JPS6179993A - Fin tube heat exchanger - Google Patents

Abstract

PURPOSE:To improve close contact between a thin tube and fins in the long axis direction of the tube by the spring effect of corrugated pressed section on the fin by a method wherein corrugate press work is applied on the surface of the fin in the long axis of the non-circular section of the tube. CONSTITUTION:The corrugated pressed section 5 having predetermined widths are provided on the fin 4 at the outside of a non-circular hole in the long axis thereof. A force, pushing a fin collar 6 inwardly (into the direction of the tube), is exerted in the long axis of the non-circular hole by the spring effect of the pressed sections 5. In the fin tube heat exchanger, consisting of a multitude of laminated fins of thin plate of aluminum or the like, and a multitude or non-circular thin tubes of copper or the like inserted into the non-circular holes of the fins in accordance with a predetermined arrangement, the force, pushing the fin collar 6 inwardly into the direction of long axis of the hole, is acting, therefore, deterioration of closely contacting property at the contacting section on the long axis between the fin collar 6 and the thin tube 2 may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fin-tube heat exchanger equipped with a tube having a non-circular cross section such as an ellipse, an ellipse, or an arc.

Structure of the conventional example and its problems As shown in Figure 3, the conventional fin-tube heat exchanger has a group of parallel fins 1 made of thin plates such as aluminum arranged in parallel at regular intervals, and a group of parallel fins 1 made of thin plates of aluminum etc. The heat exchanger tube group 2 is a thin-walled circular tube made of copper or the like inserted into the tube, and air flows between the fins 1 in the direction of the arrow to exchange heat with the fluid inside the tubes.

By the way, in recent years, due to the demand for smaller size and higher performance for heat exchangers, there has been an increase in the use of devices that increase the performance of heat exchangers by narrowing the spacing between fin groups and using more fins in the same volume. However, this has the disadvantage that the pressure loss on the air side increases.One way to solve this problem and also improve the heat transfer performance of the fins is to make the tubes have non-circular cross sections such as ellipses, ellipses, and circular arcs. Shapes may be used.

As an example, FIG. 4 shows an enlarged view of a section around the tube of a heat exchanger using an elliptical tube. In addition, 3 in the figure is a fin collar formed by raising a fin material around the tube insertion hole of the fin in order to obtain close contact with the tube.

When a heat exchanger like the one shown in Figure 4 is used as a condenser for a room air conditioner, the refrigerant pressure in the pipes is normally between 16 and
When the room air conditioner is overloaded, it can rise to about 24 to 2 e Kp, z Fuku G, and in a pipe with a non-circular cross section, this pressure is applied from the inside of the pipe to the outside. The force is in the short axis direction, A-A' in Figure 6.
direction) becomes larger than the long axis direction (B-B' direction in Figure 5), and the tube's cross section tries to become round, resulting in it deforming so that it extends in the short axis direction and contracts in the long axis direction. . As a result, the close contact between the fin collar 3 and the tube 2 is limited to the portion on the short axis (
The area near the 0 part in Fig. 5) becomes better, and conversely, the area on the long axis (the D part in Fig. 6) becomes worse. Therefore, in the D part, the fin 1
There was a problem in that the heat transfer resistance between the pipe 2 and the pipe 2 became large.

Purpose of the Invention The present invention solves the above conventional problems and provides a fin-tube heat exchanger that can maintain good adhesion between the fin collar and the tube even on the long axis of the tube with a non-circular cross section such as an ellipse. It provides:

Structure of the Invention In order to achieve this object, the fin-tube heat exchanger of the present invention includes a fin group consisting of a large number of laminated fins made of thin plates such as aluminum, and a number of ellipsoids and fins arranged in a predetermined arrangement.
A fin-tube heat exchanger is made by inserting a thin-walled tube made of copper or other material with a non-circular cross-section such as an oval or circular arc mortar, and has a structure in which a wavy press is applied to the long axis of the non-circular cross-section of the fin surface. Due to the spring effect of this wavy pressed portion, good adhesion between the longitudinal direction of the thin-walled tube and the fins can be maintained.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIGS. 1 and 2, a wavy pressed portion 5 having a constant width is provided outwardly on the long axis of the non-circular hole of the fin 4. Due to the spring effect of this pressed part 6, a force (indicated by the arrow in FIG. 2) that presses the fin collar 6 inward (in the tube direction) on the long axis is exerted.

In a fin-tube heat exchanger in which a large number of fins having the above structure are stacked, a force that presses the fin collars 6 inward in the long axis direction causes the tube to deform due to the internal pressure, causing the fin collars 6 on the long axis to deform. It is possible to prevent poor adhesion at the portion where the thin-walled tube 2 and the thin-walled tube 2 are in contact with each other.

In addition to the effects of the invention, as is clear from the description of the embodiments, the present invention is a fin-tube heat exchanger that uses tubes with a non-circular cross-sectional shape. By providing a spring effect, it is possible to prevent a decrease in adhesion with the fins due to deformation of the thin-walled tube due to internal pressure.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of the fin collar and surrounding area of a fin according to an embodiment of the present invention, Fig. 2 is a cross-sectional view in the long axis direction of the ellipse of Fig. 4, and Fig. 3 is a perspective view of a conventional fin-tube heat exchanger. 4 is a sectional view of the tube peripheral portion of a conventional fin tube heat exchanger using elliptical tubes, and FIG. 5 is an explanatory diagram of deformation when the elliptical tube of FIG. 4 is subjected to internal pressure. 4... Fin, 5... Wavy pressed part, 6... Thin walled tube with non-circular cross section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A fin group consisting of a large number of laminated thin plate fins made of aluminum, etc., and a large number of thin-walled pipes made of copper etc. with non-circular cross-sectional shapes such as ellipses, ellipses, circular arcs, etc. that penetrate the fin group according to a predetermined arrangement. , a fin-tube heat exchanger in which a wavy press is applied to the outside of the long axis of the non-circular hole on the fin surface into which this thin-walled tube is inserted.