JP3517228B2 - Heat exchanger manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat exchanger for a vehicle such as a condenser, a radiator and an intercooler of an air conditioner.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger for a vehicle, corrugated fins and flat tubes are alternately laminated, and end plates are disposed on the outer sides of the corrugated fins at both outer ends of the flat tube. A heat exchanger in which a pair of header tanks are connected to the front and rear ends of the heat exchanger is known. In the manufacture of such a heat exchanger, for example, as shown in FIG. 6, the flat tube 101, the corrugated fins 102, the end plate 103, and the header tank 104 are temporarily assembled and then laterally cured to the outside of the end plate 103. Ingredient 105
Is set, the fastening jigs 106 are hung and held at several positions between the horizontal jigs 105 at both ends, and brazing is performed in the furnace in that state.

[0003]

However, in the above manufacturing method, the end plate 1 is moved by the horizontal jig 105.
03, and the flat tube 101 is inserted into and supported by the header tanks 104 at both ends. Therefore, if the binding jig 106 is tightened too much, after brazing, the central portion is deformed and dented as shown in FIG. It may end up. Especially horizontal jig 1
05 and the binding jig 106 are made of iron, the end plate 10
3. If the flat tubes 101, the fins 102, and the header tank 104 are made of aluminum, the aluminum is relatively thermally contracted due to the difference in thermal expansion due to the difference in material, and is deformed as shown in FIG. Tends to end. Due to this difference in thermal expansion, the flat tube 101 and the fins 102 are
May be recessed into a concave shape, and the fins 102 at both ends may buckle, and brazing with the flat tube 101 may not be performed sufficiently.

As a countermeasure against this, as shown in FIG.
Considering the difference in thermal expansion, it is possible to temporarily assemble the flat tube into a medium convex shape. In this temporary assembly state,
By heating and brazing in a furnace, the difference in thermal expansion is absorbed and the flat tubes and fins are assembled in a normal state.
(Figure 9)

However, as can be seen in FIG.
Since 02 is assembled in a convex shape and the end plate 103 is straight, a gap is formed between the fins 102 and both ends of the end plate 103 in the longitudinal direction. As a result, the fins 102 at both ends may be displaced, or the fins 102 may not be brazed sufficiently.

The present invention solves the above-mentioned problems of the prior art and securely holds a heat exchanger with a jig during temporary assembly,
An object of the present invention is to provide a method for manufacturing a heat exchanger that is reliably brazed without deformation of the end plates, fins, and flat tubes of the heat exchanger even when heating and brazing in a furnace.

[0007]

According to the invention of claim 1, a plurality of inventions are provided.
Of the corrugated fins and the flat tubes are stacked alternately,
Each corrugated fin at both outer ends in the stacking direction of its
Place both ends of the flat tube in the longitudinal direction.
For manufacturing heat exchanger in which each is inserted into header tank
And the corrugated fiber located on the outer side in the stacking direction.
And the flat middle part of the tube in the longitudinal direction
Positioned outward in the stacking direction, with protrusions at both ends in the longitudinal direction
The end plates on both sides of the corrugated fiber
Are placed outside the stacking direction of the
Both ends in the longitudinal direction of the corrugated fin at the outer end
Support it so that it will not be misaligned, and then
Use a jig to bind the tube, flat tube and end plate
By temporarily tightening and holding them in the stacking direction.
After mounting, make sure that each member in the temporarily assembled state is
Heated to a give Ru constituting the heat exchanger by brazing to each other, relative to the fins of the temporary assembling thermal exchanger middle convex, it is possible to support the fin at both ends with the projections The entire fin can be held securely.

According to a second aspect of the present invention, in the method of manufacturing the heat exchanger according to the first aspect, since the protrusion is provided substantially at the center in the width direction of the end plate, the fins can be held in a laterally balanced manner during temporary assembly. At the same time, after the furnace is mounted, the fins are brazed to the end plates in a well-balanced manner at the portions where no protrusions are provided.

According to a third aspect of the present invention, in the heat exchanger manufacturing method according to the first or second aspect, since the protruding ribs are provided over the entire length in the longitudinal direction of the end plate, the end fins can be firmly held. Even if there are variations in fin height and tube thickness, the fins can be securely held without falling during transportation or temporary assembly.

According to a fourth aspect of the present invention, in the method of manufacturing the heat exchanger according to the third aspect, since the protrusion is integrally provided on the extension line of the protruding rib, it is easy to form the protruding rib. In addition, the fins temporarily assembled in the middle convex shape can be held smoothly over the entire length, and the fins can be prevented from being deformed.

According to a fifth aspect of the present invention, in the method for manufacturing a heat exchanger according to any one of the first to fourth aspects, the maximum height of the protrusions is 0.4 to 1.2 millimeters. Since the gap between the both ends of the fin and the end plate at the time of temporary assembly can be effectively reduced, the fin can be prevented from falling off and brazing of the end portion between the fin and the end plate can be ensured.

According to a sixth aspect of the present invention, in the heat exchanger manufacturing method according to any one of the first to fifth aspects, the height of the protruding rib is set to 0.2 to 0.8 mm, and Since the maximum height is set to 0.2 to 1.0 mm higher than the protruding rib, the gap between the fins and both end portions of the end plate when the heat exchanger is temporarily assembled can be effectively reduced. The fins can be prevented from falling off, brazing of the end portions between the fins and the end plate can be secured, and the end fins can be firmly held, so even if there are variations in fin height and tube thickness, they can be transported or temporarily The fins can be securely held without falling off during assembly.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the heat exchanger 1
The plurality of flat tubes 2 and the heat-dissipating corrugated fins 3 are vertically stacked, and header tanks 4 and 5 are provided at both ends of the flat tubes 2 and are brazed. End plates 6 and 7 are provided outside the corrugated fins 3 at the upper and lower ends.

The end plates 6 and 7 are shown in FIGS.
As shown in, consisting of a long plate member made of flat aluminum,
A single protruding rib 8 is provided at the center in the width direction.
Both ends in the longitudinal direction of the protruding rib 8 are smoothly formed as a protrusion 9 having a high protruding height. That is, substantially straight protruding ribs 8 are formed in the longitudinal middle portions of the end plates 6 and 7.
The both ends in the longitudinal direction of the are formed with projections 9 that gradually increase toward the tip. The length of the portion L1 whose height gradually increases is about 30 mm.

Next, a method of manufacturing the heat exchanger 1 will be described.
As shown in FIG. 1, the flat tubes 2 and the fins 3 are laminated, the end portions of the flat tubes 2 are inserted into the header tanks 4 and 5, and the end plates 6 and 7 are arranged outside the fins 3 and set. In that case, the laminated fins 3 and the flat tubes 2 are set so that the central portions thereof have some middle protrusions, and the projections 9 at both end portions in the longitudinal direction of the end plates 6 and 7 support both end portions of the fins 3. set. And
The horizontal jig 10 is set on the outer side of the end plates 6 and 7, and the upper and lower horizontal jigs 10 are fastened and held by a binding jig 11 for temporary assembly. In this case, the end plates 6 and 7
The tip portions of the fins 3 are held by the projections 9 and prevent the end portions of the fins 3 from being displaced or dropped.

The one temporarily assembled in this state is put in a furnace and heated and brazed. As a result, a heat exchanger as shown in FIG. 2 is obtained. Since both ends of the flat tube 2 are inserted into the header tanks 4 and 5 and positioned, the central portion contracts due to thermal expansion, and as a result, the flat tube 2 becomes straight. In accordance with this movement of the flat tube 2, the fin 3 also becomes almost straight. In the present invention,
By devising the end plates 6 and 7 as described above, the effective heat exchanger 1 can be obtained.

In order to set the shape and size of the projections 9 on the end plates 6 and 7, the experiment was repeated on the gap formed between the fin 3 and the end plates 6 and 7.
The horizontal jig 10 and the bundling jig 11 are made of stainless steel, the heat exchanger 1 is made of aluminum, and the stack height of the flat tubes 2 and the fins 3 is 200 to 500 mm. Brazed As a result, it was found that the both ends of the fin 3 had a gap of 0.8 to 2.0 mm. From this experimental result, the height H1 of the protruding rib 8 is set to 0.2 to 0.8 mm, and the protrusion 9
The maximum height of the tip end of each of the protruding ribs 8 is 0.2 to 1.
It was decided to set it 0 mm higher. That is, the maximum height H2 of the protrusion 9 is 0.4 to 1.2 mm.

In this embodiment, the protrusion 8 and the protruding rib 9
Is provided at the center of the end plates 6 and 7 in the width direction by one strip. Considering the temporary assembling property, it is advantageous to provide a double shape such as two threads, but considering the shape after brazing, the fins 3 are deformed at the portions corresponding to the protrusions 8 and the protruding ribs 9. Becomes In consideration of the deformation and appearance of the fins 3, it is preferable that the protrusion 8 and the protruding rib 9 have one line.

In this embodiment, the end plate has a flat plate shape, but the present invention can also be applied to a known end plate having a substantially U-shaped cross section. The protrusions 9 and the protruding ribs 8 provided on the end plates 6 and 7 have a function of preventing the fins from dropping even if they are provided on only one end plate, but it is preferable to provide both.

[0020]

According to the present invention, projections projecting toward the fins are provided at both end portions in the longitudinal direction of the end plate, and the height of the projections gradually increases toward the tip portion, which is a medium convex shape. Since the fins at both ends can be supported by the protrusions with respect to the fins of the heat exchanger temporarily assembled in, the entire fins can be reliably held.

When the protruding ribs are provided over the entire length in the longitudinal direction of the end plate, the end fins can be firmly held, and even if there are variations in fin height and tube thickness, the fins may drop during transportation or temporary assembly. The fins can be held securely without performing.

The height of the protruding rib is set to 0.2 to 0.8 mm, and the maximum height of the protrusion is set to 0.
If the height is set to 2 to 1.0 mm higher, the gap between the fin and the end plate at the time of temporary assembly of the heat exchanger can be eliminated, and the fin can be prevented from falling off and the end of the fin and the end plate can be prevented. Since brazing can be secured and the end fins can be firmly held, even if there are variations in fin height and tube thickness, the fins can be securely held without falling off during temporary assembly or brazing. You can braze.

[Brief description of drawings]

FIG. 1 shows a temporary assembly state of a heat exchanger of the present invention.

FIG. 2 shows a state after brazing of the heat exchanger of the present invention.

3 shows an end plate of the heat exchanger of FIG.
(A) is a plan view and (b) is a front view.

4 shows a side view of the end plate of FIG.

5 is a sectional view taken along line AA of the end plate of FIG.

FIG. 6 shows a state of temporary assembly of a conventional heat exchanger, (a)
Is a front view and (b) is a BB cross-sectional view.

7 shows the heat exchanger of FIG. 6 after brazing.

FIG. 8 shows another temporary assembly state of the conventional heat exchanger.

9 shows the heat exchanger of FIG. 8 after brazing.

[Explanation of symbols]

1 heat exchanger 2 Flat tube 3 corrugated fins 4, 5 header tank 6,7 End plate 8 protruding ribs 9 protrusions 10 Horizontal jig 11 Binding jig

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Claims (6)

(57) [Claims] 1. A stacking a plurality of corrugated fins and the flat tubes alternately corrugated at both outer ends in the stacking direction of its
Arrange the fins, and use the flat tube
Heat that inserts both longitudinal ends of each into the header tank
A method of manufacturing a exchanger, the corrugated fins located in the stacking direction outside and flat
The longitudinal middle part of the tube is outside the stacking direction
To the side, and projections are provided at both ends in the longitudinal direction.
How to stack corrugated fins on both outer ends
They are placed on the outer side of each side and the protrusions above
Displace both ends of the rugate fin in the longitudinal direction.
No way support, then, the corrugated fins, the flat tube and ene
Clamp the plate in the stacking direction using a binding jig.
By holding it in a temporary assembled state, and then heating each member in the temporary assembled state to
A method of manufacturing a heat exchanger, characterized in that the heat exchanger is obtained by brazing . 2. The method of manufacturing a heat exchanger according to claim 1, wherein the protrusion is provided substantially at the center of the end plate in the width direction. 3. The method of manufacturing a heat exchanger according to claim 1, wherein the protruding ribs are provided over the entire length of the end plate in the longitudinal direction. 4. The method for manufacturing a heat exchanger according to claim 3, wherein the protrusion is integrally provided on an extension line of the protruding rib portion. 5. The method of manufacturing a heat exchanger according to claim 1, wherein the maximum height of the protrusions is 0.4 to 1.2 millimeters. 6. The height of the protruding rib is set to 0.2 to 0.8 mm, and the maximum height of the protrusion is set to 0.2 to 1.0 mm higher than the protruding rib. The heat exchanger according to any one of claims 1 to 5 ,
Manufacturing method .