JPH06257976A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide a heat exchanger without leaking heat exchanging air to the outside of the heat exchanger, in the heat exchanger constituted of corrugate fins connected between the straight tubes of meandering serpentine tube. CONSTITUTION:Air leakage preventing plates 13 are arranged between corrugate fins 3, corrugated so as to have wavy form, and the straight tube parts 1a of a meandering serpentine tube 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger suitable for an automobile evaporator, a refrigerator evaporator, a condenser or the like.

[0002]

2. Description of the Related Art Generally, as an evaporator or a condenser used in a commercial refrigeration showcase, a single aluminum tube is meandered to form a serpentine tube having a plurality of rows of serpentine tubes. It is known that corrugated fins bent in a corrugated shape are joined between straight pipe portions.

[0003] This kind of product is simply manufactured by making one tube meandering and joining corrugated fins between the straight pipe parts of the tube, so that it can be easily manufactured and the core can be manufactured according to the required heat exchange performance. Since the height, width, etc. can be changed appropriately, there is an advantage that the design is very easy.

[0004]

However, in the conventional structure, since the above-mentioned straight pipe portion is bridged so as to be spaced in the width direction of the corrugated fin, it is provided between the corrugated fin and the straight pipe portion. Has a gap, and air for heat exchange leaks from the gap, so that there is a problem that the heat exchange performance is deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a heat exchanger that does not cause air leakage.

[0006]

In order to achieve the above object, the present invention provides a corrugated fin in which a corrugated fin bent in a corrugated shape is joined between straight pipe portions of a serpentine tube bent in a meandering shape. It is characterized in that an air leakage prevention plate is provided to prevent air leakage from between the straight pipe portion and the straight pipe portion.

[0007]

When the corrugated bent corrugated fins are joined between the straight pipe parts of the serpentine tube bent in a meandering shape, a part of the air flowing into the concave part of the corrugated fins causes a gap between the straight pipe parts of the tubes. Through and escape upwards,
Further, a part of the air flowing into the convex portion of the corrugated fin may escape downward through the space between the straight pipe portions of the tube.
The escaped air comes into contact with the upper tube or the lower tube and exchanges heat between them. However, the air that escapes through the tubes in the uppermost stage or the lowermost stage does not exchange heat as it is, but escapes to the outside of the heat exchanger, and the heat exchange performance deteriorates accordingly. Therefore, according to this embodiment, at least the uppermost or lowermost corrugated fins and the straight pipe portions are provided so that air does not leak out of the heat exchanger through the uppermost or lowermost tubes. Since the air leakage prevention plate is provided between the heat exchangers, the air does not escape to the outside of the heat exchanger, and the heat exchange performance does not deteriorate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show an evaporator for a refrigerator. This evaporator 100 includes a serpentine tube 1 bent in a meandering shape and a corrugated fin 3 joined between straight pipe portions 1a of the serpentine tube 1. The corrugated fins 3 are provided with reinforcing side plates 5 joined to both ends. At this time, the air flow is made to flow as shown in FIG. All of these parts 1, 3 and 5 are made of pure aluminum or an aluminum alloy (hereinafter, simply referred to as aluminum in this specification), and they are assembled and then joined by a brazing method.

In manufacturing the serpentine tube 1, first, as shown in FIG. 2, a tube 1 having a circular cross section is bent into a serpentine shape at a pitch P and a radius R over a predetermined number of times, and then, Tube 1 bent in a meandering shape
2 is bent so as to be folded in the direction orthogonal to the paper surface at point a in FIG. 2, and this is repeated at some predetermined places to form a serpentine tube 1 having a serpentine shape extending over a plurality of rows. However, the bending method of folding so as not to be folded is not limited to this, and the length L may be lengthened in advance and the tube 1 may be bent at a right angle to the paper surface in the middle of the straight portion.

Finally, the dimension between the straight portions of the tube 1 and the total height dimension after being bent in a meandering shape are adjusted to predetermined dimensions by pressing with a press or the like. According to this, it is possible to easily manufacture products having different core widths, heights, and the like simply by appropriately changing the number of meanders.

Further, at this stage, at the same time as the pressing, as shown in FIG.
As shown in FIG. 5, flattening is performed on the tube 1 having a circular cross section, and flattening is performed to form flat portions 11 and 11 at both ends. The tube 1 may be an inner grooved tube or an inner smooth tube.

Next, as shown in FIG. 3, a corrugated fin 3 made of a brazing sheet is interposed between the straight pipe portions 1a of the serpentine tube 1. The corrugated fin 3 is formed by bending an aluminum plate having a width across the straight pipe portions 1a in four rows into a corrugated shape. After the corrugated fin 3 is interposed, the serpentine tube 1 is inserted.
And the corrugated fin 3 are brazed together. At this time, since the tube 1 is provided with the flat portion 11 as described above, the joint area with the corrugated fins 3 is increased, so that the joint strength is increased.

Air for heat exchange is flowed through the heat exchanger 100 manufactured in this manner as shown in FIG. 3 during use.

By the way, referring to FIG. 5, the air flowing into the concave portion 3a of the corrugated fin 3 passes between the straight pipe portions 1a of the tube 1 as shown by a solid arrow in FIG. Escape to. In addition, the convex portion 3 of the corrugated fin 3
The air flowing into b passes partially between the straight pipe portions 1a of the tube 1 and escapes downward in the figure, as shown by a dotted arrow.

The escaped air comes into contact with the upper tube 1 or the lower tube 1 as shown in FIG. 3, and heat is exchanged between them. However, the air that escapes through the tubes 1 at the uppermost stage or the lowermost stage does not undergo heat exchange as it is, but escapes to the outside of the heat exchanger 100, and the heat exchange performance deteriorates accordingly.

According to this embodiment, however,
Alternatively, the heat exchanger 100 is passed through between the tubes 1 at the bottom.
As shown in FIG. 3, an air leakage prevention plate 13 is disposed between the uppermost or lowermost corrugated fin 3 and the straight pipe portion 1a so that air does not leak to the outside.

As shown in FIG. 6, the air leakage prevention plate 13 has a recess 13a for holding the tube 1, and the recess 13a is formed by press-molding the air leakage prevention plate 13.

According to this, as is clear from FIG. 3, the straight pipe portion 1a of the tube 1 is passed through, and the lowermost portion in the drawing,
Alternatively, since the air does not escape to the uppermost side, that is, outside the heat exchanger 100, the heat exchange performance does not deteriorate. The air leakage prevention plate 13 may be provided so as to surround the outside of the heat exchanger 100, not between the fins 3 and the straight pipe portion 1a.

The above is an example in which the air leakage prevention plates 13 are provided only at the uppermost stage and the lowermost stage of the heat exchanger 100. However, as shown in FIG. 7, they are provided at each stage. Good.

When the air leakage prevention plate 13 is significantly provided, as shown in FIG. 8, both longitudinal ends of each plate 13 (only one side is shown) may be slightly bent toward the corrugated fin 3 side. If the corrugated fins 3 are bent in this manner, the corrugated fins 3 can be sandwiched between the bent end portions 13b, so that the corrugated fins 3 can be accurately positioned during manufacturing, and the quality of the heat exchanger 100 is improved. be able to.

FIG. 9 shows another embodiment.

9A and 9B, the feature of this embodiment is that a plurality of elongated holes 21 as described below are formed in the side plates 5 at both ends of the heat exchanger, and the serpentine tube 1 is formed in the elongated holes 21. Is to be inserted.

That is, as shown in FIG. 10, cut and raised portions 21a having a spring property are integrally formed on both edges of the elongated hole 21, and the bent portion of the tube 1 is inserted into the elongated hole 21. Occasionally, as shown in FIG. 11, after the cut-and-raised portion 21a is once deformed to the outside and the tube 1 is fitted, the cut-and-raised portion 21a returns to the inside and closely contacts the outer circumference of the tube 1. It has become. The opening width d at the tip of the cut and raised portion 21a is preferably narrower than the width D of the tube 1 by a predetermined width α.

According to this, when the tube 1 and the side plate 5 are joined by the brazing method or the like, both are firmly adhered, so that the joining operation can be easily performed.

In addition to what has been described above, according to these embodiments, one tube 1 is made to meander and the corrugated fins 3 are joined between the straight pipe portions 1a, so that it is easy to manufacture and necessary. Since the height and width of the core can be changed as appropriate according to the heat exchange performance,
The effect is that it is very easy to design.

Further, since the refrigerant flows in the tube 1 bent in a meandering shape, the refrigerant flows smoothly no matter how the heat exchanger is arranged. Therefore, the mounting direction of the heat exchanger is limited. Further, since the corrugated fin 3 is used, the heat exchanger performance can be improved by providing a cutout hole, a louver, or the like at a predetermined position of the corrugated fin 3. Is obtained.

[0028]

As is apparent from the above description, according to the present invention, since the air leakage prevention plate is provided, the air does not escape to the outside of the heat exchanger and the heat exchange performance is deteriorated. There is no such thing.

[Brief description of drawings]

FIG. 1 is a front view showing an evaporator for a refrigerator.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view of a tube.

FIG. 5 is a perspective view showing the flow of air through a heat exchanger.

FIG. 6 is a perspective view showing an air leakage prevention plate.

FIG. 7 is a view corresponding to FIG. 3 showing another embodiment.

FIG. 8 is a view corresponding to FIG. 6 showing another embodiment.

9A and 9B are views showing another different embodiment, and are a side view and a front view of a side plate, respectively.

10 is a diagram showing a state before inserting a tube into the side plate of FIG. 9. FIG.

11 is a diagram showing a state after inserting a tube into the side plate of FIG. 9. FIG.

[Explanation of symbols]

 1 Serpentine Tube 1a Straight Pipe Part 3 Corrugated Fin 5 Side Plate 13 Air Leak Prevention Plate 100 Heat Exchanger

Claims (1)

[Claims] 1. A serpentine tube having a serpentine tube and a corrugated fin that is bent in a corrugated shape is joined between the straight tube portions of the serpentine tube, and an air leak is prevented between the corrugated fin and the straight tube portion. A heat exchanger having an air leakage prevention plate.