Air purifier

Abstract

The purpose of the present disclosure is to provide an air purifier in which a sound having a frequency band that changes due to the propagation of the sound within a housing is reduced. In an air purifier (100), a first muffler (20) is provided separately from a housing (40), and an internal space (21) of the first muffler (20) is disposed so as to be in contact with a first space (24) on the downstream side of a tongue portion (13c) in an air flow generated by a blower (15). As a result, it is also possible to reduce sound that changes in frequency band as a result of sound propagating through the housing (40).

Description

Technical Field

[0001] The invention relates to an air purifier. Background Art

[0002] The air cleaner disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 9-229408) adheres a noise-absorbing material to the inner surface of a casing to thereby provide noise-absorbing measures along the air flow path in the casing. Summary of the invention Technical problem to be solved by the invention

[0003] However, in the above-described structure of the air purifier, there are sound components that are not completely silenced due to the propagation of sound in the air flow path and changes in frequency components, and these sound components propagate to the outside of the device.

[0004] Therefore, there is a technical problem of providing an air purifier that takes measures to eliminate sound whose frequency band changes due to the propagation of sound in the casing. Technical solutions adopted to solve technical problems

[0005] The air purifier of the first viewpoint is an air purifier that blows purified air upward, and includes an air blower, a first muffler, a filter, and a housing. The air blower has an impeller and a housing that accommodates the impeller. The first muffler reduces the noise generated by the drive of the air blower. The filter purifies the air. The housing arranges the air blower, the first muffler, and the filter inside. The first muffler is separately arranged from the housing. An inlet, an outlet, and a tongue portion located between the inlet and the outlet are formed on the housing. The internal space of the first muffler is arranged to contact the first space on the downstream side of the tongue portion in the air flow generated by the air blower.

[0006] In this air purifier, the first silencer 20 is provided separately from the housing 40, and its internal space is arranged to contact the first space downstream of the tongue in the air flow generated by the blower. As a result, the sound whose frequency band changes due to the propagation of the sound in the housing 40 is also suppressed.

[0007] The air cleaner according to the second aspect is the air cleaner according to the first aspect, wherein the first silencer is arranged on the downstream side of the air outlet in the air flow.

[0008] In this air cleaner, noise reduction can be performed outside the casing and before the air flows into the air flow path formed inside the housing, thereby further improving the noise reduction effect.

[0009] The air purifier according to the third aspect is the air purifier according to the first aspect or the second aspect, wherein, in the central portion and the peripheral portion of the first space when viewed from above, air flowing through the peripheral portion contacts the internal space of the first silencer.

[0010] In this air cleaner, the internal space of the first silencer is arranged to be in contact with the air flowing through the peripheral portion of the first space, so that the silencer effect is obtained without obstructing the air flow.

[0011] The air purifier according to a fourth aspect is the air purifier according to any one of the first to third aspects, wherein, in the central portion and the peripheral portion of the first space when viewed from above, air flowing through the central portion does not collide with the first silencer.

[0012] In this air purifier, sound is reduced by canceling out sound waves due to reflection and resonance.

[0013] The air cleaner according to a fifth aspect is the air cleaner according to any one of the first to fourth aspects, wherein the first silencer is located downstream of the blow-off port of the casing in the air flow and is adjacent to the casing.

[0014] In the air purifier, the first silencer is located at a position that can be reasonably set, which is the position closest to the sound source, thereby improving the silencer effect.

[0015] The air purifier of the sixth aspect is based on the air purifier of any one of the first aspect to the fifth aspect, wherein the inner space of the first silencer is a silencer space, and the height dimension of the housing is greater than the height dimension of the first silencer.

[0016] In the air purifier, the internal space can be used to absorb sound energy, thereby improving the sound absorbing effect.

[0017] The air purifier of the seventh aspect is based on the air purifier of any one of the first to sixth aspects, wherein the first muffler is an annular member forming a section of the passage of the air flow. The section is formed in a funnel shape in a manner that the passage area expands as it moves toward the direction of the air flow. In the air purifier, the air passing through the first muffler is widely guided to the filter.

[0018] The air purifier according to an eighth aspect is the air purifier according to any one of the first to seventh aspects, further comprising an active species generating unit that generates active species. The active species generating unit releases the active species to the upstream side of the first muffler in the air flow.

[0019] In this air purifier, the inside of the first silencer is purified by the active species, thereby suppressing the generation of odor, virus, etc.

[0020] The air purifier of the ninth aspect is the air purifier of any one of the first to eighth aspects, further comprising a humidifying unit that releases humidified air. The first silencer 20 is disposed on the upstream side of the humidifying unit in the air flow.

[0021] In this air cleaner, the humidified air does not flow into the interior of the first muffler, and thus the interior of the first muffler is prevented from becoming a humid environment.

[0022] The air purifier according to a tenth aspect is the air purifier according to any one of the first to ninth aspects, wherein the filter is disposed downstream of the first muffler in the air flow, and the first muffler overlaps the filter in a plan view.

[0023] In this air cleaner, moisture generated in the casing is prevented from dripping toward the first muffler.

[0024] The air purifier of the eleventh aspect is based on the air purifier of any one of the first to tenth aspects, and the air purifier also includes a second muffler that reduces the noise generated by the drive of the blower. The second muffler is arranged near the suction port of the housing. In the air purifier, the sound radiated from the suction port is reduced.

[0025] The air purifier according to the twelfth aspect is the air purifier according to the eleventh aspect, wherein the second silencer is located on the upstream side of the suction port of the casing in the air flow and is adjacent to the casing.

[0026] In this air cleaner, the ventilation noise of the air flowing to the air inlet and the "wind shear noise when the impeller sucks the air" radiated toward the air inlet are reduced.

[0027] The air purifier according to the thirteenth aspect is the air purifier according to the eleventh aspect or the twelfth aspect, wherein the inner space of the second silencer is in contact with the second space, which is the space of air flow before being sucked into the impeller of the blower.

[0028] The air purifier of the fourteenth aspect is based on the air purifier of any one of the first to thirteenth aspects, and further includes a third silencer for reducing noise generated by driving the blower. The inner space of the third silencer contacts the third space which is the air flow space after leaving the impeller.

[0029] In this air cleaner, "wind shear noise when the impeller sweeps air" radiated toward the downstream side of the impeller is reduced.

[0030] The air purifier of the fifteenth aspect is based on the air purifier of any one of the eleventh to fourteenth aspects, wherein the air blower is a Sirocco fan having two suction ports. The second silencer is arranged near the suction ports on both sides. In the air purifier, the sound radiated from the two suction ports is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a perspective view of the air cleaner according to this embodiment. Figure 2 Cut using a vertical plane including the fan's rotating axis Figure 1 A cross-sectional view of an air purifier. Figure 3 yes Figure 2 A partial cross-sectional view of the air purifier at line BB. Figure 4 is to Figure 2 Figure 2 shows the blower viewed from the direction of the rotation axis with the grille and pre-filter removed. Figure 5 yes Figure 3 Cross-sectional view of the air purifier at line CC. Fig. 6A It is a perspective view of the appearance of the first muffler. Figure 6B It is a perspective view of a first muffler having no cavity but only holes. Figure 6C This is a perspective view of a first silencer molded from a foamed resin. Fig.6D Yes Fig. 6A A three-dimensional view of a first muffler in which one of the four inner side surfaces is inclined toward the upper outside. Fig. 7A It is a perspective view of the appearance of the second muffler. Figure 7B It is a perspective view of a second muffler having no cavity but only holes. Figure 7C This is a perspective view of a second silencer molded from a foamed resin. Fig.7D Yes Fig. 7A A three-dimensional view of a second muffler in which the upstream end of the inner side surface is inclined toward the outside. Figure 8 It is a partial cross-sectional view of the air cleaner of the first modified example. Fig. 9 It is a perspective view of a first silencer of an air cleaner according to a second modification. Fig.10 It is a perspective view of a first silencer of an air cleaner according to a third modified example. Fig.11It is a perspective view of a second silencer of an air cleaner according to a fourth modified example. DETAILED DESCRIPTION

[0032] (1) Overall structure of air purifier 100 Figure 1 FIG. 1 is a perspective view of the air cleaner 100 according to the present embodiment. Figure 1 In the embodiment, the air purifier 100 inhales air from the inlet opening 100a on the side surface and blows out the purified air from the outlet opening 100b on the top surface.

[0033] Figure 2 The vertical plane including the rotating shaft of the blower 15 is cut. Figure 1 A cross-sectional view of the air purifier 100 is shown. Figure 2 In the figure, the air purifier 100 includes a blower 15, a filter 25, and a humidifying unit 35 arranged in order from the bottom.

[0034] The air purifier 100 has a humidification function and an air purification function. The user can select only the air purification function, but when the humidification function is selected, the air purification function is also provided.

[0035] (2) Detailed structure (2-1) Housing 40 like Figure 1 As shown, the housing 40 forms the outer contour of the air cleaner 100 in the shape of a quadrangular prism.

[0036] In addition, if Figure 2 As shown, the housing 40 includes an air supply chamber 40a, an air purification chamber 40b, and a humidification chamber 40c, which are arranged in this order from bottom to top.

[0037] The blower 15 is disposed in the blower chamber 40a. The filter 25 for air purification is disposed in the air purification chamber 40b. The humidification unit 35 is disposed in the humidification chamber 40c.

[0038] In addition, a first space 24 is provided between the air supply chamber 40a and the air purification chamber 40b. The first space 24 also includes a part of the internal space of the air blower 15, and passes air to the air purification chamber 40.

[0039] (2-2) Blower 15 The blower 15 is a sirocco fan and includes an impeller 11 , a fan motor 12 , and a casing 13 .

[0040] Figure 3 yes Figure 2 A partial cross-sectional view of the air purifier 100 at line BB. Figure 4 is to Figure 2 FIG. 1 is a diagram showing the blower 15 as viewed from the direction of the rotation axis with the grille 90 of the suction opening 100a and the pre-filter 90 removed.

[0041] exist Figure 3 and Figure 4 In the embodiment, the impeller 11 includes a hub 11 a and a plurality of blades 11 b arranged in a cylindrical shape on the periphery of the hub 11 a. The impeller 11 is accommodated in a casing 13 .

[0042] The housing 13 has a suction port 13a, a blowout port 13b, a tongue 13c, a scroll body 13d, a diffuser 13e, and a bell mouth 13f. The suction port 13a is a circular opening concentric with the impeller 11, and the bell mouth 13f is provided at the edge of the circular opening.

[0043] The tongue portion 13c protrudes toward the inside of the housing 13, and the protruding end thereof is close to the impeller 11. The scroll body 13d extends from the tongue portion 13c so as to surround the impeller 11 in the circumferential direction, thereby forming a guide path for guiding air to the diffuser 13e.

[0044] The diffuser 13e guides the air guided by the scroll body 13d to the air outlet 13b.

[0045] The impeller 11 is driven to rotate by the fan motor 12, so that air is sucked from the suction port 13a along the direction of the rotation axis and blown out from the blade 11b in a centrifugal direction. The air blown out from the blade 11b in a centrifugal direction advances along the vortex body 13d of the housing 13 and blown out from the blow-out port 13b via the diffuser 13e. The blown air enters the air purification chamber 40b.

[0046] (2-3) Filter 25 The filter 25 is arranged in the air purification chamber 40b. The filter 25 is arranged at a position downstream of the blower 15 and upstream of the humidification unit 35 in the flow direction of the air.

[0047] The filter 25 removes dust contained in the air sucked into the air purifier 100 and removes components that cause odors, thereby purifying the air. Therefore, the filter 25 includes a dust collecting filter 25a and a deodorizing filter 25b. The dust collecting filter 25a removes dust contained in the air. The deodorizing filter 25b removes components that cause odors contained in the air. The deodorizing filter 25b is arranged on the downstream side of the air flow direction relative to the dust collecting filter 25a.

[0048] (2-4) Active Species Generating Unit 30 like Figure 2As shown, the active species generating unit 30 is arranged between the suction opening 100a of the housing 40 and the housing 13 of the blower 15. The active species generating unit 30 generates active species and releases the active species to the upstream side of the first silencer 20 in the air flow. In the air purifier 100, the inside of the first silencer 20 is purified by the active species, thereby suppressing the generation of odor, virus, etc.

[0049] (2-5) Humidification unit 35 The humidifying unit 35 is arranged in the humidifying chamber 40c. The humidifying unit 35 vaporizes the supplied water to humidify the air. The humidifying unit 35 is arranged on the downstream side of the filter 25 in the flow direction of the air.

[0050] The humidifying unit 35 includes a tank 351 , a tray 352 , an element 353 , and a motor 354 .

[0051] The element 353 is driven by the motor 354, and the peripheral edge of the element 353 passes through the water stored in the tray 352. The water is vaporized from the element 353 containing the water, thereby humidifying the air. The water in the tray 352 is supplied from the tank 351.

[0052] The tank 351 , the tray 352 , and the element 353 are attachable to and detachable from the humidification chamber 40 c of the housing 40 .

[0053] (2-6) First silencer 20 The first muffler 20 reduces the sound generated by the driving of the blower 15. Figure 3 As shown, the first silencer 20 is provided separately from the casing 40 and is located on the downstream side of the blow-out port 13 b in the air flow generated by the blower 15 .

[0054] Here, “provided separately from the housing 40 ” means that the first muffler 20 is not used as a part of the housing 40 .

[0055] Figure 5 yes Figure 3 A cross-sectional view of the air purifier 100 at the CC line. Fig. 6A 2 is a perspective view of the appearance of the first muffler 20. Figure 5 and Fig. 6A In the embodiment, the first silencer 20 is formed into a square ring shape and is arranged along the edge of the air outlet 13b so as to surround the air outlet 13b.

[0056] (2-6-1) Resonance type Here, the resonance type first silencer 20 will be described. A plurality of holes 21a are formed on the inner side surface 211 of the first silencer 20. In addition, a cavity 21b is formed inside the first silencer 20.

[0057] The hole 21a is connected to the cavity 21b, and the hole 21a and the cavity 21b are called the internal space 21. The internal space 21 is a Helmholtz resonance type space. However, the internal space 21 is not limited to the Helmholtz resonance type, and can also be a muffler type or a side branch type space. Sound absorbing materials such as glass wool and foamed polyurethane can also be arranged in the internal space 21.

[0058] In addition, if Figure 3 As shown, in this embodiment, there is a first space 24 downstream of the tongue 13 of the housing 13 and upstream of the filter 25. The first space 24 is a space on the downstream side of the tongue 13c before the air blown out from the blowout port 13b flows into the air flow path formed inside the housing 40.

[0059] Preferably, the height dimension of the housing 13 is greater than the height dimension of the first muffler 20 , and the height dimension from the tongue portion 13 c of the housing 13 to the blow-out port 13 b is greater than the height dimension of the first muffler 20 .

[0060] The internal space 21 of the first muffler 20 is arranged in contact with the first space 24. Here, "the internal space 21 is in contact with the first space 24" means that the internal space 21 is open to the first space 24. The first muffler 20 does not need to be in close contact with the periphery of the blow-out port 13b, and is arranged so as not to obstruct the air flow in the first space 24.

[0061] The air suction sound generated by the rotation of the impeller 11, the wind shearing sound when the impeller 11 draws in the air, the ventilation sound generated when the air blown out from the impeller 11 in the centrifugal direction passes through the scroll body 13d, etc. are propagated from the blower 15 through the air.

[0062] When the sound hits the inner side surface 211 of the first muffler 20, the air of the hole 21a vibrates at a frequency close to the resonance frequency and converts the sound energy into heat energy by friction with the surroundings, so the sound is reduced.

[0063] (2-6-2) Orifice plate type In addition, you can also apply Figure 6B The first silencer 20 of the perforated plate type is shown, which has only the hole 21a. In this case, the hole 21a forms the inner space 21.

[0064] exist Figure 6B Even with the structure having only the hole 21a, the sound can be absorbed by the hole 21a of the first muffler 20, and the sound energy is converted into heat energy by the friction with the vibration of the air, thereby suppressing the reverberation.

[0065] (2-6-3) Porous type also, Fig. 6AAnd the hole 21a of the first silencer 20 described in FIG. 6 is a hole of a size visible to the naked eye, but the structure is not limited to this.

[0066] For example, a porous first silencer 20 may be applied. Figure 6C is a perspective view of the first silencer 20 formed of a foamed resin. Figure 6C In the embodiment, the first muffler 20 is formed by a foamed resin, and therefore, there are numerous holes on its surface that cannot be seen visually, and there are bubbles inside these holes. Even with such a structure, sound enters the bubbles from the numerous holes, and thus the sound energy is also converted into heat energy, and therefore, the sound is reduced.

[0067] (2-6-4) Other shapes exist Fig. 6A , Figure 6B as well as Figure 6C In the first silencer 20 described above, the four inner side surfaces 211 are in a shape that stands vertically, but the present invention is not limited to this. Fig.6D Yes Fig. 6A A three-dimensional view of the first muffler 20 in which one of the four inner side surfaces 211 is inclined toward the upper outside.

[0068] exist Fig.6D In the embodiment, the section surrounded by the four inner side surfaces 211 of the first muffler 20 forms a section of the passage of the air flow. Therefore, since at least one inner side surface 211 is formed to be inclined outward toward the upstream of the air flow, the section is formed into a funnel shape, and the passage area increases toward the direction of the air flow.

[0069] Figure 3 The first muffler 20 shown adopts Fig.6D In the first muffler 20 described above, the inclination angle of the inner side surface 211 corresponds to the inclination angle of the diffuser 13e on the tongue portion 13c side. Therefore, the air passing through the tongue portion 13c side can smoothly flow from the diffuser 13e to the inner side surface 211 of the first muffler 20.

[0070] Since the filter 25 is arranged downstream of the first muffler 20 in the air flow, the passage area of ​​the section surrounded by the inner surface 211 increases toward the air flow direction, and the air passing through the first muffler 20 is widely guided to the filter 25 .

[0071] (2-7) Second silencer 50 like Figure 4 As shown, the second muffler 50 is disposed along the outer periphery of the bell mouth 13f to surround the bell mouth 13f. The second muffler 50 reduces the sound emitted toward the suction port 13a, such as the suction sound of air generated by the rotation of the impeller 11 and the wind noise when the impeller 11 sucks in air.

[0072] (2-7-1) Resonance type Here, the resonance type second silencer 50 will be described. Fig. 7A FIG. 2 is a perspective view of the appearance of the second muffler 50. Fig. 7A In the embodiment, a plurality of holes 51 a are formed on the inner peripheral surface 511 of the second muffler 50 . In addition, a cavity 51 b is formed inside the second muffler 50 .

[0073] The hole 51a is connected to the cavity 51b, and the hole 51a and the cavity 51b are called the internal space 51. The internal space 51 is a Helmholtz resonance type space. However, the internal space 51 is not limited to the Helmholtz resonance type, and can also be a muffler type or a side branch type space. Sound absorbing materials such as glass wool and foamed polyurethane can also be arranged in the internal space 51.

[0074] In addition, if Figure 2 As shown, in the present embodiment, the air flow space before being sucked in by the impeller 11 of the blower 15 is defined as the second space 52 , and the internal space 51 of the second muffler 50 is disposed so as to be in contact with the second space 52 .

[0075] Here, “the internal space 51 is in contact with the second space 52 ” means a state in which the internal space 51 is open to the first space 52 .

[0076] The suction sound of air generated by the rotation of the impeller 11, the wind noise when the impeller 11 sucks in the air, and the like are radiated from the air blower 15 toward the suction port 13 a.

[0077] When the sound hits the inner peripheral surface 511 of the second muffler 50, the air of the hole 51a vibrates at a frequency close to the resonance frequency and converts the sound energy into heat energy by friction with the surroundings, so the sound is reduced.

[0078] (2-7-2) Orifice plate type In addition, you can also apply Figure 7B The second silencer 50 of the perforated plate type is shown as having only the hole 51a. In this case, the hole 51a forms the inner space 51.

[0079] exist Figure 7B Even with the structure having only the hole 51a, the sound can be absorbed by the hole 51a of the second muffler 50, and the sound energy is converted into heat energy by the friction with the vibration of the air, thereby suppressing the reverberation.

[0080] (2-7-3) Porous type also, Fig. 7A as well as Figure 7B The hole 51a of the second muffler 50 described above is a hole of a size visible to the naked eye, but the present invention is not limited to such a structure.

[0081] For example, a multi-hole type second silencer 50 may also be applied. Figure 7C is a perspective view of the second silencer 50 formed of a foamed resin. Figure 7C In the embodiment, the second muffler 50 is formed by a foamed resin, so there are countless holes on its surface that cannot be seen visually and bubbles inside these holes. Even with such a structure, sound enters the bubbles from countless holes, so that sound energy is also converted into heat energy, and therefore, the sound is reduced.

[0082] (2-7-4) Other shapes exist Fig. 7A , Figure 7B as well as Figure 7C In the second muffler 50 described above, the inner peripheral surface 511 is in a vertically standing shape, but the present invention is not limited to this. Fig.7D Yes Fig. 7A A perspective view of the second muffler 50 in which the upstream end of the inner peripheral surface 511 is inclined toward the outside.

[0083] exist Fig.7D In the embodiment, the section surrounded by the inner circumferential surface 511 of the second muffler 50 forms a section of the passage of the air flow. Therefore, by forming the upstream end of the inner circumferential surface 511 to be inclined toward the outside, the section is formed into a funnel shape, and the passage area gradually decreases toward the direction of the air flow. As a result, the sound generated by the upstream end (edge) of the inner circumferential surface 511 of the second muffler 50 when air is inhaled can be suppressed.

[0084] (3) Operation of the air purifier 100 and air flow exist Figure 2 , Figure 3 as well as Figure 4 In the embodiment, when the power is turned on to the air purifier 100, the fan motor 12 of the blower 15 rotates the impeller 11. The impeller 11 blows out the air in the centrifugal direction, so the pressure near the rotation axis of the impeller 11 decreases, and the air is sucked into the suction port 13a located at the center of the impeller 11. As a result, a flow of air from the suction port 13a toward the center of the impeller 11 is generated.

[0085] Relatively large dust is removed by the pre-filter 80 disposed on the front surface of the suction port 13a.

[0086] like Figure 4 As shown, the second muffler 50 is arranged to surround the bell mouth 13f, so the second muffler 50 reduces the sound radiated toward the suction port 13a, such as the air suction sound generated by the rotation of the impeller 11 and the wind shear sound when the impeller 11 sucks in the air.

[0087] The air blown out from the impeller 11 in the centrifugal direction is guided to the diffuser 13e through the vortex body 13d, and blown out from the blow-out port 13b to the first space 24. Figure 3 As shown, the first muffler 20 is arranged to surround the air outlet 13 b , and the internal space 21 of the first muffler 20 is in contact with the first space 24 .

[0088] Therefore, the air flowing through the peripheral portion of the first space 24 flows in contact with the internal space 21 of the first silencer 20, so that the air flow is not blocked and the sound waves are cancelled out by reflection and resonance to achieve a silencing effect.

[0089] The air blown into the first space 24 passes through the dust collecting filter 25 a , whereby dust contained in the air is removed.

[0090] The air that has passed through the dust collecting filter 25a passes through the deodorizing filter 25b, whereby components that cause odor are removed.

[0091] exist Figure 2 In the embodiment, the air after passing through the filter 25 is guided to the element 353 of the humidification unit 35. When the humidification function of the air purifier 100 is turned on, the element 353 is rotated by the motor 354. The element 353 is configured in the tray 352, and the lower part of the element 353 is immersed in water. Therefore, through the rotation of the element 353, the newly immersed part in the water absorbs the water of the tray 352. The air passing through the element 353 promotes the vaporization of the water immersed in the element 353. As a result, the air becomes humidified air.

[0092] The humidified air passing through the element 353 becomes a vertically upward air flow and is blown out from the blow-out opening 100b.

[0093] When the humidification function is off, the element 353 does not rotate, and the air passing through the element 353 is blown out from the blow-out opening 100 b without being almost humidified.

[0094] (4) Features (4-1) In the air purifier 100, the first silencer 20 is provided separately from the housing 40, and its internal space 21 is arranged to contact the first space 24 on the downstream side of the tongue 13c in the air flow generated by the blower 15. As a result, the sound whose frequency band changes due to the propagation of the sound in the housing 40 is also suppressed.

[0095] (4-2) In the air cleaner 100 , the first silencer 20 is disposed downstream of the outlet 13 b in the air flow, and thus can silence the air outside the casing 13 before the air flows into the air flow path formed inside the housing 40 .

[0096] (4-3) In the air cleaner 100 , the internal space 21 of the first silencer 20 is arranged to be in contact with the air flowing through the peripheral portion of the first space 24 , so that the noise reduction effect is obtained without obstructing the air flow.

[0097] (4-4) In the air cleaner 100, in the central portion and the peripheral portion of the first space 24 in a plan view, the air flowing through the central portion does not collide with the first muffler 20. In addition, the sound is reduced by canceling the sound waves due to reflection and resonance.

[0098] (4-5) In the air purifier 100, the first muffler 20 is located downstream of the outlet 13b of the housing 13 in the air flow and adjacent to the housing 13. As a reasonable position, the first muffler 20 is located closest to the sound source, thereby improving the muffler effect.

[0099] (4-6) In the air purifier 100, the internal space 21 of the first muffler 20 is a muffler space, and is a space of any one of a muffler type, a side branch type, and a Helmholtz resonance type. The internal space 21 may also have a sound absorbing material. The internal space 21 can absorb sound energy, thereby improving the muffler effect.

[0100] (4-7) In the air cleaner 100 , the first muffler 20 is formed in a funnel shape so that the passage area increases toward the direction of the air flow, and therefore, the air passing through the first muffler 20 is widely guided to the filter 25 .

[0101] (4-8) The air purifier 100 includes an active species generating unit 30 for generating active species. The active species generating unit 30 releases active species to the upstream side of the first silencer 20 in the air flow, thereby purifying the interior of the first silencer 20 and suppressing the generation of odor, virus, etc.

[0102] (4-9) In the air cleaner 100 , the first muffler 20 is disposed upstream of the humidifying unit 35 in the air flow, and the humidified air does not flow into the first muffler 20 , thereby preventing the interior of the first muffler 20 from becoming a humid environment.

[0103] (4-10) In the air cleaner 100 , the filter 25 is disposed on the downstream side of the first muffler 20 in the air flow. The first muffler 20 and the filter 25 overlap each other in a plan view, thereby preventing moisture generated in the housing 40 from dripping into the first muffler 20 .

[0104] (4-11) In the air cleaner 100 , the second silencer 50 is disposed near the air inlet 13 a of the casing 13 , and reduces the sound radiated from the air inlet 13 a .

[0105] (4-12) In the air purifier 100, the second silencer 50 is located on the upstream side of the air inlet 13a of the shell 13 in the air flow and is adjacent to the shell 13, thereby reducing the ventilation sound of the air flowing to the air inlet 13a and the "wind shear sound when the impeller draws in the air" radiated toward the air inlet 13a side.

[0106] (4-13) In the air cleaner 100, the internal space 51 of the second silencer 50 is in contact with the second space 52. The second space 52 is a space where air flows before being sucked into the impeller 11 of the blower 15.

[0107] (5) Modification (5-1) First Modification Figure 8 FIG. 1 is a partial cross-sectional view of the air cleaner 100 according to the first modified example. Figure 8 In the embodiment, the air cleaner 100 further includes a third silencer 60 different from the second silencer 50 in order to reduce noise generated by driving the blower 15 .

[0108] In the first modification, the internal space 61 of the third silencer 60 is in contact with the third space 63 which is the air flow space after leaving the impeller 11 .

[0109] In the first modification, “the wind noise generated when the impeller 11 sweeps in the air” radiated toward the downstream side of the impeller 11 is reduced.

[0110] (5-2) Second Modification Fig. 9 FIG. 2 is a perspective view of the first silencer 20 of the air cleaner 100 according to the second modified example. Fig. 9 In the embodiment, the first silencer 20 has a shape obtained by placing two square ring-shaped silencers adjacent to each other. This shape increases the effective volume of the first silencer 20. As a result, the noise reduction effect is further improved.

[0111] (5-3) Third Modification Fig.10FIG. 2 is a perspective view of the first silencer 20 of the air cleaner 100 according to the third modified example. Fig.10 In, with Fig. 6A The first silencer described above is different in that four inner side surfaces 211 are removed. As a result, the cavity 21b forms the inner space 21, and the sound silencing effect is exerted by canceling the sound waves caused by reflection and resonance. However, the inner side surfaces 211 may be partially left.

[0112] (5-4) Fourth Modification Fig.11 FIG. 1 is a perspective view of the second silencer 50 of the air cleaner 100 according to the fourth modified example. Fig.11 In, with Fig. 7A The difference of the second silencer described is that the inner peripheral surface 511 is removed. As a result, the cavity 51b forms the internal space 51, and the sound silencing effect is exerted by canceling the sound waves caused by reflection and resonance. However, the inner peripheral surface 511 may be partially left.

[0113] As mentioned above, although the embodiment of this disclosure is described, it should be understood that various changes in form and details can be made without departing from the spirit and scope of this disclosure described in the claims. Industrial Applicability

[0114] In the present embodiment and its variations, a so-called tower-type air purifier is described as an example in which air is sucked in from two suction ports of a Sirocco fan and blown upward through a dust collecting filter and a deodorizing filter located downstream of the blow-out port of the Sirocco fan.

[0115] However, the present disclosure is not limited to the tower-type air purifiers described above. For example, the present disclosure can also be applied to a so-called box-type air purifier in which a dust collecting filter and a deodorizing filter are arranged on the upstream side of a single-side suction port of a Sirocco fan, and air is sucked in from a single-side suction port of the Sirocco fan through the dust collecting filter and the deodorizing filter and blown upward from a blow-out port. Explanation of symbols

[0116] 11. Impeller; 13 housing; 13a suction port; 13b blowing outlet; 13c tongue; 15. Blower; 20 first silencer; 21 internal space; 24 First Space; 25 filters; 30 active species generating unit; 35 humidification units; 40 housing; 50 second silencer; 51 internal space; 52 Second Space; 60 third silencer; 61 internal space; 63 Third Space; 100 air purifiers. Prior art literature Patent Literature

[0117] Patent Document 1: Japanese Patent Application Laid-Open No. 9-229408

Claims

1. An air purifier (100), wherein the air purifier blows out purified air, characterized in that: include: A blower (15), the blower comprising an impeller (11) and a casing (13) for accommodating the impeller (11); a first muffler (20) for reducing noise generated by driving the blower (15); a filter (25) for purifying the air; and a housing (40), wherein the air blower (15), the first silencer (20) and the filter (25) are arranged inside the housing, The first muffler (20) is disposed separately from the housing (40). The housing (13) is formed with an inlet (13a), an outlet (13b) and a tongue (13c), wherein the tongue is located between the inlet (13a) and the outlet (13b). The internal space (21) of the first silencer (20) is arranged to be in contact with a first space (24) on the downstream side of the tongue portion (13c) in the air flow generated by the blower (15).

2. The air purifier (100) according to claim 1, characterized in that: The first silencer (20) is arranged on the downstream side of the blow-off port (13b) in the air flow.

3. The air purifier (100) according to claim 1 or 2, characterized in that: In a central portion and a peripheral portion of the first space (24) when viewed from above, air flowing through the peripheral portion contacts the internal space (21) of the first muffler (20).

4. The air purifier (100) according to any one of claims 1 to 3, characterized in that: In the central portion and the peripheral portion of the first space (24) when viewed from above, air flowing through the central portion does not collide with the first muffler (20).

5. The air purifier (100) according to any one of claims 1 to 4, characterized in that: The first silencer (20) is located on the downstream side of the blow-off port (13b) of the casing (13) in the air flow and is adjacent to the casing (13).

6. The air purifier (100) according to any one of claims 1 to 5, characterized in that: The internal space (21) of the first muffler (20) is a muffler space, The height dimension of the housing (13) is greater than the height dimension of the first muffler (20).

7. The air purifier (100) according to any one of claims 1 to 6, characterized in that: The first silencer (20) is an annular member forming one section of the passage of the air flow. The section is formed in a funnel shape so that a passage area increases toward the direction of the air flow.

8. The air purifier (100) according to any one of claims 1 to 7, characterized in that: The air purifier further comprises an active species generating unit (30) for generating active species. The active species generating unit (30) releases the active species toward the upstream side of the first silencer (20) in the air flow.

9. The air purifier (100) according to any one of claims 1 to 8, characterized in that: The air purifier further includes a humidifying unit (35) for releasing humidified air. The first silencer (20) is arranged on the upstream side of the humidifying unit (35) in the air flow.

10. The air purifier (100) according to any one of claims 1 to 9, characterized in that: The filter (25) is arranged on the downstream side of the first silencer (20) in the air flow, and the first silencer (20) and the filter (25) overlap each other in a plan view.

11. The air purifier (100) according to any one of claims 1 to 10, characterized in that: The air purifier further comprises a second silencer (50) for reducing noise generated by driving the blower (15). The second muffler (50) is arranged near the suction port (13a) of the casing (13).

12. The air purifier (100) according to claim 11, characterized in that: The second silencer (50) is located on the upstream side of the suction port (13a) of the casing (13) in the air flow and is adjacent to the casing (13).

13. The air purifier (100) according to claim 11 or 12, characterized in that: The internal space (51) of the second silencer (50) is in contact with a second space (52), and the second space is a space for air flow before being sucked into the impeller (11) of the blower (15).

14. The air purifier (100) according to any one of claims 1 to 13, characterized in that: The air purifier further comprises a third silencer (60) for reducing noise generated by driving the blower (15). The inner space (61) of the third silencer (60) is in contact with a third space (63), which is the air flow space after leaving the impeller (11).

15. The air purifier (100) according to any one of claims 11 to 14, characterized in that: The air blower (15) is a Sirocco fan having two suction ports (13a). The second silencer (50) is arranged near the two suction ports (13a).

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