JP2013036696A - Heat exchanger and freezer unit including the same - Google Patents

Abstract

A heat exchanger capable of improving the bending workability of a heat exchanging section and a refrigeration unit having the heat exchanger are provided.
A first refrigerant-refrigerant heat exchange part (62), a second refrigerant-refrigerant heat exchange part (72), and a connecting member (73) are provided. The first refrigerant-refrigerant heat exchanger has a first flat tube (74) through which the refrigerant flows and a second flat tube (75) in close contact with the first flat tube through which the refrigerant flows. Heat exchange is performed between the refrigerant flowing in the flat tube and the refrigerant flowing in the second flat tube. The second refrigerant-refrigerant heat exchanger has a third flat tube (74) through which the refrigerant flows, and a fourth flat tube (75) in close contact with the third flat tube through which the refrigerant flows, Heat exchange is performed between the refrigerant flowing in the flat tube and the refrigerant flowing in the fourth flat tube. The connecting member is disposed so as to connect the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part between the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part. Is done.
[Selection] Figure 3

Description

  The present invention relates to a heat exchanger and a refrigeration apparatus unit including the heat exchanger.

  Conventionally, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-163004), a heat exchanger including a first flat tube and a heat exchange unit including a second flat tube that is in close contact with the first flat tube has been proposed. Has been. In this heat exchanger, heat exchange is performed between the refrigerant flowing inside the first flat tube and the refrigerant flowing inside the second flat tube.

  The heat exchanger may be used in a bent state in order to be accommodated in a space in the apparatus in which it is arranged. In this case, there is a concern that the heat exchange part may be deformed depending on the bending direction or the like during bending.

  Then, the subject of this invention is providing the heat exchanger which can improve the bending workability of a heat exchange part, and a refrigeration apparatus unit provided with the same.

  A heat exchanger according to a first aspect of the present invention includes a first refrigerant-refrigerant heat exchange unit, a second refrigerant-refrigerant heat exchange unit, and a connecting member. The first refrigerant-refrigerant heat exchange unit includes a first flat tube in which the refrigerant flows and a second flat tube in close contact with the first flat tube and in which the refrigerant flows, and the refrigerant flowing in the first flat tube; Heat exchange is performed with the refrigerant flowing in the second flat tube. The second refrigerant-refrigerant heat exchange unit includes a third flat tube in which the refrigerant flows and a fourth flat tube in close contact with the third flat tube and in which the refrigerant flows, and the refrigerant flowing in the third flat tube; Heat exchange is performed with the refrigerant flowing in the fourth flat tube. The connecting member is disposed so as to connect the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part between the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part. Is done.

  The heat exchanger according to the first aspect of the present invention includes a third refrigerant-refrigerant heat exchange having the same configuration as those of the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part. Part, 4th refrigerant | coolant-refrigerant heat exchange part ....

  Here, the heat exchanger may be used in a bent state depending on the size of the internal space of the device to be arranged. In such a case, it is conceivable that the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part are deformed depending on the bending direction or the like during bending.

  Therefore, in the heat exchanger according to the first aspect of the present invention, the first refrigerant-refrigerant heat exchange unit and the second refrigerant-refrigerant heat exchange unit and the second refrigerant-refrigerant heat exchange unit are connected to each other. Since the connecting member is disposed between the refrigerant and the refrigerant heat exchanging portion, the deformation is easily suppressed. Thereby, the bending workability of the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part can be improved.

  A heat exchanger according to a second aspect of the present invention is the heat exchanger according to the first aspect of the present invention, wherein the connecting member is connected to the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part. It has a predetermined length in the orthogonal direction.

  In the heat exchanger according to the second aspect of the present invention, the connecting member serves as a spacer member that secures a gap between the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part. . Thus, for example, when it is necessary to dispose the first refrigerant-refrigerant heat exchange unit and the second refrigerant-refrigerant heat exchange unit with a predetermined gap, the first refrigerant-refrigerant heat exchange unit and the A gap between the two refrigerant-refrigerant heat exchanger can be secured.

  A heat exchanger according to a third aspect of the present invention is a heat exchanger according to the first aspect or the second aspect of the present invention, wherein the first flat tube, the second flat tube, the third flat tube, and the first The 4 flat tubes are arranged such that a wide flat portion extending in the longitudinal direction faces the vertical direction. Moreover, the 1st flat tube, the 2nd flat tube, the 3rd flat tube, and the 4th flat tube are bent and formed around the axis | shaft extended in an up-down direction with a connection member.

  In the heat exchanger according to the third aspect of the present invention, the first flat tube, the second flat tube, the third flat tube, and the fourth flat tube are bent in such a direction that is difficult to bend. Even if it is a case (that is, even when there is a possibility of deformation in the vertical direction by being bent in this way), because the vertical direction, which is the direction in which the deformation occurs, is constrained by the connecting member, Deformation can be suppressed.

  The heat exchanger which concerns on the 4th viewpoint of this invention is a heat exchanger which concerns on either of the 1st viewpoint of this invention-3rd viewpoint, Comprising: A connection member is a 1st refrigerant | coolant-refrigerant heat exchange part and 2nd. It is fixed to the refrigerant-refrigerant heat exchanger by brazing.

  In the heat exchanger according to the fourth aspect of the present invention, since the connecting member is fixed to the first refrigerant-refrigerant heat exchanger and the second refrigerant-refrigerant heat exchanger by brazing, for example, the connecting member is fixed. When the first refrigerant-refrigerant heat exchange unit and the second refrigerant-refrigerant heat exchange unit thus connected are connected to other members, processing is facilitated.

  The heat exchanger which concerns on the 5th viewpoint of this invention is a heat exchanger which concerns on either of the 1st viewpoint of this invention-4th viewpoint, Comprising: A connection member is a heat-transfer fin.

  In the heat exchanger according to the fifth aspect of the present invention, heat transfer fins that are generally used in heat exchangers are used as connecting members. Therefore, bending workability can be easily improved by using a member generally used as a connecting member.

  A refrigeration unit according to a sixth aspect of the present invention includes the heat exchanger according to the fifth aspect of the present invention and a fan that generates an air flow. The heat exchanger is disposed at a position where air does not pass, or an air contact avoiding member for avoiding contact of air with the heat exchanger is disposed in the vicinity of the heat exchanger.

  In the refrigeration unit according to the sixth aspect of the present invention, heat exchange with air at the heat transfer fins can be avoided. Further, this causes heat between the refrigerant flowing in the first flat tube in contact with the upper end or lower end of the heat transfer fin and the refrigerant flowing in the second flat tube in contact with the upper end or lower end of the heat transfer fin. It becomes possible to exchange.

  The refrigeration unit according to the seventh aspect of the present invention is the refrigeration unit according to the sixth aspect of the present invention, further comprising an air-refrigerant heat exchanger. The air-refrigerant heat exchanger has an air-refrigerant heat exchanger. The air-refrigerant heat exchanger has a fifth flat tube through which the refrigerant flows, and performs heat exchange between the refrigerant and air. The heat exchanger and the air-refrigerant heat exchanger are integrated.

  In the refrigeration unit according to the seventh aspect of the present invention, the heat exchanger and the air-refrigerant heat exchanger can be integrated to save space and reduce the number of assembly steps and the number of parts during assembly. it can.

  In the heat exchanger according to the first aspect of the present invention, the bending workability of the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part can be improved.

  In the heat exchanger according to the second aspect of the present invention, a gap between the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part can be easily secured.

  In the heat exchanger according to the third aspect of the present invention, deformation can be suppressed.

  The heat exchanger according to the fourth aspect of the present invention is easy to process.

  In the heat exchanger according to the fifth aspect of the present invention, it is possible to easily improve the bending workability by using a commonly used member as the connecting member.

  In the refrigeration unit according to the sixth aspect of the present invention, heat exchange with the air in the heat transfer fin can be avoided, and the refrigerant flowing in the first flat tube and the second flat tube are flowed through the heat transfer fin. It becomes possible to exchange heat with the refrigerant.

  In the refrigeration unit according to the seventh aspect of the present invention, space can be saved, and the number of assembly steps and the number of parts during assembly can be reduced.

The schematic block diagram of an air conditioning apparatus provided with the integrated heat exchanger which has the economizer heat exchanger which concerns on this invention, and the freezing apparatus unit which concerns on this invention. The schematic diagram of an integrated heat exchanger. Part of sectional drawing which cut | disconnected the integrated heat exchanger along the longitudinal direction and the perpendicular direction of a flat tube, a 1st flat tube, and a 2nd flat tube. The schematic block diagram of a heat source side heat exchanger. The schematic block diagram of an economizer heat exchanger. FIG. 4 is a horizontal cross-sectional view of the header taken along the cutting line VI-VI in FIG. 3. FIG. 4 is a horizontal cross-sectional view of the header, cut along a cutting line VII-VII in FIG. 3. The front view of a pipe bonding member. The front view of a pipe fixing member. The front view of a spacer member. The figure which showed the refrigerant | coolant-refrigerant heat exchange part (when laminated | stacked in two steps | paragraphs) bent around the Y-axis in the state where the connection member is not arrange | positioned. The figure which showed the refrigerant | coolant-refrigerant heat exchange part (when laminated | stacked on 3 steps | paragraphs) bent around the Y-axis in the state where the connection member is not arrange | positioned. FIG. 6 is a schematic diagram of an integrated heat exchanger according to Modification C. FIG. 6 is a schematic diagram of an integrated heat exchanger according to Modification D. The schematic block diagram of the air conditioning apparatus which has a refrigerant circuit including an intercooler.

  Hereinafter, an embodiment of an economizer heat exchanger according to the present invention will be described based on the drawings. In addition, embodiment of the economizer heat exchanger which concerns on this invention is one of the specific examples of this invention, Comprising: The technical scope of this invention is not limited.

(1) Configuration of Air Conditioner 1 FIG. 1 is a refrigeration apparatus including an integrated heat exchanger 3 having an economizer heat exchanger 7 according to the present invention and an outdoor unit 20 as a refrigeration apparatus unit according to the present invention. It is a schematic block diagram of the air conditioning apparatus 1 as an example. FIG. 2 is a schematic configuration diagram of the integrated heat exchanger 3. The air conditioner 1 includes a refrigerant circuit 10 configured to be capable of cooling operation, and performs a two-stage compression refrigeration cycle using a refrigerant that operates in a supercritical region such as carbon dioxide.

  The refrigerant circuit 10 mainly includes a compression mechanism 2, an integrated heat exchanger 3, an expansion mechanism 4, and a use side heat exchanger 5. The compression mechanism 2, the integrated heat exchanger 3, and the expansion mechanism 4 are accommodated in the outdoor unit 20, and the use side heat exchanger 5 is accommodated in the indoor unit 30 as a refrigeration unit. The outdoor unit 20 and the indoor unit 30 are connected via the refrigerant communication pipe 13. Hereinafter, the components of the refrigerant circuit 10 will be described.

(2) Components of refrigerant circuit 10 (2-1) Compression mechanism 2
The compression mechanism 2 includes a compressor 21 that compresses a refrigerant in two stages using two compression elements. The compressor 21 has a sealed structure in which a compression element drive motor 21b, a drive shaft 21c, a front-stage compression element 2c, and a rear-stage compression element 2d are accommodated in a casing 21a. The compression element drive motor 21b is connected to the drive shaft 21c. The drive shaft 21c is connected to the front-stage compression element 2c and the rear-stage compression element 2d. That is, the compressor 21 has a single-shaft two-stage compression structure in which the compression element drive motor 21b drives the front-stage compression element 2c and the rear-stage compression element 2d via one drive shaft 21c.

  The compressor 21 sucks low-pressure refrigerant from the suction pipe 2a, compresses the sucked refrigerant by the front-stage compression element 2c, and then discharges the compressed intermediate-pressure refrigerant to the intermediate-pressure refrigerant pipe 9. Next, the compressor 21 sucks in the intermediate pressure refrigerant discharged to the intermediate pressure refrigerant pipe 9, compresses the sucked refrigerant by the rear-stage compression element 2d, and then discharges the compressed high-pressure refrigerant into the discharge pipe 2b. To discharge.

(2-2) Integrated heat exchanger 3
The integrated heat exchanger 3 is a heat exchanger configured by integrating a heat source side heat exchanger 6 and an economizer heat exchanger 7. Hereinafter, the heat source side heat exchanger 6 and the economizer heat exchanger 7 will be described.

(2-2-1) Heat source side heat exchanger 6
The heat source side heat exchanger 6 is a radiator that cools the high-pressure refrigerant compressed by the compression mechanism 2. In the heat source side heat exchanger 6, heat exchange is performed between air as a cooling source and the refrigerant flowing in the heat source side heat exchanger 6. The air flow passing through the heat source side heat exchanger 6 is generated by the fan 11. One end of the heat source side heat exchanger 6 is connected to the compression mechanism 2 via the first high-pressure refrigerant pipe 3a and the discharge pipe 2b. The first high-pressure refrigerant pipe 3a is a refrigerant pipe connected to the inlet of the heat source side heat exchanger 6 and the discharge pipe 2b. The other end of the heat source side heat exchanger 6 is connected to an economizer heat exchanger 7 and an injection unit 8 to be described later via a second high pressure refrigerant pipe 3b. The second high-pressure refrigerant pipe 3b includes an outlet of the heat source side heat exchanger 6, an inlet of the economizer heat exchanger 7 (an inlet of a refrigerant flow path sent from the heat source side heat exchanger 6 to the expansion mechanism 4), and an injection unit. 8 is a refrigerant pipe connected to 8 inlets (an inlet of a refrigerant flow path branched from the second high-pressure refrigerant pipe 3b).

(2-2-2) Economizer heat exchanger 7
The economizer heat exchanger 7 exchanges heat between the high-pressure refrigerant sent from the heat source side heat exchanger 6 to the expansion mechanism 4 and the intermediate-pressure refrigerant flowing through the injection unit 8. Here, the injection unit 8 will be described.

  The injection unit 8 branches the high-pressure refrigerant sent from the heat source side heat exchanger 6 to the expansion mechanism 4 and returns it to the inlet of the rear stage side compression element 2d. Specifically, the injection unit 8 branches the refrigerant from the second high-pressure refrigerant pipe 3 b and returns it to the intermediate pressure refrigerant pipe 9. The injection unit 8 includes a first injection tube 8a and a second injection tube 8b. The first injection pipe 8a connects the second high-pressure refrigerant pipe 3b and the inlet of the economizer heat exchanger 7 (the inlet of the refrigerant flow path branched from the second high-pressure refrigerant pipe 3b). The second injection pipe 8 b connects the outlet of the economizer heat exchanger 7 (the outlet of the refrigerant flow path branched from the second high-pressure refrigerant pipe 3 b) and the intermediate pressure refrigerant pipe 9. The first injection pipe 8a is provided with an injection valve 8c that functions as a return valve capable of opening degree control. The injection valve 8c is, for example, an electric expansion valve. The injection valve 8 c reduces the high-pressure refrigerant branched from the second high-pressure refrigerant pipe 3 b to near the intermediate pressure that is the pressure of the refrigerant flowing in the intermediate-pressure refrigerant pipe 9.

  In the economizer heat exchanger 7, the high-pressure refrigerant sent from the heat source side heat exchanger 6 to the expansion mechanism 4 is cooled by heat exchange with the intermediate-pressure refrigerant flowing through the injection unit 8. The intermediate-pressure refrigerant flowing through the injection unit 8 is heated and evaporated by heat exchange with the high-pressure refrigerant sent from the heat source side heat exchanger 6 to the expansion mechanism 4 while temporarily flowing in a gas-liquid two-phase state. The evaporated intermediate pressure refrigerant passes through the second injection pipe 8 b and then merges with the refrigerant flowing in the intermediate pressure refrigerant pipe 9.

  Although the integrated heat exchanger 3 has been described above, the specific configuration of the integrated heat exchanger 3 will be described in detail later.

(2-3) Expansion mechanism 4
The expansion mechanism 4 is, for example, an electric expansion valve. Before the high-pressure refrigerant cooled in the heat source side heat exchanger 6 and the economizer heat exchanger 7 is sent to the use side heat exchanger 5, the expansion mechanism 4 is near a low pressure in the refrigeration cycle. Depressurize until. One end of the expansion mechanism 4 is connected to the economizer heat exchanger 7 via the third high-pressure refrigerant pipe 3c. The third high-pressure refrigerant pipe 3 c is a refrigerant pipe connected to the outlet of the economizer heat exchanger 7 (the outlet of the flow path of the refrigerant sent from the heat source side heat exchanger 6 to the expansion mechanism 4) and the inlet of the expansion mechanism 4. It is. The expansion mechanism 4 is connected to the use side heat exchanger 5 via the refrigerant communication pipe 13 (specifically, the liquid side refrigerant communication pipe) and the first low-pressure refrigerant pipe 5a. The first low-pressure refrigerant pipe 5 a is a refrigerant pipe connected to the refrigerant communication pipe 13 (specifically, the liquid side refrigerant communication pipe) and the inlet of the use side heat exchanger 5.

(2-4) Use side heat exchanger 5
The use side heat exchanger 5 is an evaporator that heats and evaporates the low-pressure refrigerant decompressed by the expansion mechanism 4. The use side heat exchanger 5 exchanges heat between air as a heating source and the refrigerant flowing in the use side heat exchanger 5. The air flow passing through the use side heat exchanger 5 is generated by the fan 12. One end of the use side heat exchanger 5 is connected to the expansion mechanism 4 via the refrigerant communication pipe 13 (specifically, the liquid side refrigerant communication pipe) and the first low-pressure refrigerant pipe 5a. The other end of the use side heat exchanger 5 is connected to the compression mechanism 2 via the second low-pressure refrigerant pipe 5b, the refrigerant communication pipe 13 (specifically, the gas side refrigerant communication pipe), and the suction pipe 2a. ing. The second low-pressure refrigerant pipe 5b is a refrigerant pipe that connects the outlet of the use side heat exchanger 5 and the refrigerant communication pipe 13 (specifically, the gas side refrigerant communication pipe).

(3) Configuration of Integrated Heat Exchanger 3 FIG. 3 shows the integrated heat exchanger 3 cut along the longitudinal and vertical directions of flat tube 64, first flat tube 74, and second flat tube 75, which will be described later. FIG. FIG. 4 is a schematic configuration diagram of the heat source side heat exchanger 6. FIG. 5 is a schematic configuration diagram of the economizer heat exchanger 7. FIG. 6 is a horizontal sectional view of the header 61 taken along the cutting line VI-VI in FIG. FIG. 7 is a horizontal sectional view of the header 71 taken along the cutting line VII-VII in FIG. FIG. 8 is a front view of the pipe bonding member 43a. FIG. 9 is a front view of the tube fixing member 43b. FIG. 10 is a front view of the spacer member 43c. Note that the front views of FIGS. 8 to 10 represent views viewed in the direction of arrow A shown in FIG.

  As shown in FIG. 2, the integrated heat exchanger 3 has a two-stage structure in which an economizer heat exchanger 7 is disposed above the heat source side heat exchanger 6.

(3-1) Configuration of Heat Source Side Heat Exchanger 6 As shown in FIGS. 3 and 4, the heat source side heat exchanger 6 mainly includes a pair of headers 61, an air-refrigerant heat exchanger 62, and a plurality of headers 61. And corrugated fins 63. In the heat source side heat exchanger 6, air-refrigerant heat exchanging portions 62 and corrugated fins 63 are alternately stacked, and headers 61 are provided at both ends in the longitudinal direction of the flat tube 64 included in the air-refrigerant heat exchanging portion 62. Are connected.

(3-1-1) Header 61
The header 61 is a cylindrical metal member that is disposed so as to extend in the vertical direction, and whose upper and lower ends are closed. The header 61 is made of a metal such as aluminum or an aluminum alloy. As shown in FIG. 3, the header 61 includes a main member 41 that mainly forms the header 61. The main member 41 is formed with a main channel 41a and a plurality of communication channels 41b extending in a direction perpendicular to the main channel 41a. The main flow path 41a is formed so that the refrigerant flows in the vertical direction. The communication channel 41b is formed such that the refrigerant branches from the main channel 41a and flows in the horizontal direction. Each communication channel 41b is formed at a predetermined interval in the vertical direction. The communication channel 41 b communicates with a refrigerant channel hole 64 a (described later) of the flat tube 64.

(3-1-2) Air-refrigerant heat exchanger 62
The air-refrigerant heat exchange unit 62 is configured by a flat tube 64. The flat tube 64 is a plate-like metal tube in which a plurality of refrigerant flow path holes 64 a are formed and elongated in a direction perpendicular to the longitudinal direction of the header 61. In addition, the flat tube 64 is comprised from the metal from aluminum or aluminum alloy. The plurality of refrigerant passage holes 64a are formed to be parallel to each other. Further, the flat tubes 64 are arranged so that the wide flat surface portions 65 extending in the longitudinal direction face the vertical direction and are spaced apart from each other by a predetermined distance.

(3-1-3) Corrugated fin 63
The corrugated fins 63 are heat transfer fins made of corrugated metal (for example, aluminum or aluminum alloy). The corrugated fins 63 are disposed between the flat tubes 64 and are fixed to the flat portion 65 of the flat tubes 64 by brazing. The corrugated fins 63 together with the flat tubes 64 form an air flow path 63a through which air that exchanges heat with the refrigerant flowing in the flat tubes 64 flows. In the air flow path 63a, air flows in a direction orthogonal to the extending direction of the corrugated fins 63 (that is, a direction from the front side to the back side in FIG. 4). Since the corrugated fin 63 secures a wide heat transfer area, the refrigerant flowing through the flat tube 64 and the air passing through the air flow path 63a are efficiently heat-exchanged.

  Although not shown, the flat tube 64 and the corrugated fin 63 have a shape bent around the Y axis (see FIGS. 4 and 5) extending in the vertical direction when connected to the header 61. doing. More specifically, the heat source side heat exchanger 6 is configured such that the shape in plan view has a U-shape. That is, the flat tube 64 and the corrugated fin 63 have a shape in which two locations are bent around the Y axis.

(3-2) Economizer heat exchanger 7
Although not shown, the economizer heat exchanger 7 is configured so that the shape in plan view is the same as that of the heat source side heat exchanger 6 (that is, the shape in plan view is a U-shape). As shown in FIG. 5, a pair of headers 71, a plurality (two in this embodiment) of refrigerant-refrigerant heat exchange units 72, and a connecting member 73 are included. Note that the number of the refrigerant-refrigerant heat exchange units 72 is not limited to two.

(3-2-1) Header 71
The header 71 is a cylindrical metal member that is disposed so as to extend in the vertical direction, and whose upper and lower ends are closed. The header 71 is made of a metal such as aluminum or an aluminum alloy. As shown in FIG. 3, the header 71 has a main member 42 that mainly forms the header.

  The main member 42 is formed with a first main flow path 42a, a first communication flow path 42b, a second main flow path 42c, and a second communication flow path 42d. The first main channel 42a and the second main channel 42c are formed so that the refrigerant flows in the vertical direction. The first communication channel 42b is formed such that the refrigerant flowing through the first main channel 42a branches and flows in the horizontal direction. The first communication channel 42 b is formed with a predetermined interval in the longitudinal direction of the header 71. The second communication channel 42d is formed so that the refrigerant flowing through the second main channel 42c branches and flows in the horizontal direction. The second communication channel 42 d is formed with a predetermined interval in the longitudinal direction of the header 71. The direction of the refrigerant flowing through the first communication channel 42b and the second communication channel 42d is opposite. The first communication channel 42b communicates with the first refrigerant channel hole 74a, and the second communication channel 42d communicates with the second refrigerant channel hole 75a.

(3-2-2) Refrigerant-refrigerant heat exchanger 72
The refrigerant-refrigerant heat exchange unit 72 has a configuration in which headers 71 are connected to both ends in the longitudinal direction. As shown in FIGS. 3 and 5, the refrigerant-refrigerant heat exchange unit 72 includes a first flat tube 74 and a second flat tube 75. In the present embodiment, the first flat tube 74 is disposed in the lower stage, and the second flat tube 75 is disposed in the upper stage.

  The first flat tube 74 is a plate-like metal tube that is elongated in a direction perpendicular to the longitudinal direction of the header 71. The first flat tube 74 is made of aluminum, an aluminum alloy, or the like. The first flat tube 74 mainly has a wide flat surface portion 76 a extending in the longitudinal direction (horizontal direction) and an insertion portion 76 b extending from the flat surface portion 76 a to the header 71 side and inserted into the tube connecting member 43. Yes. The first flat tube 74 is arranged so that the flat portion 76a and the insertion portion 76b (specifically, both end surfaces in the thickness direction) face the vertical direction. In the first flat tube 74, a plurality of first refrigerant flow path holes 74a are formed. Each first refrigerant passage hole 74 a is formed so as to penetrate in the longitudinal direction of the first flat tube 74. In addition, the height position of the end portion on the opposite side to the end portion of the insertion portion 76b that is in contact with the flat surface portion 76a is such that the refrigerant flowing through the first coolant channel hole 74a is in the first communication channel 42b. It is substantially the same as the height position of the 1st communication flow path 42b so that it may flow.

  The second flat tube 75 is a plate-like metal tube that is elongated in a direction perpendicular to the longitudinal direction of the header 71. The second flat tube 75 is made of aluminum, an aluminum alloy, or the like. The second flat tube 75 mainly has a wide flat surface portion 77a extending in the longitudinal direction (horizontal direction) and an insertion portion 77b extending from the flat surface portion 77a to the header 71 side and inserted into a tube connection member 43 described later. doing. The 2nd flat tube 75 is arrange | positioned so that the wide plane part 77a and insertion part 77b (specifically both end surfaces of the thickness direction) extended in a longitudinal direction may face a perpendicular direction. In the second flat tube 75, a plurality of second refrigerant flow holes 75a are formed. Each second refrigerant passage hole 75 a is formed so as to penetrate in the longitudinal direction of the second flat tube 75. Note that the height position of the end portion of the insertion portion 77b opposite to the end portion in contact with the flat portion 77a is such that the refrigerant flowing through the second refrigerant passage hole 75a is in the second communication passage 42d. It is the same as the height position of the second communication channel 42d so that

  The refrigerant-refrigerant heat exchanging portion 72 is arranged so that the first flat tube 74 and the second flat tube 75 are in close contact with each other (that is, the flat portion 76a of the first flat tube 74 and the flat portion of the second flat tube 75). 77a) to be in close contact with each other.

  In addition, each of the plurality of refrigerant-refrigerant heat exchanging parts 72 has an insertion part 76b of the first flat tube 74 (specifically, an end opposite to the end part in contact with the flat part 76a). A distance d1 between the lower surface of the second flat tube 75 and the upper surface of the insertion portion 77b of the second flat tube 75 (specifically, the end portion opposite to the end portion in contact with the flat surface portion 77a). 5) is kept constant, and the distance d2 between the lower surface of the flat portion 76a of the first flat tube 74 and the upper surface of the flat portion 77a of the second flat tube 75 is kept constant. Are arranged in a stacked manner.

  As described above, the economizer heat exchanger 7 has a configuration in which the refrigerant-refrigerant heat exchanger 72 in which one first flat tube 74 and one second flat tube 75 are in close contact with each other is stacked. have. In the economizer heat exchanger 7, the refrigerant flowing in the first flat tube 74 (specifically, the first refrigerant flow hole 74a) and the second flat tube 75 (specifically, the second refrigerant flow). Heat exchange is performed with the refrigerant flowing through the passage hole 75a).

(3-3) Connecting member 73
As shown in FIG. 5, the connecting member 73 is a member having a predetermined length in a direction orthogonal to the refrigerant-refrigerant heat exchanging portion 72 (specifically, a vertical direction), and is a predetermined refrigerant-refrigerant heat exchange. The two refrigerant-refrigerant heat exchange units 72 are connected to each other by being arranged between the unit 72 and the refrigerant-refrigerant heat exchange unit 72 adjacent to the refrigerant-refrigerant heat exchange unit 72. The connecting member 73 is a corrugated fin made of a metal member such as aluminum or aluminum alloy and formed by bending a plate-like member into a corrugated shape in the longitudinal direction. The connecting member 73 has a bent portion at one end (upper mountain fold portion) fixed to the lower surface of the flat portion 76a of the first flat tube 74 by brazing, and a bent portion at the other end (lower end). Is fixed to the upper surface of the flat portion 77a of the second flat tube 75 by brazing, so that the refrigerant-refrigerant heat exchanging portion 72 and the refrigerant-refrigerant heat exchanging portion 72 adjacent thereto are connected. It is connected.

  In addition, the predetermined length which the connection member 73 has is a length which can ensure the distance d1 and the distance d2 uniformly.

  As described above, the connecting member has a function of connecting the two refrigerant-refrigerant heat exchangers 72 and a function as a spacer member for securing a gap between the two refrigerant-refrigerant heat exchangers 72. doing.

(3-4) Pipe connecting member 43
In the present embodiment, the header 61 of the heat source side heat exchanger 6 and the header 71 of the economizer heat exchanger 7 are connected by the pipe connecting member 43. By this tube connecting member 43, the heat source side heat exchanger 6 and the economizer heat exchanger 7 are integrated to form the integrated heat exchanger 3. Hereinafter, the pipe connecting member 43 will be described.

  The pipe connection member 43 is made of a metal member such as aluminum or an aluminum alloy, and includes a pipe bonding member 43a, a pipe fixing member 43b, and a spacer member 43c, as shown in FIGS.

  The pipe bonding member 43a is a plate-like member that extends in the vertical direction and is bonded to the main member 41, the main member 42, the flat tube 64, and the refrigerant-refrigerant heat exchange unit 72. The tube bonding member 43a is a member having a U-shaped cross section cut along a cross section perpendicular to the longitudinal direction thereof. As shown in FIG. 8, the pipe bonding member 43a has a plurality of flat pipe insertion holes 44a in which the flat pipe 64, the first flat pipe 74, and the second flat pipe 75 are inserted in the vertical direction.

  The tube fixing member 43b is a plate-like member extending in the vertical direction and disposed in close contact with the tube bonding member 43a and the spacer member 43c in a space surrounded by the tube bonding member 43a, the main member 41, and the main member 42. . As shown in FIG. 9, the tube fixing member 43b has a plurality of flat tube fastening holes 44b formed along the vertical direction. The flat tube retaining hole 44b is provided at the same height as the flat tube insertion hole 44a. Each flat tube fastening hole 44 b is formed by a flat tube fastening hole forming portion 144. The flat tube fastening hole forming part 144 has a protruding part 144a at the center part where both sides in the height direction approach each other. The protrusion 144a fixes the ends of the flat tube 64, the first flat tube 74, and the second flat tube 75 together with the flat tube insertion hole 44a. The height of the gap formed by the protruding portion 144a is smaller than the thickness of the flat tube 64, the first flat tube 74, and the second flat tube 75.

  The spacer member 43c is a plate extending in the vertical direction and disposed in close contact with the tube fixing member 43b and the main member 41 (or the main member 42) in a space surrounded by the tube bonding member 43a, the main member 41, and the main member 42. It is a shaped member. As shown in FIG. 10, the spacer member 43c has a plurality of spacer holes 44c formed along the vertical direction. The spacer hole 44c is provided at the same height as the flat tube insertion hole 44a and the flat tube retaining hole 44b. The spacer member 43c is provided between the main member 41 and the tube fixing member 43b and between the main member 42 and the tube fixing member 43b in order to form a space including the spacer hole 44c. Part of the end surfaces of the flat tube 64, the first flat tube 74, and the second flat tube 75 are in contact with the end surface of the spacer member 43c, as shown in FIGS.

(4) Manufacturing method of integrated heat exchanger 3 Next, the manufacturing method of the integrated heat exchanger 3 is demonstrated.

  First, the air-refrigerant heat exchanger 62 (flat tube 64) to which the corrugated fins 63 are fixed, and the refrigerant-refrigerant heat exchanger 72 (first flat tube 74 and second flat tube 75) to which the connecting member 73 is fixed. And prepare.

  Next, the refrigerant-refrigerant heat exchanging part 72 is arranged so as to be positioned above the air-refrigerant heat exchanging part 62, and the air-refrigerant heat exchanging part 62 and the refrigerant-refrigerant heat exchanging part 72 are joined with a jig or the like. Use and temporarily fix.

  Next, the air-refrigerant heat exchanging part 62 and the refrigerant-refrigerant heat exchanging part 72, which are temporarily fixed, together with the corrugated fin 63 and the connecting member 73 fixed to each other, a bending apparatus (not shown). Used to bend around the Y axis extending in the vertical direction. The bending apparatus is a bending process by pressing the air-refrigerant heat exchanging unit 62 and the refrigerant-refrigerant heat exchanging unit 72 together with the corrugated fins 63 and the connecting member 73 that are fixed to the bending mold. It is a device that performs.

  On the other hand, in order to indirectly connect the air-refrigerant heat exchanger 62 and the refrigerant-refrigerant heat exchanger 72, a pair of headers 61, a pair of headers 71, and a pipe connecting member 43 are prepared.

  Next, as shown in FIG. 3, the header 61 and the header 71 are arranged such that the communication channel 41b, the first communication channel 42b, and the second communication channel 42d overlap in plan view (specifically, An end surface 66 (see FIG. 6) of the member 41 on the side facing the air-refrigerant heat exchange unit 62, and an end surface 78 (see FIG. 7) of the main member 42 on the side facing the refrigerant-refrigerant heat exchange unit 72. However, the header 61 and the header 71 are arranged so that they match in plan view. Next, the spacer member 43c is brought into close contact with the end surface 66 of the main member 41 on the side facing the air-refrigerant heat exchange unit 62 and the end surface 78 of the main member 42 on the side facing the refrigerant-refrigerant heat exchange unit 72. To place. Next, the pipe fixing member 43b is disposed so as to be in close contact with the end surface of the spacer member 43c. Next, the pipe bonding member 43a is arranged so as to cover the spacer member 43c and the pipe fixing member 43b from the side where the air-refrigerant heat exchange part 62 and the refrigerant-refrigerant heat exchange part 72 are located toward the opposite side.

  Next, the header 61 and the header 71 are connected to the air-refrigerant heat exchange unit 62 and the refrigerant-refrigerant heat exchange unit 72 that are bent around the Y axis. Specifically, by inserting the flat tube 64, the first flat tube 74, and the second flat tube 75 all the way into the flat tube retaining hole 44b of the tube fixing member 43b, the header 61 and the header 71 and the air-refrigerant heat are inserted. The exchange unit 62 and the refrigerant-refrigerant heat exchange unit 72 are connected.

  Finally, the main member 41, the main member 42, the pipe connecting member 43 (the pipe bonding member 43a, the pipe fixing member 43b, and the spacer member 43c), the flat pipe 64, the first flat pipe 74, and the second flat pipe The brazing process which adhere | attaches 75 is performed. Note that the brazing process may not be performed between the main member 41 and the main member 42. Thus, the assembly process of the integrated heat exchanger 3 is completed.

  Here, conventionally, the plurality of refrigerant-refrigerant heat exchange units only need to perform heat exchange between the refrigerant flowing through the first flat tube and the refrigerant flowing through the second flat tube. Nothing is arranged between the refrigerant-refrigerant heat exchanger adjacent to this. However, as described above, the refrigerant-refrigerant heat exchange unit 72 is bent and used around the Y axis extending in the vertical direction. Here, the refrigerant-refrigerant heat exchanging portion 72 is bent around the Y axis in the width direction of the air-refrigerant heat exchanging portion 62 and the refrigerant-refrigerant heat exchanging portion 72 (extending perpendicularly to the Y axis). It is harder to bend than to bend around an axis (see FIGS. 6 and 7). Actually, when the inventors of the present invention bent the refrigerant-refrigerant heat exchange section stacked in two stages and the refrigerant-refrigerant heat exchange section stacked in three stages around the Y axis, respectively, the vertical direction Buckling deformation occurred. This is shown in FIG. 11 and FIG. In FIG. 11 and FIG. 12, the dividing line between the first flat tube 74 and the second flat tube 75 is omitted. In FIGS. 11 and 12, the first flat tube 74 and the second flat tube 75 in the second and lower stages are perpendicular to the flat portions 76a and 77a of the first flat tube 74 and the second flat tube 75, respectively. And only the surface extending in the longitudinal direction (the portion indicated by hatching) is shown.

  Therefore, as in the present embodiment, if the connecting member 73 is disposed between the refrigerant-refrigerant heat exchanging portion 72 and the refrigerant-refrigerant heat exchanging portion 72 and fixed thereto, the refrigerant-refrigerant heat exchanging portion 72 Vertical deformation is constrained. Thereby, even if the refrigerant-refrigerant heat exchange part 72 is bent around the Y axis, buckling deformation of the refrigerant-refrigerant heat exchange part 72 can be suppressed, and bending workability can be improved.

  In the refrigerant-refrigerant heat exchanging unit 72, in order to prevent heat exchange with air, in the present embodiment, the air flow generated by the fan 11 is prevented from flowing into the economizer heat exchanger 7. The bell mouth (not shown) that covers the fan 11 is located at the uppermost position lower than the lower end position of the economizer heat exchanger 7 (specifically, the lower end position of the refrigerant-refrigerant heat exchanger 72). It is configured to do so.

(5) Operation of Air Conditioner (5-1) Overall Operation Next, an operation during the cooling operation of the air conditioner 1 will be described based on the flow of the refrigerant circulating in the refrigerant circuit 10. The low-pressure refrigerant in the refrigeration cycle is sucked into the compression mechanism 2 from the suction pipe 2a. The low-pressure refrigerant sucked into the compression mechanism 2 is compressed to the intermediate pressure in the refrigeration cycle by the pre-stage side compression element 2c and then discharged to the intermediate-pressure refrigerant pipe 9. In the intermediate pressure refrigerant pipe 9, the intermediate pressure refrigerant discharged from the front-stage compression element 2c merges with the intermediate pressure refrigerant returned from the second injection pipe 8b. The merged intermediate-pressure refrigerant is sucked into the rear-stage compression element 2d and compressed to a high pressure in the refrigeration cycle by the rear-stage compression element 2d. The compressed high-pressure refrigerant is discharged from the compression mechanism 2 to the discharge pipe 2b.

  The high-pressure refrigerant discharged from the compression mechanism 2 is sent to the heat source side heat exchanger 6 through the first high-pressure refrigerant pipe 3a. The high-pressure refrigerant sent to the heat source side heat exchanger 6 is cooled by exchanging heat with external air by the heat source side heat exchanger 6. A part of the high-pressure refrigerant cooled by the heat source side heat exchanger 6 is branched into the first injection pipe 8a in the second high-pressure refrigerant pipe 3b. The high-pressure refrigerant branched to the first injection pipe 8a is reduced to near the intermediate pressure in the refrigeration cycle by the injection valve 8c, and then sent to the economizer heat exchanger 7. On the other hand, the high-pressure refrigerant after branching to the first injection pipe 8a (that is, flowing through the second high-pressure refrigerant pipe 3b) is sent to the economizer heat exchanger 7. In the economizer heat exchanger 7, the high-pressure refrigerant from the second high-pressure refrigerant pipe 3b is cooled by exchanging heat with the intermediate-pressure refrigerant from the first injection pipe 8a. On the other hand, the intermediate-pressure refrigerant from the first injection pipe 8a is heated by exchanging heat with the high-pressure refrigerant from the second high-pressure refrigerant pipe 3b, and returned to the intermediate-pressure refrigerant pipe 9 through the second injection pipe 8b.

  The high-pressure refrigerant cooled in the economizer heat exchanger 7 is sent to the expansion mechanism 4 through the third high-pressure refrigerant pipe 3c. The high-pressure refrigerant sent to the expansion mechanism 4 is depressurized by the expansion mechanism 4 to become a low-pressure and gas-liquid two-phase refrigerant in the refrigeration cycle, and the refrigerant communication pipe 13 (liquid side refrigerant communication pipe) and the first low-pressure refrigerant. It is sent to the use side heat exchanger 5 through the pipe 5a. The low-pressure and gas-liquid two-phase refrigerant sent to the use side heat exchanger 5 is heated and evaporated by exchanging heat with external air by the use side heat exchanger 5. The low-pressure refrigerant heated and evaporated in the use-side heat exchanger 5 is again sucked into the compression mechanism 2 through the refrigerant communication pipe (gas-side refrigerant communication pipe), the second low-pressure refrigerant pipe 5b, and the suction pipe 2a. In this way, the air conditioner 1 performs the cooling operation by circulating the refrigerant in the refrigerant circuit 10.

(5-2) Operation of Integrated Heat Exchanger 3 The refrigerant flow in the integrated heat exchanger 3 will be described. First, heat exchange in the heat source side heat exchanger 6, which is a lower heat exchanger of the integrated heat exchanger 3, will be described with reference to FIGS. The high-pressure refrigerant that is discharged from the compression mechanism 2 and flows through the first high-pressure refrigerant pipe 3 a is supplied to the main flow path 41 a in the one header 61. The high-pressure refrigerant flowing through the main channel 41a is divided into the plurality of communication channels 41b and then flows into the first refrigerant channel hole 64a of each flat tube 64. The high-pressure refrigerant is cooled by exchanging heat with the air passing through the air passage 33a in the process of passing through the first refrigerant passage hole 64a of each flat tube 64. Next, the high-pressure refrigerant that has passed through each flat tube 64 flows into the main channel 41 a in the header 61 on the opposite side. Finally, the high-pressure refrigerant is sent from the main flow path 41a to the second high-pressure refrigerant pipe 3b.

  Next, heat exchange in the economizer heat exchanger 7 which is an upper heat exchanger of the integrated heat exchanger 3 will be described with reference to FIGS. 2 and 5. In FIG. 5, in order to explain the flow of the refrigerant, the main flow paths 42 a and 42 c that are originally overlapped when viewed from the front of the paper are shown so as to be arranged side by side when viewed from the front of the paper. The high-pressure refrigerant that is cooled by the heat source side heat exchanger 6 and flows through the second high-pressure refrigerant pipe 3 b is supplied to the first main flow path 42 a in the one header 71. The high-pressure refrigerant flowing through the first main channel 42a is divided into a plurality of first communication channels 42b (see FIG. 3), and then flows into the first refrigerant channel holes 74a of the first flat tubes 74. On the other hand, the intermediate-pressure refrigerant that branches from the second high-pressure refrigerant pipe 3b and is reduced in pressure by the injection valve 8c and flows through the first injection pipe 8a is the second in the header 71 on the opposite side to the side supplied with the high-pressure refrigerant. It is supplied to the main flow path 42c. The intermediate pressure refrigerant flowing through the second main flow path 42c is divided into a plurality of second communication flow paths 42d (see FIG. 3), and then flows into the second refrigerant flow path holes 75a of the second flat tubes 75. The high-pressure refrigerant flowing in the first flat tube 74 is heat-exchanged with the intermediate-pressure refrigerant flowing in the second flat tube 75. As described above, the flow direction of the high-pressure refrigerant in the first flat tube 74 is opposite to the flow direction of the intermediate-pressure refrigerant in the second flat tube 75. The high-pressure refrigerant that has exchanged heat through the first flat tubes 74 flows into the first main flow path 42 a in the header 71 on the opposite side. Finally, the high-pressure refrigerant is sent from the first main flow path 42a to the third high-pressure refrigerant pipe 3c. On the other hand, the intermediate-pressure refrigerant that has exchanged heat through the respective second flat tubes 75 flows into the second main flow path 42 c in the header 71 on the opposite side. Finally, the intermediate pressure refrigerant is sent from the second main flow path 42c to the second injection pipe 8b.

(6) Features (6-1)
In the economizer heat exchanger 7 (corresponding to the heat exchanger) of the present embodiment, as described above, the refrigerant-refrigerant heat exchanging part 72 (corresponding to the first refrigerant-refrigerant heat exchanging part) and the refrigerant adjacent thereto- A connecting member 73 is disposed between the refrigerant heat exchanging unit 72 (corresponding to the second refrigerant-refrigerant heat exchanging unit), and the connecting member 73 includes the refrigerant-refrigerant heat exchanging unit 72 and the refrigerant adjacent thereto. -Arranged fixed to the refrigerant heat exchanging section 72.

  As a result, the flat portion 76a and the flat portion 77a of the first flat tube 74 and the second flat tube 75 constituting the refrigerant-refrigerant heat exchanging portion 72 are directed in the vertical direction (specifically, the vertical direction). Even if the first flat tube 74 and the second flat tube 75 are bent around the Y axis, which is difficult to bend, the vertical deformation of the refrigerant-refrigerant heat exchange unit 72 is restricted. Therefore, buckling deformation of the refrigerant-refrigerant heat exchange part 72 can be suppressed, and bending workability can be improved.

(6-2)
As described above, conventionally, nothing is arranged between the refrigerant-refrigerant heat exchange part and the refrigerant-refrigerant heat exchange part adjacent thereto. Therefore, in the conventional configuration, it is difficult to ensure a constant distance between the refrigerant-refrigerant heat exchange unit and the refrigerant-refrigerant heat exchange unit adjacent thereto.

  On the other hand, in the present embodiment, the connecting member 73 has a predetermined length in the vertical direction (specifically, the vertical direction). This makes it easy to keep the distance between the refrigerant-refrigerant heat exchange unit 72 and the refrigerant-refrigerant heat exchange unit 72 adjacent thereto (specifically, the distance d1 and the distance d2) constant. Therefore, the configuration of the present embodiment is useful when the plurality of refrigerant-refrigerant heat exchanging units 72 are arranged at predetermined intervals as in the present embodiment. In the present embodiment, since the connecting member 73 also functions as a spacer member, the refrigerant-refrigerant heat exchanging portion 72 (specifically, the flat portions 76a and 77a of the insertion portions 76b and 77b are in contact with each other). Flat tube insertion hole 44a and flat tube retaining hole 44b formed in tube connecting member 43 (specifically, tube bonding member 43a and tube fixing member 43b). Therefore, the workability of the economizer heat exchanger 7 can be improved.

  In the present embodiment, the connecting member 73 is fixed to the refrigerant-refrigerant heat exchange unit 72 and the refrigerant-refrigerant heat exchange unit 72 adjacent thereto by brazing. Thereby, the refrigerant | coolant-refrigerant heat exchange part 72 and the connection member 73 are integrated. Therefore, it becomes easy to assemble the refrigerant-refrigerant heat exchanging portion 72 and the connecting member 73 fixed to the refrigerant-refrigerant heat exchanger 72 to other members (in this embodiment, the pipe connecting member 43), and work efficiency can be improved. .

(6-3)
In the present embodiment, the connecting member 73 is a heat transfer fin made of a metal member such as aluminum. In this embodiment, since the member generally applied to a heat exchanger can be applied as the connection member 73, the bending workability of the refrigerant-refrigerant heat exchange unit 72 can be easily improved. Moreover, since the heat-transfer fin comprised from a lightweight metal compared with another metal member is used as the connection member 73, it is easy to process.

  In the present embodiment, as described above, the economizer heat exchanger 7 is arranged at a position where the air flow generated by the fan 11 does not pass by using the bell mouth.

  Thereby, the heat exchange with the air in the connection member 73 can be avoided.

  Further, when a configuration in which a plurality of refrigerant-refrigerant heat exchange portions 72 are stacked as in the present embodiment is adopted, the first flat tube 74 (refrigerant—) fixed to the connecting member 73 via the connecting member 73. The refrigerant flowing in the lower flat tube) of the refrigerant heat exchanging portion 72) and the second flat tube 75 (the flat tube located in the upper portion of the refrigerant-refrigerant heat exchanging portion 72) fixed to the connecting member 73. It is possible to exchange heat with the refrigerant flowing through. Therefore, the heat exchange efficiency in the economizer heat exchanger 7 can be improved.

(6-4)
In the present embodiment, the heat source side heat exchanger 6 (corresponding to an air-refrigerant heat exchanger) and the economizer heat exchanger 7 include headers 61 and 71 (specifically, the pipe connecting member 43 and the headers 61 and 71). ). Thereby, space saving of the outdoor unit 2 can be achieved. Moreover, since the number of parts required for assembly and the number of assembly steps can be reduced as compared with the conventional case, the cost can also be reduced.

(7) Modifications The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to the above-described embodiment, and can be changed without departing from the gist of the invention. .

(7-1) Modification A
In the said embodiment, although the heat transfer fin is used as the connection member 73, it is not restricted to this, Another member may be sufficient. For example, as the connecting member 73, a member made of an insulator that hardly exchanges heat with air may be used. In this case, heat exchange with the air in the connecting member 73 can be avoided even if the bell mouth is not devised.

(7-2) Modification B
In the above embodiment, the bell mouth is used to prevent the airflow from passing through the economizer heat exchanger 7, but the present invention is not limited to this. For example, a heat insulating material may be disposed in the vicinity of the economizer heat exchanger 7 (for example, around the economizer heat exchanger 7) as an air contact avoiding member that avoids contact of the air flow with the economizer heat exchanger 7. .

(7-3) Modification C
FIG. 13 is a schematic diagram of an integrated heat exchanger according to Modification C.

  In the integrated heat exchanger 3 of the above embodiment, the economizer heat exchanger 7 is arranged above the heat source side heat exchanger 6, but as shown in FIG. 13, the heat source is located above the economizer heat exchanger 7. A side heat exchanger 6 may be arranged. Also in this modification, the effect similar to the said embodiment can be achieved.

(7-4) Modification D
FIG. 14 is a schematic diagram of an integrated heat exchanger according to Modification D.

  In the integrated heat exchanger 3 of the above embodiment, the heat source side heat exchanger 6 and the economizer heat exchanger 7 have a two-stage structure in which two heat exchangers are arranged along the vertical direction. As shown in FIG. 14, the heat source side heat exchanger 6, the economizer heat exchanger 7, and the intercooler 106 may have a three-stage structure in which three heat exchangers are arranged along the vertical direction.

  Here, the intercooler 106 will be described. FIG. 15 is a schematic configuration diagram of the air-conditioning apparatus 101 having the refrigerant circuit 110 including the intermediate cooler 106.

  The intermediate cooler 106 is a heat exchanger provided in the intermediate pressure refrigerant pipe 9 in the present embodiment. The intercooler 106 exchanges heat between the refrigerant and the air in the same manner as the heat source side heat exchanger 6. Specifically, the intermediate cooler 106 cools the refrigerant compressed to the intermediate pressure in the refrigeration cycle by the upstream compression element 2c of the compression mechanism 2 by exchanging heat with external air. The intermediate pressure refrigerant cooled by the intermediate cooler 106 merges with the refrigerant returned from the second injection pipe 8b and is sucked into the rear-stage compression element 2d.

  In the integrated heat exchanger 109 in this modification, three heat exchangers are arranged along the vertical direction. As shown in FIG. 14, in the integrated heat exchanger 109, the lower heat exchanger is the heat source side heat exchanger 6, the middle heat exchanger is the intermediate cooler 106, and the upper heat exchanger is the economizer. This is a heat exchanger 7. As in the embodiment, each header of the heat source side heat exchanger 6, the intermediate cooler 106, and the economizer heat exchanger 7 is configured to be at least partially integrated. Also in this modification, the effect similar to the said embodiment can be achieved.

  The arrangement of the three heat exchangers of the integrated heat exchanger 109 may be arbitrary. For example, the integrated heat exchanger 109 may have a configuration in which the intermediate cooler 106 is disposed above the economizer heat exchanger 7.

(7-5) Modification E
In the above embodiment, the first flat tube 74 and the second flat tube 75 have been described as having flat portions 76a and 77a and insertion portions 76b and 77b, respectively. Instead, it may be configured only by the plane portions 76a and 77a. That is, the first flat tube 74 and the second flat tube 75 may be tubes that extend horizontally from one end to the other end. In this case, the connecting member 73 has a length that can secure the distance d2.

(7-6) Modification F
In the above embodiment, it has been described that the connecting member 73 is disposed between the refrigerant-refrigerant heat exchanging portion 72 and the refrigerant-refrigerant heat exchanging portion 72 adjacent thereto by being brazed thereto. However, the connecting member 73 is adjacent to the refrigerant-refrigerant heat exchanger 72 and the refrigerant-refrigerant heat exchanger 72 between the refrigerant-refrigerant heat exchanger 72 and the refrigerant-refrigerant heat exchanger 72 adjacent thereto. What is necessary is just to be arrange | positioned so that the refrigerant | coolant-refrigerant heat exchange part 72 to connect may be connected. In addition, as a connection method in such a case, the method of temporarily fixing using a jig etc. or an adhesive material is mentioned, for example.

  The present invention can be variously applied to a heat exchanger including a refrigerant-refrigerant heat exchange unit in which a plurality of flat tubes are in close contact and heat exchange is performed between the refrigerants flowing in the respective flat tubes.

6 Heat source side heat exchanger (air-refrigerant heat exchanger)
7 economizer heat exchanger (heat exchanger)
11 Fan 20 Outdoor unit (refrigeration unit)
62 Flat tube (5th flat tube)
72 Refrigerant-refrigerant heat exchanger (first refrigerant-refrigerant heat exchanger, second refrigerant-refrigerant heat exchanger)
73 connecting member 74 first flat tube (first flat tube, third flat tube)
75 2nd flat tube (2nd flat tube, 4th flat tube)
76 Plane part 77 Plane part

JP 2007-163004 A

Claims (7)

The first flat tube (74) through which the refrigerant flows and the second flat tube (75) in close contact with the first flat tube and through which the refrigerant flows, the refrigerant flowing through the first flat tube and the first A first refrigerant-refrigerant heat exchange section (72) for exchanging heat with the refrigerant flowing in the two flat tubes;
The third flat tube (74) through which the refrigerant flows and the fourth flat tube (75) in close contact with the third flat tube and through which the refrigerant flows, the refrigerant flowing through the third flat tube and the first A second refrigerant-refrigerant heat exchange section (72) for exchanging heat with the refrigerant flowing in the four flat tubes;
The first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part are arranged to connect the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part between the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part. A connecting member (73) to be made;
A heat exchanger (7) comprising: The connecting member has a predetermined length in a direction perpendicular to the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part,
The heat exchanger according to claim 1. The first flat tube, the second flat tube, the third flat tube, and the fourth flat tube are arranged such that wide flat portions (76, 77) extending in the longitudinal direction face the vertical direction. And
The first flat tube, the second flat tube, the third flat tube, and the fourth flat tube are formed by being bent around an axis extending in the vertical direction together with the connecting member.
The heat exchanger according to claim 1 or 2. The connecting member is fixed to the first refrigerant-refrigerant heat exchange part and the second refrigerant-refrigerant heat exchange part by brazing,
The heat exchanger according to any one of claims 1 to 3. The connecting member is a heat transfer fin,
The heat exchanger according to any one of claims 1 to 4. A heat exchanger (7) according to claim 5;
A fan (11) for generating an air flow;
With
The heat exchanger is disposed at a position where air does not pass, or an air contact avoiding member for avoiding contact of air with the heat exchanger is disposed in the vicinity of the heat exchanger.
Refrigeration unit (20). An air-refrigerant heat exchanger (6) having a fifth flat tube (62) through which the refrigerant flows, and having an air-refrigerant heat exchanger for exchanging heat between the refrigerant and air;
Further comprising
The heat exchanger and the air-refrigerant heat exchanger are integrated.
The refrigeration unit according to claim 6.

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