WO2015037234A1

WO2015037234A1 - Heat exchanger manufacturing method and heat exchanger

Info

Publication number: WO2015037234A1
Application number: PCT/JP2014/004667
Authority: WO
Inventors: 正憲神藤; 好男織谷; 康介森本; 智彦坂巻; 拓也上総; 潤一濱舘
Original assignee: ダイキン工業株式会社
Priority date: 2013-09-11
Filing date: 2014-09-10
Publication date: 2015-03-19
Also published as: CN105518404A; JP5900440B2; JP2015055401A; CN105518404B

Abstract

Fins (32, 62) having a protrusion (188) on one edge are mounted on one end and the other end of each of multiple flat tubes (170) that comprise a flat tube section (31) of an upwind tube column (50) and a flat tube section (61) of a downwind tube column (90) such that the protrusions (188) face in opposite directions, and each flat tube (170) is bent between the one end and the other end. Hereby, the upwind tube column (50) and the downwind tube column (90) are formed in a state in which the protrusions (188) of the fins (32, 62) face the same direction, ensuring the water drainage properties of the two-column heat exchanger and preventing errors in assembly.

Description

Manufacturing method of heat exchanger and heat exchanger

The present invention relates to a heat exchanger manufacturing method and a heat exchanger that have flat tubes and fins to exchange heat between refrigerant and air.

Conventionally, heat exchangers that have flat tubes and fins to exchange heat between refrigerant and air are known. Patent Document 1 (see FIG. 3) discloses a heat exchanger having a single-row structure having one tube row composed of arranged flat tubes. Patent Document 2 (see FIG. 2) and Patent Document 3 (see FIG. 22) disclose a heat exchanger having a two-row structure having two tube rows made of arranged flat tubes. In the heat exchanger disclosed in Patent Literature 2, two tube rows are configured by arranging individual flat tubes in two rows. On the other hand, in the heat exchanger of Patent Document 3, two tube rows are formed by arranging U-shaped flat tubes bent at an intermediate portion. In the heat exchangers disclosed in Patent Documents 1 to 3, a header is connected to the end of the flat tube, and the refrigerant flowing into the header flows into a plurality of flat tubes.

JP 2013-137193 A Japanese translation of publication 2005-510689 Japanese Patent Laid-Open No. 08-145580

By the way, in the heat exchanger of patent document 1, many notch parts are formed in the one edge part of the fin at fixed intervals, and a flat tube is formed toward the other edge part from the notch part of a fin. It is inserted and fixed in the pipe insertion part (slit) currently made. Since the fins do not have good drainage on the tube insertion part side, there is a problem that frosting tends to proceed depending on the arrangement of the fins when the heat exchanger having a two-row structure is an evaporator.

Also, in a heat exchanger with a two-row structure, if the flat tubes of each tube row are connected by a connecting member, the direction of the fins may be mistakenly assembled.

The present invention has been made in view of such problems, and its purpose is to ensure drainage of a heat exchanger having a two-row structure composed of a plurality of flat tubes and a plurality of fins having cutout portions. And providing a heat exchanger manufacturing method and a heat exchanger capable of preventing erroneous assembly.

The first aspect of the present disclosure includes an upwind tube row (50) and a leeward tube row (90), each of which is configured by a plurality of flat tube portions (31, 61) arranged in parallel and arranged in the air flow direction. The manufacturing method of the heat exchanger provided with the fins (32, 62) joined to the flat tube portions (31, 61) is premised.

The heat exchanger manufacturing method includes a plurality of notches (186) formed at one edge at regular intervals, and formed from the notches (186) toward the other edge. The fin (32, 62) having the tube insertion portion (187) into which the flat tube portion (31, 61) is inserted is connected to the flat tube portion (31) of the upwind tube row (50) and the leeward tube row (90 And a fin mounting step of mounting the ends of the plurality of flat tubes (170) having the flat tube portions (61) in the opposite directions to the one end and the other end of the flat tubes (170), By bending each flat tube (170) between one end and the other end, the upwind tube row (in the state where the edges on the tube insertion portion (187) side of the fins (32, 62) face in the same direction ( 50) and a tube row forming step for forming the leeward tube row (90).

In this first aspect, the fins (32, 62) are connected to a plurality of flat tubes having a flat tube portion (31) of the windward tube row (50) and a flat tube portion (61) of the leeward tube row (90) ( 170) Fin mounting step for mounting the ends of the tube insertion portion (187) on the one end and the other end in opposite directions, and each flat tube (170) between the one end and the other end. The tube row forming step of forming the windward tube row (50) and the leeward tube row (90) with the edges of the fins (32, 62) on the tube insertion portion (187) side facing in the same direction As a result, a two-row heat exchanger can be manufactured.

According to a second aspect of the present disclosure, in the first aspect, the fin (32, 62) is formed between the adjacent notch portions (186) on the one edge portion, and the flat tube portion ( 31, 61) and a fin (32) projecting from the fin (32) on the windward tube row (50) side and the leeward tube row ( Each flat tube (170) is bent between one end and the other end so that the protrusion (188) of the fin (62) on the 90) side faces the same direction.

In this second aspect, the tube row forming step for forming the windward tube row (50) and the leeward tube row (90) in a state where the protrusions (188) of the fins (32, 62) face in the same direction. By doing so, a heat exchanger having a two-row structure can be manufactured.

According to a third aspect of the present disclosure, in the first or second aspect, the fin (32) and the leeward tube row (90) on the upwind tube row (50) side aligned in the air flow direction after the tube row forming step. A gap is formed between the fin (62) on the side.

According to a fourth aspect of the present disclosure, in any one of the first to third aspects, in the fin mounting step, a plurality of fins (32, 32) are provided at one end and the other end of the flat tube portion (31). 62) is formed to form the fin group (33) of the leeward tube row (50) and the fin group (63) of the leeward tube row, while the fin (32 , 62) is formed in the gap portion (140).

In this 4th aspect, each flat tube (170) is bent in the gap part (140) formed between both fin groups (33,63), and an upwind tube row (50) and a leeward tube row (90 ) Is formed.

According to a fifth aspect of the present disclosure, in any one of the first to fourth aspects, the tube row forming step is configured such that the flat tube (170) is U-shaped between the one end and the other end. A step of bending the U-shaped bent portion (173) into a three-dimensional bent portion (173) deviating from the flat surface of the flat tube (170).

According to a sixth aspect of the present disclosure, in any one of the first to fourth aspects, the tube row forming step is configured such that the flat tube (170) is U-shaped between the one end and the other end. A step of bending the U-shaped bent portion (173) into a planar bent portion (173) along the plane of the flat tube (170).

In the fifth and sixth aspects, the upwind tube row (50) and the leeward tube row are formed by bending the flat tube (170) in a U shape between the one end and the other end in the tube row forming step. (90) is formed.

According to a seventh aspect of the present disclosure, in any one of the first to sixth aspects, the tube row forming step is configured to replace the flat tube (170) with the flat tube portion of the upwind tube row (50) ( 31) and a step of bending so that the positions of the flat tube portions (61) of the leeward tube row (90) are shifted in the arrangement direction of the flat tube portions (31, 61).

In this seventh aspect, the flat tube portion (31) of the windward tube row (50) of the formed heat exchanger and the flat tube portion (61) of the leeward tube row (90) are arranged in the direction of arrangement (flat tube portion). (Direction perpendicular to the flat plane of (31, 61)), the flat pipe section (31) between the flat pipe section (31) and the flat pipe section (31) of the windward tube row (50) should be brought into contact with the flat pipe section (31). The air that has passed without passing through is in contact with the flat tube portion (61) of the leeward tube row (90).

The eighth aspect of the present disclosure includes an upwind tube row (50) and a leeward tube row (90), each of which is configured by a plurality of flat tube portions (31, 61) arranged in parallel and arranged in the air flow direction. A heat exchanger provided with fins (32, 62) joined to the flat tube portions (31, 61) is assumed.

The heat exchanger includes a plurality of notches (186) in which the fins (32, 62) are formed at a certain interval on one edge, and the other edge from the notches (186). Tube insertion portion (187) into which the flat tube portion (31, 61) is inserted and the fin (32) on the upwind tube row (50) side. Each of the flat tubes in the upwind tube row (50) is arranged so that the edge on the side and the edge on the tube insertion portion (187) side of the fin (62) on the leeward tube row (90) side face in the same direction. Each of the flat tube portions (61) of the head portion (31) and the leeward tube row (90) is formed by bending one flat tube (170) between the two tube rows. A bent portion (173) is formed between the flat tube portion (31) and the flat tube portion (61) of the leeward tube row (90).

According to a ninth aspect of the present disclosure, in the eighth aspect, the fin (32, 62) is formed between the adjacent notch portions (186) on the one edge portion, and the flat tube portion ( 31 (61) and a projection (188) projecting from the fin (32) on the upwind tube row (50) side and the fin (62) on the leeward tube row (90) side. The protrusion (188) faces the same direction.

According to the first and second aspects of the present disclosure, in the heat exchanger having a two-row structure, the protrusions (188) of the flat tubes (31, 61) or the fins (32, 62) are oriented in the same direction. Can be easily formed, and erroneous assembly can be prevented. When the fins (32, 62) are arranged so that the pipe insertion part (187) side or the protrusions (188) face the windward side, the fin insertion part (187) side is located on the leeward side of each fin (32, 62). Or, since the protrusion (188) does not exist, water droplets condensed on the flat tube portion (31, 61) pass through the edge on the downstream side in the air flow direction of the fins (32, 62) of each row. It begins to flow down the exchanger. Therefore, when this heat exchanger is used as an evaporator, frost formation can be prevented from proceeding.

According to the third aspect of the present disclosure, the fin (32) on the upwind tube row (50) side and the fin (62) on the leeward tube row (90) side arranged in the air flow direction after the tube row forming step. A gap is formed between the fins (62) on the leeward tube row (90) when water drops condensed on the fins (32) on the upwind tube row (50) flow through the downstream side portion. It will flow smoothly without stopping by the protrusion (188). Therefore, when this heat exchanger is used as an evaporator, it is possible to reliably prevent frost formation from proceeding.

According to the fourth aspect of the present disclosure, the upwind tube row (50) and the downwind tube are formed by bending each flat tube (170) in the gap portion (140) formed between the fin groups (33, 63). By forming the row (90), a two-row heat exchanger can be easily manufactured.

According to the fifth and sixth aspects of the present disclosure, the windward tube row (50) and the leeward tube row (90) are formed by bending the flat tube (170) into a U shape in the tube row forming step. Therefore, a heat exchanger having a two-row structure can be easily manufactured.

According to the seventh aspect of the present disclosure, the flat tube portion (31) of the windward tube row (50) of the heat exchanger to be formed and the flat tube portion (61) of the leeward tube row (90) are arranged in the direction of arrangement. The air that has passed between the flat tube portion (31) and the flat tube portion (31) of the upwind tube row (50) without coming into contact with the flat tube portion (31) is shifted to the leeward tube row (90). Since it passes in the state which contacts the flat pipe part (61), the air volume which does not contact with the flat pipe part (31, 61) decreases, and heat exchange efficiency can be improved.

And the heat exchanger of the said 8th, 9th aspect can be easily manufactured by implementing the manufacturing method of the 1st-7th aspect of this indication.

Drawing 1 is a refrigerant circuit figure showing the schematic structure of the air harmony machine provided with the outdoor heat exchanger of an embodiment. Drawing 2 is a perspective view which looked at an outdoor heat exchanger of an embodiment from the 1st direction. Drawing 3 is a perspective view which looked at an outdoor heat exchanger of an embodiment from the 2nd direction. 4A is a partial cross-sectional view of the outdoor heat exchanger according to the embodiment as viewed from above, and FIG. 4B is a partial enlarged view of the IVB-IVB cross-section of FIG. It is an expanded sectional view which shows arrangement | positioning of the fin of an outdoor heat exchanger. FIG. 5 is a schematic perspective view showing the outdoor heat exchanger according to the embodiment disassembled into an upwind heat exchanger unit and a downwind heat exchanger unit, and a refrigerant when the outdoor heat exchanger functions as an evaporator. It shows the flow. FIG. 6 is a schematic perspective view showing the outdoor heat exchanger according to the embodiment disassembled into an upwind heat exchanger unit and a downwind heat exchanger unit, and the refrigerant when the outdoor heat exchanger functions as a condenser. It shows the flow. FIG. 7 is a partial cross-sectional view of the wind heat exchanger unit of the embodiment as viewed from the front. FIG. 8 is a partial cross-sectional view of the leeward heat exchanger unit of the embodiment as viewed from the front. FIG. 9 is a cross-sectional view of the heat exchanger unit showing a part of the AA cross section of FIG. 7 and the BB cross section of FIG. 8 in an enlarged manner. FIG. 10 is an enlarged cross-sectional view of a part of the upwind heat exchanger unit of the embodiment as viewed from the front. FIG. 11A is a schematic view showing a manufacturing process of an outdoor heat exchanger having a two-row structure, FIG. 11B is a cross-sectional view taken along the line XIB-XIB in FIG. 11A, and FIG. It is a XIC-XIC sectional view of A). FIG. 12A is a front view of the bent pipe portion of the embodiment, and FIG. 12B is a side view thereof. FIG. 13A is a front view of a curved pipe portion according to a modification, and FIG. 13B is a side view thereof. FIG. 14 (A) is a front view of a curved pipe part according to another modification, and FIG. 14 (B) is a side view thereof. FIG. 15 is an enlarged cross-sectional view showing a modified example of the arrangement of the flat tube portion and the fins of the two-row outdoor heat exchanger.

Embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments and modifications described below are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

The heat exchanger of this embodiment is an outdoor heat exchanger (23) provided in the air conditioner (10). Below, an air conditioner (10) is demonstrated first, and the outdoor heat exchanger (23) is demonstrated in detail after that.

-Air conditioner-
The air conditioner (10) will be described with reference to FIG.

<Configuration of air conditioner>
The air conditioner (10) includes an outdoor unit (11) and an indoor unit (12). The outdoor unit (11) and the indoor unit (12) are connected to each other via a liquid side connecting pipe (13) and a gas side connecting pipe (14). In the air conditioner (10), a refrigerant circuit (20) is formed by the outdoor unit (11), the indoor unit (12), the liquid side communication pipe (13), and the gas side communication pipe (14).

The refrigerant circuit (20) is provided with a compressor (21), a four-way switching valve (22), an outdoor heat exchanger (23), an expansion valve (24), and an indoor heat exchanger (25). ing. The compressor (21), the four-way switching valve (22), the outdoor heat exchanger (23), and the expansion valve (24) are accommodated in the outdoor unit (11). The outdoor unit (11) is provided with an outdoor fan (15) for supplying outdoor air to the outdoor heat exchanger (23). On the other hand, the indoor heat exchanger (25) is accommodated in the indoor unit (12). The indoor unit (12) is provided with an indoor fan (16) for supplying room air to the indoor heat exchanger (25).

The refrigerant circuit (20) is a closed circuit filled with refrigerant. In the refrigerant circuit (20), the compressor (21) has a discharge pipe connected to the first port of the four-way switching valve (22) and a suction pipe connected to the second port of the four-way switching valve (22). Has been. In the refrigerant circuit (20), the outdoor heat exchanger (23), the expansion valve (24), and the indoor heat exchanger are sequentially arranged from the third port to the fourth port of the four-way switching valve (22). (25) and are arranged. In this refrigerant circuit (20), the outdoor heat exchanger (23) is connected to the expansion valve (24) via the pipe (17), and the third of the four-way switching valve (22) via the pipe (18). Connected to the port.

Compressor (21) is a scroll type or rotary type hermetic compressor. The four-way switching valve (22) includes a first state (state indicated by a solid line in FIG. 1) in which the first port communicates with the third port and the second port communicates with the fourth port; The port is switched to a second state (state indicated by a broken line in FIG. 1) in which the port communicates with the fourth port and the second port communicates with the third port. The expansion valve (24) is a so-called electronic expansion valve.

The outdoor heat exchanger (23) exchanges heat between the outdoor air and the refrigerant. The outdoor heat exchanger (23) will be described later. On the other hand, the indoor heat exchanger (25) exchanges heat between the indoor air and the refrigerant. The indoor heat exchanger (25) is constituted by a so-called cross fin type fin-and-tube heat exchanger provided with a heat transfer tube which is a circular tube.

<Operation of air conditioner>
The air conditioner (10) selectively performs a cooling operation and a heating operation.

In the refrigerant circuit (20) during the cooling operation, the refrigeration cycle is performed with the four-way switching valve (22) set to the first state. In this state, the refrigerant circulates in the order of the outdoor heat exchanger (23), the expansion valve (24), and the indoor heat exchanger (25), and the outdoor heat exchanger (23) functions as a condenser. (25) functions as an evaporator. In the outdoor heat exchanger (23), the gas refrigerant flowing from the compressor (21) dissipates heat to the outdoor air and condenses, and the condensed refrigerant flows out toward the expansion valve (24).

In the refrigerant circuit (20) during the heating operation, the refrigeration cycle is performed with the four-way switching valve (22) set to the second state. In this state, the refrigerant circulates in the order of the indoor heat exchanger (25), the expansion valve (24), and the outdoor heat exchanger (23), and the indoor heat exchanger (25) functions as a condenser. (23) functions as an evaporator. The refrigerant that has expanded into the gas-liquid two-phase state flows into the outdoor heat exchanger (23) when passing through the expansion valve (24). The refrigerant that has flowed into the outdoor heat exchanger (23) absorbs heat from the outdoor air and evaporates, and then flows out toward the compressor (21).

-Outdoor heat exchanger-
The outdoor heat exchanger (23) will be described with reference to FIGS. 2 to 10 as appropriate. Note that the number of flat tubes (31, 61) shown in the following description is merely an example.

As shown in FIGS. 2 to 4, the outdoor heat exchanger (23) is a two-row air heat exchanger, and includes an upwind heat exchanger unit (30) and a downwind heat exchanger unit (60). ing. The windward heat exchanger unit (30) and the leeward heat exchanger unit (60) overlap in the direction of the air flow passing through the outdoor heat exchanger (23). In the flow direction of the air passing through the outdoor heat exchanger (23), the upwind heat exchanger unit (30) is disposed on the upstream side of the downwind heat exchanger unit (60).

As shown in FIGS. 2 to 7, the windward heat exchanger unit (30) includes one windward header collecting pipe (40), a number of flat pipe parts (31), and a number of fins (32). It has. The windward header collecting pipe (40), the flat pipe part (31), and the fin (32) are all made of an aluminum alloy and are joined to each other by brazing. The flat tube portion (31) provided in the upwind heat exchanger unit (30) constitutes the upwind tube row (50).

As shown in FIG. 2 to FIG. 6 and FIG. 8, the leeward heat exchanger unit (60) includes one leeward header collecting pipe (70), a number of flat pipe portions (61), and a number of fins (62). And. The lee header collecting pipe (70), the flat pipe part (61) and the fin (62) are all made of an aluminum alloy and are joined to each other by brazing. The flat tube portion (61) provided in the leeward heat exchanger unit (60) constitutes the leeward tube row (90).

In addition, although mentioned later in detail, the fin (32) of an upwind heat exchanger unit (30) and the fin (62) of an upwind heat exchanger unit (60) are the fins (32, 62) shown in FIG. The protrusions (188) are arranged so as to face in the same direction (upstream side of the air flow) (see FIG. 4B).

As shown in FIGS. 3 and 4, the flat tube portion (31) constituting the upwind tube row (50) and the flat tube portion (61) constituting the leeward tube row (90) are integrated. Specifically, in the outdoor heat exchanger (23) of the present embodiment, a large number of integrated flat tubes (170) bent in a U shape are arranged vertically. Each flat tube (170) is a straight flat tube bent into a U shape, and includes the two flat tube portions (31, 61) described above and the two flat tube portions (31, 61). And one bent pipe portion (bending portion) (173). In each flat tube (170), the two flat tube portions (31, 61) are substantially parallel to each other. Further, as shown in FIGS. 3, 4, and 12, the bent pipe portion (173) has a three-dimensional U-shape in which the direction of the flat portion of the flat pipe (170) changes during bending. That is, the U-shaped curved pipe portion (173) is a three-dimensional curved pipe portion (173) that is out of the plane of the flat tube (170).

In the outdoor heat exchanger (23) of the present embodiment, the flat tubes (170) adjacent to each other in the upper and lower sides have flat portions of the side surfaces of the respective flat tube portions (31, 61) facing each other, and the respective flat tube portions. The axial directions of (31, 61) are substantially parallel to each other. Each flat tube (170) has an open end of the first flat tube portion (31) connected to the windward header collecting tube (40), and an open end of the second flat tube portion (61) is the leeward header. Connect to the collecting pipe (70).

Thus, in each flat tube (170) provided in the outdoor heat exchanger (23) of the present embodiment, two flat tube portions (50) and leeward tube row (90) constituting the upwind tube row (90) ( 31, 61) are connected via one curved pipe part (173). Therefore, in the outdoor heat exchanger (23) of the present embodiment, the flat tube portion (31) constituting the upwind tube row (50) and the flat tube portion (61) constituting the leeward tube row (90) The books are connected to each other.

<Configuration of upwind heat exchanger unit>
As will be described in detail later, the upwind heat exchanger unit (30) is divided into two regions in the vertical direction as shown in FIGS. In the upwind heat exchanger unit (30), the upper area is the upwind main heat exchange area (35), and the lower area is the upwind auxiliary heat exchange area (37).

The windward header collecting pipe (40) is formed in an elongated cylindrical shape with both ends closed. In FIG. 7, the upwind header collecting pipe (40) is installed in a standing state at the left end of the upwind heat exchanger unit (30). That is, the windward header collecting pipe (40) is installed in a state where the axial direction is the vertical direction.

As shown in FIG. 9, the flat tube portion (31) is a heat transfer tube whose cross-sectional shape is a flat oval. As shown in FIG. 7, in the upwind heat exchanger unit (30), the plurality of flat tube portions (31) are in a state in which the respective axial directions are in the left-right direction and the flat portions of the respective side surfaces face each other. Is arranged. In addition, the plurality of flat tube portions (31) are arranged side by side at regular intervals and their axial directions are substantially parallel to each other. Each flat tube portion (31) has one end (the left end in FIG. 7) inserted into the windward header collecting tube (40).

As shown in FIG. 9, a plurality of fluid passages (175) are formed in each flat tube portion (31). Each fluid passage (175) is a passage extending in the axial direction of the flat tube portion (31), and is arranged in a line in the width direction of the flat tube portion (31). Each fluid passage (175) opens to the end face of the flat tube portion (31). The refrigerant supplied to the upwind heat exchanger unit (30) exchanges heat with air while flowing through the fluid passage (175) of the flat tube portion (31).

As shown in FIG. 9, the fin (32) is a vertically long plate-like fin formed by pressing a metal plate. The fin (32) is formed with a number of elongated notches (186) extending from the front edge of the fin (32) (that is, the windward edge) in the width direction of the fin (32). In the fin (32), a large number of notches (186) are formed at regular intervals in the longitudinal direction (vertical direction in the figure) of the fin (32). The portion closer to the lee of the notch (186) constitutes the tube insertion portion (187). The flat tube portion (31) is inserted into the tube insertion portion (187) of the fin (32) and joined to the peripheral portion of the tube insertion portion (187) by brazing. In addition, a louver (185) for promoting heat transfer is formed on the fin (32). The plurality of fins (32) are arranged at regular intervals in the axial direction of the flat tube portion (31).

In this way, the fin (32) is formed with a plurality of notches (186) formed at one edge at regular intervals, and from the notches (186) toward the other edge. A tube insertion portion (187) into which the flat tube portion (31) is inserted, and a protruding portion (188) protruding from the flat tube portion (31) between the adjacent cutout portions (186). Have. And the fin group (33) of an upwind tube row (50) is comprised by the several fin (32) with which the flat tube part (31) of the upwind tube row (50) was mounted | worn (FIG. 11 ( A)).

As shown in FIGS. 5 and 7, the upwind heat exchanger unit (30) is divided into two heat exchange regions (35, 37) in the vertical direction. In the upwind heat exchanger unit (30), the upper heat exchange area is the upwind main heat exchange area (35), and the lower heat exchange area is the upwind auxiliary heat exchange area (37).

The flat tube part (31) provided in the windward heat exchanger unit (30) is located in the windward main heat exchange area (35) and constitutes the windward main row part (51). What is located in a heat exchange area | region (37) comprises an upwind auxiliary row | line | column part (54). That is, a part of the flat tube portion (31) constituting the windward tube row (50) constitutes the windward auxiliary row portion (54), and the rest constitutes the windward main row portion (51). As will be described in detail later, the number of flat tube portions (31) constituting the windward auxiliary row portion (54) is smaller than the number of flat tube portions (31) constituting the windward main row portion (51).

The upwind main heat exchange area (35) is divided into six upwind main heat exchange sections (36a to 36f). On the other hand, the upwind auxiliary heat exchange region (37) is divided into three upwind auxiliary heat exchange sections (38a to 38c). Note that the numbers of the upwind main heat exchange units (36a to 36f) and the upwind auxiliary heat exchange units (38a to 38c) shown here are merely examples.

In the upwind main heat exchange area (35), the first upwind main heat exchange section (36a), the second upwind main heat exchange section (36b), and the third upwind A main heat exchange section (36c), a fourth upwind main heat exchange section (36d), a fifth upwind main heat exchange section (36e), and a sixth upwind main heat exchange section (36f) are formed. ing. Each of the upwind main heat exchange sections (36a to 36f) is provided with twelve flat tube sections (31).

The twelve flat tube portions (31) provided in the first upwind main heat exchange section (36a) constitute the first upwind main row block (52a). The twelve flat tube portions (31) provided in the second upwind main heat exchange section (36b) constitute the second upwind main row block (52b). The twelve flat tube portions (31) provided in the third upwind main heat exchange section (36c) constitute the third upwind main row block (52c). The twelve flat tube portions (31) provided in the fourth upwind main heat exchange section (36d) constitute the fourth upwind main row block (52d). The twelve flat tube portions (31) provided in the fifth upwind main heat exchange section (36e) constitute a fifth upwind main row block (52e). The twelve flat tube portions (31) provided in the sixth upwind main heat exchange section (36f) constitute a sixth upwind main row block (52f). Note that the number of the flat tube portions (31) constituting each of the upwind main row blocks (52a to 52f) does not have to coincide with each other.

The first upwind main row block (52a) and the second upwind main row block (52b) constitute a first upwind main row block group (53a). The third upwind main row block (52c) and the fourth upwind main row block (52d) constitute a second upwind main row block group (53b). The fifth upwind main row block (52e) and the sixth upwind main row block (52f) constitute a third upwind main row block group (53c).

In the upwind auxiliary heat exchange region (37), the first upwind auxiliary heat exchange section (38a), the second upwind auxiliary heat exchange section (38b), and the third upwind An auxiliary heat exchange part (38c) is formed. Each of the upwind auxiliary heat exchange sections (38a to 38c) is provided with three flat tube sections (31).

The three flat tube portions (31) provided in the first upwind auxiliary heat exchange section (38a) constitute the first upwind auxiliary row block (55a). The three flat tube portions (31) provided in the second upwind auxiliary heat exchange unit (38b) constitute a second upwind auxiliary row block (55b). The three flat tube portions (31) provided in the third upwind auxiliary heat exchange section (38c) constitute the third upwind auxiliary row block (55c). Note that the number of the flat tube portions (31) constituting each of the upwind auxiliary row blocks (55a to 55c) may not coincide with each other.

As shown in FIG. 7, the internal space of the upwind header collecting pipe (40) is vertically divided by a partition plate (41). In the upwind header collecting pipe (40), the space above the partition plate (41) is the upper space (42), and the space below the partition plate (41) is the lower space (43).

The upper space (42) communicates with all the flat tube portions (31) constituting the upwind main row portion (51). A gas side connecting pipe (102) is connected to a part of the upwind header collecting pipe (40) forming the upper space (42). A pipe (18) constituting the refrigerant circuit (20) is connected to the gas side connection pipe (102).

The liquid side connection pipe (101) is connected to the part forming the lower space (43) in the upwind header collecting pipe (40). A pipe (17) constituting the refrigerant circuit (20) is connected to the liquid side connection pipe (101). As will be described in detail later, the portion forming the lower space (43) in the windward header collecting pipe (40) is a shunt for distributing the refrigerant to the three windward auxiliary heat exchange sections (38a to 38c). (150) is configured.

<Configuration of leeward heat exchanger unit>
As will be described in detail later, the leeward heat exchanger unit (60) is divided into two heat exchange regions (65, 67) vertically as shown in FIGS. In the leeward heat exchanger unit (60), the upper area is the leeward main heat exchange area (65), and the lower area is the leeward auxiliary heat exchange area (67).

The leeward header collecting pipe (70) is formed in an elongated cylindrical shape with both ends closed. In FIG. 8, the leeward header collecting pipe (70) is installed upright at the left end of the leeward heat exchanger unit (60). That is, the leeward header collecting pipe (70) is installed in a state where the axial direction is the vertical direction.

As shown in FIG. 9, the flat tube portion (61) is a heat transfer tube having the same shape as the flat tube portion (31) of the upwind heat exchanger unit (30). The refrigerant supplied to the leeward heat exchanger unit (60) exchanges heat with air while flowing through the fluid passage (175) of the flat tube portion (61).

As shown in FIG. 8, in the leeward heat exchanger unit (60), the plurality of flat tube portions (61) are arranged in the same manner as the flat tube portion (31) of the windward heat exchanger unit (30). . One end (the left end in FIG. 8) of each of the flat tube portions (61) arranged vertically is inserted into the leeward header collecting tube (70). Of course, the number of flat tube portions (61) constituting the leeward tube row (90) is equal to the number of flat tube portions (31) constituting the leeward tube row (50).

As shown in FIG. 9, the fin (62) is a vertically long plate-like fin formed by pressing a metal plate. The shape of the fin (62) is the same as the fin (32) of the upwind heat exchanger unit (30). That is, the notch part (186) is formed in the fin (62), and the flat tube part (61) is joined to the tube insertion part (187) which is a part of the notch part (186). Further, a louver (185) for promoting heat transfer is formed on the fin (62). The plurality of fins (62) are arranged at regular intervals in the axial direction of the flat tube portion (61).

In this way, the fin (62) is formed with a plurality of notches (186) formed at one edge at regular intervals and from the notches (186) toward the other edge. And a tube insertion portion (187) into which the flat tube portion (61) is inserted, and a protruding portion (188) protruding from the flat tube portion (61) between the adjacent cutout portions (186). Have. The fin group (63) of the leeward tube row (90) is configured by the plurality of fins (62) attached to the flat tube portion (61) of the leeward tube row (90) (FIG. 11A). reference).

As shown in FIGS. 5 and 8, the leeward heat exchanger unit (60) is vertically divided into two heat exchange regions (65, 67). In the leeward heat exchanger unit (60), the upper heat exchange area is the leeward main heat exchange area (65), and the lower heat exchange area is the leeward auxiliary heat exchange area (67).

In the flat tube part (61) provided in the leeward heat exchanger unit (60), the one located in the leeward main heat exchange area (65) constitutes the leeward main row part (91), and the leeward auxiliary heat exchange area ( The one located at 67) constitutes the leeward auxiliary row (94). That is, part of the flat tube portion (61) constituting the leeward tube row (90) constitutes the leeward auxiliary row portion (94), and the rest constitutes the leeward main row portion (91). As will be described in detail later, the number of flat tube portions (61) constituting the leeward auxiliary row portion (94) is smaller than the number of flat tube portions (61) constituting the leeward main row portion (91). Further, the number of flat tube portions (61) constituting the leeward main row portion (91) is equal to the number of flat tube portions (31) constituting the leeward main row portion (51), and the leeward auxiliary row portion (94 The number of flat tube portions (61) that constitutes a) is equal to the number of flat tube portions (31) that constitute the windward auxiliary row portion (54).

The leeward main heat exchange area (65) is divided into six leeward main heat exchange sections (66a to 66f). On the other hand, the leeward auxiliary heat exchange region (67) is divided into three leeward auxiliary heat exchange sections (68a to 68c) in the vertical direction. The numbers of the leeward main heat exchange units (66a to 66f) and the leeward auxiliary heat exchange units (68a to 68c) shown here are merely examples. However, the number of leeward main heat exchangers (66a to 66f) is the same as the number of leeward main heat exchangers (36a to 36f), and the leeward auxiliary heat exchanger (68a to 68c) is the same as the windward auxiliary heat exchanger (38a to 38c). ).

In the leeward main heat exchange region (65), the first leeward main heat exchange part (66a), the second leeward main heat exchange part (66b), and the third leeward main heat exchange part in order from bottom to top. (66c), a fourth leeward main heat exchange part (66d), a fifth leeward main heat exchange part (66e), and a sixth leeward main heat exchange part (66f) are formed. Each of the leeward main heat exchange sections (66a to 66f) is provided with twelve flat tube sections (61).

The twelve flat tube portions (61) provided in the first leeward main heat exchange portion (66a) constitute the first leeward main row block (92a). The twelve flat tube portions (61) provided in the second leeward main heat exchange portion (66b) constitute the second leeward main row block (92b). The twelve flat tube portions (61) provided in the third leeward main heat exchange portion (66c) constitute the third leeward main row block (92c). The twelve flat tube portions (61) provided in the fourth leeward main heat exchange portion (66d) constitute a fourth leeward main row block (92d). The twelve flat tube portions (61) provided in the fifth leeward main heat exchange portion (66e) constitute a fifth leeward main row block (92e). The twelve flat tube portions (61) provided in the sixth leeward main heat exchange portion (66f) constitute a sixth leeward main row block (92f).

It should be noted that the number of flat tube portions (61) constituting each leeward main row block (92a to 92f) does not have to coincide with each other. However, even if the number of the flat tube portions (61) constituting each leeward main row block (92a to 92f) does not match each other, the flat tube portions (61 that constitute the first leeward main row block (92a) ) Is the same number as the flat tube portion (31) constituting the first upwind main row block (52a), and the flat tube portion (61) constituting the second leeward main row block (92b) is the second upwind main row block (52a). The number of flat tube portions (31) constituting the row block (52b) is the same, and the flat tube portion (61) constituting the third leeward main row block (92c) constitutes the third upwind main row block (52c). The flat tube portion (31) is the same number as the flat tube portion (31) to be configured, and the flat tube portion (61) constituting the fourth leeward main row block (92d) is the flat tube portion (31) constituting the fourth upwind main row block (52d) The number of flat tube portions (61) constituting the fifth leeward main row block (92e) is the same as the number of flat tube portions (31) constituting the fifth leeward main row block (52e). It is desirable that the number of flat tube portions (61) constituting the sixth leeward main row block (92f) is the same as the number of flat tube portions (31) constituting the sixth leeward main row block (52f).

The first leeward main row block (92a) and the second leeward main row block (92b) constitute a first leeward main row block group (93a). The third leeward main row block (92c) and the fourth leeward main row block (92d) constitute a second leeward main row block group (93b). The fifth leeward main row block (92e) and the sixth leeward main row block (92f) constitute a third leeward main row block group (93c).

In the leeward auxiliary heat exchange region (67), in order from bottom to top, the first leeward auxiliary heat exchange unit (68a), the second leeward auxiliary heat exchange unit (68b), and the third leeward auxiliary heat exchange unit (68c) is formed. Each of the lee auxiliary heat exchangers (68a to 68c) is provided with three flat tube portions (61).

The three flat tubes (61) provided in the first lee auxiliary heat exchanger (68a) constitute a first lee auxiliary column block (95a). The three flat tube portions (61) provided in the second leeward auxiliary heat exchange portion (68b) constitute a second leeward auxiliary row block (95b). The three flat tube portions (61) provided in the third leeward auxiliary heat exchange portion (68c) constitute a third leeward auxiliary row block (95c).

It should be noted that the number of the flat tube portions (61) constituting each of the leeward auxiliary row blocks (95a to 95c) does not have to coincide with each other. However, even if the number of the flat tube portions (61) constituting each leeward auxiliary row block (95a to 95c) does not match each other, the flat tube portions (61) constituting the first leeward auxiliary row block (95a) ) Is the same number as the flat tube portion (31) constituting the first upwind auxiliary row block (55a), and the flat tube portion (61) constituting the second upwind auxiliary row block (95b) is the second upwind auxiliary row block (55a). The number of flat tube portions (31) constituting the row block (55b) is the same, and the flat tube portion (61) constituting the third leeward auxiliary row block (95c) constitutes the third upwind auxiliary row block (55c). It is desirable that the number is equal to the number of flat tube portions (31).

As shown in FIG. 8, the internal space of the leeward header collecting pipe (70) is divided into upper and lower parts by a partition plate (71). In the lee header collecting pipe (70), the space above the partition plate (71) is an upper space (72), and the space below the partition plate (71) is a lower space (73).

The upper space (72) is divided into six main communication spaces (75a to 75f) by five partition plates (74). That is, on the upper side of the partition plate (71) in the lee header collecting pipe (70), the first main communication space (75a), the second main communication space (75b), and the third A main communication space (75c), a fourth main communication space (75d), a fifth main communication space (75e), and a sixth main communication space (75f) are formed.

The twelve flat tube portions (61) constituting the first leeward main row block (92a) communicate with the first main communication space (75a). Twelve flat tube portions (61) constituting the second leeward main row block (92b) communicate with the second main communication space (75b). Twelve flat tube portions (61) constituting the third leeward main row block (92c) communicate with the third main communication space (75c). Twelve flat tube portions (61) constituting the fourth leeward main row block (92d) communicate with the fourth main communication space (75d). Twelve flat tube portions (61) constituting the fifth leeward main row block (92e) communicate with the fifth main communication space (75e). Twelve flat tube portions (61) constituting the sixth leeward main row block (92f) communicate with the sixth main communication space (75f).

The lower space (73) is divided into three auxiliary communication spaces (77a to 77c) by two partition plates (76). That is, on the lower side of the partition plate (71) in the leeward header collecting pipe (70), the first auxiliary communication space (77a), the second auxiliary communication space (77b), and the first 3 auxiliary main communication spaces (77c) are formed.

The three flat tube portions (61) constituting the first leeward auxiliary row block (95a) communicate with the first auxiliary communication space (77a). Three flat tube portions (61) constituting the second leeward auxiliary row block (95b) communicate with the second auxiliary communication space (77b). Three flat pipe portions (61) constituting the third leeward auxiliary row block (95c) communicate with the third auxiliary communication space (77c).

Three connecting pipes (110, 120, 130) are attached to the leeward header collecting pipe (70). Each of the connection pipes (110, 120, 130) includes one main pipe part (111, 121, 131) and two branch pipe parts (112a, 112b, 122a, 122b, 132a, 132b) connected to the ends of the main pipe parts (111, 121, 131). ing.

The first connection pipe (110) connects the first leeward auxiliary row block (95a) and the first leeward main row block group (93a). Specifically, in the first connecting pipe (110), the open end of the main pipe portion (111) communicates with the first auxiliary communication space (77a), and the open end of one branch pipe portion (112a) is the first main pipe. The communicating space (75a) communicates, and the open end of the other branch pipe (112b) communicates with the second main communicating space (75b). Accordingly, the first auxiliary communication space (77a) includes the first main communication space (75a) corresponding to the first leeward main row block (92a) and the second main communication space corresponding to the second leeward main row block (92b). Connected to both spaces (75b).

The second connection pipe (120) connects the second leeward auxiliary row block (95b) and the second leeward main row block group (93b). Specifically, in the second connection pipe (120), the open end of the main pipe portion (121) communicates with the second auxiliary communication space (77b), and the open end of one branch pipe portion (122a) is the third main pipe. The communication space (75c) communicates, and the open end of the other branch pipe portion (122b) communicates with the fourth main communication space (75d). Accordingly, the second auxiliary communication space (77b) includes the third main communication space (75c) corresponding to the third leeward main row block (92c) and the fourth main communication space corresponding to the fourth leeward main row block (92d). Connected to both of the spaces (75d).

The third connection pipe (130) connects the third leeward auxiliary row block (95c) and the third leeward main row block group (93c). Specifically, in the third connection pipe (130), the open end of the main pipe part (131) communicates with the third auxiliary communication space (77c), and the open end of one branch pipe part (132a) is the fifth main pipe. The communication space (75e) communicates, and the open end of the other branch pipe portion (132b) communicates with the sixth main communication space (75f). Accordingly, the third auxiliary communication space (77c) includes the fifth main communication space (75e) corresponding to the fifth leeward main row block (92e) and the sixth main communication space corresponding to the sixth leeward main row block (92f). Connected to both space (75f).

<Configuration of shunt>
As described above, the portion forming the lower space (43) in the upwind header collecting pipe (40) constitutes the flow divider (150). When the outdoor heat exchanger (23) functions as an evaporator, the shunt (150) is configured to provide three upwind auxiliary heat exchanges of the gas-liquid two-phase refrigerant supplied to the outdoor heat exchanger (23). Distribute to the parts (38a-38c). Here, the flow divider (150) will be described with reference to FIG.

In the lower space (43), two horizontal partition plates (160, 162) and one vertical partition plate (164) are provided. The lower space (43) is divided into three communication chambers (151 to 153), one mixing chamber (154), two chambers by two horizontal partition plates (160, 162) and one vertical partition plate (164). Partitioned into an intermediate chamber (155,156,).

Specifically, each horizontal partition plate (160, 162) is arranged so as to cross the lower space (43), and partitions the lower space (43) up and down. The lower lateral partition plate (160) is disposed between the first upwind auxiliary row block (55a) and the second upwind auxiliary row block (55b), and the upper lateral partition plate (162) Arranged between the auxiliary row block (55b) and the third upwind auxiliary row block (55c). The vertical partition plate (164) is an elongated rectangular plate-shaped member. The vertical partition plate (164) is disposed along the axial direction of the upwind header collecting pipe (40), and partitions the lower space (43) into the flat tube portion (31) side and the liquid side connection pipe (101) side. .

Of the lower space (43), the lower portion of the lower horizontal partition plate (160) is separated by the vertical partition plate (164) into the first communication chamber (151) on the flat tube (31) side and the liquid side connection tube. It is partitioned into a lower intermediate chamber (155) on the (101) side. The first communication chamber (151) communicates with the three flat tubes (31) constituting the first upwind auxiliary row block (55a).

In the lower space (43), a portion between the lower horizontal partition plate (160) and the upper horizontal partition plate (162) is separated by a vertical partition plate (164) into the second communication chamber on the flat tube (31) side ( 152) and the mixing chamber (154) on the liquid side connecting pipe (101) side. The second communication chamber (152) communicates with the three flat tubes (61) constituting the second upwind auxiliary row block (55b). The mixing chamber (154) communicates with the liquid side connecting pipe (101).

A portion of the lower space (43) above the upper horizontal partition plate (162) is separated by a vertical partition plate (164) from the third communication chamber (153) on the flat tube (31) side and the liquid side connection tube ( 101) partitioned into an upper intermediate chamber (156) on the side. The third communication chamber (153) communicates with the three flat tubes (31) constituting the third upwind auxiliary row block (55c).

One communicating hole (165a, 165b) is formed in the upper part and the lower part of the vertical partition plate (164). Each communication hole (165a, 165b) is a horizontally long rectangular through hole. The communication hole (165b) at the lower part of the vertical partition plate (164) is formed near the lower end of the lower part of the vertical partition plate (164) than the lower horizontal partition plate (160), and the first communication chamber ( 151) is in communication with the lower intermediate chamber (155). The upper communicating hole (165a) of the vertical partition plate (164) is formed near the lower end of the upper part of the vertical partition plate (164) above the upper horizontal partition plate (162), and the third communication chamber (153) Is in communication with the upper intermediate chamber (156).

The lower horizontal partition plate (160) has a flow rate adjusting hole (161) formed in a portion facing the mixing chamber (154). The first communication chamber (151) communicates with the mixing chamber (154) through the flow rate adjusting hole (161). The upper horizontal partition plate (162) has a flow rate adjusting hole (163) formed in a portion facing the mixing chamber (154). The third communication chamber (153) communicates with the mixing chamber (154) through the flow rate adjusting hole (163). The vertical partition plate (164) has a flow rate adjusting hole (166) formed in the vicinity of the lower end of the portion facing the mixing chamber (154). The second communication chamber (152) communicates with the mixing chamber (154) through the flow rate adjusting hole (166).

In the flow divider (150), the flow rate adjustment hole (161) of the lower horizontal partition plate (160), the flow rate adjustment hole (163) of the upper horizontal partition plate (162), and the flow rate adjustment hole of the vertical partition plate (164) (166) is a circular through-hole having a relatively small diameter. The flow divider (150) has an opening area (specifically, a diameter) of the flow rate adjusting holes (161, 163, 166) so that the refrigerant is distributed to each upwind auxiliary row block (55a to 55c) at a predetermined ratio. Is set.

<Manufacture of two-row outdoor heat exchanger>
The two-row outdoor heat exchanger (23) of the present embodiment can be manufactured as follows.

First, as shown in FIG. 11 (A), a large number of fins (32) are parallel to each other at one end portion (flat tube portion (31)) of the flat tube (170) constituting the upwind tube row (50). Wear as follows. In addition, a large number of fins (62) are attached to the other end portion (flat tube portion (61)) of the flat tube (170) constituting the leeward tube row (90) so as to be parallel to each other. At this time, the fin (32) on the leeward tube row (50) side and the fin (62) on the leeward tube row (90) side are a cross-sectional view taken along line XIB-XIB and a cross-sectional view taken along line XIC-XIC in FIG. 11 (B) and 11 (C), the protrusions (188) are flat so as to be in the opposite direction (downward in FIG. 11 (B) and upward in FIG. 11 (C)). Attaching to the pipe (170) (fin attachment process).

Further, a portion between the fin group (33) of the windward tube row (50) and the fin group (33) of the leeward tube row (90) shown in FIG. The fin (32, 62) is not attached to this part (gap part (140)).

Then, the flat tube (170) is bent between the one end and the other end using a bending die (201), so that the upwind tube row (50) and the leeward wind are connected as shown in FIGS. The outdoor heat exchanger (23) is formed so that the tube rows (90) are parallel. When the flat tube (170) is bent, the fin (32) on the upwind tube row (50) side of the bending die (201) with respect to the gap portion (140) in the state before the bending shown in FIG. Is arranged on the side where the projecting portion (188) is not formed (the side where the projecting portion (188) of the fin (62) on the leeward tube row (90) side is formed).

In the state where the flat tube (170) is bent, the fin (32) on the windward tube row (50) side and the fin (62) on the leeward tube row (90) side are protruding portions as shown in FIG. (188) They face each other in the same direction (tube row forming step). As described above, the flat tube (170) is connected to the flat tube (170) between the fin (32) on the upwind tube row (50) side and the fin (62) on the leeward tube row (90) side. , 62) is bent at the part where it is not attached, so that a gap (140) is formed between the flat tube portion (31) of the windward tube row (50) and the flat tube portion (61) of the leeward tube row (90). A U-shaped bent pipe portion (bent portion) (173) is formed, and an outdoor heat exchanger (23) having a two-row structure can be manufactured.

The step of bending the flat tube (170) is performed after brazing the fins (32, 62) and the header collecting pipe (40, 70) to the flat tube (170).

-Effects of the embodiment-
According to the present embodiment, the protrusion (188) of the fin (32) on the upwind tube row (50) side and the protrusion (188) of the fin (62) on the leeward tube row (90) side are in the same direction. The facing two-row outdoor heat exchanger (23) can be easily formed, and erroneous assembly can be prevented. If the fins (32, 62) are arranged so that the protrusions (188) face the windward side, there is no protrusion on the leeward side of each fin (32, 62). The condensed water droplets flow down the heat exchanger through the downstream portion of each row of fins (32, 62) in the air flow direction. Therefore, when this outdoor heat exchanger (23) is used as an evaporator, it is possible to prevent frost formation from proceeding.

When a gap is formed as shown in FIG. 4 between the fin (32) on the windward tube row (50) side and the fin (62) on the leeward tube row (90) side, the windward tube row (50) When water droplets condensed on the fin (32) on the side flow through the edge on the downstream side, the water droplet flows smoothly without being stopped by the protrusion (188) of the fin (62) on the leeward tube row (90) side . Therefore, when using this outdoor heat exchanger (23) as an evaporator, the effect which prevents that frost formation progresses can be heightened.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

For example, in the above embodiment, an example in which the protrusion (188) is formed between the notch (186) and the notch (186) of the fin (32, 62) has been described. 62) in which the protrusion (188) is not formed, the fin (32) on the windward tube row (50) side edge on the tube insertion portion (187) side and the fin on the leeward tube row (90) side You may arrange | position so that the edge part by the side of the pipe insertion part (187) of (62) may face the same direction. Even in this case, the water droplets condensed on the flat tube portions (31, 61) flow down the heat exchanger through the downstream portions of the fins (32, 62) in the air flow direction. Therefore, when this outdoor heat exchanger (23) is used as an evaporator, it is possible to prevent frost formation from proceeding.

In the above embodiment, a gap is formed between the fin (32) on the windward tube row (50) side and the fin (62) on the leeward tube row (90) side. It does not have to be provided.

Moreover, in the said embodiment, in a tube row formation process, as shown in FIG. 12, the U-shaped bending part (173) is a three-dimensional U-shaped bending part which remove | deviates from the plane of this flat tube (170). However, as shown in FIG. 13, the bent portion (173) is approximately 45 ° on each of the flat tube portion (31) side and the flat tube portion (61) side with respect to the bending die (203). You may form by bending so that a bending part (173a) may be formed.

Further, in the tube row forming step of bending the flat tube (170) into a U shape at the intermediate portion, the U-shaped bent portion (173) is formed as a flat surface of the flat tube (170) as shown in FIG. It may be a planar bent part along the line.

Moreover, in the said embodiment, the flat pipe part (31) which is a flat tube of the said windward pipe row (50) and the flat pipe part (61) which is a flat pipe of the leeward pipe row (90) are shown in FIG. As shown, the positions may be shifted in a direction (the arrangement direction of the flat tube portions (31, 61)) perpendicular to the flat side surface portions of both flat tube portions (31, 61). This is a so-called staggered arrangement. In this way, the air that passes between the flat tube portion (31) and the flat tube portion (31) of the upwind tube row (50) without contacting the flat tube portion (31) becomes the leeward tube row (90). Since it passes in the state which contacts the flat pipe part (61), the air volume which does not contact with the flat pipe part (31, 61) decreases, and heat exchange efficiency can be improved.

Further, the present invention provides an upwind tube row (50) and a leeward tube row (90), each of which is constituted by a plurality of flat tube portions (31, 62) arranged in parallel and arranged in the air flow direction, In the heat exchanger (23) having a two-row structure including fins (32, 62) joined to the pipe portion (31, 61), the windward pipe row (50) side and the leeward pipe row (90) side; As long as the edges of the fins (32, 62) on the tube insertion part (187) side or the protrusions (188) are arranged in the same direction, other configurations may be changed as appropriate. Good.

As described above, the present invention is useful for a heat exchanger manufacturing method and a heat exchanger that have flat tubes and fins to exchange heat between refrigerant and air.

23 Outdoor heat exchanger 31 Flat tube portion 32 Fin 33 Fin group 50 Upwind tube row 61 Flat tube portion 62 Fin 63 Fin group 90 Downward tube row 140 Gap portion 170 Flat tube 173 Bending portion 186 Notch portion 187 Pipe insertion portion 188 Protrusion

Claims

An upwind tube row (50) and a leeward tube row (90) each formed by a plurality of flat tube portions (31, 61) arranged in parallel and arranged in the air flow direction, and the flat tube portions (31, 61) And a fin (32, 62) joined to the heat exchanger.
A plurality of notches (186) formed at a certain interval on one edge, and a flat tube (31, 61) formed from the notches (186) toward the other edge are inserted. A plurality of fins (32, 62) having a tube insertion portion (187) having a flat tube portion (31) of the windward tube row (50) and a flat tube portion (61) of the leeward tube row (90). A fin mounting step of mounting the flat tube (170) on one end and the other end of the flat tube (170) with the edges on the tube insertion portion (187) side facing each other;
The above-mentioned flat tubes (170) are bent between one end and the other end so that the edges on the tube insertion portion (187) side of the fins (32, 62) face in the same direction. (50) and a tube row forming step for forming a leeward tube row (90);
A method for producing a heat exchanger, comprising:
In claim 1,
The fin (32, 62) has a protruding portion (188) formed between the adjacent notch portions (186) and protruding from the flat tube portion (31, 61) at the one edge portion. And
In the tube row forming step, the protrusion (188) of the fin (32) on the upwind tube row (50) side and the protrusion (188) of the fin (62) on the leeward tube row (90) side are in the same direction. A method of manufacturing a heat exchanger, wherein the flat tubes (170) are bent between one end and the other end so as to face the surface.
In claim 1 or 2,
It is characterized in that a gap is formed between the fin (32) on the upwind tube row (50) and the fin (62) on the leeward tube row (90) side by side in the air flow direction after the tube row forming step A method for manufacturing a heat exchanger.
In any one of Claims 1-3,
In the fin mounting step, a plurality of fins (32, 62) are mounted on one end portion and the other end portion of the flat tube portion (31), whereby the fin group (33) and the leeward tube in the upwind tube row (50) A heat exchanger characterized by forming a fin group (63) in a row and forming a gap (140) between the fin groups (33, 63) without the fins (32, 62). Production method.
In any one of Claims 1-4,
The tube row forming step is a step of bending the flat tube (170) in a U shape between the one end and the other end, and the U-shaped bent portion (173) is bent into the flat tube (170). A method of manufacturing a heat exchanger, characterized in that it is a step of forming a three-dimensional bent portion (173) that deviates from the plane.
In any one of Claims 1-4,
The tube row forming step is a step of bending the flat tube (170) in a U shape between the one end and the other end, and the U-shaped bent portion (173) is bent into the flat tube (170). A method of manufacturing a heat exchanger, characterized in that it is a step of forming a flat bent portion (173) along the plane of the above.
In any one of Claims 1-6,
In the tube row forming step, the flat tube (170) is placed on the flat tube portion (31) of the windward tube row (50) and the flat tube portion (61) of the leeward tube row (90). A method of manufacturing a heat exchanger, characterized in that it is a step of bending so as to shift in the arrangement direction of the sections (31, 61).
An upwind tube row (50) and a leeward tube row (90) each formed by a plurality of flat tube portions (31, 61) arranged in parallel and arranged in the air flow direction, and the flat tube portions (31, 61) And a fin (32, 62) joined to the heat exchanger,
The fins (32, 62) include a plurality of notches (186) formed at a certain interval on one edge, and a flat tube formed from the notches (186) toward the other edge. A pipe insertion part (187) into which the part (31, 61) is inserted,
The edge on the tube insertion portion (187) side of the fin (32) on the upwind tube row (50) side and the edge on the tube insertion portion (187) side of the fin (62) on the leeward tube row (90) side are Placed in the same direction,
Each flat tube portion (31) of the above-mentioned windward tube row (50) and each flat tube portion (61) of the leeward tube row (90) bend one flat tube (170) between both tube rows. A bent portion (173) is formed between the flat tube portion (31) of the upwind tube row (50) and the flat tube portion (61) of the leeward tube row (90). Heat exchanger.
In claim 8,
The fin (32, 62) has a protruding portion (188) formed between the adjacent notch portions (186) and protruding from the flat tube portion (31, 61) at the one edge portion. ,
The protrusion (188) of the fin (32) on the upwind tube row (50) side and the protrusion (188) of the fin (62) on the leeward tube row (90) side face the same direction. Heat exchanger.