JP2010014330A - Heat exchanger and method for manufacturing the heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger improved in dew condensate draining performance with an excellent contact state of a flat tube and a fin. <P>SOLUTION: A water conveying fin 13 in the heat exchanger 10 is formed integrally with a corrugated fin 12 out of one plate-like material and arranged outside a ventilating space and downstream of air flow passing through the ventilating space. The lower part of the upper water conveying fin 13 out of the vertically adjacent water conveying fins 13 is in proximity to or in contact with the upper part of the lower water conveying fin 13. The dew condensate produced at the flat tube 11 and the corrugated fin 12 is pushed by air flow to reach the water conveying fin 13 integral with the corrugated fin 12, and flows downward from there. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a heat exchanger provided with flat tubes and fins, and a method for manufacturing the heat exchanger.

  2. Description of the Related Art 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 in a state where the fin is bent into a corrugated shape 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 described in Patent Document 1, the condensed water falls from the notch when the condensed water grows to such a size that it can be dropped by its own weight, and the condensed water is periodically heat exchanged. It may stay in the vessel, and its drainage against 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. .

  On the other hand, in order to improve drainage, a heat exchanger is also provided that penetrates the fins with the flat tube inclined with respect to the horizontal plane (see Patent Document 2). According to the heat exchanger disclosed in Patent Document 2, the generated condensed water flows on the surface of the inclined flat tube, and therefore does not stay and become air resistance.

However, in the heat exchanger described in Patent Document 2, since the flat tube is fitted into the fin, the fin easily escapes in the longitudinal direction of the flat tube during brazing welding, and the flat tube and fin after brazing welding The contact state with the air becomes incomplete, and the heat exchange performance decreases.
Japanese Utility Model Publication No. 63-6632 JP-A-2005-121318

  The subject of this invention is providing the heat exchanger which the contact state of a flat tube and a fin is favorable and improved the drainage property with respect to dew condensation water.

  The heat exchanger according to the first invention includes a flat tube, a corrugated fin, and a water guide fin. The flat tubes are arranged in a plurality of stages in a state where the plane portion is directed in the vertical direction. The corrugated fins are arranged in a state of being bent into a corrugated space in a ventilation space sandwiched between vertically adjacent flat tubes. The water guide fins are integrally formed with the corrugated fins from a single plate-shaped material, and are disposed outside the ventilation space and upstream and / or downstream of the air flow passing through the ventilation space.

  In this heat exchanger, the dew condensation water generated in the flat tube and the corrugated fin is pushed by the air flow and is transferred to the water guiding fin integral with the corrugated fin and flows downward. As a result, drainage of the heat exchanger is improved. In addition, since the corrugated fin extends in a corrugated shape along the longitudinal direction of the flat tube, it is difficult to escape in the longitudinal direction of the flat tube during brazing welding, and the contact state between the flat tube and the corrugated fin after brazing welding is difficult. 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 guide fins on the upper side of the water guide fins adjacent in the vertical direction are close to or in contact with the lower water guide fins.

  In this heat exchanger, the dew condensation water that has descended from the upper water conduction fins moves to the lower water conduction fins due to the momentum at the time of descent, or the coupling of the dew condensation waters, and flows downward. Get better.

  A method for manufacturing a heat exchanger according to a third invention is a method for manufacturing a heat exchanger according to the first or second invention, wherein the corrugated fin is a plate-like material before being bent into a corrugated shape. And a second region that is to be a water guide fin. Of the boundary line between the first region and the second region, a cut line is provided in a portion excluding a range adjacent to the corrugated fin valley. When the first region is folded into a waveform, the second region is folded in a direction opposite to the folding direction of the first region.

  In this heat exchanger manufacturing method, since the corrugated fin and the water guide fin do not require a shearing process after being bent, an increase in manufacturing cost is suppressed. In addition, the number of parts is reduced by integrating the corrugated fins and the water guiding fins.

  A method for manufacturing a heat exchanger according to a fourth invention is a method for manufacturing a heat exchanger according to the first or second invention, wherein the corrugated fin is a plate-like material before being bent into a corrugated shape. And a second region that is to be a water guide fin. Of the boundary line between the first region and the second region, a cut line is provided in a portion excluding a range adjacent to the corrugated fin valley. In the second region, a notch is provided in a portion scheduled to be adjacent to the peak of the corrugated fin. When the first region is folded into a waveform, the second region is folded in a direction opposite to the folding direction of the first region.

  In this heat exchanger manufacturing method, since the corrugated fin and the water guide fin do not require a shearing process after being bent, an increase in manufacturing cost is suppressed. In addition, the number of parts is reduced by integrating the corrugated fins and the water guiding fins. Furthermore, since the part which becomes a trough of a water conveyance fin is notched originally, dew condensation water does not accumulate in a water conveyance fin.

  In the heat exchanger according to the first aspect of the invention, the dew condensation water generated by the flat tube and the corrugated fin is pushed by the air flow and transferred to the water guiding fin integral with the corrugated fin and flows downward, so that the heat exchanger drains well. In addition, since the corrugated fin extends in a corrugated shape along the longitudinal direction of the flat tube, it is difficult to escape in the longitudinal direction of the flat tube during brazing welding, and the contact state between the flat tube and the corrugated fin after brazing welding is difficult. Good.

  In the heat exchanger according to the second aspect of the invention, the dew condensation water that has descended from the upper water conduction fins moves to the lower water conduction fins due to the momentum of the descent or the coupling of the dew condensation waters and flows downward. The drainage is even better.

  In the method for manufacturing a heat exchanger according to the third invention, since the corrugated fin and the water guide fin do not require shearing after being bent, an increase in manufacturing cost is suppressed. In addition, the number of parts is reduced by integrating the corrugated fins and the water guiding fins.

  In the heat exchanger manufacturing method according to the fourth aspect of the present invention, since the portion that becomes the valley of the water conveyance fin is originally cut out, the condensed water does not accumulate in the water conveyance fin.

  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 front view of a heat exchanger according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a portion A in FIG. In FIG. 1, the heat exchanger 10 includes a flat tube 11, a corrugated fin 12, water guide fins 13, and a header 15.

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

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

  The heat transfer surface 12a is a portion that exchanges heat with the air flow B that passes through the ventilation space, and a louver 12c for efficiently exchanging heat is formed. 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 side of the heat transfer surface 12a is referred to as a “first surface” and the back side is referred to as a “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 fins 13)
In FIG. 2, the water guide fins 13 are located outside the ventilation space and protrude from the ventilation space to the downstream side of the air flow B. Among the water guide fins 13 adjacent in the vertical direction, the lower part of the upper water guide fin 13 is close to or in contact with the upper part of the lower water guide fin 13.

  FIG. 3 is a perspective view of the corrugated fins and the water guiding fins. In FIG. 3, the valley 12g of the corrugated fin 12 and the peak 13h of the water guiding fin are adjacent to each other, and in this embodiment, the corrugated fin 12 and the water guiding fin 13 are integrally formed from the same plate-like material. The valley 12g of the corrugated fin 12 and the peak 13h of the water guiding fin are smoothly connected.

(Manufacturing method of the corrugated fin 12 and the water guide fin 13)
FIG. 4 is a plan view of the plate-like material before the corrugated fins and the water guide fins are bent. In FIG. 4, the description of the louver 12c of the corrugated fin 12 is omitted. In FIG. 4, the plate-shaped material before the corrugated fins 12 and the water guide fins 13 are bent has a first region 121 to be the corrugated fins 12 and a second region to be the water guide fins 13. In this state, the first valley planned area 121g that becomes the valley 12g of the corrugated fin 12 and the second mountain planned area 122h that becomes the peak 13h of the water conveyance fin 13 are adjacent to each other, and the peak 12h of the corrugated fin 12 The 1st mountain planned area 121h which becomes and the 2nd valley planned area 122g which will become the valley part 13g of the water conveyance fin 13 adjoin. On the boundary line between the first region 121 and the second region 122, a cut line 123 is provided. However, the cut line 123 is not provided on the boundary line between the first valley planned area 121g and the second mountain planned area 122h.

  The plate-like material is bent so that both sides of the first valley planned area 121g are folded upward and both sides of the second mountain planned area 122h are folded downward. At this time, the first mountain planned area 121h moves upward, and the second valley planned area 122g moves downward. As a result, an integrated body in which the valley 12g of the corrugated fin 12 and the peak 13h of the water guiding fin 13 are connected is completed. In addition, the broken line X of FIG. 4 has shown the bending planned position.

(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 and FIG. 2, the refrigerant flowing in 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.

  In addition, how the refrigerant flows changes depending on the application or the degree of pressure loss of the refrigerant. For example, the pressure loss of the refrigerant may be suppressed by allowing the refrigerant to flow in the same direction in the plurality of flat tubes 11 at the same time. Hereinafter, another flow of the refrigerant will be described with reference to FIG. 1 again.

  First, 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 and second flat tubes 11 and flows toward the second header 152. The refrigerant reaching the second header 152 is evenly distributed to the refrigerant flow paths 11b of the third and fourth flat tubes 11 and flows toward the first header 151. The refrigerant reaching the first header 151 is distributed almost evenly to the refrigerant flow paths 11 b of the fifth and sixth flat tubes 11 and flows toward the second header 152. The refrigerant that has reached the second header 152 is distributed almost evenly to the refrigerant flow paths 11 b of the seventh and eighth flat tubes 11 and flows toward the header 151. Then, the refrigerant collected at the first header 151 flows out from the outlet 151b. As a result, the flow rate of the refrigerant passing through the refrigerant flow path 11b is lowered, and the pressure loss of the refrigerant is reduced.

  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, drainage of the surface of the heat exchanger is poor, and when used as an evaporator, the accumulated condensed water becomes resistance to air flow and heat exchange performance is improved. May decrease. However, in the heat exchanger 10 of the present embodiment, the condensed water does not stay because there are the water guide fins 13. Hereinafter, the flow of condensed water will be described with reference to the drawings.

  FIG. 5 is a partial cross-sectional view of the heat exchanger of FIG. 1 taken along a plane perpendicular to the longitudinal direction of the flat tube. In FIG. 5, the dew condensation water W generated on the heat transfer surface 12a of the corrugated fin 12 is pushed by the air flow B and moves downstream while descending the heat transfer surface 12a by gravity. Condensed water that has fallen to the flat portion 11a of the flat tube 11 and condensed water generated at the flat portion 11a are pushed by the airflow B and move downstream along the flat portion 11a. Moreover, the dew condensation water which descend | falls to the trough part 12g (refer FIG. 3) of the corrugated fin 12 is pushed by the airflow B, and moves downstream along the trough part 12g. Moreover, the dew condensation water which penetrate | invaded into the clearance gap between the trough part 12g of the corrugated fin 12 and the plane part 11a of the flat tube 11 moves downstream along a clearance gap by the capillary phenomenon by the clearance gap.

  Condensed water that has reached the downstream side of the corrugated fins 12 is pushed by the air flow B, moves to the mountain portion 13 h of the water guide fins 13 (see FIG. 3), and moves downward along the vertical plane of the water guide fins 13. As a result, drainage is better than that without the water guide fins 13.

<Features>
(1)
In the heat exchanger 10, the water guiding fins 13 are integrally formed with the corrugated fins 12 from a single plate-shaped material, and are arranged outside the ventilation space and downstream of the air flow passing through the ventilation space. Among the water guide fins 13 adjacent in the vertical direction, the lower part of the upper water guide fin 13 is in proximity to or in contact with the upper part of the lower water guide fin 13. Condensed water generated in the flat tube 11 and the corrugated fins 12 is pushed by the air flow and transmitted to the water guiding fins 13 integrated with the corrugated fins 12 and flows downward therefrom. Therefore, drainage is good. Further, since the corrugated fin 12 extends in a corrugated shape along the longitudinal direction of the flat tube 11, it is difficult to escape in the longitudinal direction of the flat tube 11 during brazing welding, and the flat tube 11 and the corrugated fin 12 after brazing welding. The contact state with is good.

(2)
In the heat exchanger 10, when the corrugated fin 12 is a plate-shaped material before being bent into a corrugated shape, the first region 121 that is to be the corrugated fin 12 and the second region 122 that is to be the water guide fin 13 are provided. is doing. Of the boundary line between the first region 121 and the second region 122, a cut line 123 is provided in a portion excluding a range scheduled to be adjacent to the valley 12 g of the corrugated fin 12. When the first region 121 is bent into a waveform, the second region 122 is bent in a direction opposite to the bending direction of the first region 121. As a result, the valley 12g of the corrugated fin 12 and the peak 13h of the water guiding fin 13 are connected to each other, and the condensed water generated in the corrugated fin 12 easily moves to the water guiding fin 13. Further, since the corrugated fins 12 and the water guide fins 13 do not require shearing after being bent, an increase in manufacturing cost is suppressed.

<Modification>
FIG. 6 is a perspective view of the corrugated fin and the water guiding fin according to the modified example, and FIG. 7 is a plan view of the plate-shaped material before the corrugated fin and the water guiding fin according to the modified example are bent. In addition, the same code | symbol is provided to the part same as the said embodiment, and description is abbreviate | omitted. 6 and 7, a valley portion of the water guide fin 13, that is, a portion corresponding to the valley portion 13 g (see FIG. 3) of the above embodiment is cut.

  As shown in FIG. 7, in the plate-shaped material before bending of the corrugated fin and the water guiding fin according to the modification, a cut line 123 is provided on the boundary line between the first region 121 and the second region 122. However, the cut line 123 is not provided on the boundary line between the first valley planned area 121g and the second mountain planned area 122h. Furthermore, the notch 124 is provided in the area | region which becomes a trough part of the water conveyance fin 13, ie, the area | region corresponded to the 2nd trough planned area 122g (refer FIG. 4) of the said embodiment.

  The plate-like material is bent so that both sides of the first valley planned area 121g are folded upward and both sides of the second mountain planned area 122h are folded downward. At this time, the first mountain planned area 121h moves upward, and the notch 124 moves downward. Thereby, the water conveyance fin 13 by which the trough part was cut | disconnected is formed, and the integral thing which the trough part 12g of the corrugated fin 12 and the peak part 13h of the water conveyance fin 13 were connected is completed.

<Features of modification>
In the heat exchanger 10 according to the modification, the condensed water that has descended along the vertical plane of the water guide fins 13 can be easily moved to the water guide fins 13 below without being blocked.

<Other embodiments>
In the said embodiment and modification, although the water conveyance fin 13 protrudes in the downstream of the airflow B from the ventilation space pinched | interposed into the flat pipe 11 adjacent to the upper and lower sides, it is not limited to this, The ventilation space To the upstream side of the air flow B.

  FIG. 8 is a partial cross-sectional view of a heat exchanger provided with water guide fins on the upstream side and the downstream side of the air flow. In FIG. 8, the water guiding fins 13 not only cause the condensed water to flow downward, but also increase the function as heat exchange fins.

  FIG. 9 is a partial cross-sectional view of a heat exchanger in which flat tubes are arranged in a plurality of rows in a plurality of rows in the air flow direction. In FIG. 9, the flat tubes 11 have two rows in the direction of the air flow B, and are arranged in a plurality of stages in the vertical direction. The water guide fins 13 are located upstream of the ventilation space sandwiched between the flat tubes 11 adjacent above and below the first row, downstream of the ventilation space sandwiched between the flat tubes 11 adjacent above and below the first row, and one row. It arrange | positions between the ventilation space of eyes, and the ventilation space of the 2nd row.

  In this heat exchanger 10, since the water guiding fins 13 are disposed between the first row ventilation space and the second row ventilation space, dew condensation generated in the first row of flat tubes 11 and the corrugated fins 12. The water is pushed by the air flow B and reaches the water guide fins 13 on the way to the downstream side and flows downward. As a result, the condensed water does not stay in the central portion of the heat exchanger 10.

  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 it can drain the condensed water even when the flat tubes are arranged in a plurality of stages in the vertical direction. is there.

The front view of the heat exchanger which concerns on one Embodiment of this invention. The expansion perspective view of the A section of FIG. The perspective view of a corrugated fin and a water guide fin. The top view of the plate-shaped raw material before bending of a corrugated fin and a water guide fin. The fragmentary sectional view when the heat exchanger of FIG. 1 is cut along a plane perpendicular to the longitudinal direction of the flat tube. The perspective view of the corrugated fin and water guide fin which concern on a modification. The top view of the plate-shaped raw material before bending of the corrugated fin and water guide fin which concern on a modification. The fragmentary sectional view of the heat exchanger provided with the water conveyance fin on the upstream and downstream sides of the air flow. The fragmentary sectional view of the heat exchanger which arranged the flat tube in multiple rows in the direction of air flow in multiple rows.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heat exchanger 11 Flat tube 11a Plane part 12 Corrugated fin 12g Corrugated fin valley part 12h Corrugated fin peak part 13 Water conveyance fin 121 1st area | region 122 2nd area | region 123 Cut line 124 Notch

Claims (4)

Flat tubes (11) arranged in a plurality of stages in a state where the flat surface portion (11a) is directed in the vertical direction;
A corrugated fin (12) arranged in a state of being bent into a corrugated shape in a ventilation space sandwiched between the flat tubes (11) adjacent vertically;
A water guide fin (13) integrally formed with the corrugated fin (12) from a single plate-like material, and disposed outside the ventilation space and upstream and / or downstream of the airflow passing through the ventilation space;
With
Heat exchanger (10). The water guide fins (13) on the upper side of the water guide fins (13) adjacent vertically are close to or in contact with the water guide fins (13) on the lower side,
The heat exchanger (10) according to claim 1. It is a manufacturing method of the heat exchanger (10) according to claim 1 or 2,
When the corrugated fin (12) is the plate material before being bent into the corrugated shape,
A first region (121) to be the corrugated fin (12);
A second region (122) to be the water guide fins (13);
Have
Of the boundary line between the first region (121) and the second region (122), a cut line (123) is formed in a portion excluding a range adjacent to the valley (12g) of the corrugated fin (12). Provided,
When the first region (121) is bent into the corrugated shape, the second region (122) is bent in a direction opposite to the bending direction of the first region (121).
Manufacturing method of heat exchanger (10). It is a manufacturing method of the heat exchanger (10) according to claim 1 or 2,
When the corrugated fin (12) is the plate material before being bent into the corrugated shape,
A first region (121) to be the corrugated fin (12);
A second region (122) to be the water guide fins (13);
Have
Of the boundary line between the first region (121) and the second region (122), a cut line (123) is formed in a portion excluding a range adjacent to the valley (12g) of the corrugated fin (12). Provided,
A notch (124) is provided in a portion of the second region (122) that is adjacent to the peak (12h) of the corrugated fin (12),
When the first region (121) is bent into the corrugated shape, the second region (122) is bent in a direction opposite to the bending direction of the first region (121).
Manufacturing method of heat exchanger (10).

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