JP2017155989A - Heat exchanger and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing performance deterioration.SOLUTION: A heat exchanger includes: first heat transfer pipes 21; a first header part 52 that is formed into a cylindrical part, and to which each first heat transfer pipe 21 is communicatively connected in an internal space; second heat transfer pipes 23; a second header part 53 that extends along an axis O and is formed into a cylindrical shape, and to which each second heat transfer pipe 23 is communicatively connected in an internal space; a second header inner partition board 60 configured to section the internal space of the second header part 53 into two regions; and a connection pipe having a connection pipe body whose one end is communicatively connected to the internal space of the first header part 52 on an outer peripheral surface of the first header part 52, and a second end opposite to the first end is communicatively connected to the internal space of the second header part 53 on an outer peripheral surface of the header part 53, and in which an opening part of the second end is in contact with the second header inner partition board 60 and is arranged over the two regions sectioned by the second header inner partition board 60.SELECTED DRAWING: Figure 2

Description

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

  As a heat exchanger for an air conditioner, there is known a heat exchanger tube in which a plurality of heat transfer tubes extending in the horizontal direction are arranged at intervals in the vertical direction and fins are provided on the outer surface of each heat transfer tube. Both ends of the plurality of heat transfer tubes are respectively connected to a pair of headers extending in the vertical direction. In such a heat exchanger, in order to secure the flow path length of the refrigerant, the refrigerant introduced into one header and circulated through the heat transfer tube to the other header is transmitted again so that the other header returns. It is configured to return to one header via a heat pipe.

In the folded-back header, a plurality of regions are defined by a partition plate that partitions the header in the vertical direction. Thus, the refrigerant introduced into the one area in the header via the heat transfer tube is introduced into the other area in the header via the connection pipe, and then the plurality of heat transfer pipes connected to the other area. Is returned to one header on the entrance / exit side.
For example, Patent Document 1 discloses a heat exchanger that includes a connecting pipe having one main pipe part and a branch pipe part that extends in two branches from the main pipe part. In this heat exchanger, the main pipe part is connected to one area in the header, and the branch pipe parts are each connected to one of two other areas in the header. And when using the said heat exchanger as an evaporator, the refrigerant | coolant introduce | transduced into one area | region in the header via the heat exchanger tube is shunted through the main pipe part and branch pipe part in a connection pipe, Introduced into two other areas.

Japanese Patent Laying-Open No. 2015-55404

By the way, when the heat exchanger is used as an evaporator, the refrigerant introduced into one area in the header via the heat transfer tube is not necessarily vaporized, but a liquid phase refrigerant and a gas phase refrigerant. Are in a gas-liquid two-phase refrigerant state. Therefore, depending on the location of the branch pipes, more liquid refrigerant flows through only some of the branch pipes, and the flow rate and gas-liquid ratio of the refrigerant are biased between the branch pipes. In particular, when a bent portion exists on the upstream side of the branch pipe in the main pipe portion, and the main pipe portion and the branch pipe extend in the same plane as the bent portion, only the branch pipe located outside the bend Liquid phase refrigerant tends to concentrate.
In this way, if the liquid-phase refrigerant is biased in each branch pipe, a large change occurs in the refrigerant distribution ratio at the time of branching even if the flow rate of the whole refrigerant is changed. Also, if the refrigerant is diverted with the refrigerant flow rate and gas-liquid ratio being biased, there will be heat transfer tubes with extremely low refrigerant flow rate, and the heat transfer area of the heat exchanger should be fully utilized. I can't.

  Furthermore, in the connection pipe of Patent Document 1, handling is complicated to avoid interference between the plurality of connection pipes, and processing and brazing become difficult. In addition, as a result of an increase in the area occupied by the connecting pipe, it is necessary to reduce the effective area for heat exchange with the air, and heat exchange performance is degraded.

  This invention is made | formed in view of such a subject, Comprising: It aims at providing the heat exchanger which can suppress a performance fall, and the air conditioner using this heat exchanger.

The present invention employs the following means in order to solve the above problems.
That is, the heat exchanger according to the first aspect of the present invention includes a first heat transfer tube in which a plurality of refrigerants are circulated and arranged at intervals, and each first heat transfer tube is formed in a cylindrical shape. A first header connected in communication with the space; a second heat transfer tube in which a plurality of refrigerants are circulated and spaced apart; and a second cylindrical tube extending along an axis. A second header part in which the heat transfer tube is connected to the internal space in a state of communication, a second header inner partition plate that divides the internal space of the second header part into two regions, and a first end of the first header part And the second end opposite to the first end is connected to the outer peripheral surface of the second header portion and the inner space of the second header portion. And the second end opening is in contact with the second header inner partition plate. Opening of the second end comprises a connection tube having a connection pipe main body being disposed across the two regions partitioned by the second header partitioning plate.

According to such a heat exchanger, the refrigerant introduced into the connecting pipe body from the first header portion has the opening at the second end of the connecting pipe body straddling two regions in the second header portion. Will be introduced in each of these two areas. Therefore, since there is only one connection point between the connection pipe, the first header part, and the second header part, handling of the connection pipe is facilitated. In addition, the area occupied by the connection pipe can be made smaller than when the connection pipe is branched. Therefore, a wide effective area for heat exchange with air in the heat exchanger can be secured.
In addition, the refrigerant introduced from the first end of the connecting pipe main body and introduced from the second end into the two regions of the second header portion flows through the same path in the connecting pipe main body. Therefore, the deviation of the gas-liquid ratio of the refrigerant introduced into the two regions can be reduced.

  In the heat exchanger, the second header inner partition plate has a plate shape extending along a plane perpendicular to the axis of the second header portion, and one of the two regions is the first region. A first space partitioned on one side in the axial direction with the two header inner partition plates as a boundary, wherein the other of the two regions is on the other side in the axial direction with the second header inner partition plate as a boundary A partitioned second space is preferable.

  Thereby, the gas-liquid ratio of the refrigerant introduced into each of the first space and the second space divided in the axial direction of the second header portion can be made uniform.

  In the heat exchanger, the second header inner partition plate has a plate shape extending along a plane including the axis line in the second header portion, and a vertical partition portion with which the opening at the second end of the connection pipe contacts. A first horizontal partition that forms a plate shape extending from one edge of the vertical partition to one side in a direction orthogonal to the plate surface of the vertical partition, and the vertical partition A second horizontal partition that forms a plate shape extending from the edge on the other side in the axial direction toward only the other side in the direction orthogonal to the plate surface of the vertical partition, and the two regions One of them is a first space defined on one side in the axial direction of the first horizontal partition and the second horizontal partition, and the other of the two regions is the first horizontal partition. And the 2nd space divided by the axial direction other side of the said 2nd horizontal partition part may be sufficient.

  This also makes it possible to make the gas-liquid ratio of the refrigerant introduced into each of the first space and the second space partitioned by the second header inner partition plate uniform.

  In the heat exchanger, in the space in the second header portion in a cross-sectional view orthogonal to the axis, the outflow side region to which each second heat transfer tube is connected and the inflow in which the second end of the connection tube is connected A vertical partition that divides into a side region, and a horizontal partition that partitions the outflow side region into a first outflow side space and a second outflow side space arranged side by side in the axial direction, The two header inner partition plates extend in a plane including the axis so as to partition the inflow side region into a first chamber and a second chamber adjacent to each other in the circumferential direction of the header portion in a horizontal sectional view. A first through hole that communicates the first chamber and the first outflow side space is formed in a portion of the vertical partition that faces the first chamber, and the first partition in the vertical partition is The portion facing the two chambers communicates the second chamber and the region above the second outflow side space. To the second through hole is formed, wherein one of the two areas a said first chamber, one may be the second chamber of said two regions.

  Thereby, the gas-liquid ratio of the refrigerant introduced into each of the first chamber and the second chamber divided in the circumferential direction by the second header inner partition plate can be made uniform.

  In the heat exchanger, the connection pipe extends from the second header inner partition plate so as to be continuous in the connection pipe main body, and a portion including at least the second end in the connection pipe main body is provided with the second pipe. It is preferable to further have a dividing portion that divides the first flow path that communicates with only one of the two areas and the second flow path that communicates with only the other area.

  Here, the refrigerant introduced into the connecting pipe body may be separated into a gas phase component and a liquid phase component in the course of flowing through the connecting tube body. On the other hand, by dividing the inside of the connecting pipe main body into the first flow path and the second flow path by the dividing portion, the bias of the gas-liquid ratio of the refrigerant introduced into the two regions on the second end side is reduced. Can do.

  In the heat exchanger, the connection pipe body includes a first pipe portion extending from the first header portion to a radially outer side of the first header portion, and a radially outer side of the second header portion from the second header portion. A second pipe part extending to the first pipe part and a connecting pipe part extending to bend with respect to the first pipe part and the second pipe part so as to connect the first pipe part and the second pipe part. It is preferable that the part extends continuously from the second end to the middle of the first pipe part through the second pipe part and the connecting pipe part.

Here, in the bent portion between the first tube portion and the connecting tube portion, and the bent portion between the connecting tube portion and the second tube portion, a liquid phase refrigerant having a large specific gravity is formed on the outside of the bend by centrifugal force. It may be unevenly distributed. In this case, the unevenly distributed refrigerant is introduced into one of the two regions of the second header portion, resulting in a decrease in performance as a heat exchanger.
In contrast, according to the present invention, since the connecting pipe split part extends to the first header side portion rather than the bent part between the first pipe part and the connecting pipe part, The amount of refrigerant introduced into the two regions of the second header portion is determined before this. Thereby, the gas-liquid ratio of the refrigerant introduced into these two regions can be made uniform.

  In the heat exchanger, it is preferable that the dividing portion extends from the second end to the first end.

  Thus, when the refrigerant is introduced from the first header portion into the connection pipe, the amount of refrigerant flowing through the first flow path and the second flow path in the connection pipe is determined. Furthermore, since the first flow path and the second flow path are connected to the same portion of the first header, refrigerants having the same gas-liquid ratio are respectively introduced. As a result, the gas-liquid ratio of the refrigerant introduced into the two regions of the second header portion can be made even more uniform.

  In the heat exchanger, the first header has a cylindrical shape extending along the axis on one side in the axial direction of the second header, and the first pipe of the connection pipe, the first The two pipe parts and the connecting pipe part may extend on a virtual plane including the axis.

  Even in such a structure of the connecting pipe, the difference in the gas-liquid ratio between the first flow path and the second flow path can be reduced by the presence of the dividing portion in the connecting pipe.

  In the heat exchanger, the first flow path and the second flow path may be adjacent to each other in the vertical direction on the first end side of the connection pipe body.

  Even in this case, since the refrigerant having a near gas-liquid ratio is introduced into the first channel and the second channel, the gas-liquid ratio of the refrigerant introduced into the two regions in the second header can be made uniform. it can.

  The first channel and the second channel may be adjacent to each other in the horizontal direction on the first end side of the connection pipe body.

  Here, the refrigerant in the liquid phase is likely to gather downward due to gravity, and the refrigerant in the gas phase is likely to gather upward. Therefore, the gas-liquid ratio of the refrigerant may vary depending on the vertical direction even in the first header portion. Even in this case, since the first channel and the second channel are adjacent to each other in the horizontal direction, the same gas-liquid ratio refrigerant is introduced into the first channel and the second channel. Therefore, the gas-liquid ratio of the refrigerant introduced into the two regions in the second header can be made uniform.

  In the heat exchanger, each of the first flow path and the second flow path has a plurality of small flow paths arranged in parallel in a direction adjacent to the first flow path and the second flow path. It is preferable that the tube has a flat tubular shape whose longitudinal direction is the parallel direction of the small flow paths.

  Thereby, compared with the case where the cross section of a connection pipe is made circular, for example, the curvature radius in the bending part of this connection pipe can be made small. Therefore, by reducing the volume occupied by the connecting pipe, it is possible to secure a wide effective area for heat exchange with the air as the heat exchanger.

  In the heat exchanger, flow path cross-sectional areas of the first flow path and the second flow path may be different from each other.

  When the heat exchange efficiency of the second heat transfer tube connected to each of the two regions of the second header portion is different, according to this, by changing the flow path cross-sectional area of the first flow path, the second flow path, The heat exchange efficiency as the whole heat exchanger can be improved.

  In the heat exchanger, the second header inner partition plate is formed with a notch that is recessed from the radially outer side to the inner side of the second header part, and the second end of the connection pipe body is the cut. You may fit in the notch.

  As a result, the connection pipe can be easily positioned and the workability can be improved.

  In the heat exchanger, the connection pipe is formed with a cut portion extending along the divided portion from the second end, and the cut portion and the second header inner partition plate are fitted to each other. Good.

  Also by this, the connection pipe can be easily positioned and the workability can be improved.

  In the heat exchanger, the first header portion includes a header body having a cylindrical shape centered on the axis, and a main partition plate that divides the header body in the axial direction. The second header portion may be a portion on the other side in the axial direction of the main partition plate in the header, and the axial direction may be a vertical direction.

  By forming the first header part and the second header part through the main partition plate in one header, a heat exchanger having these first header part and second header part can be easily configured.

  An air conditioner according to a second aspect of the present invention includes any one of the above heat exchangers.

  Thereby, the fall of heat exchange performance can be suppressed and an air conditioner with high efficiency can be provided.

  According to the heat exchanger and the air conditioner of the present invention, efficiency reduction can be suppressed.

1 is an overall configuration diagram of an air conditioner according to a first embodiment of the present invention. It is a longitudinal cross-sectional view of the heat exchanger which concerns on 1st embodiment of this invention. It is a perspective view of the heat exchanger which concerns on 1st embodiment of this invention. It is sectional drawing of (a) 1st pipe part and (b) 2nd pipe part of the connection pipe of the heat exchanger which concerns on 1st embodiment of this invention. It is a longitudinal cross-sectional view of the heat exchanger which concerns on the 1st modification of 1st embodiment of this invention. It is a longitudinal cross-sectional view of the heat exchanger which concerns on the 2nd modification of 1st embodiment of this invention. It is a horizontal sectional view of the 2nd header part of the heat exchanger concerning the 3rd modification of a first embodiment of the present invention. It is sectional drawing of the (a) 1st pipe part of the connection pipe of the heat exchanger which concerns on the 4th modification of 1st embodiment of this invention, and the (b) 2nd pipe part. It is a perspective view of the heat exchanger which concerns on 2nd embodiment of this invention. It is the figure which looked at the 2nd header part of the heat exchanger which concerns on 2nd embodiment of this invention from the connection direction of the connecting pipe. It is sectional drawing of the connecting pipe of the heat exchanger which concerns on the 1st modification of 2nd embodiment of this invention. It is sectional drawing of the connecting pipe of the heat exchanger which concerns on the 2nd modification of 2nd embodiment of this invention. It is a perspective view of the connection pipe of the heat exchanger which concerns on the 3rd modification of 2nd embodiment of this invention. It is sectional drawing of the connecting pipe of the heat exchanger which concerns on the 4th modification of 2nd embodiment of this invention. It is a perspective view of the 2nd header part of the heat exchanger which concerns on 3rd embodiment of this invention. It is a horizontal sectional view of the 2nd header part of the heat exchanger concerning a third embodiment of the present invention.

Hereinafter, the air conditioner 1 provided with the heat exchanger 10 which concerns on 1st embodiment of this invention is demonstrated with reference to FIGS.
As shown in FIG. 1, the air conditioner 1 includes a compressor 2, an indoor heat exchanger 3 (heat exchanger 10), an expansion valve 4, an outdoor heat exchanger 5 (heat exchanger 10), a four-way valve 6, and The pipe 7 for connecting them is provided, and a refrigerant circuit composed of these is constituted.

The compressor 2 compresses the refrigerant and supplies the compressed refrigerant to the refrigerant circuit.
The indoor heat exchanger 3 performs heat exchange between the refrigerant and the indoor air. The indoor heat exchanger 3 is used as an evaporator during cooling operation and absorbs heat from the room, and is used as a condenser during heating operation and dissipates heat to the room.
The expansion valve 4 reduces the pressure by expanding the high-pressure refrigerant liquefied by exchanging heat with the condenser.

The outdoor heat exchanger 5 performs heat exchange between the refrigerant and the outdoor air. During cooling operation, it is used as a condenser and dissipates heat to the outside, and during heating operation, it is used as an evaporator and absorbs heat from the outside.
The four-way valve 6 switches the direction in which the refrigerant flows between the heating operation and the cooling operation. Accordingly, during the cooling operation, the refrigerant circulates in the order of the compressor 2, the outdoor heat exchanger 5, the expansion valve 4, and the indoor heat exchanger 3. On the other hand, during the heating operation, the refrigerant circulates in the order of the compressor 2, the indoor heat exchanger 3, the expansion valve 4, and the outdoor heat exchanger 5.

Next, the heat exchanger 10 used as the indoor heat exchanger 3 and the outdoor heat exchanger 5 will be described with reference to FIGS.
The heat exchanger 10 includes a plurality of heat transfer tubes 20, a plurality of fins 28, a pair of headers 30, and a connection tube 61.

The heat transfer tube 20 is a tubular member extending linearly in the horizontal direction, and a flow path through which the refrigerant flows is formed. A plurality of such heat transfer tubes 20 are arranged at intervals in the vertical direction, and are arranged in parallel to each other.
In this embodiment, each heat transfer tube 20 has a flat tubular shape, and a plurality of flow paths arranged in parallel in the horizontal direction perpendicular to the extending direction of the heat transfer tube 20 are formed inside the heat transfer tube 20. ing. The plurality of flow paths are arranged in parallel to each other. Thereby, the outer shape of the cross section orthogonal to the extending direction of the heat transfer tube 20 is a flat shape with the horizontal direction orthogonal to the extending direction of the heat transfer tube 20 as the longitudinal direction.

  The fins 28 are respectively arranged between the heat transfer tubes 20 arranged as described above. In the present embodiment, the fins 28 are alternately arranged on the heat transfer tubes 20 adjacent in the vertical direction as they extend in the extending direction of the heat transfer tubes 20. It extends in a so-called corrugated shape extending so as to come into contact. In addition, the shape of the fin 28 is not limited to this, and may be any shape as long as it is provided so as to protrude from the outer peripheral surface of the heat transfer tube 20.

  The pair of headers 30 are provided so as to sandwich the heat transfer tubes 20 at both ends of the plurality of heat transfer tubes 20. One of the pair of headers 30 is an inlet / outlet header 40 that serves as an inlet / outlet of the refrigerant into the heat exchanger 10 from the outside, and the other is a return header 50 for returning the refrigerant in the heat exchanger 10. It is said that.

The entrance-and-exit header 40 is a cylindrical member extending in the vertical direction. The upper and lower ends are closed, and the interior is partitioned into two upper and lower areas by a partition plate 41. The lower area partitioned by the partition plate 41 is a lower entry / exit area 42, and the upper area is an upper entry / exit area 43. The lower entrance / exit area 42 and the upper entrance / exit area 43 are not in communication with each other in the entrance / exit header 40. The lower entry / exit area 42 and the upper entry / exit area 43 are connected to the pipes 7 constituting the refrigerant circuit.
Here, among the plurality of heat transfer tubes 20, the heat transfer tube 20 connected in communication with the lower access region 42 is the first heat transfer tube 21, and is connected in communication with the upper input / output region 43. The heat transfer tube 20 is a second heat transfer tube 23.

The folded-back header 50 includes a header body 51, a main partition plate 58, and a second header inner partition plate 60.
The header main body 51 is a cylindrical member extending about the axis O, and the upper end and the lower end are closed. The header body 51 of the present embodiment extends in a state where the axis O is aligned in the vertical direction. That is, the vertical direction is the axis O direction.
The main partition plate 58 is provided in the header body 51, and divides the space in the header body 51 into upper and lower areas.

A portion including a lower region (one side in the direction of the axis O) partitioned by the main partition plate 58 is a first header portion 52. That is, the lower area partitioned by the main partition plate 58 is an internal space of the first header portion 52.
A portion including an upper region (the other side in the axis O direction) partitioned by the main partition plate 58 is a second header portion 53. That is, the upper region partitioned by the main partition plate 58 is an internal space of the second header portion 53.

  As described above, in the present embodiment, the header main body 51 is partitioned by the main partition plate 58, whereby the first header portion 52 and the second header portion 53 each having a space therein are formed in the folded-back header 50. ing. In other words, the first header portion 52 and the second header portion 53 constitute the folded-back header 50.

  The second header inner partition plate 60 further divides the internal space of the second header portion 53 into two regions. The second header inner partition plate 60 of the present embodiment has a plate shape extending along a horizontal plane (a plane orthogonal to the axis O). Thus, the second header inner partition plate 60 partitions the internal space of the second header portion 53 into a lower region and an upper region. A lower region in the second header portion 53 with the second header inner partition plate 60 as a boundary is defined as a lower space 54 (first space), and an upper region with the second header inner partition plate 60 as a boundary is an upper side. A space 55 (second space) is defined.

  The plurality of first heat transfer tubes 21 are connected to the first header portion 52 so as to communicate with the inside of the first header portion 52, respectively. The plurality of first heat transfer tubes 21 constitute a first tube group 22. In other words, the heat transfer tube 20 connected to the first header portion 52 is the first heat transfer tube 21.

The second heat transfer tubes 23 are connected to the second header portion 53 so as to communicate with the lower space 54 and the upper space 55 of the second header portion 53, respectively.
That is, the heat transfer tube 20 connected to the second header portion 53 is the second heat transfer tube 23. Of the second heat transfer tubes 23, the lower second tube group 25 is configured by a plurality of second heat transfer tubes 23 connected to the lower space 54 in a communicating state. In addition, the upper second tube group 26 is configured by a plurality of second heat transfer tubes 23 connected in communication with the upper space 55.

The connection pipe 61 communicates the internal space of the first header portion 52 with the lower space 54 and the upper space 55 in the second header portion 53.
The connection pipe 61 has a connection pipe main body 62 and a dividing portion 70.

The connection pipe main body 62 is a tubular member, and includes a first pipe part 65, a second pipe part 66, and a connection pipe part 67.
The first pipe portion 65 is connected to the first header portion 52 from the outer peripheral side. That is, the first pipe portion 65 is a tubular member extending in the horizontal direction (a direction orthogonal to the axis O), and one end of the first pipe portion 65 is in the header main body 51 so as to communicate with the inside of the first header portion 52. The first header portion 52 is connected to the formation region. This 1st pipe part 65 is connected to the part on the opposite side on both sides of the axis line O of the location where the heat exchanger tube 20 in the circumferential position of the 1st header part 52 (header main body 51) was connected.

  The second pipe portion 66 is connected to the second header portion 53 from the outer peripheral side. That is, the second pipe portion 66 is a tubular member extending in the horizontal direction, and one end of the second pipe portion 66 is formed in the header main body 51 so as to communicate with the inside of the second header portion 53. It is connected to the. This 2nd pipe part 66 is connected to the part similar to the connection place of the 1st pipe part 65 in the circumferential direction position of the 2nd header part 53 (header main body 51).

The connecting pipe part 67 connects the first pipe part 65 and the second pipe part 66 in the vertical direction. That is, the connecting pipe part 67 is a tubular member extending in the up-down direction, and the lower end is connected to the first pipe part 65 with the inside thereof in communication. Further, the upper ends are connected to the second pipe portion 66 with the insides thereof in communication with each other. Thus, a first bent portion 68 is formed at the connection portion between the connecting pipe portion 67 and the first pipe portion 65, in which the flow path in the connection pipe 61 is bent in the vertical direction from the horizontal direction. A connecting portion between the connecting pipe portion 67 and the second pipe portion 66 is configured with a second bent portion 69 in which the flow path in the connecting pipe 61 is bent in the vertical direction from the horizontal direction.
In the connection pipe main body 62 configured as described above, the first pipe part 65, the second pipe part 66, and the connection pipe part 67 extend on a virtual plane including the axis O.

  Here, an end portion of the connection pipe main body 62 connected to the first header portion 52 of the first pipe portion 65 is a first end 63 of the connection pipe main body 62. Further, the end of the connection pipe main body 62 connected to the second header part 53 of the second pipe part 66 is the second end 64 of the connection pipe main body 62.

  The vertical direction position of the second end 64 of the connecting pipe main body 62 is the same position as the second header inner partition plate 60 that divides the second header portion 53 into two upper and lower regions. Thereby, the opening of the second end 64 of the connecting pipe main body 62 is in contact with the second header inner partition plate 60. Further, the thickness dimension (vertical dimension) of the second header inner partition plate 60 is set to be smaller than the vertical dimension of the opening of the second pipe part 66 of the connection pipe main body 62. The second header inner partition plate 60 is installed in the vertical range of the opening of the second pipe portion 66. As a result, the opening of the second end 64 is disposed across both the lower space 54 and the upper space 55, and the second pipe portion 66 of the connecting pipe main body 62 is inside the second header portion 53. The lower space 54 and the upper space 55 are in communication with each other.

  The dividing unit 70 divides the inside of the connecting pipe main body 62 into a first channel 71 and a second channel 72. In the present embodiment, the dividing portion 70 is connected to the first header portion 52 of the first tube portion 65 inside the connection tube main body 62 via the connecting tube portion 67 and connected to the second tube portion 66. It is formed over the connection portion with the two header portions 53. As a result, the first flow path 71 and the second flow path 72 are formed in the entire region extending from the first end 63 and the second end 64 in the connecting pipe main body 62.

Moreover, the division | segmentation part 70 is extended in plate shape along the horizontal surface in each in the 1st pipe part 65 and the 2nd pipe part 66, as shown to Fig.5 (a) and FIG.5 (b). Accordingly, the inside of the first pipe portion 65 and the second pipe portion 66 is divided into two upper and lower flow paths.
Further, the dividing portion 70 extends along a vertical plane perpendicular to the plane including the axis O of the header main body 51 in the connecting pipe portion 67, whereby the inside of the connecting pipe portion 67 is connected to the header main body 51. The flow path is divided into a flow path on the adjacent side and a flow path on the side separated from the header body 51.

  In the present embodiment, the first flow path 71 includes a lower flow path in the first pipe portion 65, a flow path on the side separated from the header body 51 in the connection pipe portion 67, and the second pipe portion 66. It is comprised by the upper flow path. On the other hand, the second flow path 72 includes an upper flow path in the first pipe portion 65, a flow path on the side close to the header body 51 in the connection pipe portion 67, and a lower flow path in the second pipe portion 66. It is comprised by the flow path. Thereby, in this embodiment, the 1st flow path 71 and the 2nd flow path 72 are adjacent to the up-down direction also in the opening part of both the 1st end 63 and the 2nd end 64 of the connection pipe 61. FIG.

  The end of the dividing portion 70 on the second end 64 side is in contact with the second header inner partition plate 60 in the second header portion 53, whereby the dividing portion 70 is in contact with the second header inner partition plate 60. To the inside of the connecting pipe main body 62. For this reason, the first flow path 71 of the connection pipe 61 communicates only with the upper space 55 in the second header portion 53. On the other hand, the second flow path 72 of the connection pipe 61 communicates only with the lower space 54 in the second header portion 53.

Next, operations and effects when the heat exchanger 10 is used as an evaporator will be described.
When the heat exchanger 10 is the indoor heat exchanger 3, it is used as an evaporator during the cooling operation of the air conditioner 1, and when the outdoor heat exchanger 5 is used, it evaporates during the heating operation of the air conditioner 1. It will be used as a container.

  When the heat exchanger 10 is used as an evaporator, a gas-liquid two-phase refrigerant with a large liquid phase is supplied from the pipe 7 to the lower inlet / outlet region 42 of the inlet / outlet header 40 shown in FIG. This refrigerant is distributed and supplied into the plurality of first heat transfer tubes 21 in the lower entrance / exit region 42, and exchanges heat with the external atmosphere of the first heat transfer tubes 21 in the process of flowing through the first heat transfer tubes 21. Evaporation is encouraged. As a result, a part of the refrigerant supplied from the first heat transfer tube 21 into the first header portion 52 of the folded-back header 50 changes from the liquid phase to the gas phase, and the gas phase is higher than the refrigerant in the lower entrance / exit region 42. It becomes a gas-liquid two-phase refrigerant with an increased ratio.

  Then, the refrigerant in the first header portion 52 is introduced into the second header portion 53 via the connection pipe 61. More specifically, a refrigerant is introduced into each of the first flow path 71 and the second flow path 72 in the connection pipe 61 from the opening of the first end 63 in the connection pipe 61, and the refrigerant flowing through the first flow path 71 is The first flow path 71 is introduced into the upper space 55 of the second header portion 53 that communicates. On the other hand, the refrigerant flowing through the second flow path 72 is introduced into the upper space 55 of the second header portion 53 with which the second flow path 72 communicates.

  Here, among the gas-liquid two-phase refrigerant supplied into the first header portion 52, a refrigerant having a large liquid phase content and a high density gathers under the first header portion 52 due to gravity, and has a large gas phase content and a high density. A small refrigerant collects in the upper part of the first header part 52. That is, in the first header portion 52, the gas-liquid ratio of the refrigerant differs at the vertical position.

  Here, in the present embodiment, the first flow path 71 and the second flow path 72 that communicate with the lower space 54 and the upper space 55 of the second header portion 53 are formed in the entire area of the connection pipe 61. Only the first end 63 of the connecting pipe main body 62 in which the one flow path 71 and the second flow path 72 are arranged in parallel with each other is connected to the first header portion 52. Therefore, the first channel 71 and the second channel 72 are supplied with substantially the same coolant in the vertical direction. Therefore, since the refrigerant having substantially the same gas-liquid ratio is introduced into the lower space 54 and the upper space 55 through the first flow path 71 and the second flow path 72, the lower space 54 and the upper space 55 are introduced. The gas-liquid ratio of the refrigerant in the space 55 is close.

  Thereafter, the refrigerant in the lower space 54 and the upper space 55 of the second header portion 53 is divided into a plurality of second heat transfer tubes 23 connected thereto, and flows through the second heat transfer tubes 23. Then, the refrigerant is urged to evaporate again by exchanging heat with the external atmosphere of the second heat transfer tube 23 in the process of flowing through the second heat transfer tube 23. As a result, the liquid phase remaining in the refrigerant changes into a gas phase in the second heat transfer tube 23, and the gas phase refrigerant is supplied to the upper entrance / exit region 43 of the inlet / outlet header 40. Then, the refrigerant is introduced into the pipe 7 from the upper entrance / exit area 43 and circulates in the refrigerant circuit.

  As described above, in the present embodiment, the first flow path 71 and the second flow path 72 are formed over the entire extending direction in the connection pipe 61, and the first flow path 71 and the second flow path are formed at the first end 63. 72 is connected to substantially the same vertical position of the first header portion 52. For this reason, substantially the same gas-liquid ratio refrigerant is introduced into the first channel 71 and the second channel 72. Further, the refrigerant introduced into the first flow path 71 and the second flow path 72 is directly introduced into the lower space 54 and the upper space 55 of the second header portion 53 without being branched. That is, when the refrigerant is introduced into the connection pipe 61 from the first header portion 52, the gas-liquid ratio of the refrigerant introduced into the lower space 54 and the upper space 55 is determined. Therefore, the gas-liquid ratio of the refrigerant introduced into the lower space 54 and the upper space 55 can be made uniform, and then efficient heat exchange can be performed in the second heat transfer tube 23 into which the refrigerant is introduced. It becomes possible, and the performance fall of the heat exchanger 10 can be suppressed.

  Further, if the first header portion 52 and the lower space 54 and the upper space 55 of the second header portion 53 are connected by a flow path that branches in the middle, the two flow rates particularly when the flow rate of the refrigerant changes. The gas-liquid ratio of the refrigerant flowing into the space may also change greatly. In the present embodiment, as described above, the refrigerant introduced from the first header portion 52 into the first flow path 71 and the second flow path 72 is directly introduced into the lower space 54 and the upper space 55 of the second header section 53. Therefore, even if the flow rate of the refrigerant changes, the gas-liquid ratio of the refrigerant introduced into the lower space 54 and the upper space 55 does not greatly differ.

Moreover, in this embodiment, the connection location with respect to the 1st header part 52 and the 2nd header part 53 of the connection pipe 61 becomes only one place each. As a result, for example, the connecting pipe 61 can be easily routed as compared to the case where a plurality of flow paths are used or the flow paths are branched.
Moreover, the area | region which the connection pipe 61 occupies can be made small by forming the several flow path (the 1st flow path 71, the 2nd flow path 72) in the single connection pipe 61. FIG. Here, when the size of the heat exchanger 10 as a whole is predetermined in design, the effective area for heat exchange with air can be increased by the amount that the connecting pipe 61 is made compact. Therefore, a more efficient heat exchanger 10 can be configured.

As a first modification of the first embodiment, for example, as shown in FIG. 5, the connection pipe 61 may not have the dividing portion 70. In this case, the connecting pipe 61 is composed only of the connecting pipe main body 62.
As described above, even if the connection pipe 61 does not have the dividing portion 70, the connection pipe 61 is introduced from the first end 63 of the connection pipe main body 62 and is introduced from the second end 64 to the two regions of the second header portion 53. The refrigerant flowing through the same path in the connecting pipe main body 62 is introduced into the lower space 54 and the upper space 55 of the second header portion 53. Therefore, the deviation of the gas-liquid ratio of the refrigerant introduced into the two regions can be reduced.

Further, as a second modification of the first embodiment, for example, as shown in FIG. 6, the formation range of the dividing portion 70 may be different from that of the first embodiment.
In the present modification, the split portion 70 of the connection pipe 61 is provided in the middle of the first pipe portion 65 from the second end 64 of the connection pipe main body 62 via the second pipe portion 66 and the connecting pipe portion 67, that is, the first pipe portion 65. It is formed so as to extend to the front of the one end 63.

  Here, in the case of the connecting pipe 61 having a configuration that does not include the dividing portion 70 as in the first modified example, depending on the flow rate and flow rate of the refrigerant, the first bent portion 68 and the second bent portion 69 may cause the refrigerant gas phase. And the liquid phase may be separated. That is, due to the centrifugal force received when the refrigerant passes through the first bent portion 68 of the connecting pipe main body 62, the liquid phase component having a higher density is unevenly distributed outside the bent portion. In this case, the distribution of the liquid-phase refrigerant is formed in the circumferential direction in the connecting pipe main body 62, and as a result, the refrigerant having greatly different gas-liquid ratios in the lower space 54 and the upper space 55 of the second header portion 53. Sometimes introduced.

  On the other hand, in the second modified example, since the dividing portion 70 extends from the first bent portion 68 to the first end 63 side of the connecting pipe 61, the refrigerant introduced from the first end 63 of the connecting pipe main body 62. However, the gas is separated from the first flow path 71 and the second flow path 72 before the gas-liquid separation at the first bent portion 68. Therefore, the gas-liquid ratio of the refrigerant flowing between the first flow path 71 and the second flow path 72 is not greatly different. Therefore, like the first embodiment, the performance deterioration of the heat exchanger 10 can be suppressed.

  Furthermore, as a third modification of the first embodiment, for example, as shown in FIG. 7, the connection region with the connection pipe 61 in the second header inner partition plate 60 is moved from the outer peripheral side of the second header inner partition plate 60. A configuration in which the notched portion 75 that is recessed is provided and the second end 64 of the connecting pipe 61 that has entered the inside of the second header portion 53 is fitted into the notched portion 75 may be adopted.

The second header inner partition plate 60 is formed with the notch 75 before being mounted in the header 30. Then, a notch for inserting the second header inner partition plate 60 is provided in the header 30, and the second header inner partition plate 60 is inserted into the header 30 from the outer peripheral side of the header 30. Then, the second end 64 of the connection pipe 61 is inserted into the header 30 from the connection hole of the connection pipe 61 formed in the header 30, and the second end 64 is inserted into the cut portion of the second header inner partition plate 60. Fit. After assembling in this way, the header 30, the second header inner partition plate 60, and the connecting pipe 61 are brazed together. The connecting pipe 61 is preferably made of an aluminum alloy, and the second header partition plate 60 is preferably made of a clad material formed by bonding a brazing material.
According to the third modified example, since the connection pipe 61 can be easily positioned when the heat exchanger 10 is manufactured, it is possible to improve the workability.

As a fourth modification of the first embodiment, for example, as shown in FIG. 8, the first flow path 71 and the second flow path 72 in the connection pipe 61 are arranged in parallel in the vertical direction in the second pipe portion 66. On the other hand, the first pipe portion 65 may be arranged in parallel in the horizontal direction.
That is, in the fourth modification example, the division part 70 in the first pipe part 65 has a plate shape extending in the vertical direction, and thereby the inside of the first pipe part 65 is arranged in parallel in the horizontal direction. The first flow path 71 and the second flow path 72 are divided.

  According to such a connecting pipe 61, since the first flow path 71 and the second flow path 72 are arranged in parallel in the opening portion of the first end 63, the first flow path 71 and the second flow path at the first end 63 are arranged. The vertical direction position of the two flow paths 72 is the same. Therefore, similar refrigerants having a gas-liquid ratio are introduced into the first channel 71 and the second channel 72, respectively. Therefore, the first flow path 71 and the second flow path 72 are further introduced into the lower space 54 and the upper space 55 of the second header portion 53 as compared with the case where the first flow path 71 and the second flow path 72 are arranged in the vertical direction at the first end 63. The gas-liquid ratio of the refrigerant can be made uniform.

In the fourth modified example, at least the first channel 71 and the second channel 72 may be arranged in parallel in the horizontal direction at the first end 63. The first flow path 71 and the second flow path 72 need only be arranged in the horizontal direction at least at the second end 64. Between the first end 63 and the second end 64, the first flow path 71 and the second flow path 72 are arranged. The two flow paths 72 may be in any juxtaposed state. That is, the division part 70 may be formed to be twisted at at least one of the first pipe part 65, the second pipe part 66, and the connection pipe part 67.
Furthermore, the dividing part 70 of the fourth modification is applied to the second modification, and the first flow path 71 and the first flow path 71 are formed at the end of the dividing part 70 located in the middle of the extending direction of the first pipe part 65. The two flow paths 72 may be juxtaposed in the horizontal direction.

Next, the heat exchanger 80 which concerns on 2nd embodiment of this invention is demonstrated with reference to FIG.9 and FIG.10. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.
The heat exchanger 80 of the second embodiment is different from the first embodiment in the structure of the second header inner partition plate 81 and the connection pipe 90.

The second header inner partition plate 81 of the second embodiment includes a vertical partition 82, a first horizontal partition 83, and a second horizontal partition 84.
The vertical partition 82 is a plate-like member extending along a plane including the axis O, and the second header portion 53 has a diameter direction (heat transfer tube) in a partial range in the vertical direction in the second header portion 53. 20, the extending direction of the first pipe 945 and the second pipe portion 95). In the present embodiment, the vertical partition 82 extends in the diametrical direction over the side to which the second heat transfer tube 23 is connected and the side to which the connection tube 90 is connected in the second header portion 53. The vertical partition 82 has a rectangular plate shape, and its longitudinal edge is formed as a lower edge and an upper edge of the vertical partition 82 extending in the diameter direction. An edge portion in the hand direction is in contact with the inner peripheral surface of the second header portion 53 and extends in the vertical direction.

  The first horizontal partition 83 extends from the lower edge of the vertical partition 82 toward one side (left side in FIG. 10) in the direction orthogonal to the pair of plate surfaces of the vertical partition 82. The vertical partition 82 is a semicircular plate member in plan view, and the semicircular linear edge forms an intersecting ridge with the lower edge of the vertical partition 82, The arc-shaped edge is in contact with a region in the circumferential direction half of the inner peripheral surface of the second header portion 53.

  The second horizontal partition 84 extends from the upper edge of the vertical partition 82 toward the other side (the right side in FIG. 10) in the direction orthogonal to the pair of plate surfaces of the vertical partition 82. The vertical partition 82 is a semicircular plate member in plan view, and the semicircular linear edge forms an intersecting ridge line with the upper edge of the vertical partition 82, and has an arc shape. Is in contact with a region in the circumferential direction half of the inner peripheral surface of the second header portion 53.

  With such a second header inner partition plate 81, the second header portion 53 is partitioned into two spaces. Of the two spaces, the space below the first horizontal partition 83 and the second horizontal partition 84, that is, the lower surface of the first horizontal partition 83, the lower surface of the second horizontal partition 84, and the other of the vertical partition 82. A space in contact with the side (right side in FIG. 10) is a lower space 86. Of the two spaces, the space above the first horizontal partition 83 and the second horizontal partition 84, that is, the upper surface of the first horizontal partition 83, the upper surface of the second horizontal partition 84, and the vertical partition 82. A space in contact with the surface on one side (the left side in FIG. 10) is an upper space 87.

The connecting pipe 90 has a connecting pipe main body 91 and a dividing part 100.
As in the first embodiment, the connecting pipe main body 91 is a tubular member that communicates the inside of the first header portion 52 and the inside of the second header portion 53, and the first end 92 is the outer peripheral surface of the first header portion 52. The second end 93 is connected to the outer peripheral surface of the second header portion 53.

The outer diameter of the cross section perpendicular to the extending direction of the connecting pipe main body 91 is a flat shape having one direction as a longitudinal direction. In this embodiment, it is made into the flat shape which makes a horizontal direction a longitudinal direction. As in the first embodiment, the connection pipe body 91 is composed of three tubular members, a first pipe part 94, a second pipe part 95, and a connection pipe part 96. The first pipe part 94 and the connection pipe part A first bent portion 97 is formed between the second pipe portion 95 and the connecting pipe portion 96, and a second bent portion 98 is formed between the second pipe portion 95 and the connecting pipe portion 96.
The first end 92 of the connecting pipe main body 91 is connected to the first header portion 52 in a posture in which the horizontal direction is the longitudinal direction and the vertical direction is the short direction. Similarly to the first end 92, the second end 93 of the connecting pipe main body 91 is connected to the second header portion 53 in a posture in which the horizontal direction is the longitudinal direction and the vertical direction is the short direction.

The vertical position and the circumferential position of the second end 93 of the connecting pipe main body 91 are the same as the vertical partition 82 of the second header inner partition plate 81. As a result, the opening at the second end 93 of the connecting pipe main body 91 is in contact with the vertical partition 82. As a result, the opening of the second end 93 extends over both sides in the direction in which the pair of plate surfaces of the vertical partition 82 face, and the second pipe 95 of the connecting pipe main body 91 is located below the second header 53. The side space 86 and the upper space 87 are in communication with each other.
As described above, in the present embodiment, the second end 93 of the connecting pipe main body 91 is in communication with both spaces so as to straddle the horizontal space between the lower space 86 and the upper space 87 adjacent to each other in the horizontal direction. ing.

The dividing portion 100 is provided in the connecting pipe body 91 so as to divide the inside of the connecting pipe body 91 into two flow paths arranged in parallel in the horizontal direction from the first end 92 to the second end 93. That is, the dividing portion 100 is provided so as to bisect the inside of the connecting pipe main body 91 at the central portion in the longitudinal direction inside the connecting pipe main body 91.
One of the flow paths formed by the dividing part 100 is a first flow path 101 that communicates the inside of the first header part 52 and the lower space 86 of the second header part 53. The other of the flow paths formed by the dividing part 100 is a second flow path 103 that allows the inside of the first header part 52 and the upper space 87 of the second header part 53 to communicate with each other. Each of the first channel 101 and the second channel 103 has a channel cross-sectional shape whose longitudinal direction is the juxtaposed direction, and the second end from the first end 92 in a state where the channel cross-sectional shape is maintained. 93.

  In the heat exchanger 80 of the second embodiment as described above, the refrigerant introduced from the first end 92 of the connecting pipe body 91 into the first flow path 101 and the second flow path 103 is the same as in the first embodiment. It flows through the first flow path 101 and the second flow path 103 and is introduced into the lower space 86 and the upper space 87 of the second header portion 53. Since the connection location of the first flow path 101 and the second flow path 103 to the first header portion 52 is the same vertical position, refrigerants having the same gas-liquid ratio are introduced to each other, while these refrigerants are in the middle. The second header portion 53 is directly introduced into the lower space 86 and the upper space 87 without branching. Therefore, the gas-liquid ratio of the refrigerant in these two spaces can be made uniform, and the performance deterioration as the heat exchanger 80 can be suppressed as in the first embodiment.

  In this embodiment, since the shape of the connecting pipe main body 91 is a flat tubular shape, for example, the first bent portion 97 and the second bent portion 98 are compared with a circular shape having a similar flow path cross-sectional area. The radius of curvature can be reduced. Therefore, by reducing the volume occupied by the connecting pipe 90, it is possible to secure a wide effective area for heat exchange with air as the heat exchanger 80.

  As a second modification of the first embodiment, as shown in FIG. 11, the first flow path 101 and the second flow path 103 in which a part of the flow path having a circular cross section is cut out in a straight line form the straight line. The structure provided so that it might mutually be arranged by the division part 100 which comprises a shape-like part may be sufficient.

As a second modification of the second embodiment, as shown in FIG. 12, the connecting pipe 90 includes a first flow path 101 and a second flow path 103, respectively. A flat tube structure having a plurality of small channels 102 and 104 arranged side by side in the adjacent direction.
As a result, as in the second embodiment, the refrigerant can be introduced from the first header portion 52 into each space of the second header portion 53 via the small flow paths 102 and 103.

  Furthermore, as a third modification of the second embodiment, as shown in FIG. 13, the connection pipe main body 91 and the split part 100 in the connection pipe 90 are connected to the first end 92 side from the second end 93 along the split part 100. The structure may be such that a cut portion 105 is formed extending in a straight line, and the cut portion 105 and the second header inner partition plate 81 are fitted to each other. As a result, the first flow path 101 and the second flow path 103 are not connected to each other, and the first flow path 101 and the second flow path 103 are connected to the lower space 86 and the upper space 87 respectively. The connecting pipe 90 can be easily positioned, and the workability can be improved.

Further, as a fourth modification of the second embodiment, as shown in FIG. 14, the channel cross-sectional areas of the first channel 101 and the second channel 103 may be different from each other. In this modification, the channel cross-sectional area of the second channel 103 is smaller than the channel cross-sectional area of the first channel 101.
For example, the number of the second heat transfer tubes 23 of the lower second tube group 25 connected to the lower space 86 of the second header portion 53 is the second of the upper second tube group 26 connected to the upper space 87. When the number of heat transfer tubes 23 is larger, the cross-sectional area of the first flow path 101 is set larger as described above, and the flow rate of the refrigerant introduced into the lower space 86 is increased, so that the heat exchanger 80 as a whole is obtained. Heat exchange efficiency can be improved.

Further, for example, even when the flow rate of the air blows against the lower second tube group 25 is faster than the flow velocity of the air blows against the upper second tube group 26, the cross-sectional area of the first flow path 101 is set to be large as described above. By increasing the flow rate of the refrigerant introduced into the side space 86, the heat exchange efficiency of the heat exchanger 80 as a whole can be improved.
That is, heat exchange is performed by changing the amount of the refrigerant introduced into the lower space 86 and the upper space 87 according to the heat exchange performance in the second tube group 24 into which the refrigerant is introduced from the lower space 86 and the upper space 87. Efficiency can be improved.

In addition, although the vertical partition part 82 of this embodiment is extended only to the perpendicular direction, it is not limited to this, You may incline with respect to a perpendicular direction and a horizontal direction.
Moreover, although the 1st horizontal partition part 83 and the 2nd horizontal partition part 84 are each extended along only a horizontal surface, they may be inclined a little and may not necessarily be a flat board. .

Next, the heat exchanger 110 according to the third embodiment of the present invention will be described with reference to FIGS. 15 and 16. In the third embodiment, components similar to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.
The heat exchanger 110 of the third embodiment is different from the first embodiment in the structure in the second header portion 53. Although not shown in FIGS. 15 and 16, a first header portion 52 similar to that of the first embodiment is disposed below the second header portion 53. The two header portions 53 are connected to the heat transfer tubes 20 similar to the first embodiment.

  In the second header portion 53 of the third embodiment, a vertical partition plate 111, a horizontal partition plate 116, and a second header inner partition plate 119 are provided.

  The vertical partition plate 111 divides the space in the second header portion 53 into two regions, that is, a region to which each second heat transfer tube 23 is connected and a region to which the connection tube 61 is connected in a horizontal sectional view. Yes. A region to which the second heat transfer tube 23 partitioned by the vertical partition plate 111 is connected is an outflow region 112. A region to which the connection pipe 61 partitioned by the vertical partition plate 111 is connected is an inflow side region 113.

  In the present embodiment, the second header portion 53 has a cylindrical shape extending in the vertical direction, and the internal space is also cylindrical. And the vertical partition 111 is arrange | positioned so that the diameter direction in the horizontal sectional view of the internal space of the cylindrical 2nd header part 53 may be followed. As a result, the inflow side region 113 and the outflow side region 112 each have a semicircular shape in a horizontal sectional view.

  The horizontal partition plate 116 divides the outflow side region 112 into two spaces in the vertical direction. A lower space of the two spaces is a first outflow side space 117. The upper space of the two spaces is a second outflow side space 118. A second heat transfer tube 23 is connected to each of the first outflow side space 117 and the second outflow side space 118. The horizontal partition plate 116 has a semicircular plate shape in plan view.

  The second header inner partition plate 119 is a plate-like member extending in the vertical direction, and is provided in the inflow side region 113 in the second header portion 53. The second header inner partition plate 119 divides the inflow side region 113 into two regions adjacent to each other in the circumferential direction of the second header portion 53 in a horizontal sectional view. Of these two regions, the left region as viewed from the other side in the horizontal direction, which is the connecting direction of the connecting pipe 61, is the first chamber 120, and the right region is the second chamber 121.

  In the present embodiment, the second header inner partition plate 119 is disposed along the radial direction in the horizontal sectional view of the internal space of the cylindrical second header portion 53. In addition, the second header inner partition plate 119 is disposed so as to extend perpendicular to the vertical partition plate 111, whereby the first chamber 120 and the second chamber 121 have the same volume.

  Here, a portion of the vertical partition plate 111 facing the first chamber 120 is formed with a first through-hole 114 that allows the first chamber 120 to communicate with the first outflow side space 117 of the outflow side region 112. . In addition, a second through hole 115 that communicates the second chamber 121 and the second outflow side space 118 of the outflow side region 112 is formed in a portion facing the second chamber 121 in the vertical partition plate 111.

  The first through-hole 114 and the second through-hole 115 are arranged at locations where the vertical positions are different from each other. In the present embodiment, the first through-hole 114 is formed at a location near the lowermost portion of the second header portion 53 and below the vertical partition plate 111. The second through-hole 115 is formed at a location near the uppermost portion of the second header portion 53 on the upper part of the vertical partition plate 111. Further, the vertical positions of the first through hole 114 and the second through hole 115 are different from the vertical position of the connection portion of the connection pipe 61 to the second header portion 53. Note that only one of the first through-hole 114 and the second through-hole 115 may have a different vertical position from the connection location of the connection pipe 61 to the second header portion 53.

  And the connection location with the 2nd header part 53 of the connection pipe main body 62 of the connection pipe 61 is made into the same location as the circumferential direction position in the 2nd header part 53 of the vertical partition plate 111. FIG. Thereby, the connection location to the 2nd header part 53 of the connection pipe main body 62 is arrange | positioned ranging over the 1st chamber 120 and the 2nd chamber 121. As shown in FIG. Therefore, the refrigerant introduced from the connecting pipe main body 62 into the second header portion 53 is introduced into both the first chamber 120 and the second chamber 121. In the present embodiment, the connection portion of the connection pipe main body 62 with the second header portion 53 is a lower portion of the second header portion 53.

  In addition, the division part 70 may be formed in the inside of the connection pipe 61 like 1st embodiment. In this case, of the first flow path 71 and the second flow path 72 defined by the dividing unit 70, the first flow path 71 is in communication with the first chamber 120, and the second flow path 72 is in the second chamber 121. Is in communication.

  Also in the heat exchanger 110 of this embodiment, the refrigerant introduced into the second header portion 53 from the connection pipe 61 is communicated with both the first chamber 120 and the second chamber 121 by the connection pipe main body 62. In the first chamber 120 and the second chamber 121, the substantially same gas-liquid ratio refrigerant is introduced.

  The refrigerant introduced into the first chamber 120 is introduced into the first outflow side space 117 of the outflow side region 112 through the first through hole 114 formed in the lower portion of the second header portion 53. At this time, when the flow rate of the refrigerant is small, the refrigerant is introduced into the lower portion of the outflow side region 112 through the first through hole 114 without being stored in the first chamber 120. On the other hand, when the flow rate of the refrigerant is large, the refrigerant is sequentially introduced into the first outflow side space 117 through the first through hole 114 while the refrigerant is stored in the first chamber 120 to some extent.

  On the other hand, the refrigerant introduced into the second chamber 121 sequentially moves upward in the second chamber 121 as the refrigerant continues to be supplied, and passes through the second through hole 115 formed in the upper portion of the second header portion 53. Then, it is introduced into the second outflow side space 118 of the outflow side region 112. In other words, the connection portion between the connection pipe 61 and the second header portion 53 is disposed in the lower portion of the second header portion 53, whereas the second penetration that communicates the second chamber 121 and the outflow side region 112. Since the hole 115 is arranged at the upper part of the second header portion 53, the refrigerant introduced into the second chamber 121 is introduced into the upper part of the outflow side region 112 after moving through the second chamber 121 from below to above. The In this way, the refrigerant moving path is lengthened, so that the liquid phase and gas phase components in the refrigerant can be mixed. The refrigerant in the gas-liquid two-phase state introduced from the first chamber 120 and the second chamber 121 into the first outflow side space 117 and the second outflow side space 118 of the outflow side region 112 enters the second header portion 53. It is introduced into each connected heat transfer tube 20.

As described above, in this embodiment as well as the first embodiment and the second embodiment, the connecting pipe main body 62 is connected across the first chamber 120 and the second chamber 121 in the second header portion 53. It is possible to introduce a refrigerant having substantially the same gas-liquid ratio into these two chambers. These refrigerants are respectively introduced into the second heat transfer tube 23 through the flow path in the second header portion 53. Therefore, the gas-liquid ratio of the refrigerant introduced into the second heat transfer tube 23 can be made uniform, and a decrease in heat exchange performance can be avoided.
In addition, the 1st through-hole 114 and the 2nd through-hole 115 are not restricted to said arrangement | positioning location, For example, you may arrange | position both these in the lower part of the vertical partition plate 111. FIG. That is, the first through hole 114 and the second through hole 115 may be disposed at any location on the vertical partition plate 111. Further, the first through hole 114 and the second through hole 115 may not only form one, but may be formed in plural.

The embodiment of the present invention has been described above, but the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention.
For example, in the present embodiment, the first header portion 52 and the second header portion 53 have the same axis O and the axis O extends in the vertical direction, but the present invention is not limited to this. For example, the axis O direction may be a horizontal direction, or may be an inclined direction that is inclined with respect to the horizontal direction and the vertical direction.

  In the embodiment, the first header part 52 and the second header part 53 are formed in the same header 30, but the first header part 52 and the second header part 53 may be configured separately. In this case, the postures of the first header portion 52 and the second header portion 53 may be different from each other, that is, the first header portion 52 is on an axis O different from the axis O of the second header portion 53. You may comprise the cylinder shape extended along.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Compressor 3 Indoor heat exchanger 4 Expansion valve 5 Outdoor heat exchanger 6 Four way valve 7 Piping 10 Heat exchanger 20 Heat transfer tube 21 First heat transfer tube 22 First tube group 23 Second heat transfer tube 24 Second Pipe group 25 Lower second pipe group 26 Upper second pipe group 28 Fin 30 Header 40 Entrance / exit side header 41 Partition plate 42 Lower entrance / exit area 43 Upper entrance / exit area 50 Return side header 51 Header body 52 First header section 53 Second header Portion 54 Lower space 55 Upper space 58 Main partition plate 60 Second header inner partition plate 61 Connection pipe 62 Connection tube body 63 First end 64 Second end 65 First tube portion 66 Second tube portion 67 Connection tube portion 68 First One bent portion 69 Second bent portion 70 Dividing portion 71 First flow path 72 Second flow path 75 Notch portion 80 Heat exchanger 81 Second header inner partition plate 82 Vertical partition portion 83 First horizontal partition portion 84 First Horizontal partition portion 86 Lower space 87 Upper space 90 Connection tube 91 Connection tube body 92 First end 93 Second end 94 First tube portion 95 Second tube portion 96 Connection tube portion 97 First bent portion 98 Second bent portion 100 Dividing part 101 First flow path 102 Small flow path 103 Second flow path 104 Small flow path 105 Cut section 110 Heat exchanger 111 Vertical partition plate 112 Outflow side area 113 Inflow side area 114 First through hole 115 Second through hole 116 Horizontal Partition plate 117 First outflow side space 118 Second outflow side space 119 Second header inner partition plate 120 First chamber 121 Second chamber O Axis

Claims (16)

A first heat transfer tube in which a plurality of refrigerants are circulated and spaced apart from each other;
A first header part in which each of the first heat transfer tubes is connected to the internal space in a communicating state with a cylindrical shape;
A second heat transfer tube in which a plurality of refrigerants are circulated and arranged at intervals,
A second header portion that is formed in a cylindrical shape extending along the axis and each of the second heat transfer tubes is connected to the internal space in a communicating state;
A second header inner partition plate that partitions the internal space of the second header portion into two regions;
The first end is connected to the outer peripheral surface of the first header portion in communication with the internal space of the first header portion, and the second end opposite to the first end is the outer peripheral surface of the second header portion. Connected to the internal space of the second header portion, and the second end opening contacts the second header inner partition plate so that the second end opening is the second header inner partition plate. And a connecting pipe having a connecting pipe main body disposed across two regions partitioned by the heat exchanger. The second header inner partition plate has a plate shape extending along a plane orthogonal to the axis of the second header portion,
One of the two regions is a first space partitioned on the one side in the axial direction with the second header inner partition plate as a boundary,
2. The heat exchanger according to claim 1, wherein the other of the two regions is a second space partitioned on the other side in the axial direction with the second header inner partition plate as a boundary. The second header inner partition plate is
A vertical partition portion in a second header portion that extends along a plane including the axis and contacts the opening of the second end of the connection pipe;
A first horizontal partition portion that has a plate shape extending from an edge portion on one side in the axial direction of the vertical partition portion toward only one side in a direction orthogonal to the plate surface of the vertical partition portion;
A second horizontal partition portion that has a plate shape extending from the edge portion on the other side in the axial direction of the vertical partition portion toward only the other side in the direction orthogonal to the plate surface of the vertical partition portion;
One of the two regions is a first space partitioned on one side in the axial direction of the first horizontal partition and the second horizontal partition,
2. The heat exchanger according to claim 1, wherein the other of the two regions is a second space partitioned on the other side in the axial direction of the first horizontal partition and the second horizontal partition. The space in the second header portion is divided into an outflow side region to which each of the second heat transfer tubes is connected and an inflow side region to which the second end of the connection tube is connected in a cross-sectional view orthogonal to the axis. A vertical divider,
A lateral partition that partitions the outflow side region into a first outflow side space and a second outflow side space arranged side by side in the axial direction;
The second header inner partition plate is along a plane including the axis so as to partition the inflow side region into a first chamber and a second chamber adjacent to each other in the circumferential direction of the second header portion in a horizontal sectional view. It has a plate shape that extends,
A first through hole that communicates the first chamber and the first outflow side space is formed in a portion facing the first chamber in the vertical partition plate,
A second through hole that connects the second chamber and a region above the second outflow side space is formed in a portion facing the second chamber in the vertical partition plate,
One of the two regions is the first chamber,
The heat exchanger according to claim 1, wherein one of the two regions is the second chamber. The connecting pipe is
Extending from the second header inner partition plate into the connecting pipe main body and communicating at least the second end of the connecting pipe main body with only one of the two areas. The heat exchanger as described in any one of Claim 1 to 4 which further has a division part divided | segmented into the 1st flow path to perform and the 2nd flow path connected only to the other area | region. The connecting pipe body is
A first pipe portion extending radially outward of the first header portion from the first header portion;
A second pipe portion extending radially outward of the second header portion from the second header portion;
A connecting tube portion that bends and extends with respect to the first tube portion and the second tube portion so as to connect the first tube portion and the second tube portion,
6. The heat exchanger according to claim 5, wherein the divided portion continuously extends from the second end to at least the middle of the first tube portion via the second tube portion and the connecting tube portion.   The heat exchanger according to claim 6, wherein the dividing portion extends from the second end to the first end. The first header part has a cylindrical shape extending along the axis on one side in the axial direction of the second header part,
The heat exchanger according to claim 6 or 7, wherein the first pipe part, the second pipe part, and the connection pipe part of the connection pipe extend on a virtual plane including the axis.   The heat exchanger according to any one of claims 5 to 8, wherein the first channel and the second channel are adjacent to each other in a vertical direction on a first end side of the connection pipe body.   The heat exchanger according to any one of claims 5 to 8, wherein the first flow path and the second flow path are adjacent in the horizontal direction on the first end side of the connection pipe main body. Each of the first flow path and the second flow path has a small flow path in which a plurality of the first flow path and the second flow path are arranged in parallel in the adjacent direction of the first flow path and the second flow path.
The heat exchanger according to any one of claims 5 to 10, wherein the connection pipe has a flat tubular shape in which a parallel direction of the small flow paths is a longitudinal direction.   The heat exchanger according to any one of claims 5 to 11, wherein flow path cross-sectional areas of the first flow path and the second flow path are different from each other. The second header inner partition plate is formed with a notch that is recessed inward from the radially outer side of the second header portion,
The heat exchanger according to any one of claims 5 to 12, wherein a second end of the connection pipe body is fitted in the notch. The connection pipe is formed with a cut portion extending from the second end along the divided portion,
The heat exchanger according to any one of claims 5 to 12, wherein the cut portion and the second header inner partition plate are fitted to each other. The first header portion includes a header body having a cylindrical shape centered on the axis, and a main partition plate that divides the header body in the axial direction on one side in the axial direction of the main partition plate. Part,
The second header portion is a portion on the other side in the axial direction of the main partition plate in the header,
The heat exchanger according to any one of claims 1 to 14, wherein the axial direction is a vertical direction.   An air conditioner provided with the heat exchanger as described in any one of Claims 1-15.

Images