JPH1078296A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a prescribed pitch between plate-shaped fins and to improve a property of close contact of the plate-shaped fins with a flat-shaped heat exchange tube and thermal conductivity. SOLUTION: In a heat exchanger equipped with a plurality of plate-shaped fins 1 arranged at appropriate pitches and a flat-shaped heat exchange tube 3 piercing insertion holes 2 provided in these plate-shaped fins 1, the relation between the thickness (H) of the flat-shaped heat exchange tube 3 and the pitch (P) of the plate-shaped fins 1 is set to be P<H<2×P, while the length of one of standing pieces 12 and 13 cut to stand from the opposite long sides of the opening edge of the insertion hole 2 is made equal to or larger than the pitch (P) of the plate-shaped fins 1 at least and the standing pieces 12 and 13 are brought into uniform contact with the flat-shaped heat exchange tube 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly, to a heat exchanger used in, for example, an air conditioner for a vehicle or an air conditioner for a house, which is arranged at an appropriate pitch. The present invention relates to a heat exchanger in which a plurality of plate-like fins and heat exchange tubes are in contact with each other.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger of this type, as shown in FIGS. 8 and 9, a plurality of plate-like fins a arranged in parallel at regular intervals, and these plate-like fins a are punched. There is known a heat exchanger having a heat exchange tube c having a substantially flat elliptical cross section penetrating a provided elongated insertion hole b. The use of the flat heat exchange tubes c has an advantage that the loss of air resistance can be reduced as compared with the circular heat exchange tubes.

In a heat exchanger using such a flat heat exchange tube c, the pitch P of the plate fins a is determined, the adhesion between the plate fins a and the flat heat exchange tubes c is improved, and heat conduction is performed. Piece d on the long side of the opening edge of the insertion hole b to improve the efficiency.
Is provided.

In this type of heat exchanger with plate fins, if the flat heat exchange tube c is thick, the resistance on the air side increases and the heat conductivity decreases. Thinner is preferred. Further, in order to improve the heat exchange efficiency, it is necessary to arrange the plate-like fins a at a predetermined pitch.

[0005]

However, in this type of conventional heat exchanger, as shown in FIG. 10, the upright piece d is half the width of the insertion hole b, that is, half the thickness of the flat heat exchange tube c. When the fin pitch is equal to or greater than the thickness of the flat heat exchange tube c, the function of positioning the standing piece d cannot be exhibited.

As a means for solving this problem, FIG.
As shown in FIGS. 11A and 11B, a wavy cut e is provided across the center line C of the insertion hole b to form a standing piece f, or as shown in FIGS. 11C and 11D. So that the insertion hole b
By forming a substantially hat-shaped cut g straddling the center line C to form the standing pieces h and i, a fin pitch can be obtained. However, as shown in FIG.
In i, since the contact with the flat heat exchange tube c is partial, the problem is that the adhesion between the plate-like fin a and the flat heat exchange tube c is reduced and the thermal conductivity is impaired. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a heat exchanger capable of securing the pitch of plate-like fins and improving the adhesion between the heat exchange tubes and the plate-like fins and the heat exchange efficiency. It is intended to provide.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a plurality of plate-like fins arranged at an appropriate pitch and an insertion hole provided in these plate-like fins are provided. And a flat heat exchange tube penetrating the flat heat exchange tube, wherein the relationship between the thickness (H) of the flat heat exchange tube and the pitch (P) of the plate-like fins is P <H <. 2 × P
The length (L) of one of the upright pieces cut and raised from the long side opposite to the opening edge of the insertion hole is at least equal to or greater than the pitch (P) of the plate-like fins. To make it contact the heat exchange tube evenly,
It is characterized by the following.

In the present invention, it is preferable that the angle at which the upright piece is cut and raised is less than 90 degrees (claim 2).

According to the heat exchanger of the present invention configured as described above, the pitch of the plate-like fins can be ensured by the upright pieces, and the upright pieces can be evenly brought into line contact with the flat heat exchange tube. Surface contact can be made (claim 1). In this case, when the cut-and-raised angle of the upright piece is less than 90 degrees, the upright piece can be more reliably brought into contact with the flat heat exchange tube. Therefore,
The plate-shaped fins can be arranged at a predetermined pitch, and the adhesion between the plate-shaped fins and the flat heat exchange tube and the heat exchange efficiency can be improved.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an example of a heat exchanger according to the present invention, FIG. 2 is a sectional perspective view showing a main part thereof, FIG. 3 is a sectional view (a) showing a main part and an enlarged sectional view of a part A. (B).

The heat exchanger comprises a plurality of plate-like fins 1 arranged at a predetermined pitch P;
A plurality of flat heat exchange tubes 3 that are parallel to each other and penetrate through the substantially flat elliptical insertion hole 2 provided in the base plate, and a pair of pipes that are arranged at an interval from each other and communicate with the flat heat exchange tubes 3 The headers 4 and 5 are integrally brazed.
In this case, the flat heat exchange tube 3 has a plurality of passages 7 defined by a plurality of reinforcing walls 6. One header 4 is provided with an inlet 8 for the heat medium R, and the other header 5 is provided with an outlet 9.

In the heat exchanger constructed as described above, the headers 4 and 5 and the flat heat exchange tubes 3 are formed of extruded aluminum alloy material, and the plate-like fins 1 are formed of aluminum alloy plate material. Have been.

The plate-like fin 1 is provided with an insertion hole 2 for a flat heat exchange tube 3. The flat elliptical insertion hole 2 has an opening as shown in FIGS. 4 and 5. A pair of upstanding pieces 12 and 13 having different protruding dimensions are formed on opposite sides of the edge, more precisely, on the long side edge. Here, the width of the insertion hole 2 is formed with a dimension substantially equal to the thickness (H) of the flat heat exchange tube 3, for example, 1.93 mm, and the length (L) of one of the standing pieces 12 is a plate-like fin. 1 (P) (hereinafter referred to as a fin pitch), for example, 1.3 mm, and the length (L) of the other standing piece 13.
1) is a dimension obtained by subtracting the length (L) of the upright piece 12 from the width of the insertion hole 2, that is, the thickness (H) of the flat heat exchange tube 3, that is, 1.93-1.3 = 0.6 mm. It is formed in dimensions. Therefore, the upright angle of the standing piece 12 is set to 9
By setting it to 0 degree, the pitch (P) of the plate-like fins 1 can be secured to 1.3 mm.

Incidentally, the thickness (H) of the flat heat exchange tube 3
Is extremely thick, the resistance on the air side increases, and the air volume and the heat exchange amount decrease. Therefore, the thickness of the flat heat exchange tube 3 should be less than twice the fin pitch (P). preferable. On the other hand, in order to improve the heat exchange efficiency, it is necessary to arrange the plate-like fins 1 at a predetermined pitch (P), and make the thickness (H) of the flat heat exchange tube 3 thinner than the fin pitch (P). Then, the fin pitch (P) cannot be secured. Therefore, in order to secure the pitch (P) of the plate-like fins 1 to a predetermined dimension and improve the thermal conductivity, the following relationship needs to be established.

That is, it is necessary to satisfy P <H <2 × P (1).

In a state in which the above equation (1) is satisfied,
By setting the length (L) of the upright pieces 12 to be at least equal to or greater than the fin pitch (P) and setting the angle of the upright pieces 12 to be less than 90 degrees, the pitch (P) between the plate-like fins 1 is obtained. And the plate-like fin 1 and the flat heat exchange tube 3 can be uniformly in line contact or surface contact. Therefore, it is possible to improve the adhesion between the plate-like fin 1 and the flat heat exchange tube 3 and the heat conductivity, and to improve the heat exchange efficiency.

Here, the length (L) of the standing piece 12 is shown.
Is 1.3 mm, which is equivalent to the fin pitch (P), but the length (L) of the upright piece 12 is larger than the fin pitch (P), that is, 1.3 mm, and the cut-and-raised angle is 9 mm.
When the flat heat exchange tube 3 is inserted into the insertion hole 2 of the plate-like fin 1 by being formed in a curved shape at less than 0 degrees, the upright piece 12 has a spring property and is in close contact with the flat heat exchange tube 3. Can be done. Therefore, the adhesion between the plate-like fin 1 and the flat heat exchange tube 3 can be further improved.

To assemble the heat exchanger constructed as described above, first, a plurality of, for example, 500 plate-like fins 1 are arranged at an appropriate pitch between opposed jigs (not shown). Next, the flat heat exchange tube 3 is inserted into the insertion hole 2 of the plate-like fin 1, and the standing pieces 12 and 13 are brought into close contact with the surface of the flat heat exchange tube 3. Then, the plate-shaped fins 1 and the flat heat exchange tubes 3 and the headers 4 and 5 are integrally brazed by a method described later to form a heat exchanger.

In this case, as shown in FIG. 3B, an aluminum alloy layer 11 having a lower melting point than the flat heat exchange tube 3 and the plate-like fin 1 is formed on the surface of the flat heat exchange tube 3. The flat heat exchange tube 3 and the plate-like fin 1 are integrally brazed by contributing as a brazing material. Similarly, the flat heat exchange tube 3 and the headers 4 and 5 are integrally brazed. Here, Al-Si, Al-Cu or Al-Cu
A brazing material comprising -Si brazing material powder and a flux powder is applied to the surface of the flat heat exchange tube 3 and heated to a temperature equal to or higher than the melting temperature of the brazing material to form an aluminum alloy layer 11 on the extruded flat tube surface. Then, the flat heat exchange tube 3 and the plate-like fin 1 are brazed.

In the above description, an aluminum alloy layer 11 having a lower melting point than the flat heat exchange tube 3 and the plate-like fin 1 is formed on the surface of the flat heat exchange tube 3 to contribute as a brazing material. However, a similar aluminum alloy layer 11 may be formed on the surface of the plate-like fin 1 instead of the flat heat exchange tube 3. Further, a similar aluminum alloy layer 11 may be formed on both the flat heat exchange tube 3 and the plate fin 1, and the flat heat exchange tube 3 and the plate fin 1 may be integrally brazed.

In the above embodiment, the case where the upright pieces 12 and 13 are provided on the long sides of the insertion hole 2 of the plate-like fin 1 facing each other has been described. However, under the condition satisfying the relationship of the above equation (1), If the length of the upright piece is equal to or greater than the fin pitch (P), the number of the upright pieces may be one. That is, as shown in FIGS. 6 and 7, a cut 14 may be provided from one long side to the short side of the opening edge of the insertion hole 2 of the plate-like fin 1 to form the standing piece 15. Good.

With such a configuration, the pitch (P) between the plate-like fins 1 can be maintained at a predetermined interval, and the flat heat exchange tube 3 and the upright piece 15 are brought into surface contact with each other, and The heat exchange tube 3 and the opening edge provided with the cut 14 can be brought into line contact with each other, and can be brought into close contact by utilizing the spring property of the standing piece 15. Therefore, it is possible to improve the adhesion between the plate-like fin 1 and the flat heat exchange tube 3 and the heat conductivity, and to improve the heat exchange efficiency.

[0025]

As described above, according to the present invention,
The following excellent effects can be obtained.

(1) According to the first aspect of the present invention, the pitch of the plate-like fins can be ensured by the upright pieces, and the upright pieces are brought into line contact or surface contact with the flat heat exchange tube uniformly. Therefore, the heat exchange efficiency can be improved.

(2) According to the second aspect of the invention, by setting the angle of the erecting piece to be less than 90 degrees, the erecting piece can be more reliably brought into contact with the flat heat exchange tube. In addition to the above (1), it is possible to further improve the adhesion between the plate-shaped fin and the flat heat exchange tube and the heat exchange efficiency.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a heat exchanger of the present invention.

FIG. 2 is a sectional perspective view of a main part of the heat exchanger of FIG.

3A is a sectional view showing a main part of FIG. 1 and FIG.
It is a part enlarged sectional view (b).

FIG. 4 is a perspective view showing a standing piece provided in an insertion hole of a plate-like fin according to the present invention.

5A is a schematic front view showing an insertion hole and an upright piece, and FIG. 5B is a schematic sectional view thereof.

FIG. 6 is a perspective view showing another form of the standing piece according to the present invention.

7A and 7B are a schematic front view and a schematic cross-sectional view showing an upright piece and an insertion hole shown in FIG.

FIG. 8 is a perspective view of a conventional heat exchanger.

FIG. 9 is a cross-sectional view illustrating a main part of a conventional heat exchanger.

FIG. 10 is a schematic front view (a) showing a standing piece provided in an insertion hole of a plate-like fin in a conventional heat exchanger, and a schematic cross-sectional view thereof (b).

FIG. 11A is a schematic front view showing another standing piece provided in an insertion hole of a plate-like fin in a conventional heat exchanger, FIG. 11B is a schematic cross-sectional view thereof, and FIG. 11B is a schematic front view showing another standing piece. It is (c) and its schematic sectional drawing (d).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate-shaped fin 2 Insertion hole 3 Flat heat exchange tube 12,13,15 Standing piece H Thickness of flat heat exchange tube 3 L Length of stand-up piece 12,15 P Plate fin pitch

Claims (2)

[Claims] 1. A heat exchanger comprising: a plurality of plate-like fins arranged at an appropriate pitch; and a flat heat-exchange tube penetrating through an insertion hole provided in these plate-like fins. The relationship between the thickness (H) of the flat heat exchange tube and the pitch (P) of the plate-like fins is P <H <2 × P, and is cut and raised from the long side of the opening edge of the insertion hole facing the opening edge. The length (L) of one of the upright pieces is at least equal to or greater than the pitch (P) of the plate-like fins, and the upright pieces are brought into uniform contact with the flat heat exchange tube. Heat exchanger. 2. The heat exchanger according to claim 1, wherein the angle of the upright pieces is less than 90 degrees.