JPS61105099A - Fin tube heat exchanger - Google Patents

Abstract

PURPOSE:To improve the adhesion force with a pipe throughout the whole periphery of a fin color by a method wherein a corrugated press working is made nearby the periphery part of a heat conduction pipe inserting hole for increasing a spring effect. CONSTITUTION:A fin color 5 is formed on the periphery of the heat conductive pipe inserting hole of a fin 4. A corrugation, the first press working part 6 is provided at the outer periphery of the fin color 5. A corrugation, the second press working part 7 having continuous plural waves having preset width is provided on the longitudinal axis of the heat conduction pipe inserting hole. Due to the spring effect of the first press working part 6, the fin color 5 is pressed toward inner side (a heat conduction pipe 8 direction) by the pressing force throughout the whole periphery of the fin color 5. On the longitudinal axis of the section of the heat conduction pipe 8, the stronger pressing force for the fin color 5 is acted toward inner side in the longitudinal direction, therefore, even when the heat conductive pipe 8 is deformed to be round by the inner pressure of the heat conductive pipe 8, the deterioration of adhesion is restrained at the contact part between the fin color 5 on the longitudinal axis and the heat conduction pipe 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fin-tube heat exchanger comprising a heat transfer tube having a non-circular cross section such as an ellipse, an ellipse, or an arc, and fins closely attached to the heat transfer tube.

Structure of the conventional example and its problems As shown in Fig. 4, the conventional fin-tube heat exchanger has a group of parallel fins 1 made of thin plates of aluminum or the like with good heat transfer coefficient arranged in parallel at regular intervals.

It consists of a heat exchanger tube group 2 made of thin-walled circular tubes made of copper or the like that penetrates the fin group 1 at right angles, and air flows between the fin groups 1 in the direction of the arrow to exchange heat with the fluid inside the tubes. It has become.

By the way, in recent years, there has been a demand for smaller size and higher performance for heat exchangers, so there is a need to reduce the spacing between the fins in the fin group so that more fins can be used in the same volume, thereby improving heat exchanger performance. It has become widely used. However, as the fin width is reduced, the pressure loss on the air side increases.
Non-circular cross-sectional shapes such as ellipses and circular arcs may be used.

As an example, FIG. 6 shows a cross-sectional view of the peripheral portion of the heat transfer tube of a fin-tube heat exchanger using an elliptical tube. In order to improve the adhesion with the insertion hole, the fin collar 3 is formed by raising the fin material.

When such a fin-tube heat exchanger is used as a condenser for a room air conditioner, the refrigerant pressure in the heat transfer tubes is normally around 16 to 20 4-G, and when the room air conditioner is overloaded, the refrigerant pressure is 24 to 26 Fj/ In a heat transfer tube with a non-circular cross section, this pressure is applied from the inside of the tube to the outside, and the cross section of the transfer tube tends to become round. Therefore, the force is in the short axis direction (A-A' in Figure 6).
The direction of the transmission tube is larger than the direction of the long sleeve (B-B/direction in FIG. 6), and as a result, the transmission tube extends in the direction of the short axis.
Deforms to shrink in the long axis direction. As a result, the close contact between the fin collar 3 and the transmission tube 2 is good near the part on the short axis (section 0 in Fig. 6), but on the other hand, the part on the long axis (section 6) is good.
The situation worsens near part D in the figure. Therefore, in the portion D of FIG. 6, the heat transfer resistance between the fins 1 and the transfer tube 2 is so strong that efficient heat transfer between the fins 1 and the transfer tube 2 cannot be performed.

Purpose of the Invention Therefore, the present invention solves the above-mentioned conventional problems, and can maintain good adhesion between the fin collar and the tube on the long axis of the transmission tube having a non-circular cross section such as an ellipse. It is an object of the present invention to provide a fin-tube heat exchanger that can improve adhesion to tubes over the circumference.

Structure of the Invention In order to achieve this object, the fin-tube heat exchanger of the present invention includes a fin group formed by laminating a large number of thin plate fins made of aluminum or the like with good heat conductivity, and a fin tube inserted into the fin group in a predetermined arrangement. It is formed by standing up a fin material around a heat exchanger tube made of copper or other material with a non-circular cross-sectional shape such as an ellipse, an ellipse, or an arc, and a heat exchanger tube insertion hole for inserting the heat exchanger tube into the fin. A part of the fin located on the outer periphery of the fin collar is pressed into a wavy shape, and a plurality of ridges are pressed outwardly on the long axis of the cross section of the heat exchanger tube. It is structured as follows.

According to the above configuration, the spring effect of the wavy press portion presses the fin collar against the heat transfer tube over the entire circumference of the fin collar, maintaining good adhesion between the fin collar and the transfer tube, and furthermore, the plurality of peaks are formed on the long axis. The stronger spring effect produced by the series of corrugated presses improves the close contact between the fin collar and the transmission tube in this area.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The feature of this embodiment lies in the periphery of the fin collar, and other parts are similar to conventional fin tube heat exchangers. Therefore, the explanation will be omitted. FIG. 1 is a cross-sectional view of the vicinity of the fin collar of the fin in an embodiment of the present invention, and the outer periphery of the fin collar 6 formed around the heat exchanger tube insertion hole of the fin 4 has a wavy first press-formed part 6. A wavy second press-formed portion 7 having a plurality of peaks with a constant width is provided on the long axis of the heat exchanger tube insertion hole.
This is provided. FIG. 2 is a cross-sectional view of the fin 4 on the short axis of FIG. A pressing force (arrow in Figure 2) acts in the direction of Figure 3 is 7th
This is a cross-sectional view of the fin 4 along the long axis of the figure, and due to the spring effect of the wavy second press-formed part 7 which is arranged in a plurality of ridges with a constant width inside the wavy first press-formed part 6,
The force (arrow in FIG. 6) that presses the fin collar 6 toward the inside on the long axis (in the direction of the heat exchanger tube 8) acts more strongly.

In the fin-tube heat exchanger manufactured in the same manner as before by stacking a large number of fins 4 having the above structure, the fin collar 5 is pressed against the heat transfer tube 8 as shown by the arrow in FIG. The contact thermal resistance with the heat exchanger tube 8 can be reduced over the entire circumference of -5. Furthermore, on the long axis of the cross section of the heat exchanger tube 8, as shown by the arrow in FIG.
The fin force, the force that presses 7-5 inward in the long axis direction, acts more strongly, so the internal pressure of the heat exchanger tube 8 causes the heat exchanger tube 8 to
Even if it becomes round or deforms, it is possible to suppress deterioration of adhesion at the portion where the fin collar 5 and the heat exchanger tube 8 are in contact with each other on the long axis.

Effects of the Invention As is clear from the description of the embodiments, the present invention applies wavy pressing around the heat exchanger tube insertion holes provided in the fins of a fin-tube heat exchanger using heat exchanger tubes with a non-circular cross section to create a spring effect. The fin collar can be pressed toward the heat exchanger tube by having the fin collar, and the contact thermal resistance between the fin collar and the heat exchanger tube can be reduced. In addition, on the long axis of the cross section of the heat exchanger tube, the force that presses the fin collar toward the long axis of the heat exchanger tube can be made stronger by press forming a series of multiple peaks, and the deformation of the heat exchanger tube due to the internal pressure of the heat exchanger tube This has the effect of suppressing deterioration of the adhesion between the fin collar and the heat transfer tube.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the fin casing of a fin according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the fin collar along the short axis of the ellipse in Fig. 1, and Fig. 3 is a cross-sectional view of the fin collar along the long axis of the ellipse. , Fig. 4 is a perspective view of a conventional fin tube heat exchanger, Fig. 5 is a partial cross-sectional view of the periphery of the heat exchanger tube, and Fig. 6
The figure is an explanatory diagram of a malfunction caused by deformation when the elliptical tube of FIG. 5 is subjected to internal pressure. 4...Fin, 5...Fin color,
6... Wavy first press loe part, 7...
Wave-shaped second press processing part, 8... Heat exchanger tube. Name of agent: Patent attorney Toshio Nakao and 1 other person

Claims (1)

[Claims] A group of fins made by laminating a large number of thin plate fins made of aluminum or other materials with good heat conductivity, and copper, etc. with a non-circular cross-sectional shape such as an ellipse, an ellipse, or a circular arc inserted through the fin group in a predetermined arrangement. The heat exchanger tube is equipped with a fin collar formed by raising the fin material around the heat exchanger tube insertion hole for inserting the heat exchanger tube into the fin, and a wavy press process is applied to the outer periphery of the fin collar. A fin tube heat exchanger in which a plurality of ridges are pressed outwardly on the long axis of the cross section of the heat transfer tube.