JPS5932791A - Corrugated type heat exchanger - Google Patents

Abstract

PURPOSE:To obtain the corrugated type heat exchanger with excellent heat- exchange performance by a method wherein corrugation forming grooves with the same pitch as that of corrugated fins are provided on the surface of flat tubes so as to realize uniform pitch intervals of the corrugated fins after being assembled and at the same time to keep the straight line portions of the corrugated fins precisely at right angle to the flat tubes. CONSTITUTION:The respective pitches of the corrugated fins 4 and 5 are surely kept at constant and at the same time the straight line portions of the corrugated fins 4 and 5 are allowed to take the direction at right angle to the flat tubes 3B-3D by matingly joining the trough and crest parts of the corrugation formed on the flat tubes 3B-3D with the crest and trough parts of the corrugated fins 4 and 5. In addition, the genration of turbulent flow in the coolant flowing within the flat tubes due to the corrugation brings the effect to improve the heat- exchange efficiency of the heat exchanger. Furthermore, because of the pitches of the corrugated fins 4 and 5 being kept at constant, the resistance of the air flow passing through corrugated fin portions is reduced and consequently the effect to contrive to save energy as a whole is developed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger, and particularly to a flat tube shape suitable for a corrugated heat exchanger.

FIGS. 1 and 2 show an example of a conventional corrugated heat exchanger. Flat tube bent into a wave shape 1
A large number of wavy corrugated fins 2 are arranged between the two. The flat tube 1 and the corrugated fins 2 are joined by welding.

Recently, there has been a call for resource and energy conservation in various fields, and even in the above-mentioned corrugated heat exchanger, increasing the efficiency of heat exchange performance and making it more compact have become major issues. Particularly, in improving the heat exchange efficiency, the pitch of the corrugated fins 2 is an essential element.

FIGS. 3(A) to 3(C) show corrugated fins 2 arranged between flat tubes 1 in a conventional corrugated heat exchanger.
This shows the arrangement of the .

As shown in Fig. 3 (A), although the corrugated fins 2 should originally be arranged so that the straight portions are perpendicular to the flat tube 1, they are arranged in a ridge as shown in Fig. 2 (J3). Such as the corrugated fin 2 whose rounded portions and troughs are smooth, and the small corrugated fin 2 whose crests and troughs are curved as shown in Fig. 3 (C).
In most cases, the seven straight sections were not located at right angles to the flat tube 1, but were arranged in a crooked manner. This is because when assembling the heat exchanger, tightening from both sides causes unbalanced forces, and the corrugated fins 2 are placed in an inclined position due to many factors such as poor shape and rigidity. It is being When the corrugated fins 2 are disposed on the flat tube 1 at an angle as described above, the interval between the flat tubes 10 changes and the joint area between the flat tube 1 and the corrugated fins 2 becomes uneven, especially as shown in FIG. 3(C). In such a case, the bonding area of the corrugated fins 2 is significantly reduced, resulting in a reduction in heat exchange performance. Furthermore, the spacing between the louvers arranged corresponding to the corrugated fins 2 becomes uneven, and the resistance of passing through the corrugated fins 2 becomes large, which also reduces the heat exchange performance.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a corrugated heat exchanger with excellent heat exchange performance.

The present invention provides corrugated grooves on the surface of the flat tubes of a corrugated heat exchanger with the same pitch as the corrugated fins.
The unevenness of the flat tube on the peak side and the valley side of the fins is made to be alternately A", so that the pitch interval of the corrugated fins is made uniform after assembly, and the unevenness of the flat tube is By accurately arranging the convex to the concave and the concave to the convex V, +M' to the flat tube,
By keeping the straight portions of the corrugated twin accurately at right angles, the purpose stated in - is achieved.

An embodiment of the present invention will be described below with reference to the drawing V3i1-iJJ.
do.

FIGS. 4(A) to 4(C) are explanatory diagrams showing essential parts of an embodiment of the corrugated heat exchanger of the present invention. The opposing flat tubes 3A, 31) are made with their concave and convex portions facing each other. It is arranged by joining the four parts and the convex part of pipe 3 J3 and flat pipe 3C together. FIG. 3(C) shows an example in which the irregularities formed on the flat tubes 3C and 3B are angular in shape. In this example, the crests and troughs of the corrugated fin 5, whose bent portions are bent at right angles, are arranged by aligning and joining the convex portions 7S15 of the flat tubes 3C and 3D.

In this way, in this embodiment, the peaks and valleys of the corrugated fins 4 are joined to the uneven parts of the flat tubes 3B and 3C, and the peaks and valleys of the corrugated fin 5 are joined to the uneven parts of the flat pipes 3C and 3D. By joining the corrugated fins 4 and 5, the pinch of the corrugated fins 4 and 5 can be maintained constant, and the straight parts of the corrugated fins 4 and 5 can be flattened.
It is possible to accurately maintain the -Cik angle direction with respect to B to 3D. In particular, in the example shown in FIG. 4(C), the flat tubes 3C, 3
The surface irregularities described in 1) increase the contact area of the corrugated fin with the flat tube and serve as a reservoir for welding flux, resulting in better joining welding conditions.

FIG. 6 shows an example of a method for forming irregularities on the flat tube 3B as shown in FIGS. 4(A) and (13).

This is achieved by feeding the flat tube 3B into the narrow gap between the rolls 6A and 6J3, which have unevenness with the same pitch as the pitch of the corrugated fins 4, and by applying a rolling transfer force of 11 times, the flat tube 3B having a uniform unevenness is created. can be manufactured at high speed.

FIG. 6 shows a method of forming irregularities as shown in FIG. 4(C) on a flat tube. By sandwiching and compressing the flat tube 3D between metal plates 7A and 7B having the same unevenness pitch as the pitch of the corrugated fins 5, the flat tube 3D
forming angular irregularities on the surface. This method is characterized in that it can be rolled accurately, especially when forming an uneven shape with each corner having a small radius.

FIGS. 7(A) and (B) show a flat tube 3B with unevenness.
The state of the heat exchange refrigerant flowing in 3D is multiplied by 4. Flat tube 3B with such unevenness.

According to 3D, turbulent flow occurs in a part of the refrigerant flowing around the inner surface of the flat tube, and the heat exchange performance can be improved.

Note that the heat exchange performance due to this turbulent flow is several times that of the case where the pitch of the corrugated fins is completely narrowed.

According to this embodiment, by forming uneven metal on the flat tubes 3A to 31 and joining the peaks and troughs of the corrugated fins 4 and 5 to the uneven parts, each pitch of the corrugated fins 4 and 5 is completely fixed. This has the effect of being able to be held constant and reliably, and the straight portions of the corrugated fins 4 and 5 are perpendicular to the flat tubes 3B to 3DK. It has the effect of making it look rough and flat! By creating turbulence in the refrigerant flowing inside, the heat exchange efficiency can be significantly improved. As mentioned above, the pitch of corrugated fins 4 and 5 is constant,
Since the spacing between the louvers arranged corresponding to the corrugated fins 4 and 5 is also uniform, the resistance of the air flow passing through the corrugated fins can be reduced and the air blowing efficiency can be improved, so that the overall heat exchange is improved. This has the effect of saving energy in the device.

As described above, according to the present invention, a corrugated heat exchanger with excellent heat exchange performance can be provided.

[Brief explanation of drawings]

Claims (1)

[Claims] 1. The flat tubes that flow the refrigerant are bent so that the straight parts are arranged in parallel, and the straight parts of these flat tubes are
The corrugated fins are combined and arranged so that the straight part of the corrugated fin is perpendicular to the straight part of the flat tube,
In a corrugated heat exchanger that performs heat exchange by blowing cooled air between corrugated fins, the straight portions of the flat tubes facing each other are formed with unevenness having the same pitch as the corrugated fin pitch, and the corrugated portions are formed in the concave and convex portions. A corrugated heat exchanger characterized by combining flat tubes and corrugated fins by merging the peaks and valleys of the fins.