JPH0125914Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to fins used in plate-fin type heat exchangers, and relates to fins for heat exchangers that significantly reduce the amount of fin material used and improve heat transfer efficiency.

Heat exchangers are often constructed with fins fixed between two flat plates by brazing or other means to serve as a reinforcing material and to expand the heat transfer area, and fins come in a wide variety of shapes. has been done. For example, as shown in FIG. 1, a configuration in which side bars 2 are arranged at both ends of two flat plates 1, and wave-shaped louver fins 3 having a large number of notches are inserted and fixed therebetween is often used.

This wave-shaped louver fin 3 has a structure in which a fin row in which a large number of consecutive peaks 3a and troughs 3b are arranged is alternately shifted slightly from the neighboring fin rows with the peaks or valleys, and is molded from the fin material 4. As shown in Figure 2, this requires a complex-shaped upper blade 5 and lower blade 6 that combine L-shaped blades, resulting in large blade wear, poor molding efficiency, and high cost. . Moreover, if the opening width of the flat plate 1 is l in order to form a corrugated shape, the corrugated louver fin 3 to be inserted here requires a length of 2l of fin material, and as shown in FIG. 3b is flat plate 1
This part is not useful for expanding the heat transfer area and results in wasted material and high costs.

Therefore, this invention significantly reduces the amount of material used compared to the above-mentioned corrugated louver fin.
The objective is to create fins for heat exchangers that are easy to mold and have good heat exchange efficiency.

In other words, this idea is based on a fin for a heat exchanger that is interposed between two flat plates and fixed together by brazing or the like. A plurality of cut and raised fin portions are vertically cut and raised in the vertical direction to be perpendicular to the fin material substrate, and the cut and raised fin portions are arranged parallel to the fluid flow direction. This is a fin for a heat exchanger in which a plurality of rows of raised fin portions are arranged in the fluid flow direction.

Furthermore, to explain the fin according to this invention in detail based on the drawings, FIG. 3 shows a case where a large number of I-shaped cuts are arranged in parallel in the fin material, and the rectangular fin portion 13a between the cuts is cut in the vertical direction. When raised, a large number of continuous rows of fin portions 13a having the same height are formed around the substrate 13b. If the interval between the cuts is made equal to the height of the side bar 12 inserted between the ends of the two flat plates 11, the cut and raised fin portions 13a will come into contact with the upper and lower flat plates 11 and constitute heat exchanger fins. That is, the cutting width of the fin portion 13a may be determined in accordance with the opening height between the flat plates 11 of the heat exchanger.

In order to produce the cutting and raising fins 13 in which the fin portions 13a are continuous, for example, as shown in FIG. A cut is made in the fin material 14 using the lower blade 16 and the fin material 14 is then raised vertically and cut out perpendicularly to the fin material 14.
For example, match the width l of the fin material 14 to be processed with the opening width l of the heat exchanger, cut and raise a predetermined number of rows of fin parts 13a in the width direction of the fin material 14, and then continue to form the fin parts at regular intervals. The cut and raised fins 13 can be easily produced by cutting and forming rows 13a in the length direction of the fin material 14 and cutting the fin material 14 according to the passage length of the heat exchanger. As shown in FIGS. 5 and 6, this cut and raised fin 13 is sandwiched between two flat plates 11, and a side bar 12 that matches the height of the fin part 13a is placed on the flat plate 11 parallel to the fin part 13a.
When placed on both ends of the fins 13 and fixed together by brazing or the like, a predetermined number of fins 13 are attached to the opening.
a are arranged in parallel, and a plurality of rows of fin portions 1 are arranged in the length direction of the passage.
The heat exchanger passages are lined up in rows 3a. The arrangement of the plurality of rows of fin portions 13a may be arbitrary, such as arranging the fin portions 13a so that they are lined up in a straight line in the length direction of the passageway, or arranging them in a staggered manner so that the fin portions 13a are alternately shifted from row to row. , fin portion 13a
The direction of cutting and raising is also arbitrary.

In either case, by cutting and raising the fins 13, for example, the substrate 13b of the fin material located at the center of the height of the fin portion 13a is ensured between the front fin portion row and the rear fin portion row. The swirling flow in the passage direction is likely to occur in the fluid passing between the fin portions 13a, and together with the increase in the heat transfer area due to the cut and raised fins 13, the heat transfer efficiency is significantly improved.

As described above, when the heat exchanger fins of the present invention are fixed together with other members by brazing, the upper and lower ends of the fin portions 13a are completely brazed to the inner wall surfaces of the flat plates 11, 11, so that the cut-up fins 13 also acts as a reinforcing material for the space forming the passage surrounded by the flat plates 11, 11 and the side bars 12, 12, greatly improving the pressure resistance of the heat exchanger, and is effective as a fin for a heat exchanger for high-pressure fluid. It is.

In addition, as mentioned above, since the fin is constructed by cutting and raising the fin part on the fin material made of a flat plate,
The same opening width l can be obtained with the same fin material width l, the fin material used is half that of conventional corrugated louver fins, and the blade for cutting and forming has a simple structure, reducing wear. It is small and has good molding efficiency, and has excellent productivity in terms of both the materials used and moldability.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a heat exchanger using conventional corrugated louver fins, Fig. 2 is a perspective view illustrating the process of forming the corrugated louver fins, and Fig. 3
Figure 4 is a perspective view showing the cutting and raising fins according to this invention, Figure 4 is a longitudinal sectional view of the blade for forming the cutting and raising fins according to this invention, and Figure 5 is a partially broken plane of a heat exchanger using the cutting and raising fins. FIG. 6 is a partially cutaway enlarged front view of FIG. 5. In the figure, 11...Flat plate, 12...Side bar, 1
3...Cut and raise fin, 13a...Fin part, 1
3b...Substrate, 14...Fin material, 15...Upper blade, 16...Lower blade.

Claims (1)

[Scope of utility model registration request] In heat exchanger fins that are interposed between two flat plates and fixed together by brazing, etc., the fin material surface has a plurality of slits arranged in parallel at intervals equivalent to the distance between the flat plates, and is cut and raised in the vertical direction centering on the fin substrate. A plurality of cut and raised fin portions are arranged in parallel perpendicular to the fin material substrate, and the cut and raised fin portions are arranged parallel to the fluid flow direction, and the plurality of parallel cut and raised fin portion rows are arranged in parallel. Heat exchanger fins arranged in multiple rows in the direction of fluid flow.