Air treatment device

Abstract

To provide an air treatment device that can enhance air treatment performance while reducing noise caused by operation sound of a fan.SOLUTION: An air treatment device according to an embodiment comprises a case, a fan, an air treatment unit, and a resonance generation part. In the case, an introduction port and a discharge port are each formed as an opening part to the outside. The fan and the resonance generation part are arranged inside the case. The fan is operated, and thereby a flow of air from the introduction port toward the discharge port is formed inside the case. The air treatment unit performs air treatment for the air flowing from the introduction port to the discharge port, inside the case. The resonance generation part cancels sound in a specific frequency range corresponding to operation sound of the fan by generating resonance so as to make it correspond to incidence of sound waves.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] FIELD OF THE INVENTION An embodiment of the present invention relates to an air treatment device. [Background technology]

[0002] Air treatment devices are known that introduce air into a housing and perform sterilization or the like on the introduced air. In such air treatment devices, outside air is introduced into the housing through an inlet. The introduced air is then treated using either ultraviolet light emitted from an ultraviolet light source or ozone generated inside the housing. The treated air is then discharged to the outside of the housing through an outlet. In the air treatment device, a fan is disposed inside the housing, and by operating the fan, an air flow is formed inside the housing from the inlet to the outlet.

[0003] In the air treatment device described above, increasing the output of the fan increases the air flow rate inside the housing, improving air treatment performance. However, increasing the output of the fan increases the operating noise of the fan, which increases the noise caused by the operating noise of the fan. For this reason, there is a demand for air treatment devices that improve air treatment performance while reducing the noise caused by the operating noise of the fan. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-33293 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to provide an air treatment device that can improve air treatment performance while reducing noise caused by the operating sound of a fan. [Means for solving the problem]

[0006] According to an embodiment, the air treatment device includes a housing, a fan, an air treatment unit, and a resonance generating section. The housing has an inlet and an outlet formed as openings to the outside. The fan is disposed inside the housing, and when the fan is operated, an air flow is formed inside the housing from the inlet to the outlet. The air treatment unit performs air treatment on the air flowing from the inlet to the outlet inside the housing. The resonance generating section is disposed inside the housing, and generates resonance in response to the incidence of sound waves, thereby canceling out sound in a specific frequency range corresponding to the operating sound of the fan. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an air treatment device that can improve air treatment performance while reducing noise caused by the operating sound of a fan. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an example of an air treatment device according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing an example of the internal configuration of the housing of the air treatment device according to the embodiment. [Figure 3] FIG. 3 is a plan view showing an example of the internal configuration of the housing of the air processing device according to the embodiment, as viewed from one side in the depth direction (the front side). [Figure 4] FIG. 4 is a perspective view showing the configuration of an assembly (first assembly) in the embodiment. [Figure 5] FIG. 5 is a perspective view showing an assembly (first assembly) in an embodiment, with the fan and the resonance generating section (second resonance generating section) omitted. [Figure 6] FIG. 6 is a perspective view showing an assembly (first assembly) in an embodiment, with the fan, the resonance generating unit (second resonance generating unit), and the installation frame omitted. [Figure 7]FIG. 7 is a perspective view showing an assembly (first assembly) in the embodiment, cut along a cross section passing through the light blocking member and perpendicular or substantially perpendicular to the height direction. [Figure 8] FIG. 8 is an enlarged perspective view of a part of FIG. [Figure 9] FIG. 9 is a perspective view showing the configuration of a light blocking member of an assembly (first assembly) in the embodiment. [Figure 10] FIG. 10 is a perspective view showing the configuration of one fan, a resonance generating section attached to the fan, and their vicinity in an assembly (first assembly) according to the embodiment. [Figure 11] FIG. 11 is a perspective view showing one fan, a resonance generating unit attached to the fan, and the surrounding configuration in an assembly (first assembly) according to an embodiment, cut at a cross section passing through the attachment member of the resonance generating unit and perpendicular or approximately perpendicular to the axial direction of the fan. [Figure 12] FIG. 12 is a perspective view showing one fan, a resonance generating section attached to the fan, and the surrounding area thereof, with attachment members omitted, in an assembly (first assembly) according to the embodiment. [Figure 13] FIG. 13 is a perspective view showing an arbitrary configuration of an attachment member in the resonance generating section (second resonance generating section) according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The air treatment device (1) of this embodiment includes a housing (2), a fan (20), air treatment units (21, 22), and resonance generating sections (27, 28). The housing (2) is formed with inlets (15; 13) and outlets (13; 15) as openings to the outside. The fan (20) is disposed inside the housing (2), and when the fan (20) is operated, an air flow is formed inside the housing (2) from the inlets (15; 13) to the outlets (13; 15). The air treatment units (21, 22) perform air treatment on the air flowing from the inlets (15; 13) to the outlets (13; 15) inside the housing (2). The resonance generating sections (27, 28) are disposed inside the housing (2) and generate resonance in response to incident sound waves, thereby canceling out sounds in a specific frequency range corresponding to the operating noise of the fan (20). This makes it possible to reduce noise caused by the operation of the fan (20) while increasing the output of the fan (20), thereby improving the performance of air treatment.

[0010] In the air treatment device (1) of this embodiment, the air treatment unit (21, 22) includes an ultraviolet light source (21) that emits ultraviolet light within the housing (2), and performs air treatment using the ultraviolet light emitted from the ultraviolet light source (21). The air treatment device (1) further includes a light-shielding member (26) that blocks the ultraviolet light emitted from the ultraviolet light source (21) within the housing (2). Air flowing from the inlet (15; 13) to the outlet (13; 15) passes through the light-shielding member (26), and the resonance generating unit (27) is disposed in a region within the housing (2) where the air passes through the light-shielding member (26). This effectively utilizes the region where the light-shielding member (26), a necessary component for air treatment using ultraviolet light, is disposed, thereby reducing noise caused by the operating sound of the fan (20).

[0011] In the air treatment device (1) of this embodiment, the light blocking member (26) branches the air flow path into a plurality of mutually independent air flow paths (36A, 36B) in the region where the air passes through the light blocking member (26). The resonance generating unit (27) includes a plurality of resonance generators (42), and one or more of the plurality of resonance generators (42) are arranged in each of the plurality of air flow paths (36A, 36B). This allows the resonance generators (42) to further appropriately reduce the operating noise of the fan (20) in the region where the air passes through the light blocking member (26).

[0012] In the air treatment device (1) of this embodiment, the light blocking member (26) includes a pair of light blocking plates (35) arranged along the width direction of the light blocking member (26), with an air flow path (36A; 36B) through which air passes formed between them, and relay plates (41A; 41B) connecting the pair of light blocking plates (35). The relay plates (41A; 41B) cover the air flow path (36A; 36B) between the pair of light blocking plates (35) from one side in the depth direction of the light blocking member (26), which intersects with the width direction of the light blocking member (26). The resonance generating unit (27) includes a resonance generator (42) arranged in the air flow path (36A; 36B) between the pair of light blocking plates (35), and the resonance generator (42) includes a body portion (45) and a neck tube portion (43). The body portion (45) is connected to the relay plate portions (41A, 41B) of the light blocking member (26) and protrudes from the relay plate portions (41A, 41B) toward the air flow paths (36A, 36B). The neck tube portion (43) protrudes from the body portion (45) on the side opposite to the relay plate portions (41A, 41B) and connects the interior of the body portion (45) to the air flow paths (36A, 36B). With this configuration, a resonance generator (42) is appropriately formed in the region where air passes through the light blocking member (26).

[0013] In the air treatment device (1) of this embodiment, the body portion (45) and neck tube portion (43) of the resonance generator (42) form part of the light blocking member (26) and are integrally formed with the pair of light blocking plate portions (35) and relay plate portions (41A, 41B) in the light blocking member (26). This allows the body portion (45) and neck tube portion (43) of the resonance generator (42) to be formed integrally with the light blocking member (26) by injection molding or the like, thereby reducing the effort required to manufacture the resonance generator (42).

[0014] In the air treatment device (1) of this embodiment, the fan (20) includes a fan frame (51) and a fan rotating section (52), and the fan rotating section (52) is attached to the fan frame (51) so as to be rotatable in the circumferential direction of the fan (20). The resonance generating section (28) is attached to the fan frame (51) so as to be adjacent to the fan (20) from one axial side of the fan (20). This allows the resonance generating section (28) to be disposed near the fan (20) inside the housing (2), thereby further appropriately reducing noise caused by the operating sound of the fan (20).

[0015] In the air treatment device (1) of this embodiment, the resonance generating section (28) includes a base plate (60), a body portion (73), and a neck tube portion (75). The base plate (60) is attached to the fan frame (51). The body portion (73) is attached to the base plate (60) on the side opposite the fan (20) in the axial direction of the fan (20) and cooperates with the base plate (60) to enclose a cavity. The neck tube portion (75) protrudes from the body portion (73) toward the outer periphery of the fan (20) and connects the cavity enclosed by the body portion (73) and base plate (60) to the outside. This configuration appropriately forms a resonance generator (71) adjacent to the fan (20) in the axial direction.

[0016] In the air treatment device (1) of this embodiment, the resonance generating unit (28) has a plurality of body portions (73) arranged on the base plate (60) in a circumferential direction of the fan (20), and each of the body portions (73) defines a cavity, thereby forming a plurality of cavities isolated from one another by the body portions (73). The resonance generating unit (28) has a plurality of neck tube portions (75) provided corresponding to each of the body portions (73), thereby providing a plurality of neck tube portions (75). Each of the neck tube portions (75) protrudes from a corresponding one of the body portions (73) toward the outer periphery of the fan (20) and connects the cavity surrounded by the corresponding one of the body portions (73) and the base plate (60) to the outside. With this configuration, sound waves can be incident on the multiple resonance generators (71) from different angular positions relative to each other in the circumferential direction of the fan (20), thereby further appropriately reducing the operating noise of the fan (20).

[0017] In the air treatment device (1) of this embodiment, the body portion (73) of the resonance generating unit (28) includes an inclined plate portion (87) that is inclined with respect to the axial direction of the fan (20). The inclined plate portion (87) covers the cavity surrounded by the body portion (73) and the base plate portion (60) from the outer periphery of the fan (20), and is inclined so that the farther away from the fan (20) it is from the axial direction of the fan (20), the closer it is to the inner periphery of the fan (20). This suppresses turbulence in the air flow caused by the resonance generating unit (28), even if the resonance generating unit (28) is provided adjacent to the fan (20) in the axial direction.

[0018] Hereinafter, embodiments will be described with reference to the drawings.

[0019] FIG. 1 is a perspective view showing an example of an air processing device 1 according to an embodiment. As shown in FIG. 1, the air processing device 1 includes a housing 2 and leg members 3. The air processing device 1 and housing 2 have a depth direction (the direction indicated by arrows X1 and X2), a width direction (the direction indicated by arrows Y1 and Y2) that intersects (is perpendicular or substantially perpendicular to) the depth direction, and a height direction (the direction indicated by arrows Z1 and Z2) that intersects (is perpendicular or substantially perpendicular to) both the depth direction and the width direction. Furthermore, in the air processing device 1 and housing 2, one side in the depth direction is the front side (the arrow X1 side), and the side opposite the front side in the depth direction is the rear side (the arrow X2 side). Furthermore, in the air processing device 1 and housing 2, one side in the height direction is the upper side (the arrow Z1 side), and the side opposite the upper side in the height direction is the lower side (the arrow Z2 side).

[0020] The leg members 3 are removably attached to the housing 2 from below in the height direction. The leg members 3 are attached to the housing 2 with a gap formed between them. In one example, the air treatment device 1 is used with the leg members 3 in contact with an installation surface such as a floor. In this case, the air treatment device 1 is used with, for example, the upper side in the height direction aligned or approximately aligned with the vertical upper side. The air treatment device 1 may also be used with the leg members 3 detached from the housing 2. In this case, the air treatment device 1 is used with the housing 2 attached to, for example, a wall surface of a room.

[0021] 2 and 3 show an example of the internal configuration of the housing 2 of the air treatment device 1 according to the embodiment. FIG. 2 shows a perspective view, and FIG. 3 shows a plan view as viewed from one side (front side) in the depth direction. As shown in FIGS. 1 to 3, the housing 2 includes a front wall 5, a rear wall 6, a top wall 7, a bottom wall 8, and a pair of side walls 11 and 12. An internal cavity is formed inside the housing 2, and the internal cavity is surrounded by the front wall 5, the rear wall 6, the top wall 7, the bottom wall 8, and the side walls 11 and 12. The front wall 5 covers the internal cavity from the front side, and the rear wall 6 covers the internal cavity from the rear side. The front wall 5 and the rear wall 6 are spaced apart from each other in the depth direction, sandwiching the internal cavity therebetween.

[0022] The top wall 7 covers the internal cavity from above, and the bottom wall 8 covers the internal cavity from below. The top wall 7 and the bottom wall 8 are arranged spaced apart in the height direction, with the internal cavity sandwiched between them. The side wall 11 covers the internal cavity from one side in the width direction, and the side wall 12 covers the internal cavity from the opposite side to the side wall 11 in the width direction. The side walls 11 and 12 are arranged spaced apart in the width direction, with the internal cavity sandwiched between them.

[0023] In the housing 2, an opening (first opening) 13 is formed in the top wall 7, and an opening (second opening) 15 is formed in the bottom wall 8. The internal cavity opens to the outside of the housing 2 at each of the openings 13 and 15. The internal cavity opens upward in the height direction at opening 13, and opens downward in the height direction at opening 15. When the leg member 3 is attached to the housing 2, the opening 15 opens toward the gap between the housing 2 and the leg member 3.

[0024] As shown in FIGS. 2 and 3 , two assemblies 16 and 17 are disposed in the internal cavity of the housing 2. The assembly (first assembly) 16 is adjacent to the top wall 7 from its lower side in the height direction and faces the opening 13 from its lower side in the height direction. The assembly (second assembly) 17 is adjacent to the bottom wall 8 from its upper side in the height direction and faces the opening 15 from its upper side in the height direction. In the internal cavity of the housing 2, the assemblies 16 and 17 are disposed apart from each other in the height direction. In the internal cavity, a processing space 18 is formed between the assemblies 16 and 17 in the height direction. In the example shown in FIGS. 2 and 3 , the dimension of the processing space 18 in the height direction of the housing 2 is more than half the dimension of the housing 2 in the height direction. Therefore, the distance between the assemblies 16 and 17 in the height direction of the housing 2 is more than half the distance between the top wall 7 and the bottom wall 8 in the height direction of the housing 2. Therefore, the processing space 18 is formed as a relatively wide space portion inside the housing 2.

[0025] As shown in FIG. 3 and other figures, the assembly 16 includes fans 20. In the example shown in FIG. 3, two fans 20 are disposed between the processing space 18 and the opening 13, and the two fans 20 are disposed side by side in the width direction of the housing 2. Each of the fans 20 may be, for example, an axial fan, a centrifugal fan, or a sirocco fan. Each of the fans 20 is operated by supplying power. When the fans 20 are operated, an air flow is formed in the internal cavity of the housing 2, from one of the openings 13, 15 to the other of the openings 13, 15. In the example shown in FIG. 3, when the fans 20 are operated, an air flow is formed inside the housing 2 along the height direction of the housing 2.

[0026] In one example, an exhaust fan is used as the fan 20. In this case, when the fan 20 is operated, air flows in the internal cavity of the housing 2 from the opening 15 to the opening 13, passing through the assembly 17, the processing space 18, and the assembly 16 in this order. In this case, the opening 15 serves as an inlet for introducing air from the outside into the inside of the housing 2, and the opening 13 serves as an outlet for discharging air from the inside of the housing 2 to the outside. In another example, an intake fan is used as the fan 20. In this case, when the fan 20 is operated, air flows in the internal cavity of the housing 2 from the opening 13 to the opening 15, passing through the assembly 16, the processing space 18, and the assembly 17 in this order. In this case, the opening 13 serves as an inlet for introducing air from the outside into the inside of the housing 2, and the opening 15 serves as an outlet for discharging air from the inside of the housing 2 to the outside.

[0027] In either the configuration in which the opening 13 serves as an exhaust port or the configuration in which the opening 13 serves as an inlet port, a processing space 18 is formed between the inlet port and the exhaust port inside the housing. A fan 20 is disposed between the processing space 18 and the exhaust port or the inlet port.

[0028] An air treatment unit is disposed in the internal cavity of the housing 2. In the air treatment device 1, the air treatment unit treats the air flowing inside the housing 2 from the inlet toward the outlet. In the example shown in FIGS. 2 and 3 , an ultraviolet light source 21 and a photocatalyst module 22 are provided as the air treatment unit. The ultraviolet light source 21 is provided in the assembly 16, and the photocatalyst module 22 is provided in the assembly 17. In the assembly 16, the ultraviolet light source 21 is disposed on the side of the fan 20 where the treatment space 18 is located. Therefore, the ultraviolet light source 21 is disposed at a position farther from the opening 13 than the fan 20. In addition, in the example shown in FIGS. 2 and 3 , the photocatalyst module 22 is provided in the assembly 17. Inside the housing 2, the treatment space 18 is disposed between the ultraviolet light source 21 and the photocatalyst module 22 in the height direction, and the ultraviolet light source 21 faces the photocatalyst module 22 with the treatment space 18 sandwiched therebetween.

[0029] The ultraviolet light source 21 emits ultraviolet light toward the processing space 18, and in the example shown in FIGS. 2 and 3, the ultraviolet light is emitted downward in the height direction. The ultraviolet light source 21 includes one or more light-emitting elements 23, and in the example shown in FIGS. 2 and 3, the ultraviolet light source 21 is provided with a plurality of light-emitting elements 23. The light-emitting elements 23 are, for example, ultraviolet LEDs. Alternatively, the ultraviolet light source 21 may be replaced with lamps other than LEDs, such as a mercury lamp, a metal halide lamp, a fluorescent ultraviolet lamp, or an excimer lamp. When the ultraviolet light source 21 is operated by a supply of power or the like, it irradiates ultraviolet light emitted by the light-emitting elements 23 into the processing space 18.

[0030] 2 and 3, air treatment is performed using ultraviolet light emitted from ultraviolet light source 21. Ultraviolet light source 21 irradiates treatment space 18 with ultraviolet light having a peak wavelength in the range of 200 nm or more and 320 nm or less, i.e., UV-C. In treatment space 18, UV-C is irradiated onto the air from ultraviolet light source 21, thereby suppressing the activity of viruses, fungi (bacteria), and the like contained in the air flowing through treatment space 18. This sterilizes the air in treatment space 18.

[0031] In the photocatalyst module 22, a photocatalyst is supported on the surface of a base material. In the photocatalyst module 22, a plurality (countless) of through holes are formed in the base material, and the base material is made of ceramics such as aluminum oxide and aluminum nitride. The photocatalyst supported on the base material is made of metal oxides such as titanium oxide and tungsten oxide.

[0032] 2 and 3, the ultraviolet light source 21 irradiates the treatment space 18 with ultraviolet light having a peak wavelength in the range of 320 nm or more and 400 nm or less, i.e., UV-A, in addition to the aforementioned UV-C. At least a portion of the ultraviolet light emitted from the ultraviolet light source 21 is incident on the photocatalyst module 22 directly and / or after reflection. When UV-A is incident on the photocatalyst module 22, active oxygen and OH radicals are generated in the photocatalyst module 22. Then, the generated active oxygen and OH radicals decompose viruses, fungi (bacteria), odorous substances, and the like contained in the air flowing toward the exhaust port. As a result, sterilization and deodorization of the air are performed inside the housing 2.

[0033] Note that "sterilization" means inactivating viruses and bacteria (bacteria) present in the air, and terms such as "disinfection," "sterilization," and "sterilization" can be used instead of "sterilization." Therefore, although the term "sterilization" is used in the embodiments, the term "sterilization" can be replaced with "sterilization," "sterilization," and "sterilization."

[0034] In one example, air treatment is performed by either sterilizing the air using UV-C or sterilizing and deodorizing the air using UV-A and the photocatalyst module 22. When air treatment is performed using ultraviolet light, it is preferable that at least the inner surface of the housing 2 is formed from a material that has a high reflectivity for ultraviolet light. In this case, examples of materials that form the inner surface of the housing 2 include aluminum alloys and stainless steel alloys. Forming the inner surface of the housing 2 from a material that has a high reflectivity for ultraviolet light effectively prevents ultraviolet light from being emitted to the outside of the housing 2.

[0035] In one example, instead of or in addition to the air treatment using ultraviolet light described above, air treatment using ozone is performed. In this case, an ozone generator is disposed inside the housing 2. Inside the housing 2, air treatment is performed by mixing ozone with air flowing from the inlet toward the outlet. The air mixed with ozone is then discharged to the outside of the housing 2 through the outlet. In this case, the ozone discharged from inside the housing 2 performs at least one of sterilization and deodorization of the air.

[0036] 2 and 3, a light-shielding member 25 is provided in the assembly 17. In the assembly 17, the light-shielding member 25 is disposed on the side opposite the photocatalytic module 22 from the side where the processing space 18 is located. Therefore, the light-shielding member 25 is disposed closer to the opening 15 than the photocatalytic module 22. The light-shielding member 25 is formed, for example, from a resin and is capable of blocking ultraviolet light. Inside the housing 2, the light-shielding member 25 blocks ultraviolet light emitted from the ultraviolet light source 21 and ultraviolet light reflected on the inner surface of the housing 2 after being emitted from the ultraviolet light source 21. Since the light-shielding member 25 blocks ultraviolet light, the ultraviolet light is effectively prevented from being emitted to the outside of the housing 2 through the opening 15. Furthermore, air flows from the inlet to the outlet through the light-shielding member 25.

[0037] 2 and 3, a light blocking member 26 is provided in the assembly (first assembly) 16. In the assembly 16, the light blocking member 26 is disposed between the fan 20 and the ultraviolet light source 21 in the height direction. Therefore, the light blocking member 26 is disposed on the side of the fan 20 where the processing space 18 is located, and on the opposite side of the ultraviolet light source 21 from the side where the processing space 18 is located. The light blocking member 26 is disposed at a position farther from the opening 13 than the fan 20, and is disposed at a position closer to the opening 13 than the ultraviolet light source 21. The light blocking member 26 is formed, for example, from resin by injection molding.

[0038] The light-shielding member 26 is capable of blocking ultraviolet light. Inside the housing 2, the light-shielding member 26 blocks ultraviolet light that is emitted from the ultraviolet light source 21 and then reflected on the inner surface of the housing 2. Since the light-shielding member 26 blocks ultraviolet light, the ultraviolet light is effectively prevented from being emitted to the outside of the housing 2 through the opening 13. Furthermore, air passes through the light-shielding member 26 and flows from the inlet toward the outlet.

[0039] Furthermore, the assembly (first assembly) 16 includes resonance generating sections 27 and 28. Each of the resonance generating sections 27 and 28 generates resonance in response to the incidence of sound waves. That is, each of the resonance generating sections 27 and 28 generates air resonance when air vibrations are incident on it. The resonance generated by the resonance generating sections 27 and 28 cancels (reduces) sound in a specific frequency range corresponding to the operating sound of the fan 20.

[0040] The resonance generating unit (first resonance generating unit) 27 is disposed in a region inside the housing 2 where air passes through the light blocking member 26. Therefore, the resonance generating unit 27 is disposed between the processing space 18 and the fan 20, and is disposed on the side of the fan 20 where the processing space 18 is located. The resonance generating unit 27 is disposed at a position farther away from the opening 13, which serves as an inlet or outlet, than the fan 20.

[0041] The resonance generating units (second resonance generating units) 28 are provided in the same number as the fans 20, one for each fan 20. Each resonance generating unit 28 is attached to a corresponding one of the fans 20 and is adjacent to the corresponding one of the fans 20 from the side where the opening 13 is located. Therefore, the resonance generating unit 28 is disposed between the opening 13 and the fan 20, and is disposed on the opposite side of the fan 20 from the side where the processing space 18 is located. The resonance generating unit 28 is disposed closer to the opening 13, which serves as an inlet or outlet, than the fan 20.

[0042] FIG. 4 is a perspective view showing the configuration of the assembly (first assembly) 16 in the embodiment, and FIG. 5 is a perspective view showing the assembly (first assembly) 16 in the embodiment, with the fan 20 and the resonance generating unit (second resonance generating unit) 28 omitted. As shown in FIGS. 4 and 5 , the assembly 16 and the light blocking member 26 have a depth direction (the direction indicated by arrows X3 and X4), a width direction (the direction indicated by arrows Y3 and Y4) that intersects (is perpendicular or substantially perpendicular to) the depth direction, and a height direction (the direction indicated by arrows Z3 and Z4) that intersects (is perpendicular or substantially perpendicular to) both the depth direction and the width direction. The assembly 16 and the light blocking member 26 are disposed inside the housing 2 with the depth direction aligned with the depth direction of the housing 2, the width direction aligned with the width direction of the housing 2, and the height direction aligned with the height direction of the housing 2.

[0043] In addition, one side of the assembly 16 in the height direction is the upper side (arrow Y3 side), and the side opposite the upper side in the height direction is the lower side (arrow Y4 side). In the assembly 16, the ultraviolet light source 21, the light blocking member 26, the fan 20, and the resonance generating unit 28 are arranged in this order from the bottom in the height direction. The assembly 16 is arranged inside the housing 2 with the upper side in the height direction coinciding or approximately coinciding with the upper side of the housing 2.

[0044] As shown in FIGS. 4 and 5 , the assembly 16 includes an installation frame 30. The installation frame 30 includes a top panel 31 and a pair of side panels 32 and 33. The top panel 31 is sandwiched between the fan 20 and the light-shielding member 26 in the height direction of the assembly 16. In the installation frame 30, the fan 20 is attached to the top panel 31 from above in the height direction. The light-shielding member 26 is adjacent to the top panel 31 from below in the height direction. The top panel 31 has through-holes 34 formed therethrough in the height direction of the assembly 16 (the height direction of the housing 2). The top panel 31 has the same number of through-holes 34 as the fans 20, one for each fan 20. Each fan 20 is attached to the top panel 31 so that it faces a corresponding one of the through-holes 34 from above in the height direction.

[0045] The side plate 32 is connected to one edge of the top plate 31 in the depth direction. The side plate 33 is connected to an edge of the top plate 31 opposite the edge to which the side plate 32 is connected in the depth direction. Each of the side plates 32, 33 extends downward in the height direction from a connection position with the top plate 31. The side plate 32 is adjacent to the light-blocking member 26 from one side in the depth direction of the assembly 16 (the depth direction of the housing 2). The side plate 33 is adjacent to the light-blocking member 26 from the side opposite the side plate 32 in the depth direction of the assembly 16. In the assembly 16, the light-blocking member 26 is disposed between the side plates 32, 33 in the width direction.

[0046] Fig. 6 is a perspective view showing the assembly (first assembly) 16 in the embodiment, with the fan 20, the resonance generating unit (second resonance generating unit) 28, and the installation frame 30 omitted. Fig. 7 is a perspective view showing the assembly (first assembly) 16 in the embodiment, cut along a cross section passing through the light blocking member 26 and perpendicular or substantially perpendicular to the height direction, and Fig. 8 is a perspective view showing an enlarged portion of Fig. 7. Furthermore, Fig. 9 is a perspective view showing the configuration of the light blocking member 26 of the assembly (first assembly) 16 in the embodiment.

[0047] As shown in FIGS. 6 to 9 , the light blocking member 26 includes a plurality of light blocking plate portions 35. The plurality of light blocking plate portions 35 are aligned along the width direction of the light blocking member 26 (the width direction of the assembly 16). Therefore, in the light blocking member 26, the width direction coincides or substantially coincides with the arrangement direction of the plurality of light blocking plate portions 35. A plurality of air flow paths 36A, 36B are formed in the light blocking member 26, and a corresponding one of the air flow paths 36A, 36B is formed between a pair of light blocking plate portions 35 that are arranged adjacent to each other in the width direction of the light blocking member 26. In addition, in the light blocking member 26, the air flow paths 36A, 36B are formed such that the air flow paths 36A, 36B are aligned alternately in the width direction.

[0048] Inside the housing 2, in the region where the light blocking member 26 is arranged, air flows toward the exhaust port through the ventilation channels 36A, 36B. The multiple ventilation channels 36A, 36B are separated and partitioned from each other by multiple light blocking plate portions 35. Therefore, inside the housing 2, in the region where the air passes through the light blocking member 26, the air flow path from the inlet to the exhaust port branches into multiple ventilation channels 36A, 36B that are independent from each other.

[0049] Each of the light-shielding plate portions 35 includes a pair of inclined plate portions 37 and 38. In each of the light-shielding plate portions 35, the inclined plate portion 37 is inclined with respect to the height direction of the light-shielding member 26, and the inclined plate portion 38 is inclined with respect to the height direction of the light-shielding member 26 at an inclination opposite to that of the inclined plate portion 37. In each of the light-shielding plate portions 35, the upper end of the inclined plate portion 38 is connected to the lower end of the inclined plate portion 37. In each of the light-shielding plate portions 35, the cross-sectional shape in a cross section perpendicular or substantially perpendicular to the depth direction of the light-shielding member 26 is V-shaped or substantially V-shaped with the connecting portion of the inclined plate portions 37 and 38 as the apex. Because the light-shielding plate portions 35 are formed as described above, air can pass through each of the air passages 36A and 36B, but light such as ultraviolet light is blocked by the light-shielding plate portions 35 in each of the air passages 36A and 36B.

[0050] Furthermore, the light blocking member 26 is formed with a plurality of relay plate portions 41A, 41B. In the light blocking member 26, the plurality of relay plate portions 41A, 41B are formed integrally with the plurality of light blocking plate portions 35. In the light blocking member 26, the relay plate portion 41A is arranged at one end portion in the depth direction, and the relay plate portion 41B is arranged at the end portion opposite the relay plate portion 41A in the depth direction. In addition, in the region where air passes through the light blocking member 26, one relay plate portion (first relay plate portion) 41A is provided for each of the air flow paths (first air flow paths) 36A, and one relay plate portion (second relay plate portion) 41B is provided for each of the air flow paths (second air flow paths) 36B.

[0051] A pair of light-shielding plates 35 forming air flow path 36A are connected together by a corresponding one of relay plates 41A. A pair of light-shielding plates 35 forming air flow path 36B are connected together by a corresponding one of relay plates 41B. In each of the light-shielding plates 35 forming air flow path 36A, relay plate 41A is connected to one end of the light-shielding member 26 in the depth direction. In each of the light-shielding plates 35 forming air flow path 36B, relay plate 41B is connected to an end of the light-shielding member 26 on the opposite side in the depth direction from the side on which relay plate 41A is located.

[0052] As described above, in the light blocking member 26, the air flow paths 36A and 36B are arranged alternately in the width direction. Therefore, in the light blocking member 26, portions where the relay plate portion 41A connects (relays) between a pair of adjacently arranged light blocking plate portions 35 and portions where the relay plate portion 41B connects (relays) between a pair of adjacently arranged light blocking plate portions 35 are formed alternately in the width direction. Each of the relay plate portions 41A covers a corresponding one of the air flow paths 36A from one side in the depth direction of the light blocking member 26. Furthermore, each of the relay plate portions 41B covers a corresponding one of the air flow paths 36B from the side opposite to the side where the relay plate portion 41A is located in the depth direction of the light blocking member 26.

[0053] 6 to 9, each of the relay plate portions 41A covers a corresponding one of the air flow paths 36A from the side where the side plate portion 33 is located, and each of the relay plate portions 41B covers a corresponding one of the air flow paths 36B from the side where the side plate portion 32 is located. In addition, in the installation frame 30, the side plate portion 33 is adjacent to the relay plate portion 41A from the outer side in the depth direction of the light blocking member 26 (assembly 16), and the side plate portion 32 is adjacent to the relay plate portion 41B from the outer side in the depth direction of the light blocking member 26 (assembly 16). Because the light blocking plate portion 35 and the relay plate portions 41A and 41B are formed as described above, the light blocking member 26 has a zigzag shape when projected from the height direction, in which folded portions formed by the relay plate portion 41A and folded portions formed by the relay plate portion 41B are alternately formed.

[0054] In the light blocking member 26, each of the air flow paths 36A opens on the side opposite to the side on which the relay plate 41A is located in the depth direction. In the light blocking member 26, each of the air flow paths 36B opens on the side opposite to the side on which the relay plate 41B is located in the depth direction. In the assembly 16, the side plate 32 of the installation frame 30 covers each of the air flow paths 36A from the side opposite to the relay plate 41A. Each opening of the air flow path 36A is blocked by the side plate 32. In the assembly 16, the side plate 33 of the installation frame 30 covers each of the air flow paths 36B from the side opposite to the relay plate 41B. Each opening of the air flow path 36B is blocked by the side plate 33.

[0055] In each of the air flow paths 36A, the distance between adjacent light blocking plates 35 decreases as the air flow path 36A approaches the relay plate 41A in the depth direction. Therefore, each of the air flow paths 36A is formed in a tapered shape such that the dimension of the air flow path 36A along the width direction of the light blocking member 26 increases as the air flow path 36A moves away from the relay plate 41A. Furthermore, in each of the air flow paths 36B, the distance between adjacent light blocking plates 35 decreases as the air flow path 36A moves toward the relay plate 41B in the depth direction. Therefore, each of the air flow paths 36B is formed in a tapered shape such that the dimension of the air flow path 36B along the width direction of the light blocking member 26 increases as the air flow path 36A moves away from the relay plate 41B. Because the air flow paths 36A and 36B are formed as described above, when the light blocking member 26 is formed by injection molding, the air flow paths 36A and 36B can be appropriately removed from the mold.

[0056] The resonance generating unit (first resonance generating unit) 27 includes a plurality of resonance generators (first resonance generators) 42. In the example shown in FIGS. 6 to 9 , the same number of resonance generators 42 as the number of airflow paths 36A, 36B formed in the light blocking member 26 are provided, with one resonance generator 42 provided for each of the airflow paths 36A, 36B. Inside the housing 2, in a region where air passes through the light blocking member 26, one of the resonance generators 42 is disposed in each of the airflow paths 36A, 36B. Note that it is sufficient that one or more resonance generators 42 are disposed in each of the airflow paths 36A, 36B, and in one example, a plurality of resonance generators 42 may be disposed in at least one of the airflow paths 36A, 36B. In the following description, the resonance generator 42 disposed in the air flow path 36A will also be referred to as the resonance generator 42A, and the resonance generator 42 disposed in the air flow path 36B will also be referred to as the resonance generator 42B.

[0057] Each of the resonance generators 42 includes a neck tube portion 43 and a body portion 45. In each of the resonance generators 42, the body portion 45 is connected to a corresponding one of the relay plates 41A and 41B. That is, in each of the resonance generators 42A, the body portion 45 is connected to a corresponding one of the relay plates 41A, and in each of the resonance generators 42B, the body portion 45 is connected to a corresponding one of the relay plates 41B. In each of the resonance generators 42, the body portion 45 protrudes from a corresponding one of the relay plates 41A and 41B toward a corresponding one of the air flow paths 36A and 36B. Therefore, in each of the resonance generators 42, the body portion 45 protrudes inward in the depth direction of the light-blocking member 26 from the connected relay plate (a corresponding one of 41A and 41B).

[0058] In each of the resonance generators 42, the neck tube portion 43 is connected to the body portion 45 from the side opposite to the relay plate portion (corresponding one of 41A and 41B). In each of the resonance generators 42, the neck tube portion 43 protrudes from the body portion 45 on the side opposite to the side where the relay plate portion (corresponding one of 41A and 41B) is located. Therefore, in each of the resonance generators 42, the neck tube portion 43 protrudes from the body portion 45 toward the corresponding one of the air flow paths 36A and 36B, and protrudes relative to the body portion 45 toward the inside in the depth direction of the light-blocking member 26.

[0059] In each of the resonance generators 42, a cavity (internal cavity) is formed inside the body portion 45, and a passage communicating with the cavity of the body portion 45 is formed inside the neck tube portion 43. In each of the resonance generators 42, an opening of a passage is formed at the protruding end of the neck tube portion 43 that protrudes from the body portion 45, and the passage of the neck tube portion 43 opens at the opening toward a corresponding one of the air flow paths 36A, 36B. Therefore, in each of the resonance generators 42, the cavity of the body portion 45 communicates with a corresponding one of the air flow paths 36A, 36B via the passage of the neck tube portion 43. That is, in each of the resonance generators 42, the neck tube portion 43 communicates between the interior (internal cavity) of the body portion 45 and a corresponding one of the air flow paths 36A, 36B.

[0060] In one example, the body portion 45 and neck tube portion 43 of each resonance generator 42 form a part of the light-blocking member 26. In the light-blocking member 26, the body portion 45 and neck tube portion 43 of the resonance generator 42 are formed integrally with the light-blocking plate portion 35 and relay plate portions 41A, 41B. In this case, for example, by forming the light-blocking member 26 from resin by injection molding, the light-blocking member 26 is formed in which the body portion 45 and neck tube portion 43 of the resonance generator 42 are integral with the light-blocking plate portion 35 and relay plate portions 41A, 41B.

[0061] In another example, the body portion 45 and the neck tube portion 43 of each resonance generator 42 are formed from a separate member from the light-blocking member 26. Then, the body portion 45 and the neck tube portion 43 of each resonance generator 42 are attached to the light-blocking member 26 by a corresponding one of the relay plates 41A, 41B. In this way, the body portion 45 of each resonance generator 42 is connected to a corresponding one of the relay plates 41A, 41B. In this example, the body portion 45 and the neck tube portion 43 of each resonance generator 42 may be formed from a material different from that of the light-blocking member 26. For example, the body portion 45 and the neck tube portion 43 of each resonance generator 42, which are formed from metal, may be attached to the light-blocking member 26, which is formed from resin by injection molding.

[0062] Furthermore, in each of resonance generators 42, the cavity inside body portion 45 opens to the side opposite to the side on which neck tube portion 43 is located, at the through-hole that penetrates the corresponding one of relay plate portions 41A, 41B. Therefore, in each of resonance generators 42, the cavity in body portion 45 opens outward in the depth direction of light-blocking member 26, and opens to the side opposite to the side on which the air flow path (the corresponding one of 36A, 36B) is located.

[0063] In the assembly 16, the opening of the cavity in each body portion 45 of the resonance generator 42A is closed by the side plate portion 33 of the installation frame 30. The opening of the cavity in each body portion 45 of the resonance generator 42B is closed by the side plate portion 32 of the installation frame 30. A sealing member 46 such as a packing is disposed in the opening of the cavity in the body portion 45 of each of the resonance generators 42. Each sealing member 46 is flexible and adhesive. At the opening of the cavity in each body portion 45 of the resonance generator 42A, the sealing member 46 maintains an airtight seal between the corresponding relay plate portion 41A and the side plate portion 33. At the opening of the cavity in each body portion 45 of the resonance generator 42B, the sealing member 46 maintains an airtight seal between the corresponding relay plate portion 41B and the side plate portion 32.

[0064] With this configuration, in each of the resonance generators 42, the seal member 46 prevents air from leaking from the cavity of the body portion 45 through the opening. Also, in each of the resonance generators 42, as described above, the cavity of the body portion 45 communicates with a corresponding one of the air flow paths 36A, 36B via the passage of the neck tube portion 43. Therefore, in each of the resonance generators 42, air can flow into the cavity of the body portion 45 through the passage of the neck tube portion 43, and air can flow out from the cavity of the body portion 45 through the passage of the neck tube portion 43.

[0065] 6 to 9, in the resonance generating unit (first resonance generating unit) 27, each of the multiple resonance generators 42 is partially constituted by a neck tube portion 43, a body portion 45, and a seal member 46. Each of the resonance generators 42 is partially constituted by a portion that closes the opening of the cavity in the body portion 45 in the side plate portion (corresponding one of 32 and 33).

[0066] In one example, side plate portions 32, 33 may not be provided on installation frame 30. In this case, the opening of the cavity in each body portion 45 of resonance generator 42A is closed, for example, by rear wall 6 of housing 2. Also, the opening of the cavity in each body portion 45 of resonance generator 42B is closed, for example, by front wall 5 of housing 2. Then, at the opening of the cavity in each body portion 45 of resonance generator 42, a seal member 46 keeps the gap between the corresponding one of relay plate portions 41A, 41B and the inner surface of housing 2 airtight. In each of the resonance generators 42, the neck tube portion 43 is formed to be thinner than the body portion 45, and the cross-sectional area of the passage in the neck tube portion 43 is smaller than the cross-sectional area of the cavity in the body portion 45. Therefore, in each of the resonance generators 42, the cross-sectional area of the space portion changes at the connection position of the neck tube portion 43 to the body portion 45, and the cross-sectional area of the space portion increases toward the body portion 45. In each of the resonance generators 42, the volume of the cavity in the body portion 45 is larger than the volume of the passage in the neck tube portion 43.

[0067] In each of the resonance generators 42, the neck tube portion 43 is formed in a cylindrical shape. In each of the neck tube portions 43 of the resonance generators 42, the cross-sectional area of the passage is constant or approximately constant from the connection position to the body portion 45 to the protruding end (opening). In the example shown in Figures 6 to 9, the neck tube portion 43 of each of the resonance generators 42 is formed in a cylindrical shape, but the neck tube portion 43 may be formed in a polygonal cylindrical shape, such as a triangular cylindrical shape, as long as it is cylindrical.

[0068] 6 to 9, the body portion 45 of each of the resonance generators 42 is formed in a cylindrical shape, but the body portion 45 may be formed in a cylindrical shape other than a cylindrical shape, such as a polygonal cylindrical shape. The body portion 45 of each of the resonance generators 42 may be formed in a shape other than a cylindrical shape, such as a spherical shell shape or a hemispherical shell shape. However, in each of the resonance generators 42, regardless of the shape of the body portion 45, the cross-sectional area of the space portion at the connection position of the neck tube portion 43 to the body portion 45 increases toward the body portion 45. In each of the resonance generators 42, the volume of the cavity in the body portion 45 is larger than the volume of the passage in the neck tube portion 43.

[0069] Each resonance generator 42 generates resonance (air resonance) when sound waves (air vibrations) enter the passage of the neck tube portion 43 from a corresponding one of the air flow paths 36A, 36B. In this case, each resonance generator 42 generates resonance in response to the incident sound waves, for example, using a principle similar to that of a Helmholtz resonator. The resonance generated by each resonance generator 42 has a specific natural frequency. Each resonance generator 42 cancels out sounds in a specific frequency range with the sound waves generated by the resonance. This reduces sounds in the specific frequency range. The specific frequency range in which sounds are canceled out by the sound waves generated by the resonance includes the natural frequency of the resonance and frequencies near the natural frequency. Furthermore, in this embodiment, each resonance generator 42 is configured such that the specific frequency range corresponds to the operating noise of the fan 20.

[0070] Here, in the resonance generator 42, the length (dimension) L of the neck tube portion 43 from the connection position to the body portion 45 to the protruding end (opening), the cross-sectional area S of the passage of the neck tube portion 43, and the volume V of the cavity (internal cavity) of the body portion 45 are specified. The natural frequency f0 of the resonance generated by the resonance generator 42 is calculated using the above-mentioned parameters and the sound speed c as shown in equation (1). Furthermore, the sound speed c is calculated using the air density ρ, specific heat ratio γ, and pressure p as shown in equation (2).

[0071]

number

[0072] In designing each of the resonance generators 42, the length L of the neck tube portion 43, the cross-sectional area S of the passage of the neck tube portion 43, and the volume V of the cavity of the body portion 45 are adjusted so that the natural frequency f0 calculated using equations (1) and (2) falls within the frequency range corresponding to the operating noise of the fan 20. At this time, the length L, cross-sectional area S, and volume V of each of the resonance generators 42 are adjusted, taking into consideration the environment in which the air treatment device 1 is used, etc., so that the natural frequency f0 falls within the frequency range corresponding to the operating noise of the fan 20.

[0073] 10 is a perspective view showing the configuration of one fan 20, the resonance generating unit 28 attached to that fan 20, and the vicinity thereof in an assembly (first assembly) 16 according to the embodiment. The following explanation will mainly focus on the configuration of one fan 20 and the resonance generating unit 28 attached to that fan 20. Note that the configuration of the other fans 20 will be similar to the configurations described below, and the configurations of the resonance generating units 28 attached to those fans 20 will be similar to the configurations described below.

[0074] As shown in FIG. 10 , the fan 20 includes a fan frame 51 and a fan rotating unit 52 rotatably attached to the fan frame 51. The fan rotating unit 52 is rotatable about a rotation axis P. When the fan 20 is operating, the fan rotating unit 52 rotates relative to the fan frame 51, generating an airflow from the inlet to the outlet inside the housing 2, as described above. The fan 20 has three defined directions: an axial direction along the rotation axis P, a circumferential direction around the rotation axis P, and a radial direction intersecting (perpendicular or substantially perpendicular to) both the axial and circumferential directions. The radial side of the fan 20 facing the rotation axis P is the inner circumferential side, and the radial side away from the rotation axis P is the outer circumferential side. The fan 20 is disposed inside the housing 2 with its axial direction aligned with the height direction of the housing 2.

[0075] In the fan 20, a space is formed on the inner circumferential side of the fan frame 51, and the fan rotation section 52 is disposed in the space on the inner circumferential side of the fan frame 51. Therefore, in the fan 20, the fan rotation section 52 is disposed on the inner circumferential side of the fan frame 51, and the fan rotation section 52 is surrounded by the fan frame 51 from the outer circumferential side over the entire circumferential direction. The fan rotation section 52 includes a fan motor section 53 and a plurality of blade sections 55. In the fan rotation section 52, the rotation axis P passes through the fan motor section 53, and each of the blade sections 55 protrudes from the fan motor section 53 toward the outer circumferential side of the fan 20. In addition, in the fan 20, the protruding ends of each of the blade sections 55 from the fan motor section 53 form the outer circumferential ends of the fan rotation section 52.

[0076] Furthermore, in fan rotating section 52, multiple blade sections 55 are arranged side by side in the circumferential direction of fan 20, and gaps are formed between adjacent blade sections 55 in the circumferential direction. In fan rotating section 52, air flows through the gaps between blade sections 55. Furthermore, when fan rotating section 52 is rotating, i.e., when fan 20 is operating, the air flow velocity is faster in the region where blade sections 55 are arranged than in the region where fan motor section 53 is arranged.

[0077] The resonance generating unit 28 is attached to the fan frame 51 adjacent to the fan 20 from one axial side of the fan 20. The resonance generating unit 28 includes a base plate 60, stays 61, and pillars 62. The base plate 60, stays 61, and pillars 62 are formed integrally from, for example, resin by injection molding. In the example shown in FIG. 10 , the resonance generating unit 28 is provided with four stays 61. Each stay 61 is connected to the base plate 60 and extends from its connection to the base plate 60 toward the outer periphery of the fan 20. Therefore, in the resonance generating unit 28, the stays 61 protrude from the base plate 60 toward the outer periphery of the fan 20. The four stays 61 are arranged relative to one another in the circumferential direction of the fan 20. In the example shown in FIG. 10 , each stay 61 is arranged 90° or approximately 90° apart from its adjacent stay 61 in the circumferential direction.

[0078] The protruding ends of each of the stay portions 61 from the base plate portion 60 are positioned on the outer periphery of the fan 20 relative to the outer periphery of the fan rotating portion 52. Therefore, each of the stay portions 61 extends beyond the outer periphery of the fan rotating portion 52 toward the outer periphery of the fan 20. Each of the stay portions 61 is connected to the fan frame 51 at the end portion protruding from the base plate portion 60, i.e., at the outer periphery. Connecting the stay portions 61 to the fan frame 51 attaches the base plate portion 60 to the fan frame 51. When the base plate portion 60 is attached to the fan frame 51, the base plate portion 60 does not protrude, or protrudes very little, toward the outer periphery of the fan 20 relative to the fan motor portion 53.

[0079] The pillar-shaped portion 62 is connected to the base plate portion 60 and extends from the connection position to the base plate portion 60 toward the opposite side to the side on which the fan 20 is located. The pillar-shaped portion 62 extends along the axial direction of the fan 20 and is arranged coaxially or approximately coaxially with the rotation axis P of the fan 20. In the example of FIG. 10 , the entire pillar-shaped portion 62 is arranged on the inner circumferential side of the outer circumferential edge of the fan motor portion 53 and the outer circumferential edge of the base plate portion 60.

[0080] In the resonance generating unit 28, one or more attachment members 72 are attached to the base plate 60. In this embodiment, a plurality of attachment members 72 are attached to the base plate 60, and in the example of FIG. 10 , eight attachment members 72 are attached to the base plate 60. In one example, each of the attachment members 72 is attached to the base plate 60 by snap fitting. Each of the attachment members 72 is attached to the base plate 60 from the side opposite to the side on which the fan 20 is located in the axial direction of the fan 20. Each of the attachment members 72 is made of resin, for example, and is integrally formed by injection molding or the like.

[0081] Fig. 11 is a perspective view showing one fan 20, the resonance generating unit 28 attached to the fan 20, and the surrounding configuration in an assembly (first assembly) 16 according to the embodiment, taken along a cross section that passes through an attachment member 72 of the resonance generating unit 28 and is perpendicular or substantially perpendicular to the axial direction of the fan 20. Fig. 12 is a perspective view showing one fan 20, the resonance generating unit 28 attached to the fan 20, and the surrounding configuration in an assembly (first assembly) 16 according to the embodiment, with the attachment member 72 omitted. Fig. 13 is a perspective view showing the configuration of any one of the attachment members 72 in the resonance generating unit (second resonance generating unit) 28 according to the embodiment.

[0082] 10 to 13, each of the attachment members 72 includes a body portion 73 and a neck tube portion 75. The resonance generating unit (second resonance generating unit) 28 is formed with the same number of resonance generators (second resonance generators) 71 as the attachment members 72, and each of the attachment members 72 forms one resonance generator 71. Therefore, each of the resonance generators 71 is partially constituted by a corresponding one of the body portion 73 and neck tube portion 75 of the attachment member 72. Furthermore, in each of the attachment members 72, the body portion 73 and neck tube portion 75 are integrally formed.

[0083] As described above, each resonance generator 71 is provided with a body portion 73 and a neck tube portion 75, and thus the resonance generating unit 28 is provided with the same number of neck tube portions 75 as the body portions 73. The resonance generating unit 28 is provided with one neck tube portion 75 corresponding to each body portion 73.

[0084] In the resonance generating unit 28, each of the body portions 73 is installed on the base plate 60 on the side opposite to the side on which the fan 20 is located in the axial direction of the fan 20. Each of the body portions 73 is adjacent to the base plate 60 on the side opposite to the side on which the fan 20 is located. In the example shown in FIGS. 10 to 12 , in the resonance generating unit 28, the multiple body portions 73 are arranged side by side along the circumferential direction of the fan 20. The body portions 73 are also arranged between the outer circumferential edge of the base plate 60 and the columnar portion 62 in the radial direction of the fan 20. The columnar portion 62 is covered from the outer periphery of the fan 20 by the assembly of the multiple body portions 73. Each of the body portions 73 does not protrude, or protrudes very little, toward the outer periphery of the fan 20 relative to the fan motor unit 53 and the base plate 60.

[0085] In each of the resonance generators 71 (attachment members 72), the neck tube portion 75 is connected to the body portion 73 from the outer periphery of the fan 20. In each of the resonance generators 71, the neck tube portion 75 protrudes from the body portion 73 toward the outer periphery of the fan 20. That is, each of the neck tube portions 75 protrudes from a corresponding one of the body portions 73 toward the outer periphery of the fan 20. In the resonance generating unit 28, the neck tube portion 75 of each of the attachment members 72 protrudes toward the outer periphery of the fan 20 relative to the base plate portion 60. In the assembly 16, the neck tube portion 75 of each of the attachment members 72 protrudes toward the outer periphery of the fan 20 relative to the fan motor portion 53.

[0086] In the assembly 16, the protruding ends of the neck tube portions 75 of each of the attachment members 72 are disposed on the inner peripheral side of the fan 20 relative to the outer peripheral end of the fan rotating part 52. The neck tube portions 75 of the attachment members 72 are adjacent to the region where the blade portions 55 of the fan rotating part 52 are disposed, from one axial side of the fan 20. When the fan 20 is operating, i.e., when the fan rotating part 52 is rotating, the air flow velocity passing through the region where the protruding ends of the neck tube portions 75 are located is faster than the air flow velocity passing through the region where the body portion 73 is located, in each of the attachment members 72 (resonance generators 71).

[0087] In each of the resonance generators 71 (attachment members 72), a cavity (internal cavity) is formed inside the body portion 73, and a passage communicating with the cavity of the body portion 73 is formed inside the neck tube portion 75. In each of the resonance generators 71, a passage opening is formed at the protruding end of the neck tube portion 75 that protrudes from the body portion 73, and the passage of the neck tube portion 75 opens to the outside at the opening. Therefore, in each of the resonance generators 71, the cavity of the body portion 73 communicates with the outside via the passage of the neck tube portion 75. That is, in each of the resonance generators 71, the neck tube portion 75 communicates the interior (internal cavity) of the body portion 73 with the outside. In the assembly 16, in each of the resonance generators 71, the passage of the neck tube portion 75 opens toward the outer periphery of the fan 20.

[0088] 13 and other figures, in each of the attachment members 72, the body portion 73 includes an upper plate portion 81, an inner circumferential plate portion 82, an outer circumferential plate portion 83, a pair of side plate portions 85 and 86, and an inclined plate portion 87. In the assembly 16 and the resonance generating unit 28, in each of the body portions 73 of the attachment members 72, the upper plate portion 81 covers the cavity from the side opposite to the side where the fan 20 and the base plate portion 60 are located, in the axial direction of the fan 20. In each of the body portions 73 of the attachment members 72, the inner circumferential plate portion 82 covers the cavity from the inner circumferential side of the fan 20, and the outer circumferential plate portion 83 and the inclined plate portion 87 cover the cavity from the outer circumferential side of the fan 20. In each body portion 73 of the attachment member 72, the side plate portion 85 covers the cavity from one side in the circumferential direction of the fan 20, and the side plate portion 86 covers the cavity from the opposite side of the side plate portion 85 in the circumferential direction of the fan 20.

[0089] In each of the resonance generators 71, the cavity inside the body portion 73 opens toward the side where the fan 20 is located in the axial direction of the fan 20. In the resonance generating unit 28, the opening of the cavity in the body portion 73 of each of the resonance generators 71 is closed by the base plate portion 60. With this configuration, in each of the resonance generators 71, the cavity inside the body portion 73 is surrounded by the body portion 73 and the base plate portion 60. In each of the resonance generators 71, the cavity surrounded by the body portion 73 and the base plate portion 60 communicates with the outside via the passage of the neck tube portion 75. In the resonance generating unit 28, each of the multiple body portions 73 forms a cavity therein, thereby forming multiple cavities. In the resonance generating unit 28, the multiple cavities are isolated from each other by the multiple body portions 73 and the base plate portion 60.

[0090] In each of the resonance generators 71, a sealing member 76 such as a packing is disposed at the opening of the cavity in the body portion 73. The sealing member 76 is flexible and adhesive. At the opening of the cavity in the body portion 73 of each of the resonance generators 71, the sealing member 76 maintains an airtight seal between the body portion 73 and the base plate portion 60. With this configuration, in each of the resonance generators 71, the sealing member 76 prevents air from leaking from the cavity in the body portion 73 through the opening. In addition, in each of the resonance generators 71, air can flow into the cavity in the body portion 73 through the passage in the neck tube portion 75, and air can flow out from the cavity in the body portion 73 through the passage in the neck tube portion 75.

[0091] As described above, in the example of FIGS. 10 to 12 , in the resonance generating unit (second resonance generating unit) 28, each of the multiple resonance generators 71 is partially constituted by a neck tube portion 75, a body portion 73, and a seal member 76. Each of the resonance generators 71 is partially constituted by a portion of the base plate portion 60 that closes the opening of the cavity in the body portion 73. Note that in the example of FIGS. 10 to 12 , one seal member 76 is provided for each of the multiple body portions 73. However, in one example, only one seal member is provided in the resonance generating unit 28. In this case as well, in each of the resonance generators 71, the gap between the base plate portion 60 and the body portion 73 is kept airtight by the seal member at the opening of the cavity in the body portion 73.

[0092] Furthermore, in each of the resonance generators 71, the neck tube portion 75 is formed to be thinner than the body portion 73, and the cross-sectional area of the passage in the neck tube portion 75 is smaller than the cross-sectional area of the cavity in the body portion 73. Therefore, in each of the resonance generators 71, the cross-sectional area of the space portion changes at the connection position of the neck tube portion 75 to the body portion 73, and the cross-sectional area of the space portion increases toward the body portion 73. Furthermore, in each of the resonance generators 71, the volume of the cavity in the body portion 73 is larger than the volume of the passage in the neck tube portion 75. Furthermore, in each of the resonance generators 71, the neck tube portion 75 is formed in a cylindrical shape. Furthermore, in each of the neck tube portions 75 of the resonance generators 71, the cross-sectional area of the passage is constant or approximately constant from the connection position to the body portion 73 to the protruding end (opening).

[0093] Each resonance generator 71 generates resonance (air resonance) when sound waves (air vibrations) enter the passage of the neck tube portion 43 from the outer periphery of the fan 20. Each resonance generator 71 generates resonance using a principle similar to that of a Helmholtz resonator, for example. Like the resonance generator 42, each resonance generator 71 cancels out and reduces sounds within a specific frequency range using sound waves generated by resonance. The resonance generated by each resonance generator 71 also has a specific natural frequency, and the specific frequency range in which sound is canceled out by the sound waves generated by resonance includes the natural frequency of the resonance and frequencies near the natural frequency. Furthermore, each resonance generator 71 is configured so that the specific frequency range corresponds to the operating noise of the fan 20.

[0094] Here, in the resonance generator 71, the length (dimension) L of the neck tube portion 75 from the connection position to the body portion 73 to the protruding end (opening), the cross-sectional area S of the passage of the neck tube portion 75, and the volume V of the cavity (internal cavity) of the body portion 73 are specified. In this case, the natural frequency f0 of the resonance generated by the resonance generator 71 is calculated using the above-mentioned parameters and the sound speed c according to the above-mentioned formula (1). Therefore, in the design of each resonance generator 71, the length L, cross-sectional area S, and volume V of each resonance generator 71 are adjusted so that the natural frequency f0 is included in the frequency range corresponding to the operating noise of the fan 20.

[0095] In each resonance generator 71, the inclined plate portion 87 extends between the upper plate portion 81 and the outer peripheral plate portion 83 in the axial direction of the fan 20. In the body portion 73 of each resonance generator 71, the inclined plate portion 87 is inclined with respect to the axial direction of the fan 20 and has a gradient with respect to the axial direction of the fan 20. In each resonance generator 71 (attachment member 72), the inclined plate portion 87 of the body portion 73 is inclined so that it approaches the inner periphery of the fan 20 as it moves away from the fan 20 in the axial direction of the fan 20.

[0096] Furthermore, in the body portion 73 of each resonance generator 71, a neck tube portion 75 is connected to the outer circumferential plate portion 83. In each resonance generator 71, the neck tube portion 75 protrudes from the outer circumferential plate portion 83 of the body portion 73 toward the outer periphery of the fan 20. In each resonance generator 71 (attachment member 72), a wing portion 77 is formed on the outer surface of the neck tube portion 75. When the fan rotating portion 52 is rotating, that is, when the fan 20 is operating, the wing portion 77 of the neck tube portion 75 of the attachment member 72 straightens the flow of air.

[0097] As described above, in the embodiment, the resonance generating units 27, 28 are disposed inside the housing 2, and each of the resonance generating units 27, 28 generates resonance in response to the incidence of sound waves, thereby canceling out sounds in a specific frequency range corresponding to the operating noise of the fan 20. As a result, even if the output of the fan 20 is increased, the operating noise of the fan 20 is canceled out by the resonance generated by the resonance generating units 27, 28. This makes it possible to appropriately reduce noise caused by the operating noise of the fan 20, even if the output of the fan 20 is increased. Therefore, by increasing the output of the fan 20 while reducing the noise caused by the operating noise of the fan 20, it is possible to increase the air flow rate inside the housing 2. In other words, it is possible to improve air processing performance while reducing noise caused by the operating noise of the fan 20.

[0098] Furthermore, in the above-described embodiment and the like, the resonance generating unit 27 is disposed in a region inside the housing 2 where the air passes through the light blocking member 26. This makes it possible to effectively utilize the region where the light blocking member 26, a necessary component for air treatment using ultraviolet light, is disposed to reduce noise caused by the operating sound of the fan 20. Furthermore, in the above-described embodiment and the like, the air flow path is branched into a plurality of air flow paths 36A, 36B that are independent of each other in the region where the air passes through the light blocking member 26. One or more resonance generators 42 are disposed in each of the plurality of air flow paths 36A, 36B. This allows the resonance generators 42 to further appropriately reduce the operating sound of the fan 20 in the region where the air passes through the light blocking member 26.

[0099] Furthermore, in the above-described embodiment and the like, an air flow path (a corresponding one of 36A and 36B) is formed between a pair of light-shielding plate portions 35 arranged along the width direction of the light-shielding member 26, and an intermediate plate portion (a corresponding one of 41A and 41B) connecting the pair of light-shielding plate portions 35 covers the air flow path (a corresponding one of 36A and 36B) from one side in the depth direction of the light-shielding member 26. Furthermore, in the resonance generator 42, the body portion 45 is connected to the intermediate plate portion (a corresponding one of 41A and 41B) of the light-shielding member 26, and protrudes from the intermediate plate portion (a corresponding one of 41A and 41B) toward the air flow path (a corresponding one of 36A and 36B). In resonance generator 42, neck tube portion 43 protrudes from body portion 45 on the side opposite to the side where relay plate portion (corresponding one of 41A and 41B) is located, and neck tube portion 43 provides communication between the inside of body portion 45 and the air flow path (corresponding one of 36A and 36B). With this configuration, resonance generator 42 is appropriately formed in the region where air passes through light-blocking member 26.

[0100] Furthermore, in one example of the above-described embodiments, the body portion 45 and neck tube portion 43 of the resonance generator 42 form part of the light-shielding member 26, and are formed integrally with the light-shielding plate portion 35 and relay plate portions 41A, 41B in the light-shielding member 26. This makes it possible to form the body portion 45 and neck tube portion 43 of the resonance generator 42 integrally with the light-shielding member 26 by injection molding or the like, thereby reducing the effort required to manufacture the resonance generator 42.

[0101] Furthermore, the resonance generating unit 28 is attached to the fan frame 51 adjacent to the fan 20 from one axial side of the fan 20. This allows the resonance generating unit 28 to be disposed inside the housing 2 at a position adjacent to the fan 20 in the axial direction, and the resonance generating unit 28, which reduces the operating noise of the fan 20 through resonance, can be disposed near the fan 20. Therefore, the noise caused by the operating noise of the fan 20 is further appropriately reduced.

[0102] In the resonance generating unit 28 of the embodiment and other examples, a body portion 73 is attached to a base plate portion 60 attached to the fan frame 51 on the side opposite the side where the fan 20 is located. The base plate portion 60 and the body portion 73 cooperate to enclose a cavity (internal cavity). In the resonance generating unit 28, a neck tube portion 75 protrudes from the body portion 73 toward the outer periphery of the fan 20, and the cavity enclosed by the body portion 73 and the base plate portion 60 communicates with the outside through the neck tube portion 75. With this configuration, the resonance generator 71 is appropriately formed at a position adjacent to the fan 20 in the axial direction. Furthermore, because the neck tube portion 75 protrudes from the body portion 73 toward the outer periphery of the fan 20, when the fan 20 is operating, the opening of the passage of the neck tube portion 75 is located in an area where the flow velocity of the passing air is high. This further appropriately reduces the operating noise of the fan 20.

[0103] In the resonance generating unit 28 of the embodiment and the like, a plurality of body portions 73 are arranged on the base plate 60 in a line along the circumferential direction of the fan 20, and a plurality of cavities isolated from one another by the body portions 73 are formed. In the resonance generating unit 28, each of the plurality of neck tube portions 75 protrudes from a corresponding one of the body portions 73 toward the outer periphery of the fan 20, connecting the cavity surrounded by the corresponding one of the body portions 73 and the base plate 60 to the outside. With this configuration, sound waves can be incident on the plurality of resonance generators 71 from different angular positions relative to one another in the circumferential direction of the fan 20. This further appropriately reduces the operating noise of the fan 20.

[0104] Furthermore, in the resonance generating unit 28 of the embodiment and the like, the body portion 73 includes an inclined plate portion 87 that is inclined with respect to the axial direction of the fan 20, and the inclined plate portion 87 covers the cavity surrounded by the body portion 73 and the base plate portion 60 from the outer periphery side of the fan 20. The inclined plate portion 87 is inclined so that the farther it is from the fan 20 in the axial direction of the fan 20, the more it is inclined toward the inner periphery of the fan 20. This prevents turbulence in the air flow caused by the resonance generating unit 28, even if the resonance generating unit 28 is provided in a position adjacent to the fan 20 in the axial direction.

[0105] Furthermore, in the embodiment and the like, the resonance generating section 28 is disposed between the opening 13 and the fan 20. Therefore, the operating noise of the fan 20 is reduced by the resonance generating section 28 before it reaches the opening 13. This effectively prevents the operating noise of the fan 20 from being transmitted outside the housing 2 without being reduced, and further appropriately reduces the impact of noise caused by the operation of the fan 20.

[0106] In the embodiment, the resonance generating unit 27 is disposed between the processing space 18 and the fan 20. Therefore, the operating noise of the fan 20 is reduced by the resonance generating unit 27 before it reaches the processing space 18, which is a relatively large space. This effectively prevents the sound caused by the operating noise of the fan 20 from being amplified in the processing space 18, and further appropriately reduces the impact of the noise caused by the operation of the fan 20.

[0107] In the above-described embodiment, the resonance generating unit 28 is attached to each of the fans 20 from the side where the opening 13 is located. However, in one modified example, the resonance generating unit 28 may be attached to each of the fans 20 from the side where the processing space 18 is located. In another modified example, a pair of resonance generating units 28 is attached to each of the fans 20. In this case, one of the pair of resonance generating units 28 is attached to each of the fans 20 from the side where the opening 13 is located, and the other of the pair of resonance generating units 28 is attached to each of the fans 20 from the side where the processing space 18 is located.

[0108] In one variation, a sound collection unit (not shown) such as a microphone and a sound transmission unit (not shown) such as a small speaker are provided inside the housing 2 near the fan 20. The air treatment device 1 is also equipped with a control unit (not shown). The control unit is composed of a processor or integrated circuit and a storage medium such as memory. The processor or integrated circuit constituting the control unit includes any of a CPU (Central Processing Unit), ASIC (Application Specific Integrated Circuit), microcomputer, FPGA (Field Programmable Gate Array), DSP (Digital Signal Processor), etc. The control unit may include only one integrated circuit, etc., or multiple integrated circuits, etc. The control unit may also include only one storage medium, or multiple storage media.

[0109] In this modified example, the sound collection unit detects sound by collecting it. The control unit controls the overall operation of the air treatment device 1. For example, the control unit controls the operation of the sound emission unit and controls the emission of sound from the sound emission unit. When the fan 20 is operating, the control unit acquires the sound detection results from the sound collection unit. Then, based on the detection results from the sound collection unit, the control unit controls the operation of the sound emission unit and causes the sound emission unit to emit sound that is in the opposite phase to the sound detected by the sound collection unit. As a result, the operating sound of the fan 20 is canceled out by the sound emitted from the sound emission unit, and active noise cancellation of the operating sound of the fan 20 is performed.

[0110] In this modification, the operating sound of the fan 20 is canceled by the resonance generated by the resonance generating units 27 and 28, and the sound emitted from the sound emitting unit also cancels the operating sound of the fan 20. Therefore, the noise caused by the operating sound of the fan 20 is further appropriately reduced.

[0111] In one variation, a sound emitting unit such as a small speaker is disposed inside the housing 2 near the fan 20. When the fan 20 is operating, the sound emitting unit emits sound, superimposing the sound from the sound emitting unit on the operating sound of the fan 20. This converts the operating sound of the fan 20 into a sound that is pleasant to the user of the air processing device 1. In one example, the sound emitting unit emits environmental sounds that promote peaceful sleep, and the operating sound of the fan 20 is converted into white noise that promotes peaceful sleep.

[0112] In this modification, the resonance generated by the resonance generating units 27 and 28 cancels out the operating noise of the fan 20, and the sound emitted from the sound emitting unit converts the operating noise of the fan 20 into a sound that is pleasant to the user of the air processing device 1. Therefore, the noise caused by the operating noise of the fan 20 is further appropriately reduced.

[0113] According to at least one of these embodiments, a resonance generating unit is disposed inside the housing, and the resonance generating unit generates resonance in response to the incident sound waves, thereby canceling out sounds in a specific frequency range corresponding to the operating noise of the fan, thereby providing an air treatment device that can improve air treatment performance while reducing noise caused by the operating noise of the fan.

[0114] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0115] 1...air treatment device, 2...housing, 13...opening (first opening), 15...opening (second opening), 20...fan, 21...ultraviolet light source, 22...photocatalyst module, 26...light-shielding member, 27...resonance generating unit (first resonance generating unit), 28...resonance generating unit (second resonance generating unit), 35...light-shielding plate portion, 36A, 36B...air flow path, 41A, 41B...relay plate portion, 42 (42A, 42B)...resonance generator (first resonance generator), 43...neck tube portion, 45...body portion, 51...fan frame, 52...fan rotating portion, 60...base plate portion, 71...resonance generator (second resonance generator), 72...attachment member, 73...body portion, 75...neck tube portion, 87...inclined plate portion.

Claims

1. a housing in which an inlet and an outlet are formed as openings to the outside; a fan that is disposed inside the housing and that, when activated, creates an air flow inside the housing that flows from the inlet to the outlet; an air treatment unit that performs air treatment on the air flowing from the inlet to the outlet inside the housing; a resonance generating unit disposed inside the housing, which generates resonance in response to the incidence of sound waves, thereby canceling out sounds in a specific frequency range corresponding to the operating noise of the fan; An air treatment device comprising:

2. the air treatment unit includes an ultraviolet light source that emits ultraviolet light inside the housing, and performs the air treatment using the ultraviolet light emitted from the ultraviolet light source; a light-shielding member that blocks the ultraviolet light emitted from the ultraviolet light source and through which the air flowing from the inlet to the outlet passes, within the interior of the housing; the resonance generating unit is disposed in a region inside the housing where the air passes through the light blocking member; 10. The air treatment device of claim 1.

3. the light-blocking member branches the air flow path into a plurality of ventilation flow paths that are independent from each other in the region where the air passes through the light-blocking member; the resonance generating unit includes a plurality of resonance generators, One or more of the plurality of resonance generators are disposed in each of the plurality of ventilation channels.

3. The air treatment device of claim 2.

4. The light blocking member is a pair of light-shielding plate portions arranged along the width direction of the light-shielding member in a state in which an air flow passage through which the air passes is formed between the pair of light-shielding plate portions; a relay plate portion that connects the pair of light-shielding plate portions and covers the air flow path between the pair of light-shielding plate portions from one side in a depth direction of the light-shielding member that intersects with the width direction of the light-shielding member; Equipped with the resonance generating unit includes a resonance generator disposed in the air flow path between the pair of light blocking plate units, The resonance generator comprises: a body portion connected to the relay plate portion of the light blocking member and protruding from the relay plate portion toward the air flow path; a neck tube portion that protrudes from the body portion toward the side opposite to the side where the relay plate portion is located and that connects the interior of the body portion to the ventilation channel; The air treatment device of claim 2 , comprising:

5. 5. The air treatment device of claim 4, wherein the body portion and the neck tube portion of the resonance generator form part of the light blocking member, and are integrally formed with the pair of light blocking plate portions and the relay plate portion in the light blocking member.

6. The fan is Fun frame and; a fan rotating portion attached to the fan frame in a state rotatable in the circumferential direction of the fan; Equipped with the resonance generating unit is attached to the fan frame adjacent to the fan from one axial side of the fan.

10. The air treatment device of claim 1.

7. The resonance generating unit is a base plate portion attached to the fan frame; a body portion that is installed on the base plate portion on the opposite side to the side where the fan is located in the axial direction of the fan, and that cooperates with the base plate portion to enclose a cavity; a neck pipe portion that protrudes from the body portion toward the outer periphery of the fan and connects the cavity surrounded by the body portion and the base plate portion to the outside; The air treatment device of claim 6 , comprising:

8. In the resonance generating unit, a plurality of body portions are installed on the base plate portion in a state where they are aligned along the circumferential direction of the fan, In the resonance generating unit, each of the plurality of body portions forms one of the cavities, thereby forming a plurality of cavities isolated from one another by the plurality of body portions; In the resonance generating unit, the neck tube portion is provided in correspondence with each of the plurality of body portions, thereby providing a plurality of neck tube portions as the neck tube portion; each of the plurality of neck tube portions protrudes from a corresponding one of the plurality of body portions toward an outer periphery of the fan, and communicates the cavity surrounded by the corresponding one of the plurality of body portions and the base plate portion with the outside; 8. The air treatment device of claim 7.

9. the body portion of the resonance generating unit includes an inclined plate portion inclined with respect to the axial direction of the fan, the inclined plate portion of the body portion covers the cavity surrounded by the body portion and the base plate portion from the outer circumferential side of the fan, and is inclined so that the farther away from the fan in the axial direction of the fan the closer to the inner circumferential side of the fan.

8. The air treatment device of claim 7.

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