Outdoor unit and air conditioner

Abstract

An outdoor unit is provided with: a housing; the fan is contained in the shell and generates air flow penetrating through the shell; a compressor which is housed in the housing and which compresses a refrigerant; a partition plate that partitions the inside of the housing into a machine chamber in which a compressor is provided and an air supply chamber in which a fan is provided; a radiator (6) which is provided above the partition plate and which partitions the machine chamber and the air supply chamber together with the partition plate; the first control substrate (9a) and the second control substrate (9b) generate heat when at least one of the compressor and the fan is driven, the radiator (6) is provided with a plate-shaped base part (61) and a heat dissipation part (62) arranged on one surface of the base part (61), the heat dissipation part (62) comprises a first heat dissipation fin (621) and a second heat dissipation fin (622), and the first heat dissipation fin (621) and the second heat dissipation fin (622) are different in heat dissipation fin length. The first control substrate (9a) and the second control substrate (9b) are disposed such that at least a portion thereof overlaps a region of the other surface of the base section (61) in which the first heat sink (621) is provided.

Description

Technical Field

[0001] The present disclosure relates to an outdoor unit including a casing and a heat exchanger, and an air conditioner including the outdoor unit. Background Art

[0002] The air conditioner includes an indoor unit and an outdoor unit connected to each other via a refrigerant pipe. The outdoor unit includes a compressor that compresses the refrigerant, an expansion valve that decompresses the compressed refrigerant, a four-way valve that switches the flow path of the refrigerant, a heat exchanger that performs heat exchange between the refrigerant and the air, and a fan that generates airflow through the heat exchanger.

[0003] The outdoor unit of the air conditioner adopts the following structure: the interior of the housing is divided into an air supply chamber and a machine chamber by a partition, the air supply fan and the heat exchanger are arranged in the air supply chamber, and the compressor, the expansion valve and the four-way valve are arranged in the machine chamber. The first control substrate for controlling the compressor, the expansion valve and the four-way valve, and the second control substrate for controlling the fan are arranged in a radiator, which is arranged above the partition and divides the air supply chamber and the machine chamber together with the partition.

[0004] When the air conditioner is running, the first control substrate and the second control substrate generate heat. Thus, the outdoor unit of the air conditioner includes a plurality of heating elements. The radiator has fins protruding toward the air supply chamber side in order to dissipate the heat generated by these heating elements.

[0005] Patent document 1 discloses an outdoor unit in which the length of the fins gradually increases from the lower part to the upper part of the radiator in order to avoid interference with the fan. In the outdoor unit disclosed in Patent document 1, the upper part of the radiator provided with the fins having the longer fins has high heat dissipation performance, while the lower part of the radiator provided with the fins having the shorter fins has low heat dissipation performance.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-180709

[0007] However, the outdoor unit disclosed in Patent Document 1 has the following problem: when there are a plurality of heat generating elements cooled by the radiator, the heat dissipation performance of the heat generating element arranged above the radiator is reduced due to the influence of heat from the heat generating element arranged below the radiator. Summary of the invention

[0008] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide an outdoor unit that suppresses the generation of a heat generating element that is arranged at a lower portion of a radiator provided with fins having a short fin length and thus has insufficient heat dissipation.

[0009] In order to solve the above-mentioned problems and achieve the purpose, the outdoor unit disclosed in the present invention comprises: a housing; a fan, which is housed in the housing and generates an airflow passing through the housing; a compressor, which is housed in the housing and compresses the refrigerant; a heat exchanger, which is housed in the housing and performs heat exchange between the refrigerant and the airflow; a partition, which divides the interior of the housing into a machine room provided with a compressor and an air supply room provided with a fan; a radiator, which is arranged on the upper part of the partition and separates the machine room and the air supply room together with the partition; and a plurality of heat generating elements, which generate heat when at least one of the compressor and the fan is driven. The radiator comprises: a plate-shaped base portion, and a heat dissipation portion arranged on one surface of the base portion, the heat dissipation portion comprising a flat plate-shaped heat dissipation fin whose length is different in stages in at least two stages. The plurality of heat generating elements are respectively arranged so that at least a part overlaps with a region of the other surface of the base portion where a heat dissipation fin whose length is not the shortest is arranged on one surface.

[0010] Effects of the Invention

[0011] The outdoor unit of the present disclosure has an effect of being able to suppress the generation of a heat generating element that has insufficient heat dissipation due to being arranged in the lower portion of a radiator provided with fins having a short fin length. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a diagram showing the configuration of the air conditioner according to Embodiment 1.

[0013] Figure 2 This is a front view of the outdoor unit according to Embodiment 1.

[0014] Figure 3 It is a perspective view of the outdoor unit according to Embodiment 1.

[0015] Figure 4 This is a perspective view showing a part of the components of the outdoor unit according to Embodiment 1 extracted.

[0016] Figure 5 It is a side view of the radiator of the outdoor unit according to Embodiment 1.

[0017] Figure 6 It is a side view of the radiator of the outdoor unit according to Embodiment 2.

[0018] Figure 7 It is a side view of the radiator of the outdoor unit according to Embodiment 3.

[0019] Figure 8 It is a side view of a radiator of an outdoor unit according to a modified example of Embodiment 3.

[0020] Fig. 9 It is a side view of the radiator of the outdoor unit according to the fourth embodiment.

[0021] Fig.10It is a perspective view of a radiator of an outdoor unit according to Embodiment 5. DETAILED DESCRIPTION

[0022] Hereinafter, an outdoor unit and an air conditioner according to the embodiment will be described in detail based on the drawings.

[0023] Implementation method 1.

[0024] Figure 1 1 is a diagram showing the configuration of an air conditioner according to Embodiment 1. The air conditioner 100 includes an indoor unit 1 and an outdoor unit 2. The indoor unit 1 and the outdoor unit 2 are connected via a gas connection pipe 3a and a liquid connection pipe 3b. The gas connection pipe 3a and the liquid connection pipe 3b are also collectively referred to as a refrigerant pipe 3. The refrigerant is filled in the refrigerant pipe 3 and circulates between the indoor unit 1 and the outdoor unit 2 via the refrigerant pipe 3, so that the air conditioner 100 performs heat exchange between indoor and outdoor.

[0025] Figure 2 This is a front view of the outdoor unit according to Embodiment 1. Figure 3 It is a perspective view of the outdoor unit according to Embodiment 1. Figure 4 FIG. 1 is a perspective view showing a part of the components of the outdoor unit according to Embodiment 1. Figure 3 The casing 20 is omitted in the figure. The outdoor unit 2 includes: the casing 20, the compressor 4, the expansion valve 5, the heat exchanger 7, the fan 8, the control substrate 9 and the partition 11. The casing 20 accommodates the compressor 4, the expansion valve 5, the heat exchanger 7, the fan 8, the control substrate 9 and the partition 11. The refrigerant pipe 3 is connected to the casing 20.

[0026] The refrigerant circulates in the refrigerant pipe 3, the compressor 4, the expansion valve 5, the heat exchanger 7, and the heat exchanger provided in the indoor unit 1, thereby forming a refrigeration cycle. The compressor 4 compresses the refrigerant. The heat exchanger 7 performs heat exchange between the refrigerant and the air. The fan 8 rotates, thereby sucking air from the outside of the housing 20 and blowing the air to the outside of the housing 20. The air sucked from the outside of the housing 20 passes through the heat exchanger 7. When the air passes through the heat exchanger 7, heat exchange is performed between the air and the heat exchanger 7. The control substrate 9 includes a first control substrate 9a for controlling the compressor 4 and a second control substrate 9b for controlling the fan 8. The first control substrate 9a is a first heating element that generates heat when the compressor 4 is driven. The second control substrate 9b is a second heating element that generates heat when the fan 8 is driven. In this way, the control substrate 9 includes a plurality of heating elements that generate heat when at least one of the compressor 4 and the fan 8 is driven. In addition, the heat generation of the first control substrate 9a is greater than the heat generation of the second control substrate 9b. The partition plate 11 and the radiator 6 provided above the partition plate 11 partition the interior of the casing 20 into a blower chamber 50 in which the heat exchanger 7 and the fan 8 are provided and a machine chamber 51 in which the control board 9, the compressor 4 and the expansion valve 5 are provided.

[0027] Figure 5 It is a side view of the radiator of the outdoor unit of Embodiment 1. The radiator 6 includes a base portion 61 and a heat dissipation portion 62. The base portion 61 is plate-shaped and constitutes a part of the wall that separates the air supply chamber 50 and the machine chamber 51. The heat dissipation portion 62 stands up from one surface of the base portion 61 and is arranged on the air supply chamber 50 side. The heat dissipation portion 62 has a first heat dissipation fin 621 and a second heat dissipation fin 622. The first heat dissipation fin 621 and the second heat dissipation fin 622 are arranged in the up-down direction, and the first heat dissipation fin 621 is arranged above the second heat dissipation fin 622. In order to avoid interference with the fan 8, the heat dissipation fin length of the second heat dissipation fin 622 is shorter than the heat dissipation fin length of the first heat dissipation fin 621. In the following description, the portion of the radiator 6 where the first heat dissipation fin 621 is provided is referred to as the first heat dissipation area 611, and the portion where the second heat dissipation fin 622 is provided is referred to as the second heat dissipation area 612. Since the heat sink length of the second heat sink 622 is shorter than that of the first heat sink 621 , the overall heat dissipation performance of the first heat sink 621 in the first heat sink area 611 is higher than the overall heat dissipation performance of the second heat sink 622 in the second heat sink area 612 .

[0028] The first control board 9a and the second control board 9b are arranged in the horizontal direction and are provided in contact with the other surface of the base portion 61. The first control board 9a and the second control board 9b are arranged so that at least a portion overlaps with the first heat sink region 611.

[0029] Assuming that one of the first control substrate 9a and the second control substrate 9b is configured to overlap only the second heat sink area 612, the heat generated during operation cannot be dissipated from the second heat sink 622, and heat retention may cause a temperature rise. If the temperature of one of the first control substrate 9a and the second control substrate 9b rises, the heat radiated from one of the first control substrate 9a and the second control substrate 9b heats the other of the first control substrate 9a and the second control substrate 9b. Therefore, if one of the first control substrate 9a and the second control substrate 9b is only configured in the second heat sink area 612, the temperature of both the first control substrate 9a and the second control substrate 9b may rise, which may cause a malfunction.

[0030] In the outdoor unit 2 of Embodiment 1, since the first control substrate 9a and the second control substrate 9b are respectively arranged so that at least a part overlaps with the first radiator region 611, the heat generated by each of the first control substrate 9a and the second control substrate 9b is dissipated not only from the second radiator fins 622 but also from the first radiator fins 621. Therefore, the outdoor unit 2 of Embodiment 1 can prevent the heat dissipation of the portion of the first control substrate 9a and the second control substrate 9b arranged in the second radiator region 612 of the lower part of the radiator 6 provided with the second radiator fins 622 with a short radiator fin length from becoming insufficient. Therefore, the outdoor unit 2 of Embodiment 1 can prevent the heat generated from one of the first control substrate 9a and the second control substrate 9b from having a negative impact on the other of the first control substrate 9a and the second control substrate 9b. Therefore, it is not necessary to enlarge the radiator 6 to improve the heat dissipation performance, nor is it necessary to enlarge the first control substrate 9a and the second control substrate 9b to increase the heat storage amount.

[0031] In addition, the heat dissipation unit 62 is described here as including two types of heat dissipation fins having different heat dissipation fin lengths, namely, the first heat dissipation fin 621 and the second heat dissipation fin 622. However, the heat dissipation unit 62 may include three or more types of heat dissipation fins having different lengths. In this case, by providing the first control substrate 9a and the second control substrate 9b so that at least a portion overlaps with a portion other than the heat sink region where the shortest heat dissipation fin is disposed, it is possible to suppress the temperature increase of the first control substrate 9a and the second control substrate 9b.

[0032] Implementation method 2.

[0033] Figure 6 1 is a side view of a radiator of an outdoor unit according to Embodiment 2. The radiator 6 of the outdoor unit 2 according to Embodiment 2 is provided with a heat transfer sheet 63 on a base portion 61, and a first control substrate 9a and a second control substrate 9b are provided on the base portion 61 via the heat transfer sheet 63. The heat transfer sheet 63 is arranged to straddle a first radiator region 611 and a second radiator region 612.

[0034] The first control board 9a and the second control board 9b are arranged side by side in the vertical direction. The first control board 9a contacts the heat transfer sheet 63 in the first heat sink area 611 , and the second control board 9b contacts the heat transfer sheet 63 in the second heat sink area 612 .

[0035] Part of the heat generated in the second control substrate 9b is transferred to the first radiator region 611 via the heat transfer fins 63. Therefore, by transferring the heat of the second control substrate 9b arranged in the second radiator region 612 to the first radiator region 611 using the heat transfer fins 63, it is possible to suppress heat retention in the second control substrate 9b arranged in the second radiator region 612. Therefore, even if the second control substrate 9b arranged in the second radiator region 612 is not enlarged to increase the amount of heat storage, the outdoor unit 2 of Embodiment 2 can suppress insufficient heat dissipation of the second control substrate 9b arranged in the second radiator region 612 at the lower part of the radiator 6 provided with the second radiator fins 622 with a short radiator fin length. Therefore, the outdoor unit 2 of Embodiment 2 can suppress the heat generated by the second control substrate 9b from having a negative impact on the first control substrate 9a.

[0036] Implementation method 3.

[0037] Figure 7 : is a side view of the radiator of the outdoor unit of Embodiment 3. The radiator 6 of the outdoor unit 2 of Embodiment 3 has different thicknesses of the base portion 61 in the first radiator region 611 and the second radiator region 612. The thickness of the base portion 61 in the second radiator region 612 is thicker than the thickness of the base portion 61 in the first radiator region 611. Therefore, the heat storage amount per unit area of ​​the base portion 61 in the second radiator region 612 is greater than the heat storage amount per unit area of ​​the base portion 61 in the first radiator region 611. The base portion 61 varies in thickness so that the side on which the heat dissipation portion 62 is formed is convex.

[0038] In the outdoor unit 2 of Embodiment 3, the amount of heat stored per unit area of ​​the base portion 61 in the second radiator region 612 is greater than the amount of heat stored per unit area of ​​the base portion 61 in the first radiator region 611, so that the base portion 61 in the second radiator region 612 is less likely to be thermally saturated. Therefore, the heat generated by the second control substrate 9b arranged in the second radiator region 612 is less likely to be retained in the second control substrate 9b. Thus, the outdoor unit 2 of Embodiment 3 can suppress the second control substrate 9b arranged in the second radiator region 612 at the lower part of the radiator 6 provided with the second radiator fins 622 having a short fin length from being insufficiently radiated. Therefore, the outdoor unit 2 of Embodiment 3 can suppress the heat generated by the second control substrate 9b from having a negative impact on the first control substrate 9a.

[0039] Figure 81 is a side view of a radiator of an outdoor unit according to a modification of Embodiment 3. In the radiator 6 of the outdoor unit 2 according to the modification of Embodiment 3, the thickness of the base portion 61 is changed so that the surface opposite to the surface on which the heat dissipation portion 62 is formed is convex. In the radiator 6 according to the modification of Embodiment 3, since the surface on the side on which the heat dissipation portion 62 is provided in the base portion 61 is flat, the heat dissipation fin length of the second heat dissipation fin 622 can be extended compared to the radiator 6 according to Embodiment 3. Therefore, the radiator 6 according to the modification of Embodiment 3 can improve the heat dissipation performance in the second heat dissipation region 612 compared to the radiator 6 according to Embodiment 3. Therefore, the radiator 6 according to the modification of Embodiment 3 can suppress the negative impact of the heat generated by the second control substrate 9b on the first control substrate 9a.

[0040] Implementation method 4.

[0041] Fig. 9 : is a side view of the radiator of the outdoor unit of Embodiment 4. In the radiator 6 of the outdoor unit 2 of Embodiment 4, the fin pitch of the first fin 621 is different from the fin pitch of the second fin 622. The fin pitch of the first fin 621 is greater than the fin pitch of the second fin 622, and the number of the first fin 621 is less than the number of the second fin 622. Therefore, the surface area of ​​the first fin 621 as a whole in the first radiator region 611 is smaller than the surface area of ​​the second fin 622 as a whole in the second radiator region 612.

[0042] The surface area of ​​the second heat sink 622 disposed in the second heat sink region 612 of the outdoor unit 2 of the fourth embodiment is larger than the surface area of ​​the first heat sink 621 disposed in the first heat sink region 611, so that the heat generated by the second control substrate 9b can be effectively dissipated. Therefore, the heat generated by the second control substrate 9b disposed in the second heat sink region 612 is also less likely to be retained in the second control substrate 9b. Thus, the outdoor unit 2 of the fourth embodiment can suppress the second control substrate 9b disposed in the second heat sink region 612 at the lower part of the radiator 6 provided with the second heat sink 622 having a short heat sink length from being insufficiently dissipated. Therefore, the outdoor unit 2 of the fourth embodiment can suppress the heat generated by the second control substrate 9b from having a negative impact on the first control substrate 9a.

[0043] Implementation method 5.

[0044] Fig.10 1 is a perspective view of a radiator of an outdoor unit according to Embodiment 5. Fig.10In the figure, only one of the first heat sink 621 and the second heat sink 622 is shown, and the others are omitted. In the radiator 6 of the outdoor unit 2 of the fifth embodiment, the perimeter cross-sectional area ratio of the first heat sink 621 is different from the perimeter cross-sectional area ratio of the second heat sink 622. The perimeter cross-sectional area ratio is the ratio of the perimeter of the cross section of the heat sink to the cross-sectional area, and is defined as the value obtained by dividing the perimeter by the cross-sectional area. The perimeter cross-sectional area ratio of the second heat sink 622 is greater than the perimeter cross-sectional area ratio of the first heat sink 621.

[0045] If the material of the heat sink is the same, the amount of heat that can be stored in one heat sink can be determined by the volume of the heat sink. Therefore, when the length of the heat sink is the same, the amount of heat that can be stored in one heat sink can be determined based on the cross-sectional area of ​​the heat sink. On the other hand, the heat dissipation from the heat sink depends on the surface area of ​​the heat sink. The larger the surface area, the higher the heat dissipation performance. Therefore, if the length of the heat sink and the cross-sectional area of ​​the heat sink are the same, the larger the surface area of ​​the heat sink, the higher the heat sink efficiency.

[0046] The surface area of ​​the heat sink is represented by the product of the perimeter of the heat sink and the length of the heat sink. The cross-sectional area of ​​a heat sink with a rectangular cross-section of thickness d and width W is dW, and the perimeter of the heat sink is 2(d+W). Here, it is assumed that the thickness of the first heat sink 621 is d1 and the width is W1, and the thickness of the second heat sink 622 is d2 and the width is W2. The perimeter cross-sectional area ratio of the first heat sink 621 is 2(d1+W1) / (d1×W1), and the perimeter cross-sectional area ratio of the second heat sink 622 is 2(d2+W2) / (d2×W2). Therefore, the heat sink 6 of embodiment 5 satisfies the condition of {2(d2+W2) / (d2×W2)}>{2(d1+W1) / (d1×W1)}. Here, if the heat sink length of the first heat sink 621 is L1 and the heat sink length of the second heat sink 622 is L2, then if L1×2(d2+W2) / (d2×W2)>L2×2(d1+W1) / (d1×W1), the heat sink efficiency of the second heat sink 622 is higher than the heat sink efficiency of the first heat sink 621.

[0047] In the radiator 6 of the fifth embodiment, the fin efficiency of the second fin 622 is higher than the fin efficiency of the first fin 621. Therefore, the heat generated by the second control substrate 9b arranged in the second radiator region 612 is less likely to be retained in the second control substrate 9b. Thus, the outdoor unit 2 of the fifth embodiment can suppress the heat dissipation of the second control substrate 9b arranged in the second radiator region 612 at the lower part of the radiator 6 provided with the second fin 622 having a short fin length from becoming insufficient. Therefore, the outdoor unit 2 of the fifth embodiment can suppress the heat generated by the second control substrate 9b from having a negative impact on the first control substrate 9a.

[0048] In the third, fourth and fifth embodiments, the heat sink 6 is provided with the heat transfer sheet 63 . However, the heat transfer sheet 63 may be omitted and the first control board 9 a and the second control board 9 b may be in contact with the other surface of the base portion 61 .

[0049] The configuration described in the above embodiment is merely an example of the content, and can be combined with other well-known technologies. Part of the configuration can be omitted or changed without departing from the gist.

[0050] Description of Reference Numerals

[0051] 1…indoor unit; 2…outdoor unit; 3…refrigerant piping; 3a…gas connecting piping; 3b…liquid connecting piping; 4…compressor; 5…expansion valve; 6…radiator; 7…heat exchanger; 8…fan; 9…control board; 9a…first control board; 9b…second control board; 11…partition; 20…housing; 50…air supply chamber; 51…machine chamber; 61…base; 62…heat dissipation section; 63…heat transfer fin; 100…air conditioner; 611…first radiator region; 612…second radiator region; 621…first radiator fin; 622…second radiator fin.

Claims

1. An outdoor unit, characterized in that: have: case; a fan, which is received in the housing and generates an airflow passing through the housing; A compressor, which is accommodated in the shell and compresses the refrigerant; a heat exchanger, which is accommodated in the shell and performs heat exchange between the refrigerant and the airflow; a partition plate which divides the interior of the housing into a machine room in which the compressor is provided and an air supply room in which the fan is provided; a radiator, which is arranged on the upper part of the partition plate and separates the machine room and the air supply room together with the partition plate; as well as a plurality of heat generating elements that generate heat when at least one of the compressor and the fan is driven; The heat sink comprises: a plate-shaped base portion, and a heat dissipation portion provided on one surface of the base portion, wherein the heat dissipation portion comprises a flat plate-shaped heat dissipation fin having a heat dissipation fin length that is different in stages in at least two stages. Each of the plurality of heat generating elements is arranged so that at least a portion overlaps with a region of the other surface of the base portion where a heat dissipation fin having a length that is not the shortest is provided on the one surface.

2. The outdoor unit according to claim 1, characterized in that: The heat dissipation unit includes: a first heat dissipation fin and a second heat dissipation fin having a shorter heat dissipation fin length than the first heat dissipation fin and disposed below the first heat dissipation fin. The plurality of heat generating elements include a first control substrate for driving a compressor and a second control substrate for driving a fan.

3. An outdoor unit, characterized in that: have: case; a fan, which is received in the housing and generates an airflow passing through the housing; A compressor, which is accommodated in the shell and compresses the refrigerant; a heat exchanger, which is accommodated in the shell and performs heat exchange between the refrigerant and the airflow; a partition plate which divides the interior of the housing into a machine room in which the compressor is provided and an air supply room in which the fan is provided; a radiator, which is arranged on the upper part of the partition plate and separates the machine room and the air supply room together with the partition plate; a first heat generating body which generates heat when the compressor is driven; as well as a second heat generating body which generates heat when the fan is driven; The heat sink includes a plate-shaped base portion, a heat dissipation portion provided on one surface of the base portion, and a heat transfer sheet provided on a surface of the base portion opposite to the surface on which the heat dissipation portion is provided. The heat dissipation unit includes: a first heat dissipation fin and a second heat dissipation fin having a shorter heat dissipation fin length than the first heat dissipation fin and disposed below the first heat dissipation fin. The heat transfer fin is arranged to span: a portion where the first heat sink is arranged, namely, a first heat sink region, and a portion where the second heat sink is arranged, namely, a second heat sink region. The first heating element abuts against the heat transfer sheet in the first heat sink region. The second heating element is in contact with the heat transfer sheet in the second heat sink region.

4. An outdoor unit, characterized in that: have: case; a fan, which is received in the housing and generates an airflow passing through the housing; A compressor, which is accommodated in the shell and compresses the refrigerant; a heat exchanger, which is accommodated in the shell and performs heat exchange between the refrigerant and the airflow; a partition plate which divides the interior of the housing into a machine room in which the compressor is provided and an air supply room in which the fan is provided; a radiator, which is arranged on the upper part of the partition plate and separates the machine room from the air supply room together with the partition plate; a first heat generating body which generates heat when the compressor is driven; as well as a second heat generating body which generates heat when the fan is driven, The heat sink includes a plate-shaped base portion and a heat dissipation portion provided on one surface of the base portion. The heat dissipation unit includes: a first heat dissipation fin and a second heat dissipation fin having a shorter heat dissipation fin length than the first heat dissipation fin and disposed below the first heat dissipation fin. The first heating element is in contact with the other surface of the base portion in a first heat sink region where the first heat sink is provided. The second heating element is in contact with the other surface of the base portion in a second heat sink region where the second heat sink is provided. The heat dissipation performance of the second heat sink in the second heat sink region is higher than the heat dissipation performance of the first heat sink in the first heat sink region.

5. The outdoor unit according to claim 4, characterized in that: The base portion has a thicker thickness in a portion where fins having shorter fin lengths are provided.

6. The outdoor unit according to claim 4, characterized in that: In the heat dissipation portion, the shorter the heat dissipation fin length is, the larger the surface area of ​​the entire heat dissipation fin is.

7. The outdoor unit according to claim 4, characterized in that: In the heat dissipation unit, the shorter the heat dissipation fin length is, the higher the heat dissipation fin efficiency is.

8. The outdoor unit according to any one of claims 4 to 7, characterized in that: The heat sink includes a heat transfer fin, the heat transfer fin being provided to span: a first heat sink region provided with the first heat sink fin and a second heat sink region provided with the second heat sink fin on the other surface of the base portion; The first heating element is disposed in a portion of the heat transfer sheet that overlaps with the first heat sink area. The second heating element is disposed at a portion of the heat transfer sheet that overlaps with the second heat sink region.

9. An air conditioner, characterized in that: have: The outdoor unit according to any one of claims 1 to 8; and Indoor unit.

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