JPS61152332A - Preparation of heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the production defects due to bending work by joining a meandering fin continuous to the half height of the interval between the coolant passing pipes after bending, onto the both side surfaces of the coolant passing pipe and bending the coolant passing pipe into meandering form, thus increasing the buckling strength and sacrifice corrosion. CONSTITUTION:Onto the both side surfaces of a coolant passage pipe 1 having the length corresponding to one unit of the core of a heat exchanger, a fin 2 curved into meandering is brazed. The height 6 of the fin is the half of the interval between pipes in the case when the pipe 1 is bent. Therefore, the height of the fin can be reduced to half, and the buckling strength can be increased, and since the fin 2 exists also in a bent part 3, the sacrifice corrosion effect by the combination of material can be expected. Further, the production defects such as buckling of the fin 2 due to the precision in bending work of the coolant passing pipe 1 and brazing defect can be reduced, and the necessary manhour in assembly work can be reduced by the reduction of the number of parts of the fin 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a heat exchanger TIA device that combines a meandering refrigerant passage pipe and a meandering fin therebetween. be.

[Conventional technology]

Conventionally, in this type of heat exchanger t's, as shown in a schematic diagram of the external appearance in FIG. Insert and braze.

[Problem that the invention seeks to solve]

In the conventional heat exchanger, when brazing the refrigerant passage pipes 1 and the fins 2, it is necessary to apply a load to bring them into close contact, and during the brazing, the fins 2 move in the direction of arrow A in FIG. 2(b). There is a problem in that it buckles as shown in . In addition, the fins 2 are sacrificially corroded using a material with a low potential to protect the refrigerant passage pipe l, but since the bent portion 3 shown in FIG. 2(a) is not in contact with the fin material, this protection The problem is that it is not effective.

Furthermore, since each fin 2 is inserted between adjacent refrigerant passage pipes l, n+2) fins are required for the number n of bends in the passage pipe, which poses the problem of an increase in the number of fin parts. be.

Means for Solving Problem c] The present invention involves brazing serpentine fins on both sides of the refrigerant passage pipe before bending the refrigerant passage pipe into a serpentine shape, and then bending the pipe to form a core. It was designed to do so.

[For production]

By halving the fin height, the buckling strength increases, and since fin material is also present at the bent part of the refrigerant passage pipe, sacrificial corrosion effects can be expected due to the combination of materials. Since only brazing is required, the number of fin parts is reduced.

〔Example〕

An embodiment of the method for manufacturing a heat exchanger according to the present invention will be described below. Fig. 1 (δ), peak) is a schematic external view showing an example of a heat exchanger manufactured by the manufacturing method of the present invention. Continuous fins 2 bent in a serpentine shape are brazed to both sides of a long refrigerant passage pipe 1 (flat tube), and the height 6 of the fins 2 is determined by bending the refrigerant passage pipe 1 in a serpentine shape. The height is half the distance between the refrigerant passage pipes when the core is formed.

5 is a jig for pressing and brazing the fins 2.Next, there is a refrigerant passage pipe l formed as shown in FIG. 1(a) above.
The core 4 of the heat exchanger is formed by bending it into a serpentine shape as shown in Figure 1 (b1).Here, in order to have a sacrificial corrosion effect on the fins, for example, the tube 1 is made of JISA3003.
JISA1050 for fins and materials that are susceptible to potential, such as
A combination of low-potential materials, such as Zn or Sn, is used.

In addition, FIG. 3 shows another embodiment of the manufacturing method of the present invention, in which the fins 2 are made flat only at the bent portions 3 of the refrigerant passage pipes l. Further, the manufacturing method of the present invention can also be applied to a refrigerant passage pipe of an extruded multi-hole flat tube as shown in FIG. 4. Furthermore, the manufacturing method of the present invention can also be applied to a plate-molded flat tube with inner fins having fins housed inside as shown in FIG.

Next, FIG. 6 shows an embodiment of the method of the present invention in which tubes and fins, which are refrigerant passage pipes, are manufactured and brazed continuously. The tubes and fins that come out of each manufacturing machine are placed in the order of fin 2, tube 11, and fin 2 in jig 5, and then brazed in continuous furnace 9, and then removed from the continuous furnace. The obtained finned tube is cut to the length of one core, and then bent into a meandering shape as in the previous embodiment to form a core.

Next, as an example of the method of bending the bent portion 3 of the refrigerant passage pipe, as shown in FIG. This bends the refrigerant passage pipe.

In addition, FIG. 8 (al, (bl, (C1, (dl) is a process diagram of another example of the method for processing the bent portion of the refrigerant passage pipe,
By press working using a jig 10°10' (al,
Bending step by step in the order of (b), (C1, and (d)).

In addition, Figures 9 (jI) and (b) are examples of a method for simultaneously bending multiple bends of refrigerant passage pipes for one core in one operation, as shown in Figure 9 (al). By attaching the bender 11 to the bent portion and simultaneously pulling it up and down in the direction of the arrow while pushing it from the left and right sides, a core like the one shown in item 9) can be manufactured in one process.

〔Effect of the invention〕

In the heat exchanger manufacturing method of the present invention, the buckling strength is increased by halving the fin height, and manufacturing defects such as fin buckling and brazing defects due to the precision of bending of the refrigerant passage pipes are reduced. Since the fin material is also present at the bent part of the refrigerant passage pipe, a sacrificial corrosion effect can be expected due to the combination of materials.Also, since two consecutive fins are sufficient, the number of fin parts is reduced. There are effects such as being able to omit assembly man-hours.

[Brief explanation of the drawing]

FIG. 1(a) is a schematic diagram of an intermediate step in the method for manufacturing a heat exchanger according to the present invention, and Figure 1 (a) is an external view of the core of a heat exchanger manufactured by the method for manufacturing a heat exchanger according to the present invention. Pattern diagram,
Figure 2 (al is a schematic external view of the core of a heat exchanger manufactured by the conventional manufacturing method, and Figure 2 (bl is a partially enlarged schematic diagram showing the buckled state of the fins in the core of the heat exchanger manufactured by the conventional manufacturing method) 3 is a schematic diagram of an intermediate step in another embodiment of the manufacturing method according to the present invention, and FIG. 4 is an extruded multi-hole flat pipe as a refrigerant passage pipe in the method for manufacturing a heat exchanger according to the present invention. FIG. 5 is a schematic diagram of an intermediate step when a plate-formed flat tube with inner fins is used as a refrigerant passage pipe in the manufacturing method of the present invention. FIGS. 7 and 8 are schematic diagrams of intermediate steps of an embodiment of a method for continuously manufacturing and brazing refrigerant passage pipes and fins in
al, (bl, (cl, (d) is a schematic diagram showing an example of the bending method at the bent part of the refrigerant passage pipe in the manufacturing method of the present invention, FIG. 9 (8). It is a schematic diagram of an embodiment in which bending of refrigerant passage pipes for one core unit is performed at the same time in one process. l... Refrigerant passage pipe, 2... Fin, 3... Bending portion, 4... ...Core, 6...Fin height, 5...11
3fL,, lO-・10'...Jig, 11...Hender.

Claims (1)

[Claims] After brazing and joining continuous serpentine fins with a height half the distance between adjacent refrigerant passage pipes when bent, to both sides of the refrigerant passage pipe before being bent into a serpentine shape, the refrigerant passage A method of manufacturing a heat exchanger, which comprises forming a core by bending a tube into a meandering shape.