Cross-flow fan

Abstract

Provided is a cross-flow fan with which stall at the end of an impeller is minimized and stall resistance can be improved. To achieve this purpose, a cross-flow fan (100) comprises an impeller (110) comprising a plurality of support members and a plurality of blades provided between adjacent support members, a motor (150) provided at one end of a rotating shaft of the impeller, a stabilizer (220) disposed along the rotation axis direction with a gap from the outer periphery of the impeller, and a protrusion (221) provided protruding toward the impeller side on an impeller-facing surface of the stabilizer and disposed along the rotation axis direction. The motor-side end of the protrusion in the rotation axis direction is disposed farther along the downstream side in the direction of impeller rotation than the center of the protrusion in the rotation axis direction.

Description

Technical Field

[0001] The present disclosure relates to a cross-flow fan.

Background Art

[0002] In a cross-flow fan, there is known one including a fan, a stabilizer arranged along the axial direction of the fan, and a rectifying portion provided on the side opposite to the side of the stabilizer facing the fan to adjust the air flow rate in a direction perpendicular to the axial direction of the fan (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the cross-flow fan as shown in Patent Document 1, by shortening the length of the rectifying portion on the motor side in the direction in which the rectifying portion and the fan are arranged, the inflow air volume to the end portion on the motor side where the flow inside the fan tends to be turbulent is increased. However, in such a cross-flow fan, in order to increase the inflow air volume at the end portion in the rotational axis direction of the fan by providing a rectifying portion on the stabilizer, the inflow air volume mainly increases on the side close to the stabilizer. As a result of increasing the inflow air volume on the side close to the stabilizer, the inflow air volume on the stabilizer side becomes excessive with respect to the inflow air volume on the rear guide side far from the stabilizer, the outflow from the upstream side of the fan casing increases, and there is a possibility that the stall margin decreases.

[0005] The present disclosure has been made to solve such problems. An object thereof is to provide a cross-flow fan capable of suppressing stall at the end portion on the motor side of the impeller and improving the stall margin.

Means for Solving the Problem

[0006] The cross-flow fan according to the present disclosure includes a plurality of support members arranged at a preset interval in the rotation axis direction and having a circular or annular flat plate shape, and a plurality of blades provided between adjacent support members, disposed near the outer periphery of the support members and spaced apart in the circumferential direction. The cross-flow fan further includes an impeller, a motor provided at one end of the rotation axis of the impeller, a stabilizer disposed at a distance from the outer periphery of the impeller in the rotation axis direction, and a convex portion provided to protrude toward the impeller side on the surface of the stabilizer facing the impeller and arranged in the rotation axis direction. The end portion of the convex portion on the motor side in the rotation axis direction is arranged on the downstream side in the rotation direction of the impeller rather than at the central portion of the convex portion in the rotation axis direction. The area of the surface of the end portion on the motor side in the rotational axis direction of the convex portion facing the impeller is larger than the area of the surface of the central portion in the rotational axis direction of the convex portion facing the impeller. 。 Alternatively, the cross-flow fan according to the present disclosure includes a plurality of support members arranged at preset intervals in the rotational axis direction and having a circular or annular flat plate shape, and a plurality of blades provided between adjacent support members, arranged near the outer periphery of the support members and spaced apart in the circumferential direction. The cross-flow fan also includes a motor provided at one end of the rotational axis of the impeller, a stabilizer arranged at a distance from the outer periphery of the impeller over the rotational axis direction, and a convex portion provided to protrude toward the impeller side on the surface of the stabilizer facing the impeller and arranged over the rotational axis direction. The end portion on the motor side in the rotational axis direction of the convex portion is arranged on the downstream side in the rotational direction of the impeller than the central portion in the rotational axis direction of the convex portion, and the surface of the convex portion facing the impeller is formed such that the distance from the impeller gradually decreases from the upstream side to the downstream side in the rotational direction of the impeller.

Advantages of the Invention

[0007] According to the cross-flow fan of the present disclosure, it is possible to suppress stall at the end portion on the motor side of the impeller and improve stall tolerance.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0009] A mode for carrying out the cross-flow fan according to the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions will be simplified or omitted as appropriate. In the following description, for convenience, the positional relationship of each structure may be expressed based on the illustrated state. Note that the present disclosure is not limited to the following embodiments, and within the scope not departing from the gist of the present disclosure, any combination of the embodiments, deformation of any component of each embodiment, or omission of any component of each embodiment is possible.

[0010] Embodiment 1. Embodiment 1 of the present disclosure will be described with reference to FIGS. 1 to 7. FIG. 1 is a cross-sectional view of an air conditioner equipped with a cross-flow fan. FIG. 2 is a view showing the configuration excluding the casing of the cross-flow fan. FIG. 3 is a view of the stabilizer of the cross-flow fan as seen from the impeller side. FIGS. 4 and 5 are cross-sectional views of an air conditioner equipped with a cross-flow fan. FIG. 6 is a view of the stabilizer of a modification of the cross-flow fan as seen from the impeller side. FIG. 7 is a cross-sectional view showing an enlarged main part of a modification of the cross-flow fan.

[0011] As an example of a refrigeration cycle apparatus including a cross-flow fan according to the present disclosure, a configuration example of an air conditioner will be described. Note that examples of the refrigeration cycle apparatus including a cross-flow fan according to the present disclosure include, in addition to an air conditioner, for example, a showcase or the like. Further, as will be described later, the air conditioner has a function of blowing air. Therefore, the air conditioner described herein is also an example of a blowing device including a cross-flow fan according to the present disclosure. Note that examples of the blowing device including a cross-flow fan according to the present disclosure include, in addition to an air conditioner, for example, a circulator, a tower-type fan, or the like.

[0012] The air conditioner, which is a refrigeration cycle apparatus according to this embodiment, includes an indoor unit 1 shown in FIG. 1 and an outdoor unit (not shown). The indoor unit 1 is installed inside a room, that is, indoors, which is the object of air conditioning. The outdoor unit is installed outside the room, that is, outdoors.

[0013] The indoor unit 1 and the outdoor unit are connected by a refrigerant pipe (not shown). The indoor unit 1 includes a cross-flow fan 100 and a heat exchanger 14. The outdoor unit includes an outdoor unit fan, a heat exchanger, a compressor, an expansion valve, a four-way valve, and the like, none of which are shown. The refrigerant pipe is provided circularly between the heat exchanger 14 of the indoor unit 1 and the heat exchanger (not shown) of the outdoor unit. A refrigerant is enclosed in the refrigerant pipe. The refrigerant enclosed in the refrigerant pipe is, for example, difluoromethane (CH2F2: R32) or the like. The refrigerant pipe annularly connects the heat exchanger 14 of the indoor unit 1, the four-way valve, the compressor, the heat exchanger, and the expansion valve of the outdoor unit. Therefore, a refrigerant circuit is formed in which the refrigerant circulates between the heat exchanger of the indoor unit 1 and the heat exchanger of the outdoor unit.

[0014] The compressor of the outdoor unit is a device that compresses the supplied refrigerant to increase the pressure and temperature of the refrigerant. As the compressor, for example, a rotary compressor, a scroll compressor, a reciprocating compressor, or the like can be used. The expansion valve expands the refrigerant condensed in the heat exchanger of the outdoor unit and reduces the pressure of the refrigerant.

[0015] The heat exchanger 14 of the indoor unit 1 exchanges heat between the refrigerant flowing into the heat exchanger 14 and the air around the heat exchanger 14. The cross-flow fan 100 blows air so that the indoor air passes around the heat exchanger 14, promotes the heat exchange between the refrigerant and the air in the heat exchanger 14, and sends out the air heated or cooled by the heat exchange back into the room. The heat exchanger of the outdoor unit exchanges heat between the refrigerant flowing into the heat exchanger and the air around the heat exchanger. The outdoor unit fan blows air so that the outdoor air passes around the heat exchanger of the outdoor unit, and promotes the heat exchange between the refrigerant and the air in the heat exchanger.

[0016] The refrigerant circuit configured in this way acts as a heat pump that transfers heat between the indoor unit 1 and the outdoor unit by exchanging heat between the refrigerant and the air in each of the heat exchanger 14 of the indoor unit 1 and the heat exchanger of the outdoor unit. At this time, by switching the four-way valve, the circulation direction of the refrigerant in the refrigerant circuit can be reversed to switch between the cooling operation and the heating operation of the air conditioner.

[0017] As shown in FIG. 1, the indoor unit 1 includes a housing 10. The housing 10 is installed indoors. Inside the housing 10, a heat exchanger 14 and a cross-flow fan 100 are accommodated. An air inlet 11 is formed in the upper surface portion of the housing 10. The air inlet 11 is an opening for taking air from the outside into the inside of the housing 10. An air outlet 12 is formed in the lower surface of the housing 10. The air outlet 12 is an opening for discharging air from the inside of the housing 10 to the outside.

[0018] An air passage leading from the air inlet 11 to the air outlet 12 is formed inside the housing 10. A filter 13 is installed at the air inlet 11. The filter 13 is for removing relatively large dust, dirt, dust, etc. from the air entering the inside of the housing 10 from the air inlet 11.

[0019] A heat exchanger 14 is installed on the downstream side of the filter 13 in the air passage within the housing 10. The heat exchanger 14 exchanges heat with the air flowing through the air passage in the housing 10 to heat or cool the air flowing through the air passage. Whether to heat or cool the air depends on whether the air conditioner is in heating operation or cooling operation.

[0020] A cross-flow fan 100 is installed on the downstream side of the heat exchanger 14 in the aforementioned air passage. The cross-flow fan 100 is for generating an air flow from the suction port 11 toward the blowout port 12 in the air passage within the housing 10. A rear guide 210 is provided on the rear side of the impeller of the cross-flow fan 100 within the housing 10. Also, a stabilizer 220 is provided on the front side of the impeller of the cross-flow fan 100 within the housing 10.

[0021] The rear guide 210 is arranged in a spiral shape such that the distance from the impeller of the cross-flow fan 100 increases as it goes from the heat exchanger 14 side toward the blowout port 12 side. The stabilizer 220 on the front side of the impeller of the cross-flow fan 100 protrudes tongue-shaped toward the rear side on the blowout port 12 side of the impeller. These rear guide 210 and stabilizer 220 constitute the casing 200 of the cross-flow fan 100. The impeller of the cross-flow fan 100 is accommodated inside the casing 200 of the cross-flow fan 100. And by providing such a casing 200, when the impeller of the cross-flow fan 100 rotates in the rotation direction R indicated by the arrow in the figure, the following air flow is generated. That is, air is sucked into the space between the blades of the impeller from the heat exchanger 14 side where the flow path resistance is the smallest. Then, the sucked air flows through the impeller and blows out to the blowout port 12 side where the flow path resistance is the next smallest.

[0022] An air deflector 15 is provided at the air outlet 12. The air deflector 15 is for adjusting the blowing angle of the air blown out from the air outlet 12. In FIG. 1, the upper and lower air deflectors of the air deflector 15 are shown. By changing the direction of the upper and lower air deflectors, the indoor unit 1 can change the blowing direction up and down. Also, although not shown here, the air outlet 12 is also provided with left and right air deflectors as the air deflector 15. The left and right air deflectors are for adjusting the blowing angle in the left and right directions of the air blown out from the air outlet 12.

[0023] When the cross-flow fan 100 operates, an air flow from the suction port 11 toward the air outlet 12 is generated in the air passage, air is sucked in from the suction port 11, and air is blown out from the air outlet 12. The air sucked in from the suction port 11 becomes an air flow that passes through the air passage inside the housing 10 in the order of the filter 13, the heat exchanger 14, and the cross-flow fan 100, and is blown out from the air outlet 12. At this time, the air deflector 15 disposed on the downstream side of the cross-flow fan 100 adjusts the direction of the air blown out from the air outlet 12, that is, the blowing direction. The indoor unit 1 of the air conditioner configured as described above blows air into the room. And the indoor unit 1 can change the temperature and the blowing direction of the blowing air flow.

[0024] As shown in FIG. 2, the cross-flow fan 100 includes an impeller 110 and a motor 150. The impeller 110 includes a support member 120, blades 130, and a rotating shaft 140. The motor 150 rotates the impeller 110 around the rotating shaft 140. The motor 150 is provided at one end of the rotating shaft 140 of the impeller 110.

[0025] The impeller 110 includes a plurality of support members 120. The support members 120 are flat members having a circular or annular shape. The plurality of support members 120 are arranged at preset intervals in a direction parallel to the rotation axis 140 (hereinafter also referred to as the rotation axis 140 direction). The rotation axis 140 of the impeller 110 is provided so as to penetrate the center of the circular or annular shape of the plurality of support members 120. A plurality of blades 130 are provided between adjacent support members 120. The plurality of blades 130 are provided near the outer periphery of the support members 120. The plurality of blades 130 are aligned at intervals along the circumferential direction of the support members 120. A plurality of blades 130 supported between a pair of support members 120 form a set. The impeller 110 of the cross-flow fan 100 is configured by connecting about 7 to 14 sets in the rotation axis 140 direction.

[0026] As described above, the casing 200 of the cross-flow fan 100 is composed of a rear guide 210 and a stabilizer 220. The impeller 110 is housed inside the casing 200 of the cross-flow fan 100. The stabilizer 220, which is a part of the casing 200, is arranged at a distance from the outer periphery of the impeller 110. Further, the stabilizer 220 is arranged in the rotation axis 140 direction.

[0027] As shown in FIG. 1, the cross-flow fan 100 according to this embodiment includes a convex portion 221. The convex portion 221 is provided on the surface of the stabilizer 220 facing the impeller 110. The convex portion 221 protrudes toward the impeller 110 from the surface of the stabilizer 220 facing the impeller 110.

[0028] FIG. 3 is a view of the surface of the stabilizer 220 facing the impeller 110 as viewed from the impeller 110 side. As shown in the figure, the convex portion 221 is arranged in the rotation axis 140 direction. In the illustrated example, the convex portion 221 is smoothly continuous in the rotation axis 140 direction.

[0029] Both ends of the convex portion 221 in the direction of the rotation axis 140 are arranged on the downstream side in the rotation direction R of the impeller 110 rather than the central portion of the convex portion 221 in the direction of the rotation axis 140. That is, the end on the motor 150 side in the direction of the rotation axis 140 of the convex portion 221 is arranged on the downstream side in the rotation direction R of the impeller 110 rather than the central portion of the convex portion 221 in the direction of the rotation axis 140. And the end on the side opposite to the motor 150 in the direction of the rotation axis 140 of the convex portion 221 is also arranged on the downstream side in the rotation direction R of the impeller 110 rather than the central portion of the convex portion 221 in the direction of the rotation axis 140. Note that the arrow of the rotation direction R points from the downstream side to the upstream side of the rotation direction R.

[0030] FIG. 4 shows a cross-sectional view of the central portion in the direction of the rotation axis 140. FIG. 5 shows a cross-sectional view of the end portion in the direction of the rotation axis 140. In these figures, the airflow generated when the impeller 110 rotates in the rotation direction R is indicated by arrows. As shown in these figures, when the impeller 110 rotates in the rotation direction R, an airflow is generated that flows through the impeller 110 from the heat exchanger 14 side and blows out toward the air outlet 12 side. Also, a part of the airflow blown out from the impeller 110 toward the air outlet 12 side reflows so as to be drawn into the stabilizer 220 side of the casing 200.

[0031] The airflow that reflows to the stabilizer 220 side returns to the center of the impeller 110, that is, the rotation axis 140 side, and blows out from the casing 200 again toward the air outlet 12 side. In this way, a stationary circulation flow is generated on the stabilizer 220 side. This circulation flow mainly flows along the surface of the stabilizer 220 facing the impeller 110 after reflowing.

[0032] As described above, in the cross-flow fan 100 according to this embodiment, a convex portion 221 is provided on the surface of the stabilizer 220 facing the impeller 110. The air flow that re-enters the stabilizer 220 side hits this convex portion 221 and is returned to the impeller 110 side. Therefore, the position and magnitude of the standing circulation flow are determined by the position of the convex portion 221. A part of the circulation flow exists within the region where the air flow blows out from the casing 200 (hereinafter also referred to as the fan blowing-out region).

[0033] At the central portion in the direction of the rotation axis 140 of the stabilizer 220, as shown in FIG. 4, the convex portion 221 is arranged on the upstream side in the rotation direction R, that is, closer to the air outlet 12 side in the stabilizer 220. For this reason, the position where the circulation flow stabilizes is closer to the air outlet 12 side of the stabilizer 220. As a result, the magnitude of the circulation flow is reduced, and the shaft output of the motor 150 of the cross-flow fan 100 required to obtain the same air volume, that is, the shaft input of the impeller 110, can be reduced.

[0034] On the other hand, at both ends in the direction of the rotation axis 140 of the stabilizer 220, as shown in FIG. 5, the convex portion 221 is arranged on the downstream side in the rotation direction R, that is, closer to the heat exchanger 14 side in the stabilizer 220. For this reason, the position where the circulation flow stabilizes is closer to the heat exchanger 14 side of the stabilizer 220. As a result, the portion of the circulation flow that reaches the fan blowing-out region is reduced, and the ventilation resistance can be reduced.

[0035] In particular, at the end of the impeller 110 on the motor 150 side, a space occupied by screws or the like for connecting the rotation axis 140 of the impeller 110 and the motor 150 is required, and the number of blades 130 is smaller compared to the central portion in the direction of the rotation axis 140. For this reason, at the end of the impeller 110 on the motor 150 side, the flow becomes unstable and is likely to stall.

[0036] In the cross-flow fan 100 according to this embodiment, a convex portion 221 is provided on the surface of the stabilizer 220 facing the impeller 110, and the end on the motor 150 side in the direction of the rotation axis 140 of the convex portion 221 is located on the downstream side in the rotation direction R of the impeller 110 rather than the central portion in the direction of the rotation axis 140 of the convex portion 221. For this reason, at the end of the impeller 110 on the motor 150 side, the position where the circulation flow stabilizes moves to the inner side in the casing 200, and the portion where the circulation flow reaches the fan blowing region is reduced, so that the ventilation resistance can be reduced. Also, at the central portion of the impeller 110, the magnitude of the circulation flow can be reduced, and the shaft input required to obtain the same air volume can be reduced. Therefore, it is possible to suppress the increase in the shaft input and suppress stall such as reverse flow toward the rear guide 210 at the end of the impeller 110 on the motor 150 side.

[0037] Also, at the end of the impeller 110 on the side opposite to the motor 150, it is vulnerable to the surrounding conditions of the installation location of the cross-flow fan 100, and the flow becomes unstable and is prone to stall. For example, in the cross-flow fan 100 provided in the indoor unit 1 of the air conditioner described here, at the end on the side opposite to the motor 150, it is affected by the installation space of piping or the like on the back side in the housing 10, and the inflowing air volume may be low. In such a case, at the end of the impeller 110 on the side opposite to the motor 150, since the inflowing air volume is low, it is more prone to stall than the intermediate portion in the direction of the rotation axis 140.

[0038] Therefore, the end on the side opposite to the motor 150 in the direction of the rotation axis 140 of the convex portion 221 is arranged on the downstream side in the rotation direction R of the impeller 110 rather than the central portion in the direction of the rotation axis 140 of the convex portion 221. By doing so, at the end of the impeller 110 on the side opposite to the motor 150, the position where the circulation flow stabilizes moves to the inner side in the casing 200, and the portion where the circulation flow reaches the fan blowing region is reduced, so that the ventilation resistance can be reduced. Also, at the central portion of the impeller 110, the magnitude of the circulation flow can be reduced, and the shaft input required to obtain the same air volume can be reduced. Therefore, it is possible to suppress the increase in the shaft input of the cross-flow fan 100 and suppress stall at the end of the impeller 110 on the side opposite to the motor 150.

[0039] Further, the convex portion 221 is smoothly continuous in the direction of the rotation axis 140. Therefore, it is possible to suppress the disturbance generated when the circulating flow collides with the convex portion 221, and it is possible to improve the stall margin while suppressing an increase in the shaft input of the cross-flow fan 100.

[0040] Next, a modified example of the cross-flow fan 100 according to this embodiment will be described. FIG. 6 shows a first modified example of the cross-flow fan 100 according to this embodiment. In this first modified example, the area of the surface of the convex portion 221 facing the impeller 110 is changed in the direction of the rotation axis 140. The convex portion 221 has a fan-facing surface 222. The fan-facing surface 222 is the surface of the convex portion 221 facing the impeller 110. In the configuration example shown in FIG. 6, the areas of the fan-facing surfaces 222 at both ends in the direction of the rotation axis 140 are larger than the area of the fan-facing surface 222 at the central portion in the direction of the rotation axis 140. That is, the area of the surface of the convex portion 221 facing the impeller 110 at the end on the motor 150 side in the direction of the rotation axis 140 is larger than the area of the surface of the convex portion 221 facing the impeller 110 at the central portion in the direction of the rotation axis 140. Also, in the illustrated example, the area of the surface of the convex portion 221 facing the impeller 110 at the end on the side opposite to the motor 150 in the direction of the rotation axis 140 is also larger than the area of the surface of the convex portion 221 facing the impeller 110 at the central portion in the direction of the rotation axis 140.

[0041] According to the cross-flow fan 100 according to such a first modification, at the end of the impeller 110 on the motor 150 side, since the area of the fan-facing surface 222 of the convex portion 221 is large, the ventilation resistance can be increased and the air volume of the circulating flow can be reduced. As described above, in the cross-flow fan 100 according to this embodiment, at the end of the impeller 110 on the motor 150 side, since the position where the circulating flow stays moves to the back side in the casing 200, the circulating flow tends to become large. By increasing the area of the fan-facing surface 222 of the convex portion 221 at the end of the impeller 110 on the motor 150 side, the air volume of the circulating flow can be reduced and the circulating flow can be made small. Therefore, it is possible to further improve the stall tolerance while further suppressing an increase in the shaft input of the cross-flow fan 100.

[0042] FIG. 7 shows a second modification of the cross-flow fan 100 according to this embodiment. In this second modification, as shown in the figure, the fan-facing surface 222 of the convex portion 221 is formed such that the distance from the impeller 110 gradually decreases from the upstream side to the downstream side in the rotation direction R of the impeller 110. For this reason, the circulating flow can be smoothly guided to the impeller 110 side by the fan-facing surface 222 of the convex portion 221. Therefore, it is possible to suppress the turbulence of the air flow generated when the circulating flow collides with the main flow that passes through the heat exchanger 14 on the front side of the housing 10 and enters the casing 200, and to further improve the stall tolerance while further suppressing an increase in the shaft input of the cross-flow fan 100.

Industrial Applicability

[0043] The present disclosure can be used for a cross-flow fan including an impeller, a motor provided at one end of the rotation shaft of the impeller, and a stabilizer arranged at an interval from the outer periphery of the impeller in the rotation shaft direction. Further, the present disclosure can also be used for a blower device and a refrigeration cycle device including a cross-flow fan.

Explanation of Signs

[0044] 1 Indoor unit 10 Housing 11 Suction port 12 Air outlet 13 Filter 14 Heat exchanger 15 Wind direction plate 100 Cross-flow fan 110 Impeller 120 Support member 130 Blade 140 Rotation shaft 150 Motor 200 Casing 210 Rear guide 220 Stabilizer 221 Protrusion 222 Fan-facing surface

Claims

1. A plurality of support members arranged at a preset interval in the direction of the rotation axis, presenting a circular or annular flat plate shape, and a plurality of blades provided between adjacent said support members, near the outer periphery of said support members, and arranged at intervals in the circumferential direction, and an impeller, A motor provided at one end of the rotation axis of the impeller, A stabilizer arranged at a distance from the outer periphery of the impeller over the rotation axis direction, A convex portion provided to protrude toward the impeller side on the surface of the stabilizer facing the impeller and arranged over the rotation axis direction, comprising: The end portion on the motor side in the rotation axis direction of the convex portion is arranged on the downstream side in the rotation direction of the impeller rather than the central portion of the convex portion in the rotation axis direction, A cross-flow fan in which the area of the surface of the end portion on the motor side in the rotation axis direction of the convex portion facing the impeller is larger than the area of the surface of the central portion of the convex portion in the rotation axis direction facing the impeller.

2. A plurality of support members arranged at a preset interval in the direction of the rotation axis, presenting a circular or annular flat plate shape, and a plurality of blades provided between adjacent said support members, near the outer periphery of said support members, and arranged at intervals in the circumferential direction, and an impeller, A motor provided at one end of the rotation axis of the impeller, A stabilizer arranged at a distance from the outer periphery of the impeller over the rotation axis direction, A convex portion provided to protrude toward the impeller side on the surface of the stabilizer facing the impeller and arranged over the rotation axis direction, comprising: The end portion on the motor side in the rotation axis direction of the convex portion is arranged on the downstream side in the rotation direction of the impeller rather than the central portion of the convex portion in the rotation axis direction, A cross-flow fan in which the surface of the convex portion facing the impeller is formed such that the distance from the impeller gradually decreases from the upstream side to the downstream side in the rotation direction of the impeller.

3. The cross-flow fan according to Claim 1 or Claim 2, wherein the end portion on the side opposite to the motor in the rotation axis direction of the convex portion is arranged on the downstream side in the rotation direction of the impeller rather than the central portion of the convex portion in the rotation axis direction.

4. The cross-flow fan according to any one of Claims 1 to 3, wherein the convex portion is smoothly continuous over the rotation axis direction.

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