JPH09119784A - Plate fin heat exchanger and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the formation of a wavy fin part while maintaining the heat transfer performance equivalent to that of the fin. SOLUTION: The fin members 12, 13 formed by obliquely setting the fluid flowing direction Y of a flat plate fin 11 are alternately disposed on a plate 14 to constitute the fins 20 of the respective layers so that a fluid channel 15 become zigzag. Thus, in the case of manufacturing the fin 20, the manufacture is facilitated as flat plate fin 11. When assembling as the fins 20 of the respective layers, the heat transfer performance equivalent to that of the wavy fin is obtained by so setting as to become alternately oblique fluid channels 15. The manufacture of the fin 20 is facilitated to increase the thickness of the fin material to increase the durability and improve the brazing properties and the fins 20 can be densified by improving the moldability of the fin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a plate fin heat exchanger and a method of manufacturing the plate fin heat exchanger, and is intended to improve performance and facilitate manufacturing by using a fin close to a wavy fin having good heat transfer characteristics. It is particularly suitable for space heat exchange.

[0002]

2. Description of the Related Art In a plate fin heat exchanger, a plate and fins are alternately laminated to form a heat exchanger core, and the heat transfer area per unit volume of the core can be made large, which is small and lightweight. It is used as a heat exchanger that requires higher efficiency and higher efficiency.

For example, plate fin heat exchangers are also used as heat exchangers for space, and due to restrictions in mounting space and mounting weight, further miniaturization and higher efficiency are required, and fins arranged in each layer are required. Some of the wavy fins are used. In the plate fin heat exchanger using the wavy fins, for example, as shown in FIG. 3, the plates 1 and the wavy fins 2 are alternately laminated, and the side bars 3 are arranged on both sides of the wavy fins 2 of each layer. The heat exchanger core 4 is formed, and two headers 5 are provided at both ends of the heat exchanger core 4 (front and rear portions in the flow direction of the corrugated fins), and fluid inlets 6A, 6 for the two fluids A, B are provided.
B and fluid outlets 7A and 7B are formed so that heat can be exchanged between the fluids A and B.

In the plate fin heat exchanger using such wavy fins, the plate 1 and the wavy fins 2 are manufactured by press molding or the like, and these are laminated to assemble the heat exchanger core 4 and the header. After mounting 5, the fluid inlets 6A, 6B and the fluid outlets 7A, 7B, the whole heat exchanger is put in a heating furnace and joined by brazing.

[0005]

However, as shown in the perspective view extracted in FIG. 3 (b), the wavy fin 2 is formed into a corrugated transverse cross-sectional shape and, at the same time, the direction of fluid flow of the fin (fin axis). The shape of (direction) Y also needs to be formed into a corrugated shape, which is technically difficult to form, and when it is attempted to form the high-density wavy fins 2 in order to improve heat transfer performance and reduce size and weight, it becomes more difficult to form. Since the plate thickness of the fin material of the corrugated fins 2 must be reduced, there is a problem that durability and brazing property are poor.

The present invention has been made in view of the problems of the prior art, and provides a plate fin heat exchanger in which the fin portion can be easily formed while maintaining the heat transfer performance equivalent to that of the wavy fin, and a manufacturing method thereof. Is what you are trying to do.

[0007]

In order to solve the above problems, a plate fin heat exchanger of the present invention is a plate fin heat exchanger in which plates and fins are alternately laminated, and the fins of each layer are The flat plate fins are alternately arranged obliquely in the fluid flow direction.

Further, according to the method of manufacturing the plate fin heat exchanger of the present invention, when the plate fin heat exchanger in which the plates and the fins are alternately laminated is manufactured, the plate fins are alternately arranged in the fluid flow direction. It is characterized in that fin members are cut out obliquely, and the fin members are alternately arranged so that the fins in each layer have a zigzag fluid flow direction.

According to this plate fin heat exchanger, fin members of each layer are formed by alternately arranging fin members whose plate fins are slanted in the fluid flow direction on the plate so that the fluid flow paths become zigzag. Therefore, when manufacturing the fins, it is possible to manufacture it as a flat plate fin to facilitate the manufacturing, and when assembling as fins of each layer,
By alternately forming oblique fluid flow paths, heat transfer performance equivalent to that of a wavy fin is ensured.

Further, according to the method for manufacturing the plate fin heat exchanger, the fin member whose fluid flow direction is slanted is cut out from the flat plate fin, and the slanted fluid passage of this fin member becomes zigzag in the fluid flow direction. In this way, the fins of each layer are formed alternately on the plate so that the fins can be manufactured as flat plate fins to facilitate the manufacturing process. The heat transfer performance equivalent to that of the corrugated fins is ensured by forming the fluid passages that are oblique and alternately close to the fins.

As a result of facilitating the manufacture of the fins, it is possible to increase the plate thickness of the fin material to increase the durability and the brazability, and to improve the formability of the fins. It is also possible to increase the density of fins.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a manufacturing process diagram according to an embodiment of a method for manufacturing a plate fin heat exchanger of the present invention, and FIG. 2 is a partial cutaway showing an embodiment of the plate fin heat exchanger of the present invention. FIG.

In the method of manufacturing the plate fin heat exchanger, as shown in FIGS. 1A and 1B, the flat plate fin 11 is first formed. The flat plate fin 11 has a corrugated transverse cross section, and the fin in the fluid flow direction Y is a linear fin. For example, the fin pitch is about 1 mm and the fin height is about 1.5 mm. . In this case, since the fin shape is a flat plate fin, the plate thickness of the fin material is from about 0.05 mm in the case of the wavy fin to 0.1 to 0.2.
Molding can be performed using a material having a thickness of about mm, and if the plate thickness of the fin material is 0.05 mm, the fin pitch and fin height can be reduced.

Next, from such a plate fin 11 as shown in FIG.
As shown in (a), plate fins are provided with rectangular fin members 12 and 13 having a width corresponding to the width of the heat exchanger core of the plate fin heat exchanger and having a length obtained by dividing the total length of the heat exchanger core into a plurality of pieces. The cutting is performed at an angle α to the front or the rear with respect to the fluid flow direction Y of. In this case, Fig. 1 (a)
As shown in FIG.
The fin member 12 inclined forward by an angle α with respect to the fluid flow direction Y of 1 and the fluid flow direction Y of the flat plate fin 11
On the other hand, the fin member 13 inclined backward by the angle α may be cut out, or the required number of fin members 12 (13) inclined in one direction may be cut out continuously.

As shown in FIGS. 1C and 1D, the fin members 12 and 13 cut out from the flat plate fin 11 in a rectangular shape are arranged on the plate 14 alternately with the fin members 12 and 13. A plurality of fluid channels 15 are arranged so as to be zigzag. Then, side bars 16 are arranged on both sides of the fin members 12 and 13 as in the case of a normal plate fin heat exchanger.

The side bar 16 includes a fin member 12,
The fin members 1 and 13 are not arranged in close contact with each other, and the flow paths 17 are formed on both sides of the fin members 12 and 13.
A flow that allows the fluid flowing out from 2 and 13 to the oblique outer side to flow into the front fin members 13 and 12 to the oblique inner side, and flows as it is without flowing into the front fin members 13 and 12. Protrusion 1 to prevent
8 is formed on the side bar 16.

Next, the heat exchanger core 19 is laminated using the plate 14, the fin members 12 and 13 and the side bar 16.

In this heat exchanger core 19, fin members 12 and fin members 13 are alternately arranged on a plate 14 to form a zigzag fluid flow path 15, and the fin members 12 and 13 are provided on both sides of the fin members 12 and 13. The side bar 16 is arranged so that the fins 20 of the respective layers are formed by the projections 18 so as to block the flow paths on both sides of each of the two fin members 12 and 13.

Then, the plate 14 and the fins 20 are laminated in a predetermined number of steps to form a heat exchanger core 19, and a header 21 and fluid inlets 22A and 22B are provided at both front and rear ends of the heat exchanger core 19 in the fluid flow direction Y. Fluid outlet 23A, 2
Install 3B.

After the assembly of the plate fin heat exchanger is completed in this way, the whole is placed in a heating furnace or the like and brazed and joined together to complete a plate fin heat exchanger 24 as shown in FIG.

According to the plate fin heat exchanger manufacturing method and the plate fin heat exchanger 24 as described above, since the fins 20 of each layer can be formed by the fin members 12 and 13 cut out from the flat plate fins 11, Compared with the production of the wavy fins, it is possible to greatly facilitate the forming, and it is possible to form using a fin material having a large plate thickness.
The durability can be improved, and the brazability can be improved by improving the rigidity.

Further, by reducing the lengths of the fin members 12 and 13 in the fluid flow direction, it is possible to secure the same heat transfer performance as that of the conventional wavy fins, and it is easy to mold the fin members. Therefore, the pitch and height of the fins can be reduced to achieve high density, which can improve heat transfer performance and reduce size and weight.

In the above-mentioned embodiment, the description has been given of the case where the present invention is applied to the double heat exchanger for exchanging heat between two fluids, but the invention is not limited to this type and the heat exchange between three fluids is performed. It can also be applied to a triple heat exchanger or the like.

Further, although a description has been given in which a gap is formed between the fin members to flow the fluid to the front fin member, the fin members may be arranged in close contact with each other.

[0025]

As described above in detail with the embodiment, according to the plate fin heat exchanger of the present invention, the fin members in which the fluid flow directions of the flat plate fins are inclined are alternately arranged on the plate. Since the fins of each layer are configured so that the fluid flow path becomes zigzag, when manufacturing the fins, the fins can be manufactured as flat plate fins to facilitate the production, and the fins of each layer can be assembled. At times, it is possible to ensure heat transfer performance equivalent to that of a wavy fin by alternately forming oblique fluid flow paths.

Therefore, by facilitating the manufacture of the fins, it is possible to increase the plate thickness of the fin material to increase the durability and the brazability, and at the same time, by improving the moldability of the fins, the fins are improved. It is also possible to increase the density.

Further, according to the method for manufacturing a plate fin heat exchanger of the present invention, a fin member having a slanted fluid flow direction is cut out from a flat plate fin, and an oblique fluid flow path of this fin member is zigzag in the fluid flow direction. Since the fins of each layer were formed by alternately arranging them on the plate so that
When manufacturing fins, it is easy to manufacture by manufacturing as flat plate fins, and when assembling as fins of each layer, the fluid flow equivalent to that of wavy fins is obtained by alternately forming diagonal fluid flow paths close to wavy fins. Thermal performance can be secured.

Therefore, by facilitating the manufacture of the fins, it is possible to increase the plate thickness of the fin material to increase the durability and the brazability, and the fins are improved in the moldability to improve the finability. It is also possible to increase the density.

[Brief description of the drawings]

FIG. 1 is a manufacturing process diagram according to an embodiment of a method for manufacturing a plate fin heat exchanger of the present invention.

FIG. 2 is an external perspective view showing a partly cutaway view of an embodiment of the plate fin heat exchanger of the present invention.

FIG. 3 is a structural explanatory view of a plate fin heat exchanger using conventional corrugated fins.

[Explanation of symbols]

 11 Flat Plate Fins 12 and 13 Fin Members 14 Plates 15 Fluid Flow Paths 16 Side Bars 17 Flow Paths 18 Projections 19 Heat Exchanger Cores 20 Fins 21 Headers 22A, 22B Fluid Inlets 23A, 23B Fluid Outlets 24 Plate Fin Heat Exchangers Y Fluids Flow direction α Fin member cutting angle

Claims (2)

[Claims] 1. A plate fin heat exchanger in which plates and fins are alternately laminated, wherein the fins of each layer are composed of fin members in which flat plate fins are alternately arranged obliquely in the fluid flow direction. A characteristic fret fin heat exchanger. 2. When manufacturing a plate fin heat exchanger in which plates and fins are alternately laminated, fin members are cut out from plate fins alternately obliquely with respect to the fluid flow direction, and these fin members are alternated. A method for manufacturing a plate fin heat exchanger, characterized in that the fins of each layer are formed so that the fluid flow direction is zigzag.