Outdoor unit

Abstract

This outdoor unit comprises: a housing in which a blowing outlet is formed in an upper surface; an axial flow fan that that is provided in the blowing outlet, and has a fan boss provided on a rotational axis extending in the vertical direction, and blades provided to the outer circumference of the fan boss; a bell mouth that is provided to the blowing outlet and surrounds the outer periphery of the axial flow fan; a motor that drives the axial flow fan; a motor support that supports the motor; and a heat exchanger that is provided in the housing, below the axial flow fan. The motor and the motor support are provided on the downstream side of the axial flow fan in the flow of air. The motor support has radial direction bars, and the radial direction bars have a stator blade function and extend in the radial direction, with the rotational axis serving as the center.

Description

outdoor unit

[0001] The present disclosure relates to an outdoor unit.

[0002] Patent Document 1 discloses an outdoor unit for an air conditioner. This outdoor unit for an air conditioner has a casing, a heat exchanger arranged on the side of the casing, and a blower arranged on the top of the casing. The blower has a propeller fan and a motor that drives the propeller fan. Air that flows into the casing from the side of the casing passes through the heat exchanger and is exhausted upward from the top of the casing.

[0003] JP 2015-129504 A

[0004] In the above-described outdoor unit for an air conditioner, the motor is disposed upstream of the propeller fan together with a motor support that supports the motor, which causes problems such as increased pressure loss upstream of the propeller fan and uneven flow of air flowing into the propeller fan, resulting in reduced fan efficiency.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide an outdoor unit that can improve fan efficiency.

[0006] The outdoor unit according to the present disclosure comprises a housing having an air outlet formed on its upper surface, an axial fan having a fan boss provided on a rotation axis extending in the vertical direction and blades provided on the outer periphery of the fan boss, the axial fan provided at the air outlet, a bell mouth provided at the air outlet and surrounding the outer periphery of the axial fan, a motor that drives the axial fan, a motor support that supports the motor, and a heat exchanger provided in the housing below the axial fan, the motor and the motor support being provided downstream of the axial fan in the air flow, and the motor support having radial bars that have stator blade functions and extend radially around the rotation axis.

[0007] According to the present disclosure, fan efficiency can be improved.

[0008] 11A and 11B are schematic side views showing the configuration of an outdoor unit according to Embodiment 1. FIG. 11C are top views showing the configuration of a motor support in the outdoor unit according to Embodiment 1. FIG. 11D are views showing an example where a bell mouth is made smaller in the outdoor unit according to Embodiment 1. FIG. 11E are views showing an example where blades are made larger in the outdoor unit according to Embodiment 1. FIG. 11F are views showing another example where a bell mouth is made smaller in the outdoor unit according to Embodiment 1. FIG. 11F are schematic side views showing the configuration of an outdoor unit according to Embodiment 2. FIG. 11C are schematic side views showing the configuration of an outdoor unit according to Embodiment 3. FIG. 11D are schematic cross-sectional views showing the configuration of a motor support in an outdoor unit according to Embodiment 4. FIG. 11E are schematic cross-sectional views showing the configuration of a motor support in an outdoor unit according to Embodiment 5. FIG. 11F are schematic cross-sectional views showing the configuration of a motor support in an outdoor unit according to Embodiment 6. FIG. 11F are top views showing the configuration of a motor support in an outdoor unit according to Embodiment 7. FIG. 11C are cross-sectional views showing the XII-XII cross section of FIG. 11. FIG. 11D are cross-sectional views showing the XIII-XIII cross section of FIG. 11. FIG. 11F are top views showing the configuration of a motor support in an outdoor unit according to Embodiment 8. FIG. 11F are top views showing the configuration of a motor support in an outdoor unit according to Embodiment 9.

[0009] Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to the following embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure includes all possible combinations of the configurations shown in the following embodiments. In particular, the combinations of components are not limited to the combinations in each embodiment, and components described in one embodiment can be applied to another embodiment. In the following description, directional terms (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate to facilitate understanding, but these are for explanatory purposes and do not limit the present disclosure. In each drawing, components designated with the same reference numerals are identical or equivalent, and this applies throughout the entire specification. Note that the relative dimensional relationships or shapes of each component in each drawing may differ from those in reality.

[0010] Embodiment 1. An outdoor unit according to embodiment 1 will be described. Fig. 1 is a schematic side view showing the configuration of an outdoor unit according to this embodiment. The up-down direction in Fig. 1 represents the vertical up-down direction. As shown in Fig. 1, the outdoor unit has a housing 10, an axial fan 20, a bell mouth 30, a motor 40, a motor support 50, and a heat exchanger 60. The outdoor unit is a top-flow type outdoor unit in which an air outlet 11 is formed on the top surface of the housing 10. The outdoor unit is used in a refrigeration cycle device such as an air conditioner.

[0011] The housing 10 has a rectangular parallelepiped shape. An air outlet 11 is formed on the top surface of the housing 10. The axial fan 20 is provided at the air outlet 11. The rotation axis 20a of the axial fan 20 extends vertically. The axial fan 20 has a fan boss 21 provided on the rotation axis 20a and a plurality of blades 22 provided on the outer periphery of the fan boss 21.

[0012] The bellmouth 30 is provided at the air outlet 11. The bellmouth 30 surrounds the outer periphery of the blades 22 of the axial fan 20. An upstream portion 22a of the blade 22, i.e., a portion 22a of the blade 22 on the leading edge side, protrudes upstream from the bellmouth 30. In other words, the axial fan 20 is a semi-open type.

[0013] The motor 40 is configured to drive the axial fan 20. The motor 40 is disposed above the axial fan 20, i.e., downstream of the axial fan 20 in terms of the air flow. The motor 40 is disposed coaxially with the axial fan 20.

[0014] The motor support 50 is provided at the air outlet 11. The motor support 50, together with the motor 40, is arranged above the axial fan 20, i.e., downstream of the axial fan 20 in terms of the air flow. The motor support 50 supports the motor 40 from the downstream side of the motor 40 in terms of the air flow. The motor support 50 may support the axial fan 20 via the motor 40. The motor support 50 is surrounded by the bell mouth 30. As a result, when viewed in the radial direction about the rotation axis 20a, the motor support 50 overlaps with the bell mouth 30. The configuration of the motor support 50 will be described later using FIG. 2 .

[0015] The heat exchanger 60 is disposed below the axial fan 20, i.e., upstream of the axial fan 20 in the air flow. The heat exchanger 60 is disposed on a side surface of the housing 10. For example, the heat exchangers 60 are disposed on three side surfaces of the housing 10 so as to form a U-shape when viewed from above. The heat exchangers 60 may also be disposed on two side surfaces of the housing 10 so as to form a V-shape when viewed from the side.

[0016] FIG. 2 is a top view showing the configuration of the motor support in the outdoor unit according to the present embodiment. As shown in FIG. 2, the motor support 50 has a boss portion 51, an outer edge portion 52, a plurality of radial crosspieces 53, and a plurality of circumferential crosspieces 54. The boss portion 51 is provided at the center of the motor support 50. The boss portion 51 is disposed on the rotational axis 20a of the axial flow fan 20. The boss portion 51 has a disk shape centered on the rotational axis 20a. The motor 40 is fixed to the boss portion 51. The outer edge portion 52 is formed in an annular shape centered on the rotational axis 20a. The outer edge portion 52 is attached to the inner wall surface of the bell mouth 30.

[0017] Each of the radial crosspieces 53 functions as a stator vane. That is, each of the radial crosspieces 53 has a cross-sectional shape that follows the air flow, and functions to straighten the swirling air generated by the axial flow fan 20. The radial crosspieces 53 extend in the radial direction around the rotation axis 20a. One end of each radial crosspiece 53 is connected to the boss portion 51. The other end of each radial crosspiece 53 is connected to the outer edge portion 52.

[0018] Each of the circumferential crosspieces 54 functions as a stator vane. That is, each of the circumferential crosspieces 54 has a cross-sectional shape that follows the air flow, and functions to straighten the swirling airflow generated by the axial flow fan 20. The circumferential crosspieces 54 extend in the circumferential direction about the rotation axis 20a. The circumferential crosspieces 54 intersect with a plurality of radial crosspieces 53. The circumferential crosspieces 54 are connected to the radial crosspieces 53 at each intersection.

[0019] When the axial fan 20 is driven by the motor 40, an upward airflow is generated inside the housing 10. Air that flows into the housing 10 from the side surface passes through the heat exchanger 60, the axial fan 20, the motor 40, and the motor support 50 in this order, and is exhausted upward from the air outlet 11.

[0020] In a typical top-flow outdoor unit, the motor and motor support are provided upstream of the axial fan. This tends to reduce fan efficiency due to pressure loss upstream of the axial fan and turbulence in the airflow flowing into the axial fan. In contrast, in this embodiment, the motor 40 and motor support 50 are provided downstream of the axial fan 20, which reduces pressure loss upstream of the axial fan 20 and turbulence in the airflow flowing into the axial fan 20. This improves fan efficiency.

[0021] Furthermore, in a typical top-flow outdoor unit, the leading edges of the blades are close to the motor support, which tends to increase noise. In contrast, in this embodiment, even if the trailing edges of the blades 22 are close to the motor support 50, the motor support 50 functions as a stationary blade, so an increase in noise can be suppressed. Furthermore, because the motor support 50, which is disposed downstream of the axial fan 20, also functions as a stationary blade, the dynamic pressure increased by the axial fan 20 can be efficiently converted into static pressure, thereby increasing static pressure efficiency.

[0022] Furthermore, in this embodiment, the axial fan 20 is a semi-open type, and there is no motor support upstream of the axial fan 20, so it is possible to increase the size of the blades 22 and reduce the size of the bell mouth 30. Figure 3 is a diagram showing an example of an outdoor unit according to this embodiment where the bell mouth is reduced in size. In the example shown in Figure 3, the size of the heat exchanger 60 is increased by the height dimension H1 in accordance with the reduction in size of the bell mouth 30 in the axial direction. This makes it possible to improve the unit performance of the outdoor unit.

[0023] Fig. 4 is a diagram showing an example in which the blades are enlarged in the outdoor unit according to this embodiment. In the example shown in Fig. 4, the axial size of the blade 22 is enlarged by a height dimension H2. This increases the surface area of ​​the blade 22, thereby improving fan efficiency and increasing airflow.

[0024] Fig. 5 is a diagram showing another example in which the bell mouth is made smaller in size in the outdoor unit according to the present embodiment. In the example shown in Fig. 5, the size of the housing 10 is reduced by the height dimension H3 in accordance with the reduction in size of the bell mouth 30 in the axial direction. Therefore, the reduction in size of the housing 10 can reduce the cost of the outdoor unit.

[0025] As described above, the outdoor unit according to this embodiment includes the housing 10, the axial fan 20, the bell mouth 30, the motor 40, the motor support 50, and the heat exchanger 60. The air outlet 11 is formed on the top surface of the housing 10. The axial fan 20 is provided at the air outlet 11. The axial fan 20 has a fan boss 21 provided on a rotation axis 20a extending in the vertical direction, and blades 22 provided on the outer periphery of the fan boss 21. The bell mouth 30 is provided at the air outlet 11. The bell mouth 30 surrounds the outer periphery of the axial fan 20. The motor 40 drives the axial fan 20. The motor support 50 supports the motor 40. The heat exchanger 60 is provided below the axial fan 20 in the housing 10.

[0026] The motor 40 and the motor support 50 are located downstream of the axial fan 20 in the air flow. The motor support 50 has radial crosspieces 53. The radial crosspieces 53 function as stator blades. The radial crosspieces 53 extend in the radial direction around the rotation axis 20a.

[0027] This configuration can reduce pressure loss on the upstream side of the axial flow fan 20 and turbulence of the airflow flowing into the axial flow fan 20. Therefore, fan efficiency can be improved.

[0028] In the outdoor unit according to the present embodiment, a portion 22 a of the blade 22 on the upstream side in the air flow protrudes from the bell mouth 30 .

[0029] This configuration makes it possible to reduce the size of the bell mouth 30. Furthermore, because the motor support 50 is provided downstream of the axial flow fan 20, the blades 22 can be made larger by having the portions 22 a of the blades 22 protrude upstream from the bell mouth 30.

[0030] In the outdoor unit according to the present embodiment, the motor support 50 has a plurality of circumferential crosspieces 54. Each of the plurality of circumferential crosspieces 54 functions as a stator vane. Each of the plurality of circumferential crosspieces 54 extends in the circumferential direction around the rotation axis 20a.

[0031] This configuration can reduce pressure loss on the upstream side of the axial flow fan 20 and turbulence of the airflow flowing into the axial flow fan 20. Therefore, fan efficiency can be improved.

[0032] Embodiment 2 An outdoor unit according to Embodiment 2 will now be described. Fig. 6 is a schematic side view showing the configuration of the outdoor unit according to this embodiment. As shown in Fig. 6, the diameter of the fan boss 21 increases toward the downstream side in the air flow. This allows the air to flow smoothly around the fan boss 21, as indicated by the thick arrow in Fig. 6, and prevents separation.

[0033] Since the area around the fan boss 21 is originally a low-volume area, smoothing the airflow in that area reduces pressure loss in the axial flow fan 20 and the effects of drift, thereby further improving fan efficiency. Furthermore, suppressing air separation also reduces the generation of vortices, thereby reducing noise caused by vortices.

[0034] As described above, in the outdoor unit according to this embodiment, the diameter of the fan boss 21 increases downstream in the airflow. This configuration allows for smoother airflow around the fan boss 21, thereby reducing pressure loss and the effects of drift, thereby further improving fan efficiency. Furthermore, suppressing air separation around the fan boss 21 reduces vortex-induced noise.

[0035] Third Embodiment An outdoor unit according to a third embodiment will now be described. Fig. 7 is a schematic side view showing the configuration of the outdoor unit according to this embodiment. As shown in Fig. 7, the diameter of the boss portion 51 of the motor support 50 decreases toward the downstream side in the air flow. This increases the area of ​​the housing outlet, making it possible to more efficiently convert the dynamic pressure obtained by the axial fan 20 into static pressure.

[0036] As described above, in the outdoor unit according to this embodiment, the motor support 50 has a boss portion 51 provided on the rotation axis 20a. The diameter of the boss portion 51 decreases toward the downstream side in the air flow. With this configuration, the area of ​​the housing outlet is increased, allowing for more efficient static pressure recovery.

[0037] Embodiment 4. An outdoor unit according to embodiment 4 will now be described. FIG. 8 is a schematic cross-sectional view showing the configuration of the motor support of the outdoor unit according to this embodiment. FIG. 8 shows a cross section passing through the rotation axis 20a and parallel to the rotation axis 20a. As shown in FIG. 8, the orientation of each of the circumferential crosspieces 54 is such that the more outer the circumferential crosspiece 54 is, the more outwardly the circumferential crosspiece 54 faces. In other words, taking as an example a first circumferential crosspiece 54-1 and a second circumferential crosspiece 54-2 located more outer than the first circumferential crosspiece 54-1, the second circumferential crosspiece 54-2 faces more outward than the first circumferential crosspiece 54-1.

[0038] In this embodiment, the flow of air flowing out from the axial fan 20 can be spread outward. This makes it possible to more efficiently convert the dynamic pressure obtained by the axial fan 20 into static pressure. Furthermore, since the pressure loss in the motor support 50 can be reduced, interference noise between the blades 22 and the motor support 50 can be reduced.

[0039] As described above, in the outdoor unit according to the present embodiment, the circumferential bars 54 include a first circumferential bar 54-1 and a second circumferential bar 54-2 that is provided on the outer periphery of the first circumferential bar 54-1. The second circumferential bar 54-2 faces outward relative to the first circumferential bar 54-1. With this configuration, the flow of air flowing out from the axial fan 20 can be rectified outward by the circumferential bar 54, thereby more efficiently recovering static pressure.

[0040] Embodiment 5. An outdoor unit according to embodiment 5 will now be described. FIG. 9 is a schematic cross-sectional view showing the configuration of a motor support of an outdoor unit according to this embodiment. FIG. 9 shows a cross section passing through the rotation axis 20a and parallel to the rotation axis 20a. As shown in FIG. 9, the spacing between two adjacent circumferential bars 54 increases toward the outer periphery. The outer periphery has a larger air volume and a faster air speed than the inner periphery. Therefore, by increasing the spacing between the circumferential bars 54 on the outer periphery, it is possible to reduce pressure loss in the motor support 50 and restore static pressure by expanding the flow path, thereby improving fan efficiency.

[0041] As described above, in the outdoor unit according to the present embodiment, the distance between two adjacent circumferential bars 54 among the plurality of circumferential bars 54 is wider toward the outer periphery. With this configuration, airflow resistance can be reduced on the outer periphery where the air volume and speed are relatively high, thereby improving fan efficiency.

[0042] Sixth Embodiment An outdoor unit according to a sixth embodiment will now be described. FIG. 10 is a schematic cross-sectional view showing the configuration of a motor support of an outdoor unit according to this embodiment. FIG. 10 shows a cross section passing through the rotation axis 20a and parallel to the rotation axis 20a. As shown in FIG. 10, the spacing between two adjacent circumferential bars 54 becomes narrower toward the outer periphery. The air volume on the inner periphery is smaller than that on the outer periphery. Therefore, by widening the spacing between the circumferential bars 54 on the inner periphery, the air volume on the inner periphery can be increased, thereby reducing the effects of drift.

[0043] As described above, in the outdoor unit according to the present embodiment, the spacing between two adjacent circumferential bars 54 among the plurality of circumferential bars 54 is wider toward the inner periphery. With this configuration, airflow resistance can be reduced on the inner periphery, where the air volume is relatively small, and the effects of drift can be reduced.

[0044] Seventh embodiment. An outdoor unit according to a seventh embodiment will now be described. Fig. 11 is a top view showing the configuration of the motor support of the outdoor unit according to this embodiment. Fig. 12 is a cross-sectional view showing the XII-XII cross section of Fig. 11. Fig. 13 is a cross-sectional view showing the XIII-XIII cross section of Fig. 11. Figs. 12 and 13 show cross sections perpendicular to the radial direction. The up-down direction in each of Figs. 12 and 13 represents the direction along the rotation axis 20a. The downside in each of Figs. 12 and 13 represents the upstream side in the air flow.

[0045] 11 to 13, the radial cross-section of the radial cross-section 53 is curved. As shown in FIG. 12, the inner peripheral portion of the radial cross-section 53 has a cross-section that follows the air flow. The downstream end 53b faces in the direction along the rotation axis 20a. The upstream end 53a is inclined at an angle θ1 with respect to the rotation axis 20a.

[0046] As shown in Figure 13, the outer peripheral portion of the radial crosspiece 53 has a shape that changes the direction of airflow. The downstream end 53b faces in the direction along the rotation axis 20a. The upstream end 53a is inclined at an angle θ2 with respect to the rotation axis 20a. The angle θ2 is larger than the angle θ1.

[0047] In the inner circumferential portion where the air volume is small, the resistance caused by the motor support 50 can be reduced, thereby improving fan efficiency. On the other hand, in the outer circumferential portion where the air volume is large and the air speed is high, the direction of the air flow can be changed so that it spreads out more. This makes static pressure recovery more efficient and improves performance.

[0048] As described above, in the outdoor unit according to this embodiment, the radial crosspiece 53 has a first portion and a second portion located radially outward of the first portion. The angle θ2 formed between the upstream end 53a of the second portion and the rotation axis 20a is larger than the angle θ2 formed between the upstream end 53a of the first portion and the rotation axis 20a. With this configuration, the resistance caused by the motor support 50 can be reduced in the first portion, and static pressure recovery can be made more efficient in the second portion, thereby further improving fan efficiency.

[0049] Embodiment 8 An outdoor unit according to embodiment 8 will now be described. Fig. 14 is a top view showing the configuration of the motor support of the outdoor unit according to this embodiment. Fig. 14 shows only some of the radial crosspieces 53 out of the plurality of radial crosspieces 53.

[0050] The portion 53c of the radial crosspiece 53 has a cross-sectional shape as shown in Fig. 12. Another portion 53d of the radial crosspiece 53 has a cross-sectional shape as shown in Fig. 13. In this embodiment, the portion 53c and the portion 53d are provided on each of the radial crosspieces 53 in accordance with the airflow distribution inside the housing, etc. This makes it possible to adjust the pressure loss and air volume for each region of the motor support 50.

[0051] Embodiment 9 An outdoor unit according to embodiment 9 will now be described. Fig. 15 is a top view showing the configuration of the motor support of the outdoor unit according to this embodiment. Fig. 15 shows only some of the radial crosspieces 53 out of the plurality of radial crosspieces 53.

[0052] The circumferential crosspiece 54 includes a third circumferential crosspiece 54-3, a fourth circumferential crosspiece 54-4, and a fifth circumferential crosspiece 54-5. The fourth circumferential crosspiece 54-4 is located on the outer circumferential side of the third circumferential crosspiece 54-3 and adjacent to the third circumferential crosspiece 54-3. The fifth circumferential crosspiece 54-5 is located on the outer circumferential side of the fourth circumferential crosspiece 54-4 and adjacent to the fourth circumferential crosspiece 54-4.

[0053] At least one radial crosspiece 53-1 provided between the third circumferential crosspiece 54-3 and the fourth circumferential crosspiece 54-4 is offset in the circumferential direction with respect to at least one radial crosspiece 53-2 provided between the fourth circumferential crosspiece 54-4 and the fifth circumferential crosspiece 54-5. That is, in a top view of the motor support 50, the radial crosspiece 53-2 is not provided on an extension line of the radial crosspiece 53-1, but is provided at a position offset from the extension line of the radial crosspiece 53-1. Some of the radial crosspieces 53 may extend radially between the third circumferential crosspiece 54-3 and the fifth circumferential crosspiece 54-5.

[0054] As described above, in the outdoor unit according to the present embodiment, the plurality of circumferential crosspieces 54 include the third circumferential crosspiece 54-3, the fourth circumferential crosspiece 54-4, and the fifth circumferential crosspiece 54-5. The radial crosspiece 53-1 provided between the third circumferential crosspiece 54-3 and the fourth circumferential crosspiece 54-4 is offset in the circumferential direction with respect to the radial crosspiece 53-2 provided between the fourth circumferential crosspiece 54-4 and the fifth circumferential crosspiece 54-5.

[0055] This configuration allows for a high degree of freedom in setting the distance between two adjacent radial bars 53 in accordance with the airflow distribution inside the housing, etc. Therefore, the pressure loss and air volume can be adjusted for each region of the motor support 50.

[0056] 10 Housing, 11 Air outlet, 20 Axial flow fan, 20a Rotation axis, 21 Fan boss, 22 Blade, 22a Part, 30 Bell mouth, 40 Motor, 50 Motor support, 51 Boss portion, 52 Outer edge portion, 53, 53-1, 53-2 Radial crosspiece, 53a Upstream end, 53b Downstream end, 53c, 53d Part, 54 Circumferential crosspiece, 54-1 First circumferential crosspiece, 54-2 Second circumferential crosspiece, 54-3 Third circumferential crosspiece, 54-4 Fourth circumferential crosspiece, 54-5 Fifth circumferential crosspiece, 60 Heat exchanger.

Claims

1. An outdoor unit comprising: a housing having an air outlet formed on its top surface; an axial fan provided at the air outlet, the axial fan having a fan boss provided on a rotation axis extending in the vertical direction and blades provided on the outer periphery of the fan boss; a bell mouth provided at the air outlet and surrounding the outer periphery of the axial fan; a motor that drives the axial fan; a motor support that supports the motor; and a heat exchanger provided in the housing below the axial fan, wherein the motor and the motor support are provided downstream of the axial fan in the air flow, and the motor support has radial bars that have a stator blade function and extend in a radial direction centered on the rotation axis.

2. An outdoor unit according to claim 1, wherein a portion of the vane on the upstream side in the air flow protrudes from the bell mouth.

3. An outdoor unit according to claim 1 or 2, wherein the diameter of the fan boss increases downstream in the air flow.

4. An outdoor unit as claimed in any one of claims 1 to 3, wherein the motor support has a boss portion provided on the rotation axis, and the diameter of the boss portion decreases towards the downstream side in the air flow.

5. An outdoor unit according to any one of claims 1 to 4, wherein the motor support has a plurality of circumferential bars, each of which has a stationary vane function and extends in a circumferential direction around the rotation axis.

6. An outdoor unit as described in claim 5, wherein the plurality of circumferential bars include a first circumferential bar and a second circumferential bar provided on the outer periphery side of the first circumferential bar, and the second circumferential bar faces outward more than the first circumferential bar.

7. The outdoor unit according to claim 5 or 6, wherein the interval between two adjacent circumferential bars among the plurality of circumferential bars is wider toward the outer periphery.

8. An outdoor unit according to claim 5 or 6, wherein the interval between two adjacent circumferential bars among the plurality of circumferential bars is wider toward the inner periphery.

9. An outdoor unit as described in any one of claims 5 to 8, wherein the plurality of circumferential crosspieces include a third circumferential crosspiece, a fourth circumferential crosspiece that is located more outer than the third circumferential crosspiece and adjacent to the third circumferential crosspiece, and a fifth circumferential crosspiece that is located more outer than the fourth circumferential crosspiece and adjacent to the fourth circumferential crosspiece, and the radial crosspiece located between the third circumferential crosspiece and the fourth circumferential crosspiece is offset in the circumferential direction with respect to the radial crosspiece located between the fourth circumferential crosspiece and the fifth circumferential crosspiece.

10. An outdoor unit as described in any one of claims 1 to 9, wherein the radial crosspiece has a first portion and a second portion located more radially outward than the first portion, and the angle formed between the upstream end of the second portion and the rotation axis is larger than the angle formed between the upstream end of the first portion and the rotation axis.

Images