JP2001096090A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise leaking from between a covering box of a machine having a driving sound source like a motor and a lid attached an upper part of the covering box to upper outside of the machine. SOLUTION: A washing machine has driving mechanism 33 like a motor 32 inside of covering box 22, and is provided with a lid 28 to open and close an aperture for an entrance and exit on upper part of the covering box 22. The lid 28 is designed to have a resonance box 48 with an inside hollow by being formed in a shape of midair container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine which copes with noise generated from a driving sound source such as a motor of a washing machine or a dishwasher.

[0002]

2. Description of the Related Art Conventionally, for example, in a dehydrating and washing machine 1 shown in FIG. An inner tub 4 of the washing tub is rotatably provided, and a well-known stirrer (not shown) is rotatably provided at the inner bottom of the inner tub 4. Hole 4
a. A drive mechanism (not shown) including a well-known motor and a clutch mechanism is provided at the outer bottom of the outer tub 3, and its rotational power is transmitted to the agitator or the inner tub 4.

On the other hand, the housing 2 has a rectangular box-shaped outer box 8.
And an input port 9 attached to the upper surface for taking in and out the laundry.
And a top cover 10 made of a synthetic resin having a rectangular opening 11 formed in the periphery of the inlet 9 of the top cover 10. An opening / closing lid 12 for opening and closing the insertion port 9 is rotatably supported. The opening / closing lid 12 has a two-foldable structure including a front lid 12a formed into a rectangular plate shape with a synthetic resin and a rear lid 12b rotatably connected via a hinge portion 13. . And this opening / closing lid 1
Reference numeral 2 denotes a configuration in which the rear end of the lid 12b is rotatably supported by a hinge shaft 14 protruding from the top cover 10 so that the opening 9 is opened and closed.

[0004]

According to the above construction, since the opening / closing lid 12 is rotatably supported, the opening / closing lid 12 is provided between the rotation base end side of the opening / closing lid 12 and the inner surface of the top cover 10. It is necessary to provide a rotation gap D that does not abut, and specifically, as shown in an enlarged manner in FIG. 13, a vertical gap between the lower surface of the rear end portion of the rear lid 12 b and the recess 11. A gap d2 is formed in the front-rear direction (the left-right direction in the drawing) continuous with the gap d1. Therefore, even when the opening / closing lid 12 is in the closed state, the peripheral end of the outer peripheral side excluding the rotation base end side is formed. Although it is in a substantially closed state in contact with the upper surface of the recess 11, the rotation base end side has a configuration in which there is always a gap D for allowing the rotation.

[0005] However, the washing machine 1 also generates various noises in the operating state. As the sound source,
For example, driving noise generated by a driving mechanism such as a motor during the washing and dehydrating operations, wind noise of the inner tub 4 during the dehydrating operation, water flow noise generated by the stirring blades, and air generated due to rotation of the inner tub 4 Wind noise generated when the flow passes through the gap D and is discharged to the outside, and other mechanical vibration noises are considered. Therefore, the noise generated during the washing and dehydration operations is not sufficient only by the sound insulation effect by closing the opening / closing lid 12, and leaks upward as noise from the gap D between the housing 2 and the top cover 10 to the outside of the machine. Noise from the upper part not only hinders noise reduction, but also causes problems such as giving the user unpleasantness by harshness.

As a countermeasure against the noise, an elastic body such as a sponge (not shown) is provided around the outer periphery of the lower surface of the opening / closing cover 12 substantially all around, and when the opening / closing cover 12 is closed, the elastic body is in close contact with the upper surface of the top cover 10. By doing so, it is conceivable to prevent noise from inside from leaking out of the machine. However, providing and attaching such an elastic body is not only troublesome and costly, but also easily deteriorates due to long-term use, and furthermore, as described above, the rear end, which is one end of the opening / closing lid 12, is rotatable. In the support structure described above, since the gaps d1 and d2 that allow the rotation are not small, a completely sealed state cannot be obtained even if the elastic body is provided. If it is possible to seal, the air permeability between the inside and the outside of the casing 2 is impaired, and the evaporation of water remaining in the outer tubs 4 and 3 after the washing operation is completed, thereby generating mold and an unpleasant odor. Is a factor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its object to provide an opening and closing device provided with a silencing function to prevent noise leaking upward from the machine through a gap between an opening and closing cover attached to an upper portion of a housing. It is an object of the present invention to provide a cleaning device which can be reduced by a lid.

[0008]

In order to achieve the above object, a cleaning apparatus according to the present invention has a drive mechanism such as a motor inside a housing, and opens and closes an internal / external communication port on an upper portion of the housing. In an apparatus having a lid, the opening / closing lid is formed in a hollow container shape, and a resonance chamber having a hollow inside is provided (the invention of claim 1).

According to such a configuration, the driving sound and the like emitted from the motor or the like as a sound source is not only a sound insulation effect by the closed lid, but also the sound wave is a resonance phenomenon in the resonance chamber formed in the lid. The sound energy is canceled out and the sound energy is canceled and reduced. Therefore, it is possible to effectively suppress the noise that is emitted from the inside and outside communication ports at the upper part of the housing to the outside of the machine,
The device can be made quieter and the user can work comfortably.

According to the first aspect of the present invention, the resonance chamber has an entrance and an exit facing a gap formed between the resonance chamber and the housing in a closed state.
Invention).

According to such a configuration, sound waves that are to leak out of the gap can be quickly taken in from the entrance and exit and entered the resonance chamber, so that noise from the gap can be effectively reduced and The air permeability inside and outside the housing can be maintained through the gap, and the generation of mold and unpleasant odor in the housing can be prevented.

[0012] In the second aspect of the present invention, the entrance and exit of the resonance chamber are formed by a plurality of openings.

According to such a configuration, since the entrance is formed by a plurality of openings, the openings can be made sufficiently small with respect to the resonance chamber, which is suitable as a resonance type silencer with a simple configuration. In addition, the rigidity of the side wall portion of the opening / closing lid forming the entrance / exit can be increased, so that a hollow container-shaped opening / closing lid that can be practically used in terms of strength can be provided.

According to a second aspect of the present invention, the resonance chamber is chamfered with respect to an air flow passing through a gap formed between the resonance chamber and the housing in a closed state. 4 invention).

According to such a configuration, the air flow smoothly flows from the gap, and the generation of noise due to the turbulent flow can be prevented. Therefore, the generation of various noises leaking from the gap can be effectively suppressed. .

According to a second aspect of the present invention, the resonance chamber has a bottom plate portion which is inclined downward toward the entrance when the lid is closed (claim 5).
Invention).

According to this configuration, even if the used water liquid enters the interior of the resonance chamber from the entrance, it can be easily drained from the entrance from the downwardly sloping bottom portion. And can prevent generation of mold and unpleasant odor.

Further, according to the first aspect of the present invention, the resonance chamber is configured to have a small resonance chamber divided into a plurality of sections by a partition plate (the invention of claim 6).

According to such a configuration, it is effective to reduce noise leaking out of the machine and to prevent dent deformation of the resonance chamber having a hollow inside. Therefore, the opening and closing of a hollow container having excellent strength is provided. A lid can be provided. In this case, when the cavity shape and size of each small resonance chamber have the same configuration, a remarkable damping effect is exhibited for a specific frequency. Since a wide damping effect can be expected, the degree of freedom in design can be increased in practical use.

According to the first aspect of the present invention, the resonance chamber is configured such that the opening / closing lid and the bottom plate are connected and fixed by elastic engagement means with a predetermined space. 7 invention).

According to this configuration, the hollow chamber-shaped resonance chamber can be easily manufactured and provided, and the user can remove and clean the bottom plate as needed, and can be used hygienically for a long period of time.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment in which the washing apparatus of the present invention is applied to a washing machine for both dehydration will be described with reference to FIGS. First, FIG. 2 is a vertical cross-sectional side view of the washing machine 21. Referring to the overall configuration, a housing 22 constituting an external appearance is formed by closing a rectangular box-shaped outer box 23 having upper and lower surfaces open and a lower surface. It comprises a base plate 25 which is attached and has legs 24 at four corners, and a top cover 26 which is attached so as to cover the upper surface of the outer box 23 and is formed of a synthetic resin in the shape of an inverted dish container.

At a substantially central portion of the top cover 26, an input port 27 as a communication port between the inside and the outside of the housing 22 is formed in a cylindrical shape, and the input port 27 is described in detail later. Has a cover 28 that opens and closes it rotatably mounted. Inside the housing 22, an outer tub 29 as a water receiving tank elastically supported by the vibration-isolating and suspending mechanism 31, and a large number of through holes 30a only at the upper end of the peripheral wall serving as a washing tub and a dewatering tub.
And a substantially non-porous inner tank 30 having

A disk-shaped tank cover 29a is attached to the upper end of the outer tank 29, and a clutch mechanism or the like is mounted on the outer bottom, for example, a motor 32 composed of an outer rotor type DC brushless motor. The inner tank 30 is provided with a balance ring 35 at the upper end and a stirring blade 36 at the inner bottom. However, the stirring blade 36 is directly connected to a rotating shaft 37 provided on the outer rotor of the motor 32, while the inner tank 30 is connected to a hollow rotating shaft 38 inserted around the outer periphery of the rotating shaft 37. The base end is connected to the outer rotor via the clutch mechanism described above.

FIG. 1 is an enlarged longitudinal side view showing the upper half of the washing machine 21, and FIG.
FIG. 4 is an exploded perspective view of the opening / closing lid 28 and FIG.
With reference to these drawings, the mounting structure of the opening / closing lid 28 will be specifically described with reference to these drawings. The peripheral edge of the opening of the inlet 27 of the top cover 26 has a substantially rectangular flat shape and forms a recess 39 recessed from the upper surface of the top cover 26. The port 27 is provided so as to be openable and closable.

The opening / closing lid 28 is made of synthetic resin and has, for example, a structure in which a front lid 40 and a rear lid 41 are connected to each other. The protruding flange portions 42 and 43 are formed respectively, and hinge pieces 44 and 45 protruding from both of the flange portions 42 and 43 on the connection side are rotatably supported by the shaft, so that the front portion is formed. The lid 40 and the rear lid 41 are configured to be foldable in two. Accordingly, when the inlet 27 is closed by the front lid 40 and the rear lid 41, the inlet 27 is covered as a single opening / closing lid 28, and the lower ends of the flanges 42 and 43 are flat upper surfaces of the recess 39. It is placed in a state where it is almost joined to.

The front cover 40 is provided with a handle 4 on the front side of the upper surface.
In contrast to the single-plate structure made of resin in which 6 is recessed,
The rear lid 41 has, for example, a bottom frame 47 formed of a synthetic resin in the shape of a shallow dish attached to the back side thereof to form a hollow container-shaped resonance chamber 48 having a hollow interior. That is, the bottom frame 47
As shown particularly in the exploded perspective view of FIG. 4, the outer peripheral wall 49 has a height slightly smaller than (equal to) the height of the flange portion 43 over the entire outer periphery thereof. 49a has a plurality of openings 50 as entrances and exits.
When the opening / closing lid 28 is in a closed state, the opening 50 faces the gap D between the opening 39 and the inner peripheral surface of the recess 39 as shown in FIGS. I have. The details of the gap D will be described later.

Further, both side corners of the rear peripheral side wall 49a of the bottom frame 47 are depressed inward to form the flange 43 of the rear lid 41.
And a bottom plate portion 52 of the bottom frame 47 excluding the space 51 is provided when the rear cover 41 is in a substantially horizontal state. When in the closed state, as shown in the cross-sectional view of FIG. 5, the rear peripheral side wall 49a has a bottom surface inclined downward, and the opening 50 is provided along the inclined lower end portion.

Then, the bottom frame 47 having such a structure is attached to the rear lid 41.
In the present configuration, the rear cover 41
A plurality of protrusions 53 project from the lower inner surface side of the flange portion 43 at intervals in the circumferential direction, and a concave portion 54 is formed in a peripheral side wall 49 of the bottom frame 47 at a position corresponding to the protrusion 53. The protrusions 53 are elastically engaged with the recesses 54, and the bottom frame 47 is integrally attached to the rear lid 41. As a result, the rear lid 41 is closed except for one side surface having the opening 50 on the rear surface side, and the hollow container-shaped resonance chamber 48 having a hollow inside is formed.

As shown in FIG. 3, the opening / closing lid 28 composed of the front lid 40 and the rear lid 41 has two rear end portions at two positions on both rear sides in the recess 39 of the top cover 26, as shown in FIG. It is rotatably supported by a hinge mechanism having a projecting hinge shaft 55. That is, the hinge shafts 55 extend inward from each other and are formed at a predetermined distance from the upper surface of the recess 39. Correspondingly, both sides of the rear flange portion 43a of the rear lid 41, which is the rear end of the opening / closing lid 28, are provided. In the part, a hinge hole 56a which constitutes a hinge mechanism as shown particularly in FIG.
The hinge piece 56 is formed so as to protrude, and is fitted on the hinge shaft 55 so as to elastically deform the hinge piece 56. Accordingly, the opening / closing lid 28 is rotatably supported by the hinge mechanism. Is done.

In this case, the opening / closing lid 2 is supported on the hinge shaft 55 as a fulcrum.
When the pivot 8 rotates, a gap is required in which the rear flange portion 43a of the rear lid 41 does not come into contact with the inner surface of the recess 39, and this is the gap D described above. In particular, as shown in the partially enlarged cross-sectional view of FIG. 6, the gap D is a rotation locus a drawn by the ridge of the rear lid 41 and the lower end of the rear peripheral side wall 49 a of the rear flange 43 a or the bottom frame 47. Is set to a gap size that does not contact the inner surface of the recess 39. In other words, the gap d1 is composed of a gap d1 in the up-down direction and a gap d2 in the front-rear direction (left-right direction in the drawing) continuous with the gap d1. It is set to be larger than d2 (d1> d2).

However, it is desirable that the gap D is as small as possible, and in order to cope with the gap d1, which tends to be large,
Generally, the height of the rear flange 43a is suppressed to be smaller than that of the other flanges 43, or a part of the recess 39 where the rear end of the rear lid 41, which is the movable side, is located is further lowered. The recessed recess is provided so that it does not come into contact when rotating, and the opening / closing lid 28 is arranged so as not to be raised above the recess 39 as much as possible (projected state).

Accordingly, in a state where the charging port 27 is closed by the opening / closing lid 28, the lower end of the other flange portion 43 except for the portion near the rear flange portion 43a and the upper surface of the recess 39 are held in a substantially closed state. On the other hand, at the rear end of the movable side, the housing 22 is separated from the top cover 26 via a gap D.
The inside and the outside communicate with each other, and air permeability is always ensured.

The operation of the washing machine 21 of the present embodiment configured as described above will be described. First, in FIG. 2, when the washing operation is performed, after the laundry, the washing water, and the detergent are put into the inner tub 30, the drive mechanism unit 33 such as the motor 32 is energized and driven. The swirling water flow as the washing water flow is generated by the rotation drive of the directly connected stirring blades 36, and the washing operation is performed. On the other hand, at the time of the spin-drying operation, the drain valve 34 is opened, the hollow rotary shaft 38 is connected and driven by the operation of the clutch mechanism incorporated in the drive mechanism 33, and the inner tub 30 is rotated at a high speed to perform centrifugal spin-drying from the laundry. Then, the water is discharged into the outer tub 29 through the through hole 30a at the upper end, and is discharged out of the machine through the drain valve 34.

In each of such operations, the motor 32
The driving noise from the driving mechanism 33 mainly leaks out as noise. In the case of the washing machine 21 having this configuration, the noise upward and outside the machine is mainly caused by the top cover 2 of the housing 22.
The gap D between the cover 6 and the open / close lid 28 flows out as a path for sound waves or the like. The noise sources include, as described in the conventional example, the driving sound, the water flow sound from the stirring blade 36, the wind noise from the inner tank 30, and the vibration-proof suspension mechanism 3 in addition to the driving sound.
Mechanical vibration sound from 1;
Are generated when the airflow generated by the airflow is released from the gap D, and these are mixed to generate noise.

However, the rear lid 41 of the opening / closing lid 28 in this embodiment has a plurality of openings 50 facing the gap D and serving as entrances and exits.
8, the sound waves such as the driving sound generated inside the housing 22 flow into the gap D, that is, the sound waves entering the opening 50 from the gap d1 to the gap d2 and opening into the passage are converted into the resonance chamber 48. The energy of the sound is attenuated due to the resonance phenomenon inside, and exhibits a sound reducing effect on noise leaking upward outside the machine.

In the case of this configuration, such a sound reduction function is realized when the opening 50, which is the entrance of the sound wave, is sufficiently smaller than the depth L of the resonance chamber 48, as is apparent from FIGS.
As a λ / 4 type resonance silencer, it exhibits a sound reduction function for a specific frequency. In this case, the resonance frequency f is n = 0, 1, 2, 3,... λ (wavelength) = 1 / f In the case of (frequency), f = １ ／ L · (2n + 1), which is particularly effective for a specific frequency component by the resonance chamber 48 of the present configuration.

Incidentally, the principle of such a resonance type silencer is that, as shown in FIG. 7 (a), a sound wave from a sound source is reflected inside the cavity of the resonance part, and the reflected wave and the incident wave are the same. (B)
As shown in the waveform diagram of this figure, it becomes a sine wave of opposite phase, reduces the energy of the sound going to the outside by interfering and canceling each other, and the noise reduction effect of this type of resonance type silencer is Can be represented by

[0039]

(Equation 1)

In this case, the cross-sectional area S0 of the incident tube corresponds to the cross-sectional area having the gap d2 according to the present embodiment.
Accordingly, a sound wave generated in the housing 22 using the motor 32 or the like as a sound source passes through the gaps d1 and d2, and the resonance chamber 48 of the opening / closing lid 28 attached to the input port 27 of the top cover 26.
And the incident wave at the opening 50 facing the gap d2 cancels out and is attenuated by the interference between the reflected wave from the inside of the cavity and the noise effectively leaking from the gap d2 to the upper part of the washing machine 21. Sound.

In the present embodiment, in particular, referring to the schematic diagram of this configuration shown in FIG. 8, since the cavity of the resonance chamber 48 is large, the sound wave incident from one small opening 50 is indicated by an arrow. As described above, in the resonance chamber 48, the reflection spreads in multiple directions and multiple reflections occur, and the attenuation frequency is generated multiple times. Therefore, as shown in the characteristic diagram of FIG. However, the noise reduction effect is obtained over a wide range of the corresponding frequencies f0 to fn, which is advantageous when dealing with noise from many sound sources having different frequencies.

Incidentally, in this embodiment, the noise level was measured by performing an experiment in a dehydration operation with no load, and
As shown in the spectrum analysis diagram of FIG. 9, the noise level at 0.5 meters above the barrel top cover 26 is clearly lower than that of the conventional configuration shown by the broken line (opening / closing lid 12 shown in FIG. 13). Was confirmed to play.

In the case of a device that handles water, such as the washing machine 21 of the present embodiment, it is naturally easy for water to scatter during work.
At the time of the dehydration operation, the water that has been centrifugally dehydrated and discharged vigorously becomes a mist, and together with the air flow generated by the rotation of the inner tank 30,
Even when the opening / closing lid 28 is in the closed state (closed state), the lid 28 enters the resonance chamber 48 from the opening 50 through the gap D. However, since the bottom plate 52 of the resonance chamber 48 is inclined downward particularly toward the opening 50 as shown in FIG. 5, the water that has entered is quickly drained from the opening 50 without collecting.

Further, as described above, since the gap D from which noise leaks out of the machine can be used to reduce the noise, the housing 22 can be closed even when the cover 28 is closed. The inside and the outside communicate with each other through the gap D, and the air permeability is always maintained. Therefore, the moisture evaporation in the casing 22 such as the inner tank 30 and the outer tank 29 easily flows from the gap D to the outside of the machine. It is possible to prevent the mold from being discharged and to generate mold or an unpleasant odor inside the housing 22, which is hygienic.

In this embodiment, the resonance chamber 4 having a hollow container shape is used.
8 is attached by elastic engagement between a projection 53 protruding from the rear lid 41 and a recess 54 formed in the bottom frame 47, so that it can be easily manufactured and provided, and if necessary, a user can provide it. The bottom frame 47 can be removed for cleaning or the like, and can be kept hygienic over a long period of use. However, the present invention is not limited to such attachment means. For example, a configuration may be used in which an adhesive is used in combination, or the degree of adhesion is increased by ultrasonic welding to increase the degree of adhesion, thereby more reliably preventing sound wave leakage. .

In addition, in this embodiment, the bottom frame 47 having the bottom plate portion 52 and the peripheral side wall 49 is attached to the rear cover 41 in order to form the resonance chamber 48. It is also possible to directly join the flange portion 43 of the rear lid 41 to a single plate of the portion 52 to form a hollow resonance chamber 48 inside.

FIGS. 10 to 12 show the second to third embodiments of the present invention.
The same parts as those in the embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
Only different parts will be described.

(Second Embodiment) First, FIGS.
Reference numeral 1 denotes a second embodiment of the present invention. In the first embodiment, the single resonance chamber 48 is used. On the other hand, the resonance chamber 57 of this embodiment is a small resonance chamber 57a divided into a plurality of sections. The remaining configuration is the same as that of the first embodiment. That is, FIG. 10 shows the bottom frame 5 forming the resonance chamber 57.
8, the bottom frame 58 of the present configuration has a plurality of openings 5.
0 is divided by a plurality of partition plates 59 so as to divide it into an appropriate number (two units in this configuration), and four small resonance chambers 57a are formed in the illustrated example, and the partition plate 59 is an inclined bottom plate. The partition plate 59 can be easily formed by being integrally formed upright from the part 60, and the upper end of the partition plate 59 is joined to the back surface of the rear lid 41.

According to such a configuration, sound waves from the motor 32 or the like as sound sources enter the small resonance chambers 57a through the openings 50, and generate a resonance phenomenon based on the same principle as described in the first embodiment. The noise attenuated and leaking out of the machine from the gap D can be reduced. In this case, since the resonance chamber 57 has a small cavity divided into a plurality of small resonance chambers 57a by the partition plate 59, the sound wave incident from the opening 50 as shown in the schematic diagram of FIG. As shown in the drawing, the expansion in multiple directions is restricted by the partition plate 59 in the resonance chamber 57a, and the deviation of reflection hardly occurs. Therefore, as shown in the characteristic diagram of FIG. This is effective for the damping action approximated to the frequency, and is advantageous when dealing with noise focused on a specific frequency f0.

However, in this configuration, when the cavity shape and size of each small resonance chamber 57a are the same, a remarkable damping effect is exhibited for a specific frequency, and different configurations are used. In this case, it is possible to expect an attenuation effect in a range where the frequency width is slightly widened accordingly. Of course, it is possible to easily obtain a desired sound reduction effect by arbitrarily combining these. As described above, also in the present embodiment, it is possible to effectively reduce the noise leaking forward from the driving sound source such as the motor 26 to the outside of the apparatus. In addition, a small resonance chamber 57 obtained by dividing the resonance chamber 57 into a plurality of parts by a partition plate 59.
Since a is formed, the rigidity of the rear lid 41 of the opening / closing lid 28 is increased, and a sufficient reinforcing effect is obtained in terms of strength, particularly against dent deformation when pressed from above.

(Third Embodiment) FIG. 12 shows a third embodiment of the present invention, which is the same as the first embodiment (see FIG. 6) except for the rear periphery of the bottom frame 47 having the opening 50. The side wall 49a is substantially vertical when the opening / closing lid 28 is in a closed state so as to form a rectangular parallelepiped, whereas the rear peripheral side wall 62a of the peripheral side wall 62 of the bottom frame 61 in this embodiment is particularly In this configuration, the chamfer is applied so as not to cause resistance. More specifically, as shown in the figure, a rear peripheral side wall 62a is formed by chamfering a corner (A portion in the figure) of the bottom frame 61 constituting the resonance chamber 48 with respect to the airflow flowing from the gap d1 to the gap d2. In addition, in the present configuration, an arc-shaped surface (streamline type) is formed facing the gap D, and further, the outer opening edge (portion B in the drawing) of the opening 63 serving as the entrance is chamfered.

As described above, since the corner (A) of the rear peripheral side wall 62a facing the gap D and the opening edge (B) of the opening 63 are chamfered, Since the air flow smoothly flows through the gap D, the generation of noise due to the turbulent flow can be suppressed, and the wind noise caused by the air flow released from the gap D is attenuated in the resonance chamber 48. According to this, it works more effectively as a noise reduction effect for various noises leaking out of the machine.

The present invention is not limited to the embodiments described above and shown in the drawings. The embodiments may be arbitrarily combined and implemented. For example, the opening / closing lid is not limited to the folding structure. Not only that the lid may have a single configuration, but also the shape and size of the cavity resonance chamber may be set to obtain a desired sound reduction effect in an appropriate form suitable for practical use. The present invention can be applied to not only a machine but also a dishwasher and the like, and can be carried out with appropriate modifications without departing from the gist of the present invention in practical use.

[0054]

As described above, according to the present invention, the opening / closing lid attached to the upper portion of the housing is formed in a hollow container shape, and the resonance chamber having a sound deadening function having a hollow inside is provided. It is possible to provide a washing machine capable of attenuating the energy of sound that is about to leak out of the machine from the vicinity of the opening / closing lid in the resonance chamber, thereby reducing noise upward outside the machine and reducing noise during operation. .

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional side view of an upper half of a washing machine according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view showing the entire configuration of the washing machine.

FIG. 3 is an exploded perspective view of an opening / closing lid in an upper half part.

FIG. 4 is an exploded perspective view of the opening / closing lid.

FIG. 5 is a sectional view taken along line YY of FIG. 4;

FIG. 6 is an enlarged sectional view of a main part.

7A is a principle diagram of a silencer, and FIG. 7B is a waveform diagram.

8A is a schematic diagram, and FIG. 8B is a characteristic diagram.

FIG. 9 is a spectrum analysis diagram of actually measured noise levels.

FIG. 10 is a perspective view of a bottom frame showing a second embodiment of the present invention.

FIG. 11 is a diagram corresponding to FIG. 8;

FIG. 12 is a view corresponding to FIG. 6, showing a third embodiment of the present invention.

FIG. 13 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

21 is a washing machine, 22 is a housing, 23 is an outer box, 26 is a top cover, 27 is a slot (communication port between inside and outside), 28 is an opening / closing lid,
29 is an outer tank, 30 is an inner tank, 32 is a motor, 33 is a drive mechanism, 39 is a recess, 40 is a front lid, 41 is a rear lid, and 47 and 5
8, 61 are bottom frames, 48 and 57 are resonance chambers, 50 and 63 are openings (entrances and exits), 52 and 60 are bottom plates, 53 is a protrusion, 5
4 is a concave portion, 55 is a hinge shaft, 56 is a hinge piece, and 59
Indicates a partition plate.

Claims (7)

[Claims] 1. A device having a drive mechanism such as a motor inside a housing and an opening / closing lid for opening / closing an inside / outside communication port on an upper portion of the housing, wherein the opening / closing lid is formed in a hollow container shape, A cleaning device comprising a resonance chamber having a hollow interior. 2. The cleaning apparatus according to claim 1, wherein the resonance chamber has an entrance and exit facing a gap formed between the resonance chamber and the housing in a closed state. 3. The cleaning apparatus according to claim 2, wherein the entrance and exit of the resonance chamber are formed by a plurality of openings. 4. The cleaning apparatus according to claim 2, wherein the resonance chamber is chamfered with respect to an air flow passing through a gap formed between the resonance chamber and the housing in a closed state. 5. The cleaning apparatus according to claim 2, wherein the resonance chamber has a bottom plate that is inclined downward toward the entrance when the lid is closed. 6. The cleaning apparatus according to claim 1, wherein the resonance chamber has a small resonance chamber partitioned into a plurality of sections by a partition plate. 7. The cleaning apparatus according to claim 1, wherein the resonance chamber has a configuration in which the opening / closing lid and the bottom plate are connected and fixed by elastic engagement means with a predetermined space.