JP6896160B2 - Heat exchanger and refrigeration cycle equipment equipped with it - Google Patents

Description

The present invention relates to a heat exchanger and a refrigeration cycle apparatus including the same, and more particularly to a heat exchanger having a main heat exchanger and a sub heat exchanger, and a refrigeration cycle apparatus including such a heat exchanger. It is a thing.

As the heat transfer tube, there is a heat exchanger in which a flat heat transfer tube having a flat cross-sectional shape having a flat cross-sectional shape is used. As this type of heat exchanger, for example, in the heat exchanger disclosed in Patent Document 1, the longitudinal end of the flat heat transfer tube is directly inserted into the header, and in that state, the flat transfer is performed by the brazing material. The heat pipe is joined to the header. In this heat exchanger, a header having a laminated structure in which a plurality of members are laminated is applied. The header is composed of four members, a holding member, a gap securing member, a spacer member, and a foundation member, as a plurality of members.

The holding member is a member that holds the flat heat transfer tube, and is a member that is located on the frontmost side when the flat heat transfer tube is inserted into the header. The gap securing member is a member that prevents the brazing material that has entered through the gap between the holding member and the flat heat transfer tube from reaching the flat heat transfer tube. The spacer member has a positioning function for preventing the flat heat transfer tube from being excessively inserted and blocking the flow path of the flat heat transfer tube by other members. The foundation member is a member that forms a closed space through which the refrigerant flows by covering the spacer member.

The header includes a column straddling header and a distributor header. The row straddle header is a header in which the refrigerant flows between the heat exchangers in the first row and the heat exchangers in the second row in the heat exchangers arranged in the second row. The distributor header is a header that sends the refrigerant to the heat exchanger and collects the refrigerant that has flowed from the heat exchanger. In this specification, the distributor header is simply referred to as a distributor.

Japanese Unexamined Patent Publication No. 2014-052135 (Patent No. 6123193)

In the manufacture of the heat exchanger described above, the flat heat transfer tube penetrates the holding member and the gap securing member, and the tip of the flat heat transfer tube in the longitudinal direction comes into contact with the spacer member without being inserted into the spacer member. As such, it is required to insert a flat heat transfer tube into the header.

A plurality of flat heat transfer tubes are inserted into the header. In order to manufacture a heat exchanger having the desired function, it is necessary to make all the flat heat transfer tubes inserted into the header uniform in length and insert all the flat heat transfer tubes equally into the header. The flat heat transfer tube inserted in the header is joined to the holding member by a brazing material.

On the other hand, in the manufacture of heat exchangers, the flat heat transfer tube and the header of the laminated structure have dimensional errors due to manufacturing variations and the like. In addition, the insertion length when inserting the flat heat transfer tube into the header may vary. As a result, when a part of the flat heat transfer tube is joined to the holding member without contacting the spacer member, when the flat heat transfer tube is connected to the header by the brazing material, the flat heat transfer tube and the flat heat transfer tube are used. It is assumed that the brazing material that has entered the gap securing member through the gap with the holding member will invade the flow path of the flat heat transfer tube.

The present invention has been made to solve the above problems, and one object is to provide a heat exchanger that prevents a bonding material from entering the flow path of a flat heat transfer tube. An object of the present invention is to provide a refrigeration cycle apparatus equipped with such a heat exchanger.

The first heat exchanger according to the present invention includes a plate-shaped laminate, a flat heat transfer tube, and a bonding material. The plate-shaped laminated body includes a first plate-shaped body having a first through hole formed therein, and a second plate-shaped body having a second through hole communicating with the first through hole formed and laminated on the first plate-shaped body. Also included is a third plate-like body in which a third through-hole communicating with the second through-hole is formed and laminated on the second plate-like body. The flat heat transfer tube is inserted into the first through hole, the second through hole, and the third through hole, and is connected to the plate-shaped laminate by a joining material. The first through hole has a first opening cross-sectional area. The second through hole has a second opening cross-sectional area. The second opening cross-sectional area is larger than the first opening cross-sectional area. The distance from the portion where the first plate-shaped body and the second plate-shaped body are joined to the tip of the flat heat transfer tube inserted into the third plate-shaped body is set to at least 4 mm. The flat heat transfer tube has a major axis in the first direction and a minor axis in the second direction intersecting the first direction. The flat heat transfer tube is arranged so that the second direction corresponds to the height direction. The portion of the second through hole located at the lower end in the second direction is arranged at a higher position than the portion of the third through hole located at the lower end of the second direction.

The second heat exchanger according to the present invention includes a plate-shaped laminate, a flat heat transfer tube, and a bonding material. The plate-shaped laminated body includes a first plate-shaped body having a first through hole formed therein, and a second plate-shaped body having a second through hole communicating with the first through hole formed and laminated on the first plate-shaped body. Also included is a third plate-like body in which a third through-hole communicating with the second through-hole is formed and laminated on the second plate-like body. The flat heat transfer tube is inserted into the first through hole, the second through hole, and the third through hole, and is connected to the plate-shaped laminate by a joining material. The first through hole has a first opening cross-sectional area. The second through hole has a second opening cross-sectional area. The second opening cross-sectional area is larger than the first opening cross-sectional area. The flat heat transfer tube has a major axis in the first direction and a minor axis in the second direction intersecting the first direction. The flat heat transfer tube is arranged so that the second direction corresponds to the height direction. Portion positioned in the second direction of the lower end of the second through-holes are arranged at a position higher than the portion located in the second direction of the lower end of the third through-hole.

The third heat exchanger according to the present invention includes a plate-shaped laminate, a flat heat transfer tube, and a bonding material. The plate-shaped laminated body includes a first plate-shaped body having a first through hole formed therein, and a second plate-shaped body having a second through hole communicating with the first through hole formed and laminated on the first plate-shaped body. Also included is a third plate-like body in which a third through-hole communicating with the second through-hole is formed and laminated on the second plate-like body. The flat heat transfer tube is inserted into the first through hole, the second through hole, and the third through hole, and is connected to the plate-shaped laminate by a joining material. The flat heat transfer tube has a major axis in the first direction and a minor axis in the second direction intersecting the first direction. The flat heat transfer tube is arranged so that the second direction corresponds to the height direction. The plate-like laminate is a header. The first through hole has a first opening cross-sectional area. The second through hole has a second opening cross-sectional area. The second opening cross-sectional area is larger than the first opening cross-sectional area. The first plate-shaped body is formed with a first through hole first portion and a first through hole second portion that are spaced apart from each other in the first direction as the first through hole. The second plate-shaped body is formed with a second through hole first portion and a second through hole second portion that are spaced apart from each other in the first direction as the second through hole. The third plate-shaped body is formed with the first portion of the third through hole as the third through hole. In the first communication passage that communicates the first part of the second through hole and the second part of the second through hole formed by the first part of the third through hole, the portion communicating with the first part of the second through hole and the second part A stepped portion protruding toward the upper part in the second direction is formed between the portion communicating with the second portion of the two through holes. The flat heat transfer tube is arranged at a position lower than the top of the step portion.

The refrigeration cycle device according to the present invention is a refrigeration cycle device to which the above-mentioned heat exchanger is applied.

According to the first heat exchanger according to the present invention, the flat heat transfer tube is inserted into the first through hole, the second through hole and the third through hole, and is connected to the plate-shaped laminate by a joining material. The distance from the portion where the first plate-shaped body and the second plate-shaped body are joined to the tip of the flat heat transfer tube inserted into the third plate-shaped body is set to at least 4 mm. This makes it possible to prevent the bonding material from entering the flow path of the flat heat transfer tube.

According to the second heat exchanger according to the present invention, the flat heat transfer tube is inserted into the first through hole, the second through hole and the third through hole, and is connected to the plate-shaped laminate by a joining material. .. This makes it possible to prevent the bonding material from entering the flow path of the flat heat transfer tube. Further, the portion of the first through hole located at the lower end in the second direction is arranged at a higher position than the portion of the second through hole located at the lower end of the second direction. As a result, it is possible to prevent the refrigerant and the like from staying.

According to the third heat exchanger according to the present invention, the flat heat transfer tube is inserted into the first through hole, the second through hole and the third through hole, and is connected to the plate-shaped laminate by a joining material. .. This makes it possible to prevent the bonding material from entering the flow path of the flat heat transfer tube. Further, in the first communication passage that communicates the first part of the second through hole and the second part of the second through hole, the part that communicates with the first part of the second through hole and the part that communicates with the second part of the second through hole. A step portion protruding toward the upper part in the second direction is formed between the and. As a result, it is possible to prevent the refrigerant and the like from staying in the first continuous passage.

According to the refrigeration cycle apparatus according to the present invention, by applying the heat exchanger described above, it is possible to prevent the bonding material from entering the flow path of the flat heat transfer tube, and a highly reliable refrigeration cycle apparatus can be obtained. Obtainable.

It is a figure which shows an example of the refrigerant circuit of the refrigerating cycle apparatus which concerns on each embodiment. It is a perspective view which shows an example of the outdoor heat exchanger applied to the refrigeration cycle apparatus which concerns on each embodiment. In each embodiment, it is an exploded perspective view of the outdoor heat exchanger shown in FIG. In each embodiment, it is a figure which shows an example of the flow of the refrigerant in the outdoor heat exchanger shown in FIG. FIG. 5 is a partial cross-sectional view of the outdoor heat exchanger according to the first embodiment, including a column straddling header at the cross-sectional line VV shown in FIG. FIG. 5 is a partial cross-sectional view showing an example of an assembly procedure in the same embodiment. It is a partial cross-sectional view including the column straddle header of the outdoor heat exchanger which concerns on a comparative example. It is a partial cross-sectional view which shows an example of the assembly procedure of the outdoor heat exchanger which concerns on a comparative example. FIG. 5 is a partial cross-sectional view taken along the cross-sectional line IX-IX shown in FIG. 5 of the outdoor heat exchanger according to the second embodiment. In the same embodiment, it is a partial cross-sectional view taken along the cross-sectional line XX shown in FIG. In the same embodiment, it is a partial cross-sectional perspective view of a portion where the first flat heat transfer tube is inserted into the third plate-shaped body. It is a partial cross-sectional view which shows the row straddle head of the outdoor heat exchanger which concerns on a comparative example. It is a partial cross-sectional view for demonstrating the problem of the row straddle head of the outdoor heat exchanger which concerns on a comparative example. It is a partial cross-sectional view for demonstrating the effect of the row straddle head of an outdoor heat exchanger in the same embodiment. It is a partial cross-sectional view including the main heat exchange distributor in the cross-sectional line XV-XV shown in FIG. 2 of the outdoor heat exchanger according to the third embodiment. In the same embodiment, it is a partial cross-sectional view of the portion where the first flat heat transfer tube is inserted into the third plate-shaped body. In the same embodiment, it is a partial cross-sectional view including a main heat exchange distributor in the cross-sectional line corresponding to the cross-sectional line XV-XV shown in FIG. 2 of the outdoor heat exchanger according to the modified example.

First, an example of the overall configuration (refrigerant circuit) of the refrigeration cycle apparatus to which the heat exchanger according to each embodiment is applied will be described.

As shown in FIG. 1, the refrigeration cycle device 1 includes a compressor 3, an indoor heat exchanger 5, an indoor fan 6, an expansion valve 7, an outdoor heat exchanger 9, an outdoor fan 13, and a four-way valve 15. The compressor 3, the indoor heat exchanger 5, the expansion valve 7, the outdoor heat exchanger 9, and the four-way valve 15 are connected by a refrigerant pipe 16.

Next, the outdoor heat exchanger 9 will be described as an example of the heat exchanger according to each embodiment. As shown in FIGS. 2 and 3, the outdoor heat exchanger 9 includes a main heat exchange unit 11 and a sub heat exchange unit 12. The main heat exchange unit 11 is arranged on the sub heat exchange unit 12. A first flat heat transfer tube 17 is arranged in the main heat exchange section 11. A second flat heat transfer tube 19 is arranged in the secondary heat exchange section 12.

The main heat exchange unit 11 includes a main heat exchange unit 11a and a main heat exchange unit 11b. The sub-heat exchange unit 12 includes a sub-heat exchange unit 12a and a sub-heat exchange unit 12b. The main heat exchange unit 11a and the sub heat exchange unit 12a are arranged on the leeward side, and the main heat exchange unit 11b and the sub heat exchange unit 12b are arranged on the leeward side.

A first flat heat transfer tube 17a is arranged as a first flat heat transfer tube 17 (flat heat transfer tube first part) in the main heat exchange section 11a. A first flat heat transfer tube 17b is arranged as a first flat heat transfer tube 17 (flat heat transfer tube second part) in the main heat exchange section 11b. A second flat heat transfer tube 19a is arranged as the second flat heat transfer tube 19 in the secondary heat exchange section 12a. A second flat heat transfer tube 19b is arranged as the second flat heat transfer tube 19 in the secondary heat exchange section 12b. The first flat heat transfer tube 17 (17a, 17b) and the second flat heat transfer tube 19 (19a, 19b) have a flat cross-sectional shape having a major axis and a minor axis.

In the main heat exchange section 11a (11b), for example, eight first flat heat transfer tubes 17a (17b) are arranged at intervals in the minor axis direction. Further, in the main heat exchange section 11a (11b), the first flat heat transfer tube 17a and the first flat heat transfer tube 17b are arranged at intervals in the major axis direction.

In the secondary heat exchange section 12a (12b), for example, four second flat heat transfer tubes 19a (19b) are arranged at intervals in the minor axis direction. Further, in the secondary heat exchange section 12a (12b), the second flat heat transfer tube 19a and the second flat heat transfer tube 19b are arranged at intervals in the major axis direction. Here, the major axis direction is the X direction, and the minor axis direction is the Z direction.

In the outdoor heat exchanger 9, the main heat exchange distributor 23 is connected to one end side of the first flat heat transfer tube 17 in the longitudinal direction, and the secondary heat exchange is connected to one end side of the second flat heat transfer tube 19 in the longitudinal direction. The distributor 25 is connected. A row straddling header 21 is connected to the other end side of the first flat heat transfer tube 17 in the longitudinal direction and the other end side of the second flat heat transfer tube 19 in the longitudinal direction.

A main heat exchange distributor 23a is connected as a main heat exchange distributor 23 to one end side of the eight first flat heat transfer tubes 17a of the main heat exchange portion 11a in the longitudinal direction. A main heat exchange distributor 23b is connected as a main heat exchange distributor 23 to one end side of the eight first flat heat transfer tubes 17b of the main heat exchange portion 11b in the longitudinal direction. A sub-heat exchange distributor 25a is connected as a sub-heat exchange distributor 25 to one end side of the four second flat heat transfer tubes 19a of the sub-heat exchange portion 12a in the longitudinal direction. A sub-heat exchange distributor 25b is connected as a sub-heat exchange distributor 25 to one end side of the four second flat heat transfer tubes 19b of the sub-heat exchange portion 12b in the longitudinal direction.

An inflow / outflow pipe 27a is attached to the main heat exchange distributor 23a. A refrigerant pipe 16 is connected to the inflow / outflow pipe 29a. The refrigerant pipe 16 is connected to the compressor 3 (four-way valve 15). An inflow / outflow pipe 27b is attached to the secondary heat exchange distributor 25a. A refrigerant pipe 16 is connected to the inflow / outflow pipe 27b. The refrigerant pipe 16 is connected to the expansion valve 7. The main heat exchange distributor 23b and the sub heat exchange distributor 25b are connected by a refrigerant pipe 29.

A sub-heat exchange distributor 25a is connected as a sub-heat exchange distributor 25 to one end side of the four second flat heat transfer tubes 19a of the sub-heat exchange portion 12a in the longitudinal direction. A sub-heat exchange distributor 25b is connected as a sub-heat exchange distributor 25 to one end side of the four second flat heat transfer tubes 19b of the sub-heat exchange portion 12b in the longitudinal direction.

The row straddling header 21 connects the other end side of the eight first flat heat transfer tubes 17a and the other end side of the eight first flat heat transfer tubes 17b. Further, the row straddling header 21 connects the other end side of the four second flat heat transfer tubes 19a and the other end side of the four second flat heat transfer tubes 19b. In the row straddling header 21, the first flat heat transfer tube 17a and the first flat heat transfer tube 17b located in the same number of stages are connected, and the second flat heat transfer tube 19a and the second flat heat transfer tube 19b located in the same number of stages, respectively. Is connected.

Next, as the operation of the refrigeration cycle device 1 described above, first, the case of the heating operation will be described. By driving the compressor 3, a high-temperature and high-pressure gas refrigerant is discharged from the compressor 3. The discharged high-temperature and high-pressure gas refrigerant (single-phase) flows into the indoor heat exchanger 5 via the four-way valve 15. In the indoor heat exchanger 5, heat exchange is performed between the gas refrigerant that has flowed in and the air supplied by the indoor fan 6. The high-temperature and high-pressure gas refrigerant condenses into a high-pressure liquid refrigerant (single-phase). This heat exchange heats the room. The high-pressure liquid refrigerant sent out from the indoor heat exchanger 5 becomes a two-phase state refrigerant of a low-pressure gas refrigerant and a liquid refrigerant by the expansion valve 7.

The two-phase refrigerant flows into the outdoor heat exchanger 9. The outdoor heat exchanger 9 functions as an evaporator. In the outdoor heat exchanger 9, heat exchange is performed between the flowing two-phase refrigerant and the air supplied by the outdoor fan 13. Of the two-phase refrigerants, the liquid refrigerant evaporates to become a low-pressure gas refrigerant (single-phase). The low-pressure gas refrigerant sent out from the outdoor heat exchanger 9 flows into the compressor 3 via the four-way valve 15. The low-pressure gas refrigerant that has flowed into the compressor 3 is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 3 again. Hereinafter, this cycle is repeated.

Next, the case of cooling operation will be described. By driving the compressor 3, a high-temperature and high-pressure gas refrigerant is discharged from the compressor 3. The discharged high-temperature and high-pressure gas refrigerant (single-phase) flows into the outdoor heat exchanger 9 via the four-way valve 15. The outdoor heat exchanger 9 functions as a condenser. In the outdoor heat exchanger 9, heat exchange is performed between the flowing refrigerant and the air supplied by the outdoor fan 13. The high-temperature and high-pressure gas refrigerant condenses into a high-pressure liquid refrigerant (single-phase).

The high-pressure liquid refrigerant sent out from the outdoor heat exchanger 9 becomes a two-phase refrigerant of a low-pressure gas refrigerant and a liquid refrigerant by the expansion valve 7. The two-phase refrigerant flows into the indoor heat exchanger 5. In the indoor heat exchanger 5, heat exchange is performed between the flowing two-phase refrigerant and the air supplied by the indoor fan 6. In the two-phase state refrigerant, the liquid refrigerant evaporates to become a low-pressure gas refrigerant (single-phase). This heat exchange cools the room. The low-pressure gas refrigerant sent out from the indoor heat exchanger 5 flows into the compressor 3 via the four-way valve 15. The low-pressure gas refrigerant that has flowed into the compressor 3 is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 3 again. Hereinafter, this cycle is repeated.

Next, the flow of the refrigerant in the outdoor heat exchanger 9 will be described. Here, the case of heating operation will be described as an example. In this case, the outdoor heat exchanger 9 functions as an evaporator. A two-phase refrigerant is sent from the expansion valve 7 to the outdoor heat exchanger 9.

As shown in FIGS. 3 and 4, the two-phase refrigerant first flows into the auxiliary heat exchange distributor 25a. The flowing refrigerant is branched into four and flows through each of the four corresponding second flat heat transfer tubes 19a arranged in the auxiliary heat exchange portion 12a. The refrigerant flowing through each of the second flat heat transfer tubes 19a flows through the column straddling header 21 and flows through each of the four corresponding second flat heat transfer tubes 19b arranged in the auxiliary heat exchange section 12b. The refrigerant flowing through each of the four second flat heat transfer tubes 19b flows into the auxiliary heat exchange distributor 25b and merges.

The combined refrigerant flows through the refrigerant pipe 29 and flows into the main heat exchange distributor 23b. The flowing refrigerant is branched into eight and flows through each of the corresponding eight first flat heat transfer tubes 17b arranged in the main heat exchange portion 11b. The refrigerant flowing through each of the first flat heat transfer tubes 17b flows through the column straddling header 21 and flows through each of the eight corresponding first flat heat transfer tubes 17a arranged in the main heat exchange section 11a. The refrigerant flowing through each of the eight first flat heat transfer tubes 17a flows into the main heat exchange distributor 23a and merges. The refrigerant that has flowed into the main heat exchange distributor 23a is sent to the compressor 3 via the four-way valve 15. In the case of the cooling operation, the flow of the refrigerant is opposite to that in the case of the heating operation. The refrigerating cycle device 1 can be applied to, for example, a heat pump device, a hot water supply device, a refrigerating device, or the like.

In the outdoor heat exchanger 9, the row straddle header 21, the main heat exchange distributor 23, and the sub heat exchange distributor 25 are formed by a plate-shaped laminate 30 in which plate-shaped bodies are laminated. Hereinafter, the outdoor heat exchanger 9 provided with the plate-shaped laminate 30 will be specifically described.

Embodiment 1.
Here, an example of an outdoor heat exchanger in which the row straddle header 21 is formed of a plate-shaped laminate 30 will be described.

As shown in FIG. 5, the row straddle header 21 formed from the plate-shaped laminated body 30 is formed from the first plate-shaped body 31, the second plate-shaped body 32, the third plate-shaped body 33, and the fourth plate-shaped body 34. It is formed. In the first plate-shaped body 31, a through hole 31a is formed as a first through hole first portion, and a through hole 31b is formed as a first through hole second portion. The through hole 31a and the through hole 31b are formed so as to be spaced apart from each other in the major axis direction of the first flat heat transfer tubes 17a and 17b. The thickness (length LA) of the first plate-shaped body 31 is, for example, about 3 mm.

In the second plate-shaped body 32, a through hole 32a is formed as the first part of the second through hole, and a through hole 32b is formed as the second part of the second through hole. The second plate-shaped body 32 is laminated on the first plate-shaped body 31. The through hole 32a and the through hole 32b are formed so as to be spaced apart from each other in the major axis direction of the first flat heat transfer tubes 17a and 17b. The opening cross-sectional area of each of the through hole 32a and the through hole 32b as the second opening cross-sectional area is set to be larger than the opening cross-sectional area of each of the through hole 31a and the through hole 31b as the first opening cross-sectional area.

The length (X direction) from the outer wall portion of the first flat heat transfer tubes 17a and 17b to the wall surface of the through holes 32a and 32b is, for example, about 2 mm. The thickness (Y direction) of the second plate-shaped body 32 is, for example, about 2 mm. A cavity 53 is formed between the outer wall portions of the first flat heat transfer tubes 17a and 17b and the wall surfaces of the through holes 32a and 32b.

A through hole 33a is formed in the third plate-shaped body 33 as the first portion of the third through hole 33. The third plate-shaped body 33 is laminated on the second plate-shaped body 32. The thickness (Y direction) of the third plate-shaped body 33 is, for example, at least about 6 mm. The fourth plate-shaped body 34 is laminated on the third plate-shaped body 33 so as to cover the through hole 33a. By stacking the fourth plate-shaped body 34 on the third plate-shaped body 33, the through hole 33a of the third plate-shaped body 33 connects the first flat heat transfer tube 17a and the first flat heat transfer tube 17b. It becomes a continuous passage 55 as a continuous passage. The thickness (Y direction) of the fourth plate-shaped body 34 is, for example, about 3 mm.

As shown in FIG. 6, in the row straddling header 21, the first flat heat transfer tube is used as the first flat heat transfer tube from the through hole 31a of the first plate-shaped body 31 toward the through hole 33a of the third plate-shaped body 33. 17a is inserted. The first flat heat transfer tube 17b is inserted as the second part of the flat heat transfer tube from the through hole 31b of the first plate-shaped body 31 toward the through hole 33a of the third plate-shaped body 33.

The first flat heat transfer tubes 17a and 17b are connected to the plate-shaped laminate 30 (row straddling header) by the brazing material 50. When the first flat heat transfer tubes 17a and 17b and the plate-shaped laminate 30 are connected by the brazing material 50, from the gap between the first flat heat transfer tubes 17a and 17b and the through holes 31a and 31b of the first plate-shaped body 31. The brazing material 50 that has entered will be stored in the cavity 53.

In the row straddling header 21 of the outdoor heat exchanger 9 described above, the first flat heat transfer tubes 17a and 17b inserted into the first plate-shaped body 31, the second plate-shaped body 32 and the third plate-shaped body 33 are at desired positions. By being arranged in a relationship, it is possible to prevent the brazing material 50 from invading the flow path 18 of the first flat heat transfer tubes 17a, 17b and the like. This will be described in comparison with the outdoor heat exchanger according to the comparative example.

As shown in FIG. 7, the row straddling head 121 formed from the plate-shaped laminated body 130 in the outdoor heat exchanger according to the comparative example has a first plate-shaped body 131, a second plate-shaped body 132, and a third plate-shaped body. It is formed from 133 and a fourth plate-like body 134. A through hole 131a and a through hole 131b are formed in the first plate-shaped body 31. A through hole 132a and a through hole 132b are formed in the second plate-shaped body 132. A through hole 133a is formed in the third plate-shaped body 133.

As shown in FIG. 8, the first flat heat transfer tubes 117a and 117b are inserted through the through holes 131a and 131b of the first plate-shaped body 131. At this time, the first flat heat transfer tubes 117a and 117b are inserted so that the tips of the first flat heat transfer tubes 117a and 117b come into contact with the third plate-shaped body 133.

However, the first flat heat transfer tubes 117a and 117b and the column straddling header 121 having a laminated structure have dimensional errors due to manufacturing variations and the like. Further, when the first flat heat transfer tubes 117a and 117b are inserted into the column straddling header 121, the insertion length may vary and LT (see FIG. 7) may occur.

Therefore, as shown in FIG. 7, a part of the first flat heat transfer tube 117a may be fixed to the row straddle header 121 without contacting the third plate-shaped body 133. In such a case, the length from the first plate-shaped body 131 to the tip of the first flat heat transfer tube 117a is longer than that in the case where the first flat heat transfer tube 117b is in contact with the third plate-shaped body 133. It will be shorter. Therefore, when joining with the brazing material, the brazing material 150 that has entered through the gap between the first flat heat transfer tube 117a and the first plate-shaped body 131 invades the flow path 118 of the first flat heat transfer tube 117a. Is assumed.

In contrast to the outdoor heat exchanger according to the comparative example, in the row straddling header 21 of the outdoor heat exchanger 9 described above, first, the first plate-shaped body 31, the second plate-shaped body 32, the third plate-shaped body 33, and the third plate-shaped body 33 are used. The thickness of each of the four plate-shaped bodies 34 is set to a desired magnitude relationship. Further, the first flat heat transfer tubes 17a and 17b (second flat heat transfer tubes 19a and 19b) pass through the through holes 31a and 31b of the first plate-shaped body 31 and the through holes 32a and 32b of the second plate-shaped body 32. It is inserted up to the through hole 33a of the third plate-shaped body 33.

As shown in FIG. 5, the length (Y direction) corresponding to the thickness of the first plate-shaped body 31 is penetrated from the portion where the length LA and the first plate-shaped body 31 and the second plate-shaped body are joined. The length (Y direction) of the first flat heat transfer tubes 17a and 17b inserted into the holes 33a to the tips in the longitudinal direction is the length LB, and the fourth plate from the tips of the first flat heat transfer tubes 17a and 17b in the longitudinal direction. The length up to the shape 34 (in the Y direction) is defined as the length LC. The length LA, the length LB, and the length LC have a relationship of length LB ≧ length LC ≧ length LA. Further, the first flat heat transfer tubes 17a and 17b are inserted so that the length LB has a length LB ≧ 4 mm.

When the first flat heat transfer tubes 17a and 17b are connected to the row straddling header 21 by the brazing material, the brazing material 50 is formed between the first flat heat transfer tubes 17a and 17b and the through holes 31a and 31b of the first plate-shaped body 31. It invades the cavity 53 through the gap. A wax pool (fillet) is formed in the cavity 53 by the brazing material 50 that has entered the cavity 53. The size of the wax pool can be accommodated in a thickness of about 2 mm (Y direction) at the maximum if the amount of the brazing material is properly controlled.

On the other hand, the variation LT in the length of inserting the first flat heat transfer tubes 17a and 17b into the through hole 33a of the third plate-shaped body 33 can be controlled within ± 1 mm. From this, by setting the length LB to the length LB ≧ 4 mm, it is possible to prevent the brazing material 50 from invading the flow path 18 of the first flat heat transfer tubes 17a and 17b.

Further, from the tips of the first flat heat transfer tubes 17a and 17b inserted into the third plate-shaped body 33 in order to secure the communication passage 55 between the first flat heat transfer tube 17a and the first flat heat transfer tube 17b. The length LC up to the fourth plate-shaped body 34 is preferably length LC ≥ length LA. Further, in order to secure the cavity 53 of the wax pool and ensure that the first flat heat transfer tubes 17a and 17b are inserted into the through hole 33a of the third plate-shaped body 33, the length LB is the length LB ≧ length. It is preferably LC. Therefore, it is preferable that the length LB ≧ length LC ≧ length LA and the length LB ≧ 4 mm.

In the row-straddling header 21 of the outdoor heat exchanger 9 described above, each of the first plate-shaped body 31, the second plate-shaped body 32, and the third plate-shaped body 33 is formed by one plate-shaped member. The case has been described as an example. As the row straddling header 21, at least one of the first plate-shaped body 31, the second plate-shaped body 32, and the third plate-shaped body 33 may be a row straddling header formed by a plurality of plate-shaped bodies. Further, the row straddling header 21 of the sub heat exchange portions 12a and 12b also has the same structure as the row straddling header of the main heat exchange portions 11a and 11b.

Embodiment 2.
Here, another example of an outdoor heat exchanger in which the row straddle header 21 is formed of a plate-shaped laminate 30 will be described.

As shown in FIGS. 9 and 10, in the row straddling header 21, a communication passage 55 for the refrigerant is formed by the through hole 33a of the third plate-shaped body 33. The communication passage 55 includes a flow path 55a and a flow path 55b. The flow path 55a is located at a portion where the first flat heat transfer tube 17a and the first flat heat transfer tube 17b are inserted into the third plate-shaped body 33, respectively. The flow path 55b is located between the flow path 55a on the first flat heat transfer tube 17a side and the flow path 55a on the first flat heat transfer tube 17b side. A step 33b (Z direction) is provided between the flow path 55a on the first flat heat transfer tube 17a side and the flow path 55a on the first flat heat transfer tube 17b side. Further, as shown in FIGS. 9 and 11, the first flat heat transfer tubes 17a and 17b are arranged at positions lower than the top (Z direction) of the step 33b.

The position of the bottom (Z direction) of the cavity 53 is set higher than the position of the bottom (Z direction) of the flow path 55a. Assuming that the height of the cavity 53 (Z direction) is the height WF and the height of the flow path 55a (Z direction) is the height WS, the height relationship may be height WF ≥ height WS. However, the height WF ≤ height WS may be satisfied. Since the other configurations are the same as those of the column straddling header 21 shown in FIG. 5 and the like, the same members are designated by the same reference numerals, and the description thereof will not be repeated unless necessary.

In the above-described outdoor heat exchanger row straddling header 21, in addition to the effect of preventing the brazing material 50 from entering the flow path 18 of the first flat heat transfer tube 17b, as described in the first embodiment. Therefore, the following effects can be obtained. In the row-straddling header 21 of the outdoor heat exchanger described above, a step 33b is provided between the flow path 55a on the first flat heat transfer tube 17a side and the flow path 55a on the first flat heat transfer tube 17b side. It is possible to suppress the retention of the refrigerant and the like. This will be described in comparison with the cross-row header of the outdoor heat exchanger according to the comparative example.

As shown in FIG. 12, in the row straddling header 121 of the outdoor heat exchanger according to the comparative example, the refrigerant communication passage 155 is formed by the through hole 133a of the third plate-shaped body 133. In the communication passage 155, the bottom of the communication passage 155 is at the same height (Z direction) from the portion where the first flat heat transfer tube 117a is inserted to the portion where the first flat heat transfer tube 117b is inserted.

For example, when the outdoor heat exchanger functions as an evaporator (heating operation), the refrigerant flows through the first flat heat transfer tube 117b in the main heat exchange section where the first flat heat transfer tubes 117a and 117b are arranged. After that, it flows through the first flat heat transfer tube 117a through the row straddling header 121. At this time, as shown in FIG. 13, the refrigerant sent from the flow path 118 of the first flat heat transfer tube 117b to the column straddling header 121 flows through the communication passage 155 and flows into the flow path 118 of the first flat heat transfer tube 117a. ..

Since the refrigerating machine oil used in the compressor is mixed in the refrigerant, the refrigerating machine oil flows into the communication passage 155 together with the refrigerant in the row straddle header 121. In the case of incompatible refrigerating machine oil, the refrigerating machine oil stays at a position lower than the position of the flow path 118 of the first flat heat transfer tubes 117a and 117b in the communication passage 155, and stays in the communication passage without resisting gravity. At 155, a film of refrigerating machine oil that continues to stay is formed. Therefore, it is assumed that the refrigerating machine oil of the compressor will be reduced or depleted, which will cause a failure of the refrigerating cycle device. On the other hand, if an attempt is made to fill the refrigerating machine oil in an attempt to avoid such a decrease in the refrigerating machine oil, it contributes to an increase in cost.

In contrast to the outdoor heat exchanger according to the comparative example, in the row straddling header 21 of the outdoor heat exchanger according to the second embodiment, the refrigerant communication passage 55 formed by the through hole 33a of the third plate-shaped body 33 is A step 33b (Z direction) is provided between the flow path 55a on the first flat heat transfer tube 17a side and the flow path 55a on the first flat heat transfer tube 17b side, including the flow path 55a and the flow path 55b. .. The first flat heat transfer tubes 17a and 17b are arranged at positions lower than the top (Z direction) of the step 33b.

In the flow path 55a of the portion where the first flat heat transfer tube 17b is inserted, the side wall surface of the through hole 33a and the side wall surface of the step 33b are located at intervals in the X direction. Further, the through hole 33a serving as the communication passage 55 is covered with the fourth plate-shaped body 34 (see FIG. 10). Therefore, as shown in FIG. 14, the refrigerant sent from the flow path 18 of the first flat heat transfer tube 17b to one of the flow paths 55a collides with the fourth plate-shaped body 34 and is upward (Z-axis positive). It tries to flow separately in the direction (direction) and downward (negative direction of the Z axis).

In particular, the refrigerant that is about to flow downward disturbs the refrigerating machine oil and the refrigerant mixed with the refrigerating machine oil that has accumulated near the bottom of one of the flow paths 55a, while disturbing the side wall surface of the through hole 33a and the side of the step 33b. It rises along the wall surface and flows into the flow path 55b. The refrigerant and refrigerating machine oil that have flowed into the flow path 55b flow into the other flow path 55a of the portion where the first flat heat transfer tube 17a is inserted, and then flow through the flow path 18 of the first flat heat transfer tube 17a. ..

As a result, the refrigerant and the refrigerating machine oil that are to stay in one of the flow paths 55a are sent to the flow path 18 of the first flat heat transfer tube 17a via the flow path 55b, and the refrigerant and the refrigerating machine oil stay in the communication passage 55. Can be suppressed. As a result, it is possible to suppress a failure due to a decrease in refrigerating machine oil, and it is not necessary to fill an extra refrigerant or refrigerating machine oil, which can contribute to improvement of reliability and cost reduction.

Further, as shown in FIG. 10, in the above-mentioned row straddling header 21, the position of the bottom (Z direction) of the cavity 53 is set higher than the position of the bottom (Z direction) of the flow path 55a. As a result, the refrigerant or refrigerating machine oil that tends to stay in the cavity 53 can be dropped into the communication passage 55 (flow path 55a), which can contribute to suppressing the retention of the refrigerant or refrigerating machine oil.

Embodiment 3.
Here, the outdoor heat exchanger in which the distributor is formed of the plate-shaped laminate 30 will be described by taking the main heat exchange distributor as an example.

As shown in FIGS. 2 and 15, the main heat exchange distributor 23 (23b) formed from the plate-shaped laminate 30 is a first plate-shaped body 31, a second plate-shaped body 32, and a third plate-shaped body. It is formed of 33, a fifth plate-shaped body 35, a sixth plate-shaped body 36, a seventh plate-shaped body 37, an eighth plate-shaped body 38, and a ninth plate-shaped body 39.

A first flat heat transfer tube 17b is inserted into the first plate-shaped body 31, the second plate-shaped body 32, and the third plate-shaped body 33. The structure of the portion where the first flat heat transfer tube 17b is inserted has the same structure as that of one row of the row straddle header 21 (see FIGS. 2 and 5). In the first plate-shaped body 31, a through hole 31c is formed as a first through hole third portion, and a through hole 31d is formed as a first through hole fourth portion. The through hole 31c and the through hole 31d are formed so as to be spaced apart from each other in the minor axis direction of the first flat heat transfer tube 17b.

In the second plate-shaped body 32, a through hole 32c is formed as a second through hole third portion, and a through hole 32d is formed as a second through hole fourth portion. The second plate-shaped body 32 is laminated on the first plate-shaped body 31. The through hole 32c and the through hole 32d are formed so as to be spaced apart from each other in the minor axis direction of the first flat heat transfer tube 17a. The opening cross-sectional area of the through holes 32c and 32d as the second opening cross-sectional area is set to be larger than the opening cross-sectional area of the through holes 31c and 31d as the first opening cross-sectional area.

In the third plate-shaped body 33, a through hole 33c is formed as a third through hole third portion, and a through hole 33d is formed as a third through hole fourth portion. The through hole 33c and the through hole 33d are formed so as to be spaced apart from each other in the minor axis direction of the first flat heat transfer tube 17b. The third plate-shaped body 33 is laminated on the second plate-shaped body 32.

In the fifth plate-shaped body 35, a through hole 35a is formed as the first part of the fourth through hole, and a through hole 35b is formed as the second part of the fourth through hole. The through hole 35a and the through hole 35b are formed so as to be spaced apart from each other in the minor axis direction of the first flat heat transfer tube 17b. The fifth plate-shaped body 35 is laminated on the third plate-shaped body 33. By stacking the fifth plate-shaped body 35 on the third plate-shaped body 33, the through hole 33c is formed as the flow path 55c, and the through hole 33d is formed as the flow path 55d.

As shown in FIGS. 15 and 16, the through hole 35a is preferably located below the top of the first flat heat transfer tube 17b and communicates with the lower end portion of the flow path 55c. Similarly, it is preferable that the through hole 35b communicates with the lower end portion of the flow path 55d.

A through hole 36a is formed in the sixth plate-shaped body 36. The sixth plate-shaped body 36 is laminated on the fifth plate-shaped body 35. The seventh plate-shaped body 37 is formed with a through hole 37a communicating with the communication passage 56. The seventh plate-shaped body 37 is laminated on the sixth plate-shaped body 36. By stacking the 7th plate-shaped body 37 on the 6th plate-shaped body 36, the through hole 36a is formed as a continuous passage 56 as a second continuous passage. The communication passage 56 communicates with the through hole 35a and the through hole 35b. The eighth plate-shaped body 38 is formed with a through hole 38a communicating with the through hole 37a. The eighth plate-shaped body 38 is laminated on the seventh plate-shaped body 37.

The ninth plate-shaped body 39 is formed with a through hole 39a communicating with the through hole 38a. The ninth plate-shaped body 39 is laminated on the eighth plate-shaped body 38. By laminating the ninth plate-shaped body 39 on the eighth plate-shaped body, the through hole 38a is formed as the communication passage 57. The communication passage 57 communicates with the through hole 37a and the like.

Next, as an example of the operation of the outdoor heat exchanger described above, there is a case where the outdoor heat exchanger 9 functions as an evaporator (heating operation). FIG. 15 also shows the flow of the refrigerant in the main heat exchange distributor 23b connected to the main heat exchange unit 11b when the outdoor heat exchanger 9 functions as an evaporator. As shown in FIGS. 2 and 15, the refrigerant that has flowed through the refrigerant pipe 29 flows into the communication passage 57 through the through hole 39a. The refrigerant that has flowed into the communication passage 57 flows into the communication passage 56 through the through hole 37a.

The refrigerant that has flowed into the communication passage 56 flows into the flow path 55c through the through hole 35a and also flows into the flow path 55d through the through hole 35b. In this way, the refrigerant is distributed. The refrigerant that has flowed into the flow path 55c flows through the flow path 18 of the first flat heat transfer tube 17b, and the refrigerant that has flowed into the flow path 55d flows through the flow path 18 of the first flat heat transfer tube 17b.

In the main heat exchange distributor 23b of the outdoor heat exchanger described above, the brazing material 50 is prevented from entering the flow path 18 of the first flat heat transfer tube 17b, as described in the first embodiment. In addition to the effects that can be obtained, the following effects can be obtained. The through hole 35a is located below the top of the first flat heat transfer tube 17b and communicates with the lower end portion of the flow path 55c. As a result, the refrigerant sent from the through hole 35a diffuses the refrigerant or refrigerating machine oil that tends to stay in the flow path 55c, and easily flows into the flow path 18 of the first flat heat transfer tube 17b.

When the outdoor heat exchanger 9 functions as a condenser (cooling operation), the refrigerant or refrigerating machine oil sent out from the first flat heat transfer tube 17b is affected by gravity in the flow path 55c. Even if it stays at the lower end portion, it easily flows into the communication passage 56 through the through hole 35a that communicates at the same height as the lower end portion of the flow path 55c. As a result, it is possible to suppress the retention of the refrigerant or the refrigerating machine oil, and it is possible to avoid the failure of the compressor.

(Modification example)
In the main heat exchange distributor 23b of the outdoor heat exchanger described above, the case where the through holes 35a and 35b communicate with the lower end portions of the flow paths 55c and 55d has been described as an example. The positions of the through holes 35a and 35b do not necessarily have to communicate with the lower end portions of the flow paths 55c and 55d, and as shown in FIG. 17, for example, in consideration of symmetry in the Z direction, the through holes 35a and 35b penetrate. The hole 35b may communicate with the upper end portion of the flow path 55d. Even in such a case, since there is a portion where the through hole 35a communicates with the lower end portion of the flow path 55c, the effect of suppressing the retention of the refrigerant or the refrigerating machine oil can be obtained.

The outdoor heat exchangers described in each embodiment can be combined in various ways as needed.

The embodiments disclosed this time are examples and are not limited thereto. The present invention is shown by the claims, not the scope described above, and is intended to include all modifications in the sense and scope equivalent to the claims.

(Additional note)
Embodiments 1 to 3 include the following aspects.

(Appendix 1)
A first plate-like body in which a first through hole is formed, a second plate-like body in which a second through hole communicating with the first through hole is formed and laminated on the first plate-like body, and the first plate-like body. A plate-like laminate including a third plate-like body in which a third through-hole communicating with the two through-holes is formed and laminated on the second plate-like body,
A flat heat transfer tube inserted into the first through hole, the second through hole, and the third through hole and connected to the plate-shaped laminate by a joining material is provided.
The first through hole has a first opening cross-sectional area and
The second through hole has a second opening cross-sectional area and has a second opening cross-sectional area.
The second opening cross-sectional area is larger than the first opening cross-sectional area.
The length from the portion where the second plate-shaped body and the third plate-shaped body are joined to the tip of the flat heat transfer tube inserted into the third plate-shaped body is the third plate-shaped body. A heat exchanger set to a length equivalent to at least half the thickness of the heat exchanger.

(Appendix 2)
A first plate-like body in which a first through hole is formed, a second plate-like body in which a second through hole communicating with the first through hole is formed and laminated on the first plate-like body, and the first plate-like body. A plate-like laminate including a third plate-like body in which a third through-hole communicating with the two through-holes is formed and laminated on the second plate-like body,
A flat heat transfer tube inserted into the first through hole, the second through hole, and the third through hole and connected to the plate-shaped laminate by a joining material is provided.
The first through hole has a first opening cross-sectional area and
The second through hole has a second opening cross-sectional area and has a second opening cross-sectional area.
The second opening cross-sectional area is larger than the first opening cross-sectional area.
The length corresponding to the thickness of the first plate-shaped body is defined as the length LA.
The length from the portion where the first plate-shaped body and the second plate-shaped body are joined to the tip of the flat heat transfer tube inserted into the third plate-shaped body is defined as the length LB.
Assuming that the length from the flat heat transfer tube to the opening end of the third through hole is the length LC,
The length LB ≧ the length LC ≧ the length LA,
Is a heat exchanger.

The present invention is effectively used in a heat exchanger provided with a main heat exchange section and a sub heat exchange section.

1 Refrigeration cycle device, 3 Compressor, 5 Indoor heat exchanger, 6 Indoor fan, 7 Expansion valve, 9 Outdoor heat exchanger, 11, 11a, 11b Main heat exchange part, 12, 12a, 12b Secondary heat exchange part, 13 Outdoor fan, 15 four-way valve, 16 refrigerant pipe, 17, 17a, 17b 1st flat heat transfer tube, 18 flow path, 19, 19a, 19b 2nd flat heat transfer tube, 21-row straddle header, 23, 23a Distribution for main heat exchanger Vessel, 23b Main heat exchanger distributor, 25, 25a Secondary heat exchanger distributor, 25b Secondary heat exchanger distributor, 27a Inflow / outflow pipe, 27b Outflow / inflow pipe, 29 Refrigerator pipe, 30 Plate-shaped laminate, 31 First plate Shape, 31a, 31b through hole, 31c, 31d through hole, 32 second plate shape, 32a, 32b through hole, 32c, 32d through hole, 33 third plate shape, 33a through hole, 33b step, 33c, 33d through hole, 34 4th plate, 34a, 34b through hole, 35 5th plate, 35a, 35b through hole, 36 6th plate, 36a, 36b through hole, 37 7th plate, 37a, 37b through hole, 38 8th plate, 38a through hole, 39 9th plate, 39a through hole, 50 brazing material, 53 cavity, 55, 56, 57 continuous passage, 55a, 55b, 55c, 55d Channel.

Claims (10)

A first plate-like body in which a first through hole is formed, a second plate-like body in which a second through hole communicating with the first through hole is formed and laminated on the first plate-like body, and the first plate-like body. A plate-like laminate including a third plate-like body in which a third through-hole communicating with the two through-holes is formed and laminated on the second plate-like body,
A flat heat transfer tube inserted into the first through hole, the second through hole, and the third through hole and connected to the plate-shaped laminate by a joining material is provided.
The first through hole has a first opening cross-sectional area and
The second through hole has a second opening cross-sectional area and has a second opening cross-sectional area.
The second opening cross-sectional area is larger than the first opening cross-sectional area.
The distance from the portion where the first plate-shaped body and the second plate-shaped body are joined to the tip of the flat heat transfer tube inserted into the third plate-shaped body is set to at least 4 mm .
The flat heat transfer tube has a major axis in the first direction and a minor axis in the second direction intersecting the first direction.
The flat heat transfer tube is arranged so that the second direction corresponds to the height direction.
A heat exchanger in which a portion of the second through hole located at the lower end of the second direction is located higher than a portion of the third through hole located at the lower end of the second direction. The plate-shaped laminate is a column straddling header, and is
In the first plate-shaped body, as the first through hole, a first through hole first portion and a first through hole second portion separated from each other in the first direction are formed.
In the second plate-shaped body, as the second through hole, a second through hole first portion and a second through hole second portion that are spaced apart from each other in the first direction are formed.
In the third plate-shaped body, as the third through hole, the first part of the second through hole and the first part of the third through hole communicating with the second part of the second through hole are formed.
The plate-like laminate, to cover the third through-hole part 1 includes a fourth plate member that is laminated on the third plate-shaped body, the heat exchanger according to claim 1. The flat heat transfer tube is
The first part of the first through hole, the first part of the second through hole, and the first part of the flat heat transfer tube inserted into the first part of the third through hole.
The first through hole second part, the second through hole second part, and the flat heat transfer tube second part inserted into the third through hole first part are included.
The first part of the flat heat transfer tube is inserted in the first continuous passage that connects the first part of the flat heat transfer tube and the second part of the flat heat transfer tube formed by the first part of the third through hole. between the portion where the second part portion and the flat heat-transfer tubes are inserted, the step portion projecting toward the upper portion of the second direction is formed, the heat exchanger according to claim 2, wherein. The plate-shaped laminate is a distributor and
In the first plate-shaped body, as the first through hole, a first through hole third portion and a first through hole fourth portion separated by a distance in the second direction are formed.
In the second plate-shaped body, as the second through hole, a second through hole third portion and a second through hole fourth portion separated by a distance in the second direction are formed.
In the third plate-shaped body, as the third through hole, a third through hole third portion and a third through hole fourth portion separated by a distance in the second direction are formed.
The plate-shaped laminated body includes a fifth plate-shaped body in which a fourth through-hole communicating with the third through-hole is formed and laminated on the third plate-shaped body.
In the fifth plate-like body, as the fourth through hole,
The first part of the fourth through hole that communicates with the third part of the third through hole, and
A second part of the fourth through hole communicating with the fourth part of the third through hole is formed.
The plate-shaped laminated body has a sixth plate-like structure in which a second continuous passage connecting the first portion of the fourth through hole and the second portion of the fourth through hole is formed and laminated on the fifth plate-shaped body. including the body, the heat exchanger according to claim 1. Passage of the flat heat exchanger tube is located higher than the top of the second direction in the fourth through hole, the heat exchanger according to claim 4, wherein. The first part of the fourth through hole communicates with the lower part of the third through hole in the third part in the second direction.
The heat exchanger according to claim 4 , wherein the second part of the fourth through hole communicates with a lower part of the third through hole in the fourth part in the second direction. The first part of the fourth through hole communicates with the lower part of the third through hole in the third part in the second direction.
The heat exchanger according to claim 4 , wherein the second part of the fourth through hole communicates with an upper part of the third through hole in the fourth part in the second direction. A first plate-like body in which a first through hole is formed, a second plate-like body in which a second through hole communicating with the first through hole is formed and laminated on the first plate-like body, and the first plate-like body. A plate-like laminate including a third plate-like body in which a third through-hole communicating with the two through-holes is formed and laminated on the second plate-like body,
A flat heat transfer tube inserted into the first through hole, the second through hole, and the third through hole and connected to the plate-shaped laminate by a joining material is provided.
The first through hole has a first opening cross-sectional area and
The second through hole has a second opening cross-sectional area and has a second opening cross-sectional area.
The second opening cross-sectional area is larger than the first opening cross-sectional area.
The flat heat transfer tube has a major axis in the first direction and a minor axis in the second direction intersecting the first direction.
The flat heat transfer tube is arranged so that the second direction corresponds to the height direction.
A heat exchanger in which a portion of the second through hole located at the lower end of the second direction is located higher than a portion of the third through hole located at the lower end of the second direction. A first plate-like body in which a first through hole is formed, a second plate-like body in which a second through hole communicating with the first through hole is formed and laminated on the first plate-like body, and the first plate-like body. A plate-like laminate including a third plate-like body in which a third through-hole communicating with the two through-holes is formed and laminated on the second plate-like body,
A flat heat transfer tube inserted into the first through hole, the second through hole, and the third through hole and connected to the plate-shaped laminate by a joining material is provided.
The flat heat transfer tube has a major axis in the first direction and a minor axis in the second direction intersecting the first direction.
The flat heat transfer tube is arranged so that the second direction corresponds to the height direction.
The plate-shaped laminate is a header and
The first through hole has a first opening cross-sectional area and
The second through hole has a second opening cross-sectional area and has a second opening cross-sectional area.
The second opening cross-sectional area is larger than the first opening cross-sectional area.
In the first plate-shaped body, as the first through hole, a first through hole first portion and a first through hole second portion separated from each other in the first direction are formed.
In the second plate-shaped body, as the second through hole, a second through hole first portion and a second through hole second portion that are spaced apart from each other in the first direction are formed.
In the third plate-shaped body, a third through hole first portion is formed as the third through hole.
In the first communication passage that communicates the first part of the second through hole and the second part of the second through hole formed by the first part of the third through hole, it communicates with the first part of the second through hole. A step portion protruding toward the upper part in the second direction is formed between the portion to be formed and the portion communicating with the second through hole second portion.
The flat heat transfer tube is a heat exchanger arranged at a position lower than the top of the step portion. A refrigeration cycle apparatus comprising the heat exchanger according to any one of claims 1 to 9.

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