WO2022259288A1

WO2022259288A1 - Heat exchanger and outdoor unit

Info

Publication number: WO2022259288A1
Application number: PCT/JP2021/021489
Authority: WO
Inventors: 暁八柳; 剛志前田; 伸中村
Original assignee: 三菱電機株式会社
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-12-15
Also published as: JPWO2022259288A1; EP4354069A1

Abstract

This heat exchanger comprises a first heat transfer pipe and a second heat transfer pipe inside of which are formed flow paths through which a refrigerant flows, and a header that is connected to the pipe-axis-direction end sections of the first and second heat transfer pipes. The header has a main unit that channels the refrigerant between the first and second heat transfer pipes and refrigerant piping through which the refrigerant flows, and a plate-form insertion part having a first opening. The first and second heat transfer pipes are inserted into the first opening.

Description

Heat exchanger and outdoor unit

The present disclosure relates to a heat exchanger having a header and an outdoor unit having the heat exchanger.

Conventionally, in heat exchangers, the diameter of heat transfer tubes has been reduced in order to reduce the amount of refrigerant charged. Moreover, in order to suppress deterioration in heat exchange performance due to the reduction in diameter of the heat transfer tubes, the heat transfer tubes are sometimes arranged at a narrow pitch. In Patent Document 1, as such a heat exchanger, a plurality of fins connecting a plurality of heat transfer tubes arranged in the ventilation direction are provided in a meandering manner to increase the contact ratio between the fins and the air flow. disclosed.

JP 2018-155481 A

If the heat transfer tubes are made thinner and arranged at a narrow pitch, it becomes difficult to form openings in the header into which the heat transfer tubes are inserted.

The present disclosure has been made to solve the above-described problems, and provides a heat exchanger and an outdoor unit that improve the formability of openings in headers into which heat transfer tubes are inserted.

A heat exchanger according to the present disclosure includes a first heat transfer tube and a second heat transfer tube in which a flow path through which a refrigerant flows is formed, and connected to ends of the first heat transfer tube and the second heat transfer tube in the tube axis direction. a header, the header having a body portion for circulating the refrigerant between the first heat transfer tube, the second heat transfer tube, and the refrigerant pipe through which the refrigerant flows; and a plate-like insertion portion having a first opening. , and the first heat transfer tube and the second heat transfer tube are inserted into the first opening.

In the heat exchanger and outdoor unit of the present disclosure, the first heat transfer tubes and the second heat transfer tubes are inserted into the first openings provided in the insertion portion of the header. That is, the first opening of the insertion portion is formed larger than when one heat transfer tube is inserted. Therefore, the heat exchanger and the outdoor unit can improve the moldability of the openings in the header into which the heat transfer tubes are inserted.

1 is a circuit diagram showing a refrigeration cycle apparatus according to Embodiment 1; FIG. Fig. 2 is a front view showing the outdoor heat exchanger 7 according to Embodiment 1; Fig. 3 is a side view showing the outdoor heat exchanger 7 according to Embodiment 1; 1 is a perspective view showing an outdoor heat exchanger 7 according to Embodiment 1. FIG. Fig. 2 is a front view showing the outdoor heat exchanger 7 according to Embodiment 1; 4 is a top view showing first header 21 according to Embodiment 1. FIG. Fig. 2 is a cross-sectional view showing the outdoor heat exchanger 7 according to Embodiment 1; FIG. 7 is a front view showing an outdoor heat exchanger 7A according to Modification 1 of Embodiment 1; FIG. 7 is a side view showing an outdoor heat exchanger 7A according to Modification 1 of Embodiment 1; FIG. 9 is a front view showing an outdoor heat exchanger 7B according to Modification 2 of Embodiment 1; FIG. 9 is a side view showing an outdoor heat exchanger 7B according to Modification 2 of Embodiment 1; Fig. 10 is a front view showing an outdoor heat exchanger 107 according to Embodiment 2; Fig. 10 is a side view showing an outdoor heat exchanger 107 according to Embodiment 2; Fig. 10 is a perspective view showing an outdoor heat exchanger 107 according to Embodiment 2; Fig. 10 is a front view showing an outdoor heat exchanger 107 according to Embodiment 2; FIG. 11 is a schematic diagram showing an insertion portion 41 according to Embodiment 2; 8 is a schematic diagram showing an auxiliary insertion portion 51 according to Embodiment 2; FIG. FIG. 9 is a schematic diagram showing an insertion portion 41 and an auxiliary insertion portion 51 according to Embodiment 2; FIG. 4 is a cross-sectional view showing an outdoor heat exchanger 107 according to Embodiment 2; FIG. 11 is a front view showing an outdoor heat exchanger 107A according to Modification 1 of Embodiment 2; FIG. 9 is a cross-sectional view of an outdoor heat exchanger 107A according to Modification 1 of Embodiment 2; FIG. 11 is a schematic diagram showing an insertion portion 41 according to Modification 1 of Embodiment 2; FIG. 11 is a schematic diagram showing an auxiliary insertion portion 51 according to Modification 1 of Embodiment 2; FIG. 11 is a schematic diagram showing an insertion portion 41 and an auxiliary insertion portion 51 according to Modification 1 of Embodiment 2; FIG. 9 is a cross-sectional view showing an outdoor heat exchanger 107A according to Modification 1 of Embodiment 2; FIG. 11 is a schematic diagram showing an insertion portion 41 according to Modification 2 of Embodiment 2; FIG. 11 is a schematic diagram showing an insertion portion 41 and an auxiliary insertion portion 51 according to Modification 2 of Embodiment 2; FIG. 11 is a schematic diagram showing an insertion portion 41 according to Modification 3 of Embodiment 2; FIG. 11 is a schematic diagram showing an auxiliary insertion portion 51 according to Modification 3 of Embodiment 2; FIG. 11 is a cross-sectional view showing an outdoor heat exchanger 107B according to Modification 4 of Embodiment 2; FIG. 11 is a cross-sectional view showing an outdoor heat exchanger 107C according to Modification 5 of Embodiment 2; FIG. 11 is a cross-sectional view showing an outdoor heat exchanger 107D according to Modification 6 of Embodiment 2; FIG. 11 is a front view showing an outdoor heat exchanger 207 according to Embodiment 3; FIG. 11 is a schematic diagram showing an insertion portion 41 according to Embodiment 3; FIG. 11 is a schematic diagram showing an auxiliary insertion portion 51 according to Embodiment 3; FIG. 11 is a schematic diagram showing an insertion portion 41 and an auxiliary insertion portion 51 according to Embodiment 3; FIG. 11 is a cross-sectional view showing an outdoor heat exchanger 207 according to Embodiment 3; FIG. 11 is a front view showing an outdoor heat exchanger 207A according to Modification 1 of Embodiment 3; FIG. 11 is a cross-sectional view showing an outdoor heat exchanger 207A according to Modification 1 of Embodiment 3; FIG. 11 is a cross-sectional view showing an outdoor heat exchanger 207B according to Modification 2 of Embodiment 3; FIG. 11 is a cross-sectional view showing an outdoor heat exchanger 207C according to Modification 3 of Embodiment 3;

Embodiment 1.
The outdoor heat exchanger 7 and the refrigeration cycle device 1 according to Embodiment 1 will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a refrigeration cycle apparatus 1 according to Embodiment 1. FIG. As shown in FIG. 1 , the refrigeration cycle device 1 has an outdoor unit 2 and an indoor unit 3 .

As shown in FIG. 1, the outdoor unit 2 has a compressor 5, a channel switching valve 6, an outdoor heat exchanger 7, an outdoor fan 8 and an expansion valve 9. The indoor unit 3 has an outdoor heat exchanger 7 and an outdoor fan 8 . The flow path switching valve 6, the outdoor heat exchanger 7, the expansion valve 9, and the outdoor heat exchanger 7 are connected by refrigerant pipes to form a refrigerant circuit.

The compressor 5 sucks in low-temperature and low-pressure refrigerant, compresses the sucked-in refrigerant, converts it into high-temperature and high-pressure refrigerant, and discharges it. The channel switching valve 6 switches the flow direction of the refrigerant in the refrigerant circuit, and is, for example, a four-way valve. The outdoor heat exchanger 7 exchanges heat between the refrigerant and the outdoor air. The outdoor heat exchanger 7 acts as a condenser during cooling operation, and acts as an evaporator during heating operation. The outdoor blower 8 is a device that sends outdoor air to the outdoor heat exchanger 7 . The expansion valve 9 decompresses and expands the refrigerant, and is, for example, an electronic expansion valve.

The indoor heat exchanger 10 exchanges heat between the indoor air and the refrigerant. The indoor heat exchanger 10 acts as an evaporator during cooling operation, and acts as a condenser during heating operation. The indoor fan 11 is a device that sends indoor air to the indoor heat exchanger 10, and is, for example, a cross-flow fan.

(cooling operation)
Here, the operation of the refrigeration cycle device 1 will be described. First, the cooling operation will be explained. The refrigeration cycle device 1 performs cooling operation by switching the flow path switching valve 6 so that the discharge side of the compressor 5 and the outdoor heat exchanger 7 are connected. In the cooling operation, the refrigerant sucked into the compressor 5 is compressed by the compressor 5 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the flow path switching valve 6 and flows into the outdoor heat exchanger 7 acting as a condenser. The refrigerant that has flowed into the outdoor heat exchanger 7 exchanges heat with the outdoor air sent by the outdoor fan 8, condenses, and liquefies. The liquid refrigerant flows into the expansion valve 9 and is decompressed and expanded to become a low-temperature, low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant flows into the indoor heat exchanger 10 acting as an evaporator. The refrigerant that has flowed into the indoor heat exchanger 10 exchanges heat with indoor air sent by the indoor fan 11, evaporates, and gasifies. At that time, the room air is cooled to cool the room. Thereafter, the vaporized low-temperature, low-pressure gaseous refrigerant passes through the flow path switching valve 6 and is sucked into the compressor 5 .

(heating operation)
Next, the heating operation will be explained. The refrigeration cycle device 1 performs heating operation by switching the flow path switching valve 6 so that the discharge side of the compressor 5 and the indoor heat exchanger 10 are connected. In the heating operation, the refrigerant sucked into the compressor 5 is compressed by the compressor 5 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the flow path switching valve 6 and flows into the indoor heat exchanger 10 acting as a condenser. The refrigerant that has flowed into the indoor heat exchanger 10 exchanges heat with indoor air sent by the indoor fan 11, condenses, and liquefies. At that time, the room air is warmed, and the room is heated. The liquid refrigerant flows into the expansion valve 9 and is decompressed and expanded to become a low-temperature, low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant flows into the outdoor heat exchanger 7 acting as an evaporator. The refrigerant that has flowed into the outdoor heat exchanger 7 exchanges heat with the outdoor air sent by the outdoor fan 8 to evaporate and gasify. Thereafter, the vaporized low-temperature, low-pressure gaseous refrigerant passes through the flow path switching valve 6 and is sucked into the compressor 5 .

FIG. 2 is a front view showing the outdoor heat exchanger 7 according to Embodiment 1. FIG. FIG. 3 is a side view showing the outdoor heat exchanger 7 according to Embodiment 1. FIG. FIG. 4 is a perspective view showing the outdoor heat exchanger 7 according to Embodiment 1. FIG. The white arrows in FIG. 2 indicate the flow of air. The outdoor heat exchanger 7 has a first header 21, a second header 22, and a plurality of heat transfer tubes. Hereinafter, as shown in FIGS. 2 to 4, the first heat transfer tube 23a and the second heat transfer tube 23b may be described as representatives of the plurality of heat transfer tubes. The first heat transfer tube 23 a is an arbitrary heat transfer tube among the plurality of heat transfer tubes included in the outdoor heat exchanger 7 . The second heat transfer tube 23b is a heat transfer tube adjacent to the first heat transfer tube 23a. Also, heat transfer tubes other than the first heat transfer tube 23a and the second heat transfer tube 23b have the same configuration as the first heat transfer tube 23a and the second heat transfer tube 23b.

In the following description, directions such as up and down (Y-axis direction in each figure), left and right (X-axis direction in each figure), and depth (Z-axis direction in each figure) will be used. In these directions, the first header 21 is positioned below the outdoor heat exchanger 7, the second header 22 is positioned above the outdoor heat exchanger 7, and the first header 21 and the second header 22 are elongated. It is based on the case where the outdoor heat exchanger 7 is arranged so that the direction is the horizontal direction. The orientation in which the outdoor heat exchanger 7 is arranged is not limited to the orientation described above.

The first header 21 is provided below the outdoor heat exchanger 7 . Lower ends of a plurality of heat transfer tubes are inserted into the upper surface of the first header 21, and an outflow tube 25 is connected to the side surface. The outflow pipe 25 is a part of the refrigerant pipe, through which the refrigerant flowing out from the outdoor heat exchanger 7 flows. In the first header 21 , the refrigerant that has flowed from the plurality of heat transfer tubes gathers and flows to the outflow tube 25 .

The second header 22 is provided above the outdoor heat exchanger 7 . Upper ends of a plurality of heat transfer tubes are inserted into the lower surface of the second header 22, and an inflow tube 24 is connected to the side surface. The inflow pipe 24 is a part of the refrigerant pipe, through which the refrigerant flowing into the outdoor heat exchanger 7 flows. The second header 22 distributes the refrigerant flowing from the inflow pipe 24 to a plurality of heat transfer pipes.

A plurality of heat transfer tubes are internally formed with channels through which the refrigerant flows. The plurality of heat transfer tubes are connected to headers at their ends in the tube axial direction, that is, in the vertical direction. In Embodiment 1, a flat tube is used as the heat transfer tube. One or more channels are formed inside the flattened tube.

FIG. 5 is a front view showing the outdoor heat exchanger 7 according to Embodiment 1. FIG. FIG. 5 shows the vicinity of the first header 21 of the outdoor heat exchanger 7 in an enlarged manner. The first header 21 is composed of a body portion 31 and an insertion portion 41 . The body portion 31 has a box shape with an open top. An outflow pipe 25 is connected to a side portion of the body portion 31 . The insertion portion 41 is plate-shaped, and a plurality of heat transfer tubes are inserted therein. The insertion portion 41 is provided in the main body portion 31 so as to cover the upper surface of the main body portion 31 . Note that the body portion 31 and the insertion portion 41 may be integrally formed.

A plurality of openings are formed in the insertion portion 41 . FIG. 6 is a top view showing the first header 21 according to Embodiment 1. FIG. Below, as shown in FIG. 6, the first opening 42a and the second opening 42b may be described as representatives of the plurality of openings. The first opening 42 a is an arbitrary opening among the plurality of openings formed in the insertion portion 41 . The second opening 42b is an opening adjacent to the first opening 42a. The first opening 42a and the second opening 42b are rectangular. Note that openings other than the first opening 42a and the second opening 42b have the same configuration as the first opening 42a and the second opening 42b.

The insertion portion 41 has a plurality of partitions, each of which separates two openings. Below, as shown in FIG. 6, the first partition 43a between the first opening 42a and the second opening 42b may be described as a representative of the plurality of partitions. Partitions other than the first partition 43a also have the same configuration as the first partition 43a. The locations indicated by dashed lines in FIG. 6 respectively indicate areas into which one heat transfer tube is inserted. That is, two heat transfer tubes are inserted into each opening of the insertion portion 41 .

7 is a cross-sectional view showing the outdoor heat exchanger 7 according to Embodiment 1. FIG. FIG. 7 corresponds to the AA section of FIG. As shown in FIG. 7, a first heat transfer tube 23a and a second heat transfer tube 23b are inserted into the first opening 42a of the insertion portion 41. As shown in FIG. The first heat transfer tube 23a and the second heat transfer tube 23b are provided in close contact with each other. That is, the width of the first opening 42a, that is, the dimension in the left-right direction is substantially equal to the sum of the width of the first heat transfer tube 23a and the width of the second heat transfer tube 23b. Also, the interval between the first opening 42a and the second opening 42b, that is, the width of the first partition portion 43a is wider than when one heat transfer tube is inserted into one opening.

As described above, in the outdoor heat exchanger 7 of Embodiment 1, the first heat transfer tubes 23a and the second heat transfer tubes 23b are inserted into the first openings 42a provided in the insertion portion 41 of the first header 21. . That is, the first opening 42a of the insertion portion 41 is formed larger than when one heat transfer tube is inserted. Therefore, the outdoor heat exchanger 7 can improve the formability of the openings in the first header 21 into which the heat transfer tubes are inserted.

Also, according to Embodiment 1, the distance between the plurality of openings is widened compared to the case where one heat transfer tube is inserted into one opening. Therefore, the outdoor heat exchanger 7 can further improve the moldability of the openings in the first header 21 into which the heat transfer tubes are inserted. In addition, since the formability of the openings into which the heat transfer tubes are inserted is improved, various effects can be obtained in manufacturing the outdoor heat exchanger 7, such as improved work efficiency, shortened manufacturing time, and reduced costs. .

(Modification 1 of Embodiment 1)
FIG. 8 is a front view showing an outdoor heat exchanger 7A according to Modification 1 of Embodiment 1. FIG. 9 is a side view showing an outdoor heat exchanger 7A according to Modification 1 of Embodiment 1. FIG. As shown in FIGS. 8 and 9, each of the heat transfer tubes has a bent portion 71 . The bent portion 71 is provided near the first header 21 and the second header 22 . At the bent portion 71, the first heat transfer tube 23a and the second heat transfer tube 23b are bent in opposite directions in the left-right direction. The first heat transfer tubes 23 a and the second heat transfer tubes 23 b are arranged so as to be in close contact with each other at portions of the bent portion 71 near the first header 21 and the second header 22 . Further, the first heat transfer tube 23 a and the second heat transfer tube 23 b are separated from the first header 21 and second header 22 exposed portions by bending portions 71 on the first header side and bending portions 71 on the second header 22 side. has a gap between Thereby, air flows between the first heat transfer tube 23a and the second heat transfer tube 23b.

By forming the bent portion 71 as in Modification 1 of Embodiment 1, the heat transfer tubes are arranged at a substantially narrow pitch, and the heat exchange performance can be improved.

(Modification 2 of Embodiment 1)
FIG. 10 is a front view showing an outdoor heat exchanger 7B according to Modification 2 of Embodiment 1. FIG. 11 is a side view showing an outdoor heat exchanger 7B according to Modification 2 of Embodiment 1. FIG. As shown in FIGS. 10 and 11, the bent portion 71 of the heat transfer tube is inclined with respect to the vertical direction, that is, the tube axis direction. The bent portion 71 of the heat transfer tube on the side of the first header 21 is inclined from the upstream side to the downstream side in the blowing direction of the outdoor fan 8, that is, upward from the front to the rear. The bent portion 71 of the heat transfer tube on the side of the second header 22 is inclined downward from the upstream side to the downstream side in the air blowing direction from the outdoor fan 8 .

When the refrigeration cycle apparatus 1 is operated under a low outside air temperature, frost may adhere to the contact portion between the bent portion 71 of the first heat transfer tube 23a and the bent portion 71 of the second heat transfer tube 23b. In Modification 2 of Embodiment 1, by inclining bent portion 71 with respect to the tube axis direction, retention of water generated when frost is melted is suppressed. By suppressing the retention of the melted water of frost, it is possible to suppress the refreezing of the melted water and the deterioration of the heat exchange performance caused by the refreezing.

In particular, the bent portion 71 of the heat transfer tube on the side of the second header 22 is inclined from the upstream side to the downstream side in the blowing direction of the air from the outdoor fan 8 . Therefore, at the bent portions 71 of the heat transfer tubes on the side of the second header 22, the discharge of melted frost water is facilitated, and refreezing of the melted water and deterioration of heat exchange performance due to refreezing are further suppressed. The inclination directions of the bent portion 71 on the first header 21 side and the bent portion 71 on the second header 22 side may be exchanged, or the bent portion 71 on the first header 21 side may also be the bent portion 71 on the second header 22 side. may also be formed so as to descend from the upstream side toward the downstream side in the blowing direction.

Embodiment 2.
FIG. 12 is a front view showing the outdoor heat exchanger 107 according to Embodiment 2. FIG. FIG. 13 is a side view showing the outdoor heat exchanger 107 according to Embodiment 2. FIG. FIG. 14 is a perspective view showing an outdoor heat exchanger 107 according to Embodiment 2. FIG. As shown in FIGS. 12 to 14, in the second embodiment, a plurality of heat transfer tubes are arranged with a gap therebetween. In the second embodiment, the same reference numerals are assigned to the same parts as in the first embodiment, and the description thereof is omitted.

15 is a front view showing the outdoor heat exchanger 107 according to Embodiment 2. FIG. FIG. 15 shows the vicinity of the first header 21 of the outdoor heat exchanger 107 in an enlarged manner. As shown in FIG. 15, the header of the second embodiment has an auxiliary insertion portion 51 between the insertion portion 41 and the main body portion 31. As shown in FIG. The auxiliary insertion portion 51 has a plate shape and is provided in the body portion 31 so as to cover the upper surface of the body portion 31 . The insertion portion 41 is overlapped and joined to the upper surface of the auxiliary insertion portion 51 . Note that the body portion 31 and the auxiliary insertion portion 51 may be integrally formed.

FIG. 16 is a schematic diagram showing an insertion portion 41 according to Embodiment 2. FIG. As shown in FIG. 16, the insertion portion 41 is plate-shaped with a plurality of openings. The insertion portion 41 is shorter in width than the auxiliary insertion portion 51 . Moreover, the width of the insertion portion 41 is shorter than that of the insertion portion 41 of the first embodiment.

FIG. 17 is a schematic diagram showing an auxiliary insertion portion 51 according to Embodiment 2. FIG. A plurality of auxiliary openings are formed in the auxiliary insertion portion 51 . Below, as shown in FIG. 17, the first auxiliary opening 52a and the second auxiliary opening 52b may be described as representatives of the plurality of auxiliary openings. The first auxiliary opening 52 a is an arbitrary auxiliary opening among the plurality of auxiliary openings formed in the auxiliary insertion portion 51 . The second auxiliary opening 52b is an auxiliary opening adjacent to the first auxiliary opening 52a. The first auxiliary opening 52a and the second auxiliary opening 52b are rectangular. Openings other than the first auxiliary opening 52a and the second auxiliary opening 52b have the same configuration as the first auxiliary opening 52a and the second auxiliary opening 52b.

The auxiliary insertion portion 51 has a plurality of auxiliary partitions, each partitioning two auxiliary openings. Below, the first auxiliary partition 53a between the first auxiliary opening 52a and the second auxiliary opening 52b may be described as a representative of the plurality of auxiliary partitions. Partitions other than the first auxiliary partition 53a also have the same configuration as the first auxiliary partition 53a.

FIG. 18 is a schematic diagram showing the insertion portion 41 and the auxiliary insertion portion 51 according to Embodiment 2. FIG. In FIG. 18, the insertion portion 41 and the auxiliary insertion portion 51 are hatched for convenience of explanation. As shown in FIG. 18 , the first opening 42 a of the insertion portion 41 is divided into two parts by the first auxiliary partition portion 53 a of the auxiliary insertion portion 51 when viewed from the tube axis direction. The second auxiliary opening 52b of the auxiliary insertion portion 51 is divided into two parts by the first partition portion 43a of the insertion portion 41. As shown in FIG.

The plurality of openings of the insertion portion 41 and the plurality of auxiliary openings of the auxiliary insertion portion 51 have the same shape. The width of the first opening 42a of the insertion portion 41 is substantially equal to the sum of the width of the two heat transfer tubes and the width of the first auxiliary partition portion 53a. Also, the width of the second auxiliary opening 52b is substantially equal to the sum of the width of the two heat transfer tubes and the width of the first partition portion 43a of the insertion portion 41 . The depth dimension of the first opening 42a and the first auxiliary opening 52a is substantially equal to the depth dimension of the heat transfer tube.

FIG. 19 is a cross-sectional view showing an outdoor heat exchanger 107 according to Embodiment 2. FIG. FIG. 19 shows the outdoor heat exchanger 107 cut along a cross section corresponding to the BB cross section of FIG. As shown in FIG. 19 , the first heat transfer tube 23 a is inserted into the first opening 42 a of the insertion portion 41 and the first auxiliary opening 52 a of the auxiliary insertion portion 51 . The second heat transfer tube 23 b is inserted into the first opening 42 a of the insertion portion 41 and the second opening 42 b of the auxiliary insertion portion 51 . That is, the first heat transfer tube 23a is inserted into one of the two portions partitioned by the first auxiliary partition portion 53a in the first opening 42a of the insertion portion 41 . Also, the second heat transfer tube 23b is inserted into the other of the two portions partitioned by the first auxiliary partition portion 53a in the first opening 42a of the insertion portion 41 . That is, also in Embodiment 2, the first heat transfer tubes 23a and the second heat transfer tubes 23b are inserted into the first openings 42a of the insertion portion 41 .

As described above, in the outdoor heat exchanger 107 of Embodiment 2, the first heat transfer tubes 23a and the second heat transfer tubes 23b are inserted into the first openings 42a provided in the insertion portion 41 of the first header 21. . That is, the first opening 42a of the insertion portion 41 is formed larger than when one heat transfer tube is inserted. Therefore, the outdoor heat exchanger 107 of Embodiment 2 can also improve the formability of the openings in the first header 21 into which the heat transfer tubes are inserted.

(Modification 1 of Embodiment 2)
FIG. 20 is a front view showing an outdoor heat exchanger 107A according to Modification 1 of Embodiment 2. FIG. FIG. 20 shows an enlarged view of the vicinity of the first header 21 of the outdoor heat exchanger 107A. 21 is a cross-sectional view of an outdoor heat exchanger 107A according to Modification 1 of Embodiment 2. FIG. FIG. 21 corresponds to the CC section of FIG. As shown in FIG. 21, in Modification 1 of Embodiment 2, a circular tube is used as the heat transfer tube.

FIG. 22 is a schematic diagram showing an insertion portion 41 according to Modification 1 of Embodiment 2. FIG. As shown in FIG. 22 , the plurality of openings of the insertion portion 41 are circular at both ends in the arrangement direction, and rectangular with rounded corners except for both ends in the arrangement direction.

FIG. 23 is a schematic diagram showing an auxiliary insertion portion 51 according to Modification 1 of Embodiment 2. FIG. As shown in FIG. 23, the plurality of openings are all rectangular with rounded corners.

FIG. 24 is a schematic diagram showing an insertion portion 41 and an auxiliary insertion portion 51 according to Modification 1 of Embodiment 2. FIG. As shown in FIG. 24, the first opening 42a of the insertion portion 41 is divided into two parts by the first auxiliary partition portion 53a of the auxiliary insertion portion 51 when viewed from the tube axis direction. The second auxiliary opening 52b of the auxiliary insertion portion 51 is divided into two parts by the first partition portion 43a of the insertion portion 41. As shown in FIG.

The width of the longest portion of the first opening 42a of the insertion portion 41 is substantially equal to the sum of the outer diameter of two heat transfer tubes and the width of the shortest portion of the first auxiliary partition portion 53a. Also, the width of the longest portion of the second auxiliary opening 52b is substantially equal to the sum of the outer diameters of the two heat transfer tubes and the width of the shortest portion of the first partition portion 43a of the insertion portion 41 . The depth dimension of the opening in which the shape of the insertion portion 41 is a rectangle with rounded corners is substantially the same as the depth dimension of the heat transfer tube. The diameter of the circular opening of the insertion portion 41 is substantially the same as the outer diameter of the heat transfer tube. The depth dimension of the auxiliary opening of the auxiliary insertion portion 51 is substantially the same as the depth dimension of the heat transfer tube.

25 is a cross-sectional view showing an outdoor heat exchanger 107A according to Modification 1 of Embodiment 2. FIG. As shown in FIG. 25 , the first heat transfer tube 23 a is inserted into the first opening 42 a of the insertion portion 41 and the first auxiliary opening 52 a of the auxiliary insertion portion 51 . The second heat transfer tube 23 b is inserted into the first opening 42 a of the insertion portion 41 and the second opening 42 b of the auxiliary insertion portion 51 . That is, even when circular tubes are used as the heat transfer tubes as in Modification 1 of Embodiment 2, the first heat transfer tubes 23 a and the second heat transfer tubes 23 b are inserted into the first openings 42 a of the insertion portion 41 . there is

As described above, by deforming the shapes of the opening of the insertion portion 41 and the auxiliary opening of the auxiliary insertion portion 51 to conform to circular pipes, the circular pipes of the first heat transfer pipe 23a and the second heat transfer pipe 23b are also the first heat transfer pipes. It is inserted into the first opening 42 a provided in the insertion portion 41 of the header 21 . Thereby, the moldability of the opening of the insertion portion 41 can be improved.

(Modification 2 of Embodiment 2)
FIG. 26 is a schematic diagram showing an insertion portion 41 according to Modification 2 of Embodiment 2. As shown in FIG. As shown in FIG. 26, dummy openings 44 are formed in the insertion portion 41 . The dummy opening 44 is formed side by side with the first opening 42 a of the insertion portion 41 . The width of the dummy opening 44 is shorter than that of the first opening 42a of the insertion portion 41, and substantially the same as the width of the flat tube. Since the auxiliary insertion portion 51 has the same shape as that of the second embodiment, its illustration and description are omitted.

FIG. 27 is a schematic diagram showing an insertion portion 41 and an auxiliary insertion portion 51 according to Modification 2 of Embodiment 2. FIG. As shown in FIG. 27, the dummy opening 44 and the first auxiliary opening 52a overlap. A dummy tube is inserted into the dummy opening 44 and the first auxiliary opening 52a. This makes it possible to easily align the insertion portion 41 with the auxiliary insertion portion 51 by using another member having the same shape as the heat transfer tube, for example. The dummy pipes inserted into the dummy openings 44 may have a configuration in which the coolant flow path is omitted, or may not be inserted into either the first header 21 or the second header 22. . Note that the shape of the dummy opening 44 may be appropriately changed according to the shape of the member to be inserted into the dummy opening 44 . Circular tubes may be used as the heat transfer tubes and the dummy tubes.

(Modification 3 of Embodiment 2)
28 is a schematic diagram showing an insertion portion 41 according to Modification 3 of Embodiment 2. FIG. FIG. 29 is a schematic diagram showing an auxiliary insertion portion 51 according to Modification 3 of Embodiment 2. As shown in FIG. As shown in FIG. 28, the insertion portion 41 is formed with a protrusion 72 . Further, as shown in FIG. 29, the auxiliary insertion portion 51 is provided with a concave portion 73 . The convex portion 72 of the insertion portion 41 and the concave portion 73 of the auxiliary insertion portion 51 face each other. As a result, it is possible to easily align the insertion portion 41 with the auxiliary insertion portion 51 when assembling the header. Alternatively, the recess 73 may be formed in the insertion portion 41 and the protrusion 72 may be formed in the auxiliary insertion portion 51 . A circular tube may be used as the heat transfer tube.

(Modification 4 of Embodiment 2)
30 is a cross-sectional view showing an outdoor heat exchanger 107B according to Modification 4 of Embodiment 2. FIG. FIG. 30 shows the outdoor heat exchanger 107B cut along a cross section corresponding to the BB cross section of FIG. As shown in FIG. 30, two insertion portions 41 and two auxiliary insertion portions 51 are provided. Accordingly, when forming the opening and the auxiliary opening in the insertion portion 41 and the auxiliary insertion portion 51, the plate thickness can be reduced, and molding can be easily performed. Further, when manufactured as the first header 21, the plate thickness can be increased, and the pressure resistance against the refrigerant flowing through the first header 21 is ensured. It should be noted that either the insertion portion 41 or the auxiliary insertion portion 51 may be provided two pieces. Also, three or more insertion portions 41 or auxiliary insertion portions 51 or both may be provided.

(Modification 5 of Embodiment 2)
31 is a cross-sectional view showing an outdoor heat exchanger 107C according to Modification 5 of Embodiment 2. FIG. FIG. 31 shows the outdoor heat exchanger 107C cut along the cross section corresponding to the BB cross section of FIG. As shown in FIG. 31, a contact portion 61 is provided between the auxiliary insertion portion 51 and the body portion 31 . Also, two insertion portions 41 are provided. The contact portion 61 is plate-shaped with a plurality of contact openings. The contact portion 61 is provided on the main body portion 31 so as to cover the upper surface of the main body portion 31 .

Here, as shown in FIG. 31, the first contact opening 62a and the second contact opening 62b may be described as representatives of the plurality of contact openings. The first contact opening 62 a is an arbitrary opening among the plurality of contact openings formed in the contact portion 61 . The second contact opening 62b is an opening adjacent to the first contact opening 62a. The first contact opening 62a and the second contact opening 62b are rectangular. Openings other than the first contact opening 62a and the second contact opening 62b have the same configuration as the first contact opening 62a and the second contact opening 62b. The width of the first contact opening 62a and the second contact opening 62b, that is, the dimension in the longitudinal direction, is smaller than the width of the first auxiliary opening 52a and the second auxiliary opening 52b, that is, the dimension in the longitudinal direction. The depth length of the contact opening is substantially the same as the depth length of the heat transfer tube.

The contact part 61 has a plurality of contact partition parts, each of which separates the two openings. Below, the first contact partitioning portion 63a between the first contact opening 62a and the second contact opening 62b may be described as a representative of the plurality of contact partitioning portions. Partitions other than the first contact partition 63a have the same configuration as the first contact partition 63a.

As shown in FIG. 31, the distance between the center of the first contact opening 62a and the center of the second contact opening 62b is equal to the distance between the center of the first auxiliary opening 52a and the center of the second auxiliary opening 52b. That is, the pitch of the plurality of auxiliary openings is the same as the pitch of the plurality of contact openings. Also, as described above, the width of the contact opening is smaller than the width of the auxiliary opening. Therefore, the first heat transfer tube 23a inserted into the first opening 42a of the insertion portion 41 is also inserted into the first opening 42a of the auxiliary insertion portion 51. is not inserted into the contact portion 61 and contacts the upper surface of the contact portion 61 . As a result, the lengths by which the plurality of heat transfer tubes are inserted into the first header 21 can be made uniform. Note that the body portion 31 and the contact portion 61 may be integrally formed. A circular tube may be used as the heat transfer tube.

(Modification 6 of Embodiment 2)
32 is a cross-sectional view showing an outdoor heat exchanger 107D according to Modification 6 of Embodiment 2. FIG. FIG. 32 shows the outdoor heat exchanger 107D cut along a cross section corresponding to the BB cross section of FIG. FIG. 32 shows a case where circular tubes are used as heat transfer tubes, and two insertion portions 41 and two auxiliary insertion portions 51 are provided. In other words, Modification 6 of Embodiment 2 corresponds to a configuration in which Modification 1 of Embodiment 2 and Modification 4 of Embodiment 2 are combined. As a result, even if the heat transfer tube is a circular tube, the plate thickness can be reduced when forming the opening and the auxiliary opening in the insertion portion 41 and the auxiliary insertion portion 51, and molding can be easily performed. . Further, when manufactured as the first header 21, the plate thickness can be increased, and the pressure resistance against the refrigerant flowing through the first header 21 is ensured.

Embodiment 3.
33 is a front view showing an outdoor heat exchanger 207 according to Embodiment 3. FIG. As shown in FIG. 33, the third embodiment corresponds to a combination of the first and second embodiments.

FIG. 34 is a schematic diagram showing an insertion portion 41 according to Embodiment 3. FIG. As shown in FIG. 34, the insertion portion 41 is plate-shaped with a plurality of openings.

FIG. 35 is a schematic diagram showing the auxiliary insertion portion 51 according to Embodiment 3. FIG. As shown in FIG. 35, the auxiliary insertion portion 51 is plate-shaped with a plurality of auxiliary openings.

FIG. 36 is a schematic diagram showing the insertion portion 41 and the auxiliary insertion portion 51 according to Embodiment 3. FIG. In FIG. 36, the insertion portion 41 and the auxiliary insertion portion 51 are hatched for convenience of explanation. As shown in FIG. 36, the first opening 42a of the insertion portion 41 is divided into two parts by the first auxiliary partition portion 53a of the auxiliary insertion portion 51 when viewed from the tube axis direction. The second auxiliary opening 52b of the auxiliary insertion portion 51 is divided into two parts by the first partition portion 43a of the insertion portion 41. As shown in FIG.

The plurality of openings of the insertion portion 41 and the plurality of auxiliary openings of the auxiliary insertion portion 51 have the same shape. The width of the first opening 42 a is substantially equal to the sum of the width of the four heat transfer tubes and the width of the first auxiliary partition portion 53 a of the auxiliary insertion portion 51 . The width of the second auxiliary opening 52b is approximately equal to the sum of the width of the four heat transfer tubes and the width of the first partition portion 43a of the insertion portion 41 . The depth dimension of the first opening 42a and the first auxiliary opening 52a is substantially equal to the depth dimension of the heat transfer tube.

37 is a cross-sectional view showing an outdoor heat exchanger 207 according to Embodiment 3. FIG. FIG. 37 shows the outdoor heat exchanger 207 cut along a cross section corresponding to the BB cross section of FIG. As shown in FIG. 37 , the first heat transfer tube 23 a and the second heat transfer tube 23 b are inserted into the first opening 42 a of the insertion portion 41 and the first auxiliary opening 52 a of the auxiliary insertion portion 51 . The first heat transfer tube 23a and the second heat transfer tube 23b are provided in close contact with each other. The third heat transfer tube 23 c and the fourth heat transfer tube 23 d are inserted into the first opening 42 a of the insertion portion 41 and the second auxiliary opening 52 b of the auxiliary insertion portion 51 . The third heat transfer tube 23c and the fourth heat transfer tube 23d are provided in close contact with each other. The third heat transfer tube 23c is a heat transfer tube adjacent to the second heat transfer tube 23b. The fourth heat transfer tube 23d is a heat transfer tube adjacent to the third heat transfer tube 23c.

That is, the first heat transfer tube 23a and the second heat transfer tube 23b are inserted into one of the two portions partitioned by the first auxiliary partition 53a in the first opening 42a of the insertion portion 41. Also, the third heat transfer tube 23c and the fourth heat transfer tube 23d are inserted into the other of the two portions partitioned by the first auxiliary partition 53a in the first opening 42a of the insertion portion 41 . That is, in Embodiment 3, the first heat transfer tube 23a, the second heat transfer tube 23b, the third heat transfer tube 23c, and the fourth heat transfer tube 23d are inserted into the first opening 42a of the insertion portion 41. As shown in FIG.

As described above, in the outdoor heat exchanger 207 of Embodiment 3, the first heat transfer tube 23a, the second heat transfer tube 23b, the third heat transfer tube 23c, and the fourth heat transfer tube 23d are inserted into the first header 21. 41 is inserted into a first opening 42a. That is, the first opening 42a of the insertion portion 41 is formed larger than when one heat transfer tube is inserted. Therefore, the outdoor heat exchanger 207 of Embodiment 3 can also improve the formability of the openings in the first header 21 into which the heat transfer tubes are inserted.

(Modification 1 of Embodiment 3)
FIG. 38 is a front view showing an outdoor heat exchanger 207A according to Modification 1 of Embodiment 3. FIG. 39 is a cross-sectional view showing an outdoor heat exchanger 207A according to Modification 1 of Embodiment 3. FIG. FIG. 39 shows the outdoor heat exchanger 207A cut along a cross section corresponding to the BB cross section of FIG. As shown in FIGS. 38 and 39, the multiple heat transfer tubes have bends 71 . The bent portion 71 is provided in the vicinity of the first header 21, and is a portion where the first heat transfer tube 23a and the second heat transfer tube 23b are bent in opposite directions in the left-right direction. The bent portion 71 is a portion where the third heat transfer tube 23c and the fourth heat transfer tube 23d are bent in opposite directions in the horizontal direction. The first heat transfer tube 23a and the second heat transfer tube 23b are in close contact with each other at the portion of the bent portion 71 near the first header 21 and the second header 22, and the third heat transfer tube 23c and the fourth heat transfer tube 23d are in close contact with each other. , the first header 21 and the second header 22 are arranged so as to be in close contact with each other. Further, the first heat transfer tube 23 a and the second heat transfer tube 23 b are separated from the first header 21 and second header 22 exposed portions by bending portions 71 on the first header side and bending portions 71 on the second header 22 side. has a gap between Thereby, air flows between the first heat transfer tube 23a and the second heat transfer tube 23b. Similarly, of the portions exposed from the first header 21 and the second header 22, the third heat transfer tube 23c and the fourth heat transfer tube 23d have a bent portion 71 on the first header side and a bent portion on the second header 22 side. 71 has a gap. Thereby, air flows between the third heat transfer tube 23c and the fourth heat transfer tube 23d.

By forming the bent portion 71 in this manner, the heat transfer tubes are substantially arranged at a narrow pitch, and the heat exchange performance can be improved.

(Modification 2 of Embodiment 3)
40 is a cross-sectional view showing an outdoor heat exchanger 207B according to Modification 2 of Embodiment 3. FIG. FIG. 40 shows the outdoor heat exchanger 207B cut along the cross section corresponding to the BB cross section of FIG. As shown in FIG. 40, two insertion portions 41 and two auxiliary insertion portions 51 are provided. Accordingly, when forming the opening and the auxiliary opening in the insertion portion 41 and the auxiliary insertion portion 51, the plate thickness can be reduced, and molding can be easily performed. Further, when the first header 21 is manufactured, the plate thickness can be increased, and when the widths of the first openings 42a and the second openings 42b are expanded corresponding to the insertion of four heat transfer tubes. Even so, the first header 21 ensures pressure resistance against the refrigerant flowing therein.

(Modification 3 of Embodiment 3)
41 is a cross-sectional view showing an outdoor heat exchanger 207C according to Modification 3 of Embodiment 3. FIG. FIG. 41 shows the outdoor heat exchanger 207C cut along the cross section corresponding to the BB cross section of FIG. As shown in FIG. 41, the plurality of heat transfer tubes have bent portions 71, and two insertion portions 41 and two auxiliary insertion portions 51 are provided. That is, Modification 3 of Embodiment 3 corresponds to a configuration in which Modification 1 of Embodiment 3 and Modification 2 of Embodiment 3 are combined. Accordingly, by forming the bent portion 71, the heat transfer tubes are substantially arranged at a narrow pitch, and the heat exchange performance can be improved. Further, when forming the openings and the auxiliary openings in the insertion portion 41 and the auxiliary insertion portion 51, the plate thickness can be reduced, and molding can be easily performed. Furthermore, when manufactured as the first header 21, the plate thickness can be increased, and when the widths of the first opening 42a and the second opening 42b are expanded corresponding to the insertion of four heat transfer tubes, Even so, the first header 21 ensures pressure resistance against the refrigerant flowing therein.

Although the above is the description of the embodiment and its modifications, the outdoor heat exchanger of the present disclosure can be modified in various ways other than the configuration disclosed in the first embodiment. For example, the insertion portion 41 and the auxiliary insertion portion 51 may have the same shape. The insertion portion 41 is formed into a shape that can be used as an auxiliary insertion portion 51 by reversing the front and back. In this case, the number of types of header parts can be reduced, and an improvement in yield or a reduction in management costs can be achieved.

Although the outdoor heat exchanger having only the heat transfer tubes has been described in the embodiment, the outdoor heat exchanger may have the heat transfer tubes and the fins, or the heat transfer tubes and the fins may be integrated. It may also be a formed finless heat exchanger. Further, the content of the present disclosure can be applied not only to outdoor heat exchangers but also to indoor heat exchangers. Further, the content of the present disclosure can be applied not only to the first header 21 provided at the bottom of the outdoor heat exchanger, but also to the second header 22 provided at the top of the outdoor heat exchanger. Furthermore, the contents of the present disclosure also apply to other headers, such as headers that branch the refrigerant, as long as the refrigerant flows directly or indirectly between a plurality of heat transfer tubes and refrigerant pipes in which the refrigerant flows. can be applied.

1 refrigeration cycle device, 2 outdoor unit, 3 indoor unit, 5 compressor, 6 flow path switching valve, 7 outdoor heat exchanger, 7A outdoor heat exchanger, 7B outdoor heat exchanger, 107 outdoor heat exchanger, 107A outdoor heat Exchanger, 107B Outdoor heat exchanger, 107C Outdoor heat exchanger, 107D Outdoor heat exchanger, 207 Outdoor heat exchanger, 207A Outdoor heat exchanger, 207B Outdoor heat exchanger, 207C Outdoor heat exchanger, 8 Outdoor fan, 9 Expansion valve, 10 indoor heat exchanger, 11 indoor blower, 21 first header, 22 second header, 23a first heat transfer tube, 23b second heat transfer tube, 23c third heat transfer tube, 23d fourth heat transfer tube, 24 inflow tube , 25 outflow pipe, 31 main body, 41 insertion portion, 42a first opening, 42b second opening, 43a first partition, 44 dummy opening, 51 auxiliary insertion portion, 52a first auxiliary opening, 52b second auxiliary opening, 53a first auxiliary partition, 61 abutment, 62a first abutment opening, 62b second abutment opening, 63a first abutment partition, 71 bend, 72 projection, 73 recess.

Claims

a first heat transfer tube and a second heat transfer tube, each of which has a flow path through which a refrigerant flows;
a header connected to the ends of the first heat transfer tube and the second heat transfer tube in the tube axis direction,
The header is
a main body for circulating a refrigerant between the first heat transfer tube, the second heat transfer tube, and a refrigerant pipe through which the refrigerant flows;
a plate-like insertion portion having a first opening;
The first heat transfer tube and the second heat transfer tube are inserted into the first opening of the heat exchanger.
The header is
further comprising a plate-shaped auxiliary insertion portion provided between the body portion and the insertion portion;
The insertion section is
a second opening formed in parallel with the first opening;
further comprising a first partition that partitions the first opening and the second opening;
The auxiliary insertion section is
a first auxiliary opening;
a second auxiliary opening formed in parallel with the first auxiliary opening;
a first auxiliary partition that partitions the first auxiliary opening and the second auxiliary opening;
The first opening of the insertion portion is divided into two by the first auxiliary partition portion of the auxiliary insertion portion when viewed from the tube axis direction,
The heat exchanger according to claim 1, wherein the second auxiliary opening of the auxiliary insertion portion is divided into two by the first partition portion of the insertion portion.
A concave portion or a convex portion is formed in the insertion portion,
3. The heat exchanger according to claim 2, wherein the auxiliary insertion portion is formed with a convex portion facing the concave portion of the insertion portion or a concave portion facing the convex portion of the insertion portion.
The heat exchanger according to claim 2 or 3, wherein a plurality of said insertion portions or said auxiliary insertion portions are stacked.
The header is
a plate-like contact portion provided between the main body portion and the auxiliary insertion portion and having a first contact opening and a second contact opening formed in parallel with the first contact opening; , further prepared,
The distance between the center of the first contact opening and the center of the second contact opening is equal to the distance between the center of the first auxiliary opening and the center of the second auxiliary opening,
the longitudinal dimension of the first contact opening is shorter than the longitudinal dimension of the header of the first auxiliary opening;
The heat exchanger according to any one of claims 2 to 4, wherein the longitudinal dimension of the second contact opening is shorter than the longitudinal dimension of the header of the second auxiliary opening.
The heat exchanger according to any one of claims 2 to 5, wherein the auxiliary inserting portion has the same shape as the inserting portion, and the inserting portion is turned upside down.
The first heat transfer tube is inserted into one of the portions of the first opening partitioned by the first auxiliary partition,
The heat exchanger according to any one of claims 2 to 6, wherein the second heat transfer pipe is inserted into the other part of the first opening partitioned by the first auxiliary partition.
The heat exchanger according to any one of claims 2 to 7, wherein the first heat transfer tube and the second heat transfer tube are circular tubes.
further comprising a third heat transfer tube and a fourth heat transfer tube, in which a flow path through which the refrigerant flows is formed;
The first heat transfer tube and the second heat transfer tube are inserted into one of the portions of the first opening partitioned by the first auxiliary partition,
The heat according to any one of claims 2 to 6, wherein the third heat transfer tube and the fourth heat transfer tube are inserted into the other part of the first opening partitioned by the first auxiliary partition. exchanger.
The insertion section is
The heat exchanger according to any one of claims 2 to 9, further comprising a dummy opening formed separately from the first opening and the second opening and into which a dummy pipe through which no refrigerant flows is inserted.
The heat exchanger according to any one of claims 1 to 10, wherein the first heat transfer tube and the second heat transfer tube are arranged so as to be in close contact with each other.
the first heat transfer tube and the second heat transfer tube have bending portions that bend in directions opposite to each other in the vicinity of the header;
The heat exchanger according to claim 11, wherein gaps through which air flows are formed in portions of the first heat transfer tube and the second heat transfer tube exposed from the header.
The heat exchanger according to claim 12, wherein the bent portion is inclined with respect to the tube axis direction.
A heat exchanger according to any one of claims 1 to 13;
an outdoor fan that sends air to the heat exchanger.
15. The outdoor unit according to claim 14, which is dependent on claim 11, wherein the bent portion is inclined so as to descend from the upstream side toward the downstream side in the blowing direction.