JP2008039212A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of improving cooling performance by dispersing a medium circulated along an inner fin in a passage of an element in the width direction to approximately uniformly flow, and reducing circulating resistance of the circulated medium. <P>SOLUTION: This heat exchanger comprises spaces O1, O2 formed by cutting an outer periphery of a longitudinal end portion of the inner fin 6 inward while extending in the width direction, and spaces O3, O4 cut from opening holes 6a, 6b of the inner fin 6 toward peripheral edges opposed to each other in the width direction of the element 2 at the circumference of both opening holes 6a, 6b of the inner fin 6 between both shells 4, 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger, and more particularly, to a heat exchanger including an element containing an inner fin.

Conventionally, it has a pair of shells provided with communication holes at both ends in the longitudinal direction, and the peripheral edges of the pair of shells are joined to each other to form a passage, and the communication holes are accommodated in the elements. The technique of the heat exchanger provided with the inner fin which has an opening hole in the respectively corresponding position is known (refer patent documents 1 and 2).
JP 2002-107082 A JP-A-11-72295

  However, in the conventional heat exchanger, most of the flow medium that flows along the inner fin in the passage of the element flows so as to linearly connect both opening holes. There was a problem that the outer periphery of the inner fin was not functioning much.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to disperse the distribution medium flowing along the inner fin in the passage of the element in the width direction so as to flow substantially uniformly. It is possible to provide a heat exchanger that can improve the cooling performance by reducing the distribution resistance of the distribution medium.

  The invention according to claim 1 of the present invention has a pair of shells provided with communication holes at both longitudinal ends, and the elements that form a passage inside by joining the peripheral edges of the pair of shells; A heat exchanger comprising an inner fin housed in an element and having an opening hole at a position corresponding to each of the communication holes, and both shells around at least one of the opening holes of the inner fin; And a space provided so as to extend in the width direction by notching the outer periphery of the end portion in the longitudinal direction of the inner fin, and at least one of the peripheral edges facing the width direction of the element from the opening hole of the inner fin And a space provided by being cut away toward the surface.

  In the first aspect of the present invention, the element has a pair of shells provided with communication holes at both ends in the longitudinal direction, and the peripheral edges of the pair of shells are joined together to form a passage inside. And an inner fin housed in the element and having an opening hole at a position corresponding to each of the communication holes, around the opening hole of at least one of the opening holes of the inner fin. Between the two shells, a space provided so as to extend in the width direction by notching the outer periphery of the longitudinal end portion of the inner fin, and a peripheral edge facing the element in the width direction from the opening hole of the inner fin And a space formed by cutting out toward at least one of the two, the distribution medium flowing along the inner fin in the passage of the element is dispersed in the width direction to be substantially uniform. Succoth can, thereby improving the cooling performance by reducing the flow resistance of the flowing medium.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
In the first embodiment, a case where the heat exchanger is applied to a water-cooled oil cooler will be described.
1 is a plan view of an oil cooler employing a heat exchanger according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line S2-S2 in FIG. 1, and FIG. 3 is an exploded view of the element according to the first embodiment. 4 is an exploded perspective view (a part of the inner fin is omitted), and FIG. 5 is a cross-sectional view taken along line S5-S5 in FIG.

  6 is a perspective view of the element of the first embodiment, FIG. 7 is a diagram for explaining the stacking of the elements of the first embodiment, and FIG. 8 is a sectional view taken along line S8-S8 in FIG. It is.

First, the overall configuration will be described.
As shown in FIGS. 1 and 2, the oil cooler 1 in which the heat exchanger of the first embodiment is employed includes a core portion 3 in which a plurality of (two in the first embodiment) elements 2 are stacked. Yes.

As shown in FIGS. 3 and 4, each element 2 includes a pair of substantially dish-shaped shells 4, 5 and an inner fin 6 interposed between the shells 4, 5.
Cylindrical annular protrusions 4b having communication holes 4a are formed at both ends in the longitudinal direction of the shell 4, respectively, while cylindrical annular protrusions 5b having communication holes 5a are formed at both longitudinal ends of the shell 5. Each is formed.
Further, arcuate arc portions 4c and 5c (see FIG. 4) are formed on the outer circumferences of both end portions in the longitudinal direction of both shells 4 and 5, respectively.

As shown in FIGS. 4 and 5, the inner fin 6 is formed in a corrugated shape extending in the longitudinal direction of the element 2, and the communication holes 4 a and 4 a of the annular protrusions of the shells 4 and 5 at both longitudinal ends. Opening holes 6a and 6b are formed at positions corresponding to 5a, respectively.
In addition, arc-shaped notches 6 c that are notched inward are formed on the outer periphery of both ends in the longitudinal direction of the inner fin 6.

  As shown in FIG. 6, the element 2 has the inner fin 6 accommodated in a state where both shells 4, 5 are overlapped in the middle and their peripheral edges are joined to each other, thereby causing the element 2 to move in the longitudinal direction. In addition to the passage 2a extending, the both ends in the longitudinal direction surround the communication hole 4a (5a) in the width direction between the notch 6c of the inner fin 6 and the arc portions 4c and 5c of the element 2. Spaces O1 and O2 extending in an arc shape are formed.

Further, as shown in FIG. 3, the outer diameter W1 of the annular protrusion 4b of the shell 4 is formed smaller than the inner diameter W2 of the annular protrusion 5b of the shell 5, so that as shown in FIG. The core portion 3 is formed by fitting and laminating the annular projection 4b and the annular projection 5b that face each other with the annular sheet S1 interposed between the adjacent elements 2.
In addition, the annular protrusion 5b of the element 2 at the lowest end of the core 3 is omitted and closed.

  Therefore, as shown in FIG. 2, an inlet side passage R <b> 1 communicating with one end side of each element 2 is formed on one side of the core portion 3, and the other end of each element 2 is formed on the other side of the core portion 3. An outlet side passage R2 communicating with the side is formed.

  In addition, all the structural members which comprise the oil cooler 1 of the first embodiment are made of aluminum, and at least one side of the joints to which the respective structural members are joined has a clad layer (brazing sheet) made of a brazing material. Each of the joint portions is integrally brazed and fixed by being transported to a heating furnace (not shown) in a pre-assembled state and heat-treated.

Next, the operation will be described.
The oil cooler 1 configured in this way is accommodated in a downstream tank of a radiator (not shown) and is not shown in the annular projection 4b on the inlet side passage R1 side in the element 2 at the uppermost end of the core part 3. While the input port is fixed in the inserted state, it is fixed in the state where the output port (not shown) is inserted in the annular protrusion 4b on the outlet side passage R2.

  As shown in FIG. 2, the hot oil (shown by broken line arrows) that flows into the inlet-side passage R <b> 1 of the core portion 3 through the input port (not shown) is the inner fin 6 in the passage 2 a of each element 2. The refrigerant is cooled by exchanging heat with a low-temperature circulation medium in a downstream tank of a radiator (not shown) and then flowing into the outlet side passage R2 and discharged from an output port (not shown). It functions as a cooler 1.

Here, in the conventional invention, since most of the oil flowing along the inner fin in the passage of the element flows in such a way as to linearly connect both the opening holes, the inner fin is mainly used. There was a problem that the vicinity of the outer periphery of the slab was not functioning much.
Further, it has been found that the oil tends to stagnate particularly in the vicinity of the outer periphery of both end portions in the longitudinal direction of the inner fin, which is one of the causes for the cooling performance to deteriorate.

  On the other hand, in the oil cooler 1 of the first embodiment, at both ends in the longitudinal direction of each element 2, an arc shape is formed in the width direction between the notch portion 6 c of the inner fin 6 and the arc portions 4 c and 5 c of the element 2. Since the extending spaces O1 and O2 are formed, as shown in FIG. 8, a part of the oil (shown by broken line arrows) introduced from the opening hole 6a into the passage 2a flows into the space O1 and the inner fin 6 After being dispersed in the width direction, the oil flows along the inner fin 6, thereby allowing the oil flowing along the inner fin 6 to flow substantially uniformly in the passage 2 a to reduce the flow resistance and at the same time greatly increase the heat dissipation performance. Can be improved.

  Further, a part of the oil flows into the space O2 and then is discharged to the opening hole 6b, whereby the flow resistance can be further reduced.

  Further, compared with the case where the space O2 is omitted or the space O1 is omitted and only the space O2 is formed, the oil can be smoothly distributed and distributed in the width direction at the initial stage of the oil distribution. In addition, the upstream hot oil is more easily dispersed than the cooled oil on the downstream side, which is preferable.

  Therefore, in the oil cooler 1 of the first embodiment, it is possible to reduce the size of each constituent member and the number of stacked elements 2 as compared with the conventional product, and it is possible to greatly reduce the overall size and the manufacturing cost. Become.

Next, the effect will be described.
As described above, the heat exchanger according to the first embodiment has the pair of shells 4 and 5 provided with the communication holes 4a and 5a at both ends in the longitudinal direction. 5 are joined to each other to form a passage 2a, and an inner fin 6 accommodated in the element 2 and having opening holes 6a and 6b at positions corresponding to the communication holes 4a and 5a, respectively. In the heat exchanger provided, because the spaces O1 and O2 extending in the width direction between the elements 2 are provided around both the opening holes 6a and 6b of the inner fin 6, the oil flowing along the inner fins 6 in the element 2 is provided. Can be distributed in the width direction to flow substantially uniformly, and the oil flow resistance can be reduced to improve the cooling performance.

  In addition, since the spaces O1 and O2 are provided by notching a part of the inner fin 6, it can be manufactured at a lower cost and easier than when the element 2 is processed.

  In addition, since the outer periphery of the end portion in the longitudinal direction of the inner fin 6 is notched inward to provide the space O1, the oil in the vicinity of the outer periphery of the end portion in the longitudinal direction of the inner fin 6 where oil stagnation tends to occur is reliably circulated. Cooling performance can be improved.

In addition, since a space is provided around the opening hole 6a corresponding to the upstream side of the oil in both the opening holes 6a and 6b of the inner fin 6, the distribution medium can be smoothly dispersed in the width direction in the initial stage of oil distribution. It can be distributed.
In addition, the upstream hot oil is more easily dispersed than the cooled oil on the downstream side, which is preferable.

Example 2 will be described below.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only the differences will be described in detail.
FIG. 9 is a perspective view (partially omitted) showing the inner fin of the second embodiment of the present invention, and FIG. 10 is a diagram for explaining the operation of the second embodiment.

  As shown in FIG. 9, in the oil cooler 1 of the second embodiment, the opening holes 6a and 6b of the inner fin 6 are arranged at positions deviating from the center 21 in the width direction, and from a part of the opening holes 6a and 6b. The difference from the first embodiment is that the openings 6a and 6b are provided with notches 22a and 22b that are notched in the width direction in a direction opposite to the direction in which the openings 6a and 6b are unevenly distributed from the center 21 in the width direction.

  Accordingly, as shown in FIG. 10, in addition to the spaces O1, O2 described in the first embodiment, the openings 6a, 6b of the inner fin 6 are formed between the shells 4, 5 by the notches 22a, 22b. Among the peripheral edges 2b and 2c facing the width direction of the element 2, the openings 6a and 6b are cut out toward the peripheral edge located in the direction opposite to the direction in which the openings 6a and 6b are unevenly distributed from the center 21 in the width direction. Spaces O3 and O4 are formed.

  Therefore, when both the opening holes 6a and 6b of the inner fin 6 are arranged at positions deviating from the center 21 in the width direction, the oil flowing in the passage of the element 2 is more likely to flow unevenly. In the second embodiment, a part of the distribution medium can be uniformly dispersed in the width direction in which the distribution amount is reduced through the spaces O3 and O4, and the oil distributed along the inner fin 6 is distributed substantially uniformly. Can do.

Furthermore, the oil flow resistance can be reduced by the notches 22a and 22b, and the element 2 can be downsized and the core 3 can be downsized.
Note that the lengths of the notches 22a and 22b are determined by the required specifications of heat dissipation performance and distribution resistance.

Example 3 will be described below.
In the third embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted.
FIG. 11 is a perspective view (partially omitted) showing an inner fin according to the third embodiment of the present invention, and FIG. 12 is a diagram for explaining the operation of the third embodiment.

  As shown in FIG. 11, in the oil cooler 1 of the third embodiment, the opening holes 6 a and 6 b of the inner fin 6 are arranged at the center 21 in the width direction, and from a part of the opening holes 6 a and 6 b of the inner fin 6. This embodiment is different from the first embodiment in that cutout portions 33a and 33b cut out in a substantially rectangular shape in the width direction are provided.

  Accordingly, as shown in FIG. 12, in addition to the spaces O1 and O2 described in the first embodiment, the openings 6a and 6b of the inner fin 6 are formed between the shells 4 and 5 by the notches 33a and 33b. Thus, spaces O5 and O6 are formed which are cut out toward the peripheral edges 2b and 2c facing in the width direction of the element 2.

  Therefore, in the third embodiment, a part of the distribution medium can be uniformly dispersed in the width direction in which the distribution amount is reduced through the spaces O5 and O6, and the oil distributed along the inner fin 6 is substantially uniform. It can be distributed.

Furthermore, the oil flow resistance can be reduced by the notches 33a and 33b, and the element 2 can be downsized and the core 3 can be downsized.
Note that the lengths of the notches 33a and 33b are determined by the required specifications of heat dissipation performance and distribution resistance.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
In addition, the heat exchanger is not limited to the water-cooled oil cooler 1 but can be applied to a general heat exchanger such as an air-cooled oil cooler, a condenser, or an intercooler.
Moreover, it can set suitably also about the specific shape, position, formation number, etc. of an opening hole and space.

  Further, in this embodiment, a part of the inner fin 6 is notched to form the spaces O1 to O6. However, a part of the shells 4 and 5 may be bulged outward to form a space similar to the space. it can.

  In the present embodiment, the inner fin 6 is formed in a corrugated plate shape, but the same effect can be obtained by using a so-called offset fin.

  Furthermore, as shown in FIG. 13, the notch 6c described in the first embodiment may be omitted, and a plurality of the notches 22a and 22b (notches 33a and 33b) described in the second and third embodiments may be formed. However, in this case, the oil tends to stagnate in the vicinity of the outer periphery of both ends of the inner fin 6 in the longitudinal direction, which is not preferable.

It is a top view of the oil cooler by which the heat exchanger of Example 1 of the present invention was adopted. It is sectional drawing in the S2-S2 line | wire of FIG. FIG. 2 is an exploded view of an element according to the first embodiment. It is a disassembled perspective view of the element of the first embodiment (a part of the inner fin is omitted). It is sectional drawing in the S5-S5 line | wire of FIG. It is a perspective view of the element of the present Example 1. It is a figure explaining lamination | stacking of the element of the present Example 1. FIG. It is sectional drawing in the S8-S8 line | wire of FIG. 2, and is a figure explaining an effect | action. It is a perspective view (partially abbreviate | omitted) of the inner fin of Example 2 of this invention. It is a figure explaining the effect | action of the present Example 2. FIG. It is a perspective view (partially abbreviate | omitted) of the inner fin of Example 3 of this invention. It is a figure explaining the effect | action of the present Example 3. It is a perspective view (a part is abbreviate | omitted) of the inner fin of the other Example.

Explanation of symbols

O1, O2, O3, O4 Space R1 Inlet side passage R2 Outlet side passage S1 Seat 1 Oil cooler 2 Element 2a Passage 3 Core portion 4, 5 Shell 4a, 5a Communication hole 4b, 5b Annular protrusion 4c, 5c Arc portion 6 Inner Fin 6a, 6b Opening hole 6c Notch 21 Center in width direction 22a, 22b, 33a, 33b Notch

Claims (1)

An element that has a pair of shells provided with communication holes at both longitudinal ends thereof, and the peripheral edges of the pair of shells are joined to each other to form a passage;
In a heat exchanger comprising an inner fin housed in the element and having an opening hole at a position corresponding to each of the communication holes,
A space provided so as to extend in the width direction by notching the outer circumference of the end portion in the longitudinal direction of the inner fin between the shells around at least one of the two opening holes of the inner fin; And a space provided by being cut out from at least one of the peripheral edges of the inner fin facing in the width direction from the opening hole of the inner fin.

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