JP2018115804A - Heat exchanger and outdoor unit for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger that has improved corrosion resistance, and to provide an outdoor unit for an air conditioner.SOLUTION: A heat exchanger includes: a plurality of fins 21; a plurality of heat transfer pipes 22 penetrating the fins 21 and having a flat cross sectional shape; and a header pipe 23 to which the heat transfer pipes 22 are connected. The header pipe 23 has a plurality of processing parts 24A to which the heat transfer pipes 22 are connected. The processing part 24A includes: a hole part 25 into which the heat transfer pipe 22 is inserted; and an erecting part 26A erecting toward the outside of the header pipe from the hole part.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a heat exchanger and an outdoor unit of an air conditioner.

  Patent Document 1 describes a heat exchanger in which a header collecting pipe (header pipe) is connected to the ends of a plurality of flat tubes, and a heat transfer pipe is connected to a recess formed in the header collecting pipe.

JP2015-152209A

  However, in the heat exchanger described in Patent Document 1, since the heat transfer tube is connected to the recess, the exposed area of the heat transfer tube increases and the risk of corrosion of the heat transfer tube increases. In particular, when aluminum is used for the heat transfer tube, pitting corrosion which is a form of local corrosion in the depth direction is likely to occur, and the risk of penetration of the heat transfer tube increases.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a heat exchanger and an outdoor unit of an air conditioner having improved corrosion resistance.

  The present invention includes a plurality of fins, a plurality of heat transfer tubes having a flat cross-sectional shape that penetrates the plurality of fins, and a header tube to which the plurality of heat transfer tubes are connected, and the header tube includes the plurality of the heat transfer tubes. A plurality of processed portions to which the heat transfer tubes are connected, and the processed portions include a hole portion into which the heat transfer tubes are inserted, and a rising portion that rises from the hole portions toward the outside of the header tube. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the outdoor unit of the heat exchanger and air conditioner which improved corrosion resistance can be provided.

It is a systematic diagram which shows the refrigerant circuit of the air conditioner which concerns on this embodiment. It is a disassembled perspective view which shows the outdoor unit of the air conditioner which concerns on this embodiment. It is the schematic which shows the outdoor heat exchanger used for the outdoor unit of an air conditioner. The outdoor heat exchanger of the air conditioner which concerns on 1st Embodiment is shown, (a) is a longitudinal cross-sectional view, (b) is the sectional view on the AA line of (a). The outdoor heat exchanger of the air conditioner which concerns on 2nd Embodiment is shown, (a) is a longitudinal cross-sectional view, (b) is the BB sectional drawing of (a). The outdoor heat exchanger of the air conditioner which concerns on 3rd Embodiment is shown, (a) is a longitudinal cross-sectional view, (b) is CC sectional view taken on the line of (a). The outdoor heat exchanger of the air conditioner which concerns on 4th Embodiment is shown, (a) is a longitudinal cross-sectional view, (b) is the DD sectional view taken on the line of (a). It is a longitudinal cross-sectional view of the outdoor heat exchanger of the air conditioner which concerns on 5th Embodiment. It is a longitudinal cross-sectional view of the outdoor heat exchanger of the air conditioner which concerns on 6th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the common part in each figure, and the overlapping description is abbreviate | omitted.
(First embodiment)
FIG. 1 is a system diagram showing a refrigerant circuit of an air conditioner according to the present embodiment.
As shown in FIG. 1, an air conditioner 100 is installed in an outdoor unit 1 (an outdoor unit of an air conditioner) installed outside (non-air conditioned space) on the heat source side and indoors (air conditioned space) on the usage side. The indoor unit 2 is provided. The outdoor unit 1 and the indoor unit 2 are connected by refrigerant pipes 3 and 3.

  The outdoor unit 1 includes a compressor 4, a four-way valve 5, an outdoor heat exchanger 6, an outdoor fan 7, and an expansion valve 9. The outdoor fan 7 is usually a propeller fan. The indoor unit 2 includes an indoor heat exchanger 8 and an indoor fan 10.

Next, the basic operation of the air conditioner 100 will be described separately for heating operation and cooling operation.
In the case of heating operation, the gaseous refrigerant compressed by the compressor 4 flows to the indoor heat exchanger 8 through the four-way valve 5, and heat exchange with the indoor air is performed by the airflow generated by the indoor fan 10. It condenses from the gas state and changes to a liquid state (releases heat). The refrigerant in the liquid state flows to the outdoor heat exchanger 6 through the expansion valve 9, absorbs the heat of the outdoor air by the air flow generated by the outdoor fan 7, and performs heat exchange, so that the refrigerant is out of the liquid state. It evaporates into a gas state and flows to the compressor 4.

  In the cooling operation, switching the four-way valve 5 reverses the direction in which the refrigerant flows as compared with the heating operation. The refrigerant in the gas state compressed by the compressor 4 flows into the outdoor heat exchanger 6 through the four-way valve 5, releases the heat to the outdoor air by the air flow generated by the outdoor fan 7, and performs heat exchange. It condenses and changes to a liquid state. The refrigerant in the liquid state flows to the indoor heat exchanger 8 through the expansion valve 9, absorbs heat from the indoor air with the air flow generated by the indoor fan 10, and evaporates to become a gas state and enters the compressor 4. Flowing.

  In addition, the air conditioner 100 including the outdoor unit 1 of the present embodiment is equipped with both the heating operation mode and the cooling operation mode, the one equipped only with the cooling operation mode, the heating operation mode and the cooling operation mode. In addition to the above, a dehumidifying operation mode may be installed.

FIG. 2 is an exploded perspective view showing the outdoor unit of the air conditioner according to the present embodiment.
As shown in FIG. 2, the housing 13 of the outdoor unit 1 includes a base 13a, a front plate 13b, a top plate 13c, a left side plate 13d, and a right side plate 13e. The casing 13 is, for example, a coated steel plate.

  Inside the outdoor unit 1, an outdoor heat exchanger 6 and a partition plate 12 that divides the inside of the outdoor unit 1 into a blower chamber and a machine chamber are provided. An electric box 11 is installed inside the outdoor unit 1 above the partition plate 12. The electric box 11 is supported by a partition plate 12. An outdoor heat exchanger 6, an outdoor fan 7, a motor support member (not shown), and the like are disposed in the air blowing chamber. A compressor 4, a four-way valve (not shown), an expansion valve (not shown), and the like are arranged in the machine room.

  The outdoor air is sucked in from the back side and the left side of the outdoor unit 1 by the outdoor fan 7, passes through the outdoor heat exchanger 6, and then blows out from the front plate 13 b of the outdoor unit 1. The outdoor heat exchanger 6 is disposed along the back surface of the outdoor unit 1 from the left side plate 13d so as to cover the inside of the left side plate 13d and the back side of the outdoor unit 1.

FIG. 3 is a schematic diagram showing an outdoor heat exchanger used in an outdoor unit of an air conditioner.
As shown in FIG. 3, the outdoor heat exchanger 6 (heat exchanger) includes a fin laminate 21 </ b> A, a heat transfer tube group 22 </ b> A, and header tubes 23 and 23.

  The fin laminate 21 </ b> A is configured by laminating a plurality of fins 21 made of aluminum (made of an aluminum alloy) at intervals in the thickness direction. Each fin 21 has a rectangular shape elongated in the vertical direction (strip shape), and both upper and lower ends face the vertical direction. Moreover, the surface of each fin 21 is subjected to zinc spraying. Zinc spraying is a technique in which zinc is melted with heat and sprayed.

  The heat transfer tube group 22A is configured by penetrating a plurality of heat transfer tubes 22 formed of flat tubes made of aluminum (made of aluminum alloy) through the fin laminate 21A (a plurality of fins 21).

  The cross section of each heat transfer tube 22 has the same shape from one end to the other end of the heat transfer tube 22. The surface of each heat transfer tube 22 is subjected to zinc spraying.

  The heat transfer tubes 22 are arranged such that the axial direction of the heat transfer tubes 22 (the flow direction of the refrigerant) faces the left and right horizontal directions, and are arranged at intervals in the vertical direction. Further, the left and right ends of each heat transfer tube 22 protrude laterally from both ends of the fin laminate 21A.

  In addition, the heat exchanger tube 22 is arrange | positioned so that a longitudinal direction (long-axis direction) may face a front side (front-back direction). Thereby, the air resistance when taking outdoor air into the inside can be reduced, and heat exchange can be performed with a smaller air volume. The direction of the heat transfer tube 22 may be arranged, for example, so as to be horizontal at the center in the vertical direction of the outdoor heat exchanger 6 and inclined so that the front side is upward on the upper side and the lower side.

  As a method of fixing the heat transfer tube 22 to the fin 21, the heat transfer tube 22 may be inserted into a flat hole formed in the fin 21 so as to penetrate the tube, and then expanded and fixed by air pressure. Alternatively, a concave notch may be formed on the side surface (rear side) of the fin 21, and the heat transfer tube 22 may be inserted into the notch and fixed by brazing.

  Thus, by using the flat heat transfer tube 22 made of aluminum (made of aluminum alloy), it is possible to improve the performance of the outdoor heat exchanger 6, reduce the amount of expensive copper used, and reduce the amount of enclosed refrigerant. it can.

  The header tubes 23 are connected to the end portions of the heat transfer tubes 22 on the outer sides of the left and right ends of the fin laminate 21A. Each header tube 23 is configured to have substantially the same height (length in the axial direction) as the fin laminate 21A.

  Similarly to the fins 21 and the heat transfer tubes 22, the header tube 23 is formed of an aluminum (aluminum alloy) material and is formed in a circular tube shape. Note that the shape of the header tube 23 is not limited to a circular tube, and may be another shape such as a square tube.

  In addition, although illustration is abbreviate | omitted, the flow of the refrigerant | coolant in the outdoor heat exchanger 6 is set suitably. For example, a partition plate may be provided inside the header pipe 23 so that the refrigerant flows in a meandering manner from the lower part to the upper part of the outdoor heat exchanger 6.

  By the way, in the heat exchanger described in Patent Document 1, as shown in the representative drawing, a recess is formed in a header collecting pipe (header pipe), and a heat transfer tube is inserted into the recess. Thereby, it is expected that the heat exchange efficiency is improved and the drainage of condensed water is improved by increasing the exposed area of the heat transfer tube. However, increasing the exposed area of the heat transfer tube increases the risk of penetration of the heat transfer tube due to corrosion (pitting corrosion).

  Also, compared to conventional copper heat transfer tubes, aluminum heat transfer tubes are said to be vulnerable to corrosion, because aluminum is a metal that causes pitting corrosion, which is corrosion in the depth direction locally. It is. In order to prevent such corrosion, corrosion prevention is often performed on aluminum by means of sacrificial protection. Sacrificial protection is a means of preventing corrosion of metals that are desired to be protected, instead of preferentially corroding metals that have a lower natural potential by electrically connecting metals that have a lower natural potential than the metal that is desired to be protected. Point to. Examples of metals that have a lower natural potential than aluminum include zinc and cadmium. However, cadmium is an element harmful to the human body, so its use is restricted, and zinc must be used for sacrificial corrosion protection of aluminum. Is almost.

  In the heat exchanger made of aluminum, in order to perform sacrificial corrosion prevention, zinc spraying on the surface of the heat transfer tube and addition of zinc to the brazing material and the aluminum fin are widely performed. However, when the exposed area of the heat transfer tube is increased as in Patent Document 1, although the zinc spraying on the heat transfer tube has a corrosion prevention effect, the corrosion prevention effect on the heat transfer tube by the brazing material or aluminum fins does not work. It is expected that the corrosion resistance will decrease and the risk of the heat transfer tube penetrating will increase. That is, since sacrificial corrosion protection can only be effective within a range of several millimeters from the contacted portion, sacrificial corrosion protection does not work in the portion where there is no fin (between the header collecting pipe and the end fin).

  Therefore, in the embodiment according to the present invention, the header pipe 23 to which the heat transfer tube 22 is connected is provided with the processing portions 24A, 24B, 24C, and 24D that reduce the exposed area, whereby the risk of penetration of the heat transfer tube 22 due to corrosion. It is intended to reduce this. Details of each embodiment will be described below.

(First embodiment)
FIG. 4: shows the outdoor heat exchanger of the air conditioner which concerns on 1st Embodiment, (a) is a longitudinal cross-sectional view, (b) is the sectional view on the AA line of (a). FIG. 4A schematically shows one fin 21 with one straight line (the same applies to the drawings of other embodiments).

  As shown in FIG. 4A, the outdoor heat exchanger 6A (heat exchanger) includes a plurality of fins 21, a plurality of heat transfer tubes 22 having a flat cross-sectional shape that penetrates the plurality of fins 21, and a plurality of heat transfer tubes. And a header pipe 23 to which both ends of the heat pipe 22 are connected. In FIG. 4A, only one heat transfer tube 22 is illustrated and described, but the other heat transfer tubes 22 are configured in the same manner.

  The header tube 23 has a processing portion 24A to which the heat transfer tube 22 is connected. The processed portion 24A is a portion where one heat transfer tube 22 is joined, and a hole portion 25 into which an end portion of the heat transfer tube 22 is inserted, and a rising portion (flange) rising from the hole portion 25 toward the outside of the header tube 23. Part) 26A.

  The hole 25 is formed larger than the outer diameter (outer shape) of the heat transfer tube 22 and has an opening area into which the heat transfer tube 22 can be inserted. The rising portion 26 </ b> A extends from the edge of the hole 25 in a direction approaching the heat transfer tube 22 and in a direction along the heat transfer tube 22. Thus, by forming the rising portion 26A, the exposed area of the heat transfer tube 22 between the header tube 23 and the end fin 21e can be reduced as compared with the case where the rising portion 26A is not formed. it can.

  As shown in FIG. 4B, the heat transfer tube 22 has an upper surface 22a and a lower surface 22b formed by flat surfaces, and end surfaces 22c and 22d formed by curved surfaces, and has a flat shape in a sectional view. It is. The heat transfer tube 22 is formed so as to penetrate in the axial direction inside, and a plurality of flow paths 22e through which the refrigerant flows are formed at intervals in the longitudinal direction. The flow path 22 e communicates with the inside of the header pipe 23. Note that the inside of the heat transfer tube 22 is not limited to a plurality of flow paths having a circular cross section, and may be divided into a plurality of flow paths by a partition plate.

  The rising portion 26A has a shape surrounding the entire periphery of the heat transfer tube 22, and is in contact with the outer peripheral surface (the upper surface 22a, the lower surface 22b, and the end surfaces 22c, 22d) of the heat transfer tube 22 at the tip 26a of the rising portion 26A. In FIG. 4A, the rising portion 26A is formed to be curved in a cross-sectional view, but is not limited to a curved surface, and may have an angular shape.

  Such a processed portion 24A can be formed by so-called burring. For example, by preparing a hole in the header pipe 23 by punching, placing a convex jig inside the header pipe 23 at the position of the lower hole, and pressing from the outside of the header pipe 23 with a press machine, A rising portion 26A is formed at the periphery of the hole.

  The heat transfer tube 22 and the rising portion 26A are fixed (joined) to each other by brazing. For example, a brazing material having a melting point lower than that of the header tube 23 is applied to the surface of the header tube 23. Then, the brazing material on the surface of the header tube 23 is melted by being put in the furnace, the melted brazing material flows out to the rising portion 26 </ b> A, and the heat transfer tube 22 is joined to the header tube 23.

  As described above, in the outdoor heat exchanger 6A according to the first embodiment, the header pipe 23 has the hole 25 into which the heat transfer pipe 22 is inserted as the processing portion 24A and the hole 25 toward the outside of the header pipe 23. And a rising portion 26A that rises. According to this, since the exposed area of the heat transfer tube 22 between the header tube 23 and the fin 21e (21) closest to the header tube 23 is reduced by the rising portion 26A, the risk of penetration of the heat transfer tube 22 due to corrosion is reduced. And the risk that the refrigerant leaks from the heat transfer tube 22 can be reduced. Thus, the corrosion resistance of the heat transfer tube 22 can be improved by reducing the exposed area of the heat transfer tube 22. Note that although the heat transfer area is reduced as the exposed area of the heat transfer tube 22 is reduced, the reduction area is very small and has little influence on the performance of the outdoor heat exchanger 6A.

  In the first embodiment, the distance L from the processed portion 24 </ b> A (the position of the hole 25, the base end of the rising portion 26 </ b> A) to the nearest fin 21 e is formed longer than the pitch P of the fins 21. According to this, when the heat transfer tube 22 is brazed to the header tube 23, it is possible to prevent the brazing material from contacting the fins 21 and melting the fins 21.

  In the first embodiment, the case where one header tube 23 and one end of the heat transfer tube 22 are joined has been described as an example, but the other header tube 23 and the other end of the heat transfer tube 22 are joined. Description of the configuration to be performed is also omitted as it is configured in the same manner as described above (the same applies to the following embodiments).

(Second Embodiment)
FIG. 5: shows the outdoor heat exchanger of the air conditioner which concerns on 2nd Embodiment, (a) is a longitudinal cross-sectional view, (b) is the BB sectional drawing of (a). In FIG. 5, the rising portion 26 </ b> B (the separation portion 26 s) is slightly exaggerated.
As shown in FIG. 5A, the outdoor heat exchanger 6 </ b> B includes a hole portion 25 into which the heat transfer tube 22 is inserted as a processing portion 24 </ b> B in the header tube 23, and the hole portion 25 toward the outside of the header tube 23. And a rising portion 26B that rises.

  The rising portion 26B has a configuration in which a separating portion 26s extending in a direction away from the heat transfer tube 22 is added to the tip of the rising portion 26A in the first embodiment. The separation portion 26 s is formed to be bent so as to be separated from the heat transfer tube 22 as it is away from the header tube 23.

  As illustrated in FIG. 5B, the separation portion 26 s is configured such that a gap S is formed around the entire flat heat transfer tube 22. The spacing portion 26s is not limited to the curved shape in the cross-sectional view of FIG. 5A, and other various types as long as the shape is spaced from the heat transfer tube 22, such as a shape extending linearly in the cross-sectional view. The shape can be adopted.

  In the outdoor heat exchanger 6B of the second embodiment, as the processing portion 24B of the header tube 23, a hole portion 25 into which the heat transfer tube 22 is inserted, and a rising portion 26B rising from the hole portion 25 toward the outside of the header tube 23, ,have. According to this, the exposed area of the heat transfer tube 22 between the header tube 23 and the fin 21e (21) closest to the header tube 23 is further reduced by the rising portion 26B (including the separation portion 26s). Thereby, the penetration risk of the heat transfer tube 22 due to corrosion can be further reduced, and the risk that the refrigerant leaks from the heat transfer tube 22 can be further reduced. Thus, the corrosion resistance of the heat transfer tube 22 can be further improved by further reducing the exposed area of the heat transfer tube 22.

  Moreover, in 2nd Embodiment, the clearance gap S (refer FIG. 5 (a), (b)) is formed between the separation part 26s and the heat exchanger tube 22 by forming the separation part 26s in the standing part 26B. Therefore, when brazing in the furnace, the brazing material is likely to enter between the heat transfer tube 22 and the separation portion 26s (the brazing material is easily collected). Thereby, since the part in which a fillet is formed increases, the reliability at the time of brazing the heat exchanger tube 22 to the header tube 23 can be improved.

  Moreover, in 2nd Embodiment, since the opening | mouth into which the heat exchanger tube 22 is inserted becomes wide by forming the separation | spacing part 26s in the standing | starting-up part 26B, when attaching the heat exchanger tube 22 to the header tube 23, the heat exchanger tube 22 is attached to a header. It becomes easy to insert into the tube 23 (it becomes easy to guide).

  In the second embodiment, the case where the spacing portion 26s is formed so as to surround the entire periphery of the heat transfer tube 22 has been described as an example, but the spacing portion 26s is cut in the axial direction (direction along the heat transfer tube 22). A notch (not shown) may be formed so that the brazing material can easily enter the gap S during brazing. Thereby, it is possible to prevent a problem that the brazing material does not partially enter the gap S.

(Third embodiment)
FIG. 6: shows the outdoor heat exchanger of the air conditioner which concerns on 3rd Embodiment, (a) is a longitudinal cross-sectional view, (b) is CC sectional view taken on the line of (a).
As shown in FIG. 6 (a), the outdoor heat exchanger 6C includes a hole 25 into which an end of the heat transfer tube 22 is inserted into the header tube 23 as a processing portion 24C, and an outside of the header tube 23 from the hole 25. And a rising portion 26C that rises toward the center. The rising portion 26C is formed only in the lower half.

  As shown in FIG. 6B, the rising portion 26 </ b> C is formed only on one side (lower surface 22 b) side formed along the longitudinal direction (long axis direction) R of the heat transfer tube 22. That is, the rising portion 26 </ b> C is formed only on the lower side in the vertical direction by the entire lower surface 22 b of the heat transfer tube 22 and the lower half of the end surfaces 22 c and 22 d of the heat transfer tube 22. The rising portion 26 </ b> C is formed in a dish shape (concave shape) when viewed from the axial direction (fin 21 side) of the heat transfer tube 22.

  In the third embodiment, by providing the rising portion 26C, the exposed area of the heat transfer tube 22 between the header tube 23 and the fin 21e (21) closest to the header tube 23 is reduced. The risk of penetration can be reduced, and the risk of refrigerant leaking from the heat transfer tube 22 can be reduced. Thus, the corrosion resistance of the heat transfer tube 22 can be improved by reducing the exposed area of the heat transfer tube 22.

  Further, in the third embodiment, by forming the rising portion 26C only on one side of the heat transfer tube 22, it becomes difficult for the brazing material to flow into the fin 21e closest to the header tube 23, and there is a risk that the brazing material contacts the fin 21e. Can be reduced.

(Fourth embodiment)
FIG. 7: shows the outdoor heat exchanger of the air conditioner which concerns on 4th Embodiment, (a) is a longitudinal cross-sectional view, (b) is the DD sectional view taken on the line of (a).
As shown in FIG. 7 (a), the outdoor heat exchanger 6D includes a hole 25 into which the end of the heat transfer tube 22 is inserted into the header tube 23 as a processing portion 24D, and the outside of the header tube 23 from the hole 25. And a rising portion 26D that rises toward the front. Contrary to the third embodiment, the rising portion 26D is formed only in the upper half.

  As illustrated in FIG. 7B, the rising portion 26 </ b> D is formed only on one surface (upper surface 22 a) side formed along the longitudinal direction (major axis direction) R of the heat transfer tube 22. That is, the rising portion 26 </ b> D is formed only on the upper side in the vertical direction by the entire upper surface 22 a of the heat transfer tube 22 and the upper half of the end surfaces 22 c and 22 d of the heat transfer tube 22. Further, the rising portion 26D is formed in an inverted dish shape (reverse concave shape, arch shape) when viewed from the axial direction (fin 21 side) of the heat transfer tube 22.

  In the fourth embodiment, by providing the rising portion 26D, the exposed area of the heat transfer tube 22 between the header tube 23 and the fin 21e (21) closest to the header tube 23 is reduced. The risk of penetration can be reduced, and the risk of refrigerant leaking from the heat transfer tube 22 can be reduced. Thus, the corrosion resistance of the heat transfer tube 22 can be improved by reducing the exposed area of the heat transfer tube 22.

  Further, in the fourth embodiment, by forming the rising portion 26D only on one side of the heat transfer tube 22, it becomes difficult for the brazing material to flow into the fin 21e closest to the header tube 23, and there is a risk that the brazing material contacts the fin 21e. Can be reduced.

  Further, in the fourth embodiment, by providing the rising portion 26D on the upper side of the heat transfer tube 22, it is possible to reduce the contact of water droplets or the like with the upper surface 22a of the heat transfer tube 22, and the heat transfer is performed as in the third embodiment. The corrosion resistance of the heat transfer tube 22 can be improved as compared with the case where it is provided below the heat tube 22.

(Fifth embodiment)
FIG. 8 is a longitudinal sectional view of an outdoor heat exchanger of the air conditioner according to the fifth embodiment.
As shown in FIG. 8, in the outdoor heat exchanger 6A of the first embodiment, the outdoor heat exchanger 6E has the thickness of the fin 21e (21) closest to the header pipe 23 as T1, and the thickness of the other fins 21. When T2, T1> T2. The thickness T1 of the fin 21e is preferably set to a thickness that does not melt even if the brazing material contacts during brazing.

  In the fifth embodiment, since the thickness T1 of the fin 21e closest to the header pipe 23 is thicker than the thickness T2 of the other fins 21, the brazing material comes into contact with the fins 21e at the time of brazing and the fins 21e are melted. Can be prevented.

  In the fifth embodiment, the case where the present invention is applied to the outdoor heat exchanger 6A of the first embodiment has been described as an example. However, the present invention is not limited to this, and the fifth embodiment is not limited to the second to fourth embodiments. It may be applied to any of the embodiments.

(Sixth embodiment)
FIG. 9 is a longitudinal sectional view of an outdoor heat exchanger of the air conditioner according to the sixth embodiment.
As shown in FIG. 9, the outdoor heat exchanger 6F includes a fin 21e (21) closest to the header pipe 23, an insertion hole 21e1 through which the heat transfer pipe 22 is inserted, and the insertion hole 21e1 toward the header pipe 23. The rising fin rising portion 21e2 is formed.

  The fin rising portion 21e2 is formed in a flat tubular shape so as to surround the entire periphery of the heat transfer tube 22. The fin rising portion 21e2 can be formed by burring, for example, similarly to the rising portion 26A of the first embodiment.

  The rising height H of the fin rising portion 21e2 is preferably set to a length that does not contact the brazing material when the heat transfer tube 22 and the processed portion 24A of the header tube 23 are brazed. However, in the case of the outdoor heat exchanger 6F shown in FIG. 9, the thickness T1 of the fin 21e is formed thicker than the thickness T2 of the other fins 21 for the purpose of preventing melting of the fin 21e due to contact with the brazing material. Alternatively, the height H may be set to such a length that the brazing material contacts.

  In the sixth embodiment, by forming the fin rising portion 21e2 toward the header tube 23 on the fin 21e closest to the header tube 23, the fin rising portion 21e2 closes the header tube 23 and the fin 21e (21 ), The exposed area of the heat transfer tube 22 is further reduced, so that the risk of penetration of the heat transfer tube 22 due to corrosion can be further reduced, and the risk of refrigerant leaking from the heat transfer tube 22 can be further reduced. Thus, the corrosion resistance of the heat transfer tube 22 can be further improved by further reducing the exposed area of the heat transfer tube 22.

  In the sixth embodiment, the case of applying to the outdoor heat exchanger 6A of the first embodiment has been described as an example, but the sixth embodiment is applied to any of the second to fourth embodiments. May be.

  In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the first to sixth embodiments may be appropriately combined.

1 Outdoor unit (air conditioner outdoor unit)
2 Indoor unit 6, 6A, 6B, 6C, 6D, 6E, 6F Outdoor heat exchanger (heat exchanger)
21 Fin 21A Fin laminate (multiple fins)
21e Fin closest to the header tube 21e1 Insertion hole 21e2 Fin rising portion 22 Heat transfer tube 22a Upper surface 22b Lower surface 22c, 22d End surface 22e Flow path 22A Heat transfer tube group (multiple heat transfer tubes)
23 Header pipe 24A, 24B, 24C, 24D Processing part 25 Hole part 26A, 26B, 26C, 26D Standing part 100 Air conditioner

Claims (8)

A plurality of fins, a plurality of heat transfer tubes having a flat cross-sectional shape passing through the plurality of fins, and a header tube to which the plurality of heat transfer tubes are connected,
The header pipe has a plurality of processed parts to which the plurality of heat transfer pipes are connected,
The processing section includes a hole portion into which the heat transfer tube is inserted, and a rising portion that rises from the hole portion toward the outside of the header tube. The heat exchanger according to claim 1,
The riser has a separating portion extending in a direction away from the heat transfer tube toward the outside of the header tube. The heat exchanger according to claim 1 or 2,
The riser is formed only on one side of a surface along the longitudinal direction of the heat transfer tube. The heat exchanger according to claim 3,
The heat exchanger according to claim 1, wherein the one side is an upper side in a vertical direction. The heat exchanger according to any one of claims 1 to 4,
The distance from the said process part to the said nearest fin is formed longer than the pitch of the said fin, The heat exchanger characterized by the above-mentioned. The heat exchanger according to any one of claims 1 to 5,
The heat exchanger according to claim 1, wherein a thickness of the fin closest to the processed portion is formed to be thicker than other fins. The heat exchanger according to any one of claims 1 to 6,
The fin closest to the processed portion has an insertion hole through which the heat transfer tube is inserted, and a fin rising portion that rises from the insertion hole toward the header tube.   An outdoor unit for an air conditioner comprising the heat exchanger according to any one of claims 1 to 7.