JP2018100800A - Heat exchanger and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger enabling suppression of performance deterioration.SOLUTION: A heat exchanger includes: heat transfer pipes 20; a header section 30 formed to have a tubular shape extending vertically and having an inner space to which one end of each of the heat transfer pipes 22 is connected in a communicating state; a vertical partition plate 70 that extends over each of the heat transfer pipes 22 and an inner peripheral surface in the header section 30 to partition inside of the header section 30 into a first chamber 76 and a second chamber 77 each communicating with the respective heat transfer pipes 22 in the horizontal cross sectional view in the header section 30 and in which a first communication section 61 is formed to communicate the first chamber 76 and the second chamber 77 with each other at a position higher than the height of the uppermost heat transfer pipe out of the respective heat transfer pipes 22; and a flow passage in which a refrigerant flows with only the first chamber 76 out of the first chamber 76 and the second chamber 77 communicated with outside of the header 30.SELECTED DRAWING: Figure 3

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, the refrigerant introduced into one header and circulated through the heat transfer tube to the other header is folded back at the other header so as to return to the one header through the heat transfer tube again. Has been.

In the folded-back header, a plurality of regions are defined by partition plates that divide 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.
When the refrigerant turns, liquid phase refrigerant having a large specific gravity tends to flow downward, and gas phase refrigerant having a small specific gravity tends to flow upward. Therefore, a drift occurs in the refrigerant flowing into each heat transfer tube.
For example, Patent Document 1 describes that the header is divided into a heat transfer tube side space and a counter heat transfer tube side space by a partition plate, and these spaces are communicated with each other at an upper part and a lower part to suppress refrigerant drift. ing.

JP2015-68623A

  Even if the refrigerant drift due to gas-liquid separation between the liquid-phase refrigerant and the gas-phase refrigerant is suppressed, when the refrigerant flows in from the lower part in the header and rises in the header, a difference in the refrigerant flow rate flowing into each heat transfer tube occurs. In such a state, the heat transfer performance of the heat exchanger cannot be fully utilized. In order to suppress the performance deterioration of the heat exchanger, it is preferable that the refrigerant flow rate flowing into the heat transfer tube is equalized in any heat transfer tube from the upper part to the lower part.

  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.
In other words, the heat exchanger according to the first aspect of the present invention includes a heat transfer tube extending in the horizontal direction and having a refrigerant flowing therein, and a plurality of heat transfer tubes arranged at intervals in the vertical direction, and a tubular shape extending in the vertical direction. And a header portion in which one end of the plurality of heat transfer tubes is connected in communication with an internal space, and the header portion extends over each of the heat transfer tubes and an inner peripheral surface in the header portion in a horizontal sectional view. The inside of the section is divided into a first chamber and a second chamber that communicate with the heat transfer tubes, respectively, and the first chamber and the second chamber are positioned above the height of the uppermost heat transfer tube among the heat transfer tubes. A vertical partition plate that forms a first communication portion that communicates with each other, and a flow passage that is connected to only the first chamber of the first chamber and the second chamber, and through which the refrigerant flows. .

  According to such a heat exchanger, when the heat exchanger is used as an evaporator, the refrigerant is introduced into the first chamber in the header portion via the flow passage. A part of the refrigerant introduced into the first chamber is introduced into each heat transfer tube, but the refrigerant that has not been introduced into the heat transfer tube passes through the second series passage formed at the upper part of the vertical partition plate. It introduce | transduces into a room | chamber and introduce | transduces into each heat exchanger tube, moving below a 2nd chamber | room. As a result, even when the refrigerant flow rate is small, the flow rate of the refrigerant moving in the first chamber can be suppressed, and the amount of refrigerant introduced into each heat transfer tube connected to the upper part or the central part in the header part is secured. Thus, it is possible to suppress the occurrence of variations in the flow rate of the refrigerant flowing through each heat transfer tube. In addition, when the flow rate of refrigerant is large, the refrigerant may concentrate on the upper part of the first chamber, but the refrigerant is introduced into the upper part of the second chamber through the first series part formed at the upper part of the vertical partition plate. Since the refrigerant is introduced into each heat transfer tube while moving downward in the second chamber, the refrigerant is introduced into each heat transfer tube connected to the lower part and the central part in the header part without concentrating on the upper part of the header part. As a result, the amount of refrigerant to be ensured is ensured, so that the variation in the flow rate of the refrigerant flowing through each heat transfer tube can be suppressed.

  In the above heat exchanger, the first series communication portion may be a communication hole formed in the vertical partition plate.

  In the heat exchanger, the first series passage portion may be a gap between the vertical partition plate and the upper end of the header portion.

  In the heat exchanger, the vertical partition plate may form a second communication portion that allows the first chamber and the second chamber to communicate with each other between the vertically adjacent heat transfer tubes.

  Thus, when the heat exchanger is used as a condenser, the refrigerant is introduced from each heat transfer tube into the first chamber and the second chamber in the header portion, and the refrigerant introduced into the first chamber is introduced into the flow passage. The The refrigerant introduced into the second chamber is introduced into the first chamber via the second communication portion formed in the vertical partition plate and then introduced into the flow passage. Thereby, the refrigerant introduced into the second chamber from each heat transfer tube can be introduced into the first chamber via the second communication portion without being accumulated in the second chamber and introduced into the flow passage.

  In the heat exchanger, the vertical partition plate forms a third communication portion that communicates the first chamber and the second chamber with each other at a position below the lowest heat transfer tube among the heat transfer tubes. It may be.

  Thus, when the heat exchanger is used as a condenser, the refrigerant is introduced from each heat transfer tube into the first chamber and the second chamber in the header portion, and the refrigerant introduced into the first chamber is introduced into the flow passage. The The refrigerant introduced into the second chamber moves downward in the second chamber, is introduced into the first chamber via the third communication portion formed in the vertical partition plate, and is then introduced into the flow passage. Thereby, the refrigerant introduced into the second chamber from each heat transfer tube can be introduced into the first chamber via the second communication portion without being accumulated in the second chamber and introduced into the flow passage.

  In the heat exchanger, a lower portion of the vertical partition plate is curved from the second chamber side to the first chamber side, and the third communication portion is between the vertical partition plate and a lower end of the header portion. It may be a gap.

  Thus, when the heat exchanger is used as a condenser, the refrigerant is introduced from each heat transfer tube into the first chamber and the second chamber in the header portion, and the refrigerant introduced into the first chamber is introduced into the flow passage. The The refrigerant introduced into the second chamber moves downward in the second chamber, is introduced into the first chamber via the third communication portion formed in the vertical partition plate, and is then introduced into the flow passage. Thereby, the refrigerant introduced into the second chamber from each heat transfer tube can be introduced into the first chamber via the second communication portion without being accumulated in the second chamber and introduced into the flow passage. Furthermore, since the lower part of the vertical partition plate is curved toward the second chamber, the curved shape guides the flow of the refrigerant, and the refrigerant is easily introduced from the second chamber into the first chamber.

  In the heat exchanger, a length Lp in the header portion of the heat transfer tube in the extending direction of the heat transfer tube may be less than or equal to half of the inner diameter Di of the header portion.

Thereby, when the heat exchanger is used as an evaporator,
Since the length in the header portion of the heat transfer tube is short, the refrigerant in the gas-liquid two-phase state introduced from the flow passage to the first chamber and the first chamber to the second chamber passes through the heat transfer tubes in the first chamber and the second chamber. Disturbances in the refrigerant flow due to accumulation between the upper and lower sides can be suppressed, and the liquid-phase refrigerant is easily introduced into each heat transfer tube. This further suppresses the occurrence of variations in the flow rate of the refrigerant flowing through each heat transfer tube.

The air conditioner according to the second aspect of the present invention includes any one of the above heat exchangers.
As a result, it is possible to suppress the occurrence of variations in the flow rate of the refrigerant flowing through each heat transfer tube, and to avoid a decrease in cooling and heating performance.

  According to the heat exchanger and the air conditioner of the present invention, it is possible to suppress the performance degradation due to the non-uniform refrigerant flow rate flowing through the plurality of heat transfer tubes.

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 a horizontal sectional view of the 2nd header part of the heat exchanger concerning a first embodiment of the present invention. It is an A direction arrow directional view of FIG. It is a perspective view of the heat exchanger which concerns on the modification of 1st embodiment of this invention. It is a horizontal sectional view of the 2nd header part of the heat exchanger concerning the modification of a first embodiment of the present invention. It is a B direction arrow directional view of FIG. It is a perspective view of the heat exchanger which concerns on 2nd embodiment of this invention. It is a horizontal sectional view of the 2nd header part of the heat exchanger concerning a second embodiment of the present invention. It is a C direction arrow directional view of FIG. It is a perspective view of the heat exchanger which concerns on the modification of 2nd embodiment of this invention. It is a horizontal sectional view of the 2nd header part of the heat exchanger concerning the modification of a second embodiment of the present invention. It is a D direction arrow line view of FIG. It is a perspective view 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. It is E arrow line view of FIG. It is a perspective view of the heat exchanger which concerns on the modification of 3rd embodiment of this invention. It is a longitudinal direction sectional view of the 2nd header part of the heat exchanger concerning the modification of a third embodiment of the present invention. It is a F arrow line view of FIG. It is a horizontal sectional view of the 2nd header part of the heat exchanger of the heat exchanger concerning a fourth 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 outdoor heat exchanger 5 performs heat exchange between the refrigerant and the outdoor air.
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 is used as a condenser during the cooling operation and dissipates heat to the outside, and is used as an evaporator during the heating operation 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.
As shown in FIG. 2, the heat exchanger 10 includes a plurality of heat transfer tubes 20, a plurality of fins 23, a pair of headers 30, and a connection tube 55.

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 23 are respectively disposed between the heat transfer tubes 20 arranged as described above. In this embodiment, the fins 23 are alternately arranged in the heat transfer tubes 20 adjacent to each other 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 23 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 / exit header 40 is a cylindrical member extending in the up-down direction, the upper end and the lower end are closed, and the inside is partitioned into two upper and lower regions by a partition plate. A lower area partitioned by the entrance / exit partition plate 41 is a lower entrance / exit area 42, and an 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.
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 22 (heat transfer tube 20).

The folded-back header 50 includes a header body 51, a folded-side partition plate 54, and a vertical partition plate 70.
The header main body 51 is a cylindrical member extending in the vertical direction, and the upper end and the lower end are closed. The folding side partition plate 54 is provided in the header body 51, and divides the space in the header body 51 into two upper and lower areas. The lower part of the folding side partition plate 54 of the header body 51 is a first header part 52, and the upper part of the folding side partition plate 54 of the header body 51 is a second header part 53 (header part). Yes. That is, in the present embodiment, the header main body 51 is partitioned by the folding side partition plate 54, so that the first header portion 52 and the second header portion 53 each having a space therein are formed in the folding side header 50. ing. In other words, the first header portion 52 and the second header portion 53 constitute the folded-back header 50.

  The first heat transfer tubes 21 are connected to the first header portion 52 from one side in the horizontal direction so as to be in communication with the first header portion 52, respectively. The second heat transfer tubes 22 are connected to the second header portion 53 from one side in the horizontal direction so as to communicate with the inside of the second header portion 53, respectively. In other words, the heat transfer tube 20 connected to the first header portion 52 is the first heat transfer tube 21, and the heat transfer tube 20 connected to the second header portion 53 is the second heat transfer tube 22.

  As shown in FIG. 3, the vertical partition plate 70 is a plate-like member extending in the vertical direction and is provided in the second header portion 53. The vertical partition plate 70 divides the space in the second header portion 53 into two regions of a first chamber 76 and a second chamber 77 so that each space communicates with each second heat transfer tube 22 in a horizontal sectional view. ing. Specifically, the vertical partition plate 70 is installed in a direction in which the second heat transfer tube 22 extends in a horizontal sectional view. The vertical partition plate 70 extends in the horizontal direction in the second header portion 53. Accordingly, in the present embodiment, each second heat transfer tube in which the first chamber 76 and the second chamber 77 are separated by the vertical partition plate 70 also between the second heat transfer tubes 22 adjacent in the vertical direction is the second header portion. In the part protruded in 53, the one end by the side of the 2nd heat exchanger tube among the both ends of the horizontal direction of the vertical partition plate 70 is contacting the 2nd heat exchanger tube. The opening of each second heat transfer tube 22 is divided in the horizontal direction perpendicular to the extending direction of the second heat transfer tube 22 by one end of the vertical partition plate.

The connecting pipe 55 is a tubular member having a flow path formed therein, and one end of the connecting pipe 55 is connected to the first header portion 52 in communication with the inside of the first header portion 52, and the other end. Is connected to the second header portion 53 in communication with the inside of the second header portion 53. More specifically, one end of the connection pipe 55 is connected to the central portion of the first header portion 52 in the vertical direction. On the other hand, the other end of the connection pipe 55 is connected to the lower part of the first chamber 76 of the second header part 53.
A flow path formed inside the connection pipe 55 serves as a flow passage 56 that allows the refrigerant to flow between the first header portion 52 and the second header portion 53.
Instead of using the connecting pipe 55, the flow passage 56 may be formed so as to directly connect the inside of the first header portion 52 and the first chamber 76 to the folded-back partition plate 54.

  In the present embodiment, the header 30 has a cylindrical shape extending in the vertical direction, and the internal space is also cylindrical. And the vertical partition plate 70 is arrange | positioned so that the diametrical direction in the horizontal cross sectional view of the internal space of the cylindrical 2nd header part 53 may be followed. As a result, the first chamber 76 and the second chamber 77 each have a semicircular shape in a horizontal sectional view.

  The vertical partition plate 70 is formed with an upper communication hole 62 (first communication portion 61) that allows the first chamber 76 and the second chamber 77 to communicate with each other by passing through the vertical partition plate 70. Specifically, as shown in FIG. 5, the upper communication hole 62 is equal to or higher than the height of the second header portion uppermost heat transfer tube 24, which is the heat transfer tube located at the uppermost position among the second heat transfer tubes 22. Formed in position. The upper communication hole 62 is formed at a position ahead of the tip of the second heat transfer tube 22, that is, on the side opposite to the connection portion between the second header portion 53 and the second heat transfer tube 22 in the horizontal sectional view. .

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. Accordingly, the refrigerant supplied from the first heat transfer tube 21 into the first header portion 52 of the folded-back header 50 is a gas-liquid two-phase in which the liquid phase ratio is reduced due to a partial change from the liquid phase to the gas phase. Becomes a refrigerant.

As shown in FIGS. 2 and 3, the gas-liquid two-phase refrigerant supplied into the first header portion 52 is introduced into a connecting pipe 55 connected to the first header portion 52, and It is introduced into the first chamber 76 in the second header portion 53 through the connecting pipe 55.
The refrigerant introduced into the first chamber 76 sequentially moves upward in the first chamber 76 as the refrigerant continues to be supplied, and is introduced into each second heat transfer tube 22. The refrigerant that has not been introduced into the second heat transfer tube 22 is introduced into the upper portion of the second chamber 77 through the upper communication hole 62 formed in the upper portion of the vertical partition plate 70, and is introduced into the upper portion of the second chamber 77. The refrigerant is introduced into each second heat transfer tube 22 while moving downward in the second chamber 77.

  Here, since the second header portion 53 is divided into the first chamber 76 and the second chamber 77 by the vertical partition plate 70, the cross-sectional area of the refrigerant flow path in the first chamber 76 is the entire second header portion 53. It is smaller than the cross-sectional area. For this reason, even if it is a case where there is little refrigerant | coolant flow volume, it can suppress that the flow velocity of the refrigerant | coolant moving upwards in the 1st chamber 76 falls, and each 2nd connected to the upper part in the 2nd header part 53 or a center part. The amount of refrigerant introduced into the heat transfer tubes 22 is ensured, and the occurrence of variations in the flow rate of the refrigerant flowing through each second heat transfer tube 22 can be suppressed. In addition, when the flow rate of the refrigerant is extremely high, the refrigerant may concentrate on the upper portion of the first chamber 76, but the upper portion of the second chamber 77 is formed via the upper communication hole 62 formed on the upper portion of the vertical partition plate 70. Since the refrigerant is introduced and introduced into each of the second heat transfer tubes 22 while moving downward in the second chamber 77, the refrigerant does not concentrate on the upper portion of the second header portion 53, and the second header portion. Thus, the amount of refrigerant introduced into each second heat transfer tube 22 connected to the lower part or the center part in 53 is secured, and also the occurrence of variation in the flow rate of refrigerant flowing through each second heat transfer tube 22 is suppressed. it can.

Thereafter, the refrigerant is urged to evaporate again by exchanging heat with the external atmosphere of the second heat transfer tube 22 in the course of flowing through the second heat transfer tube 22.
As a result, the liquid phase remaining in the refrigerant changes into a gas phase in the second heat transfer tube 22, 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, according to the heat exchanger 10 of the present embodiment, the refrigerant supplied to the second header portion 53 can be used for each second heat transfer tube 22 regardless of whether the refrigerant flow rate is small or large. The variation in the amount of refrigerant introduced into the heat exchanger can be suppressed, and the performance deterioration of the heat exchanger due to the deviation of the refrigerant flow rate flowing into the heat transfer tube can be suppressed. As a result, in the air conditioner using the heat exchanger 10 of the present embodiment, the cooling performance and the heating performance are not impaired.

As a modification of the first embodiment, instead of forming the upper communication hole 62 in the vertical partition plate 70, for example, as shown in FIGS. The height may be the same height as the two header portion uppermost heat transfer tubes 24 or the height between the second header portion uppermost heat transfer tube 24 and the upper end of the second header portion 53. In this case, a gap is formed between the vertical partition plate 70 and the second header portion 53, and the gap communicates the first chamber 76 and the second chamber 77 with the upper communication portion 63 (first communication portion 61). )
Also in this way, the refrigerant introduced into the first chamber 76 sequentially moves upward in the first chamber 76 as the refrigerant continues to be supplied, and is introduced into each second heat transfer tube 22. The refrigerant that has not been introduced into the second heat transfer tube 22 is introduced into the upper portion of the second chamber 77 via the upper communication portion 63 formed at the upper portion of the vertical partition plate 70, and moves downward in the second chamber. Since it will be introduced into each second heat transfer tube 22, the occurrence of variations in the amount of refrigerant introduced into each second heat transfer tube 22 can be suppressed as described above.

Next, the heat exchanger 80 which concerns on 2nd embodiment of this invention is demonstrated with reference to FIG.9, FIG10 and FIG.11. 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.
As shown in FIGS. 9, 10, and 11, the vertical partition plate 71 of the heat exchanger 80 of the second embodiment is similar to the first embodiment in the internal space of the cylindrical second header portion 53. It arrange | positions so that the diametrical direction in a horizontal sectional view may be met. The vertical partition plate 71 is formed with an upper communication hole 62 similar to that of the first embodiment. On the other hand, in the present embodiment, the length of the vertical partition plate 71 in the horizontal direction is from the tip position of the heat transfer tube 22 to the inner peripheral surface of the second header portion 53. The upper and lower portions of each heat transfer tube 22 in the second header portion 53 are not provided with the vertical partition plate 71, and thereby the heat transfer tube side communication portion 65 (second communication portion) that allows the first chamber 76 and the second chamber 77 to communicate with each other. 64) is formed.

  Next, operations and effects when the heat exchanger 80 is used as a condenser will be described. When the heat exchanger 80 operates as a condenser during the cooling operation of the air conditioner 1, contrary to the case where the heat exchanger 80 is used as an evaporator, the first chamber 76 in the second header portion 53 from each second heat transfer tube 22 and A refrigerant is introduced into the second chamber 77. The refrigerant introduced into the first chamber 76 moves downward in the first chamber 76 and is introduced into the first header portion 52 via the connection pipe 55. The refrigerant introduced into the second chamber 77 is introduced into the first chamber 76 via the heat transfer tube side communication portion 65 formed in the vertical partition plate 71 and then into the first header portion 52 via the connection tube 55. be introduced.

  As described above, according to the heat exchanger 80 of the present embodiment, when operating as an evaporator, it is the same as in the first embodiment, but when operating as a condenser, the second heat transfer tube 22 The refrigerant introduced into the second chamber 77 does not accumulate in the second chamber 77 and is introduced into the first chamber 76 via the heat transfer tube side communication portion 65 formed in the vertical partition plate 71. It can introduce | transduce into a 1st header part via the connecting pipe 55 connected to the lower part. As a result, in the air conditioner using the heat exchanger 80 of the present embodiment, the cooling performance and the heating performance are not impaired.

  As a modification of the second embodiment, the length of the vertical partition plate 71 in the horizontal direction is the same as that of the first embodiment. For example, as shown in FIG. 12, FIG. 13 and FIG. The heat transfer tube side communication holes 66 (second communication portions 64) may be formed in portions corresponding to the upper and lower portions of the second heat transfer tubes 22 in 71 so that the first chamber 76 and the second chamber 77 communicate with each other. Also by this, the refrigerant introduced from each second heat transfer tube 22 into the second chamber 77 does not accumulate in the second chamber 77, and passes through the heat transfer tube side communication hole 66 formed in the vertical partition plate 71. It is introduced into the first chamber 76 and can be introduced into the first header portion via the connecting pipe 55 connected to the lower portion of the first chamber 76. As a result, in the air conditioner using the heat exchanger 80 of the present embodiment, the cooling performance and the heating performance are not impaired.

Next, the heat exchanger 90 which concerns on 3rd embodiment of this invention is demonstrated with reference to FIG.15, FIG16 and FIG.17. In the third 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.
As shown in FIGS. 15, 16, and 17, the vertical partition plate 72 of the heat exchanger 90 of the third embodiment is similar to the first embodiment in the internal space of the cylindrical second header portion 53. Arranged along the diameter direction in the horizontal sectional view, an upper communication hole 62 similar to the first embodiment is formed. In the present embodiment, the vertical partition plate 72 further includes the first chamber 76 and the first chamber 76 at a position lower than the second header portion lowermost heat transfer tube 25, which is a heat transfer tube located at the lowermost portion in each second heat transfer tube 22. A lower communication hole 68 (third communication portion 67) for communicating with the two chambers 77 is formed. Further, the lower communication hole 68 is formed at a position ahead of the tip of the second heat transfer tube 22, that is, on the side opposite to the connection portion between the second header portion 53 and the second heat transfer tube 22 in a horizontal sectional view. Is done.

  Next, operations and effects when the heat exchanger 90 is used as a condenser will be described. When the heat exchanger 90 operates as a condenser during the cooling operation of the air conditioner 1, contrary to the case where it is used as an evaporator, the first chamber 76 in the second header section 53 from each second heat transfer tube 22 and A refrigerant is introduced into the second chamber 77. The refrigerant introduced into the first chamber 76 moves downward in the first chamber 76 and is introduced into the first header portion 52 via the connection pipe 55. The refrigerant introduced into the second chamber 77 moves downward in the second chamber 77, and then introduced into the first chamber 76 via the lower communication hole 68 formed in the vertical partition plate 72. It is introduced into the first header portion 52 through the connecting pipe 55.

  As described above, according to the heat exchanger 90 of the present embodiment, when operating as an evaporator, it is the same as in the first embodiment, but when operating as a condenser, the second heat transfer tube 22 The refrigerant introduced into the second chamber 77 does not accumulate in the second chamber 77 and is introduced into the first chamber 76 through the lower communication hole 68 formed in the vertical partition plate 72, and is placed in the lower portion of the first chamber 76. It can introduce into a 1st header part via the connected connecting pipe 55. FIG. As a result, in the air conditioner using the heat exchanger 90 of the present embodiment, the cooling performance and the heating performance are not impaired.

As a modification of the third embodiment, for example, as shown in FIGS. 18, 19, and 20, the lower part of the vertical partition plate 72 is curved toward the first chamber 76, and the second header part lowermost heat transfer tube 25. A lower communication portion 69 (third communication portion 67) that allows the first chamber 76 and the second chamber 77 to communicate with each other may be formed further downward. In this case, the lower communication portion 69 is formed as a gap between the lower end of the vertical partition plate 72 and the lower end of the second header portion 53. Also by this, the refrigerant introduced from each second heat transfer tube 22 into the second chamber 77 does not accumulate in the second chamber 77, and the first through the lower communication portion 69 formed in the vertical partition plate 72. It can be introduced into the first header portion via the connecting pipe 55 introduced into the chamber 76 and connected to the lower portion of the first chamber 76. Further, since the lower part of the vertical partition plate 72 is curved toward the second chamber 77, the curved shape guides the flow of the refrigerant, and the refrigerant is easily introduced from the second chamber 77 into the first chamber 76. Become. As a result, in the air conditioner using the heat exchanger 90 of the present embodiment, the cooling performance and the heating performance are not impaired.
In the third embodiment, the second communication part 64 described in the second embodiment may be provided.

Next, the heat exchanger 100 which concerns on 4th embodiment of this invention is demonstrated with reference to FIG. In the fourth embodiment, the vertical partition plate has the same configuration as that of any one of the first to third embodiments. This embodiment demonstrates as a structure similar to the vertical partition plate 70 of 1st embodiment. Constituent elements 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.
In the heat exchanger 100 of the fourth embodiment, as shown in FIG. 21, the length Lp in the second header portion 53 of the second heat transfer tube 22 in the extending direction of the second heat transfer tube 22 is the second header portion. The inner diameter Di of 53 is less than half. That is, the tip position of the second heat transfer tube 22 is the same as the center position of the second header portion 53 or is closer to the connection portion side of the second header portion 53 and the second heat transfer tube 22 than the center of the second header portion 53. ing.
According to such a heat exchanger 100, when operating as an evaporator, since the length in the second header portion 53 of the second heat transfer tube 22 is short, the first chamber 76 and the first chamber 76 are connected from the connection tube 55. The refrigerant in the gas-liquid two-phase state introduced into the second chamber 77 through the upper communication hole 62 from the upper part of the first chamber 76 and the second heat transfer tubes 22 in the second chamber 77 is accumulated. The liquid phase refrigerant can be easily introduced into each second heat transfer tube. Thereby, it is possible to further suppress the variation in the flow rate of the refrigerant flowing through each second heat transfer tube 22.
As a result, the liquid phase remaining in the refrigerant changes into a gas phase in each second heat transfer tube 22, 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.

  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.

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 1st heat transfer tube
22 Second heat transfer tube
23 Fin
24 Second header section uppermost heat transfer tube 25 Second header section lowermost heat transfer tube 30 Header
40 Entrance / exit header
41 Entrance / exit partition plate
42 Lower access area
43 Upper access area
50 Return header
51 Header body
52 First header
53 Second header section
54 Folding side divider
55 Connection pipe
56 Passage
61 Series 1
62 Upper communication hole
63 Upper communication part
64 Second communication part
65 Heat transfer tube side communication part
66 Heat transfer tube side communication hole

Claims (8)

A refrigerant pipe that extends in the horizontal direction and circulates inside, and a plurality of heat transfer tubes that are arranged at intervals in the vertical direction;
A header portion which is formed in a tubular shape extending in the vertical direction, and one end of the plurality of heat transfer tubes is connected in communication with the internal space;
The header section is divided into a first chamber and a second chamber extending in a horizontal sectional view across the heat transfer tubes and an inner peripheral surface of the header portion and communicating with the heat transfer tubes. A vertical partition plate that forms a first communicating portion that allows the first chamber and the second chamber to communicate with each other at a position equal to or higher than the height of the uppermost heat transfer tube among the heat transfer tubes;
Of the first chamber and the second chamber, connected to only the first chamber, a flow passage through which the refrigerant flows,
A heat exchanger.   The heat exchanger according to claim 1, wherein the first communication portion is a communication hole formed in the vertical partition plate.   2. The heat exchanger according to claim 1, wherein the first communication part is a gap between the vertical partition plate and an upper end of the header part.   4. The vertical partition plate according to claim 1, wherein a second communication portion that connects the first chamber and the second chamber to each other is formed between the heat transfer tubes that are vertically adjacent to each other. 5. The described heat exchanger.   The said vertical partition forms the 3rd communicating part which mutually connects the said 1st chamber and the said 2nd chamber in the position below the said lowermost heat exchanger tube among the said heat exchanger tubes. The heat exchanger according to any one of 4. The lower part of the vertical partition plate is curved from the second chamber side to the first chamber side,
The heat exchanger according to claim 5, wherein the third communication part is a gap between the vertical partition plate and a lower end of the header part.   The heat exchanger according to any one of claims 1 to 6, wherein a length Lp of the heat transfer tube in the header portion in the extending direction of the heat transfer tube is not more than half of an inner diameter Di of the header portion. An air conditioner comprising the heat exchanger according to any one of claims 1 to 7.

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