Indoor unit of air conditioner and air conditioner

Abstract

To reduce noise generated from an indoor unit and furthermore to suppress reduction in air volume.SOLUTION: An indoor unit of an air conditioner of the present disclosure includes: a housing in which an air suction port and a wind outlet are provided; an indoor heat exchanger exchanging heat between an indoor air taken in from the air suction port; an indoor fan sending the heat-exchanged indoor air in the indoor heat exchanger to the wind outlet; and a rear guider having a guide surface guiding the indoor air to the wind outlet. The indoor fan is a cross flow fan, and includes: a plurality of blades; and a plurality of partitioning panels provided in a direction along a rotational center axis of the indoor fan with an interval therebetween and for partitioning the plurality of blades. The rear guider includes: a first projection provided at a position higher than the rotational center axis; and a plurality of second projections provided on a downstream of the first projection. The first projection continuously extends, and the plurality of second projections are arranged with an interval therebetween and face the plurality of partitioning panel.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an indoor unit of an air conditioner and an air conditioner. [Background technology]

[0002] For example, Patent Document 1 discloses an air conditioner equipped with a crossflow fan having an impeller and a rear guider having an opposing surface that faces the impeller in the radial direction. In the air conditioner described in Patent Document 1, the opposing surface has a closest part that is closest to the impeller. A backflow suppression means is provided downstream in the rotation direction of the opposing surface from the closest part to suppress the occurrence of a backflow, which is an airflow that flows in the opposite direction to the rotation direction through the gap between the impeller and the closest part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-92073 A Summary of the Invention [Problem to be solved by the invention]

[0004] The air conditioner described in Patent Document 1 still has room for improvement in terms of reducing noise from the indoor unit while suppressing a decrease in air volume.

[0005] The present disclosure provides an indoor unit for an air conditioner that can suppress a decrease in airflow while reducing noise from the indoor unit, and the air conditioner. [Means for solving the problem]

[0006] An indoor unit of an air conditioner according to one aspect of the present disclosure includes: A housing provided with an intake port and an exhaust port for indoor air; an indoor heat exchanger that is disposed within the housing and exchanges heat with the indoor air drawn in through the air inlet; an indoor fan that is disposed between the indoor heat exchanger and the air outlet in the housing and that blows the indoor air that has been heat exchanged in the indoor heat exchanger to the air outlet; a rear guider disposed downstream of the indoor fan and having a guide surface that guides the indoor air blown by the indoor fan to the air outlet; Equipped with The indoor fan is a cross-flow fan, A plurality of blades arranged around a central rotation axis of the indoor fan; a plurality of partition plates that are spaced apart from one another in a direction along the central axis of rotation of the indoor fan and that separate the plurality of blades; having The rear guider is a first protrusion provided at a position higher than the rotation central axis of the indoor fan and protruding from the guide surface toward the indoor fan; a plurality of second protrusions provided at a position higher than the rotation central axis of the indoor fan and downstream of the first protrusion, the second protrusions protruding from the guide surface toward the indoor fan; having the first protrusion extends continuously in a direction along the central axis of rotation of the indoor fan, The multiple second protrusions are arranged at intervals in a direction along the central rotation axis of the indoor fan and face the multiple partition plates in a direction perpendicular to the central rotation axis of the indoor fan.

[0007] An air conditioner according to one aspect of the present disclosure includes the indoor unit of the above-described aspect and an outdoor unit. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide an indoor unit for an air conditioner and an air conditioner that can suppress a decrease in air volume while reducing noise of the indoor unit. [Brief description of the drawings]

[0009] [Figure 1]Schematic diagram of an air conditioner according to a first embodiment of the present disclosure. [Diagram 2] FIG. 1 is a schematic perspective view showing an internal configuration of an indoor unit; [Diagram 3] Schematic front view showing the internal configuration of the indoor unit [Figure 4] Schematic front view showing the rear guider [Diagram 5] Schematic side view showing the internal configuration of the indoor unit [Figure 6] Schematic enlarged view of the Z1 part of the internal structure of the indoor unit in Figure 5 [Figure 7] FIG. 1 is a schematic plan view showing a second projection; [Figure 8] Schematic front view showing the second projection DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Background to this disclosure) In the field of air conditioners, indoor units are known that are provided with a protrusion on the part of the rear guider that faces the crossflow fan. The protrusion is provided downstream of the closest part of the rear guider that is closest to the crossflow fan. This suppresses the occurrence of backflow, i.e., air flow in the opposite direction to the rotation direction of the crossflow fan that occurs in the gap between the crossflow fan and the rear guider, thereby reducing fan noise.

[0011] However, the protrusions increase the resistance to the airflow blown out of the crossflow fan, which reduces the amount of airflow. In addition, if the resistance to the airflow increases due to dust clogging the filter, for example, abnormal intermittent noise (surging) may occur.

[0012] The present inventors therefore investigated the configuration of an indoor unit for an air conditioner that reduces noise while suppressing a decrease in airflow by devising an ingenious arrangement of protrusions, and arrived at the present disclosure.

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings in some cases. However, the following embodiments are examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following contents (e.g., the shape, dimensions, arrangement, etc. of each component). Positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified. Each figure described in the following embodiments is a schematic diagram, and the size and thickness ratios of each component in each figure do not necessarily reflect the actual dimensional ratios. Furthermore, the dimensional ratios of each element are not limited to the ratios shown in the drawings.

[0014] In the following description, when it is necessary to distinguish between multiple components, prefixes such as "first" and "second" are added to the names of the components. However, when the components can be distinguished from one another by the symbols added to them, the prefixes such as "first" and "second" may be omitted in consideration of readability of the text.

[0015] (Embodiment 1) [Overall configuration] FIG. 1 is a schematic diagram of an air conditioner 10 according to a first embodiment of the present disclosure.

[0016] As shown in FIG. 1, an air conditioner 10 according to this embodiment includes an indoor unit 20 arranged in a room Rin to be air-conditioned, an outdoor unit 30 arranged in the outdoor Rout, and refrigerant piping 50.

[0017] <Indoor unit> The indoor unit 20 has a housing 21, an indoor heat exchanger 22, an indoor fan 23, and a rear guider 24.

[0018] An inlet 21a and an outlet 21b for the indoor air A1 are provided in a housing 21 of the indoor unit 20. In the housing 21, an indoor heat exchanger 22, an indoor fan 23, and a rear guider 24 are arranged.

[0019] The indoor heat exchanger 22 exchanges heat with the indoor air A1 sucked in through the suction port 21a.

[0020] The indoor fan 23 is disposed between the indoor heat exchanger 22 and the air outlet 21b, and blows, to the air outlet 21b, the indoor air A1 that has been heat exchanged in the indoor heat exchanger 22. The indoor fan 23 is a cross-flow fan.

[0021] The rear guider 24 is disposed downstream of the indoor fan 23, and has a guide surface 24a that guides the indoor air A1 blown by the indoor fan 23 to the outlet 21b. The guide surface 24a is provided facing the indoor fan 23.

[0022] <Outdoor unit> The outdoor unit 30 has an outdoor heat exchanger 32, an outdoor fan 34, a compressor 36, an expansion valve 38, and a four-way valve 40.

[0023] The outdoor heat exchanger 32 exchanges heat with the outdoor air A2.

[0024] The outdoor fan 34 draws the outdoor air A2 into the outdoor unit 30, and blows the outdoor air A2 after exchanging heat with the outdoor heat exchanger 32 out to the outdoor Rout.

[0025] A compressor 36, an expansion valve 38, and a four-way valve 40 execute a refrigeration cycle together with the indoor heat exchanger 22 and the outdoor heat exchanger 32.

[0026] The refrigerant piping 50 connects the outdoor heat exchanger 32, the compressor 36, the expansion valve 38, the four-way valve 40, and the indoor heat exchanger 22. The refrigerant piping 50 circulates a refrigerant.

[0027] When the air conditioner 10 performs cooling operation and dehumidification operation (weak cooling operation), the refrigeration cycle is performed by the refrigerant flowing in order from the compressor 36 through the four-way valve 40, the outdoor heat exchanger 32, the expansion valve 38, the indoor heat exchanger 22, and returning to the compressor 36. When the air conditioner performs heating operation, the refrigeration cycle is performed by the refrigerant flowing in order from the compressor 36 through the four-way valve 40, the indoor heat exchanger 22, the expansion valve 38, the outdoor heat exchanger 32, and returning to the compressor 36.

[0028] [Internal structure of indoor unit] Fig. 2 is a schematic perspective view showing the internal configuration of the indoor unit 20. Fig. 3 is a schematic front view showing the internal configuration of the indoor unit 20. Fig. 4 is a schematic front view showing the rear guider 24. Fig. 5 is a schematic side view showing the internal configuration of the indoor unit 20. Fig. 6 is a schematic enlarged view of a Z1 portion of the internal configuration of the indoor unit 20 in Fig. 5. Note that some elements are omitted in Figs. 2 to 6 to simplify the explanation.

[0029] 2 and 3, the indoor fan 23 is a cross-flow fan. The indoor fan 23 has a plurality of blades 23a and a plurality of partition plates 23b.

[0030] The multiple blades 23a are arranged around a rotation central axis CL1 of the indoor fan 23. The multiple blades 23a are arranged at equal intervals on a concentric circle centered on the rotation central axis CL1.

[0031] The partition plates 23b are arranged at intervals in a direction along the rotation central axis CL1 of the indoor fan 23, and separate the blades 23a. The partition plates 23b are arranged perpendicular to the rotation central axis CL1. The blades 23a are arranged between the partition plates 23b. The partition plates 23b have, for example, a disk shape.

[0032] As shown in FIGS. 2 and 4 to 6, the rear guider 24 has a first protrusion 25 and a plurality of second protrusions 26.

[0033] The first protrusion 25 is provided at a position higher than the rotation central axis CL1 of the indoor fan 23, and protrudes from the guide surface 24a toward the indoor fan 23. For example, the first protrusion 25 forms a portion of the rear guider 24 that is closest to the indoor fan 23, i.e., a closest portion. The first protrusion 25 extends continuously in a direction along the rotation central axis CL1 of the indoor fan 23.

[0034] The first protrusion 25 has a convex shape formed by a smooth inclined surface when viewed from a direction along the rotation central axis CL1 of the indoor fan 23. For example, when viewed from a direction along the rotation central axis CL1 of the indoor fan 23, the first protrusion 25 has a mountain shape.

[0035] The first protrusion 25 is inclined in a direction away from the guide surface 24a of the rear guider 24 from the upstream of the first protrusion 25 toward the apex P1 of the first protrusion 25, and is inclined in a direction approaching the guide surface 24a of the rear guider 24 from the apex P1 of the first protrusion 25 toward the downstream. The apex P1 of the first protrusion 25 is a portion where the height of the first protrusion 25 is greatest when viewed from the direction along the rotation center axis CL1 of the indoor fan 23.

[0036] The second protrusions 26 are provided at a position higher than the rotation central axis CL1 of the indoor fan 23 and downstream of the first protrusion 25, and protrude from the guide surface 24a toward the indoor fan 23. The second protrusions 26 are arranged at intervals in a direction along the rotation central axis CL1 of the indoor fan 23. The second protrusions 26 face the partition plates 23b in a direction perpendicular to the rotation central axis CL1 of the indoor fan 23. The second protrusions 26 are arranged at the same intervals as the intervals at which the partition plates 23b are arranged. The second protrusions 26 are not provided in a portion where the partition plates 23b are not arranged in a direction perpendicular to the rotation central axis CL1 of the indoor fan 23.

[0037] The second protrusion 26 has a convex shape formed by a smooth inclined surface when viewed from a direction along the rotation central axis CL1 of the indoor fan 23. For example, the second protrusion 26 has a mountain shape when viewed from a direction along the rotation central axis CL1 of the indoor fan 23.

[0038] As shown in FIG. 6, the second projection 26 has a first inclined surface 26a and a second inclined surface 26b.

[0039] When viewed from a direction along the rotation central axis CL1 of the indoor fan 23, the first inclined surface 26a is inclined in a direction away from the guide surface 24a of the rear guider 24 from the upstream of the second protrusion 26 toward the apex P2 of the second protrusion 26. The apex P2 of the second protrusion 26 is a portion where the height of the second protrusion 26 is greatest when viewed from a direction along the rotation central axis CL1 of the indoor fan 23.

[0040] When viewed from a direction along the central axis of rotation CL1 of the indoor fan 23, the second inclined surface 26b is inclined in a direction approaching the guide surface 24a of the rear guider 24 from the apex P2 of the second protrusion 26 toward the downstream of the second protrusion 26.

[0041] For example, the angle between the first inclined surface 26a and the second inclined surface 26b is an obtuse angle, for example, not less than 145° and not more than 170°.

[0042] 3 and 4, the width T2 of the multiple second protrusions 26 is greater than the thickness T1 of the multiple partition plates 23b. The width T2 of the multiple second protrusions 26 is the dimension of the second protrusions 26 in a direction parallel to the rotation center axis CL1. For example, the width T2 of the second protrusions 26 is two or more times and six or less times the thickness T1 of the partition plate 23b. The width T2 of the second protrusions 26 refers to the largest width dimension of the second protrusions 26 in a plan view.

[0043] The positional relationship between the first protrusion 25 and the second protrusion 26 facing the partition plate 23b at the end of the indoor fan 23 when viewed from a direction along the central axis of rotation CL1 of the indoor fan 23 will be described using FIG.

[0044] 5, the first protrusion 25 and the second protrusion 26 are provided at a position higher than the rotation central axis CL1 when viewed from a direction along the rotation central axis CL1 of the indoor fan 23. In addition, the second protrusion 26 is provided downstream of the first protrusion 25.

[0045] 5, a first virtual straight line L1 passing through the apex P1 of the first projection 25 and the central axis of rotation CL1, and a second virtual straight line L2 passing through the apex P2 of the second projection 26 and the central axis of rotation CL1 are drawn. At this time, the angle θ1 between the first virtual straight line L1 and the second virtual straight line L2 is greater than 0° and smaller than 45°. Preferably, the angle θ1 is greater than 10° and less than 30°.

[0046] Although the positional relationship between the first protrusion 25 and the second protrusion 26 facing the partition plate 23b at the end of the indoor fan 23 has been described, the same applies to the positional relationship between the first protrusion 25 and the second protrusion 26 facing the partition plate 23b other than the partition plate 23b at the end of the indoor fan 23. That is, in each cross section obtained by cutting the multiple second protrusions 26 in a direction perpendicular to the rotation central axis CL1 of the indoor fan 23, the above-mentioned positional relationship between the first protrusion 25 and the second protrusion 26 is established.

[0047] As shown in FIG. 6, the distance D2 between the second protrusion 26 and the indoor fan 23 is greater than the distance D1 between the first protrusion 25 and the indoor fan 23, as viewed from the direction along the rotation central axis CL1 of the indoor fan 23. For example, the distance D2 is 1.05 times or less than the distance D1. For example, the distance D1 is a distance connecting the top P1 of the first protrusion 25 and the intersection point P3 between the first virtual straight line L1 and the outer periphery 23c of the partition plate 23b of the indoor fan 23, as viewed from the direction along the rotation central axis CL1 of the indoor fan 23. The distance D2 is a distance connecting the top P2 of the second protrusion 26 and the intersection point P4 between the second virtual straight line L2 and the outer periphery 23c of the partition plate 23b of the indoor fan 23, as viewed from the direction along the rotation central axis CL1 of the indoor fan 23. Note that when the distance D2 is greater than 1.05 times, surging occurs when the suction resistance increases. The occurrence of surging was confirmed in a soundproof wind tunnel test room.

[0048] When viewed from the direction along the rotation central axis CL1 of the indoor fan 23, the height H2 of the multiple second protrusions 26 is greater than the height H1 of the first protrusions 25. The height H1 of the first protrusions 25 is the distance from the guide surface 24a of the rear guider 24 to the apex P1 of the first protrusion 25, and the height H2 of the second protrusions 26 is the distance from the guide surface 24a of the rear guider 24 to the apex P2 of the second protrusion 26. For example, the height H1 of the first protrusions 25 is the distance connecting the apex P1 of the first protrusion 25 and the intersection P5 between the first virtual straight line L1 and the guide surface 24a of the rear guider 23 when viewed from the direction along the rotation central axis CL1 of the indoor fan 23. The height H2 of the second protrusion 26 is the distance connecting the top P2 of the second protrusion 26 and the intersection P6 between the second virtual straight line L2 and the guide surface 24a of the rear guider 23 when viewed from a direction along the rotation central axis CL1 of the indoor fan 23.

[0049] In the direction perpendicular to the central axis of rotation CL1 of the indoor fan 23, the length K2 of the multiple second protrusions 26 is greater than the length K1 of the first protrusions 25.

[0050] [Detailed structure of the second protrusion] Fig. 7 is a schematic plan view showing the second projection 26. Fig. 8 is a schematic front view showing the second projection 26.

[0051] As shown in FIG. 7, the length K22 of the second inclined surface 26b of the second protrusion 26 is greater than the length K21 of the first inclined surface 26a. The length K21 of the first inclined surface 26a and the length K22 of the second inclined surface 26b refer to dimensions in a direction perpendicular to the rotation central axis CL1 of the indoor fan 23. For example, the length K22 of the second inclined surface 26b is 1.17 times or more the length K21 of the first inclined surface 26a. When the length K22 of the second inclined surface 26b is smaller than 1.17 times the length K21 of the first inclined surface 26a, surging occurs when the suction resistance increases. The occurrence of surging was confirmed in a soundproof wind tunnel test room.

[0052] 7 and 8, the width of the second protrusion 26 decreases toward the apex P2. Specifically, the width T3 of the apex P2 of the second protrusion 26 is smaller than the width T2 of the second protrusion 26 at a portion connected to the guide surface 24a of the rear guider 24. In this embodiment, the second protrusion 26 has a substantially trapezoidal shape in a front view of the second protrusion 26, and the width T3 of the apex P2 of the second protrusion 26 is larger than the thickness T1 of the partition plate 23b.

[0053] [effect] According to the above-described embodiment, the following effects can be obtained.

[0054] The indoor unit 20 of the air conditioner 10 includes a housing 21, an indoor heat exchanger 22, an indoor fan 23, and a rear guider 24. The housing 21 is provided with an indoor air intake port 21a and an outlet port 21b. The indoor heat exchanger 22 is disposed within the housing 21 and exchanges heat with the indoor air drawn in from the intake port. The indoor fan 23 is disposed between the indoor heat exchanger 22 and the outlet port 21b within the housing and blows the indoor air that has been heat exchanged in the indoor heat exchanger 22 to the outlet port 21b. The rear guider 24 is disposed downstream of the indoor fan 23 and has a guide surface 24a that guides the indoor air blown by the indoor fan 23 to the outlet port 21b. The indoor fan 23 is a cross-flow fan and has a plurality of blades 23a and a plurality of partition plates 23b. The plurality of blades 23a are disposed around a rotation center axis CL1 of the indoor fan 23. The partition plates 23b are arranged at intervals in a direction along the rotation central axis CL1 of the indoor fan 23, and separate the blades 23a. The rear guider 24 has a first protrusion 25 and a plurality of second protrusions 26. The first protrusion 25 is provided at a position higher than the rotation central axis CL1 of the indoor fan 23, and protrudes from the guide surface 24a toward the indoor fan 23. The first protrusion 25 extends continuously in a direction along the rotation central axis of the indoor fan 23. The second protrusions 26 are provided at a position higher than the rotation central axis CL1 of the indoor fan 23 and downstream of the first protrusion 25, and protrude from the guide surface 24a toward the indoor fan 23. The second protrusions 26 are arranged at intervals in a direction along the rotation central axis CL1 of the indoor fan 23, and face the partition plates 23b in a direction perpendicular to the rotation central axis CL1 of the indoor fan 23.

[0055] With this configuration, the noise of the indoor unit 20 can be reduced while suppressing a decrease in the air volume. In the indoor unit 20, the speed of the indoor air A1 blown out is likely to decrease in the gap between the multiple partition plates 23b of the indoor fan 23 and the guide surface 24a of the rear guider 24, and noise is likely to occur. In the indoor unit 20, the guide surface 24a of the rear guider 24 is provided with multiple second protrusions 26 at positions facing the multiple partition plates 23b. This improves the speed of the indoor air A1 in the gap between the multiple partition plates 23b and the guide surface 24a of the rear guider 24, suppresses the generation of unstable airflow, and suppresses the generation of noise. This reduces noise. In particular, when the suction ventilation resistance increases due to dust or the like clogging the filter, intermittent abnormal noise (surging) can be reduced.

[0056] Moreover, in the indoor unit 20, the multiple second protrusions 26 are arranged at intervals in a direction along the central axis of rotation CL1 of the indoor fan 23. Therefore, the multiple second protrusions 26 are not arranged in the portions where the multiple partition plates 23b are not arranged, and the multiple second protrusions 26 suppress an increase in ventilation resistance. This makes it possible to suppress a decrease in the air volume.

[0057] In a cross section of each of the second projections 26 cut in a direction perpendicular to the central axis of rotation CL1 of the indoor fan 23, a first imaginary straight line L1 passing through the apex P1 of the first projection 25 and the central axis of rotation CL1, and a second imaginary straight line L2 passing through the apex P2 of the second projection 26 and the central axis of rotation CL1 are drawn. At this time, the angle θ1 between the first imaginary straight line L1 and the second imaginary straight line L2 is greater than 0° and smaller than 45°. With this configuration, it is possible to further reduce noise while suppressing a decrease in airflow.

[0058] When viewed from the direction along the central axis CL1 of rotation of the indoor fan 23, each of the second protrusions 26 has a first inclined surface 26a and a second inclined surface 26b. The first inclined surface 26a is inclined in a direction away from the guide surface 24a of the rear guider 24 from the upstream of the second protrusion 26 toward the apex P2 of the second protrusion 26. The second inclined surface 26b is inclined in a direction approaching the guide surface 24a of the rear guider 24 from the apex P2 of the second protrusion 26 toward the downstream of the second protrusion 26. With this configuration, the ventilation resistance in the second protrusions 26 can be reduced, and a decrease in the air volume can be further suppressed.

[0059] The length K22 of the second inclined surface 26b is greater than the length K21 of the first inclined surface 26a in a direction perpendicular to the rotation central axis CL1 of the indoor fan 23. With this configuration, the indoor air A1 flowing along the guide surface 24a of the rear guider 24 flows more smoothly over the multiple second protrusions 26, thereby further suppressing a decrease in the airflow.

[0060] A width T2 of the multiple second protrusions 26 in a direction parallel to the central axis of rotation CL1 of the indoor fan 23 is greater than a thickness T1 of the multiple partition plates 23b. With this configuration, it is possible to further reduce noise while suppressing a decrease in the airflow.

[0061] The width of the multiple second protrusions 26 decreases toward the apex P2. With this configuration, it is possible to further reduce the ventilation resistance at the multiple second protrusions 26, and the indoor air A1 flows smoothly around the multiple second protrusions 26, so that a decrease in the airflow can be further suppressed.

[0062] When viewed from the direction along the central axis CL1 of rotation of the indoor fan 23, the distance D2 between the multiple second protrusions 26 and the indoor fan 23 is greater than the distance D1 between the first protrusions 25 and the indoor fan 23. With this configuration, the reduction in airflow can be further suppressed.

[0063] When viewed from a direction along the central axis of rotation CL1 of the indoor fan 23, the height H2 of the multiple second protrusions 26 is greater than the height H1 of the first protrusions 25. With this configuration, it is possible to further reduce noise while suppressing a decrease in the airflow.

[0064] In a direction perpendicular to the central axis of rotation CL1 of the indoor fan 23, the length K2 of the multiple second protrusions 26 is greater than the length K1 of the first protrusions 25. With this configuration, it is possible to further reduce noise while suppressing a decrease in the airflow.

[0065] The air conditioner 10 includes the above-described indoor unit 20 and the outdoor unit 30. Even with this configuration, the same effects as those of the indoor unit 20 described above are achieved.

[0066] [Example] As Example 1, the air volume was measured using the indoor unit 10 of this embodiment. As Comparative Example 1, the air volume was measured using an indoor unit equipped with a rear guider without the second protrusion 26. The measurement results are shown in Table 1. Example 1 and Comparative Example 1 have the same configuration except for the presence or absence of the second protrusion 26. Note that, for Example 1 and Comparative Example 1, the air volume was measured in a soundproof wind tunnel test room. The indoor unit was installed so that the indoor unit suctioned on the upstream side of the wind tunnel and the air was blown out on the downstream side, and the air volume was measured. Also, in Example 1 and Comparative Example 1, it was investigated whether surging would occur by increasing the suction ventilation resistance.

[0067] [Table 1]

[0068] As shown in Table 1, in Example 1, it was possible to obtain an air volume equivalent to that of Comparative Example 1 which did not have the second protrusions 26. Furthermore, in Comparative Example 1, surging occurred when the suction ventilation resistance increased. On the other hand, in Example 1, surging did not occur when the suction ventilation resistance increased.

[0069] (Other embodiments) As described above, the above embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate.

[0070] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art, and such changes and modifications should be understood to be included within the scope of the present invention as defined by the appended claims, unless they depart therefrom.

[0071] (Outline of the embodiment) (1) An indoor unit of an air conditioner disclosed herein comprises a housing provided with an indoor air intake and exhaust port, an indoor heat exchanger disposed within the housing and performing heat exchange with the indoor air drawn in from the intake port, an indoor fan disposed within the housing between the indoor heat exchanger and the exhaust port and blowing the indoor air that has been heat exchanged in the indoor heat exchanger to the exhaust port, and a rear guider disposed downstream of the indoor fan and having a guide surface that guides the indoor air blown by the indoor fan to the exhaust port, the indoor fan being a crossflow fan having a plurality of blades disposed around a central axis of rotation of the indoor fan and a rear guider that is arranged in a direction along the central axis of rotation of the indoor fan. and a plurality of partition plates arranged at intervals in the direction along the rotation central axis of the indoor fan and separating the plurality of blades, the rear guider having a first protrusion provided at a position higher than the rotation central axis of the indoor fan and protruding from the guide surface toward the indoor fan, and a plurality of second protrusions provided at a position higher than the rotation central axis of the indoor fan and downstream of the first protrusion and protruding from the guide surface toward the indoor fan, the first protrusion extending continuously in a direction along the rotation central axis of the indoor fan, and the plurality of second protrusions are arranged at intervals in the direction along the rotation central axis of the indoor fan and face the plurality of partition plates in a direction perpendicular to the rotation central axis of the indoor fan.

[0072] (2) In the indoor unit of the air conditioner of (1), when a first imaginary line passing through the top of the first protrusion and the central axis of rotation and a second imaginary line passing through the top of the second protrusion and the central axis of rotation are drawn in a cross section of each of the multiple second protrusions cut in a direction perpendicular to the central axis of rotation of the indoor fan, the angle between the first imaginary line and the second imaginary line may be greater than 0° and less than 45°.

[0073] (3) In an indoor unit of an air conditioner of (1) or (2), when viewed from a direction along the central axis of rotation of the indoor fan, each of the multiple second protrusions may have a first inclined surface that slopes away from the guide surface of the rear guider from the upstream of the second protrusion toward the top of the second protrusion, and a second inclined surface that slopes toward the guide surface of the rear guider from the top of the second protrusion toward the downstream of the second protrusion.

[0074] (4) In the indoor unit of the air conditioner of (3), a length of the second inclined surface may be greater than a length of the first inclined surface in a direction perpendicular to the central axis of rotation of the indoor fan.

[0075] (5) In an indoor unit of any one of the air conditioners (1) to (4), a width of the multiple second protrusions in a direction parallel to the central axis of rotation of the indoor fan may be greater than a thickness of the multiple partition plates.

[0076] (6) In the air conditioner indoor unit of (5), the width of the multiple second protrusions may decrease toward an apex.

[0077] (7) In an indoor unit of any one of the air conditioners (1) to (6), when viewed from a direction along the central axis of rotation of the indoor fan, the distance between the multiple second protrusions and the indoor fan may be greater than the distance between the first protrusion and the indoor fan.

[0078] (8) In an indoor unit of any one of the air conditioners (1) to (7), when viewed from a direction along the central axis of rotation of the indoor fan, the height of the multiple second protrusions may be greater than the height of the first protrusions.

[0079] (9) In the indoor unit of any one of the air conditioners (1) to (8), the length of the multiple second protrusions may be greater than the length of the first protrusions in a direction perpendicular to the central axis of rotation of the indoor fan.

[0080] (10) An air conditioner of the present disclosure includes an indoor unit selected from the group consisting of (1) to (9) and an outdoor unit. [Industrial Applicability]

[0081] The present disclosure is applicable to indoor units of air conditioners. [Explanation of symbols]

[0082] 10. Air conditioners 20 Indoor unit 21 Case 21a Intake port 21b Air outlet 22 Indoor heat exchanger 23 Indoor fan 23a Feather 23b Partition 23c outer circumference 24 Rear Guide 24a Guide surface 25 1st protrusion 26 2nd protrusion 26a 1st slope 26b 2nd slope 30 Outdoor unit 32 Outdoor heat exchanger 34 Outdoor fan 36 Compressor 38 Expansion valve 40 Four-way valve 50 Refrigerant piping

Claims

1. A housing provided with an intake port and an exhaust port for indoor air; an indoor heat exchanger that is disposed within the housing and exchanges heat with the indoor air drawn in through the air inlet; an indoor fan that is disposed between the indoor heat exchanger and the air outlet in the housing and that blows the indoor air that has been heat exchanged in the indoor heat exchanger to the air outlet; a rear guider disposed downstream of the indoor fan and having a guide surface that guides the indoor air blown by the indoor fan to the air outlet; Equipped with The indoor fan is a cross-flow fan, A plurality of blades arranged around a central rotation axis of the indoor fan; a plurality of partition plates that are spaced apart from one another in a direction along the central axis of rotation of the indoor fan and that separate the plurality of blades; having The rear guider is a first protrusion provided at a position higher than the rotation central axis of the indoor fan and protruding from the guide surface toward the indoor fan; a plurality of second protrusions provided at a position higher than the rotation central axis of the indoor fan and downstream of the first protrusion, the second protrusions protruding from the guide surface toward the indoor fan; having The first protrusion extends continuously in a direction along the rotation central axis of the indoor fan, The second protrusions are arranged at intervals in a direction along the central axis of rotation of the indoor fan and face the partition plates in a direction perpendicular to the central axis of rotation of the indoor fan. Air conditioner indoor unit.

2. When a first virtual line passing through a top of the first projection and the rotation central axis and a second virtual line passing through the top of the second projection and the rotation central axis are drawn in each cross section obtained by cutting the plurality of second projections in a direction perpendicular to the rotation central axis of the indoor fan, The angle between the first virtual line and the second virtual line is greater than 0° and smaller than 45°. An indoor unit for an air conditioner according to claim 1.

3. When viewed from a direction along the central axis of rotation of the indoor fan, each of the second protrusions is a first inclined surface inclined from the upstream of the second projection toward the top of the second projection in a direction away from the guide surface of the rear guider; a second inclined surface inclined from a top portion of the second projection toward a downstream side of the second projection in a direction approaching the guide surface of the rear guider; having An indoor unit for an air conditioner according to claim 1.

4. In a direction perpendicular to the rotation central axis of the indoor fan, a length of the second inclined surface is greater than a length of the first inclined surface. An indoor unit for an air conditioner according to claim 3.

5. A width of the second protrusions in a direction parallel to the rotation central axis of the indoor fan is greater than a thickness of the partition plates. An indoor unit for an air conditioner according to claim 1.

6. The width of the plurality of second projections decreases toward an apex. An indoor unit for an air conditioner according to claim 5.

7. When viewed from a direction along the central axis of rotation of the indoor fan, a distance between the plurality of second protrusions and the indoor fan is greater than a distance between the first protrusion and the indoor fan. An indoor unit for an air conditioner according to claim 1.

8. When viewed from a direction along the central axis of rotation of the indoor fan, a height of the plurality of second protrusions is greater than a height of the first protrusions. An indoor unit for an air conditioner according to claim 1.

9. In a direction perpendicular to the central axis of rotation of the indoor fan, a length of the second protrusions is greater than a length of the first protrusions. An indoor unit for an air conditioner according to claim 1.

10. An air conditioner comprising an indoor unit according to any one of claims 1 to 9 and an outdoor unit.

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