JP2019208965A - Washing machine - Google Patents

Abstract

To reduce noise which has relatively low frequency of equal to or less than 1 kHz that leaks from a gap between a housing and a floor surface of a washing machine.SOLUTION: A washing machine includes: an outer tub 10; an inner tub 8 which is a washing and dewatering tub provided in the outer tub 10 in a rotatable manner; a motor 13 for rotationally driving the inner tub 8; a housing 1 for storing the outer tub 10; a base 3 mounted at a lower part of the housing 1; and a muffler 101 arranged between the base 3 and the outer tub 10. The muffler 101 includes an opening part at one end and a closed part at the other end. The opening part is arranged on the base 3 side or the central side of the housing 1 with respect to the closed part, and the length between the opening part and the closed part is 1/4 of the noise wavelength, the cross sectional shape is a cylindrical or a rectangular shape, and the inside is hollow.SELECTED DRAWING: Figure 3

Description

The present invention relates to a washing machine for washing clothes and the like.

  The vertical washing machine is a washing machine that performs washing of clothes by rotating a pulsator at the bottom of the inner tub and dehydrating clothes by rotating the inner tub at a high speed. In the vertical washing machine, in recent years, there is an increasing need for noise reduction from the viewpoint of comfort. Various inventions have been made so far for reducing noise in vertical washing machines, particularly for reducing noise by resonance and phase control.

  For example, Patent Document 1 discloses that for a vertical washing machine, a resonator type silencer is attached to the lower surface of the casing of the vertical washing machine to reduce noise leaking from below. Has been. Japanese Patent Application Laid-Open No. H10-228561 discloses that for a vertical washing machine, noise reduction is achieved by attaching an inflatable silencer to the bottom of the main body of the vertical washing machine.

Japanese Patent Laid-Open No. 2000-296991 Japanese Patent Laid-Open No. 2002-253898

  However, in Patent Document 1 and Patent Document 2, since the silencer is installed in a narrow space on the floor surface from the lower surface of the housing, there is a restriction in the height direction of the washing machine of the size of the silencer, Although effective against high frequencies, it is considered difficult to achieve effects against low frequencies.

  The present invention has been improved in view of the above points, and a main object of the present invention is to reduce noise having a relatively low frequency of 1 kHz or less that leaks from a gap between the casing of the washing machine and the floor surface. It is to reduce.

To achieve the above object, the washing machine of the present invention contains an outer tub, an inner tub that is a washing and dewatering tub provided rotatably in the outer tub, a motor that rotationally drives the inner tub, and an outer tub A base that is attached to a lower portion of the case, and a silencer disposed between the base and the outer tub. The silencer has an opening on the base that is one end, and an opening on the other end. The length between the opening and the closing portion is ¼ of the noise wavelength, the cross-sectional shape is cylindrical or rectangular, and the inside is hollow.

  ADVANTAGE OF THE INVENTION According to this invention, the noise which has a comparatively low frequency of 1 kHz or less leaking from the clearance gap between the housing | casing of a washing machine and a floor surface can be reduced.

  Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a perspective view of a washing machine according to an embodiment of the present invention. It is right side sectional drawing which shows the internal structure of the washing machine which concerns on embodiment of this invention. It is right side sectional drawing which shows the internal structure of the washing machine of Example 1 of this invention. It is an enlarged view of the silencer periphery of Example 1 of this invention. It is bottom sectional drawing of the washing machine of Example 1 of this invention. It is right side sectional drawing which shows the internal structure of the washing machine of Example 2 of this invention. It is bottom sectional drawing of the washing machine of Example 2 of this invention. It is right side sectional drawing which shows the internal structure of the washing machine of Example 3 of this invention. It is bottom sectional drawing of the washing machine of Example 3 of this invention. It is right side sectional drawing which shows the internal structure of the washing machine of Example 4 of this invention. It is bottom sectional drawing of the washing machine of Example 4 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<Example 1>
FIG. 1 is a perspective view of a washing machine according to an embodiment of the present invention, and FIG. 2 is a right side cross-sectional view showing the internal structure of the washing machine according to the embodiment of the present invention.
As shown in FIG. 1, the washing machine 100 includes a housing 1 that forms an outer shell, a top cover 2 is provided on the top of the housing 1, and a base 3 is provided on the bottom of the housing 1. The base 3 is provided with four legs, and an adjustment leg 3a capable of height is provided at one position on the right front side of the washing machine main body, and the remaining three positions are height adjustments. The fixed leg 3b which cannot perform is provided. When installing the washing machine, the inclination and backlash of the main body are adjusted by adjusting the height of the adjusting legs 3a. Further, the top cover 2 is provided with an outer lid 2b so as to cover the clothing insertion opening 2a. On the front side of the top cover 2, an operation panel 7 including a power switch 4, an operation switch 5, and a display 6 is provided. The operation panel 7 is electrically connected to a control device 14 provided on the back surface of the housing 1.
Inside the housing 1, an outer tub 10 for storing water is elastically supported by the housing 1 through suspension bars at four corners. An air trap 21 a is provided on the rear surface of the outer tub 10, and the internal pressure is transmitted to the water level sensor 21 via the tube 21 b to detect the water level accumulated in the outer tub 10. A safety switch 31 is provided at the front corner of the housing 1 so that when the outer tub 10 vibrates during dehydration, a detection is made when the vibration displacement exceeds a predetermined vibration displacement.
The outer tub 10 includes an inner tub 8 for storing clothing. The inner tank 8 has a large number of small through holes 8a for water flow and ventilation on the outer peripheral wall thereof, and a plurality of through holes 8b for water flow and ventilation on the bottom wall thereof, and a fluid at the upper edge thereof. A balancer 9 is provided, and a rotating blade 11 is rotatably supported inside the bottom.
A motor 13 is provided outside the bottom of the outer tub 10, and the rotation of the inner tub 8 and the rotary blade 11 can be operated as follows by controlling the clutch mechanism 12. One is an operation of rotating the rotating blade 11 repeatedly forward and reverse in a state where the inner tub 8 is locked so as to be stationary or released so that it can freely rotate, and is mainly used when clothes are agitated. The other is an operation in which the inner tub 8 and the rotary blade 11 are rotated together in the same direction, and is mainly used for dehydration.

A tank cover 23 is provided on the upper surface of the outer tub 10, and the tank cover 23 includes a clothing input port 23a having a circular opening for charging clothing, a hot air outlet 23b, and a water supply inlet 25a. Further, the tank cover 23 is provided with an inner lid 24 so as to cover the clothing insertion opening 23a, and can be opened and closed by a hinge 24a. The inner lid 24 is unlocked and opened by lifting the handle 24b upward, and is locked by pushing downward.
A drying duct 10 c is provided on the rear side of the outer tub 10. The drying duct 10c is connected to the drying unit 19 through the bellows 10d. The drying unit 19 includes a heater 19b that is a heat source of the blower fan 19a and a temperature sensor 19c. The drying unit 19 is connected to a hot air outlet 23b provided in the tank cover 23 via a bellows 23c. The clothes are dried by circulating the air whose temperature has been raised by the heater 19b from the blower fan 19a. Further, the housing 1 is provided with a water supply electromagnetic valve 25 connected to the water supply port 2c so that water can be supplied to the inner tank 8 and the drying duct 10c. A drain port 10 b for draining is provided in the lower part of the outer tub 10, and a drain hose 24 is connected via a drain valve 15.

  FIG. 3 is a right side sectional view showing the internal structure of the washing machine according to the first embodiment of the present invention.

  As shown in the figure, in the present invention, a cross section is provided between the base 3 and the outer tub 10 and between the housing 1 and the outer tub 10 at the bottom surface of the housing 1 (the peripheral end of the base 3). A silencer 101 having a cylindrical or rectangular shape and a hollow inside is provided, and the silencer 101 can reduce noise radiated from the bottom surface opening 201 of the housing 1. FIG. 4 shows an enlarged view around the silencer of the first embodiment of the present invention. As shown in the drawing, the silencer 101 has an opening at the lower bottom surface (one end) and a closed portion at the upper portion (the other end). The length L in the longitudinal direction of the silencer 101 from the opening surface of the opening on the bottom surface of the silencer 101, that is, the length L in the longitudinal direction of the silencer 101 is about 1/4 of the wavelength of the noise to be silenced. The silencer 101 has an opening disposed between the base 3 and the closing portion, and the longitudinal direction of the silencer 101 is substantially parallel to the wall surface of the housing 1, that is, along the direction of gravity.

  In the following, the principle of noise reduction in the silencer 101 will be described. Conventionally, noise generated in the housing 1 is radiated from the bottom opening 201 of the housing, and radiated from the gap radiation surface 203 through the gap 202 with the floor surface 301. When the silencer 101 is installed, noise passing through the gap 202 enters from the opening surface of the lower bottom opening of the silencer 101 and is reflected by the closed surface of the upper opening. The reflected noise reaches the opening surface of the lower bottom surface, and at that time, it collides with noise transmitted from the gap 202 and causes interference. Since the internal length L of the silencer 101 is ¼ of the wavelength of the noise, the reflected noise and the noise transmitted through the gap are in opposite phases, so that the noises can be canceled with each other. In this way, noise radiated from the bottom opening 201 in the silencer 101 can be reduced.

  Further, according to the muffler principle, in order to reduce a relatively low frequency noise of 1 kHz or less leaking from the gap 202 between the casing 1 (including the base 3) of the washing machine 100 and the floor surface 301, the noise is reduced. The closed portion of the silencer 101 is disposed where it passes through the gap 202, and the length L of the silencer 101 is about 1/4 of the wavelength of noise to be silenced. Since the frequency is 1/4 at a low frequency (wavelength 34 cm), the length L of the silencer 101 needs to be about 8.5 cm. If it is 500 Hz, the length L needs to be about 17 cm. That is, in order to reduce relatively low-frequency noise of 1 kHz or less, the length L of the silencer 101 needs to be about 8.5 cm or more.

Such a relatively long silencer 101 is desirably arranged in a space that does not affect other configurations. For example, as in this embodiment, the base 3 and the outer tub 10 are arranged at the peripheral end of the base 3. It is desirable to arrange between them. By disposing the silencer at such a position, inhibition of the increase in the capacity of the outer tub 10 is suppressed, and leakage from the gap between the casing 1 (including the base 3) of the washing machine 100 and the floor surface is 1 kHz or less. Relatively low frequency noise can be reduced.
The frequency to be silenced is, for example, a natural frequency. In the case of a washing machine, the sound may be increased at the natural frequency of the outer tub 10. In that case, since the dominant frequency to be silenced is determined by the natural frequency of the outer tub 10, the general design of the silencer 101 becomes possible from the natural frequency.

  FIG. 5 is a bottom sectional view of the washing machine according to the first embodiment of the present invention.

  As shown in the figure, the silencer 101 has a rectangular cross section and is installed around the bottom surface of the housing 1. In this embodiment, the shape is rectangular, but the cross-sectional shape may be circular, elliptical, or polygonal. Further, in the silencer 101, only the internal length L has a limit of 1/4 of the wavelength of noise that is desired to be reduced, but there are no particular limitations on other dimensions. However, the width and diameter of the cross-sectional shape should be relatively narrow. That is, the length between the opening and the closed portion (longitudinal direction) is longer than the length in the cross-sectional direction (transverse cross-sectional direction) perpendicular to the longitudinal direction (transverse direction). The length in the surface direction is shorter than the length in the longitudinal direction). Specifically, it is desirable that the internal length in the cross-sectional direction (short direction) is not more than the internal length L between the opening and the closing portion, that is, not more than 1/4 of the noise wavelength to be reduced.

  In the present embodiment, a plurality of silencers 101 are arranged side by side along the peripheral edge of the base 3 upward from the lower surface of the base 3 at the lower part of the housing 1, so that the internal space of the housing 1 is effectively utilized. It is possible to secure the internal length L of the silencer 101 that can mute even for low frequencies of 1 kHz or less. That is, the silencer 101 can mute to a low frequency of 1 kHz or less. Further, by installing the silencer 101 on the base 3, the rigidity of the base 3 is improved, and the rigidity of the entire housing 1 to which the base 3 is attached is improved. Suppression is possible. In the present embodiment, a plurality of peripheral edges are provided side by side on the entire periphery of the base 3. However, it is not necessary to provide the entire periphery, and the left and right sides and the rear side shown in FIG. Since there are many cases where noise is reflected, the noise may be increased. Therefore, it is desirable to provide a silencer at least on the left and right sides and the rear side of the base 3.

<Example 2>
FIG. 6 is a right side sectional view showing the internal structure of the washing machine according to the second embodiment of the present invention, and FIG. 7 is a bottom sectional view of the washing machine according to the second embodiment of the present invention.

  As shown in FIG. 6, in this embodiment, the silencer 101 and the silencer 102 are provided with two types of silencers having different lengths in the longitudinal direction. Specifically, a silencer 101 (first silencer) having a predetermined length (first length) from the opening to the closing portion, and a length shorter than the first length (second Muffler 102 having a length). In this way, the internal length L of the silencer can be set differently between the silencer 101 and the silencer 102. Therefore, when the noise to be reduced has two types of frequency peaks, the internal length L is set respectively. It can be determined according to the wavelength of the peak frequency. Thereby, even when the noise to be reduced has two types of frequency peaks, the sound can be silenced. In this embodiment, there are two silencers, but a plurality of types of silencers may be provided according to the number of frequency peaks. Further, the silencer 101 and the silencer 102 of this embodiment have a rectangular cross section. In this embodiment, the shape is rectangular, but the cross-sectional shape may be circular, elliptical, or polygonal. Similarly to FIG. 3, it is installed around the bottom surface of the housing 1 (the peripheral end of the base 3). At that time, a silencer having a long internal length L is provided on the wall side of the casing 1, and a shorter silencer is provided on the center side of the casing 1 than the longer silencer, thereby providing an internal space of the casing 1. As in the first embodiment, relatively low frequency noise of 1 kHz or less can be reduced while effectively inhibiting the increase in capacity of the outer tub 10. In this embodiment, the silencer 101 is disposed on the wall side of the housing 1, and the silencer 102 is disposed on the center side of the housing 1 with respect to the silencer 101. However, the arrangement is not limited to this unless the capacity of the outer layer 10 is greatly hindered.

<Example 3>
FIG. 8 is a right side sectional view showing the internal structure of the washing machine according to the third embodiment of the present invention, and FIG. 9 is a bottom sectional view of the washing machine according to the third embodiment of the present invention.

  As shown in FIG. 8, in this embodiment, the silencer 103 has a shape in which the silencer 101 of Embodiment 1 of FIG. 3 is inclined by 90 °, and the opening surface of the silencer 103 is on the inner side (the center of the housing 1). Side), the closed surface faces the outside (the wall side of the housing 1). That is, the longitudinal direction of the silencer 103 is arranged along the bottom surface of the base 3 (substantially parallel). The principle of silencing using the silencer 103 is the same as in the first and second embodiments. As shown in FIG. 9, the cross-sectional shape of the silencer 103 has a rectangular cross section and is installed around the bottom surface of the housing 1. In addition, it arrange | positions so that the surface of the broken line of the figure may become the opening surface of the silencer 103, ie, the center side of the housing | casing 1 may become an opening part.

  Since the silencer 103 of the present embodiment has a shape in which the silencer 101 is laid down, it can be made compact in the height direction and the width direction of the washing machine. In addition, the rigidity of the base 3 is improved as in the first embodiment, and the rigidity of the entire housing 1 to which the base 3 is attached is improved. Therefore, vibrations generated in the housing 1 can be suppressed.

<Example 4>
FIG. 10 is a right side sectional view showing the internal structure of the washing machine according to the fourth embodiment of the present invention, and FIG. 11 is a bottom sectional view of the washing machine according to the fourth embodiment of the present invention.

  As shown in FIG. 10, in this embodiment, the silencer 104 has a curved shape, and the opening surface of the opening is on the inner side (center side of the housing 1), and the closing surface of the closing portion is on the upper side. Further, the opening is disposed between the base 3 and the closing portion. In this case, the internal length L is a length connecting the center of the opening surface and the closing surface. As shown in FIG. 11, the silencer 104 has a rectangular cross section, and is arranged radially around the bottom surface of the housing 1 (the peripheral edge of the base 3). In addition, although arrange | positioned radially this time, you may arrange | position along the peripheral edge part of the base 3. FIG. Even in such a case, it is necessary to provide the opening of the silencer 104 so as to face the center side of the housing 1.

  Since the silencer 104 can be curved according to the present embodiment, it can be made compact in the height direction of the washing machine as in the third embodiment, and the outer tank 10 and the motor 13 inside the housing 1 can be avoided. For example, the inside of the housing 1 can be effectively used.

DESCRIPTION OF SYMBOLS 1 Case 2 Top cover 3 Base 8 Inner tank 10 Outer tank 11 Rotary blade 12 Clutch mechanism 13 Motor 101 Silencer 102 Silencer 103 Silencer 104 Silencer 201 Bottom opening 202 Clearance 203 Clearance radiation surface 301 Floor surface

Claims (8)

An outer tank,
An inner tub that is a washing and dewatering tub provided rotatably in the outer tub;
A motor that rotationally drives the inner tank;
A housing for housing the outer tub;
A base attached to a lower portion of the housing;
A silencer disposed between the base and the outer tub,
The silencer has an opening at one end and a closing portion at the other end, and the opening is disposed on the base side or the center side of the casing with respect to the closing portion, The length between the opening and the closing portion is ¼ of the noise wavelength, the cross-sectional shape is cylindrical or rectangular, and the interior is hollow. The washing machine according to claim 1, wherein
The silencer is a washing machine in which the opening is disposed between the base and the closing portion, and the longitudinal direction of the silencer is disposed in parallel to the wall surface of the housing. A washing machine according to claim 2,
The silencer
A first silencer having a first length from the opening to the closure;
A second silencer having a second length shorter than the first length;
Having a washing machine. A washing machine according to claim 3,
The first silencer is a washing machine arranged on the wall side of the housing from the second silencer. The washing machine according to claim 1, wherein
In the silencer, the closing portion is disposed on the wall side of the housing, the opening is disposed on the center side of the housing, and the longitudinal direction of the silencer is along or parallel to the bottom surface of the base. Arranged in a washing machine. The washing machine according to claim 1, wherein
The silencer is a washing machine in which the opening is disposed between the base and the closing portion and is disposed toward the center of the housing, and the longitudinal cross-sectional shape of the silencer is a curved surface. The washing machine according to any one of claims 1 to 6,
A washing machine having a plurality of silencers. The washing machine according to any one of claims 1 to 7,
The length between the opening part and the closing part of the silencer is longer than the length of the cross section.

Images