WO2024034586A1

WO2024034586A1 - Air cleaner

Info

Publication number: WO2024034586A1
Application number: PCT/JP2023/028831
Authority: WO
Inventors: 大佑深堀; 昂大西林
Original assignee: ダイキン工業株式会社
Priority date: 2022-08-12
Filing date: 2023-08-07
Publication date: 2024-02-15
Also published as: JP2024025472A

Abstract

The objective of the present invention is to provide an air cleaner in which sound attenuation measures are taken with respect to sound having a frequency band that changes due to propagation of the sound within a casing. In an air cleaner (100), a first silencer (20) is provided separately from a casing (40), and is disposed such that an interior space (21) of the first silencer (20) is in contact with a first space (24) on a downstream side of a tongue portion (13c) in an airflow generated by a blower (15). As a result, it is also possible to reduce sound having a frequency band that changes due to propagation of the sound within the casing (40).

Description

Air cleaner

The present invention relates to an air cleaner.

The air cleaner disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 9-229408) has a sound deadening material attached to the inner surface of the casing to take measures for sound deadening along the air flow path inside the casing.

However, in the configuration of the air purifier as described above, there are sound components that cannot be completely muffled due to sound propagation in the air flow path and changes in frequency components, and these sound components propagate outside the machine.

Therefore, there is a problem of providing an air purifier that takes measures to muffle the sound whose frequency band changes due to sound propagation within the casing.

The air cleaner of the first aspect is an air cleaner that blows purified air upward, and includes a blower, a first silencer, a filter, and a casing. The blower has an impeller and a housing that houses the impeller. The first silencer reduces noise generated due to driving of the blower. Filters clean the air. The casing has a blower, a first silencer, and a filter arranged therein. The first silencer is provided separately from the casing. The housing is formed with an inlet, an outlet, and a tongue located between the inlet and the outlet. The internal space of the first silencer is arranged so as to be in contact with the first space on the downstream side of the tongue in the air flow generated by the blower.

In this air cleaner, the first silencer 20 is provided separately from the casing 40, and its internal space is arranged so as to be in contact with the first space on the downstream side of the tongue in the air flow generated by the blower. As a result, the sound whose frequency band changes due to sound propagating inside the casing 40 is also suppressed.

The air cleaner of the second aspect is the air cleaner of the first aspect, in which the first silencer is arranged downstream of the outlet in the air flow.

In this air purifier, the sound can be muffled before the air flows into the air flow path formed outside the housing and inside the casing, so the sound muffling effect is further enhanced.

The air purifier according to the third aspect is the air purifier according to the first aspect or the second aspect, in which the air flowing through the peripheral part and the inside of the first silencer among the central part and peripheral part of the first space in a plan view. Contact with space.

In this air purifier, the internal space of the first silencer is arranged so as to be in contact with the air flowing in the peripheral portion of the first space, so that the air flow is not obstructed and a silencing effect can be obtained.

The air purifier according to the fourth aspect is the air purifier according to any one of the first to third aspects, and the air flowing through the central portion of the central portion and the peripheral portion of the first space in plan view is the air purifier according to any one of the first to third aspects. 1 Do not hit the silencer.

In this air purifier, sound is reduced by canceling out sound waves through reflection and resonance.

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 outlet of the housing in the air flow and is adjacent to the housing. are doing.

In this air purifier, the position of the first silencer is the closest to the sound source as can reasonably be installed, and therefore the silencing effect is enhanced.

The air cleaner according to the sixth aspect is any one of the air cleaners according to the first to fifth aspects, and the internal space of the first silencer is a sound deadening space. The height of the housing is greater than the height of the first silencer.

This air purifier can absorb sound energy by using the internal space, increasing the sound deadening effect.

The air cleaner according to the seventh aspect is the air cleaner according to any one of the first to sixth aspects, in which the first silencer is an annular member forming a section of an air flow path. The section is formed in a funnel shape so that the passage area increases in the direction of air flow. In this air cleaner, air passing through the first silencer is widely guided to the filter.

The air cleaner according to the eighth aspect is the air cleaner according to any one of the first to seventh aspects, and further includes an active species generation unit that generates active species. The active species generating section releases active species to the upstream side of the first silencer in the air flow.

In this air cleaner, the inside of the first silencer is purified by active species, so the generation of foreign odors, viruses, etc. is suppressed.

The air cleaner according to the ninth aspect is the air cleaner according to any one of the first to eighth aspects, and further includes a humidification unit that discharges humidified air. The first silencer 20 is arranged upstream of the humidification unit in the air flow.

In this air cleaner, humidified air does not flow into the first silencer, so the inside of the first silencer is prevented from becoming a humid environment.

The air cleaner according to the tenth aspect is the air cleaner according to any one of the first to ninth aspects, in which the filter is disposed downstream of the first silencer in the air flow. In plan view, the first silencer and the filter overlap.

In this air cleaner, moisture generated within the casing is prevented from dripping onto the first silencer.

The air cleaner according to the eleventh aspect is the air cleaner according to any one of the first to tenth aspects, and further includes a second silencer that reduces noise generated due to driving of the blower. The second silencer is arranged near the suction port of the housing. This air purifier reduces the sound emitted from the suction port.

The air cleaner according to the twelfth aspect is the air cleaner according to the eleventh aspect, in which the second silencer is located upstream of the inlet of the housing in the air flow and adjacent to the housing.

This air purifier reduces the ventilation noise of the air flowing into the suction port and the "wind noise when the impeller draws in air" radiated toward the suction port.

The air cleaner of the 13th aspect is the air cleaner of the 11th or 12th aspect, and the internal space of the second silencer is in contact with the second space. The second space is an air flow space before being sucked into the impeller of the blower.

The air cleaner according to the fourteenth aspect is the air cleaner according to any one of the first to thirteenth aspects, and further includes a third silencer that reduces noise generated due to driving of the blower. The internal space of the third silencer contacts the third space, which is the airflow space after exiting the impeller.

This air purifier reduces the "wind noise when the impeller draws in air" that is radiated to the downstream side of the impeller.

The air purifier according to the fifteenth aspect is the air purifier according to any one of the eleventh to fourteenth aspects, and the blower is a sirocco fan having two suction ports. A second silencer is arranged near both suction ports. This air purifier reduces the sound emitted from the two suction ports.

It is a perspective view of the air cleaner concerning this embodiment. FIG. 2 is a cross-sectional view of the air cleaner of FIG. 1 taken along a vertical plane that includes the rotation axis of the blower. 3 is a partial cross-sectional view of the air cleaner taken along line BB in FIG. 2. FIG. FIG. 3 is a view of the blower viewed from the rotation axis direction with the grill and prefilter of FIG. 2 removed. 4 is a cross-sectional view of the air cleaner taken along line CC in FIG. 3. FIG. It is an external perspective view of a 1st silencer. It is a perspective view of the 1st silencer which does not have a cavity and has only a hole. It is a perspective view of the 1st silencer molded with foamed resin. FIG. 6B is a perspective view of the first silencer in which one of the four inner surfaces of FIG. 6A is inclined upward and outward. It is an external perspective view of a 2nd silencer. It is a perspective view of the 2nd silencer which does not have a cavity, but has only a hole. It is a perspective view of the 2nd silencer molded with foamed resin. FIG. 7B is a perspective view of the second silencer in which the upstream end of the inner surface of FIG. 7A is inclined outward. It is a partial sectional view of the air cleaner concerning the 1st modification. It is a perspective view of the 1st silencer in the air cleaner concerning the 2nd modification. It is a perspective view of the 1st silencer in the air cleaner concerning the 3rd modification. It is a perspective view of the 2nd silencer in the air cleaner concerning the 4th modification.

(1) Overall configuration of air cleaner 100 FIG. 1 is a perspective view of air cleaner 100 according to this embodiment. In FIG. 1, an air cleaner 100 sucks air through a suction opening 100a on the side and blows out purified air through an outlet opening 100b on the top.

FIG. 2 is a cross-sectional view of the air cleaner 100 in FIG. 1 taken along a vertical plane that includes the rotation axis of the blower 15. In FIG. 2, inside the air cleaner 100, a blower 15, a filter 25, and a humidifying unit 35 are arranged in this order from the bottom.

The air cleaner 100 has a humidification function and an air purification function, and the user can select only the air purification function, but when the humidification function is selected, the air purification function is also included.

(2) Detailed configuration (2-1) Casing 40
As shown in FIG. 1, the casing 40 forms the outer shell of the air cleaner 100 in the shape of a square prism.

Moreover, as shown in FIG. 2, the casing 40 has a ventilation chamber 40a, an air purification chamber 40b, and a humidification chamber 40c. They are lined up in this order.

A blower 15 is arranged in the blower chamber 40a. An air cleaning filter 25 is arranged in the air cleaning chamber 40b. A humidifying unit 35 is arranged in the humidifying chamber 40c.

Furthermore, a first space 24 is provided between the ventilation chamber 40a and the air cleaning chamber 40b. The first space 24 also includes a part of the internal space of the blower 15, and allows air to pass to the air cleaning chamber 40b.

(2-2) Air blower 15
The blower 15 is a sirocco fan and includes an impeller 11, a fan motor 12, and a housing 13.

FIG. 3 is a partial cross-sectional view of the air cleaner 100 taken along line BB in FIG. 2. Further, FIG. 4 is a diagram of the blower 15 viewed from the rotation axis direction with the grill 90 and pre-filter 80 of the suction opening 100a of FIG. 2 removed.

In FIGS. 3 and 4, the impeller 11 has a hub 11a and a plurality of blades 11b arranged in a cylindrical shape around the periphery of the hub 11a. The impeller 11 is housed in a housing 13.

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

The tongue portion 13c protrudes toward the inside of the housing 13, and its protruding end is close to the impeller 11. The scroll 13d extends from the tongue portion 13c so as to circumferentially surround the impeller 11, and forms a guide path that guides air to the diffuser 13e.

The diffuser 13e guides the air guided by the scroll 13d to the air outlet 13b.

When the impeller 11 is driven and rotated by the fan motor 12, air is sucked in from the suction port 13a along the rotation axis direction and blown out from the blades 11b in the centrifugal direction. The air blown out in the centrifugal direction from the blades 11b travels along the scroll 13d of the housing 13, passes through the diffuser 13e, and is blown out from the air outlet 13b. The blown air enters the air cleaning chamber 40b.

(2-3) Filter 25
Filter 25 is arranged in air cleaning chamber 40b. The filter 25 is disposed downstream of the blower 15 and upstream of the humidification unit 35 in the air flow direction.

The filter 25 cleans the air by removing dust contained in the air sucked into the air cleaner 100 and removing odor-causing components. Therefore, the filter 25 includes a dust collecting filter 25a and a deodorizing filter 25b. The dust filter 25a removes dust contained in the air. The deodorizing filter 25b removes odor-causing components contained in the air. The deodorizing filter 25b is arranged on the downstream side in the air flow direction with respect to the dust collecting filter 25a.

(2-4) Active species generation unit 30
The active species generating section 30 is arranged between the suction opening 100a of the casing 40 and the housing 13 of the blower 15, as shown in FIG. The active species generation 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 cleaner 100, the inside of the first silencer 20 is purified by the active species, so generation of foreign odors, viruses, etc. is suppressed.

(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 downstream of the filter 25 in the air flow direction.

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

The element 353 is rotated by a motor 354, and the peripheral edge of the element 353 passes through the water stored in the tray 352. The air is humidified by vaporizing water from the water-containing element 353. Water in the tray 352 is supplied from the tank 351.

The tank 351, tray 352, and element 353 are removable from the humidification chamber 40c of the casing 40.

(2-6) First silencer 20
The first silencer 20 reduces noise generated due to driving of the blower 15. As shown in FIG. 3, the first silencer 20 is provided separately from the casing 40, and is located downstream of the outlet 13b in the air flow generated by the blower 15.

Here, "provided separately from the casing 40" means that the first silencer 20 is not used as a part of the casing 40.

FIG. 5 is a sectional view of the air cleaner 100 taken along line CC in FIG. 3. Moreover, FIG. 6A is an external perspective view of the first silencer 20. In FIGS. 5 and 6A, 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.

(2-6-1) Resonance Type Here, the resonance type first silencer 20 will be described. A plurality of holes 21a are formed in the inner surface 211 of the first silencer 20. Further, a cavity 21b is formed inside the first silencer 20.

The hole 21a and the cavity 21b are connected, and the interior space 21 includes the hole 21a and the cavity 21b. The interior space 21 is a Helmholtz resonance type space. However, the internal space 21 is not limited to the Helmholtz resonance type, but may be a muffler type or a side branch type space. A sound absorbing material such as glass wool or urethane foam may be placed in the internal space 21 .

Further, as shown in FIG. 3, in this embodiment, the first space 24 exists downstream of the tongue portion 13c of the housing 13 and upstream of the filter 25. The first space 24 is a space on the downstream side of the tongue portion 13c before the air blown out from the outlet 13b flows into the air flow path formed inside the casing 40.

It is preferable that the height of the housing 13 is greater than that of the first silencer 20, and that the height from the tongue portion 13c of the housing 13 to the outlet 13b is greater than the height of the first silencer 20.

The internal space 21 of the first silencer 20 is arranged so as to be in contact with the first space 24. Here, "the interior space 21 is in contact with the first space 24" means that the interior space 21 is open to the first space 24. The first silencer 20 does not need to be in close contact with the periphery of the air outlet 13b, and is arranged so as not to obstruct the air flow in the first space 24.

The blower 15 generates air suction noise generated by the rotation of the impeller 11, wind noise when the impeller 11 draws in air, and air generated when the air blown out in the centrifugal direction from the impeller 11 passes through the scroll 13d. Ventilation noise etc. propagate through the air.

When sound hits the inner surface 211 of the first silencer 20, the air in the hole 21a vibrates near the resonance frequency, and the sound energy is converted into thermal energy by friction with the surroundings, so the sound becomes smaller.

(2-6-2) Perforated board type It is also possible to apply a perforated board type first silencer 20 having only the holes 21a, as shown in FIG. 6B. In this case, the hole 21a becomes the internal space 21.

In FIG. 6B, even if the configuration includes only the holes 21a, the sound is absorbed by the holes 21a of the first silencer 20, and the sound energy is converted into thermal energy by friction with the vibration of the air, so that echoes are suppressed. Ru.

(2-6-3) Porous type In addition, although the holes 21a of the first silencer 20 shown in FIGS. 6A and 6 are holes of a visible size, the structure is not limited to such a structure. .

For example, it is also possible to apply a porous type first silencer 20. FIG. 6C is a perspective view of the first silencer 20 molded from foamed resin. In FIG. 6C, since the first silencer 20 is molded from foamed resin, there are countless invisible holes on the surface and air bubbles inside the holes. Even with this structure, sound enters the bubbles through the numerous holes and the sound energy is converted into thermal energy, reducing the sound.

(2-6-4) Other shapes The first silencer 20 shown in FIGS. 6A, 6B, and 6C has a shape in which the four inner surfaces 211 stand vertically, but the shape is not limited to this. FIG. 6D is a perspective view of the first silencer 20 in which one of the four inner surfaces 211 of FIG. 6A is inclined upward and outward.

In FIG. 6D, the section surrounded by the four inner surfaces 211 of the first silencer 20 forms a section of the air flow passage. Therefore, by forming at least one inner surface 211 to be inclined outwardly toward the upstream side of the air flow, the section becomes funnel-shaped and the passage area increases in the direction of the air flow.

The first silencer 20 shown in FIG. 3 employs the first silencer 20 shown in FIG. 6D, and the inclination angle of the inner surface 211 is matched to the inclination angle of the diffuser 13e on the tongue portion 13c side. Therefore, the air that has passed through the tongue portion 13c side flows smoothly from the diffuser 13e to the inner surface 211 of the first silencer 20.

Since the filter 25 is arranged downstream of the first silencer 20 in the air flow, the section surrounded by the inner surface 211 is formed so that the passage area increases in the direction of the air flow. Air passing through the first silencer 20 is widely guided to the filter 25.

(2-7) Second silencer 50
As shown in FIG. 4, the second silencer 50 is arranged so as to surround the bell mouth 13f along the outer periphery of the bell mouth 13f. The second silencer 50 reduces sounds radiated toward the suction port 13a, such as air suction noise generated by the rotation of the impeller 11 and wind noise when the impeller 11 draws in air.

(2-7-1) Resonance type Here, the resonance type second silencer 50 will be explained. FIG. 7A is an external perspective view of the second silencer 50. In FIG. 7A, a plurality of holes 51a are formed in the inner peripheral surface 511 of the second silencer 50. Further, a cavity 51b is formed inside the second silencer 50.

The hole 51a and the cavity 51b are connected, and the interior space 51 includes the hole 51a and the cavity 51b. The internal space 51 is a Helmholtz resonance type space. However, the internal space 51 is not limited to the Helmholtz resonance type, but may be a muffler type or a side branch type space. A sound absorbing material such as glass wool or urethane foam may be arranged in the internal space 51.

Further, in this embodiment, as shown in FIG. 2, the air flow space before being sucked into the impeller 11 of the blower 15 is the second space 52, and the internal space 51 of the second silencer 50 is the second space 52. are placed in contact with each other.

Here, "the interior space 51 is in contact with the second space 52" means that the interior space 51 is open to the second space 52.

From the blower 15, air suction noise generated by the rotation of the impeller 11, wind noise when the impeller 11 draws in air, etc. are radiated toward the suction port 13a.

When the sound hits the inner circumferential surface 511 of the second silencer 50, the air in the hole 51a vibrates near the resonance frequency, and the sound energy is converted into thermal energy by friction with the surroundings, so the sound becomes smaller.

(2-7-2) Perforated board type It is also possible to apply a perforated board type second silencer 50 having only the holes 51a, as shown in FIG. 7B. In this case, the hole 51a becomes the internal space 51.

In FIG. 7B, even if the configuration includes only the holes 51a, the sound is absorbed by the holes 51a of the second silencer 50, and the sound energy is converted into thermal energy by friction with the vibration of the air, so that echoes are suppressed. Ru.

(2-7-3) Porous type Furthermore, although the hole 51a of the second silencer 50 shown in FIGS. 7A and 7B is a hole of a visible size, it is not limited to such a configuration. .

For example, it is also possible to apply a porous type second silencer 50. FIG. 7C is a perspective view of the second silencer 50 molded from foamed resin. In FIG. 7C, since the second silencer 50 is molded from a foamed resin, there are countless invisible holes on the surface and air bubbles inside the holes. Even with this structure, sound enters the bubbles through the numerous holes and the sound energy is converted into thermal energy, reducing the sound.

(2-7-4) Other shapes The second silencer 50 shown in FIGS. 7A, 7B, and 7C has a shape in which the inner peripheral surface 511 stands vertically, but the shape is not limited to this. FIG. 7D is a perspective view of the second silencer 50 in which the upstream end of the inner circumferential surface 511 of FIG. 7A is inclined outward.

In FIG. 7D, the section surrounded by the inner circumferential surface 511 of the second silencer 50 forms one section of the airflow passage. Therefore, by forming the upstream end of the inner circumferential surface 511 to be inclined outward, the section becomes funnel-shaped, and the passage area gradually decreases in the direction of air flow. Thereby, the sound generated by the upstream end (edge) of the inner circumferential surface 511 of the second silencer 50 during air intake can be suppressed.

(3) Operation of Air Purifier 100 and Air Flow In FIGS. 2, 3, and 4, when power is turned on to air purifier 100, fan motor 12 of blower 15 rotates impeller 11. Since the impeller 11 blows out air in a centrifugal direction, the pressure around the rotation axis of the impeller 11 decreases, and air is sucked into the suction port 13a located at the center of the impeller 11. As a result, air flows from the suction port 13a toward the center of the impeller 11.

Relatively large dust particles are removed by a pre-filter 80 placed in front of the suction port 13a.

As shown in FIG. 4, the second silencer 50 is arranged so as to surround the bell mouth 13f. The sound radiated toward the suction port 13a, such as wind noise when being drawn in, is reduced.

The air blown out in the centrifugal direction from the impeller 11 is guided to the diffuser 13e by the scroll 13d, and is blown out into the first space 24 from the air outlet 13b. As shown in FIG. 3, the first silencer 20 is arranged to surround the outlet 13b, and the internal space 21 of the first silencer 20 is in contact with the first space 24.

Therefore, since the air flowing around the peripheral portion of the first space 24 flows in contact with the internal space 21 of the first silencer 20, the air flow is not obstructed, and the sound silencing effect is achieved by canceling the sound waves due to reflection and resonance. do.

The air blown into the first space 24 passes through the dust filter 25a to remove dust contained in the air.

The air that has passed through the dust collection filter 25a passes through the deodorizing filter 25b, thereby removing components that cause odor.

In FIG. 2, the air that has passed through the filter 25 is guided to the element 353 of the humidification unit 35. When the humidification function of the air cleaner 100 is on, the element 353 is rotated by the motor 354. The element 353 is arranged in the tray 352 so that the lower part of the element 353 is immersed in water, so as the element 353 rotates, the part newly immersed in water absorbs water from the tray 352. The air passing through the element 353 promotes vaporization of water that has permeated the element 353. As a result, the air becomes humidified air.

The humidified air that has passed through the element 353 becomes a vertical upward air flow and is blown out from the blow-off opening 100b.

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

(4) Features (4-1)
In the air cleaner 100, the first silencer 20 is provided separately from the casing 40, and its internal space 21 is arranged so as to be in contact with the first space 24 on the downstream side of the tongue portion 13c in the air flow generated by the blower 15. There is. As a result, the sound whose frequency band changes due to sound propagation within the casing 40 is also suppressed.

(4-2)
In the air cleaner 100, the first silencer 20 is disposed on the downstream side of the air outlet 13b in the air flow, so before the air flows to the air flow path formed outside the housing 13 and inside the casing 40. Can be muted.

(4-3)
In the air cleaner 100, the internal space 21 of the first silencer 20 is arranged so as to be in contact with the air flowing in the peripheral portion of the first space 24, so that a sound deadening effect can be obtained without obstructing the air flow.

(4-4)
In the air cleaner 100, the air flowing through the central portion of the central portion and the peripheral portion of the first space 24 in plan view does not hit the first silencer 20. In addition, sound is reduced by canceling sound waves through reflection and resonance.

(4-5)
In the air cleaner 100, the first silencer 20 is located downstream of the air outlet 13b of the housing 13 in the air flow, and is adjacent to the housing 13. The position of the first silencer 20 is the closest position to the sound source that can reasonably be installed, and therefore the silencing effect is enhanced.

(4-6)
In the air cleaner 100, the internal space 21 of the first silencer 20 is a silencing space, and is any one of a muffler type, a side branch type, and a Helmholtz resonance type. The internal space 21 may include a sound absorbing material. Since the internal space 21 can absorb sound energy, the silencing effect is enhanced.

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

(4-8)
The air cleaner 100 includes an active species generation unit 30 that generates active species, and the active species generation unit 30 releases the active species upstream of the first silencer 20 in the air flow, thereby generating the first silencer 20. The inside of the machine is purified, and the occurrence of strange odors and viruses is suppressed.

(4-9)
In the air cleaner 100, the first silencer 20 is arranged upstream of the humidification unit 35 in the air flow, and since humidified air does not flow into the first silencer 20, the inside of the first silencer 20 is in a humid environment. This will be suppressed.

(4-10)
In the air cleaner 100, the filter 25 is arranged downstream of the first silencer 20 in the air flow. In plan view, since the first silencer 20 and the filter 25 overlap, moisture generated within the casing 40 is prevented from dripping onto the first silencer 20.

(4-11)
In the air cleaner 100, the second silencer 50 is arranged near the suction port 13a of the housing 13, and the sound emitted from the suction port 13a is reduced.

(4-12)
In the air cleaner 100, the second silencer 50 is located upstream of the suction port 13a of the housing 13 in the air flow, is adjacent to the housing 13, and suppresses the ventilation sound of the air flowing to the suction port 13a and the suction port 13a. ``Wind noise when the impeller draws in air'' radiated to the side is reduced.

(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 an air flow space before being sucked into the impeller 11 of the blower 15.

(5) Modification (5-1) First modification FIG. 8 is a partial sectional view of an air cleaner 100 according to a first modification. In FIG. 8, the air cleaner 100 further includes a third silencer 60 different from the second silencer 50 in order to reduce noise generated due to driving of the blower 15.

In the first modification, the internal space 61 of the third silencer 60 contacts the third space 63, which is the air flow space after exiting the impeller 11.

In the first modification, "wind noise when the impeller 11 draws in air" radiated to the downstream side of the impeller 11 is reduced.

(5-2) Second Modification Example FIG. 9 is a perspective view of the first silencer 20 in the air cleaner 100 according to the second modification example. In FIG. 9, the first silencer 20 has a shape in which two square ring-shaped silencers are adjacent to each other on the left and right. Due to its shape, the effective volume of the first silencer 20 is increased. As a result, the silencing effect is further enhanced.

(5-3) Third Modification Example FIG. 10 is a perspective view of the first silencer 20 in an air cleaner 100 according to a third modification example. 10, the difference from the first silencer shown in FIG. 6A is that four inner surfaces 211 are removed. As a result, the cavity 21b becomes the internal space 21, which exhibits a noise reduction effect by canceling out sound waves due to reflection and resonance. However, a portion of the inner surface 211 may remain.

(5-4) Fourth Modification FIG. 11 is a perspective view of the second silencer 50 in the air cleaner 100 according to the fourth modification. 11, the difference from the second silencer shown in FIG. 7A is that the inner circumferential surface 511 is removed. As a result, the cavity 51b becomes the internal space 51, and exhibits a noise reduction effect by canceling out sound waves due to reflection and resonance. However, a portion of the inner circumferential surface 511 may remain.

Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure as described in the claims.

In this embodiment and each modification, air is sucked in from both suction ports of the sirocco fan and blown upward through a dust collection filter and a deodorizing filter located downstream of the air outlet of the sirocco fan, which is a so-called tower type. This was explained using an air purifier as an example.

However, the present disclosure is not limited to the tower-type air cleaner as described above. For example, a dust collection filter and a deodorizing filter are placed upstream of the suction port on one side of the sirocco fan, and air is sucked in from the suction port on one side of the scirocco fan after passing through the dust collection filter and the deodorization filter, and is blown upward from the air outlet. The present disclosure is also applicable to so-called trunk-type air cleaners.

11 Impeller 13 Housing

13a Suction port

13b Outlet port

13c Tongue portion 15 Blower 20 First silencer 21 Internal space 24 First space 25 Filter 30 Active species generation section 35 Humidification unit 40 Casing 50 Second silencer 51 Internal space 52 Second space 60 Third silencer 61 Internal space 63 Third space 100 Air cleaner

Published Japanese Patent Application Publication No. 9-229408

Claims

An air purifier that blows out purified air,
a blower (15) having an impeller (11) and a housing (13) that accommodates the impeller (11);
a first silencer (20) that reduces noise generated due to driving of the blower (15);
a filter (25) that purifies the air;
a casing (40) in which the blower (15), the first silencer (20) and the filter (25) are arranged;
Equipped with
The first silencer (20) is provided separately from the casing (40),
The housing (13) is formed with an inlet (13a), an outlet (13b), and a tongue (13c) located between the inlet (13a) and the outlet (13b). ,
The internal space (21) of the first silencer (20) is arranged so as to be in contact with the first space (24) on the downstream side of the tongue (13c) in the air flow generated by the blower (15). ,
Air purifier (100).
The first silencer (20) is arranged downstream of the air outlet (13b) in the air flow.
An air cleaner (100) according to claim 1.
Of the central portion and peripheral portion of the first space (24) in plan view, the air flowing through the peripheral portion contacts the internal space (21) of the first silencer (20);
The air cleaner (100) according to claim 1 or claim 2.
Among the central portion and peripheral portion of the first space (24) in plan view, air flowing through the central portion does not hit the first silencer (20);
The air cleaner (100) according to any one of claims 1 to 3.
The first silencer (20) is located downstream of the air outlet (13b) of the housing (13) in the air flow and is adjacent to the housing (13).
The air cleaner (100) according to any one of claims 1 to 4.
The internal space (21) of the first silencer (20) is a silencing space,
The height dimension of the housing (13) is greater than the height dimension of the first silencer (20).
The air cleaner (100) according to any one of claims 1 to 5.
The first silencer (20) is an annular member forming a section of the air flow passage,
The section is formed in a funnel shape so that the passage area increases in the direction of the air flow.
An air cleaner (100) according to any one of claims 1 to 6.
further comprising an active species generation unit (30) that generates active species,
The active species generation unit (30) releases the active species to the upstream side of the first silencer (20) in the air flow.
An air cleaner (100) according to any one of claims 1 to 7.
further comprising a humidification unit (35) that releases humidified air,
The first silencer (20) is arranged upstream of the humidification unit (35) in the air flow.
An air cleaner (100) according to any one of claims 1 to 8.
The filter (25) is arranged downstream of the first silencer (20) in the air flow,
In plan view, the first silencer (20) and the filter (25) overlap,
An air cleaner (100) according to any one of claims 1 to 9.
Further comprising a second silencer (50) that reduces noise generated due to driving of the blower (15),
The second silencer (50) is arranged near the suction port (13a) of the housing (13).
The air cleaner (100) according to any one of claims 1 to 10.
The second silencer (50) is located upstream of the inlet (13a) of the housing (13) in the air flow and is adjacent to the housing (13).
The air cleaner (100) according to claim 11.
The internal space (51) of the second silencer (50) contacts a second space (52) that is an air flow space before being sucked into the impeller (11) of the blower (15).
The air cleaner (100) according to claim 11 or 12.
Further comprising a third silencer (60) that reduces noise generated due to driving of the blower (15),
The internal space (61) of the third silencer (60) contacts the third space (63), which is the air flow space after exiting the impeller (11).
An air cleaner (100) according to any one of claims 1 to 13.
The blower (15) is a sirocco fan having two suction ports (13a),
The second silencer (50) is arranged near both the suction ports (13a),
The air cleaner (100) according to any one of claims 11 to 14.