JP2000097589A - Tube for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit correct brazing and prevent the occurrence of faulty jointing surely even when there is variation in a dimensional accuracy. SOLUTION: A tube for heat exchanger is constituted of a pair of tubular wall constituting bodies 10 and an inner fin 20. The pair of tubular wall constituting bodies 10 are provided with a U-shaped section respectively and a tubular configuration can be formed by coinciding the opposed tip ends of both side walls with each other. The internal area 21 of inner fin 20 is formed so as to have a section having a zigzag configuration and both side rim parts 22 are folded inward to provide folded parts 22a. The tubular wall constituting bodies 10 and the inner fin 20 are integrated through brazing to each other under a condition that the intermediate area 21 of the inner fin 20 are received in the U-shaped grooves of the pair of tubular wall constituting bodies 10 while the folded parts 22a of both sides of the same are pinched between the opposing tip ends of both side walls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger tube applied to a condenser of a car air conditioner.

[0002]

2. Description of the Related Art As a heat exchanger applied to a condenser for a car air conditioner, a heat exchanger (C) called a multi-flow type as shown in FIGS. It is in.

This heat exchanger (C) has a plurality of tubes for heat exchangers having both ends connected to both headers (H) and (H) between a pair of headers (H) and (H) extending along a vertical direction. (T) are arranged in parallel, outer fins (F) are respectively arranged between the tubes (T) and outside the outermost tube (T), and the outer fins (F) are further arranged. The side plate (P) is arranged outside.

Conventionally, as a tube (T) of such a heat exchanger (C), for example, as shown in FIGS. 8 and 9, a flat tube having a dimension in a height direction shorter than a dimension in a width direction. (T) may be adopted.

The tube (T) has a pair of tube wall structures (1) (1) having a U-shaped cross section and an intermediate region (2b).
And an inner fin (2) formed in a zigzag cross section. An intermediate region (2b) of the inner fin (2)
The two side walls (2a) are accommodated in the U-shaped grooves of the pair of tube wall structures (1) and (1), and the corresponding side walls of the pair of tube wall structures (1) and (1) are provided. (1a) The whole is integrated by brazing while being sandwiched between the tips of (1a).

[0006]

However, in such a heat exchanger tube (T) of the inner fin specification, both side walls (1) of the tube wall structure (1) are affected by dimensional errors and assembly errors. 1a) If there is any variation in the height dimension of (1a), the ends of both side walls of the tube wall structure (1) are attached to both side edges (2a) of the inner fin (2) over the entire length direction. It is not possible to achieve a sufficient close contact, and the brazing of the non-close contact portion is insufficient, and there is a possibility that poor joining may occur. In some cases, there is a problem that a gap is formed and refrigerant leakage may occur. Was.

The present invention solves the above-mentioned problems of the prior art, and can accurately perform brazing even if there is some variation in dimensional accuracy, and can reliably prevent the occurrence of defective bonding. It is an object to provide a tube for a heat exchanger.

[0008]

In order to achieve the above object, the heat exchanger tubes according to the present invention have U-shaped cross sections corresponding to each other, and are formed by matching the tips of the corresponding side walls. A pair of tube wall components formed in the, and the intermediate region is formed in a zigzag cross-section having alternating peaks and valleys,
Inner fins provided with folded portions provided with both side edges folded inward, and an intermediate region of the inner fins is accommodated in the U-shaped grooves of the pair of tube wall structures, and The gist is that the pair of tube wall components and the inner fins are integrated by brazing with each other in a state where the folded portion is sandwiched between the corresponding two side wall tips of the pair of tube wall components. .

In the tube for a heat exchanger of the present invention,
In a state where the folded portions at the inner fin both side edges are sandwiched between the ends of both side walls of the pair of tube wall components,
Since the brazing is integrated, the folded portion comes into close contact with the distal end surfaces of both side walls of the tube wall structure without a gap over the entire region in the tube length direction due to the restoring force of the folded portion against the pinching. For this reason, even if there is a dimensional error or the like in the tube wall structure, the tube wall structure and the fins can be securely joined and integrated over the entire area in the length direction.

Further, in the present invention, it is preferable to adopt a configuration in which a heat exchange medium passage hole is formed between a peak and a valley in an intermediate region of the inner fin.

That is, in the case of employing this configuration, the heat exchange medium such as the refrigerant flowing in the tube also flows in the tube width direction through the passage hole, so that the heat exchange medium is evenly dispersed in the tube. It can be distributed smoothly.

Further, in the present invention, a convex end is formed on the inner surface of the bottom wall of the tube wall structure corresponding to at least one of the upper end of the peak and the lower end of the valley in the intermediate region of the inner fin. It is desirable to adopt a configuration in which a section housing groove is formed and the convex end is housed in the convex end groove.

In other words, when this configuration is employed, the area of the inner fin to be joined to the tube wall structure is increased, and the joining strength and, consequently, the rigidity of the entire tube are increased. Further, the positioning of the fin with respect to the tube wall structure can be accurately performed simply by storing the protrusion of the inner fin in the groove for storing the protrusion of the tube wall structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> FIGS. 1 and 2
Is a heat exchanger tube (T) according to an embodiment of the present invention.
It is a figure which shows 1). As shown in the figure, this heat exchanger tube (T1) is used as a heat exchange tube of a multi-flow type heat exchanger or a parallel flow type heat exchanger as shown in FIGS. 6 and 7, for example. A pair of tube wall structures (10) (10)
And an inner fin (20).

As shown in FIGS. 1 and 2, a pair of tube wall structures (10) (10) are integrally formed on a bottom wall (11) and both side edges of the bottom wall (11). Side walls (1
2) (12), which are made of an extruded aluminum material having a wide U-shape in cross section and having both side walls (12) and (1) corresponding to each other.
By matching the tips of 2), it is configured to be formed in a tube shape with a flat rectangular cross section.

The inner fin (20) has an intermediate region (21) provided corresponding to the U-shaped groove (15) of the tube wall structure (10), and both side walls (12) of the tube wall structure (10). ) And (12), and is formed of a double-sided clad material made of an aluminum alloy having a brazing material layer laminated on both surfaces.

The intermediate region (2) of the inner fin (20)
1) is formed in a zigzag cross section having peaks (25a) and valleys (25b) alternately. Yamabe (25
The height dimension of the a) and the valley (25b) is formed corresponding to the height dimension (depth dimension) of the U-shaped groove (15) of the pair of tube wall structures (10). The intermediate region (21) is provided with the tube wall structure (1) as described later.
0), the upper end of the peak (25a) and the lower end of the valley (25b) are configured to contact the bottom surface of the U-shaped groove (15) when housed in the U-shaped groove (15). I have.

In the present embodiment, the cross section of the intermediate region (21) has an inverted U-shaped or V-shaped peak (25a) and a U-shaped or V-shaped valley (25b).
Are alternately formed, but in the present invention, as the cross-sectional shape of the intermediate region (21), a downward U-shaped peak and an upward U-shaped valley are formed alternately. Alternatively, a trapezoidal peak and an inverted trapezoidal valley may be alternately formed.

Both side edges (2) of the inner fin (20)
2) In (22), the folded portions (22a) (22a) are formed continuously in the length direction by folding the region along both side edges (22) and (22) inward. .

Further, as shown in FIG. 3, louvers are cut and raised at appropriate intervals in the length direction between the peaks (25a) and the valleys (25b) of the inner fin (20). , A plurality of refrigerant passage holes (26) are formed.

The middle region (21) of the inner fin (20) has the upper end of the ridge and the lower end of the valley at the U-shaped grooves (15) (15) of the pair of tube wall structures (10) (10).
(15) (15)
The folded portions (22a) (22a) at the side edges (22) and (22) are accommodated in the inside of the pair of tube wall structures (10) and (10). The tube wall structure (10) (10) and the inner fin (2)
0) are integrated with each other by brazing to form a heat exchanger tube (T1) of the present embodiment.

When the tube (T1) is integrated by brazing, together with the tube components (10) and (20),
The heat exchanger components such as the header, the outer fins and the side plates may be temporarily assembled as shown in FIG. 6 and brazed all at once, or the tube components (10) (20) Only the brazing may be integrated first, and the tube and other heat exchanger components may be assembled.

According to the heat exchanger tube (T1), the folded portions (22a) of the inner fin (20) on both sides are provided.
(22a) is replaced with a pair of tube wall structures (10) (1).
0), it is brazed and integrated in the state of being sandwiched by the corresponding end portions of the both side walls. (22a) is sufficiently tightly contacted with the distal end surfaces of both side walls of the tube wall structures (10) and (10) without gaps over the entire region in the tube length direction, and is brazed and integrated in that state. For this reason, even if there is an error in the height dimension of the tube wall structure (10), the tube wall structure (10) (10) can be joined and integrated without a gap over the entire length direction, It is possible to prevent the occurrence of poor joining and also to surely prevent refrigerant leakage.

In this embodiment, the intermediate region (21) of the inner fin (20) is interposed between the bottom walls (11) and (11) of the tube wall structures (10) and (10). The pressure in the tube height direction is changed to the middle area (2
Through 1), the tube can be received in a well-balanced manner over the entire region, so that the pressure resistance of the tube can be sufficiently ensured.

Further, in this embodiment, since the coolant passage hole (26) is formed in the inner fin (20),
Since the refrigerant flowing in the tube also flows in the width direction through the refrigerant passage hole (26), the refrigerant can be evenly dispersed in the tube and smoothly distributed while preventing the refrigerant flow from being biased. It is possible to improve the heat exchange efficiency.

<Second Embodiment> FIGS. 4 and 5 show a heat exchanger tube (T2) according to a second embodiment of the present invention.
FIG. As shown in both figures, in this heat exchanger tube (T2), a tube wall structure (10)
On the bottom surface of the U-shaped groove (15) in (10), the protrusion is continuously formed in the tube length direction corresponding to the upper end of the peak (25a) and the lower end of the valley (25b) in the inner fin (20). End storage grooves (15a) and (15b) are formed. The grooves (15a) and (15b) are formed, for example, by molding when extruding the tube wall structure (10).

The upper end of the ridge and the lower end of the valley (convex end) of the inner fin (20) are formed in the convex end storing groove (15a).
In the state stored in (15b), the tube wall structure (1)
0) (10) and the inner fin (20) are integrated by brazing.

The other configuration is the same as that of the first embodiment, and the description thereof will not be repeated.

According to the heat exchanger tube (T2), in addition to the above effects, the inner fin (20)
Of the fins (20) to the tube wall structure (10) because the protrusions of the fins (20) are housed in the protrusion end storage grooves (15a) and (15b) of the tube wall structures (10) and (10). As the area increases, the fillets are effectively formed and the tube wall structure (10) and fins (20)
And the rigidity of the entire tube is increased, and the pressure resistance of the tube can be further improved. Further, before brazing, the convex end (25) of the fin (20)
a) (25b) is replaced by a tube wall construct (10) (10)
Since the fins (20) can be positioned with respect to the tube wall structures (10) (10) by being housed in the grooves (15a) (15b), the tube assembling operation can be performed easily and accurately. .

In the second embodiment, the tube wall structures (10) and (10) correspond to both the upper end of the peak (25a) and the lower end of the valley (25b) of the fin (20). ) And the convex end storage grooves (15a) (15)
b) is formed, but in the present invention,
The protruding-end storage groove may be formed so as to correspond to at least one of the protruding ends of the upper end of the peak and the lower end of the valley.

[0031]

As described above, according to the heat exchanger tube of the present invention, a folded portion is formed along both side edges of the inner fin, and the folded portion corresponds between a pair of tube wall structures. Since it is brazed and integrated in the state of being sandwiched between the end portions of both side walls, the folded portion has a gap over the entire area in the tube length direction due to the restoring force of the folded portion with respect to the above-described entrapment. Be closely related. For this reason, even if the tube wall structure has a dimensional error or the like, the tube wall structure and the fins can be securely joined and integrated over the entire area in the longitudinal direction, and the occurrence of poor joining can be prevented, and the refrigerant can be prevented. There is an effect that leakage can be surely prevented.

In the present invention, when the coolant passage hole is formed in the inner fin, the coolant flowing through the tube flows in the tube width direction through the coolant passage hole, so that the coolant is evenly distributed in the tube. And has the advantage that heat exchange efficiency can be improved.

Further, in the present invention, a convex end receiving groove is formed in the tube wall structure corresponding to the convex end such as the upper end and the upper end of the valley of the inner fin, and the convex of the inner fin is formed in the groove. In the case of storing the end portion, the joining area of the fin to the tube wall structure is increased, and the joining strength, and thus the rigidity of the entire tube is increased, so that the pressure resistance of the tube can be further improved. By storing the convex end of the fin in the convex end storage groove of the tube wall structure, the positioning of the fin with respect to the tube wall structure can be achieved, so that the tube assembling operation can be performed easily and accurately. There is an advantage.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a heat exchanger tube according to a first embodiment of the present invention.

FIGS. 2A and 2B are cross-sectional views showing a heat exchanger tube according to the first embodiment, wherein FIG. 2A is a cross-sectional view in an assembled state, and FIG. 2B is a cross-sectional view in an exploded state.

FIG. 3 is a cutaway perspective view showing an enlarged part of an inner fin in the heat exchanger tube of the first embodiment.

FIG. 4 is an exploded perspective view showing a heat exchanger tube according to a second embodiment of the present invention.

FIGS. 5A and 5B are cross-sectional views showing a heat exchanger tube according to a second embodiment, wherein FIG. 5A is a cross-sectional view in an assembled state, and FIG. 5B is a cross-sectional view in an exploded state.

FIG. 6 is a front view showing a multi-flow heat exchanger as a condenser for a car air conditioner.

FIG. 7 is an exploded perspective view showing the periphery of a header of a multi-flow heat exchanger as a condenser for a car air conditioner.

FIG. 8 is an exploded perspective view showing a conventional heat exchanger tube.

FIG. 9 is a sectional view showing a conventional heat exchanger tube, in which FIG. 9A is a sectional view in an assembled state, and FIG. 9B is a sectional view in an exploded state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Tube wall structure 11 ... Bottom wall 12 ... Side wall 15 ... U-shaped groove 15a, 15b ... Convex end storage groove 20 ... Inner fin 21 ... Intermediate area 22 ... Side edge part 22a ... Folding part 25a ... Mountain part 25b ... Valley 26: refrigerant passage hole (heat exchange medium passage hole) T1, T2: tube for heat exchanger

Claims (3)

[Claims] 1. A pair of tube wall structures each having a U-shaped cross-section corresponding to each other and formed into a tube shape by matching the tips of the corresponding side walls, and an intermediate region having a peak and a valley. And the inner fins are formed in a zigzag cross-section having alternating portions, and both side edges are folded inward, and an inner fin provided with a folded portion is provided. While being housed in the U-shaped groove of the wall structure, the folded portions on both sides are sandwiched between the corresponding both side wall tips in the pair of tube wall structures, and the pair of tube wall structures and the A tube for a heat exchanger, wherein inner fins are integrated by brazing. 2. The heat exchanger tube according to claim 1, wherein a heat exchange medium passage hole is formed between a peak and a valley in an intermediate region of the inner fin. 3. A convex end storage groove is formed on the inner surface of the bottom wall of the tube wall structure, corresponding to at least one of the upper end of the peak and the lower end of the valley in the intermediate region of the inner fin. The heat exchanger tube according to claim 1, wherein the convex end portion is formed and the convex end portion is housed in the convex end portion groove.