JPS62248525A - Manufacture of hear exchanger - Google Patents

Abstract

PURPOSE:To prevent the generation of the buckling of a heat exchanber and of the bend of a heat transfer fin by moving a heat transfer fin in about liner shape and the assembly item of the heat transfer tube from the inlet port end upto the outlet port end between a pair of guide plates. CONSTITUTION:A heat transfer fin 2 and the assembly item 11 of a heat transfer tube 3 are inserted in order by an insertion device 13 between a pair of guide plates 12. The assembly item 11 is moved to the curving part 12 of the outlet port end with being pushed and bent along a pair of guide plates 12, which are of liner shape at its inlet port end and its outlet port end forms a curving part 12'. Since the heat transfer fin 2 is equally pressed from the outer side in its bending part, no force bending the assembly item 11 is locally applied on the heat transfer tube 3. In this way the bending force is equally applied on the whole body and the heat exchanger having no generation of buckling and bending of the heat transfer fin is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a fin-tube heat exchanger used in air conditioning equipment and the like.

Conventional technology In recent years, with the spread of air conditioning equipment, miniaturization of equipment has become an issue.In particular, in outdoor units such as room air conditioners and package air conditioners, a part of the heat exchanger is curved. They are now being installed inside cabinets to make effective use of the space inside the cabinets. For this reason, methods for manufacturing partially curved heat exchangers have been actively developed.

Hereinafter, an example of a method for manufacturing the conventional partially curved heat exchanger described above will be described with reference to the drawings.

FIG. 3 shows the partially curved heat exchanger in its completed state, and FIG. 4 shows the partially curved heat exchanger installed in the outdoor unit of the air conditioner. FIG. 6 shows a method of manufacturing the partially curved heat exchanger. In FIG. 3, 1 is a partially curved heat exchanger, 2 is a heat transfer fin, 3 is a heat transfer tube, and 4 is an end plate. In Figure 4,
5 is a cabinet, 6 is a fan motor, 7 is a compressor, 8
is the air flow direction, and the heat exchanger is installed with a part curved so that it can have a wide air passage area within a predetermined cabinet size. In Fig. 6, 14 is a device used in the conventional manufacturing method, and 9 is a bending die, which corresponds to a predetermined bending radius.
It has a part of a cylindrical surface. Reference numeral 10 denotes a rotary arm, which can rotate around the center point 16 of the cylindrical surface of the bending die 9. Reference numeral 11 denotes a presser plate, and the joint portion with the rotary arm 1o is of a sliding type. Reference numeral 12 denotes a clamp device, which can fix one end of the heat exchanger to be bent. 13 uses pneumatic pressure, hydraulic pressure, etc.
The presser device is rotatable around a fulcrum 16. This presser device 13 serves as a driving source for the rotating arm 1o. In the figure, the initial state of each part is indicated by a chain line.

Next, a method for manufacturing a partially curved heat exchanger will be explained using FIG. First, each part is indicated by a dashed-dotted line in the figure. Set to initial state. Next, the assembly 1' of the linear heat transfer fins 2 and the heat transfer tubes 3 is set, and the heat transfer tubes 3 are fixed using the clamp device 12. Thereafter, the holding device 13 is activated to rotate the rotary arm 10 to a predetermined position. By doing this, the assembled product 1', which was initially linear,
is bent along the circular pipe surface of the bending die 9, and a partially curved heat exchanger 1 is completed.

Problems to be Solved by the Invention However, in the above method, the heat transfer fins 2 are not pressed from the outside at the bent portion, and bending force is locally applied to the heat transfer tube 3, causing the heat transfer tube 3 to become thin. FIG. 6 shows this state in which buckling often occurs, such as when the refrigerant cools, causing heat exchanger leakage, reduction of the cross section of the refrigerant flow path, and dimensional defects. In addition, even if the heat transfer tube 3 does not buckle, when the heat transfer fins 2 are made thinner, the heat transfer fins 2 in contact with the bending die 9 may partially bend and prevent air passages between the heat transfer fins 2. It's gone. This state is shown in FIG.

In view of the above-mentioned problems, the present invention has been devised so that even when the heat transfer fins and heat transfer tubes are made thinner, the heat exchanger having a partially curved shape can be manufactured without causing buckling of the heat transfer tubes or bending of the heat transfer fins. The present invention provides a method for manufacturing.

Means for Solving the Problems To solve the above problems, the manufacturing method of the present invention provides parallel A method of bending the assembly by inserting a substantially linear assembly consisting of heat transfer fins and heat transfer tubes from the inlet end between a pair of guide plates and moving the assembly between the pair of guide plates to the outlet. It is.

Effects of the present invention By the method described above, the heat transfer fins are evenly pressed from the outside at the bending portion, so that the force that bends the assembly of the heat transfer fins and the heat transfer tubes is not locally applied to the heat transfer tubes. Therefore, buckling does not occur and the heat transfer fins do not bend.

EXAMPLE Hereinafter, a manufacturing method according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a method of manufacturing a heat exchanger in one embodiment of the present invention. In FIG. 1, 11 is an assembly of heat transfer fins and heat transfer tubes, and 12 is a pair of guide plates parallel to each other. Information board 12
The inlet end is straight and the outlet end forms a curved portion 12'.

Reference numeral 13 denotes an insertion device for inserting the heat transfer fin and heat transfer tube assembly 11 between a pair of guide plates 12.

11' is a completed heat exchanger with a partially curved shape extruded from between a pair of guide plates. FIG. 2 shows a pair of guide plates 12
It shows the state of the assembly 11 of heat transfer fins and heat transfer tubes in the middle of the entrance and exit. 14 is a heat transfer fin;
16 is a heat exchanger tube, and 16 is a guide rail, which restricts the movement of the heat exchanger fin and heat exchanger tube assembly 11 in the length direction of the heat exchanger tube 16.

As described above, according to this embodiment, the assembly 11 of heat transfer fins and heat transfer tubes is inserted into the insertion device 13 between the pair of guide plates 12.
The tubes are inserted one after another and moved toward the inlet/outlet side while being pushed by the adjacent heat transfer fins and heat transfer tube assembly on the inlet side, during which time they are curved along a pair of guide plates.

Since the heat transfer fins 14 are evenly pressed from the outside at the bent portions, the force that bends the assembly of the heat transfer fins and the heat transfer tubes is not applied to the heat transfer tubes at the bends, and buckling and heat transfer fins are prevented from occurring. It is possible to manufacture a partially curved heat exchanger without the occurrence of bent parts.

Effects of the Invention As is clear from the above description, according to the present invention,
The assembly is curved by inserting and moving the linear assembly from the inlet end to the outlet end between a pair of guide plates, each of which has a straight inlet end and a partially curved outlet end. Because of this, it is possible to manufacture a heat exchanger that does not cause buckling or bending of the heat transfer fins unless the bending force is applied uniformly to the entire surface.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a method for manufacturing a heat exchanger according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the state of the heat exchanger during the manufacturing process in FIG. 1, and FIG. A perspective view of a completed product of the heat exchanger produced by the manufacturing method, FIG. 4 is a cross-sectional view of the main parts showing how the heat exchanger shown in FIG. 3 is installed in an air conditioner, and FIG. 5 is a front view of the conventional manufacturing device. , Figures 6 and 7
The figure is a partial sectional view of a curved portion of a heat exchanger manufactured by a conventional manufacturing method. 11...Assembly of heat transfer fins and heat transfer tubes, 1
2... Pair of guide plates, 13... Heat transfer fin and heat transfer tube assembly insertion device, 12'...
・Curved part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 11 - tr' of the 11 right U gloss finish tube - Part - i The history of the deterioration of each 72 - A pair of plans! 2'--Anterior part 13-m-Insertion device Fig. 1 Fig. 4 Fig. 5 n Fig. 6 Fig. 71! l

Claims (1)

[Claims] At least a plurality of heat transfer fins and the heat transfer fins are connected to each other from an inlet end between a pair of parallel guide plates whose spacing is kept substantially constant, an inlet end is straight, and an outlet end is partially curved. The method is characterized by inserting an assembly of substantially straight heat transfer fins and heat transfer tubes assembled from orthogonal heat transfer tubes and moving the assembly between the pair of guide plates to an outlet end, thereby bending the assembly. A method for manufacturing a heat exchanger.