Sirocco fan unit and air conditioning device

Abstract

To suppress noise in a sirocco fan unit. [Solution] The sirocco fan unit (1) includes a sirocco fan (10) and a casing (20) that houses the fan. The casing has an inlet (22) through which a fluid (A) is drawn. The inlet is provided with a curved inlet guide (30) that extends upstream (Fa) in the fluid flow direction (F) and then toward the outer periphery (Ro) in the radial direction (R) of the inlet. A hollow silencer container (40) having a space (E) formed inside (41) is disposed radially outward of the inlet guide. The silencer container has an opening (42) that communicates with the space and faces the inner periphery (Ri) in the radial direction. The silencer container is positioned so as to overlap the inlet guide when viewed radially.

Description

[Technical Field]

[0001] The present disclosure relates to a sirocco fan unit and an air conditioning apparatus. [Background technology]

[0002] The blower disclosed in Patent Document 1 includes a fan, a casing that surrounds the fan and has a bell-mouth-shaped inlet on one side, and a bell-mouth-shaped orifice that is concentric with the inlet and has an opening with the same diameter as the inlet. The resonance space formed by the orifice resonates and silences the noise emitted from the inlet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-90767 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fan disclosed in Patent Document 1, a bell mouth is provided at the intake port. The resonance space formed by the orifice is provided only upstream of the bell mouth in the direction of fluid flow. The outer periphery of the bell mouth is dead space.

[0005] The above-mentioned layout places restrictions on increasing the size of the resonance space, which ultimately hinders the improvement of the noise reduction effect. In particular, when using a noisy sirocco fan, a structure such as that in Patent Document 1, which does not allow the resonance space to be enlarged, cannot sufficiently suppress noise.

[0006] An object of the present disclosure is to suppress noise in a sirocco fan unit. [Means for solving the problem]

[0007] A first aspect of the present disclosure is directed to a sirocco fan unit 1. The sirocco fan unit 1 includes a sirocco fan 10 and a casing 20 that houses the fan 10. The casing 20 has an inlet 22 through which a fluid A is drawn. The inlet 22 is provided with an inlet guide 30 that is curved so as to extend toward the upstream side Fa in the flow direction F of the fluid A and then toward the outer circumferential side Ro in the radial direction R of the inlet 22. ) is provided, and a hollow sound-absorbing container (40) having a space (E) formed in an interior (41) is arranged on the outer circumferential side (Ro) of the suction guide (30) in the radial direction (R), and the sound-absorbing container (40) has an opening (42) that communicates with the space (E) and faces the inner circumferential side (Ri) in the radial direction (R), and the sound-absorbing container (40) is located at a position that overlaps the suction guide (30) when viewed in the radial direction (R).

[0008] According to the first aspect, noise is likely to be generated by the rotation of the sirocco fan (10) housed in the casing (20). A sound-absorbing container (40) is disposed on the outer circumferential side (Ro) of the bell-mouth suction guide (30). The sound-absorbing container (40) functions as a Helmholtz resonator.

[0009] The opening (42) of the silencing container (40) faces the inner circumferential side (Ri), thereby effectively silencing noise generated by the fan (10). The silencing container (40) is positioned so as to overlap the suction guide (30) when viewed in the radial direction (R), thereby making it possible to increase the space (E) inside (41) of the silencing container (40), thereby improving the silencing capacity of the silencing container (40).

[0010] As described above, noise can be suppressed in the sirocco fan unit (1).

[0011] A second aspect of the present disclosure is directed to the sirocco fan unit (1) according to the first aspect. In this sirocco fan unit (1), the opening (42) is located upstream (Fa) of the suction guide (30) in the flow direction (F).

[0012] According to the second aspect, the layout of the openings (42) is easy.

[0013] A third aspect of the present disclosure is directed to the sirocco fan unit (1) according to the first or second aspect. In this sirocco fan unit (1), the silencer container (40) is provided with a curved portion (45) that curves so as to extend toward the upstream side (Fa) in the flow direction (F) and then toward the outer circumferential side (Ro) in the radial direction (R), the opening (42) is provided in the curved portion (45), and there is no step (G) between the silencer container (40) and the suction guide (30).

[0014] According to the third aspect, noise caused by sound waves striking the step (G) and resonating can be suppressed.

[0015] A fourth aspect of the present disclosure is directed to the sirocco fan unit (1) according to any one of the first to third aspects. In this sirocco fan unit (1), the silencer container (40) is provided with a curved portion (45) that curves so as to extend toward the upstream side (Fa) in the flow direction (F) and then toward the outer circumferential side (Ro) in the radial direction (R), the opening (42) is provided in the curved portion (45), and the curved portion (45) and the suction guide (30) are connected to each other so as to be continuous.

[0016] According to the fourth aspect, it is possible to prevent a step from occurring between the sound absorbing container (40) and the suction guide (30), thereby reducing noise caused by sound waves striking the step and resonating with it.

[0017] A fifth aspect of the present disclosure is directed to the sirocco fan unit (1) according to any one of the first to fourth aspects. In this sirocco fan unit (1), the silencer container (40) is provided with a curved portion (45) that curves so as to extend toward the upstream side (Fa) in the flow direction (F) and then toward the outer circumferential side (Ro) in the radial direction (R), the opening (42) is provided in the curved portion (45), and the curved portion (45) and the suction guide (30) are integral with each other so that the curved portion (45) also serves as the suction guide (30).

[0018] According to the fifth aspect, it is possible to prevent a step from occurring between the sound absorbing container (40) and the suction guide (30), thereby reducing noise caused by sound waves striking the step and resonating with it.

[0019] A sixth aspect of the present disclosure is directed to the sirocco fan unit (1) according to any one of the first to fifth aspects. In the sirocco fan unit (1), a gap (H) is formed between the suction guide (30) and the silencer container (40) in the radial direction (R).

[0020] According to the sixth aspect, the degree of freedom in the layout of the sound absorbing container (40) can be increased.

[0021] A seventh aspect of the present disclosure is directed to the sirocco fan unit (1) according to any one of the first to sixth aspects. In this sirocco fan unit (1), the openings (42) are arranged partially in the circumferential direction (T) of the suction port (22).

[0022] According to the seventh aspect, the layout of the openings (42) is facilitated.

[0023] An eighth aspect of the present disclosure is directed to the sirocco fan unit (1) according to any one of the first to seventh aspects. In this sirocco fan unit (1), the casing (20) has a tongue portion (25), and the opening (42) is provided on the tongue portion (25) side relative to a straight line (L) connecting the tongue portion (25) and an axial center (O) of the fan (10) as viewed in the axial direction (X) of the fan (10).

[0024] According to the eighth aspect, since the flow velocity of the fluid (A) is generally slower on the tongue portion (25) side of the straight line (L), the fluid (A) can be prevented from flowing into the opening (42).

[0025] A ninth aspect of the present disclosure is directed to an air conditioner (100). The air conditioner (100) includes the sirocco fan unit (1) according to any one of the first to eighth aspects.

[0026] In the ninth aspect, noise can be suppressed in the air conditioner (100). [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 shows a sirocco fan unit (1) according to a first embodiment. [Figure 2] FIG. 2 shows a fan (10) according to the first embodiment. [Figure 3] FIG. 3 shows the suction guide (30) and the sound absorbing container (40) according to the first embodiment. [Figure 4] FIG. 4 shows the positional relationship between the opening (42) and the tongue (25) of the sound-absorbing container (40) according to the first embodiment. [Figure 5] FIG. 5 shows a suction guide (30) and a sound absorbing container (40) according to the second embodiment. [Figure 6] FIG. 6 shows a suction guide (30) and a sound absorbing container (40) according to a third embodiment. [Figure 7] FIG. 7 shows a sirocco fan unit (1) according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical concept of the present disclosure. Since the drawings are intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary to facilitate understanding.

[0029] First Embodiment (Sirocco fan unit) A first embodiment will be described. FIG. 1 shows a cross-sectional view of a sirocco fan unit (1). FIG. 2 shows a perspective view of a fan (10). The sirocco fan unit (1) is applied to an air purifier (100). The air purifier (100) is an example of an air conditioner. The air purifier (100) includes the sirocco fan unit (1) and a filter (101) (see FIG. 3).

[0030] The sirocco fan unit (1) includes a fan (10), a casing (20), an inlet guide (30), and a sound-reducing container (40). In the following description, with reference to Figure 1, the front of the page is the rear, the back of the page is the front, left is the left, right is the right, top is the top, and bottom is the bottom. Figure 1 is a cross-sectional view of the sirocco fan unit (1) as seen from the rear.

[0031] The fan (10) is a sirocco fan. The direction in which the axis (O) of the fan (10) extends is called the axial direction (X). The axis (O) is the rotation axis of the fan (10). The side away from the axis (O) is called the outer circumferential side (Ro) of the radial direction (R). The side approaching the axis (O) is called the inner circumferential side (Ri) of the radial direction (R). The radial direction (R) is perpendicular to the axial direction (X). The direction of rotation around the axis (O) and the opposite direction are called the circumferential direction (T). The circumferential direction (T) is perpendicular to the axial direction (X). In the drawings, the rotation direction of the circumferential direction (T) is indicated by an arrow.

[0032] The fan (10) has a disk (11), a ring (12), and a plurality of blades (13). The disk (11) and the ring (12) are spaced apart in the axial direction (X). The disk (11) is located in the front in the axial direction (X). The ring (12) is located in the rear in the axial direction (X). The blades (13) are plate-shaped with a thickness direction in the circumferential direction (T). The blades (13) extend longitudinally in the axial direction (X) and transversely in the radial direction (R). The blades (13) connect the outer periphery of the disk (11) and the ring (12). The plurality of blades (13) are arranged side by side in the circumferential direction (T). The fan (10) is rotationally driven by, for example, an electric motor (not shown).

[0033] The casing (20) has a fan housing (21), an inlet (22), a discharge passage (23), a discharge port (24), a tongue (25), and a suction guide (30).

[0034] The fan housing portion (21) of the casing (20) houses the fan (10). The fan (10) is confined within the casing (20). In the fan housing portion (21), the fan (10) extends in the axial direction (X) and rotates counterclockwise in the circumferential direction (T) (as viewed from the rear).

[0035] The suction port (22) is provided in the rear wall portion (21a) of the fan housing portion (21) of the casing (20). The suction port (22) penetrates the rear wall portion (21a) in the axial direction (X). The suction port (22) has a circular shape when viewed in the axial direction (X). The axis (O) of the suction port (22) and the axis (O) of the fan (10) coincide with each other. The inner diameter of the suction port (22) is smaller than the outer diameter of the fan (10). Air (A) is drawn into the suction port (22).

[0036] The discharge passage (23) is disposed to the right and above the outer circumferential side (Ro) of the fan housing portion (21) (fan (10)). The discharge passage (23) extends vertically. Specifically, the discharge passage (23) extends obliquely, gradually moving slightly leftward as it extends upward. An outlet (24) is provided at the upper end of the discharge passage (23). Air (A) is discharged from the outlet (24).

[0037] The tongue portion (25) is provided in the casing (20) between the fan housing portion (21) and the discharge passage (23). The tongue portion (25) is disposed between the upper right end of the fan housing portion (21) and the lower end of the left wall portion of the discharge passage (23). The tongue portion (25) has a tongue-like shape that protrudes diagonally downward to the right. The tongue portion (25) is located between the fan housing portion (21) and the discharge passage (23) and serves as the start of the spiral of a spiral volute. The tongue portion (25) is disposed on the upper right side of the outer circumferential side (Ro) with respect to the axis (O) of the fan (10) (the inlet (22)).

[0038] As will be described in detail later, the suction guide (30) is provided at the suction port (22). As will be described in detail later, the silencer container (40) is disposed on the outer circumferential side (Ro) of the suction guide (30) (indicated by a two-dot chain line in FIG. 1).

[0039] (Air flow) The flow of air (A) in the sirocco fan unit (1) will be described. FIG. 3 shows a cross-sectional view of the suction guide (30) and the silencer container (40) taken along line III. Air (A) is an example of a fluid. In the following description, the direction in which air (A) flows will be referred to as flow direction (F). The upstream side of the flow direction (F) will sometimes be simply referred to as upstream side (Fa). The downstream side of the flow direction (F) will sometimes be simply referred to as downstream side (Fb).

[0040] Air (A) is sucked into the casing (20) from outside the casing (20) through the suction port (22). The air (A) sucked through the suction port (22) flows from rear to front in the axial direction (X) and enters the fan housing section (21). At the suction port (22), the upstream side (Fa) of the flow direction (F) is the rear side in the axial direction (X). At the suction port (22), the downstream side (Fb) of the flow direction (F) is the front side in the axial direction (X).

[0041] In the fan housing portion (21), the flow direction (F) of the air (A) is changed by the fan (10) so that the air (A) flows from below to above and enters the discharge passage (23). The flow of the air (A) becomes swirling at the tongue portion (25) between the fan housing portion (21) (fan (10)) and the discharge passage (23).

[0042] The air (A) flows from bottom to top through the discharge passage (23) and is discharged to the outside of the casing (20) through the discharge port (24).

[0043] (Suction guide) As shown in Fig. 3, the suction port (22) is provided with a suction guide (30). The suction guide (30) is provided on the edge of the opening of the suction port (22).

[0044] The suction guide (30) has a bell-mouth shape. The suction guide (30) extends toward the outer periphery (Ro) in the radial direction (R) as it extends rearward in the axial direction (X). The suction guide (30) is curved so as to extend toward the outer periphery (Ro) in the radial direction (R) of the suction port (22) as it extends upstream (Fa) in the flow direction (F) of the air (A).

[0045] The suction guide (30) is provided in an annular shape around the suction port (22) over the entire circumference in the circumferential direction (T) (see FIG. 1).

[0046] (Sound-absorbing container) 3, a sound absorbing container (40) is arranged on the outer circumferential side (Ro) of the suction guide (30) in the radial direction (R). The sound absorbing container (40) is arranged on the rear wall (21a) of the fan housing section (21) of the casing (20).

[0047] The sound-absorbing container (40) functions as a Helmholtz resonator. In a Helmholtz resonator, the air inside a hollow container with an opening acts as a spring and resonates. This air resonance absorbs sound energy, thereby silencing the sound.

[0048] The silencer container (40) has a generally rectangular frame shape in a cross section perpendicular to the circumferential direction (T) (the cross section in FIG. 3). The silencer container (40) is annularly provided around the outer periphery (Ro) of the suction guide (30) in the circumferential direction (T) (see FIG. 1).

[0049] The sound absorbing container (40) includes a first wall (40a), a second wall (40b), a third wall (40c), and a fourth wall (40d). The first wall (40a) is located on the upstream side (Fa) (rear). The second wall (40b) is located on the downstream side (Fb) (front). The third wall (40c) is located on the outer circumferential side (Ro). The fourth wall (40d) is located on the inner circumferential side (Ri).

[0050] The sound absorbing container (40) is hollow. A space (E) is formed in the interior (41) of the sound absorbing container (40). The interior (41) is an area surrounded by a first wall (40a), a second wall (40b), a third wall (40c), and a fourth wall (40d). Air is contained in the space (E).

[0051] The sound absorbing container (40) has an opening (42). The opening (42) is provided in the fourth wall (40d). The opening (42) faces the inner circumferential side (Ri) in the radial direction (R). More specifically, the opening (42) faces straight toward the inner circumferential side (Ri). The opening (42) communicates with the space (E) inside (41) of the sound absorbing container (40).

[0052] When viewed in the radial direction (R), the silencer container (40) is positioned so as to overlap the suction guide (30). In other words, in the flow direction (F), the downstream end (43) on the downstream side (Fb) of the silencer container (40) is positioned downstream (Fb) of the upstream end (31) on the upstream side (Fa) of the suction guide (30).

[0053] The downstream end (43) of the silencer container (40) is located at the second wall (40b). The upstream end (31) of the suction guide (30) is connected to the fourth wall (40d) of the silencer container (40). The connection point between the upstream end (31) and the fourth wall (40d) is located at the center (44) of the fourth wall (40d) in the flow direction (F).

[0054] The opening (42) is located upstream (Fa) of the central portion (44) of the fourth wall (40d) of the silencer container (40) in the flow direction (F). The opening (42) is located upstream (Fa) of the suction guide (30) in the flow direction (F).

[0055] A step (G) exists between the silencing container (40) and the suction guide (30). The step (G) is formed between the fourth wall (40d) of the silencing container (40) and the upstream end (31) of the suction guide (30). The step (G) is formed at a right angle by the fourth wall (40d) extending in the axial direction (X) (flow direction (F)) and the upstream end (31) extending in the radial direction (R).

[0056] A gap (H) is formed between the suction guide (30) and the silencer container (40) in the radial direction (R). The gap (H) is formed between the fourth wall (40d) of the silencer container (40) and the suction guide (30). The gap (H) communicates with the fan housing portion (21) of the casing (20).

[0057] (Positional relationship between the opening of the silencer container and the tongue) 4 shows the positional relationship between the opening (42) of the silencer container (40) and the tongue portion (25) as viewed from the rear. As described above, the silencer container (40) is annularly provided around the entire circumference (Ro) of the suction guide (30) in the circumferential direction (T). The opening (42) is partially disposed in the circumferential direction (T) of the suction port (22). The opening (42) is provided only in a portion of the silencer container (40) in the circumferential direction (T). The multiple openings (42) are arranged side by side at intervals in the circumferential direction (T).

[0058] The opening (42) is provided on the tongue portion (25) side of a straight line (L) connecting (the tip of) the tongue portion (25) and the axis (O) of the fan (10) when viewed in the axial direction (X) of the fan (10). The opening (42) is not provided on the opposite side of the straight line (L) connecting the tongue portion (25) and the axis (O) from the tongue portion (25) when viewed in the axial direction (X).

[0059] (Action and effect) The rotation of the sirocco fan (10) housed in the casing (20) is likely to generate noise. A noise-absorbing container (40) is disposed on the outer circumferential side (Ro) of the bell-mouth suction guide (30). The noise-absorbing container (40) functions as a Helmholtz resonator.

[0060] The opening (42) of the silencing container (40) faces the inner circumferential side (Ri), thereby effectively silencing noise generated by the fan (10). The silencing container (40) is positioned so as to overlap the suction guide (30) when viewed in the radial direction (R), thereby making it possible to increase the space (E) inside (41) of the silencing container (40), thereby improving the silencing capacity of the silencing container (40).

[0061] As described above, noise can be suppressed in the sirocco fan unit (1).

[0062] The opening (42) is disposed upstream (Fa) of the suction guide (30) in the flow direction (F), which facilitates the layout of the opening (42).

[0063] A gap (H) is formed between the suction guide (30) and the silencer container (40) in the radial direction (R), which increases the degree of freedom in the layout of the silencer container (40).

[0064] The openings (42) are arranged partially in the circumferential direction (T), which makes it easier to lay out the openings (42).

[0065] The openings (42) are provided only partially in the circumferential direction (T) of the sound absorbing container (40), which makes it easy to layout the openings (42).

[0066] The openings (42) are provided on the tongue portion (25) side of a straight line (L) connecting the tongue portion (25) and the axial center (O) of the fan (10) when viewed in the axial direction (X) of the fan (10). The flow velocity of the air (A) is generally slower on the tongue portion (25) side of the straight line (L) (compared to the side opposite the tongue portion (25) from the straight line (L)), so that the air (A) can be prevented from flowing into the openings (42).

[0067] The air purifying device (100) includes a sirocco fan unit (1), which can suppress noise in the air purifying device (100).

[0068] Second Embodiment A second embodiment will be described. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted. Figure 5 shows the suction guide (30) and the sound absorbing container (40).

[0069] The sound absorbing container (40) is provided with a curved portion (45). The curved portion (45) is formed at a connection between the first wall (40a) and the fourth wall (40d). The curved portion (45) has an arc shape that is convex toward the upstream side (Fa) and the inner peripheral side (Ri). The curved portion (45) is curved so as to extend toward the outer peripheral side (Ro) in the radial direction (R) as it extends toward the upstream side (Fa) in the flow direction (F).

[0070] The upstream end (31) of the suction guide (30) is connected to the curved portion (45) of the silencing container (40). The radius of curvature of the suction guide (30) and the radius of curvature of the curved portion (45) are approximately equal. The curved portion (45) and the suction guide (30) are connected to each other so as to be continuous. The curved portion (45) and the suction guide (30) are connected smoothly. There is no step (G) (see Figure 3) between the silencing container (40) and the suction guide (30). When viewed in the radial direction (R), the silencing container (40) is located so as to overlap the suction guide (30).

[0071] The opening (42) is provided in the curved portion (45). The opening (42) faces the upstream side (Fa) and the inner peripheral side (Ri).

[0072] A gap (H) is formed between the suction guide (30) and the silencer container (40) in the radial direction (R). The gap (H) is formed between the fourth wall (40d) of the silencer container (40) and the suction guide (30). The gap (H) communicates with the fan housing portion (21) of the casing (20).

[0073] The other configurations are the same as those in the first embodiment.

[0074] This can prevent the generation of a step (G) (see FIG. 3) between the sound-absorbing container (40) and the suction guide (30). This can also prevent the noise (see FIG. 3) caused by the sound waves (P) striking the step (G) and resonating.

[0075] The sound waves (P) include incident sound that travels from inside the casing (20) toward the upstream side (Fa) and out of the casing (20) through the suction port (22), and reflected sound that travels from outside the casing (20) toward the downstream side (Fb) and into the casing (20) through the suction port (22) (reflected sound is shown in Figure 3).

[0076] <Third embodiment> A third embodiment will be described. In the following description, the same components as those in the above-described embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted. Figure 6 shows the suction guide (30) and the sound absorbing container (40).

[0077] The sound absorbing container (40) is provided with a curved portion (45). The curved portion (45) is formed at a connection between the first wall (40a) and the fourth wall (40d). The curved portion (45) has an arc shape that is convex toward the upstream side (Fa) and the inner peripheral side (Ri). The curved portion (45) is curved so as to extend toward the outer peripheral side (Ro) in the radial direction (R) as it extends toward the upstream side (Fa) in the flow direction (F).

[0078] The curved portion (45) and the suction guide (30) are integral with each other so that the curved portion (45) also serves as the suction guide (30). There is no step (G) (see FIG. 3) between the silencing container (40) and the suction guide (30). When viewed in the radial direction (R), the silencing container (40) is positioned so as to overlap the suction guide (30).

[0079] The opening (42) is provided in the curved portion (45). The opening (42) faces the upstream side (Fa) and the inner peripheral side (Ri).

[0080] There is no gap (H) (see FIGS. 3 and 5) between the suction guide (30) and the silencing container (40) in the radial direction (R). There may also be no gap between the silencing container (40) and the rear wall portion (21 a) of the casing (20).

[0081] The other configurations are the same as those in the second embodiment.

[0082] This can prevent the generation of a step (G) (see FIG. 3) between the sound absorbing container (40) and the suction guide (30). This can prevent the noise (see FIG. 3) caused by sound waves (P) striking the step (G) and resonating. By integrating the sound absorbing container (40) and the suction guide (30), the space (E) inside (41) of the sound absorbing container (40) can be increased.

[0083] <Fourth embodiment> A fourth embodiment will be described. In the following description, the same components as those in the above-described embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. Figure 7 shows a sirocco fan unit (1).

[0084] The sirocco fan unit (1) includes an auxiliary guide (50). The auxiliary guide (50) has a bell-mouth shape. The auxiliary guide (50) is curved so as to extend toward the upstream side (Fa) in the flow direction (F) and toward the outer periphery (Ro) in the radial direction (R).

[0085] The auxiliary guide (50) is disposed upstream (Fa) of the suction port (22). The auxiliary guide (50) has an opening (51). The axis (O) of the opening (51) of the auxiliary guide (50) coincides with the axis (O) of the suction port (22). The diameter of the opening (51) of the auxiliary guide (50) and the diameter of the suction port (22) are approximately equal.

[0086] The silencer container (40) is disposed radially outward (Ro) of the suction guide (30) and the auxiliary guide (50). The silencer container (40) is formed by combining the casing (20), the suction guide (30), the auxiliary guide (50), and the like.

[0087] The silencer container (40) is hollow. A space (E) is formed in the interior (41) of the silencer container (40). The space (E) includes a first space (E1) and a second space (E2). The first space (E1) is defined by the auxiliary guide (50) and the rear surface of the rear wall portion (21a) of the casing (20). The rear wall portion (21a) of the casing (20) is formed with a recess (26) recessed toward the downstream side (Fb). The second space (E2) is defined by the recess (26) and the suction guide (30).

[0088] The sound absorbing container (40) has an opening (42) that faces the inner periphery (Ri) in the radial direction (R). The opening (42) communicates with the space (E).

[0089] When viewed in the radial direction (R), the silencer container (40) is positioned so as to overlap the suction guide (30) and the auxiliary guide (50). In the flow direction (F), the downstream end (43) of the silencer container (40) (the bottom surface of the recess (26)) is positioned downstream (Fb) of the upstream end (31) of the suction guide (30).

[0090] The opening (42) is located upstream (Fa) of the upstream end (31) of the suction guide (30) in the flow direction (F). The opening (42) is located downstream (Fb) of the downstream end (52) of the auxiliary guide (50) in the flow direction (F). The opening (42) is located between the upstream end (31) of the suction guide (30) and the downstream end (52) of the auxiliary guide (50) in the flow direction (F).

[0091] The other configurations are the same as those in the first embodiment.

[0092] <Other embodiments> The openings 42 may be arranged all around in the circumferential direction T. In this case, by making the number of openings 42 on the tongue portion 25 side of the straight line L greater than the number of openings 42 on the opposite side of the straight line L from the tongue portion 25, it is possible to prevent the air A from flowing into the openings 42.

[0093] In the above embodiment, the sound absorbing container (40) is provided in an annular shape over the entire circumference in the circumferential direction (T), but is not limited thereto. The sound absorbing container (40) may be disposed only over a portion of the circumference in the circumferential direction (T) rather than over the entire circumference in the circumferential direction (T).

[0094] The fluid (A) is not limited to air.

[0095] The sirocco fan unit (1) may be applied to, for example, a refrigerant type or other type air conditioner (100), etc. The sirocco fan unit (1) may be used alone.

[0096] Although the embodiments have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. Elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate.

[0097] The terms "first," "second," "third," etc. mentioned above are used to distinguish the terms to which these terms are attached, and do not limit the number or order of the terms. [Explanation of symbols]

[0098] O axis center X-axis direction R Radial direction Ro outer periphery Ri inner side T circumferential direction F Flow direction Fa Upstream Fb downstream side A Air (fluid) E space G Step H gap L straight line 1 Sirocco fan unit 10 Fans 20 Casing 22 Intake port 25 Tongue 30 Suction guide 40 Sound-absorbing container 41 Inside 42 Aperture 45 curved section 100 Air purifier (air conditioner)

Claims

1. Sirocco fan (10) and a casing (20) that houses the fan (10), The casing (20) has a suction port (22) through which a fluid (A) is sucked, The suction port (22) is provided with a suction guide (30) that is curved so as to extend toward an upstream side (Fa) in a flow direction (F) of a fluid (A) and then toward an outer circumferential side (Ro) in a radial direction (R) of the suction port (22), a hollow silencer container (40) having a space (E) formed inside (41) is disposed on the outer periphery side (Ro) of the suction guide (30) in the radial direction (R); The silencer container (40) is provided with an opening (42) that communicates with the space (E) and faces an inner circumferential side (Ri) in the radial direction (R), The silencer container (40) is located at a position overlapping the suction guide (30) when viewed in the radial direction (R), The silencer container (40) is provided with a curved portion (45) that is curved so as to extend toward the upstream side (Fa) in the flow direction (F) and then toward the outer circumferential side (Ro) in the radial direction (R), The opening (42) is provided in the curved portion (45).

2. The sirocco fan unit according to claim 1, wherein the opening (42) is arranged on the upstream side (Fa) of the suction guide (30) in the flow direction (F).

3. A centrifugal fan unit as described in claim 1 or 2, wherein there is no step (G) between the silencer container (40) and the suction guide (30).

4. A centrifugal fan unit as described in claim 1 or 2, wherein the curved portion (45) and the suction guide (30) are connected to each other so as to be continuous.

5. A centrifugal fan unit as described in claim 1, wherein the curved portion (45) and the suction guide (30) are integral with each other so that the curved portion (45) also serves as the suction guide (30).

6. The sirocco fan unit according to claim 1 or 2, wherein a gap (H) is formed between the suction guide (30) and the silencer container (40) in the radial direction (R).

7. The sirocco fan unit according to claim 1 or 2, wherein the openings (42) are arranged partially in a circumferential direction (T) of the suction port (22).

8. The casing (20) has a tongue portion (25), 3. The sirocco fan unit according to claim 1, wherein the opening (42) is provided on the tongue portion (25) side of a straight line (L) connecting the tongue portion (25) and an axis (O) of the fan (10) when viewed in the axial direction (X) of the fan (10).

9. An air conditioner comprising the sirocco fan unit (1) according to claim 1 or 2.

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