JP2001255040A - Heat exchanger for cooling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for cooling having a drainageway exhibiting high drainage efficiency and compatible with a tube produced by machining one brazing sheet. SOLUTION: A tube 14 being employed in the heat exchanger 1 for cooling is produced by a machining step for forming, from one brazing sheet A, the flat parts 18, 18 of a heat exchanging medium passage 16 and a part 17 where the brazing sheet A is jointed to one end in the ventilating direction, and a step for making a drainageway 20 on the downstream side in the ventilating direction of the tube 14 which is incorporated during the machining step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling heat exchanger such as an evaporator used for an air conditioner for a vehicle.

[0002]

2. Description of the Related Art A cooling heat exchanger constituting a refrigeration cycle of a vehicle air conditioner is disclosed in JP-A-11-218368.
As shown in the publication, a tube provided with a plurality of refrigerant passages formed by face-to-face joining of a forming plate, a tank communicating with the refrigerant passage of the tube, and a corrugated fin alternately stacked with the tank. Is generally used. Then, the refrigerant flowing through the tubes evaporates, thereby cooling the tubes and cooling the air passing between the tubes via the tubes and the fins, and condensed water generated on the surfaces of the tubes and the fins as a result With respect to the length of the tube, a drainage groove formed by recessing the partition between the refrigerant passages of the tube and extending along the longitudinal direction of the tube and reinforcing pieces arranged on both sides of the tube are used. The water is discharged downward along a drainage groove extending along the direction.

[0003]

SUMMARY OF THE INVENTION However, the applicant of the present application has sought to reduce the manufacturing cost of tubes,
Rather than forming two molding plates by face-to-face bonding, one brazing sheet is pressed and roll-homed to form a tube with one heat exchange medium passage, and this tube is passed in the airflow direction. We are developing multiple heat exchangers for cooling. With respect to the tube having such a configuration, there is no partition part that separates the heat exchange medium passage from the heat exchange medium passage, and since there is no reinforcing piece, it is necessary to consider a drainage structure of another configuration.

Accordingly, an object of the present invention is to provide a cooling heat exchanger having a drainage groove which has a high drainage efficiency and can cope with a tube formed by processing one brazing sheet.

[0005]

SUMMARY OF THE INVENTION A cooling heat exchanger according to the present invention includes a tube having at least one heat exchange medium passage surrounded by at least a pair of flat portions along a ventilation direction. In a cooling heat exchanger composed of corrugated fins alternately stacked and a tank disposed at at least one end of the tube, the tube is formed by bending a single brazing sheet, A bent portion formed by bending the brazing sheet located at one end in the ventilation direction, a flat portion forming the heat exchange medium passage, and ends of the brazing sheet located at the other end in the ventilation direction are joined to each other. A drain is provided integrally with the tube at a downstream end of the tube in the ventilation direction (claim 1). The drain groove of the tube may be formed only on one flat portion of the tube (claim 2). Further, the drain groove of the tube may be formed on both flat portions of the tube.

As described above, by providing the drainage groove at one or both downstream end portions of the flat surface along the ventilation direction of the tube, when the heat exchanger is disposed in the air conditioning duct, the ventilation direction is increased by the wind. The condensed water that has been blown to the downstream side is captured by the drainage ditch, and is removed below the heat exchanger through the drainage ditch, thereby improving the drainage performance of the heat exchanger.

[0007] The joint portion of the tube may have a structure in which a portion near the end of the flat portion is wound (claim 4). The winding structure is provided on the upstream side in the ventilation direction (claim 5). By adopting such a tube arrangement, the windward side of the tube is thickened by this winding structure, so that it is possible to improve the corrosion resistance against corrosion caused by the attachment of dust and the like blown from the windward side. Thus, the life of the tube can be extended.

[0008]

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

A cooling heat exchanger 1 shown in FIGS. 1, 2 and 3 is a double tank type evaporator used for a vehicle, for example, and has a tank 2 provided at one longitudinal end and a tank 2 2, a tank 3 provided at one end opposite to the side 2, tubes 14, 14 connected to the tank 2 and the tank 3 to communicate the tank 2 and the tank 3,
This is a two-pass system composed of corrugated fins 15 alternately stacked with the tubes 14 and 14 and end plates 16 and 16 arranged on both sides in the stacking direction.

As shown in FIG. 1, the tank 2 and the tank 3 are made of an aluminum alloy tubular body 5 having a tube connection hole 4 for connecting to the tube 14 and a closing member described below. 6 and a cylindrical body 5
Are integrally formed by extrusion molding. With such a configuration, for example, as in a conventional tank including a substantially bowl-shaped deep drawing tank member having one opening and a closing member that closes the opening, the tank is formed due to poor joining between the deep drawing tank member and the closing member. The problem that the heat exchange medium leaks from the side gap is eliminated.

[0011] The tank 2 is a folded tank whose openings on both sides are closed by one closing plate 6 to allow the heat exchange medium to be folded.
The inside of the tubular body 5 is completely separated into two inlet sides 9 and an outlet side 10 by a partition wall 7 extending along the laminating direction of the tube 14, and both sides of the tubular body 5 are closed by two sheets each. The entrance / exit tank is closed by inserting the plates 6 and 6 from the mounting holes 11 and 11 provided in the cylindrical portion 5.

The partition wall 7 of the tank 3 is formed integrally with the cylindrical body 5 by extrusion molding. With this configuration, since the partition wall is a separate member, due to poor joining with the inner peripheral surface of the tank, the partition wall 7 has an entrance. The situation where the performance of the heat exchanger is deteriorated by bypassing the heat exchange medium directly between the side and the outlet side is eliminated. An inlet-side pipe 12 is connected to the inlet-side portion 9, and an outlet-side pipe 13 is connected to the outlet-side portion 10.

Since the cooling heat exchanger 1 is placed in a state where water always adheres thereto, zinc (Zn) is extruded onto the surfaces of the tanks 2 and 3 by a method of spraying later or by two-layer extrusion. The sacrificial layer is formed to improve the corrosion resistance by a method of forming a layer containing zinc on the surface in the state.

On the other hand, the tubes 14, 14 are formed by processing a single brazing sheet, and are shown in FIGS.
Has one heat exchange medium passage 16 at least surrounded by a pair of flat surfaces 18 along the ventilation direction and a flat surface 19 located on the leeward side and extending along the stacking direction. I have. Drainage grooves 20, 2, which are concaved in a U-shape from both sides in the stacking direction, are provided at the leeward end of the flat portion 18 in the ventilation direction.
0 is formed along the longitudinal direction of the tube 14. The joint 17 formed at one end of the tube 14 has a winding structure.
Is located on the windward side, and at the other end of the tube 14 is formed a contact portion 21 that is in contact with the base end side of the joint portion 17 and a closing portion 22 that is connected to the contact portion 21. ing.

As described above, the tubes 14, 14 are juxtaposed such that the joint portion 17 of the winding structure is on the windward side, so that the windward side of the tubes 14, 14 at the winding portion 17 is thick. Therefore, it is possible to improve the corrosion resistance against corrosion caused by the attachment of dust and the like blown off from the windward side, and to extend the life of the tube 14.

An example of a processing step for manufacturing the above-described tube 14 and a drain groove forming step of forming a drain groove 20 incorporated in this processing step will be described with reference to FIGS. 4 to 8.

First, as shown in FIG. 4, one end of a flat brazing sheet A is folded in multiple stages and wound up to form a joint 17, and at the opposite end, the joint 17 and its top are formed. The contact part 21 and the closing part 22 with which the contact is made are formed by bending in multiple stages.

Next, as shown in FIG. 5, the central portion of the brazing sheet A is bent inward in a substantially U-shape except for the width of the lamination of the tubes 14 to form a flat flat portion 19 and a flat portion 19. Drainage grooves 20 located on both sides of the flat portion 19 are formed. Then, in this process, the contact portion 21
Further, a flat flat portion 18 connecting the closing portion 22 and the drain groove 20 and a flat flat portion 18 connecting the joining portion 17 and the drain groove 20 are also formed.

Then, as shown in FIG.
Then, the flat portion 18 connected to the closing portion 22 and the flat portion 18 having the joint portion 17 are bent inward. In this processing step, the space between the flat portion 19 and the flat portion side portion of the drain groove 20 is compressed, and the flat portion 18 and the flat portion side portion of the drain groove 20 are brought into close contact with each other. Also, the flat part 1
By folding inward the inner side 8 and 18, the contact portion 21 is finally brought into contact with the inside of the side portion having the tightening portion 17 as shown in FIG. 7. As a result, the closed portion 22 closes the space between the flat portions 18.

Finally, as shown in FIG.
Is bent inward so that the lower portion of the joint portion 17 is in contact with the top of the contact portion 21 and the inner side surface of the tightening portion 17 is in contact with the upper surface of the closing portion 22. Through these steps, the tube 14 having the drain groove 20 is integrally formed. still,
Although not shown, this drain groove 20 is formed by forming only one drain groove 20 in the processing step of FIG.
May be provided only at the downstream end in the ventilation direction.

However, the joining portion 17 and the drain groove 20 of the tube 14 are not limited to those formed by the above-described configuration and processing steps, and may be as shown in FIGS. 9 and 10. Hereinafter, the configuration and processing steps of the joint 17 and the drainage groove 20 of the tube 14 will be described with reference to FIGS. 9 and 10. However, the same components as those in the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Among them, the tube 14 shown in FIG.
Is formed from a single brazing sheet A, and is common to the previous embodiment in having one heat exchange medium passage 16 opened on both sides.
A difference is that a joint 17 is provided on the windward side as a joint between the end portions, and a drain groove 20 is formed using a contact portion between the joints 17.

That is, although not shown, the tube 14 is formed, for example, by bending both ends of the brazing sheet A into a U-shape in the first step to form a joint 17,
In the process, the central part of the brazing sheet A is
After forming a flat portion 19 and flat portions 18 and 18 by bending while leaving the lamination width of 4 in the lamination direction, the protruding surfaces of the joint portions 17 are brought into contact with each other in the third step to form flat portions 18 and 18.
It is manufactured in a processing step that closes the gap. As a result, the outer peripheral surface of the joint 17 becomes the drain groove 20, so that the formation of the joint 17 and the formation of the drain groove 20 can be performed by one processing, and the processing steps can be simplified.
The dimension in the stacking direction from the joints 17, that is, from the vicinity of the opening of the drain groove 20 to the deepest portion, is substantially half the width of the tube 14 in the stacking direction.

On the other hand, the tube 1 shown in FIG.
4 is substantially the same as the tube 14 shown in FIG. 10 in its basic configuration and processing steps, except that only one end of the brazing sheet A is bent in a U-shape to form the joint 1.
7 is formed such that when the ends of the brazing sheet A come into contact with each other, the brazing sheet A has a drain groove 20 on only one side. As described above, since the joint 17 (drain 20) is formed only on one side, the dimension in the stacking direction from the vicinity of the opening of the joint 17 (drain 20) to the deepest portion is as shown in FIG. ) Is about twice as large. According to such a configuration, since only one joint 17 (drainage groove 20) is formed, the processing step of the tube 14 is further simplified.

[0025]

As described above, claims 1 and 2 have been described.
According to the invention described in claim 3, since the drain groove is located at the downstream end in the ventilation direction of the tube in which the condensed water is most easily concentrated, when the cooling heat exchanger is disposed in the air conditioning duct. Since the condensed water falls down the heat exchanger along the drainage groove, the drainage of the heat exchanger can be reliably improved.

According to the fourth and fifth aspects of the present invention, the tube is arranged so that the wind-up portion is on the windward side. Therefore, it is possible to improve the corrosion resistance against corrosion caused by the attachment of dust and the like blown off from the windward side, and to prolong the life of the tube.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a cooling heat exchanger according to the present invention.

FIG. 2 is a perspective view illustrating a configuration of a tube and a configuration of a drainage groove according to the embodiment of the heat exchanger of the above.

FIG. 3 is a plan view showing a configuration of a tube and a configuration of a drainage groove thereof according to the embodiment.

FIG. 4 is a view showing a first step of a processing step of forming a crimped portion and the like of the tube in the above.

FIG. 5 is a view showing a second step of a processing step of forming a drain groove and a flat portion of the tube in the above.

FIG. 6 is a process diagram showing a third process of bending the tube until the flat portions of the tube are close to each other.

FIG. 7 is a process diagram showing a fourth process of the working process of bending the tube-tightened portion of the above tube until it comes into contact with the contact portion and the closing portion.

FIG. 8 is a plan view showing a configuration of a tube formed by the processing steps of FIGS. 3 to 7;

FIG. 9 is a plan view showing a configuration of a tube according to an embodiment different from that of the above embodiment and a configuration of a drainage groove thereof.

FIG. 10 is a plan view showing a configuration of a tube according to an embodiment different from the tubes according to the above-described two embodiments and a configuration of a drainage groove thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling heat exchanger 2 Tank 3 Tank 14 Tube 15 Fin 16 Heat exchange medium passage 17 Joint 18 Flat part 20 Drainage groove A Brazing sheet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Muneo Sakurada 39, Higashihara, Chiyo, Odai-gun, Osato-gun, Saitama Prefecture F term (reference) 3L103 AA22 BB38 CC23 CC28 DD08 DD34

Claims (5)

[Claims] 1. A tube having one heat exchange medium passage at least surrounded by a pair of flat portions along a ventilation direction, a corrugated fin alternately stacked with the tube, and at least one end of the tube In a cooling heat exchanger configured with a tank disposed in the tube, the tube is formed by bending a single brazing sheet, and a bent portion obtained by bending the brazing sheet located at one end in the ventilation direction, The flat portion that forms the heat exchange medium passage, and a joining portion formed by joining the ends of the brazing sheet located at the other end in the ventilation direction, and the tube at the downstream end of the tube in the ventilation direction. A heat exchanger for cooling characterized by having an integral drain. 2. The cooling heat exchanger according to claim 1, wherein the drain groove of the tube is formed only on one flat portion of the tube. 3. The cooling heat exchanger according to claim 1, wherein the drainage grooves of the tube are formed in both flat portions of the tube. 4. The cooling heat exchanger according to claim 1, wherein the joint portion of the tube has a structure in which a portion near an end of the flat portion is wound. 5. The cooling heat exchanger according to claim 4, wherein the tube winding structure is provided on an upstream side in a ventilation direction.