JPH02169177A - Production of heat exchanger - Google Patents

Abstract

PURPOSE:To easily produce the high-performance heat exchanger by providing plural notches on the ends of fins clad with brazing material, inserting heat transfer tubes into these notches from the ends of the fins and joining the members by heating. CONSTITUTION:The fins 2 clad with the brazing materials on both or one surfaces are provided with the notches by press forming. The notches are formed to the same width as the width of the heat transfer tubes 3. Plural pieces of such fins 2 are arrayed in parallel at specified intervals and the heat transfer tubes 3 are inserted into the notches 4 of the respective fins 2 in the direction A from the front edge direction of the fins to assemble the heat exchanger. The assembled fins 2 and the heat transfer tubes 3 are heated in a furnace and are joined by the brazing materials clad on the fins 2. The fins 2 are prevented from being damaged and the heat transfer tubes 3 from being bent in this way at the time of insertion. The stable brazing is thus executed in the state of having no clearances between the fins 2 and the heat transfer tubes 3.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a method for manufacturing heat exchangers used in automobile equipment, air conditioning equipment, and refrigeration equipment.

Conventional technology Heat exchangers that transfer heat between refrigerant and air or other fluids have been required to be more compact in recent years from the perspective of device design, and efforts have been made to improve efficiency by improving the shapes of fins and heat transfer tubes. It is. In order to improve the efficiency of heat transfer tubes and reduce pressure loss on the air side, efforts are being made to reduce the diameter of heat transfer tubes and introduce oval tubes and multi-hole flat tubes.

First, a heat exchanger manufactured by a conventional manufacturing method will be explained using FIG. 10. In Figure 10, 11
is a heat exchanger, and the heat exchanger 11 is composed of fins 12 arranged in parallel at regular intervals, and heat transfer tubes 13 that penetrate the fins 12 and are joined to the fins 12. The heat exchanger 11 exchanges heat between the fluid flowing inside the heat transfer tubes 13 and the airflow flowing between the fins 12.

Next, FIGS. 11 to 13 show the manufacturing process of a conventional heat exchanger. First, FIG. 11 shows the fin 12 before the heat exchanger is assembled. The fins 12 are provided with heat exchanger tube insertion holes 14 and collars 15 at the edges of the heat exchanger tube insertion holes 14 by press working. The hole diameter of the heat exchanger tube + 1f entry hole 14 is that of the heat exchanger tube 1
3e, the outer diameter is made larger than the heat exchanger tube 13.

These fins 12 are arranged in parallel at regular intervals, and each fin 12
After inserting the heat exchanger tube 13 into the heat exchanger tube insertion hole 14, a mandrel 16 is press-fitted into the heat exchanger tube 13 to expand the tube so that the outer diameter of the tube becomes larger than the heat exchanger tube insertion hole 14.

The expanded heat transfer tube 13 contacts the fins 12 at the collar 15 to improve thermal conductivity.

Problems to be Solved by the Invention However, in the above manufacturing method, when a multi-hole flat tube 17 as shown in FIG. Because of this, it is not possible to expand the tube.

Therefore, when joining such a multi-hole flat tube 17 to the fin 12, a fin material with brazing material clad on both or one side of the fin 12 is used, and the brazing material is melted in a high-temperature furnace. The melted brazing material forms the fins 12 and heat transfer tubes 1.
It is possible to use the furnace brazing method, which joins the fins 12 and the heat exchanger tubes 13 by flowing into the gaps between the heat exchanger tubes 13 and the fins 13. If the fins 12 are small, the fins 12 may be damaged by the tips of the heat transfer tubes 13, and the heat transfer tubes 1 may be damaged due to frictional resistance.
3 bending occurs, so it is necessary to make the gap as large as possible, whereas brazing material bends fin 1 due to surface tension.
The fins 12 flow into the gap between the heat exchanger tubes 13 and the fins 12.
If the gap between the heat exchanger tube 13) and the heat exchanger tube 13) is increased, it becomes difficult for the brazing material to spread, which has the contradictory drawback that stable brazing cannot be performed.

The present invention solves the above-mentioned conventional problems. Even if there is no gap between the fins and the heat exchanger tubes, the heat exchanger can be easily assembled, and further, sufficient and stable bonding between the fins and the heat exchanger tubes can be ensured. A method for manufacturing a heat exchanger is provided.

Means for Solving the Problems) In order to solve the above problems, the heat exchanger manufacturing method of the present invention is to provide a plurality of notches at the ends of the fins clad with brazing material on both or one side. After the heat transfer tube is inserted into the notch from the fin end, both the fin and the heat transfer tube are joined by furnace brazing.

Effect of the Invention According to the method described above, the heat exchanger tube is inserted from the end of the fin where the fin is strong, so that the fin is less likely to be damaged. Furthermore, since the heat exchanger tubes are inserted from the side, no force is applied in the longitudinal direction and the heat exchanger tubes do not bend. Therefore, the heat exchanger tube can be easily inserted into the fin even when there is no gap between the fin and the heat exchanger tube.

Furthermore, when there is no gap between the fins and the heat transfer tube,
Sufficient and stable bonding can be achieved with just one bond, and a high-performance heat exchanger can be manufactured.

EXAMPLE For the first embodiment of the present invention, please refer to the drawings! I will explain.

FIG. 1 shows a heat exchanger manufactured according to an embodiment of the present invention. 1 is a heat exchanger, 2 is a fin arranged in parallel at regular intervals, 3 is a heat exchanger tube joined to the fin 2, and 8
is a flow divider connected to the third end of the heat exchanger tube. heat exchanger 1
The operation is the same as the conventional example. FIG. 2 shows a fin 2 with brazing material clad on both or one side before the heat exchanger is assembled, and the fin 2 has a notch 4 formed by press working. The notch width H of the notch portion 4 is the width of the heat exchanger tube 3 to be inserted.
is the same as the width of

Next, FIG. 8 and FIG. 4 show the manufacturing process of the heat exchanger of this embodiment. 3 is a heat exchanger tube, and A indicates the direction in which the heat exchanger tube is inserted into the fins 2. Fin 2' of 4j! They are arranged in parallel at regular intervals, and heat transfer tubes r3 are inserted into the cutout portions 4 of each fin 2 from the front edge direction of the fins. Fin 2 is not subjected to force from the vertical direction to the fin plane, which has weak strength, but from the horizontal direction A.
In other words, no force is applied from the fin 2 ff, llj parts. In addition, since the heat exchanger tube 3 is inserted from the side direction even if the heat exchanger tube 3 is rfl L/V), no force is applied in the longitudinal direction,
The rti1 song of heat exchanger tube 3 does not occur. Therefore, even when the gap between the fins 2 and the heat exchanger tubes 3 is 41j% smaller, the heat exchanger tubes 3 can be easily inserted into the fins 1. Next, the assembled fins 2 and heat exchanger tubes 3 are soldered in a furnace, and both are joined using a brazing material clad on the fins 2 to form the heat exchanger 1. When brazing in a furnace with almost no gap between the fins 2 and the heat transfer tubes 3, the brazing material spreads between the fins 2 and the heat transfer tubes 3, and sufficient and stable brazing can be performed.

As described above, according to this embodiment, the heat exchanger tube 3 is inserted into the end of the fin 2 clad with brazing material on both or one side.
A notch 4 with the same width as is provided, and after inserting the heat exchanger tube 3 into the notch 4 from the front edge direction, both the fins 2 and the heat exchanger tube 3 are joined by furnace brazing, and the heat exchanger 1 is assembled. By doing so, it is possible to easily assemble the fins 2 and the heat exchanger tubes 3, and also to manufacture a high-performance heat exchanger by sufficiently and stably joining the fins 2 and the heat exchanger tubes 3. Can be done.

In addition, in this embodiment, the notch 4 is provided only on one side of the fin 2.
In the second and third embodiments, as shown in FIG. 5 and FIG. You can.

Next, a fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 7 shows a fin 5 with brazing material clad on both or one side before the heat exchanger is assembled, and the fin 5 has a notch 6 formed by press working. A collar 7 is provided on the edge of the notch 6, and as shown in FIG. 7, the width I between the tips of the collar 7 is smaller than the width of the heat exchanger tube 3 to be inserted, and the width J between the bases is smaller than the width of the heat exchanger tube 3 to be inserted. It is the same as or more than 3.

Other parts and manufacturing processes are the same as in the first embodiment. In this embodiment, as shown in FIG.
When inserting heat transfer f3 into
Even if there are some variations in the fins 5 and the heat exchanger tubes 3, it is possible to eliminate gaps between the fins 5 and the heat exchanger tubes 3. Further, the stress applied to the fins 5 when the heat exchanger tube 3 is inserted is absorbed by the collar 7 by bending along the heat exchanger tube 3, and does not cause the fin 5 itself to bend.

As described above, a notch 6 is provided at the end of the fin 5 clad with brazing material on both sides or one side, and the R:i of the notch 5 is such that the distance between the tips is smaller than that of the heat exchanger tube 3, and the distance between the roots is By providing the weeping collar 7 which is larger than the heat exchanger tube 3, even if there is some variation between the notch 6 of the fin 5 and the heat exchanger tube 3 when the heat exchanger tube 3 is inserted from the front edge direction, there is no gap between the two. Furthermore, by brazing the fins 5 and the heat exchanger tubes 3 with no gaps between them, the fins 5 and the heat exchanger tubes 3 can be completely joined with the brazing material, resulting in high-performance heat exchange. You can make one pile of utensils.

In this embodiment, the heat exchanger tube 3 is a multi-hole flat tube, but the heat exchanger tube 3 may be a circular tube or an elliptical tube.

Effects of the Invention As described above, the present invention provides a plurality of notches at the end of a fin whose both sides or one side are clad with brazing material, and after inserting a heat transfer tube into the notch from the fin end, the furnace is heated. By joining both the fins and the heat exchanger tubes using medium brazing to form a heat exchanger, the heat exchanger can be easily assembled even when there is no gap between the fins and the heat exchanger tubes, and furthermore,
By brazing the fins and the heat exchanger tubes with no gaps between them, the fins and the heat exchanger tubes can be completely joined with the brazing material, and a high-performance heat exchanger can be manufactured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a heat exchanger manufactured by the manufacturing method of the present invention, Fig. 2 is a perspective view of the fins of Fig. 1, and Figs. 3 and 4 are fins of the first embodiment of the present invention. FIG. 5 is a perspective view showing the assembled state of the fins and heat transfer tubes according to the second embodiment of the present invention, and FIG. 6 is a perspective view showing the fins according to the third embodiment of the present invention. FIG. 7 is a perspective view of the fins of the fourth embodiment of the present invention, and FIGS. 8 and 9 are perspective views showing the assembled state of the heat transfer tubes. FIG. 10 is a perspective view of a heat exchanger using a conventional circular tube. FIG. 11 is a perspective view of a conventional fin. FIGS. 12 and 18 are a perspective view of a conventional fin. A perspective view showing a heat exchanger tube joining process, 11th... heat exchanger, 2... fin, 3... heat exchanger tube, 4... notch part. 1-... i wa Return 2--Fin 3-F'1 2 ・~Fun 2--- 7 Iso 3- Heat exchanger tube 4-τ relik; --'cn
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Claims (1)

[Claims] A plurality of notches are provided at the end of the fin, which is clad with brazing material on both sides or one side, and the heat exchanger tube is inserted into the notch from the fin end, and then the fin and the heat exchanger tube are brazed in a furnace. A method for manufacturing a heat exchanger that joins both.