JPH09217992A - Laminated heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and mechanically recognize the erroneous assembling of a partition plate. SOLUTION: This heat exchanger is provided with a partition plate in the middle part of the direction in which tubes 16 are laminated and respectively independent fluid passages are formed by the tubes 16 on both the sides of the partition plate 13 serving as a boundary. The partition plate 13 is formed by using two plates having bent parts 13b and 13c at their end parts, superposing the two partition plates 13 with the bent parts 13b and 13c opposed to each other so that cavities 14 opened outward are formed at both the end parts of the two partition plates 13. Upon assembly of the heat exchanger, only when the partition plates 13 are located at normal positions, the fitting member of an assembling jig can be fitted into the cavities 14. Thus, the erroneous assembling of the partition plates can be simply decided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger in which a pair of metal plates formed in a dish shape are stacked to form a tube for a fluid passage, and the tubes are laminated in multiple stages. The present invention relates to a heat exchanger in which a partition plate for blocking a fluid passage of a tube is provided in the middle of a tube stacking direction, and independent fluid passages are formed on both sides of the partition plate. It is suitable as an oil cooler.

[0002]

2. Description of the Related Art A conventional laminated heat exchanger of this type is described in Japanese Utility Model Laid-Open No. 62-198373, and a partition plate in this conventional laminated heat exchanger has a shape as shown in FIG. The partition plate 13A has a shape in which the communication holes 15e of the bowl-shaped projections 15c formed at both ends of the metal plate 15 for tube construction shown in FIG. 2 are eliminated.

[0003]

With such a shape, the partition plate 13A and the metal plate 15 differ only in the presence or absence of the communication hole 15e. Therefore, when the heat exchanger is assembled, the partition plate 13A and the metal plate 15 are different from each other. Plate 13A and metal plate 15
The problem of erroneously assembling and is likely to occur.

If this incorrect assembly occurs, the fluid passage cannot be partitioned at the proper position, which is a fatal defect that the heat exchange function as designed cannot be exhibited. Further, after the heat exchanger is assembled, the communication hole 15 is exposed from the outside of the heat exchanger.
Since the presence or absence of e cannot be visually inspected, it is impossible for the operator to visually confirm the erroneous assembly of the partition plate 13A and the metal plate 15.

In view of the above points, the present invention makes it possible to reliably and mechanically confirm the erroneous assembly of a partition plate in a normal assembly process without adding a special inspection process. With the goal.

[0006]

In order to achieve the above object, the present invention employs the following technical means. That is, in the invention described in claims 1 to 4, the partition plate (13) is arranged midway in the stacking direction of the tubes (16), and the tubes on both sides of the partition plate (13) are defined with the partition plate (13) as a boundary. In the laminated heat exchanger in which independent fluid passages are formed in (16), a partition plate (13) having a bent portion (13b) at least at one end in the longitudinal direction is used. Two partition plates (13)
Of the two partition plates (13) are overlapped with each other so that their bent portions (13b) face in opposite directions, thereby forming a void (14) opening outward at least at one end. Is characterized by.

According to this structure, when the heat exchanger is assembled, the fitting member (31) which can be fitted into the space (14) only when the partition plate (13) is in the normal position.
By providing a) in the assembling jig (31), it is possible to easily determine the erroneous assembling of the partition plate depending on whether or not the fitting member (31a) can be fitted into the space (14). .

Therefore, it is possible to surely check the erroneous assembly of the partition plate mechanically in the normal assembly process without adding a special inspection process, so that the assembly man-hour is not increased. It is possible to reliably prevent a fatal defect such as a wrong assembly of the partition plate. In the invention according to claim 4,
Metal plate (15) and partition plate (13)
Of the metal plate (15) and the partition plate (1
3) are integrally joined, and when the two partition plates (13) are overlapped with each other, the cutout portions (13d to 13k, 13d 'to 1) are formed at the outer edge portions of each other.
3j ') and the flat surface portion (13a) are overlapped with each other, and the notch-shaped portions (13d to 13k, 13d' to 13j ') are formed on the outer edge portions of the two partition plates (13), respectively. There is.

As a result, the cutout portions (13d to 13d) are formed.
k, 13d 'to 13j'), it is possible to promote the Mg in the brazing material to try to scatter (evaporate) in the vacuum atmosphere, so that the gettering action of Mg (the action of removing the oxide film on the aluminum surface by Mg) is excellent. Can be demonstrated. Moreover, the cutout-shaped portions (13d to 13k, 1) are formed on the end faces of the outer edge portions of the two partition plates (13, 13).
Since it is possible to form a bent joint shape by 3d 'to 13j'), it becomes easier to form a fillet (wax pool) by this bent joint shape portion. .

As a result, the plane portion (13
Brazing between the two partition plates 13 having a) can be favorably performed, and defective brazing can be suppressed. Further, after brazing, the cutout shape portion (1
It is also possible to easily confirm the brazing property through 3d to 13k and 13d 'to 13j'.

Note that the reference numerals in parentheses attached to the respective means and the means described in the claims indicate the correspondence with the specific means described in the embodiments described later.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 6 show a first embodiment in which the heat exchanger of the present invention is applied to an oil cooler for an automobile, and in FIG. The 1st heat exchange part 11 cools the oil (1st fluid) A of an automobile engine, for example, and the 2nd heat exchange part 12 divided into the lower part of the oil cooler 10 is
For example, an automatic transmission operating oil for an automobile engine (second
The fluid B is cooled, and the oil A and the oil B may be exchanged.

The heat exchanging parts 11 and 12 are partitioned by a partition part which is a combination of two partition plates 13 and 13. The oil cooler 10 performs heat exchange between the cooling air (outside air) blown in the direction perpendicular to the paper surface of FIG. 1 and the oils A and B flowing through the heat exchanging portions 11 and 12, respectively. Cool B.

The oil passages of the two heat exchanging parts 11 and 12 are formed by a laminated structure of metal plates, and the specific structure thereof may be basically the same as a known one. Therefore, the outline of the laminated structure will be described below. Explaining, both heat exchange parts 11,
In FIG. 12, a tube 16 is formed by stacking a pair of metal plates 15, 15. Although not shown in the drawings, an inner fin formed into a predetermined shape by an A3000 series aluminum bare material is incorporated in the tube 16 to improve the heat transfer coefficient on the oil side.

As shown in the enlarged view of FIG. 2, the metal plate 15 is formed in a dish shape having a concave portion 15a extending in the longitudinal direction, and the bowl-shaped protrusions 1 are provided at both ends of the concave portion 15a.
5b and 15c are formed, and the bowl-shaped protrusions 15b and 15
It has a shape in which communication holes 15d and 15e are opened at the top of c. Then, the tube 16 is formed by stacking the pair of metal plates 15 and 15 so that the concave portions 15a and the bowl-shaped protruding portions 15b and 15c thereof face in opposite directions.

As the material of the metal plate 15, specifically, a double-sided clad material (plate thickness: about 1 mm) in which a brazing material (A4000 series material) is clad on both sides of an aluminum core material (A3000 series material) is used. A large number of tubes 16 are formed in parallel by forming them into a dish shape, laminating a large number of these two sets, and then joining them by brazing.

The passages of the large number of tubes 16 communicate with each other at their both ends (left and right ends in FIG. 1).
d and 15e communicate with each other, whereby oil A flows as indicated by arrow a and oil B flows as indicated by arrow b. In addition, in both heat exchange sections 11 and 12, corrugated fins (fin means) 17 are joined to the gaps between the outer surfaces of adjacent tubes 16 to increase the heat transfer area on the air side. The corrugated fin 17 is formed in a corrugated shape from an aluminum bare material such as A3003 which is not clad with a brazing material.

The end plate 18 located at the upper end of the first heat exchanging portion 11 in the laminating direction of the thin metal plates, and the second heat exchanging portion 12
The end plate 19 and the partition plate 13 located at the lower end of the metal thin plates in the laminating direction are also the metal plate 1
It is molded from double-sided clad material as in 5, but
These plates 13, 18 and 19 are for securing strength,
It is thicker than the metal plate 15, for example, about 2 mm.

Fitting holes 18a and 18b are formed at both ends of the upper end plate 18, and
The inlet joint 20 on the engine oil A side is fitted and joined to a, and the outlet joint 21 is fitted and joined to the fitting hole 18b. Further, fitting holes 19a and 19b are formed at both ends of the end plate 19 at the lower end, and
An outlet joint 22 on the transmission oil B side is fitted and joined to 9a, and an inlet joint 23 is fitted and joined to the fitting hole 19b. In addition, each joint 20-23 is A
It is formed by cutting a 7000 series aluminum bare material.

On the other hand, the partition plates 13 and 1 of the partition section
3 has a unique shape according to the present invention, and in the first embodiment, as shown in FIG. 3, it has a flat surface portion 13a formed at the central portion in the plate longitudinal direction.
Cup-shaped bent portions 13b and 13c are formed at both ends of a. The cup-shaped bent portions 13b and 13c
Is formed with a width dimension smaller than the width of the partition plate 13 in this example.

Here, the bent portions 13b and 13c are shown in FIG.
As can be understood from the X part of the above, the metal plate 15 comes into contact with the outer side surfaces of the tops of the bowl-shaped protrusions 15b and 15c at both ends,
Since the communication holes 15d and 15e are closed by being joined, the communication holes 15d and 15e are designed to have an area and a bending height that allow the communication holes 15d and 15e to be closed.

Further, the partition plates 13, 13 have a space 14 between the bent portions 13b, 13c (see FIG. 1).
In addition, the void portion 14 is opened outward so that the fitting member of the assembling jig used in the heat exchanger assembling step described later can be fitted therein. That is, since the partition plates 13 and 13 open the void portion 14 to the outside, the cup-shaped bent portion 1 is formed without forming the bowl-shaped protruding portions at both ends of the flat surface portion 13a.
3b and 13c are formed. Next, a method of manufacturing the oil cooler of the present embodiment having the above-described configuration will be described. FIG. 4 shows an assembling jig for assembling the heat exchanger, and the assembling jig is a lower jig 30. It is composed of side surface jigs 31 and 31 slidable in the left-right direction C and an upper surface jig 33 slidable in the up-down direction D.

Each member of the oil cooler 10 shown in FIG. 1 is laminated on the lower jig 30 of the assembling jig and temporarily assembled in the state shown in FIG. Next, the side surface jigs 31, 31 are pressed against the side surface of the temporary assembly 10 'from the left-right direction C thereof. At this time, the side jigs 31, 31 each have a fitting member 31a projecting toward the temporary assembly 10 'side at a predetermined height (that is, at a regular position of the partition plates 13, 13 in the oil cooler 10). Since it is provided at a height (corresponding height), the partition plates 13 and 1 in the temporary assembly 10 'are
3 is assembled in the normal position, the side jig 3
The fitting members 31a of Nos. 1 and 31 are the gaps 14 between the bent portions 13b and 13c of the partition plates 13 and 13, respectively.
It can fit inside. In addition, 13 'of FIG. 4 shows an assembling position of the partition plates 13 and 13.

Therefore, the side jigs 31, 31 are pressed against the side surface of the temporary assembly 10 'from the left-right direction C thereof so that the many plates 13, 15, 18, 19 of the temporary assembly 10' are mutually attached. It is possible to correct the displacement of the stacking position and hold the temporary assembly 10 'in the left-right direction by the side jigs 31, 31 with the plates aligned. FIG. 5 shows a state in which the partition plates 13 and 13 are assembled at regular positions, and the fitting members 31 a of the side jigs 31 and 31 can be fitted into the voids 14 of the partition plates 13 and 13.

Contrary to this, when the partition plates 13 and 13 are not assembled in the regular position in the temporary assembly 10 ', but the metal plate 15 is assembled in the assembly position of the partition plates 13 and 13. As shown in FIG.
The fitting members 31a of the side jigs 31, 31 come into contact with and interfere with the bowl-shaped protrusions 15b, 15c of the metal plate 15, respectively, so that the side jigs 31, 31 contact the side surfaces of the temporary assembly 10 '. You cannot move forward to the contact position. This makes it possible to easily find that the partition plates 13, 13 and the metal plate 15 are erroneously assembled. When this erroneous assembly is found, the temporary assembly 10 'is reassembled and the partition plates 13, 13 are assembled in the regular positions.

Next, the upper surface jig 33 is pressed against the upper surface of the temporary assembly 10 ', and the vertical direction of the temporary assembly 10' is held by the lower jig 30 and the upper surface jig 33. The temporarily assembled body 10 ′ which has been properly assembled is carried into a brazing furnace (vacuum brazing furnace) while maintaining the assembled state by the jigs 30 to 33, where each plate 13 is , 15, 1
The brazing filler metals clad on both sides of Nos. 8 and 19 are heated to the melting point to melt the brazing filler metal, and the respective joints are vacuum brazed together.

As can be understood from the above description, the first
According to the embodiment, in the process of manufacturing the heat exchanger, the holding operation of the side jigs 31, 31 is performed in the process of holding the temporary assembly 10 'by the assembly jig without adding a special inspection process or the like. Partition plates 13, 1 can be used as they are
The presence / absence of wrong assembly of item 3 can be easily and reliably confirmed mechanically.

The operation of the oil cooler 10 will be briefly described. The engine oil A flows from the inlet joint 20 into the bowl-shaped protrusion 15b of the metal plate 15 and is distributed to the tubes 16 there. , Each tube 1
6 in parallel. At this time, the engine oil A is supplied to the inner fins (not shown) in the tube 16 and the tube 1
6 and the corrugated fins 17 to exchange heat with the cooling air for cooling. The cooled oil A flows into the bowl-shaped protrusion 15c of the metal plate 15, is gathered there, and flows out from the outlet joint 21 to the outside.

On the other hand, the transmission oil B flows from the inlet joint 23 into the bowl-shaped projecting portion 15c of the metal plate 15, and is distributed to each tube 16 there, and each tube 16
Flow in parallel. At this time, the transmission oil B is cooled by exchanging heat with the cooling air via the inner fins (not shown) in the tubes 16, the tubes 16 and the corrugated fins 17. The oil B after cooling flows into the bowl-shaped protrusion 15b of the metal plate 15 and is collected here,
It flows out from the outlet joint 22. (Second Embodiment) FIG. 7 is a second embodiment in which the shapes of the bent portions 13b and 13c of the partition plates 13 and 13 are slightly changed. In this example, the flat portions 13a and the bent portions 13b of the partition plates 13 and 13 are shown. , 13c have the same width, and the bent portions 13b, 13c are not cup-shaped,
It has a simple bent shape. (Third Embodiment) The third embodiment is a partition plate 13,
It is intended to improve the brazability in the 13th part,
In the partition plates 13 and 13, since the flat portions 13a having a relatively large area are brought into contact with each other to be joined, the following 2
Brazing failure may occur for one reason.

That is, first, since the flat portions 13a are in contact with each other over a wide area, the Mg contained in the brazing material is prevented from scattering (evaporating) in the vacuum atmosphere. As a result, the gettering action of Mg (the action of Mg to remove the oxide film on the surface of the aluminum) is not sufficiently exerted, which may cause brazing failure. Secondly, since the end faces of the partition plates 13 and 13 have a simple linear plane shape with respect to each other, it becomes difficult to form a fillet (wax pool) on the end faces of the outer edges, and as a result,
On the end face of the outer edge portion, a phenomenon of lack of brazing filler metal (wax sink) may occur, resulting in brazing failure.

Therefore, in the third embodiment, in order to suppress the occurrence of the brazing failure, the partition plates 13 and 1 are used.
The shape of 3 is devised as shown in FIG. In FIG. 8, the flat surface portion 13a is a portion that is abutted and brazed to the other flat surface portion 13a, and in the third embodiment, one end of the partition plate 13 in the longitudinal direction has an outer edge portion end surface. A plurality of (4 in the illustrated example) notched grooves 13d to 13g are provided at an equal pitch (a ≠ b ≠ c). Similarly, a plurality of (4 in the illustrated example) notch grooves 13h to 13k are provided at the unequal pitch (a ≠ b ≠ c) on the outer edge portion end surface on the other side in the longitudinal direction of the partition plate 13 as well. is there.

Here, the notch grooves 13d to 13g and the notch grooves 13h to 13k are the center points O of the partition plate 13.
Position rotated by 180 ° with respect to (position of point symmetry)
It is provided in. With such a positional relationship, the cutout grooves 13d to 13d are formed on both end surfaces of the partition plate 13 in the longitudinal direction.
By forming 13k, two partition plates 1
When 3 and 13 are superposed, one of the partition plates 13
The cutout grooves 13d to 13k of the cutout groove 13d to 13k always overlap the flat surface portion 13a of the other partition plate 13.
3d to 13k do not overlap each other.

As a result, during brazing of the heat exchanger, the Mg in the brazing material is passed through the cutout grooves 13d to 13k.
Can be promoted to scatter (evaporate) in the vacuum atmosphere, so that the gettering action of Mg (the action of removing the oxide film on the aluminum surface by Mg) can be exhibited well. Further, since a bent joint shape can be formed on the end faces of the outer edge portions of the two partition plates 13 by the notched grooves 13d to 13k, a fillet (wax pool) is formed in the bent joint shape portion. It will be easier.

As a result, the flat part (13
Brazing between the two partition plates 13 having a) can be favorably performed, and defective brazing can be suppressed. (Fourth Embodiment) The fourth embodiment shown in FIG.
Instead of the cutout grooves 13d to 13k in the embodiment,
The holes 13d 'to 13j' are provided, and the positional relationship of the holes 13d 'to 13j' is the same as that of the cutout grooves 13d to 13k.

Therefore, the two partition plates 13, 13
When the partition plates are superposed, no matter what direction the partition plates are, the hole 1 of one partition plate 13
3d 'to 13j' always overlap the flat surface portion 13a of the other partition plate 13. (Fifth Embodiment) A fifth embodiment shown in FIG. 10 is designed to prevent water from accumulating in the cup-shaped bent portions 13b and 13c of the partition plate 13.

Although FIG. 1 shows a state in which the partition plate 13 is arranged in the horizontal direction, the partition plate 13
There is a case where the oil cooler 10 is mounted on a vehicle with the cup-shaped bent portion 13b on the upper end side of the partition plate 13.
A situation may occur in which water is stored in (13c), and this water storage may reduce the corrosion resistance of the partition plate 13.

Therefore, in the fifth embodiment, the concave groove portion 1 which partially overlaps with the cup-shaped bent portions 13b and 13c is formed at a portion of the cup-shaped bent portions 13b and 13c on the plane portion 13a side.
3m and 13n are provided, and the concave groove portions 13m and 13n are provided with a drainage port function for discharging water that has flowed into the cup-shaped bent portions 13b and 13c. Accordingly, when the oil cooler 10 is mounted on a vehicle with the partition plate 13 oriented vertically, the cup-shaped bent portion 13 on the upper end side of the partition plate 13 is mounted.
Even if water flows into the b (13c), this water is
(Or 13n) can be discharged well. (Other Embodiments) In the above embodiment, the case where the present invention is applied to the oil cooler for automobiles has been described, but the present invention is not limited to the oil cooler, and a heat exchanger for exchanging heat of various fluids. Of course, it can be widely applied to.

Further, the bent portions 13b and 13c are formed at both ends of the partition plates 13 and 13 and the voids 14 are formed at both ends, but only one end of the partition plates 13 and 13 is formed. Alternatively, the bent portions 13b and 13c may be formed to form the void portion 14 only at one end portion of the partition plates 13 and 13. In this case, naturally, the fitting member 31a is provided on only one of the left and right side jigs 31, 31.

Further, in the third embodiment shown in FIG. 8, only the cutout grooves 13d to 13k are provided, and in the fourth embodiment shown in FIG. 9, only the holes 13d 'to 13j' are provided.
The cutout grooves 13d to 13k and the holes 13d 'to 13
You may use together with j '. For example, the partition plate 13
Of the outer edge of one side in the longitudinal direction of the unequal pitch (a ≠ b
≠ c), a plurality of notched grooves are provided, and the end face of the outer edge of the partition plate 13 on the other side in the longitudinal direction has an unequal pitch (a
It is also possible to provide a plurality of holes with ≠ b ≠ c).

[Brief description of drawings]

FIG. 1 is a front sectional view of an oil cooler showing a first embodiment of the present invention.

2A is a partial plan view of the metal plate for tube construction in FIG. 1, and FIG. 2B is a sectional view taken along line AA of FIG.

3A is a partial plan view of the partition plate in FIG. 1, FIG. 3B is a sectional view taken along line BB of FIG. 3A, and FIG. 3C is a partial perspective view of the partition plate.

FIG. 4 is a perspective view showing an assembly jig for an oil cooler in the first embodiment.

FIG. 5 is an explanatory diagram showing a positional relationship with an assembling jig when the partition plate is assembled at a regular position in the first embodiment.

FIG. 6 is an explanatory diagram showing a positional relationship with an assembling jig when a partition plate is erroneously assembled in the first embodiment.

FIG. 7 is a partial perspective view of a partition plate showing a second embodiment of the present invention.

FIG. 8 is a perspective view of a partition plate showing a third embodiment of the present invention.

FIG. 9 is a perspective view of a partition plate showing a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a partition plate showing a fifth embodiment of the present invention.

11A is a partial plan view of a partition plate in a conventional oil cooler, and FIG. 11B is a sectional view taken along line EE of FIG.

[Explanation of symbols]

10 ... Oil cooler, 11 ... 1st heat exchange part, 12 ... 2nd heat exchange part, 13 ... Partition plate, 13a ... Flat part,
13b, 13c ... Bent portion, 13d-13k ... Notched groove, 13d'-13j '... Hole portion, 14 ... Void portion, 15 ...
Metal plate, 15a ... Recessed portion, 15b, 15c ... Bowl-shaped protruding portion, 15d, 15e ... Communication hole, 16 ... Tube, 30
32 ... Assembly jig, 31a ... Fitting member.

Claims (5)

[Claims] 1. A metal plate (15) formed in a dish shape having a concave portion (15a) extending in the longitudinal direction, and bowl-shaped protrusions (15) at both ends of the concave portion (15a).
b, 15c) are formed, and the bowl-shaped protrusions (15b, 1c) are formed.
Communication holes (15d, 15e) are provided at the top of 5c), and two concave portions (15a) and bowl-shaped protrusions (15b, 15c) of the metal plates (15) are directed in opposite directions. The tubes (16) are formed by stacking the tubes in this manner, and the tubes (16) are stacked in multiple layers in the thickness direction thereof, and the communication holes (15d, 15e) are provided in the middle of the tube (16) stacking direction. And a partition plate (13) that closes the partition plate is provided, and with the partition plate (13) as a boundary, the tubes (16) on both sides of the partition plate (13) form independent fluid passages. In the heat exchanger, two partition plates (13) each having a bent portion (13b) at least at one end in the longitudinal direction are used. The two partition plates (13) were overlapped so that their bent portions (13b) faced in opposite directions, so that at least one end of the two partition plates (13) was opened outward. A laminated heat exchanger having a void portion (14) formed therein. 2. The bent portion (13b) is formed in a cup shape with a width dimension smaller than the width of the partition plate (13) at least at one end of the partition plate (13). Item 1. The laminated heat exchanger according to item 1. 3. The bent portion (13b) is formed with the same width dimension as the width of the partition plate (13) at least at one end of the partition plate (13). The laminated heat exchanger described. 4. The metal plate (15) and the partition plate (13) are made of a material in which a brazing material is clad, and the metal plate (15) and the partition plate (13) are integrated by brazing. When the two partition plates (13) are overlapped with each other, the notch-shaped portions (13d to 1d) are formed at the outer edge portions of each other.
3k, 13d 'to 13j') and the flat surface portion (13a) are overlapped with each other, the cutout-shaped portions (13d to 13k, 13d ') are provided on the outer edge portions of the two partition plates (13), respectively.
13j ') are formed. The laminated heat exchanger according to claim 1, wherein 5. The manufacturing method for manufacturing the laminated heat exchanger according to claim 1, wherein the partition plate (13) is provided at a regular position in the stacking direction of the tubes (16). ) Is assembled, the fitting member (3) configured to be fitted into the space (14).
1a) having a side jig (31), and using this side jig (31), the tube (16)
(10 ') a temporary assembly with the partition plate (13)
Of the laminated body, wherein the temporary assembly (10 ') is brought into the brazing furnace and the temporary assembly (10') is integrally brazed. Heat exchanger manufacturing method.