JP2010065892A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger having improved water drainage performance with respect to condensation water. <P>SOLUTION: In the heat exchanger 10, flat tubes 11 are arranged at a plurality of stages with plane parts 11a facing vertically. Corrugated fins 12 are arranged in ventilation spaces sandwiched between the flat tubes 11 vertically adjacent to each other. Water introduction parts 13 are arranged outside the ventilation spaces and extended to the vertical direction while connected to the flat tubes 11. In the water introduction parts 13 vertically adjacent to each other, the lower part of the water introduction part 13 positioned on the upper side is brought into contact with the upper part of the water introduction part 13 positioned on the lower side. Due to this structure, condensation water is easily made to flow downwardly via the water introduction parts 13, so as to improve water drainage. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a heat exchanger provided with flat tubes and fins.

  Conventionally, a heat exchanger in which a flat portion of a flat tube is horizontal and fins are disposed between the flat portion and the flat portion has been widely used. In such a heat exchanger, since the fins are divided by the flat tube, the condensed water stays and becomes ventilation resistance. In order to eliminate the retention of the condensed water, a heat exchanger is provided in which a protrusion is protruded from the end of the fin to the downstream side of the air flow, and a notch is provided in the protrusion (see Patent Document 1). ). According to the heat exchanger disclosed in Patent Document 1, the generated condensed water is pushed by the air flow, gathers on the downstream side, and falls downward through the notch.

However, in the heat exchanger as described above, the condensed water falls from the notch when the condensed water has grown to a size that can be dropped by its own weight, and the condensed water periodically enters the heat exchanger. It may stay, and the drainage of condensed water is low. In addition, in a situation where further downsizing of the heat exchanger is progressing, the downsizing of the heat exchanger is likely to reduce the drainability of the heat exchanger with respect to the dew condensation water, so further improvement in drainage is required. .
Japanese Utility Model Publication No. 63-6632

  The subject of this invention is providing the heat exchanger which improved the drainage property with respect to dew condensation water.

  The heat exchanger according to the first aspect of the present invention includes a flat tube, fins, and a water conduit. The flat tubes are arranged in a plurality of stages in a state where the plane portion is directed in the vertical direction. The fins are arranged in a ventilation space sandwiched between flat tubes adjacent vertically. The water guide portion is disposed in an outer space that is out of the ventilation space, and extends upward and / or downward in a state of being connected to the flat tube. In the water guide section adjacent vertically, the lower part of the water guide section located on the upper side is in contact with the upper part of the water guide section located on the lower side.

  In this heat exchanger, since the water guide portions adjacent in the vertical direction are in contact with each other, the condensed water on the fin surface easily flows downward through the water guide portion, and drainage is good.

  A heat exchanger according to a second aspect of the present invention is the heat exchanger according to the first aspect of the present invention, wherein the water conduit is integral with the flat tube. In this heat exchanger, since the number of parts and the number of work steps are reduced, an increase in manufacturing cost is suppressed.

  A heat exchanger according to a third aspect of the present invention is the heat exchanger according to the second aspect of the present invention, wherein the flat tube is initially formed with a protruding portion extending toward the outer space. The water guide portion is formed by twisting the protruding portion in the vertical direction. In this heat exchanger, processing is simple and productivity is improved.

  A heat exchanger according to a fourth aspect of the present invention is the heat exchanger according to the first aspect of the present invention, wherein the water guide portion is a plate-like member that contacts the flat tube and is independent of the flat tube and the fin. In this heat exchanger, since the water guide is plate-shaped, the width, length, and inclination angle can be easily adjusted.

  A heat exchanger according to a fifth aspect of the present invention is the heat exchanger according to the fourth aspect of the present invention, wherein the water conduit is sandwiched between the flat portion of the flat tube and the fins. In this heat exchanger, since the flat tube, the fin, and the water guide portion can be joined at the same time, an increase in manufacturing cost is suppressed.

  In the heat exchanger according to the first aspect of the invention, since the water guide portions adjacent in the vertical direction are in contact with each other, the dew condensation water on the fin surface easily flows downward through the water guide portion, and the drainage is good.

  In the heat exchanger according to the second invention, the number of parts and the number of work steps are reduced, so that an increase in manufacturing cost is suppressed.

  In the heat exchanger according to the third invention, the processing is simple and the productivity is improved.

  In the heat exchanger according to the fourth aspect of the present invention, since the water guide portion is plate-shaped, it is easy to adjust the width, length, and inclination angle.

  In the heat exchanger according to the fifth aspect of the present invention, the flat tube, the fins, and the water guide portion can be joined at the same time, so that an increase in manufacturing cost is suppressed.

  Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are specific examples of the present invention and do not limit the technical scope of the present invention.

<Configuration of heat exchanger 10>
FIG. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the heat exchanger in a plane perpendicular to the longitudinal direction of the flat tube. 1 and 2, the heat exchanger 10 includes a flat tube 11, a corrugated fin 12, a water guide portion 13, and a header 15.

(Flat tube 11)
The flat tube 11 is formed from aluminum or an aluminum alloy, and includes a flat portion 11a serving as a heat transfer surface and a plurality of refrigerant flow paths 11b through which a refrigerant flows (see FIG. 2). As shown in FIG. 2, the flat tubes 11 are arranged in a plurality of stages with the flat surface portion 11a facing up and down.

(Waveform fin 12)
The corrugated fin 12 is a fin made of aluminum or aluminum alloy bent into a corrugated shape. As shown in FIG. 2, the corrugated fins 12 are arranged in a ventilation space sandwiched between upper and lower flat tubes 11, and a valley portion and a mountain portion are in contact with a flat portion 11 a of the flat tube 11. In addition, the trough part, the peak part, and the plane part 11a are brazed and welded.

  The heat transfer surface 12a is a part that exchanges heat with the airflow A that passes through the ventilation space, and has a louver 12c for efficiently exchanging heat. Louver 12c forms an opening penetrating from one surface of heat transfer surface 12a to the other surface. For convenience of explanation, in the front view of FIG. 2, the front surface of the heat transfer surface 12 a is referred to as “first surface” and the back surface is referred to as “second surface”. The louver 12c group located upstream from the center of the heat transfer surface 12a is inclined so that the air flow flows from the second surface to the first surface, and the louver 12c located downstream from the center of the heat transfer surface 12a. The group is tilted so that the airflow flows from the first surface to the second surface.

(Water guide 13)
The water guide portion 13 is located outside the ventilation space sandwiched between the vertically adjacent flat tubes 11, the longitudinal direction of the water guide portion 13 extends in the vertical direction, and the width direction of the water guide portion 13 extends in parallel with the air flow A. ing. In the water guide part 13 adjacent to the up-down direction, the lower part of the water guide part 13 located on the upper side is close to or in contact with the upper part of the water guide part 13 located on the lower side.

  The water guide portion 13 is in contact with the upper flat portion 11a of the flat tube 11, and is integrally formed with the upper flat portion 11a of the flat tube 11 in this embodiment. Hereinafter, the manufacturing method of the flat tube 11 and the water guide part 13 is demonstrated using drawing.

  FIG. 3 is a cross-sectional view of a flat tube being manufactured. In FIG. 3, in step P <b> 1, the flat container 11 v in which a plurality of concave groove-like refrigerant channels 11 b are formed and the flat plate 11 p having the flat portion 11 a and the water guide portion 13 are bonded together. In the process P2, the flat container 11v and the flat plate 11p are joined by brazing welding.

  In the process P3, the water guide 13 is twisted around the connecting portion 11j with the flat surface portion 11a so as to face in the vertical direction. Here, the planar state of the flat plate 11p before the water guide portion 13 is twisted will be described. FIG. 4 is a plan view of a flat plate of a flat tube being manufactured. In FIG. 4, in the flat plate 11p, the plane part 11a and the water guide part 13 are only connected by the connection part 11j, and other than the connection part 11j is divided by the cut line 11s. Adjacent water guide portions 13 are also separated by a cut line 11s. Thus, the water guide part 13 is easily twisted around the connection part 11j. In this embodiment, since the water guide part 13 is twisted about 90 degrees centering on the connection part 11j, the water guide part 13 is substantially parallel to the perpendicular direction.

(Header 15)
In FIG. 1, the header 15 is connected to both ends of flat tubes 11 arranged in a plurality of stages in the vertical direction. For convenience of explanation, the header on the right side in FIG. 1 is called “first header 151”, and the header on the left side is called “second header 152”. The first header 151 and the second header 152 have a function of supporting the flat tube 11, a function of guiding the refrigerant to the refrigerant flow path 11b of the flat pipe 11, and a function of collecting the refrigerant that has come out of the refrigerant flow path 11b. Have.

(Refrigerant flow)
In FIG. 1, the refrigerant flowing from the inlet 151 a of the first header 151 is distributed almost evenly to the respective refrigerant flow paths 11 b of the uppermost flat tube 11 and flows toward the second header 152. The refrigerant reaching the second header 152 is evenly distributed to the respective refrigerant flow paths 11b of the second-stage flat tube 11 and flows toward the first header 151. Thereafter, the refrigerant in the odd-numbered flat tubes 11 flows toward the second header 152, and the refrigerant in the even-numbered flat tubes 11 flows toward the first header 151. And the refrigerant | coolant in the flat tube 11 of the lowest level and the even-numbered level flows toward the 1st header 151, gathers at the 1st header 151, and flows out from the exit 151b.

  When the heat exchanger 10 functions as an evaporator, the refrigerant flowing through the refrigerant flow path 11b absorbs heat from the air flow flowing through the ventilation space via the corrugated fins 12. When the heat exchanger 10 functions as a condenser, the refrigerant flowing through the refrigerant flow path 11b radiates heat to the air flow flowing through the ventilation space via the corrugated fins 12.

(Flow of condensed water)
In general, when the flat tubes 11 are arranged with the flat portion 11a facing up and down, the water on the surface of the heat exchanger is poorly drained, and when used as an evaporator, the accumulated condensed water becomes the resistance of the air flow A and heat exchange performance. May decrease. However, in the heat exchanger 10 of this embodiment, as shown in FIG. 1 and FIG. 2, since there is a water guide portion 13, the condensed water flows downward through the water guide portion 13. Hereinafter, the flow of condensed water will be described with reference to the drawings.

  In FIG. 2, the dew condensation water W generated on the heat transfer surface 12a of the corrugated fin 12 is pushed by the air flow A and moves downstream while descending the heat transfer surface 12a by gravity. Condensed water descending to the valleys of the corrugated fins 12 is also pushed by the air flow A and moves downstream. In addition, the dew condensation water that has entered the gap between the valley of the corrugated fin 12 and the flat portion 11a of the flat tube 11 moves downstream due to the capillary phenomenon caused by the gap and the wind pressure of the airflow A. The condensed water that has reached the downstream end of the corrugated fin 12 is pushed by the air flow A and moves to the water guide section 13 located outside the ventilation space, and further along the water guide section 13, the water guide section 13 further below. Move to.

<Features>
In the heat exchanger 10, the flat tubes 11 are arranged in a plurality of stages with the flat surface portion 11a facing in the vertical direction. The corrugated fins 12 are arranged in a ventilation space sandwiched between flat tubes 11 adjacent in the vertical direction. The water guide portion 13 is disposed outside the ventilation space and extends in the vertical direction in a state of being connected to the flat tube 11. In the water guide part 13 adjacent to the upper and lower sides, the lower part of the water guide part 13 located on the upper side is in contact with the upper part of the water guide part 13 located on the lower side. Well drained. Since the water guide part 13 is integral with the flat tube 11, the number of parts and work man-hours are reduced, and the increase in manufacturing cost is suppressed. Moreover, since the water conveyance part 13 is formed when the part which protruded outside the ventilation space among the plane parts 11a above the flat tube 11 is twisted up and down, processing is simple and productivity is high.

<Modification>
In the said embodiment, although the water guide part 13 and a part of flat tube 11 are integrally molded, it is not limited to it. Hereinafter, modified examples of the water guide section will be described with reference to the drawings. FIG. 5 is a perspective view of a heat exchanger according to a modification, and FIG. 6 is a partial cross-sectional view of the heat exchanger in a plane perpendicular to the longitudinal direction of the flat tube of FIG. In addition, the same code | symbol is provided to the same member as the said embodiment, and description is abbreviate | omitted.

(Flat tube 111)
The flat tube 111 is formed from aluminum or an aluminum alloy, and includes a flat portion 111a serving as a heat transfer surface and a plurality of refrigerant channels 111b through which a refrigerant flows (see FIG. 6). The flat portion 111a and the refrigerant flow path 111b of the flat tube 111 are integrally formed by extrusion processing or drawing processing. As shown in FIG. 6, the flat tubes 111 are arranged in a plurality of stages with the flat portion 111 a facing up and down.

(Water guide part 113)
5 and 6, the water guide portion 113 is located outside the ventilation space sandwiched between the vertically adjacent flat tubes 111, the longitudinal direction of the water guide portion 113 extends vertically downward, and the width direction of the water guide portion 113 is It extends parallel to the air flow. In the water guide part 113 adjacent to the up-down direction, the lower part of the water guide part 113 located on the upper side is close to or in contact with the upper part of the water guide part 113 located on the lower side.

  The water guide portion 113 is in contact with the upper flat portion 111a of the flat tube 111, and in this embodiment, a part of the water guide portion 113 includes the upper flat portion 111a of the flat tube 111 and the valley portion of the corrugated fin 12. It is sandwiched between. Hereinafter, the manufacturing method of the water conveyance part 113 is demonstrated using drawing.

  FIG. 7 is a plan view of the material of the water guide section of the heat exchanger according to the modification. In FIG. 7, the material of the water guide portion 113 includes the water guide portion 113 and a holding portion 114 sandwiched between the flat portion 111 a of the flat tube 111 and the valley portion of the corrugated fin 12. The water guide part 113 and the holding | maintenance part 114 are only connected by the connection part 114j, and other than the connection part 114j is parted by the cut line 114s. Further, adjacent water guide portions 113 are also separated by a cut line 114s.

  FIG. 8 is a cross-sectional view in the middle of formation of the water conduit of the heat exchanger according to the modification. In FIG. 8, in the process P11, the divided material is set to the water guide part 113 and the holding part 114. The water guide part 113 and the holding | maintenance part 114 are connected only by the connection part 114j. In the process P12, the water guide portion 113 is bent downward by approximately 90 ° around the connecting portion 114j so as to face vertically downward. In the process P13, the connecting portion 114j is twisted so that the width direction of the water guide portion 113 intersects the longitudinal direction of the holding portion 114. In the present embodiment, since the water guide portion 13 is twisted by approximately 90 ° around the connecting portion 114j, when the holding portion 114 is sandwiched between the flat tube 111 and the corrugated fins 12, the water guide portion 113 is in the direction of the air flow. Become parallel.

<Features of modification>
In the heat exchanger 10, since the lower part of the water guide part 113 located on the upper side is in contact with the upper part of the water guide part 113 located on the lower side, the dew condensation water easily flows downward through the water guide part 113, and the water is damaged. Good. Moreover, since the water guide part 113 is pinched | interposed into the flat part 111a and the corrugated fin 12 of the flat tube 111, since the flat tube 111, the corrugated fin 12, and the water guide part 113 can be performed simultaneously, an increase in manufacturing cost increases. It is suppressed.

  As described above, the heat exchanger according to the present invention is useful for a heat exchanger of an air conditioner and a radiator of an automobile because water can be drained from the condensed water even when the flat tube is arranged to be horizontal. is there.

The perspective view of the heat exchanger which concerns on one Embodiment of this invention. The fragmentary sectional view of the heat exchanger in the plane perpendicular | vertical to the longitudinal direction of the flat tube of FIG. Sectional drawing of the flat tube in the middle of manufacture. The top view of the flat plate of the flat tube in the middle of manufacture. The perspective view of the heat exchanger which concerns on a modification. The fragmentary sectional view of the heat exchanger in the plane perpendicular | vertical to the longitudinal direction of the flat tube of FIG. The top view of the raw material of the water guide part of the heat exchanger which concerns on a modification. Sectional drawing in the middle of the water conveyance part of the heat exchanger which concerns on a modification being formed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heat exchanger 11,111 Flat tube 11a, 111a Plane part 12 Corrugated fin 13,113 Water conveyance part

Claims (5)

Flat tubes (11, 111) arranged in a plurality of stages with the flat portions (11a, 111a) oriented in the vertical direction;
A fin (12) disposed in a ventilation space sandwiched between the flat tubes (11, 111) adjacent vertically;
A water guide section (13, 113) disposed in an outer space outside the ventilation space and extending upward and / or downward while being connected to the flat tube (11, 111);
With
In the water guide part (13) adjacent vertically, the lower part of the water guide part (13, 113) located on the upper side is in contact with the upper part of the water guide part (13, 113) located on the lower side,
Heat exchanger (10). The water conduit (13) is integral with the flat tube (11).
The heat exchanger (10) according to claim 1. The flat tube (11) is initially formed with a protrusion extending toward the outer space,
The water guide portion (13) is formed by twisting the protruding portion in the vertical direction.
The heat exchanger (10) according to claim 2. The water guiding portion (113) is a plate-like member that contacts the flat tube (111), and is independent of the flat tube (111) and the fin (12).
The heat exchanger (10) according to claim 1. The water guide portion (113) is sandwiched between the flat portion (111a) and the fin (12) of the flat tube (111).
The heat exchanger (10) according to claim 4.

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