JP2003302190A - Corrugated fin type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrugated fin type heat exchanger in which a fluid to be cooled 10 flows in a plurality of passes, capable of precluding a heat transfer from one side of a core to the other side at the boundary where the fluid is turned back. <P>SOLUTION: The corrugated fin type heat exchanger is structured so that a partitioning part 5 is provided on its header 4, and a heat insulating plate 6 is installed inside the core 3 in the position of the partitioning part 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a core is arranged between a pair of headers and a fluid flows in a zigzag manner in the core in multiple passes.

[0002]

2. Description of the Related Art A multi-pass heat exchanger is known as a means for further lowering the temperature of a fluid to be cooled. This is one in which a core is arranged between a pair of headers, a partition is provided in a part of the header in the longitudinal direction, the fluid to be cooled is introduced from one side of the partition, and the pair of headers is folded back to meander. The flow path of the fluid is lengthened by circulating the fluid in the shape of a circle.

[0003]

In such a multi-pass heat exchanger, the temperature of the fluid flowing through the tube on the inlet side of the fluid at the position of the partition is the temperature of the fluid flowing through the outlet. Will be higher than. Then, heat is transferred from the high temperature side tube to the low temperature side tube via the fins, and the heat dissipation effect is reduced on the downstream side. As described above, the fluid is meanderingly flowed, repeated a plurality of times, and when it reaches the outlet of the heat exchanger, there is a drawback that sufficient heat exchange performance cannot be exhibited. Then, this invention makes it a subject to solve such a problem.

[0004]

The present invention according to claim 1 has a large number of flat tubes (1) juxtaposed in parallel with each other at regular intervals, and corrugates are provided between adjacent flat tubes (1). In a corrugated fin type heat exchanger comprising a core (3) having fins (2) arranged and a pair of headers (4) communicating with both ends of each flat tube (1), at least one header ( A partition (5) that divides the inside of the header is provided in the middle in the longitudinal direction of 4), and one of the headers is divided.
The fluid introduced into (4) is configured so as to fold back and flow between the pair of headers as a whole, and the heat insulating plate (6) is placed inside the core (3) at the position of the partition (5). tube
It is a corrugated fin type heat exchanger characterized by being interposed in parallel with (1).

According to a second aspect of the present invention, in the first aspect, the header (4) comprises a header plate (4a) and an elongated box-shaped header body (4b) fitted on the header plate (4a). The corrugated fin type heat exchanger has a bent portion (7) for absorbing heat stress formed on the header plate (4a). A third aspect of the present invention is the corrugated fin type heat exchanger according to the first or second aspect, wherein the flat tube (1) has a bent portion (1a) for absorbing thermal stress.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a corrugated fin type heat exchanger of the present invention, and FIG. 2 is an enlarged view of a II portion thereof. In this heat exchanger, a core 3 is arranged between a pair of headers 4. In the core 3, a large number of flat tubes 1 are arranged in parallel at regular intervals and are adjacent to each other.
Corrugated fins 2 are arranged respectively between them, and the both are fixed by means such as brazing. Each header 4
Consists of a long and narrow box-shaped header body 4b having an opening at one end and a header plate 4a for closing the opening in a liquid-tight manner.

In the header 4, two partition parts 5 on the upper side in FIG. 1 are arranged apart from each other in the longitudinal direction thereof, and the partition part 5 is arranged at the center position of the lower header 4 in the longitudinal direction. . A heat insulating plate 6 is arranged instead of the flat tube 1 at the position where each partition 5 is arranged. The heat insulating plate 6 may be, for example, a ceramic thin plate having a metal bonded to both sides by vapor deposition or rolling. The bent portion of the corrugated fin 2 can be brought into contact with the surface, and the contact portion can be joined by brazing or soldering.

An end of the inlet pipe 8 is connected to one end of the upper header 4 and one end of an outlet pipe 9 is connected to the other end. Then, the fluid 10 to be cooled flows in from the inlet pipe 8 and flows down the flat tube 1 in the right part of the core 3 and makes a U-turn in the header 4 at the lower end, and the flat tube 1 in the right part of the partition 5 in the center thereof. And the U-turn is made again at the upper header 4 so that the fluid 10 to be cooled circulates in the meandering manner in each part of the core 3. A fan or the like (not shown) is provided facing the core 3, and cooling air is circulated to the outer surfaces of the flat tubes 1 and the corrugated fins 2 to exchange heat with the fluid to be cooled 10. The temperature of the cooled fluid 10 decreases toward the downstream side while flowing in a meandering shape. Since the heat insulating plates 6 are respectively present at the boundary positions, it is possible to prevent heat from moving in portions having different temperature differences.

Next, FIG. 3 is a plan view of an essential part of the header plate 4a, and FIG. 4 is a schematic sectional view taken along the line IV-IV of FIG.
In this example, a bent portion 7 having a U-shaped cross section is formed around the tube insertion hole of the header plate 4a. This is because the flat tube 1 in each part of the core has different thermal expansion as the fluid temperature of the fluid 10 to be cooled is different in each part of the core, so that the thermal stress is absorbed. That is, the bent portion 7 facilitates the expansion and contraction of the flat tube 1.

The cross section of the bent portion 7 is a cross section V as shown in FIG.
You may form in a character shape. Further, as shown in FIG. 6, a bent portion 7 in which the entire header plate 4a is corrugated may be formed to facilitate the deformation of each portion of the header plate 4a. Further, as shown in FIGS. 7 and 8, a bent portion 1a may be formed at the root portion of the flat tube 1 so that the flat tube 1 itself can expand and contract to some extent.

[0011]

The corrugated fin type heat exchanger of the present invention is provided with a partition 5 for dividing the corrugated fin type heat exchanger in the middle of at least one of the headers 4 so that the fluid flows back between the pair of headers as a whole. Thus, the heat insulating plate 6 is interposed in the core 3 at the position of the partition portion 5. In such a heat exchanger, the fluid temperature on one side of the core differs from the fluid temperature on the other side at the boundary where the fluid flows back. In the present invention, the presence of the heat insulating plate 6 at the boundary can prevent thermal influence between the two. That is, the front surface side and the back surface side of the heat insulating plate 6 have different directions of the fluid flowing in the respective flat tubes 1 and a temperature difference occurs between the two, but due to the existence of the heat insulating plate 6 as the boundary, the temperature difference between the two is generated. It is possible to improve the heat exchange performance by blocking the influence of. Further, the heat exchanger as a whole can be made compact as the heat exchange performance is improved.

In the above structure, the bent portion 7 for absorbing thermal stress can be formed in the header plate 4a of the header 4. In that case, it is possible to provide a heat exchanger having high durability by absorbing the thermal stress caused by the temperature difference between the respective cores with the partition 5 as a boundary.

[Brief description of drawings]

FIG. 1 is a front view of a corrugated fin type heat exchanger of the present invention.

FIG. 2 is an enlarged view of part II in FIG.

FIG. 3 is a plan view showing an example of a header plate 4a used in the heat exchanger.

4 is a schematic cross-sectional view taken along the line IV-IV of FIG.

FIG. 5 is a vertical cross-sectional view showing another example.

FIG. 6 is a schematic vertical cross-sectional view showing another example of the header plate 4a.

FIG. 7: Bent portion 1a on the flat tube 1 of the heat exchanger
FIG.

8 is a schematic cross-sectional view taken along the line VIII-VIII of FIG.

[Explanation of symbols]

1 Flat tube 1a Bent part 2 corrugated fins 3 core 4 header 4a header plate 4b header body 5 dividers 6 heat insulation board 7 bent part 8 inlet pipes 9 Exit pipe 10 Cooled fluid

Claims (3)

[Claims] 1. A core (3) having a large number of flat tubes (1) arranged in parallel at regular intervals, and corrugated fins (2) arranged between adjacent flat tubes (1), respectively. A pair of headers that connect the ends of each flat tube (1)
In a corrugated fin type heat exchanger comprising (4) and (4), at least one header (4) is provided with a partitioning part (5) dividing the inside of the header (4) in the longitudinal direction. The fluid introduced into (4) is configured so as to fold and flow between the pair of headers as a whole, and the heat insulating plate (6) is placed in the core (3) at the position of the partition (5).
A corrugated fin type heat exchanger, characterized in that it is interposed in parallel with the flat tube (1). 2. The header according to claim 1, wherein the header (4) is composed of a header plate (4a) and an elongated box-shaped header body (4b) fitted on the header plate (4a). Bent part for absorbing thermal stress
A corrugated fin type heat exchanger having (7) formed therein. 3. The bent portion (1a) for absorbing thermal stress according to claim 1 or 2, wherein the flat tube (1) is bent.
A corrugated fin type heat exchanger in which is formed.