JPS6213993A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide a heat exchanger whose pressure loss is low, while heat transfer area is large, whose size can be miniaturized, and mechanical intensity is high, by flowing both fluids in the direction of ribs of corrugated fins, in a heat exchanger of cross flow type being curved in an arc. CONSTITUTION:A corrugated fin 7 is a serration-type fin with its ribs formed staggeredly in the longitudinal direction 'L', that is the direction of ribs. The fin 7 is formed in such a manner that its rib part 8 is cut off by every unit length 'd' in the longitudinal direction with the bottom part 9 of each rib 8 being left unseparated, and the cut ribs are curved to the bottom side 9 in accordance with the curvature 1/R of a core part. They are placed between bulkheads 1, 1, with its direction of rib 'L' being set in accordance with the circumferential direction 'A' of a core part. In such a structure, a fluid flowing to the circumferential direction 'A' in the other fluid passage 3 circulates in the direction of rib of a corrugated fin 7. Pressure loss by fins 7 is made low, accordingly the pitch of corrugation can be narrowed. The heat transfer area can be increased, the heat exchanging efficiency can be increased, and a heat exchanger itself can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arcuate cross-flow type heat exchanger.

[Conventional technology]

The arc-shaped heat exchanger along the outer peripheral surface of the arc-shaped device is of the so-called cross-flow type, in which one fluid flows in the circumferential direction and the other fluid flows in the axial direction, in terms of heat transfer efficiency. FIG. 8 shows the core portion of an air-cooled oil cooler, which is one of the conventional heat exchangers of this type.

The core part has one fluid passage between the partition plates (1) (1).
21 and the other fluid passage (3) are alternately formed, and the entire core portion is curved in an arc shape with a required radius R. Therefore, the circumferential direction of this arc-shaped core portion is A, and the circumferential direction A is
If the circumferential longitudinal direction perpendicular to is represented by B, one fluid passageway (2) is an air passageway communicating with the entire air longitudinal direction B. The corrugated fins (4) provided in this air passage (2)
) is arranged so that the ribs are oriented in the longitudinal direction B and the continuous direction of the waveforms is aligned with the circumferential direction A from the viewpoint of the air flow direction and the curving process.

(5) is a spacer bar provided at the circumferential end of the air passage (2).

On the other hand, the other fluid passage (3) is an oil passage,
The oil is moved in the local direction AK perpendicular to the air flow direction (longitudinal direction B).
There are arc-shaped spacer bars (
It has 61 items. From the oil distribution direction, the oil passage (3
It is desirable that the rib direction of the corrugated fins (7) provided in ) coincide with the circumferential direction A in which the Li oil flows, but if this is done, it will be difficult to curve the corrugated fins (7).
Usually, the ribs are completely thickened in the longitudinal direction B as in the air passage (21), and instead, as shown in the figure, a large number of loopers are provided at the rising part of the lip to ensure oil circulation in the circumferential direction A. However, due to this structure of the oil passage (3), there is the following difference.

[Problem that the invention seeks to solve]

First, as mentioned above, in order to ensure oil circulation, a p-bar is provided on the corrugated fin (7), but each time the oil passes through a portion of the corrugated looper, it hits the fin surface and flows in a curved manner. . As a result, the pressure loss in the oil passage (3) becomes large, and in order to improve this, it is necessary to increase the waveform pitch of the fins (7) and extremely reduce the louver pitch, which results in the transmission of This results in a decrease in thermal area and deterioration in fin formability.

Moreover, if the pressure loss in the oil passage (3) is large, the oil must be passed through in one direction. As a result, the cooled oil is returned to the inlet side through a separate pipe provided outside the core of the heat exchanger, making it difficult to downsize the heat exchanger.

Furthermore, in this type of heat exchanger, it is customary to integrate the entire core part by brazing, but if the waveform pitch of the fins (7) in the oil passage (3) is large, the circumferential direction A
In many cases, there are no backup fins to hold the partition plate (1) and spacer bar (5) at both ends until brazing is complete, and even if brazing is performed, brazing failures frequently occur at both ends in the circumferential direction. , there is a high possibility of external leakage or damage to the core.

The purpose of the present invention is to solve all of these problems, to reduce pressure loss, to have a large heat transfer area, and to be able to be miniaturized.
An object of the present invention is to provide a heat exchanger having excellent mechanical strength.

[Means for solving problems]

In order to achieve all of the above objectives, the heat exchanger of the present invention has an improved lip structure so that fluid passes in the direction of the ribs in any fluid passage. In a cross-flow type heat exchanger that is curved and has one fluid communicating in the curved longitudinal direction B perpendicular to the circumferential direction A and the other fluid communicating in the circumferential direction A, a corrugated fin is installed in one fluid passage to extend its lip. provided toward the longitudinal direction B;
In the other fluid passage, the lips are separated at predetermined length intervals leaving the bottom part in the longitudinal direction, and wave-shaped fins are curved toward the bottom side, and the lips are arranged in the circumferential direction A. It is in.

The present invention will be described below based on embodiments shown in the drawings.

FIG. 1 is a perspective view of an example of a heat exchanger embodying the present invention, with the core section partially cut away, and FIG. 2 is a side view of a corrugated fin used in the other fluid passage of the core section. be.

The device shown in FIG. 1 has the same structure as the conventional device shown in FIG. 8, except for the corrugated fins (7) provided in the other fluid passageway (3), so the parts excluding the corrugated fins (7) are the same as the conventional device shown in FIG. 8 are denoted by the same numbers as in FIG. 8, and detailed explanation thereof will be omitted.

According to FIG. 1, the corrugated fin (7) is a so-called serrate-type fin in which lips are formed in a staggered manner in the longitudinal direction L (lip direction) for the purpose of improving heat transfer performance. ) is also cut off every unit length d in the longitudinal direction L (rip direction), leaving the bottom (9).
) side has a curved structure with a curve that matches the curvature of the core part. Then, as shown in FIG. 1, the partition plate (11 (1)
It is located between 1.

In the case of a serrated type fin, the lip (8) should be separated in its longitudinal direction L (
Since the structure is such that they are connected at two locations above and below for each unit length d in the direction of the tape, it is only necessary to disconnect the upper connection location. At that time, if the upper part is connected within the smallest possible range, the disconnection work will be extremely easy. In the case of normal corrugated fins, it is sufficient to leave the bottom part (9) and make a slit in the direction perpendicular to the lip (8).

If the separation interval is increased, the separation process will become easier, but on the other hand, the fins (7) will not follow the curve of the partition plate (1), and the brazing between the two will be incomplete, so there is no risk of this happening. Must be kept within range.

According to the above configuration, the fluid flowing in the circumferential direction A in the other fluid passageway (3) flows in the direction of the ribs of the corrugated fins (7). Therefore, the pressure loss due to the fins (7) is reduced, and the waveform pitch of the fins (7) can be reduced accordingly, increasing the heat transfer area, achieving improved heat exchange efficiency, and increasing the freedom of design. also becomes larger.

Furthermore, when the pressure loss is small, the other fluid passage (3) is
The heat exchanger can be made into a turn structure, eliminating the need for reflux piping, making it possible to downsize the heat exchanger.

Moreover, at the circumferential end of the fluid passageway (3), the corrugated fins (7) are in close contact with the upper and lower partition plates (IHII), and the spacers (5) (5) are located above and below the fins. When attached, the fins (7) create a springback force that brings each member into close contact, improving brazing performance.

As a result, leakage from the same end is prevented, and damage to the heat exchange core can also be prevented.

〔Effect of the invention〕

As is clear from the above description, the present invention is a cross-flow type heat exchanger with nine arcuate curves, and the present invention is a simple method in which both fluids are passed in the direction of the ribs of the corrugated fins. This has great effects in terms of equipment scale and safety.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an example of a heat exchanger embodying the present invention, with the core section partially cut away, Fig. 2 is a side view of corrugated fins used in the core section, and Fig. 3 is a conventional heat exchanger. FIG. 2 is a diagram corresponding to FIG. 1 of the heat exchanger. In the figure, l: partition plate, 2 d one fluid passage (air passage), 3
: The other fluid passage (oil passage), 4: Fluid passage (corrugated fin provided on 2+, 5.6: Spacer bar, 7: Corrugated fin provided on fluid passage (3), 8: Rib, 9:
Bottom of rib (8). 3jl1 Figure 1 Figure 2

Claims (1)

[Claims] (1) In a cross-flow type heat exchanger that is curved in an arc and has one fluid communicating in the circumferential longitudinal direction B perpendicular to the circumferential direction A and the other fluid communicating in the circumferential direction A, one fluid passage The corrugated fins are provided with their ribs facing in the longitudinal direction B, and the ribs are separated at predetermined lengths in the longitudinal direction L, leaving a bottom portion, and curved toward the bottom side in the other fluid passage. , A heat exchanger characterized in that the ribs are arranged facing in the circumferential direction A.