JP2735310B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a pneumatic heat exchanger suitable for an air conditioner and the like, and in particular, regulates a pitch between a plurality of fins. The present invention relates to a heat exchanger having an improved fin collar.

(Prior Art) Conventionally, for example, a serpentine heat exchanger 1 shown in FIG. 6 is a fin tube type air heat exchanger of this type.

In this method, a flat heat transfer tube 2 formed in a flat tube is meandered a plurality of times in order to reduce ventilation resistance, and a pair of upper and lower head pipes 3a and 3b are connected to both ends thereof.

Corrugated fins 4 are respectively attached to the upper and lower ends of the flat heat transfer tube 2 in the figure and the meandering gaps thereof, and a refrigerant or the like is passed through the flat heat transfer tube 2 to receive air blowing in the direction of the arrow in the figure. It exchanges heat with the corrugated fins 4.

The round tube heat exchanger 5 shown in FIGS. 7 (A) and 7 (B) has a plurality of ring-shaped fins 7 mounted on the outer periphery of a circular heat transfer tube 6 at a required pitch in the axial direction. ing.

As shown in FIG. 7 (A), each fin 7 integrally forms a fin collar 7b which rises in the axial direction of the heat transfer tube 6 on the peripheral edge of the opening of the mounting hole 7a through which the heat transfer tube 6 is inserted. The fin curl 7c is formed by bending the free end of the fin collar 7b so as to expand in the outer diameter direction.

Therefore the fin color including this fin curl 7c
The height of 7b (the axial length of the heat transfer tube 64) is the fin pitch FP. That is, the fin pitch FP is appropriately adjusted according to the height of the fin collar 7b of each fin 7 and the bending angle of the fin curl 7c.

By the way, in recent years, in order to reduce the size and improve the performance of the air-type heat exchanger, it has been considered that a heat transfer tube using, for example, an aluminum extruded flat perforated tube can reduce ventilation resistance.

(Problems to be solved by the invention) However, in a heat exchanger incorporating such a flat perforated tube as a heat transfer tube, when the short diameter of the flat perforated tube is made smaller and smaller in order to promote reduction of ventilation resistance. Has a problem that the fin pitch becomes smaller and smaller accordingly.

That is, the mounting hole cut portion for forming the elongated mounting hole of each fin into which the flat perforated tube is to be fitted is cut along the central axis, the section is opened to the left and right, and the fin collar is formed. In this case, the fin colors are substantially equal on the left and right.

Moreover, the short diameter of the cut portion of the mounting hole becomes increasingly narrower as the short diameter of the flat perforated tube to be individually fitted is reduced, so that when the cut portion of the mounting hole is cut along its central axis. The maximum height of the left and right sides of the fin collar is approximately 1/2 of the minor diameter (opening width) of the mounting hole.

Therefore, for example, the short diameter of the flat heat transfer tube is 2-3m
In the case of m, the height of the fin collar is 1 to 1.5 mm at the maximum
Can only be set up to

In other words, the fin pitch can only be 1 to 1.5 mm at the maximum, and there is a problem that the versatility is low such that the degree of freedom of design of the heat exchanger is small and the adjustment of the heat exchange performance is not easy. .

Further, in order to obtain a fin pitch higher than the height of the fin collar, it is necessary to adjust a box jig or the like, thereby increasing the difficulty of the fin mounting operation and increasing the operation cost.

Therefore, the present invention has been made in view of the above circumstances,
An object of the present invention is to provide a heat exchanger capable of appropriately increasing a fin pitch with a simple configuration and improving versatility.

[Configuration of the invention]

(Means for Solving the Problems) The present invention has been made to solve the above problems, and is configured as follows.

That is, in the present invention, the flat heat transfer tube is fitted and fixed in each flat mounting hole of a plurality of fins arranged in parallel in the axial direction, and the pitch of these fins is regulated by the fin collar of each mounting hole. In the heat exchanger described above, the fin collar cuts the mounting hole cut portion of the fin in which the flat mounting hole is to be formed, in a stepwise manner so as to alternately protrude from the central axis to one side and the other side. In addition, these sections are characterized by being opened and opened on both sides.

(Function) Since the cutting line of the mounting hole cut portion that determines the height of the fin collar of each fin protrudes alternately to both sides from the center axis of this cut portion, the height of the fin collar is increased by the amount of the protrusion. Can be higher.

Since the fin collar regulates the fin pitch, the fin pitch can be increased by the height of the fin collar, and the degree of freedom in heat exchanger design can be increased. Adjustment of heat exchange performance can be appropriately performed, and versatility can be improved.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 (A) is a partially cutaway plan view of an embodiment of the present invention. In the drawing, a pneumatic heat exchanger 11 of the present embodiment is arranged between a pair of left and right headers 12a and 12b which are vertically erected. For example, a flat heat transfer tube 13 extruded from aluminum
It communicates between 12a and 12b.

As shown in FIG. 2, the flat heat transfer tube 13 has a plurality of small holes 13a through which a fluid such as a refrigerant passes, which are arranged side by side in the major axis direction, and has a required pitch in the vertical direction of the pair of left and right headers 12a and 12b. Are arranged in parallel.

As shown in FIG. 1 (B), fins 14 made of a vertically long rectangular thin plate are mounted on the outer periphery of the flat heat transfer tubes 13, 13... At a required pitch in the axial direction of each flat heat transfer tube 13. While, for example, a refrigerant is introduced from the pipe 15 and flows out from the outlet pipe 16, heat exchange is performed with the blast indicated by the arrow in FIG. 1 (A).

In FIG. 1 (B), reference numeral 17 denotes a partition plate for guiding the flow direction of a fluid such as a refrigerant.

Each fin 14 has a cladding material coated on the front and back surfaces of the fin main body, and a flat oblong mounting hole 18 into which the flat heat transfer tube 13 is fitted is formed in the longitudinal direction as shown in FIG. A plurality of holes are formed at a pitch, and one end of each mounting hole 18 is opened so that the flat heat transfer tube 13 can be inserted.

Fin collar on the periphery of the inverted U-shaped opening of each mounting hole 18
19 are launched almost all around.

However, the fin curl 20, which is formed so as to protrude outward by a required width in an outward flange shape in an outward flange shape at the rising upper end of the fin collar 19, has a mounting hole center axis O as a center and a left front half in the figure. The fin collar 19 is formed only at the middle 19a of the full height of the fin collar 19 as shown in FIGS. 4 (A) to 4 (C). Not raised and fin curl 2
0 is not formed.

Each fin curl 20 controls the arrangement pitch of the plurality of fins 14 by bringing the outer surface thereof into contact with the back surface of the adjacent fin 14, and each mounting hole 18 is supported by these three fin curls 20. The fin pitch is regulated.

That is, on the left side of the front half of each mounting hole 18 shown in FIG. 3, the fin curl 19 is raised to the full height as shown in FIG.
On the other hand, on the right side in the figure, the fin curl 19 is only raised up to the middle 19a of the entire height.

Also, as shown in FIG. 4 (B), the fin collar 19 is raised only up to the middle 19a of the entire height at the rear half of the mounting hole 18 on the left side, while the fin collar 19 is raised to the full height at the right side. The fin curl 20 is formed on the fin.

Further, as shown in FIG. 4 (C), the collars 19 and the fin curls 20 are formed upright over substantially the entire circumference at the arc-shaped rearmost portion of the mounting hole 18.

Such fin collars 19 and curls 20 are formed as follows.

First, as shown in FIG. 5 (A), in each fin main body 14a, each mounting hole cut portion 18a in which the mounting hole 18 is to be formed is cut along a stepped cutting line 21 shown by a two-dot chain line in the figure. While cutting, the arc-shaped fin curl of each mounting hole 18
Form 20.

Each cutting line 21 projects slightly to the left in the drawing from the center axis O at the rear of the mounting hole 18 with respect to the center axis O of each mounting hole cut portion 18a, while the cutting line 21 moves to the right in the drawing at the front. The required width protrudes.

Accordingly, a pair of left and right pieces cut by the cutting line 21 are respectively opened to the left and right according to the inverted U-shaped opening base line of each mounting hole 18 and rise up in a substantially vertical direction, and the fin curl 19 is formed first.

As a result, the height of the left fin curl 19 in the front half of the mounting hole cut portion 18a in the drawing is formed higher than the center axis O by the amount of protruding to the right in the drawing.

Also, in the rear half of the mounting hole cut portion 18a, the height of the right fin collar 19 is higher than that of the center axis O by the amount protruding leftward. For example, when the short diameter (opening width) of the mounting hole cut portion 18a is 3 mm, the maximum height of the fin curl 19 is approximately 1.5 mm (3/2 mm) for each of the left and right when cut along the central axis O. In the fin curl 19 of the embodiment, it can be set to 1.5 mm or more.

Each of the upper ends of the left and right fin collars 19 raised higher than when cutting along the central axis O as shown in FIG.
Are respectively curvedly formed.

That is, in the present embodiment, the height to the fin curl 20 that regulates the fin pitch can be appropriately set higher than the center axis O, so that the fin pitch can be increased.

A fifth part is located between the mounting hole cut portions 18a.
As shown in the sectional side view of FIG.
A plurality of ventilation slits 22 are formed along the major axis direction of the fin body 14a, and these ventilation slits 22 are formed in the thickness direction of the fin body 14a.
It is designed to open and ventilate.

The ventilation slits 22 alternately protrude in the front and back directions in FIG. 5A, respectively, and open the upper and lower ends in the drawing.

Therefore, according to the present embodiment, the rising height of the fin collar 19 that regulates the fin pitch can be set higher than the height of the central axis O of the mounting hole cut portion 18a.
By appropriately adjusting the fin pitch, it is possible to design a heat exchanger having various heat exchange capacities, thereby increasing the degree of freedom of design and improving versatility.

〔The invention's effect〕

As described above, the present invention cuts a mounting hole cut portion for forming a mounting hole of a fin into which a flat heat transfer tube is to be inserted, in a stepwise manner so as to alternately protrude from a central axis to one side and the other side. By doing so, the fin collar is formed, so that the height of the fin collar can be set to be higher than substantially half of the length of the mounting hole cut portion in the width direction, and the fin pitch can be appropriately adjusted.

Therefore, it is possible to appropriately design a heat exchanger in which the cooling capacity of the fin is appropriately adjusted, so that its versatility can be improved.

[Brief description of the drawings]

1 (A) is a partially cutaway plan view of an embodiment of the heat exchanger according to the present invention, FIG. 1 (B) is a partially cutaway side sectional view of FIG. 1 (A), and FIG. FIGS. 1 (A) and 1 (B) are partially cutaway perspective views of a flat heat transfer tube, FIG. 3 is a partially cutaway plan view of fins shown in FIGS. 1 (A) and (B), and FIG. 4 ( A) to (D) are cross-sectional views taken along line AA in FIG. 3, cross-sectional views taken along line BB in FIG. 3, cross-sectional views taken along line CC in FIG. FIG. 5 (A) is a partially enlarged view before drilling the fin mounting holes shown in FIG. 3, and FIG. 5 (B) is a VB-
FIG. 6 is a perspective view of a conventional serpentine heat exchanger, FIG. 7 (A) is a partially enlarged longitudinal sectional view of a round tube heat exchanger, and FIG. 7 (B) is a sectional view of the same. It is a BB sectional drawing of the figure (A). 11 ... heat exchanger, 12a, 12b ... left, right head pipe, 13
... Flat heat transfer tube, 14 ... Fin, 14a ... Fin body, 1
8 mounting holes, 19 fin collars, 20 fin curls, 21 cutting lines, 22 ventilation slits.

Claims (1)

(57) [Claims] A flat heat transfer tube is fitted and fixed in each of flat mounting holes of a plurality of fins arranged in parallel in the axial direction, and the pitch of these fins is regulated by a fin collar of each of the mounting holes. In the heat exchanger described above, the fin collar cuts the mounting hole cut portion of the fin in which the flat mounting hole is to be formed, in a stepwise manner so as to alternately protrude from the central axis to one side and the other side. A heat exchanger characterized in that these sections are opened and opened on both sides.