WO2021106296A1 - Silencer and home appliance using said silencer - Google Patents

Abstract

This silencer (201) comprises a trunk part (210) that incorporates a plurality of sound tubes (202) each having a hollow inside thereof. In the central section of the trunk part, an opening section (211) for passing a housing (101a) of a motor (101) is formed. The sound tubes each have one open end section (A1) and the other closed end section (A2), and are arranged such that the one end section is oriented toward the opening section, and the other end section is oriented toward the outer circumferential surface of the trunk part.

Description

A silencer and home appliances equipped with the silencer

The present invention relates to a muffler and a home electric appliance provided with the muffler.

In mechanical devices, silencers are widely used as a means of reducing noise generated in drive parts such as motors. A silencer is a device that reduces noise propagation by utilizing sound absorption, reflection, interference, and the like. Silencers are classified into several types based on the muffling principle, and the expansion type, interference type, resonance type and the like are well known.

As a technique for using such a muffler in a home electric appliance, for example, there is one described in Patent Documents 1 and 2. These patent documents describe a configuration in which noise generated from a blower motor is reduced by attaching a resonance type silencer to a blower motor which is a noise source of a vacuum cleaner.

In the silencer described in Patent Document 1, a wall member surrounds the housing of the motor, a cavity (acoustic tube) for resonating sound waves is arranged outside the wall member, and sound waves radiated from the housing of the motor. Is configured to guide the inside of the cavity from the opening at the end of the wall member. On the other hand, in the silencer described in Patent Document 2, a wall member surrounds the housing of the motor, a cavity (acoustic tube) for resonating a sound wave is arranged outside the wall member, and the sound wave is radiated from the housing of the motor. The structure is such that the sound waves are guided from the holes provided in the wall member to the inside of the cavity.

Japanese Unexamined Patent Publication No. 2006-314595 Japanese Unexamined Patent Publication No. 07-031564

However, since the conventional resonance type silencer described in Patent Documents 1 and 2 has a wall member around the housing of the motor, the size of the entire silencer tends to be increased and it is difficult to reduce the size.

The present invention has been made to solve the above-mentioned problems, and provides a resonance type silencer that reduces noise generated by a motor while realizing miniaturization, and a home electric appliance provided with the silencer. The main purpose is to do.

In order to achieve the above object, the present invention is a silencer, which includes a body portion containing a plurality of acoustic tubes having a hollow inside, and an opening for passing a motor housing in a central portion of the body portion. A portion is formed, and each of the acoustic tubes has an open end portion and a closed other end portion, and the one end portion faces the direction of the opening portion, and the other end portion is formed. The portion is arranged so as to face the direction of the outer peripheral surface of the body portion.
Other means will be described later.

According to the present invention, it is possible to reduce the noise generated by the motor while realizing miniaturization.

It is a perspective view which shows the appearance of the washing machine as an example of the home electric appliances equipped with the silencer which concerns on Embodiment 1. FIG. It is a vertical cross-sectional view which shows the internal structure of the washing machine as an example of the home electric appliances equipped with the silencer which concerns on Embodiment 1. FIG. It is a vertical cross-sectional view which shows the configuration near the motor of a washing machine in an enlarged manner. It is a perspective view which shows the appearance of the silencer which concerns on Embodiment 1. FIG. It is a perspective view which shows the structure when the silencer which concerns on Embodiment 1 is attached to a motor. It is a vertical cross-sectional view which shows the structure when the silencer which concerns on Embodiment 1 is attached to a motor. FIG. 5 is a cross-sectional view showing a configuration when the silencer according to the first embodiment is attached to a motor. It is the schematic which shows the shape of the acoustic tube of the silencer which concerns on Embodiment 1. FIG. It is a waveform figure which shows the noise reduction effect by the silencer which concerns on Embodiment 1. It is sectional drawing which shows the structure of the silencer which concerns on Embodiment 2. It is sectional drawing which shows the structure of the silencer which concerns on Embodiment 3. FIG. It is a vertical sectional view which shows the structure of the silencer which concerns on Embodiment 4. FIG. It is a vertical sectional view which shows the structure of the silencer which concerns on Embodiment 5. It is a vertical sectional view which shows the structure of the silencer which concerns on Embodiment 6. It is sectional drawing which shows the structure of the acoustic tube on the upper stage side in the silencer which concerns on Embodiment 6. It is sectional drawing which shows the structure of the acoustic tube on the lower stage side in the silencer which concerns on Embodiment 6. It is a vertical sectional view which shows the structure of the silencer which concerns on Embodiment 7. It is a partial cross-sectional perspective view which shows the structure of the upper member of the silencer which concerns on Embodiment 7. It is a partial cross-sectional perspective view which shows the structure of the bottom member (bottom part) of the silencer which concerns on Embodiment 7. It is a cross-sectional view which shows the structure of the silencer which concerns on Embodiment 8. 9 is an enlarged vertical sectional view showing a configuration in the vicinity of a motor of a washing machine equipped with a silencer according to a ninth embodiment. It is a vertical cross-sectional view which shows the structure when the silencer which concerns on Embodiment 9 is attached to a motor. FIG. 5 is a cross-sectional view showing a configuration when the silencer according to the ninth embodiment is attached to a motor. It is a cross-sectional view which shows the structure when the silencer which concerns on 1st modification of Embodiment 9 is attached to a motor. FIG. 5 is a cross-sectional view showing a configuration when a silencer according to a second modification of the ninth embodiment is attached to a motor. FIG. 5 is a cross-sectional view showing a configuration when a silencer according to a third modification of the ninth embodiment is attached to a motor. It is a cross-sectional view which shows the structure when the silencer which concerns on 4th modification of Embodiment 9 is attached to a motor. It is a cross-sectional view which shows the structure when the silencer which concerns on 5th modification of Embodiment 9 is attached to a motor.

Hereinafter, embodiments of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. It should be noted that each figure is merely schematically shown to the extent that the present invention can be fully understood. Therefore, the present invention is not limited to the illustrated examples. Further, in each figure, common components and similar components are designated by the same reference numerals, and duplicate description thereof will be omitted.

[Embodiment 1]
<Composition of home appliances equipped with silencer>
Hereinafter, the configuration of the washing machine S as an example of the home electric appliance equipped with the silencer 201 (see FIG. 3) according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the appearance of a washing machine S as an example of a home electric appliance equipped with the silencer 201 according to the first embodiment. FIG. 2 is a vertical cross-sectional view showing an internal configuration of a washing machine S as an example of a home electric appliance equipped with a silencer 201. FIG. 3 is an enlarged vertical cross-sectional view showing the configuration of the washing machine S in the vicinity of the motor 101. Here, it is assumed that the washing machine S is a vertical washing machine dryer having a drying function.

As shown in FIGS. 1 and 2, the washing machine S includes an outer frame 1 as a housing, an outer tub 2 for storing washing water (see FIG. 2), a rotary tub 3 (see FIG. 2), and a drive motor 10 (see FIG. 2). (See FIG. 2), a blower 22 (see FIG. 2), and the like. The outer tub 2 is built in the outer frame 1 and is vibration-proof supported by the outer frame 1. The rotary tub 3 is a washing / dehydrating tub for accommodating laundry such as clothes to be washed and dried, and is provided inside the outer tub 2. The rotary tank 3 is rotatably supported inside the outer tank 2. At the bottom of the rotary tub 3, a stirring blade 4 for stirring and washing the laundry is rotatably provided. The stirring blade 4 is operated to repeat forward rotation and reverse rotation during the washing operation and the drying operation. During the dehydration operation, the stirring blade 4 rotates at high speed together with the rotary tub 3 to dehydrate the water contained in the laundry inside the rotary tub 3. The drive motor 10 is provided inside the outer frame 1 and drives the stirring blade 4 and the rotary tank 3 to rotate.

An outer lid 5 and a top cover 6 are provided on the upper part of the outer frame 1. A handle 5a (see FIG. 1) and an operation panel 54 are provided on the front side of the outer lid 5. The operation panel 54 is provided with an operation switch 52 (see FIG. 1) and a display 53 (see FIG. 1). The outer lid 5 is provided on the top cover 6 so as to be openable and closable. An inner lid 34 is provided on the upper portion of the outer tank 2 so as to be openable and closable. A power switch 51 is provided on the front surface of the top cover 6. The washing machine S can put in and take out laundry from the rotary tub 3 by opening the outer lid 5 and the inner lid 34. Inside the outer frame 1, a water supply unit 7 is provided on the back side of the top cover 6. The water supply unit 7 is provided with a water supply box (not shown) having a plurality of water channels inside, and supplies tap water or bath water flowing in from the water supply hose connection port 8 to the outer tank 2. Further, on the front side of the top cover 6, a detergent or finishing agent charging device 35 is provided. The detergent and finishing agent are poured between the outer tank 2 and the rotary tank 3 by the charging hose 36.

The washing machine S is provided with a drying mechanism 9 for drying the laundry inside the rotary tub 3. The drying mechanism 9 circulates and dehumidifies the drying air. The drying mechanism 9 has a blower 22 that sends drying air to the drying air circulation path. The drying mechanism 9 heats the drying air with the electric heater 24 of the blower 22 to dry it, and rotates the impeller 104 (see FIG. 3) of the blower 22 by the motor 101 to pass through the drying air circulation path. The drying air is sent to the inside of the rotary tank 3. As a result, the drying mechanism 9 dries the laundry inside the rotary tub 3. A fan or blower is attached to the shaft 102 (see FIG. 3) of the motor 101, if necessary.

The drying air circulation path of the drying mechanism 9 includes a bottom circulation path 20 connected so as to communicate with the bottom of the outer tank 2 and a dehumidifying vertical passage 21 extending upward from the bottom circulation path 20. The suction side of the blower 22 is connected to the upper side of the dehumidifying vertical passage 21. The discharge side of the blower 22 is connected so as to communicate with the return connection circulation path 25. Further, a drying filter 45 is arranged between the blower 22 and the dehumidifying vertical passage 21. The washing machine S uses a drying filter 45 to prevent foreign matter from flowing into the blower 22.

The return connection circulation path 25 has an upper bellows hose 23, and is connected so as to communicate with the upper part of the outer tank 2 via the upper bellows hose 23. The bottom circulation path 20 has a lower bellows hose 26, and is connected to the bottom of the outer tank 2 via the lower bellows hose 26. The lower bellows hose 26 is connected to the bottom drop portion 31 of the outer tank 2.

The bottom drop portion 31 communicates with the washing water drainage channel 42 and the washing water circulation water channel 43 via the lower communication pipe 41. A drain valve 44 is provided in the washing water drainage channel 42. A foreign matter removing trap 32 is provided in the washing water circulation water channel 43. The drain valve 44 is closed during the washing operation and the drying operation. On the other hand, the drain valve 44 opens when the washing water is drained, and the washing water and rinsing water accumulated in the outer tub 2 are discharged from the washing water drainage channel 42 to the outside (outside the machine) of the washing machine S. The washing water circulation water channel 43 is connected to the washing water circulation water vertical water channel 46. The washing water circulating water vertical channel 46 rises along the outer surface of the outer tub 2 and extends to the upper side of the rotary tub 3 and is connected so as to communicate with the washing thread waste removing device 33 provided on the upper side of the rotary tub 3. Will be done.

An air tube 49 and an air trap 50 are provided near the bottom of the outer tank 2. The air tube 49 is connected so as to communicate with the air trap 50. A water level sensor 47 is connected to the upper end of the air tube 49. The washing machine S detects the fluctuation of the water level inside the outer tub 2 with the water level sensor 47.

The washing machine S sprays and injects the washing water and rinse water accumulated in the outer tub 2 from the washing thread waste removing device 33 into the rotary tub 3 through the washing water circulating water vertical water channel 46 (that is, injects water so as to be sprayed). , Pour water into the rotary tank 3. At that time, the washing machine S detects the water level of the washing water and the rinsing water accumulated in the outer tub 2 with the water level sensor 47. The washing machine S performs washing and rinsing while spraying and injecting water. As a result, the washing machine S performs washing and rinsing with a small amount of water.

Further, in the washing machine S, for example, when the impeller 104 (see FIG. 3) of the blower 22 is rotated by the motor 101, noise such as electromagnetic noise is generated by the motor 101. The noise is mainly radiated to the outside from the side surface of the housing 101a (see FIGS. 3 and 5) of the motor 101. In the first embodiment, the washing machine S reduces noise by attaching a silencer 201 around the housing 101a (see FIGS. 3 and 5) of the motor 101. Hereinafter, this point will be described with reference to FIG. The silencer 201 has a resonance type structure.

As shown in FIG. 3, an impeller 104 (fan) is attached to the shaft 102 of the motor 101. The impeller 104 is covered with a fan casing 103. The fan casing 103 is provided with an intake port portion 105. The washing machine S sucks air from the intake port 105 and circulates the drying air in the drying air circulation path. The fan casing 103 is attached to the motor 101 via anti-vibration rubbers 106 and 107. A silencer 201 is attached around the housing 101a of the motor 101. The washing machine S reduces noise such as electromagnetic noise generated by the motor 101 by the silencer 201.

In the first embodiment, the washing machine S is provided with a gap between the silencer 201 and the motor 101. As a result, the washing machine S can block the vibration transmitted from the motor 101 to the silencer 201 side, although the sound insulation property is lowered. However, whether or not to provide this gap may be determined in consideration of the characteristics of noise generated by the motor 101, the characteristics of vibration, the material of the silencer 201, the cooling of the motor 101, and the like.

<Composition of silencer>
Hereinafter, the configuration of the silencer 201 will be described with reference to FIGS. 4 to 7. FIG. 4 is a perspective view showing the appearance of the silencer 201. FIG. 5 is a perspective view showing a configuration when the silencer 201 is attached to the motor 101. FIG. 6 is a vertical cross-sectional view showing a configuration when the silencer 201 is attached to the motor 101. FIG. 7 is a cross-sectional view showing a configuration when the silencer 201 is attached to the motor 101.

As shown in FIGS. 4 to 7, the silencer 201 includes a body portion 210 containing a plurality of acoustic tubes 202 having a hollow inside. An opening 211 for passing the housing 101a of the motor 101 is formed in the central portion of the body portion 210. The silencer 201 can be molded from a resin material.

As shown in FIG. 6, each acoustic tube 202 has an open one end A1 and a closed other end A2. Then, each acoustic tube 202 is orthogonal to the axial direction of the opening 211 so that one end A1 faces the direction of the opening 211 and the other end A2 faces the direction of the outer peripheral surface of the body 210. In FIG. 6, they are arranged in the left-right direction). As a result, a layer in which a plurality of acoustic tubes 202 are arranged on the same plane is formed inside the body portion 210. The axial direction of the opening 211 is the direction in which the housing 101a of the motor 101 is passed through the opening 211 (vertical direction in FIG. 6).

As shown in FIG. 7, the body portion 210 of the silencer 201 is formed in a disk shape when viewed from above. The opening 211 is formed in a circular shape at the center of the body 210 when viewed from above. Therefore, the body portion 210 of the silencer 201 has an annular shape when viewed from above. The inner diameter of the opening 211 is slightly larger than the diameter of the housing 101a of the motor 101. Each acoustic tube 202 is arranged radially around the center 211o of the opening (see FIG. 7). That is, each acoustic tube 202 is arranged so as to extend linearly in the normal direction with respect to the circular surface of the opening 211.

In such a silencer 201, when the silencer 201 is attached to the motor 101, a plurality of acoustic tubes 202 are arranged so as to surround the housing 101a of the motor 101. Then, the opened one end A1 (see FIG. 6) of each acoustic tube 202 is in a state of facing the direction of the housing 101a.

In such a silencer 201, sound waves radiated from the side surface of the housing 101a of the motor 101 enter the inside of the acoustic tube 202 from the opened one end A1 (see FIG. 6), and the acoustic tube 202 is closed. It is reflected at the other end A2 (see FIG. 6). At that time, the silencer 201 can be used to cancel the sound wave (reflected wave) reflected by the other end A2 to cancel the sound wave (incident wave) incident from the one end A1. Therefore, the silencer 201 can reduce the noise generated by the motor 101.

As shown in FIG. 8, the acoustic tube 202 has a depth length D, a width W, and a height H. FIG. 8 is a schematic view showing the shape of the acoustic tube 202. In FIG. 8, the diagonally upper right side of the acoustic tube 202 is the direction of the opening 211.

As shown in FIG. 8, in the present embodiment, the acoustic tube 202 has a rectangular parallelepiped shape. Such an acoustic tube 202 has a rectangular cross-sectional shape in the axial direction (vertical direction in FIG. 6) of the opening 211.

In the present embodiment, the depth length D of the acoustic tube 202 is set to be within the range of “(λ × 1/4) ± 10 (%)” with respect to the wavelength λ of the sound wave of the muffling target frequency. Is set to. That is, the depth length D of the acoustic tube 202 has the length of "(λ x 1/4)" as the center value and "(λ x 1/4) -10 (%)" as the lower limit value. (Λ × 1/4) + 10 (%) ”is set as the upper limit value. “± 10 (%)” is an allowable value when setting the depth length D.

In such a silencer 201, the reflected wave reflected by the other end A2 (see FIG. 6) is an incident wave (sound wave radiated from the motor 101) incident from the opened one end A1 (see FIG. 6). The phase (wavelength) with and is shifted by 1/2. Therefore, the reflected wave and the incident wave have opposite phases. Since such a silencer 201 can act so that the reflected wave and the incident wave cancel each other out, the incident wave (sound wave radiated from the motor 101) can be silenced. As a result, the silencer 201 can more efficiently reduce the noise generated by the motor 101.

The width W and height H of the acoustic tube 202 are set so that the sound wave of the frequency to be silenced inside the acoustic tube 202 becomes a plane wave (that is, a wave whose wavefront is on a plane perpendicular to the traveling direction of the wave). It should be done. Therefore, for example, the width W and the height H of the acoustic tube 202 are set to have a magnitude of (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the muffling target frequency, respectively. Good. The silencer 201 configured in this way can cancel (realize) a plane wave inside each acoustic tube 202 to cancel the noise. As a result, the silencer 201 can efficiently reduce the noise generated by the motor 101.

However, the shape of the acoustic tube 202 is determined according to constraints such as the size of the motor 101, the frequency for noise muffling (frequency in the band for muffling), and the space of the home appliance to which the motor 101 is attached. Will be done. Further, the number of acoustic tubes 202 is also determined according to constraints such as the size of the motor 101, the frequency for noise muffling, and the space of the home electric appliance to which the motor 101 is attached.

FIG. 9 is a waveform diagram showing the noise reduction effect of the silencer 201. The waveform diagram of FIG. 9 is obtained by rotationally driving the motor 101 to which the silencer 201 is attached and measuring the noise at that time. The horizontal axis of FIG. 9 indicates the frequency [Hz], and the vertical axis indicates the noise level [dBA]. Here, "dBA" is a unit representing the A-weighted sound pressure level. The "A characteristic" is a frequency weighting characteristic in consideration of human hearing, which is used for measurement by a sound level meter. According to the waveform diagram of FIG. 9, it is found that the muffler 201 reduces the noise near the muffling target frequency R.

In particular, the noise silencer 201 can further effectively cancel noise by being configured to establish (realize) a plane wave inside each acoustic tube 202. As a result, the silencer 201 can further efficiently reduce the noise generated by the motor 101.

When the axial length of the motor 101 is long, depending on the frequency for noise muffling, the axial length of the motor 101 (that is, the height of each layer composed of the plurality of acoustic tubes 202) may be increased. There is a possibility that a plane wave will not be established (realized). In this case, the silencer 201 can establish (realize) a plane wave in each layer by having a plurality of layers of the acoustic tube 202. In the present embodiment, the silencer 201 has a structure in which layers are laminated in two stages in the vertical direction. However, the number of layers (number of stages) of the acoustic tube 202 is not limited to two stages, and may be changed according to the size of the motor 101, the noise muffling target frequency, and the like.

The silencer 201 having a configuration having a plurality of layers of acoustic tubes 202 can reduce the noise generated by the motor 101 for each layer. Further, the silencer 201 having this configuration is a muffling target for each layer, such as the silencer 201C (see FIG. 12) according to the fourth embodiment described later and the silencer 201D (see FIG. 13) according to the fifth embodiment described later. Allows you to change the frequency.

As described above, in the first embodiment, the washing machine S is provided with a gap between the silencer 201 and the motor 101. That is, the silencer 201 provides a gap between the body portion 210 and the housing 101a of the motor 101. As a result, the silencer 201 can block the vibration transmitted from the motor 101.

Note that this gap may be filled with an anti-vibration member (not shown) made of a relatively soft material such as rubber or gel. That is, the silencer 201 may have a configuration in which a vibration isolator member (not shown) is arranged at one end A1 (see FIG. 6) of the acoustic tube 202 of the body portion 210. In such a silencer 201, the vibration isolator (not shown) can suppress the vibration transmitted from the motor 101, and the anti-vibration member (not shown) can improve the sound insulation. Therefore, the silencer 201 can reduce both the vibration and the noise generated by the motor 101.

<Main features of silencer>
(1) As shown in FIGS. 4 to 7, the silencer 201 according to the first embodiment includes a body portion 210 containing a plurality of acoustic tubes 202 having a hollow inside. An opening 211 for passing the housing 101a of the motor 101 is formed in the central portion of the body portion 210. Each acoustic tube 202 has an open one end A1 (see FIG. 6) and a closed other end A2 (see FIG. 6). Each of the acoustic tubes 202 is arranged so that one end A1 faces the direction of the opening 211 and the other end A2 faces the direction of the outer peripheral surface of the body 210.

In such a silencer 201 according to the first embodiment, when the silencer 201 is attached to the motor 101, a plurality of acoustic tubes 202 are arranged so as to surround the housing 101a of the motor 101. Then, the opened one end A1 (see FIG. 6) of each acoustic tube 202 is in a state of facing the direction of the housing 101a.

Such a silencer 201 is used to cancel the sound wave (reflected wave) reflected by the other end A2 (see FIG. 6) and the sound wave (incident wave) incident from the one end A1 (see FIG. 6). be able to. Therefore, the silencer 201 can reduce the noise generated by the motor 101. Moreover, the silencer 201 according to the first embodiment does not have a wall member around the housing of the motor, unlike the conventional resonance type silencer described in Patent Documents 1 and 2, for example. Therefore, the silencer 201 according to the first embodiment can be made smaller than the conventional resonance type silencer.

(2) As shown in FIG. 7, the body portion 210 of the silencer 201 according to the first embodiment is formed in a disk shape when viewed from above. The opening 211 is formed in a circular shape at the center of the body 210 when viewed from above. Each acoustic tube 202 is arranged radially around the center 211o of the opening (see FIG. 7).

In such a silencer 201 according to the first embodiment, when the silencer 201 is attached to the motor 101, a plurality of acoustic tubes 202 are arranged so as to radially surround the housing 101a of the motor 101. Therefore, the silencer 201 can efficiently guide the sound waves radiated from the housing 101a of the motor 101 to each acoustic tube 202. As a result, the silencer 201 can efficiently reduce the noise generated by the motor 101.

(3) Depth length D (see FIG. 8) which is the length from one end A1 (see FIG. 6) to the other end A2 (see FIG. 6) of each acoustic tube 202 of the silencer 201 according to the first embodiment. (See) is preferably a length within the range of (λ × 1/4) ± 10 (%) with respect to the wavelength λ of the sound wave of the muffling target frequency.

Such a silencer 201 according to the first embodiment is reflected by an incident wave (sound wave radiated from the motor 101) incident from one end A1 (see FIG. 6) and the other end A2 (see FIG. 6). The phase (wavelength) with the reflected wave can be shifted by 1/2. That is, the silencer 201 can make the reflected wave and the incident wave out of phase. Such a silencer 201 can act so that the reflected wave and the incident wave cancel each other out. As a result, the silencer 201 can mute the incident wave (sound wave radiated from the motor 101). As a result, the silencer 201 can more efficiently reduce the noise generated by the motor 101.

(4) As shown in FIG. 8, it is preferable that each acoustic tube 202 of the silencer 201 according to the first embodiment has a rectangular cross-sectional shape in the axial direction of the opening 211. The width W (see FIG. 8) of each acoustic tube 202 of the muffler 201 is preferably (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the muffling target frequency. Further, the height H (see FIG. 8) of each acoustic tube 202 of the silencer 201 is preferably (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the frequency to be silenced.

Such a muffler 201 according to the first embodiment can cancel (realize) a plane wave inside each acoustic tube 202 to cancel the noise. As a result, the silencer 201 can more efficiently reduce the noise generated by the motor 101.

(5) As shown in FIGS. 4 to 7, the body portion 210 of the silencer 201 according to the first embodiment has a plurality of layers in which a plurality of acoustic tubes 202 are arranged in the axial direction of the opening 211. It is good to have.

The silencer 201 according to the present embodiment can reduce the noise generated by the motor 101 for each layer. Further, the muffler 201 makes it possible to change the muffling target frequency for each layer.

(6) As shown in FIG. 6, the body portion 210 of the silencer 201 according to the first embodiment has the housing 101a of the motor 101 and the acoustic tube 202 when the housing 101a of the motor 101 is passed through the opening 211. One end portion A1 (see FIG. 6) may be separated from the one end portion A1 (see FIG. 6).

The silencer 201 according to the present embodiment can block the vibration transmitted from the motor 101 in the gap formed between the body portion 210 and the housing 101a of the motor 101.

(7) In the body 210 of the silencer 201 according to the first embodiment, a vibration isolator (not shown) may be arranged at one end A1 (see FIG. 6) of the acoustic tube 202.

In the silencer 201 according to the present embodiment, the vibration isolator (not shown) suppresses the vibration transmitted from the motor 101, and the anti-vibration member (not shown) can improve the sound insulation. Therefore, the silencer 201 can reduce both the vibration and the noise generated by the motor 101.

As described above, according to the silencer 201 according to the first embodiment, it is possible to reduce the noise generated by the motor 101 while realizing the miniaturization.

[Embodiment 2]
Hereinafter, the configuration of the silencer 201A according to the second embodiment will be described with reference to FIG. FIG. 10 is a cross-sectional view showing the configuration of the silencer 201A according to the second embodiment. FIG. 10 shows the configuration of the silencer 201A when it is not attached to the motor 101.

As shown in FIG. 10, in the silencer 201A according to the second embodiment, as compared with the silencer 201 (see FIG. 7) according to the first embodiment, the acoustic tube 202A is attached to the body portion 210 instead of the acoustic tube 202. It differs in that it is formed.

The acoustic tube 202A has a rectangular cross-sectional shape in the vertical direction (perpendicular to the paper surface), and is arranged so as to rotate linearly around the opening 211. That is, the acoustic tube 202A has a rectangular vertical cross-sectional shape, and is arranged so as to extend linearly in the clockwise direction or the counterclockwise direction (clockwise direction in the example shown in FIG. 10).

The silencer 201A according to the second embodiment has the outer diameter of the silencer 201A while maintaining the dimension of the central depth length L of the acoustic tube 202A (that is, without changing the frequency to be silenced). It can be made smaller. Therefore, the silencer 201A according to the second embodiment can be made smaller than the silencer 201 (see FIG. 7) according to the first embodiment.

The frequency to be muted is determined by the dimension of the depth length L at the center. Therefore, if the frequency is low, the depth length L of the central portion becomes long, and if the frequency is high, the depth length L of the central portion becomes short. Therefore, since the muffler 201A according to the second embodiment has the acoustic tube 202A, even if the same frequency as the muffler 201 according to the first embodiment is set as the muffling target frequency, the muffling according to the first embodiment is muffled. The overall shape of the silencer 201A can be made smaller than that of the device 201.

Further, in the silencer 201A according to the second embodiment, the depth length of each acoustic tube 202A is different between the inner wall surface 301a on one side and the inner wall surface 301b on the other side. The depth length L12 of the other side inner wall surface 301b is longer than the depth length L11 of the one side inner wall surface 301a. In such a silencer 201A, the frequency that can be silenced can be set to have a range by the difference between the depth length L12 and the depth length L11. That is, such a muffler 201A can widen the range of muffling target frequencies.

[Embodiment 3]
Hereinafter, the configuration of the silencer 201B according to the third embodiment will be described with reference to FIG. FIG. 11 is a cross-sectional view showing the configuration of the silencer 201B according to the third embodiment. FIG. 11 shows the configuration of the silencer 201B when it is not attached to the motor 101.

As shown in FIG. 11, in the silencer 201B according to the third embodiment, as compared with the silencer 201A (see FIG. 10) according to the second embodiment, the acoustic tube 202B is attached to the body portion 210 instead of the acoustic tube 202A. It differs in that it is formed.

The acoustic tube 202B has a rectangular cross-sectional shape in the vertical direction (perpendicular to the paper surface), and is arranged so as to swivel around the opening 211 in an arc shape. That is, the acoustic tube 202B has a rectangular vertical cross-sectional shape, and is arranged so as to be curved inward in an arc shape in the clockwise direction or the counterclockwise direction (clockwise direction in the example shown in FIG. 11). Has been done.

Like the silencer 201A according to the second embodiment, the silencer 201A according to the second embodiment keeps the dimension of the central depth length L of the acoustic tube 202B (that is, the frequency to be silenced is changed). The outer diameter of the silencer 201B can be reduced (without doing so). Therefore, the silencer 201B according to the third embodiment can be made smaller than the silencer 201 (see FIG. 7) according to the first embodiment, like the silencer 201A according to the second embodiment.

Moreover, in the silencer 201B according to the third embodiment, since the acoustic tube 202B is curved inward in an arc shape, the acoustic tube 202B is formed at a higher density than the silencer 201A according to the second embodiment. be able to. Therefore, the muffler 201B according to the third embodiment can improve the noise reduction performance as compared with the muffler 201A according to the second embodiment.

Further, in the silencer 201B according to the third embodiment, the depth length of each acoustic tube 202B is different between the inner wall surface 302a on one side and the inner wall surface 302b on the other side, similarly to the silencer 201A according to the second embodiment. .. The depth length L22 of the other side inner wall surface 302b is longer than the depth length L21 of the one side inner wall surface 302a. In such a silencer 201B, the frequency that can be silenced can be set to have a range by the difference between the depth length L22 and the depth length L21. That is, such a muffler 201B can widen the range of muffling target frequencies like the muffling device 201A according to the second embodiment.

Moreover, the acoustic tube 202B of the silencer 201B according to the third embodiment is curved inward in an arc shape and extends, and the closed other end A2 has a shape orthogonal to the extending direction of the acoustic tube 202B. There is. The acoustic tube 202B of the silencer 201B according to the third embodiment can increase the difference between the depth length L22 and the depth length L21 as compared with the acoustic tube 202A of the silencer 201A according to the second embodiment. .. Further, the depth length of the acoustic tube 202B of the silencer 201B according to the third embodiment asymptotically, that is, gradually increases (changes) from the inner wall surface 302a on one side to the inner wall surface 302b on the other side. ). As a result, the muffler 201B according to the third embodiment can have a wider range of frequencies that can be muffled than the muffler 201A according to the second embodiment, and the range of muffling target frequencies can be expanded.

The shape of the other end A2 of the acoustic tube 202B is not limited to the illustrated example. In the third embodiment, the other end A2 has a shape orthogonal to the extending direction of the acoustic tube 202B, but may be parallel to the surface of the opened one end A1. However, in this case, since the depth length of the acoustic tube 202B is the same as the depth length L of the central portion from the inner wall surface 302a on one side to the inner wall surface 302b on the other side, the present embodiment The band of the muffling target frequency of the muffler 201B according to No. 3 becomes a single band.

[Embodiment 4]
Hereinafter, the configuration of the silencer 201C according to the fourth embodiment will be described with reference to FIG. FIG. 12 is a vertical cross-sectional view showing the configuration of the silencer 201C according to the fourth embodiment.

As shown in FIG. 12, in the silencer 201C according to the fourth embodiment, the depth length of each acoustic tube 202C is lower than the upper inner wall surface 202Ca as compared with the silencer 201 (see FIG. 6) according to the first embodiment. It differs in that it differs from the inner wall surface 202Cb. In the fourth embodiment, the silencer 201D has two layers, an upper acoustic tube 202Da and a lower acoustic tube 202Db, and in each layer, the depth length of the lower inner wall surface 202Cb is higher. It is longer than the depth length of the wall surface 202Ca.

In the fourth embodiment, the other end A2 of the acoustic tube 202C is formed as a linear diagonally inclined surface in the vertical cross section. However, the other end A2 may be formed as, for example, a surface curved in an arc shape in a vertical cross section, or may be formed as a stepped surface.

The muffler 201C according to the fourth embodiment can reduce the noise generated by the motor 101 while realizing miniaturization, similarly to the muffler 201C according to the other embodiments. Moreover, in the silencer 201C according to the fourth embodiment, since the depth length of each acoustic tube 202C is different between the upper inner wall surface 202Ca and the lower inner wall surface 202Cb, it is possible to give a range to the frequencies that can be silenced. The range of frequencies to be muted can be expanded. The number of layers (number of stages) of the acoustic tube 202C is not limited to two stages, but is changed according to the size of the motor 101, the frequency for noise muffling (frequency of the band for muffling), and the like. You may.

[Embodiment 5]
Hereinafter, the configuration of the silencer 201D according to the fifth embodiment will be described with reference to FIG. FIG. 13 is a vertical cross-sectional view showing the configuration of the silencer 201D according to the fifth embodiment.

As shown in FIG. 13, in the silencer 201D according to the fifth embodiment, the depth length of each acoustic tube 202D is different depending on the layer as compared with the silencer 201 (see FIG. 6) according to the first embodiment. It differs in that. In the fifth embodiment, the silencer 201D has two layers of the acoustic tube 202Da and the acoustic tube 202Db, and the depth length of the acoustic tube 202D is longer than the depth length of the acoustic tube 202Db. There is.

In the fifth embodiment, the other end A2 of the acoustic tube 202D is formed as a linear surface arranged in the vertical direction in the vertical cross section. However, the other end portion A2 may be formed as a linear surface inclined in an oblique direction, for example, as in the silencer 201C according to the fourth embodiment. Further, the other end portion A2 may be formed as a surface curved in an arc shape in a vertical cross section, or may be formed as a stepped surface.

The muffler 201D according to the fifth embodiment can reduce the noise generated by the motor 101 while realizing miniaturization like the muffler 201D according to the other embodiments. Moreover, in the silencer 201D according to the fifth embodiment, since the depth length of each acoustic tube 202D is different depending on the layer, the frequency that can be silenced can be widened, and the range of the frequency to be silenced can be expanded. Can be done. The number of layers (number of stages) of the acoustic tube 202D is not limited to two stages, but is changed according to the size of the motor 101, the frequency for noise muffling (frequency of the band for muffling), and the like. You may.

[Embodiment 6]
Hereinafter, the configuration of the silencer 201E according to the sixth embodiment will be described with reference to FIGS. 14, 15A, and 15B. FIG. 14 is a vertical cross-sectional view showing the configuration of the silencer 201E according to the sixth embodiment. FIG. 15A is a cross-sectional view showing the configuration of the acoustic tube 202Ea on the upper stage side of the silencer 201E. FIG. 15B is a cross-sectional view showing the configuration of the acoustic tube 202Eb on the lower stage side of the silencer 201E.

As shown in FIGS. 14, 15A, and 15B, the silencer 201E according to the sixth embodiment is cooled to cool the motor 101 as compared with the silencer 201 according to the first embodiment (see FIG. 3). It differs in that it has a portion 206.

As shown in FIG. 14, in the sixth embodiment, the silencer 201E has a two-stage acoustic tube 202E having an upper acoustic tube 202Ea and a lower acoustic tube 202Eb, and has an upper acoustic tube 202E. The 202Ea has a cooling unit 206.

As shown in FIG. 15A, the cooling unit 206 has an acoustic pipe 202Ea, an intake port 203, an exhaust port 204, and a partition plate 205. The acoustic tube 202Ea is formed in a circular tubular shape so that when the silencer 201E is attached to the motor 101, it can surround the housing 101a of the motor 101. The acoustic tube 202Ea functions as a passage for passing air sucked from the intake port 203. The acoustic tube 202Ea is partitioned by a partition plate 205 into a space on the intake port 203 side and a space on the exhaust port 204 side.

The cooling unit 206 sucks in air for cooling the motor 101 from the intake port 203, passes it through the acoustic pipe 202Ea, and then exhausts it from the exhaust port 204. At that time, the cooling unit 206 cools the outer peripheral surface of the housing 101a of the motor 101 by passing air through the acoustic tube 202Ea.

As shown in FIG. 15B, the lower layer of the acoustic tube 202Eb has the same structure as the silencer 201 (see FIG. 7) of the first embodiment. Therefore, the description thereof is omitted here.

The silencer 201E according to the sixth embodiment can reduce the noise generated by the motor 101 while cooling the motor 101.

[Embodiment 7]
Hereinafter, the configuration of the silencer 201F according to the seventh embodiment will be described with reference to FIGS. 16, 17A, and 17B. FIG. 16 is a vertical cross-sectional view showing the configuration of the silencer 201F according to the seventh embodiment. FIG. 17A is a partial cross-sectional perspective view showing the configuration of the upper member 210a of the silencer 201F. FIG. 17B is a partial cross-sectional perspective view showing the configuration of the bottom member 210b (bottom portion) of the silencer 201F.

As shown in FIGS. 16, 17A, and 17B, the silencer 201F according to the seventh embodiment has a removable bottom portion (bottom member 210b) of the body portion 210 as compared with the silencer according to the other embodiments. It differs in that it has a similar structure.

As shown in FIG. 16, in the seventh embodiment, the body portion 210 of the silencer 201F is configured to be separable into an upper member 210a and a bottom member 210b. The cross-sectional shape of the silencer 201F in the lateral direction is the same as the shape of the silencer 201 shown in FIG. 7.

In the silencer 201F, the body portion 210 can be divided into an upper member 210a and a bottom member 210b. Then, the upper member 210a and the bottom member 210b can be molded so as to be punched out in the axial direction of the opening 211. Therefore, the silencer 201F can be easily manufactured. Similar to the muffler 201F according to the other embodiment, the muffler 201F according to the seventh embodiment can reduce the noise generated by the motor 101 while realizing miniaturization.

If a circular brim is provided on the bottom of the motor 101, the brim may be used instead of the bottom member 210b. In this case, the bottom member 210b can be deleted.

[Embodiment 8]
Hereinafter, the configuration of the silencer 201G according to the eighth embodiment will be described with reference to FIG. FIG. 18 is a cross-sectional view showing the configuration of the silencer 201G according to the eighth embodiment.

As shown in FIG. 18, the silencer 201G according to the eighth embodiment is different from the silencer 201G according to the other embodiment in that the body portion 210G is formed in the shape of a cross plate when viewed from above. ing. The opening 211G is formed in a circular shape at the center of the body portion 210G when viewed from above. The acoustic tube is divided into an acoustic tube 202Ga along the first direction and an acoustic tube 202Gb along the second direction orthogonal to the first direction, and the acoustic tubes are parallel to each other in the same direction. Have been placed.

The muffler 201G according to the eighth embodiment can reduce the noise generated by the motor 101 while realizing miniaturization like the muffler 201G according to the other embodiments.

[Embodiment 9]
Hereinafter, the configuration of the silencer 1201 according to the ninth embodiment will be described with reference to FIGS. 19A, 19B, and 20A. FIG. 19A is an enlarged vertical cross-sectional view showing the configuration of the washing machine S equipped with the silencer 1201 according to the ninth embodiment in the vicinity of the motor 101. FIG. 19B is a vertical cross-sectional view showing a configuration when the silencer 1201 is attached to the motor 101. FIG. 20A is a cross-sectional view showing a configuration when the silencer 1201 is attached to the motor 101.

As shown in FIG. 19A, the fan casing 103 is attached to the motor 101 via the body portion 1210 of the silencer 1201. The fan casing 103 and the silencer 1201 are connected to each other with screws or the like via a vibration-proof rubber 1072. The body portion 1210 of the silencer 1201 and the motor 101 are fixed via a vibration-proof rubber 1071 installed on the motor collar portion 1011 provided on the motor 101. The motor 101 is attached to the fan casing 103 via the anti-vibration rubber 106 near the root of the shaft 102. In the silencer 1201, the acoustic space 1202 is formed by the body portion 1210, the motor collar portion 1011 and the anti-vibration rubber 1071. In the washing machine S (see FIG. 1), the silencer 1201 reduces noise such as electromagnetic noise generated by the motor 101, and the anti-vibration rubber 1071 reduces unbalanced vibration of the shaft generated by the motor 101.

In the ninth embodiment, the washing machine S is provided with a gap between the silencer 1201 and the motor 101. As a result, the washing machine S can block the vibration transmitted from the motor 101 to the silencer 1201 side, although the sound insulation property is lowered. However, whether or not to provide this gap may be determined in consideration of the characteristics of noise generated by the motor 101, the characteristics of vibration, the material of the silencer 1201, the cooling of the motor 101, and the like.

As shown in FIG. 19B, the silencer 1201 includes a plurality of acoustic spaces 1202 having a hollow inside, which is formed of a body portion 1210, a motor collar portion 1011 and an anti-vibration rubber 1071. As shown in FIG. 20A, the acoustic space 1202 is formed so as to be axially partitioned by the wall portion 1221 from the central opening 1211 of the body portion 1210 to the vicinity of the outer peripheral surface of the body portion 1210. In the present embodiment, the wall portion 1221 is formed so as to increase in width from the central opening 1211 of the body portion 1210 toward the outer peripheral surface of the body portion 1210. As a result, the width W of each acoustic space 1202 is substantially constant from the opening in the central direction 1211 toward the outer peripheral surface of the body portion 1210. A central opening 1211 for passing the housing 101a of the motor 101 is formed in the central portion of the body portion 1210. The silencer 1201 can be molded from a resin material.

As shown in FIG. 19B, each acoustic space 1202 has an open one end A1 and a closed other end A2. Then, in each acoustic space 1202, with respect to the axial direction of the central opening 1211 so that one end A1 faces the direction of the central opening 1211 and the other end A2 faces the direction of the outer peripheral surface of the body 1210. Are arranged in the orthogonal direction (left-right direction in FIG. 19B). As a result, a plurality of acoustic spaces 1202 are formed on the same plane inside the body portion 1210. The axial direction of the central opening 1211 is the direction in which the housing 101a of the motor 101 is passed through the central opening 1211 (vertical direction in FIG. 19B). Further, the entire bottom surface of the body portion 1210 is an opening.

As shown in FIG. 20A, the body portion 1210 of the silencer 1201 is formed in an annular shape when viewed from above. The opening portion 1211 in the central direction is formed in a circular shape in the central portion of the body portion 1210 when viewed from above. The inner diameter of the opening 1211 in the central direction is slightly larger than the diameter of the housing 101a of the motor 101. Each acoustic space 1202 is arranged radially around the center of the central opening 1211. That is, each acoustic space 1202 is arranged so as to extend linearly in the normal direction with respect to the circular surface of the opening in the central direction 1211.

In such a silencer 1201, when the silencer 1201 is attached to the motor 101, a plurality of acoustic spaces 1202 are arranged so as to surround the housing 101a of the motor 101. Then, the opened end portion A1 (see FIG. 19B) of each acoustic space 1202 is in a state of facing the direction of the housing 101a.

In such a silencer 1201, sound waves radiated from the side surface of the housing 101a of the motor 101 enter the inside of the acoustic space 1202 from the opened one end A1 (see FIG. 19B), and the acoustic space 1202 is closed. It is reflected at the other end A2 (see FIG. 19B). At that time, the silencer 1201 can be used to cancel the sound wave (reflected wave) reflected by the other end A2 to cancel the sound wave (incident wave) incident from the one end A1. Therefore, the silencer 1201 can reduce the noise generated by the motor 101.

As shown in FIGS. 19B and 20A, the acoustic space 1202 is composed of a body portion 1210, a vibration-proof rubber 1071, and a motor collar portion 1011, and has a depth length D (see FIG. 19B) and a width W (see FIG. 20A). ) And height H (see FIG. 19B). The depth length D of the acoustic space 1202 (that is, the length from one end A1 (see FIG. 19B) to the other end A2 (see FIG. 19B) of the acoustic space 1202) is relative to the wavelength of the sound wave of the muffling target frequency. , It is good that it is set to be about 1/4. Specifically, the depth length D of the acoustic space 1202 is preferably a length within the range of (λ × 1/4) ± 10 (%) with respect to the wavelength λ of the sound wave of the muffling target frequency.

Such a silencer 1201 includes an incident wave (sound wave radiated from the motor 101) incident from the opened one end A1 (see FIG. 19B) and a reflected wave reflected by the other end A2 (see FIG. 19B). The phase (wavelength) of can be shifted by 1/2. Therefore, the silencer 1201 can make the incident wave and the reflected wave out of phase. Such a silencer 1201 can act so that the reflected wave and the incident wave cancel each other out. As a result, the silencer 1201 can silence the incident wave (sound wave radiated from the motor 101). Further, the silencer 1201 can reduce vibrations such as shaft imbalance generated in the motor 101 by the vibration-proof rubber 1071.

The width W and height H of the acoustic space 1202 are set so that the sound wave of the muffling target frequency becomes a plane wave (that is, a wave whose wavefront is on a plane perpendicular to the traveling direction of the wave) inside the acoustic space 1202. It should be done. Therefore, for example, the width W and the height H of the acoustic space 1202 are set to have a magnitude of (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the muffling target frequency, respectively. Good. The silencer 1201 configured in this way can cancel (realize) a plane wave inside each acoustic space 1202 to cancel the noise. As a result, the silencer 1201 can efficiently reduce the noise generated by the motor 101.

However, the shape of the acoustic space 1202 is determined according to constraints such as the size of the motor 101, the frequency for noise muffling (frequency in the band for muffling), and the space of the home appliance to which the motor 101 is attached. Will be done. Further, the number of acoustic spaces 1202 is also determined according to constraints such as the size of the motor 101, the frequency for noise muffling, and the space of the home electric appliance to which the motor 101 is attached.

The silencer 1201 (see FIG. 20A) according to the ninth embodiment can be modified as shown in FIGS. 20B to 21C, for example. Hereinafter, the configuration of each modification will be described with reference to FIGS. 20B to 21C.

<First Modified Example of Embodiment 9>
FIG. 20B is a cross-sectional view showing the configuration of the silencer 1201A according to the first modification of the ninth embodiment. FIG. 20B shows the configuration of the silencer 1201A when it is not attached to the motor 101.

As shown in FIG. 20B, the silencer 1201A according to the first modification of the ninth embodiment has an acoustic space 1202A instead of the acoustic space 1202 as compared with the silencer 1201 according to the ninth embodiment (see FIG. 20A). It differs in that it is formed inside the body portion 1210.

The acoustic space 1202A of the silencer 1201A according to the first modification is arranged radially around the center of the opening 1211 in the central direction, similarly to the acoustic space 1202 (see FIG. 20A) of the silencer 1201 according to the ninth embodiment. Has been done. However, the acoustic space 1202A of the silencer 1201A according to the first modification is different from the acoustic space 1202 (see FIG. 20A) of the silencer 1201 according to the ninth embodiment, and each acoustic space has a width W1 to a width W2. The width of 1202 is formed so as to widen from the central opening 1211 toward the outer peripheral surface of the body portion 1210. That is, in the acoustic space 1202A, the width of one end A1 (see FIG. 19B) is wider so that the closed other end A2 (see FIG. 19B) is wider than the opened one end A1 (see FIG. 19B). W1 is formed so that the width of the other end A2 (see FIG. 19B) is wider than the width W1.

In this first modification, the wall portion 1221a that divides each acoustic space 1202A of the body portion 1210 is formed to have the same width (constant thickness) with respect to the normal direction of the opening. The silencer 1201A according to the first modification has a width of the acoustic space 1202A from the central opening 1211 to the body portion 1210 as compared with the acoustic space 1202 (see FIG. 20A) of the silencer 1201 of the ninth embodiment. It can be widened toward the outer peripheral surface. Therefore, the silencer 1201A according to the first modification can increase the amount of sound waves incident on the acoustic space 1202A and improve the sound deadening effect.

<Second variant of Embodiment 9>
FIG. 20C is a cross-sectional view showing the configuration of the silencer 1201B according to the second modification of the ninth embodiment. FIG. 20C shows the configuration of the silencer 1201B when it is not attached to the motor 101.

As shown in FIG. 20C, the silencer 1201B according to the second modification of the ninth embodiment is compared with the silencer 1201A (see FIG. 20B) according to the first modification, instead of the acoustic space 1202A, the acoustic space 1202B. Is different in that is formed inside the body portion 1210.

In this second modification, the wall portions 1222 that divide each acoustic space 1202B of the body portion 1210 have the same width (constant thickness) and spiral around the center of the body portion 1210 (that is, swivel). It is formed (to do). The acoustic space 1202B of the silencer 1201B according to the second modification has a rectangular cross-sectional shape in the vertical direction (perpendicular to the paper surface) and a circle around the opening in the central direction 1211. It is arranged so as to swivel in an arc. That is, the acoustic space 1202B of the silencer 1201B according to the second modification has a rectangular vertical cross-sectional shape, and has an arc shape in the clockwise direction or the counterclockwise direction (clockwise direction in the example shown in FIG. 20C). It is arranged so that it curves inward and extends. The width of the entrance of the acoustic space 1202B is the width W1, and the width of the inner wall is the width W2 wider than the width W1.

The silencer 1201B according to the second modification keeps the dimension of the depth length D1 of the acoustic space 1202B (corresponding to the depth length D of FIG. 19B) (that is, without changing the frequency to be silenced). ), The outer diameter of the silencer 1201B can be reduced. Therefore, the silencer 1201B according to the second modification can be made smaller than the silencer 1201 according to the ninth embodiment (see FIG. 19B). In other words, the silencer 1201B according to the second modification has an outer diameter similar to that of the silencer 1201 according to the ninth embodiment (see FIG. 19B), and can mute low frequencies.

<Third variant of Embodiment 9>
FIG. 21A is a cross-sectional view showing the configuration of the silencer 1201C according to the third modification of the ninth embodiment. FIG. 21A shows the configuration of the silencer 1201C when it is not attached to the motor 101.

As shown in FIG. 21A, the silencer 1201C according to the third modification of the ninth embodiment has an acoustic space 1202C instead of the acoustic space 1202 as compared with the silencer 1201 according to the ninth embodiment (see FIG. 20A). It differs in that it is formed inside the body portion 1210.

The acoustic space 1202C of the silencer 1201C according to the third modification is different from the silencer 1201 according to the ninth embodiment (see FIG. 20A) in that the body partition 1231 is provided inside. The fuselage partition 1231 is a portion formed so as to project inward from the inner wall of the acoustic space 1202C and extend in the axial direction (mounting direction of the motor 101). The body partition 1231 has a plate-like shape, and is formed radially around the center of the body portion 1210. The length D2 of the fuselage partition 1231 is shorter than the depth length D of the acoustic space 1202C (that is, the length from one end A1 (see FIG. 19B) to the other end A2 (see FIG. 19B)).

Compared with the silencer 1201 (see FIG. 20A) according to the ninth embodiment, the silencer 1201C according to the third modification is not only a sound wave having a frequency corresponding to the depth length D of the acoustic space 1202C, but also a body. Sound waves with a frequency corresponding to the length D2 of the partition 1231 can also be muted. For example, the silencer 1201C according to the third modification is the silencer 1201 according to the ninth embodiment (see FIG. 20A) when the length D2 of the body partition 1231 is 1/2 of the depth length D of the acoustic space 1202C. ), It is possible to mute sound waves with twice the frequency.

<Fourth Modified Example of Embodiment 9>
FIG. 21B is a cross-sectional view showing the configuration of the silencer 1201D according to the fourth modification of the ninth embodiment. FIG. 21B shows the configuration of the silencer 1201D when it is not attached to the motor 101.

As shown in FIG. 21B, the silencer 1201D according to the fourth modification of the ninth embodiment is a substitute for the acoustic space 1202A as compared with the silencer 1201A (see FIG. 21B) according to the first modification of the ninth embodiment. The difference is that the acoustic space 1202D is formed inside the body portion 1210.

The acoustic space 1202D of the silencer 1201D according to the fourth modification is similar to the silencer 1201C (see FIG. 20A) according to the third modification as compared with the silencer 1201A (see FIG. 20B) according to the first modification. , The difference is that the fuselage partition 1231 is provided inside. Compared with the silencer 1201A (see FIG. 21B) according to the first modification, the silencer 1201D according to the fourth modification is not only a sound wave having a frequency corresponding to the depth length D of the acoustic space 1202D, but also a sound wave having a frequency corresponding to the depth length D of the acoustic space 1202D. Sound waves with a frequency corresponding to the length D2 of the fuselage partition 1231 can also be muted.

<Fifth Modified Example of Embodiment 9>
FIG. 21C is a cross-sectional view showing the configuration of the silencer 1201E according to the fifth modification of the ninth embodiment. FIG. 21C shows the configuration of the silencer 1201E when it is not attached to the motor 101.

As shown in FIG. 21C, the silencer 1201E according to the fifth modification of the ninth embodiment is a substitute for the acoustic space 1202B as compared with the silencer 1201B (see FIG. 20C) according to the second modification of the ninth embodiment. The difference is that the acoustic space 1202E is formed inside the body portion 1210.

The acoustic space 1202E of the silencer 1201E according to the fifth modification is different from the silencer 1201B (see FIG. 20C) according to the second modification in that the body partition 1232 is provided inside. The fuselage partition 1232 is a portion formed so as to project inward from the inner wall of the acoustic space 1202E and extend in the axial direction (mounting direction of the motor 101). The body partition 1232 has a plate-like shape, and is formed so as to rotate around the center of the body portion 1210. The length D3 of the fuselage partition 1232 is shorter than the depth length D1 of the acoustic space 1202E (that is, the length from one end A1 (see FIG. 19B) to the other end A2 (see FIG. 19B)).

Compared with the silencer 1201B (see FIG. 20C) according to the second modification, the silencer 1201E according to the fifth modification is not only a sound wave having a frequency corresponding to the depth length D1 of the acoustic space 1202E, but also a sound wave having a frequency corresponding to the depth length D1 of the acoustic space 1202E. Sound waves with a frequency corresponding to the length D3 of the fuselage partition 1232 can also be muted. For example, the silencer 1201E according to the fifth modification is the silencer 1201B according to the second modification when the length D3 of the body partition 1232 is 1/2 of the depth length D1 of the acoustic space 1202E (FIG. 20C). It is possible to mute sound waves with twice the frequency of (see).

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of the embodiment with another configuration, and it is also possible to add another configuration to the configuration of the embodiment. In addition, it is possible to add / delete / replace other configurations for a part of each configuration.

In the above-described embodiment, it has been described that the home electric appliance is a washing machine. However, the present invention is also applicable to home appliances other than washing machines (for example, home appliances such as vacuum cleaners, refrigerators, air conditioners, etc.) as long as they are home appliances having a motor for driving fans, blowers, etc. Can be done.

1 Outer frame 2 Outer tank 3 Rotating tank 4 Stirring blade 5 Outer lid 5a Handle 6 Top cover 7 Water supply unit 8 Water supply hose connection port 9 Drying mechanism 10 Drive motor 20 Bottom circulation path 21 Dehumidifying vertical passage 22 Blower 23 Upper bellows hose 24 Electric heater 25 Return connection circulation hose 26 Lower bellows hose 31 Bottom drop 32 Foreign matter removal trap 33 Washing thread waste removal device 34 Inner lid 35 Input device 41 Lower communication pipe 42 Washing water drainage channel 43 Washing water circulation water channel 44 Drain valve 45 Drying filter 46 Washing water circulation water vertical water channel 47 Water level sensor 49 Air tube 50 Air trap 51 Power switch 52 Operation switch 53 Display 54 Operation panel 101 Motor 101a Housing 102 Shaft 103 Fan casing 104 Impeller 105 Intake port 106, 107, 1071, 1072 Anti-vibration rubber 201, 201A, 201B, 201C, 201D, 201E, 201F, 201G Silent device 202, 202A, 202B, 202C, 202D, 202Da, 202Db, 202Ea, 202Eb, 202Ga, 202Gb Acoustic tube 202Ca Upper inner wall surface 202Cb Lower inner Wall surface 203 Intake port 204 Exhaust port 205 Partition plate 206 Cooling part 210, 210G Body part 210a Upper member 210b Bottom member (bottom)
211,211G Opening 211o Opening center 301a, 302a One side inner wall surface 301b, 302b The other side inner wall surface 1011 Motor collar 1201, 1201A, 1201B, 1201C, 1201D, 1201E Silent device 1202, 1202A, 1202B, 1202C, 1202D, 1202E Acoustic space 1210 Body part 1221,1221a, 1222 Wall part 1231,1232 Body partition 1211 Central direction opening A1 One end A2 Other end D, D1 Depth length (length)
D2, D3 Length H Height L Central depth length L11, L12, L21, L22 Depth length R Mute frequency R
S washing machine (home appliances)
W width λ wavelength

Claims (29)

1. It has a fuselage that contains multiple acoustic tubes that are hollow inside.
   An opening for passing the housing of the motor is formed in the central portion of the body portion.
   Each of the acoustic tubes
   It has an open end and a closed other end, and
   A silencer characterized in that one end thereof is arranged so as to face the direction of the opening and the other end thereof faces the direction of the outer peripheral surface of the body portion.
2. In the silencer according to claim 1,
   The body portion is formed in a disk shape when viewed from above.
   The opening is formed in a circular shape at the center of the body portion in a top view.
   A silencer characterized in that each of the acoustic tubes is arranged radially around the center of the opening.
3. In the silencer according to claim 1,
   The body portion is formed in a disk shape when viewed from above.
   The opening is formed in a circular shape at the center of the body portion in a top view.
   A silencer characterized in that each of the acoustic tubes is arranged so as to swivel in a straight line around the opening.
4. In the silencer according to claim 1,
   The body portion is formed in a disk shape when viewed from above.
   The opening is formed in a circular shape at the center of the body portion in a top view.
   A silencer characterized in that each of the acoustic tubes is arranged so as to swivel around the opening in an arc shape.
5. In the silencer according to claim 1,
   The body portion is formed in the shape of a cross plate when viewed from above.
   The opening is formed in a circular shape at the center of the body portion in a top view.
   Each of the acoustic tubes is separately arranged along the first direction and along the second direction orthogonal to the first direction, and is arranged so as to be parallel to each other in the same direction. A silencer characterized by being
6. In the silencer according to claim 1,
   The length from the one end to the other end of each of the acoustic tubes is within the range of (λ × 1/4) ± 10 (%) with respect to the wavelength λ of the sound wave of the muffling target frequency. A silencer characterized by being.
7. In the silencer according to claim 1,
   A silencer characterized in that the width of each of the acoustic tubes is (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the frequency to be silenced.
8. In the silencer according to claim 1,
   A silencer characterized in that the height of each of the acoustic tubes is (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the frequency to be silenced.
9. In the silencer according to claim 1,
   Each of the acoustic tubes is a silencer characterized in that the cross-sectional shape of the opening in the axial direction has a rectangular shape.
10. In the silencer according to claim 3,
    A silencer characterized in that the length from the one end portion to the other end portion of each of the acoustic tubes differs between the inner wall surface on one side and the inner wall surface on the other side.
11. In the silencer according to claim 1,
    A silencer characterized in that the length from the one end portion to the other end portion of each of the acoustic tubes differs between the upper inner wall surface and the lower inner wall surface.
12. In the silencer according to claim 1,
    The body portion is a silencer having a plurality of layers in which a plurality of the acoustic tubes are arranged in each axial direction of the opening.
13. In the silencer according to claim 12,
    A silencer characterized in that the length from the one end portion to the other end portion of each of the acoustic tubes differs depending on the layer.
14. In the silencer according to claim 12,
    A silencer having a cooling unit for cooling the motor.
15. In the silencer according to claim 1,
    The body portion is a silencer characterized in that the bottom portion has a removable structure.
16. In the silencer according to claim 1,
    The body portion is a silencer characterized in that when the housing of the motor is passed through the opening, the housing of the motor and one end of the acoustic tube are separated from each other.
17. In the silencer according to claim 16,
    A silencer characterized in that a vibration isolator is arranged at one end of the acoustic tube of the body portion.
18. It has an annular body with an open bottom and a hollow interior.
    A central opening for passing the housing of the motor is formed in the central portion of the body portion.
    A plurality of acoustic spaces are formed in the body portion, and a plurality of acoustic spaces are formed.
    A silencer characterized in that the acoustic space is formed so as to be axially partitioned from the central opening of the body portion to the vicinity of the outer peripheral surface of the body portion.
19. In the silencer according to claim 18,
    A silencer characterized in that the opening on the bottom surface of the body portion is closed by a part of the motor and anti-vibration rubber.
20. In the silencer according to claim 18,
    The central opening is formed in a circular shape at the center of the body when viewed from above.
    A silencer characterized in that each of the acoustic spaces is arranged radially around the center of the opening in the central direction.
21. In the silencer according to claim 20,
    A silencer characterized in that the width of each of the acoustic spaces is constant from the opening in the central direction toward the outer peripheral surface of the body portion.
22. In the silencer according to claim 20,
    A silencer characterized in that the width of each of the acoustic spaces is widened from the opening in the central direction toward the outer peripheral surface of the body portion.
23. In the silencer according to claim 18,
    The central opening is formed in a circular shape at the center of the body when viewed from above.
    A silencer characterized in that each of the acoustic spaces is arranged so as to swirl around the opening in the central direction in an arc shape.
24. In the silencer according to claim 18,
    The length from one end to the other end of each of the acoustic spaces is within the range of (λ × 1/4) ± 10 (%) with respect to the wavelength λ of the sound wave of the muffling target frequency. A silencer that features that.
25. In the silencer according to claim 18,
    A silencer characterized in that the width of each of the acoustic spaces is (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the frequency to be silenced.
26. In the silencer according to claim 18,
    A silencer characterized in that the height of each of the acoustic spaces is (λ × 1/2) or less with respect to the wavelength λ of the sound wave of the frequency to be silenced.
27. In the silencer according to claim 18,
    Each of the acoustic spaces has a fuselage partition formed so as to extend in the axial direction inside.
    A silencer characterized in that the length of the body partition is shorter than the length from one end to the other end of the acoustic space.
28. With the motor
    A home electric appliance including the silencer according to claim 1, which is attached to the motor.
29. In the home electric appliance according to claim 28
    A home appliance characterized by being configured as a washing machine.

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