JPH0149569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method designed to automatically and integrally assemble corrugated fins and meandering heat exchanger tubes.

In compact heat exchangers such as car air conditioners and radiators, those having a structure in which corrugated fins are interposed between meandering heat transfer tubes are most commonly used. As shown in FIG. 1, which shows the appearance of this corrugated heat exchanger, a connection union 2 is integrally fixed to the end of the heat exchanger tube 1 by brazing, and the heat exchanger tube 1 has a bend portion. (bent pipe part) are bent 180 degrees alternately and meander as if sandwiching the corrugated fin 4. Heat exchanger tube 1
and the corrugated fins 4 are integrated by brazing at the top of the corrugated fins 4, so that the heat medium flowing in the heat transfer tube 1 exchanges heat with the air passing through the corrugated fins 4.

By the way, when assembling corrugated fins to heat transfer tubes, normal corrugated fins are extremely flexible and easily bend and twist, so it is difficult to transport or hold them alone, and currently it is difficult to carry them by hand. Assembly is being carried out through work. As a result, the pitch of the corrugated fins in conventional products tends to be uneven, leading to a decline in heat transfer performance and product value.In addition, the assembly time is long compared to the labor involved, and the production cost is high. .

The present invention has been made in view of various drawbacks in assembling heat exchanger tubes and corrugated fins in conventional corrugated heat exchangers, and an object of the present invention is to provide a new method that enables automatic assembly work. .

The structure of the method for manufacturing a heat exchanger tube with corrugated fins of the present invention that achieves this objective is to fold the heat exchanger tube in opposite directions by less than 180 degrees at each fixed length to form a straight pipe portion and a curved pipe portion. Next, a corrugated fin is interposed between the mutually adjacent straight pipe portions, and then these are connected to the other ends of a pair of guide rails in which one end is parallel to each other and the distance gradually increases toward the other end. The straight pipe parts are deformed parallel to each other and the corrugated fins are thereby compressed, and in this state they are vibrated to reduce the distance between the tops of the corrugated fins. The present invention is characterized in that the corrugated fins are made uniform and further compressed by a certain amount together with the heat transfer tubes to integrate them.

Hereinafter, FIG. 2a showing the working principle of an embodiment of the method for manufacturing a heat exchanger tube with corrugated fins according to the present invention and FIG.
This will be explained in detail with reference to FIG. b. The meandering tube forming section 12 set on the work base 11 has a pair of bending pieces 14a and 14b that bend the straight heat exchanger tube 13 fed therein in opposite directions by less than 180 degrees every certain length. are provided, and these bending pieces 14a, 14b semi-revolution around the other. That is, after a certain amount of heat exchanger tube 13 is supplied forward from these bending pieces 14a and 14b, one bending piece 14a semi-revolutions around the other bending piece 14b and bends heat exchanger tube 13 to nearly 180 degrees. One of the bending pieces 14a is reversely rotated half a revolution again to the original position. Next, when the heat exchanger tube 13 is sent out again and moves forward by a certain amount, the other bending piece 14b semi-revolutions in the opposite direction around the one bending piece 14a and bends the heat exchanger tube 13 in the opposite direction to nearly 180 degrees. , the other bending piece 14b is half-rotated again to its original position. In this manner, the above-described procedure is repeated to produce a meandering heat exchanger tube 13 consisting of a curved tube portion 13a and a straight tube portion 13b that is not parallel to each other. A pair of guide rails 15 are placed on the work base 11 in front of the meandering tube forming section 12 and are spaced apart from each other toward one end opposite to the meandering tube forming section 12 (on the right side in FIG. 2a). Guide rail 1
A pair of mutually parallel movable guide rails 16 are connected to one end of the guide rail 5 . A vibrator 17 is attached to each of the movable guide rails 16, and the movable guide rails 16 can be moved toward and away from each other while remaining parallel to each other by a drive source (not shown). Heat exchanger tubes 1 of the meandering tube forming section 12 are placed on the work base 11.
3 to a stopper 18 that slides into contact with one end of the movable guide rail 16, and a traction arm 19a is attached to this transport rod 19, which locks onto the curved pipe portion 13a and whose spacing can be changed. It is being Meandering tube forming part 1
The heat exchanger tube 13 cut off by the cutter 20 provided in front of the tube 2 is drawn into the guide rail 15 by the conveyor rod 19 and slides on the guide rail 15, and then gradually moves to the traction arm 19a.
When the distance between the straight pipe portions 13b reaches the inside of the movable guide rail 16, the straight pipe portions 13b are deformed so as to be parallel to each other. A fin stacker 22 in which a large number of corrugated fins 21 are housed in a compressed state is installed above the other end (left side in the figure) of the guide rail 15. Below this fin stacker 22, heat transfer tubes 1
3, the corrugated fins 21 of the mutually adjacent straight pipe portions 13b are dropped. A holding plate 19b that can press the corrugated fins 21 against the curved pipe portion 13a is attached to the transport rod 19 so as to be able to reciprocate in the transport direction of the heat transfer tube 13, and as the transport rod 19 moves toward the stopper 18, The corrugated fin 21 is gradually pressed toward the bent pipe portion 13a. Therefore, when the curved tube portion 13a at one end of the heat transfer tube 13 is pulled in by the conveyor rod 19 until it comes into contact with the stopper 18, the straight tube portion 1
3b is deformed and the corrugated fin 21 is compressed, so that the top portion thereof lightly contacts the straight pipe portion 13b. By operating the vibrator 17, the corrugated fin 21 resonates, the stress applied to the corrugated fin 21 is uniformly diffused, and the pitch of the top is corrected to a constant value. After this operation or in parallel with this operation, the movable guide rails 16 are brought close to each other by a certain amount, and the heat exchanger tubes 13 and The corrugated fins 21 are compressed. After that, transport rod 1
9 is pulled upwards and the brazing jig 23 provided inside the movable guide rail 16 is held together with the heat transfer tube 13 and the corrugated fin 21 by a holding member (not shown), and the brazing work begins. is the groove 1 formed in the movable guide rail 16
6a.

As described above, according to the method for manufacturing a heat exchanger tube with corrugated fins of the present invention, the heat exchanger tube is bent so that the interval between adjacent straight tube portions is wider than the height (width) of the corrugated fins. Corrugated fins can be inserted easily and reliably. In addition, since the heat transfer tubes and corrugated fins are slid against the tapered guide rails, the heat transfer tubes can be accurately deformed into a predetermined shape, and the twisting and bending of the corrugated fins can be automatically corrected. Correctable. Furthermore, by vibrating the heat transfer tubes and the corrugated fins, the pitch of the corrugated fins can be made uniform, and a high-quality product can be obtained at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing the external appearance of a heat exchanger tube with corrugated fins, FIG. 2a is a manufacturing principle diagram showing the working process of an embodiment of the method for manufacturing a heat exchanger tube with corrugated fins according to the present invention, and FIG. 2b is that B-B
This is a sectional view taken in the direction of the arrow, and the symbols in the figure are: 13 is a heat exchanger tube, 13a is a curved tube portion, 13b is a straight tube portion, 14a and 14b are bending pieces, 15 is a guide rail, 16 is a movable guide rail, and 17 is a vibration tube. vessel, 1
9 is a transport rod, 19a is a traction arm, 19b is a holding plate, 21 is a corrugated fin, and 22 is a fin stacker.

Claims (1)

[Claims] 1. Fold the heat exchanger tube in opposite directions by less than 180 degrees every certain length to form a straight tube portion and a curved tube portion, then interpose corrugated fins between the adjacent straight tube portions, and Thereafter, these are inserted from the other end of a pair of guide rails whose one end is parallel to each other and the distance gradually increases toward the other end, and slid to the one end, so that the straight pipe portions are parallel to each other. The corrugated fins are deformed and compressed, and in this state, they are vibrated to make the distance between the tops of the corrugated fins uniform, and the corrugated fins are further compressed together with the heat transfer tube by a certain amount. A method for manufacturing a heat exchanger tube with corrugated fins, characterized in that the heat exchanger tube is integrated.