JP2868688B2 - Drum type washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine for washing, rinsing and centrifugal spin-drying of laundry.

[0002]

2. Description of the Related Art A conventional drum-type washing machine and a vibration-damping damper are configured as shown in FIGS.

In FIG. 1, reference numeral 1 denotes a drum, which has a large number of water passage holes 2 provided on an outer peripheral portion thereof. Reference numeral 3 denotes a water tank that contains the drum 1 and stores washing water. Reference numeral 4 denotes a motor for rotating and driving the drum 1, reference numeral 5 denotes a horizontal shaft having one end fixed to the rotation center of the drum 1, reference numeral 6 denotes a drum pulley provided at the other end of the horizontal shaft 5, reference numeral 7 denotes a belt connecting the motor 4 and the drum pulley 6. It is. 8
Is a spring for suspending the water tank 3 from the main body 9, and 10 is a weight provided on the water tank 3 for reducing vibration during dehydration.
11 is an anti-vibration damper for attenuating the vibration of the water tank 3,
More specifically, as shown in FIG. 11, a cylinder 12, a piston 14 having a sliding member 13, and a piston rod 1
5 and mounting members 16 and 17 for mounting to the water tank 3 and the main body 9.

In the above construction, the drum 1 is rotated at a low speed by the motor 4 during the washing process, and the laundry in the drum 1 is lifted and dropped on the water surface for washing. The rinsing step is performed in the same manner as the washing step. In the dehydration step, the drum 1 is rotated at a high speed to dehydrate the clothes.
At this time, if the clothes in the drum 1 are shifted, that is, imbalance occurs, the drum 1 and the water tank 3 vibrate.
The vibration amplitude is reduced by using the vibration damper 11 having a very large damping force.

[0005]

In the above-mentioned conventional drum type washing machine, when the clothes in the drum 1 are deviated during dehydration, the water tub 3 vibrates greatly. In particular, the water tank 3 vibrates extremely greatly due to resonance at the time of starting dehydration. The shock absorbing capacity of the conventional vibration damper 11 needs to be very large in order to prevent excessive vibration of the water tank 3 and suppress it to a predetermined vibration or less even with respect to a possible maximum imbalance of clothes.
Therefore, in the dehydration process, the vibration of the water tank 3 is directly transmitted to the main body 9 via the vibration isolation damper 11 due to the extremely large damping force of the vibration isolation damper 11 during the predetermined spinning rotation.
In addition, large vibrations are transmitted to the floor where the washing machine is installed. As a result, the floor surface vibrates greatly, and in a wooden house, the entire house starts to vibrate, giving the user discomfort, and there is a serious problem in terms of noise.

Accordingly, the present invention provides a drum type washing machine provided with a vibration damper for preventing vibration from being transmitted to the floor surface and also preventing noise while suppressing the resonance amplitude at the start of spin-drying rotation and the vibration amplitude at the time of abnormality. The primary purpose is to provide

A second object of the present invention is to provide a drum type washing machine having a vibration damper for effectively reducing the transmission of vibration to the floor while suppressing the resonance amplitude at the start of the spinning rotation.

A third object of the present invention is to provide a drum type washing machine having an anti-vibration damper capable of preventing the generation of an impact sound from the anti-vibration damper while suppressing the resonance amplitude at the start of the spin-drying rotation.

[0009]

In order to achieve the first object, a drum type washing machine according to the present invention is provided with a water tub for storing washing water, a main body for housing the water tub, and a water tub between the water tub and the main body. And a vibration damper for suppressing vibration of the water tank. The vibration damper has a cylindrical cylinder and a first sliding member that freely slides in the cylinder and generates a predetermined buffering force. Relative movement of 1st piston and 1st piston
Piston rod that penetrates freely and transmits vibration
And pistons on both axial sides of the first piston
And a second piston for limiting the first piston movement is secured to the rod in a predetermined range, the the second piston provided with a second sliding member which generates a predetermined damping force Things.

According to a second aspect of the present invention, there is provided a drum type washing machine according to the present invention, wherein a water tub for storing washing water, a main body accommodating the water tub, and a vibration tub provided between the water tub and the main body. And a first piston having a cylindrical cylinder, a first piston having a first sliding member that slides freely in the cylinder and generates a predetermined cushioning force, Penetrates the first piston so as to be relatively movable
Piston rod and, is fixed to the first, respectively the piston rod in the axial direction on both sides of the piston to transmit vibrations with
Second limiting the movement of the first piston in a predetermined range is
And the second piston has a predetermined looseness.
A second sliding member for generating an impact is provided, and the first piston is provided with a conduction path for conducting air on both axial sides of the first piston.

According to a third aspect of the present invention, there is provided a drum type washing machine according to the present invention, wherein a water tub for storing washing water, a main body for housing the water tub, and a water tub provided between the water tub and the main body are provided. And a first piston having a cylindrical cylinder, a first piston having a first sliding member that slides freely in the cylinder and generates a predetermined cushioning force, Penetrates the first piston so as to be relatively movable
Piston rod and, is fixed to the first, respectively the piston rod in the axial direction on both sides of the piston to transmit vibrations with
Second limiting the movement of the first piston in a predetermined range is
Of and a piston, wherein the second piston is provided with a second sliding member for generating a predetermined damping force, the first piston abutting shape in the second line contact state and a piston It is formed.

[0012]

In the drum type washing machine, when the spinning speed of the drum is gradually increased after the dehydration step is started and the drum is brought into a resonance state, the vibration amplitude of the water tank becomes maximum. Thereafter, as the rotation speed of the drum increases, the vibration amplitude of the water tank gradually decreases and becomes minimum when the predetermined rotation speed is reached.

A drum type washing machine according to a first aspect of the present invention has a first piston which generates a buffering force and slides freely in a cylinder, and a movement of the first piston provided on both axial sides of the first piston. Is limited to a predetermined range, and a vibration damper having a second piston having a piston rod for transmitting vibration is provided. the piston and the second piston together generate a large damping force motion, it is possible to prevent the excessive resonant amplitude. When the vibration amplitude of the water tank falls within a predetermined range in which the second piston moves freely, such as at the time of predetermined spinning, the second piston generates only a predetermined extremely small buffering force, and the actual protection is prevented. Vibration transmitted to the main body or the floor via the vibration damper can be greatly reduced. Further, since the second piston is provided with the second sliding member, when the vibration amplitude at the time of resonance is large, its buffering force becomes the sum of the buffering forces generated by the first and second pistons. When the vibration amplitude at the time of resonance is large, the first piston collides with the second piston, and the second piston also has a predetermined cushioning force. Therefore, the collision speed can be reduced, and the noise at the time of collision can be reduced.

Further, when the vibration amplitude of the water tank falls within a predetermined range in which the second piston freely moves, such as at the time of predetermined dehydration rotation, the second piston compresses air in the cylinder of the vibration damper. An air spring phenomenon occurs. For this reason, there is a limit in reducing the vibration transmitted to the floor surface during the predetermined spinning operation.

Therefore, the drum type washing machine according to the second aspect of the present invention is provided with a vibration-proof damper having a first piston provided with a conduction path for conducting air on both axial sides of the first piston. The air spring phenomenon can be eliminated, and the vibration transmitted to the floor surface can be further reduced.

When the vibration amplitude at the time of resonance is large, the first piston frequently collides with the second piston, and when both pistons come into surface contact, a loud impact noise is generated.

Therefore, in the drum type washing machine of the third aspect of the present invention, the impact noise of both pistons can be suppressed by forming both pistons in linear contact.

[0018]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 18 denotes a drum type washing machine main body, 19 denotes a clothes input lid provided on the front surface of the main body 18 so as to be openable and closable, 20 denotes a water tank containing a drum 21 and stores washing water, and 22 denotes a tub. Water passage holes 23 provided on the outer periphery of the drum 21;
Is a horizontal shaft that penetrates the water tank 20 and has one end fixed to the rotation center of the drum 21; 24, a drum pulley provided at the other end of the horizontal shaft 23; 25, a motor for driving the drum pulley 24;
Is a belt connecting the motor 25 and the drum pulley 24,
27 is a spring for suspending the water tank 20 from the main body 18;
Reference numeral 8 denotes a weight for suppressing vibration of the water tank 20, reference numeral 29 denotes a heater for heating the washing water, and reference numeral 30 denotes an anti-vibration damper provided between the water tank 20 and the main body 18 to attenuate the vibration. As shown in FIG. An anti-vibration damper 30 includes a cylindrical cylinder 31, a first piston 33 having an outer peripheral surface having a first sliding member 32 that slides freely in the cylinder 31 and generates a predetermined cushioning force, A second piston 34 for restricting the movement of the first piston 33 to a predetermined range on both sides of the piston 33, and a piston rod 35 for transmitting vibration to one end of the second piston 34,
The second piston 34 is provided with a second sliding member 36 for generating a predetermined buffering force on the outer peripheral surface. L in FIG. 4 is a predetermined distance at which the second piston 34 can move freely, that is, a play allowance. Accordingly, when the vibration amplitude is equal to or less than the play allowance L, the cylinder 31 and the first piston 33 move integrally and do not generate a large cushioning force. When the vibration amplitude is equal to or greater than the play allowance L, the cylinder 31 and the first piston 33
Slides and generates a large cushioning force. In the present embodiment, the play allowance L is set to be larger than the amplitude when the drum is in the constant rotation for dehydration. The body 18 is attached to one end of the piston rod 35.
The cylinder 31 has an attachment member 38 attached to the water tank 20 at an end thereof. Reference numeral 39 denotes a cushioning material made of soft urethane or the like provided on the second piston 34, and reduces shock and noise when the first piston 33 hits the second piston 34. Reference numeral 40 denotes a control device, which includes a motor 25, a heater 29,
And other controls.

Next, the operation of this embodiment will be described.

When washing is started, a predetermined amount of water is supplied to the water tub 20, and the heater 29 is energized until the temperature reaches a predetermined temperature. At this time, the drum 21 is driven to rotate at a low speed by the motor 25, and lifts and drops the clothes in the drum 21 to perform washing. After the washing process, the washing water is drained and rinsed a predetermined number of times, and the rinsing process ends.

In the dehydration step, the drum 21 is driven to rotate at a high speed by a motor 25 to perform centrifugal dehydration of clothes. In the resonance state (200 rpm to 300 rpm) at the start of dehydration, the vibration amplitude becomes very large, and usually vibrates at an amplitude of about 20 mm. In a normal rotation (800 to 1400 rpm) state of dehydration, the vibration amplitude is 5 mm or less.

In the vibration damper of this embodiment, at the time of resonance,
The first piston 33 moves with the vibration of the water tank 20, and a large damping force is generated between the first sliding member 32 and the cylinder 31, thereby preventing the vibration amplitude from excessively increasing at the time of resonance. At this time, the relationship between the friction load acting on the vibration damper of this embodiment and the stroke of the piston is as shown in FIG. 5, the second piston 34 is provided with the second sliding member 36, so that when the vibration amplitude at the time of resonance is large, the cushioning force is generated by the first and second pistons. And the vibration at the time of resonance can be further reduced.
Further, when the vibration amplitude at the time of resonance is large, the first piston 33 collides with the second piston 34. Since the second piston 34 also has a predetermined buffering force, the collision speed can be reduced. In addition, noise at the time of collision can be reduced.

Further, when the rotation speed of the drum reaches a predetermined dehydration rotation speed in the steady state of dehydration, the vibration amplitude of the water tank becomes approximately 5 mm or less. Therefore, according to the anti-vibration damper of the present embodiment, the first piston 33 vibrates together with the cylinder 31, and the second sliding member 36 provided on the cylinder 31 and the second piston 34 slides to a predetermined weakness. It becomes a buffering force, and it is possible to greatly reduce the vibration transmitted to the floor via the vibration damper. At this time, the relationship between the friction load acting on the vibration damper of this embodiment and the stroke of the piston is as shown in FIG.

Next, an embodiment of the second invention will be described.

In FIG. 7, the same components as those in the embodiment of the first invention are denoted by the same reference numerals, and detailed description is omitted. Reference numeral 41a denotes a conduction path provided on the first piston 33 for conducting air on both sides of the first piston 33.

The operation of this embodiment will be described.

The vibration amplitude of the water tank 20 during a predetermined spinning rotation is within a predetermined range in which the second piston 34 can freely move (play allowance L).
When the pressure falls within the range, the second piston 34 compresses the air in the cylinder 31 of the vibration damper 30 and a phenomenon of an air spring occurs. For this reason, there is a limit in reducing the vibration transmitted to the floor surface during the predetermined spinning operation. In this embodiment, the conduction path 41
Is provided, the air spring phenomenon can be eliminated, and the vibration transmitted to the floor via the vibration damper 30 can be further reduced.

FIG. 8 shows another embodiment of the second invention, in which the center hole of the first piston 33 is formed larger than the piston rod 35, and the first piston 3 is located between the two.
3 are formed with conducting paths 41a for conducting air on both sides. In this embodiment, as in the previous embodiment, the air path phenomenon can be eliminated by the conduction path 41a, and the vibration transmitted to the floor surface via the vibration damper 30 can be further reduced.

Next, an embodiment of the third invention will be described.

In FIG. 9, the same components as those in the first and second embodiments of the invention are denoted by the same reference numerals, and detailed description is omitted. Reference numeral 51 denotes an annular protrusion for line contact provided so that both axial end surfaces of the first piston 33 project toward the second piston 34, respectively. Reference numeral 52 denotes a first piston which is different from the annular projection 51 in a radial direction on a surface of each second piston 34 facing the first piston 33.
And an annular projection for line contact provided so as to project toward the piston 33.

The operation of this embodiment will be described.

When the vibration amplitude at resonance is large, the first
The piston 33 frequently collides with the second piston 34, but in the present embodiment, the two pistons 33, 34 are in line contact at different positions in the radial direction by the annular projections 51, 52. , 34 can reduce the impact noise.

Further, in this embodiment, when the vibration amplitude of the water tank 20 falls within a predetermined range (play allowance L) in which the second piston 34 moves freely during the predetermined dehydration rotation, FIG.
As in the embodiment shown in FIG. 7, the air path phenomenon can be eliminated by the conduction path 41a, and the vibration transmitted to the floor via the vibration damper 30 can be further reduced.

The present invention is not limited to the above embodiments, but can be modified as required. For example, by providing an O-ring inside a second sliding member 36 provided on the outer peripheral surface of the second piston 34, the second sliding member 3
6 may be urged toward the cylinder 31 side.

[0036]

As described above, the drum type washing machine of the present invention is provided with the vibration damper having the first piston and the second piston and having a predetermined play allowance that does not transmit vibration. In a large resonance vibration equal to or larger than a predetermined range at the start of rotation, both the first piston and the second piston move to generate a large damping force, thereby preventing an excessive resonance amplitude. When the vibration amplitude of the water tank falls within a predetermined range in which the second piston moves freely, such as at the time of predetermined spinning, the second piston generates only a predetermined extremely small buffering force, and the actual protection is prevented. Vibration transmitted to the main body or the floor via the vibration damper can be greatly reduced. Also,
Since the second piston is provided with the second sliding member,
In the case where the vibration amplitude at the time of resonance is large, the buffering force becomes the sum of the buffering force generated by the first and second pistons, so that the vibration at the time of resonance can be further reduced and the vibration amplitude at the time of resonance is large. In this case, the first piston collides with the second piston. However, since the second piston also has a predetermined buffering force, the collision speed can be reduced, and the noise at the time of collision can be reduced.

Further, the drum type washing machine of the present invention
Is provided with a vibration isolating damper provided with a conduction path for conducting air on both sides in the axial direction of the first piston.
The phenomenon of the air spring when the piston falls within a predetermined range in which the piston freely moves can be eliminated, and the vibration transmitted to the floor can be further reduced.

Further, in the drum type washing machine of the present invention, by forming the first piston and the second piston into a line-contacting shape, the first piston can be moved to the second piston when the vibration amplitude at resonance is large. Even when the pistons frequently collide with the second piston, the impact noise of both pistons can be further reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a drum type washing machine according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the drum type washing machine.

FIG. 3 is a detailed sectional view of an anti-vibration damper of the drum type washing machine.

FIG. 4 is a detailed cross-sectional view of a main part of an anti-vibration damper of the drum type washing machine.

FIG. 5 is a characteristic diagram showing the relationship between the friction load of the vibration damper and the stroke of the piston when the vibration amplitude at resonance is large.

FIG. 6 is a characteristic diagram showing a relationship between a friction load of a vibration damper and a stroke of a piston during a predetermined spin-dry rotation.

FIG. 7 is a detailed sectional view of a main part of an anti-vibration damper of a drum type washing machine according to another embodiment of the present invention.

FIG. 8 is a detailed sectional view of a main part of an anti-vibration damper of a drum type washing machine according to still another embodiment of the present invention.

FIG. 9 is a detailed sectional view of a main part of an anti-vibration damper of a drum type washing machine according to still another embodiment of the present invention.

FIG. 10 is a side sectional view showing a drum type washing machine in a conventional example.

FIG. 11 is a sectional view of an anti-vibration damper of the drum type washing machine.

[Explanation of symbols]

 18 Body 20 Water tank 22 Drum 30 Vibration damper 31 Cylinder 33 First piston 34 Second piston 35 Piston rod 39 Buffer material 40 Control device 41, 41a Conduction path 51, 52 Annular protrusion for line contact

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumimasa Mori 3-30-1, Horikiri, Katsushika-ku, Tokyo Inside Arai Seisakusho Co., Ltd. (72) Inventor Seiji Kojima 3-3-1, Horikiri, Katsushika-ku, Tokyo (56) References JP-A-4-371195 (JP, A) JP-A-4-364894 (JP, A) JP-A-6-63291 (JP, A) JP-A-4-36991 (JP) , U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) D06F 37/20-37/24 D06F 49/06 F16F 9/00-9/50

Claims (3)

(57) [Claims] 1. A water tank for storing washing water, a main body accommodating the water tank, and a vibration damper provided between the water tank and the main body to suppress vibration of the water tank, wherein the vibration damper has a cylindrical shape. A cylinder, a first piston having a first sliding member that slides freely in the cylinder and generates a predetermined cushioning force, and a first piston that penetrates the first piston so as to be relatively movable.
And a piston rod for transmitting vibration to the first piston.
And a second piston for limiting the first piston movement is fixed in the axial direction respectively on both sides the piston rod in a predetermined range, the the second piston second for generating a predetermined damping force Drum type washing machine provided with the sliding member of the above. 2. A water tank for storing washing water, a main body accommodating the water tank, and a vibration damper provided between the water tank and the main body to suppress vibration of the water tank, wherein the vibration damper has a cylindrical shape. A cylinder, a first piston having a first sliding member that slides freely in the cylinder and generates a predetermined cushioning force, and a first piston that penetrates the first piston so as to be relatively movable.
And a piston rod for transmitting vibration to the first piston.
And a second piston for limiting the first piston movement is fixed in the axial direction respectively on both sides the piston rod in a predetermined range, the the second piston second for generating a predetermined damping force A drum type washing machine provided with a sliding member according to (1), wherein the first piston is provided with a conduction path for conducting air on both axial sides of the first piston. 3. A water tank for storing washing water, a main body accommodating the water tank, and a vibration damper provided between the water tank and the main body to suppress vibration of the water tank, wherein the vibration damper has a cylindrical shape. A cylinder, a first piston having a first sliding member that slides freely in the cylinder and generates a predetermined cushioning force, and a first piston that penetrates the first piston so as to be relatively movable.
And a piston rod for transmitting vibration to the first piston.
And a second piston for limiting the first piston movement is fixed in the axial direction respectively on both sides the piston rod in a predetermined range, the the second piston second for generating a predetermined damping force A drum-type washing machine provided with the sliding member of (1) and formed in a shape in which the first piston and the second piston abut on each other in a line contact state.