WO2017150126A1

WO2017150126A1 - Heat exchanger and air conditioner

Info

Publication number: WO2017150126A1
Application number: PCT/JP2017/004744
Authority: WO
Inventors: 青木　泰高; 秀哲立野井; 洋平葛山; 将之左海
Original assignee: 三菱重工業株式会社
Priority date: 2016-02-29
Filing date: 2017-02-09
Publication date: 2017-09-08
Also published as: EP3425321A1; JP6145189B1; EP3425321A4; JP2017155989A; EP3425321B1

Abstract

Provided is a heat exchanger comprising a connection pipe having a connection pipe body. The connection pipe body is configured such that: a first end of the pipe body is connected to the outer peripheral surface of a first header (52) so as to be in communication with the inner space of the first header (52); a second end of the pipe body, the second end being located on the side opposite the first end, is connected to the outer peripheral surface of a second header (53) so as to be in communication with the inner space of the second header (53); and the opening of the second end is in contact with a partition plate (60) within the second header to cause the opening of the second end to be mounted to bridge two regions separated by the partition plate (60) within the second header.

Description

Heat exchanger and air conditioner

The present invention relates to a heat exchanger and an air conditioner.
This application claims priority based on Japanese Patent Application No. 2016-038327 for which it applied to Japan on February 29, 2016, and uses the content here.

A heat exchanger for an air conditioner is known 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 header on the folded side, a plurality of areas are defined by a partition plate that divides 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 including a connecting pipe having one main pipe part and a branch pipe part extending from the main pipe part in two. 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 Laid-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.

For this reason, depending on the location of the branch pipes, more liquid refrigerant flows through only some of the branch pipes, and the flow rate and the 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 in the refrigerant distribution ratio at the time of the diversion will occur 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 connecting pipe of Patent Document 1, handling is complicated to avoid interference between a plurality of connecting 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.

Therefore, an object of the present invention is to provide a heat exchanger capable of suppressing performance degradation (efficiency degradation) and an air conditioner using the heat exchanger.

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 of the first heat transfer tubes is formed in a cylindrical shape. A first header portion connected in communication with each other, a second heat transfer tube in which a plurality of refrigerants circulate in the interior and arranged at intervals, and a cylindrical shape extending along an axis to form each of the second heat transfer tubes. A second header part connected to the internal space in a state in which the heat pipe communicates, 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 The second end opposite to the first end is connected to the outer peripheral surface in communication with the inner space of the first header portion, and the inner space of the second header portion is connected to the outer peripheral surface of the second header portion. The second end opening is in contact with the second header inner partition plate. Comprises a connecting tube having a connecting tube body with an opening end is disposed across the two regions partitioned by the second header partition plates, the.

According to such a heat exchanger, since the refrigerant introduced into the connecting pipe body from the first header portion spans the two areas in the second header portion, the second end opening of the connecting pipe body, It will be introduced into 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.

Furthermore, the refrigerant introduced from the first end of the connecting pipe main body and introduced from the second end into the two areas of the second header portion flows through the same path in the connecting pipe main body. For this reason, the deviation of the gas-liquid ratio of the refrigerant introduced into the two regions can be reduced. Therefore, it is possible to suppress the performance deterioration (efficiency reduction) of the heat exchanger.

In the heat exchanger according to the second aspect of the present invention, the second header inner partition plate has a plate shape extending along a plane orthogonal to the axis of the second header portion, and One of the two regions is a first space defined on one side in the axial direction, which is a direction in which the axis extends with the second header inner partition as a boundary, and the two of the two regions The other may be a second space partitioned on the other side in the axial direction with the second header inner partition plate as a boundary.

By adopting such a configuration, it is possible to make 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 uniform.

Moreover, the heat exchanger which concerns on the 3rd aspect of this invention WHEREIN: Said 2nd header inner partition plate makes | forms plate shape extended along the plane containing the said axis line in the 2nd header part, and is 2nd of the said connecting pipe. One of the vertical partition part which the opening part of an end touches, and the direction orthogonal to the plate | board surface of this vertical partition part from the edge part of the axial direction which is the direction where the said axis line extends among this vertical partition part A first horizontal partition portion that has a plate shape extending only to the side, and an edge on the other side in the axial direction of the vertical partition portion toward only the other side in a direction orthogonal to the plate surface of the vertical partition portion. And one of the two regions is partitioned on one side in the axial direction of the first horizontal partition and the second horizontal partition. The first space, the other of the two regions is an axis direction of the first horizontal partition and the second horizontal partition It may be a second space defined in the other side.

By adopting such a configuration, 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 can be made uniform.

Further, in the heat exchanger according to the fourth aspect of the present invention, the space in the second header portion is connected to the outflow side region to which each of the second heat transfer tubes is connected in the cross-sectional view orthogonal to the axis. A vertical partition that divides into an inflow side region to which a second end of the pipe is connected; a first outflow side space juxtaposed in an axial direction in which the axial line extends in the outflow side region; and a second A first partition adjacent to each other in the circumferential direction of the second header portion in a horizontal sectional view of the inflow side region. And a plate extending along a plane including the axis so as to be partitioned into the second chamber, the first chamber and the first outflow side at a portion facing the first chamber in the vertical partition plate A first through hole that communicates with the space is formed, and the second chamber in the vertical partition plate faces the second chamber. A second through-hole is formed in the portion to communicate the second chamber and the region above the second outflow side space, and one of the two regions is the first chamber, One of the two regions may be the second chamber.

By adopting such a configuration, it is possible to make 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 uniform.

Further, in the heat exchanger according to the fifth aspect of the present invention, the connection pipe extends continuously from the second header inner partition plate into the connection pipe main body, and at least the connection pipe main body You may further have the division part which divides | segments the part containing a 2nd end into the 1st flow path connected only to one area | region of the said 2 area | region, and the 2nd flow path connected only to the other area | region. .

The refrigerant introduced into the connecting pipe main body may be separated into a gas phase component and a liquid phase component in the process of flowing through the connecting pipe main 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.

Moreover, the heat exchanger which concerns on the 6th aspect of this invention WHEREIN: The said connection pipe main body is a 1st pipe part extended from the said 1st header part to the radial direction outer side of this 1st header part, and said 2nd header part. A second pipe portion extending radially outward from the second header portion, and a connection extending by bending with respect to the first pipe portion and the second pipe portion so as to connect the first pipe portion and the second pipe portion A pipe part, and the dividing part may extend continuously from the second end to at least the middle of the first pipe part via the second pipe part and the connecting pipe part. .

In general, a liquid phase refrigerant having a large specific gravity on the outside of the bend due to centrifugal force at 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. 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.

On the other hand, it is a bent part that is easy to separate the gas and liquid by adopting a configuration in which the divided part of the connecting pipe extends from the bent part between the first pipe part and the connecting pipe part to the part on the first header side. 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.

Moreover, in the heat exchanger according to the seventh aspect of the present invention, the dividing portion may extend from the second end to the first end.

With such a configuration, the amount of refrigerant flowing through the first flow path and the second flow path in the connection pipe is determined when the refrigerant is introduced from the first header portion into the connection pipe. Moreover, since the 1st flow path and the 2nd flow path are connected to the same location of the 1st header, the refrigerant | coolants of the same gas-liquid ratio are each introduce | transduced. 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.

Moreover, in the heat exchanger according to the eighth aspect of the present invention, the first header has a cylindrical shape extending along the axis on one side of the second header portion in the axial direction, The first pipe part, the second pipe part, and the connection pipe part of the connection pipe 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.

Moreover, in the heat exchanger according to the ninth aspect of the present invention, 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 such a configuration, since a refrigerant having a gas-liquid ratio is introduced into the first flow path and the second flow path, the gas-liquid ratio of the refrigerant introduced into the two regions in the second header is made uniform. Can be achieved.

Moreover, in the heat exchanger according to the tenth aspect of the present invention, the first flow path and the second flow path may be adjacent to each other in the horizontal direction on the first end side of the connection pipe body.

Generally, a refrigerant in a liquid phase is likely to gather downward due to gravity, and a refrigerant in a gas phase is likely to gather upward. For this reason, the gas-liquid ratio of a refrigerant | coolant may change with the up-down direction also in a 1st header part. Even in this case, since the first flow path and the second flow path are adjacent to each other in the horizontal direction, the same gas-liquid ratio refrigerant is introduced into the first flow path and the second flow path. Thereby, the gas-liquid ratio of the refrigerant introduced into the two regions in the second header can be made uniform.

The heat exchanger according to the eleventh aspect of the present invention is a small heat exchanger in which a plurality of the first flow path and the second flow path are arranged in parallel in the direction adjacent to the first flow path and the second flow path. The connecting pipe may have a flat tubular shape having a longitudinal direction in which the small channels are arranged side by side.

By adopting such a configuration, for example, the radius of curvature at the bent portion of the connecting pipe can be made smaller than when the connecting pipe has a circular cross section. For this reason, the effective area which heat-exchanges with the air as a heat exchanger can be ensured widely by making the volume which a connection pipe occupies small.

Further, in the heat exchanger according to the twelfth aspect of the present invention, the channel cross-sectional areas of the first channel and the second channel 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.

Further, in the heat exchanger according to the thirteenth aspect of the present invention, 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, The second end of the connecting pipe main body may be fitted into the notch.

With such a configuration, the connecting pipe can be easily positioned and the workability can be improved.

Further, in the heat exchanger according to the fourteenth aspect of the present invention, 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 partition The plate may be fitted to each other.

Further, in the heat exchanger according to the fifteenth aspect of the present invention, the first header portion has a cylindrical header body centered on the axis, and the direction in which the axis extends in the header body. A portion of the main partition plate on one side in the axial direction in the header having a main partition plate partitioned in the axial direction, wherein the second header portion is the other in the axial direction of the main partition plate in the header. The axial direction may be an up-down direction.

Thus, the heat exchanger which has these 1st header parts and the 2nd header parts is constituted easily by forming the 1st header part and the 2nd header part via the main partition board in one header. be able to.

Also, an air conditioner according to a sixteenth aspect of the present invention includes any one of the above heat exchangers.

Thus, by providing any one of the above heat exchangers, it is possible to suppress a decrease in heat exchange performance and to realize a highly efficient air conditioner.

According to the present invention, performance degradation (efficiency degradation) of the heat exchanger or the air conditioner 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 the 1st Embodiment of this invention. It is a perspective view of the heat exchanger which concerns on the 1st Embodiment of this invention. It is sectional drawing of the 1st pipe part of the connection pipe of the heat exchanger which concerns on the 1st Embodiment of this invention. It is sectional drawing of the 2nd pipe part of the connecting pipe of the heat exchanger which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the heat exchanger which concerns on the 1st modification of the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the heat exchanger which concerns on the 2nd modification of the 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 1st embodiment of the present invention. It is sectional drawing of the 1st pipe part of the connection pipe of the heat exchanger which concerns on the 4th modification of the 1st Embodiment of this invention. It is sectional drawing of the 2nd pipe part of the connection pipe of the heat exchanger which concerns on the 4th modification of the 1st Embodiment of this invention. It is a perspective view of the heat exchanger which concerns on the 2nd Embodiment of this invention. It is the figure which looked at the 2nd header part of the heat exchanger which concerns on the 2nd Embodiment of this invention from the connection direction of the connection pipe. It is sectional drawing of the connecting pipe of the heat exchanger which concerns on the 1st modification of the 2nd Embodiment of this invention. It is sectional drawing of the connecting pipe of the heat exchanger which concerns on the 2nd modification of the 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 the 2nd Embodiment of this invention. It is sectional drawing of the connecting pipe of the heat exchanger which concerns on the 4th modification of the 2nd Embodiment of this invention. It is a perspective view of the 2nd header part of the heat exchanger which concerns on the 3rd Embodiment of this invention. It is a horizontal sectional view of the 2nd header part of the heat exchanger concerning a 3rd embodiment of the present invention.

[First Embodiment]
The air conditioner 1 including the heat exchanger 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3, 4A, and 4B.

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. The outdoor heat exchanger 5 is used as a condenser and dissipates heat to the outside during cooling operation. The outdoor heat exchanger 5 is used as an evaporator during the heating operation and absorbs heat from the outside.

The four-way valve 6 switches the direction of refrigerant flow between the heating operation and the cooling operation. Thus, 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 is circulated 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 a refrigerant flows is formed. A plurality of the heat transfer tubes 20 are arranged at intervals in the vertical direction, and are arranged in parallel to each other.

In the first 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 inside the heat transfer tube 20. Is formed. The plurality of flow paths are arranged in parallel to each other. For this reason, 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 disposed between the heat transfer tubes 20 arranged as described above. In 1st Embodiment, it extends so that it may contact to the heat exchanger tube 20 adjacent up and down alternately as it goes to the extending direction of each heat exchanger tube 20 (it extends in corrugated form). 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 that the heat transfer tubes 20 are sandwiched between both ends of the plurality of heat transfer tubes 20. One of the pair of headers 30 is an inlet / outlet header 40 serving 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. Has been.

The entrance / exit header 40 is a cylindrical member extending in the vertical direction. The entrance / exit header 40 is closed at the upper and lower ends and is partitioned into two upper and lower regions by a partition plate 41. A lower area defined by the partition plate 41 is a lower access area 42. On the other hand, the upper area is an upper entrance / 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.

Among the plurality of heat transfer tubes 20, the heat transfer tube 20 connected in communication with the lower entrance / exit region 42 is a first heat transfer tube 21. The heat transfer tube 20 connected in a communicating state with the upper entrance / exit region 43 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 body 51 is a cylindrical member that extends along the axis O with the axis O of the header body 51 as the center. The upper end and the lower end of the header body 51 are closed. The header main body 51 of the first embodiment extends in a state in which 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 the upper (other side in the axis O direction) sectioned 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 first embodiment, the header main body 51 is partitioned by the main partition plate 58, so that the first header portion 52 and the second header portion 53 each having a space therein are provided in the folded-back header 50. Is formed. 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 first 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 tube 23 is connected to the second header portion 53 so as to be in communication 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 connecting 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 connecting pipe 61 has a connecting pipe main body 62 and a dividing portion 70.

The connecting pipe main body 62 is a tubular member, and includes a first pipe part 65, a second pipe part 66, and a connecting 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. The 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 was connected in the circumferential direction position of the 1st header part 52 (header main body 51).

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. The 2nd pipe part 66 is connected to the part similar to the connection location 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 so that 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 connecting pipe main body 62 configured as described above, the first pipe portion 65, the second pipe portion 66, and the connecting pipe portion 67 extend on a virtual plane including the axis O.

The end connected to the first header portion 52 of the first pipe portion 65 in the connecting pipe main body 62 is a first end 63 of the connecting 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 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 connecting 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 first embodiment, the dividing portion 70 is connected to the first pipe portion 65 inside the connecting pipe main body 62 from the first header portion 52 via the connecting pipe portion 67 and the second pipe portion 66. The second header portion 53 is connected to the connection portion. 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.

As shown in FIG. 6, the dividing portion 70 extends in a plate shape along the horizontal plane in each of the first tube portion 65 and the second tube portion 66. Thereby, the dividing part 70 divides the inside of the first pipe part 65 and the inside of the second pipe part 66 into two upper and lower flow paths.

Furthermore, the dividing portion 70 extends along a vertical plane orthogonal to the plane including the axis O of the header body 51 in the connecting pipe portion 67. Thus, the dividing unit 70 divides the inside of the connecting pipe part 67 into a flow path on the side close to the header main body 51 and a flow path on the side separated from the header main body 51.

In the first embodiment, the first flow path 71 includes a lower flow path in the first pipe portion 65, a flow path on the side away from the header body 51 in the connection pipe portion 67, and a second pipe portion 66. It is comprised by the upper flow path in the inside. 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, the first flow path 71 and the second flow path 72 are adjacent to each other in the vertical direction even at the openings of both the first end 63 and the second end 64 of the connection pipe 61.

The end of the dividing portion 70 on the second end 64 side is in contact with the second header partition plate 60 in the second header portion 53. Thereby, the division | segmentation part 70 is extended in the connection pipe main body 62 from the partition plate 60 in the 2nd header. 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, the heat exchanger 10 is used as an evaporator during the cooling operation of the air conditioner 1. In the case of the outdoor heat exchanger 5, it is used as an evaporator during the heating operation of the air conditioner 1.

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.

Among the gas-liquid two-phase refrigerant supplied into the first header portion 52, a refrigerant having a high liquid phase content and a high density gathers under the first header portion 52 due to gravity, and a refrigerant having a high gas phase content and a low density. It will gather at the top of the first header portion 52. That is, in the first header portion 52, the gas-liquid ratio of the refrigerant differs at the vertical position.

In the first embodiment, the first flow path 71 and the second flow path 72 communicating 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 path 71 and the second flow path 72 are arranged in parallel with each other is connected to the first header portion 52.

For this reason, the first flow path 71 and the second flow path 72 are supplied with substantially the same refrigerant 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 The gas-liquid ratio of the 55 refrigerant 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 and circulates in 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. And this refrigerant | coolant is introduce | transduced into the piping 7 from the upper entrance / exit area | region 43, and circulates through a refrigerant circuit.

As described above, in the first 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. The path 72 is connected to the vertical position of the first header portion 52.

For this reason, substantially the same gas-liquid 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 first embodiment, since 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, Even when 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 differ greatly.

Further, in the first embodiment, there is only one connection point for the first header portion 52 and the second header portion 53 of the connection pipe 61. As a result, for example, the connection 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.

Further, by forming a plurality of flow paths (first flow path 71 and second flow path 72) in a single connection pipe 61, the area occupied by the connection pipe 61 can be reduced. For example, 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 realized.

Next, a first modification of the first embodiment will be described with reference to FIG. As a first modification of the first embodiment, the connection pipe 61 may be configured without the dividing portion 70. In this case, the connecting pipe 61 is composed only of the connecting pipe main body 62.

According to the first modification of the first embodiment having such a configuration, the connection pipe 61 is introduced from the first end 63 of the connection pipe main body 62 even if the connection pipe 61 does not have the dividing portion 70. The refrigerant introduced into the two regions of the second header portion 53 from the second end 64 circulates in the same path in the connecting pipe main body 62 and enters the lower space 54 and the upper space 55 of the second header portion 53. be introduced. For this reason, the deviation of the gas-liquid ratio of the refrigerant introduced into the two regions can be reduced.

Next, a second modification example of the first embodiment will be described with reference to FIG. As a second modified example of the first embodiment, the formation range of the dividing portion 70 may be different from that of the first embodiment.

In the second modification of the first embodiment, the dividing portion 70 of the connecting pipe 61 is connected to the first pipe portion from the second end 64 of the connecting pipe main body 62 via the second pipe portion 66 and the connecting pipe portion 67. It is formed so as to extend halfway through 65, that is, before the first end 63.

For example, in the case of the connecting pipe 61 having a structure that does not have the dividing portion 70 as in the first modification, the first bent portion 68 and the second bent portion 69 may change the gas phase and liquid of the refrigerant depending on the flow rate and flow rate of the refrigerant. The phases 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. As a result, the refrigerant having a largely different gas-liquid ratio is present 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 divided portion 70 extends from the first bent portion 68 to the first end 63 side of the connection pipe 61, the refrigerant introduced from the first end 63 of the connection 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. For this reason, the gas-liquid ratio of the refrigerant | coolant which distribute | circulates between the 1st flow path 71 and the 2nd flow path 72 does not differ greatly. Therefore, the performance fall of the heat exchanger 10 can be suppressed similarly to 1st Embodiment.

Next, a third modification of the first embodiment will be described with reference to FIG. In the 3rd modification of 1st Embodiment, the notch part 75 recessed from the outer peripheral side of this 2nd header inner partition plate 60 is provided in the connection area | region with the connection pipe 61 in the 2nd header inner partition plate 60, and the 1st The second end 64 of the connecting pipe 61 that has entered the inside of the two header parts 53 is configured to fit into the cutout part 75.

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.

Thereafter, 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 modification of the first embodiment, since the connection pipe 61 can be easily positioned when the heat exchanger 10 is manufactured, the workability can be improved.

Next, a fourth modification of the first embodiment will be described with reference to FIGS. 8A and 8B. In the fourth modification of the first embodiment, the first flow path 71 and the second flow path 72 in the connection pipe 61 are arranged side by side in the vertical direction in the second pipe section 66, while the first pipe section In 65, it is set as the structure arranged in parallel in the horizontal direction.

That is, in the fourth modified example, the division part 70 in the first pipe part 65 has a plate shape extending in the vertical direction, and thereby the first pipe part 65 is arranged in parallel in the horizontal direction. The flow path is divided into a single flow path 71 and a second flow path 72.

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. Thereby, the same refrigerant | coolant of a gas-liquid ratio is introduce | transduced into the 1st flow path 71 and the 2nd flow path 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 side by side in the vertical direction. The gas-liquid ratio of the refrigerant can be made uniform.

In the fourth modification, it is only necessary that the first flow path 71 and the second flow path 72 are arranged in parallel in at least 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 division 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 division 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.

[Second Embodiment]
With reference to FIG.9 and FIG.10, the heat exchanger 80 which concerns on the 2nd Embodiment of this invention is demonstrated. In FIG. 9 and FIG. 10, 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 partition plate 81 and the connecting pipe 90.

The second header inner partition plate 81 of the second embodiment has 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 94 and the second pipe portion 95).

In 2nd Embodiment, the vertical partition part 82 is extended over the diametrical direction over the side to which the 2nd heat exchanger tube 23 was connected in the 2nd header part 53, and the side to which the connection pipe 90 was connected. . 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 line with the lower 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.

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

The second header portion 53 is partitioned into two spaces by such a second header inner partition plate 81. 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 unit 100. Similar to the first embodiment, the connecting pipe main body 91 is a tubular member that allows the first header portion 52 and the second header portion 53 to communicate with each other, and the first end 92 is an outer periphery 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 2nd Embodiment, it is set as the flat shape which makes a horizontal direction a longitudinal direction. As in the first embodiment, the connecting pipe main body 91 is composed of three tubular members, a first pipe portion 94, a second pipe portion 95, and a connecting pipe portion 96, and the first pipe portion 94 and the connecting pipe portion. 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. For this reason, the opening part of the second end 93 part of the connecting pipe main body 91 is in contact with the vertical partition part 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 second 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. It is said that.

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 section 100 is a first flow path 101 that allows the inside of the first header section 52 and the lower space 86 of the second header section 53 to communicate with each other. 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.

Also in the heat exchanger 80 of the second embodiment described above, as in the first embodiment, 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 first flow path 101 and the second flow path 103 are circulated and 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.

Further, in the second embodiment, since the shape of the connecting pipe main body 91 is a flat tubular shape, the first bent portion 97 and the second bent portion 98 are compared with, for example, a circular shape having a similar channel cross-sectional area. The radius of curvature at 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.

Next, a first modification example of the second embodiment will be described with reference to FIG. In the first modification of the second embodiment, the first flow channel 101 and the second flow channel 103 in which a part of the flow channel having a circular cross section is cut out in a straight line form a divided portion that forms the straight part. 100 is provided so as to be juxtaposed with each other. Such a structure may be adopted.

Next, a second modification example of the second embodiment will be described with reference to FIG. In the second modification of the second embodiment, a plurality of connecting pipes 90 are arranged in parallel in the direction in which the first flow path 101 and the second flow path 103 are adjacent to the first flow path 101 and the second flow path 103, respectively. Alternatively, a flat tube structure having

small flow paths

102 and 104 may be used.
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 104.

Next, a third modification example of the second embodiment will be described with reference to FIG. In the third modified example of the second embodiment, the connection pipe main body 91 and the split part 100 in the connection pipe 90 are formed with a cut part 105 extending from the second end 93 to the first end 92 side along the split part 100. The cut portion 105 and the second header inner partition plate 81 are fitted to each other.

With such a configuration, the first flow path 101 and the second flow path 103 are not in communication with each other, and the first flow path 101 and the second flow path 103 are respectively connected to the lower space 86 and the upper space 87. While maintaining the communication state, the connecting pipe 90 can be easily positioned, and the workability can be improved.

Next, a fourth modification of the second embodiment will be described with reference to FIG. In the fourth modification of the second embodiment, the channel cross-sectional areas of the first channel 101 and the second channel 103 are different from each other. In the fourth modified example of the second embodiment, 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 is larger than the number of the two heat transfer tubes 23, the cross-sectional area of the first flow path 101 is set large as described above, and the flow rate of the refrigerant introduced into the lower space 86 is increased. The heat exchange efficiency of 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 2nd Embodiment is extended only to the perpendicular direction, it is not limited to this, You may incline with respect to the 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. .

[Third Embodiment]
With reference to FIG.15 and FIG.16, the heat exchanger 110 which concerns on the 3rd Embodiment of this invention is demonstrated. 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 according to the third embodiment is different from the first embodiment in the structure within 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. A heat transfer tube 20 similar to that of the first embodiment is connected to the second header portion 53.

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 third 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 third 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 1st through-hole 114 and the 2nd through-hole 115 are arrange | positioned in the location from which an up-down direction position differs mutually. In the third embodiment, the first through hole 114 is formed at a position 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 be different in the vertical position from the connection location to the second header portion 53 of the connection pipe 61.

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 third embodiment, the connection portion of the connection pipe body 62 with the second header portion 53 is the 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 the third embodiment, the refrigerant introduced from the connection pipe 61 into the second header portion 53 is such that the connection pipe main body 62 communicates with both the first chamber 120 and the second chamber 121. Therefore, the refrigerant of almost the same gas / liquid ratio is introduced into the first chamber 120 and the second chamber 121.

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. And introduced into the second outlet side space 118 of the outlet 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 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, also in the third 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 as in the first embodiment and the second embodiment. Therefore, 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.

Note that the first through hole 114 and the second through hole 115 are not limited to the above-described arrangement locations, and for example, both of them may be arranged below the vertical partition plate 111. 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.

As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, In the range which does not deviate from the technical idea of the invention, it can change suitably.

For example, in the third 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. However, 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.

Moreover, although the case where the first header part 52 and the second header part 53 were formed in the same header 30 was described as an example, the first header part 52 and the second header part 53 are configured separately. Also good. 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.

The present invention is applicable to a heat exchanger and an air conditioner equipped with the heat exchanger.

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, 80, 110 Heat exchanger 20 Heat transfer tube 21 First heat transfer tube 22 First tube group 23 Second transfer Heat pipe 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, 86 Lower space 55, 87 Upper space 58 Main partition plate 60, 81, 119 Second header inner partition plate 61, 90 Connection pipe 62, 91 Connection pipe body 63, 92 First end 64, 93 2nd end 65,94 1st pipe part 66,95 2nd pipe part 67,96 Connection pipe part 68,97 1st bending part 69,98 2nd bending part 70,1 0 division | segmentation part 71,101 1st flow path 72,103 2nd flow path 75 Notch part 82 Vertical partition part 83 1st horizontal partition part 84 2nd horizontal partition part 102,104 Small flow path 105 Cut part 111 Vertical partition plate 112 Outflow side region 113 Inflow side region 114 First through hole 115 Second through hole 116 Horizontal partition plate 117 First outflow side space 118 Second outflow side space 120 First chamber 121 Second chamber O Axis line

Claims

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 one side in the axial direction, which is a direction in which the axis extends 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;
Among the vertical partitioning portions, a plate-like shape extending from an edge portion on one side in the axial direction, which is a direction in which the axis extends, to only one side in a direction orthogonal to the plate surface of the vertical partitioning portion. One horizontal partition,
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 partition plate, and a horizontal partition plate that divides the outflow side region into a first outflow side space and a second outflow side space arranged in parallel in the axial direction in which the axis extends.
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 tube portion, the second tube portion, and the connecting tube portion of the connection tube extend on a virtual plane including the axis.
The heat exchanger according to any one of claims 5 to 8, wherein the first flow path and the second flow path are adjacent to each other in a vertical direction on a first end side of the connection pipe main body.
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 the horizontal direction on the first end side of the connection pipe 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 with a parallel direction of the small flow paths as a longitudinal direction.
The heat exchanger according to any one of claims 5 to 11, wherein the 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 cut-out portion extending along the divided portion from the second end is formed in the connection pipe, and the cut-out portion and the partition plate in the second header are fitted to each other. The heat exchanger as described in any one of them.
The first header section includes a main body partition in a header having a header body having a cylindrical shape centered on the axis and a main partition plate that divides the header body in an axial direction that is a direction in which the axis extends. A portion of one side of the plate in the axial direction,
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 comprising the heat exchanger according to any one of claims 1 to 15.