JP3731941B2 - Manufacturing method of heat exchanger for refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a refrigerator.
[0002]
[Prior art]
As shown in FIGS. 9 and 10, a conventional heat exchanger such as this type of refrigerator has a hole having a diameter larger than the pipe diameter in the center of fins (for example, 50 mm × 70 mm) independently formed one by one. In advance, one pipe was inserted into the hole as shown in FIG. 10, and then a pipe expansion jig was inserted into the pipe together with the lubricating oil so that the outer periphery of the pipe was brought into close contact with the fin. Course be the cleaning of lubricating oils is a problem that put in the pipe during pipe expansion in this way, molding or separate one by one the fins, aligned or working through the pipe was very troublesome. For this reason, this kind of heat exchanger could never be said to have good productivity. An example of this type of conventional heat exchanger for a refrigerator is Japanese Patent Publication No. 3-50193.
[0003]
[Problems to be solved by the invention]
(1) In the case of using a fin as a heat exchanger by passing each fin through the pipe, the equipment cost for automatically arranging the fins one by one with a certain problem when passing the pipe through the fin is high. There was a problem.
[0004]
(2) In order to improve the contact between the pipe and the fin, the pipe is expanded so that the pipe diameter is larger than the diameter of the fin after passing the pipe through the hole of the fin. It is necessary to remove the oil after expansion. There was a problem that this removal was very difficult.
[0005]
(3) The fins as in (1) are difficult to organize and store unless they are formed one by one at the edge of the line, so that operations such as making-up cannot be performed and it is necessary to always synchronize with the pipe expansion machine. For this reason, when one side has a failure etc., there also existed a problem that the other (for example, pipe insertion or tube expansion machine) was idle.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above-described conventional problems.
[0007]
That is, a step of forming a strip-like fin having a hole for penetrating a pipe into a corrugated fin block using a roll forming machine or the like, and a step of inserting a long pipe while deforming the peripheral shape of the hole for penetrating the pipe And a step of bending the long pipe in a meandering manner between the corrugated fin blocks, the pipe penetration hole being a long hole in the feed direction to the roll molding machine, and hitting the feed direction to the roll molding machine By adopting a heat exchanger manufacturing method in which notches or grooves are provided in the periphery of the pipe through-hole, it is possible to eliminate the inconvenience of conventional fin molding and facilitate the work in parallel with the fins. The pipe expansion work, which was the biggest problem, was eliminated and the pipe cleaning work was eliminated.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Details of this embodiment will be described below with reference to the embodiments shown in FIGS.
[0009]
First, FIG. 1 is a front view of a heat exchanger provided with the present invention, FIG. 2 is a developed view of a strip-like fin used in FIG. 1, (a) shows an example of a row of pipes, and (b) shows a pipe 2 (C) is a figure which shows the example different from (a). In the figure, 1 is a heat exchanger body. The heat exchanger body 1 includes a pipe 2 and a corrugated fin block 3 that are bent in a serpentine shape. Since the heat exchanger body 1 is formed by bending a single groove plate into a corrugated shape as will be described in detail later, the wind is normally used in the direction of the arrow. Next, in FIG. 2, 3a, 3b, and 3c are band-like fins for making corrugated fin blocks, 3a and 3c are band-like fins that can be inserted into one row of pipes, and 3b is a row of pipes that can be inserted into two rows of pipes. Pipe penetration holes shown in (a) and (b) are formed so as to be elongated in the feed direction to a roll forming machine described later. (C) intended to provided the kerf 4a in a round hole, which is also that provided as shown in FIG feed direction of the roll forming machine. Reference numeral 5 denotes a folding line when the strip-like fins 3a and 3b are folded into corrugated fin blocks using the roll forming machine 6 shown in FIG. The band-like fins 3a, 3b, 3c are bent at the fold line 5 to form the corrugated fin block 3 shown in FIG.
[0010]
Next, referring to FIG. 4, the pipe penetration hole 4 provided in the belt-like fins 3a, 3b, 3c will be described. Pipe penetration hole 4, for example, in the case where the pipe outside diameter was 8 mm (dotted line) to be inserted are drilled in 7 mm (solid line of the slot). Reference numeral 4a denotes a notch (cut groove) provided in the periphery of the pipe penetration hole. The notch 4a and the long hole are provided so that the pipe penetration hole 4a can be deformed according to the outer diameter of the pipe 2 without a large resistance when the pipe 2 having a large diameter is inserted and inserted. Thus, the bending dimensional error at the time of folding along the folding line of FIG. 2 is absorbed.
[0011]
Next, in FIG. 5, when the pipe 2 is inserted into the pipe penetration hole 4 provided in the strip-like fins 3a, 3b, 3c, the periphery of the pipe penetration hole 4 becomes the outer diameter of the pipe 2 as shown in FIG. The collar 4b is formed just like burring on the corrugated fin block 3 side. This increases the contact area between the pipe 2 and the corrugated fin block 3 and improves the fin efficiency.
[0012]
Next, how to make the heat exchanger body 1 of the present invention will be described with reference to FIGS. 6, 7, and 8. 2 is a pipe and 3 is a corrugated fin block. First, as shown in FIGS. 6 and 7, several corrugated fin blocks 3 are set at predetermined intervals. Next, the pipe 2 is inserted into the pipe penetration hole 4 described above. Thereafter, the heat exchanger body 1 is completed by bending the pipe 2 as indicated by the dotted line.
[0013]
The same applies when the shape of the corrugated fin block 3 is changed as shown in FIG. 7 and when the U-shaped pipe 2 is used. Although there is a bending method shown in FIG. 7, if the bending method is changed, the heat exchanger shown in FIG. 6 may be used.
[0014]
If the U-shaped pipe 2 is used, it is convenient when the strip-shaped fin 3 is provided with two pipe penetration holes 3b. That is, when using two heat exchangers of FIG. Also, by changing the shape of the strip fin 3, when used as a heat exchanger (evaporator or condenser of a refrigerator), it can be adjusted to various conditions such as frosted ventilation resistance.
[0015]
The heat exchanger main body 1 is a belt-shaped fin 3a, 3b, etc. with a pipe penetration hole 4 opened, and is folded from a folding line 5 as shown in FIG. A step of forming the fin block 3, a step of inserting the pipe 2 into the hole 4 for penetrating the corrugated fin block 3 so as to form the collar 4 b, and a step of bending the pipe 2 as shown in FIG. 6 (FIG. 7). ing.
[0016]
As in the prior art, pipe expansion work for reducing the contact thermal resistance between the fin and the pipe is not required, so that cleaning of the pipe is not required. In the present invention, the range of use of the heat exchanger can be expanded by selectively adopting the density of the corrugated fin block 3.
[0017]
【The invention's effect】
In the present invention, since the fins are not independent one by one, even if the corrugated fin block is aligned using the hiring equipment etc., it can be handled as a fin block, so hiring, equipment etc. are compared with the conventional one And it can be cheap and simple.
[0018]
In addition, since the pipe expansion work to increase the pipe diameter is not required for good contact between the fin and the pipe, the processing fraction can be greatly reduced, and a special cleaning agent is required for cleaning the pipe. And not.
[Brief description of the drawings]
FIG. 1 is a front view of a heat exchanger provided with the present invention.
FIG. 2 is an explanatory view of a pipe row in the development of the band-like fins used in FIG.
3 is a cross-sectional view of a main part of a corrugated fin block obtained by bending the belt-like fin of FIG. 2 into a corrugated shape.
FIG. 4 is an explanatory diagram of a hole for penetrating a pipe provided in a belt-like fin.
FIG. 5 is an explanatory view showing a state in which a pipe is inserted into the corrugated fin block of FIG. 3;
FIG. 6 is an explanatory view showing a state in which several corrugated fin blocks are attached to a long pipe.
FIG. 7 is an explanatory view showing an embodiment different from FIG.
8 is an explanatory view showing a roll forming machine that bends the band-like fins of FIG. 2 along a fold line.
FIG. 9 is a front view of a conventional heat exchanger.
10 is an explanatory diagram showing how to make the heat exchanger of FIG. 9. FIG.
[Explanation of symbols]
1 ... heat exchanger body,
2 ... pipe,
3. Wave corrugated fin block,
3a, 3b ... strip-shaped fins,
4 ... Pipe penetration hole,
4a ... notch (groove),
4b ... color,
5 ... Fold line,
6 ... Roll forming machine.

Claims (1)

A step of forming the corrugated fins blocking strip fins having a pipe through hole by using a roll molding machine, and interpolating the pipe fitted process fitting an elongated pipe while deforming the peripheral edge shape of the pipe through hole , possess a step of folding said long pipe meanders between the corrugated fin block,
The pipe penetration hole is a long hole in the feed direction to the roll forming machine,
A method of manufacturing a heat exchanger in which a notch or a groove is provided in the periphery of the hole for penetrating a pipe at a position corresponding to a feeding direction to the roll forming machine .

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