JP2004270972A - Lamination type heat exchanger and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamination type heat exchanger capable of sufficiently improving its quality and reliability in practical use and to provide its manufacturing method. <P>SOLUTION: This lamination type heat exchanger 1 has a heat exchange part 2 constituted by laminating a plurality of plates 41 to 46 and a plurality of spacers 6a to 6b alternately and a pair of tanks 11 provided in its end parts. Each tank 11 is formed to be larger than outside dimension of the heat exchange part 2, and an inclined part 11a directed toward the outside in the direction of lamination of the heat exchange part 2 is provided in an inner side end part opposing to the heat exchange part 2. This lamination type heat exchanger 1 is constituted by assembling the heat exchange part 2 temporarily by laminating the plurality of plates 41 to 46 and the plurality of spacers 6a to 6b through a brazing material alternately and sequentially, arranging each tank 11 in the end part of the temporarily assembled heat exchange part 2 through a brazing material, and then brazing the temporarily assembled heat exchange part 2 and each tank 11 integrally by pressing each tank 11 in the direction in which each tank is drawn close and mutually for manufacture. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a laminated heat exchanger in which a core as a heat exchange section is of a laminated type and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, as this type of stacked heat exchanger, for example, the one described in Patent Document 1 as shown in FIGS. 5 and 6 is known. The laminated heat exchanger 1 is configured by attaching a pair of tanks 3a, 3b to both ends of the central core 2 in the left-right direction (the direction of arrow a) by welding or the like.
[0003]
The core 2 includes a plurality of (in this case, six) plates 41, 42, 43, 44, 45, and 46, and ends of the plates 41 to 46 (for example, between the plates 41 and 42, before and after the core 2). Bars 6a and 6b as a plurality of (two in this case, two for each layer) spacers provided at both ends in the direction (arrow b direction) and at both ends in the left and right direction of the core 2 between the plates 42 and 43. Are alternately stacked.
[0004]
Corrugated fins 5a, 5b are interposed between the bars 6a, 6a and 6b, 6b between the plates 41 to 46, respectively. Incidentally, reference numeral 7 in the figure denotes a medium outlet pipe and a medium inflow pipe provided at the lower part of the tank 3a and the upper part of the tank 3b.
[0005]
By the way, in such a laminated heat exchanger 1, the welding of the tanks 3a and 3b was originally performed after the brazing of the core 2, so that the brazing portion of the core 2 was affected by the welding. There was a problem that melting, peeling, material deterioration, etc. occurred.
[0006]
In order to solve such a problem, in the manufacturing method of the stacked heat exchanger of Patent Document 1 described above, first, each component (that is, the plates 41 to 46, the fins 5a and 5b, and the bars 6a and 6b) constituting the core 2 is provided. These are temporarily assembled in the form of a core 2 with a plate-shaped brazing material interposed therebetween, and tanks 3a and 3b are welded to both ends of the temporarily assembled core 2 in the left-right direction by welding or the like. After joining, the temporary core 2 in which the tanks 3a and 3b are joined is brazed to be manufactured.
[0007]
Therefore, in the technique of Patent Document 1, the welding of the tanks 3a and 3b is performed before the brazing of the core 2, so that the brazing portion of the core 2 is affected by the welding to cause re-melting, peeling or material deterioration. The stacked heat exchanger 1 is formed by a manufacturing method that does not occur.
[0008]
[Patent Document 1]
JP-A-6-3076
[Problems to be solved by the invention]
However, in the technique of Patent Document 1, since the core 2 and the tanks 3a and 3b are joined by welding and then the core 2 is formed by brazing, the brazing material interposed between the components of the core 2 is used. 8 could be melted by brazing and cause dimensional changes such as shrinkage of the core 2 as a whole.
[0010]
In this case, since it is difficult to absorb the dimensional change in the joint between the core 2 and the tanks 3a and 3b, it is still insufficient to cause poor joining in which unjoined portions such as gaps and peeling occur in the joined portion. There was a problem.
[0011]
If a gap or separation occurs at the joint between the core 2 and the tanks 3a and 3b, leakage of the heat exchange medium flowing through the laminated heat exchanger 1 occurs, and the heat exchange medium May cause damage to the laminated heat exchanger 1 and may significantly reduce quality and reliability.
[0012]
Therefore, the present invention has been made in view of the above-described problems, and it is possible to reliably prevent the heat exchange medium from leaking, and to prevent the damage caused by this leak beforehand, thereby improving the quality and reliability. An object of the present invention is to provide a laminated heat exchanger that can be sufficiently improved in practical use and a method for manufacturing the same.
[0013]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a stacked heat exchanger including a heat exchange unit formed by alternately stacking a plurality of plates and a plurality of spacers, and a pair of tanks provided at ends of the heat exchange unit. The pair of tanks is formed to be larger than the outer dimension of the heat exchange unit, and the inner end of the pair of tanks facing the heat exchange unit is provided with an inclined portion facing outward in the stacking direction of the heat exchange unit. I made it.
[0014]
According to a second aspect, a contact portion having an inclination corresponding to the inclined portion is provided at an end of an outermost layer of the heat exchange portion facing the pair of tanks.
[0015]
According to the third aspect, a temporary assembling step in which a plurality of plates and a plurality of spacers are alternately stacked with a brazing material interposed therebetween to temporarily assemble the heat exchange portion, and an end portion of the temporarily assembled heat exchange portion. A tank disposing step of disposing a pair of tanks via a brazing material, and a brazing step of brazing the temporarily assembled heat exchanging part and the pair of tanks together, wherein the pair of tanks is a heat exchanging part. The outer end of the heat exchange unit is formed with an inclined portion facing outward in the stacking direction of the heat exchange unit, and the pair of tanks is attracted to each other during the brazing process. Direction.
[0016]
According to a fourth aspect of the present invention, a contact portion having an inclination corresponding to the inclined portion is provided at an end of the outermost layer of the heat exchange portion facing the pair of tanks.
[0017]
【The invention's effect】
According to the first aspect, the pair of tanks is formed to be larger than the outer dimension of the heat exchanging section, and the pair of tanks is formed on the inner end of the pair of tanks facing the heat exchanging section toward the outside in the stacking direction of the heat exchanging section. By providing the inclined portion, the dimensional change that may occur in the heat exchange portion during brazing can be absorbed by the inclined portion.
[0018]
Moreover, since the heat exchange section and each tank can be integrally brazed, unjoined portions such as gaps and separation between the components of the heat exchange section and between the heat exchange section and each tank are generated. Since these can be reliably brazed without causing the leakage, the leakage of the heat exchange medium can be reliably prevented, and the damage caused by the leakage can be avoided. Thus, it is possible to provide a laminated heat exchanger capable of sufficiently improving the quality and reliability in practical use.
[0019]
According to the second aspect, in the stacked heat exchanger according to the first aspect, a contact portion having an inclination corresponding to the inclined portion is provided at an outermost layer end portion of the heat exchange portion facing the pair of tanks. By doing so, the contact portion between the heat exchange section and each tank can be brought into close contact, and the bondability between the heat exchange section and each tank can be further improved, so that the brazing reliability can be improved. Sex can be significantly improved.
[0020]
According to the third aspect, the pair of tanks is formed to be larger than the outer dimension of the heat exchange section, and the inner ends of the pair of tanks facing the heat exchange section are directed outward in the stacking direction of the heat exchange section. By providing the inclined portion, the dimensional change that may occur in the heat exchange portion during brazing can be absorbed by the inclined portion.
[0021]
Moreover, since the heat exchange section and each tank can be integrally brazed, unjoined portions such as gaps and separation between the components of the heat exchange section and between the heat exchange section and each tank are generated. Since these can be reliably brazed without causing the leakage, the leakage of the heat exchange medium can be reliably prevented, and the damage caused by the leakage can be avoided. Thus, it is possible to provide a method of manufacturing a laminated heat exchanger that can sufficiently improve quality and reliability in practical use.
[0022]
Further, since the heat exchange unit and each tank can be integrally brazed in this manner, a step of joining these heat exchange units and each tank by a method such as welding can be omitted, and each tank can be brazed. Since the heat-exchange portion temporarily assembled by the inclined portion can be pressed down in the stacking direction, it is not necessary to provide a jig for holding down the heat-exchange portion temporarily assembled, so that the manufacturing cost can be reduced.
[0023]
According to a fourth aspect, in the method for manufacturing a laminated heat exchanger according to the third aspect, the outermost layer end of the heat exchange portion facing the pair of tanks has an inclination corresponding to the inclined portion. By providing the parts, the contact parts between the heat exchange part and each tank can be brought into close contact with each other, and the bondability between these heat exchange parts and each tank can be further improved. The reliability of the attachment can be greatly improved.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0025]
1 to 3 show an embodiment of a heat exchanger according to the present invention. FIG. 1 is a perspective view showing a schematic configuration of a laminated heat exchanger according to the embodiment. FIG. 2 is a heat exchanger shown in FIG. 3 is an exploded perspective view showing an enlarged main part in FIG. 3, and FIG. 3 is a cross-sectional view showing an AA cross section in the heat exchanger of FIG.
[0026]
In FIG. 1 in which the same reference numerals are given to the corresponding parts as in FIG. 5, reference numeral 10 denotes the laminated heat exchanger according to the present embodiment, which is provided at both ends of the core 2 as a heat exchange part in the left-right direction (the direction of arrow a). The configuration is substantially the same as that of the above-described stacked heat exchanger 1 except that the shapes of the pair of tanks 11 and 11 are different, and that the method of joining the core 2 and each of the tanks 11 and 11 is different.
[0027]
That is, the laminated heat exchanger 10 is configured by attaching a pair of tanks 11 to both ends of the central core 2 in the left-right direction (the direction of arrow a).
[0028]
As shown in FIG. 2, for example, the core 2 includes a plurality of (in this case, six) plates 41, 42, 43, 44, 45, and 46, and ends of the plates 41 to 46 (for example, the plate 41). , 42, and at both ends of the core 2 in the front-rear direction (the direction of the arrow b), and between the plates 42, 43, both ends of the core 2 in the left-right direction (in this case, two for each layer). ) Are alternately stacked with bars 6a and 6b as spacers. Corrugated fins 5a, 5b are interposed between the bars 6a, 6a and 6b, 6b between the plates 41 to 46, respectively.
[0029]
At this time, the layer between the uppermost plate 41 and the next plate (that is, the second plate from the top) is closed at both ends in the front-rear direction (arrow b direction) by bars 6a, 6a. Each waveform of the fins 5a interposed between the bars 6a, 6a extends in the left-right direction, and this layer communicates with the tanks 11 on both left and right sides, respectively. The layers between the plates 43 and 44 and the layers between the plates 45 and 46 are similarly configured, and these layers are hereinafter referred to as odd-numbered layers.
[0030]
On the other hand, the layer between the second-stage plate 42 and the third-stage plate 43 has both ends in the left-right direction closed by bars 6b, 6b, and is interposed between the bars 6b, 6b. Each wave of the fin 5b extends in the front-rear direction, and this layer communicates with the outside on both front and rear sides. The layers between the plates 44 and 45 are similarly configured, and these layers are hereinafter referred to as even-numbered layers.
[0031]
As described above, in the laminated heat exchanger 10, the combination of the bars 6a and the fins 5a and the combination of the bars 6b and the fins 5b are alternately arranged. That is, the plates 41 to 46, the fins 5a and 5b, and the bars 6a and 6b are stacked on each other via the brazing material 8, and are brazed at their respective contact portions.
[0032]
At the lower and upper portions of the tanks 11, 11, pipes 7, 7 for medium outlet and medium inflow are provided, and the heat exchange medium, for example, the refrigerant flowing from the medium inflow pipe 7 into the tank 11 is a fin. The fluid reaches the opposing tank 11 through the odd layer provided with 5a, and flows out from the medium outlet pipe 7.
[0033]
On the other hand, another heat exchange medium, for example, air flows through the even-numbered layer provided with the fins 5b, and heat is sequentially transferred between the two heat exchange media flowing orthogonally through the fins 5a and 5b and the plates 41 to 46. An exchange has been made to take place.
[0034]
Here, in the present embodiment, the pair of tanks 11, 11 has a substantially trapezoidal shape larger than the outer dimension of the core 2, and as shown in FIG. And a contact portion 9 where each of the tanks 11 and 11 comes into contact with each other, has an inclined portion 11a directed outward in the stacking direction of the core 2.
[0035]
Now, such a laminated heat exchanger 10 is manufactured based on the following procedure.
[0036]
That is, as shown in FIG. 2, the laminated heat exchanger 10 alternately laminates a plurality of plates 41 to 46 and a plurality of spacers 6 a and 6 b alternately with the brazing material 8 interposed therebetween in a temporary assembly process. Then, as shown in FIG. 3, in the tank disposing step, a pair of tanks 11, 11 are attached to both ends of the temporarily assembled core 2 via the brazing material 8, as shown in FIG. 3. Deploy.
[0037]
In this state, in the subsequent brazing step, these cores 2 and the tanks 11 and 11 are brazed together while pressing the tanks 11 and 11 in a direction of drawing toward each other. A laminated heat exchanger 10 as shown is formed.
[0038]
As described above, in the present embodiment, the pair of tanks 11, 11 is formed to be larger than the outer dimension of the core 2, and the inner ends of the tanks 11, 11 facing the core 2 are stacked in the stacking direction of the core 2. By providing the outwardly inclined portion 11a, the inclined portion 11a can absorb a dimensional change that may occur in the core 2 during brazing.
[0039]
Moreover, since the core 2 and the tanks 11 and 11 can be integrally brazed, the components of the core 2 (the plates 41 to 46, the fins 5a and 5b, and the bars 6a and 6b) and the core 2 These can be reliably brazed without causing a joining failure in which unjoining such as a gap or separation occurs between the tanks 11 and 11.
[0040]
Therefore, it is possible to reliably prevent the heat exchange medium from leaking, and to avoid damage caused by the leak beforehand, so that the quality and reliability can be sufficiently improved in practical use.
[0041]
Further, since the core 2 and the tanks 11 and 11 can be integrally brazed in this manner, a step of joining the core 2 and the tanks 11 and 11 by a method such as welding can be omitted. Since the cores 2 temporarily assembled by the inclined portions 11a of the tanks 11 and 11 can be pressed down in the stacking direction, there is no need to provide a jig for pressing down the cores 2 temporarily assembled, thereby reducing the manufacturing cost. can do.
[0042]
Although the heat exchanger 10 of the present invention has been described by taking the above-described embodiment as an example, the present invention is not limited to this, and various embodiments can be adopted without departing from the gist of the present invention. .
[0043]
For example, in the above-described embodiment, the core 2 has a substantially trapezoidal shape larger than the outer dimension of the core 2, and has an inclined portion 11 a facing outward in the stacking direction of the core 2 at an inner end facing the core 2. Although the stacked heat exchanger 10 provided with the tank 11 described above has been described, the present invention is not limited to this. For example, as shown in FIG. The present invention can also be applied to a stacked heat exchanger 20 provided with a tank 21 having an inclined portion 11a facing outward in the stacking direction of the core 2 at the opposed inner end. Of course, it is needless to say that the same effect as that of the above-mentioned laminated heat exchanger 10 can be obtained also in the laminated heat exchanger 20. Incidentally, these tanks 11 and 21 can be formed using various methods such as a method of bending a plate material and a method of cutting a square material, respectively. This method is not limited to these. Absent.
[0044]
Further, in the above-described embodiment, the case has been described in which the inclined portions 11a facing outward in the stacking direction of the cores 2 are provided at the inner ends of the tanks 11 and 11 facing the cores 2, The present invention is not limited to this, and the end of the outermost layer of the core 2 facing the tanks 11, that is, the contact portion of the core 2 with the inclined portion 11 a has an inclination corresponding to the inclined portion 11 a. A contact portion may be provided. In this case, the contact portion between the core 2 and each of the tanks 11 and 11 can be brought into close contact with each other, and the bondability between the core 2 and each of the tanks 11 and 11 can be further improved. An advantage that reliability can be remarkably improved can be obtained.
[0045]
Furthermore, in the above-described embodiment, a case has been described in which the fins 5a are provided between the plates 41 and 42, between the plates 43 and 44, between the plates 45 and 46, that is, between the odd-numbered layers of the bars 6a. The invention is not limited to this, and the fins 5a may not be provided between the odd-numbered layers of the bars 6a. In this case, since the number of parts can be reduced, an advantage that cost in production can be reduced can be obtained. On the other hand, when the fins 5a are provided between the bars 6a of the odd-numbered layers as in the above-described embodiment, the flow resistance of the heat exchange medium in the odd-numbered layers can be increased, so that the heat exchange efficiency can be improved. Can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of an embodiment of a stacked heat exchanger according to the present invention.
FIG. 2 is an exploded perspective view showing a main part of the stacked heat exchanger of FIG. 1;
FIG. 3 is a cross-sectional view showing an AA cross section of the stacked heat exchanger of FIG. 1;
FIG. 4 is a cross-sectional view illustrating a schematic configuration of another embodiment of the stacked heat exchanger according to the present invention.
FIG. 5 is a perspective view showing a schematic configuration of a conventional laminated heat exchanger.
FIG. 6 is a cross-sectional view showing a cross section AA in the stacked heat exchanger of FIG. 5;
[Explanation of symbols]
2 Core (heat exchange part)
41, 42, 43, 44, 45, 46 ... plates 5a, 5b ... fins 6a, 6b ... bars (spacers)
Reference numeral 8: brazing material 9: contact portion 10, 20: laminated heat exchanger 11, 21, tank 11a: inclined portion

Claims (4)

A heat exchange unit (2) formed by alternately stacking a plurality of plates (41, 42, 43, 44, 45, 46) and a plurality of spacers (6a, 6b), and an end of the heat exchange unit (2) In a laminated heat exchanger having a pair of tanks (11, 21) provided in the section,
The pair of tanks (11, 21) is formed to be larger than the outer dimension of the heat exchange unit (2), and is provided at an inner end of the pair of tanks (11, 21) facing the heat exchange unit (2). And a laminated heat exchanger (10, 20) characterized by providing an inclined portion (11a) directed outward in the laminating direction of the heat exchange portion (2). The abutting portion having an inclination corresponding to the inclined portion (11a) is provided at an outermost layer end of the heat exchange portion (2) facing the pair of tanks (11, 21). The stacked heat exchanger according to claim 1, (10, 20). A plurality of plates (41, 42, 43, 44, 45, 46) and a plurality of spacers (6a, 6b) are alternately laminated with a brazing material (8) interposed therebetween to temporarily form a heat exchange section (2). A temporary assembly process to assemble,
A tank arranging step of arranging a pair of tanks (11, 21) at an end of the temporarily assembled heat exchange section (2) via a brazing material (8);
A brazing step of brazing the temporarily assembled heat exchange section (2) and the pair of tanks (11, 21) integrally;
The pair of tanks (11, 21) is formed to be larger than the outer dimension of the heat exchange unit (2), and is provided at the inner end facing the heat exchange unit (2) with the heat exchange unit (2). Providing an inclined portion (11a) directed outward in the stacking direction;
The method for manufacturing a laminated heat exchanger (10, 20), wherein the pair of tanks (11, 21) are pressed in a direction of drawing toward each other during the brazing step. The abutting portion having an inclination corresponding to the inclined portion (11a) is provided at an outermost layer end of the heat exchange portion (2) facing the pair of tanks (11, 21). 3. The method for manufacturing a laminated heat exchanger (10, 20) according to 3.

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