JPS5963494A - Heat exchanger - Google Patents

Abstract

PURPOSE:To obtain the device, small in size, light in weight and excellent in the property of heat exchange by a method wherein an internal fin is brazed to the inside of a meandering medium flowing tube formed by metallic plates while external corrugate fins are brazed to both sides of the straight part of the medium flowing tube. CONSTITUTION:The meandering medium flowing tube 24 of the heat exchanger 21 is formed by the metallic plates 22, 23 and the thickness of the plates in thin, therefore, the weight of the device may be lightened. The internal fin 25 is brazed to the inside of the medium flowing tube 24 while the external corrugate fins 26 are brazed to both sides of the straight part of the medium flowing tube 24, therefore, heat transmitting property between the medium flowing tube 24 and both fins 25, 26 is increased and the heat exchanging property may be improved. A heat transmitting rate, which accompanies the evaporation, condensation and the like, may be improved, the flow of the medium may be uniformized and the performance of the heat exchanger may be improved.

Description

[Detailed Description of the Invention] This invention provides room coolers, car coolers, oil coolers,
It relates to heat exchangers used in coolers, etc.

Conventionally, as this type of heat exchanger, those shown in FIGS. 1 to 4 have been used. The heat exchanger (1) shown in Fig. 1 has a plurality of straight media flow pipes (3) in holes drilled in a large number of notebook fins (2) arranged in parallel at predetermined intervals. The tube (3) is expanded, the fin (2) and the tube (3) are fixed, and the U-shaped bent tube (4
), only 4 is in communication with the end of the medium flow Jl pipe (3). In this heat exchanger (1), the plates and fins (2) and the medium flow pipes (3) are mechanically connected, so the heat transfer performance in both is poor, and it is difficult to obtain the required heat exchange performance. needed to increase the overall size. Furthermore, there was also the problem of high ventilation resistance. Heat exchanger (5) shown in Figures 2 and 3
A corrugated fin ( 7) is arranged, Corge) - Fin (7)
is soldered to the medium flow pipe (6).

In this heat exchanger (5), the medium flow pipe (6) and the corrugated fins (7) are joined metallically, so the heat transfer performance between them is excellent and it is possible to achieve miniaturization. Become. However, since the flat tube is extruded, its wall thickness cannot be made thinner, and its weight increases. The heat exchanger (8) shown in FIG. 4 is a so-called laminated heat exchanger, and by stacking a plurality of press-molded plates (9) in a layered manner, a plurality of medium flow pipe sections are formed. (10) are formed in parallel and in communication with each other, and corrugated fins (11) are disposed between the medium flow pipe parts (10) and are brazed together. The flow pipe section (10) has a header section (12) provided at both ends in one direction with the plate (9).
It is communicated via. In this heat exchanger (8), 1. The flow pipe section (10) and the corrugated fin (
1j) are metallically joined, the heat transfer performance between them is excellent, and miniaturization can be achieved.

In addition, the flow pipe section (10) is made of a press-molded plate (
9), the wall thickness can be reduced. However, since it is extremely troublesome to add or modify the height of the header section (12), this height is generally lowered to reduce the distance between the flow pipe sections (1o). There was a problem in that the number of tube parts (1o) increased and the weight increased.

This invention was made in view of the actual situation described in 1.
The purpose is to provide a heat exchanger that is small and lightweight and has excellent heat exchange performance.

The heat exchanger according to the present invention includes a meandering medium flow pipe made of a metal plate, and an external corrugated fin brazed to the outer surface of the medium flow pipe.

In the above, the medium flow pipe is formed by one or two metal plates. If it is formed from a single metal plate, it is bent at the center in the width direction and joined at the mating edges. Use press-formed recesses, rising walls, and grooves to facilitate bending.

If it is formed from two metal plates, it may have a small recess (a recess for forming a medium flow part in one of the metal plates,
Press-form the rising walls, etc. Examples of press molding include mold surface processing and roll forming.

As the internal fin, for example, one having a corrugated cross section is used. . Preferably, holes are provided near the tops of the peaks and near the bottoms of the valleys of the internal fins. By doing so, when the internal fin is bent into a meandering shape, it is possible to prevent the internal fin from being deformed at the bent portion due to the presence of the hole, and to prevent cracks from forming at the bent portion. Moreover, the deformation of the internal fins at the curved portions can prevent the distance between the inner surface of the tube and the internal fins from becoming so large that brazing is impossible.

Furthermore, when this heat exchanger is used in a car cooler or the like, such internal fins greatly contribute to improving the heat transfer coefficient accompanied by evaporation, condensation, etc. of the refrigerant.

Preferably, the external corrugated fins are provided with a number of louvered ridges.

According to the heat exchanger of the present invention, since the medium flow pipe is formed from a metal plate, the wall thickness of the heat exchanger can be minimized compared to an extruded pipe. ,
Weight reduction can be achieved. Also, since the internal fins and external corrugated fins are soldered to the media flow pipe, heat transfer between the internal fins and the media flow pipe and between the external corrugated fins and the media flow pipe is improved. Moreover, the heat exchange performance is also excellent. Furthermore, the presence of internal fins improves the heat transfer coefficient accompanying evaporation and condensation of the medium, and also equalizes the flow of the medium, thereby achieving high performance. Therefore, it is possible to downsize the heat exchanger. Furthermore, material costs, processing costs, etc. can be reduced, and an inexpensive heat exchanger can be provided.

This invention will be explained below based on drawings showing embodiments.

In FIGS. 5 to 7, the heat exchanger (21) is
A meandering media flow pipe (24) formed from two metal plates (22 + +231) and an internal fin (
25) and external corrugated fins (2G) arranged on both sides of the straight portion of the medium flow pipe (24) and brazed to the outer surface of the pipe (24).

Both metal plates (22) +23+ consist of a 7/L/minium brazing sheet coated on both sides with brazing material.

Both metal plates (22+ +231 have press-molded recesses (27+ +28+) for forming medium flow portions, and rising edges (22a) (23a) are press-molded on both sides of the recesses (27+ +28+).Medium flow pipes ( 24) is formed by stacking the grooves of two metal plates (22) so that the recesses (2ηt28t) face each other, fixing them with a fixing member (29), and soldering them. The fixing member (29) is a long one disposed over the entire length of the pipe, and metal plates (22) are attached to both side edges of the fixing member (29).
(A clamping part (29a) is provided for clamping the rising edges (22a) and (23a) of the fixing member (231).
The base (29L+) of 29) is provided with a number of holes (30) at predetermined intervals in the longitudinal direction. At both ends of the medium distribution pipe (24), there are headers +31) f32.
) are taken in a continuous form f-J.

The internal fin (25) is made of an aluminum plate with a corrugated cross section formed by roll forming, and has a large number of holes (33) at the tops of its peaks and the bottoms of its valleys.

The external corrugated fins (26+) are made of an aluminum plate formed by roll forming, and are provided with a large number of louvered cut-outs (not shown). Also,
1. Side plates (34) for protecting the corrugated fins (261) arranged on the outside are soldered to the straight parts at both ends of the medium flow pipe (2IJ).

Such a heat exchanger 011 is assembled, for example, by the following method. First, the metal plates (22+ +231) with the recesses t27) +28+ and the rising edges (22a) and (23a) press-formed and before being bent into a serpentine shape are stacked with the internal fins (25) interposed therebetween; Fixed member (2
9) to fix both. Then, both metal plates +22
) (Bend 23+ into a meandering shape and place external corrugated fins (26+ and header +31) between the straight parts and outside the straight parts at both ends.
(32) and side play) t34). After that, put it in a vacuum furnace and metal plate (22) +23
+ At the same time as forming the tube (24) by brazing them together,
Internal corrugated fins (26j) and tubes (2a; external corrugated fins (26j) and tubes (251).

Header (311+32), pipe (24), and side
Braze the plate (34) and tube (24). In this way, a heat exchanger (:a) is created. header f31
) +321 does not necessarily need to be brazed at the same time as the others.

In the above, the metal plates +221 and +231 are made of forming nuts, and the internal fins (25) and the external corrugated fins (26) are made of aluminum plates that do not contain brazing material, which is an advantageous configuration against corrosion. , but is not limited to this.

In addition, in the above, the base (2g
Since a large number of holes (3o) are drilled in b), volatile substances are easily scattered to the outside, and a better joining by brazing can be obtained, but the holes (3o) are not necessarily required. Furthermore, in the above.

The metal plate +22+ (23), internal fins (25), and fixing member (26) can all be manufactured continuously by roll forming, and the work of combining them is also
Each can be performed in a continuous line.

Therefore, production work can be performed efficiently and processing costs can be reduced.

A variation of the media flow tube in the vessel is shown.

A plurality of medium flow pipes (4]) shown in FIG. 8 are used at predetermined intervals in the longitudinal direction.

The medium flow pipe (43) shown in FIG. 9 is made by bending a single metal plate (44) at the center of its width. This is what I did. As shown in Fig. 110, the metal plate (44) has a vertical wall f on one of its both sides.
45) and the protruding edge (4G) leading to the second grade of the rising wall (45), the metal plate (44) is bent at the center in the width direction. Finally, a gate ?7i (
47) is used which is pressed TI type. Then, the metal plate (44) or the concave groove (47) is bent, and the joined edges are caulked (11) and soldered.
; J will be done. Alternatively, the caulked portion may be bent upward as shown by the chain line.

The medium flow pipe (48) shown in FIG. As shown in FIG. 12, the metal plate (49) has a recess for forming a medium circulation part (
50) and the hanging edges (51) on both sides are press-molded, and a groove (52) for obtaining a predetermined thickness of the medium flow pipe (48) when bent is press-molded. used. Then, this metal plate (49) is bent over the gate structure (52) and then fixed by the fixing part assembly (29) and brazed.

Furthermore, the medium flow pipe may be formed from a metal plate press-formed into the required shape to form the medium flow portion, and may be of the shape shown in the above embodiments and modifications. is not limited.

[Brief explanation of the drawing]

1 to 4 show three conventional examples, FIG. 1 is a side view of the first conventional example, FIG. 2 is a side view of the second conventional example, and FIG. 3 is a side view of the second conventional example. An enlarged cross-sectional view taken along the mm-m line of
FIG. 4 is a side view showing a third conventional example. 5 to 12 show embodiments of the present invention, and FIG.
The figure is a perspective view, Figure 6 is an enlarged view of the t zso group, and Figure 7 is a part of the media flow pipe 9J.
FIG. 8 is a perspective view showing a modified example of the medium flow pipe, FIG. 9 is a cross-sectional view showing another modified example of the medium flow pipe, and FIG. 10 is a cross-sectional view of the medium flow pipe shown in FIG. 9. FIG. 11 is a cross-sectional view of a metal plate used to form the medium flow pipe, and FIG. 12 is a cross-sectional view showing still another modification of the medium flow pipe. FIG. 3 is a cross-sectional view of a metal plate. °”) °°°m 2 m +H゛(2a 1231
(441(49) °°°M F': 'El ゛(2
4) (41) Gloss) (43〆...media distribution pipe, +251...internal fin, (26)...external corrugated fin.

Claims (1)

[Claims] Meandering medium 2+1f passage pipe f24+ (4) formed from metal plates (22+ +23) +44) (119)
]) +43) +48+ and media flow pipe f2a +4
11 +43+ (48)
41+4++ +43) (48) Inner surface (Korou f:]
and placed on the wire part [F] @ side, and the pipe +241 +
41+ +43) Heat exchanger consisting of external corrugated fins (26) brazed at f, 181 f=1.