutaway perspective view of the oil cooler of the present invention;

Fig. 10 is an exploded perspective view of pipes constituting the oil cooler shown in Fig. 9;

11 is a cross-sectional view of an oil cooler according to one embodiment of the present invention;

Fig. 12 is a graph showing oil temperature distribution in the oil cooler shown in Fig. 11;

Fig. 13 is a graph showing the average temperature of oil in the tubes of the oil cooler shown in Fig. 11;

Fig. 14 is a graph showing the average temperature of the tube surface of the oil cooler shown in Fig. 11;

Fig. 15 is a graph showing heat flow on the tube surface of the oil cooler shown in Fig. 11;

16A is another graph showing the temperature distribution of the oil cooler shown in FIG. 11; and

FIG. 16B is a graph showing the temperature distribution of the comparative example.

[Detailed description of main components]

100: The oil cooler of the present invention

110: Entrance/exit boss

120: inlet pipe 130: outlet pipe

140: tube 141: upper plate

142: lower plate

143: The first protrusion 144: The second protrusion

150: inner fin

151: Plane Department 152: First Partition

153: extension part 154: second partition

155: Wingless part 160: Connecting part

Detailed ways

The oil cooler 100 having the above structure according to the present invention will be described in more detail below with reference to the accompanying drawings.

Fig. 3 is a perspective view showing the oil cooler 100 of the present invention. As shown in FIG. 3 , the oil cooler 100 of the present invention includes: a pair of inlet/outlet bosses 110 spaced apart from each other by a predetermined distance; an inlet pipe 120 and an outlet pipe 130 respectively joined to the inlet/outlet bosses 110 ; and a plurality of tubes 140 whose both ends are fixed by the inlet/outlet boss portion 110 to form oil flow passages. The oil cooler 100 described above is characterized in that the tubes 140 are arranged in parallel and in multiple stages, and the tubes 140 are formed with a communication portion 160 at a region between the inlet tube 120 and the outlet tube 130 for connecting the tubes 140 to the corresponding Adjacent tubes 140 communicate to allow oil to flow between the tubes.

In other words, the communication portion 160 is formed at a region between the inlet pipe 120 and the outlet pipe 130 in the longitudinal direction of the pipe 140 so that when the oil introduced into the pipe 140 through the inlet pipe 120 flows toward the outlet pipe, the oil can flow into the adjacent pipe. In the pipe 140, thus promoting the generation of oil turbulence.

More specifically, in a conventional oil cooler, oil introduced through an inlet pipe 120 and one inlet/outlet boss 110 flows along a specific pipe 140 and then flows through another inlet/outlet boss 110 and an outlet The tube 130, compared with the conventional oil cooler, the advantage of the oil cooler 100 of the present invention is that the communication part 160 allows the adjacent tubes 140 to communicate with each other, so that the oil introduced into a specific tube 140 can flow into all the tubes through the communication part 160. other tubes 140 , so that when the oil flow rate in a specific tube 140 is too high, the flow rate in the specific tube 140 is dispersed to other tubes 140 so that the flow rate distribution in all the tubes 140 is balanced.

Usually, the oil does not flow smoothly due to excessive viscosity. However, the present invention is advantageous in that the communication portion 160 causes oil turbulence so that oil can flow smoothly in the oil cooler 100 .

At this time, the communication portion 160 introduces only oil into the other pipe 140 , and the flow direction of the oil flowing upstream of the communication portion 160 is the same as that of the oil flowing downstream of the communication portion 160 .

In addition, the problem of the conventional oil cooler is that, in the case where no outer fins are provided between the tubes 140 and the tubes 140, since the tubes 140 extend in the longitudinal direction and stack a plurality of tubes 140, if an external force is applied, the tubes 140 Easy to deform. However, an effect of the oil cooler 100 of the present invention is that the communication part 160 can support the outside of the tube 140 to improve overall durability.

The communication part 160 may be formed by various methods. A hollow area is formed by cutting some area of the pipe 140, and then an additional communication member 161 is joined to the hollow area to allow the hollow area to communicate with the additional communication member 161, so that the pipe 140 can be formed by using the plate 141 and 142 to form a connecting portion.

4A is a partially cutaway perspective view of the oil cooler 100 of the present invention, FIG. 4B is a perspective view of the inner fin 150 shown in FIG. 4A, and FIG. 5A is a partial cutaway view of the oil cooler 100 of the present invention. 4A and 5A illustrate an embodiment in which the communication part 160 is simultaneously formed by using the plates 141 and 142 .

In FIG. 5A , in order to illustrate oil flow, the structure of the inner fin 150 provided in the tube 140 is omitted in FIG. 5A .

In the oil cooler 100 of the present invention, as shown in FIGS. 4A and 5A , the tube 140 is formed by joining an upper plate 141 to a lower plate 142 . In each of two adjacent tubes 140, a first protrusion 143 protruding vertically toward the other tube 140 is formed on the plate 141 or 142 of one tube 140, and on the plate 141 or 142 of the other tube 140 A second protrusion 144 protruding vertically toward the one tube 140 is formed. At this time, the second protrusion 144 is in close contact with the inner or outer surface of the first protrusion 143 , and the communication part 160 is formed by joining the first protrusion 143 to the second protrusion 144 .

In other words, the first protrusion 143 is formed vertically protrudingly on the lower plate 142 constituting one tube 140, and the second protruding portion 144 is formed vertically protruding on the upper plate 141 constituting the other tube 140, so that adjacent One tube 140 and the other tube 140 communicate with each other. The first protrusion 143 and the second protrusion 144 have a hollow configuration so that the tube 140 and the tube 140 communicate with each other through engagement of the first protrusion 143 and the second protrusion 144 .

The joining of the first protrusion 143 and the second protrusion 144 can be achieved by the same welding method as that performed for joining the upper plate 141 and the lower plate 142 constituting the pipe 140, and the joining of the two protrusions The surface is not exposed to the outside, so that the problem of corrosion of the joint surface due to the interaction between the joint surface and the cooling water of the radiator flowing outside the tube can be prevented in advance.

Although FIGS. 4A to 5A show that the first protrusion 143 is formed on the lower plate 142 of one tube 140 and the second protrusion 144 in contact with the outer surface of the first protrusion 143 is formed on the other tube 140, However, the present invention is not limited thereto but can be modified in various ways.

Due to the communication portion 160 formed as described above, as shown in FIG. Oil flows smoothly, so heat exchange efficiency can be further improved.

In addition, FIGS. 3 and 4A show an embodiment of the oil cooler 100 in which the communication part 160 is formed at two positions in the longitudinal direction of the tube 140 and is formed through the entire area of the tube 140 . Here, the communication portion 160 is perpendicular to the flow direction of oil in the pipe 140 . A plurality of communication parts 160 may be formed in the longitudinal direction of the tube 140 according to the capacity of the oil cooler 100, the size of the tube 140, and the like. The communication portion 160 may be perpendicular to the flow direction of oil in the tube 140 (in a direction parallel to the direction of the inlet tube 120 or the outlet tube 130 ), and formed throughout the entire area of the tube 140 , or allow only certain tubes 140 to communicate with each other.

In the oil cooler 100 of the present invention, in the case where a plurality of communication portions 160 are formed, it is preferable that the plurality of communication portions 160 are formed on the same line along the overlapping line of the tubes 140 so that the flow in one tube 140 Oil can flow into all other pipes 140 smoothly.

Meanwhile, the oil cooler 100 of the present invention includes inner fins 150 provided in the tube 140 for turning the oil flow into a turbulent flow to improve heat exchange efficiency. As shown in FIG. 4B , the inner fins 150 include first and second rows arranged alternately. In each first row, there are repeatedly arranged: first partitions 152 protruding vertically upward from the planar portion 151 , extensions 153 extending perpendicularly from the first partitions 152 and parallel to the planar portion 151 , and extending from the first partition 152 . The portion 153 is vertically downward and the second partition portion 154 extends parallel to the first partition portion 152 . Also, each second row has the same configuration as the first row except that the reference position of the first partition 152 in the second row is separated from the reference position of the first partition 152 in the first row by a predetermined distance. At this time, it is preferable that the oil flowing in the oil cooler 100 flows in a direction parallel to the first partition 152 and the second partition 154 to reduce the resistance applied to the oil and increase the density of the fins, thereby improving The heat dissipation performance can be improved, and the generation of oil turbulence can be promoted through the communication part 160 to optimize the heat exchange performance.

In the oil cooler 100 of the present invention, outer fins may be provided between the tubes 140 to allow oil to exchange heat with cooling water flowing in the radiator tank. On the contrary, without providing the outer fins, it is possible to increase the number of stages of the tubes 140 provided in the limited space.

In the absence of outer fins, the flow rate of cooling water that exchanges heat with oil flowing in the tube 140 can be increased, and although the size of the radiator tank becomes smaller, the number of stages of the tube 140 can be increased to improve heat exchange performance.

FIG. 5B is a schematic diagram showing the temperatures at points C and D shown in FIG. 5A. More specifically, (a) of FIG. 5B is a schematic diagram showing changes in temperature along with the height of point C shown in FIG. Schematic representation of temperature variation with height at point D shown in Figure 5A.

As shown in FIG. 5B , before the oil reaches the communication portion 160 , the oil flows in a laminar flow state in which the oil temperature increases toward the inside of the tube 140 , and the temperature difference between the inner surface and the outer surface of the tube 140 is large. However, after the oil passes through the communication portion 160, the temperature difference between the inside and outside of the tube 140 becomes smaller, so that the temperature inside the tube 140 becomes more uniform (see FIG. 12).

FIG. 6 is a perspective view illustrating a tube 140 of an oil cooler 100 according to another embodiment of the present invention. As an example of the tube, FIGS. 3 to 5A show a tube 140 having a communication portion 160 with a rectangular cross section. As shown in FIG. 7 , it is clear that the communication portion 160 has a circular cross section. In addition, if the communication part 160 is connected to the outside of the tube 140 so that the oil flowing in the tube 140 can flow into another tube 140, the shape of the communication part 160 is not limited to a rectangular section and a circular section.

7 is a diagram showing the manufacturing process of the tube 140 constituting the oil cooler 100 of the present invention, and the manufacturing process of the tube 140 of the oil cooler 100 shown in FIGS. 4A, 4B and 5A will be described. As shown in (a) of FIG. 7 , an upper plate 141 and a lower plate 142 constituting the pipe 140 are prepared, and both sides of the upper plate 141 and the lower plate 142 are bent so that the upper plate 141 and the lower plate 142 are combined with each other, as shown in FIG. 7 (b) shown. As shown in (c) of FIG. The communicating portion 160 is provided with an inner fin 150 in the tube.

FIG. 8 is a diagram showing another manufacturing process of the tube 140 and the communicating portion 160 constituting the oil cooler 100 of the present invention. In addition to the plates 141 and 142 shown in FIG. 7, an extruded tube 140 shown in (a) of FIG. 8 may also be employed in the oil cooler 100 of the present invention.

As shown in (b) of FIG. 8 , at this time, each of the extruded tubes 140 has a hollow portion 145 formed by cutting off some region thereof, and the hollow portions 145 of the tubes 140 correspond to each other along the direction in which the tubes 140 are stacked. .

Next, as shown in (c) of FIG. 8 , a hollow tubular communication member 161 that is arranged to form the communication portion 160 and whose height corresponds to the distance between the tubes 140 can be fixed through the hollow portion 145 of the pipe 140 to form the communication portion 160 . In addition to the shapes shown in FIGS. 7 and 8 , if the communication portion 160 connects adjacent tubes 140 to allow oil to flow in the tubes 140 , the communication portion of the oil cooler 100 of the present invention can be made in various ways. Revise.

FIG. 8 shows an embodiment of a communication part 161 forming a communication part, the communication part having protrusions formed on upper and lower peripheral surfaces so that the depth at which the communication part 161 is inserted into the hollow part 145 of the tube 140 can be adjusted.

FIG. 9 is another partially cutaway perspective view of the oil cooler 100 of the present invention, and FIG. 10 is an exploded perspective view of the pipe 140 constituting the oil cooler 100 shown in FIG. 9 . The oil cooler 100 shown in FIG. 9 has the same basic structure as the oil cooler 100 shown in FIG. 4A. However, an inner fin 150 is provided in the tube 140, and a non-fin portion 155 may be formed on a portion of the inner fin 150 corresponding to the communication portion 160, so that the oil flowing in the communication portion 160 can smoothly flow. flow.

The term “finless portion 155 ” refers to a vacant space of the inner fin 150 corresponding to the communication portion 160 . Although the rectangular-shaped finless portion 155 is shown in FIG. 9 , the shape of the finless portion 155 may be formed in various ways depending on factors such as the shape of the communication portion 160 .

The planar portion 151 and the extending portion 153 of the inner fin 150 are formed in a direction perpendicular to the flow direction of oil flowing in the communication portion 160 so that the planar portion 151 and the extending portion 153 may serve as factors for interrupting oil flow. Thus, in the oil cooler 100 of the present invention, the finless portion 155 is formed by cutting out some regions of the inner fins 150 corresponding to the communication portion 160 , thereby allowing oil to flow smoothly between the tubes 140 . As a result, it is possible to maximize the function of the communication portion 160 provided to convert the oil flow into a turbulent flow to improve heat exchange efficiency.

[ Embodiment 1 ]

In Embodiment 1, the oil cooler 100 shown in FIG. 11 is adopted, and the detailed dimensions of the oil cooler 100 used in Embodiment 1 are as follows: the distance between the centerline of the inlet pipe 120 and the centerline of the outlet pipe 130 is 375mm , the distance between one inlet/outlet boss 110 and the other inlet/outlet boss 110 (except for the portion of the tube 140 to be inserted into the inlet/outlet boss 110; hereinafter referred to as The "length of the tube 140" in the X-axis direction) is 346 mm, the width of the tube 140 (the Y-axis direction in FIG. 3 ) is 26 mm, the tubes 140 are stacked in seven stages, and are formed with circular cross-sections at two positions. The connecting portion 160 of the connecting portion 160 is separated from the inlet/outlet boss portion 110 by 84 mm.

At this time, all elements of the oil cooler 100 used in the comparative example are the same as those of the oil cooler used in Embodiment 1 except for the communication portion 160 . Under the condition that the flow rate of the oil introduced through the inlet pipe 120 is 12 l/min and the temperature is 414K, and the flow rate of the radiator cooling water flowing on the outer surface of the oil cooler 100 is 80 l/min and the water temperature is 383K, the Embodiment 1 and a comparative example were tested.

FIG. 12 is a graph showing oil temperature distribution in oil cooler 100 shown in FIG. 11 . Actually, in the temperature distribution of the oil in the tubes 140 before the oil passes through the communication portion 160, the temperature inside one tube 140 is higher and the surface temperature of the tube is lower. Also, it can be confirmed that the temperature distribution inside the tube 140 becomes uniform after the oil passes through the communication portion 160 .

13 is a graph showing the average temperature of oil in the tube 140 of the oil cooler 100 shown in FIG. 11 , and FIG. 14 is a graph showing the average temperature of the surface of the tube 140 of the oil cooler 100 shown in FIG. 11 , FIG. 15 is a graph showing the heat flow rate on the surface of the tube 140 of the oil cooler 100 shown in FIG. 11 (the flow rate ratio of the heat transferred to the cooling water by the plates 141 and 142 per unit area of the plates 141 and 142) picture. Here, the reference point is the outermost portion of the inlet/outlet boss portion 110 where the inlet pipe 120 is disposed, and temperature values at various points along the entire length of the pipe 140 are shown in FIGS. 13 and 14 .

In the above views, the upward/downward dashed line indicates the center line of the communicating portion 160 , the thick solid line indicates Embodiment 1 of the present invention, and the thin dashed line indicates a comparative example.

As shown in FIG. 13 , on the whole, compared with the comparative example, the average temperature of the oil in the pipe 140 of Embodiment 1 of the present invention has decreased, and the average temperature of the oil passing through the first communicating portion 160 and the second communicating portion 160 decreased rapidly, so it can be confirmed that the heat exchange efficiency of Embodiment 1 is improved as compared with Comparative Example.

FIG. 14 is a graph showing the average temperature of the surface of the tube 140 . FIG. 14 shows that Embodiment 1 of the present invention employing the communication part 160 solves the temperature non-uniformity in the tube 140 (high temperature difference between the inside and the surface), so that the oil flowing in the tube 140 can perform heat exchange more effectively . In addition, as time passes, the oil flowing in the tube 140 mixes with the oil on the surface of the tube 140 and the oil exchanges heat with the external cooling water, so the average temperature of the surface of the tube 140 decreases to a value similar to the comparative example. Also, when the oil passes through the second communication portion 160, the effect is significantly obtained (while the effect obtained when the oil passes through the first communication portion 160 is not achieved).

FIG. 15 is a graph showing the average heat flow on the surface of the tube 140 of the oil cooler 100 shown in FIG. 11 . The term "heat flow rate" means the flow ratio of heat transferred to the external cooling water per unit area of the surface of the tube 140, and the graph in FIG. 15 has a curve similar to the graph in FIG. 14 .

Therefore, in Embodiment 1 of the present invention, the temperature distribution in the tube 140 becomes uniform around the communicating portion 160 in comparison with the comparative example in which the communicating portion 160 is not formed, so that proper heat exchange is not performed in the tube 140 . The oil can exchange heat with the external cooling water to improve the heat exchange performance of the oil cooler.

In addition, it can be confirmed that in Embodiment 1 of the present invention, the unevenness of the temperature distribution in the specific tube 140 is solved, and the oil flowing in the specific tube 140 can flow into the other tube 140, so that it is difficult to perform heat exchange. The oil flowing in the tube 140 in the middle position (along the height direction) is mixed to completely convert the oil flow into a turbulent flow, thereby improving the heat exchange efficiency.

Actually, the hatched area in FIG. 15 refers to more heat dissipated relative to the length (mm) of the tube 140 compared to the comparative example.

FIG. 16A is another graph showing the temperature distribution of the oil cooler 100 shown in FIG. 11 , and FIG. 16B is a graph showing the temperature distribution of the comparative example. The above views show the temperature distribution on the inlet/outlet boss portion 110 provided with the inlet pipe 120 and on the portion of the pipe 140 corresponding to the central portion of the oil cooler 100 .

Compared with the comparative example of FIG. 16B , it can be confirmed that in Embodiment 1 of FIG. 16A , the temperature rises significantly centering on a certain region on which the communicating portion is formed.

As a result, since the heat dissipation is proportional to the temperature difference, if the oil temperature rises, the temperature difference between the cooling water and the oil increases to increase the heat dissipation, and the overall average temperature of the oil further decreases.

As shown in FIGS. 13 to 16B , in Embodiment 1 of the present invention in which two communicating portions 160 are formed, the oil flow turns into a stronger turbulent flow, thereby exchanging heat more powerfully, compared with the comparative example. Thus, the temperature of the oil flowing in the oil cooler 100 can be effectively lowered.

Meanwhile, another oil cooler 100 according to the present invention includes: a pair of inlet pipe 120 and outlet pipe 130 spaced apart from each other by a predetermined distance; an oil flow path; and a turbulence generating portion formed on the oil flow path in the tube 140 . At this time, the turbulence generating part is the communication part 160 through which the adjacent tubes 140 are communicated with each other to allow oil to flow between the tubes 140 .

In addition, the communication portion 160 is formed on the area of all the tubes 140 in a direction perpendicular to the oil flow direction in the tube 140 , so that oil flowing in a specific tube 140 can flow into all other tubes 140 through the communication portion 160 . Thus, the flow of oil flowing in the tube 140 is effectively converted into a turbulent flow by the communication portion 160 .

Therefore, the oil cooler of the present invention is advantageous in that a communication portion through which oil flows between the tubes is formed by forming the first protrusion and the second protrusion on the tubes to facilitate generation of oil turbulence through the communication portion. , so that the heat exchange efficiency can be improved.

It should be apparent to those skilled in the art that the conception and specific embodiments disclosed in the above description may be readily used as a basis for modifying or designing other embodiments for carrying out the same purposes of the present invention. It will also be apparent to those skilled in the art that such equivalent embodiments do not depart from the spirit and scope of the invention as set forth in the appended claims.

Claims (10)

1. An oil cooler comprising: a pair of inlet/outlet bosses (110), the pair of inlet/outlet bosses being spaced apart from each other by a predetermined distance; an inlet pipe (120) and an outlet pipe (130) respectively joined to said inlet/outlet boss portion (110); and a plurality of tubes (140) with both ends fixed by the inlet/outlet bosses (110) to form oil flow passages, The oil cooler is characterized in that the plurality of tubes (140) are stacked in parallel and arranged in multiple stages, and the pair of inlet/outlet bosses (110) are arranged along the plurality of tubes (140). Both ends of the arrangement direction of the plurality of pipes (140) are joined, and the pipes (140) are formed with a communication portion ( 160), the communication part is used to make the pipe (140) communicate with the upper and lower adjacent pipes (140) so that the oil flows between the pipes, and the communication part (160) is connected with the pipe (140) ) in the direction perpendicular to the flow direction of the oil is formed on the area of all the tubes (140), and the oil flowing in from the inlet/outlet boss portion (110) and flowing in the specific tube (140) is the same as that in other tubes (140) The oil flowing in the tubes (140) is mixed at the communication portion (160), and the mixed oil flows in the longitudinal direction in each tube (140). 2. The oil cooler according to claim 1, wherein a plurality of the communicating portions (160) are formed along the longitudinal direction of the tube (140). 3. The oil cooler according to claim 2, wherein the communicating portion (160) is formed in a line along a stacking direction of the tubes (140). 4. The oil cooler according to claim 1, wherein, in the pipe (140), the flow direction of the oil flowing upstream of the communication portion (160) is different from that of the oil flowing downstream of the communication portion (160). The oil flows in the same direction. 5. The oil cooler according to claim 1, wherein said tube (140) is formed by joining an upper plate (141) to a lower plate (142), one of two adjacent tubes (140) On its described upper plate (141) or described lower plate (142), a first protrusion (143) protruding vertically towards another tube (140) is formed, and the other tube (140) is on its The lower plate (142) or the upper plate (141) is formed with a second protrusion (144) protruding vertically toward the one tube (140), and the second protrusion is identical to the first protrusion ( 143) in close contact with inner or outer surfaces, and the communicating portion (160) is formed by joining the first protrusion (143) to the second protrusion (144). 6. The oil cooler according to claim 1, wherein the tube (140) has a hollow portion (145) formed by cutting off certain areas thereof, the hollow portion (145) of the tube (140) along The stacking directions of the tubes (140) correspond to each other, and are formed with communication parts (161) connecting hollow parts (145) of adjacent tubes (140) to each other to form the communication part (160). 7. The oil cooler of claim 1, wherein the tube (140) includes inner fins (150) provided therein. 8. The oil cooler according to claim 7, wherein the inner fin (150) has a finless portion (155) formed by cutting off some area thereof, and the finless portion is formed on the same side as the finless portion. The position corresponding to the communication part (160), so that the oil flowing in the communication part (160) flows smoothly. 9. The oil cooler according to claim 7, wherein said inner fins (150) comprise first and second rows arranged alternately and repeatedly, wherein said second row has a The same structure as the row, and a predetermined distance from the reference of the first partition (152) of the first row, the first row includes a plurality of first partitions protruding vertically upward from the planar portion (151) (152), an extension (153) extending vertically from the first partition (152) and parallel to the planar portion (151), and vertically downward from the extension (153) and parallel to the The first partition (152) extends parallel to the second partition (154), wherein the first partition (152), the extension (153) and the second partition (154) are repeatedly arranged in the first row. 10. The oil cooler according to claim 9, wherein the inner fins (150) are arranged such that the first partition (152) and the second partition (154) are cooled with the oil The flow direction of the oil flowing in the device is parallel.

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