JP2001255039A - Heat exchanger for cooling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent condensate from reaching the lee side of a heat exchanger for cooling due to wind pressure and flying therefrom to the lee side by draining condensate produced on the surface of tubes or fins efficiently downward. SOLUTION: The heat exchanger 1 for cooling comprising a plurality of tubes 14, 15 having an inner passage 20 for heat exchange medium juxtaposed in the direction of ventilation, fins 16 being laid alternately with the tubes 14, 15, and tanks 2, 3 disposed at least on one side of the tubes 14, 15 wherein a drain path 25 is provided by spacing apart the tubes 14, 15 from each other.

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 bonding 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 in the tubes evaporates, thereby cooling the tubes, and cooling the air passing between the tubes through the tubes and the fins, while condensing the moisture in the air to form the tubes and the fins. Condensed water is generated on the surface of

The condensed water flies from the cooling heat exchanger due to the wind from the blower on the upstream side in the ventilation direction, causing problems such as the condensed water reaching the vehicle interior. For this reason,
The refrigerant evaporator according to the above patent application publication also has a groove extending along the tube longitudinal direction at the downstream end in the ventilation direction and the upstream end in the ventilation direction. A drain groove formed along the longitudinal direction of the tube is formed by recessing the partition between the passages so as to prevent condensed water from traveling along the tube surface and moving downstream in the ventilation direction. .

[0004]

However, from the viewpoint of cost reduction and the like, the applicant of the present application has proposed that a single brazing sheet be roll-homed instead of a tube formed by joining two molded plates face to face. Tubes formed by press working or the like have been used exclusively. And, among the tubes formed by the processing such as the roll homing, etc., a heat exchanger having only one heat exchange medium passage is developed in which a plurality of tubes are arranged in parallel in the ventilation direction and alternately stacked with fins in a plurality of stages. are doing.

[0005] In recent years, such heat exchangers have been required to be improved in function due to environmental problems and to be further reduced in size and weight. In particular, a thinner heat exchanger is required in the vehicle layout, and the fin pitch tends to be smaller in order to ensure performance, and clogging due to stagnation of condensed water becomes a major problem. The ventilation resistance is increased as compared with the conventional one. For this reason, improvement of drainage is also a major theme for improving the heat exchange medium capacity of the cooling heat exchanger.

Accordingly, an object of the present invention is to provide a cooling heat exchanger that can efficiently drain condensed water generated on the surfaces of tubes and fins downward.

[0007]

SUMMARY OF THE INVENTION A cooling heat exchanger according to the present invention has a plurality of tubes having a heat exchange medium passage therein and arranged in the ventilation direction, and the tubes are alternately laminated. Fins and a tank disposed at one end of the tube, and a drainage channel is provided by providing an interval between the tubes (claim 1). However, the heat exchange medium includes at least a tube partitioned into a plurality of heat exchange medium passages by partitions, fins alternately stacked with the tube, and a tank disposed at one end of the tube. A drainage passage penetrating in the stacking direction of the tubes may be provided in a partition section that divides the medium passage and the heat exchange medium passage (claim 2). According to such a configuration, the condensed water generated on the fins and tubes is
It moves downwind on the tube surface due to wind pressure,
The drainage channel formed between the tubes or the drainage channel formed in the tube prevents condensed water from moving to the leeward side of the cooling heat exchanger, and falls down at the end of the drainage channel to drain. Is done.

[0008] Further, at least one or more tubes having a heat exchange medium passage therein, fins alternately stacked with the tubes, and a tank disposed at one end of the tubes are provided. A drainage channel is provided between the tubes and opened in the stacking direction of the tubes, and a louver is formed in the fin. The center of the fin in the airflow direction is a portion where no louver is formed. The dimension of the tube is smaller than the width of the drainage passage in the ventilation direction (claim 3). Due to such an arrangement of the louver and the drainage channel, one end of the louver faces between the drainage channels, so that even if condensed water on the windward side of the drainage channel moves on the fins to the leeward side due to wind pressure, the position between the drainage channels. Since the louver serves as a guide and moves to the drain channel side to drain the water downward from the drain channel, the drainage of the cooling heat exchanger can be further improved.

In this cooling heat exchanger, a single brazing sheet is processed to form a tube. When the tube has a winding structure on the side along the short direction, The winding structure is arranged on the upstream side in the ventilation direction (Claim 4). By adopting such a tube arrangement, the windward side of the tube becomes thicker due to the 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, It is possible to extend the life of the tube.

The tank has an inlet side and an outlet side of the heat exchange medium arranged in parallel in the ventilation direction, and the inlet side and the outlet side communicate with each other through a heat exchange medium passage of the tube. Accordingly, the tank arranges the inlet side portion and the outlet side portion at an interval and connects the inlet side portion and the outlet side portion. The connecting portion may be provided with a drainage passage penetrating in the longitudinal direction of the tube. According to such a configuration, the condensed water that has dropped downward at the end of the drainage passage between the tubes or the drainage passage of the tube,
Further, since the water is drained out of the cooling heat exchanger through the drainage passage of the tank, the drainage of the cooling heat exchanger can be improved.

Further, the cooling heat exchanger may be a single tank type having only the tank, but a heat exchange medium communicating with an inlet side of the tank is provided on a side opposite to a side where the tank is disposed. It is also possible to use a two-tank type having a tank that allows the heat exchange medium to be turned back from the passage to the heat exchange medium passage communicating with the outlet side of the tank. In one or both of the single tank type and the double tank type, the tank may be integrally formed by extrusion molding. This allows
In the entrance / exit tank, the heat exchange medium is not directly bypassed between the entrance side and the exit side, and one of the openings has a substantially U-shaped deep drawing tank section and an end plate that closes this opening. In the case where the tank is formed by joining, it is possible to avoid a problem in which the heat exchange medium leaks from the gap to the outside due to poor joining. Further, it is possible to avoid problems such as freezing and destruction caused by infiltration of condensed water into a poor brazing portion such as a pinhole generated at a joint portion.

[0012]

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

The cooling heat exchanger 1 shown in FIGS. 1 to 5
Is a double tank type evaporator used for a vehicle, for example, and a tank 2 provided at one end in a longitudinal direction;
A tank 3 provided at one end opposite to the tank 2
And connected to this tank 2 and tank 3
Tubes 14 and 15 for communicating the tank and the tank 3, corrugated fins 16 alternately stacked on the tubes 14 and 15 in a plurality of stages, and end plates 17 and 17 arranged on both sides in the stacking direction. It is a two-pass system.

The tanks 2 and 3 are, as shown in FIG. 1, a cylindrical body 5 made of an aluminum alloy and having a tube connection hole 4 for connecting to the tubes 14 and 15, which will be described below. The tubular member 5 is formed integrally with the closing member 6 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 heat exchange medium does not leak from the side gap. In addition, it is possible to avoid problems such as freezing and destruction caused by infiltration of condensed water into a poor brazing portion such as a pinhole generated at a joint portion.

[0015] The tank 2 is a folded tank that allows the heat exchange medium whose openings on both sides thereof are closed by one closing plate 6 to be folded.
As shown in FIGS. 2 and 3, two partition walls 7, extending in the center of the inside of the tubular body 5 along the stacking direction of the tubes 10,
7, the inlet side 8 and the outlet side 9 are completely separated from each other, and a connecting part 10 is provided between the inlet side 8 and the outlet side 9.
Is an entrance / exit tank provided with an entrance side part 8,
Openings on both sides of the outlet side 9 are formed by connecting the two closing plates 6 to the cylindrical body 5.
And is closed by being inserted from the mounting hole 11 provided in the.

The partition walls 7, 7 of the tank 3 are formed integrally with the tubular body 5 by extrusion molding.
The partition is a separate member, and the heat exchange medium is not directly bypassed at the inlet side and the outlet side from the gap due to poor joining with the tank inner peripheral surface, and the performance of the heat exchanger is not deteriorated. An inlet pipe 12 is connected to an end of the inlet 8, and an outlet pipe 13 is connected to an end of the outlet 9.

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

On the other hand, the tubes 14 and 15 are
As shown in FIG. 3, a single brazing sheet is bent in a plurality of stages by roll homing or press working, and a pair of flat surfaces 18, 18 along the ventilation direction are formed.
And a flat surface 19 located on the leeward side and extending along the laminating direction.
And one heat exchange medium passage 20 surrounded by On the windward side of the tubes 14 and 15, a tightening portion 21 formed by winding the vicinity of the end portion is formed at one end, and the other end of the tube 14 and 15 is in contact with the base end side of the tightening portion 21. The contact portion 22 and a closing portion 23 connected to the contact portion 22 and closing the downstream opening of the heat exchange medium passage 20 are formed to form a winding structure.

As described above, by arranging the tubes 14 and 15 side by side so that the winding portion 21, the contact portion 22 and the closing portion 23 constituting the winding structure are on the windward side, the wind of the tubes 14 and 15 is increased. Since the upper side is thick, 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.
5 can be extended.

Each heat exchange medium passage 20 may be provided with an inner fin 24 as shown in FIGS. 4 and 5 in order to improve the agitation of the heat exchange medium. However, a plurality of beads may be formed inside a plane perpendicular to the ventilation direction. Further, the tubes 14 and 15 may be formed by extrusion molding or by joining two molding plates face-to-face. In the case of extrusion molding, the tubes 14 and 15 may have a plurality of heat exchange medium passages. .

By the way, the downstream end of the tube 14 and the upstream end of the tube 15 are not in contact with each other, and have flowed on the surface of the tube 14 to the leeward end by wind pressure as shown in FIG. The drainage channel 25 is provided by leaving an interval between the tube 14 and the tube 15 with an appropriate size such that the condensed water can drop downward before reaching the tube 15.

As shown in FIGS. 4 and 5, the fin 16 has a louver 26 which is partially cut and raised in the tube stacking direction in order to improve the heat exchange capacity. In this case, the width (LW) of the portion of the fin 16 where the louver 26 is not formed at the center in the ventilation direction is shown in FIG.
As shown in the figure, the size of the drainage passage 25 between the tubes 14 and 15 is smaller than the width (SW) in the ventilation direction.

The inlet side 8 and the outlet side 9 of the tank 3
As shown in FIGS. 2 and 3, the connecting portion 10 is connected to the connecting portion 10 in the longitudinal direction of the tubes 14 and 15.
0 is formed.

With the above configuration, FIG.
As shown in FIG. 2, the condensed water that has flowed on the surface of the tube 14 by wind pressure moves to the tube 15 further downstream as shown by the imaginary line, and consequently the heat exchanger 1 for cooling.
As shown by the solid line, the tube 14 falls downward at the downstream end of the tube 14, that is, at the end of the drainage channel 25, without flying downstream. Even if the condensed water on the leeward side of the drainage channel 25 moves on the fin 16 to the leeward side due to the wind pressure, the louver 2 located in the drainage channel 25 may be used.
6 serves as a guide, moves to the end of the drainage channel 25, and is drained downward from the drainage channel. The condensed water that has fallen downwards is drained to the outside of the cooling heat exchanger 1 from a drain hole 27 formed in a connecting portion 10 that connects the inlet side portion 8 and the outlet side portion 9 of the tank 3. Therefore, the cooling heat exchanger 1
Drainage of condensed water can be improved.

The configuration of the tube and the configuration of the drainage channel of the cooling heat exchanger 1 are not limited to those described above. Hereinafter, the cooling heat exchanger 1 using tubes having different configurations will be described with reference to FIGS. 7 and 8. However, the same components as those in the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The tube 28 shown in FIG. 7 is formed by bending a single brazing sheet in a plurality of stages by roll homing or pressing, and is provided with a flat surface 19 located on the leeward side and extending along the laminating direction. The upstream side has two heat exchange medium passages 20, 20 by providing the above-mentioned winding-up structure and joining it at the center in the ventilation direction to form a partition portion 29. Then, the partition 29 is attached to the tube 2
A drainage channel 30 penetrating in the stacking direction of No. 8 is formed.

With such a configuration, as shown in FIG. 8, the condensed water flowing downstream on the side surface of the heat exchange medium passage 20 located on the windward side of the tube 28 by wind pressure is imagined. As shown by the solid line, the tube 28 moves further on the side surface of the heat exchange medium passage 20 on the leeward side, and does not fly downstream of the cooling heat exchanger 1 in the ventilation direction. Of the condensed water of the cooling heat exchanger 1 can be improved. In this cooling heat exchanger 1 as well, the width (LW) of the portion of the fin 16 where the louver 26 is not formed at the center in the ventilation direction is shown in FIG.
As shown in (2), the size of the drainage passage 30 between the tubes 14 and 15 may be made smaller than the width (SW) in the ventilation direction, whereby the drainage of condensed water is further improved.

Finally, as described above, the tube 1
A drain passage 25 is provided between the tube 4 and the tube 15, and a partition 29 of the heat exchange medium passages 20, 20 of the tube 28 is provided.
In the configuration in which the drainage channel 30 is provided, the longitudinal direction of the tube of the heat exchanger is non-vertical (for example, horizontal).
Even if it is necessary to place these drains 25, 3
0 can fulfill the function of draining down the condensed water.
For this reason, it becomes possible to arrange at various places at various angles in the non-vertical direction, and the versatility as a heat exchanger is enhanced. In this case, although not shown, the end plate 1
It is desirable to provide a drainage passage at the position corresponding to the position of the drainage passage 25 in the end plate 17 in the stacking direction.

[0029]

As described above, according to the first and second aspects of the present invention, the condensed water generated in the fins and the tube moves downwind on the tube surface by the wind pressure. The condensed water is prevented from moving to the lowermost end of the cooling heat exchanger by the drainage channel formed between the tubes or the tube, and falls down at the end of the drainage channel. As a result, the amount of condensed water that collects on the downstream side of the cooling heat exchanger is reduced, thereby reducing the risk of clogging and flying.

According to the third aspect of the present invention, one end of the louver faces between the drainage channels due to the arrangement of the louvers and the drainage channels of the fins. Even if the louver is moved to the leeward side by wind pressure, the louver located between the drainage channels serves as a guide and moves to the drainage channel side to be able to drain down from the drainage channel. The drainage performance can be further improved. Also, since the condensed water hardly stays on the fin surface, even if the fin pitch is reduced to secure the performance while miniaturizing the cooling heat exchanger, the clogging due to the condensed water staying is suppressed. You can also.

According to the fourth aspect of the present invention, by arranging the tube to be fastened in the upstream direction in the ventilation direction, the upstream portion of the tube is thickened by the wound portion. 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.

According to the fifth and sixth aspects of the present invention, the condensed water that has fallen downward at the end of the drainage passage between the tubes or the drainage passage of the tube is further discharged by the drainage passage of the tank. Since the water is drained out of the cooling heat exchanger, the drainage of the cooling heat exchanger can be improved.

Further, according to the invention described in claim 8, the heat exchange medium does not directly bypass between the entrance side and the exit side in the entrance / exit tank, and the cross section of which one side is opened is substantially equal. When the tank is formed by joining the U-shaped deep drawing tank portion and the end plate that closes this opening, it is possible to avoid the problem that the heat exchange medium leaks from the gap to the outside due to poor joining. In addition, it is possible to avoid problems such as freezing and destruction caused by infiltration of condensed water into a poor brazing portion such as a pinhole generated at a joint portion.

[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 partial cross-sectional view showing a configuration of the above tank.

FIG. 3 is an explanatory diagram showing a state in which a cross section of the tank shown in FIG. 2 is viewed from the front.

FIG. 4 is an explanatory diagram showing an arrangement of two tubes and fins arranged in parallel in a ventilation direction and a configuration of a drainage channel.

FIG. 5 is an explanatory diagram showing a positional relationship between drainage channels between tubes and louvers of fins.

FIG. 6 is an explanatory diagram showing a state in which condensed water reaches a tube located on the downstream side and falls downward at an end of the drainage channel by adopting the configuration of the drainage channel shown in FIG. 4; .

FIG. 7 is an explanatory view showing an arrangement of tubes and fins having two heat exchangers and a configuration of a drainage channel.

8 shows a state in which the condensed water reaches the side surface of the heat exchange medium passage located on the downstream side by the configuration of the drainage channel shown in FIG. 7 and drops downward at the end of the drainage channel. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling heat exchanger 2 Tank 3 Tank 4 Tube connection hole 5 Cylindrical body 6 Closure member 7 Partition wall 8 Inlet side 9 Outlet side 10 Connecting part 11 Mounting hole 12 Inlet side pipe 13 Outlet side pipe 14 Tube 15 Tube 16 Fin 17 End plate 18 Flat surface 19 Flat surface 20 Heat exchange medium passage 21 Winding portion 22 Contact portion 23 Closure portion 24 Inner fin 25 Drainage channel 26 Louver 27 Drainage hole 28 Tube 29 Partitioning portion 30 Drainage channel

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Muneo Sakurada 39, Higashihara, Chiyo, Odai-gun, Osato-gun, Saitama Pref.

Claims (8)

[Claims] At least one of a plurality of tubes having a heat exchange medium passage therein and arranged in parallel in a ventilation direction, fins alternately stacked with the tubes, and a tank disposed at one end of the tubes. A cooling heat exchanger, wherein a drainage channel is provided by providing an interval between the tubes. 2. A system comprising at least a tube having an interior partitioned into a plurality of heat exchange medium passages by a partition, fins alternately stacked with the tube, and a tank disposed at one end of the tube. A cooling heat exchanger, wherein a drainage passage penetrating in a stacking direction of the tubes is provided in a partition section that divides the heat exchange medium passage and the heat exchange medium passage. 3. At least one or more tubes having a heat exchange medium passage therein, fins alternately stacked with the tubes, and a tank disposed at one end of the tubes. A drainage channel is provided between the tubes and opened in the stacking direction of the tubes, and a louver is formed in the fin. The center of the fin in the airflow direction is a portion where no louver is formed. Characterized in that the size of the tube is smaller than the width of the tube in the ventilation direction of the drainage channel. 4. When the tube has a winding structure on a side along the lateral direction, the tube is arranged such that the winding structure is on the upstream side in the ventilation direction. 4. The cooling heat exchanger according to 1, 2, or 3. 5. The tank has an inlet side and an outlet side of a heat exchange medium arranged in parallel in a ventilation direction, and the inlet side and the outlet side communicate with each other via a heat exchange medium passage of the tube. The cooling heat exchanger according to claim 1, wherein the heat exchanger is used. 6. The tank has a connecting portion that connects the inlet side portion and the outlet side portion with an interval between the inlet side portion and the outlet side portion, and has a connecting portion connecting the inlet side portion and the outlet side portion. The heat exchanger for cooling according to claim 1, 2 or 3, wherein a drainage passage penetrating in a longitudinal direction of the tube is provided. 7. A heat exchange medium from a heat exchange medium passage communicating with an inlet side of the tank to a heat exchange medium passage communicating with an outlet side of the tank on a side opposite to a side where the tank is disposed. The cooling heat exchanger according to claim 5, further comprising a tank that can be turned back. 8. The cooling heat exchanger according to claim 1, wherein the tank is integrally formed by extrusion molding.