JPH04240487A - Drum type washing machine - Google Patents

Abstract

PURPOSE:To reduce noise of a drum type washing machine by reducing vibrations of a drum during dehydration and thus reducing vibrations propagated to a floor. CONSTITUTION:A shock absorber 17 which can vary shock absorbing force is mounted between a water tank 2 which houses a drum 1 and a body 8. For a prescribed time after a dehydrating operation starts and for a prescribed time after the dehydrating operation stops, the shock absorbing force of the shock absorber 17 is set large, while during other time, the force is set small. By this, vibration amplitude of the water tank 2 can be prevented from increasing and propagation of vibrations of the water tank 2 to a floor surface can be prevented. Thus the vibrations propagated to the floor surface can be reduced, and further, noise can also be reduced.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a drum-type washing machine that washes laundry and performs centrifugal dehydration using a drum that is driven to rotate around a horizontal axis, and in particular, the present invention relates to a drum-type washing machine that is equipped with a shock absorber to reduce vibrations during dehydration. Regarding drum type washing machines.

0002

BACKGROUND OF THE INVENTION In recent years, drum-type washing machines have been attracting attention because they cause less damage to fabrics and can wash clothes while saving water. Conventionally, this type of drum-type washing machine generally had a configuration as shown in FIG.

The configuration will be explained below with reference to FIG. As shown in the figure, 1 is a drum, and a large number of water passage holes 1a are provided on the outer periphery of the drum. 2 is a water tank that houses the drum 1 and stores washing water. 3 is a motor for driving the drum 1; 4 is a horizontal shaft with one end fixed to the center of rotation of the drum 1; 5 is a drum pulley provided at the other end of the horizontal shaft 4; 6 is a link between the motor 3 and the drum pulley 5. It's a belt. 7 is a spring body that suspends the water tank 2 on the main body 8; 9 is the water tank 2;
10 is a weight provided in the water tank 2 to reduce vibrations during dewatering. Reference numeral 11 is a leg that is attached to the bottom of the aircraft body and allows for adjustment of rattling between the aircraft body and the floor.

In the above structure, during the washing process, the drum 1 is driven to rotate at a low speed by the motor 3, and the washing inside the drum 1 is repeatedly lifted and dropped, and the washing is performed by the mechanical force of this falling. During the rinsing process, rinsing is performed in the same manner as in the washing process.

[0005] During the dewatering process, the drum 1 is rotated at high speed to dehydrate the clothes.

[0006]

In such a conventional drum-type washing machine, when an imbalance occurs due to unevenness of the clothes in the drum 1, the drum 1 and the water tank 2 vibrate greatly. Since this amount of unbalance varies depending on the amount and type of clothing, conventionally, a weight 10 with a weight commensurate with the washing capacity is provided to increase the weight of the vibrating body, and a buffer is provided to absorb vibrations and reduce the vibration amplitude. was reduced.

[0007] However, in this conventional method, the weight of the vibrating body must be increased to approximately 50 kg as the washing capacity has increased to 5 kg, which inevitably increases the weight of the entire washing machine. It weighs about 100 kg, and in typical Japanese wooden houses, unless special floor reinforcement work is done, the floor vibrates and makes a lot of noise, which limits its use.

The present invention solves the above problems, and aims to provide a drum-type washing machine that reduces the vibration of the drum during dehydration operation, reduces the vibration transmitted to the floor surface on which it is installed, and has less noise. purpose.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a first means to make the buffering force of a buffer body that suppresses vibrations of a water tank variable, and to start a dehydration operation during a dehydration operation. The buffering force of the buffer is increased during a later predetermined time period and a predetermined time period after the dehydration operation is stopped, and is reduced during times other than the predetermined time period.

[0010] The second means is to vary the buffering force of a buffer body that suppresses vibrations of the water tank, and a vibration detection device that detects the magnitude of vibrations of the water tank during dewatering operation detects vibrations exceeding a predetermined value. The structure is such that the damping force of the shock absorber is increased when a vibration is detected, and is changed to be decreased when a vibration of a predetermined value or less is detected.

The third means is to make the buffering force of the buffer body that suppresses the vibration of the water tank variable, so that the rotation speed detection device that detects the rotation speed of the water tank during dewatering operation detects the rotation speed below a predetermined value. The buffering force of the buffer body is increased when a rotational speed exceeding a predetermined value is detected, and decreased when a rotational speed exceeding a predetermined value is detected.

0012

[Operation] According to the above-described structure, the present invention uses the first means to increase the buffering force of the buffer body for a predetermined time after the start of the dehydration operation and for a predetermined time after the stop of the dehydration operation. It is possible to prevent the vibration amplitude of the water tank from increasing when passing through the resonance point after the dehydration operation is stopped. Furthermore, by reducing the buffering force of the buffer during times other than the predetermined time, it is possible to prevent the vibrations of the water tank from being transmitted to the washing machine body and the floor via the buffer after passing the resonance point. .

[0013] According to the second means, the vibration detection device detects vibrations exceeding a predetermined value during the spin-drying operation, that is, when the vibration passes through a resonance point after the start of the spin-drying operation, and when the unevenness of the clothes in the drum is large. By detecting that the vibration amplitude of the tank is large and increasing the buffering force of the buffer, it is possible to prevent the vibrations of the aquarium from spreading.

[0014] Furthermore, when the vibration detection device detects vibrations below a predetermined value, that is, when the dehydration operation is steady and when the unevenness of the clothes in the drum is small, the shock absorbing force of the shock absorber is reduced. It is possible to prevent the vibrations of the water tank from being transmitted to the washing machine main body and the floor surface via the buffer.

[0015] According to the third means, when the rotation speed detection device detects the rotation speed of the drum below a predetermined value during dehydration operation, that is, the rotation speed below the resonance point, the buffering force of the buffer body is increased. Therefore, it is possible to prevent the vibration amplitude of the water tank from increasing when passing through the resonance point after the start of the dewatering operation. In addition, by reducing the buffering force of the shock absorber when the rotational speed of the drum exceeds a predetermined value exceeding the resonance point, the vibration of the water tank is transmitted through the shock absorber to the washing machine body and the floor after passing the resonance point. It is possible to prevent the information from being transmitted.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

[0017] The same parts as those shown in the conventional example are given the same reference numerals and their explanations will be omitted. 1 to 4 show a first embodiment of the present invention, and as shown in FIGS. 1 and 3, 12 is a drainage hose that communicates the water tank 2 with the pump device 13, and 14 is connected to the pump device 13. Connected to external drain with discharge hose. Reference numeral 15 denotes an electromagnetic water supply valve, which is connected to the water tank 2 via a hose. 16 is an aquarium packing, and the aquarium 2 and the main body 8 are connected to the aquarium. 17
A buffer body damps vibrations of the water tank 2 during dewatering operation, and a plurality of damping bodies are installed between the water tank 2 and the main body 8 to support the water tank 2, and the buffering force thereof is variable by switching. 18 is a weight for suppressing vibrations of the water tank 2, 19 is a heater for heating washing water, and 20 is a control device that controls the motor 3, the buffer 17, the heater 19, and other functional parts. FIG. 2 shows the detailed structure of the buffer body 17, in which 30 is a cylindrical cylinder, 31 is a cylinder receiver, which is tightly fixed to one end of the cylinder 30, and the outer surface has a mounting part formed in the water tank 2. Attachment part 3 attached to 2a
1a is formed. In addition, a hollow cylindrical portion 31 is provided on the inner surface.
b is formed.

A cylinder bearing 32 is tightly fixed to the other end of the cylinder 30.
A cylinder packing 33 is attached to the outer surface of the cylinder.

A piston 34 is formed in a hollow shape with one end open, and the open end 34a is connected to the hollow cylindrical part 31.
b is slidably fitted. Two flange portions 34b are formed approximately at the center of the piston 34, and the flange portions 34b
A sliding member 35 is installed between them. This collar part 34b
Small holes 34c are formed in the surfaces of the piston 34 on both sides, and an air vent pipe 34d is opened at the other end of the piston 34. Further, on the lower end surface of the piston 34, a mounting portion 34e that is attached to the mounting portion 8a of the main body 8 is provided.
is formed. The air vent pipe 34d is connected to an electromagnetic air valve 37 via an air hose 36. The maximum buffering force of the buffer body 17 configured in this way is the buffering force due to the frictional resistance between the sliding member 35 and the cylinder 30 when the air vent pipe 34d is closed, and the air compression force in the piston 34 and the piston. 34 and the combined force of the air compression force within the cylinder 30 becomes the maximum buffering force.

On the other hand, the minimum buffering force is the air vent pipe 3.
Sliding member 35 and cylinder 30 when 4d is opened
The minimum buffering force is the sum of the buffering force due to the frictional resistance of the piston 34 and the air compression force that is reduced by communicating the inside of the piston 34 and the cylinder 30 with the atmosphere.

In the above configuration, FIGS. 4(a) and (b)
) to explain the operation. As shown in the figure, when washing starts, a predetermined amount of water is supplied to the water tank 2 and heated by the heater 19 until it reaches a predetermined temperature. At this time, the drum 1 is driven to rotate at a low speed by the motor 3, and the clothes in the drum 1 are lifted up and dropped, and the mechanical force of the falling impact is applied to wash the clothes. When washing is completed, the washing water is drained and the washing process is completed.

Next, when the dewatering process begins, the drum 1 is driven to rotate at high speed by the motor 3 to perform centrifugal dewatering of the clothes. Then, for a predetermined period of time after the start of the dehydration operation, the control device 20
The electromagnetic air valve 37 is closed by a signal from the buffer 17, and the buffering force of the buffer body 17 is maximized. Thereby, it is possible to prevent the vibration amplitude of the water tank 2 from increasing when passing through the resonance point at the start of the dewatering operation.

[0023] In this way, when the dewatering operation reaches a steady state and a predetermined time has elapsed after the start of dehydration, the control device 20 opens the electromagnetic air valve 37 to reduce the buffering force of the buffer body 17. Thereby, vibrations of the water tank 2 after passing through the resonance point can be prevented from being transmitted to the washing machine main body and the floor surface via the buffer body 17.

When the dehydration is finished and the dehydration operation is stopped, the power supply to the motor 3 is stopped, and then the control device 2 is turned off for a predetermined period of time.
The electromagnetic air valve 37 is closed by the signal from 0, and the buffering force of the buffer body 17 is maximized. Thereby, it is possible to prevent the vibration amplitude of the water tank 2 from increasing when passing through the resonance point when the dewatering operation is stopped.

According to the first embodiment of the present invention, the buffering force of the buffer body 17 is increased during the predetermined time after the start of the dehydration operation and the predetermined time after the stop of the dehydration operation, and the buffering force is increased during the predetermined time after the dehydration operation is stopped. By changing the buffering force of the buffer body 17 to a small value over time, it is possible to increase the vibration amplitude of the water tank 2 and to prevent the vibrations of the water tank 2 from being transmitted to the floor surface.

Next, a second embodiment of the present invention is shown in FIGS. 5 and 6. As shown in FIG. 5, reference numeral 40 denotes a vibration detection device that is attached to the water tank 2 and detects the magnitude of vibration of the water tank 2 during dewatering operation.

In the above configuration, FIGS. 6(a) and (b)
) to explain the operation. During the spin-drying operation, the vibration detection device 40 detects the vibration of the water tank 2 exceeding a predetermined value, that is, the vibration amplitude of the water tank 2 is large when passing through a resonance point after the start of the spin-drying operation or when the unevenness of the clothes in the drum is large. When this is detected, the vibration detection device 40 sends a signal to the control device 20 to maximize the damping force of the damping body 17, similar to that shown in the first embodiment. This can prevent the vibrations of the water tank 14 from spreading.

Furthermore, when the vibration detection device 40 detects the vibration of the water tank 2 below a predetermined value, that is, when the spin-drying operation is steady and when the unevenness of the clothes in the drum is small,
The signal is sent to the control device 20, and the buffering force of the buffer body 17 is reduced as in the first embodiment. This can prevent the vibrations of the water tank from being transmitted to the washing machine main body and the floor surface via the buffer.

As described above, according to the second embodiment of the present invention, when the vibration detection device 40 detects vibrations exceeding a predetermined value, the damping force of the buffer body 17 is increased, and when vibrations below a predetermined value are detected, Then, by changing it to a small value, it is possible to prevent the vibrations of the water tank 2 from spreading and the vibrations of the water tank 2 from being transmitted to the floor surface.

Next, a third embodiment of the present invention is shown in FIGS. 7 and 8. As shown in FIG. 7, 41 is a rotation detection device that detects the rotation speed of the drum 1 during dehydration operation, and as an example,
The rotation speed of a motor 3 such as a tachogenerator is detected as an output voltage.

In the above configuration, FIGS. 8(a) and (b)
). When the rotation detection device 41 detects the rotation speed of the motor 3 below a predetermined value below the resonance point during the dehydration operation, the rotation detection device 41 sends a signal to the control device 20, and the rotation detection device 41 sends a signal to the control device 20, and the rotation detection device 41 sends a signal to the control device 20. Similarly, the buffering force of the buffer body 17 is maximized. Thereby, it is possible to prevent the vibration amplitude of the water tank 2 from increasing when passing through the resonance point at the start of the dewatering operation.

Further, when the rotation detecting device 41 detects the rotation speed of the motor 3 exceeding a predetermined value exceeding the resonance point,
The signal is sent to the control device 20, and the buffering force of the buffer body 17 is reduced as in the first embodiment. This can prevent the vibrations of the water tank from being transmitted to the washing machine main body and the floor surface via the buffer.

According to the third embodiment of the present invention, when the rotation detection device 41 detects a rotation speed below a predetermined value, the buffering force of the shock absorber 17 is increased so that the rotation speed exceeds a predetermined value. When it is detected, by changing it to a small value, it is possible to increase the vibration amplitude of the water tank 2 and to prevent the vibration of the water tank 2 from being transmitted to the floor surface.

Furthermore, due to the effects of each of the above embodiments, the water tank 2
It is possible to reduce the weight of the weight 18 disposed on the vibration body, which has the effect of reducing the weight of the vibrating body to about 30 kg.

[0035]

As is clear from the description of the above embodiments, according to the present invention, the first means reduces the buffering force of the buffer body for a predetermined time after the start of the dehydration operation and for a predetermined time after the stop of the dehydration operation. By increasing , it is possible to prevent the vibration amplitude of the water tank from increasing when passing through the resonance point after starting the dewatering operation and after stopping the dehydrating operation. Furthermore, by reducing the buffering force of the buffer during times other than the predetermined time, it is possible to prevent the vibrations of the water tank from being transmitted to the washing machine body and the floor via the buffer after passing the resonance point. .

In addition, by the second means, the vibration detection device detects vibrations exceeding a predetermined value during the spin-drying operation, that is, when passing through a resonance point after the start of the spin-drying operation, and when the unevenness of the clothes in the drum is large. By detecting that the vibration amplitude of the water tank is large and increasing the buffering force of the buffer body, it is possible to prevent the vibration of the water tank from spreading.

[0037] Furthermore, when the vibration detection device detects vibrations below a predetermined value, that is, when the dehydration operation is steady and when the unevenness of the clothes in the drum is small, the shock absorbing force of the shock absorber is reduced. It is possible to prevent the vibrations of the water tank from being transmitted to the washing machine main body and the floor surface via the buffer.

Further, according to the third means, when the rotation speed detection device detects the rotation speed of the drum below a predetermined value during dewatering operation, that is, the rotation speed below the resonance point, the buffering force of the buffer body is increased. By doing so, it is possible to prevent the vibration amplitude of the water tank from increasing when passing through the resonance point after the start of the dewatering operation. In addition, by reducing the buffering force of the buffer when the rotational speed of the drum exceeds a predetermined value exceeding the resonance point, the vibration of the water tank is transmitted through the buffer to the washing machine body and the floor after passing the resonance point. It is possible to prevent the information from being transmitted.

As described above, according to the present invention, it is possible to provide a drum-type washing machine that reduces the vibration of the drum during dehydration operation, reduces the vibration transmitted to the floor surface on which it is installed, and has less noise. .

[Brief explanation of the drawing]

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

[Figure 2] Side cross-sectional view of the shock absorber of the drum-type washing machine

[Figure 3
] Front sectional view of the same drum-type washing machine

FIG. 4 (a) Block diagram explaining the operation of the drum-type washing machine (b) Flowchart explaining the operation of the drum-type washing machine

FIG. 5 is a front sectional view of a drum-type washing machine according to a second embodiment of the present invention.

FIG. 6 (a) Block diagram explaining the operation of the drum-type washing machine; (b) Flowchart explaining the operation of the drum-type washing machine.

FIG. 7 is a front cross-sectional view of a drum-type washing machine according to a third embodiment of the present invention.

FIG. 8 (a) Block diagram explaining the operation of the drum-type washing machine; (b) Flowchart explaining the operation of the drum-type washing machine.

[Figure 9] Side sectional view of a conventional drum-type washing machine

[Explanation of symbols]

1 Drum 1a Water hole 2　Aquarium 3 Motor 4 Rotation axis 7 Spring body 17 Buffer 40 Vibration detection device 41 Rotation detection device

Claims (3)

[Claims] 1. A drum having a water passage hole on its outer periphery; a water tank that encloses the drum and stores washing water; a rotating shaft that rotatably supports the drum horizontally in the water tank; and the rotating shaft. , a spring body that suspends the water tank from the main body, and a buffer body that suppresses the rotational vibration of the water tank, and the buffer body has a variable buffering force, and has a spring body that suspends the water tank from the main body. A drum-type washing machine in which the buffering force of the buffer body is increased during a predetermined time after the start of the dehydration operation and a predetermined time after the stop of the dehydration operation, and decreased during times other than the predetermined time. 2. A drum having a water passage hole on its outer periphery; a water tank that encloses the drum and stores washing water; a rotating shaft that rotatably supports the drum horizontally in the water tank; A spring body that suspends the water tank from the main body, a buffer that suppresses vibrations of the water tank, and a vibration detection device that detects the magnitude of vibration of the water tank during dewatering operation. , the buffer body has a variable buffering force, and when the vibration detection device detects vibrations exceeding a predetermined value during dehydration operation, the buffering force of the buffer body is increased to suppress vibrations below the predetermined value. A drum-type washing machine that changes to a smaller size when it detects. 3. A drum having a water passage hole on its outer periphery, a water tank that encloses the drum and stores washing water, a rotating shaft that rotatably supports the drum horizontally in the water tank, and the rotating shaft. a spring body that suspends the water tank from the main body; and a rotation detection device that detects the number of rotations of the drum during dewatering operation, and the buffer body has a variable buffering force; During dewatering operation, when the rotation detecting device detects a rotation speed below a predetermined value, the buffering force of the buffer increases, and when it detects a rotation speed above a predetermined value, the damping force decreases. washing machine.