JPH081265A - Production of heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a blade of a die from being broken caused by biting a corner part cut with a corner cutting die in a method of producing a heat exchanger whose corner part is cut. CONSTITUTION:A seam like depth of cut 1a is formed on a corner part 1c of a plate fin 1 with a slitter having notches on several places of a blade, a heat transfer tube 10 is inserted and fixed to plural sheets of the plate fins 1 arranged parallel, a roller jig 4 is pressed on the corner part 1c having the depth of notch 1a of the plate fin 1, and moved to the arrow mark direction. The corner part 1c of the plate fin 1 is bent sequentially and slowly at the part of the depth of notch 1a, the bending stress is concentrated to the non-cut part of the depth of notch 1a and the corner part 1c is cut.

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 used in a refrigerating / refrigerating machine and an air conditioner machine, in which a corner portion is cut out.

[0002]

2. Description of the Related Art Conventionally, in freezers / refrigerators and air conditioners, downsizing of products has been promoted for the purpose of material cost reduction and space saving. Along with this, the shape of the drain pan, which is one of the structural parts incorporated inside, has become complicated, and some heat exchangers have a shape in which a corner portion is cut out in accordance with the shape of the drain pan.

Hereinafter, the conventional heat exchanger having a cut-away corner will be described with reference to the drawings.

FIG. 7 shows a conventional heat exchanger 5 and drain pan 6.
FIG. 4 is a vertical cross-sectional view showing the positional relationship between the heat exchanger 5 and one corner portion on the lower side of the heat exchanger 5 in accordance with the shape of the drain pan 6 that is located below the heat exchanger 5 and receives the drain generated during the cooling operation. It is cut out.

FIG. 8 is a perspective view showing a cutting process of a corner of a conventional plate fin for a heat exchanger. In the conventional plate fin 7, the end and the corner of the plate fin are simultaneously formed by a die 8 in a pressing process. Disconnected,
The heat exchanger 5 is constructed using the plate fins 7 whose corners are cut.

[0006]

However, the conventional die 8 for cutting the corner portion of the plate fin 7 has a special shape so that the end portion and the corner portion of the plate fin can be cut at the same time. Requires a lot of cost and days. Further, in the step of cutting the corner portion of the plate fin 7, if the corner portion 9 of the cut plate fin 7 remains on the die 8 and the die 8 bites the corner portion 9, the die 8 is damaged. May lead to

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing a heat exchanger having a notched corner portion, which does not cause damage to the mold.

[0008]

To achieve the above object, the present invention forms a perforation-like notch at the corner of a plate fin by a slitter having notches at several positions of a blade to form a plurality of parallel sheets. Insert and fix the heat transfer tube to the plate fins arranged in line, press the roller jig to the notched corner of the plate fin, gradually bend the corners of the plate fin in order at the notched portion, The heat exchanger is manufactured by concentrating the bending stress on the non-cut portion and cutting the corner portion of the plate fin.

Further, a roller jig having a shape in which the diameter becomes smaller from the end portion toward the central portion is pressed against the notched corner portion of the plate fin, and the notched corner portion of the plate fin is gradually increased at the notched portion. The heat exchanger is manufactured by bending and cutting the corners of the plate fins by concentrating bending stress on the non-cut portion of the cut.

[0010]

According to the method of manufacturing a heat exchanger of the present invention, a slitter having notches at several points of the blade is used to form perforations like cuts at the corners of the plate fins and a plurality of them are arranged in parallel. Insert and fix the heat transfer tube to the plate fin, press the roller jig against the notched corner of the plate fin, gradually bend the corner of the plate fin in order at the notch, and cut it into the uncut part of the notch. Since the corners of the plate fins are cut by concentrating bending stress, when forming perforations in the corners of the plate fins, the corners of the plate fins do not separate. The blade is not damaged.

Further, the separation of the corners of the plate fins is performed by inserting and fixing the heat transfer tubes into a plurality of plate fins arranged in parallel to form a heat exchanger in which the corners are not cut out, and then cutting the plate fins. The roller jig is pressed against the corners with a groove, the corners of the plate fins are gradually bent at the notches, the bending stress is concentrated on the non-cut parts of the notches, and the tensile load is applied by moving the roller jig. In addition, since the cutting is performed, the mold is not damaged.

If a roller jig having a shape in which the diameter becomes smaller from the end to the center is used, the corner of the plate fin where the notch is formed is
As the tensile load is applied, the cut portions at both ends of the perforated portion are first separated from the plate fin body at the corners of the plate fin due to the shape effect of the roller jig. Then, along the shape of the roller jig, the cutting portion is gradually separated from the plate fin body so as to be pushed toward the center of the roller jig. In the non-cutting portion of the perforated portion, the force of pushing the corner portion of the plate fin toward the center of the notch applies a shear load that tears off that portion, and the plate fin body is applied from both ends of the perforated portion. Disconnected from. These series of actions
The corner portions of the plate fins can be separated from the heat exchanger main body by sequentially operating the respective perforated portions from the end toward the center.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the heat exchanger manufacturing method of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a plate fin of a heat exchanger according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing a step of forming a perforated cut at a corner portion of the plate fin in the same embodiment, FIG. 3 is a perspective view of a slitter used in the embodiment,
FIG. 4 is a perspective view showing a step of separating the corner portion of the plate fin in the same embodiment.

In the drawing, 1 is a notch at several points of the blade 2
It is a plate fin in which a perforated cut 1a is formed in a corner portion 1c by a slitter 2 having a. 3 is a cutter that cuts the plate fins to an appropriate length. 10 is a plate fin 1 in which a plurality of plates are arranged in parallel
The heat transfer tube is inserted into the heat transfer tube insertion hole 1a and expanded and fixed. Reference numeral 4 is a cylindrical roller jig that is pressed against the corner portion 1c of the plate fin 1 having the cut 1a and gradually bends the corner portion 1c in order.

Next, a method of manufacturing the heat exchanger of the first embodiment will be described. As shown in FIG. 2, in a press step for processing the plate fin 1, a perforated machine having a cutter 3 that cuts the end of the plate fin 1 perpendicularly to the longitudinal direction and notches 2a at several points of the blade. By interlocking the slitter 2, at the same time as cutting the end portion of the plate fin, a perforated cut 1a is provided in the corner portion 1c of the end portion. At this time, since the corner portion 1c of the plate fin is not separated, the separated corner portion 1c does not damage the blade of the slitter 2.

Next, after the heat transfer tubes 10 are inserted and fixed to the plate fins 1 arranged in parallel to each other to form a heat exchanger in which the corners 1c are not cut out, as shown in FIG.
Corner part 1c with notch 1a of plate fin 1
The roller jig 4 is pressed against and moved in the direction of the arrow in FIG. 4, the corners 1c of the plate fins 1 are gradually bent at the notches 1a, and bending stress is concentrated on the non-cut portions of the notches 1a. And roller jig 4
4 is moved in the direction of the arrow in FIG. 4 to apply a tensile load to cut the corner portion 1c and obtain a heat exchanger with the corner portion 1c cut out. When cutting the corner 1c, the roller jig 4 is used and the mold is not used.
Does not damage the mold.

Next, the second method of manufacturing the heat exchanger of the present invention
Embodiment will be described with reference to the drawings, but the detailed description of the same portions as those of the first embodiment will be omitted. FIG. 5 is a perspective view showing a step of separating a corner portion of a plate fin in the second embodiment of the present invention, and FIG. 6 is a front view of a roller jig used in the same embodiment.

In the figure, reference numeral 4'denotes a roller jig having a shape in which the diameter becomes smaller from the end to the center.

Next, a method of manufacturing the heat exchanger of the second embodiment will be described. At the same time as cutting the end portion of the plate fin, a perforated cut 1a is formed in the corner portion 1c of the end portion.
Since the method of providing is the same as that of the first embodiment, the subsequent steps will be described.

First, after inserting and fixing the heat transfer tubes 10 into the plate fins 1 arranged in parallel to form a heat exchanger in which the corners 1c are not cut out, as shown in FIG.
Corner part 1c with notch 1a of plate fin 1
The roller jig 4 ′ is pressed against and is moved in the direction of the arrow in FIG. 5, and the corner portion 1 c of the plate fin 1 is gradually bent at the notch 1 a in order.

The roller jig 4'used in this embodiment is
Since the diameter is reduced from the end portion toward the central portion, a tensile load is applied to the corner portion 1c of the plate fin 1 having the notch 1a, and the plate fin 1 is shaped by the shape effect of the roller jig 4 '. In the corner portion 1c, the cut portions at both ends of the perforated portion (cut 1a) are first separated from the plate fin 1 main body. After that, the cutting portion is gradually separated from the plate fin 1 main body so as to be gradually pushed toward the center of the roller jig 4 ′ along the shape of the roller jig 4 ′. Then, in the non-cutting portion of the perforation processing (cutting 1a), a force that pushes the corner portion 1c of the plate fin 1 toward the center of the cutting 1a is applied, and a shearing load that tears off that portion is applied,
The plate fin 1 main body is cut from both ends of the perforated portion (notch 1a). A series of these actions act on the perforated portions (cuts 1a) in order from the end to the center, whereby the corner portion 1c of the plate fin 1 can be separated from the heat exchanger body.

When the roller jig 4'having a shape in which the diameter becomes smaller from the end portion toward the central portion is used, the plate fin 4 is used as compared with the cylindrical roller jig 4 used in the first embodiment. It is easy to separate the corner 1c of 1 and the force to move the roller jig 4'is small,
The workability of cutting the corner portion 1c of the plate fin 1 is improved.

[0023]

As described above, according to the present invention, a slitter having notches at several positions of the blade is used to form a perforated cut at the corner of the plate fin, and a plurality of plate fins are arranged in parallel. Insert and fix the heat transfer tube to the plate fin, press the roller jig against the notched corner of the plate fin, gradually bend the corner of the plate fin at the notched part in order, and bend stress at the uncut part of the notch. Since a heat exchanger is manufactured by cutting the corners of the plate fins by concentrating the heat, the corners of the plate fins do not separate when forming perforated cuts in the corners of the plate fins. The corners do not damage the slitter blade. In addition, since the corners of the plate fins are separated by using a roller jig, the mold is not damaged.

If a roller jig having a shape in which the diameter becomes smaller from the end to the center is used, the corner of the plate fin where the notch is formed is
A shear load is applied in addition to the tensile load, the corners of the plate fins are easily separated, the force for moving the roller jig is small, and the workability of cutting the corners of the plate fins is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing plate fins of a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a step of forming perforated cuts at the corners of the plate fins in the embodiment.

FIG. 3 is a perspective view of a slitter used in the same embodiment.

FIG. 4 is a perspective view showing a step of separating a corner portion of a plate fin in the embodiment.

FIG. 5 is a perspective view showing a step of separating a corner portion of a plate fin in the second embodiment of the present invention.

FIG. 6 is a front view of a roller jig used in the same embodiment.

FIG. 7 is a vertical sectional view showing a positional relationship between a conventional heat exchanger and a drain pan.

FIG. 8 is a perspective view showing a cutting process of a corner of a conventional plate fin for a heat exchanger.

[Explanation of symbols]

 1 Plate Fin 1a Cut 1c Corner 2 Slitter 2a Notch 4, 4'Roller Jig 10 Heat Transfer Tube

Claims (2)

[Claims] 1. A slitter having notches at several points of a blade is used to form perforations at the corners of plate fins, and heat transfer tubes are inserted and fixed in the plate fins arranged in parallel. Press the roller jig against the notched corners of the plate fins, gradually bend the corners of the plate fins in order at the notches, and concentrate the bending stress on the uncut parts of the notches to make the corners of the plate fins. Of manufacturing a heat exchanger for cutting a heat exchanger. 2. A roller jig having a shape in which the diameter becomes smaller from the end to the center is pressed against the notched corner of the plate fin, and the notched corner of the plate fin is gradually increased at the notched portion. The method of manufacturing a heat exchanger according to claim 1, wherein the heat exchanger is manufactured by bending and concentrating bending stress on a non-cut portion of the cut to cut the corner portion of the plate fin.