Patent Application
20250216093
The present disclosure relates to an indoor unit and an air conditioner.
In the related art, an indoor unit of an air conditioner equipped with a cross-flow fan has been known. Inside such an indoor unit, a stabilizer that separates a suction flow path and a blowout flow path of the cross-flow fan from each other is provided. The stabilizer forms a circulating vortex at a boundary portion between the suction flow path and the blowout flow path. The circulating vortex may become larger in a case where a ventilation resistance of a suction port increases as an operation time of the indoor unit increases, and may cause condensation by drawing humid indoor air into a blowout port. Patent Document 1 discloses an indoor unit in which a protrusion is provided in a stabilizer in order to move a circulating vortex closer to a suction flow path and suppress the occurrence of a backflow.
Japanese Unexamined Patent Application, First Publication No. 2004-150789
In the indoor unit described in Patent Document 1, since the circulating vortex is moved closer to the suction flow path by providing the protrusion, there is a problem in that the circulating vortex collides with the stabilizer in a case where the ventilation resistance is low, conversely. In a case where the stabilizer and the circulating vortex collide with each other, there is a problem in that a pressure fluctuation at a collision zone increases, and a rotation sound of the cross-flow fan becomes louder.
In view of the above-described circumstances, an object of the present disclosure is to provide an indoor unit capable of suppressing the occurrence of internal condensation and the occurrence of noise, and an air conditioner including the indoor unit.
An aspect of an indoor unit according to the present disclosure is an indoor unit of an air conditioner, the indoor unit including: a heat exchanger: a cross-flow fan; a housing that includes a suction port and a blowout port and that accommodates the heat exchanger and the cross-flow fan therein: and a stabilizer that separates a suction flow path and a blowout flow path of the cross-flow fan from each other, in which the stabilizer includes a tongue portion that extends along an outer circumference surface of the cross-flow fan and that has a facing surface facing the cross-flow fan, a first protrusion portion that protrudes from the facing surface toward the cross-flow fan, and a second protrusion portion that protrudes from the facing surface toward the cross-flow fan and that is located closer to the blowout flow path than the first protrusion portion, the first protrusion portion has a first rectifying surface that faces the blowout flow path and is inclined toward a suction flow path toward a tip side of the first protrusion portion, the second protrusion portion has a second rectifying surface that faces the blowout flow path and that is inclined toward the suction flow path toward a tip side of the second protrusion portion, and the first rectifying surface and the second rectifying surface are each inclined toward the suction flow path at an acute inclination angle with respect to a radial direction of the rotation axis.
An aspect of an air conditioner according to the present disclosure includes: the indoor unit; and an outdoor unit.
According to the present disclosure, it is possible to provide an indoor unit capable of suppressing the occurrence of internal condensation and the occurrence of noise, and an air conditioner including the indoor unit.
Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. The scope of the present disclosure is not limited to the following embodiment, and can be changed in any way within the scope of technical ideas of the present disclosure. In addition, in the following drawings, a scale and the number in each structure may be different from a scale and the number in an actual structure to facilitate understanding of each configuration.
In addition, in the drawings, an X-axis, a Y-axis, and a Z-axis are shown as appropriate. The X-axis indicates one direction in a horizontal direction. The Y-axis indicates another direction in the horizontal direction. The Z-axis indicates a vertical direction. In the following description, a horizontal direction along the X-axis is referred to as a “front-rear direction X”, a horizontal direction along the Y-axis is referred to as a “left-right direction Y”, and a vertical direction is referred to as a “vertical direction Z”. The front-rear direction X, the left-right direction Y, and the vertical direction Z are directions orthogonal to each other. In the following description, a side (+Z side) in the vertical direction Z to which an arrow on the Z-axis points is defined as an upper side, and a side (−Z side) in the vertical direction Z opposite to the side to which the arrow on the Z-axis points is defined as a lower side. In addition, a side (+X side) of the front-rear direction X to which an arrow on the X-axis points is defined as a front side, and a side (−X side) in the front-rear direction X opposite to the side to which the arrow on the X-axis points is defined as a rear side. In addition, the left-right direction Y is a left-right direction in a case in which the indoor unit of the embodiment described below is viewed from the front (+X side). That is, a side (+Y side) in the left-right direction Y to which an arrow on the Y-axis points is defined as a right side, and a side (−Y side) in the left-right direction Y opposite to the side to which the arrow on the Y-axis points is defined as a left side.
The air conditioner 100 enables heat exchange between the refrigerant 19 flowing inside the circulation path portion 18 and the air in a room in which the indoor unit 20 is disposed, thereby regulating a temperature of the air in the room. Examples of the refrigerant 19 include a fluorine-based refrigerant having a low global warming potential (GWP) and a hydrocarbon-based refrigerant.
The outdoor unit 10 includes a housing 11, a compressor 12, a heat exchanger 13, a flow regulating valve 14, a blower 15, a four-way valve 16, and a control unit 17. The compressor 12, the heat exchanger 13, the flow regulating valve 14, the blower 15, the four-way valve 16, and the control unit 17 are accommodated inside the housing 11.
The compressor 12, the heat exchanger 13, the flow regulating valve 14, and the four-way valve 16 are provided parts of the circulation path portion 18 located inside the housing 11. The compressor 12, the heat exchanger 13, the flow regulating valve 14, and the four-way valve 16 are connected by the parts of the circulation path portion 18 located inside the housing 11.
The four-way valve 16 is provided in a part of the circulation path portion 18 connected to a discharge side of the compressor 12. The four-way valve 16 can reverse a direction of the refrigerant 19 flowing inside the circulation path portion 18 by switching between paths of parts of the circulation path portion 18. In a case where the paths connected by the four-way valve 16 are the paths indicated by solid lines in the four-way valve 16 in
The indoor unit 20 includes a housing 21, a heat exchanger 22, a cross-flow fan 23 as a blower, and a control unit 24. The housing 21 accommodates the heat exchanger 22, the cross-flow fan 23, and the control unit 24 therein. The indoor unit 20 can perform a cooling operation for cooling the air in the room in which the indoor unit 20 is disposed and a heating operation for warming the air in the room in which the indoor unit 20 is disposed. In
In a case where the indoor unit 20 performs the cooling operation, the refrigerant 19 flowing inside the circulation path portion 18 flows in the direction indicated by the solid line arrow in
On the other hand, in a case where the indoor unit 20 performs the heating operation, the refrigerant 19 flowing inside the circulation path portion 18 flows in the direction indicated by the dashed line in
Next, the indoor unit 20 will be described in more detail.
As shown in
As shown in
The heat exchanger 22 has a first heat exchanger 22a, a second heat exchanger 22b, and a third heat exchanger 22c. The first heat exchanger 22a is located in front of the cross-flow fan 23. The first heat exchanger 22a extends in the vertical direction Z as viewed in the left-right direction Y. The second heat exchanger 22b and the third heat exchanger 22c are located above the cross-flow fan 23. The second heat exchanger 22b extends upward and obliquely rearward from an upper end portion of the first heat exchanger 22a as viewed in the left-right direction Y. The third heat exchanger 22c is located rearward of the second heat exchanger 22b. The third heat exchanger 22c extends downward and obliquely rearward from an upper end portion of the second heat exchanger 22b as viewed in the left-right direction Y.
The housing 21 has an outer shell member 21b and a wind path member 21a. The outer shell member 21b is a member that constitutes a part of an outer shell of the housing 21. The outer shell member 21b improves designability of an external appearance of the indoor unit 20. The outer shell member 21b has a substantially rectangular box shape that is open to the rear. An opening of the outer shell member 21b on the rear side is blocked by the wind path member 21a.
The wind path member 21a is a member that constitutes a part of a wind path through which the air suctioned into the housing 21 by the cross-flow fan 23 passes. The wind path member 21a is hooked on an installation plate (not shown) that is fixed to the wall surface WS. Accordingly, the indoor unit 20 is fixed to the wall surface WS.
The wind path member 21a includes a casing portion 29. The casing portion 29 extends along an outer circumference of the cross-flow fan 23 on a rear side of the cross-flow fan 23. The casing portion 29 is gradually spaced apart from the outer circumference of the cross-flow fan 23 toward a lower side of the casing portion 29. A blowout flow path F2 of the cross-flow fan 23 is formed in a gap between the cross-flow fan 23 and the casing portion 29 on a lower side of the cross-flow fan 23. In the present specification, the “outer circumference of the cross-flow fan” means a cylindrical plane of a rotation trajectory of radially outer end portions of the blades 23a provided in the cross-flow fan 23.
The housing 21 has a suction port 20a and a blowout port 20b. In the present embodiment, the suction port 20a and the blowout port 20b are formed in the outer shell member 21b. The suction port 20a opens upward and extends in the axial direction. A filter 40 is disposed in the suction port 20a. On the other hand, the blowout port 20b opens forward and downward and extends in the axial direction. A wind direction adjusting portion 25 is disposed in the blowout port 20b. The wind direction adjusting portion 25 has a left-right wind direction vane 25a that adjusts a wind direction in the left-right direction Y and an up-down wind direction vane 25b that adjusts a wind direction in the vertical direction Z.
The air in the room is suctioned into an inside of the housing 21 from the suction port 20a by drive of the cross-flow fan 23. The air suctioned into the housing 21 from the suction port 20a passes through the filter 40 and then flows to the heat exchanger 22. The filter 40 captures at least some of dust contained in the air passing through the filter 40. Furthermore, the air suctioned into the housing 21 by the cross-flow fan 23 is blown into the room from the blowout port 20b. The air passing through the blowout port 20b is blown into the room in the vertical direction Z and in the left-right direction Y separately by the wind direction adjusting portion 25.
The indoor unit 20 has a stabilizer 30. The stabilizer 30 is disposed inside the housing 21. The stabilizer 30 is disposed on a lower side of the suction flow path F1 and on an upper side of the blowout flow path F2. The stabilizer 30 separates the suction flow path F1 and the blowout flow path F2 of the cross-flow fan 23 from each other. The stabilizer 30 extends from a panel on a front surface side of the housing 21 toward the lower side of the cross-flow fan 23. The stabilizer 30 is located on a lower side of the first heat exchanger 22a.
The stabilizer 30 includes a top surface 35b located on the upper side of the blowout flow path F2. The top surface 35b of the present embodiment faces the lower side. The top surface 35b is provided with the left-right wind direction vane 25a and the up-down wind direction vane 25b.
The stabilizer 30 is a resin molded product. The stabilizer 30 has a tongue portion 35, a first protrusion portion 31, a second protrusion portion 32, and a side plate portion 39. The tongue portion 35, the first protrusion portion 31, and the second protrusion portion 32 extend over an entire axial length of the cross-flow fan 23. That is, right end portions of the tongue portion 35, the first protrusion portion 31, and the second protrusion portion 32 are located on the right side (+Y side) with respect to a right end portion of the cross-flow fan 23. Left end portions of the tongue portion 35, the first protrusion portion 31, and the second protrusion portion 32 are located on the left side (−Y side) with respect to a left end portion of the cross-flow fan 23.
As shown in
The tongue portion 35 is provided with the facing surface 35a that faces the cross-flow fan 23. The facing surface 35a faces an inner side in the radial direction. The facing surface 35a extends in the axial direction in a uniform shape.
The tongue portion 35 has an end portion 35c located closer to a blowout flow path F2. In the following description, the end portion of the tongue portion 35 closer to the blowout flow path F2 is simply referred to as an end portion 35c. The end portion 35c forms a curved surface that smoothly curves between the facing surface 35a and the top surface 35b of the blowout port 20b. As shown in
The first protrusion portion 31 protrudes from the facing surface 35a of the tongue portion 35 toward the cross-flow fan 23. Similarly, the second protrusion portion 32 protrudes from the facing surface 35a of the tongue portion 35 toward the cross-flow fan 23. The second protrusion portion 32 is located closer to the blowout flow path F2 than the first protrusion portion 31.
The tongue portion 35 and the first protrusion portion 31 according to the present embodiment are each plate-shaped. That is, the first protrusion portion 31 has a rib shape that extends from the tongue portion 35. Therefore, it is possible to suppress a local increase in thickness of the tongue portion 35 at a connection portion with the first protrusion portion 31. Therefore, in a case where the tongue portion 35 is manufactured by die molding, the generation of a sink mark in the tongue portion 35 during the molding can be suppressed, and as a result, dimensional accuracy of each portion of the stabilizer 30 can be increased.
In addition, in the present embodiment, a recess portion 36 is provided between the first protrusion portion 31 and the tongue portion 35. The recess portion 36 is a space surrounded by the first protrusion portion 31 and the tongue portion 35. By forming the recess portion 36 between the first protrusion portion 31 and the tongue portion 35, rigidity of the first protrusion portion 31 and the tongue portion 35 can be increased.
In addition, the recess portion 36 according to the present embodiment opens toward the upper side. Therefore, condensation water generated in the housing 21 can be retained in the recess portion 36, and even in a case where the condensation water is generated in the housing 21, dripping of the condensation water into the room from the blowout port 20b can be suppressed. Furthermore, the recess portion 36 of the present embodiment is disposed directly below a front end (end portion on the +X side) of the cross-flow fan 23. Therefore, the recess portion 36 can efficiently receive the condensation water dripped from the front end of the cross-flow fan 23.
The second protrusion portion 32 of the present embodiment has a triangular shape as viewed in the axial direction of the cross-flow fan 23. That is, the second protrusion portion 32 is constituted by two surfaces, that is, a flat second rectifying surface (rectifying surface) 32a facing the blowout flow path F2 and a flat opposite side surface 32b facing the suction flow path F1. As will be described below, the second protrusion portion 32 has a lower protruding height than the first protrusion portion 31. Therefore, by causing the second protrusion portion 32 to have a triangular shape, it is easier to make the thickness of the tongue portion 35 uniform compared to a case where the second protrusion portion 32 has a plate shape like the first protrusion portion 31. According to the present embodiment, the generation of a sink mark in the second protrusion portion 32 after the molding can be suppressed, and the dimensional accuracy of each portion of the stabilizer 30 can be increased.
In the following description, a state in which the first circulating vortex V1 as shown in
As shown in
A blowout region A is provided between the circulating vortices V1 and V2 and the casing portion 29. The blowout region A is a region extending in the front-rear direction and the left-right direction Y of the blowout flow path F2. The air passing through the blowout region A among the air discharged from the cross-flow fan 23 flows into the room from the blowout port 20b. On the other hand, the air that passes through a front side (+X side) of the blowout region A of the air discharged from the cross-flow fan 23 circulates inside and outside the cross-flow fan 23 as the circulating vortices V1 and V2.
In the indoor unit 20 shown in
As shown in
According to the present embodiment, the first protrusion portion 31 is provided on the facing surface 35a of the tongue portion 35. The first protrusion portion 31 functions as a starting point 8a on the suction flow path F1 side of the first circulating vortex V1 that increases as the ventilation resistance increases. That is, the air of the first circulating vortex V1 flows from the blowout flow path F2 side to the suction flow path F1 side along the facing surface 35a of the tongue portion 35, hits the first protrusion portion 31, is blown up to the upper side, and enters the inside of the cross-flow fan 23. According to the present embodiment, a position of the starting point 8a of the first circulating vortex V1 in the case where the ventilation resistance increases can be stabilized. This can suppress the narrowing of the blowout region A of the first circulating vortex V1 (−X side), thereby suppressing the back flow of the indoor air from the blowout port 20b. As a result, not only can the blowing efficiency by the cross-flow fan 23 be enhanced, but also the occurrence of condensation on the blades 23a of the cross-flow fan 23 during the cooling operation can be suppressed.
The first protrusion portion 31 of the present embodiment extends over the entire axial length of the cross-flow fan 23. Therefore, the starting point 8a of the first circulating vortex V1 can be set to the same position at any location in the axial direction. That is, according to the present embodiment, the first circulating vortex V1 having the same shape can be stably formed at any position in the axial direction.
As shown in
According to the present embodiment, the second protrusion portion 32 is provided on the facing surface 35a of the tongue portion 35 in addition to the first protrusion portion 31. The second protrusion portion 32 is located closer to the blowout flow path F2 than the first protrusion portion 31. The second protrusion portion 32 functions as a starting point 8b on the suction flow path F1 side of the second circulating vortex V2. That is, the air of the second circulating vortex V2 flows from the blowout flow path F2 side to the suction flow path F1 side along the facing surface 35a of the tongue portion 35, hits the second protrusion portion 32, is blown up to the upper side, and enters the inside of the cross-flow fan 23. According to the present embodiment, the starting point 8b of the second circulating vortex V2 can be stabilized on the blowout flow path F2 side with respect to the first circulating vortex V1.
Accordingly, the air of the second circulating vortex V2 is likely to flow along the facing surface 35a of the tongue portion 35 without colliding with the end portion 35c of the tongue portion 35, and the pressure fluctuation in the vicinity of the end portion 35c of the tongue portion is reduced, so that the rotation sound of the cross-flow fan 23 can be reduced.
The second protrusion portion 32 according to the present embodiment extends over the entire axial length of the cross-flow fan 23. Therefore, the starting point 8b of the second circulating vortex V2 can also be the same position at any location in the axial direction. That is, according to the present embodiment, the second circulating vortex V2 having the same shape can be stably formed at any position in the axial direction.
As shown in
The first circulating vortex V1 in the first state flows along the facing surface 35a of the tongue portion 35, hits the first protrusion portion 31 after crossing the second protrusion portion 32, and is blown up to the upper side. By causing the second gap C2 to be larger than the first gap C1, the first circulating vortex VI can easily pass through between the first protrusion portion 31 and the cross-flow fan 23. In addition, by causing the first gap Cl to be smaller than the second gap C2, the first circulating vortex V1 can easily hit the first protrusion portion 31, and the first protrusion portion 31 can function as the starting point 8a of the first circulating vortex V1. On the other hand, since the second circulating vortex V2 in the second state is a relatively small vortex, it is difficult for the second circulating vortex V2 to cross the second protrusion portion 32 even in a case where the second gap C2 is relatively wide, and the second circulating vortex V2 hits the second protrusion portion 32 and is blown up to the upper side.
As shown in
In the present embodiment, the first gap C1 is the narrowest gap between the stabilizer 30 and the cross-flow fan 23. In addition, the second gap C2 is the second narrowest gap between the stabilizer 30 and the cross-flow fan 23. That is, portions of the tongue portion 35 except the first protrusion portion 31 and the second protrusion portion 32 are not closer to the cross-flow fan 23 than the first protrusion portion 31 and the second protrusion portion 32. According to the present embodiment, functioning of the portions of the tongue portion 35 other than the first protrusion portion 31 and the second protrusion portion 32 as the starting point can be suppressed, and the starting point of the circulating vortex can be easily controlled by the first protrusion portion 31 and the second protrusion portion 32.
As shown in
According to the present embodiment, a ratio of an angle a between the first imaginary line L1 and the second imaginary line L2 to an angle y between the first imaginary line L1 and the third imaginary line L3 is larger than 50%. That is, the second protrusion portion 32 is disposed between the end portion 35c of the tongue portion 35 and the first protrusion portion 31 to be biased toward an end portion 35c side of the tongue portion 35.
In a case where the second protrusion portion 32 is disposed to be biased toward a first protrusion portion 31, the second circulating vortex V2 is likely to collide with the end portion 35c of the tongue portion 35 in the second state, and an effect of reducing the pressure fluctuation in the vicinity of the end portion 35c of the tongue portion 35 cannot be sufficiently obtained. According to the present embodiment, by disposing the second protrusion portion 32 to be biased toward the end portion 35c side of the tongue portion 35, the starting point 8b of the second circulating vortex V2 can be disposed sufficiently to the rear side (−X side). Accordingly, the air of the second circulating vortex V2 can easily flow along the facing surface 35a of the tongue portion 35.
In addition, the ratio of the angle a between the first imaginary line L1 and the second imaginary line L2 to the angle y between the first imaginary line L1 and the third imaginary line L3 is preferably less than 62%. In a case where the ratio of the angle a to the angle γ is too large, the second circulating vortex V2 formed in the second state is biased to the rear side (−X side) too much, the blowout region A is narrowed in the front-rear direction, and the air volume passing through the blowout flow path F2 is reduced, which may deteriorate aerodynamic performance. According to the present embodiment, by setting the ratio of the angle a to the angle γ to be less than 62%, a width of the blowout region A can be sufficiently secured, and the air volume of the blowout flow path F2 can be sufficiently secured.
The first protrusion portion 31 has a first rectifying surface 31a that faces the blowout flow path F2. The first rectifying surface 31a is inclined toward the suction flow path F1 toward a tip side of the first protrusion portion 31. Furthermore, the first rectifying surface 31a of the present embodiment has a first inclined portion 31e and a second inclined portion 31f, which have different inclination angles from each other. The first inclined portion 31e is disposed on a root side of the first protrusion portion 31, and the second inclined portion 31f is disposed on a tip side of the first protrusion portion 31. That is, the second inclined portion 31f is located closer to the tip side of the first protrusion portion 31 than the first inclined portion 31e.
The inclination angle of the first inclined portion 31e with respect to the fourth imaginary line (imaginary line) L4 extending from the rotation axis R of the cross-flow fan 23 toward the first inclined portion 31e in the radial direction is referred to as a first inclination angle θ1. In addition, the inclination angle of the second inclined portion 31f with respect to the first imaginary line L1 extending from the rotation axis R toward the second inclined portion 31f in the radial direction is referred to as a second inclination angle 02. The first inclination angle θ1 and the second inclination angle θ2 are the inclination angles of the first inclined portion 31e and the second inclined portion 31f with respect to the radial direction of the rotation axis R.
In the present embodiment, the first inclination angle θ1 and the second inclination angle θ2 are each an acute angle. Therefore, the first rectifying surface 31a of the first protrusion portion 31 is inclined at an acute angle with respect to the radial direction toward the suction flow path F1 over an entire region from the root side to the tip side.
In a case where the first rectifying surface 31a is parallel to the radial direction of the rotation axis R or is inclined toward the blowout flow path F2, there is a concern that the first circulating vortex V1 collides with the first rectifying surface 31a, causing a large pressure fluctuation, and increasing the rotation sound of the cross-flow fan 23. According to the present embodiment, since the first rectifying surface 31a is inclined at an acute angle with respect to the radial direction of the rotation axis R toward the suction flow path F1, the first circulating vortex V1 can be smoothly guided to the inside of the cross-flow fan 23 at the first protrusion portion 31.
In the present embodiment, the second inclination angle θ2 is larger than the first inclination angle θ1. That is, the second inclined portion 31f has a larger inclination angle with respect to the radial direction of the cross-flow fan 23 than the first inclined portion 31e. Therefore, the first protrusion portion 31 steeply rises from the facing surface 35a in the first inclined portion 31e, and gently inclines toward the rotation direction of the cross-flow fan 23 in the second inclined portion 31f on the tip side.
As described above, the air of the first circulating vortex V1 passes through between the facing surface 35a of the tongue portion 35 and the outer circumference of the cross-flow fan 23. In addition, the air of the first circulating vortex V1 hits the first protrusion portion 31 after crossing the second protrusion portion 32. The air of the first circulating vortex V1 passes through a region that is biased toward the cross-flow fan 23 than the tip of the second protrusion portion 32 by crossing the second protrusion portion 32. Therefore, the air of the first circulating vortex V1 is more likely to hit a region of the first rectifying surface 31a of the first protrusion portion 31, which is close to the cross-flow fan 23 (that is, the second inclined portion 31f), and is less likely to hit the first inclined portion 31e located on the root side of the first protrusion portion 31.
According to the present embodiment, by forming the first inclined portion 31e into the steep shape, the first protrusion portion 31 can be reduced in the front-rear direction. In addition, according to the present embodiment, since the first rectifying surface 31a has a bent shape on the tip side, the rigidity of the first protrusion portion 31 can be increased compared to a case where the entire first rectifying surface 31a is inclined at a uniform inclination angle.
The second protrusion portion 32 has the second rectifying surface 32a that faces the blowout flow path F2. The second rectifying surface 32a is inclined toward the suction flow path F1 toward a tip side of the second protrusion portion 32. An inclination angle of the second rectifying surface 32a with respect to the second imaginary line (imaginary line) L2 extending in the radial direction from the rotation axis R of the cross-flow fan 23 toward the second rectifying surface 32a is referred to as a third inclination angle θ3. The first inclination angle θ1 and the second inclination angle θ2 are the inclination angles of the first rectifying surface 31a with respect to the radial direction of the rotation axis R. In the present embodiment, the second rectifying surface 32a of the second protrusion portion 32 is inclined at an acute angle with respect to the radial direction of the rotation axis R over an entire region from a root side to the tip side.
In a case where the second rectifying surface 32a is parallel to the radial direction of the rotation axis R or is inclined toward the blowout flow path F2, there is a concern that the second circulating vortex V2 collides with the second rectifying surface 32a, causing a large pressure fluctuation, and increasing the rotation sound of the cross-flow fan 23. According to the present embodiment, since the second rectifying surface 32a is inclined at an acute angle with respect to the radial direction of the rotation axis R toward the suction flow path F1, the first circulating vortex V1 can be smoothly guided to the inside of the cross-flow fan 23 at the second protrusion portion 32.
As described above, each configuration and each method described in the present specification can be combined as appropriate within the scope in which all of these do not contradict each other.
For example, in the embodiment described above, a case where the suction port 20a is disposed on the upper side and the blowout port 20b is disposed on the lower side with respect to the cross-flow fan 23 has been described. However, the disposition of the suction port 20a and the blowout port 20b with respect to the cross-flow fan 23 is not limited to the embodiment.
This application is a U.S. national stage application of International Application No. PCT/JP2022/015899 filed Mar. 30, 2022, the contents of which are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2022/015899 | 3/30/2022 | WO |
